308 files changed, 37 insertions, 116221 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index aae3436ae..f7ebfe99e 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -21,30 +21,6 @@ add_subdirectory(libnest2d)
 include_directories(${LIBDIR}/qhull/src)
 #message(STATUS ${LIBDIR}/qhull/src)
 
-# ##############################################################################
-# Configure rasterizer target
-# ##############################################################################
-
-find_package(PNG QUIET)
-
-option(RASTERIZER_FORCE_BUILTIN_LIBPNG "Force the usage of builting libpng instead of the system version." OFF)
-
-if(PNG_FOUND AND NOT RASTERIZER_FORCE_BUILTIN_LIBPNG)
-    message(STATUS "Using system libpng.")
-else()
-    set(ZLIB_LIBRARY "")
-    message(WARNING "Using builtin libpng. This can cause crashes on some platforms.")
-    set(SKIP_INSTALL_ALL 1)   # Prevent png+zlib from creating install targets
-    add_subdirectory(png/zlib)
-    set(ZLIB_INCLUDE_DIR ${PROJECT_SOURCE_DIR}/png/zlib ${CMAKE_CURRENT_BINARY_DIR}/png/zlib)
-    include_directories(${ZLIB_INCLUDE_DIR})
-    add_subdirectory(png/libpng)
-    set_target_properties(zlibstatic PROPERTIES POSITION_INDEPENDENT_CODE ON)
-    set_target_properties(png_static PROPERTIES POSITION_INDEPENDENT_CODE ON)
-    set(PNG_LIBRARIES png_static zlibstatic)
-    set(PNG_INCLUDE_DIRS ${ZLIB_INCLUDE_DIR} ${PROJECT_SOURCE_DIR}/png/libpng ${CMAKE_CURRENT_BINARY_DIR}/png/libpng)
-endif()
-
 add_subdirectory(libslic3r)
 
 if (SLIC3R_GUI)
@@ -188,7 +164,7 @@ if (MSVC)
         )
     endif ()
 elseif (XCODE)
-    # Because of Debug/Release/etc. configurations (similar to MSVC) the slic3r binary is located in an extra level
+    # Because of Debug/Release/etc. configurations (similar to MSVC) the slic3r binary is located in an extra level
     add_custom_command(TARGET slic3r POST_BUILD
         COMMAND ln -sf "${SLIC3R_RESOURCES_DIR}" "${CMAKE_CURRENT_BINARY_DIR}/resources"
         COMMENT "Symlinking the resources directory into the build tree"
diff --git a/src/libslic3r/CMakeLists.txt b/src/libslic3r/CMakeLists.txt
index 2502c1b3e..3e0af50c2 100644
--- a/src/libslic3r/CMakeLists.txt
+++ b/src/libslic3r/CMakeLists.txt
@@ -177,8 +177,8 @@ if (SLIC3R_PCH AND NOT SLIC3R_SYNTAXONLY)
     add_precompiled_header(libslic3r pchheader.hpp FORCEINCLUDE)
 endif ()
 
-target_compile_definitions(libslic3r PUBLIC -DUSE_TBB ${PNG_DEFINITIONS})
-target_include_directories(libslic3r PRIVATE ${CMAKE_CURRENT_SOURCE_DIR} ${LIBNEST2D_INCLUDES} ${PNG_INCLUDE_DIRS} PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
+target_compile_definitions(libslic3r PUBLIC -DUSE_TBB)
+target_include_directories(libslic3r PRIVATE ${CMAKE_CURRENT_SOURCE_DIR} ${LIBNEST2D_INCLUDES} PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
 target_link_libraries(libslic3r
     libnest2d
     admesh
@@ -188,7 +188,6 @@ target_link_libraries(libslic3r
     nowide
     ${EXPAT_LIBRARIES}
     ${GLEW_LIBRARIES}
-    ${PNG_LIBRARIES}
     glu-libtess
     polypartition
     poly2tri
diff --git a/src/libslic3r/Rasterizer/Rasterizer.cpp b/src/libslic3r/Rasterizer/Rasterizer.cpp
index 5961d9b78..5ddf760a4 100644
--- a/src/libslic3r/Rasterizer/Rasterizer.cpp
+++ b/src/libslic3r/Rasterizer/Rasterizer.cpp
@@ -16,7 +16,10 @@
 #include <agg/agg_path_storage.h>
 
 // For png compression
-#include <png/writer.hpp>
+//#include <png/writer.hpp>
+
+// Experimental minz image write:
+#include <miniz/miniz_tdef.h>
 
 namespace Slic3r {
 
@@ -181,26 +184,42 @@ void Raster::save(std::ostream& stream, Compression comp)
     switch(comp) {
     case Compression::PNG: {
 
-        png::writer<std::ostream> wr(stream);
+//        png::writer<std::ostream> wr(stream);
+
+//        wr.set_bit_depth(8);
+//        wr.set_color_type(png::color_type_gray);
+//        wr.set_width(resolution().width_px);
+//        wr.set_height(resolution().height_px);
+//        wr.set_compression_type(png::compression_type_default);
+
+//        wr.write_info();
+
+//        auto& b = m_impl->buffer();
+//        auto ptr = reinterpret_cast<png::byte*>( b.data() );
+//        unsigned stride =
+//                sizeof(Impl::TBuffer::value_type) *  resolution().width_px;
 
-        wr.set_bit_depth(8);
-        wr.set_color_type(png::color_type_gray);
-        wr.set_width(resolution().width_px);
-        wr.set_height(resolution().height_px);
-        wr.set_compression_type(png::compression_type_default);
+//        for(unsigned r = 0; r < resolution().height_px; r++, ptr+=stride) {
+//            wr.write_row(ptr);
+//        }
 
-        wr.write_info();
+//        wr.write_end_info();
+
+        if(!stream.good()) break;
 
         auto& b = m_impl->buffer();
-        auto ptr = reinterpret_cast<png::byte*>( b.data() );
-        unsigned stride =
-                sizeof(Impl::TBuffer::value_type) *  resolution().width_px;
+        size_t out_len = 0;
+        void * rawdata = tdefl_write_image_to_png_file_in_memory(
+                    b.data(),
+                    int(resolution().width_px),
+                    int(resolution().height_px), 1, &out_len);
 
-        for(unsigned r = 0; r < resolution().height_px; r++, ptr+=stride) {
-            wr.write_row(ptr);
-        }
+        if(rawdata == nullptr) break;
+
+        stream.write(static_cast<const char*>(rawdata),
+                     std::streamsize(out_len));
 
-        wr.write_end_info();
+        MZ_FREE(rawdata);
 
         break;
     }
diff --git a/src/png/AUTHORS b/src/png/AUTHORS
deleted file mode 100644
index 25aad54dc..000000000
--- a/src/png/AUTHORS
+++ /dev/null
@@ -1,4 +0,0 @@
-png++ is written by Alexander Shulgin  (alex dot shulgin at gmail dot com)
-Copyright (C) 2007,2008
-
-When writing to me be sure to put png++: in the subject :-)
diff --git a/src/png/COPYING b/src/png/COPYING
deleted file mode 100644
index 04889ba11..000000000
--- a/src/png/COPYING
+++ /dev/null
@@ -1,25 +0,0 @@
-Copying png++ is subject to the following license:
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-   1. Redistributions of source code must retain the above copyright notice,
-      this list of conditions and the following disclaimer.
-
-   2. Redistributions in binary form must reproduce the above copyright
-      notice, this list of conditions and the following disclaimer in the
-      documentation and/or other materials provided with the distribution.
-
-   3. The name of the author may not be used to endorse or promote products
-      derived from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
-WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
-EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
-BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
-IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.
diff --git a/src/png/NEWS b/src/png/NEWS
deleted file mode 100644
index cc006fbf5..000000000
--- a/src/png/NEWS
+++ /dev/null
@@ -1,60 +0,0 @@
-Version 0.2.7:
-
-  - Added solid_pixel_buffer (patch by Andrey Potapov).
-
-  - Fixed some compilation problems on Win32.
-
-Version 0.2.5:
-
-  - Fixed compatibility with newer libpng versions (>= 1.4)
-
-  - Fixed compilation on FreeBSD.
-
-  - Fixed tRNS handling with transformations.
-
-  - Added IO transformation debugging facility.
-
-  - Better organized test suite.
-
-Version 0.2.3:
-
-  - Fixed numerous `already defined' errors due to require_color_space
-    implementation.
-
-  - Added `config.hpp'.
-
-  - Fixed `strerror' usage.
-
-  - Minor docs fixes.
-
-
-Version 0.2.1:
-
-  - Added support for tRNS chunk.
-
-  - Added non-std IO streams support.
-
-  - Fixed 16-bit endianness problems.
-
-  - Improved test script.
-
-
-Version 0.2.0:
-
-  - Added support for 16-bit data (RGB, RGBA, Grayscale and Gray+Alpha
-    color types)
-
-  - Added support for packed 1-, 2- or 4-bit pixels (Grayscale and
-    Indexed colors)
-
-  - Fixed interlace handling code which was severely broken
-
-  - Added possibility to process images without reading the entire
-    image into memory
-
-  - Internals are refactored while the client interface is mostly
-    unchanged
-
-  - Added intensive test suite
-
-  - Added documentation
diff --git a/src/png/color.hpp b/src/png/color.hpp
deleted file mode 100644
index b5ffde2c4..000000000
--- a/src/png/color.hpp
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
- * Copyright (C) 2007,2008   Alex Shulgin
- *
- * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
- * software; the exact copying conditions are as follows:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef PNGPP_COLOR_HPP_INCLUDED
-#define PNGPP_COLOR_HPP_INCLUDED
-
-#include "types.hpp"
-
-namespace png
-{
-
-    /**
-     * \brief PNG color struct extension.  Adds constructors. 
-     */
-    struct color
-        : png_color
-    {
-        explicit color(byte r = 0, byte g = 0, byte b = 0)
-        {
-            this->red = r;
-            this->green = g;
-            this->blue = b;
-        }
-
-        /**
-         * \brief Initializes color with a copy of png_color object.
-         */
-        color(png_color const& other)
-        {
-            this->red = other.red;
-            this->green = other.green;
-            this->blue = other.blue;
-        }
-    };
-
-} // namespace png
-
-#endif // PNGPP_COLOR_HPP_INCLUDED
diff --git a/src/png/end_info.hpp b/src/png/end_info.hpp
deleted file mode 100644
index 09590596d..000000000
--- a/src/png/end_info.hpp
+++ /dev/null
@@ -1,74 +0,0 @@
-/*
- * Copyright (C) 2007,2008   Alex Shulgin
- *
- * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
- * software; the exact copying conditions are as follows:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef PNGPP_END_INFO_HPP_INCLUDED
-#define PNGPP_END_INFO_HPP_INCLUDED
-
-#include "info_base.hpp"
-
-namespace png
-{
-
-    /**
-     * \brief Internal class to hold PNG ending %info.
-     *
-     * \see info, info_base
-     */
-    class end_info
-        : public info_base
-    {
-    public:
-        end_info(io_base& io, png_struct* png)
-            : info_base(io, png)
-        {
-        }
-
-        void destroy()
-        {
-            assert(m_info);
-            png_destroy_info_struct(m_png, & m_info);
-        }
-
-        void read()
-        {
-            png_read_end(m_png, m_info);
-        }
-        
-        void write() const
-        {
-            png_write_end(m_png, m_info);
-        }
-
-        // TODO: add methods to read/write text comments etc.
-    };
-
-} // namespace png
-
-#endif // PNGPP_END_INFO_HPP_INCLUDED
diff --git a/src/png/error.hpp b/src/png/error.hpp
deleted file mode 100644
index c67f97630..000000000
--- a/src/png/error.hpp
+++ /dev/null
@@ -1,125 +0,0 @@
-/*
- * Copyright (C) 2007,2008   Alex Shulgin
- *
- * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
- * software; the exact copying conditions are as follows:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef PNGPP_ERROR_HPP_INCLUDED
-#define PNGPP_ERROR_HPP_INCLUDED
-
-/* check if we have strerror_s or strerror_r, prefer the former which is C11 std */
-#ifdef __STDC_LIB_EXT1__
-#define __STDC_WANT_LIB_EXT1__ 1
-#include <string.h>
-
-#define HAVE_STRERROR_S 1
-#else
-#undef  HAVE_STRERROR_S
-#endif
-
-#include <string>
-#include <stdexcept>
-#include <cerrno>
-#include <cstdlib>
-#include <cstring>
-
-namespace png
-{
-
-    /**
-     * \brief Exception class to represent runtime errors related to
-     * png++ operation.
-     */
-    class error
-        : public std::runtime_error
-    {
-    public:
-        /**
-         * \param  message  error description
-         */
-        explicit error(std::string const& message)
-            : std::runtime_error(message)
-        {
-        }
-    };
-
-    /**
-     * \brief Exception class to represent standard library errors
-     * (generally IO).
-     *
-     * \see  reader, writer
-     */
-    class std_error
-        : public std::runtime_error
-    {
-    public:
-        /**
-         * Constructs an std_error object.  The \a message string is
-         * appended with <tt>": "</tt> and the error description as
-         * returned by \c strerror(\a error).
-         *
-         * \param  message  error description
-         * \param  error    error number
-         */
-        explicit std_error(std::string const& message, int errnum = errno)
-            : std::runtime_error((message + ": ") + thread_safe_strerror(errnum))
-        {
-        }
-
-    protected:
-        static std::string thread_safe_strerror(int errnum)
-        {
-#define ERRBUF_SIZE 512
-
-#ifdef HAVE_STRERROR_S
-            char buf[ERRBUF_SIZE] = { 0 };
-            strerror_s(buf, ERRBUF_SIZE, errnum);
-            return std::string(buf);
-#else
-#if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE
-            char buf[ERRBUF_SIZE] = { 0 };
-            strerror_r(errnum, buf, ERRBUF_SIZE);
-            return std::string(buf);
-#elif _GNU_SOURCE
-            /* GNU variant can return a pointer to static buffer instead of buf */
-            char buf[ERRBUF_SIZE] = { 0 };
-            return std::string(strerror_r(errnum, buf, ERRBUF_SIZE));
-#else
-            return std::string("An error occured with errnum ") +
-                    std::to_string(errnum) +
-                    ". Converting to the appropriate error message is disabled"
-                    "in this instance of the png++ library.";
-#endif
-#endif
-
-#undef ERRBUF_SIZE
-        }
-    };
-
-} // namespace png
-
-#endif // PNGPP_ERROR_HPP_INCLUDED
diff --git a/src/png/image_info.hpp b/src/png/image_info.hpp
deleted file mode 100644
index 8407bc18b..000000000
--- a/src/png/image_info.hpp
+++ /dev/null
@@ -1,215 +0,0 @@
-/*
- * Copyright (C) 2007,2008   Alex Shulgin
- *
- * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
- * software; the exact copying conditions are as follows:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef PNGPP_IMAGE_INFO_HPP_INCLUDED
-#define PNGPP_IMAGE_INFO_HPP_INCLUDED
-
-#include "types.hpp"
-#include "palette.hpp"
-#include "tRNS.hpp"
-#include "pixel_traits.hpp"
-
-namespace png
-{
-
-    /**
-     * \brief Holds information about PNG image.
-     *
-     * \see image, generator, consumer
-     */
-    class image_info
-    {
-    public:
-        /**
-         * \brief Constructs the image_info object with default values
-         * for color_type, interlace_type, compression_method and
-         * filter_type.
-         */
-        image_info()
-            : m_width(0),
-              m_height(0),
-              m_bit_depth(0),
-              m_color_type(color_type_none),
-              m_interlace_type(interlace_none),
-              m_compression_type(compression_type_default),
-              m_filter_type(filter_type_default),
-              m_gamma(0.0)
-        {
-        }
-
-        uint_32 get_width() const
-        {
-            return m_width;
-        }
-
-        void set_width(uint_32 width)
-        {
-            m_width = width;
-        }
-
-        uint_32 get_height() const
-        {
-            return m_height;
-        }
-
-        void set_height(uint_32 height)
-        {
-            m_height = height;
-        }
-
-        color_type get_color_type() const
-        {
-            return m_color_type;
-        }
-
-        void set_color_type(color_type color_space)
-        {
-            m_color_type = color_space;
-        }
-
-        int get_bit_depth() const
-        {
-            return m_bit_depth;
-        }
-
-        void set_bit_depth(int bit_depth)
-        {
-            m_bit_depth = bit_depth;
-        }
-
-        interlace_type get_interlace_type() const
-        {
-            return m_interlace_type;
-        }
-
-        void set_interlace_type(interlace_type interlace)
-        {
-            m_interlace_type = interlace;
-        }
-
-        compression_type get_compression_type() const
-        {
-            return m_compression_type;
-        }
-
-        void set_compression_type(compression_type compression)
-        {
-            m_compression_type = compression;
-        }
-
-        filter_type get_filter_type() const
-        {
-            return m_filter_type;
-        }
-
-        void set_filter_type(filter_type filter)
-        {
-            m_filter_type = filter;
-        }
-
-        palette const& get_palette() const
-        {
-            return m_palette;
-        }
-
-        palette& get_palette()
-        {
-            return m_palette;
-        }
-
-        void set_palette(palette const& plte)
-        {
-            m_palette = plte;
-        }
-
-        /**
-         * \brief Removes all entries from the palette.
-         */
-        void drop_palette()
-        {
-            m_palette.clear();
-        }
-
-        tRNS const& get_tRNS() const
-        {
-            return m_tRNS;
-        }
-
-        tRNS& get_tRNS()
-        {
-            return m_tRNS;
-        }
-
-        void set_tRNS(tRNS const& trns)
-        {
-            m_tRNS = trns;
-        }
-
-        double get_gamma() const
-        {
-            return m_gamma;
-        }
-
-        void set_gamma(double gamma)
-        {
-            m_gamma = gamma;
-        }
-
-    protected:
-        uint_32 m_width;
-        uint_32 m_height;
-        int m_bit_depth;
-        color_type m_color_type;
-        interlace_type m_interlace_type;
-        compression_type m_compression_type;
-        filter_type m_filter_type;
-        palette m_palette;
-        tRNS m_tRNS;
-        double m_gamma;
-    };
-
-    /**
-     * \brief Returns an image_info object with color_type and
-     * bit_depth fields setup appropriate for the \c pixel type.
-     */
-    template< typename pixel >
-    image_info
-    make_image_info()
-    {
-        typedef pixel_traits< pixel > traits;
-        image_info info;
-        info.set_color_type(traits::get_color_type());
-        info.set_bit_depth(traits::get_bit_depth());
-        return info;
-    }
-
-} // namespace png
-
-#endif // PNGPP_IMAGE_INFO_HPP_INCLUDED
diff --git a/src/png/info.hpp b/src/png/info.hpp
deleted file mode 100644
index 3f3cf09c3..000000000
--- a/src/png/info.hpp
+++ /dev/null
@@ -1,186 +0,0 @@
-/*
- * Copyright (C) 2007,2008   Alex Shulgin
- *
- * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
- * software; the exact copying conditions are as follows:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef PNGPP_INFO_HPP_INCLUDED
-#define PNGPP_INFO_HPP_INCLUDED
-
-#include <cassert>
-#include "info_base.hpp"
-#include "image_info.hpp"
-
-namespace png
-{
-
-    /**
-     * \brief Holds information about PNG image.  Adapter class for IO
-     * image operations.
-     */
-    class info
-        : public info_base,
-          public image_info
-    {
-    public:
-        info(io_base& io, png_struct* png)
-            : info_base(io, png)
-        {
-        }
-
-        void read()
-        {
-            assert(m_png);
-            assert(m_info);
-
-            png_read_info(m_png, m_info);
-            png_get_IHDR(m_png,
-                         m_info,
-                         & m_width,
-                         & m_height,
-                         reinterpret_cast< int* >(& m_bit_depth),
-                         reinterpret_cast< int* >(& m_color_type),
-                         reinterpret_cast< int* >(& m_interlace_type),
-                         reinterpret_cast< int* >(& m_compression_type),
-                         reinterpret_cast< int* >(& m_filter_type));
-
-            if (png_get_valid(m_png, m_info, chunk_PLTE) == chunk_PLTE)
-            {
-                png_color* colors = 0;
-                int count = 0;
-                png_get_PLTE(m_png, m_info, & colors, & count);
-                m_palette.assign(colors, colors + count);
-            }
-
-#ifdef PNG_tRNS_SUPPORTED
-            if (png_get_valid(m_png, m_info, chunk_tRNS) == chunk_tRNS)
-            {
-                if (m_color_type == color_type_palette)
-                {
-                    int count;
-                    byte* values;
-                    if (png_get_tRNS(m_png, m_info, & values, & count, NULL)
-                        != PNG_INFO_tRNS)
-                    {
-                        throw error("png_get_tRNS() failed");
-                    }
-                    m_tRNS.assign(values, values + count);
-                }
-            }
-#endif
-
-#ifdef PNG_gAMA_SUPPORTED
-            if (png_get_valid(m_png, m_info, chunk_gAMA) == chunk_gAMA)
-            {
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-                if (png_get_gAMA(m_png, m_info, &m_gamma) != PNG_INFO_gAMA)
-                {
-                    throw error("png_get_gAMA() failed");
-                }
-#else
-                png_fixed_point gamma = 0;
-                if (png_get_gAMA_fixed(m_png, m_info, &gamma) != PNG_INFO_gAMA)
-                {
-                    throw error("png_get_gAMA_fixed() failed");
-                }
-                m_gamma = gamma / 100000.0;
-#endif
-            }
-#endif
-        }
-
-        void write() const
-        {
-            assert(m_png);
-            assert(m_info);
-
-            sync_ihdr();
-            if (m_color_type == color_type_palette)
-            {
-                if (! m_palette.empty())
-                {
-                    png_set_PLTE(m_png, m_info,
-                                 const_cast< color* >(& m_palette[0]),
-                                 (int) m_palette.size());
-                }
-                if (! m_tRNS.empty())
-                {
-#ifdef PNG_tRNS_SUPPORTED
-                    png_set_tRNS(m_png, m_info,
-                                 const_cast< byte* >(& m_tRNS[0]),
-                                 m_tRNS.size(),
-                                 NULL);
-#else
-                    throw error("attempted to write tRNS chunk; recompile with PNG_tRNS_SUPPORTED");
-#endif
-                }
-            }
-
-            if (m_gamma > 0)
-            {
-#ifdef PNG_gAMA_SUPPORTED
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-                png_set_gAMA(m_png, m_info, m_gamma);
-#else
-                png_set_gAMA_fixed(m_png, m_info,
-                                   (png_fixed_point)(m_gamma * 100000));
-#endif
-#else
-                throw error("attempted to write gAMA chunk; recompile with PNG_gAMA_SUPPORTED");
-#endif
-            }
-
-            png_write_info(m_png, m_info);
-        }
-
-        void update()
-        {
-            assert(m_png);
-            assert(m_info);
-
-            sync_ihdr();
-            png_read_update_info(m_png, m_info);
-        }
-
-    protected:
-        void sync_ihdr(void) const
-        {
-            png_set_IHDR(m_png,
-                         m_info,
-                         m_width,
-                         m_height,
-                         m_bit_depth,
-                         m_color_type,
-                         m_interlace_type,
-                         m_compression_type,
-                         m_filter_type);
-        }
-    };
-
-} // namespace png
-
-#endif // PNGPP_INFO_HPP_INCLUDED
diff --git a/src/png/info_base.hpp b/src/png/info_base.hpp
deleted file mode 100644
index 45e154296..000000000
--- a/src/png/info_base.hpp
+++ /dev/null
@@ -1,77 +0,0 @@
-/*
- * Copyright (C) 2007,2008   Alex Shulgin
- *
- * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
- * software; the exact copying conditions are as follows:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef PNGPP_INFO_BASE_HPP_INCLUDED
-#define PNGPP_INFO_BASE_HPP_INCLUDED
-
-#include <cassert>
-#include "error.hpp"
-#include "types.hpp"
-
-namespace png
-{
-
-    class io_base;
-
-    /**
-     * \brief Internal class to hold PNG info or end_info.
-     */
-    class info_base
-    {
-        info_base(info_base const&);
-        info_base& operator=(info_base const&);
-
-    public:
-        info_base(io_base& io, png_struct* png)
-            : m_io(io),
-              m_png(png),
-              m_info(png_create_info_struct(m_png))
-        {
-        }
-
-        png_info* get_png_info() const
-        {
-            return m_info;
-        }
-
-        png_info** get_png_info_ptr()
-        {
-            return & m_info;
-        }
-
-    protected:
-        io_base& m_io;
-        png_struct* m_png;
-        png_info* m_info;
-    };
-
-} // namespace png
-
-#endif // PNGPP_INFO_BASE_HPP_INCLUDED
diff --git a/src/png/io_base.hpp b/src/png/io_base.hpp
deleted file mode 100644
index 3c2d83043..000000000
--- a/src/png/io_base.hpp
+++ /dev/null
@@ -1,467 +0,0 @@
-/*
- * Copyright (C) 2007,2008   Alex Shulgin
- *
- * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
- * software; the exact copying conditions are as follows:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef PNGPP_IO_BASE_HPP_INCLUDED
-#define PNGPP_IO_BASE_HPP_INCLUDED
-
-#include <cassert>
-#include <cstdio>
-#include <cstdarg>
-#include "error.hpp"
-#include "info.hpp"
-#include "end_info.hpp"
-
-static void
-trace_io_transform(char const* fmt, ...)
-{
-#ifdef DEBUG_IO_TRANSFORM
-    va_list va;
-    va_start(va, fmt);
-    fprintf(stderr, "TRANSFORM_IO: ");
-    vfprintf(stderr, fmt, va);
-    va_end(va);
-#endif
-}
-#define TRACE_IO_TRANSFORM trace_io_transform
-
-namespace png
-{
-
-    /**
-     * \brief Base class for PNG reader/writer classes.
-     *
-     * \see  reader, writer
-     */
-    class io_base
-    {
-        io_base(io_base const&);
-        io_base& operator=(io_base const&);
-
-    public:
-        explicit io_base(png_struct* png)
-            : m_png(png),
-              m_info(*this, m_png),
-              m_end_info(*this, m_png)
-        {
-        }
-
-        ~io_base()
-        {
-            assert(! m_png);
-            assert(! m_info.get_png_info());
-            assert(! m_end_info.get_png_info());
-        }
-
-        png_struct* get_png_struct() const
-        {
-            return m_png;
-        }
-
-        info& get_info()
-        {
-            return m_info;
-        }
-
-        info const& get_info() const
-        {
-            return m_info;
-        }
-
-        image_info const& get_image_info() const
-        {
-            return m_info;
-        }
-
-        void set_image_info(image_info const& info)
-        {
-            static_cast< image_info& >(m_info) = info; // slice it
-        }
-
-        end_info& get_end_info()
-        {
-            return m_end_info;
-        }
-
-        end_info const& get_end_info() const
-        {
-            return m_end_info;
-        }
-
-        //////////////////////////////////////////////////////////////////////
-        // info accessors
-        //
-        uint_32 get_width() const
-        {
-            return m_info.get_width();
-        }
-
-        void set_width(uint_32 width)
-        {
-            m_info.set_width(width);
-        }
-
-        uint_32 get_height() const
-        {
-            return m_info.get_height();
-        }
-
-        void set_height(uint_32 height)
-        {
-            m_info.set_height(height);
-        }
-
-        color_type get_color_type() const
-        {
-            return m_info.get_color_type();
-        }
-
-        void set_color_type(color_type color_space)
-        {
-            m_info.set_color_type(color_space);
-        }
-
-        int get_bit_depth() const
-        {
-            return m_info.get_bit_depth();
-        }
-
-        void set_bit_depth(int bit_depth)
-        {
-            m_info.set_bit_depth(bit_depth);
-        }
-
-        interlace_type get_interlace_type() const
-        {
-            return m_info.get_interlace_type();
-        }
-
-        void set_interlace_type(interlace_type interlace)
-        {
-            m_info.set_interlace_type(interlace);
-        }
-
-        compression_type get_compression_type() const
-        {
-            return m_info.get_compression_type();
-        }
-
-        void set_compression_type(compression_type compression)
-        {
-            m_info.set_compression_type(compression);
-        }
-
-        filter_type get_filter_type() const
-        {
-            return m_info.get_filter_type();
-        }
-
-        void set_filter_type(filter_type filter)
-        {
-            m_info.set_filter_type(filter);
-        }
-
-        //////////////////////////////////////////////////////////////////////
-
-        bool has_chunk(chunk id)
-        {
-            return png_get_valid(m_png,
-                                 m_info.get_png_info(),
-                                 uint_32(id)) == uint_32(id);
-        }
-
-#if defined(PNG_READ_EXPAND_SUPPORTED)
-        void set_gray_1_2_4_to_8() const
-        {
-            TRACE_IO_TRANSFORM("png_set_expand_gray_1_2_4_to_8\n");
-            png_set_expand_gray_1_2_4_to_8(m_png);
-        }
-
-        void set_palette_to_rgb() const
-        {
-            TRACE_IO_TRANSFORM("png_set_palette_to_rgb\n");
-            png_set_palette_to_rgb(m_png);
-        }
-
-        void set_tRNS_to_alpha() const
-        {
-            TRACE_IO_TRANSFORM("png_set_tRNS_to_alpha\n");
-            png_set_tRNS_to_alpha(m_png);
-        }
-#endif // defined(PNG_READ_EXPAND_SUPPORTED)
-
-#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-        void set_bgr() const
-        {
-            TRACE_IO_TRANSFORM("png_set_bgr\n");
-            png_set_bgr(m_png);
-        }
-#endif
-
-#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
-        void set_gray_to_rgb() const
-        {
-            TRACE_IO_TRANSFORM("png_set_gray_to_rgb\n");
-            png_set_gray_to_rgb(m_png);
-        }
-#endif
-
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-        void set_rgb_to_gray(rgb_to_gray_error_action error_action
-                             = rgb_to_gray_silent,
-                             double red_weight   = -1.0,
-                             double green_weight = -1.0) const
-        {
-            TRACE_IO_TRANSFORM("png_set_rgb_to_gray: error_action=%d,"
-                               " red_weight=%lf, green_weight=%lf\n",
-                               error_action, red_weight, green_weight);
-
-            png_set_rgb_to_gray(m_png, error_action, red_weight, green_weight);
-        }
-#else
-        void set_rgb_to_gray(rgb_to_gray_error_action error_action
-                             = rgb_to_gray_silent,
-                             fixed_point red_weight   = -1,
-                             fixed_point green_weight = -1) const
-        {
-            TRACE_IO_TRANSFORM("png_set_rgb_to_gray_fixed: error_action=%d,"
-                               " red_weight=%d, green_weight=%d\n",
-                               error_action, red_weight, green_weight);
-
-            png_set_rgb_to_gray_fixed(m_png, error_action,
-                                      red_weight, green_weight);
-        }
-#endif // PNG_FLOATING_POINT_SUPPORTED
-
-        //////////////////////////////////////////////////////////////////////
-        // alpha channel transformations
-        //
-#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-        void set_strip_alpha() const
-        {
-            TRACE_IO_TRANSFORM("png_set_strip_alpha\n");
-            png_set_strip_alpha(m_png);
-        }
-#endif
-
-#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) \
-    || defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-        void set_swap_alpha() const
-        {
-            TRACE_IO_TRANSFORM("png_set_swap_alpha\n");
-            png_set_swap_alpha(m_png);
-        }
-#endif
-
-#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) \
-    || defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-        void set_invert_alpha() const
-        {
-            TRACE_IO_TRANSFORM("png_set_invert_alpha\n");
-            png_set_invert_alpha(m_png);
-        }
-#endif
-
-#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
-        void set_filler(uint_32 filler, filler_type type) const
-        {
-            TRACE_IO_TRANSFORM("png_set_filler: filler=%08x, type=%d\n",
-                               filler, type);
-
-            png_set_filler(m_png, filler, type);
-        }
-
-#if !defined(PNG_1_0_X)
-        void set_add_alpha(uint_32 filler, filler_type type) const
-        {
-            TRACE_IO_TRANSFORM("png_set_add_alpha: filler=%08x, type=%d\n",
-                               filler, type);
-
-            png_set_add_alpha(m_png, filler, type);
-        }
-#endif
-#endif // PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED
-
-#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
-        void set_swap() const
-        {
-            TRACE_IO_TRANSFORM("png_set_swap\n");
-            png_set_swap(m_png);
-        }
-#endif
-
-#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
-        void set_packing() const
-        {
-            TRACE_IO_TRANSFORM("png_set_packing\n");
-            png_set_packing(m_png);
-        }
-#endif
-
-#if defined(PNG_READ_PACKSWAP_SUPPORTED) \
-    || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-        void set_packswap() const
-        {
-            TRACE_IO_TRANSFORM("png_set_packswap\n");
-            png_set_packswap(m_png);
-        }
-#endif
-
-#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
-        void set_shift(byte red_bits, byte green_bits, byte blue_bits,
-                       byte alpha_bits = 0) const
-        {
-            TRACE_IO_TRANSFORM("png_set_shift: red_bits=%d, green_bits=%d,"
-                               " blue_bits=%d, alpha_bits=%d\n",
-                               red_bits, green_bits, blue_bits, alpha_bits);
-
-            if (get_color_type() != color_type_rgb
-                || get_color_type() != color_type_rgb_alpha)
-            {
-                throw error("set_shift: expected RGB or RGBA color type");
-            }
-            color_info bits;
-            bits.red = red_bits;
-            bits.green = green_bits;
-            bits.blue = blue_bits;
-            bits.alpha = alpha_bits;
-            png_set_shift(m_png, & bits);
-        }
-
-        void set_shift(byte gray_bits, byte alpha_bits = 0) const
-        {
-            TRACE_IO_TRANSFORM("png_set_shift: gray_bits=%d, alpha_bits=%d\n",
-                               gray_bits, alpha_bits);
-
-            if (get_color_type() != color_type_gray
-                || get_color_type() != color_type_gray_alpha)
-            {
-                throw error("set_shift: expected Gray or Gray+Alpha color type");
-            }
-            color_info bits;
-            bits.gray = gray_bits;
-            bits.alpha = alpha_bits;
-            png_set_shift(m_png, & bits);
-        }
-#endif // PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED
-
-#if defined(PNG_READ_INTERLACING_SUPPORTED) \
-    || defined(PNG_WRITE_INTERLACING_SUPPORTED)
-        int set_interlace_handling() const
-        {
-            TRACE_IO_TRANSFORM("png_set_interlace_handling\n");
-            return png_set_interlace_handling(m_png);
-        }
-#endif
-
-#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
-        void set_invert_mono() const
-        {
-            TRACE_IO_TRANSFORM("png_set_invert_mono\n");
-            png_set_invert_mono(m_png);
-        }
-#endif
-
-#if defined(PNG_READ_16_TO_8_SUPPORTED)
-        void set_strip_16() const
-        {
-            TRACE_IO_TRANSFORM("png_set_strip_16\n");
-            png_set_strip_16(m_png);
-        }
-#endif
-
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
-        void set_read_user_transform(png_user_transform_ptr transform_fn)
-        {
-            TRACE_IO_TRANSFORM("png_set_read_user_transform_fn\n");
-            png_set_read_user_transform_fn(m_png, transform_fn);
-        }
-#endif
-
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) \
-    || defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-        void set_user_transform_info(void* info, int bit_depth, int channels)
-        {
-            TRACE_IO_TRANSFORM("png_set_user_transform_info: bit_depth=%d,"
-                               " channels=%d\n", bit_depth, channels);
-
-            png_set_user_transform_info(m_png, info, bit_depth, channels);
-        }
-#endif
-
-    protected:
-        void* get_io_ptr() const
-        {
-            return png_get_io_ptr(m_png);
-        }
-
-        void set_error(char const* message)
-        {
-            assert(message);
-            m_error = message;
-        }
-
-        void reset_error()
-        {
-            m_error.clear();
-        }
-
-/*
-        std::string const& get_error() const
-        {
-            return m_error;
-        }
-*/
-
-        bool is_error() const
-        {
-            return !m_error.empty();
-        }
-
-        void raise_error()
-        {
-            longjmp(png_jmpbuf(m_png), -1);
-        }
-
-        static void raise_error(png_struct* png, char const* message)
-        {
-            io_base* io = static_cast< io_base* >(png_get_error_ptr(png));
-            io->set_error(message);
-            io->raise_error();
-        }
-
-        png_struct* m_png;
-        info m_info;
-        end_info m_end_info;
-        std::string m_error;
-    };
-
-} // namespace png
-
-#endif // PNGPP_IO_BASE_HPP_INCLUDED
diff --git a/src/png/libpng/ANNOUNCE b/src/png/libpng/ANNOUNCE
deleted file mode 100644
index 0f66c0d1d..000000000
--- a/src/png/libpng/ANNOUNCE
+++ /dev/null
@@ -1,35 +0,0 @@
-Libpng 1.6.34 - September 29, 2017
-
-This is a public release of libpng, intended for use in production codes.
-
-Files available for download:
-
-Source files with LF line endings (for Unix/Linux) and with a
-"configure" script
-
-   libpng-1.6.34.tar.xz (LZMA-compressed, recommended)
-   libpng-1.6.34.tar.gz
-
-Source files with CRLF line endings (for Windows), without the
-"configure" script
-
-   lpng1634.7z  (LZMA-compressed, recommended)
-   lpng1634.zip
-
-Other information:
-
-   libpng-1.6.34-README.txt
-   libpng-1.6.34-LICENSE.txt
-   libpng-1.6.34-*.asc (armored detached GPG signatures)
-
-Changes since the last public release (1.6.33):
-  Removed contrib/pngsuite/i*.png; some of these were incorrect and caused
-    test failures.
-
-Send comments/corrections/commendations to png-mng-implement at lists.sf.net
-(subscription required; visit
-https://lists.sourceforge.net/lists/listinfo/png-mng-implement
-to subscribe)
-or to glennrp at users.sourceforge.net
-
-Glenn R-P
diff --git a/src/png/libpng/CMakeLists.txt b/src/png/libpng/CMakeLists.txt
deleted file mode 100644
index 7697110c7..000000000
--- a/src/png/libpng/CMakeLists.txt
+++ /dev/null
@@ -1,937 +0,0 @@
-# CMakeLists.txt
-
-# Copyright (C) 2007,2009-2017 Glenn Randers-Pehrson
-# Written by Christian Ehrlicher, 2007
-# Revised by Roger Lowman, 2009-2010
-# Revised by Clifford Yapp, 2011-2012
-# Revised by Roger Leigh, 2016
-# Revised by Andreas Franek, 2016
-
-# This code is released under the libpng license.
-# For conditions of distribution and use, see the disclaimer
-# and license in png.h
-
-cmake_minimum_required(VERSION 3.0.2)
-cmake_policy(VERSION 3.0.2)
-
-# Set MacOSX @rpath usage globally.
-if (POLICY CMP0020)
-  cmake_policy(SET CMP0020 NEW)
-endif(POLICY CMP0020)
-if (POLICY CMP0042)
-  cmake_policy(SET CMP0042 NEW)
-endif(POLICY CMP0042)
-# Use new variable expansion policy.
-if (POLICY CMP0053)
-  cmake_policy(SET CMP0053 NEW)
-endif(POLICY CMP0053)
-if (POLICY CMP0054)
-  cmake_policy(SET CMP0054 NEW)
-endif(POLICY CMP0054)
-
-set(CMAKE_CONFIGURATION_TYPES "Release;Debug;MinSizeRel;RelWithDebInfo")
-
-project(libpng ASM C)
-
-set(PNGLIB_MAJOR 1)
-set(PNGLIB_MINOR 6)
-set(PNGLIB_RELEASE 34)
-set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
-set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})
-
-# needed packages
-
-#Allow users to specify location of Zlib,
-# Useful if zlib is being built alongside this as a sub-project
-
-set(PNG_BUILD_ZLIB ${CMAKE_CURRENT_SOURCE_DIR}/zlib)
-
-if(NOT WIN32)
-  find_library(M_LIBRARY
-    NAMES m
-    PATHS /usr/lib /usr/local/lib
-  )
-  if(NOT M_LIBRARY)
-    message(STATUS "math lib 'libm' not found; floating point support disabled")
-  endif()
-else()
-  # not needed on windows
-  set(M_LIBRARY "")
-endif()
-
-# COMMAND LINE OPTIONS
-option(PNG_SHARED "Build shared lib" OFF)
-option(PNG_STATIC "Build static lib" ON)
-option(PNG_TESTS  "Build libpng tests" OFF)
-
-# Many more configuration options could be added here
-option(PNG_FRAMEWORK "Build OS X framework" OFF)
-option(PNG_DEBUG     "Build with debug output" OFF)
-option(PNGARG        "Disable ANSI-C prototypes" OFF)
-
-option(PNG_HARDWARE_OPTIMIZATIONS "Enable Hardware Optimizations" ON)
-
-set(PNG_PREFIX "" CACHE STRING "Prefix to add to the API function names")
-set(DFA_XTRA "" CACHE FILEPATH "File containing extra configuration settings")
-
-if(PNG_HARDWARE_OPTIMIZATIONS)
-# set definitions and sources for arm
-if(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm" OR
-  CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch64")
-  set(PNG_ARM_NEON_POSSIBLE_VALUES check on off)
-  set(PNG_ARM_NEON "check" CACHE STRING "Enable ARM NEON optimizations:
-     check: (default) use internal checking code;
-     off: disable the optimizations;
-     on: turn on unconditionally.")
-  set_property(CACHE PNG_ARM_NEON PROPERTY STRINGS
-     ${PNG_ARM_NEON_POSSIBLE_VALUES})
-  list(FIND PNG_ARM_NEON_POSSIBLE_VALUES ${PNG_ARM_NEON} index)
-  if(index EQUAL -1)
-    message(FATAL_ERROR
-      " PNG_ARM_NEON must be one of [${PNG_ARM_NEON_POSSIBLE_VALUES}]")
-  elseif(NOT ${PNG_ARM_NEON} STREQUAL "no")
-    set(libpng_arm_sources
-      arm/arm_init.c
-      arm/filter_neon.S
-      arm/filter_neon_intrinsics.c)
-
-    if(${PNG_ARM_NEON} STREQUAL "on")
-      add_definitions(-DPNG_ARM_NEON_OPT=2)
-    elseif(${PNG_ARM_NEON} STREQUAL "check")
-      add_definitions(-DPNG_ARM_NEON_CHECK_SUPPORTED)
-    endif()
-  else()
-    add_definitions(-DPNG_ARM_NEON_OPT=0)
-  endif()
-endif()
-
-# set definitions and sources for powerpc
-if(CMAKE_SYSTEM_PROCESSOR MATCHES "^powerpc*" OR
-  CMAKE_SYSTEM_PROCESSOR MATCHES "^ppc64*" )
-  set(PNG_POWERPC_VSX_POSSIBLE_VALUES on off)
-  set(PNG_POWERPC_VSX "on" CACHE STRING "Enable POWERPC VSX optimizations:
-     off: disable the optimizations.")
-  set_property(CACHE PNG_POWERPC_VSX PROPERTY STRINGS
-     ${PNG_POWERPC_VSX_POSSIBLE_VALUES})
-  list(FIND PNG_POWERPC_VSX_POSSIBLE_VALUES ${PNG_POWERPC_VSX} index)
-  if(index EQUAL -1)
-    message(FATAL_ERROR
-      " PNG_POWERPC_VSX must be one of [${PNG_POWERPC_VSX_POSSIBLE_VALUES}]")
-  elseif(NOT ${PNG_POWERPC_VSX} STREQUAL "no")
-    set(libpng_powerpc_sources
-      powerpc/powerpc_init.c
-      powerpc/filter_vsx_intrinsics.c)
-    if(${PNG_POWERPC_VSX} STREQUAL "on")
-      add_definitions(-DPNG_POWERPC_VSX_OPT=2)
-    endif()
-  else()
-    add_definitions(-DPNG_POWERPC_VSX_OPT=0)
-  endif()
-endif()
-
-# set definitions and sources for intel
-if(CMAKE_SYSTEM_PROCESSOR MATCHES "^i?86" OR
-  CMAKE_SYSTEM_PROCESSOR MATCHES "^x86_64*" )
-  set(PNG_INTEL_SSE_POSSIBLE_VALUES on off)
-  set(PNG_INTEL_SSE "on" CACHE STRING "Enable INTEL_SSE optimizations:
-     off: disable the optimizations")
-  set_property(CACHE PNG_INTEL_SSE PROPERTY STRINGS
-     ${PNG_INTEL_SSE_POSSIBLE_VALUES})
-  list(FIND PNG_INTEL_SSE_POSSIBLE_VALUES ${PNG_INTEL_SSE} index)
-  if(index EQUAL -1)
-    message(FATAL_ERROR
-      " PNG_INTEL_SSE must be one of [${PNG_INTEL_SSE_POSSIBLE_VALUES}]")
-  elseif(NOT ${PNG_INTEL_SSE} STREQUAL "no")
-    set(libpng_intel_sources
-      intel/intel_init.c
-      intel/filter_sse2_intrinsics.c)
-    if(${PNG_INTEL_SSE} STREQUAL "on")
-      add_definitions(-DPNG_INTEL_SSE_OPT=1)
-    endif()
-  else()
-    add_definitions(-DPNG_INTEL_SSE_OPT=0)
-  endif()
-endif()
-
-# set definitions and sources for MIPS
-if(CMAKE_SYSTEM_PROCESSOR MATCHES "mipsel*" OR
-  CMAKE_SYSTEM_PROCESSOR MATCHES "mips64el*" )
-  set(PNG_MIPS_MSA_POSSIBLE_VALUES on off)
-  set(PNG_MIPS_MSA "on" CACHE STRING "Enable MIPS_MSA optimizations:
-     off: disable the optimizations")
-  set_property(CACHE PNG_MIPS_MSA PROPERTY STRINGS
-     ${PNG_MIPS_MSA_POSSIBLE_VALUES})
-  list(FIND PNG_MIPS_MSA_POSSIBLE_VALUES ${PNG_MIPS_MSA} index)
-  if(index EQUAL -1)
-    message(FATAL_ERROR
-      " PNG_MIPS_MSA must be one of [${PNG_MIPS_MSA_POSSIBLE_VALUES}]")
-  elseif(NOT ${PNG_MIPS_MSA} STREQUAL "no")
-    set(libpng_mips_sources
-      mips/mips_init.c
-      mips/filter_msa_intrinsics.c)
-    if(${PNG_MIPS_MSA} STREQUAL "on")
-      add_definitions(-DPNG_MIPS_MSA_OPT=2)
-    endif()
-  else()
-    add_definitions(-DPNG_MIPS_MSA_OPT=0)
-  endif()
-endif()
-endif(PNG_HARDWARE_OPTIMIZATIONS)
-
-# SET LIBNAME
-set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})
-
-# to distinguish between debug and release lib
-set(CMAKE_DEBUG_POSTFIX "d")
-
-include(CheckCSourceCompiles)
-option(ld-version-script "Enable linker version script" ON)
-if(ld-version-script AND NOT APPLE)
-  # Check if LD supports linker scripts.
-  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/conftest.map" "VERS_1 {
-        global: sym;
-        local: *;
-};
-
-VERS_2 {
-        global: sym2;
-                main;
-} VERS_1;
-")
-  set(CMAKE_REQUIRED_FLAGS_SAVE ${CMAKE_REQUIRED_FLAGS})
-  set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS} "-Wl,--version-script='${CMAKE_CURRENT_BINARY_DIR}/conftest.map'")
-  check_c_source_compiles("void sym(void) {}
-void sym2(void) {}
-int main(void) {return 0;}
-" HAVE_LD_VERSION_SCRIPT)
-  if(NOT HAVE_LD_VERSION_SCRIPT)
-    set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_SAVE} "-Wl,-M -Wl,${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
-  check_c_source_compiles("void sym(void) {}
-void sym2(void) {}
-int main(void) {return 0;}
-" HAVE_SOLARIS_LD_VERSION_SCRIPT)
-  endif()
-  set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_SAVE})
-  file(REMOVE "${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
-endif()
-
-# Find symbol prefix.  Likely obsolete and unnecessary with recent
-# toolchains (it's not done in many other projects).
-function(symbol_prefix)
-  set(SYMBOL_PREFIX)
-
-  execute_process(COMMAND "${CMAKE_C_COMPILER}" "-E" "-"
-                  INPUT_FILE /dev/null
-                  OUTPUT_VARIABLE OUT
-                  RESULT_VARIABLE STATUS)
-
-  if(CPP_FAIL)
-    message(WARNING "Failed to run the C preprocessor")
-  endif()
-
-  string(REPLACE "\n" ";" OUT "${OUT}")
-  foreach(line ${OUT})
-    string(REGEX MATCH "^PREFIX=" found_match "${line}")
-    if(found_match)
-      STRING(REGEX REPLACE "^PREFIX=(.*\)" "\\1" prefix "${line}")
-      string(REGEX MATCH "__USER_LABEL_PREFIX__" found_match "${prefix}")
-      if(found_match)
-        STRING(REGEX REPLACE "(.*)__USER_LABEL_PREFIX__(.*)" "\\1\\2" prefix "${prefix}")
-      endif()
-      set(SYMBOL_PREFIX "${prefix}")
-    endif()
-  endforeach()
-
-    message(STATUS "Symbol prefix: ${SYMBOL_PREFIX}")
-    set(SYMBOL_PREFIX "${SYMBOL_PREFIX}" PARENT_SCOPE)
-endfunction()
-
-if(UNIX)
-  symbol_prefix()
-endif()
-
-find_program(AWK NAMES gawk awk)
-
-include_directories(${CMAKE_CURRENT_BINARY_DIR})
-
-if(NOT AWK OR ANDROID)
-  # No awk available to generate sources; use pre-built pnglibconf.h
-  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt
-                 ${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h)
-  add_custom_target(genfiles) # Dummy
-else()
-  include(CMakeParseArguments)
-  # Generate .chk from .out with awk
-  # generate_chk(INPUT inputfile OUTPUT outputfile [DEPENDS dep1 [dep2...]])
-  function(generate_chk)
-    set(options)
-    set(oneValueArgs INPUT OUTPUT)
-    set(multiValueArgs DEPENDS)
-    cmake_parse_arguments(_GC "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
-    if (NOT _GC_INPUT)
-      message(FATAL_ERROR "Invalid arguments.  generate_out requires input.")
-    endif()
-    if (NOT _GC_OUTPUT)
-      message(FATAL_ERROR "Invalid arguments.  generate_out requires output.")
-    endif()
-
-    add_custom_command(OUTPUT "${_GC_OUTPUT}"
-                       COMMAND "${CMAKE_COMMAND}"
-                               "-DINPUT=${_GC_INPUT}"
-                               "-DOUTPUT=${_GC_OUTPUT}"
-                               -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/genchk.cmake"
-                       DEPENDS "${_GC_INPUT}" ${_GC_DEPENDS}
-                       WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
-  endfunction()
-
-  # Generate .out from .c with awk
-  # generate_out(INPUT inputfile OUTPUT outputfile [DEPENDS dep1 [dep2...]])
-  function(generate_out)
-    set(options)
-    set(oneValueArgs INPUT OUTPUT)
-    set(multiValueArgs DEPENDS)
-    cmake_parse_arguments(_GO "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
-    if (NOT _GO_INPUT)
-      message(FATAL_ERROR "Invalid arguments.  generate_out requires input.")
-    endif()
-    if (NOT _GO_OUTPUT)
-      message(FATAL_ERROR "Invalid arguments.  generate_out requires output.")
-    endif()
-
-    add_custom_command(OUTPUT "${_GO_OUTPUT}"
-                       COMMAND "${CMAKE_COMMAND}"
-                               "-DINPUT=${_GO_INPUT}"
-                               "-DOUTPUT=${_GO_OUTPUT}"
-                               -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/genout.cmake"
-                       DEPENDS "${_GO_INPUT}" ${_GO_DEPENDS}
-                       WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
-  endfunction()
-
-  # Generate specific source file with awk
-  # generate_source(OUTPUT outputfile [DEPENDS dep1 [dep2...]])
-  function(generate_source)
-    set(options)
-    set(oneValueArgs OUTPUT)
-    set(multiValueArgs DEPENDS)
-    cmake_parse_arguments(_GSO "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
-    if (NOT _GSO_OUTPUT)
-      message(FATAL_ERROR "Invalid arguments.  generate_source requires output.")
-    endif()
-
-    add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${_GSO_OUTPUT}"
-                       COMMAND "${CMAKE_COMMAND}"
-                               "-DOUTPUT=${_GSO_OUTPUT}"
-                               -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake"
-                       DEPENDS ${_GSO_DEPENDS}
-                       WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
-  endfunction()
-
-  # Copy file
-  function(generate_copy source destination)
-    add_custom_command(OUTPUT "${destination}"
-                       COMMAND "${CMAKE_COMMAND}" -E remove "${destination}"
-                       COMMAND "${CMAKE_COMMAND}" -E copy "${source}"
-                                                          "${destination}"
-                       DEPENDS "${source}")
-  endfunction()
-
-  # Generate scripts/pnglibconf.h
-  generate_source(OUTPUT "scripts/pnglibconf.c"
-                  DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.dfa"
-                          "${CMAKE_CURRENT_SOURCE_DIR}/scripts/options.awk"
-                          "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h")
-
-  # Generate pnglibconf.c
-  generate_source(OUTPUT "pnglibconf.c"
-                  DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.dfa"
-                          "${CMAKE_CURRENT_SOURCE_DIR}/scripts/options.awk"
-                          "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h")
-
-  if(PNG_PREFIX)
-    set(PNGLIBCONF_H_EXTRA_DEPENDS
-        "${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out"
-        "${CMAKE_CURRENT_SOURCE_DIR}/scripts/macro.lst")
-    set(PNGPREFIX_H_EXTRA_DEPENDS
-        "${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out")
-  endif()
-
-  generate_out(INPUT "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.c"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out")
-
-  # Generate pnglibconf.h
-  generate_source(OUTPUT "pnglibconf.h"
-                  DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out"
-                          ${PNGLIBCONF_H_EXTRA_DEPENDS})
-
-  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/intprefix.c"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out"
-               DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h")
-
-  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/prefix.c"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out"
-               DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/png.h"
-                       "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h"
-                       "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out")
-
-  # Generate pngprefix.h
-  generate_source(OUTPUT "pngprefix.h"
-                  DEPENDS ${PNGPREFIX_H_EXTRA_DEPENDS})
-
-  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/sym.c"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out"
-               DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h")
-
-  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/symbols.c"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out"
-               DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/png.h"
-                       "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h"
-                       "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt")
-
-  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/vers.c"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out"
-               DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/png.h"
-                       "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h"
-                       "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h")
-
-  generate_chk(INPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk"
-               DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/scripts/checksym.awk"
-                       "${CMAKE_CURRENT_SOURCE_DIR}/scripts/symbols.def")
-
-  add_custom_target(symbol-check DEPENDS
-                    "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk")
-
-  generate_copy("${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out"
-                "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym")
-  generate_copy("${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out"
-                "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers")
-
-  add_custom_target(genvers DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers")
-  add_custom_target(gensym DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym")
-
-  add_custom_target("genprebuilt"
-                    COMMAND "${CMAKE_COMMAND}"
-                            "-DOUTPUT=scripts/pnglibconf.h.prebuilt"
-                            -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake"
-                    WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
-
-  # A single target handles generation of all generated files.  If
-  # they are dependend upon separately by multiple targets, this
-  # confuses parallel make (it would require a separate top-level
-  # target for each file to track the dependencies properly).
-  add_custom_target(genfiles DEPENDS
-    "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym"
-    "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers"
-    "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.c"
-    "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h"
-    "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out"
-    "${CMAKE_CURRENT_BINARY_DIR}/pngprefix.h"
-    "${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out"
-    "${CMAKE_CURRENT_BINARY_DIR}/scripts/pnglibconf.c"
-    "${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out"
-    "${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out"
-    "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk"
-    "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out"
-    "${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out")
-endif(NOT AWK OR ANDROID)
-
-# OUR SOURCES
-set(libpng_public_hdrs
-  png.h
-  pngconf.h
-  "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h"
-)
-set(libpng_private_hdrs
-  pngpriv.h
-  pngdebug.h
-  pnginfo.h
-  pngstruct.h
-)
-if(AWK AND NOT ANDROID)
-  list(APPEND libpng_private_hdrs "${CMAKE_CURRENT_BINARY_DIR}/pngprefix.h")
-endif()
-set(libpng_sources
-  ${libpng_public_hdrs}
-  ${libpng_private_hdrs}
-  png.c
-  pngerror.c
-  pngget.c
-  pngmem.c
-  pngpread.c
-  pngread.c
-  pngrio.c
-  pngrtran.c
-  pngrutil.c
-  pngset.c
-  pngtrans.c
-  pngwio.c
-  pngwrite.c
-  pngwtran.c
-  pngwutil.c
-  ${libpng_arm_sources}
-  ${libpng_intel_sources}
-  ${libpng_mips_sources}
-  ${libpng_powerpc_sources}
-)
-set(pngtest_sources
-  pngtest.c
-)
-set(pngvalid_sources
-  contrib/libtests/pngvalid.c
-)
-set(pngstest_sources
-  contrib/libtests/pngstest.c
-)
-set(pngunknown_sources
-  contrib/libtests/pngunknown.c
-)
-set(pngimage_sources
-  contrib/libtests/pngimage.c
-)
-set(pngfix_sources
-  contrib/tools/pngfix.c
-)
-set(png_fix_itxt_sources
-  contrib/tools/png-fix-itxt.c
-)
-
-if(MSVC)
-  add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
-endif(MSVC)
-
-if(PNG_DEBUG)
-  add_definitions(-DPNG_DEBUG)
-endif()
-
-# NOW BUILD OUR TARGET
-include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${ZLIB_INCLUDE_DIR})
-
-unset(PNG_LIB_TARGETS)
-
-if(PNG_SHARED)
-  add_library(png SHARED ${libpng_sources})
-  set(PNG_LIB_TARGETS png)
-  set_target_properties(png PROPERTIES OUTPUT_NAME ${PNG_LIB_NAME})
-  add_dependencies(png genfiles)
-  if(MSVC)
-    # msvc does not append 'lib' - do it here to have consistent name
-    set_target_properties(png PROPERTIES PREFIX "lib")
-    set_target_properties(png PROPERTIES IMPORT_PREFIX "lib")
-  endif()
-  target_link_libraries(png ${ZLIB_LIBRARY} ${M_LIBRARY})
-
-  if(UNIX AND AWK)
-    if(HAVE_LD_VERSION_SCRIPT)
-      set_target_properties(png PROPERTIES LINK_FLAGS
-        "-Wl,--version-script='${CMAKE_CURRENT_BINARY_DIR}/libpng.vers'")
-    elseif(HAVE_SOLARIS_LD_VERSION_SCRIPT)
-      set_target_properties(png PROPERTIES LINK_FLAGS
-        "-Wl,-M -Wl,'${CMAKE_CURRENT_BINARY_DIR}/libpng.vers'")
-    endif()
-  endif()
-endif()
-
-if(PNG_STATIC)
-  # does not work without changing name
-  set(PNG_LIB_NAME_STATIC png_static)
-  add_library(png_static STATIC ${libpng_sources})
-  add_dependencies(png_static genfiles)
-  # MSVC doesn't use a different file extension for shared vs. static
-  # libs.  We are able to change OUTPUT_NAME to remove the _static
-  # for all other platforms.
-  if(NOT MSVC)
-    set_target_properties(png_static PROPERTIES
-      OUTPUT_NAME "${PNG_LIB_NAME}"
-      CLEAN_DIRECT_OUTPUT 1)
-  else()
-    set_target_properties(png_static PROPERTIES
-      OUTPUT_NAME "${PNG_LIB_NAME}_static"
-      CLEAN_DIRECT_OUTPUT 1)
-  endif()
-  list(APPEND PNG_LIB_TARGETS png_static)
-  if(MSVC)
-    # msvc does not append 'lib' - do it here to have consistent name
-    set_target_properties(png_static PROPERTIES PREFIX "lib")
-  endif()
-  target_link_libraries(png_static ${ZLIB_LIBRARY} ${M_LIBRARY})
-endif()
-
-if(PNG_FRAMEWORK)
-  set(PNG_LIB_NAME_FRAMEWORK png_framework)
-  add_library(png_framework SHARED ${libpng_sources})
-  add_dependencies(png_framework genfiles)
-  list(APPEND PNG_LIB_TARGETS png_framework)
-  set_target_properties(png_framework PROPERTIES
-    FRAMEWORK TRUE
-    FRAMEWORK_VERSION ${PNGLIB_VERSION}
-    MACOSX_FRAMEWORK_SHORT_VERSION_STRING ${PNGLIB_MAJOR}.${PNGLIB_MINOR}
-    MACOSX_FRAMEWORK_BUNDLE_VERSION ${PNGLIB_VERSION}
-    MACOSX_FRAMEWORK_IDENTIFIER org.libpng.libpng
-    XCODE_ATTRIBUTE_INSTALL_PATH "@rpath"
-    PUBLIC_HEADER "${libpng_public_hdrs}"
-    OUTPUT_NAME png)
-  target_link_libraries(png_framework ${ZLIB_LIBRARY} ${M_LIBRARY})
-endif()
-
-if(NOT PNG_LIB_TARGETS)
-  message(SEND_ERROR
-    "No library variant selected to build. "
-    "Please enable at least one of the following options: "
-    " PNG_STATIC, PNG_SHARED, PNG_FRAMEWORK")
-endif()
-
-if(PNG_SHARED AND WIN32)
-  set_target_properties(png PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)
-endif()
-
-function(png_add_test)
-  set(options)
-  set(oneValueArgs NAME COMMAND)
-  set(multiValueArgs OPTIONS FILES)
-  cmake_parse_arguments(_PAT "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
-
-  if (NOT _PAT_NAME)
-    message(FATAL_ERROR "Invalid arguments.  png_add_test requires name.")
-  endif()
-  if (NOT _PAT_COMMAND)
-    message(FATAL_ERROR "Invalid arguments.  png_add_test requires command.")
-  endif()
-
-  set(TEST_OPTIONS "${_PAT_OPTIONS}")
-  set(TEST_FILES "${_PAT_FILES}")
-
-  configure_file("${CMAKE_CURRENT_SOURCE_DIR}/scripts/test.cmake.in"
-                 "${CMAKE_CURRENT_BINARY_DIR}/tests/${_PAT_NAME}.cmake" @ONLY)
-  if(CMAKE_MAJOR_VERSION GREATER 2) # have generator expressions
-    add_test(NAME "${_PAT_NAME}"
-             COMMAND "${CMAKE_COMMAND}"
-             "-DLIBPNG=$<TARGET_FILE:png>"
-             "-DTEST_COMMAND=$<TARGET_FILE:${_PAT_COMMAND}>"
-             -P "${CMAKE_CURRENT_BINARY_DIR}/tests/${_PAT_NAME}.cmake")
-  else() # old 2.x add_test; limited and won't work well on Windows
-    # Note LIBPNG is a dummy value as there are no generator expressions
-    add_test("${_PAT_NAME}" "${CMAKE_COMMAND}"
-             "-DLIBPNG=${CMAKE_CURRENT_BINARY_DIR}/libpng.so"
-             "-DTEST_COMMAND=./${_PAT_COMMAND}"
-             -P "${CMAKE_CURRENT_BINARY_DIR}/tests/${_PAT_NAME}.cmake")
-  endif()
-endfunction()
-
-if(PNG_TESTS AND PNG_SHARED)
-  # Find test PNG files by globbing, but sort lists to ensure
-  # consistency between different filesystems.
-  file(GLOB PNGSUITE_PNGS "${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/*.png")
-  list(SORT PNGSUITE_PNGS)
-  file(GLOB TEST_PNGS "${CMAKE_CURRENT_SOURCE_DIR}/contrib/testpngs/*.png")
-  list(SORT TEST_PNGS)
-
-  set(PNGTEST_PNG "${CMAKE_CURRENT_SOURCE_DIR}/pngtest.png")
-
-  add_executable(pngtest ${pngtest_sources})
-  target_link_libraries(pngtest png)
-
-  png_add_test(NAME pngtest COMMAND pngtest FILES "${PNGTEST_PNG}")
-
-  add_executable(pngvalid ${pngvalid_sources})
-  target_link_libraries(pngvalid png)
-
-  png_add_test(NAME pngvalid-gamma-16-to-8
-               COMMAND pngvalid OPTIONS --gamma-16-to-8)
-  png_add_test(NAME pngvalid-gamma-alpha-mode
-               COMMAND pngvalid OPTIONS --gamma-alpha-mode)
-  png_add_test(NAME pngvalid-gamma-background
-               COMMAND pngvalid OPTIONS --gamma-background)
-  png_add_test(NAME pngvalid-gamma-expand16-alpha-mode
-               COMMAND pngvalid OPTIONS --gamma-alpha-mode --expand16)
-  png_add_test(NAME pngvalid-gamma-expand16-background
-               COMMAND pngvalid OPTIONS --gamma-background --expand16)
-  png_add_test(NAME pngvalid-gamma-expand16-transform
-               COMMAND pngvalid OPTIONS --gamma-transform --expand16)
-  png_add_test(NAME pngvalid-gamma-sbit
-               COMMAND pngvalid OPTIONS --gamma-sbit)
-  png_add_test(NAME pngvalid-gamma-threshold
-               COMMAND pngvalid OPTIONS --gamma-threshold)
-  png_add_test(NAME pngvalid-gamma-transform
-               COMMAND pngvalid OPTIONS --gamma-transform)
-  png_add_test(NAME pngvalid-progressive-interlace-standard
-               COMMAND pngvalid OPTIONS --standard --progressive-read --interlace)
-  png_add_test(NAME pngvalid-progressive-size
-               COMMAND pngvalid OPTIONS --size --progressive-read)
-  png_add_test(NAME pngvalid-progressive-standard
-               COMMAND pngvalid OPTIONS --standard --progressive-read)
-  png_add_test(NAME pngvalid-standard
-               COMMAND pngvalid OPTIONS --standard)
-  png_add_test(NAME pngvalid-transform
-               COMMAND pngvalid OPTIONS --transform)
-
-  add_executable(pngstest ${pngstest_sources})
-  target_link_libraries(pngstest png)
-
-  foreach(gamma_type 1.8 linear none sRGB)
-    foreach(alpha_type none alpha)
-      set(PNGSTEST_FILES)
-      foreach(test_png ${TEST_PNGS})
-        string(REGEX MATCH ".*-linear[-.].*" TEST_PNG_LINEAR "${test_png}")
-        string(REGEX MATCH ".*-sRGB[-.].*" TEST_PNG_SRGB "${test_png}")
-        string(REGEX MATCH ".*-1.8[-.].*" TEST_PNG_G18 "${test_png}")
-        string(REGEX MATCH ".*-alpha-.*" TEST_PNG_ALPHA "${test_png}")
-
-        set(TEST_PNG_VALID TRUE)
-
-        if(TEST_PNG_ALPHA)
-          if (NOT "${alpha_type}" STREQUAL "alpha")
-            set(TEST_PNG_VALID FALSE)
-          endif()
-        else()
-          if ("${alpha_type}" STREQUAL "alpha")
-            set(TEST_PNG_VALID FALSE)
-          endif()
-        endif()
-
-        if(TEST_PNG_LINEAR)
-          if(NOT "${gamma_type}" STREQUAL "linear")
-            set(TEST_PNG_VALID FALSE)
-          endif()
-        elseif(TEST_PNG_SRGB)
-          if(NOT "${gamma_type}" STREQUAL "sRGB")
-            set(TEST_PNG_VALID FALSE)
-          endif()
-        elseif(TEST_PNG_G18)
-          if(NOT "${gamma_type}" STREQUAL "1.8")
-            set(TEST_PNG_VALID FALSE)
-          endif()
-        else()
-          if(NOT "${gamma_type}" STREQUAL "none")
-            set(TEST_PNG_VALID FALSE)
-          endif()
-        endif()
-
-        if(TEST_PNG_VALID)
-          list(APPEND PNGSTEST_FILES "${test_png}")
-        endif()
-      endforeach()
-      # Should already be sorted, but sort anyway to be certain.
-      list(SORT PNGSTEST_FILES)
-      png_add_test(NAME pngstest-${gamma_type}-${alpha_type}
-                   COMMAND pngstest
-                   OPTIONS --tmpfile "${gamma_type}-${alpha_type}-" --log
-                   FILES ${PNGSTEST_FILES})
-    endforeach()
-  endforeach()
-
-  add_executable(pngunknown ${pngunknown_sources})
-  target_link_libraries(pngunknown png)
-
-  png_add_test(NAME pngunknown-discard COMMAND pngunknown OPTIONS --strict default=discard FILES "${PNGTEST_PNG}")
-  png_add_test(NAME pngunknown-IDAT COMMAND pngunknown OPTIONS --strict default=discard IDAT=save FILES "${PNGTEST_PNG}")
-  png_add_test(NAME pngunknown-if-safe COMMAND pngunknown OPTIONS --strict default=if-safe FILES "${PNGTEST_PNG}")
-  png_add_test(NAME pngunknown-sAPI COMMAND pngunknown OPTIONS --strict bKGD=save cHRM=save gAMA=save all=discard iCCP=save sBIT=save sRGB=save FILES "${PNGTEST_PNG}")
-  png_add_test(NAME pngunknown-save COMMAND pngunknown OPTIONS --strict default=save FILES "${PNGTEST_PNG}")
-  png_add_test(NAME pngunknown-sTER COMMAND pngunknown OPTIONS --strict sTER=if-safe FILES "${PNGTEST_PNG}")
-  png_add_test(NAME pngunknown-vpAg COMMAND pngunknown OPTIONS --strict vpAg=if-safe FILES "${PNGTEST_PNG}")
-
-  add_executable(pngimage ${pngimage_sources})
-  target_link_libraries(pngimage png)
-
-  png_add_test(NAME pngimage-quick COMMAND pngimage OPTIONS --list-combos --log FILES ${PNGSUITE_PNGS})
-  png_add_test(NAME pngimage-full COMMAND pngimage OPTIONS --exhaustive --list-combos --log FILES ${PNGSUITE_PNGS})
-endif()
-
-if(PNG_SHARED)
-  add_executable(pngfix ${pngfix_sources})
-  target_link_libraries(pngfix png)
-  set(PNG_BIN_TARGETS pngfix)
-
-  add_executable(png-fix-itxt ${png_fix_itxt_sources})
-  target_link_libraries(png-fix-itxt ${ZLIB_LIBRARY} ${M_LIBRARY})
-  list(APPEND PNG_BIN_TARGETS png-fix-itxt)
-endif()
-
-# Set a variable with CMake code which:
-# Creates a symlink from src to dest (if possible) or alternatively
-# copies if different.
-include(CMakeParseArguments)
-
-function(CREATE_SYMLINK DEST_FILE)
-
-  cmake_parse_arguments(S "" "FILE;TARGET" "" ${ARGN})
-
-  if(NOT S_TARGET AND NOT S_FILE)
-    message(FATAL_ERROR "Specify either a TARGET or a FILE for CREATE_SYMLINK to link to.")
-  endif(NOT S_TARGET AND NOT S_FILE)
-
-  if(S_TARGET AND S_FILE)
-    message(FATAL_ERROR "CREATE_SYMLINK called with both source file ${S_FILE} and build target ${S_TARGET} arguments - can only handle 1 type per call.")
-  endif(S_TARGET AND S_FILE)
-
-  if(S_FILE)
-    # If we don't need to symlink something that's coming from a build target,
-    # we can go ahead and symlink/copy at configure time.
-
-    if(CMAKE_HOST_WIN32 AND NOT CYGWIN AND NOT MSYS)
-      execute_process(
-  COMMAND "${CMAKE_COMMAND}" -E copy_if_different ${S_FILE} ${DEST_FILE}
-  WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
-  )
-    else(CMAKE_HOST_WIN32 AND NOT CYGWIN AND NOT MSYS)
-      execute_process(
-  COMMAND ${CMAKE_COMMAND} -E create_symlink ${S_FILE} ${DEST_FILE}
-  WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
-  )
-    endif(CMAKE_HOST_WIN32 AND NOT CYGWIN AND NOT MSYS)
-  endif(S_FILE)
-
-  if(S_TARGET)
-    # We need to use generator expressions, which can be a bit tricky, so for
-    # simplicity make the symlink a POST_BUILD step and use the TARGET
-    # signature of add_custom_command.
-
-    if(CMAKE_HOST_WIN32 AND NOT CYGWIN AND NOT MSYS)
-      add_custom_command(TARGET ${S_TARGET} POST_BUILD
-  COMMAND "${CMAKE_COMMAND}" -E copy_if_different $<TARGET_LINKER_FILE_NAME:${S_TARGET}> $<TARGET_LINKER_FILE_DIR:${S_TARGET}>/${DEST_FILE}
-  )
-    else(CMAKE_HOST_WIN32 AND NOT CYGWIN AND NOT MSYS)
-      add_custom_command(TARGET ${S_TARGET} POST_BUILD
-  COMMAND "${CMAKE_COMMAND}" -E create_symlink $<TARGET_LINKER_FILE_NAME:${S_TARGET}> $<TARGET_LINKER_FILE_DIR:${S_TARGET}>/${DEST_FILE}
-  )
-    endif(CMAKE_HOST_WIN32 AND NOT CYGWIN AND NOT MSYS)
-
-  endif(S_TARGET)
-
-endfunction()
-
-# Create source generation scripts.
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/genchk.cmake.in
-               ${CMAKE_CURRENT_BINARY_DIR}/scripts/genchk.cmake @ONLY)
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/genout.cmake.in
-               ${CMAKE_CURRENT_BINARY_DIR}/scripts/genout.cmake @ONLY)
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/gensrc.cmake.in
-               ${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake @ONLY)
-
-
-# libpng is a library so default to 'lib'
-if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
-  set(CMAKE_INSTALL_LIBDIR lib)
-endif(NOT DEFINED CMAKE_INSTALL_LIBDIR)
-
-# CREATE PKGCONFIG FILES
-# we use the same files like ./configure, so we have to set its vars
-# Only do this on Windows for Cygwin - the files don't make much sense outside
-# a UNIX look alike
-if(NOT WIN32 OR CYGWIN OR MINGW)
-  set(prefix      ${CMAKE_INSTALL_PREFIX})
-  set(exec_prefix ${CMAKE_INSTALL_PREFIX})
-  set(libdir      ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})
-  set(includedir  ${CMAKE_INSTALL_PREFIX}/include)
-  set(LIBS        "-lz -lm")
-  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in
-    ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc @ONLY)
-  CREATE_SYMLINK(libpng.pc FILE ${PNGLIB_NAME}.pc)
-
-  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng-config.in
-    ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config @ONLY)
-  CREATE_SYMLINK(libpng-config FILE ${PNGLIB_NAME}-config)
-endif(NOT WIN32 OR CYGWIN OR MINGW)
-
-# SET UP LINKS
-if(PNG_SHARED)
-  set_target_properties(png PROPERTIES
-#   VERSION 16.${PNGLIB_RELEASE}.1.6.34
-    VERSION 16.${PNGLIB_RELEASE}.0
-    SOVERSION 16
-    CLEAN_DIRECT_OUTPUT 1)
-endif()
-
-# If CMake > 2.4.x, we set a variable used below to export
-# targets to an export file.
-# TODO: Use VERSION_GREATER after our cmake_minimum_required >= 2.6.2
-if(CMAKE_MAJOR_VERSION GREATER 1 AND CMAKE_MINOR_VERSION GREATER 4)
-  set(PNG_EXPORT_RULE EXPORT libpng)
-elseif(CMAKE_MAJOR_VERSION GREATER 2) # future proof
-  set(PNG_EXPORT_RULE EXPORT libpng)
-endif()
-
-# INSTALL
-if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
-  install(TARGETS ${PNG_LIB_TARGETS}
-      ${PNG_EXPORT_RULE}
-      RUNTIME DESTINATION bin
-      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
-      FRAMEWORK DESTINATION ${CMAKE_INSTALL_LIBDIR})
-
-  if(PNG_SHARED)
-    # Create a symlink for libpng.dll.a => libpng16.dll.a on Cygwin
-    if(CYGWIN OR MINGW)
-      CREATE_SYMLINK(libpng${CMAKE_IMPORT_LIBRARY_SUFFIX} TARGET png)
-      install(FILES $<TARGET_LINKER_FILE_DIR:png>/libpng${CMAKE_IMPORT_LIBRARY_SUFFIX} DESTINATION ${CMAKE_INSTALL_LIBDIR})
-    endif(CYGWIN OR MINGW)
-
-    if(NOT WIN32)
-      CREATE_SYMLINK(libpng${CMAKE_SHARED_LIBRARY_SUFFIX} TARGET png)
-      install(FILES $<TARGET_LINKER_FILE_DIR:png>/libpng${CMAKE_SHARED_LIBRARY_SUFFIX} DESTINATION ${CMAKE_INSTALL_LIBDIR})
-    endif(NOT WIN32)
-  endif(PNG_SHARED)
-
-  if(PNG_STATIC)
-    if(NOT WIN32 OR CYGWIN OR MINGW)
-      CREATE_SYMLINK( libpng${CMAKE_STATIC_LIBRARY_SUFFIX} TARGET png_static)
-      install(FILES $<TARGET_LINKER_FILE_DIR:png_static>/libpng${CMAKE_STATIC_LIBRARY_SUFFIX} DESTINATION ${CMAKE_INSTALL_LIBDIR})
-    endif(NOT WIN32 OR CYGWIN OR MINGW)
- endif()
-endif()
-
-if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
-  install(FILES ${libpng_public_hdrs}   DESTINATION include)
-  install(FILES ${libpng_public_hdrs}   DESTINATION include/${PNGLIB_NAME})
-endif()
-if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL )
-  if(NOT WIN32 OR CYGWIN OR MINGW)
-    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config DESTINATION bin)
-    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
-            DESTINATION bin)
-  endif(NOT WIN32 OR CYGWIN OR MINGW)
-endif()
-
-if(NOT SKIP_INSTALL_PROGRAMS AND NOT SKIP_INSTALL_ALL )
-  install(TARGETS ${PNG_BIN_TARGETS}
-      RUNTIME DESTINATION bin)
-endif()
-
-if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
-  # Install man pages
-  if(NOT PNG_MAN_DIR)
-    set(PNG_MAN_DIR "share/man")
-  endif()
-  install(FILES libpng.3 libpngpf.3      DESTINATION ${PNG_MAN_DIR}/man3)
-  install(FILES png.5                    DESTINATION ${PNG_MAN_DIR}/man5)
-  # Install pkg-config files
-  if(NOT CMAKE_HOST_WIN32 OR CYGWIN OR MINGW)
-    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng.pc
-            DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
-    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config
-            DESTINATION bin)
-    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc
-            DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
-    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
-            DESTINATION bin)
-  endif(NOT CMAKE_HOST_WIN32 OR CYGWIN OR MINGW)
-endif()
-
-# On versions of CMake that support it, create an export file CMake
-# users can include() to import our targets
-if(PNG_EXPORT_RULE AND NOT SKIP_INSTALL_EXPORT AND NOT SKIP_INSTALL_ALL )
-  install(EXPORT libpng DESTINATION lib/libpng FILE lib${PNG_LIB_NAME}.cmake)
-endif()
-
-# what's with libpng-manual.txt and all the extra files?
-
-# UNINSTALL
-# do we need this?
-
-# DIST
-# do we need this?
-
-# to create msvc import lib for mingw compiled shared lib
-# pexports libpng.dll > libpng.def
-# lib /def:libpng.def /machine:x86
diff --git a/src/png/libpng/LICENSE b/src/png/libpng/LICENSE
deleted file mode 100644
index 4cda4fa0a..000000000
--- a/src/png/libpng/LICENSE
+++ /dev/null
@@ -1,133 +0,0 @@
-
-This copy of the libpng notices is provided for your convenience.  In case of
-any discrepancy between this copy and the notices in the file png.h that is
-included in the libpng distribution, the latter shall prevail.
-
-COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
-
-If you modify libpng you may insert additional notices immediately following
-this sentence.
-
-This code is released under the libpng license.
-
-libpng versions 1.0.7, July 1, 2000 through 1.6.34, September 29, 2017 are
-Copyright (c) 2000-2002, 2004, 2006-2017 Glenn Randers-Pehrson, are
-derived from libpng-1.0.6, and are distributed according to the same
-disclaimer and license as libpng-1.0.6 with the following individuals
-added to the list of Contributing Authors:
-
-   Simon-Pierre Cadieux
-   Eric S. Raymond
-   Mans Rullgard
-   Cosmin Truta
-   Gilles Vollant
-   James Yu
-   Mandar Sahastrabuddhe
-   Google Inc.
-   Vadim Barkov
-
-and with the following additions to the disclaimer:
-
-   There is no warranty against interference with your enjoyment of the
-   library or against infringement.  There is no warranty that our
-   efforts or the library will fulfill any of your particular purposes
-   or needs.  This library is provided with all faults, and the entire
-   risk of satisfactory quality, performance, accuracy, and effort is with
-   the user.
-
-Some files in the "contrib" directory and some configure-generated
-files that are distributed with libpng have other copyright owners and
-are released under other open source licenses.
-
-libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
-Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
-libpng-0.96, and are distributed according to the same disclaimer and
-license as libpng-0.96, with the following individuals added to the list
-of Contributing Authors:
-
-   Tom Lane
-   Glenn Randers-Pehrson
-   Willem van Schaik
-
-libpng versions 0.89, June 1996, through 0.96, May 1997, are
-Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88,
-and are distributed according to the same disclaimer and license as
-libpng-0.88, with the following individuals added to the list of
-Contributing Authors:
-
-   John Bowler
-   Kevin Bracey
-   Sam Bushell
-   Magnus Holmgren
-   Greg Roelofs
-   Tom Tanner
-
-Some files in the "scripts" directory have other copyright owners
-but are released under this license.
-
-libpng versions 0.5, May 1995, through 0.88, January 1996, are
-Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
-
-For the purposes of this copyright and license, "Contributing Authors"
-is defined as the following set of individuals:
-
-   Andreas Dilger
-   Dave Martindale
-   Guy Eric Schalnat
-   Paul Schmidt
-   Tim Wegner
-
-The PNG Reference Library is supplied "AS IS".  The Contributing Authors
-and Group 42, Inc. disclaim all warranties, expressed or implied,
-including, without limitation, the warranties of merchantability and of
-fitness for any purpose.  The Contributing Authors and Group 42, Inc.
-assume no liability for direct, indirect, incidental, special, exemplary,
-or consequential damages, which may result from the use of the PNG
-Reference Library, even if advised of the possibility of such damage.
-
-Permission is hereby granted to use, copy, modify, and distribute this
-source code, or portions hereof, for any purpose, without fee, subject
-to the following restrictions:
-
-  1. The origin of this source code must not be misrepresented.
-
-  2. Altered versions must be plainly marked as such and must not
-     be misrepresented as being the original source.
-
-  3. This Copyright notice may not be removed or altered from any
-     source or altered source distribution.
-
-The Contributing Authors and Group 42, Inc. specifically permit, without
-fee, and encourage the use of this source code as a component to
-supporting the PNG file format in commercial products.  If you use this
-source code in a product, acknowledgment is not required but would be
-appreciated.
-
-END OF COPYRIGHT NOTICE, DISCLAIMER, and LICENSE.
-
-TRADEMARK:
-
-The name "libpng" has not been registered by the Copyright owner
-as a trademark in any jurisdiction.  However, because libpng has
-been distributed and maintained world-wide, continually since 1995,
-the Copyright owner claims "common-law trademark protection" in any
-jurisdiction where common-law trademark is recognized.
-
-OSI CERTIFICATION:
-
-Libpng is OSI Certified Open Source Software.  OSI Certified Open Source is
-a certification mark of the Open Source Initiative. OSI has not addressed
-the additional disclaimers inserted at version 1.0.7.
-
-EXPORT CONTROL:
-
-The Copyright owner believes that the Export Control Classification
-Number (ECCN) for libpng is EAR99, which means not subject to export
-controls or International Traffic in Arms Regulations (ITAR) because
-it is open source, publicly available software, that does not contain
-any encryption software.  See the EAR, paragraphs 734.3(b)(3) and
-734.7(b).
-
-Glenn Randers-Pehrson
-glennrp at users.sourceforge.net
-September 29, 2017
diff --git a/src/png/libpng/arm/arm_init.c b/src/png/libpng/arm/arm_init.c
deleted file mode 100644
index 02df812e7..000000000
--- a/src/png/libpng/arm/arm_init.c
+++ /dev/null
@@ -1,135 +0,0 @@
-
-/* arm_init.c - NEON optimised filter functions
- *
- * Copyright (c) 2014,2016 Glenn Randers-Pehrson
- * Written by Mans Rullgard, 2011.
- * Last changed in libpng 1.6.22 [May 26, 2016]
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-/* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are
- * called.
- */
-#define _POSIX_SOURCE 1
-
-#include "../pngpriv.h"
-
-#ifdef PNG_READ_SUPPORTED
-
-#if PNG_ARM_NEON_OPT > 0
-#ifdef PNG_ARM_NEON_CHECK_SUPPORTED /* Do run-time checks */
-/* WARNING: it is strongly recommended that you do not build libpng with
- * run-time checks for CPU features if at all possible.  In the case of the ARM
- * NEON instructions there is no processor-specific way of detecting the
- * presence of the required support, therefore run-time detection is extremely
- * OS specific.
- *
- * You may set the macro PNG_ARM_NEON_FILE to the file name of file containing
- * a fragment of C source code which defines the png_have_neon function.  There
- * are a number of implementations in contrib/arm-neon, but the only one that
- * has partial support is contrib/arm-neon/linux.c - a generic Linux
- * implementation which reads /proc/cpufino.
- */
-#ifndef PNG_ARM_NEON_FILE
-#  ifdef __linux__
-#     define PNG_ARM_NEON_FILE "contrib/arm-neon/linux.c"
-#  endif
-#endif
-
-#ifdef PNG_ARM_NEON_FILE
-
-#include <signal.h> /* for sig_atomic_t */
-static int png_have_neon(png_structp png_ptr);
-#include PNG_ARM_NEON_FILE
-
-#else  /* PNG_ARM_NEON_FILE */
-#  error "PNG_ARM_NEON_FILE undefined: no support for run-time ARM NEON checks"
-#endif /* PNG_ARM_NEON_FILE */
-#endif /* PNG_ARM_NEON_CHECK_SUPPORTED */
-
-#ifndef PNG_ALIGNED_MEMORY_SUPPORTED
-#  error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED"
-#endif
-
-void
-png_init_filter_functions_neon(png_structp pp, unsigned int bpp)
-{
-   /* The switch statement is compiled in for ARM_NEON_API, the call to
-    * png_have_neon is compiled in for ARM_NEON_CHECK.  If both are defined
-    * the check is only performed if the API has not set the NEON option on
-    * or off explicitly.  In this case the check controls what happens.
-    *
-    * If the CHECK is not compiled in and the option is UNSET the behavior prior
-    * to 1.6.7 was to use the NEON code - this was a bug caused by having the
-    * wrong order of the 'ON' and 'default' cases.  UNSET now defaults to OFF,
-    * as documented in png.h
-    */
-   png_debug(1, "in png_init_filter_functions_neon");
-#ifdef PNG_ARM_NEON_API_SUPPORTED
-   switch ((pp->options >> PNG_ARM_NEON) & 3)
-   {
-      case PNG_OPTION_UNSET:
-         /* Allow the run-time check to execute if it has been enabled -
-          * thus both API and CHECK can be turned on.  If it isn't supported
-          * this case will fall through to the 'default' below, which just
-          * returns.
-          */
-#endif /* PNG_ARM_NEON_API_SUPPORTED */
-#ifdef PNG_ARM_NEON_CHECK_SUPPORTED
-         {
-            static volatile sig_atomic_t no_neon = -1; /* not checked */
-
-            if (no_neon < 0)
-               no_neon = !png_have_neon(pp);
-
-            if (no_neon)
-               return;
-         }
-#ifdef PNG_ARM_NEON_API_SUPPORTED
-         break;
-#endif
-#endif /* PNG_ARM_NEON_CHECK_SUPPORTED */
-
-#ifdef PNG_ARM_NEON_API_SUPPORTED
-      default: /* OFF or INVALID */
-         return;
-
-      case PNG_OPTION_ON:
-         /* Option turned on */
-         break;
-   }
-#endif
-
-   /* IMPORTANT: any new external functions used here must be declared using
-    * PNG_INTERNAL_FUNCTION in ../pngpriv.h.  This is required so that the
-    * 'prefix' option to configure works:
-    *
-    *    ./configure --with-libpng-prefix=foobar_
-    *
-    * Verify you have got this right by running the above command, doing a build
-    * and examining pngprefix.h; it must contain a #define for every external
-    * function you add.  (Notice that this happens automatically for the
-    * initialization function.)
-    */
-   pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_neon;
-
-   if (bpp == 3)
-   {
-      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_neon;
-      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_neon;
-      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
-         png_read_filter_row_paeth3_neon;
-   }
-
-   else if (bpp == 4)
-   {
-      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_neon;
-      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_neon;
-      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
-          png_read_filter_row_paeth4_neon;
-   }
-}
-#endif /* PNG_ARM_NEON_OPT > 0 */
-#endif /* READ */
diff --git a/src/png/libpng/arm/filter_neon.S b/src/png/libpng/arm/filter_neon.S
deleted file mode 100644
index 000764cd2..000000000
--- a/src/png/libpng/arm/filter_neon.S
+++ /dev/null
@@ -1,253 +0,0 @@
-
-/* filter_neon.S - NEON optimised filter functions
- *
- * Copyright (c) 2014,2017 Glenn Randers-Pehrson
- * Written by Mans Rullgard, 2011.
- * Last changed in libpng 1.6.31 [July 27, 2017]
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-/* This is required to get the symbol renames, which are #defines, and the
- * definitions (or not) of PNG_ARM_NEON_OPT and PNG_ARM_NEON_IMPLEMENTATION.
- */
-#define PNG_VERSION_INFO_ONLY
-#include "../pngpriv.h"
-
-#if (defined(__linux__) || defined(__FreeBSD__)) && defined(__ELF__)
-.section .note.GNU-stack,"",%progbits /* mark stack as non-executable */
-#endif
-
-#ifdef PNG_READ_SUPPORTED
-
-/* Assembler NEON support - only works for 32-bit ARM (i.e. it does not work for
- * ARM64).  The code in arm/filter_neon_intrinsics.c supports ARM64, however it
- * only works if -mfpu=neon is specified on the GCC command line.  See pngpriv.h
- * for the logic which sets PNG_USE_ARM_NEON_ASM:
- */
-#if PNG_ARM_NEON_IMPLEMENTATION == 2 /* hand-coded assembler */
-
-#if PNG_ARM_NEON_OPT > 0
-
-#ifdef __ELF__
-#   define ELF
-#else
-#   define ELF @
-#endif
-
-        .arch armv7-a
-        .fpu  neon
-
-.macro  func    name, export=0
-    .macro endfunc
-ELF     .size   \name, . - \name
-        .endfunc
-        .purgem endfunc
-    .endm
-        .text
-
-        /* Explicitly specifying alignment here because some versions of
-         * GAS don't align code correctly.  This is harmless in correctly
-         * written versions of GAS.
-         */
-        .align 2
-
-    .if \export
-        .global \name
-    .endif
-ELF     .type   \name, STT_FUNC
-        .func   \name
-\name:
-.endm
-
-func    png_read_filter_row_sub4_neon, export=1
-        ldr             r3,  [r0, #4]           @ rowbytes
-        vmov.i8         d3,  #0
-1:
-        vld4.32         {d4[],d5[],d6[],d7[]},    [r1,:128]
-        vadd.u8         d0,  d3,  d4
-        vadd.u8         d1,  d0,  d5
-        vadd.u8         d2,  d1,  d6
-        vadd.u8         d3,  d2,  d7
-        vst4.32         {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
-        subs            r3,  r3,  #16
-        bgt             1b
-
-        bx              lr
-endfunc
-
-func    png_read_filter_row_sub3_neon, export=1
-        ldr             r3,  [r0, #4]           @ rowbytes
-        vmov.i8         d3,  #0
-        mov             r0,  r1
-        mov             r2,  #3
-        mov             r12, #12
-        vld1.8          {q11},    [r0], r12
-1:
-        vext.8          d5,  d22, d23, #3
-        vadd.u8         d0,  d3,  d22
-        vext.8          d6,  d22, d23, #6
-        vadd.u8         d1,  d0,  d5
-        vext.8          d7,  d23, d23, #1
-        vld1.8          {q11},    [r0], r12
-        vst1.32         {d0[0]},  [r1,:32], r2
-        vadd.u8         d2,  d1,  d6
-        vst1.32         {d1[0]},  [r1], r2
-        vadd.u8         d3,  d2,  d7
-        vst1.32         {d2[0]},  [r1], r2
-        vst1.32         {d3[0]},  [r1], r2
-        subs            r3,  r3,  #12
-        bgt             1b
-
-        bx              lr
-endfunc
-
-func    png_read_filter_row_up_neon, export=1
-        ldr             r3,  [r0, #4]           @ rowbytes
-1:
-        vld1.8          {q0}, [r1,:128]
-        vld1.8          {q1}, [r2,:128]!
-        vadd.u8         q0,  q0,  q1
-        vst1.8          {q0}, [r1,:128]!
-        subs            r3,  r3,  #16
-        bgt             1b
-
-        bx              lr
-endfunc
-
-func    png_read_filter_row_avg4_neon, export=1
-        ldr             r12, [r0, #4]           @ rowbytes
-        vmov.i8         d3,  #0
-1:
-        vld4.32         {d4[],d5[],d6[],d7[]},    [r1,:128]
-        vld4.32         {d16[],d17[],d18[],d19[]},[r2,:128]!
-        vhadd.u8        d0,  d3,  d16
-        vadd.u8         d0,  d0,  d4
-        vhadd.u8        d1,  d0,  d17
-        vadd.u8         d1,  d1,  d5
-        vhadd.u8        d2,  d1,  d18
-        vadd.u8         d2,  d2,  d6
-        vhadd.u8        d3,  d2,  d19
-        vadd.u8         d3,  d3,  d7
-        vst4.32         {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
-        subs            r12, r12, #16
-        bgt             1b
-
-        bx              lr
-endfunc
-
-func    png_read_filter_row_avg3_neon, export=1
-        push            {r4,lr}
-        ldr             r12, [r0, #4]           @ rowbytes
-        vmov.i8         d3,  #0
-        mov             r0,  r1
-        mov             r4,  #3
-        mov             lr,  #12
-        vld1.8          {q11},    [r0], lr
-1:
-        vld1.8          {q10},    [r2], lr
-        vext.8          d5,  d22, d23, #3
-        vhadd.u8        d0,  d3,  d20
-        vext.8          d17, d20, d21, #3
-        vadd.u8         d0,  d0,  d22
-        vext.8          d6,  d22, d23, #6
-        vhadd.u8        d1,  d0,  d17
-        vext.8          d18, d20, d21, #6
-        vadd.u8         d1,  d1,  d5
-        vext.8          d7,  d23, d23, #1
-        vld1.8          {q11},    [r0], lr
-        vst1.32         {d0[0]},  [r1,:32], r4
-        vhadd.u8        d2,  d1,  d18
-        vst1.32         {d1[0]},  [r1], r4
-        vext.8          d19, d21, d21, #1
-        vadd.u8         d2,  d2,  d6
-        vhadd.u8        d3,  d2,  d19
-        vst1.32         {d2[0]},  [r1], r4
-        vadd.u8         d3,  d3,  d7
-        vst1.32         {d3[0]},  [r1], r4
-        subs            r12, r12, #12
-        bgt             1b
-
-        pop             {r4,pc}
-endfunc
-
-.macro  paeth           rx,  ra,  rb,  rc
-        vaddl.u8        q12, \ra, \rb           @ a + b
-        vaddl.u8        q15, \rc, \rc           @ 2*c
-        vabdl.u8        q13, \rb, \rc           @ pa
-        vabdl.u8        q14, \ra, \rc           @ pb
-        vabd.u16        q15, q12, q15           @ pc
-        vcle.u16        q12, q13, q14           @ pa <= pb
-        vcle.u16        q13, q13, q15           @ pa <= pc
-        vcle.u16        q14, q14, q15           @ pb <= pc
-        vand            q12, q12, q13           @ pa <= pb && pa <= pc
-        vmovn.u16       d28, q14
-        vmovn.u16       \rx, q12
-        vbsl            d28, \rb, \rc
-        vbsl            \rx, \ra, d28
-.endm
-
-func    png_read_filter_row_paeth4_neon, export=1
-        ldr             r12, [r0, #4]           @ rowbytes
-        vmov.i8         d3,  #0
-        vmov.i8         d20, #0
-1:
-        vld4.32         {d4[],d5[],d6[],d7[]},    [r1,:128]
-        vld4.32         {d16[],d17[],d18[],d19[]},[r2,:128]!
-        paeth           d0,  d3,  d16, d20
-        vadd.u8         d0,  d0,  d4
-        paeth           d1,  d0,  d17, d16
-        vadd.u8         d1,  d1,  d5
-        paeth           d2,  d1,  d18, d17
-        vadd.u8         d2,  d2,  d6
-        paeth           d3,  d2,  d19, d18
-        vmov            d20, d19
-        vadd.u8         d3,  d3,  d7
-        vst4.32         {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
-        subs            r12, r12, #16
-        bgt             1b
-
-        bx              lr
-endfunc
-
-func    png_read_filter_row_paeth3_neon, export=1
-        push            {r4,lr}
-        ldr             r12, [r0, #4]           @ rowbytes
-        vmov.i8         d3,  #0
-        vmov.i8         d4,  #0
-        mov             r0,  r1
-        mov             r4,  #3
-        mov             lr,  #12
-        vld1.8          {q11},    [r0], lr
-1:
-        vld1.8          {q10},    [r2], lr
-        paeth           d0,  d3,  d20, d4
-        vext.8          d5,  d22, d23, #3
-        vadd.u8         d0,  d0,  d22
-        vext.8          d17, d20, d21, #3
-        paeth           d1,  d0,  d17, d20
-        vst1.32         {d0[0]},  [r1,:32], r4
-        vext.8          d6,  d22, d23, #6
-        vadd.u8         d1,  d1,  d5
-        vext.8          d18, d20, d21, #6
-        paeth           d2,  d1,  d18, d17
-        vext.8          d7,  d23, d23, #1
-        vld1.8          {q11},    [r0], lr
-        vst1.32         {d1[0]},  [r1], r4
-        vadd.u8         d2,  d2,  d6
-        vext.8          d19, d21, d21, #1
-        paeth           d3,  d2,  d19, d18
-        vst1.32         {d2[0]},  [r1], r4
-        vmov            d4,  d19
-        vadd.u8         d3,  d3,  d7
-        vst1.32         {d3[0]},  [r1], r4
-        subs            r12, r12, #12
-        bgt             1b
-
-        pop             {r4,pc}
-endfunc
-#endif /* PNG_ARM_NEON_OPT > 0 */
-#endif /* PNG_ARM_NEON_IMPLEMENTATION == 2 (assembler) */
-#endif /* READ */
diff --git a/src/png/libpng/arm/filter_neon_intrinsics.c b/src/png/libpng/arm/filter_neon_intrinsics.c
deleted file mode 100644
index ea7e356bc..000000000
--- a/src/png/libpng/arm/filter_neon_intrinsics.c
+++ /dev/null
@@ -1,387 +0,0 @@
-
-/* filter_neon_intrinsics.c - NEON optimised filter functions
- *
- * Copyright (c) 2014,2016 Glenn Randers-Pehrson
- * Written by James Yu <james.yu at linaro.org>, October 2013.
- * Based on filter_neon.S, written by Mans Rullgard, 2011.
- *
- * Last changed in libpng 1.6.22 [May 26, 2016]
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#include "../pngpriv.h"
-
-#ifdef PNG_READ_SUPPORTED
-
-/* This code requires -mfpu=neon on the command line: */
-#if PNG_ARM_NEON_IMPLEMENTATION == 1 /* intrinsics code from pngpriv.h */
-
-#include <arm_neon.h>
-
-/* libpng row pointers are not necessarily aligned to any particular boundary,
- * however this code will only work with appropriate alignment.  arm/arm_init.c
- * checks for this (and will not compile unless it is done). This code uses
- * variants of png_aligncast to avoid compiler warnings.
- */
-#define png_ptr(type,pointer) png_aligncast(type *,pointer)
-#define png_ptrc(type,pointer) png_aligncastconst(const type *,pointer)
-
-/* The following relies on a variable 'temp_pointer' being declared with type
- * 'type'.  This is written this way just to hide the GCC strict aliasing
- * warning; note that the code is safe because there never is an alias between
- * the input and output pointers.
- */
-#define png_ldr(type,pointer)\
-   (temp_pointer = png_ptr(type,pointer), *temp_pointer)
-
-#if PNG_ARM_NEON_OPT > 0
-
-void
-png_read_filter_row_up_neon(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev_row)
-{
-   png_bytep rp = row;
-   png_bytep rp_stop = row + row_info->rowbytes;
-   png_const_bytep pp = prev_row;
-
-   png_debug(1, "in png_read_filter_row_up_neon");
-
-   for (; rp < rp_stop; rp += 16, pp += 16)
-   {
-      uint8x16_t qrp, qpp;
-
-      qrp = vld1q_u8(rp);
-      qpp = vld1q_u8(pp);
-      qrp = vaddq_u8(qrp, qpp);
-      vst1q_u8(rp, qrp);
-   }
-}
-
-void
-png_read_filter_row_sub3_neon(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev_row)
-{
-   png_bytep rp = row;
-   png_bytep rp_stop = row + row_info->rowbytes;
-
-   uint8x16_t vtmp = vld1q_u8(rp);
-   uint8x8x2_t *vrpt = png_ptr(uint8x8x2_t, &vtmp);
-   uint8x8x2_t vrp = *vrpt;
-
-   uint8x8x4_t vdest;
-   vdest.val[3] = vdup_n_u8(0);
-
-   png_debug(1, "in png_read_filter_row_sub3_neon");
-
-   for (; rp < rp_stop;)
-   {
-      uint8x8_t vtmp1, vtmp2;
-      uint32x2_t *temp_pointer;
-
-      vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3);
-      vdest.val[0] = vadd_u8(vdest.val[3], vrp.val[0]);
-      vtmp2 = vext_u8(vrp.val[0], vrp.val[1], 6);
-      vdest.val[1] = vadd_u8(vdest.val[0], vtmp1);
-
-      vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1);
-      vdest.val[2] = vadd_u8(vdest.val[1], vtmp2);
-      vdest.val[3] = vadd_u8(vdest.val[2], vtmp1);
-
-      vtmp = vld1q_u8(rp + 12);
-      vrpt = png_ptr(uint8x8x2_t, &vtmp);
-      vrp = *vrpt;
-
-      vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0);
-      rp += 3;
-      vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0);
-      rp += 3;
-      vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0);
-      rp += 3;
-      vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0);
-      rp += 3;
-   }
-
-   PNG_UNUSED(prev_row)
-}
-
-void
-png_read_filter_row_sub4_neon(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev_row)
-{
-   png_bytep rp = row;
-   png_bytep rp_stop = row + row_info->rowbytes;
-
-   uint8x8x4_t vdest;
-   vdest.val[3] = vdup_n_u8(0);
-
-   png_debug(1, "in png_read_filter_row_sub4_neon");
-
-   for (; rp < rp_stop; rp += 16)
-   {
-      uint32x2x4_t vtmp = vld4_u32(png_ptr(uint32_t,rp));
-      uint8x8x4_t *vrpt = png_ptr(uint8x8x4_t,&vtmp);
-      uint8x8x4_t vrp = *vrpt;
-      uint32x2x4_t *temp_pointer;
-
-      vdest.val[0] = vadd_u8(vdest.val[3], vrp.val[0]);
-      vdest.val[1] = vadd_u8(vdest.val[0], vrp.val[1]);
-      vdest.val[2] = vadd_u8(vdest.val[1], vrp.val[2]);
-      vdest.val[3] = vadd_u8(vdest.val[2], vrp.val[3]);
-      vst4_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2x4_t,&vdest), 0);
-   }
-
-   PNG_UNUSED(prev_row)
-}
-
-void
-png_read_filter_row_avg3_neon(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev_row)
-{
-   png_bytep rp = row;
-   png_const_bytep pp = prev_row;
-   png_bytep rp_stop = row + row_info->rowbytes;
-
-   uint8x16_t vtmp;
-   uint8x8x2_t *vrpt;
-   uint8x8x2_t vrp;
-   uint8x8x4_t vdest;
-   vdest.val[3] = vdup_n_u8(0);
-
-   vtmp = vld1q_u8(rp);
-   vrpt = png_ptr(uint8x8x2_t,&vtmp);
-   vrp = *vrpt;
-
-   png_debug(1, "in png_read_filter_row_avg3_neon");
-
-   for (; rp < rp_stop; pp += 12)
-   {
-      uint8x8_t vtmp1, vtmp2, vtmp3;
-
-      uint8x8x2_t *vppt;
-      uint8x8x2_t vpp;
-
-      uint32x2_t *temp_pointer;
-
-      vtmp = vld1q_u8(pp);
-      vppt = png_ptr(uint8x8x2_t,&vtmp);
-      vpp = *vppt;
-
-      vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3);
-      vdest.val[0] = vhadd_u8(vdest.val[3], vpp.val[0]);
-      vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
-
-      vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 3);
-      vtmp3 = vext_u8(vrp.val[0], vrp.val[1], 6);
-      vdest.val[1] = vhadd_u8(vdest.val[0], vtmp2);
-      vdest.val[1] = vadd_u8(vdest.val[1], vtmp1);
-
-      vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 6);
-      vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1);
-
-      vtmp = vld1q_u8(rp + 12);
-      vrpt = png_ptr(uint8x8x2_t,&vtmp);
-      vrp = *vrpt;
-
-      vdest.val[2] = vhadd_u8(vdest.val[1], vtmp2);
-      vdest.val[2] = vadd_u8(vdest.val[2], vtmp3);
-
-      vtmp2 = vext_u8(vpp.val[1], vpp.val[1], 1);
-
-      vdest.val[3] = vhadd_u8(vdest.val[2], vtmp2);
-      vdest.val[3] = vadd_u8(vdest.val[3], vtmp1);
-
-      vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0);
-      rp += 3;
-      vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0);
-      rp += 3;
-      vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0);
-      rp += 3;
-      vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0);
-      rp += 3;
-   }
-}
-
-void
-png_read_filter_row_avg4_neon(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev_row)
-{
-   png_bytep rp = row;
-   png_bytep rp_stop = row + row_info->rowbytes;
-   png_const_bytep pp = prev_row;
-
-   uint8x8x4_t vdest;
-   vdest.val[3] = vdup_n_u8(0);
-
-   png_debug(1, "in png_read_filter_row_avg4_neon");
-
-   for (; rp < rp_stop; rp += 16, pp += 16)
-   {
-      uint32x2x4_t vtmp;
-      uint8x8x4_t *vrpt, *vppt;
-      uint8x8x4_t vrp, vpp;
-      uint32x2x4_t *temp_pointer;
-
-      vtmp = vld4_u32(png_ptr(uint32_t,rp));
-      vrpt = png_ptr(uint8x8x4_t,&vtmp);
-      vrp = *vrpt;
-      vtmp = vld4_u32(png_ptrc(uint32_t,pp));
-      vppt = png_ptr(uint8x8x4_t,&vtmp);
-      vpp = *vppt;
-
-      vdest.val[0] = vhadd_u8(vdest.val[3], vpp.val[0]);
-      vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
-      vdest.val[1] = vhadd_u8(vdest.val[0], vpp.val[1]);
-      vdest.val[1] = vadd_u8(vdest.val[1], vrp.val[1]);
-      vdest.val[2] = vhadd_u8(vdest.val[1], vpp.val[2]);
-      vdest.val[2] = vadd_u8(vdest.val[2], vrp.val[2]);
-      vdest.val[3] = vhadd_u8(vdest.val[2], vpp.val[3]);
-      vdest.val[3] = vadd_u8(vdest.val[3], vrp.val[3]);
-
-      vst4_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2x4_t,&vdest), 0);
-   }
-}
-
-static uint8x8_t
-paeth(uint8x8_t a, uint8x8_t b, uint8x8_t c)
-{
-   uint8x8_t d, e;
-   uint16x8_t p1, pa, pb, pc;
-
-   p1 = vaddl_u8(a, b); /* a + b */
-   pc = vaddl_u8(c, c); /* c * 2 */
-   pa = vabdl_u8(b, c); /* pa */
-   pb = vabdl_u8(a, c); /* pb */
-   pc = vabdq_u16(p1, pc); /* pc */
-
-   p1 = vcleq_u16(pa, pb); /* pa <= pb */
-   pa = vcleq_u16(pa, pc); /* pa <= pc */
-   pb = vcleq_u16(pb, pc); /* pb <= pc */
-
-   p1 = vandq_u16(p1, pa); /* pa <= pb && pa <= pc */
-
-   d = vmovn_u16(pb);
-   e = vmovn_u16(p1);
-
-   d = vbsl_u8(d, b, c);
-   e = vbsl_u8(e, a, d);
-
-   return e;
-}
-
-void
-png_read_filter_row_paeth3_neon(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev_row)
-{
-   png_bytep rp = row;
-   png_const_bytep pp = prev_row;
-   png_bytep rp_stop = row + row_info->rowbytes;
-
-   uint8x16_t vtmp;
-   uint8x8x2_t *vrpt;
-   uint8x8x2_t vrp;
-   uint8x8_t vlast = vdup_n_u8(0);
-   uint8x8x4_t vdest;
-   vdest.val[3] = vdup_n_u8(0);
-
-   vtmp = vld1q_u8(rp);
-   vrpt = png_ptr(uint8x8x2_t,&vtmp);
-   vrp = *vrpt;
-
-   png_debug(1, "in png_read_filter_row_paeth3_neon");
-
-   for (; rp < rp_stop; pp += 12)
-   {
-      uint8x8x2_t *vppt;
-      uint8x8x2_t vpp;
-      uint8x8_t vtmp1, vtmp2, vtmp3;
-      uint32x2_t *temp_pointer;
-
-      vtmp = vld1q_u8(pp);
-      vppt = png_ptr(uint8x8x2_t,&vtmp);
-      vpp = *vppt;
-
-      vdest.val[0] = paeth(vdest.val[3], vpp.val[0], vlast);
-      vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
-
-      vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3);
-      vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 3);
-      vdest.val[1] = paeth(vdest.val[0], vtmp2, vpp.val[0]);
-      vdest.val[1] = vadd_u8(vdest.val[1], vtmp1);
-
-      vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 6);
-      vtmp3 = vext_u8(vpp.val[0], vpp.val[1], 6);
-      vdest.val[2] = paeth(vdest.val[1], vtmp3, vtmp2);
-      vdest.val[2] = vadd_u8(vdest.val[2], vtmp1);
-
-      vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1);
-      vtmp2 = vext_u8(vpp.val[1], vpp.val[1], 1);
-
-      vtmp = vld1q_u8(rp + 12);
-      vrpt = png_ptr(uint8x8x2_t,&vtmp);
-      vrp = *vrpt;
-
-      vdest.val[3] = paeth(vdest.val[2], vtmp2, vtmp3);
-      vdest.val[3] = vadd_u8(vdest.val[3], vtmp1);
-
-      vlast = vtmp2;
-
-      vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0);
-      rp += 3;
-      vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0);
-      rp += 3;
-      vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0);
-      rp += 3;
-      vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0);
-      rp += 3;
-   }
-}
-
-void
-png_read_filter_row_paeth4_neon(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev_row)
-{
-   png_bytep rp = row;
-   png_bytep rp_stop = row + row_info->rowbytes;
-   png_const_bytep pp = prev_row;
-
-   uint8x8_t vlast = vdup_n_u8(0);
-   uint8x8x4_t vdest;
-   vdest.val[3] = vdup_n_u8(0);
-
-   png_debug(1, "in png_read_filter_row_paeth4_neon");
-
-   for (; rp < rp_stop; rp += 16, pp += 16)
-   {
-      uint32x2x4_t vtmp;
-      uint8x8x4_t *vrpt, *vppt;
-      uint8x8x4_t vrp, vpp;
-      uint32x2x4_t *temp_pointer;
-
-      vtmp = vld4_u32(png_ptr(uint32_t,rp));
-      vrpt = png_ptr(uint8x8x4_t,&vtmp);
-      vrp = *vrpt;
-      vtmp = vld4_u32(png_ptrc(uint32_t,pp));
-      vppt = png_ptr(uint8x8x4_t,&vtmp);
-      vpp = *vppt;
-
-      vdest.val[0] = paeth(vdest.val[3], vpp.val[0], vlast);
-      vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
-      vdest.val[1] = paeth(vdest.val[0], vpp.val[1], vpp.val[0]);
-      vdest.val[1] = vadd_u8(vdest.val[1], vrp.val[1]);
-      vdest.val[2] = paeth(vdest.val[1], vpp.val[2], vpp.val[1]);
-      vdest.val[2] = vadd_u8(vdest.val[2], vrp.val[2]);
-      vdest.val[3] = paeth(vdest.val[2], vpp.val[3], vpp.val[2]);
-      vdest.val[3] = vadd_u8(vdest.val[3], vrp.val[3]);
-
-      vlast = vpp.val[3];
-
-      vst4_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2x4_t,&vdest), 0);
-   }
-}
-
-#endif /* PNG_ARM_NEON_OPT > 0 */
-#endif /* PNG_ARM_NEON_IMPLEMENTATION == 1 (intrinsics) */
-#endif /* READ */
diff --git a/src/png/libpng/intel/filter_sse2_intrinsics.c b/src/png/libpng/intel/filter_sse2_intrinsics.c
deleted file mode 100644
index 5e8553fbb..000000000
--- a/src/png/libpng/intel/filter_sse2_intrinsics.c
+++ /dev/null
@@ -1,406 +0,0 @@
-
-/* filter_sse2_intrinsics.c - SSE2 optimized filter functions
- *
- * Copyright (c) 2016-2017 Glenn Randers-Pehrson
- * Written by Mike Klein and Matt Sarett
- * Derived from arm/filter_neon_intrinsics.c
- *
- * Last changed in libpng 1.6.31 [July 27, 2017]
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#include "../pngpriv.h"
-
-#ifdef PNG_READ_SUPPORTED
-
-#if PNG_INTEL_SSE_IMPLEMENTATION > 0
-
-#include <immintrin.h>
-
-/* Functions in this file look at most 3 pixels (a,b,c) to predict the 4th (d).
- * They're positioned like this:
- *    prev:  c b
- *    row:   a d
- * The Sub filter predicts d=a, Avg d=(a+b)/2, and Paeth predicts d to be
- * whichever of a, b, or c is closest to p=a+b-c.
- */
-
-static __m128i load4(const void* p) {
-   return _mm_cvtsi32_si128(*(const int*)p);
-}
-
-static void store4(void* p, __m128i v) {
-   *(int*)p = _mm_cvtsi128_si32(v);
-}
-
-static __m128i load3(const void* p) {
-   /* We'll load 2 bytes, then 1 byte,
-    * then mask them together, and finally load into SSE.
-    */
-   const png_uint_16* p01 = (png_const_uint_16p)p;
-   const png_byte*    p2  = (const png_byte*)(p01+1);
-
-   png_uint_32 v012 = (png_uint_32)(*p01)
-                    | (png_uint_32)(*p2) << 16;
-   return load4(&v012);
-}
-
-static void store3(void* p, __m128i v) {
-   /* We'll pull from SSE as a 32-bit int, then write
-    * its bottom two bytes, then its third byte.
-    */
-   png_uint_32 v012;
-   png_uint_16* p01;
-   png_byte*    p2;
-
-   store4(&v012, v);
-
-   p01 = (png_uint_16p)p;
-   p2  = (png_byte*)(p01+1);
-   *p01 = (png_uint_16)v012;
-   *p2  = (png_byte)(v012 >> 16);
-}
-
-void png_read_filter_row_sub3_sse2(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev)
-{
-   /* The Sub filter predicts each pixel as the previous pixel, a.
-    * There is no pixel to the left of the first pixel.  It's encoded directly.
-    * That works with our main loop if we just say that left pixel was zero.
-    */
-   png_size_t rb;
-
-   __m128i a, d = _mm_setzero_si128();
-
-   png_debug(1, "in png_read_filter_row_sub3_sse2");
-
-   rb = row_info->rowbytes;
-   while (rb >= 4) {
-      a = d; d = load4(row);
-      d = _mm_add_epi8(d, a);
-      store3(row, d);
-
-      row += 3;
-      rb  -= 3;
-   }
-   if (rb > 0) {
-      a = d; d = load3(row);
-      d = _mm_add_epi8(d, a);
-      store3(row, d);
-
-      row += 3;
-      rb  -= 3;
-   }
-   PNG_UNUSED(prev)
-}
-
-void png_read_filter_row_sub4_sse2(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev)
-{
-   /* The Sub filter predicts each pixel as the previous pixel, a.
-    * There is no pixel to the left of the first pixel.  It's encoded directly.
-    * That works with our main loop if we just say that left pixel was zero.
-    */
-   png_size_t rb;
-
-   __m128i a, d = _mm_setzero_si128();
-
-   png_debug(1, "in png_read_filter_row_sub4_sse2");
-
-   rb = row_info->rowbytes+4;
-   while (rb > 4) {
-      a = d; d = load4(row);
-      d = _mm_add_epi8(d, a);
-      store4(row, d);
-
-      row += 4;
-      rb  -= 4;
-   }
-   PNG_UNUSED(prev)
-}
-
-void png_read_filter_row_avg3_sse2(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev)
-{
-   /* The Avg filter predicts each pixel as the (truncated) average of a and b.
-    * There's no pixel to the left of the first pixel.  Luckily, it's
-    * predicted to be half of the pixel above it.  So again, this works
-    * perfectly with our loop if we make sure a starts at zero.
-    */
-
-   png_size_t rb;
-
-   const __m128i zero = _mm_setzero_si128();
-
-   __m128i    b;
-   __m128i a, d = zero;
-
-   png_debug(1, "in png_read_filter_row_avg3_sse2");
-   rb = row_info->rowbytes;
-   while (rb >= 4) {
-      __m128i avg;
-             b = load4(prev);
-      a = d; d = load4(row );
-
-      /* PNG requires a truncating average, so we can't just use _mm_avg_epu8 */
-      avg = _mm_avg_epu8(a,b);
-      /* ...but we can fix it up by subtracting off 1 if it rounded up. */
-      avg = _mm_sub_epi8(avg, _mm_and_si128(_mm_xor_si128(a,b),
-                                            _mm_set1_epi8(1)));
-      d = _mm_add_epi8(d, avg);
-      store3(row, d);
-
-      prev += 3;
-      row  += 3;
-      rb   -= 3;
-   }
-   if (rb > 0) {
-      __m128i avg;
-             b = load3(prev);
-      a = d; d = load3(row );
-
-      /* PNG requires a truncating average, so we can't just use _mm_avg_epu8 */
-      avg = _mm_avg_epu8(a,b);
-      /* ...but we can fix it up by subtracting off 1 if it rounded up. */
-      avg = _mm_sub_epi8(avg, _mm_and_si128(_mm_xor_si128(a,b),
-                                            _mm_set1_epi8(1)));
-
-      d = _mm_add_epi8(d, avg);
-      store3(row, d);
-
-      prev += 3;
-      row  += 3;
-      rb   -= 3;
-   }
-}
-
-void png_read_filter_row_avg4_sse2(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev)
-{
-   /* The Avg filter predicts each pixel as the (truncated) average of a and b.
-    * There's no pixel to the left of the first pixel.  Luckily, it's
-    * predicted to be half of the pixel above it.  So again, this works
-    * perfectly with our loop if we make sure a starts at zero.
-    */
-   png_size_t rb;
-   const __m128i zero = _mm_setzero_si128();
-   __m128i    b;
-   __m128i a, d = zero;
-
-   png_debug(1, "in png_read_filter_row_avg4_sse2");
-
-   rb = row_info->rowbytes+4;
-   while (rb > 4) {
-      __m128i avg;
-             b = load4(prev);
-      a = d; d = load4(row );
-
-      /* PNG requires a truncating average, so we can't just use _mm_avg_epu8 */
-      avg = _mm_avg_epu8(a,b);
-      /* ...but we can fix it up by subtracting off 1 if it rounded up. */
-      avg = _mm_sub_epi8(avg, _mm_and_si128(_mm_xor_si128(a,b),
-                                            _mm_set1_epi8(1)));
-
-      d = _mm_add_epi8(d, avg);
-      store4(row, d);
-
-      prev += 4;
-      row  += 4;
-      rb   -= 4;
-   }
-}
-
-/* Returns |x| for 16-bit lanes. */
-static __m128i abs_i16(__m128i x) {
-#if PNG_INTEL_SSE_IMPLEMENTATION >= 2
-   return _mm_abs_epi16(x);
-#else
-   /* Read this all as, return x<0 ? -x : x.
-   * To negate two's complement, you flip all the bits then add 1.
-    */
-   __m128i is_negative = _mm_cmplt_epi16(x, _mm_setzero_si128());
-
-   /* Flip negative lanes. */
-   x = _mm_xor_si128(x, is_negative);
-
-   /* +1 to negative lanes, else +0. */
-   x = _mm_sub_epi16(x, is_negative);
-   return x;
-#endif
-}
-
-/* Bytewise c ? t : e. */
-static __m128i if_then_else(__m128i c, __m128i t, __m128i e) {
-#if PNG_INTEL_SSE_IMPLEMENTATION >= 3
-   return _mm_blendv_epi8(e,t,c);
-#else
-   return _mm_or_si128(_mm_and_si128(c, t), _mm_andnot_si128(c, e));
-#endif
-}
-
-void png_read_filter_row_paeth3_sse2(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev)
-{
-   /* Paeth tries to predict pixel d using the pixel to the left of it, a,
-    * and two pixels from the previous row, b and c:
-    *   prev: c b
-    *   row:  a d
-    * The Paeth function predicts d to be whichever of a, b, or c is nearest to
-    * p=a+b-c.
-    *
-    * The first pixel has no left context, and so uses an Up filter, p = b.
-    * This works naturally with our main loop's p = a+b-c if we force a and c
-    * to zero.
-    * Here we zero b and d, which become c and a respectively at the start of
-    * the loop.
-    */
-   png_size_t rb;
-   const __m128i zero = _mm_setzero_si128();
-   __m128i c, b = zero,
-           a, d = zero;
-
-   png_debug(1, "in png_read_filter_row_paeth3_sse2");
-
-   rb = row_info->rowbytes;
-   while (rb >= 4) {
-      /* It's easiest to do this math (particularly, deal with pc) with 16-bit
-       * intermediates.
-       */
-      __m128i pa,pb,pc,smallest,nearest;
-      c = b; b = _mm_unpacklo_epi8(load4(prev), zero);
-      a = d; d = _mm_unpacklo_epi8(load4(row ), zero);
-
-      /* (p-a) == (a+b-c - a) == (b-c) */
-   
-      pa = _mm_sub_epi16(b,c);
-
-      /* (p-b) == (a+b-c - b) == (a-c) */
-      pb = _mm_sub_epi16(a,c);
-
-      /* (p-c) == (a+b-c - c) == (a+b-c-c) == (b-c)+(a-c) */
-      pc = _mm_add_epi16(pa,pb);
-
-      pa = abs_i16(pa);  /* |p-a| */
-      pb = abs_i16(pb);  /* |p-b| */
-      pc = abs_i16(pc);  /* |p-c| */
-
-      smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb));
-
-      /* Paeth breaks ties favoring a over b over c. */
-      nearest  = if_then_else(_mm_cmpeq_epi16(smallest, pa), a,
-                 if_then_else(_mm_cmpeq_epi16(smallest, pb), b,
-                                                             c));
-
-      /* Note `_epi8`: we need addition to wrap modulo 255. */
-      d = _mm_add_epi8(d, nearest);
-      store3(row, _mm_packus_epi16(d,d));
-
-      prev += 3;
-      row  += 3;
-      rb   -= 3;
-   }
-   if (rb > 0) {
-      /* It's easiest to do this math (particularly, deal with pc) with 16-bit
-       * intermediates.
-       */
-      __m128i pa,pb,pc,smallest,nearest;
-      c = b; b = _mm_unpacklo_epi8(load3(prev), zero);
-      a = d; d = _mm_unpacklo_epi8(load3(row ), zero);
-
-      /* (p-a) == (a+b-c - a) == (b-c) */
-      pa = _mm_sub_epi16(b,c);
-
-      /* (p-b) == (a+b-c - b) == (a-c) */
-      pb = _mm_sub_epi16(a,c);
-
-      /* (p-c) == (a+b-c - c) == (a+b-c-c) == (b-c)+(a-c) */
-      pc = _mm_add_epi16(pa,pb);
-
-      pa = abs_i16(pa);  /* |p-a| */
-      pb = abs_i16(pb);  /* |p-b| */
-      pc = abs_i16(pc);  /* |p-c| */
-
-      smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb));
-
-      /* Paeth breaks ties favoring a over b over c. */
-      nearest  = if_then_else(_mm_cmpeq_epi16(smallest, pa), a,
-                         if_then_else(_mm_cmpeq_epi16(smallest, pb), b,
-                                                                     c));
-
-      /* Note `_epi8`: we need addition to wrap modulo 255. */
-      d = _mm_add_epi8(d, nearest);
-      store3(row, _mm_packus_epi16(d,d));
-
-      prev += 3;
-      row  += 3;
-      rb   -= 3;
-   }
-}
-
-void png_read_filter_row_paeth4_sse2(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev)
-{
-   /* Paeth tries to predict pixel d using the pixel to the left of it, a,
-    * and two pixels from the previous row, b and c:
-    *   prev: c b
-    *   row:  a d
-    * The Paeth function predicts d to be whichever of a, b, or c is nearest to
-    * p=a+b-c.
-    *
-    * The first pixel has no left context, and so uses an Up filter, p = b.
-    * This works naturally with our main loop's p = a+b-c if we force a and c
-    * to zero.
-    * Here we zero b and d, which become c and a respectively at the start of
-    * the loop.
-    */
-   png_size_t rb;
-   const __m128i zero = _mm_setzero_si128();
-   __m128i pa,pb,pc,smallest,nearest;
-   __m128i c, b = zero,
-           a, d = zero;
-
-   png_debug(1, "in png_read_filter_row_paeth4_sse2");
-
-   rb = row_info->rowbytes+4;
-   while (rb > 4) {
-      /* It's easiest to do this math (particularly, deal with pc) with 16-bit
-       * intermediates.
-       */
-      c = b; b = _mm_unpacklo_epi8(load4(prev), zero);
-      a = d; d = _mm_unpacklo_epi8(load4(row ), zero);
-
-      /* (p-a) == (a+b-c - a) == (b-c) */
-      pa = _mm_sub_epi16(b,c);
-
-      /* (p-b) == (a+b-c - b) == (a-c) */
-      pb = _mm_sub_epi16(a,c);
-
-      /* (p-c) == (a+b-c - c) == (a+b-c-c) == (b-c)+(a-c) */
-      pc = _mm_add_epi16(pa,pb);
-
-      pa = abs_i16(pa);  /* |p-a| */
-      pb = abs_i16(pb);  /* |p-b| */
-      pc = abs_i16(pc);  /* |p-c| */
-
-      smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb));
-
-      /* Paeth breaks ties favoring a over b over c. */
-      nearest  = if_then_else(_mm_cmpeq_epi16(smallest, pa), a,
-                         if_then_else(_mm_cmpeq_epi16(smallest, pb), b,
-                                                                     c));
-
-      /* Note `_epi8`: we need addition to wrap modulo 255. */
-      d = _mm_add_epi8(d, nearest);
-      store4(row, _mm_packus_epi16(d,d));
-
-      prev += 4;
-      row  += 4;
-      rb   -= 4;
-   }
-}
-
-#endif /* PNG_INTEL_SSE_IMPLEMENTATION > 0 */
-#endif /* READ */
diff --git a/src/png/libpng/intel/intel_init.c b/src/png/libpng/intel/intel_init.c
deleted file mode 100644
index 8f08baf8c..000000000
--- a/src/png/libpng/intel/intel_init.c
+++ /dev/null
@@ -1,53 +0,0 @@
-
-/* intel_init.c - SSE2 optimized filter functions
- *
- * Copyright (c) 2016-2017 Glenn Randers-Pehrson
- * Written by Mike Klein and Matt Sarett, Google, Inc.
- * Derived from arm/arm_init.c
- *
- * Last changed in libpng 1.6.29 [March 16, 2017]
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#include "../pngpriv.h"
-
-#ifdef PNG_READ_SUPPORTED
-#if PNG_INTEL_SSE_IMPLEMENTATION > 0
-
-void
-png_init_filter_functions_sse2(png_structp pp, unsigned int bpp)
-{
-   /* The techniques used to implement each of these filters in SSE operate on
-    * one pixel at a time.
-    * So they generally speed up 3bpp images about 3x, 4bpp images about 4x.
-    * They can scale up to 6 and 8 bpp images and down to 2 bpp images,
-    * but they'd not likely have any benefit for 1bpp images.
-    * Most of these can be implemented using only MMX and 64-bit registers,
-    * but they end up a bit slower than using the equally-ubiquitous SSE2.
-   */
-   png_debug(1, "in png_init_filter_functions_sse2");
-   if (bpp == 3)
-   {
-      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_sse2;
-      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_sse2;
-      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
-         png_read_filter_row_paeth3_sse2;
-   }
-   else if (bpp == 4)
-   {
-      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_sse2;
-      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_sse2;
-      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
-          png_read_filter_row_paeth4_sse2;
-   }
-
-   /* No need optimize PNG_FILTER_VALUE_UP.  The compiler should
-    * autovectorize.
-    */
-}
-
-#endif /* PNG_INTEL_SSE_IMPLEMENTATION > 0 */
-#endif /* PNG_READ_SUPPORTED */
diff --git a/src/png/libpng/libpng-config.in b/src/png/libpng/libpng-config.in
deleted file mode 100644
index 69bf8e33f..000000000
--- a/src/png/libpng/libpng-config.in
+++ /dev/null
@@ -1,127 +0,0 @@
-#! /bin/sh
-
-# libpng-config
-# provides configuration info for libpng.
-
-# Copyright (C) 2002, 2004, 2006, 2007 Glenn Randers-Pehrson
-
-# This code is released under the libpng license.
-# For conditions of distribution and use, see the disclaimer
-# and license in png.h
-
-# Modeled after libxml-config.
-
-version="@PNGLIB_VERSION@"
-prefix="@prefix@"
-exec_prefix="@exec_prefix@"
-libdir="@libdir@"
-includedir="@includedir@/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@"
-libs="-lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@"
-all_libs="-lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@ @LIBS@"
-I_opts="-I${includedir}"
-L_opts="-L${libdir}"
-R_opts=""
-cppflags=""
-ccopts=""
-ldopts=""
-
-usage()
-{
-    cat <<EOF
-Usage: $0 [OPTION] ...
-
-Known values for OPTION are:
-
-  --prefix        print libpng prefix
-  --libdir        print path to directory containing library
-  --libs          print library linking information
-  --ccopts        print compiler options
-  --cppflags      print pre-processor flags
-  --cflags        print preprocessor flags, I_opts, and compiler options
-  --I_opts        print "-I" include options
-  --L_opts        print linker "-L" flags for dynamic linking
-  --R_opts        print dynamic linker "-R" or "-rpath" flags
-  --ldopts        print linker options
-  --ldflags       print linker flags (ldopts, L_opts, R_opts, and libs)
-  --static        revise subsequent outputs for static linking
-  --help          print this help and exit
-  --version       print version information
-EOF
-
-    exit $1
-}
-
-if test $# -eq 0; then
-    usage 1
-fi
-
-while test $# -gt 0; do
-    case "$1" in
-
-    --prefix)
-        echo ${prefix}
-        ;;
-
-    --version)
-        echo ${version}
-        exit 0
-        ;;
-
-    --help)
-        usage 0
-        ;;
-
-    --ccopts)
-        echo ${ccopts}
-        ;;
-
-    --cppflags)
-        echo ${cppflags}
-        ;;
-
-    --cflags)
-        echo ${I_opts} ${cppflags} ${ccopts}
-        ;;
-
-    --libdir)
-        echo ${libdir}
-        ;;
-
-    --libs)
-        echo ${libs}
-        ;;
-
-    --I_opts)
-        echo ${I_opts}
-        ;;
-
-    --L_opts)
-        echo ${L_opts}
-        ;;
-
-    --R_opts)
-        echo ${R_opts}
-        ;;
-
-    --ldopts)
-        echo ${ldopts}
-        ;;
-
-    --ldflags)
-        echo ${ldopts} ${L_opts} ${R_opts} ${libs}
-        ;;
-
-    --static)
-        R_opts=""
-        libs=${all_libs}
-        ;;
-
-    *)
-        usage
-        exit 1
-        ;;
-    esac
-    shift
-done
-
-exit 0
diff --git a/src/png/libpng/libpng.pc.in b/src/png/libpng/libpng.pc.in
deleted file mode 100644
index 9708e9af2..000000000
--- a/src/png/libpng/libpng.pc.in
+++ /dev/null
@@ -1,12 +0,0 @@
-prefix=@prefix@
-exec_prefix=@exec_prefix@
-libdir=@libdir@
-includedir=@includedir@/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@
-
-Name: libpng
-Description: Loads and saves PNG files
-Version: @PNGLIB_VERSION@
-Requires: zlib
-Libs: -L${libdir} -lpng@PNGLIB_MAJOR@@PNGLIB_MINOR@
-Libs.private: @LIBS@
-Cflags: -I${includedir}
diff --git a/src/png/libpng/mips/filter_msa_intrinsics.c b/src/png/libpng/mips/filter_msa_intrinsics.c
deleted file mode 100644
index 943bb3d05..000000000
--- a/src/png/libpng/mips/filter_msa_intrinsics.c
+++ /dev/null
@@ -1,807 +0,0 @@
-
-/* filter_msa_intrinsics.c - MSA optimised filter functions
- *
- * Copyright (c) 2016 Glenn Randers-Pehrson
- * Written by Mandar Sahastrabuddhe, August 2016.
- * Last changed in libpng 1.6.25 [September 1, 2016]
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-#include <stdio.h>
-#include <stdint.h>
-#include "../pngpriv.h"
-
-#ifdef PNG_READ_SUPPORTED
-
-/* This code requires -mfpu=msa on the command line: */
-#if PNG_MIPS_MSA_IMPLEMENTATION == 1 /* intrinsics code from pngpriv.h */
-
-#include <msa.h>
-
-/* libpng row pointers are not necessarily aligned to any particular boundary,
- * however this code will only work with appropriate alignment. mips/mips_init.c
- * checks for this (and will not compile unless it is done). This code uses
- * variants of png_aligncast to avoid compiler warnings.
- */
-#define png_ptr(type,pointer) png_aligncast(type *,pointer)
-#define png_ptrc(type,pointer) png_aligncastconst(const type *,pointer)
-
-/* The following relies on a variable 'temp_pointer' being declared with type
- * 'type'.  This is written this way just to hide the GCC strict aliasing
- * warning; note that the code is safe because there never is an alias between
- * the input and output pointers.
- */
-#define png_ldr(type,pointer)\
-   (temp_pointer = png_ptr(type,pointer), *temp_pointer)
-
-#if PNG_MIPS_MSA_OPT > 0
-
-#ifdef CLANG_BUILD
-   #define MSA_SRLI_B(a, b)   __msa_srli_b((v16i8) a, b)
-
-   #define LW(psrc)                              \
-   ( {                                           \
-       uint8_t *psrc_lw_m = (uint8_t *) (psrc);  \
-       uint32_t val_m;                           \
-                                                 \
-       asm volatile (                            \
-           "lw  %[val_m],  %[psrc_lw_m]  \n\t"   \
-                                                 \
-           : [val_m] "=r" (val_m)                \
-           : [psrc_lw_m] "m" (*psrc_lw_m)        \
-       );                                        \
-                                                 \
-       val_m;                                    \
-   } )
-
-   #define SH(val, pdst)                         \
-   {                                             \
-       uint8_t *pdst_sh_m = (uint8_t *) (pdst);  \
-       uint16_t val_m = (val);                   \
-                                                 \
-       asm volatile (                            \
-           "sh  %[val_m],  %[pdst_sh_m]  \n\t"   \
-                                                 \
-           : [pdst_sh_m] "=m" (*pdst_sh_m)       \
-           : [val_m] "r" (val_m)                 \
-       );                                        \
-   }
-
-   #define SW(val, pdst)                         \
-   {                                             \
-       uint8_t *pdst_sw_m = (uint8_t *) (pdst);  \
-       uint32_t val_m = (val);                   \
-                                                 \
-       asm volatile (                            \
-           "sw  %[val_m],  %[pdst_sw_m]  \n\t"   \
-                                                 \
-           : [pdst_sw_m] "=m" (*pdst_sw_m)       \
-           : [val_m] "r" (val_m)                 \
-       );                                        \
-   }
-
-       #if (__mips == 64)
-        #define SD(val, pdst)                         \
-        {                                             \
-            uint8_t *pdst_sd_m = (uint8_t *) (pdst);  \
-            uint64_t val_m = (val);                   \
-                                                      \
-            asm volatile (                            \
-                "sd  %[val_m],  %[pdst_sd_m]  \n\t"   \
-                                                      \
-                : [pdst_sd_m] "=m" (*pdst_sd_m)       \
-                : [val_m] "r" (val_m)                 \
-            );                                        \
-        }
-    #else
-        #define SD(val, pdst)                                          \
-        {                                                              \
-            uint8_t *pdst_sd_m = (uint8_t *) (pdst);                   \
-            uint32_t val0_m, val1_m;                                   \
-                                                                       \
-            val0_m = (uint32_t) ((val) & 0x00000000FFFFFFFF);          \
-            val1_m = (uint32_t) (((val) >> 32) & 0x00000000FFFFFFFF);  \
-                                                                       \
-            SW(val0_m, pdst_sd_m);                                     \
-            SW(val1_m, pdst_sd_m + 4);                                 \
-        }
-    #endif
-#else
-   #define MSA_SRLI_B(a, b)   (a >> b)
-
-#if (__mips_isa_rev >= 6)
-   #define LW(psrc)                              \
-   ( {                                           \
-       uint8_t *psrc_lw_m = (uint8_t *) (psrc);  \
-       uint32_t val_m;                           \
-                                                 \
-       asm volatile (                            \
-           "lw  %[val_m],  %[psrc_lw_m]  \n\t"   \
-                                                 \
-           : [val_m] "=r" (val_m)                \
-           : [psrc_lw_m] "m" (*psrc_lw_m)        \
-       );                                        \
-                                                 \
-       val_m;                                    \
-   } )
-
-   #define SH(val, pdst)                         \
-   {                                             \
-       uint8_t *pdst_sh_m = (uint8_t *) (pdst);  \
-       uint16_t val_m = (val);                   \
-                                                 \
-       asm volatile (                            \
-           "sh  %[val_m],  %[pdst_sh_m]  \n\t"   \
-                                                 \
-           : [pdst_sh_m] "=m" (*pdst_sh_m)       \
-           : [val_m] "r" (val_m)                 \
-       );                                        \
-   }
-
-   #define SW(val, pdst)                         \
-   {                                             \
-       uint8_t *pdst_sw_m = (uint8_t *) (pdst);  \
-       uint32_t val_m = (val);                   \
-                                                 \
-       asm volatile (                            \
-           "sw  %[val_m],  %[pdst_sw_m]  \n\t"   \
-                                                 \
-           : [pdst_sw_m] "=m" (*pdst_sw_m)       \
-           : [val_m] "r" (val_m)                 \
-       );                                        \
-   }
-
-   #if (__mips == 64)
-        #define SD(val, pdst)                         \
-        {                                             \
-            uint8_t *pdst_sd_m = (uint8_t *) (pdst);  \
-            uint64_t val_m = (val);                   \
-                                                      \
-            asm volatile (                            \
-                "sd  %[val_m],  %[pdst_sd_m]  \n\t"   \
-                                                      \
-                : [pdst_sd_m] "=m" (*pdst_sd_m)       \
-                : [val_m] "r" (val_m)                 \
-            );                                        \
-        }
-    #else
-        #define SD(val, pdst)                                          \
-        {                                                              \
-            uint8_t *pdst_sd_m = (uint8_t *) (pdst);                   \
-            uint32_t val0_m, val1_m;                                   \
-                                                                       \
-            val0_m = (uint32_t) ((val) & 0x00000000FFFFFFFF);          \
-            val1_m = (uint32_t) (((val) >> 32) & 0x00000000FFFFFFFF);  \
-                                                                       \
-            SW(val0_m, pdst_sd_m);                                     \
-            SW(val1_m, pdst_sd_m + 4);                                 \
-        }
-    #endif
-#else  // !(__mips_isa_rev >= 6)
-   #define LW(psrc)                              \
-   ( {                                           \
-       uint8_t *psrc_lw_m = (uint8_t *) (psrc);  \
-       uint32_t val_m;                           \
-                                                 \
-       asm volatile (                            \
-           "ulw  %[val_m],  %[psrc_lw_m]  \n\t"  \
-                                                 \
-           : [val_m] "=r" (val_m)                \
-           : [psrc_lw_m] "m" (*psrc_lw_m)        \
-       );                                        \
-                                                 \
-       val_m;                                    \
-   } )
-
-   #define SH(val, pdst)                         \
-   {                                             \
-       uint8_t *pdst_sh_m = (uint8_t *) (pdst);  \
-       uint16_t val_m = (val);                   \
-                                                 \
-       asm volatile (                            \
-           "ush  %[val_m],  %[pdst_sh_m]  \n\t"  \
-                                                 \
-           : [pdst_sh_m] "=m" (*pdst_sh_m)       \
-           : [val_m] "r" (val_m)                 \
-       );                                        \
-   }
-
-   #define SW(val, pdst)                         \
-   {                                             \
-       uint8_t *pdst_sw_m = (uint8_t *) (pdst);  \
-       uint32_t val_m = (val);                   \
-                                                 \
-       asm volatile (                            \
-           "usw  %[val_m],  %[pdst_sw_m]  \n\t"  \
-                                                 \
-           : [pdst_sw_m] "=m" (*pdst_sw_m)       \
-           : [val_m] "r" (val_m)                 \
-       );                                        \
-   }
-
-   #define SD(val, pdst)                                          \
-    {                                                              \
-        uint8_t *pdst_sd_m = (uint8_t *) (pdst);                   \
-        uint32_t val0_m, val1_m;                                   \
-                                                                   \
-        val0_m = (uint32_t) ((val) & 0x00000000FFFFFFFF);          \
-        val1_m = (uint32_t) (((val) >> 32) & 0x00000000FFFFFFFF);  \
-                                                                   \
-        SW(val0_m, pdst_sd_m);                                     \
-        SW(val1_m, pdst_sd_m + 4);                                 \
-    }
-
-    #define SW_ZERO(pdst)                      \
-    {                                          \
-        uint8_t *pdst_m = (uint8_t *) (pdst);  \
-                                               \
-        asm volatile (                         \
-            "usw  $0,  %[pdst_m]  \n\t"        \
-                                               \
-            : [pdst_m] "=m" (*pdst_m)          \
-            :                                  \
-        );                                     \
-    }
-#endif  // (__mips_isa_rev >= 6)
-#endif
-
-#define LD_B(RTYPE, psrc) *((RTYPE *) (psrc))
-#define LD_UB(...) LD_B(v16u8, __VA_ARGS__)
-#define LD_B2(RTYPE, psrc, stride, out0, out1)  \
-{                                               \
-    out0 = LD_B(RTYPE, (psrc));                 \
-    out1 = LD_B(RTYPE, (psrc) + stride);        \
-}
-#define LD_UB2(...) LD_B2(v16u8, __VA_ARGS__)
-#define LD_B4(RTYPE, psrc, stride, out0, out1, out2, out3)   \
-{                                                            \
-    LD_B2(RTYPE, (psrc), stride, out0, out1);                \
-    LD_B2(RTYPE, (psrc) + 2 * stride , stride, out2, out3);  \
-}
-#define LD_UB4(...) LD_B4(v16u8, __VA_ARGS__)
-
-#define ST_B(RTYPE, in, pdst) *((RTYPE *) (pdst)) = (in)
-#define ST_UB(...) ST_B(v16u8, __VA_ARGS__)
-#define ST_B2(RTYPE, in0, in1, pdst, stride)  \
-{                                             \
-    ST_B(RTYPE, in0, (pdst));                 \
-    ST_B(RTYPE, in1, (pdst) + stride);        \
-}
-#define ST_UB2(...) ST_B2(v16u8, __VA_ARGS__)
-#define ST_B4(RTYPE, in0, in1, in2, in3, pdst, stride)    \
-{                                                         \
-    ST_B2(RTYPE, in0, in1, (pdst), stride);               \
-    ST_B2(RTYPE, in2, in3, (pdst) + 2 * stride, stride);  \
-}
-#define ST_UB4(...) ST_B4(v16u8, __VA_ARGS__)
-
-#define ADD2(in0, in1, in2, in3, out0, out1)  \
-{                                             \
-    out0 = in0 + in1;                         \
-    out1 = in2 + in3;                         \
-}
-#define ADD3(in0, in1, in2, in3, in4, in5,  \
-             out0, out1, out2)              \
-{                                           \
-    ADD2(in0, in1, in2, in3, out0, out1);   \
-    out2 = in4 + in5;                       \
-}
-#define ADD4(in0, in1, in2, in3, in4, in5, in6, in7,  \
-             out0, out1, out2, out3)                  \
-{                                                     \
-    ADD2(in0, in1, in2, in3, out0, out1);             \
-    ADD2(in4, in5, in6, in7, out2, out3);             \
-}
-
-#define ILVR_B2(RTYPE, in0, in1, in2, in3, out0, out1)      \
-{                                                           \
-    out0 = (RTYPE) __msa_ilvr_b((v16i8) in0, (v16i8) in1);  \
-    out1 = (RTYPE) __msa_ilvr_b((v16i8) in2, (v16i8) in3);  \
-}
-#define ILVR_B2_SH(...) ILVR_B2(v8i16, __VA_ARGS__)
-
-#define HSUB_UB2(RTYPE, in0, in1, out0, out1)                 \
-{                                                             \
-    out0 = (RTYPE) __msa_hsub_u_h((v16u8) in0, (v16u8) in0);  \
-    out1 = (RTYPE) __msa_hsub_u_h((v16u8) in1, (v16u8) in1);  \
-}
-#define HSUB_UB2_SH(...) HSUB_UB2(v8i16, __VA_ARGS__)
-
-#define SLDI_B2_0(RTYPE, in0, in1, out0, out1, slide_val)                 \
-{                                                                         \
-    v16i8 zero_m = { 0 };                                                 \
-    out0 = (RTYPE) __msa_sldi_b((v16i8) zero_m, (v16i8) in0, slide_val);  \
-    out1 = (RTYPE) __msa_sldi_b((v16i8) zero_m, (v16i8) in1, slide_val);  \
-}
-#define SLDI_B2_0_UB(...) SLDI_B2_0(v16u8, __VA_ARGS__)
-
-#define SLDI_B3_0(RTYPE, in0, in1, in2, out0, out1, out2,  slide_val)     \
-{                                                                         \
-    v16i8 zero_m = { 0 };                                                 \
-    SLDI_B2_0(RTYPE, in0, in1, out0, out1, slide_val);                    \
-    out2 = (RTYPE) __msa_sldi_b((v16i8) zero_m, (v16i8) in2, slide_val);  \
-}
-#define SLDI_B3_0_UB(...) SLDI_B3_0(v16u8, __VA_ARGS__)
-
-#define ILVEV_W2(RTYPE, in0, in1, in2, in3, out0, out1)      \
-{                                                            \
-    out0 = (RTYPE) __msa_ilvev_w((v4i32) in1, (v4i32) in0);  \
-    out1 = (RTYPE) __msa_ilvev_w((v4i32) in3, (v4i32) in2);  \
-}
-#define ILVEV_W2_UB(...) ILVEV_W2(v16u8, __VA_ARGS__)
-
-#define ADD_ABS_H3(RTYPE, in0, in1, in2, out0, out1, out2)  \
-{                                                           \
-    RTYPE zero = {0};                                       \
-                                                            \
-    out0 = __msa_add_a_h((v8i16) zero, in0);                \
-    out1 = __msa_add_a_h((v8i16) zero, in1);                \
-    out2 = __msa_add_a_h((v8i16) zero, in2);                \
-}
-#define ADD_ABS_H3_SH(...) ADD_ABS_H3(v8i16, __VA_ARGS__)
-
-#define VSHF_B2(RTYPE, in0, in1, in2, in3, mask0, mask1, out0, out1)       \
-{                                                                          \
-    out0 = (RTYPE) __msa_vshf_b((v16i8) mask0, (v16i8) in1, (v16i8) in0);  \
-    out1 = (RTYPE) __msa_vshf_b((v16i8) mask1, (v16i8) in3, (v16i8) in2);  \
-}
-#define VSHF_B2_UB(...) VSHF_B2(v16u8, __VA_ARGS__)
-
-#define CMP_AND_SELECT(inp0, inp1, inp2, inp3, inp4, inp5, out0)              \
-{                                                                             \
-   v8i16 _sel_h0, _sel_h1;                                                    \
-   v16u8 _sel_b0, _sel_b1;                                                    \
-   _sel_h0 = (v8i16) __msa_clt_u_h((v8u16) inp1, (v8u16) inp0);               \
-   _sel_b0 = (v16u8) __msa_pckev_b((v16i8) _sel_h0, (v16i8) _sel_h0);         \
-   inp0 = (v8i16) __msa_bmnz_v((v16u8) inp0, (v16u8) inp1, (v16u8) _sel_h0);  \
-   inp4 = (v16u8) __msa_bmnz_v(inp3, inp4, _sel_b0);                          \
-   _sel_h1 = (v8i16) __msa_clt_u_h((v8u16) inp2, (v8u16) inp0);               \
-   _sel_b1 = (v16u8) __msa_pckev_b((v16i8) _sel_h1, (v16i8) _sel_h1);         \
-   inp4 = (v16u8) __msa_bmnz_v(inp4, inp5, _sel_b1);                          \
-   out0 += inp4;                                                              \
-}
-
-void png_read_filter_row_up_msa(png_row_infop row_info, png_bytep row,
-                                png_const_bytep prev_row)
-{
-   png_size_t i, cnt, cnt16, cnt32;
-   png_size_t istop = row_info->rowbytes;
-   png_bytep rp = row;
-   png_const_bytep pp = prev_row;
-   v16u8 src0, src1, src2, src3, src4, src5, src6, src7;
-
-   for (i = 0; i < (istop >> 6); i++)
-   {
-      LD_UB4(rp, 16, src0, src1, src2, src3);
-      LD_UB4(pp, 16, src4, src5, src6, src7);
-      pp += 64;
-
-	  ADD4(src0, src4, src1, src5, src2, src6, src3, src7,
-	       src0, src1, src2, src3);
-
-      ST_UB4(src0, src1, src2, src3, rp, 16);
-      rp += 64;
-   }
-
-   if (istop & 0x3F)
-   {
-      cnt32 = istop & 0x20;
-      cnt16 = istop & 0x10;
-      cnt = istop & 0xF;
-
-      if(cnt32)
-      {
-         if (cnt16 && cnt)
-         {
-            LD_UB4(rp, 16, src0, src1, src2, src3);
-            LD_UB4(pp, 16, src4, src5, src6, src7);
-
-            ADD4(src0, src4, src1, src5, src2, src6, src3, src7,
-	             src0, src1, src2, src3);
-
-            ST_UB4(src0, src1, src2, src3, rp, 16);
-            rp += 64;
-         }
-         else if (cnt16 || cnt)
-         {
-            LD_UB2(rp, 16, src0, src1);
-            LD_UB2(pp, 16, src4, src5);
-            pp += 32;
-            src2 = LD_UB(rp + 32);
-            src6 = LD_UB(pp);
-
-            ADD3(src0, src4, src1, src5, src2, src6, src0, src1, src2);
-
-            ST_UB2(src0, src1, rp, 16);
-            rp += 32;
-            ST_UB(src2, rp);
-            rp += 16;
-         }
-         else
-         {
-            LD_UB2(rp, 16, src0, src1);
-            LD_UB2(pp, 16, src4, src5);
-
-			ADD2(src0, src4, src1, src5, src0, src1);
-
-            ST_UB2(src0, src1, rp, 16);
-            rp += 32;
-         }
-      }
-      else if (cnt16 && cnt)
-      {
-         LD_UB2(rp, 16, src0, src1);
-         LD_UB2(pp, 16, src4, src5);
-
-         ADD2(src0, src4, src1, src5, src0, src1);
-
-         ST_UB2(src0, src1, rp, 16);
-         rp += 32;
-      }
-      else if (cnt16 || cnt)
-      {
-         src0 = LD_UB(rp);
-         src4 = LD_UB(pp);
-         pp += 16;
-
-         src0 += src4;
-
-         ST_UB(src0, rp);
-         rp += 16;
-      }
-   }
-}
-
-void png_read_filter_row_sub4_msa(png_row_infop row_info, png_bytep row,
-                                  png_const_bytep prev_row)
-{
-   png_size_t count;
-   png_size_t istop = row_info->rowbytes;
-   png_bytep src = row;
-   png_bytep nxt = row + 4;
-   int32_t inp0;
-   v16u8 src0, src1, src2, src3, src4;
-   v16u8 dst0, dst1;
-   v16u8 zero = { 0 };
-
-   istop -= 4;
-
-   inp0 = LW(src);
-   src += 4;
-   src0 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp0);
-
-   for (count = 0; count < istop; count += 16)
-   {
-      src1 = LD_UB(src);
-      src += 16;
-
-      src2 = (v16u8) __msa_sldi_b((v16i8) zero, (v16i8) src1, 4);
-      src3 = (v16u8) __msa_sldi_b((v16i8) zero, (v16i8) src1, 8);
-      src4 = (v16u8) __msa_sldi_b((v16i8) zero, (v16i8) src1, 12);
-      src1 += src0;
-      src2 += src1;
-      src3 += src2;
-      src4 += src3;
-      src0 = src4;
-      ILVEV_W2_UB(src1, src2, src3, src4, dst0, dst1);
-      dst0 = (v16u8) __msa_pckev_d((v2i64) dst1, (v2i64) dst0);
-
-      ST_UB(dst0, nxt);
-      nxt += 16;
-   }
-}
-
-void png_read_filter_row_sub3_msa(png_row_infop row_info, png_bytep row,
-                                  png_const_bytep prev_row)
-{
-   png_size_t count;
-   png_size_t istop = row_info->rowbytes;
-   png_bytep src = row;
-   png_bytep nxt = row + 3;
-   int64_t out0;
-   int32_t inp0, out1;
-   v16u8 src0, src1, src2, src3, src4, dst0, dst1;
-   v16u8 zero = { 0 };
-   v16i8 mask0 = { 0, 1, 2, 16, 17, 18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
-   v16i8 mask1 = { 0, 1, 2, 3, 4, 5, 16, 17, 18, 19, 20, 21, 0, 0, 0, 0 };
-
-   istop -= 3;
-
-   inp0 = LW(src);
-   src += 3;
-   src0 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp0);
-
-   for (count = 0; count < istop; count += 12)
-   {
-      src1 = LD_UB(src);
-      src += 12;
-
-      src2 = (v16u8) __msa_sldi_b((v16i8) zero, (v16i8) src1, 3);
-      src3 = (v16u8) __msa_sldi_b((v16i8) zero, (v16i8) src1, 6);
-      src4 = (v16u8) __msa_sldi_b((v16i8) zero, (v16i8) src1, 9);
-      src1 += src0;
-      src2 += src1;
-      src3 += src2;
-      src4 += src3;
-      src0 = src4;
-      VSHF_B2_UB(src1, src2, src3, src4, mask0, mask0, dst0, dst1);
-      dst0 = (v16u8) __msa_vshf_b(mask1, (v16i8) dst1, (v16i8) dst0);
-      out0 = __msa_copy_s_d((v2i64) dst0, 0);
-      out1 = __msa_copy_s_w((v4i32) dst0, 2);
-
-      SD(out0, nxt);
-      nxt += 8;
-      SW(out1, nxt);
-      nxt += 4;
-   }
-}
-
-void png_read_filter_row_avg4_msa(png_row_infop row_info, png_bytep row,
-                                  png_const_bytep prev_row)
-{
-   png_size_t i;
-   png_bytep src = row;
-   png_bytep nxt = row;
-   png_const_bytep pp = prev_row;
-   png_size_t istop = row_info->rowbytes - 4;
-   int32_t inp0, inp1, out0;
-   v16u8 src0, src1, src2, src3, src4, src5, src6, src7, src8, src9, dst0, dst1;
-   v16u8 zero = { 0 };
-
-   inp0 = LW(pp);
-   pp += 4;
-   inp1 = LW(src);
-   src += 4;
-   src0 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp0);
-   src1 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp1);
-   src0 = (v16u8) MSA_SRLI_B(src0, 1);
-   src1 += src0;
-   out0 = __msa_copy_s_w((v4i32) src1, 0);
-   SW(out0, nxt);
-   nxt += 4;
-
-   for (i = 0; i < istop; i += 16)
-   {
-      src2 = LD_UB(pp);
-      pp += 16;
-      src6 = LD_UB(src);
-      src += 16;
-
-      SLDI_B2_0_UB(src2, src6, src3, src7, 4);
-      SLDI_B2_0_UB(src2, src6, src4, src8, 8);
-      SLDI_B2_0_UB(src2, src6, src5, src9, 12);
-      src2 = __msa_ave_u_b(src2, src1);
-      src6 += src2;
-      src3 = __msa_ave_u_b(src3, src6);
-      src7 += src3;
-      src4 = __msa_ave_u_b(src4, src7);
-      src8 += src4;
-      src5 = __msa_ave_u_b(src5, src8);
-      src9 += src5;
-      src1 = src9;
-      ILVEV_W2_UB(src6, src7, src8, src9, dst0, dst1);
-      dst0 = (v16u8) __msa_pckev_d((v2i64) dst1, (v2i64) dst0);
-
-      ST_UB(dst0, nxt);
-      nxt += 16;
-   }
-}
-
-void png_read_filter_row_avg3_msa(png_row_infop row_info, png_bytep row,
-                                  png_const_bytep prev_row)
-{
-   png_size_t i;
-   png_bytep src = row;
-   png_bytep nxt = row;
-   png_const_bytep pp = prev_row;
-   png_size_t istop = row_info->rowbytes - 3;
-   int64_t out0;
-   int32_t inp0, inp1, out1;
-   int16_t out2;
-   v16u8 src0, src1, src2, src3, src4, src5, src6, src7, src8, src9, dst0, dst1;
-   v16u8 zero = { 0 };
-   v16i8 mask0 = { 0, 1, 2, 16, 17, 18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
-   v16i8 mask1 = { 0, 1, 2, 3, 4, 5, 16, 17, 18, 19, 20, 21, 0, 0, 0, 0 };
-
-   inp0 = LW(pp);
-   pp += 3;
-   inp1 = LW(src);
-   src += 3;
-   src0 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp0);
-   src1 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp1);
-   src0 = (v16u8) MSA_SRLI_B(src0, 1);
-   src1 += src0;
-   out2 = __msa_copy_s_h((v8i16) src1, 0);
-   SH(out2, nxt);
-   nxt += 2;
-   nxt[0] = src1[2];
-   nxt++;
-
-   for (i = 0; i < istop; i += 12)
-   {
-      src2 = LD_UB(pp);
-      pp += 12;
-      src6 = LD_UB(src);
-      src += 12;
-
-      SLDI_B2_0_UB(src2, src6, src3, src7, 3);
-      SLDI_B2_0_UB(src2, src6, src4, src8, 6);
-      SLDI_B2_0_UB(src2, src6, src5, src9, 9);
-      src2 = __msa_ave_u_b(src2, src1);
-      src6 += src2;
-      src3 = __msa_ave_u_b(src3, src6);
-      src7 += src3;
-      src4 = __msa_ave_u_b(src4, src7);
-      src8 += src4;
-      src5 = __msa_ave_u_b(src5, src8);
-      src9 += src5;
-      src1 = src9;
-      VSHF_B2_UB(src6, src7, src8, src9, mask0, mask0, dst0, dst1);
-      dst0 = (v16u8) __msa_vshf_b(mask1, (v16i8) dst1, (v16i8) dst0);
-      out0 = __msa_copy_s_d((v2i64) dst0, 0);
-      out1 = __msa_copy_s_w((v4i32) dst0, 2);
-
-      SD(out0, nxt);
-      nxt += 8;
-      SW(out1, nxt);
-      nxt += 4;
-   }
-}
-
-void png_read_filter_row_paeth4_msa(png_row_infop row_info,
-                                    png_bytep row,
-                                    png_const_bytep prev_row)
-{
-   int32_t count, rp_end;
-   png_bytep nxt;
-   png_const_bytep prev_nxt;
-   int32_t inp0, inp1, res0;
-   v16u8 src0, src1, src2, src3, src4, src5, src6, src7, src8, src9;
-   v16u8 src10, src11, src12, src13, dst0, dst1;
-   v8i16 vec0, vec1, vec2;
-   v16u8 zero = { 0 };
-
-   nxt = row;
-   prev_nxt = prev_row;
-
-   inp0 = LW(nxt);
-   inp1 = LW(prev_nxt);
-   prev_nxt += 4;
-   src0 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp0);
-   src1 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp1);
-
-   src1 += src0;
-   res0 = __msa_copy_s_w((v4i32) src1, 0);
-
-   SW(res0, nxt);
-   nxt += 4;
-
-   /* Remainder */
-   rp_end = row_info->rowbytes - 4;
-
-   for (count = 0; count < rp_end; count += 16)
-   {
-      src2 = LD_UB(prev_nxt);
-      prev_nxt += 16;
-      src6 = LD_UB(prev_row);
-      prev_row += 16;
-      src10 = LD_UB(nxt);
-
-      SLDI_B3_0_UB(src2, src6, src10, src3, src7, src11, 4);
-      SLDI_B3_0_UB(src2, src6, src10, src4, src8, src12, 8);
-      SLDI_B3_0_UB(src2, src6, src10, src5, src9, src13, 12);
-      ILVR_B2_SH(src2, src6, src1, src6, vec0, vec1);
-      HSUB_UB2_SH(vec0, vec1, vec0, vec1);
-      vec2 = vec0 + vec1;
-      ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
-      CMP_AND_SELECT(vec0, vec1, vec2, src1, src2, src6, src10);
-      ILVR_B2_SH(src3, src7, src10, src7, vec0, vec1);
-      HSUB_UB2_SH(vec0, vec1, vec0, vec1);
-      vec2 = vec0 + vec1;
-      ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
-      CMP_AND_SELECT(vec0, vec1, vec2, src10, src3, src7, src11);
-      ILVR_B2_SH(src4, src8, src11, src8, vec0, vec1);
-      HSUB_UB2_SH(vec0, vec1, vec0, vec1);
-      vec2 = vec0 + vec1;
-      ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
-      CMP_AND_SELECT(vec0, vec1, vec2, src11, src4, src8, src12);
-      ILVR_B2_SH(src5, src9, src12, src9, vec0, vec1);
-      HSUB_UB2_SH(vec0, vec1, vec0, vec1);
-      vec2 = vec0 + vec1;
-      ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
-      CMP_AND_SELECT(vec0, vec1, vec2, src12, src5, src9, src13);
-      src1 = src13;
-      ILVEV_W2_UB(src10, src11, src12, src1, dst0, dst1);
-      dst0 = (v16u8) __msa_pckev_d((v2i64) dst1, (v2i64) dst0);
-
-      ST_UB(dst0, nxt);
-      nxt += 16;
-   }
-}
-
-void png_read_filter_row_paeth3_msa(png_row_infop row_info,
-                                    png_bytep row,
-                                    png_const_bytep prev_row)
-{
-   int32_t count, rp_end;
-   png_bytep nxt;
-   png_const_bytep prev_nxt;
-   int64_t out0;
-   int32_t inp0, inp1, out1;
-   int16_t out2;
-   v16u8 src0, src1, src2, src3, src4, src5, src6, src7, src8, src9, dst0, dst1;
-   v16u8 src10, src11, src12, src13;
-   v8i16 vec0, vec1, vec2;
-   v16u8 zero = { 0 };
-   v16i8 mask0 = { 0, 1, 2, 16, 17, 18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
-   v16i8 mask1 = { 0, 1, 2, 3, 4, 5, 16, 17, 18, 19, 20, 21, 0, 0, 0, 0 };
-
-   nxt = row;
-   prev_nxt = prev_row;
-
-   inp0 = LW(nxt);
-   inp1 = LW(prev_nxt);
-   prev_nxt += 3;
-   src0 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp0);
-   src1 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp1);
-
-   src1 += src0;
-   out2 = __msa_copy_s_h((v8i16) src1, 0);
-
-   SH(out2, nxt);
-   nxt += 2;
-   nxt[0] = src1[2];
-   nxt++;
-
-   /* Remainder */
-   rp_end = row_info->rowbytes - 3;
-
-   for (count = 0; count < rp_end; count += 12)
-   {
-      src2 = LD_UB(prev_nxt);
-      prev_nxt += 12;
-      src6 = LD_UB(prev_row);
-      prev_row += 12;
-      src10 = LD_UB(nxt);
-
-      SLDI_B3_0_UB(src2, src6, src10, src3, src7, src11, 3);
-      SLDI_B3_0_UB(src2, src6, src10, src4, src8, src12, 6);
-      SLDI_B3_0_UB(src2, src6, src10, src5, src9, src13, 9);
-      ILVR_B2_SH(src2, src6, src1, src6, vec0, vec1);
-      HSUB_UB2_SH(vec0, vec1, vec0, vec1);
-      vec2 = vec0 + vec1;
-      ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
-      CMP_AND_SELECT(vec0, vec1, vec2, src1, src2, src6, src10);
-      ILVR_B2_SH(src3, src7, src10, src7, vec0, vec1);
-      HSUB_UB2_SH(vec0, vec1, vec0, vec1);
-      vec2 = vec0 + vec1;
-      ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
-      CMP_AND_SELECT(vec0, vec1, vec2, src10, src3, src7, src11);
-      ILVR_B2_SH(src4, src8, src11, src8, vec0, vec1);
-      HSUB_UB2_SH(vec0, vec1, vec0, vec1);
-      vec2 = vec0 + vec1;
-      ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
-      CMP_AND_SELECT(vec0, vec1, vec2, src11, src4, src8, src12);
-      ILVR_B2_SH(src5, src9, src12, src9, vec0, vec1);
-      HSUB_UB2_SH(vec0, vec1, vec0, vec1);
-      vec2 = vec0 + vec1;
-      ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
-      CMP_AND_SELECT(vec0, vec1, vec2, src12, src5, src9, src13);
-      src1 = src13;
-      VSHF_B2_UB(src10, src11, src12, src13, mask0, mask0, dst0, dst1);
-      dst0 = (v16u8) __msa_vshf_b(mask1, (v16i8) dst1, (v16i8) dst0);
-      out0 = __msa_copy_s_d((v2i64) dst0, 0);
-      out1 = __msa_copy_s_w((v4i32) dst0, 2);
-
-      SD(out0, nxt);
-      nxt += 8;
-      SW(out1, nxt);
-      nxt += 4;
-   }
-}
-
-#endif /* PNG_MIPS_MSA_OPT > 0 */
-#endif /* PNG_MIPS_MSA_IMPLEMENTATION == 1 (intrinsics) */
-#endif /* READ */
diff --git a/src/png/libpng/mips/mips_init.c b/src/png/libpng/mips/mips_init.c
deleted file mode 100644
index 0bfb7a32e..000000000
--- a/src/png/libpng/mips/mips_init.c
+++ /dev/null
@@ -1,129 +0,0 @@
-
-/* mips_init.c - MSA optimised filter functions
- *
- * Copyright (c) 2016 Glenn Randers-Pehrson
- * Written by Mandar Sahastrabuddhe, 2016.
- * Last changed in libpng 1.6.25 [September 1, 2016]
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-/* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are
- * called.
- */
-#define _POSIX_SOURCE 1
-
-#include <stdio.h>
-#include "../pngpriv.h"
-
-#ifdef PNG_READ_SUPPORTED
-
-#if PNG_MIPS_MSA_OPT > 0
-#ifdef PNG_MIPS_MSA_CHECK_SUPPORTED /* Do run-time checks */
-/* WARNING: it is strongly recommended that you do not build libpng with
- * run-time checks for CPU features if at all possible.  In the case of the MIPS
- * MSA instructions there is no processor-specific way of detecting the
- * presence of the required support, therefore run-time detection is extremely
- * OS specific.
- *
- * You may set the macro PNG_MIPS_MSA_FILE to the file name of file containing
- * a fragment of C source code which defines the png_have_msa function.  There
- * are a number of implementations in contrib/mips-msa, but the only one that
- * has partial support is contrib/mips-msa/linux.c - a generic Linux
- * implementation which reads /proc/cpufino.
- */
-#ifndef PNG_MIPS_MSA_FILE
-#  ifdef __linux__
-#     define PNG_MIPS_MSA_FILE "contrib/mips-msa/linux.c"
-#  endif
-#endif
-
-#ifdef PNG_MIPS_MSA_FILE
-
-#include <signal.h> /* for sig_atomic_t */
-static int png_have_msa(png_structp png_ptr);
-#include PNG_MIPS_MSA_FILE
-
-#else  /* PNG_MIPS_MSA_FILE */
-#  error "PNG_MIPS_MSA_FILE undefined: no support for run-time MIPS MSA checks"
-#endif /* PNG_MIPS_MSA_FILE */
-#endif /* PNG_MIPS_MSA_CHECK_SUPPORTED */
-
-#ifndef PNG_ALIGNED_MEMORY_SUPPORTED
-#  error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED"
-#endif
-
-void
-png_init_filter_functions_msa(png_structp pp, unsigned int bpp)
-{
-   /* The switch statement is compiled in for MIPS_MSA_API, the call to
-    * png_have_msa is compiled in for MIPS_MSA_CHECK. If both are defined
-    * the check is only performed if the API has not set the MSA option on
-    * or off explicitly. In this case the check controls what happens.
-    */
-
-#ifdef PNG_MIPS_MSA_API_SUPPORTED
-   switch ((pp->options >> PNG_MIPS_MSA) & 3)
-   {
-      case PNG_OPTION_UNSET:
-         /* Allow the run-time check to execute if it has been enabled -
-          * thus both API and CHECK can be turned on.  If it isn't supported
-          * this case will fall through to the 'default' below, which just
-          * returns.
-          */
-#endif /* PNG_MIPS_MSA_API_SUPPORTED */
-#ifdef PNG_MIPS_MSA_CHECK_SUPPORTED
-         {
-            static volatile sig_atomic_t no_msa = -1; /* not checked */
-
-            if (no_msa < 0)
-               no_msa = !png_have_msa(pp);
-
-            if (no_msa)
-               return;
-         }
-#ifdef PNG_MIPS_MSA_API_SUPPORTED
-         break;
-#endif
-#endif /* PNG_MIPS_MSA_CHECK_SUPPORTED */
-
-#ifdef PNG_MIPS_MSA_API_SUPPORTED
-      default: /* OFF or INVALID */
-         return;
-
-      case PNG_OPTION_ON:
-         /* Option turned on */
-         break;
-   }
-#endif
-
-   /* IMPORTANT: any new external functions used here must be declared using
-    * PNG_INTERNAL_FUNCTION in ../pngpriv.h.  This is required so that the
-    * 'prefix' option to configure works:
-    *
-    *    ./configure --with-libpng-prefix=foobar_
-    *
-    * Verify you have got this right by running the above command, doing a build
-    * and examining pngprefix.h; it must contain a #define for every external
-    * function you add.  (Notice that this happens automatically for the
-    * initialization function.)
-    */
-   pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_msa;
-
-   if (bpp == 3)
-   {
-      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_msa;
-      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_msa;
-      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_msa;
-   }
-
-   else if (bpp == 4)
-   {
-      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_msa;
-      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_msa;
-      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_msa;
-   }
-}
-#endif /* PNG_MIPS_MSA_OPT > 0 */
-#endif /* READ */
diff --git a/src/png/libpng/png.c b/src/png/libpng/png.c
deleted file mode 100644
index ff02c5651..000000000
--- a/src/png/libpng/png.c
+++ /dev/null
@@ -1,4614 +0,0 @@
-
-/* png.c - location for general purpose libpng functions
- *
- * Last changed in libpng 1.6.33 [September 28, 2017]
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#include "pngpriv.h"
-
-/* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_34 Your_png_h_is_not_version_1_6_34;
-
-#ifdef __GNUC__
-/* The version tests may need to be added to, but the problem warning has
- * consistently been fixed in GCC versions which obtain wide-spread release.
- * The problem is that many versions of GCC rearrange comparison expressions in
- * the optimizer in such a way that the results of the comparison will change
- * if signed integer overflow occurs.  Such comparisons are not permitted in
- * ANSI C90, however GCC isn't clever enough to work out that that do not occur
- * below in png_ascii_from_fp and png_muldiv, so it produces a warning with
- * -Wextra.  Unfortunately this is highly dependent on the optimizer and the
- * machine architecture so the warning comes and goes unpredictably and is
- * impossible to "fix", even were that a good idea.
- */
-#if __GNUC__ == 7 && __GNUC_MINOR__ == 1
-#define GCC_STRICT_OVERFLOW 1
-#endif /* GNU 7.1.x */
-#endif /* GNU */
-#ifndef GCC_STRICT_OVERFLOW
-#define GCC_STRICT_OVERFLOW 0
-#endif
-
-/* Tells libpng that we have already handled the first "num_bytes" bytes
- * of the PNG file signature.  If the PNG data is embedded into another
- * stream we can set num_bytes = 8 so that libpng will not attempt to read
- * or write any of the magic bytes before it starts on the IHDR.
- */
-
-#ifdef PNG_READ_SUPPORTED
-void PNGAPI
-png_set_sig_bytes(png_structrp png_ptr, int num_bytes)
-{
-   unsigned int nb = (unsigned int)num_bytes;
-
-   png_debug(1, "in png_set_sig_bytes");
-
-   if (png_ptr == NULL)
-      return;
-
-   if (num_bytes < 0)
-      nb = 0;
-
-   if (nb > 8)
-      png_error(png_ptr, "Too many bytes for PNG signature");
-
-   png_ptr->sig_bytes = (png_byte)nb;
-}
-
-/* Checks whether the supplied bytes match the PNG signature.  We allow
- * checking less than the full 8-byte signature so that those apps that
- * already read the first few bytes of a file to determine the file type
- * can simply check the remaining bytes for extra assurance.  Returns
- * an integer less than, equal to, or greater than zero if sig is found,
- * respectively, to be less than, to match, or be greater than the correct
- * PNG signature (this is the same behavior as strcmp, memcmp, etc).
- */
-int PNGAPI
-png_sig_cmp(png_const_bytep sig, png_size_t start, png_size_t num_to_check)
-{
-   png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
-
-   if (num_to_check > 8)
-      num_to_check = 8;
-
-   else if (num_to_check < 1)
-      return (-1);
-
-   if (start > 7)
-      return (-1);
-
-   if (start + num_to_check > 8)
-      num_to_check = 8 - start;
-
-   return ((int)(memcmp(&sig[start], &png_signature[start], num_to_check)));
-}
-
-#endif /* READ */
-
-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-/* Function to allocate memory for zlib */
-PNG_FUNCTION(voidpf /* PRIVATE */,
-png_zalloc,(voidpf png_ptr, uInt items, uInt size),PNG_ALLOCATED)
-{
-   png_alloc_size_t num_bytes = size;
-
-   if (png_ptr == NULL)
-      return NULL;
-
-   if (items >= (~(png_alloc_size_t)0)/size)
-   {
-      png_warning (png_voidcast(png_structrp, png_ptr),
-          "Potential overflow in png_zalloc()");
-      return NULL;
-   }
-
-   num_bytes *= items;
-   return png_malloc_warn(png_voidcast(png_structrp, png_ptr), num_bytes);
-}
-
-/* Function to free memory for zlib */
-void /* PRIVATE */
-png_zfree(voidpf png_ptr, voidpf ptr)
-{
-   png_free(png_voidcast(png_const_structrp,png_ptr), ptr);
-}
-
-/* Reset the CRC variable to 32 bits of 1's.  Care must be taken
- * in case CRC is > 32 bits to leave the top bits 0.
- */
-void /* PRIVATE */
-png_reset_crc(png_structrp png_ptr)
-{
-   /* The cast is safe because the crc is a 32-bit value. */
-   png_ptr->crc = (png_uint_32)crc32(0, Z_NULL, 0);
-}
-
-/* Calculate the CRC over a section of data.  We can only pass as
- * much data to this routine as the largest single buffer size.  We
- * also check that this data will actually be used before going to the
- * trouble of calculating it.
- */
-void /* PRIVATE */
-png_calculate_crc(png_structrp png_ptr, png_const_bytep ptr, png_size_t length)
-{
-   int need_crc = 1;
-
-   if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name) != 0)
-   {
-      if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
-          (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
-         need_crc = 0;
-   }
-
-   else /* critical */
-   {
-      if ((png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) != 0)
-         need_crc = 0;
-   }
-
-   /* 'uLong' is defined in zlib.h as unsigned long; this means that on some
-    * systems it is a 64-bit value.  crc32, however, returns 32 bits so the
-    * following cast is safe.  'uInt' may be no more than 16 bits, so it is
-    * necessary to perform a loop here.
-    */
-   if (need_crc != 0 && length > 0)
-   {
-      uLong crc = png_ptr->crc; /* Should never issue a warning */
-
-      do
-      {
-         uInt safe_length = (uInt)length;
-#ifndef __COVERITY__
-         if (safe_length == 0)
-            safe_length = (uInt)-1; /* evil, but safe */
-#endif
-
-         crc = crc32(crc, ptr, safe_length);
-
-         /* The following should never issue compiler warnings; if they do the
-          * target system has characteristics that will probably violate other
-          * assumptions within the libpng code.
-          */
-         ptr += safe_length;
-         length -= safe_length;
-      }
-      while (length > 0);
-
-      /* And the following is always safe because the crc is only 32 bits. */
-      png_ptr->crc = (png_uint_32)crc;
-   }
-}
-
-/* Check a user supplied version number, called from both read and write
- * functions that create a png_struct.
- */
-int
-png_user_version_check(png_structrp png_ptr, png_const_charp user_png_ver)
-{
-   /* Libpng versions 1.0.0 and later are binary compatible if the version
-    * string matches through the second '.'; we must recompile any
-    * applications that use any older library version.
-    */
-
-   if (user_png_ver != NULL)
-   {
-      int i = -1;
-      int found_dots = 0;
-
-      do
-      {
-         i++;
-         if (user_png_ver[i] != PNG_LIBPNG_VER_STRING[i])
-            png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
-         if (user_png_ver[i] == '.')
-            found_dots++;
-      } while (found_dots < 2 && user_png_ver[i] != 0 &&
-            PNG_LIBPNG_VER_STRING[i] != 0);
-   }
-
-   else
-      png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
-
-   if ((png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) != 0)
-   {
-#ifdef PNG_WARNINGS_SUPPORTED
-      size_t pos = 0;
-      char m[128];
-
-      pos = png_safecat(m, (sizeof m), pos,
-          "Application built with libpng-");
-      pos = png_safecat(m, (sizeof m), pos, user_png_ver);
-      pos = png_safecat(m, (sizeof m), pos, " but running with ");
-      pos = png_safecat(m, (sizeof m), pos, PNG_LIBPNG_VER_STRING);
-      PNG_UNUSED(pos)
-
-      png_warning(png_ptr, m);
-#endif
-
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
-      png_ptr->flags = 0;
-#endif
-
-      return 0;
-   }
-
-   /* Success return. */
-   return 1;
-}
-
-/* Generic function to create a png_struct for either read or write - this
- * contains the common initialization.
- */
-PNG_FUNCTION(png_structp /* PRIVATE */,
-png_create_png_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
-    png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
-    png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED)
-{
-   png_struct create_struct;
-#  ifdef PNG_SETJMP_SUPPORTED
-      jmp_buf create_jmp_buf;
-#  endif
-
-   /* This temporary stack-allocated structure is used to provide a place to
-    * build enough context to allow the user provided memory allocator (if any)
-    * to be called.
-    */
-   memset(&create_struct, 0, (sizeof create_struct));
-
-   /* Added at libpng-1.2.6 */
-#  ifdef PNG_USER_LIMITS_SUPPORTED
-      create_struct.user_width_max = PNG_USER_WIDTH_MAX;
-      create_struct.user_height_max = PNG_USER_HEIGHT_MAX;
-
-#     ifdef PNG_USER_CHUNK_CACHE_MAX
-      /* Added at libpng-1.2.43 and 1.4.0 */
-      create_struct.user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX;
-#     endif
-
-#     ifdef PNG_USER_CHUNK_MALLOC_MAX
-      /* Added at libpng-1.2.43 and 1.4.1, required only for read but exists
-       * in png_struct regardless.
-       */
-      create_struct.user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX;
-#     endif
-#  endif
-
-   /* The following two API calls simply set fields in png_struct, so it is safe
-    * to do them now even though error handling is not yet set up.
-    */
-#  ifdef PNG_USER_MEM_SUPPORTED
-      png_set_mem_fn(&create_struct, mem_ptr, malloc_fn, free_fn);
-#  else
-      PNG_UNUSED(mem_ptr)
-      PNG_UNUSED(malloc_fn)
-      PNG_UNUSED(free_fn)
-#  endif
-
-   /* (*error_fn) can return control to the caller after the error_ptr is set,
-    * this will result in a memory leak unless the error_fn does something
-    * extremely sophisticated.  The design lacks merit but is implicit in the
-    * API.
-    */
-   png_set_error_fn(&create_struct, error_ptr, error_fn, warn_fn);
-
-#  ifdef PNG_SETJMP_SUPPORTED
-      if (!setjmp(create_jmp_buf))
-#  endif
-      {
-#  ifdef PNG_SETJMP_SUPPORTED
-         /* Temporarily fake out the longjmp information until we have
-          * successfully completed this function.  This only works if we have
-          * setjmp() support compiled in, but it is safe - this stuff should
-          * never happen.
-          */
-         create_struct.jmp_buf_ptr = &create_jmp_buf;
-         create_struct.jmp_buf_size = 0; /*stack allocation*/
-         create_struct.longjmp_fn = longjmp;
-#  endif
-         /* Call the general version checker (shared with read and write code):
-          */
-         if (png_user_version_check(&create_struct, user_png_ver) != 0)
-         {
-            png_structrp png_ptr = png_voidcast(png_structrp,
-                png_malloc_warn(&create_struct, (sizeof *png_ptr)));
-
-            if (png_ptr != NULL)
-            {
-               /* png_ptr->zstream holds a back-pointer to the png_struct, so
-                * this can only be done now:
-                */
-               create_struct.zstream.zalloc = png_zalloc;
-               create_struct.zstream.zfree = png_zfree;
-               create_struct.zstream.opaque = png_ptr;
-
-#              ifdef PNG_SETJMP_SUPPORTED
-               /* Eliminate the local error handling: */
-               create_struct.jmp_buf_ptr = NULL;
-               create_struct.jmp_buf_size = 0;
-               create_struct.longjmp_fn = 0;
-#              endif
-
-               *png_ptr = create_struct;
-
-               /* This is the successful return point */
-               return png_ptr;
-            }
-         }
-      }
-
-   /* A longjmp because of a bug in the application storage allocator or a
-    * simple failure to allocate the png_struct.
-    */
-   return NULL;
-}
-
-/* Allocate the memory for an info_struct for the application. */
-PNG_FUNCTION(png_infop,PNGAPI
-png_create_info_struct,(png_const_structrp png_ptr),PNG_ALLOCATED)
-{
-   png_inforp info_ptr;
-
-   png_debug(1, "in png_create_info_struct");
-
-   if (png_ptr == NULL)
-      return NULL;
-
-   /* Use the internal API that does not (or at least should not) error out, so
-    * that this call always returns ok.  The application typically sets up the
-    * error handling *after* creating the info_struct because this is the way it
-    * has always been done in 'example.c'.
-    */
-   info_ptr = png_voidcast(png_inforp, png_malloc_base(png_ptr,
-       (sizeof *info_ptr)));
-
-   if (info_ptr != NULL)
-      memset(info_ptr, 0, (sizeof *info_ptr));
-
-   return info_ptr;
-}
-
-/* This function frees the memory associated with a single info struct.
- * Normally, one would use either png_destroy_read_struct() or
- * png_destroy_write_struct() to free an info struct, but this may be
- * useful for some applications.  From libpng 1.6.0 this function is also used
- * internally to implement the png_info release part of the 'struct' destroy
- * APIs.  This ensures that all possible approaches free the same data (all of
- * it).
- */
-void PNGAPI
-png_destroy_info_struct(png_const_structrp png_ptr, png_infopp info_ptr_ptr)
-{
-   png_inforp info_ptr = NULL;
-
-   png_debug(1, "in png_destroy_info_struct");
-
-   if (png_ptr == NULL)
-      return;
-
-   if (info_ptr_ptr != NULL)
-      info_ptr = *info_ptr_ptr;
-
-   if (info_ptr != NULL)
-   {
-      /* Do this first in case of an error below; if the app implements its own
-       * memory management this can lead to png_free calling png_error, which
-       * will abort this routine and return control to the app error handler.
-       * An infinite loop may result if it then tries to free the same info
-       * ptr.
-       */
-      *info_ptr_ptr = NULL;
-
-      png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
-      memset(info_ptr, 0, (sizeof *info_ptr));
-      png_free(png_ptr, info_ptr);
-   }
-}
-
-/* Initialize the info structure.  This is now an internal function (0.89)
- * and applications using it are urged to use png_create_info_struct()
- * instead.  Use deprecated in 1.6.0, internal use removed (used internally it
- * is just a memset).
- *
- * NOTE: it is almost inconceivable that this API is used because it bypasses
- * the user-memory mechanism and the user error handling/warning mechanisms in
- * those cases where it does anything other than a memset.
- */
-PNG_FUNCTION(void,PNGAPI
-png_info_init_3,(png_infopp ptr_ptr, png_size_t png_info_struct_size),
-    PNG_DEPRECATED)
-{
-   png_inforp info_ptr = *ptr_ptr;
-
-   png_debug(1, "in png_info_init_3");
-
-   if (info_ptr == NULL)
-      return;
-
-   if ((sizeof (png_info)) > png_info_struct_size)
-   {
-      *ptr_ptr = NULL;
-      /* The following line is why this API should not be used: */
-      free(info_ptr);
-      info_ptr = png_voidcast(png_inforp, png_malloc_base(NULL,
-          (sizeof *info_ptr)));
-      if (info_ptr == NULL)
-         return;
-      *ptr_ptr = info_ptr;
-   }
-
-   /* Set everything to 0 */
-   memset(info_ptr, 0, (sizeof *info_ptr));
-}
-
-/* The following API is not called internally */
-void PNGAPI
-png_data_freer(png_const_structrp png_ptr, png_inforp info_ptr,
-    int freer, png_uint_32 mask)
-{
-   png_debug(1, "in png_data_freer");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   if (freer == PNG_DESTROY_WILL_FREE_DATA)
-      info_ptr->free_me |= mask;
-
-   else if (freer == PNG_USER_WILL_FREE_DATA)
-      info_ptr->free_me &= ~mask;
-
-   else
-      png_error(png_ptr, "Unknown freer parameter in png_data_freer");
-}
-
-void PNGAPI
-png_free_data(png_const_structrp png_ptr, png_inforp info_ptr, png_uint_32 mask,
-    int num)
-{
-   png_debug(1, "in png_free_data");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-#ifdef PNG_TEXT_SUPPORTED
-   /* Free text item num or (if num == -1) all text items */
-   if (info_ptr->text != NULL &&
-       ((mask & PNG_FREE_TEXT) & info_ptr->free_me) != 0)
-   {
-      if (num != -1)
-      {
-         png_free(png_ptr, info_ptr->text[num].key);
-         info_ptr->text[num].key = NULL;
-      }
-
-      else
-      {
-         int i;
-
-         for (i = 0; i < info_ptr->num_text; i++)
-            png_free(png_ptr, info_ptr->text[i].key);
-
-         png_free(png_ptr, info_ptr->text);
-         info_ptr->text = NULL;
-         info_ptr->num_text = 0;
-         info_ptr->max_text = 0;
-      }
-   }
-#endif
-
-#ifdef PNG_tRNS_SUPPORTED
-   /* Free any tRNS entry */
-   if (((mask & PNG_FREE_TRNS) & info_ptr->free_me) != 0)
-   {
-      info_ptr->valid &= ~PNG_INFO_tRNS;
-      png_free(png_ptr, info_ptr->trans_alpha);
-      info_ptr->trans_alpha = NULL;
-      info_ptr->num_trans = 0;
-   }
-#endif
-
-#ifdef PNG_sCAL_SUPPORTED
-   /* Free any sCAL entry */
-   if (((mask & PNG_FREE_SCAL) & info_ptr->free_me) != 0)
-   {
-      png_free(png_ptr, info_ptr->scal_s_width);
-      png_free(png_ptr, info_ptr->scal_s_height);
-      info_ptr->scal_s_width = NULL;
-      info_ptr->scal_s_height = NULL;
-      info_ptr->valid &= ~PNG_INFO_sCAL;
-   }
-#endif
-
-#ifdef PNG_pCAL_SUPPORTED
-   /* Free any pCAL entry */
-   if (((mask & PNG_FREE_PCAL) & info_ptr->free_me) != 0)
-   {
-      png_free(png_ptr, info_ptr->pcal_purpose);
-      png_free(png_ptr, info_ptr->pcal_units);
-      info_ptr->pcal_purpose = NULL;
-      info_ptr->pcal_units = NULL;
-
-      if (info_ptr->pcal_params != NULL)
-         {
-            int i;
-
-            for (i = 0; i < info_ptr->pcal_nparams; i++)
-               png_free(png_ptr, info_ptr->pcal_params[i]);
-
-            png_free(png_ptr, info_ptr->pcal_params);
-            info_ptr->pcal_params = NULL;
-         }
-      info_ptr->valid &= ~PNG_INFO_pCAL;
-   }
-#endif
-
-#ifdef PNG_iCCP_SUPPORTED
-   /* Free any profile entry */
-   if (((mask & PNG_FREE_ICCP) & info_ptr->free_me) != 0)
-   {
-      png_free(png_ptr, info_ptr->iccp_name);
-      png_free(png_ptr, info_ptr->iccp_profile);
-      info_ptr->iccp_name = NULL;
-      info_ptr->iccp_profile = NULL;
-      info_ptr->valid &= ~PNG_INFO_iCCP;
-   }
-#endif
-
-#ifdef PNG_sPLT_SUPPORTED
-   /* Free a given sPLT entry, or (if num == -1) all sPLT entries */
-   if (info_ptr->splt_palettes != NULL &&
-       ((mask & PNG_FREE_SPLT) & info_ptr->free_me) != 0)
-   {
-      if (num != -1)
-      {
-         png_free(png_ptr, info_ptr->splt_palettes[num].name);
-         png_free(png_ptr, info_ptr->splt_palettes[num].entries);
-         info_ptr->splt_palettes[num].name = NULL;
-         info_ptr->splt_palettes[num].entries = NULL;
-      }
-
-      else
-      {
-         int i;
-
-         for (i = 0; i < info_ptr->splt_palettes_num; i++)
-         {
-            png_free(png_ptr, info_ptr->splt_palettes[i].name);
-            png_free(png_ptr, info_ptr->splt_palettes[i].entries);
-         }
-
-         png_free(png_ptr, info_ptr->splt_palettes);
-         info_ptr->splt_palettes = NULL;
-         info_ptr->splt_palettes_num = 0;
-         info_ptr->valid &= ~PNG_INFO_sPLT;
-      }
-   }
-#endif
-
-#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
-   if (info_ptr->unknown_chunks != NULL &&
-       ((mask & PNG_FREE_UNKN) & info_ptr->free_me) != 0)
-   {
-      if (num != -1)
-      {
-          png_free(png_ptr, info_ptr->unknown_chunks[num].data);
-          info_ptr->unknown_chunks[num].data = NULL;
-      }
-
-      else
-      {
-         int i;
-
-         for (i = 0; i < info_ptr->unknown_chunks_num; i++)
-            png_free(png_ptr, info_ptr->unknown_chunks[i].data);
-
-         png_free(png_ptr, info_ptr->unknown_chunks);
-         info_ptr->unknown_chunks = NULL;
-         info_ptr->unknown_chunks_num = 0;
-      }
-   }
-#endif
-
-#ifdef PNG_eXIf_SUPPORTED
-   /* Free any eXIf entry */
-   if (((mask & PNG_FREE_EXIF) & info_ptr->free_me) != 0)
-   {
-# ifdef PNG_READ_eXIf_SUPPORTED
-      if (info_ptr->eXIf_buf)
-      {
-         png_free(png_ptr, info_ptr->eXIf_buf);
-         info_ptr->eXIf_buf = NULL;
-      }
-# endif
-      if (info_ptr->exif)
-      {
-         png_free(png_ptr, info_ptr->exif);
-         info_ptr->exif = NULL;
-      }
-      info_ptr->valid &= ~PNG_INFO_eXIf;
-   }
-#endif
-
-#ifdef PNG_hIST_SUPPORTED
-   /* Free any hIST entry */
-   if (((mask & PNG_FREE_HIST) & info_ptr->free_me) != 0)
-   {
-      png_free(png_ptr, info_ptr->hist);
-      info_ptr->hist = NULL;
-      info_ptr->valid &= ~PNG_INFO_hIST;
-   }
-#endif
-
-   /* Free any PLTE entry that was internally allocated */
-   if (((mask & PNG_FREE_PLTE) & info_ptr->free_me) != 0)
-   {
-      png_free(png_ptr, info_ptr->palette);
-      info_ptr->palette = NULL;
-      info_ptr->valid &= ~PNG_INFO_PLTE;
-      info_ptr->num_palette = 0;
-   }
-
-#ifdef PNG_INFO_IMAGE_SUPPORTED
-   /* Free any image bits attached to the info structure */
-   if (((mask & PNG_FREE_ROWS) & info_ptr->free_me) != 0)
-   {
-      if (info_ptr->row_pointers != NULL)
-      {
-         png_uint_32 row;
-         for (row = 0; row < info_ptr->height; row++)
-            png_free(png_ptr, info_ptr->row_pointers[row]);
-
-         png_free(png_ptr, info_ptr->row_pointers);
-         info_ptr->row_pointers = NULL;
-      }
-      info_ptr->valid &= ~PNG_INFO_IDAT;
-   }
-#endif
-
-   if (num != -1)
-      mask &= ~PNG_FREE_MUL;
-
-   info_ptr->free_me &= ~mask;
-}
-#endif /* READ || WRITE */
-
-/* This function returns a pointer to the io_ptr associated with the user
- * functions.  The application should free any memory associated with this
- * pointer before png_write_destroy() or png_read_destroy() are called.
- */
-png_voidp PNGAPI
-png_get_io_ptr(png_const_structrp png_ptr)
-{
-   if (png_ptr == NULL)
-      return (NULL);
-
-   return (png_ptr->io_ptr);
-}
-
-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-#  ifdef PNG_STDIO_SUPPORTED
-/* Initialize the default input/output functions for the PNG file.  If you
- * use your own read or write routines, you can call either png_set_read_fn()
- * or png_set_write_fn() instead of png_init_io().  If you have defined
- * PNG_NO_STDIO or otherwise disabled PNG_STDIO_SUPPORTED, you must use a
- * function of your own because "FILE *" isn't necessarily available.
- */
-void PNGAPI
-png_init_io(png_structrp png_ptr, png_FILE_p fp)
-{
-   png_debug(1, "in png_init_io");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->io_ptr = (png_voidp)fp;
-}
-#  endif
-
-#  ifdef PNG_SAVE_INT_32_SUPPORTED
-/* PNG signed integers are saved in 32-bit 2's complement format.  ANSI C-90
- * defines a cast of a signed integer to an unsigned integer either to preserve
- * the value, if it is positive, or to calculate:
- *
- *     (UNSIGNED_MAX+1) + integer
- *
- * Where UNSIGNED_MAX is the appropriate maximum unsigned value, so when the
- * negative integral value is added the result will be an unsigned value
- * correspnding to the 2's complement representation.
- */
-void PNGAPI
-png_save_int_32(png_bytep buf, png_int_32 i)
-{
-   png_save_uint_32(buf, (png_uint_32)i);
-}
-#  endif
-
-#  ifdef PNG_TIME_RFC1123_SUPPORTED
-/* Convert the supplied time into an RFC 1123 string suitable for use in
- * a "Creation Time" or other text-based time string.
- */
-int PNGAPI
-png_convert_to_rfc1123_buffer(char out[29], png_const_timep ptime)
-{
-   static PNG_CONST char short_months[12][4] =
-        {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
-         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
-
-   if (out == NULL)
-      return 0;
-
-   if (ptime->year > 9999 /* RFC1123 limitation */ ||
-       ptime->month == 0    ||  ptime->month > 12  ||
-       ptime->day   == 0    ||  ptime->day   > 31  ||
-       ptime->hour  > 23    ||  ptime->minute > 59 ||
-       ptime->second > 60)
-      return 0;
-
-   {
-      size_t pos = 0;
-      char number_buf[5]; /* enough for a four-digit year */
-
-#     define APPEND_STRING(string) pos = png_safecat(out, 29, pos, (string))
-#     define APPEND_NUMBER(format, value)\
-         APPEND_STRING(PNG_FORMAT_NUMBER(number_buf, format, (value)))
-#     define APPEND(ch) if (pos < 28) out[pos++] = (ch)
-
-      APPEND_NUMBER(PNG_NUMBER_FORMAT_u, (unsigned)ptime->day);
-      APPEND(' ');
-      APPEND_STRING(short_months[(ptime->month - 1)]);
-      APPEND(' ');
-      APPEND_NUMBER(PNG_NUMBER_FORMAT_u, ptime->year);
-      APPEND(' ');
-      APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->hour);
-      APPEND(':');
-      APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->minute);
-      APPEND(':');
-      APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->second);
-      APPEND_STRING(" +0000"); /* This reliably terminates the buffer */
-      PNG_UNUSED (pos)
-
-#     undef APPEND
-#     undef APPEND_NUMBER
-#     undef APPEND_STRING
-   }
-
-   return 1;
-}
-
-#    if PNG_LIBPNG_VER < 10700
-/* To do: remove the following from libpng-1.7 */
-/* Original API that uses a private buffer in png_struct.
- * Deprecated because it causes png_struct to carry a spurious temporary
- * buffer (png_struct::time_buffer), better to have the caller pass this in.
- */
-png_const_charp PNGAPI
-png_convert_to_rfc1123(png_structrp png_ptr, png_const_timep ptime)
-{
-   if (png_ptr != NULL)
-   {
-      /* The only failure above if png_ptr != NULL is from an invalid ptime */
-      if (png_convert_to_rfc1123_buffer(png_ptr->time_buffer, ptime) == 0)
-         png_warning(png_ptr, "Ignoring invalid time value");
-
-      else
-         return png_ptr->time_buffer;
-   }
-
-   return NULL;
-}
-#    endif /* LIBPNG_VER < 10700 */
-#  endif /* TIME_RFC1123 */
-
-#endif /* READ || WRITE */
-
-png_const_charp PNGAPI
-png_get_copyright(png_const_structrp png_ptr)
-{
-   PNG_UNUSED(png_ptr)  /* Silence compiler warning about unused png_ptr */
-#ifdef PNG_STRING_COPYRIGHT
-   return PNG_STRING_COPYRIGHT
-#else
-#  ifdef __STDC__
-   return PNG_STRING_NEWLINE \
-      "libpng version 1.6.34 - September 29, 2017" PNG_STRING_NEWLINE \
-      "Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson" \
-      PNG_STRING_NEWLINE \
-      "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
-      "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
-      PNG_STRING_NEWLINE;
-#  else
-   return "libpng version 1.6.34 - September 29, 2017\
-      Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson\
-      Copyright (c) 1996-1997 Andreas Dilger\
-      Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
-#  endif
-#endif
-}
-
-/* The following return the library version as a short string in the
- * format 1.0.0 through 99.99.99zz.  To get the version of *.h files
- * used with your application, print out PNG_LIBPNG_VER_STRING, which
- * is defined in png.h.
- * Note: now there is no difference between png_get_libpng_ver() and
- * png_get_header_ver().  Due to the version_nn_nn_nn typedef guard,
- * it is guaranteed that png.c uses the correct version of png.h.
- */
-png_const_charp PNGAPI
-png_get_libpng_ver(png_const_structrp png_ptr)
-{
-   /* Version of *.c files used when building libpng */
-   return png_get_header_ver(png_ptr);
-}
-
-png_const_charp PNGAPI
-png_get_header_ver(png_const_structrp png_ptr)
-{
-   /* Version of *.h files used when building libpng */
-   PNG_UNUSED(png_ptr)  /* Silence compiler warning about unused png_ptr */
-   return PNG_LIBPNG_VER_STRING;
-}
-
-png_const_charp PNGAPI
-png_get_header_version(png_const_structrp png_ptr)
-{
-   /* Returns longer string containing both version and date */
-   PNG_UNUSED(png_ptr)  /* Silence compiler warning about unused png_ptr */
-#ifdef __STDC__
-   return PNG_HEADER_VERSION_STRING
-#  ifndef PNG_READ_SUPPORTED
-      " (NO READ SUPPORT)"
-#  endif
-      PNG_STRING_NEWLINE;
-#else
-   return PNG_HEADER_VERSION_STRING;
-#endif
-}
-
-#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
-/* NOTE: this routine is not used internally! */
-/* Build a grayscale palette.  Palette is assumed to be 1 << bit_depth
- * large of png_color.  This lets grayscale images be treated as
- * paletted.  Most useful for gamma correction and simplification
- * of code.  This API is not used internally.
- */
-void PNGAPI
-png_build_grayscale_palette(int bit_depth, png_colorp palette)
-{
-   int num_palette;
-   int color_inc;
-   int i;
-   int v;
-
-   png_debug(1, "in png_do_build_grayscale_palette");
-
-   if (palette == NULL)
-      return;
-
-   switch (bit_depth)
-   {
-      case 1:
-         num_palette = 2;
-         color_inc = 0xff;
-         break;
-
-      case 2:
-         num_palette = 4;
-         color_inc = 0x55;
-         break;
-
-      case 4:
-         num_palette = 16;
-         color_inc = 0x11;
-         break;
-
-      case 8:
-         num_palette = 256;
-         color_inc = 1;
-         break;
-
-      default:
-         num_palette = 0;
-         color_inc = 0;
-         break;
-   }
-
-   for (i = 0, v = 0; i < num_palette; i++, v += color_inc)
-   {
-      palette[i].red = (png_byte)(v & 0xff);
-      palette[i].green = (png_byte)(v & 0xff);
-      palette[i].blue = (png_byte)(v & 0xff);
-   }
-}
-#endif
-
-#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
-int PNGAPI
-png_handle_as_unknown(png_const_structrp png_ptr, png_const_bytep chunk_name)
-{
-   /* Check chunk_name and return "keep" value if it's on the list, else 0 */
-   png_const_bytep p, p_end;
-
-   if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list == 0)
-      return PNG_HANDLE_CHUNK_AS_DEFAULT;
-
-   p_end = png_ptr->chunk_list;
-   p = p_end + png_ptr->num_chunk_list*5; /* beyond end */
-
-   /* The code is the fifth byte after each four byte string.  Historically this
-    * code was always searched from the end of the list, this is no longer
-    * necessary because the 'set' routine handles duplicate entries correcty.
-    */
-   do /* num_chunk_list > 0, so at least one */
-   {
-      p -= 5;
-
-      if (memcmp(chunk_name, p, 4) == 0)
-         return p[4];
-   }
-   while (p > p_end);
-
-   /* This means that known chunks should be processed and unknown chunks should
-    * be handled according to the value of png_ptr->unknown_default; this can be
-    * confusing because, as a result, there are two levels of defaulting for
-    * unknown chunks.
-    */
-   return PNG_HANDLE_CHUNK_AS_DEFAULT;
-}
-
-#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
-   defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
-int /* PRIVATE */
-png_chunk_unknown_handling(png_const_structrp png_ptr, png_uint_32 chunk_name)
-{
-   png_byte chunk_string[5];
-
-   PNG_CSTRING_FROM_CHUNK(chunk_string, chunk_name);
-   return png_handle_as_unknown(png_ptr, chunk_string);
-}
-#endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */
-#endif /* SET_UNKNOWN_CHUNKS */
-
-#ifdef PNG_READ_SUPPORTED
-/* This function, added to libpng-1.0.6g, is untested. */
-int PNGAPI
-png_reset_zstream(png_structrp png_ptr)
-{
-   if (png_ptr == NULL)
-      return Z_STREAM_ERROR;
-
-   /* WARNING: this resets the window bits to the maximum! */
-   return (inflateReset(&png_ptr->zstream));
-}
-#endif /* READ */
-
-/* This function was added to libpng-1.0.7 */
-png_uint_32 PNGAPI
-png_access_version_number(void)
-{
-   /* Version of *.c files used when building libpng */
-   return((png_uint_32)PNG_LIBPNG_VER);
-}
-
-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-/* Ensure that png_ptr->zstream.msg holds some appropriate error message string.
- * If it doesn't 'ret' is used to set it to something appropriate, even in cases
- * like Z_OK or Z_STREAM_END where the error code is apparently a success code.
- */
-void /* PRIVATE */
-png_zstream_error(png_structrp png_ptr, int ret)
-{
-   /* Translate 'ret' into an appropriate error string, priority is given to the
-    * one in zstream if set.  This always returns a string, even in cases like
-    * Z_OK or Z_STREAM_END where the error code is a success code.
-    */
-   if (png_ptr->zstream.msg == NULL) switch (ret)
-   {
-      default:
-      case Z_OK:
-         png_ptr->zstream.msg = PNGZ_MSG_CAST("unexpected zlib return code");
-         break;
-
-      case Z_STREAM_END:
-         /* Normal exit */
-         png_ptr->zstream.msg = PNGZ_MSG_CAST("unexpected end of LZ stream");
-         break;
-
-      case Z_NEED_DICT:
-         /* This means the deflate stream did not have a dictionary; this
-          * indicates a bogus PNG.
-          */
-         png_ptr->zstream.msg = PNGZ_MSG_CAST("missing LZ dictionary");
-         break;
-
-      case Z_ERRNO:
-         /* gz APIs only: should not happen */
-         png_ptr->zstream.msg = PNGZ_MSG_CAST("zlib IO error");
-         break;
-
-      case Z_STREAM_ERROR:
-         /* internal libpng error */
-         png_ptr->zstream.msg = PNGZ_MSG_CAST("bad parameters to zlib");
-         break;
-
-      case Z_DATA_ERROR:
-         png_ptr->zstream.msg = PNGZ_MSG_CAST("damaged LZ stream");
-         break;
-
-      case Z_MEM_ERROR:
-         png_ptr->zstream.msg = PNGZ_MSG_CAST("insufficient memory");
-         break;
-
-      case Z_BUF_ERROR:
-         /* End of input or output; not a problem if the caller is doing
-          * incremental read or write.
-          */
-         png_ptr->zstream.msg = PNGZ_MSG_CAST("truncated");
-         break;
-
-      case Z_VERSION_ERROR:
-         png_ptr->zstream.msg = PNGZ_MSG_CAST("unsupported zlib version");
-         break;
-
-      case PNG_UNEXPECTED_ZLIB_RETURN:
-         /* Compile errors here mean that zlib now uses the value co-opted in
-          * pngpriv.h for PNG_UNEXPECTED_ZLIB_RETURN; update the switch above
-          * and change pngpriv.h.  Note that this message is "... return",
-          * whereas the default/Z_OK one is "... return code".
-          */
-         png_ptr->zstream.msg = PNGZ_MSG_CAST("unexpected zlib return");
-         break;
-   }
-}
-
-/* png_convert_size: a PNGAPI but no longer in png.h, so deleted
- * at libpng 1.5.5!
- */
-
-/* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */
-#ifdef PNG_GAMMA_SUPPORTED /* always set if COLORSPACE */
-static int
-png_colorspace_check_gamma(png_const_structrp png_ptr,
-    png_colorspacerp colorspace, png_fixed_point gAMA, int from)
-   /* This is called to check a new gamma value against an existing one.  The
-    * routine returns false if the new gamma value should not be written.
-    *
-    * 'from' says where the new gamma value comes from:
-    *
-    *    0: the new gamma value is the libpng estimate for an ICC profile
-    *    1: the new gamma value comes from a gAMA chunk
-    *    2: the new gamma value comes from an sRGB chunk
-    */
-{
-   png_fixed_point gtest;
-
-   if ((colorspace->flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&
-       (png_muldiv(&gtest, colorspace->gamma, PNG_FP_1, gAMA) == 0  ||
-      png_gamma_significant(gtest) != 0))
-   {
-      /* Either this is an sRGB image, in which case the calculated gamma
-       * approximation should match, or this is an image with a profile and the
-       * value libpng calculates for the gamma of the profile does not match the
-       * value recorded in the file.  The former, sRGB, case is an error, the
-       * latter is just a warning.
-       */
-      if ((colorspace->flags & PNG_COLORSPACE_FROM_sRGB) != 0 || from == 2)
-      {
-         png_chunk_report(png_ptr, "gamma value does not match sRGB",
-             PNG_CHUNK_ERROR);
-         /* Do not overwrite an sRGB value */
-         return from == 2;
-      }
-
-      else /* sRGB tag not involved */
-      {
-         png_chunk_report(png_ptr, "gamma value does not match libpng estimate",
-             PNG_CHUNK_WARNING);
-         return from == 1;
-      }
-   }
-
-   return 1;
-}
-
-void /* PRIVATE */
-png_colorspace_set_gamma(png_const_structrp png_ptr,
-    png_colorspacerp colorspace, png_fixed_point gAMA)
-{
-   /* Changed in libpng-1.5.4 to limit the values to ensure overflow can't
-    * occur.  Since the fixed point representation is asymetrical it is
-    * possible for 1/gamma to overflow the limit of 21474 and this means the
-    * gamma value must be at least 5/100000 and hence at most 20000.0.  For
-    * safety the limits here are a little narrower.  The values are 0.00016 to
-    * 6250.0, which are truly ridiculous gamma values (and will produce
-    * displays that are all black or all white.)
-    *
-    * In 1.6.0 this test replaces the ones in pngrutil.c, in the gAMA chunk
-    * handling code, which only required the value to be >0.
-    */
-   png_const_charp errmsg;
-
-   if (gAMA < 16 || gAMA > 625000000)
-      errmsg = "gamma value out of range";
-
-#  ifdef PNG_READ_gAMA_SUPPORTED
-   /* Allow the application to set the gamma value more than once */
-   else if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
-      (colorspace->flags & PNG_COLORSPACE_FROM_gAMA) != 0)
-      errmsg = "duplicate";
-#  endif
-
-   /* Do nothing if the colorspace is already invalid */
-   else if ((colorspace->flags & PNG_COLORSPACE_INVALID) != 0)
-      return;
-
-   else
-   {
-      if (png_colorspace_check_gamma(png_ptr, colorspace, gAMA,
-          1/*from gAMA*/) != 0)
-      {
-         /* Store this gamma value. */
-         colorspace->gamma = gAMA;
-         colorspace->flags |=
-            (PNG_COLORSPACE_HAVE_GAMMA | PNG_COLORSPACE_FROM_gAMA);
-      }
-
-      /* At present if the check_gamma test fails the gamma of the colorspace is
-       * not updated however the colorspace is not invalidated.  This
-       * corresponds to the case where the existing gamma comes from an sRGB
-       * chunk or profile.  An error message has already been output.
-       */
-      return;
-   }
-
-   /* Error exit - errmsg has been set. */
-   colorspace->flags |= PNG_COLORSPACE_INVALID;
-   png_chunk_report(png_ptr, errmsg, PNG_CHUNK_WRITE_ERROR);
-}
-
-void /* PRIVATE */
-png_colorspace_sync_info(png_const_structrp png_ptr, png_inforp info_ptr)
-{
-   if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) != 0)
-   {
-      /* Everything is invalid */
-      info_ptr->valid &= ~(PNG_INFO_gAMA|PNG_INFO_cHRM|PNG_INFO_sRGB|
-         PNG_INFO_iCCP);
-
-#     ifdef PNG_COLORSPACE_SUPPORTED
-      /* Clean up the iCCP profile now if it won't be used. */
-      png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, -1/*not used*/);
-#     else
-      PNG_UNUSED(png_ptr)
-#     endif
-   }
-
-   else
-   {
-#     ifdef PNG_COLORSPACE_SUPPORTED
-      /* Leave the INFO_iCCP flag set if the pngset.c code has already set
-       * it; this allows a PNG to contain a profile which matches sRGB and
-       * yet still have that profile retrievable by the application.
-       */
-      if ((info_ptr->colorspace.flags & PNG_COLORSPACE_MATCHES_sRGB) != 0)
-         info_ptr->valid |= PNG_INFO_sRGB;
-
-      else
-         info_ptr->valid &= ~PNG_INFO_sRGB;
-
-      if ((info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
-         info_ptr->valid |= PNG_INFO_cHRM;
-
-      else
-         info_ptr->valid &= ~PNG_INFO_cHRM;
-#     endif
-
-      if ((info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0)
-         info_ptr->valid |= PNG_INFO_gAMA;
-
-      else
-         info_ptr->valid &= ~PNG_INFO_gAMA;
-   }
-}
-
-#ifdef PNG_READ_SUPPORTED
-void /* PRIVATE */
-png_colorspace_sync(png_const_structrp png_ptr, png_inforp info_ptr)
-{
-   if (info_ptr == NULL) /* reduce code size; check here not in the caller */
-      return;
-
-   info_ptr->colorspace = png_ptr->colorspace;
-   png_colorspace_sync_info(png_ptr, info_ptr);
-}
-#endif
-#endif /* GAMMA */
-
-#ifdef PNG_COLORSPACE_SUPPORTED
-/* Added at libpng-1.5.5 to support read and write of true CIEXYZ values for
- * cHRM, as opposed to using chromaticities.  These internal APIs return
- * non-zero on a parameter error.  The X, Y and Z values are required to be
- * positive and less than 1.0.
- */
-static int
-png_xy_from_XYZ(png_xy *xy, const png_XYZ *XYZ)
-{
-   png_int_32 d, dwhite, whiteX, whiteY;
-
-   d = XYZ->red_X + XYZ->red_Y + XYZ->red_Z;
-   if (png_muldiv(&xy->redx, XYZ->red_X, PNG_FP_1, d) == 0)
-      return 1;
-   if (png_muldiv(&xy->redy, XYZ->red_Y, PNG_FP_1, d) == 0)
-      return 1;
-   dwhite = d;
-   whiteX = XYZ->red_X;
-   whiteY = XYZ->red_Y;
-
-   d = XYZ->green_X + XYZ->green_Y + XYZ->green_Z;
-   if (png_muldiv(&xy->greenx, XYZ->green_X, PNG_FP_1, d) == 0)
-      return 1;
-   if (png_muldiv(&xy->greeny, XYZ->green_Y, PNG_FP_1, d) == 0)
-      return 1;
-   dwhite += d;
-   whiteX += XYZ->green_X;
-   whiteY += XYZ->green_Y;
-
-   d = XYZ->blue_X + XYZ->blue_Y + XYZ->blue_Z;
-   if (png_muldiv(&xy->bluex, XYZ->blue_X, PNG_FP_1, d) == 0)
-      return 1;
-   if (png_muldiv(&xy->bluey, XYZ->blue_Y, PNG_FP_1, d) == 0)
-      return 1;
-   dwhite += d;
-   whiteX += XYZ->blue_X;
-   whiteY += XYZ->blue_Y;
-
-   /* The reference white is simply the sum of the end-point (X,Y,Z) vectors,
-    * thus:
-    */
-   if (png_muldiv(&xy->whitex, whiteX, PNG_FP_1, dwhite) == 0)
-      return 1;
-   if (png_muldiv(&xy->whitey, whiteY, PNG_FP_1, dwhite) == 0)
-      return 1;
-
-   return 0;
-}
-
-static int
-png_XYZ_from_xy(png_XYZ *XYZ, const png_xy *xy)
-{
-   png_fixed_point red_inverse, green_inverse, blue_scale;
-   png_fixed_point left, right, denominator;
-
-   /* Check xy and, implicitly, z.  Note that wide gamut color spaces typically
-    * have end points with 0 tristimulus values (these are impossible end
-    * points, but they are used to cover the possible colors).  We check
-    * xy->whitey against 5, not 0, to avoid a possible integer overflow.
-    */
-   if (xy->redx   < 0 || xy->redx > PNG_FP_1) return 1;
-   if (xy->redy   < 0 || xy->redy > PNG_FP_1-xy->redx) return 1;
-   if (xy->greenx < 0 || xy->greenx > PNG_FP_1) return 1;
-   if (xy->greeny < 0 || xy->greeny > PNG_FP_1-xy->greenx) return 1;
-   if (xy->bluex  < 0 || xy->bluex > PNG_FP_1) return 1;
-   if (xy->bluey  < 0 || xy->bluey > PNG_FP_1-xy->bluex) return 1;
-   if (xy->whitex < 0 || xy->whitex > PNG_FP_1) return 1;
-   if (xy->whitey < 5 || xy->whitey > PNG_FP_1-xy->whitex) return 1;
-
-   /* The reverse calculation is more difficult because the original tristimulus
-    * value had 9 independent values (red,green,blue)x(X,Y,Z) however only 8
-    * derived values were recorded in the cHRM chunk;
-    * (red,green,blue,white)x(x,y).  This loses one degree of freedom and
-    * therefore an arbitrary ninth value has to be introduced to undo the
-    * original transformations.
-    *
-    * Think of the original end-points as points in (X,Y,Z) space.  The
-    * chromaticity values (c) have the property:
-    *
-    *           C
-    *   c = ---------
-    *       X + Y + Z
-    *
-    * For each c (x,y,z) from the corresponding original C (X,Y,Z).  Thus the
-    * three chromaticity values (x,y,z) for each end-point obey the
-    * relationship:
-    *
-    *   x + y + z = 1
-    *
-    * This describes the plane in (X,Y,Z) space that intersects each axis at the
-    * value 1.0; call this the chromaticity plane.  Thus the chromaticity
-    * calculation has scaled each end-point so that it is on the x+y+z=1 plane
-    * and chromaticity is the intersection of the vector from the origin to the
-    * (X,Y,Z) value with the chromaticity plane.
-    *
-    * To fully invert the chromaticity calculation we would need the three
-    * end-point scale factors, (red-scale, green-scale, blue-scale), but these
-    * were not recorded.  Instead we calculated the reference white (X,Y,Z) and
-    * recorded the chromaticity of this.  The reference white (X,Y,Z) would have
-    * given all three of the scale factors since:
-    *
-    *    color-C = color-c * color-scale
-    *    white-C = red-C + green-C + blue-C
-    *            = red-c*red-scale + green-c*green-scale + blue-c*blue-scale
-    *
-    * But cHRM records only white-x and white-y, so we have lost the white scale
-    * factor:
-    *
-    *    white-C = white-c*white-scale
-    *
-    * To handle this the inverse transformation makes an arbitrary assumption
-    * about white-scale:
-    *
-    *    Assume: white-Y = 1.0
-    *    Hence:  white-scale = 1/white-y
-    *    Or:     red-Y + green-Y + blue-Y = 1.0
-    *
-    * Notice the last statement of the assumption gives an equation in three of
-    * the nine values we want to calculate.  8 more equations come from the
-    * above routine as summarised at the top above (the chromaticity
-    * calculation):
-    *
-    *    Given: color-x = color-X / (color-X + color-Y + color-Z)
-    *    Hence: (color-x - 1)*color-X + color.x*color-Y + color.x*color-Z = 0
-    *
-    * This is 9 simultaneous equations in the 9 variables "color-C" and can be
-    * solved by Cramer's rule.  Cramer's rule requires calculating 10 9x9 matrix
-    * determinants, however this is not as bad as it seems because only 28 of
-    * the total of 90 terms in the various matrices are non-zero.  Nevertheless
-    * Cramer's rule is notoriously numerically unstable because the determinant
-    * calculation involves the difference of large, but similar, numbers.  It is
-    * difficult to be sure that the calculation is stable for real world values
-    * and it is certain that it becomes unstable where the end points are close
-    * together.
-    *
-    * So this code uses the perhaps slightly less optimal but more
-    * understandable and totally obvious approach of calculating color-scale.
-    *
-    * This algorithm depends on the precision in white-scale and that is
-    * (1/white-y), so we can immediately see that as white-y approaches 0 the
-    * accuracy inherent in the cHRM chunk drops off substantially.
-    *
-    * libpng arithmetic: a simple inversion of the above equations
-    * ------------------------------------------------------------
-    *
-    *    white_scale = 1/white-y
-    *    white-X = white-x * white-scale
-    *    white-Y = 1.0
-    *    white-Z = (1 - white-x - white-y) * white_scale
-    *
-    *    white-C = red-C + green-C + blue-C
-    *            = red-c*red-scale + green-c*green-scale + blue-c*blue-scale
-    *
-    * This gives us three equations in (red-scale,green-scale,blue-scale) where
-    * all the coefficients are now known:
-    *
-    *    red-x*red-scale + green-x*green-scale + blue-x*blue-scale
-    *       = white-x/white-y
-    *    red-y*red-scale + green-y*green-scale + blue-y*blue-scale = 1
-    *    red-z*red-scale + green-z*green-scale + blue-z*blue-scale
-    *       = (1 - white-x - white-y)/white-y
-    *
-    * In the last equation color-z is (1 - color-x - color-y) so we can add all
-    * three equations together to get an alternative third:
-    *
-    *    red-scale + green-scale + blue-scale = 1/white-y = white-scale
-    *
-    * So now we have a Cramer's rule solution where the determinants are just
-    * 3x3 - far more tractible.  Unfortunately 3x3 determinants still involve
-    * multiplication of three coefficients so we can't guarantee to avoid
-    * overflow in the libpng fixed point representation.  Using Cramer's rule in
-    * floating point is probably a good choice here, but it's not an option for
-    * fixed point.  Instead proceed to simplify the first two equations by
-    * eliminating what is likely to be the largest value, blue-scale:
-    *
-    *    blue-scale = white-scale - red-scale - green-scale
-    *
-    * Hence:
-    *
-    *    (red-x - blue-x)*red-scale + (green-x - blue-x)*green-scale =
-    *                (white-x - blue-x)*white-scale
-    *
-    *    (red-y - blue-y)*red-scale + (green-y - blue-y)*green-scale =
-    *                1 - blue-y*white-scale
-    *
-    * And now we can trivially solve for (red-scale,green-scale):
-    *
-    *    green-scale =
-    *                (white-x - blue-x)*white-scale - (red-x - blue-x)*red-scale
-    *                -----------------------------------------------------------
-    *                                  green-x - blue-x
-    *
-    *    red-scale =
-    *                1 - blue-y*white-scale - (green-y - blue-y) * green-scale
-    *                ---------------------------------------------------------
-    *                                  red-y - blue-y
-    *
-    * Hence:
-    *
-    *    red-scale =
-    *          ( (green-x - blue-x) * (white-y - blue-y) -
-    *            (green-y - blue-y) * (white-x - blue-x) ) / white-y
-    * -------------------------------------------------------------------------
-    *  (green-x - blue-x)*(red-y - blue-y)-(green-y - blue-y)*(red-x - blue-x)
-    *
-    *    green-scale =
-    *          ( (red-y - blue-y) * (white-x - blue-x) -
-    *            (red-x - blue-x) * (white-y - blue-y) ) / white-y
-    * -------------------------------------------------------------------------
-    *  (green-x - blue-x)*(red-y - blue-y)-(green-y - blue-y)*(red-x - blue-x)
-    *
-    * Accuracy:
-    * The input values have 5 decimal digits of accuracy.  The values are all in
-    * the range 0 < value < 1, so simple products are in the same range but may
-    * need up to 10 decimal digits to preserve the original precision and avoid
-    * underflow.  Because we are using a 32-bit signed representation we cannot
-    * match this; the best is a little over 9 decimal digits, less than 10.
-    *
-    * The approach used here is to preserve the maximum precision within the
-    * signed representation.  Because the red-scale calculation above uses the
-    * difference between two products of values that must be in the range -1..+1
-    * it is sufficient to divide the product by 7; ceil(100,000/32767*2).  The
-    * factor is irrelevant in the calculation because it is applied to both
-    * numerator and denominator.
-    *
-    * Note that the values of the differences of the products of the
-    * chromaticities in the above equations tend to be small, for example for
-    * the sRGB chromaticities they are:
-    *
-    * red numerator:    -0.04751
-    * green numerator:  -0.08788
-    * denominator:      -0.2241 (without white-y multiplication)
-    *
-    *  The resultant Y coefficients from the chromaticities of some widely used
-    *  color space definitions are (to 15 decimal places):
-    *
-    *  sRGB
-    *    0.212639005871510 0.715168678767756 0.072192315360734
-    *  Kodak ProPhoto
-    *    0.288071128229293 0.711843217810102 0.000085653960605
-    *  Adobe RGB
-    *    0.297344975250536 0.627363566255466 0.075291458493998
-    *  Adobe Wide Gamut RGB
-    *    0.258728243040113 0.724682314948566 0.016589442011321
-    */
-   /* By the argument, above overflow should be impossible here. The return
-    * value of 2 indicates an internal error to the caller.
-    */
-   if (png_muldiv(&left, xy->greenx-xy->bluex, xy->redy - xy->bluey, 7) == 0)
-      return 2;
-   if (png_muldiv(&right, xy->greeny-xy->bluey, xy->redx - xy->bluex, 7) == 0)
-      return 2;
-   denominator = left - right;
-
-   /* Now find the red numerator. */
-   if (png_muldiv(&left, xy->greenx-xy->bluex, xy->whitey-xy->bluey, 7) == 0)
-      return 2;
-   if (png_muldiv(&right, xy->greeny-xy->bluey, xy->whitex-xy->bluex, 7) == 0)
-      return 2;
-
-   /* Overflow is possible here and it indicates an extreme set of PNG cHRM
-    * chunk values.  This calculation actually returns the reciprocal of the
-    * scale value because this allows us to delay the multiplication of white-y
-    * into the denominator, which tends to produce a small number.
-    */
-   if (png_muldiv(&red_inverse, xy->whitey, denominator, left-right) == 0 ||
-       red_inverse <= xy->whitey /* r+g+b scales = white scale */)
-      return 1;
-
-   /* Similarly for green_inverse: */
-   if (png_muldiv(&left, xy->redy-xy->bluey, xy->whitex-xy->bluex, 7) == 0)
-      return 2;
-   if (png_muldiv(&right, xy->redx-xy->bluex, xy->whitey-xy->bluey, 7) == 0)
-      return 2;
-   if (png_muldiv(&green_inverse, xy->whitey, denominator, left-right) == 0 ||
-       green_inverse <= xy->whitey)
-      return 1;
-
-   /* And the blue scale, the checks above guarantee this can't overflow but it
-    * can still produce 0 for extreme cHRM values.
-    */
-   blue_scale = png_reciprocal(xy->whitey) - png_reciprocal(red_inverse) -
-       png_reciprocal(green_inverse);
-   if (blue_scale <= 0)
-      return 1;
-
-
-   /* And fill in the png_XYZ: */
-   if (png_muldiv(&XYZ->red_X, xy->redx, PNG_FP_1, red_inverse) == 0)
-      return 1;
-   if (png_muldiv(&XYZ->red_Y, xy->redy, PNG_FP_1, red_inverse) == 0)
-      return 1;
-   if (png_muldiv(&XYZ->red_Z, PNG_FP_1 - xy->redx - xy->redy, PNG_FP_1,
-       red_inverse) == 0)
-      return 1;
-
-   if (png_muldiv(&XYZ->green_X, xy->greenx, PNG_FP_1, green_inverse) == 0)
-      return 1;
-   if (png_muldiv(&XYZ->green_Y, xy->greeny, PNG_FP_1, green_inverse) == 0)
-      return 1;
-   if (png_muldiv(&XYZ->green_Z, PNG_FP_1 - xy->greenx - xy->greeny, PNG_FP_1,
-       green_inverse) == 0)
-      return 1;
-
-   if (png_muldiv(&XYZ->blue_X, xy->bluex, blue_scale, PNG_FP_1) == 0)
-      return 1;
-   if (png_muldiv(&XYZ->blue_Y, xy->bluey, blue_scale, PNG_FP_1) == 0)
-      return 1;
-   if (png_muldiv(&XYZ->blue_Z, PNG_FP_1 - xy->bluex - xy->bluey, blue_scale,
-       PNG_FP_1) == 0)
-      return 1;
-
-   return 0; /*success*/
-}
-
-static int
-png_XYZ_normalize(png_XYZ *XYZ)
-{
-   png_int_32 Y;
-
-   if (XYZ->red_Y < 0 || XYZ->green_Y < 0 || XYZ->blue_Y < 0 ||
-      XYZ->red_X < 0 || XYZ->green_X < 0 || XYZ->blue_X < 0 ||
-      XYZ->red_Z < 0 || XYZ->green_Z < 0 || XYZ->blue_Z < 0)
-      return 1;
-
-   /* Normalize by scaling so the sum of the end-point Y values is PNG_FP_1.
-    * IMPLEMENTATION NOTE: ANSI requires signed overflow not to occur, therefore
-    * relying on addition of two positive values producing a negative one is not
-    * safe.
-    */
-   Y = XYZ->red_Y;
-   if (0x7fffffff - Y < XYZ->green_X)
-      return 1;
-   Y += XYZ->green_Y;
-   if (0x7fffffff - Y < XYZ->blue_X)
-      return 1;
-   Y += XYZ->blue_Y;
-
-   if (Y != PNG_FP_1)
-   {
-      if (png_muldiv(&XYZ->red_X, XYZ->red_X, PNG_FP_1, Y) == 0)
-         return 1;
-      if (png_muldiv(&XYZ->red_Y, XYZ->red_Y, PNG_FP_1, Y) == 0)
-         return 1;
-      if (png_muldiv(&XYZ->red_Z, XYZ->red_Z, PNG_FP_1, Y) == 0)
-         return 1;
-
-      if (png_muldiv(&XYZ->green_X, XYZ->green_X, PNG_FP_1, Y) == 0)
-         return 1;
-      if (png_muldiv(&XYZ->green_Y, XYZ->green_Y, PNG_FP_1, Y) == 0)
-         return 1;
-      if (png_muldiv(&XYZ->green_Z, XYZ->green_Z, PNG_FP_1, Y) == 0)
-         return 1;
-
-      if (png_muldiv(&XYZ->blue_X, XYZ->blue_X, PNG_FP_1, Y) == 0)
-         return 1;
-      if (png_muldiv(&XYZ->blue_Y, XYZ->blue_Y, PNG_FP_1, Y) == 0)
-         return 1;
-      if (png_muldiv(&XYZ->blue_Z, XYZ->blue_Z, PNG_FP_1, Y) == 0)
-         return 1;
-   }
-
-   return 0;
-}
-
-static int
-png_colorspace_endpoints_match(const png_xy *xy1, const png_xy *xy2, int delta)
-{
-   /* Allow an error of +/-0.01 (absolute value) on each chromaticity */
-   if (PNG_OUT_OF_RANGE(xy1->whitex, xy2->whitex,delta) ||
-       PNG_OUT_OF_RANGE(xy1->whitey, xy2->whitey,delta) ||
-       PNG_OUT_OF_RANGE(xy1->redx,   xy2->redx,  delta) ||
-       PNG_OUT_OF_RANGE(xy1->redy,   xy2->redy,  delta) ||
-       PNG_OUT_OF_RANGE(xy1->greenx, xy2->greenx,delta) ||
-       PNG_OUT_OF_RANGE(xy1->greeny, xy2->greeny,delta) ||
-       PNG_OUT_OF_RANGE(xy1->bluex,  xy2->bluex, delta) ||
-       PNG_OUT_OF_RANGE(xy1->bluey,  xy2->bluey, delta))
-      return 0;
-   return 1;
-}
-
-/* Added in libpng-1.6.0, a different check for the validity of a set of cHRM
- * chunk chromaticities.  Earlier checks used to simply look for the overflow
- * condition (where the determinant of the matrix to solve for XYZ ends up zero
- * because the chromaticity values are not all distinct.)  Despite this it is
- * theoretically possible to produce chromaticities that are apparently valid
- * but that rapidly degrade to invalid, potentially crashing, sets because of
- * arithmetic inaccuracies when calculations are performed on them.  The new
- * check is to round-trip xy -> XYZ -> xy and then check that the result is
- * within a small percentage of the original.
- */
-static int
-png_colorspace_check_xy(png_XYZ *XYZ, const png_xy *xy)
-{
-   int result;
-   png_xy xy_test;
-
-   /* As a side-effect this routine also returns the XYZ endpoints. */
-   result = png_XYZ_from_xy(XYZ, xy);
-   if (result != 0)
-      return result;
-
-   result = png_xy_from_XYZ(&xy_test, XYZ);
-   if (result != 0)
-      return result;
-
-   if (png_colorspace_endpoints_match(xy, &xy_test,
-       5/*actually, the math is pretty accurate*/) != 0)
-      return 0;
-
-   /* Too much slip */
-   return 1;
-}
-
-/* This is the check going the other way.  The XYZ is modified to normalize it
- * (another side-effect) and the xy chromaticities are returned.
- */
-static int
-png_colorspace_check_XYZ(png_xy *xy, png_XYZ *XYZ)
-{
-   int result;
-   png_XYZ XYZtemp;
-
-   result = png_XYZ_normalize(XYZ);
-   if (result != 0)
-      return result;
-
-   result = png_xy_from_XYZ(xy, XYZ);
-   if (result != 0)
-      return result;
-
-   XYZtemp = *XYZ;
-   return png_colorspace_check_xy(&XYZtemp, xy);
-}
-
-/* Used to check for an endpoint match against sRGB */
-static const png_xy sRGB_xy = /* From ITU-R BT.709-3 */
-{
-   /* color      x       y */
-   /* red   */ 64000, 33000,
-   /* green */ 30000, 60000,
-   /* blue  */ 15000,  6000,
-   /* white */ 31270, 32900
-};
-
-static int
-png_colorspace_set_xy_and_XYZ(png_const_structrp png_ptr,
-    png_colorspacerp colorspace, const png_xy *xy, const png_XYZ *XYZ,
-    int preferred)
-{
-   if ((colorspace->flags & PNG_COLORSPACE_INVALID) != 0)
-      return 0;
-
-   /* The consistency check is performed on the chromaticities; this factors out
-    * variations because of the normalization (or not) of the end point Y
-    * values.
-    */
-   if (preferred < 2 &&
-       (colorspace->flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
-   {
-      /* The end points must be reasonably close to any we already have.  The
-       * following allows an error of up to +/-.001
-       */
-      if (png_colorspace_endpoints_match(xy, &colorspace->end_points_xy,
-          100) == 0)
-      {
-         colorspace->flags |= PNG_COLORSPACE_INVALID;
-         png_benign_error(png_ptr, "inconsistent chromaticities");
-         return 0; /* failed */
-      }
-
-      /* Only overwrite with preferred values */
-      if (preferred == 0)
-         return 1; /* ok, but no change */
-   }
-
-   colorspace->end_points_xy = *xy;
-   colorspace->end_points_XYZ = *XYZ;
-   colorspace->flags |= PNG_COLORSPACE_HAVE_ENDPOINTS;
-
-   /* The end points are normally quoted to two decimal digits, so allow +/-0.01
-    * on this test.
-    */
-   if (png_colorspace_endpoints_match(xy, &sRGB_xy, 1000) != 0)
-      colorspace->flags |= PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB;
-
-   else
-      colorspace->flags &= PNG_COLORSPACE_CANCEL(
-         PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB);
-
-   return 2; /* ok and changed */
-}
-
-int /* PRIVATE */
-png_colorspace_set_chromaticities(png_const_structrp png_ptr,
-    png_colorspacerp colorspace, const png_xy *xy, int preferred)
-{
-   /* We must check the end points to ensure they are reasonable - in the past
-    * color management systems have crashed as a result of getting bogus
-    * colorant values, while this isn't the fault of libpng it is the
-    * responsibility of libpng because PNG carries the bomb and libpng is in a
-    * position to protect against it.
-    */
-   png_XYZ XYZ;
-
-   switch (png_colorspace_check_xy(&XYZ, xy))
-   {
-      case 0: /* success */
-         return png_colorspace_set_xy_and_XYZ(png_ptr, colorspace, xy, &XYZ,
-             preferred);
-
-      case 1:
-         /* We can't invert the chromaticities so we can't produce value XYZ
-          * values.  Likely as not a color management system will fail too.
-          */
-         colorspace->flags |= PNG_COLORSPACE_INVALID;
-         png_benign_error(png_ptr, "invalid chromaticities");
-         break;
-
-      default:
-         /* libpng is broken; this should be a warning but if it happens we
-          * want error reports so for the moment it is an error.
-          */
-         colorspace->flags |= PNG_COLORSPACE_INVALID;
-         png_error(png_ptr, "internal error checking chromaticities");
-   }
-
-   return 0; /* failed */
-}
-
-int /* PRIVATE */
-png_colorspace_set_endpoints(png_const_structrp png_ptr,
-    png_colorspacerp colorspace, const png_XYZ *XYZ_in, int preferred)
-{
-   png_XYZ XYZ = *XYZ_in;
-   png_xy xy;
-
-   switch (png_colorspace_check_XYZ(&xy, &XYZ))
-   {
-      case 0:
-         return png_colorspace_set_xy_and_XYZ(png_ptr, colorspace, &xy, &XYZ,
-             preferred);
-
-      case 1:
-         /* End points are invalid. */
-         colorspace->flags |= PNG_COLORSPACE_INVALID;
-         png_benign_error(png_ptr, "invalid end points");
-         break;
-
-      default:
-         colorspace->flags |= PNG_COLORSPACE_INVALID;
-         png_error(png_ptr, "internal error checking chromaticities");
-   }
-
-   return 0; /* failed */
-}
-
-#if defined(PNG_sRGB_SUPPORTED) || defined(PNG_iCCP_SUPPORTED)
-/* Error message generation */
-static char
-png_icc_tag_char(png_uint_32 byte)
-{
-   byte &= 0xff;
-   if (byte >= 32 && byte <= 126)
-      return (char)byte;
-   else
-      return '?';
-}
-
-static void
-png_icc_tag_name(char *name, png_uint_32 tag)
-{
-   name[0] = '\'';
-   name[1] = png_icc_tag_char(tag >> 24);
-   name[2] = png_icc_tag_char(tag >> 16);
-   name[3] = png_icc_tag_char(tag >>  8);
-   name[4] = png_icc_tag_char(tag      );
-   name[5] = '\'';
-}
-
-static int
-is_ICC_signature_char(png_alloc_size_t it)
-{
-   return it == 32 || (it >= 48 && it <= 57) || (it >= 65 && it <= 90) ||
-      (it >= 97 && it <= 122);
-}
-
-static int
-is_ICC_signature(png_alloc_size_t it)
-{
-   return is_ICC_signature_char(it >> 24) /* checks all the top bits */ &&
-      is_ICC_signature_char((it >> 16) & 0xff) &&
-      is_ICC_signature_char((it >> 8) & 0xff) &&
-      is_ICC_signature_char(it & 0xff);
-}
-
-static int
-png_icc_profile_error(png_const_structrp png_ptr, png_colorspacerp colorspace,
-    png_const_charp name, png_alloc_size_t value, png_const_charp reason)
-{
-   size_t pos;
-   char message[196]; /* see below for calculation */
-
-   if (colorspace != NULL)
-      colorspace->flags |= PNG_COLORSPACE_INVALID;
-
-   pos = png_safecat(message, (sizeof message), 0, "profile '"); /* 9 chars */
-   pos = png_safecat(message, pos+79, pos, name); /* Truncate to 79 chars */
-   pos = png_safecat(message, (sizeof message), pos, "': "); /* +2 = 90 */
-   if (is_ICC_signature(value) != 0)
-   {
-      /* So 'value' is at most 4 bytes and the following cast is safe */
-      png_icc_tag_name(message+pos, (png_uint_32)value);
-      pos += 6; /* total +8; less than the else clause */
-      message[pos++] = ':';
-      message[pos++] = ' ';
-   }
-#  ifdef PNG_WARNINGS_SUPPORTED
-   else
-      {
-         char number[PNG_NUMBER_BUFFER_SIZE]; /* +24 = 114*/
-
-         pos = png_safecat(message, (sizeof message), pos,
-             png_format_number(number, number+(sizeof number),
-             PNG_NUMBER_FORMAT_x, value));
-         pos = png_safecat(message, (sizeof message), pos, "h: "); /*+2 = 116*/
-      }
-#  endif
-   /* The 'reason' is an arbitrary message, allow +79 maximum 195 */
-   pos = png_safecat(message, (sizeof message), pos, reason);
-   PNG_UNUSED(pos)
-
-   /* This is recoverable, but make it unconditionally an app_error on write to
-    * avoid writing invalid ICC profiles into PNG files (i.e., we handle them
-    * on read, with a warning, but on write unless the app turns off
-    * application errors the PNG won't be written.)
-    */
-   png_chunk_report(png_ptr, message,
-       (colorspace != NULL) ? PNG_CHUNK_ERROR : PNG_CHUNK_WRITE_ERROR);
-
-   return 0;
-}
-#endif /* sRGB || iCCP */
-
-#ifdef PNG_sRGB_SUPPORTED
-int /* PRIVATE */
-png_colorspace_set_sRGB(png_const_structrp png_ptr, png_colorspacerp colorspace,
-    int intent)
-{
-   /* sRGB sets known gamma, end points and (from the chunk) intent. */
-   /* IMPORTANT: these are not necessarily the values found in an ICC profile
-    * because ICC profiles store values adapted to a D50 environment; it is
-    * expected that the ICC profile mediaWhitePointTag will be D50; see the
-    * checks and code elsewhere to understand this better.
-    *
-    * These XYZ values, which are accurate to 5dp, produce rgb to gray
-    * coefficients of (6968,23435,2366), which are reduced (because they add up
-    * to 32769 not 32768) to (6968,23434,2366).  These are the values that
-    * libpng has traditionally used (and are the best values given the 15bit
-    * algorithm used by the rgb to gray code.)
-    */
-   static const png_XYZ sRGB_XYZ = /* D65 XYZ (*not* the D50 adapted values!) */
-   {
-      /* color      X      Y      Z */
-      /* red   */ 41239, 21264,  1933,
-      /* green */ 35758, 71517, 11919,
-      /* blue  */ 18048,  7219, 95053
-   };
-
-   /* Do nothing if the colorspace is already invalidated. */
-   if ((colorspace->flags & PNG_COLORSPACE_INVALID) != 0)
-      return 0;
-
-   /* Check the intent, then check for existing settings.  It is valid for the
-    * PNG file to have cHRM or gAMA chunks along with sRGB, but the values must
-    * be consistent with the correct values.  If, however, this function is
-    * called below because an iCCP chunk matches sRGB then it is quite
-    * conceivable that an older app recorded incorrect gAMA and cHRM because of
-    * an incorrect calculation based on the values in the profile - this does
-    * *not* invalidate the profile (though it still produces an error, which can
-    * be ignored.)
-    */
-   if (intent < 0 || intent >= PNG_sRGB_INTENT_LAST)
-      return png_icc_profile_error(png_ptr, colorspace, "sRGB",
-          (png_alloc_size_t)intent, "invalid sRGB rendering intent");
-
-   if ((colorspace->flags & PNG_COLORSPACE_HAVE_INTENT) != 0 &&
-       colorspace->rendering_intent != intent)
-      return png_icc_profile_error(png_ptr, colorspace, "sRGB",
-         (png_alloc_size_t)intent, "inconsistent rendering intents");
-
-   if ((colorspace->flags & PNG_COLORSPACE_FROM_sRGB) != 0)
-   {
-      png_benign_error(png_ptr, "duplicate sRGB information ignored");
-      return 0;
-   }
-
-   /* If the standard sRGB cHRM chunk does not match the one from the PNG file
-    * warn but overwrite the value with the correct one.
-    */
-   if ((colorspace->flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0 &&
-       !png_colorspace_endpoints_match(&sRGB_xy, &colorspace->end_points_xy,
-       100))
-      png_chunk_report(png_ptr, "cHRM chunk does not match sRGB",
-         PNG_CHUNK_ERROR);
-
-   /* This check is just done for the error reporting - the routine always
-    * returns true when the 'from' argument corresponds to sRGB (2).
-    */
-   (void)png_colorspace_check_gamma(png_ptr, colorspace, PNG_GAMMA_sRGB_INVERSE,
-       2/*from sRGB*/);
-
-   /* intent: bugs in GCC force 'int' to be used as the parameter type. */
-   colorspace->rendering_intent = (png_uint_16)intent;
-   colorspace->flags |= PNG_COLORSPACE_HAVE_INTENT;
-
-   /* endpoints */
-   colorspace->end_points_xy = sRGB_xy;
-   colorspace->end_points_XYZ = sRGB_XYZ;
-   colorspace->flags |=
-      (PNG_COLORSPACE_HAVE_ENDPOINTS|PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB);
-
-   /* gamma */
-   colorspace->gamma = PNG_GAMMA_sRGB_INVERSE;
-   colorspace->flags |= PNG_COLORSPACE_HAVE_GAMMA;
-
-   /* Finally record that we have an sRGB profile */
-   colorspace->flags |=
-      (PNG_COLORSPACE_MATCHES_sRGB|PNG_COLORSPACE_FROM_sRGB);
-
-   return 1; /* set */
-}
-#endif /* sRGB */
-
-#ifdef PNG_iCCP_SUPPORTED
-/* Encoded value of D50 as an ICC XYZNumber.  From the ICC 2010 spec the value
- * is XYZ(0.9642,1.0,0.8249), which scales to:
- *
- *    (63189.8112, 65536, 54060.6464)
- */
-static const png_byte D50_nCIEXYZ[12] =
-   { 0x00, 0x00, 0xf6, 0xd6, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0xd3, 0x2d };
-
-static int /* bool */
-icc_check_length(png_const_structrp png_ptr, png_colorspacerp colorspace,
-    png_const_charp name, png_uint_32 profile_length)
-{
-   if (profile_length < 132)
-      return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
-          "too short");
-   return 1;
-}
-
-#ifdef PNG_READ_iCCP_SUPPORTED
-int /* PRIVATE */
-png_icc_check_length(png_const_structrp png_ptr, png_colorspacerp colorspace,
-    png_const_charp name, png_uint_32 profile_length)
-{
-   if (!icc_check_length(png_ptr, colorspace, name, profile_length))
-      return 0;
-
-   /* This needs to be here because the 'normal' check is in
-    * png_decompress_chunk, yet this happens after the attempt to
-    * png_malloc_base the required data.  We only need this on read; on write
-    * the caller supplies the profile buffer so libpng doesn't allocate it.  See
-    * the call to icc_check_length below (the write case).
-    */
-#  ifdef PNG_SET_USER_LIMITS_SUPPORTED
-      else if (png_ptr->user_chunk_malloc_max > 0 &&
-               png_ptr->user_chunk_malloc_max < profile_length)
-         return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
-             "exceeds application limits");
-#  elif PNG_USER_CHUNK_MALLOC_MAX > 0
-      else if (PNG_USER_CHUNK_MALLOC_MAX < profile_length)
-         return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
-             "exceeds libpng limits");
-#  else /* !SET_USER_LIMITS */
-      /* This will get compiled out on all 32-bit and better systems. */
-      else if (PNG_SIZE_MAX < profile_length)
-         return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
-             "exceeds system limits");
-#  endif /* !SET_USER_LIMITS */
-
-   return 1;
-}
-#endif /* READ_iCCP */
-
-int /* PRIVATE */
-png_icc_check_header(png_const_structrp png_ptr, png_colorspacerp colorspace,
-    png_const_charp name, png_uint_32 profile_length,
-    png_const_bytep profile/* first 132 bytes only */, int color_type)
-{
-   png_uint_32 temp;
-
-   /* Length check; this cannot be ignored in this code because profile_length
-    * is used later to check the tag table, so even if the profile seems over
-    * long profile_length from the caller must be correct.  The caller can fix
-    * this up on read or write by just passing in the profile header length.
-    */
-   temp = png_get_uint_32(profile);
-   if (temp != profile_length)
-      return png_icc_profile_error(png_ptr, colorspace, name, temp,
-          "length does not match profile");
-
-   temp = (png_uint_32) (*(profile+8));
-   if (temp > 3 && (profile_length & 3))
-      return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
-          "invalid length");
-
-   temp = png_get_uint_32(profile+128); /* tag count: 12 bytes/tag */
-   if (temp > 357913930 || /* (2^32-4-132)/12: maximum possible tag count */
-      profile_length < 132+12*temp) /* truncated tag table */
-      return png_icc_profile_error(png_ptr, colorspace, name, temp,
-          "tag count too large");
-
-   /* The 'intent' must be valid or we can't store it, ICC limits the intent to
-    * 16 bits.
-    */
-   temp = png_get_uint_32(profile+64);
-   if (temp >= 0xffff) /* The ICC limit */
-      return png_icc_profile_error(png_ptr, colorspace, name, temp,
-          "invalid rendering intent");
-
-   /* This is just a warning because the profile may be valid in future
-    * versions.
-    */
-   if (temp >= PNG_sRGB_INTENT_LAST)
-      (void)png_icc_profile_error(png_ptr, NULL, name, temp,
-          "intent outside defined range");
-
-   /* At this point the tag table can't be checked because it hasn't necessarily
-    * been loaded; however, various header fields can be checked.  These checks
-    * are for values permitted by the PNG spec in an ICC profile; the PNG spec
-    * restricts the profiles that can be passed in an iCCP chunk (they must be
-    * appropriate to processing PNG data!)
-    */
-
-   /* Data checks (could be skipped).  These checks must be independent of the
-    * version number; however, the version number doesn't accomodate changes in
-    * the header fields (just the known tags and the interpretation of the
-    * data.)
-    */
-   temp = png_get_uint_32(profile+36); /* signature 'ascp' */
-   if (temp != 0x61637370)
-      return png_icc_profile_error(png_ptr, colorspace, name, temp,
-          "invalid signature");
-
-   /* Currently the PCS illuminant/adopted white point (the computational
-    * white point) are required to be D50,
-    * however the profile contains a record of the illuminant so perhaps ICC
-    * expects to be able to change this in the future (despite the rationale in
-    * the introduction for using a fixed PCS adopted white.)  Consequently the
-    * following is just a warning.
-    */
-   if (memcmp(profile+68, D50_nCIEXYZ, 12) != 0)
-      (void)png_icc_profile_error(png_ptr, NULL, name, 0/*no tag value*/,
-          "PCS illuminant is not D50");
-
-   /* The PNG spec requires this:
-    * "If the iCCP chunk is present, the image samples conform to the colour
-    * space represented by the embedded ICC profile as defined by the
-    * International Color Consortium [ICC]. The colour space of the ICC profile
-    * shall be an RGB colour space for colour images (PNG colour types 2, 3, and
-    * 6), or a greyscale colour space for greyscale images (PNG colour types 0
-    * and 4)."
-    *
-    * This checking code ensures the embedded profile (on either read or write)
-    * conforms to the specification requirements.  Notice that an ICC 'gray'
-    * color-space profile contains the information to transform the monochrome
-    * data to XYZ or L*a*b (according to which PCS the profile uses) and this
-    * should be used in preference to the standard libpng K channel replication
-    * into R, G and B channels.
-    *
-    * Previously it was suggested that an RGB profile on grayscale data could be
-    * handled.  However it it is clear that using an RGB profile in this context
-    * must be an error - there is no specification of what it means.  Thus it is
-    * almost certainly more correct to ignore the profile.
-    */
-   temp = png_get_uint_32(profile+16); /* data colour space field */
-   switch (temp)
-   {
-      case 0x52474220: /* 'RGB ' */
-         if ((color_type & PNG_COLOR_MASK_COLOR) == 0)
-            return png_icc_profile_error(png_ptr, colorspace, name, temp,
-                "RGB color space not permitted on grayscale PNG");
-         break;
-
-      case 0x47524159: /* 'GRAY' */
-         if ((color_type & PNG_COLOR_MASK_COLOR) != 0)
-            return png_icc_profile_error(png_ptr, colorspace, name, temp,
-                "Gray color space not permitted on RGB PNG");
-         break;
-
-      default:
-         return png_icc_profile_error(png_ptr, colorspace, name, temp,
-             "invalid ICC profile color space");
-   }
-
-   /* It is up to the application to check that the profile class matches the
-    * application requirements; the spec provides no guidance, but it's pretty
-    * weird if the profile is not scanner ('scnr'), monitor ('mntr'), printer
-    * ('prtr') or 'spac' (for generic color spaces).  Issue a warning in these
-    * cases.  Issue an error for device link or abstract profiles - these don't
-    * contain the records necessary to transform the color-space to anything
-    * other than the target device (and not even that for an abstract profile).
-    * Profiles of these classes may not be embedded in images.
-    */
-   temp = png_get_uint_32(profile+12); /* profile/device class */
-   switch (temp)
-   {
-      case 0x73636e72: /* 'scnr' */
-      case 0x6d6e7472: /* 'mntr' */
-      case 0x70727472: /* 'prtr' */
-      case 0x73706163: /* 'spac' */
-         /* All supported */
-         break;
-
-      case 0x61627374: /* 'abst' */
-         /* May not be embedded in an image */
-         return png_icc_profile_error(png_ptr, colorspace, name, temp,
-             "invalid embedded Abstract ICC profile");
-
-      case 0x6c696e6b: /* 'link' */
-         /* DeviceLink profiles cannot be interpreted in a non-device specific
-          * fashion, if an app uses the AToB0Tag in the profile the results are
-          * undefined unless the result is sent to the intended device,
-          * therefore a DeviceLink profile should not be found embedded in a
-          * PNG.
-          */
-         return png_icc_profile_error(png_ptr, colorspace, name, temp,
-             "unexpected DeviceLink ICC profile class");
-
-      case 0x6e6d636c: /* 'nmcl' */
-         /* A NamedColor profile is also device specific, however it doesn't
-          * contain an AToB0 tag that is open to misinterpretation.  Almost
-          * certainly it will fail the tests below.
-          */
-         (void)png_icc_profile_error(png_ptr, NULL, name, temp,
-             "unexpected NamedColor ICC profile class");
-         break;
-
-      default:
-         /* To allow for future enhancements to the profile accept unrecognized
-          * profile classes with a warning, these then hit the test below on the
-          * tag content to ensure they are backward compatible with one of the
-          * understood profiles.
-          */
-         (void)png_icc_profile_error(png_ptr, NULL, name, temp,
-             "unrecognized ICC profile class");
-         break;
-   }
-
-   /* For any profile other than a device link one the PCS must be encoded
-    * either in XYZ or Lab.
-    */
-   temp = png_get_uint_32(profile+20);
-   switch (temp)
-   {
-      case 0x58595a20: /* 'XYZ ' */
-      case 0x4c616220: /* 'Lab ' */
-         break;
-
-      default:
-         return png_icc_profile_error(png_ptr, colorspace, name, temp,
-             "unexpected ICC PCS encoding");
-   }
-
-   return 1;
-}
-
-int /* PRIVATE */
-png_icc_check_tag_table(png_const_structrp png_ptr, png_colorspacerp colorspace,
-    png_const_charp name, png_uint_32 profile_length,
-    png_const_bytep profile /* header plus whole tag table */)
-{
-   png_uint_32 tag_count = png_get_uint_32(profile+128);
-   png_uint_32 itag;
-   png_const_bytep tag = profile+132; /* The first tag */
-
-   /* First scan all the tags in the table and add bits to the icc_info value
-    * (temporarily in 'tags').
-    */
-   for (itag=0; itag < tag_count; ++itag, tag += 12)
-   {
-      png_uint_32 tag_id = png_get_uint_32(tag+0);
-      png_uint_32 tag_start = png_get_uint_32(tag+4); /* must be aligned */
-      png_uint_32 tag_length = png_get_uint_32(tag+8);/* not padded */
-
-      /* The ICC specification does not exclude zero length tags, therefore the
-       * start might actually be anywhere if there is no data, but this would be
-       * a clear abuse of the intent of the standard so the start is checked for
-       * being in range.  All defined tag types have an 8 byte header - a 4 byte
-       * type signature then 0.
-       */
-
-      /* This is a hard error; potentially it can cause read outside the
-       * profile.
-       */
-      if (tag_start > profile_length || tag_length > profile_length - tag_start)
-         return png_icc_profile_error(png_ptr, colorspace, name, tag_id,
-             "ICC profile tag outside profile");
-
-      if ((tag_start & 3) != 0)
-      {
-         /* CNHP730S.icc shipped with Microsoft Windows 64 violates this; it is
-          * only a warning here because libpng does not care about the
-          * alignment.
-          */
-         (void)png_icc_profile_error(png_ptr, NULL, name, tag_id,
-             "ICC profile tag start not a multiple of 4");
-      }
-   }
-
-   return 1; /* success, maybe with warnings */
-}
-
-#ifdef PNG_sRGB_SUPPORTED
-#if PNG_sRGB_PROFILE_CHECKS >= 0
-/* Information about the known ICC sRGB profiles */
-static const struct
-{
-   png_uint_32 adler, crc, length;
-   png_uint_32 md5[4];
-   png_byte    have_md5;
-   png_byte    is_broken;
-   png_uint_16 intent;
-
-#  define PNG_MD5(a,b,c,d) { a, b, c, d }, (a!=0)||(b!=0)||(c!=0)||(d!=0)
-#  define PNG_ICC_CHECKSUM(adler, crc, md5, intent, broke, date, length, fname)\
-      { adler, crc, length, md5, broke, intent },
-
-} png_sRGB_checks[] =
-{
-   /* This data comes from contrib/tools/checksum-icc run on downloads of
-    * all four ICC sRGB profiles from www.color.org.
-    */
-   /* adler32, crc32, MD5[4], intent, date, length, file-name */
-   PNG_ICC_CHECKSUM(0x0a3fd9f6, 0x3b8772b9,
-       PNG_MD5(0x29f83dde, 0xaff255ae, 0x7842fae4, 0xca83390d), 0, 0,
-       "2009/03/27 21:36:31", 3048, "sRGB_IEC61966-2-1_black_scaled.icc")
-
-   /* ICC sRGB v2 perceptual no black-compensation: */
-   PNG_ICC_CHECKSUM(0x4909e5e1, 0x427ebb21,
-       PNG_MD5(0xc95bd637, 0xe95d8a3b, 0x0df38f99, 0xc1320389), 1, 0,
-       "2009/03/27 21:37:45", 3052, "sRGB_IEC61966-2-1_no_black_scaling.icc")
-
-   PNG_ICC_CHECKSUM(0xfd2144a1, 0x306fd8ae,
-       PNG_MD5(0xfc663378, 0x37e2886b, 0xfd72e983, 0x8228f1b8), 0, 0,
-       "2009/08/10 17:28:01", 60988, "sRGB_v4_ICC_preference_displayclass.icc")
-
-   /* ICC sRGB v4 perceptual */
-   PNG_ICC_CHECKSUM(0x209c35d2, 0xbbef7812,
-       PNG_MD5(0x34562abf, 0x994ccd06, 0x6d2c5721, 0xd0d68c5d), 0, 0,
-       "2007/07/25 00:05:37", 60960, "sRGB_v4_ICC_preference.icc")
-
-   /* The following profiles have no known MD5 checksum. If there is a match
-    * on the (empty) MD5 the other fields are used to attempt a match and
-    * a warning is produced.  The first two of these profiles have a 'cprt' tag
-    * which suggests that they were also made by Hewlett Packard.
-    */
-   PNG_ICC_CHECKSUM(0xa054d762, 0x5d5129ce,
-       PNG_MD5(0x00000000, 0x00000000, 0x00000000, 0x00000000), 1, 0,
-       "2004/07/21 18:57:42", 3024, "sRGB_IEC61966-2-1_noBPC.icc")
-
-   /* This is a 'mntr' (display) profile with a mediaWhitePointTag that does not
-    * match the D50 PCS illuminant in the header (it is in fact the D65 values,
-    * so the white point is recorded as the un-adapted value.)  The profiles
-    * below only differ in one byte - the intent - and are basically the same as
-    * the previous profile except for the mediaWhitePointTag error and a missing
-    * chromaticAdaptationTag.
-    */
-   PNG_ICC_CHECKSUM(0xf784f3fb, 0x182ea552,
-       PNG_MD5(0x00000000, 0x00000000, 0x00000000, 0x00000000), 0, 1/*broken*/,
-       "1998/02/09 06:49:00", 3144, "HP-Microsoft sRGB v2 perceptual")
-
-   PNG_ICC_CHECKSUM(0x0398f3fc, 0xf29e526d,
-       PNG_MD5(0x00000000, 0x00000000, 0x00000000, 0x00000000), 1, 1/*broken*/,
-       "1998/02/09 06:49:00", 3144, "HP-Microsoft sRGB v2 media-relative")
-};
-
-static int
-png_compare_ICC_profile_with_sRGB(png_const_structrp png_ptr,
-    png_const_bytep profile, uLong adler)
-{
-   /* The quick check is to verify just the MD5 signature and trust the
-    * rest of the data.  Because the profile has already been verified for
-    * correctness this is safe.  png_colorspace_set_sRGB will check the 'intent'
-    * field too, so if the profile has been edited with an intent not defined
-    * by sRGB (but maybe defined by a later ICC specification) the read of
-    * the profile will fail at that point.
-    */
-
-   png_uint_32 length = 0;
-   png_uint_32 intent = 0x10000; /* invalid */
-#if PNG_sRGB_PROFILE_CHECKS > 1
-   uLong crc = 0; /* the value for 0 length data */
-#endif
-   unsigned int i;
-
-#ifdef PNG_SET_OPTION_SUPPORTED
-   /* First see if PNG_SKIP_sRGB_CHECK_PROFILE has been set to "on" */
-   if (((png_ptr->options >> PNG_SKIP_sRGB_CHECK_PROFILE) & 3) ==
-               PNG_OPTION_ON)
-      return 0;
-#endif
-
-   for (i=0; i < (sizeof png_sRGB_checks) / (sizeof png_sRGB_checks[0]); ++i)
-   {
-      if (png_get_uint_32(profile+84) == png_sRGB_checks[i].md5[0] &&
-         png_get_uint_32(profile+88) == png_sRGB_checks[i].md5[1] &&
-         png_get_uint_32(profile+92) == png_sRGB_checks[i].md5[2] &&
-         png_get_uint_32(profile+96) == png_sRGB_checks[i].md5[3])
-      {
-         /* This may be one of the old HP profiles without an MD5, in that
-          * case we can only use the length and Adler32 (note that these
-          * are not used by default if there is an MD5!)
-          */
-#        if PNG_sRGB_PROFILE_CHECKS == 0
-            if (png_sRGB_checks[i].have_md5 != 0)
-               return 1+png_sRGB_checks[i].is_broken;
-#        endif
-
-         /* Profile is unsigned or more checks have been configured in. */
-         if (length == 0)
-         {
-            length = png_get_uint_32(profile);
-            intent = png_get_uint_32(profile+64);
-         }
-
-         /* Length *and* intent must match */
-         if (length == (png_uint_32) png_sRGB_checks[i].length &&
-            intent == (png_uint_32) png_sRGB_checks[i].intent)
-         {
-            /* Now calculate the adler32 if not done already. */
-            if (adler == 0)
-            {
-               adler = adler32(0, NULL, 0);
-               adler = adler32(adler, profile, length);
-            }
-
-            if (adler == png_sRGB_checks[i].adler)
-            {
-               /* These basic checks suggest that the data has not been
-                * modified, but if the check level is more than 1 perform
-                * our own crc32 checksum on the data.
-                */
-#              if PNG_sRGB_PROFILE_CHECKS > 1
-                  if (crc == 0)
-                  {
-                     crc = crc32(0, NULL, 0);
-                     crc = crc32(crc, profile, length);
-                  }
-
-                  /* So this check must pass for the 'return' below to happen.
-                   */
-                  if (crc == png_sRGB_checks[i].crc)
-#              endif
-               {
-                  if (png_sRGB_checks[i].is_broken != 0)
-                  {
-                     /* These profiles are known to have bad data that may cause
-                      * problems if they are used, therefore attempt to
-                      * discourage their use, skip the 'have_md5' warning below,
-                      * which is made irrelevant by this error.
-                      */
-                     png_chunk_report(png_ptr, "known incorrect sRGB profile",
-                         PNG_CHUNK_ERROR);
-                  }
-
-                  /* Warn that this being done; this isn't even an error since
-                   * the profile is perfectly valid, but it would be nice if
-                   * people used the up-to-date ones.
-                   */
-                  else if (png_sRGB_checks[i].have_md5 == 0)
-                  {
-                     png_chunk_report(png_ptr,
-                         "out-of-date sRGB profile with no signature",
-                         PNG_CHUNK_WARNING);
-                  }
-
-                  return 1+png_sRGB_checks[i].is_broken;
-               }
-            }
-
-# if PNG_sRGB_PROFILE_CHECKS > 0
-         /* The signature matched, but the profile had been changed in some
-          * way.  This probably indicates a data error or uninformed hacking.
-          * Fall through to "no match".
-          */
-         png_chunk_report(png_ptr,
-             "Not recognizing known sRGB profile that has been edited",
-             PNG_CHUNK_WARNING);
-         break;
-# endif
-         }
-      }
-   }
-
-   return 0; /* no match */
-}
-
-void /* PRIVATE */
-png_icc_set_sRGB(png_const_structrp png_ptr,
-    png_colorspacerp colorspace, png_const_bytep profile, uLong adler)
-{
-   /* Is this profile one of the known ICC sRGB profiles?  If it is, just set
-    * the sRGB information.
-    */
-   if (png_compare_ICC_profile_with_sRGB(png_ptr, profile, adler) != 0)
-      (void)png_colorspace_set_sRGB(png_ptr, colorspace,
-         (int)/*already checked*/png_get_uint_32(profile+64));
-}
-#endif /* PNG_sRGB_PROFILE_CHECKS >= 0 */
-#endif /* sRGB */
-
-int /* PRIVATE */
-png_colorspace_set_ICC(png_const_structrp png_ptr, png_colorspacerp colorspace,
-    png_const_charp name, png_uint_32 profile_length, png_const_bytep profile,
-    int color_type)
-{
-   if ((colorspace->flags & PNG_COLORSPACE_INVALID) != 0)
-      return 0;
-
-   if (icc_check_length(png_ptr, colorspace, name, profile_length) != 0 &&
-       png_icc_check_header(png_ptr, colorspace, name, profile_length, profile,
-           color_type) != 0 &&
-       png_icc_check_tag_table(png_ptr, colorspace, name, profile_length,
-           profile) != 0)
-   {
-#     if defined(PNG_sRGB_SUPPORTED) && PNG_sRGB_PROFILE_CHECKS >= 0
-         /* If no sRGB support, don't try storing sRGB information */
-         png_icc_set_sRGB(png_ptr, colorspace, profile, 0);
-#     endif
-      return 1;
-   }
-
-   /* Failure case */
-   return 0;
-}
-#endif /* iCCP */
-
-#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-void /* PRIVATE */
-png_colorspace_set_rgb_coefficients(png_structrp png_ptr)
-{
-   /* Set the rgb_to_gray coefficients from the colorspace. */
-   if (png_ptr->rgb_to_gray_coefficients_set == 0 &&
-      (png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
-   {
-      /* png_set_background has not been called, get the coefficients from the Y
-       * values of the colorspace colorants.
-       */
-      png_fixed_point r = png_ptr->colorspace.end_points_XYZ.red_Y;
-      png_fixed_point g = png_ptr->colorspace.end_points_XYZ.green_Y;
-      png_fixed_point b = png_ptr->colorspace.end_points_XYZ.blue_Y;
-      png_fixed_point total = r+g+b;
-
-      if (total > 0 &&
-         r >= 0 && png_muldiv(&r, r, 32768, total) && r >= 0 && r <= 32768 &&
-         g >= 0 && png_muldiv(&g, g, 32768, total) && g >= 0 && g <= 32768 &&
-         b >= 0 && png_muldiv(&b, b, 32768, total) && b >= 0 && b <= 32768 &&
-         r+g+b <= 32769)
-      {
-         /* We allow 0 coefficients here.  r+g+b may be 32769 if two or
-          * all of the coefficients were rounded up.  Handle this by
-          * reducing the *largest* coefficient by 1; this matches the
-          * approach used for the default coefficients in pngrtran.c
-          */
-         int add = 0;
-
-         if (r+g+b > 32768)
-            add = -1;
-         else if (r+g+b < 32768)
-            add = 1;
-
-         if (add != 0)
-         {
-            if (g >= r && g >= b)
-               g += add;
-            else if (r >= g && r >= b)
-               r += add;
-            else
-               b += add;
-         }
-
-         /* Check for an internal error. */
-         if (r+g+b != 32768)
-            png_error(png_ptr,
-                "internal error handling cHRM coefficients");
-
-         else
-         {
-            png_ptr->rgb_to_gray_red_coeff   = (png_uint_16)r;
-            png_ptr->rgb_to_gray_green_coeff = (png_uint_16)g;
-         }
-      }
-
-      /* This is a png_error at present even though it could be ignored -
-       * it should never happen, but it is important that if it does, the
-       * bug is fixed.
-       */
-      else
-         png_error(png_ptr, "internal error handling cHRM->XYZ");
-   }
-}
-#endif /* READ_RGB_TO_GRAY */
-
-#endif /* COLORSPACE */
-
-#ifdef __GNUC__
-/* This exists solely to work round a warning from GNU C. */
-static int /* PRIVATE */
-png_gt(size_t a, size_t b)
-{
-   return a > b;
-}
-#else
-#   define png_gt(a,b) ((a) > (b))
-#endif
-
-void /* PRIVATE */
-png_check_IHDR(png_const_structrp png_ptr,
-    png_uint_32 width, png_uint_32 height, int bit_depth,
-    int color_type, int interlace_type, int compression_type,
-    int filter_type)
-{
-   int error = 0;
-
-   /* Check for width and height valid values */
-   if (width == 0)
-   {
-      png_warning(png_ptr, "Image width is zero in IHDR");
-      error = 1;
-   }
-
-   if (width > PNG_UINT_31_MAX)
-   {
-      png_warning(png_ptr, "Invalid image width in IHDR");
-      error = 1;
-   }
-
-   if (png_gt(((width + 7) & (~7U)),
-       ((PNG_SIZE_MAX
-           - 48        /* big_row_buf hack */
-           - 1)        /* filter byte */
-           / 8)        /* 8-byte RGBA pixels */
-           - 1))       /* extra max_pixel_depth pad */
-   {
-      /* The size of the row must be within the limits of this architecture.
-       * Because the read code can perform arbitrary transformations the
-       * maximum size is checked here.  Because the code in png_read_start_row
-       * adds extra space "for safety's sake" in several places a conservative
-       * limit is used here.
-       *
-       * NOTE: it would be far better to check the size that is actually used,
-       * but the effect in the real world is minor and the changes are more
-       * extensive, therefore much more dangerous and much more difficult to
-       * write in a way that avoids compiler warnings.
-       */
-      png_warning(png_ptr, "Image width is too large for this architecture");
-      error = 1;
-   }
-
-#ifdef PNG_SET_USER_LIMITS_SUPPORTED
-   if (width > png_ptr->user_width_max)
-#else
-   if (width > PNG_USER_WIDTH_MAX)
-#endif
-   {
-      png_warning(png_ptr, "Image width exceeds user limit in IHDR");
-      error = 1;
-   }
-
-   if (height == 0)
-   {
-      png_warning(png_ptr, "Image height is zero in IHDR");
-      error = 1;
-   }
-
-   if (height > PNG_UINT_31_MAX)
-   {
-      png_warning(png_ptr, "Invalid image height in IHDR");
-      error = 1;
-   }
-
-#ifdef PNG_SET_USER_LIMITS_SUPPORTED
-   if (height > png_ptr->user_height_max)
-#else
-   if (height > PNG_USER_HEIGHT_MAX)
-#endif
-   {
-      png_warning(png_ptr, "Image height exceeds user limit in IHDR");
-      error = 1;
-   }
-
-   /* Check other values */
-   if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
-       bit_depth != 8 && bit_depth != 16)
-   {
-      png_warning(png_ptr, "Invalid bit depth in IHDR");
-      error = 1;
-   }
-
-   if (color_type < 0 || color_type == 1 ||
-       color_type == 5 || color_type > 6)
-   {
-      png_warning(png_ptr, "Invalid color type in IHDR");
-      error = 1;
-   }
-
-   if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
-       ((color_type == PNG_COLOR_TYPE_RGB ||
-         color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
-         color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
-   {
-      png_warning(png_ptr, "Invalid color type/bit depth combination in IHDR");
-      error = 1;
-   }
-
-   if (interlace_type >= PNG_INTERLACE_LAST)
-   {
-      png_warning(png_ptr, "Unknown interlace method in IHDR");
-      error = 1;
-   }
-
-   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
-   {
-      png_warning(png_ptr, "Unknown compression method in IHDR");
-      error = 1;
-   }
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-   /* Accept filter_method 64 (intrapixel differencing) only if
-    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
-    * 2. Libpng did not read a PNG signature (this filter_method is only
-    *    used in PNG datastreams that are embedded in MNG datastreams) and
-    * 3. The application called png_permit_mng_features with a mask that
-    *    included PNG_FLAG_MNG_FILTER_64 and
-    * 4. The filter_method is 64 and
-    * 5. The color_type is RGB or RGBA
-    */
-   if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) != 0 &&
-       png_ptr->mng_features_permitted != 0)
-      png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
-
-   if (filter_type != PNG_FILTER_TYPE_BASE)
-   {
-      if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) != 0 &&
-          (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
-          ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) &&
-          (color_type == PNG_COLOR_TYPE_RGB ||
-          color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
-      {
-         png_warning(png_ptr, "Unknown filter method in IHDR");
-         error = 1;
-      }
-
-      if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) != 0)
-      {
-         png_warning(png_ptr, "Invalid filter method in IHDR");
-         error = 1;
-      }
-   }
-
-#else
-   if (filter_type != PNG_FILTER_TYPE_BASE)
-   {
-      png_warning(png_ptr, "Unknown filter method in IHDR");
-      error = 1;
-   }
-#endif
-
-   if (error == 1)
-      png_error(png_ptr, "Invalid IHDR data");
-}
-
-#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
-/* ASCII to fp functions */
-/* Check an ASCII formated floating point value, see the more detailed
- * comments in pngpriv.h
- */
-/* The following is used internally to preserve the sticky flags */
-#define png_fp_add(state, flags) ((state) |= (flags))
-#define png_fp_set(state, value) ((state) = (value) | ((state) & PNG_FP_STICKY))
-
-int /* PRIVATE */
-png_check_fp_number(png_const_charp string, png_size_t size, int *statep,
-    png_size_tp whereami)
-{
-   int state = *statep;
-   png_size_t i = *whereami;
-
-   while (i < size)
-   {
-      int type;
-      /* First find the type of the next character */
-      switch (string[i])
-      {
-      case 43:  type = PNG_FP_SAW_SIGN;                   break;
-      case 45:  type = PNG_FP_SAW_SIGN + PNG_FP_NEGATIVE; break;
-      case 46:  type = PNG_FP_SAW_DOT;                    break;
-      case 48:  type = PNG_FP_SAW_DIGIT;                  break;
-      case 49: case 50: case 51: case 52:
-      case 53: case 54: case 55: case 56:
-      case 57:  type = PNG_FP_SAW_DIGIT + PNG_FP_NONZERO; break;
-      case 69:
-      case 101: type = PNG_FP_SAW_E;                      break;
-      default:  goto PNG_FP_End;
-      }
-
-      /* Now deal with this type according to the current
-       * state, the type is arranged to not overlap the
-       * bits of the PNG_FP_STATE.
-       */
-      switch ((state & PNG_FP_STATE) + (type & PNG_FP_SAW_ANY))
-      {
-      case PNG_FP_INTEGER + PNG_FP_SAW_SIGN:
-         if ((state & PNG_FP_SAW_ANY) != 0)
-            goto PNG_FP_End; /* not a part of the number */
-
-         png_fp_add(state, type);
-         break;
-
-      case PNG_FP_INTEGER + PNG_FP_SAW_DOT:
-         /* Ok as trailer, ok as lead of fraction. */
-         if ((state & PNG_FP_SAW_DOT) != 0) /* two dots */
-            goto PNG_FP_End;
-
-         else if ((state & PNG_FP_SAW_DIGIT) != 0) /* trailing dot? */
-            png_fp_add(state, type);
-
-         else
-            png_fp_set(state, PNG_FP_FRACTION | type);
-
-         break;
-
-      case PNG_FP_INTEGER + PNG_FP_SAW_DIGIT:
-         if ((state & PNG_FP_SAW_DOT) != 0) /* delayed fraction */
-            png_fp_set(state, PNG_FP_FRACTION | PNG_FP_SAW_DOT);
-
-         png_fp_add(state, type | PNG_FP_WAS_VALID);
-
-         break;
-
-      case PNG_FP_INTEGER + PNG_FP_SAW_E:
-         if ((state & PNG_FP_SAW_DIGIT) == 0)
-            goto PNG_FP_End;
-
-         png_fp_set(state, PNG_FP_EXPONENT);
-
-         break;
-
-   /* case PNG_FP_FRACTION + PNG_FP_SAW_SIGN:
-         goto PNG_FP_End; ** no sign in fraction */
-
-   /* case PNG_FP_FRACTION + PNG_FP_SAW_DOT:
-         goto PNG_FP_End; ** Because SAW_DOT is always set */
-
-      case PNG_FP_FRACTION + PNG_FP_SAW_DIGIT:
-         png_fp_add(state, type | PNG_FP_WAS_VALID);
-         break;
-
-      case PNG_FP_FRACTION + PNG_FP_SAW_E:
-         /* This is correct because the trailing '.' on an
-          * integer is handled above - so we can only get here
-          * with the sequence ".E" (with no preceding digits).
-          */
-         if ((state & PNG_FP_SAW_DIGIT) == 0)
-            goto PNG_FP_End;
-
-         png_fp_set(state, PNG_FP_EXPONENT);
-
-         break;
-
-      case PNG_FP_EXPONENT + PNG_FP_SAW_SIGN:
-         if ((state & PNG_FP_SAW_ANY) != 0)
-            goto PNG_FP_End; /* not a part of the number */
-
-         png_fp_add(state, PNG_FP_SAW_SIGN);
-
-         break;
-
-   /* case PNG_FP_EXPONENT + PNG_FP_SAW_DOT:
-         goto PNG_FP_End; */
-
-      case PNG_FP_EXPONENT + PNG_FP_SAW_DIGIT:
-         png_fp_add(state, PNG_FP_SAW_DIGIT | PNG_FP_WAS_VALID);
-
-         break;
-
-   /* case PNG_FP_EXPONEXT + PNG_FP_SAW_E:
-         goto PNG_FP_End; */
-
-      default: goto PNG_FP_End; /* I.e. break 2 */
-      }
-
-      /* The character seems ok, continue. */
-      ++i;
-   }
-
-PNG_FP_End:
-   /* Here at the end, update the state and return the correct
-    * return code.
-    */
-   *statep = state;
-   *whereami = i;
-
-   return (state & PNG_FP_SAW_DIGIT) != 0;
-}
-
-
-/* The same but for a complete string. */
-int
-png_check_fp_string(png_const_charp string, png_size_t size)
-{
-   int        state=0;
-   png_size_t char_index=0;
-
-   if (png_check_fp_number(string, size, &state, &char_index) != 0 &&
-      (char_index == size || string[char_index] == 0))
-      return state /* must be non-zero - see above */;
-
-   return 0; /* i.e. fail */
-}
-#endif /* pCAL || sCAL */
-
-#ifdef PNG_sCAL_SUPPORTED
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-/* Utility used below - a simple accurate power of ten from an integral
- * exponent.
- */
-static double
-png_pow10(int power)
-{
-   int recip = 0;
-   double d = 1;
-
-   /* Handle negative exponent with a reciprocal at the end because
-    * 10 is exact whereas .1 is inexact in base 2
-    */
-   if (power < 0)
-   {
-      if (power < DBL_MIN_10_EXP) return 0;
-      recip = 1; power = -power;
-   }
-
-   if (power > 0)
-   {
-      /* Decompose power bitwise. */
-      double mult = 10;
-      do
-      {
-         if (power & 1) d *= mult;
-         mult *= mult;
-         power >>= 1;
-      }
-      while (power > 0);
-
-      if (recip != 0) d = 1/d;
-   }
-   /* else power is 0 and d is 1 */
-
-   return d;
-}
-
-/* Function to format a floating point value in ASCII with a given
- * precision.
- */
-#if GCC_STRICT_OVERFLOW
-#pragma GCC diagnostic push
-/* The problem arises below with exp_b10, which can never overflow because it
- * comes, originally, from frexp and is therefore limited to a range which is
- * typically +/-710 (log2(DBL_MAX)/log2(DBL_MIN)).
- */
-#pragma GCC diagnostic warning "-Wstrict-overflow=2"
-#endif /* GCC_STRICT_OVERFLOW */
-void /* PRIVATE */
-png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
-    double fp, unsigned int precision)
-{
-   /* We use standard functions from math.h, but not printf because
-    * that would require stdio.  The caller must supply a buffer of
-    * sufficient size or we will png_error.  The tests on size and
-    * the space in ascii[] consumed are indicated below.
-    */
-   if (precision < 1)
-      precision = DBL_DIG;
-
-   /* Enforce the limit of the implementation precision too. */
-   if (precision > DBL_DIG+1)
-      precision = DBL_DIG+1;
-
-   /* Basic sanity checks */
-   if (size >= precision+5) /* See the requirements below. */
-   {
-      if (fp < 0)
-      {
-         fp = -fp;
-         *ascii++ = 45; /* '-'  PLUS 1 TOTAL 1 */
-         --size;
-      }
-
-      if (fp >= DBL_MIN && fp <= DBL_MAX)
-      {
-         int exp_b10;   /* A base 10 exponent */
-         double base;   /* 10^exp_b10 */
-
-         /* First extract a base 10 exponent of the number,
-          * the calculation below rounds down when converting
-          * from base 2 to base 10 (multiply by log10(2) -
-          * 0.3010, but 77/256 is 0.3008, so exp_b10 needs to
-          * be increased.  Note that the arithmetic shift
-          * performs a floor() unlike C arithmetic - using a
-          * C multiply would break the following for negative
-          * exponents.
-          */
-         (void)frexp(fp, &exp_b10); /* exponent to base 2 */
-
-         exp_b10 = (exp_b10 * 77) >> 8; /* <= exponent to base 10 */
-
-         /* Avoid underflow here. */
-         base = png_pow10(exp_b10); /* May underflow */
-
-         while (base < DBL_MIN || base < fp)
-         {
-            /* And this may overflow. */
-            double test = png_pow10(exp_b10+1);
-
-            if (test <= DBL_MAX)
-            {
-               ++exp_b10; base = test;
-            }
-
-            else
-               break;
-         }
-
-         /* Normalize fp and correct exp_b10, after this fp is in the
-          * range [.1,1) and exp_b10 is both the exponent and the digit
-          * *before* which the decimal point should be inserted
-          * (starting with 0 for the first digit).  Note that this
-          * works even if 10^exp_b10 is out of range because of the
-          * test on DBL_MAX above.
-          */
-         fp /= base;
-         while (fp >= 1)
-         {
-            fp /= 10; ++exp_b10;
-         }
-
-         /* Because of the code above fp may, at this point, be
-          * less than .1, this is ok because the code below can
-          * handle the leading zeros this generates, so no attempt
-          * is made to correct that here.
-          */
-
-         {
-            unsigned int czero, clead, cdigits;
-            char exponent[10];
-
-            /* Allow up to two leading zeros - this will not lengthen
-             * the number compared to using E-n.
-             */
-            if (exp_b10 < 0 && exp_b10 > -3) /* PLUS 3 TOTAL 4 */
-            {
-               czero = 0U-exp_b10; /* PLUS 2 digits: TOTAL 3 */
-               exp_b10 = 0;      /* Dot added below before first output. */
-            }
-            else
-               czero = 0;    /* No zeros to add */
-
-            /* Generate the digit list, stripping trailing zeros and
-             * inserting a '.' before a digit if the exponent is 0.
-             */
-            clead = czero; /* Count of leading zeros */
-            cdigits = 0;   /* Count of digits in list. */
-
-            do
-            {
-               double d;
-
-               fp *= 10;
-               /* Use modf here, not floor and subtract, so that
-                * the separation is done in one step.  At the end
-                * of the loop don't break the number into parts so
-                * that the final digit is rounded.
-                */
-               if (cdigits+czero+1 < precision+clead)
-                  fp = modf(fp, &d);
-
-               else
-               {
-                  d = floor(fp + .5);
-
-                  if (d > 9)
-                  {
-                     /* Rounding up to 10, handle that here. */
-                     if (czero > 0)
-                     {
-                        --czero; d = 1;
-                        if (cdigits == 0) --clead;
-                     }
-                     else
-                     {
-                        while (cdigits > 0 && d > 9)
-                        {
-                           int ch = *--ascii;
-
-                           if (exp_b10 != (-1))
-                              ++exp_b10;
-
-                           else if (ch == 46)
-                           {
-                              ch = *--ascii; ++size;
-                              /* Advance exp_b10 to '1', so that the
-                               * decimal point happens after the
-                               * previous digit.
-                               */
-                              exp_b10 = 1;
-                           }
-
-                           --cdigits;
-                           d = ch - 47;  /* I.e. 1+(ch-48) */
-                        }
-
-                        /* Did we reach the beginning? If so adjust the
-                         * exponent but take into account the leading
-                         * decimal point.
-                         */
-                        if (d > 9)  /* cdigits == 0 */
-                        {
-                           if (exp_b10 == (-1))
-                           {
-                              /* Leading decimal point (plus zeros?), if
-                               * we lose the decimal point here it must
-                               * be reentered below.
-                               */
-                              int ch = *--ascii;
-
-                              if (ch == 46)
-                              {
-                                 ++size; exp_b10 = 1;
-                              }
-
-                              /* Else lost a leading zero, so 'exp_b10' is
-                               * still ok at (-1)
-                               */
-                           }
-                           else
-                              ++exp_b10;
-
-                           /* In all cases we output a '1' */
-                           d = 1;
-                        }
-                     }
-                  }
-                  fp = 0; /* Guarantees termination below. */
-               }
-
-               if (d == 0)
-               {
-                  ++czero;
-                  if (cdigits == 0) ++clead;
-               }
-               else
-               {
-                  /* Included embedded zeros in the digit count. */
-                  cdigits += czero - clead;
-                  clead = 0;
-
-                  while (czero > 0)
-                  {
-                     /* exp_b10 == (-1) means we just output the decimal
-                      * place - after the DP don't adjust 'exp_b10' any
-                      * more!
-                      */
-                     if (exp_b10 != (-1))
-                     {
-                        if (exp_b10 == 0)
-                        {
-                           *ascii++ = 46; --size;
-                        }
-                        /* PLUS 1: TOTAL 4 */
-                        --exp_b10;
-                     }
-                     *ascii++ = 48; --czero;
-                  }
-
-                  if (exp_b10 != (-1))
-                  {
-                     if (exp_b10 == 0)
-                     {
-                        *ascii++ = 46; --size; /* counted above */
-                     }
-
-                     --exp_b10;
-                  }
-                  *ascii++ = (char)(48 + (int)d); ++cdigits;
-               }
-            }
-            while (cdigits+czero < precision+clead && fp > DBL_MIN);
-
-            /* The total output count (max) is now 4+precision */
-
-            /* Check for an exponent, if we don't need one we are
-             * done and just need to terminate the string.  At
-             * this point exp_b10==(-1) is effectively a flag - it got
-             * to '-1' because of the decrement after outputting
-             * the decimal point above (the exponent required is
-             * *not* -1!)
-             */
-            if (exp_b10 >= (-1) && exp_b10 <= 2)
-            {
-               /* The following only happens if we didn't output the
-                * leading zeros above for negative exponent, so this
-                * doesn't add to the digit requirement.  Note that the
-                * two zeros here can only be output if the two leading
-                * zeros were *not* output, so this doesn't increase
-                * the output count.
-                */
-               while (exp_b10-- > 0) *ascii++ = 48;
-
-               *ascii = 0;
-
-               /* Total buffer requirement (including the '\0') is
-                * 5+precision - see check at the start.
-                */
-               return;
-            }
-
-            /* Here if an exponent is required, adjust size for
-             * the digits we output but did not count.  The total
-             * digit output here so far is at most 1+precision - no
-             * decimal point and no leading or trailing zeros have
-             * been output.
-             */
-            size -= cdigits;
-
-            *ascii++ = 69; --size;    /* 'E': PLUS 1 TOTAL 2+precision */
-
-            /* The following use of an unsigned temporary avoids ambiguities in
-             * the signed arithmetic on exp_b10 and permits GCC at least to do
-             * better optimization.
-             */
-            {
-               unsigned int uexp_b10;
-
-               if (exp_b10 < 0)
-               {
-                  *ascii++ = 45; --size; /* '-': PLUS 1 TOTAL 3+precision */
-                  uexp_b10 = 0U-exp_b10;
-               }
-
-               else
-                  uexp_b10 = 0U+exp_b10;
-
-               cdigits = 0;
-
-               while (uexp_b10 > 0)
-               {
-                  exponent[cdigits++] = (char)(48 + uexp_b10 % 10);
-                  uexp_b10 /= 10;
-               }
-            }
-
-            /* Need another size check here for the exponent digits, so
-             * this need not be considered above.
-             */
-            if (size > cdigits)
-            {
-               while (cdigits > 0) *ascii++ = exponent[--cdigits];
-
-               *ascii = 0;
-
-               return;
-            }
-         }
-      }
-      else if (!(fp >= DBL_MIN))
-      {
-         *ascii++ = 48; /* '0' */
-         *ascii = 0;
-         return;
-      }
-      else
-      {
-         *ascii++ = 105; /* 'i' */
-         *ascii++ = 110; /* 'n' */
-         *ascii++ = 102; /* 'f' */
-         *ascii = 0;
-         return;
-      }
-   }
-
-   /* Here on buffer too small. */
-   png_error(png_ptr, "ASCII conversion buffer too small");
-}
-#if GCC_STRICT_OVERFLOW
-#pragma GCC diagnostic pop
-#endif /* GCC_STRICT_OVERFLOW */
-
-#  endif /* FLOATING_POINT */
-
-#  ifdef PNG_FIXED_POINT_SUPPORTED
-/* Function to format a fixed point value in ASCII.
- */
-void /* PRIVATE */
-png_ascii_from_fixed(png_const_structrp png_ptr, png_charp ascii,
-    png_size_t size, png_fixed_point fp)
-{
-   /* Require space for 10 decimal digits, a decimal point, a minus sign and a
-    * trailing \0, 13 characters:
-    */
-   if (size > 12)
-   {
-      png_uint_32 num;
-
-      /* Avoid overflow here on the minimum integer. */
-      if (fp < 0)
-      {
-         *ascii++ = 45; num = (png_uint_32)(-fp);
-      }
-      else
-         num = (png_uint_32)fp;
-
-      if (num <= 0x80000000) /* else overflowed */
-      {
-         unsigned int ndigits = 0, first = 16 /* flag value */;
-         char digits[10];
-
-         while (num)
-         {
-            /* Split the low digit off num: */
-            unsigned int tmp = num/10;
-            num -= tmp*10;
-            digits[ndigits++] = (char)(48 + num);
-            /* Record the first non-zero digit, note that this is a number
-             * starting at 1, it's not actually the array index.
-             */
-            if (first == 16 && num > 0)
-               first = ndigits;
-            num = tmp;
-         }
-
-         if (ndigits > 0)
-         {
-            while (ndigits > 5) *ascii++ = digits[--ndigits];
-            /* The remaining digits are fractional digits, ndigits is '5' or
-             * smaller at this point.  It is certainly not zero.  Check for a
-             * non-zero fractional digit:
-             */
-            if (first <= 5)
-            {
-               unsigned int i;
-               *ascii++ = 46; /* decimal point */
-               /* ndigits may be <5 for small numbers, output leading zeros
-                * then ndigits digits to first:
-                */
-               i = 5;
-               while (ndigits < i)
-               {
-                  *ascii++ = 48; --i;
-               }
-               while (ndigits >= first) *ascii++ = digits[--ndigits];
-               /* Don't output the trailing zeros! */
-            }
-         }
-         else
-            *ascii++ = 48;
-
-         /* And null terminate the string: */
-         *ascii = 0;
-         return;
-      }
-   }
-
-   /* Here on buffer too small. */
-   png_error(png_ptr, "ASCII conversion buffer too small");
-}
-#   endif /* FIXED_POINT */
-#endif /* SCAL */
-
-#if defined(PNG_FLOATING_POINT_SUPPORTED) && \
-   !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
-   (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
-   defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
-   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
-   (defined(PNG_sCAL_SUPPORTED) && \
-   defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
-png_fixed_point
-png_fixed(png_const_structrp png_ptr, double fp, png_const_charp text)
-{
-   double r = floor(100000 * fp + .5);
-
-   if (r > 2147483647. || r < -2147483648.)
-      png_fixed_error(png_ptr, text);
-
-#  ifndef PNG_ERROR_TEXT_SUPPORTED
-   PNG_UNUSED(text)
-#  endif
-
-   return (png_fixed_point)r;
-}
-#endif
-
-#if defined(PNG_GAMMA_SUPPORTED) || defined(PNG_COLORSPACE_SUPPORTED) ||\
-    defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
-/* muldiv functions */
-/* This API takes signed arguments and rounds the result to the nearest
- * integer (or, for a fixed point number - the standard argument - to
- * the nearest .00001).  Overflow and divide by zero are signalled in
- * the result, a boolean - true on success, false on overflow.
- */
-#if GCC_STRICT_OVERFLOW /* from above */
-/* It is not obvious which comparison below gets optimized in such a way that
- * signed overflow would change the result; looking through the code does not
- * reveal any tests which have the form GCC complains about, so presumably the
- * optimizer is moving an add or subtract into the 'if' somewhere.
- */
-#pragma GCC diagnostic push
-#pragma GCC diagnostic warning "-Wstrict-overflow=2"
-#endif /* GCC_STRICT_OVERFLOW */
-int
-png_muldiv(png_fixed_point_p res, png_fixed_point a, png_int_32 times,
-    png_int_32 divisor)
-{
-   /* Return a * times / divisor, rounded. */
-   if (divisor != 0)
-   {
-      if (a == 0 || times == 0)
-      {
-         *res = 0;
-         return 1;
-      }
-      else
-      {
-#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
-         double r = a;
-         r *= times;
-         r /= divisor;
-         r = floor(r+.5);
-
-         /* A png_fixed_point is a 32-bit integer. */
-         if (r <= 2147483647. && r >= -2147483648.)
-         {
-            *res = (png_fixed_point)r;
-            return 1;
-         }
-#else
-         int negative = 0;
-         png_uint_32 A, T, D;
-         png_uint_32 s16, s32, s00;
-
-         if (a < 0)
-            negative = 1, A = -a;
-         else
-            A = a;
-
-         if (times < 0)
-            negative = !negative, T = -times;
-         else
-            T = times;
-
-         if (divisor < 0)
-            negative = !negative, D = -divisor;
-         else
-            D = divisor;
-
-         /* Following can't overflow because the arguments only
-          * have 31 bits each, however the result may be 32 bits.
-          */
-         s16 = (A >> 16) * (T & 0xffff) +
-                           (A & 0xffff) * (T >> 16);
-         /* Can't overflow because the a*times bit is only 30
-          * bits at most.
-          */
-         s32 = (A >> 16) * (T >> 16) + (s16 >> 16);
-         s00 = (A & 0xffff) * (T & 0xffff);
-
-         s16 = (s16 & 0xffff) << 16;
-         s00 += s16;
-
-         if (s00 < s16)
-            ++s32; /* carry */
-
-         if (s32 < D) /* else overflow */
-         {
-            /* s32.s00 is now the 64-bit product, do a standard
-             * division, we know that s32 < D, so the maximum
-             * required shift is 31.
-             */
-            int bitshift = 32;
-            png_fixed_point result = 0; /* NOTE: signed */
-
-            while (--bitshift >= 0)
-            {
-               png_uint_32 d32, d00;
-
-               if (bitshift > 0)
-                  d32 = D >> (32-bitshift), d00 = D << bitshift;
-
-               else
-                  d32 = 0, d00 = D;
-
-               if (s32 > d32)
-               {
-                  if (s00 < d00) --s32; /* carry */
-                  s32 -= d32, s00 -= d00, result += 1<<bitshift;
-               }
-
-               else
-                  if (s32 == d32 && s00 >= d00)
-                     s32 = 0, s00 -= d00, result += 1<<bitshift;
-            }
-
-            /* Handle the rounding. */
-            if (s00 >= (D >> 1))
-               ++result;
-
-            if (negative != 0)
-               result = -result;
-
-            /* Check for overflow. */
-            if ((negative != 0 && result <= 0) ||
-                (negative == 0 && result >= 0))
-            {
-               *res = result;
-               return 1;
-            }
-         }
-#endif
-      }
-   }
-
-   return 0;
-}
-#if GCC_STRICT_OVERFLOW
-#pragma GCC diagnostic pop
-#endif /* GCC_STRICT_OVERFLOW */
-#endif /* READ_GAMMA || INCH_CONVERSIONS */
-
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
-/* The following is for when the caller doesn't much care about the
- * result.
- */
-png_fixed_point
-png_muldiv_warn(png_const_structrp png_ptr, png_fixed_point a, png_int_32 times,
-    png_int_32 divisor)
-{
-   png_fixed_point result;
-
-   if (png_muldiv(&result, a, times, divisor) != 0)
-      return result;
-
-   png_warning(png_ptr, "fixed point overflow ignored");
-   return 0;
-}
-#endif
-
-#ifdef PNG_GAMMA_SUPPORTED /* more fixed point functions for gamma */
-/* Calculate a reciprocal, return 0 on div-by-zero or overflow. */
-png_fixed_point
-png_reciprocal(png_fixed_point a)
-{
-#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
-   double r = floor(1E10/a+.5);
-
-   if (r <= 2147483647. && r >= -2147483648.)
-      return (png_fixed_point)r;
-#else
-   png_fixed_point res;
-
-   if (png_muldiv(&res, 100000, 100000, a) != 0)
-      return res;
-#endif
-
-   return 0; /* error/overflow */
-}
-
-/* This is the shared test on whether a gamma value is 'significant' - whether
- * it is worth doing gamma correction.
- */
-int /* PRIVATE */
-png_gamma_significant(png_fixed_point gamma_val)
-{
-   return gamma_val < PNG_FP_1 - PNG_GAMMA_THRESHOLD_FIXED ||
-       gamma_val > PNG_FP_1 + PNG_GAMMA_THRESHOLD_FIXED;
-}
-#endif
-
-#ifdef PNG_READ_GAMMA_SUPPORTED
-#ifdef PNG_16BIT_SUPPORTED
-/* A local convenience routine. */
-static png_fixed_point
-png_product2(png_fixed_point a, png_fixed_point b)
-{
-   /* The required result is 1/a * 1/b; the following preserves accuracy. */
-#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
-   double r = a * 1E-5;
-   r *= b;
-   r = floor(r+.5);
-
-   if (r <= 2147483647. && r >= -2147483648.)
-      return (png_fixed_point)r;
-#else
-   png_fixed_point res;
-
-   if (png_muldiv(&res, a, b, 100000) != 0)
-      return res;
-#endif
-
-   return 0; /* overflow */
-}
-#endif /* 16BIT */
-
-/* The inverse of the above. */
-png_fixed_point
-png_reciprocal2(png_fixed_point a, png_fixed_point b)
-{
-   /* The required result is 1/a * 1/b; the following preserves accuracy. */
-#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
-   if (a != 0 && b != 0)
-   {
-      double r = 1E15/a;
-      r /= b;
-      r = floor(r+.5);
-
-      if (r <= 2147483647. && r >= -2147483648.)
-         return (png_fixed_point)r;
-   }
-#else
-   /* This may overflow because the range of png_fixed_point isn't symmetric,
-    * but this API is only used for the product of file and screen gamma so it
-    * doesn't matter that the smallest number it can produce is 1/21474, not
-    * 1/100000
-    */
-   png_fixed_point res = png_product2(a, b);
-
-   if (res != 0)
-      return png_reciprocal(res);
-#endif
-
-   return 0; /* overflow */
-}
-#endif /* READ_GAMMA */
-
-#ifdef PNG_READ_GAMMA_SUPPORTED /* gamma table code */
-#ifndef PNG_FLOATING_ARITHMETIC_SUPPORTED
-/* Fixed point gamma.
- *
- * The code to calculate the tables used below can be found in the shell script
- * contrib/tools/intgamma.sh
- *
- * To calculate gamma this code implements fast log() and exp() calls using only
- * fixed point arithmetic.  This code has sufficient precision for either 8-bit
- * or 16-bit sample values.
- *
- * The tables used here were calculated using simple 'bc' programs, but C double
- * precision floating point arithmetic would work fine.
- *
- * 8-bit log table
- *   This is a table of -log(value/255)/log(2) for 'value' in the range 128 to
- *   255, so it's the base 2 logarithm of a normalized 8-bit floating point
- *   mantissa.  The numbers are 32-bit fractions.
- */
-static const png_uint_32
-png_8bit_l2[128] =
-{
-   4270715492U, 4222494797U, 4174646467U, 4127164793U, 4080044201U, 4033279239U,
-   3986864580U, 3940795015U, 3895065449U, 3849670902U, 3804606499U, 3759867474U,
-   3715449162U, 3671346997U, 3627556511U, 3584073329U, 3540893168U, 3498011834U,
-   3455425220U, 3413129301U, 3371120137U, 3329393864U, 3287946700U, 3246774933U,
-   3205874930U, 3165243125U, 3124876025U, 3084770202U, 3044922296U, 3005329011U,
-   2965987113U, 2926893432U, 2888044853U, 2849438323U, 2811070844U, 2772939474U,
-   2735041326U, 2697373562U, 2659933400U, 2622718104U, 2585724991U, 2548951424U,
-   2512394810U, 2476052606U, 2439922311U, 2404001468U, 2368287663U, 2332778523U,
-   2297471715U, 2262364947U, 2227455964U, 2192742551U, 2158222529U, 2123893754U,
-   2089754119U, 2055801552U, 2022034013U, 1988449497U, 1955046031U, 1921821672U,
-   1888774511U, 1855902668U, 1823204291U, 1790677560U, 1758320682U, 1726131893U,
-   1694109454U, 1662251657U, 1630556815U, 1599023271U, 1567649391U, 1536433567U,
-   1505374214U, 1474469770U, 1443718700U, 1413119487U, 1382670639U, 1352370686U,
-   1322218179U, 1292211689U, 1262349810U, 1232631153U, 1203054352U, 1173618059U,
-   1144320946U, 1115161701U, 1086139034U, 1057251672U, 1028498358U, 999877854U,
-   971388940U, 943030410U, 914801076U, 886699767U, 858725327U, 830876614U,
-   803152505U, 775551890U, 748073672U, 720716771U, 693480120U, 666362667U,
-   639363374U, 612481215U, 585715177U, 559064263U, 532527486U, 506103872U,
-   479792461U, 453592303U, 427502463U, 401522014U, 375650043U, 349885648U,
-   324227938U, 298676034U, 273229066U, 247886176U, 222646516U, 197509248U,
-   172473545U, 147538590U, 122703574U, 97967701U, 73330182U, 48790236U,
-   24347096U, 0U
-
-#if 0
-   /* The following are the values for 16-bit tables - these work fine for the
-    * 8-bit conversions but produce very slightly larger errors in the 16-bit
-    * log (about 1.2 as opposed to 0.7 absolute error in the final value).  To
-    * use these all the shifts below must be adjusted appropriately.
-    */
-   65166, 64430, 63700, 62976, 62257, 61543, 60835, 60132, 59434, 58741, 58054,
-   57371, 56693, 56020, 55352, 54689, 54030, 53375, 52726, 52080, 51439, 50803,
-   50170, 49542, 48918, 48298, 47682, 47070, 46462, 45858, 45257, 44661, 44068,
-   43479, 42894, 42312, 41733, 41159, 40587, 40020, 39455, 38894, 38336, 37782,
-   37230, 36682, 36137, 35595, 35057, 34521, 33988, 33459, 32932, 32408, 31887,
-   31369, 30854, 30341, 29832, 29325, 28820, 28319, 27820, 27324, 26830, 26339,
-   25850, 25364, 24880, 24399, 23920, 23444, 22970, 22499, 22029, 21562, 21098,
-   20636, 20175, 19718, 19262, 18808, 18357, 17908, 17461, 17016, 16573, 16132,
-   15694, 15257, 14822, 14390, 13959, 13530, 13103, 12678, 12255, 11834, 11415,
-   10997, 10582, 10168, 9756, 9346, 8937, 8531, 8126, 7723, 7321, 6921, 6523,
-   6127, 5732, 5339, 4947, 4557, 4169, 3782, 3397, 3014, 2632, 2251, 1872, 1495,
-   1119, 744, 372
-#endif
-};
-
-static png_int_32
-png_log8bit(unsigned int x)
-{
-   unsigned int lg2 = 0;
-   /* Each time 'x' is multiplied by 2, 1 must be subtracted off the final log,
-    * because the log is actually negate that means adding 1.  The final
-    * returned value thus has the range 0 (for 255 input) to 7.994 (for 1
-    * input), return -1 for the overflow (log 0) case, - so the result is
-    * always at most 19 bits.
-    */
-   if ((x &= 0xff) == 0)
-      return -1;
-
-   if ((x & 0xf0) == 0)
-      lg2  = 4, x <<= 4;
-
-   if ((x & 0xc0) == 0)
-      lg2 += 2, x <<= 2;
-
-   if ((x & 0x80) == 0)
-      lg2 += 1, x <<= 1;
-
-   /* result is at most 19 bits, so this cast is safe: */
-   return (png_int_32)((lg2 << 16) + ((png_8bit_l2[x-128]+32768)>>16));
-}
-
-/* The above gives exact (to 16 binary places) log2 values for 8-bit images,
- * for 16-bit images we use the most significant 8 bits of the 16-bit value to
- * get an approximation then multiply the approximation by a correction factor
- * determined by the remaining up to 8 bits.  This requires an additional step
- * in the 16-bit case.
- *
- * We want log2(value/65535), we have log2(v'/255), where:
- *
- *    value = v' * 256 + v''
- *          = v' * f
- *
- * So f is value/v', which is equal to (256+v''/v') since v' is in the range 128
- * to 255 and v'' is in the range 0 to 255 f will be in the range 256 to less
- * than 258.  The final factor also needs to correct for the fact that our 8-bit
- * value is scaled by 255, whereas the 16-bit values must be scaled by 65535.
- *
- * This gives a final formula using a calculated value 'x' which is value/v' and
- * scaling by 65536 to match the above table:
- *
- *   log2(x/257) * 65536
- *
- * Since these numbers are so close to '1' we can use simple linear
- * interpolation between the two end values 256/257 (result -368.61) and 258/257
- * (result 367.179).  The values used below are scaled by a further 64 to give
- * 16-bit precision in the interpolation:
- *
- * Start (256): -23591
- * Zero  (257):      0
- * End   (258):  23499
- */
-#ifdef PNG_16BIT_SUPPORTED
-static png_int_32
-png_log16bit(png_uint_32 x)
-{
-   unsigned int lg2 = 0;
-
-   /* As above, but now the input has 16 bits. */
-   if ((x &= 0xffff) == 0)
-      return -1;
-
-   if ((x & 0xff00) == 0)
-      lg2  = 8, x <<= 8;
-
-   if ((x & 0xf000) == 0)
-      lg2 += 4, x <<= 4;
-
-   if ((x & 0xc000) == 0)
-      lg2 += 2, x <<= 2;
-
-   if ((x & 0x8000) == 0)
-      lg2 += 1, x <<= 1;
-
-   /* Calculate the base logarithm from the top 8 bits as a 28-bit fractional
-    * value.
-    */
-   lg2 <<= 28;
-   lg2 += (png_8bit_l2[(x>>8)-128]+8) >> 4;
-
-   /* Now we need to interpolate the factor, this requires a division by the top
-    * 8 bits.  Do this with maximum precision.
-    */
-   x = ((x << 16) + (x >> 9)) / (x >> 8);
-
-   /* Since we divided by the top 8 bits of 'x' there will be a '1' at 1<<24,
-    * the value at 1<<16 (ignoring this) will be 0 or 1; this gives us exactly
-    * 16 bits to interpolate to get the low bits of the result.  Round the
-    * answer.  Note that the end point values are scaled by 64 to retain overall
-    * precision and that 'lg2' is current scaled by an extra 12 bits, so adjust
-    * the overall scaling by 6-12.  Round at every step.
-    */
-   x -= 1U << 24;
-
-   if (x <= 65536U) /* <= '257' */
-      lg2 += ((23591U * (65536U-x)) + (1U << (16+6-12-1))) >> (16+6-12);
-
-   else
-      lg2 -= ((23499U * (x-65536U)) + (1U << (16+6-12-1))) >> (16+6-12);
-
-   /* Safe, because the result can't have more than 20 bits: */
-   return (png_int_32)((lg2 + 2048) >> 12);
-}
-#endif /* 16BIT */
-
-/* The 'exp()' case must invert the above, taking a 20-bit fixed point
- * logarithmic value and returning a 16 or 8-bit number as appropriate.  In
- * each case only the low 16 bits are relevant - the fraction - since the
- * integer bits (the top 4) simply determine a shift.
- *
- * The worst case is the 16-bit distinction between 65535 and 65534. This
- * requires perhaps spurious accuracy in the decoding of the logarithm to
- * distinguish log2(65535/65534.5) - 10^-5 or 17 bits.  There is little chance
- * of getting this accuracy in practice.
- *
- * To deal with this the following exp() function works out the exponent of the
- * fractional part of the logarithm by using an accurate 32-bit value from the
- * top four fractional bits then multiplying in the remaining bits.
- */
-static const png_uint_32
-png_32bit_exp[16] =
-{
-   /* NOTE: the first entry is deliberately set to the maximum 32-bit value. */
-   4294967295U, 4112874773U, 3938502376U, 3771522796U, 3611622603U, 3458501653U,
-   3311872529U, 3171459999U, 3037000500U, 2908241642U, 2784941738U, 2666869345U,
-   2553802834U, 2445529972U, 2341847524U, 2242560872U
-};
-
-/* Adjustment table; provided to explain the numbers in the code below. */
-#if 0
-for (i=11;i>=0;--i){ print i, " ", (1 - e(-(2^i)/65536*l(2))) * 2^(32-i), "\n"}
-   11 44937.64284865548751208448
-   10 45180.98734845585101160448
-    9 45303.31936980687359311872
-    8 45364.65110595323018870784
-    7 45395.35850361789624614912
-    6 45410.72259715102037508096
-    5 45418.40724413220722311168
-    4 45422.25021786898173001728
-    3 45424.17186732298419044352
-    2 45425.13273269940811464704
-    1 45425.61317555035558641664
-    0 45425.85339951654943850496
-#endif
-
-static png_uint_32
-png_exp(png_fixed_point x)
-{
-   if (x > 0 && x <= 0xfffff) /* Else overflow or zero (underflow) */
-   {
-      /* Obtain a 4-bit approximation */
-      png_uint_32 e = png_32bit_exp[(x >> 12) & 0x0f];
-
-      /* Incorporate the low 12 bits - these decrease the returned value by
-       * multiplying by a number less than 1 if the bit is set.  The multiplier
-       * is determined by the above table and the shift. Notice that the values
-       * converge on 45426 and this is used to allow linear interpolation of the
-       * low bits.
-       */
-      if (x & 0x800)
-         e -= (((e >> 16) * 44938U) +  16U) >> 5;
-
-      if (x & 0x400)
-         e -= (((e >> 16) * 45181U) +  32U) >> 6;
-
-      if (x & 0x200)
-         e -= (((e >> 16) * 45303U) +  64U) >> 7;
-
-      if (x & 0x100)
-         e -= (((e >> 16) * 45365U) + 128U) >> 8;
-
-      if (x & 0x080)
-         e -= (((e >> 16) * 45395U) + 256U) >> 9;
-
-      if (x & 0x040)
-         e -= (((e >> 16) * 45410U) + 512U) >> 10;
-
-      /* And handle the low 6 bits in a single block. */
-      e -= (((e >> 16) * 355U * (x & 0x3fU)) + 256U) >> 9;
-
-      /* Handle the upper bits of x. */
-      e >>= x >> 16;
-      return e;
-   }
-
-   /* Check for overflow */
-   if (x <= 0)
-      return png_32bit_exp[0];
-
-   /* Else underflow */
-   return 0;
-}
-
-static png_byte
-png_exp8bit(png_fixed_point lg2)
-{
-   /* Get a 32-bit value: */
-   png_uint_32 x = png_exp(lg2);
-
-   /* Convert the 32-bit value to 0..255 by multiplying by 256-1. Note that the
-    * second, rounding, step can't overflow because of the first, subtraction,
-    * step.
-    */
-   x -= x >> 8;
-   return (png_byte)(((x + 0x7fffffU) >> 24) & 0xff);
-}
-
-#ifdef PNG_16BIT_SUPPORTED
-static png_uint_16
-png_exp16bit(png_fixed_point lg2)
-{
-   /* Get a 32-bit value: */
-   png_uint_32 x = png_exp(lg2);
-
-   /* Convert the 32-bit value to 0..65535 by multiplying by 65536-1: */
-   x -= x >> 16;
-   return (png_uint_16)((x + 32767U) >> 16);
-}
-#endif /* 16BIT */
-#endif /* FLOATING_ARITHMETIC */
-
-png_byte
-png_gamma_8bit_correct(unsigned int value, png_fixed_point gamma_val)
-{
-   if (value > 0 && value < 255)
-   {
-#     ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
-         /* 'value' is unsigned, ANSI-C90 requires the compiler to correctly
-          * convert this to a floating point value.  This includes values that
-          * would overflow if 'value' were to be converted to 'int'.
-          *
-          * Apparently GCC, however, does an intermediate conversion to (int)
-          * on some (ARM) but not all (x86) platforms, possibly because of
-          * hardware FP limitations.  (E.g. if the hardware conversion always
-          * assumes the integer register contains a signed value.)  This results
-          * in ANSI-C undefined behavior for large values.
-          *
-          * Other implementations on the same machine might actually be ANSI-C90
-          * conformant and therefore compile spurious extra code for the large
-          * values.
-          *
-          * We can be reasonably sure that an unsigned to float conversion
-          * won't be faster than an int to float one.  Therefore this code
-          * assumes responsibility for the undefined behavior, which it knows
-          * can't happen because of the check above.
-          *
-          * Note the argument to this routine is an (unsigned int) because, on
-          * 16-bit platforms, it is assigned a value which might be out of
-          * range for an (int); that would result in undefined behavior in the
-          * caller if the *argument* ('value') were to be declared (int).
-          */
-         double r = floor(255*pow((int)/*SAFE*/value/255.,gamma_val*.00001)+.5);
-         return (png_byte)r;
-#     else
-         png_int_32 lg2 = png_log8bit(value);
-         png_fixed_point res;
-
-         if (png_muldiv(&res, gamma_val, lg2, PNG_FP_1) != 0)
-            return png_exp8bit(res);
-
-         /* Overflow. */
-         value = 0;
-#     endif
-   }
-
-   return (png_byte)(value & 0xff);
-}
-
-#ifdef PNG_16BIT_SUPPORTED
-png_uint_16
-png_gamma_16bit_correct(unsigned int value, png_fixed_point gamma_val)
-{
-   if (value > 0 && value < 65535)
-   {
-# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
-      /* The same (unsigned int)->(double) constraints apply here as above,
-       * however in this case the (unsigned int) to (int) conversion can
-       * overflow on an ANSI-C90 compliant system so the cast needs to ensure
-       * that this is not possible.
-       */
-      double r = floor(65535*pow((png_int_32)value/65535.,
-          gamma_val*.00001)+.5);
-      return (png_uint_16)r;
-# else
-      png_int_32 lg2 = png_log16bit(value);
-      png_fixed_point res;
-
-      if (png_muldiv(&res, gamma_val, lg2, PNG_FP_1) != 0)
-         return png_exp16bit(res);
-
-      /* Overflow. */
-      value = 0;
-# endif
-   }
-
-   return (png_uint_16)value;
-}
-#endif /* 16BIT */
-
-/* This does the right thing based on the bit_depth field of the
- * png_struct, interpreting values as 8-bit or 16-bit.  While the result
- * is nominally a 16-bit value if bit depth is 8 then the result is
- * 8-bit (as are the arguments.)
- */
-png_uint_16 /* PRIVATE */
-png_gamma_correct(png_structrp png_ptr, unsigned int value,
-    png_fixed_point gamma_val)
-{
-   if (png_ptr->bit_depth == 8)
-      return png_gamma_8bit_correct(value, gamma_val);
-
-#ifdef PNG_16BIT_SUPPORTED
-   else
-      return png_gamma_16bit_correct(value, gamma_val);
-#else
-      /* should not reach this */
-      return 0;
-#endif /* 16BIT */
-}
-
-#ifdef PNG_16BIT_SUPPORTED
-/* Internal function to build a single 16-bit table - the table consists of
- * 'num' 256 entry subtables, where 'num' is determined by 'shift' - the amount
- * to shift the input values right (or 16-number_of_signifiant_bits).
- *
- * The caller is responsible for ensuring that the table gets cleaned up on
- * png_error (i.e. if one of the mallocs below fails) - i.e. the *table argument
- * should be somewhere that will be cleaned.
- */
-static void
-png_build_16bit_table(png_structrp png_ptr, png_uint_16pp *ptable,
-    PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val)
-{
-   /* Various values derived from 'shift': */
-   PNG_CONST unsigned int num = 1U << (8U - shift);
-#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
-   /* CSE the division and work round wacky GCC warnings (see the comments
-    * in png_gamma_8bit_correct for where these come from.)
-    */
-   PNG_CONST double fmax = 1./(((png_int_32)1 << (16U - shift))-1);
-#endif
-   PNG_CONST unsigned int max = (1U << (16U - shift))-1U;
-   PNG_CONST unsigned int max_by_2 = 1U << (15U-shift);
-   unsigned int i;
-
-   png_uint_16pp table = *ptable =
-       (png_uint_16pp)png_calloc(png_ptr, num * (sizeof (png_uint_16p)));
-
-   for (i = 0; i < num; i++)
-   {
-      png_uint_16p sub_table = table[i] =
-          (png_uint_16p)png_malloc(png_ptr, 256 * (sizeof (png_uint_16)));
-
-      /* The 'threshold' test is repeated here because it can arise for one of
-       * the 16-bit tables even if the others don't hit it.
-       */
-      if (png_gamma_significant(gamma_val) != 0)
-      {
-         /* The old code would overflow at the end and this would cause the
-          * 'pow' function to return a result >1, resulting in an
-          * arithmetic error.  This code follows the spec exactly; ig is
-          * the recovered input sample, it always has 8-16 bits.
-          *
-          * We want input * 65535/max, rounded, the arithmetic fits in 32
-          * bits (unsigned) so long as max <= 32767.
-          */
-         unsigned int j;
-         for (j = 0; j < 256; j++)
-         {
-            png_uint_32 ig = (j << (8-shift)) + i;
-#           ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
-               /* Inline the 'max' scaling operation: */
-               /* See png_gamma_8bit_correct for why the cast to (int) is
-                * required here.
-                */
-               double d = floor(65535.*pow(ig*fmax, gamma_val*.00001)+.5);
-               sub_table[j] = (png_uint_16)d;
-#           else
-               if (shift != 0)
-                  ig = (ig * 65535U + max_by_2)/max;
-
-               sub_table[j] = png_gamma_16bit_correct(ig, gamma_val);
-#           endif
-         }
-      }
-      else
-      {
-         /* We must still build a table, but do it the fast way. */
-         unsigned int j;
-
-         for (j = 0; j < 256; j++)
-         {
-            png_uint_32 ig = (j << (8-shift)) + i;
-
-            if (shift != 0)
-               ig = (ig * 65535U + max_by_2)/max;
-
-            sub_table[j] = (png_uint_16)ig;
-         }
-      }
-   }
-}
-
-/* NOTE: this function expects the *inverse* of the overall gamma transformation
- * required.
- */
-static void
-png_build_16to8_table(png_structrp png_ptr, png_uint_16pp *ptable,
-    PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val)
-{
-   PNG_CONST unsigned int num = 1U << (8U - shift);
-   PNG_CONST unsigned int max = (1U << (16U - shift))-1U;
-   unsigned int i;
-   png_uint_32 last;
-
-   png_uint_16pp table = *ptable =
-       (png_uint_16pp)png_calloc(png_ptr, num * (sizeof (png_uint_16p)));
-
-   /* 'num' is the number of tables and also the number of low bits of low
-    * bits of the input 16-bit value used to select a table.  Each table is
-    * itself indexed by the high 8 bits of the value.
-    */
-   for (i = 0; i < num; i++)
-      table[i] = (png_uint_16p)png_malloc(png_ptr,
-          256 * (sizeof (png_uint_16)));
-
-   /* 'gamma_val' is set to the reciprocal of the value calculated above, so
-    * pow(out,g) is an *input* value.  'last' is the last input value set.
-    *
-    * In the loop 'i' is used to find output values.  Since the output is
-    * 8-bit there are only 256 possible values.  The tables are set up to
-    * select the closest possible output value for each input by finding
-    * the input value at the boundary between each pair of output values
-    * and filling the table up to that boundary with the lower output
-    * value.
-    *
-    * The boundary values are 0.5,1.5..253.5,254.5.  Since these are 9-bit
-    * values the code below uses a 16-bit value in i; the values start at
-    * 128.5 (for 0.5) and step by 257, for a total of 254 values (the last
-    * entries are filled with 255).  Start i at 128 and fill all 'last'
-    * table entries <= 'max'
-    */
-   last = 0;
-   for (i = 0; i < 255; ++i) /* 8-bit output value */
-   {
-      /* Find the corresponding maximum input value */
-      png_uint_16 out = (png_uint_16)(i * 257U); /* 16-bit output value */
-
-      /* Find the boundary value in 16 bits: */
-      png_uint_32 bound = png_gamma_16bit_correct(out+128U, gamma_val);
-
-      /* Adjust (round) to (16-shift) bits: */
-      bound = (bound * max + 32768U)/65535U + 1U;
-
-      while (last < bound)
-      {
-         table[last & (0xffU >> shift)][last >> (8U - shift)] = out;
-         last++;
-      }
-   }
-
-   /* And fill in the final entries. */
-   while (last < (num << 8))
-   {
-      table[last & (0xff >> shift)][last >> (8U - shift)] = 65535U;
-      last++;
-   }
-}
-#endif /* 16BIT */
-
-/* Build a single 8-bit table: same as the 16-bit case but much simpler (and
- * typically much faster).  Note that libpng currently does no sBIT processing
- * (apparently contrary to the spec) so a 256-entry table is always generated.
- */
-static void
-png_build_8bit_table(png_structrp png_ptr, png_bytepp ptable,
-    PNG_CONST png_fixed_point gamma_val)
-{
-   unsigned int i;
-   png_bytep table = *ptable = (png_bytep)png_malloc(png_ptr, 256);
-
-   if (png_gamma_significant(gamma_val) != 0)
-      for (i=0; i<256; i++)
-         table[i] = png_gamma_8bit_correct(i, gamma_val);
-
-   else
-      for (i=0; i<256; ++i)
-         table[i] = (png_byte)(i & 0xff);
-}
-
-/* Used from png_read_destroy and below to release the memory used by the gamma
- * tables.
- */
-void /* PRIVATE */
-png_destroy_gamma_table(png_structrp png_ptr)
-{
-   png_free(png_ptr, png_ptr->gamma_table);
-   png_ptr->gamma_table = NULL;
-
-#ifdef PNG_16BIT_SUPPORTED
-   if (png_ptr->gamma_16_table != NULL)
-   {
-      int i;
-      int istop = (1 << (8 - png_ptr->gamma_shift));
-      for (i = 0; i < istop; i++)
-      {
-         png_free(png_ptr, png_ptr->gamma_16_table[i]);
-      }
-   png_free(png_ptr, png_ptr->gamma_16_table);
-   png_ptr->gamma_16_table = NULL;
-   }
-#endif /* 16BIT */
-
-#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
-   defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
-   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-   png_free(png_ptr, png_ptr->gamma_from_1);
-   png_ptr->gamma_from_1 = NULL;
-   png_free(png_ptr, png_ptr->gamma_to_1);
-   png_ptr->gamma_to_1 = NULL;
-
-#ifdef PNG_16BIT_SUPPORTED
-   if (png_ptr->gamma_16_from_1 != NULL)
-   {
-      int i;
-      int istop = (1 << (8 - png_ptr->gamma_shift));
-      for (i = 0; i < istop; i++)
-      {
-         png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
-      }
-   png_free(png_ptr, png_ptr->gamma_16_from_1);
-   png_ptr->gamma_16_from_1 = NULL;
-   }
-   if (png_ptr->gamma_16_to_1 != NULL)
-   {
-      int i;
-      int istop = (1 << (8 - png_ptr->gamma_shift));
-      for (i = 0; i < istop; i++)
-      {
-         png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
-      }
-   png_free(png_ptr, png_ptr->gamma_16_to_1);
-   png_ptr->gamma_16_to_1 = NULL;
-   }
-#endif /* 16BIT */
-#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
-}
-
-/* We build the 8- or 16-bit gamma tables here.  Note that for 16-bit
- * tables, we don't make a full table if we are reducing to 8-bit in
- * the future.  Note also how the gamma_16 tables are segmented so that
- * we don't need to allocate > 64K chunks for a full 16-bit table.
- */
-void /* PRIVATE */
-png_build_gamma_table(png_structrp png_ptr, int bit_depth)
-{
-   png_debug(1, "in png_build_gamma_table");
-
-   /* Remove any existing table; this copes with multiple calls to
-    * png_read_update_info. The warning is because building the gamma tables
-    * multiple times is a performance hit - it's harmless but the ability to
-    * call png_read_update_info() multiple times is new in 1.5.6 so it seems
-    * sensible to warn if the app introduces such a hit.
-    */
-   if (png_ptr->gamma_table != NULL || png_ptr->gamma_16_table != NULL)
-   {
-      png_warning(png_ptr, "gamma table being rebuilt");
-      png_destroy_gamma_table(png_ptr);
-   }
-
-   if (bit_depth <= 8)
-   {
-      png_build_8bit_table(png_ptr, &png_ptr->gamma_table,
-          png_ptr->screen_gamma > 0 ?
-          png_reciprocal2(png_ptr->colorspace.gamma,
-          png_ptr->screen_gamma) : PNG_FP_1);
-
-#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
-   defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
-   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-      if ((png_ptr->transformations & (PNG_COMPOSE | PNG_RGB_TO_GRAY)) != 0)
-      {
-         png_build_8bit_table(png_ptr, &png_ptr->gamma_to_1,
-             png_reciprocal(png_ptr->colorspace.gamma));
-
-         png_build_8bit_table(png_ptr, &png_ptr->gamma_from_1,
-             png_ptr->screen_gamma > 0 ?
-             png_reciprocal(png_ptr->screen_gamma) :
-             png_ptr->colorspace.gamma/* Probably doing rgb_to_gray */);
-      }
-#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
-   }
-#ifdef PNG_16BIT_SUPPORTED
-   else
-   {
-      png_byte shift, sig_bit;
-
-      if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
-      {
-         sig_bit = png_ptr->sig_bit.red;
-
-         if (png_ptr->sig_bit.green > sig_bit)
-            sig_bit = png_ptr->sig_bit.green;
-
-         if (png_ptr->sig_bit.blue > sig_bit)
-            sig_bit = png_ptr->sig_bit.blue;
-      }
-      else
-         sig_bit = png_ptr->sig_bit.gray;
-
-      /* 16-bit gamma code uses this equation:
-       *
-       *   ov = table[(iv & 0xff) >> gamma_shift][iv >> 8]
-       *
-       * Where 'iv' is the input color value and 'ov' is the output value -
-       * pow(iv, gamma).
-       *
-       * Thus the gamma table consists of up to 256 256-entry tables.  The table
-       * is selected by the (8-gamma_shift) most significant of the low 8 bits
-       * of the color value then indexed by the upper 8 bits:
-       *
-       *   table[low bits][high 8 bits]
-       *
-       * So the table 'n' corresponds to all those 'iv' of:
-       *
-       *   <all high 8-bit values><n << gamma_shift>..<(n+1 << gamma_shift)-1>
-       *
-       */
-      if (sig_bit > 0 && sig_bit < 16U)
-         /* shift == insignificant bits */
-         shift = (png_byte)((16U - sig_bit) & 0xff);
-
-      else
-         shift = 0; /* keep all 16 bits */
-
-      if ((png_ptr->transformations & (PNG_16_TO_8 | PNG_SCALE_16_TO_8)) != 0)
-      {
-         /* PNG_MAX_GAMMA_8 is the number of bits to keep - effectively
-          * the significant bits in the *input* when the output will
-          * eventually be 8 bits.  By default it is 11.
-          */
-         if (shift < (16U - PNG_MAX_GAMMA_8))
-            shift = (16U - PNG_MAX_GAMMA_8);
-      }
-
-      if (shift > 8U)
-         shift = 8U; /* Guarantees at least one table! */
-
-      png_ptr->gamma_shift = shift;
-
-      /* NOTE: prior to 1.5.4 this test used to include PNG_BACKGROUND (now
-       * PNG_COMPOSE).  This effectively smashed the background calculation for
-       * 16-bit output because the 8-bit table assumes the result will be
-       * reduced to 8 bits.
-       */
-      if ((png_ptr->transformations & (PNG_16_TO_8 | PNG_SCALE_16_TO_8)) != 0)
-          png_build_16to8_table(png_ptr, &png_ptr->gamma_16_table, shift,
-          png_ptr->screen_gamma > 0 ? png_product2(png_ptr->colorspace.gamma,
-          png_ptr->screen_gamma) : PNG_FP_1);
-
-      else
-          png_build_16bit_table(png_ptr, &png_ptr->gamma_16_table, shift,
-          png_ptr->screen_gamma > 0 ? png_reciprocal2(png_ptr->colorspace.gamma,
-          png_ptr->screen_gamma) : PNG_FP_1);
-
-#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
-   defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
-   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-      if ((png_ptr->transformations & (PNG_COMPOSE | PNG_RGB_TO_GRAY)) != 0)
-      {
-         png_build_16bit_table(png_ptr, &png_ptr->gamma_16_to_1, shift,
-             png_reciprocal(png_ptr->colorspace.gamma));
-
-         /* Notice that the '16 from 1' table should be full precision, however
-          * the lookup on this table still uses gamma_shift, so it can't be.
-          * TODO: fix this.
-          */
-         png_build_16bit_table(png_ptr, &png_ptr->gamma_16_from_1, shift,
-             png_ptr->screen_gamma > 0 ? png_reciprocal(png_ptr->screen_gamma) :
-             png_ptr->colorspace.gamma/* Probably doing rgb_to_gray */);
-      }
-#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
-   }
-#endif /* 16BIT */
-}
-#endif /* READ_GAMMA */
-
-/* HARDWARE OR SOFTWARE OPTION SUPPORT */
-#ifdef PNG_SET_OPTION_SUPPORTED
-int PNGAPI
-png_set_option(png_structrp png_ptr, int option, int onoff)
-{
-   if (png_ptr != NULL && option >= 0 && option < PNG_OPTION_NEXT &&
-      (option & 1) == 0)
-   {
-      png_uint_32 mask = 3U << option;
-      png_uint_32 setting = (2U + (onoff != 0)) << option;
-      png_uint_32 current = png_ptr->options;
-
-      png_ptr->options = (png_uint_32)(((current & ~mask) | setting) & 0xff);
-
-      return (int)(current & mask) >> option;
-   }
-
-   return PNG_OPTION_INVALID;
-}
-#endif
-
-/* sRGB support */
-#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
-   defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
-/* sRGB conversion tables; these are machine generated with the code in
- * contrib/tools/makesRGB.c.  The actual sRGB transfer curve defined in the
- * specification (see the article at https://en.wikipedia.org/wiki/SRGB)
- * is used, not the gamma=1/2.2 approximation use elsewhere in libpng.
- * The sRGB to linear table is exact (to the nearest 16-bit linear fraction).
- * The inverse (linear to sRGB) table has accuracies as follows:
- *
- * For all possible (255*65535+1) input values:
- *
- *    error: -0.515566 - 0.625971, 79441 (0.475369%) of readings inexact
- *
- * For the input values corresponding to the 65536 16-bit values:
- *
- *    error: -0.513727 - 0.607759, 308 (0.469978%) of readings inexact
- *
- * In all cases the inexact readings are only off by one.
- */
-
-#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
-/* The convert-to-sRGB table is only currently required for read. */
-const png_uint_16 png_sRGB_table[256] =
-{
-   0,20,40,60,80,99,119,139,
-   159,179,199,219,241,264,288,313,
-   340,367,396,427,458,491,526,562,
-   599,637,677,718,761,805,851,898,
-   947,997,1048,1101,1156,1212,1270,1330,
-   1391,1453,1517,1583,1651,1720,1790,1863,
-   1937,2013,2090,2170,2250,2333,2418,2504,
-   2592,2681,2773,2866,2961,3058,3157,3258,
-   3360,3464,3570,3678,3788,3900,4014,4129,
-   4247,4366,4488,4611,4736,4864,4993,5124,
-   5257,5392,5530,5669,5810,5953,6099,6246,
-   6395,6547,6700,6856,7014,7174,7335,7500,
-   7666,7834,8004,8177,8352,8528,8708,8889,
-   9072,9258,9445,9635,9828,10022,10219,10417,
-   10619,10822,11028,11235,11446,11658,11873,12090,
-   12309,12530,12754,12980,13209,13440,13673,13909,
-   14146,14387,14629,14874,15122,15371,15623,15878,
-   16135,16394,16656,16920,17187,17456,17727,18001,
-   18277,18556,18837,19121,19407,19696,19987,20281,
-   20577,20876,21177,21481,21787,22096,22407,22721,
-   23038,23357,23678,24002,24329,24658,24990,25325,
-   25662,26001,26344,26688,27036,27386,27739,28094,
-   28452,28813,29176,29542,29911,30282,30656,31033,
-   31412,31794,32179,32567,32957,33350,33745,34143,
-   34544,34948,35355,35764,36176,36591,37008,37429,
-   37852,38278,38706,39138,39572,40009,40449,40891,
-   41337,41785,42236,42690,43147,43606,44069,44534,
-   45002,45473,45947,46423,46903,47385,47871,48359,
-   48850,49344,49841,50341,50844,51349,51858,52369,
-   52884,53401,53921,54445,54971,55500,56032,56567,
-   57105,57646,58190,58737,59287,59840,60396,60955,
-   61517,62082,62650,63221,63795,64372,64952,65535
-};
-#endif /* SIMPLIFIED_READ */
-
-/* The base/delta tables are required for both read and write (but currently
- * only the simplified versions.)
- */
-const png_uint_16 png_sRGB_base[512] =
-{
-   128,1782,3383,4644,5675,6564,7357,8074,
-   8732,9346,9921,10463,10977,11466,11935,12384,
-   12816,13233,13634,14024,14402,14769,15125,15473,
-   15812,16142,16466,16781,17090,17393,17690,17981,
-   18266,18546,18822,19093,19359,19621,19879,20133,
-   20383,20630,20873,21113,21349,21583,21813,22041,
-   22265,22487,22707,22923,23138,23350,23559,23767,
-   23972,24175,24376,24575,24772,24967,25160,25352,
-   25542,25730,25916,26101,26284,26465,26645,26823,
-   27000,27176,27350,27523,27695,27865,28034,28201,
-   28368,28533,28697,28860,29021,29182,29341,29500,
-   29657,29813,29969,30123,30276,30429,30580,30730,
-   30880,31028,31176,31323,31469,31614,31758,31902,
-   32045,32186,32327,32468,32607,32746,32884,33021,
-   33158,33294,33429,33564,33697,33831,33963,34095,
-   34226,34357,34486,34616,34744,34873,35000,35127,
-   35253,35379,35504,35629,35753,35876,35999,36122,
-   36244,36365,36486,36606,36726,36845,36964,37083,
-   37201,37318,37435,37551,37668,37783,37898,38013,
-   38127,38241,38354,38467,38580,38692,38803,38915,
-   39026,39136,39246,39356,39465,39574,39682,39790,
-   39898,40005,40112,40219,40325,40431,40537,40642,
-   40747,40851,40955,41059,41163,41266,41369,41471,
-   41573,41675,41777,41878,41979,42079,42179,42279,
-   42379,42478,42577,42676,42775,42873,42971,43068,
-   43165,43262,43359,43456,43552,43648,43743,43839,
-   43934,44028,44123,44217,44311,44405,44499,44592,
-   44685,44778,44870,44962,45054,45146,45238,45329,
-   45420,45511,45601,45692,45782,45872,45961,46051,
-   46140,46229,46318,46406,46494,46583,46670,46758,
-   46846,46933,47020,47107,47193,47280,47366,47452,
-   47538,47623,47709,47794,47879,47964,48048,48133,
-   48217,48301,48385,48468,48552,48635,48718,48801,
-   48884,48966,49048,49131,49213,49294,49376,49458,
-   49539,49620,49701,49782,49862,49943,50023,50103,
-   50183,50263,50342,50422,50501,50580,50659,50738,
-   50816,50895,50973,51051,51129,51207,51285,51362,
-   51439,51517,51594,51671,51747,51824,51900,51977,
-   52053,52129,52205,52280,52356,52432,52507,52582,
-   52657,52732,52807,52881,52956,53030,53104,53178,
-   53252,53326,53400,53473,53546,53620,53693,53766,
-   53839,53911,53984,54056,54129,54201,54273,54345,
-   54417,54489,54560,54632,54703,54774,54845,54916,
-   54987,55058,55129,55199,55269,55340,55410,55480,
-   55550,55620,55689,55759,55828,55898,55967,56036,
-   56105,56174,56243,56311,56380,56448,56517,56585,
-   56653,56721,56789,56857,56924,56992,57059,57127,
-   57194,57261,57328,57395,57462,57529,57595,57662,
-   57728,57795,57861,57927,57993,58059,58125,58191,
-   58256,58322,58387,58453,58518,58583,58648,58713,
-   58778,58843,58908,58972,59037,59101,59165,59230,
-   59294,59358,59422,59486,59549,59613,59677,59740,
-   59804,59867,59930,59993,60056,60119,60182,60245,
-   60308,60370,60433,60495,60558,60620,60682,60744,
-   60806,60868,60930,60992,61054,61115,61177,61238,
-   61300,61361,61422,61483,61544,61605,61666,61727,
-   61788,61848,61909,61969,62030,62090,62150,62211,
-   62271,62331,62391,62450,62510,62570,62630,62689,
-   62749,62808,62867,62927,62986,63045,63104,63163,
-   63222,63281,63340,63398,63457,63515,63574,63632,
-   63691,63749,63807,63865,63923,63981,64039,64097,
-   64155,64212,64270,64328,64385,64443,64500,64557,
-   64614,64672,64729,64786,64843,64900,64956,65013,
-   65070,65126,65183,65239,65296,65352,65409,65465
-};
-
-const png_byte png_sRGB_delta[512] =
-{
-   207,201,158,129,113,100,90,82,77,72,68,64,61,59,56,54,
-   52,50,49,47,46,45,43,42,41,40,39,39,38,37,36,36,
-   35,34,34,33,33,32,32,31,31,30,30,30,29,29,28,28,
-   28,27,27,27,27,26,26,26,25,25,25,25,24,24,24,24,
-   23,23,23,23,23,22,22,22,22,22,22,21,21,21,21,21,
-   21,20,20,20,20,20,20,20,20,19,19,19,19,19,19,19,
-   19,18,18,18,18,18,18,18,18,18,18,17,17,17,17,17,
-   17,17,17,17,17,17,16,16,16,16,16,16,16,16,16,16,
-   16,16,16,16,15,15,15,15,15,15,15,15,15,15,15,15,
-   15,15,15,15,14,14,14,14,14,14,14,14,14,14,14,14,
-   14,14,14,14,14,14,14,13,13,13,13,13,13,13,13,13,
-   13,13,13,13,13,13,13,13,13,13,13,13,13,13,12,12,
-   12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,
-   12,12,12,12,12,12,12,12,12,12,12,12,11,11,11,11,
-   11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,
-   11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,
-   11,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,
-   10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,
-   10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,
-   10,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
-   9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
-   9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
-   9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
-   9,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
-   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
-   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
-   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
-   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
-   8,8,8,8,8,8,8,8,8,7,7,7,7,7,7,7,
-   7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
-   7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
-   7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
-};
-#endif /* SIMPLIFIED READ/WRITE sRGB support */
-
-/* SIMPLIFIED READ/WRITE SUPPORT */
-#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
-   defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
-static int
-png_image_free_function(png_voidp argument)
-{
-   png_imagep image = png_voidcast(png_imagep, argument);
-   png_controlp cp = image->opaque;
-   png_control c;
-
-   /* Double check that we have a png_ptr - it should be impossible to get here
-    * without one.
-    */
-   if (cp->png_ptr == NULL)
-      return 0;
-
-   /* First free any data held in the control structure. */
-#  ifdef PNG_STDIO_SUPPORTED
-      if (cp->owned_file != 0)
-      {
-         FILE *fp = png_voidcast(FILE*, cp->png_ptr->io_ptr);
-         cp->owned_file = 0;
-
-         /* Ignore errors here. */
-         if (fp != NULL)
-         {
-            cp->png_ptr->io_ptr = NULL;
-            (void)fclose(fp);
-         }
-      }
-#  endif
-
-   /* Copy the control structure so that the original, allocated, version can be
-    * safely freed.  Notice that a png_error here stops the remainder of the
-    * cleanup, but this is probably fine because that would indicate bad memory
-    * problems anyway.
-    */
-   c = *cp;
-   image->opaque = &c;
-   png_free(c.png_ptr, cp);
-
-   /* Then the structures, calling the correct API. */
-   if (c.for_write != 0)
-   {
-#     ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED
-         png_destroy_write_struct(&c.png_ptr, &c.info_ptr);
-#     else
-         png_error(c.png_ptr, "simplified write not supported");
-#     endif
-   }
-   else
-   {
-#     ifdef PNG_SIMPLIFIED_READ_SUPPORTED
-         png_destroy_read_struct(&c.png_ptr, &c.info_ptr, NULL);
-#     else
-         png_error(c.png_ptr, "simplified read not supported");
-#     endif
-   }
-
-   /* Success. */
-   return 1;
-}
-
-void PNGAPI
-png_image_free(png_imagep image)
-{
-   /* Safely call the real function, but only if doing so is safe at this point
-    * (if not inside an error handling context).  Otherwise assume
-    * png_safe_execute will call this API after the return.
-    */
-   if (image != NULL && image->opaque != NULL &&
-      image->opaque->error_buf == NULL)
-   {
-      /* Ignore errors here: */
-      (void)png_safe_execute(image, png_image_free_function, image);
-      image->opaque = NULL;
-   }
-}
-
-int /* PRIVATE */
-png_image_error(png_imagep image, png_const_charp error_message)
-{
-   /* Utility to log an error. */
-   png_safecat(image->message, (sizeof image->message), 0, error_message);
-   image->warning_or_error |= PNG_IMAGE_ERROR;
-   png_image_free(image);
-   return 0;
-}
-
-#endif /* SIMPLIFIED READ/WRITE */
-#endif /* READ || WRITE */
diff --git a/src/png/libpng/png.h b/src/png/libpng/png.h
deleted file mode 100644
index 4c873f5c2..000000000
--- a/src/png/libpng/png.h
+++ /dev/null
@@ -1,3278 +0,0 @@
-
-/* png.h - header file for PNG reference library
- *
- * libpng version 1.6.34, September 29, 2017
- *
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license (See LICENSE, below)
- *
- * Authors and maintainers:
- *   libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
- *   libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger
- *   libpng versions 0.97, January 1998, through 1.6.34, September 29, 2017:
- *     Glenn Randers-Pehrson.
- *   See also "Contributing Authors", below.
- */
-
-/*
- * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
- *
- * If you modify libpng you may insert additional notices immediately following
- * this sentence.
- *
- * This code is released under the libpng license.
- *
- * libpng versions 1.0.7, July 1, 2000 through 1.6.34, September 29, 2017 are
- * Copyright (c) 2000-2002, 2004, 2006-2017 Glenn Randers-Pehrson, are
- * derived from libpng-1.0.6, and are distributed according to the same
- * disclaimer and license as libpng-1.0.6 with the following individuals
- * added to the list of Contributing Authors:
- *
- *    Simon-Pierre Cadieux
- *    Eric S. Raymond
- *    Mans Rullgard
- *    Cosmin Truta
- *    Gilles Vollant
- *    James Yu
- *    Mandar Sahastrabuddhe
- *    Google Inc.
- *    Vadim Barkov
- *
- * and with the following additions to the disclaimer:
- *
- *    There is no warranty against interference with your enjoyment of the
- *    library or against infringement.  There is no warranty that our
- *    efforts or the library will fulfill any of your particular purposes
- *    or needs.  This library is provided with all faults, and the entire
- *    risk of satisfactory quality, performance, accuracy, and effort is with
- *    the user.
- *
- * Some files in the "contrib" directory and some configure-generated
- * files that are distributed with libpng have other copyright owners and
- * are released under other open source licenses.
- *
- * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
- * Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
- * libpng-0.96, and are distributed according to the same disclaimer and
- * license as libpng-0.96, with the following individuals added to the list
- * of Contributing Authors:
- *
- *    Tom Lane
- *    Glenn Randers-Pehrson
- *    Willem van Schaik
- *
- * libpng versions 0.89, June 1996, through 0.96, May 1997, are
- * Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88,
- * and are distributed according to the same disclaimer and license as
- * libpng-0.88, with the following individuals added to the list of
- * Contributing Authors:
- *
- *    John Bowler
- *    Kevin Bracey
- *    Sam Bushell
- *    Magnus Holmgren
- *    Greg Roelofs
- *    Tom Tanner
- *
- * Some files in the "scripts" directory have other copyright owners
- * but are released under this license.
- *
- * libpng versions 0.5, May 1995, through 0.88, January 1996, are
- * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
- *
- * For the purposes of this copyright and license, "Contributing Authors"
- * is defined as the following set of individuals:
- *
- *    Andreas Dilger
- *    Dave Martindale
- *    Guy Eric Schalnat
- *    Paul Schmidt
- *    Tim Wegner
- *
- * The PNG Reference Library is supplied "AS IS".  The Contributing Authors
- * and Group 42, Inc. disclaim all warranties, expressed or implied,
- * including, without limitation, the warranties of merchantability and of
- * fitness for any purpose.  The Contributing Authors and Group 42, Inc.
- * assume no liability for direct, indirect, incidental, special, exemplary,
- * or consequential damages, which may result from the use of the PNG
- * Reference Library, even if advised of the possibility of such damage.
- *
- * Permission is hereby granted to use, copy, modify, and distribute this
- * source code, or portions hereof, for any purpose, without fee, subject
- * to the following restrictions:
- *
- *   1. The origin of this source code must not be misrepresented.
- *
- *   2. Altered versions must be plainly marked as such and must not
- *      be misrepresented as being the original source.
- *
- *   3. This Copyright notice may not be removed or altered from any
- *      source or altered source distribution.
- *
- * The Contributing Authors and Group 42, Inc. specifically permit, without
- * fee, and encourage the use of this source code as a component to
- * supporting the PNG file format in commercial products.  If you use this
- * source code in a product, acknowledgment is not required but would be
- * appreciated.
- *
- * END OF COPYRIGHT NOTICE, DISCLAIMER, and LICENSE.
- *
- * TRADEMARK:
- *
- * The name "libpng" has not been registered by the Copyright owner
- * as a trademark in any jurisdiction.  However, because libpng has
- * been distributed and maintained world-wide, continually since 1995,
- * the Copyright owner claims "common-law trademark protection" in any
- * jurisdiction where common-law trademark is recognized.
- *
- * OSI CERTIFICATION:
- *
- * Libpng is OSI Certified Open Source Software.  OSI Certified Open Source is
- * a certification mark of the Open Source Initiative. OSI has not addressed
- * the additional disclaimers inserted at version 1.0.7.
- *
- * EXPORT CONTROL:
- *
- * The Copyright owner believes that the Export Control Classification
- * Number (ECCN) for libpng is EAR99, which means not subject to export
- * controls or International Traffic in Arms Regulations (ITAR) because
- * it is open source, publicly available software, that does not contain
- * any encryption software.  See the EAR, paragraphs 734.3(b)(3) and
- * 734.7(b).
- */
-
-/*
- * A "png_get_copyright" function is available, for convenient use in "about"
- * boxes and the like:
- *
- *    printf("%s", png_get_copyright(NULL));
- *
- * Also, the PNG logo (in PNG format, of course) is supplied in the
- * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
- */
-
-/*
- * The contributing authors would like to thank all those who helped
- * with testing, bug fixes, and patience.  This wouldn't have been
- * possible without all of you.
- *
- * Thanks to Frank J. T. Wojcik for helping with the documentation.
- */
-
-/* Note about libpng version numbers:
- *
- *    Due to various miscommunications, unforeseen code incompatibilities
- *    and occasional factors outside the authors' control, version numbering
- *    on the library has not always been consistent and straightforward.
- *    The following table summarizes matters since version 0.89c, which was
- *    the first widely used release:
- *
- *    source                 png.h  png.h  shared-lib
- *    version                string   int  version
- *    -------                ------ -----  ----------
- *    0.89c "1.0 beta 3"     0.89      89  1.0.89
- *    0.90  "1.0 beta 4"     0.90      90  0.90  [should have been 2.0.90]
- *    0.95  "1.0 beta 5"     0.95      95  0.95  [should have been 2.0.95]
- *    0.96  "1.0 beta 6"     0.96      96  0.96  [should have been 2.0.96]
- *    0.97b "1.00.97 beta 7" 1.00.97   97  1.0.1 [should have been 2.0.97]
- *    0.97c                  0.97      97  2.0.97
- *    0.98                   0.98      98  2.0.98
- *    0.99                   0.99      98  2.0.99
- *    0.99a-m                0.99      99  2.0.99
- *    1.00                   1.00     100  2.1.0 [100 should be 10000]
- *    1.0.0      (from here on, the   100  2.1.0 [100 should be 10000]
- *    1.0.1       png.h string is   10001  2.1.0
- *    1.0.1a-e    identical to the  10002  from here on, the shared library
- *    1.0.2       source version)   10002  is 2.V where V is the source code
- *    1.0.2a-b                      10003  version, except as noted.
- *    1.0.3                         10003
- *    1.0.3a-d                      10004
- *    1.0.4                         10004
- *    1.0.4a-f                      10005
- *    1.0.5 (+ 2 patches)           10005
- *    1.0.5a-d                      10006
- *    1.0.5e-r                      10100 (not source compatible)
- *    1.0.5s-v                      10006 (not binary compatible)
- *    1.0.6 (+ 3 patches)           10006 (still binary incompatible)
- *    1.0.6d-f                      10007 (still binary incompatible)
- *    1.0.6g                        10007
- *    1.0.6h                        10007  10.6h (testing xy.z so-numbering)
- *    1.0.6i                        10007  10.6i
- *    1.0.6j                        10007  2.1.0.6j (incompatible with 1.0.0)
- *    1.0.7beta11-14        DLLNUM  10007  2.1.0.7beta11-14 (binary compatible)
- *    1.0.7beta15-18           1    10007  2.1.0.7beta15-18 (binary compatible)
- *    1.0.7rc1-2               1    10007  2.1.0.7rc1-2 (binary compatible)
- *    1.0.7                    1    10007  (still compatible)
- *    ...
- *    1.0.19                  10    10019  10.so.0.19[.0]
- *    ...
- *    1.2.59                  13    10257  12.so.0.59[.0]
- *    ...
- *    1.5.30                  15    10527  15.so.15.30[.0]
- *    ...
- *    1.6.34                  16    10633  16.so.16.34[.0]
- *
- *    Henceforth the source version will match the shared-library major
- *    and minor numbers; the shared-library major version number will be
- *    used for changes in backward compatibility, as it is intended.  The
- *    PNG_LIBPNG_VER macro, which is not used within libpng but is available
- *    for applications, is an unsigned integer of the form xyyzz corresponding
- *    to the source version x.y.z (leading zeros in y and z).  Beta versions
- *    were given the previous public release number plus a letter, until
- *    version 1.0.6j; from then on they were given the upcoming public
- *    release number plus "betaNN" or "rcNN".
- *
- *    Binary incompatibility exists only when applications make direct access
- *    to the info_ptr or png_ptr members through png.h, and the compiled
- *    application is loaded with a different version of the library.
- *
- *    DLLNUM will change each time there are forward or backward changes
- *    in binary compatibility (e.g., when a new feature is added).
- *
- * See libpng.txt or libpng.3 for more information.  The PNG specification
- * is available as a W3C Recommendation and as an ISO Specification,
- * <https://www.w3.org/TR/2003/REC-PNG-20031110/
- */
-
-/*
- * Y2K compliance in libpng:
- * =========================
- *
- *    September 29, 2017
- *
- *    Since the PNG Development group is an ad-hoc body, we can't make
- *    an official declaration.
- *
- *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.6.34 are Y2K compliant.  It is my belief that
- *    earlier versions were also Y2K compliant.
- *
- *    Libpng only has two year fields.  One is a 2-byte unsigned integer
- *    that will hold years up to 65535.  The other, which is deprecated,
- *    holds the date in text format, and will hold years up to 9999.
- *
- *    The integer is
- *        "png_uint_16 year" in png_time_struct.
- *
- *    The string is
- *        "char time_buffer[29]" in png_struct.  This is no longer used
- *    in libpng-1.6.x and will be removed from libpng-1.7.0.
- *
- *    There are seven time-related functions:
- *        png.c: png_convert_to_rfc_1123_buffer() in png.c
- *          (formerly png_convert_to_rfc_1123() prior to libpng-1.5.x and
- *          png_convert_to_rfc_1152() in error prior to libpng-0.98)
- *        png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
- *        png_convert_from_time_t() in pngwrite.c
- *        png_get_tIME() in pngget.c
- *        png_handle_tIME() in pngrutil.c, called in pngread.c
- *        png_set_tIME() in pngset.c
- *        png_write_tIME() in pngwutil.c, called in pngwrite.c
- *
- *    All handle dates properly in a Y2K environment.  The
- *    png_convert_from_time_t() function calls gmtime() to convert from system
- *    clock time, which returns (year - 1900), which we properly convert to
- *    the full 4-digit year.  There is a possibility that libpng applications
- *    are not passing 4-digit years into the png_convert_to_rfc_1123_buffer()
- *    function, or that they are incorrectly passing only a 2-digit year
- *    instead of "year - 1900" into the png_convert_from_struct_tm() function,
- *    but this is not under our control.  The libpng documentation has always
- *    stated that it works with 4-digit years, and the APIs have been
- *    documented as such.
- *
- *    The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
- *    integer to hold the year, and can hold years as large as 65535.
- *
- *    zlib, upon which libpng depends, is also Y2K compliant.  It contains
- *    no date-related code.
- *
- *       Glenn Randers-Pehrson
- *       libpng maintainer
- *       PNG Development Group
- */
-
-#ifndef PNG_H
-#define PNG_H
-
-/* This is not the place to learn how to use libpng. The file libpng-manual.txt
- * describes how to use libpng, and the file example.c summarizes it
- * with some code on which to build.  This file is useful for looking
- * at the actual function definitions and structure components.  If that
- * file has been stripped from your copy of libpng, you can find it at
- * <http://www.libpng.org/pub/png/libpng-manual.txt>
- *
- * If you just need to read a PNG file and don't want to read the documentation
- * skip to the end of this file and read the section entitled 'simplified API'.
- */
-
-/* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.6.34"
-#define PNG_HEADER_VERSION_STRING " libpng version 1.6.34 - September 29, 2017\n"
-
-#define PNG_LIBPNG_VER_SONUM   16
-#define PNG_LIBPNG_VER_DLLNUM  16
-
-/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
-#define PNG_LIBPNG_VER_MAJOR   1
-#define PNG_LIBPNG_VER_MINOR   6
-#define PNG_LIBPNG_VER_RELEASE 34
-
-/* This should match the numeric part of the final component of
- * PNG_LIBPNG_VER_STRING, omitting any leading zero:
- */
-
-#define PNG_LIBPNG_VER_BUILD  0
-
-/* Release Status */
-#define PNG_LIBPNG_BUILD_ALPHA    1
-#define PNG_LIBPNG_BUILD_BETA     2
-#define PNG_LIBPNG_BUILD_RC       3
-#define PNG_LIBPNG_BUILD_STABLE   4
-#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
-
-/* Release-Specific Flags */
-#define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with
-                                       PNG_LIBPNG_BUILD_STABLE only */
-#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
-                                       PNG_LIBPNG_BUILD_SPECIAL */
-#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
-                                       PNG_LIBPNG_BUILD_PRIVATE */
-
-#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
-
-/* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
- * We must not include leading zeros.
- * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
- * version 1.0.0 was mis-numbered 100 instead of 10000).  From
- * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
- */
-#define PNG_LIBPNG_VER 10634 /* 1.6.34 */
-
-/* Library configuration: these options cannot be changed after
- * the library has been built.
- */
-#ifndef PNGLCONF_H
-/* If pnglibconf.h is missing, you can
- * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h
- */
-#   include "pnglibconf.h"
-#endif
-
-#ifndef PNG_VERSION_INFO_ONLY
-/* Machine specific configuration. */
-#  include "pngconf.h"
-#endif
-
-/*
- * Added at libpng-1.2.8
- *
- * Ref MSDN: Private as priority over Special
- * VS_FF_PRIVATEBUILD File *was not* built using standard release
- * procedures. If this value is given, the StringFileInfo block must
- * contain a PrivateBuild string.
- *
- * VS_FF_SPECIALBUILD File *was* built by the original company using
- * standard release procedures but is a variation of the standard
- * file of the same version number. If this value is given, the
- * StringFileInfo block must contain a SpecialBuild string.
- */
-
-#ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */
-#  define PNG_LIBPNG_BUILD_TYPE \
-       (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
-#else
-#  ifdef PNG_LIBPNG_SPECIALBUILD
-#    define PNG_LIBPNG_BUILD_TYPE \
-         (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
-#  else
-#    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
-#  endif
-#endif
-
-#ifndef PNG_VERSION_INFO_ONLY
-
-/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-/* Version information for C files, stored in png.c.  This had better match
- * the version above.
- */
-#define png_libpng_ver png_get_header_ver(NULL)
-
-/* This file is arranged in several sections:
- *
- * 1. [omitted]
- * 2. Any configuration options that can be specified by for the application
- *    code when it is built.  (Build time configuration is in pnglibconf.h)
- * 3. Type definitions (base types are defined in pngconf.h), structure
- *    definitions.
- * 4. Exported library functions.
- * 5. Simplified API.
- * 6. Implementation options.
- *
- * The library source code has additional files (principally pngpriv.h) that
- * allow configuration of the library.
- */
-
-/* Section 1: [omitted] */
-
-/* Section 2: run time configuration
- * See pnglibconf.h for build time configuration
- *
- * Run time configuration allows the application to choose between
- * implementations of certain arithmetic APIs.  The default is set
- * at build time and recorded in pnglibconf.h, but it is safe to
- * override these (and only these) settings.  Note that this won't
- * change what the library does, only application code, and the
- * settings can (and probably should) be made on a per-file basis
- * by setting the #defines before including png.h
- *
- * Use macros to read integers from PNG data or use the exported
- * functions?
- *   PNG_USE_READ_MACROS: use the macros (see below)  Note that
- *     the macros evaluate their argument multiple times.
- *   PNG_NO_USE_READ_MACROS: call the relevant library function.
- *
- * Use the alternative algorithm for compositing alpha samples that
- * does not use division?
- *   PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division'
- *      algorithm.
- *   PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm.
- *
- * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is
- * false?
- *   PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error
- *      APIs to png_warning.
- * Otherwise the calls are mapped to png_error.
- */
-
-/* Section 3: type definitions, including structures and compile time
- * constants.
- * See pngconf.h for base types that vary by machine/system
- */
-
-/* This triggers a compiler error in png.c, if png.c and png.h
- * do not agree upon the version number.
- */
-typedef char* png_libpng_version_1_6_34;
-
-/* Basic control structions.  Read libpng-manual.txt or libpng.3 for more info.
- *
- * png_struct is the cache of information used while reading or writing a single
- * PNG file.  One of these is always required, although the simplified API
- * (below) hides the creation and destruction of it.
- */
-typedef struct png_struct_def png_struct;
-typedef const png_struct * png_const_structp;
-typedef png_struct * png_structp;
-typedef png_struct * * png_structpp;
-
-/* png_info contains information read from or to be written to a PNG file.  One
- * or more of these must exist while reading or creating a PNG file.  The
- * information is not used by libpng during read but is used to control what
- * gets written when a PNG file is created.  "png_get_" function calls read
- * information during read and "png_set_" functions calls write information
- * when creating a PNG.
- * been moved into a separate header file that is not accessible to
- * applications.  Read libpng-manual.txt or libpng.3 for more info.
- */
-typedef struct png_info_def png_info;
-typedef png_info * png_infop;
-typedef const png_info * png_const_infop;
-typedef png_info * * png_infopp;
-
-/* Types with names ending 'p' are pointer types.  The corresponding types with
- * names ending 'rp' are identical pointer types except that the pointer is
- * marked 'restrict', which means that it is the only pointer to the object
- * passed to the function.  Applications should not use the 'restrict' types;
- * it is always valid to pass 'p' to a pointer with a function argument of the
- * corresponding 'rp' type.  Different compilers have different rules with
- * regard to type matching in the presence of 'restrict'.  For backward
- * compatibility libpng callbacks never have 'restrict' in their parameters and,
- * consequentially, writing portable application code is extremely difficult if
- * an attempt is made to use 'restrict'.
- */
-typedef png_struct * PNG_RESTRICT png_structrp;
-typedef const png_struct * PNG_RESTRICT png_const_structrp;
-typedef png_info * PNG_RESTRICT png_inforp;
-typedef const png_info * PNG_RESTRICT png_const_inforp;
-
-/* Three color definitions.  The order of the red, green, and blue, (and the
- * exact size) is not important, although the size of the fields need to
- * be png_byte or png_uint_16 (as defined below).
- */
-typedef struct png_color_struct
-{
-   png_byte red;
-   png_byte green;
-   png_byte blue;
-} png_color;
-typedef png_color * png_colorp;
-typedef const png_color * png_const_colorp;
-typedef png_color * * png_colorpp;
-
-typedef struct png_color_16_struct
-{
-   png_byte index;    /* used for palette files */
-   png_uint_16 red;   /* for use in red green blue files */
-   png_uint_16 green;
-   png_uint_16 blue;
-   png_uint_16 gray;  /* for use in grayscale files */
-} png_color_16;
-typedef png_color_16 * png_color_16p;
-typedef const png_color_16 * png_const_color_16p;
-typedef png_color_16 * * png_color_16pp;
-
-typedef struct png_color_8_struct
-{
-   png_byte red;   /* for use in red green blue files */
-   png_byte green;
-   png_byte blue;
-   png_byte gray;  /* for use in grayscale files */
-   png_byte alpha; /* for alpha channel files */
-} png_color_8;
-typedef png_color_8 * png_color_8p;
-typedef const png_color_8 * png_const_color_8p;
-typedef png_color_8 * * png_color_8pp;
-
-/*
- * The following two structures are used for the in-core representation
- * of sPLT chunks.
- */
-typedef struct png_sPLT_entry_struct
-{
-   png_uint_16 red;
-   png_uint_16 green;
-   png_uint_16 blue;
-   png_uint_16 alpha;
-   png_uint_16 frequency;
-} png_sPLT_entry;
-typedef png_sPLT_entry * png_sPLT_entryp;
-typedef const png_sPLT_entry * png_const_sPLT_entryp;
-typedef png_sPLT_entry * * png_sPLT_entrypp;
-
-/*  When the depth of the sPLT palette is 8 bits, the color and alpha samples
- *  occupy the LSB of their respective members, and the MSB of each member
- *  is zero-filled.  The frequency member always occupies the full 16 bits.
- */
-
-typedef struct png_sPLT_struct
-{
-   png_charp name;           /* palette name */
-   png_byte depth;           /* depth of palette samples */
-   png_sPLT_entryp entries;  /* palette entries */
-   png_int_32 nentries;      /* number of palette entries */
-} png_sPLT_t;
-typedef png_sPLT_t * png_sPLT_tp;
-typedef const png_sPLT_t * png_const_sPLT_tp;
-typedef png_sPLT_t * * png_sPLT_tpp;
-
-#ifdef PNG_TEXT_SUPPORTED
-/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
- * and whether that contents is compressed or not.  The "key" field
- * points to a regular zero-terminated C string.  The "text" fields can be a
- * regular C string, an empty string, or a NULL pointer.
- * However, the structure returned by png_get_text() will always contain
- * the "text" field as a regular zero-terminated C string (possibly
- * empty), never a NULL pointer, so it can be safely used in printf() and
- * other string-handling functions.  Note that the "itxt_length", "lang", and
- * "lang_key" members of the structure only exist when the library is built
- * with iTXt chunk support.  Prior to libpng-1.4.0 the library was built by
- * default without iTXt support. Also note that when iTXt *is* supported,
- * the "lang" and "lang_key" fields contain NULL pointers when the
- * "compression" field contains * PNG_TEXT_COMPRESSION_NONE or
- * PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the
- * same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag"
- * which is always 0 or 1, or its "compression method" which is always 0.
- */
-typedef struct png_text_struct
-{
-   int  compression;       /* compression value:
-                             -1: tEXt, none
-                              0: zTXt, deflate
-                              1: iTXt, none
-                              2: iTXt, deflate  */
-   png_charp key;          /* keyword, 1-79 character description of "text" */
-   png_charp text;         /* comment, may be an empty string (ie "")
-                              or a NULL pointer */
-   png_size_t text_length; /* length of the text string */
-   png_size_t itxt_length; /* length of the itxt string */
-   png_charp lang;         /* language code, 0-79 characters
-                              or a NULL pointer */
-   png_charp lang_key;     /* keyword translated UTF-8 string, 0 or more
-                              chars or a NULL pointer */
-} png_text;
-typedef png_text * png_textp;
-typedef const png_text * png_const_textp;
-typedef png_text * * png_textpp;
-#endif
-
-/* Supported compression types for text in PNG files (tEXt, and zTXt).
- * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
-#define PNG_TEXT_COMPRESSION_NONE_WR -3
-#define PNG_TEXT_COMPRESSION_zTXt_WR -2
-#define PNG_TEXT_COMPRESSION_NONE    -1
-#define PNG_TEXT_COMPRESSION_zTXt     0
-#define PNG_ITXT_COMPRESSION_NONE     1
-#define PNG_ITXT_COMPRESSION_zTXt     2
-#define PNG_TEXT_COMPRESSION_LAST     3  /* Not a valid value */
-
-/* png_time is a way to hold the time in an machine independent way.
- * Two conversions are provided, both from time_t and struct tm.  There
- * is no portable way to convert to either of these structures, as far
- * as I know.  If you know of a portable way, send it to me.  As a side
- * note - PNG has always been Year 2000 compliant!
- */
-typedef struct png_time_struct
-{
-   png_uint_16 year; /* full year, as in, 1995 */
-   png_byte month;   /* month of year, 1 - 12 */
-   png_byte day;     /* day of month, 1 - 31 */
-   png_byte hour;    /* hour of day, 0 - 23 */
-   png_byte minute;  /* minute of hour, 0 - 59 */
-   png_byte second;  /* second of minute, 0 - 60 (for leap seconds) */
-} png_time;
-typedef png_time * png_timep;
-typedef const png_time * png_const_timep;
-typedef png_time * * png_timepp;
-
-#if defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) ||\
-   defined(PNG_USER_CHUNKS_SUPPORTED)
-/* png_unknown_chunk is a structure to hold queued chunks for which there is
- * no specific support.  The idea is that we can use this to queue
- * up private chunks for output even though the library doesn't actually
- * know about their semantics.
- *
- * The data in the structure is set by libpng on read and used on write.
- */
-typedef struct png_unknown_chunk_t
-{
-   png_byte name[5]; /* Textual chunk name with '\0' terminator */
-   png_byte *data;   /* Data, should not be modified on read! */
-   png_size_t size;
-
-   /* On write 'location' must be set using the flag values listed below.
-    * Notice that on read it is set by libpng however the values stored have
-    * more bits set than are listed below.  Always treat the value as a
-    * bitmask.  On write set only one bit - setting multiple bits may cause the
-    * chunk to be written in multiple places.
-    */
-   png_byte location; /* mode of operation at read time */
-}
-png_unknown_chunk;
-
-typedef png_unknown_chunk * png_unknown_chunkp;
-typedef const png_unknown_chunk * png_const_unknown_chunkp;
-typedef png_unknown_chunk * * png_unknown_chunkpp;
-#endif
-
-/* Flag values for the unknown chunk location byte. */
-#define PNG_HAVE_IHDR  0x01
-#define PNG_HAVE_PLTE  0x02
-#define PNG_AFTER_IDAT 0x08
-
-/* Maximum positive integer used in PNG is (2^31)-1 */
-#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
-#define PNG_UINT_32_MAX ((png_uint_32)(-1))
-#define PNG_SIZE_MAX ((png_size_t)(-1))
-
-/* These are constants for fixed point values encoded in the
- * PNG specification manner (x100000)
- */
-#define PNG_FP_1    100000
-#define PNG_FP_HALF  50000
-#define PNG_FP_MAX  ((png_fixed_point)0x7fffffffL)
-#define PNG_FP_MIN  (-PNG_FP_MAX)
-
-/* These describe the color_type field in png_info. */
-/* color type masks */
-#define PNG_COLOR_MASK_PALETTE    1
-#define PNG_COLOR_MASK_COLOR      2
-#define PNG_COLOR_MASK_ALPHA      4
-
-/* color types.  Note that not all combinations are legal */
-#define PNG_COLOR_TYPE_GRAY 0
-#define PNG_COLOR_TYPE_PALETTE  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
-#define PNG_COLOR_TYPE_RGB        (PNG_COLOR_MASK_COLOR)
-#define PNG_COLOR_TYPE_RGB_ALPHA  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
-#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
-/* aliases */
-#define PNG_COLOR_TYPE_RGBA  PNG_COLOR_TYPE_RGB_ALPHA
-#define PNG_COLOR_TYPE_GA  PNG_COLOR_TYPE_GRAY_ALPHA
-
-/* This is for compression type. PNG 1.0-1.2 only define the single type. */
-#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
-#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
-
-/* This is for filter type. PNG 1.0-1.2 only define the single type. */
-#define PNG_FILTER_TYPE_BASE      0 /* Single row per-byte filtering */
-#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
-#define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE
-
-/* These are for the interlacing type.  These values should NOT be changed. */
-#define PNG_INTERLACE_NONE        0 /* Non-interlaced image */
-#define PNG_INTERLACE_ADAM7       1 /* Adam7 interlacing */
-#define PNG_INTERLACE_LAST        2 /* Not a valid value */
-
-/* These are for the oFFs chunk.  These values should NOT be changed. */
-#define PNG_OFFSET_PIXEL          0 /* Offset in pixels */
-#define PNG_OFFSET_MICROMETER     1 /* Offset in micrometers (1/10^6 meter) */
-#define PNG_OFFSET_LAST           2 /* Not a valid value */
-
-/* These are for the pCAL chunk.  These values should NOT be changed. */
-#define PNG_EQUATION_LINEAR       0 /* Linear transformation */
-#define PNG_EQUATION_BASE_E       1 /* Exponential base e transform */
-#define PNG_EQUATION_ARBITRARY    2 /* Arbitrary base exponential transform */
-#define PNG_EQUATION_HYPERBOLIC   3 /* Hyperbolic sine transformation */
-#define PNG_EQUATION_LAST         4 /* Not a valid value */
-
-/* These are for the sCAL chunk.  These values should NOT be changed. */
-#define PNG_SCALE_UNKNOWN         0 /* unknown unit (image scale) */
-#define PNG_SCALE_METER           1 /* meters per pixel */
-#define PNG_SCALE_RADIAN          2 /* radians per pixel */
-#define PNG_SCALE_LAST            3 /* Not a valid value */
-
-/* These are for the pHYs chunk.  These values should NOT be changed. */
-#define PNG_RESOLUTION_UNKNOWN    0 /* pixels/unknown unit (aspect ratio) */
-#define PNG_RESOLUTION_METER      1 /* pixels/meter */
-#define PNG_RESOLUTION_LAST       2 /* Not a valid value */
-
-/* These are for the sRGB chunk.  These values should NOT be changed. */
-#define PNG_sRGB_INTENT_PERCEPTUAL 0
-#define PNG_sRGB_INTENT_RELATIVE   1
-#define PNG_sRGB_INTENT_SATURATION 2
-#define PNG_sRGB_INTENT_ABSOLUTE   3
-#define PNG_sRGB_INTENT_LAST       4 /* Not a valid value */
-
-/* This is for text chunks */
-#define PNG_KEYWORD_MAX_LENGTH     79
-
-/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
-#define PNG_MAX_PALETTE_LENGTH    256
-
-/* These determine if an ancillary chunk's data has been successfully read
- * from the PNG header, or if the application has filled in the corresponding
- * data in the info_struct to be written into the output file.  The values
- * of the PNG_INFO_<chunk> defines should NOT be changed.
- */
-#define PNG_INFO_gAMA 0x0001U
-#define PNG_INFO_sBIT 0x0002U
-#define PNG_INFO_cHRM 0x0004U
-#define PNG_INFO_PLTE 0x0008U
-#define PNG_INFO_tRNS 0x0010U
-#define PNG_INFO_bKGD 0x0020U
-#define PNG_INFO_hIST 0x0040U
-#define PNG_INFO_pHYs 0x0080U
-#define PNG_INFO_oFFs 0x0100U
-#define PNG_INFO_tIME 0x0200U
-#define PNG_INFO_pCAL 0x0400U
-#define PNG_INFO_sRGB 0x0800U  /* GR-P, 0.96a */
-#define PNG_INFO_iCCP 0x1000U  /* ESR, 1.0.6 */
-#define PNG_INFO_sPLT 0x2000U  /* ESR, 1.0.6 */
-#define PNG_INFO_sCAL 0x4000U  /* ESR, 1.0.6 */
-#define PNG_INFO_IDAT 0x8000U  /* ESR, 1.0.6 */
-#define PNG_INFO_eXIf 0x10000U /* GR-P, 1.6.31 */
-
-/* This is used for the transformation routines, as some of them
- * change these values for the row.  It also should enable using
- * the routines for other purposes.
- */
-typedef struct png_row_info_struct
-{
-   png_uint_32 width;    /* width of row */
-   png_size_t rowbytes;  /* number of bytes in row */
-   png_byte color_type;  /* color type of row */
-   png_byte bit_depth;   /* bit depth of row */
-   png_byte channels;    /* number of channels (1, 2, 3, or 4) */
-   png_byte pixel_depth; /* bits per pixel (depth * channels) */
-} png_row_info;
-
-typedef png_row_info * png_row_infop;
-typedef png_row_info * * png_row_infopp;
-
-/* These are the function types for the I/O functions and for the functions
- * that allow the user to override the default I/O functions with his or her
- * own.  The png_error_ptr type should match that of user-supplied warning
- * and error functions, while the png_rw_ptr type should match that of the
- * user read/write data functions.  Note that the 'write' function must not
- * modify the buffer it is passed. The 'read' function, on the other hand, is
- * expected to return the read data in the buffer.
- */
-typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp));
-typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t));
-typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp));
-typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32,
-    int));
-typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32,
-    int));
-
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop));
-typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop));
-
-/* The following callback receives png_uint_32 row_number, int pass for the
- * png_bytep data of the row.  When transforming an interlaced image the
- * row number is the row number within the sub-image of the interlace pass, so
- * the value will increase to the height of the sub-image (not the full image)
- * then reset to 0 for the next pass.
- *
- * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
- * find the output pixel (x,y) given an interlaced sub-image pixel
- * (row,col,pass).  (See below for these macros.)
- */
-typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep,
-    png_uint_32, int));
-#endif
-
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop,
-    png_bytep));
-#endif
-
-#ifdef PNG_USER_CHUNKS_SUPPORTED
-typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp,
-    png_unknown_chunkp));
-#endif
-#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
-/* not used anywhere */
-/* typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); */
-#endif
-
-#ifdef PNG_SETJMP_SUPPORTED
-/* This must match the function definition in <setjmp.h>, and the application
- * must include this before png.h to obtain the definition of jmp_buf.  The
- * function is required to be PNG_NORETURN, but this is not checked.  If the
- * function does return the application will crash via an abort() or similar
- * system level call.
- *
- * If you get a warning here while building the library you may need to make
- * changes to ensure that pnglibconf.h records the calling convention used by
- * your compiler.  This may be very difficult - try using a different compiler
- * to build the library!
- */
-PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef);
-#endif
-
-/* Transform masks for the high-level interface */
-#define PNG_TRANSFORM_IDENTITY       0x0000    /* read and write */
-#define PNG_TRANSFORM_STRIP_16       0x0001    /* read only */
-#define PNG_TRANSFORM_STRIP_ALPHA    0x0002    /* read only */
-#define PNG_TRANSFORM_PACKING        0x0004    /* read and write */
-#define PNG_TRANSFORM_PACKSWAP       0x0008    /* read and write */
-#define PNG_TRANSFORM_EXPAND         0x0010    /* read only */
-#define PNG_TRANSFORM_INVERT_MONO    0x0020    /* read and write */
-#define PNG_TRANSFORM_SHIFT          0x0040    /* read and write */
-#define PNG_TRANSFORM_BGR            0x0080    /* read and write */
-#define PNG_TRANSFORM_SWAP_ALPHA     0x0100    /* read and write */
-#define PNG_TRANSFORM_SWAP_ENDIAN    0x0200    /* read and write */
-#define PNG_TRANSFORM_INVERT_ALPHA   0x0400    /* read and write */
-#define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* write only */
-/* Added to libpng-1.2.34 */
-#define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER
-#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
-/* Added to libpng-1.4.0 */
-#define PNG_TRANSFORM_GRAY_TO_RGB   0x2000      /* read only */
-/* Added to libpng-1.5.4 */
-#define PNG_TRANSFORM_EXPAND_16     0x4000      /* read only */
-#if INT_MAX >= 0x8000 /* else this might break */
-#define PNG_TRANSFORM_SCALE_16      0x8000      /* read only */
-#endif
-
-/* Flags for MNG supported features */
-#define PNG_FLAG_MNG_EMPTY_PLTE     0x01
-#define PNG_FLAG_MNG_FILTER_64      0x04
-#define PNG_ALL_MNG_FEATURES        0x05
-
-/* NOTE: prior to 1.5 these functions had no 'API' style declaration,
- * this allowed the zlib default functions to be used on Windows
- * platforms.  In 1.5 the zlib default malloc (which just calls malloc and
- * ignores the first argument) should be completely compatible with the
- * following.
- */
-typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp,
-    png_alloc_size_t));
-typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp));
-
-/* Section 4: exported functions
- * Here are the function definitions most commonly used.  This is not
- * the place to find out how to use libpng.  See libpng-manual.txt for the
- * full explanation, see example.c for the summary.  This just provides
- * a simple one line description of the use of each function.
- *
- * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in
- * pngconf.h and in the *.dfn files in the scripts directory.
- *
- *   PNG_EXPORT(ordinal, type, name, (args));
- *
- *       ordinal:    ordinal that is used while building
- *                   *.def files. The ordinal value is only
- *                   relevant when preprocessing png.h with
- *                   the *.dfn files for building symbol table
- *                   entries, and are removed by pngconf.h.
- *       type:       return type of the function
- *       name:       function name
- *       args:       function arguments, with types
- *
- * When we wish to append attributes to a function prototype we use
- * the PNG_EXPORTA() macro instead.
- *
- *   PNG_EXPORTA(ordinal, type, name, (args), attributes);
- *
- *       ordinal, type, name, and args: same as in PNG_EXPORT().
- *       attributes: function attributes
- */
-
-/* Returns the version number of the library */
-PNG_EXPORT(1, png_uint_32, png_access_version_number, (void));
-
-/* Tell lib we have already handled the first <num_bytes> magic bytes.
- * Handling more than 8 bytes from the beginning of the file is an error.
- */
-PNG_EXPORT(2, void, png_set_sig_bytes, (png_structrp png_ptr, int num_bytes));
-
-/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
- * PNG file.  Returns zero if the supplied bytes match the 8-byte PNG
- * signature, and non-zero otherwise.  Having num_to_check == 0 or
- * start > 7 will always fail (ie return non-zero).
- */
-PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start,
-    png_size_t num_to_check));
-
-/* Simple signature checking function.  This is the same as calling
- * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
- */
-#define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n))
-
-/* Allocate and initialize png_ptr struct for reading, and any other memory. */
-PNG_EXPORTA(4, png_structp, png_create_read_struct,
-    (png_const_charp user_png_ver, png_voidp error_ptr,
-    png_error_ptr error_fn, png_error_ptr warn_fn),
-    PNG_ALLOCATED);
-
-/* Allocate and initialize png_ptr struct for writing, and any other memory */
-PNG_EXPORTA(5, png_structp, png_create_write_struct,
-    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
-    png_error_ptr warn_fn),
-    PNG_ALLOCATED);
-
-PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size,
-    (png_const_structrp png_ptr));
-
-PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structrp png_ptr,
-    png_size_t size));
-
-/* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp
- * match up.
- */
-#ifdef PNG_SETJMP_SUPPORTED
-/* This function returns the jmp_buf built in to *png_ptr.  It must be
- * supplied with an appropriate 'longjmp' function to use on that jmp_buf
- * unless the default error function is overridden in which case NULL is
- * acceptable.  The size of the jmp_buf is checked against the actual size
- * allocated by the library - the call will return NULL on a mismatch
- * indicating an ABI mismatch.
- */
-PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structrp png_ptr,
-    png_longjmp_ptr longjmp_fn, size_t jmp_buf_size));
-#  define png_jmpbuf(png_ptr) \
-      (*png_set_longjmp_fn((png_ptr), longjmp, (sizeof (jmp_buf))))
-#else
-#  define png_jmpbuf(png_ptr) \
-      (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP)
-#endif
-/* This function should be used by libpng applications in place of
- * longjmp(png_ptr->jmpbuf, val).  If longjmp_fn() has been set, it
- * will use it; otherwise it will call PNG_ABORT().  This function was
- * added in libpng-1.5.0.
- */
-PNG_EXPORTA(9, void, png_longjmp, (png_const_structrp png_ptr, int val),
-    PNG_NORETURN);
-
-#ifdef PNG_READ_SUPPORTED
-/* Reset the compression stream */
-PNG_EXPORTA(10, int, png_reset_zstream, (png_structrp png_ptr), PNG_DEPRECATED);
-#endif
-
-/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
-#ifdef PNG_USER_MEM_SUPPORTED
-PNG_EXPORTA(11, png_structp, png_create_read_struct_2,
-    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
-    png_error_ptr warn_fn,
-    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
-    PNG_ALLOCATED);
-PNG_EXPORTA(12, png_structp, png_create_write_struct_2,
-    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
-    png_error_ptr warn_fn,
-    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
-    PNG_ALLOCATED);
-#endif
-
-/* Write the PNG file signature. */
-PNG_EXPORT(13, void, png_write_sig, (png_structrp png_ptr));
-
-/* Write a PNG chunk - size, type, (optional) data, CRC. */
-PNG_EXPORT(14, void, png_write_chunk, (png_structrp png_ptr, png_const_bytep
-    chunk_name, png_const_bytep data, png_size_t length));
-
-/* Write the start of a PNG chunk - length and chunk name. */
-PNG_EXPORT(15, void, png_write_chunk_start, (png_structrp png_ptr,
-    png_const_bytep chunk_name, png_uint_32 length));
-
-/* Write the data of a PNG chunk started with png_write_chunk_start(). */
-PNG_EXPORT(16, void, png_write_chunk_data, (png_structrp png_ptr,
-    png_const_bytep data, png_size_t length));
-
-/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
-PNG_EXPORT(17, void, png_write_chunk_end, (png_structrp png_ptr));
-
-/* Allocate and initialize the info structure */
-PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_const_structrp png_ptr),
-    PNG_ALLOCATED);
-
-/* DEPRECATED: this function allowed init structures to be created using the
- * default allocation method (typically malloc).  Use is deprecated in 1.6.0 and
- * the API will be removed in the future.
- */
-PNG_EXPORTA(19, void, png_info_init_3, (png_infopp info_ptr,
-    png_size_t png_info_struct_size), PNG_DEPRECATED);
-
-/* Writes all the PNG information before the image. */
-PNG_EXPORT(20, void, png_write_info_before_PLTE,
-    (png_structrp png_ptr, png_const_inforp info_ptr));
-PNG_EXPORT(21, void, png_write_info,
-    (png_structrp png_ptr, png_const_inforp info_ptr));
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-/* Read the information before the actual image data. */
-PNG_EXPORT(22, void, png_read_info,
-    (png_structrp png_ptr, png_inforp info_ptr));
-#endif
-
-#ifdef PNG_TIME_RFC1123_SUPPORTED
-   /* Convert to a US string format: there is no localization support in this
-    * routine.  The original implementation used a 29 character buffer in
-    * png_struct, this will be removed in future versions.
-    */
-#if PNG_LIBPNG_VER < 10700
-/* To do: remove this from libpng17 (and from libpng17/png.c and pngstruct.h) */
-PNG_EXPORTA(23, png_const_charp, png_convert_to_rfc1123, (png_structrp png_ptr,
-    png_const_timep ptime),PNG_DEPRECATED);
-#endif
-PNG_EXPORT(241, int, png_convert_to_rfc1123_buffer, (char out[29],
-    png_const_timep ptime));
-#endif
-
-#ifdef PNG_CONVERT_tIME_SUPPORTED
-/* Convert from a struct tm to png_time */
-PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime,
-    const struct tm * ttime));
-
-/* Convert from time_t to png_time.  Uses gmtime() */
-PNG_EXPORT(25, void, png_convert_from_time_t, (png_timep ptime, time_t ttime));
-#endif /* CONVERT_tIME */
-
-#ifdef PNG_READ_EXPAND_SUPPORTED
-/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
-PNG_EXPORT(26, void, png_set_expand, (png_structrp png_ptr));
-PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structrp png_ptr));
-PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structrp png_ptr));
-PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structrp png_ptr));
-#endif
-
-#ifdef PNG_READ_EXPAND_16_SUPPORTED
-/* Expand to 16-bit channels, forces conversion of palette to RGB and expansion
- * of a tRNS chunk if present.
- */
-PNG_EXPORT(221, void, png_set_expand_16, (png_structrp png_ptr));
-#endif
-
-#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-/* Use blue, green, red order for pixels. */
-PNG_EXPORT(30, void, png_set_bgr, (png_structrp png_ptr));
-#endif
-
-#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
-/* Expand the grayscale to 24-bit RGB if necessary. */
-PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structrp png_ptr));
-#endif
-
-#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-/* Reduce RGB to grayscale. */
-#define PNG_ERROR_ACTION_NONE  1
-#define PNG_ERROR_ACTION_WARN  2
-#define PNG_ERROR_ACTION_ERROR 3
-#define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/
-
-PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structrp png_ptr,
-    int error_action, double red, double green))
-PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structrp png_ptr,
-    int error_action, png_fixed_point red, png_fixed_point green))
-
-PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structrp
-    png_ptr));
-#endif
-
-#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
-PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth,
-    png_colorp palette));
-#endif
-
-#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
-/* How the alpha channel is interpreted - this affects how the color channels
- * of a PNG file are returned to the calling application when an alpha channel,
- * or a tRNS chunk in a palette file, is present.
- *
- * This has no effect on the way pixels are written into a PNG output
- * datastream. The color samples in a PNG datastream are never premultiplied
- * with the alpha samples.
- *
- * The default is to return data according to the PNG specification: the alpha
- * channel is a linear measure of the contribution of the pixel to the
- * corresponding composited pixel, and the color channels are unassociated
- * (not premultiplied).  The gamma encoded color channels must be scaled
- * according to the contribution and to do this it is necessary to undo
- * the encoding, scale the color values, perform the composition and reencode
- * the values.  This is the 'PNG' mode.
- *
- * The alternative is to 'associate' the alpha with the color information by
- * storing color channel values that have been scaled by the alpha.
- * image.  These are the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' modes
- * (the latter being the two common names for associated alpha color channels).
- *
- * For the 'OPTIMIZED' mode, a pixel is treated as opaque only if the alpha
- * value is equal to the maximum value.
- *
- * The final choice is to gamma encode the alpha channel as well.  This is
- * broken because, in practice, no implementation that uses this choice
- * correctly undoes the encoding before handling alpha composition.  Use this
- * choice only if other serious errors in the software or hardware you use
- * mandate it; the typical serious error is for dark halos to appear around
- * opaque areas of the composited PNG image because of arithmetic overflow.
- *
- * The API function png_set_alpha_mode specifies which of these choices to use
- * with an enumerated 'mode' value and the gamma of the required output:
- */
-#define PNG_ALPHA_PNG           0 /* according to the PNG standard */
-#define PNG_ALPHA_STANDARD      1 /* according to Porter/Duff */
-#define PNG_ALPHA_ASSOCIATED    1 /* as above; this is the normal practice */
-#define PNG_ALPHA_PREMULTIPLIED 1 /* as above */
-#define PNG_ALPHA_OPTIMIZED     2 /* 'PNG' for opaque pixels, else 'STANDARD' */
-#define PNG_ALPHA_BROKEN        3 /* the alpha channel is gamma encoded */
-
-PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structrp png_ptr, int mode,
-    double output_gamma))
-PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structrp png_ptr,
-    int mode, png_fixed_point output_gamma))
-#endif
-
-#if defined(PNG_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED)
-/* The output_gamma value is a screen gamma in libpng terminology: it expresses
- * how to decode the output values, not how they are encoded.
- */
-#define PNG_DEFAULT_sRGB -1       /* sRGB gamma and color space */
-#define PNG_GAMMA_MAC_18 -2       /* Old Mac '1.8' gamma and color space */
-#define PNG_GAMMA_sRGB   220000   /* Television standards--matches sRGB gamma */
-#define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */
-#endif
-
-/* The following are examples of calls to png_set_alpha_mode to achieve the
- * required overall gamma correction and, where necessary, alpha
- * premultiplication.
- *
- * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
- *    This is the default libpng handling of the alpha channel - it is not
- *    pre-multiplied into the color components.  In addition the call states
- *    that the output is for a sRGB system and causes all PNG files without gAMA
- *    chunks to be assumed to be encoded using sRGB.
- *
- * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
- *    In this case the output is assumed to be something like an sRGB conformant
- *    display preceeded by a power-law lookup table of power 1.45.  This is how
- *    early Mac systems behaved.
- *
- * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR);
- *    This is the classic Jim Blinn approach and will work in academic
- *    environments where everything is done by the book.  It has the shortcoming
- *    of assuming that input PNG data with no gamma information is linear - this
- *    is unlikely to be correct unless the PNG files where generated locally.
- *    Most of the time the output precision will be so low as to show
- *    significant banding in dark areas of the image.
- *
- * png_set_expand_16(pp);
- * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB);
- *    This is a somewhat more realistic Jim Blinn inspired approach.  PNG files
- *    are assumed to have the sRGB encoding if not marked with a gamma value and
- *    the output is always 16 bits per component.  This permits accurate scaling
- *    and processing of the data.  If you know that your input PNG files were
- *    generated locally you might need to replace PNG_DEFAULT_sRGB with the
- *    correct value for your system.
- *
- * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB);
- *    If you just need to composite the PNG image onto an existing background
- *    and if you control the code that does this you can use the optimization
- *    setting.  In this case you just copy completely opaque pixels to the
- *    output.  For pixels that are not completely transparent (you just skip
- *    those) you do the composition math using png_composite or png_composite_16
- *    below then encode the resultant 8-bit or 16-bit values to match the output
- *    encoding.
- *
- * Other cases
- *    If neither the PNG nor the standard linear encoding work for you because
- *    of the software or hardware you use then you have a big problem.  The PNG
- *    case will probably result in halos around the image.  The linear encoding
- *    will probably result in a washed out, too bright, image (it's actually too
- *    contrasty.)  Try the ALPHA_OPTIMIZED mode above - this will probably
- *    substantially reduce the halos.  Alternatively try:
- *
- * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB);
- *    This option will also reduce the halos, but there will be slight dark
- *    halos round the opaque parts of the image where the background is light.
- *    In the OPTIMIZED mode the halos will be light halos where the background
- *    is dark.  Take your pick - the halos are unavoidable unless you can get
- *    your hardware/software fixed!  (The OPTIMIZED approach is slightly
- *    faster.)
- *
- * When the default gamma of PNG files doesn't match the output gamma.
- *    If you have PNG files with no gamma information png_set_alpha_mode allows
- *    you to provide a default gamma, but it also sets the ouput gamma to the
- *    matching value.  If you know your PNG files have a gamma that doesn't
- *    match the output you can take advantage of the fact that
- *    png_set_alpha_mode always sets the output gamma but only sets the PNG
- *    default if it is not already set:
- *
- * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
- * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
- *    The first call sets both the default and the output gamma values, the
- *    second call overrides the output gamma without changing the default.  This
- *    is easier than achieving the same effect with png_set_gamma.  You must use
- *    PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will
- *    fire if more than one call to png_set_alpha_mode and png_set_background is
- *    made in the same read operation, however multiple calls with PNG_ALPHA_PNG
- *    are ignored.
- */
-
-#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
-PNG_EXPORT(36, void, png_set_strip_alpha, (png_structrp png_ptr));
-#endif
-
-#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
-    defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-PNG_EXPORT(37, void, png_set_swap_alpha, (png_structrp png_ptr));
-#endif
-
-#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
-    defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-PNG_EXPORT(38, void, png_set_invert_alpha, (png_structrp png_ptr));
-#endif
-
-#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
-/* Add a filler byte to 8-bit or 16-bit Gray or 24-bit or 48-bit RGB images. */
-PNG_EXPORT(39, void, png_set_filler, (png_structrp png_ptr, png_uint_32 filler,
-    int flags));
-/* The values of the PNG_FILLER_ defines should NOT be changed */
-#  define PNG_FILLER_BEFORE 0
-#  define PNG_FILLER_AFTER 1
-/* Add an alpha byte to 8-bit or 16-bit Gray or 24-bit or 48-bit RGB images. */
-PNG_EXPORT(40, void, png_set_add_alpha, (png_structrp png_ptr,
-    png_uint_32 filler, int flags));
-#endif /* READ_FILLER || WRITE_FILLER */
-
-#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
-/* Swap bytes in 16-bit depth files. */
-PNG_EXPORT(41, void, png_set_swap, (png_structrp png_ptr));
-#endif
-
-#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
-/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
-PNG_EXPORT(42, void, png_set_packing, (png_structrp png_ptr));
-#endif
-
-#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
-    defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-/* Swap packing order of pixels in bytes. */
-PNG_EXPORT(43, void, png_set_packswap, (png_structrp png_ptr));
-#endif
-
-#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
-/* Converts files to legal bit depths. */
-PNG_EXPORT(44, void, png_set_shift, (png_structrp png_ptr, png_const_color_8p
-    true_bits));
-#endif
-
-#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
-    defined(PNG_WRITE_INTERLACING_SUPPORTED)
-/* Have the code handle the interlacing.  Returns the number of passes.
- * MUST be called before png_read_update_info or png_start_read_image,
- * otherwise it will not have the desired effect.  Note that it is still
- * necessary to call png_read_row or png_read_rows png_get_image_height
- * times for each pass.
-*/
-PNG_EXPORT(45, int, png_set_interlace_handling, (png_structrp png_ptr));
-#endif
-
-#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
-/* Invert monochrome files */
-PNG_EXPORT(46, void, png_set_invert_mono, (png_structrp png_ptr));
-#endif
-
-#ifdef PNG_READ_BACKGROUND_SUPPORTED
-/* Handle alpha and tRNS by replacing with a background color.  Prior to
- * libpng-1.5.4 this API must not be called before the PNG file header has been
- * read.  Doing so will result in unexpected behavior and possible warnings or
- * errors if the PNG file contains a bKGD chunk.
- */
-PNG_FP_EXPORT(47, void, png_set_background, (png_structrp png_ptr,
-    png_const_color_16p background_color, int background_gamma_code,
-    int need_expand, double background_gamma))
-PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structrp png_ptr,
-    png_const_color_16p background_color, int background_gamma_code,
-    int need_expand, png_fixed_point background_gamma))
-#endif
-#ifdef PNG_READ_BACKGROUND_SUPPORTED
-#  define PNG_BACKGROUND_GAMMA_UNKNOWN 0
-#  define PNG_BACKGROUND_GAMMA_SCREEN  1
-#  define PNG_BACKGROUND_GAMMA_FILE    2
-#  define PNG_BACKGROUND_GAMMA_UNIQUE  3
-#endif
-
-#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
-/* Scale a 16-bit depth file down to 8-bit, accurately. */
-PNG_EXPORT(229, void, png_set_scale_16, (png_structrp png_ptr));
-#endif
-
-#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
-#define PNG_READ_16_TO_8_SUPPORTED /* Name prior to 1.5.4 */
-/* Strip the second byte of information from a 16-bit depth file. */
-PNG_EXPORT(48, void, png_set_strip_16, (png_structrp png_ptr));
-#endif
-
-#ifdef PNG_READ_QUANTIZE_SUPPORTED
-/* Turn on quantizing, and reduce the palette to the number of colors
- * available.
- */
-PNG_EXPORT(49, void, png_set_quantize, (png_structrp png_ptr,
-    png_colorp palette, int num_palette, int maximum_colors,
-    png_const_uint_16p histogram, int full_quantize));
-#endif
-
-#ifdef PNG_READ_GAMMA_SUPPORTED
-/* The threshold on gamma processing is configurable but hard-wired into the
- * library.  The following is the floating point variant.
- */
-#define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001)
-
-/* Handle gamma correction. Screen_gamma=(display_exponent).
- * NOTE: this API simply sets the screen and file gamma values. It will
- * therefore override the value for gamma in a PNG file if it is called after
- * the file header has been read - use with care  - call before reading the PNG
- * file for best results!
- *
- * These routines accept the same gamma values as png_set_alpha_mode (described
- * above).  The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either
- * API (floating point or fixed.)  Notice, however, that the 'file_gamma' value
- * is the inverse of a 'screen gamma' value.
- */
-PNG_FP_EXPORT(50, void, png_set_gamma, (png_structrp png_ptr,
-    double screen_gamma, double override_file_gamma))
-PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structrp png_ptr,
-    png_fixed_point screen_gamma, png_fixed_point override_file_gamma))
-#endif
-
-#ifdef PNG_WRITE_FLUSH_SUPPORTED
-/* Set how many lines between output flushes - 0 for no flushing */
-PNG_EXPORT(51, void, png_set_flush, (png_structrp png_ptr, int nrows));
-/* Flush the current PNG output buffer */
-PNG_EXPORT(52, void, png_write_flush, (png_structrp png_ptr));
-#endif
-
-/* Optional update palette with requested transformations */
-PNG_EXPORT(53, void, png_start_read_image, (png_structrp png_ptr));
-
-/* Optional call to update the users info structure */
-PNG_EXPORT(54, void, png_read_update_info, (png_structrp png_ptr,
-    png_inforp info_ptr));
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-/* Read one or more rows of image data. */
-PNG_EXPORT(55, void, png_read_rows, (png_structrp png_ptr, png_bytepp row,
-    png_bytepp display_row, png_uint_32 num_rows));
-#endif
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-/* Read a row of data. */
-PNG_EXPORT(56, void, png_read_row, (png_structrp png_ptr, png_bytep row,
-    png_bytep display_row));
-#endif
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-/* Read the whole image into memory at once. */
-PNG_EXPORT(57, void, png_read_image, (png_structrp png_ptr, png_bytepp image));
-#endif
-
-/* Write a row of image data */
-PNG_EXPORT(58, void, png_write_row, (png_structrp png_ptr,
-    png_const_bytep row));
-
-/* Write a few rows of image data: (*row) is not written; however, the type
- * is declared as writeable to maintain compatibility with previous versions
- * of libpng and to allow the 'display_row' array from read_rows to be passed
- * unchanged to write_rows.
- */
-PNG_EXPORT(59, void, png_write_rows, (png_structrp png_ptr, png_bytepp row,
-    png_uint_32 num_rows));
-
-/* Write the image data */
-PNG_EXPORT(60, void, png_write_image, (png_structrp png_ptr, png_bytepp image));
-
-/* Write the end of the PNG file. */
-PNG_EXPORT(61, void, png_write_end, (png_structrp png_ptr,
-    png_inforp info_ptr));
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-/* Read the end of the PNG file. */
-PNG_EXPORT(62, void, png_read_end, (png_structrp png_ptr, png_inforp info_ptr));
-#endif
-
-/* Free any memory associated with the png_info_struct */
-PNG_EXPORT(63, void, png_destroy_info_struct, (png_const_structrp png_ptr,
-    png_infopp info_ptr_ptr));
-
-/* Free any memory associated with the png_struct and the png_info_structs */
-PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr,
-    png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
-
-/* Free any memory associated with the png_struct and the png_info_structs */
-PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr,
-    png_infopp info_ptr_ptr));
-
-/* Set the libpng method of handling chunk CRC errors */
-PNG_EXPORT(66, void, png_set_crc_action, (png_structrp png_ptr, int crit_action,
-    int ancil_action));
-
-/* Values for png_set_crc_action() say how to handle CRC errors in
- * ancillary and critical chunks, and whether to use the data contained
- * therein.  Note that it is impossible to "discard" data in a critical
- * chunk.  For versions prior to 0.90, the action was always error/quit,
- * whereas in version 0.90 and later, the action for CRC errors in ancillary
- * chunks is warn/discard.  These values should NOT be changed.
- *
- *      value                       action:critical     action:ancillary
- */
-#define PNG_CRC_DEFAULT       0  /* error/quit          warn/discard data */
-#define PNG_CRC_ERROR_QUIT    1  /* error/quit          error/quit        */
-#define PNG_CRC_WARN_DISCARD  2  /* (INVALID)           warn/discard data */
-#define PNG_CRC_WARN_USE      3  /* warn/use data       warn/use data     */
-#define PNG_CRC_QUIET_USE     4  /* quiet/use data      quiet/use data    */
-#define PNG_CRC_NO_CHANGE     5  /* use current value   use current value */
-
-#ifdef PNG_WRITE_SUPPORTED
-/* These functions give the user control over the scan-line filtering in
- * libpng and the compression methods used by zlib.  These functions are
- * mainly useful for testing, as the defaults should work with most users.
- * Those users who are tight on memory or want faster performance at the
- * expense of compression can modify them.  See the compression library
- * header file (zlib.h) for an explination of the compression functions.
- */
-
-/* Set the filtering method(s) used by libpng.  Currently, the only valid
- * value for "method" is 0.
- */
-PNG_EXPORT(67, void, png_set_filter, (png_structrp png_ptr, int method,
-    int filters));
-#endif /* WRITE */
-
-/* Flags for png_set_filter() to say which filters to use.  The flags
- * are chosen so that they don't conflict with real filter types
- * below, in case they are supplied instead of the #defined constants.
- * These values should NOT be changed.
- */
-#define PNG_NO_FILTERS     0x00
-#define PNG_FILTER_NONE    0x08
-#define PNG_FILTER_SUB     0x10
-#define PNG_FILTER_UP      0x20
-#define PNG_FILTER_AVG     0x40
-#define PNG_FILTER_PAETH   0x80
-#define PNG_FAST_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP)
-#define PNG_ALL_FILTERS (PNG_FAST_FILTERS | PNG_FILTER_AVG | PNG_FILTER_PAETH)
-
-/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
- * These defines should NOT be changed.
- */
-#define PNG_FILTER_VALUE_NONE  0
-#define PNG_FILTER_VALUE_SUB   1
-#define PNG_FILTER_VALUE_UP    2
-#define PNG_FILTER_VALUE_AVG   3
-#define PNG_FILTER_VALUE_PAETH 4
-#define PNG_FILTER_VALUE_LAST  5
-
-#ifdef PNG_WRITE_SUPPORTED
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* DEPRECATED */
-PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structrp png_ptr,
-    int heuristic_method, int num_weights, png_const_doublep filter_weights,
-    png_const_doublep filter_costs))
-PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed,
-    (png_structrp png_ptr, int heuristic_method, int num_weights,
-    png_const_fixed_point_p filter_weights,
-    png_const_fixed_point_p filter_costs))
-#endif /* WRITE_WEIGHTED_FILTER */
-
-/* The following are no longer used and will be removed from libpng-1.7: */
-#define PNG_FILTER_HEURISTIC_DEFAULT    0  /* Currently "UNWEIGHTED" */
-#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1  /* Used by libpng < 0.95 */
-#define PNG_FILTER_HEURISTIC_WEIGHTED   2  /* Experimental feature */
-#define PNG_FILTER_HEURISTIC_LAST       3  /* Not a valid value */
-
-/* Set the library compression level.  Currently, valid values range from
- * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
- * (0 - no compression, 9 - "maximal" compression).  Note that tests have
- * shown that zlib compression levels 3-6 usually perform as well as level 9
- * for PNG images, and do considerably fewer caclulations.  In the future,
- * these values may not correspond directly to the zlib compression levels.
- */
-#ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
-PNG_EXPORT(69, void, png_set_compression_level, (png_structrp png_ptr,
-    int level));
-
-PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structrp png_ptr,
-    int mem_level));
-
-PNG_EXPORT(71, void, png_set_compression_strategy, (png_structrp png_ptr,
-    int strategy));
-
-/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
- * smaller value of window_bits if it can do so safely.
- */
-PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structrp png_ptr,
-    int window_bits));
-
-PNG_EXPORT(73, void, png_set_compression_method, (png_structrp png_ptr,
-    int method));
-#endif /* WRITE_CUSTOMIZE_COMPRESSION */
-
-#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
-/* Also set zlib parameters for compressing non-IDAT chunks */
-PNG_EXPORT(222, void, png_set_text_compression_level, (png_structrp png_ptr,
-    int level));
-
-PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structrp png_ptr,
-    int mem_level));
-
-PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structrp png_ptr,
-    int strategy));
-
-/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
- * smaller value of window_bits if it can do so safely.
- */
-PNG_EXPORT(225, void, png_set_text_compression_window_bits,
-    (png_structrp png_ptr, int window_bits));
-
-PNG_EXPORT(226, void, png_set_text_compression_method, (png_structrp png_ptr,
-    int method));
-#endif /* WRITE_CUSTOMIZE_ZTXT_COMPRESSION */
-#endif /* WRITE */
-
-/* These next functions are called for input/output, memory, and error
- * handling.  They are in the file pngrio.c, pngwio.c, and pngerror.c,
- * and call standard C I/O routines such as fread(), fwrite(), and
- * fprintf().  These functions can be made to use other I/O routines
- * at run time for those applications that need to handle I/O in a
- * different manner by calling png_set_???_fn().  See libpng-manual.txt for
- * more information.
- */
-
-#ifdef PNG_STDIO_SUPPORTED
-/* Initialize the input/output for the PNG file to the default functions. */
-PNG_EXPORT(74, void, png_init_io, (png_structrp png_ptr, png_FILE_p fp));
-#endif
-
-/* Replace the (error and abort), and warning functions with user
- * supplied functions.  If no messages are to be printed you must still
- * write and use replacement functions. The replacement error_fn should
- * still do a longjmp to the last setjmp location if you are using this
- * method of error handling.  If error_fn or warning_fn is NULL, the
- * default function will be used.
- */
-
-PNG_EXPORT(75, void, png_set_error_fn, (png_structrp png_ptr,
-    png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
-
-/* Return the user pointer associated with the error functions */
-PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structrp png_ptr));
-
-/* Replace the default data output functions with a user supplied one(s).
- * If buffered output is not used, then output_flush_fn can be set to NULL.
- * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
- * output_flush_fn will be ignored (and thus can be NULL).
- * It is probably a mistake to use NULL for output_flush_fn if
- * write_data_fn is not also NULL unless you have built libpng with
- * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
- * default flush function, which uses the standard *FILE structure, will
- * be used.
- */
-PNG_EXPORT(77, void, png_set_write_fn, (png_structrp png_ptr, png_voidp io_ptr,
-    png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
-
-/* Replace the default data input function with a user supplied one. */
-PNG_EXPORT(78, void, png_set_read_fn, (png_structrp png_ptr, png_voidp io_ptr,
-    png_rw_ptr read_data_fn));
-
-/* Return the user pointer associated with the I/O functions */
-PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_const_structrp png_ptr));
-
-PNG_EXPORT(80, void, png_set_read_status_fn, (png_structrp png_ptr,
-    png_read_status_ptr read_row_fn));
-
-PNG_EXPORT(81, void, png_set_write_status_fn, (png_structrp png_ptr,
-    png_write_status_ptr write_row_fn));
-
-#ifdef PNG_USER_MEM_SUPPORTED
-/* Replace the default memory allocation functions with user supplied one(s). */
-PNG_EXPORT(82, void, png_set_mem_fn, (png_structrp png_ptr, png_voidp mem_ptr,
-    png_malloc_ptr malloc_fn, png_free_ptr free_fn));
-/* Return the user pointer associated with the memory functions */
-PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structrp png_ptr));
-#endif
-
-#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
-PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structrp png_ptr,
-    png_user_transform_ptr read_user_transform_fn));
-#endif
-
-#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
-PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structrp png_ptr,
-    png_user_transform_ptr write_user_transform_fn));
-#endif
-
-#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
-PNG_EXPORT(86, void, png_set_user_transform_info, (png_structrp png_ptr,
-    png_voidp user_transform_ptr, int user_transform_depth,
-    int user_transform_channels));
-/* Return the user pointer associated with the user transform functions */
-PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr,
-    (png_const_structrp png_ptr));
-#endif
-
-#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED
-/* Return information about the row currently being processed.  Note that these
- * APIs do not fail but will return unexpected results if called outside a user
- * transform callback.  Also note that when transforming an interlaced image the
- * row number is the row number within the sub-image of the interlace pass, so
- * the value will increase to the height of the sub-image (not the full image)
- * then reset to 0 for the next pass.
- *
- * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
- * find the output pixel (x,y) given an interlaced sub-image pixel
- * (row,col,pass).  (See below for these macros.)
- */
-PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structrp));
-PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structrp));
-#endif
-
-#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
-/* This callback is called only for *unknown* chunks.  If
- * PNG_HANDLE_AS_UNKNOWN_SUPPORTED is set then it is possible to set known
- * chunks to be treated as unknown, however in this case the callback must do
- * any processing required by the chunk (e.g. by calling the appropriate
- * png_set_ APIs.)
- *
- * There is no write support - on write, by default, all the chunks in the
- * 'unknown' list are written in the specified position.
- *
- * The integer return from the callback function is interpreted thus:
- *
- * negative: An error occurred; png_chunk_error will be called.
- *     zero: The chunk was not handled, the chunk will be saved. A critical
- *           chunk will cause an error at this point unless it is to be saved.
- * positive: The chunk was handled, libpng will ignore/discard it.
- *
- * See "INTERACTION WTIH USER CHUNK CALLBACKS" below for important notes about
- * how this behavior will change in libpng 1.7
- */
-PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structrp png_ptr,
-    png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
-#endif
-
-#ifdef PNG_USER_CHUNKS_SUPPORTED
-PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structrp png_ptr));
-#endif
-
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-/* Sets the function callbacks for the push reader, and a pointer to a
- * user-defined structure available to the callback functions.
- */
-PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structrp png_ptr,
-    png_voidp progressive_ptr, png_progressive_info_ptr info_fn,
-    png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn));
-
-/* Returns the user pointer associated with the push read functions */
-PNG_EXPORT(91, png_voidp, png_get_progressive_ptr,
-    (png_const_structrp png_ptr));
-
-/* Function to be called when data becomes available */
-PNG_EXPORT(92, void, png_process_data, (png_structrp png_ptr,
-    png_inforp info_ptr, png_bytep buffer, png_size_t buffer_size));
-
-/* A function which may be called *only* within png_process_data to stop the
- * processing of any more data.  The function returns the number of bytes
- * remaining, excluding any that libpng has cached internally.  A subsequent
- * call to png_process_data must supply these bytes again.  If the argument
- * 'save' is set to true the routine will first save all the pending data and
- * will always return 0.
- */
-PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structrp, int save));
-
-/* A function which may be called *only* outside (after) a call to
- * png_process_data.  It returns the number of bytes of data to skip in the
- * input.  Normally it will return 0, but if it returns a non-zero value the
- * application must skip than number of bytes of input data and pass the
- * following data to the next call to png_process_data.
- */
-PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structrp));
-
-/* Function that combines rows.  'new_row' is a flag that should come from
- * the callback and be non-NULL if anything needs to be done; the library
- * stores its own version of the new data internally and ignores the passed
- * in value.
- */
-PNG_EXPORT(93, void, png_progressive_combine_row, (png_const_structrp png_ptr,
-    png_bytep old_row, png_const_bytep new_row));
-#endif /* PROGRESSIVE_READ */
-
-PNG_EXPORTA(94, png_voidp, png_malloc, (png_const_structrp png_ptr,
-    png_alloc_size_t size), PNG_ALLOCATED);
-/* Added at libpng version 1.4.0 */
-PNG_EXPORTA(95, png_voidp, png_calloc, (png_const_structrp png_ptr,
-    png_alloc_size_t size), PNG_ALLOCATED);
-
-/* Added at libpng version 1.2.4 */
-PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_const_structrp png_ptr,
-    png_alloc_size_t size), PNG_ALLOCATED);
-
-/* Frees a pointer allocated by png_malloc() */
-PNG_EXPORT(97, void, png_free, (png_const_structrp png_ptr, png_voidp ptr));
-
-/* Free data that was allocated internally */
-PNG_EXPORT(98, void, png_free_data, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 free_me, int num));
-
-/* Reassign responsibility for freeing existing data, whether allocated
- * by libpng or by the application; this works on the png_info structure passed
- * in, it does not change the state for other png_info structures.
- *
- * It is unlikely that this function works correctly as of 1.6.0 and using it
- * may result either in memory leaks or double free of allocated data.
- */
-PNG_EXPORT(99, void, png_data_freer, (png_const_structrp png_ptr,
-    png_inforp info_ptr, int freer, png_uint_32 mask));
-
-/* Assignments for png_data_freer */
-#define PNG_DESTROY_WILL_FREE_DATA 1
-#define PNG_SET_WILL_FREE_DATA 1
-#define PNG_USER_WILL_FREE_DATA 2
-/* Flags for png_ptr->free_me and info_ptr->free_me */
-#define PNG_FREE_HIST 0x0008U
-#define PNG_FREE_ICCP 0x0010U
-#define PNG_FREE_SPLT 0x0020U
-#define PNG_FREE_ROWS 0x0040U
-#define PNG_FREE_PCAL 0x0080U
-#define PNG_FREE_SCAL 0x0100U
-#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
-#  define PNG_FREE_UNKN 0x0200U
-#endif
-/*      PNG_FREE_LIST 0x0400U   removed in 1.6.0 because it is ignored */
-#define PNG_FREE_PLTE 0x1000U
-#define PNG_FREE_TRNS 0x2000U
-#define PNG_FREE_TEXT 0x4000U
-#define PNG_FREE_EXIF 0x8000U /* Added at libpng-1.6.31 */
-#define PNG_FREE_ALL  0xffffU
-#define PNG_FREE_MUL  0x4220U /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
-
-#ifdef PNG_USER_MEM_SUPPORTED
-PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_const_structrp png_ptr,
-    png_alloc_size_t size), PNG_ALLOCATED PNG_DEPRECATED);
-PNG_EXPORTA(101, void, png_free_default, (png_const_structrp png_ptr,
-    png_voidp ptr), PNG_DEPRECATED);
-#endif
-
-#ifdef PNG_ERROR_TEXT_SUPPORTED
-/* Fatal error in PNG image of libpng - can't continue */
-PNG_EXPORTA(102, void, png_error, (png_const_structrp png_ptr,
-    png_const_charp error_message), PNG_NORETURN);
-
-/* The same, but the chunk name is prepended to the error string. */
-PNG_EXPORTA(103, void, png_chunk_error, (png_const_structrp png_ptr,
-    png_const_charp error_message), PNG_NORETURN);
-
-#else
-/* Fatal error in PNG image of libpng - can't continue */
-PNG_EXPORTA(104, void, png_err, (png_const_structrp png_ptr), PNG_NORETURN);
-#  define png_error(s1,s2) png_err(s1)
-#  define png_chunk_error(s1,s2) png_err(s1)
-#endif
-
-#ifdef PNG_WARNINGS_SUPPORTED
-/* Non-fatal error in libpng.  Can continue, but may have a problem. */
-PNG_EXPORT(105, void, png_warning, (png_const_structrp png_ptr,
-    png_const_charp warning_message));
-
-/* Non-fatal error in libpng, chunk name is prepended to message. */
-PNG_EXPORT(106, void, png_chunk_warning, (png_const_structrp png_ptr,
-    png_const_charp warning_message));
-#else
-#  define png_warning(s1,s2) ((void)(s1))
-#  define png_chunk_warning(s1,s2) ((void)(s1))
-#endif
-
-#ifdef PNG_BENIGN_ERRORS_SUPPORTED
-/* Benign error in libpng.  Can continue, but may have a problem.
- * User can choose whether to handle as a fatal error or as a warning. */
-PNG_EXPORT(107, void, png_benign_error, (png_const_structrp png_ptr,
-    png_const_charp warning_message));
-
-#ifdef PNG_READ_SUPPORTED
-/* Same, chunk name is prepended to message (only during read) */
-PNG_EXPORT(108, void, png_chunk_benign_error, (png_const_structrp png_ptr,
-    png_const_charp warning_message));
-#endif
-
-PNG_EXPORT(109, void, png_set_benign_errors,
-    (png_structrp png_ptr, int allowed));
-#else
-#  ifdef PNG_ALLOW_BENIGN_ERRORS
-#    define png_benign_error png_warning
-#    define png_chunk_benign_error png_chunk_warning
-#  else
-#    define png_benign_error png_error
-#    define png_chunk_benign_error png_chunk_error
-#  endif
-#endif
-
-/* The png_set_<chunk> functions are for storing values in the png_info_struct.
- * Similarly, the png_get_<chunk> calls are used to read values from the
- * png_info_struct, either storing the parameters in the passed variables, or
- * setting pointers into the png_info_struct where the data is stored.  The
- * png_get_<chunk> functions return a non-zero value if the data was available
- * in info_ptr, or return zero and do not change any of the parameters if the
- * data was not available.
- *
- * These functions should be used instead of directly accessing png_info
- * to avoid problems with future changes in the size and internal layout of
- * png_info_struct.
- */
-/* Returns "flag" if chunk data is valid in info_ptr. */
-PNG_EXPORT(110, png_uint_32, png_get_valid, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr, png_uint_32 flag));
-
-/* Returns number of bytes needed to hold a transformed row. */
-PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr));
-
-#ifdef PNG_INFO_IMAGE_SUPPORTED
-/* Returns row_pointers, which is an array of pointers to scanlines that was
- * returned from png_read_png().
- */
-PNG_EXPORT(112, png_bytepp, png_get_rows, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr));
-
-/* Set row_pointers, which is an array of pointers to scanlines for use
- * by png_write_png().
- */
-PNG_EXPORT(113, void, png_set_rows, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_bytepp row_pointers));
-#endif
-
-/* Returns number of color channels in image. */
-PNG_EXPORT(114, png_byte, png_get_channels, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr));
-
-#ifdef PNG_EASY_ACCESS_SUPPORTED
-/* Returns image width in pixels. */
-PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr));
-
-/* Returns image height in pixels. */
-PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr));
-
-/* Returns image bit_depth. */
-PNG_EXPORT(117, png_byte, png_get_bit_depth, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr));
-
-/* Returns image color_type. */
-PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr));
-
-/* Returns image filter_type. */
-PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr));
-
-/* Returns image interlace_type. */
-PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr));
-
-/* Returns image compression_type. */
-PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr));
-
-/* Returns image resolution in pixels per meter, from pHYs chunk data. */
-PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr));
-PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr));
-PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr));
-
-/* Returns pixel aspect ratio, computed from pHYs chunk data.  */
-PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr))
-PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr))
-
-/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
-PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr));
-PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr));
-PNG_EXPORT(128, png_int_32, png_get_x_offset_microns,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr));
-PNG_EXPORT(129, png_int_32, png_get_y_offset_microns,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr));
-
-#endif /* EASY_ACCESS */
-
-#ifdef PNG_READ_SUPPORTED
-/* Returns pointer to signature string read from PNG header */
-PNG_EXPORT(130, png_const_bytep, png_get_signature, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr));
-#endif
-
-#ifdef PNG_bKGD_SUPPORTED
-PNG_EXPORT(131, png_uint_32, png_get_bKGD, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_color_16p *background));
-#endif
-
-#ifdef PNG_bKGD_SUPPORTED
-PNG_EXPORT(132, void, png_set_bKGD, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_const_color_16p background));
-#endif
-
-#ifdef PNG_cHRM_SUPPORTED
-PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr, double *white_x, double *white_y, double *red_x,
-    double *red_y, double *green_x, double *green_y, double *blue_x,
-    double *blue_y))
-PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr, double *red_X, double *red_Y, double *red_Z,
-    double *green_X, double *green_Y, double *green_Z, double *blue_X,
-    double *blue_Y, double *blue_Z))
-PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr,
-    png_fixed_point *int_white_x, png_fixed_point *int_white_y,
-    png_fixed_point *int_red_x, png_fixed_point *int_red_y,
-    png_fixed_point *int_green_x, png_fixed_point *int_green_y,
-    png_fixed_point *int_blue_x, png_fixed_point *int_blue_y))
-PNG_FIXED_EXPORT(231, png_uint_32, png_get_cHRM_XYZ_fixed,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr,
-    png_fixed_point *int_red_X, png_fixed_point *int_red_Y,
-    png_fixed_point *int_red_Z, png_fixed_point *int_green_X,
-    png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,
-    png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,
-    png_fixed_point *int_blue_Z))
-#endif
-
-#ifdef PNG_cHRM_SUPPORTED
-PNG_FP_EXPORT(135, void, png_set_cHRM, (png_const_structrp png_ptr,
-    png_inforp info_ptr,
-    double white_x, double white_y, double red_x, double red_y, double green_x,
-    double green_y, double blue_x, double blue_y))
-PNG_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_const_structrp png_ptr,
-    png_inforp info_ptr, double red_X, double red_Y, double red_Z,
-    double green_X, double green_Y, double green_Z, double blue_X,
-    double blue_Y, double blue_Z))
-PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_fixed_point int_white_x,
-    png_fixed_point int_white_y, png_fixed_point int_red_x,
-    png_fixed_point int_red_y, png_fixed_point int_green_x,
-    png_fixed_point int_green_y, png_fixed_point int_blue_x,
-    png_fixed_point int_blue_y))
-PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y,
-    png_fixed_point int_red_Z, png_fixed_point int_green_X,
-    png_fixed_point int_green_Y, png_fixed_point int_green_Z,
-    png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
-    png_fixed_point int_blue_Z))
-#endif
-
-#ifdef PNG_eXIf_SUPPORTED
-PNG_EXPORT(246, png_uint_32, png_get_eXIf, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_bytep *exif));
-PNG_EXPORT(247, void, png_set_eXIf, (png_const_structrp png_ptr,
-    png_inforp info_ptr, const png_bytep exif));
-
-PNG_EXPORT(248, png_uint_32, png_get_eXIf_1, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr, png_uint_32 *num_exif, png_bytep *exif));
-PNG_EXPORT(249, void, png_set_eXIf_1, (png_const_structrp png_ptr,
-    png_inforp info_ptr, const png_uint_32 num_exif, const png_bytep exif));
-#endif
-
-#ifdef PNG_gAMA_SUPPORTED
-PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr, double *file_gamma))
-PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr,
-    png_fixed_point *int_file_gamma))
-#endif
-
-#ifdef PNG_gAMA_SUPPORTED
-PNG_FP_EXPORT(139, void, png_set_gAMA, (png_const_structrp png_ptr,
-    png_inforp info_ptr, double file_gamma))
-PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_fixed_point int_file_gamma))
-#endif
-
-#ifdef PNG_hIST_SUPPORTED
-PNG_EXPORT(141, png_uint_32, png_get_hIST, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_uint_16p *hist));
-PNG_EXPORT(142, void, png_set_hIST, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_const_uint_16p hist));
-#endif
-
-PNG_EXPORT(143, png_uint_32, png_get_IHDR, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr, png_uint_32 *width, png_uint_32 *height,
-    int *bit_depth, int *color_type, int *interlace_method,
-    int *compression_method, int *filter_method));
-
-PNG_EXPORT(144, void, png_set_IHDR, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
-    int color_type, int interlace_method, int compression_method,
-    int filter_method));
-
-#ifdef PNG_oFFs_SUPPORTED
-PNG_EXPORT(145, png_uint_32, png_get_oFFs, (png_const_structrp png_ptr,
-   png_const_inforp info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
-   int *unit_type));
-#endif
-
-#ifdef PNG_oFFs_SUPPORTED
-PNG_EXPORT(146, void, png_set_oFFs, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_int_32 offset_x, png_int_32 offset_y,
-    int unit_type));
-#endif
-
-#ifdef PNG_pCAL_SUPPORTED
-PNG_EXPORT(147, png_uint_32, png_get_pCAL, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_charp *purpose, png_int_32 *X0,
-    png_int_32 *X1, int *type, int *nparams, png_charp *units,
-    png_charpp *params));
-#endif
-
-#ifdef PNG_pCAL_SUPPORTED
-PNG_EXPORT(148, void, png_set_pCAL, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_const_charp purpose, png_int_32 X0, png_int_32 X1,
-    int type, int nparams, png_const_charp units, png_charpp params));
-#endif
-
-#ifdef PNG_pHYs_SUPPORTED
-PNG_EXPORT(149, png_uint_32, png_get_pHYs, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y,
-    int *unit_type));
-#endif
-
-#ifdef PNG_pHYs_SUPPORTED
-PNG_EXPORT(150, void, png_set_pHYs, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
-#endif
-
-PNG_EXPORT(151, png_uint_32, png_get_PLTE, (png_const_structrp png_ptr,
-   png_inforp info_ptr, png_colorp *palette, int *num_palette));
-
-PNG_EXPORT(152, void, png_set_PLTE, (png_structrp png_ptr,
-    png_inforp info_ptr, png_const_colorp palette, int num_palette));
-
-#ifdef PNG_sBIT_SUPPORTED
-PNG_EXPORT(153, png_uint_32, png_get_sBIT, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_color_8p *sig_bit));
-#endif
-
-#ifdef PNG_sBIT_SUPPORTED
-PNG_EXPORT(154, void, png_set_sBIT, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_const_color_8p sig_bit));
-#endif
-
-#ifdef PNG_sRGB_SUPPORTED
-PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr, int *file_srgb_intent));
-#endif
-
-#ifdef PNG_sRGB_SUPPORTED
-PNG_EXPORT(156, void, png_set_sRGB, (png_const_structrp png_ptr,
-    png_inforp info_ptr, int srgb_intent));
-PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_const_structrp png_ptr,
-    png_inforp info_ptr, int srgb_intent));
-#endif
-
-#ifdef PNG_iCCP_SUPPORTED
-PNG_EXPORT(158, png_uint_32, png_get_iCCP, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_charpp name, int *compression_type,
-    png_bytepp profile, png_uint_32 *proflen));
-#endif
-
-#ifdef PNG_iCCP_SUPPORTED
-PNG_EXPORT(159, void, png_set_iCCP, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_const_charp name, int compression_type,
-    png_const_bytep profile, png_uint_32 proflen));
-#endif
-
-#ifdef PNG_sPLT_SUPPORTED
-PNG_EXPORT(160, int, png_get_sPLT, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_sPLT_tpp entries));
-#endif
-
-#ifdef PNG_sPLT_SUPPORTED
-PNG_EXPORT(161, void, png_set_sPLT, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_const_sPLT_tp entries, int nentries));
-#endif
-
-#ifdef PNG_TEXT_SUPPORTED
-/* png_get_text also returns the number of text chunks in *num_text */
-PNG_EXPORT(162, int, png_get_text, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_textp *text_ptr, int *num_text));
-#endif
-
-/* Note while png_set_text() will accept a structure whose text,
- * language, and  translated keywords are NULL pointers, the structure
- * returned by png_get_text will always contain regular
- * zero-terminated C strings.  They might be empty strings but
- * they will never be NULL pointers.
- */
-
-#ifdef PNG_TEXT_SUPPORTED
-PNG_EXPORT(163, void, png_set_text, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_const_textp text_ptr, int num_text));
-#endif
-
-#ifdef PNG_tIME_SUPPORTED
-PNG_EXPORT(164, png_uint_32, png_get_tIME, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_timep *mod_time));
-#endif
-
-#ifdef PNG_tIME_SUPPORTED
-PNG_EXPORT(165, void, png_set_tIME, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_const_timep mod_time));
-#endif
-
-#ifdef PNG_tRNS_SUPPORTED
-PNG_EXPORT(166, png_uint_32, png_get_tRNS, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_bytep *trans_alpha, int *num_trans,
-    png_color_16p *trans_color));
-#endif
-
-#ifdef PNG_tRNS_SUPPORTED
-PNG_EXPORT(167, void, png_set_tRNS, (png_structrp png_ptr,
-    png_inforp info_ptr, png_const_bytep trans_alpha, int num_trans,
-    png_const_color_16p trans_color));
-#endif
-
-#ifdef PNG_sCAL_SUPPORTED
-PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr, int *unit, double *width, double *height))
-#if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \
-   defined(PNG_FLOATING_POINT_SUPPORTED)
-/* NOTE: this API is currently implemented using floating point arithmetic,
- * consequently it can only be used on systems with floating point support.
- * In any case the range of values supported by png_fixed_point is small and it
- * is highly recommended that png_get_sCAL_s be used instead.
- */
-PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit,
-    png_fixed_point *width, png_fixed_point *height))
-#endif
-PNG_EXPORT(169, png_uint_32, png_get_sCAL_s,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit,
-    png_charpp swidth, png_charpp sheight));
-
-PNG_FP_EXPORT(170, void, png_set_sCAL, (png_const_structrp png_ptr,
-    png_inforp info_ptr, int unit, double width, double height))
-PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_const_structrp png_ptr,
-   png_inforp info_ptr, int unit, png_fixed_point width,
-   png_fixed_point height))
-PNG_EXPORT(171, void, png_set_sCAL_s, (png_const_structrp png_ptr,
-    png_inforp info_ptr, int unit,
-    png_const_charp swidth, png_const_charp sheight));
-#endif /* sCAL */
-
-#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
-/* Provide the default handling for all unknown chunks or, optionally, for
- * specific unknown chunks.
- *
- * NOTE: prior to 1.6.0 the handling specified for particular chunks on read was
- * ignored and the default was used, the per-chunk setting only had an effect on
- * write.  If you wish to have chunk-specific handling on read in code that must
- * work on earlier versions you must use a user chunk callback to specify the
- * desired handling (keep or discard.)
- *
- * The 'keep' parameter is a PNG_HANDLE_CHUNK_ value as listed below.  The
- * parameter is interpreted as follows:
- *
- * READ:
- *    PNG_HANDLE_CHUNK_AS_DEFAULT:
- *       Known chunks: do normal libpng processing, do not keep the chunk (but
- *          see the comments below about PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
- *       Unknown chunks: for a specific chunk use the global default, when used
- *          as the default discard the chunk data.
- *    PNG_HANDLE_CHUNK_NEVER:
- *       Discard the chunk data.
- *    PNG_HANDLE_CHUNK_IF_SAFE:
- *       Keep the chunk data if the chunk is not critical else raise a chunk
- *       error.
- *    PNG_HANDLE_CHUNK_ALWAYS:
- *       Keep the chunk data.
- *
- * If the chunk data is saved it can be retrieved using png_get_unknown_chunks,
- * below.  Notice that specifying "AS_DEFAULT" as a global default is equivalent
- * to specifying "NEVER", however when "AS_DEFAULT" is used for specific chunks
- * it simply resets the behavior to the libpng default.
- *
- * INTERACTION WTIH USER CHUNK CALLBACKS:
- * The per-chunk handling is always used when there is a png_user_chunk_ptr
- * callback and the callback returns 0; the chunk is then always stored *unless*
- * it is critical and the per-chunk setting is other than ALWAYS.  Notice that
- * the global default is *not* used in this case.  (In effect the per-chunk
- * value is incremented to at least IF_SAFE.)
- *
- * IMPORTANT NOTE: this behavior will change in libpng 1.7 - the global and
- * per-chunk defaults will be honored.  If you want to preserve the current
- * behavior when your callback returns 0 you must set PNG_HANDLE_CHUNK_IF_SAFE
- * as the default - if you don't do this libpng 1.6 will issue a warning.
- *
- * If you want unhandled unknown chunks to be discarded in libpng 1.6 and
- * earlier simply return '1' (handled).
- *
- * PNG_HANDLE_AS_UNKNOWN_SUPPORTED:
- *    If this is *not* set known chunks will always be handled by libpng and
- *    will never be stored in the unknown chunk list.  Known chunks listed to
- *    png_set_keep_unknown_chunks will have no effect.  If it is set then known
- *    chunks listed with a keep other than AS_DEFAULT will *never* be processed
- *    by libpng, in addition critical chunks must either be processed by the
- *    callback or saved.
- *
- *    The IHDR and IEND chunks must not be listed.  Because this turns off the
- *    default handling for chunks that would otherwise be recognized the
- *    behavior of libpng transformations may well become incorrect!
- *
- * WRITE:
- *    When writing chunks the options only apply to the chunks specified by
- *    png_set_unknown_chunks (below), libpng will *always* write known chunks
- *    required by png_set_ calls and will always write the core critical chunks
- *    (as required for PLTE).
- *
- *    Each chunk in the png_set_unknown_chunks list is looked up in the
- *    png_set_keep_unknown_chunks list to find the keep setting, this is then
- *    interpreted as follows:
- *
- *    PNG_HANDLE_CHUNK_AS_DEFAULT:
- *       Write safe-to-copy chunks and write other chunks if the global
- *       default is set to _ALWAYS, otherwise don't write this chunk.
- *    PNG_HANDLE_CHUNK_NEVER:
- *       Do not write the chunk.
- *    PNG_HANDLE_CHUNK_IF_SAFE:
- *       Write the chunk if it is safe-to-copy, otherwise do not write it.
- *    PNG_HANDLE_CHUNK_ALWAYS:
- *       Write the chunk.
- *
- * Note that the default behavior is effectively the opposite of the read case -
- * in read unknown chunks are not stored by default, in write they are written
- * by default.  Also the behavior of PNG_HANDLE_CHUNK_IF_SAFE is very different
- * - on write the safe-to-copy bit is checked, on read the critical bit is
- * checked and on read if the chunk is critical an error will be raised.
- *
- * num_chunks:
- * ===========
- *    If num_chunks is positive, then the "keep" parameter specifies the manner
- *    for handling only those chunks appearing in the chunk_list array,
- *    otherwise the chunk list array is ignored.
- *
- *    If num_chunks is 0 the "keep" parameter specifies the default behavior for
- *    unknown chunks, as described above.
- *
- *    If num_chunks is negative, then the "keep" parameter specifies the manner
- *    for handling all unknown chunks plus all chunks recognized by libpng
- *    except for the IHDR, PLTE, tRNS, IDAT, and IEND chunks (which continue to
- *    be processed by libpng.
- */
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-PNG_EXPORT(172, void, png_set_keep_unknown_chunks, (png_structrp png_ptr,
-    int keep, png_const_bytep chunk_list, int num_chunks));
-#endif /* HANDLE_AS_UNKNOWN */
-
-/* The "keep" PNG_HANDLE_CHUNK_ parameter for the specified chunk is returned;
- * the result is therefore true (non-zero) if special handling is required,
- * false for the default handling.
- */
-PNG_EXPORT(173, int, png_handle_as_unknown, (png_const_structrp png_ptr,
-    png_const_bytep chunk_name));
-#endif /* SET_UNKNOWN_CHUNKS */
-
-#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
-PNG_EXPORT(174, void, png_set_unknown_chunks, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_const_unknown_chunkp unknowns,
-    int num_unknowns));
-   /* NOTE: prior to 1.6.0 this routine set the 'location' field of the added
-    * unknowns to the location currently stored in the png_struct.  This is
-    * invariably the wrong value on write.  To fix this call the following API
-    * for each chunk in the list with the correct location.  If you know your
-    * code won't be compiled on earlier versions you can rely on
-    * png_set_unknown_chunks(write-ptr, png_get_unknown_chunks(read-ptr)) doing
-    * the correct thing.
-    */
-
-PNG_EXPORT(175, void, png_set_unknown_chunk_location,
-    (png_const_structrp png_ptr, png_inforp info_ptr, int chunk, int location));
-
-PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structrp png_ptr,
-    png_inforp info_ptr, png_unknown_chunkpp entries));
-#endif
-
-/* Png_free_data() will turn off the "valid" flag for anything it frees.
- * If you need to turn it off for a chunk that your application has freed,
- * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
- */
-PNG_EXPORT(177, void, png_set_invalid, (png_const_structrp png_ptr,
-    png_inforp info_ptr, int mask));
-
-#ifdef PNG_INFO_IMAGE_SUPPORTED
-/* The "params" pointer is currently not used and is for future expansion. */
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-PNG_EXPORT(178, void, png_read_png, (png_structrp png_ptr, png_inforp info_ptr,
-    int transforms, png_voidp params));
-#endif
-#ifdef PNG_WRITE_SUPPORTED
-PNG_EXPORT(179, void, png_write_png, (png_structrp png_ptr, png_inforp info_ptr,
-    int transforms, png_voidp params));
-#endif
-#endif
-
-PNG_EXPORT(180, png_const_charp, png_get_copyright,
-    (png_const_structrp png_ptr));
-PNG_EXPORT(181, png_const_charp, png_get_header_ver,
-    (png_const_structrp png_ptr));
-PNG_EXPORT(182, png_const_charp, png_get_header_version,
-    (png_const_structrp png_ptr));
-PNG_EXPORT(183, png_const_charp, png_get_libpng_ver,
-    (png_const_structrp png_ptr));
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structrp png_ptr,
-    png_uint_32 mng_features_permitted));
-#endif
-
-/* For use in png_set_keep_unknown, added to version 1.2.6 */
-#define PNG_HANDLE_CHUNK_AS_DEFAULT   0
-#define PNG_HANDLE_CHUNK_NEVER        1
-#define PNG_HANDLE_CHUNK_IF_SAFE      2
-#define PNG_HANDLE_CHUNK_ALWAYS       3
-#define PNG_HANDLE_CHUNK_LAST         4
-
-/* Strip the prepended error numbers ("#nnn ") from error and warning
- * messages before passing them to the error or warning handler.
- */
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
-PNG_EXPORT(185, void, png_set_strip_error_numbers, (png_structrp png_ptr,
-    png_uint_32 strip_mode));
-#endif
-
-/* Added in libpng-1.2.6 */
-#ifdef PNG_SET_USER_LIMITS_SUPPORTED
-PNG_EXPORT(186, void, png_set_user_limits, (png_structrp png_ptr,
-    png_uint_32 user_width_max, png_uint_32 user_height_max));
-PNG_EXPORT(187, png_uint_32, png_get_user_width_max,
-    (png_const_structrp png_ptr));
-PNG_EXPORT(188, png_uint_32, png_get_user_height_max,
-    (png_const_structrp png_ptr));
-/* Added in libpng-1.4.0 */
-PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structrp png_ptr,
-    png_uint_32 user_chunk_cache_max));
-PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max,
-    (png_const_structrp png_ptr));
-/* Added in libpng-1.4.1 */
-PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structrp png_ptr,
-    png_alloc_size_t user_chunk_cache_max));
-PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max,
-    (png_const_structrp png_ptr));
-#endif
-
-#if defined(PNG_INCH_CONVERSIONS_SUPPORTED)
-PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr));
-
-PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr));
-
-PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr));
-
-PNG_FP_EXPORT(196, float, png_get_x_offset_inches,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr))
-#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */
-PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr))
-#endif
-
-PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr))
-#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */
-PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed,
-    (png_const_structrp png_ptr, png_const_inforp info_ptr))
-#endif
-
-#  ifdef PNG_pHYs_SUPPORTED
-PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structrp png_ptr,
-    png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y,
-    int *unit_type));
-#  endif /* pHYs */
-#endif  /* INCH_CONVERSIONS */
-
-/* Added in libpng-1.4.0 */
-#ifdef PNG_IO_STATE_SUPPORTED
-PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_const_structrp png_ptr));
-
-/* Removed from libpng 1.6; use png_get_io_chunk_type. */
-PNG_REMOVED(200, png_const_bytep, png_get_io_chunk_name, (png_structrp png_ptr),
-    PNG_DEPRECATED)
-
-PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type,
-    (png_const_structrp png_ptr));
-
-/* The flags returned by png_get_io_state() are the following: */
-#  define PNG_IO_NONE        0x0000   /* no I/O at this moment */
-#  define PNG_IO_READING     0x0001   /* currently reading */
-#  define PNG_IO_WRITING     0x0002   /* currently writing */
-#  define PNG_IO_SIGNATURE   0x0010   /* currently at the file signature */
-#  define PNG_IO_CHUNK_HDR   0x0020   /* currently at the chunk header */
-#  define PNG_IO_CHUNK_DATA  0x0040   /* currently at the chunk data */
-#  define PNG_IO_CHUNK_CRC   0x0080   /* currently at the chunk crc */
-#  define PNG_IO_MASK_OP     0x000f   /* current operation: reading/writing */
-#  define PNG_IO_MASK_LOC    0x00f0   /* current location: sig/hdr/data/crc */
-#endif /* IO_STATE */
-
-/* Interlace support.  The following macros are always defined so that if
- * libpng interlace handling is turned off the macros may be used to handle
- * interlaced images within the application.
- */
-#define PNG_INTERLACE_ADAM7_PASSES 7
-
-/* Two macros to return the first row and first column of the original,
- * full, image which appears in a given pass.  'pass' is in the range 0
- * to 6 and the result is in the range 0 to 7.
- */
-#define PNG_PASS_START_ROW(pass) (((1&~(pass))<<(3-((pass)>>1)))&7)
-#define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7)
-
-/* A macro to return the offset between pixels in the output row for a pair of
- * pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that
- * follows.  Note that ROW_OFFSET is the offset from one row to the next whereas
- * COL_OFFSET is from one column to the next, within a row.
- */
-#define PNG_PASS_ROW_OFFSET(pass) ((pass)>2?(8>>(((pass)-1)>>1)):8)
-#define PNG_PASS_COL_OFFSET(pass) (1<<((7-(pass))>>1))
-
-/* Two macros to help evaluate the number of rows or columns in each
- * pass.  This is expressed as a shift - effectively log2 of the number or
- * rows or columns in each 8x8 tile of the original image.
- */
-#define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3)
-#define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3)
-
-/* Hence two macros to determine the number of rows or columns in a given
- * pass of an image given its height or width.  In fact these macros may
- * return non-zero even though the sub-image is empty, because the other
- * dimension may be empty for a small image.
- */
-#define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\
-   -1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass))
-#define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\
-   -1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass))
-
-/* For the reader row callbacks (both progressive and sequential) it is
- * necessary to find the row in the output image given a row in an interlaced
- * image, so two more macros:
- */
-#define PNG_ROW_FROM_PASS_ROW(y_in, pass) \
-   (((y_in)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass))
-#define PNG_COL_FROM_PASS_COL(x_in, pass) \
-   (((x_in)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass))
-
-/* Two macros which return a boolean (0 or 1) saying whether the given row
- * or column is in a particular pass.  These use a common utility macro that
- * returns a mask for a given pass - the offset 'off' selects the row or
- * column version.  The mask has the appropriate bit set for each column in
- * the tile.
- */
-#define PNG_PASS_MASK(pass,off) ( \
-   ((0x110145AF>>(((7-(off))-(pass))<<2)) & 0xF) | \
-   ((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0))
-
-#define PNG_ROW_IN_INTERLACE_PASS(y, pass) \
-   ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1)
-#define PNG_COL_IN_INTERLACE_PASS(x, pass) \
-   ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1)
-
-#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
-/* With these routines we avoid an integer divide, which will be slower on
- * most machines.  However, it does take more operations than the corresponding
- * divide method, so it may be slower on a few RISC systems.  There are two
- * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
- *
- * Note that the rounding factors are NOT supposed to be the same!  128 and
- * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
- * standard method.
- *
- * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
- */
-
- /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
-
-#  define png_composite(composite, fg, alpha, bg)        \
-   {                                                     \
-      png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \
-          * (png_uint_16)(alpha)                         \
-          + (png_uint_16)(bg)*(png_uint_16)(255          \
-          - (png_uint_16)(alpha)) + 128);                \
-      (composite) = (png_byte)(((temp + (temp >> 8)) >> 8) & 0xff); \
-   }
-
-#  define png_composite_16(composite, fg, alpha, bg)     \
-   {                                                     \
-      png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \
-          * (png_uint_32)(alpha)                         \
-          + (png_uint_32)(bg)*(65535                     \
-          - (png_uint_32)(alpha)) + 32768);              \
-      (composite) = (png_uint_16)(0xffff & ((temp + (temp >> 16)) >> 16)); \
-   }
-
-#else  /* Standard method using integer division */
-
-#  define png_composite(composite, fg, alpha, bg)                      \
-   (composite) =                                                       \
-       (png_byte)(0xff & (((png_uint_16)(fg) * (png_uint_16)(alpha) +  \
-       (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
-       127) / 255))
-
-#  define png_composite_16(composite, fg, alpha, bg)                       \
-   (composite) =                                                           \
-       (png_uint_16)(0xffff & (((png_uint_32)(fg) * (png_uint_32)(alpha) + \
-       (png_uint_32)(bg)*(png_uint_32)(65535 - (png_uint_32)(alpha)) +     \
-       32767) / 65535))
-#endif /* READ_COMPOSITE_NODIV */
-
-#ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED
-PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf));
-PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf));
-PNG_EXPORT(203, png_int_32, png_get_int_32, (png_const_bytep buf));
-#endif
-
-PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_const_structrp png_ptr,
-    png_const_bytep buf));
-/* No png_get_int_16 -- may be added if there's a real need for it. */
-
-/* Place a 32-bit number into a buffer in PNG byte order (big-endian). */
-#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED
-PNG_EXPORT(205, void, png_save_uint_32, (png_bytep buf, png_uint_32 i));
-#endif
-#ifdef PNG_SAVE_INT_32_SUPPORTED
-PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i));
-#endif
-
-/* Place a 16-bit number into a buffer in PNG byte order.
- * The parameter is declared unsigned int, not png_uint_16,
- * just to avoid potential problems on pre-ANSI C compilers.
- */
-#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED
-PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));
-/* No png_save_int_16 -- may be added if there's a real need for it. */
-#endif
-
-#ifdef PNG_USE_READ_MACROS
-/* Inline macros to do direct reads of bytes from the input buffer.
- * The png_get_int_32() routine assumes we are using two's complement
- * format for negative values, which is almost certainly true.
- */
-#  define PNG_get_uint_32(buf) \
-   (((png_uint_32)(*(buf)) << 24) + \
-    ((png_uint_32)(*((buf) + 1)) << 16) + \
-    ((png_uint_32)(*((buf) + 2)) << 8) + \
-    ((png_uint_32)(*((buf) + 3))))
-
-   /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
-    * function) incorrectly returned a value of type png_uint_32.
-    */
-#  define PNG_get_uint_16(buf) \
-   ((png_uint_16) \
-    (((unsigned int)(*(buf)) << 8) + \
-    ((unsigned int)(*((buf) + 1)))))
-
-#  define PNG_get_int_32(buf) \
-   ((png_int_32)((*(buf) & 0x80) \
-    ? -((png_int_32)(((png_get_uint_32(buf)^0xffffffffU)+1U)&0x7fffffffU)) \
-    : (png_int_32)png_get_uint_32(buf)))
-
-/* If PNG_PREFIX is defined the same thing as below happens in pnglibconf.h,
- * but defining a macro name prefixed with PNG_PREFIX.
- */
-#  ifndef PNG_PREFIX
-#    define png_get_uint_32(buf) PNG_get_uint_32(buf)
-#    define png_get_uint_16(buf) PNG_get_uint_16(buf)
-#    define png_get_int_32(buf)  PNG_get_int_32(buf)
-#  endif
-#else
-#  ifdef PNG_PREFIX
-   /* No macros; revert to the (redefined) function */
-#    define PNG_get_uint_32 (png_get_uint_32)
-#    define PNG_get_uint_16 (png_get_uint_16)
-#    define PNG_get_int_32  (png_get_int_32)
-#  endif
-#endif
-
-#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
-PNG_EXPORT(242, void, png_set_check_for_invalid_index,
-    (png_structrp png_ptr, int allowed));
-#  ifdef PNG_GET_PALETTE_MAX_SUPPORTED
-PNG_EXPORT(243, int, png_get_palette_max, (png_const_structp png_ptr,
-    png_const_infop info_ptr));
-#  endif
-#endif /* CHECK_FOR_INVALID_INDEX */
-
-/*******************************************************************************
- * Section 5: SIMPLIFIED API
- *******************************************************************************
- *
- * Please read the documentation in libpng-manual.txt (TODO: write said
- * documentation) if you don't understand what follows.
- *
- * The simplified API hides the details of both libpng and the PNG file format
- * itself.  It allows PNG files to be read into a very limited number of
- * in-memory bitmap formats or to be written from the same formats.  If these
- * formats do not accomodate your needs then you can, and should, use the more
- * sophisticated APIs above - these support a wide variety of in-memory formats
- * and a wide variety of sophisticated transformations to those formats as well
- * as a wide variety of APIs to manipulate ancillary information.
- *
- * To read a PNG file using the simplified API:
- *
- * 1) Declare a 'png_image' structure (see below) on the stack, set the
- *    version field to PNG_IMAGE_VERSION and the 'opaque' pointer to NULL
- *    (this is REQUIRED, your program may crash if you don't do it.)
- * 2) Call the appropriate png_image_begin_read... function.
- * 3) Set the png_image 'format' member to the required sample format.
- * 4) Allocate a buffer for the image and, if required, the color-map.
- * 5) Call png_image_finish_read to read the image and, if required, the
- *    color-map into your buffers.
- *
- * There are no restrictions on the format of the PNG input itself; all valid
- * color types, bit depths, and interlace methods are acceptable, and the
- * input image is transformed as necessary to the requested in-memory format
- * during the png_image_finish_read() step.  The only caveat is that if you
- * request a color-mapped image from a PNG that is full-color or makes
- * complex use of an alpha channel the transformation is extremely lossy and the
- * result may look terrible.
- *
- * To write a PNG file using the simplified API:
- *
- * 1) Declare a 'png_image' structure on the stack and memset() it to all zero.
- * 2) Initialize the members of the structure that describe the image, setting
- *    the 'format' member to the format of the image samples.
- * 3) Call the appropriate png_image_write... function with a pointer to the
- *    image and, if necessary, the color-map to write the PNG data.
- *
- * png_image is a structure that describes the in-memory format of an image
- * when it is being read or defines the in-memory format of an image that you
- * need to write:
- */
-#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) || \
-    defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
-
-#define PNG_IMAGE_VERSION 1
-
-typedef struct png_control *png_controlp;
-typedef struct
-{
-   png_controlp opaque;    /* Initialize to NULL, free with png_image_free */
-   png_uint_32  version;   /* Set to PNG_IMAGE_VERSION */
-   png_uint_32  width;     /* Image width in pixels (columns) */
-   png_uint_32  height;    /* Image height in pixels (rows) */
-   png_uint_32  format;    /* Image format as defined below */
-   png_uint_32  flags;     /* A bit mask containing informational flags */
-   png_uint_32  colormap_entries;
-                           /* Number of entries in the color-map */
-
-   /* In the event of an error or warning the following field will be set to a
-    * non-zero value and the 'message' field will contain a '\0' terminated
-    * string with the libpng error or warning message.  If both warnings and
-    * an error were encountered, only the error is recorded.  If there
-    * are multiple warnings, only the first one is recorded.
-    *
-    * The upper 30 bits of this value are reserved, the low two bits contain
-    * a value as follows:
-    */
-#  define PNG_IMAGE_WARNING 1
-#  define PNG_IMAGE_ERROR 2
-   /*
-    * The result is a two-bit code such that a value more than 1 indicates
-    * a failure in the API just called:
-    *
-    *    0 - no warning or error
-    *    1 - warning
-    *    2 - error
-    *    3 - error preceded by warning
-    */
-#  define PNG_IMAGE_FAILED(png_cntrl) ((((png_cntrl).warning_or_error)&0x03)>1)
-
-   png_uint_32  warning_or_error;
-
-   char         message[64];
-} png_image, *png_imagep;
-
-/* The samples of the image have one to four channels whose components have
- * original values in the range 0 to 1.0:
- *
- * 1: A single gray or luminance channel (G).
- * 2: A gray/luminance channel and an alpha channel (GA).
- * 3: Three red, green, blue color channels (RGB).
- * 4: Three color channels and an alpha channel (RGBA).
- *
- * The components are encoded in one of two ways:
- *
- * a) As a small integer, value 0..255, contained in a single byte.  For the
- * alpha channel the original value is simply value/255.  For the color or
- * luminance channels the value is encoded according to the sRGB specification
- * and matches the 8-bit format expected by typical display devices.
- *
- * The color/gray channels are not scaled (pre-multiplied) by the alpha
- * channel and are suitable for passing to color management software.
- *
- * b) As a value in the range 0..65535, contained in a 2-byte integer.  All
- * channels can be converted to the original value by dividing by 65535; all
- * channels are linear.  Color channels use the RGB encoding (RGB end-points) of
- * the sRGB specification.  This encoding is identified by the
- * PNG_FORMAT_FLAG_LINEAR flag below.
- *
- * When the simplified API needs to convert between sRGB and linear colorspaces,
- * the actual sRGB transfer curve defined in the sRGB specification (see the
- * article at https://en.wikipedia.org/wiki/SRGB) is used, not the gamma=1/2.2
- * approximation used elsewhere in libpng.
- *
- * When an alpha channel is present it is expected to denote pixel coverage
- * of the color or luminance channels and is returned as an associated alpha
- * channel: the color/gray channels are scaled (pre-multiplied) by the alpha
- * value.
- *
- * The samples are either contained directly in the image data, between 1 and 8
- * bytes per pixel according to the encoding, or are held in a color-map indexed
- * by bytes in the image data.  In the case of a color-map the color-map entries
- * are individual samples, encoded as above, and the image data has one byte per
- * pixel to select the relevant sample from the color-map.
- */
-
-/* PNG_FORMAT_*
- *
- * #defines to be used in png_image::format.  Each #define identifies a
- * particular layout of sample data and, if present, alpha values.  There are
- * separate defines for each of the two component encodings.
- *
- * A format is built up using single bit flag values.  All combinations are
- * valid.  Formats can be built up from the flag values or you can use one of
- * the predefined values below.  When testing formats always use the FORMAT_FLAG
- * macros to test for individual features - future versions of the library may
- * add new flags.
- *
- * When reading or writing color-mapped images the format should be set to the
- * format of the entries in the color-map then png_image_{read,write}_colormap
- * called to read or write the color-map and set the format correctly for the
- * image data.  Do not set the PNG_FORMAT_FLAG_COLORMAP bit directly!
- *
- * NOTE: libpng can be built with particular features disabled. If you see
- * compiler errors because the definition of one of the following flags has been
- * compiled out it is because libpng does not have the required support.  It is
- * possible, however, for the libpng configuration to enable the format on just
- * read or just write; in that case you may see an error at run time.  You can
- * guard against this by checking for the definition of the appropriate
- * "_SUPPORTED" macro, one of:
- *
- *    PNG_SIMPLIFIED_{READ,WRITE}_{BGR,AFIRST}_SUPPORTED
- */
-#define PNG_FORMAT_FLAG_ALPHA    0x01U /* format with an alpha channel */
-#define PNG_FORMAT_FLAG_COLOR    0x02U /* color format: otherwise grayscale */
-#define PNG_FORMAT_FLAG_LINEAR   0x04U /* 2-byte channels else 1-byte */
-#define PNG_FORMAT_FLAG_COLORMAP 0x08U /* image data is color-mapped */
-
-#ifdef PNG_FORMAT_BGR_SUPPORTED
-#  define PNG_FORMAT_FLAG_BGR    0x10U /* BGR colors, else order is RGB */
-#endif
-
-#ifdef PNG_FORMAT_AFIRST_SUPPORTED
-#  define PNG_FORMAT_FLAG_AFIRST 0x20U /* alpha channel comes first */
-#endif
-
-#define PNG_FORMAT_FLAG_ASSOCIATED_ALPHA 0x40U /* alpha channel is associated */
-
-/* Commonly used formats have predefined macros.
- *
- * First the single byte (sRGB) formats:
- */
-#define PNG_FORMAT_GRAY 0
-#define PNG_FORMAT_GA   PNG_FORMAT_FLAG_ALPHA
-#define PNG_FORMAT_AG   (PNG_FORMAT_GA|PNG_FORMAT_FLAG_AFIRST)
-#define PNG_FORMAT_RGB  PNG_FORMAT_FLAG_COLOR
-#define PNG_FORMAT_BGR  (PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_BGR)
-#define PNG_FORMAT_RGBA (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_ALPHA)
-#define PNG_FORMAT_ARGB (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_AFIRST)
-#define PNG_FORMAT_BGRA (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_ALPHA)
-#define PNG_FORMAT_ABGR (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_AFIRST)
-
-/* Then the linear 2-byte formats.  When naming these "Y" is used to
- * indicate a luminance (gray) channel.
- */
-#define PNG_FORMAT_LINEAR_Y PNG_FORMAT_FLAG_LINEAR
-#define PNG_FORMAT_LINEAR_Y_ALPHA (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_ALPHA)
-#define PNG_FORMAT_LINEAR_RGB (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR)
-#define PNG_FORMAT_LINEAR_RGB_ALPHA \
-   (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA)
-
-/* With color-mapped formats the image data is one byte for each pixel, the byte
- * is an index into the color-map which is formatted as above.  To obtain a
- * color-mapped format it is sufficient just to add the PNG_FOMAT_FLAG_COLORMAP
- * to one of the above definitions, or you can use one of the definitions below.
- */
-#define PNG_FORMAT_RGB_COLORMAP  (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_COLORMAP)
-#define PNG_FORMAT_BGR_COLORMAP  (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_COLORMAP)
-#define PNG_FORMAT_RGBA_COLORMAP (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_COLORMAP)
-#define PNG_FORMAT_ARGB_COLORMAP (PNG_FORMAT_ARGB|PNG_FORMAT_FLAG_COLORMAP)
-#define PNG_FORMAT_BGRA_COLORMAP (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_COLORMAP)
-#define PNG_FORMAT_ABGR_COLORMAP (PNG_FORMAT_ABGR|PNG_FORMAT_FLAG_COLORMAP)
-
-/* PNG_IMAGE macros
- *
- * These are convenience macros to derive information from a png_image
- * structure.  The PNG_IMAGE_SAMPLE_ macros return values appropriate to the
- * actual image sample values - either the entries in the color-map or the
- * pixels in the image.  The PNG_IMAGE_PIXEL_ macros return corresponding values
- * for the pixels and will always return 1 for color-mapped formats.  The
- * remaining macros return information about the rows in the image and the
- * complete image.
- *
- * NOTE: All the macros that take a png_image::format parameter are compile time
- * constants if the format parameter is, itself, a constant.  Therefore these
- * macros can be used in array declarations and case labels where required.
- * Similarly the macros are also pre-processor constants (sizeof is not used) so
- * they can be used in #if tests.
- *
- * First the information about the samples.
- */
-#define PNG_IMAGE_SAMPLE_CHANNELS(fmt)\
-   (((fmt)&(PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA))+1)
-   /* Return the total number of channels in a given format: 1..4 */
-
-#define PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)\
-   ((((fmt) & PNG_FORMAT_FLAG_LINEAR) >> 2)+1)
-   /* Return the size in bytes of a single component of a pixel or color-map
-    * entry (as appropriate) in the image: 1 or 2.
-    */
-
-#define PNG_IMAGE_SAMPLE_SIZE(fmt)\
-   (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt))
-   /* This is the size of the sample data for one sample.  If the image is
-    * color-mapped it is the size of one color-map entry (and image pixels are
-    * one byte in size), otherwise it is the size of one image pixel.
-    */
-
-#define PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(fmt)\
-   (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * 256)
-   /* The maximum size of the color-map required by the format expressed in a
-    * count of components.  This can be used to compile-time allocate a
-    * color-map:
-    *
-    * png_uint_16 colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(linear_fmt)];
-    *
-    * png_byte colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(sRGB_fmt)];
-    *
-    * Alternatively use the PNG_IMAGE_COLORMAP_SIZE macro below to use the
-    * information from one of the png_image_begin_read_ APIs and dynamically
-    * allocate the required memory.
-    */
-
-/* Corresponding information about the pixels */
-#define PNG_IMAGE_PIXEL_(test,fmt)\
-   (((fmt)&PNG_FORMAT_FLAG_COLORMAP)?1:test(fmt))
-
-#define PNG_IMAGE_PIXEL_CHANNELS(fmt)\
-   PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_CHANNELS,fmt)
-   /* The number of separate channels (components) in a pixel; 1 for a
-    * color-mapped image.
-    */
-
-#define PNG_IMAGE_PIXEL_COMPONENT_SIZE(fmt)\
-   PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_COMPONENT_SIZE,fmt)
-   /* The size, in bytes, of each component in a pixel; 1 for a color-mapped
-    * image.
-    */
-
-#define PNG_IMAGE_PIXEL_SIZE(fmt) PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_SIZE,fmt)
-   /* The size, in bytes, of a complete pixel; 1 for a color-mapped image. */
-
-/* Information about the whole row, or whole image */
-#define PNG_IMAGE_ROW_STRIDE(image)\
-   (PNG_IMAGE_PIXEL_CHANNELS((image).format) * (image).width)
-   /* Return the total number of components in a single row of the image; this
-    * is the minimum 'row stride', the minimum count of components between each
-    * row.  For a color-mapped image this is the minimum number of bytes in a
-    * row.
-    *
-    * WARNING: this macro overflows for some images with more than one component
-    * and very large image widths.  libpng will refuse to process an image where
-    * this macro would overflow.
-    */
-
-#define PNG_IMAGE_BUFFER_SIZE(image, row_stride)\
-   (PNG_IMAGE_PIXEL_COMPONENT_SIZE((image).format)*(image).height*(row_stride))
-   /* Return the size, in bytes, of an image buffer given a png_image and a row
-    * stride - the number of components to leave space for in each row.
-    *
-    * WARNING: this macro overflows a 32-bit integer for some large PNG images,
-    * libpng will refuse to process an image where such an overflow would occur.
-    */
-
-#define PNG_IMAGE_SIZE(image)\
-   PNG_IMAGE_BUFFER_SIZE(image, PNG_IMAGE_ROW_STRIDE(image))
-   /* Return the size, in bytes, of the image in memory given just a png_image;
-    * the row stride is the minimum stride required for the image.
-    */
-
-#define PNG_IMAGE_COLORMAP_SIZE(image)\
-   (PNG_IMAGE_SAMPLE_SIZE((image).format) * (image).colormap_entries)
-   /* Return the size, in bytes, of the color-map of this image.  If the image
-    * format is not a color-map format this will return a size sufficient for
-    * 256 entries in the given format; check PNG_FORMAT_FLAG_COLORMAP if
-    * you don't want to allocate a color-map in this case.
-    */
-
-/* PNG_IMAGE_FLAG_*
- *
- * Flags containing additional information about the image are held in the
- * 'flags' field of png_image.
- */
-#define PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB 0x01
-   /* This indicates the the RGB values of the in-memory bitmap do not
-    * correspond to the red, green and blue end-points defined by sRGB.
-    */
-
-#define PNG_IMAGE_FLAG_FAST 0x02
-   /* On write emphasise speed over compression; the resultant PNG file will be
-    * larger but will be produced significantly faster, particular for large
-    * images.  Do not use this option for images which will be distributed, only
-    * used it when producing intermediate files that will be read back in
-    * repeatedly.  For a typical 24-bit image the option will double the read
-    * speed at the cost of increasing the image size by 25%, however for many
-    * more compressible images the PNG file can be 10 times larger with only a
-    * slight speed gain.
-    */
-
-#define PNG_IMAGE_FLAG_16BIT_sRGB 0x04
-   /* On read if the image is a 16-bit per component image and there is no gAMA
-    * or sRGB chunk assume that the components are sRGB encoded.  Notice that
-    * images output by the simplified API always have gamma information; setting
-    * this flag only affects the interpretation of 16-bit images from an
-    * external source.  It is recommended that the application expose this flag
-    * to the user; the user can normally easily recognize the difference between
-    * linear and sRGB encoding.  This flag has no effect on write - the data
-    * passed to the write APIs must have the correct encoding (as defined
-    * above.)
-    *
-    * If the flag is not set (the default) input 16-bit per component data is
-    * assumed to be linear.
-    *
-    * NOTE: the flag can only be set after the png_image_begin_read_ call,
-    * because that call initializes the 'flags' field.
-    */
-
-#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
-/* READ APIs
- * ---------
- *
- * The png_image passed to the read APIs must have been initialized by setting
- * the png_controlp field 'opaque' to NULL (or, safer, memset the whole thing.)
- */
-#ifdef PNG_STDIO_SUPPORTED
-PNG_EXPORT(234, int, png_image_begin_read_from_file, (png_imagep image,
-   const char *file_name));
-   /* The named file is opened for read and the image header is filled in
-    * from the PNG header in the file.
-    */
-
-PNG_EXPORT(235, int, png_image_begin_read_from_stdio, (png_imagep image,
-   FILE* file));
-   /* The PNG header is read from the stdio FILE object. */
-#endif /* STDIO */
-
-PNG_EXPORT(236, int, png_image_begin_read_from_memory, (png_imagep image,
-   png_const_voidp memory, png_size_t size));
-   /* The PNG header is read from the given memory buffer. */
-
-PNG_EXPORT(237, int, png_image_finish_read, (png_imagep image,
-   png_const_colorp background, void *buffer, png_int_32 row_stride,
-   void *colormap));
-   /* Finish reading the image into the supplied buffer and clean up the
-    * png_image structure.
-    *
-    * row_stride is the step, in byte or 2-byte units as appropriate,
-    * between adjacent rows.  A positive stride indicates that the top-most row
-    * is first in the buffer - the normal top-down arrangement.  A negative
-    * stride indicates that the bottom-most row is first in the buffer.
-    *
-    * background need only be supplied if an alpha channel must be removed from
-    * a png_byte format and the removal is to be done by compositing on a solid
-    * color; otherwise it may be NULL and any composition will be done directly
-    * onto the buffer.  The value is an sRGB color to use for the background,
-    * for grayscale output the green channel is used.
-    *
-    * background must be supplied when an alpha channel must be removed from a
-    * single byte color-mapped output format, in other words if:
-    *
-    * 1) The original format from png_image_begin_read_from_* had
-    *    PNG_FORMAT_FLAG_ALPHA set.
-    * 2) The format set by the application does not.
-    * 3) The format set by the application has PNG_FORMAT_FLAG_COLORMAP set and
-    *    PNG_FORMAT_FLAG_LINEAR *not* set.
-    *
-    * For linear output removing the alpha channel is always done by compositing
-    * on black and background is ignored.
-    *
-    * colormap must be supplied when PNG_FORMAT_FLAG_COLORMAP is set.  It must
-    * be at least the size (in bytes) returned by PNG_IMAGE_COLORMAP_SIZE.
-    * image->colormap_entries will be updated to the actual number of entries
-    * written to the colormap; this may be less than the original value.
-    */
-
-PNG_EXPORT(238, void, png_image_free, (png_imagep image));
-   /* Free any data allocated by libpng in image->opaque, setting the pointer to
-    * NULL.  May be called at any time after the structure is initialized.
-    */
-#endif /* SIMPLIFIED_READ */
-
-#ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED
-/* WRITE APIS
- * ----------
- * For write you must initialize a png_image structure to describe the image to
- * be written.  To do this use memset to set the whole structure to 0 then
- * initialize fields describing your image.
- *
- * version: must be set to PNG_IMAGE_VERSION
- * opaque: must be initialized to NULL
- * width: image width in pixels
- * height: image height in rows
- * format: the format of the data (image and color-map) you wish to write
- * flags: set to 0 unless one of the defined flags applies; set
- *    PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB for color format images where the RGB
- *    values do not correspond to the colors in sRGB.
- * colormap_entries: set to the number of entries in the color-map (0 to 256)
- */
-#ifdef PNG_SIMPLIFIED_WRITE_STDIO_SUPPORTED
-PNG_EXPORT(239, int, png_image_write_to_file, (png_imagep image,
-   const char *file, int convert_to_8bit, const void *buffer,
-   png_int_32 row_stride, const void *colormap));
-   /* Write the image to the named file. */
-
-PNG_EXPORT(240, int, png_image_write_to_stdio, (png_imagep image, FILE *file,
-   int convert_to_8_bit, const void *buffer, png_int_32 row_stride,
-   const void *colormap));
-   /* Write the image to the given (FILE*). */
-#endif /* SIMPLIFIED_WRITE_STDIO */
-
-/* With all write APIs if image is in one of the linear formats with 16-bit
- * data then setting convert_to_8_bit will cause the output to be an 8-bit PNG
- * gamma encoded according to the sRGB specification, otherwise a 16-bit linear
- * encoded PNG file is written.
- *
- * With color-mapped data formats the colormap parameter point to a color-map
- * with at least image->colormap_entries encoded in the specified format.  If
- * the format is linear the written PNG color-map will be converted to sRGB
- * regardless of the convert_to_8_bit flag.
- *
- * With all APIs row_stride is handled as in the read APIs - it is the spacing
- * from one row to the next in component sized units (1 or 2 bytes) and if
- * negative indicates a bottom-up row layout in the buffer.  If row_stride is
- * zero, libpng will calculate it for you from the image width and number of
- * channels.
- *
- * Note that the write API does not support interlacing, sub-8-bit pixels or
- * most ancillary chunks.  If you need to write text chunks (e.g. for copyright
- * notices) you need to use one of the other APIs.
- */
-
-PNG_EXPORT(245, int, png_image_write_to_memory, (png_imagep image, void *memory,
-   png_alloc_size_t * PNG_RESTRICT memory_bytes, int convert_to_8_bit,
-   const void *buffer, png_int_32 row_stride, const void *colormap));
-   /* Write the image to the given memory buffer.  The function both writes the
-    * whole PNG data stream to *memory and updates *memory_bytes with the count
-    * of bytes written.
-    *
-    * 'memory' may be NULL.  In this case *memory_bytes is not read however on
-    * success the number of bytes which would have been written will still be
-    * stored in *memory_bytes.  On failure *memory_bytes will contain 0.
-    *
-    * If 'memory' is not NULL it must point to memory[*memory_bytes] of
-    * writeable memory.
-    *
-    * If the function returns success memory[*memory_bytes] (if 'memory' is not
-    * NULL) contains the written PNG data.  *memory_bytes will always be less
-    * than or equal to the original value.
-    *
-    * If the function returns false and *memory_bytes was not changed an error
-    * occured during write.  If *memory_bytes was changed, or is not 0 if
-    * 'memory' was NULL, the write would have succeeded but for the memory
-    * buffer being too small.  *memory_bytes contains the required number of
-    * bytes and will be bigger that the original value.
-    */
-
-#define png_image_write_get_memory_size(image, size, convert_to_8_bit, buffer,\
-   row_stride, colormap)\
-   png_image_write_to_memory(&(image), 0, &(size), convert_to_8_bit, buffer,\
-         row_stride, colormap)
-   /* Return the amount of memory in 'size' required to compress this image.
-    * The png_image structure 'image' must be filled in as in the above
-    * function and must not be changed before the actual write call, the buffer
-    * and all other parameters must also be identical to that in the final
-    * write call.  The 'size' variable need not be initialized.
-    *
-    * NOTE: the macro returns true/false, if false is returned 'size' will be
-    * set to zero and the write failed and probably will fail if tried again.
-    */
-
-/* You can pre-allocate the buffer by making sure it is of sufficient size
- * regardless of the amount of compression achieved.  The buffer size will
- * always be bigger than the original image and it will never be filled.  The
- * following macros are provided to assist in allocating the buffer.
- */
-#define PNG_IMAGE_DATA_SIZE(image) (PNG_IMAGE_SIZE(image)+(image).height)
-   /* The number of uncompressed bytes in the PNG byte encoding of the image;
-    * uncompressing the PNG IDAT data will give this number of bytes.
-    *
-    * NOTE: while PNG_IMAGE_SIZE cannot overflow for an image in memory this
-    * macro can because of the extra bytes used in the PNG byte encoding.  You
-    * need to avoid this macro if your image size approaches 2^30 in width or
-    * height.  The same goes for the remainder of these macros; they all produce
-    * bigger numbers than the actual in-memory image size.
-    */
-#ifndef PNG_ZLIB_MAX_SIZE
-#  define PNG_ZLIB_MAX_SIZE(b) ((b)+(((b)+7U)>>3)+(((b)+63U)>>6)+11U)
-   /* An upper bound on the number of compressed bytes given 'b' uncompressed
-    * bytes.  This is based on deflateBounds() in zlib; different
-    * implementations of zlib compression may conceivably produce more data so
-    * if your zlib implementation is not zlib itself redefine this macro
-    * appropriately.
-    */
-#endif
-
-#define PNG_IMAGE_COMPRESSED_SIZE_MAX(image)\
-   PNG_ZLIB_MAX_SIZE((png_alloc_size_t)PNG_IMAGE_DATA_SIZE(image))
-   /* An upper bound on the size of the data in the PNG IDAT chunks. */
-
-#define PNG_IMAGE_PNG_SIZE_MAX_(image, image_size)\
-   ((8U/*sig*/+25U/*IHDR*/+16U/*gAMA*/+44U/*cHRM*/+12U/*IEND*/+\
-    (((image).format&PNG_FORMAT_FLAG_COLORMAP)?/*colormap: PLTE, tRNS*/\
-    12U+3U*(image).colormap_entries/*PLTE data*/+\
-    (((image).format&PNG_FORMAT_FLAG_ALPHA)?\
-    12U/*tRNS*/+(image).colormap_entries:0U):0U)+\
-    12U)+(12U*((image_size)/PNG_ZBUF_SIZE))/*IDAT*/+(image_size))
-   /* A helper for the following macro; if your compiler cannot handle the
-    * following macro use this one with the result of
-    * PNG_IMAGE_COMPRESSED_SIZE_MAX(image) as the second argument (most
-    * compilers should handle this just fine.)
-    */
-
-#define PNG_IMAGE_PNG_SIZE_MAX(image)\
-   PNG_IMAGE_PNG_SIZE_MAX_(image, PNG_IMAGE_COMPRESSED_SIZE_MAX(image))
-   /* An upper bound on the total length of the PNG data stream for 'image'.
-    * The result is of type png_alloc_size_t, on 32-bit systems this may
-    * overflow even though PNG_IMAGE_DATA_SIZE does not overflow; the write will
-    * run out of buffer space but return a corrected size which should work.
-    */
-#endif /* SIMPLIFIED_WRITE */
-/*******************************************************************************
- *  END OF SIMPLIFIED API
- ******************************************************************************/
-#endif /* SIMPLIFIED_{READ|WRITE} */
-
-/*******************************************************************************
- * Section 6: IMPLEMENTATION OPTIONS
- *******************************************************************************
- *
- * Support for arbitrary implementation-specific optimizations.  The API allows
- * particular options to be turned on or off.  'Option' is the number of the
- * option and 'onoff' is 0 (off) or non-0 (on).  The value returned is given
- * by the PNG_OPTION_ defines below.
- *
- * HARDWARE: normally hardware capabilites, such as the Intel SSE instructions,
- *           are detected at run time, however sometimes it may be impossible
- *           to do this in user mode, in which case it is necessary to discover
- *           the capabilities in an OS specific way.  Such capabilities are
- *           listed here when libpng has support for them and must be turned
- *           ON by the application if present.
- *
- * SOFTWARE: sometimes software optimizations actually result in performance
- *           decrease on some architectures or systems, or with some sets of
- *           PNG images.  'Software' options allow such optimizations to be
- *           selected at run time.
- */
-#ifdef PNG_SET_OPTION_SUPPORTED
-#ifdef PNG_ARM_NEON_API_SUPPORTED
-#  define PNG_ARM_NEON   0 /* HARDWARE: ARM Neon SIMD instructions supported */
-#endif
-#define PNG_MAXIMUM_INFLATE_WINDOW 2 /* SOFTWARE: force maximum window */
-#define PNG_SKIP_sRGB_CHECK_PROFILE 4 /* SOFTWARE: Check ICC profile for sRGB */
-#ifdef PNG_MIPS_MSA_API_SUPPORTED
-#  define PNG_MIPS_MSA   6 /* HARDWARE: MIPS Msa SIMD instructions supported */
-#endif
-#define PNG_IGNORE_ADLER32 8
-#ifdef PNG_POWERPC_VSX_API_SUPPORTED
-#  define PNG_POWERPC_VSX   10 /* HARDWARE: PowerPC VSX SIMD instructions supported */
-#endif
-#define PNG_OPTION_NEXT  12 /* Next option - numbers must be even */
-
-/* Return values: NOTE: there are four values and 'off' is *not* zero */
-#define PNG_OPTION_UNSET   0 /* Unset - defaults to off */
-#define PNG_OPTION_INVALID 1 /* Option number out of range */
-#define PNG_OPTION_OFF     2
-#define PNG_OPTION_ON      3
-
-PNG_EXPORT(244, int, png_set_option, (png_structrp png_ptr, int option,
-   int onoff));
-#endif /* SET_OPTION */
-
-/*******************************************************************************
- *  END OF HARDWARE AND SOFTWARE OPTIONS
- ******************************************************************************/
-
-/* Maintainer: Put new public prototypes here ^, in libpng.3, in project
- * defs, and in scripts/symbols.def.
- */
-
-/* The last ordinal number (this is the *last* one already used; the next
- * one to use is one more than this.)
- */
-#ifdef PNG_EXPORT_LAST_ORDINAL
-  PNG_EXPORT_LAST_ORDINAL(249);
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* PNG_VERSION_INFO_ONLY */
-/* Do not put anything past this line */
-#endif /* PNG_H */
diff --git a/src/png/libpng/pngconf.h b/src/png/libpng/pngconf.h
deleted file mode 100644
index d13b13e57..000000000
--- a/src/png/libpng/pngconf.h
+++ /dev/null
@@ -1,622 +0,0 @@
-
-/* pngconf.h - machine configurable file for libpng
- *
- * libpng version 1.6.34, September 29, 2017
- *
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * Any machine specific code is near the front of this file, so if you
- * are configuring libpng for a machine, you may want to read the section
- * starting here down to where it starts to typedef png_color, png_text,
- * and png_info.
- */
-
-#ifndef PNGCONF_H
-#define PNGCONF_H
-
-#ifndef PNG_BUILDING_SYMBOL_TABLE /* else includes may cause problems */
-
-/* From libpng 1.6.0 libpng requires an ANSI X3.159-1989 ("ISOC90") compliant C
- * compiler for correct compilation.  The following header files are required by
- * the standard.  If your compiler doesn't provide these header files, or they
- * do not match the standard, you will need to provide/improve them.
- */
-#include <limits.h>
-#include <stddef.h>
-
-/* Library header files.  These header files are all defined by ISOC90; libpng
- * expects conformant implementations, however, an ISOC90 conformant system need
- * not provide these header files if the functionality cannot be implemented.
- * In this case it will be necessary to disable the relevant parts of libpng in
- * the build of pnglibconf.h.
- *
- * Prior to 1.6.0 string.h was included here; the API changes in 1.6.0 to not
- * include this unnecessary header file.
- */
-
-#ifdef PNG_STDIO_SUPPORTED
-   /* Required for the definition of FILE: */
-#  include <stdio.h>
-#endif
-
-#ifdef PNG_SETJMP_SUPPORTED
-   /* Required for the definition of jmp_buf and the declaration of longjmp: */
-#  include <setjmp.h>
-#endif
-
-#ifdef PNG_CONVERT_tIME_SUPPORTED
-   /* Required for struct tm: */
-#  include <time.h>
-#endif
-
-#endif /* PNG_BUILDING_SYMBOL_TABLE */
-
-/* Prior to 1.6.0 it was possible to turn off 'const' in declarations using
- * PNG_NO_CONST; this is no longer supported except for data declarations which
- * apparently still cause problems in 2011 on some compilers.
- */
-#define PNG_CONST const /* backward compatibility only */
-
-/* This controls optimization of the reading of 16-bit and 32-bit values
- * from PNG files.  It can be set on a per-app-file basis - it
- * just changes whether a macro is used when the function is called.
- * The library builder sets the default; if read functions are not
- * built into the library the macro implementation is forced on.
- */
-#ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED
-#  define PNG_USE_READ_MACROS
-#endif
-#if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS)
-#  if PNG_DEFAULT_READ_MACROS
-#    define PNG_USE_READ_MACROS
-#  endif
-#endif
-
-/* COMPILER SPECIFIC OPTIONS.
- *
- * These options are provided so that a variety of difficult compilers
- * can be used.  Some are fixed at build time (e.g. PNG_API_RULE
- * below) but still have compiler specific implementations, others
- * may be changed on a per-file basis when compiling against libpng.
- */
-
-/* The PNGARG macro was used in versions of libpng prior to 1.6.0 to protect
- * against legacy (pre ISOC90) compilers that did not understand function
- * prototypes.  It is not required for modern C compilers.
- */
-#ifndef PNGARG
-#  define PNGARG(arglist) arglist
-#endif
-
-/* Function calling conventions.
- * =============================
- * Normally it is not necessary to specify to the compiler how to call
- * a function - it just does it - however on x86 systems derived from
- * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems
- * and some others) there are multiple ways to call a function and the
- * default can be changed on the compiler command line.  For this reason
- * libpng specifies the calling convention of every exported function and
- * every function called via a user supplied function pointer.  This is
- * done in this file by defining the following macros:
- *
- * PNGAPI    Calling convention for exported functions.
- * PNGCBAPI  Calling convention for user provided (callback) functions.
- * PNGCAPI   Calling convention used by the ANSI-C library (required
- *           for longjmp callbacks and sometimes used internally to
- *           specify the calling convention for zlib).
- *
- * These macros should never be overridden.  If it is necessary to
- * change calling convention in a private build this can be done
- * by setting PNG_API_RULE (which defaults to 0) to one of the values
- * below to select the correct 'API' variants.
- *
- * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout.
- *                This is correct in every known environment.
- * PNG_API_RULE=1 Use the operating system convention for PNGAPI and
- *                the 'C' calling convention (from PNGCAPI) for
- *                callbacks (PNGCBAPI).  This is no longer required
- *                in any known environment - if it has to be used
- *                please post an explanation of the problem to the
- *                libpng mailing list.
- *
- * These cases only differ if the operating system does not use the C
- * calling convention, at present this just means the above cases
- * (x86 DOS/Windows sytems) and, even then, this does not apply to
- * Cygwin running on those systems.
- *
- * Note that the value must be defined in pnglibconf.h so that what
- * the application uses to call the library matches the conventions
- * set when building the library.
- */
-
-/* Symbol export
- * =============
- * When building a shared library it is almost always necessary to tell
- * the compiler which symbols to export.  The png.h macro 'PNG_EXPORT'
- * is used to mark the symbols.  On some systems these symbols can be
- * extracted at link time and need no special processing by the compiler,
- * on other systems the symbols are flagged by the compiler and just
- * the declaration requires a special tag applied (unfortunately) in a
- * compiler dependent way.  Some systems can do either.
- *
- * A small number of older systems also require a symbol from a DLL to
- * be flagged to the program that calls it.  This is a problem because
- * we do not know in the header file included by application code that
- * the symbol will come from a shared library, as opposed to a statically
- * linked one.  For this reason the application must tell us by setting
- * the magic flag PNG_USE_DLL to turn on the special processing before
- * it includes png.h.
- *
- * Four additional macros are used to make this happen:
- *
- * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from
- *            the build or imported if PNG_USE_DLL is set - compiler
- *            and system specific.
- *
- * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to
- *                       'type', compiler specific.
- *
- * PNG_DLL_EXPORT Set to the magic to use during a libpng build to
- *                make a symbol exported from the DLL.  Not used in the
- *                public header files; see pngpriv.h for how it is used
- *                in the libpng build.
- *
- * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come
- *                from a DLL - used to define PNG_IMPEXP when
- *                PNG_USE_DLL is set.
- */
-
-/* System specific discovery.
- * ==========================
- * This code is used at build time to find PNG_IMPEXP, the API settings
- * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL
- * import processing is possible.  On Windows systems it also sets
- * compiler-specific macros to the values required to change the calling
- * conventions of the various functions.
- */
-#if defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\
-    defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
-  /* Windows system (DOS doesn't support DLLs).  Includes builds under Cygwin or
-   * MinGW on any architecture currently supported by Windows.  Also includes
-   * Watcom builds but these need special treatment because they are not
-   * compatible with GCC or Visual C because of different calling conventions.
-   */
-#  if PNG_API_RULE == 2
-   /* If this line results in an error, either because __watcall is not
-    * understood or because of a redefine just below you cannot use *this*
-    * build of the library with the compiler you are using.  *This* build was
-    * build using Watcom and applications must also be built using Watcom!
-    */
-#    define PNGCAPI __watcall
-#  endif
-
-#  if defined(__GNUC__) || (defined(_MSC_VER) && (_MSC_VER >= 800))
-#    define PNGCAPI __cdecl
-#    if PNG_API_RULE == 1
-   /* If this line results in an error __stdcall is not understood and
-    * PNG_API_RULE should not have been set to '1'.
-    */
-#      define PNGAPI __stdcall
-#    endif
-#  else
-   /* An older compiler, or one not detected (erroneously) above,
-    * if necessary override on the command line to get the correct
-    * variants for the compiler.
-    */
-#    ifndef PNGCAPI
-#      define PNGCAPI _cdecl
-#    endif
-#    if PNG_API_RULE == 1 && !defined(PNGAPI)
-#      define PNGAPI _stdcall
-#    endif
-#  endif /* compiler/api */
-
-  /* NOTE: PNGCBAPI always defaults to PNGCAPI. */
-
-#  if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD)
-#     error "PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed"
-#  endif
-
-#  if (defined(_MSC_VER) && _MSC_VER < 800) ||\
-      (defined(__BORLANDC__) && __BORLANDC__ < 0x500)
-   /* older Borland and MSC
-    * compilers used '__export' and required this to be after
-    * the type.
-    */
-#    ifndef PNG_EXPORT_TYPE
-#      define PNG_EXPORT_TYPE(type) type PNG_IMPEXP
-#    endif
-#    define PNG_DLL_EXPORT __export
-#  else /* newer compiler */
-#    define PNG_DLL_EXPORT __declspec(dllexport)
-#    ifndef PNG_DLL_IMPORT
-#      define PNG_DLL_IMPORT __declspec(dllimport)
-#    endif
-#  endif /* compiler */
-
-#else /* !Windows */
-#  if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
-#    define PNGAPI _System
-#  else /* !Windows/x86 && !OS/2 */
-   /* Use the defaults, or define PNG*API on the command line (but
-    * this will have to be done for every compile!)
-    */
-#  endif /* other system, !OS/2 */
-#endif /* !Windows/x86 */
-
-/* Now do all the defaulting . */
-#ifndef PNGCAPI
-#  define PNGCAPI
-#endif
-#ifndef PNGCBAPI
-#  define PNGCBAPI PNGCAPI
-#endif
-#ifndef PNGAPI
-#  define PNGAPI PNGCAPI
-#endif
-
-/* PNG_IMPEXP may be set on the compilation system command line or (if not set)
- * then in an internal header file when building the library, otherwise (when
- * using the library) it is set here.
- */
-#ifndef PNG_IMPEXP
-#  if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT)
-   /* This forces use of a DLL, disallowing static linking */
-#    define PNG_IMPEXP PNG_DLL_IMPORT
-#  endif
-
-#  ifndef PNG_IMPEXP
-#    define PNG_IMPEXP
-#  endif
-#endif
-
-/* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat
- * 'attributes' as a storage class - the attributes go at the start of the
- * function definition, and attributes are always appended regardless of the
- * compiler.  This considerably simplifies these macros but may cause problems
- * if any compilers both need function attributes and fail to handle them as
- * a storage class (this is unlikely.)
- */
-#ifndef PNG_FUNCTION
-#  define PNG_FUNCTION(type, name, args, attributes) attributes type name args
-#endif
-
-#ifndef PNG_EXPORT_TYPE
-#  define PNG_EXPORT_TYPE(type) PNG_IMPEXP type
-#endif
-
-   /* The ordinal value is only relevant when preprocessing png.h for symbol
-    * table entries, so we discard it here.  See the .dfn files in the
-    * scripts directory.
-    */
-
-#ifndef PNG_EXPORTA
-#  define PNG_EXPORTA(ordinal, type, name, args, attributes) \
-      PNG_FUNCTION(PNG_EXPORT_TYPE(type), (PNGAPI name), PNGARG(args), \
-      PNG_LINKAGE_API attributes)
-#endif
-
-/* ANSI-C (C90) does not permit a macro to be invoked with an empty argument,
- * so make something non-empty to satisfy the requirement:
- */
-#define PNG_EMPTY /*empty list*/
-
-#define PNG_EXPORT(ordinal, type, name, args) \
-   PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY)
-
-/* Use PNG_REMOVED to comment out a removed interface. */
-#ifndef PNG_REMOVED
-#  define PNG_REMOVED(ordinal, type, name, args, attributes)
-#endif
-
-#ifndef PNG_CALLBACK
-#  define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args)
-#endif
-
-/* Support for compiler specific function attributes.  These are used
- * so that where compiler support is available incorrect use of API
- * functions in png.h will generate compiler warnings.
- *
- * Added at libpng-1.2.41.
- */
-
-#ifndef PNG_NO_PEDANTIC_WARNINGS
-#  ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
-#    define PNG_PEDANTIC_WARNINGS_SUPPORTED
-#  endif
-#endif
-
-#ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
-  /* Support for compiler specific function attributes.  These are used
-   * so that where compiler support is available, incorrect use of API
-   * functions in png.h will generate compiler warnings.  Added at libpng
-   * version 1.2.41.  Disabling these removes the warnings but may also produce
-   * less efficient code.
-   */
-#  if defined(__clang__) && defined(__has_attribute)
-   /* Clang defines both __clang__ and __GNUC__. Check __clang__ first. */
-#    if !defined(PNG_USE_RESULT) && __has_attribute(__warn_unused_result__)
-#      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
-#    endif
-#    if !defined(PNG_NORETURN) && __has_attribute(__noreturn__)
-#      define PNG_NORETURN __attribute__((__noreturn__))
-#    endif
-#    if !defined(PNG_ALLOCATED) && __has_attribute(__malloc__)
-#      define PNG_ALLOCATED __attribute__((__malloc__))
-#    endif
-#    if !defined(PNG_DEPRECATED) && __has_attribute(__deprecated__)
-#      define PNG_DEPRECATED __attribute__((__deprecated__))
-#    endif
-#    if !defined(PNG_PRIVATE)
-#      ifdef __has_extension
-#        if __has_extension(attribute_unavailable_with_message)
-#          define PNG_PRIVATE __attribute__((__unavailable__(\
-             "This function is not exported by libpng.")))
-#        endif
-#      endif
-#    endif
-#    ifndef PNG_RESTRICT
-#      define PNG_RESTRICT __restrict
-#    endif
-
-#  elif defined(__GNUC__)
-#    ifndef PNG_USE_RESULT
-#      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
-#    endif
-#    ifndef PNG_NORETURN
-#      define PNG_NORETURN   __attribute__((__noreturn__))
-#    endif
-#    if __GNUC__ >= 3
-#      ifndef PNG_ALLOCATED
-#        define PNG_ALLOCATED  __attribute__((__malloc__))
-#      endif
-#      ifndef PNG_DEPRECATED
-#        define PNG_DEPRECATED __attribute__((__deprecated__))
-#      endif
-#      ifndef PNG_PRIVATE
-#        if 0 /* Doesn't work so we use deprecated instead*/
-#          define PNG_PRIVATE \
-            __attribute__((warning("This function is not exported by libpng.")))
-#        else
-#          define PNG_PRIVATE \
-            __attribute__((__deprecated__))
-#        endif
-#      endif
-#      if ((__GNUC__ > 3) || !defined(__GNUC_MINOR__) || (__GNUC_MINOR__ >= 1))
-#        ifndef PNG_RESTRICT
-#          define PNG_RESTRICT __restrict
-#        endif
-#      endif /* __GNUC__.__GNUC_MINOR__ > 3.0 */
-#    endif /* __GNUC__ >= 3 */
-
-#  elif defined(_MSC_VER)  && (_MSC_VER >= 1300)
-#    ifndef PNG_USE_RESULT
-#      define PNG_USE_RESULT /* not supported */
-#    endif
-#    ifndef PNG_NORETURN
-#      define PNG_NORETURN   __declspec(noreturn)
-#    endif
-#    ifndef PNG_ALLOCATED
-#      if (_MSC_VER >= 1400)
-#        define PNG_ALLOCATED __declspec(restrict)
-#      endif
-#    endif
-#    ifndef PNG_DEPRECATED
-#      define PNG_DEPRECATED __declspec(deprecated)
-#    endif
-#    ifndef PNG_PRIVATE
-#      define PNG_PRIVATE __declspec(deprecated)
-#    endif
-#    ifndef PNG_RESTRICT
-#      if (_MSC_VER >= 1400)
-#        define PNG_RESTRICT __restrict
-#      endif
-#    endif
-
-#  elif defined(__WATCOMC__)
-#    ifndef PNG_RESTRICT
-#      define PNG_RESTRICT __restrict
-#    endif
-#  endif
-#endif /* PNG_PEDANTIC_WARNINGS */
-
-#ifndef PNG_DEPRECATED
-#  define PNG_DEPRECATED  /* Use of this function is deprecated */
-#endif
-#ifndef PNG_USE_RESULT
-#  define PNG_USE_RESULT  /* The result of this function must be checked */
-#endif
-#ifndef PNG_NORETURN
-#  define PNG_NORETURN    /* This function does not return */
-#endif
-#ifndef PNG_ALLOCATED
-#  define PNG_ALLOCATED   /* The result of the function is new memory */
-#endif
-#ifndef PNG_PRIVATE
-#  define PNG_PRIVATE     /* This is a private libpng function */
-#endif
-#ifndef PNG_RESTRICT
-#  define PNG_RESTRICT    /* The C99 "restrict" feature */
-#endif
-
-#ifndef PNG_FP_EXPORT     /* A floating point API. */
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-#     define PNG_FP_EXPORT(ordinal, type, name, args)\
-         PNG_EXPORT(ordinal, type, name, args);
-#  else                   /* No floating point APIs */
-#     define PNG_FP_EXPORT(ordinal, type, name, args)
-#  endif
-#endif
-#ifndef PNG_FIXED_EXPORT  /* A fixed point API. */
-#  ifdef PNG_FIXED_POINT_SUPPORTED
-#     define PNG_FIXED_EXPORT(ordinal, type, name, args)\
-         PNG_EXPORT(ordinal, type, name, args);
-#  else                   /* No fixed point APIs */
-#     define PNG_FIXED_EXPORT(ordinal, type, name, args)
-#  endif
-#endif
-
-#ifndef PNG_BUILDING_SYMBOL_TABLE
-/* Some typedefs to get us started.  These should be safe on most of the common
- * platforms.
- *
- * png_uint_32 and png_int_32 may, currently, be larger than required to hold a
- * 32-bit value however this is not normally advisable.
- *
- * png_uint_16 and png_int_16 should always be two bytes in size - this is
- * verified at library build time.
- *
- * png_byte must always be one byte in size.
- *
- * The checks below use constants from limits.h, as defined by the ISOC90
- * standard.
- */
-#if CHAR_BIT == 8 && UCHAR_MAX == 255
-   typedef unsigned char png_byte;
-#else
-#  error "libpng requires 8-bit bytes"
-#endif
-
-#if INT_MIN == -32768 && INT_MAX == 32767
-   typedef int png_int_16;
-#elif SHRT_MIN == -32768 && SHRT_MAX == 32767
-   typedef short png_int_16;
-#else
-#  error "libpng requires a signed 16-bit type"
-#endif
-
-#if UINT_MAX == 65535
-   typedef unsigned int png_uint_16;
-#elif USHRT_MAX == 65535
-   typedef unsigned short png_uint_16;
-#else
-#  error "libpng requires an unsigned 16-bit type"
-#endif
-
-#if INT_MIN < -2147483646 && INT_MAX > 2147483646
-   typedef int png_int_32;
-#elif LONG_MIN < -2147483646 && LONG_MAX > 2147483646
-   typedef long int png_int_32;
-#else
-#  error "libpng requires a signed 32-bit (or more) type"
-#endif
-
-#if UINT_MAX > 4294967294U
-   typedef unsigned int png_uint_32;
-#elif ULONG_MAX > 4294967294U
-   typedef unsigned long int png_uint_32;
-#else
-#  error "libpng requires an unsigned 32-bit (or more) type"
-#endif
-
-/* Prior to 1.6.0 it was possible to disable the use of size_t, 1.6.0, however,
- * requires an ISOC90 compiler and relies on consistent behavior of sizeof.
- */
-typedef size_t png_size_t;
-typedef ptrdiff_t png_ptrdiff_t;
-
-/* libpng needs to know the maximum value of 'size_t' and this controls the
- * definition of png_alloc_size_t, below.  This maximum value of size_t limits
- * but does not control the maximum allocations the library makes - there is
- * direct application control of this through png_set_user_limits().
- */
-#ifndef PNG_SMALL_SIZE_T
-   /* Compiler specific tests for systems where size_t is known to be less than
-    * 32 bits (some of these systems may no longer work because of the lack of
-    * 'far' support; see above.)
-    */
-#  if (defined(__TURBOC__) && !defined(__FLAT__)) ||\
-   (defined(_MSC_VER) && defined(MAXSEG_64K))
-#     define PNG_SMALL_SIZE_T
-#  endif
-#endif
-
-/* png_alloc_size_t is guaranteed to be no smaller than png_size_t, and no
- * smaller than png_uint_32.  Casts from png_size_t or png_uint_32 to
- * png_alloc_size_t are not necessary; in fact, it is recommended not to use
- * them at all so that the compiler can complain when something turns out to be
- * problematic.
- *
- * Casts in the other direction (from png_alloc_size_t to png_size_t or
- * png_uint_32) should be explicitly applied; however, we do not expect to
- * encounter practical situations that require such conversions.
- *
- * PNG_SMALL_SIZE_T must be defined if the maximum value of size_t is less than
- * 4294967295 - i.e. less than the maximum value of png_uint_32.
- */
-#ifdef PNG_SMALL_SIZE_T
-   typedef png_uint_32 png_alloc_size_t;
-#else
-   typedef png_size_t png_alloc_size_t;
-#endif
-
-/* Prior to 1.6.0 libpng offered limited support for Microsoft C compiler
- * implementations of Intel CPU specific support of user-mode segmented address
- * spaces, where 16-bit pointers address more than 65536 bytes of memory using
- * separate 'segment' registers.  The implementation requires two different
- * types of pointer (only one of which includes the segment value.)
- *
- * If required this support is available in version 1.2 of libpng and may be
- * available in versions through 1.5, although the correctness of the code has
- * not been verified recently.
- */
-
-/* Typedef for floating-point numbers that are converted to fixed-point with a
- * multiple of 100,000, e.g., gamma
- */
-typedef png_int_32 png_fixed_point;
-
-/* Add typedefs for pointers */
-typedef void                  * png_voidp;
-typedef const void            * png_const_voidp;
-typedef png_byte              * png_bytep;
-typedef const png_byte        * png_const_bytep;
-typedef png_uint_32           * png_uint_32p;
-typedef const png_uint_32     * png_const_uint_32p;
-typedef png_int_32            * png_int_32p;
-typedef const png_int_32      * png_const_int_32p;
-typedef png_uint_16           * png_uint_16p;
-typedef const png_uint_16     * png_const_uint_16p;
-typedef png_int_16            * png_int_16p;
-typedef const png_int_16      * png_const_int_16p;
-typedef char                  * png_charp;
-typedef const char            * png_const_charp;
-typedef png_fixed_point       * png_fixed_point_p;
-typedef const png_fixed_point * png_const_fixed_point_p;
-typedef png_size_t            * png_size_tp;
-typedef const png_size_t      * png_const_size_tp;
-
-#ifdef PNG_STDIO_SUPPORTED
-typedef FILE            * png_FILE_p;
-#endif
-
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-typedef double       * png_doublep;
-typedef const double * png_const_doublep;
-#endif
-
-/* Pointers to pointers; i.e. arrays */
-typedef png_byte        * * png_bytepp;
-typedef png_uint_32     * * png_uint_32pp;
-typedef png_int_32      * * png_int_32pp;
-typedef png_uint_16     * * png_uint_16pp;
-typedef png_int_16      * * png_int_16pp;
-typedef const char      * * png_const_charpp;
-typedef char            * * png_charpp;
-typedef png_fixed_point * * png_fixed_point_pp;
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-typedef double          * * png_doublepp;
-#endif
-
-/* Pointers to pointers to pointers; i.e., pointer to array */
-typedef char            * * * png_charppp;
-
-#endif /* PNG_BUILDING_SYMBOL_TABLE */
-
-#endif /* PNGCONF_H */
diff --git a/src/png/libpng/pngdebug.h b/src/png/libpng/pngdebug.h
deleted file mode 100644
index 15a7ed0c9..000000000
--- a/src/png/libpng/pngdebug.h
+++ /dev/null
@@ -1,153 +0,0 @@
-
-/* pngdebug.h - Debugging macros for libpng, also used in pngtest.c
- *
- * Last changed in libpng 1.6.8 [December 19, 2013]
- * Copyright (c) 1998-2002,2004,2006-2013 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-/* Define PNG_DEBUG at compile time for debugging information.  Higher
- * numbers for PNG_DEBUG mean more debugging information.  This has
- * only been added since version 0.95 so it is not implemented throughout
- * libpng yet, but more support will be added as needed.
- *
- * png_debug[1-2]?(level, message ,arg{0-2})
- *   Expands to a statement (either a simple expression or a compound
- *   do..while(0) statement) that outputs a message with parameter
- *   substitution if PNG_DEBUG is defined to 2 or more.  If PNG_DEBUG
- *   is undefined, 0 or 1 every png_debug expands to a simple expression
- *   (actually ((void)0)).
- *
- *   level: level of detail of message, starting at 0.  A level 'n'
- *          message is preceded by 'n' 3-space indentations (not implemented
- *          on Microsoft compilers unless PNG_DEBUG_FILE is also
- *          defined, to allow debug DLL compilation with no standard IO).
- *   message: a printf(3) style text string.  A trailing '\n' is added
- *            to the message.
- *   arg: 0 to 2 arguments for printf(3) style substitution in message.
- */
-#ifndef PNGDEBUG_H
-#define PNGDEBUG_H
-/* These settings control the formatting of messages in png.c and pngerror.c */
-/* Moved to pngdebug.h at 1.5.0 */
-#  ifndef PNG_LITERAL_SHARP
-#    define PNG_LITERAL_SHARP 0x23
-#  endif
-#  ifndef PNG_LITERAL_LEFT_SQUARE_BRACKET
-#    define PNG_LITERAL_LEFT_SQUARE_BRACKET 0x5b
-#  endif
-#  ifndef PNG_LITERAL_RIGHT_SQUARE_BRACKET
-#    define PNG_LITERAL_RIGHT_SQUARE_BRACKET 0x5d
-#  endif
-#  ifndef PNG_STRING_NEWLINE
-#    define PNG_STRING_NEWLINE "\n"
-#  endif
-
-#ifdef PNG_DEBUG
-#  if (PNG_DEBUG > 0)
-#    if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
-#      include <crtdbg.h>
-#      if (PNG_DEBUG > 1)
-#        ifndef _DEBUG
-#          define _DEBUG
-#        endif
-#        ifndef png_debug
-#          define png_debug(l,m)  _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
-#        endif
-#        ifndef png_debug1
-#          define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
-#        endif
-#        ifndef png_debug2
-#          define png_debug2(l,m,p1,p2) \
-             _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
-#        endif
-#      endif
-#    else /* PNG_DEBUG_FILE || !_MSC_VER */
-#      ifndef PNG_STDIO_SUPPORTED
-#        include <stdio.h> /* not included yet */
-#      endif
-#      ifndef PNG_DEBUG_FILE
-#        define PNG_DEBUG_FILE stderr
-#      endif /* PNG_DEBUG_FILE */
-
-#      if (PNG_DEBUG > 1)
-#        ifdef __STDC__
-#          ifndef png_debug
-#            define png_debug(l,m) \
-       do { \
-       int num_tabs=l; \
-       fprintf(PNG_DEBUG_FILE,"%s" m PNG_STRING_NEWLINE,(num_tabs==1 ? "   " : \
-         (num_tabs==2 ? "      " : (num_tabs>2 ? "         " : "")))); \
-       } while (0)
-#          endif
-#          ifndef png_debug1
-#            define png_debug1(l,m,p1) \
-       do { \
-       int num_tabs=l; \
-       fprintf(PNG_DEBUG_FILE,"%s" m PNG_STRING_NEWLINE,(num_tabs==1 ? "   " : \
-         (num_tabs==2 ? "      " : (num_tabs>2 ? "         " : ""))),p1); \
-       } while (0)
-#          endif
-#          ifndef png_debug2
-#            define png_debug2(l,m,p1,p2) \
-       do { \
-       int num_tabs=l; \
-       fprintf(PNG_DEBUG_FILE,"%s" m PNG_STRING_NEWLINE,(num_tabs==1 ? "   " : \
-         (num_tabs==2 ? "      " : (num_tabs>2 ? "         " : ""))),p1,p2);\
-       } while (0)
-#          endif
-#        else /* __STDC __ */
-#          ifndef png_debug
-#            define png_debug(l,m) \
-       do { \
-       int num_tabs=l; \
-       char format[256]; \
-       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
-         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
-         m,PNG_STRING_NEWLINE); \
-       fprintf(PNG_DEBUG_FILE,format); \
-       } while (0)
-#          endif
-#          ifndef png_debug1
-#            define png_debug1(l,m,p1) \
-       do { \
-       int num_tabs=l; \
-       char format[256]; \
-       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
-         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
-         m,PNG_STRING_NEWLINE); \
-       fprintf(PNG_DEBUG_FILE,format,p1); \
-       } while (0)
-#          endif
-#          ifndef png_debug2
-#            define png_debug2(l,m,p1,p2) \
-       do { \
-       int num_tabs=l; \
-       char format[256]; \
-       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
-         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
-         m,PNG_STRING_NEWLINE); \
-       fprintf(PNG_DEBUG_FILE,format,p1,p2); \
-       } while (0)
-#          endif
-#        endif /* __STDC __ */
-#      endif /* (PNG_DEBUG > 1) */
-
-#    endif /* _MSC_VER */
-#  endif /* (PNG_DEBUG > 0) */
-#endif /* PNG_DEBUG */
-#ifndef png_debug
-#  define png_debug(l, m) ((void)0)
-#endif
-#ifndef png_debug1
-#  define png_debug1(l, m, p1) ((void)0)
-#endif
-#ifndef png_debug2
-#  define png_debug2(l, m, p1, p2) ((void)0)
-#endif
-#endif /* PNGDEBUG_H */
diff --git a/src/png/libpng/pngerror.c b/src/png/libpng/pngerror.c
deleted file mode 100644
index ad48bfb98..000000000
--- a/src/png/libpng/pngerror.c
+++ /dev/null
@@ -1,963 +0,0 @@
-
-/* pngerror.c - stub functions for i/o and memory allocation
- *
- * Last changed in libpng 1.6.31 [July 27, 2017]
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * This file provides a location for all error handling.  Users who
- * need special error handling are expected to write replacement functions
- * and use png_set_error_fn() to use those functions.  See the instructions
- * at each function.
- */
-
-#include "pngpriv.h"
-
-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-
-static PNG_FUNCTION(void, png_default_error,PNGARG((png_const_structrp png_ptr,
-    png_const_charp error_message)),PNG_NORETURN);
-
-#ifdef PNG_WARNINGS_SUPPORTED
-static void /* PRIVATE */
-png_default_warning PNGARG((png_const_structrp png_ptr,
-    png_const_charp warning_message));
-#endif /* WARNINGS */
-
-/* This function is called whenever there is a fatal error.  This function
- * should not be changed.  If there is a need to handle errors differently,
- * you should supply a replacement error function and use png_set_error_fn()
- * to replace the error function at run-time.
- */
-#ifdef PNG_ERROR_TEXT_SUPPORTED
-PNG_FUNCTION(void,PNGAPI
-png_error,(png_const_structrp png_ptr, png_const_charp error_message),
-    PNG_NORETURN)
-{
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
-   char msg[16];
-   if (png_ptr != NULL)
-   {
-      if ((png_ptr->flags &
-         (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) != 0)
-      {
-         if (*error_message == PNG_LITERAL_SHARP)
-         {
-            /* Strip "#nnnn " from beginning of error message. */
-            int offset;
-            for (offset = 1; offset<15; offset++)
-               if (error_message[offset] == ' ')
-                  break;
-
-            if ((png_ptr->flags & PNG_FLAG_STRIP_ERROR_TEXT) != 0)
-            {
-               int i;
-               for (i = 0; i < offset - 1; i++)
-                  msg[i] = error_message[i + 1];
-               msg[i - 1] = '\0';
-               error_message = msg;
-            }
-
-            else
-               error_message += offset;
-         }
-
-         else
-         {
-            if ((png_ptr->flags & PNG_FLAG_STRIP_ERROR_TEXT) != 0)
-            {
-               msg[0] = '0';
-               msg[1] = '\0';
-               error_message = msg;
-            }
-         }
-      }
-   }
-#endif
-   if (png_ptr != NULL && png_ptr->error_fn != NULL)
-      (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr),
-          error_message);
-
-   /* If the custom handler doesn't exist, or if it returns,
-      use the default handler, which will not return. */
-   png_default_error(png_ptr, error_message);
-}
-#else
-PNG_FUNCTION(void,PNGAPI
-png_err,(png_const_structrp png_ptr),PNG_NORETURN)
-{
-   /* Prior to 1.5.2 the error_fn received a NULL pointer, expressed
-    * erroneously as '\0', instead of the empty string "".  This was
-    * apparently an error, introduced in libpng-1.2.20, and png_default_error
-    * will crash in this case.
-    */
-   if (png_ptr != NULL && png_ptr->error_fn != NULL)
-      (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr), "");
-
-   /* If the custom handler doesn't exist, or if it returns,
-      use the default handler, which will not return. */
-   png_default_error(png_ptr, "");
-}
-#endif /* ERROR_TEXT */
-
-/* Utility to safely appends strings to a buffer.  This never errors out so
- * error checking is not required in the caller.
- */
-size_t
-png_safecat(png_charp buffer, size_t bufsize, size_t pos,
-    png_const_charp string)
-{
-   if (buffer != NULL && pos < bufsize)
-   {
-      if (string != NULL)
-         while (*string != '\0' && pos < bufsize-1)
-           buffer[pos++] = *string++;
-
-      buffer[pos] = '\0';
-   }
-
-   return pos;
-}
-
-#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
-/* Utility to dump an unsigned value into a buffer, given a start pointer and
- * and end pointer (which should point just *beyond* the end of the buffer!)
- * Returns the pointer to the start of the formatted string.
- */
-png_charp
-png_format_number(png_const_charp start, png_charp end, int format,
-    png_alloc_size_t number)
-{
-   int count = 0;    /* number of digits output */
-   int mincount = 1; /* minimum number required */
-   int output = 0;   /* digit output (for the fixed point format) */
-
-   *--end = '\0';
-
-   /* This is written so that the loop always runs at least once, even with
-    * number zero.
-    */
-   while (end > start && (number != 0 || count < mincount))
-   {
-
-      static const char digits[] = "0123456789ABCDEF";
-
-      switch (format)
-      {
-         case PNG_NUMBER_FORMAT_fixed:
-            /* Needs five digits (the fraction) */
-            mincount = 5;
-            if (output != 0 || number % 10 != 0)
-            {
-               *--end = digits[number % 10];
-               output = 1;
-            }
-            number /= 10;
-            break;
-
-         case PNG_NUMBER_FORMAT_02u:
-            /* Expects at least 2 digits. */
-            mincount = 2;
-            /* FALLTHROUGH */
-
-         case PNG_NUMBER_FORMAT_u:
-            *--end = digits[number % 10];
-            number /= 10;
-            break;
-
-         case PNG_NUMBER_FORMAT_02x:
-            /* This format expects at least two digits */
-            mincount = 2;
-            /* FALLTHROUGH */
-
-         case PNG_NUMBER_FORMAT_x:
-            *--end = digits[number & 0xf];
-            number >>= 4;
-            break;
-
-         default: /* an error */
-            number = 0;
-            break;
-      }
-
-      /* Keep track of the number of digits added */
-      ++count;
-
-      /* Float a fixed number here: */
-      if ((format == PNG_NUMBER_FORMAT_fixed) && (count == 5) && (end > start))
-      {
-         /* End of the fraction, but maybe nothing was output?  In that case
-          * drop the decimal point.  If the number is a true zero handle that
-          * here.
-          */
-         if (output != 0)
-            *--end = '.';
-         else if (number == 0) /* and !output */
-            *--end = '0';
-      }
-   }
-
-   return end;
-}
-#endif
-
-#ifdef PNG_WARNINGS_SUPPORTED
-/* This function is called whenever there is a non-fatal error.  This function
- * should not be changed.  If there is a need to handle warnings differently,
- * you should supply a replacement warning function and use
- * png_set_error_fn() to replace the warning function at run-time.
- */
-void PNGAPI
-png_warning(png_const_structrp png_ptr, png_const_charp warning_message)
-{
-   int offset = 0;
-   if (png_ptr != NULL)
-   {
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
-   if ((png_ptr->flags &
-       (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) != 0)
-#endif
-      {
-         if (*warning_message == PNG_LITERAL_SHARP)
-         {
-            for (offset = 1; offset < 15; offset++)
-               if (warning_message[offset] == ' ')
-                  break;
-         }
-      }
-   }
-   if (png_ptr != NULL && png_ptr->warning_fn != NULL)
-      (*(png_ptr->warning_fn))(png_constcast(png_structrp,png_ptr),
-          warning_message + offset);
-   else
-      png_default_warning(png_ptr, warning_message + offset);
-}
-
-/* These functions support 'formatted' warning messages with up to
- * PNG_WARNING_PARAMETER_COUNT parameters.  In the format string the parameter
- * is introduced by @<number>, where 'number' starts at 1.  This follows the
- * standard established by X/Open for internationalizable error messages.
- */
-void
-png_warning_parameter(png_warning_parameters p, int number,
-    png_const_charp string)
-{
-   if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT)
-      (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string);
-}
-
-void
-png_warning_parameter_unsigned(png_warning_parameters p, int number, int format,
-    png_alloc_size_t value)
-{
-   char buffer[PNG_NUMBER_BUFFER_SIZE];
-   png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value));
-}
-
-void
-png_warning_parameter_signed(png_warning_parameters p, int number, int format,
-    png_int_32 value)
-{
-   png_alloc_size_t u;
-   png_charp str;
-   char buffer[PNG_NUMBER_BUFFER_SIZE];
-
-   /* Avoid overflow by doing the negate in a png_alloc_size_t: */
-   u = (png_alloc_size_t)value;
-   if (value < 0)
-      u = ~u + 1;
-
-   str = PNG_FORMAT_NUMBER(buffer, format, u);
-
-   if (value < 0 && str > buffer)
-      *--str = '-';
-
-   png_warning_parameter(p, number, str);
-}
-
-void
-png_formatted_warning(png_const_structrp png_ptr, png_warning_parameters p,
-    png_const_charp message)
-{
-   /* The internal buffer is just 192 bytes - enough for all our messages,
-    * overflow doesn't happen because this code checks!  If someone figures
-    * out how to send us a message longer than 192 bytes, all that will
-    * happen is that the message will be truncated appropriately.
-    */
-   size_t i = 0; /* Index in the msg[] buffer: */
-   char msg[192];
-
-   /* Each iteration through the following loop writes at most one character
-    * to msg[i++] then returns here to validate that there is still space for
-    * the trailing '\0'.  It may (in the case of a parameter) read more than
-    * one character from message[]; it must check for '\0' and continue to the
-    * test if it finds the end of string.
-    */
-   while (i<(sizeof msg)-1 && *message != '\0')
-   {
-      /* '@' at end of string is now just printed (previously it was skipped);
-       * it is an error in the calling code to terminate the string with @.
-       */
-      if (p != NULL && *message == '@' && message[1] != '\0')
-      {
-         int parameter_char = *++message; /* Consume the '@' */
-         static const char valid_parameters[] = "123456789";
-         int parameter = 0;
-
-         /* Search for the parameter digit, the index in the string is the
-          * parameter to use.
-          */
-         while (valid_parameters[parameter] != parameter_char &&
-            valid_parameters[parameter] != '\0')
-            ++parameter;
-
-         /* If the parameter digit is out of range it will just get printed. */
-         if (parameter < PNG_WARNING_PARAMETER_COUNT)
-         {
-            /* Append this parameter */
-            png_const_charp parm = p[parameter];
-            png_const_charp pend = p[parameter] + (sizeof p[parameter]);
-
-            /* No need to copy the trailing '\0' here, but there is no guarantee
-             * that parm[] has been initialized, so there is no guarantee of a
-             * trailing '\0':
-             */
-            while (i<(sizeof msg)-1 && *parm != '\0' && parm < pend)
-               msg[i++] = *parm++;
-
-            /* Consume the parameter digit too: */
-            ++message;
-            continue;
-         }
-
-         /* else not a parameter and there is a character after the @ sign; just
-          * copy that.  This is known not to be '\0' because of the test above.
-          */
-      }
-
-      /* At this point *message can't be '\0', even in the bad parameter case
-       * above where there is a lone '@' at the end of the message string.
-       */
-      msg[i++] = *message++;
-   }
-
-   /* i is always less than (sizeof msg), so: */
-   msg[i] = '\0';
-
-   /* And this is the formatted message. It may be larger than
-    * PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these
-    * are not (currently) formatted.
-    */
-   png_warning(png_ptr, msg);
-}
-#endif /* WARNINGS */
-
-#ifdef PNG_BENIGN_ERRORS_SUPPORTED
-void PNGAPI
-png_benign_error(png_const_structrp png_ptr, png_const_charp error_message)
-{
-   if ((png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) != 0)
-   {
-#     ifdef PNG_READ_SUPPORTED
-         if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
-            png_ptr->chunk_name != 0)
-            png_chunk_warning(png_ptr, error_message);
-         else
-#     endif
-      png_warning(png_ptr, error_message);
-   }
-
-   else
-   {
-#     ifdef PNG_READ_SUPPORTED
-         if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
-            png_ptr->chunk_name != 0)
-            png_chunk_error(png_ptr, error_message);
-         else
-#     endif
-      png_error(png_ptr, error_message);
-   }
-
-#  ifndef PNG_ERROR_TEXT_SUPPORTED
-      PNG_UNUSED(error_message)
-#  endif
-}
-
-void /* PRIVATE */
-png_app_warning(png_const_structrp png_ptr, png_const_charp error_message)
-{
-   if ((png_ptr->flags & PNG_FLAG_APP_WARNINGS_WARN) != 0)
-      png_warning(png_ptr, error_message);
-   else
-      png_error(png_ptr, error_message);
-
-#  ifndef PNG_ERROR_TEXT_SUPPORTED
-      PNG_UNUSED(error_message)
-#  endif
-}
-
-void /* PRIVATE */
-png_app_error(png_const_structrp png_ptr, png_const_charp error_message)
-{
-   if ((png_ptr->flags & PNG_FLAG_APP_ERRORS_WARN) != 0)
-      png_warning(png_ptr, error_message);
-   else
-      png_error(png_ptr, error_message);
-
-#  ifndef PNG_ERROR_TEXT_SUPPORTED
-      PNG_UNUSED(error_message)
-#  endif
-}
-#endif /* BENIGN_ERRORS */
-
-#define PNG_MAX_ERROR_TEXT 196 /* Currently limited by profile_error in png.c */
-#if defined(PNG_WARNINGS_SUPPORTED) || \
-   (defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED))
-/* These utilities are used internally to build an error message that relates
- * to the current chunk.  The chunk name comes from png_ptr->chunk_name,
- * which is used to prefix the message.  The message is limited in length
- * to 63 bytes. The name characters are output as hex digits wrapped in []
- * if the character is invalid.
- */
-#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
-static PNG_CONST char png_digit[16] = {
-   '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
-   'A', 'B', 'C', 'D', 'E', 'F'
-};
-
-static void /* PRIVATE */
-png_format_buffer(png_const_structrp png_ptr, png_charp buffer, png_const_charp
-    error_message)
-{
-   png_uint_32 chunk_name = png_ptr->chunk_name;
-   int iout = 0, ishift = 24;
-
-   while (ishift >= 0)
-   {
-      int c = (int)(chunk_name >> ishift) & 0xff;
-
-      ishift -= 8;
-      if (isnonalpha(c) != 0)
-      {
-         buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET;
-         buffer[iout++] = png_digit[(c & 0xf0) >> 4];
-         buffer[iout++] = png_digit[c & 0x0f];
-         buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET;
-      }
-
-      else
-      {
-         buffer[iout++] = (char)c;
-      }
-   }
-
-   if (error_message == NULL)
-      buffer[iout] = '\0';
-
-   else
-   {
-      int iin = 0;
-
-      buffer[iout++] = ':';
-      buffer[iout++] = ' ';
-
-      while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0')
-         buffer[iout++] = error_message[iin++];
-
-      /* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */
-      buffer[iout] = '\0';
-   }
-}
-#endif /* WARNINGS || ERROR_TEXT */
-
-#if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
-PNG_FUNCTION(void,PNGAPI
-png_chunk_error,(png_const_structrp png_ptr, png_const_charp error_message),
-    PNG_NORETURN)
-{
-   char msg[18+PNG_MAX_ERROR_TEXT];
-   if (png_ptr == NULL)
-      png_error(png_ptr, error_message);
-
-   else
-   {
-      png_format_buffer(png_ptr, msg, error_message);
-      png_error(png_ptr, msg);
-   }
-}
-#endif /* READ && ERROR_TEXT */
-
-#ifdef PNG_WARNINGS_SUPPORTED
-void PNGAPI
-png_chunk_warning(png_const_structrp png_ptr, png_const_charp warning_message)
-{
-   char msg[18+PNG_MAX_ERROR_TEXT];
-   if (png_ptr == NULL)
-      png_warning(png_ptr, warning_message);
-
-   else
-   {
-      png_format_buffer(png_ptr, msg, warning_message);
-      png_warning(png_ptr, msg);
-   }
-}
-#endif /* WARNINGS */
-
-#ifdef PNG_READ_SUPPORTED
-#ifdef PNG_BENIGN_ERRORS_SUPPORTED
-void PNGAPI
-png_chunk_benign_error(png_const_structrp png_ptr, png_const_charp
-    error_message)
-{
-   if ((png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) != 0)
-      png_chunk_warning(png_ptr, error_message);
-
-   else
-      png_chunk_error(png_ptr, error_message);
-
-#  ifndef PNG_ERROR_TEXT_SUPPORTED
-      PNG_UNUSED(error_message)
-#  endif
-}
-#endif
-#endif /* READ */
-
-void /* PRIVATE */
-png_chunk_report(png_const_structrp png_ptr, png_const_charp message, int error)
-{
-#  ifndef PNG_WARNINGS_SUPPORTED
-      PNG_UNUSED(message)
-#  endif
-
-   /* This is always supported, but for just read or just write it
-    * unconditionally does the right thing.
-    */
-#  if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED)
-      if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
-#  endif
-
-#  ifdef PNG_READ_SUPPORTED
-      {
-         if (error < PNG_CHUNK_ERROR)
-            png_chunk_warning(png_ptr, message);
-
-         else
-            png_chunk_benign_error(png_ptr, message);
-      }
-#  endif
-
-#  if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED)
-      else if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
-#  endif
-
-#  ifdef PNG_WRITE_SUPPORTED
-      {
-         if (error < PNG_CHUNK_WRITE_ERROR)
-            png_app_warning(png_ptr, message);
-
-         else
-            png_app_error(png_ptr, message);
-      }
-#  endif
-}
-
-#ifdef PNG_ERROR_TEXT_SUPPORTED
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-PNG_FUNCTION(void,
-png_fixed_error,(png_const_structrp png_ptr, png_const_charp name),PNG_NORETURN)
-{
-#  define fixed_message "fixed point overflow in "
-#  define fixed_message_ln ((sizeof fixed_message)-1)
-   unsigned int  iin;
-   char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT];
-   memcpy(msg, fixed_message, fixed_message_ln);
-   iin = 0;
-   if (name != NULL)
-      while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0)
-      {
-         msg[fixed_message_ln + iin] = name[iin];
-         ++iin;
-      }
-   msg[fixed_message_ln + iin] = 0;
-   png_error(png_ptr, msg);
-}
-#endif
-#endif
-
-#ifdef PNG_SETJMP_SUPPORTED
-/* This API only exists if ANSI-C style error handling is used,
- * otherwise it is necessary for png_default_error to be overridden.
- */
-jmp_buf* PNGAPI
-png_set_longjmp_fn(png_structrp png_ptr, png_longjmp_ptr longjmp_fn,
-    size_t jmp_buf_size)
-{
-   /* From libpng 1.6.0 the app gets one chance to set a 'jmpbuf_size' value
-    * and it must not change after that.  Libpng doesn't care how big the
-    * buffer is, just that it doesn't change.
-    *
-    * If the buffer size is no *larger* than the size of jmp_buf when libpng is
-    * compiled a built in jmp_buf is returned; this preserves the pre-1.6.0
-    * semantics that this call will not fail.  If the size is larger, however,
-    * the buffer is allocated and this may fail, causing the function to return
-    * NULL.
-    */
-   if (png_ptr == NULL)
-      return NULL;
-
-   if (png_ptr->jmp_buf_ptr == NULL)
-   {
-      png_ptr->jmp_buf_size = 0; /* not allocated */
-
-      if (jmp_buf_size <= (sizeof png_ptr->jmp_buf_local))
-         png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local;
-
-      else
-      {
-         png_ptr->jmp_buf_ptr = png_voidcast(jmp_buf *,
-             png_malloc_warn(png_ptr, jmp_buf_size));
-
-         if (png_ptr->jmp_buf_ptr == NULL)
-            return NULL; /* new NULL return on OOM */
-
-         png_ptr->jmp_buf_size = jmp_buf_size;
-      }
-   }
-
-   else /* Already allocated: check the size */
-   {
-      size_t size = png_ptr->jmp_buf_size;
-
-      if (size == 0)
-      {
-         size = (sizeof png_ptr->jmp_buf_local);
-         if (png_ptr->jmp_buf_ptr != &png_ptr->jmp_buf_local)
-         {
-            /* This is an internal error in libpng: somehow we have been left
-             * with a stack allocated jmp_buf when the application regained
-             * control.  It's always possible to fix this up, but for the moment
-             * this is a png_error because that makes it easy to detect.
-             */
-            png_error(png_ptr, "Libpng jmp_buf still allocated");
-            /* png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; */
-         }
-      }
-
-      if (size != jmp_buf_size)
-      {
-         png_warning(png_ptr, "Application jmp_buf size changed");
-         return NULL; /* caller will probably crash: no choice here */
-      }
-   }
-
-   /* Finally fill in the function, now we have a satisfactory buffer. It is
-    * valid to change the function on every call.
-    */
-   png_ptr->longjmp_fn = longjmp_fn;
-   return png_ptr->jmp_buf_ptr;
-}
-
-void /* PRIVATE */
-png_free_jmpbuf(png_structrp png_ptr)
-{
-   if (png_ptr != NULL)
-   {
-      jmp_buf *jb = png_ptr->jmp_buf_ptr;
-
-      /* A size of 0 is used to indicate a local, stack, allocation of the
-       * pointer; used here and in png.c
-       */
-      if (jb != NULL && png_ptr->jmp_buf_size > 0)
-      {
-
-         /* This stuff is so that a failure to free the error control structure
-          * does not leave libpng in a state with no valid error handling: the
-          * free always succeeds, if there is an error it gets ignored.
-          */
-         if (jb != &png_ptr->jmp_buf_local)
-         {
-            /* Make an internal, libpng, jmp_buf to return here */
-            jmp_buf free_jmp_buf;
-
-            if (!setjmp(free_jmp_buf))
-            {
-               png_ptr->jmp_buf_ptr = &free_jmp_buf; /* come back here */
-               png_ptr->jmp_buf_size = 0; /* stack allocation */
-               png_ptr->longjmp_fn = longjmp;
-               png_free(png_ptr, jb); /* Return to setjmp on error */
-            }
-         }
-      }
-
-      /* *Always* cancel everything out: */
-      png_ptr->jmp_buf_size = 0;
-      png_ptr->jmp_buf_ptr = NULL;
-      png_ptr->longjmp_fn = 0;
-   }
-}
-#endif
-
-/* This is the default error handling function.  Note that replacements for
- * this function MUST NOT RETURN, or the program will likely crash.  This
- * function is used by default, or if the program supplies NULL for the
- * error function pointer in png_set_error_fn().
- */
-static PNG_FUNCTION(void /* PRIVATE */,
-png_default_error,(png_const_structrp png_ptr, png_const_charp error_message),
-    PNG_NORETURN)
-{
-#ifdef PNG_CONSOLE_IO_SUPPORTED
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
-   /* Check on NULL only added in 1.5.4 */
-   if (error_message != NULL && *error_message == PNG_LITERAL_SHARP)
-   {
-      /* Strip "#nnnn " from beginning of error message. */
-      int offset;
-      char error_number[16];
-      for (offset = 0; offset<15; offset++)
-      {
-         error_number[offset] = error_message[offset + 1];
-         if (error_message[offset] == ' ')
-            break;
-      }
-
-      if ((offset > 1) && (offset < 15))
-      {
-         error_number[offset - 1] = '\0';
-         fprintf(stderr, "libpng error no. %s: %s",
-             error_number, error_message + offset + 1);
-         fprintf(stderr, PNG_STRING_NEWLINE);
-      }
-
-      else
-      {
-         fprintf(stderr, "libpng error: %s, offset=%d",
-             error_message, offset);
-         fprintf(stderr, PNG_STRING_NEWLINE);
-      }
-   }
-   else
-#endif
-   {
-      fprintf(stderr, "libpng error: %s", error_message ? error_message :
-         "undefined");
-      fprintf(stderr, PNG_STRING_NEWLINE);
-   }
-#else
-   PNG_UNUSED(error_message) /* Make compiler happy */
-#endif
-   png_longjmp(png_ptr, 1);
-}
-
-PNG_FUNCTION(void,PNGAPI
-png_longjmp,(png_const_structrp png_ptr, int val),PNG_NORETURN)
-{
-#ifdef PNG_SETJMP_SUPPORTED
-   if (png_ptr != NULL && png_ptr->longjmp_fn != NULL &&
-       png_ptr->jmp_buf_ptr != NULL)
-      png_ptr->longjmp_fn(*png_ptr->jmp_buf_ptr, val);
-#else
-   PNG_UNUSED(png_ptr)
-   PNG_UNUSED(val)
-#endif
-
-   /* If control reaches this point, png_longjmp() must not return. The only
-    * choice is to terminate the whole process (or maybe the thread); to do
-    * this the ANSI-C abort() function is used unless a different method is
-    * implemented by overriding the default configuration setting for
-    * PNG_ABORT().
-    */
-   PNG_ABORT();
-}
-
-#ifdef PNG_WARNINGS_SUPPORTED
-/* This function is called when there is a warning, but the library thinks
- * it can continue anyway.  Replacement functions don't have to do anything
- * here if you don't want them to.  In the default configuration, png_ptr is
- * not used, but it is passed in case it may be useful.
- */
-static void /* PRIVATE */
-png_default_warning(png_const_structrp png_ptr, png_const_charp warning_message)
-{
-#ifdef PNG_CONSOLE_IO_SUPPORTED
-#  ifdef PNG_ERROR_NUMBERS_SUPPORTED
-   if (*warning_message == PNG_LITERAL_SHARP)
-   {
-      int offset;
-      char warning_number[16];
-      for (offset = 0; offset < 15; offset++)
-      {
-         warning_number[offset] = warning_message[offset + 1];
-         if (warning_message[offset] == ' ')
-            break;
-      }
-
-      if ((offset > 1) && (offset < 15))
-      {
-         warning_number[offset + 1] = '\0';
-         fprintf(stderr, "libpng warning no. %s: %s",
-             warning_number, warning_message + offset);
-         fprintf(stderr, PNG_STRING_NEWLINE);
-      }
-
-      else
-      {
-         fprintf(stderr, "libpng warning: %s",
-             warning_message);
-         fprintf(stderr, PNG_STRING_NEWLINE);
-      }
-   }
-   else
-#  endif
-
-   {
-      fprintf(stderr, "libpng warning: %s", warning_message);
-      fprintf(stderr, PNG_STRING_NEWLINE);
-   }
-#else
-   PNG_UNUSED(warning_message) /* Make compiler happy */
-#endif
-   PNG_UNUSED(png_ptr) /* Make compiler happy */
-}
-#endif /* WARNINGS */
-
-/* This function is called when the application wants to use another method
- * of handling errors and warnings.  Note that the error function MUST NOT
- * return to the calling routine or serious problems will occur.  The return
- * method used in the default routine calls longjmp(png_ptr->jmp_buf_ptr, 1)
- */
-void PNGAPI
-png_set_error_fn(png_structrp png_ptr, png_voidp error_ptr,
-    png_error_ptr error_fn, png_error_ptr warning_fn)
-{
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->error_ptr = error_ptr;
-   png_ptr->error_fn = error_fn;
-#ifdef PNG_WARNINGS_SUPPORTED
-   png_ptr->warning_fn = warning_fn;
-#else
-   PNG_UNUSED(warning_fn)
-#endif
-}
-
-
-/* This function returns a pointer to the error_ptr associated with the user
- * functions.  The application should free any memory associated with this
- * pointer before png_write_destroy and png_read_destroy are called.
- */
-png_voidp PNGAPI
-png_get_error_ptr(png_const_structrp png_ptr)
-{
-   if (png_ptr == NULL)
-      return NULL;
-
-   return ((png_voidp)png_ptr->error_ptr);
-}
-
-
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
-void PNGAPI
-png_set_strip_error_numbers(png_structrp png_ptr, png_uint_32 strip_mode)
-{
-   if (png_ptr != NULL)
-   {
-      png_ptr->flags &=
-         ((~(PNG_FLAG_STRIP_ERROR_NUMBERS |
-         PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
-   }
-}
-#endif
-
-#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
-   defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
-   /* Currently the above both depend on SETJMP_SUPPORTED, however it would be
-    * possible to implement without setjmp support just so long as there is some
-    * way to handle the error return here:
-    */
-PNG_FUNCTION(void /* PRIVATE */, (PNGCBAPI
-png_safe_error),(png_structp png_nonconst_ptr, png_const_charp error_message),
-    PNG_NORETURN)
-{
-   const png_const_structrp png_ptr = png_nonconst_ptr;
-   png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr);
-
-   /* An error is always logged here, overwriting anything (typically a warning)
-    * that is already there:
-    */
-   if (image != NULL)
-   {
-      png_safecat(image->message, (sizeof image->message), 0, error_message);
-      image->warning_or_error |= PNG_IMAGE_ERROR;
-
-      /* Retrieve the jmp_buf from within the png_control, making this work for
-       * C++ compilation too is pretty tricky: C++ wants a pointer to the first
-       * element of a jmp_buf, but C doesn't tell us the type of that.
-       */
-      if (image->opaque != NULL && image->opaque->error_buf != NULL)
-         longjmp(png_control_jmp_buf(image->opaque), 1);
-
-      /* Missing longjmp buffer, the following is to help debugging: */
-      {
-         size_t pos = png_safecat(image->message, (sizeof image->message), 0,
-             "bad longjmp: ");
-         png_safecat(image->message, (sizeof image->message), pos,
-             error_message);
-      }
-   }
-
-   /* Here on an internal programming error. */
-   abort();
-}
-
-#ifdef PNG_WARNINGS_SUPPORTED
-void /* PRIVATE */ PNGCBAPI
-png_safe_warning(png_structp png_nonconst_ptr, png_const_charp warning_message)
-{
-   const png_const_structrp png_ptr = png_nonconst_ptr;
-   png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr);
-
-   /* A warning is only logged if there is no prior warning or error. */
-   if (image->warning_or_error == 0)
-   {
-      png_safecat(image->message, (sizeof image->message), 0, warning_message);
-      image->warning_or_error |= PNG_IMAGE_WARNING;
-   }
-}
-#endif
-
-int /* PRIVATE */
-png_safe_execute(png_imagep image_in, int (*function)(png_voidp), png_voidp arg)
-{
-   volatile png_imagep image = image_in;
-   volatile int result;
-   volatile png_voidp saved_error_buf;
-   jmp_buf safe_jmpbuf;
-
-   /* Safely execute function(arg) with png_error returning to this function. */
-   saved_error_buf = image->opaque->error_buf;
-   result = setjmp(safe_jmpbuf) == 0;
-
-   if (result != 0)
-   {
-
-      image->opaque->error_buf = safe_jmpbuf;
-      result = function(arg);
-   }
-
-   image->opaque->error_buf = saved_error_buf;
-
-   /* And do the cleanup prior to any failure return. */
-   if (result == 0)
-      png_image_free(image);
-
-   return result;
-}
-#endif /* SIMPLIFIED READ || SIMPLIFIED_WRITE */
-#endif /* READ || WRITE */
diff --git a/src/png/libpng/pngget.c b/src/png/libpng/pngget.c
deleted file mode 100644
index 26e9fb1c3..000000000
--- a/src/png/libpng/pngget.c
+++ /dev/null
@@ -1,1248 +0,0 @@
-
-/* pngget.c - retrieval of values from info struct
- *
- * Last changed in libpng 1.6.32 [August 24, 2017]
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- */
-
-#include "pngpriv.h"
-
-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-
-png_uint_32 PNGAPI
-png_get_valid(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    png_uint_32 flag)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      return(info_ptr->valid & flag);
-
-   return(0);
-}
-
-png_size_t PNGAPI
-png_get_rowbytes(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      return(info_ptr->rowbytes);
-
-   return(0);
-}
-
-#ifdef PNG_INFO_IMAGE_SUPPORTED
-png_bytepp PNGAPI
-png_get_rows(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      return(info_ptr->row_pointers);
-
-   return(0);
-}
-#endif
-
-#ifdef PNG_EASY_ACCESS_SUPPORTED
-/* Easy access to info, added in libpng-0.99 */
-png_uint_32 PNGAPI
-png_get_image_width(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      return info_ptr->width;
-
-   return (0);
-}
-
-png_uint_32 PNGAPI
-png_get_image_height(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      return info_ptr->height;
-
-   return (0);
-}
-
-png_byte PNGAPI
-png_get_bit_depth(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      return info_ptr->bit_depth;
-
-   return (0);
-}
-
-png_byte PNGAPI
-png_get_color_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      return info_ptr->color_type;
-
-   return (0);
-}
-
-png_byte PNGAPI
-png_get_filter_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      return info_ptr->filter_type;
-
-   return (0);
-}
-
-png_byte PNGAPI
-png_get_interlace_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      return info_ptr->interlace_type;
-
-   return (0);
-}
-
-png_byte PNGAPI
-png_get_compression_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      return info_ptr->compression_type;
-
-   return (0);
-}
-
-png_uint_32 PNGAPI
-png_get_x_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
-   info_ptr)
-{
-#ifdef PNG_pHYs_SUPPORTED
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_pHYs) != 0)
-      {
-         png_debug1(1, "in %s retrieval function",
-             "png_get_x_pixels_per_meter");
-
-         if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
-            return (info_ptr->x_pixels_per_unit);
-      }
-#else
-   PNG_UNUSED(png_ptr)
-   PNG_UNUSED(info_ptr)
-#endif
-
-   return (0);
-}
-
-png_uint_32 PNGAPI
-png_get_y_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
-    info_ptr)
-{
-#ifdef PNG_pHYs_SUPPORTED
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_pHYs) != 0)
-   {
-      png_debug1(1, "in %s retrieval function",
-          "png_get_y_pixels_per_meter");
-
-      if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
-         return (info_ptr->y_pixels_per_unit);
-   }
-#else
-   PNG_UNUSED(png_ptr)
-   PNG_UNUSED(info_ptr)
-#endif
-
-   return (0);
-}
-
-png_uint_32 PNGAPI
-png_get_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-#ifdef PNG_pHYs_SUPPORTED
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_pHYs) != 0)
-   {
-      png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter");
-
-      if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER &&
-          info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit)
-         return (info_ptr->x_pixels_per_unit);
-   }
-#else
-   PNG_UNUSED(png_ptr)
-   PNG_UNUSED(info_ptr)
-#endif
-
-   return (0);
-}
-
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-float PNGAPI
-png_get_pixel_aspect_ratio(png_const_structrp png_ptr, png_const_inforp
-   info_ptr)
-{
-#ifdef PNG_READ_pHYs_SUPPORTED
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_pHYs) != 0)
-   {
-      png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio");
-
-      if (info_ptr->x_pixels_per_unit != 0)
-         return ((float)((float)info_ptr->y_pixels_per_unit
-             /(float)info_ptr->x_pixels_per_unit));
-   }
-#else
-   PNG_UNUSED(png_ptr)
-   PNG_UNUSED(info_ptr)
-#endif
-
-   return ((float)0.0);
-}
-#endif
-
-#ifdef PNG_FIXED_POINT_SUPPORTED
-png_fixed_point PNGAPI
-png_get_pixel_aspect_ratio_fixed(png_const_structrp png_ptr,
-    png_const_inforp info_ptr)
-{
-#ifdef PNG_READ_pHYs_SUPPORTED
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_pHYs) != 0 &&
-       info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0 &&
-       info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX &&
-       info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX)
-   {
-      png_fixed_point res;
-
-      png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio_fixed");
-
-      /* The following casts work because a PNG 4 byte integer only has a valid
-       * range of 0..2^31-1; otherwise the cast might overflow.
-       */
-      if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1,
-          (png_int_32)info_ptr->x_pixels_per_unit) != 0)
-         return res;
-   }
-#else
-   PNG_UNUSED(png_ptr)
-   PNG_UNUSED(info_ptr)
-#endif
-
-   return 0;
-}
-#endif
-
-png_int_32 PNGAPI
-png_get_x_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-#ifdef PNG_oFFs_SUPPORTED
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_oFFs) != 0)
-   {
-      png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
-
-      if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
-         return (info_ptr->x_offset);
-   }
-#else
-   PNG_UNUSED(png_ptr)
-   PNG_UNUSED(info_ptr)
-#endif
-
-   return (0);
-}
-
-png_int_32 PNGAPI
-png_get_y_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-#ifdef PNG_oFFs_SUPPORTED
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_oFFs) != 0)
-   {
-      png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
-
-      if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
-         return (info_ptr->y_offset);
-   }
-#else
-   PNG_UNUSED(png_ptr)
-   PNG_UNUSED(info_ptr)
-#endif
-
-   return (0);
-}
-
-png_int_32 PNGAPI
-png_get_x_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-#ifdef PNG_oFFs_SUPPORTED
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_oFFs) != 0)
-   {
-      png_debug1(1, "in %s retrieval function", "png_get_x_offset_pixels");
-
-      if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
-         return (info_ptr->x_offset);
-   }
-#else
-   PNG_UNUSED(png_ptr)
-   PNG_UNUSED(info_ptr)
-#endif
-
-   return (0);
-}
-
-png_int_32 PNGAPI
-png_get_y_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-#ifdef PNG_oFFs_SUPPORTED
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_oFFs) != 0)
-   {
-      png_debug1(1, "in %s retrieval function", "png_get_y_offset_pixels");
-
-      if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
-         return (info_ptr->y_offset);
-   }
-#else
-   PNG_UNUSED(png_ptr)
-   PNG_UNUSED(info_ptr)
-#endif
-
-   return (0);
-}
-
-#ifdef PNG_INCH_CONVERSIONS_SUPPORTED
-static png_uint_32
-ppi_from_ppm(png_uint_32 ppm)
-{
-#if 0
-   /* The conversion is *(2.54/100), in binary (32 digits):
-    * .00000110100000001001110101001001
-    */
-   png_uint_32 t1001, t1101;
-   ppm >>= 1;                  /* .1 */
-   t1001 = ppm + (ppm >> 3);   /* .1001 */
-   t1101 = t1001 + (ppm >> 1); /* .1101 */
-   ppm >>= 20;                 /* .000000000000000000001 */
-   t1101 += t1101 >> 15;       /* .1101000000000001101 */
-   t1001 >>= 11;               /* .000000000001001 */
-   t1001 += t1001 >> 12;       /* .000000000001001000000001001 */
-   ppm += t1001;               /* .000000000001001000001001001 */
-   ppm += t1101;               /* .110100000001001110101001001 */
-   return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */
-#else
-   /* The argument is a PNG unsigned integer, so it is not permitted
-    * to be bigger than 2^31.
-    */
-   png_fixed_point result;
-   if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127,
-       5000) != 0)
-      return (png_uint_32)result;
-
-   /* Overflow. */
-   return 0;
-#endif
-}
-
-png_uint_32 PNGAPI
-png_get_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));
-}
-
-png_uint_32 PNGAPI
-png_get_x_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr));
-}
-
-png_uint_32 PNGAPI
-png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));
-}
-
-#ifdef PNG_FIXED_POINT_SUPPORTED
-static png_fixed_point
-png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns)
-{
-   /* Convert from metres * 1,000,000 to inches * 100,000, meters to
-    * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.
-    * Notice that this can overflow - a warning is output and 0 is
-    * returned.
-    */
-   return png_muldiv_warn(png_ptr, microns, 500, 127);
-}
-
-png_fixed_point PNGAPI
-png_get_x_offset_inches_fixed(png_const_structrp png_ptr,
-    png_const_inforp info_ptr)
-{
-   return png_fixed_inches_from_microns(png_ptr,
-       png_get_x_offset_microns(png_ptr, info_ptr));
-}
-#endif
-
-#ifdef PNG_FIXED_POINT_SUPPORTED
-png_fixed_point PNGAPI
-png_get_y_offset_inches_fixed(png_const_structrp png_ptr,
-    png_const_inforp info_ptr)
-{
-   return png_fixed_inches_from_microns(png_ptr,
-       png_get_y_offset_microns(png_ptr, info_ptr));
-}
-#endif
-
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-float PNGAPI
-png_get_x_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   /* To avoid the overflow do the conversion directly in floating
-    * point.
-    */
-   return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937);
-}
-#endif
-
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-float PNGAPI
-png_get_y_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   /* To avoid the overflow do the conversion directly in floating
-    * point.
-    */
-   return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937);
-}
-#endif
-
-#ifdef PNG_pHYs_SUPPORTED
-png_uint_32 PNGAPI
-png_get_pHYs_dpi(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
-{
-   png_uint_32 retval = 0;
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_pHYs) != 0)
-   {
-      png_debug1(1, "in %s retrieval function", "pHYs");
-
-      if (res_x != NULL)
-      {
-         *res_x = info_ptr->x_pixels_per_unit;
-         retval |= PNG_INFO_pHYs;
-      }
-
-      if (res_y != NULL)
-      {
-         *res_y = info_ptr->y_pixels_per_unit;
-         retval |= PNG_INFO_pHYs;
-      }
-
-      if (unit_type != NULL)
-      {
-         *unit_type = (int)info_ptr->phys_unit_type;
-         retval |= PNG_INFO_pHYs;
-
-         if (*unit_type == 1)
-         {
-            if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
-            if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
-         }
-      }
-   }
-
-   return (retval);
-}
-#endif /* pHYs */
-#endif /* INCH_CONVERSIONS */
-
-/* png_get_channels really belongs in here, too, but it's been around longer */
-
-#endif /* EASY_ACCESS */
-
-
-png_byte PNGAPI
-png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      return(info_ptr->channels);
-
-   return (0);
-}
-
-#ifdef PNG_READ_SUPPORTED
-png_const_bytep PNGAPI
-png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      return(info_ptr->signature);
-
-   return (NULL);
-}
-#endif
-
-#ifdef PNG_bKGD_SUPPORTED
-png_uint_32 PNGAPI
-png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_color_16p *background)
-{
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_bKGD) != 0 &&
-       background != NULL)
-   {
-      png_debug1(1, "in %s retrieval function", "bKGD");
-
-      *background = &(info_ptr->background);
-      return (PNG_INFO_bKGD);
-   }
-
-   return (0);
-}
-#endif
-
-#ifdef PNG_cHRM_SUPPORTED
-/* The XYZ APIs were added in 1.5.5 to take advantage of the code added at the
- * same time to correct the rgb grayscale coefficient defaults obtained from the
- * cHRM chunk in 1.5.4
- */
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-png_uint_32 PNGAPI
-png_get_cHRM(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    double *white_x, double *white_y, double *red_x, double *red_y,
-    double *green_x, double *green_y, double *blue_x, double *blue_y)
-{
-   /* Quiet API change: this code used to only return the end points if a cHRM
-    * chunk was present, but the end points can also come from iCCP or sRGB
-    * chunks, so in 1.6.0 the png_get_ APIs return the end points regardless and
-    * the png_set_ APIs merely check that set end points are mutually
-    * consistent.
-    */
-   if (png_ptr != NULL && info_ptr != NULL &&
-      (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
-   {
-      png_debug1(1, "in %s retrieval function", "cHRM");
-
-      if (white_x != NULL)
-         *white_x = png_float(png_ptr,
-             info_ptr->colorspace.end_points_xy.whitex, "cHRM white X");
-      if (white_y != NULL)
-         *white_y = png_float(png_ptr,
-             info_ptr->colorspace.end_points_xy.whitey, "cHRM white Y");
-      if (red_x != NULL)
-         *red_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redx,
-             "cHRM red X");
-      if (red_y != NULL)
-         *red_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redy,
-             "cHRM red Y");
-      if (green_x != NULL)
-         *green_x = png_float(png_ptr,
-             info_ptr->colorspace.end_points_xy.greenx, "cHRM green X");
-      if (green_y != NULL)
-         *green_y = png_float(png_ptr,
-             info_ptr->colorspace.end_points_xy.greeny, "cHRM green Y");
-      if (blue_x != NULL)
-         *blue_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluex,
-             "cHRM blue X");
-      if (blue_y != NULL)
-         *blue_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluey,
-             "cHRM blue Y");
-      return (PNG_INFO_cHRM);
-   }
-
-   return (0);
-}
-
-png_uint_32 PNGAPI
-png_get_cHRM_XYZ(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    double *red_X, double *red_Y, double *red_Z, double *green_X,
-    double *green_Y, double *green_Z, double *blue_X, double *blue_Y,
-    double *blue_Z)
-{
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
-   {
-      png_debug1(1, "in %s retrieval function", "cHRM_XYZ(float)");
-
-      if (red_X != NULL)
-         *red_X = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_X,
-             "cHRM red X");
-      if (red_Y != NULL)
-         *red_Y = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Y,
-             "cHRM red Y");
-      if (red_Z != NULL)
-         *red_Z = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Z,
-             "cHRM red Z");
-      if (green_X != NULL)
-         *green_X = png_float(png_ptr,
-             info_ptr->colorspace.end_points_XYZ.green_X, "cHRM green X");
-      if (green_Y != NULL)
-         *green_Y = png_float(png_ptr,
-             info_ptr->colorspace.end_points_XYZ.green_Y, "cHRM green Y");
-      if (green_Z != NULL)
-         *green_Z = png_float(png_ptr,
-             info_ptr->colorspace.end_points_XYZ.green_Z, "cHRM green Z");
-      if (blue_X != NULL)
-         *blue_X = png_float(png_ptr,
-             info_ptr->colorspace.end_points_XYZ.blue_X, "cHRM blue X");
-      if (blue_Y != NULL)
-         *blue_Y = png_float(png_ptr,
-             info_ptr->colorspace.end_points_XYZ.blue_Y, "cHRM blue Y");
-      if (blue_Z != NULL)
-         *blue_Z = png_float(png_ptr,
-             info_ptr->colorspace.end_points_XYZ.blue_Z, "cHRM blue Z");
-      return (PNG_INFO_cHRM);
-   }
-
-   return (0);
-}
-#  endif
-
-#  ifdef PNG_FIXED_POINT_SUPPORTED
-png_uint_32 PNGAPI
-png_get_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    png_fixed_point *int_red_X, png_fixed_point *int_red_Y,
-    png_fixed_point *int_red_Z, png_fixed_point *int_green_X,
-    png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,
-    png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,
-    png_fixed_point *int_blue_Z)
-{
-   if (png_ptr != NULL && info_ptr != NULL &&
-      (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
-   {
-      png_debug1(1, "in %s retrieval function", "cHRM_XYZ");
-
-      if (int_red_X != NULL)
-         *int_red_X = info_ptr->colorspace.end_points_XYZ.red_X;
-      if (int_red_Y != NULL)
-         *int_red_Y = info_ptr->colorspace.end_points_XYZ.red_Y;
-      if (int_red_Z != NULL)
-         *int_red_Z = info_ptr->colorspace.end_points_XYZ.red_Z;
-      if (int_green_X != NULL)
-         *int_green_X = info_ptr->colorspace.end_points_XYZ.green_X;
-      if (int_green_Y != NULL)
-         *int_green_Y = info_ptr->colorspace.end_points_XYZ.green_Y;
-      if (int_green_Z != NULL)
-         *int_green_Z = info_ptr->colorspace.end_points_XYZ.green_Z;
-      if (int_blue_X != NULL)
-         *int_blue_X = info_ptr->colorspace.end_points_XYZ.blue_X;
-      if (int_blue_Y != NULL)
-         *int_blue_Y = info_ptr->colorspace.end_points_XYZ.blue_Y;
-      if (int_blue_Z != NULL)
-         *int_blue_Z = info_ptr->colorspace.end_points_XYZ.blue_Z;
-      return (PNG_INFO_cHRM);
-   }
-
-   return (0);
-}
-
-png_uint_32 PNGAPI
-png_get_cHRM_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
-    png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
-    png_fixed_point *blue_x, png_fixed_point *blue_y)
-{
-   png_debug1(1, "in %s retrieval function", "cHRM");
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-      (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
-   {
-      if (white_x != NULL)
-         *white_x = info_ptr->colorspace.end_points_xy.whitex;
-      if (white_y != NULL)
-         *white_y = info_ptr->colorspace.end_points_xy.whitey;
-      if (red_x != NULL)
-         *red_x = info_ptr->colorspace.end_points_xy.redx;
-      if (red_y != NULL)
-         *red_y = info_ptr->colorspace.end_points_xy.redy;
-      if (green_x != NULL)
-         *green_x = info_ptr->colorspace.end_points_xy.greenx;
-      if (green_y != NULL)
-         *green_y = info_ptr->colorspace.end_points_xy.greeny;
-      if (blue_x != NULL)
-         *blue_x = info_ptr->colorspace.end_points_xy.bluex;
-      if (blue_y != NULL)
-         *blue_y = info_ptr->colorspace.end_points_xy.bluey;
-      return (PNG_INFO_cHRM);
-   }
-
-   return (0);
-}
-#  endif
-#endif
-
-#ifdef PNG_gAMA_SUPPORTED
-#  ifdef PNG_FIXED_POINT_SUPPORTED
-png_uint_32 PNGAPI
-png_get_gAMA_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    png_fixed_point *file_gamma)
-{
-   png_debug1(1, "in %s retrieval function", "gAMA");
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&
-       file_gamma != NULL)
-   {
-      *file_gamma = info_ptr->colorspace.gamma;
-      return (PNG_INFO_gAMA);
-   }
-
-   return (0);
-}
-#  endif
-
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-png_uint_32 PNGAPI
-png_get_gAMA(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    double *file_gamma)
-{
-   png_debug1(1, "in %s retrieval function", "gAMA(float)");
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-      (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&
-      file_gamma != NULL)
-   {
-      *file_gamma = png_float(png_ptr, info_ptr->colorspace.gamma,
-          "png_get_gAMA");
-      return (PNG_INFO_gAMA);
-   }
-
-   return (0);
-}
-#  endif
-#endif
-
-#ifdef PNG_sRGB_SUPPORTED
-png_uint_32 PNGAPI
-png_get_sRGB(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    int *file_srgb_intent)
-{
-   png_debug1(1, "in %s retrieval function", "sRGB");
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-      (info_ptr->valid & PNG_INFO_sRGB) != 0 && file_srgb_intent != NULL)
-   {
-      *file_srgb_intent = info_ptr->colorspace.rendering_intent;
-      return (PNG_INFO_sRGB);
-   }
-
-   return (0);
-}
-#endif
-
-#ifdef PNG_iCCP_SUPPORTED
-png_uint_32 PNGAPI
-png_get_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_charpp name, int *compression_type,
-    png_bytepp profile, png_uint_32 *proflen)
-{
-   png_debug1(1, "in %s retrieval function", "iCCP");
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_iCCP) != 0 &&
-       name != NULL && compression_type != NULL && profile != NULL &&
-           proflen != NULL)
-   {
-      *name = info_ptr->iccp_name;
-      *profile = info_ptr->iccp_profile;
-      *proflen = png_get_uint_32(info_ptr->iccp_profile);
-      /* This is somewhat irrelevant since the profile data returned has
-       * actually been uncompressed.
-       */
-      *compression_type = PNG_COMPRESSION_TYPE_BASE;
-      return (PNG_INFO_iCCP);
-   }
-
-   return (0);
-}
-#endif
-
-#ifdef PNG_sPLT_SUPPORTED
-int PNGAPI
-png_get_sPLT(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_sPLT_tpp spalettes)
-{
-   if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
-   {
-      *spalettes = info_ptr->splt_palettes;
-      return info_ptr->splt_palettes_num;
-   }
-
-   return (0);
-}
-#endif
-
-#ifdef PNG_eXIf_SUPPORTED
-png_uint_32 PNGAPI
-png_get_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_bytep *exif)
-{
-  png_warning(png_ptr, "png_get_eXIf does not work; use png_get_eXIf_1");
-  PNG_UNUSED(info_ptr)
-  PNG_UNUSED(exif)
-  return 0;
-}
-
-png_uint_32 PNGAPI
-png_get_eXIf_1(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    png_uint_32 *num_exif, png_bytep *exif)
-{
-   png_debug1(1, "in %s retrieval function", "eXIf");
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_eXIf) != 0 && exif != NULL)
-   {
-      *num_exif = info_ptr->num_exif;
-      *exif = info_ptr->exif;
-      return (PNG_INFO_eXIf);
-   }
-
-   return (0);
-}
-#endif
-
-#ifdef PNG_hIST_SUPPORTED
-png_uint_32 PNGAPI
-png_get_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_uint_16p *hist)
-{
-   png_debug1(1, "in %s retrieval function", "hIST");
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_hIST) != 0 && hist != NULL)
-   {
-      *hist = info_ptr->hist;
-      return (PNG_INFO_hIST);
-   }
-
-   return (0);
-}
-#endif
-
-png_uint_32 PNGAPI
-png_get_IHDR(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    png_uint_32 *width, png_uint_32 *height, int *bit_depth,
-    int *color_type, int *interlace_type, int *compression_type,
-    int *filter_type)
-{
-   png_debug1(1, "in %s retrieval function", "IHDR");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return (0);
-
-   if (width != NULL)
-       *width = info_ptr->width;
-
-   if (height != NULL)
-       *height = info_ptr->height;
-
-   if (bit_depth != NULL)
-       *bit_depth = info_ptr->bit_depth;
-
-   if (color_type != NULL)
-       *color_type = info_ptr->color_type;
-
-   if (compression_type != NULL)
-      *compression_type = info_ptr->compression_type;
-
-   if (filter_type != NULL)
-      *filter_type = info_ptr->filter_type;
-
-   if (interlace_type != NULL)
-      *interlace_type = info_ptr->interlace_type;
-
-   /* This is redundant if we can be sure that the info_ptr values were all
-    * assigned in png_set_IHDR().  We do the check anyhow in case an
-    * application has ignored our advice not to mess with the members
-    * of info_ptr directly.
-    */
-   png_check_IHDR(png_ptr, info_ptr->width, info_ptr->height,
-       info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
-       info_ptr->compression_type, info_ptr->filter_type);
-
-   return (1);
-}
-
-#ifdef PNG_oFFs_SUPPORTED
-png_uint_32 PNGAPI
-png_get_oFFs(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
-{
-   png_debug1(1, "in %s retrieval function", "oFFs");
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_oFFs) != 0 &&
-       offset_x != NULL && offset_y != NULL && unit_type != NULL)
-   {
-      *offset_x = info_ptr->x_offset;
-      *offset_y = info_ptr->y_offset;
-      *unit_type = (int)info_ptr->offset_unit_type;
-      return (PNG_INFO_oFFs);
-   }
-
-   return (0);
-}
-#endif
-
-#ifdef PNG_pCAL_SUPPORTED
-png_uint_32 PNGAPI
-png_get_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
-    png_charp *units, png_charpp *params)
-{
-   png_debug1(1, "in %s retrieval function", "pCAL");
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_pCAL) != 0 &&
-       purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
-       nparams != NULL && units != NULL && params != NULL)
-   {
-      *purpose = info_ptr->pcal_purpose;
-      *X0 = info_ptr->pcal_X0;
-      *X1 = info_ptr->pcal_X1;
-      *type = (int)info_ptr->pcal_type;
-      *nparams = (int)info_ptr->pcal_nparams;
-      *units = info_ptr->pcal_units;
-      *params = info_ptr->pcal_params;
-      return (PNG_INFO_pCAL);
-   }
-
-   return (0);
-}
-#endif
-
-#ifdef PNG_sCAL_SUPPORTED
-#  ifdef PNG_FIXED_POINT_SUPPORTED
-#    if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \
-         defined(PNG_FLOATING_POINT_SUPPORTED)
-png_uint_32 PNGAPI
-png_get_sCAL_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    int *unit, png_fixed_point *width, png_fixed_point *height)
-{
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_sCAL) != 0)
-   {
-      *unit = info_ptr->scal_unit;
-      /*TODO: make this work without FP support; the API is currently eliminated
-       * if neither floating point APIs nor internal floating point arithmetic
-       * are enabled.
-       */
-      *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width");
-      *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height),
-          "sCAL height");
-      return (PNG_INFO_sCAL);
-   }
-
-   return(0);
-}
-#    endif /* FLOATING_ARITHMETIC */
-#  endif /* FIXED_POINT */
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-png_uint_32 PNGAPI
-png_get_sCAL(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    int *unit, double *width, double *height)
-{
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_sCAL) != 0)
-   {
-      *unit = info_ptr->scal_unit;
-      *width = atof(info_ptr->scal_s_width);
-      *height = atof(info_ptr->scal_s_height);
-      return (PNG_INFO_sCAL);
-   }
-
-   return(0);
-}
-#  endif /* FLOATING POINT */
-png_uint_32 PNGAPI
-png_get_sCAL_s(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    int *unit, png_charpp width, png_charpp height)
-{
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_sCAL) != 0)
-   {
-      *unit = info_ptr->scal_unit;
-      *width = info_ptr->scal_s_width;
-      *height = info_ptr->scal_s_height;
-      return (PNG_INFO_sCAL);
-   }
-
-   return(0);
-}
-#endif /* sCAL */
-
-#ifdef PNG_pHYs_SUPPORTED
-png_uint_32 PNGAPI
-png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr,
-    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
-{
-   png_uint_32 retval = 0;
-
-   png_debug1(1, "in %s retrieval function", "pHYs");
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_pHYs) != 0)
-   {
-      if (res_x != NULL)
-      {
-         *res_x = info_ptr->x_pixels_per_unit;
-         retval |= PNG_INFO_pHYs;
-      }
-
-      if (res_y != NULL)
-      {
-         *res_y = info_ptr->y_pixels_per_unit;
-         retval |= PNG_INFO_pHYs;
-      }
-
-      if (unit_type != NULL)
-      {
-         *unit_type = (int)info_ptr->phys_unit_type;
-         retval |= PNG_INFO_pHYs;
-      }
-   }
-
-   return (retval);
-}
-#endif /* pHYs */
-
-png_uint_32 PNGAPI
-png_get_PLTE(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_colorp *palette, int *num_palette)
-{
-   png_debug1(1, "in %s retrieval function", "PLTE");
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_PLTE) != 0 && palette != NULL)
-   {
-      *palette = info_ptr->palette;
-      *num_palette = info_ptr->num_palette;
-      png_debug1(3, "num_palette = %d", *num_palette);
-      return (PNG_INFO_PLTE);
-   }
-
-   return (0);
-}
-
-#ifdef PNG_sBIT_SUPPORTED
-png_uint_32 PNGAPI
-png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_color_8p *sig_bit)
-{
-   png_debug1(1, "in %s retrieval function", "sBIT");
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_sBIT) != 0 && sig_bit != NULL)
-   {
-      *sig_bit = &(info_ptr->sig_bit);
-      return (PNG_INFO_sBIT);
-   }
-
-   return (0);
-}
-#endif
-
-#ifdef PNG_TEXT_SUPPORTED
-int PNGAPI
-png_get_text(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_textp *text_ptr, int *num_text)
-{
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
-   {
-      png_debug1(1, "in 0x%lx retrieval function",
-         (unsigned long)png_ptr->chunk_name);
-
-      if (text_ptr != NULL)
-         *text_ptr = info_ptr->text;
-
-      if (num_text != NULL)
-         *num_text = info_ptr->num_text;
-
-      return info_ptr->num_text;
-   }
-
-   if (num_text != NULL)
-      *num_text = 0;
-
-   return(0);
-}
-#endif
-
-#ifdef PNG_tIME_SUPPORTED
-png_uint_32 PNGAPI
-png_get_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_timep *mod_time)
-{
-   png_debug1(1, "in %s retrieval function", "tIME");
-
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_tIME) != 0 && mod_time != NULL)
-   {
-      *mod_time = &(info_ptr->mod_time);
-      return (PNG_INFO_tIME);
-   }
-
-   return (0);
-}
-#endif
-
-#ifdef PNG_tRNS_SUPPORTED
-png_uint_32 PNGAPI
-png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
-{
-   png_uint_32 retval = 0;
-   if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_tRNS) != 0)
-   {
-      png_debug1(1, "in %s retrieval function", "tRNS");
-
-      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      {
-         if (trans_alpha != NULL)
-         {
-            *trans_alpha = info_ptr->trans_alpha;
-            retval |= PNG_INFO_tRNS;
-         }
-
-         if (trans_color != NULL)
-            *trans_color = &(info_ptr->trans_color);
-      }
-
-      else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
-      {
-         if (trans_color != NULL)
-         {
-            *trans_color = &(info_ptr->trans_color);
-            retval |= PNG_INFO_tRNS;
-         }
-
-         if (trans_alpha != NULL)
-            *trans_alpha = NULL;
-      }
-
-      if (num_trans != NULL)
-      {
-         *num_trans = info_ptr->num_trans;
-         retval |= PNG_INFO_tRNS;
-      }
-   }
-
-   return (retval);
-}
-#endif
-
-#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
-int PNGAPI
-png_get_unknown_chunks(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_unknown_chunkpp unknowns)
-{
-   if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
-   {
-      *unknowns = info_ptr->unknown_chunks;
-      return info_ptr->unknown_chunks_num;
-   }
-
-   return (0);
-}
-#endif
-
-#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-png_byte PNGAPI
-png_get_rgb_to_gray_status (png_const_structrp png_ptr)
-{
-   return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0);
-}
-#endif
-
-#ifdef PNG_USER_CHUNKS_SUPPORTED
-png_voidp PNGAPI
-png_get_user_chunk_ptr(png_const_structrp png_ptr)
-{
-   return (png_ptr ? png_ptr->user_chunk_ptr : NULL);
-}
-#endif
-
-png_size_t PNGAPI
-png_get_compression_buffer_size(png_const_structrp png_ptr)
-{
-   if (png_ptr == NULL)
-      return 0;
-
-#ifdef PNG_WRITE_SUPPORTED
-   if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
-#endif
-   {
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-      return png_ptr->IDAT_read_size;
-#else
-      return PNG_IDAT_READ_SIZE;
-#endif
-   }
-
-#ifdef PNG_WRITE_SUPPORTED
-   else
-      return png_ptr->zbuffer_size;
-#endif
-}
-
-#ifdef PNG_SET_USER_LIMITS_SUPPORTED
-/* These functions were added to libpng 1.2.6 and were enabled
- * by default in libpng-1.4.0 */
-png_uint_32 PNGAPI
-png_get_user_width_max (png_const_structrp png_ptr)
-{
-   return (png_ptr ? png_ptr->user_width_max : 0);
-}
-
-png_uint_32 PNGAPI
-png_get_user_height_max (png_const_structrp png_ptr)
-{
-   return (png_ptr ? png_ptr->user_height_max : 0);
-}
-
-/* This function was added to libpng 1.4.0 */
-png_uint_32 PNGAPI
-png_get_chunk_cache_max (png_const_structrp png_ptr)
-{
-   return (png_ptr ? png_ptr->user_chunk_cache_max : 0);
-}
-
-/* This function was added to libpng 1.4.1 */
-png_alloc_size_t PNGAPI
-png_get_chunk_malloc_max (png_const_structrp png_ptr)
-{
-   return (png_ptr ? png_ptr->user_chunk_malloc_max : 0);
-}
-#endif /* SET_USER_LIMITS */
-
-/* These functions were added to libpng 1.4.0 */
-#ifdef PNG_IO_STATE_SUPPORTED
-png_uint_32 PNGAPI
-png_get_io_state (png_const_structrp png_ptr)
-{
-   return png_ptr->io_state;
-}
-
-png_uint_32 PNGAPI
-png_get_io_chunk_type (png_const_structrp png_ptr)
-{
-   return png_ptr->chunk_name;
-}
-#endif /* IO_STATE */
-
-#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
-#  ifdef PNG_GET_PALETTE_MAX_SUPPORTED
-int PNGAPI
-png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      return png_ptr->num_palette_max;
-
-   return (-1);
-}
-#  endif
-#endif
-
-#endif /* READ || WRITE */
diff --git a/src/png/libpng/pnginfo.h b/src/png/libpng/pnginfo.h
deleted file mode 100644
index d5f6149db..000000000
--- a/src/png/libpng/pnginfo.h
+++ /dev/null
@@ -1,267 +0,0 @@
-
-/* pnginfo.h - header file for PNG reference library
- *
- * Last changed in libpng 1.6.1 [March 28, 2013]
- * Copyright (c) 1998-2002,2004,2006-2013 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
- /* png_info is a structure that holds the information in a PNG file so
- * that the application can find out the characteristics of the image.
- * If you are reading the file, this structure will tell you what is
- * in the PNG file.  If you are writing the file, fill in the information
- * you want to put into the PNG file, using png_set_*() functions, then
- * call png_write_info().
- *
- * The names chosen should be very close to the PNG specification, so
- * consult that document for information about the meaning of each field.
- *
- * With libpng < 0.95, it was only possible to directly set and read the
- * the values in the png_info_struct, which meant that the contents and
- * order of the values had to remain fixed.  With libpng 0.95 and later,
- * however, there are now functions that abstract the contents of
- * png_info_struct from the application, so this makes it easier to use
- * libpng with dynamic libraries, and even makes it possible to use
- * libraries that don't have all of the libpng ancillary chunk-handing
- * functionality.  In libpng-1.5.0 this was moved into a separate private
- * file that is not visible to applications.
- *
- * The following members may have allocated storage attached that should be
- * cleaned up before the structure is discarded: palette, trans, text,
- * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
- * splt_palettes, scal_unit, row_pointers, and unknowns.   By default, these
- * are automatically freed when the info structure is deallocated, if they were
- * allocated internally by libpng.  This behavior can be changed by means
- * of the png_data_freer() function.
- *
- * More allocation details: all the chunk-reading functions that
- * change these members go through the corresponding png_set_*
- * functions.  A function to clear these members is available: see
- * png_free_data().  The png_set_* functions do not depend on being
- * able to point info structure members to any of the storage they are
- * passed (they make their own copies), EXCEPT that the png_set_text
- * functions use the same storage passed to them in the text_ptr or
- * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
- * functions do not make their own copies.
- */
-#ifndef PNGINFO_H
-#define PNGINFO_H
-
-struct png_info_def
-{
-   /* The following are necessary for every PNG file */
-   png_uint_32 width;  /* width of image in pixels (from IHDR) */
-   png_uint_32 height; /* height of image in pixels (from IHDR) */
-   png_uint_32 valid;  /* valid chunk data (see PNG_INFO_ below) */
-   png_size_t rowbytes; /* bytes needed to hold an untransformed row */
-   png_colorp palette;      /* array of color values (valid & PNG_INFO_PLTE) */
-   png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
-   png_uint_16 num_trans;   /* number of transparent palette color (tRNS) */
-   png_byte bit_depth;      /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
-   png_byte color_type;     /* see PNG_COLOR_TYPE_ below (from IHDR) */
-   /* The following three should have been named *_method not *_type */
-   png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
-   png_byte filter_type;    /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
-   png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
-
-   /* The following are set by png_set_IHDR, called from the application on
-    * write, but the are never actually used by the write code.
-    */
-   png_byte channels;       /* number of data channels per pixel (1, 2, 3, 4) */
-   png_byte pixel_depth;    /* number of bits per pixel */
-   png_byte spare_byte;     /* to align the data, and for future use */
-
-#ifdef PNG_READ_SUPPORTED
-   /* This is never set during write */
-   png_byte signature[8];   /* magic bytes read by libpng from start of file */
-#endif
-
-   /* The rest of the data is optional.  If you are reading, check the
-    * valid field to see if the information in these are valid.  If you
-    * are writing, set the valid field to those chunks you want written,
-    * and initialize the appropriate fields below.
-    */
-
-#if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
-   /* png_colorspace only contains 'flags' if neither GAMMA or COLORSPACE are
-    * defined.  When COLORSPACE is switched on all the colorspace-defining
-    * chunks should be enabled, when GAMMA is switched on all the gamma-defining
-    * chunks should be enabled.  If this is not done it becomes possible to read
-    * inconsistent PNG files and assign a probably incorrect interpretation to
-    * the information.  (In other words, by carefully choosing which chunks to
-    * recognize the system configuration can select an interpretation for PNG
-    * files containing ambiguous data and this will result in inconsistent
-    * behavior between different libpng builds!)
-    */
-   png_colorspace colorspace;
-#endif
-
-#ifdef PNG_iCCP_SUPPORTED
-   /* iCCP chunk data. */
-   png_charp iccp_name;     /* profile name */
-   png_bytep iccp_profile;  /* International Color Consortium profile data */
-   png_uint_32 iccp_proflen;  /* ICC profile data length */
-#endif
-
-#ifdef PNG_TEXT_SUPPORTED
-   /* The tEXt, and zTXt chunks contain human-readable textual data in
-    * uncompressed, compressed, and optionally compressed forms, respectively.
-    * The data in "text" is an array of pointers to uncompressed,
-    * null-terminated C strings. Each chunk has a keyword that describes the
-    * textual data contained in that chunk.  Keywords are not required to be
-    * unique, and the text string may be empty.  Any number of text chunks may
-    * be in an image.
-    */
-   int num_text; /* number of comments read or comments to write */
-   int max_text; /* current size of text array */
-   png_textp text; /* array of comments read or comments to write */
-#endif /* TEXT */
-
-#ifdef PNG_tIME_SUPPORTED
-   /* The tIME chunk holds the last time the displayed image data was
-    * modified.  See the png_time struct for the contents of this struct.
-    */
-   png_time mod_time;
-#endif
-
-#ifdef PNG_sBIT_SUPPORTED
-   /* The sBIT chunk specifies the number of significant high-order bits
-    * in the pixel data.  Values are in the range [1, bit_depth], and are
-    * only specified for the channels in the pixel data.  The contents of
-    * the low-order bits is not specified.  Data is valid if
-    * (valid & PNG_INFO_sBIT) is non-zero.
-    */
-   png_color_8 sig_bit; /* significant bits in color channels */
-#endif
-
-#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
-defined(PNG_READ_BACKGROUND_SUPPORTED)
-   /* The tRNS chunk supplies transparency data for paletted images and
-    * other image types that don't need a full alpha channel.  There are
-    * "num_trans" transparency values for a paletted image, stored in the
-    * same order as the palette colors, starting from index 0.  Values
-    * for the data are in the range [0, 255], ranging from fully transparent
-    * to fully opaque, respectively.  For non-paletted images, there is a
-    * single color specified that should be treated as fully transparent.
-    * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
-    */
-   png_bytep trans_alpha;    /* alpha values for paletted image */
-   png_color_16 trans_color; /* transparent color for non-palette image */
-#endif
-
-#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   /* The bKGD chunk gives the suggested image background color if the
-    * display program does not have its own background color and the image
-    * is needs to composited onto a background before display.  The colors
-    * in "background" are normally in the same color space/depth as the
-    * pixel data.  Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
-    */
-   png_color_16 background;
-#endif
-
-#ifdef PNG_oFFs_SUPPORTED
-   /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
-    * and downwards from the top-left corner of the display, page, or other
-    * application-specific co-ordinate space.  See the PNG_OFFSET_ defines
-    * below for the unit types.  Valid if (valid & PNG_INFO_oFFs) non-zero.
-    */
-   png_int_32 x_offset; /* x offset on page */
-   png_int_32 y_offset; /* y offset on page */
-   png_byte offset_unit_type; /* offset units type */
-#endif
-
-#ifdef PNG_pHYs_SUPPORTED
-   /* The pHYs chunk gives the physical pixel density of the image for
-    * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
-    * defines below).  Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
-    */
-   png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
-   png_uint_32 y_pixels_per_unit; /* vertical pixel density */
-   png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
-#endif
-
-#ifdef PNG_eXIf_SUPPORTED
-   int num_exif;  /* Added at libpng-1.6.31 */
-   png_bytep exif;
-# ifdef PNG_READ_eXIf_SUPPORTED
-   png_bytep eXIf_buf;  /* Added at libpng-1.6.32 */
-# endif
-#endif
-
-#ifdef PNG_hIST_SUPPORTED
-   /* The hIST chunk contains the relative frequency or importance of the
-    * various palette entries, so that a viewer can intelligently select a
-    * reduced-color palette, if required.  Data is an array of "num_palette"
-    * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
-    * is non-zero.
-    */
-   png_uint_16p hist;
-#endif
-
-#ifdef PNG_pCAL_SUPPORTED
-   /* The pCAL chunk describes a transformation between the stored pixel
-    * values and original physical data values used to create the image.
-    * The integer range [0, 2^bit_depth - 1] maps to the floating-point
-    * range given by [pcal_X0, pcal_X1], and are further transformed by a
-    * (possibly non-linear) transformation function given by "pcal_type"
-    * and "pcal_params" into "pcal_units".  Please see the PNG_EQUATION_
-    * defines below, and the PNG-Group's PNG extensions document for a
-    * complete description of the transformations and how they should be
-    * implemented, and for a description of the ASCII parameter strings.
-    * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
-    */
-   png_charp pcal_purpose;  /* pCAL chunk description string */
-   png_int_32 pcal_X0;      /* minimum value */
-   png_int_32 pcal_X1;      /* maximum value */
-   png_charp pcal_units;    /* Latin-1 string giving physical units */
-   png_charpp pcal_params;  /* ASCII strings containing parameter values */
-   png_byte pcal_type;      /* equation type (see PNG_EQUATION_ below) */
-   png_byte pcal_nparams;   /* number of parameters given in pcal_params */
-#endif
-
-/* New members added in libpng-1.0.6 */
-   png_uint_32 free_me;     /* flags items libpng is responsible for freeing */
-
-#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
-   /* Storage for unknown chunks that the library doesn't recognize. */
-   png_unknown_chunkp unknown_chunks;
-
-   /* The type of this field is limited by the type of
-    * png_struct::user_chunk_cache_max, else overflow can occur.
-    */
-   int                unknown_chunks_num;
-#endif
-
-#ifdef PNG_sPLT_SUPPORTED
-   /* Data on sPLT chunks (there may be more than one). */
-   png_sPLT_tp splt_palettes;
-   int         splt_palettes_num; /* Match type returned by png_get API */
-#endif
-
-#ifdef PNG_sCAL_SUPPORTED
-   /* The sCAL chunk describes the actual physical dimensions of the
-    * subject matter of the graphic.  The chunk contains a unit specification
-    * a byte value, and two ASCII strings representing floating-point
-    * values.  The values are width and height corresponsing to one pixel
-    * in the image.  Data values are valid if (valid & PNG_INFO_sCAL) is
-    * non-zero.
-    */
-   png_byte scal_unit;         /* unit of physical scale */
-   png_charp scal_s_width;     /* string containing height */
-   png_charp scal_s_height;    /* string containing width */
-#endif
-
-#ifdef PNG_INFO_IMAGE_SUPPORTED
-   /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS)
-      non-zero */
-   /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
-   png_bytepp row_pointers;        /* the image bits */
-#endif
-
-};
-#endif /* PNGINFO_H */
diff --git a/src/png/libpng/pngmem.c b/src/png/libpng/pngmem.c
deleted file mode 100644
index ff3ef7e88..000000000
--- a/src/png/libpng/pngmem.c
+++ /dev/null
@@ -1,284 +0,0 @@
-
-/* pngmem.c - stub functions for memory allocation
- *
- * Last changed in libpng 1.6.26 [October 20, 2016]
- * Copyright (c) 1998-2002,2004,2006-2014,2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * This file provides a location for all memory allocation.  Users who
- * need special memory handling are expected to supply replacement
- * functions for png_malloc() and png_free(), and to use
- * png_create_read_struct_2() and png_create_write_struct_2() to
- * identify the replacement functions.
- */
-
-#include "pngpriv.h"
-
-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-/* Free a png_struct */
-void /* PRIVATE */
-png_destroy_png_struct(png_structrp png_ptr)
-{
-   if (png_ptr != NULL)
-   {
-      /* png_free might call png_error and may certainly call
-       * png_get_mem_ptr, so fake a temporary png_struct to support this.
-       */
-      png_struct dummy_struct = *png_ptr;
-      memset(png_ptr, 0, (sizeof *png_ptr));
-      png_free(&dummy_struct, png_ptr);
-
-#     ifdef PNG_SETJMP_SUPPORTED
-         /* We may have a jmp_buf left to deallocate. */
-         png_free_jmpbuf(&dummy_struct);
-#     endif
-   }
-}
-
-/* Allocate memory.  For reasonable files, size should never exceed
- * 64K.  However, zlib may allocate more than 64K if you don't tell
- * it not to.  See zconf.h and png.h for more information.  zlib does
- * need to allocate exactly 64K, so whatever you call here must
- * have the ability to do that.
- */
-PNG_FUNCTION(png_voidp,PNGAPI
-png_calloc,(png_const_structrp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
-{
-   png_voidp ret;
-
-   ret = png_malloc(png_ptr, size);
-
-   if (ret != NULL)
-      memset(ret, 0, size);
-
-   return ret;
-}
-
-/* png_malloc_base, an internal function added at libpng 1.6.0, does the work of
- * allocating memory, taking into account limits and PNG_USER_MEM_SUPPORTED.
- * Checking and error handling must happen outside this routine; it returns NULL
- * if the allocation cannot be done (for any reason.)
- */
-PNG_FUNCTION(png_voidp /* PRIVATE */,
-png_malloc_base,(png_const_structrp png_ptr, png_alloc_size_t size),
-    PNG_ALLOCATED)
-{
-   /* Moved to png_malloc_base from png_malloc_default in 1.6.0; the DOS
-    * allocators have also been removed in 1.6.0, so any 16-bit system now has
-    * to implement a user memory handler.  This checks to be sure it isn't
-    * called with big numbers.
-    */
-#ifndef PNG_USER_MEM_SUPPORTED
-   PNG_UNUSED(png_ptr)
-#endif
-
-   /* Some compilers complain that this is always true.  However, it
-    * can be false when integer overflow happens.
-    */
-   if (size > 0 && size <= PNG_SIZE_MAX
-#     ifdef PNG_MAX_MALLOC_64K
-         && size <= 65536U
-#     endif
-      )
-   {
-#ifdef PNG_USER_MEM_SUPPORTED
-      if (png_ptr != NULL && png_ptr->malloc_fn != NULL)
-         return png_ptr->malloc_fn(png_constcast(png_structrp,png_ptr), size);
-
-      else
-#endif
-         return malloc((size_t)size); /* checked for truncation above */
-   }
-
-   else
-      return NULL;
-}
-
-#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
-   defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
-/* This is really here only to work round a spurious warning in GCC 4.6 and 4.7
- * that arises because of the checks in png_realloc_array that are repeated in
- * png_malloc_array.
- */
-static png_voidp
-png_malloc_array_checked(png_const_structrp png_ptr, int nelements,
-    size_t element_size)
-{
-   png_alloc_size_t req = (png_alloc_size_t)nelements; /* known to be > 0 */
-
-   if (req <= PNG_SIZE_MAX/element_size)
-      return png_malloc_base(png_ptr, req * element_size);
-
-   /* The failure case when the request is too large */
-   return NULL;
-}
-
-PNG_FUNCTION(png_voidp /* PRIVATE */,
-png_malloc_array,(png_const_structrp png_ptr, int nelements,
-    size_t element_size),PNG_ALLOCATED)
-{
-   if (nelements <= 0 || element_size == 0)
-      png_error(png_ptr, "internal error: array alloc");
-
-   return png_malloc_array_checked(png_ptr, nelements, element_size);
-}
-
-PNG_FUNCTION(png_voidp /* PRIVATE */,
-png_realloc_array,(png_const_structrp png_ptr, png_const_voidp old_array,
-    int old_elements, int add_elements, size_t element_size),PNG_ALLOCATED)
-{
-   /* These are internal errors: */
-   if (add_elements <= 0 || element_size == 0 || old_elements < 0 ||
-      (old_array == NULL && old_elements > 0))
-      png_error(png_ptr, "internal error: array realloc");
-
-   /* Check for overflow on the elements count (so the caller does not have to
-    * check.)
-    */
-   if (add_elements <= INT_MAX - old_elements)
-   {
-      png_voidp new_array = png_malloc_array_checked(png_ptr,
-          old_elements+add_elements, element_size);
-
-      if (new_array != NULL)
-      {
-         /* Because png_malloc_array worked the size calculations below cannot
-          * overflow.
-          */
-         if (old_elements > 0)
-            memcpy(new_array, old_array, element_size*(unsigned)old_elements);
-
-         memset((char*)new_array + element_size*(unsigned)old_elements, 0,
-             element_size*(unsigned)add_elements);
-
-         return new_array;
-      }
-   }
-
-   return NULL; /* error */
-}
-#endif /* TEXT || sPLT || STORE_UNKNOWN_CHUNKS */
-
-/* Various functions that have different error handling are derived from this.
- * png_malloc always exists, but if PNG_USER_MEM_SUPPORTED is defined a separate
- * function png_malloc_default is also provided.
- */
-PNG_FUNCTION(png_voidp,PNGAPI
-png_malloc,(png_const_structrp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
-{
-   png_voidp ret;
-
-   if (png_ptr == NULL)
-      return NULL;
-
-   ret = png_malloc_base(png_ptr, size);
-
-   if (ret == NULL)
-       png_error(png_ptr, "Out of memory"); /* 'm' means png_malloc */
-
-   return ret;
-}
-
-#ifdef PNG_USER_MEM_SUPPORTED
-PNG_FUNCTION(png_voidp,PNGAPI
-png_malloc_default,(png_const_structrp png_ptr, png_alloc_size_t size),
-    PNG_ALLOCATED PNG_DEPRECATED)
-{
-   png_voidp ret;
-
-   if (png_ptr == NULL)
-      return NULL;
-
-   /* Passing 'NULL' here bypasses the application provided memory handler. */
-   ret = png_malloc_base(NULL/*use malloc*/, size);
-
-   if (ret == NULL)
-      png_error(png_ptr, "Out of Memory"); /* 'M' means png_malloc_default */
-
-   return ret;
-}
-#endif /* USER_MEM */
-
-/* This function was added at libpng version 1.2.3.  The png_malloc_warn()
- * function will issue a png_warning and return NULL instead of issuing a
- * png_error, if it fails to allocate the requested memory.
- */
-PNG_FUNCTION(png_voidp,PNGAPI
-png_malloc_warn,(png_const_structrp png_ptr, png_alloc_size_t size),
-    PNG_ALLOCATED)
-{
-   if (png_ptr != NULL)
-   {
-      png_voidp ret = png_malloc_base(png_ptr, size);
-
-      if (ret != NULL)
-         return ret;
-
-      png_warning(png_ptr, "Out of memory");
-   }
-
-   return NULL;
-}
-
-/* Free a pointer allocated by png_malloc().  If ptr is NULL, return
- * without taking any action.
- */
-void PNGAPI
-png_free(png_const_structrp png_ptr, png_voidp ptr)
-{
-   if (png_ptr == NULL || ptr == NULL)
-      return;
-
-#ifdef PNG_USER_MEM_SUPPORTED
-   if (png_ptr->free_fn != NULL)
-      png_ptr->free_fn(png_constcast(png_structrp,png_ptr), ptr);
-
-   else
-      png_free_default(png_ptr, ptr);
-}
-
-PNG_FUNCTION(void,PNGAPI
-png_free_default,(png_const_structrp png_ptr, png_voidp ptr),PNG_DEPRECATED)
-{
-   if (png_ptr == NULL || ptr == NULL)
-      return;
-#endif /* USER_MEM */
-
-   free(ptr);
-}
-
-#ifdef PNG_USER_MEM_SUPPORTED
-/* This function is called when the application wants to use another method
- * of allocating and freeing memory.
- */
-void PNGAPI
-png_set_mem_fn(png_structrp png_ptr, png_voidp mem_ptr, png_malloc_ptr
-  malloc_fn, png_free_ptr free_fn)
-{
-   if (png_ptr != NULL)
-   {
-      png_ptr->mem_ptr = mem_ptr;
-      png_ptr->malloc_fn = malloc_fn;
-      png_ptr->free_fn = free_fn;
-   }
-}
-
-/* This function returns a pointer to the mem_ptr associated with the user
- * functions.  The application should free any memory associated with this
- * pointer before png_write_destroy and png_read_destroy are called.
- */
-png_voidp PNGAPI
-png_get_mem_ptr(png_const_structrp png_ptr)
-{
-   if (png_ptr == NULL)
-      return NULL;
-
-   return png_ptr->mem_ptr;
-}
-#endif /* USER_MEM */
-#endif /* READ || WRITE */
diff --git a/src/png/libpng/pngpread.c b/src/png/libpng/pngpread.c
deleted file mode 100644
index fbe361dc3..000000000
--- a/src/png/libpng/pngpread.c
+++ /dev/null
@@ -1,1096 +0,0 @@
-
-/* pngpread.c - read a png file in push mode
- *
- * Last changed in libpng 1.6.32 [August 24, 2017]
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#include "pngpriv.h"
-
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-
-/* Push model modes */
-#define PNG_READ_SIG_MODE   0
-#define PNG_READ_CHUNK_MODE 1
-#define PNG_READ_IDAT_MODE  2
-#define PNG_READ_tEXt_MODE  4
-#define PNG_READ_zTXt_MODE  5
-#define PNG_READ_DONE_MODE  6
-#define PNG_READ_iTXt_MODE  7
-#define PNG_ERROR_MODE      8
-
-#define PNG_PUSH_SAVE_BUFFER_IF_FULL \
-if (png_ptr->push_length + 4 > png_ptr->buffer_size) \
-   { png_push_save_buffer(png_ptr); return; }
-#define PNG_PUSH_SAVE_BUFFER_IF_LT(N) \
-if (png_ptr->buffer_size < N) \
-   { png_push_save_buffer(png_ptr); return; }
-
-void PNGAPI
-png_process_data(png_structrp png_ptr, png_inforp info_ptr,
-    png_bytep buffer, png_size_t buffer_size)
-{
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   png_push_restore_buffer(png_ptr, buffer, buffer_size);
-
-   while (png_ptr->buffer_size)
-   {
-      png_process_some_data(png_ptr, info_ptr);
-   }
-}
-
-png_size_t PNGAPI
-png_process_data_pause(png_structrp png_ptr, int save)
-{
-   if (png_ptr != NULL)
-   {
-      /* It's easiest for the caller if we do the save; then the caller doesn't
-       * have to supply the same data again:
-       */
-      if (save != 0)
-         png_push_save_buffer(png_ptr);
-      else
-      {
-         /* This includes any pending saved bytes: */
-         png_size_t remaining = png_ptr->buffer_size;
-         png_ptr->buffer_size = 0;
-
-         /* So subtract the saved buffer size, unless all the data
-          * is actually 'saved', in which case we just return 0
-          */
-         if (png_ptr->save_buffer_size < remaining)
-            return remaining - png_ptr->save_buffer_size;
-      }
-   }
-
-   return 0;
-}
-
-png_uint_32 PNGAPI
-png_process_data_skip(png_structrp png_ptr)
-{
-/* TODO: Deprecate and remove this API.
- * Somewhere the implementation of this seems to have been lost,
- * or abandoned.  It was only to support some internal back-door access
- * to png_struct) in libpng-1.4.x.
- */
-   png_app_warning(png_ptr,
-"png_process_data_skip is not implemented in any current version of libpng");
-   return 0;
-}
-
-/* What we do with the incoming data depends on what we were previously
- * doing before we ran out of data...
- */
-void /* PRIVATE */
-png_process_some_data(png_structrp png_ptr, png_inforp info_ptr)
-{
-   if (png_ptr == NULL)
-      return;
-
-   switch (png_ptr->process_mode)
-   {
-      case PNG_READ_SIG_MODE:
-      {
-         png_push_read_sig(png_ptr, info_ptr);
-         break;
-      }
-
-      case PNG_READ_CHUNK_MODE:
-      {
-         png_push_read_chunk(png_ptr, info_ptr);
-         break;
-      }
-
-      case PNG_READ_IDAT_MODE:
-      {
-         png_push_read_IDAT(png_ptr);
-         break;
-      }
-
-      default:
-      {
-         png_ptr->buffer_size = 0;
-         break;
-      }
-   }
-}
-
-/* Read any remaining signature bytes from the stream and compare them with
- * the correct PNG signature.  It is possible that this routine is called
- * with bytes already read from the signature, either because they have been
- * checked by the calling application, or because of multiple calls to this
- * routine.
- */
-void /* PRIVATE */
-png_push_read_sig(png_structrp png_ptr, png_inforp info_ptr)
-{
-   png_size_t num_checked = png_ptr->sig_bytes, /* SAFE, does not exceed 8 */
-       num_to_check = 8 - num_checked;
-
-   if (png_ptr->buffer_size < num_to_check)
-   {
-      num_to_check = png_ptr->buffer_size;
-   }
-
-   png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]),
-       num_to_check);
-   png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes + num_to_check);
-
-   if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
-   {
-      if (num_checked < 4 &&
-          png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
-         png_error(png_ptr, "Not a PNG file");
-
-      else
-         png_error(png_ptr, "PNG file corrupted by ASCII conversion");
-   }
-   else
-   {
-      if (png_ptr->sig_bytes >= 8)
-      {
-         png_ptr->process_mode = PNG_READ_CHUNK_MODE;
-      }
-   }
-}
-
-void /* PRIVATE */
-png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr)
-{
-   png_uint_32 chunk_name;
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-   int keep; /* unknown handling method */
-#endif
-
-   /* First we make sure we have enough data for the 4-byte chunk name
-    * and the 4-byte chunk length before proceeding with decoding the
-    * chunk data.  To fully decode each of these chunks, we also make
-    * sure we have enough data in the buffer for the 4-byte CRC at the
-    * end of every chunk (except IDAT, which is handled separately).
-    */
-   if ((png_ptr->mode & PNG_HAVE_CHUNK_HEADER) == 0)
-   {
-      png_byte chunk_length[4];
-      png_byte chunk_tag[4];
-
-      PNG_PUSH_SAVE_BUFFER_IF_LT(8)
-      png_push_fill_buffer(png_ptr, chunk_length, 4);
-      png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
-      png_reset_crc(png_ptr);
-      png_crc_read(png_ptr, chunk_tag, 4);
-      png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(chunk_tag);
-      png_check_chunk_name(png_ptr, png_ptr->chunk_name);
-      png_check_chunk_length(png_ptr, png_ptr->push_length);
-      png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
-   }
-
-   chunk_name = png_ptr->chunk_name;
-
-   if (chunk_name == png_IDAT)
-   {
-      if ((png_ptr->mode & PNG_AFTER_IDAT) != 0)
-         png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
-
-      /* If we reach an IDAT chunk, this means we have read all of the
-       * header chunks, and we can start reading the image (or if this
-       * is called after the image has been read - we have an error).
-       */
-      if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-         png_error(png_ptr, "Missing IHDR before IDAT");
-
-      else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
-          (png_ptr->mode & PNG_HAVE_PLTE) == 0)
-         png_error(png_ptr, "Missing PLTE before IDAT");
-
-      png_ptr->process_mode = PNG_READ_IDAT_MODE;
-
-      if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
-         if ((png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT) == 0)
-            if (png_ptr->push_length == 0)
-               return;
-
-      png_ptr->mode |= PNG_HAVE_IDAT;
-
-      if ((png_ptr->mode & PNG_AFTER_IDAT) != 0)
-         png_benign_error(png_ptr, "Too many IDATs found");
-   }
-
-   if (chunk_name == png_IHDR)
-   {
-      if (png_ptr->push_length != 13)
-         png_error(png_ptr, "Invalid IHDR length");
-
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-   else if (chunk_name == png_IEND)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
-
-      png_ptr->process_mode = PNG_READ_DONE_MODE;
-      png_push_have_end(png_ptr, info_ptr);
-   }
-
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-   else if ((keep = png_chunk_unknown_handling(png_ptr, chunk_name)) != 0)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length, keep);
-
-      if (chunk_name == png_PLTE)
-         png_ptr->mode |= PNG_HAVE_PLTE;
-   }
-#endif
-
-   else if (chunk_name == png_PLTE)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-   else if (chunk_name == png_IDAT)
-   {
-      png_ptr->idat_size = png_ptr->push_length;
-      png_ptr->process_mode = PNG_READ_IDAT_MODE;
-      png_push_have_info(png_ptr, info_ptr);
-      png_ptr->zstream.avail_out =
-          (uInt) PNG_ROWBYTES(png_ptr->pixel_depth,
-          png_ptr->iwidth) + 1;
-      png_ptr->zstream.next_out = png_ptr->row_buf;
-      return;
-   }
-
-#ifdef PNG_READ_gAMA_SUPPORTED
-   else if (png_ptr->chunk_name == png_gAMA)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_sBIT_SUPPORTED
-   else if (png_ptr->chunk_name == png_sBIT)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_cHRM_SUPPORTED
-   else if (png_ptr->chunk_name == png_cHRM)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_sRGB_SUPPORTED
-   else if (chunk_name == png_sRGB)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_iCCP_SUPPORTED
-   else if (png_ptr->chunk_name == png_iCCP)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_sPLT_SUPPORTED
-   else if (chunk_name == png_sPLT)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_tRNS_SUPPORTED
-   else if (chunk_name == png_tRNS)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_bKGD_SUPPORTED
-   else if (chunk_name == png_bKGD)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_hIST_SUPPORTED
-   else if (chunk_name == png_hIST)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_pHYs_SUPPORTED
-   else if (chunk_name == png_pHYs)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_oFFs_SUPPORTED
-   else if (chunk_name == png_oFFs)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-
-#ifdef PNG_READ_pCAL_SUPPORTED
-   else if (chunk_name == png_pCAL)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_sCAL_SUPPORTED
-   else if (chunk_name == png_sCAL)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_tIME_SUPPORTED
-   else if (chunk_name == png_tIME)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_tEXt_SUPPORTED
-   else if (chunk_name == png_tEXt)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_zTXt_SUPPORTED
-   else if (chunk_name == png_zTXt)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
-   }
-
-#endif
-#ifdef PNG_READ_iTXt_SUPPORTED
-   else if (chunk_name == png_iTXt)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
-   }
-#endif
-
-   else
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_FULL
-      png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length,
-          PNG_HANDLE_CHUNK_AS_DEFAULT);
-   }
-
-   png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
-}
-
-void PNGCBAPI
-png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
-{
-   png_bytep ptr;
-
-   if (png_ptr == NULL)
-      return;
-
-   ptr = buffer;
-   if (png_ptr->save_buffer_size != 0)
-   {
-      png_size_t save_size;
-
-      if (length < png_ptr->save_buffer_size)
-         save_size = length;
-
-      else
-         save_size = png_ptr->save_buffer_size;
-
-      memcpy(ptr, png_ptr->save_buffer_ptr, save_size);
-      length -= save_size;
-      ptr += save_size;
-      png_ptr->buffer_size -= save_size;
-      png_ptr->save_buffer_size -= save_size;
-      png_ptr->save_buffer_ptr += save_size;
-   }
-   if (length != 0 && png_ptr->current_buffer_size != 0)
-   {
-      png_size_t save_size;
-
-      if (length < png_ptr->current_buffer_size)
-         save_size = length;
-
-      else
-         save_size = png_ptr->current_buffer_size;
-
-      memcpy(ptr, png_ptr->current_buffer_ptr, save_size);
-      png_ptr->buffer_size -= save_size;
-      png_ptr->current_buffer_size -= save_size;
-      png_ptr->current_buffer_ptr += save_size;
-   }
-}
-
-void /* PRIVATE */
-png_push_save_buffer(png_structrp png_ptr)
-{
-   if (png_ptr->save_buffer_size != 0)
-   {
-      if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
-      {
-         png_size_t i, istop;
-         png_bytep sp;
-         png_bytep dp;
-
-         istop = png_ptr->save_buffer_size;
-         for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer;
-             i < istop; i++, sp++, dp++)
-         {
-            *dp = *sp;
-         }
-      }
-   }
-   if (png_ptr->save_buffer_size + png_ptr->current_buffer_size >
-       png_ptr->save_buffer_max)
-   {
-      png_size_t new_max;
-      png_bytep old_buffer;
-
-      if (png_ptr->save_buffer_size > PNG_SIZE_MAX -
-          (png_ptr->current_buffer_size + 256))
-      {
-         png_error(png_ptr, "Potential overflow of save_buffer");
-      }
-
-      new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
-      old_buffer = png_ptr->save_buffer;
-      png_ptr->save_buffer = (png_bytep)png_malloc_warn(png_ptr,
-          (png_size_t)new_max);
-
-      if (png_ptr->save_buffer == NULL)
-      {
-         png_free(png_ptr, old_buffer);
-         png_error(png_ptr, "Insufficient memory for save_buffer");
-      }
-
-      if (old_buffer)
-         memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
-      else if (png_ptr->save_buffer_size)
-         png_error(png_ptr, "save_buffer error");
-      png_free(png_ptr, old_buffer);
-      png_ptr->save_buffer_max = new_max;
-   }
-   if (png_ptr->current_buffer_size)
-   {
-      memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size,
-         png_ptr->current_buffer_ptr, png_ptr->current_buffer_size);
-      png_ptr->save_buffer_size += png_ptr->current_buffer_size;
-      png_ptr->current_buffer_size = 0;
-   }
-   png_ptr->save_buffer_ptr = png_ptr->save_buffer;
-   png_ptr->buffer_size = 0;
-}
-
-void /* PRIVATE */
-png_push_restore_buffer(png_structrp png_ptr, png_bytep buffer,
-    png_size_t buffer_length)
-{
-   png_ptr->current_buffer = buffer;
-   png_ptr->current_buffer_size = buffer_length;
-   png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size;
-   png_ptr->current_buffer_ptr = png_ptr->current_buffer;
-}
-
-void /* PRIVATE */
-png_push_read_IDAT(png_structrp png_ptr)
-{
-   if ((png_ptr->mode & PNG_HAVE_CHUNK_HEADER) == 0)
-   {
-      png_byte chunk_length[4];
-      png_byte chunk_tag[4];
-
-      /* TODO: this code can be commoned up with the same code in push_read */
-      PNG_PUSH_SAVE_BUFFER_IF_LT(8)
-      png_push_fill_buffer(png_ptr, chunk_length, 4);
-      png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
-      png_reset_crc(png_ptr);
-      png_crc_read(png_ptr, chunk_tag, 4);
-      png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(chunk_tag);
-      png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
-
-      if (png_ptr->chunk_name != png_IDAT)
-      {
-         png_ptr->process_mode = PNG_READ_CHUNK_MODE;
-
-         if ((png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED) == 0)
-            png_error(png_ptr, "Not enough compressed data");
-
-         return;
-      }
-
-      png_ptr->idat_size = png_ptr->push_length;
-   }
-
-   if (png_ptr->idat_size != 0 && png_ptr->save_buffer_size != 0)
-   {
-      png_size_t save_size = png_ptr->save_buffer_size;
-      png_uint_32 idat_size = png_ptr->idat_size;
-
-      /* We want the smaller of 'idat_size' and 'current_buffer_size', but they
-       * are of different types and we don't know which variable has the fewest
-       * bits.  Carefully select the smaller and cast it to the type of the
-       * larger - this cannot overflow.  Do not cast in the following test - it
-       * will break on either 16-bit or 64-bit platforms.
-       */
-      if (idat_size < save_size)
-         save_size = (png_size_t)idat_size;
-
-      else
-         idat_size = (png_uint_32)save_size;
-
-      png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
-
-      png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
-
-      png_ptr->idat_size -= idat_size;
-      png_ptr->buffer_size -= save_size;
-      png_ptr->save_buffer_size -= save_size;
-      png_ptr->save_buffer_ptr += save_size;
-   }
-
-   if (png_ptr->idat_size != 0 && png_ptr->current_buffer_size != 0)
-   {
-      png_size_t save_size = png_ptr->current_buffer_size;
-      png_uint_32 idat_size = png_ptr->idat_size;
-
-      /* We want the smaller of 'idat_size' and 'current_buffer_size', but they
-       * are of different types and we don't know which variable has the fewest
-       * bits.  Carefully select the smaller and cast it to the type of the
-       * larger - this cannot overflow.
-       */
-      if (idat_size < save_size)
-         save_size = (png_size_t)idat_size;
-
-      else
-         idat_size = (png_uint_32)save_size;
-
-      png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
-
-      png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);
-
-      png_ptr->idat_size -= idat_size;
-      png_ptr->buffer_size -= save_size;
-      png_ptr->current_buffer_size -= save_size;
-      png_ptr->current_buffer_ptr += save_size;
-   }
-
-   if (png_ptr->idat_size == 0)
-   {
-      PNG_PUSH_SAVE_BUFFER_IF_LT(4)
-      png_crc_finish(png_ptr, 0);
-      png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
-      png_ptr->mode |= PNG_AFTER_IDAT;
-      png_ptr->zowner = 0;
-   }
-}
-
-void /* PRIVATE */
-png_process_IDAT_data(png_structrp png_ptr, png_bytep buffer,
-    png_size_t buffer_length)
-{
-   /* The caller checks for a non-zero buffer length. */
-   if (!(buffer_length > 0) || buffer == NULL)
-      png_error(png_ptr, "No IDAT data (internal error)");
-
-   /* This routine must process all the data it has been given
-    * before returning, calling the row callback as required to
-    * handle the uncompressed results.
-    */
-   png_ptr->zstream.next_in = buffer;
-   /* TODO: WARNING: TRUNCATION ERROR: DANGER WILL ROBINSON: */
-   png_ptr->zstream.avail_in = (uInt)buffer_length;
-
-   /* Keep going until the decompressed data is all processed
-    * or the stream marked as finished.
-    */
-   while (png_ptr->zstream.avail_in > 0 &&
-      (png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED) == 0)
-   {
-      int ret;
-
-      /* We have data for zlib, but we must check that zlib
-       * has someplace to put the results.  It doesn't matter
-       * if we don't expect any results -- it may be the input
-       * data is just the LZ end code.
-       */
-      if (!(png_ptr->zstream.avail_out > 0))
-      {
-         /* TODO: WARNING: TRUNCATION ERROR: DANGER WILL ROBINSON: */
-         png_ptr->zstream.avail_out = (uInt)(PNG_ROWBYTES(png_ptr->pixel_depth,
-             png_ptr->iwidth) + 1);
-
-         png_ptr->zstream.next_out = png_ptr->row_buf;
-      }
-
-      /* Using Z_SYNC_FLUSH here means that an unterminated
-       * LZ stream (a stream with a missing end code) can still
-       * be handled, otherwise (Z_NO_FLUSH) a future zlib
-       * implementation might defer output and therefore
-       * change the current behavior (see comments in inflate.c
-       * for why this doesn't happen at present with zlib 1.2.5).
-       */
-      ret = PNG_INFLATE(png_ptr, Z_SYNC_FLUSH);
-
-      /* Check for any failure before proceeding. */
-      if (ret != Z_OK && ret != Z_STREAM_END)
-      {
-         /* Terminate the decompression. */
-         png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
-         png_ptr->zowner = 0;
-
-         /* This may be a truncated stream (missing or
-          * damaged end code).  Treat that as a warning.
-          */
-         if (png_ptr->row_number >= png_ptr->num_rows ||
-             png_ptr->pass > 6)
-            png_warning(png_ptr, "Truncated compressed data in IDAT");
-
-         else
-         {
-            if (ret == Z_DATA_ERROR)
-               png_benign_error(png_ptr, "IDAT: ADLER32 checksum mismatch");
-            else
-               png_error(png_ptr, "Decompression error in IDAT");
-         }
-
-         /* Skip the check on unprocessed input */
-         return;
-      }
-
-      /* Did inflate output any data? */
-      if (png_ptr->zstream.next_out != png_ptr->row_buf)
-      {
-         /* Is this unexpected data after the last row?
-          * If it is, artificially terminate the LZ output
-          * here.
-          */
-         if (png_ptr->row_number >= png_ptr->num_rows ||
-             png_ptr->pass > 6)
-         {
-            /* Extra data. */
-            png_warning(png_ptr, "Extra compressed data in IDAT");
-            png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
-            png_ptr->zowner = 0;
-
-            /* Do no more processing; skip the unprocessed
-             * input check below.
-             */
-            return;
-         }
-
-         /* Do we have a complete row? */
-         if (png_ptr->zstream.avail_out == 0)
-            png_push_process_row(png_ptr);
-      }
-
-      /* And check for the end of the stream. */
-      if (ret == Z_STREAM_END)
-         png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
-   }
-
-   /* All the data should have been processed, if anything
-    * is left at this point we have bytes of IDAT data
-    * after the zlib end code.
-    */
-   if (png_ptr->zstream.avail_in > 0)
-      png_warning(png_ptr, "Extra compression data in IDAT");
-}
-
-void /* PRIVATE */
-png_push_process_row(png_structrp png_ptr)
-{
-   /* 1.5.6: row_info moved out of png_struct to a local here. */
-   png_row_info row_info;
-
-   row_info.width = png_ptr->iwidth; /* NOTE: width of current interlaced row */
-   row_info.color_type = png_ptr->color_type;
-   row_info.bit_depth = png_ptr->bit_depth;
-   row_info.channels = png_ptr->channels;
-   row_info.pixel_depth = png_ptr->pixel_depth;
-   row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width);
-
-   if (png_ptr->row_buf[0] > PNG_FILTER_VALUE_NONE)
-   {
-      if (png_ptr->row_buf[0] < PNG_FILTER_VALUE_LAST)
-         png_read_filter_row(png_ptr, &row_info, png_ptr->row_buf + 1,
-            png_ptr->prev_row + 1, png_ptr->row_buf[0]);
-      else
-         png_error(png_ptr, "bad adaptive filter value");
-   }
-
-   /* libpng 1.5.6: the following line was copying png_ptr->rowbytes before
-    * 1.5.6, while the buffer really is this big in current versions of libpng
-    * it may not be in the future, so this was changed just to copy the
-    * interlaced row count:
-    */
-   memcpy(png_ptr->prev_row, png_ptr->row_buf, row_info.rowbytes + 1);
-
-#ifdef PNG_READ_TRANSFORMS_SUPPORTED
-   if (png_ptr->transformations != 0)
-      png_do_read_transformations(png_ptr, &row_info);
-#endif
-
-   /* The transformed pixel depth should match the depth now in row_info. */
-   if (png_ptr->transformed_pixel_depth == 0)
-   {
-      png_ptr->transformed_pixel_depth = row_info.pixel_depth;
-      if (row_info.pixel_depth > png_ptr->maximum_pixel_depth)
-         png_error(png_ptr, "progressive row overflow");
-   }
-
-   else if (png_ptr->transformed_pixel_depth != row_info.pixel_depth)
-      png_error(png_ptr, "internal progressive row size calculation error");
-
-
-#ifdef PNG_READ_INTERLACING_SUPPORTED
-   /* Expand interlaced rows to full size */
-   if (png_ptr->interlaced != 0 &&
-       (png_ptr->transformations & PNG_INTERLACE) != 0)
-   {
-      if (png_ptr->pass < 6)
-         png_do_read_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass,
-             png_ptr->transformations);
-
-      switch (png_ptr->pass)
-      {
-         case 0:
-         {
-            int i;
-            for (i = 0; i < 8 && png_ptr->pass == 0; i++)
-            {
-               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr); /* Updates png_ptr->pass */
-            }
-
-            if (png_ptr->pass == 2) /* Pass 1 might be empty */
-            {
-               for (i = 0; i < 4 && png_ptr->pass == 2; i++)
-               {
-                  png_push_have_row(png_ptr, NULL);
-                  png_read_push_finish_row(png_ptr);
-               }
-            }
-
-            if (png_ptr->pass == 4 && png_ptr->height <= 4)
-            {
-               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
-               {
-                  png_push_have_row(png_ptr, NULL);
-                  png_read_push_finish_row(png_ptr);
-               }
-            }
-
-            if (png_ptr->pass == 6 && png_ptr->height <= 4)
-            {
-                png_push_have_row(png_ptr, NULL);
-                png_read_push_finish_row(png_ptr);
-            }
-
-            break;
-         }
-
-         case 1:
-         {
-            int i;
-            for (i = 0; i < 8 && png_ptr->pass == 1; i++)
-            {
-               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr);
-            }
-
-            if (png_ptr->pass == 2) /* Skip top 4 generated rows */
-            {
-               for (i = 0; i < 4 && png_ptr->pass == 2; i++)
-               {
-                  png_push_have_row(png_ptr, NULL);
-                  png_read_push_finish_row(png_ptr);
-               }
-            }
-
-            break;
-         }
-
-         case 2:
-         {
-            int i;
-
-            for (i = 0; i < 4 && png_ptr->pass == 2; i++)
-            {
-               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr);
-            }
-
-            for (i = 0; i < 4 && png_ptr->pass == 2; i++)
-            {
-               png_push_have_row(png_ptr, NULL);
-               png_read_push_finish_row(png_ptr);
-            }
-
-            if (png_ptr->pass == 4) /* Pass 3 might be empty */
-            {
-               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
-               {
-                  png_push_have_row(png_ptr, NULL);
-                  png_read_push_finish_row(png_ptr);
-               }
-            }
-
-            break;
-         }
-
-         case 3:
-         {
-            int i;
-
-            for (i = 0; i < 4 && png_ptr->pass == 3; i++)
-            {
-               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr);
-            }
-
-            if (png_ptr->pass == 4) /* Skip top two generated rows */
-            {
-               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
-               {
-                  png_push_have_row(png_ptr, NULL);
-                  png_read_push_finish_row(png_ptr);
-               }
-            }
-
-            break;
-         }
-
-         case 4:
-         {
-            int i;
-
-            for (i = 0; i < 2 && png_ptr->pass == 4; i++)
-            {
-               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr);
-            }
-
-            for (i = 0; i < 2 && png_ptr->pass == 4; i++)
-            {
-               png_push_have_row(png_ptr, NULL);
-               png_read_push_finish_row(png_ptr);
-            }
-
-            if (png_ptr->pass == 6) /* Pass 5 might be empty */
-            {
-               png_push_have_row(png_ptr, NULL);
-               png_read_push_finish_row(png_ptr);
-            }
-
-            break;
-         }
-
-         case 5:
-         {
-            int i;
-
-            for (i = 0; i < 2 && png_ptr->pass == 5; i++)
-            {
-               png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr);
-            }
-
-            if (png_ptr->pass == 6) /* Skip top generated row */
-            {
-               png_push_have_row(png_ptr, NULL);
-               png_read_push_finish_row(png_ptr);
-            }
-
-            break;
-         }
-
-         default:
-         case 6:
-         {
-            png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-            png_read_push_finish_row(png_ptr);
-
-            if (png_ptr->pass != 6)
-               break;
-
-            png_push_have_row(png_ptr, NULL);
-            png_read_push_finish_row(png_ptr);
-         }
-      }
-   }
-   else
-#endif
-   {
-      png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-      png_read_push_finish_row(png_ptr);
-   }
-}
-
-void /* PRIVATE */
-png_read_push_finish_row(png_structrp png_ptr)
-{
-#ifdef PNG_READ_INTERLACING_SUPPORTED
-   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
-
-   /* Start of interlace block */
-   static PNG_CONST png_byte png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
-
-   /* Offset to next interlace block */
-   static PNG_CONST png_byte png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
-
-   /* Start of interlace block in the y direction */
-   static PNG_CONST png_byte png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
-
-   /* Offset to next interlace block in the y direction */
-   static PNG_CONST png_byte png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
-
-   /* Height of interlace block.  This is not currently used - if you need
-    * it, uncomment it here and in png.h
-   static PNG_CONST png_byte png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
-   */
-#endif
-
-   png_ptr->row_number++;
-   if (png_ptr->row_number < png_ptr->num_rows)
-      return;
-
-#ifdef PNG_READ_INTERLACING_SUPPORTED
-   if (png_ptr->interlaced != 0)
-   {
-      png_ptr->row_number = 0;
-      memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
-
-      do
-      {
-         png_ptr->pass++;
-         if ((png_ptr->pass == 1 && png_ptr->width < 5) ||
-             (png_ptr->pass == 3 && png_ptr->width < 3) ||
-             (png_ptr->pass == 5 && png_ptr->width < 2))
-            png_ptr->pass++;
-
-         if (png_ptr->pass > 7)
-            png_ptr->pass--;
-
-         if (png_ptr->pass >= 7)
-            break;
-
-         png_ptr->iwidth = (png_ptr->width +
-             png_pass_inc[png_ptr->pass] - 1 -
-             png_pass_start[png_ptr->pass]) /
-             png_pass_inc[png_ptr->pass];
-
-         if ((png_ptr->transformations & PNG_INTERLACE) != 0)
-            break;
-
-         png_ptr->num_rows = (png_ptr->height +
-             png_pass_yinc[png_ptr->pass] - 1 -
-             png_pass_ystart[png_ptr->pass]) /
-             png_pass_yinc[png_ptr->pass];
-
-      } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
-   }
-#endif /* READ_INTERLACING */
-}
-
-void /* PRIVATE */
-png_push_have_info(png_structrp png_ptr, png_inforp info_ptr)
-{
-   if (png_ptr->info_fn != NULL)
-      (*(png_ptr->info_fn))(png_ptr, info_ptr);
-}
-
-void /* PRIVATE */
-png_push_have_end(png_structrp png_ptr, png_inforp info_ptr)
-{
-   if (png_ptr->end_fn != NULL)
-      (*(png_ptr->end_fn))(png_ptr, info_ptr);
-}
-
-void /* PRIVATE */
-png_push_have_row(png_structrp png_ptr, png_bytep row)
-{
-   if (png_ptr->row_fn != NULL)
-      (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number,
-          (int)png_ptr->pass);
-}
-
-#ifdef PNG_READ_INTERLACING_SUPPORTED
-void PNGAPI
-png_progressive_combine_row(png_const_structrp png_ptr, png_bytep old_row,
-    png_const_bytep new_row)
-{
-   if (png_ptr == NULL)
-      return;
-
-   /* new_row is a flag here - if it is NULL then the app callback was called
-    * from an empty row (see the calls to png_struct::row_fn below), otherwise
-    * it must be png_ptr->row_buf+1
-    */
-   if (new_row != NULL)
-      png_combine_row(png_ptr, old_row, 1/*blocky display*/);
-}
-#endif /* READ_INTERLACING */
-
-void PNGAPI
-png_set_progressive_read_fn(png_structrp png_ptr, png_voidp progressive_ptr,
-    png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
-    png_progressive_end_ptr end_fn)
-{
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->info_fn = info_fn;
-   png_ptr->row_fn = row_fn;
-   png_ptr->end_fn = end_fn;
-
-   png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
-}
-
-png_voidp PNGAPI
-png_get_progressive_ptr(png_const_structrp png_ptr)
-{
-   if (png_ptr == NULL)
-      return (NULL);
-
-   return png_ptr->io_ptr;
-}
-#endif /* PROGRESSIVE_READ */
diff --git a/src/png/libpng/pngpriv.h b/src/png/libpng/pngpriv.h
deleted file mode 100644
index 1f2e90f2b..000000000
--- a/src/png/libpng/pngpriv.h
+++ /dev/null
@@ -1,2120 +0,0 @@
-
-/* pngpriv.h - private declarations for use inside libpng
- *
- * Last changed in libpng 1.6.32 [August 24, 2017]
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-/* The symbols declared in this file (including the functions declared
- * as extern) are PRIVATE.  They are not part of the libpng public
- * interface, and are not recommended for use by regular applications.
- * Some of them may become public in the future; others may stay private,
- * change in an incompatible way, or even disappear.
- * Although the libpng users are not forbidden to include this header,
- * they should be well aware of the issues that may arise from doing so.
- */
-
-#ifndef PNGPRIV_H
-#define PNGPRIV_H
-
-/* Feature Test Macros.  The following are defined here to ensure that correctly
- * implemented libraries reveal the APIs libpng needs to build and hide those
- * that are not needed and potentially damaging to the compilation.
- *
- * Feature Test Macros must be defined before any system header is included (see
- * POSIX 1003.1 2.8.2 "POSIX Symbols."
- *
- * These macros only have an effect if the operating system supports either
- * POSIX 1003.1 or C99, or both.  On other operating systems (particularly
- * Windows/Visual Studio) there is no effect; the OS specific tests below are
- * still required (as of 2011-05-02.)
- */
-#ifndef _POSIX_SOURCE
-# define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
-#endif
-
-#ifndef PNG_VERSION_INFO_ONLY
-/* Standard library headers not required by png.h: */
-#  include <stdlib.h>
-#  include <string.h>
-#endif
-
-#define PNGLIB_BUILD /*libpng is being built, not used*/
-
-/* If HAVE_CONFIG_H is defined during the build then the build system must
- * provide an appropriate "config.h" file on the include path.  The header file
- * must provide definitions as required below (search for "HAVE_CONFIG_H");
- * see configure.ac for more details of the requirements.  The macro
- * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on
- * 'configure'; define this macro to prevent the configure build including the
- * configure generated config.h.  Libpng is expected to compile without *any*
- * special build system support on a reasonably ANSI-C compliant system.
- */
-#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
-#  include <config.h>
-
-   /* Pick up the definition of 'restrict' from config.h if it was read: */
-#  define PNG_RESTRICT restrict
-#endif
-
-/* To support symbol prefixing it is necessary to know *before* including png.h
- * whether the fixed point (and maybe other) APIs are exported, because if they
- * are not internal definitions may be required.  This is handled below just
- * before png.h is included, but load the configuration now if it is available.
- */
-#ifndef PNGLCONF_H
-#  include "pnglibconf.h"
-#endif
-
-/* Local renames may change non-exported API functions from png.h */
-#if defined(PNG_PREFIX) && !defined(PNGPREFIX_H)
-#  include "pngprefix.h"
-#endif
-
-#ifdef PNG_USER_CONFIG
-#  include "pngusr.h"
-   /* These should have been defined in pngusr.h */
-#  ifndef PNG_USER_PRIVATEBUILD
-#    define PNG_USER_PRIVATEBUILD "Custom libpng build"
-#  endif
-#  ifndef PNG_USER_DLLFNAME_POSTFIX
-#    define PNG_USER_DLLFNAME_POSTFIX "Cb"
-#  endif
-#endif
-
-/* Compile time options.
- * =====================
- * In a multi-arch build the compiler may compile the code several times for the
- * same object module, producing different binaries for different architectures.
- * When this happens configure-time setting of the target host options cannot be
- * done and this interferes with the handling of the ARM NEON optimizations, and
- * possibly other similar optimizations.  Put additional tests here; in general
- * this is needed when the same option can be changed at both compile time and
- * run time depending on the target OS (i.e. iOS vs Android.)
- *
- * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because
- * this is not possible with certain compilers (Oracle SUN OS CC), as a result
- * it is necessary to ensure that all extern functions that *might* be used
- * regardless of $(CFLAGS) get declared in this file.  The test on __ARM_NEON__
- * below is one example of this behavior because it is controlled by the
- * presence or not of -mfpu=neon on the GCC command line, it is possible to do
- * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely
- * do this.
- */
-#ifndef PNG_ARM_NEON_OPT
-   /* ARM NEON optimizations are being controlled by the compiler settings,
-    * typically the target FPU.  If the FPU has been set to NEON (-mfpu=neon
-    * with GCC) then the compiler will define __ARM_NEON__ and we can rely
-    * unconditionally on NEON instructions not crashing, otherwise we must
-    * disable use of NEON instructions.
-    *
-    * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they
-    * can only be turned on automatically if that is supported too.  If
-    * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail
-    * to compile with an appropriate #error if ALIGNED_MEMORY has been turned
-    * off.
-    *
-    * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated
-    * __ARM_NEON__, so we check both variants.
-    *
-    * To disable ARM_NEON optimizations entirely, and skip compiling the
-    * associated assembler code, pass --enable-arm-neon=no to configure
-    * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS.
-    */
-#  if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \
-   defined(PNG_ALIGNED_MEMORY_SUPPORTED)
-#     define PNG_ARM_NEON_OPT 2
-#  else
-#     define PNG_ARM_NEON_OPT 0
-#  endif
-#endif
-
-#if PNG_ARM_NEON_OPT > 0
-   /* NEON optimizations are to be at least considered by libpng, so enable the
-    * callbacks to do this.
-    */
-#  define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon
-
-   /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used
-    * if possible - if __ARM_NEON__ is set and the compiler version is not known
-    * to be broken.  This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can
-    * be:
-    *
-    *    1  The intrinsics code (the default with __ARM_NEON__)
-    *    2  The hand coded assembler (the default without __ARM_NEON__)
-    *
-    * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however
-    * this is *NOT* supported and may cease to work even after a minor revision
-    * to libpng.  It *is* valid to do this for testing purposes, e.g. speed
-    * testing or a new compiler, but the results should be communicated to the
-    * libpng implementation list for incorporation in the next minor release.
-    */
-#  ifndef PNG_ARM_NEON_IMPLEMENTATION
-#     if defined(__ARM_NEON__) || defined(__ARM_NEON)
-#        if defined(__clang__)
-            /* At present it is unknown by the libpng developers which versions
-             * of clang support the intrinsics, however some or perhaps all
-             * versions do not work with the assembler so this may be
-             * irrelevant, so just use the default (do nothing here.)
-             */
-#        elif defined(__GNUC__)
-            /* GCC 4.5.4 NEON support is known to be broken.  4.6.3 is known to
-             * work, so if this *is* GCC, or G++, look for a version >4.5
-             */
-#           if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
-#              define PNG_ARM_NEON_IMPLEMENTATION 2
-#           endif /* no GNUC support */
-#        endif /* __GNUC__ */
-#     else /* !defined __ARM_NEON__ */
-         /* The 'intrinsics' code simply won't compile without this -mfpu=neon:
-          */
-#        define PNG_ARM_NEON_IMPLEMENTATION 2
-#     endif /* __ARM_NEON__ */
-#  endif /* !PNG_ARM_NEON_IMPLEMENTATION */
-
-#  ifndef PNG_ARM_NEON_IMPLEMENTATION
-      /* Use the intrinsics code by default. */
-#     define PNG_ARM_NEON_IMPLEMENTATION 1
-#  endif
-#endif /* PNG_ARM_NEON_OPT > 0 */
-
-#ifndef PNG_MIPS_MSA_OPT
-#  if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED)
-#     define PNG_MIPS_MSA_OPT 2
-#  else
-#     define PNG_MIPS_MSA_OPT 0
-#  endif
-#endif
-
-#ifndef PNG_POWERPC_VSX_OPT
-#  if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__)
-#     define PNG_POWERPC_VSX_OPT 2
-#  else
-#     define PNG_POWERPC_VSX_OPT 0
-#  endif
-#endif
-
-#ifndef PNG_INTEL_SSE_OPT
-#   ifdef PNG_INTEL_SSE
-      /* Only check for SSE if the build configuration has been modified to
-       * enable SSE optimizations.  This means that these optimizations will
-       * be off by default.  See contrib/intel for more details.
-       */
-#     if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \
-       defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
-       (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
-#         define PNG_INTEL_SSE_OPT 1
-#      endif
-#   endif
-#endif
-
-#if PNG_INTEL_SSE_OPT > 0
-#   ifndef PNG_INTEL_SSE_IMPLEMENTATION
-#      if defined(__SSE4_1__) || defined(__AVX__)
-          /* We are not actually using AVX, but checking for AVX is the best
-             way we can detect SSE4.1 and SSSE3 on MSVC.
-          */
-#         define PNG_INTEL_SSE_IMPLEMENTATION 3
-#      elif defined(__SSSE3__)
-#         define PNG_INTEL_SSE_IMPLEMENTATION 2
-#      elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
-       (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
-#         define PNG_INTEL_SSE_IMPLEMENTATION 1
-#      else
-#         define PNG_INTEL_SSE_IMPLEMENTATION 0
-#      endif
-#   endif
-
-#   if PNG_INTEL_SSE_IMPLEMENTATION > 0
-#      define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2
-#   endif
-#endif
-
-#if PNG_MIPS_MSA_OPT > 0
-#  define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa
-#  ifndef PNG_MIPS_MSA_IMPLEMENTATION
-#     if defined(__mips_msa)
-#        if defined(__clang__)
-#        elif defined(__GNUC__)
-#           if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
-#              define PNG_MIPS_MSA_IMPLEMENTATION 2
-#           endif /* no GNUC support */
-#        endif /* __GNUC__ */
-#     else /* !defined __mips_msa */
-#        define PNG_MIPS_MSA_IMPLEMENTATION 2
-#     endif /* __mips_msa */
-#  endif /* !PNG_MIPS_MSA_IMPLEMENTATION */
-
-#  ifndef PNG_MIPS_MSA_IMPLEMENTATION
-#     define PNG_MIPS_MSA_IMPLEMENTATION 1
-#  endif
-#endif /* PNG_MIPS_MSA_OPT > 0 */
-
-#if PNG_POWERPC_VSX_OPT > 0
-#  define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx
-#  define PNG_POWERPC_VSX_IMPLEMENTATION 1
-#endif
-
-
-/* Is this a build of a DLL where compilation of the object modules requires
- * different preprocessor settings to those required for a simple library?  If
- * so PNG_BUILD_DLL must be set.
- *
- * If libpng is used inside a DLL but that DLL does not export the libpng APIs
- * PNG_BUILD_DLL must not be set.  To avoid the code below kicking in build a
- * static library of libpng then link the DLL against that.
- */
-#ifndef PNG_BUILD_DLL
-#  ifdef DLL_EXPORT
-      /* This is set by libtool when files are compiled for a DLL; libtool
-       * always compiles twice, even on systems where it isn't necessary.  Set
-       * PNG_BUILD_DLL in case it is necessary:
-       */
-#     define PNG_BUILD_DLL
-#  else
-#     ifdef _WINDLL
-         /* This is set by the Microsoft Visual Studio IDE in projects that
-          * build a DLL.  It can't easily be removed from those projects (it
-          * isn't visible in the Visual Studio UI) so it is a fairly reliable
-          * indication that PNG_IMPEXP needs to be set to the DLL export
-          * attributes.
-          */
-#        define PNG_BUILD_DLL
-#     else
-#        ifdef __DLL__
-            /* This is set by the Borland C system when compiling for a DLL
-             * (as above.)
-             */
-#           define PNG_BUILD_DLL
-#        else
-            /* Add additional compiler cases here. */
-#        endif
-#     endif
-#  endif
-#endif /* Setting PNG_BUILD_DLL if required */
-
-/* See pngconf.h for more details: the builder of the library may set this on
- * the command line to the right thing for the specific compilation system or it
- * may be automagically set above (at present we know of no system where it does
- * need to be set on the command line.)
- *
- * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
- * setting it to the "import" setting for a DLL build.
- */
-#ifndef PNG_IMPEXP
-#  ifdef PNG_BUILD_DLL
-#     define PNG_IMPEXP PNG_DLL_EXPORT
-#  else
-      /* Not building a DLL, or the DLL doesn't require specific export
-       * definitions.
-       */
-#     define PNG_IMPEXP
-#  endif
-#endif
-
-/* No warnings for private or deprecated functions in the build: */
-#ifndef PNG_DEPRECATED
-#  define PNG_DEPRECATED
-#endif
-#ifndef PNG_PRIVATE
-#  define PNG_PRIVATE
-#endif
-
-/* Symbol preprocessing support.
- *
- * To enable listing global, but internal, symbols the following macros should
- * always be used to declare an extern data or function object in this file.
- */
-#ifndef PNG_INTERNAL_DATA
-#  define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array
-#endif
-
-#ifndef PNG_INTERNAL_FUNCTION
-#  define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
-      PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
-#endif
-
-#ifndef PNG_INTERNAL_CALLBACK
-#  define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
-      PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\
-         PNG_EMPTY attributes)
-#endif
-
-/* If floating or fixed point APIs are disabled they may still be compiled
- * internally.  To handle this make sure they are declared as the appropriate
- * internal extern function (otherwise the symbol prefixing stuff won't work and
- * the functions will be used without definitions.)
- *
- * NOTE: although all the API functions are declared here they are not all
- * actually built!  Because the declarations are still made it is necessary to
- * fake out types that they depend on.
- */
-#ifndef PNG_FP_EXPORT
-#  ifndef PNG_FLOATING_POINT_SUPPORTED
-#     define PNG_FP_EXPORT(ordinal, type, name, args)\
-         PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
-#     ifndef PNG_VERSION_INFO_ONLY
-         typedef struct png_incomplete png_double;
-         typedef png_double*           png_doublep;
-         typedef const png_double*     png_const_doublep;
-         typedef png_double**          png_doublepp;
-#     endif
-#  endif
-#endif
-#ifndef PNG_FIXED_EXPORT
-#  ifndef PNG_FIXED_POINT_SUPPORTED
-#     define PNG_FIXED_EXPORT(ordinal, type, name, args)\
-         PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
-#  endif
-#endif
-
-#include "png.h"
-
-/* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
-#ifndef PNG_DLL_EXPORT
-#  define PNG_DLL_EXPORT
-#endif
-
-/* This is a global switch to set the compilation for an installed system
- * (a release build).  It can be set for testing debug builds to ensure that
- * they will compile when the build type is switched to RC or STABLE, the
- * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE.  Set this in CPPFLAGS
- * with either:
- *
- *   -DPNG_RELEASE_BUILD Turns on the release compile path
- *   -DPNG_RELEASE_BUILD=0 Turns it off
- * or in your pngusr.h with
- *   #define PNG_RELEASE_BUILD=1 Turns on the release compile path
- *   #define PNG_RELEASE_BUILD=0 Turns it off
- */
-#ifndef PNG_RELEASE_BUILD
-#  define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)
-#endif
-
-/* SECURITY and SAFETY:
- *
- * libpng is built with support for internal limits on image dimensions and
- * memory usage.  These are documented in scripts/pnglibconf.dfa of the
- * source and recorded in the machine generated header file pnglibconf.h.
- */
-
-/* If you are running on a machine where you cannot allocate more
- * than 64K of memory at once, uncomment this.  While libpng will not
- * normally need that much memory in a chunk (unless you load up a very
- * large file), zlib needs to know how big of a chunk it can use, and
- * libpng thus makes sure to check any memory allocation to verify it
- * will fit into memory.
- *
- * zlib provides 'MAXSEG_64K' which, if defined, indicates the
- * same limit and pngconf.h (already included) sets the limit
- * if certain operating systems are detected.
- */
-#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
-#  define PNG_MAX_MALLOC_64K
-#endif
-
-#ifndef PNG_UNUSED
-/* Unused formal parameter warnings are silenced using the following macro
- * which is expected to have no bad effects on performance (optimizing
- * compilers will probably remove it entirely).  Note that if you replace
- * it with something other than whitespace, you must include the terminating
- * semicolon.
- */
-#  define PNG_UNUSED(param) (void)param;
-#endif
-
-/* Just a little check that someone hasn't tried to define something
- * contradictory.
- */
-#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
-#  undef PNG_ZBUF_SIZE
-#  define PNG_ZBUF_SIZE 65536L
-#endif
-
-/* If warnings or errors are turned off the code is disabled or redirected here.
- * From 1.5.4 functions have been added to allow very limited formatting of
- * error and warning messages - this code will also be disabled here.
- */
-#ifdef PNG_WARNINGS_SUPPORTED
-#  define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
-#else
-#  define png_warning_parameter(p,number,string) ((void)0)
-#  define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
-#  define png_warning_parameter_signed(p,number,format,value) ((void)0)
-#  define png_formatted_warning(pp,p,message) ((void)(pp))
-#  define PNG_WARNING_PARAMETERS(p)
-#endif
-#ifndef PNG_ERROR_TEXT_SUPPORTED
-#  define png_fixed_error(s1,s2) png_err(s1)
-#endif
-
-/* Some fixed point APIs are still required even if not exported because
- * they get used by the corresponding floating point APIs.  This magic
- * deals with this:
- */
-#ifdef PNG_FIXED_POINT_SUPPORTED
-#  define PNGFAPI PNGAPI
-#else
-#  define PNGFAPI /* PRIVATE */
-#endif
-
-#ifndef PNG_VERSION_INFO_ONLY
-/* Other defines specific to compilers can go here.  Try to keep
- * them inside an appropriate ifdef/endif pair for portability.
- */
-
-/* C allows up-casts from (void*) to any pointer and (const void*) to any
- * pointer to a const object.  C++ regards this as a type error and requires an
- * explicit, static, cast and provides the static_cast<> rune to ensure that
- * const is not cast away.
- */
-#ifdef __cplusplus
-#  define png_voidcast(type, value) static_cast<type>(value)
-#  define png_constcast(type, value) const_cast<type>(value)
-#  define png_aligncast(type, value) \
-   static_cast<type>(static_cast<void*>(value))
-#  define png_aligncastconst(type, value) \
-   static_cast<type>(static_cast<const void*>(value))
-#else
-#  define png_voidcast(type, value) (value)
-#  ifdef _WIN64
-#     ifdef __GNUC__
-         typedef unsigned long long png_ptruint;
-#     else
-         typedef unsigned __int64 png_ptruint;
-#     endif
-#  else
-      typedef unsigned long png_ptruint;
-#  endif
-#  define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value))
-#  define png_aligncast(type, value) ((void*)(value))
-#  define png_aligncastconst(type, value) ((const void*)(value))
-#endif /* __cplusplus */
-
-#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
-    defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
-   /* png.c requires the following ANSI-C constants if the conversion of
-    * floating point to ASCII is implemented therein:
-    *
-    *  DBL_DIG  Maximum number of decimal digits (can be set to any constant)
-    *  DBL_MIN  Smallest normalized fp number (can be set to an arbitrary value)
-    *  DBL_MAX  Maximum floating point number (can be set to an arbitrary value)
-    */
-#  include <float.h>
-
-#  if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
-    defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
-   /* We need to check that <math.h> hasn't already been included earlier
-    * as it seems it doesn't agree with <fp.h>, yet we should really use
-    * <fp.h> if possible.
-    */
-#    if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
-#      include <fp.h>
-#    endif
-#  else
-#    include <math.h>
-#  endif
-#  if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
-   /* Amiga SAS/C: We must include builtin FPU functions when compiling using
-    * MATH=68881
-    */
-#    include <m68881.h>
-#  endif
-#endif
-
-/* This provides the non-ANSI (far) memory allocation routines. */
-#if defined(__TURBOC__) && defined(__MSDOS__)
-#  include <mem.h>
-#  include <alloc.h>
-#endif
-
-#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
-    defined(_WIN32) || defined(__WIN32__)
-#  include <windows.h>  /* defines _WINDOWS_ macro */
-#endif
-#endif /* PNG_VERSION_INFO_ONLY */
-
-/* Moved here around 1.5.0beta36 from pngconf.h */
-/* Users may want to use these so they are not private.  Any library
- * functions that are passed far data must be model-independent.
- */
-
-/* Memory model/platform independent fns */
-#ifndef PNG_ABORT
-#  ifdef _WINDOWS_
-#    define PNG_ABORT() ExitProcess(0)
-#  else
-#    define PNG_ABORT() abort()
-#  endif
-#endif
-
-/* These macros may need to be architecture dependent. */
-#define PNG_ALIGN_NONE   0 /* do not use data alignment */
-#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
-#ifdef offsetof
-#  define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
-#else
-#  define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
-#endif
-#define PNG_ALIGN_SIZE   3 /* use sizeof to determine alignment */
-
-#ifndef PNG_ALIGN_TYPE
-   /* Default to using aligned access optimizations and requiring alignment to a
-    * multiple of the data type size.  Override in a compiler specific fashion
-    * if necessary by inserting tests here:
-    */
-#  define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
-#endif
-
-#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
-   /* This is used because in some compiler implementations non-aligned
-    * structure members are supported, so the offsetof approach below fails.
-    * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
-    * is good for performance.  Do not do this unless you have tested the result
-    * and understand it.
-    */
-#  define png_alignof(type) (sizeof (type))
-#else
-#  if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
-#     define png_alignof(type) offsetof(struct{char c; type t;}, t)
-#  else
-#     if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
-#        define png_alignof(type) (1)
-#     endif
-      /* Else leave png_alignof undefined to prevent use thereof */
-#  endif
-#endif
-
-/* This implicitly assumes alignment is always to a power of 2. */
-#ifdef png_alignof
-#  define png_isaligned(ptr, type)\
-   (((type)((const char*)ptr-(const char*)0) & \
-   (type)(png_alignof(type)-1)) == 0)
-#else
-#  define png_isaligned(ptr, type) 0
-#endif
-
-/* End of memory model/platform independent support */
-/* End of 1.5.0beta36 move from pngconf.h */
-
-/* CONSTANTS and UTILITY MACROS
- * These are used internally by libpng and not exposed in the API
- */
-
-/* Various modes of operation.  Note that after an init, mode is set to
- * zero automatically when the structure is created.  Three of these
- * are defined in png.h because they need to be visible to applications
- * that call png_set_unknown_chunk().
- */
-/* #define PNG_HAVE_IHDR            0x01U (defined in png.h) */
-/* #define PNG_HAVE_PLTE            0x02U (defined in png.h) */
-#define PNG_HAVE_IDAT               0x04U
-/* #define PNG_AFTER_IDAT           0x08U (defined in png.h) */
-#define PNG_HAVE_IEND               0x10U
-                   /*               0x20U (unused) */
-                   /*               0x40U (unused) */
-                   /*               0x80U (unused) */
-#define PNG_HAVE_CHUNK_HEADER      0x100U
-#define PNG_WROTE_tIME             0x200U
-#define PNG_WROTE_INFO_BEFORE_PLTE 0x400U
-#define PNG_BACKGROUND_IS_GRAY     0x800U
-#define PNG_HAVE_PNG_SIGNATURE    0x1000U
-#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */
-                   /*             0x4000U (unused) */
-#define PNG_IS_READ_STRUCT        0x8000U /* Else is a write struct */
-
-/* Flags for the transformations the PNG library does on the image data */
-#define PNG_BGR                 0x0001U
-#define PNG_INTERLACE           0x0002U
-#define PNG_PACK                0x0004U
-#define PNG_SHIFT               0x0008U
-#define PNG_SWAP_BYTES          0x0010U
-#define PNG_INVERT_MONO         0x0020U
-#define PNG_QUANTIZE            0x0040U
-#define PNG_COMPOSE             0x0080U    /* Was PNG_BACKGROUND */
-#define PNG_BACKGROUND_EXPAND   0x0100U
-#define PNG_EXPAND_16           0x0200U    /* Added to libpng 1.5.2 */
-#define PNG_16_TO_8             0x0400U    /* Becomes 'chop' in 1.5.4 */
-#define PNG_RGBA                0x0800U
-#define PNG_EXPAND              0x1000U
-#define PNG_GAMMA               0x2000U
-#define PNG_GRAY_TO_RGB         0x4000U
-#define PNG_FILLER              0x8000U
-#define PNG_PACKSWAP           0x10000U
-#define PNG_SWAP_ALPHA         0x20000U
-#define PNG_STRIP_ALPHA        0x40000U
-#define PNG_INVERT_ALPHA       0x80000U
-#define PNG_USER_TRANSFORM    0x100000U
-#define PNG_RGB_TO_GRAY_ERR   0x200000U
-#define PNG_RGB_TO_GRAY_WARN  0x400000U
-#define PNG_RGB_TO_GRAY       0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */
-#define PNG_ENCODE_ALPHA      0x800000U /* Added to libpng-1.5.4 */
-#define PNG_ADD_ALPHA        0x1000000U /* Added to libpng-1.2.7 */
-#define PNG_EXPAND_tRNS      0x2000000U /* Added to libpng-1.2.9 */
-#define PNG_SCALE_16_TO_8    0x4000000U /* Added to libpng-1.5.4 */
-                       /*    0x8000000U unused */
-                       /*   0x10000000U unused */
-                       /*   0x20000000U unused */
-                       /*   0x40000000U unused */
-/* Flags for png_create_struct */
-#define PNG_STRUCT_PNG   0x0001U
-#define PNG_STRUCT_INFO  0x0002U
-
-/* Flags for the png_ptr->flags rather than declaring a byte for each one */
-#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001U
-#define PNG_FLAG_ZSTREAM_INITIALIZED      0x0002U /* Added to libpng-1.6.0 */
-                                  /*      0x0004U    unused */
-#define PNG_FLAG_ZSTREAM_ENDED            0x0008U /* Added to libpng-1.6.0 */
-                                  /*      0x0010U    unused */
-                                  /*      0x0020U    unused */
-#define PNG_FLAG_ROW_INIT                 0x0040U
-#define PNG_FLAG_FILLER_AFTER             0x0080U
-#define PNG_FLAG_CRC_ANCILLARY_USE        0x0100U
-#define PNG_FLAG_CRC_ANCILLARY_NOWARN     0x0200U
-#define PNG_FLAG_CRC_CRITICAL_USE         0x0400U
-#define PNG_FLAG_CRC_CRITICAL_IGNORE      0x0800U
-#define PNG_FLAG_ASSUME_sRGB              0x1000U /* Added to libpng-1.5.4 */
-#define PNG_FLAG_OPTIMIZE_ALPHA           0x2000U /* Added to libpng-1.5.4 */
-#define PNG_FLAG_DETECT_UNINITIALIZED     0x4000U /* Added to libpng-1.5.4 */
-/* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS      0x8000U */
-/* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS      0x10000U */
-#define PNG_FLAG_LIBRARY_MISMATCH        0x20000U
-#define PNG_FLAG_STRIP_ERROR_NUMBERS     0x40000U
-#define PNG_FLAG_STRIP_ERROR_TEXT        0x80000U
-#define PNG_FLAG_BENIGN_ERRORS_WARN     0x100000U /* Added to libpng-1.4.0 */
-#define PNG_FLAG_APP_WARNINGS_WARN      0x200000U /* Added to libpng-1.6.0 */
-#define PNG_FLAG_APP_ERRORS_WARN        0x400000U /* Added to libpng-1.6.0 */
-                                  /*    0x800000U    unused */
-                                  /*   0x1000000U    unused */
-                                  /*   0x2000000U    unused */
-                                  /*   0x4000000U    unused */
-                                  /*   0x8000000U    unused */
-                                  /*  0x10000000U    unused */
-                                  /*  0x20000000U    unused */
-                                  /*  0x40000000U    unused */
-
-#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
-                                     PNG_FLAG_CRC_ANCILLARY_NOWARN)
-
-#define PNG_FLAG_CRC_CRITICAL_MASK  (PNG_FLAG_CRC_CRITICAL_USE | \
-                                     PNG_FLAG_CRC_CRITICAL_IGNORE)
-
-#define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \
-                                     PNG_FLAG_CRC_CRITICAL_MASK)
-
-/* Save typing and make code easier to understand */
-
-#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
-   abs((int)((c1).green) - (int)((c2).green)) + \
-   abs((int)((c1).blue) - (int)((c2).blue)))
-
-/* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
- * by dividing by 257 *with rounding*.  This macro is exact for the given range.
- * See the discourse in pngrtran.c png_do_scale_16_to_8.  The values in the
- * macro were established by experiment (modifying the added value).  The macro
- * has a second variant that takes a value already scaled by 255 and divides by
- * 65535 - this has a maximum error of .502.  Over the range 0..65535*65535 it
- * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
- */
-#define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
-#define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
-
-/* Added to libpng-1.2.6 JB */
-#define PNG_ROWBYTES(pixel_bits, width) \
-    ((pixel_bits) >= 8 ? \
-    ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
-    (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
-
-/* This returns the number of trailing bits in the last byte of a row, 0 if the
- * last byte is completely full of pixels.  It is, in principle, (pixel_bits x
- * width) % 8, but that would overflow for large 'width'.  The second macro is
- * the same except that it returns the number of unused bits in the last byte;
- * (8-TRAILBITS), but 0 when TRAILBITS is 0.
- *
- * NOTE: these macros are intended to be self-evidently correct and never
- * overflow on the assumption that pixel_bits is in the range 0..255.  The
- * arguments are evaluated only once and they can be signed (e.g. as a result of
- * the integral promotions).  The result of the expression always has type
- * (png_uint_32), however the compiler always knows it is in the range 0..7.
- */
-#define PNG_TRAILBITS(pixel_bits, width) \
-    (((pixel_bits) * ((width) % (png_uint_32)8)) % 8)
-
-#define PNG_PADBITS(pixel_bits, width) \
-    ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8)
-
-/* PNG_OUT_OF_RANGE returns true if value is outside the range
- * ideal-delta..ideal+delta.  Each argument is evaluated twice.
- * "ideal" and "delta" should be constants, normally simple
- * integers, "value" a variable. Added to libpng-1.2.6 JB
- */
-#define PNG_OUT_OF_RANGE(value, ideal, delta) \
-   ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
-
-/* Conversions between fixed and floating point, only defined if
- * required (to make sure the code doesn't accidentally use float
- * when it is supposedly disabled.)
- */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-/* The floating point conversion can't overflow, though it can and
- * does lose accuracy relative to the original fixed point value.
- * In practice this doesn't matter because png_fixed_point only
- * stores numbers with very low precision.  The png_ptr and s
- * arguments are unused by default but are there in case error
- * checking becomes a requirement.
- */
-#define png_float(png_ptr, fixed, s) (.00001 * (fixed))
-
-/* The fixed point conversion performs range checking and evaluates
- * its argument multiple times, so must be used with care.  The
- * range checking uses the PNG specification values for a signed
- * 32-bit fixed point value except that the values are deliberately
- * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
- * (2^31-1) * 100000). 's' is a string that describes the value being
- * converted.
- *
- * NOTE: this macro will raise a png_error if the range check fails,
- * therefore it is normally only appropriate to use this on values
- * that come from API calls or other sources where an out of range
- * error indicates a programming error, not a data error!
- *
- * NOTE: by default this is off - the macro is not used - because the
- * function call saves a lot of code.
- */
-#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
-#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
-    ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
-#endif
-/* else the corresponding function is defined below, inside the scope of the
- * cplusplus test.
- */
-#endif
-
-/* Constants for known chunk types.  If you need to add a chunk, define the name
- * here.  For historical reasons these constants have the form png_<name>; i.e.
- * the prefix is lower case.  Please use decimal values as the parameters to
- * match the ISO PNG specification and to avoid relying on the C locale
- * interpretation of character values.
- *
- * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
- * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
- * to be generated if required.
- *
- * PNG_32b correctly produces a value shifted by up to 24 bits, even on
- * architectures where (int) is only 16 bits.
- */
-#define PNG_32b(b,s) ((png_uint_32)(b) << (s))
-#define PNG_U32(b1,b2,b3,b4) \
-   (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
-
-/* Constants for known chunk types.
- *
- * MAINTAINERS: If you need to add a chunk, define the name here.
- * For historical reasons these constants have the form png_<name>; i.e.
- * the prefix is lower case.  Please use decimal values as the parameters to
- * match the ISO PNG specification and to avoid relying on the C locale
- * interpretation of character values.  Please keep the list sorted.
- *
- * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
- * type.  In fact the specification does not express chunk types this way,
- * however using a 32-bit value means that the chunk type can be read from the
- * stream using exactly the same code as used for a 32-bit unsigned value and
- * can be examined far more efficiently (using one arithmetic compare).
- *
- * Prior to 1.5.6 the chunk type constants were expressed as C strings.  The
- * libpng API still uses strings for 'unknown' chunks and a macro,
- * PNG_STRING_FROM_CHUNK, allows a string to be generated if required.  Notice
- * that for portable code numeric values must still be used; the string "IHDR"
- * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
- *
- * In 1.7.0 the definitions will be made public in png.h to avoid having to
- * duplicate the same definitions in application code.
- */
-#define png_IDAT PNG_U32( 73,  68,  65,  84)
-#define png_IEND PNG_U32( 73,  69,  78,  68)
-#define png_IHDR PNG_U32( 73,  72,  68,  82)
-#define png_PLTE PNG_U32( 80,  76,  84,  69)
-#define png_bKGD PNG_U32( 98,  75,  71,  68)
-#define png_cHRM PNG_U32( 99,  72,  82,  77)
-#define png_eXIf PNG_U32(101,  88,  73, 102) /* registered July 2017 */
-#define png_fRAc PNG_U32(102,  82,  65,  99) /* registered, not defined */
-#define png_gAMA PNG_U32(103,  65,  77,  65)
-#define png_gIFg PNG_U32(103,  73,  70, 103)
-#define png_gIFt PNG_U32(103,  73,  70, 116) /* deprecated */
-#define png_gIFx PNG_U32(103,  73,  70, 120)
-#define png_hIST PNG_U32(104,  73,  83,  84)
-#define png_iCCP PNG_U32(105,  67,  67,  80)
-#define png_iTXt PNG_U32(105,  84,  88, 116)
-#define png_oFFs PNG_U32(111,  70,  70, 115)
-#define png_pCAL PNG_U32(112,  67,  65,  76)
-#define png_pHYs PNG_U32(112,  72,  89, 115)
-#define png_sBIT PNG_U32(115,  66,  73,  84)
-#define png_sCAL PNG_U32(115,  67,  65,  76)
-#define png_sPLT PNG_U32(115,  80,  76,  84)
-#define png_sRGB PNG_U32(115,  82,  71,  66)
-#define png_sTER PNG_U32(115,  84,  69,  82)
-#define png_tEXt PNG_U32(116,  69,  88, 116)
-#define png_tIME PNG_U32(116,  73,  77,  69)
-#define png_tRNS PNG_U32(116,  82,  78,  83)
-#define png_zTXt PNG_U32(122,  84,  88, 116)
-
-/* The following will work on (signed char*) strings, whereas the get_uint_32
- * macro will fail on top-bit-set values because of the sign extension.
- */
-#define PNG_CHUNK_FROM_STRING(s)\
-   PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3])
-
-/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
- * signed and the argument is a (char[])  This macro will fail miserably on
- * systems where (char) is more than 8 bits.
- */
-#define PNG_STRING_FROM_CHUNK(s,c)\
-   (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \
-   ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\
-   ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \
-   ((char*)(s))[3]=(char)((c & 0xff)))
-
-/* Do the same but terminate with a null character. */
-#define PNG_CSTRING_FROM_CHUNK(s,c)\
-   (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
-
-/* Test on flag values as defined in the spec (section 5.4): */
-#define PNG_CHUNK_ANCILLARY(c)   (1 & ((c) >> 29))
-#define PNG_CHUNK_CRITICAL(c)     (!PNG_CHUNK_ANCILLARY(c))
-#define PNG_CHUNK_PRIVATE(c)      (1 & ((c) >> 21))
-#define PNG_CHUNK_RESERVED(c)     (1 & ((c) >> 13))
-#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >>  5))
-
-/* Gamma values (new at libpng-1.5.4): */
-#define PNG_GAMMA_MAC_OLD 151724  /* Assume '1.8' is really 2.2/1.45! */
-#define PNG_GAMMA_MAC_INVERSE 65909
-#define PNG_GAMMA_sRGB_INVERSE 45455
-
-/* Almost everything below is C specific; the #defines above can be used in
- * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
- */
-#ifndef PNG_VERSION_INFO_ONLY
-
-#include "pngstruct.h"
-#include "pnginfo.h"
-
-/* Validate the include paths - the include path used to generate pnglibconf.h
- * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
- */
-#if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
-#  error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
-      "-I (include path) error: see the notes in pngpriv.h"
-   /* This means that when pnglibconf.h was built the copy of zlib.h that it
-    * used is not the same as the one being used here.  Because the build of
-    * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
-    * zlib version number and because this affects handling of certain broken
-    * PNG files the -I directives must match.
-    *
-    * The most likely explanation is that you passed a -I in CFLAGS. This will
-    * not work; all the preprocessor directories and in particular all the -I
-    * directives must be in CPPFLAGS.
-    */
-#endif
-
-/* This is used for 16-bit gamma tables -- only the top level pointers are
- * const; this could be changed:
- */
-typedef const png_uint_16p * png_const_uint_16pp;
-
-/* Added to libpng-1.5.7: sRGB conversion tables */
-#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
-   defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
-#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
-PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
-   /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
-    * 0..65535.  This table gives the closest 16-bit answers (no errors).
-    */
-#endif
-
-PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
-PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
-
-#define PNG_sRGB_FROM_LINEAR(linear) \
-  ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \
-   + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)))
-   /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
-    * encoded value with maximum error 0.646365.  Note that the input is not a
-    * 16-bit value; it has been multiplied by 255! */
-#endif /* SIMPLIFIED_READ/WRITE */
-
-
-/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-/* Internal functions; these are not exported from a DLL however because they
- * are used within several of the C source files they have to be C extern.
- *
- * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
- */
-
-/* Zlib support */
-#define PNG_UNEXPECTED_ZLIB_RETURN (-7)
-PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
-   PNG_EMPTY);
-   /* Used by the zlib handling functions to ensure that z_stream::msg is always
-    * set before they return.
-    */
-
-#ifdef PNG_WRITE_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
-   png_compression_bufferp *list),PNG_EMPTY);
-   /* Free the buffer list used by the compressed write code. */
-#endif
-
-#if defined(PNG_FLOATING_POINT_SUPPORTED) && \
-   !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
-   (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
-   defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
-   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
-   (defined(PNG_sCAL_SUPPORTED) && \
-   defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
-PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
-   double fp, png_const_charp text),PNG_EMPTY);
-#endif
-
-/* Check the user version string for compatibility, returns false if the version
- * numbers aren't compatible.
- */
-PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
-   png_const_charp user_png_ver),PNG_EMPTY);
-
-/* Internal base allocator - no messages, NULL on failure to allocate.  This
- * does, however, call the application provided allocator and that could call
- * png_error (although that would be a bug in the application implementation.)
- */
-PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
-   png_alloc_size_t size),PNG_ALLOCATED);
-
-#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
-   defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
-/* Internal array allocator, outputs no error or warning messages on failure,
- * just returns NULL.
- */
-PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
-   int nelements, size_t element_size),PNG_ALLOCATED);
-
-/* The same but an existing array is extended by add_elements.  This function
- * also memsets the new elements to 0 and copies the old elements.  The old
- * array is not freed or altered.
- */
-PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,
-   png_const_voidp array, int old_elements, int add_elements,
-   size_t element_size),PNG_ALLOCATED);
-#endif /* text, sPLT or unknown chunks */
-
-/* Magic to create a struct when there is no struct to call the user supplied
- * memory allocators.  Because error handling has not been set up the memory
- * handlers can't safely call png_error, but this is an obscure and undocumented
- * restriction so libpng has to assume that the 'free' handler, at least, might
- * call png_error.
- */
-PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
-   (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
-    png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
-    png_free_ptr free_fn),PNG_ALLOCATED);
-
-/* Free memory from internal libpng struct */
-PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
-   PNG_EMPTY);
-
-/* Free an allocated jmp_buf (always succeeds) */
-PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
-
-/* Function to allocate memory for zlib.  PNGAPI is disallowed. */
-PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
-   PNG_ALLOCATED);
-
-/* Function to free memory for zlib.  PNGAPI is disallowed. */
-PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
-
-/* Next four functions are used internally as callbacks.  PNGCBAPI is required
- * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3, changed to
- * PNGCBAPI at 1.5.0
- */
-
-PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
-    png_bytep data, png_size_t length),PNG_EMPTY);
-
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
-    png_bytep buffer, png_size_t length),PNG_EMPTY);
-#endif
-
-PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
-    png_bytep data, png_size_t length),PNG_EMPTY);
-
-#ifdef PNG_WRITE_FLUSH_SUPPORTED
-#  ifdef PNG_STDIO_SUPPORTED
-PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
-   PNG_EMPTY);
-#  endif
-#endif
-
-/* Reset the CRC variable */
-PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
-
-/* Write the "data" buffer to whatever output you are using */
-PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
-    png_const_bytep data, png_size_t length),PNG_EMPTY);
-
-/* Read and check the PNG file signature */
-PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
-   png_inforp info_ptr),PNG_EMPTY);
-
-/* Read the chunk header (length + type name) */
-PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
-   PNG_EMPTY);
-
-/* Read data from whatever input you are using into the "data" buffer */
-PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
-    png_size_t length),PNG_EMPTY);
-
-/* Read bytes into buf, and update png_ptr->crc */
-PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
-    png_uint_32 length),PNG_EMPTY);
-
-/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
-PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
-   png_uint_32 skip),PNG_EMPTY);
-
-/* Read the CRC from the file and compare it to the libpng calculated CRC */
-PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
-
-/* Calculate the CRC over a section of data.  Note that we are only
- * passing a maximum of 64K on systems that have this as a memory limit,
- * since this is the maximum buffer size we can specify.
- */
-PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
-   png_const_bytep ptr, png_size_t length),PNG_EMPTY);
-
-#ifdef PNG_WRITE_FLUSH_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
-#endif
-
-/* Write various chunks */
-
-/* Write the IHDR chunk, and update the png_struct with the necessary
- * information.
- */
-PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
-   png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
-   int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
-
-PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
-   png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
-
-PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
-   png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
-   PNG_EMPTY);
-
-PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
-
-#ifdef PNG_WRITE_gAMA_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
-    png_fixed_point file_gamma),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_sBIT_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
-    png_const_color_8p sbit, int color_type),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_cHRM_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
-    const png_xy *xy), PNG_EMPTY);
-   /* The xy value must have been previously validated */
-#endif
-
-#ifdef PNG_WRITE_sRGB_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
-    int intent),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_eXIf_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr,
-    png_bytep exif, int num_exif),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_iCCP_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
-   png_const_charp name, png_const_bytep profile), PNG_EMPTY);
-   /* The profile must have been previously validated for correctness, the
-    * length comes from the first four bytes.  Only the base, deflate,
-    * compression is supported.
-    */
-#endif
-
-#ifdef PNG_WRITE_sPLT_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
-    png_const_sPLT_tp palette),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_tRNS_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
-    png_const_bytep trans, png_const_color_16p values, int number,
-    int color_type),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_bKGD_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
-    png_const_color_16p values, int color_type),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_hIST_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
-    png_const_uint_16p hist, int num_hist),PNG_EMPTY);
-#endif
-
-/* Chunks that have keywords */
-#ifdef PNG_WRITE_tEXt_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
-   png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_zTXt_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp
-    key, png_const_charp text, int compression),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_iTXt_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
-    int compression, png_const_charp key, png_const_charp lang,
-    png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
-#endif
-
-#ifdef PNG_TEXT_SUPPORTED  /* Added at version 1.0.14 and 1.2.4 */
-PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
-    png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_oFFs_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
-    png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_pCAL_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
-    png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
-    png_const_charp units, png_charpp params),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_pHYs_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
-    png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
-    int unit_type),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_tIME_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
-    png_const_timep mod_time),PNG_EMPTY);
-#endif
-
-#ifdef PNG_WRITE_sCAL_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
-    int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
-#endif
-
-/* Called when finished processing a row of data */
-PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
-    PNG_EMPTY);
-
-/* Internal use only.   Called before first row of data */
-PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
-    PNG_EMPTY);
-
-/* Combine a row of data, dealing with alpha, etc. if requested.  'row' is an
- * array of png_ptr->width pixels.  If the image is not interlaced or this
- * is the final pass this just does a memcpy, otherwise the "display" flag
- * is used to determine whether to copy pixels that are not in the current pass.
- *
- * Because 'png_do_read_interlace' (below) replicates pixels this allows this
- * function to achieve the documented 'blocky' appearance during interlaced read
- * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
- * are not changed if they are not in the current pass, when display is 0.
- *
- * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
- *
- * The API always reads from the png_struct row buffer and always assumes that
- * it is full width (png_do_read_interlace has already been called.)
- *
- * This function is only ever used to write to row buffers provided by the
- * caller of the relevant libpng API and the row must have already been
- * transformed by the read transformations.
- *
- * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
- * bitmasks for use within the code, otherwise runtime generated masks are used.
- * The default is compile time masks.
- */
-#ifndef PNG_USE_COMPILE_TIME_MASKS
-#  define PNG_USE_COMPILE_TIME_MASKS 1
-#endif
-PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
-    png_bytep row, int display),PNG_EMPTY);
-
-#ifdef PNG_READ_INTERLACING_SUPPORTED
-/* Expand an interlaced row: the 'row_info' describes the pass data that has
- * been read in and must correspond to the pixels in 'row', the pixels are
- * expanded (moved apart) in 'row' to match the final layout, when doing this
- * the pixels are *replicated* to the intervening space.  This is essential for
- * the correct operation of png_combine_row, above.
- */
-PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
-    png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
-#endif
-
-/* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */
-
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED
-/* Grab pixels out of a row for an interlaced pass */
-PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
-    png_bytep row, int pass),PNG_EMPTY);
-#endif
-
-/* Unfilter a row: check the filter value before calling this, there is no point
- * calling it for PNG_FILTER_VALUE_NONE.
- */
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
-
-#if PNG_ARM_NEON_OPT > 0
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
-    png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-#endif
-
-#if PNG_MIPS_MSA_OPT > 0
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info,
-    png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-#endif
-
-#if PNG_POWERPC_VSX_OPT > 0
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info,
-    png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_vsx,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_vsx,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-#endif
-
-#if PNG_INTEL_SSE_IMPLEMENTATION > 0
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop
-    row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-#endif
-
-/* Choose the best filter to use and filter the row data */
-PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
-    png_row_infop row_info),PNG_EMPTY);
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
-   png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
-   /* Read 'avail_out' bytes of data from the IDAT stream.  If the output buffer
-    * is NULL the function checks, instead, for the end of the stream.  In this
-    * case a benign error will be issued if the stream end is not found or if
-    * extra data has to be consumed.
-    */
-PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
-   PNG_EMPTY);
-   /* This cleans up when the IDAT LZ stream does not end when the last image
-    * byte is read; there is still some pending input.
-    */
-
-PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
-   PNG_EMPTY);
-   /* Finish a row while reading, dealing with interlacing passes, etc. */
-#endif /* SEQUENTIAL_READ */
-
-/* Initialize the row buffers, etc. */
-PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
-
-#if ZLIB_VERNUM >= 0x1240
-PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush),
-      PNG_EMPTY);
-#  define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush)
-#else /* Zlib < 1.2.4 */
-#  define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush)
-#endif /* Zlib < 1.2.4 */
-
-#ifdef PNG_READ_TRANSFORMS_SUPPORTED
-/* Optional call to update the users info structure */
-PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
-    png_inforp info_ptr),PNG_EMPTY);
-#endif
-
-/* Shared transform functions, defined in pngtran.c */
-#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
-    defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
-    png_bytep row, int at_start),PNG_EMPTY);
-#endif
-
-#ifdef PNG_16BIT_SUPPORTED
-#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
-PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
-    png_bytep row),PNG_EMPTY);
-#endif
-#endif
-
-#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
-    defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
-    png_bytep row),PNG_EMPTY);
-#endif
-
-#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
-PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
-    png_bytep row),PNG_EMPTY);
-#endif
-
-#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
-    png_bytep row),PNG_EMPTY);
-#endif
-
-/* The following decodes the appropriate chunks, and does error correction,
- * then calls the appropriate callback for the chunk if it is valid.
- */
-
-/* Decode the IHDR chunk */
-PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-
-#ifdef PNG_READ_bKGD_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_cHRM_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_eXIf_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_gAMA_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_hIST_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_iCCP_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif /* READ_iCCP */
-
-#ifdef PNG_READ_iTXt_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_oFFs_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_pCAL_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_pHYs_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_sBIT_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_sCAL_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_sPLT_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif /* READ_sPLT */
-
-#ifdef PNG_READ_sRGB_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_tEXt_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_tIME_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_tRNS_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_zTXt_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-#endif
-
-PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr,
-    const png_uint_32 chunk_name),PNG_EMPTY);
-
-PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr,
-    const png_uint_32 chunk_length),PNG_EMPTY);
-
-PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
-   /* This is the function that gets called for unknown chunks.  The 'keep'
-    * argument is either non-zero for a known chunk that has been set to be
-    * handled as unknown or zero for an unknown chunk.  By default the function
-    * just skips the chunk or errors out if it is critical.
-    */
-
-#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
-    defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
-PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
-    (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
-   /* Exactly as the API png_handle_as_unknown() except that the argument is a
-    * 32-bit chunk name, not a string.
-    */
-#endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */
-
-/* Handle the transformations for reading and writing */
-#ifdef PNG_READ_TRANSFORMS_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
-   png_row_infop row_info),PNG_EMPTY);
-#endif
-#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
-   png_row_infop row_info),PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_TRANSFORMS_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
-    PNG_EMPTY);
-#endif
-
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
-    png_inforp info_ptr),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
-    png_inforp info_ptr),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
-    PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
-    png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
-    png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
-    PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
-   png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
-   png_inforp info_ptr),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
-   png_inforp info_ptr),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
-    png_bytep row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
-    png_inforp info_ptr),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
-    png_inforp info_ptr),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
-    PNG_EMPTY);
-#  ifdef PNG_READ_tEXt_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
-    png_inforp info_ptr),PNG_EMPTY);
-#  endif
-#  ifdef PNG_READ_zTXt_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
-    png_inforp info_ptr),PNG_EMPTY);
-#  endif
-#  ifdef PNG_READ_iTXt_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
-    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
-    png_inforp info_ptr),PNG_EMPTY);
-#  endif
-
-#endif /* PROGRESSIVE_READ */
-
-/* Added at libpng version 1.6.0 */
-#ifdef PNG_GAMMA_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
-    png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
-   /* Set the colorspace gamma with a value provided by the application or by
-    * the gAMA chunk on read.  The value will override anything set by an ICC
-    * profile.
-    */
-
-PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
-    png_inforp info_ptr), PNG_EMPTY);
-   /* Synchronize the info 'valid' flags with the colorspace */
-
-PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
-    png_inforp info_ptr), PNG_EMPTY);
-   /* Copy the png_struct colorspace to the info_struct and call the above to
-    * synchronize the flags.  Checks for NULL info_ptr and does nothing.
-    */
-#endif
-
-/* Added at libpng version 1.4.0 */
-#ifdef PNG_COLORSPACE_SUPPORTED
-/* These internal functions are for maintaining the colorspace structure within
- * a png_info or png_struct (or, indeed, both).
- */
-PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
-   (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
-    int preferred), PNG_EMPTY);
-
-PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
-   (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
-    int preferred), PNG_EMPTY);
-
-#ifdef PNG_sRGB_SUPPORTED
-PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
-   png_colorspacerp colorspace, int intent), PNG_EMPTY);
-   /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
-    * flags to write them, if it returns false there was a problem and an error
-    * message has already been output (but the colorspace may still need to be
-    * synced to record the invalid flag).
-    */
-#endif /* sRGB */
-
-#ifdef PNG_iCCP_SUPPORTED
-PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
-   png_colorspacerp colorspace, png_const_charp name,
-   png_uint_32 profile_length, png_const_bytep profile, int color_type),
-   PNG_EMPTY);
-   /* The 'name' is used for information only */
-
-/* Routines for checking parts of an ICC profile. */
-#ifdef PNG_READ_iCCP_SUPPORTED
-PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
-   png_colorspacerp colorspace, png_const_charp name,
-   png_uint_32 profile_length), PNG_EMPTY);
-#endif /* READ_iCCP */
-PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
-   png_colorspacerp colorspace, png_const_charp name,
-   png_uint_32 profile_length,
-   png_const_bytep profile /* first 132 bytes only */, int color_type),
-   PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
-   png_colorspacerp colorspace, png_const_charp name,
-   png_uint_32 profile_length,
-   png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
-#ifdef PNG_sRGB_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
-   png_const_structrp png_ptr, png_colorspacerp colorspace,
-   png_const_bytep profile, uLong adler), PNG_EMPTY);
-   /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
-    * be zero to indicate that it is not available.  It is used, if provided,
-    * as a fast check on the profile when checking to see if it is sRGB.
-    */
-#endif
-#endif /* iCCP */
-
-#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
-   (png_structrp png_ptr), PNG_EMPTY);
-   /* Set the rgb_to_gray coefficients from the colorspace Y values */
-#endif /* READ_RGB_TO_GRAY */
-#endif /* COLORSPACE */
-
-/* Added at libpng version 1.4.0 */
-PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
-    png_uint_32 width, png_uint_32 height, int bit_depth,
-    int color_type, int interlace_type, int compression_type,
-    int filter_type),PNG_EMPTY);
-
-/* Added at libpng version 1.5.10 */
-#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
-    defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
-PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
-   (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
-#endif
-
-#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
-PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
-   png_const_charp name),PNG_NORETURN);
-#endif
-
-/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
- * the end.  Always leaves the buffer nul terminated.  Never errors out (and
- * there is no error code.)
- */
-PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
-   size_t pos, png_const_charp string),PNG_EMPTY);
-
-/* Various internal functions to handle formatted warning messages, currently
- * only implemented for warnings.
- */
-#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
-/* Utility to dump an unsigned value into a buffer, given a start pointer and
- * and end pointer (which should point just *beyond* the end of the buffer!)
- * Returns the pointer to the start of the formatted string.  This utility only
- * does unsigned values.
- */
-PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
-   png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
-
-/* Convenience macro that takes an array: */
-#define PNG_FORMAT_NUMBER(buffer,format,number) \
-   png_format_number(buffer, buffer + (sizeof buffer), format, number)
-
-/* Suggested size for a number buffer (enough for 64 bits and a sign!) */
-#define PNG_NUMBER_BUFFER_SIZE 24
-
-/* These are the integer formats currently supported, the name is formed from
- * the standard printf(3) format string.
- */
-#define PNG_NUMBER_FORMAT_u     1 /* chose unsigned API! */
-#define PNG_NUMBER_FORMAT_02u   2
-#define PNG_NUMBER_FORMAT_d     1 /* chose signed API! */
-#define PNG_NUMBER_FORMAT_02d   2
-#define PNG_NUMBER_FORMAT_x     3
-#define PNG_NUMBER_FORMAT_02x   4
-#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
-#endif
-
-#ifdef PNG_WARNINGS_SUPPORTED
-/* New defines and members adding in libpng-1.5.4 */
-#  define PNG_WARNING_PARAMETER_SIZE 32
-#  define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
-
-/* An l-value of this type has to be passed to the APIs below to cache the
- * values of the parameters to a formatted warning message.
- */
-typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
-   PNG_WARNING_PARAMETER_SIZE];
-
-PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
-   int number, png_const_charp string),PNG_EMPTY);
-   /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
-    * including the trailing '\0'.
-    */
-PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
-   (png_warning_parameters p, int number, int format, png_alloc_size_t value),
-   PNG_EMPTY);
-   /* Use png_alloc_size_t because it is an unsigned type as big as any we
-    * need to output.  Use the following for a signed value.
-    */
-PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
-   (png_warning_parameters p, int number, int format, png_int_32 value),
-   PNG_EMPTY);
-
-PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
-   png_warning_parameters p, png_const_charp message),PNG_EMPTY);
-   /* 'message' follows the X/Open approach of using @1, @2 to insert
-    * parameters previously supplied using the above functions.  Errors in
-    * specifying the parameters will simply result in garbage substitutions.
-    */
-#endif
-
-#ifdef PNG_BENIGN_ERRORS_SUPPORTED
-/* Application errors (new in 1.6); use these functions (declared below) for
- * errors in the parameters or order of API function calls on read.  The
- * 'warning' should be used for an error that can be handled completely; the
- * 'error' for one which can be handled safely but which may lose application
- * information or settings.
- *
- * By default these both result in a png_error call prior to release, while in a
- * released version the 'warning' is just a warning.  However if the application
- * explicitly disables benign errors (explicitly permitting the code to lose
- * information) they both turn into warnings.
- *
- * If benign errors aren't supported they end up as the corresponding base call
- * (png_warning or png_error.)
- */
-PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
-   png_const_charp message),PNG_EMPTY);
-   /* The application provided invalid parameters to an API function or called
-    * an API function at the wrong time, libpng can completely recover.
-    */
-
-PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
-   png_const_charp message),PNG_EMPTY);
-   /* As above but libpng will ignore the call, or attempt some other partial
-    * recovery from the error.
-    */
-#else
-#  define png_app_warning(pp,s) png_warning(pp,s)
-#  define png_app_error(pp,s) png_error(pp,s)
-#endif
-
-PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
-   png_const_charp message, int error),PNG_EMPTY);
-   /* Report a recoverable issue in chunk data.  On read this is used to report
-    * a problem found while reading a particular chunk and the
-    * png_chunk_benign_error or png_chunk_warning function is used as
-    * appropriate.  On write this is used to report an error that comes from
-    * data set via an application call to a png_set_ API and png_app_error or
-    * png_app_warning is used as appropriate.
-    *
-    * The 'error' parameter must have one of the following values:
-    */
-#define PNG_CHUNK_WARNING     0 /* never an error */
-#define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
-#define PNG_CHUNK_ERROR       2 /* always an error */
-
-/* ASCII to FP interfaces, currently only implemented if sCAL
- * support is required.
- */
-#if defined(PNG_sCAL_SUPPORTED)
-/* MAX_DIGITS is actually the maximum number of characters in an sCAL
- * width or height, derived from the precision (number of significant
- * digits - a build time settable option) and assumptions about the
- * maximum ridiculous exponent.
- */
-#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
-
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
-   png_charp ascii, png_size_t size, double fp, unsigned int precision),
-   PNG_EMPTY);
-#endif /* FLOATING_POINT */
-
-#ifdef PNG_FIXED_POINT_SUPPORTED
-PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
-   png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY);
-#endif /* FIXED_POINT */
-#endif /* sCAL */
-
-#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
-/* An internal API to validate the format of a floating point number.
- * The result is the index of the next character.  If the number is
- * not valid it will be the index of a character in the supposed number.
- *
- * The format of a number is defined in the PNG extensions specification
- * and this API is strictly conformant to that spec, not anyone elses!
- *
- * The format as a regular expression is:
- *
- * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
- *
- * or:
- *
- * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
- *
- * The complexity is that either integer or fraction must be present and the
- * fraction is permitted to have no digits only if the integer is present.
- *
- * NOTE: The dangling E problem.
- *   There is a PNG valid floating point number in the following:
- *
- *       PNG floating point numbers are not greedy.
- *
- *   Working this out requires *TWO* character lookahead (because of the
- *   sign), the parser does not do this - it will fail at the 'r' - this
- *   doesn't matter for PNG sCAL chunk values, but it requires more care
- *   if the value were ever to be embedded in something more complex.  Use
- *   ANSI-C strtod if you need the lookahead.
- */
-/* State table for the parser. */
-#define PNG_FP_INTEGER    0  /* before or in integer */
-#define PNG_FP_FRACTION   1  /* before or in fraction */
-#define PNG_FP_EXPONENT   2  /* before or in exponent */
-#define PNG_FP_STATE      3  /* mask for the above */
-#define PNG_FP_SAW_SIGN   4  /* Saw +/- in current state */
-#define PNG_FP_SAW_DIGIT  8  /* Saw a digit in current state */
-#define PNG_FP_SAW_DOT   16  /* Saw a dot in current state */
-#define PNG_FP_SAW_E     32  /* Saw an E (or e) in current state */
-#define PNG_FP_SAW_ANY   60  /* Saw any of the above 4 */
-
-/* These three values don't affect the parser.  They are set but not used.
- */
-#define PNG_FP_WAS_VALID 64  /* Preceding substring is a valid fp number */
-#define PNG_FP_NEGATIVE 128  /* A negative number, including "-0" */
-#define PNG_FP_NONZERO  256  /* A non-zero value */
-#define PNG_FP_STICKY   448  /* The above three flags */
-
-/* This is available for the caller to store in 'state' if required.  Do not
- * call the parser after setting it (the parser sometimes clears it.)
- */
-#define PNG_FP_INVALID  512  /* Available for callers as a distinct value */
-
-/* Result codes for the parser (boolean - true meants ok, false means
- * not ok yet.)
- */
-#define PNG_FP_MAYBE      0  /* The number may be valid in the future */
-#define PNG_FP_OK         1  /* The number is valid */
-
-/* Tests on the sticky non-zero and negative flags.  To pass these checks
- * the state must also indicate that the whole number is valid - this is
- * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
- * is equivalent to PNG_FP_OK above.)
- */
-#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
-   /* NZ_MASK: the string is valid and a non-zero negative value */
-#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
-   /* Z MASK: the string is valid and a non-zero value. */
-   /* PNG_FP_SAW_DIGIT: the string is valid. */
-#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
-#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
-#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
-
-/* The actual parser.  This can be called repeatedly. It updates
- * the index into the string and the state variable (which must
- * be initialized to 0).  It returns a result code, as above.  There
- * is no point calling the parser any more if it fails to advance to
- * the end of the string - it is stuck on an invalid character (or
- * terminated by '\0').
- *
- * Note that the pointer will consume an E or even an E+ and then leave
- * a 'maybe' state even though a preceding integer.fraction is valid.
- * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
- * a valid number.  It's possible to recover from this by calling
- * the parser again (from the start, with state 0) but with a string
- * that omits the last character (i.e. set the size to the index of
- * the problem character.)  This has not been tested within libpng.
- */
-PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
-   png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
-
-/* This is the same but it checks a complete string and returns true
- * only if it just contains a floating point number.  As of 1.5.4 this
- * function also returns the state at the end of parsing the number if
- * it was valid (otherwise it returns 0.)  This can be used for testing
- * for negative or zero values using the sticky flag.
- */
-PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
-   png_size_t size),PNG_EMPTY);
-#endif /* pCAL || sCAL */
-
-#if defined(PNG_GAMMA_SUPPORTED) ||\
-    defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
-/* Added at libpng version 1.5.0 */
-/* This is a utility to provide a*times/div (rounded) and indicate
- * if there is an overflow.  The result is a boolean - false (0)
- * for overflow, true (1) if no overflow, in which case *res
- * holds the result.
- */
-PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
-   png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
-#endif
-
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
-/* Same deal, but issue a warning on overflow and return 0. */
-PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
-   (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
-   png_int_32 divided_by),PNG_EMPTY);
-#endif
-
-#ifdef PNG_GAMMA_SUPPORTED
-/* Calculate a reciprocal - used for gamma values.  This returns
- * 0 if the argument is 0 in order to maintain an undefined value;
- * there are no warnings.
- */
-PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
-   PNG_EMPTY);
-
-#ifdef PNG_READ_GAMMA_SUPPORTED
-/* The same but gives a reciprocal of the product of two fixed point
- * values.  Accuracy is suitable for gamma calculations but this is
- * not exact - use png_muldiv for that.  Only required at present on read.
- */
-PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
-   png_fixed_point b),PNG_EMPTY);
-#endif
-
-/* Return true if the gamma value is significantly different from 1.0 */
-PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
-   PNG_EMPTY);
-#endif
-
-#ifdef PNG_READ_GAMMA_SUPPORTED
-/* Internal fixed point gamma correction.  These APIs are called as
- * required to convert single values - they don't need to be fast,
- * they are not used when processing image pixel values.
- *
- * While the input is an 'unsigned' value it must actually be the
- * correct bit value - 0..255 or 0..65535 as required.
- */
-PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
-   unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
-   png_fixed_point gamma_value),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
-   png_fixed_point gamma_value),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
-   PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
-   int bit_depth),PNG_EMPTY);
-#endif
-
-/* SIMPLIFIED READ/WRITE SUPPORT */
-#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
-   defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
-/* The internal structure that png_image::opaque points to. */
-typedef struct png_control
-{
-   png_structp png_ptr;
-   png_infop   info_ptr;
-   png_voidp   error_buf;           /* Always a jmp_buf at present. */
-
-   png_const_bytep memory;          /* Memory buffer. */
-   png_size_t      size;            /* Size of the memory buffer. */
-
-   unsigned int for_write       :1; /* Otherwise it is a read structure */
-   unsigned int owned_file      :1; /* We own the file in io_ptr */
-} png_control;
-
-/* Return the pointer to the jmp_buf from a png_control: necessary because C
- * does not reveal the type of the elements of jmp_buf.
- */
-#ifdef __cplusplus
-#  define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
-#else
-#  define png_control_jmp_buf(pc) ((pc)->error_buf)
-#endif
-
-/* Utility to safely execute a piece of libpng code catching and logging any
- * errors that might occur.  Returns true on success, false on failure (either
- * of the function or as a result of a png_error.)
- */
-PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr,
-   png_const_charp error_message),PNG_NORETURN);
-
-#ifdef PNG_WARNINGS_SUPPORTED
-PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr,
-   png_const_charp warning_message),PNG_EMPTY);
-#else
-#  define png_safe_warning 0/*dummy argument*/
-#endif
-
-PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
-   int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
-
-/* Utility to log an error; this also cleans up the png_image; the function
- * always returns 0 (false).
- */
-PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
-   png_const_charp error_message),PNG_EMPTY);
-
-#ifndef PNG_SIMPLIFIED_READ_SUPPORTED
-/* png_image_free is used by the write code but not exported */
-PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
-#endif /* !SIMPLIFIED_READ */
-
-#endif /* SIMPLIFIED READ/WRITE */
-
-/* These are initialization functions for hardware specific PNG filter
- * optimizations; list these here then select the appropriate one at compile
- * time using the macro PNG_FILTER_OPTIMIZATIONS.  If the macro is not defined
- * the generic code is used.
- */
-#ifdef PNG_FILTER_OPTIMIZATIONS
-PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
-   unsigned int bpp), PNG_EMPTY);
-   /* Just declare the optimization that will be used */
-#else
-   /* List *all* the possible optimizations here - this branch is required if
-    * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
-    * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
-    */
-#  if PNG_ARM_NEON_OPT > 0
-PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
-   (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
-#endif
-
-#if PNG_MIPS_MSA_OPT > 0
-PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa,
-   (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
-#endif
-
-#  if PNG_INTEL_SSE_IMPLEMENTATION > 0
-PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2,
-   (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
-#  endif
-#endif
-
-PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr,
-   png_const_charp key, png_bytep new_key), PNG_EMPTY);
-
-/* Maintainer: Put new private prototypes here ^ */
-
-#include "pngdebug.h"
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* PNG_VERSION_INFO_ONLY */
-#endif /* PNGPRIV_H */
diff --git a/src/png/libpng/pngread.c b/src/png/libpng/pngread.c
deleted file mode 100644
index da32e9ad9..000000000
--- a/src/png/libpng/pngread.c
+++ /dev/null
@@ -1,4219 +0,0 @@
-
-/* pngread.c - read a PNG file
- *
- * Last changed in libpng 1.6.33 [September 28, 2017]
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * This file contains routines that an application calls directly to
- * read a PNG file or stream.
- */
-
-#include "pngpriv.h"
-#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
-#  include <errno.h>
-#endif
-
-#ifdef PNG_READ_SUPPORTED
-
-/* Create a PNG structure for reading, and allocate any memory needed. */
-PNG_FUNCTION(png_structp,PNGAPI
-png_create_read_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
-    png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED)
-{
-#ifndef PNG_USER_MEM_SUPPORTED
-   png_structp png_ptr = png_create_png_struct(user_png_ver, error_ptr,
-        error_fn, warn_fn, NULL, NULL, NULL);
-#else
-   return png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
-        warn_fn, NULL, NULL, NULL);
-}
-
-/* Alternate create PNG structure for reading, and allocate any memory
- * needed.
- */
-PNG_FUNCTION(png_structp,PNGAPI
-png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
-    png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
-    png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED)
-{
-   png_structp png_ptr = png_create_png_struct(user_png_ver, error_ptr,
-       error_fn, warn_fn, mem_ptr, malloc_fn, free_fn);
-#endif /* USER_MEM */
-
-   if (png_ptr != NULL)
-   {
-      png_ptr->mode = PNG_IS_READ_STRUCT;
-
-      /* Added in libpng-1.6.0; this can be used to detect a read structure if
-       * required (it will be zero in a write structure.)
-       */
-#     ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-         png_ptr->IDAT_read_size = PNG_IDAT_READ_SIZE;
-#     endif
-
-#     ifdef PNG_BENIGN_READ_ERRORS_SUPPORTED
-         png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN;
-
-         /* In stable builds only warn if an application error can be completely
-          * handled.
-          */
-#        if PNG_RELEASE_BUILD
-            png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN;
-#        endif
-#     endif
-
-      /* TODO: delay this, it can be done in png_init_io (if the app doesn't
-       * do it itself) avoiding setting the default function if it is not
-       * required.
-       */
-      png_set_read_fn(png_ptr, NULL, NULL);
-   }
-
-   return png_ptr;
-}
-
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-/* Read the information before the actual image data.  This has been
- * changed in v0.90 to allow reading a file that already has the magic
- * bytes read from the stream.  You can tell libpng how many bytes have
- * been read from the beginning of the stream (up to the maximum of 8)
- * via png_set_sig_bytes(), and we will only check the remaining bytes
- * here.  The application can then have access to the signature bytes we
- * read if it is determined that this isn't a valid PNG file.
- */
-void PNGAPI
-png_read_info(png_structrp png_ptr, png_inforp info_ptr)
-{
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-   int keep;
-#endif
-
-   png_debug(1, "in png_read_info");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   /* Read and check the PNG file signature. */
-   png_read_sig(png_ptr, info_ptr);
-
-   for (;;)
-   {
-      png_uint_32 length = png_read_chunk_header(png_ptr);
-      png_uint_32 chunk_name = png_ptr->chunk_name;
-
-      /* IDAT logic needs to happen here to simplify getting the two flags
-       * right.
-       */
-      if (chunk_name == png_IDAT)
-      {
-         if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-            png_chunk_error(png_ptr, "Missing IHDR before IDAT");
-
-         else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
-             (png_ptr->mode & PNG_HAVE_PLTE) == 0)
-            png_chunk_error(png_ptr, "Missing PLTE before IDAT");
-
-         else if ((png_ptr->mode & PNG_AFTER_IDAT) != 0)
-            png_chunk_benign_error(png_ptr, "Too many IDATs found");
-
-         png_ptr->mode |= PNG_HAVE_IDAT;
-      }
-
-      else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
-      {
-         png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
-         png_ptr->mode |= PNG_AFTER_IDAT;
-      }
-
-      /* This should be a binary subdivision search or a hash for
-       * matching the chunk name rather than a linear search.
-       */
-      if (chunk_name == png_IHDR)
-         png_handle_IHDR(png_ptr, info_ptr, length);
-
-      else if (chunk_name == png_IEND)
-         png_handle_IEND(png_ptr, info_ptr, length);
-
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-      else if ((keep = png_chunk_unknown_handling(png_ptr, chunk_name)) != 0)
-      {
-         png_handle_unknown(png_ptr, info_ptr, length, keep);
-
-         if (chunk_name == png_PLTE)
-            png_ptr->mode |= PNG_HAVE_PLTE;
-
-         else if (chunk_name == png_IDAT)
-         {
-            png_ptr->idat_size = 0; /* It has been consumed */
-            break;
-         }
-      }
-#endif
-      else if (chunk_name == png_PLTE)
-         png_handle_PLTE(png_ptr, info_ptr, length);
-
-      else if (chunk_name == png_IDAT)
-      {
-         png_ptr->idat_size = length;
-         break;
-      }
-
-#ifdef PNG_READ_bKGD_SUPPORTED
-      else if (chunk_name == png_bKGD)
-         png_handle_bKGD(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_cHRM_SUPPORTED
-      else if (chunk_name == png_cHRM)
-         png_handle_cHRM(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_eXIf_SUPPORTED
-      else if (chunk_name == png_eXIf)
-         png_handle_eXIf(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_gAMA_SUPPORTED
-      else if (chunk_name == png_gAMA)
-         png_handle_gAMA(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_hIST_SUPPORTED
-      else if (chunk_name == png_hIST)
-         png_handle_hIST(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_oFFs_SUPPORTED
-      else if (chunk_name == png_oFFs)
-         png_handle_oFFs(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_pCAL_SUPPORTED
-      else if (chunk_name == png_pCAL)
-         png_handle_pCAL(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_sCAL_SUPPORTED
-      else if (chunk_name == png_sCAL)
-         png_handle_sCAL(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_pHYs_SUPPORTED
-      else if (chunk_name == png_pHYs)
-         png_handle_pHYs(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_sBIT_SUPPORTED
-      else if (chunk_name == png_sBIT)
-         png_handle_sBIT(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_sRGB_SUPPORTED
-      else if (chunk_name == png_sRGB)
-         png_handle_sRGB(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_iCCP_SUPPORTED
-      else if (chunk_name == png_iCCP)
-         png_handle_iCCP(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_sPLT_SUPPORTED
-      else if (chunk_name == png_sPLT)
-         png_handle_sPLT(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_tEXt_SUPPORTED
-      else if (chunk_name == png_tEXt)
-         png_handle_tEXt(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_tIME_SUPPORTED
-      else if (chunk_name == png_tIME)
-         png_handle_tIME(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_tRNS_SUPPORTED
-      else if (chunk_name == png_tRNS)
-         png_handle_tRNS(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_zTXt_SUPPORTED
-      else if (chunk_name == png_zTXt)
-         png_handle_zTXt(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_iTXt_SUPPORTED
-      else if (chunk_name == png_iTXt)
-         png_handle_iTXt(png_ptr, info_ptr, length);
-#endif
-
-      else
-         png_handle_unknown(png_ptr, info_ptr, length,
-             PNG_HANDLE_CHUNK_AS_DEFAULT);
-   }
-}
-#endif /* SEQUENTIAL_READ */
-
-/* Optional call to update the users info_ptr structure */
-void PNGAPI
-png_read_update_info(png_structrp png_ptr, png_inforp info_ptr)
-{
-   png_debug(1, "in png_read_update_info");
-
-   if (png_ptr != NULL)
-   {
-      if ((png_ptr->flags & PNG_FLAG_ROW_INIT) == 0)
-      {
-         png_read_start_row(png_ptr);
-
-#        ifdef PNG_READ_TRANSFORMS_SUPPORTED
-            png_read_transform_info(png_ptr, info_ptr);
-#        else
-            PNG_UNUSED(info_ptr)
-#        endif
-      }
-
-      /* New in 1.6.0 this avoids the bug of doing the initializations twice */
-      else
-         png_app_error(png_ptr,
-             "png_read_update_info/png_start_read_image: duplicate call");
-   }
-}
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-/* Initialize palette, background, etc, after transformations
- * are set, but before any reading takes place.  This allows
- * the user to obtain a gamma-corrected palette, for example.
- * If the user doesn't call this, we will do it ourselves.
- */
-void PNGAPI
-png_start_read_image(png_structrp png_ptr)
-{
-   png_debug(1, "in png_start_read_image");
-
-   if (png_ptr != NULL)
-   {
-      if ((png_ptr->flags & PNG_FLAG_ROW_INIT) == 0)
-         png_read_start_row(png_ptr);
-
-      /* New in 1.6.0 this avoids the bug of doing the initializations twice */
-      else
-         png_app_error(png_ptr,
-             "png_start_read_image/png_read_update_info: duplicate call");
-   }
-}
-#endif /* SEQUENTIAL_READ */
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-/* Undoes intrapixel differencing,
- * NOTE: this is apparently only supported in the 'sequential' reader.
- */
-static void
-png_do_read_intrapixel(png_row_infop row_info, png_bytep row)
-{
-   png_debug(1, "in png_do_read_intrapixel");
-
-   if (
-       (row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
-   {
-      int bytes_per_pixel;
-      png_uint_32 row_width = row_info->width;
-
-      if (row_info->bit_depth == 8)
-      {
-         png_bytep rp;
-         png_uint_32 i;
-
-         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
-            bytes_per_pixel = 3;
-
-         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
-            bytes_per_pixel = 4;
-
-         else
-            return;
-
-         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
-         {
-            *(rp) = (png_byte)((256 + *rp + *(rp + 1)) & 0xff);
-            *(rp+2) = (png_byte)((256 + *(rp + 2) + *(rp + 1)) & 0xff);
-         }
-      }
-      else if (row_info->bit_depth == 16)
-      {
-         png_bytep rp;
-         png_uint_32 i;
-
-         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
-            bytes_per_pixel = 6;
-
-         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
-            bytes_per_pixel = 8;
-
-         else
-            return;
-
-         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
-         {
-            png_uint_32 s0   = (png_uint_32)(*(rp    ) << 8) | *(rp + 1);
-            png_uint_32 s1   = (png_uint_32)(*(rp + 2) << 8) | *(rp + 3);
-            png_uint_32 s2   = (png_uint_32)(*(rp + 4) << 8) | *(rp + 5);
-            png_uint_32 red  = (s0 + s1 + 65536) & 0xffff;
-            png_uint_32 blue = (s2 + s1 + 65536) & 0xffff;
-            *(rp    ) = (png_byte)((red >> 8) & 0xff);
-            *(rp + 1) = (png_byte)(red & 0xff);
-            *(rp + 4) = (png_byte)((blue >> 8) & 0xff);
-            *(rp + 5) = (png_byte)(blue & 0xff);
-         }
-      }
-   }
-}
-#endif /* MNG_FEATURES */
-
-void PNGAPI
-png_read_row(png_structrp png_ptr, png_bytep row, png_bytep dsp_row)
-{
-   png_row_info row_info;
-
-   if (png_ptr == NULL)
-      return;
-
-   png_debug2(1, "in png_read_row (row %lu, pass %d)",
-       (unsigned long)png_ptr->row_number, png_ptr->pass);
-
-   /* png_read_start_row sets the information (in particular iwidth) for this
-    * interlace pass.
-    */
-   if ((png_ptr->flags & PNG_FLAG_ROW_INIT) == 0)
-      png_read_start_row(png_ptr);
-
-   /* 1.5.6: row_info moved out of png_struct to a local here. */
-   row_info.width = png_ptr->iwidth; /* NOTE: width of current interlaced row */
-   row_info.color_type = png_ptr->color_type;
-   row_info.bit_depth = png_ptr->bit_depth;
-   row_info.channels = png_ptr->channels;
-   row_info.pixel_depth = png_ptr->pixel_depth;
-   row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width);
-
-#ifdef PNG_WARNINGS_SUPPORTED
-   if (png_ptr->row_number == 0 && png_ptr->pass == 0)
-   {
-   /* Check for transforms that have been set but were defined out */
-#if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
-   if ((png_ptr->transformations & PNG_INVERT_MONO) != 0)
-      png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined");
-#endif
-
-#if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
-   if ((png_ptr->transformations & PNG_FILLER) != 0)
-      png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined");
-#endif
-
-#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \
-    !defined(PNG_READ_PACKSWAP_SUPPORTED)
-   if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
-      png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined");
-#endif
-
-#if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
-   if ((png_ptr->transformations & PNG_PACK) != 0)
-      png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined");
-#endif
-
-#if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
-   if ((png_ptr->transformations & PNG_SHIFT) != 0)
-      png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined");
-#endif
-
-#if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
-   if ((png_ptr->transformations & PNG_BGR) != 0)
-      png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined");
-#endif
-
-#if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
-   if ((png_ptr->transformations & PNG_SWAP_BYTES) != 0)
-      png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined");
-#endif
-   }
-#endif /* WARNINGS */
-
-#ifdef PNG_READ_INTERLACING_SUPPORTED
-   /* If interlaced and we do not need a new row, combine row and return.
-    * Notice that the pixels we have from previous rows have been transformed
-    * already; we can only combine like with like (transformed or
-    * untransformed) and, because of the libpng API for interlaced images, this
-    * means we must transform before de-interlacing.
-    */
-   if (png_ptr->interlaced != 0 &&
-       (png_ptr->transformations & PNG_INTERLACE) != 0)
-   {
-      switch (png_ptr->pass)
-      {
-         case 0:
-            if (png_ptr->row_number & 0x07)
-            {
-               if (dsp_row != NULL)
-                  png_combine_row(png_ptr, dsp_row, 1/*display*/);
-               png_read_finish_row(png_ptr);
-               return;
-            }
-            break;
-
-         case 1:
-            if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
-            {
-               if (dsp_row != NULL)
-                  png_combine_row(png_ptr, dsp_row, 1/*display*/);
-
-               png_read_finish_row(png_ptr);
-               return;
-            }
-            break;
-
-         case 2:
-            if ((png_ptr->row_number & 0x07) != 4)
-            {
-               if (dsp_row != NULL && (png_ptr->row_number & 4))
-                  png_combine_row(png_ptr, dsp_row, 1/*display*/);
-
-               png_read_finish_row(png_ptr);
-               return;
-            }
-            break;
-
-         case 3:
-            if ((png_ptr->row_number & 3) || png_ptr->width < 3)
-            {
-               if (dsp_row != NULL)
-                  png_combine_row(png_ptr, dsp_row, 1/*display*/);
-
-               png_read_finish_row(png_ptr);
-               return;
-            }
-            break;
-
-         case 4:
-            if ((png_ptr->row_number & 3) != 2)
-            {
-               if (dsp_row != NULL && (png_ptr->row_number & 2))
-                  png_combine_row(png_ptr, dsp_row, 1/*display*/);
-
-               png_read_finish_row(png_ptr);
-               return;
-            }
-            break;
-
-         case 5:
-            if ((png_ptr->row_number & 1) || png_ptr->width < 2)
-            {
-               if (dsp_row != NULL)
-                  png_combine_row(png_ptr, dsp_row, 1/*display*/);
-
-               png_read_finish_row(png_ptr);
-               return;
-            }
-            break;
-
-         default:
-         case 6:
-            if ((png_ptr->row_number & 1) == 0)
-            {
-               png_read_finish_row(png_ptr);
-               return;
-            }
-            break;
-      }
-   }
-#endif
-
-   if ((png_ptr->mode & PNG_HAVE_IDAT) == 0)
-      png_error(png_ptr, "Invalid attempt to read row data");
-
-   /* Fill the row with IDAT data: */
-   png_ptr->row_buf[0]=255; /* to force error if no data was found */
-   png_read_IDAT_data(png_ptr, png_ptr->row_buf, row_info.rowbytes + 1);
-
-   if (png_ptr->row_buf[0] > PNG_FILTER_VALUE_NONE)
-   {
-      if (png_ptr->row_buf[0] < PNG_FILTER_VALUE_LAST)
-         png_read_filter_row(png_ptr, &row_info, png_ptr->row_buf + 1,
-             png_ptr->prev_row + 1, png_ptr->row_buf[0]);
-      else
-         png_error(png_ptr, "bad adaptive filter value");
-   }
-
-   /* libpng 1.5.6: the following line was copying png_ptr->rowbytes before
-    * 1.5.6, while the buffer really is this big in current versions of libpng
-    * it may not be in the future, so this was changed just to copy the
-    * interlaced count:
-    */
-   memcpy(png_ptr->prev_row, png_ptr->row_buf, row_info.rowbytes + 1);
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-   if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) != 0 &&
-       (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
-   {
-      /* Intrapixel differencing */
-      png_do_read_intrapixel(&row_info, png_ptr->row_buf + 1);
-   }
-#endif
-
-#ifdef PNG_READ_TRANSFORMS_SUPPORTED
-   if (png_ptr->transformations)
-      png_do_read_transformations(png_ptr, &row_info);
-#endif
-
-   /* The transformed pixel depth should match the depth now in row_info. */
-   if (png_ptr->transformed_pixel_depth == 0)
-   {
-      png_ptr->transformed_pixel_depth = row_info.pixel_depth;
-      if (row_info.pixel_depth > png_ptr->maximum_pixel_depth)
-         png_error(png_ptr, "sequential row overflow");
-   }
-
-   else if (png_ptr->transformed_pixel_depth != row_info.pixel_depth)
-      png_error(png_ptr, "internal sequential row size calculation error");
-
-#ifdef PNG_READ_INTERLACING_SUPPORTED
-   /* Expand interlaced rows to full size */
-   if (png_ptr->interlaced != 0 &&
-      (png_ptr->transformations & PNG_INTERLACE) != 0)
-   {
-      if (png_ptr->pass < 6)
-         png_do_read_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass,
-             png_ptr->transformations);
-
-      if (dsp_row != NULL)
-         png_combine_row(png_ptr, dsp_row, 1/*display*/);
-
-      if (row != NULL)
-         png_combine_row(png_ptr, row, 0/*row*/);
-   }
-
-   else
-#endif
-   {
-      if (row != NULL)
-         png_combine_row(png_ptr, row, -1/*ignored*/);
-
-      if (dsp_row != NULL)
-         png_combine_row(png_ptr, dsp_row, -1/*ignored*/);
-   }
-   png_read_finish_row(png_ptr);
-
-   if (png_ptr->read_row_fn != NULL)
-      (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
-
-}
-#endif /* SEQUENTIAL_READ */
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-/* Read one or more rows of image data.  If the image is interlaced,
- * and png_set_interlace_handling() has been called, the rows need to
- * contain the contents of the rows from the previous pass.  If the
- * image has alpha or transparency, and png_handle_alpha()[*] has been
- * called, the rows contents must be initialized to the contents of the
- * screen.
- *
- * "row" holds the actual image, and pixels are placed in it
- * as they arrive.  If the image is displayed after each pass, it will
- * appear to "sparkle" in.  "display_row" can be used to display a
- * "chunky" progressive image, with finer detail added as it becomes
- * available.  If you do not want this "chunky" display, you may pass
- * NULL for display_row.  If you do not want the sparkle display, and
- * you have not called png_handle_alpha(), you may pass NULL for rows.
- * If you have called png_handle_alpha(), and the image has either an
- * alpha channel or a transparency chunk, you must provide a buffer for
- * rows.  In this case, you do not have to provide a display_row buffer
- * also, but you may.  If the image is not interlaced, or if you have
- * not called png_set_interlace_handling(), the display_row buffer will
- * be ignored, so pass NULL to it.
- *
- * [*] png_handle_alpha() does not exist yet, as of this version of libpng
- */
-
-void PNGAPI
-png_read_rows(png_structrp png_ptr, png_bytepp row,
-    png_bytepp display_row, png_uint_32 num_rows)
-{
-   png_uint_32 i;
-   png_bytepp rp;
-   png_bytepp dp;
-
-   png_debug(1, "in png_read_rows");
-
-   if (png_ptr == NULL)
-      return;
-
-   rp = row;
-   dp = display_row;
-   if (rp != NULL && dp != NULL)
-      for (i = 0; i < num_rows; i++)
-      {
-         png_bytep rptr = *rp++;
-         png_bytep dptr = *dp++;
-
-         png_read_row(png_ptr, rptr, dptr);
-      }
-
-   else if (rp != NULL)
-      for (i = 0; i < num_rows; i++)
-      {
-         png_bytep rptr = *rp;
-         png_read_row(png_ptr, rptr, NULL);
-         rp++;
-      }
-
-   else if (dp != NULL)
-      for (i = 0; i < num_rows; i++)
-      {
-         png_bytep dptr = *dp;
-         png_read_row(png_ptr, NULL, dptr);
-         dp++;
-      }
-}
-#endif /* SEQUENTIAL_READ */
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-/* Read the entire image.  If the image has an alpha channel or a tRNS
- * chunk, and you have called png_handle_alpha()[*], you will need to
- * initialize the image to the current image that PNG will be overlaying.
- * We set the num_rows again here, in case it was incorrectly set in
- * png_read_start_row() by a call to png_read_update_info() or
- * png_start_read_image() if png_set_interlace_handling() wasn't called
- * prior to either of these functions like it should have been.  You can
- * only call this function once.  If you desire to have an image for
- * each pass of a interlaced image, use png_read_rows() instead.
- *
- * [*] png_handle_alpha() does not exist yet, as of this version of libpng
- */
-void PNGAPI
-png_read_image(png_structrp png_ptr, png_bytepp image)
-{
-   png_uint_32 i, image_height;
-   int pass, j;
-   png_bytepp rp;
-
-   png_debug(1, "in png_read_image");
-
-   if (png_ptr == NULL)
-      return;
-
-#ifdef PNG_READ_INTERLACING_SUPPORTED
-   if ((png_ptr->flags & PNG_FLAG_ROW_INIT) == 0)
-   {
-      pass = png_set_interlace_handling(png_ptr);
-      /* And make sure transforms are initialized. */
-      png_start_read_image(png_ptr);
-   }
-   else
-   {
-      if (png_ptr->interlaced != 0 &&
-          (png_ptr->transformations & PNG_INTERLACE) == 0)
-      {
-         /* Caller called png_start_read_image or png_read_update_info without
-          * first turning on the PNG_INTERLACE transform.  We can fix this here,
-          * but the caller should do it!
-          */
-         png_warning(png_ptr, "Interlace handling should be turned on when "
-             "using png_read_image");
-         /* Make sure this is set correctly */
-         png_ptr->num_rows = png_ptr->height;
-      }
-
-      /* Obtain the pass number, which also turns on the PNG_INTERLACE flag in
-       * the above error case.
-       */
-      pass = png_set_interlace_handling(png_ptr);
-   }
-#else
-   if (png_ptr->interlaced)
-      png_error(png_ptr,
-          "Cannot read interlaced image -- interlace handler disabled");
-
-   pass = 1;
-#endif
-
-   image_height=png_ptr->height;
-
-   for (j = 0; j < pass; j++)
-   {
-      rp = image;
-      for (i = 0; i < image_height; i++)
-      {
-         png_read_row(png_ptr, *rp, NULL);
-         rp++;
-      }
-   }
-}
-#endif /* SEQUENTIAL_READ */
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-/* Read the end of the PNG file.  Will not read past the end of the
- * file, will verify the end is accurate, and will read any comments
- * or time information at the end of the file, if info is not NULL.
- */
-void PNGAPI
-png_read_end(png_structrp png_ptr, png_inforp info_ptr)
-{
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-   int keep;
-#endif
-
-   png_debug(1, "in png_read_end");
-
-   if (png_ptr == NULL)
-      return;
-
-   /* If png_read_end is called in the middle of reading the rows there may
-    * still be pending IDAT data and an owned zstream.  Deal with this here.
-    */
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-   if (png_chunk_unknown_handling(png_ptr, png_IDAT) == 0)
-#endif
-      png_read_finish_IDAT(png_ptr);
-
-#ifdef PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED
-   /* Report invalid palette index; added at libng-1.5.10 */
-   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
-       png_ptr->num_palette_max > png_ptr->num_palette)
-      png_benign_error(png_ptr, "Read palette index exceeding num_palette");
-#endif
-
-   do
-   {
-      png_uint_32 length = png_read_chunk_header(png_ptr);
-      png_uint_32 chunk_name = png_ptr->chunk_name;
-
-      if (chunk_name != png_IDAT)
-         png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
-
-      if (chunk_name == png_IEND)
-         png_handle_IEND(png_ptr, info_ptr, length);
-
-      else if (chunk_name == png_IHDR)
-         png_handle_IHDR(png_ptr, info_ptr, length);
-
-      else if (info_ptr == NULL)
-         png_crc_finish(png_ptr, length);
-
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-      else if ((keep = png_chunk_unknown_handling(png_ptr, chunk_name)) != 0)
-      {
-         if (chunk_name == png_IDAT)
-         {
-            if ((length > 0 && !(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED))
-                || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT) != 0)
-               png_benign_error(png_ptr, ".Too many IDATs found");
-         }
-         png_handle_unknown(png_ptr, info_ptr, length, keep);
-         if (chunk_name == png_PLTE)
-            png_ptr->mode |= PNG_HAVE_PLTE;
-      }
-#endif
-
-      else if (chunk_name == png_IDAT)
-      {
-         /* Zero length IDATs are legal after the last IDAT has been
-          * read, but not after other chunks have been read.  1.6 does not
-          * always read all the deflate data; specifically it cannot be relied
-          * upon to read the Adler32 at the end.  If it doesn't ignore IDAT
-          * chunks which are longer than zero as well:
-          */
-         if ((length > 0 && !(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED))
-             || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT) != 0)
-            png_benign_error(png_ptr, "..Too many IDATs found");
-
-         png_crc_finish(png_ptr, length);
-      }
-      else if (chunk_name == png_PLTE)
-         png_handle_PLTE(png_ptr, info_ptr, length);
-
-#ifdef PNG_READ_bKGD_SUPPORTED
-      else if (chunk_name == png_bKGD)
-         png_handle_bKGD(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_cHRM_SUPPORTED
-      else if (chunk_name == png_cHRM)
-         png_handle_cHRM(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_eXIf_SUPPORTED
-      else if (chunk_name == png_eXIf)
-         png_handle_eXIf(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_gAMA_SUPPORTED
-      else if (chunk_name == png_gAMA)
-         png_handle_gAMA(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_hIST_SUPPORTED
-      else if (chunk_name == png_hIST)
-         png_handle_hIST(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_oFFs_SUPPORTED
-      else if (chunk_name == png_oFFs)
-         png_handle_oFFs(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_pCAL_SUPPORTED
-      else if (chunk_name == png_pCAL)
-         png_handle_pCAL(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_sCAL_SUPPORTED
-      else if (chunk_name == png_sCAL)
-         png_handle_sCAL(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_pHYs_SUPPORTED
-      else if (chunk_name == png_pHYs)
-         png_handle_pHYs(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_sBIT_SUPPORTED
-      else if (chunk_name == png_sBIT)
-         png_handle_sBIT(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_sRGB_SUPPORTED
-      else if (chunk_name == png_sRGB)
-         png_handle_sRGB(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_iCCP_SUPPORTED
-      else if (chunk_name == png_iCCP)
-         png_handle_iCCP(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_sPLT_SUPPORTED
-      else if (chunk_name == png_sPLT)
-         png_handle_sPLT(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_tEXt_SUPPORTED
-      else if (chunk_name == png_tEXt)
-         png_handle_tEXt(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_tIME_SUPPORTED
-      else if (chunk_name == png_tIME)
-         png_handle_tIME(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_tRNS_SUPPORTED
-      else if (chunk_name == png_tRNS)
-         png_handle_tRNS(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_zTXt_SUPPORTED
-      else if (chunk_name == png_zTXt)
-         png_handle_zTXt(png_ptr, info_ptr, length);
-#endif
-
-#ifdef PNG_READ_iTXt_SUPPORTED
-      else if (chunk_name == png_iTXt)
-         png_handle_iTXt(png_ptr, info_ptr, length);
-#endif
-
-      else
-         png_handle_unknown(png_ptr, info_ptr, length,
-             PNG_HANDLE_CHUNK_AS_DEFAULT);
-   } while ((png_ptr->mode & PNG_HAVE_IEND) == 0);
-}
-#endif /* SEQUENTIAL_READ */
-
-/* Free all memory used in the read struct */
-static void
-png_read_destroy(png_structrp png_ptr)
-{
-   png_debug(1, "in png_read_destroy");
-
-#ifdef PNG_READ_GAMMA_SUPPORTED
-   png_destroy_gamma_table(png_ptr);
-#endif
-
-   png_free(png_ptr, png_ptr->big_row_buf);
-   png_ptr->big_row_buf = NULL;
-   png_free(png_ptr, png_ptr->big_prev_row);
-   png_ptr->big_prev_row = NULL;
-   png_free(png_ptr, png_ptr->read_buffer);
-   png_ptr->read_buffer = NULL;
-
-#ifdef PNG_READ_QUANTIZE_SUPPORTED
-   png_free(png_ptr, png_ptr->palette_lookup);
-   png_ptr->palette_lookup = NULL;
-   png_free(png_ptr, png_ptr->quantize_index);
-   png_ptr->quantize_index = NULL;
-#endif
-
-   if ((png_ptr->free_me & PNG_FREE_PLTE) != 0)
-   {
-      png_zfree(png_ptr, png_ptr->palette);
-      png_ptr->palette = NULL;
-   }
-   png_ptr->free_me &= ~PNG_FREE_PLTE;
-
-#if defined(PNG_tRNS_SUPPORTED) || \
-    defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   if ((png_ptr->free_me & PNG_FREE_TRNS) != 0)
-   {
-      png_free(png_ptr, png_ptr->trans_alpha);
-      png_ptr->trans_alpha = NULL;
-   }
-   png_ptr->free_me &= ~PNG_FREE_TRNS;
-#endif
-
-   inflateEnd(&png_ptr->zstream);
-
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-   png_free(png_ptr, png_ptr->save_buffer);
-   png_ptr->save_buffer = NULL;
-#endif
-
-#if defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) && \
-   defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
-   png_free(png_ptr, png_ptr->unknown_chunk.data);
-   png_ptr->unknown_chunk.data = NULL;
-#endif
-
-#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
-   png_free(png_ptr, png_ptr->chunk_list);
-   png_ptr->chunk_list = NULL;
-#endif
-
-   /* NOTE: the 'setjmp' buffer may still be allocated and the memory and error
-    * callbacks are still set at this point.  They are required to complete the
-    * destruction of the png_struct itself.
-    */
-}
-
-/* Free all memory used by the read */
-void PNGAPI
-png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
-    png_infopp end_info_ptr_ptr)
-{
-   png_structrp png_ptr = NULL;
-
-   png_debug(1, "in png_destroy_read_struct");
-
-   if (png_ptr_ptr != NULL)
-      png_ptr = *png_ptr_ptr;
-
-   if (png_ptr == NULL)
-      return;
-
-   /* libpng 1.6.0: use the API to destroy info structs to ensure consistent
-    * behavior.  Prior to 1.6.0 libpng did extra 'info' destruction in this API.
-    * The extra was, apparently, unnecessary yet this hides memory leak bugs.
-    */
-   png_destroy_info_struct(png_ptr, end_info_ptr_ptr);
-   png_destroy_info_struct(png_ptr, info_ptr_ptr);
-
-   *png_ptr_ptr = NULL;
-   png_read_destroy(png_ptr);
-   png_destroy_png_struct(png_ptr);
-}
-
-void PNGAPI
-png_set_read_status_fn(png_structrp png_ptr, png_read_status_ptr read_row_fn)
-{
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->read_row_fn = read_row_fn;
-}
-
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-#ifdef PNG_INFO_IMAGE_SUPPORTED
-void PNGAPI
-png_read_png(png_structrp png_ptr, png_inforp info_ptr,
-    int transforms, voidp params)
-{
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   /* png_read_info() gives us all of the information from the
-    * PNG file before the first IDAT (image data chunk).
-    */
-   png_read_info(png_ptr, info_ptr);
-   if (info_ptr->height > PNG_UINT_32_MAX/(sizeof (png_bytep)))
-      png_error(png_ptr, "Image is too high to process with png_read_png()");
-
-   /* -------------- image transformations start here ------------------- */
-   /* libpng 1.6.10: add code to cause a png_app_error if a selected TRANSFORM
-    * is not implemented.  This will only happen in de-configured (non-default)
-    * libpng builds.  The results can be unexpected - png_read_png may return
-    * short or mal-formed rows because the transform is skipped.
-    */
-
-   /* Tell libpng to strip 16-bit/color files down to 8 bits per color.
-    */
-   if ((transforms & PNG_TRANSFORM_SCALE_16) != 0)
-      /* Added at libpng-1.5.4. "strip_16" produces the same result that it
-       * did in earlier versions, while "scale_16" is now more accurate.
-       */
-#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
-      png_set_scale_16(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_SCALE_16 not supported");
-#endif
-
-   /* If both SCALE and STRIP are required pngrtran will effectively cancel the
-    * latter by doing SCALE first.  This is ok and allows apps not to check for
-    * which is supported to get the right answer.
-    */
-   if ((transforms & PNG_TRANSFORM_STRIP_16) != 0)
-#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
-      png_set_strip_16(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_STRIP_16 not supported");
-#endif
-
-   /* Strip alpha bytes from the input data without combining with
-    * the background (not recommended).
-    */
-   if ((transforms & PNG_TRANSFORM_STRIP_ALPHA) != 0)
-#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
-      png_set_strip_alpha(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_STRIP_ALPHA not supported");
-#endif
-
-   /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single
-    * byte into separate bytes (useful for paletted and grayscale images).
-    */
-   if ((transforms & PNG_TRANSFORM_PACKING) != 0)
-#ifdef PNG_READ_PACK_SUPPORTED
-      png_set_packing(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_PACKING not supported");
-#endif
-
-   /* Change the order of packed pixels to least significant bit first
-    * (not useful if you are using png_set_packing).
-    */
-   if ((transforms & PNG_TRANSFORM_PACKSWAP) != 0)
-#ifdef PNG_READ_PACKSWAP_SUPPORTED
-      png_set_packswap(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_PACKSWAP not supported");
-#endif
-
-   /* Expand paletted colors into true RGB triplets
-    * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
-    * Expand paletted or RGB images with transparency to full alpha
-    * channels so the data will be available as RGBA quartets.
-    */
-   if ((transforms & PNG_TRANSFORM_EXPAND) != 0)
-#ifdef PNG_READ_EXPAND_SUPPORTED
-      png_set_expand(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_EXPAND not supported");
-#endif
-
-   /* We don't handle background color or gamma transformation or quantizing.
-    */
-
-   /* Invert monochrome files to have 0 as white and 1 as black
-    */
-   if ((transforms & PNG_TRANSFORM_INVERT_MONO) != 0)
-#ifdef PNG_READ_INVERT_SUPPORTED
-      png_set_invert_mono(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_INVERT_MONO not supported");
-#endif
-
-   /* If you want to shift the pixel values from the range [0,255] or
-    * [0,65535] to the original [0,7] or [0,31], or whatever range the
-    * colors were originally in:
-    */
-   if ((transforms & PNG_TRANSFORM_SHIFT) != 0)
-#ifdef PNG_READ_SHIFT_SUPPORTED
-      if ((info_ptr->valid & PNG_INFO_sBIT) != 0)
-         png_set_shift(png_ptr, &info_ptr->sig_bit);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_SHIFT not supported");
-#endif
-
-   /* Flip the RGB pixels to BGR (or RGBA to BGRA) */
-   if ((transforms & PNG_TRANSFORM_BGR) != 0)
-#ifdef PNG_READ_BGR_SUPPORTED
-      png_set_bgr(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_BGR not supported");
-#endif
-
-   /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
-   if ((transforms & PNG_TRANSFORM_SWAP_ALPHA) != 0)
-#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
-      png_set_swap_alpha(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_SWAP_ALPHA not supported");
-#endif
-
-   /* Swap bytes of 16-bit files to least significant byte first */
-   if ((transforms & PNG_TRANSFORM_SWAP_ENDIAN) != 0)
-#ifdef PNG_READ_SWAP_SUPPORTED
-      png_set_swap(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_SWAP_ENDIAN not supported");
-#endif
-
-/* Added at libpng-1.2.41 */
-   /* Invert the alpha channel from opacity to transparency */
-   if ((transforms & PNG_TRANSFORM_INVERT_ALPHA) != 0)
-#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
-      png_set_invert_alpha(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_INVERT_ALPHA not supported");
-#endif
-
-/* Added at libpng-1.2.41 */
-   /* Expand grayscale image to RGB */
-   if ((transforms & PNG_TRANSFORM_GRAY_TO_RGB) != 0)
-#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
-      png_set_gray_to_rgb(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_GRAY_TO_RGB not supported");
-#endif
-
-/* Added at libpng-1.5.4 */
-   if ((transforms & PNG_TRANSFORM_EXPAND_16) != 0)
-#ifdef PNG_READ_EXPAND_16_SUPPORTED
-      png_set_expand_16(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_EXPAND_16 not supported");
-#endif
-
-   /* We don't handle adding filler bytes */
-
-   /* We use png_read_image and rely on that for interlace handling, but we also
-    * call png_read_update_info therefore must turn on interlace handling now:
-    */
-   (void)png_set_interlace_handling(png_ptr);
-
-   /* Optional call to gamma correct and add the background to the palette
-    * and update info structure.  REQUIRED if you are expecting libpng to
-    * update the palette for you (i.e., you selected such a transform above).
-    */
-   png_read_update_info(png_ptr, info_ptr);
-
-   /* -------------- image transformations end here ------------------- */
-
-   png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
-   if (info_ptr->row_pointers == NULL)
-   {
-      png_uint_32 iptr;
-
-      info_ptr->row_pointers = png_voidcast(png_bytepp, png_malloc(png_ptr,
-          info_ptr->height * (sizeof (png_bytep))));
-
-      for (iptr=0; iptr<info_ptr->height; iptr++)
-         info_ptr->row_pointers[iptr] = NULL;
-
-      info_ptr->free_me |= PNG_FREE_ROWS;
-
-      for (iptr = 0; iptr < info_ptr->height; iptr++)
-         info_ptr->row_pointers[iptr] = png_voidcast(png_bytep,
-             png_malloc(png_ptr, info_ptr->rowbytes));
-   }
-
-   png_read_image(png_ptr, info_ptr->row_pointers);
-   info_ptr->valid |= PNG_INFO_IDAT;
-
-   /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
-   png_read_end(png_ptr, info_ptr);
-
-   PNG_UNUSED(params)
-}
-#endif /* INFO_IMAGE */
-#endif /* SEQUENTIAL_READ */
-
-#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
-/* SIMPLIFIED READ
- *
- * This code currently relies on the sequential reader, though it could easily
- * be made to work with the progressive one.
- */
-/* Arguments to png_image_finish_read: */
-
-/* Encoding of PNG data (used by the color-map code) */
-#  define P_NOTSET  0 /* File encoding not yet known */
-#  define P_sRGB    1 /* 8-bit encoded to sRGB gamma */
-#  define P_LINEAR  2 /* 16-bit linear: not encoded, NOT pre-multiplied! */
-#  define P_FILE    3 /* 8-bit encoded to file gamma, not sRGB or linear */
-#  define P_LINEAR8 4 /* 8-bit linear: only from a file value */
-
-/* Color-map processing: after libpng has run on the PNG image further
- * processing may be needed to convert the data to color-map indices.
- */
-#define PNG_CMAP_NONE      0
-#define PNG_CMAP_GA        1 /* Process GA data to a color-map with alpha */
-#define PNG_CMAP_TRANS     2 /* Process GA data to a background index */
-#define PNG_CMAP_RGB       3 /* Process RGB data */
-#define PNG_CMAP_RGB_ALPHA 4 /* Process RGBA data */
-
-/* The following document where the background is for each processing case. */
-#define PNG_CMAP_NONE_BACKGROUND      256
-#define PNG_CMAP_GA_BACKGROUND        231
-#define PNG_CMAP_TRANS_BACKGROUND     254
-#define PNG_CMAP_RGB_BACKGROUND       256
-#define PNG_CMAP_RGB_ALPHA_BACKGROUND 216
-
-typedef struct
-{
-   /* Arguments: */
-   png_imagep image;
-   png_voidp  buffer;
-   png_int_32 row_stride;
-   png_voidp  colormap;
-   png_const_colorp background;
-   /* Local variables: */
-   png_voidp       local_row;
-   png_voidp       first_row;
-   ptrdiff_t       row_bytes;           /* step between rows */
-   int             file_encoding;       /* E_ values above */
-   png_fixed_point gamma_to_linear;     /* For P_FILE, reciprocal of gamma */
-   int             colormap_processing; /* PNG_CMAP_ values above */
-} png_image_read_control;
-
-/* Do all the *safe* initialization - 'safe' means that png_error won't be
- * called, so setting up the jmp_buf is not required.  This means that anything
- * called from here must *not* call png_malloc - it has to call png_malloc_warn
- * instead so that control is returned safely back to this routine.
- */
-static int
-png_image_read_init(png_imagep image)
-{
-   if (image->opaque == NULL)
-   {
-      png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, image,
-          png_safe_error, png_safe_warning);
-
-      /* And set the rest of the structure to NULL to ensure that the various
-       * fields are consistent.
-       */
-      memset(image, 0, (sizeof *image));
-      image->version = PNG_IMAGE_VERSION;
-
-      if (png_ptr != NULL)
-      {
-         png_infop info_ptr = png_create_info_struct(png_ptr);
-
-         if (info_ptr != NULL)
-         {
-            png_controlp control = png_voidcast(png_controlp,
-                png_malloc_warn(png_ptr, (sizeof *control)));
-
-            if (control != NULL)
-            {
-               memset(control, 0, (sizeof *control));
-
-               control->png_ptr = png_ptr;
-               control->info_ptr = info_ptr;
-               control->for_write = 0;
-
-               image->opaque = control;
-               return 1;
-            }
-
-            /* Error clean up */
-            png_destroy_info_struct(png_ptr, &info_ptr);
-         }
-
-         png_destroy_read_struct(&png_ptr, NULL, NULL);
-      }
-
-      return png_image_error(image, "png_image_read: out of memory");
-   }
-
-   return png_image_error(image, "png_image_read: opaque pointer not NULL");
-}
-
-/* Utility to find the base format of a PNG file from a png_struct. */
-static png_uint_32
-png_image_format(png_structrp png_ptr)
-{
-   png_uint_32 format = 0;
-
-   if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
-      format |= PNG_FORMAT_FLAG_COLOR;
-
-   if ((png_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)
-      format |= PNG_FORMAT_FLAG_ALPHA;
-
-   /* Use png_ptr here, not info_ptr, because by examination png_handle_tRNS
-    * sets the png_struct fields; that's all we are interested in here.  The
-    * precise interaction with an app call to png_set_tRNS and PNG file reading
-    * is unclear.
-    */
-   else if (png_ptr->num_trans > 0)
-      format |= PNG_FORMAT_FLAG_ALPHA;
-
-   if (png_ptr->bit_depth == 16)
-      format |= PNG_FORMAT_FLAG_LINEAR;
-
-   if ((png_ptr->color_type & PNG_COLOR_MASK_PALETTE) != 0)
-      format |= PNG_FORMAT_FLAG_COLORMAP;
-
-   return format;
-}
-
-/* Is the given gamma significantly different from sRGB?  The test is the same
- * one used in pngrtran.c when deciding whether to do gamma correction.  The
- * arithmetic optimizes the division by using the fact that the inverse of the
- * file sRGB gamma is 2.2
- */
-static int
-png_gamma_not_sRGB(png_fixed_point g)
-{
-   if (g < PNG_FP_1)
-   {
-      /* An uninitialized gamma is assumed to be sRGB for the simplified API. */
-      if (g == 0)
-         return 0;
-
-      return png_gamma_significant((g * 11 + 2)/5 /* i.e. *2.2, rounded */);
-   }
-
-   return 1;
-}
-
-/* Do the main body of a 'png_image_begin_read' function; read the PNG file
- * header and fill in all the information.  This is executed in a safe context,
- * unlike the init routine above.
- */
-static int
-png_image_read_header(png_voidp argument)
-{
-   png_imagep image = png_voidcast(png_imagep, argument);
-   png_structrp png_ptr = image->opaque->png_ptr;
-   png_inforp info_ptr = image->opaque->info_ptr;
-
-#ifdef PNG_BENIGN_ERRORS_SUPPORTED
-   png_set_benign_errors(png_ptr, 1/*warn*/);
-#endif
-   png_read_info(png_ptr, info_ptr);
-
-   /* Do this the fast way; just read directly out of png_struct. */
-   image->width = png_ptr->width;
-   image->height = png_ptr->height;
-
-   {
-      png_uint_32 format = png_image_format(png_ptr);
-
-      image->format = format;
-
-#ifdef PNG_COLORSPACE_SUPPORTED
-      /* Does the colorspace match sRGB?  If there is no color endpoint
-       * (colorant) information assume yes, otherwise require the
-       * 'ENDPOINTS_MATCHP_sRGB' colorspace flag to have been set.  If the
-       * colorspace has been determined to be invalid ignore it.
-       */
-      if ((format & PNG_FORMAT_FLAG_COLOR) != 0 && ((png_ptr->colorspace.flags
-         & (PNG_COLORSPACE_HAVE_ENDPOINTS|PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB|
-            PNG_COLORSPACE_INVALID)) == PNG_COLORSPACE_HAVE_ENDPOINTS))
-         image->flags |= PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB;
-#endif
-   }
-
-   /* We need the maximum number of entries regardless of the format the
-    * application sets here.
-    */
-   {
-      png_uint_32 cmap_entries;
-
-      switch (png_ptr->color_type)
-      {
-         case PNG_COLOR_TYPE_GRAY:
-            cmap_entries = 1U << png_ptr->bit_depth;
-            break;
-
-         case PNG_COLOR_TYPE_PALETTE:
-            cmap_entries = (png_uint_32)png_ptr->num_palette;
-            break;
-
-         default:
-            cmap_entries = 256;
-            break;
-      }
-
-      if (cmap_entries > 256)
-         cmap_entries = 256;
-
-      image->colormap_entries = cmap_entries;
-   }
-
-   return 1;
-}
-
-#ifdef PNG_STDIO_SUPPORTED
-int PNGAPI
-png_image_begin_read_from_stdio(png_imagep image, FILE* file)
-{
-   if (image != NULL && image->version == PNG_IMAGE_VERSION)
-   {
-      if (file != NULL)
-      {
-         if (png_image_read_init(image) != 0)
-         {
-            /* This is slightly evil, but png_init_io doesn't do anything other
-             * than this and we haven't changed the standard IO functions so
-             * this saves a 'safe' function.
-             */
-            image->opaque->png_ptr->io_ptr = file;
-            return png_safe_execute(image, png_image_read_header, image);
-         }
-      }
-
-      else
-         return png_image_error(image,
-             "png_image_begin_read_from_stdio: invalid argument");
-   }
-
-   else if (image != NULL)
-      return png_image_error(image,
-          "png_image_begin_read_from_stdio: incorrect PNG_IMAGE_VERSION");
-
-   return 0;
-}
-
-int PNGAPI
-png_image_begin_read_from_file(png_imagep image, const char *file_name)
-{
-   if (image != NULL && image->version == PNG_IMAGE_VERSION)
-   {
-      if (file_name != NULL)
-      {
-         FILE *fp = fopen(file_name, "rb");
-
-         if (fp != NULL)
-         {
-            if (png_image_read_init(image) != 0)
-            {
-               image->opaque->png_ptr->io_ptr = fp;
-               image->opaque->owned_file = 1;
-               return png_safe_execute(image, png_image_read_header, image);
-            }
-
-            /* Clean up: just the opened file. */
-            (void)fclose(fp);
-         }
-
-         else
-            return png_image_error(image, strerror(errno));
-      }
-
-      else
-         return png_image_error(image,
-             "png_image_begin_read_from_file: invalid argument");
-   }
-
-   else if (image != NULL)
-      return png_image_error(image,
-          "png_image_begin_read_from_file: incorrect PNG_IMAGE_VERSION");
-
-   return 0;
-}
-#endif /* STDIO */
-
-static void PNGCBAPI
-png_image_memory_read(png_structp png_ptr, png_bytep out, png_size_t need)
-{
-   if (png_ptr != NULL)
-   {
-      png_imagep image = png_voidcast(png_imagep, png_ptr->io_ptr);
-      if (image != NULL)
-      {
-         png_controlp cp = image->opaque;
-         if (cp != NULL)
-         {
-            png_const_bytep memory = cp->memory;
-            png_size_t size = cp->size;
-
-            if (memory != NULL && size >= need)
-            {
-               memcpy(out, memory, need);
-               cp->memory = memory + need;
-               cp->size = size - need;
-               return;
-            }
-
-            png_error(png_ptr, "read beyond end of data");
-         }
-      }
-
-      png_error(png_ptr, "invalid memory read");
-   }
-}
-
-int PNGAPI png_image_begin_read_from_memory(png_imagep image,
-    png_const_voidp memory, png_size_t size)
-{
-   if (image != NULL && image->version == PNG_IMAGE_VERSION)
-   {
-      if (memory != NULL && size > 0)
-      {
-         if (png_image_read_init(image) != 0)
-         {
-            /* Now set the IO functions to read from the memory buffer and
-             * store it into io_ptr.  Again do this in-place to avoid calling a
-             * libpng function that requires error handling.
-             */
-            image->opaque->memory = png_voidcast(png_const_bytep, memory);
-            image->opaque->size = size;
-            image->opaque->png_ptr->io_ptr = image;
-            image->opaque->png_ptr->read_data_fn = png_image_memory_read;
-
-            return png_safe_execute(image, png_image_read_header, image);
-         }
-      }
-
-      else
-         return png_image_error(image,
-             "png_image_begin_read_from_memory: invalid argument");
-   }
-
-   else if (image != NULL)
-      return png_image_error(image,
-          "png_image_begin_read_from_memory: incorrect PNG_IMAGE_VERSION");
-
-   return 0;
-}
-
-/* Utility function to skip chunks that are not used by the simplified image
- * read functions and an appropriate macro to call it.
- */
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-static void
-png_image_skip_unused_chunks(png_structrp png_ptr)
-{
-   /* Prepare the reader to ignore all recognized chunks whose data will not
-    * be used, i.e., all chunks recognized by libpng except for those
-    * involved in basic image reading:
-    *
-    *    IHDR, PLTE, IDAT, IEND
-    *
-    * Or image data handling:
-    *
-    *    tRNS, bKGD, gAMA, cHRM, sRGB, [iCCP] and sBIT.
-    *
-    * This provides a small performance improvement and eliminates any
-    * potential vulnerability to security problems in the unused chunks.
-    *
-    * At present the iCCP chunk data isn't used, so iCCP chunk can be ignored
-    * too.  This allows the simplified API to be compiled without iCCP support,
-    * however if the support is there the chunk is still checked to detect
-    * errors (which are unfortunately quite common.)
-    */
-   {
-         static PNG_CONST png_byte chunks_to_process[] = {
-            98,  75,  71,  68, '\0',  /* bKGD */
-            99,  72,  82,  77, '\0',  /* cHRM */
-           103,  65,  77,  65, '\0',  /* gAMA */
-#        ifdef PNG_READ_iCCP_SUPPORTED
-           105,  67,  67,  80, '\0',  /* iCCP */
-#        endif
-           115,  66,  73,  84, '\0',  /* sBIT */
-           115,  82,  71,  66, '\0',  /* sRGB */
-           };
-
-       /* Ignore unknown chunks and all other chunks except for the
-        * IHDR, PLTE, tRNS, IDAT, and IEND chunks.
-        */
-       png_set_keep_unknown_chunks(png_ptr, PNG_HANDLE_CHUNK_NEVER,
-           NULL, -1);
-
-       /* But do not ignore image data handling chunks */
-       png_set_keep_unknown_chunks(png_ptr, PNG_HANDLE_CHUNK_AS_DEFAULT,
-           chunks_to_process, (int)/*SAFE*/(sizeof chunks_to_process)/5);
-   }
-}
-
-#  define PNG_SKIP_CHUNKS(p) png_image_skip_unused_chunks(p)
-#else
-#  define PNG_SKIP_CHUNKS(p) ((void)0)
-#endif /* HANDLE_AS_UNKNOWN */
-
-/* The following macro gives the exact rounded answer for all values in the
- * range 0..255 (it actually divides by 51.2, but the rounding still generates
- * the correct numbers 0..5
- */
-#define PNG_DIV51(v8) (((v8) * 5 + 130) >> 8)
-
-/* Utility functions to make particular color-maps */
-static void
-set_file_encoding(png_image_read_control *display)
-{
-   png_fixed_point g = display->image->opaque->png_ptr->colorspace.gamma;
-   if (png_gamma_significant(g) != 0)
-   {
-      if (png_gamma_not_sRGB(g) != 0)
-      {
-         display->file_encoding = P_FILE;
-         display->gamma_to_linear = png_reciprocal(g);
-      }
-
-      else
-         display->file_encoding = P_sRGB;
-   }
-
-   else
-      display->file_encoding = P_LINEAR8;
-}
-
-static unsigned int
-decode_gamma(png_image_read_control *display, png_uint_32 value, int encoding)
-{
-   if (encoding == P_FILE) /* double check */
-      encoding = display->file_encoding;
-
-   if (encoding == P_NOTSET) /* must be the file encoding */
-   {
-      set_file_encoding(display);
-      encoding = display->file_encoding;
-   }
-
-   switch (encoding)
-   {
-      case P_FILE:
-         value = png_gamma_16bit_correct(value*257, display->gamma_to_linear);
-         break;
-
-      case P_sRGB:
-         value = png_sRGB_table[value];
-         break;
-
-      case P_LINEAR:
-         break;
-
-      case P_LINEAR8:
-         value *= 257;
-         break;
-
-#ifdef __GNUC__
-      default:
-         png_error(display->image->opaque->png_ptr,
-             "unexpected encoding (internal error)");
-#endif
-   }
-
-   return value;
-}
-
-static png_uint_32
-png_colormap_compose(png_image_read_control *display,
-    png_uint_32 foreground, int foreground_encoding, png_uint_32 alpha,
-    png_uint_32 background, int encoding)
-{
-   /* The file value is composed on the background, the background has the given
-    * encoding and so does the result, the file is encoded with P_FILE and the
-    * file and alpha are 8-bit values.  The (output) encoding will always be
-    * P_LINEAR or P_sRGB.
-    */
-   png_uint_32 f = decode_gamma(display, foreground, foreground_encoding);
-   png_uint_32 b = decode_gamma(display, background, encoding);
-
-   /* The alpha is always an 8-bit value (it comes from the palette), the value
-    * scaled by 255 is what PNG_sRGB_FROM_LINEAR requires.
-    */
-   f = f * alpha + b * (255-alpha);
-
-   if (encoding == P_LINEAR)
-   {
-      /* Scale to 65535; divide by 255, approximately (in fact this is extremely
-       * accurate, it divides by 255.00000005937181414556, with no overflow.)
-       */
-      f *= 257; /* Now scaled by 65535 */
-      f += f >> 16;
-      f = (f+32768) >> 16;
-   }
-
-   else /* P_sRGB */
-      f = PNG_sRGB_FROM_LINEAR(f);
-
-   return f;
-}
-
-/* NOTE: P_LINEAR values to this routine must be 16-bit, but P_FILE values must
- * be 8-bit.
- */
-static void
-png_create_colormap_entry(png_image_read_control *display,
-    png_uint_32 ip, png_uint_32 red, png_uint_32 green, png_uint_32 blue,
-    png_uint_32 alpha, int encoding)
-{
-   png_imagep image = display->image;
-   const int output_encoding = (image->format & PNG_FORMAT_FLAG_LINEAR) != 0 ?
-       P_LINEAR : P_sRGB;
-   const int convert_to_Y = (image->format & PNG_FORMAT_FLAG_COLOR) == 0 &&
-       (red != green || green != blue);
-
-   if (ip > 255)
-      png_error(image->opaque->png_ptr, "color-map index out of range");
-
-   /* Update the cache with whether the file gamma is significantly different
-    * from sRGB.
-    */
-   if (encoding == P_FILE)
-   {
-      if (display->file_encoding == P_NOTSET)
-         set_file_encoding(display);
-
-      /* Note that the cached value may be P_FILE too, but if it is then the
-       * gamma_to_linear member has been set.
-       */
-      encoding = display->file_encoding;
-   }
-
-   if (encoding == P_FILE)
-   {
-      png_fixed_point g = display->gamma_to_linear;
-
-      red = png_gamma_16bit_correct(red*257, g);
-      green = png_gamma_16bit_correct(green*257, g);
-      blue = png_gamma_16bit_correct(blue*257, g);
-
-      if (convert_to_Y != 0 || output_encoding == P_LINEAR)
-      {
-         alpha *= 257;
-         encoding = P_LINEAR;
-      }
-
-      else
-      {
-         red = PNG_sRGB_FROM_LINEAR(red * 255);
-         green = PNG_sRGB_FROM_LINEAR(green * 255);
-         blue = PNG_sRGB_FROM_LINEAR(blue * 255);
-         encoding = P_sRGB;
-      }
-   }
-
-   else if (encoding == P_LINEAR8)
-   {
-      /* This encoding occurs quite frequently in test cases because PngSuite
-       * includes a gAMA 1.0 chunk with most images.
-       */
-      red *= 257;
-      green *= 257;
-      blue *= 257;
-      alpha *= 257;
-      encoding = P_LINEAR;
-   }
-
-   else if (encoding == P_sRGB &&
-       (convert_to_Y  != 0 || output_encoding == P_LINEAR))
-   {
-      /* The values are 8-bit sRGB values, but must be converted to 16-bit
-       * linear.
-       */
-      red = png_sRGB_table[red];
-      green = png_sRGB_table[green];
-      blue = png_sRGB_table[blue];
-      alpha *= 257;
-      encoding = P_LINEAR;
-   }
-
-   /* This is set if the color isn't gray but the output is. */
-   if (encoding == P_LINEAR)
-   {
-      if (convert_to_Y != 0)
-      {
-         /* NOTE: these values are copied from png_do_rgb_to_gray */
-         png_uint_32 y = (png_uint_32)6968 * red  + (png_uint_32)23434 * green +
-            (png_uint_32)2366 * blue;
-
-         if (output_encoding == P_LINEAR)
-            y = (y + 16384) >> 15;
-
-         else
-         {
-            /* y is scaled by 32768, we need it scaled by 255: */
-            y = (y + 128) >> 8;
-            y *= 255;
-            y = PNG_sRGB_FROM_LINEAR((y + 64) >> 7);
-            alpha = PNG_DIV257(alpha);
-            encoding = P_sRGB;
-         }
-
-         blue = red = green = y;
-      }
-
-      else if (output_encoding == P_sRGB)
-      {
-         red = PNG_sRGB_FROM_LINEAR(red * 255);
-         green = PNG_sRGB_FROM_LINEAR(green * 255);
-         blue = PNG_sRGB_FROM_LINEAR(blue * 255);
-         alpha = PNG_DIV257(alpha);
-         encoding = P_sRGB;
-      }
-   }
-
-   if (encoding != output_encoding)
-      png_error(image->opaque->png_ptr, "bad encoding (internal error)");
-
-   /* Store the value. */
-   {
-#     ifdef PNG_FORMAT_AFIRST_SUPPORTED
-         const int afirst = (image->format & PNG_FORMAT_FLAG_AFIRST) != 0 &&
-            (image->format & PNG_FORMAT_FLAG_ALPHA) != 0;
-#     else
-#        define afirst 0
-#     endif
-#     ifdef PNG_FORMAT_BGR_SUPPORTED
-         const int bgr = (image->format & PNG_FORMAT_FLAG_BGR) != 0 ? 2 : 0;
-#     else
-#        define bgr 0
-#     endif
-
-      if (output_encoding == P_LINEAR)
-      {
-         png_uint_16p entry = png_voidcast(png_uint_16p, display->colormap);
-
-         entry += ip * PNG_IMAGE_SAMPLE_CHANNELS(image->format);
-
-         /* The linear 16-bit values must be pre-multiplied by the alpha channel
-          * value, if less than 65535 (this is, effectively, composite on black
-          * if the alpha channel is removed.)
-          */
-         switch (PNG_IMAGE_SAMPLE_CHANNELS(image->format))
-         {
-            case 4:
-               entry[afirst ? 0 : 3] = (png_uint_16)alpha;
-               /* FALLTHROUGH */
-
-            case 3:
-               if (alpha < 65535)
-               {
-                  if (alpha > 0)
-                  {
-                     blue = (blue * alpha + 32767U)/65535U;
-                     green = (green * alpha + 32767U)/65535U;
-                     red = (red * alpha + 32767U)/65535U;
-                  }
-
-                  else
-                     red = green = blue = 0;
-               }
-               entry[afirst + (2 ^ bgr)] = (png_uint_16)blue;
-               entry[afirst + 1] = (png_uint_16)green;
-               entry[afirst + bgr] = (png_uint_16)red;
-               break;
-
-            case 2:
-               entry[1 ^ afirst] = (png_uint_16)alpha;
-               /* FALLTHROUGH */
-
-            case 1:
-               if (alpha < 65535)
-               {
-                  if (alpha > 0)
-                     green = (green * alpha + 32767U)/65535U;
-
-                  else
-                     green = 0;
-               }
-               entry[afirst] = (png_uint_16)green;
-               break;
-
-            default:
-               break;
-         }
-      }
-
-      else /* output encoding is P_sRGB */
-      {
-         png_bytep entry = png_voidcast(png_bytep, display->colormap);
-
-         entry += ip * PNG_IMAGE_SAMPLE_CHANNELS(image->format);
-
-         switch (PNG_IMAGE_SAMPLE_CHANNELS(image->format))
-         {
-            case 4:
-               entry[afirst ? 0 : 3] = (png_byte)alpha;
-               /* FALLTHROUGH */
-            case 3:
-               entry[afirst + (2 ^ bgr)] = (png_byte)blue;
-               entry[afirst + 1] = (png_byte)green;
-               entry[afirst + bgr] = (png_byte)red;
-               break;
-
-            case 2:
-               entry[1 ^ afirst] = (png_byte)alpha;
-               /* FALLTHROUGH */
-            case 1:
-               entry[afirst] = (png_byte)green;
-               break;
-
-            default:
-               break;
-         }
-      }
-
-#     ifdef afirst
-#        undef afirst
-#     endif
-#     ifdef bgr
-#        undef bgr
-#     endif
-   }
-}
-
-static int
-make_gray_file_colormap(png_image_read_control *display)
-{
-   unsigned int i;
-
-   for (i=0; i<256; ++i)
-      png_create_colormap_entry(display, i, i, i, i, 255, P_FILE);
-
-   return (int)i;
-}
-
-static int
-make_gray_colormap(png_image_read_control *display)
-{
-   unsigned int i;
-
-   for (i=0; i<256; ++i)
-      png_create_colormap_entry(display, i, i, i, i, 255, P_sRGB);
-
-   return (int)i;
-}
-#define PNG_GRAY_COLORMAP_ENTRIES 256
-
-static int
-make_ga_colormap(png_image_read_control *display)
-{
-   unsigned int i, a;
-
-   /* Alpha is retained, the output will be a color-map with entries
-    * selected by six levels of alpha.  One transparent entry, 6 gray
-    * levels for all the intermediate alpha values, leaving 230 entries
-    * for the opaque grays.  The color-map entries are the six values
-    * [0..5]*51, the GA processing uses PNG_DIV51(value) to find the
-    * relevant entry.
-    *
-    * if (alpha > 229) // opaque
-    * {
-    *    // The 231 entries are selected to make the math below work:
-    *    base = 0;
-    *    entry = (231 * gray + 128) >> 8;
-    * }
-    * else if (alpha < 26) // transparent
-    * {
-    *    base = 231;
-    *    entry = 0;
-    * }
-    * else // partially opaque
-    * {
-    *    base = 226 + 6 * PNG_DIV51(alpha);
-    *    entry = PNG_DIV51(gray);
-    * }
-    */
-   i = 0;
-   while (i < 231)
-   {
-      unsigned int gray = (i * 256 + 115) / 231;
-      png_create_colormap_entry(display, i++, gray, gray, gray, 255, P_sRGB);
-   }
-
-   /* 255 is used here for the component values for consistency with the code
-    * that undoes premultiplication in pngwrite.c.
-    */
-   png_create_colormap_entry(display, i++, 255, 255, 255, 0, P_sRGB);
-
-   for (a=1; a<5; ++a)
-   {
-      unsigned int g;
-
-      for (g=0; g<6; ++g)
-         png_create_colormap_entry(display, i++, g*51, g*51, g*51, a*51,
-             P_sRGB);
-   }
-
-   return (int)i;
-}
-
-#define PNG_GA_COLORMAP_ENTRIES 256
-
-static int
-make_rgb_colormap(png_image_read_control *display)
-{
-   unsigned int i, r;
-
-   /* Build a 6x6x6 opaque RGB cube */
-   for (i=r=0; r<6; ++r)
-   {
-      unsigned int g;
-
-      for (g=0; g<6; ++g)
-      {
-         unsigned int b;
-
-         for (b=0; b<6; ++b)
-            png_create_colormap_entry(display, i++, r*51, g*51, b*51, 255,
-                P_sRGB);
-      }
-   }
-
-   return (int)i;
-}
-
-#define PNG_RGB_COLORMAP_ENTRIES 216
-
-/* Return a palette index to the above palette given three 8-bit sRGB values. */
-#define PNG_RGB_INDEX(r,g,b) \
-   ((png_byte)(6 * (6 * PNG_DIV51(r) + PNG_DIV51(g)) + PNG_DIV51(b)))
-
-static int
-png_image_read_colormap(png_voidp argument)
-{
-   png_image_read_control *display =
-      png_voidcast(png_image_read_control*, argument);
-   const png_imagep image = display->image;
-
-   const png_structrp png_ptr = image->opaque->png_ptr;
-   const png_uint_32 output_format = image->format;
-   const int output_encoding = (output_format & PNG_FORMAT_FLAG_LINEAR) != 0 ?
-      P_LINEAR : P_sRGB;
-
-   unsigned int cmap_entries;
-   unsigned int output_processing;        /* Output processing option */
-   unsigned int data_encoding = P_NOTSET; /* Encoding libpng must produce */
-
-   /* Background information; the background color and the index of this color
-    * in the color-map if it exists (else 256).
-    */
-   unsigned int background_index = 256;
-   png_uint_32 back_r, back_g, back_b;
-
-   /* Flags to accumulate things that need to be done to the input. */
-   int expand_tRNS = 0;
-
-   /* Exclude the NYI feature of compositing onto a color-mapped buffer; it is
-    * very difficult to do, the results look awful, and it is difficult to see
-    * what possible use it is because the application can't control the
-    * color-map.
-    */
-   if (((png_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0 ||
-         png_ptr->num_trans > 0) /* alpha in input */ &&
-      ((output_format & PNG_FORMAT_FLAG_ALPHA) == 0) /* no alpha in output */)
-   {
-      if (output_encoding == P_LINEAR) /* compose on black */
-         back_b = back_g = back_r = 0;
-
-      else if (display->background == NULL /* no way to remove it */)
-         png_error(png_ptr,
-             "background color must be supplied to remove alpha/transparency");
-
-      /* Get a copy of the background color (this avoids repeating the checks
-       * below.)  The encoding is 8-bit sRGB or 16-bit linear, depending on the
-       * output format.
-       */
-      else
-      {
-         back_g = display->background->green;
-         if ((output_format & PNG_FORMAT_FLAG_COLOR) != 0)
-         {
-            back_r = display->background->red;
-            back_b = display->background->blue;
-         }
-         else
-            back_b = back_r = back_g;
-      }
-   }
-
-   else if (output_encoding == P_LINEAR)
-      back_b = back_r = back_g = 65535;
-
-   else
-      back_b = back_r = back_g = 255;
-
-   /* Default the input file gamma if required - this is necessary because
-    * libpng assumes that if no gamma information is present the data is in the
-    * output format, but the simplified API deduces the gamma from the input
-    * format.
-    */
-   if ((png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) == 0)
-   {
-      /* Do this directly, not using the png_colorspace functions, to ensure
-       * that it happens even if the colorspace is invalid (though probably if
-       * it is the setting will be ignored)  Note that the same thing can be
-       * achieved at the application interface with png_set_gAMA.
-       */
-      if (png_ptr->bit_depth == 16 &&
-         (image->flags & PNG_IMAGE_FLAG_16BIT_sRGB) == 0)
-         png_ptr->colorspace.gamma = PNG_GAMMA_LINEAR;
-
-      else
-         png_ptr->colorspace.gamma = PNG_GAMMA_sRGB_INVERSE;
-
-      png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA;
-   }
-
-   /* Decide what to do based on the PNG color type of the input data.  The
-    * utility function png_create_colormap_entry deals with most aspects of the
-    * output transformations; this code works out how to produce bytes of
-    * color-map entries from the original format.
-    */
-   switch (png_ptr->color_type)
-   {
-      case PNG_COLOR_TYPE_GRAY:
-         if (png_ptr->bit_depth <= 8)
-         {
-            /* There at most 256 colors in the output, regardless of
-             * transparency.
-             */
-            unsigned int step, i, val, trans = 256/*ignore*/, back_alpha = 0;
-
-            cmap_entries = 1U << png_ptr->bit_depth;
-            if (cmap_entries > image->colormap_entries)
-               png_error(png_ptr, "gray[8] color-map: too few entries");
-
-            step = 255 / (cmap_entries - 1);
-            output_processing = PNG_CMAP_NONE;
-
-            /* If there is a tRNS chunk then this either selects a transparent
-             * value or, if the output has no alpha, the background color.
-             */
-            if (png_ptr->num_trans > 0)
-            {
-               trans = png_ptr->trans_color.gray;
-
-               if ((output_format & PNG_FORMAT_FLAG_ALPHA) == 0)
-                  back_alpha = output_encoding == P_LINEAR ? 65535 : 255;
-            }
-
-            /* png_create_colormap_entry just takes an RGBA and writes the
-             * corresponding color-map entry using the format from 'image',
-             * including the required conversion to sRGB or linear as
-             * appropriate.  The input values are always either sRGB (if the
-             * gamma correction flag is 0) or 0..255 scaled file encoded values
-             * (if the function must gamma correct them).
-             */
-            for (i=val=0; i<cmap_entries; ++i, val += step)
-            {
-               /* 'i' is a file value.  While this will result in duplicated
-                * entries for 8-bit non-sRGB encoded files it is necessary to
-                * have non-gamma corrected values to do tRNS handling.
-                */
-               if (i != trans)
-                  png_create_colormap_entry(display, i, val, val, val, 255,
-                      P_FILE/*8-bit with file gamma*/);
-
-               /* Else this entry is transparent.  The colors don't matter if
-                * there is an alpha channel (back_alpha == 0), but it does no
-                * harm to pass them in; the values are not set above so this
-                * passes in white.
-                *
-                * NOTE: this preserves the full precision of the application
-                * supplied background color when it is used.
-                */
-               else
-                  png_create_colormap_entry(display, i, back_r, back_g, back_b,
-                      back_alpha, output_encoding);
-            }
-
-            /* We need libpng to preserve the original encoding. */
-            data_encoding = P_FILE;
-
-            /* The rows from libpng, while technically gray values, are now also
-             * color-map indices; however, they may need to be expanded to 1
-             * byte per pixel.  This is what png_set_packing does (i.e., it
-             * unpacks the bit values into bytes.)
-             */
-            if (png_ptr->bit_depth < 8)
-               png_set_packing(png_ptr);
-         }
-
-         else /* bit depth is 16 */
-         {
-            /* The 16-bit input values can be converted directly to 8-bit gamma
-             * encoded values; however, if a tRNS chunk is present 257 color-map
-             * entries are required.  This means that the extra entry requires
-             * special processing; add an alpha channel, sacrifice gray level
-             * 254 and convert transparent (alpha==0) entries to that.
-             *
-             * Use libpng to chop the data to 8 bits.  Convert it to sRGB at the
-             * same time to minimize quality loss.  If a tRNS chunk is present
-             * this means libpng must handle it too; otherwise it is impossible
-             * to do the exact match on the 16-bit value.
-             *
-             * If the output has no alpha channel *and* the background color is
-             * gray then it is possible to let libpng handle the substitution by
-             * ensuring that the corresponding gray level matches the background
-             * color exactly.
-             */
-            data_encoding = P_sRGB;
-
-            if (PNG_GRAY_COLORMAP_ENTRIES > image->colormap_entries)
-               png_error(png_ptr, "gray[16] color-map: too few entries");
-
-            cmap_entries = (unsigned int)make_gray_colormap(display);
-
-            if (png_ptr->num_trans > 0)
-            {
-               unsigned int back_alpha;
-
-               if ((output_format & PNG_FORMAT_FLAG_ALPHA) != 0)
-                  back_alpha = 0;
-
-               else
-               {
-                  if (back_r == back_g && back_g == back_b)
-                  {
-                     /* Background is gray; no special processing will be
-                      * required.
-                      */
-                     png_color_16 c;
-                     png_uint_32 gray = back_g;
-
-                     if (output_encoding == P_LINEAR)
-                     {
-                        gray = PNG_sRGB_FROM_LINEAR(gray * 255);
-
-                        /* And make sure the corresponding palette entry
-                         * matches.
-                         */
-                        png_create_colormap_entry(display, gray, back_g, back_g,
-                            back_g, 65535, P_LINEAR);
-                     }
-
-                     /* The background passed to libpng, however, must be the
-                      * sRGB value.
-                      */
-                     c.index = 0; /*unused*/
-                     c.gray = c.red = c.green = c.blue = (png_uint_16)gray;
-
-                     /* NOTE: does this work without expanding tRNS to alpha?
-                      * It should be the color->gray case below apparently
-                      * doesn't.
-                      */
-                     png_set_background_fixed(png_ptr, &c,
-                         PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/,
-                         0/*gamma: not used*/);
-
-                     output_processing = PNG_CMAP_NONE;
-                     break;
-                  }
-#ifdef __COVERITY__
-                 /* Coverity claims that output_encoding cannot be 2 (P_LINEAR)
-                  * here.
-                  */
-                  back_alpha = 255;
-#else
-                  back_alpha = output_encoding == P_LINEAR ? 65535 : 255;
-#endif
-               }
-
-               /* output_processing means that the libpng-processed row will be
-                * 8-bit GA and it has to be processing to single byte color-map
-                * values.  Entry 254 is replaced by either a completely
-                * transparent entry or by the background color at full
-                * precision (and the background color is not a simple gray
-                * level in this case.)
-                */
-               expand_tRNS = 1;
-               output_processing = PNG_CMAP_TRANS;
-               background_index = 254;
-
-               /* And set (overwrite) color-map entry 254 to the actual
-                * background color at full precision.
-                */
-               png_create_colormap_entry(display, 254, back_r, back_g, back_b,
-                   back_alpha, output_encoding);
-            }
-
-            else
-               output_processing = PNG_CMAP_NONE;
-         }
-         break;
-
-      case PNG_COLOR_TYPE_GRAY_ALPHA:
-         /* 8-bit or 16-bit PNG with two channels - gray and alpha.  A minimum
-          * of 65536 combinations.  If, however, the alpha channel is to be
-          * removed there are only 256 possibilities if the background is gray.
-          * (Otherwise there is a subset of the 65536 possibilities defined by
-          * the triangle between black, white and the background color.)
-          *
-          * Reduce 16-bit files to 8-bit and sRGB encode the result.  No need to
-          * worry about tRNS matching - tRNS is ignored if there is an alpha
-          * channel.
-          */
-         data_encoding = P_sRGB;
-
-         if ((output_format & PNG_FORMAT_FLAG_ALPHA) != 0)
-         {
-            if (PNG_GA_COLORMAP_ENTRIES > image->colormap_entries)
-               png_error(png_ptr, "gray+alpha color-map: too few entries");
-
-            cmap_entries = (unsigned int)make_ga_colormap(display);
-
-            background_index = PNG_CMAP_GA_BACKGROUND;
-            output_processing = PNG_CMAP_GA;
-         }
-
-         else /* alpha is removed */
-         {
-            /* Alpha must be removed as the PNG data is processed when the
-             * background is a color because the G and A channels are
-             * independent and the vector addition (non-parallel vectors) is a
-             * 2-D problem.
-             *
-             * This can be reduced to the same algorithm as above by making a
-             * colormap containing gray levels (for the opaque grays), a
-             * background entry (for a transparent pixel) and a set of four six
-             * level color values, one set for each intermediate alpha value.
-             * See the comments in make_ga_colormap for how this works in the
-             * per-pixel processing.
-             *
-             * If the background is gray, however, we only need a 256 entry gray
-             * level color map.  It is sufficient to make the entry generated
-             * for the background color be exactly the color specified.
-             */
-            if ((output_format & PNG_FORMAT_FLAG_COLOR) == 0 ||
-               (back_r == back_g && back_g == back_b))
-            {
-               /* Background is gray; no special processing will be required. */
-               png_color_16 c;
-               png_uint_32 gray = back_g;
-
-               if (PNG_GRAY_COLORMAP_ENTRIES > image->colormap_entries)
-                  png_error(png_ptr, "gray-alpha color-map: too few entries");
-
-               cmap_entries = (unsigned int)make_gray_colormap(display);
-
-               if (output_encoding == P_LINEAR)
-               {
-                  gray = PNG_sRGB_FROM_LINEAR(gray * 255);
-
-                  /* And make sure the corresponding palette entry matches. */
-                  png_create_colormap_entry(display, gray, back_g, back_g,
-                      back_g, 65535, P_LINEAR);
-               }
-
-               /* The background passed to libpng, however, must be the sRGB
-                * value.
-                */
-               c.index = 0; /*unused*/
-               c.gray = c.red = c.green = c.blue = (png_uint_16)gray;
-
-               png_set_background_fixed(png_ptr, &c,
-                   PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/,
-                   0/*gamma: not used*/);
-
-               output_processing = PNG_CMAP_NONE;
-            }
-
-            else
-            {
-               png_uint_32 i, a;
-
-               /* This is the same as png_make_ga_colormap, above, except that
-                * the entries are all opaque.
-                */
-               if (PNG_GA_COLORMAP_ENTRIES > image->colormap_entries)
-                  png_error(png_ptr, "ga-alpha color-map: too few entries");
-
-               i = 0;
-               while (i < 231)
-               {
-                  png_uint_32 gray = (i * 256 + 115) / 231;
-                  png_create_colormap_entry(display, i++, gray, gray, gray,
-                      255, P_sRGB);
-               }
-
-               /* NOTE: this preserves the full precision of the application
-                * background color.
-                */
-               background_index = i;
-               png_create_colormap_entry(display, i++, back_r, back_g, back_b,
-#ifdef __COVERITY__
-                   /* Coverity claims that output_encoding
-                    * cannot be 2 (P_LINEAR) here.
-                    */ 255U,
-#else
-                    output_encoding == P_LINEAR ? 65535U : 255U,
-#endif
-                    output_encoding);
-
-               /* For non-opaque input composite on the sRGB background - this
-                * requires inverting the encoding for each component.  The input
-                * is still converted to the sRGB encoding because this is a
-                * reasonable approximate to the logarithmic curve of human
-                * visual sensitivity, at least over the narrow range which PNG
-                * represents.  Consequently 'G' is always sRGB encoded, while
-                * 'A' is linear.  We need the linear background colors.
-                */
-               if (output_encoding == P_sRGB) /* else already linear */
-               {
-                  /* This may produce a value not exactly matching the
-                   * background, but that's ok because these numbers are only
-                   * used when alpha != 0
-                   */
-                  back_r = png_sRGB_table[back_r];
-                  back_g = png_sRGB_table[back_g];
-                  back_b = png_sRGB_table[back_b];
-               }
-
-               for (a=1; a<5; ++a)
-               {
-                  unsigned int g;
-
-                  /* PNG_sRGB_FROM_LINEAR expects a 16-bit linear value scaled
-                   * by an 8-bit alpha value (0..255).
-                   */
-                  png_uint_32 alpha = 51 * a;
-                  png_uint_32 back_rx = (255-alpha) * back_r;
-                  png_uint_32 back_gx = (255-alpha) * back_g;
-                  png_uint_32 back_bx = (255-alpha) * back_b;
-
-                  for (g=0; g<6; ++g)
-                  {
-                     png_uint_32 gray = png_sRGB_table[g*51] * alpha;
-
-                     png_create_colormap_entry(display, i++,
-                         PNG_sRGB_FROM_LINEAR(gray + back_rx),
-                         PNG_sRGB_FROM_LINEAR(gray + back_gx),
-                         PNG_sRGB_FROM_LINEAR(gray + back_bx), 255, P_sRGB);
-                  }
-               }
-
-               cmap_entries = i;
-               output_processing = PNG_CMAP_GA;
-            }
-         }
-         break;
-
-      case PNG_COLOR_TYPE_RGB:
-      case PNG_COLOR_TYPE_RGB_ALPHA:
-         /* Exclude the case where the output is gray; we can always handle this
-          * with the cases above.
-          */
-         if ((output_format & PNG_FORMAT_FLAG_COLOR) == 0)
-         {
-            /* The color-map will be grayscale, so we may as well convert the
-             * input RGB values to a simple grayscale and use the grayscale
-             * code above.
-             *
-             * NOTE: calling this apparently damages the recognition of the
-             * transparent color in background color handling; call
-             * png_set_tRNS_to_alpha before png_set_background_fixed.
-             */
-            png_set_rgb_to_gray_fixed(png_ptr, PNG_ERROR_ACTION_NONE, -1,
-                -1);
-            data_encoding = P_sRGB;
-
-            /* The output will now be one or two 8-bit gray or gray+alpha
-             * channels.  The more complex case arises when the input has alpha.
-             */
-            if ((png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA ||
-               png_ptr->num_trans > 0) &&
-               (output_format & PNG_FORMAT_FLAG_ALPHA) != 0)
-            {
-               /* Both input and output have an alpha channel, so no background
-                * processing is required; just map the GA bytes to the right
-                * color-map entry.
-                */
-               expand_tRNS = 1;
-
-               if (PNG_GA_COLORMAP_ENTRIES > image->colormap_entries)
-                  png_error(png_ptr, "rgb[ga] color-map: too few entries");
-
-               cmap_entries = (unsigned int)make_ga_colormap(display);
-               background_index = PNG_CMAP_GA_BACKGROUND;
-               output_processing = PNG_CMAP_GA;
-            }
-
-            else
-            {
-               /* Either the input or the output has no alpha channel, so there
-                * will be no non-opaque pixels in the color-map; it will just be
-                * grayscale.
-                */
-               if (PNG_GRAY_COLORMAP_ENTRIES > image->colormap_entries)
-                  png_error(png_ptr, "rgb[gray] color-map: too few entries");
-
-               /* Ideally this code would use libpng to do the gamma correction,
-                * but if an input alpha channel is to be removed we will hit the
-                * libpng bug in gamma+compose+rgb-to-gray (the double gamma
-                * correction bug).  Fix this by dropping the gamma correction in
-                * this case and doing it in the palette; this will result in
-                * duplicate palette entries, but that's better than the
-                * alternative of double gamma correction.
-                */
-               if ((png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA ||
-                  png_ptr->num_trans > 0) &&
-                  png_gamma_not_sRGB(png_ptr->colorspace.gamma) != 0)
-               {
-                  cmap_entries = (unsigned int)make_gray_file_colormap(display);
-                  data_encoding = P_FILE;
-               }
-
-               else
-                  cmap_entries = (unsigned int)make_gray_colormap(display);
-
-               /* But if the input has alpha or transparency it must be removed
-                */
-               if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA ||
-                  png_ptr->num_trans > 0)
-               {
-                  png_color_16 c;
-                  png_uint_32 gray = back_g;
-
-                  /* We need to ensure that the application background exists in
-                   * the colormap and that completely transparent pixels map to
-                   * it.  Achieve this simply by ensuring that the entry
-                   * selected for the background really is the background color.
-                   */
-                  if (data_encoding == P_FILE) /* from the fixup above */
-                  {
-                     /* The app supplied a gray which is in output_encoding, we
-                      * need to convert it to a value of the input (P_FILE)
-                      * encoding then set this palette entry to the required
-                      * output encoding.
-                      */
-                     if (output_encoding == P_sRGB)
-                        gray = png_sRGB_table[gray]; /* now P_LINEAR */
-
-                     gray = PNG_DIV257(png_gamma_16bit_correct(gray,
-                         png_ptr->colorspace.gamma)); /* now P_FILE */
-
-                     /* And make sure the corresponding palette entry contains
-                      * exactly the required sRGB value.
-                      */
-                     png_create_colormap_entry(display, gray, back_g, back_g,
-                         back_g, 0/*unused*/, output_encoding);
-                  }
-
-                  else if (output_encoding == P_LINEAR)
-                  {
-                     gray = PNG_sRGB_FROM_LINEAR(gray * 255);
-
-                     /* And make sure the corresponding palette entry matches.
-                      */
-                     png_create_colormap_entry(display, gray, back_g, back_g,
-                        back_g, 0/*unused*/, P_LINEAR);
-                  }
-
-                  /* The background passed to libpng, however, must be the
-                   * output (normally sRGB) value.
-                   */
-                  c.index = 0; /*unused*/
-                  c.gray = c.red = c.green = c.blue = (png_uint_16)gray;
-
-                  /* NOTE: the following is apparently a bug in libpng. Without
-                   * it the transparent color recognition in
-                   * png_set_background_fixed seems to go wrong.
-                   */
-                  expand_tRNS = 1;
-                  png_set_background_fixed(png_ptr, &c,
-                      PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/,
-                      0/*gamma: not used*/);
-               }
-
-               output_processing = PNG_CMAP_NONE;
-            }
-         }
-
-         else /* output is color */
-         {
-            /* We could use png_quantize here so long as there is no transparent
-             * color or alpha; png_quantize ignores alpha.  Easier overall just
-             * to do it once and using PNG_DIV51 on the 6x6x6 reduced RGB cube.
-             * Consequently we always want libpng to produce sRGB data.
-             */
-            data_encoding = P_sRGB;
-
-            /* Is there any transparency or alpha? */
-            if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA ||
-               png_ptr->num_trans > 0)
-            {
-               /* Is there alpha in the output too?  If so all four channels are
-                * processed into a special RGB cube with alpha support.
-                */
-               if ((output_format & PNG_FORMAT_FLAG_ALPHA) != 0)
-               {
-                  png_uint_32 r;
-
-                  if (PNG_RGB_COLORMAP_ENTRIES+1+27 > image->colormap_entries)
-                     png_error(png_ptr, "rgb+alpha color-map: too few entries");
-
-                  cmap_entries = (unsigned int)make_rgb_colormap(display);
-
-                  /* Add a transparent entry. */
-                  png_create_colormap_entry(display, cmap_entries, 255, 255,
-                      255, 0, P_sRGB);
-
-                  /* This is stored as the background index for the processing
-                   * algorithm.
-                   */
-                  background_index = cmap_entries++;
-
-                  /* Add 27 r,g,b entries each with alpha 0.5. */
-                  for (r=0; r<256; r = (r << 1) | 0x7f)
-                  {
-                     png_uint_32 g;
-
-                     for (g=0; g<256; g = (g << 1) | 0x7f)
-                     {
-                        png_uint_32 b;
-
-                        /* This generates components with the values 0, 127 and
-                         * 255
-                         */
-                        for (b=0; b<256; b = (b << 1) | 0x7f)
-                           png_create_colormap_entry(display, cmap_entries++,
-                               r, g, b, 128, P_sRGB);
-                     }
-                  }
-
-                  expand_tRNS = 1;
-                  output_processing = PNG_CMAP_RGB_ALPHA;
-               }
-
-               else
-               {
-                  /* Alpha/transparency must be removed.  The background must
-                   * exist in the color map (achieved by setting adding it after
-                   * the 666 color-map).  If the standard processing code will
-                   * pick up this entry automatically that's all that is
-                   * required; libpng can be called to do the background
-                   * processing.
-                   */
-                  unsigned int sample_size =
-                     PNG_IMAGE_SAMPLE_SIZE(output_format);
-                  png_uint_32 r, g, b; /* sRGB background */
-
-                  if (PNG_RGB_COLORMAP_ENTRIES+1+27 > image->colormap_entries)
-                     png_error(png_ptr, "rgb-alpha color-map: too few entries");
-
-                  cmap_entries = (unsigned int)make_rgb_colormap(display);
-
-                  png_create_colormap_entry(display, cmap_entries, back_r,
-                      back_g, back_b, 0/*unused*/, output_encoding);
-
-                  if (output_encoding == P_LINEAR)
-                  {
-                     r = PNG_sRGB_FROM_LINEAR(back_r * 255);
-                     g = PNG_sRGB_FROM_LINEAR(back_g * 255);
-                     b = PNG_sRGB_FROM_LINEAR(back_b * 255);
-                  }
-
-                  else
-                  {
-                     r = back_r;
-                     g = back_g;
-                     b = back_g;
-                  }
-
-                  /* Compare the newly-created color-map entry with the one the
-                   * PNG_CMAP_RGB algorithm will use.  If the two entries don't
-                   * match, add the new one and set this as the background
-                   * index.
-                   */
-                  if (memcmp((png_const_bytep)display->colormap +
-                      sample_size * cmap_entries,
-                      (png_const_bytep)display->colormap +
-                          sample_size * PNG_RGB_INDEX(r,g,b),
-                     sample_size) != 0)
-                  {
-                     /* The background color must be added. */
-                     background_index = cmap_entries++;
-
-                     /* Add 27 r,g,b entries each with created by composing with
-                      * the background at alpha 0.5.
-                      */
-                     for (r=0; r<256; r = (r << 1) | 0x7f)
-                     {
-                        for (g=0; g<256; g = (g << 1) | 0x7f)
-                        {
-                           /* This generates components with the values 0, 127
-                            * and 255
-                            */
-                           for (b=0; b<256; b = (b << 1) | 0x7f)
-                              png_create_colormap_entry(display, cmap_entries++,
-                                  png_colormap_compose(display, r, P_sRGB, 128,
-                                      back_r, output_encoding),
-                                  png_colormap_compose(display, g, P_sRGB, 128,
-                                      back_g, output_encoding),
-                                  png_colormap_compose(display, b, P_sRGB, 128,
-                                      back_b, output_encoding),
-                                  0/*unused*/, output_encoding);
-                        }
-                     }
-
-                     expand_tRNS = 1;
-                     output_processing = PNG_CMAP_RGB_ALPHA;
-                  }
-
-                  else /* background color is in the standard color-map */
-                  {
-                     png_color_16 c;
-
-                     c.index = 0; /*unused*/
-                     c.red = (png_uint_16)back_r;
-                     c.gray = c.green = (png_uint_16)back_g;
-                     c.blue = (png_uint_16)back_b;
-
-                     png_set_background_fixed(png_ptr, &c,
-                         PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/,
-                         0/*gamma: not used*/);
-
-                     output_processing = PNG_CMAP_RGB;
-                  }
-               }
-            }
-
-            else /* no alpha or transparency in the input */
-            {
-               /* Alpha in the output is irrelevant, simply map the opaque input
-                * pixels to the 6x6x6 color-map.
-                */
-               if (PNG_RGB_COLORMAP_ENTRIES > image->colormap_entries)
-                  png_error(png_ptr, "rgb color-map: too few entries");
-
-               cmap_entries = (unsigned int)make_rgb_colormap(display);
-               output_processing = PNG_CMAP_RGB;
-            }
-         }
-         break;
-
-      case PNG_COLOR_TYPE_PALETTE:
-         /* It's already got a color-map.  It may be necessary to eliminate the
-          * tRNS entries though.
-          */
-         {
-            unsigned int num_trans = png_ptr->num_trans;
-            png_const_bytep trans = num_trans > 0 ? png_ptr->trans_alpha : NULL;
-            png_const_colorp colormap = png_ptr->palette;
-            const int do_background = trans != NULL &&
-               (output_format & PNG_FORMAT_FLAG_ALPHA) == 0;
-            unsigned int i;
-
-            /* Just in case: */
-            if (trans == NULL)
-               num_trans = 0;
-
-            output_processing = PNG_CMAP_NONE;
-            data_encoding = P_FILE; /* Don't change from color-map indices */
-            cmap_entries = (unsigned int)png_ptr->num_palette;
-            if (cmap_entries > 256)
-               cmap_entries = 256;
-
-            if (cmap_entries > (unsigned int)image->colormap_entries)
-               png_error(png_ptr, "palette color-map: too few entries");
-
-            for (i=0; i < cmap_entries; ++i)
-            {
-               if (do_background != 0 && i < num_trans && trans[i] < 255)
-               {
-                  if (trans[i] == 0)
-                     png_create_colormap_entry(display, i, back_r, back_g,
-                         back_b, 0, output_encoding);
-
-                  else
-                  {
-                     /* Must compose the PNG file color in the color-map entry
-                      * on the sRGB color in 'back'.
-                      */
-                     png_create_colormap_entry(display, i,
-                         png_colormap_compose(display, colormap[i].red,
-                             P_FILE, trans[i], back_r, output_encoding),
-                         png_colormap_compose(display, colormap[i].green,
-                             P_FILE, trans[i], back_g, output_encoding),
-                         png_colormap_compose(display, colormap[i].blue,
-                             P_FILE, trans[i], back_b, output_encoding),
-                         output_encoding == P_LINEAR ? trans[i] * 257U :
-                             trans[i],
-                         output_encoding);
-                  }
-               }
-
-               else
-                  png_create_colormap_entry(display, i, colormap[i].red,
-                      colormap[i].green, colormap[i].blue,
-                      i < num_trans ? trans[i] : 255U, P_FILE/*8-bit*/);
-            }
-
-            /* The PNG data may have indices packed in fewer than 8 bits, it
-             * must be expanded if so.
-             */
-            if (png_ptr->bit_depth < 8)
-               png_set_packing(png_ptr);
-         }
-         break;
-
-      default:
-         png_error(png_ptr, "invalid PNG color type");
-         /*NOT REACHED*/
-   }
-
-   /* Now deal with the output processing */
-   if (expand_tRNS != 0 && png_ptr->num_trans > 0 &&
-       (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) == 0)
-      png_set_tRNS_to_alpha(png_ptr);
-
-   switch (data_encoding)
-   {
-      case P_sRGB:
-         /* Change to 8-bit sRGB */
-         png_set_alpha_mode_fixed(png_ptr, PNG_ALPHA_PNG, PNG_GAMMA_sRGB);
-         /* FALLTHROUGH */
-
-      case P_FILE:
-         if (png_ptr->bit_depth > 8)
-            png_set_scale_16(png_ptr);
-         break;
-
-#ifdef __GNUC__
-      default:
-         png_error(png_ptr, "bad data option (internal error)");
-#endif
-   }
-
-   if (cmap_entries > 256 || cmap_entries > image->colormap_entries)
-      png_error(png_ptr, "color map overflow (BAD internal error)");
-
-   image->colormap_entries = cmap_entries;
-
-   /* Double check using the recorded background index */
-   switch (output_processing)
-   {
-      case PNG_CMAP_NONE:
-         if (background_index != PNG_CMAP_NONE_BACKGROUND)
-            goto bad_background;
-         break;
-
-      case PNG_CMAP_GA:
-         if (background_index != PNG_CMAP_GA_BACKGROUND)
-            goto bad_background;
-         break;
-
-      case PNG_CMAP_TRANS:
-         if (background_index >= cmap_entries ||
-            background_index != PNG_CMAP_TRANS_BACKGROUND)
-            goto bad_background;
-         break;
-
-      case PNG_CMAP_RGB:
-         if (background_index != PNG_CMAP_RGB_BACKGROUND)
-            goto bad_background;
-         break;
-
-      case PNG_CMAP_RGB_ALPHA:
-         if (background_index != PNG_CMAP_RGB_ALPHA_BACKGROUND)
-            goto bad_background;
-         break;
-
-      default:
-         png_error(png_ptr, "bad processing option (internal error)");
-
-      bad_background:
-         png_error(png_ptr, "bad background index (internal error)");
-   }
-
-   display->colormap_processing = (int)output_processing;
-
-   return 1/*ok*/;
-}
-
-/* The final part of the color-map read called from png_image_finish_read. */
-static int
-png_image_read_and_map(png_voidp argument)
-{
-   png_image_read_control *display = png_voidcast(png_image_read_control*,
-       argument);
-   png_imagep image = display->image;
-   png_structrp png_ptr = image->opaque->png_ptr;
-   int passes;
-
-   /* Called when the libpng data must be transformed into the color-mapped
-    * form.  There is a local row buffer in display->local and this routine must
-    * do the interlace handling.
-    */
-   switch (png_ptr->interlaced)
-   {
-      case PNG_INTERLACE_NONE:
-         passes = 1;
-         break;
-
-      case PNG_INTERLACE_ADAM7:
-         passes = PNG_INTERLACE_ADAM7_PASSES;
-         break;
-
-      default:
-         png_error(png_ptr, "unknown interlace type");
-   }
-
-   {
-      png_uint_32  height = image->height;
-      png_uint_32  width = image->width;
-      int          proc = display->colormap_processing;
-      png_bytep    first_row = png_voidcast(png_bytep, display->first_row);
-      ptrdiff_t    step_row = display->row_bytes;
-      int pass;
-
-      for (pass = 0; pass < passes; ++pass)
-      {
-         unsigned int     startx, stepx, stepy;
-         png_uint_32      y;
-
-         if (png_ptr->interlaced == PNG_INTERLACE_ADAM7)
-         {
-            /* The row may be empty for a short image: */
-            if (PNG_PASS_COLS(width, pass) == 0)
-               continue;
-
-            startx = PNG_PASS_START_COL(pass);
-            stepx = PNG_PASS_COL_OFFSET(pass);
-            y = PNG_PASS_START_ROW(pass);
-            stepy = PNG_PASS_ROW_OFFSET(pass);
-         }
-
-         else
-         {
-            y = 0;
-            startx = 0;
-            stepx = stepy = 1;
-         }
-
-         for (; y<height; y += stepy)
-         {
-            png_bytep inrow = png_voidcast(png_bytep, display->local_row);
-            png_bytep outrow = first_row + y * step_row;
-            png_const_bytep end_row = outrow + width;
-
-            /* Read read the libpng data into the temporary buffer. */
-            png_read_row(png_ptr, inrow, NULL);
-
-            /* Now process the row according to the processing option, note
-             * that the caller verifies that the format of the libpng output
-             * data is as required.
-             */
-            outrow += startx;
-            switch (proc)
-            {
-               case PNG_CMAP_GA:
-                  for (; outrow < end_row; outrow += stepx)
-                  {
-                     /* The data is always in the PNG order */
-                     unsigned int gray = *inrow++;
-                     unsigned int alpha = *inrow++;
-                     unsigned int entry;
-
-                     /* NOTE: this code is copied as a comment in
-                      * make_ga_colormap above.  Please update the
-                      * comment if you change this code!
-                      */
-                     if (alpha > 229) /* opaque */
-                     {
-                        entry = (231 * gray + 128) >> 8;
-                     }
-                     else if (alpha < 26) /* transparent */
-                     {
-                        entry = 231;
-                     }
-                     else /* partially opaque */
-                     {
-                        entry = 226 + 6 * PNG_DIV51(alpha) + PNG_DIV51(gray);
-                     }
-
-                     *outrow = (png_byte)entry;
-                  }
-                  break;
-
-               case PNG_CMAP_TRANS:
-                  for (; outrow < end_row; outrow += stepx)
-                  {
-                     png_byte gray = *inrow++;
-                     png_byte alpha = *inrow++;
-
-                     if (alpha == 0)
-                        *outrow = PNG_CMAP_TRANS_BACKGROUND;
-
-                     else if (gray != PNG_CMAP_TRANS_BACKGROUND)
-                        *outrow = gray;
-
-                     else
-                        *outrow = (png_byte)(PNG_CMAP_TRANS_BACKGROUND+1);
-                  }
-                  break;
-
-               case PNG_CMAP_RGB:
-                  for (; outrow < end_row; outrow += stepx)
-                  {
-                     *outrow = PNG_RGB_INDEX(inrow[0], inrow[1], inrow[2]);
-                     inrow += 3;
-                  }
-                  break;
-
-               case PNG_CMAP_RGB_ALPHA:
-                  for (; outrow < end_row; outrow += stepx)
-                  {
-                     unsigned int alpha = inrow[3];
-
-                     /* Because the alpha entries only hold alpha==0.5 values
-                      * split the processing at alpha==0.25 (64) and 0.75
-                      * (196).
-                      */
-
-                     if (alpha >= 196)
-                        *outrow = PNG_RGB_INDEX(inrow[0], inrow[1],
-                            inrow[2]);
-
-                     else if (alpha < 64)
-                        *outrow = PNG_CMAP_RGB_ALPHA_BACKGROUND;
-
-                     else
-                     {
-                        /* Likewise there are three entries for each of r, g
-                         * and b.  We could select the entry by popcount on
-                         * the top two bits on those architectures that
-                         * support it, this is what the code below does,
-                         * crudely.
-                         */
-                        unsigned int back_i = PNG_CMAP_RGB_ALPHA_BACKGROUND+1;
-
-                        /* Here are how the values map:
-                         *
-                         * 0x00 .. 0x3f -> 0
-                         * 0x40 .. 0xbf -> 1
-                         * 0xc0 .. 0xff -> 2
-                         *
-                         * So, as above with the explicit alpha checks, the
-                         * breakpoints are at 64 and 196.
-                         */
-                        if (inrow[0] & 0x80) back_i += 9; /* red */
-                        if (inrow[0] & 0x40) back_i += 9;
-                        if (inrow[0] & 0x80) back_i += 3; /* green */
-                        if (inrow[0] & 0x40) back_i += 3;
-                        if (inrow[0] & 0x80) back_i += 1; /* blue */
-                        if (inrow[0] & 0x40) back_i += 1;
-
-                        *outrow = (png_byte)back_i;
-                     }
-
-                     inrow += 4;
-                  }
-                  break;
-
-               default:
-                  break;
-            }
-         }
-      }
-   }
-
-   return 1;
-}
-
-static int
-png_image_read_colormapped(png_voidp argument)
-{
-   png_image_read_control *display = png_voidcast(png_image_read_control*,
-       argument);
-   png_imagep image = display->image;
-   png_controlp control = image->opaque;
-   png_structrp png_ptr = control->png_ptr;
-   png_inforp info_ptr = control->info_ptr;
-
-   int passes = 0; /* As a flag */
-
-   PNG_SKIP_CHUNKS(png_ptr);
-
-   /* Update the 'info' structure and make sure the result is as required; first
-    * make sure to turn on the interlace handling if it will be required
-    * (because it can't be turned on *after* the call to png_read_update_info!)
-    */
-   if (display->colormap_processing == PNG_CMAP_NONE)
-      passes = png_set_interlace_handling(png_ptr);
-
-   png_read_update_info(png_ptr, info_ptr);
-
-   /* The expected output can be deduced from the colormap_processing option. */
-   switch (display->colormap_processing)
-   {
-      case PNG_CMAP_NONE:
-         /* Output must be one channel and one byte per pixel, the output
-          * encoding can be anything.
-          */
-         if ((info_ptr->color_type == PNG_COLOR_TYPE_PALETTE ||
-            info_ptr->color_type == PNG_COLOR_TYPE_GRAY) &&
-            info_ptr->bit_depth == 8)
-            break;
-
-         goto bad_output;
-
-      case PNG_CMAP_TRANS:
-      case PNG_CMAP_GA:
-         /* Output must be two channels and the 'G' one must be sRGB, the latter
-          * can be checked with an exact number because it should have been set
-          * to this number above!
-          */
-         if (info_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
-            info_ptr->bit_depth == 8 &&
-            png_ptr->screen_gamma == PNG_GAMMA_sRGB &&
-            image->colormap_entries == 256)
-            break;
-
-         goto bad_output;
-
-      case PNG_CMAP_RGB:
-         /* Output must be 8-bit sRGB encoded RGB */
-         if (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
-            info_ptr->bit_depth == 8 &&
-            png_ptr->screen_gamma == PNG_GAMMA_sRGB &&
-            image->colormap_entries == 216)
-            break;
-
-         goto bad_output;
-
-      case PNG_CMAP_RGB_ALPHA:
-         /* Output must be 8-bit sRGB encoded RGBA */
-         if (info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
-            info_ptr->bit_depth == 8 &&
-            png_ptr->screen_gamma == PNG_GAMMA_sRGB &&
-            image->colormap_entries == 244 /* 216 + 1 + 27 */)
-            break;
-
-         goto bad_output;
-
-      default:
-      bad_output:
-         png_error(png_ptr, "bad color-map processing (internal error)");
-   }
-
-   /* Now read the rows.  Do this here if it is possible to read directly into
-    * the output buffer, otherwise allocate a local row buffer of the maximum
-    * size libpng requires and call the relevant processing routine safely.
-    */
-   {
-      png_voidp first_row = display->buffer;
-      ptrdiff_t row_bytes = display->row_stride;
-
-      /* The following expression is designed to work correctly whether it gives
-       * a signed or an unsigned result.
-       */
-      if (row_bytes < 0)
-      {
-         char *ptr = png_voidcast(char*, first_row);
-         ptr += (image->height-1) * (-row_bytes);
-         first_row = png_voidcast(png_voidp, ptr);
-      }
-
-      display->first_row = first_row;
-      display->row_bytes = row_bytes;
-   }
-
-   if (passes == 0)
-   {
-      int result;
-      png_voidp row = png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr));
-
-      display->local_row = row;
-      result = png_safe_execute(image, png_image_read_and_map, display);
-      display->local_row = NULL;
-      png_free(png_ptr, row);
-
-      return result;
-   }
-
-   else
-   {
-      png_alloc_size_t row_bytes = (png_alloc_size_t)display->row_bytes;
-
-      while (--passes >= 0)
-      {
-         png_uint_32      y = image->height;
-         png_bytep        row = png_voidcast(png_bytep, display->first_row);
-
-         for (; y > 0; --y)
-         {
-            png_read_row(png_ptr, row, NULL);
-            row += row_bytes;
-         }
-      }
-
-      return 1;
-   }
-}
-
-/* Just the row reading part of png_image_read. */
-static int
-png_image_read_composite(png_voidp argument)
-{
-   png_image_read_control *display = png_voidcast(png_image_read_control*,
-       argument);
-   png_imagep image = display->image;
-   png_structrp png_ptr = image->opaque->png_ptr;
-   int passes;
-
-   switch (png_ptr->interlaced)
-   {
-      case PNG_INTERLACE_NONE:
-         passes = 1;
-         break;
-
-      case PNG_INTERLACE_ADAM7:
-         passes = PNG_INTERLACE_ADAM7_PASSES;
-         break;
-
-      default:
-         png_error(png_ptr, "unknown interlace type");
-   }
-
-   {
-      png_uint_32  height = image->height;
-      png_uint_32  width = image->width;
-      ptrdiff_t    step_row = display->row_bytes;
-      unsigned int channels =
-          (image->format & PNG_FORMAT_FLAG_COLOR) != 0 ? 3 : 1;
-      int pass;
-
-      for (pass = 0; pass < passes; ++pass)
-      {
-         unsigned int     startx, stepx, stepy;
-         png_uint_32      y;
-
-         if (png_ptr->interlaced == PNG_INTERLACE_ADAM7)
-         {
-            /* The row may be empty for a short image: */
-            if (PNG_PASS_COLS(width, pass) == 0)
-               continue;
-
-            startx = PNG_PASS_START_COL(pass) * channels;
-            stepx = PNG_PASS_COL_OFFSET(pass) * channels;
-            y = PNG_PASS_START_ROW(pass);
-            stepy = PNG_PASS_ROW_OFFSET(pass);
-         }
-
-         else
-         {
-            y = 0;
-            startx = 0;
-            stepx = channels;
-            stepy = 1;
-         }
-
-         for (; y<height; y += stepy)
-         {
-            png_bytep inrow = png_voidcast(png_bytep, display->local_row);
-            png_bytep outrow;
-            png_const_bytep end_row;
-
-            /* Read the row, which is packed: */
-            png_read_row(png_ptr, inrow, NULL);
-
-            outrow = png_voidcast(png_bytep, display->first_row);
-            outrow += y * step_row;
-            end_row = outrow + width * channels;
-
-            /* Now do the composition on each pixel in this row. */
-            outrow += startx;
-            for (; outrow < end_row; outrow += stepx)
-            {
-               png_byte alpha = inrow[channels];
-
-               if (alpha > 0) /* else no change to the output */
-               {
-                  unsigned int c;
-
-                  for (c=0; c<channels; ++c)
-                  {
-                     png_uint_32 component = inrow[c];
-
-                     if (alpha < 255) /* else just use component */
-                     {
-                        /* This is PNG_OPTIMIZED_ALPHA, the component value
-                         * is a linear 8-bit value.  Combine this with the
-                         * current outrow[c] value which is sRGB encoded.
-                         * Arithmetic here is 16-bits to preserve the output
-                         * values correctly.
-                         */
-                        component *= 257*255; /* =65535 */
-                        component += (255-alpha)*png_sRGB_table[outrow[c]];
-
-                        /* So 'component' is scaled by 255*65535 and is
-                         * therefore appropriate for the sRGB to linear
-                         * conversion table.
-                         */
-                        component = PNG_sRGB_FROM_LINEAR(component);
-                     }
-
-                     outrow[c] = (png_byte)component;
-                  }
-               }
-
-               inrow += channels+1; /* components and alpha channel */
-            }
-         }
-      }
-   }
-
-   return 1;
-}
-
-/* The do_local_background case; called when all the following transforms are to
- * be done:
- *
- * PNG_RGB_TO_GRAY
- * PNG_COMPOSITE
- * PNG_GAMMA
- *
- * This is a work-around for the fact that both the PNG_RGB_TO_GRAY and
- * PNG_COMPOSITE code performs gamma correction, so we get double gamma
- * correction.  The fix-up is to prevent the PNG_COMPOSITE operation from
- * happening inside libpng, so this routine sees an 8 or 16-bit gray+alpha
- * row and handles the removal or pre-multiplication of the alpha channel.
- */
-static int
-png_image_read_background(png_voidp argument)
-{
-   png_image_read_control *display = png_voidcast(png_image_read_control*,
-       argument);
-   png_imagep image = display->image;
-   png_structrp png_ptr = image->opaque->png_ptr;
-   png_inforp info_ptr = image->opaque->info_ptr;
-   png_uint_32 height = image->height;
-   png_uint_32 width = image->width;
-   int pass, passes;
-
-   /* Double check the convoluted logic below.  We expect to get here with
-    * libpng doing rgb to gray and gamma correction but background processing
-    * left to the png_image_read_background function.  The rows libpng produce
-    * might be 8 or 16-bit but should always have two channels; gray plus alpha.
-    */
-   if ((png_ptr->transformations & PNG_RGB_TO_GRAY) == 0)
-      png_error(png_ptr, "lost rgb to gray");
-
-   if ((png_ptr->transformations & PNG_COMPOSE) != 0)
-      png_error(png_ptr, "unexpected compose");
-
-   if (png_get_channels(png_ptr, info_ptr) != 2)
-      png_error(png_ptr, "lost/gained channels");
-
-   /* Expect the 8-bit case to always remove the alpha channel */
-   if ((image->format & PNG_FORMAT_FLAG_LINEAR) == 0 &&
-      (image->format & PNG_FORMAT_FLAG_ALPHA) != 0)
-      png_error(png_ptr, "unexpected 8-bit transformation");
-
-   switch (png_ptr->interlaced)
-   {
-      case PNG_INTERLACE_NONE:
-         passes = 1;
-         break;
-
-      case PNG_INTERLACE_ADAM7:
-         passes = PNG_INTERLACE_ADAM7_PASSES;
-         break;
-
-      default:
-         png_error(png_ptr, "unknown interlace type");
-   }
-
-   /* Use direct access to info_ptr here because otherwise the simplified API
-    * would require PNG_EASY_ACCESS_SUPPORTED (just for this.)  Note this is
-    * checking the value after libpng expansions, not the original value in the
-    * PNG.
-    */
-   switch (info_ptr->bit_depth)
-   {
-      case 8:
-         /* 8-bit sRGB gray values with an alpha channel; the alpha channel is
-          * to be removed by composing on a background: either the row if
-          * display->background is NULL or display->background->green if not.
-          * Unlike the code above ALPHA_OPTIMIZED has *not* been done.
-          */
-         {
-            png_bytep first_row = png_voidcast(png_bytep, display->first_row);
-            ptrdiff_t step_row = display->row_bytes;
-
-            for (pass = 0; pass < passes; ++pass)
-            {
-               png_bytep row = png_voidcast(png_bytep, display->first_row);
-               unsigned int     startx, stepx, stepy;
-               png_uint_32      y;
-
-               if (png_ptr->interlaced == PNG_INTERLACE_ADAM7)
-               {
-                  /* The row may be empty for a short image: */
-                  if (PNG_PASS_COLS(width, pass) == 0)
-                     continue;
-
-                  startx = PNG_PASS_START_COL(pass);
-                  stepx = PNG_PASS_COL_OFFSET(pass);
-                  y = PNG_PASS_START_ROW(pass);
-                  stepy = PNG_PASS_ROW_OFFSET(pass);
-               }
-
-               else
-               {
-                  y = 0;
-                  startx = 0;
-                  stepx = stepy = 1;
-               }
-
-               if (display->background == NULL)
-               {
-                  for (; y<height; y += stepy)
-                  {
-                     png_bytep inrow = png_voidcast(png_bytep,
-                         display->local_row);
-                     png_bytep outrow = first_row + y * step_row;
-                     png_const_bytep end_row = outrow + width;
-
-                     /* Read the row, which is packed: */
-                     png_read_row(png_ptr, inrow, NULL);
-
-                     /* Now do the composition on each pixel in this row. */
-                     outrow += startx;
-                     for (; outrow < end_row; outrow += stepx)
-                     {
-                        png_byte alpha = inrow[1];
-
-                        if (alpha > 0) /* else no change to the output */
-                        {
-                           png_uint_32 component = inrow[0];
-
-                           if (alpha < 255) /* else just use component */
-                           {
-                              /* Since PNG_OPTIMIZED_ALPHA was not set it is
-                               * necessary to invert the sRGB transfer
-                               * function and multiply the alpha out.
-                               */
-                              component = png_sRGB_table[component] * alpha;
-                              component += png_sRGB_table[outrow[0]] *
-                                 (255-alpha);
-                              component = PNG_sRGB_FROM_LINEAR(component);
-                           }
-
-                           outrow[0] = (png_byte)component;
-                        }
-
-                        inrow += 2; /* gray and alpha channel */
-                     }
-                  }
-               }
-
-               else /* constant background value */
-               {
-                  png_byte background8 = display->background->green;
-                  png_uint_16 background = png_sRGB_table[background8];
-
-                  for (; y<height; y += stepy)
-                  {
-                     png_bytep inrow = png_voidcast(png_bytep,
-                         display->local_row);
-                     png_bytep outrow = first_row + y * step_row;
-                     png_const_bytep end_row = outrow + width;
-
-                     /* Read the row, which is packed: */
-                     png_read_row(png_ptr, inrow, NULL);
-
-                     /* Now do the composition on each pixel in this row. */
-                     outrow += startx;
-                     for (; outrow < end_row; outrow += stepx)
-                     {
-                        png_byte alpha = inrow[1];
-
-                        if (alpha > 0) /* else use background */
-                        {
-                           png_uint_32 component = inrow[0];
-
-                           if (alpha < 255) /* else just use component */
-                           {
-                              component = png_sRGB_table[component] * alpha;
-                              component += background * (255-alpha);
-                              component = PNG_sRGB_FROM_LINEAR(component);
-                           }
-
-                           outrow[0] = (png_byte)component;
-                        }
-
-                        else
-                           outrow[0] = background8;
-
-                        inrow += 2; /* gray and alpha channel */
-                     }
-
-                     row += display->row_bytes;
-                  }
-               }
-            }
-         }
-         break;
-
-      case 16:
-         /* 16-bit linear with pre-multiplied alpha; the pre-multiplication must
-          * still be done and, maybe, the alpha channel removed.  This code also
-          * handles the alpha-first option.
-          */
-         {
-            png_uint_16p first_row = png_voidcast(png_uint_16p,
-                display->first_row);
-            /* The division by two is safe because the caller passed in a
-             * stride which was multiplied by 2 (below) to get row_bytes.
-             */
-            ptrdiff_t    step_row = display->row_bytes / 2;
-            unsigned int preserve_alpha = (image->format &
-                PNG_FORMAT_FLAG_ALPHA) != 0;
-            unsigned int outchannels = 1U+preserve_alpha;
-            int swap_alpha = 0;
-
-#           ifdef PNG_SIMPLIFIED_READ_AFIRST_SUPPORTED
-               if (preserve_alpha != 0 &&
-                   (image->format & PNG_FORMAT_FLAG_AFIRST) != 0)
-                  swap_alpha = 1;
-#           endif
-
-            for (pass = 0; pass < passes; ++pass)
-            {
-               unsigned int     startx, stepx, stepy;
-               png_uint_32      y;
-
-               /* The 'x' start and step are adjusted to output components here.
-                */
-               if (png_ptr->interlaced == PNG_INTERLACE_ADAM7)
-               {
-                  /* The row may be empty for a short image: */
-                  if (PNG_PASS_COLS(width, pass) == 0)
-                     continue;
-
-                  startx = PNG_PASS_START_COL(pass) * outchannels;
-                  stepx = PNG_PASS_COL_OFFSET(pass) * outchannels;
-                  y = PNG_PASS_START_ROW(pass);
-                  stepy = PNG_PASS_ROW_OFFSET(pass);
-               }
-
-               else
-               {
-                  y = 0;
-                  startx = 0;
-                  stepx = outchannels;
-                  stepy = 1;
-               }
-
-               for (; y<height; y += stepy)
-               {
-                  png_const_uint_16p inrow;
-                  png_uint_16p outrow = first_row + y*step_row;
-                  png_uint_16p end_row = outrow + width * outchannels;
-
-                  /* Read the row, which is packed: */
-                  png_read_row(png_ptr, png_voidcast(png_bytep,
-                      display->local_row), NULL);
-                  inrow = png_voidcast(png_const_uint_16p, display->local_row);
-
-                  /* Now do the pre-multiplication on each pixel in this row.
-                   */
-                  outrow += startx;
-                  for (; outrow < end_row; outrow += stepx)
-                  {
-                     png_uint_32 component = inrow[0];
-                     png_uint_16 alpha = inrow[1];
-
-                     if (alpha > 0) /* else 0 */
-                     {
-                        if (alpha < 65535) /* else just use component */
-                        {
-                           component *= alpha;
-                           component += 32767;
-                           component /= 65535;
-                        }
-                     }
-
-                     else
-                        component = 0;
-
-                     outrow[swap_alpha] = (png_uint_16)component;
-                     if (preserve_alpha != 0)
-                        outrow[1 ^ swap_alpha] = alpha;
-
-                     inrow += 2; /* components and alpha channel */
-                  }
-               }
-            }
-         }
-         break;
-
-#ifdef __GNUC__
-      default:
-         png_error(png_ptr, "unexpected bit depth");
-#endif
-   }
-
-   return 1;
-}
-
-/* The guts of png_image_finish_read as a png_safe_execute callback. */
-static int
-png_image_read_direct(png_voidp argument)
-{
-   png_image_read_control *display = png_voidcast(png_image_read_control*,
-       argument);
-   png_imagep image = display->image;
-   png_structrp png_ptr = image->opaque->png_ptr;
-   png_inforp info_ptr = image->opaque->info_ptr;
-
-   png_uint_32 format = image->format;
-   int linear = (format & PNG_FORMAT_FLAG_LINEAR) != 0;
-   int do_local_compose = 0;
-   int do_local_background = 0; /* to avoid double gamma correction bug */
-   int passes = 0;
-
-   /* Add transforms to ensure the correct output format is produced then check
-    * that the required implementation support is there.  Always expand; always
-    * need 8 bits minimum, no palette and expanded tRNS.
-    */
-   png_set_expand(png_ptr);
-
-   /* Now check the format to see if it was modified. */
-   {
-      png_uint_32 base_format = png_image_format(png_ptr) &
-         ~PNG_FORMAT_FLAG_COLORMAP /* removed by png_set_expand */;
-      png_uint_32 change = format ^ base_format;
-      png_fixed_point output_gamma;
-      int mode; /* alpha mode */
-
-      /* Do this first so that we have a record if rgb to gray is happening. */
-      if ((change & PNG_FORMAT_FLAG_COLOR) != 0)
-      {
-         /* gray<->color transformation required. */
-         if ((format & PNG_FORMAT_FLAG_COLOR) != 0)
-            png_set_gray_to_rgb(png_ptr);
-
-         else
-         {
-            /* libpng can't do both rgb to gray and
-             * background/pre-multiplication if there is also significant gamma
-             * correction, because both operations require linear colors and
-             * the code only supports one transform doing the gamma correction.
-             * Handle this by doing the pre-multiplication or background
-             * operation in this code, if necessary.
-             *
-             * TODO: fix this by rewriting pngrtran.c (!)
-             *
-             * For the moment (given that fixing this in pngrtran.c is an
-             * enormous change) 'do_local_background' is used to indicate that
-             * the problem exists.
-             */
-            if ((base_format & PNG_FORMAT_FLAG_ALPHA) != 0)
-               do_local_background = 1/*maybe*/;
-
-            png_set_rgb_to_gray_fixed(png_ptr, PNG_ERROR_ACTION_NONE,
-                PNG_RGB_TO_GRAY_DEFAULT, PNG_RGB_TO_GRAY_DEFAULT);
-         }
-
-         change &= ~PNG_FORMAT_FLAG_COLOR;
-      }
-
-      /* Set the gamma appropriately, linear for 16-bit input, sRGB otherwise.
-       */
-      {
-         png_fixed_point input_gamma_default;
-
-         if ((base_format & PNG_FORMAT_FLAG_LINEAR) != 0 &&
-             (image->flags & PNG_IMAGE_FLAG_16BIT_sRGB) == 0)
-            input_gamma_default = PNG_GAMMA_LINEAR;
-         else
-            input_gamma_default = PNG_DEFAULT_sRGB;
-
-         /* Call png_set_alpha_mode to set the default for the input gamma; the
-          * output gamma is set by a second call below.
-          */
-         png_set_alpha_mode_fixed(png_ptr, PNG_ALPHA_PNG, input_gamma_default);
-      }
-
-      if (linear != 0)
-      {
-         /* If there *is* an alpha channel in the input it must be multiplied
-          * out; use PNG_ALPHA_STANDARD, otherwise just use PNG_ALPHA_PNG.
-          */
-         if ((base_format & PNG_FORMAT_FLAG_ALPHA) != 0)
-            mode = PNG_ALPHA_STANDARD; /* associated alpha */
-
-         else
-            mode = PNG_ALPHA_PNG;
-
-         output_gamma = PNG_GAMMA_LINEAR;
-      }
-
-      else
-      {
-         mode = PNG_ALPHA_PNG;
-         output_gamma = PNG_DEFAULT_sRGB;
-      }
-      
-      if ((change & PNG_FORMAT_FLAG_ASSOCIATED_ALPHA) != 0)
-      {
-         mode = PNG_ALPHA_OPTIMIZED;
-         change &= ~PNG_FORMAT_FLAG_ASSOCIATED_ALPHA;
-      }
-      
-      /* If 'do_local_background' is set check for the presence of gamma
-       * correction; this is part of the work-round for the libpng bug
-       * described above.
-       *
-       * TODO: fix libpng and remove this.
-       */
-      if (do_local_background != 0)
-      {
-         png_fixed_point gtest;
-
-         /* This is 'png_gamma_threshold' from pngrtran.c; the test used for
-          * gamma correction, the screen gamma hasn't been set on png_struct
-          * yet; it's set below.  png_struct::gamma, however, is set to the
-          * final value.
-          */
-         if (png_muldiv(&gtest, output_gamma, png_ptr->colorspace.gamma,
-             PNG_FP_1) != 0 && png_gamma_significant(gtest) == 0)
-            do_local_background = 0;
-
-         else if (mode == PNG_ALPHA_STANDARD)
-         {
-            do_local_background = 2/*required*/;
-            mode = PNG_ALPHA_PNG; /* prevent libpng doing it */
-         }
-
-         /* else leave as 1 for the checks below */
-      }
-
-      /* If the bit-depth changes then handle that here. */
-      if ((change & PNG_FORMAT_FLAG_LINEAR) != 0)
-      {
-         if (linear != 0 /*16-bit output*/)
-            png_set_expand_16(png_ptr);
-
-         else /* 8-bit output */
-            png_set_scale_16(png_ptr);
-
-         change &= ~PNG_FORMAT_FLAG_LINEAR;
-      }
-
-      /* Now the background/alpha channel changes. */
-      if ((change & PNG_FORMAT_FLAG_ALPHA) != 0)
-      {
-         /* Removing an alpha channel requires composition for the 8-bit
-          * formats; for the 16-bit it is already done, above, by the
-          * pre-multiplication and the channel just needs to be stripped.
-          */
-         if ((base_format & PNG_FORMAT_FLAG_ALPHA) != 0)
-         {
-            /* If RGB->gray is happening the alpha channel must be left and the
-             * operation completed locally.
-             *
-             * TODO: fix libpng and remove this.
-             */
-            if (do_local_background != 0)
-               do_local_background = 2/*required*/;
-
-            /* 16-bit output: just remove the channel */
-            else if (linear != 0) /* compose on black (well, pre-multiply) */
-               png_set_strip_alpha(png_ptr);
-
-            /* 8-bit output: do an appropriate compose */
-            else if (display->background != NULL)
-            {
-               png_color_16 c;
-
-               c.index = 0; /*unused*/
-               c.red = display->background->red;
-               c.green = display->background->green;
-               c.blue = display->background->blue;
-               c.gray = display->background->green;
-
-               /* This is always an 8-bit sRGB value, using the 'green' channel
-                * for gray is much better than calculating the luminance here;
-                * we can get off-by-one errors in that calculation relative to
-                * the app expectations and that will show up in transparent
-                * pixels.
-                */
-               png_set_background_fixed(png_ptr, &c,
-                   PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/,
-                   0/*gamma: not used*/);
-            }
-
-            else /* compose on row: implemented below. */
-            {
-               do_local_compose = 1;
-               /* This leaves the alpha channel in the output, so it has to be
-                * removed by the code below.  Set the encoding to the 'OPTIMIZE'
-                * one so the code only has to hack on the pixels that require
-                * composition.
-                */
-               mode = PNG_ALPHA_OPTIMIZED;
-            }
-         }
-
-         else /* output needs an alpha channel */
-         {
-            /* This is tricky because it happens before the swap operation has
-             * been accomplished; however, the swap does *not* swap the added
-             * alpha channel (weird API), so it must be added in the correct
-             * place.
-             */
-            png_uint_32 filler; /* opaque filler */
-            int where;
-
-            if (linear != 0)
-               filler = 65535;
-
-            else
-               filler = 255;
-
-#ifdef PNG_FORMAT_AFIRST_SUPPORTED
-            if ((format & PNG_FORMAT_FLAG_AFIRST) != 0)
-            {
-               where = PNG_FILLER_BEFORE;
-               change &= ~PNG_FORMAT_FLAG_AFIRST;
-            }
-
-            else
-#endif
-            where = PNG_FILLER_AFTER;
-
-            png_set_add_alpha(png_ptr, filler, where);
-         }
-
-         /* This stops the (irrelevant) call to swap_alpha below. */
-         change &= ~PNG_FORMAT_FLAG_ALPHA;
-      }
-
-      /* Now set the alpha mode correctly; this is always done, even if there is
-       * no alpha channel in either the input or the output because it correctly
-       * sets the output gamma.
-       */
-      png_set_alpha_mode_fixed(png_ptr, mode, output_gamma);
-
-#     ifdef PNG_FORMAT_BGR_SUPPORTED
-         if ((change & PNG_FORMAT_FLAG_BGR) != 0)
-         {
-            /* Check only the output format; PNG is never BGR; don't do this if
-             * the output is gray, but fix up the 'format' value in that case.
-             */
-            if ((format & PNG_FORMAT_FLAG_COLOR) != 0)
-               png_set_bgr(png_ptr);
-
-            else
-               format &= ~PNG_FORMAT_FLAG_BGR;
-
-            change &= ~PNG_FORMAT_FLAG_BGR;
-         }
-#     endif
-
-#     ifdef PNG_FORMAT_AFIRST_SUPPORTED
-         if ((change & PNG_FORMAT_FLAG_AFIRST) != 0)
-         {
-            /* Only relevant if there is an alpha channel - it's particularly
-             * important to handle this correctly because do_local_compose may
-             * be set above and then libpng will keep the alpha channel for this
-             * code to remove.
-             */
-            if ((format & PNG_FORMAT_FLAG_ALPHA) != 0)
-            {
-               /* Disable this if doing a local background,
-                * TODO: remove this when local background is no longer required.
-                */
-               if (do_local_background != 2)
-                  png_set_swap_alpha(png_ptr);
-            }
-
-            else
-               format &= ~PNG_FORMAT_FLAG_AFIRST;
-
-            change &= ~PNG_FORMAT_FLAG_AFIRST;
-         }
-#     endif
-
-      /* If the *output* is 16-bit then we need to check for a byte-swap on this
-       * architecture.
-       */
-      if (linear != 0)
-      {
-         PNG_CONST png_uint_16 le = 0x0001;
-
-         if ((*(png_const_bytep) & le) != 0)
-            png_set_swap(png_ptr);
-      }
-
-      /* If change is not now 0 some transformation is missing - error out. */
-      if (change != 0)
-         png_error(png_ptr, "png_read_image: unsupported transformation");
-   }
-
-   PNG_SKIP_CHUNKS(png_ptr);
-
-   /* Update the 'info' structure and make sure the result is as required; first
-    * make sure to turn on the interlace handling if it will be required
-    * (because it can't be turned on *after* the call to png_read_update_info!)
-    *
-    * TODO: remove the do_local_background fixup below.
-    */
-   if (do_local_compose == 0 && do_local_background != 2)
-      passes = png_set_interlace_handling(png_ptr);
-
-   png_read_update_info(png_ptr, info_ptr);
-
-   {
-      png_uint_32 info_format = 0;
-
-      if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
-         info_format |= PNG_FORMAT_FLAG_COLOR;
-
-      if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)
-      {
-         /* do_local_compose removes this channel below. */
-         if (do_local_compose == 0)
-         {
-            /* do_local_background does the same if required. */
-            if (do_local_background != 2 ||
-               (format & PNG_FORMAT_FLAG_ALPHA) != 0)
-               info_format |= PNG_FORMAT_FLAG_ALPHA;
-         }
-      }
-
-      else if (do_local_compose != 0) /* internal error */
-         png_error(png_ptr, "png_image_read: alpha channel lost");
-
-      if ((format & PNG_FORMAT_FLAG_ASSOCIATED_ALPHA) != 0) {
-         info_format |= PNG_FORMAT_FLAG_ASSOCIATED_ALPHA;
-      }
-
-      if (info_ptr->bit_depth == 16)
-         info_format |= PNG_FORMAT_FLAG_LINEAR;
-
-#ifdef PNG_FORMAT_BGR_SUPPORTED
-      if ((png_ptr->transformations & PNG_BGR) != 0)
-         info_format |= PNG_FORMAT_FLAG_BGR;
-#endif
-
-#ifdef PNG_FORMAT_AFIRST_SUPPORTED
-         if (do_local_background == 2)
-         {
-            if ((format & PNG_FORMAT_FLAG_AFIRST) != 0)
-               info_format |= PNG_FORMAT_FLAG_AFIRST;
-         }
-
-         if ((png_ptr->transformations & PNG_SWAP_ALPHA) != 0 ||
-            ((png_ptr->transformations & PNG_ADD_ALPHA) != 0 &&
-            (png_ptr->flags & PNG_FLAG_FILLER_AFTER) == 0))
-         {
-            if (do_local_background == 2)
-               png_error(png_ptr, "unexpected alpha swap transformation");
-
-            info_format |= PNG_FORMAT_FLAG_AFIRST;
-         }
-#     endif
-
-      /* This is actually an internal error. */
-      if (info_format != format)
-         png_error(png_ptr, "png_read_image: invalid transformations");
-   }
-
-   /* Now read the rows.  If do_local_compose is set then it is necessary to use
-    * a local row buffer.  The output will be GA, RGBA or BGRA and must be
-    * converted to G, RGB or BGR as appropriate.  The 'local_row' member of the
-    * display acts as a flag.
-    */
-   {
-      png_voidp first_row = display->buffer;
-      ptrdiff_t row_bytes = display->row_stride;
-
-      if (linear != 0)
-         row_bytes *= 2;
-
-      /* The following expression is designed to work correctly whether it gives
-       * a signed or an unsigned result.
-       */
-      if (row_bytes < 0)
-      {
-         char *ptr = png_voidcast(char*, first_row);
-         ptr += (image->height-1) * (-row_bytes);
-         first_row = png_voidcast(png_voidp, ptr);
-      }
-
-      display->first_row = first_row;
-      display->row_bytes = row_bytes;
-   }
-
-   if (do_local_compose != 0)
-   {
-      int result;
-      png_voidp row = png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr));
-
-      display->local_row = row;
-      result = png_safe_execute(image, png_image_read_composite, display);
-      display->local_row = NULL;
-      png_free(png_ptr, row);
-
-      return result;
-   }
-
-   else if (do_local_background == 2)
-   {
-      int result;
-      png_voidp row = png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr));
-
-      display->local_row = row;
-      result = png_safe_execute(image, png_image_read_background, display);
-      display->local_row = NULL;
-      png_free(png_ptr, row);
-
-      return result;
-   }
-
-   else
-   {
-      png_alloc_size_t row_bytes = (png_alloc_size_t)display->row_bytes;
-
-      while (--passes >= 0)
-      {
-         png_uint_32      y = image->height;
-         png_bytep        row = png_voidcast(png_bytep, display->first_row);
-
-         for (; y > 0; --y)
-         {
-            png_read_row(png_ptr, row, NULL);
-            row += row_bytes;
-         }
-      }
-
-      return 1;
-   }
-}
-
-int PNGAPI
-png_image_finish_read(png_imagep image, png_const_colorp background,
-    void *buffer, png_int_32 row_stride, void *colormap)
-{
-   if (image != NULL && image->version == PNG_IMAGE_VERSION)
-   {
-      /* Check for row_stride overflow.  This check is not performed on the
-       * original PNG format because it may not occur in the output PNG format
-       * and libpng deals with the issues of reading the original.
-       */
-      const unsigned int channels = PNG_IMAGE_PIXEL_CHANNELS(image->format);
-
-      /* The following checks just the 'row_stride' calculation to ensure it
-       * fits in a signed 32-bit value.  Because channels/components can be
-       * either 1 or 2 bytes in size the length of a row can still overflow 32
-       * bits; this is just to verify that the 'row_stride' argument can be
-       * represented.
-       */
-      if (image->width <= 0x7fffffffU/channels) /* no overflow */
-      {
-         png_uint_32 check;
-         const png_uint_32 png_row_stride = image->width * channels;
-
-         if (row_stride == 0)
-            row_stride = (png_int_32)/*SAFE*/png_row_stride;
-
-         if (row_stride < 0)
-            check = (png_uint_32)(-row_stride);
-
-         else
-            check = (png_uint_32)row_stride;
-
-         /* This verifies 'check', the absolute value of the actual stride
-          * passed in and detects overflow in the application calculation (i.e.
-          * if the app did actually pass in a non-zero 'row_stride'.
-          */
-         if (image->opaque != NULL && buffer != NULL && check >= png_row_stride)
-         {
-            /* Now check for overflow of the image buffer calculation; this
-             * limits the whole image size to 32 bits for API compatibility with
-             * the current, 32-bit, PNG_IMAGE_BUFFER_SIZE macro.
-             *
-             * The PNG_IMAGE_BUFFER_SIZE macro is:
-             *
-             *    (PNG_IMAGE_PIXEL_COMPONENT_SIZE(fmt)*height*(row_stride))
-             *
-             * And the component size is always 1 or 2, so make sure that the
-             * number of *bytes* that the application is saying are available
-             * does actually fit into a 32-bit number.
-             *
-             * NOTE: this will be changed in 1.7 because PNG_IMAGE_BUFFER_SIZE
-             * will be changed to use png_alloc_size_t; bigger images can be
-             * accomodated on 64-bit systems.
-             */
-            if (image->height <=
-                0xffffffffU/PNG_IMAGE_PIXEL_COMPONENT_SIZE(image->format)/check)
-            {
-               if ((image->format & PNG_FORMAT_FLAG_COLORMAP) == 0 ||
-                  (image->colormap_entries > 0 && colormap != NULL))
-               {
-                  int result;
-                  png_image_read_control display;
-
-                  memset(&display, 0, (sizeof display));
-                  display.image = image;
-                  display.buffer = buffer;
-                  display.row_stride = row_stride;
-                  display.colormap = colormap;
-                  display.background = background;
-                  display.local_row = NULL;
-
-                  /* Choose the correct 'end' routine; for the color-map case
-                   * all the setup has already been done.
-                   */
-                  if ((image->format & PNG_FORMAT_FLAG_COLORMAP) != 0)
-                     result =
-                         png_safe_execute(image,
-                             png_image_read_colormap, &display) &&
-                             png_safe_execute(image,
-                             png_image_read_colormapped, &display);
-
-                  else
-                     result =
-                        png_safe_execute(image,
-                            png_image_read_direct, &display);
-
-                  png_image_free(image);
-                  return result;
-               }
-
-               else
-                  return png_image_error(image,
-                      "png_image_finish_read[color-map]: no color-map");
-            }
-
-            else
-               return png_image_error(image,
-                   "png_image_finish_read: image too large");
-         }
-
-         else
-            return png_image_error(image,
-                "png_image_finish_read: invalid argument");
-      }
-
-      else
-         return png_image_error(image,
-             "png_image_finish_read: row_stride too large");
-   }
-
-   else if (image != NULL)
-      return png_image_error(image,
-          "png_image_finish_read: damaged PNG_IMAGE_VERSION");
-
-   return 0;
-}
-
-#endif /* SIMPLIFIED_READ */
-#endif /* READ */
diff --git a/src/png/libpng/pngrio.c b/src/png/libpng/pngrio.c
deleted file mode 100644
index 7e26e855c..000000000
--- a/src/png/libpng/pngrio.c
+++ /dev/null
@@ -1,120 +0,0 @@
-
-/* pngrio.c - functions for data input
- *
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * This file provides a location for all input.  Users who need
- * special handling are expected to write a function that has the same
- * arguments as this and performs a similar function, but that possibly
- * has a different input method.  Note that you shouldn't change this
- * function, but rather write a replacement function and then make
- * libpng use it at run time with png_set_read_fn(...).
- */
-
-#include "pngpriv.h"
-
-#ifdef PNG_READ_SUPPORTED
-
-/* Read the data from whatever input you are using.  The default routine
- * reads from a file pointer.  Note that this routine sometimes gets called
- * with very small lengths, so you should implement some kind of simple
- * buffering if you are using unbuffered reads.  This should never be asked
- * to read more than 64K on a 16-bit machine.
- */
-void /* PRIVATE */
-png_read_data(png_structrp png_ptr, png_bytep data, png_size_t length)
-{
-   png_debug1(4, "reading %d bytes", (int)length);
-
-   if (png_ptr->read_data_fn != NULL)
-      (*(png_ptr->read_data_fn))(png_ptr, data, length);
-
-   else
-      png_error(png_ptr, "Call to NULL read function");
-}
-
-#ifdef PNG_STDIO_SUPPORTED
-/* This is the function that does the actual reading of data.  If you are
- * not reading from a standard C stream, you should create a replacement
- * read_data function and use it at run time with png_set_read_fn(), rather
- * than changing the library.
- */
-void PNGCBAPI
-png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
-{
-   png_size_t check;
-
-   if (png_ptr == NULL)
-      return;
-
-   /* fread() returns 0 on error, so it is OK to store this in a png_size_t
-    * instead of an int, which is what fread() actually returns.
-    */
-   check = fread(data, 1, length, png_voidcast(png_FILE_p, png_ptr->io_ptr));
-
-   if (check != length)
-      png_error(png_ptr, "Read Error");
-}
-#endif
-
-/* This function allows the application to supply a new input function
- * for libpng if standard C streams aren't being used.
- *
- * This function takes as its arguments:
- *
- * png_ptr      - pointer to a png input data structure
- *
- * io_ptr       - pointer to user supplied structure containing info about
- *                the input functions.  May be NULL.
- *
- * read_data_fn - pointer to a new input function that takes as its
- *                arguments a pointer to a png_struct, a pointer to
- *                a location where input data can be stored, and a 32-bit
- *                unsigned int that is the number of bytes to be read.
- *                To exit and output any fatal error messages the new write
- *                function should call png_error(png_ptr, "Error msg").
- *                May be NULL, in which case libpng's default function will
- *                be used.
- */
-void PNGAPI
-png_set_read_fn(png_structrp png_ptr, png_voidp io_ptr,
-    png_rw_ptr read_data_fn)
-{
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->io_ptr = io_ptr;
-
-#ifdef PNG_STDIO_SUPPORTED
-   if (read_data_fn != NULL)
-      png_ptr->read_data_fn = read_data_fn;
-
-   else
-      png_ptr->read_data_fn = png_default_read_data;
-#else
-   png_ptr->read_data_fn = read_data_fn;
-#endif
-
-#ifdef PNG_WRITE_SUPPORTED
-   /* It is an error to write to a read device */
-   if (png_ptr->write_data_fn != NULL)
-   {
-      png_ptr->write_data_fn = NULL;
-      png_warning(png_ptr,
-          "Can't set both read_data_fn and write_data_fn in the"
-          " same structure");
-   }
-#endif
-
-#ifdef PNG_WRITE_FLUSH_SUPPORTED
-   png_ptr->output_flush_fn = NULL;
-#endif
-}
-#endif /* READ */
diff --git a/src/png/libpng/pngrtran.c b/src/png/libpng/pngrtran.c
deleted file mode 100644
index c18965031..000000000
--- a/src/png/libpng/pngrtran.c
+++ /dev/null
@@ -1,5010 +0,0 @@
-
-/* pngrtran.c - transforms the data in a row for PNG readers
- *
- * Last changed in libpng 1.6.33 [September 28, 2017]
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * This file contains functions optionally called by an application
- * in order to tell libpng how to handle data when reading a PNG.
- * Transformations that are used in both reading and writing are
- * in pngtrans.c.
- */
-
-#include "pngpriv.h"
-
-#ifdef PNG_READ_SUPPORTED
-
-/* Set the action on getting a CRC error for an ancillary or critical chunk. */
-void PNGAPI
-png_set_crc_action(png_structrp png_ptr, int crit_action, int ancil_action)
-{
-   png_debug(1, "in png_set_crc_action");
-
-   if (png_ptr == NULL)
-      return;
-
-   /* Tell libpng how we react to CRC errors in critical chunks */
-   switch (crit_action)
-   {
-      case PNG_CRC_NO_CHANGE:                        /* Leave setting as is */
-         break;
-
-      case PNG_CRC_WARN_USE:                               /* Warn/use data */
-         png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
-         png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE;
-         break;
-
-      case PNG_CRC_QUIET_USE:                             /* Quiet/use data */
-         png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
-         png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE |
-                           PNG_FLAG_CRC_CRITICAL_IGNORE;
-         break;
-
-      case PNG_CRC_WARN_DISCARD:    /* Not a valid action for critical data */
-         png_warning(png_ptr,
-             "Can't discard critical data on CRC error");
-         /* FALLTHROUGH */
-      case PNG_CRC_ERROR_QUIT:                                /* Error/quit */
-
-      case PNG_CRC_DEFAULT:
-      default:
-         png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK;
-         break;
-   }
-
-   /* Tell libpng how we react to CRC errors in ancillary chunks */
-   switch (ancil_action)
-   {
-      case PNG_CRC_NO_CHANGE:                       /* Leave setting as is */
-         break;
-
-      case PNG_CRC_WARN_USE:                              /* Warn/use data */
-         png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
-         png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE;
-         break;
-
-      case PNG_CRC_QUIET_USE:                            /* Quiet/use data */
-         png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
-         png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE |
-                           PNG_FLAG_CRC_ANCILLARY_NOWARN;
-         break;
-
-      case PNG_CRC_ERROR_QUIT:                               /* Error/quit */
-         png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
-         png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_NOWARN;
-         break;
-
-      case PNG_CRC_WARN_DISCARD:                      /* Warn/discard data */
-
-      case PNG_CRC_DEFAULT:
-      default:
-         png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK;
-         break;
-   }
-}
-
-#ifdef PNG_READ_TRANSFORMS_SUPPORTED
-/* Is it OK to set a transformation now?  Only if png_start_read_image or
- * png_read_update_info have not been called.  It is not necessary for the IHDR
- * to have been read in all cases; the need_IHDR parameter allows for this
- * check too.
- */
-static int
-png_rtran_ok(png_structrp png_ptr, int need_IHDR)
-{
-   if (png_ptr != NULL)
-   {
-      if ((png_ptr->flags & PNG_FLAG_ROW_INIT) != 0)
-         png_app_error(png_ptr,
-             "invalid after png_start_read_image or png_read_update_info");
-
-      else if (need_IHDR && (png_ptr->mode & PNG_HAVE_IHDR) == 0)
-         png_app_error(png_ptr, "invalid before the PNG header has been read");
-
-      else
-      {
-         /* Turn on failure to initialize correctly for all transforms. */
-         png_ptr->flags |= PNG_FLAG_DETECT_UNINITIALIZED;
-
-         return 1; /* Ok */
-      }
-   }
-
-   return 0; /* no png_error possible! */
-}
-#endif
-
-#ifdef PNG_READ_BACKGROUND_SUPPORTED
-/* Handle alpha and tRNS via a background color */
-void PNGFAPI
-png_set_background_fixed(png_structrp png_ptr,
-    png_const_color_16p background_color, int background_gamma_code,
-    int need_expand, png_fixed_point background_gamma)
-{
-   png_debug(1, "in png_set_background_fixed");
-
-   if (png_rtran_ok(png_ptr, 0) == 0 || background_color == NULL)
-      return;
-
-   if (background_gamma_code == PNG_BACKGROUND_GAMMA_UNKNOWN)
-   {
-      png_warning(png_ptr, "Application must supply a known background gamma");
-      return;
-   }
-
-   png_ptr->transformations |= PNG_COMPOSE | PNG_STRIP_ALPHA;
-   png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
-   png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
-
-   png_ptr->background = *background_color;
-   png_ptr->background_gamma = background_gamma;
-   png_ptr->background_gamma_type = (png_byte)(background_gamma_code);
-   if (need_expand != 0)
-      png_ptr->transformations |= PNG_BACKGROUND_EXPAND;
-   else
-      png_ptr->transformations &= ~PNG_BACKGROUND_EXPAND;
-}
-
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-void PNGAPI
-png_set_background(png_structrp png_ptr,
-    png_const_color_16p background_color, int background_gamma_code,
-    int need_expand, double background_gamma)
-{
-   png_set_background_fixed(png_ptr, background_color, background_gamma_code,
-      need_expand, png_fixed(png_ptr, background_gamma, "png_set_background"));
-}
-#  endif /* FLOATING_POINT */
-#endif /* READ_BACKGROUND */
-
-/* Scale 16-bit depth files to 8-bit depth.  If both of these are set then the
- * one that pngrtran does first (scale) happens.  This is necessary to allow the
- * TRANSFORM and API behavior to be somewhat consistent, and it's simpler.
- */
-#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
-void PNGAPI
-png_set_scale_16(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_scale_16");
-
-   if (png_rtran_ok(png_ptr, 0) == 0)
-      return;
-
-   png_ptr->transformations |= PNG_SCALE_16_TO_8;
-}
-#endif
-
-#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
-/* Chop 16-bit depth files to 8-bit depth */
-void PNGAPI
-png_set_strip_16(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_strip_16");
-
-   if (png_rtran_ok(png_ptr, 0) == 0)
-      return;
-
-   png_ptr->transformations |= PNG_16_TO_8;
-}
-#endif
-
-#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
-void PNGAPI
-png_set_strip_alpha(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_strip_alpha");
-
-   if (png_rtran_ok(png_ptr, 0) == 0)
-      return;
-
-   png_ptr->transformations |= PNG_STRIP_ALPHA;
-}
-#endif
-
-#if defined(PNG_READ_ALPHA_MODE_SUPPORTED) || defined(PNG_READ_GAMMA_SUPPORTED)
-static png_fixed_point
-translate_gamma_flags(png_structrp png_ptr, png_fixed_point output_gamma,
-    int is_screen)
-{
-   /* Check for flag values.  The main reason for having the old Mac value as a
-    * flag is that it is pretty near impossible to work out what the correct
-    * value is from Apple documentation - a working Mac system is needed to
-    * discover the value!
-    */
-   if (output_gamma == PNG_DEFAULT_sRGB ||
-      output_gamma == PNG_FP_1 / PNG_DEFAULT_sRGB)
-   {
-      /* If there is no sRGB support this just sets the gamma to the standard
-       * sRGB value.  (This is a side effect of using this function!)
-       */
-#     ifdef PNG_READ_sRGB_SUPPORTED
-         png_ptr->flags |= PNG_FLAG_ASSUME_sRGB;
-#     else
-         PNG_UNUSED(png_ptr)
-#     endif
-      if (is_screen != 0)
-         output_gamma = PNG_GAMMA_sRGB;
-      else
-         output_gamma = PNG_GAMMA_sRGB_INVERSE;
-   }
-
-   else if (output_gamma == PNG_GAMMA_MAC_18 ||
-      output_gamma == PNG_FP_1 / PNG_GAMMA_MAC_18)
-   {
-      if (is_screen != 0)
-         output_gamma = PNG_GAMMA_MAC_OLD;
-      else
-         output_gamma = PNG_GAMMA_MAC_INVERSE;
-   }
-
-   return output_gamma;
-}
-
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-static png_fixed_point
-convert_gamma_value(png_structrp png_ptr, double output_gamma)
-{
-   /* The following silently ignores cases where fixed point (times 100,000)
-    * gamma values are passed to the floating point API.  This is safe and it
-    * means the fixed point constants work just fine with the floating point
-    * API.  The alternative would just lead to undetected errors and spurious
-    * bug reports.  Negative values fail inside the _fixed API unless they
-    * correspond to the flag values.
-    */
-   if (output_gamma > 0 && output_gamma < 128)
-      output_gamma *= PNG_FP_1;
-
-   /* This preserves -1 and -2 exactly: */
-   output_gamma = floor(output_gamma + .5);
-
-   if (output_gamma > PNG_FP_MAX || output_gamma < PNG_FP_MIN)
-      png_fixed_error(png_ptr, "gamma value");
-
-   return (png_fixed_point)output_gamma;
-}
-#  endif
-#endif /* READ_ALPHA_MODE || READ_GAMMA */
-
-#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
-void PNGFAPI
-png_set_alpha_mode_fixed(png_structrp png_ptr, int mode,
-    png_fixed_point output_gamma)
-{
-   int compose = 0;
-   png_fixed_point file_gamma;
-
-   png_debug(1, "in png_set_alpha_mode");
-
-   if (png_rtran_ok(png_ptr, 0) == 0)
-      return;
-
-   output_gamma = translate_gamma_flags(png_ptr, output_gamma, 1/*screen*/);
-
-   /* Validate the value to ensure it is in a reasonable range. The value
-    * is expected to be 1 or greater, but this range test allows for some
-    * viewing correction values.  The intent is to weed out users of this API
-    * who use the inverse of the gamma value accidentally!  Since some of these
-    * values are reasonable this may have to be changed:
-    *
-    * 1.6.x: changed from 0.07..3 to 0.01..100 (to accomodate the optimal 16-bit
-    * gamma of 36, and its reciprocal.)
-    */
-   if (output_gamma < 1000 || output_gamma > 10000000)
-      png_error(png_ptr, "output gamma out of expected range");
-
-   /* The default file gamma is the inverse of the output gamma; the output
-    * gamma may be changed below so get the file value first:
-    */
-   file_gamma = png_reciprocal(output_gamma);
-
-   /* There are really 8 possibilities here, composed of any combination
-    * of:
-    *
-    *    premultiply the color channels
-    *    do not encode non-opaque pixels
-    *    encode the alpha as well as the color channels
-    *
-    * The differences disappear if the input/output ('screen') gamma is 1.0,
-    * because then the encoding is a no-op and there is only the choice of
-    * premultiplying the color channels or not.
-    *
-    * png_set_alpha_mode and png_set_background interact because both use
-    * png_compose to do the work.  Calling both is only useful when
-    * png_set_alpha_mode is used to set the default mode - PNG_ALPHA_PNG - along
-    * with a default gamma value.  Otherwise PNG_COMPOSE must not be set.
-    */
-   switch (mode)
-   {
-      case PNG_ALPHA_PNG:        /* default: png standard */
-         /* No compose, but it may be set by png_set_background! */
-         png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
-         png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
-         break;
-
-      case PNG_ALPHA_ASSOCIATED: /* color channels premultiplied */
-         compose = 1;
-         png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
-         png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
-         /* The output is linear: */
-         output_gamma = PNG_FP_1;
-         break;
-
-      case PNG_ALPHA_OPTIMIZED:  /* associated, non-opaque pixels linear */
-         compose = 1;
-         png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
-         png_ptr->flags |= PNG_FLAG_OPTIMIZE_ALPHA;
-         /* output_gamma records the encoding of opaque pixels! */
-         break;
-
-      case PNG_ALPHA_BROKEN:     /* associated, non-linear, alpha encoded */
-         compose = 1;
-         png_ptr->transformations |= PNG_ENCODE_ALPHA;
-         png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
-         break;
-
-      default:
-         png_error(png_ptr, "invalid alpha mode");
-   }
-
-   /* Only set the default gamma if the file gamma has not been set (this has
-    * the side effect that the gamma in a second call to png_set_alpha_mode will
-    * be ignored.)
-    */
-   if (png_ptr->colorspace.gamma == 0)
-   {
-      png_ptr->colorspace.gamma = file_gamma;
-      png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA;
-   }
-
-   /* But always set the output gamma: */
-   png_ptr->screen_gamma = output_gamma;
-
-   /* Finally, if pre-multiplying, set the background fields to achieve the
-    * desired result.
-    */
-   if (compose != 0)
-   {
-      /* And obtain alpha pre-multiplication by composing on black: */
-      memset(&png_ptr->background, 0, (sizeof png_ptr->background));
-      png_ptr->background_gamma = png_ptr->colorspace.gamma; /* just in case */
-      png_ptr->background_gamma_type = PNG_BACKGROUND_GAMMA_FILE;
-      png_ptr->transformations &= ~PNG_BACKGROUND_EXPAND;
-
-      if ((png_ptr->transformations & PNG_COMPOSE) != 0)
-         png_error(png_ptr,
-             "conflicting calls to set alpha mode and background");
-
-      png_ptr->transformations |= PNG_COMPOSE;
-   }
-}
-
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-void PNGAPI
-png_set_alpha_mode(png_structrp png_ptr, int mode, double output_gamma)
-{
-   png_set_alpha_mode_fixed(png_ptr, mode, convert_gamma_value(png_ptr,
-       output_gamma));
-}
-#  endif
-#endif
-
-#ifdef PNG_READ_QUANTIZE_SUPPORTED
-/* Dither file to 8-bit.  Supply a palette, the current number
- * of elements in the palette, the maximum number of elements
- * allowed, and a histogram if possible.  If the current number
- * of colors is greater than the maximum number, the palette will be
- * modified to fit in the maximum number.  "full_quantize" indicates
- * whether we need a quantizing cube set up for RGB images, or if we
- * simply are reducing the number of colors in a paletted image.
- */
-
-typedef struct png_dsort_struct
-{
-   struct png_dsort_struct * next;
-   png_byte left;
-   png_byte right;
-} png_dsort;
-typedef png_dsort *   png_dsortp;
-typedef png_dsort * * png_dsortpp;
-
-void PNGAPI
-png_set_quantize(png_structrp png_ptr, png_colorp palette,
-    int num_palette, int maximum_colors, png_const_uint_16p histogram,
-    int full_quantize)
-{
-   png_debug(1, "in png_set_quantize");
-
-   if (png_rtran_ok(png_ptr, 0) == 0)
-      return;
-
-   png_ptr->transformations |= PNG_QUANTIZE;
-
-   if (full_quantize == 0)
-   {
-      int i;
-
-      png_ptr->quantize_index = (png_bytep)png_malloc(png_ptr,
-          (png_alloc_size_t)((png_uint_32)num_palette * (sizeof (png_byte))));
-      for (i = 0; i < num_palette; i++)
-         png_ptr->quantize_index[i] = (png_byte)i;
-   }
-
-   if (num_palette > maximum_colors)
-   {
-      if (histogram != NULL)
-      {
-         /* This is easy enough, just throw out the least used colors.
-          * Perhaps not the best solution, but good enough.
-          */
-
-         int i;
-
-         /* Initialize an array to sort colors */
-         png_ptr->quantize_sort = (png_bytep)png_malloc(png_ptr,
-             (png_alloc_size_t)((png_uint_32)num_palette * (sizeof (png_byte))));
-
-         /* Initialize the quantize_sort array */
-         for (i = 0; i < num_palette; i++)
-            png_ptr->quantize_sort[i] = (png_byte)i;
-
-         /* Find the least used palette entries by starting a
-          * bubble sort, and running it until we have sorted
-          * out enough colors.  Note that we don't care about
-          * sorting all the colors, just finding which are
-          * least used.
-          */
-
-         for (i = num_palette - 1; i >= maximum_colors; i--)
-         {
-            int done; /* To stop early if the list is pre-sorted */
-            int j;
-
-            done = 1;
-            for (j = 0; j < i; j++)
-            {
-               if (histogram[png_ptr->quantize_sort[j]]
-                   < histogram[png_ptr->quantize_sort[j + 1]])
-               {
-                  png_byte t;
-
-                  t = png_ptr->quantize_sort[j];
-                  png_ptr->quantize_sort[j] = png_ptr->quantize_sort[j + 1];
-                  png_ptr->quantize_sort[j + 1] = t;
-                  done = 0;
-               }
-            }
-
-            if (done != 0)
-               break;
-         }
-
-         /* Swap the palette around, and set up a table, if necessary */
-         if (full_quantize != 0)
-         {
-            int j = num_palette;
-
-            /* Put all the useful colors within the max, but don't
-             * move the others.
-             */
-            for (i = 0; i < maximum_colors; i++)
-            {
-               if ((int)png_ptr->quantize_sort[i] >= maximum_colors)
-               {
-                  do
-                     j--;
-                  while ((int)png_ptr->quantize_sort[j] >= maximum_colors);
-
-                  palette[i] = palette[j];
-               }
-            }
-         }
-         else
-         {
-            int j = num_palette;
-
-            /* Move all the used colors inside the max limit, and
-             * develop a translation table.
-             */
-            for (i = 0; i < maximum_colors; i++)
-            {
-               /* Only move the colors we need to */
-               if ((int)png_ptr->quantize_sort[i] >= maximum_colors)
-               {
-                  png_color tmp_color;
-
-                  do
-                     j--;
-                  while ((int)png_ptr->quantize_sort[j] >= maximum_colors);
-
-                  tmp_color = palette[j];
-                  palette[j] = palette[i];
-                  palette[i] = tmp_color;
-                  /* Indicate where the color went */
-                  png_ptr->quantize_index[j] = (png_byte)i;
-                  png_ptr->quantize_index[i] = (png_byte)j;
-               }
-            }
-
-            /* Find closest color for those colors we are not using */
-            for (i = 0; i < num_palette; i++)
-            {
-               if ((int)png_ptr->quantize_index[i] >= maximum_colors)
-               {
-                  int min_d, k, min_k, d_index;
-
-                  /* Find the closest color to one we threw out */
-                  d_index = png_ptr->quantize_index[i];
-                  min_d = PNG_COLOR_DIST(palette[d_index], palette[0]);
-                  for (k = 1, min_k = 0; k < maximum_colors; k++)
-                  {
-                     int d;
-
-                     d = PNG_COLOR_DIST(palette[d_index], palette[k]);
-
-                     if (d < min_d)
-                     {
-                        min_d = d;
-                        min_k = k;
-                     }
-                  }
-                  /* Point to closest color */
-                  png_ptr->quantize_index[i] = (png_byte)min_k;
-               }
-            }
-         }
-         png_free(png_ptr, png_ptr->quantize_sort);
-         png_ptr->quantize_sort = NULL;
-      }
-      else
-      {
-         /* This is much harder to do simply (and quickly).  Perhaps
-          * we need to go through a median cut routine, but those
-          * don't always behave themselves with only a few colors
-          * as input.  So we will just find the closest two colors,
-          * and throw out one of them (chosen somewhat randomly).
-          * [We don't understand this at all, so if someone wants to
-          *  work on improving it, be our guest - AED, GRP]
-          */
-         int i;
-         int max_d;
-         int num_new_palette;
-         png_dsortp t;
-         png_dsortpp hash;
-
-         t = NULL;
-
-         /* Initialize palette index arrays */
-         png_ptr->index_to_palette = (png_bytep)png_malloc(png_ptr,
-             (png_alloc_size_t)((png_uint_32)num_palette *
-             (sizeof (png_byte))));
-         png_ptr->palette_to_index = (png_bytep)png_malloc(png_ptr,
-             (png_alloc_size_t)((png_uint_32)num_palette *
-             (sizeof (png_byte))));
-
-         /* Initialize the sort array */
-         for (i = 0; i < num_palette; i++)
-         {
-            png_ptr->index_to_palette[i] = (png_byte)i;
-            png_ptr->palette_to_index[i] = (png_byte)i;
-         }
-
-         hash = (png_dsortpp)png_calloc(png_ptr, (png_alloc_size_t)(769 *
-             (sizeof (png_dsortp))));
-
-         num_new_palette = num_palette;
-
-         /* Initial wild guess at how far apart the farthest pixel
-          * pair we will be eliminating will be.  Larger
-          * numbers mean more areas will be allocated, Smaller
-          * numbers run the risk of not saving enough data, and
-          * having to do this all over again.
-          *
-          * I have not done extensive checking on this number.
-          */
-         max_d = 96;
-
-         while (num_new_palette > maximum_colors)
-         {
-            for (i = 0; i < num_new_palette - 1; i++)
-            {
-               int j;
-
-               for (j = i + 1; j < num_new_palette; j++)
-               {
-                  int d;
-
-                  d = PNG_COLOR_DIST(palette[i], palette[j]);
-
-                  if (d <= max_d)
-                  {
-
-                     t = (png_dsortp)png_malloc_warn(png_ptr,
-                         (png_alloc_size_t)(sizeof (png_dsort)));
-
-                     if (t == NULL)
-                         break;
-
-                     t->next = hash[d];
-                     t->left = (png_byte)i;
-                     t->right = (png_byte)j;
-                     hash[d] = t;
-                  }
-               }
-               if (t == NULL)
-                  break;
-            }
-
-            if (t != NULL)
-            for (i = 0; i <= max_d; i++)
-            {
-               if (hash[i] != NULL)
-               {
-                  png_dsortp p;
-
-                  for (p = hash[i]; p; p = p->next)
-                  {
-                     if ((int)png_ptr->index_to_palette[p->left]
-                         < num_new_palette &&
-                         (int)png_ptr->index_to_palette[p->right]
-                         < num_new_palette)
-                     {
-                        int j, next_j;
-
-                        if (num_new_palette & 0x01)
-                        {
-                           j = p->left;
-                           next_j = p->right;
-                        }
-                        else
-                        {
-                           j = p->right;
-                           next_j = p->left;
-                        }
-
-                        num_new_palette--;
-                        palette[png_ptr->index_to_palette[j]]
-                            = palette[num_new_palette];
-                        if (full_quantize == 0)
-                        {
-                           int k;
-
-                           for (k = 0; k < num_palette; k++)
-                           {
-                              if (png_ptr->quantize_index[k] ==
-                                  png_ptr->index_to_palette[j])
-                                 png_ptr->quantize_index[k] =
-                                     png_ptr->index_to_palette[next_j];
-
-                              if ((int)png_ptr->quantize_index[k] ==
-                                  num_new_palette)
-                                 png_ptr->quantize_index[k] =
-                                     png_ptr->index_to_palette[j];
-                           }
-                        }
-
-                        png_ptr->index_to_palette[png_ptr->palette_to_index
-                            [num_new_palette]] = png_ptr->index_to_palette[j];
-
-                        png_ptr->palette_to_index[png_ptr->index_to_palette[j]]
-                            = png_ptr->palette_to_index[num_new_palette];
-
-                        png_ptr->index_to_palette[j] =
-                            (png_byte)num_new_palette;
-
-                        png_ptr->palette_to_index[num_new_palette] =
-                            (png_byte)j;
-                     }
-                     if (num_new_palette <= maximum_colors)
-                        break;
-                  }
-                  if (num_new_palette <= maximum_colors)
-                     break;
-               }
-            }
-
-            for (i = 0; i < 769; i++)
-            {
-               if (hash[i] != NULL)
-               {
-                  png_dsortp p = hash[i];
-                  while (p)
-                  {
-                     t = p->next;
-                     png_free(png_ptr, p);
-                     p = t;
-                  }
-               }
-               hash[i] = 0;
-            }
-            max_d += 96;
-         }
-         png_free(png_ptr, hash);
-         png_free(png_ptr, png_ptr->palette_to_index);
-         png_free(png_ptr, png_ptr->index_to_palette);
-         png_ptr->palette_to_index = NULL;
-         png_ptr->index_to_palette = NULL;
-      }
-      num_palette = maximum_colors;
-   }
-   if (png_ptr->palette == NULL)
-   {
-      png_ptr->palette = palette;
-   }
-   png_ptr->num_palette = (png_uint_16)num_palette;
-
-   if (full_quantize != 0)
-   {
-      int i;
-      png_bytep distance;
-      int total_bits = PNG_QUANTIZE_RED_BITS + PNG_QUANTIZE_GREEN_BITS +
-          PNG_QUANTIZE_BLUE_BITS;
-      int num_red = (1 << PNG_QUANTIZE_RED_BITS);
-      int num_green = (1 << PNG_QUANTIZE_GREEN_BITS);
-      int num_blue = (1 << PNG_QUANTIZE_BLUE_BITS);
-      png_size_t num_entries = ((png_size_t)1 << total_bits);
-
-      png_ptr->palette_lookup = (png_bytep)png_calloc(png_ptr,
-          (png_alloc_size_t)(num_entries * (sizeof (png_byte))));
-
-      distance = (png_bytep)png_malloc(png_ptr, (png_alloc_size_t)(num_entries *
-          (sizeof (png_byte))));
-
-      memset(distance, 0xff, num_entries * (sizeof (png_byte)));
-
-      for (i = 0; i < num_palette; i++)
-      {
-         int ir, ig, ib;
-         int r = (palette[i].red >> (8 - PNG_QUANTIZE_RED_BITS));
-         int g = (palette[i].green >> (8 - PNG_QUANTIZE_GREEN_BITS));
-         int b = (palette[i].blue >> (8 - PNG_QUANTIZE_BLUE_BITS));
-
-         for (ir = 0; ir < num_red; ir++)
-         {
-            /* int dr = abs(ir - r); */
-            int dr = ((ir > r) ? ir - r : r - ir);
-            int index_r = (ir << (PNG_QUANTIZE_BLUE_BITS +
-                PNG_QUANTIZE_GREEN_BITS));
-
-            for (ig = 0; ig < num_green; ig++)
-            {
-               /* int dg = abs(ig - g); */
-               int dg = ((ig > g) ? ig - g : g - ig);
-               int dt = dr + dg;
-               int dm = ((dr > dg) ? dr : dg);
-               int index_g = index_r | (ig << PNG_QUANTIZE_BLUE_BITS);
-
-               for (ib = 0; ib < num_blue; ib++)
-               {
-                  int d_index = index_g | ib;
-                  /* int db = abs(ib - b); */
-                  int db = ((ib > b) ? ib - b : b - ib);
-                  int dmax = ((dm > db) ? dm : db);
-                  int d = dmax + dt + db;
-
-                  if (d < (int)distance[d_index])
-                  {
-                     distance[d_index] = (png_byte)d;
-                     png_ptr->palette_lookup[d_index] = (png_byte)i;
-                  }
-               }
-            }
-         }
-      }
-
-      png_free(png_ptr, distance);
-   }
-}
-#endif /* READ_QUANTIZE */
-
-#ifdef PNG_READ_GAMMA_SUPPORTED
-void PNGFAPI
-png_set_gamma_fixed(png_structrp png_ptr, png_fixed_point scrn_gamma,
-    png_fixed_point file_gamma)
-{
-   png_debug(1, "in png_set_gamma_fixed");
-
-   if (png_rtran_ok(png_ptr, 0) == 0)
-      return;
-
-   /* New in libpng-1.5.4 - reserve particular negative values as flags. */
-   scrn_gamma = translate_gamma_flags(png_ptr, scrn_gamma, 1/*screen*/);
-   file_gamma = translate_gamma_flags(png_ptr, file_gamma, 0/*file*/);
-
-   /* Checking the gamma values for being >0 was added in 1.5.4 along with the
-    * premultiplied alpha support; this actually hides an undocumented feature
-    * of the previous implementation which allowed gamma processing to be
-    * disabled in background handling.  There is no evidence (so far) that this
-    * was being used; however, png_set_background itself accepted and must still
-    * accept '0' for the gamma value it takes, because it isn't always used.
-    *
-    * Since this is an API change (albeit a very minor one that removes an
-    * undocumented API feature) the following checks were only enabled in
-    * libpng-1.6.0.
-    */
-   if (file_gamma <= 0)
-      png_error(png_ptr, "invalid file gamma in png_set_gamma");
-
-   if (scrn_gamma <= 0)
-      png_error(png_ptr, "invalid screen gamma in png_set_gamma");
-
-   /* Set the gamma values unconditionally - this overrides the value in the PNG
-    * file if a gAMA chunk was present.  png_set_alpha_mode provides a
-    * different, easier, way to default the file gamma.
-    */
-   png_ptr->colorspace.gamma = file_gamma;
-   png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA;
-   png_ptr->screen_gamma = scrn_gamma;
-}
-
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-void PNGAPI
-png_set_gamma(png_structrp png_ptr, double scrn_gamma, double file_gamma)
-{
-   png_set_gamma_fixed(png_ptr, convert_gamma_value(png_ptr, scrn_gamma),
-       convert_gamma_value(png_ptr, file_gamma));
-}
-#  endif /* FLOATING_POINT */
-#endif /* READ_GAMMA */
-
-#ifdef PNG_READ_EXPAND_SUPPORTED
-/* Expand paletted images to RGB, expand grayscale images of
- * less than 8-bit depth to 8-bit depth, and expand tRNS chunks
- * to alpha channels.
- */
-void PNGAPI
-png_set_expand(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_expand");
-
-   if (png_rtran_ok(png_ptr, 0) == 0)
-      return;
-
-   png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
-}
-
-/* GRR 19990627:  the following three functions currently are identical
- *  to png_set_expand().  However, it is entirely reasonable that someone
- *  might wish to expand an indexed image to RGB but *not* expand a single,
- *  fully transparent palette entry to a full alpha channel--perhaps instead
- *  convert tRNS to the grayscale/RGB format (16-bit RGB value), or replace
- *  the transparent color with a particular RGB value, or drop tRNS entirely.
- *  IOW, a future version of the library may make the transformations flag
- *  a bit more fine-grained, with separate bits for each of these three
- *  functions.
- *
- *  More to the point, these functions make it obvious what libpng will be
- *  doing, whereas "expand" can (and does) mean any number of things.
- *
- *  GRP 20060307: In libpng-1.2.9, png_set_gray_1_2_4_to_8() was modified
- *  to expand only the sample depth but not to expand the tRNS to alpha
- *  and its name was changed to png_set_expand_gray_1_2_4_to_8().
- */
-
-/* Expand paletted images to RGB. */
-void PNGAPI
-png_set_palette_to_rgb(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_palette_to_rgb");
-
-   if (png_rtran_ok(png_ptr, 0) == 0)
-      return;
-
-   png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
-}
-
-/* Expand grayscale images of less than 8-bit depth to 8 bits. */
-void PNGAPI
-png_set_expand_gray_1_2_4_to_8(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_expand_gray_1_2_4_to_8");
-
-   if (png_rtran_ok(png_ptr, 0) == 0)
-      return;
-
-   png_ptr->transformations |= PNG_EXPAND;
-}
-
-/* Expand tRNS chunks to alpha channels. */
-void PNGAPI
-png_set_tRNS_to_alpha(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_tRNS_to_alpha");
-
-   if (png_rtran_ok(png_ptr, 0) == 0)
-      return;
-
-   png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
-}
-#endif /* READ_EXPAND */
-
-#ifdef PNG_READ_EXPAND_16_SUPPORTED
-/* Expand to 16-bit channels, expand the tRNS chunk too (because otherwise
- * it may not work correctly.)
- */
-void PNGAPI
-png_set_expand_16(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_expand_16");
-
-   if (png_rtran_ok(png_ptr, 0) == 0)
-      return;
-
-   png_ptr->transformations |= (PNG_EXPAND_16 | PNG_EXPAND | PNG_EXPAND_tRNS);
-}
-#endif
-
-#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
-void PNGAPI
-png_set_gray_to_rgb(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_gray_to_rgb");
-
-   if (png_rtran_ok(png_ptr, 0) == 0)
-      return;
-
-   /* Because rgb must be 8 bits or more: */
-   png_set_expand_gray_1_2_4_to_8(png_ptr);
-   png_ptr->transformations |= PNG_GRAY_TO_RGB;
-}
-#endif
-
-#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-void PNGFAPI
-png_set_rgb_to_gray_fixed(png_structrp png_ptr, int error_action,
-    png_fixed_point red, png_fixed_point green)
-{
-   png_debug(1, "in png_set_rgb_to_gray");
-
-   /* Need the IHDR here because of the check on color_type below. */
-   /* TODO: fix this */
-   if (png_rtran_ok(png_ptr, 1) == 0)
-      return;
-
-   switch (error_action)
-   {
-      case PNG_ERROR_ACTION_NONE:
-         png_ptr->transformations |= PNG_RGB_TO_GRAY;
-         break;
-
-      case PNG_ERROR_ACTION_WARN:
-         png_ptr->transformations |= PNG_RGB_TO_GRAY_WARN;
-         break;
-
-      case PNG_ERROR_ACTION_ERROR:
-         png_ptr->transformations |= PNG_RGB_TO_GRAY_ERR;
-         break;
-
-      default:
-         png_error(png_ptr, "invalid error action to rgb_to_gray");
-   }
-
-   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-#ifdef PNG_READ_EXPAND_SUPPORTED
-      png_ptr->transformations |= PNG_EXPAND;
-#else
-   {
-      /* Make this an error in 1.6 because otherwise the application may assume
-       * that it just worked and get a memory overwrite.
-       */
-      png_error(png_ptr,
-          "Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED");
-
-      /* png_ptr->transformations &= ~PNG_RGB_TO_GRAY; */
-   }
-#endif
-   {
-      if (red >= 0 && green >= 0 && red + green <= PNG_FP_1)
-      {
-         png_uint_16 red_int, green_int;
-
-         /* NOTE: this calculation does not round, but this behavior is retained
-          * for consistency; the inaccuracy is very small.  The code here always
-          * overwrites the coefficients, regardless of whether they have been
-          * defaulted or set already.
-          */
-         red_int = (png_uint_16)(((png_uint_32)red*32768)/100000);
-         green_int = (png_uint_16)(((png_uint_32)green*32768)/100000);
-
-         png_ptr->rgb_to_gray_red_coeff   = red_int;
-         png_ptr->rgb_to_gray_green_coeff = green_int;
-         png_ptr->rgb_to_gray_coefficients_set = 1;
-      }
-
-      else
-      {
-         if (red >= 0 && green >= 0)
-            png_app_warning(png_ptr,
-                "ignoring out of range rgb_to_gray coefficients");
-
-         /* Use the defaults, from the cHRM chunk if set, else the historical
-          * values which are close to the sRGB/HDTV/ITU-Rec 709 values.  See
-          * png_do_rgb_to_gray for more discussion of the values.  In this case
-          * the coefficients are not marked as 'set' and are not overwritten if
-          * something has already provided a default.
-          */
-         if (png_ptr->rgb_to_gray_red_coeff == 0 &&
-             png_ptr->rgb_to_gray_green_coeff == 0)
-         {
-            png_ptr->rgb_to_gray_red_coeff   = 6968;
-            png_ptr->rgb_to_gray_green_coeff = 23434;
-            /* png_ptr->rgb_to_gray_blue_coeff  = 2366; */
-         }
-      }
-   }
-}
-
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-/* Convert a RGB image to a grayscale of the same width.  This allows us,
- * for example, to convert a 24 bpp RGB image into an 8 bpp grayscale image.
- */
-
-void PNGAPI
-png_set_rgb_to_gray(png_structrp png_ptr, int error_action, double red,
-    double green)
-{
-   png_set_rgb_to_gray_fixed(png_ptr, error_action,
-       png_fixed(png_ptr, red, "rgb to gray red coefficient"),
-      png_fixed(png_ptr, green, "rgb to gray green coefficient"));
-}
-#endif /* FLOATING POINT */
-
-#endif /* RGB_TO_GRAY */
-
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-void PNGAPI
-png_set_read_user_transform_fn(png_structrp png_ptr, png_user_transform_ptr
-    read_user_transform_fn)
-{
-   png_debug(1, "in png_set_read_user_transform_fn");
-
-#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
-   png_ptr->transformations |= PNG_USER_TRANSFORM;
-   png_ptr->read_user_transform_fn = read_user_transform_fn;
-#endif
-}
-#endif
-
-#ifdef PNG_READ_TRANSFORMS_SUPPORTED
-#ifdef PNG_READ_GAMMA_SUPPORTED
-/* In the case of gamma transformations only do transformations on images where
- * the [file] gamma and screen_gamma are not close reciprocals, otherwise it
- * slows things down slightly, and also needlessly introduces small errors.
- */
-static int /* PRIVATE */
-png_gamma_threshold(png_fixed_point screen_gamma, png_fixed_point file_gamma)
-{
-   /* PNG_GAMMA_THRESHOLD is the threshold for performing gamma
-    * correction as a difference of the overall transform from 1.0
-    *
-    * We want to compare the threshold with s*f - 1, if we get
-    * overflow here it is because of wacky gamma values so we
-    * turn on processing anyway.
-    */
-   png_fixed_point gtest;
-   return !png_muldiv(&gtest, screen_gamma, file_gamma, PNG_FP_1) ||
-       png_gamma_significant(gtest);
-}
-#endif
-
-/* Initialize everything needed for the read.  This includes modifying
- * the palette.
- */
-
-/* For the moment 'png_init_palette_transformations' and
- * 'png_init_rgb_transformations' only do some flag canceling optimizations.
- * The intent is that these two routines should have palette or rgb operations
- * extracted from 'png_init_read_transformations'.
- */
-static void /* PRIVATE */
-png_init_palette_transformations(png_structrp png_ptr)
-{
-   /* Called to handle the (input) palette case.  In png_do_read_transformations
-    * the first step is to expand the palette if requested, so this code must
-    * take care to only make changes that are invariant with respect to the
-    * palette expansion, or only do them if there is no expansion.
-    *
-    * STRIP_ALPHA has already been handled in the caller (by setting num_trans
-    * to 0.)
-    */
-   int input_has_alpha = 0;
-   int input_has_transparency = 0;
-
-   if (png_ptr->num_trans > 0)
-   {
-      int i;
-
-      /* Ignore if all the entries are opaque (unlikely!) */
-      for (i=0; i<png_ptr->num_trans; ++i)
-      {
-         if (png_ptr->trans_alpha[i] == 255)
-            continue;
-         else if (png_ptr->trans_alpha[i] == 0)
-            input_has_transparency = 1;
-         else
-         {
-            input_has_transparency = 1;
-            input_has_alpha = 1;
-            break;
-         }
-      }
-   }
-
-   /* If no alpha we can optimize. */
-   if (input_has_alpha == 0)
-   {
-      /* Any alpha means background and associative alpha processing is
-       * required, however if the alpha is 0 or 1 throughout OPTIMIZE_ALPHA
-       * and ENCODE_ALPHA are irrelevant.
-       */
-      png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
-      png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
-
-      if (input_has_transparency == 0)
-         png_ptr->transformations &= ~(PNG_COMPOSE | PNG_BACKGROUND_EXPAND);
-   }
-
-#if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED)
-   /* png_set_background handling - deals with the complexity of whether the
-    * background color is in the file format or the screen format in the case
-    * where an 'expand' will happen.
-    */
-
-   /* The following code cannot be entered in the alpha pre-multiplication case
-    * because PNG_BACKGROUND_EXPAND is cancelled below.
-    */
-   if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) != 0 &&
-       (png_ptr->transformations & PNG_EXPAND) != 0)
-   {
-      {
-         png_ptr->background.red   =
-             png_ptr->palette[png_ptr->background.index].red;
-         png_ptr->background.green =
-             png_ptr->palette[png_ptr->background.index].green;
-         png_ptr->background.blue  =
-             png_ptr->palette[png_ptr->background.index].blue;
-
-#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
-        if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0)
-        {
-           if ((png_ptr->transformations & PNG_EXPAND_tRNS) == 0)
-           {
-              /* Invert the alpha channel (in tRNS) unless the pixels are
-               * going to be expanded, in which case leave it for later
-               */
-              int i, istop = png_ptr->num_trans;
-
-              for (i=0; i<istop; i++)
-                 png_ptr->trans_alpha[i] = (png_byte)(255 -
-                    png_ptr->trans_alpha[i]);
-           }
-        }
-#endif /* READ_INVERT_ALPHA */
-      }
-   } /* background expand and (therefore) no alpha association. */
-#endif /* READ_EXPAND && READ_BACKGROUND */
-}
-
-static void /* PRIVATE */
-png_init_rgb_transformations(png_structrp png_ptr)
-{
-   /* Added to libpng-1.5.4: check the color type to determine whether there
-    * is any alpha or transparency in the image and simply cancel the
-    * background and alpha mode stuff if there isn't.
-    */
-   int input_has_alpha = (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0;
-   int input_has_transparency = png_ptr->num_trans > 0;
-
-   /* If no alpha we can optimize. */
-   if (input_has_alpha == 0)
-   {
-      /* Any alpha means background and associative alpha processing is
-       * required, however if the alpha is 0 or 1 throughout OPTIMIZE_ALPHA
-       * and ENCODE_ALPHA are irrelevant.
-       */
-#     ifdef PNG_READ_ALPHA_MODE_SUPPORTED
-         png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
-         png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
-#     endif
-
-      if (input_has_transparency == 0)
-         png_ptr->transformations &= ~(PNG_COMPOSE | PNG_BACKGROUND_EXPAND);
-   }
-
-#if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED)
-   /* png_set_background handling - deals with the complexity of whether the
-    * background color is in the file format or the screen format in the case
-    * where an 'expand' will happen.
-    */
-
-   /* The following code cannot be entered in the alpha pre-multiplication case
-    * because PNG_BACKGROUND_EXPAND is cancelled below.
-    */
-   if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) != 0 &&
-       (png_ptr->transformations & PNG_EXPAND) != 0 &&
-       (png_ptr->color_type & PNG_COLOR_MASK_COLOR) == 0)
-       /* i.e., GRAY or GRAY_ALPHA */
-   {
-      {
-         /* Expand background and tRNS chunks */
-         int gray = png_ptr->background.gray;
-         int trans_gray = png_ptr->trans_color.gray;
-
-         switch (png_ptr->bit_depth)
-         {
-            case 1:
-               gray *= 0xff;
-               trans_gray *= 0xff;
-               break;
-
-            case 2:
-               gray *= 0x55;
-               trans_gray *= 0x55;
-               break;
-
-            case 4:
-               gray *= 0x11;
-               trans_gray *= 0x11;
-               break;
-
-            default:
-
-            case 8:
-               /* FALLTHROUGH */ /*  (Already 8 bits) */
-
-            case 16:
-               /* Already a full 16 bits */
-               break;
-         }
-
-         png_ptr->background.red = png_ptr->background.green =
-            png_ptr->background.blue = (png_uint_16)gray;
-
-         if ((png_ptr->transformations & PNG_EXPAND_tRNS) == 0)
-         {
-            png_ptr->trans_color.red = png_ptr->trans_color.green =
-               png_ptr->trans_color.blue = (png_uint_16)trans_gray;
-         }
-      }
-   } /* background expand and (therefore) no alpha association. */
-#endif /* READ_EXPAND && READ_BACKGROUND */
-}
-
-void /* PRIVATE */
-png_init_read_transformations(png_structrp png_ptr)
-{
-   png_debug(1, "in png_init_read_transformations");
-
-   /* This internal function is called from png_read_start_row in pngrutil.c
-    * and it is called before the 'rowbytes' calculation is done, so the code
-    * in here can change or update the transformations flags.
-    *
-    * First do updates that do not depend on the details of the PNG image data
-    * being processed.
-    */
-
-#ifdef PNG_READ_GAMMA_SUPPORTED
-   /* Prior to 1.5.4 these tests were performed from png_set_gamma, 1.5.4 adds
-    * png_set_alpha_mode and this is another source for a default file gamma so
-    * the test needs to be performed later - here.  In addition prior to 1.5.4
-    * the tests were repeated for the PALETTE color type here - this is no
-    * longer necessary (and doesn't seem to have been necessary before.)
-    */
-   {
-      /* The following temporary indicates if overall gamma correction is
-       * required.
-       */
-      int gamma_correction = 0;
-
-      if (png_ptr->colorspace.gamma != 0) /* has been set */
-      {
-         if (png_ptr->screen_gamma != 0) /* screen set too */
-            gamma_correction = png_gamma_threshold(png_ptr->colorspace.gamma,
-                png_ptr->screen_gamma);
-
-         else
-            /* Assume the output matches the input; a long time default behavior
-             * of libpng, although the standard has nothing to say about this.
-             */
-            png_ptr->screen_gamma = png_reciprocal(png_ptr->colorspace.gamma);
-      }
-
-      else if (png_ptr->screen_gamma != 0)
-         /* The converse - assume the file matches the screen, note that this
-          * perhaps undesireable default can (from 1.5.4) be changed by calling
-          * png_set_alpha_mode (even if the alpha handling mode isn't required
-          * or isn't changed from the default.)
-          */
-         png_ptr->colorspace.gamma = png_reciprocal(png_ptr->screen_gamma);
-
-      else /* neither are set */
-         /* Just in case the following prevents any processing - file and screen
-          * are both assumed to be linear and there is no way to introduce a
-          * third gamma value other than png_set_background with 'UNIQUE', and,
-          * prior to 1.5.4
-          */
-         png_ptr->screen_gamma = png_ptr->colorspace.gamma = PNG_FP_1;
-
-      /* We have a gamma value now. */
-      png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA;
-
-      /* Now turn the gamma transformation on or off as appropriate.  Notice
-       * that PNG_GAMMA just refers to the file->screen correction.  Alpha
-       * composition may independently cause gamma correction because it needs
-       * linear data (e.g. if the file has a gAMA chunk but the screen gamma
-       * hasn't been specified.)  In any case this flag may get turned off in
-       * the code immediately below if the transform can be handled outside the
-       * row loop.
-       */
-      if (gamma_correction != 0)
-         png_ptr->transformations |= PNG_GAMMA;
-
-      else
-         png_ptr->transformations &= ~PNG_GAMMA;
-   }
-#endif
-
-   /* Certain transformations have the effect of preventing other
-    * transformations that happen afterward in png_do_read_transformations;
-    * resolve the interdependencies here.  From the code of
-    * png_do_read_transformations the order is:
-    *
-    *  1) PNG_EXPAND (including PNG_EXPAND_tRNS)
-    *  2) PNG_STRIP_ALPHA (if no compose)
-    *  3) PNG_RGB_TO_GRAY
-    *  4) PNG_GRAY_TO_RGB iff !PNG_BACKGROUND_IS_GRAY
-    *  5) PNG_COMPOSE
-    *  6) PNG_GAMMA
-    *  7) PNG_STRIP_ALPHA (if compose)
-    *  8) PNG_ENCODE_ALPHA
-    *  9) PNG_SCALE_16_TO_8
-    * 10) PNG_16_TO_8
-    * 11) PNG_QUANTIZE (converts to palette)
-    * 12) PNG_EXPAND_16
-    * 13) PNG_GRAY_TO_RGB iff PNG_BACKGROUND_IS_GRAY
-    * 14) PNG_INVERT_MONO
-    * 15) PNG_INVERT_ALPHA
-    * 16) PNG_SHIFT
-    * 17) PNG_PACK
-    * 18) PNG_BGR
-    * 19) PNG_PACKSWAP
-    * 20) PNG_FILLER (includes PNG_ADD_ALPHA)
-    * 21) PNG_SWAP_ALPHA
-    * 22) PNG_SWAP_BYTES
-    * 23) PNG_USER_TRANSFORM [must be last]
-    */
-#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
-   if ((png_ptr->transformations & PNG_STRIP_ALPHA) != 0 &&
-       (png_ptr->transformations & PNG_COMPOSE) == 0)
-   {
-      /* Stripping the alpha channel happens immediately after the 'expand'
-       * transformations, before all other transformation, so it cancels out
-       * the alpha handling.  It has the side effect negating the effect of
-       * PNG_EXPAND_tRNS too:
-       */
-      png_ptr->transformations &= ~(PNG_BACKGROUND_EXPAND | PNG_ENCODE_ALPHA |
-         PNG_EXPAND_tRNS);
-      png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
-
-      /* Kill the tRNS chunk itself too.  Prior to 1.5.4 this did not happen
-       * so transparency information would remain just so long as it wasn't
-       * expanded.  This produces unexpected API changes if the set of things
-       * that do PNG_EXPAND_tRNS changes (perfectly possible given the
-       * documentation - which says ask for what you want, accept what you
-       * get.)  This makes the behavior consistent from 1.5.4:
-       */
-      png_ptr->num_trans = 0;
-   }
-#endif /* STRIP_ALPHA supported, no COMPOSE */
-
-#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
-   /* If the screen gamma is about 1.0 then the OPTIMIZE_ALPHA and ENCODE_ALPHA
-    * settings will have no effect.
-    */
-   if (png_gamma_significant(png_ptr->screen_gamma) == 0)
-   {
-      png_ptr->transformations &= ~PNG_ENCODE_ALPHA;
-      png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA;
-   }
-#endif
-
-#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-   /* Make sure the coefficients for the rgb to gray conversion are set
-    * appropriately.
-    */
-   if ((png_ptr->transformations & PNG_RGB_TO_GRAY) != 0)
-      png_colorspace_set_rgb_coefficients(png_ptr);
-#endif
-
-#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
-#if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED)
-   /* Detect gray background and attempt to enable optimization for
-    * gray --> RGB case.
-    *
-    * Note:  if PNG_BACKGROUND_EXPAND is set and color_type is either RGB or
-    * RGB_ALPHA (in which case need_expand is superfluous anyway), the
-    * background color might actually be gray yet not be flagged as such.
-    * This is not a problem for the current code, which uses
-    * PNG_BACKGROUND_IS_GRAY only to decide when to do the
-    * png_do_gray_to_rgb() transformation.
-    *
-    * TODO: this code needs to be revised to avoid the complexity and
-    * interdependencies.  The color type of the background should be recorded in
-    * png_set_background, along with the bit depth, then the code has a record
-    * of exactly what color space the background is currently in.
-    */
-   if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) != 0)
-   {
-      /* PNG_BACKGROUND_EXPAND: the background is in the file color space, so if
-       * the file was grayscale the background value is gray.
-       */
-      if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) == 0)
-         png_ptr->mode |= PNG_BACKGROUND_IS_GRAY;
-   }
-
-   else if ((png_ptr->transformations & PNG_COMPOSE) != 0)
-   {
-      /* PNG_COMPOSE: png_set_background was called with need_expand false,
-       * so the color is in the color space of the output or png_set_alpha_mode
-       * was called and the color is black.  Ignore RGB_TO_GRAY because that
-       * happens before GRAY_TO_RGB.
-       */
-      if ((png_ptr->transformations & PNG_GRAY_TO_RGB) != 0)
-      {
-         if (png_ptr->background.red == png_ptr->background.green &&
-             png_ptr->background.red == png_ptr->background.blue)
-         {
-            png_ptr->mode |= PNG_BACKGROUND_IS_GRAY;
-            png_ptr->background.gray = png_ptr->background.red;
-         }
-      }
-   }
-#endif /* READ_EXPAND && READ_BACKGROUND */
-#endif /* READ_GRAY_TO_RGB */
-
-   /* For indexed PNG data (PNG_COLOR_TYPE_PALETTE) many of the transformations
-    * can be performed directly on the palette, and some (such as rgb to gray)
-    * can be optimized inside the palette.  This is particularly true of the
-    * composite (background and alpha) stuff, which can be pretty much all done
-    * in the palette even if the result is expanded to RGB or gray afterward.
-    *
-    * NOTE: this is Not Yet Implemented, the code behaves as in 1.5.1 and
-    * earlier and the palette stuff is actually handled on the first row.  This
-    * leads to the reported bug that the palette returned by png_get_PLTE is not
-    * updated.
-    */
-   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      png_init_palette_transformations(png_ptr);
-
-   else
-      png_init_rgb_transformations(png_ptr);
-
-#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
-   defined(PNG_READ_EXPAND_16_SUPPORTED)
-   if ((png_ptr->transformations & PNG_EXPAND_16) != 0 &&
-       (png_ptr->transformations & PNG_COMPOSE) != 0 &&
-       (png_ptr->transformations & PNG_BACKGROUND_EXPAND) == 0 &&
-       png_ptr->bit_depth != 16)
-   {
-      /* TODO: fix this.  Because the expand_16 operation is after the compose
-       * handling the background color must be 8, not 16, bits deep, but the
-       * application will supply a 16-bit value so reduce it here.
-       *
-       * The PNG_BACKGROUND_EXPAND code above does not expand to 16 bits at
-       * present, so that case is ok (until do_expand_16 is moved.)
-       *
-       * NOTE: this discards the low 16 bits of the user supplied background
-       * color, but until expand_16 works properly there is no choice!
-       */
-#     define CHOP(x) (x)=((png_uint_16)PNG_DIV257(x))
-      CHOP(png_ptr->background.red);
-      CHOP(png_ptr->background.green);
-      CHOP(png_ptr->background.blue);
-      CHOP(png_ptr->background.gray);
-#     undef CHOP
-   }
-#endif /* READ_BACKGROUND && READ_EXPAND_16 */
-
-#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
-   (defined(PNG_READ_SCALE_16_TO_8_SUPPORTED) || \
-   defined(PNG_READ_STRIP_16_TO_8_SUPPORTED))
-   if ((png_ptr->transformations & (PNG_16_TO_8|PNG_SCALE_16_TO_8)) != 0 &&
-       (png_ptr->transformations & PNG_COMPOSE) != 0 &&
-       (png_ptr->transformations & PNG_BACKGROUND_EXPAND) == 0 &&
-       png_ptr->bit_depth == 16)
-   {
-      /* On the other hand, if a 16-bit file is to be reduced to 8-bits per
-       * component this will also happen after PNG_COMPOSE and so the background
-       * color must be pre-expanded here.
-       *
-       * TODO: fix this too.
-       */
-      png_ptr->background.red = (png_uint_16)(png_ptr->background.red * 257);
-      png_ptr->background.green =
-         (png_uint_16)(png_ptr->background.green * 257);
-      png_ptr->background.blue = (png_uint_16)(png_ptr->background.blue * 257);
-      png_ptr->background.gray = (png_uint_16)(png_ptr->background.gray * 257);
-   }
-#endif
-
-   /* NOTE: below 'PNG_READ_ALPHA_MODE_SUPPORTED' is presumed to also enable the
-    * background support (see the comments in scripts/pnglibconf.dfa), this
-    * allows pre-multiplication of the alpha channel to be implemented as
-    * compositing on black.  This is probably sub-optimal and has been done in
-    * 1.5.4 betas simply to enable external critique and testing (i.e. to
-    * implement the new API quickly, without lots of internal changes.)
-    */
-
-#ifdef PNG_READ_GAMMA_SUPPORTED
-#  ifdef PNG_READ_BACKGROUND_SUPPORTED
-      /* Includes ALPHA_MODE */
-      png_ptr->background_1 = png_ptr->background;
-#  endif
-
-   /* This needs to change - in the palette image case a whole set of tables are
-    * built when it would be quicker to just calculate the correct value for
-    * each palette entry directly.  Also, the test is too tricky - why check
-    * PNG_RGB_TO_GRAY if PNG_GAMMA is not set?  The answer seems to be that
-    * PNG_GAMMA is cancelled even if the gamma is known?  The test excludes the
-    * PNG_COMPOSE case, so apparently if there is no *overall* gamma correction
-    * the gamma tables will not be built even if composition is required on a
-    * gamma encoded value.
-    *
-    * In 1.5.4 this is addressed below by an additional check on the individual
-    * file gamma - if it is not 1.0 both RGB_TO_GRAY and COMPOSE need the
-    * tables.
-    */
-   if ((png_ptr->transformations & PNG_GAMMA) != 0 ||
-       ((png_ptr->transformations & PNG_RGB_TO_GRAY) != 0 &&
-        (png_gamma_significant(png_ptr->colorspace.gamma) != 0 ||
-         png_gamma_significant(png_ptr->screen_gamma) != 0)) ||
-        ((png_ptr->transformations & PNG_COMPOSE) != 0 &&
-         (png_gamma_significant(png_ptr->colorspace.gamma) != 0 ||
-          png_gamma_significant(png_ptr->screen_gamma) != 0
-#  ifdef PNG_READ_BACKGROUND_SUPPORTED
-         || (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_UNIQUE &&
-           png_gamma_significant(png_ptr->background_gamma) != 0)
-#  endif
-        )) || ((png_ptr->transformations & PNG_ENCODE_ALPHA) != 0 &&
-       png_gamma_significant(png_ptr->screen_gamma) != 0))
-   {
-      png_build_gamma_table(png_ptr, png_ptr->bit_depth);
-
-#ifdef PNG_READ_BACKGROUND_SUPPORTED
-      if ((png_ptr->transformations & PNG_COMPOSE) != 0)
-      {
-         /* Issue a warning about this combination: because RGB_TO_GRAY is
-          * optimized to do the gamma transform if present yet do_background has
-          * to do the same thing if both options are set a
-          * double-gamma-correction happens.  This is true in all versions of
-          * libpng to date.
-          */
-         if ((png_ptr->transformations & PNG_RGB_TO_GRAY) != 0)
-            png_warning(png_ptr,
-                "libpng does not support gamma+background+rgb_to_gray");
-
-         if ((png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) != 0)
-         {
-            /* We don't get to here unless there is a tRNS chunk with non-opaque
-             * entries - see the checking code at the start of this function.
-             */
-            png_color back, back_1;
-            png_colorp palette = png_ptr->palette;
-            int num_palette = png_ptr->num_palette;
-            int i;
-            if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE)
-            {
-
-               back.red = png_ptr->gamma_table[png_ptr->background.red];
-               back.green = png_ptr->gamma_table[png_ptr->background.green];
-               back.blue = png_ptr->gamma_table[png_ptr->background.blue];
-
-               back_1.red = png_ptr->gamma_to_1[png_ptr->background.red];
-               back_1.green = png_ptr->gamma_to_1[png_ptr->background.green];
-               back_1.blue = png_ptr->gamma_to_1[png_ptr->background.blue];
-            }
-            else
-            {
-               png_fixed_point g, gs;
-
-               switch (png_ptr->background_gamma_type)
-               {
-                  case PNG_BACKGROUND_GAMMA_SCREEN:
-                     g = (png_ptr->screen_gamma);
-                     gs = PNG_FP_1;
-                     break;
-
-                  case PNG_BACKGROUND_GAMMA_FILE:
-                     g = png_reciprocal(png_ptr->colorspace.gamma);
-                     gs = png_reciprocal2(png_ptr->colorspace.gamma,
-                         png_ptr->screen_gamma);
-                     break;
-
-                  case PNG_BACKGROUND_GAMMA_UNIQUE:
-                     g = png_reciprocal(png_ptr->background_gamma);
-                     gs = png_reciprocal2(png_ptr->background_gamma,
-                         png_ptr->screen_gamma);
-                     break;
-                  default:
-                     g = PNG_FP_1;    /* back_1 */
-                     gs = PNG_FP_1;   /* back */
-                     break;
-               }
-
-               if (png_gamma_significant(gs) != 0)
-               {
-                  back.red = png_gamma_8bit_correct(png_ptr->background.red,
-                      gs);
-                  back.green = png_gamma_8bit_correct(png_ptr->background.green,
-                      gs);
-                  back.blue = png_gamma_8bit_correct(png_ptr->background.blue,
-                      gs);
-               }
-
-               else
-               {
-                  back.red   = (png_byte)png_ptr->background.red;
-                  back.green = (png_byte)png_ptr->background.green;
-                  back.blue  = (png_byte)png_ptr->background.blue;
-               }
-
-               if (png_gamma_significant(g) != 0)
-               {
-                  back_1.red = png_gamma_8bit_correct(png_ptr->background.red,
-                      g);
-                  back_1.green = png_gamma_8bit_correct(
-                      png_ptr->background.green, g);
-                  back_1.blue = png_gamma_8bit_correct(png_ptr->background.blue,
-                      g);
-               }
-
-               else
-               {
-                  back_1.red   = (png_byte)png_ptr->background.red;
-                  back_1.green = (png_byte)png_ptr->background.green;
-                  back_1.blue  = (png_byte)png_ptr->background.blue;
-               }
-            }
-
-            for (i = 0; i < num_palette; i++)
-            {
-               if (i < (int)png_ptr->num_trans &&
-                   png_ptr->trans_alpha[i] != 0xff)
-               {
-                  if (png_ptr->trans_alpha[i] == 0)
-                  {
-                     palette[i] = back;
-                  }
-                  else /* if (png_ptr->trans_alpha[i] != 0xff) */
-                  {
-                     png_byte v, w;
-
-                     v = png_ptr->gamma_to_1[palette[i].red];
-                     png_composite(w, v, png_ptr->trans_alpha[i], back_1.red);
-                     palette[i].red = png_ptr->gamma_from_1[w];
-
-                     v = png_ptr->gamma_to_1[palette[i].green];
-                     png_composite(w, v, png_ptr->trans_alpha[i], back_1.green);
-                     palette[i].green = png_ptr->gamma_from_1[w];
-
-                     v = png_ptr->gamma_to_1[palette[i].blue];
-                     png_composite(w, v, png_ptr->trans_alpha[i], back_1.blue);
-                     palette[i].blue = png_ptr->gamma_from_1[w];
-                  }
-               }
-               else
-               {
-                  palette[i].red = png_ptr->gamma_table[palette[i].red];
-                  palette[i].green = png_ptr->gamma_table[palette[i].green];
-                  palette[i].blue = png_ptr->gamma_table[palette[i].blue];
-               }
-            }
-
-            /* Prevent the transformations being done again.
-             *
-             * NOTE: this is highly dubious; it removes the transformations in
-             * place.  This seems inconsistent with the general treatment of the
-             * transformations elsewhere.
-             */
-            png_ptr->transformations &= ~(PNG_COMPOSE | PNG_GAMMA);
-         } /* color_type == PNG_COLOR_TYPE_PALETTE */
-
-         /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */
-         else /* color_type != PNG_COLOR_TYPE_PALETTE */
-         {
-            int gs_sig, g_sig;
-            png_fixed_point g = PNG_FP_1;  /* Correction to linear */
-            png_fixed_point gs = PNG_FP_1; /* Correction to screen */
-
-            switch (png_ptr->background_gamma_type)
-            {
-               case PNG_BACKGROUND_GAMMA_SCREEN:
-                  g = png_ptr->screen_gamma;
-                  /* gs = PNG_FP_1; */
-                  break;
-
-               case PNG_BACKGROUND_GAMMA_FILE:
-                  g = png_reciprocal(png_ptr->colorspace.gamma);
-                  gs = png_reciprocal2(png_ptr->colorspace.gamma,
-                      png_ptr->screen_gamma);
-                  break;
-
-               case PNG_BACKGROUND_GAMMA_UNIQUE:
-                  g = png_reciprocal(png_ptr->background_gamma);
-                  gs = png_reciprocal2(png_ptr->background_gamma,
-                      png_ptr->screen_gamma);
-                  break;
-
-               default:
-                  png_error(png_ptr, "invalid background gamma type");
-            }
-
-            g_sig = png_gamma_significant(g);
-            gs_sig = png_gamma_significant(gs);
-
-            if (g_sig != 0)
-               png_ptr->background_1.gray = png_gamma_correct(png_ptr,
-                   png_ptr->background.gray, g);
-
-            if (gs_sig != 0)
-               png_ptr->background.gray = png_gamma_correct(png_ptr,
-                   png_ptr->background.gray, gs);
-
-            if ((png_ptr->background.red != png_ptr->background.green) ||
-                (png_ptr->background.red != png_ptr->background.blue) ||
-                (png_ptr->background.red != png_ptr->background.gray))
-            {
-               /* RGB or RGBA with color background */
-               if (g_sig != 0)
-               {
-                  png_ptr->background_1.red = png_gamma_correct(png_ptr,
-                      png_ptr->background.red, g);
-
-                  png_ptr->background_1.green = png_gamma_correct(png_ptr,
-                      png_ptr->background.green, g);
-
-                  png_ptr->background_1.blue = png_gamma_correct(png_ptr,
-                      png_ptr->background.blue, g);
-               }
-
-               if (gs_sig != 0)
-               {
-                  png_ptr->background.red = png_gamma_correct(png_ptr,
-                      png_ptr->background.red, gs);
-
-                  png_ptr->background.green = png_gamma_correct(png_ptr,
-                      png_ptr->background.green, gs);
-
-                  png_ptr->background.blue = png_gamma_correct(png_ptr,
-                      png_ptr->background.blue, gs);
-               }
-            }
-
-            else
-            {
-               /* GRAY, GRAY ALPHA, RGB, or RGBA with gray background */
-               png_ptr->background_1.red = png_ptr->background_1.green
-                   = png_ptr->background_1.blue = png_ptr->background_1.gray;
-
-               png_ptr->background.red = png_ptr->background.green
-                   = png_ptr->background.blue = png_ptr->background.gray;
-            }
-
-            /* The background is now in screen gamma: */
-            png_ptr->background_gamma_type = PNG_BACKGROUND_GAMMA_SCREEN;
-         } /* color_type != PNG_COLOR_TYPE_PALETTE */
-      }/* png_ptr->transformations & PNG_BACKGROUND */
-
-      else
-      /* Transformation does not include PNG_BACKGROUND */
-#endif /* READ_BACKGROUND */
-      if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE
-#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-         /* RGB_TO_GRAY needs to have non-gamma-corrected values! */
-         && ((png_ptr->transformations & PNG_EXPAND) == 0 ||
-         (png_ptr->transformations & PNG_RGB_TO_GRAY) == 0)
-#endif
-         )
-      {
-         png_colorp palette = png_ptr->palette;
-         int num_palette = png_ptr->num_palette;
-         int i;
-
-         /* NOTE: there are other transformations that should probably be in
-          * here too.
-          */
-         for (i = 0; i < num_palette; i++)
-         {
-            palette[i].red = png_ptr->gamma_table[palette[i].red];
-            palette[i].green = png_ptr->gamma_table[palette[i].green];
-            palette[i].blue = png_ptr->gamma_table[palette[i].blue];
-         }
-
-         /* Done the gamma correction. */
-         png_ptr->transformations &= ~PNG_GAMMA;
-      } /* color_type == PALETTE && !PNG_BACKGROUND transformation */
-   }
-#ifdef PNG_READ_BACKGROUND_SUPPORTED
-   else
-#endif
-#endif /* READ_GAMMA */
-
-#ifdef PNG_READ_BACKGROUND_SUPPORTED
-   /* No GAMMA transformation (see the hanging else 4 lines above) */
-   if ((png_ptr->transformations & PNG_COMPOSE) != 0 &&
-       (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE))
-   {
-      int i;
-      int istop = (int)png_ptr->num_trans;
-      png_color back;
-      png_colorp palette = png_ptr->palette;
-
-      back.red   = (png_byte)png_ptr->background.red;
-      back.green = (png_byte)png_ptr->background.green;
-      back.blue  = (png_byte)png_ptr->background.blue;
-
-      for (i = 0; i < istop; i++)
-      {
-         if (png_ptr->trans_alpha[i] == 0)
-         {
-            palette[i] = back;
-         }
-
-         else if (png_ptr->trans_alpha[i] != 0xff)
-         {
-            /* The png_composite() macro is defined in png.h */
-            png_composite(palette[i].red, palette[i].red,
-                png_ptr->trans_alpha[i], back.red);
-
-            png_composite(palette[i].green, palette[i].green,
-                png_ptr->trans_alpha[i], back.green);
-
-            png_composite(palette[i].blue, palette[i].blue,
-                png_ptr->trans_alpha[i], back.blue);
-         }
-      }
-
-      png_ptr->transformations &= ~PNG_COMPOSE;
-   }
-#endif /* READ_BACKGROUND */
-
-#ifdef PNG_READ_SHIFT_SUPPORTED
-   if ((png_ptr->transformations & PNG_SHIFT) != 0 &&
-       (png_ptr->transformations & PNG_EXPAND) == 0 &&
-       (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE))
-   {
-      int i;
-      int istop = png_ptr->num_palette;
-      int shift = 8 - png_ptr->sig_bit.red;
-
-      png_ptr->transformations &= ~PNG_SHIFT;
-
-      /* significant bits can be in the range 1 to 7 for a meaninful result, if
-       * the number of significant bits is 0 then no shift is done (this is an
-       * error condition which is silently ignored.)
-       */
-      if (shift > 0 && shift < 8)
-         for (i=0; i<istop; ++i)
-         {
-            int component = png_ptr->palette[i].red;
-
-            component >>= shift;
-            png_ptr->palette[i].red = (png_byte)component;
-         }
-
-      shift = 8 - png_ptr->sig_bit.green;
-      if (shift > 0 && shift < 8)
-         for (i=0; i<istop; ++i)
-         {
-            int component = png_ptr->palette[i].green;
-
-            component >>= shift;
-            png_ptr->palette[i].green = (png_byte)component;
-         }
-
-      shift = 8 - png_ptr->sig_bit.blue;
-      if (shift > 0 && shift < 8)
-         for (i=0; i<istop; ++i)
-         {
-            int component = png_ptr->palette[i].blue;
-
-            component >>= shift;
-            png_ptr->palette[i].blue = (png_byte)component;
-         }
-   }
-#endif /* READ_SHIFT */
-}
-
-/* Modify the info structure to reflect the transformations.  The
- * info should be updated so a PNG file could be written with it,
- * assuming the transformations result in valid PNG data.
- */
-void /* PRIVATE */
-png_read_transform_info(png_structrp png_ptr, png_inforp info_ptr)
-{
-   png_debug(1, "in png_read_transform_info");
-
-#ifdef PNG_READ_EXPAND_SUPPORTED
-   if ((png_ptr->transformations & PNG_EXPAND) != 0)
-   {
-      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      {
-         /* This check must match what actually happens in
-          * png_do_expand_palette; if it ever checks the tRNS chunk to see if
-          * it is all opaque we must do the same (at present it does not.)
-          */
-         if (png_ptr->num_trans > 0)
-            info_ptr->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
-
-         else
-            info_ptr->color_type = PNG_COLOR_TYPE_RGB;
-
-         info_ptr->bit_depth = 8;
-         info_ptr->num_trans = 0;
-
-         if (png_ptr->palette == NULL)
-            png_error (png_ptr, "Palette is NULL in indexed image");
-      }
-      else
-      {
-         if (png_ptr->num_trans != 0)
-         {
-            if ((png_ptr->transformations & PNG_EXPAND_tRNS) != 0)
-               info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
-         }
-         if (info_ptr->bit_depth < 8)
-            info_ptr->bit_depth = 8;
-
-         info_ptr->num_trans = 0;
-      }
-   }
-#endif
-
-#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
-   defined(PNG_READ_ALPHA_MODE_SUPPORTED)
-   /* The following is almost certainly wrong unless the background value is in
-    * the screen space!
-    */
-   if ((png_ptr->transformations & PNG_COMPOSE) != 0)
-      info_ptr->background = png_ptr->background;
-#endif
-
-#ifdef PNG_READ_GAMMA_SUPPORTED
-   /* The following used to be conditional on PNG_GAMMA (prior to 1.5.4),
-    * however it seems that the code in png_init_read_transformations, which has
-    * been called before this from png_read_update_info->png_read_start_row
-    * sometimes does the gamma transform and cancels the flag.
-    *
-    * TODO: this looks wrong; the info_ptr should end up with a gamma equal to
-    * the screen_gamma value.  The following probably results in weirdness if
-    * the info_ptr is used by the app after the rows have been read.
-    */
-   info_ptr->colorspace.gamma = png_ptr->colorspace.gamma;
-#endif
-
-   if (info_ptr->bit_depth == 16)
-   {
-#  ifdef PNG_READ_16BIT_SUPPORTED
-#     ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
-         if ((png_ptr->transformations & PNG_SCALE_16_TO_8) != 0)
-            info_ptr->bit_depth = 8;
-#     endif
-
-#     ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
-         if ((png_ptr->transformations & PNG_16_TO_8) != 0)
-            info_ptr->bit_depth = 8;
-#     endif
-
-#  else
-      /* No 16-bit support: force chopping 16-bit input down to 8, in this case
-       * the app program can chose if both APIs are available by setting the
-       * correct scaling to use.
-       */
-#     ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
-         /* For compatibility with previous versions use the strip method by
-          * default.  This code works because if PNG_SCALE_16_TO_8 is already
-          * set the code below will do that in preference to the chop.
-          */
-         png_ptr->transformations |= PNG_16_TO_8;
-         info_ptr->bit_depth = 8;
-#     else
-
-#        ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
-            png_ptr->transformations |= PNG_SCALE_16_TO_8;
-            info_ptr->bit_depth = 8;
-#        else
-
-            CONFIGURATION ERROR: you must enable at least one 16 to 8 method
-#        endif
-#    endif
-#endif /* !READ_16BIT */
-   }
-
-#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
-   if ((png_ptr->transformations & PNG_GRAY_TO_RGB) != 0)
-      info_ptr->color_type = (png_byte)(info_ptr->color_type |
-         PNG_COLOR_MASK_COLOR);
-#endif
-
-#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-   if ((png_ptr->transformations & PNG_RGB_TO_GRAY) != 0)
-      info_ptr->color_type = (png_byte)(info_ptr->color_type &
-         ~PNG_COLOR_MASK_COLOR);
-#endif
-
-#ifdef PNG_READ_QUANTIZE_SUPPORTED
-   if ((png_ptr->transformations & PNG_QUANTIZE) != 0)
-   {
-      if (((info_ptr->color_type == PNG_COLOR_TYPE_RGB) ||
-          (info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)) &&
-          png_ptr->palette_lookup != 0 && info_ptr->bit_depth == 8)
-      {
-         info_ptr->color_type = PNG_COLOR_TYPE_PALETTE;
-      }
-   }
-#endif
-
-#ifdef PNG_READ_EXPAND_16_SUPPORTED
-   if ((png_ptr->transformations & PNG_EXPAND_16) != 0 &&
-       info_ptr->bit_depth == 8 &&
-       info_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
-   {
-      info_ptr->bit_depth = 16;
-   }
-#endif
-
-#ifdef PNG_READ_PACK_SUPPORTED
-   if ((png_ptr->transformations & PNG_PACK) != 0 &&
-       (info_ptr->bit_depth < 8))
-      info_ptr->bit_depth = 8;
-#endif
-
-   if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      info_ptr->channels = 1;
-
-   else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
-      info_ptr->channels = 3;
-
-   else
-      info_ptr->channels = 1;
-
-#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
-   if ((png_ptr->transformations & PNG_STRIP_ALPHA) != 0)
-   {
-      info_ptr->color_type = (png_byte)(info_ptr->color_type &
-         ~PNG_COLOR_MASK_ALPHA);
-      info_ptr->num_trans = 0;
-   }
-#endif
-
-   if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)
-      info_ptr->channels++;
-
-#ifdef PNG_READ_FILLER_SUPPORTED
-   /* STRIP_ALPHA and FILLER allowed:  MASK_ALPHA bit stripped above */
-   if ((png_ptr->transformations & PNG_FILLER) != 0 &&
-       (info_ptr->color_type == PNG_COLOR_TYPE_RGB ||
-       info_ptr->color_type == PNG_COLOR_TYPE_GRAY))
-   {
-      info_ptr->channels++;
-      /* If adding a true alpha channel not just filler */
-      if ((png_ptr->transformations & PNG_ADD_ALPHA) != 0)
-         info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
-   }
-#endif
-
-#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) && \
-defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
-   if ((png_ptr->transformations & PNG_USER_TRANSFORM) != 0)
-   {
-      if (png_ptr->user_transform_depth != 0)
-         info_ptr->bit_depth = png_ptr->user_transform_depth;
-
-      if (png_ptr->user_transform_channels != 0)
-         info_ptr->channels = png_ptr->user_transform_channels;
-   }
-#endif
-
-   info_ptr->pixel_depth = (png_byte)(info_ptr->channels *
-       info_ptr->bit_depth);
-
-   info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, info_ptr->width);
-
-   /* Adding in 1.5.4: cache the above value in png_struct so that we can later
-    * check in png_rowbytes that the user buffer won't get overwritten.  Note
-    * that the field is not always set - if png_read_update_info isn't called
-    * the application has to either not do any transforms or get the calculation
-    * right itself.
-    */
-   png_ptr->info_rowbytes = info_ptr->rowbytes;
-
-#ifndef PNG_READ_EXPAND_SUPPORTED
-   if (png_ptr != NULL)
-      return;
-#endif
-}
-
-#ifdef PNG_READ_PACK_SUPPORTED
-/* Unpack pixels of 1, 2, or 4 bits per pixel into 1 byte per pixel,
- * without changing the actual values.  Thus, if you had a row with
- * a bit depth of 1, you would end up with bytes that only contained
- * the numbers 0 or 1.  If you would rather they contain 0 and 255, use
- * png_do_shift() after this.
- */
-static void
-png_do_unpack(png_row_infop row_info, png_bytep row)
-{
-   png_debug(1, "in png_do_unpack");
-
-   if (row_info->bit_depth < 8)
-   {
-      png_uint_32 i;
-      png_uint_32 row_width=row_info->width;
-
-      switch (row_info->bit_depth)
-      {
-         case 1:
-         {
-            png_bytep sp = row + (png_size_t)((row_width - 1) >> 3);
-            png_bytep dp = row + (png_size_t)row_width - 1;
-            png_uint_32 shift = 7U - ((row_width + 7U) & 0x07);
-            for (i = 0; i < row_width; i++)
-            {
-               *dp = (png_byte)((*sp >> shift) & 0x01);
-
-               if (shift == 7)
-               {
-                  shift = 0;
-                  sp--;
-               }
-
-               else
-                  shift++;
-
-               dp--;
-            }
-            break;
-         }
-
-         case 2:
-         {
-
-            png_bytep sp = row + (png_size_t)((row_width - 1) >> 2);
-            png_bytep dp = row + (png_size_t)row_width - 1;
-            png_uint_32 shift = ((3U - ((row_width + 3U) & 0x03)) << 1);
-            for (i = 0; i < row_width; i++)
-            {
-               *dp = (png_byte)((*sp >> shift) & 0x03);
-
-               if (shift == 6)
-               {
-                  shift = 0;
-                  sp--;
-               }
-
-               else
-                  shift += 2;
-
-               dp--;
-            }
-            break;
-         }
-
-         case 4:
-         {
-            png_bytep sp = row + (png_size_t)((row_width - 1) >> 1);
-            png_bytep dp = row + (png_size_t)row_width - 1;
-            png_uint_32 shift = ((1U - ((row_width + 1U) & 0x01)) << 2);
-            for (i = 0; i < row_width; i++)
-            {
-               *dp = (png_byte)((*sp >> shift) & 0x0f);
-
-               if (shift == 4)
-               {
-                  shift = 0;
-                  sp--;
-               }
-
-               else
-                  shift = 4;
-
-               dp--;
-            }
-            break;
-         }
-
-         default:
-            break;
-      }
-      row_info->bit_depth = 8;
-      row_info->pixel_depth = (png_byte)(8 * row_info->channels);
-      row_info->rowbytes = row_width * row_info->channels;
-   }
-}
-#endif
-
-#ifdef PNG_READ_SHIFT_SUPPORTED
-/* Reverse the effects of png_do_shift.  This routine merely shifts the
- * pixels back to their significant bits values.  Thus, if you have
- * a row of bit depth 8, but only 5 are significant, this will shift
- * the values back to 0 through 31.
- */
-static void
-png_do_unshift(png_row_infop row_info, png_bytep row,
-    png_const_color_8p sig_bits)
-{
-   int color_type;
-
-   png_debug(1, "in png_do_unshift");
-
-   /* The palette case has already been handled in the _init routine. */
-   color_type = row_info->color_type;
-
-   if (color_type != PNG_COLOR_TYPE_PALETTE)
-   {
-      int shift[4];
-      int channels = 0;
-      int bit_depth = row_info->bit_depth;
-
-      if ((color_type & PNG_COLOR_MASK_COLOR) != 0)
-      {
-         shift[channels++] = bit_depth - sig_bits->red;
-         shift[channels++] = bit_depth - sig_bits->green;
-         shift[channels++] = bit_depth - sig_bits->blue;
-      }
-
-      else
-      {
-         shift[channels++] = bit_depth - sig_bits->gray;
-      }
-
-      if ((color_type & PNG_COLOR_MASK_ALPHA) != 0)
-      {
-         shift[channels++] = bit_depth - sig_bits->alpha;
-      }
-
-      {
-         int c, have_shift;
-
-         for (c = have_shift = 0; c < channels; ++c)
-         {
-            /* A shift of more than the bit depth is an error condition but it
-             * gets ignored here.
-             */
-            if (shift[c] <= 0 || shift[c] >= bit_depth)
-               shift[c] = 0;
-
-            else
-               have_shift = 1;
-         }
-
-         if (have_shift == 0)
-            return;
-      }
-
-      switch (bit_depth)
-      {
-         default:
-         /* Must be 1bpp gray: should not be here! */
-            /* NOTREACHED */
-            break;
-
-         case 2:
-         /* Must be 2bpp gray */
-         /* assert(channels == 1 && shift[0] == 1) */
-         {
-            png_bytep bp = row;
-            png_bytep bp_end = bp + row_info->rowbytes;
-
-            while (bp < bp_end)
-            {
-               int b = (*bp >> 1) & 0x55;
-               *bp++ = (png_byte)b;
-            }
-            break;
-         }
-
-         case 4:
-         /* Must be 4bpp gray */
-         /* assert(channels == 1) */
-         {
-            png_bytep bp = row;
-            png_bytep bp_end = bp + row_info->rowbytes;
-            int gray_shift = shift[0];
-            int mask =  0xf >> gray_shift;
-
-            mask |= mask << 4;
-
-            while (bp < bp_end)
-            {
-               int b = (*bp >> gray_shift) & mask;
-               *bp++ = (png_byte)b;
-            }
-            break;
-         }
-
-         case 8:
-         /* Single byte components, G, GA, RGB, RGBA */
-         {
-            png_bytep bp = row;
-            png_bytep bp_end = bp + row_info->rowbytes;
-            int channel = 0;
-
-            while (bp < bp_end)
-            {
-               int b = *bp >> shift[channel];
-               if (++channel >= channels)
-                  channel = 0;
-               *bp++ = (png_byte)b;
-            }
-            break;
-         }
-
-#ifdef PNG_READ_16BIT_SUPPORTED
-         case 16:
-         /* Double byte components, G, GA, RGB, RGBA */
-         {
-            png_bytep bp = row;
-            png_bytep bp_end = bp + row_info->rowbytes;
-            int channel = 0;
-
-            while (bp < bp_end)
-            {
-               int value = (bp[0] << 8) + bp[1];
-
-               value >>= shift[channel];
-               if (++channel >= channels)
-                  channel = 0;
-               *bp++ = (png_byte)(value >> 8);
-               *bp++ = (png_byte)value;
-            }
-            break;
-         }
-#endif
-      }
-   }
-}
-#endif
-
-#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
-/* Scale rows of bit depth 16 down to 8 accurately */
-static void
-png_do_scale_16_to_8(png_row_infop row_info, png_bytep row)
-{
-   png_debug(1, "in png_do_scale_16_to_8");
-
-   if (row_info->bit_depth == 16)
-   {
-      png_bytep sp = row; /* source */
-      png_bytep dp = row; /* destination */
-      png_bytep ep = sp + row_info->rowbytes; /* end+1 */
-
-      while (sp < ep)
-      {
-         /* The input is an array of 16-bit components, these must be scaled to
-          * 8 bits each.  For a 16-bit value V the required value (from the PNG
-          * specification) is:
-          *
-          *    (V * 255) / 65535
-          *
-          * This reduces to round(V / 257), or floor((V + 128.5)/257)
-          *
-          * Represent V as the two byte value vhi.vlo.  Make a guess that the
-          * result is the top byte of V, vhi, then the correction to this value
-          * is:
-          *
-          *    error = floor(((V-vhi.vhi) + 128.5) / 257)
-          *          = floor(((vlo-vhi) + 128.5) / 257)
-          *
-          * This can be approximated using integer arithmetic (and a signed
-          * shift):
-          *
-          *    error = (vlo-vhi+128) >> 8;
-          *
-          * The approximate differs from the exact answer only when (vlo-vhi) is
-          * 128; it then gives a correction of +1 when the exact correction is
-          * 0.  This gives 128 errors.  The exact answer (correct for all 16-bit
-          * input values) is:
-          *
-          *    error = (vlo-vhi+128)*65535 >> 24;
-          *
-          * An alternative arithmetic calculation which also gives no errors is:
-          *
-          *    (V * 255 + 32895) >> 16
-          */
-
-         png_int_32 tmp = *sp++; /* must be signed! */
-         tmp += (((int)*sp++ - tmp + 128) * 65535) >> 24;
-         *dp++ = (png_byte)tmp;
-      }
-
-      row_info->bit_depth = 8;
-      row_info->pixel_depth = (png_byte)(8 * row_info->channels);
-      row_info->rowbytes = row_info->width * row_info->channels;
-   }
-}
-#endif
-
-#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
-static void
-/* Simply discard the low byte.  This was the default behavior prior
- * to libpng-1.5.4.
- */
-png_do_chop(png_row_infop row_info, png_bytep row)
-{
-   png_debug(1, "in png_do_chop");
-
-   if (row_info->bit_depth == 16)
-   {
-      png_bytep sp = row; /* source */
-      png_bytep dp = row; /* destination */
-      png_bytep ep = sp + row_info->rowbytes; /* end+1 */
-
-      while (sp < ep)
-      {
-         *dp++ = *sp;
-         sp += 2; /* skip low byte */
-      }
-
-      row_info->bit_depth = 8;
-      row_info->pixel_depth = (png_byte)(8 * row_info->channels);
-      row_info->rowbytes = row_info->width * row_info->channels;
-   }
-}
-#endif
-
-#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
-static void
-png_do_read_swap_alpha(png_row_infop row_info, png_bytep row)
-{
-   png_debug(1, "in png_do_read_swap_alpha");
-
-   {
-      png_uint_32 row_width = row_info->width;
-      if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
-      {
-         /* This converts from RGBA to ARGB */
-         if (row_info->bit_depth == 8)
-         {
-            png_bytep sp = row + row_info->rowbytes;
-            png_bytep dp = sp;
-            png_byte save;
-            png_uint_32 i;
-
-            for (i = 0; i < row_width; i++)
-            {
-               save = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = save;
-            }
-         }
-
-#ifdef PNG_READ_16BIT_SUPPORTED
-         /* This converts from RRGGBBAA to AARRGGBB */
-         else
-         {
-            png_bytep sp = row + row_info->rowbytes;
-            png_bytep dp = sp;
-            png_byte save[2];
-            png_uint_32 i;
-
-            for (i = 0; i < row_width; i++)
-            {
-               save[0] = *(--sp);
-               save[1] = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = save[0];
-               *(--dp) = save[1];
-            }
-         }
-#endif
-      }
-
-      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
-      {
-         /* This converts from GA to AG */
-         if (row_info->bit_depth == 8)
-         {
-            png_bytep sp = row + row_info->rowbytes;
-            png_bytep dp = sp;
-            png_byte save;
-            png_uint_32 i;
-
-            for (i = 0; i < row_width; i++)
-            {
-               save = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = save;
-            }
-         }
-
-#ifdef PNG_READ_16BIT_SUPPORTED
-         /* This converts from GGAA to AAGG */
-         else
-         {
-            png_bytep sp = row + row_info->rowbytes;
-            png_bytep dp = sp;
-            png_byte save[2];
-            png_uint_32 i;
-
-            for (i = 0; i < row_width; i++)
-            {
-               save[0] = *(--sp);
-               save[1] = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = save[0];
-               *(--dp) = save[1];
-            }
-         }
-#endif
-      }
-   }
-}
-#endif
-
-#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
-static void
-png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
-{
-   png_uint_32 row_width;
-   png_debug(1, "in png_do_read_invert_alpha");
-
-   row_width = row_info->width;
-   if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
-   {
-      if (row_info->bit_depth == 8)
-      {
-         /* This inverts the alpha channel in RGBA */
-         png_bytep sp = row + row_info->rowbytes;
-         png_bytep dp = sp;
-         png_uint_32 i;
-
-         for (i = 0; i < row_width; i++)
-         {
-            *(--dp) = (png_byte)(255 - *(--sp));
-
-/*          This does nothing:
-            *(--dp) = *(--sp);
-            *(--dp) = *(--sp);
-            *(--dp) = *(--sp);
-            We can replace it with:
-*/
-            sp-=3;
-            dp=sp;
-         }
-      }
-
-#ifdef PNG_READ_16BIT_SUPPORTED
-      /* This inverts the alpha channel in RRGGBBAA */
-      else
-      {
-         png_bytep sp = row + row_info->rowbytes;
-         png_bytep dp = sp;
-         png_uint_32 i;
-
-         for (i = 0; i < row_width; i++)
-         {
-            *(--dp) = (png_byte)(255 - *(--sp));
-            *(--dp) = (png_byte)(255 - *(--sp));
-
-/*          This does nothing:
-            *(--dp) = *(--sp);
-            *(--dp) = *(--sp);
-            *(--dp) = *(--sp);
-            *(--dp) = *(--sp);
-            *(--dp) = *(--sp);
-            *(--dp) = *(--sp);
-            We can replace it with:
-*/
-            sp-=6;
-            dp=sp;
-         }
-      }
-#endif
-   }
-   else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
-   {
-      if (row_info->bit_depth == 8)
-      {
-         /* This inverts the alpha channel in GA */
-         png_bytep sp = row + row_info->rowbytes;
-         png_bytep dp = sp;
-         png_uint_32 i;
-
-         for (i = 0; i < row_width; i++)
-         {
-            *(--dp) = (png_byte)(255 - *(--sp));
-            *(--dp) = *(--sp);
-         }
-      }
-
-#ifdef PNG_READ_16BIT_SUPPORTED
-      else
-      {
-         /* This inverts the alpha channel in GGAA */
-         png_bytep sp  = row + row_info->rowbytes;
-         png_bytep dp = sp;
-         png_uint_32 i;
-
-         for (i = 0; i < row_width; i++)
-         {
-            *(--dp) = (png_byte)(255 - *(--sp));
-            *(--dp) = (png_byte)(255 - *(--sp));
-/*
-            *(--dp) = *(--sp);
-            *(--dp) = *(--sp);
-*/
-            sp-=2;
-            dp=sp;
-         }
-      }
-#endif
-   }
-}
-#endif
-
-#ifdef PNG_READ_FILLER_SUPPORTED
-/* Add filler channel if we have RGB color */
-static void
-png_do_read_filler(png_row_infop row_info, png_bytep row,
-    png_uint_32 filler, png_uint_32 flags)
-{
-   png_uint_32 i;
-   png_uint_32 row_width = row_info->width;
-
-#ifdef PNG_READ_16BIT_SUPPORTED
-   png_byte hi_filler = (png_byte)(filler>>8);
-#endif
-   png_byte lo_filler = (png_byte)filler;
-
-   png_debug(1, "in png_do_read_filler");
-
-   if (
-       row_info->color_type == PNG_COLOR_TYPE_GRAY)
-   {
-      if (row_info->bit_depth == 8)
-      {
-         if ((flags & PNG_FLAG_FILLER_AFTER) != 0)
-         {
-            /* This changes the data from G to GX */
-            png_bytep sp = row + (png_size_t)row_width;
-            png_bytep dp =  sp + (png_size_t)row_width;
-            for (i = 1; i < row_width; i++)
-            {
-               *(--dp) = lo_filler;
-               *(--dp) = *(--sp);
-            }
-            *(--dp) = lo_filler;
-            row_info->channels = 2;
-            row_info->pixel_depth = 16;
-            row_info->rowbytes = row_width * 2;
-         }
-
-         else
-         {
-            /* This changes the data from G to XG */
-            png_bytep sp = row + (png_size_t)row_width;
-            png_bytep dp = sp  + (png_size_t)row_width;
-            for (i = 0; i < row_width; i++)
-            {
-               *(--dp) = *(--sp);
-               *(--dp) = lo_filler;
-            }
-            row_info->channels = 2;
-            row_info->pixel_depth = 16;
-            row_info->rowbytes = row_width * 2;
-         }
-      }
-
-#ifdef PNG_READ_16BIT_SUPPORTED
-      else if (row_info->bit_depth == 16)
-      {
-         if ((flags & PNG_FLAG_FILLER_AFTER) != 0)
-         {
-            /* This changes the data from GG to GGXX */
-            png_bytep sp = row + (png_size_t)row_width * 2;
-            png_bytep dp = sp  + (png_size_t)row_width * 2;
-            for (i = 1; i < row_width; i++)
-            {
-               *(--dp) = lo_filler;
-               *(--dp) = hi_filler;
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-            }
-            *(--dp) = lo_filler;
-            *(--dp) = hi_filler;
-            row_info->channels = 2;
-            row_info->pixel_depth = 32;
-            row_info->rowbytes = row_width * 4;
-         }
-
-         else
-         {
-            /* This changes the data from GG to XXGG */
-            png_bytep sp = row + (png_size_t)row_width * 2;
-            png_bytep dp = sp  + (png_size_t)row_width * 2;
-            for (i = 0; i < row_width; i++)
-            {
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = lo_filler;
-               *(--dp) = hi_filler;
-            }
-            row_info->channels = 2;
-            row_info->pixel_depth = 32;
-            row_info->rowbytes = row_width * 4;
-         }
-      }
-#endif
-   } /* COLOR_TYPE == GRAY */
-   else if (row_info->color_type == PNG_COLOR_TYPE_RGB)
-   {
-      if (row_info->bit_depth == 8)
-      {
-         if ((flags & PNG_FLAG_FILLER_AFTER) != 0)
-         {
-            /* This changes the data from RGB to RGBX */
-            png_bytep sp = row + (png_size_t)row_width * 3;
-            png_bytep dp = sp  + (png_size_t)row_width;
-            for (i = 1; i < row_width; i++)
-            {
-               *(--dp) = lo_filler;
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-            }
-            *(--dp) = lo_filler;
-            row_info->channels = 4;
-            row_info->pixel_depth = 32;
-            row_info->rowbytes = row_width * 4;
-         }
-
-         else
-         {
-            /* This changes the data from RGB to XRGB */
-            png_bytep sp = row + (png_size_t)row_width * 3;
-            png_bytep dp = sp + (png_size_t)row_width;
-            for (i = 0; i < row_width; i++)
-            {
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = lo_filler;
-            }
-            row_info->channels = 4;
-            row_info->pixel_depth = 32;
-            row_info->rowbytes = row_width * 4;
-         }
-      }
-
-#ifdef PNG_READ_16BIT_SUPPORTED
-      else if (row_info->bit_depth == 16)
-      {
-         if ((flags & PNG_FLAG_FILLER_AFTER) != 0)
-         {
-            /* This changes the data from RRGGBB to RRGGBBXX */
-            png_bytep sp = row + (png_size_t)row_width * 6;
-            png_bytep dp = sp  + (png_size_t)row_width * 2;
-            for (i = 1; i < row_width; i++)
-            {
-               *(--dp) = lo_filler;
-               *(--dp) = hi_filler;
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-            }
-            *(--dp) = lo_filler;
-            *(--dp) = hi_filler;
-            row_info->channels = 4;
-            row_info->pixel_depth = 64;
-            row_info->rowbytes = row_width * 8;
-         }
-
-         else
-         {
-            /* This changes the data from RRGGBB to XXRRGGBB */
-            png_bytep sp = row + (png_size_t)row_width * 6;
-            png_bytep dp = sp  + (png_size_t)row_width * 2;
-            for (i = 0; i < row_width; i++)
-            {
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = *(--sp);
-               *(--dp) = lo_filler;
-               *(--dp) = hi_filler;
-            }
-
-            row_info->channels = 4;
-            row_info->pixel_depth = 64;
-            row_info->rowbytes = row_width * 8;
-         }
-      }
-#endif
-   } /* COLOR_TYPE == RGB */
-}
-#endif
-
-#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
-/* Expand grayscale files to RGB, with or without alpha */
-static void
-png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
-{
-   png_uint_32 i;
-   png_uint_32 row_width = row_info->width;
-
-   png_debug(1, "in png_do_gray_to_rgb");
-
-   if (row_info->bit_depth >= 8 &&
-       (row_info->color_type & PNG_COLOR_MASK_COLOR) == 0)
-   {
-      if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
-      {
-         if (row_info->bit_depth == 8)
-         {
-            /* This changes G to RGB */
-            png_bytep sp = row + (png_size_t)row_width - 1;
-            png_bytep dp = sp  + (png_size_t)row_width * 2;
-            for (i = 0; i < row_width; i++)
-            {
-               *(dp--) = *sp;
-               *(dp--) = *sp;
-               *(dp--) = *(sp--);
-            }
-         }
-
-         else
-         {
-            /* This changes GG to RRGGBB */
-            png_bytep sp = row + (png_size_t)row_width * 2 - 1;
-            png_bytep dp = sp  + (png_size_t)row_width * 4;
-            for (i = 0; i < row_width; i++)
-            {
-               *(dp--) = *sp;
-               *(dp--) = *(sp - 1);
-               *(dp--) = *sp;
-               *(dp--) = *(sp - 1);
-               *(dp--) = *(sp--);
-               *(dp--) = *(sp--);
-            }
-         }
-      }
-
-      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
-      {
-         if (row_info->bit_depth == 8)
-         {
-            /* This changes GA to RGBA */
-            png_bytep sp = row + (png_size_t)row_width * 2 - 1;
-            png_bytep dp = sp  + (png_size_t)row_width * 2;
-            for (i = 0; i < row_width; i++)
-            {
-               *(dp--) = *(sp--);
-               *(dp--) = *sp;
-               *(dp--) = *sp;
-               *(dp--) = *(sp--);
-            }
-         }
-
-         else
-         {
-            /* This changes GGAA to RRGGBBAA */
-            png_bytep sp = row + (png_size_t)row_width * 4 - 1;
-            png_bytep dp = sp  + (png_size_t)row_width * 4;
-            for (i = 0; i < row_width; i++)
-            {
-               *(dp--) = *(sp--);
-               *(dp--) = *(sp--);
-               *(dp--) = *sp;
-               *(dp--) = *(sp - 1);
-               *(dp--) = *sp;
-               *(dp--) = *(sp - 1);
-               *(dp--) = *(sp--);
-               *(dp--) = *(sp--);
-            }
-         }
-      }
-      row_info->channels = (png_byte)(row_info->channels + 2);
-      row_info->color_type |= PNG_COLOR_MASK_COLOR;
-      row_info->pixel_depth = (png_byte)(row_info->channels *
-          row_info->bit_depth);
-      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
-   }
-}
-#endif
-
-#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-/* Reduce RGB files to grayscale, with or without alpha
- * using the equation given in Poynton's ColorFAQ of 1998-01-04 at
- * <http://www.inforamp.net/~poynton/>  (THIS LINK IS DEAD June 2008 but
- * versions dated 1998 through November 2002 have been archived at
- * https://web.archive.org/web/20000816232553/www.inforamp.net/
- * ~poynton/notes/colour_and_gamma/ColorFAQ.txt )
- * Charles Poynton poynton at poynton.com
- *
- *     Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
- *
- *  which can be expressed with integers as
- *
- *     Y = (6969 * R + 23434 * G + 2365 * B)/32768
- *
- * Poynton's current link (as of January 2003 through July 2011):
- * <http://www.poynton.com/notes/colour_and_gamma/>
- * has changed the numbers slightly:
- *
- *     Y = 0.2126*R + 0.7152*G + 0.0722*B
- *
- *  which can be expressed with integers as
- *
- *     Y = (6966 * R + 23436 * G + 2366 * B)/32768
- *
- *  Historically, however, libpng uses numbers derived from the ITU-R Rec 709
- *  end point chromaticities and the D65 white point.  Depending on the
- *  precision used for the D65 white point this produces a variety of different
- *  numbers, however if the four decimal place value used in ITU-R Rec 709 is
- *  used (0.3127,0.3290) the Y calculation would be:
- *
- *     Y = (6968 * R + 23435 * G + 2366 * B)/32768
- *
- *  While this is correct the rounding results in an overflow for white, because
- *  the sum of the rounded coefficients is 32769, not 32768.  Consequently
- *  libpng uses, instead, the closest non-overflowing approximation:
- *
- *     Y = (6968 * R + 23434 * G + 2366 * B)/32768
- *
- *  Starting with libpng-1.5.5, if the image being converted has a cHRM chunk
- *  (including an sRGB chunk) then the chromaticities are used to calculate the
- *  coefficients.  See the chunk handling in pngrutil.c for more information.
- *
- *  In all cases the calculation is to be done in a linear colorspace.  If no
- *  gamma information is available to correct the encoding of the original RGB
- *  values this results in an implicit assumption that the original PNG RGB
- *  values were linear.
- *
- *  Other integer coefficents can be used via png_set_rgb_to_gray().  Because
- *  the API takes just red and green coefficients the blue coefficient is
- *  calculated to make the sum 32768.  This will result in different rounding
- *  to that used above.
- */
-static int
-png_do_rgb_to_gray(png_structrp png_ptr, png_row_infop row_info, png_bytep row)
-
-{
-   int rgb_error = 0;
-
-   png_debug(1, "in png_do_rgb_to_gray");
-
-   if ((row_info->color_type & PNG_COLOR_MASK_PALETTE) == 0 &&
-       (row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
-   {
-      PNG_CONST png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff;
-      PNG_CONST png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff;
-      PNG_CONST png_uint_32 bc = 32768 - rc - gc;
-      PNG_CONST png_uint_32 row_width = row_info->width;
-      PNG_CONST int have_alpha =
-         (row_info->color_type & PNG_COLOR_MASK_ALPHA) != 0;
-
-      if (row_info->bit_depth == 8)
-      {
-#ifdef PNG_READ_GAMMA_SUPPORTED
-         /* Notice that gamma to/from 1 are not necessarily inverses (if
-          * there is an overall gamma correction).  Prior to 1.5.5 this code
-          * checked the linearized values for equality; this doesn't match
-          * the documentation, the original values must be checked.
-          */
-         if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL)
-         {
-            png_bytep sp = row;
-            png_bytep dp = row;
-            png_uint_32 i;
-
-            for (i = 0; i < row_width; i++)
-            {
-               png_byte red   = *(sp++);
-               png_byte green = *(sp++);
-               png_byte blue  = *(sp++);
-
-               if (red != green || red != blue)
-               {
-                  red = png_ptr->gamma_to_1[red];
-                  green = png_ptr->gamma_to_1[green];
-                  blue = png_ptr->gamma_to_1[blue];
-
-                  rgb_error |= 1;
-                  *(dp++) = png_ptr->gamma_from_1[
-                      (rc*red + gc*green + bc*blue + 16384)>>15];
-               }
-
-               else
-               {
-                  /* If there is no overall correction the table will not be
-                   * set.
-                   */
-                  if (png_ptr->gamma_table != NULL)
-                     red = png_ptr->gamma_table[red];
-
-                  *(dp++) = red;
-               }
-
-               if (have_alpha != 0)
-                  *(dp++) = *(sp++);
-            }
-         }
-         else
-#endif
-         {
-            png_bytep sp = row;
-            png_bytep dp = row;
-            png_uint_32 i;
-
-            for (i = 0; i < row_width; i++)
-            {
-               png_byte red   = *(sp++);
-               png_byte green = *(sp++);
-               png_byte blue  = *(sp++);
-
-               if (red != green || red != blue)
-               {
-                  rgb_error |= 1;
-                  /* NOTE: this is the historical approach which simply
-                   * truncates the results.
-                   */
-                  *(dp++) = (png_byte)((rc*red + gc*green + bc*blue)>>15);
-               }
-
-               else
-                  *(dp++) = red;
-
-               if (have_alpha != 0)
-                  *(dp++) = *(sp++);
-            }
-         }
-      }
-
-      else /* RGB bit_depth == 16 */
-      {
-#ifdef PNG_READ_GAMMA_SUPPORTED
-         if (png_ptr->gamma_16_to_1 != NULL && png_ptr->gamma_16_from_1 != NULL)
-         {
-            png_bytep sp = row;
-            png_bytep dp = row;
-            png_uint_32 i;
-
-            for (i = 0; i < row_width; i++)
-            {
-               png_uint_16 red, green, blue, w;
-               png_byte hi,lo;
-
-               hi=*(sp)++; lo=*(sp)++; red   = (png_uint_16)((hi << 8) | (lo));
-               hi=*(sp)++; lo=*(sp)++; green = (png_uint_16)((hi << 8) | (lo));
-               hi=*(sp)++; lo=*(sp)++; blue  = (png_uint_16)((hi << 8) | (lo));
-
-               if (red == green && red == blue)
-               {
-                  if (png_ptr->gamma_16_table != NULL)
-                     w = png_ptr->gamma_16_table[(red & 0xff)
-                         >> png_ptr->gamma_shift][red >> 8];
-
-                  else
-                     w = red;
-               }
-
-               else
-               {
-                  png_uint_16 red_1   = png_ptr->gamma_16_to_1[(red & 0xff)
-                      >> png_ptr->gamma_shift][red>>8];
-                  png_uint_16 green_1 =
-                      png_ptr->gamma_16_to_1[(green & 0xff) >>
-                      png_ptr->gamma_shift][green>>8];
-                  png_uint_16 blue_1  = png_ptr->gamma_16_to_1[(blue & 0xff)
-                      >> png_ptr->gamma_shift][blue>>8];
-                  png_uint_16 gray16  = (png_uint_16)((rc*red_1 + gc*green_1
-                      + bc*blue_1 + 16384)>>15);
-                  w = png_ptr->gamma_16_from_1[(gray16 & 0xff) >>
-                      png_ptr->gamma_shift][gray16 >> 8];
-                  rgb_error |= 1;
-               }
-
-               *(dp++) = (png_byte)((w>>8) & 0xff);
-               *(dp++) = (png_byte)(w & 0xff);
-
-               if (have_alpha != 0)
-               {
-                  *(dp++) = *(sp++);
-                  *(dp++) = *(sp++);
-               }
-            }
-         }
-         else
-#endif
-         {
-            png_bytep sp = row;
-            png_bytep dp = row;
-            png_uint_32 i;
-
-            for (i = 0; i < row_width; i++)
-            {
-               png_uint_16 red, green, blue, gray16;
-               png_byte hi,lo;
-
-               hi=*(sp)++; lo=*(sp)++; red   = (png_uint_16)((hi << 8) | (lo));
-               hi=*(sp)++; lo=*(sp)++; green = (png_uint_16)((hi << 8) | (lo));
-               hi=*(sp)++; lo=*(sp)++; blue  = (png_uint_16)((hi << 8) | (lo));
-
-               if (red != green || red != blue)
-                  rgb_error |= 1;
-
-               /* From 1.5.5 in the 16-bit case do the accurate conversion even
-                * in the 'fast' case - this is because this is where the code
-                * ends up when handling linear 16-bit data.
-                */
-               gray16  = (png_uint_16)((rc*red + gc*green + bc*blue + 16384) >>
-                  15);
-               *(dp++) = (png_byte)((gray16 >> 8) & 0xff);
-               *(dp++) = (png_byte)(gray16 & 0xff);
-
-               if (have_alpha != 0)
-               {
-                  *(dp++) = *(sp++);
-                  *(dp++) = *(sp++);
-               }
-            }
-         }
-      }
-
-      row_info->channels = (png_byte)(row_info->channels - 2);
-      row_info->color_type = (png_byte)(row_info->color_type &
-          ~PNG_COLOR_MASK_COLOR);
-      row_info->pixel_depth = (png_byte)(row_info->channels *
-          row_info->bit_depth);
-      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
-   }
-   return rgb_error;
-}
-#endif
-
-#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
-   defined(PNG_READ_ALPHA_MODE_SUPPORTED)
-/* Replace any alpha or transparency with the supplied background color.
- * "background" is already in the screen gamma, while "background_1" is
- * at a gamma of 1.0.  Paletted files have already been taken care of.
- */
-static void
-png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
-{
-#ifdef PNG_READ_GAMMA_SUPPORTED
-   png_const_bytep gamma_table = png_ptr->gamma_table;
-   png_const_bytep gamma_from_1 = png_ptr->gamma_from_1;
-   png_const_bytep gamma_to_1 = png_ptr->gamma_to_1;
-   png_const_uint_16pp gamma_16 = png_ptr->gamma_16_table;
-   png_const_uint_16pp gamma_16_from_1 = png_ptr->gamma_16_from_1;
-   png_const_uint_16pp gamma_16_to_1 = png_ptr->gamma_16_to_1;
-   int gamma_shift = png_ptr->gamma_shift;
-   int optimize = (png_ptr->flags & PNG_FLAG_OPTIMIZE_ALPHA) != 0;
-#endif
-
-   png_bytep sp;
-   png_uint_32 i;
-   png_uint_32 row_width = row_info->width;
-   int shift;
-
-   png_debug(1, "in png_do_compose");
-
-   {
-      switch (row_info->color_type)
-      {
-         case PNG_COLOR_TYPE_GRAY:
-         {
-            switch (row_info->bit_depth)
-            {
-               case 1:
-               {
-                  sp = row;
-                  shift = 7;
-                  for (i = 0; i < row_width; i++)
-                  {
-                     if ((png_uint_16)((*sp >> shift) & 0x01)
-                        == png_ptr->trans_color.gray)
-                     {
-                        unsigned int tmp = *sp & (0x7f7f >> (7 - shift));
-                        tmp |=
-                            (unsigned int)(png_ptr->background.gray << shift);
-                        *sp = (png_byte)(tmp & 0xff);
-                     }
-
-                     if (shift == 0)
-                     {
-                        shift = 7;
-                        sp++;
-                     }
-
-                     else
-                        shift--;
-                  }
-                  break;
-               }
-
-               case 2:
-               {
-#ifdef PNG_READ_GAMMA_SUPPORTED
-                  if (gamma_table != NULL)
-                  {
-                     sp = row;
-                     shift = 6;
-                     for (i = 0; i < row_width; i++)
-                     {
-                        if ((png_uint_16)((*sp >> shift) & 0x03)
-                            == png_ptr->trans_color.gray)
-                        {
-                           unsigned int tmp = *sp & (0x3f3f >> (6 - shift));
-                           tmp |=
-                              (unsigned int)png_ptr->background.gray << shift;
-                           *sp = (png_byte)(tmp & 0xff);
-                        }
-
-                        else
-                        {
-                           unsigned int p = (*sp >> shift) & 0x03;
-                           unsigned int g = (gamma_table [p | (p << 2) |
-                               (p << 4) | (p << 6)] >> 6) & 0x03;
-                           unsigned int tmp = *sp & (0x3f3f >> (6 - shift));
-                           tmp |= (unsigned int)(g << shift);
-                           *sp = (png_byte)(tmp & 0xff);
-                        }
-
-                        if (shift == 0)
-                        {
-                           shift = 6;
-                           sp++;
-                        }
-
-                        else
-                           shift -= 2;
-                     }
-                  }
-
-                  else
-#endif
-                  {
-                     sp = row;
-                     shift = 6;
-                     for (i = 0; i < row_width; i++)
-                     {
-                        if ((png_uint_16)((*sp >> shift) & 0x03)
-                            == png_ptr->trans_color.gray)
-                        {
-                           unsigned int tmp = *sp & (0x3f3f >> (6 - shift));
-                           tmp |=
-                               (unsigned int)png_ptr->background.gray << shift;
-                           *sp = (png_byte)(tmp & 0xff);
-                        }
-
-                        if (shift == 0)
-                        {
-                           shift = 6;
-                           sp++;
-                        }
-
-                        else
-                           shift -= 2;
-                     }
-                  }
-                  break;
-               }
-
-               case 4:
-               {
-#ifdef PNG_READ_GAMMA_SUPPORTED
-                  if (gamma_table != NULL)
-                  {
-                     sp = row;
-                     shift = 4;
-                     for (i = 0; i < row_width; i++)
-                     {
-                        if ((png_uint_16)((*sp >> shift) & 0x0f)
-                            == png_ptr->trans_color.gray)
-                        {
-                           unsigned int tmp = *sp & (0x0f0f >> (4 - shift));
-                           tmp |=
-                              (unsigned int)(png_ptr->background.gray << shift);
-                           *sp = (png_byte)(tmp & 0xff);
-                        }
-
-                        else
-                        {
-                           unsigned int p = (*sp >> shift) & 0x0f;
-                           unsigned int g = (gamma_table[p | (p << 4)] >> 4) &
-                              0x0f;
-                           unsigned int tmp = *sp & (0x0f0f >> (4 - shift));
-                           tmp |= (unsigned int)(g << shift);
-                           *sp = (png_byte)(tmp & 0xff);
-                        }
-
-                        if (shift == 0)
-                        {
-                           shift = 4;
-                           sp++;
-                        }
-
-                        else
-                           shift -= 4;
-                     }
-                  }
-
-                  else
-#endif
-                  {
-                     sp = row;
-                     shift = 4;
-                     for (i = 0; i < row_width; i++)
-                     {
-                        if ((png_uint_16)((*sp >> shift) & 0x0f)
-                            == png_ptr->trans_color.gray)
-                        {
-                           unsigned int tmp = *sp & (0x0f0f >> (4 - shift));
-                           tmp |=
-                              (unsigned int)(png_ptr->background.gray << shift);
-                           *sp = (png_byte)(tmp & 0xff);
-                        }
-
-                        if (shift == 0)
-                        {
-                           shift = 4;
-                           sp++;
-                        }
-
-                        else
-                           shift -= 4;
-                     }
-                  }
-                  break;
-               }
-
-               case 8:
-               {
-#ifdef PNG_READ_GAMMA_SUPPORTED
-                  if (gamma_table != NULL)
-                  {
-                     sp = row;
-                     for (i = 0; i < row_width; i++, sp++)
-                     {
-                        if (*sp == png_ptr->trans_color.gray)
-                           *sp = (png_byte)png_ptr->background.gray;
-
-                        else
-                           *sp = gamma_table[*sp];
-                     }
-                  }
-                  else
-#endif
-                  {
-                     sp = row;
-                     for (i = 0; i < row_width; i++, sp++)
-                     {
-                        if (*sp == png_ptr->trans_color.gray)
-                           *sp = (png_byte)png_ptr->background.gray;
-                     }
-                  }
-                  break;
-               }
-
-               case 16:
-               {
-#ifdef PNG_READ_GAMMA_SUPPORTED
-                  if (gamma_16 != NULL)
-                  {
-                     sp = row;
-                     for (i = 0; i < row_width; i++, sp += 2)
-                     {
-                        png_uint_16 v;
-
-                        v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
-
-                        if (v == png_ptr->trans_color.gray)
-                        {
-                           /* Background is already in screen gamma */
-                           *sp = (png_byte)((png_ptr->background.gray >> 8)
-                                & 0xff);
-                           *(sp + 1) = (png_byte)(png_ptr->background.gray
-                                & 0xff);
-                        }
-
-                        else
-                        {
-                           v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
-                           *sp = (png_byte)((v >> 8) & 0xff);
-                           *(sp + 1) = (png_byte)(v & 0xff);
-                        }
-                     }
-                  }
-                  else
-#endif
-                  {
-                     sp = row;
-                     for (i = 0; i < row_width; i++, sp += 2)
-                     {
-                        png_uint_16 v;
-
-                        v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
-
-                        if (v == png_ptr->trans_color.gray)
-                        {
-                           *sp = (png_byte)((png_ptr->background.gray >> 8)
-                                & 0xff);
-                           *(sp + 1) = (png_byte)(png_ptr->background.gray
-                                & 0xff);
-                        }
-                     }
-                  }
-                  break;
-               }
-
-               default:
-                  break;
-            }
-            break;
-         }
-
-         case PNG_COLOR_TYPE_RGB:
-         {
-            if (row_info->bit_depth == 8)
-            {
-#ifdef PNG_READ_GAMMA_SUPPORTED
-               if (gamma_table != NULL)
-               {
-                  sp = row;
-                  for (i = 0; i < row_width; i++, sp += 3)
-                  {
-                     if (*sp == png_ptr->trans_color.red &&
-                         *(sp + 1) == png_ptr->trans_color.green &&
-                         *(sp + 2) == png_ptr->trans_color.blue)
-                     {
-                        *sp = (png_byte)png_ptr->background.red;
-                        *(sp + 1) = (png_byte)png_ptr->background.green;
-                        *(sp + 2) = (png_byte)png_ptr->background.blue;
-                     }
-
-                     else
-                     {
-                        *sp = gamma_table[*sp];
-                        *(sp + 1) = gamma_table[*(sp + 1)];
-                        *(sp + 2) = gamma_table[*(sp + 2)];
-                     }
-                  }
-               }
-               else
-#endif
-               {
-                  sp = row;
-                  for (i = 0; i < row_width; i++, sp += 3)
-                  {
-                     if (*sp == png_ptr->trans_color.red &&
-                         *(sp + 1) == png_ptr->trans_color.green &&
-                         *(sp + 2) == png_ptr->trans_color.blue)
-                     {
-                        *sp = (png_byte)png_ptr->background.red;
-                        *(sp + 1) = (png_byte)png_ptr->background.green;
-                        *(sp + 2) = (png_byte)png_ptr->background.blue;
-                     }
-                  }
-               }
-            }
-            else /* if (row_info->bit_depth == 16) */
-            {
-#ifdef PNG_READ_GAMMA_SUPPORTED
-               if (gamma_16 != NULL)
-               {
-                  sp = row;
-                  for (i = 0; i < row_width; i++, sp += 6)
-                  {
-                     png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
-
-                     png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8)
-                         + *(sp + 3));
-
-                     png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
-                         + *(sp + 5));
-
-                     if (r == png_ptr->trans_color.red &&
-                         g == png_ptr->trans_color.green &&
-                         b == png_ptr->trans_color.blue)
-                     {
-                        /* Background is already in screen gamma */
-                        *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
-                        *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
-                        *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
-                                & 0xff);
-                        *(sp + 3) = (png_byte)(png_ptr->background.green
-                                & 0xff);
-                        *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
-                                & 0xff);
-                        *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
-                     }
-
-                     else
-                     {
-                        png_uint_16 v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
-                        *sp = (png_byte)((v >> 8) & 0xff);
-                        *(sp + 1) = (png_byte)(v & 0xff);
-
-                        v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)];
-                        *(sp + 2) = (png_byte)((v >> 8) & 0xff);
-                        *(sp + 3) = (png_byte)(v & 0xff);
-
-                        v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)];
-                        *(sp + 4) = (png_byte)((v >> 8) & 0xff);
-                        *(sp + 5) = (png_byte)(v & 0xff);
-                     }
-                  }
-               }
-
-               else
-#endif
-               {
-                  sp = row;
-                  for (i = 0; i < row_width; i++, sp += 6)
-                  {
-                     png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
-
-                     png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8)
-                         + *(sp + 3));
-
-                     png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
-                         + *(sp + 5));
-
-                     if (r == png_ptr->trans_color.red &&
-                         g == png_ptr->trans_color.green &&
-                         b == png_ptr->trans_color.blue)
-                     {
-                        *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
-                        *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
-                        *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
-                                & 0xff);
-                        *(sp + 3) = (png_byte)(png_ptr->background.green
-                                & 0xff);
-                        *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
-                                & 0xff);
-                        *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
-                     }
-                  }
-               }
-            }
-            break;
-         }
-
-         case PNG_COLOR_TYPE_GRAY_ALPHA:
-         {
-            if (row_info->bit_depth == 8)
-            {
-#ifdef PNG_READ_GAMMA_SUPPORTED
-               if (gamma_to_1 != NULL && gamma_from_1 != NULL &&
-                   gamma_table != NULL)
-               {
-                  sp = row;
-                  for (i = 0; i < row_width; i++, sp += 2)
-                  {
-                     png_uint_16 a = *(sp + 1);
-
-                     if (a == 0xff)
-                        *sp = gamma_table[*sp];
-
-                     else if (a == 0)
-                     {
-                        /* Background is already in screen gamma */
-                        *sp = (png_byte)png_ptr->background.gray;
-                     }
-
-                     else
-                     {
-                        png_byte v, w;
-
-                        v = gamma_to_1[*sp];
-                        png_composite(w, v, a, png_ptr->background_1.gray);
-                        if (optimize == 0)
-                           w = gamma_from_1[w];
-                        *sp = w;
-                     }
-                  }
-               }
-               else
-#endif
-               {
-                  sp = row;
-                  for (i = 0; i < row_width; i++, sp += 2)
-                  {
-                     png_byte a = *(sp + 1);
-
-                     if (a == 0)
-                        *sp = (png_byte)png_ptr->background.gray;
-
-                     else if (a < 0xff)
-                        png_composite(*sp, *sp, a, png_ptr->background.gray);
-                  }
-               }
-            }
-            else /* if (png_ptr->bit_depth == 16) */
-            {
-#ifdef PNG_READ_GAMMA_SUPPORTED
-               if (gamma_16 != NULL && gamma_16_from_1 != NULL &&
-                   gamma_16_to_1 != NULL)
-               {
-                  sp = row;
-                  for (i = 0; i < row_width; i++, sp += 4)
-                  {
-                     png_uint_16 a = (png_uint_16)(((*(sp + 2)) << 8)
-                         + *(sp + 3));
-
-                     if (a == (png_uint_16)0xffff)
-                     {
-                        png_uint_16 v;
-
-                        v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
-                        *sp = (png_byte)((v >> 8) & 0xff);
-                        *(sp + 1) = (png_byte)(v & 0xff);
-                     }
-
-                     else if (a == 0)
-                     {
-                        /* Background is already in screen gamma */
-                        *sp = (png_byte)((png_ptr->background.gray >> 8)
-                                & 0xff);
-                        *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff);
-                     }
-
-                     else
-                     {
-                        png_uint_16 g, v, w;
-
-                        g = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
-                        png_composite_16(v, g, a, png_ptr->background_1.gray);
-                        if (optimize != 0)
-                           w = v;
-                        else
-                           w = gamma_16_from_1[(v & 0xff) >>
-                               gamma_shift][v >> 8];
-                        *sp = (png_byte)((w >> 8) & 0xff);
-                        *(sp + 1) = (png_byte)(w & 0xff);
-                     }
-                  }
-               }
-               else
-#endif
-               {
-                  sp = row;
-                  for (i = 0; i < row_width; i++, sp += 4)
-                  {
-                     png_uint_16 a = (png_uint_16)(((*(sp + 2)) << 8)
-                         + *(sp + 3));
-
-                     if (a == 0)
-                     {
-                        *sp = (png_byte)((png_ptr->background.gray >> 8)
-                                & 0xff);
-                        *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff);
-                     }
-
-                     else if (a < 0xffff)
-                     {
-                        png_uint_16 g, v;
-
-                        g = (png_uint_16)(((*sp) << 8) + *(sp + 1));
-                        png_composite_16(v, g, a, png_ptr->background.gray);
-                        *sp = (png_byte)((v >> 8) & 0xff);
-                        *(sp + 1) = (png_byte)(v & 0xff);
-                     }
-                  }
-               }
-            }
-            break;
-         }
-
-         case PNG_COLOR_TYPE_RGB_ALPHA:
-         {
-            if (row_info->bit_depth == 8)
-            {
-#ifdef PNG_READ_GAMMA_SUPPORTED
-               if (gamma_to_1 != NULL && gamma_from_1 != NULL &&
-                   gamma_table != NULL)
-               {
-                  sp = row;
-                  for (i = 0; i < row_width; i++, sp += 4)
-                  {
-                     png_byte a = *(sp + 3);
-
-                     if (a == 0xff)
-                     {
-                        *sp = gamma_table[*sp];
-                        *(sp + 1) = gamma_table[*(sp + 1)];
-                        *(sp + 2) = gamma_table[*(sp + 2)];
-                     }
-
-                     else if (a == 0)
-                     {
-                        /* Background is already in screen gamma */
-                        *sp = (png_byte)png_ptr->background.red;
-                        *(sp + 1) = (png_byte)png_ptr->background.green;
-                        *(sp + 2) = (png_byte)png_ptr->background.blue;
-                     }
-
-                     else
-                     {
-                        png_byte v, w;
-
-                        v = gamma_to_1[*sp];
-                        png_composite(w, v, a, png_ptr->background_1.red);
-                        if (optimize == 0) w = gamma_from_1[w];
-                        *sp = w;
-
-                        v = gamma_to_1[*(sp + 1)];
-                        png_composite(w, v, a, png_ptr->background_1.green);
-                        if (optimize == 0) w = gamma_from_1[w];
-                        *(sp + 1) = w;
-
-                        v = gamma_to_1[*(sp + 2)];
-                        png_composite(w, v, a, png_ptr->background_1.blue);
-                        if (optimize == 0) w = gamma_from_1[w];
-                        *(sp + 2) = w;
-                     }
-                  }
-               }
-               else
-#endif
-               {
-                  sp = row;
-                  for (i = 0; i < row_width; i++, sp += 4)
-                  {
-                     png_byte a = *(sp + 3);
-
-                     if (a == 0)
-                     {
-                        *sp = (png_byte)png_ptr->background.red;
-                        *(sp + 1) = (png_byte)png_ptr->background.green;
-                        *(sp + 2) = (png_byte)png_ptr->background.blue;
-                     }
-
-                     else if (a < 0xff)
-                     {
-                        png_composite(*sp, *sp, a, png_ptr->background.red);
-
-                        png_composite(*(sp + 1), *(sp + 1), a,
-                            png_ptr->background.green);
-
-                        png_composite(*(sp + 2), *(sp + 2), a,
-                            png_ptr->background.blue);
-                     }
-                  }
-               }
-            }
-            else /* if (row_info->bit_depth == 16) */
-            {
-#ifdef PNG_READ_GAMMA_SUPPORTED
-               if (gamma_16 != NULL && gamma_16_from_1 != NULL &&
-                   gamma_16_to_1 != NULL)
-               {
-                  sp = row;
-                  for (i = 0; i < row_width; i++, sp += 8)
-                  {
-                     png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6))
-                         << 8) + (png_uint_16)(*(sp + 7)));
-
-                     if (a == (png_uint_16)0xffff)
-                     {
-                        png_uint_16 v;
-
-                        v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
-                        *sp = (png_byte)((v >> 8) & 0xff);
-                        *(sp + 1) = (png_byte)(v & 0xff);
-
-                        v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)];
-                        *(sp + 2) = (png_byte)((v >> 8) & 0xff);
-                        *(sp + 3) = (png_byte)(v & 0xff);
-
-                        v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)];
-                        *(sp + 4) = (png_byte)((v >> 8) & 0xff);
-                        *(sp + 5) = (png_byte)(v & 0xff);
-                     }
-
-                     else if (a == 0)
-                     {
-                        /* Background is already in screen gamma */
-                        *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
-                        *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
-                        *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
-                                & 0xff);
-                        *(sp + 3) = (png_byte)(png_ptr->background.green
-                                & 0xff);
-                        *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
-                                & 0xff);
-                        *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
-                     }
-
-                     else
-                     {
-                        png_uint_16 v, w;
-
-                        v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
-                        png_composite_16(w, v, a, png_ptr->background_1.red);
-                        if (optimize == 0)
-                           w = gamma_16_from_1[((w & 0xff) >> gamma_shift)][w >>
-                                8];
-                        *sp = (png_byte)((w >> 8) & 0xff);
-                        *(sp + 1) = (png_byte)(w & 0xff);
-
-                        v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)];
-                        png_composite_16(w, v, a, png_ptr->background_1.green);
-                        if (optimize == 0)
-                           w = gamma_16_from_1[((w & 0xff) >> gamma_shift)][w >>
-                                8];
-
-                        *(sp + 2) = (png_byte)((w >> 8) & 0xff);
-                        *(sp + 3) = (png_byte)(w & 0xff);
-
-                        v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)];
-                        png_composite_16(w, v, a, png_ptr->background_1.blue);
-                        if (optimize == 0)
-                           w = gamma_16_from_1[((w & 0xff) >> gamma_shift)][w >>
-                                8];
-
-                        *(sp + 4) = (png_byte)((w >> 8) & 0xff);
-                        *(sp + 5) = (png_byte)(w & 0xff);
-                     }
-                  }
-               }
-
-               else
-#endif
-               {
-                  sp = row;
-                  for (i = 0; i < row_width; i++, sp += 8)
-                  {
-                     png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6))
-                         << 8) + (png_uint_16)(*(sp + 7)));
-
-                     if (a == 0)
-                     {
-                        *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
-                        *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
-                        *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
-                                & 0xff);
-                        *(sp + 3) = (png_byte)(png_ptr->background.green
-                                & 0xff);
-                        *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
-                                & 0xff);
-                        *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
-                     }
-
-                     else if (a < 0xffff)
-                     {
-                        png_uint_16 v;
-
-                        png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
-                        png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8)
-                            + *(sp + 3));
-                        png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
-                            + *(sp + 5));
-
-                        png_composite_16(v, r, a, png_ptr->background.red);
-                        *sp = (png_byte)((v >> 8) & 0xff);
-                        *(sp + 1) = (png_byte)(v & 0xff);
-
-                        png_composite_16(v, g, a, png_ptr->background.green);
-                        *(sp + 2) = (png_byte)((v >> 8) & 0xff);
-                        *(sp + 3) = (png_byte)(v & 0xff);
-
-                        png_composite_16(v, b, a, png_ptr->background.blue);
-                        *(sp + 4) = (png_byte)((v >> 8) & 0xff);
-                        *(sp + 5) = (png_byte)(v & 0xff);
-                     }
-                  }
-               }
-            }
-            break;
-         }
-
-         default:
-            break;
-      }
-   }
-}
-#endif /* READ_BACKGROUND || READ_ALPHA_MODE */
-
-#ifdef PNG_READ_GAMMA_SUPPORTED
-/* Gamma correct the image, avoiding the alpha channel.  Make sure
- * you do this after you deal with the transparency issue on grayscale
- * or RGB images. If your bit depth is 8, use gamma_table, if it
- * is 16, use gamma_16_table and gamma_shift.  Build these with
- * build_gamma_table().
- */
-static void
-png_do_gamma(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
-{
-   png_const_bytep gamma_table = png_ptr->gamma_table;
-   png_const_uint_16pp gamma_16_table = png_ptr->gamma_16_table;
-   int gamma_shift = png_ptr->gamma_shift;
-
-   png_bytep sp;
-   png_uint_32 i;
-   png_uint_32 row_width=row_info->width;
-
-   png_debug(1, "in png_do_gamma");
-
-   if (((row_info->bit_depth <= 8 && gamma_table != NULL) ||
-       (row_info->bit_depth == 16 && gamma_16_table != NULL)))
-   {
-      switch (row_info->color_type)
-      {
-         case PNG_COLOR_TYPE_RGB:
-         {
-            if (row_info->bit_depth == 8)
-            {
-               sp = row;
-               for (i = 0; i < row_width; i++)
-               {
-                  *sp = gamma_table[*sp];
-                  sp++;
-                  *sp = gamma_table[*sp];
-                  sp++;
-                  *sp = gamma_table[*sp];
-                  sp++;
-               }
-            }
-
-            else /* if (row_info->bit_depth == 16) */
-            {
-               sp = row;
-               for (i = 0; i < row_width; i++)
-               {
-                  png_uint_16 v;
-
-                  v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
-                  *sp = (png_byte)((v >> 8) & 0xff);
-                  *(sp + 1) = (png_byte)(v & 0xff);
-                  sp += 2;
-
-                  v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
-                  *sp = (png_byte)((v >> 8) & 0xff);
-                  *(sp + 1) = (png_byte)(v & 0xff);
-                  sp += 2;
-
-                  v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
-                  *sp = (png_byte)((v >> 8) & 0xff);
-                  *(sp + 1) = (png_byte)(v & 0xff);
-                  sp += 2;
-               }
-            }
-            break;
-         }
-
-         case PNG_COLOR_TYPE_RGB_ALPHA:
-         {
-            if (row_info->bit_depth == 8)
-            {
-               sp = row;
-               for (i = 0; i < row_width; i++)
-               {
-                  *sp = gamma_table[*sp];
-                  sp++;
-
-                  *sp = gamma_table[*sp];
-                  sp++;
-
-                  *sp = gamma_table[*sp];
-                  sp++;
-
-                  sp++;
-               }
-            }
-
-            else /* if (row_info->bit_depth == 16) */
-            {
-               sp = row;
-               for (i = 0; i < row_width; i++)
-               {
-                  png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
-                  *sp = (png_byte)((v >> 8) & 0xff);
-                  *(sp + 1) = (png_byte)(v & 0xff);
-                  sp += 2;
-
-                  v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
-                  *sp = (png_byte)((v >> 8) & 0xff);
-                  *(sp + 1) = (png_byte)(v & 0xff);
-                  sp += 2;
-
-                  v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
-                  *sp = (png_byte)((v >> 8) & 0xff);
-                  *(sp + 1) = (png_byte)(v & 0xff);
-                  sp += 4;
-               }
-            }
-            break;
-         }
-
-         case PNG_COLOR_TYPE_GRAY_ALPHA:
-         {
-            if (row_info->bit_depth == 8)
-            {
-               sp = row;
-               for (i = 0; i < row_width; i++)
-               {
-                  *sp = gamma_table[*sp];
-                  sp += 2;
-               }
-            }
-
-            else /* if (row_info->bit_depth == 16) */
-            {
-               sp = row;
-               for (i = 0; i < row_width; i++)
-               {
-                  png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
-                  *sp = (png_byte)((v >> 8) & 0xff);
-                  *(sp + 1) = (png_byte)(v & 0xff);
-                  sp += 4;
-               }
-            }
-            break;
-         }
-
-         case PNG_COLOR_TYPE_GRAY:
-         {
-            if (row_info->bit_depth == 2)
-            {
-               sp = row;
-               for (i = 0; i < row_width; i += 4)
-               {
-                  int a = *sp & 0xc0;
-                  int b = *sp & 0x30;
-                  int c = *sp & 0x0c;
-                  int d = *sp & 0x03;
-
-                  *sp = (png_byte)(
-                      ((((int)gamma_table[a|(a>>2)|(a>>4)|(a>>6)])   ) & 0xc0)|
-                      ((((int)gamma_table[(b<<2)|b|(b>>2)|(b>>4)])>>2) & 0x30)|
-                      ((((int)gamma_table[(c<<4)|(c<<2)|c|(c>>2)])>>4) & 0x0c)|
-                      ((((int)gamma_table[(d<<6)|(d<<4)|(d<<2)|d])>>6) ));
-                  sp++;
-               }
-            }
-
-            if (row_info->bit_depth == 4)
-            {
-               sp = row;
-               for (i = 0; i < row_width; i += 2)
-               {
-                  int msb = *sp & 0xf0;
-                  int lsb = *sp & 0x0f;
-
-                  *sp = (png_byte)((((int)gamma_table[msb | (msb >> 4)]) & 0xf0)
-                      | (((int)gamma_table[(lsb << 4) | lsb]) >> 4));
-                  sp++;
-               }
-            }
-
-            else if (row_info->bit_depth == 8)
-            {
-               sp = row;
-               for (i = 0; i < row_width; i++)
-               {
-                  *sp = gamma_table[*sp];
-                  sp++;
-               }
-            }
-
-            else if (row_info->bit_depth == 16)
-            {
-               sp = row;
-               for (i = 0; i < row_width; i++)
-               {
-                  png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp];
-                  *sp = (png_byte)((v >> 8) & 0xff);
-                  *(sp + 1) = (png_byte)(v & 0xff);
-                  sp += 2;
-               }
-            }
-            break;
-         }
-
-         default:
-            break;
-      }
-   }
-}
-#endif
-
-#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
-/* Encode the alpha channel to the output gamma (the input channel is always
- * linear.)  Called only with color types that have an alpha channel.  Needs the
- * from_1 tables.
- */
-static void
-png_do_encode_alpha(png_row_infop row_info, png_bytep row, png_structrp png_ptr)
-{
-   png_uint_32 row_width = row_info->width;
-
-   png_debug(1, "in png_do_encode_alpha");
-
-   if ((row_info->color_type & PNG_COLOR_MASK_ALPHA) != 0)
-   {
-      if (row_info->bit_depth == 8)
-      {
-         PNG_CONST png_bytep table = png_ptr->gamma_from_1;
-
-         if (table != NULL)
-         {
-            PNG_CONST int step =
-               (row_info->color_type & PNG_COLOR_MASK_COLOR) ? 4 : 2;
-
-            /* The alpha channel is the last component: */
-            row += step - 1;
-
-            for (; row_width > 0; --row_width, row += step)
-               *row = table[*row];
-
-            return;
-         }
-      }
-
-      else if (row_info->bit_depth == 16)
-      {
-         PNG_CONST png_uint_16pp table = png_ptr->gamma_16_from_1;
-         PNG_CONST int gamma_shift = png_ptr->gamma_shift;
-
-         if (table != NULL)
-         {
-            PNG_CONST int step =
-               (row_info->color_type & PNG_COLOR_MASK_COLOR) ? 8 : 4;
-
-            /* The alpha channel is the last component: */
-            row += step - 2;
-
-            for (; row_width > 0; --row_width, row += step)
-            {
-               png_uint_16 v;
-
-               v = table[*(row + 1) >> gamma_shift][*row];
-               *row = (png_byte)((v >> 8) & 0xff);
-               *(row + 1) = (png_byte)(v & 0xff);
-            }
-
-            return;
-         }
-      }
-   }
-
-   /* Only get to here if called with a weird row_info; no harm has been done,
-    * so just issue a warning.
-    */
-   png_warning(png_ptr, "png_do_encode_alpha: unexpected call");
-}
-#endif
-
-#ifdef PNG_READ_EXPAND_SUPPORTED
-/* Expands a palette row to an RGB or RGBA row depending
- * upon whether you supply trans and num_trans.
- */
-static void
-png_do_expand_palette(png_row_infop row_info, png_bytep row,
-    png_const_colorp palette, png_const_bytep trans_alpha, int num_trans)
-{
-   int shift, value;
-   png_bytep sp, dp;
-   png_uint_32 i;
-   png_uint_32 row_width=row_info->width;
-
-   png_debug(1, "in png_do_expand_palette");
-
-   if (row_info->color_type == PNG_COLOR_TYPE_PALETTE)
-   {
-      if (row_info->bit_depth < 8)
-      {
-         switch (row_info->bit_depth)
-         {
-            case 1:
-            {
-               sp = row + (png_size_t)((row_width - 1) >> 3);
-               dp = row + (png_size_t)row_width - 1;
-               shift = 7 - (int)((row_width + 7) & 0x07);
-               for (i = 0; i < row_width; i++)
-               {
-                  if ((*sp >> shift) & 0x01)
-                     *dp = 1;
-
-                  else
-                     *dp = 0;
-
-                  if (shift == 7)
-                  {
-                     shift = 0;
-                     sp--;
-                  }
-
-                  else
-                     shift++;
-
-                  dp--;
-               }
-               break;
-            }
-
-            case 2:
-            {
-               sp = row + (png_size_t)((row_width - 1) >> 2);
-               dp = row + (png_size_t)row_width - 1;
-               shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
-               for (i = 0; i < row_width; i++)
-               {
-                  value = (*sp >> shift) & 0x03;
-                  *dp = (png_byte)value;
-                  if (shift == 6)
-                  {
-                     shift = 0;
-                     sp--;
-                  }
-
-                  else
-                     shift += 2;
-
-                  dp--;
-               }
-               break;
-            }
-
-            case 4:
-            {
-               sp = row + (png_size_t)((row_width - 1) >> 1);
-               dp = row + (png_size_t)row_width - 1;
-               shift = (int)((row_width & 0x01) << 2);
-               for (i = 0; i < row_width; i++)
-               {
-                  value = (*sp >> shift) & 0x0f;
-                  *dp = (png_byte)value;
-                  if (shift == 4)
-                  {
-                     shift = 0;
-                     sp--;
-                  }
-
-                  else
-                     shift += 4;
-
-                  dp--;
-               }
-               break;
-            }
-
-            default:
-               break;
-         }
-         row_info->bit_depth = 8;
-         row_info->pixel_depth = 8;
-         row_info->rowbytes = row_width;
-      }
-
-      if (row_info->bit_depth == 8)
-      {
-         {
-            if (num_trans > 0)
-            {
-               sp = row + (png_size_t)row_width - 1;
-               dp = row + ((png_size_t)row_width << 2) - 1;
-
-               for (i = 0; i < row_width; i++)
-               {
-                  if ((int)(*sp) >= num_trans)
-                     *dp-- = 0xff;
-
-                  else
-                     *dp-- = trans_alpha[*sp];
-
-                  *dp-- = palette[*sp].blue;
-                  *dp-- = palette[*sp].green;
-                  *dp-- = palette[*sp].red;
-                  sp--;
-               }
-               row_info->bit_depth = 8;
-               row_info->pixel_depth = 32;
-               row_info->rowbytes = row_width * 4;
-               row_info->color_type = 6;
-               row_info->channels = 4;
-            }
-
-            else
-            {
-               sp = row + (png_size_t)row_width - 1;
-               dp = row + (png_size_t)(row_width * 3) - 1;
-
-               for (i = 0; i < row_width; i++)
-               {
-                  *dp-- = palette[*sp].blue;
-                  *dp-- = palette[*sp].green;
-                  *dp-- = palette[*sp].red;
-                  sp--;
-               }
-
-               row_info->bit_depth = 8;
-               row_info->pixel_depth = 24;
-               row_info->rowbytes = row_width * 3;
-               row_info->color_type = 2;
-               row_info->channels = 3;
-            }
-         }
-      }
-   }
-}
-
-/* If the bit depth < 8, it is expanded to 8.  Also, if the already
- * expanded transparency value is supplied, an alpha channel is built.
- */
-static void
-png_do_expand(png_row_infop row_info, png_bytep row,
-    png_const_color_16p trans_color)
-{
-   int shift, value;
-   png_bytep sp, dp;
-   png_uint_32 i;
-   png_uint_32 row_width=row_info->width;
-
-   png_debug(1, "in png_do_expand");
-
-   {
-      if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
-      {
-         unsigned int gray = trans_color != NULL ? trans_color->gray : 0;
-
-         if (row_info->bit_depth < 8)
-         {
-            switch (row_info->bit_depth)
-            {
-               case 1:
-               {
-                  gray = (gray & 0x01) * 0xff;
-                  sp = row + (png_size_t)((row_width - 1) >> 3);
-                  dp = row + (png_size_t)row_width - 1;
-                  shift = 7 - (int)((row_width + 7) & 0x07);
-                  for (i = 0; i < row_width; i++)
-                  {
-                     if ((*sp >> shift) & 0x01)
-                        *dp = 0xff;
-
-                     else
-                        *dp = 0;
-
-                     if (shift == 7)
-                     {
-                        shift = 0;
-                        sp--;
-                     }
-
-                     else
-                        shift++;
-
-                     dp--;
-                  }
-                  break;
-               }
-
-               case 2:
-               {
-                  gray = (gray & 0x03) * 0x55;
-                  sp = row + (png_size_t)((row_width - 1) >> 2);
-                  dp = row + (png_size_t)row_width - 1;
-                  shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
-                  for (i = 0; i < row_width; i++)
-                  {
-                     value = (*sp >> shift) & 0x03;
-                     *dp = (png_byte)(value | (value << 2) | (value << 4) |
-                        (value << 6));
-                     if (shift == 6)
-                     {
-                        shift = 0;
-                        sp--;
-                     }
-
-                     else
-                        shift += 2;
-
-                     dp--;
-                  }
-                  break;
-               }
-
-               case 4:
-               {
-                  gray = (gray & 0x0f) * 0x11;
-                  sp = row + (png_size_t)((row_width - 1) >> 1);
-                  dp = row + (png_size_t)row_width - 1;
-                  shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
-                  for (i = 0; i < row_width; i++)
-                  {
-                     value = (*sp >> shift) & 0x0f;
-                     *dp = (png_byte)(value | (value << 4));
-                     if (shift == 4)
-                     {
-                        shift = 0;
-                        sp--;
-                     }
-
-                     else
-                        shift = 4;
-
-                     dp--;
-                  }
-                  break;
-               }
-
-               default:
-                  break;
-            }
-
-            row_info->bit_depth = 8;
-            row_info->pixel_depth = 8;
-            row_info->rowbytes = row_width;
-         }
-
-         if (trans_color != NULL)
-         {
-            if (row_info->bit_depth == 8)
-            {
-               gray = gray & 0xff;
-               sp = row + (png_size_t)row_width - 1;
-               dp = row + ((png_size_t)row_width << 1) - 1;
-
-               for (i = 0; i < row_width; i++)
-               {
-                  if ((*sp & 0xffU) == gray)
-                     *dp-- = 0;
-
-                  else
-                     *dp-- = 0xff;
-
-                  *dp-- = *sp--;
-               }
-            }
-
-            else if (row_info->bit_depth == 16)
-            {
-               unsigned int gray_high = (gray >> 8) & 0xff;
-               unsigned int gray_low = gray & 0xff;
-               sp = row + row_info->rowbytes - 1;
-               dp = row + (row_info->rowbytes << 1) - 1;
-               for (i = 0; i < row_width; i++)
-               {
-                  if ((*(sp - 1) & 0xffU) == gray_high &&
-                      (*(sp) & 0xffU) == gray_low)
-                  {
-                     *dp-- = 0;
-                     *dp-- = 0;
-                  }
-
-                  else
-                  {
-                     *dp-- = 0xff;
-                     *dp-- = 0xff;
-                  }
-
-                  *dp-- = *sp--;
-                  *dp-- = *sp--;
-               }
-            }
-
-            row_info->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
-            row_info->channels = 2;
-            row_info->pixel_depth = (png_byte)(row_info->bit_depth << 1);
-            row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
-                row_width);
-         }
-      }
-      else if (row_info->color_type == PNG_COLOR_TYPE_RGB &&
-          trans_color != NULL)
-      {
-         if (row_info->bit_depth == 8)
-         {
-            png_byte red = (png_byte)(trans_color->red & 0xff);
-            png_byte green = (png_byte)(trans_color->green & 0xff);
-            png_byte blue = (png_byte)(trans_color->blue & 0xff);
-            sp = row + (png_size_t)row_info->rowbytes - 1;
-            dp = row + ((png_size_t)row_width << 2) - 1;
-            for (i = 0; i < row_width; i++)
-            {
-               if (*(sp - 2) == red && *(sp - 1) == green && *(sp) == blue)
-                  *dp-- = 0;
-
-               else
-                  *dp-- = 0xff;
-
-               *dp-- = *sp--;
-               *dp-- = *sp--;
-               *dp-- = *sp--;
-            }
-         }
-         else if (row_info->bit_depth == 16)
-         {
-            png_byte red_high = (png_byte)((trans_color->red >> 8) & 0xff);
-            png_byte green_high = (png_byte)((trans_color->green >> 8) & 0xff);
-            png_byte blue_high = (png_byte)((trans_color->blue >> 8) & 0xff);
-            png_byte red_low = (png_byte)(trans_color->red & 0xff);
-            png_byte green_low = (png_byte)(trans_color->green & 0xff);
-            png_byte blue_low = (png_byte)(trans_color->blue & 0xff);
-            sp = row + row_info->rowbytes - 1;
-            dp = row + ((png_size_t)row_width << 3) - 1;
-            for (i = 0; i < row_width; i++)
-            {
-               if (*(sp - 5) == red_high &&
-                   *(sp - 4) == red_low &&
-                   *(sp - 3) == green_high &&
-                   *(sp - 2) == green_low &&
-                   *(sp - 1) == blue_high &&
-                   *(sp    ) == blue_low)
-               {
-                  *dp-- = 0;
-                  *dp-- = 0;
-               }
-
-               else
-               {
-                  *dp-- = 0xff;
-                  *dp-- = 0xff;
-               }
-
-               *dp-- = *sp--;
-               *dp-- = *sp--;
-               *dp-- = *sp--;
-               *dp-- = *sp--;
-               *dp-- = *sp--;
-               *dp-- = *sp--;
-            }
-         }
-         row_info->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
-         row_info->channels = 4;
-         row_info->pixel_depth = (png_byte)(row_info->bit_depth << 2);
-         row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
-      }
-   }
-}
-#endif
-
-#ifdef PNG_READ_EXPAND_16_SUPPORTED
-/* If the bit depth is 8 and the color type is not a palette type expand the
- * whole row to 16 bits.  Has no effect otherwise.
- */
-static void
-png_do_expand_16(png_row_infop row_info, png_bytep row)
-{
-   if (row_info->bit_depth == 8 &&
-      row_info->color_type != PNG_COLOR_TYPE_PALETTE)
-   {
-      /* The row have a sequence of bytes containing [0..255] and we need
-       * to turn it into another row containing [0..65535], to do this we
-       * calculate:
-       *
-       *  (input / 255) * 65535
-       *
-       *  Which happens to be exactly input * 257 and this can be achieved
-       *  simply by byte replication in place (copying backwards).
-       */
-      png_byte *sp = row + row_info->rowbytes; /* source, last byte + 1 */
-      png_byte *dp = sp + row_info->rowbytes;  /* destination, end + 1 */
-      while (dp > sp)
-      {
-         dp[-2] = dp[-1] = *--sp; dp -= 2;
-      }
-
-      row_info->rowbytes *= 2;
-      row_info->bit_depth = 16;
-      row_info->pixel_depth = (png_byte)(row_info->channels * 16);
-   }
-}
-#endif
-
-#ifdef PNG_READ_QUANTIZE_SUPPORTED
-static void
-png_do_quantize(png_row_infop row_info, png_bytep row,
-    png_const_bytep palette_lookup, png_const_bytep quantize_lookup)
-{
-   png_bytep sp, dp;
-   png_uint_32 i;
-   png_uint_32 row_width=row_info->width;
-
-   png_debug(1, "in png_do_quantize");
-
-   if (row_info->bit_depth == 8)
-   {
-      if (row_info->color_type == PNG_COLOR_TYPE_RGB && palette_lookup)
-      {
-         int r, g, b, p;
-         sp = row;
-         dp = row;
-         for (i = 0; i < row_width; i++)
-         {
-            r = *sp++;
-            g = *sp++;
-            b = *sp++;
-
-            /* This looks real messy, but the compiler will reduce
-             * it down to a reasonable formula.  For example, with
-             * 5 bits per color, we get:
-             * p = (((r >> 3) & 0x1f) << 10) |
-             *    (((g >> 3) & 0x1f) << 5) |
-             *    ((b >> 3) & 0x1f);
-             */
-            p = (((r >> (8 - PNG_QUANTIZE_RED_BITS)) &
-                ((1 << PNG_QUANTIZE_RED_BITS) - 1)) <<
-                (PNG_QUANTIZE_GREEN_BITS + PNG_QUANTIZE_BLUE_BITS)) |
-                (((g >> (8 - PNG_QUANTIZE_GREEN_BITS)) &
-                ((1 << PNG_QUANTIZE_GREEN_BITS) - 1)) <<
-                (PNG_QUANTIZE_BLUE_BITS)) |
-                ((b >> (8 - PNG_QUANTIZE_BLUE_BITS)) &
-                ((1 << PNG_QUANTIZE_BLUE_BITS) - 1));
-
-            *dp++ = palette_lookup[p];
-         }
-
-         row_info->color_type = PNG_COLOR_TYPE_PALETTE;
-         row_info->channels = 1;
-         row_info->pixel_depth = row_info->bit_depth;
-         row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
-      }
-
-      else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
-         palette_lookup != NULL)
-      {
-         int r, g, b, p;
-         sp = row;
-         dp = row;
-         for (i = 0; i < row_width; i++)
-         {
-            r = *sp++;
-            g = *sp++;
-            b = *sp++;
-            sp++;
-
-            p = (((r >> (8 - PNG_QUANTIZE_RED_BITS)) &
-                ((1 << PNG_QUANTIZE_RED_BITS) - 1)) <<
-                (PNG_QUANTIZE_GREEN_BITS + PNG_QUANTIZE_BLUE_BITS)) |
-                (((g >> (8 - PNG_QUANTIZE_GREEN_BITS)) &
-                ((1 << PNG_QUANTIZE_GREEN_BITS) - 1)) <<
-                (PNG_QUANTIZE_BLUE_BITS)) |
-                ((b >> (8 - PNG_QUANTIZE_BLUE_BITS)) &
-                ((1 << PNG_QUANTIZE_BLUE_BITS) - 1));
-
-            *dp++ = palette_lookup[p];
-         }
-
-         row_info->color_type = PNG_COLOR_TYPE_PALETTE;
-         row_info->channels = 1;
-         row_info->pixel_depth = row_info->bit_depth;
-         row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
-      }
-
-      else if (row_info->color_type == PNG_COLOR_TYPE_PALETTE &&
-         quantize_lookup)
-      {
-         sp = row;
-
-         for (i = 0; i < row_width; i++, sp++)
-         {
-            *sp = quantize_lookup[*sp];
-         }
-      }
-   }
-}
-#endif /* READ_QUANTIZE */
-
-/* Transform the row.  The order of transformations is significant,
- * and is very touchy.  If you add a transformation, take care to
- * decide how it fits in with the other transformations here.
- */
-void /* PRIVATE */
-png_do_read_transformations(png_structrp png_ptr, png_row_infop row_info)
-{
-   png_debug(1, "in png_do_read_transformations");
-
-   if (png_ptr->row_buf == NULL)
-   {
-      /* Prior to 1.5.4 this output row/pass where the NULL pointer is, but this
-       * error is incredibly rare and incredibly easy to debug without this
-       * information.
-       */
-      png_error(png_ptr, "NULL row buffer");
-   }
-
-   /* The following is debugging; prior to 1.5.4 the code was never compiled in;
-    * in 1.5.4 PNG_FLAG_DETECT_UNINITIALIZED was added and the macro
-    * PNG_WARN_UNINITIALIZED_ROW removed.  In 1.6 the new flag is set only for
-    * all transformations, however in practice the ROW_INIT always gets done on
-    * demand, if necessary.
-    */
-   if ((png_ptr->flags & PNG_FLAG_DETECT_UNINITIALIZED) != 0 &&
-       (png_ptr->flags & PNG_FLAG_ROW_INIT) == 0)
-   {
-      /* Application has failed to call either png_read_start_image() or
-       * png_read_update_info() after setting transforms that expand pixels.
-       * This check added to libpng-1.2.19 (but not enabled until 1.5.4).
-       */
-      png_error(png_ptr, "Uninitialized row");
-   }
-
-#ifdef PNG_READ_EXPAND_SUPPORTED
-   if ((png_ptr->transformations & PNG_EXPAND) != 0)
-   {
-      if (row_info->color_type == PNG_COLOR_TYPE_PALETTE)
-      {
-         png_do_expand_palette(row_info, png_ptr->row_buf + 1,
-             png_ptr->palette, png_ptr->trans_alpha, png_ptr->num_trans);
-      }
-
-      else
-      {
-         if (png_ptr->num_trans != 0 &&
-             (png_ptr->transformations & PNG_EXPAND_tRNS) != 0)
-            png_do_expand(row_info, png_ptr->row_buf + 1,
-                &(png_ptr->trans_color));
-
-         else
-            png_do_expand(row_info, png_ptr->row_buf + 1,
-                NULL);
-      }
-   }
-#endif
-
-#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
-   if ((png_ptr->transformations & PNG_STRIP_ALPHA) != 0 &&
-       (png_ptr->transformations & PNG_COMPOSE) == 0 &&
-       (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA ||
-       row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA))
-      png_do_strip_channel(row_info, png_ptr->row_buf + 1,
-          0 /* at_start == false, because SWAP_ALPHA happens later */);
-#endif
-
-#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-   if ((png_ptr->transformations & PNG_RGB_TO_GRAY) != 0)
-   {
-      int rgb_error =
-          png_do_rgb_to_gray(png_ptr, row_info,
-              png_ptr->row_buf + 1);
-
-      if (rgb_error != 0)
-      {
-         png_ptr->rgb_to_gray_status=1;
-         if ((png_ptr->transformations & PNG_RGB_TO_GRAY) ==
-             PNG_RGB_TO_GRAY_WARN)
-            png_warning(png_ptr, "png_do_rgb_to_gray found nongray pixel");
-
-         if ((png_ptr->transformations & PNG_RGB_TO_GRAY) ==
-             PNG_RGB_TO_GRAY_ERR)
-            png_error(png_ptr, "png_do_rgb_to_gray found nongray pixel");
-      }
-   }
-#endif
-
-/* From Andreas Dilger e-mail to png-implement, 26 March 1998:
- *
- *   In most cases, the "simple transparency" should be done prior to doing
- *   gray-to-RGB, or you will have to test 3x as many bytes to check if a
- *   pixel is transparent.  You would also need to make sure that the
- *   transparency information is upgraded to RGB.
- *
- *   To summarize, the current flow is:
- *   - Gray + simple transparency -> compare 1 or 2 gray bytes and composite
- *                                   with background "in place" if transparent,
- *                                   convert to RGB if necessary
- *   - Gray + alpha -> composite with gray background and remove alpha bytes,
- *                                   convert to RGB if necessary
- *
- *   To support RGB backgrounds for gray images we need:
- *   - Gray + simple transparency -> convert to RGB + simple transparency,
- *                                   compare 3 or 6 bytes and composite with
- *                                   background "in place" if transparent
- *                                   (3x compare/pixel compared to doing
- *                                   composite with gray bkgrnd)
- *   - Gray + alpha -> convert to RGB + alpha, composite with background and
- *                                   remove alpha bytes (3x float
- *                                   operations/pixel compared with composite
- *                                   on gray background)
- *
- *  Greg's change will do this.  The reason it wasn't done before is for
- *  performance, as this increases the per-pixel operations.  If we would check
- *  in advance if the background was gray or RGB, and position the gray-to-RGB
- *  transform appropriately, then it would save a lot of work/time.
- */
-
-#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
-   /* If gray -> RGB, do so now only if background is non-gray; else do later
-    * for performance reasons
-    */
-   if ((png_ptr->transformations & PNG_GRAY_TO_RGB) != 0 &&
-       (png_ptr->mode & PNG_BACKGROUND_IS_GRAY) == 0)
-      png_do_gray_to_rgb(row_info, png_ptr->row_buf + 1);
-#endif
-
-#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
-   defined(PNG_READ_ALPHA_MODE_SUPPORTED)
-   if ((png_ptr->transformations & PNG_COMPOSE) != 0)
-      png_do_compose(row_info, png_ptr->row_buf + 1, png_ptr);
-#endif
-
-#ifdef PNG_READ_GAMMA_SUPPORTED
-   if ((png_ptr->transformations & PNG_GAMMA) != 0 &&
-#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-      /* Because RGB_TO_GRAY does the gamma transform. */
-      (png_ptr->transformations & PNG_RGB_TO_GRAY) == 0 &&
-#endif
-#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
-   defined(PNG_READ_ALPHA_MODE_SUPPORTED)
-      /* Because PNG_COMPOSE does the gamma transform if there is something to
-       * do (if there is an alpha channel or transparency.)
-       */
-       !((png_ptr->transformations & PNG_COMPOSE) != 0 &&
-       ((png_ptr->num_trans != 0) ||
-       (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)) &&
-#endif
-      /* Because png_init_read_transformations transforms the palette, unless
-       * RGB_TO_GRAY will do the transform.
-       */
-       (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE))
-      png_do_gamma(row_info, png_ptr->row_buf + 1, png_ptr);
-#endif
-
-#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
-   if ((png_ptr->transformations & PNG_STRIP_ALPHA) != 0 &&
-       (png_ptr->transformations & PNG_COMPOSE) != 0 &&
-       (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA ||
-       row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA))
-      png_do_strip_channel(row_info, png_ptr->row_buf + 1,
-          0 /* at_start == false, because SWAP_ALPHA happens later */);
-#endif
-
-#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
-   if ((png_ptr->transformations & PNG_ENCODE_ALPHA) != 0 &&
-       (row_info->color_type & PNG_COLOR_MASK_ALPHA) != 0)
-      png_do_encode_alpha(row_info, png_ptr->row_buf + 1, png_ptr);
-#endif
-
-#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
-   if ((png_ptr->transformations & PNG_SCALE_16_TO_8) != 0)
-      png_do_scale_16_to_8(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
-   /* There is no harm in doing both of these because only one has any effect,
-    * by putting the 'scale' option first if the app asks for scale (either by
-    * calling the API or in a TRANSFORM flag) this is what happens.
-    */
-   if ((png_ptr->transformations & PNG_16_TO_8) != 0)
-      png_do_chop(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_READ_QUANTIZE_SUPPORTED
-   if ((png_ptr->transformations & PNG_QUANTIZE) != 0)
-   {
-      png_do_quantize(row_info, png_ptr->row_buf + 1,
-          png_ptr->palette_lookup, png_ptr->quantize_index);
-
-      if (row_info->rowbytes == 0)
-         png_error(png_ptr, "png_do_quantize returned rowbytes=0");
-   }
-#endif /* READ_QUANTIZE */
-
-#ifdef PNG_READ_EXPAND_16_SUPPORTED
-   /* Do the expansion now, after all the arithmetic has been done.  Notice
-    * that previous transformations can handle the PNG_EXPAND_16 flag if this
-    * is efficient (particularly true in the case of gamma correction, where
-    * better accuracy results faster!)
-    */
-   if ((png_ptr->transformations & PNG_EXPAND_16) != 0)
-      png_do_expand_16(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
-   /* NOTE: moved here in 1.5.4 (from much later in this list.) */
-   if ((png_ptr->transformations & PNG_GRAY_TO_RGB) != 0 &&
-       (png_ptr->mode & PNG_BACKGROUND_IS_GRAY) != 0)
-      png_do_gray_to_rgb(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_READ_INVERT_SUPPORTED
-   if ((png_ptr->transformations & PNG_INVERT_MONO) != 0)
-      png_do_invert(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
-   if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0)
-      png_do_read_invert_alpha(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_READ_SHIFT_SUPPORTED
-   if ((png_ptr->transformations & PNG_SHIFT) != 0)
-      png_do_unshift(row_info, png_ptr->row_buf + 1,
-          &(png_ptr->shift));
-#endif
-
-#ifdef PNG_READ_PACK_SUPPORTED
-   if ((png_ptr->transformations & PNG_PACK) != 0)
-      png_do_unpack(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED
-   /* Added at libpng-1.5.10 */
-   if (row_info->color_type == PNG_COLOR_TYPE_PALETTE &&
-       png_ptr->num_palette_max >= 0)
-      png_do_check_palette_indexes(png_ptr, row_info);
-#endif
-
-#ifdef PNG_READ_BGR_SUPPORTED
-   if ((png_ptr->transformations & PNG_BGR) != 0)
-      png_do_bgr(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_READ_PACKSWAP_SUPPORTED
-   if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
-      png_do_packswap(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_READ_FILLER_SUPPORTED
-   if ((png_ptr->transformations & PNG_FILLER) != 0)
-      png_do_read_filler(row_info, png_ptr->row_buf + 1,
-          (png_uint_32)png_ptr->filler, png_ptr->flags);
-#endif
-
-#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
-   if ((png_ptr->transformations & PNG_SWAP_ALPHA) != 0)
-      png_do_read_swap_alpha(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_READ_16BIT_SUPPORTED
-#ifdef PNG_READ_SWAP_SUPPORTED
-   if ((png_ptr->transformations & PNG_SWAP_BYTES) != 0)
-      png_do_swap(row_info, png_ptr->row_buf + 1);
-#endif
-#endif
-
-#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
-   if ((png_ptr->transformations & PNG_USER_TRANSFORM) != 0)
-   {
-      if (png_ptr->read_user_transform_fn != NULL)
-         (*(png_ptr->read_user_transform_fn)) /* User read transform function */
-             (png_ptr,     /* png_ptr */
-             row_info,     /* row_info: */
-                /*  png_uint_32 width;       width of row */
-                /*  png_size_t rowbytes;     number of bytes in row */
-                /*  png_byte color_type;     color type of pixels */
-                /*  png_byte bit_depth;      bit depth of samples */
-                /*  png_byte channels;       number of channels (1-4) */
-                /*  png_byte pixel_depth;    bits per pixel (depth*channels) */
-             png_ptr->row_buf + 1);    /* start of pixel data for row */
-#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
-      if (png_ptr->user_transform_depth != 0)
-         row_info->bit_depth = png_ptr->user_transform_depth;
-
-      if (png_ptr->user_transform_channels != 0)
-         row_info->channels = png_ptr->user_transform_channels;
-#endif
-      row_info->pixel_depth = (png_byte)(row_info->bit_depth *
-          row_info->channels);
-
-      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_info->width);
-   }
-#endif
-}
-
-#endif /* READ_TRANSFORMS */
-#endif /* READ */
diff --git a/src/png/libpng/pngrutil.c b/src/png/libpng/pngrutil.c
deleted file mode 100644
index 8692933bd..000000000
--- a/src/png/libpng/pngrutil.c
+++ /dev/null
@@ -1,4661 +0,0 @@
-
-/* pngrutil.c - utilities to read a PNG file
- *
- * Last changed in libpng 1.6.33 [September 28, 2017]
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * This file contains routines that are only called from within
- * libpng itself during the course of reading an image.
- */
-
-#include "pngpriv.h"
-
-#ifdef PNG_READ_SUPPORTED
-
-png_uint_32 PNGAPI
-png_get_uint_31(png_const_structrp png_ptr, png_const_bytep buf)
-{
-   png_uint_32 uval = png_get_uint_32(buf);
-
-   if (uval > PNG_UINT_31_MAX)
-      png_error(png_ptr, "PNG unsigned integer out of range");
-
-   return (uval);
-}
-
-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_READ_cHRM_SUPPORTED)
-/* The following is a variation on the above for use with the fixed
- * point values used for gAMA and cHRM.  Instead of png_error it
- * issues a warning and returns (-1) - an invalid value because both
- * gAMA and cHRM use *unsigned* integers for fixed point values.
- */
-#define PNG_FIXED_ERROR (-1)
-
-static png_fixed_point /* PRIVATE */
-png_get_fixed_point(png_structrp png_ptr, png_const_bytep buf)
-{
-   png_uint_32 uval = png_get_uint_32(buf);
-
-   if (uval <= PNG_UINT_31_MAX)
-      return (png_fixed_point)uval; /* known to be in range */
-
-   /* The caller can turn off the warning by passing NULL. */
-   if (png_ptr != NULL)
-      png_warning(png_ptr, "PNG fixed point integer out of range");
-
-   return PNG_FIXED_ERROR;
-}
-#endif
-
-#ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED
-/* NOTE: the read macros will obscure these definitions, so that if
- * PNG_USE_READ_MACROS is set the library will not use them internally,
- * but the APIs will still be available externally.
- *
- * The parentheses around "PNGAPI function_name" in the following three
- * functions are necessary because they allow the macros to co-exist with
- * these (unused but exported) functions.
- */
-
-/* Grab an unsigned 32-bit integer from a buffer in big-endian format. */
-png_uint_32 (PNGAPI
-png_get_uint_32)(png_const_bytep buf)
-{
-   png_uint_32 uval =
-       ((png_uint_32)(*(buf    )) << 24) +
-       ((png_uint_32)(*(buf + 1)) << 16) +
-       ((png_uint_32)(*(buf + 2)) <<  8) +
-       ((png_uint_32)(*(buf + 3))      ) ;
-
-   return uval;
-}
-
-/* Grab a signed 32-bit integer from a buffer in big-endian format.  The
- * data is stored in the PNG file in two's complement format and there
- * is no guarantee that a 'png_int_32' is exactly 32 bits, therefore
- * the following code does a two's complement to native conversion.
- */
-png_int_32 (PNGAPI
-png_get_int_32)(png_const_bytep buf)
-{
-   png_uint_32 uval = png_get_uint_32(buf);
-   if ((uval & 0x80000000) == 0) /* non-negative */
-      return (png_int_32)uval;
-
-   uval = (uval ^ 0xffffffff) + 1;  /* 2's complement: -x = ~x+1 */
-   if ((uval & 0x80000000) == 0) /* no overflow */
-      return -(png_int_32)uval;
-   /* The following has to be safe; this function only gets called on PNG data
-    * and if we get here that data is invalid.  0 is the most safe value and
-    * if not then an attacker would surely just generate a PNG with 0 instead.
-    */
-   return 0;
-}
-
-/* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
-png_uint_16 (PNGAPI
-png_get_uint_16)(png_const_bytep buf)
-{
-   /* ANSI-C requires an int value to accomodate at least 16 bits so this
-    * works and allows the compiler not to worry about possible narrowing
-    * on 32-bit systems.  (Pre-ANSI systems did not make integers smaller
-    * than 16 bits either.)
-    */
-   unsigned int val =
-       ((unsigned int)(*buf) << 8) +
-       ((unsigned int)(*(buf + 1)));
-
-   return (png_uint_16)val;
-}
-
-#endif /* READ_INT_FUNCTIONS */
-
-/* Read and check the PNG file signature */
-void /* PRIVATE */
-png_read_sig(png_structrp png_ptr, png_inforp info_ptr)
-{
-   png_size_t num_checked, num_to_check;
-
-   /* Exit if the user application does not expect a signature. */
-   if (png_ptr->sig_bytes >= 8)
-      return;
-
-   num_checked = png_ptr->sig_bytes;
-   num_to_check = 8 - num_checked;
-
-#ifdef PNG_IO_STATE_SUPPORTED
-   png_ptr->io_state = PNG_IO_READING | PNG_IO_SIGNATURE;
-#endif
-
-   /* The signature must be serialized in a single I/O call. */
-   png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
-   png_ptr->sig_bytes = 8;
-
-   if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check) != 0)
-   {
-      if (num_checked < 4 &&
-          png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
-         png_error(png_ptr, "Not a PNG file");
-      else
-         png_error(png_ptr, "PNG file corrupted by ASCII conversion");
-   }
-   if (num_checked < 3)
-      png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
-}
-
-/* Read the chunk header (length + type name).
- * Put the type name into png_ptr->chunk_name, and return the length.
- */
-png_uint_32 /* PRIVATE */
-png_read_chunk_header(png_structrp png_ptr)
-{
-   png_byte buf[8];
-   png_uint_32 length;
-
-#ifdef PNG_IO_STATE_SUPPORTED
-   png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_HDR;
-#endif
-
-   /* Read the length and the chunk name.
-    * This must be performed in a single I/O call.
-    */
-   png_read_data(png_ptr, buf, 8);
-   length = png_get_uint_31(png_ptr, buf);
-
-   /* Put the chunk name into png_ptr->chunk_name. */
-   png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(buf+4);
-
-   png_debug2(0, "Reading %lx chunk, length = %lu",
-       (unsigned long)png_ptr->chunk_name, (unsigned long)length);
-
-   /* Reset the crc and run it over the chunk name. */
-   png_reset_crc(png_ptr);
-   png_calculate_crc(png_ptr, buf + 4, 4);
-
-   /* Check to see if chunk name is valid. */
-   png_check_chunk_name(png_ptr, png_ptr->chunk_name);
-
-   /* Check for too-large chunk length */
-   png_check_chunk_length(png_ptr, length);
-
-#ifdef PNG_IO_STATE_SUPPORTED
-   png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_DATA;
-#endif
-
-   return length;
-}
-
-/* Read data, and (optionally) run it through the CRC. */
-void /* PRIVATE */
-png_crc_read(png_structrp png_ptr, png_bytep buf, png_uint_32 length)
-{
-   if (png_ptr == NULL)
-      return;
-
-   png_read_data(png_ptr, buf, length);
-   png_calculate_crc(png_ptr, buf, length);
-}
-
-/* Optionally skip data and then check the CRC.  Depending on whether we
- * are reading an ancillary or critical chunk, and how the program has set
- * things up, we may calculate the CRC on the data and print a message.
- * Returns '1' if there was a CRC error, '0' otherwise.
- */
-int /* PRIVATE */
-png_crc_finish(png_structrp png_ptr, png_uint_32 skip)
-{
-   /* The size of the local buffer for inflate is a good guess as to a
-    * reasonable size to use for buffering reads from the application.
-    */
-   while (skip > 0)
-   {
-      png_uint_32 len;
-      png_byte tmpbuf[PNG_INFLATE_BUF_SIZE];
-
-      len = (sizeof tmpbuf);
-      if (len > skip)
-         len = skip;
-      skip -= len;
-
-      png_crc_read(png_ptr, tmpbuf, len);
-   }
-
-   if (png_crc_error(png_ptr) != 0)
-   {
-      if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name) != 0 ?
-          (png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) == 0 :
-          (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE) != 0)
-      {
-         png_chunk_warning(png_ptr, "CRC error");
-      }
-
-      else
-         png_chunk_error(png_ptr, "CRC error");
-
-      return (1);
-   }
-
-   return (0);
-}
-
-/* Compare the CRC stored in the PNG file with that calculated by libpng from
- * the data it has read thus far.
- */
-int /* PRIVATE */
-png_crc_error(png_structrp png_ptr)
-{
-   png_byte crc_bytes[4];
-   png_uint_32 crc;
-   int need_crc = 1;
-
-   if (PNG_CHUNK_ANCILLARY(png_ptr->chunk_name) != 0)
-   {
-      if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
-          (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
-         need_crc = 0;
-   }
-
-   else /* critical */
-   {
-      if ((png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) != 0)
-         need_crc = 0;
-   }
-
-#ifdef PNG_IO_STATE_SUPPORTED
-   png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_CRC;
-#endif
-
-   /* The chunk CRC must be serialized in a single I/O call. */
-   png_read_data(png_ptr, crc_bytes, 4);
-
-   if (need_crc != 0)
-   {
-      crc = png_get_uint_32(crc_bytes);
-      return ((int)(crc != png_ptr->crc));
-   }
-
-   else
-      return (0);
-}
-
-#if defined(PNG_READ_iCCP_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) ||\
-    defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_READ_sCAL_SUPPORTED) ||\
-    defined(PNG_READ_sPLT_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) ||\
-    defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_SEQUENTIAL_READ_SUPPORTED)
-/* Manage the read buffer; this simply reallocates the buffer if it is not small
- * enough (or if it is not allocated).  The routine returns a pointer to the
- * buffer; if an error occurs and 'warn' is set the routine returns NULL, else
- * it will call png_error (via png_malloc) on failure.  (warn == 2 means
- * 'silent').
- */
-static png_bytep
-png_read_buffer(png_structrp png_ptr, png_alloc_size_t new_size, int warn)
-{
-   png_bytep buffer = png_ptr->read_buffer;
-
-   if (buffer != NULL && new_size > png_ptr->read_buffer_size)
-   {
-      png_ptr->read_buffer = NULL;
-      png_ptr->read_buffer = NULL;
-      png_ptr->read_buffer_size = 0;
-      png_free(png_ptr, buffer);
-      buffer = NULL;
-   }
-
-   if (buffer == NULL)
-   {
-      buffer = png_voidcast(png_bytep, png_malloc_base(png_ptr, new_size));
-
-      if (buffer != NULL)
-      {
-         memset(buffer, 0, new_size); /* just in case */
-         png_ptr->read_buffer = buffer;
-         png_ptr->read_buffer_size = new_size;
-      }
-
-      else if (warn < 2) /* else silent */
-      {
-         if (warn != 0)
-             png_chunk_warning(png_ptr, "insufficient memory to read chunk");
-
-         else
-             png_chunk_error(png_ptr, "insufficient memory to read chunk");
-      }
-   }
-
-   return buffer;
-}
-#endif /* READ_iCCP|iTXt|pCAL|sCAL|sPLT|tEXt|zTXt|SEQUENTIAL_READ */
-
-/* png_inflate_claim: claim the zstream for some nefarious purpose that involves
- * decompression.  Returns Z_OK on success, else a zlib error code.  It checks
- * the owner but, in final release builds, just issues a warning if some other
- * chunk apparently owns the stream.  Prior to release it does a png_error.
- */
-static int
-png_inflate_claim(png_structrp png_ptr, png_uint_32 owner)
-{
-   if (png_ptr->zowner != 0)
-   {
-      char msg[64];
-
-      PNG_STRING_FROM_CHUNK(msg, png_ptr->zowner);
-      /* So the message that results is "<chunk> using zstream"; this is an
-       * internal error, but is very useful for debugging.  i18n requirements
-       * are minimal.
-       */
-      (void)png_safecat(msg, (sizeof msg), 4, " using zstream");
-#if PNG_RELEASE_BUILD
-      png_chunk_warning(png_ptr, msg);
-      png_ptr->zowner = 0;
-#else
-      png_chunk_error(png_ptr, msg);
-#endif
-   }
-
-   /* Implementation note: unlike 'png_deflate_claim' this internal function
-    * does not take the size of the data as an argument.  Some efficiency could
-    * be gained by using this when it is known *if* the zlib stream itself does
-    * not record the number; however, this is an illusion: the original writer
-    * of the PNG may have selected a lower window size, and we really must
-    * follow that because, for systems with with limited capabilities, we
-    * would otherwise reject the application's attempts to use a smaller window
-    * size (zlib doesn't have an interface to say "this or lower"!).
-    *
-    * inflateReset2 was added to zlib 1.2.4; before this the window could not be
-    * reset, therefore it is necessary to always allocate the maximum window
-    * size with earlier zlibs just in case later compressed chunks need it.
-    */
-   {
-      int ret; /* zlib return code */
-#if ZLIB_VERNUM >= 0x1240
-      int window_bits = 0;
-
-# if defined(PNG_SET_OPTION_SUPPORTED) && defined(PNG_MAXIMUM_INFLATE_WINDOW)
-      if (((png_ptr->options >> PNG_MAXIMUM_INFLATE_WINDOW) & 3) ==
-          PNG_OPTION_ON)
-      {
-         window_bits = 15;
-         png_ptr->zstream_start = 0; /* fixed window size */
-      }
-
-      else
-      {
-         png_ptr->zstream_start = 1;
-      }
-# endif
-
-#endif /* ZLIB_VERNUM >= 0x1240 */
-
-      /* Set this for safety, just in case the previous owner left pointers to
-       * memory allocations.
-       */
-      png_ptr->zstream.next_in = NULL;
-      png_ptr->zstream.avail_in = 0;
-      png_ptr->zstream.next_out = NULL;
-      png_ptr->zstream.avail_out = 0;
-
-      if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) != 0)
-      {
-#if ZLIB_VERNUM >= 0x1240
-         ret = inflateReset2(&png_ptr->zstream, window_bits);
-#else
-         ret = inflateReset(&png_ptr->zstream);
-#endif
-      }
-
-      else
-      {
-#if ZLIB_VERNUM >= 0x1240
-         ret = inflateInit2(&png_ptr->zstream, window_bits);
-#else
-         ret = inflateInit(&png_ptr->zstream);
-#endif
-
-         if (ret == Z_OK)
-            png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED;
-      }
-
-#if ZLIB_VERNUM >= 0x1290 && \
-   defined(PNG_SET_OPTION_SUPPORTED) && defined(PNG_IGNORE_ADLER32)
-      if (((png_ptr->options >> PNG_IGNORE_ADLER32) & 3) == PNG_OPTION_ON)
-         /* Turn off validation of the ADLER32 checksum in IDAT chunks */
-         ret = inflateValidate(&png_ptr->zstream, 0);
-#endif
-
-      if (ret == Z_OK)
-         png_ptr->zowner = owner;
-
-      else
-         png_zstream_error(png_ptr, ret);
-
-      return ret;
-   }
-
-#ifdef window_bits
-# undef window_bits
-#endif
-}
-
-#if ZLIB_VERNUM >= 0x1240
-/* Handle the start of the inflate stream if we called inflateInit2(strm,0);
- * in this case some zlib versions skip validation of the CINFO field and, in
- * certain circumstances, libpng may end up displaying an invalid image, in
- * contrast to implementations that call zlib in the normal way (e.g. libpng
- * 1.5).
- */
-int /* PRIVATE */
-png_zlib_inflate(png_structrp png_ptr, int flush)
-{
-   if (png_ptr->zstream_start && png_ptr->zstream.avail_in > 0)
-   {
-      if ((*png_ptr->zstream.next_in >> 4) > 7)
-      {
-         png_ptr->zstream.msg = "invalid window size (libpng)";
-         return Z_DATA_ERROR;
-      }
-
-      png_ptr->zstream_start = 0;
-   }
-
-   return inflate(&png_ptr->zstream, flush);
-}
-#endif /* Zlib >= 1.2.4 */
-
-#ifdef PNG_READ_COMPRESSED_TEXT_SUPPORTED
-#if defined(PNG_READ_zTXt_SUPPORTED) || defined (PNG_READ_iTXt_SUPPORTED)
-/* png_inflate now returns zlib error codes including Z_OK and Z_STREAM_END to
- * allow the caller to do multiple calls if required.  If the 'finish' flag is
- * set Z_FINISH will be passed to the final inflate() call and Z_STREAM_END must
- * be returned or there has been a problem, otherwise Z_SYNC_FLUSH is used and
- * Z_OK or Z_STREAM_END will be returned on success.
- *
- * The input and output sizes are updated to the actual amounts of data consumed
- * or written, not the amount available (as in a z_stream).  The data pointers
- * are not changed, so the next input is (data+input_size) and the next
- * available output is (output+output_size).
- */
-static int
-png_inflate(png_structrp png_ptr, png_uint_32 owner, int finish,
-    /* INPUT: */ png_const_bytep input, png_uint_32p input_size_ptr,
-    /* OUTPUT: */ png_bytep output, png_alloc_size_t *output_size_ptr)
-{
-   if (png_ptr->zowner == owner) /* Else not claimed */
-   {
-      int ret;
-      png_alloc_size_t avail_out = *output_size_ptr;
-      png_uint_32 avail_in = *input_size_ptr;
-
-      /* zlib can't necessarily handle more than 65535 bytes at once (i.e. it
-       * can't even necessarily handle 65536 bytes) because the type uInt is
-       * "16 bits or more".  Consequently it is necessary to chunk the input to
-       * zlib.  This code uses ZLIB_IO_MAX, from pngpriv.h, as the maximum (the
-       * maximum value that can be stored in a uInt.)  It is possible to set
-       * ZLIB_IO_MAX to a lower value in pngpriv.h and this may sometimes have
-       * a performance advantage, because it reduces the amount of data accessed
-       * at each step and that may give the OS more time to page it in.
-       */
-      png_ptr->zstream.next_in = PNGZ_INPUT_CAST(input);
-      /* avail_in and avail_out are set below from 'size' */
-      png_ptr->zstream.avail_in = 0;
-      png_ptr->zstream.avail_out = 0;
-
-      /* Read directly into the output if it is available (this is set to
-       * a local buffer below if output is NULL).
-       */
-      if (output != NULL)
-         png_ptr->zstream.next_out = output;
-
-      do
-      {
-         uInt avail;
-         Byte local_buffer[PNG_INFLATE_BUF_SIZE];
-
-         /* zlib INPUT BUFFER */
-         /* The setting of 'avail_in' used to be outside the loop; by setting it
-          * inside it is possible to chunk the input to zlib and simply rely on
-          * zlib to advance the 'next_in' pointer.  This allows arbitrary
-          * amounts of data to be passed through zlib at the unavoidable cost of
-          * requiring a window save (memcpy of up to 32768 output bytes)
-          * every ZLIB_IO_MAX input bytes.
-          */
-         avail_in += png_ptr->zstream.avail_in; /* not consumed last time */
-
-         avail = ZLIB_IO_MAX;
-
-         if (avail_in < avail)
-            avail = (uInt)avail_in; /* safe: < than ZLIB_IO_MAX */
-
-         avail_in -= avail;
-         png_ptr->zstream.avail_in = avail;
-
-         /* zlib OUTPUT BUFFER */
-         avail_out += png_ptr->zstream.avail_out; /* not written last time */
-
-         avail = ZLIB_IO_MAX; /* maximum zlib can process */
-
-         if (output == NULL)
-         {
-            /* Reset the output buffer each time round if output is NULL and
-             * make available the full buffer, up to 'remaining_space'
-             */
-            png_ptr->zstream.next_out = local_buffer;
-            if ((sizeof local_buffer) < avail)
-               avail = (sizeof local_buffer);
-         }
-
-         if (avail_out < avail)
-            avail = (uInt)avail_out; /* safe: < ZLIB_IO_MAX */
-
-         png_ptr->zstream.avail_out = avail;
-         avail_out -= avail;
-
-         /* zlib inflate call */
-         /* In fact 'avail_out' may be 0 at this point, that happens at the end
-          * of the read when the final LZ end code was not passed at the end of
-          * the previous chunk of input data.  Tell zlib if we have reached the
-          * end of the output buffer.
-          */
-         ret = PNG_INFLATE(png_ptr, avail_out > 0 ? Z_NO_FLUSH :
-             (finish ? Z_FINISH : Z_SYNC_FLUSH));
-      } while (ret == Z_OK);
-
-      /* For safety kill the local buffer pointer now */
-      if (output == NULL)
-         png_ptr->zstream.next_out = NULL;
-
-      /* Claw back the 'size' and 'remaining_space' byte counts. */
-      avail_in += png_ptr->zstream.avail_in;
-      avail_out += png_ptr->zstream.avail_out;
-
-      /* Update the input and output sizes; the updated values are the amount
-       * consumed or written, effectively the inverse of what zlib uses.
-       */
-      if (avail_out > 0)
-         *output_size_ptr -= avail_out;
-
-      if (avail_in > 0)
-         *input_size_ptr -= avail_in;
-
-      /* Ensure png_ptr->zstream.msg is set (even in the success case!) */
-      png_zstream_error(png_ptr, ret);
-      return ret;
-   }
-
-   else
-   {
-      /* This is a bad internal error.  The recovery assigns to the zstream msg
-       * pointer, which is not owned by the caller, but this is safe; it's only
-       * used on errors!
-       */
-      png_ptr->zstream.msg = PNGZ_MSG_CAST("zstream unclaimed");
-      return Z_STREAM_ERROR;
-   }
-}
-
-/*
- * Decompress trailing data in a chunk.  The assumption is that read_buffer
- * points at an allocated area holding the contents of a chunk with a
- * trailing compressed part.  What we get back is an allocated area
- * holding the original prefix part and an uncompressed version of the
- * trailing part (the malloc area passed in is freed).
- */
-static int
-png_decompress_chunk(png_structrp png_ptr,
-    png_uint_32 chunklength, png_uint_32 prefix_size,
-    png_alloc_size_t *newlength /* must be initialized to the maximum! */,
-    int terminate /*add a '\0' to the end of the uncompressed data*/)
-{
-   /* TODO: implement different limits for different types of chunk.
-    *
-    * The caller supplies *newlength set to the maximum length of the
-    * uncompressed data, but this routine allocates space for the prefix and
-    * maybe a '\0' terminator too.  We have to assume that 'prefix_size' is
-    * limited only by the maximum chunk size.
-    */
-   png_alloc_size_t limit = PNG_SIZE_MAX;
-
-# ifdef PNG_SET_USER_LIMITS_SUPPORTED
-   if (png_ptr->user_chunk_malloc_max > 0 &&
-       png_ptr->user_chunk_malloc_max < limit)
-      limit = png_ptr->user_chunk_malloc_max;
-# elif PNG_USER_CHUNK_MALLOC_MAX > 0
-   if (PNG_USER_CHUNK_MALLOC_MAX < limit)
-      limit = PNG_USER_CHUNK_MALLOC_MAX;
-# endif
-
-   if (limit >= prefix_size + (terminate != 0))
-   {
-      int ret;
-
-      limit -= prefix_size + (terminate != 0);
-
-      if (limit < *newlength)
-         *newlength = limit;
-
-      /* Now try to claim the stream. */
-      ret = png_inflate_claim(png_ptr, png_ptr->chunk_name);
-
-      if (ret == Z_OK)
-      {
-         png_uint_32 lzsize = chunklength - prefix_size;
-
-         ret = png_inflate(png_ptr, png_ptr->chunk_name, 1/*finish*/,
-             /* input: */ png_ptr->read_buffer + prefix_size, &lzsize,
-             /* output: */ NULL, newlength);
-
-         if (ret == Z_STREAM_END)
-         {
-            /* Use 'inflateReset' here, not 'inflateReset2' because this
-             * preserves the previously decided window size (otherwise it would
-             * be necessary to store the previous window size.)  In practice
-             * this doesn't matter anyway, because png_inflate will call inflate
-             * with Z_FINISH in almost all cases, so the window will not be
-             * maintained.
-             */
-            if (inflateReset(&png_ptr->zstream) == Z_OK)
-            {
-               /* Because of the limit checks above we know that the new,
-                * expanded, size will fit in a size_t (let alone an
-                * png_alloc_size_t).  Use png_malloc_base here to avoid an
-                * extra OOM message.
-                */
-               png_alloc_size_t new_size = *newlength;
-               png_alloc_size_t buffer_size = prefix_size + new_size +
-                   (terminate != 0);
-               png_bytep text = png_voidcast(png_bytep, png_malloc_base(png_ptr,
-                   buffer_size));
-
-               if (text != NULL)
-               {
-                  memset(text, 0, buffer_size);
-
-                  ret = png_inflate(png_ptr, png_ptr->chunk_name, 1/*finish*/,
-                      png_ptr->read_buffer + prefix_size, &lzsize,
-                      text + prefix_size, newlength);
-
-                  if (ret == Z_STREAM_END)
-                  {
-                     if (new_size == *newlength)
-                     {
-                        if (terminate != 0)
-                           text[prefix_size + *newlength] = 0;
-
-                        if (prefix_size > 0)
-                           memcpy(text, png_ptr->read_buffer, prefix_size);
-
-                        {
-                           png_bytep old_ptr = png_ptr->read_buffer;
-
-                           png_ptr->read_buffer = text;
-                           png_ptr->read_buffer_size = buffer_size;
-                           text = old_ptr; /* freed below */
-                        }
-                     }
-
-                     else
-                     {
-                        /* The size changed on the second read, there can be no
-                         * guarantee that anything is correct at this point.
-                         * The 'msg' pointer has been set to "unexpected end of
-                         * LZ stream", which is fine, but return an error code
-                         * that the caller won't accept.
-                         */
-                        ret = PNG_UNEXPECTED_ZLIB_RETURN;
-                     }
-                  }
-
-                  else if (ret == Z_OK)
-                     ret = PNG_UNEXPECTED_ZLIB_RETURN; /* for safety */
-
-                  /* Free the text pointer (this is the old read_buffer on
-                   * success)
-                   */
-                  png_free(png_ptr, text);
-
-                  /* This really is very benign, but it's still an error because
-                   * the extra space may otherwise be used as a Trojan Horse.
-                   */
-                  if (ret == Z_STREAM_END &&
-                      chunklength - prefix_size != lzsize)
-                     png_chunk_benign_error(png_ptr, "extra compressed data");
-               }
-
-               else
-               {
-                  /* Out of memory allocating the buffer */
-                  ret = Z_MEM_ERROR;
-                  png_zstream_error(png_ptr, Z_MEM_ERROR);
-               }
-            }
-
-            else
-            {
-               /* inflateReset failed, store the error message */
-               png_zstream_error(png_ptr, ret);
-               ret = PNG_UNEXPECTED_ZLIB_RETURN;
-            }
-         }
-
-         else if (ret == Z_OK)
-            ret = PNG_UNEXPECTED_ZLIB_RETURN;
-
-         /* Release the claimed stream */
-         png_ptr->zowner = 0;
-      }
-
-      else /* the claim failed */ if (ret == Z_STREAM_END) /* impossible! */
-         ret = PNG_UNEXPECTED_ZLIB_RETURN;
-
-      return ret;
-   }
-
-   else
-   {
-      /* Application/configuration limits exceeded */
-      png_zstream_error(png_ptr, Z_MEM_ERROR);
-      return Z_MEM_ERROR;
-   }
-}
-#endif /* READ_zTXt || READ_iTXt */
-#endif /* READ_COMPRESSED_TEXT */
-
-#ifdef PNG_READ_iCCP_SUPPORTED
-/* Perform a partial read and decompress, producing 'avail_out' bytes and
- * reading from the current chunk as required.
- */
-static int
-png_inflate_read(png_structrp png_ptr, png_bytep read_buffer, uInt read_size,
-    png_uint_32p chunk_bytes, png_bytep next_out, png_alloc_size_t *out_size,
-    int finish)
-{
-   if (png_ptr->zowner == png_ptr->chunk_name)
-   {
-      int ret;
-
-      /* next_in and avail_in must have been initialized by the caller. */
-      png_ptr->zstream.next_out = next_out;
-      png_ptr->zstream.avail_out = 0; /* set in the loop */
-
-      do
-      {
-         if (png_ptr->zstream.avail_in == 0)
-         {
-            if (read_size > *chunk_bytes)
-               read_size = (uInt)*chunk_bytes;
-            *chunk_bytes -= read_size;
-
-            if (read_size > 0)
-               png_crc_read(png_ptr, read_buffer, read_size);
-
-            png_ptr->zstream.next_in = read_buffer;
-            png_ptr->zstream.avail_in = read_size;
-         }
-
-         if (png_ptr->zstream.avail_out == 0)
-         {
-            uInt avail = ZLIB_IO_MAX;
-            if (avail > *out_size)
-               avail = (uInt)*out_size;
-            *out_size -= avail;
-
-            png_ptr->zstream.avail_out = avail;
-         }
-
-         /* Use Z_SYNC_FLUSH when there is no more chunk data to ensure that all
-          * the available output is produced; this allows reading of truncated
-          * streams.
-          */
-         ret = PNG_INFLATE(png_ptr, *chunk_bytes > 0 ?
-             Z_NO_FLUSH : (finish ? Z_FINISH : Z_SYNC_FLUSH));
-      }
-      while (ret == Z_OK && (*out_size > 0 || png_ptr->zstream.avail_out > 0));
-
-      *out_size += png_ptr->zstream.avail_out;
-      png_ptr->zstream.avail_out = 0; /* Should not be required, but is safe */
-
-      /* Ensure the error message pointer is always set: */
-      png_zstream_error(png_ptr, ret);
-      return ret;
-   }
-
-   else
-   {
-      png_ptr->zstream.msg = PNGZ_MSG_CAST("zstream unclaimed");
-      return Z_STREAM_ERROR;
-   }
-}
-#endif /* READ_iCCP */
-
-/* Read and check the IDHR chunk */
-
-void /* PRIVATE */
-png_handle_IHDR(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_byte buf[13];
-   png_uint_32 width, height;
-   int bit_depth, color_type, compression_type, filter_type;
-   int interlace_type;
-
-   png_debug(1, "in png_handle_IHDR");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) != 0)
-      png_chunk_error(png_ptr, "out of place");
-
-   /* Check the length */
-   if (length != 13)
-      png_chunk_error(png_ptr, "invalid");
-
-   png_ptr->mode |= PNG_HAVE_IHDR;
-
-   png_crc_read(png_ptr, buf, 13);
-   png_crc_finish(png_ptr, 0);
-
-   width = png_get_uint_31(png_ptr, buf);
-   height = png_get_uint_31(png_ptr, buf + 4);
-   bit_depth = buf[8];
-   color_type = buf[9];
-   compression_type = buf[10];
-   filter_type = buf[11];
-   interlace_type = buf[12];
-
-   /* Set internal variables */
-   png_ptr->width = width;
-   png_ptr->height = height;
-   png_ptr->bit_depth = (png_byte)bit_depth;
-   png_ptr->interlaced = (png_byte)interlace_type;
-   png_ptr->color_type = (png_byte)color_type;
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-   png_ptr->filter_type = (png_byte)filter_type;
-#endif
-   png_ptr->compression_type = (png_byte)compression_type;
-
-   /* Find number of channels */
-   switch (png_ptr->color_type)
-   {
-      default: /* invalid, png_set_IHDR calls png_error */
-      case PNG_COLOR_TYPE_GRAY:
-      case PNG_COLOR_TYPE_PALETTE:
-         png_ptr->channels = 1;
-         break;
-
-      case PNG_COLOR_TYPE_RGB:
-         png_ptr->channels = 3;
-         break;
-
-      case PNG_COLOR_TYPE_GRAY_ALPHA:
-         png_ptr->channels = 2;
-         break;
-
-      case PNG_COLOR_TYPE_RGB_ALPHA:
-         png_ptr->channels = 4;
-         break;
-   }
-
-   /* Set up other useful info */
-   png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth * png_ptr->channels);
-   png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width);
-   png_debug1(3, "bit_depth = %d", png_ptr->bit_depth);
-   png_debug1(3, "channels = %d", png_ptr->channels);
-   png_debug1(3, "rowbytes = %lu", (unsigned long)png_ptr->rowbytes);
-   png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
-       color_type, interlace_type, compression_type, filter_type);
-}
-
-/* Read and check the palette */
-void /* PRIVATE */
-png_handle_PLTE(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_color palette[PNG_MAX_PALETTE_LENGTH];
-   int max_palette_length, num, i;
-#ifdef PNG_POINTER_INDEXING_SUPPORTED
-   png_colorp pal_ptr;
-#endif
-
-   png_debug(1, "in png_handle_PLTE");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   /* Moved to before the 'after IDAT' check below because otherwise duplicate
-    * PLTE chunks are potentially ignored (the spec says there shall not be more
-    * than one PLTE, the error is not treated as benign, so this check trumps
-    * the requirement that PLTE appears before IDAT.)
-    */
-   else if ((png_ptr->mode & PNG_HAVE_PLTE) != 0)
-      png_chunk_error(png_ptr, "duplicate");
-
-   else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
-   {
-      /* This is benign because the non-benign error happened before, when an
-       * IDAT was encountered in a color-mapped image with no PLTE.
-       */
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-   png_ptr->mode |= PNG_HAVE_PLTE;
-
-   if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) == 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "ignored in grayscale PNG");
-      return;
-   }
-
-#ifndef PNG_READ_OPT_PLTE_SUPPORTED
-   if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
-   {
-      png_crc_finish(png_ptr, length);
-      return;
-   }
-#endif
-
-   if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3)
-   {
-      png_crc_finish(png_ptr, length);
-
-      if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
-         png_chunk_benign_error(png_ptr, "invalid");
-
-      else
-         png_chunk_error(png_ptr, "invalid");
-
-      return;
-   }
-
-   /* The cast is safe because 'length' is less than 3*PNG_MAX_PALETTE_LENGTH */
-   num = (int)length / 3;
-
-   /* If the palette has 256 or fewer entries but is too large for the bit
-    * depth, we don't issue an error, to preserve the behavior of previous
-    * libpng versions. We silently truncate the unused extra palette entries
-    * here.
-    */
-   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      max_palette_length = (1 << png_ptr->bit_depth);
-   else
-      max_palette_length = PNG_MAX_PALETTE_LENGTH;
-
-   if (num > max_palette_length)
-      num = max_palette_length;
-
-#ifdef PNG_POINTER_INDEXING_SUPPORTED
-   for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++)
-   {
-      png_byte buf[3];
-
-      png_crc_read(png_ptr, buf, 3);
-      pal_ptr->red = buf[0];
-      pal_ptr->green = buf[1];
-      pal_ptr->blue = buf[2];
-   }
-#else
-   for (i = 0; i < num; i++)
-   {
-      png_byte buf[3];
-
-      png_crc_read(png_ptr, buf, 3);
-      /* Don't depend upon png_color being any order */
-      palette[i].red = buf[0];
-      palette[i].green = buf[1];
-      palette[i].blue = buf[2];
-   }
-#endif
-
-   /* If we actually need the PLTE chunk (ie for a paletted image), we do
-    * whatever the normal CRC configuration tells us.  However, if we
-    * have an RGB image, the PLTE can be considered ancillary, so
-    * we will act as though it is.
-    */
-#ifndef PNG_READ_OPT_PLTE_SUPPORTED
-   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-#endif
-   {
-      png_crc_finish(png_ptr, (png_uint_32) (length - (unsigned int)num * 3));
-   }
-
-#ifndef PNG_READ_OPT_PLTE_SUPPORTED
-   else if (png_crc_error(png_ptr) != 0)  /* Only if we have a CRC error */
-   {
-      /* If we don't want to use the data from an ancillary chunk,
-       * we have two options: an error abort, or a warning and we
-       * ignore the data in this chunk (which should be OK, since
-       * it's considered ancillary for a RGB or RGBA image).
-       *
-       * IMPLEMENTATION NOTE: this is only here because png_crc_finish uses the
-       * chunk type to determine whether to check the ancillary or the critical
-       * flags.
-       */
-      if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_USE) == 0)
-      {
-         if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) != 0)
-            return;
-
-         else
-            png_chunk_error(png_ptr, "CRC error");
-      }
-
-      /* Otherwise, we (optionally) emit a warning and use the chunk. */
-      else if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) == 0)
-         png_chunk_warning(png_ptr, "CRC error");
-   }
-#endif
-
-   /* TODO: png_set_PLTE has the side effect of setting png_ptr->palette to its
-    * own copy of the palette.  This has the side effect that when png_start_row
-    * is called (this happens after any call to png_read_update_info) the
-    * info_ptr palette gets changed.  This is extremely unexpected and
-    * confusing.
-    *
-    * Fix this by not sharing the palette in this way.
-    */
-   png_set_PLTE(png_ptr, info_ptr, palette, num);
-
-   /* The three chunks, bKGD, hIST and tRNS *must* appear after PLTE and before
-    * IDAT.  Prior to 1.6.0 this was not checked; instead the code merely
-    * checked the apparent validity of a tRNS chunk inserted before PLTE on a
-    * palette PNG.  1.6.0 attempts to rigorously follow the standard and
-    * therefore does a benign error if the erroneous condition is detected *and*
-    * cancels the tRNS if the benign error returns.  The alternative is to
-    * amend the standard since it would be rather hypocritical of the standards
-    * maintainers to ignore it.
-    */
-#ifdef PNG_READ_tRNS_SUPPORTED
-   if (png_ptr->num_trans > 0 ||
-       (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS) != 0))
-   {
-      /* Cancel this because otherwise it would be used if the transforms
-       * require it.  Don't cancel the 'valid' flag because this would prevent
-       * detection of duplicate chunks.
-       */
-      png_ptr->num_trans = 0;
-
-      if (info_ptr != NULL)
-         info_ptr->num_trans = 0;
-
-      png_chunk_benign_error(png_ptr, "tRNS must be after");
-   }
-#endif
-
-#ifdef PNG_READ_hIST_SUPPORTED
-   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST) != 0)
-      png_chunk_benign_error(png_ptr, "hIST must be after");
-#endif
-
-#ifdef PNG_READ_bKGD_SUPPORTED
-   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) != 0)
-      png_chunk_benign_error(png_ptr, "bKGD must be after");
-#endif
-}
-
-void /* PRIVATE */
-png_handle_IEND(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_debug(1, "in png_handle_IEND");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0 ||
-       (png_ptr->mode & PNG_HAVE_IDAT) == 0)
-      png_chunk_error(png_ptr, "out of place");
-
-   png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND);
-
-   png_crc_finish(png_ptr, length);
-
-   if (length != 0)
-      png_chunk_benign_error(png_ptr, "invalid");
-
-   PNG_UNUSED(info_ptr)
-}
-
-#ifdef PNG_READ_gAMA_SUPPORTED
-void /* PRIVATE */
-png_handle_gAMA(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_fixed_point igamma;
-   png_byte buf[4];
-
-   png_debug(1, "in png_handle_gAMA");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if ((png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-   if (length != 4)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "invalid");
-      return;
-   }
-
-   png_crc_read(png_ptr, buf, 4);
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   igamma = png_get_fixed_point(NULL, buf);
-
-   png_colorspace_set_gamma(png_ptr, &png_ptr->colorspace, igamma);
-   png_colorspace_sync(png_ptr, info_ptr);
-}
-#endif
-
-#ifdef PNG_READ_sBIT_SUPPORTED
-void /* PRIVATE */
-png_handle_sBIT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   unsigned int truelen, i;
-   png_byte sample_depth;
-   png_byte buf[4];
-
-   png_debug(1, "in png_handle_sBIT");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if ((png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "duplicate");
-      return;
-   }
-
-   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-   {
-      truelen = 3;
-      sample_depth = 8;
-   }
-
-   else
-   {
-      truelen = png_ptr->channels;
-      sample_depth = png_ptr->bit_depth;
-   }
-
-   if (length != truelen || length > 4)
-   {
-      png_chunk_benign_error(png_ptr, "invalid");
-      png_crc_finish(png_ptr, length);
-      return;
-   }
-
-   buf[0] = buf[1] = buf[2] = buf[3] = sample_depth;
-   png_crc_read(png_ptr, buf, truelen);
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   for (i=0; i<truelen; ++i)
-   {
-      if (buf[i] == 0 || buf[i] > sample_depth)
-      {
-         png_chunk_benign_error(png_ptr, "invalid");
-         return;
-      }
-   }
-
-   if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
-   {
-      png_ptr->sig_bit.red = buf[0];
-      png_ptr->sig_bit.green = buf[1];
-      png_ptr->sig_bit.blue = buf[2];
-      png_ptr->sig_bit.alpha = buf[3];
-   }
-
-   else
-   {
-      png_ptr->sig_bit.gray = buf[0];
-      png_ptr->sig_bit.red = buf[0];
-      png_ptr->sig_bit.green = buf[0];
-      png_ptr->sig_bit.blue = buf[0];
-      png_ptr->sig_bit.alpha = buf[1];
-   }
-
-   png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit));
-}
-#endif
-
-#ifdef PNG_READ_cHRM_SUPPORTED
-void /* PRIVATE */
-png_handle_cHRM(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_byte buf[32];
-   png_xy xy;
-
-   png_debug(1, "in png_handle_cHRM");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if ((png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-   if (length != 32)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "invalid");
-      return;
-   }
-
-   png_crc_read(png_ptr, buf, 32);
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   xy.whitex = png_get_fixed_point(NULL, buf);
-   xy.whitey = png_get_fixed_point(NULL, buf + 4);
-   xy.redx   = png_get_fixed_point(NULL, buf + 8);
-   xy.redy   = png_get_fixed_point(NULL, buf + 12);
-   xy.greenx = png_get_fixed_point(NULL, buf + 16);
-   xy.greeny = png_get_fixed_point(NULL, buf + 20);
-   xy.bluex  = png_get_fixed_point(NULL, buf + 24);
-   xy.bluey  = png_get_fixed_point(NULL, buf + 28);
-
-   if (xy.whitex == PNG_FIXED_ERROR ||
-       xy.whitey == PNG_FIXED_ERROR ||
-       xy.redx   == PNG_FIXED_ERROR ||
-       xy.redy   == PNG_FIXED_ERROR ||
-       xy.greenx == PNG_FIXED_ERROR ||
-       xy.greeny == PNG_FIXED_ERROR ||
-       xy.bluex  == PNG_FIXED_ERROR ||
-       xy.bluey  == PNG_FIXED_ERROR)
-   {
-      png_chunk_benign_error(png_ptr, "invalid values");
-      return;
-   }
-
-   /* If a colorspace error has already been output skip this chunk */
-   if ((png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) != 0)
-      return;
-
-   if ((png_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) != 0)
-   {
-      png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID;
-      png_colorspace_sync(png_ptr, info_ptr);
-      png_chunk_benign_error(png_ptr, "duplicate");
-      return;
-   }
-
-   png_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
-   (void)png_colorspace_set_chromaticities(png_ptr, &png_ptr->colorspace, &xy,
-       1/*prefer cHRM values*/);
-   png_colorspace_sync(png_ptr, info_ptr);
-}
-#endif
-
-#ifdef PNG_READ_sRGB_SUPPORTED
-void /* PRIVATE */
-png_handle_sRGB(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_byte intent;
-
-   png_debug(1, "in png_handle_sRGB");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if ((png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-   if (length != 1)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "invalid");
-      return;
-   }
-
-   png_crc_read(png_ptr, &intent, 1);
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   /* If a colorspace error has already been output skip this chunk */
-   if ((png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) != 0)
-      return;
-
-   /* Only one sRGB or iCCP chunk is allowed, use the HAVE_INTENT flag to detect
-    * this.
-    */
-   if ((png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_INTENT) != 0)
-   {
-      png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID;
-      png_colorspace_sync(png_ptr, info_ptr);
-      png_chunk_benign_error(png_ptr, "too many profiles");
-      return;
-   }
-
-   (void)png_colorspace_set_sRGB(png_ptr, &png_ptr->colorspace, intent);
-   png_colorspace_sync(png_ptr, info_ptr);
-}
-#endif /* READ_sRGB */
-
-#ifdef PNG_READ_iCCP_SUPPORTED
-void /* PRIVATE */
-png_handle_iCCP(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-/* Note: this does not properly handle profiles that are > 64K under DOS */
-{
-   png_const_charp errmsg = NULL; /* error message output, or no error */
-   int finished = 0; /* crc checked */
-
-   png_debug(1, "in png_handle_iCCP");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if ((png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-   /* Consistent with all the above colorspace handling an obviously *invalid*
-    * chunk is just ignored, so does not invalidate the color space.  An
-    * alternative is to set the 'invalid' flags at the start of this routine
-    * and only clear them in they were not set before and all the tests pass.
-    */
-
-   /* The keyword must be at least one character and there is a
-    * terminator (0) byte and the compression method byte, and the
-    * 'zlib' datastream is at least 11 bytes.
-    */
-   if (length < 14)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "too short");
-      return;
-   }
-
-   /* If a colorspace error has already been output skip this chunk */
-   if ((png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      return;
-   }
-
-   /* Only one sRGB or iCCP chunk is allowed, use the HAVE_INTENT flag to detect
-    * this.
-    */
-   if ((png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_INTENT) == 0)
-   {
-      uInt read_length, keyword_length;
-      char keyword[81];
-
-      /* Find the keyword; the keyword plus separator and compression method
-       * bytes can be at most 81 characters long.
-       */
-      read_length = 81; /* maximum */
-      if (read_length > length)
-         read_length = (uInt)length;
-
-      png_crc_read(png_ptr, (png_bytep)keyword, read_length);
-      length -= read_length;
-
-      /* The minimum 'zlib' stream is assumed to be just the 2 byte header,
-       * 5 bytes minimum 'deflate' stream, and the 4 byte checksum.
-       */
-      if (length < 11)
-      {
-         png_crc_finish(png_ptr, length);
-         png_chunk_benign_error(png_ptr, "too short");
-         return;
-      }
-
-      keyword_length = 0;
-      while (keyword_length < 80 && keyword_length < read_length &&
-         keyword[keyword_length] != 0)
-         ++keyword_length;
-
-      /* TODO: make the keyword checking common */
-      if (keyword_length >= 1 && keyword_length <= 79)
-      {
-         /* We only understand '0' compression - deflate - so if we get a
-          * different value we can't safely decode the chunk.
-          */
-         if (keyword_length+1 < read_length &&
-            keyword[keyword_length+1] == PNG_COMPRESSION_TYPE_BASE)
-         {
-            read_length -= keyword_length+2;
-
-            if (png_inflate_claim(png_ptr, png_iCCP) == Z_OK)
-            {
-               Byte profile_header[132]={0};
-               Byte local_buffer[PNG_INFLATE_BUF_SIZE];
-               png_alloc_size_t size = (sizeof profile_header);
-
-               png_ptr->zstream.next_in = (Bytef*)keyword + (keyword_length+2);
-               png_ptr->zstream.avail_in = read_length;
-               (void)png_inflate_read(png_ptr, local_buffer,
-                   (sizeof local_buffer), &length, profile_header, &size,
-                   0/*finish: don't, because the output is too small*/);
-
-               if (size == 0)
-               {
-                  /* We have the ICC profile header; do the basic header checks.
-                   */
-                  const png_uint_32 profile_length =
-                     png_get_uint_32(profile_header);
-
-                  if (png_icc_check_length(png_ptr, &png_ptr->colorspace,
-                      keyword, profile_length) != 0)
-                  {
-                     /* The length is apparently ok, so we can check the 132
-                      * byte header.
-                      */
-                     if (png_icc_check_header(png_ptr, &png_ptr->colorspace,
-                         keyword, profile_length, profile_header,
-                         png_ptr->color_type) != 0)
-                     {
-                        /* Now read the tag table; a variable size buffer is
-                         * needed at this point, allocate one for the whole
-                         * profile.  The header check has already validated
-                         * that none of this stuff will overflow.
-                         */
-                        const png_uint_32 tag_count = png_get_uint_32(
-                            profile_header+128);
-                        png_bytep profile = png_read_buffer(png_ptr,
-                            profile_length, 2/*silent*/);
-
-                        if (profile != NULL)
-                        {
-                           memcpy(profile, profile_header,
-                               (sizeof profile_header));
-
-                           size = 12 * tag_count;
-
-                           (void)png_inflate_read(png_ptr, local_buffer,
-                               (sizeof local_buffer), &length,
-                               profile + (sizeof profile_header), &size, 0);
-
-                           /* Still expect a buffer error because we expect
-                            * there to be some tag data!
-                            */
-                           if (size == 0)
-                           {
-                              if (png_icc_check_tag_table(png_ptr,
-                                  &png_ptr->colorspace, keyword, profile_length,
-                                  profile) != 0)
-                              {
-                                 /* The profile has been validated for basic
-                                  * security issues, so read the whole thing in.
-                                  */
-                                 size = profile_length - (sizeof profile_header)
-                                     - 12 * tag_count;
-
-                                 (void)png_inflate_read(png_ptr, local_buffer,
-                                     (sizeof local_buffer), &length,
-                                     profile + (sizeof profile_header) +
-                                     12 * tag_count, &size, 1/*finish*/);
-
-                                 if (length > 0 && !(png_ptr->flags &
-                                     PNG_FLAG_BENIGN_ERRORS_WARN))
-                                    errmsg = "extra compressed data";
-
-                                 /* But otherwise allow extra data: */
-                                 else if (size == 0)
-                                 {
-                                    if (length > 0)
-                                    {
-                                       /* This can be handled completely, so
-                                        * keep going.
-                                        */
-                                       png_chunk_warning(png_ptr,
-                                           "extra compressed data");
-                                    }
-
-                                    png_crc_finish(png_ptr, length);
-                                    finished = 1;
-
-# if defined(PNG_sRGB_SUPPORTED) && PNG_sRGB_PROFILE_CHECKS >= 0
-                                    /* Check for a match against sRGB */
-                                    png_icc_set_sRGB(png_ptr,
-                                        &png_ptr->colorspace, profile,
-                                        png_ptr->zstream.adler);
-# endif
-
-                                    /* Steal the profile for info_ptr. */
-                                    if (info_ptr != NULL)
-                                    {
-                                       png_free_data(png_ptr, info_ptr,
-                                           PNG_FREE_ICCP, 0);
-
-                                       info_ptr->iccp_name = png_voidcast(char*,
-                                           png_malloc_base(png_ptr,
-                                           keyword_length+1));
-                                       if (info_ptr->iccp_name != NULL)
-                                       {
-                                          memcpy(info_ptr->iccp_name, keyword,
-                                              keyword_length+1);
-                                          info_ptr->iccp_proflen =
-                                              profile_length;
-                                          info_ptr->iccp_profile = profile;
-                                          png_ptr->read_buffer = NULL; /*steal*/
-                                          info_ptr->free_me |= PNG_FREE_ICCP;
-                                          info_ptr->valid |= PNG_INFO_iCCP;
-                                       }
-
-                                       else
-                                       {
-                                          png_ptr->colorspace.flags |=
-                                             PNG_COLORSPACE_INVALID;
-                                          errmsg = "out of memory";
-                                       }
-                                    }
-
-                                    /* else the profile remains in the read
-                                     * buffer which gets reused for subsequent
-                                     * chunks.
-                                     */
-
-                                    if (info_ptr != NULL)
-                                       png_colorspace_sync(png_ptr, info_ptr);
-
-                                    if (errmsg == NULL)
-                                    {
-                                       png_ptr->zowner = 0;
-                                       return;
-                                    }
-                                 }
-                                 if (errmsg == NULL)
-                                    errmsg = png_ptr->zstream.msg;
-                              }
-                              /* else png_icc_check_tag_table output an error */
-                           }
-                           else /* profile truncated */
-                              errmsg = png_ptr->zstream.msg;
-                        }
-
-                        else
-                           errmsg = "out of memory";
-                     }
-
-                     /* else png_icc_check_header output an error */
-                  }
-
-                  /* else png_icc_check_length output an error */
-               }
-
-               else /* profile truncated */
-                  errmsg = png_ptr->zstream.msg;
-
-               /* Release the stream */
-               png_ptr->zowner = 0;
-            }
-
-            else /* png_inflate_claim failed */
-               errmsg = png_ptr->zstream.msg;
-         }
-
-         else
-            errmsg = "bad compression method"; /* or missing */
-      }
-
-      else
-         errmsg = "bad keyword";
-   }
-
-   else
-      errmsg = "too many profiles";
-
-   /* Failure: the reason is in 'errmsg' */
-   if (finished == 0)
-      png_crc_finish(png_ptr, length);
-
-   png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID;
-   png_colorspace_sync(png_ptr, info_ptr);
-   if (errmsg != NULL) /* else already output */
-      png_chunk_benign_error(png_ptr, errmsg);
-}
-#endif /* READ_iCCP */
-
-#ifdef PNG_READ_sPLT_SUPPORTED
-void /* PRIVATE */
-png_handle_sPLT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-/* Note: this does not properly handle chunks that are > 64K under DOS */
-{
-   png_bytep entry_start, buffer;
-   png_sPLT_t new_palette;
-   png_sPLT_entryp pp;
-   png_uint_32 data_length;
-   int entry_size, i;
-   png_uint_32 skip = 0;
-   png_uint_32 dl;
-   png_size_t max_dl;
-
-   png_debug(1, "in png_handle_sPLT");
-
-#ifdef PNG_USER_LIMITS_SUPPORTED
-   if (png_ptr->user_chunk_cache_max != 0)
-   {
-      if (png_ptr->user_chunk_cache_max == 1)
-      {
-         png_crc_finish(png_ptr, length);
-         return;
-      }
-
-      if (--png_ptr->user_chunk_cache_max == 1)
-      {
-         png_warning(png_ptr, "No space in chunk cache for sPLT");
-         png_crc_finish(png_ptr, length);
-         return;
-      }
-   }
-#endif
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-#ifdef PNG_MAX_MALLOC_64K
-   if (length > 65535U)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "too large to fit in memory");
-      return;
-   }
-#endif
-
-   buffer = png_read_buffer(png_ptr, length+1, 2/*silent*/);
-   if (buffer == NULL)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of memory");
-      return;
-   }
-
-
-   /* WARNING: this may break if size_t is less than 32 bits; it is assumed
-    * that the PNG_MAX_MALLOC_64K test is enabled in this case, but this is a
-    * potential breakage point if the types in pngconf.h aren't exactly right.
-    */
-   png_crc_read(png_ptr, buffer, length);
-
-   if (png_crc_finish(png_ptr, skip) != 0)
-      return;
-
-   buffer[length] = 0;
-
-   for (entry_start = buffer; *entry_start; entry_start++)
-      /* Empty loop to find end of name */ ;
-
-   ++entry_start;
-
-   /* A sample depth should follow the separator, and we should be on it  */
-   if (length < 2U || entry_start > buffer + (length - 2U))
-   {
-      png_warning(png_ptr, "malformed sPLT chunk");
-      return;
-   }
-
-   new_palette.depth = *entry_start++;
-   entry_size = (new_palette.depth == 8 ? 6 : 10);
-   /* This must fit in a png_uint_32 because it is derived from the original
-    * chunk data length.
-    */
-   data_length = length - (png_uint_32)(entry_start - buffer);
-
-   /* Integrity-check the data length */
-   if ((data_length % (unsigned int)entry_size) != 0)
-   {
-      png_warning(png_ptr, "sPLT chunk has bad length");
-      return;
-   }
-
-   dl = (png_uint_32)(data_length / (unsigned int)entry_size);
-   max_dl = PNG_SIZE_MAX / (sizeof (png_sPLT_entry));
-
-   if (dl > max_dl)
-   {
-      png_warning(png_ptr, "sPLT chunk too long");
-      return;
-   }
-
-   new_palette.nentries = (png_int_32)(data_length / (unsigned int)entry_size);
-
-   new_palette.entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
-       (png_alloc_size_t) new_palette.nentries * (sizeof (png_sPLT_entry)));
-
-   if (new_palette.entries == NULL)
-   {
-      png_warning(png_ptr, "sPLT chunk requires too much memory");
-      return;
-   }
-
-#ifdef PNG_POINTER_INDEXING_SUPPORTED
-   for (i = 0; i < new_palette.nentries; i++)
-   {
-      pp = new_palette.entries + i;
-
-      if (new_palette.depth == 8)
-      {
-         pp->red = *entry_start++;
-         pp->green = *entry_start++;
-         pp->blue = *entry_start++;
-         pp->alpha = *entry_start++;
-      }
-
-      else
-      {
-         pp->red   = png_get_uint_16(entry_start); entry_start += 2;
-         pp->green = png_get_uint_16(entry_start); entry_start += 2;
-         pp->blue  = png_get_uint_16(entry_start); entry_start += 2;
-         pp->alpha = png_get_uint_16(entry_start); entry_start += 2;
-      }
-
-      pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
-   }
-#else
-   pp = new_palette.entries;
-
-   for (i = 0; i < new_palette.nentries; i++)
-   {
-
-      if (new_palette.depth == 8)
-      {
-         pp[i].red   = *entry_start++;
-         pp[i].green = *entry_start++;
-         pp[i].blue  = *entry_start++;
-         pp[i].alpha = *entry_start++;
-      }
-
-      else
-      {
-         pp[i].red   = png_get_uint_16(entry_start); entry_start += 2;
-         pp[i].green = png_get_uint_16(entry_start); entry_start += 2;
-         pp[i].blue  = png_get_uint_16(entry_start); entry_start += 2;
-         pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2;
-      }
-
-      pp[i].frequency = png_get_uint_16(entry_start); entry_start += 2;
-   }
-#endif
-
-   /* Discard all chunk data except the name and stash that */
-   new_palette.name = (png_charp)buffer;
-
-   png_set_sPLT(png_ptr, info_ptr, &new_palette, 1);
-
-   png_free(png_ptr, new_palette.entries);
-}
-#endif /* READ_sPLT */
-
-#ifdef PNG_READ_tRNS_SUPPORTED
-void /* PRIVATE */
-png_handle_tRNS(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_byte readbuf[PNG_MAX_PALETTE_LENGTH];
-
-   png_debug(1, "in png_handle_tRNS");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "duplicate");
-      return;
-   }
-
-   if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
-   {
-      png_byte buf[2];
-
-      if (length != 2)
-      {
-         png_crc_finish(png_ptr, length);
-         png_chunk_benign_error(png_ptr, "invalid");
-         return;
-      }
-
-      png_crc_read(png_ptr, buf, 2);
-      png_ptr->num_trans = 1;
-      png_ptr->trans_color.gray = png_get_uint_16(buf);
-   }
-
-   else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
-   {
-      png_byte buf[6];
-
-      if (length != 6)
-      {
-         png_crc_finish(png_ptr, length);
-         png_chunk_benign_error(png_ptr, "invalid");
-         return;
-      }
-
-      png_crc_read(png_ptr, buf, length);
-      png_ptr->num_trans = 1;
-      png_ptr->trans_color.red = png_get_uint_16(buf);
-      png_ptr->trans_color.green = png_get_uint_16(buf + 2);
-      png_ptr->trans_color.blue = png_get_uint_16(buf + 4);
-   }
-
-   else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-   {
-      if ((png_ptr->mode & PNG_HAVE_PLTE) == 0)
-      {
-         /* TODO: is this actually an error in the ISO spec? */
-         png_crc_finish(png_ptr, length);
-         png_chunk_benign_error(png_ptr, "out of place");
-         return;
-      }
-
-      if (length > (unsigned int) png_ptr->num_palette ||
-         length > (unsigned int) PNG_MAX_PALETTE_LENGTH ||
-         length == 0)
-      {
-         png_crc_finish(png_ptr, length);
-         png_chunk_benign_error(png_ptr, "invalid");
-         return;
-      }
-
-      png_crc_read(png_ptr, readbuf, length);
-      png_ptr->num_trans = (png_uint_16)length;
-   }
-
-   else
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "invalid with alpha channel");
-      return;
-   }
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-   {
-      png_ptr->num_trans = 0;
-      return;
-   }
-
-   /* TODO: this is a horrible side effect in the palette case because the
-    * png_struct ends up with a pointer to the tRNS buffer owned by the
-    * png_info.  Fix this.
-    */
-   png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans,
-       &(png_ptr->trans_color));
-}
-#endif
-
-#ifdef PNG_READ_bKGD_SUPPORTED
-void /* PRIVATE */
-png_handle_bKGD(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   unsigned int truelen;
-   png_byte buf[6];
-   png_color_16 background;
-
-   png_debug(1, "in png_handle_bKGD");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0 ||
-       (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
-       (png_ptr->mode & PNG_HAVE_PLTE) == 0))
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "duplicate");
-      return;
-   }
-
-   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      truelen = 1;
-
-   else if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
-      truelen = 6;
-
-   else
-      truelen = 2;
-
-   if (length != truelen)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "invalid");
-      return;
-   }
-
-   png_crc_read(png_ptr, buf, truelen);
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   /* We convert the index value into RGB components so that we can allow
-    * arbitrary RGB values for background when we have transparency, and
-    * so it is easy to determine the RGB values of the background color
-    * from the info_ptr struct.
-    */
-   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-   {
-      background.index = buf[0];
-
-      if (info_ptr != NULL && info_ptr->num_palette != 0)
-      {
-         if (buf[0] >= info_ptr->num_palette)
-         {
-            png_chunk_benign_error(png_ptr, "invalid index");
-            return;
-         }
-
-         background.red = (png_uint_16)png_ptr->palette[buf[0]].red;
-         background.green = (png_uint_16)png_ptr->palette[buf[0]].green;
-         background.blue = (png_uint_16)png_ptr->palette[buf[0]].blue;
-      }
-
-      else
-         background.red = background.green = background.blue = 0;
-
-      background.gray = 0;
-   }
-
-   else if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) == 0) /* GRAY */
-   {
-      background.index = 0;
-      background.red =
-      background.green =
-      background.blue =
-      background.gray = png_get_uint_16(buf);
-   }
-
-   else
-   {
-      background.index = 0;
-      background.red = png_get_uint_16(buf);
-      background.green = png_get_uint_16(buf + 2);
-      background.blue = png_get_uint_16(buf + 4);
-      background.gray = 0;
-   }
-
-   png_set_bKGD(png_ptr, info_ptr, &background);
-}
-#endif
-
-#ifdef PNG_READ_eXIf_SUPPORTED
-void /* PRIVATE */
-png_handle_eXIf(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   unsigned int i;
-
-   png_debug(1, "in png_handle_eXIf");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   if (length < 2)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "too short");
-      return;
-   }
-
-   else if (info_ptr == NULL || (info_ptr->valid & PNG_INFO_eXIf) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "duplicate");
-      return;
-   }
-
-   info_ptr->free_me |= PNG_FREE_EXIF;
-
-   info_ptr->eXIf_buf = png_voidcast(png_bytep,
-             png_malloc_warn(png_ptr, length));
-
-   if (info_ptr->eXIf_buf == NULL)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of memory");
-      return;
-   }
-
-   for (i = 0; i < length; i++)
-   {
-      png_byte buf[1];
-      png_crc_read(png_ptr, buf, 1);
-      info_ptr->eXIf_buf[i] = buf[0];
-      if (i == 1 && buf[0] != 'M' && buf[0] != 'I'
-                 && info_ptr->eXIf_buf[0] != buf[0])
-      {
-         png_crc_finish(png_ptr, length);
-         png_chunk_benign_error(png_ptr, "incorrect byte-order specifier");
-         png_free(png_ptr, info_ptr->eXIf_buf);
-         info_ptr->eXIf_buf = NULL;
-         return;
-      }
-   }
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   png_set_eXIf_1(png_ptr, info_ptr, length, info_ptr->eXIf_buf);
-
-   png_free(png_ptr, info_ptr->eXIf_buf);
-   info_ptr->eXIf_buf = NULL;
-}
-#endif
-
-#ifdef PNG_READ_hIST_SUPPORTED
-void /* PRIVATE */
-png_handle_hIST(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   unsigned int num, i;
-   png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH];
-
-   png_debug(1, "in png_handle_hIST");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0 ||
-       (png_ptr->mode & PNG_HAVE_PLTE) == 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "duplicate");
-      return;
-   }
-
-   num = length / 2 ;
-
-   if (num != (unsigned int) png_ptr->num_palette ||
-       num > (unsigned int) PNG_MAX_PALETTE_LENGTH)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "invalid");
-      return;
-   }
-
-   for (i = 0; i < num; i++)
-   {
-      png_byte buf[2];
-
-      png_crc_read(png_ptr, buf, 2);
-      readbuf[i] = png_get_uint_16(buf);
-   }
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   png_set_hIST(png_ptr, info_ptr, readbuf);
-}
-#endif
-
-#ifdef PNG_READ_pHYs_SUPPORTED
-void /* PRIVATE */
-png_handle_pHYs(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_byte buf[9];
-   png_uint_32 res_x, res_y;
-   int unit_type;
-
-   png_debug(1, "in png_handle_pHYs");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "duplicate");
-      return;
-   }
-
-   if (length != 9)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "invalid");
-      return;
-   }
-
-   png_crc_read(png_ptr, buf, 9);
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   res_x = png_get_uint_32(buf);
-   res_y = png_get_uint_32(buf + 4);
-   unit_type = buf[8];
-   png_set_pHYs(png_ptr, info_ptr, res_x, res_y, unit_type);
-}
-#endif
-
-#ifdef PNG_READ_oFFs_SUPPORTED
-void /* PRIVATE */
-png_handle_oFFs(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_byte buf[9];
-   png_int_32 offset_x, offset_y;
-   int unit_type;
-
-   png_debug(1, "in png_handle_oFFs");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "duplicate");
-      return;
-   }
-
-   if (length != 9)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "invalid");
-      return;
-   }
-
-   png_crc_read(png_ptr, buf, 9);
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   offset_x = png_get_int_32(buf);
-   offset_y = png_get_int_32(buf + 4);
-   unit_type = buf[8];
-   png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y, unit_type);
-}
-#endif
-
-#ifdef PNG_READ_pCAL_SUPPORTED
-/* Read the pCAL chunk (described in the PNG Extensions document) */
-void /* PRIVATE */
-png_handle_pCAL(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_int_32 X0, X1;
-   png_byte type, nparams;
-   png_bytep buffer, buf, units, endptr;
-   png_charpp params;
-   int i;
-
-   png_debug(1, "in png_handle_pCAL");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "duplicate");
-      return;
-   }
-
-   png_debug1(2, "Allocating and reading pCAL chunk data (%u bytes)",
-       length + 1);
-
-   buffer = png_read_buffer(png_ptr, length+1, 2/*silent*/);
-
-   if (buffer == NULL)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of memory");
-      return;
-   }
-
-   png_crc_read(png_ptr, buffer, length);
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   buffer[length] = 0; /* Null terminate the last string */
-
-   png_debug(3, "Finding end of pCAL purpose string");
-   for (buf = buffer; *buf; buf++)
-      /* Empty loop */ ;
-
-   endptr = buffer + length;
-
-   /* We need to have at least 12 bytes after the purpose string
-    * in order to get the parameter information.
-    */
-   if (endptr - buf <= 12)
-   {
-      png_chunk_benign_error(png_ptr, "invalid");
-      return;
-   }
-
-   png_debug(3, "Reading pCAL X0, X1, type, nparams, and units");
-   X0 = png_get_int_32((png_bytep)buf+1);
-   X1 = png_get_int_32((png_bytep)buf+5);
-   type = buf[9];
-   nparams = buf[10];
-   units = buf + 11;
-
-   png_debug(3, "Checking pCAL equation type and number of parameters");
-   /* Check that we have the right number of parameters for known
-    * equation types.
-    */
-   if ((type == PNG_EQUATION_LINEAR && nparams != 2) ||
-       (type == PNG_EQUATION_BASE_E && nparams != 3) ||
-       (type == PNG_EQUATION_ARBITRARY && nparams != 3) ||
-       (type == PNG_EQUATION_HYPERBOLIC && nparams != 4))
-   {
-      png_chunk_benign_error(png_ptr, "invalid parameter count");
-      return;
-   }
-
-   else if (type >= PNG_EQUATION_LAST)
-   {
-      png_chunk_benign_error(png_ptr, "unrecognized equation type");
-   }
-
-   for (buf = units; *buf; buf++)
-      /* Empty loop to move past the units string. */ ;
-
-   png_debug(3, "Allocating pCAL parameters array");
-
-   params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
-       nparams * (sizeof (png_charp))));
-
-   if (params == NULL)
-   {
-      png_chunk_benign_error(png_ptr, "out of memory");
-      return;
-   }
-
-   /* Get pointers to the start of each parameter string. */
-   for (i = 0; i < nparams; i++)
-   {
-      buf++; /* Skip the null string terminator from previous parameter. */
-
-      png_debug1(3, "Reading pCAL parameter %d", i);
-
-      for (params[i] = (png_charp)buf; buf <= endptr && *buf != 0; buf++)
-         /* Empty loop to move past each parameter string */ ;
-
-      /* Make sure we haven't run out of data yet */
-      if (buf > endptr)
-      {
-         png_free(png_ptr, params);
-         png_chunk_benign_error(png_ptr, "invalid data");
-         return;
-      }
-   }
-
-   png_set_pCAL(png_ptr, info_ptr, (png_charp)buffer, X0, X1, type, nparams,
-       (png_charp)units, params);
-
-   png_free(png_ptr, params);
-}
-#endif
-
-#ifdef PNG_READ_sCAL_SUPPORTED
-/* Read the sCAL chunk */
-void /* PRIVATE */
-png_handle_sCAL(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_bytep buffer;
-   png_size_t i;
-   int state;
-
-   png_debug(1, "in png_handle_sCAL");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of place");
-      return;
-   }
-
-   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "duplicate");
-      return;
-   }
-
-   /* Need unit type, width, \0, height: minimum 4 bytes */
-   else if (length < 4)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "invalid");
-      return;
-   }
-
-   png_debug1(2, "Allocating and reading sCAL chunk data (%u bytes)",
-       length + 1);
-
-   buffer = png_read_buffer(png_ptr, length+1, 2/*silent*/);
-
-   if (buffer == NULL)
-   {
-      png_chunk_benign_error(png_ptr, "out of memory");
-      png_crc_finish(png_ptr, length);
-      return;
-   }
-
-   png_crc_read(png_ptr, buffer, length);
-   buffer[length] = 0; /* Null terminate the last string */
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   /* Validate the unit. */
-   if (buffer[0] != 1 && buffer[0] != 2)
-   {
-      png_chunk_benign_error(png_ptr, "invalid unit");
-      return;
-   }
-
-   /* Validate the ASCII numbers, need two ASCII numbers separated by
-    * a '\0' and they need to fit exactly in the chunk data.
-    */
-   i = 1;
-   state = 0;
-
-   if (png_check_fp_number((png_const_charp)buffer, length, &state, &i) == 0 ||
-       i >= length || buffer[i++] != 0)
-      png_chunk_benign_error(png_ptr, "bad width format");
-
-   else if (PNG_FP_IS_POSITIVE(state) == 0)
-      png_chunk_benign_error(png_ptr, "non-positive width");
-
-   else
-   {
-      png_size_t heighti = i;
-
-      state = 0;
-      if (png_check_fp_number((png_const_charp)buffer, length,
-          &state, &i) == 0 || i != length)
-         png_chunk_benign_error(png_ptr, "bad height format");
-
-      else if (PNG_FP_IS_POSITIVE(state) == 0)
-         png_chunk_benign_error(png_ptr, "non-positive height");
-
-      else
-         /* This is the (only) success case. */
-         png_set_sCAL_s(png_ptr, info_ptr, buffer[0],
-             (png_charp)buffer+1, (png_charp)buffer+heighti);
-   }
-}
-#endif
-
-#ifdef PNG_READ_tIME_SUPPORTED
-void /* PRIVATE */
-png_handle_tIME(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_byte buf[7];
-   png_time mod_time;
-
-   png_debug(1, "in png_handle_tIME");
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME) != 0)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "duplicate");
-      return;
-   }
-
-   if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
-      png_ptr->mode |= PNG_AFTER_IDAT;
-
-   if (length != 7)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "invalid");
-      return;
-   }
-
-   png_crc_read(png_ptr, buf, 7);
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   mod_time.second = buf[6];
-   mod_time.minute = buf[5];
-   mod_time.hour = buf[4];
-   mod_time.day = buf[3];
-   mod_time.month = buf[2];
-   mod_time.year = png_get_uint_16(buf);
-
-   png_set_tIME(png_ptr, info_ptr, &mod_time);
-}
-#endif
-
-#ifdef PNG_READ_tEXt_SUPPORTED
-/* Note: this does not properly handle chunks that are > 64K under DOS */
-void /* PRIVATE */
-png_handle_tEXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_text  text_info;
-   png_bytep buffer;
-   png_charp key;
-   png_charp text;
-   png_uint_32 skip = 0;
-
-   png_debug(1, "in png_handle_tEXt");
-
-#ifdef PNG_USER_LIMITS_SUPPORTED
-   if (png_ptr->user_chunk_cache_max != 0)
-   {
-      if (png_ptr->user_chunk_cache_max == 1)
-      {
-         png_crc_finish(png_ptr, length);
-         return;
-      }
-
-      if (--png_ptr->user_chunk_cache_max == 1)
-      {
-         png_crc_finish(png_ptr, length);
-         png_chunk_benign_error(png_ptr, "no space in chunk cache");
-         return;
-      }
-   }
-#endif
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
-      png_ptr->mode |= PNG_AFTER_IDAT;
-
-#ifdef PNG_MAX_MALLOC_64K
-   if (length > 65535U)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "too large to fit in memory");
-      return;
-   }
-#endif
-
-   buffer = png_read_buffer(png_ptr, length+1, 1/*warn*/);
-
-   if (buffer == NULL)
-   {
-      png_chunk_benign_error(png_ptr, "out of memory");
-      return;
-   }
-
-   png_crc_read(png_ptr, buffer, length);
-
-   if (png_crc_finish(png_ptr, skip) != 0)
-      return;
-
-   key = (png_charp)buffer;
-   key[length] = 0;
-
-   for (text = key; *text; text++)
-      /* Empty loop to find end of key */ ;
-
-   if (text != key + length)
-      text++;
-
-   text_info.compression = PNG_TEXT_COMPRESSION_NONE;
-   text_info.key = key;
-   text_info.lang = NULL;
-   text_info.lang_key = NULL;
-   text_info.itxt_length = 0;
-   text_info.text = text;
-   text_info.text_length = strlen(text);
-
-   if (png_set_text_2(png_ptr, info_ptr, &text_info, 1) != 0)
-      png_warning(png_ptr, "Insufficient memory to process text chunk");
-}
-#endif
-
-#ifdef PNG_READ_zTXt_SUPPORTED
-/* Note: this does not correctly handle chunks that are > 64K under DOS */
-void /* PRIVATE */
-png_handle_zTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_const_charp errmsg = NULL;
-   png_bytep       buffer;
-   png_uint_32     keyword_length;
-
-   png_debug(1, "in png_handle_zTXt");
-
-#ifdef PNG_USER_LIMITS_SUPPORTED
-   if (png_ptr->user_chunk_cache_max != 0)
-   {
-      if (png_ptr->user_chunk_cache_max == 1)
-      {
-         png_crc_finish(png_ptr, length);
-         return;
-      }
-
-      if (--png_ptr->user_chunk_cache_max == 1)
-      {
-         png_crc_finish(png_ptr, length);
-         png_chunk_benign_error(png_ptr, "no space in chunk cache");
-         return;
-      }
-   }
-#endif
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
-      png_ptr->mode |= PNG_AFTER_IDAT;
-
-   /* Note, "length" is sufficient here; we won't be adding
-    * a null terminator later.
-    */
-   buffer = png_read_buffer(png_ptr, length, 2/*silent*/);
-
-   if (buffer == NULL)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of memory");
-      return;
-   }
-
-   png_crc_read(png_ptr, buffer, length);
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   /* TODO: also check that the keyword contents match the spec! */
-   for (keyword_length = 0;
-      keyword_length < length && buffer[keyword_length] != 0;
-      ++keyword_length)
-      /* Empty loop to find end of name */ ;
-
-   if (keyword_length > 79 || keyword_length < 1)
-      errmsg = "bad keyword";
-
-   /* zTXt must have some LZ data after the keyword, although it may expand to
-    * zero bytes; we need a '\0' at the end of the keyword, the compression type
-    * then the LZ data:
-    */
-   else if (keyword_length + 3 > length)
-      errmsg = "truncated";
-
-   else if (buffer[keyword_length+1] != PNG_COMPRESSION_TYPE_BASE)
-      errmsg = "unknown compression type";
-
-   else
-   {
-      png_alloc_size_t uncompressed_length = PNG_SIZE_MAX;
-
-      /* TODO: at present png_decompress_chunk imposes a single application
-       * level memory limit, this should be split to different values for iCCP
-       * and text chunks.
-       */
-      if (png_decompress_chunk(png_ptr, length, keyword_length+2,
-          &uncompressed_length, 1/*terminate*/) == Z_STREAM_END)
-      {
-         png_text text;
-
-         if (png_ptr->read_buffer == NULL)
-           errmsg="Read failure in png_handle_zTXt";
-         else
-         {
-            /* It worked; png_ptr->read_buffer now looks like a tEXt chunk
-             * except for the extra compression type byte and the fact that
-             * it isn't necessarily '\0' terminated.
-             */
-            buffer = png_ptr->read_buffer;
-            buffer[uncompressed_length+(keyword_length+2)] = 0;
-
-            text.compression = PNG_TEXT_COMPRESSION_zTXt;
-            text.key = (png_charp)buffer;
-            text.text = (png_charp)(buffer + keyword_length+2);
-            text.text_length = uncompressed_length;
-            text.itxt_length = 0;
-            text.lang = NULL;
-            text.lang_key = NULL;
-
-            if (png_set_text_2(png_ptr, info_ptr, &text, 1) != 0)
-               errmsg = "insufficient memory";
-         }
-      }
-
-      else
-         errmsg = png_ptr->zstream.msg;
-   }
-
-   if (errmsg != NULL)
-      png_chunk_benign_error(png_ptr, errmsg);
-}
-#endif
-
-#ifdef PNG_READ_iTXt_SUPPORTED
-/* Note: this does not correctly handle chunks that are > 64K under DOS */
-void /* PRIVATE */
-png_handle_iTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
-{
-   png_const_charp errmsg = NULL;
-   png_bytep buffer;
-   png_uint_32 prefix_length;
-
-   png_debug(1, "in png_handle_iTXt");
-
-#ifdef PNG_USER_LIMITS_SUPPORTED
-   if (png_ptr->user_chunk_cache_max != 0)
-   {
-      if (png_ptr->user_chunk_cache_max == 1)
-      {
-         png_crc_finish(png_ptr, length);
-         return;
-      }
-
-      if (--png_ptr->user_chunk_cache_max == 1)
-      {
-         png_crc_finish(png_ptr, length);
-         png_chunk_benign_error(png_ptr, "no space in chunk cache");
-         return;
-      }
-   }
-#endif
-
-   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
-      png_chunk_error(png_ptr, "missing IHDR");
-
-   if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
-      png_ptr->mode |= PNG_AFTER_IDAT;
-
-   buffer = png_read_buffer(png_ptr, length+1, 1/*warn*/);
-
-   if (buffer == NULL)
-   {
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "out of memory");
-      return;
-   }
-
-   png_crc_read(png_ptr, buffer, length);
-
-   if (png_crc_finish(png_ptr, 0) != 0)
-      return;
-
-   /* First the keyword. */
-   for (prefix_length=0;
-      prefix_length < length && buffer[prefix_length] != 0;
-      ++prefix_length)
-      /* Empty loop */ ;
-
-   /* Perform a basic check on the keyword length here. */
-   if (prefix_length > 79 || prefix_length < 1)
-      errmsg = "bad keyword";
-
-   /* Expect keyword, compression flag, compression type, language, translated
-    * keyword (both may be empty but are 0 terminated) then the text, which may
-    * be empty.
-    */
-   else if (prefix_length + 5 > length)
-      errmsg = "truncated";
-
-   else if (buffer[prefix_length+1] == 0 ||
-      (buffer[prefix_length+1] == 1 &&
-      buffer[prefix_length+2] == PNG_COMPRESSION_TYPE_BASE))
-   {
-      int compressed = buffer[prefix_length+1] != 0;
-      png_uint_32 language_offset, translated_keyword_offset;
-      png_alloc_size_t uncompressed_length = 0;
-
-      /* Now the language tag */
-      prefix_length += 3;
-      language_offset = prefix_length;
-
-      for (; prefix_length < length && buffer[prefix_length] != 0;
-         ++prefix_length)
-         /* Empty loop */ ;
-
-      /* WARNING: the length may be invalid here, this is checked below. */
-      translated_keyword_offset = ++prefix_length;
-
-      for (; prefix_length < length && buffer[prefix_length] != 0;
-         ++prefix_length)
-         /* Empty loop */ ;
-
-      /* prefix_length should now be at the trailing '\0' of the translated
-       * keyword, but it may already be over the end.  None of this arithmetic
-       * can overflow because chunks are at most 2^31 bytes long, but on 16-bit
-       * systems the available allocation may overflow.
-       */
-      ++prefix_length;
-
-      if (compressed == 0 && prefix_length <= length)
-         uncompressed_length = length - prefix_length;
-
-      else if (compressed != 0 && prefix_length < length)
-      {
-         uncompressed_length = PNG_SIZE_MAX;
-
-         /* TODO: at present png_decompress_chunk imposes a single application
-          * level memory limit, this should be split to different values for
-          * iCCP and text chunks.
-          */
-         if (png_decompress_chunk(png_ptr, length, prefix_length,
-             &uncompressed_length, 1/*terminate*/) == Z_STREAM_END)
-            buffer = png_ptr->read_buffer;
-
-         else
-            errmsg = png_ptr->zstream.msg;
-      }
-
-      else
-         errmsg = "truncated";
-
-      if (errmsg == NULL)
-      {
-         png_text text;
-
-         buffer[uncompressed_length+prefix_length] = 0;
-
-         if (compressed == 0)
-            text.compression = PNG_ITXT_COMPRESSION_NONE;
-
-         else
-            text.compression = PNG_ITXT_COMPRESSION_zTXt;
-
-         text.key = (png_charp)buffer;
-         text.lang = (png_charp)buffer + language_offset;
-         text.lang_key = (png_charp)buffer + translated_keyword_offset;
-         text.text = (png_charp)buffer + prefix_length;
-         text.text_length = 0;
-         text.itxt_length = uncompressed_length;
-
-         if (png_set_text_2(png_ptr, info_ptr, &text, 1) != 0)
-            errmsg = "insufficient memory";
-      }
-   }
-
-   else
-      errmsg = "bad compression info";
-
-   if (errmsg != NULL)
-      png_chunk_benign_error(png_ptr, errmsg);
-}
-#endif
-
-#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
-/* Utility function for png_handle_unknown; set up png_ptr::unknown_chunk */
-static int
-png_cache_unknown_chunk(png_structrp png_ptr, png_uint_32 length)
-{
-   png_alloc_size_t limit = PNG_SIZE_MAX;
-
-   if (png_ptr->unknown_chunk.data != NULL)
-   {
-      png_free(png_ptr, png_ptr->unknown_chunk.data);
-      png_ptr->unknown_chunk.data = NULL;
-   }
-
-#  ifdef PNG_SET_USER_LIMITS_SUPPORTED
-   if (png_ptr->user_chunk_malloc_max > 0 &&
-       png_ptr->user_chunk_malloc_max < limit)
-      limit = png_ptr->user_chunk_malloc_max;
-
-#  elif PNG_USER_CHUNK_MALLOC_MAX > 0
-   if (PNG_USER_CHUNK_MALLOC_MAX < limit)
-      limit = PNG_USER_CHUNK_MALLOC_MAX;
-#  endif
-
-   if (length <= limit)
-   {
-      PNG_CSTRING_FROM_CHUNK(png_ptr->unknown_chunk.name, png_ptr->chunk_name);
-      /* The following is safe because of the PNG_SIZE_MAX init above */
-      png_ptr->unknown_chunk.size = (png_size_t)length/*SAFE*/;
-      /* 'mode' is a flag array, only the bottom four bits matter here */
-      png_ptr->unknown_chunk.location = (png_byte)png_ptr->mode/*SAFE*/;
-
-      if (length == 0)
-         png_ptr->unknown_chunk.data = NULL;
-
-      else
-      {
-         /* Do a 'warn' here - it is handled below. */
-         png_ptr->unknown_chunk.data = png_voidcast(png_bytep,
-             png_malloc_warn(png_ptr, length));
-      }
-   }
-
-   if (png_ptr->unknown_chunk.data == NULL && length > 0)
-   {
-      /* This is benign because we clean up correctly */
-      png_crc_finish(png_ptr, length);
-      png_chunk_benign_error(png_ptr, "unknown chunk exceeds memory limits");
-      return 0;
-   }
-
-   else
-   {
-      if (length > 0)
-         png_crc_read(png_ptr, png_ptr->unknown_chunk.data, length);
-      png_crc_finish(png_ptr, 0);
-      return 1;
-   }
-}
-#endif /* READ_UNKNOWN_CHUNKS */
-
-/* Handle an unknown, or known but disabled, chunk */
-void /* PRIVATE */
-png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr,
-    png_uint_32 length, int keep)
-{
-   int handled = 0; /* the chunk was handled */
-
-   png_debug(1, "in png_handle_unknown");
-
-#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
-   /* NOTE: this code is based on the code in libpng-1.4.12 except for fixing
-    * the bug which meant that setting a non-default behavior for a specific
-    * chunk would be ignored (the default was always used unless a user
-    * callback was installed).
-    *
-    * 'keep' is the value from the png_chunk_unknown_handling, the setting for
-    * this specific chunk_name, if PNG_HANDLE_AS_UNKNOWN_SUPPORTED, if not it
-    * will always be PNG_HANDLE_CHUNK_AS_DEFAULT and it needs to be set here.
-    * This is just an optimization to avoid multiple calls to the lookup
-    * function.
-    */
-#  ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#     ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
-   keep = png_chunk_unknown_handling(png_ptr, png_ptr->chunk_name);
-#     endif
-#  endif
-
-   /* One of the following methods will read the chunk or skip it (at least one
-    * of these is always defined because this is the only way to switch on
-    * PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
-    */
-#  ifdef PNG_READ_USER_CHUNKS_SUPPORTED
-   /* The user callback takes precedence over the chunk keep value, but the
-    * keep value is still required to validate a save of a critical chunk.
-    */
-   if (png_ptr->read_user_chunk_fn != NULL)
-   {
-      if (png_cache_unknown_chunk(png_ptr, length) != 0)
-      {
-         /* Callback to user unknown chunk handler */
-         int ret = (*(png_ptr->read_user_chunk_fn))(png_ptr,
-             &png_ptr->unknown_chunk);
-
-         /* ret is:
-          * negative: An error occurred; png_chunk_error will be called.
-          *     zero: The chunk was not handled, the chunk will be discarded
-          *           unless png_set_keep_unknown_chunks has been used to set
-          *           a 'keep' behavior for this particular chunk, in which
-          *           case that will be used.  A critical chunk will cause an
-          *           error at this point unless it is to be saved.
-          * positive: The chunk was handled, libpng will ignore/discard it.
-          */
-         if (ret < 0)
-            png_chunk_error(png_ptr, "error in user chunk");
-
-         else if (ret == 0)
-         {
-            /* If the keep value is 'default' or 'never' override it, but
-             * still error out on critical chunks unless the keep value is
-             * 'always'  While this is weird it is the behavior in 1.4.12.
-             * A possible improvement would be to obey the value set for the
-             * chunk, but this would be an API change that would probably
-             * damage some applications.
-             *
-             * The png_app_warning below catches the case that matters, where
-             * the application has not set specific save or ignore for this
-             * chunk or global save or ignore.
-             */
-            if (keep < PNG_HANDLE_CHUNK_IF_SAFE)
-            {
-#              ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
-               if (png_ptr->unknown_default < PNG_HANDLE_CHUNK_IF_SAFE)
-               {
-                  png_chunk_warning(png_ptr, "Saving unknown chunk:");
-                  png_app_warning(png_ptr,
-                      "forcing save of an unhandled chunk;"
-                      " please call png_set_keep_unknown_chunks");
-                      /* with keep = PNG_HANDLE_CHUNK_IF_SAFE */
-               }
-#              endif
-               keep = PNG_HANDLE_CHUNK_IF_SAFE;
-            }
-         }
-
-         else /* chunk was handled */
-         {
-            handled = 1;
-            /* Critical chunks can be safely discarded at this point. */
-            keep = PNG_HANDLE_CHUNK_NEVER;
-         }
-      }
-
-      else
-         keep = PNG_HANDLE_CHUNK_NEVER; /* insufficient memory */
-   }
-
-   else
-   /* Use the SAVE_UNKNOWN_CHUNKS code or skip the chunk */
-#  endif /* READ_USER_CHUNKS */
-
-#  ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
-   {
-      /* keep is currently just the per-chunk setting, if there was no
-       * setting change it to the global default now (not that this may
-       * still be AS_DEFAULT) then obtain the cache of the chunk if required,
-       * if not simply skip the chunk.
-       */
-      if (keep == PNG_HANDLE_CHUNK_AS_DEFAULT)
-         keep = png_ptr->unknown_default;
-
-      if (keep == PNG_HANDLE_CHUNK_ALWAYS ||
-         (keep == PNG_HANDLE_CHUNK_IF_SAFE &&
-          PNG_CHUNK_ANCILLARY(png_ptr->chunk_name)))
-      {
-         if (png_cache_unknown_chunk(png_ptr, length) == 0)
-            keep = PNG_HANDLE_CHUNK_NEVER;
-      }
-
-      else
-         png_crc_finish(png_ptr, length);
-   }
-#  else
-#     ifndef PNG_READ_USER_CHUNKS_SUPPORTED
-#        error no method to support READ_UNKNOWN_CHUNKS
-#     endif
-
-   {
-      /* If here there is no read callback pointer set and no support is
-       * compiled in to just save the unknown chunks, so simply skip this
-       * chunk.  If 'keep' is something other than AS_DEFAULT or NEVER then
-       * the app has erroneously asked for unknown chunk saving when there
-       * is no support.
-       */
-      if (keep > PNG_HANDLE_CHUNK_NEVER)
-         png_app_error(png_ptr, "no unknown chunk support available");
-
-      png_crc_finish(png_ptr, length);
-   }
-#  endif
-
-#  ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
-   /* Now store the chunk in the chunk list if appropriate, and if the limits
-    * permit it.
-    */
-   if (keep == PNG_HANDLE_CHUNK_ALWAYS ||
-      (keep == PNG_HANDLE_CHUNK_IF_SAFE &&
-       PNG_CHUNK_ANCILLARY(png_ptr->chunk_name)))
-   {
-#     ifdef PNG_USER_LIMITS_SUPPORTED
-      switch (png_ptr->user_chunk_cache_max)
-      {
-         case 2:
-            png_ptr->user_chunk_cache_max = 1;
-            png_chunk_benign_error(png_ptr, "no space in chunk cache");
-            /* FALLTHROUGH */
-         case 1:
-            /* NOTE: prior to 1.6.0 this case resulted in an unknown critical
-             * chunk being skipped, now there will be a hard error below.
-             */
-            break;
-
-         default: /* not at limit */
-            --(png_ptr->user_chunk_cache_max);
-            /* FALLTHROUGH */
-         case 0: /* no limit */
-#  endif /* USER_LIMITS */
-            /* Here when the limit isn't reached or when limits are compiled
-             * out; store the chunk.
-             */
-            png_set_unknown_chunks(png_ptr, info_ptr,
-                &png_ptr->unknown_chunk, 1);
-            handled = 1;
-#  ifdef PNG_USER_LIMITS_SUPPORTED
-            break;
-      }
-#  endif
-   }
-#  else /* no store support: the chunk must be handled by the user callback */
-   PNG_UNUSED(info_ptr)
-#  endif
-
-   /* Regardless of the error handling below the cached data (if any) can be
-    * freed now.  Notice that the data is not freed if there is a png_error, but
-    * it will be freed by destroy_read_struct.
-    */
-   if (png_ptr->unknown_chunk.data != NULL)
-      png_free(png_ptr, png_ptr->unknown_chunk.data);
-   png_ptr->unknown_chunk.data = NULL;
-
-#else /* !PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */
-   /* There is no support to read an unknown chunk, so just skip it. */
-   png_crc_finish(png_ptr, length);
-   PNG_UNUSED(info_ptr)
-   PNG_UNUSED(keep)
-#endif /* !READ_UNKNOWN_CHUNKS */
-
-   /* Check for unhandled critical chunks */
-   if (handled == 0 && PNG_CHUNK_CRITICAL(png_ptr->chunk_name))
-      png_chunk_error(png_ptr, "unhandled critical chunk");
-}
-
-/* This function is called to verify that a chunk name is valid.
- * This function can't have the "critical chunk check" incorporated
- * into it, since in the future we will need to be able to call user
- * functions to handle unknown critical chunks after we check that
- * the chunk name itself is valid.
- */
-
-/* Bit hacking: the test for an invalid byte in the 4 byte chunk name is:
- *
- * ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
- */
-
-void /* PRIVATE */
-png_check_chunk_name(png_const_structrp png_ptr, const png_uint_32 chunk_name)
-{
-   int i;
-   png_uint_32 cn=chunk_name;
-
-   png_debug(1, "in png_check_chunk_name");
-
-   for (i=1; i<=4; ++i)
-   {
-      int c = cn & 0xff;
-
-      if (c < 65 || c > 122 || (c > 90 && c < 97))
-         png_chunk_error(png_ptr, "invalid chunk type");
-
-      cn >>= 8;
-   }
-}
-
-void /* PRIVATE */
-png_check_chunk_length(png_const_structrp png_ptr, const png_uint_32 length)
-{
-   png_alloc_size_t limit = PNG_UINT_31_MAX;
-
-# ifdef PNG_SET_USER_LIMITS_SUPPORTED
-   if (png_ptr->user_chunk_malloc_max > 0 &&
-       png_ptr->user_chunk_malloc_max < limit)
-      limit = png_ptr->user_chunk_malloc_max;
-# elif PNG_USER_CHUNK_MALLOC_MAX > 0
-   if (PNG_USER_CHUNK_MALLOC_MAX < limit)
-      limit = PNG_USER_CHUNK_MALLOC_MAX;
-# endif
-   if (png_ptr->chunk_name == png_IDAT)
-   {
-      png_alloc_size_t idat_limit = PNG_UINT_31_MAX;
-      size_t row_factor =
-         (png_ptr->width * png_ptr->channels * (png_ptr->bit_depth > 8? 2: 1)
-          + 1 + (png_ptr->interlaced? 6: 0));
-      if (png_ptr->height > PNG_UINT_32_MAX/row_factor)
-         idat_limit=PNG_UINT_31_MAX;
-      else
-         idat_limit = png_ptr->height * row_factor;
-      row_factor = row_factor > 32566? 32566 : row_factor;
-      idat_limit += 6 + 5*(idat_limit/row_factor+1); /* zlib+deflate overhead */
-      idat_limit=idat_limit < PNG_UINT_31_MAX? idat_limit : PNG_UINT_31_MAX;
-      limit = limit < idat_limit? idat_limit : limit;
-   }
-
-   if (length > limit)
-   {
-      png_debug2(0," length = %lu, limit = %lu",
-         (unsigned long)length,(unsigned long)limit);
-      png_chunk_error(png_ptr, "chunk data is too large");
-   }
-}
-
-/* Combines the row recently read in with the existing pixels in the row.  This
- * routine takes care of alpha and transparency if requested.  This routine also
- * handles the two methods of progressive display of interlaced images,
- * depending on the 'display' value; if 'display' is true then the whole row
- * (dp) is filled from the start by replicating the available pixels.  If
- * 'display' is false only those pixels present in the pass are filled in.
- */
-void /* PRIVATE */
-png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display)
-{
-   unsigned int pixel_depth = png_ptr->transformed_pixel_depth;
-   png_const_bytep sp = png_ptr->row_buf + 1;
-   png_alloc_size_t row_width = png_ptr->width;
-   unsigned int pass = png_ptr->pass;
-   png_bytep end_ptr = 0;
-   png_byte end_byte = 0;
-   unsigned int end_mask;
-
-   png_debug(1, "in png_combine_row");
-
-   /* Added in 1.5.6: it should not be possible to enter this routine until at
-    * least one row has been read from the PNG data and transformed.
-    */
-   if (pixel_depth == 0)
-      png_error(png_ptr, "internal row logic error");
-
-   /* Added in 1.5.4: the pixel depth should match the information returned by
-    * any call to png_read_update_info at this point.  Do not continue if we got
-    * this wrong.
-    */
-   if (png_ptr->info_rowbytes != 0 && png_ptr->info_rowbytes !=
-          PNG_ROWBYTES(pixel_depth, row_width))
-      png_error(png_ptr, "internal row size calculation error");
-
-   /* Don't expect this to ever happen: */
-   if (row_width == 0)
-      png_error(png_ptr, "internal row width error");
-
-   /* Preserve the last byte in cases where only part of it will be overwritten,
-    * the multiply below may overflow, we don't care because ANSI-C guarantees
-    * we get the low bits.
-    */
-   end_mask = (pixel_depth * row_width) & 7;
-   if (end_mask != 0)
-   {
-      /* end_ptr == NULL is a flag to say do nothing */
-      end_ptr = dp + PNG_ROWBYTES(pixel_depth, row_width) - 1;
-      end_byte = *end_ptr;
-#     ifdef PNG_READ_PACKSWAP_SUPPORTED
-      if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
-         /* little-endian byte */
-         end_mask = (unsigned int)(0xff << end_mask);
-
-      else /* big-endian byte */
-#     endif
-      end_mask = 0xff >> end_mask;
-      /* end_mask is now the bits to *keep* from the destination row */
-   }
-
-   /* For non-interlaced images this reduces to a memcpy(). A memcpy()
-    * will also happen if interlacing isn't supported or if the application
-    * does not call png_set_interlace_handling().  In the latter cases the
-    * caller just gets a sequence of the unexpanded rows from each interlace
-    * pass.
-    */
-#ifdef PNG_READ_INTERLACING_SUPPORTED
-   if (png_ptr->interlaced != 0 &&
-       (png_ptr->transformations & PNG_INTERLACE) != 0 &&
-       pass < 6 && (display == 0 ||
-       /* The following copies everything for 'display' on passes 0, 2 and 4. */
-       (display == 1 && (pass & 1) != 0)))
-   {
-      /* Narrow images may have no bits in a pass; the caller should handle
-       * this, but this test is cheap:
-       */
-      if (row_width <= PNG_PASS_START_COL(pass))
-         return;
-
-      if (pixel_depth < 8)
-      {
-         /* For pixel depths up to 4 bpp the 8-pixel mask can be expanded to fit
-          * into 32 bits, then a single loop over the bytes using the four byte
-          * values in the 32-bit mask can be used.  For the 'display' option the
-          * expanded mask may also not require any masking within a byte.  To
-          * make this work the PACKSWAP option must be taken into account - it
-          * simply requires the pixels to be reversed in each byte.
-          *
-          * The 'regular' case requires a mask for each of the first 6 passes,
-          * the 'display' case does a copy for the even passes in the range
-          * 0..6.  This has already been handled in the test above.
-          *
-          * The masks are arranged as four bytes with the first byte to use in
-          * the lowest bits (little-endian) regardless of the order (PACKSWAP or
-          * not) of the pixels in each byte.
-          *
-          * NOTE: the whole of this logic depends on the caller of this function
-          * only calling it on rows appropriate to the pass.  This function only
-          * understands the 'x' logic; the 'y' logic is handled by the caller.
-          *
-          * The following defines allow generation of compile time constant bit
-          * masks for each pixel depth and each possibility of swapped or not
-          * swapped bytes.  Pass 'p' is in the range 0..6; 'x', a pixel index,
-          * is in the range 0..7; and the result is 1 if the pixel is to be
-          * copied in the pass, 0 if not.  'S' is for the sparkle method, 'B'
-          * for the block method.
-          *
-          * With some compilers a compile time expression of the general form:
-          *
-          *    (shift >= 32) ? (a >> (shift-32)) : (b >> shift)
-          *
-          * Produces warnings with values of 'shift' in the range 33 to 63
-          * because the right hand side of the ?: expression is evaluated by
-          * the compiler even though it isn't used.  Microsoft Visual C (various
-          * versions) and the Intel C compiler are known to do this.  To avoid
-          * this the following macros are used in 1.5.6.  This is a temporary
-          * solution to avoid destabilizing the code during the release process.
-          */
-#        if PNG_USE_COMPILE_TIME_MASKS
-#           define PNG_LSR(x,s) ((x)>>((s) & 0x1f))
-#           define PNG_LSL(x,s) ((x)<<((s) & 0x1f))
-#        else
-#           define PNG_LSR(x,s) ((x)>>(s))
-#           define PNG_LSL(x,s) ((x)<<(s))
-#        endif
-#        define S_COPY(p,x) (((p)<4 ? PNG_LSR(0x80088822,(3-(p))*8+(7-(x))) :\
-           PNG_LSR(0xaa55ff00,(7-(p))*8+(7-(x)))) & 1)
-#        define B_COPY(p,x) (((p)<4 ? PNG_LSR(0xff0fff33,(3-(p))*8+(7-(x))) :\
-           PNG_LSR(0xff55ff00,(7-(p))*8+(7-(x)))) & 1)
-
-         /* Return a mask for pass 'p' pixel 'x' at depth 'd'.  The mask is
-          * little endian - the first pixel is at bit 0 - however the extra
-          * parameter 's' can be set to cause the mask position to be swapped
-          * within each byte, to match the PNG format.  This is done by XOR of
-          * the shift with 7, 6 or 4 for bit depths 1, 2 and 4.
-          */
-#        define PIXEL_MASK(p,x,d,s) \
-            (PNG_LSL(((PNG_LSL(1U,(d)))-1),(((x)*(d))^((s)?8-(d):0))))
-
-         /* Hence generate the appropriate 'block' or 'sparkle' pixel copy mask.
-          */
-#        define S_MASKx(p,x,d,s) (S_COPY(p,x)?PIXEL_MASK(p,x,d,s):0)
-#        define B_MASKx(p,x,d,s) (B_COPY(p,x)?PIXEL_MASK(p,x,d,s):0)
-
-         /* Combine 8 of these to get the full mask.  For the 1-bpp and 2-bpp
-          * cases the result needs replicating, for the 4-bpp case the above
-          * generates a full 32 bits.
-          */
-#        define MASK_EXPAND(m,d) ((m)*((d)==1?0x01010101:((d)==2?0x00010001:1)))
-
-#        define S_MASK(p,d,s) MASK_EXPAND(S_MASKx(p,0,d,s) + S_MASKx(p,1,d,s) +\
-            S_MASKx(p,2,d,s) + S_MASKx(p,3,d,s) + S_MASKx(p,4,d,s) +\
-            S_MASKx(p,5,d,s) + S_MASKx(p,6,d,s) + S_MASKx(p,7,d,s), d)
-
-#        define B_MASK(p,d,s) MASK_EXPAND(B_MASKx(p,0,d,s) + B_MASKx(p,1,d,s) +\
-            B_MASKx(p,2,d,s) + B_MASKx(p,3,d,s) + B_MASKx(p,4,d,s) +\
-            B_MASKx(p,5,d,s) + B_MASKx(p,6,d,s) + B_MASKx(p,7,d,s), d)
-
-#if PNG_USE_COMPILE_TIME_MASKS
-         /* Utility macros to construct all the masks for a depth/swap
-          * combination.  The 's' parameter says whether the format is PNG
-          * (big endian bytes) or not.  Only the three odd-numbered passes are
-          * required for the display/block algorithm.
-          */
-#        define S_MASKS(d,s) { S_MASK(0,d,s), S_MASK(1,d,s), S_MASK(2,d,s),\
-            S_MASK(3,d,s), S_MASK(4,d,s), S_MASK(5,d,s) }
-
-#        define B_MASKS(d,s) { B_MASK(1,d,s), B_MASK(3,d,s), B_MASK(5,d,s) }
-
-#        define DEPTH_INDEX(d) ((d)==1?0:((d)==2?1:2))
-
-         /* Hence the pre-compiled masks indexed by PACKSWAP (or not), depth and
-          * then pass:
-          */
-         static PNG_CONST png_uint_32 row_mask[2/*PACKSWAP*/][3/*depth*/][6] =
-         {
-            /* Little-endian byte masks for PACKSWAP */
-            { S_MASKS(1,0), S_MASKS(2,0), S_MASKS(4,0) },
-            /* Normal (big-endian byte) masks - PNG format */
-            { S_MASKS(1,1), S_MASKS(2,1), S_MASKS(4,1) }
-         };
-
-         /* display_mask has only three entries for the odd passes, so index by
-          * pass>>1.
-          */
-         static PNG_CONST png_uint_32 display_mask[2][3][3] =
-         {
-            /* Little-endian byte masks for PACKSWAP */
-            { B_MASKS(1,0), B_MASKS(2,0), B_MASKS(4,0) },
-            /* Normal (big-endian byte) masks - PNG format */
-            { B_MASKS(1,1), B_MASKS(2,1), B_MASKS(4,1) }
-         };
-
-#        define MASK(pass,depth,display,png)\
-            ((display)?display_mask[png][DEPTH_INDEX(depth)][pass>>1]:\
-               row_mask[png][DEPTH_INDEX(depth)][pass])
-
-#else /* !PNG_USE_COMPILE_TIME_MASKS */
-         /* This is the runtime alternative: it seems unlikely that this will
-          * ever be either smaller or faster than the compile time approach.
-          */
-#        define MASK(pass,depth,display,png)\
-            ((display)?B_MASK(pass,depth,png):S_MASK(pass,depth,png))
-#endif /* !USE_COMPILE_TIME_MASKS */
-
-         /* Use the appropriate mask to copy the required bits.  In some cases
-          * the byte mask will be 0 or 0xff; optimize these cases.  row_width is
-          * the number of pixels, but the code copies bytes, so it is necessary
-          * to special case the end.
-          */
-         png_uint_32 pixels_per_byte = 8 / pixel_depth;
-         png_uint_32 mask;
-
-#        ifdef PNG_READ_PACKSWAP_SUPPORTED
-         if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
-            mask = MASK(pass, pixel_depth, display, 0);
-
-         else
-#        endif
-         mask = MASK(pass, pixel_depth, display, 1);
-
-         for (;;)
-         {
-            png_uint_32 m;
-
-            /* It doesn't matter in the following if png_uint_32 has more than
-             * 32 bits because the high bits always match those in m<<24; it is,
-             * however, essential to use OR here, not +, because of this.
-             */
-            m = mask;
-            mask = (m >> 8) | (m << 24); /* rotate right to good compilers */
-            m &= 0xff;
-
-            if (m != 0) /* something to copy */
-            {
-               if (m != 0xff)
-                  *dp = (png_byte)((*dp & ~m) | (*sp & m));
-               else
-                  *dp = *sp;
-            }
-
-            /* NOTE: this may overwrite the last byte with garbage if the image
-             * is not an exact number of bytes wide; libpng has always done
-             * this.
-             */
-            if (row_width <= pixels_per_byte)
-               break; /* May need to restore part of the last byte */
-
-            row_width -= pixels_per_byte;
-            ++dp;
-            ++sp;
-         }
-      }
-
-      else /* pixel_depth >= 8 */
-      {
-         unsigned int bytes_to_copy, bytes_to_jump;
-
-         /* Validate the depth - it must be a multiple of 8 */
-         if (pixel_depth & 7)
-            png_error(png_ptr, "invalid user transform pixel depth");
-
-         pixel_depth >>= 3; /* now in bytes */
-         row_width *= pixel_depth;
-
-         /* Regardless of pass number the Adam 7 interlace always results in a
-          * fixed number of pixels to copy then to skip.  There may be a
-          * different number of pixels to skip at the start though.
-          */
-         {
-            unsigned int offset = PNG_PASS_START_COL(pass) * pixel_depth;
-
-            row_width -= offset;
-            dp += offset;
-            sp += offset;
-         }
-
-         /* Work out the bytes to copy. */
-         if (display != 0)
-         {
-            /* When doing the 'block' algorithm the pixel in the pass gets
-             * replicated to adjacent pixels.  This is why the even (0,2,4,6)
-             * passes are skipped above - the entire expanded row is copied.
-             */
-            bytes_to_copy = (1<<((6-pass)>>1)) * pixel_depth;
-
-            /* But don't allow this number to exceed the actual row width. */
-            if (bytes_to_copy > row_width)
-               bytes_to_copy = (unsigned int)/*SAFE*/row_width;
-         }
-
-         else /* normal row; Adam7 only ever gives us one pixel to copy. */
-            bytes_to_copy = pixel_depth;
-
-         /* In Adam7 there is a constant offset between where the pixels go. */
-         bytes_to_jump = PNG_PASS_COL_OFFSET(pass) * pixel_depth;
-
-         /* And simply copy these bytes.  Some optimization is possible here,
-          * depending on the value of 'bytes_to_copy'.  Special case the low
-          * byte counts, which we know to be frequent.
-          *
-          * Notice that these cases all 'return' rather than 'break' - this
-          * avoids an unnecessary test on whether to restore the last byte
-          * below.
-          */
-         switch (bytes_to_copy)
-         {
-            case 1:
-               for (;;)
-               {
-                  *dp = *sp;
-
-                  if (row_width <= bytes_to_jump)
-                     return;
-
-                  dp += bytes_to_jump;
-                  sp += bytes_to_jump;
-                  row_width -= bytes_to_jump;
-               }
-
-            case 2:
-               /* There is a possibility of a partial copy at the end here; this
-                * slows the code down somewhat.
-                */
-               do
-               {
-                  dp[0] = sp[0]; dp[1] = sp[1];
-
-                  if (row_width <= bytes_to_jump)
-                     return;
-
-                  sp += bytes_to_jump;
-                  dp += bytes_to_jump;
-                  row_width -= bytes_to_jump;
-               }
-               while (row_width > 1);
-
-               /* And there can only be one byte left at this point: */
-               *dp = *sp;
-               return;
-
-            case 3:
-               /* This can only be the RGB case, so each copy is exactly one
-                * pixel and it is not necessary to check for a partial copy.
-                */
-               for (;;)
-               {
-                  dp[0] = sp[0]; dp[1] = sp[1]; dp[2] = sp[2];
-
-                  if (row_width <= bytes_to_jump)
-                     return;
-
-                  sp += bytes_to_jump;
-                  dp += bytes_to_jump;
-                  row_width -= bytes_to_jump;
-               }
-
-            default:
-#if PNG_ALIGN_TYPE != PNG_ALIGN_NONE
-               /* Check for double byte alignment and, if possible, use a
-                * 16-bit copy.  Don't attempt this for narrow images - ones that
-                * are less than an interlace panel wide.  Don't attempt it for
-                * wide bytes_to_copy either - use the memcpy there.
-                */
-               if (bytes_to_copy < 16 /*else use memcpy*/ &&
-                   png_isaligned(dp, png_uint_16) &&
-                   png_isaligned(sp, png_uint_16) &&
-                   bytes_to_copy % (sizeof (png_uint_16)) == 0 &&
-                   bytes_to_jump % (sizeof (png_uint_16)) == 0)
-               {
-                  /* Everything is aligned for png_uint_16 copies, but try for
-                   * png_uint_32 first.
-                   */
-                  if (png_isaligned(dp, png_uint_32) &&
-                      png_isaligned(sp, png_uint_32) &&
-                      bytes_to_copy % (sizeof (png_uint_32)) == 0 &&
-                      bytes_to_jump % (sizeof (png_uint_32)) == 0)
-                  {
-                     png_uint_32p dp32 = png_aligncast(png_uint_32p,dp);
-                     png_const_uint_32p sp32 = png_aligncastconst(
-                         png_const_uint_32p, sp);
-                     size_t skip = (bytes_to_jump-bytes_to_copy) /
-                         (sizeof (png_uint_32));
-
-                     do
-                     {
-                        size_t c = bytes_to_copy;
-                        do
-                        {
-                           *dp32++ = *sp32++;
-                           c -= (sizeof (png_uint_32));
-                        }
-                        while (c > 0);
-
-                        if (row_width <= bytes_to_jump)
-                           return;
-
-                        dp32 += skip;
-                        sp32 += skip;
-                        row_width -= bytes_to_jump;
-                     }
-                     while (bytes_to_copy <= row_width);
-
-                     /* Get to here when the row_width truncates the final copy.
-                      * There will be 1-3 bytes left to copy, so don't try the
-                      * 16-bit loop below.
-                      */
-                     dp = (png_bytep)dp32;
-                     sp = (png_const_bytep)sp32;
-                     do
-                        *dp++ = *sp++;
-                     while (--row_width > 0);
-                     return;
-                  }
-
-                  /* Else do it in 16-bit quantities, but only if the size is
-                   * not too large.
-                   */
-                  else
-                  {
-                     png_uint_16p dp16 = png_aligncast(png_uint_16p, dp);
-                     png_const_uint_16p sp16 = png_aligncastconst(
-                        png_const_uint_16p, sp);
-                     size_t skip = (bytes_to_jump-bytes_to_copy) /
-                        (sizeof (png_uint_16));
-
-                     do
-                     {
-                        size_t c = bytes_to_copy;
-                        do
-                        {
-                           *dp16++ = *sp16++;
-                           c -= (sizeof (png_uint_16));
-                        }
-                        while (c > 0);
-
-                        if (row_width <= bytes_to_jump)
-                           return;
-
-                        dp16 += skip;
-                        sp16 += skip;
-                        row_width -= bytes_to_jump;
-                     }
-                     while (bytes_to_copy <= row_width);
-
-                     /* End of row - 1 byte left, bytes_to_copy > row_width: */
-                     dp = (png_bytep)dp16;
-                     sp = (png_const_bytep)sp16;
-                     do
-                        *dp++ = *sp++;
-                     while (--row_width > 0);
-                     return;
-                  }
-               }
-#endif /* ALIGN_TYPE code */
-
-               /* The true default - use a memcpy: */
-               for (;;)
-               {
-                  memcpy(dp, sp, bytes_to_copy);
-
-                  if (row_width <= bytes_to_jump)
-                     return;
-
-                  sp += bytes_to_jump;
-                  dp += bytes_to_jump;
-                  row_width -= bytes_to_jump;
-                  if (bytes_to_copy > row_width)
-                     bytes_to_copy = (unsigned int)/*SAFE*/row_width;
-               }
-         }
-
-         /* NOT REACHED*/
-      } /* pixel_depth >= 8 */
-
-      /* Here if pixel_depth < 8 to check 'end_ptr' below. */
-   }
-   else
-#endif /* READ_INTERLACING */
-
-   /* If here then the switch above wasn't used so just memcpy the whole row
-    * from the temporary row buffer (notice that this overwrites the end of the
-    * destination row if it is a partial byte.)
-    */
-   memcpy(dp, sp, PNG_ROWBYTES(pixel_depth, row_width));
-
-   /* Restore the overwritten bits from the last byte if necessary. */
-   if (end_ptr != NULL)
-      *end_ptr = (png_byte)((end_byte & end_mask) | (*end_ptr & ~end_mask));
-}
-
-#ifdef PNG_READ_INTERLACING_SUPPORTED
-void /* PRIVATE */
-png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
-    png_uint_32 transformations /* Because these may affect the byte layout */)
-{
-   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
-   /* Offset to next interlace block */
-   static PNG_CONST unsigned int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
-
-   png_debug(1, "in png_do_read_interlace");
-   if (row != NULL && row_info != NULL)
-   {
-      png_uint_32 final_width;
-
-      final_width = row_info->width * png_pass_inc[pass];
-
-      switch (row_info->pixel_depth)
-      {
-         case 1:
-         {
-            png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 3);
-            png_bytep dp = row + (png_size_t)((final_width - 1) >> 3);
-            unsigned int sshift, dshift;
-            unsigned int s_start, s_end;
-            int s_inc;
-            int jstop = (int)png_pass_inc[pass];
-            png_byte v;
-            png_uint_32 i;
-            int j;
-
-#ifdef PNG_READ_PACKSWAP_SUPPORTED
-            if ((transformations & PNG_PACKSWAP) != 0)
-            {
-                sshift = ((row_info->width + 7) & 0x07);
-                dshift = ((final_width + 7) & 0x07);
-                s_start = 7;
-                s_end = 0;
-                s_inc = -1;
-            }
-
-            else
-#endif
-            {
-                sshift = 7 - ((row_info->width + 7) & 0x07);
-                dshift = 7 - ((final_width + 7) & 0x07);
-                s_start = 0;
-                s_end = 7;
-                s_inc = 1;
-            }
-
-            for (i = 0; i < row_info->width; i++)
-            {
-               v = (png_byte)((*sp >> sshift) & 0x01);
-               for (j = 0; j < jstop; j++)
-               {
-                  unsigned int tmp = *dp & (0x7f7f >> (7 - dshift));
-                  tmp |= (unsigned int)(v << dshift);
-                  *dp = (png_byte)(tmp & 0xff);
-
-                  if (dshift == s_end)
-                  {
-                     dshift = s_start;
-                     dp--;
-                  }
-
-                  else
-                     dshift = (unsigned int)((int)dshift + s_inc);
-               }
-
-               if (sshift == s_end)
-               {
-                  sshift = s_start;
-                  sp--;
-               }
-
-               else
-                  sshift = (unsigned int)((int)sshift + s_inc);
-            }
-            break;
-         }
-
-         case 2:
-         {
-            png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2);
-            png_bytep dp = row + (png_uint_32)((final_width - 1) >> 2);
-            unsigned int sshift, dshift;
-            unsigned int s_start, s_end;
-            int s_inc;
-            int jstop = (int)png_pass_inc[pass];
-            png_uint_32 i;
-
-#ifdef PNG_READ_PACKSWAP_SUPPORTED
-            if ((transformations & PNG_PACKSWAP) != 0)
-            {
-               sshift = (((row_info->width + 3) & 0x03) << 1);
-               dshift = (((final_width + 3) & 0x03) << 1);
-               s_start = 6;
-               s_end = 0;
-               s_inc = -2;
-            }
-
-            else
-#endif
-            {
-               sshift = ((3 - ((row_info->width + 3) & 0x03)) << 1);
-               dshift = ((3 - ((final_width + 3) & 0x03)) << 1);
-               s_start = 0;
-               s_end = 6;
-               s_inc = 2;
-            }
-
-            for (i = 0; i < row_info->width; i++)
-            {
-               png_byte v;
-               int j;
-
-               v = (png_byte)((*sp >> sshift) & 0x03);
-               for (j = 0; j < jstop; j++)
-               {
-                  unsigned int tmp = *dp & (0x3f3f >> (6 - dshift));
-                  tmp |= (unsigned int)(v << dshift);
-                  *dp = (png_byte)(tmp & 0xff);
-
-                  if (dshift == s_end)
-                  {
-                     dshift = s_start;
-                     dp--;
-                  }
-
-                  else
-                     dshift = (unsigned int)((int)dshift + s_inc);
-               }
-
-               if (sshift == s_end)
-               {
-                  sshift = s_start;
-                  sp--;
-               }
-
-               else
-                  sshift = (unsigned int)((int)sshift + s_inc);
-            }
-            break;
-         }
-
-         case 4:
-         {
-            png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1);
-            png_bytep dp = row + (png_size_t)((final_width - 1) >> 1);
-            unsigned int sshift, dshift;
-            unsigned int s_start, s_end;
-            int s_inc;
-            png_uint_32 i;
-            int jstop = (int)png_pass_inc[pass];
-
-#ifdef PNG_READ_PACKSWAP_SUPPORTED
-            if ((transformations & PNG_PACKSWAP) != 0)
-            {
-               sshift = (((row_info->width + 1) & 0x01) << 2);
-               dshift = (((final_width + 1) & 0x01) << 2);
-               s_start = 4;
-               s_end = 0;
-               s_inc = -4;
-            }
-
-            else
-#endif
-            {
-               sshift = ((1 - ((row_info->width + 1) & 0x01)) << 2);
-               dshift = ((1 - ((final_width + 1) & 0x01)) << 2);
-               s_start = 0;
-               s_end = 4;
-               s_inc = 4;
-            }
-
-            for (i = 0; i < row_info->width; i++)
-            {
-               png_byte v = (png_byte)((*sp >> sshift) & 0x0f);
-               int j;
-
-               for (j = 0; j < jstop; j++)
-               {
-                  unsigned int tmp = *dp & (0xf0f >> (4 - dshift));
-                  tmp |= (unsigned int)(v << dshift);
-                  *dp = (png_byte)(tmp & 0xff);
-
-                  if (dshift == s_end)
-                  {
-                     dshift = s_start;
-                     dp--;
-                  }
-
-                  else
-                     dshift = (unsigned int)((int)dshift + s_inc);
-               }
-
-               if (sshift == s_end)
-               {
-                  sshift = s_start;
-                  sp--;
-               }
-
-               else
-                  sshift = (unsigned int)((int)sshift + s_inc);
-            }
-            break;
-         }
-
-         default:
-         {
-            png_size_t pixel_bytes = (row_info->pixel_depth >> 3);
-
-            png_bytep sp = row + (png_size_t)(row_info->width - 1)
-                * pixel_bytes;
-
-            png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
-
-            int jstop = (int)png_pass_inc[pass];
-            png_uint_32 i;
-
-            for (i = 0; i < row_info->width; i++)
-            {
-               png_byte v[8]; /* SAFE; pixel_depth does not exceed 64 */
-               int j;
-
-               memcpy(v, sp, pixel_bytes);
-
-               for (j = 0; j < jstop; j++)
-               {
-                  memcpy(dp, v, pixel_bytes);
-                  dp -= pixel_bytes;
-               }
-
-               sp -= pixel_bytes;
-            }
-            break;
-         }
-      }
-
-      row_info->width = final_width;
-      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width);
-   }
-#ifndef PNG_READ_PACKSWAP_SUPPORTED
-   PNG_UNUSED(transformations)  /* Silence compiler warning */
-#endif
-}
-#endif /* READ_INTERLACING */
-
-static void
-png_read_filter_row_sub(png_row_infop row_info, png_bytep row,
-    png_const_bytep prev_row)
-{
-   png_size_t i;
-   png_size_t istop = row_info->rowbytes;
-   unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
-   png_bytep rp = row + bpp;
-
-   PNG_UNUSED(prev_row)
-
-   for (i = bpp; i < istop; i++)
-   {
-      *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
-      rp++;
-   }
-}
-
-static void
-png_read_filter_row_up(png_row_infop row_info, png_bytep row,
-    png_const_bytep prev_row)
-{
-   png_size_t i;
-   png_size_t istop = row_info->rowbytes;
-   png_bytep rp = row;
-   png_const_bytep pp = prev_row;
-
-   for (i = 0; i < istop; i++)
-   {
-      *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
-      rp++;
-   }
-}
-
-static void
-png_read_filter_row_avg(png_row_infop row_info, png_bytep row,
-    png_const_bytep prev_row)
-{
-   png_size_t i;
-   png_bytep rp = row;
-   png_const_bytep pp = prev_row;
-   unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
-   png_size_t istop = row_info->rowbytes - bpp;
-
-   for (i = 0; i < bpp; i++)
-   {
-      *rp = (png_byte)(((int)(*rp) +
-         ((int)(*pp++) / 2 )) & 0xff);
-
-      rp++;
-   }
-
-   for (i = 0; i < istop; i++)
-   {
-      *rp = (png_byte)(((int)(*rp) +
-         (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
-
-      rp++;
-   }
-}
-
-static void
-png_read_filter_row_paeth_1byte_pixel(png_row_infop row_info, png_bytep row,
-    png_const_bytep prev_row)
-{
-   png_bytep rp_end = row + row_info->rowbytes;
-   int a, c;
-
-   /* First pixel/byte */
-   c = *prev_row++;
-   a = *row + c;
-   *row++ = (png_byte)a;
-
-   /* Remainder */
-   while (row < rp_end)
-   {
-      int b, pa, pb, pc, p;
-
-      a &= 0xff; /* From previous iteration or start */
-      b = *prev_row++;
-
-      p = b - c;
-      pc = a - c;
-
-#ifdef PNG_USE_ABS
-      pa = abs(p);
-      pb = abs(pc);
-      pc = abs(p + pc);
-#else
-      pa = p < 0 ? -p : p;
-      pb = pc < 0 ? -pc : pc;
-      pc = (p + pc) < 0 ? -(p + pc) : p + pc;
-#endif
-
-      /* Find the best predictor, the least of pa, pb, pc favoring the earlier
-       * ones in the case of a tie.
-       */
-      if (pb < pa)
-      {
-         pa = pb; a = b;
-      }
-      if (pc < pa) a = c;
-
-      /* Calculate the current pixel in a, and move the previous row pixel to c
-       * for the next time round the loop
-       */
-      c = b;
-      a += *row;
-      *row++ = (png_byte)a;
-   }
-}
-
-static void
-png_read_filter_row_paeth_multibyte_pixel(png_row_infop row_info, png_bytep row,
-    png_const_bytep prev_row)
-{
-   unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
-   png_bytep rp_end = row + bpp;
-
-   /* Process the first pixel in the row completely (this is the same as 'up'
-    * because there is only one candidate predictor for the first row).
-    */
-   while (row < rp_end)
-   {
-      int a = *row + *prev_row++;
-      *row++ = (png_byte)a;
-   }
-
-   /* Remainder */
-   rp_end = rp_end + (row_info->rowbytes - bpp);
-
-   while (row < rp_end)
-   {
-      int a, b, c, pa, pb, pc, p;
-
-      c = *(prev_row - bpp);
-      a = *(row - bpp);
-      b = *prev_row++;
-
-      p = b - c;
-      pc = a - c;
-
-#ifdef PNG_USE_ABS
-      pa = abs(p);
-      pb = abs(pc);
-      pc = abs(p + pc);
-#else
-      pa = p < 0 ? -p : p;
-      pb = pc < 0 ? -pc : pc;
-      pc = (p + pc) < 0 ? -(p + pc) : p + pc;
-#endif
-
-      if (pb < pa)
-      {
-         pa = pb; a = b;
-      }
-      if (pc < pa) a = c;
-
-      a += *row;
-      *row++ = (png_byte)a;
-   }
-}
-
-static void
-png_init_filter_functions(png_structrp pp)
-   /* This function is called once for every PNG image (except for PNG images
-    * that only use PNG_FILTER_VALUE_NONE for all rows) to set the
-    * implementations required to reverse the filtering of PNG rows.  Reversing
-    * the filter is the first transformation performed on the row data.  It is
-    * performed in place, therefore an implementation can be selected based on
-    * the image pixel format.  If the implementation depends on image width then
-    * take care to ensure that it works correctly if the image is interlaced -
-    * interlacing causes the actual row width to vary.
-    */
-{
-   unsigned int bpp = (pp->pixel_depth + 7) >> 3;
-
-   pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub;
-   pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up;
-   pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg;
-   if (bpp == 1)
-      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
-         png_read_filter_row_paeth_1byte_pixel;
-   else
-      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
-         png_read_filter_row_paeth_multibyte_pixel;
-
-#ifdef PNG_FILTER_OPTIMIZATIONS
-   /* To use this define PNG_FILTER_OPTIMIZATIONS as the name of a function to
-    * call to install hardware optimizations for the above functions; simply
-    * replace whatever elements of the pp->read_filter[] array with a hardware
-    * specific (or, for that matter, generic) optimization.
-    *
-    * To see an example of this examine what configure.ac does when
-    * --enable-arm-neon is specified on the command line.
-    */
-   PNG_FILTER_OPTIMIZATIONS(pp, bpp);
-#endif
-}
-
-void /* PRIVATE */
-png_read_filter_row(png_structrp pp, png_row_infop row_info, png_bytep row,
-    png_const_bytep prev_row, int filter)
-{
-   /* OPTIMIZATION: DO NOT MODIFY THIS FUNCTION, instead #define
-    * PNG_FILTER_OPTIMIZATIONS to a function that overrides the generic
-    * implementations.  See png_init_filter_functions above.
-    */
-   if (filter > PNG_FILTER_VALUE_NONE && filter < PNG_FILTER_VALUE_LAST)
-   {
-      if (pp->read_filter[0] == NULL)
-         png_init_filter_functions(pp);
-
-      pp->read_filter[filter-1](row_info, row, prev_row);
-   }
-}
-
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-void /* PRIVATE */
-png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
-    png_alloc_size_t avail_out)
-{
-   /* Loop reading IDATs and decompressing the result into output[avail_out] */
-   png_ptr->zstream.next_out = output;
-   png_ptr->zstream.avail_out = 0; /* safety: set below */
-
-   if (output == NULL)
-      avail_out = 0;
-
-   do
-   {
-      int ret;
-      png_byte tmpbuf[PNG_INFLATE_BUF_SIZE];
-
-      if (png_ptr->zstream.avail_in == 0)
-      {
-         uInt avail_in;
-         png_bytep buffer;
-
-         while (png_ptr->idat_size == 0)
-         {
-            png_crc_finish(png_ptr, 0);
-
-            png_ptr->idat_size = png_read_chunk_header(png_ptr);
-            /* This is an error even in the 'check' case because the code just
-             * consumed a non-IDAT header.
-             */
-            if (png_ptr->chunk_name != png_IDAT)
-               png_error(png_ptr, "Not enough image data");
-         }
-
-         avail_in = png_ptr->IDAT_read_size;
-
-         if (avail_in > png_ptr->idat_size)
-            avail_in = (uInt)png_ptr->idat_size;
-
-         /* A PNG with a gradually increasing IDAT size will defeat this attempt
-          * to minimize memory usage by causing lots of re-allocs, but
-          * realistically doing IDAT_read_size re-allocs is not likely to be a
-          * big problem.
-          */
-         buffer = png_read_buffer(png_ptr, avail_in, 0/*error*/);
-
-         png_crc_read(png_ptr, buffer, avail_in);
-         png_ptr->idat_size -= avail_in;
-
-         png_ptr->zstream.next_in = buffer;
-         png_ptr->zstream.avail_in = avail_in;
-      }
-
-      /* And set up the output side. */
-      if (output != NULL) /* standard read */
-      {
-         uInt out = ZLIB_IO_MAX;
-
-         if (out > avail_out)
-            out = (uInt)avail_out;
-
-         avail_out -= out;
-         png_ptr->zstream.avail_out = out;
-      }
-
-      else /* after last row, checking for end */
-      {
-         png_ptr->zstream.next_out = tmpbuf;
-         png_ptr->zstream.avail_out = (sizeof tmpbuf);
-      }
-
-      /* Use NO_FLUSH; this gives zlib the maximum opportunity to optimize the
-       * process.  If the LZ stream is truncated the sequential reader will
-       * terminally damage the stream, above, by reading the chunk header of the
-       * following chunk (it then exits with png_error).
-       *
-       * TODO: deal more elegantly with truncated IDAT lists.
-       */
-      ret = PNG_INFLATE(png_ptr, Z_NO_FLUSH);
-
-      /* Take the unconsumed output back. */
-      if (output != NULL)
-         avail_out += png_ptr->zstream.avail_out;
-
-      else /* avail_out counts the extra bytes */
-         avail_out += (sizeof tmpbuf) - png_ptr->zstream.avail_out;
-
-      png_ptr->zstream.avail_out = 0;
-
-      if (ret == Z_STREAM_END)
-      {
-         /* Do this for safety; we won't read any more into this row. */
-         png_ptr->zstream.next_out = NULL;
-
-         png_ptr->mode |= PNG_AFTER_IDAT;
-         png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
-
-         if (png_ptr->zstream.avail_in > 0 || png_ptr->idat_size > 0)
-            png_chunk_benign_error(png_ptr, "Extra compressed data");
-         break;
-      }
-
-      if (ret != Z_OK)
-      {
-         png_zstream_error(png_ptr, ret);
-
-         if (output != NULL)
-            png_chunk_error(png_ptr, png_ptr->zstream.msg);
-
-         else /* checking */
-         {
-            png_chunk_benign_error(png_ptr, png_ptr->zstream.msg);
-            return;
-         }
-      }
-   } while (avail_out > 0);
-
-   if (avail_out > 0)
-   {
-      /* The stream ended before the image; this is the same as too few IDATs so
-       * should be handled the same way.
-       */
-      if (output != NULL)
-         png_error(png_ptr, "Not enough image data");
-
-      else /* the deflate stream contained extra data */
-         png_chunk_benign_error(png_ptr, "Too much image data");
-   }
-}
-
-void /* PRIVATE */
-png_read_finish_IDAT(png_structrp png_ptr)
-{
-   /* We don't need any more data and the stream should have ended, however the
-    * LZ end code may actually not have been processed.  In this case we must
-    * read it otherwise stray unread IDAT data or, more likely, an IDAT chunk
-    * may still remain to be consumed.
-    */
-   if ((png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED) == 0)
-   {
-      /* The NULL causes png_read_IDAT_data to swallow any remaining bytes in
-       * the compressed stream, but the stream may be damaged too, so even after
-       * this call we may need to terminate the zstream ownership.
-       */
-      png_read_IDAT_data(png_ptr, NULL, 0);
-      png_ptr->zstream.next_out = NULL; /* safety */
-
-      /* Now clear everything out for safety; the following may not have been
-       * done.
-       */
-      if ((png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED) == 0)
-      {
-         png_ptr->mode |= PNG_AFTER_IDAT;
-         png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED;
-      }
-   }
-
-   /* If the zstream has not been released do it now *and* terminate the reading
-    * of the final IDAT chunk.
-    */
-   if (png_ptr->zowner == png_IDAT)
-   {
-      /* Always do this; the pointers otherwise point into the read buffer. */
-      png_ptr->zstream.next_in = NULL;
-      png_ptr->zstream.avail_in = 0;
-
-      /* Now we no longer own the zstream. */
-      png_ptr->zowner = 0;
-
-      /* The slightly weird semantics of the sequential IDAT reading is that we
-       * are always in or at the end of an IDAT chunk, so we always need to do a
-       * crc_finish here.  If idat_size is non-zero we also need to read the
-       * spurious bytes at the end of the chunk now.
-       */
-      (void)png_crc_finish(png_ptr, png_ptr->idat_size);
-   }
-}
-
-void /* PRIVATE */
-png_read_finish_row(png_structrp png_ptr)
-{
-   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
-
-   /* Start of interlace block */
-   static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
-
-   /* Offset to next interlace block */
-   static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
-
-   /* Start of interlace block in the y direction */
-   static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
-
-   /* Offset to next interlace block in the y direction */
-   static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
-
-   png_debug(1, "in png_read_finish_row");
-   png_ptr->row_number++;
-   if (png_ptr->row_number < png_ptr->num_rows)
-      return;
-
-   if (png_ptr->interlaced != 0)
-   {
-      png_ptr->row_number = 0;
-
-      /* TO DO: don't do this if prev_row isn't needed (requires
-       * read-ahead of the next row's filter byte.
-       */
-      memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
-
-      do
-      {
-         png_ptr->pass++;
-
-         if (png_ptr->pass >= 7)
-            break;
-
-         png_ptr->iwidth = (png_ptr->width +
-            png_pass_inc[png_ptr->pass] - 1 -
-            png_pass_start[png_ptr->pass]) /
-            png_pass_inc[png_ptr->pass];
-
-         if ((png_ptr->transformations & PNG_INTERLACE) == 0)
-         {
-            png_ptr->num_rows = (png_ptr->height +
-                png_pass_yinc[png_ptr->pass] - 1 -
-                png_pass_ystart[png_ptr->pass]) /
-                png_pass_yinc[png_ptr->pass];
-         }
-
-         else  /* if (png_ptr->transformations & PNG_INTERLACE) */
-            break; /* libpng deinterlacing sees every row */
-
-      } while (png_ptr->num_rows == 0 || png_ptr->iwidth == 0);
-
-      if (png_ptr->pass < 7)
-         return;
-   }
-
-   /* Here after at the end of the last row of the last pass. */
-   png_read_finish_IDAT(png_ptr);
-}
-#endif /* SEQUENTIAL_READ */
-
-void /* PRIVATE */
-png_read_start_row(png_structrp png_ptr)
-{
-   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
-
-   /* Start of interlace block */
-   static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
-
-   /* Offset to next interlace block */
-   static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
-
-   /* Start of interlace block in the y direction */
-   static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
-
-   /* Offset to next interlace block in the y direction */
-   static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
-
-   unsigned int max_pixel_depth;
-   png_size_t row_bytes;
-
-   png_debug(1, "in png_read_start_row");
-
-#ifdef PNG_READ_TRANSFORMS_SUPPORTED
-   png_init_read_transformations(png_ptr);
-#endif
-   if (png_ptr->interlaced != 0)
-   {
-      if ((png_ptr->transformations & PNG_INTERLACE) == 0)
-         png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -
-             png_pass_ystart[0]) / png_pass_yinc[0];
-
-      else
-         png_ptr->num_rows = png_ptr->height;
-
-      png_ptr->iwidth = (png_ptr->width +
-          png_pass_inc[png_ptr->pass] - 1 -
-          png_pass_start[png_ptr->pass]) /
-          png_pass_inc[png_ptr->pass];
-   }
-
-   else
-   {
-      png_ptr->num_rows = png_ptr->height;
-      png_ptr->iwidth = png_ptr->width;
-   }
-
-   max_pixel_depth = (unsigned int)png_ptr->pixel_depth;
-
-   /* WARNING: * png_read_transform_info (pngrtran.c) performs a simpler set of
-    * calculations to calculate the final pixel depth, then
-    * png_do_read_transforms actually does the transforms.  This means that the
-    * code which effectively calculates this value is actually repeated in three
-    * separate places.  They must all match.  Innocent changes to the order of
-    * transformations can and will break libpng in a way that causes memory
-    * overwrites.
-    *
-    * TODO: fix this.
-    */
-#ifdef PNG_READ_PACK_SUPPORTED
-   if ((png_ptr->transformations & PNG_PACK) != 0 && png_ptr->bit_depth < 8)
-      max_pixel_depth = 8;
-#endif
-
-#ifdef PNG_READ_EXPAND_SUPPORTED
-   if ((png_ptr->transformations & PNG_EXPAND) != 0)
-   {
-      if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      {
-         if (png_ptr->num_trans != 0)
-            max_pixel_depth = 32;
-
-         else
-            max_pixel_depth = 24;
-      }
-
-      else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
-      {
-         if (max_pixel_depth < 8)
-            max_pixel_depth = 8;
-
-         if (png_ptr->num_trans != 0)
-            max_pixel_depth *= 2;
-      }
-
-      else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
-      {
-         if (png_ptr->num_trans != 0)
-         {
-            max_pixel_depth *= 4;
-            max_pixel_depth /= 3;
-         }
-      }
-   }
-#endif
-
-#ifdef PNG_READ_EXPAND_16_SUPPORTED
-   if ((png_ptr->transformations & PNG_EXPAND_16) != 0)
-   {
-#  ifdef PNG_READ_EXPAND_SUPPORTED
-      /* In fact it is an error if it isn't supported, but checking is
-       * the safe way.
-       */
-      if ((png_ptr->transformations & PNG_EXPAND) != 0)
-      {
-         if (png_ptr->bit_depth < 16)
-            max_pixel_depth *= 2;
-      }
-      else
-#  endif
-      png_ptr->transformations &= ~PNG_EXPAND_16;
-   }
-#endif
-
-#ifdef PNG_READ_FILLER_SUPPORTED
-   if ((png_ptr->transformations & (PNG_FILLER)) != 0)
-   {
-      if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
-      {
-         if (max_pixel_depth <= 8)
-            max_pixel_depth = 16;
-
-         else
-            max_pixel_depth = 32;
-      }
-
-      else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB ||
-         png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      {
-         if (max_pixel_depth <= 32)
-            max_pixel_depth = 32;
-
-         else
-            max_pixel_depth = 64;
-      }
-   }
-#endif
-
-#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
-   if ((png_ptr->transformations & PNG_GRAY_TO_RGB) != 0)
-   {
-      if (
-#ifdef PNG_READ_EXPAND_SUPPORTED
-          (png_ptr->num_trans != 0 &&
-          (png_ptr->transformations & PNG_EXPAND) != 0) ||
-#endif
-#ifdef PNG_READ_FILLER_SUPPORTED
-          (png_ptr->transformations & (PNG_FILLER)) != 0 ||
-#endif
-          png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
-      {
-         if (max_pixel_depth <= 16)
-            max_pixel_depth = 32;
-
-         else
-            max_pixel_depth = 64;
-      }
-
-      else
-      {
-         if (max_pixel_depth <= 8)
-         {
-            if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
-               max_pixel_depth = 32;
-
-            else
-               max_pixel_depth = 24;
-         }
-
-         else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
-            max_pixel_depth = 64;
-
-         else
-            max_pixel_depth = 48;
-      }
-   }
-#endif
-
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) && \
-defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
-   if ((png_ptr->transformations & PNG_USER_TRANSFORM) != 0)
-   {
-      unsigned int user_pixel_depth = png_ptr->user_transform_depth *
-         png_ptr->user_transform_channels;
-
-      if (user_pixel_depth > max_pixel_depth)
-         max_pixel_depth = user_pixel_depth;
-   }
-#endif
-
-   /* This value is stored in png_struct and double checked in the row read
-    * code.
-    */
-   png_ptr->maximum_pixel_depth = (png_byte)max_pixel_depth;
-   png_ptr->transformed_pixel_depth = 0; /* calculated on demand */
-
-   /* Align the width on the next larger 8 pixels.  Mainly used
-    * for interlacing
-    */
-   row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
-   /* Calculate the maximum bytes needed, adding a byte and a pixel
-    * for safety's sake
-    */
-   row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) +
-       1 + ((max_pixel_depth + 7) >> 3U);
-
-#ifdef PNG_MAX_MALLOC_64K
-   if (row_bytes > (png_uint_32)65536L)
-      png_error(png_ptr, "This image requires a row greater than 64KB");
-#endif
-
-   if (row_bytes + 48 > png_ptr->old_big_row_buf_size)
-   {
-      png_free(png_ptr, png_ptr->big_row_buf);
-      png_free(png_ptr, png_ptr->big_prev_row);
-
-      if (png_ptr->interlaced != 0)
-         png_ptr->big_row_buf = (png_bytep)png_calloc(png_ptr,
-             row_bytes + 48);
-
-      else
-         png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes + 48);
-
-      png_ptr->big_prev_row = (png_bytep)png_malloc(png_ptr, row_bytes + 48);
-
-#ifdef PNG_ALIGNED_MEMORY_SUPPORTED
-      /* Use 16-byte aligned memory for row_buf with at least 16 bytes
-       * of padding before and after row_buf; treat prev_row similarly.
-       * NOTE: the alignment is to the start of the pixels, one beyond the start
-       * of the buffer, because of the filter byte.  Prior to libpng 1.5.6 this
-       * was incorrect; the filter byte was aligned, which had the exact
-       * opposite effect of that intended.
-       */
-      {
-         png_bytep temp = png_ptr->big_row_buf + 32;
-         int extra = (int)((temp - (png_bytep)0) & 0x0f);
-         png_ptr->row_buf = temp - extra - 1/*filter byte*/;
-
-         temp = png_ptr->big_prev_row + 32;
-         extra = (int)((temp - (png_bytep)0) & 0x0f);
-         png_ptr->prev_row = temp - extra - 1/*filter byte*/;
-      }
-
-#else
-      /* Use 31 bytes of padding before and 17 bytes after row_buf. */
-      png_ptr->row_buf = png_ptr->big_row_buf + 31;
-      png_ptr->prev_row = png_ptr->big_prev_row + 31;
-#endif
-      png_ptr->old_big_row_buf_size = row_bytes + 48;
-   }
-
-#ifdef PNG_MAX_MALLOC_64K
-   if (png_ptr->rowbytes > 65535)
-      png_error(png_ptr, "This image requires a row greater than 64KB");
-
-#endif
-   if (png_ptr->rowbytes > (PNG_SIZE_MAX - 1))
-      png_error(png_ptr, "Row has too many bytes to allocate in memory");
-
-   memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
-
-   png_debug1(3, "width = %u,", png_ptr->width);
-   png_debug1(3, "height = %u,", png_ptr->height);
-   png_debug1(3, "iwidth = %u,", png_ptr->iwidth);
-   png_debug1(3, "num_rows = %u,", png_ptr->num_rows);
-   png_debug1(3, "rowbytes = %lu,", (unsigned long)png_ptr->rowbytes);
-   png_debug1(3, "irowbytes = %lu",
-       (unsigned long)PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1);
-
-   /* The sequential reader needs a buffer for IDAT, but the progressive reader
-    * does not, so free the read buffer now regardless; the sequential reader
-    * reallocates it on demand.
-    */
-   if (png_ptr->read_buffer != NULL)
-   {
-      png_bytep buffer = png_ptr->read_buffer;
-
-      png_ptr->read_buffer_size = 0;
-      png_ptr->read_buffer = NULL;
-      png_free(png_ptr, buffer);
-   }
-
-   /* Finally claim the zstream for the inflate of the IDAT data, use the bits
-    * value from the stream (note that this will result in a fatal error if the
-    * IDAT stream has a bogus deflate header window_bits value, but this should
-    * not be happening any longer!)
-    */
-   if (png_inflate_claim(png_ptr, png_IDAT) != Z_OK)
-      png_error(png_ptr, png_ptr->zstream.msg);
-
-   png_ptr->flags |= PNG_FLAG_ROW_INIT;
-}
-#endif /* READ */
diff --git a/src/png/libpng/pngset.c b/src/png/libpng/pngset.c
deleted file mode 100644
index 6f3a1ee11..000000000
--- a/src/png/libpng/pngset.c
+++ /dev/null
@@ -1,1802 +0,0 @@
-
-/* pngset.c - storage of image information into info struct
- *
- * Last changed in libpng 1.6.32 [August 24, 2017]
- * Copyright (c) 1998-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * The functions here are used during reads to store data from the file
- * into the info struct, and during writes to store application data
- * into the info struct for writing into the file.  This abstracts the
- * info struct and allows us to change the structure in the future.
- */
-
-#include "pngpriv.h"
-
-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-
-#ifdef PNG_bKGD_SUPPORTED
-void PNGAPI
-png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_color_16p background)
-{
-   png_debug1(1, "in %s storage function", "bKGD");
-
-   if (png_ptr == NULL || info_ptr == NULL || background == NULL)
-      return;
-
-   info_ptr->background = *background;
-   info_ptr->valid |= PNG_INFO_bKGD;
-}
-#endif
-
-#ifdef PNG_cHRM_SUPPORTED
-void PNGFAPI
-png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
-    png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
-    png_fixed_point blue_x, png_fixed_point blue_y)
-{
-   png_xy xy;
-
-   png_debug1(1, "in %s storage function", "cHRM fixed");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   xy.redx = red_x;
-   xy.redy = red_y;
-   xy.greenx = green_x;
-   xy.greeny = green_y;
-   xy.bluex = blue_x;
-   xy.bluey = blue_y;
-   xy.whitex = white_x;
-   xy.whitey = white_y;
-
-   if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy,
-       2/* override with app values*/) != 0)
-      info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
-
-   png_colorspace_sync_info(png_ptr, info_ptr);
-}
-
-void PNGFAPI
-png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_fixed_point int_red_X, png_fixed_point int_red_Y,
-    png_fixed_point int_red_Z, png_fixed_point int_green_X,
-    png_fixed_point int_green_Y, png_fixed_point int_green_Z,
-    png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
-    png_fixed_point int_blue_Z)
-{
-   png_XYZ XYZ;
-
-   png_debug1(1, "in %s storage function", "cHRM XYZ fixed");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   XYZ.red_X = int_red_X;
-   XYZ.red_Y = int_red_Y;
-   XYZ.red_Z = int_red_Z;
-   XYZ.green_X = int_green_X;
-   XYZ.green_Y = int_green_Y;
-   XYZ.green_Z = int_green_Z;
-   XYZ.blue_X = int_blue_X;
-   XYZ.blue_Y = int_blue_Y;
-   XYZ.blue_Z = int_blue_Z;
-
-   if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace,
-       &XYZ, 2) != 0)
-      info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM;
-
-   png_colorspace_sync_info(png_ptr, info_ptr);
-}
-
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-void PNGAPI
-png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
-    double white_x, double white_y, double red_x, double red_y,
-    double green_x, double green_y, double blue_x, double blue_y)
-{
-   png_set_cHRM_fixed(png_ptr, info_ptr,
-       png_fixed(png_ptr, white_x, "cHRM White X"),
-       png_fixed(png_ptr, white_y, "cHRM White Y"),
-       png_fixed(png_ptr, red_x, "cHRM Red X"),
-       png_fixed(png_ptr, red_y, "cHRM Red Y"),
-       png_fixed(png_ptr, green_x, "cHRM Green X"),
-       png_fixed(png_ptr, green_y, "cHRM Green Y"),
-       png_fixed(png_ptr, blue_x, "cHRM Blue X"),
-       png_fixed(png_ptr, blue_y, "cHRM Blue Y"));
-}
-
-void PNGAPI
-png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X,
-    double red_Y, double red_Z, double green_X, double green_Y, double green_Z,
-    double blue_X, double blue_Y, double blue_Z)
-{
-   png_set_cHRM_XYZ_fixed(png_ptr, info_ptr,
-       png_fixed(png_ptr, red_X, "cHRM Red X"),
-       png_fixed(png_ptr, red_Y, "cHRM Red Y"),
-       png_fixed(png_ptr, red_Z, "cHRM Red Z"),
-       png_fixed(png_ptr, green_X, "cHRM Green X"),
-       png_fixed(png_ptr, green_Y, "cHRM Green Y"),
-       png_fixed(png_ptr, green_Z, "cHRM Green Z"),
-       png_fixed(png_ptr, blue_X, "cHRM Blue X"),
-       png_fixed(png_ptr, blue_Y, "cHRM Blue Y"),
-       png_fixed(png_ptr, blue_Z, "cHRM Blue Z"));
-}
-#  endif /* FLOATING_POINT */
-
-#endif /* cHRM */
-
-#ifdef PNG_eXIf_SUPPORTED
-void PNGAPI
-png_set_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
-    const png_bytep eXIf_buf)
-{
-  png_warning(png_ptr, "png_set_eXIf does not work; use png_set_eXIf_1");
-  PNG_UNUSED(info_ptr)
-  PNG_UNUSED(eXIf_buf)
-}
-
-void PNGAPI
-png_set_eXIf_1(png_const_structrp png_ptr, png_inforp info_ptr,
-    const png_uint_32 num_exif, const png_bytep eXIf_buf)
-{
-   int i;
-
-   png_debug1(1, "in %s storage function", "eXIf");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   if (info_ptr->exif)
-   {
-      png_free(png_ptr, info_ptr->exif);
-      info_ptr->exif = NULL;
-   }
-
-   info_ptr->num_exif = num_exif;
-
-   info_ptr->exif = png_voidcast(png_bytep, png_malloc_warn(png_ptr,
-       info_ptr->num_exif));
-
-   if (info_ptr->exif == NULL)
-   {
-      png_warning(png_ptr, "Insufficient memory for eXIf chunk data");
-      return;
-   }
-
-   info_ptr->free_me |= PNG_FREE_EXIF;
-
-   for (i = 0; i < (int) info_ptr->num_exif; i++)
-      info_ptr->exif[i] = eXIf_buf[i];
-
-   info_ptr->valid |= PNG_INFO_eXIf;
-}
-#endif /* eXIf */
-
-#ifdef PNG_gAMA_SUPPORTED
-void PNGFAPI
-png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_fixed_point file_gamma)
-{
-   png_debug1(1, "in %s storage function", "gAMA");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma);
-   png_colorspace_sync_info(png_ptr, info_ptr);
-}
-
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-void PNGAPI
-png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
-{
-   png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma,
-       "png_set_gAMA"));
-}
-#  endif
-#endif
-
-#ifdef PNG_hIST_SUPPORTED
-void PNGAPI
-png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_uint_16p hist)
-{
-   int i;
-
-   png_debug1(1, "in %s storage function", "hIST");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   if (info_ptr->num_palette == 0 || info_ptr->num_palette
-       > PNG_MAX_PALETTE_LENGTH)
-   {
-      png_warning(png_ptr,
-          "Invalid palette size, hIST allocation skipped");
-
-      return;
-   }
-
-   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
-
-   /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in
-    * version 1.2.1
-    */
-   info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr,
-       PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16))));
-
-   if (info_ptr->hist == NULL)
-   {
-      png_warning(png_ptr, "Insufficient memory for hIST chunk data");
-
-      return;
-   }
-
-   info_ptr->free_me |= PNG_FREE_HIST;
-
-   for (i = 0; i < info_ptr->num_palette; i++)
-      info_ptr->hist[i] = hist[i];
-
-   info_ptr->valid |= PNG_INFO_hIST;
-}
-#endif
-
-void PNGAPI
-png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_uint_32 width, png_uint_32 height, int bit_depth,
-    int color_type, int interlace_type, int compression_type,
-    int filter_type)
-{
-   png_debug1(1, "in %s storage function", "IHDR");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   info_ptr->width = width;
-   info_ptr->height = height;
-   info_ptr->bit_depth = (png_byte)bit_depth;
-   info_ptr->color_type = (png_byte)color_type;
-   info_ptr->compression_type = (png_byte)compression_type;
-   info_ptr->filter_type = (png_byte)filter_type;
-   info_ptr->interlace_type = (png_byte)interlace_type;
-
-   png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height,
-       info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
-       info_ptr->compression_type, info_ptr->filter_type);
-
-   if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      info_ptr->channels = 1;
-
-   else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0)
-      info_ptr->channels = 3;
-
-   else
-      info_ptr->channels = 1;
-
-   if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0)
-      info_ptr->channels++;
-
-   info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
-
-   info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width);
-}
-
-#ifdef PNG_oFFs_SUPPORTED
-void PNGAPI
-png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_int_32 offset_x, png_int_32 offset_y, int unit_type)
-{
-   png_debug1(1, "in %s storage function", "oFFs");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   info_ptr->x_offset = offset_x;
-   info_ptr->y_offset = offset_y;
-   info_ptr->offset_unit_type = (png_byte)unit_type;
-   info_ptr->valid |= PNG_INFO_oFFs;
-}
-#endif
-
-#ifdef PNG_pCAL_SUPPORTED
-void PNGAPI
-png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
-    int nparams, png_const_charp units, png_charpp params)
-{
-   png_size_t length;
-   int i;
-
-   png_debug1(1, "in %s storage function", "pCAL");
-
-   if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL
-       || (nparams > 0 && params == NULL))
-      return;
-
-   length = strlen(purpose) + 1;
-   png_debug1(3, "allocating purpose for info (%lu bytes)",
-       (unsigned long)length);
-
-   /* TODO: validate format of calibration name and unit name */
-
-   /* Check that the type matches the specification. */
-   if (type < 0 || type > 3)
-   {
-      png_chunk_report(png_ptr, "Invalid pCAL equation type",
-            PNG_CHUNK_WRITE_ERROR);
-      return;
-   }
-
-   if (nparams < 0 || nparams > 255)
-   {
-      png_chunk_report(png_ptr, "Invalid pCAL parameter count",
-            PNG_CHUNK_WRITE_ERROR);
-      return;
-   }
-
-   /* Validate params[nparams] */
-   for (i=0; i<nparams; ++i)
-   {
-      if (params[i] == NULL ||
-          !png_check_fp_string(params[i], strlen(params[i])))
-      {
-         png_chunk_report(png_ptr, "Invalid format for pCAL parameter",
-               PNG_CHUNK_WRITE_ERROR);
-         return;
-      }
-   }
-
-   info_ptr->pcal_purpose = png_voidcast(png_charp,
-       png_malloc_warn(png_ptr, length));
-
-   if (info_ptr->pcal_purpose == NULL)
-   {
-      png_chunk_report(png_ptr, "Insufficient memory for pCAL purpose",
-            PNG_CHUNK_WRITE_ERROR);
-      return;
-   }
-
-   memcpy(info_ptr->pcal_purpose, purpose, length);
-
-   png_debug(3, "storing X0, X1, type, and nparams in info");
-   info_ptr->pcal_X0 = X0;
-   info_ptr->pcal_X1 = X1;
-   info_ptr->pcal_type = (png_byte)type;
-   info_ptr->pcal_nparams = (png_byte)nparams;
-
-   length = strlen(units) + 1;
-   png_debug1(3, "allocating units for info (%lu bytes)",
-       (unsigned long)length);
-
-   info_ptr->pcal_units = png_voidcast(png_charp,
-       png_malloc_warn(png_ptr, length));
-
-   if (info_ptr->pcal_units == NULL)
-   {
-      png_warning(png_ptr, "Insufficient memory for pCAL units");
-
-      return;
-   }
-
-   memcpy(info_ptr->pcal_units, units, length);
-
-   info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
-       (png_size_t)(((unsigned int)nparams + 1) * (sizeof (png_charp)))));
-
-   if (info_ptr->pcal_params == NULL)
-   {
-      png_warning(png_ptr, "Insufficient memory for pCAL params");
-
-      return;
-   }
-
-   memset(info_ptr->pcal_params, 0, ((unsigned int)nparams + 1) *
-       (sizeof (png_charp)));
-
-   for (i = 0; i < nparams; i++)
-   {
-      length = strlen(params[i]) + 1;
-      png_debug2(3, "allocating parameter %d for info (%lu bytes)", i,
-          (unsigned long)length);
-
-      info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
-
-      if (info_ptr->pcal_params[i] == NULL)
-      {
-         png_warning(png_ptr, "Insufficient memory for pCAL parameter");
-
-         return;
-      }
-
-      memcpy(info_ptr->pcal_params[i], params[i], length);
-   }
-
-   info_ptr->valid |= PNG_INFO_pCAL;
-   info_ptr->free_me |= PNG_FREE_PCAL;
-}
-#endif
-
-#ifdef PNG_sCAL_SUPPORTED
-void PNGAPI
-png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
-    int unit, png_const_charp swidth, png_const_charp sheight)
-{
-   png_size_t lengthw = 0, lengthh = 0;
-
-   png_debug1(1, "in %s storage function", "sCAL");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   /* Double check the unit (should never get here with an invalid
-    * unit unless this is an API call.)
-    */
-   if (unit != 1 && unit != 2)
-      png_error(png_ptr, "Invalid sCAL unit");
-
-   if (swidth == NULL || (lengthw = strlen(swidth)) == 0 ||
-       swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw))
-      png_error(png_ptr, "Invalid sCAL width");
-
-   if (sheight == NULL || (lengthh = strlen(sheight)) == 0 ||
-       sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh))
-      png_error(png_ptr, "Invalid sCAL height");
-
-   info_ptr->scal_unit = (png_byte)unit;
-
-   ++lengthw;
-
-   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw);
-
-   info_ptr->scal_s_width = png_voidcast(png_charp,
-       png_malloc_warn(png_ptr, lengthw));
-
-   if (info_ptr->scal_s_width == NULL)
-   {
-      png_warning(png_ptr, "Memory allocation failed while processing sCAL");
-
-      return;
-   }
-
-   memcpy(info_ptr->scal_s_width, swidth, lengthw);
-
-   ++lengthh;
-
-   png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh);
-
-   info_ptr->scal_s_height = png_voidcast(png_charp,
-       png_malloc_warn(png_ptr, lengthh));
-
-   if (info_ptr->scal_s_height == NULL)
-   {
-      png_free (png_ptr, info_ptr->scal_s_width);
-      info_ptr->scal_s_width = NULL;
-
-      png_warning(png_ptr, "Memory allocation failed while processing sCAL");
-
-      return;
-   }
-
-   memcpy(info_ptr->scal_s_height, sheight, lengthh);
-
-   info_ptr->valid |= PNG_INFO_sCAL;
-   info_ptr->free_me |= PNG_FREE_SCAL;
-}
-
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-void PNGAPI
-png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
-    double width, double height)
-{
-   png_debug1(1, "in %s storage function", "sCAL");
-
-   /* Check the arguments. */
-   if (width <= 0)
-      png_warning(png_ptr, "Invalid sCAL width ignored");
-
-   else if (height <= 0)
-      png_warning(png_ptr, "Invalid sCAL height ignored");
-
-   else
-   {
-      /* Convert 'width' and 'height' to ASCII. */
-      char swidth[PNG_sCAL_MAX_DIGITS+1];
-      char sheight[PNG_sCAL_MAX_DIGITS+1];
-
-      png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width,
-          PNG_sCAL_PRECISION);
-      png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height,
-          PNG_sCAL_PRECISION);
-
-      png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
-   }
-}
-#  endif
-
-#  ifdef PNG_FIXED_POINT_SUPPORTED
-void PNGAPI
-png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit,
-    png_fixed_point width, png_fixed_point height)
-{
-   png_debug1(1, "in %s storage function", "sCAL");
-
-   /* Check the arguments. */
-   if (width <= 0)
-      png_warning(png_ptr, "Invalid sCAL width ignored");
-
-   else if (height <= 0)
-      png_warning(png_ptr, "Invalid sCAL height ignored");
-
-   else
-   {
-      /* Convert 'width' and 'height' to ASCII. */
-      char swidth[PNG_sCAL_MAX_DIGITS+1];
-      char sheight[PNG_sCAL_MAX_DIGITS+1];
-
-      png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width);
-      png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height);
-
-      png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
-   }
-}
-#  endif
-#endif
-
-#ifdef PNG_pHYs_SUPPORTED
-void PNGAPI
-png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_uint_32 res_x, png_uint_32 res_y, int unit_type)
-{
-   png_debug1(1, "in %s storage function", "pHYs");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   info_ptr->x_pixels_per_unit = res_x;
-   info_ptr->y_pixels_per_unit = res_y;
-   info_ptr->phys_unit_type = (png_byte)unit_type;
-   info_ptr->valid |= PNG_INFO_pHYs;
-}
-#endif
-
-void PNGAPI
-png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr,
-    png_const_colorp palette, int num_palette)
-{
-
-   png_uint_32 max_palette_length;
-
-   png_debug1(1, "in %s storage function", "PLTE");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
-      (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
-
-   if (num_palette < 0 || num_palette > (int) max_palette_length)
-   {
-      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-         png_error(png_ptr, "Invalid palette length");
-
-      else
-      {
-         png_warning(png_ptr, "Invalid palette length");
-
-         return;
-      }
-   }
-
-   if ((num_palette > 0 && palette == NULL) ||
-      (num_palette == 0
-#        ifdef PNG_MNG_FEATURES_SUPPORTED
-            && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
-#        endif
-      ))
-   {
-      png_error(png_ptr, "Invalid palette");
-   }
-
-   /* It may not actually be necessary to set png_ptr->palette here;
-    * we do it for backward compatibility with the way the png_handle_tRNS
-    * function used to do the allocation.
-    *
-    * 1.6.0: the above statement appears to be incorrect; something has to set
-    * the palette inside png_struct on read.
-    */
-   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
-
-   /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
-    * of num_palette entries, in case of an invalid PNG file or incorrect
-    * call to png_set_PLTE() with too-large sample values.
-    */
-   png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr,
-       PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
-
-   if (num_palette > 0)
-      memcpy(png_ptr->palette, palette, (unsigned int)num_palette *
-          (sizeof (png_color)));
-   info_ptr->palette = png_ptr->palette;
-   info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
-
-   info_ptr->free_me |= PNG_FREE_PLTE;
-
-   info_ptr->valid |= PNG_INFO_PLTE;
-}
-
-#ifdef PNG_sBIT_SUPPORTED
-void PNGAPI
-png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_color_8p sig_bit)
-{
-   png_debug1(1, "in %s storage function", "sBIT");
-
-   if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL)
-      return;
-
-   info_ptr->sig_bit = *sig_bit;
-   info_ptr->valid |= PNG_INFO_sBIT;
-}
-#endif
-
-#ifdef PNG_sRGB_SUPPORTED
-void PNGAPI
-png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
-{
-   png_debug1(1, "in %s storage function", "sRGB");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent);
-   png_colorspace_sync_info(png_ptr, info_ptr);
-}
-
-void PNGAPI
-png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr,
-    int srgb_intent)
-{
-   png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace,
-       srgb_intent) != 0)
-   {
-      /* This causes the gAMA and cHRM to be written too */
-      info_ptr->colorspace.flags |=
-         PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
-   }
-
-   png_colorspace_sync_info(png_ptr, info_ptr);
-}
-#endif /* sRGB */
-
-
-#ifdef PNG_iCCP_SUPPORTED
-void PNGAPI
-png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_charp name, int compression_type,
-    png_const_bytep profile, png_uint_32 proflen)
-{
-   png_charp new_iccp_name;
-   png_bytep new_iccp_profile;
-   png_size_t length;
-
-   png_debug1(1, "in %s storage function", "iCCP");
-
-   if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
-      return;
-
-   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
-      png_app_error(png_ptr, "Invalid iCCP compression method");
-
-   /* Set the colorspace first because this validates the profile; do not
-    * override previously set app cHRM or gAMA here (because likely as not the
-    * application knows better than libpng what the correct values are.)  Pass
-    * the info_ptr color_type field to png_colorspace_set_ICC because in the
-    * write case it has not yet been stored in png_ptr.
-    */
-   {
-      int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name,
-          proflen, profile, info_ptr->color_type);
-
-      png_colorspace_sync_info(png_ptr, info_ptr);
-
-      /* Don't do any of the copying if the profile was bad, or inconsistent. */
-      if (result == 0)
-         return;
-
-      /* But do write the gAMA and cHRM chunks from the profile. */
-      info_ptr->colorspace.flags |=
-         PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM;
-   }
-
-   length = strlen(name)+1;
-   new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length));
-
-   if (new_iccp_name == NULL)
-   {
-      png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk");
-
-      return;
-   }
-
-   memcpy(new_iccp_name, name, length);
-   new_iccp_profile = png_voidcast(png_bytep,
-       png_malloc_warn(png_ptr, proflen));
-
-   if (new_iccp_profile == NULL)
-   {
-      png_free(png_ptr, new_iccp_name);
-      png_benign_error(png_ptr,
-          "Insufficient memory to process iCCP profile");
-
-      return;
-   }
-
-   memcpy(new_iccp_profile, profile, proflen);
-
-   png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
-
-   info_ptr->iccp_proflen = proflen;
-   info_ptr->iccp_name = new_iccp_name;
-   info_ptr->iccp_profile = new_iccp_profile;
-   info_ptr->free_me |= PNG_FREE_ICCP;
-   info_ptr->valid |= PNG_INFO_iCCP;
-}
-#endif
-
-#ifdef PNG_TEXT_SUPPORTED
-void PNGAPI
-png_set_text(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_textp text_ptr, int num_text)
-{
-   int ret;
-   ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
-
-   if (ret != 0)
-      png_error(png_ptr, "Insufficient memory to store text");
-}
-
-int /* PRIVATE */
-png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_textp text_ptr, int num_text)
-{
-   int i;
-
-   png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U :
-      (unsigned long)png_ptr->chunk_name);
-
-   if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL)
-      return(0);
-
-   /* Make sure we have enough space in the "text" array in info_struct
-    * to hold all of the incoming text_ptr objects.  This compare can't overflow
-    * because max_text >= num_text (anyway, subtract of two positive integers
-    * can't overflow in any case.)
-    */
-   if (num_text > info_ptr->max_text - info_ptr->num_text)
-   {
-      int old_num_text = info_ptr->num_text;
-      int max_text;
-      png_textp new_text = NULL;
-
-      /* Calculate an appropriate max_text, checking for overflow. */
-      max_text = old_num_text;
-      if (num_text <= INT_MAX - max_text)
-      {
-         max_text += num_text;
-
-         /* Round up to a multiple of 8 */
-         if (max_text < INT_MAX-8)
-            max_text = (max_text + 8) & ~0x7;
-
-         else
-            max_text = INT_MAX;
-
-         /* Now allocate a new array and copy the old members in; this does all
-          * the overflow checks.
-          */
-         new_text = png_voidcast(png_textp,png_realloc_array(png_ptr,
-             info_ptr->text, old_num_text, max_text-old_num_text,
-             sizeof *new_text));
-      }
-
-      if (new_text == NULL)
-      {
-         png_chunk_report(png_ptr, "too many text chunks",
-             PNG_CHUNK_WRITE_ERROR);
-
-         return 1;
-      }
-
-      png_free(png_ptr, info_ptr->text);
-
-      info_ptr->text = new_text;
-      info_ptr->free_me |= PNG_FREE_TEXT;
-      info_ptr->max_text = max_text;
-      /* num_text is adjusted below as the entries are copied in */
-
-      png_debug1(3, "allocated %d entries for info_ptr->text", max_text);
-   }
-
-   for (i = 0; i < num_text; i++)
-   {
-      size_t text_length, key_len;
-      size_t lang_len, lang_key_len;
-      png_textp textp = &(info_ptr->text[info_ptr->num_text]);
-
-      if (text_ptr[i].key == NULL)
-          continue;
-
-      if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE ||
-          text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST)
-      {
-         png_chunk_report(png_ptr, "text compression mode is out of range",
-             PNG_CHUNK_WRITE_ERROR);
-         continue;
-      }
-
-      key_len = strlen(text_ptr[i].key);
-
-      if (text_ptr[i].compression <= 0)
-      {
-         lang_len = 0;
-         lang_key_len = 0;
-      }
-
-      else
-#  ifdef PNG_iTXt_SUPPORTED
-      {
-         /* Set iTXt data */
-
-         if (text_ptr[i].lang != NULL)
-            lang_len = strlen(text_ptr[i].lang);
-
-         else
-            lang_len = 0;
-
-         if (text_ptr[i].lang_key != NULL)
-            lang_key_len = strlen(text_ptr[i].lang_key);
-
-         else
-            lang_key_len = 0;
-      }
-#  else /* iTXt */
-      {
-         png_chunk_report(png_ptr, "iTXt chunk not supported",
-             PNG_CHUNK_WRITE_ERROR);
-         continue;
-      }
-#  endif
-
-      if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
-      {
-         text_length = 0;
-#  ifdef PNG_iTXt_SUPPORTED
-         if (text_ptr[i].compression > 0)
-            textp->compression = PNG_ITXT_COMPRESSION_NONE;
-
-         else
-#  endif
-            textp->compression = PNG_TEXT_COMPRESSION_NONE;
-      }
-
-      else
-      {
-         text_length = strlen(text_ptr[i].text);
-         textp->compression = text_ptr[i].compression;
-      }
-
-      textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr,
-          key_len + text_length + lang_len + lang_key_len + 4));
-
-      if (textp->key == NULL)
-      {
-         png_chunk_report(png_ptr, "text chunk: out of memory",
-             PNG_CHUNK_WRITE_ERROR);
-
-         return 1;
-      }
-
-      png_debug2(2, "Allocated %lu bytes at %p in png_set_text",
-          (unsigned long)(png_uint_32)
-          (key_len + lang_len + lang_key_len + text_length + 4),
-          textp->key);
-
-      memcpy(textp->key, text_ptr[i].key, key_len);
-      *(textp->key + key_len) = '\0';
-
-      if (text_ptr[i].compression > 0)
-      {
-         textp->lang = textp->key + key_len + 1;
-         memcpy(textp->lang, text_ptr[i].lang, lang_len);
-         *(textp->lang + lang_len) = '\0';
-         textp->lang_key = textp->lang + lang_len + 1;
-         memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
-         *(textp->lang_key + lang_key_len) = '\0';
-         textp->text = textp->lang_key + lang_key_len + 1;
-      }
-
-      else
-      {
-         textp->lang=NULL;
-         textp->lang_key=NULL;
-         textp->text = textp->key + key_len + 1;
-      }
-
-      if (text_length != 0)
-         memcpy(textp->text, text_ptr[i].text, text_length);
-
-      *(textp->text + text_length) = '\0';
-
-#  ifdef PNG_iTXt_SUPPORTED
-      if (textp->compression > 0)
-      {
-         textp->text_length = 0;
-         textp->itxt_length = text_length;
-      }
-
-      else
-#  endif
-      {
-         textp->text_length = text_length;
-         textp->itxt_length = 0;
-      }
-
-      info_ptr->num_text++;
-      png_debug1(3, "transferred text chunk %d", info_ptr->num_text);
-   }
-
-   return(0);
-}
-#endif
-
-#ifdef PNG_tIME_SUPPORTED
-void PNGAPI
-png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_const_timep mod_time)
-{
-   png_debug1(1, "in %s storage function", "tIME");
-
-   if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL ||
-       (png_ptr->mode & PNG_WROTE_tIME) != 0)
-      return;
-
-   if (mod_time->month == 0   || mod_time->month > 12  ||
-       mod_time->day   == 0   || mod_time->day   > 31  ||
-       mod_time->hour  > 23   || mod_time->minute > 59 ||
-       mod_time->second > 60)
-   {
-      png_warning(png_ptr, "Ignoring invalid time value");
-
-      return;
-   }
-
-   info_ptr->mod_time = *mod_time;
-   info_ptr->valid |= PNG_INFO_tIME;
-}
-#endif
-
-#ifdef PNG_tRNS_SUPPORTED
-void PNGAPI
-png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
-    png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
-{
-   png_debug1(1, "in %s storage function", "tRNS");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-
-      return;
-
-   if (trans_alpha != NULL)
-   {
-       /* It may not actually be necessary to set png_ptr->trans_alpha here;
-        * we do it for backward compatibility with the way the png_handle_tRNS
-        * function used to do the allocation.
-        *
-        * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively
-        * relies on png_set_tRNS storing the information in png_struct
-        * (otherwise it won't be there for the code in pngrtran.c).
-        */
-
-       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
-
-       if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
-       {
-         /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
-          info_ptr->trans_alpha = png_voidcast(png_bytep,
-              png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
-          memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
-       }
-       png_ptr->trans_alpha = info_ptr->trans_alpha;
-   }
-
-   if (trans_color != NULL)
-   {
-#ifdef PNG_WARNINGS_SUPPORTED
-      if (info_ptr->bit_depth < 16)
-      {
-         int sample_max = (1 << info_ptr->bit_depth) - 1;
-
-         if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
-             trans_color->gray > sample_max) ||
-             (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
-             (trans_color->red > sample_max ||
-             trans_color->green > sample_max ||
-             trans_color->blue > sample_max)))
-            png_warning(png_ptr,
-                "tRNS chunk has out-of-range samples for bit_depth");
-      }
-#endif
-
-      info_ptr->trans_color = *trans_color;
-
-      if (num_trans == 0)
-         num_trans = 1;
-   }
-
-   info_ptr->num_trans = (png_uint_16)num_trans;
-
-   if (num_trans != 0)
-   {
-      info_ptr->valid |= PNG_INFO_tRNS;
-      info_ptr->free_me |= PNG_FREE_TRNS;
-   }
-}
-#endif
-
-#ifdef PNG_sPLT_SUPPORTED
-void PNGAPI
-png_set_sPLT(png_const_structrp png_ptr,
-    png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
-/*
- *  entries        - array of png_sPLT_t structures
- *                   to be added to the list of palettes
- *                   in the info structure.
- *
- *  nentries       - number of palette structures to be
- *                   added.
- */
-{
-   png_sPLT_tp np;
-
-   if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL)
-      return;
-
-   /* Use the internal realloc function, which checks for all the possible
-    * overflows.  Notice that the parameters are (int) and (size_t)
-    */
-   np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr,
-       info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries,
-       sizeof *np));
-
-   if (np == NULL)
-   {
-      /* Out of memory or too many chunks */
-      png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR);
-
-      return;
-   }
-
-   png_free(png_ptr, info_ptr->splt_palettes);
-   info_ptr->splt_palettes = np;
-   info_ptr->free_me |= PNG_FREE_SPLT;
-
-   np += info_ptr->splt_palettes_num;
-
-   do
-   {
-      png_size_t length;
-
-      /* Skip invalid input entries */
-      if (entries->name == NULL || entries->entries == NULL)
-      {
-         /* png_handle_sPLT doesn't do this, so this is an app error */
-         png_app_error(png_ptr, "png_set_sPLT: invalid sPLT");
-         /* Just skip the invalid entry */
-         continue;
-      }
-
-      np->depth = entries->depth;
-
-      /* In the event of out-of-memory just return - there's no point keeping
-       * on trying to add sPLT chunks.
-       */
-      length = strlen(entries->name) + 1;
-      np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length));
-
-      if (np->name == NULL)
-         break;
-
-      memcpy(np->name, entries->name, length);
-
-      /* IMPORTANT: we have memory now that won't get freed if something else
-       * goes wrong; this code must free it.  png_malloc_array produces no
-       * warnings; use a png_chunk_report (below) if there is an error.
-       */
-      np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr,
-          entries->nentries, sizeof (png_sPLT_entry)));
-
-      if (np->entries == NULL)
-      {
-         png_free(png_ptr, np->name);
-         np->name = NULL;
-         break;
-      }
-
-      np->nentries = entries->nentries;
-      /* This multiply can't overflow because png_malloc_array has already
-       * checked it when doing the allocation.
-       */
-      memcpy(np->entries, entries->entries,
-          (unsigned int)entries->nentries * sizeof (png_sPLT_entry));
-
-      /* Note that 'continue' skips the advance of the out pointer and out
-       * count, so an invalid entry is not added.
-       */
-      info_ptr->valid |= PNG_INFO_sPLT;
-      ++(info_ptr->splt_palettes_num);
-      ++np;
-      ++entries;
-   }
-   while (--nentries);
-
-   if (nentries > 0)
-      png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
-}
-#endif /* sPLT */
-
-#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
-static png_byte
-check_location(png_const_structrp png_ptr, int location)
-{
-   location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT);
-
-   /* New in 1.6.0; copy the location and check it.  This is an API
-    * change; previously the app had to use the
-    * png_set_unknown_chunk_location API below for each chunk.
-    */
-   if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
-   {
-      /* Write struct, so unknown chunks come from the app */
-      png_app_warning(png_ptr,
-          "png_set_unknown_chunks now expects a valid location");
-      /* Use the old behavior */
-      location = (png_byte)(png_ptr->mode &
-          (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT));
-   }
-
-   /* This need not be an internal error - if the app calls
-    * png_set_unknown_chunks on a read pointer it must get the location right.
-    */
-   if (location == 0)
-      png_error(png_ptr, "invalid location in png_set_unknown_chunks");
-
-   /* Now reduce the location to the top-most set bit by removing each least
-    * significant bit in turn.
-    */
-   while (location != (location & -location))
-      location &= ~(location & -location);
-
-   /* The cast is safe because 'location' is a bit mask and only the low four
-    * bits are significant.
-    */
-   return (png_byte)location;
-}
-
-void PNGAPI
-png_set_unknown_chunks(png_const_structrp png_ptr,
-    png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
-{
-   png_unknown_chunkp np;
-
-   if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 ||
-       unknowns == NULL)
-      return;
-
-   /* Check for the failure cases where support has been disabled at compile
-    * time.  This code is hardly ever compiled - it's here because
-    * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this
-    * code) but may be meaningless if the read or write handling of unknown
-    * chunks is not compiled in.
-    */
-#  if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \
-      defined(PNG_READ_SUPPORTED)
-      if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
-      {
-         png_app_error(png_ptr, "no unknown chunk support on read");
-
-         return;
-      }
-#  endif
-#  if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \
-      defined(PNG_WRITE_SUPPORTED)
-      if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
-      {
-         png_app_error(png_ptr, "no unknown chunk support on write");
-
-         return;
-      }
-#  endif
-
-   /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that
-    * unknown critical chunks could be lost with just a warning resulting in
-    * undefined behavior.  Now png_chunk_report is used to provide behavior
-    * appropriate to read or write.
-    */
-   np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr,
-       info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns,
-       sizeof *np));
-
-   if (np == NULL)
-   {
-      png_chunk_report(png_ptr, "too many unknown chunks",
-          PNG_CHUNK_WRITE_ERROR);
-
-      return;
-   }
-
-   png_free(png_ptr, info_ptr->unknown_chunks);
-   info_ptr->unknown_chunks = np; /* safe because it is initialized */
-   info_ptr->free_me |= PNG_FREE_UNKN;
-
-   np += info_ptr->unknown_chunks_num;
-
-   /* Increment unknown_chunks_num each time round the loop to protect the
-    * just-allocated chunk data.
-    */
-   for (; num_unknowns > 0; --num_unknowns, ++unknowns)
-   {
-      memcpy(np->name, unknowns->name, (sizeof np->name));
-      np->name[(sizeof np->name)-1] = '\0';
-      np->location = check_location(png_ptr, unknowns->location);
-
-      if (unknowns->size == 0)
-      {
-         np->data = NULL;
-         np->size = 0;
-      }
-
-      else
-      {
-         np->data = png_voidcast(png_bytep,
-             png_malloc_base(png_ptr, unknowns->size));
-
-         if (np->data == NULL)
-         {
-            png_chunk_report(png_ptr, "unknown chunk: out of memory",
-                PNG_CHUNK_WRITE_ERROR);
-            /* But just skip storing the unknown chunk */
-            continue;
-         }
-
-         memcpy(np->data, unknowns->data, unknowns->size);
-         np->size = unknowns->size;
-      }
-
-      /* These increments are skipped on out-of-memory for the data - the
-       * unknown chunk entry gets overwritten if the png_chunk_report returns.
-       * This is correct in the read case (the chunk is just dropped.)
-       */
-      ++np;
-      ++(info_ptr->unknown_chunks_num);
-   }
-}
-
-void PNGAPI
-png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr,
-    int chunk, int location)
-{
-   /* This API is pretty pointless in 1.6.0 because the location can be set
-    * before the call to png_set_unknown_chunks.
-    *
-    * TODO: add a png_app_warning in 1.7
-    */
-   if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 &&
-      chunk < info_ptr->unknown_chunks_num)
-   {
-      if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0)
-      {
-         png_app_error(png_ptr, "invalid unknown chunk location");
-         /* Fake out the pre 1.6.0 behavior: */
-         if (((unsigned int)location & PNG_HAVE_IDAT) != 0) /* undocumented! */
-            location = PNG_AFTER_IDAT;
-
-         else
-            location = PNG_HAVE_IHDR; /* also undocumented */
-      }
-
-      info_ptr->unknown_chunks[chunk].location =
-         check_location(png_ptr, location);
-   }
-}
-#endif /* STORE_UNKNOWN_CHUNKS */
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-png_uint_32 PNGAPI
-png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features)
-{
-   png_debug(1, "in png_permit_mng_features");
-
-   if (png_ptr == NULL)
-      return 0;
-
-   png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES;
-
-   return png_ptr->mng_features_permitted;
-}
-#endif
-
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-static unsigned int
-add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep)
-{
-   unsigned int i;
-
-   /* Utility function: update the 'keep' state of a chunk if it is already in
-    * the list, otherwise add it to the list.
-    */
-   for (i=0; i<count; ++i, list += 5)
-   {
-      if (memcmp(list, add, 4) == 0)
-      {
-         list[4] = (png_byte)keep;
-
-         return count;
-      }
-   }
-
-   if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT)
-   {
-      ++count;
-      memcpy(list, add, 4);
-      list[4] = (png_byte)keep;
-   }
-
-   return count;
-}
-
-void PNGAPI
-png_set_keep_unknown_chunks(png_structrp png_ptr, int keep,
-    png_const_bytep chunk_list, int num_chunks_in)
-{
-   png_bytep new_list;
-   unsigned int num_chunks, old_num_chunks;
-
-   if (png_ptr == NULL)
-      return;
-
-   if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST)
-   {
-      png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep");
-
-      return;
-   }
-
-   if (num_chunks_in <= 0)
-   {
-      png_ptr->unknown_default = keep;
-
-      /* '0' means just set the flags, so stop here */
-      if (num_chunks_in == 0)
-        return;
-   }
-
-   if (num_chunks_in < 0)
-   {
-      /* Ignore all unknown chunks and all chunks recognized by
-       * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
-       */
-      static PNG_CONST png_byte chunks_to_ignore[] = {
-         98,  75,  71,  68, '\0',  /* bKGD */
-         99,  72,  82,  77, '\0',  /* cHRM */
-        101,  88,  73, 102, '\0',  /* eXIf */
-        103,  65,  77,  65, '\0',  /* gAMA */
-        104,  73,  83,  84, '\0',  /* hIST */
-        105,  67,  67,  80, '\0',  /* iCCP */
-        105,  84,  88, 116, '\0',  /* iTXt */
-        111,  70,  70, 115, '\0',  /* oFFs */
-        112,  67,  65,  76, '\0',  /* pCAL */
-        112,  72,  89, 115, '\0',  /* pHYs */
-        115,  66,  73,  84, '\0',  /* sBIT */
-        115,  67,  65,  76, '\0',  /* sCAL */
-        115,  80,  76,  84, '\0',  /* sPLT */
-        115,  84,  69,  82, '\0',  /* sTER */
-        115,  82,  71,  66, '\0',  /* sRGB */
-        116,  69,  88, 116, '\0',  /* tEXt */
-        116,  73,  77,  69, '\0',  /* tIME */
-        122,  84,  88, 116, '\0'   /* zTXt */
-      };
-
-      chunk_list = chunks_to_ignore;
-      num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U;
-   }
-
-   else /* num_chunks_in > 0 */
-   {
-      if (chunk_list == NULL)
-      {
-         /* Prior to 1.6.0 this was silently ignored, now it is an app_error
-          * which can be switched off.
-          */
-         png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list");
-
-         return;
-      }
-
-      num_chunks = (unsigned int)num_chunks_in;
-   }
-
-   old_num_chunks = png_ptr->num_chunk_list;
-   if (png_ptr->chunk_list == NULL)
-      old_num_chunks = 0;
-
-   /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow.
-    */
-   if (num_chunks + old_num_chunks > UINT_MAX/5)
-   {
-      png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks");
-
-      return;
-   }
-
-   /* If these chunks are being reset to the default then no more memory is
-    * required because add_one_chunk above doesn't extend the list if the 'keep'
-    * parameter is the default.
-    */
-   if (keep != 0)
-   {
-      new_list = png_voidcast(png_bytep, png_malloc(png_ptr,
-          5 * (num_chunks + old_num_chunks)));
-
-      if (old_num_chunks > 0)
-         memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
-   }
-
-   else if (old_num_chunks > 0)
-      new_list = png_ptr->chunk_list;
-
-   else
-      new_list = NULL;
-
-   /* Add the new chunks together with each one's handling code.  If the chunk
-    * already exists the code is updated, otherwise the chunk is added to the
-    * end.  (In libpng 1.6.0 order no longer matters because this code enforces
-    * the earlier convention that the last setting is the one that is used.)
-    */
-   if (new_list != NULL)
-   {
-      png_const_bytep inlist;
-      png_bytep outlist;
-      unsigned int i;
-
-      for (i=0; i<num_chunks; ++i)
-      {
-         old_num_chunks = add_one_chunk(new_list, old_num_chunks,
-             chunk_list+5*i, keep);
-      }
-
-      /* Now remove any spurious 'default' entries. */
-      num_chunks = 0;
-      for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5)
-      {
-         if (inlist[4])
-         {
-            if (outlist != inlist)
-               memcpy(outlist, inlist, 5);
-            outlist += 5;
-            ++num_chunks;
-         }
-      }
-
-      /* This means the application has removed all the specialized handling. */
-      if (num_chunks == 0)
-      {
-         if (png_ptr->chunk_list != new_list)
-            png_free(png_ptr, new_list);
-
-         new_list = NULL;
-      }
-   }
-
-   else
-      num_chunks = 0;
-
-   png_ptr->num_chunk_list = num_chunks;
-
-   if (png_ptr->chunk_list != new_list)
-   {
-      if (png_ptr->chunk_list != NULL)
-         png_free(png_ptr, png_ptr->chunk_list);
-
-      png_ptr->chunk_list = new_list;
-   }
-}
-#endif
-
-#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
-void PNGAPI
-png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr,
-    png_user_chunk_ptr read_user_chunk_fn)
-{
-   png_debug(1, "in png_set_read_user_chunk_fn");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->read_user_chunk_fn = read_user_chunk_fn;
-   png_ptr->user_chunk_ptr = user_chunk_ptr;
-}
-#endif
-
-#ifdef PNG_INFO_IMAGE_SUPPORTED
-void PNGAPI
-png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr,
-    png_bytepp row_pointers)
-{
-   png_debug1(1, "in %s storage function", "rows");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   if (info_ptr->row_pointers != NULL &&
-       (info_ptr->row_pointers != row_pointers))
-      png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
-
-   info_ptr->row_pointers = row_pointers;
-
-   if (row_pointers != NULL)
-      info_ptr->valid |= PNG_INFO_IDAT;
-}
-#endif
-
-void PNGAPI
-png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
-{
-   if (png_ptr == NULL)
-      return;
-
-   if (size == 0 || size > PNG_UINT_31_MAX)
-      png_error(png_ptr, "invalid compression buffer size");
-
-#  ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-   if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
-   {
-      png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */
-      return;
-   }
-#  endif
-
-#  ifdef PNG_WRITE_SUPPORTED
-   if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
-   {
-      if (png_ptr->zowner != 0)
-      {
-         png_warning(png_ptr,
-             "Compression buffer size cannot be changed because it is in use");
-
-         return;
-      }
-
-#ifndef __COVERITY__
-      /* Some compilers complain that this is always false.  However, it
-       * can be true when integer overflow happens.
-       */
-      if (size > ZLIB_IO_MAX)
-      {
-         png_warning(png_ptr,
-             "Compression buffer size limited to system maximum");
-         size = ZLIB_IO_MAX; /* must fit */
-      }
-#endif
-
-      if (size < 6)
-      {
-         /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH
-          * if this is permitted.
-          */
-         png_warning(png_ptr,
-             "Compression buffer size cannot be reduced below 6");
-
-         return;
-      }
-
-      if (png_ptr->zbuffer_size != size)
-      {
-         png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
-         png_ptr->zbuffer_size = (uInt)size;
-      }
-   }
-#  endif
-}
-
-void PNGAPI
-png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
-{
-   if (png_ptr != NULL && info_ptr != NULL)
-      info_ptr->valid &= (unsigned int)(~mask);
-}
-
-
-#ifdef PNG_SET_USER_LIMITS_SUPPORTED
-/* This function was added to libpng 1.2.6 */
-void PNGAPI
-png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max,
-    png_uint_32 user_height_max)
-{
-   /* Images with dimensions larger than these limits will be
-    * rejected by png_set_IHDR().  To accept any PNG datastream
-    * regardless of dimensions, set both limits to 0x7fffffff.
-    */
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->user_width_max = user_width_max;
-   png_ptr->user_height_max = user_height_max;
-}
-
-/* This function was added to libpng 1.4.0 */
-void PNGAPI
-png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
-{
-   if (png_ptr != NULL)
-      png_ptr->user_chunk_cache_max = user_chunk_cache_max;
-}
-
-/* This function was added to libpng 1.4.1 */
-void PNGAPI
-png_set_chunk_malloc_max (png_structrp png_ptr,
-    png_alloc_size_t user_chunk_malloc_max)
-{
-   if (png_ptr != NULL)
-      png_ptr->user_chunk_malloc_max = user_chunk_malloc_max;
-}
-#endif /* ?SET_USER_LIMITS */
-
-
-#ifdef PNG_BENIGN_ERRORS_SUPPORTED
-void PNGAPI
-png_set_benign_errors(png_structrp png_ptr, int allowed)
-{
-   png_debug(1, "in png_set_benign_errors");
-
-   /* If allowed is 1, png_benign_error() is treated as a warning.
-    *
-    * If allowed is 0, png_benign_error() is treated as an error (which
-    * is the default behavior if png_set_benign_errors() is not called).
-    */
-
-   if (allowed != 0)
-      png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN |
-         PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN;
-
-   else
-      png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN |
-         PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN);
-}
-#endif /* BENIGN_ERRORS */
-
-#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
-   /* Whether to report invalid palette index; added at libng-1.5.10.
-    * It is possible for an indexed (color-type==3) PNG file to contain
-    * pixels with invalid (out-of-range) indexes if the PLTE chunk has
-    * fewer entries than the image's bit-depth would allow. We recover
-    * from this gracefully by filling any incomplete palette with zeros
-    * (opaque black).  By default, when this occurs libpng will issue
-    * a benign error.  This API can be used to override that behavior.
-    */
-void PNGAPI
-png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
-{
-   png_debug(1, "in png_set_check_for_invalid_index");
-
-   if (allowed > 0)
-      png_ptr->num_palette_max = 0;
-
-   else
-      png_ptr->num_palette_max = -1;
-}
-#endif
-
-#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \
-    defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
-/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
- * and if invalid, correct the keyword rather than discarding the entire
- * chunk.  The PNG 1.0 specification requires keywords 1-79 characters in
- * length, forbids leading or trailing whitespace, multiple internal spaces,
- * and the non-break space (0x80) from ISO 8859-1.  Returns keyword length.
- *
- * The 'new_key' buffer must be 80 characters in size (for the keyword plus a
- * trailing '\0').  If this routine returns 0 then there was no keyword, or a
- * valid one could not be generated, and the caller must png_error.
- */
-png_uint_32 /* PRIVATE */
-png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key)
-{
-#ifdef PNG_WARNINGS_SUPPORTED
-   png_const_charp orig_key = key;
-#endif
-   png_uint_32 key_len = 0;
-   int bad_character = 0;
-   int space = 1;
-
-   png_debug(1, "in png_check_keyword");
-
-   if (key == NULL)
-   {
-      *new_key = 0;
-      return 0;
-   }
-
-   while (*key && key_len < 79)
-   {
-      png_byte ch = (png_byte)*key++;
-
-      if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
-      {
-         *new_key++ = ch; ++key_len; space = 0;
-      }
-
-      else if (space == 0)
-      {
-         /* A space or an invalid character when one wasn't seen immediately
-          * before; output just a space.
-          */
-         *new_key++ = 32; ++key_len; space = 1;
-
-         /* If the character was not a space then it is invalid. */
-         if (ch != 32)
-            bad_character = ch;
-      }
-
-      else if (bad_character == 0)
-         bad_character = ch; /* just skip it, record the first error */
-   }
-
-   if (key_len > 0 && space != 0) /* trailing space */
-   {
-      --key_len; --new_key;
-      if (bad_character == 0)
-         bad_character = 32;
-   }
-
-   /* Terminate the keyword */
-   *new_key = 0;
-
-   if (key_len == 0)
-      return 0;
-
-#ifdef PNG_WARNINGS_SUPPORTED
-   /* Try to only output one warning per keyword: */
-   if (*key != 0) /* keyword too long */
-      png_warning(png_ptr, "keyword truncated");
-
-   else if (bad_character != 0)
-   {
-      PNG_WARNING_PARAMETERS(p)
-
-      png_warning_parameter(p, 1, orig_key);
-      png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character);
-
-      png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'");
-   }
-#else /* !WARNINGS */
-   PNG_UNUSED(png_ptr)
-#endif /* !WARNINGS */
-
-   return key_len;
-}
-#endif /* TEXT || pCAL || iCCP || sPLT */
-#endif /* READ || WRITE */
diff --git a/src/png/libpng/pngstruct.h b/src/png/libpng/pngstruct.h
deleted file mode 100644
index d83f97125..000000000
--- a/src/png/libpng/pngstruct.h
+++ /dev/null
@@ -1,483 +0,0 @@
-
-/* pngstruct.h - header file for PNG reference library
- *
- * Last changed in libpng 1.6.32 [August 24, 2017]
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-/* The structure that holds the information to read and write PNG files.
- * The only people who need to care about what is inside of this are the
- * people who will be modifying the library for their own special needs.
- * It should NOT be accessed directly by an application.
- */
-
-#ifndef PNGSTRUCT_H
-#define PNGSTRUCT_H
-/* zlib.h defines the structure z_stream, an instance of which is included
- * in this structure and is required for decompressing the LZ compressed
- * data in PNG files.
- */
-#ifndef ZLIB_CONST
-   /* We must ensure that zlib uses 'const' in declarations. */
-#  define ZLIB_CONST
-#endif
-#include "zlib.h"
-#ifdef const
-   /* zlib.h sometimes #defines const to nothing, undo this. */
-#  undef const
-#endif
-
-/* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility
- * with older builds.
- */
-#if ZLIB_VERNUM < 0x1260
-#  define PNGZ_MSG_CAST(s) png_constcast(char*,s)
-#  define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b)
-#else
-#  define PNGZ_MSG_CAST(s) (s)
-#  define PNGZ_INPUT_CAST(b) (b)
-#endif
-
-/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
- * can handle at once.  This type need be no larger than 16 bits (so maximum of
- * 65535), this define allows us to discover how big it is, but limited by the
- * maximuum for png_size_t.  The value can be overriden in a library build
- * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
- * lower value (e.g. 255 works).  A lower value may help memory usage (slightly)
- * and may even improve performance on some systems (and degrade it on others.)
- */
-#ifndef ZLIB_IO_MAX
-#  define ZLIB_IO_MAX ((uInt)-1)
-#endif
-
-#ifdef PNG_WRITE_SUPPORTED
-/* The type of a compression buffer list used by the write code. */
-typedef struct png_compression_buffer
-{
-   struct png_compression_buffer *next;
-   png_byte                       output[1]; /* actually zbuf_size */
-} png_compression_buffer, *png_compression_bufferp;
-
-#define PNG_COMPRESSION_BUFFER_SIZE(pp)\
-   (offsetof(png_compression_buffer, output) + (pp)->zbuffer_size)
-#endif
-
-/* Colorspace support; structures used in png_struct, png_info and in internal
- * functions to hold and communicate information about the color space.
- *
- * PNG_COLORSPACE_SUPPORTED is only required if the application will perform
- * colorspace corrections, otherwise all the colorspace information can be
- * skipped and the size of libpng can be reduced (significantly) by compiling
- * out the colorspace support.
- */
-#ifdef PNG_COLORSPACE_SUPPORTED
-/* The chromaticities of the red, green and blue colorants and the chromaticity
- * of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)).
- */
-typedef struct png_xy
-{
-   png_fixed_point redx, redy;
-   png_fixed_point greenx, greeny;
-   png_fixed_point bluex, bluey;
-   png_fixed_point whitex, whitey;
-} png_xy;
-
-/* The same data as above but encoded as CIE XYZ values.  When this data comes
- * from chromaticities the sum of the Y values is assumed to be 1.0
- */
-typedef struct png_XYZ
-{
-   png_fixed_point red_X, red_Y, red_Z;
-   png_fixed_point green_X, green_Y, green_Z;
-   png_fixed_point blue_X, blue_Y, blue_Z;
-} png_XYZ;
-#endif /* COLORSPACE */
-
-#if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
-/* A colorspace is all the above plus, potentially, profile information;
- * however at present libpng does not use the profile internally so it is only
- * stored in the png_info struct (if iCCP is supported.)  The rendering intent
- * is retained here and is checked.
- *
- * The file gamma encoding information is also stored here and gamma correction
- * is done by libpng, whereas color correction must currently be done by the
- * application.
- */
-typedef struct png_colorspace
-{
-#ifdef PNG_GAMMA_SUPPORTED
-   png_fixed_point gamma;        /* File gamma */
-#endif
-
-#ifdef PNG_COLORSPACE_SUPPORTED
-   png_xy      end_points_xy;    /* End points as chromaticities */
-   png_XYZ     end_points_XYZ;   /* End points as CIE XYZ colorant values */
-   png_uint_16 rendering_intent; /* Rendering intent of a profile */
-#endif
-
-   /* Flags are always defined to simplify the code. */
-   png_uint_16 flags;            /* As defined below */
-} png_colorspace, * PNG_RESTRICT png_colorspacerp;
-
-typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp;
-
-/* General flags for the 'flags' field */
-#define PNG_COLORSPACE_HAVE_GAMMA           0x0001
-#define PNG_COLORSPACE_HAVE_ENDPOINTS       0x0002
-#define PNG_COLORSPACE_HAVE_INTENT          0x0004
-#define PNG_COLORSPACE_FROM_gAMA            0x0008
-#define PNG_COLORSPACE_FROM_cHRM            0x0010
-#define PNG_COLORSPACE_FROM_sRGB            0x0020
-#define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040
-#define PNG_COLORSPACE_MATCHES_sRGB         0x0080 /* exact match on profile */
-#define PNG_COLORSPACE_INVALID              0x8000
-#define PNG_COLORSPACE_CANCEL(flags)        (0xffff ^ (flags))
-#endif /* COLORSPACE || GAMMA */
-
-struct png_struct_def
-{
-#ifdef PNG_SETJMP_SUPPORTED
-   jmp_buf jmp_buf_local;     /* New name in 1.6.0 for jmp_buf in png_struct */
-   png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */
-   jmp_buf *jmp_buf_ptr;      /* passed to longjmp_fn */
-   size_t jmp_buf_size;       /* size of the above, if allocated */
-#endif
-   png_error_ptr error_fn;    /* function for printing errors and aborting */
-#ifdef PNG_WARNINGS_SUPPORTED
-   png_error_ptr warning_fn;  /* function for printing warnings */
-#endif
-   png_voidp error_ptr;       /* user supplied struct for error functions */
-   png_rw_ptr write_data_fn;  /* function for writing output data */
-   png_rw_ptr read_data_fn;   /* function for reading input data */
-   png_voidp io_ptr;          /* ptr to application struct for I/O functions */
-
-#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
-   png_user_transform_ptr read_user_transform_fn; /* user read transform */
-#endif
-
-#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
-   png_user_transform_ptr write_user_transform_fn; /* user write transform */
-#endif
-
-/* These were added in libpng-1.0.2 */
-#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-   png_voidp user_transform_ptr; /* user supplied struct for user transform */
-   png_byte user_transform_depth;    /* bit depth of user transformed pixels */
-   png_byte user_transform_channels; /* channels in user transformed pixels */
-#endif
-#endif
-
-   png_uint_32 mode;          /* tells us where we are in the PNG file */
-   png_uint_32 flags;         /* flags indicating various things to libpng */
-   png_uint_32 transformations; /* which transformations to perform */
-
-   png_uint_32 zowner;        /* ID (chunk type) of zstream owner, 0 if none */
-   z_stream    zstream;       /* decompression structure */
-
-#ifdef PNG_WRITE_SUPPORTED
-   png_compression_bufferp zbuffer_list; /* Created on demand during write */
-   uInt                    zbuffer_size; /* size of the actual buffer */
-
-   int zlib_level;            /* holds zlib compression level */
-   int zlib_method;           /* holds zlib compression method */
-   int zlib_window_bits;      /* holds zlib compression window bits */
-   int zlib_mem_level;        /* holds zlib compression memory level */
-   int zlib_strategy;         /* holds zlib compression strategy */
-#endif
-/* Added at libpng 1.5.4 */
-#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
-   int zlib_text_level;            /* holds zlib compression level */
-   int zlib_text_method;           /* holds zlib compression method */
-   int zlib_text_window_bits;      /* holds zlib compression window bits */
-   int zlib_text_mem_level;        /* holds zlib compression memory level */
-   int zlib_text_strategy;         /* holds zlib compression strategy */
-#endif
-/* End of material added at libpng 1.5.4 */
-/* Added at libpng 1.6.0 */
-#ifdef PNG_WRITE_SUPPORTED
-   int zlib_set_level;        /* Actual values set into the zstream on write */
-   int zlib_set_method;
-   int zlib_set_window_bits;
-   int zlib_set_mem_level;
-   int zlib_set_strategy;
-#endif
-
-   png_uint_32 width;         /* width of image in pixels */
-   png_uint_32 height;        /* height of image in pixels */
-   png_uint_32 num_rows;      /* number of rows in current pass */
-   png_uint_32 usr_width;     /* width of row at start of write */
-   png_size_t rowbytes;       /* size of row in bytes */
-   png_uint_32 iwidth;        /* width of current interlaced row in pixels */
-   png_uint_32 row_number;    /* current row in interlace pass */
-   png_uint_32 chunk_name;    /* PNG_CHUNK() id of current chunk */
-   png_bytep prev_row;        /* buffer to save previous (unfiltered) row.
-                               * While reading this is a pointer into
-                               * big_prev_row; while writing it is separately
-                               * allocated if needed.
-                               */
-   png_bytep row_buf;         /* buffer to save current (unfiltered) row.
-                               * While reading, this is a pointer into
-                               * big_row_buf; while writing it is separately
-                               * allocated.
-                               */
-#ifdef PNG_WRITE_FILTER_SUPPORTED
-   png_bytep try_row;    /* buffer to save trial row when filtering */
-   png_bytep tst_row;    /* buffer to save best trial row when filtering */
-#endif
-   png_size_t info_rowbytes;  /* Added in 1.5.4: cache of updated row bytes */
-
-   png_uint_32 idat_size;     /* current IDAT size for read */
-   png_uint_32 crc;           /* current chunk CRC value */
-   png_colorp palette;        /* palette from the input file */
-   png_uint_16 num_palette;   /* number of color entries in palette */
-
-/* Added at libpng-1.5.10 */
-#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
-   int num_palette_max;       /* maximum palette index found in IDAT */
-#endif
-
-   png_uint_16 num_trans;     /* number of transparency values */
-   png_byte compression;      /* file compression type (always 0) */
-   png_byte filter;           /* file filter type (always 0) */
-   png_byte interlaced;       /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
-   png_byte pass;             /* current interlace pass (0 - 6) */
-   png_byte do_filter;        /* row filter flags (see PNG_FILTER_ in png.h ) */
-   png_byte color_type;       /* color type of file */
-   png_byte bit_depth;        /* bit depth of file */
-   png_byte usr_bit_depth;    /* bit depth of users row: write only */
-   png_byte pixel_depth;      /* number of bits per pixel */
-   png_byte channels;         /* number of channels in file */
-#ifdef PNG_WRITE_SUPPORTED
-   png_byte usr_channels;     /* channels at start of write: write only */
-#endif
-   png_byte sig_bytes;        /* magic bytes read/written from start of file */
-   png_byte maximum_pixel_depth;
-                              /* pixel depth used for the row buffers */
-   png_byte transformed_pixel_depth;
-                              /* pixel depth after read/write transforms */
-#if ZLIB_VERNUM >= 0x1240
-   png_byte zstream_start;    /* at start of an input zlib stream */
-#endif /* Zlib >= 1.2.4 */
-#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
-   png_uint_16 filler;           /* filler bytes for pixel expansion */
-#endif
-
-#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
-   defined(PNG_READ_ALPHA_MODE_SUPPORTED)
-   png_byte background_gamma_type;
-   png_fixed_point background_gamma;
-   png_color_16 background;   /* background color in screen gamma space */
-#ifdef PNG_READ_GAMMA_SUPPORTED
-   png_color_16 background_1; /* background normalized to gamma 1.0 */
-#endif
-#endif /* bKGD */
-
-#ifdef PNG_WRITE_FLUSH_SUPPORTED
-   png_flush_ptr output_flush_fn; /* Function for flushing output */
-   png_uint_32 flush_dist;    /* how many rows apart to flush, 0 - no flush */
-   png_uint_32 flush_rows;    /* number of rows written since last flush */
-#endif
-
-#ifdef PNG_READ_GAMMA_SUPPORTED
-   int gamma_shift;      /* number of "insignificant" bits in 16-bit gamma */
-   png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */
-
-   png_bytep gamma_table;     /* gamma table for 8-bit depth files */
-   png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
-#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
-   defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
-   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-   png_bytep gamma_from_1;    /* converts from 1.0 to screen */
-   png_bytep gamma_to_1;      /* converts from file to 1.0 */
-   png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
-   png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
-#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
-#endif
-
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
-   png_color_8 sig_bit;       /* significant bits in each available channel */
-#endif
-
-#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
-   png_color_8 shift;         /* shift for significant bit tranformation */
-#endif
-
-#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
- || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   png_bytep trans_alpha;           /* alpha values for paletted files */
-   png_color_16 trans_color;  /* transparent color for non-paletted files */
-#endif
-
-   png_read_status_ptr read_row_fn;   /* called after each row is decoded */
-   png_write_status_ptr write_row_fn; /* called after each row is encoded */
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-   png_progressive_info_ptr info_fn; /* called after header data fully read */
-   png_progressive_row_ptr row_fn;   /* called after a prog. row is decoded */
-   png_progressive_end_ptr end_fn;   /* called after image is complete */
-   png_bytep save_buffer_ptr;        /* current location in save_buffer */
-   png_bytep save_buffer;            /* buffer for previously read data */
-   png_bytep current_buffer_ptr;     /* current location in current_buffer */
-   png_bytep current_buffer;         /* buffer for recently used data */
-   png_uint_32 push_length;          /* size of current input chunk */
-   png_uint_32 skip_length;          /* bytes to skip in input data */
-   png_size_t save_buffer_size;      /* amount of data now in save_buffer */
-   png_size_t save_buffer_max;       /* total size of save_buffer */
-   png_size_t buffer_size;           /* total amount of available input data */
-   png_size_t current_buffer_size;   /* amount of data now in current_buffer */
-   int process_mode;                 /* what push library is currently doing */
-   int cur_palette;                  /* current push library palette index */
-
-#endif /* PROGRESSIVE_READ */
-
-#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
-/* For the Borland special 64K segment handler */
-   png_bytepp offset_table_ptr;
-   png_bytep offset_table;
-   png_uint_16 offset_table_number;
-   png_uint_16 offset_table_count;
-   png_uint_16 offset_table_count_free;
-#endif
-
-#ifdef PNG_READ_QUANTIZE_SUPPORTED
-   png_bytep palette_lookup; /* lookup table for quantizing */
-   png_bytep quantize_index; /* index translation for palette files */
-#endif
-
-/* Options */
-#ifdef PNG_SET_OPTION_SUPPORTED
-   png_uint_32 options;           /* On/off state (up to 16 options) */
-#endif
-
-#if PNG_LIBPNG_VER < 10700
-/* To do: remove this from libpng-1.7 */
-#ifdef PNG_TIME_RFC1123_SUPPORTED
-   char time_buffer[29]; /* String to hold RFC 1123 time text */
-#endif
-#endif
-
-/* New members added in libpng-1.0.6 */
-
-   png_uint_32 free_me;    /* flags items libpng is responsible for freeing */
-
-#ifdef PNG_USER_CHUNKS_SUPPORTED
-   png_voidp user_chunk_ptr;
-#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
-   png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
-#endif
-#endif
-
-#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
-   int          unknown_default; /* As PNG_HANDLE_* */
-   unsigned int num_chunk_list;  /* Number of entries in the list */
-   png_bytep    chunk_list;      /* List of png_byte[5]; the textual chunk name
-                                  * followed by a PNG_HANDLE_* byte */
-#endif
-
-/* New members added in libpng-1.0.3 */
-#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
-   png_byte rgb_to_gray_status;
-   /* Added in libpng 1.5.5 to record setting of coefficients: */
-   png_byte rgb_to_gray_coefficients_set;
-   /* These were changed from png_byte in libpng-1.0.6 */
-   png_uint_16 rgb_to_gray_red_coeff;
-   png_uint_16 rgb_to_gray_green_coeff;
-   /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */
-#endif
-
-/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
-#if defined(PNG_MNG_FEATURES_SUPPORTED)
-/* Changed from png_byte to png_uint_32 at version 1.2.0 */
-   png_uint_32 mng_features_permitted;
-#endif
-
-/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-   png_byte filter_type;
-#endif
-
-/* New members added in libpng-1.2.0 */
-
-/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
-#ifdef PNG_USER_MEM_SUPPORTED
-   png_voidp mem_ptr;             /* user supplied struct for mem functions */
-   png_malloc_ptr malloc_fn;      /* function for allocating memory */
-   png_free_ptr free_fn;          /* function for freeing memory */
-#endif
-
-/* New member added in libpng-1.0.13 and 1.2.0 */
-   png_bytep big_row_buf;         /* buffer to save current (unfiltered) row */
-
-#ifdef PNG_READ_QUANTIZE_SUPPORTED
-/* The following three members were added at version 1.0.14 and 1.2.4 */
-   png_bytep quantize_sort;          /* working sort array */
-   png_bytep index_to_palette;       /* where the original index currently is
-                                        in the palette */
-   png_bytep palette_to_index;       /* which original index points to this
-                                         palette color */
-#endif
-
-/* New members added in libpng-1.0.16 and 1.2.6 */
-   png_byte compression_type;
-
-#ifdef PNG_USER_LIMITS_SUPPORTED
-   png_uint_32 user_width_max;
-   png_uint_32 user_height_max;
-
-   /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
-    * chunks that can be stored (0 means unlimited).
-    */
-   png_uint_32 user_chunk_cache_max;
-
-   /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
-    * can occupy when decompressed.  0 means unlimited.
-    */
-   png_alloc_size_t user_chunk_malloc_max;
-#endif
-
-/* New member added in libpng-1.0.25 and 1.2.17 */
-#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
-   /* Temporary storage for unknown chunk that the library doesn't recognize,
-    * used while reading the chunk.
-    */
-   png_unknown_chunk unknown_chunk;
-#endif
-
-/* New member added in libpng-1.2.26 */
-  png_size_t old_big_row_buf_size;
-
-#ifdef PNG_READ_SUPPORTED
-/* New member added in libpng-1.2.30 */
-  png_bytep        read_buffer;      /* buffer for reading chunk data */
-  png_alloc_size_t read_buffer_size; /* current size of the buffer */
-#endif
-#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
-  uInt             IDAT_read_size;   /* limit on read buffer size for IDAT */
-#endif
-
-#ifdef PNG_IO_STATE_SUPPORTED
-/* New member added in libpng-1.4.0 */
-   png_uint_32 io_state;
-#endif
-
-/* New member added in libpng-1.5.6 */
-   png_bytep big_prev_row;
-
-/* New member added in libpng-1.5.7 */
-   void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info,
-      png_bytep row, png_const_bytep prev_row);
-
-#ifdef PNG_READ_SUPPORTED
-#if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
-   png_colorspace   colorspace;
-#endif
-#endif
-};
-#endif /* PNGSTRUCT_H */
diff --git a/src/png/libpng/pngtest.c b/src/png/libpng/pngtest.c
deleted file mode 100644
index 9d5075791..000000000
--- a/src/png/libpng/pngtest.c
+++ /dev/null
@@ -1,2156 +0,0 @@
-
-/* pngtest.c - a simple test program to test libpng
- *
- * Last changed in libpng 1.6.32 [August 24, 2017]
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * This program reads in a PNG image, writes it out again, and then
- * compares the two files.  If the files are identical, this shows that
- * the basic chunk handling, filtering, and (de)compression code is working
- * properly.  It does not currently test all of the transforms, although
- * it probably should.
- *
- * The program will report "FAIL" in certain legitimate cases:
- * 1) when the compression level or filter selection method is changed.
- * 2) when the maximum IDAT size (PNG_ZBUF_SIZE in pngconf.h) is not 8192.
- * 3) unknown unsafe-to-copy ancillary chunks or unknown critical chunks
- *    exist in the input file.
- * 4) others not listed here...
- * In these cases, it is best to check with another tool such as "pngcheck"
- * to see what the differences between the two files are.
- *
- * If a filename is given on the command-line, then this file is used
- * for the input, rather than the default "pngtest.png".  This allows
- * testing a wide variety of files easily.  You can also test a number
- * of files at once by typing "pngtest -m file1.png file2.png ..."
- */
-
-#define _POSIX_SOURCE 1
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-/* Defined so I can write to a file on gui/windowing platforms */
-/*  #define STDERR stderr  */
-#define STDERR stdout   /* For DOS */
-
-#include "png.h"
-
-/* Known chunks that exist in pngtest.png must be supported or pngtest will fail
- * simply as a result of re-ordering them.  This may be fixed in 1.7
- *
- * pngtest allocates a single row buffer for each row and overwrites it,
- * therefore if the write side doesn't support the writing of interlaced images
- * nothing can be done for an interlaced image (and the code below will fail
- * horribly trying to write extra data after writing garbage).
- */
-#if defined PNG_READ_SUPPORTED && /* else nothing can be done */\
-   defined PNG_READ_bKGD_SUPPORTED &&\
-   defined PNG_READ_cHRM_SUPPORTED &&\
-   defined PNG_READ_gAMA_SUPPORTED &&\
-   defined PNG_READ_oFFs_SUPPORTED &&\
-   defined PNG_READ_pCAL_SUPPORTED &&\
-   defined PNG_READ_pHYs_SUPPORTED &&\
-   defined PNG_READ_sBIT_SUPPORTED &&\
-   defined PNG_READ_sCAL_SUPPORTED &&\
-   defined PNG_READ_sRGB_SUPPORTED &&\
-   defined PNG_READ_sPLT_SUPPORTED &&\
-   defined PNG_READ_tEXt_SUPPORTED &&\
-   defined PNG_READ_tIME_SUPPORTED &&\
-   defined PNG_READ_zTXt_SUPPORTED &&\
-   (defined PNG_WRITE_INTERLACING_SUPPORTED || PNG_LIBPNG_VER >= 10700)
-
-#ifdef PNG_ZLIB_HEADER
-#  include PNG_ZLIB_HEADER /* defined by pnglibconf.h from 1.7 */
-#else
-#  include "zlib.h"
-#endif
-
-/* Copied from pngpriv.h but only used in error messages below. */
-#ifndef PNG_ZBUF_SIZE
-#  define PNG_ZBUF_SIZE 8192
-#endif
-#define FCLOSE(file) fclose(file)
-
-#ifndef PNG_STDIO_SUPPORTED
-typedef FILE                * png_FILE_p;
-#endif
-
-/* Makes pngtest verbose so we can find problems. */
-#ifndef PNG_DEBUG
-#  define PNG_DEBUG 0
-#endif
-
-#if PNG_DEBUG > 1
-#  define pngtest_debug(m)        ((void)fprintf(stderr, m "\n"))
-#  define pngtest_debug1(m,p1)    ((void)fprintf(stderr, m "\n", p1))
-#  define pngtest_debug2(m,p1,p2) ((void)fprintf(stderr, m "\n", p1, p2))
-#else
-#  define pngtest_debug(m)        ((void)0)
-#  define pngtest_debug1(m,p1)    ((void)0)
-#  define pngtest_debug2(m,p1,p2) ((void)0)
-#endif
-
-#if !PNG_DEBUG
-#  define SINGLE_ROWBUF_ALLOC  /* Makes buffer overruns easier to nail */
-#endif
-
-#ifndef PNG_UNUSED
-#  define PNG_UNUSED(param) (void)param;
-#endif
-
-/* Turn on CPU timing
-#define PNGTEST_TIMING
-*/
-
-#ifndef PNG_FLOATING_POINT_SUPPORTED
-#undef PNGTEST_TIMING
-#endif
-
-#ifdef PNGTEST_TIMING
-static float t_start, t_stop, t_decode, t_encode, t_misc;
-#include <time.h>
-#endif
-
-#ifdef PNG_TIME_RFC1123_SUPPORTED
-#define PNG_tIME_STRING_LENGTH 29
-static int tIME_chunk_present = 0;
-static char tIME_string[PNG_tIME_STRING_LENGTH] = "tIME chunk is not present";
-
-#if PNG_LIBPNG_VER < 10619
-#define png_convert_to_rfc1123_buffer(ts, t) tIME_to_str(read_ptr, ts, t)
-
-static int
-tIME_to_str(png_structp png_ptr, png_charp ts, png_const_timep t)
-{
-   png_const_charp str = png_convert_to_rfc1123(png_ptr, t);
-
-   if (str == NULL)
-       return 0;
-
-   strcpy(ts, str);
-   return 1;
-}
-#endif /* older libpng */
-#endif
-
-static int verbose = 0;
-static int strict = 0;
-static int relaxed = 0;
-static int xfail = 0;
-static int unsupported_chunks = 0; /* chunk unsupported by libpng in input */
-static int error_count = 0; /* count calls to png_error */
-static int warning_count = 0; /* count calls to png_warning */
-
-/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
-#ifndef png_jmpbuf
-#  define png_jmpbuf(png_ptr) png_ptr->jmpbuf
-#endif
-
-/* Defines for unknown chunk handling if required. */
-#ifndef PNG_HANDLE_CHUNK_ALWAYS
-#  define PNG_HANDLE_CHUNK_ALWAYS       3
-#endif
-#ifndef PNG_HANDLE_CHUNK_IF_SAFE
-#  define PNG_HANDLE_CHUNK_IF_SAFE      2
-#endif
-
-/* Utility to save typing/errors, the argument must be a name */
-#define MEMZERO(var) ((void)memset(&var, 0, sizeof var))
-
-/* Example of using row callbacks to make a simple progress meter */
-static int status_pass = 1;
-static int status_dots_requested = 0;
-static int status_dots = 1;
-
-static void PNGCBAPI
-read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
-{
-   if (png_ptr == NULL || row_number > PNG_UINT_31_MAX)
-      return;
-
-   if (status_pass != pass)
-   {
-      fprintf(stdout, "\n Pass %d: ", pass);
-      status_pass = pass;
-      status_dots = 31;
-   }
-
-   status_dots--;
-
-   if (status_dots == 0)
-   {
-      fprintf(stdout, "\n         ");
-      status_dots=30;
-   }
-
-   fprintf(stdout, "r");
-}
-
-#ifdef PNG_WRITE_SUPPORTED
-static void PNGCBAPI
-write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
-{
-   if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7)
-      return;
-
-   fprintf(stdout, "w");
-}
-#endif
-
-
-#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
-/* Example of using a user transform callback (doesn't do anything at present).
- */
-static void PNGCBAPI
-read_user_callback(png_structp png_ptr, png_row_infop row_info, png_bytep data)
-{
-   PNG_UNUSED(png_ptr)
-   PNG_UNUSED(row_info)
-   PNG_UNUSED(data)
-}
-#endif
-
-#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
-/* Example of using user transform callback (we don't transform anything,
- * but merely count the zero samples)
- */
-
-static png_uint_32 zero_samples;
-
-static void PNGCBAPI
-count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
-{
-   png_bytep dp = data;
-   if (png_ptr == NULL)
-      return;
-
-   /* Contents of row_info:
-    *  png_uint_32 width      width of row
-    *  png_uint_32 rowbytes   number of bytes in row
-    *  png_byte color_type    color type of pixels
-    *  png_byte bit_depth     bit depth of samples
-    *  png_byte channels      number of channels (1-4)
-    *  png_byte pixel_depth   bits per pixel (depth*channels)
-    */
-
-   /* Counts the number of zero samples (or zero pixels if color_type is 3 */
-
-   if (row_info->color_type == 0 || row_info->color_type == 3)
-   {
-      int pos = 0;
-      png_uint_32 n, nstop;
-
-      for (n = 0, nstop=row_info->width; n<nstop; n++)
-      {
-         if (row_info->bit_depth == 1)
-         {
-            if (((*dp << pos++ ) & 0x80) == 0)
-               zero_samples++;
-
-            if (pos == 8)
-            {
-               pos = 0;
-               dp++;
-            }
-         }
-
-         if (row_info->bit_depth == 2)
-         {
-            if (((*dp << (pos+=2)) & 0xc0) == 0)
-               zero_samples++;
-
-            if (pos == 8)
-            {
-               pos = 0;
-               dp++;
-            }
-         }
-
-         if (row_info->bit_depth == 4)
-         {
-            if (((*dp << (pos+=4)) & 0xf0) == 0)
-               zero_samples++;
-
-            if (pos == 8)
-            {
-               pos = 0;
-               dp++;
-            }
-         }
-
-         if (row_info->bit_depth == 8)
-            if (*dp++ == 0)
-               zero_samples++;
-
-         if (row_info->bit_depth == 16)
-         {
-            if ((*dp | *(dp+1)) == 0)
-               zero_samples++;
-            dp+=2;
-         }
-      }
-   }
-   else /* Other color types */
-   {
-      png_uint_32 n, nstop;
-      int channel;
-      int color_channels = row_info->channels;
-      if (row_info->color_type > 3)
-         color_channels--;
-
-      for (n = 0, nstop=row_info->width; n<nstop; n++)
-      {
-         for (channel = 0; channel < color_channels; channel++)
-         {
-            if (row_info->bit_depth == 8)
-               if (*dp++ == 0)
-                  zero_samples++;
-
-            if (row_info->bit_depth == 16)
-            {
-               if ((*dp | *(dp+1)) == 0)
-                  zero_samples++;
-
-               dp+=2;
-            }
-         }
-         if (row_info->color_type > 3)
-         {
-            dp++;
-            if (row_info->bit_depth == 16)
-               dp++;
-         }
-      }
-   }
-}
-#endif /* WRITE_USER_TRANSFORM */
-
-#ifndef PNG_STDIO_SUPPORTED
-/* START of code to validate stdio-free compilation */
-/* These copies of the default read/write functions come from pngrio.c and
- * pngwio.c.  They allow "don't include stdio" testing of the library.
- * This is the function that does the actual reading of data.  If you are
- * not reading from a standard C stream, you should create a replacement
- * read_data function and use it at run time with png_set_read_fn(), rather
- * than changing the library.
- */
-
-#ifdef PNG_IO_STATE_SUPPORTED
-void
-pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
-    png_uint_32 io_op);
-void
-pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
-    png_uint_32 io_op)
-{
-   png_uint_32 io_state = png_get_io_state(png_ptr);
-   int err = 0;
-
-   /* Check if the current operation (reading / writing) is as expected. */
-   if ((io_state & PNG_IO_MASK_OP) != io_op)
-      png_error(png_ptr, "Incorrect operation in I/O state");
-
-   /* Check if the buffer size specific to the current location
-    * (file signature / header / data / crc) is as expected.
-    */
-   switch (io_state & PNG_IO_MASK_LOC)
-   {
-   case PNG_IO_SIGNATURE:
-      if (data_length > 8)
-         err = 1;
-      break;
-   case PNG_IO_CHUNK_HDR:
-      if (data_length != 8)
-         err = 1;
-      break;
-   case PNG_IO_CHUNK_DATA:
-      break;  /* no restrictions here */
-   case PNG_IO_CHUNK_CRC:
-      if (data_length != 4)
-         err = 1;
-      break;
-   default:
-      err = 1;  /* uninitialized */
-   }
-   if (err != 0)
-      png_error(png_ptr, "Bad I/O state or buffer size");
-}
-#endif
-
-static void PNGCBAPI
-pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
-{
-   png_size_t check = 0;
-   png_voidp io_ptr;
-
-   /* fread() returns 0 on error, so it is OK to store this in a png_size_t
-    * instead of an int, which is what fread() actually returns.
-    */
-   io_ptr = png_get_io_ptr(png_ptr);
-   if (io_ptr != NULL)
-   {
-      check = fread(data, 1, length, (png_FILE_p)io_ptr);
-   }
-
-   if (check != length)
-   {
-      png_error(png_ptr, "Read Error");
-   }
-
-#ifdef PNG_IO_STATE_SUPPORTED
-   pngtest_check_io_state(png_ptr, length, PNG_IO_READING);
-#endif
-}
-
-#ifdef PNG_WRITE_FLUSH_SUPPORTED
-static void PNGCBAPI
-pngtest_flush(png_structp png_ptr)
-{
-   /* Do nothing; fflush() is said to be just a waste of energy. */
-   PNG_UNUSED(png_ptr)   /* Stifle compiler warning */
-}
-#endif
-
-/* This is the function that does the actual writing of data.  If you are
- * not writing to a standard C stream, you should create a replacement
- * write_data function and use it at run time with png_set_write_fn(), rather
- * than changing the library.
- */
-static void PNGCBAPI
-pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
-{
-   png_size_t check;
-
-   check = fwrite(data, 1, length, (png_FILE_p)png_get_io_ptr(png_ptr));
-
-   if (check != length)
-   {
-      png_error(png_ptr, "Write Error");
-   }
-
-#ifdef PNG_IO_STATE_SUPPORTED
-   pngtest_check_io_state(png_ptr, length, PNG_IO_WRITING);
-#endif
-}
-#endif /* !STDIO */
-
-/* This function is called when there is a warning, but the library thinks
- * it can continue anyway.  Replacement functions don't have to do anything
- * here if you don't want to.  In the default configuration, png_ptr is
- * not used, but it is passed in case it may be useful.
- */
-typedef struct
-{
-   PNG_CONST char *file_name;
-}  pngtest_error_parameters;
-
-static void PNGCBAPI
-pngtest_warning(png_structp png_ptr, png_const_charp message)
-{
-   PNG_CONST char *name = "UNKNOWN (ERROR!)";
-   pngtest_error_parameters *test =
-      (pngtest_error_parameters*)png_get_error_ptr(png_ptr);
-
-   ++warning_count;
-
-   if (test != NULL && test->file_name != NULL)
-      name = test->file_name;
-
-   fprintf(STDERR, "\n%s: libpng warning: %s\n", name, message);
-}
-
-/* This is the default error handling function.  Note that replacements for
- * this function MUST NOT RETURN, or the program will likely crash.  This
- * function is used by default, or if the program supplies NULL for the
- * error function pointer in png_set_error_fn().
- */
-static void PNGCBAPI
-pngtest_error(png_structp png_ptr, png_const_charp message)
-{
-   ++error_count;
-
-   pngtest_warning(png_ptr, message);
-   /* We can return because png_error calls the default handler, which is
-    * actually OK in this case.
-    */
-}
-
-/* END of code to validate stdio-free compilation */
-
-/* START of code to validate memory allocation and deallocation */
-#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
-
-/* Allocate memory.  For reasonable files, size should never exceed
- * 64K.  However, zlib may allocate more than 64K if you don't tell
- * it not to.  See zconf.h and png.h for more information.  zlib does
- * need to allocate exactly 64K, so whatever you call here must
- * have the ability to do that.
- *
- * This piece of code can be compiled to validate max 64K allocations
- * by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K.
- */
-typedef struct memory_information
-{
-   png_alloc_size_t          size;
-   png_voidp                 pointer;
-   struct memory_information *next;
-} memory_information;
-typedef memory_information *memory_infop;
-
-static memory_infop pinformation = NULL;
-static int current_allocation = 0;
-static int maximum_allocation = 0;
-static int total_allocation = 0;
-static int num_allocations = 0;
-
-png_voidp PNGCBAPI png_debug_malloc PNGARG((png_structp png_ptr,
-    png_alloc_size_t size));
-void PNGCBAPI png_debug_free PNGARG((png_structp png_ptr, png_voidp ptr));
-
-png_voidp
-PNGCBAPI png_debug_malloc(png_structp png_ptr, png_alloc_size_t size)
-{
-
-   /* png_malloc has already tested for NULL; png_create_struct calls
-    * png_debug_malloc directly, with png_ptr == NULL which is OK
-    */
-
-   if (size == 0)
-      return (NULL);
-
-   /* This calls the library allocator twice, once to get the requested
-      buffer and once to get a new free list entry. */
-   {
-      /* Disable malloc_fn and free_fn */
-      memory_infop pinfo;
-      png_set_mem_fn(png_ptr, NULL, NULL, NULL);
-      pinfo = (memory_infop)png_malloc(png_ptr,
-          (sizeof *pinfo));
-      pinfo->size = size;
-      current_allocation += size;
-      total_allocation += size;
-      num_allocations ++;
-
-      if (current_allocation > maximum_allocation)
-         maximum_allocation = current_allocation;
-
-      pinfo->pointer = png_malloc(png_ptr, size);
-      /* Restore malloc_fn and free_fn */
-
-      png_set_mem_fn(png_ptr,
-          NULL, png_debug_malloc, png_debug_free);
-
-      if (size != 0 && pinfo->pointer == NULL)
-      {
-         current_allocation -= size;
-         total_allocation -= size;
-         png_error(png_ptr,
-           "out of memory in pngtest->png_debug_malloc");
-      }
-
-      pinfo->next = pinformation;
-      pinformation = pinfo;
-      /* Make sure the caller isn't assuming zeroed memory. */
-      memset(pinfo->pointer, 0xdd, pinfo->size);
-
-      if (verbose != 0)
-         printf("png_malloc %lu bytes at %p\n", (unsigned long)size,
-             pinfo->pointer);
-
-      return (png_voidp)(pinfo->pointer);
-   }
-}
-
-/* Free a pointer.  It is removed from the list at the same time. */
-void PNGCBAPI
-png_debug_free(png_structp png_ptr, png_voidp ptr)
-{
-   if (png_ptr == NULL)
-      fprintf(STDERR, "NULL pointer to png_debug_free.\n");
-
-   if (ptr == 0)
-   {
-#if 0 /* This happens all the time. */
-      fprintf(STDERR, "WARNING: freeing NULL pointer\n");
-#endif
-      return;
-   }
-
-   /* Unlink the element from the list. */
-   if (pinformation != NULL)
-   {
-      memory_infop *ppinfo = &pinformation;
-
-      for (;;)
-      {
-         memory_infop pinfo = *ppinfo;
-
-         if (pinfo->pointer == ptr)
-         {
-            *ppinfo = pinfo->next;
-            current_allocation -= pinfo->size;
-            if (current_allocation < 0)
-               fprintf(STDERR, "Duplicate free of memory\n");
-            /* We must free the list element too, but first kill
-               the memory that is to be freed. */
-            memset(ptr, 0x55, pinfo->size);
-            free(pinfo);
-            pinfo = NULL;
-            break;
-         }
-
-         if (pinfo->next == NULL)
-         {
-            fprintf(STDERR, "Pointer %p not found\n", ptr);
-            break;
-         }
-
-         ppinfo = &pinfo->next;
-      }
-   }
-
-   /* Finally free the data. */
-   if (verbose != 0)
-      printf("Freeing %p\n", ptr);
-
-   if (ptr != NULL)
-      free(ptr);
-   ptr = NULL;
-}
-#endif /* USER_MEM && DEBUG */
-/* END of code to test memory allocation/deallocation */
-
-
-#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
-/* Demonstration of user chunk support of the sTER and vpAg chunks */
-
-/* (sTER is a public chunk not yet known by libpng.  vpAg is a private
-chunk used in ImageMagick to store "virtual page" size).  */
-
-static struct user_chunk_data
-{
-   png_const_infop info_ptr;
-   png_uint_32     vpAg_width, vpAg_height;
-   png_byte        vpAg_units;
-   png_byte        sTER_mode;
-   int             location[2];
-}
-user_chunk_data;
-
-/* Used for location and order; zero means nothing. */
-#define have_sTER   0x01
-#define have_vpAg   0x02
-#define before_PLTE 0x10
-#define before_IDAT 0x20
-#define after_IDAT  0x40
-
-static void
-init_callback_info(png_const_infop info_ptr)
-{
-   MEMZERO(user_chunk_data);
-   user_chunk_data.info_ptr = info_ptr;
-}
-
-static int
-set_location(png_structp png_ptr, struct user_chunk_data *data, int what)
-{
-   int location;
-
-   if ((data->location[0] & what) != 0 || (data->location[1] & what) != 0)
-      return 0; /* already have one of these */
-
-   /* Find where we are (the code below zeroes info_ptr to indicate that the
-    * chunks before the first IDAT have been read.)
-    */
-   if (data->info_ptr == NULL) /* after IDAT */
-      location = what | after_IDAT;
-
-   else if (png_get_valid(png_ptr, data->info_ptr, PNG_INFO_PLTE) != 0)
-      location = what | before_IDAT;
-
-   else
-      location = what | before_PLTE;
-
-   if (data->location[0] == 0)
-      data->location[0] = location;
-
-   else
-      data->location[1] = location;
-
-   return 1; /* handled */
-}
-
-static int PNGCBAPI
-read_user_chunk_callback(png_struct *png_ptr, png_unknown_chunkp chunk)
-{
-   struct user_chunk_data *my_user_chunk_data =
-      (struct user_chunk_data*)png_get_user_chunk_ptr(png_ptr);
-
-   if (my_user_chunk_data == NULL)
-      png_error(png_ptr, "lost user chunk pointer");
-
-   /* Return one of the following:
-    *    return (-n);  chunk had an error
-    *    return (0);  did not recognize
-    *    return (n);  success
-    *
-    * The unknown chunk structure contains the chunk data:
-    * png_byte name[5];
-    * png_byte *data;
-    * png_size_t size;
-    *
-    * Note that libpng has already taken care of the CRC handling.
-    */
-
-   if (chunk->name[0] == 115 && chunk->name[1] ==  84 &&     /* s  T */
-       chunk->name[2] ==  69 && chunk->name[3] ==  82)       /* E  R */
-      {
-         /* Found sTER chunk */
-         if (chunk->size != 1)
-            return (-1); /* Error return */
-
-         if (chunk->data[0] != 0 && chunk->data[0] != 1)
-            return (-1);  /* Invalid mode */
-
-         if (set_location(png_ptr, my_user_chunk_data, have_sTER) != 0)
-         {
-            my_user_chunk_data->sTER_mode=chunk->data[0];
-            return (1);
-         }
-
-         else
-            return (0); /* duplicate sTER - give it to libpng */
-      }
-
-   if (chunk->name[0] != 118 || chunk->name[1] != 112 ||    /* v  p */
-       chunk->name[2] !=  65 || chunk->name[3] != 103)      /* A  g */
-      return (0); /* Did not recognize */
-
-   /* Found ImageMagick vpAg chunk */
-
-   if (chunk->size != 9)
-      return (-1); /* Error return */
-
-   if (set_location(png_ptr, my_user_chunk_data, have_vpAg) == 0)
-      return (0);  /* duplicate vpAg */
-
-   my_user_chunk_data->vpAg_width = png_get_uint_31(png_ptr, chunk->data);
-   my_user_chunk_data->vpAg_height = png_get_uint_31(png_ptr, chunk->data + 4);
-   my_user_chunk_data->vpAg_units = chunk->data[8];
-
-   return (1);
-}
-
-#ifdef PNG_WRITE_SUPPORTED
-static void
-write_sTER_chunk(png_structp write_ptr)
-{
-   png_byte sTER[5] = {115,  84,  69,  82, '\0'};
-
-   if (verbose != 0)
-      fprintf(STDERR, "\n stereo mode = %d\n", user_chunk_data.sTER_mode);
-
-   png_write_chunk(write_ptr, sTER, &user_chunk_data.sTER_mode, 1);
-}
-
-static void
-write_vpAg_chunk(png_structp write_ptr)
-{
-   png_byte vpAg[5] = {118, 112,  65, 103, '\0'};
-
-   png_byte vpag_chunk_data[9];
-
-   if (verbose != 0)
-      fprintf(STDERR, " vpAg = %lu x %lu, units = %d\n",
-          (unsigned long)user_chunk_data.vpAg_width,
-          (unsigned long)user_chunk_data.vpAg_height,
-          user_chunk_data.vpAg_units);
-
-   png_save_uint_32(vpag_chunk_data, user_chunk_data.vpAg_width);
-   png_save_uint_32(vpag_chunk_data + 4, user_chunk_data.vpAg_height);
-   vpag_chunk_data[8] = user_chunk_data.vpAg_units;
-   png_write_chunk(write_ptr, vpAg, vpag_chunk_data, 9);
-}
-
-static void
-write_chunks(png_structp write_ptr, int location)
-{
-   int i;
-
-   /* Notice that this preserves the original chunk order, however chunks
-    * intercepted by the callback will be written *after* chunks passed to
-    * libpng.  This will actually reverse a pair of sTER chunks or a pair of
-    * vpAg chunks, resulting in an error later.  This is not worth worrying
-    * about - the chunks should not be duplicated!
-    */
-   for (i=0; i<2; ++i)
-   {
-      if (user_chunk_data.location[i] == (location | have_sTER))
-         write_sTER_chunk(write_ptr);
-
-      else if (user_chunk_data.location[i] == (location | have_vpAg))
-         write_vpAg_chunk(write_ptr);
-   }
-}
-#endif /* WRITE */
-#else /* !READ_USER_CHUNKS */
-#  define write_chunks(pp,loc) ((void)0)
-#endif
-/* END of code to demonstrate user chunk support */
-
-/* START of code to check that libpng has the required text support; this only
- * checks for the write support because if read support is missing the chunk
- * will simply not be reported back to pngtest.
- */
-#ifdef PNG_TEXT_SUPPORTED
-static void
-pngtest_check_text_support(png_structp png_ptr, png_textp text_ptr,
-    int num_text)
-{
-   while (num_text > 0)
-   {
-      switch (text_ptr[--num_text].compression)
-      {
-         case PNG_TEXT_COMPRESSION_NONE:
-            break;
-
-         case PNG_TEXT_COMPRESSION_zTXt:
-#           ifndef PNG_WRITE_zTXt_SUPPORTED
-               ++unsupported_chunks;
-               /* In libpng 1.7 this now does an app-error, so stop it: */
-               text_ptr[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
-#           endif
-            break;
-
-         case PNG_ITXT_COMPRESSION_NONE:
-         case PNG_ITXT_COMPRESSION_zTXt:
-#           ifndef PNG_WRITE_iTXt_SUPPORTED
-               ++unsupported_chunks;
-               text_ptr[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
-#           endif
-            break;
-
-         default:
-            /* This is an error */
-            png_error(png_ptr, "invalid text chunk compression field");
-            break;
-      }
-   }
-}
-#endif
-/* END of code to check that libpng has the required text support */
-
-/* Test one file */
-static int
-test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
-{
-   static png_FILE_p fpin;
-   static png_FILE_p fpout;  /* "static" prevents setjmp corruption */
-   pngtest_error_parameters error_parameters;
-   png_structp read_ptr;
-   png_infop read_info_ptr, end_info_ptr;
-#ifdef PNG_WRITE_SUPPORTED
-   png_structp write_ptr;
-   png_infop write_info_ptr;
-   png_infop write_end_info_ptr;
-#ifdef PNG_WRITE_FILTER_SUPPORTED
-   int interlace_preserved = 1;
-#endif /* WRITE_FILTER */
-#else /* !WRITE */
-   png_structp write_ptr = NULL;
-   png_infop write_info_ptr = NULL;
-   png_infop write_end_info_ptr = NULL;
-#endif /* !WRITE */
-   png_bytep row_buf;
-   png_uint_32 y;
-   png_uint_32 width, height;
-   volatile int num_passes;
-   int pass;
-   int bit_depth, color_type;
-
-   row_buf = NULL;
-   error_parameters.file_name = inname;
-
-   if ((fpin = fopen(inname, "rb")) == NULL)
-   {
-      fprintf(STDERR, "Could not find input file %s\n", inname);
-      return (1);
-   }
-
-   if ((fpout = fopen(outname, "wb")) == NULL)
-   {
-      fprintf(STDERR, "Could not open output file %s\n", outname);
-      FCLOSE(fpin);
-      return (1);
-   }
-
-   pngtest_debug("Allocating read and write structures");
-#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
-   read_ptr =
-       png_create_read_struct_2(PNG_LIBPNG_VER_STRING, NULL,
-       NULL, NULL, NULL, png_debug_malloc, png_debug_free);
-#else
-   read_ptr =
-       png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-#endif
-   png_set_error_fn(read_ptr, &error_parameters, pngtest_error,
-       pngtest_warning);
-
-#ifdef PNG_WRITE_SUPPORTED
-#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
-   write_ptr =
-       png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL,
-       NULL, NULL, NULL, png_debug_malloc, png_debug_free);
-#else
-   write_ptr =
-       png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-#endif
-   png_set_error_fn(write_ptr, &error_parameters, pngtest_error,
-       pngtest_warning);
-#endif
-   pngtest_debug("Allocating read_info, write_info and end_info structures");
-   read_info_ptr = png_create_info_struct(read_ptr);
-   end_info_ptr = png_create_info_struct(read_ptr);
-#ifdef PNG_WRITE_SUPPORTED
-   write_info_ptr = png_create_info_struct(write_ptr);
-   write_end_info_ptr = png_create_info_struct(write_ptr);
-#endif
-
-#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
-   init_callback_info(read_info_ptr);
-   png_set_read_user_chunk_fn(read_ptr, &user_chunk_data,
-       read_user_chunk_callback);
-#endif
-
-#ifdef PNG_SETJMP_SUPPORTED
-   pngtest_debug("Setting jmpbuf for read struct");
-   if (setjmp(png_jmpbuf(read_ptr)))
-   {
-      fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname);
-      png_free(read_ptr, row_buf);
-      row_buf = NULL;
-      if (verbose != 0)
-        fprintf(STDERR, "   destroy read structs\n");
-      png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
-#ifdef PNG_WRITE_SUPPORTED
-      if (verbose != 0)
-        fprintf(STDERR, "   destroy write structs\n");
-      png_destroy_info_struct(write_ptr, &write_end_info_ptr);
-      png_destroy_write_struct(&write_ptr, &write_info_ptr);
-#endif
-      FCLOSE(fpin);
-      FCLOSE(fpout);
-      return (1);
-   }
-
-#ifdef PNG_WRITE_SUPPORTED
-   pngtest_debug("Setting jmpbuf for write struct");
-
-   if (setjmp(png_jmpbuf(write_ptr)))
-   {
-      fprintf(STDERR, "%s -> %s: libpng write error\n", inname, outname);
-      if (verbose != 0)
-        fprintf(STDERR, "   destroying read structs\n");
-      png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
-      if (verbose != 0)
-        fprintf(STDERR, "   destroying write structs\n");
-      png_destroy_info_struct(write_ptr, &write_end_info_ptr);
-      png_destroy_write_struct(&write_ptr, &write_info_ptr);
-      FCLOSE(fpin);
-      FCLOSE(fpout);
-      return (1);
-   }
-#endif
-#endif
-
-#ifdef PNG_BENIGN_ERRORS_SUPPORTED
-   if (strict != 0)
-   {
-      /* Treat png_benign_error() as errors on read */
-      png_set_benign_errors(read_ptr, 0);
-
-# ifdef PNG_WRITE_SUPPORTED
-      /* Treat them as errors on write */
-      png_set_benign_errors(write_ptr, 0);
-# endif
-
-      /* if strict is not set, then app warnings and errors are treated as
-       * warnings in release builds, but not in unstable builds; this can be
-       * changed with '--relaxed'.
-       */
-   }
-
-   else if (relaxed != 0)
-   {
-      /* Allow application (pngtest) errors and warnings to pass */
-      png_set_benign_errors(read_ptr, 1);
-
-      /* Turn off CRC checking while reading */
-      png_set_crc_action(read_ptr, PNG_CRC_QUIET_USE, PNG_CRC_QUIET_USE);
-
-#ifdef PNG_IGNORE_ADLER32
-      /* Turn off ADLER32 checking while reading */
-      png_set_option(read_ptr, PNG_IGNORE_ADLER32, PNG_OPTION_ON);
-#endif
-
-# ifdef PNG_WRITE_SUPPORTED
-      png_set_benign_errors(write_ptr, 1);
-# endif
-
-   }
-#endif /* BENIGN_ERRORS */
-
-   pngtest_debug("Initializing input and output streams");
-#ifdef PNG_STDIO_SUPPORTED
-   png_init_io(read_ptr, fpin);
-#  ifdef PNG_WRITE_SUPPORTED
-   png_init_io(write_ptr, fpout);
-#  endif
-#else
-   png_set_read_fn(read_ptr, (png_voidp)fpin, pngtest_read_data);
-#  ifdef PNG_WRITE_SUPPORTED
-   png_set_write_fn(write_ptr, (png_voidp)fpout,  pngtest_write_data,
-#    ifdef PNG_WRITE_FLUSH_SUPPORTED
-       pngtest_flush);
-#    else
-       NULL);
-#    endif
-#  endif
-#endif
-
-   if (status_dots_requested == 1)
-   {
-#ifdef PNG_WRITE_SUPPORTED
-      png_set_write_status_fn(write_ptr, write_row_callback);
-#endif
-      png_set_read_status_fn(read_ptr, read_row_callback);
-   }
-
-   else
-   {
-#ifdef PNG_WRITE_SUPPORTED
-      png_set_write_status_fn(write_ptr, NULL);
-#endif
-      png_set_read_status_fn(read_ptr, NULL);
-   }
-
-#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
-   png_set_read_user_transform_fn(read_ptr, read_user_callback);
-#endif
-#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
-   zero_samples = 0;
-   png_set_write_user_transform_fn(write_ptr, count_zero_samples);
-#endif
-
-#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
-   /* Preserve all the unknown chunks, if possible.  If this is disabled then,
-    * even if the png_{get,set}_unknown_chunks stuff is enabled, we can't use
-    * libpng to *save* the unknown chunks on read (because we can't switch the
-    * save option on!)
-    *
-    * Notice that if SET_UNKNOWN_CHUNKS is *not* supported read will discard all
-    * unknown chunks and write will write them all.
-    */
-#ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
-   png_set_keep_unknown_chunks(read_ptr, PNG_HANDLE_CHUNK_ALWAYS,
-       NULL, 0);
-#endif
-#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-   png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_ALWAYS,
-       NULL, 0);
-#endif
-#endif
-
-   pngtest_debug("Reading info struct");
-   png_read_info(read_ptr, read_info_ptr);
-
-#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
-   /* This is a bit of a hack; there is no obvious way in the callback function
-    * to determine that the chunks before the first IDAT have been read, so
-    * remove the info_ptr (which is only used to determine position relative to
-    * PLTE) here to indicate that we are after the IDAT.
-    */
-   user_chunk_data.info_ptr = NULL;
-#endif
-
-   pngtest_debug("Transferring info struct");
-   {
-      int interlace_type, compression_type, filter_type;
-
-      if (png_get_IHDR(read_ptr, read_info_ptr, &width, &height, &bit_depth,
-          &color_type, &interlace_type, &compression_type, &filter_type) != 0)
-      {
-         png_set_IHDR(write_ptr, write_info_ptr, width, height, bit_depth,
-             color_type, interlace_type, compression_type, filter_type);
-         /* num_passes may not be available below if interlace support is not
-          * provided by libpng for both read and write.
-          */
-         switch (interlace_type)
-         {
-            case PNG_INTERLACE_NONE:
-               num_passes = 1;
-               break;
-
-            case PNG_INTERLACE_ADAM7:
-               num_passes = 7;
-               break;
-
-            default:
-               png_error(read_ptr, "invalid interlace type");
-               /*NOT REACHED*/
-         }
-      }
-
-      else
-         png_error(read_ptr, "png_get_IHDR failed");
-   }
-#ifdef PNG_FIXED_POINT_SUPPORTED
-#ifdef PNG_cHRM_SUPPORTED
-   {
-      png_fixed_point white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
-          blue_y;
-
-      if (png_get_cHRM_fixed(read_ptr, read_info_ptr, &white_x, &white_y,
-          &red_x, &red_y, &green_x, &green_y, &blue_x, &blue_y) != 0)
-      {
-         png_set_cHRM_fixed(write_ptr, write_info_ptr, white_x, white_y, red_x,
-             red_y, green_x, green_y, blue_x, blue_y);
-      }
-   }
-#endif
-#ifdef PNG_gAMA_SUPPORTED
-   {
-      png_fixed_point gamma;
-
-      if (png_get_gAMA_fixed(read_ptr, read_info_ptr, &gamma) != 0)
-         png_set_gAMA_fixed(write_ptr, write_info_ptr, gamma);
-   }
-#endif
-#else /* Use floating point versions */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-#ifdef PNG_cHRM_SUPPORTED
-   {
-      double white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
-          blue_y;
-
-      if (png_get_cHRM(read_ptr, read_info_ptr, &white_x, &white_y, &red_x,
-          &red_y, &green_x, &green_y, &blue_x, &blue_y) != 0)
-      {
-         png_set_cHRM(write_ptr, write_info_ptr, white_x, white_y, red_x,
-             red_y, green_x, green_y, blue_x, blue_y);
-      }
-   }
-#endif
-#ifdef PNG_gAMA_SUPPORTED
-   {
-      double gamma;
-
-      if (png_get_gAMA(read_ptr, read_info_ptr, &gamma) != 0)
-         png_set_gAMA(write_ptr, write_info_ptr, gamma);
-   }
-#endif
-#endif /* Floating point */
-#endif /* Fixed point */
-#ifdef PNG_iCCP_SUPPORTED
-   {
-      png_charp name;
-      png_bytep profile;
-      png_uint_32 proflen;
-      int compression_type;
-
-      if (png_get_iCCP(read_ptr, read_info_ptr, &name, &compression_type,
-          &profile, &proflen) != 0)
-      {
-         png_set_iCCP(write_ptr, write_info_ptr, name, compression_type,
-             profile, proflen);
-      }
-   }
-#endif
-#ifdef PNG_sRGB_SUPPORTED
-   {
-      int intent;
-
-      if (png_get_sRGB(read_ptr, read_info_ptr, &intent) != 0)
-         png_set_sRGB(write_ptr, write_info_ptr, intent);
-   }
-#endif
-   {
-      png_colorp palette;
-      int num_palette;
-
-      if (png_get_PLTE(read_ptr, read_info_ptr, &palette, &num_palette) != 0)
-         png_set_PLTE(write_ptr, write_info_ptr, palette, num_palette);
-   }
-#ifdef PNG_bKGD_SUPPORTED
-   {
-      png_color_16p background;
-
-      if (png_get_bKGD(read_ptr, read_info_ptr, &background) != 0)
-      {
-         png_set_bKGD(write_ptr, write_info_ptr, background);
-      }
-   }
-#endif
-#ifdef PNG_READ_eXIf_SUPPORTED
-   {
-      png_bytep exif=NULL;
-      png_uint_32 exif_length;
-
-      if (png_get_eXIf_1(read_ptr, read_info_ptr, &exif_length, &exif) != 0)
-      {
-         if (exif_length > 1)
-            fprintf(STDERR," eXIf type %c%c, %lu bytes\n",exif[0],exif[1],
-               (unsigned long)exif_length);
-# ifdef PNG_WRITE_eXIf_SUPPORTED
-         png_set_eXIf_1(write_ptr, write_info_ptr, exif_length, exif);
-# endif
-      }
-   }
-#endif
-#ifdef PNG_hIST_SUPPORTED
-   {
-      png_uint_16p hist;
-
-      if (png_get_hIST(read_ptr, read_info_ptr, &hist) != 0)
-         png_set_hIST(write_ptr, write_info_ptr, hist);
-   }
-#endif
-#ifdef PNG_oFFs_SUPPORTED
-   {
-      png_int_32 offset_x, offset_y;
-      int unit_type;
-
-      if (png_get_oFFs(read_ptr, read_info_ptr, &offset_x, &offset_y,
-          &unit_type) != 0)
-      {
-         png_set_oFFs(write_ptr, write_info_ptr, offset_x, offset_y, unit_type);
-      }
-   }
-#endif
-#ifdef PNG_pCAL_SUPPORTED
-   {
-      png_charp purpose, units;
-      png_charpp params;
-      png_int_32 X0, X1;
-      int type, nparams;
-
-      if (png_get_pCAL(read_ptr, read_info_ptr, &purpose, &X0, &X1, &type,
-          &nparams, &units, &params) != 0)
-      {
-         png_set_pCAL(write_ptr, write_info_ptr, purpose, X0, X1, type,
-             nparams, units, params);
-      }
-   }
-#endif
-#ifdef PNG_pHYs_SUPPORTED
-   {
-      png_uint_32 res_x, res_y;
-      int unit_type;
-
-      if (png_get_pHYs(read_ptr, read_info_ptr, &res_x, &res_y,
-          &unit_type) != 0)
-         png_set_pHYs(write_ptr, write_info_ptr, res_x, res_y, unit_type);
-   }
-#endif
-#ifdef PNG_sBIT_SUPPORTED
-   {
-      png_color_8p sig_bit;
-
-      if (png_get_sBIT(read_ptr, read_info_ptr, &sig_bit) != 0)
-         png_set_sBIT(write_ptr, write_info_ptr, sig_bit);
-   }
-#endif
-#ifdef PNG_sCAL_SUPPORTED
-#if defined(PNG_FLOATING_POINT_SUPPORTED) && \
-   defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
-   {
-      int unit;
-      double scal_width, scal_height;
-
-      if (png_get_sCAL(read_ptr, read_info_ptr, &unit, &scal_width,
-          &scal_height) != 0)
-      {
-         png_set_sCAL(write_ptr, write_info_ptr, unit, scal_width, scal_height);
-      }
-   }
-#else
-#ifdef PNG_FIXED_POINT_SUPPORTED
-   {
-      int unit;
-      png_charp scal_width, scal_height;
-
-      if (png_get_sCAL_s(read_ptr, read_info_ptr, &unit, &scal_width,
-           &scal_height) != 0)
-      {
-         png_set_sCAL_s(write_ptr, write_info_ptr, unit, scal_width,
-             scal_height);
-      }
-   }
-#endif
-#endif
-#endif
-
-#ifdef PNG_sPLT_SUPPORTED
-   {
-       png_sPLT_tp entries;
-
-       int num_entries = (int) png_get_sPLT(read_ptr, read_info_ptr, &entries);
-       if (num_entries)
-       {
-           png_set_sPLT(write_ptr, write_info_ptr, entries, num_entries);
-       }
-   }
-#endif
-
-#ifdef PNG_TEXT_SUPPORTED
-   {
-      png_textp text_ptr;
-      int num_text;
-
-      if (png_get_text(read_ptr, read_info_ptr, &text_ptr, &num_text) > 0)
-      {
-         pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text);
-
-         pngtest_check_text_support(read_ptr, text_ptr, num_text);
-
-         if (verbose != 0)
-         {
-            int i;
-
-            fprintf(STDERR,"\n");
-            for (i=0; i<num_text; i++)
-            {
-               fprintf(STDERR,"   Text compression[%d]=%d\n",
-                   i, text_ptr[i].compression);
-            }
-         }
-
-         png_set_text(write_ptr, write_info_ptr, text_ptr, num_text);
-      }
-   }
-#endif
-#ifdef PNG_tIME_SUPPORTED
-   {
-      png_timep mod_time;
-
-      if (png_get_tIME(read_ptr, read_info_ptr, &mod_time) != 0)
-      {
-         png_set_tIME(write_ptr, write_info_ptr, mod_time);
-#ifdef PNG_TIME_RFC1123_SUPPORTED
-         if (png_convert_to_rfc1123_buffer(tIME_string, mod_time) != 0)
-            tIME_string[(sizeof tIME_string) - 1] = '\0';
-
-         else
-         {
-            strncpy(tIME_string, "*** invalid time ***", (sizeof tIME_string));
-            tIME_string[(sizeof tIME_string) - 1] = '\0';
-         }
-
-         tIME_chunk_present++;
-#endif /* TIME_RFC1123 */
-      }
-   }
-#endif
-#ifdef PNG_tRNS_SUPPORTED
-   {
-      png_bytep trans_alpha;
-      int num_trans;
-      png_color_16p trans_color;
-
-      if (png_get_tRNS(read_ptr, read_info_ptr, &trans_alpha, &num_trans,
-          &trans_color) != 0)
-      {
-         int sample_max = (1 << bit_depth);
-         /* libpng doesn't reject a tRNS chunk with out-of-range samples */
-         if (!((color_type == PNG_COLOR_TYPE_GRAY &&
-             (int)trans_color->gray > sample_max) ||
-             (color_type == PNG_COLOR_TYPE_RGB &&
-             ((int)trans_color->red > sample_max ||
-             (int)trans_color->green > sample_max ||
-             (int)trans_color->blue > sample_max))))
-            png_set_tRNS(write_ptr, write_info_ptr, trans_alpha, num_trans,
-               trans_color);
-      }
-   }
-#endif
-#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-   {
-      png_unknown_chunkp unknowns;
-      int num_unknowns = png_get_unknown_chunks(read_ptr, read_info_ptr,
-          &unknowns);
-
-      if (num_unknowns != 0)
-      {
-         png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
-             num_unknowns);
-#if PNG_LIBPNG_VER < 10600
-         /* Copy the locations from the read_info_ptr.  The automatically
-          * generated locations in write_end_info_ptr are wrong prior to 1.6.0
-          * because they are reset from the write pointer (removed in 1.6.0).
-          */
-         {
-            int i;
-            for (i = 0; i < num_unknowns; i++)
-              png_set_unknown_chunk_location(write_ptr, write_info_ptr, i,
-                  unknowns[i].location);
-         }
-#endif
-      }
-   }
-#endif
-
-#ifdef PNG_WRITE_SUPPORTED
-   pngtest_debug("Writing info struct");
-
-   /* Write the info in two steps so that if we write the 'unknown' chunks here
-    * they go to the correct place.
-    */
-   png_write_info_before_PLTE(write_ptr, write_info_ptr);
-
-   write_chunks(write_ptr, before_PLTE); /* before PLTE */
-
-   png_write_info(write_ptr, write_info_ptr);
-
-   write_chunks(write_ptr, before_IDAT); /* after PLTE */
-
-   png_write_info(write_ptr, write_end_info_ptr);
-
-   write_chunks(write_ptr, after_IDAT); /* after IDAT */
-
-#ifdef PNG_COMPRESSION_COMPAT
-   /* Test the 'compatibility' setting here, if it is available. */
-   png_set_compression(write_ptr, PNG_COMPRESSION_COMPAT);
-#endif
-#endif
-
-#ifdef SINGLE_ROWBUF_ALLOC
-   pngtest_debug("Allocating row buffer...");
-   row_buf = (png_bytep)png_malloc(read_ptr,
-       png_get_rowbytes(read_ptr, read_info_ptr));
-
-   pngtest_debug1("\t0x%08lx", (unsigned long)row_buf);
-#endif /* SINGLE_ROWBUF_ALLOC */
-   pngtest_debug("Writing row data");
-
-#if defined(PNG_READ_INTERLACING_SUPPORTED) &&\
-   defined(PNG_WRITE_INTERLACING_SUPPORTED)
-   /* Both must be defined for libpng to be able to handle the interlace,
-    * otherwise it gets handled below by simply reading and writing the passes
-    * directly.
-    */
-   if (png_set_interlace_handling(read_ptr) != num_passes)
-      png_error(write_ptr,
-          "png_set_interlace_handling(read): wrong pass count ");
-   if (png_set_interlace_handling(write_ptr) != num_passes)
-      png_error(write_ptr,
-          "png_set_interlace_handling(write): wrong pass count ");
-#else /* png_set_interlace_handling not called on either read or write */
-#  define calc_pass_height
-#endif /* not using libpng interlace handling */
-
-#ifdef PNGTEST_TIMING
-   t_stop = (float)clock();
-   t_misc += (t_stop - t_start);
-   t_start = t_stop;
-#endif
-   for (pass = 0; pass < num_passes; pass++)
-   {
-#     ifdef calc_pass_height
-         png_uint_32 pass_height;
-
-         if (num_passes == 7) /* interlaced */
-         {
-            if (PNG_PASS_COLS(width, pass) > 0)
-               pass_height = PNG_PASS_ROWS(height, pass);
-
-            else
-               pass_height = 0;
-         }
-
-         else /* not interlaced */
-            pass_height = height;
-#     else
-#        define pass_height height
-#     endif
-
-      pngtest_debug1("Writing row data for pass %d", pass);
-      for (y = 0; y < pass_height; y++)
-      {
-#ifndef SINGLE_ROWBUF_ALLOC
-         pngtest_debug2("Allocating row buffer (pass %d, y = %u)...", pass, y);
-
-         row_buf = (png_bytep)png_malloc(read_ptr,
-             png_get_rowbytes(read_ptr, read_info_ptr));
-
-         pngtest_debug2("\t0x%08lx (%lu bytes)", (unsigned long)row_buf,
-             (unsigned long)png_get_rowbytes(read_ptr, read_info_ptr));
-
-#endif /* !SINGLE_ROWBUF_ALLOC */
-         png_read_rows(read_ptr, (png_bytepp)&row_buf, NULL, 1);
-
-#ifdef PNG_WRITE_SUPPORTED
-#ifdef PNGTEST_TIMING
-         t_stop = (float)clock();
-         t_decode += (t_stop - t_start);
-         t_start = t_stop;
-#endif
-         png_write_rows(write_ptr, (png_bytepp)&row_buf, 1);
-#ifdef PNGTEST_TIMING
-         t_stop = (float)clock();
-         t_encode += (t_stop - t_start);
-         t_start = t_stop;
-#endif
-#endif /* WRITE */
-
-#ifndef SINGLE_ROWBUF_ALLOC
-         pngtest_debug2("Freeing row buffer (pass %d, y = %u)", pass, y);
-         png_free(read_ptr, row_buf);
-         row_buf = NULL;
-#endif /* !SINGLE_ROWBUF_ALLOC */
-      }
-   }
-
-#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
-#  ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
-      png_free_data(read_ptr, read_info_ptr, PNG_FREE_UNKN, -1);
-#  endif
-#  ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-      png_free_data(write_ptr, write_info_ptr, PNG_FREE_UNKN, -1);
-#  endif
-#endif
-
-   pngtest_debug("Reading and writing end_info data");
-
-   png_read_end(read_ptr, end_info_ptr);
-#ifdef PNG_TEXT_SUPPORTED
-   {
-      png_textp text_ptr;
-      int num_text;
-
-      if (png_get_text(read_ptr, end_info_ptr, &text_ptr, &num_text) > 0)
-      {
-         pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text);
-
-         pngtest_check_text_support(read_ptr, text_ptr, num_text);
-
-         if (verbose != 0)
-         {
-            int i;
-
-            fprintf(STDERR,"\n");
-            for (i=0; i<num_text; i++)
-            {
-               fprintf(STDERR,"   Text compression[%d]=%d\n",
-                   i, text_ptr[i].compression);
-            }
-         }
-
-         png_set_text(write_ptr, write_end_info_ptr, text_ptr, num_text);
-      }
-   }
-#endif
-#ifdef PNG_READ_eXIf_SUPPORTED
-   {
-      png_bytep exif=NULL;
-      png_uint_32 exif_length;
-
-      if (png_get_eXIf_1(read_ptr, end_info_ptr, &exif_length, &exif) != 0)
-      {
-         if (exif_length > 1)
-            fprintf(STDERR," eXIf type %c%c, %lu bytes\n",exif[0],exif[1],
-               (unsigned long)exif_length);
-# ifdef PNG_WRITE_eXIf_SUPPORTED
-         png_set_eXIf_1(write_ptr, write_end_info_ptr, exif_length, exif);
-# endif
-      }
-   }
-#endif
-#ifdef PNG_tIME_SUPPORTED
-   {
-      png_timep mod_time;
-
-      if (png_get_tIME(read_ptr, end_info_ptr, &mod_time) != 0)
-      {
-         png_set_tIME(write_ptr, write_end_info_ptr, mod_time);
-#ifdef PNG_TIME_RFC1123_SUPPORTED
-         if (png_convert_to_rfc1123_buffer(tIME_string, mod_time) != 0)
-            tIME_string[(sizeof tIME_string) - 1] = '\0';
-
-         else
-         {
-            strncpy(tIME_string, "*** invalid time ***", sizeof tIME_string);
-            tIME_string[(sizeof tIME_string)-1] = '\0';
-         }
-
-         tIME_chunk_present++;
-#endif /* TIME_RFC1123 */
-      }
-   }
-#endif
-#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-   {
-      png_unknown_chunkp unknowns;
-      int num_unknowns = png_get_unknown_chunks(read_ptr, end_info_ptr,
-          &unknowns);
-
-      if (num_unknowns != 0)
-      {
-         png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
-             num_unknowns);
-#if PNG_LIBPNG_VER < 10600
-         /* Copy the locations from the read_info_ptr.  The automatically
-          * generated locations in write_end_info_ptr are wrong prior to 1.6.0
-          * because they are reset from the write pointer (removed in 1.6.0).
-          */
-         {
-            int i;
-            for (i = 0; i < num_unknowns; i++)
-              png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
-                  unknowns[i].location);
-         }
-#endif
-      }
-   }
-#endif
-
-#ifdef PNG_WRITE_SUPPORTED
-#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
-   /* Normally one would use Z_DEFAULT_STRATEGY for text compression.
-    * This is here just to make pngtest replicate the results from libpng
-    * versions prior to 1.5.4, and to test this new API.
-    */
-   png_set_text_compression_strategy(write_ptr, Z_FILTERED);
-#endif
-
-   /* When the unknown vpAg/sTER chunks are written by pngtest the only way to
-    * do it is to write them *before* calling png_write_end.  When unknown
-    * chunks are written by libpng, however, they are written just before IEND.
-    * There seems to be no way round this, however vpAg/sTER are not expected
-    * after IDAT.
-    */
-   write_chunks(write_ptr, after_IDAT);
-
-   png_write_end(write_ptr, write_end_info_ptr);
-#endif
-
-#ifdef PNG_EASY_ACCESS_SUPPORTED
-   if (verbose != 0)
-   {
-      png_uint_32 iwidth, iheight;
-      iwidth = png_get_image_width(write_ptr, write_info_ptr);
-      iheight = png_get_image_height(write_ptr, write_info_ptr);
-      fprintf(STDERR, "\n Image width = %lu, height = %lu\n",
-          (unsigned long)iwidth, (unsigned long)iheight);
-   }
-#endif
-
-   pngtest_debug("Destroying data structs");
-#ifdef SINGLE_ROWBUF_ALLOC
-   pngtest_debug("destroying row_buf for read_ptr");
-   png_free(read_ptr, row_buf);
-   row_buf = NULL;
-#endif /* SINGLE_ROWBUF_ALLOC */
-   pngtest_debug("destroying read_ptr, read_info_ptr, end_info_ptr");
-   png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
-#ifdef PNG_WRITE_SUPPORTED
-   pngtest_debug("destroying write_end_info_ptr");
-   png_destroy_info_struct(write_ptr, &write_end_info_ptr);
-   pngtest_debug("destroying write_ptr, write_info_ptr");
-   png_destroy_write_struct(&write_ptr, &write_info_ptr);
-#endif
-   pngtest_debug("Destruction complete.");
-
-   FCLOSE(fpin);
-   FCLOSE(fpout);
-
-   /* Summarize any warnings or errors and in 'strict' mode fail the test.
-    * Unsupported chunks can result in warnings, in that case ignore the strict
-    * setting, otherwise fail the test on warnings as well as errors.
-    */
-   if (error_count > 0)
-   {
-      /* We don't really expect to get here because of the setjmp handling
-       * above, but this is safe.
-       */
-      fprintf(STDERR, "\n  %s: %d libpng errors found (%d warnings)",
-          inname, error_count, warning_count);
-
-      if (strict != 0)
-         return (1);
-   }
-
-#  ifdef PNG_WRITE_SUPPORTED
-      /* If there is no write support nothing was written! */
-      else if (unsupported_chunks > 0)
-      {
-         fprintf(STDERR, "\n  %s: unsupported chunks (%d)%s",
-             inname, unsupported_chunks, strict ? ": IGNORED --strict!" : "");
-      }
-#  endif
-
-   else if (warning_count > 0)
-   {
-      fprintf(STDERR, "\n  %s: %d libpng warnings found",
-          inname, warning_count);
-
-      if (strict != 0)
-         return (1);
-   }
-
-   pngtest_debug("Opening files for comparison");
-   if ((fpin = fopen(inname, "rb")) == NULL)
-   {
-      fprintf(STDERR, "Could not find file %s\n", inname);
-      return (1);
-   }
-
-   if ((fpout = fopen(outname, "rb")) == NULL)
-   {
-      fprintf(STDERR, "Could not find file %s\n", outname);
-      FCLOSE(fpin);
-      return (1);
-   }
-
-#if defined (PNG_WRITE_SUPPORTED) /* else nothing was written */ &&\
-    defined (PNG_WRITE_FILTER_SUPPORTED)
-   if (interlace_preserved != 0) /* else the files will be changed */
-   {
-      for (;;)
-      {
-         static int wrote_question = 0;
-         png_size_t num_in, num_out;
-         char inbuf[256], outbuf[256];
-
-         num_in = fread(inbuf, 1, sizeof inbuf, fpin);
-         num_out = fread(outbuf, 1, sizeof outbuf, fpout);
-
-         if (num_in != num_out)
-         {
-            fprintf(STDERR, "\nFiles %s and %s are of a different size\n",
-                inname, outname);
-
-            if (wrote_question == 0 && unsupported_chunks == 0)
-            {
-               fprintf(STDERR,
-                   "   Was %s written with the same maximum IDAT"
-                   " chunk size (%d bytes),",
-                   inname, PNG_ZBUF_SIZE);
-               fprintf(STDERR,
-                   "\n   filtering heuristic (libpng default), compression");
-               fprintf(STDERR,
-                   " level (zlib default),\n   and zlib version (%s)?\n\n",
-                   ZLIB_VERSION);
-               wrote_question = 1;
-            }
-
-            FCLOSE(fpin);
-            FCLOSE(fpout);
-
-            if (strict != 0 && unsupported_chunks == 0)
-              return (1);
-
-            else
-              return (0);
-         }
-
-         if (num_in == 0)
-            break;
-
-         if (memcmp(inbuf, outbuf, num_in))
-         {
-            fprintf(STDERR, "\nFiles %s and %s are different\n", inname,
-                outname);
-
-            if (wrote_question == 0 && unsupported_chunks == 0)
-            {
-               fprintf(STDERR,
-                   "   Was %s written with the same maximum"
-                   " IDAT chunk size (%d bytes),",
-                    inname, PNG_ZBUF_SIZE);
-               fprintf(STDERR,
-                   "\n   filtering heuristic (libpng default), compression");
-               fprintf(STDERR,
-                   " level (zlib default),\n   and zlib version (%s)?\n\n",
-                 ZLIB_VERSION);
-               wrote_question = 1;
-            }
-
-            FCLOSE(fpin);
-            FCLOSE(fpout);
-
-            /* NOTE: the unsupported_chunks escape is permitted here because
-             * unsupported text chunk compression will result in the compression
-             * mode being changed (to NONE) yet, in the test case, the result
-             * can be exactly the same size!
-             */
-            if (strict != 0 && unsupported_chunks == 0)
-              return (1);
-
-            else
-              return (0);
-         }
-      }
-   }
-#endif /* WRITE && WRITE_FILTER */
-
-   FCLOSE(fpin);
-   FCLOSE(fpout);
-
-   return (0);
-}
-
-/* Input and output filenames */
-#ifdef RISCOS
-static PNG_CONST char *inname = "pngtest/png";
-static PNG_CONST char *outname = "pngout/png";
-#else
-static PNG_CONST char *inname = "pngtest.png";
-static PNG_CONST char *outname = "pngout.png";
-#endif
-
-int
-main(int argc, char *argv[])
-{
-   int multiple = 0;
-   int ierror = 0;
-
-   png_structp dummy_ptr;
-
-   fprintf(STDERR, "\n Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
-   fprintf(STDERR, "   with zlib   version %s\n", ZLIB_VERSION);
-   fprintf(STDERR, "%s", png_get_copyright(NULL));
-   /* Show the version of libpng used in building the library */
-   fprintf(STDERR, " library (%lu):%s",
-       (unsigned long)png_access_version_number(),
-       png_get_header_version(NULL));
-
-   /* Show the version of libpng used in building the application */
-   fprintf(STDERR, " pngtest (%lu):%s", (unsigned long)PNG_LIBPNG_VER,
-       PNG_HEADER_VERSION_STRING);
-
-   /* Do some consistency checking on the memory allocation settings, I'm
-    * not sure this matters, but it is nice to know, the first of these
-    * tests should be impossible because of the way the macros are set
-    * in pngconf.h
-    */
-#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
-      fprintf(STDERR, " NOTE: Zlib compiled for max 64k, libpng not\n");
-#endif
-   /* I think the following can happen. */
-#if !defined(MAXSEG_64K) && defined(PNG_MAX_MALLOC_64K)
-      fprintf(STDERR, " NOTE: libpng compiled for max 64k, zlib not\n");
-#endif
-
-   if (strcmp(png_libpng_ver, PNG_LIBPNG_VER_STRING))
-   {
-      fprintf(STDERR,
-          "Warning: versions are different between png.h and png.c\n");
-      fprintf(STDERR, "  png.h version: %s\n", PNG_LIBPNG_VER_STRING);
-      fprintf(STDERR, "  png.c version: %s\n\n", png_libpng_ver);
-      ++ierror;
-   }
-
-   if (argc > 1)
-   {
-      if (strcmp(argv[1], "-m") == 0)
-      {
-         multiple = 1;
-         status_dots_requested = 0;
-      }
-
-      else if (strcmp(argv[1], "-mv") == 0 ||
-               strcmp(argv[1], "-vm") == 0 )
-      {
-         multiple = 1;
-         verbose = 1;
-         status_dots_requested = 1;
-      }
-
-      else if (strcmp(argv[1], "-v") == 0)
-      {
-         verbose = 1;
-         status_dots_requested = 1;
-         inname = argv[2];
-      }
-
-      else if (strcmp(argv[1], "--strict") == 0)
-      {
-         status_dots_requested = 0;
-         verbose = 1;
-         inname = argv[2];
-         strict++;
-         relaxed = 0;
-         multiple=1;
-      }
-
-      else if (strcmp(argv[1], "--relaxed") == 0)
-      {
-         status_dots_requested = 0;
-         verbose = 1;
-         inname = argv[2];
-         strict = 0;
-         relaxed++;
-         multiple=1;
-      }
-      else if (strcmp(argv[1], "--xfail") == 0)
-      {
-         status_dots_requested = 0;
-         verbose = 1;
-         inname = argv[2];
-         strict = 0;
-         xfail++;
-         relaxed++;
-         multiple=1;
-      }
-
-      else
-      {
-         inname = argv[1];
-         status_dots_requested = 0;
-      }
-   }
-
-   if (multiple == 0 && argc == 3 + verbose)
-      outname = argv[2 + verbose];
-
-   if ((multiple == 0 && argc > 3 + verbose) ||
-       (multiple != 0 && argc < 2))
-   {
-      fprintf(STDERR,
-          "usage: %s [infile.png] [outfile.png]\n\t%s -m {infile.png}\n",
-          argv[0], argv[0]);
-      fprintf(STDERR,
-          "  reads/writes one PNG file (without -m) or multiple files (-m)\n");
-      fprintf(STDERR,
-          "  with -m %s is used as a temporary file\n", outname);
-      exit(1);
-   }
-
-   if (multiple != 0)
-   {
-      int i;
-#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
-      int allocation_now = current_allocation;
-#endif
-      for (i=2; i<argc; ++i)
-      {
-         int kerror;
-         fprintf(STDERR, "\n Testing %s:", argv[i]);
-#if PNG_DEBUG > 0
-         fprintf(STDERR, "\n");
-#endif
-         kerror = test_one_file(argv[i], outname);
-         if (kerror == 0)
-         {
-#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
-            fprintf(STDERR, "\n PASS (%lu zero samples)\n",
-                (unsigned long)zero_samples);
-#else
-            fprintf(STDERR, " PASS\n");
-#endif
-#ifdef PNG_TIME_RFC1123_SUPPORTED
-            if (tIME_chunk_present != 0)
-               fprintf(STDERR, " tIME = %s\n", tIME_string);
-
-            tIME_chunk_present = 0;
-#endif /* TIME_RFC1123 */
-         }
-
-         else
-         {
-            if (xfail)
-              fprintf(STDERR, " XFAIL\n");
-            else
-            {
-              fprintf(STDERR, " FAIL\n");
-              ierror += kerror;
-            }
-         }
-#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
-         if (allocation_now != current_allocation)
-            fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
-                current_allocation - allocation_now);
-
-         if (current_allocation != 0)
-         {
-            memory_infop pinfo = pinformation;
-
-            fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
-                current_allocation);
-
-            while (pinfo != NULL)
-            {
-               fprintf(STDERR, " %lu bytes at %p\n",
-                   (unsigned long)pinfo->size,
-                   pinfo->pointer);
-               pinfo = pinfo->next;
-            }
-         }
-#endif
-      }
-#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
-         fprintf(STDERR, " Current memory allocation: %10d bytes\n",
-             current_allocation);
-         fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
-             maximum_allocation);
-         fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
-             total_allocation);
-         fprintf(STDERR, "     Number of allocations: %10d\n",
-             num_allocations);
-#endif
-   }
-
-   else
-   {
-      int i;
-      for (i = 0; i<3; ++i)
-      {
-         int kerror;
-#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
-         int allocation_now = current_allocation;
-#endif
-         if (i == 1)
-            status_dots_requested = 1;
-
-         else if (verbose == 0)
-            status_dots_requested = 0;
-
-         if (i == 0 || verbose == 1 || ierror != 0)
-         {
-            fprintf(STDERR, "\n Testing %s:", inname);
-#if PNG_DEBUG > 0
-            fprintf(STDERR, "\n");
-#endif
-         }
-
-         kerror = test_one_file(inname, outname);
-
-         if (kerror == 0)
-         {
-            if (verbose == 1 || i == 2)
-            {
-#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
-                fprintf(STDERR, "\n PASS (%lu zero samples)\n",
-                    (unsigned long)zero_samples);
-#else
-                fprintf(STDERR, " PASS\n");
-#endif
-#ifdef PNG_TIME_RFC1123_SUPPORTED
-             if (tIME_chunk_present != 0)
-                fprintf(STDERR, " tIME = %s\n", tIME_string);
-#endif /* TIME_RFC1123 */
-            }
-         }
-
-         else
-         {
-            if (verbose == 0 && i != 2)
-            {
-               fprintf(STDERR, "\n Testing %s:", inname);
-#if PNG_DEBUG > 0
-               fprintf(STDERR, "\n");
-#endif
-            }
-
-            if (xfail)
-              fprintf(STDERR, " XFAIL\n");
-            else
-            {
-              fprintf(STDERR, " FAIL\n");
-              ierror += kerror;
-            }
-         }
-#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
-         if (allocation_now != current_allocation)
-             fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
-                 current_allocation - allocation_now);
-
-         if (current_allocation != 0)
-         {
-             memory_infop pinfo = pinformation;
-
-             fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
-                 current_allocation);
-
-             while (pinfo != NULL)
-             {
-                fprintf(STDERR, " %lu bytes at %p\n",
-                    (unsigned long)pinfo->size, pinfo->pointer);
-                pinfo = pinfo->next;
-             }
-          }
-#endif
-       }
-#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
-       fprintf(STDERR, " Current memory allocation: %10d bytes\n",
-           current_allocation);
-       fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
-           maximum_allocation);
-       fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
-           total_allocation);
-       fprintf(STDERR, "     Number of allocations: %10d\n",
-           num_allocations);
-#endif
-   }
-
-#ifdef PNGTEST_TIMING
-   t_stop = (float)clock();
-   t_misc += (t_stop - t_start);
-   t_start = t_stop;
-   fprintf(STDERR, " CPU time used = %.3f seconds",
-       (t_misc+t_decode+t_encode)/(float)CLOCKS_PER_SEC);
-   fprintf(STDERR, " (decoding %.3f,\n",
-       t_decode/(float)CLOCKS_PER_SEC);
-   fprintf(STDERR, "        encoding %.3f ,",
-       t_encode/(float)CLOCKS_PER_SEC);
-   fprintf(STDERR, " other %.3f seconds)\n\n",
-       t_misc/(float)CLOCKS_PER_SEC);
-#endif
-
-   if (ierror == 0)
-      fprintf(STDERR, " libpng passes test\n");
-
-   else
-      fprintf(STDERR, " libpng FAILS test\n");
-
-   dummy_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-   fprintf(STDERR, " Default limits:\n");
-   fprintf(STDERR, "  width_max  = %lu\n",
-       (unsigned long) png_get_user_width_max(dummy_ptr));
-   fprintf(STDERR, "  height_max = %lu\n",
-       (unsigned long) png_get_user_height_max(dummy_ptr));
-   if (png_get_chunk_cache_max(dummy_ptr) == 0)
-      fprintf(STDERR, "  cache_max  = unlimited\n");
-   else
-      fprintf(STDERR, "  cache_max  = %lu\n",
-          (unsigned long) png_get_chunk_cache_max(dummy_ptr));
-   if (png_get_chunk_malloc_max(dummy_ptr) == 0)
-      fprintf(STDERR, "  malloc_max = unlimited\n");
-   else
-      fprintf(STDERR, "  malloc_max = %lu\n",
-          (unsigned long) png_get_chunk_malloc_max(dummy_ptr));
-   png_destroy_read_struct(&dummy_ptr, NULL, NULL);
-
-   return (int)(ierror != 0);
-}
-#else
-int
-main(void)
-{
-   fprintf(STDERR,
-       " test ignored because libpng was not built with read support\n");
-   /* And skip this test */
-   return PNG_LIBPNG_VER < 10600 ? 0 : 77;
-}
-#endif
-
-/* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_34 Your_png_h_is_not_version_1_6_34;
diff --git a/src/png/libpng/pngtrans.c b/src/png/libpng/pngtrans.c
deleted file mode 100644
index 6882f0fd7..000000000
--- a/src/png/libpng/pngtrans.c
+++ /dev/null
@@ -1,864 +0,0 @@
-
-/* pngtrans.c - transforms the data in a row (used by both readers and writers)
- *
- * Last changed in libpng 1.6.33 [September 28, 2017]
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#include "pngpriv.h"
-
-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-
-#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-/* Turn on BGR-to-RGB mapping */
-void PNGAPI
-png_set_bgr(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_bgr");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->transformations |= PNG_BGR;
-}
-#endif
-
-#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
-/* Turn on 16-bit byte swapping */
-void PNGAPI
-png_set_swap(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_swap");
-
-   if (png_ptr == NULL)
-      return;
-
-   if (png_ptr->bit_depth == 16)
-      png_ptr->transformations |= PNG_SWAP_BYTES;
-}
-#endif
-
-#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
-/* Turn on pixel packing */
-void PNGAPI
-png_set_packing(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_packing");
-
-   if (png_ptr == NULL)
-      return;
-
-   if (png_ptr->bit_depth < 8)
-   {
-      png_ptr->transformations |= PNG_PACK;
-#     ifdef PNG_WRITE_SUPPORTED
-         png_ptr->usr_bit_depth = 8;
-#     endif
-   }
-}
-#endif
-
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-/* Turn on packed pixel swapping */
-void PNGAPI
-png_set_packswap(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_packswap");
-
-   if (png_ptr == NULL)
-      return;
-
-   if (png_ptr->bit_depth < 8)
-      png_ptr->transformations |= PNG_PACKSWAP;
-}
-#endif
-
-#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
-void PNGAPI
-png_set_shift(png_structrp png_ptr, png_const_color_8p true_bits)
-{
-   png_debug(1, "in png_set_shift");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->transformations |= PNG_SHIFT;
-   png_ptr->shift = *true_bits;
-}
-#endif
-
-#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
-    defined(PNG_WRITE_INTERLACING_SUPPORTED)
-int PNGAPI
-png_set_interlace_handling(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_interlace handling");
-
-   if (png_ptr != 0 && png_ptr->interlaced != 0)
-   {
-      png_ptr->transformations |= PNG_INTERLACE;
-      return (7);
-   }
-
-   return (1);
-}
-#endif
-
-#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
-/* Add a filler byte on read, or remove a filler or alpha byte on write.
- * The filler type has changed in v0.95 to allow future 2-byte fillers
- * for 48-bit input data, as well as to avoid problems with some compilers
- * that don't like bytes as parameters.
- */
-void PNGAPI
-png_set_filler(png_structrp png_ptr, png_uint_32 filler, int filler_loc)
-{
-   png_debug(1, "in png_set_filler");
-
-   if (png_ptr == NULL)
-      return;
-
-   /* In libpng 1.6 it is possible to determine whether this is a read or write
-    * operation and therefore to do more checking here for a valid call.
-    */
-   if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
-   {
-#     ifdef PNG_READ_FILLER_SUPPORTED
-         /* On read png_set_filler is always valid, regardless of the base PNG
-          * format, because other transformations can give a format where the
-          * filler code can execute (basically an 8 or 16-bit component RGB or G
-          * format.)
-          *
-          * NOTE: usr_channels is not used by the read code!  (This has led to
-          * confusion in the past.)  The filler is only used in the read code.
-          */
-         png_ptr->filler = (png_uint_16)filler;
-#     else
-         png_app_error(png_ptr, "png_set_filler not supported on read");
-         PNG_UNUSED(filler) /* not used in the write case */
-         return;
-#     endif
-   }
-
-   else /* write */
-   {
-#     ifdef PNG_WRITE_FILLER_SUPPORTED
-         /* On write the usr_channels parameter must be set correctly at the
-          * start to record the number of channels in the app-supplied data.
-          */
-         switch (png_ptr->color_type)
-         {
-            case PNG_COLOR_TYPE_RGB:
-               png_ptr->usr_channels = 4;
-               break;
-
-            case PNG_COLOR_TYPE_GRAY:
-               if (png_ptr->bit_depth >= 8)
-               {
-                  png_ptr->usr_channels = 2;
-                  break;
-               }
-
-               else
-               {
-                  /* There simply isn't any code in libpng to strip out bits
-                   * from bytes when the components are less than a byte in
-                   * size!
-                   */
-                  png_app_error(png_ptr,
-                      "png_set_filler is invalid for"
-                      " low bit depth gray output");
-                  return;
-               }
-
-            default:
-               png_app_error(png_ptr,
-                   "png_set_filler: inappropriate color type");
-               return;
-         }
-#     else
-         png_app_error(png_ptr, "png_set_filler not supported on write");
-         return;
-#     endif
-   }
-
-   /* Here on success - libpng supports the operation, set the transformation
-    * and the flag to say where the filler channel is.
-    */
-   png_ptr->transformations |= PNG_FILLER;
-
-   if (filler_loc == PNG_FILLER_AFTER)
-      png_ptr->flags |= PNG_FLAG_FILLER_AFTER;
-
-   else
-      png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;
-}
-
-/* Added to libpng-1.2.7 */
-void PNGAPI
-png_set_add_alpha(png_structrp png_ptr, png_uint_32 filler, int filler_loc)
-{
-   png_debug(1, "in png_set_add_alpha");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_set_filler(png_ptr, filler, filler_loc);
-   /* The above may fail to do anything. */
-   if ((png_ptr->transformations & PNG_FILLER) != 0)
-      png_ptr->transformations |= PNG_ADD_ALPHA;
-}
-
-#endif
-
-#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
-    defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-void PNGAPI
-png_set_swap_alpha(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_swap_alpha");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->transformations |= PNG_SWAP_ALPHA;
-}
-#endif
-
-#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
-    defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-void PNGAPI
-png_set_invert_alpha(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_invert_alpha");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->transformations |= PNG_INVERT_ALPHA;
-}
-#endif
-
-#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
-void PNGAPI
-png_set_invert_mono(png_structrp png_ptr)
-{
-   png_debug(1, "in png_set_invert_mono");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->transformations |= PNG_INVERT_MONO;
-}
-
-/* Invert monochrome grayscale data */
-void /* PRIVATE */
-png_do_invert(png_row_infop row_info, png_bytep row)
-{
-   png_debug(1, "in png_do_invert");
-
-  /* This test removed from libpng version 1.0.13 and 1.2.0:
-   *   if (row_info->bit_depth == 1 &&
-   */
-   if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
-   {
-      png_bytep rp = row;
-      png_size_t i;
-      png_size_t istop = row_info->rowbytes;
-
-      for (i = 0; i < istop; i++)
-      {
-         *rp = (png_byte)(~(*rp));
-         rp++;
-      }
-   }
-
-   else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
-      row_info->bit_depth == 8)
-   {
-      png_bytep rp = row;
-      png_size_t i;
-      png_size_t istop = row_info->rowbytes;
-
-      for (i = 0; i < istop; i += 2)
-      {
-         *rp = (png_byte)(~(*rp));
-         rp += 2;
-      }
-   }
-
-#ifdef PNG_16BIT_SUPPORTED
-   else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
-      row_info->bit_depth == 16)
-   {
-      png_bytep rp = row;
-      png_size_t i;
-      png_size_t istop = row_info->rowbytes;
-
-      for (i = 0; i < istop; i += 4)
-      {
-         *rp = (png_byte)(~(*rp));
-         *(rp + 1) = (png_byte)(~(*(rp + 1)));
-         rp += 4;
-      }
-   }
-#endif
-}
-#endif
-
-#ifdef PNG_16BIT_SUPPORTED
-#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
-/* Swaps byte order on 16-bit depth images */
-void /* PRIVATE */
-png_do_swap(png_row_infop row_info, png_bytep row)
-{
-   png_debug(1, "in png_do_swap");
-
-   if (row_info->bit_depth == 16)
-   {
-      png_bytep rp = row;
-      png_uint_32 i;
-      png_uint_32 istop= row_info->width * row_info->channels;
-
-      for (i = 0; i < istop; i++, rp += 2)
-      {
-#ifdef PNG_BUILTIN_BSWAP16_SUPPORTED
-         /* Feature added to libpng-1.6.11 for testing purposes, not
-          * enabled by default.
-          */
-         *(png_uint_16*)rp = __builtin_bswap16(*(png_uint_16*)rp);
-#else
-         png_byte t = *rp;
-         *rp = *(rp + 1);
-         *(rp + 1) = t;
-#endif
-      }
-   }
-}
-#endif
-#endif
-
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-static PNG_CONST png_byte onebppswaptable[256] = {
-   0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
-   0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
-   0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
-   0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
-   0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
-   0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
-   0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
-   0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
-   0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
-   0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
-   0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
-   0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
-   0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
-   0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
-   0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
-   0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
-   0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
-   0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
-   0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
-   0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
-   0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
-   0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
-   0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
-   0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
-   0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
-   0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
-   0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
-   0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
-   0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
-   0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
-   0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
-   0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
-};
-
-static PNG_CONST png_byte twobppswaptable[256] = {
-   0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0,
-   0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0,
-   0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4,
-   0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4,
-   0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8,
-   0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8,
-   0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC,
-   0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC,
-   0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1,
-   0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1,
-   0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5,
-   0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5,
-   0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9,
-   0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9,
-   0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD,
-   0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD,
-   0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2,
-   0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2,
-   0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6,
-   0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6,
-   0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA,
-   0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA,
-   0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE,
-   0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE,
-   0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3,
-   0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3,
-   0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7,
-   0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7,
-   0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB,
-   0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB,
-   0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF,
-   0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF
-};
-
-static PNG_CONST png_byte fourbppswaptable[256] = {
-   0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,
-   0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0,
-   0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71,
-   0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1,
-   0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72,
-   0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2,
-   0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73,
-   0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3,
-   0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74,
-   0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4,
-   0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75,
-   0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5,
-   0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76,
-   0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6,
-   0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77,
-   0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7,
-   0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78,
-   0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8,
-   0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79,
-   0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9,
-   0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A,
-   0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA,
-   0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B,
-   0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB,
-   0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C,
-   0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC,
-   0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D,
-   0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD,
-   0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E,
-   0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE,
-   0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F,
-   0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF
-};
-
-/* Swaps pixel packing order within bytes */
-void /* PRIVATE */
-png_do_packswap(png_row_infop row_info, png_bytep row)
-{
-   png_debug(1, "in png_do_packswap");
-
-   if (row_info->bit_depth < 8)
-   {
-      png_bytep rp;
-      png_const_bytep end, table;
-
-      end = row + row_info->rowbytes;
-
-      if (row_info->bit_depth == 1)
-         table = onebppswaptable;
-
-      else if (row_info->bit_depth == 2)
-         table = twobppswaptable;
-
-      else if (row_info->bit_depth == 4)
-         table = fourbppswaptable;
-
-      else
-         return;
-
-      for (rp = row; rp < end; rp++)
-         *rp = table[*rp];
-   }
-}
-#endif /* PACKSWAP || WRITE_PACKSWAP */
-
-#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
-    defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-/* Remove a channel - this used to be 'png_do_strip_filler' but it used a
- * somewhat weird combination of flags to determine what to do.  All the calls
- * to png_do_strip_filler are changed in 1.5.2 to call this instead with the
- * correct arguments.
- *
- * The routine isn't general - the channel must be the channel at the start or
- * end (not in the middle) of each pixel.
- */
-void /* PRIVATE */
-png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
-{
-   png_bytep sp = row; /* source pointer */
-   png_bytep dp = row; /* destination pointer */
-   png_bytep ep = row + row_info->rowbytes; /* One beyond end of row */
-
-   /* At the start sp will point to the first byte to copy and dp to where
-    * it is copied to.  ep always points just beyond the end of the row, so
-    * the loop simply copies (channels-1) channels until sp reaches ep.
-    *
-    * at_start:        0 -- convert AG, XG, ARGB, XRGB, AAGG, XXGG, etc.
-    *            nonzero -- convert GA, GX, RGBA, RGBX, GGAA, RRGGBBXX, etc.
-    */
-
-   /* GA, GX, XG cases */
-   if (row_info->channels == 2)
-   {
-      if (row_info->bit_depth == 8)
-      {
-         if (at_start != 0) /* Skip initial filler */
-            ++sp;
-         else          /* Skip initial channel and, for sp, the filler */
-         {
-            sp += 2; ++dp;
-         }
-
-         /* For a 1 pixel wide image there is nothing to do */
-         while (sp < ep)
-         {
-            *dp++ = *sp; sp += 2;
-         }
-
-         row_info->pixel_depth = 8;
-      }
-
-      else if (row_info->bit_depth == 16)
-      {
-         if (at_start != 0) /* Skip initial filler */
-            sp += 2;
-         else          /* Skip initial channel and, for sp, the filler */
-         {
-            sp += 4; dp += 2;
-         }
-
-         while (sp < ep)
-         {
-            *dp++ = *sp++; *dp++ = *sp; sp += 3;
-         }
-
-         row_info->pixel_depth = 16;
-      }
-
-      else
-         return; /* bad bit depth */
-
-      row_info->channels = 1;
-
-      /* Finally fix the color type if it records an alpha channel */
-      if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
-         row_info->color_type = PNG_COLOR_TYPE_GRAY;
-   }
-
-   /* RGBA, RGBX, XRGB cases */
-   else if (row_info->channels == 4)
-   {
-      if (row_info->bit_depth == 8)
-      {
-         if (at_start != 0) /* Skip initial filler */
-            ++sp;
-         else          /* Skip initial channels and, for sp, the filler */
-         {
-            sp += 4; dp += 3;
-         }
-
-         /* Note that the loop adds 3 to dp and 4 to sp each time. */
-         while (sp < ep)
-         {
-            *dp++ = *sp++; *dp++ = *sp++; *dp++ = *sp; sp += 2;
-         }
-
-         row_info->pixel_depth = 24;
-      }
-
-      else if (row_info->bit_depth == 16)
-      {
-         if (at_start != 0) /* Skip initial filler */
-            sp += 2;
-         else          /* Skip initial channels and, for sp, the filler */
-         {
-            sp += 8; dp += 6;
-         }
-
-         while (sp < ep)
-         {
-            /* Copy 6 bytes, skip 2 */
-            *dp++ = *sp++; *dp++ = *sp++;
-            *dp++ = *sp++; *dp++ = *sp++;
-            *dp++ = *sp++; *dp++ = *sp; sp += 3;
-         }
-
-         row_info->pixel_depth = 48;
-      }
-
-      else
-         return; /* bad bit depth */
-
-      row_info->channels = 3;
-
-      /* Finally fix the color type if it records an alpha channel */
-      if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
-         row_info->color_type = PNG_COLOR_TYPE_RGB;
-   }
-
-   else
-      return; /* The filler channel has gone already */
-
-   /* Fix the rowbytes value. */
-   row_info->rowbytes = (png_size_t)(dp-row);
-}
-#endif
-
-#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-/* Swaps red and blue bytes within a pixel */
-void /* PRIVATE */
-png_do_bgr(png_row_infop row_info, png_bytep row)
-{
-   png_debug(1, "in png_do_bgr");
-
-   if ((row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
-   {
-      png_uint_32 row_width = row_info->width;
-      if (row_info->bit_depth == 8)
-      {
-         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
-         {
-            png_bytep rp;
-            png_uint_32 i;
-
-            for (i = 0, rp = row; i < row_width; i++, rp += 3)
-            {
-               png_byte save = *rp;
-               *rp = *(rp + 2);
-               *(rp + 2) = save;
-            }
-         }
-
-         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
-         {
-            png_bytep rp;
-            png_uint_32 i;
-
-            for (i = 0, rp = row; i < row_width; i++, rp += 4)
-            {
-               png_byte save = *rp;
-               *rp = *(rp + 2);
-               *(rp + 2) = save;
-            }
-         }
-      }
-
-#ifdef PNG_16BIT_SUPPORTED
-      else if (row_info->bit_depth == 16)
-      {
-         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
-         {
-            png_bytep rp;
-            png_uint_32 i;
-
-            for (i = 0, rp = row; i < row_width; i++, rp += 6)
-            {
-               png_byte save = *rp;
-               *rp = *(rp + 4);
-               *(rp + 4) = save;
-               save = *(rp + 1);
-               *(rp + 1) = *(rp + 5);
-               *(rp + 5) = save;
-            }
-         }
-
-         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
-         {
-            png_bytep rp;
-            png_uint_32 i;
-
-            for (i = 0, rp = row; i < row_width; i++, rp += 8)
-            {
-               png_byte save = *rp;
-               *rp = *(rp + 4);
-               *(rp + 4) = save;
-               save = *(rp + 1);
-               *(rp + 1) = *(rp + 5);
-               *(rp + 5) = save;
-            }
-         }
-      }
-#endif
-   }
-}
-#endif /* READ_BGR || WRITE_BGR */
-
-#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
-    defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
-/* Added at libpng-1.5.10 */
-void /* PRIVATE */
-png_do_check_palette_indexes(png_structrp png_ptr, png_row_infop row_info)
-{
-   if (png_ptr->num_palette < (1 << row_info->bit_depth) &&
-      png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */
-   {
-      /* Calculations moved outside switch in an attempt to stop different
-       * compiler warnings.  'padding' is in *bits* within the last byte, it is
-       * an 'int' because pixel_depth becomes an 'int' in the expression below,
-       * and this calculation is used because it avoids warnings that other
-       * forms produced on either GCC or MSVC.
-       */
-      int padding = PNG_PADBITS(row_info->pixel_depth, row_info->width);
-      png_bytep rp = png_ptr->row_buf + row_info->rowbytes - 1;
-
-      switch (row_info->bit_depth)
-      {
-         case 1:
-         {
-            /* in this case, all bytes must be 0 so we don't need
-             * to unpack the pixels except for the rightmost one.
-             */
-            for (; rp > png_ptr->row_buf; rp--)
-            {
-              if ((*rp >> padding) != 0)
-                 png_ptr->num_palette_max = 1;
-              padding = 0;
-            }
-
-            break;
-         }
-
-         case 2:
-         {
-            for (; rp > png_ptr->row_buf; rp--)
-            {
-              int i = ((*rp >> padding) & 0x03);
-
-              if (i > png_ptr->num_palette_max)
-                 png_ptr->num_palette_max = i;
-
-              i = (((*rp >> padding) >> 2) & 0x03);
-
-              if (i > png_ptr->num_palette_max)
-                 png_ptr->num_palette_max = i;
-
-              i = (((*rp >> padding) >> 4) & 0x03);
-
-              if (i > png_ptr->num_palette_max)
-                 png_ptr->num_palette_max = i;
-
-              i = (((*rp >> padding) >> 6) & 0x03);
-
-              if (i > png_ptr->num_palette_max)
-                 png_ptr->num_palette_max = i;
-
-              padding = 0;
-            }
-
-            break;
-         }
-
-         case 4:
-         {
-            for (; rp > png_ptr->row_buf; rp--)
-            {
-              int i = ((*rp >> padding) & 0x0f);
-
-              if (i > png_ptr->num_palette_max)
-                 png_ptr->num_palette_max = i;
-
-              i = (((*rp >> padding) >> 4) & 0x0f);
-
-              if (i > png_ptr->num_palette_max)
-                 png_ptr->num_palette_max = i;
-
-              padding = 0;
-            }
-
-            break;
-         }
-
-         case 8:
-         {
-            for (; rp > png_ptr->row_buf; rp--)
-            {
-               if (*rp > png_ptr->num_palette_max)
-                  png_ptr->num_palette_max = (int) *rp;
-            }
-
-            break;
-         }
-
-         default:
-            break;
-      }
-   }
-}
-#endif /* CHECK_FOR_INVALID_INDEX */
-
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
-void PNGAPI
-png_set_user_transform_info(png_structrp png_ptr, png_voidp
-   user_transform_ptr, int user_transform_depth, int user_transform_channels)
-{
-   png_debug(1, "in png_set_user_transform_info");
-
-   if (png_ptr == NULL)
-      return;
-
-#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
-   if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
-      (png_ptr->flags & PNG_FLAG_ROW_INIT) != 0)
-   {
-      png_app_error(png_ptr,
-          "info change after png_start_read_image or png_read_update_info");
-      return;
-   }
-#endif
-
-   png_ptr->user_transform_ptr = user_transform_ptr;
-   png_ptr->user_transform_depth = (png_byte)user_transform_depth;
-   png_ptr->user_transform_channels = (png_byte)user_transform_channels;
-}
-#endif
-
-/* This function returns a pointer to the user_transform_ptr associated with
- * the user transform functions.  The application should free any memory
- * associated with this pointer before png_write_destroy and png_read_destroy
- * are called.
- */
-#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
-png_voidp PNGAPI
-png_get_user_transform_ptr(png_const_structrp png_ptr)
-{
-   if (png_ptr == NULL)
-      return (NULL);
-
-   return png_ptr->user_transform_ptr;
-}
-#endif
-
-#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED
-png_uint_32 PNGAPI
-png_get_current_row_number(png_const_structrp png_ptr)
-{
-   /* See the comments in png.h - this is the sub-image row when reading an
-    * interlaced image.
-    */
-   if (png_ptr != NULL)
-      return png_ptr->row_number;
-
-   return PNG_UINT_32_MAX; /* help the app not to fail silently */
-}
-
-png_byte PNGAPI
-png_get_current_pass_number(png_const_structrp png_ptr)
-{
-   if (png_ptr != NULL)
-      return png_ptr->pass;
-   return 8; /* invalid */
-}
-#endif /* USER_TRANSFORM_INFO */
-#endif /* READ_USER_TRANSFORM || WRITE_USER_TRANSFORM */
-#endif /* READ || WRITE */
diff --git a/src/png/libpng/pngusr.dfa b/src/png/libpng/pngusr.dfa
deleted file mode 100644
index 83067c38c..000000000
--- a/src/png/libpng/pngusr.dfa
+++ /dev/null
@@ -1,14 +0,0 @@
-# pngusr.dfa
-#
-# Build time configuration of libpng
-#
-# Enter build configuration options in this file
-#
-# Security settings: by default these limits are unset, you can change them
-# here by entering the appropriate values as #defines preceded by '@' (to cause,
-# them to be passed through to the build of pnglibconf.h), for example:
-#
-# @# define PNG_USER_WIDTH_MAX 65535
-# @# define PNG_USER_HEIGHT_MAX 65535
-# @# define PNG_USER_CHUNK_CACHE_MAX 256
-# @# define PNG_USER_CHUNK_MALLOC_MAX 640000
diff --git a/src/png/libpng/pngwio.c b/src/png/libpng/pngwio.c
deleted file mode 100644
index 37c7c3a7f..000000000
--- a/src/png/libpng/pngwio.c
+++ /dev/null
@@ -1,168 +0,0 @@
-
-/* pngwio.c - functions for data output
- *
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2014,2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * This file provides a location for all output.  Users who need
- * special handling are expected to write functions that have the same
- * arguments as these and perform similar functions, but that possibly
- * use different output methods.  Note that you shouldn't change these
- * functions, but rather write replacement functions and then change
- * them at run time with png_set_write_fn(...).
- */
-
-#include "pngpriv.h"
-
-#ifdef PNG_WRITE_SUPPORTED
-
-/* Write the data to whatever output you are using.  The default routine
- * writes to a file pointer.  Note that this routine sometimes gets called
- * with very small lengths, so you should implement some kind of simple
- * buffering if you are using unbuffered writes.  This should never be asked
- * to write more than 64K on a 16-bit machine.
- */
-
-void /* PRIVATE */
-png_write_data(png_structrp png_ptr, png_const_bytep data, png_size_t length)
-{
-   /* NOTE: write_data_fn must not change the buffer! */
-   if (png_ptr->write_data_fn != NULL )
-      (*(png_ptr->write_data_fn))(png_ptr, png_constcast(png_bytep,data),
-          length);
-
-   else
-      png_error(png_ptr, "Call to NULL write function");
-}
-
-#ifdef PNG_STDIO_SUPPORTED
-/* This is the function that does the actual writing of data.  If you are
- * not writing to a standard C stream, you should create a replacement
- * write_data function and use it at run time with png_set_write_fn(), rather
- * than changing the library.
- */
-void PNGCBAPI
-png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
-{
-   png_size_t check;
-
-   if (png_ptr == NULL)
-      return;
-
-   check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
-
-   if (check != length)
-      png_error(png_ptr, "Write Error");
-}
-#endif
-
-/* This function is called to output any data pending writing (normally
- * to disk).  After png_flush is called, there should be no data pending
- * writing in any buffers.
- */
-#ifdef PNG_WRITE_FLUSH_SUPPORTED
-void /* PRIVATE */
-png_flush(png_structrp png_ptr)
-{
-   if (png_ptr->output_flush_fn != NULL)
-      (*(png_ptr->output_flush_fn))(png_ptr);
-}
-
-#  ifdef PNG_STDIO_SUPPORTED
-void PNGCBAPI
-png_default_flush(png_structp png_ptr)
-{
-   png_FILE_p io_ptr;
-
-   if (png_ptr == NULL)
-      return;
-
-   io_ptr = png_voidcast(png_FILE_p, (png_ptr->io_ptr));
-   fflush(io_ptr);
-}
-#  endif
-#endif
-
-/* This function allows the application to supply new output functions for
- * libpng if standard C streams aren't being used.
- *
- * This function takes as its arguments:
- * png_ptr       - pointer to a png output data structure
- * io_ptr        - pointer to user supplied structure containing info about
- *                 the output functions.  May be NULL.
- * write_data_fn - pointer to a new output function that takes as its
- *                 arguments a pointer to a png_struct, a pointer to
- *                 data to be written, and a 32-bit unsigned int that is
- *                 the number of bytes to be written.  The new write
- *                 function should call png_error(png_ptr, "Error msg")
- *                 to exit and output any fatal error messages.  May be
- *                 NULL, in which case libpng's default function will
- *                 be used.
- * flush_data_fn - pointer to a new flush function that takes as its
- *                 arguments a pointer to a png_struct.  After a call to
- *                 the flush function, there should be no data in any buffers
- *                 or pending transmission.  If the output method doesn't do
- *                 any buffering of output, a function prototype must still be
- *                 supplied although it doesn't have to do anything.  If
- *                 PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
- *                 time, output_flush_fn will be ignored, although it must be
- *                 supplied for compatibility.  May be NULL, in which case
- *                 libpng's default function will be used, if
- *                 PNG_WRITE_FLUSH_SUPPORTED is defined.  This is not
- *                 a good idea if io_ptr does not point to a standard
- *                 *FILE structure.
- */
-void PNGAPI
-png_set_write_fn(png_structrp png_ptr, png_voidp io_ptr,
-    png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
-{
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->io_ptr = io_ptr;
-
-#ifdef PNG_STDIO_SUPPORTED
-   if (write_data_fn != NULL)
-      png_ptr->write_data_fn = write_data_fn;
-
-   else
-      png_ptr->write_data_fn = png_default_write_data;
-#else
-   png_ptr->write_data_fn = write_data_fn;
-#endif
-
-#ifdef PNG_WRITE_FLUSH_SUPPORTED
-#  ifdef PNG_STDIO_SUPPORTED
-
-   if (output_flush_fn != NULL)
-      png_ptr->output_flush_fn = output_flush_fn;
-
-   else
-      png_ptr->output_flush_fn = png_default_flush;
-
-#  else
-   png_ptr->output_flush_fn = output_flush_fn;
-#  endif
-#else
-   PNG_UNUSED(output_flush_fn)
-#endif /* WRITE_FLUSH */
-
-#ifdef PNG_READ_SUPPORTED
-   /* It is an error to read while writing a png file */
-   if (png_ptr->read_data_fn != NULL)
-   {
-      png_ptr->read_data_fn = NULL;
-
-      png_warning(png_ptr,
-          "Can't set both read_data_fn and write_data_fn in the"
-          " same structure");
-   }
-#endif
-}
-#endif /* WRITE */
diff --git a/src/png/libpng/pngwrite.c b/src/png/libpng/pngwrite.c
deleted file mode 100644
index a16d77ce0..000000000
--- a/src/png/libpng/pngwrite.c
+++ /dev/null
@@ -1,2396 +0,0 @@
-
-/* pngwrite.c - general routines to write a PNG file
- *
- * Last changed in libpng 1.6.32 [August 24, 2017]
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#include "pngpriv.h"
-#ifdef PNG_SIMPLIFIED_WRITE_STDIO_SUPPORTED
-#  include <errno.h>
-#endif /* SIMPLIFIED_WRITE_STDIO */
-
-#ifdef PNG_WRITE_SUPPORTED
-
-#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-/* Write out all the unknown chunks for the current given location */
-static void
-write_unknown_chunks(png_structrp png_ptr, png_const_inforp info_ptr,
-    unsigned int where)
-{
-   if (info_ptr->unknown_chunks_num != 0)
-   {
-      png_const_unknown_chunkp up;
-
-      png_debug(5, "writing extra chunks");
-
-      for (up = info_ptr->unknown_chunks;
-           up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
-           ++up)
-         if ((up->location & where) != 0)
-      {
-         /* If per-chunk unknown chunk handling is enabled use it, otherwise
-          * just write the chunks the application has set.
-          */
-#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
-         int keep = png_handle_as_unknown(png_ptr, up->name);
-
-         /* NOTE: this code is radically different from the read side in the
-          * matter of handling an ancillary unknown chunk.  In the read side
-          * the default behavior is to discard it, in the code below the default
-          * behavior is to write it.  Critical chunks are, however, only
-          * written if explicitly listed or if the default is set to write all
-          * unknown chunks.
-          *
-          * The default handling is also slightly weird - it is not possible to
-          * stop the writing of all unsafe-to-copy chunks!
-          *
-          * TODO: REVIEW: this would seem to be a bug.
-          */
-         if (keep != PNG_HANDLE_CHUNK_NEVER &&
-             ((up->name[3] & 0x20) /* safe-to-copy overrides everything */ ||
-              keep == PNG_HANDLE_CHUNK_ALWAYS ||
-              (keep == PNG_HANDLE_CHUNK_AS_DEFAULT &&
-               png_ptr->unknown_default == PNG_HANDLE_CHUNK_ALWAYS)))
-#endif
-         {
-            /* TODO: review, what is wrong with a zero length unknown chunk? */
-            if (up->size == 0)
-               png_warning(png_ptr, "Writing zero-length unknown chunk");
-
-            png_write_chunk(png_ptr, up->name, up->data, up->size);
-         }
-      }
-   }
-}
-#endif /* WRITE_UNKNOWN_CHUNKS */
-
-/* Writes all the PNG information.  This is the suggested way to use the
- * library.  If you have a new chunk to add, make a function to write it,
- * and put it in the correct location here.  If you want the chunk written
- * after the image data, put it in png_write_end().  I strongly encourage
- * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
- * the chunk, as that will keep the code from breaking if you want to just
- * write a plain PNG file.  If you have long comments, I suggest writing
- * them in png_write_end(), and compressing them.
- */
-void PNGAPI
-png_write_info_before_PLTE(png_structrp png_ptr, png_const_inforp info_ptr)
-{
-   png_debug(1, "in png_write_info_before_PLTE");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   if ((png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE) == 0)
-   {
-      /* Write PNG signature */
-      png_write_sig(png_ptr);
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-      if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) != 0 && \
-          png_ptr->mng_features_permitted != 0)
-      {
-         png_warning(png_ptr,
-             "MNG features are not allowed in a PNG datastream");
-         png_ptr->mng_features_permitted = 0;
-      }
-#endif
-
-      /* Write IHDR information. */
-      png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
-          info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
-          info_ptr->filter_type,
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED
-          info_ptr->interlace_type
-#else
-          0
-#endif
-         );
-
-      /* The rest of these check to see if the valid field has the appropriate
-       * flag set, and if it does, writes the chunk.
-       *
-       * 1.6.0: COLORSPACE support controls the writing of these chunks too, and
-       * the chunks will be written if the WRITE routine is there and
-       * information * is available in the COLORSPACE. (See
-       * png_colorspace_sync_info in png.c for where the valid flags get set.)
-       *
-       * Under certain circumstances the colorspace can be invalidated without
-       * syncing the info_struct 'valid' flags; this happens if libpng detects
-       * an error and calls png_error while the color space is being set, yet
-       * the application continues writing the PNG.  So check the 'invalid'
-       * flag here too.
-       */
-#ifdef PNG_GAMMA_SUPPORTED
-#  ifdef PNG_WRITE_gAMA_SUPPORTED
-      if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
-          (info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_gAMA) != 0 &&
-          (info_ptr->valid & PNG_INFO_gAMA) != 0)
-         png_write_gAMA_fixed(png_ptr, info_ptr->colorspace.gamma);
-#  endif
-#endif
-
-#ifdef PNG_COLORSPACE_SUPPORTED
-      /* Write only one of sRGB or an ICC profile.  If a profile was supplied
-       * and it matches one of the known sRGB ones issue a warning.
-       */
-#  ifdef PNG_WRITE_iCCP_SUPPORTED
-         if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
-             (info_ptr->valid & PNG_INFO_iCCP) != 0)
-         {
-#    ifdef PNG_WRITE_sRGB_SUPPORTED
-               if ((info_ptr->valid & PNG_INFO_sRGB) != 0)
-                  png_app_warning(png_ptr,
-                      "profile matches sRGB but writing iCCP instead");
-#     endif
-
-            png_write_iCCP(png_ptr, info_ptr->iccp_name,
-                info_ptr->iccp_profile);
-         }
-#     ifdef PNG_WRITE_sRGB_SUPPORTED
-         else
-#     endif
-#  endif
-
-#  ifdef PNG_WRITE_sRGB_SUPPORTED
-         if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
-             (info_ptr->valid & PNG_INFO_sRGB) != 0)
-            png_write_sRGB(png_ptr, info_ptr->colorspace.rendering_intent);
-#  endif /* WRITE_sRGB */
-#endif /* COLORSPACE */
-
-#ifdef PNG_WRITE_sBIT_SUPPORTED
-         if ((info_ptr->valid & PNG_INFO_sBIT) != 0)
-            png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
-#endif
-
-#ifdef PNG_COLORSPACE_SUPPORTED
-#  ifdef PNG_WRITE_cHRM_SUPPORTED
-         if ((info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) == 0 &&
-             (info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) != 0 &&
-             (info_ptr->valid & PNG_INFO_cHRM) != 0)
-            png_write_cHRM_fixed(png_ptr, &info_ptr->colorspace.end_points_xy);
-#  endif
-#endif
-
-#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-         write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_IHDR);
-#endif
-
-      png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
-   }
-}
-
-void PNGAPI
-png_write_info(png_structrp png_ptr, png_const_inforp info_ptr)
-{
-#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
-   int i;
-#endif
-
-   png_debug(1, "in png_write_info");
-
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   png_write_info_before_PLTE(png_ptr, info_ptr);
-
-   if ((info_ptr->valid & PNG_INFO_PLTE) != 0)
-      png_write_PLTE(png_ptr, info_ptr->palette,
-          (png_uint_32)info_ptr->num_palette);
-
-   else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      png_error(png_ptr, "Valid palette required for paletted images");
-
-#ifdef PNG_WRITE_tRNS_SUPPORTED
-   if ((info_ptr->valid & PNG_INFO_tRNS) !=0)
-   {
-#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
-      /* Invert the alpha channel (in tRNS) */
-      if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0 &&
-          info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      {
-         int j, jend;
-
-         jend = info_ptr->num_trans;
-         if (jend > PNG_MAX_PALETTE_LENGTH)
-            jend = PNG_MAX_PALETTE_LENGTH;
-
-         for (j = 0; j<jend; ++j)
-            info_ptr->trans_alpha[j] =
-               (png_byte)(255 - info_ptr->trans_alpha[j]);
-      }
-#endif
-      png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color),
-          info_ptr->num_trans, info_ptr->color_type);
-   }
-#endif
-#ifdef PNG_WRITE_bKGD_SUPPORTED
-   if ((info_ptr->valid & PNG_INFO_bKGD) != 0)
-      png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
-#endif
-
-#ifdef PNG_WRITE_eXIf_SUPPORTED
-   if ((info_ptr->valid & PNG_INFO_eXIf) != 0)
-      png_write_eXIf(png_ptr, info_ptr->exif, info_ptr->num_exif);
-#endif
-
-#ifdef PNG_WRITE_hIST_SUPPORTED
-   if ((info_ptr->valid & PNG_INFO_hIST) != 0)
-      png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
-#endif
-
-#ifdef PNG_WRITE_oFFs_SUPPORTED
-   if ((info_ptr->valid & PNG_INFO_oFFs) != 0)
-      png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
-          info_ptr->offset_unit_type);
-#endif
-
-#ifdef PNG_WRITE_pCAL_SUPPORTED
-   if ((info_ptr->valid & PNG_INFO_pCAL) != 0)
-      png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
-          info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
-          info_ptr->pcal_units, info_ptr->pcal_params);
-#endif
-
-#ifdef PNG_WRITE_sCAL_SUPPORTED
-   if ((info_ptr->valid & PNG_INFO_sCAL) != 0)
-      png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
-          info_ptr->scal_s_width, info_ptr->scal_s_height);
-#endif /* sCAL */
-
-#ifdef PNG_WRITE_pHYs_SUPPORTED
-   if ((info_ptr->valid & PNG_INFO_pHYs) != 0)
-      png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
-          info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
-#endif /* pHYs */
-
-#ifdef PNG_WRITE_tIME_SUPPORTED
-   if ((info_ptr->valid & PNG_INFO_tIME) != 0)
-   {
-      png_write_tIME(png_ptr, &(info_ptr->mod_time));
-      png_ptr->mode |= PNG_WROTE_tIME;
-   }
-#endif /* tIME */
-
-#ifdef PNG_WRITE_sPLT_SUPPORTED
-   if ((info_ptr->valid & PNG_INFO_sPLT) != 0)
-      for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
-         png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
-#endif /* sPLT */
-
-#ifdef PNG_WRITE_TEXT_SUPPORTED
-   /* Check to see if we need to write text chunks */
-   for (i = 0; i < info_ptr->num_text; i++)
-   {
-      png_debug2(2, "Writing header text chunk %d, type %d", i,
-          info_ptr->text[i].compression);
-      /* An internationalized chunk? */
-      if (info_ptr->text[i].compression > 0)
-      {
-#ifdef PNG_WRITE_iTXt_SUPPORTED
-         /* Write international chunk */
-         png_write_iTXt(png_ptr,
-             info_ptr->text[i].compression,
-             info_ptr->text[i].key,
-             info_ptr->text[i].lang,
-             info_ptr->text[i].lang_key,
-             info_ptr->text[i].text);
-         /* Mark this chunk as written */
-         if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
-            info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
-         else
-            info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
-#else
-         png_warning(png_ptr, "Unable to write international text");
-#endif
-      }
-
-      /* If we want a compressed text chunk */
-      else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
-      {
-#ifdef PNG_WRITE_zTXt_SUPPORTED
-         /* Write compressed chunk */
-         png_write_zTXt(png_ptr, info_ptr->text[i].key,
-             info_ptr->text[i].text, info_ptr->text[i].compression);
-         /* Mark this chunk as written */
-         info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
-#else
-         png_warning(png_ptr, "Unable to write compressed text");
-#endif
-      }
-
-      else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
-      {
-#ifdef PNG_WRITE_tEXt_SUPPORTED
-         /* Write uncompressed chunk */
-         png_write_tEXt(png_ptr, info_ptr->text[i].key,
-             info_ptr->text[i].text,
-             0);
-         /* Mark this chunk as written */
-         info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
-#else
-         /* Can't get here */
-         png_warning(png_ptr, "Unable to write uncompressed text");
-#endif
-      }
-   }
-#endif /* tEXt */
-
-#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-   write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_PLTE);
-#endif
-}
-
-/* Writes the end of the PNG file.  If you don't want to write comments or
- * time information, you can pass NULL for info.  If you already wrote these
- * in png_write_info(), do not write them again here.  If you have long
- * comments, I suggest writing them here, and compressing them.
- */
-void PNGAPI
-png_write_end(png_structrp png_ptr, png_inforp info_ptr)
-{
-   png_debug(1, "in png_write_end");
-
-   if (png_ptr == NULL)
-      return;
-
-   if ((png_ptr->mode & PNG_HAVE_IDAT) == 0)
-      png_error(png_ptr, "No IDATs written into file");
-
-#ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED
-   if (png_ptr->num_palette_max > png_ptr->num_palette)
-      png_benign_error(png_ptr, "Wrote palette index exceeding num_palette");
-#endif
-
-   /* See if user wants us to write information chunks */
-   if (info_ptr != NULL)
-   {
-#ifdef PNG_WRITE_TEXT_SUPPORTED
-      int i; /* local index variable */
-#endif
-#ifdef PNG_WRITE_tIME_SUPPORTED
-      /* Check to see if user has supplied a time chunk */
-      if ((info_ptr->valid & PNG_INFO_tIME) != 0 &&
-          (png_ptr->mode & PNG_WROTE_tIME) == 0)
-         png_write_tIME(png_ptr, &(info_ptr->mod_time));
-
-#endif
-#ifdef PNG_WRITE_TEXT_SUPPORTED
-      /* Loop through comment chunks */
-      for (i = 0; i < info_ptr->num_text; i++)
-      {
-         png_debug2(2, "Writing trailer text chunk %d, type %d", i,
-             info_ptr->text[i].compression);
-         /* An internationalized chunk? */
-         if (info_ptr->text[i].compression > 0)
-         {
-#ifdef PNG_WRITE_iTXt_SUPPORTED
-            /* Write international chunk */
-            png_write_iTXt(png_ptr,
-                info_ptr->text[i].compression,
-                info_ptr->text[i].key,
-                info_ptr->text[i].lang,
-                info_ptr->text[i].lang_key,
-                info_ptr->text[i].text);
-            /* Mark this chunk as written */
-            if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
-               info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
-            else
-               info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
-#else
-            png_warning(png_ptr, "Unable to write international text");
-#endif
-         }
-
-         else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
-         {
-#ifdef PNG_WRITE_zTXt_SUPPORTED
-            /* Write compressed chunk */
-            png_write_zTXt(png_ptr, info_ptr->text[i].key,
-                info_ptr->text[i].text, info_ptr->text[i].compression);
-            /* Mark this chunk as written */
-            info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
-#else
-            png_warning(png_ptr, "Unable to write compressed text");
-#endif
-         }
-
-         else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
-         {
-#ifdef PNG_WRITE_tEXt_SUPPORTED
-            /* Write uncompressed chunk */
-            png_write_tEXt(png_ptr, info_ptr->text[i].key,
-                info_ptr->text[i].text, 0);
-            /* Mark this chunk as written */
-            info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
-#else
-            png_warning(png_ptr, "Unable to write uncompressed text");
-#endif
-         }
-      }
-#endif
-
-#ifdef PNG_WRITE_eXIf_SUPPORTED
-   if ((info_ptr->valid & PNG_INFO_eXIf) != 0)
-      png_write_eXIf(png_ptr, info_ptr->exif, info_ptr->num_exif);
-#endif
-
-#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-      write_unknown_chunks(png_ptr, info_ptr, PNG_AFTER_IDAT);
-#endif
-   }
-
-   png_ptr->mode |= PNG_AFTER_IDAT;
-
-   /* Write end of PNG file */
-   png_write_IEND(png_ptr);
-
-   /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
-    * and restored again in libpng-1.2.30, may cause some applications that
-    * do not set png_ptr->output_flush_fn to crash.  If your application
-    * experiences a problem, please try building libpng with
-    * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
-    * png-mng-implement at lists.sf.net .
-    */
-#ifdef PNG_WRITE_FLUSH_SUPPORTED
-#  ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED
-   png_flush(png_ptr);
-#  endif
-#endif
-}
-
-#ifdef PNG_CONVERT_tIME_SUPPORTED
-void PNGAPI
-png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm * ttime)
-{
-   png_debug(1, "in png_convert_from_struct_tm");
-
-   ptime->year = (png_uint_16)(1900 + ttime->tm_year);
-   ptime->month = (png_byte)(ttime->tm_mon + 1);
-   ptime->day = (png_byte)ttime->tm_mday;
-   ptime->hour = (png_byte)ttime->tm_hour;
-   ptime->minute = (png_byte)ttime->tm_min;
-   ptime->second = (png_byte)ttime->tm_sec;
-}
-
-void PNGAPI
-png_convert_from_time_t(png_timep ptime, time_t ttime)
-{
-   struct tm *tbuf;
-
-   png_debug(1, "in png_convert_from_time_t");
-
-   tbuf = gmtime(&ttime);
-   png_convert_from_struct_tm(ptime, tbuf);
-}
-#endif
-
-/* Initialize png_ptr structure, and allocate any memory needed */
-PNG_FUNCTION(png_structp,PNGAPI
-png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
-    png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED)
-{
-#ifndef PNG_USER_MEM_SUPPORTED
-   png_structrp png_ptr = png_create_png_struct(user_png_ver, error_ptr,
-       error_fn, warn_fn, NULL, NULL, NULL);
-#else
-   return png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
-       warn_fn, NULL, NULL, NULL);
-}
-
-/* Alternate initialize png_ptr structure, and allocate any memory needed */
-PNG_FUNCTION(png_structp,PNGAPI
-png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,
-    png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
-    png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED)
-{
-   png_structrp png_ptr = png_create_png_struct(user_png_ver, error_ptr,
-       error_fn, warn_fn, mem_ptr, malloc_fn, free_fn);
-#endif /* USER_MEM */
-   if (png_ptr != NULL)
-   {
-      /* Set the zlib control values to defaults; they can be overridden by the
-       * application after the struct has been created.
-       */
-      png_ptr->zbuffer_size = PNG_ZBUF_SIZE;
-
-      /* The 'zlib_strategy' setting is irrelevant because png_default_claim in
-       * pngwutil.c defaults it according to whether or not filters will be
-       * used, and ignores this setting.
-       */
-      png_ptr->zlib_strategy = PNG_Z_DEFAULT_STRATEGY;
-      png_ptr->zlib_level = PNG_Z_DEFAULT_COMPRESSION;
-      png_ptr->zlib_mem_level = 8;
-      png_ptr->zlib_window_bits = 15;
-      png_ptr->zlib_method = 8;
-
-#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED
-      png_ptr->zlib_text_strategy = PNG_TEXT_Z_DEFAULT_STRATEGY;
-      png_ptr->zlib_text_level = PNG_TEXT_Z_DEFAULT_COMPRESSION;
-      png_ptr->zlib_text_mem_level = 8;
-      png_ptr->zlib_text_window_bits = 15;
-      png_ptr->zlib_text_method = 8;
-#endif /* WRITE_COMPRESSED_TEXT */
-
-      /* This is a highly dubious configuration option; by default it is off,
-       * but it may be appropriate for private builds that are testing
-       * extensions not conformant to the current specification, or of
-       * applications that must not fail to write at all costs!
-       */
-#ifdef PNG_BENIGN_WRITE_ERRORS_SUPPORTED
-      /* In stable builds only warn if an application error can be completely
-       * handled.
-       */
-      png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN;
-#endif
-
-      /* App warnings are warnings in release (or release candidate) builds but
-       * are errors during development.
-       */
-#if PNG_RELEASE_BUILD
-      png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN;
-#endif
-
-      /* TODO: delay this, it can be done in png_init_io() (if the app doesn't
-       * do it itself) avoiding setting the default function if it is not
-       * required.
-       */
-      png_set_write_fn(png_ptr, NULL, NULL, NULL);
-   }
-
-   return png_ptr;
-}
-
-
-/* Write a few rows of image data.  If the image is interlaced,
- * either you will have to write the 7 sub images, or, if you
- * have called png_set_interlace_handling(), you will have to
- * "write" the image seven times.
- */
-void PNGAPI
-png_write_rows(png_structrp png_ptr, png_bytepp row,
-    png_uint_32 num_rows)
-{
-   png_uint_32 i; /* row counter */
-   png_bytepp rp; /* row pointer */
-
-   png_debug(1, "in png_write_rows");
-
-   if (png_ptr == NULL)
-      return;
-
-   /* Loop through the rows */
-   for (i = 0, rp = row; i < num_rows; i++, rp++)
-   {
-      png_write_row(png_ptr, *rp);
-   }
-}
-
-/* Write the image.  You only need to call this function once, even
- * if you are writing an interlaced image.
- */
-void PNGAPI
-png_write_image(png_structrp png_ptr, png_bytepp image)
-{
-   png_uint_32 i; /* row index */
-   int pass, num_pass; /* pass variables */
-   png_bytepp rp; /* points to current row */
-
-   if (png_ptr == NULL)
-      return;
-
-   png_debug(1, "in png_write_image");
-
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED
-   /* Initialize interlace handling.  If image is not interlaced,
-    * this will set pass to 1
-    */
-   num_pass = png_set_interlace_handling(png_ptr);
-#else
-   num_pass = 1;
-#endif
-   /* Loop through passes */
-   for (pass = 0; pass < num_pass; pass++)
-   {
-      /* Loop through image */
-      for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
-      {
-         png_write_row(png_ptr, *rp);
-      }
-   }
-}
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-/* Performs intrapixel differencing  */
-static void
-png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
-{
-   png_debug(1, "in png_do_write_intrapixel");
-
-   if ((row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
-   {
-      int bytes_per_pixel;
-      png_uint_32 row_width = row_info->width;
-      if (row_info->bit_depth == 8)
-      {
-         png_bytep rp;
-         png_uint_32 i;
-
-         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
-            bytes_per_pixel = 3;
-
-         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
-            bytes_per_pixel = 4;
-
-         else
-            return;
-
-         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
-         {
-            *(rp)     = (png_byte)(*rp       - *(rp + 1));
-            *(rp + 2) = (png_byte)(*(rp + 2) - *(rp + 1));
-         }
-      }
-
-#ifdef PNG_WRITE_16BIT_SUPPORTED
-      else if (row_info->bit_depth == 16)
-      {
-         png_bytep rp;
-         png_uint_32 i;
-
-         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
-            bytes_per_pixel = 6;
-
-         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
-            bytes_per_pixel = 8;
-
-         else
-            return;
-
-         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
-         {
-            png_uint_32 s0   = (png_uint_32)(*(rp    ) << 8) | *(rp + 1);
-            png_uint_32 s1   = (png_uint_32)(*(rp + 2) << 8) | *(rp + 3);
-            png_uint_32 s2   = (png_uint_32)(*(rp + 4) << 8) | *(rp + 5);
-            png_uint_32 red  = (png_uint_32)((s0 - s1) & 0xffffL);
-            png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL);
-            *(rp    ) = (png_byte)(red >> 8);
-            *(rp + 1) = (png_byte)red;
-            *(rp + 4) = (png_byte)(blue >> 8);
-            *(rp + 5) = (png_byte)blue;
-         }
-      }
-#endif /* WRITE_16BIT */
-   }
-}
-#endif /* MNG_FEATURES */
-
-/* Called by user to write a row of image data */
-void PNGAPI
-png_write_row(png_structrp png_ptr, png_const_bytep row)
-{
-   /* 1.5.6: moved from png_struct to be a local structure: */
-   png_row_info row_info;
-
-   if (png_ptr == NULL)
-      return;
-
-   png_debug2(1, "in png_write_row (row %u, pass %d)",
-       png_ptr->row_number, png_ptr->pass);
-
-   /* Initialize transformations and other stuff if first time */
-   if (png_ptr->row_number == 0 && png_ptr->pass == 0)
-   {
-      /* Make sure we wrote the header info */
-      if ((png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE) == 0)
-         png_error(png_ptr,
-             "png_write_info was never called before png_write_row");
-
-      /* Check for transforms that have been set but were defined out */
-#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
-      if ((png_ptr->transformations & PNG_INVERT_MONO) != 0)
-         png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined");
-#endif
-
-#if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
-      if ((png_ptr->transformations & PNG_FILLER) != 0)
-         png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined");
-#endif
-#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \
-    defined(PNG_READ_PACKSWAP_SUPPORTED)
-      if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
-         png_warning(png_ptr,
-             "PNG_WRITE_PACKSWAP_SUPPORTED is not defined");
-#endif
-
-#if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
-      if ((png_ptr->transformations & PNG_PACK) != 0)
-         png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined");
-#endif
-
-#if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
-      if ((png_ptr->transformations & PNG_SHIFT) != 0)
-         png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined");
-#endif
-
-#if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
-      if ((png_ptr->transformations & PNG_BGR) != 0)
-         png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined");
-#endif
-
-#if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
-      if ((png_ptr->transformations & PNG_SWAP_BYTES) != 0)
-         png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined");
-#endif
-
-      png_write_start_row(png_ptr);
-   }
-
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED
-   /* If interlaced and not interested in row, return */
-   if (png_ptr->interlaced != 0 &&
-       (png_ptr->transformations & PNG_INTERLACE) != 0)
-   {
-      switch (png_ptr->pass)
-      {
-         case 0:
-            if ((png_ptr->row_number & 0x07) != 0)
-            {
-               png_write_finish_row(png_ptr);
-               return;
-            }
-            break;
-
-         case 1:
-            if ((png_ptr->row_number & 0x07) != 0 || png_ptr->width < 5)
-            {
-               png_write_finish_row(png_ptr);
-               return;
-            }
-            break;
-
-         case 2:
-            if ((png_ptr->row_number & 0x07) != 4)
-            {
-               png_write_finish_row(png_ptr);
-               return;
-            }
-            break;
-
-         case 3:
-            if ((png_ptr->row_number & 0x03) != 0 || png_ptr->width < 3)
-            {
-               png_write_finish_row(png_ptr);
-               return;
-            }
-            break;
-
-         case 4:
-            if ((png_ptr->row_number & 0x03) != 2)
-            {
-               png_write_finish_row(png_ptr);
-               return;
-            }
-            break;
-
-         case 5:
-            if ((png_ptr->row_number & 0x01) != 0 || png_ptr->width < 2)
-            {
-               png_write_finish_row(png_ptr);
-               return;
-            }
-            break;
-
-         case 6:
-            if ((png_ptr->row_number & 0x01) == 0)
-            {
-               png_write_finish_row(png_ptr);
-               return;
-            }
-            break;
-
-         default: /* error: ignore it */
-            break;
-      }
-   }
-#endif
-
-   /* Set up row info for transformations */
-   row_info.color_type = png_ptr->color_type;
-   row_info.width = png_ptr->usr_width;
-   row_info.channels = png_ptr->usr_channels;
-   row_info.bit_depth = png_ptr->usr_bit_depth;
-   row_info.pixel_depth = (png_byte)(row_info.bit_depth * row_info.channels);
-   row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width);
-
-   png_debug1(3, "row_info->color_type = %d", row_info.color_type);
-   png_debug1(3, "row_info->width = %u", row_info.width);
-   png_debug1(3, "row_info->channels = %d", row_info.channels);
-   png_debug1(3, "row_info->bit_depth = %d", row_info.bit_depth);
-   png_debug1(3, "row_info->pixel_depth = %d", row_info.pixel_depth);
-   png_debug1(3, "row_info->rowbytes = %lu", (unsigned long)row_info.rowbytes);
-
-   /* Copy user's row into buffer, leaving room for filter byte. */
-   memcpy(png_ptr->row_buf + 1, row, row_info.rowbytes);
-
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED
-   /* Handle interlacing */
-   if (png_ptr->interlaced && png_ptr->pass < 6 &&
-       (png_ptr->transformations & PNG_INTERLACE) != 0)
-   {
-      png_do_write_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass);
-      /* This should always get caught above, but still ... */
-      if (row_info.width == 0)
-      {
-         png_write_finish_row(png_ptr);
-         return;
-      }
-   }
-#endif
-
-#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
-   /* Handle other transformations */
-   if (png_ptr->transformations != 0)
-      png_do_write_transformations(png_ptr, &row_info);
-#endif
-
-   /* At this point the row_info pixel depth must match the 'transformed' depth,
-    * which is also the output depth.
-    */
-   if (row_info.pixel_depth != png_ptr->pixel_depth ||
-       row_info.pixel_depth != png_ptr->transformed_pixel_depth)
-      png_error(png_ptr, "internal write transform logic error");
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-   /* Write filter_method 64 (intrapixel differencing) only if
-    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
-    * 2. Libpng did not write a PNG signature (this filter_method is only
-    *    used in PNG datastreams that are embedded in MNG datastreams) and
-    * 3. The application called png_permit_mng_features with a mask that
-    *    included PNG_FLAG_MNG_FILTER_64 and
-    * 4. The filter_method is 64 and
-    * 5. The color_type is RGB or RGBA
-    */
-   if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) != 0 &&
-       (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
-   {
-      /* Intrapixel differencing */
-      png_do_write_intrapixel(&row_info, png_ptr->row_buf + 1);
-   }
-#endif
-
-/* Added at libpng-1.5.10 */
-#ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED
-   /* Check for out-of-range palette index */
-   if (row_info.color_type == PNG_COLOR_TYPE_PALETTE &&
-       png_ptr->num_palette_max >= 0)
-      png_do_check_palette_indexes(png_ptr, &row_info);
-#endif
-
-   /* Find a filter if necessary, filter the row and write it out. */
-   png_write_find_filter(png_ptr, &row_info);
-
-   if (png_ptr->write_row_fn != NULL)
-      (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
-}
-
-#ifdef PNG_WRITE_FLUSH_SUPPORTED
-/* Set the automatic flush interval or 0 to turn flushing off */
-void PNGAPI
-png_set_flush(png_structrp png_ptr, int nrows)
-{
-   png_debug(1, "in png_set_flush");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->flush_dist = (nrows < 0 ? 0 : (png_uint_32)nrows);
-}
-
-/* Flush the current output buffers now */
-void PNGAPI
-png_write_flush(png_structrp png_ptr)
-{
-   png_debug(1, "in png_write_flush");
-
-   if (png_ptr == NULL)
-      return;
-
-   /* We have already written out all of the data */
-   if (png_ptr->row_number >= png_ptr->num_rows)
-      return;
-
-   png_compress_IDAT(png_ptr, NULL, 0, Z_SYNC_FLUSH);
-   png_ptr->flush_rows = 0;
-   png_flush(png_ptr);
-}
-#endif /* WRITE_FLUSH */
-
-/* Free any memory used in png_ptr struct without freeing the struct itself. */
-static void
-png_write_destroy(png_structrp png_ptr)
-{
-   png_debug(1, "in png_write_destroy");
-
-   /* Free any memory zlib uses */
-   if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) != 0)
-      deflateEnd(&png_ptr->zstream);
-
-   /* Free our memory.  png_free checks NULL for us. */
-   png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
-   png_free(png_ptr, png_ptr->row_buf);
-   png_ptr->row_buf = NULL;
-#ifdef PNG_WRITE_FILTER_SUPPORTED
-   png_free(png_ptr, png_ptr->prev_row);
-   png_free(png_ptr, png_ptr->try_row);
-   png_free(png_ptr, png_ptr->tst_row);
-   png_ptr->prev_row = NULL;
-   png_ptr->try_row = NULL;
-   png_ptr->tst_row = NULL;
-#endif
-
-#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
-   png_free(png_ptr, png_ptr->chunk_list);
-   png_ptr->chunk_list = NULL;
-#endif
-
-   /* The error handling and memory handling information is left intact at this
-    * point: the jmp_buf may still have to be freed.  See png_destroy_png_struct
-    * for how this happens.
-    */
-}
-
-/* Free all memory used by the write.
- * In libpng 1.6.0 this API changed quietly to no longer accept a NULL value for
- * *png_ptr_ptr.  Prior to 1.6.0 it would accept such a value and it would free
- * the passed in info_structs but it would quietly fail to free any of the data
- * inside them.  In 1.6.0 it quietly does nothing (it has to be quiet because it
- * has no png_ptr.)
- */
-void PNGAPI
-png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
-{
-   png_debug(1, "in png_destroy_write_struct");
-
-   if (png_ptr_ptr != NULL)
-   {
-      png_structrp png_ptr = *png_ptr_ptr;
-
-      if (png_ptr != NULL) /* added in libpng 1.6.0 */
-      {
-         png_destroy_info_struct(png_ptr, info_ptr_ptr);
-
-         *png_ptr_ptr = NULL;
-         png_write_destroy(png_ptr);
-         png_destroy_png_struct(png_ptr);
-      }
-   }
-}
-
-/* Allow the application to select one or more row filters to use. */
-void PNGAPI
-png_set_filter(png_structrp png_ptr, int method, int filters)
-{
-   png_debug(1, "in png_set_filter");
-
-   if (png_ptr == NULL)
-      return;
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-   if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) != 0 &&
-       (method == PNG_INTRAPIXEL_DIFFERENCING))
-      method = PNG_FILTER_TYPE_BASE;
-
-#endif
-   if (method == PNG_FILTER_TYPE_BASE)
-   {
-      switch (filters & (PNG_ALL_FILTERS | 0x07))
-      {
-#ifdef PNG_WRITE_FILTER_SUPPORTED
-         case 5:
-         case 6:
-         case 7: png_app_error(png_ptr, "Unknown row filter for method 0");
-#endif /* WRITE_FILTER */
-            /* FALLTHROUGH */
-         case PNG_FILTER_VALUE_NONE:
-            png_ptr->do_filter = PNG_FILTER_NONE; break;
-
-#ifdef PNG_WRITE_FILTER_SUPPORTED
-         case PNG_FILTER_VALUE_SUB:
-            png_ptr->do_filter = PNG_FILTER_SUB; break;
-
-         case PNG_FILTER_VALUE_UP:
-            png_ptr->do_filter = PNG_FILTER_UP; break;
-
-         case PNG_FILTER_VALUE_AVG:
-            png_ptr->do_filter = PNG_FILTER_AVG; break;
-
-         case PNG_FILTER_VALUE_PAETH:
-            png_ptr->do_filter = PNG_FILTER_PAETH; break;
-
-         default:
-            png_ptr->do_filter = (png_byte)filters; break;
-#else
-         default:
-            png_app_error(png_ptr, "Unknown row filter for method 0");
-#endif /* WRITE_FILTER */
-      }
-
-#ifdef PNG_WRITE_FILTER_SUPPORTED
-      /* If we have allocated the row_buf, this means we have already started
-       * with the image and we should have allocated all of the filter buffers
-       * that have been selected.  If prev_row isn't already allocated, then
-       * it is too late to start using the filters that need it, since we
-       * will be missing the data in the previous row.  If an application
-       * wants to start and stop using particular filters during compression,
-       * it should start out with all of the filters, and then remove them
-       * or add them back after the start of compression.
-       *
-       * NOTE: this is a nasty constraint on the code, because it means that the
-       * prev_row buffer must be maintained even if there are currently no
-       * 'prev_row' requiring filters active.
-       */
-      if (png_ptr->row_buf != NULL)
-      {
-         int num_filters;
-         png_alloc_size_t buf_size;
-
-         /* Repeat the checks in png_write_start_row; 1 pixel high or wide
-          * images cannot benefit from certain filters.  If this isn't done here
-          * the check below will fire on 1 pixel high images.
-          */
-         if (png_ptr->height == 1)
-            filters &= ~(PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH);
-
-         if (png_ptr->width == 1)
-            filters &= ~(PNG_FILTER_SUB|PNG_FILTER_AVG|PNG_FILTER_PAETH);
-
-         if ((filters & (PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH)) != 0
-            && png_ptr->prev_row == NULL)
-         {
-            /* This is the error case, however it is benign - the previous row
-             * is not available so the filter can't be used.  Just warn here.
-             */
-            png_app_warning(png_ptr,
-                "png_set_filter: UP/AVG/PAETH cannot be added after start");
-            filters &= ~(PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH);
-         }
-
-         num_filters = 0;
-
-         if (filters & PNG_FILTER_SUB)
-            num_filters++;
-
-         if (filters & PNG_FILTER_UP)
-            num_filters++;
-
-         if (filters & PNG_FILTER_AVG)
-            num_filters++;
-
-         if (filters & PNG_FILTER_PAETH)
-            num_filters++;
-
-         /* Allocate needed row buffers if they have not already been
-          * allocated.
-          */
-         buf_size = PNG_ROWBYTES(png_ptr->usr_channels * png_ptr->usr_bit_depth,
-             png_ptr->width) + 1;
-
-         if (png_ptr->try_row == NULL)
-            png_ptr->try_row = png_voidcast(png_bytep,
-                png_malloc(png_ptr, buf_size));
-
-         if (num_filters > 1)
-         {
-            if (png_ptr->tst_row == NULL)
-               png_ptr->tst_row = png_voidcast(png_bytep,
-                   png_malloc(png_ptr, buf_size));
-         }
-      }
-      png_ptr->do_filter = (png_byte)filters;
-#endif
-   }
-   else
-      png_error(png_ptr, "Unknown custom filter method");
-}
-
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* DEPRECATED */
-/* Provide floating and fixed point APIs */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-void PNGAPI
-png_set_filter_heuristics(png_structrp png_ptr, int heuristic_method,
-    int num_weights, png_const_doublep filter_weights,
-    png_const_doublep filter_costs)
-{
-   PNG_UNUSED(png_ptr)
-   PNG_UNUSED(heuristic_method)
-   PNG_UNUSED(num_weights)
-   PNG_UNUSED(filter_weights)
-   PNG_UNUSED(filter_costs)
-}
-#endif /* FLOATING_POINT */
-
-#ifdef PNG_FIXED_POINT_SUPPORTED
-void PNGAPI
-png_set_filter_heuristics_fixed(png_structrp png_ptr, int heuristic_method,
-    int num_weights, png_const_fixed_point_p filter_weights,
-    png_const_fixed_point_p filter_costs)
-{
-   PNG_UNUSED(png_ptr)
-   PNG_UNUSED(heuristic_method)
-   PNG_UNUSED(num_weights)
-   PNG_UNUSED(filter_weights)
-   PNG_UNUSED(filter_costs)
-}
-#endif /* FIXED_POINT */
-#endif /* WRITE_WEIGHTED_FILTER */
-
-#ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
-void PNGAPI
-png_set_compression_level(png_structrp png_ptr, int level)
-{
-   png_debug(1, "in png_set_compression_level");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->zlib_level = level;
-}
-
-void PNGAPI
-png_set_compression_mem_level(png_structrp png_ptr, int mem_level)
-{
-   png_debug(1, "in png_set_compression_mem_level");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->zlib_mem_level = mem_level;
-}
-
-void PNGAPI
-png_set_compression_strategy(png_structrp png_ptr, int strategy)
-{
-   png_debug(1, "in png_set_compression_strategy");
-
-   if (png_ptr == NULL)
-      return;
-
-   /* The flag setting here prevents the libpng dynamic selection of strategy.
-    */
-   png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
-   png_ptr->zlib_strategy = strategy;
-}
-
-/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
- * smaller value of window_bits if it can do so safely.
- */
-void PNGAPI
-png_set_compression_window_bits(png_structrp png_ptr, int window_bits)
-{
-   if (png_ptr == NULL)
-      return;
-
-   /* Prior to 1.6.0 this would warn but then set the window_bits value. This
-    * meant that negative window bits values could be selected that would cause
-    * libpng to write a non-standard PNG file with raw deflate or gzip
-    * compressed IDAT or ancillary chunks.  Such files can be read and there is
-    * no warning on read, so this seems like a very bad idea.
-    */
-   if (window_bits > 15)
-   {
-      png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
-      window_bits = 15;
-   }
-
-   else if (window_bits < 8)
-   {
-      png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
-      window_bits = 8;
-   }
-
-   png_ptr->zlib_window_bits = window_bits;
-}
-
-void PNGAPI
-png_set_compression_method(png_structrp png_ptr, int method)
-{
-   png_debug(1, "in png_set_compression_method");
-
-   if (png_ptr == NULL)
-      return;
-
-   /* This would produce an invalid PNG file if it worked, but it doesn't and
-    * deflate will fault it, so it is harmless to just warn here.
-    */
-   if (method != 8)
-      png_warning(png_ptr, "Only compression method 8 is supported by PNG");
-
-   png_ptr->zlib_method = method;
-}
-#endif /* WRITE_CUSTOMIZE_COMPRESSION */
-
-/* The following were added to libpng-1.5.4 */
-#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
-void PNGAPI
-png_set_text_compression_level(png_structrp png_ptr, int level)
-{
-   png_debug(1, "in png_set_text_compression_level");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->zlib_text_level = level;
-}
-
-void PNGAPI
-png_set_text_compression_mem_level(png_structrp png_ptr, int mem_level)
-{
-   png_debug(1, "in png_set_text_compression_mem_level");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->zlib_text_mem_level = mem_level;
-}
-
-void PNGAPI
-png_set_text_compression_strategy(png_structrp png_ptr, int strategy)
-{
-   png_debug(1, "in png_set_text_compression_strategy");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->zlib_text_strategy = strategy;
-}
-
-/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
- * smaller value of window_bits if it can do so safely.
- */
-void PNGAPI
-png_set_text_compression_window_bits(png_structrp png_ptr, int window_bits)
-{
-   if (png_ptr == NULL)
-      return;
-
-   if (window_bits > 15)
-   {
-      png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
-      window_bits = 15;
-   }
-
-   else if (window_bits < 8)
-   {
-      png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
-      window_bits = 8;
-   }
-
-   png_ptr->zlib_text_window_bits = window_bits;
-}
-
-void PNGAPI
-png_set_text_compression_method(png_structrp png_ptr, int method)
-{
-   png_debug(1, "in png_set_text_compression_method");
-
-   if (png_ptr == NULL)
-      return;
-
-   if (method != 8)
-      png_warning(png_ptr, "Only compression method 8 is supported by PNG");
-
-   png_ptr->zlib_text_method = method;
-}
-#endif /* WRITE_CUSTOMIZE_ZTXT_COMPRESSION */
-/* end of API added to libpng-1.5.4 */
-
-void PNGAPI
-png_set_write_status_fn(png_structrp png_ptr, png_write_status_ptr write_row_fn)
-{
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->write_row_fn = write_row_fn;
-}
-
-#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
-void PNGAPI
-png_set_write_user_transform_fn(png_structrp png_ptr, png_user_transform_ptr
-    write_user_transform_fn)
-{
-   png_debug(1, "in png_set_write_user_transform_fn");
-
-   if (png_ptr == NULL)
-      return;
-
-   png_ptr->transformations |= PNG_USER_TRANSFORM;
-   png_ptr->write_user_transform_fn = write_user_transform_fn;
-}
-#endif
-
-
-#ifdef PNG_INFO_IMAGE_SUPPORTED
-void PNGAPI
-png_write_png(png_structrp png_ptr, png_inforp info_ptr,
-    int transforms, voidp params)
-{
-   if (png_ptr == NULL || info_ptr == NULL)
-      return;
-
-   if ((info_ptr->valid & PNG_INFO_IDAT) == 0)
-   {
-      png_app_error(png_ptr, "no rows for png_write_image to write");
-      return;
-   }
-
-   /* Write the file header information. */
-   png_write_info(png_ptr, info_ptr);
-
-   /* ------ these transformations don't touch the info structure ------- */
-
-   /* Invert monochrome pixels */
-   if ((transforms & PNG_TRANSFORM_INVERT_MONO) != 0)
-#ifdef PNG_WRITE_INVERT_SUPPORTED
-      png_set_invert_mono(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_INVERT_MONO not supported");
-#endif
-
-   /* Shift the pixels up to a legal bit depth and fill in
-    * as appropriate to correctly scale the image.
-    */
-   if ((transforms & PNG_TRANSFORM_SHIFT) != 0)
-#ifdef PNG_WRITE_SHIFT_SUPPORTED
-      if ((info_ptr->valid & PNG_INFO_sBIT) != 0)
-         png_set_shift(png_ptr, &info_ptr->sig_bit);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_SHIFT not supported");
-#endif
-
-   /* Pack pixels into bytes */
-   if ((transforms & PNG_TRANSFORM_PACKING) != 0)
-#ifdef PNG_WRITE_PACK_SUPPORTED
-      png_set_packing(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_PACKING not supported");
-#endif
-
-   /* Swap location of alpha bytes from ARGB to RGBA */
-   if ((transforms & PNG_TRANSFORM_SWAP_ALPHA) != 0)
-#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
-      png_set_swap_alpha(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_SWAP_ALPHA not supported");
-#endif
-
-   /* Remove a filler (X) from XRGB/RGBX/AG/GA into to convert it into
-    * RGB, note that the code expects the input color type to be G or RGB; no
-    * alpha channel.
-    */
-   if ((transforms & (PNG_TRANSFORM_STRIP_FILLER_AFTER|
-       PNG_TRANSFORM_STRIP_FILLER_BEFORE)) != 0)
-   {
-#ifdef PNG_WRITE_FILLER_SUPPORTED
-      if ((transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER) != 0)
-      {
-         if ((transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) != 0)
-            png_app_error(png_ptr,
-                "PNG_TRANSFORM_STRIP_FILLER: BEFORE+AFTER not supported");
-
-         /* Continue if ignored - this is the pre-1.6.10 behavior */
-         png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
-      }
-
-      else if ((transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) != 0)
-         png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_STRIP_FILLER not supported");
-#endif
-   }
-
-   /* Flip BGR pixels to RGB */
-   if ((transforms & PNG_TRANSFORM_BGR) != 0)
-#ifdef PNG_WRITE_BGR_SUPPORTED
-      png_set_bgr(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_BGR not supported");
-#endif
-
-   /* Swap bytes of 16-bit files to most significant byte first */
-   if ((transforms & PNG_TRANSFORM_SWAP_ENDIAN) != 0)
-#ifdef PNG_WRITE_SWAP_SUPPORTED
-      png_set_swap(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_SWAP_ENDIAN not supported");
-#endif
-
-   /* Swap bits of 1-bit, 2-bit, 4-bit packed pixel formats */
-   if ((transforms & PNG_TRANSFORM_PACKSWAP) != 0)
-#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
-      png_set_packswap(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_PACKSWAP not supported");
-#endif
-
-   /* Invert the alpha channel from opacity to transparency */
-   if ((transforms & PNG_TRANSFORM_INVERT_ALPHA) != 0)
-#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
-      png_set_invert_alpha(png_ptr);
-#else
-      png_app_error(png_ptr, "PNG_TRANSFORM_INVERT_ALPHA not supported");
-#endif
-
-   /* ----------------------- end of transformations ------------------- */
-
-   /* Write the bits */
-   png_write_image(png_ptr, info_ptr->row_pointers);
-
-   /* It is REQUIRED to call this to finish writing the rest of the file */
-   png_write_end(png_ptr, info_ptr);
-
-   PNG_UNUSED(params)
-}
-#endif
-
-
-#ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED
-/* Initialize the write structure - general purpose utility. */
-static int
-png_image_write_init(png_imagep image)
-{
-   png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, image,
-       png_safe_error, png_safe_warning);
-
-   if (png_ptr != NULL)
-   {
-      png_infop info_ptr = png_create_info_struct(png_ptr);
-
-      if (info_ptr != NULL)
-      {
-         png_controlp control = png_voidcast(png_controlp,
-             png_malloc_warn(png_ptr, (sizeof *control)));
-
-         if (control != NULL)
-         {
-            memset(control, 0, (sizeof *control));
-
-            control->png_ptr = png_ptr;
-            control->info_ptr = info_ptr;
-            control->for_write = 1;
-
-            image->opaque = control;
-            return 1;
-         }
-
-         /* Error clean up */
-         png_destroy_info_struct(png_ptr, &info_ptr);
-      }
-
-      png_destroy_write_struct(&png_ptr, NULL);
-   }
-
-   return png_image_error(image, "png_image_write_: out of memory");
-}
-
-/* Arguments to png_image_write_main: */
-typedef struct
-{
-   /* Arguments: */
-   png_imagep      image;
-   png_const_voidp buffer;
-   png_int_32      row_stride;
-   png_const_voidp colormap;
-   int             convert_to_8bit;
-   /* Local variables: */
-   png_const_voidp first_row;
-   ptrdiff_t       row_bytes;
-   png_voidp       local_row;
-   /* Byte count for memory writing */
-   png_bytep        memory;
-   png_alloc_size_t memory_bytes; /* not used for STDIO */
-   png_alloc_size_t output_bytes; /* running total */
-} png_image_write_control;
-
-/* Write png_uint_16 input to a 16-bit PNG; the png_ptr has already been set to
- * do any necessary byte swapping.  The component order is defined by the
- * png_image format value.
- */
-static int
-png_write_image_16bit(png_voidp argument)
-{
-   png_image_write_control *display = png_voidcast(png_image_write_control*,
-       argument);
-   png_imagep image = display->image;
-   png_structrp png_ptr = image->opaque->png_ptr;
-
-   png_const_uint_16p input_row = png_voidcast(png_const_uint_16p,
-       display->first_row);
-   png_uint_16p output_row = png_voidcast(png_uint_16p, display->local_row);
-   png_uint_16p row_end;
-   const unsigned int channels = (image->format & PNG_FORMAT_FLAG_COLOR) != 0 ?
-       3 : 1;
-   int aindex = 0;
-   png_uint_32 y = image->height;
-
-   if ((image->format & PNG_FORMAT_FLAG_ALPHA) != 0)
-   {
-#   ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
-      if ((image->format & PNG_FORMAT_FLAG_AFIRST) != 0)
-      {
-         aindex = -1;
-         ++input_row; /* To point to the first component */
-         ++output_row;
-      }
-         else
-            aindex = (int)channels;
-#     else
-         aindex = (int)channels;
-#     endif
-   }
-
-   else
-      png_error(png_ptr, "png_write_image: internal call error");
-
-   /* Work out the output row end and count over this, note that the increment
-    * above to 'row' means that row_end can actually be beyond the end of the
-    * row; this is correct.
-    */
-   row_end = output_row + image->width * (channels+1);
-
-   for (; y > 0; --y)
-   {
-      png_const_uint_16p in_ptr = input_row;
-      png_uint_16p out_ptr = output_row;
-
-      while (out_ptr < row_end)
-      {
-         const png_uint_16 alpha = in_ptr[aindex];
-         png_uint_32 reciprocal = 0;
-         int c;
-
-         out_ptr[aindex] = alpha;
-
-         /* Calculate a reciprocal.  The correct calculation is simply
-          * component/alpha*65535 << 15. (I.e. 15 bits of precision); this
-          * allows correct rounding by adding .5 before the shift.  'reciprocal'
-          * is only initialized when required.
-          */
-         if (alpha > 0 && alpha < 65535)
-            reciprocal = ((0xffff<<15)+(alpha>>1))/alpha;
-
-         c = (int)channels;
-         do /* always at least one channel */
-         {
-            png_uint_16 component = *in_ptr++;
-
-            /* The following gives 65535 for an alpha of 0, which is fine,
-             * otherwise if 0/0 is represented as some other value there is more
-             * likely to be a discontinuity which will probably damage
-             * compression when moving from a fully transparent area to a
-             * nearly transparent one.  (The assumption here is that opaque
-             * areas tend not to be 0 intensity.)
-             */
-            if (component >= alpha)
-               component = 65535;
-
-            /* component<alpha, so component/alpha is less than one and
-             * component*reciprocal is less than 2^31.
-             */
-            else if (component > 0 && alpha < 65535)
-            {
-               png_uint_32 calc = component * reciprocal;
-               calc += 16384; /* round to nearest */
-               component = (png_uint_16)(calc >> 15);
-            }
-
-            *out_ptr++ = component;
-         }
-         while (--c > 0);
-
-         /* Skip to next component (skip the intervening alpha channel) */
-         ++in_ptr;
-         ++out_ptr;
-      }
-
-      png_write_row(png_ptr, png_voidcast(png_const_bytep, display->local_row));
-      input_row += (png_uint_16)display->row_bytes/(sizeof (png_uint_16));
-   }
-
-   return 1;
-}
-
-/* Given 16-bit input (1 to 4 channels) write 8-bit output.  If an alpha channel
- * is present it must be removed from the components, the components are then
- * written in sRGB encoding.  No components are added or removed.
- *
- * Calculate an alpha reciprocal to reverse pre-multiplication.  As above the
- * calculation can be done to 15 bits of accuracy; however, the output needs to
- * be scaled in the range 0..255*65535, so include that scaling here.
- */
-#   define UNP_RECIPROCAL(alpha) ((((0xffff*0xff)<<7)+(alpha>>1))/alpha)
-
-static png_byte
-png_unpremultiply(png_uint_32 component, png_uint_32 alpha,
-    png_uint_32 reciprocal/*from the above macro*/)
-{
-   /* The following gives 1.0 for an alpha of 0, which is fine, otherwise if 0/0
-    * is represented as some other value there is more likely to be a
-    * discontinuity which will probably damage compression when moving from a
-    * fully transparent area to a nearly transparent one.  (The assumption here
-    * is that opaque areas tend not to be 0 intensity.)
-    *
-    * There is a rounding problem here; if alpha is less than 128 it will end up
-    * as 0 when scaled to 8 bits.  To avoid introducing spurious colors into the
-    * output change for this too.
-    */
-   if (component >= alpha || alpha < 128)
-      return 255;
-
-   /* component<alpha, so component/alpha is less than one and
-    * component*reciprocal is less than 2^31.
-    */
-   else if (component > 0)
-   {
-      /* The test is that alpha/257 (rounded) is less than 255, the first value
-       * that becomes 255 is 65407.
-       * NOTE: this must agree with the PNG_DIV257 macro (which must, therefore,
-       * be exact!)  [Could also test reciprocal != 0]
-       */
-      if (alpha < 65407)
-      {
-         component *= reciprocal;
-         component += 64; /* round to nearest */
-         component >>= 7;
-      }
-
-      else
-         component *= 255;
-
-      /* Convert the component to sRGB. */
-      return (png_byte)PNG_sRGB_FROM_LINEAR(component);
-   }
-
-   else
-      return 0;
-}
-
-static int
-png_write_image_8bit(png_voidp argument)
-{
-   png_image_write_control *display = png_voidcast(png_image_write_control*,
-       argument);
-   png_imagep image = display->image;
-   png_structrp png_ptr = image->opaque->png_ptr;
-
-   png_const_uint_16p input_row = png_voidcast(png_const_uint_16p,
-       display->first_row);
-   png_bytep output_row = png_voidcast(png_bytep, display->local_row);
-   png_uint_32 y = image->height;
-   const unsigned int channels = (image->format & PNG_FORMAT_FLAG_COLOR) != 0 ?
-       3 : 1;
-
-   if ((image->format & PNG_FORMAT_FLAG_ALPHA) != 0)
-   {
-      png_bytep row_end;
-      int aindex;
-
-#   ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
-      if ((image->format & PNG_FORMAT_FLAG_AFIRST) != 0)
-      {
-         aindex = -1;
-         ++input_row; /* To point to the first component */
-         ++output_row;
-      }
-
-      else
-#   endif
-      aindex = (int)channels;
-
-      /* Use row_end in place of a loop counter: */
-      row_end = output_row + image->width * (channels+1);
-
-      for (; y > 0; --y)
-      {
-         png_const_uint_16p in_ptr = input_row;
-         png_bytep out_ptr = output_row;
-
-         while (out_ptr < row_end)
-         {
-            png_uint_16 alpha = in_ptr[aindex];
-            png_byte alphabyte = (png_byte)PNG_DIV257(alpha);
-            png_uint_32 reciprocal = 0;
-            int c;
-
-            /* Scale and write the alpha channel. */
-            out_ptr[aindex] = alphabyte;
-
-            if (alphabyte > 0 && alphabyte < 255)
-               reciprocal = UNP_RECIPROCAL(alpha);
-
-            c = (int)channels;
-            do /* always at least one channel */
-               *out_ptr++ = png_unpremultiply(*in_ptr++, alpha, reciprocal);
-            while (--c > 0);
-
-            /* Skip to next component (skip the intervening alpha channel) */
-            ++in_ptr;
-            ++out_ptr;
-         } /* while out_ptr < row_end */
-
-         png_write_row(png_ptr, png_voidcast(png_const_bytep,
-             display->local_row));
-         input_row += (png_uint_16)display->row_bytes/(sizeof (png_uint_16));
-      } /* while y */
-   }
-
-   else
-   {
-      /* No alpha channel, so the row_end really is the end of the row and it
-       * is sufficient to loop over the components one by one.
-       */
-      png_bytep row_end = output_row + image->width * channels;
-
-      for (; y > 0; --y)
-      {
-         png_const_uint_16p in_ptr = input_row;
-         png_bytep out_ptr = output_row;
-
-         while (out_ptr < row_end)
-         {
-            png_uint_32 component = *in_ptr++;
-
-            component *= 255;
-            *out_ptr++ = (png_byte)PNG_sRGB_FROM_LINEAR(component);
-         }
-
-         png_write_row(png_ptr, output_row);
-         input_row += (png_uint_16)display->row_bytes/(sizeof (png_uint_16));
-      }
-   }
-
-   return 1;
-}
-
-static void
-png_image_set_PLTE(png_image_write_control *display)
-{
-   const png_imagep image = display->image;
-   const void *cmap = display->colormap;
-   const int entries = image->colormap_entries > 256 ? 256 :
-       (int)image->colormap_entries;
-
-   /* NOTE: the caller must check for cmap != NULL and entries != 0 */
-   const png_uint_32 format = image->format;
-   const unsigned int channels = PNG_IMAGE_SAMPLE_CHANNELS(format);
-
-#   if defined(PNG_FORMAT_BGR_SUPPORTED) &&\
-      defined(PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED)
-      const int afirst = (format & PNG_FORMAT_FLAG_AFIRST) != 0 &&
-          (format & PNG_FORMAT_FLAG_ALPHA) != 0;
-#   else
-#     define afirst 0
-#   endif
-
-#   ifdef PNG_FORMAT_BGR_SUPPORTED
-      const int bgr = (format & PNG_FORMAT_FLAG_BGR) != 0 ? 2 : 0;
-#   else
-#     define bgr 0
-#   endif
-
-   int i, num_trans;
-   png_color palette[256];
-   png_byte tRNS[256];
-
-   memset(tRNS, 255, (sizeof tRNS));
-   memset(palette, 0, (sizeof palette));
-
-   for (i=num_trans=0; i<entries; ++i)
-   {
-      /* This gets automatically converted to sRGB with reversal of the
-       * pre-multiplication if the color-map has an alpha channel.
-       */
-      if ((format & PNG_FORMAT_FLAG_LINEAR) != 0)
-      {
-         png_const_uint_16p entry = png_voidcast(png_const_uint_16p, cmap);
-
-         entry += (unsigned int)i * channels;
-
-         if ((channels & 1) != 0) /* no alpha */
-         {
-            if (channels >= 3) /* RGB */
-            {
-               palette[i].blue = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
-                   entry[(2 ^ bgr)]);
-               palette[i].green = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
-                   entry[1]);
-               palette[i].red = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
-                   entry[bgr]);
-            }
-
-            else /* Gray */
-               palette[i].blue = palette[i].red = palette[i].green =
-                  (png_byte)PNG_sRGB_FROM_LINEAR(255 * *entry);
-         }
-
-         else /* alpha */
-         {
-            png_uint_16 alpha = entry[afirst ? 0 : channels-1];
-            png_byte alphabyte = (png_byte)PNG_DIV257(alpha);
-            png_uint_32 reciprocal = 0;
-
-            /* Calculate a reciprocal, as in the png_write_image_8bit code above
-             * this is designed to produce a value scaled to 255*65535 when
-             * divided by 128 (i.e. asr 7).
-             */
-            if (alphabyte > 0 && alphabyte < 255)
-               reciprocal = (((0xffff*0xff)<<7)+(alpha>>1))/alpha;
-
-            tRNS[i] = alphabyte;
-            if (alphabyte < 255)
-               num_trans = i+1;
-
-            if (channels >= 3) /* RGB */
-            {
-               palette[i].blue = png_unpremultiply(entry[afirst + (2 ^ bgr)],
-                   alpha, reciprocal);
-               palette[i].green = png_unpremultiply(entry[afirst + 1], alpha,
-                   reciprocal);
-               palette[i].red = png_unpremultiply(entry[afirst + bgr], alpha,
-                   reciprocal);
-            }
-
-            else /* gray */
-               palette[i].blue = palette[i].red = palette[i].green =
-                   png_unpremultiply(entry[afirst], alpha, reciprocal);
-         }
-      }
-
-      else /* Color-map has sRGB values */
-      {
-         png_const_bytep entry = png_voidcast(png_const_bytep, cmap);
-
-         entry += (unsigned int)i * channels;
-
-         switch (channels)
-         {
-            case 4:
-               tRNS[i] = entry[afirst ? 0 : 3];
-               if (tRNS[i] < 255)
-                  num_trans = i+1;
-               /* FALLTHROUGH */
-            case 3:
-               palette[i].blue = entry[afirst + (2 ^ bgr)];
-               palette[i].green = entry[afirst + 1];
-               palette[i].red = entry[afirst + bgr];
-               break;
-
-            case 2:
-               tRNS[i] = entry[1 ^ afirst];
-               if (tRNS[i] < 255)
-                  num_trans = i+1;
-               /* FALLTHROUGH */
-            case 1:
-               palette[i].blue = palette[i].red = palette[i].green =
-                  entry[afirst];
-               break;
-
-            default:
-               break;
-         }
-      }
-   }
-
-#   ifdef afirst
-#     undef afirst
-#   endif
-#   ifdef bgr
-#     undef bgr
-#   endif
-
-   png_set_PLTE(image->opaque->png_ptr, image->opaque->info_ptr, palette,
-       entries);
-
-   if (num_trans > 0)
-      png_set_tRNS(image->opaque->png_ptr, image->opaque->info_ptr, tRNS,
-          num_trans, NULL);
-
-   image->colormap_entries = (png_uint_32)entries;
-}
-
-static int
-png_image_write_main(png_voidp argument)
-{
-   png_image_write_control *display = png_voidcast(png_image_write_control*,
-       argument);
-   png_imagep image = display->image;
-   png_structrp png_ptr = image->opaque->png_ptr;
-   png_inforp info_ptr = image->opaque->info_ptr;
-   png_uint_32 format = image->format;
-
-   /* The following four ints are actually booleans */
-   int colormap = (format & PNG_FORMAT_FLAG_COLORMAP);
-   int linear = !colormap && (format & PNG_FORMAT_FLAG_LINEAR); /* input */
-   int alpha = !colormap && (format & PNG_FORMAT_FLAG_ALPHA);
-   int write_16bit = linear && (display->convert_to_8bit == 0);
-
-#   ifdef PNG_BENIGN_ERRORS_SUPPORTED
-      /* Make sure we error out on any bad situation */
-      png_set_benign_errors(png_ptr, 0/*error*/);
-#   endif
-
-   /* Default the 'row_stride' parameter if required, also check the row stride
-    * and total image size to ensure that they are within the system limits.
-    */
-   {
-      const unsigned int channels = PNG_IMAGE_PIXEL_CHANNELS(image->format);
-
-      if (image->width <= 0x7fffffffU/channels) /* no overflow */
-      {
-         png_uint_32 check;
-         const png_uint_32 png_row_stride = image->width * channels;
-
-         if (display->row_stride == 0)
-            display->row_stride = (png_int_32)/*SAFE*/png_row_stride;
-
-         if (display->row_stride < 0)
-            check = (png_uint_32)(-display->row_stride);
-
-         else
-            check = (png_uint_32)display->row_stride;
-
-         if (check >= png_row_stride)
-         {
-            /* Now check for overflow of the image buffer calculation; this
-             * limits the whole image size to 32 bits for API compatibility with
-             * the current, 32-bit, PNG_IMAGE_BUFFER_SIZE macro.
-             */
-            if (image->height > 0xffffffffU/png_row_stride)
-               png_error(image->opaque->png_ptr, "memory image too large");
-         }
-
-         else
-            png_error(image->opaque->png_ptr, "supplied row stride too small");
-      }
-
-      else
-         png_error(image->opaque->png_ptr, "image row stride too large");
-   }
-
-   /* Set the required transforms then write the rows in the correct order. */
-   if ((format & PNG_FORMAT_FLAG_COLORMAP) != 0)
-   {
-      if (display->colormap != NULL && image->colormap_entries > 0)
-      {
-         png_uint_32 entries = image->colormap_entries;
-
-         png_set_IHDR(png_ptr, info_ptr, image->width, image->height,
-             entries > 16 ? 8 : (entries > 4 ? 4 : (entries > 2 ? 2 : 1)),
-             PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
-             PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
-
-         png_image_set_PLTE(display);
-      }
-
-      else
-         png_error(image->opaque->png_ptr,
-             "no color-map for color-mapped image");
-   }
-
-   else
-      png_set_IHDR(png_ptr, info_ptr, image->width, image->height,
-          write_16bit ? 16 : 8,
-          ((format & PNG_FORMAT_FLAG_COLOR) ? PNG_COLOR_MASK_COLOR : 0) +
-          ((format & PNG_FORMAT_FLAG_ALPHA) ? PNG_COLOR_MASK_ALPHA : 0),
-          PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
-
-   /* Counter-intuitively the data transformations must be called *after*
-    * png_write_info, not before as in the read code, but the 'set' functions
-    * must still be called before.  Just set the color space information, never
-    * write an interlaced image.
-    */
-
-   if (write_16bit != 0)
-   {
-      /* The gamma here is 1.0 (linear) and the cHRM chunk matches sRGB. */
-      png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_LINEAR);
-
-      if ((image->flags & PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB) == 0)
-         png_set_cHRM_fixed(png_ptr, info_ptr,
-             /* color      x       y */
-             /* white */ 31270, 32900,
-             /* red   */ 64000, 33000,
-             /* green */ 30000, 60000,
-             /* blue  */ 15000,  6000
-         );
-   }
-
-   else if ((image->flags & PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB) == 0)
-      png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_PERCEPTUAL);
-
-   /* Else writing an 8-bit file and the *colors* aren't sRGB, but the 8-bit
-    * space must still be gamma encoded.
-    */
-   else
-      png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_sRGB_INVERSE);
-
-   /* Write the file header. */
-   png_write_info(png_ptr, info_ptr);
-
-   /* Now set up the data transformations (*after* the header is written),
-    * remove the handled transformations from the 'format' flags for checking.
-    *
-    * First check for a little endian system if writing 16-bit files.
-    */
-   if (write_16bit != 0)
-   {
-      PNG_CONST png_uint_16 le = 0x0001;
-
-      if ((*(png_const_bytep) & le) != 0)
-         png_set_swap(png_ptr);
-   }
-
-#   ifdef PNG_SIMPLIFIED_WRITE_BGR_SUPPORTED
-      if ((format & PNG_FORMAT_FLAG_BGR) != 0)
-      {
-         if (colormap == 0 && (format & PNG_FORMAT_FLAG_COLOR) != 0)
-            png_set_bgr(png_ptr);
-         format &= ~PNG_FORMAT_FLAG_BGR;
-      }
-#   endif
-
-#   ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
-      if ((format & PNG_FORMAT_FLAG_AFIRST) != 0)
-      {
-         if (colormap == 0 && (format & PNG_FORMAT_FLAG_ALPHA) != 0)
-            png_set_swap_alpha(png_ptr);
-         format &= ~PNG_FORMAT_FLAG_AFIRST;
-      }
-#   endif
-
-   /* If there are 16 or fewer color-map entries we wrote a lower bit depth
-    * above, but the application data is still byte packed.
-    */
-   if (colormap != 0 && image->colormap_entries <= 16)
-      png_set_packing(png_ptr);
-
-   /* That should have handled all (both) the transforms. */
-   if ((format & ~(png_uint_32)(PNG_FORMAT_FLAG_COLOR | PNG_FORMAT_FLAG_LINEAR |
-         PNG_FORMAT_FLAG_ALPHA | PNG_FORMAT_FLAG_COLORMAP)) != 0)
-      png_error(png_ptr, "png_write_image: unsupported transformation");
-
-   {
-      png_const_bytep row = png_voidcast(png_const_bytep, display->buffer);
-      ptrdiff_t row_bytes = display->row_stride;
-
-      if (linear != 0)
-         row_bytes *= (sizeof (png_uint_16));
-
-      if (row_bytes < 0)
-         row += (image->height-1) * (-row_bytes);
-
-      display->first_row = row;
-      display->row_bytes = row_bytes;
-   }
-
-   /* Apply 'fast' options if the flag is set. */
-   if ((image->flags & PNG_IMAGE_FLAG_FAST) != 0)
-   {
-      png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_NO_FILTERS);
-      /* NOTE: determined by experiment using pngstest, this reflects some
-       * balance between the time to write the image once and the time to read
-       * it about 50 times.  The speed-up in pngstest was about 10-20% of the
-       * total (user) time on a heavily loaded system.
-       */
-#   ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
-      png_set_compression_level(png_ptr, 3);
-#   endif
-   }
-
-   /* Check for the cases that currently require a pre-transform on the row
-    * before it is written.  This only applies when the input is 16-bit and
-    * either there is an alpha channel or it is converted to 8-bit.
-    */
-   if ((linear != 0 && alpha != 0 ) ||
-       (colormap == 0 && display->convert_to_8bit != 0))
-   {
-      png_bytep row = png_voidcast(png_bytep, png_malloc(png_ptr,
-          png_get_rowbytes(png_ptr, info_ptr)));
-      int result;
-
-      display->local_row = row;
-      if (write_16bit != 0)
-         result = png_safe_execute(image, png_write_image_16bit, display);
-      else
-         result = png_safe_execute(image, png_write_image_8bit, display);
-      display->local_row = NULL;
-
-      png_free(png_ptr, row);
-
-      /* Skip the 'write_end' on error: */
-      if (result == 0)
-         return 0;
-   }
-
-   /* Otherwise this is the case where the input is in a format currently
-    * supported by the rest of the libpng write code; call it directly.
-    */
-   else
-   {
-      png_const_bytep row = png_voidcast(png_const_bytep, display->first_row);
-      ptrdiff_t row_bytes = display->row_bytes;
-      png_uint_32 y = image->height;
-
-      for (; y > 0; --y)
-      {
-         png_write_row(png_ptr, row);
-         row += row_bytes;
-      }
-   }
-
-   png_write_end(png_ptr, info_ptr);
-   return 1;
-}
-
-
-static void (PNGCBAPI
-image_memory_write)(png_structp png_ptr, png_bytep/*const*/ data,
-    png_size_t size)
-{
-   png_image_write_control *display = png_voidcast(png_image_write_control*,
-       png_ptr->io_ptr/*backdoor: png_get_io_ptr(png_ptr)*/);
-   const png_alloc_size_t ob = display->output_bytes;
-
-   /* Check for overflow; this should never happen: */
-   if (size <= ((png_alloc_size_t)-1) - ob)
-   {
-      /* I don't think libpng ever does this, but just in case: */
-      if (size > 0)
-      {
-         if (display->memory_bytes >= ob+size) /* writing */
-            memcpy(display->memory+ob, data, size);
-
-         /* Always update the size: */
-         display->output_bytes = ob+size;
-      }
-   }
-
-   else
-      png_error(png_ptr, "png_image_write_to_memory: PNG too big");
-}
-
-static void (PNGCBAPI
-image_memory_flush)(png_structp png_ptr)
-{
-   PNG_UNUSED(png_ptr)
-}
-
-static int
-png_image_write_memory(png_voidp argument)
-{
-   png_image_write_control *display = png_voidcast(png_image_write_control*,
-       argument);
-
-   /* The rest of the memory-specific init and write_main in an error protected
-    * environment.  This case needs to use callbacks for the write operations
-    * since libpng has no built in support for writing to memory.
-    */
-   png_set_write_fn(display->image->opaque->png_ptr, display/*io_ptr*/,
-       image_memory_write, image_memory_flush);
-
-   return png_image_write_main(display);
-}
-
-int PNGAPI
-png_image_write_to_memory(png_imagep image, void *memory,
-    png_alloc_size_t * PNG_RESTRICT memory_bytes, int convert_to_8bit,
-    const void *buffer, png_int_32 row_stride, const void *colormap)
-{
-   /* Write the image to the given buffer, or count the bytes if it is NULL */
-   if (image != NULL && image->version == PNG_IMAGE_VERSION)
-   {
-      if (memory_bytes != NULL && buffer != NULL)
-      {
-         /* This is to give the caller an easier error detection in the NULL
-          * case and guard against uninitialized variable problems:
-          */
-         if (memory == NULL)
-            *memory_bytes = 0;
-
-         if (png_image_write_init(image) != 0)
-         {
-            png_image_write_control display;
-            int result;
-
-            memset(&display, 0, (sizeof display));
-            display.image = image;
-            display.buffer = buffer;
-            display.row_stride = row_stride;
-            display.colormap = colormap;
-            display.convert_to_8bit = convert_to_8bit;
-            display.memory = png_voidcast(png_bytep, memory);
-            display.memory_bytes = *memory_bytes;
-            display.output_bytes = 0;
-
-            result = png_safe_execute(image, png_image_write_memory, &display);
-            png_image_free(image);
-
-            /* write_memory returns true even if we ran out of buffer. */
-            if (result)
-            {
-               /* On out-of-buffer this function returns '0' but still updates
-                * memory_bytes:
-                */
-               if (memory != NULL && display.output_bytes > *memory_bytes)
-                  result = 0;
-
-               *memory_bytes = display.output_bytes;
-            }
-
-            return result;
-         }
-
-         else
-            return 0;
-      }
-
-      else
-         return png_image_error(image,
-             "png_image_write_to_memory: invalid argument");
-   }
-
-   else if (image != NULL)
-      return png_image_error(image,
-          "png_image_write_to_memory: incorrect PNG_IMAGE_VERSION");
-
-   else
-      return 0;
-}
-
-#ifdef PNG_SIMPLIFIED_WRITE_STDIO_SUPPORTED
-int PNGAPI
-png_image_write_to_stdio(png_imagep image, FILE *file, int convert_to_8bit,
-    const void *buffer, png_int_32 row_stride, const void *colormap)
-{
-   /* Write the image to the given (FILE*). */
-   if (image != NULL && image->version == PNG_IMAGE_VERSION)
-   {
-      if (file != NULL && buffer != NULL)
-      {
-         if (png_image_write_init(image) != 0)
-         {
-            png_image_write_control display;
-            int result;
-
-            /* This is slightly evil, but png_init_io doesn't do anything other
-             * than this and we haven't changed the standard IO functions so
-             * this saves a 'safe' function.
-             */
-            image->opaque->png_ptr->io_ptr = file;
-
-            memset(&display, 0, (sizeof display));
-            display.image = image;
-            display.buffer = buffer;
-            display.row_stride = row_stride;
-            display.colormap = colormap;
-            display.convert_to_8bit = convert_to_8bit;
-
-            result = png_safe_execute(image, png_image_write_main, &display);
-            png_image_free(image);
-            return result;
-         }
-
-         else
-            return 0;
-      }
-
-      else
-         return png_image_error(image,
-             "png_image_write_to_stdio: invalid argument");
-   }
-
-   else if (image != NULL)
-      return png_image_error(image,
-          "png_image_write_to_stdio: incorrect PNG_IMAGE_VERSION");
-
-   else
-      return 0;
-}
-
-int PNGAPI
-png_image_write_to_file(png_imagep image, const char *file_name,
-    int convert_to_8bit, const void *buffer, png_int_32 row_stride,
-    const void *colormap)
-{
-   /* Write the image to the named file. */
-   if (image != NULL && image->version == PNG_IMAGE_VERSION)
-   {
-      if (file_name != NULL && buffer != NULL)
-      {
-         FILE *fp = fopen(file_name, "wb");
-
-         if (fp != NULL)
-         {
-            if (png_image_write_to_stdio(image, fp, convert_to_8bit, buffer,
-                row_stride, colormap) != 0)
-            {
-               int error; /* from fflush/fclose */
-
-               /* Make sure the file is flushed correctly. */
-               if (fflush(fp) == 0 && ferror(fp) == 0)
-               {
-                  if (fclose(fp) == 0)
-                     return 1;
-
-                  error = errno; /* from fclose */
-               }
-
-               else
-               {
-                  error = errno; /* from fflush or ferror */
-                  (void)fclose(fp);
-               }
-
-               (void)remove(file_name);
-               /* The image has already been cleaned up; this is just used to
-                * set the error (because the original write succeeded).
-                */
-               return png_image_error(image, strerror(error));
-            }
-
-            else
-            {
-               /* Clean up: just the opened file. */
-               (void)fclose(fp);
-               (void)remove(file_name);
-               return 0;
-            }
-         }
-
-         else
-            return png_image_error(image, strerror(errno));
-      }
-
-      else
-         return png_image_error(image,
-             "png_image_write_to_file: invalid argument");
-   }
-
-   else if (image != NULL)
-      return png_image_error(image,
-          "png_image_write_to_file: incorrect PNG_IMAGE_VERSION");
-
-   else
-      return 0;
-}
-#endif /* SIMPLIFIED_WRITE_STDIO */
-#endif /* SIMPLIFIED_WRITE */
-#endif /* WRITE */
diff --git a/src/png/libpng/pngwtran.c b/src/png/libpng/pngwtran.c
deleted file mode 100644
index 377b43e5c..000000000
--- a/src/png/libpng/pngwtran.c
+++ /dev/null
@@ -1,576 +0,0 @@
-
-/* pngwtran.c - transforms the data in a row for PNG writers
- *
- * Last changed in libpng 1.6.26 [October 20, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#include "pngpriv.h"
-
-#ifdef PNG_WRITE_SUPPORTED
-#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
-
-#ifdef PNG_WRITE_PACK_SUPPORTED
-/* Pack pixels into bytes.  Pass the true bit depth in bit_depth.  The
- * row_info bit depth should be 8 (one pixel per byte).  The channels
- * should be 1 (this only happens on grayscale and paletted images).
- */
-static void
-png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
-{
-   png_debug(1, "in png_do_pack");
-
-   if (row_info->bit_depth == 8 &&
-      row_info->channels == 1)
-   {
-      switch ((int)bit_depth)
-      {
-         case 1:
-         {
-            png_bytep sp, dp;
-            int mask, v;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            sp = row;
-            dp = row;
-            mask = 0x80;
-            v = 0;
-
-            for (i = 0; i < row_width; i++)
-            {
-               if (*sp != 0)
-                  v |= mask;
-
-               sp++;
-
-               if (mask > 1)
-                  mask >>= 1;
-
-               else
-               {
-                  mask = 0x80;
-                  *dp = (png_byte)v;
-                  dp++;
-                  v = 0;
-               }
-            }
-
-            if (mask != 0x80)
-               *dp = (png_byte)v;
-
-            break;
-         }
-
-         case 2:
-         {
-            png_bytep sp, dp;
-            unsigned int shift;
-            int v;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            sp = row;
-            dp = row;
-            shift = 6;
-            v = 0;
-
-            for (i = 0; i < row_width; i++)
-            {
-               png_byte value;
-
-               value = (png_byte)(*sp & 0x03);
-               v |= (value << shift);
-
-               if (shift == 0)
-               {
-                  shift = 6;
-                  *dp = (png_byte)v;
-                  dp++;
-                  v = 0;
-               }
-
-               else
-                  shift -= 2;
-
-               sp++;
-            }
-
-            if (shift != 6)
-               *dp = (png_byte)v;
-
-            break;
-         }
-
-         case 4:
-         {
-            png_bytep sp, dp;
-            unsigned int shift;
-            int v;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            sp = row;
-            dp = row;
-            shift = 4;
-            v = 0;
-
-            for (i = 0; i < row_width; i++)
-            {
-               png_byte value;
-
-               value = (png_byte)(*sp & 0x0f);
-               v |= (value << shift);
-
-               if (shift == 0)
-               {
-                  shift = 4;
-                  *dp = (png_byte)v;
-                  dp++;
-                  v = 0;
-               }
-
-               else
-                  shift -= 4;
-
-               sp++;
-            }
-
-            if (shift != 4)
-               *dp = (png_byte)v;
-
-            break;
-         }
-
-         default:
-            break;
-      }
-
-      row_info->bit_depth = (png_byte)bit_depth;
-      row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels);
-      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
-          row_info->width);
-   }
-}
-#endif
-
-#ifdef PNG_WRITE_SHIFT_SUPPORTED
-/* Shift pixel values to take advantage of whole range.  Pass the
- * true number of bits in bit_depth.  The row should be packed
- * according to row_info->bit_depth.  Thus, if you had a row of
- * bit depth 4, but the pixels only had values from 0 to 7, you
- * would pass 3 as bit_depth, and this routine would translate the
- * data to 0 to 15.
- */
-static void
-png_do_shift(png_row_infop row_info, png_bytep row,
-    png_const_color_8p bit_depth)
-{
-   png_debug(1, "in png_do_shift");
-
-   if (row_info->color_type != PNG_COLOR_TYPE_PALETTE)
-   {
-      int shift_start[4], shift_dec[4];
-      unsigned int channels = 0;
-
-      if ((row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
-      {
-         shift_start[channels] = row_info->bit_depth - bit_depth->red;
-         shift_dec[channels] = bit_depth->red;
-         channels++;
-
-         shift_start[channels] = row_info->bit_depth - bit_depth->green;
-         shift_dec[channels] = bit_depth->green;
-         channels++;
-
-         shift_start[channels] = row_info->bit_depth - bit_depth->blue;
-         shift_dec[channels] = bit_depth->blue;
-         channels++;
-      }
-
-      else
-      {
-         shift_start[channels] = row_info->bit_depth - bit_depth->gray;
-         shift_dec[channels] = bit_depth->gray;
-         channels++;
-      }
-
-      if ((row_info->color_type & PNG_COLOR_MASK_ALPHA) != 0)
-      {
-         shift_start[channels] = row_info->bit_depth - bit_depth->alpha;
-         shift_dec[channels] = bit_depth->alpha;
-         channels++;
-      }
-
-      /* With low row depths, could only be grayscale, so one channel */
-      if (row_info->bit_depth < 8)
-      {
-         png_bytep bp = row;
-         png_size_t i;
-         unsigned int mask;
-         png_size_t row_bytes = row_info->rowbytes;
-
-         if (bit_depth->gray == 1 && row_info->bit_depth == 2)
-            mask = 0x55;
-
-         else if (row_info->bit_depth == 4 && bit_depth->gray == 3)
-            mask = 0x11;
-
-         else
-            mask = 0xff;
-
-         for (i = 0; i < row_bytes; i++, bp++)
-         {
-            int j;
-            unsigned int v, out;
-
-            v = *bp;
-            out = 0;
-
-            for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0])
-            {
-               if (j > 0)
-                  out |= v << j;
-
-               else
-                  out |= (v >> (-j)) & mask;
-            }
-
-            *bp = (png_byte)(out & 0xff);
-         }
-      }
-
-      else if (row_info->bit_depth == 8)
-      {
-         png_bytep bp = row;
-         png_uint_32 i;
-         png_uint_32 istop = channels * row_info->width;
-
-         for (i = 0; i < istop; i++, bp++)
-         {
-
-            const unsigned int c = i%channels;
-            int j;
-            unsigned int v, out;
-
-            v = *bp;
-            out = 0;
-
-            for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
-            {
-               if (j > 0)
-                  out |= v << j;
-
-               else
-                  out |= v >> (-j);
-            }
-
-            *bp = (png_byte)(out & 0xff);
-         }
-      }
-
-      else
-      {
-         png_bytep bp;
-         png_uint_32 i;
-         png_uint_32 istop = channels * row_info->width;
-
-         for (bp = row, i = 0; i < istop; i++)
-         {
-            const unsigned int c = i%channels;
-            int j;
-            unsigned int value, v;
-
-            v = png_get_uint_16(bp);
-            value = 0;
-
-            for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
-            {
-               if (j > 0)
-                  value |= v << j;
-
-               else
-                  value |= v >> (-j);
-            }
-            *bp++ = (png_byte)((value >> 8) & 0xff);
-            *bp++ = (png_byte)(value & 0xff);
-         }
-      }
-   }
-}
-#endif
-
-#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
-static void
-png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
-{
-   png_debug(1, "in png_do_write_swap_alpha");
-
-   {
-      if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
-      {
-         if (row_info->bit_depth == 8)
-         {
-            /* This converts from ARGB to RGBA */
-            png_bytep sp, dp;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            for (i = 0, sp = dp = row; i < row_width; i++)
-            {
-               png_byte save = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = save;
-            }
-         }
-
-#ifdef PNG_WRITE_16BIT_SUPPORTED
-         else
-         {
-            /* This converts from AARRGGBB to RRGGBBAA */
-            png_bytep sp, dp;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            for (i = 0, sp = dp = row; i < row_width; i++)
-            {
-               png_byte save[2];
-               save[0] = *(sp++);
-               save[1] = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = save[0];
-               *(dp++) = save[1];
-            }
-         }
-#endif /* WRITE_16BIT */
-      }
-
-      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
-      {
-         if (row_info->bit_depth == 8)
-         {
-            /* This converts from AG to GA */
-            png_bytep sp, dp;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            for (i = 0, sp = dp = row; i < row_width; i++)
-            {
-               png_byte save = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = save;
-            }
-         }
-
-#ifdef PNG_WRITE_16BIT_SUPPORTED
-         else
-         {
-            /* This converts from AAGG to GGAA */
-            png_bytep sp, dp;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            for (i = 0, sp = dp = row; i < row_width; i++)
-            {
-               png_byte save[2];
-               save[0] = *(sp++);
-               save[1] = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = save[0];
-               *(dp++) = save[1];
-            }
-         }
-#endif /* WRITE_16BIT */
-      }
-   }
-}
-#endif
-
-#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
-static void
-png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
-{
-   png_debug(1, "in png_do_write_invert_alpha");
-
-   {
-      if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
-      {
-         if (row_info->bit_depth == 8)
-         {
-            /* This inverts the alpha channel in RGBA */
-            png_bytep sp, dp;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            for (i = 0, sp = dp = row; i < row_width; i++)
-            {
-               /* Does nothing
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               */
-               sp+=3; dp = sp;
-               *dp = (png_byte)(255 - *(sp++));
-            }
-         }
-
-#ifdef PNG_WRITE_16BIT_SUPPORTED
-         else
-         {
-            /* This inverts the alpha channel in RRGGBBAA */
-            png_bytep sp, dp;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            for (i = 0, sp = dp = row; i < row_width; i++)
-            {
-               /* Does nothing
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               */
-               sp+=6; dp = sp;
-               *(dp++) = (png_byte)(255 - *(sp++));
-               *dp     = (png_byte)(255 - *(sp++));
-            }
-         }
-#endif /* WRITE_16BIT */
-      }
-
-      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
-      {
-         if (row_info->bit_depth == 8)
-         {
-            /* This inverts the alpha channel in GA */
-            png_bytep sp, dp;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            for (i = 0, sp = dp = row; i < row_width; i++)
-            {
-               *(dp++) = *(sp++);
-               *(dp++) = (png_byte)(255 - *(sp++));
-            }
-         }
-
-#ifdef PNG_WRITE_16BIT_SUPPORTED
-         else
-         {
-            /* This inverts the alpha channel in GGAA */
-            png_bytep sp, dp;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            for (i = 0, sp = dp = row; i < row_width; i++)
-            {
-               /* Does nothing
-               *(dp++) = *(sp++);
-               *(dp++) = *(sp++);
-               */
-               sp+=2; dp = sp;
-               *(dp++) = (png_byte)(255 - *(sp++));
-               *dp     = (png_byte)(255 - *(sp++));
-            }
-         }
-#endif /* WRITE_16BIT */
-      }
-   }
-}
-#endif
-
-/* Transform the data according to the user's wishes.  The order of
- * transformations is significant.
- */
-void /* PRIVATE */
-png_do_write_transformations(png_structrp png_ptr, png_row_infop row_info)
-{
-   png_debug(1, "in png_do_write_transformations");
-
-   if (png_ptr == NULL)
-      return;
-
-#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
-   if ((png_ptr->transformations & PNG_USER_TRANSFORM) != 0)
-      if (png_ptr->write_user_transform_fn != NULL)
-         (*(png_ptr->write_user_transform_fn)) /* User write transform
-                                                 function */
-             (png_ptr,  /* png_ptr */
-             row_info,  /* row_info: */
-                /*  png_uint_32 width;       width of row */
-                /*  png_size_t rowbytes;     number of bytes in row */
-                /*  png_byte color_type;     color type of pixels */
-                /*  png_byte bit_depth;      bit depth of samples */
-                /*  png_byte channels;       number of channels (1-4) */
-                /*  png_byte pixel_depth;    bits per pixel (depth*channels) */
-             png_ptr->row_buf + 1);      /* start of pixel data for row */
-#endif
-
-#ifdef PNG_WRITE_FILLER_SUPPORTED
-   if ((png_ptr->transformations & PNG_FILLER) != 0)
-      png_do_strip_channel(row_info, png_ptr->row_buf + 1,
-          !(png_ptr->flags & PNG_FLAG_FILLER_AFTER));
-#endif
-
-#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
-   if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
-      png_do_packswap(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_WRITE_PACK_SUPPORTED
-   if ((png_ptr->transformations & PNG_PACK) != 0)
-      png_do_pack(row_info, png_ptr->row_buf + 1,
-          (png_uint_32)png_ptr->bit_depth);
-#endif
-
-#ifdef PNG_WRITE_SWAP_SUPPORTED
-#  ifdef PNG_16BIT_SUPPORTED
-   if ((png_ptr->transformations & PNG_SWAP_BYTES) != 0)
-      png_do_swap(row_info, png_ptr->row_buf + 1);
-#  endif
-#endif
-
-#ifdef PNG_WRITE_SHIFT_SUPPORTED
-   if ((png_ptr->transformations & PNG_SHIFT) != 0)
-      png_do_shift(row_info, png_ptr->row_buf + 1,
-           &(png_ptr->shift));
-#endif
-
-#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
-   if ((png_ptr->transformations & PNG_SWAP_ALPHA) != 0)
-      png_do_write_swap_alpha(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
-   if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0)
-      png_do_write_invert_alpha(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_WRITE_BGR_SUPPORTED
-   if ((png_ptr->transformations & PNG_BGR) != 0)
-      png_do_bgr(row_info, png_ptr->row_buf + 1);
-#endif
-
-#ifdef PNG_WRITE_INVERT_SUPPORTED
-   if ((png_ptr->transformations & PNG_INVERT_MONO) != 0)
-      png_do_invert(row_info, png_ptr->row_buf + 1);
-#endif
-}
-#endif /* WRITE_TRANSFORMS */
-#endif /* WRITE */
diff --git a/src/png/libpng/pngwutil.c b/src/png/libpng/pngwutil.c
deleted file mode 100644
index 0d4fb1336..000000000
--- a/src/png/libpng/pngwutil.c
+++ /dev/null
@@ -1,2784 +0,0 @@
-
-/* pngwutil.c - utilities to write a PNG file
- *
- * Last changed in libpng 1.6.32 [August 24, 2017]
- * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#include "pngpriv.h"
-
-#ifdef PNG_WRITE_SUPPORTED
-
-#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED
-/* Place a 32-bit number into a buffer in PNG byte order.  We work
- * with unsigned numbers for convenience, although one supported
- * ancillary chunk uses signed (two's complement) numbers.
- */
-void PNGAPI
-png_save_uint_32(png_bytep buf, png_uint_32 i)
-{
-   buf[0] = (png_byte)((i >> 24) & 0xffU);
-   buf[1] = (png_byte)((i >> 16) & 0xffU);
-   buf[2] = (png_byte)((i >>  8) & 0xffU);
-   buf[3] = (png_byte)( i        & 0xffU);
-}
-
-/* Place a 16-bit number into a buffer in PNG byte order.
- * The parameter is declared unsigned int, not png_uint_16,
- * just to avoid potential problems on pre-ANSI C compilers.
- */
-void PNGAPI
-png_save_uint_16(png_bytep buf, unsigned int i)
-{
-   buf[0] = (png_byte)((i >> 8) & 0xffU);
-   buf[1] = (png_byte)( i       & 0xffU);
-}
-#endif
-
-/* Simple function to write the signature.  If we have already written
- * the magic bytes of the signature, or more likely, the PNG stream is
- * being embedded into another stream and doesn't need its own signature,
- * we should call png_set_sig_bytes() to tell libpng how many of the
- * bytes have already been written.
- */
-void PNGAPI
-png_write_sig(png_structrp png_ptr)
-{
-   png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
-
-#ifdef PNG_IO_STATE_SUPPORTED
-   /* Inform the I/O callback that the signature is being written */
-   png_ptr->io_state = PNG_IO_WRITING | PNG_IO_SIGNATURE;
-#endif
-
-   /* Write the rest of the 8 byte signature */
-   png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes],
-       (png_size_t)(8 - png_ptr->sig_bytes));
-
-   if (png_ptr->sig_bytes < 3)
-      png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
-}
-
-/* Write the start of a PNG chunk.  The type is the chunk type.
- * The total_length is the sum of the lengths of all the data you will be
- * passing in png_write_chunk_data().
- */
-static void
-png_write_chunk_header(png_structrp png_ptr, png_uint_32 chunk_name,
-    png_uint_32 length)
-{
-   png_byte buf[8];
-
-#if defined(PNG_DEBUG) && (PNG_DEBUG > 0)
-   PNG_CSTRING_FROM_CHUNK(buf, chunk_name);
-   png_debug2(0, "Writing %s chunk, length = %lu", buf, (unsigned long)length);
-#endif
-
-   if (png_ptr == NULL)
-      return;
-
-#ifdef PNG_IO_STATE_SUPPORTED
-   /* Inform the I/O callback that the chunk header is being written.
-    * PNG_IO_CHUNK_HDR requires a single I/O call.
-    */
-   png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_HDR;
-#endif
-
-   /* Write the length and the chunk name */
-   png_save_uint_32(buf, length);
-   png_save_uint_32(buf + 4, chunk_name);
-   png_write_data(png_ptr, buf, 8);
-
-   /* Put the chunk name into png_ptr->chunk_name */
-   png_ptr->chunk_name = chunk_name;
-
-   /* Reset the crc and run it over the chunk name */
-   png_reset_crc(png_ptr);
-
-   png_calculate_crc(png_ptr, buf + 4, 4);
-
-#ifdef PNG_IO_STATE_SUPPORTED
-   /* Inform the I/O callback that chunk data will (possibly) be written.
-    * PNG_IO_CHUNK_DATA does NOT require a specific number of I/O calls.
-    */
-   png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_DATA;
-#endif
-}
-
-void PNGAPI
-png_write_chunk_start(png_structrp png_ptr, png_const_bytep chunk_string,
-    png_uint_32 length)
-{
-   png_write_chunk_header(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), length);
-}
-
-/* Write the data of a PNG chunk started with png_write_chunk_header().
- * Note that multiple calls to this function are allowed, and that the
- * sum of the lengths from these calls *must* add up to the total_length
- * given to png_write_chunk_header().
- */
-void PNGAPI
-png_write_chunk_data(png_structrp png_ptr, png_const_bytep data,
-    png_size_t length)
-{
-   /* Write the data, and run the CRC over it */
-   if (png_ptr == NULL)
-      return;
-
-   if (data != NULL && length > 0)
-   {
-      png_write_data(png_ptr, data, length);
-
-      /* Update the CRC after writing the data,
-       * in case the user I/O routine alters it.
-       */
-      png_calculate_crc(png_ptr, data, length);
-   }
-}
-
-/* Finish a chunk started with png_write_chunk_header(). */
-void PNGAPI
-png_write_chunk_end(png_structrp png_ptr)
-{
-   png_byte buf[4];
-
-   if (png_ptr == NULL) return;
-
-#ifdef PNG_IO_STATE_SUPPORTED
-   /* Inform the I/O callback that the chunk CRC is being written.
-    * PNG_IO_CHUNK_CRC requires a single I/O function call.
-    */
-   png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_CRC;
-#endif
-
-   /* Write the crc in a single operation */
-   png_save_uint_32(buf, png_ptr->crc);
-
-   png_write_data(png_ptr, buf, (png_size_t)4);
-}
-
-/* Write a PNG chunk all at once.  The type is an array of ASCII characters
- * representing the chunk name.  The array must be at least 4 bytes in
- * length, and does not need to be null terminated.  To be safe, pass the
- * pre-defined chunk names here, and if you need a new one, define it
- * where the others are defined.  The length is the length of the data.
- * All the data must be present.  If that is not possible, use the
- * png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end()
- * functions instead.
- */
-static void
-png_write_complete_chunk(png_structrp png_ptr, png_uint_32 chunk_name,
-    png_const_bytep data, png_size_t length)
-{
-   if (png_ptr == NULL)
-      return;
-
-   /* On 64-bit architectures 'length' may not fit in a png_uint_32. */
-   if (length > PNG_UINT_31_MAX)
-      png_error(png_ptr, "length exceeds PNG maximum");
-
-   png_write_chunk_header(png_ptr, chunk_name, (png_uint_32)length);
-   png_write_chunk_data(png_ptr, data, length);
-   png_write_chunk_end(png_ptr);
-}
-
-/* This is the API that calls the internal function above. */
-void PNGAPI
-png_write_chunk(png_structrp png_ptr, png_const_bytep chunk_string,
-    png_const_bytep data, png_size_t length)
-{
-   png_write_complete_chunk(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), data,
-       length);
-}
-
-/* This is used below to find the size of an image to pass to png_deflate_claim,
- * so it only needs to be accurate if the size is less than 16384 bytes (the
- * point at which a lower LZ window size can be used.)
- */
-static png_alloc_size_t
-png_image_size(png_structrp png_ptr)
-{
-   /* Only return sizes up to the maximum of a png_uint_32; do this by limiting
-    * the width and height used to 15 bits.
-    */
-   png_uint_32 h = png_ptr->height;
-
-   if (png_ptr->rowbytes < 32768 && h < 32768)
-   {
-      if (png_ptr->interlaced != 0)
-      {
-         /* Interlacing makes the image larger because of the replication of
-          * both the filter byte and the padding to a byte boundary.
-          */
-         png_uint_32 w = png_ptr->width;
-         unsigned int pd = png_ptr->pixel_depth;
-         png_alloc_size_t cb_base;
-         int pass;
-
-         for (cb_base=0, pass=0; pass<=6; ++pass)
-         {
-            png_uint_32 pw = PNG_PASS_COLS(w, pass);
-
-            if (pw > 0)
-               cb_base += (PNG_ROWBYTES(pd, pw)+1) * PNG_PASS_ROWS(h, pass);
-         }
-
-         return cb_base;
-      }
-
-      else
-         return (png_ptr->rowbytes+1) * h;
-   }
-
-   else
-      return 0xffffffffU;
-}
-
-#ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED
-   /* This is the code to hack the first two bytes of the deflate stream (the
-    * deflate header) to correct the windowBits value to match the actual data
-    * size.  Note that the second argument is the *uncompressed* size but the
-    * first argument is the *compressed* data (and it must be deflate
-    * compressed.)
-    */
-static void
-optimize_cmf(png_bytep data, png_alloc_size_t data_size)
-{
-   /* Optimize the CMF field in the zlib stream.  The resultant zlib stream is
-    * still compliant to the stream specification.
-    */
-   if (data_size <= 16384) /* else windowBits must be 15 */
-   {
-      unsigned int z_cmf = data[0];  /* zlib compression method and flags */
-
-      if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70)
-      {
-         unsigned int z_cinfo;
-         unsigned int half_z_window_size;
-
-         z_cinfo = z_cmf >> 4;
-         half_z_window_size = 1U << (z_cinfo + 7);
-
-         if (data_size <= half_z_window_size) /* else no change */
-         {
-            unsigned int tmp;
-
-            do
-            {
-               half_z_window_size >>= 1;
-               --z_cinfo;
-            }
-            while (z_cinfo > 0 && data_size <= half_z_window_size);
-
-            z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4);
-
-            data[0] = (png_byte)z_cmf;
-            tmp = data[1] & 0xe0;
-            tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f;
-            data[1] = (png_byte)tmp;
-         }
-      }
-   }
-}
-#endif /* WRITE_OPTIMIZE_CMF */
-
-/* Initialize the compressor for the appropriate type of compression. */
-static int
-png_deflate_claim(png_structrp png_ptr, png_uint_32 owner,
-    png_alloc_size_t data_size)
-{
-   if (png_ptr->zowner != 0)
-   {
-#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED)
-      char msg[64];
-
-      PNG_STRING_FROM_CHUNK(msg, owner);
-      msg[4] = ':';
-      msg[5] = ' ';
-      PNG_STRING_FROM_CHUNK(msg+6, png_ptr->zowner);
-      /* So the message that results is "<chunk> using zstream"; this is an
-       * internal error, but is very useful for debugging.  i18n requirements
-       * are minimal.
-       */
-      (void)png_safecat(msg, (sizeof msg), 10, " using zstream");
-#endif
-#if PNG_RELEASE_BUILD
-         png_warning(png_ptr, msg);
-
-         /* Attempt sane error recovery */
-         if (png_ptr->zowner == png_IDAT) /* don't steal from IDAT */
-         {
-            png_ptr->zstream.msg = PNGZ_MSG_CAST("in use by IDAT");
-            return Z_STREAM_ERROR;
-         }
-
-         png_ptr->zowner = 0;
-#else
-         png_error(png_ptr, msg);
-#endif
-   }
-
-   {
-      int level = png_ptr->zlib_level;
-      int method = png_ptr->zlib_method;
-      int windowBits = png_ptr->zlib_window_bits;
-      int memLevel = png_ptr->zlib_mem_level;
-      int strategy; /* set below */
-      int ret; /* zlib return code */
-
-      if (owner == png_IDAT)
-      {
-         if ((png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY) != 0)
-            strategy = png_ptr->zlib_strategy;
-
-         else if (png_ptr->do_filter != PNG_FILTER_NONE)
-            strategy = PNG_Z_DEFAULT_STRATEGY;
-
-         else
-            strategy = PNG_Z_DEFAULT_NOFILTER_STRATEGY;
-      }
-
-      else
-      {
-#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
-            level = png_ptr->zlib_text_level;
-            method = png_ptr->zlib_text_method;
-            windowBits = png_ptr->zlib_text_window_bits;
-            memLevel = png_ptr->zlib_text_mem_level;
-            strategy = png_ptr->zlib_text_strategy;
-#else
-            /* If customization is not supported the values all come from the
-             * IDAT values except for the strategy, which is fixed to the
-             * default.  (This is the pre-1.6.0 behavior too, although it was
-             * implemented in a very different way.)
-             */
-            strategy = Z_DEFAULT_STRATEGY;
-#endif
-      }
-
-      /* Adjust 'windowBits' down if larger than 'data_size'; to stop this
-       * happening just pass 32768 as the data_size parameter.  Notice that zlib
-       * requires an extra 262 bytes in the window in addition to the data to be
-       * able to see the whole of the data, so if data_size+262 takes us to the
-       * next windowBits size we need to fix up the value later.  (Because even
-       * though deflate needs the extra window, inflate does not!)
-       */
-      if (data_size <= 16384)
-      {
-         /* IMPLEMENTATION NOTE: this 'half_window_size' stuff is only here to
-          * work round a Microsoft Visual C misbehavior which, contrary to C-90,
-          * widens the result of the following shift to 64-bits if (and,
-          * apparently, only if) it is used in a test.
-          */
-         unsigned int half_window_size = 1U << (windowBits-1);
-
-         while (data_size + 262 <= half_window_size)
-         {
-            half_window_size >>= 1;
-            --windowBits;
-         }
-      }
-
-      /* Check against the previous initialized values, if any. */
-      if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) != 0 &&
-         (png_ptr->zlib_set_level != level ||
-         png_ptr->zlib_set_method != method ||
-         png_ptr->zlib_set_window_bits != windowBits ||
-         png_ptr->zlib_set_mem_level != memLevel ||
-         png_ptr->zlib_set_strategy != strategy))
-      {
-         if (deflateEnd(&png_ptr->zstream) != Z_OK)
-            png_warning(png_ptr, "deflateEnd failed (ignored)");
-
-         png_ptr->flags &= ~PNG_FLAG_ZSTREAM_INITIALIZED;
-      }
-
-      /* For safety clear out the input and output pointers (currently zlib
-       * doesn't use them on Init, but it might in the future).
-       */
-      png_ptr->zstream.next_in = NULL;
-      png_ptr->zstream.avail_in = 0;
-      png_ptr->zstream.next_out = NULL;
-      png_ptr->zstream.avail_out = 0;
-
-      /* Now initialize if required, setting the new parameters, otherwise just
-       * do a simple reset to the previous parameters.
-       */
-      if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) != 0)
-         ret = deflateReset(&png_ptr->zstream);
-
-      else
-      {
-         ret = deflateInit2(&png_ptr->zstream, level, method, windowBits,
-             memLevel, strategy);
-
-         if (ret == Z_OK)
-            png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED;
-      }
-
-      /* The return code is from either deflateReset or deflateInit2; they have
-       * pretty much the same set of error codes.
-       */
-      if (ret == Z_OK)
-         png_ptr->zowner = owner;
-
-      else
-         png_zstream_error(png_ptr, ret);
-
-      return ret;
-   }
-}
-
-/* Clean up (or trim) a linked list of compression buffers. */
-void /* PRIVATE */
-png_free_buffer_list(png_structrp png_ptr, png_compression_bufferp *listp)
-{
-   png_compression_bufferp list = *listp;
-
-   if (list != NULL)
-   {
-      *listp = NULL;
-
-      do
-      {
-         png_compression_bufferp next = list->next;
-
-         png_free(png_ptr, list);
-         list = next;
-      }
-      while (list != NULL);
-   }
-}
-
-#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED
-/* This pair of functions encapsulates the operation of (a) compressing a
- * text string, and (b) issuing it later as a series of chunk data writes.
- * The compression_state structure is shared context for these functions
- * set up by the caller to allow access to the relevant local variables.
- *
- * compression_buffer (new in 1.6.0) is just a linked list of zbuffer_size
- * temporary buffers.  From 1.6.0 it is retained in png_struct so that it will
- * be correctly freed in the event of a write error (previous implementations
- * just leaked memory.)
- */
-typedef struct
-{
-   png_const_bytep      input;        /* The uncompressed input data */
-   png_alloc_size_t     input_len;    /* Its length */
-   png_uint_32          output_len;   /* Final compressed length */
-   png_byte             output[1024]; /* First block of output */
-} compression_state;
-
-static void
-png_text_compress_init(compression_state *comp, png_const_bytep input,
-    png_alloc_size_t input_len)
-{
-   comp->input = input;
-   comp->input_len = input_len;
-   comp->output_len = 0;
-}
-
-/* Compress the data in the compression state input */
-static int
-png_text_compress(png_structrp png_ptr, png_uint_32 chunk_name,
-    compression_state *comp, png_uint_32 prefix_len)
-{
-   int ret;
-
-   /* To find the length of the output it is necessary to first compress the
-    * input. The result is buffered rather than using the two-pass algorithm
-    * that is used on the inflate side; deflate is assumed to be slower and a
-    * PNG writer is assumed to have more memory available than a PNG reader.
-    *
-    * IMPLEMENTATION NOTE: the zlib API deflateBound() can be used to find an
-    * upper limit on the output size, but it is always bigger than the input
-    * size so it is likely to be more efficient to use this linked-list
-    * approach.
-    */
-   ret = png_deflate_claim(png_ptr, chunk_name, comp->input_len);
-
-   if (ret != Z_OK)
-      return ret;
-
-   /* Set up the compression buffers, we need a loop here to avoid overflowing a
-    * uInt.  Use ZLIB_IO_MAX to limit the input.  The output is always limited
-    * by the output buffer size, so there is no need to check that.  Since this
-    * is ANSI-C we know that an 'int', hence a uInt, is always at least 16 bits
-    * in size.
-    */
-   {
-      png_compression_bufferp *end = &png_ptr->zbuffer_list;
-      png_alloc_size_t input_len = comp->input_len; /* may be zero! */
-      png_uint_32 output_len;
-
-      /* zlib updates these for us: */
-      png_ptr->zstream.next_in = PNGZ_INPUT_CAST(comp->input);
-      png_ptr->zstream.avail_in = 0; /* Set below */
-      png_ptr->zstream.next_out = comp->output;
-      png_ptr->zstream.avail_out = (sizeof comp->output);
-
-      output_len = png_ptr->zstream.avail_out;
-
-      do
-      {
-         uInt avail_in = ZLIB_IO_MAX;
-
-         if (avail_in > input_len)
-            avail_in = (uInt)input_len;
-
-         input_len -= avail_in;
-
-         png_ptr->zstream.avail_in = avail_in;
-
-         if (png_ptr->zstream.avail_out == 0)
-         {
-            png_compression_buffer *next;
-
-            /* Chunk data is limited to 2^31 bytes in length, so the prefix
-             * length must be counted here.
-             */
-            if (output_len + prefix_len > PNG_UINT_31_MAX)
-            {
-               ret = Z_MEM_ERROR;
-               break;
-            }
-
-            /* Need a new (malloc'ed) buffer, but there may be one present
-             * already.
-             */
-            next = *end;
-            if (next == NULL)
-            {
-               next = png_voidcast(png_compression_bufferp, png_malloc_base
-                  (png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr)));
-
-               if (next == NULL)
-               {
-                  ret = Z_MEM_ERROR;
-                  break;
-               }
-
-               /* Link in this buffer (so that it will be freed later) */
-               next->next = NULL;
-               *end = next;
-            }
-
-            png_ptr->zstream.next_out = next->output;
-            png_ptr->zstream.avail_out = png_ptr->zbuffer_size;
-            output_len += png_ptr->zstream.avail_out;
-
-            /* Move 'end' to the next buffer pointer. */
-            end = &next->next;
-         }
-
-         /* Compress the data */
-         ret = deflate(&png_ptr->zstream,
-             input_len > 0 ? Z_NO_FLUSH : Z_FINISH);
-
-         /* Claw back input data that was not consumed (because avail_in is
-          * reset above every time round the loop).
-          */
-         input_len += png_ptr->zstream.avail_in;
-         png_ptr->zstream.avail_in = 0; /* safety */
-      }
-      while (ret == Z_OK);
-
-      /* There may be some space left in the last output buffer. This needs to
-       * be subtracted from output_len.
-       */
-      output_len -= png_ptr->zstream.avail_out;
-      png_ptr->zstream.avail_out = 0; /* safety */
-      comp->output_len = output_len;
-
-      /* Now double check the output length, put in a custom message if it is
-       * too long.  Otherwise ensure the z_stream::msg pointer is set to
-       * something.
-       */
-      if (output_len + prefix_len >= PNG_UINT_31_MAX)
-      {
-         png_ptr->zstream.msg = PNGZ_MSG_CAST("compressed data too long");
-         ret = Z_MEM_ERROR;
-      }
-
-      else
-         png_zstream_error(png_ptr, ret);
-
-      /* Reset zlib for another zTXt/iTXt or image data */
-      png_ptr->zowner = 0;
-
-      /* The only success case is Z_STREAM_END, input_len must be 0; if not this
-       * is an internal error.
-       */
-      if (ret == Z_STREAM_END && input_len == 0)
-      {
-#ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED
-         /* Fix up the deflate header, if required */
-         optimize_cmf(comp->output, comp->input_len);
-#endif
-         /* But Z_OK is returned, not Z_STREAM_END; this allows the claim
-          * function above to return Z_STREAM_END on an error (though it never
-          * does in the current versions of zlib.)
-          */
-         return Z_OK;
-      }
-
-      else
-         return ret;
-   }
-}
-
-/* Ship the compressed text out via chunk writes */
-static void
-png_write_compressed_data_out(png_structrp png_ptr, compression_state *comp)
-{
-   png_uint_32 output_len = comp->output_len;
-   png_const_bytep output = comp->output;
-   png_uint_32 avail = (sizeof comp->output);
-   png_compression_buffer *next = png_ptr->zbuffer_list;
-
-   for (;;)
-   {
-      if (avail > output_len)
-         avail = output_len;
-
-      png_write_chunk_data(png_ptr, output, avail);
-
-      output_len -= avail;
-
-      if (output_len == 0 || next == NULL)
-         break;
-
-      avail = png_ptr->zbuffer_size;
-      output = next->output;
-      next = next->next;
-   }
-
-   /* This is an internal error; 'next' must have been NULL! */
-   if (output_len > 0)
-      png_error(png_ptr, "error writing ancillary chunked compressed data");
-}
-#endif /* WRITE_COMPRESSED_TEXT */
-
-/* Write the IHDR chunk, and update the png_struct with the necessary
- * information.  Note that the rest of this code depends upon this
- * information being correct.
- */
-void /* PRIVATE */
-png_write_IHDR(png_structrp png_ptr, png_uint_32 width, png_uint_32 height,
-    int bit_depth, int color_type, int compression_type, int filter_type,
-    int interlace_type)
-{
-   png_byte buf[13]; /* Buffer to store the IHDR info */
-   int is_invalid_depth;
-
-   png_debug(1, "in png_write_IHDR");
-
-   /* Check that we have valid input data from the application info */
-   switch (color_type)
-   {
-      case PNG_COLOR_TYPE_GRAY:
-         switch (bit_depth)
-         {
-            case 1:
-            case 2:
-            case 4:
-            case 8:
-#ifdef PNG_WRITE_16BIT_SUPPORTED
-            case 16:
-#endif
-               png_ptr->channels = 1; break;
-
-            default:
-               png_error(png_ptr,
-                   "Invalid bit depth for grayscale image");
-         }
-         break;
-
-      case PNG_COLOR_TYPE_RGB:
-         is_invalid_depth = (bit_depth != 8);
-#ifdef PNG_WRITE_16BIT_SUPPORTED
-         is_invalid_depth = (is_invalid_depth && bit_depth != 16);
-#endif
-         if (is_invalid_depth)
-            png_error(png_ptr, "Invalid bit depth for RGB image");
-
-         png_ptr->channels = 3;
-         break;
-
-      case PNG_COLOR_TYPE_PALETTE:
-         switch (bit_depth)
-         {
-            case 1:
-            case 2:
-            case 4:
-            case 8:
-               png_ptr->channels = 1;
-               break;
-
-            default:
-               png_error(png_ptr, "Invalid bit depth for paletted image");
-         }
-         break;
-
-      case PNG_COLOR_TYPE_GRAY_ALPHA:
-         is_invalid_depth = (bit_depth != 8);
-#ifdef PNG_WRITE_16BIT_SUPPORTED
-         is_invalid_depth = (is_invalid_depth && bit_depth != 16);
-#endif
-         if (is_invalid_depth)
-            png_error(png_ptr, "Invalid bit depth for grayscale+alpha image");
-
-         png_ptr->channels = 2;
-         break;
-
-      case PNG_COLOR_TYPE_RGB_ALPHA:
-         is_invalid_depth = (bit_depth != 8);
-#ifdef PNG_WRITE_16BIT_SUPPORTED
-         is_invalid_depth = (is_invalid_depth && bit_depth != 16);
-#endif
-         if (is_invalid_depth)
-            png_error(png_ptr, "Invalid bit depth for RGBA image");
-
-         png_ptr->channels = 4;
-         break;
-
-      default:
-         png_error(png_ptr, "Invalid image color type specified");
-   }
-
-   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
-   {
-      png_warning(png_ptr, "Invalid compression type specified");
-      compression_type = PNG_COMPRESSION_TYPE_BASE;
-   }
-
-   /* Write filter_method 64 (intrapixel differencing) only if
-    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
-    * 2. Libpng did not write a PNG signature (this filter_method is only
-    *    used in PNG datastreams that are embedded in MNG datastreams) and
-    * 3. The application called png_permit_mng_features with a mask that
-    *    included PNG_FLAG_MNG_FILTER_64 and
-    * 4. The filter_method is 64 and
-    * 5. The color_type is RGB or RGBA
-    */
-   if (
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-       !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) != 0 &&
-       ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) &&
-       (color_type == PNG_COLOR_TYPE_RGB ||
-        color_type == PNG_COLOR_TYPE_RGB_ALPHA) &&
-       (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) &&
-#endif
-       filter_type != PNG_FILTER_TYPE_BASE)
-   {
-      png_warning(png_ptr, "Invalid filter type specified");
-      filter_type = PNG_FILTER_TYPE_BASE;
-   }
-
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED
-   if (interlace_type != PNG_INTERLACE_NONE &&
-       interlace_type != PNG_INTERLACE_ADAM7)
-   {
-      png_warning(png_ptr, "Invalid interlace type specified");
-      interlace_type = PNG_INTERLACE_ADAM7;
-   }
-#else
-   interlace_type=PNG_INTERLACE_NONE;
-#endif
-
-   /* Save the relevant information */
-   png_ptr->bit_depth = (png_byte)bit_depth;
-   png_ptr->color_type = (png_byte)color_type;
-   png_ptr->interlaced = (png_byte)interlace_type;
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-   png_ptr->filter_type = (png_byte)filter_type;
-#endif
-   png_ptr->compression_type = (png_byte)compression_type;
-   png_ptr->width = width;
-   png_ptr->height = height;
-
-   png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels);
-   png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width);
-   /* Set the usr info, so any transformations can modify it */
-   png_ptr->usr_width = png_ptr->width;
-   png_ptr->usr_bit_depth = png_ptr->bit_depth;
-   png_ptr->usr_channels = png_ptr->channels;
-
-   /* Pack the header information into the buffer */
-   png_save_uint_32(buf, width);
-   png_save_uint_32(buf + 4, height);
-   buf[8] = (png_byte)bit_depth;
-   buf[9] = (png_byte)color_type;
-   buf[10] = (png_byte)compression_type;
-   buf[11] = (png_byte)filter_type;
-   buf[12] = (png_byte)interlace_type;
-
-   /* Write the chunk */
-   png_write_complete_chunk(png_ptr, png_IHDR, buf, (png_size_t)13);
-
-   if ((png_ptr->do_filter) == PNG_NO_FILTERS)
-   {
-      if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE ||
-          png_ptr->bit_depth < 8)
-         png_ptr->do_filter = PNG_FILTER_NONE;
-
-      else
-         png_ptr->do_filter = PNG_ALL_FILTERS;
-   }
-
-   png_ptr->mode = PNG_HAVE_IHDR; /* not READY_FOR_ZTXT */
-}
-
-/* Write the palette.  We are careful not to trust png_color to be in the
- * correct order for PNG, so people can redefine it to any convenient
- * structure.
- */
-void /* PRIVATE */
-png_write_PLTE(png_structrp png_ptr, png_const_colorp palette,
-    png_uint_32 num_pal)
-{
-   png_uint_32 max_palette_length, i;
-   png_const_colorp pal_ptr;
-   png_byte buf[3];
-
-   png_debug(1, "in png_write_PLTE");
-
-   max_palette_length = (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
-      (1 << png_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
-
-   if ((
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-       (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 &&
-#endif
-       num_pal == 0) || num_pal > max_palette_length)
-   {
-      if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      {
-         png_error(png_ptr, "Invalid number of colors in palette");
-      }
-
-      else
-      {
-         png_warning(png_ptr, "Invalid number of colors in palette");
-         return;
-      }
-   }
-
-   if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) == 0)
-   {
-      png_warning(png_ptr,
-          "Ignoring request to write a PLTE chunk in grayscale PNG");
-
-      return;
-   }
-
-   png_ptr->num_palette = (png_uint_16)num_pal;
-   png_debug1(3, "num_palette = %d", png_ptr->num_palette);
-
-   png_write_chunk_header(png_ptr, png_PLTE, (png_uint_32)(num_pal * 3));
-#ifdef PNG_POINTER_INDEXING_SUPPORTED
-
-   for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++)
-   {
-      buf[0] = pal_ptr->red;
-      buf[1] = pal_ptr->green;
-      buf[2] = pal_ptr->blue;
-      png_write_chunk_data(png_ptr, buf, (png_size_t)3);
-   }
-
-#else
-   /* This is a little slower but some buggy compilers need to do this
-    * instead
-    */
-   pal_ptr=palette;
-
-   for (i = 0; i < num_pal; i++)
-   {
-      buf[0] = pal_ptr[i].red;
-      buf[1] = pal_ptr[i].green;
-      buf[2] = pal_ptr[i].blue;
-      png_write_chunk_data(png_ptr, buf, (png_size_t)3);
-   }
-
-#endif
-   png_write_chunk_end(png_ptr);
-   png_ptr->mode |= PNG_HAVE_PLTE;
-}
-
-/* This is similar to png_text_compress, above, except that it does not require
- * all of the data at once and, instead of buffering the compressed result,
- * writes it as IDAT chunks.  Unlike png_text_compress it *can* png_error out
- * because it calls the write interface.  As a result it does its own error
- * reporting and does not return an error code.  In the event of error it will
- * just call png_error.  The input data length may exceed 32-bits.  The 'flush'
- * parameter is exactly the same as that to deflate, with the following
- * meanings:
- *
- * Z_NO_FLUSH: normal incremental output of compressed data
- * Z_SYNC_FLUSH: do a SYNC_FLUSH, used by png_write_flush
- * Z_FINISH: this is the end of the input, do a Z_FINISH and clean up
- *
- * The routine manages the acquire and release of the png_ptr->zstream by
- * checking and (at the end) clearing png_ptr->zowner; it does some sanity
- * checks on the 'mode' flags while doing this.
- */
-void /* PRIVATE */
-png_compress_IDAT(png_structrp png_ptr, png_const_bytep input,
-    png_alloc_size_t input_len, int flush)
-{
-   if (png_ptr->zowner != png_IDAT)
-   {
-      /* First time.   Ensure we have a temporary buffer for compression and
-       * trim the buffer list if it has more than one entry to free memory.
-       * If 'WRITE_COMPRESSED_TEXT' is not set the list will never have been
-       * created at this point, but the check here is quick and safe.
-       */
-      if (png_ptr->zbuffer_list == NULL)
-      {
-         png_ptr->zbuffer_list = png_voidcast(png_compression_bufferp,
-             png_malloc(png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr)));
-         png_ptr->zbuffer_list->next = NULL;
-      }
-
-      else
-         png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list->next);
-
-      /* It is a terminal error if we can't claim the zstream. */
-      if (png_deflate_claim(png_ptr, png_IDAT, png_image_size(png_ptr)) != Z_OK)
-         png_error(png_ptr, png_ptr->zstream.msg);
-
-      /* The output state is maintained in png_ptr->zstream, so it must be
-       * initialized here after the claim.
-       */
-      png_ptr->zstream.next_out = png_ptr->zbuffer_list->output;
-      png_ptr->zstream.avail_out = png_ptr->zbuffer_size;
-   }
-
-   /* Now loop reading and writing until all the input is consumed or an error
-    * terminates the operation.  The _out values are maintained across calls to
-    * this function, but the input must be reset each time.
-    */
-   png_ptr->zstream.next_in = PNGZ_INPUT_CAST(input);
-   png_ptr->zstream.avail_in = 0; /* set below */
-   for (;;)
-   {
-      int ret;
-
-      /* INPUT: from the row data */
-      uInt avail = ZLIB_IO_MAX;
-
-      if (avail > input_len)
-         avail = (uInt)input_len; /* safe because of the check */
-
-      png_ptr->zstream.avail_in = avail;
-      input_len -= avail;
-
-      ret = deflate(&png_ptr->zstream, input_len > 0 ? Z_NO_FLUSH : flush);
-
-      /* Include as-yet unconsumed input */
-      input_len += png_ptr->zstream.avail_in;
-      png_ptr->zstream.avail_in = 0;
-
-      /* OUTPUT: write complete IDAT chunks when avail_out drops to zero. Note
-       * that these two zstream fields are preserved across the calls, therefore
-       * there is no need to set these up on entry to the loop.
-       */
-      if (png_ptr->zstream.avail_out == 0)
-      {
-         png_bytep data = png_ptr->zbuffer_list->output;
-         uInt size = png_ptr->zbuffer_size;
-
-         /* Write an IDAT containing the data then reset the buffer.  The
-          * first IDAT may need deflate header optimization.
-          */
-#ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED
-            if ((png_ptr->mode & PNG_HAVE_IDAT) == 0 &&
-                png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE)
-               optimize_cmf(data, png_image_size(png_ptr));
-#endif
-
-         if (size > 0)
-            png_write_complete_chunk(png_ptr, png_IDAT, data, size);
-         png_ptr->mode |= PNG_HAVE_IDAT;
-
-         png_ptr->zstream.next_out = data;
-         png_ptr->zstream.avail_out = size;
-
-         /* For SYNC_FLUSH or FINISH it is essential to keep calling zlib with
-          * the same flush parameter until it has finished output, for NO_FLUSH
-          * it doesn't matter.
-          */
-         if (ret == Z_OK && flush != Z_NO_FLUSH)
-            continue;
-      }
-
-      /* The order of these checks doesn't matter much; it just affects which
-       * possible error might be detected if multiple things go wrong at once.
-       */
-      if (ret == Z_OK) /* most likely return code! */
-      {
-         /* If all the input has been consumed then just return.  If Z_FINISH
-          * was used as the flush parameter something has gone wrong if we get
-          * here.
-          */
-         if (input_len == 0)
-         {
-            if (flush == Z_FINISH)
-               png_error(png_ptr, "Z_OK on Z_FINISH with output space");
-
-            return;
-         }
-      }
-
-      else if (ret == Z_STREAM_END && flush == Z_FINISH)
-      {
-         /* This is the end of the IDAT data; any pending output must be
-          * flushed.  For small PNG files we may still be at the beginning.
-          */
-         png_bytep data = png_ptr->zbuffer_list->output;
-         uInt size = png_ptr->zbuffer_size - png_ptr->zstream.avail_out;
-
-#ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED
-         if ((png_ptr->mode & PNG_HAVE_IDAT) == 0 &&
-             png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE)
-            optimize_cmf(data, png_image_size(png_ptr));
-#endif
-
-         if (size > 0)
-            png_write_complete_chunk(png_ptr, png_IDAT, data, size);
-         png_ptr->zstream.avail_out = 0;
-         png_ptr->zstream.next_out = NULL;
-         png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT;
-
-         png_ptr->zowner = 0; /* Release the stream */
-         return;
-      }
-
-      else
-      {
-         /* This is an error condition. */
-         png_zstream_error(png_ptr, ret);
-         png_error(png_ptr, png_ptr->zstream.msg);
-      }
-   }
-}
-
-/* Write an IEND chunk */
-void /* PRIVATE */
-png_write_IEND(png_structrp png_ptr)
-{
-   png_debug(1, "in png_write_IEND");
-
-   png_write_complete_chunk(png_ptr, png_IEND, NULL, (png_size_t)0);
-   png_ptr->mode |= PNG_HAVE_IEND;
-}
-
-#ifdef PNG_WRITE_gAMA_SUPPORTED
-/* Write a gAMA chunk */
-void /* PRIVATE */
-png_write_gAMA_fixed(png_structrp png_ptr, png_fixed_point file_gamma)
-{
-   png_byte buf[4];
-
-   png_debug(1, "in png_write_gAMA");
-
-   /* file_gamma is saved in 1/100,000ths */
-   png_save_uint_32(buf, (png_uint_32)file_gamma);
-   png_write_complete_chunk(png_ptr, png_gAMA, buf, (png_size_t)4);
-}
-#endif
-
-#ifdef PNG_WRITE_sRGB_SUPPORTED
-/* Write a sRGB chunk */
-void /* PRIVATE */
-png_write_sRGB(png_structrp png_ptr, int srgb_intent)
-{
-   png_byte buf[1];
-
-   png_debug(1, "in png_write_sRGB");
-
-   if (srgb_intent >= PNG_sRGB_INTENT_LAST)
-      png_warning(png_ptr,
-          "Invalid sRGB rendering intent specified");
-
-   buf[0]=(png_byte)srgb_intent;
-   png_write_complete_chunk(png_ptr, png_sRGB, buf, (png_size_t)1);
-}
-#endif
-
-#ifdef PNG_WRITE_iCCP_SUPPORTED
-/* Write an iCCP chunk */
-void /* PRIVATE */
-png_write_iCCP(png_structrp png_ptr, png_const_charp name,
-    png_const_bytep profile)
-{
-   png_uint_32 name_len;
-   png_uint_32 profile_len;
-   png_byte new_name[81]; /* 1 byte for the compression byte */
-   compression_state comp;
-   png_uint_32 temp;
-
-   png_debug(1, "in png_write_iCCP");
-
-   /* These are all internal problems: the profile should have been checked
-    * before when it was stored.
-    */
-   if (profile == NULL)
-      png_error(png_ptr, "No profile for iCCP chunk"); /* internal error */
-
-   profile_len = png_get_uint_32(profile);
-
-   if (profile_len < 132)
-      png_error(png_ptr, "ICC profile too short");
-
-   temp = (png_uint_32) (*(profile+8));
-   if (temp > 3 && (profile_len & 0x03))
-      png_error(png_ptr, "ICC profile length invalid (not a multiple of 4)");
-
-   {
-      png_uint_32 embedded_profile_len = png_get_uint_32(profile);
-
-      if (profile_len != embedded_profile_len)
-         png_error(png_ptr, "Profile length does not match profile");
-   }
-
-   name_len = png_check_keyword(png_ptr, name, new_name);
-
-   if (name_len == 0)
-      png_error(png_ptr, "iCCP: invalid keyword");
-
-   new_name[++name_len] = PNG_COMPRESSION_TYPE_BASE;
-
-   /* Make sure we include the NULL after the name and the compression type */
-   ++name_len;
-
-   png_text_compress_init(&comp, profile, profile_len);
-
-   /* Allow for keyword terminator and compression byte */
-   if (png_text_compress(png_ptr, png_iCCP, &comp, name_len) != Z_OK)
-      png_error(png_ptr, png_ptr->zstream.msg);
-
-   png_write_chunk_header(png_ptr, png_iCCP, name_len + comp.output_len);
-
-   png_write_chunk_data(png_ptr, new_name, name_len);
-
-   png_write_compressed_data_out(png_ptr, &comp);
-
-   png_write_chunk_end(png_ptr);
-}
-#endif
-
-#ifdef PNG_WRITE_sPLT_SUPPORTED
-/* Write a sPLT chunk */
-void /* PRIVATE */
-png_write_sPLT(png_structrp png_ptr, png_const_sPLT_tp spalette)
-{
-   png_uint_32 name_len;
-   png_byte new_name[80];
-   png_byte entrybuf[10];
-   png_size_t entry_size = (spalette->depth == 8 ? 6 : 10);
-   png_size_t palette_size = entry_size * (png_size_t)spalette->nentries;
-   png_sPLT_entryp ep;
-#ifndef PNG_POINTER_INDEXING_SUPPORTED
-   int i;
-#endif
-
-   png_debug(1, "in png_write_sPLT");
-
-   name_len = png_check_keyword(png_ptr, spalette->name, new_name);
-
-   if (name_len == 0)
-      png_error(png_ptr, "sPLT: invalid keyword");
-
-   /* Make sure we include the NULL after the name */
-   png_write_chunk_header(png_ptr, png_sPLT,
-       (png_uint_32)(name_len + 2 + palette_size));
-
-   png_write_chunk_data(png_ptr, (png_bytep)new_name,
-       (png_size_t)(name_len + 1));
-
-   png_write_chunk_data(png_ptr, &spalette->depth, (png_size_t)1);
-
-   /* Loop through each palette entry, writing appropriately */
-#ifdef PNG_POINTER_INDEXING_SUPPORTED
-   for (ep = spalette->entries; ep<spalette->entries + spalette->nentries; ep++)
-   {
-      if (spalette->depth == 8)
-      {
-         entrybuf[0] = (png_byte)ep->red;
-         entrybuf[1] = (png_byte)ep->green;
-         entrybuf[2] = (png_byte)ep->blue;
-         entrybuf[3] = (png_byte)ep->alpha;
-         png_save_uint_16(entrybuf + 4, ep->frequency);
-      }
-
-      else
-      {
-         png_save_uint_16(entrybuf + 0, ep->red);
-         png_save_uint_16(entrybuf + 2, ep->green);
-         png_save_uint_16(entrybuf + 4, ep->blue);
-         png_save_uint_16(entrybuf + 6, ep->alpha);
-         png_save_uint_16(entrybuf + 8, ep->frequency);
-      }
-
-      png_write_chunk_data(png_ptr, entrybuf, entry_size);
-   }
-#else
-   ep=spalette->entries;
-   for (i = 0; i>spalette->nentries; i++)
-   {
-      if (spalette->depth == 8)
-      {
-         entrybuf[0] = (png_byte)ep[i].red;
-         entrybuf[1] = (png_byte)ep[i].green;
-         entrybuf[2] = (png_byte)ep[i].blue;
-         entrybuf[3] = (png_byte)ep[i].alpha;
-         png_save_uint_16(entrybuf + 4, ep[i].frequency);
-      }
-
-      else
-      {
-         png_save_uint_16(entrybuf + 0, ep[i].red);
-         png_save_uint_16(entrybuf + 2, ep[i].green);
-         png_save_uint_16(entrybuf + 4, ep[i].blue);
-         png_save_uint_16(entrybuf + 6, ep[i].alpha);
-         png_save_uint_16(entrybuf + 8, ep[i].frequency);
-      }
-
-      png_write_chunk_data(png_ptr, entrybuf, entry_size);
-   }
-#endif
-
-   png_write_chunk_end(png_ptr);
-}
-#endif
-
-#ifdef PNG_WRITE_sBIT_SUPPORTED
-/* Write the sBIT chunk */
-void /* PRIVATE */
-png_write_sBIT(png_structrp png_ptr, png_const_color_8p sbit, int color_type)
-{
-   png_byte buf[4];
-   png_size_t size;
-
-   png_debug(1, "in png_write_sBIT");
-
-   /* Make sure we don't depend upon the order of PNG_COLOR_8 */
-   if ((color_type & PNG_COLOR_MASK_COLOR) != 0)
-   {
-      png_byte maxbits;
-
-      maxbits = (png_byte)(color_type==PNG_COLOR_TYPE_PALETTE ? 8 :
-          png_ptr->usr_bit_depth);
-
-      if (sbit->red == 0 || sbit->red > maxbits ||
-          sbit->green == 0 || sbit->green > maxbits ||
-          sbit->blue == 0 || sbit->blue > maxbits)
-      {
-         png_warning(png_ptr, "Invalid sBIT depth specified");
-         return;
-      }
-
-      buf[0] = sbit->red;
-      buf[1] = sbit->green;
-      buf[2] = sbit->blue;
-      size = 3;
-   }
-
-   else
-   {
-      if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth)
-      {
-         png_warning(png_ptr, "Invalid sBIT depth specified");
-         return;
-      }
-
-      buf[0] = sbit->gray;
-      size = 1;
-   }
-
-   if ((color_type & PNG_COLOR_MASK_ALPHA) != 0)
-   {
-      if (sbit->alpha == 0 || sbit->alpha > png_ptr->usr_bit_depth)
-      {
-         png_warning(png_ptr, "Invalid sBIT depth specified");
-         return;
-      }
-
-      buf[size++] = sbit->alpha;
-   }
-
-   png_write_complete_chunk(png_ptr, png_sBIT, buf, size);
-}
-#endif
-
-#ifdef PNG_WRITE_cHRM_SUPPORTED
-/* Write the cHRM chunk */
-void /* PRIVATE */
-png_write_cHRM_fixed(png_structrp png_ptr, const png_xy *xy)
-{
-   png_byte buf[32];
-
-   png_debug(1, "in png_write_cHRM");
-
-   /* Each value is saved in 1/100,000ths */
-   png_save_int_32(buf,      xy->whitex);
-   png_save_int_32(buf +  4, xy->whitey);
-
-   png_save_int_32(buf +  8, xy->redx);
-   png_save_int_32(buf + 12, xy->redy);
-
-   png_save_int_32(buf + 16, xy->greenx);
-   png_save_int_32(buf + 20, xy->greeny);
-
-   png_save_int_32(buf + 24, xy->bluex);
-   png_save_int_32(buf + 28, xy->bluey);
-
-   png_write_complete_chunk(png_ptr, png_cHRM, buf, 32);
-}
-#endif
-
-#ifdef PNG_WRITE_tRNS_SUPPORTED
-/* Write the tRNS chunk */
-void /* PRIVATE */
-png_write_tRNS(png_structrp png_ptr, png_const_bytep trans_alpha,
-    png_const_color_16p tran, int num_trans, int color_type)
-{
-   png_byte buf[6];
-
-   png_debug(1, "in png_write_tRNS");
-
-   if (color_type == PNG_COLOR_TYPE_PALETTE)
-   {
-      if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette)
-      {
-         png_app_warning(png_ptr,
-             "Invalid number of transparent colors specified");
-         return;
-      }
-
-      /* Write the chunk out as it is */
-      png_write_complete_chunk(png_ptr, png_tRNS, trans_alpha,
-          (png_size_t)num_trans);
-   }
-
-   else if (color_type == PNG_COLOR_TYPE_GRAY)
-   {
-      /* One 16-bit value */
-      if (tran->gray >= (1 << png_ptr->bit_depth))
-      {
-         png_app_warning(png_ptr,
-             "Ignoring attempt to write tRNS chunk out-of-range for bit_depth");
-
-         return;
-      }
-
-      png_save_uint_16(buf, tran->gray);
-      png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)2);
-   }
-
-   else if (color_type == PNG_COLOR_TYPE_RGB)
-   {
-      /* Three 16-bit values */
-      png_save_uint_16(buf, tran->red);
-      png_save_uint_16(buf + 2, tran->green);
-      png_save_uint_16(buf + 4, tran->blue);
-#ifdef PNG_WRITE_16BIT_SUPPORTED
-      if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]) != 0)
-#else
-      if ((buf[0] | buf[2] | buf[4]) != 0)
-#endif
-      {
-         png_app_warning(png_ptr,
-             "Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8");
-         return;
-      }
-
-      png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)6);
-   }
-
-   else
-   {
-      png_app_warning(png_ptr, "Can't write tRNS with an alpha channel");
-   }
-}
-#endif
-
-#ifdef PNG_WRITE_bKGD_SUPPORTED
-/* Write the background chunk */
-void /* PRIVATE */
-png_write_bKGD(png_structrp png_ptr, png_const_color_16p back, int color_type)
-{
-   png_byte buf[6];
-
-   png_debug(1, "in png_write_bKGD");
-
-   if (color_type == PNG_COLOR_TYPE_PALETTE)
-   {
-      if (
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-          (png_ptr->num_palette != 0 ||
-          (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0) &&
-#endif
-         back->index >= png_ptr->num_palette)
-      {
-         png_warning(png_ptr, "Invalid background palette index");
-         return;
-      }
-
-      buf[0] = back->index;
-      png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)1);
-   }
-
-   else if ((color_type & PNG_COLOR_MASK_COLOR) != 0)
-   {
-      png_save_uint_16(buf, back->red);
-      png_save_uint_16(buf + 2, back->green);
-      png_save_uint_16(buf + 4, back->blue);
-#ifdef PNG_WRITE_16BIT_SUPPORTED
-      if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]) != 0)
-#else
-      if ((buf[0] | buf[2] | buf[4]) != 0)
-#endif
-      {
-         png_warning(png_ptr,
-             "Ignoring attempt to write 16-bit bKGD chunk "
-             "when bit_depth is 8");
-
-         return;
-      }
-
-      png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)6);
-   }
-
-   else
-   {
-      if (back->gray >= (1 << png_ptr->bit_depth))
-      {
-         png_warning(png_ptr,
-             "Ignoring attempt to write bKGD chunk out-of-range for bit_depth");
-
-         return;
-      }
-
-      png_save_uint_16(buf, back->gray);
-      png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)2);
-   }
-}
-#endif
-
-#ifdef PNG_WRITE_eXIf_SUPPORTED
-/* Write the Exif data */
-void /* PRIVATE */
-png_write_eXIf(png_structrp png_ptr, png_bytep exif, int num_exif)
-{
-   int i;
-   png_byte buf[1];
-
-   png_debug(1, "in png_write_eXIf");
-
-   png_write_chunk_header(png_ptr, png_eXIf, (png_uint_32)(num_exif));
-
-   for (i = 0; i < num_exif; i++)
-   {
-      buf[0] = exif[i];
-      png_write_chunk_data(png_ptr, buf, (png_size_t)1);
-   }
-
-   png_write_chunk_end(png_ptr);
-}
-#endif
-
-#ifdef PNG_WRITE_hIST_SUPPORTED
-/* Write the histogram */
-void /* PRIVATE */
-png_write_hIST(png_structrp png_ptr, png_const_uint_16p hist, int num_hist)
-{
-   int i;
-   png_byte buf[3];
-
-   png_debug(1, "in png_write_hIST");
-
-   if (num_hist > (int)png_ptr->num_palette)
-   {
-      png_debug2(3, "num_hist = %d, num_palette = %d", num_hist,
-          png_ptr->num_palette);
-
-      png_warning(png_ptr, "Invalid number of histogram entries specified");
-      return;
-   }
-
-   png_write_chunk_header(png_ptr, png_hIST, (png_uint_32)(num_hist * 2));
-
-   for (i = 0; i < num_hist; i++)
-   {
-      png_save_uint_16(buf, hist[i]);
-      png_write_chunk_data(png_ptr, buf, (png_size_t)2);
-   }
-
-   png_write_chunk_end(png_ptr);
-}
-#endif
-
-#ifdef PNG_WRITE_tEXt_SUPPORTED
-/* Write a tEXt chunk */
-void /* PRIVATE */
-png_write_tEXt(png_structrp png_ptr, png_const_charp key, png_const_charp text,
-    png_size_t text_len)
-{
-   png_uint_32 key_len;
-   png_byte new_key[80];
-
-   png_debug(1, "in png_write_tEXt");
-
-   key_len = png_check_keyword(png_ptr, key, new_key);
-
-   if (key_len == 0)
-      png_error(png_ptr, "tEXt: invalid keyword");
-
-   if (text == NULL || *text == '\0')
-      text_len = 0;
-
-   else
-      text_len = strlen(text);
-
-   if (text_len > PNG_UINT_31_MAX - (key_len+1))
-      png_error(png_ptr, "tEXt: text too long");
-
-   /* Make sure we include the 0 after the key */
-   png_write_chunk_header(png_ptr, png_tEXt,
-       (png_uint_32)/*checked above*/(key_len + text_len + 1));
-   /*
-    * We leave it to the application to meet PNG-1.0 requirements on the
-    * contents of the text.  PNG-1.0 through PNG-1.2 discourage the use of
-    * any non-Latin-1 characters except for NEWLINE.  ISO PNG will forbid them.
-    * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.
-    */
-   png_write_chunk_data(png_ptr, new_key, key_len + 1);
-
-   if (text_len != 0)
-      png_write_chunk_data(png_ptr, (png_const_bytep)text, text_len);
-
-   png_write_chunk_end(png_ptr);
-}
-#endif
-
-#ifdef PNG_WRITE_zTXt_SUPPORTED
-/* Write a compressed text chunk */
-void /* PRIVATE */
-png_write_zTXt(png_structrp png_ptr, png_const_charp key, png_const_charp text,
-    int compression)
-{
-   png_uint_32 key_len;
-   png_byte new_key[81];
-   compression_state comp;
-
-   png_debug(1, "in png_write_zTXt");
-
-   if (compression == PNG_TEXT_COMPRESSION_NONE)
-   {
-      png_write_tEXt(png_ptr, key, text, 0);
-      return;
-   }
-
-   if (compression != PNG_TEXT_COMPRESSION_zTXt)
-      png_error(png_ptr, "zTXt: invalid compression type");
-
-   key_len = png_check_keyword(png_ptr, key, new_key);
-
-   if (key_len == 0)
-      png_error(png_ptr, "zTXt: invalid keyword");
-
-   /* Add the compression method and 1 for the keyword separator. */
-   new_key[++key_len] = PNG_COMPRESSION_TYPE_BASE;
-   ++key_len;
-
-   /* Compute the compressed data; do it now for the length */
-   png_text_compress_init(&comp, (png_const_bytep)text,
-       text == NULL ? 0 : strlen(text));
-
-   if (png_text_compress(png_ptr, png_zTXt, &comp, key_len) != Z_OK)
-      png_error(png_ptr, png_ptr->zstream.msg);
-
-   /* Write start of chunk */
-   png_write_chunk_header(png_ptr, png_zTXt, key_len + comp.output_len);
-
-   /* Write key */
-   png_write_chunk_data(png_ptr, new_key, key_len);
-
-   /* Write the compressed data */
-   png_write_compressed_data_out(png_ptr, &comp);
-
-   /* Close the chunk */
-   png_write_chunk_end(png_ptr);
-}
-#endif
-
-#ifdef PNG_WRITE_iTXt_SUPPORTED
-/* Write an iTXt chunk */
-void /* PRIVATE */
-png_write_iTXt(png_structrp png_ptr, int compression, png_const_charp key,
-    png_const_charp lang, png_const_charp lang_key, png_const_charp text)
-{
-   png_uint_32 key_len, prefix_len;
-   png_size_t lang_len, lang_key_len;
-   png_byte new_key[82];
-   compression_state comp;
-
-   png_debug(1, "in png_write_iTXt");
-
-   key_len = png_check_keyword(png_ptr, key, new_key);
-
-   if (key_len == 0)
-      png_error(png_ptr, "iTXt: invalid keyword");
-
-   /* Set the compression flag */
-   switch (compression)
-   {
-      case PNG_ITXT_COMPRESSION_NONE:
-      case PNG_TEXT_COMPRESSION_NONE:
-         compression = new_key[++key_len] = 0; /* no compression */
-         break;
-
-      case PNG_TEXT_COMPRESSION_zTXt:
-      case PNG_ITXT_COMPRESSION_zTXt:
-         compression = new_key[++key_len] = 1; /* compressed */
-         break;
-
-      default:
-         png_error(png_ptr, "iTXt: invalid compression");
-   }
-
-   new_key[++key_len] = PNG_COMPRESSION_TYPE_BASE;
-   ++key_len; /* for the keywod separator */
-
-   /* We leave it to the application to meet PNG-1.0 requirements on the
-    * contents of the text.  PNG-1.0 through PNG-1.2 discourage the use of
-    * any non-Latin-1 characters except for NEWLINE.  ISO PNG, however,
-    * specifies that the text is UTF-8 and this really doesn't require any
-    * checking.
-    *
-    * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.
-    *
-    * TODO: validate the language tag correctly (see the spec.)
-    */
-   if (lang == NULL) lang = ""; /* empty language is valid */
-   lang_len = strlen(lang)+1;
-   if (lang_key == NULL) lang_key = ""; /* may be empty */
-   lang_key_len = strlen(lang_key)+1;
-   if (text == NULL) text = ""; /* may be empty */
-
-   prefix_len = key_len;
-   if (lang_len > PNG_UINT_31_MAX-prefix_len)
-      prefix_len = PNG_UINT_31_MAX;
-   else
-      prefix_len = (png_uint_32)(prefix_len + lang_len);
-
-   if (lang_key_len > PNG_UINT_31_MAX-prefix_len)
-      prefix_len = PNG_UINT_31_MAX;
-   else
-      prefix_len = (png_uint_32)(prefix_len + lang_key_len);
-
-   png_text_compress_init(&comp, (png_const_bytep)text, strlen(text));
-
-   if (compression != 0)
-   {
-      if (png_text_compress(png_ptr, png_iTXt, &comp, prefix_len) != Z_OK)
-         png_error(png_ptr, png_ptr->zstream.msg);
-   }
-
-   else
-   {
-      if (comp.input_len > PNG_UINT_31_MAX-prefix_len)
-         png_error(png_ptr, "iTXt: uncompressed text too long");
-
-      /* So the string will fit in a chunk: */
-      comp.output_len = (png_uint_32)/*SAFE*/comp.input_len;
-   }
-
-   png_write_chunk_header(png_ptr, png_iTXt, comp.output_len + prefix_len);
-
-   png_write_chunk_data(png_ptr, new_key, key_len);
-
-   png_write_chunk_data(png_ptr, (png_const_bytep)lang, lang_len);
-
-   png_write_chunk_data(png_ptr, (png_const_bytep)lang_key, lang_key_len);
-
-   if (compression != 0)
-      png_write_compressed_data_out(png_ptr, &comp);
-
-   else
-      png_write_chunk_data(png_ptr, (png_const_bytep)text, comp.output_len);
-
-   png_write_chunk_end(png_ptr);
-}
-#endif
-
-#ifdef PNG_WRITE_oFFs_SUPPORTED
-/* Write the oFFs chunk */
-void /* PRIVATE */
-png_write_oFFs(png_structrp png_ptr, png_int_32 x_offset, png_int_32 y_offset,
-    int unit_type)
-{
-   png_byte buf[9];
-
-   png_debug(1, "in png_write_oFFs");
-
-   if (unit_type >= PNG_OFFSET_LAST)
-      png_warning(png_ptr, "Unrecognized unit type for oFFs chunk");
-
-   png_save_int_32(buf, x_offset);
-   png_save_int_32(buf + 4, y_offset);
-   buf[8] = (png_byte)unit_type;
-
-   png_write_complete_chunk(png_ptr, png_oFFs, buf, (png_size_t)9);
-}
-#endif
-#ifdef PNG_WRITE_pCAL_SUPPORTED
-/* Write the pCAL chunk (described in the PNG extensions document) */
-void /* PRIVATE */
-png_write_pCAL(png_structrp png_ptr, png_charp purpose, png_int_32 X0,
-    png_int_32 X1, int type, int nparams, png_const_charp units,
-    png_charpp params)
-{
-   png_uint_32 purpose_len;
-   png_size_t units_len, total_len;
-   png_size_tp params_len;
-   png_byte buf[10];
-   png_byte new_purpose[80];
-   int i;
-
-   png_debug1(1, "in png_write_pCAL (%d parameters)", nparams);
-
-   if (type >= PNG_EQUATION_LAST)
-      png_error(png_ptr, "Unrecognized equation type for pCAL chunk");
-
-   purpose_len = png_check_keyword(png_ptr, purpose, new_purpose);
-
-   if (purpose_len == 0)
-      png_error(png_ptr, "pCAL: invalid keyword");
-
-   ++purpose_len; /* terminator */
-
-   png_debug1(3, "pCAL purpose length = %d", (int)purpose_len);
-   units_len = strlen(units) + (nparams == 0 ? 0 : 1);
-   png_debug1(3, "pCAL units length = %d", (int)units_len);
-   total_len = purpose_len + units_len + 10;
-
-   params_len = (png_size_tp)png_malloc(png_ptr,
-       (png_alloc_size_t)((png_alloc_size_t)nparams * (sizeof (png_size_t))));
-
-   /* Find the length of each parameter, making sure we don't count the
-    * null terminator for the last parameter.
-    */
-   for (i = 0; i < nparams; i++)
-   {
-      params_len[i] = strlen(params[i]) + (i == nparams - 1 ? 0 : 1);
-      png_debug2(3, "pCAL parameter %d length = %lu", i,
-          (unsigned long)params_len[i]);
-      total_len += params_len[i];
-   }
-
-   png_debug1(3, "pCAL total length = %d", (int)total_len);
-   png_write_chunk_header(png_ptr, png_pCAL, (png_uint_32)total_len);
-   png_write_chunk_data(png_ptr, new_purpose, purpose_len);
-   png_save_int_32(buf, X0);
-   png_save_int_32(buf + 4, X1);
-   buf[8] = (png_byte)type;
-   buf[9] = (png_byte)nparams;
-   png_write_chunk_data(png_ptr, buf, (png_size_t)10);
-   png_write_chunk_data(png_ptr, (png_const_bytep)units, (png_size_t)units_len);
-
-   for (i = 0; i < nparams; i++)
-   {
-      png_write_chunk_data(png_ptr, (png_const_bytep)params[i], params_len[i]);
-   }
-
-   png_free(png_ptr, params_len);
-   png_write_chunk_end(png_ptr);
-}
-#endif
-
-#ifdef PNG_WRITE_sCAL_SUPPORTED
-/* Write the sCAL chunk */
-void /* PRIVATE */
-png_write_sCAL_s(png_structrp png_ptr, int unit, png_const_charp width,
-    png_const_charp height)
-{
-   png_byte buf[64];
-   png_size_t wlen, hlen, total_len;
-
-   png_debug(1, "in png_write_sCAL_s");
-
-   wlen = strlen(width);
-   hlen = strlen(height);
-   total_len = wlen + hlen + 2;
-
-   if (total_len > 64)
-   {
-      png_warning(png_ptr, "Can't write sCAL (buffer too small)");
-      return;
-   }
-
-   buf[0] = (png_byte)unit;
-   memcpy(buf + 1, width, wlen + 1);      /* Append the '\0' here */
-   memcpy(buf + wlen + 2, height, hlen);  /* Do NOT append the '\0' here */
-
-   png_debug1(3, "sCAL total length = %u", (unsigned int)total_len);
-   png_write_complete_chunk(png_ptr, png_sCAL, buf, total_len);
-}
-#endif
-
-#ifdef PNG_WRITE_pHYs_SUPPORTED
-/* Write the pHYs chunk */
-void /* PRIVATE */
-png_write_pHYs(png_structrp png_ptr, png_uint_32 x_pixels_per_unit,
-    png_uint_32 y_pixels_per_unit,
-    int unit_type)
-{
-   png_byte buf[9];
-
-   png_debug(1, "in png_write_pHYs");
-
-   if (unit_type >= PNG_RESOLUTION_LAST)
-      png_warning(png_ptr, "Unrecognized unit type for pHYs chunk");
-
-   png_save_uint_32(buf, x_pixels_per_unit);
-   png_save_uint_32(buf + 4, y_pixels_per_unit);
-   buf[8] = (png_byte)unit_type;
-
-   png_write_complete_chunk(png_ptr, png_pHYs, buf, (png_size_t)9);
-}
-#endif
-
-#ifdef PNG_WRITE_tIME_SUPPORTED
-/* Write the tIME chunk.  Use either png_convert_from_struct_tm()
- * or png_convert_from_time_t(), or fill in the structure yourself.
- */
-void /* PRIVATE */
-png_write_tIME(png_structrp png_ptr, png_const_timep mod_time)
-{
-   png_byte buf[7];
-
-   png_debug(1, "in png_write_tIME");
-
-   if (mod_time->month  > 12 || mod_time->month  < 1 ||
-       mod_time->day    > 31 || mod_time->day    < 1 ||
-       mod_time->hour   > 23 || mod_time->second > 60)
-   {
-      png_warning(png_ptr, "Invalid time specified for tIME chunk");
-      return;
-   }
-
-   png_save_uint_16(buf, mod_time->year);
-   buf[2] = mod_time->month;
-   buf[3] = mod_time->day;
-   buf[4] = mod_time->hour;
-   buf[5] = mod_time->minute;
-   buf[6] = mod_time->second;
-
-   png_write_complete_chunk(png_ptr, png_tIME, buf, (png_size_t)7);
-}
-#endif
-
-/* Initializes the row writing capability of libpng */
-void /* PRIVATE */
-png_write_start_row(png_structrp png_ptr)
-{
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED
-   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
-
-   /* Start of interlace block */
-   static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
-
-   /* Offset to next interlace block */
-   static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
-
-   /* Start of interlace block in the y direction */
-   static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
-
-   /* Offset to next interlace block in the y direction */
-   static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
-#endif
-
-   png_alloc_size_t buf_size;
-   int usr_pixel_depth;
-
-#ifdef PNG_WRITE_FILTER_SUPPORTED
-   png_byte filters;
-#endif
-
-   png_debug(1, "in png_write_start_row");
-
-   usr_pixel_depth = png_ptr->usr_channels * png_ptr->usr_bit_depth;
-   buf_size = PNG_ROWBYTES(usr_pixel_depth, png_ptr->width) + 1;
-
-   /* 1.5.6: added to allow checking in the row write code. */
-   png_ptr->transformed_pixel_depth = png_ptr->pixel_depth;
-   png_ptr->maximum_pixel_depth = (png_byte)usr_pixel_depth;
-
-   /* Set up row buffer */
-   png_ptr->row_buf = png_voidcast(png_bytep, png_malloc(png_ptr, buf_size));
-
-   png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE;
-
-#ifdef PNG_WRITE_FILTER_SUPPORTED
-   filters = png_ptr->do_filter;
-
-   if (png_ptr->height == 1)
-      filters &= 0xff & ~(PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH);
-
-   if (png_ptr->width == 1)
-      filters &= 0xff & ~(PNG_FILTER_SUB|PNG_FILTER_AVG|PNG_FILTER_PAETH);
-
-   if (filters == 0)
-      filters = PNG_FILTER_NONE;
-
-   png_ptr->do_filter = filters;
-
-   if (((filters & (PNG_FILTER_SUB | PNG_FILTER_UP | PNG_FILTER_AVG |
-       PNG_FILTER_PAETH)) != 0) && png_ptr->try_row == NULL)
-   {
-      int num_filters = 0;
-
-      png_ptr->try_row = png_voidcast(png_bytep, png_malloc(png_ptr, buf_size));
-
-      if (filters & PNG_FILTER_SUB)
-         num_filters++;
-
-      if (filters & PNG_FILTER_UP)
-         num_filters++;
-
-      if (filters & PNG_FILTER_AVG)
-         num_filters++;
-
-      if (filters & PNG_FILTER_PAETH)
-         num_filters++;
-
-      if (num_filters > 1)
-         png_ptr->tst_row = png_voidcast(png_bytep, png_malloc(png_ptr,
-             buf_size));
-   }
-
-   /* We only need to keep the previous row if we are using one of the following
-    * filters.
-    */
-   if ((filters & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH)) != 0)
-      png_ptr->prev_row = png_voidcast(png_bytep,
-          png_calloc(png_ptr, buf_size));
-#endif /* WRITE_FILTER */
-
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED
-   /* If interlaced, we need to set up width and height of pass */
-   if (png_ptr->interlaced != 0)
-   {
-      if ((png_ptr->transformations & PNG_INTERLACE) == 0)
-      {
-         png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -
-             png_pass_ystart[0]) / png_pass_yinc[0];
-
-         png_ptr->usr_width = (png_ptr->width + png_pass_inc[0] - 1 -
-             png_pass_start[0]) / png_pass_inc[0];
-      }
-
-      else
-      {
-         png_ptr->num_rows = png_ptr->height;
-         png_ptr->usr_width = png_ptr->width;
-      }
-   }
-
-   else
-#endif
-   {
-      png_ptr->num_rows = png_ptr->height;
-      png_ptr->usr_width = png_ptr->width;
-   }
-}
-
-/* Internal use only.  Called when finished processing a row of data. */
-void /* PRIVATE */
-png_write_finish_row(png_structrp png_ptr)
-{
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED
-   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
-
-   /* Start of interlace block */
-   static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
-
-   /* Offset to next interlace block */
-   static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
-
-   /* Start of interlace block in the y direction */
-   static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
-
-   /* Offset to next interlace block in the y direction */
-   static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
-#endif
-
-   png_debug(1, "in png_write_finish_row");
-
-   /* Next row */
-   png_ptr->row_number++;
-
-   /* See if we are done */
-   if (png_ptr->row_number < png_ptr->num_rows)
-      return;
-
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED
-   /* If interlaced, go to next pass */
-   if (png_ptr->interlaced != 0)
-   {
-      png_ptr->row_number = 0;
-      if ((png_ptr->transformations & PNG_INTERLACE) != 0)
-      {
-         png_ptr->pass++;
-      }
-
-      else
-      {
-         /* Loop until we find a non-zero width or height pass */
-         do
-         {
-            png_ptr->pass++;
-
-            if (png_ptr->pass >= 7)
-               break;
-
-            png_ptr->usr_width = (png_ptr->width +
-                png_pass_inc[png_ptr->pass] - 1 -
-                png_pass_start[png_ptr->pass]) /
-                png_pass_inc[png_ptr->pass];
-
-            png_ptr->num_rows = (png_ptr->height +
-                png_pass_yinc[png_ptr->pass] - 1 -
-                png_pass_ystart[png_ptr->pass]) /
-                png_pass_yinc[png_ptr->pass];
-
-            if ((png_ptr->transformations & PNG_INTERLACE) != 0)
-               break;
-
-         } while (png_ptr->usr_width == 0 || png_ptr->num_rows == 0);
-
-      }
-
-      /* Reset the row above the image for the next pass */
-      if (png_ptr->pass < 7)
-      {
-         if (png_ptr->prev_row != NULL)
-            memset(png_ptr->prev_row, 0,
-                (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels*
-                png_ptr->usr_bit_depth, png_ptr->width)) + 1);
-
-         return;
-      }
-   }
-#endif
-
-   /* If we get here, we've just written the last row, so we need
-      to flush the compressor */
-   png_compress_IDAT(png_ptr, NULL, 0, Z_FINISH);
-}
-
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED
-/* Pick out the correct pixels for the interlace pass.
- * The basic idea here is to go through the row with a source
- * pointer and a destination pointer (sp and dp), and copy the
- * correct pixels for the pass.  As the row gets compacted,
- * sp will always be >= dp, so we should never overwrite anything.
- * See the default: case for the easiest code to understand.
- */
-void /* PRIVATE */
-png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
-{
-   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
-
-   /* Start of interlace block */
-   static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
-
-   /* Offset to next interlace block */
-   static PNG_CONST png_byte  png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
-
-   png_debug(1, "in png_do_write_interlace");
-
-   /* We don't have to do anything on the last pass (6) */
-   if (pass < 6)
-   {
-      /* Each pixel depth is handled separately */
-      switch (row_info->pixel_depth)
-      {
-         case 1:
-         {
-            png_bytep sp;
-            png_bytep dp;
-            unsigned int shift;
-            int d;
-            int value;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            dp = row;
-            d = 0;
-            shift = 7;
-
-            for (i = png_pass_start[pass]; i < row_width;
-               i += png_pass_inc[pass])
-            {
-               sp = row + (png_size_t)(i >> 3);
-               value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01;
-               d |= (value << shift);
-
-               if (shift == 0)
-               {
-                  shift = 7;
-                  *dp++ = (png_byte)d;
-                  d = 0;
-               }
-
-               else
-                  shift--;
-
-            }
-            if (shift != 7)
-               *dp = (png_byte)d;
-
-            break;
-         }
-
-         case 2:
-         {
-            png_bytep sp;
-            png_bytep dp;
-            unsigned int shift;
-            int d;
-            int value;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            dp = row;
-            shift = 6;
-            d = 0;
-
-            for (i = png_pass_start[pass]; i < row_width;
-               i += png_pass_inc[pass])
-            {
-               sp = row + (png_size_t)(i >> 2);
-               value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03;
-               d |= (value << shift);
-
-               if (shift == 0)
-               {
-                  shift = 6;
-                  *dp++ = (png_byte)d;
-                  d = 0;
-               }
-
-               else
-                  shift -= 2;
-            }
-            if (shift != 6)
-               *dp = (png_byte)d;
-
-            break;
-         }
-
-         case 4:
-         {
-            png_bytep sp;
-            png_bytep dp;
-            unsigned int shift;
-            int d;
-            int value;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-
-            dp = row;
-            shift = 4;
-            d = 0;
-            for (i = png_pass_start[pass]; i < row_width;
-                i += png_pass_inc[pass])
-            {
-               sp = row + (png_size_t)(i >> 1);
-               value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f;
-               d |= (value << shift);
-
-               if (shift == 0)
-               {
-                  shift = 4;
-                  *dp++ = (png_byte)d;
-                  d = 0;
-               }
-
-               else
-                  shift -= 4;
-            }
-            if (shift != 4)
-               *dp = (png_byte)d;
-
-            break;
-         }
-
-         default:
-         {
-            png_bytep sp;
-            png_bytep dp;
-            png_uint_32 i;
-            png_uint_32 row_width = row_info->width;
-            png_size_t pixel_bytes;
-
-            /* Start at the beginning */
-            dp = row;
-
-            /* Find out how many bytes each pixel takes up */
-            pixel_bytes = (row_info->pixel_depth >> 3);
-
-            /* Loop through the row, only looking at the pixels that matter */
-            for (i = png_pass_start[pass]; i < row_width;
-               i += png_pass_inc[pass])
-            {
-               /* Find out where the original pixel is */
-               sp = row + (png_size_t)i * pixel_bytes;
-
-               /* Move the pixel */
-               if (dp != sp)
-                  memcpy(dp, sp, pixel_bytes);
-
-               /* Next pixel */
-               dp += pixel_bytes;
-            }
-            break;
-         }
-      }
-      /* Set new row width */
-      row_info->width = (row_info->width +
-          png_pass_inc[pass] - 1 -
-          png_pass_start[pass]) /
-          png_pass_inc[pass];
-
-      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
-          row_info->width);
-   }
-}
-#endif
-
-
-/* This filters the row, chooses which filter to use, if it has not already
- * been specified by the application, and then writes the row out with the
- * chosen filter.
- */
-static void /* PRIVATE */
-png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row,
-    png_size_t row_bytes);
-
-#ifdef PNG_WRITE_FILTER_SUPPORTED
-static png_size_t /* PRIVATE */
-png_setup_sub_row(png_structrp png_ptr, const png_uint_32 bpp,
-    const png_size_t row_bytes, const png_size_t lmins)
-{
-   png_bytep rp, dp, lp;
-   png_size_t i;
-   png_size_t sum = 0;
-   unsigned int v;
-
-   png_ptr->try_row[0] = PNG_FILTER_VALUE_SUB;
-
-   for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1; i < bpp;
-        i++, rp++, dp++)
-   {
-      v = *dp = *rp;
-#ifdef PNG_USE_ABS
-      sum += 128 - abs((int)v - 128);
-#else
-      sum += (v < 128) ? v : 256 - v;
-#endif
-   }
-
-   for (lp = png_ptr->row_buf + 1; i < row_bytes;
-      i++, rp++, lp++, dp++)
-   {
-      v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
-#ifdef PNG_USE_ABS
-      sum += 128 - abs((int)v - 128);
-#else
-      sum += (v < 128) ? v : 256 - v;
-#endif
-
-      if (sum > lmins)  /* We are already worse, don't continue. */
-        break;
-   }
-
-   return (sum);
-}
-
-static void /* PRIVATE */
-png_setup_sub_row_only(png_structrp png_ptr, const png_uint_32 bpp,
-    const png_size_t row_bytes)
-{
-   png_bytep rp, dp, lp;
-   png_size_t i;
-
-   png_ptr->try_row[0] = PNG_FILTER_VALUE_SUB;
-
-   for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1; i < bpp;
-        i++, rp++, dp++)
-   {
-      *dp = *rp;
-   }
-
-   for (lp = png_ptr->row_buf + 1; i < row_bytes;
-      i++, rp++, lp++, dp++)
-   {
-      *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
-   }
-}
-
-static png_size_t /* PRIVATE */
-png_setup_up_row(png_structrp png_ptr, const png_size_t row_bytes,
-    const png_size_t lmins)
-{
-   png_bytep rp, dp, pp;
-   png_size_t i;
-   png_size_t sum = 0;
-   unsigned int v;
-
-   png_ptr->try_row[0] = PNG_FILTER_VALUE_UP;
-
-   for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1,
-       pp = png_ptr->prev_row + 1; i < row_bytes;
-       i++, rp++, pp++, dp++)
-   {
-      v = *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
-#ifdef PNG_USE_ABS
-      sum += 128 - abs((int)v - 128);
-#else
-      sum += (v < 128) ? v : 256 - v;
-#endif
-
-      if (sum > lmins)  /* We are already worse, don't continue. */
-        break;
-   }
-
-   return (sum);
-}
-static void /* PRIVATE */
-png_setup_up_row_only(png_structrp png_ptr, const png_size_t row_bytes)
-{
-   png_bytep rp, dp, pp;
-   png_size_t i;
-
-   png_ptr->try_row[0] = PNG_FILTER_VALUE_UP;
-
-   for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1,
-       pp = png_ptr->prev_row + 1; i < row_bytes;
-       i++, rp++, pp++, dp++)
-   {
-      *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
-   }
-}
-
-static png_size_t /* PRIVATE */
-png_setup_avg_row(png_structrp png_ptr, const png_uint_32 bpp,
-    const png_size_t row_bytes, const png_size_t lmins)
-{
-   png_bytep rp, dp, pp, lp;
-   png_uint_32 i;
-   png_size_t sum = 0;
-   unsigned int v;
-
-   png_ptr->try_row[0] = PNG_FILTER_VALUE_AVG;
-
-   for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1,
-       pp = png_ptr->prev_row + 1; i < bpp; i++)
-   {
-      v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
-
-#ifdef PNG_USE_ABS
-      sum += 128 - abs((int)v - 128);
-#else
-      sum += (v < 128) ? v : 256 - v;
-#endif
-   }
-
-   for (lp = png_ptr->row_buf + 1; i < row_bytes; i++)
-   {
-      v = *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2))
-          & 0xff);
-
-#ifdef PNG_USE_ABS
-      sum += 128 - abs((int)v - 128);
-#else
-      sum += (v < 128) ? v : 256 - v;
-#endif
-
-      if (sum > lmins)  /* We are already worse, don't continue. */
-        break;
-   }
-
-   return (sum);
-}
-static void /* PRIVATE */
-png_setup_avg_row_only(png_structrp png_ptr, const png_uint_32 bpp,
-    const png_size_t row_bytes)
-{
-   png_bytep rp, dp, pp, lp;
-   png_uint_32 i;
-
-   png_ptr->try_row[0] = PNG_FILTER_VALUE_AVG;
-
-   for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1,
-       pp = png_ptr->prev_row + 1; i < bpp; i++)
-   {
-      *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
-   }
-
-   for (lp = png_ptr->row_buf + 1; i < row_bytes; i++)
-   {
-      *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2))
-          & 0xff);
-   }
-}
-
-static png_size_t /* PRIVATE */
-png_setup_paeth_row(png_structrp png_ptr, const png_uint_32 bpp,
-    const png_size_t row_bytes, const png_size_t lmins)
-{
-   png_bytep rp, dp, pp, cp, lp;
-   png_size_t i;
-   png_size_t sum = 0;
-   unsigned int v;
-
-   png_ptr->try_row[0] = PNG_FILTER_VALUE_PAETH;
-
-   for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1,
-       pp = png_ptr->prev_row + 1; i < bpp; i++)
-   {
-      v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
-
-#ifdef PNG_USE_ABS
-      sum += 128 - abs((int)v - 128);
-#else
-      sum += (v < 128) ? v : 256 - v;
-#endif
-   }
-
-   for (lp = png_ptr->row_buf + 1, cp = png_ptr->prev_row + 1; i < row_bytes;
-        i++)
-   {
-      int a, b, c, pa, pb, pc, p;
-
-      b = *pp++;
-      c = *cp++;
-      a = *lp++;
-
-      p = b - c;
-      pc = a - c;
-
-#ifdef PNG_USE_ABS
-      pa = abs(p);
-      pb = abs(pc);
-      pc = abs(p + pc);
-#else
-      pa = p < 0 ? -p : p;
-      pb = pc < 0 ? -pc : pc;
-      pc = (p + pc) < 0 ? -(p + pc) : p + pc;
-#endif
-
-      p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
-
-      v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
-
-#ifdef PNG_USE_ABS
-      sum += 128 - abs((int)v - 128);
-#else
-      sum += (v < 128) ? v : 256 - v;
-#endif
-
-      if (sum > lmins)  /* We are already worse, don't continue. */
-        break;
-   }
-
-   return (sum);
-}
-static void /* PRIVATE */
-png_setup_paeth_row_only(png_structrp png_ptr, const png_uint_32 bpp,
-    const png_size_t row_bytes)
-{
-   png_bytep rp, dp, pp, cp, lp;
-   png_size_t i;
-
-   png_ptr->try_row[0] = PNG_FILTER_VALUE_PAETH;
-
-   for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1,
-       pp = png_ptr->prev_row + 1; i < bpp; i++)
-   {
-      *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
-   }
-
-   for (lp = png_ptr->row_buf + 1, cp = png_ptr->prev_row + 1; i < row_bytes;
-        i++)
-   {
-      int a, b, c, pa, pb, pc, p;
-
-      b = *pp++;
-      c = *cp++;
-      a = *lp++;
-
-      p = b - c;
-      pc = a - c;
-
-#ifdef PNG_USE_ABS
-      pa = abs(p);
-      pb = abs(pc);
-      pc = abs(p + pc);
-#else
-      pa = p < 0 ? -p : p;
-      pb = pc < 0 ? -pc : pc;
-      pc = (p + pc) < 0 ? -(p + pc) : p + pc;
-#endif
-
-      p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
-
-      *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
-   }
-}
-#endif /* WRITE_FILTER */
-
-void /* PRIVATE */
-png_write_find_filter(png_structrp png_ptr, png_row_infop row_info)
-{
-#ifndef PNG_WRITE_FILTER_SUPPORTED
-   png_write_filtered_row(png_ptr, png_ptr->row_buf, row_info->rowbytes+1);
-#else
-   unsigned int filter_to_do = png_ptr->do_filter;
-   png_bytep row_buf;
-   png_bytep best_row;
-   png_uint_32 bpp;
-   png_size_t mins;
-   png_size_t row_bytes = row_info->rowbytes;
-
-   png_debug(1, "in png_write_find_filter");
-
-   /* Find out how many bytes offset each pixel is */
-   bpp = (row_info->pixel_depth + 7) >> 3;
-
-   row_buf = png_ptr->row_buf;
-   mins = PNG_SIZE_MAX - 256/* so we can detect potential overflow of the
-                               running sum */;
-
-   /* The prediction method we use is to find which method provides the
-    * smallest value when summing the absolute values of the distances
-    * from zero, using anything >= 128 as negative numbers.  This is known
-    * as the "minimum sum of absolute differences" heuristic.  Other
-    * heuristics are the "weighted minimum sum of absolute differences"
-    * (experimental and can in theory improve compression), and the "zlib
-    * predictive" method (not implemented yet), which does test compressions
-    * of lines using different filter methods, and then chooses the
-    * (series of) filter(s) that give minimum compressed data size (VERY
-    * computationally expensive).
-    *
-    * GRR 980525:  consider also
-    *
-    *   (1) minimum sum of absolute differences from running average (i.e.,
-    *       keep running sum of non-absolute differences & count of bytes)
-    *       [track dispersion, too?  restart average if dispersion too large?]
-    *
-    *  (1b) minimum sum of absolute differences from sliding average, probably
-    *       with window size <= deflate window (usually 32K)
-    *
-    *   (2) minimum sum of squared differences from zero or running average
-    *       (i.e., ~ root-mean-square approach)
-    */
-
-
-   /* We don't need to test the 'no filter' case if this is the only filter
-    * that has been chosen, as it doesn't actually do anything to the data.
-    */
-   best_row = png_ptr->row_buf;
-
-   if (PNG_SIZE_MAX/128 <= row_bytes)
-   {
-      /* Overflow can occur in the calculation, just select the lowest set
-       * filter.
-       */
-      filter_to_do &= 0U-filter_to_do;
-   }
-   else if ((filter_to_do & PNG_FILTER_NONE) != 0 &&
-         filter_to_do != PNG_FILTER_NONE)
-   {
-      /* Overflow not possible and multiple filters in the list, including the
-       * 'none' filter.
-       */
-      png_bytep rp;
-      png_size_t sum = 0;
-      png_size_t i;
-      unsigned int v;
-
-      {
-         for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++)
-         {
-            v = *rp;
-#ifdef PNG_USE_ABS
-            sum += 128 - abs((int)v - 128);
-#else
-            sum += (v < 128) ? v : 256 - v;
-#endif
-         }
-      }
-
-      mins = sum;
-   }
-
-   /* Sub filter */
-   if (filter_to_do == PNG_FILTER_SUB)
-   /* It's the only filter so no testing is needed */
-   {
-      png_setup_sub_row_only(png_ptr, bpp, row_bytes);
-      best_row = png_ptr->try_row;
-   }
-
-   else if ((filter_to_do & PNG_FILTER_SUB) != 0)
-   {
-      png_size_t sum;
-      png_size_t lmins = mins;
-
-      sum = png_setup_sub_row(png_ptr, bpp, row_bytes, lmins);
-
-      if (sum < mins)
-      {
-         mins = sum;
-         best_row = png_ptr->try_row;
-         if (png_ptr->tst_row != NULL)
-         {
-            png_ptr->try_row = png_ptr->tst_row;
-            png_ptr->tst_row = best_row;
-         }
-      }
-   }
-
-   /* Up filter */
-   if (filter_to_do == PNG_FILTER_UP)
-   {
-      png_setup_up_row_only(png_ptr, row_bytes);
-      best_row = png_ptr->try_row;
-   }
-
-   else if ((filter_to_do & PNG_FILTER_UP) != 0)
-   {
-      png_size_t sum;
-      png_size_t lmins = mins;
-
-      sum = png_setup_up_row(png_ptr, row_bytes, lmins);
-
-      if (sum < mins)
-      {
-         mins = sum;
-         best_row = png_ptr->try_row;
-         if (png_ptr->tst_row != NULL)
-         {
-            png_ptr->try_row = png_ptr->tst_row;
-            png_ptr->tst_row = best_row;
-         }
-      }
-   }
-
-   /* Avg filter */
-   if (filter_to_do == PNG_FILTER_AVG)
-   {
-      png_setup_avg_row_only(png_ptr, bpp, row_bytes);
-      best_row = png_ptr->try_row;
-   }
-
-   else if ((filter_to_do & PNG_FILTER_AVG) != 0)
-   {
-      png_size_t sum;
-      png_size_t lmins = mins;
-
-      sum= png_setup_avg_row(png_ptr, bpp, row_bytes, lmins);
-
-      if (sum < mins)
-      {
-         mins = sum;
-         best_row = png_ptr->try_row;
-         if (png_ptr->tst_row != NULL)
-         {
-            png_ptr->try_row = png_ptr->tst_row;
-            png_ptr->tst_row = best_row;
-         }
-      }
-   }
-
-   /* Paeth filter */
-   if (filter_to_do == PNG_FILTER_PAETH)
-   {
-      png_setup_paeth_row_only(png_ptr, bpp, row_bytes);
-      best_row = png_ptr->try_row;
-   }
-
-   else if ((filter_to_do & PNG_FILTER_PAETH) != 0)
-   {
-      png_size_t sum;
-      png_size_t lmins = mins;
-
-      sum = png_setup_paeth_row(png_ptr, bpp, row_bytes, lmins);
-
-      if (sum < mins)
-      {
-         best_row = png_ptr->try_row;
-         if (png_ptr->tst_row != NULL)
-         {
-            png_ptr->try_row = png_ptr->tst_row;
-            png_ptr->tst_row = best_row;
-         }
-      }
-   }
-
-   /* Do the actual writing of the filtered row data from the chosen filter. */
-   png_write_filtered_row(png_ptr, best_row, row_info->rowbytes+1);
-
-#endif /* WRITE_FILTER */
-}
-
-
-/* Do the actual writing of a previously filtered row. */
-static void
-png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row,
-    png_size_t full_row_length/*includes filter byte*/)
-{
-   png_debug(1, "in png_write_filtered_row");
-
-   png_debug1(2, "filter = %d", filtered_row[0]);
-
-   png_compress_IDAT(png_ptr, filtered_row, full_row_length, Z_NO_FLUSH);
-
-#ifdef PNG_WRITE_FILTER_SUPPORTED
-   /* Swap the current and previous rows */
-   if (png_ptr->prev_row != NULL)
-   {
-      png_bytep tptr;
-
-      tptr = png_ptr->prev_row;
-      png_ptr->prev_row = png_ptr->row_buf;
-      png_ptr->row_buf = tptr;
-   }
-#endif /* WRITE_FILTER */
-
-   /* Finish row - updates counters and flushes zlib if last row */
-   png_write_finish_row(png_ptr);
-
-#ifdef PNG_WRITE_FLUSH_SUPPORTED
-   png_ptr->flush_rows++;
-
-   if (png_ptr->flush_dist > 0 &&
-       png_ptr->flush_rows >= png_ptr->flush_dist)
-   {
-      png_write_flush(png_ptr);
-   }
-#endif /* WRITE_FLUSH */
-}
-#endif /* WRITE */
diff --git a/src/png/libpng/powerpc/filter_vsx_intrinsics.c b/src/png/libpng/powerpc/filter_vsx_intrinsics.c
deleted file mode 100644
index e3de496bd..000000000
--- a/src/png/libpng/powerpc/filter_vsx_intrinsics.c
+++ /dev/null
@@ -1,767 +0,0 @@
-/* filter_vsx_intrinsics.c - PowerPC optimised filter functions
- *
- * Copyright (c) 2017 Glenn Randers-Pehrson
- * Written by Vadim Barkov, 2017.
- * Last changed in libpng 1.6.29 [March 16, 2017]
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-#include <stdio.h>
-#include <stdint.h>
-#include "../pngpriv.h"
-
-#ifdef PNG_READ_SUPPORTED
-
-/* This code requires -maltivec and -mvsx on the command line: */
-#if PNG_POWERPC_VSX_IMPLEMENTATION == 1 /* intrinsics code from pngpriv.h */
-
-#include <altivec.h>
-
-#if PNG_POWERPC_VSX_OPT > 0
-
-#ifndef __VSX__
-#  error "This code requires VSX support (POWER7 and later). Please provide -mvsx compiler flag."
-#endif
-
-#define vec_ld_unaligned(vec,data) vec = vec_vsx_ld(0,data)
-#define vec_st_unaligned(vec,data) vec_vsx_st(vec,0,data)
-
-
-/* Functions in this file look at most 3 pixels (a,b,c) to predict the 4th (d).
- * They're positioned like this:
- *    prev:  c b
- *    row:   a d
- * The Sub filter predicts d=a, Avg d=(a+b)/2, and Paeth predicts d to be
- * whichever of a, b, or c is closest to p=a+b-c.
- * ( this is taken from ../intel/filter_sse2_intrinsics.c )
- */
-
-#define vsx_declare_common_vars(row_info,row,prev_row,offset) \
-   png_byte i;\
-   png_bytep rp = row + offset;\
-   png_const_bytep pp = prev_row;\
-   png_size_t unaligned_top = 16 - (((png_size_t)rp % 16));\
-   png_size_t istop;\
-   if(unaligned_top == 16)\
-      unaligned_top = 0;\
-   istop = row_info->rowbytes;\
-   if((unaligned_top < istop))\
-      istop -= unaligned_top;\
-   else{\
-      unaligned_top = istop;\
-      istop = 0;\
-   }
-
-void png_read_filter_row_up_vsx(png_row_infop row_info, png_bytep row,
-                                png_const_bytep prev_row)
-{
-   vector unsigned char rp_vec;
-   vector unsigned char pp_vec;
-   vsx_declare_common_vars(row_info,row,prev_row,0)
-
-   /* Altivec operations require 16-byte aligned data
-    * but input can be unaligned. So we calculate
-    * unaligned part as usual.
-    */
-   for (i = 0; i < unaligned_top; i++)
-   {
-      *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
-      rp++;
-   }
-
-   /* Using SIMD while we can */
-   while( istop >= 16 )
-   {
-      rp_vec = vec_ld(0,rp);
-      vec_ld_unaligned(pp_vec,pp);
-
-      rp_vec = vec_add(rp_vec,pp_vec);
-
-      vec_st(rp_vec,0,rp);
-
-      pp += 16;
-      rp += 16;
-      istop -= 16;
-   }
-
-   if(istop > 0)
-   {
-      /* If byte count of row is not divisible by 16
-       * we will process remaining part as usual
-       */
-      for (i = 0; i < istop; i++)
-      {
-         *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
-         rp++;
-      }
-}
-
-}
-
-static const vector unsigned char VSX_LEFTSHIFTED1_4 = {16,16,16,16, 0, 1, 2, 3,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_LEFTSHIFTED2_4 = {16,16,16,16,16,16,16,16, 4, 5, 6, 7,16,16,16,16};
-static const vector unsigned char VSX_LEFTSHIFTED3_4 = {16,16,16,16,16,16,16,16,16,16,16,16, 8, 9,10,11};
-
-static const vector unsigned char VSX_LEFTSHIFTED1_3 = {16,16,16, 0, 1, 2,16,16,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_LEFTSHIFTED2_3 = {16,16,16,16,16,16, 3, 4, 5,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_LEFTSHIFTED3_3 = {16,16,16,16,16,16,16,16,16, 6, 7, 8,16,16,16,16};
-static const vector unsigned char VSX_LEFTSHIFTED4_3 = {16,16,16,16,16,16,16,16,16,16,16,16, 9,10,11,16};
-
-static const vector unsigned char VSX_NOT_SHIFTED1_4 = {16,16,16,16, 4, 5, 6, 7,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_NOT_SHIFTED2_4 = {16,16,16,16,16,16,16,16, 8, 9,10,11,16,16,16,16};
-static const vector unsigned char VSX_NOT_SHIFTED3_4 = {16,16,16,16,16,16,16,16,16,16,16,16,12,13,14,15};
-
-static const vector unsigned char VSX_NOT_SHIFTED1_3 = {16,16,16, 3, 4, 5,16,16,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_NOT_SHIFTED2_3 = {16,16,16,16,16,16, 6, 7, 8,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_NOT_SHIFTED3_3 = {16,16,16,16,16,16,16,16,16, 9,10,11,16,16,16,16};
-static const vector unsigned char VSX_NOT_SHIFTED4_3 = {16,16,16,16,16,16,16,16,16,16,16,16,12,13,14,16};
-
-static const vector unsigned char VSX_CHAR_ZERO = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
-#ifdef __LITTLE_ENDIAN__
-
-static const vector unsigned char VSX_CHAR_TO_SHORT1_4 = { 4,16, 5,16, 6,16, 7,16,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_CHAR_TO_SHORT2_4 = { 8,16, 9,16,10,16,11,16,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_CHAR_TO_SHORT3_4 = {12,16,13,16,14,16,15,16,16,16,16,16,16,16,16,16};
-
-static const vector unsigned char VSX_SHORT_TO_CHAR1_4 = {16,16,16,16, 0, 2, 4, 6,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_SHORT_TO_CHAR2_4 = {16,16,16,16,16,16,16,16, 0, 2, 4, 6,16,16,16,16};
-static const vector unsigned char VSX_SHORT_TO_CHAR3_4 = {16,16,16,16,16,16,16,16,16,16,16,16, 0, 2, 4, 6};
-
-static const vector unsigned char VSX_CHAR_TO_SHORT1_3 = { 3,16, 4,16, 5,16,16,16,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_CHAR_TO_SHORT2_3 = { 6,16, 7,16, 8,16,16,16,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_CHAR_TO_SHORT3_3 = { 9,16,10,16,11,16,16,16,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_CHAR_TO_SHORT4_3 = {12,16,13,16,14,16,16,16,16,16,16,16,16,16,16,16};
-
-static const vector unsigned char VSX_SHORT_TO_CHAR1_3 = {16,16,16, 0, 2, 4,16,16,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_SHORT_TO_CHAR2_3 = {16,16,16,16,16,16, 0, 2, 4,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_SHORT_TO_CHAR3_3 = {16,16,16,16,16,16,16,16,16, 0, 2, 4,16,16,16,16};
-static const vector unsigned char VSX_SHORT_TO_CHAR4_3 = {16,16,16,16,16,16,16,16,16,16,16,16, 0, 2, 4,16};
-
-#elif defined(__BIG_ENDIAN__)
-
-static const vector unsigned char VSX_CHAR_TO_SHORT1_4 = {16, 4,16, 5,16, 6,16, 7,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_CHAR_TO_SHORT2_4 = {16, 8,16, 9,16,10,16,11,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_CHAR_TO_SHORT3_4 = {16,12,16,13,16,14,16,15,16,16,16,16,16,16,16,16};
-
-static const vector unsigned char VSX_SHORT_TO_CHAR1_4 = {16,16,16,16, 1, 3, 5, 7,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_SHORT_TO_CHAR2_4 = {16,16,16,16,16,16,16,16, 1, 3, 5, 7,16,16,16,16};
-static const vector unsigned char VSX_SHORT_TO_CHAR3_4 = {16,16,16,16,16,16,16,16,16,16,16,16, 1, 3, 5, 7};
-
-static const vector unsigned char VSX_CHAR_TO_SHORT1_3 = {16, 3,16, 4,16, 5,16,16,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_CHAR_TO_SHORT2_3 = {16, 6,16, 7,16, 8,16,16,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_CHAR_TO_SHORT3_3 = {16, 9,16,10,16,11,16,16,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_CHAR_TO_SHORT4_3 = {16,12,16,13,16,14,16,16,16,16,16,16,16,16,16,16};
-
-static const vector unsigned char VSX_SHORT_TO_CHAR1_3 = {16,16,16, 1, 3, 5,16,16,16,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_SHORT_TO_CHAR2_3 = {16,16,16,16,16,16, 1, 3, 5,16,16,16,16,16,16,16};
-static const vector unsigned char VSX_SHORT_TO_CHAR3_3 = {16,16,16,16,16,16,16,16,16, 1, 3, 5,16,16,16,16};
-static const vector unsigned char VSX_SHORT_TO_CHAR4_3 = {16,16,16,16,16,16,16,16,16,16,16,16, 1, 3, 5,16};
-
-#endif
-
-#define vsx_char_to_short(vec,offset,bpp) (vector unsigned short)vec_perm((vec),VSX_CHAR_ZERO,VSX_CHAR_TO_SHORT##offset##_##bpp)
-#define vsx_short_to_char(vec,offset,bpp) vec_perm(((vector unsigned char)(vec)),VSX_CHAR_ZERO,VSX_SHORT_TO_CHAR##offset##_##bpp)
-
-#ifdef PNG_USE_ABS
-#  define vsx_abs(number) abs(number)
-#else
-#  define vsx_abs(number) (number > 0) ? (number) : -(number)
-#endif
-
-void png_read_filter_row_sub4_vsx(png_row_infop row_info, png_bytep row,
-                                  png_const_bytep prev_row)
-{
-   const png_byte bpp = 4;
-
-   vector unsigned char rp_vec;
-   vector unsigned char part_vec;
-
-   vsx_declare_common_vars(row_info,row,prev_row,bpp)
-
-   PNG_UNUSED(pp)
-
-   /* Altivec operations require 16-byte aligned data
-    * but input can be unaligned. So we calculate
-    * unaligned part as usual.
-    */
-   for (i = 0; i < unaligned_top; i++)
-   {
-      *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
-      rp++;
-   }
-
-   /* Using SIMD while we can */
-   while( istop >= 16 )
-   {
-      for(i=0;i < bpp ; i++)
-      {
-         *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
-         rp++;
-      }
-      rp -= bpp;
-
-      rp_vec = vec_ld(0,rp);
-      part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED1_4);
-      rp_vec = vec_add(rp_vec,part_vec);
-
-      part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED2_4);
-      rp_vec = vec_add(rp_vec,part_vec);
-
-      part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED3_4);
-      rp_vec = vec_add(rp_vec,part_vec);
-
-      vec_st(rp_vec,0,rp);
-
-      rp += 16;
-      istop -= 16;
-   }
-
-   if(istop > 0)
-      for (i = 0; i < istop % 16; i++)
-      {
-         *rp = (png_byte)(((int)(*rp) + (int)(*(rp - bpp))) & 0xff);
-         rp++;
-      }
-
-}
-
-void png_read_filter_row_sub3_vsx(png_row_infop row_info, png_bytep row,
-                                  png_const_bytep prev_row)
-{
-   const png_byte bpp = 3;
-
-   vector unsigned char rp_vec;
-   vector unsigned char part_vec;
-
-   vsx_declare_common_vars(row_info,row,prev_row,bpp)
-
-   PNG_UNUSED(pp)
-
-   /* Altivec operations require 16-byte aligned data
-    * but input can be unaligned. So we calculate
-    * unaligned part as usual.
-    */
-   for (i = 0; i < unaligned_top; i++)
-   {
-      *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
-      rp++;
-   }
-
-   /* Using SIMD while we can */
-   while( istop >= 16 )
-   {
-      for(i=0;i < bpp ; i++)
-      {
-         *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
-         rp++;
-      }
-      rp -= bpp;
-
-      rp_vec = vec_ld(0,rp);
-      part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED1_3);
-      rp_vec = vec_add(rp_vec,part_vec);
-
-      part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED2_3);
-      rp_vec = vec_add(rp_vec,part_vec);
-
-      part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED3_3);
-      rp_vec = vec_add(rp_vec,part_vec);
-
-      part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED4_3);
-      rp_vec = vec_add(rp_vec,part_vec);
-
-      vec_st(rp_vec,0,rp);
-      rp += 15;
-      istop -= 16;
-
-      /* Since 16 % bpp = 16 % 3 = 1, last element of array must
-       * be proceeded manually
-       */
-      *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
-      rp++;
-   }
-
-   if(istop > 0)
-      for (i = 0; i < istop % 16; i++)
-      {
-         *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
-         rp++;
-      }
-}
-
-void png_read_filter_row_avg4_vsx(png_row_infop row_info, png_bytep row,
-                                  png_const_bytep prev_row)
-{
-   const png_byte bpp = 4;
-
-   vector unsigned char rp_vec;
-   vector unsigned char pp_vec;
-   vector unsigned char pp_part_vec;
-   vector unsigned char rp_part_vec;
-   vector unsigned char avg_vec;
-
-   vsx_declare_common_vars(row_info,row,prev_row,bpp)
-   rp -= bpp;
-   if(istop >= bpp)
-      istop -= bpp;
-
-   for (i = 0; i < bpp; i++)
-   {
-      *rp = (png_byte)(((int)(*rp) +
-         ((int)(*pp++) / 2 )) & 0xff);
-
-      rp++;
-   }
-
-   /* Altivec operations require 16-byte aligned data
-    * but input can be unaligned. So we calculate
-    * unaligned part as usual.
-    */
-   for (i = 0; i < unaligned_top; i++)
-   {
-      *rp = (png_byte)(((int)(*rp) +
-         (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
-
-      rp++;
-   }
-
-   /* Using SIMD while we can */
-   while( istop >= 16 )
-   {
-      for(i=0;i < bpp ; i++)
-      {
-         *rp = (png_byte)(((int)(*rp) +
-            (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
-
-         rp++;
-      }
-      rp -= bpp;
-      pp -= bpp;
-
-      vec_ld_unaligned(pp_vec,pp);
-      rp_vec = vec_ld(0,rp);
-
-      rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED1_4);
-      pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED1_4);
-      avg_vec = vec_avg(rp_part_vec,pp_part_vec);
-      avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
-      rp_vec = vec_add(rp_vec,avg_vec);
-
-      rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED2_4);
-      pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED2_4);
-      avg_vec = vec_avg(rp_part_vec,pp_part_vec);
-      avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
-      rp_vec = vec_add(rp_vec,avg_vec);
-
-      rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED3_4);
-      pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED3_4);
-      avg_vec = vec_avg(rp_part_vec,pp_part_vec);
-      avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
-      rp_vec = vec_add(rp_vec,avg_vec);
-
-      vec_st(rp_vec,0,rp);
-
-      rp += 16;
-      pp += 16;
-      istop -= 16;
-   }
-
-   if(istop  > 0)
-      for (i = 0; i < istop % 16; i++)
-      {
-         *rp = (png_byte)(((int)(*rp) +
-            (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
-
-         rp++;
-      }
-}
-
-void png_read_filter_row_avg3_vsx(png_row_infop row_info, png_bytep row,
-                                  png_const_bytep prev_row)
-{
-  const png_byte bpp = 3;
-
-  vector unsigned char rp_vec;
-  vector unsigned char pp_vec;
-  vector unsigned char pp_part_vec;
-  vector unsigned char rp_part_vec;
-  vector unsigned char avg_vec;
-
-  vsx_declare_common_vars(row_info,row,prev_row,bpp)
-  rp -= bpp;
-  if(istop >= bpp)
-     istop -= bpp;
-
-  for (i = 0; i < bpp; i++)
-  {
-     *rp = (png_byte)(((int)(*rp) +
-        ((int)(*pp++) / 2 )) & 0xff);
-
-     rp++;
-  }
-
-  /* Altivec operations require 16-byte aligned data
-   * but input can be unaligned. So we calculate
-   * unaligned part as usual.
-   */
-  for (i = 0; i < unaligned_top; i++)
-  {
-     *rp = (png_byte)(((int)(*rp) +
-        (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
-
-     rp++;
-  }
-
-  /* Using SIMD while we can */
-  while( istop >= 16 )
-  {
-     for(i=0;i < bpp ; i++)
-     {
-        *rp = (png_byte)(((int)(*rp) +
-           (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
-
-        rp++;
-     }
-     rp -= bpp;
-     pp -= bpp;
-
-     vec_ld_unaligned(pp_vec,pp);
-     rp_vec = vec_ld(0,rp);
-
-     rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED1_3);
-     pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED1_3);
-     avg_vec = vec_avg(rp_part_vec,pp_part_vec);
-     avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
-     rp_vec = vec_add(rp_vec,avg_vec);
-
-     rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED2_3);
-     pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED2_3);
-     avg_vec = vec_avg(rp_part_vec,pp_part_vec);
-     avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
-     rp_vec = vec_add(rp_vec,avg_vec);
-
-     rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED3_3);
-     pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED3_3);
-     avg_vec = vec_avg(rp_part_vec,pp_part_vec);
-     avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
-     rp_vec = vec_add(rp_vec,avg_vec);
-
-     rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED4_3);
-     pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED4_3);
-     avg_vec = vec_avg(rp_part_vec,pp_part_vec);
-     avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
-     rp_vec = vec_add(rp_vec,avg_vec);
-
-     vec_st(rp_vec,0,rp);
-
-     rp += 15;
-     pp += 15;
-     istop -= 16;
-
-     /* Since 16 % bpp = 16 % 3 = 1, last element of array must
-      * be proceeded manually
-      */
-     *rp = (png_byte)(((int)(*rp) +
-        (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
-     rp++;
-  }
-
-  if(istop  > 0)
-     for (i = 0; i < istop % 16; i++)
-     {
-        *rp = (png_byte)(((int)(*rp) +
-           (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
-
-        rp++;
-     }
-}
-
-/* Bytewise c ? t : e. */
-#define if_then_else(c,t,e) vec_sel(e,t,c)
-
-#define vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp) {\
-      c = *(pp - bpp);\
-      a = *(rp - bpp);\
-      b = *pp++;\
-      p = b - c;\
-      pc = a - c;\
-      pa = vsx_abs(p);\
-      pb = vsx_abs(pc);\
-      pc = vsx_abs(p + pc);\
-      if (pb < pa) pa = pb, a = b;\
-      if (pc < pa) a = c;\
-      a += *rp;\
-      *rp++ = (png_byte)a;\
-      }
-
-void png_read_filter_row_paeth4_vsx(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev_row)
-{
-   const png_byte bpp = 4;
-
-   int a, b, c, pa, pb, pc, p;
-   vector unsigned char rp_vec;
-   vector unsigned char pp_vec;
-   vector unsigned short a_vec,b_vec,c_vec,nearest_vec;
-   vector signed short pa_vec,pb_vec,pc_vec,smallest_vec;
-
-   vsx_declare_common_vars(row_info,row,prev_row,bpp)
-   rp -= bpp;
-   if(istop >= bpp)
-      istop -= bpp;
-
-   /* Process the first pixel in the row completely (this is the same as 'up'
-    * because there is only one candidate predictor for the first row).
-    */
-   for(i = 0; i < bpp ; i++)
-   {
-      *rp = (png_byte)( *rp + *pp);
-      rp++;
-      pp++;
-   }
-
-   for(i = 0; i < unaligned_top ; i++)
-   {
-      vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
-   }
-
-   while( istop >= 16)
-   {
-      for(i = 0; i < bpp ; i++)
-      {
-         vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
-      }
-
-      rp -= bpp;
-      pp -= bpp;
-      rp_vec = vec_ld(0,rp);
-      vec_ld_unaligned(pp_vec,pp);
-
-      a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED1_4),1,4);
-      b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED1_4),1,4);
-      c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED1_4),1,4);
-      pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
-      pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
-      pc_vec = vec_add(pa_vec,pb_vec);
-      pa_vec = vec_abs(pa_vec);
-      pb_vec = vec_abs(pb_vec);
-      pc_vec = vec_abs(pc_vec);
-      smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
-      nearest_vec =  if_then_else(
-            vec_cmpeq(pa_vec,smallest_vec),
-            a_vec,
-            if_then_else(
-              vec_cmpeq(pb_vec,smallest_vec),
-              b_vec,
-              c_vec
-              )
-            );
-      rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,1,4)));
-
-      a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED2_4),2,4);
-      b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED2_4),2,4);
-      c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED2_4),2,4);
-      pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
-      pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
-      pc_vec = vec_add(pa_vec,pb_vec);
-      pa_vec = vec_abs(pa_vec);
-      pb_vec = vec_abs(pb_vec);
-      pc_vec = vec_abs(pc_vec);
-      smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
-      nearest_vec =  if_then_else(
-            vec_cmpeq(pa_vec,smallest_vec),
-            a_vec,
-            if_then_else(
-              vec_cmpeq(pb_vec,smallest_vec),
-              b_vec,
-              c_vec
-              )
-            );
-      rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,2,4)));
-
-      a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED3_4),3,4);
-      b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED3_4),3,4);
-      c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED3_4),3,4);
-      pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
-      pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
-      pc_vec = vec_add(pa_vec,pb_vec);
-      pa_vec = vec_abs(pa_vec);
-      pb_vec = vec_abs(pb_vec);
-      pc_vec = vec_abs(pc_vec);
-      smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
-      nearest_vec =  if_then_else(
-            vec_cmpeq(pa_vec,smallest_vec),
-            a_vec,
-            if_then_else(
-              vec_cmpeq(pb_vec,smallest_vec),
-              b_vec,
-              c_vec
-              )
-            );
-      rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,3,4)));
-
-      vec_st(rp_vec,0,rp);
-
-      rp += 16;
-      pp += 16;
-      istop -= 16;
-   }
-
-   if(istop > 0)
-      for (i = 0; i < istop % 16; i++)
-      {
-         vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
-      }
-}
-
-void png_read_filter_row_paeth3_vsx(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev_row)
-{
-  const png_byte bpp = 3;
-
-  int a, b, c, pa, pb, pc, p;
-  vector unsigned char rp_vec;
-  vector unsigned char pp_vec;
-  vector unsigned short a_vec,b_vec,c_vec,nearest_vec;
-  vector signed short pa_vec,pb_vec,pc_vec,smallest_vec;
-
-  vsx_declare_common_vars(row_info,row,prev_row,bpp)
-  rp -= bpp;
-  if(istop >= bpp)
-     istop -= bpp;
-
-  /* Process the first pixel in the row completely (this is the same as 'up'
-   * because there is only one candidate predictor for the first row).
-   */
-  for(i = 0; i < bpp ; i++)
-  {
-     *rp = (png_byte)( *rp + *pp);
-     rp++;
-     pp++;
-  }
-
-  for(i = 0; i < unaligned_top ; i++)
-  {
-     vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
-  }
-
-  while( istop >= 16)
-  {
-     for(i = 0; i < bpp ; i++)
-     {
-        vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
-     }
-
-     rp -= bpp;
-     pp -= bpp;
-     rp_vec = vec_ld(0,rp);
-     vec_ld_unaligned(pp_vec,pp);
-
-     a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED1_3),1,3);
-     b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED1_3),1,3);
-     c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED1_3),1,3);
-     pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
-     pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
-     pc_vec = vec_add(pa_vec,pb_vec);
-     pa_vec = vec_abs(pa_vec);
-     pb_vec = vec_abs(pb_vec);
-     pc_vec = vec_abs(pc_vec);
-     smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
-     nearest_vec =  if_then_else(
-           vec_cmpeq(pa_vec,smallest_vec),
-           a_vec,
-           if_then_else(
-             vec_cmpeq(pb_vec,smallest_vec),
-             b_vec,
-             c_vec
-             )
-           );
-     rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,1,3)));
-
-     a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED2_3),2,3);
-     b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED2_3),2,3);
-     c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED2_3),2,3);
-     pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
-     pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
-     pc_vec = vec_add(pa_vec,pb_vec);
-     pa_vec = vec_abs(pa_vec);
-     pb_vec = vec_abs(pb_vec);
-     pc_vec = vec_abs(pc_vec);
-     smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
-     nearest_vec =  if_then_else(
-           vec_cmpeq(pa_vec,smallest_vec),
-           a_vec,
-           if_then_else(
-             vec_cmpeq(pb_vec,smallest_vec),
-             b_vec,
-             c_vec
-             )
-           );
-     rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,2,3)));
-
-     a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED3_3),3,3);
-     b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED3_3),3,3);
-     c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED3_3),3,3);
-     pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
-     pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
-     pc_vec = vec_add(pa_vec,pb_vec);
-     pa_vec = vec_abs(pa_vec);
-     pb_vec = vec_abs(pb_vec);
-     pc_vec = vec_abs(pc_vec);
-     smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
-     nearest_vec =  if_then_else(
-           vec_cmpeq(pa_vec,smallest_vec),
-           a_vec,
-           if_then_else(
-             vec_cmpeq(pb_vec,smallest_vec),
-             b_vec,
-             c_vec
-             )
-           );
-     rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,3,3)));
-
-     a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED4_3),4,3);
-     b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED4_3),4,3);
-     c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED4_3),4,3);
-     pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
-     pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
-     pc_vec = vec_add(pa_vec,pb_vec);
-     pa_vec = vec_abs(pa_vec);
-     pb_vec = vec_abs(pb_vec);
-     pc_vec = vec_abs(pc_vec);
-     smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
-     nearest_vec =  if_then_else(
-           vec_cmpeq(pa_vec,smallest_vec),
-           a_vec,
-           if_then_else(
-             vec_cmpeq(pb_vec,smallest_vec),
-             b_vec,
-             c_vec
-             )
-           );
-     rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,4,3)));
-
-     vec_st(rp_vec,0,rp);
-
-     rp += 15;
-     pp += 15;
-     istop -= 16;
-
-     /* Since 16 % bpp = 16 % 3 = 1, last element of array must
-      * be proceeded manually
-      */
-     vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
-  }
-
-  if(istop > 0)
-     for (i = 0; i < istop % 16; i++)
-     {
-        vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
-     }
-}
-
-#endif /* PNG_POWERPC_VSX_OPT > 0 */
-#endif /* PNG_POWERPC_VSX_IMPLEMENTATION == 1 (intrinsics) */
-#endif /* READ */
diff --git a/src/png/libpng/powerpc/powerpc_init.c b/src/png/libpng/powerpc/powerpc_init.c
deleted file mode 100644
index 07016177c..000000000
--- a/src/png/libpng/powerpc/powerpc_init.c
+++ /dev/null
@@ -1,125 +0,0 @@
-
-/* powerpc_init.c - POWERPC optimised filter functions
- *
- * Copyright (c) 2017 Glenn Randers-Pehrson
- * Written by Vadim Barkov, 2017.
- * Last changed in libpng 1.6.29 [March 16, 2017]
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-/* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are
- * called.
- */
-#define _POSIX_SOURCE 1
-
-#include <stdio.h>
-#include "../pngpriv.h"
-
-#ifdef PNG_READ_SUPPORTED
-
-#if PNG_POWERPC_VSX_OPT > 0
-#ifdef PNG_POWERPC_VSX_CHECK_SUPPORTED /* Do run-time checks */
-/* WARNING: it is strongly recommended that you do not build libpng with
- * run-time checks for CPU features if at all possible.  In the case of the PowerPC
- * VSX instructions there is no processor-specific way of detecting the
- * presence of the required support, therefore run-time detection is extremely
- * OS specific.
- *
- * You may set the macro PNG_POWERPC_VSX_FILE to the file name of file containing
- * a fragment of C source code which defines the png_have_vsx function.  There
- * are a number of implementations in contrib/powerpc-vsx, but the only one that
- * has partial support is contrib/powerpc-vsx/linux.c - a generic Linux
- * implementation which reads /proc/cpufino.
- */
-#ifndef PNG_POWERPC_VSX_FILE
-#  ifdef __linux__
-#     define  PNG_POWERPC_VSX_FILE "contrib/powerpc-vsx/linux_aux.c"
-#  endif
-#endif
-
-#ifdef PNG_POWERPC_VSX_FILE
-
-#include <signal.h> /* for sig_atomic_t */
-static int png_have_vsx(png_structp png_ptr);
-#include PNG_POWERPC_VSX_FILE
-
-#else  /* PNG_POWERPC_VSX_FILE */
-#  error "PNG_POWERPC_VSX_FILE undefined: no support for run-time POWERPC VSX checks"
-#endif /* PNG_POWERPC_VSX_FILE */
-#endif /* PNG_POWERPC_VSX_CHECK_SUPPORTED */
-
-void
-png_init_filter_functions_vsx(png_structp pp, unsigned int bpp)
-{
-   /* The switch statement is compiled in for POWERPC_VSX_API, the call to
-    * png_have_vsx is compiled in for POWERPC_VSX_CHECK. If both are defined
-    * the check is only performed if the API has not set the PowerPC option on
-    * or off explicitly. In this case the check controls what happens.
-    */
-
-#ifdef PNG_POWERPC_VSX_API_SUPPORTED
-   switch ((pp->options >> PNG_POWERPC_VSX) & 3)
-   {
-      case PNG_OPTION_UNSET:
-         /* Allow the run-time check to execute if it has been enabled -
-          * thus both API and CHECK can be turned on.  If it isn't supported
-          * this case will fall through to the 'default' below, which just
-          * returns.
-          */
-#endif /* PNG_POWERPC_VSX_API_SUPPORTED */
-#ifdef PNG_POWERPC_VSX_CHECK_SUPPORTED
-         {
-            static volatile sig_atomic_t no_vsx = -1; /* not checked */
-
-            if (no_vsx < 0)
-               no_vsx = !png_have_vsx(pp);
-
-            if (no_vsx)
-               return;
-         }
-#ifdef PNG_POWERPC_VSX_API_SUPPORTED
-         break;
-#endif
-#endif /* PNG_POWERPC_VSX_CHECK_SUPPORTED */
-
-#ifdef PNG_POWERPC_VSX_API_SUPPORTED
-      default: /* OFF or INVALID */
-         return;
-
-      case PNG_OPTION_ON:
-         /* Option turned on */
-         break;
-   }
-#endif
-
-   /* IMPORTANT: any new internal functions used here must be declared using
-    * PNG_INTERNAL_FUNCTION in ../pngpriv.h.  This is required so that the
-    * 'prefix' option to configure works:
-    *
-    *    ./configure --with-libpng-prefix=foobar_
-    *
-    * Verify you have got this right by running the above command, doing a build
-    * and examining pngprefix.h; it must contain a #define for every external
-    * function you add.  (Notice that this happens automatically for the
-    * initialization function.)
-    */
-   pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_vsx;
-
-   if (bpp == 3)
-   {
-      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_vsx;
-      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_vsx;
-      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_vsx;
-   }
-
-   else if (bpp == 4)
-   {
-      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_vsx;
-      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_vsx;
-      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_vsx;
-   }
-}
-#endif /* PNG_POWERPC_VSX_OPT > 0 */
-#endif /* READ */
diff --git a/src/png/libpng/scripts/checksym.awk b/src/png/libpng/scripts/checksym.awk
deleted file mode 100644
index fe3af55e0..000000000
--- a/src/png/libpng/scripts/checksym.awk
+++ /dev/null
@@ -1,173 +0,0 @@
-#!/bin/awk -f
-# Check a list of symbols against the master definition
-# (official) list.  Arguments:
-#
-# awk -f checksym.awk official-def list-to-check
-#
-# Output is a file in the current directory called 'symbols.new',
-# the value of the awk variable "of" (which can be changed on the
-# command line if required.)  stdout holds error messages.  Error
-# code indicates success or failure.
-#
-# NOTE: this is a pure, old fashioned, awk script.  It will
-# work with any awk
-
-BEGIN{
-   err=0
-   master=""        # master file
-   official[1] = "" # defined symbols from master file
-   symbol[1] = ""   # defined symbols from png.h
-   removed[1] = ""  # removed symbols from png.h
-   lasto = 0        # last ordinal value from png.h
-   mastero = 0      # highest ordinal in master file
-   symbolo = 0      # highest ordinal in png.h
-   missing = "error"# log an error on missing symbols
-   of="symbols.new" # default to a fixed name
-}
-
-# Read existing definitions from the master file (the first
-# file on the command line.)  This must be a def file and it
-# has definition lines (others are ignored) of the form:
-#
-#   symbol @ordinal
-#
-master == "" {
-   master = FILENAME
-}
-FILENAME==master && NF==2 && $2~/^@/ && $1!~/^;/ {
-   o=0+substr($2,2)
-   if (o > 0) {
-      if (official[o] == "") {
-         official[o] = $1
-         if (o > mastero) mastero = o
-         next
-      } else
-         print master ": duplicated symbol:", official[o] ":", $0
-   } else
-      print master ": bad export line format:", $0
-   err = 1
-}
-FILENAME==master && $1==";missing" && NF==2{
-   # This allows the master file to control how missing symbols
-   # are handled; symbols that aren't in either the master or
-   # the new file.  Valid values are 'ignore', 'warning' and
-   # 'error'
-   missing = $2
-}
-FILENAME==master {
-   next
-}
-
-# Read new definitions, these are free form but the lines must
-# just be symbol definitions.  Lines will be commented out for
-# 'removed' symbols, introduced in png.h using PNG_REMOVED rather
-# than PNG_EXPORT.  Use symbols.dfn or pngwin.dfn to generate the
-# input file.
-#
-#  symbol @ordinal   # two fields, exported symbol
-#  ; symbol @ordinal # three fields, removed symbol
-#  ; @ordinal        # two fields, the last ordinal
-NF==2 && $1 == ";" && $2 ~ /^@[1-9][0-9]*$/ { # last ordinal
-   o=0+substr($2,2)
-   if (lasto == 0 || lasto == o)
-      lasto=o
-   else {
-      print "png.h: duplicated last ordinal:", lasto, o
-      err = 1
-   }
-   next
-}
-NF==3 && $1 == ";" && $3 ~ /^@[1-9][0-9]*$/ { # removed symbol
-   o=0+substr($3,2)
-   if (removed[o] == "" || removed[o] == $2) {
-      removed[o] = $2
-      if (o > symbolo) symbolo = o
-   } else {
-      print "png.h: duplicated removed symbol", o ": '" removed[o] "' != '" $2 "'"
-      err = 1
-   }
-   next
-}
-NF==2 && $2 ~ /^@[1-9][0-9]*$/ { # exported symbol
-   o=0+substr($2,2)
-   if (symbol[o] == "" || symbol[o] == $1) {
-      symbol[o] = $1
-      if (o > symbolo) symbolo = o
-   } else {
-      print "png.h: duplicated symbol", o ": '" symbol[o] "' != '" $1 "'"
-      err = 1
-   }
-}
-{
-   next # skip all other lines
-}
-
-# At the end check for symbols marked as both duplicated and removed
-END{
-   if (symbolo > lasto) {
-      print "highest symbol ordinal in png.h,", symbolo ", exceeds last ordinal from png.h", lasto
-      err = 1
-   }
-   if (mastero > lasto) {
-      print "highest symbol ordinal in", master ",", mastero ", exceeds last ordinal from png.h", lasto
-      err = 1
-   }
-   unexported=0
-   # Add a standard header to symbols.new:
-   print ";Version INSERT-VERSION-HERE" >of
-   print ";--------------------------------------------------------------" >of
-   print "; LIBPNG symbol list as a Win32 DEF file" >of
-   print "; Contains all the symbols that can be exported from libpng" >of
-   print ";--------------------------------------------------------------" >of
-   print "LIBRARY" >of
-   print "" >of
-   print "EXPORTS" >of
-
-   for (o=1; o<=lasto; ++o) {
-      if (symbol[o] == "" && removed[o] == "") {
-         if (unexported == 0) unexported = o
-         if (official[o] == "") {
-            # missing in export list too, so ok
-            if (o < lasto) continue
-         }
-      }
-      if (unexported != 0) {
-         # Symbols in the .def but not in the new file are errors, but
-         # the 'unexported' symbols aren't in either.  By default this
-         # is an error too (see the setting of 'missing' at the start),
-         # but this can be reset on the command line or by stuff in the
-         # file - see the comments above.
-         if (missing != "ignore") {
-            if (o-1 > unexported)
-               print "png.h:", missing ": missing symbols:", unexported "-" o-1
-            else
-               print "png.h:", missing ": missing symbol:", unexported
-            if (missing != "warning")
-               err = 1
-         }
-         unexported = 0
-      }
-      if (symbol[o] != "" && removed[o] != "") {
-         print "png.h: symbol", o, "both exported as '" symbol[o] "' and removed as '" removed[o] "'"
-         err = 1
-      } else if (symbol[o] != official[o]) {
-         # either the symbol is missing somewhere or it changed
-         err = 1
-         if (symbol[o] == "")
-            print "png.h: symbol", o, "is exported as '" official[o] "' in", master
-         else if (official[o] == "")
-            print "png.h: exported symbol", o, "'" symbol[o] "' not present in", master
-         else
-            print "png.h: exported symbol", o, "'" symbol[o] "' exists as '" official[o] "' in", master
-      }
-
-      # Finally generate symbols.new
-      if (symbol[o] != "")
-         print " " symbol[o], "@" o > of
-   }
-
-   if (err != 0) {
-      print "*** A new list is in", of, "***"
-      exit 1
-   }
-}
diff --git a/src/png/libpng/scripts/def.c b/src/png/libpng/scripts/def.c
deleted file mode 100644
index 0ffcbeb0c..000000000
--- a/src/png/libpng/scripts/def.c
+++ /dev/null
@@ -1,29 +0,0 @@
-/* def.c - define format of libpng.def
- *
- * Last changed in libpng version 1.6.16 [December 22, 2014]
- * Copyright (c) 2011-2014 Glenn Randers-Pehrson
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-/* Write the export file header: */
-PNG_DFN ";--------------------------------------------------------------"
-PNG_DFN "; LIBPNG module definition file for OS/2"
-PNG_DFN ";--------------------------------------------------------------"
-PNG_DFN ""
-PNG_DFN "; If you give the library an explicit name one or other files"
-PNG_DFN "; may need modifying to support the new name on one or more"
-PNG_DFN "; systems."
-PNG_DFN "LIBRARY"
-PNG_DFN "OS2 DESCRIPTION "PNG image compression library""
-PNG_DFN "OS2 CODE PRELOAD MOVEABLE DISCARDABLE"
-PNG_DFN ""
-PNG_DFN "EXPORTS"
-PNG_DFN ";Version 1.6.35beta02"
-
-#define PNG_EXPORTA(ordinal, type, name, args, attributes)\
-        PNG_DFN "@" SYMBOL_PREFIX "@@" name "@"
-
-#include "../png.h"
diff --git a/src/png/libpng/scripts/dfn.awk b/src/png/libpng/scripts/dfn.awk
deleted file mode 100644
index 346b9db7d..000000000
--- a/src/png/libpng/scripts/dfn.awk
+++ /dev/null
@@ -1,203 +0,0 @@
-#!/bin/awk -f
-# scripts/dfn.awk - process a .dfn file
-#
-# last changed in libpng version 1.5.19 - August 21, 2014
-#
-# Copyright (c) 2013-2014 Glenn Randers-Pehrson
-#
-# This code is released under the libpng license.
-# For conditions of distribution and use, see the disclaimer
-# and license in png.h
-
-# The output of this script is written to the file given by
-# the variable 'out', which should be set on the command line.
-# Error messages are printed to stdout and if any are printed
-# the script will exit with error code 1.
-
-BEGIN{
-   out="/dev/null"       # as a flag
-   out_count=0           # count of output lines
-   err=0                 # set if an error occurred
-   sort=0                # sort the output
-   array[""]=""
-}
-
-# The output file must be specified before any input:
-NR==1 && out == "/dev/null" {
-   print "out=output.file must be given on the command line"
-   # but continue without setting the error code; this allows the
-   # script to be checked easily
-}
-
-# Output can be sorted; two lines are recognized
-$1 == "PNG_DFN_START_SORT"{
-   sort=0+$2
-   next
-}
-
-$1 ~ /^PNG_DFN_END_SORT/{
-   # Do a very simple, slow, sort; notice that blank lines won't be
-   # output by this
-   for (entry in array) {
-      while (array[entry] != "") {
-         key = entry
-         value = array[key]
-         array[key] = ""
-
-         for (alt in array) {
-            if (array[alt] != "" && alt < key) {
-               array[key] = value
-               value = array[alt]
-               key = alt
-               array[alt] = ""
-            }
-         }
-
-         print value >out
-      }
-   }
-   sort=0
-   next
-}
-
-/^[^"]*PNG_DFN *".*"[^"]*$/{
-   # A definition line, apparently correctly formatted; extract the
-   # definition then replace any doubled "" that remain with a single
-   # double quote.  Notice that the original doubled double quotes
-   # may have been split by tokenization
-   #
-   # Sometimes GCC splits the PNG_DFN lines; we know this has happened
-   # if the quotes aren't closed and must read another line.  In this
-   # case it is essential to reject lines that start with '#' because those
-   # are introduced #line directives.
-   orig=$0
-   line=$0
-   lineno=FNR
-   if (lineno == "") lineno=NR
-
-   if (sub(/^[^"]*PNG_DFN *"/,"",line) != 1) {
-	print "line", lineno ": processing failed:"
-	print orig
-	err=1
-       next
-   } else {
-	++out_count
-   }
-
-   # Now examine quotes within the value:
-   #
-   #   @" - delete this and any following spaces
-   #   "@ - delete this and any preceding spaces
-   #   @' - replace this by a double quote
-   #
-   # This allows macro substitution by the C compiler thus:
-   #
-   #   #define first_name John
-   #   #define last_name Smith
-   #
-   #	PNG_DFN"#define name @'@" first_name "@ @" last_name "@@'"
-   #
-   # Might get C preprocessed to:
-   #
-   #   PNG_DFN "#define foo @'@" John "@ @" Smith "@@'"
-   #
-   # Which this script reduces to:
-   #
-   #	#define name "John Smith"
-   #
-   while (1) {
-      # While there is an @" remove it and the next "@
-      if (line ~ /@"/) {
-         if (line ~ /@".*"@/) {
-            # Do this special case first to avoid swallowing extra spaces
-            # before or after the @ stuff:
-            if (!sub(/@" *"@/, "", line)) {
-               # Ok, do it in pieces - there has to be a non-space between the
-               # two.  NOTE: really weird things happen if a leading @" is
-               # lost - the code will error out below (I believe).
-               if (!sub(/@" */, "", line) || !sub(/ *"@/, "", line)) {
-                  print "line", lineno, ": internal error:", orig
-                  exit 1
-               }
-            }
-         }
-
-         # There is no matching "@.  Assume a split line
-         else while (1) {
-            if (getline nextline) {
-               # If the line starts with '#' it is a preprocesor line directive
-               # from cc -E; skip it:
-               if (nextline !~ /^#/) {
-                  line = line " " nextline
-                  break
-               }
-            } else {
-               # This is end-of-input - probably a missing "@ on the first line:
-               print "line", lineno ": unbalanced @\" ... \"@ pair"
-               err=1
-               next
-            }
-         }
-
-         # Keep going until all the @" have gone
-         continue
-      }
-
-      # Attempt to remove a trailing " (not preceded by '@') - if this can
-      # be done, stop now; if not assume a split line again
-      if (sub(/"[^"]*$/, "", line))
-         break
-
-      # Read another line
-      while (1) {
-         if (getline nextline) {
-            if (nextline !~ /^#/) {
-               line = line " " nextline
-               # Go back to stripping @" "@ pairs
-               break
-            }
-         } else {
-            print "line", lineno ": unterminated PNG_DFN string"
-            err=1
-            next
-         }
-      }
-   }
-
-   # Put any needed double quotes in (at the end, because these would otherwise
-   # interfere with the processing above.)
-   gsub(/@'/,"\"", line)
-
-   # Remove any trailing spaces (not really required, but for
-   # editorial consistency
-   sub(/ *$/, "", line)
-
-   # Remove trailing CR
-   sub(/
$/, "", line)
-
-   if (sort) {
-      if (split(line, parts) < sort) {
-         print "line", lineno ": missing sort field:", line
-         err=1
-      } else
-         array[parts[sort]] = line
-   }
-
-   else
-      print line >out
-   next
-}
-
-/PNG_DFN/{
-   print "line", NR, "incorrectly formatted PNG_DFN line:"
-   print $0
-   err = 1
-}
-
-END{
-   if (out_count > 0 || err > 0)
-	exit err
-
-   print "no definition lines found"
-   exit 1
-}
diff --git a/src/png/libpng/scripts/genchk.cmake.in b/src/png/libpng/scripts/genchk.cmake.in
deleted file mode 100644
index ab3b9d746..000000000
--- a/src/png/libpng/scripts/genchk.cmake.in
+++ /dev/null
@@ -1,37 +0,0 @@
-# genchk.cmake.in
-# Generate .chk from .out with awk (generic), based upon the automake logic.
-
-# Copyright (C) 2016 Glenn Randers-Pehrson
-# Written by Roger Leigh, 2016
-
-# This code is released under the libpng license.
-# For conditions of distribution and use, see the disclaimer
-# and license in png.h
-
-# Variables substituted from CMakeLists.txt
-set(SRCDIR "@CMAKE_CURRENT_SOURCE_DIR@")
-
-set(AWK "@AWK@")
-
-get_filename_component(INPUTEXT "${INPUT}" EXT)
-get_filename_component(OUTPUTEXT "${OUTPUT}" EXT)
-get_filename_component(INPUTBASE "${INPUT}" NAME_WE)
-get_filename_component(OUTPUTBASE "${OUTPUT}" NAME_WE)
-get_filename_component(INPUTDIR "${INPUT}" PATH)
-get_filename_component(OUTPUTDIR "${OUTPUT}" PATH)
-
-if("${INPUTEXT}" STREQUAL ".out" AND "${OUTPUTEXT}" STREQUAL ".chk")
-  # Generate .chk from .out with awk (generic)
-  file(REMOVE "${OUTPUT}" "${OUTPUTDIR}/${OUTPUTBASE}.new")
-  execute_process(COMMAND "${AWK}" -f "${SRCDIR}/scripts/checksym.awk"
-                          "${SRCDIR}/scripts/${INPUTBASE}.def"
-                          "of=${OUTPUTDIR}/${OUTPUTBASE}.new"
-                          "${INPUT}"
-                  RESULT_VARIABLE AWK_FAIL)
-  if(AWK_FAIL)
-    message(FATAL_ERROR "Failed to generate ${OUTPUTDIR}/${OUTPUTBASE}.new")
-  endif()
-  file(RENAME "${OUTPUTDIR}/${OUTPUTBASE}.new" "${OUTPUT}")
-else()
-  message(FATAL_ERROR "Unsupported conversion: ${INPUTEXT} to ${OUTPUTEXT}")
-endif()
diff --git a/src/png/libpng/scripts/genout.cmake.in b/src/png/libpng/scripts/genout.cmake.in
deleted file mode 100644
index 01f12de2f..000000000
--- a/src/png/libpng/scripts/genout.cmake.in
+++ /dev/null
@@ -1,93 +0,0 @@
-# genout.cmake.in
-# Generate .out from .c with awk (generic), based upon the automake logic.
-
-# Copyright (C) 2016 Glenn Randers-Pehrson
-# Written by Roger Leigh, 2016
-
-# This code is released under the libpng license.
-# For conditions of distribution and use, see the disclaimer
-# and license in png.h
-
-# Variables substituted from CMakeLists.txt
-set(SRCDIR "@CMAKE_CURRENT_SOURCE_DIR@")
-set(BINDIR "@CMAKE_CURRENT_BINARY_DIR@")
-
-set(AWK "@AWK@")
-set(CMAKE_C_COMPILER "@CMAKE_C_COMPILER@")
-set(CMAKE_C_FLAGS @CMAKE_C_FLAGS@)
-set(INCDIR "@CMAKE_CURRENT_BINARY_DIR@")
-set(PNG_PREFIX "@PNG_PREFIX@")
-set(PNGLIB_MAJOR "@PNGLIB_MAJOR@")
-set(PNGLIB_MINOR "@PNGLIB_MINOR@")
-set(PNGLIB_VERSION "@PNGLIB_VERSION@")
-set(ZLIBINCDIR "@ZLIB_INCLUDE_DIR@")
-
-set(PLATFORM_C_FLAGS)
-if(APPLE)
-  set(CMAKE_OSX_ARCHITECTURES "@CMAKE_OSX_ARCHITECTURES@")
-  set(CMAKE_OSX_SYSROOT "@CMAKE_OSX_SYSROOT@")
-  if(CMAKE_OSX_ARCHITECTURES)
-    set(PLATFORM_C_FLAGS ${PLATFORM_C_FLAGS} -arch ${CMAKE_OSX_ARCHITECTURES})
-  endif()
-  if(CMAKE_OSX_SYSROOT)
-    set(PLATFORM_C_FLAGS ${PLATFORM_C_FLAGS} -isysroot ${CMAKE_OSX_SYSROOT})
-  endif()
-endif()
-
-get_filename_component(INPUTEXT "${INPUT}" EXT)
-get_filename_component(OUTPUTEXT "${OUTPUT}" EXT)
-get_filename_component(INPUTBASE "${INPUT}" NAME_WE)
-get_filename_component(OUTPUTBASE "${OUTPUT}" NAME_WE)
-get_filename_component(INPUTDIR "${INPUT}" PATH)
-get_filename_component(OUTPUTDIR "${OUTPUT}" PATH)
-
-if ("${INPUTEXT}" STREQUAL ".c" AND "${OUTPUTEXT}" STREQUAL ".out")
-  get_filename_component(GENDIR "${OUTPUT}" PATH)
-  file(MAKE_DIRECTORY "${GENDIR}")
-
-  file(REMOVE "${OUTPUT}.tf1" "${OUTPUT}.tf2")
-
-  set(INCLUDES "-I${INCDIR}")
-  if(ZLIBINCDIR)
-    foreach(dir ${ZLIBINCDIR})
-      list(APPEND INCLUDES "-I${dir}")
-    endforeach()
-  endif()
-
-  if(PNG_PREFIX)
-    set(PNG_PREFIX_DEF "-DPNG_PREFIX=${PNG_PREFIX}")
-  endif()
-
-  execute_process(COMMAND "${CMAKE_C_COMPILER}" "-E"
-                          ${CMAKE_C_FLAGS}
-                          ${PLATFORM_C_FLAGS}
-                          "-I${SRCDIR}"
-                          "-I${BINDIR}"
-                          ${INCLUDES}
-                          "-DPNGLIB_LIBNAME=PNG${PNGLIB_MAJOR}${PNGLIB_MINOR}_0"
-                          "-DPNGLIB_VERSION=${PNGLIB_VERSION}"
-                          "-DSYMBOL_PREFIX=${SYMBOL_PREFIX}"
-                          "-DPNG_NO_USE_READ_MACROS"
-                          "-DPNG_BUILDING_SYMBOL_TABLE"
-                          ${PNG_PREFIX_DEF}
-                          "${INPUT}"
-                  OUTPUT_FILE "${OUTPUT}.tf1"
-                  WORKING_DIRECTORY "${BINDIR}"
-                  RESULT_VARIABLE CPP_FAIL)
-  if(CPP_FAIL)
-    message(FATAL_ERROR "Failed to generate ${OUTPUT}.tf1")
-  endif()
-
-  execute_process(COMMAND "${AWK}" -f "${SRCDIR}/scripts/dfn.awk"
-                          "out=${OUTPUT}.tf2" "${OUTPUT}.tf1"
-                  WORKING_DIRECTORY "${BINDIR}"
-                  RESULT_VARIABLE AWK_FAIL)
-  if(AWK_FAIL)
-    message(FATAL_ERROR "Failed to generate ${OUTPUT}.tf2")
-  endif()
-
-  file(REMOVE "${OUTPUT}.tf1")
-  file(RENAME "${OUTPUT}.tf2" "${OUTPUT}")
-else()
-  message(FATAL_ERROR "Unsupported conversion: ${INPUTEXT} to ${OUTPUTEXT}")
-endif()
diff --git a/src/png/libpng/scripts/gensrc.cmake.in b/src/png/libpng/scripts/gensrc.cmake.in
deleted file mode 100644
index f28a62266..000000000
--- a/src/png/libpng/scripts/gensrc.cmake.in
+++ /dev/null
@@ -1,138 +0,0 @@
-# gensrc.cmake.in
-# Generate source files with awk, based upon the automake logic.
-
-# Copyright (C) 2016 Glenn Randers-Pehrson
-# Written by Roger Leigh, 2016
-
-# This code is released under the libpng license.
-# For conditions of distribution and use, see the disclaimer
-# and license in png.h
-
-# Variables substituted from CMakeLists.txt
-set(SRCDIR "@CMAKE_CURRENT_SOURCE_DIR@")
-set(BINDIR "@CMAKE_CURRENT_BINARY_DIR@")
-
-set(AWK "@AWK@")
-set(DFA_XTRA "@DFA_XTRA@")
-set(PNG_PREFIX "@PNG_PREFIX@")
-set(PNGLIB_VERSION "@PNGLIB_VERSION@")
-
-if("${OUTPUT}" STREQUAL "scripts/pnglibconf.c")
-  # Generate scripts/pnglibconf.c
-
-  file(REMOVE "${BINDIR}/pnglibconf.tf6" "${BINDIR}/pnglibconf.tf7")
-
-  execute_process(COMMAND "${CMAKE_COMMAND}" -E echo "com ${PNGLIB_VERSION} STANDARD API DEFINITION"
-                  COMMAND "${AWK}" -f "${SRCDIR}/scripts/options.awk"
-                          "out=pnglibconf.tf6" "logunsupported=1" "version=search"
-                          "${SRCDIR}/pngconf.h" "-"
-                          "${SRCDIR}/scripts/pnglibconf.dfa"
-                  WORKING_DIRECTORY "${BINDIR}"
-                  RESULT_VARIABLE AWK_FAIL)
-  if(AWK_FAIL)
-    message(FATAL_ERROR "Failed to generate pnglibconf.tf6")
-  endif()
-
-  execute_process(COMMAND "${AWK}" -f "${SRCDIR}/scripts/options.awk"
-                  "out=pnglibconf.tf7" "pnglibconf.tf6"
-                  WORKING_DIRECTORY "${BINDIR}"
-                  RESULT_VARIABLE AWK_FAIL)
-  if(AWK_FAIL)
-    message(FATAL_ERROR "Failed to generate pnglibconf.tf7")
-  endif()
-
-  file(REMOVE "pnglibconf.tf6")
-  file(MAKE_DIRECTORY "${BINDIR}/scripts")
-  file(RENAME "pnglibconf.tf7" "${BINDIR}/scripts/pnglibconf.c")
-
-elseif ("${OUTPUT}" STREQUAL "pnglibconf.c")
-  # Generate pnglibconf.c
-
-  file(REMOVE "${BINDIR}/pnglibconf.tf4" "${BINDIR}/pnglibconf.tf5")
-
-  execute_process(COMMAND "${AWK}" -f "${SRCDIR}/scripts/options.awk"
-                  out=pnglibconf.tf4 version=search
-                  ${SRCDIR}/pngconf.h ${SRCDIR}/scripts/pnglibconf.dfa
-                  ${SRCDIR}/pngusr.dfa ${DFA_XTRA}
-                  WORKING_DIRECTORY "${BINDIR}"
-                  RESULT_VARIABLE AWK_FAIL)
-  if(AWK_FAIL)
-    message(FATAL_ERROR "Failed to generate pnglibconf.tf4")
-  endif()
-
-  execute_process(COMMAND "${AWK}" -f "${SRCDIR}/scripts/options.awk"
-                  out=pnglibconf.tf5 pnglibconf.tf4
-                  WORKING_DIRECTORY "${BINDIR}"
-                  RESULT_VARIABLE AWK_FAIL)
-  if(AWK_FAIL)
-    message(FATAL_ERROR "Failed to generate pnglibconf.tf5")
-  endif()
-
-  file(REMOVE "pnglibconf.tf4")
-  file(MAKE_DIRECTORY "${BINDIR}/scripts")
-  file(RENAME "pnglibconf.tf5" "${BINDIR}/pnglibconf.c")
-
-elseif ("${OUTPUT}" STREQUAL "pnglibconf.h")
-  # Generate pnglibconf.h
-
-  file(REMOVE "${BINDIR}/${OUTPUT}")
-  if(PNG_PREFIX)
-    file(REMOVE "pnglibconf.tf8")
-
-    execute_process(COMMAND "${AWK}" "s==0 && NR>1{print prev}
-                             s==0{prev=\$0}
-                             s==1{print \"#define\", \$1, \"${PNG_PREFIX}\" \$1}
-                             s==2{print \"#define ${PNG_PREFIX}png_\" \$1, \"PNG_\" \$1}
-                             END{print prev}" s=0 pnglibconf.out s=1 "${BINDIR}/scripts/prefix.out"
-                             s=2 "${SRCDIR}/scripts/macro.lst"
-                    OUTPUT_FILE pnglibconf.tf8
-                    RESULT_VARIABLE AWK_FAIL)
-    if(AWK_FAIL)
-      message(FATAL_ERROR "Failed to generate pnglibconf.tf8")
-    endif()
-
-    file(RENAME "pnglibconf.tf8" "${BINDIR}/${OUTPUT}")
-  else()
-    execute_process(COMMAND "${CMAKE_COMMAND}" -E copy "${BINDIR}/pnglibconf.out"
-                                                       "${BINDIR}/${OUTPUT}"
-                    RESULT_VARIABLE COPY_FAIL)
-    if(COPY_FAIL)
-      message(FATAL_ERROR "Failed to create pnglibconf.h")
-    endif()
-  endif()
-
-elseif ("${OUTPUT}" STREQUAL "pngprefix.h")
-  # Generate pngprefix.h
-
-  file(REMOVE "${BINDIR}/${OUTPUT}")
-
-  if(PNG_PREFIX)
-    file(REMOVE "pngprefix.tf1")
-
-    execute_process(COMMAND "${AWK}"
-                            "{print \"#define\", \$1, \"${PNG_PREFIX}\" \$1}"
-                            "${BINDIR}/scripts/intprefix.out"
-                    OUTPUT_FILE "pngprefix.tf1"
-                    RESULT_VARIABLE AWK_FAIL)
-    if(AWK_FAIL)
-      message(FATAL_ERROR "Failed to generate pngprefix.tf1")
-    endif()
-
-    file(RENAME "pngprefix.tf1" "${BINDIR}/${OUTPUT}")
-  else()
-    file(WRITE "${BINDIR}/${OUTPUT}" "/* No libpng symbol prefix configured. */")
-  endif()
-
-elseif("${OUTPUT}" STREQUAL "scripts/pnglibconf.h.prebuilt")
-  # Generate scripts/pnglibconf.h.prebuilt (fails build)
-
-  message(STATUS "Attempting to build scripts/pnglibconf.h.prebuilt")
-  message(STATUS "This is a machine generated file, but if you want to make")
-  message(STATUS "a new one simply build the 'genfiles' target, and copy")
-  message(STATUS "scripts/pnglibconf.out to scripts/pnglibconf.h.prebuilt")
-  message(STATUS "AND set PNG_ZLIB_VERNUM to 0 (you MUST do this)")
-  message(FATAL_ERROR "Stopping build")
-
-else()
-  message(FATAL_ERROR "Unsupported output: ${OUTPUT}")
-endif()
diff --git a/src/png/libpng/scripts/intprefix.c b/src/png/libpng/scripts/intprefix.c
deleted file mode 100644
index 254f8e94b..000000000
--- a/src/png/libpng/scripts/intprefix.c
+++ /dev/null
@@ -1,22 +0,0 @@
-
-/* intprefix.c - generate an unprefixed internal symbol list
- *
- * Last changed in libpng version 1.6.16 [December 22, 2014]
- * Copyright (c) 2013-2014 Glenn Randers-Pehrson
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#define PNG_INTERNAL_DATA(type, name, array)\
-        PNG_DFN "@" name "@"
-
-#define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
-        PNG_DFN "@" name "@"
-
-#define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
-        PNG_DFN "@" name "@"
-
-#define PNGPREFIX_H /* self generation */
-#include "../pngpriv.h"
diff --git a/src/png/libpng/scripts/libpng-config-body.in b/src/png/libpng/scripts/libpng-config-body.in
deleted file mode 100644
index b466432d5..000000000
--- a/src/png/libpng/scripts/libpng-config-body.in
+++ /dev/null
@@ -1,96 +0,0 @@
-
-usage()
-{
-    cat <<EOF
-Usage: libpng-config [OPTION] ...
-
-Known values for OPTION are:
-
-  --prefix        print libpng prefix
-  --libdir        print path to directory containing library
-  --libs          print library linking information
-  --ccopts        print compiler options
-  --cppflags      print pre-processor flags
-  --cflags        print preprocessor flags, I_opts, and compiler options
-  --I_opts        print "-I" include options
-  --L_opts        print linker "-L" flags for dynamic linking
-  --R_opts        print dynamic linker "-R" or "-rpath" flags
-  --ldopts        print linker options
-  --ldflags       print linker flags (ldopts, L_opts, R_opts, and libs)
-  --static        revise subsequent outputs for static linking
-  --help          print this help and exit
-  --version       print version information
-EOF
-
-    exit $1
-}
-
-if test $# -eq 0; then
-    usage 1
-fi
-
-while test $# -gt 0; do
-    case "$1" in
-
-    --prefix)
-        echo ${prefix}
-        ;;
-
-    --version)
-        echo ${version}
-        exit 0
-        ;;
-
-    --help)
-        usage 0
-        ;;
-
-    --ccopts)
-        echo ${ccopts}
-        ;;
-
-    --cppflags)
-        echo ${cppflags}
-        ;;
-
-    --cflags)
-        echo ${I_opts} ${cppflags} ${ccopts}
-        ;;
-
-    --libdir)
-        echo ${libdir}
-        ;;
-
-    --libs)
-        echo ${libs}
-        ;;
-
-    --I_opts)
-        echo ${I_opts}
-        ;;
-
-    --L_opts)
-        echo ${L_opts}
-        ;;
-
-    --R_opts)
-        echo ${R_opts}
-        ;;
-
-    --ldflags)
-        echo ${ldflags} ${L_opts} ${R_opts} ${libs}
-        ;;
-
-    --static)
-        R_opts=""
-        ;;
-
-    *)
-        usage
-        exit 1
-        ;;
-    esac
-    shift
-done
-
-exit 0
diff --git a/src/png/libpng/scripts/libpng-config-head.in b/src/png/libpng/scripts/libpng-config-head.in
deleted file mode 100644
index 64dd3987d..000000000
--- a/src/png/libpng/scripts/libpng-config-head.in
+++ /dev/null
@@ -1,24 +0,0 @@
-#! /bin/sh
-
-# libpng-config
-# provides configuration info for libpng.
-
-# Copyright (C) 2002 Glenn Randers-Pehrson
-
-# This code is released under the libpng license.
-# For conditions of distribution and use, see the disclaimer
-# and license in png.h
-
-# Modeled after libxml-config.
-
-version=1.6.34
-prefix=""
-libdir=""
-libs=""
-I_opts=""
-L_opts=""
-R_opts=""
-cppflags=""
-ccopts=""
-ldopts=""
-
diff --git a/src/png/libpng/scripts/libpng.pc.in b/src/png/libpng/scripts/libpng.pc.in
deleted file mode 100644
index 33c65767b..000000000
--- a/src/png/libpng/scripts/libpng.pc.in
+++ /dev/null
@@ -1,10 +0,0 @@
-prefix=@prefix@
-exec_prefix=@exec_prefix@
-libdir=@libdir@
-includedir=@includedir@/libpng16
-
-Name: libpng
-Description: Loads and saves PNG files
-Version: 1.6.34
-Libs: -L${libdir} -lpng16
-Cflags: -I${includedir}
diff --git a/src/png/libpng/scripts/options.awk b/src/png/libpng/scripts/options.awk
deleted file mode 100644
index fef5dfd78..000000000
--- a/src/png/libpng/scripts/options.awk
+++ /dev/null
@@ -1,898 +0,0 @@
-#!/bin/awk -f
-# scripts/options.awk - library build configuration control
-#
-# last changed in libpng version 1.6.11 - June 5, 2014
-#
-# Copyright (c) 1998-2014 Glenn Randers-Pehrson
-#
-# This code is released under the libpng license.
-# For conditions of distribution and use, see the disclaimer
-# and license in png.h
-
-# The output of this script is written to the file given by
-# the variable 'out'.  The script is run twice, once with
-# an intermediate output file, 'options.tmp' then again on
-# that file to produce the final output:
-#
-#  awk -f scripts/options.awk out=options.tmp scripts/options.dfa 1>&2
-#  awk -f scripts/options.awk out=options.dfn options.tmp 1>&2
-#
-# Some options may be specified on the command line:
-#
-#  deb=1            Causes debugging to be output
-#  logunsupported=1 Causes all options to be recorded in the output
-#  everything=off   Causes all options to be disabled by default
-#  everything=on    Causes all options to be enabled by default
-#
-# If awk fails on your platform, try nawk instead.
-#
-# These options may also be specified in the original input file (and
-# are copied to the preprocessed file).
-
-BEGIN{
-   out=""                       # intermediate, preprocessed, file
-   pre=-1                       # preprocess (first line)
-   version="libpng version unknown" # version information
-   version_file=""              # where to find the version
-   err=0                        # in-line exit sets this
-   # The following definitions prevent the C preprocessor noticing the lines
-   # that will be in the final output file.  Some C preprocessors tokenise
-   # the lines, for example by inserting spaces around operators, and all
-   # C preprocessors notice lines that start with '#', most remove comments.
-   # The technique adopted here is to make the final output lines into
-   # C strings (enclosed in double quotes), preceded by PNG_DFN.  As a
-   # consequence the output cannot contain a 'raw' double quote - instead put
-   # @' in, this will be replaced by a single " afterward.  See the parser
-   # script dfn.awk for more capabilities (not required here).  Note that if
-   # you need a " in a 'setting' in pnglibconf.dfa it must also be @'!
-   dq="@'"                      # For a single double quote
-   start=" PNG_DFN \""          # Start stuff to output (can't contain a "!)
-   end="\" "                    # End stuff to output
-   subs="@\" "                  # Substitute start (substitute a C macro)
-   sube=" \"@"                  # Substitute end
-   comment=start "/*"           # Comment start
-   cend="*/" end                # Comment end
-   def=start "#define PNG_"     # Arbitrary define
-   sup="_SUPPORTED" end         # end supported option
-   und=comment "#undef PNG_"    # Unsupported option
-   une="_SUPPORTED" cend        # end unsupported option
-   error=start "ERROR:"         # error message, terminate with 'end'
-
-   # Variables
-   deb=0                        # debug - set on command line
-   everything=""                # do not override defaults
-   logunsupported=0             # write unsupported options too
-
-   # Precreate arrays
-   # for each option:
-   option[""] = ""    # list of all options: default enabled/disabled
-   done[""] = 1       # marks option as having been output
-   requires[""] = ""  # requires by option
-   iffs[""] = ""      # if by option
-   enabledby[""] = "" # options that enable it by option
-   sets[""] = ""      # settings set by each option
-   setval[""] = ""    # value to set (indexed: 'option sets[option]')
-   # for each setting:
-   setting[""] = ""   # requires by setting
-   defaults[""] = ""  # used for a defaulted value
-   doneset[""] = 1    # marks setting as having been output
-   r[""] = ""         # Temporary array
-
-   # For decorating the output file
-   protect = ""
-}
-
-# The output file must be specified before any input:
-out == "" {
-   print "out=output.file must be given on the command line"
-   err = 1
-   exit 1
-}
-
-# The very first line indicates whether we are reading pre-processed
-# input or not, this must come *first* because 'PREPROCESSED' needs
-# to be the very first line in the temporary file.
-pre == -1{
-   if ($0 == "PREPROCESSED") {
-      pre = 0
-      next
-   } else {
-      pre = 1
-      print "PREPROCESSED" >out
-      # And fall through to continue processing
-   }
-}
-
-# While pre-processing if version is set to "search" look for a version string
-# in the following file.
-pre && version == "search" && version_file == ""{
-   version_file = FILENAME
-}
-
-pre && version == "search" && version_file != FILENAME{
-   print "version string not found in", version_file
-   err = 1
-   exit 1
-}
-
-pre && version == "search" && $0 ~ /^ \* libpng version/{
-   version = substr($0, 4)
-   print "version =", version >out
-   next
-}
-
-pre && FILENAME == version_file{
-   next
-}
-
-# variable=value
-#   Sets the given variable to the given value (the syntax is fairly
-#   free form, except for deb (you are expected to understand how to
-#   set the debug variable...)
-#
-#   This happens before the check on 'pre' below skips most of the
-#   rest of the actions, so the variable settings happen during
-#   preprocessing but are recorded in the END action too.  This
-#   allows them to be set on the command line too.
-$0 ~ /^[ 	]*version[ 	]*=/{
-   sub(/^[  ]*version[  ]*=[  ]*/, "")
-   version = $0
-   next
-}
-$0 ~ /^[ 	]*everything[ 	=]*off[ 	]*$/{
-   everything = "off"
-   next
-}
-$0 ~ /^[ 	]*everything[ 	=]*on[ 	]*$/{
-   everything = "on"
-   next
-}
-$0 ~ /^[ 	]*logunsupported[ 	=]*0[ 	]*$/{
-   logunsupported = 0
-   next
-}
-$0 ~ /^[ 	]*logunsupported[ 	=]*1[ 	]*$/{
-   logunsupported = 1
-   next
-}
-$1 == "deb" && $2 == "=" && NF == 3{
-   deb = $3
-   next
-}
-
-# Preprocessing - this just copies the input file with lines
-# that need preprocessing (just chunk at present) expanded
-# The bare "pre" instead of "pre != 0" crashes under Sunos awk
-pre && $1 != "chunk"{
-   print >out
-   next
-}
-
-# The first characters of the line determine how it is processed,
-# leading spaces are ignored.  In general tokens that are not
-# keywords are the names of options.  An option 'name' is
-# controlled by the definition of the corresponding macros:
-#
-#   PNG_name_SUPPORTED    The option is turned on
-#   PNG_NO_name
-#   PNG_NO_name_SUPPORTED If the first macro is not defined
-#                         either of these will turn the option off
-#
-# If none of these macros are defined the option is turned on, unless
-# the keyword 'off' is given in a line relating to the option.  The
-# keyword 'on' can also be given, but it will be ignored (since it is
-# the default.)
-#
-# In the syntax below a 'name' is indicated by "NAME", other macro
-# values are indicated by "MACRO", as with "NAME" the leading "PNG_"
-# is omitted, but in this case the "NO_" prefix and the "_SUPPORTED"
-# suffix are never used.
-#
-# Each line is introduced by a keyword - the first non-space characters
-# on the line.  A line starting with a '#' is a comment - it is totally
-# ignored.  Keywords are as follows, a NAME, is simply a macro name
-# without the leading PNG_, PNG_NO_ or the trailing _SUPPORTED.
-
-$1 ~ /^#/ || $0 ~ /^[ 	]*$/{
-   next
-}
-
-# com <comment>
-#   The whole line is placed in the output file as a comment with
-#   the preceding 'com' removed
-$1 == "com"{
-   if (NF > 1) {
-      # sub(/^[ 	]*com[ 	]*/, "")
-      $1 = ""
-      print comment $0, cend >out
-   } else
-      print start end >out
-   next
-}
-
-# version
-#   Inserts a version comment
-$1 == "version" && NF == 1{
-   if (version == "") {
-      print "ERROR: no version string set"
-      err = 1 # prevent END{} running
-      exit 1
-   }
-
-   print comment, version, cend >out
-   next
-}
-
-# file output input protect
-#   Informational: the official name of the input file (without
-#   make generated local directories), the official name of the
-#   output file and, if required, a name to use in a protection
-#   macro for the contents.
-$1 == "file" && NF >= 2{
-   print comment, $2, cend >out
-   print comment, "Machine generated file: DO NOT EDIT", cend >out
-   if (NF >= 3)
-      print comment, "Derived from:", $3, cend >out
-   protect = $4
-   if (protect != "") {
-      print start "#ifndef", protect end >out
-      print start "#define", protect end >out
-   }
-   next
-}
-
-# option NAME ( (requires|enables|if) NAME* | on | off | disabled |
-#                sets SETTING VALUE+ )*
-#     
-#   Declares an option 'NAME' and describes its default setting (disabled)
-#   and its relationship to other options.  The option is disabled
-#   unless *all* the options listed after 'requires' are set and at
-#   least one of the options listed after 'if' is set.  If the
-#   option is set then it turns on all the options listed after 'enables'.
-#
-#   Note that "enables" takes priority over the required/if/disabled/off
-#   setting of the target option.
-#
-#   The definition file may list an option as 'disabled': off by default,
-#   otherwise the option is enabled: on by default.  A later (and it must
-#   be later) entry may turn an option on or off explicitly.
-
-$1 == "option" && NF >= 2{
-   opt = $2
-   sub(/,$/,"",opt)
-   onoff = option[opt]  # records current (and the default is "", enabled)
-   key = ""
-   istart = 3
-   do {
-      if (istart == 1) {     # continuation line
-         val = getline
-
-         if (val != 1) { # error reading it
-            if (val == 0)
-               print "option", opt ": ERROR: missing continuation line"
-            else
-               print "option", opt ": ERROR: error reading continuation line"
-
-            # This is a hard error
-            err = 1 # prevent END{} running
-            exit 1
-         }
-      }
-
-      for (i=istart; i<=NF; ++i) {
-         val=$(i)
-         sub(/,$/,"",val)
-         if (val == "on" || val == "off" || val == "disabled" || val =="enabled") {
-            key = ""
-            if (onoff != val) {
-               # on or off can zap disabled or enabled:
-               if (onoff == "" || (onoff == "disabled" || onoff == "enabled") &&
-                   (val == "on" || val == "off")) {
-                  # It's easy to mis-spell the option when turning it
-                  # on or off, so warn about it here:
-                  if (onoff == "" && (val == "on" || val == "off")) {
-                     print "option", opt ": ERROR: turning unrecognized option", val
-                     # For the moment error out - it is safer
-                     err = 1 # prevent END{} running
-                     exit 1
-                  }
-                  onoff = val
-               } else {
-                  # Print a message, otherwise the error
-                  # below is incomprehensible
-                  print "option", opt ": currently", onoff ": attempt to turn", val
-                  break
-               }
-            }
-         } else if (val == "requires" || val == "if" || val == "enables" || val =="sets") {
-            key = val
-         } else if (key == "requires") {
-            requires[opt] = requires[opt] " " val
-         } else if (key == "if") {
-            iffs[opt] = iffs[opt] " " val
-         } else if (key == "enables") {
-            enabledby[val] = enabledby[val] " " opt
-         } else if (key == "sets") {
-            sets[opt] = sets[opt] " " val
-            key = "setval"
-            set = val
-         } else if (key == "setval") {
-            setval[opt " " set] = setval[opt " " set] " " val
-         } else
-            break # bad line format
-      }
-
-      istart = 1
-   } while (i > NF && $0 ~ /,$/)
-
-   if (i > NF) {
-      # Set the option, defaulting to 'enabled'
-      if (onoff == "") onoff = "enabled"
-      option[opt] = onoff
-      next
-   }
-   # Else fall through to the error handler
-}
-
-# chunk NAME [requires OPT] [enables LIST] [on|off|disabled]
-#   Expands to the 'option' settings appropriate to the reading and
-#   writing of an ancillary PNG chunk 'NAME':
-#
-#   option READ_NAME requires READ_ANCILLARY_CHUNKS [READ_OPT]
-#   option READ_NAME enables NAME LIST
-#   [option READ_NAME off]
-#   option WRITE_NAME requires WRITE_ANCILLARY_CHUNKS [WRITE_OPT]
-#   option WRITE_NAME enables NAME LIST
-#   [option WRITE_NAME off]
-
-pre != 0 && $1 == "chunk" && NF >= 2{
-   # 'chunk' is handled on the first pass by writing appropriate
-   # 'option' lines into the intermediate file.
-   opt = $2
-   sub(/,$/,"",opt)
-   onoff = ""
-   reqread = ""
-   reqwrite = ""
-   enables = ""
-   req = 0
-   istart = 3
-   do {
-      if (istart == 1) {     # continuation line
-         val = getline
-
-         if (val != 1) { # error reading it
-            if (val == 0)
-               print "chunk", opt ": ERROR: missing continuation line"
-            else
-               print "chunk", opt ": ERROR: error reading continuation line"
-
-            # This is a hard error
-            err = 1 # prevent END{} running
-            exit 1
-         }
-      }
-
-      # read the keywords/additional OPTS
-      for (i=istart; i<=NF; ++i) {
-         val = $(i)
-         sub(/,$/,"",val)
-         if (val == "on" || val == "off" || val == "disabled") {
-            if (onoff != val) {
-               if (onoff == "")
-                  onoff = val
-               else
-                  break # on/off conflict
-            }
-            req = 0
-         } else if (val == "requires")
-            req = 1
-         else if (val == "enables")
-            req = 2
-         else if (req == 1){
-            reqread = reqread " READ_" val
-            reqwrite = reqwrite " WRITE_" val
-         } else if (req == 2)
-            enables = enables " " val
-         else
-            break # bad line: handled below
-      }
-
-      istart = 1
-   } while (i > NF && $0 ~ /,$/)
-
-   if (i > NF) {
-      # Output new 'option' lines to the intermediate file (out)
-      print "option READ_" opt, "requires READ_ANCILLARY_CHUNKS" reqread, "enables", opt enables , onoff >out
-      print "option WRITE_" opt, "requires WRITE_ANCILLARY_CHUNKS" reqwrite, "enables", opt enables, onoff >out
-      next
-   }
-   # Else hit the error handler below - bad line format!
-}
-
-# setting MACRO ( requires MACRO* )* [ default VALUE ]
-#   Behaves in a similar way to 'option' without looking for NO_ or
-#   _SUPPORTED; the macro is enabled if it is defined so long as all
-#   the 'requires' macros are also defined.  The definitions may be
-#   empty, an error will be issued if the 'requires' macros are
-#   *not* defined.  If given the 'default' value is used if the
-#   macro is not defined.  The default value will be re-tokenised.
-#   (BTW: this is somewhat restrictive, it mainly exists for the
-#   support of non-standard configurations and numeric parameters,
-#   see the uses in scripts/options.dat
-
-$1 == "setting" && (NF == 2 || NF >= 3 && ($3 == "requires" || $3 == "default")){
-   reqs = ""
-   deflt = ""
-   isdef = 0
-   key = ""
-   for (i=3; i<=NF; ++i)
-      if ($(i) == "requires" || $(i) == "default") {
-         key = $(i)
-         if (key == "default") isdef = 1
-      } else if (key == "requires")
-         reqs = reqs " " $(i)
-      else if (key == "default")
-         deflt = deflt " " $(i)
-      else
-         break # Format error, handled below
-
-   setting[$2] = reqs
-   # NOTE: this overwrites a previous value silently
-   if (isdef && deflt == "")
-      deflt = " " # as a flag to force output
-   defaults[$2] = deflt
-   next
-}
-
-# The order of the dependency lines (option, chunk, setting) is irrelevant
-# - the 'enables', 'requires' and 'if' settings will be used to determine
-# the correct order in the output and the final values in pnglibconf.h are
-# not order dependent.  'requires' and 'if' entries take precedence over
-# 'enables' from other options; if an option requires another option it
-# won't be set regardless of any options that enable it unless the other
-# option is also enabled.
-#
-# Similarly 'enables' trumps a NO_ definition in CFLAGS or pngusr.h
-#
-# For simplicity cycles in the definitions are regarded as errors,
-# even if they are not ambiguous.
-# A given NAME can be specified in as many 'option' lines as required, the
-# definitions are additive.
-
-# For backwards compatibility equivalent macros may be listed thus:
-#
-# = [NO_]NAME MACRO
-#   Makes -DMACRO equivalent to -DPNG_NO_NAME or -DPNG_NAME_SUPPORTED
-#   as appropriate.
-#
-# The definition is injected into the C compiler input when encountered
-# in the second pass (so all these definitions appear *after* the @
-# lines!)
-#
-# 'NAME' is as above, but 'MACRO' is the full text of the equivalent
-# old, deprecated, macro.
-
-$1 == "=" && NF == 3{
-   print "#ifdef PNG_" $3 >out
-   if ($2 ~ /^NO_/)
-      print "#   define PNG_" $2 >out
-   else
-      print "#   define PNG_" $2 "_SUPPORTED" >out
-   print "#endif" >out
-   next
-}
-
-# Lines may be injected into the C compiler input by preceding them
-# with an "@" character.  The line is copied with just the leading
-# @ removed.
-
-$1 ~ /^@/{
-   # sub(/^[ 	]*@/, "")
-   $1 = substr($1, 2)
-   print >out
-   next
-}
-
-# Check for unrecognized lines, because of the preprocessing chunk
-# format errors will be detected on the first pass independent of
-# any other format errors.
-{
-   print "options.awk: bad line (" NR "):", $0
-   err = 1 # prevent END{} running
-   exit 1
-}
-
-# For checking purposes names that start with "ok_" or "fail_" are
-# not output to pnglibconf.h and must be either enabled or disabled
-# respectively for the build to succeed.  This allows interdependencies
-# between options of the form "at least one of" or "at most one of"
-# to be checked.  For example:
-#
-# option FLOATING_POINT enables ok_math
-# option FIXED_POINT enables ok_math
-#   This ensures that at least one of FLOATING_POINT and FIXED_POINT
-#   must be set for the build to succeed.
-#
-# option fail_math requires FLOATING_POINT FIXED_POINT
-#   This means the build will fail if *both* FLOATING_POINT and
-#   FIXED_POINT are set (this is an example; in fact both are allowed.)
-#
-# If all these options were given the build would require exactly one
-# of the names to be enabled.
-
-END{
-   # END{} gets run on an exit (a traditional awk feature)
-   if (err) exit 1
-
-   if (pre) {
-      # Record the final value of the variables
-      print "deb =", deb >out
-      if (everything != "") {
-         print "everything =", everything >out
-      }
-      print "logunsupported =", logunsupported >out
-      exit 0
-   }
-
-   # Do the options first (allowing options to set settings).  The dependency
-   # tree is thus:
-   #
-   #   name     >     name
-   #   name requires  name
-   #   name if        name
-   #   name enabledby name
-   #
-   # First build a list 'tree' by option of all the things on which
-   # it depends.
-   print "" >out
-   print "/* OPTIONS */" >out
-   print comment, "options", cend >out
-   for (opt in enabledby) tree[opt] = 1  # may not be explicit options
-   for (opt in option) if (opt != "") {
-      o = option[opt]
-      # option should always be one of the following values
-      if (o != "on" && o != "off" && o != "disabled" && o != "enabled") {
-         print "internal option error (" o ")"
-         exit 1
-      }
-      tree[opt] = ""   # so unlisted options marked
-   }
-   for (opt in tree) if (opt != "") {
-      if (tree[opt] == 1) {
-         tree[opt] = ""
-         if (option[opt] != "") {
-            print "internal error (1)"
-            exit 1
-         }
-         # Macros only listed in 'enables' remain off unless
-         # one of the enabling macros is on.
-         option[opt] = "disabled"
-      }
-
-      split("", list) # clear 'list'
-      # Now add every requires, iffs or enabledby entry to 'list'
-      # so that we can add a unique list of requirements to tree[i]
-      split(requires[opt] iffs[opt] enabledby[opt], r)
-      for (i in r) list[r[i]] = 1
-      for (i in list) tree[opt] = tree[opt] " " i
-   }
-
-   # print the tree for extreme debugging
-   if (deb > 2) for (i in tree) if (i != "") print i, "depends-on" tree[i]
-
-   # Ok, now check all options marked explicitly 'on' or 'off':
-   #
-   # If an option[opt] is 'on' then turn on all requires[opt]
-   # If an option[opt] is 'off' then turn off all enabledby[opt]
-   #
-   # Error out if we have to turn 'on' to an 'off' option or vice versa.
-   npending = 0
-   for (opt in option) if (opt != "") {
-      if (option[opt] == "on" || option[opt] == "off") {
-         pending[++npending] = opt
-      }
-   }
-
-   err = 0 # set on error
-   while (npending > 0) {
-      opt = pending[npending--]
-      if (option[opt] == "on") {
-         nreqs = split(requires[opt], r)
-         for (j=1; j<=nreqs; ++j) {
-            if (option[r[j]] == "off") {
-               print "option", opt, "turned on, but requirement", r[j], "is turned off"
-               err = 1
-            } else if (option[r[j]] != "on") {
-               option[r[j]] = "on"
-               pending[++npending] = r[j]
-            }
-         }
-      } else {
-         if (option[opt] != "off") {
-            print "internal error (2)"
-            exit 1
-         }
-         nreqs = split(enabledby[opt], r)
-         for (j=1; j<=nreqs; ++j) {
-            if (option[r[j]] == "on") {
-               print "option", opt, "turned off, but enabled by", r[j], "which is turned on"
-               err = 1
-            } else if (option[r[j]] != "off") {
-               option[r[j]] = "off"
-               pending[++npending] = r[j]
-            }
-         }
-      }
-   }
-   if (err) exit 1
-
-   # Sort options:
-   print "PNG_DFN_START_SORT 2" >out
-
-   # option[i] is now the complete list of all the tokens we may
-   # need to output, go through it as above, depth first.
-   finished = 0
-   while (!finished) {
-      finished = 1
-      movement = 0 # done nothing
-      for (i in option) if (!done[i]) {
-         nreqs = split(tree[i], r)
-         if (nreqs > 0) {
-            for (j=1; j<=nreqs; ++j) if (!done[r[j]]) {
-               break
-            }
-            if (j<=nreqs) {
-               finished = 0
-               continue  # next option
-            }
-         }
-
-         # All the requirements have been processed, output
-         # this option.  An option is _SUPPORTED if:
-         #
-         # all 'requires' are _SUPPORTED AND
-         # at least one of the 'if' options are _SUPPORTED AND
-         # EITHER:
-         #   The name is _SUPPORTED (on the command line)
-         # OR:
-         #   an 'enabledby' is _SUPPORTED
-         # OR:
-         #   NO_name is not defined AND
-         #   the option is not disabled; an option is disabled if:
-         #    option == off
-         #    option == disabled && everything != on
-         #    option == "" && everything == off
-         if (deb) print "option", i
-         print "" >out
-         print "/* option:", i, option[i] >out
-         print " *   requires:  " requires[i] >out
-         print " *   if:        " iffs[i] >out
-         print " *   enabled-by:" enabledby[i] >out
-         print " *   sets:      " sets[i], "*/" >out
-         print "#undef PNG_on" >out
-         print "#define PNG_on 1" >out
-
-         # requires
-         nreqs = split(requires[i], r)
-         for (j=1; j<=nreqs; ++j) {
-            print "#ifndef PNG_" r[j] "_SUPPORTED" >out
-            print "#   undef PNG_on /*!" r[j] "*/" >out
-            # This error appears in the final output if something
-            # was switched 'on' but the processing above to force
-            # the requires did not work
-            if (option[i] == "on") {
-               print error, i, "requires", r[j] end >out
-            }
-            print "#endif" >out
-         }
-
-         # if
-         have_ifs = 0
-         nreqs = split(iffs[i], r)
-         print "#undef PNG_no_if" >out
-         if (nreqs > 0) {
-            have_ifs = 1
-            print "/* if" iffs[i], "*/" >out
-            print "#define PNG_no_if 1" >out
-            for (j=1; j<=nreqs; ++j) {
-               print "#ifdef PNG_" r[j] "_SUPPORTED" >out
-               print "#   undef PNG_no_if /*" r[j] "*/" >out
-               print "#endif" >out
-            }
-            print "#ifdef PNG_no_if /*missing if*/" >out
-            print "#   undef PNG_on" >out
-            # There is no checking above for this, because we
-            # don't know which 'if' to choose, so whine about
-            # it here:
-            if (option[i] == "on") {
-               print error, i, "needs one of:", iffs[i] end >out
-            }
-            print "#endif" >out
-         }
-
-         print "#ifdef PNG_on /*requires, if*/" >out
-         # enables
-         print "#   undef PNG_not_enabled" >out
-         print "#   define PNG_not_enabled 1" >out
-         print "   /* enabled by" enabledby[i], "*/" >out
-         nreqs = split(enabledby[i], r)
-         for (j=1; j<=nreqs; ++j) {
-            print "#ifdef PNG_" r[j] "_SUPPORTED" >out
-            print "#   undef PNG_not_enabled /*" r[j] "*/" >out
-            # Oops, probably not intended (should be factored
-            # out by the checks above).
-            if (option[i] == "off") {
-               print error, i, "enabled by:", r[j] end >out
-            }
-            print "#endif" >out
-         }
-
-         print "#   ifndef PNG_" i "_SUPPORTED /*!command line*/" >out
-         print "#    ifdef PNG_not_enabled /*!enabled*/" >out
-         # 'have_ifs' here means that everything = "off" still allows an 'if' on
-         # an otherwise enabled option to turn it on; otherwise the 'if'
-         # handling is effectively disabled by 'everything = off'
-         if (option[i] == "off" || option[i] == "disabled" && everything != "on" || option[i] == "enabled" && everything == "off" && !have_ifs) {
-            print "#      undef PNG_on /*default off*/" >out
-         } else {
-            print "#      ifdef PNG_NO_" i >out
-            print "#       undef PNG_on /*turned off*/" >out
-            print "#      endif" >out
-            print "#      ifdef PNG_NO_" i "_SUPPORTED" >out
-            print "#       undef PNG_on /*turned off*/" >out
-            print "#      endif" >out
-         }
-         print "#    endif /*!enabled*/" >out
-         print "#    ifdef PNG_on" >out
-         # The _SUPPORTED macro must be defined so that dependent
-         # options output later work.
-         print "#      define PNG_" i "_SUPPORTED" >out
-         print "#    endif" >out
-         print "#   endif /*!command line*/" >out
-         # If PNG_on is still set the option should be defined in
-         # pnglibconf.h
-         print "#   ifdef PNG_on" >out
-         if (i ~ /^fail_/) {
-            print error, i, "is on: enabled by:" iffs[i] enabledby[i] ", requires" requires[i] end >out
-         } else if (i !~ /^ok_/) {
-            print def i sup >out
-            # Supported option, set required settings
-            nreqs = split(sets[i], r)
-            for (j=1; j<=nreqs; ++j) {
-               print "#    ifdef PNG_set_" r[j] >out
-               # Some other option has already set a value:
-               print error, i, "sets", r[j] ": duplicate setting" end >out
-               print error, "   previous value: " end "PNG_set_" r[j] >out
-               print "#    else" >out
-               # Else set the default: note that this won't accept arbitrary
-               # values, the setval string must be acceptable to all the C
-               # compilers we use.  That means it must be VERY simple; a number,
-               # a name or a string.
-               print "#     define PNG_set_" r[j], setval[i " " r[j]] >out
-               print "#    endif" >out
-            }
-         }
-         print "#   endif /* definition */" >out
-         print "#endif /*requires, if*/" >out
-         if (logunsupported || i ~ /^ok_/) {
-            print "#ifndef  PNG_on" >out
-            if (logunsupported) {
-               print und i une >out
-            }
-            if (i ~ /^ok_/) {
-               print error, i, "not enabled: requires:" requires[i] ", enabled by:" iffs[i] enabledby[i] end >out
-            }
-            print "#endif" >out
-         }
-
-         done[i] = 1
-         ++movement
-      }
-
-      if (!finished && !movement) {
-         print "option: loop or missing option in dependency tree, cannot process:"
-         for (i in option) if (!done[i]) {
-            print "  option", i, "depends on" tree[i], "needs:"
-            nreqs = split(tree[i], r)
-            if (nreqs > 0) for (j=1; j<=nreqs; ++j) if (!done[r[j]]) {
-               print "   " r[j]
-            }
-         }
-         exit 1
-      }
-   }
-   print "PNG_DFN_END_SORT" >out
-   print comment, "end of options", cend >out
-
-   # Do the 'setting' values second, the algorithm the standard
-   # tree walk (O(1)) done in an O(2) while/for loop; iterations
-   # settings x depth, outputting the deepest required macros
-   # first.
-   print "" >out
-   print "/* SETTINGS */" >out
-   print comment, "settings", cend >out
-   # Sort (in dfn.awk) on field 2, the setting name
-   print "PNG_DFN_START_SORT 2" >out
-   finished = 0
-   while (!finished) {
-      finished = 1
-      movement = 0 # done nothing
-      for (i in setting) if (!doneset[i]) {
-         nreqs = split(setting[i], r)
-         if (nreqs > 0) {
-            # By default assume the requires values are options, but if there
-            # is no option with that name check for a setting
-            for (j=1; j<=nreqs; ++j) if (option[r[j]] == "" && !doneset[r[j]]) {
-               break
-            }
-            if (j<=nreqs) {
-               finished = 0
-               continue # try a different setting
-            }
-         }
-
-         # All the requirements have been processed, output
-         # this setting.
-         if (deb) print "setting", i
-         deflt = defaults[i]
-         # Remove any spurious trailing spaces
-         sub(/ *$/,"",deflt)
-         # A leading @ means leave it unquoted so the preprocessor
-         # can substitute the build time value
-         if (deflt ~ /^ @/)
-            deflt = " " subs substr(deflt, 3) sube
-         print "" >out
-         print "/* setting: ", i >out
-         print " *   requires:" setting[i] >out
-         print " *   default: ", defaults[i] deflt, "*/" >out
-         for (j=1; j<=nreqs; ++j) {
-            if (option[r[j]] != "")
-               print "#ifndef PNG_" r[j] "_SUPPORTED" >out
-            else
-               print "#ifndef PNG_" r[j] >out
-            print error, i, "requires", r[j] end >out
-            print "# endif" >out
-         }
-         # The precedence is:
-         #
-         #  1) External definition; trumps:
-         #  2) Option 'sets' value; trumps:
-         #  3) Setting 'default'
-         #
-         print "#ifdef PNG_" i >out
-         # PNG_<i> is defined, so substitute the value:
-         print def i, subs "PNG_" i sube end >out
-         print "#else /* use default */" >out
-         print "# ifdef PNG_set_" i >out
-         # Value from an option 'sets' argument
-         print def i, subs "PNG_set_" i sube end >out
-         # This is so that subsequent tests on the setting work:
-         print "#  define PNG_" i, "1" >out
-         if (defaults[i] != "") {
-            print "# else /*default*/" >out
-            print def i deflt end >out
-            print "#  define PNG_" i, "1" >out
-         }
-         print "# endif /* defaults */" >out
-         print "#endif /* setting", i, "*/" >out
-
-         doneset[i] = 1
-         ++movement
-      }
-
-      if (!finished && !movement) {
-         print "setting: loop or missing setting in 'requires', cannot process:"
-         for (i in setting) if (!doneset[i]) {
-            print "  setting", i, "requires" setting[i]
-         }
-         exit 1
-      }
-   }
-   print "PNG_DFN_END_SORT" >out
-   print comment, "end of settings", cend >out
-
-   # Regular end - everything looks ok
-   if (protect != "") {
-      print start "#endif", "/*", protect, "*/" end >out
-   }
-}
diff --git a/src/png/libpng/scripts/pnglibconf.dfa b/src/png/libpng/scripts/pnglibconf.dfa
deleted file mode 100644
index b298a72f3..000000000
--- a/src/png/libpng/scripts/pnglibconf.dfa
+++ /dev/null
@@ -1,919 +0,0 @@
-# scripts/pnglibconf.dfa - library build configuration control
-#
-@/*- pnglibconf.dfn intermediate file
-@ *  generated from scripts/pnglibconf.dfa
-@ */
-#
-com pnglibconf.h - library build configuration
-com
-version
-com
-com Copyright (c) 1998-2017 Glenn Randers-Pehrson
-com
-com This code is released under the libpng license.
-com For conditions of distribution and use, see the disclaimer
-com and license in png.h
-com
-
-file pnglibconf.h scripts/pnglibconf.dfa PNGLCONF_H
-
-# This file is preprocessed by scripts/options.awk and the
-# C compiler to generate 'pnglibconf.h' - a list of all the
-# configuration options.  The file lists the various options
-# that can *only* be specified during the libpng build;
-# pnglibconf.h freezes the definitions selected for the specific
-# build.
-#
-# The syntax is detailed in scripts/options.awk; this is a summary
-# only:
-#
-# setting <name> [requires ...] [default]
-#    #define PNG_<name> <value>  /* value comes from current setting */
-# option <name> [requires ...] [if ...] [enables ...] [disabled]
-#    #define PNG_<name>_SUPPORTED if the requirements are met and
-#    enable the other options listed
-# chunk <name> [requires ...] [enables ...] [disabled]
-#    Enable chunk processing for the given ancillary chunk; any
-#    'requires something' expands to READ_something for read and
-#    WRITE_something for write, but the enables list members are
-#    used as given (e.g. enables GAMMA just expands to that on the
-#    correspond READ_name and WRITE_name lines.)
-#
-# "," may be used to separate options on an 'option' line and is ignored; it
-# doesn't change the meaning of the line.  (NOT setting, where "," becomes
-# part of the setting!)  A comma at the end of an option line causes a
-# continuation (the next line is included in the option too.)
-#
-# Note that the 'on' and 'off' keywords, while valid on both option
-# and chunk, should not be used in this file because they force the
-# relevant options on or off.
-
-#----------------------------------------------------------------------
-
-# The following setting, option and chunk values can all be changed
-# while building libpng:
-#
-# setting: change 'setting' lines to fine tune library performance;
-#   changes to the settings don't affect the libpng API functionally
-#
-# option: change 'option' lines to remove or add capabilities from
-#   or to the library; options change the library API
-#
-# chunk: change 'chunk' lines to remove capabilities to process
-#   optional ('ancillary') chunks.  This does not prevent PNG
-#   decoding but does change the libpng API because some chunks
-#   will be ignored.
-#
-# There are three ways of disabling features, in no particular order:
-#
-# 1) Create 'pngusr.h', enter the required private build information
-# detailed below and #define PNG_NO_<option> for each option you
-# don't want in that file in that file.  You can also turn on options
-# using PNG_<option>_SUPPORTED.  When you have finished rerun
-# configure and rebuild pnglibconf.h file with -DPNG_USER_CONFIG:
-#
-#  make clean
-#  CPPFLAGS='-DPNG_USER_CONFIG' ./configure
-#  make pnglibconf.h
-#
-# pngusr.h is only used during the creation of pnglibconf.h, but it
-# is safer to ensure that -DPNG_USER_CONFIG is specified throughout
-# the build by changing the CPPFLAGS passed to the initial ./configure
-#
-# 2) Add definitions of the settings you want to change to
-# CPPFLAGS; for example:
-#
-#   -DPNG_DEFAULT_READ_MACROS=0
-#
-# (This would change the default to *not* use read macros.)  Be
-# very careful to change only settings that don't alter the API
-# because this approach bypasses the private build checking.  You
-# can also change settings from pngpriv.h (read pngpriv.h) safely
-# without API changes.  Do that in the same way.
-#
-# 3) Write a new '.dfa' file (say 'pngusr.dfa') and in this file
-# provide override values for setting entries and turn option or
-# chunk values explicitly 'on' or 'off':
-#
-#    setting FOO default VALUE
-#    option BAR [on|off]
-#
-# Then add this file to the options.awk command line (the *first*
-# one) after this file.  The make macro DFA_XTRA is provided to make
-# this easier (set it like CPPFLAGS prior to running ./configure).
-# Look at the builds below contrib/pngminim for some extreme examples
-# of how this can be used.
-#
-# Don't edit this file unless you are contributing a patch to
-# libpng and need new or modified options/settings.
-#----------------------------------------------------------------------
-
-# The following causes commented out #undef lines to be written to
-# pnglibconf.h; this can be stopped by logunsupported=0 in a later
-# file or on the command line (after pnglibconf.dfa)
-
-logunsupported = 1
-
-# The following allows the output from configure to modify the contents of
-# pnglibconf.h
-
-@#ifdef HAVE_CONFIG_H
-@#  include "config.h"
-@#endif
-
-# PNG_USER_CONFIG has to be defined on the compiler command line
-# to cause pngusr.h to be read while constructing pnglibconf.h
-#
-# If you create a private DLL you need to define the following
-# macros in the file 'pngusr.h' and set -DPNG_USER_CONFIG for
-# compilation (i.e. in CPPFLAGS.)
-# #define PNG_USER_PRIVATEBUILD \
-#     <Describes by whom and why this version of the DLL was built>
-#  e.g. #define PNG_USER_PRIVATEBUILD "Build by MyCompany for xyz reasons."
-# #define PNG_USER_DLLFNAME_POSTFIX <two-letter postfix that serve to
-#        distinguish your DLL from those of the official release. These
-#        correspond to the trailing letters that come after the version
-#        number and must match your private DLL name>
-#  e.g. // private DLL "libpng13gx.dll"
-#       #define PNG_USER_DLLFNAME_POSTFIX "gx"
-#
-# The following macros are also at your disposal if you want to complete the
-# DLL VERSIONINFO structure.
-# - PNG_USER_VERSIONINFO_COMMENTS
-# - PNG_USER_VERSIONINFO_COMPANYNAME
-# - PNG_USER_VERSIONINFO_LEGALTRADEMARKS
-
-# It is necessary to include configures definitions here so that AC_DEFINE
-# in configure.ac works in a comprehensible way
-@#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
-@#  include "config.h"
-@#endif
-
-@#ifdef PNG_USER_CONFIG
-@#  include "pngusr.h"
-@#endif
-
-# This is a special fixup for the Watcom C compiler on Windows, which has
-# multiple procedure call standards.  Unless PNG_API_RULE is set explicitly
-# (i.e. if it is not defined at this point) it will be forced to '2' here when
-# using Watcom.  This indicates to the other header files that Watcom behaviour
-# is required where appropriate.
-
-@#ifdef __WATCOMC__
-@#  ifndef PNG_API_RULE
-@#     define PNG_API_RULE 2 /* Use Watcom calling conventions */
-@#  endif
-@#endif
-
-# IN DEVELOPMENT
-# These are currently experimental features; define them if you want (NOTE:
-# experimental options must be disabled before they are defined in this file!)
-
-# NONE
-
-# Note that PNG_USER_CONFIG only has an effect when building
-# pnglibconf.h
-
-setting USER_CONFIG
-setting USER_PRIVATEBUILD
-setting USER_DLLFNAME_POSTFIX
-setting USER_VERSIONINFO_COMMENTS
-setting USER_VERSIONINFO_COMPANYNAME
-setting USER_VERSIONINFO_LEGALTRADEMARKS
-
-# Record the 'API rule' used to select calling conventions on
-# those systems that support such things (see all the comments in
-# pngconf.h)
-# Changing this setting has a fundamental affect on the PNG ABI,
-# do not release shared libraries with this changed.
-
-setting API_RULE default 0
-
-# This allows a prefix to be added to the front of every API function name (and
-# therefore every symbol) by redefining all the function names with the prefix
-# at the end of pnglibconf.h.  It also turns on similar internal symbol renaming
-# by causing a similar build-time only file, pngprefix.h, to be generated.
-
-setting PREFIX
-
-# Implementation specific control of the optimizations, enabled by those
-# hardware or software options that need it (typically when run-time choices
-# must be made by the user)
-option SET_OPTION disabled
-
-# These options are specific to the ARM NEON hardware optimizations.  At present
-# these optimizations depend on GCC specific pre-processing of an assembler (.S)
-# file so they probably won't work with other compilers.
-#
-# ARM_NEON_OPT: unset: check at compile time (__ARM_NEON__ must be defined by
-#                      the compiler, typically as a result of specifying
-#                      CC="gcc -mfpu=neon".)
-#                   0: disable (even if the CPU has a NEON FPU.)
-#                   1: check at run time (via ARM_NEON_{API,CHECK})
-#                   2: switch on unconditionally (inadvisable - instead pass
-#                      -mfpu=neon to GCC in CC)
-#           When building libpng avoid using any setting other than '0'; '1' is
-#           set automatically when either 'API' or 'CHECK' are configured in,
-#           '2' should not be necessary as -mfpu=neon will achieve the same
-#           effect as well as applying NEON optimizations to the rest of the
-#           libpng code.
-#           NOTE: any setting other than '0' requires ALIGNED_MEMORY
-# ARM_NEON_API:   (PNG_ARM_NEON == 1) allow the optimization to be switched on
-#                 with png_set_option
-# ARM_NEON_CHECK: (PNG_ARM_NEON == 1) compile a run-time check to see if Neon
-#                 extensions are supported. This is poorly supported and
-#                 deprecated - use the png_set_option API.
-setting ARM_NEON_OPT
-option ARM_NEON_API disabled requires ALIGNED_MEMORY enables SET_OPTION,
-   sets ARM_NEON_OPT 1
-option ARM_NEON_CHECK disabled requires ALIGNED_MEMORY,
-   sets ARM_NEON_OPT 1
-
-# These options are specific to the PowerPC VSX hardware optimizations.
-#
-# POWERPC_VSX_OPT: unset: check at compile time (__PPC64__,__ALTIVEC__,__VSX__
-#                      must be defined by the compiler, typically as a result
-#                      of specifying
-#                      "-mvsx -maltivec" compiler flags)
-#                   0: disable (even if the CPU supports VSX.)
-#                   1: check at run time (via POWERPC_VSX_{API,CHECK})
-#                   2: switch on unconditionally (inadvisable - instead pass
-#                      -mvsx -maltivec to compiler options)
-#           When building libpng avoid using any setting other than '0'; '1' is
-#           set automatically when either 'API' or 'CHECK' are configured in,
-#           '2' should not be necessary as "-mvsx -maltivec" will achieve the same
-#           effect as well as applying VSX optimizations to the rest of the
-#           libpng code.
-# POWERPC_VSX_API:   (PNG_POWERPC_VSX == 1) allow the optimization to be switched on
-#                 with png_set_option
-# POWERPC_VSX_CHECK: (PNG_POWERPC_VSX == 1) compile a run-time check to see if VSX
-#                 extensions are supported. This is supported not for all OSes
-#                 (see contrib/powerpc/README)
-setting POWERPC_VSX_OPT
-option POWERPC_VSX_API disabled enables SET_OPTION,
-  sets POWERPC_VSX_OPT 1
-option POWERPC_VSX_CHECK disabled,
-  sets POWERPC_VSX_OPT 1
-
-
-# These settings configure the default compression level (0-9) and 'strategy';
-# strategy is as defined by the implementors of zlib. It describes the input
-# data and modifies the zlib parameters in an attempt to optimize the balance
-# between search and huffman encoding in the zlib algorithms.  The defaults are
-# the zlib.h defaults - the apparently recursive definition does not arise
-# because the name of the setting is prefixed by PNG_
-#
-# The TEXT values are the defaults when writing compressed text (all forms)
-
-# Include the zlib header so that the defaults below are known
-@#  include <zlib.h>
-
-# The '@' here means to substitute the value when pnglibconf.h is built
-setting Z_DEFAULT_COMPRESSION default @Z_DEFAULT_COMPRESSION
-# TODO: why aren't these Z_RLE; zlib.h says that Z_RLE, specifically, is
-# appropriate for PNG images, maybe it doesn't exist in all versions?
-setting Z_DEFAULT_STRATEGY default @Z_FILTERED
-setting Z_DEFAULT_NOFILTER_STRATEGY default @Z_DEFAULT_STRATEGY
-setting ZLIB_VERNUM default @ZLIB_VERNUM
-
-# Linkage of:
-#
-#  API:      libpng API functions
-#  CALLBACK: internal non-file-local callbacks
-#  FUNCTION: internal non-file-local functions
-#  DATA:     internal non-file-local (const) data
-setting LINKAGE_API default extern
-setting LINKAGE_CALLBACK default extern
-setting LINKAGE_FUNCTION default extern
-setting LINKAGE_DATA default extern
-
-setting TEXT_Z_DEFAULT_COMPRESSION default @Z_DEFAULT_COMPRESSION
-setting TEXT_Z_DEFAULT_STRATEGY default @Z_DEFAULT_STRATEGY
-
-# Default to using the read macros
-
-setting DEFAULT_READ_MACROS default 1
-
-# The alternative is to call functions to read PNG values, if
-# the functions are turned *off* the read macros must always
-# be enabled, so turning this off will actually force the
-# USE_READ_MACROS option on (see pngconf.h)
-
-option READ_INT_FUNCTIONS requires READ
-
-# The same for write  but these can only be switched off if no writing
-# is required at all - hence the use of a 'disabled', not a 'requires'.
-# If these are needed, they are enabled in the 'WRITE options' section
-# below.
-
-option WRITE_INT_FUNCTIONS disabled
-
-# Error controls
-#
-# WARNINGS: normally on, if off no warnings are generated
-# ERROR_TEXT: normally on, if off errors happen but there is no message
-# ERROR_NUMBERS: unimplemented feature, therefore disabled
-# BENIGN_ERRORS: support for just issuing warnings for recoverable errors
-#
-# BENIGN_READ_ERRORS:
-#     By default recoverable errors on read should just generate warnings,
-#     generally safe but PNG files that don't conform to the specification will
-#     be accepted if a meaningful result can be produced.
-#
-# BENIGN_WRITE_ERRORS:
-#     By default recoverable errors on write should just generate warnings,
-#     not generally safe because this allows the application to write invalid
-#     PNG files.  Applications should enable this themselves; it's useful
-#     because it means that a failure to write an ancillary chunk can often be
-#     ignored.
-
-option WARNINGS
-option ERROR_TEXT
-option ERROR_NUMBERS disabled
-
-option BENIGN_ERRORS
-option BENIGN_WRITE_ERRORS requires BENIGN_ERRORS disabled
-option BENIGN_READ_ERRORS requires BENIGN_ERRORS
-
-
-# Generic options - affect both read and write.
-
-option MNG_FEATURES
-
-# Arithmetic options, the first is the big switch that chooses between internal
-# floating and fixed point arithmetic implementations - it does not affect any
-# APIs.  The second two (the _POINT settings) switch off individual APIs.
-#
-# Prior to libpng 1.6.8 one of the API (_POINT) variants had to be selected.  At
-# 1.6.8 this restriction has been removed; the simplified API can be used
-# without enabling any of the low level fixed/floating APIs.
-
-option FLOATING_ARITHMETIC
-option FLOATING_POINT
-option FIXED_POINT
-
-# This protects us against compilers that run on a windowing system
-# and thus don't have or would rather us not use the stdio types:
-# stdin, stdout, and stderr.  The only one currently used is stderr
-# in png_error() and png_warning().  #defining PNG_NO_CONSOLE_IO will
-# prevent these from being compiled and used. #defining PNG_NO_STDIO
-# will also prevent these, plus will prevent the entire set of stdio
-# macros and functions (FILE *, printf, etc.) from being compiled and used,
-# unless (PNG_DEBUG > 0) has been #defined.
-
-option STDIO
-option CONSOLE_IO requires STDIO
-
-# Note: prior to 1.5.0 this option could not be disabled if STDIO
-# was enabled.  Prior to 1.5.3 this option required STDIO
-
-option TIME_RFC1123
-
-# PNG_SETJMP_NOT_SUPPORTED is an old equivalent for NO_SETJMP
-
-option SETJMP
-= NO_SETJMP SETJMP_NOT_SUPPORTED
-
-# If this is disabled it is not possible for apps to get the
-# values from the 'info' structure, this effectively removes
-# quite a lot of the READ API.
-
-option EASY_ACCESS
-
-# Added at libpng-1.2.0
-
-option USER_MEM
-
-# Added at libpng-1.4.0
-
-option IO_STATE
-
-# Libpng limits: limit the size of images and data on read.
-#
-# If this option is disabled all the limit checking code will be disabled:
-
-option USER_LIMITS requires READ
-
-# The default settings given below for the limits mean that libpng will
-# limit the size of images or the size of data in ancillary chunks to less
-# than the specification or implementation limits. Settings have the
-# following interpretations:
-#
-# USER_WIDTH_MAX: maximum width of an image that will be read
-# USER_HEIGHT_MAX: maximum height
-# USER_CHUNK_MALLOC_MAX: maximum in-memory (decompressed) size of a single chunk
-# USER_CHUNK_CACHE_MAX: maximum number of chunks to be cached
-#
-# Only chunks that are variable in number are counted towards the
-
-# Use 0x7fffffff for unlimited
-setting USER_WIDTH_MAX default        1000000
-setting USER_HEIGHT_MAX default       1000000
-
-# Use 0 for unlimited
-setting USER_CHUNK_CACHE_MAX default     1000
-setting USER_CHUNK_MALLOC_MAX default 8000000
-
-# If this option is enabled APIs to set the above limits at run time are added;
-# without this the hardwired (compile time) limits will be used.
-option SET_USER_LIMITS requires USER_LIMITS
-
-# All of the following options relate to code capabilities for
-# processing image data before creating a PNG or after reading one.
-# You can remove these capabilities safely and still be PNG
-# conformant, however the library that results is still non-standard.
-# See the comments above about how to change options and settings.
-
-# READ options
-#
-# WARNING: in libpng 1.5 maintained configuration compatibility with earlier
-# versions.  In some cases turning off an option turned off other options, in
-# others it was ineffective unless dependent options were also turned off.
-# Libpng 1.6 changes this: in general if you turn off an option that affects
-# APIs it stays off and simply disables APIs that depend on it.
-#
-# As a result if you simply port the libpng 1.5 configuration to libpng 1.6 you
-# will probably see build failures due to missing APIs.  Fixing these failures
-# requires some, perhaps considerable, knowledge of what your libpng using
-# applications are doing, fortunately there is no great reason for you to move
-# to libpng 1.6; the new interfaces in 1.6 will take several years to become
-# popular.
-
-option READ enables READ_INTERLACING SET_OPTION
-
-# Disabling READ_16BIT does not disable reading 16-bit PNG files, but it
-# forces them to be chopped down to 8-bit, and disables any 16-bit
-# processing after that has happened.  You need to be sure to enable
-# READ_SCALE_16_TO_8 or READ_STRIP_16_TO_8 when you disable READ_16BIT for
-# this to work properly.  You should disable the other option if you need to
-# ensure a particular conversion (otherwise the app can chose.)
-
-option READ_16BIT requires READ enables 16BIT
-
-option READ_QUANTIZE requires READ
-
-option READ_TRANSFORMS requires READ
-= NO_READ_TRANSFORMS READ_TRANSFORMS_NOT_SUPPORTED
-
-# Read gamma handling.  Gamma processing is a core part of libpng and many of
-# the capabilities are dependent on libpng performing gamma correction.
-#
-# In libpng 1.6 disabling gamma processing (setting PNG_NO_READ_GAMMA)
-# consistently disables those parts of the API that depend on it.  Prior to
-# 1.6.0 this was not true; the results were unpredictable and varied between
-# releases.
-#
-# If you disable gamma processing and your program no longer compiles you need
-# to ask whether you really need the APIs that are missing.  If you do then you
-# almost certainly need the gamma processing.
-#
-# If you handle gamma issues outside libpng then you do not need the libpng
-# gamma processing; and it is an enormous waste of space.  You just need to
-# remove the use of libpng APIs that depend on it.
-option READ_GAMMA requires READ_TRANSFORMS, READ_gAMA, READ_sRGB
-
-option READ_ALPHA_MODE requires READ_TRANSFORMS, READ_GAMMA
-option READ_BACKGROUND requires READ_TRANSFORMS, READ_STRIP_ALPHA, READ_GAMMA
-option READ_BGR requires READ_TRANSFORMS
-option READ_EXPAND_16 requires READ_TRANSFORMS, READ_16BIT, READ_EXPAND
-option READ_EXPAND requires READ_TRANSFORMS
-option READ_FILLER requires READ_TRANSFORMS
-option READ_GRAY_TO_RGB requires READ_TRANSFORMS
-option READ_INVERT_ALPHA requires READ_TRANSFORMS
-option READ_INVERT requires READ_TRANSFORMS
-option READ_PACK requires READ_TRANSFORMS
-option READ_PACKSWAP requires READ_TRANSFORMS
-option READ_RGB_TO_GRAY requires READ_TRANSFORMS, READ_GAMMA enables COLORSPACE
-option READ_SCALE_16_TO_8 requires READ_TRANSFORMS
-option READ_SHIFT requires READ_TRANSFORMS
-option READ_STRIP_16_TO_8 requires READ_TRANSFORMS
-option READ_STRIP_ALPHA requires READ_TRANSFORMS
-option READ_SWAP_ALPHA requires READ_TRANSFORMS
-option READ_SWAP requires READ_TRANSFORMS, READ_16BIT
-option READ_USER_TRANSFORM requires READ_TRANSFORMS
-
-option PROGRESSIVE_READ requires READ
-option SEQUENTIAL_READ requires READ
-
-# You can define PNG_NO_PROGRESSIVE_READ if you don't do progressive reading.
-# This is not talking about interlacing capability!  You'll still have
-# interlacing unless you turn off the following which is required
-# for PNG-compliant decoders.  (In other words, do not do this - in
-# fact it can't be disabled from the command line!)
-#option READ_INTERLACING requires READ
-
-option READ_COMPOSITE_NODIV requires READ
-= NO_READ_COMPOSITE_NODIV NO_READ_COMPOSITED_NODIV
-
-# Inch conversions
-
-option INCH_CONVERSIONS
-= INCH_CONVERSIONS INCH_CONVERSIONS
-
-# API to build a grayscale palette
-# NOTE: this is not used internally by libpng at present.
-
-option BUILD_GRAYSCALE_PALETTE
-
-# WRITE options
-
-option WRITE enables WRITE_INT_FUNCTIONS
-
-# Disabling WRITE_16BIT prevents 16-bit PNG files from being
-# generated.
-option WRITE_16BIT requires WRITE enables 16BIT
-
-option WRITE_TRANSFORMS requires WRITE
-= NO_WRITE_TRANSFORMS WRITE_TRANSFORMS_NOT_SUPPORTED
-
-option WRITE_SHIFT requires WRITE_TRANSFORMS
-option WRITE_PACK requires WRITE_TRANSFORMS
-option WRITE_BGR requires WRITE_TRANSFORMS
-option WRITE_SWAP requires WRITE_TRANSFORMS, WRITE_16BIT
-option WRITE_PACKSWAP requires WRITE_TRANSFORMS
-option WRITE_INVERT requires WRITE_TRANSFORMS
-option WRITE_FILLER requires WRITE_TRANSFORMS
-option WRITE_SWAP_ALPHA requires WRITE_TRANSFORMS
-option WRITE_INVERT_ALPHA requires WRITE_TRANSFORMS
-option WRITE_USER_TRANSFORM requires WRITE_TRANSFORMS
-
-# This is not required for PNG-compliant encoders, but can cause
-# trouble if left undefined
-
-option WRITE_INTERLACING requires WRITE
-
-# Deprecated, will be removed.
-option WRITE_WEIGHTED_FILTER requires WRITE
-
-option WRITE_FLUSH requires WRITE
-
-# Note: these can be turned off explicitly if not required by the
-# apps implementing the user transforms
-option USER_TRANSFORM_PTR if READ_USER_TRANSFORM, WRITE_USER_TRANSFORM
-option USER_TRANSFORM_INFO if READ_USER_TRANSFORM, WRITE_USER_TRANSFORM
-
-# This enables API to set compression parameters for compressing
-# non-IDAT chunks (zTXt, iTXt, iCCP, and unknown chunks).  This feature
-# was added at libpng-1.5.3.
-option WRITE_CUSTOMIZE_ZTXT_COMPRESSION requires WRITE
-option WRITE_CUSTOMIZE_COMPRESSION requires WRITE
-
-# Any chunks you are not interested in, you can undef here.  The
-# ones that allocate memory may be especially important (hIST,
-# tEXt, zTXt, tRNS, pCAL).  Others will just save time and make png_info
-# a bit smaller.
-
-# The size of the png_text structure changed in libpng-1.0.6 when
-# iTXt support was added.  iTXt support was turned off by default through
-# libpng-1.2.x, to support old apps that malloc the png_text structure
-# instead of calling png_set_text() and letting libpng malloc it.  It
-# was turned on by default in libpng-1.4.0.
-
-option READ_ANCILLARY_CHUNKS requires READ
-# PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED is deprecated.
-= NO_READ_ANCILLARY_CHUNKS READ_ANCILLARY_CHUNKS_NOT_SUPPORTED
-
-option WRITE_ANCILLARY_CHUNKS requires WRITE
-# PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED is deprecated.
-= NO_WRITE_ANCILLARY_CHUNKS WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED
-
-# These options disable *all* the text chunks if turned off
-
-option TEXT disabled
-option READ_TEXT requires READ_ANCILLARY_CHUNKS enables TEXT
-option WRITE_TEXT requires WRITE_ANCILLARY_CHUNKS enables TEXT
-
-# Moved to pnglibconf.h at libpng-1.5.0
-# Feature support: in 1.4 this was in pngconf.h, but the following
-# features have no affect on the libpng API.  Add library
-# only features to the end of this list.  Add features that
-# affect the API above.  (Note: the list of chunks follows
-# the library-only settings.)
-#
-# BUILD TIME ONLY OPTIONS
-#   These options do not affect the API but rather alter how the
-#   API is implemented, they get recorded in pnglibconf.h, but
-#   can't be changed by the application.
-
-# Colorspace support (enabled as required); just the support for colorant
-# information.  Gamma support, likewise, is just support for the gamma
-# information, READ_GAMMA is required for gamma transformations (so it
-# is possible to read PNG gamma without enabling all the libpng transform
-# code - do this for applications that do their own gamma processing)
-#
-# As of 1.6.0 COLORSPACE is only useful if the application processes the
-# information; this is because the library does not do any colorspace
-# processing, it just validates the data in the PNG file.
-
-option GAMMA disabled
-option COLORSPACE enables GAMMA disabled
-
-# When an ICC profile is read, or png_set, it will be checked for a match
-# against known sRGB profiles if the sRGB handling is enabled.  The
-# PNG_sRGB_PROFILE_CHECKS setting controls how much work is done during the
-# check:
-#
-# -1: Don't do any sRGB profile checking.
-#
-#  0: Just validate the profile MD5 signature if present, otherwise use
-#     the checks in option 1.
-#
-#  1: Additionally check the length, intent and adler32 checksum of the
-#     actual data.   If enabled this will reject known profiles that have
-#     had the rendering intent in the header changed as well as other edits
-#     done without updating the checksum.  See the discussion below.
-#
-#  2: Additionally checksum all the data using the ethernet CRC32 algorithm.
-#     This makes it more difficult to fake profiles and makes it less likely
-#     to get a false positive on profiles with no signature, but is probably
-#     just a waste of time since all currently approved ICC sRGB profiles have
-#     a secure MD5 signature.
-#
-# The rendering intent.  An ICC profile stores an intended rendering intent,
-# but does not include the value in the signature.  The intent is documented
-# as the intent that should be used when combining two profiles.  The sRGB
-# profile is intended, however, to be used with any of the four defined intents.
-# For this reason the sRGB chunk includes an 'intent' to be used when displaying
-# the image (intent is really a property of the image not the profile.)
-#
-# Unfortunately the iCCP chunk does not.  It may therefore be that some
-# applications modify the intent in profiles (including sRGB profiles) to work
-# round this problem.  Selecting an option other than option '0' will cause such
-# modified profiles to be rejected.
-#
-# Security.  The use of Adler32 and CRC32 checksums does not help significantly
-# with any security issues.  It is relatively easy to produce arbitrary profiles
-# with the required checksums on current computer systems.  Nevertheless
-# security does not seem to be an issue because the only consequence of a false
-# positive is a false assertion that the profile is an sRGB profile.  This might
-# be used to hide data from libpng using applications, but it doesn't seem
-# possible to damage them.
-
-setting sRGB_PROFILE_CHECKS default 2
-
-# Artificially align memory - the code typically aligns to 8 byte
-# boundaries if this is switched on, it's a small waste of space
-# but can help (in theory) on some architectures.  Only affects
-# internal structures.  Added at libpng 1.4.0
-
-option ALIGNED_MEMORY
-
-# Buggy compilers (e.g., gcc 2.7.2.2) need PNG_NO_POINTER_INDEXING
-# See png[wr]util.c, normally this should always be *on*
-
-option POINTER_INDEXING
-
-# Other defines for things like memory and the like can go here.
-
-# BUILD TIME SETTINGS
-# Like build time options these do not affect the API, but they
-# may be useful to applications because they record details of
-# how the API will behave particularly with regard to overall
-# accuracy.
-
-# This controls how fine the quantizing gets.  As this allocates
-# a largish chunk of memory (32K), those who are not as concerned
-# with quantizing quality can decrease some or all of these.
-
-setting QUANTIZE_RED_BITS default 5
-setting QUANTIZE_GREEN_BITS default 5
-setting QUANTIZE_BLUE_BITS default 5
-
-# This controls how fine the gamma correction becomes when you
-# are only interested in 8 bits anyway.  Increasing this value
-# results in more memory being used, and more pow() functions
-# being called to fill in the gamma tables.  Don't set this value
-# less than 8, and even that may not work (I haven't tested it).
-
-setting MAX_GAMMA_8 default 11
-
-# This controls how much a difference in gamma we can tolerate before
-# we actually start doing gamma conversion, it's a fixed point value,
-# so the default below is 0.05, meaning libpng ignores corrections in
-# the range 0.95 to 1.05
-
-setting GAMMA_THRESHOLD_FIXED default 5000
-
-# Precision to use when converting a floating point value to a PNG
-# extension format string in an sCAL chunk (only relevant if the
-# floating point API is enabled)
-
-setting sCAL_PRECISION default 5
-
-# This is the size of the compression buffer, and thus the size of
-# an IDAT chunk.  Make this whatever size you feel is best for your
-# machine.  One of these will be allocated per png_struct.  When this
-# is full, it writes the data to the disk, and does some other
-# calculations.  Making this an extremely small size may slow
-# the library down, but you may want to experiment to determine
-# where it becomes significant, if you are concerned with memory
-# usage.  Note that zlib allocates at least 32Kb also.  For readers,
-# this describes the size of the buffer available to read the data in.
-# Unless this gets smaller than the size of a row (compressed),
-# it should not make much difference how big this is.
-
-setting ZBUF_SIZE default 8192
-
-# This is the size of the decompression buffer used when counting or checking
-# the decompressed size of an LZ stream from a compressed ancillary chunk; the
-# decompressed data is never used so a different size may be optimal.  This size
-# was determined using contrib/libtests/timepng.c with compressed zTXt data
-# around 11MByte in size.  Slight speed improvements (up to about 14% in
-# timepng) can be achieved by very large increases (to 32kbyte) on regular data,
-# but highly compressible data shows only around 2% improvement.   The size is
-# chosen to minimize the effects of DoS attacks based on using very large
-# amounts of highly compressible data.
-
-setting INFLATE_BUF_SIZE default 1024
-
-# This is the maximum amount of IDAT data that the sequential reader will
-# process at one time.  The setting does not affect the size of IDAT chunks
-# read, just the amount read at once.  Neither does it affect the progressive
-# reader, which processes just the amount of data the application gives it.
-# The sequential reader is currently unable to process more than one IDAT at
-# once - it has to read and process each one in turn.  There is no point setting
-# this to a value larger than the IDAT chunks typically encountered (it would
-# just waste memory) but there may be some point in reducing it below the value
-# of ZBUF_SIZE (the size of IDAT chunks written by libpng.)
-
-setting IDAT_READ_SIZE default PNG_ZBUF_SIZE
-
-# Ancillary chunks
-chunk bKGD
-chunk cHRM enables COLORSPACE
-chunk eXIf
-chunk gAMA enables GAMMA
-chunk hIST
-chunk iCCP enables COLORSPACE, GAMMA
-chunk iTXt enables TEXT
-chunk oFFs
-chunk pCAL
-chunk pHYs
-chunk sBIT
-chunk sCAL
-chunk sPLT
-chunk sRGB enables COLORSPACE, GAMMA, SET_OPTION
-chunk tEXt requires TEXT
-chunk tIME
-chunk tRNS
-chunk zTXt enables TEXT
-
-# This only affects support of the optional PLTE chunk in RGB and RGBA
-# images.  Notice that READ_ANCILLARY_CHUNKS therefore disables part
-# of the regular chunk reading too.
-
-option READ_OPT_PLTE requires READ_ANCILLARY_CHUNKS
-
-# Unknown chunk handling
-#
-# 'UNKNOWN_CHUNKS' is a global option to disable all unknown chunk handling on
-# read or write; everything else below requires it (directly or indirectly).
-option UNKNOWN_CHUNKS
-
-# There are three main options to control the ability to read and write unknown
-# chunks.  If either read option is turned on then unknown chunks will be read,
-# otherwise they are skipped.  If the write option is turned on unknown chunks
-# set by png_set_unknown_chunks will be written otherwise it is an error to call
-# that API on a write struct.
-option WRITE_UNKNOWN_CHUNKS requires WRITE requires UNKNOWN_CHUNKS
-option WRITE_UNKNOWN_CHUNKS enables STORE_UNKNOWN_CHUNKS
-
-# The first way to read user chunks is to have libpng save them for a later call
-# to png_get_unknown_chunks, the application must call
-# png_set_keep_unknown_chunks to cause this to actually happen (see png.h)
-option SAVE_UNKNOWN_CHUNKS requires READ requires SET_UNKNOWN_CHUNKS
-option SAVE_UNKNOWN_CHUNKS enables READ_UNKNOWN_CHUNKS, STORE_UNKNOWN_CHUNKS
-
-# The second approach is to use an application provided callback to process the
-# chunks, the callback can either handle the chunk entirely itself or request
-# that libpng store the chunk for later retrieval via png_get_unknown_chunks.
-#
-# NOTE: If STORE_UNKNOWN_CHUNKS is not enabled (which is the default if
-# both SAVE_UNKNOWN_CHUNKS and WRITE_UNKNOWN_CHUNKS are disabled) then a
-# 0 result from the callback will be ignored because no support for saving
-# unknown chunks has been compiled in.  The normal symptom is that your app
-# fails to compile because png_get_unknown_chunks is no longer defined in png.h.
-# If you encounter this issue simply enable STORE_UNKNOWN_CHUNKS in your build.
-#
-# Note that there is no 'WRITE_USER_CHUNKS' so the USER_CHUNKS option is always
-# the same as READ_USER_CHUNKS at present
-option READ_USER_CHUNKS requires READ, UNKNOWN_CHUNKS
-option READ_USER_CHUNKS enables READ_UNKNOWN_CHUNKS, USER_CHUNKS
-
-# Two further options are provided to allow detailed control of the handling.
-# The first enables png_set_keep_unknown_chunks; this allows the default to be
-# changed from discarding unknown chunks and allows per-chunk control.  This is
-# required to use the SAVE_UNKNOWN_CHUNKS option.  If enabled this option also
-# applies to write (see png.h), otherwise the write API simply writes all the
-# chunks it is given.
-#
-# The second option extends the unknown handling to allow known chunks to be
-# handled as though they were unknown.  This option doesn't change any APIs, it
-# merely turns on the code to check known as well as unknown chunks.
-#
-# This option no longer affects the write code.  It can be safely disabled and
-# will prevent applications stopping libpng reading known chunks.
-option SET_UNKNOWN_CHUNKS requires UNKNOWN_CHUNKS
-option HANDLE_AS_UNKNOWN requires SET_UNKNOWN_CHUNKS
-
-# The following options are derived from the above and should not be turned on
-# explicitly.
-option READ_UNKNOWN_CHUNKS requires UNKNOWN_CHUNKS disabled
-option STORE_UNKNOWN_CHUNKS requires UNKNOWN_CHUNKS disabled
-
-option CONVERT_tIME requires WRITE_ANCILLARY_CHUNKS
-# The "tm" structure is not supported on WindowsCE
-
-@#ifdef _WIN32_WCE
-@#   define PNG_NO_CONVERT_tIME
-@#endif
-
-option WRITE_FILTER requires WRITE
-
-option SAVE_INT_32 disabled
-# png_save_int_32 is required internally for writing the ancillary chunks oFFs
-# and pCAL and for both reading and writing iCCP (for the generation/checking of
-# the corresponding cHRM/gAMA chunks) if full ICC is supported.
-
-# added at libpng-1.5.4
-
-option WRITE_OPTIMIZE_CMF requires WRITE
-
-option READ_COMPRESSED_TEXT disabled
-option READ_iCCP enables READ_COMPRESSED_TEXT
-option READ_iTXt enables READ_COMPRESSED_TEXT
-option READ_zTXt enables READ_COMPRESSED_TEXT
-
-option WRITE_oFFs enables SAVE_INT_32
-option WRITE_pCAL enables SAVE_INT_32
-option WRITE_cHRM enables SAVE_INT_32
-
-option WRITE_COMPRESSED_TEXT disabled
-option WRITE_iCCP enables WRITE_COMPRESSED_TEXT
-option WRITE_iTXt enables WRITE_COMPRESSED_TEXT
-option WRITE_zTXt enables WRITE_COMPRESSED_TEXT
-
-# Turn this off to disable png_read_png() and png_write_png() and
-# leave the row_pointers member out of the info structure.
-
-option INFO_IMAGE
-
-# added at libpng-1.5.10
-# Turn this off to disable warning about invalid palette index and
-# leave the num_palette_max member out of the png structure.
-
-option CHECK_FOR_INVALID_INDEX enables READ_CHECK_FOR_INVALID_INDEX
-option CHECK_FOR_INVALID_INDEX enables WRITE_CHECK_FOR_INVALID_INDEX
-option READ_CHECK_FOR_INVALID_INDEX requires READ, CHECK_FOR_INVALID_INDEX
-option WRITE_CHECK_FOR_INVALID_INDEX requires WRITE, CHECK_FOR_INVALID_INDEX
-
-# added at libpng-1.5.15
-option GET_PALETTE_MAX enables READ_GET_PALETTE_MAX WRITE_GET_PALETTE_MAX
-option READ_GET_PALETTE_MAX requires READ_CHECK_FOR_INVALID_INDEX disabled
-option WRITE_GET_PALETTE_MAX requires WRITE_CHECK_FOR_INVALID_INDEX disabled
-
-# Simplified API options (added at libpng-1.6.0)
-#  In libpng 1.6.8 the handling of these options was changed to used 'requires'
-#  throughout, so that disabling some of the low level support always disables
-#  the base simplified read/write API.  This much simplifies the handling and
-#  makes 'everything = off' work in a more intuitive way.  It eliminates a
-#  previously reported feature that APIs previously enabled by the simplified
-#  API couldn't be turned off without explicitly turning off the simplified
-#  APIs.
-#
-# Read:
-option SIMPLIFIED_READ,
-   requires SEQUENTIAL_READ, READ_TRANSFORMS, SETJMP, BENIGN_ERRORS,
-      READ_EXPAND, READ_16BIT, READ_EXPAND_16, READ_SCALE_16_TO_8,
-      READ_RGB_TO_GRAY, READ_ALPHA_MODE, READ_BACKGROUND, READ_STRIP_ALPHA,
-      READ_FILLER, READ_SWAP, READ_PACK, READ_GRAY_TO_RGB, READ_GAMMA,
-      READ_tRNS, READ_bKGD, READ_gAMA, READ_cHRM, READ_sRGB, READ_sBIT
-
-# AFIRST and BGR read options:
-#  Prior to libpng 1.6.8 these were disabled but switched on if the low level
-#  libpng routines that do the swaps were enabled.  This worked but was
-#  confusing.  In libpng 1.6.8 the options were changed to simple 'requires'
-#  and are enabled by default.  This should work the same way in practice.
-option SIMPLIFIED_READ_AFIRST enables FORMAT_AFIRST,
-   requires SIMPLIFIED_READ READ_SWAP_ALPHA
-
-option SIMPLIFIED_READ_BGR enables FORMAT_BGR,
-   requires SIMPLIFIED_READ READ_BGR
-
-# Write:
-option SIMPLIFIED_WRITE,
-   requires WRITE, SETJMP, WRITE_SWAP, WRITE_PACK,
-      WRITE_tRNS, WRITE_gAMA, WRITE_sRGB, WRITE_cHRM
-
-# 1.6.22: allow simplified write without stdio support:
-option SIMPLIFIED_WRITE_STDIO requires SIMPLIFIED_WRITE STDIO
-
-option SIMPLIFIED_WRITE_AFIRST enables FORMAT_AFIRST,
-   requires SIMPLIFIED_WRITE WRITE_SWAP_ALPHA
-
-option SIMPLIFIED_WRITE_BGR enables FORMAT_BGR,
-   requires SIMPLIFIED_WRITE WRITE_BGR
-
-# Formats:
-option FORMAT_AFIRST disabled
-option FORMAT_BGR disabled
diff --git a/src/png/libpng/scripts/pnglibconf.h.prebuilt b/src/png/libpng/scripts/pnglibconf.h.prebuilt
deleted file mode 100644
index 53b5e442c..000000000
--- a/src/png/libpng/scripts/pnglibconf.h.prebuilt
+++ /dev/null
@@ -1,220 +0,0 @@
-/* libpng 1.6.34 STANDARD API DEFINITION */
-
-/* pnglibconf.h - library build configuration */
-
-/* Libpng version 1.6.34 - September 29, 2017 */
-
-/* Copyright (c) 1998-2017 Glenn Randers-Pehrson */
-
-/* This code is released under the libpng license. */
-/* For conditions of distribution and use, see the disclaimer */
-/* and license in png.h */
-
-/* pnglibconf.h */
-/* Machine generated file: DO NOT EDIT */
-/* Derived from: scripts/pnglibconf.dfa */
-#ifndef PNGLCONF_H
-#define PNGLCONF_H
-/* options */
-#define PNG_16BIT_SUPPORTED
-#define PNG_ALIGNED_MEMORY_SUPPORTED
-/*#undef PNG_ARM_NEON_API_SUPPORTED*/
-/*#undef PNG_ARM_NEON_CHECK_SUPPORTED*/
-/*#undef PNG_POWERPC_VSX_API_SUPPORTED*/
-/*#undef PNG_POWERPC_VSX_CHECK_SUPPORTED*/
-#define PNG_BENIGN_ERRORS_SUPPORTED
-#define PNG_BENIGN_READ_ERRORS_SUPPORTED
-/*#undef PNG_BENIGN_WRITE_ERRORS_SUPPORTED*/
-#define PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
-#define PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
-#define PNG_COLORSPACE_SUPPORTED
-#define PNG_CONSOLE_IO_SUPPORTED
-#define PNG_CONVERT_tIME_SUPPORTED
-#define PNG_EASY_ACCESS_SUPPORTED
-/*#undef PNG_ERROR_NUMBERS_SUPPORTED*/
-#define PNG_ERROR_TEXT_SUPPORTED
-#define PNG_FIXED_POINT_SUPPORTED
-#define PNG_FLOATING_ARITHMETIC_SUPPORTED
-#define PNG_FLOATING_POINT_SUPPORTED
-#define PNG_FORMAT_AFIRST_SUPPORTED
-#define PNG_FORMAT_BGR_SUPPORTED
-#define PNG_GAMMA_SUPPORTED
-#define PNG_GET_PALETTE_MAX_SUPPORTED
-#define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#define PNG_INCH_CONVERSIONS_SUPPORTED
-#define PNG_INFO_IMAGE_SUPPORTED
-#define PNG_IO_STATE_SUPPORTED
-#define PNG_MNG_FEATURES_SUPPORTED
-#define PNG_POINTER_INDEXING_SUPPORTED
-#define PNG_PROGRESSIVE_READ_SUPPORTED
-#define PNG_READ_16BIT_SUPPORTED
-#define PNG_READ_ALPHA_MODE_SUPPORTED
-#define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
-#define PNG_READ_BACKGROUND_SUPPORTED
-#define PNG_READ_BGR_SUPPORTED
-#define PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED
-#define PNG_READ_COMPOSITE_NODIV_SUPPORTED
-#define PNG_READ_COMPRESSED_TEXT_SUPPORTED
-#define PNG_READ_EXPAND_16_SUPPORTED
-#define PNG_READ_EXPAND_SUPPORTED
-#define PNG_READ_FILLER_SUPPORTED
-#define PNG_READ_GAMMA_SUPPORTED
-#define PNG_READ_GET_PALETTE_MAX_SUPPORTED
-#define PNG_READ_GRAY_TO_RGB_SUPPORTED
-#define PNG_READ_INTERLACING_SUPPORTED
-#define PNG_READ_INT_FUNCTIONS_SUPPORTED
-#define PNG_READ_INVERT_ALPHA_SUPPORTED
-#define PNG_READ_INVERT_SUPPORTED
-#define PNG_READ_OPT_PLTE_SUPPORTED
-#define PNG_READ_PACKSWAP_SUPPORTED
-#define PNG_READ_PACK_SUPPORTED
-#define PNG_READ_QUANTIZE_SUPPORTED
-#define PNG_READ_RGB_TO_GRAY_SUPPORTED
-#define PNG_READ_SCALE_16_TO_8_SUPPORTED
-#define PNG_READ_SHIFT_SUPPORTED
-#define PNG_READ_STRIP_16_TO_8_SUPPORTED
-#define PNG_READ_STRIP_ALPHA_SUPPORTED
-#define PNG_READ_SUPPORTED
-#define PNG_READ_SWAP_ALPHA_SUPPORTED
-#define PNG_READ_SWAP_SUPPORTED
-#define PNG_READ_TEXT_SUPPORTED
-#define PNG_READ_TRANSFORMS_SUPPORTED
-#define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
-#define PNG_READ_USER_CHUNKS_SUPPORTED
-#define PNG_READ_USER_TRANSFORM_SUPPORTED
-#define PNG_READ_bKGD_SUPPORTED
-#define PNG_READ_cHRM_SUPPORTED
-#define PNG_READ_eXIf_SUPPORTED
-#define PNG_READ_gAMA_SUPPORTED
-#define PNG_READ_hIST_SUPPORTED
-#define PNG_READ_iCCP_SUPPORTED
-#define PNG_READ_iTXt_SUPPORTED
-#define PNG_READ_oFFs_SUPPORTED
-#define PNG_READ_pCAL_SUPPORTED
-#define PNG_READ_pHYs_SUPPORTED
-#define PNG_READ_sBIT_SUPPORTED
-#define PNG_READ_sCAL_SUPPORTED
-#define PNG_READ_sPLT_SUPPORTED
-#define PNG_READ_sRGB_SUPPORTED
-#define PNG_READ_tEXt_SUPPORTED
-#define PNG_READ_tIME_SUPPORTED
-#define PNG_READ_tRNS_SUPPORTED
-#define PNG_READ_zTXt_SUPPORTED
-#define PNG_SAVE_INT_32_SUPPORTED
-#define PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED
-#define PNG_SEQUENTIAL_READ_SUPPORTED
-#define PNG_SETJMP_SUPPORTED
-#define PNG_SET_OPTION_SUPPORTED
-#define PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
-#define PNG_SET_USER_LIMITS_SUPPORTED
-#define PNG_SIMPLIFIED_READ_AFIRST_SUPPORTED
-#define PNG_SIMPLIFIED_READ_BGR_SUPPORTED
-#define PNG_SIMPLIFIED_READ_SUPPORTED
-#define PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED
-#define PNG_SIMPLIFIED_WRITE_BGR_SUPPORTED
-#define PNG_SIMPLIFIED_WRITE_STDIO_SUPPORTED
-#define PNG_SIMPLIFIED_WRITE_SUPPORTED
-#define PNG_STDIO_SUPPORTED
-#define PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
-#define PNG_TEXT_SUPPORTED
-#define PNG_TIME_RFC1123_SUPPORTED
-#define PNG_UNKNOWN_CHUNKS_SUPPORTED
-#define PNG_USER_CHUNKS_SUPPORTED
-#define PNG_USER_LIMITS_SUPPORTED
-#define PNG_USER_MEM_SUPPORTED
-#define PNG_USER_TRANSFORM_INFO_SUPPORTED
-#define PNG_USER_TRANSFORM_PTR_SUPPORTED
-#define PNG_WARNINGS_SUPPORTED
-#define PNG_WRITE_16BIT_SUPPORTED
-#define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
-#define PNG_WRITE_BGR_SUPPORTED
-#define PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED
-#define PNG_WRITE_COMPRESSED_TEXT_SUPPORTED
-#define PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED
-#define PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
-#define PNG_WRITE_FILLER_SUPPORTED
-#define PNG_WRITE_FILTER_SUPPORTED
-#define PNG_WRITE_FLUSH_SUPPORTED
-#define PNG_WRITE_GET_PALETTE_MAX_SUPPORTED
-#define PNG_WRITE_INTERLACING_SUPPORTED
-#define PNG_WRITE_INT_FUNCTIONS_SUPPORTED
-#define PNG_WRITE_INVERT_ALPHA_SUPPORTED
-#define PNG_WRITE_INVERT_SUPPORTED
-#define PNG_WRITE_OPTIMIZE_CMF_SUPPORTED
-#define PNG_WRITE_PACKSWAP_SUPPORTED
-#define PNG_WRITE_PACK_SUPPORTED
-#define PNG_WRITE_SHIFT_SUPPORTED
-#define PNG_WRITE_SUPPORTED
-#define PNG_WRITE_SWAP_ALPHA_SUPPORTED
-#define PNG_WRITE_SWAP_SUPPORTED
-#define PNG_WRITE_TEXT_SUPPORTED
-#define PNG_WRITE_TRANSFORMS_SUPPORTED
-#define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-#define PNG_WRITE_USER_TRANSFORM_SUPPORTED
-#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
-#define PNG_WRITE_bKGD_SUPPORTED
-#define PNG_WRITE_cHRM_SUPPORTED
-#define PNG_WRITE_eXIf_SUPPORTED
-#define PNG_WRITE_gAMA_SUPPORTED
-#define PNG_WRITE_hIST_SUPPORTED
-#define PNG_WRITE_iCCP_SUPPORTED
-#define PNG_WRITE_iTXt_SUPPORTED
-#define PNG_WRITE_oFFs_SUPPORTED
-#define PNG_WRITE_pCAL_SUPPORTED
-#define PNG_WRITE_pHYs_SUPPORTED
-#define PNG_WRITE_sBIT_SUPPORTED
-#define PNG_WRITE_sCAL_SUPPORTED
-#define PNG_WRITE_sPLT_SUPPORTED
-#define PNG_WRITE_sRGB_SUPPORTED
-#define PNG_WRITE_tEXt_SUPPORTED
-#define PNG_WRITE_tIME_SUPPORTED
-#define PNG_WRITE_tRNS_SUPPORTED
-#define PNG_WRITE_zTXt_SUPPORTED
-#define PNG_bKGD_SUPPORTED
-#define PNG_cHRM_SUPPORTED
-#define PNG_eXIf_SUPPORTED
-#define PNG_gAMA_SUPPORTED
-#define PNG_hIST_SUPPORTED
-#define PNG_iCCP_SUPPORTED
-#define PNG_iTXt_SUPPORTED
-#define PNG_oFFs_SUPPORTED
-#define PNG_pCAL_SUPPORTED
-#define PNG_pHYs_SUPPORTED
-#define PNG_sBIT_SUPPORTED
-#define PNG_sCAL_SUPPORTED
-#define PNG_sPLT_SUPPORTED
-#define PNG_sRGB_SUPPORTED
-#define PNG_tEXt_SUPPORTED
-#define PNG_tIME_SUPPORTED
-#define PNG_tRNS_SUPPORTED
-#define PNG_zTXt_SUPPORTED
-/* end of options */
-/* settings */
-#define PNG_API_RULE 0
-#define PNG_DEFAULT_READ_MACROS 1
-#define PNG_GAMMA_THRESHOLD_FIXED 5000
-#define PNG_IDAT_READ_SIZE PNG_ZBUF_SIZE
-#define PNG_INFLATE_BUF_SIZE 1024
-#define PNG_LINKAGE_API extern
-#define PNG_LINKAGE_CALLBACK extern
-#define PNG_LINKAGE_DATA extern
-#define PNG_LINKAGE_FUNCTION extern
-#define PNG_MAX_GAMMA_8 11
-#define PNG_QUANTIZE_BLUE_BITS 5
-#define PNG_QUANTIZE_GREEN_BITS 5
-#define PNG_QUANTIZE_RED_BITS 5
-#define PNG_TEXT_Z_DEFAULT_COMPRESSION (-1)
-#define PNG_TEXT_Z_DEFAULT_STRATEGY 0
-#define PNG_USER_CHUNK_CACHE_MAX 1000
-#define PNG_USER_CHUNK_MALLOC_MAX 8000000
-#define PNG_USER_HEIGHT_MAX 1000000
-#define PNG_USER_WIDTH_MAX 1000000
-#define PNG_ZBUF_SIZE 8192
-#define PNG_ZLIB_VERNUM 0 /* unknown */
-#define PNG_Z_DEFAULT_COMPRESSION (-1)
-#define PNG_Z_DEFAULT_NOFILTER_STRATEGY 0
-#define PNG_Z_DEFAULT_STRATEGY 1
-#define PNG_sCAL_PRECISION 5
-#define PNG_sRGB_PROFILE_CHECKS 2
-/* end of settings */
-#endif /* PNGLCONF_H */
diff --git a/src/png/libpng/scripts/prefix.c b/src/png/libpng/scripts/prefix.c
deleted file mode 100644
index 8b604a091..000000000
--- a/src/png/libpng/scripts/prefix.c
+++ /dev/null
@@ -1,24 +0,0 @@
-
-/* prefix.c - generate an unprefixed symbol list
- *
- * Last changed in libpng version 1.6.16 [December 22, 2014]
- * Copyright (c) 2013-2014 Glenn Randers-Pehrson
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#define PNG_EXPORTA(ordinal, type, name, args, attributes)\
-        PNG_DFN "@" name "@"
-
-/* The configuration information *before* the additional of symbol renames,
- * the list is the C name list; no symbol prefix.
- */
-#include "pnglibconf.out"
-
-PNG_DFN_START_SORT 1
-
-#include "../png.h"
-
-PNG_DFN_END_SORT
diff --git a/src/png/libpng/scripts/sym.c b/src/png/libpng/scripts/sym.c
deleted file mode 100644
index ea9e4c507..000000000
--- a/src/png/libpng/scripts/sym.c
+++ /dev/null
@@ -1,15 +0,0 @@
-
-/* sym.c - define format of libpng.sym
- *
- * Last changed in libpng version 1.6.16 [December 22, 2014]
- * Copyright (c) 2011-2014 Glenn Randers-Pehrson
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#define PNG_EXPORTA(ordinal, type, name, args, attributes)\
-        PNG_DFN "@" SYMBOL_PREFIX "@@" name "@"
-
-#include "../png.h"
diff --git a/src/png/libpng/scripts/symbols.c b/src/png/libpng/scripts/symbols.c
deleted file mode 100644
index 28b841d8b..000000000
--- a/src/png/libpng/scripts/symbols.c
+++ /dev/null
@@ -1,58 +0,0 @@
-
-/* symbols.c - find all exported symbols
- *
- * Last changed in libpng version 1.6.16 [December 22, 2014]
- * Copyright (c) 2011-2014 Glenn Randers-Pehrson
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-/* NOTE: making 'symbols.chk' checks both that the exported
- * symbols in the library don't change and (implicitly) that
- * scripts/pnglibconf.h.prebuilt is as expected.
- * If scripts/pnglibconf.h.prebuilt is remade using
- * scripts/pnglibconf.dfa then this checks the .dfa file too.
- */
-
-#define PNG_EXPORTA(ordinal, type, name, args, attributes)\
-        PNG_DFN "@" name "@ @@" ordinal "@"
-#define PNG_REMOVED(ordinal, type, name, args, attributes)\
-        PNG_DFN "; @" name "@ @@" ordinal "@"
-#define PNG_EXPORT_LAST_ORDINAL(ordinal)\
-        PNG_DFN "; @@" ordinal "@"
-
-/* Read the defaults, but use scripts/pnglibconf.h.prebuilt; the 'standard'
- * header file.
- */
-#include "pnglibconf.h.prebuilt"
-#include "../png.h"
-
-/* Some things are turned off by default.  Turn these things
- * on here (by hand) to get the APIs they expose and validate
- * that no harm is done.  This list is the set of options
- * defaulted to 'off' in scripts/pnglibconf.dfa
- *
- * Maintenance: if scripts/pnglibconf.dfa options are changed
- * from, or to, 'disabled' this needs updating!
- */
-#define PNG_BENIGN_ERRORS_SUPPORTED
-#define PNG_ERROR_NUMBERS_SUPPORTED
-#define PNG_READ_BIG_ENDIAN_SUPPORTED  /* should do nothing! */
-#define PNG_INCH_CONVERSIONS_SUPPORTED
-#define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
-#define PNG_SET_OPTION_SUPPORTED
-
-#undef PNG_H
-#include "../png.h"
-
-/* Finally there are a couple of places where option support
- * actually changes the APIs revealed using a #if/#else/#endif
- * test in png.h, test these here.
- */
-#undef  PNG_FLOATING_POINT_SUPPORTED /* Exposes 'fixed' APIs */
-#undef  PNG_ERROR_TEXT_SUPPORTED     /* Exposes unsupported APIs */
-
-#undef PNG_H
-#include "../png.h"
diff --git a/src/png/libpng/scripts/symbols.def b/src/png/libpng/scripts/symbols.def
deleted file mode 100644
index 4a3c3ff41..000000000
--- a/src/png/libpng/scripts/symbols.def
+++ /dev/null
@@ -1,256 +0,0 @@
-;Version 1.6.35beta02
-;--------------------------------------------------------------
-; LIBPNG symbol list as a Win32 DEF file
-; Contains all the symbols that can be exported from libpng
-;--------------------------------------------------------------
-LIBRARY
-
-EXPORTS
- png_access_version_number @1
- png_set_sig_bytes @2
- png_sig_cmp @3
- png_create_read_struct @4
- png_create_write_struct @5
- png_get_compression_buffer_size @6
- png_set_compression_buffer_size @7
- png_set_longjmp_fn @8
- png_longjmp @9
- png_reset_zstream @10
- png_create_read_struct_2 @11
- png_create_write_struct_2 @12
- png_write_sig @13
- png_write_chunk @14
- png_write_chunk_start @15
- png_write_chunk_data @16
- png_write_chunk_end @17
- png_create_info_struct @18
- png_info_init_3 @19
- png_write_info_before_PLTE @20
- png_write_info @21
- png_read_info @22
- png_convert_to_rfc1123 @23
- png_convert_from_struct_tm @24
- png_convert_from_time_t @25
- png_set_expand @26
- png_set_expand_gray_1_2_4_to_8 @27
- png_set_palette_to_rgb @28
- png_set_tRNS_to_alpha @29
- png_set_bgr @30
- png_set_gray_to_rgb @31
- png_set_rgb_to_gray @32
- png_set_rgb_to_gray_fixed @33
- png_get_rgb_to_gray_status @34
- png_build_grayscale_palette @35
- png_set_strip_alpha @36
- png_set_swap_alpha @37
- png_set_invert_alpha @38
- png_set_filler @39
- png_set_add_alpha @40
- png_set_swap @41
- png_set_packing @42
- png_set_packswap @43
- png_set_shift @44
- png_set_interlace_handling @45
- png_set_invert_mono @46
- png_set_background @47
- png_set_strip_16 @48
- png_set_quantize @49
- png_set_gamma @50
- png_set_flush @51
- png_write_flush @52
- png_start_read_image @53
- png_read_update_info @54
- png_read_rows @55
- png_read_row @56
- png_read_image @57
- png_write_row @58
- png_write_rows @59
- png_write_image @60
- png_write_end @61
- png_read_end @62
- png_destroy_info_struct @63
- png_destroy_read_struct @64
- png_destroy_write_struct @65
- png_set_crc_action @66
- png_set_filter @67
- png_set_filter_heuristics @68
- png_set_compression_level @69
- png_set_compression_mem_level @70
- png_set_compression_strategy @71
- png_set_compression_window_bits @72
- png_set_compression_method @73
- png_init_io @74
- png_set_error_fn @75
- png_get_error_ptr @76
- png_set_write_fn @77
- png_set_read_fn @78
- png_get_io_ptr @79
- png_set_read_status_fn @80
- png_set_write_status_fn @81
- png_set_mem_fn @82
- png_get_mem_ptr @83
- png_set_read_user_transform_fn @84
- png_set_write_user_transform_fn @85
- png_set_user_transform_info @86
- png_get_user_transform_ptr @87
- png_set_read_user_chunk_fn @88
- png_get_user_chunk_ptr @89
- png_set_progressive_read_fn @90
- png_get_progressive_ptr @91
- png_process_data @92
- png_progressive_combine_row @93
- png_malloc @94
- png_calloc @95
- png_malloc_warn @96
- png_free @97
- png_free_data @98
- png_data_freer @99
- png_malloc_default @100
- png_free_default @101
- png_error @102
- png_chunk_error @103
- png_err @104
- png_warning @105
- png_chunk_warning @106
- png_benign_error @107
- png_chunk_benign_error @108
- png_set_benign_errors @109
- png_get_valid @110
- png_get_rowbytes @111
- png_get_rows @112
- png_set_rows @113
- png_get_channels @114
- png_get_image_width @115
- png_get_image_height @116
- png_get_bit_depth @117
- png_get_color_type @118
- png_get_filter_type @119
- png_get_interlace_type @120
- png_get_compression_type @121
- png_get_pixels_per_meter @122
- png_get_x_pixels_per_meter @123
- png_get_y_pixels_per_meter @124
- png_get_pixel_aspect_ratio @125
- png_get_x_offset_pixels @126
- png_get_y_offset_pixels @127
- png_get_x_offset_microns @128
- png_get_y_offset_microns @129
- png_get_signature @130
- png_get_bKGD @131
- png_set_bKGD @132
- png_get_cHRM @133
- png_get_cHRM_fixed @134
- png_set_cHRM @135
- png_set_cHRM_fixed @136
- png_get_gAMA @137
- png_get_gAMA_fixed @138
- png_set_gAMA @139
- png_set_gAMA_fixed @140
- png_get_hIST @141
- png_set_hIST @142
- png_get_IHDR @143
- png_set_IHDR @144
- png_get_oFFs @145
- png_set_oFFs @146
- png_get_pCAL @147
- png_set_pCAL @148
- png_get_pHYs @149
- png_set_pHYs @150
- png_get_PLTE @151
- png_set_PLTE @152
- png_get_sBIT @153
- png_set_sBIT @154
- png_get_sRGB @155
- png_set_sRGB @156
- png_set_sRGB_gAMA_and_cHRM @157
- png_get_iCCP @158
- png_set_iCCP @159
- png_get_sPLT @160
- png_set_sPLT @161
- png_get_text @162
- png_set_text @163
- png_get_tIME @164
- png_set_tIME @165
- png_get_tRNS @166
- png_set_tRNS @167
- png_get_sCAL @168
- png_get_sCAL_s @169
- png_set_sCAL @170
- png_set_sCAL_s @171
- png_set_keep_unknown_chunks @172
- png_handle_as_unknown @173
- png_set_unknown_chunks @174
- png_set_unknown_chunk_location @175
- png_get_unknown_chunks @176
- png_set_invalid @177
- png_read_png @178
- png_write_png @179
- png_get_copyright @180
- png_get_header_ver @181
- png_get_header_version @182
- png_get_libpng_ver @183
- png_permit_mng_features @184
- png_set_strip_error_numbers @185
- png_set_user_limits @186
- png_get_user_width_max @187
- png_get_user_height_max @188
- png_set_chunk_cache_max @189
- png_get_chunk_cache_max @190
- png_set_chunk_malloc_max @191
- png_get_chunk_malloc_max @192
- png_get_pixels_per_inch @193
- png_get_x_pixels_per_inch @194
- png_get_y_pixels_per_inch @195
- png_get_x_offset_inches @196
- png_get_y_offset_inches @197
- png_get_pHYs_dpi @198
- png_get_io_state @199
- png_get_uint_32 @201
- png_get_uint_16 @202
- png_get_int_32 @203
- png_get_uint_31 @204
- png_save_uint_32 @205
- png_save_int_32 @206
- png_save_uint_16 @207
- png_set_gamma_fixed @208
- png_set_filter_heuristics_fixed @209
- png_get_pixel_aspect_ratio_fixed @210
- png_get_x_offset_inches_fixed @211
- png_get_y_offset_inches_fixed @212
- png_set_sCAL_fixed @213
- png_get_sCAL_fixed @214
- png_set_background_fixed @215
- png_get_io_chunk_type @216
- png_get_current_row_number @217
- png_get_current_pass_number @218
- png_process_data_pause @219
- png_process_data_skip @220
- png_set_expand_16 @221
- png_set_text_compression_level @222
- png_set_text_compression_mem_level @223
- png_set_text_compression_strategy @224
- png_set_text_compression_window_bits @225
- png_set_text_compression_method @226
- png_set_alpha_mode @227
- png_set_alpha_mode_fixed @228
- png_set_scale_16 @229
- png_get_cHRM_XYZ @230
- png_get_cHRM_XYZ_fixed @231
- png_set_cHRM_XYZ @232
- png_set_cHRM_XYZ_fixed @233
- png_image_begin_read_from_file @234
- png_image_begin_read_from_stdio @235
- png_image_begin_read_from_memory @236
- png_image_finish_read @237
- png_image_free @238
- png_image_write_to_file @239
- png_image_write_to_stdio @240
- png_convert_to_rfc1123_buffer @241
- png_set_check_for_invalid_index @242
- png_get_palette_max @243
- png_set_option @244
- png_image_write_to_memory @245
- png_get_eXIf @246
- png_set_eXIf @247
- png_get_eXIf_1 @248
- png_set_eXIf_1 @249
diff --git a/src/png/libpng/scripts/test.cmake.in b/src/png/libpng/scripts/test.cmake.in
deleted file mode 100644
index fa6a889bb..000000000
--- a/src/png/libpng/scripts/test.cmake.in
+++ /dev/null
@@ -1,31 +0,0 @@
-# test.cmake.in
-
-# Copyright (C) 2016 Glenn Randers-Pehrson
-# Written by Roger Leigh, 2016
-
-# This code is released under the libpng license.
-# For conditions of distribution and use, see the disclaimer
-# and license in png.h
-
-set(TEST_OPTIONS "@TEST_OPTIONS@")
-set(TEST_FILES "@TEST_FILES@")
-
-foreach(file ${TEST_FILES})
-  file(TO_NATIVE_PATH "${file}" native_file)
-  list(APPEND NATIVE_TEST_FILES "${native_file}")
-endforeach()
-
-# Add the directory containing libpng to the PATH (Windows only)
-if(WIN32)
-  get_filename_component(LIBPNG_DIR "${LIBPNG}" PATH)
-  file(TO_NATIVE_PATH "${LIBPNG_DIR}" LIBPNG_DIR)
-  set(ENV{PATH} "${LIBPNG_DIR};$ENV{PATH}")
-endif()
-
-execute_process(COMMAND "${CMAKE_COMMAND}" -E echo "Running ${TEST_COMMAND}" ${TEST_OPTIONS} ${NATIVE_TEST_FILES})
-
-execute_process(COMMAND "${TEST_COMMAND}" ${TEST_OPTIONS} ${NATIVE_TEST_FILES}
-                RESULT_VARIABLE TEST_STATUS)
-if(TEST_STATUS)
-  message(FATAL_ERROR "Returned failed status ${TEST_STATUS}!")
-endif()
diff --git a/src/png/libpng/scripts/vers.c b/src/png/libpng/scripts/vers.c
deleted file mode 100644
index de7319716..000000000
--- a/src/png/libpng/scripts/vers.c
+++ /dev/null
@@ -1,19 +0,0 @@
-
-/* vers.c - define format of libpng.vers
- *
- * Last changed in libpng version 1.6.16 [December 22, 2014]
- * Copyright (c) 2011-2014 Glenn Randers-Pehrson
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#define PNG_EXPORTA(ordinal, type, name, args, attributes)\
-        PNG_DFN " @" SYMBOL_PREFIX "@@" name "@;"
-
-PNG_DFN "@" PNGLIB_LIBNAME "@ {global:"
-
-#include "../png.h"
-
-PNG_DFN "local: *; };"
diff --git a/src/png/palette.hpp b/src/png/palette.hpp
deleted file mode 100644
index 917f28007..000000000
--- a/src/png/palette.hpp
+++ /dev/null
@@ -1,48 +0,0 @@
-/*
- * Copyright (C) 2007,2008   Alex Shulgin
- *
- * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
- * software; the exact copying conditions are as follows:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef PNGPP_PALETTE_HPP_INCLUDED
-#define PNGPP_PALETTE_HPP_INCLUDED
-
-#include <vector>
-#include "color.hpp"
-
-namespace png
-{
-
-    /**
-     * \brief The palette type.  Currently implemented as \c std::vector
-     * of png::color.
-     */
-    typedef std::vector< color > palette;
-
-} // namespace png
-
-#endif // PNGPP_PALETTE_HPP_INCLUDED
diff --git a/src/png/pixel_traits.hpp b/src/png/pixel_traits.hpp
deleted file mode 100644
index 8ffdfeedb..000000000
--- a/src/png/pixel_traits.hpp
+++ /dev/null
@@ -1,103 +0,0 @@
-/*
- * Copyright (C) 2007,2008   Alex Shulgin
- *
- * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
- * software; the exact copying conditions are as follows:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef PNGPP_PIXEL_TRAITS_HPP_INCLUDED
-#define PNGPP_PIXEL_TRAITS_HPP_INCLUDED
-
-#include <limits>
-#include "types.hpp"
-
-namespace png
-{
-
-    /**
-     * \brief Pixel traits class template.
-     *
-     * Provides information about pixel color type and components bit depth.
-     * Not implemented--see specializations.
-     *
-     * \see  pixel_traits<rgb_pixel>, pixel_traits<rgba_pixel>
-     */
-    template< typename pixel > struct pixel_traits;
-
-    /**
-     * \brief Basic pixel traits class template.
-     *
-     * Provides common implementation for various pixel_traits<>
-     * specializations.
-     */
-    template< typename pixel,
-              typename component,
-              color_type pixel_color_type,
-              int channels_value = sizeof(pixel) / sizeof(component),
-              int bit_depth_value = std::numeric_limits< component >::digits >
-    struct basic_pixel_traits
-    {
-        typedef pixel pixel_type;
-        typedef component component_type;
-
-        static color_type get_color_type()
-        {
-            return pixel_color_type;
-        }
-        
-        static const int channels = channels_value;
-        static int get_channels()
-        {
-            return channels;
-        }
-        
-        static const int bit_depth = bit_depth_value;
-        static int get_bit_depth()
-        {
-            return bit_depth;
-        }
-    };
-
-    /**
-     * \brief Basic pixel traits class template for pixels with alpha
-     * channel.
-     */
-    template< typename component >
-    struct basic_alpha_pixel_traits
-    {
-        /**
-         * \brief Returns the default alpha channel filler for full
-         * opacity.
-         */
-        static component get_alpha_filler()
-        {
-            return std::numeric_limits< component >::max();
-        }
-    };
-
-} // namespace png
-
-#endif // PNGPP_PIXEL_TRAITS_HPP_INCLUDED
diff --git a/src/png/tRNS.hpp b/src/png/tRNS.hpp
deleted file mode 100644
index ff0181643..000000000
--- a/src/png/tRNS.hpp
+++ /dev/null
@@ -1,48 +0,0 @@
-/*
- * Copyright (C) 2007,2008   Alex Shulgin
- *
- * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
- * software; the exact copying conditions are as follows:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef PNGPP_TRNS_HPP_INCLUDED
-#define PNGPP_TRNS_HPP_INCLUDED
-
-#include <vector>
-#include "color.hpp"
-
-namespace png
-{
-
-    /**
-     * \brief The palette transparency map type.  Currently
-     * implemented as \c std::vector of png::byte.
-     */
-    typedef std::vector< byte > tRNS;
-
-} // namespace png
-
-#endif // PNGPP_TRNS_HPP_INCLUDED
diff --git a/src/png/types.hpp b/src/png/types.hpp
deleted file mode 100644
index 1538d6bd2..000000000
--- a/src/png/types.hpp
+++ /dev/null
@@ -1,120 +0,0 @@
-/*
- * Copyright (C) 2007,2008   Alex Shulgin
- *
- * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
- * software; the exact copying conditions are as follows:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef PNGPP_TYPES_HPP_INCLUDED
-#define PNGPP_TYPES_HPP_INCLUDED
-
-#include <png.h>
-
-namespace png
-{
-
-    typedef png_byte byte;
-    typedef png_uint_16 uint_16;
-    typedef png_uint_32 uint_32;
-    typedef png_fixed_point fixed_point;
-    typedef png_color_8 color_info;
-    typedef png_color_16 color_info_16;
-
-    enum color_type
-    {
-        color_type_none       = -1,
-        color_type_gray       = PNG_COLOR_TYPE_GRAY,
-        color_type_palette    = PNG_COLOR_TYPE_PALETTE,
-        color_type_rgb        = PNG_COLOR_TYPE_RGB,
-        color_type_rgb_alpha  = PNG_COLOR_TYPE_RGB_ALPHA,
-        color_type_gray_alpha = PNG_COLOR_TYPE_GRAY_ALPHA,
-        color_type_rgba       = PNG_COLOR_TYPE_RGBA,
-        color_type_ga         = PNG_COLOR_TYPE_GA
-    };
-
-    enum color_mask
-    {
-        color_mask_palette = PNG_COLOR_MASK_PALETTE,
-        color_mask_color   = PNG_COLOR_MASK_COLOR,
-        color_mask_rgb     = color_mask_color,
-        color_mask_alpha   = PNG_COLOR_MASK_ALPHA
-    };
-
-    enum filler_type
-    {
-        filler_before = PNG_FILLER_BEFORE,
-        filler_after  = PNG_FILLER_AFTER
-    };
-
-    enum rgb_to_gray_error_action
-    {
-        rgb_to_gray_silent  = 1,
-        rgb_to_gray_warning = 2,
-        rgb_to_gray_error   = 3
-    };
-
-    enum interlace_type
-    {
-        interlace_none  = PNG_INTERLACE_NONE,
-        interlace_adam7 = PNG_INTERLACE_ADAM7
-    };
-
-    enum compression_type
-    {
-        compression_type_base    = PNG_COMPRESSION_TYPE_BASE,
-        compression_type_default = PNG_COMPRESSION_TYPE_DEFAULT
-    };
-
-    enum filter_type
-    {
-        filter_type_base        = PNG_FILTER_TYPE_BASE,
-        intrapixel_differencing = PNG_INTRAPIXEL_DIFFERENCING,
-        filter_type_default     = PNG_FILTER_TYPE_DEFAULT
-    };
-
-    enum chunk
-    {
-        chunk_gAMA = PNG_INFO_gAMA,
-        chunk_sBIT = PNG_INFO_sBIT,
-        chunk_cHRM = PNG_INFO_cHRM,
-        chunk_PLTE = PNG_INFO_PLTE,
-        chunk_tRNS = PNG_INFO_tRNS,
-        chunk_bKGD = PNG_INFO_bKGD,
-        chunk_hIST = PNG_INFO_hIST,
-        chunk_pHYs = PNG_INFO_pHYs,
-        chunk_oFFs = PNG_INFO_oFFs,
-        chunk_tIME = PNG_INFO_tIME,
-        chunk_pCAL = PNG_INFO_pCAL,
-        chunk_sRGB = PNG_INFO_sRGB,
-        chunk_iCCP = PNG_INFO_iCCP,
-        chunk_sPLT = PNG_INFO_sPLT,
-        chunk_sCAL = PNG_INFO_sCAL,
-        chunk_IDAT = PNG_INFO_IDAT
-    };
-
-} // namespace png
-
-#endif // PNGPP_TYPES_HPP_INCLUDED
diff --git a/src/png/writer.hpp b/src/png/writer.hpp
deleted file mode 100644
index 448dfd50b..000000000
--- a/src/png/writer.hpp
+++ /dev/null
@@ -1,199 +0,0 @@
-/*
- * Copyright (C) 2007,2008   Alex Shulgin
- *
- * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
- * software; the exact copying conditions are as follows:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef PNGPP_WRITER_HPP_INCLUDED
-#define PNGPP_WRITER_HPP_INCLUDED
-
-#include <cassert>
-#include "io_base.hpp"
-
-namespace png
-{
-
-    /**
-     * \brief PNG writer class template.  This is the low-level
-     * writing interface--use image class or generator class to
-     * actually write images.
-     *
-     * The \c ostream template parameter specifies the type of output
-     * stream to work with.  The \c ostream class should implement the
-     * minimum of the following interface:
-     *
-     * \code
-     * class my_ostream
-     * {
-     * public:
-     *     void write(char const*, size_t);
-     *     void flush();
-     *     bool good();
-     * };
-     * \endcode
-     *
-     * With the semantics similar to the \c std::ostream.  Naturally,
-     * \c std::ostream fits this requirement and can be used with the
-     * writer class as is.
-     *
-     * \see image, reader, generator, io_base
-     */
-    template< class ostream >
-    class writer
-        : public io_base
-    {
-    public:
-        /**
-         * \brief Constructs a writer prepared to write PNG image into
-         * a \a stream.
-         */
-        explicit writer(ostream& stream)
-            : io_base(png_create_write_struct(PNG_LIBPNG_VER_STRING,
-                                              static_cast< io_base* >(this),
-                                              raise_error,
-                                              0))
-        {
-            png_set_write_fn(m_png, & stream, write_data, flush_data);
-        }
-
-        ~writer()
-        {
-            m_end_info.destroy();
-            png_destroy_write_struct(& m_png, m_info.get_png_info_ptr());
-        }
-
-        void write_png() const
-        {
-            if (setjmp(png_jmpbuf(m_png)))
-            {
-                throw error(m_error);
-            }
-            png_write_png(m_png,
-                          m_info.get_png_info(),
-                          /* transforms = */ 0,
-                          /* params = */ 0);
-        }
-
-        /**
-         * \brief Write info about PNG image.
-         */
-        void write_info() const
-        {
-            if (setjmp(png_jmpbuf(m_png)))
-            {
-                throw error(m_error);
-            }
-            m_info.write();
-        }
-
-        /**
-         * \brief Writes a row of image data at a time.
-         */
-        void write_row(byte* bytes)
-        {
-            if (setjmp(png_jmpbuf(m_png)))
-            {
-                throw error(m_error);
-            }
-            png_write_row(m_png, bytes);
-        }
-
-        /**
-         * \brief Reads ending info about PNG image.
-         */
-        void write_end_info() const
-        {
-            if (setjmp(png_jmpbuf(m_png)))
-            {
-                throw error(m_error);
-            }
-            m_end_info.write();
-        }
-
-    private:
-        static void write_data(png_struct* png, byte* data, png_size_t length)
-        {
-            io_base* io = static_cast< io_base* >(png_get_error_ptr(png));
-            writer* wr = static_cast< writer* >(io);
-            wr->reset_error();
-            ostream* stream = reinterpret_cast< ostream* >(png_get_io_ptr(png));
-            try
-            {
-                stream->write(reinterpret_cast< char* >(data), length);
-                if (!stream->good())
-                {
-                    wr->set_error("ostream::write() failed");
-                }
-            }
-            catch (std::exception const& error)
-            {
-                wr->set_error(error.what());
-            }
-            catch (...)
-            {
-                assert(!"caught something wrong");
-                wr->set_error("write_data: caught something wrong");
-            }
-            if (wr->is_error())
-            {
-                wr->raise_error();
-            }
-        }
-
-        static void flush_data(png_struct* png)
-        {
-            io_base* io = static_cast< io_base* >(png_get_error_ptr(png));
-            writer* wr = static_cast< writer* >(io);
-            wr->reset_error();
-            ostream* stream = reinterpret_cast< ostream* >(png_get_io_ptr(png));
-            try
-            {
-                stream->flush();
-                if (!stream->good())
-                {
-                    wr->set_error("ostream::flush() failed");
-                }
-            }
-            catch (std::exception const& error)
-            {
-                wr->set_error(error.what());
-            }
-            catch (...)
-            {
-                assert(!"caught something wrong");
-                wr->set_error("flush_data: caught something wrong");
-            }
-            if (wr->is_error())
-            {
-                wr->raise_error();
-            }
-        }
-    };
-
-} // namespace png
-
-#endif // PNGPP_WRITER_HPP_INCLUDED
diff --git a/src/png/zlib/CMakeLists.txt b/src/png/zlib/CMakeLists.txt
deleted file mode 100644
index 1ea38fef1..000000000
--- a/src/png/zlib/CMakeLists.txt
+++ /dev/null
@@ -1,253 +0,0 @@
-cmake_minimum_required(VERSION 2.4.4)
-set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS ON)
-
-project(zlib C)
-
-set(VERSION "1.2.11")
-
-option(ASM686 "Enable building i686 assembly implementation")
-option(AMD64 "Enable building amd64 assembly implementation")
-
-set(INSTALL_BIN_DIR "${CMAKE_INSTALL_PREFIX}/bin" CACHE PATH "Installation directory for executables")
-set(INSTALL_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib" CACHE PATH "Installation directory for libraries")
-set(INSTALL_INC_DIR "${CMAKE_INSTALL_PREFIX}/include" CACHE PATH "Installation directory for headers")
-set(INSTALL_MAN_DIR "${CMAKE_INSTALL_PREFIX}/share/man" CACHE PATH "Installation directory for manual pages")
-set(INSTALL_PKGCONFIG_DIR "${CMAKE_INSTALL_PREFIX}/share/pkgconfig" CACHE PATH "Installation directory for pkgconfig (.pc) files")
-
-include(CheckTypeSize)
-include(CheckFunctionExists)
-include(CheckIncludeFile)
-include(CheckCSourceCompiles)
-#enable_testing()
-
-check_include_file(sys/types.h HAVE_SYS_TYPES_H)
-check_include_file(stdint.h    HAVE_STDINT_H)
-check_include_file(stddef.h    HAVE_STDDEF_H)
-
-#
-# Check to see if we have large file support
-#
-set(CMAKE_REQUIRED_DEFINITIONS -D_LARGEFILE64_SOURCE=1)
-# We add these other definitions here because CheckTypeSize.cmake
-# in CMake 2.4.x does not automatically do so and we want
-# compatibility with CMake 2.4.x.
-if(HAVE_SYS_TYPES_H)
-    list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_SYS_TYPES_H)
-endif()
-if(HAVE_STDINT_H)
-    list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_STDINT_H)
-endif()
-if(HAVE_STDDEF_H)
-    list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_STDDEF_H)
-endif()
-check_type_size(off64_t OFF64_T)
-if(HAVE_OFF64_T)
-   add_definitions(-D_LARGEFILE64_SOURCE=1)
-endif()
-set(CMAKE_REQUIRED_DEFINITIONS) # clear variable
-
-#
-# Check for fseeko
-#
-check_function_exists(fseeko HAVE_FSEEKO)
-if(NOT HAVE_FSEEKO)
-    add_definitions(-DNO_FSEEKO)
-endif()
-
-#
-# Check for unistd.h
-#
-check_include_file(unistd.h Z_HAVE_UNISTD_H)
-
-if(MSVC)
-    set(CMAKE_DEBUG_POSTFIX "d")
-    add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
-    add_definitions(-D_CRT_NONSTDC_NO_DEPRECATE)
-    include_directories(${CMAKE_CURRENT_SOURCE_DIR})
-endif()
-
-if(NOT CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR)
-    # If we're doing an out of source build and the user has a zconf.h
-    # in their source tree...
-    if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h)
-        message(STATUS "Renaming")
-        message(STATUS "    ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h")
-        message(STATUS "to 'zconf.h.included' because this file is included with zlib")
-        message(STATUS "but CMake generates it automatically in the build directory.")
-        file(RENAME ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h.included)
-  endif()
-endif()
-
-set(ZLIB_PC ${CMAKE_CURRENT_BINARY_DIR}/zlib.pc)
-configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/zlib.pc.cmakein
-		${ZLIB_PC} @ONLY)
-configure_file(	${CMAKE_CURRENT_SOURCE_DIR}/zconf.h.cmakein
-		${CMAKE_CURRENT_BINARY_DIR}/zconf.h @ONLY)
-include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_SOURCE_DIR})
-
-
-#============================================================================
-# zlib
-#============================================================================
-
-set(ZLIB_PUBLIC_HDRS
-    ${CMAKE_CURRENT_BINARY_DIR}/zconf.h
-    zlib.h
-)
-set(ZLIB_PRIVATE_HDRS
-    crc32.h
-    deflate.h
-    gzguts.h
-    inffast.h
-    inffixed.h
-    inflate.h
-    inftrees.h
-    trees.h
-    zutil.h
-)
-set(ZLIB_SRCS
-    adler32.c
-    compress.c
-    crc32.c
-    deflate.c
-    gzclose.c
-    gzlib.c
-    gzread.c
-    gzwrite.c
-    inflate.c
-    infback.c
-    inftrees.c
-    inffast.c
-    trees.c
-    uncompr.c
-    zutil.c
-)
-
-if(NOT MINGW)
-    set(ZLIB_DLL_SRCS
-        win32/zlib1.rc # If present will override custom build rule below.
-    )
-endif()
-
-if(CMAKE_COMPILER_IS_GNUCC)
-    if(ASM686)
-        set(ZLIB_ASMS contrib/asm686/match.S)
-    elseif (AMD64)
-        set(ZLIB_ASMS contrib/amd64/amd64-match.S)
-    endif ()
-
-	if(ZLIB_ASMS)
-		add_definitions(-DASMV)
-		set_source_files_properties(${ZLIB_ASMS} PROPERTIES LANGUAGE C COMPILE_FLAGS -DNO_UNDERLINE)
-	endif()
-endif()
-
-if(MSVC)
-    if(ASM686)
-		ENABLE_LANGUAGE(ASM_MASM)
-        set(ZLIB_ASMS
-			contrib/masmx86/inffas32.asm
-			contrib/masmx86/match686.asm
-		)
-    elseif (AMD64)
-		ENABLE_LANGUAGE(ASM_MASM)
-        set(ZLIB_ASMS
-			contrib/masmx64/gvmat64.asm
-			contrib/masmx64/inffasx64.asm
-		)
-    endif()
-
-	if(ZLIB_ASMS)
-		add_definitions(-DASMV -DASMINF)
-	endif()
-endif()
-
-# parse the full version number from zlib.h and include in ZLIB_FULL_VERSION
-file(READ ${CMAKE_CURRENT_SOURCE_DIR}/zlib.h _zlib_h_contents)
-string(REGEX REPLACE ".*#define[ \t]+ZLIB_VERSION[ \t]+\"([-0-9A-Za-z.]+)\".*"
-    "\\1" ZLIB_FULL_VERSION ${_zlib_h_contents})
-
-if(MINGW)
-    # This gets us DLL resource information when compiling on MinGW.
-    if(NOT CMAKE_RC_COMPILER)
-        set(CMAKE_RC_COMPILER windres.exe)
-    endif()
-
-    add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj
-                       COMMAND ${CMAKE_RC_COMPILER}
-                            -D GCC_WINDRES
-                            -I ${CMAKE_CURRENT_SOURCE_DIR}
-                            -I ${CMAKE_CURRENT_BINARY_DIR}
-                            -o ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj
-                            -i ${CMAKE_CURRENT_SOURCE_DIR}/win32/zlib1.rc)
-    set(ZLIB_DLL_SRCS ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj)
-endif(MINGW)
-
-#add_library(zlib SHARED ${ZLIB_SRCS} ${ZLIB_ASMS} ${ZLIB_DLL_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
-add_library(zlibstatic STATIC ${ZLIB_SRCS} ${ZLIB_ASMS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
-#set_target_properties(zlib PROPERTIES DEFINE_SYMBOL ZLIB_DLL)
-#set_target_properties(zlib PROPERTIES SOVERSION 1)
-
-if(NOT CYGWIN)
-    # This property causes shared libraries on Linux to have the full version
-    # encoded into their final filename.  We disable this on Cygwin because
-    # it causes cygz-${ZLIB_FULL_VERSION}.dll to be created when cygz.dll
-    # seems to be the default.
-    #
-    # This has no effect with MSVC, on that platform the version info for
-    # the DLL comes from the resource file win32/zlib1.rc
-#    set_target_properties(zlib PROPERTIES VERSION ${ZLIB_FULL_VERSION})
-endif()
-
-if(UNIX)
-    # On unix-like platforms the library is almost always called libz
-   set_target_properties(
-   # zlib 
-   zlibstatic PROPERTIES OUTPUT_NAME z)
-   if(NOT APPLE)
-     # set_target_properties(zlib PROPERTIES LINK_FLAGS "-Wl,--version-script,\"${CMAKE_CURRENT_SOURCE_DIR}/zlib.map\"")
-   endif()
-elseif(BUILD_SHARED_LIBS AND WIN32)
-    # Creates zlib1.dll when building shared library version
-    # set_target_properties(zlib PROPERTIES SUFFIX "1.dll")
-endif()
-
-if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
-    install(TARGETS
-#            zlib
-            zlibstatic
-        RUNTIME DESTINATION "${INSTALL_BIN_DIR}"
-        ARCHIVE DESTINATION "${INSTALL_LIB_DIR}"
-        LIBRARY DESTINATION "${INSTALL_LIB_DIR}" )
-endif()
-if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
-    install(FILES ${ZLIB_PUBLIC_HDRS} DESTINATION "${INSTALL_INC_DIR}")
-endif()
-if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
-    install(FILES zlib.3 DESTINATION "${INSTALL_MAN_DIR}/man3")
-endif()
-if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
-    install(FILES ${ZLIB_PC} DESTINATION "${INSTALL_PKGCONFIG_DIR}")
-endif()
-
-#============================================================================
-# Example binaries
-#============================================================================
-
-#add_executable(example test/example.c)
-#target_link_libraries(example zlib)
-#add_test(example example)
-
-#add_executable(minigzip test/minigzip.c)
-#target_link_libraries(minigzip zlib)
-
-#if(HAVE_OFF64_T)
-#    add_executable(example64 test/example.c)
-#    target_link_libraries(example64 zlib)
-#    set_target_properties(example64 PROPERTIES COMPILE_FLAGS "-D_FILE_OFFSET_BITS=64")
-#    add_test(example64 example64)
-
-#    add_executable(minigzip64 test/minigzip.c)
-#    target_link_libraries(minigzip64 zlib)
-#    set_target_properties(minigzip64 PROPERTIES COMPILE_FLAGS "-D_FILE_OFFSET_BITS=64")
-#endif()
diff --git a/src/png/zlib/ChangeLog b/src/png/zlib/ChangeLog
deleted file mode 100644
index 30199a65a..000000000
--- a/src/png/zlib/ChangeLog
+++ /dev/null
@@ -1,1515 +0,0 @@
-
-                ChangeLog file for zlib
-
-Changes in 1.2.11 (15 Jan 2017)
-- Fix deflate stored bug when pulling last block from window
-- Permit immediate deflateParams changes before any deflate input
-
-Changes in 1.2.10 (2 Jan 2017)
-- Avoid warnings on snprintf() return value
-- Fix bug in deflate_stored() for zero-length input
-- Fix bug in gzwrite.c that produced corrupt gzip files
-- Remove files to be installed before copying them in Makefile.in
-- Add warnings when compiling with assembler code
-
-Changes in 1.2.9 (31 Dec 2016)
-- Fix contrib/minizip to permit unzipping with desktop API [Zouzou]
-- Improve contrib/blast to return unused bytes
-- Assure that gzoffset() is correct when appending
-- Improve compress() and uncompress() to support large lengths
-- Fix bug in test/example.c where error code not saved
-- Remedy Coverity warning [Randers-Pehrson]
-- Improve speed of gzprintf() in transparent mode
-- Fix inflateInit2() bug when windowBits is 16 or 32
-- Change DEBUG macro to ZLIB_DEBUG
-- Avoid uninitialized access by gzclose_w()
-- Allow building zlib outside of the source directory
-- Fix bug that accepted invalid zlib header when windowBits is zero
-- Fix gzseek() problem on MinGW due to buggy _lseeki64 there
-- Loop on write() calls in gzwrite.c in case of non-blocking I/O
-- Add --warn (-w) option to ./configure for more compiler warnings
-- Reject a window size of 256 bytes if not using the zlib wrapper
-- Fix bug when level 0 used with Z_HUFFMAN or Z_RLE
-- Add --debug (-d) option to ./configure to define ZLIB_DEBUG
-- Fix bugs in creating a very large gzip header
-- Add uncompress2() function, which returns the input size used
-- Assure that deflateParams() will not switch functions mid-block
-- Dramatically speed up deflation for level 0 (storing)
-- Add gzfread(), duplicating the interface of fread()
-- Add gzfwrite(), duplicating the interface of fwrite()
-- Add deflateGetDictionary() function
-- Use snprintf() for later versions of Microsoft C
-- Fix *Init macros to use z_ prefix when requested
-- Replace as400 with os400 for OS/400 support [Monnerat]
-- Add crc32_z() and adler32_z() functions with size_t lengths
-- Update Visual Studio project files [AraHaan]
-
-Changes in 1.2.8 (28 Apr 2013)
-- Update contrib/minizip/iowin32.c for Windows RT [Vollant]
-- Do not force Z_CONST for C++
-- Clean up contrib/vstudio [Roß]
-- Correct spelling error in zlib.h
-- Fix mixed line endings in contrib/vstudio
-
-Changes in 1.2.7.3 (13 Apr 2013)
-- Fix version numbers and DLL names in contrib/vstudio/*/zlib.rc
-
-Changes in 1.2.7.2 (13 Apr 2013)
-- Change check for a four-byte type back to hexadecimal
-- Fix typo in win32/Makefile.msc
-- Add casts in gzwrite.c for pointer differences
-
-Changes in 1.2.7.1 (24 Mar 2013)
-- Replace use of unsafe string functions with snprintf if available
-- Avoid including stddef.h on Windows for Z_SOLO compile [Niessink]
-- Fix gzgetc undefine when Z_PREFIX set [Turk]
-- Eliminate use of mktemp in Makefile (not always available)
-- Fix bug in 'F' mode for gzopen()
-- Add inflateGetDictionary() function
-- Correct comment in deflate.h
-- Use _snprintf for snprintf in Microsoft C
-- On Darwin, only use /usr/bin/libtool if libtool is not Apple
-- Delete "--version" file if created by "ar --version" [Richard G.]
-- Fix configure check for veracity of compiler error return codes
-- Fix CMake compilation of static lib for MSVC2010 x64
-- Remove unused variable in infback9.c
-- Fix argument checks in gzlog_compress() and gzlog_write()
-- Clean up the usage of z_const and respect const usage within zlib
-- Clean up examples/gzlog.[ch] comparisons of different types
-- Avoid shift equal to bits in type (caused endless loop)
-- Fix uninitialized value bug in gzputc() introduced by const patches
-- Fix memory allocation error in examples/zran.c [Nor]
-- Fix bug where gzopen(), gzclose() would write an empty file
-- Fix bug in gzclose() when gzwrite() runs out of memory
-- Check for input buffer malloc failure in examples/gzappend.c
-- Add note to contrib/blast to use binary mode in stdio
-- Fix comparisons of differently signed integers in contrib/blast
-- Check for invalid code length codes in contrib/puff
-- Fix serious but very rare decompression bug in inftrees.c
-- Update inflateBack() comments, since inflate() can be faster
-- Use underscored I/O function names for WINAPI_FAMILY
-- Add _tr_flush_bits to the external symbols prefixed by --zprefix
-- Add contrib/vstudio/vc10 pre-build step for static only
-- Quote --version-script argument in CMakeLists.txt
-- Don't specify --version-script on Apple platforms in CMakeLists.txt
-- Fix casting error in contrib/testzlib/testzlib.c
-- Fix types in contrib/minizip to match result of get_crc_table()
-- Simplify contrib/vstudio/vc10 with 'd' suffix
-- Add TOP support to win32/Makefile.msc
-- Suport i686 and amd64 assembler builds in CMakeLists.txt
-- Fix typos in the use of _LARGEFILE64_SOURCE in zconf.h
-- Add vc11 and vc12 build files to contrib/vstudio
-- Add gzvprintf() as an undocumented function in zlib
-- Fix configure for Sun shell
-- Remove runtime check in configure for four-byte integer type
-- Add casts and consts to ease user conversion to C++
-- Add man pages for minizip and miniunzip
-- In Makefile uninstall, don't rm if preceding cd fails
-- Do not return Z_BUF_ERROR if deflateParam() has nothing to write
-
-Changes in 1.2.7 (2 May 2012)
-- Replace use of memmove() with a simple copy for portability
-- Test for existence of strerror
-- Restore gzgetc_ for backward compatibility with 1.2.6
-- Fix build with non-GNU make on Solaris
-- Require gcc 4.0 or later on Mac OS X to use the hidden attribute
-- Include unistd.h for Watcom C
-- Use __WATCOMC__ instead of __WATCOM__
-- Do not use the visibility attribute if NO_VIZ defined
-- Improve the detection of no hidden visibility attribute
-- Avoid using __int64 for gcc or solo compilation
-- Cast to char * in gzprintf to avoid warnings [Zinser]
-- Fix make_vms.com for VAX [Zinser]
-- Don't use library or built-in byte swaps
-- Simplify test and use of gcc hidden attribute
-- Fix bug in gzclose_w() when gzwrite() fails to allocate memory
-- Add "x" (O_EXCL) and "e" (O_CLOEXEC) modes support to gzopen()
-- Fix bug in test/minigzip.c for configure --solo
-- Fix contrib/vstudio project link errors [Mohanathas]
-- Add ability to choose the builder in make_vms.com [Schweda]
-- Add DESTDIR support to mingw32 win32/Makefile.gcc
-- Fix comments in win32/Makefile.gcc for proper usage
-- Allow overriding the default install locations for cmake
-- Generate and install the pkg-config file with cmake
-- Build both a static and a shared version of zlib with cmake
-- Include version symbols for cmake builds
-- If using cmake with MSVC, add the source directory to the includes
-- Remove unneeded EXTRA_CFLAGS from win32/Makefile.gcc [Truta]
-- Move obsolete emx makefile to old [Truta]
-- Allow the use of -Wundef when compiling or using zlib
-- Avoid the use of the -u option with mktemp
-- Improve inflate() documentation on the use of Z_FINISH
-- Recognize clang as gcc
-- Add gzopen_w() in Windows for wide character path names
-- Rename zconf.h in CMakeLists.txt to move it out of the way
-- Add source directory in CMakeLists.txt for building examples
-- Look in build directory for zlib.pc in CMakeLists.txt
-- Remove gzflags from zlibvc.def in vc9 and vc10
-- Fix contrib/minizip compilation in the MinGW environment
-- Update ./configure for Solaris, support --64 [Mooney]
-- Remove -R. from Solaris shared build (possible security issue)
-- Avoid race condition for parallel make (-j) running example
-- Fix type mismatch between get_crc_table() and crc_table
-- Fix parsing of version with "-" in CMakeLists.txt [Snider, Ziegler]
-- Fix the path to zlib.map in CMakeLists.txt
-- Force the native libtool in Mac OS X to avoid GNU libtool [Beebe]
-- Add instructions to win32/Makefile.gcc for shared install [Torri]
-
-Changes in 1.2.6.1 (12 Feb 2012)
-- Avoid the use of the Objective-C reserved name "id"
-- Include io.h in gzguts.h for Microsoft compilers
-- Fix problem with ./configure --prefix and gzgetc macro
-- Include gz_header definition when compiling zlib solo
-- Put gzflags() functionality back in zutil.c
-- Avoid library header include in crc32.c for Z_SOLO
-- Use name in GCC_CLASSIC as C compiler for coverage testing, if set
-- Minor cleanup in contrib/minizip/zip.c [Vollant]
-- Update make_vms.com [Zinser]
-- Remove unnecessary gzgetc_ function
-- Use optimized byte swap operations for Microsoft and GNU [Snyder]
-- Fix minor typo in zlib.h comments [Rzesniowiecki]
-
-Changes in 1.2.6 (29 Jan 2012)
-- Update the Pascal interface in contrib/pascal
-- Fix function numbers for gzgetc_ in zlibvc.def files
-- Fix configure.ac for contrib/minizip [Schiffer]
-- Fix large-entry detection in minizip on 64-bit systems [Schiffer]
-- Have ./configure use the compiler return code for error indication
-- Fix CMakeLists.txt for cross compilation [McClure]
-- Fix contrib/minizip/zip.c for 64-bit architectures [Dalsnes]
-- Fix compilation of contrib/minizip on FreeBSD [Marquez]
-- Correct suggested usages in win32/Makefile.msc [Shachar, Horvath]
-- Include io.h for Turbo C / Borland C on all platforms [Truta]
-- Make version explicit in contrib/minizip/configure.ac [Bosmans]
-- Avoid warning for no encryption in contrib/minizip/zip.c [Vollant]
-- Minor cleanup up contrib/minizip/unzip.c [Vollant]
-- Fix bug when compiling minizip with C++ [Vollant]
-- Protect for long name and extra fields in contrib/minizip [Vollant]
-- Avoid some warnings in contrib/minizip [Vollant]
-- Add -I../.. -L../.. to CFLAGS for minizip and miniunzip
-- Add missing libs to minizip linker command
-- Add support for VPATH builds in contrib/minizip
-- Add an --enable-demos option to contrib/minizip/configure
-- Add the generation of configure.log by ./configure
-- Exit when required parameters not provided to win32/Makefile.gcc
-- Have gzputc return the character written instead of the argument
-- Use the -m option on ldconfig for BSD systems [Tobias]
-- Correct in zlib.map when deflateResetKeep was added
-
-Changes in 1.2.5.3 (15 Jan 2012)
-- Restore gzgetc function for binary compatibility
-- Do not use _lseeki64 under Borland C++ [Truta]
-- Update win32/Makefile.msc to build test/*.c [Truta]
-- Remove old/visualc6 given CMakefile and other alternatives
-- Update AS400 build files and documentation [Monnerat]
-- Update win32/Makefile.gcc to build test/*.c [Truta]
-- Permit stronger flushes after Z_BLOCK flushes
-- Avoid extraneous empty blocks when doing empty flushes
-- Permit Z_NULL arguments to deflatePending
-- Allow deflatePrime() to insert bits in the middle of a stream
-- Remove second empty static block for Z_PARTIAL_FLUSH
-- Write out all of the available bits when using Z_BLOCK
-- Insert the first two strings in the hash table after a flush
-
-Changes in 1.2.5.2 (17 Dec 2011)
-- fix ld error: unable to find version dependency 'ZLIB_1.2.5'
-- use relative symlinks for shared libs
-- Avoid searching past window for Z_RLE strategy
-- Assure that high-water mark initialization is always applied in deflate
-- Add assertions to fill_window() in deflate.c to match comments
-- Update python link in README
-- Correct spelling error in gzread.c
-- Fix bug in gzgets() for a concatenated empty gzip stream
-- Correct error in comment for gz_make()
-- Change gzread() and related to ignore junk after gzip streams
-- Allow gzread() and related to continue after gzclearerr()
-- Allow gzrewind() and gzseek() after a premature end-of-file
-- Simplify gzseek() now that raw after gzip is ignored
-- Change gzgetc() to a macro for speed (~40% speedup in testing)
-- Fix gzclose() to return the actual error last encountered
-- Always add large file support for windows
-- Include zconf.h for windows large file support
-- Include zconf.h.cmakein for windows large file support
-- Update zconf.h.cmakein on make distclean
-- Merge vestigial vsnprintf determination from zutil.h to gzguts.h
-- Clarify how gzopen() appends in zlib.h comments
-- Correct documentation of gzdirect() since junk at end now ignored
-- Add a transparent write mode to gzopen() when 'T' is in the mode
-- Update python link in zlib man page
-- Get inffixed.h and MAKEFIXED result to match
-- Add a ./config --solo option to make zlib subset with no library use
-- Add undocumented inflateResetKeep() function for CAB file decoding
-- Add --cover option to ./configure for gcc coverage testing
-- Add #define ZLIB_CONST option to use const in the z_stream interface
-- Add comment to gzdopen() in zlib.h to use dup() when using fileno()
-- Note behavior of uncompress() to provide as much data as it can
-- Add files in contrib/minizip to aid in building libminizip
-- Split off AR options in Makefile.in and configure
-- Change ON macro to Z_ARG to avoid application conflicts
-- Facilitate compilation with Borland C++ for pragmas and vsnprintf
-- Include io.h for Turbo C / Borland C++
-- Move example.c and minigzip.c to test/
-- Simplify incomplete code table filling in inflate_table()
-- Remove code from inflate.c and infback.c that is impossible to execute
-- Test the inflate code with full coverage
-- Allow deflateSetDictionary, inflateSetDictionary at any time (in raw)
-- Add deflateResetKeep and fix inflateResetKeep to retain dictionary
-- Fix gzwrite.c to accommodate reduced memory zlib compilation
-- Have inflate() with Z_FINISH avoid the allocation of a window
-- Do not set strm->adler when doing raw inflate
-- Fix gzeof() to behave just like feof() when read is not past end of file
-- Fix bug in gzread.c when end-of-file is reached
-- Avoid use of Z_BUF_ERROR in gz* functions except for premature EOF
-- Document gzread() capability to read concurrently written files
-- Remove hard-coding of resource compiler in CMakeLists.txt [Blammo]
-
-Changes in 1.2.5.1 (10 Sep 2011)
-- Update FAQ entry on shared builds (#13)
-- Avoid symbolic argument to chmod in Makefile.in
-- Fix bug and add consts in contrib/puff [Oberhumer]
-- Update contrib/puff/zeros.raw test file to have all block types
-- Add full coverage test for puff in contrib/puff/Makefile
-- Fix static-only-build install in Makefile.in
-- Fix bug in unzGetCurrentFileInfo() in contrib/minizip [Kuno]
-- Add libz.a dependency to shared in Makefile.in for parallel builds
-- Spell out "number" (instead of "nb") in zlib.h for total_in, total_out
-- Replace $(...) with `...` in configure for non-bash sh [Bowler]
-- Add darwin* to Darwin* and solaris* to SunOS\ 5* in configure [Groffen]
-- Add solaris* to Linux* in configure to allow gcc use [Groffen]
-- Add *bsd* to Linux* case in configure [Bar-Lev]
-- Add inffast.obj to dependencies in win32/Makefile.msc
-- Correct spelling error in deflate.h [Kohler]
-- Change libzdll.a again to libz.dll.a (!) in win32/Makefile.gcc
-- Add test to configure for GNU C looking for gcc in output of $cc -v
-- Add zlib.pc generation to win32/Makefile.gcc [Weigelt]
-- Fix bug in zlib.h for _FILE_OFFSET_BITS set and _LARGEFILE64_SOURCE not
-- Add comment in zlib.h that adler32_combine with len2 < 0 makes no sense
-- Make NO_DIVIDE option in adler32.c much faster (thanks to John Reiser)
-- Make stronger test in zconf.h to include unistd.h for LFS
-- Apply Darwin patches for 64-bit file offsets to contrib/minizip [Slack]
-- Fix zlib.h LFS support when Z_PREFIX used
-- Add updated as400 support (removed from old) [Monnerat]
-- Avoid deflate sensitivity to volatile input data
-- Avoid division in adler32_combine for NO_DIVIDE
-- Clarify the use of Z_FINISH with deflateBound() amount of space
-- Set binary for output file in puff.c
-- Use u4 type for crc_table to avoid conversion warnings
-- Apply casts in zlib.h to avoid conversion warnings
-- Add OF to prototypes for adler32_combine_ and crc32_combine_ [Miller]
-- Improve inflateSync() documentation to note indeterminancy
-- Add deflatePending() function to return the amount of pending output
-- Correct the spelling of "specification" in FAQ [Randers-Pehrson]
-- Add a check in configure for stdarg.h, use for gzprintf()
-- Check that pointers fit in ints when gzprint() compiled old style
-- Add dummy name before $(SHAREDLIBV) in Makefile [Bar-Lev, Bowler]
-- Delete line in configure that adds -L. libz.a to LDFLAGS [Weigelt]
-- Add debug records in assmebler code [Londer]
-- Update RFC references to use http://tools.ietf.org/html/... [Li]
-- Add --archs option, use of libtool to configure for Mac OS X [Borstel]
-
-Changes in 1.2.5 (19 Apr 2010)
-- Disable visibility attribute in win32/Makefile.gcc [Bar-Lev]
-- Default to libdir as sharedlibdir in configure [Nieder]
-- Update copyright dates on modified source files
-- Update trees.c to be able to generate modified trees.h
-- Exit configure for MinGW, suggesting win32/Makefile.gcc
-- Check for NULL path in gz_open [Homurlu]
-
-Changes in 1.2.4.5 (18 Apr 2010)
-- Set sharedlibdir in configure [Torok]
-- Set LDFLAGS in Makefile.in [Bar-Lev]
-- Avoid mkdir objs race condition in Makefile.in [Bowler]
-- Add ZLIB_INTERNAL in front of internal inter-module functions and arrays
-- Define ZLIB_INTERNAL to hide internal functions and arrays for GNU C
-- Don't use hidden attribute when it is a warning generator (e.g. Solaris)
-
-Changes in 1.2.4.4 (18 Apr 2010)
-- Fix CROSS_PREFIX executable testing, CHOST extract, mingw* [Torok]
-- Undefine _LARGEFILE64_SOURCE in zconf.h if it is zero, but not if empty
-- Try to use bash or ksh regardless of functionality of /bin/sh
-- Fix configure incompatibility with NetBSD sh
-- Remove attempt to run under bash or ksh since have better NetBSD fix
-- Fix win32/Makefile.gcc for MinGW [Bar-Lev]
-- Add diagnostic messages when using CROSS_PREFIX in configure
-- Added --sharedlibdir option to configure [Weigelt]
-- Use hidden visibility attribute when available [Frysinger]
-
-Changes in 1.2.4.3 (10 Apr 2010)
-- Only use CROSS_PREFIX in configure for ar and ranlib if they exist
-- Use CROSS_PREFIX for nm [Bar-Lev]
-- Assume _LARGEFILE64_SOURCE defined is equivalent to true
-- Avoid use of undefined symbols in #if with && and ||
-- Make *64 prototypes in gzguts.h consistent with functions
-- Add -shared load option for MinGW in configure [Bowler]
-- Move z_off64_t to public interface, use instead of off64_t
-- Remove ! from shell test in configure (not portable to Solaris)
-- Change +0 macro tests to -0 for possibly increased portability
-
-Changes in 1.2.4.2 (9 Apr 2010)
-- Add consistent carriage returns to readme.txt's in masmx86 and masmx64
-- Really provide prototypes for *64 functions when building without LFS
-- Only define unlink() in minigzip.c if unistd.h not included
-- Update README to point to contrib/vstudio project files
-- Move projects/vc6 to old/ and remove projects/
-- Include stdlib.h in minigzip.c for setmode() definition under WinCE
-- Clean up assembler builds in win32/Makefile.msc [Rowe]
-- Include sys/types.h for Microsoft for off_t definition
-- Fix memory leak on error in gz_open()
-- Symbolize nm as $NM in configure [Weigelt]
-- Use TEST_LDSHARED instead of LDSHARED to link test programs [Weigelt]
-- Add +0 to _FILE_OFFSET_BITS and _LFS64_LARGEFILE in case not defined
-- Fix bug in gzeof() to take into account unused input data
-- Avoid initialization of structures with variables in puff.c
-- Updated win32/README-WIN32.txt [Rowe]
-
-Changes in 1.2.4.1 (28 Mar 2010)
-- Remove the use of [a-z] constructs for sed in configure [gentoo 310225]
-- Remove $(SHAREDLIB) from LIBS in Makefile.in [Creech]
-- Restore "for debugging" comment on sprintf() in gzlib.c
-- Remove fdopen for MVS from gzguts.h
-- Put new README-WIN32.txt in win32 [Rowe]
-- Add check for shell to configure and invoke another shell if needed
-- Fix big fat stinking bug in gzseek() on uncompressed files
-- Remove vestigial F_OPEN64 define in zutil.h
-- Set and check the value of _LARGEFILE_SOURCE and _LARGEFILE64_SOURCE
-- Avoid errors on non-LFS systems when applications define LFS macros
-- Set EXE to ".exe" in configure for MINGW [Kahle]
-- Match crc32() in crc32.c exactly to the prototype in zlib.h [Sherrill]
-- Add prefix for cross-compilation in win32/makefile.gcc [Bar-Lev]
-- Add DLL install in win32/makefile.gcc [Bar-Lev]
-- Allow Linux* or linux* from uname in configure [Bar-Lev]
-- Allow ldconfig to be redefined in configure and Makefile.in [Bar-Lev]
-- Add cross-compilation prefixes to configure [Bar-Lev]
-- Match type exactly in gz_load() invocation in gzread.c
-- Match type exactly of zcalloc() in zutil.c to zlib.h alloc_func
-- Provide prototypes for *64 functions when building zlib without LFS
-- Don't use -lc when linking shared library on MinGW
-- Remove errno.h check in configure and vestigial errno code in zutil.h
-
-Changes in 1.2.4 (14 Mar 2010)
-- Fix VER3 extraction in configure for no fourth subversion
-- Update zlib.3, add docs to Makefile.in to make .pdf out of it
-- Add zlib.3.pdf to distribution
-- Don't set error code in gzerror() if passed pointer is NULL
-- Apply destination directory fixes to CMakeLists.txt [Lowman]
-- Move #cmakedefine's to a new zconf.in.cmakein
-- Restore zconf.h for builds that don't use configure or cmake
-- Add distclean to dummy Makefile for convenience
-- Update and improve INDEX, README, and FAQ
-- Update CMakeLists.txt for the return of zconf.h [Lowman]
-- Update contrib/vstudio/vc9 and vc10 [Vollant]
-- Change libz.dll.a back to libzdll.a in win32/Makefile.gcc
-- Apply license and readme changes to contrib/asm686 [Raiter]
-- Check file name lengths and add -c option in minigzip.c [Li]
-- Update contrib/amd64 and contrib/masmx86/ [Vollant]
-- Avoid use of "eof" parameter in trees.c to not shadow library variable
-- Update make_vms.com for removal of zlibdefs.h [Zinser]
-- Update assembler code and vstudio projects in contrib [Vollant]
-- Remove outdated assembler code contrib/masm686 and contrib/asm586
-- Remove old vc7 and vc8 from contrib/vstudio
-- Update win32/Makefile.msc, add ZLIB_VER_SUBREVISION [Rowe]
-- Fix memory leaks in gzclose_r() and gzclose_w(), file leak in gz_open()
-- Add contrib/gcc_gvmat64 for longest_match and inflate_fast [Vollant]
-- Remove *64 functions from win32/zlib.def (they're not 64-bit yet)
-- Fix bug in void-returning vsprintf() case in gzwrite.c
-- Fix name change from inflate.h in contrib/inflate86/inffas86.c
-- Check if temporary file exists before removing in make_vms.com [Zinser]
-- Fix make install and uninstall for --static option
-- Fix usage of _MSC_VER in gzguts.h and zutil.h [Truta]
-- Update readme.txt in contrib/masmx64 and masmx86 to assemble
-
-Changes in 1.2.3.9 (21 Feb 2010)
-- Expunge gzio.c
-- Move as400 build information to old
-- Fix updates in contrib/minizip and contrib/vstudio
-- Add const to vsnprintf test in configure to avoid warnings [Weigelt]
-- Delete zconf.h (made by configure) [Weigelt]
-- Change zconf.in.h to zconf.h.in per convention [Weigelt]
-- Check for NULL buf in gzgets()
-- Return empty string for gzgets() with len == 1 (like fgets())
-- Fix description of gzgets() in zlib.h for end-of-file, NULL return
-- Update minizip to 1.1 [Vollant]
-- Avoid MSVC loss of data warnings in gzread.c, gzwrite.c
-- Note in zlib.h that gzerror() should be used to distinguish from EOF
-- Remove use of snprintf() from gzlib.c
-- Fix bug in gzseek()
-- Update contrib/vstudio, adding vc9 and vc10 [Kuno, Vollant]
-- Fix zconf.h generation in CMakeLists.txt [Lowman]
-- Improve comments in zconf.h where modified by configure
-
-Changes in 1.2.3.8 (13 Feb 2010)
-- Clean up text files (tabs, trailing whitespace, etc.) [Oberhumer]
-- Use z_off64_t in gz_zero() and gz_skip() to match state->skip
-- Avoid comparison problem when sizeof(int) == sizeof(z_off64_t)
-- Revert to Makefile.in from 1.2.3.6 (live with the clutter)
-- Fix missing error return in gzflush(), add zlib.h note
-- Add *64 functions to zlib.map [Levin]
-- Fix signed/unsigned comparison in gz_comp()
-- Use SFLAGS when testing shared linking in configure
-- Add --64 option to ./configure to use -m64 with gcc
-- Fix ./configure --help to correctly name options
-- Have make fail if a test fails [Levin]
-- Avoid buffer overrun in contrib/masmx64/gvmat64.asm [Simpson]
-- Remove assembler object files from contrib
-
-Changes in 1.2.3.7 (24 Jan 2010)
-- Always gzopen() with O_LARGEFILE if available
-- Fix gzdirect() to work immediately after gzopen() or gzdopen()
-- Make gzdirect() more precise when the state changes while reading
-- Improve zlib.h documentation in many places
-- Catch memory allocation failure in gz_open()
-- Complete close operation if seek forward in gzclose_w() fails
-- Return Z_ERRNO from gzclose_r() if close() fails
-- Return Z_STREAM_ERROR instead of EOF for gzclose() being passed NULL
-- Return zero for gzwrite() errors to match zlib.h description
-- Return -1 on gzputs() error to match zlib.h description
-- Add zconf.in.h to allow recovery from configure modification [Weigelt]
-- Fix static library permissions in Makefile.in [Weigelt]
-- Avoid warnings in configure tests that hide functionality [Weigelt]
-- Add *BSD and DragonFly to Linux case in configure [gentoo 123571]
-- Change libzdll.a to libz.dll.a in win32/Makefile.gcc [gentoo 288212]
-- Avoid access of uninitialized data for first inflateReset2 call [Gomes]
-- Keep object files in subdirectories to reduce the clutter somewhat
-- Remove default Makefile and zlibdefs.h, add dummy Makefile
-- Add new external functions to Z_PREFIX, remove duplicates, z_z_ -> z_
-- Remove zlibdefs.h completely -- modify zconf.h instead
-
-Changes in 1.2.3.6 (17 Jan 2010)
-- Avoid void * arithmetic in gzread.c and gzwrite.c
-- Make compilers happier with const char * for gz_error message
-- Avoid unused parameter warning in inflate.c
-- Avoid signed-unsigned comparison warning in inflate.c
-- Indent #pragma's for traditional C
-- Fix usage of strwinerror() in glib.c, change to gz_strwinerror()
-- Correct email address in configure for system options
-- Update make_vms.com and add make_vms.com to contrib/minizip [Zinser]
-- Update zlib.map [Brown]
-- Fix Makefile.in for Solaris 10 make of example64 and minizip64 [Torok]
-- Apply various fixes to CMakeLists.txt [Lowman]
-- Add checks on len in gzread() and gzwrite()
-- Add error message for no more room for gzungetc()
-- Remove zlib version check in gzwrite()
-- Defer compression of gzprintf() result until need to
-- Use snprintf() in gzdopen() if available
-- Remove USE_MMAP configuration determination (only used by minigzip)
-- Remove examples/pigz.c (available separately)
-- Update examples/gun.c to 1.6
-
-Changes in 1.2.3.5 (8 Jan 2010)
-- Add space after #if in zutil.h for some compilers
-- Fix relatively harmless bug in deflate_fast() [Exarevsky]
-- Fix same problem in deflate_slow()
-- Add $(SHAREDLIBV) to LIBS in Makefile.in [Brown]
-- Add deflate_rle() for faster Z_RLE strategy run-length encoding
-- Add deflate_huff() for faster Z_HUFFMAN_ONLY encoding
-- Change name of "write" variable in inffast.c to avoid library collisions
-- Fix premature EOF from gzread() in gzio.c [Brown]
-- Use zlib header window size if windowBits is 0 in inflateInit2()
-- Remove compressBound() call in deflate.c to avoid linking compress.o
-- Replace use of errno in gz* with functions, support WinCE [Alves]
-- Provide alternative to perror() in minigzip.c for WinCE [Alves]
-- Don't use _vsnprintf on later versions of MSVC [Lowman]
-- Add CMake build script and input file [Lowman]
-- Update contrib/minizip to 1.1 [Svensson, Vollant]
-- Moved nintendods directory from contrib to .
-- Replace gzio.c with a new set of routines with the same functionality
-- Add gzbuffer(), gzoffset(), gzclose_r(), gzclose_w() as part of above
-- Update contrib/minizip to 1.1b
-- Change gzeof() to return 0 on error instead of -1 to agree with zlib.h
-
-Changes in 1.2.3.4 (21 Dec 2009)
-- Use old school .SUFFIXES in Makefile.in for FreeBSD compatibility
-- Update comments in configure and Makefile.in for default --shared
-- Fix test -z's in configure [Marquess]
-- Build examplesh and minigzipsh when not testing
-- Change NULL's to Z_NULL's in deflate.c and in comments in zlib.h
-- Import LDFLAGS from the environment in configure
-- Fix configure to populate SFLAGS with discovered CFLAGS options
-- Adapt make_vms.com to the new Makefile.in [Zinser]
-- Add zlib2ansi script for C++ compilation [Marquess]
-- Add _FILE_OFFSET_BITS=64 test to make test (when applicable)
-- Add AMD64 assembler code for longest match to contrib [Teterin]
-- Include options from $SFLAGS when doing $LDSHARED
-- Simplify 64-bit file support by introducing z_off64_t type
-- Make shared object files in objs directory to work around old Sun cc
-- Use only three-part version number for Darwin shared compiles
-- Add rc option to ar in Makefile.in for when ./configure not run
-- Add -WI,-rpath,. to LDFLAGS for OSF 1 V4*
-- Set LD_LIBRARYN32_PATH for SGI IRIX shared compile
-- Protect against _FILE_OFFSET_BITS being defined when compiling zlib
-- Rename Makefile.in targets allstatic to static and allshared to shared
-- Fix static and shared Makefile.in targets to be independent
-- Correct error return bug in gz_open() by setting state [Brown]
-- Put spaces before ;;'s in configure for better sh compatibility
-- Add pigz.c (parallel implementation of gzip) to examples/
-- Correct constant in crc32.c to UL [Leventhal]
-- Reject negative lengths in crc32_combine()
-- Add inflateReset2() function to work like inflateEnd()/inflateInit2()
-- Include sys/types.h for _LARGEFILE64_SOURCE [Brown]
-- Correct typo in doc/algorithm.txt [Janik]
-- Fix bug in adler32_combine() [Zhu]
-- Catch missing-end-of-block-code error in all inflates and in puff
-    Assures that random input to inflate eventually results in an error
-- Added enough.c (calculation of ENOUGH for inftrees.h) to examples/
-- Update ENOUGH and its usage to reflect discovered bounds
-- Fix gzerror() error report on empty input file [Brown]
-- Add ush casts in trees.c to avoid pedantic runtime errors
-- Fix typo in zlib.h uncompress() description [Reiss]
-- Correct inflate() comments with regard to automatic header detection
-- Remove deprecation comment on Z_PARTIAL_FLUSH (it stays)
-- Put new version of gzlog (2.0) in examples with interruption recovery
-- Add puff compile option to permit invalid distance-too-far streams
-- Add puff TEST command options, ability to read piped input
-- Prototype the *64 functions in zlib.h when _FILE_OFFSET_BITS == 64, but
-  _LARGEFILE64_SOURCE not defined
-- Fix Z_FULL_FLUSH to truly erase the past by resetting s->strstart
-- Fix deflateSetDictionary() to use all 32K for output consistency
-- Remove extraneous #define MIN_LOOKAHEAD in deflate.c (in deflate.h)
-- Clear bytes after deflate lookahead to avoid use of uninitialized data
-- Change a limit in inftrees.c to be more transparent to Coverity Prevent
-- Update win32/zlib.def with exported symbols from zlib.h
-- Correct spelling errors in zlib.h [Willem, Sobrado]
-- Allow Z_BLOCK for deflate() to force a new block
-- Allow negative bits in inflatePrime() to delete existing bit buffer
-- Add Z_TREES flush option to inflate() to return at end of trees
-- Add inflateMark() to return current state information for random access
-- Add Makefile for NintendoDS to contrib [Costa]
-- Add -w in configure compile tests to avoid spurious warnings [Beucler]
-- Fix typos in zlib.h comments for deflateSetDictionary()
-- Fix EOF detection in transparent gzread() [Maier]
-
-Changes in 1.2.3.3 (2 October 2006)
-- Make --shared the default for configure, add a --static option
-- Add compile option to permit invalid distance-too-far streams
-- Add inflateUndermine() function which is required to enable above
-- Remove use of "this" variable name for C++ compatibility [Marquess]
-- Add testing of shared library in make test, if shared library built
-- Use ftello() and fseeko() if available instead of ftell() and fseek()
-- Provide two versions of all functions that use the z_off_t type for
-  binary compatibility -- a normal version and a 64-bit offset version,
-  per the Large File Support Extension when _LARGEFILE64_SOURCE is
-  defined; use the 64-bit versions by default when _FILE_OFFSET_BITS
-  is defined to be 64
-- Add a --uname= option to configure to perhaps help with cross-compiling
-
-Changes in 1.2.3.2 (3 September 2006)
-- Turn off silly Borland warnings [Hay]
-- Use off64_t and define _LARGEFILE64_SOURCE when present
-- Fix missing dependency on inffixed.h in Makefile.in
-- Rig configure --shared to build both shared and static [Teredesai, Truta]
-- Remove zconf.in.h and instead create a new zlibdefs.h file
-- Fix contrib/minizip/unzip.c non-encrypted after encrypted [Vollant]
-- Add treebuild.xml (see http://treebuild.metux.de/) [Weigelt]
-
-Changes in 1.2.3.1 (16 August 2006)
-- Add watcom directory with OpenWatcom make files [Daniel]
-- Remove #undef of FAR in zconf.in.h for MVS [Fedtke]
-- Update make_vms.com [Zinser]
-- Use -fPIC for shared build in configure [Teredesai, Nicholson]
-- Use only major version number for libz.so on IRIX and OSF1 [Reinholdtsen]
-- Use fdopen() (not _fdopen()) for Interix in zutil.h [Bäck]
-- Add some FAQ entries about the contrib directory
-- Update the MVS question in the FAQ
-- Avoid extraneous reads after EOF in gzio.c [Brown]
-- Correct spelling of "successfully" in gzio.c [Randers-Pehrson]
-- Add comments to zlib.h about gzerror() usage [Brown]
-- Set extra flags in gzip header in gzopen() like deflate() does
-- Make configure options more compatible with double-dash conventions
-  [Weigelt]
-- Clean up compilation under Solaris SunStudio cc [Rowe, Reinholdtsen]
-- Fix uninstall target in Makefile.in [Truta]
-- Add pkgconfig support [Weigelt]
-- Use $(DESTDIR) macro in Makefile.in [Reinholdtsen, Weigelt]
-- Replace set_data_type() with a more accurate detect_data_type() in
-  trees.c, according to the txtvsbin.txt document [Truta]
-- Swap the order of #include <stdio.h> and #include "zlib.h" in
-  gzio.c, example.c and minigzip.c [Truta]
-- Shut up annoying VS2005 warnings about standard C deprecation [Rowe,
-  Truta] (where?)
-- Fix target "clean" from win32/Makefile.bor [Truta]
-- Create .pdb and .manifest files in win32/makefile.msc [Ziegler, Rowe]
-- Update zlib www home address in win32/DLL_FAQ.txt [Truta]
-- Update contrib/masmx86/inffas32.asm for VS2005 [Vollant, Van Wassenhove]
-- Enable browse info in the "Debug" and "ASM Debug" configurations in
-  the Visual C++ 6 project, and set (non-ASM) "Debug" as default [Truta]
-- Add pkgconfig support [Weigelt]
-- Add ZLIB_VER_MAJOR, ZLIB_VER_MINOR and ZLIB_VER_REVISION in zlib.h,
-  for use in win32/zlib1.rc [Polushin, Rowe, Truta]
-- Add a document that explains the new text detection scheme to
-  doc/txtvsbin.txt [Truta]
-- Add rfc1950.txt, rfc1951.txt and rfc1952.txt to doc/ [Truta]
-- Move algorithm.txt into doc/ [Truta]
-- Synchronize FAQ with website
-- Fix compressBound(), was low for some pathological cases [Fearnley]
-- Take into account wrapper variations in deflateBound()
-- Set examples/zpipe.c input and output to binary mode for Windows
-- Update examples/zlib_how.html with new zpipe.c (also web site)
-- Fix some warnings in examples/gzlog.c and examples/zran.c (it seems
-  that gcc became pickier in 4.0)
-- Add zlib.map for Linux: "All symbols from zlib-1.1.4 remain
-  un-versioned, the patch adds versioning only for symbols introduced in
-  zlib-1.2.0 or later.  It also declares as local those symbols which are
-  not designed to be exported." [Levin]
-- Update Z_PREFIX list in zconf.in.h, add --zprefix option to configure
-- Do not initialize global static by default in trees.c, add a response
-  NO_INIT_GLOBAL_POINTERS to initialize them if needed [Marquess]
-- Don't use strerror() in gzio.c under WinCE [Yakimov]
-- Don't use errno.h in zutil.h under WinCE [Yakimov]
-- Move arguments for AR to its usage to allow replacing ar [Marot]
-- Add HAVE_VISIBILITY_PRAGMA in zconf.in.h for Mozilla [Randers-Pehrson]
-- Improve inflateInit() and inflateInit2() documentation
-- Fix structure size comment in inflate.h
-- Change configure help option from --h* to --help [Santos]
-
-Changes in 1.2.3 (18 July 2005)
-- Apply security vulnerability fixes to contrib/infback9 as well
-- Clean up some text files (carriage returns, trailing space)
-- Update testzlib, vstudio, masmx64, and masmx86 in contrib [Vollant]
-
-Changes in 1.2.2.4 (11 July 2005)
-- Add inflatePrime() function for starting inflation at bit boundary
-- Avoid some Visual C warnings in deflate.c
-- Avoid more silly Visual C warnings in inflate.c and inftrees.c for 64-bit
-  compile
-- Fix some spelling errors in comments [Betts]
-- Correct inflateInit2() error return documentation in zlib.h
-- Add zran.c example of compressed data random access to examples
-  directory, shows use of inflatePrime()
-- Fix cast for assignments to strm->state in inflate.c and infback.c
-- Fix zlibCompileFlags() in zutil.c to use 1L for long shifts [Oberhumer]
-- Move declarations of gf2 functions to right place in crc32.c [Oberhumer]
-- Add cast in trees.c t avoid a warning [Oberhumer]
-- Avoid some warnings in fitblk.c, gun.c, gzjoin.c in examples [Oberhumer]
-- Update make_vms.com [Zinser]
-- Initialize state->write in inflateReset() since copied in inflate_fast()
-- Be more strict on incomplete code sets in inflate_table() and increase
-  ENOUGH and MAXD -- this repairs a possible security vulnerability for
-  invalid inflate input.  Thanks to Tavis Ormandy and Markus Oberhumer for
-  discovering the vulnerability and providing test cases.
-- Add ia64 support to configure for HP-UX [Smith]
-- Add error return to gzread() for format or i/o error [Levin]
-- Use malloc.h for OS/2 [Necasek]
-
-Changes in 1.2.2.3 (27 May 2005)
-- Replace 1U constants in inflate.c and inftrees.c for 64-bit compile
-- Typecast fread() return values in gzio.c [Vollant]
-- Remove trailing space in minigzip.c outmode (VC++ can't deal with it)
-- Fix crc check bug in gzread() after gzungetc() [Heiner]
-- Add the deflateTune() function to adjust internal compression parameters
-- Add a fast gzip decompressor, gun.c, to examples (use of inflateBack)
-- Remove an incorrect assertion in examples/zpipe.c
-- Add C++ wrapper in infback9.h [Donais]
-- Fix bug in inflateCopy() when decoding fixed codes
-- Note in zlib.h how much deflateSetDictionary() actually uses
-- Remove USE_DICT_HEAD in deflate.c (would mess up inflate if used)
-- Add _WIN32_WCE to define WIN32 in zconf.in.h [Spencer]
-- Don't include stderr.h or errno.h for _WIN32_WCE in zutil.h [Spencer]
-- Add gzdirect() function to indicate transparent reads
-- Update contrib/minizip [Vollant]
-- Fix compilation of deflate.c when both ASMV and FASTEST [Oberhumer]
-- Add casts in crc32.c to avoid warnings [Oberhumer]
-- Add contrib/masmx64 [Vollant]
-- Update contrib/asm586, asm686, masmx86, testzlib, vstudio [Vollant]
-
-Changes in 1.2.2.2 (30 December 2004)
-- Replace structure assignments in deflate.c and inflate.c with zmemcpy to
-  avoid implicit memcpy calls (portability for no-library compilation)
-- Increase sprintf() buffer size in gzdopen() to allow for large numbers
-- Add INFLATE_STRICT to check distances against zlib header
-- Improve WinCE errno handling and comments [Chang]
-- Remove comment about no gzip header processing in FAQ
-- Add Z_FIXED strategy option to deflateInit2() to force fixed trees
-- Add updated make_vms.com [Coghlan], update README
-- Create a new "examples" directory, move gzappend.c there, add zpipe.c,
-  fitblk.c, gzlog.[ch], gzjoin.c, and zlib_how.html.
-- Add FAQ entry and comments in deflate.c on uninitialized memory access
-- Add Solaris 9 make options in configure [Gilbert]
-- Allow strerror() usage in gzio.c for STDC
-- Fix DecompressBuf in contrib/delphi/ZLib.pas [ManChesTer]
-- Update contrib/masmx86/inffas32.asm and gvmat32.asm [Vollant]
-- Use z_off_t for adler32_combine() and crc32_combine() lengths
-- Make adler32() much faster for small len
-- Use OS_CODE in deflate() default gzip header
-
-Changes in 1.2.2.1 (31 October 2004)
-- Allow inflateSetDictionary() call for raw inflate
-- Fix inflate header crc check bug for file names and comments
-- Add deflateSetHeader() and gz_header structure for custom gzip headers
-- Add inflateGetheader() to retrieve gzip headers
-- Add crc32_combine() and adler32_combine() functions
-- Add alloc_func, free_func, in_func, out_func to Z_PREFIX list
-- Use zstreamp consistently in zlib.h (inflate_back functions)
-- Remove GUNZIP condition from definition of inflate_mode in inflate.h
-  and in contrib/inflate86/inffast.S [Truta, Anderson]
-- Add support for AMD64 in contrib/inflate86/inffas86.c [Anderson]
-- Update projects/README.projects and projects/visualc6 [Truta]
-- Update win32/DLL_FAQ.txt [Truta]
-- Avoid warning under NO_GZCOMPRESS in gzio.c; fix typo [Truta]
-- Deprecate Z_ASCII; use Z_TEXT instead [Truta]
-- Use a new algorithm for setting strm->data_type in trees.c [Truta]
-- Do not define an exit() prototype in zutil.c unless DEBUG defined
-- Remove prototype of exit() from zutil.c, example.c, minigzip.c [Truta]
-- Add comment in zlib.h for Z_NO_FLUSH parameter to deflate()
-- Fix Darwin build version identification [Peterson]
-
-Changes in 1.2.2 (3 October 2004)
-- Update zlib.h comments on gzip in-memory processing
-- Set adler to 1 in inflateReset() to support Java test suite [Walles]
-- Add contrib/dotzlib [Ravn]
-- Update win32/DLL_FAQ.txt [Truta]
-- Update contrib/minizip [Vollant]
-- Move contrib/visual-basic.txt to old/ [Truta]
-- Fix assembler builds in projects/visualc6/ [Truta]
-
-Changes in 1.2.1.2 (9 September 2004)
-- Update INDEX file
-- Fix trees.c to update strm->data_type (no one ever noticed!)
-- Fix bug in error case in inflate.c, infback.c, and infback9.c [Brown]
-- Add "volatile" to crc table flag declaration (for DYNAMIC_CRC_TABLE)
-- Add limited multitasking protection to DYNAMIC_CRC_TABLE
-- Add NO_vsnprintf for VMS in zutil.h [Mozilla]
-- Don't declare strerror() under VMS [Mozilla]
-- Add comment to DYNAMIC_CRC_TABLE to use get_crc_table() to initialize
-- Update contrib/ada [Anisimkov]
-- Update contrib/minizip [Vollant]
-- Fix configure to not hardcode directories for Darwin [Peterson]
-- Fix gzio.c to not return error on empty files [Brown]
-- Fix indentation; update version in contrib/delphi/ZLib.pas and
-  contrib/pascal/zlibpas.pas [Truta]
-- Update mkasm.bat in contrib/masmx86 [Truta]
-- Update contrib/untgz [Truta]
-- Add projects/README.projects [Truta]
-- Add project for MS Visual C++ 6.0 in projects/visualc6 [Cadieux, Truta]
-- Update win32/DLL_FAQ.txt [Truta]
-- Update list of Z_PREFIX symbols in zconf.h [Randers-Pehrson, Truta]
-- Remove an unnecessary assignment to curr in inftrees.c [Truta]
-- Add OS/2 to exe builds in configure [Poltorak]
-- Remove err dummy parameter in zlib.h [Kientzle]
-
-Changes in 1.2.1.1 (9 January 2004)
-- Update email address in README
-- Several FAQ updates
-- Fix a big fat bug in inftrees.c that prevented decoding valid
-  dynamic blocks with only literals and no distance codes --
-  Thanks to "Hot Emu" for the bug report and sample file
-- Add a note to puff.c on no distance codes case.
-
-Changes in 1.2.1 (17 November 2003)
-- Remove a tab in contrib/gzappend/gzappend.c
-- Update some interfaces in contrib for new zlib functions
-- Update zlib version number in some contrib entries
-- Add Windows CE definition for ptrdiff_t in zutil.h [Mai, Truta]
-- Support shared libraries on Hurd and KFreeBSD [Brown]
-- Fix error in NO_DIVIDE option of adler32.c
-
-Changes in 1.2.0.8 (4 November 2003)
-- Update version in contrib/delphi/ZLib.pas and contrib/pascal/zlibpas.pas
-- Add experimental NO_DIVIDE #define in adler32.c
-    - Possibly faster on some processors (let me know if it is)
-- Correct Z_BLOCK to not return on first inflate call if no wrap
-- Fix strm->data_type on inflate() return to correctly indicate EOB
-- Add deflatePrime() function for appending in the middle of a byte
-- Add contrib/gzappend for an example of appending to a stream
-- Update win32/DLL_FAQ.txt [Truta]
-- Delete Turbo C comment in README [Truta]
-- Improve some indentation in zconf.h [Truta]
-- Fix infinite loop on bad input in configure script [Church]
-- Fix gzeof() for concatenated gzip files [Johnson]
-- Add example to contrib/visual-basic.txt [Michael B.]
-- Add -p to mkdir's in Makefile.in [vda]
-- Fix configure to properly detect presence or lack of printf functions
-- Add AS400 support [Monnerat]
-- Add a little Cygwin support [Wilson]
-
-Changes in 1.2.0.7 (21 September 2003)
-- Correct some debug formats in contrib/infback9
-- Cast a type in a debug statement in trees.c
-- Change search and replace delimiter in configure from % to # [Beebe]
-- Update contrib/untgz to 0.2 with various fixes [Truta]
-- Add build support for Amiga [Nikl]
-- Remove some directories in old that have been updated to 1.2
-- Add dylib building for Mac OS X in configure and Makefile.in
-- Remove old distribution stuff from Makefile
-- Update README to point to DLL_FAQ.txt, and add comment on Mac OS X
-- Update links in README
-
-Changes in 1.2.0.6 (13 September 2003)
-- Minor FAQ updates
-- Update contrib/minizip to 1.00 [Vollant]
-- Remove test of gz functions in example.c when GZ_COMPRESS defined [Truta]
-- Update POSTINC comment for 68060 [Nikl]
-- Add contrib/infback9 with deflate64 decoding (unsupported)
-- For MVS define NO_vsnprintf and undefine FAR [van Burik]
-- Add pragma for fdopen on MVS [van Burik]
-
-Changes in 1.2.0.5 (8 September 2003)
-- Add OF to inflateBackEnd() declaration in zlib.h
-- Remember start when using gzdopen in the middle of a file
-- Use internal off_t counters in gz* functions to properly handle seeks
-- Perform more rigorous check for distance-too-far in inffast.c
-- Add Z_BLOCK flush option to return from inflate at block boundary
-- Set strm->data_type on return from inflate
-    - Indicate bits unused, if at block boundary, and if in last block
-- Replace size_t with ptrdiff_t in crc32.c, and check for correct size
-- Add condition so old NO_DEFLATE define still works for compatibility
-- FAQ update regarding the Windows DLL [Truta]
-- INDEX update: add qnx entry, remove aix entry [Truta]
-- Install zlib.3 into mandir [Wilson]
-- Move contrib/zlib_dll_FAQ.txt to win32/DLL_FAQ.txt; update [Truta]
-- Adapt the zlib interface to the new DLL convention guidelines [Truta]
-- Introduce ZLIB_WINAPI macro to allow the export of functions using
-  the WINAPI calling convention, for Visual Basic [Vollant, Truta]
-- Update msdos and win32 scripts and makefiles [Truta]
-- Export symbols by name, not by ordinal, in win32/zlib.def [Truta]
-- Add contrib/ada [Anisimkov]
-- Move asm files from contrib/vstudio/vc70_32 to contrib/asm386 [Truta]
-- Rename contrib/asm386 to contrib/masmx86 [Truta, Vollant]
-- Add contrib/masm686 [Truta]
-- Fix offsets in contrib/inflate86 and contrib/masmx86/inffas32.asm
-  [Truta, Vollant]
-- Update contrib/delphi; rename to contrib/pascal; add example [Truta]
-- Remove contrib/delphi2; add a new contrib/delphi [Truta]
-- Avoid inclusion of the nonstandard <memory.h> in contrib/iostream,
-  and fix some method prototypes [Truta]
-- Fix the ZCR_SEED2 constant to avoid warnings in contrib/minizip
-  [Truta]
-- Avoid the use of backslash (\) in contrib/minizip [Vollant]
-- Fix file time handling in contrib/untgz; update makefiles [Truta]
-- Update contrib/vstudio/vc70_32 to comply with the new DLL guidelines
-  [Vollant]
-- Remove contrib/vstudio/vc15_16 [Vollant]
-- Rename contrib/vstudio/vc70_32 to contrib/vstudio/vc7 [Truta]
-- Update README.contrib [Truta]
-- Invert the assignment order of match_head and s->prev[...] in
-  INSERT_STRING [Truta]
-- Compare TOO_FAR with 32767 instead of 32768, to avoid 16-bit warnings
-  [Truta]
-- Compare function pointers with 0, not with NULL or Z_NULL [Truta]
-- Fix prototype of syncsearch in inflate.c [Truta]
-- Introduce ASMINF macro to be enabled when using an ASM implementation
-  of inflate_fast [Truta]
-- Change NO_DEFLATE to NO_GZCOMPRESS [Truta]
-- Modify test_gzio in example.c to take a single file name as a
-  parameter [Truta]
-- Exit the example.c program if gzopen fails [Truta]
-- Add type casts around strlen in example.c [Truta]
-- Remove casting to sizeof in minigzip.c; give a proper type
-  to the variable compared with SUFFIX_LEN [Truta]
-- Update definitions of STDC and STDC99 in zconf.h [Truta]
-- Synchronize zconf.h with the new Windows DLL interface [Truta]
-- Use SYS16BIT instead of __32BIT__ to distinguish between
-  16- and 32-bit platforms [Truta]
-- Use far memory allocators in small 16-bit memory models for
-  Turbo C [Truta]
-- Add info about the use of ASMV, ASMINF and ZLIB_WINAPI in
-  zlibCompileFlags [Truta]
-- Cygwin has vsnprintf [Wilson]
-- In Windows16, OS_CODE is 0, as in MSDOS [Truta]
-- In Cygwin, OS_CODE is 3 (Unix), not 11 (Windows32) [Wilson]
-
-Changes in 1.2.0.4 (10 August 2003)
-- Minor FAQ updates
-- Be more strict when checking inflateInit2's windowBits parameter
-- Change NO_GUNZIP compile option to NO_GZIP to cover deflate as well
-- Add gzip wrapper option to deflateInit2 using windowBits
-- Add updated QNX rule in configure and qnx directory [Bonnefoy]
-- Make inflate distance-too-far checks more rigorous
-- Clean up FAR usage in inflate
-- Add casting to sizeof() in gzio.c and minigzip.c
-
-Changes in 1.2.0.3 (19 July 2003)
-- Fix silly error in gzungetc() implementation [Vollant]
-- Update contrib/minizip and contrib/vstudio [Vollant]
-- Fix printf format in example.c
-- Correct cdecl support in zconf.in.h [Anisimkov]
-- Minor FAQ updates
-
-Changes in 1.2.0.2 (13 July 2003)
-- Add ZLIB_VERNUM in zlib.h for numerical preprocessor comparisons
-- Attempt to avoid warnings in crc32.c for pointer-int conversion
-- Add AIX to configure, remove aix directory [Bakker]
-- Add some casts to minigzip.c
-- Improve checking after insecure sprintf() or vsprintf() calls
-- Remove #elif's from crc32.c
-- Change leave label to inf_leave in inflate.c and infback.c to avoid
-  library conflicts
-- Remove inflate gzip decoding by default--only enable gzip decoding by
-  special request for stricter backward compatibility
-- Add zlibCompileFlags() function to return compilation information
-- More typecasting in deflate.c to avoid warnings
-- Remove leading underscore from _Capital #defines [Truta]
-- Fix configure to link shared library when testing
-- Add some Windows CE target adjustments [Mai]
-- Remove #define ZLIB_DLL in zconf.h [Vollant]
-- Add zlib.3 [Rodgers]
-- Update RFC URL in deflate.c and algorithm.txt [Mai]
-- Add zlib_dll_FAQ.txt to contrib [Truta]
-- Add UL to some constants [Truta]
-- Update minizip and vstudio [Vollant]
-- Remove vestigial NEED_DUMMY_RETURN from zconf.in.h
-- Expand use of NO_DUMMY_DECL to avoid all dummy structures
-- Added iostream3 to contrib [Schwardt]
-- Replace rewind() with fseek() for WinCE [Truta]
-- Improve setting of zlib format compression level flags
-    - Report 0 for huffman and rle strategies and for level == 0 or 1
-    - Report 2 only for level == 6
-- Only deal with 64K limit when necessary at compile time [Truta]
-- Allow TOO_FAR check to be turned off at compile time [Truta]
-- Add gzclearerr() function [Souza]
-- Add gzungetc() function
-
-Changes in 1.2.0.1 (17 March 2003)
-- Add Z_RLE strategy for run-length encoding [Truta]
-    - When Z_RLE requested, restrict matches to distance one
-    - Update zlib.h, minigzip.c, gzopen(), gzdopen() for Z_RLE
-- Correct FASTEST compilation to allow level == 0
-- Clean up what gets compiled for FASTEST
-- Incorporate changes to zconf.in.h [Vollant]
-    - Refine detection of Turbo C need for dummy returns
-    - Refine ZLIB_DLL compilation
-    - Include additional header file on VMS for off_t typedef
-- Try to use _vsnprintf where it supplants vsprintf [Vollant]
-- Add some casts in inffast.c
-- Enchance comments in zlib.h on what happens if gzprintf() tries to
-  write more than 4095 bytes before compression
-- Remove unused state from inflateBackEnd()
-- Remove exit(0) from minigzip.c, example.c
-- Get rid of all those darn tabs
-- Add "check" target to Makefile.in that does the same thing as "test"
-- Add "mostlyclean" and "maintainer-clean" targets to Makefile.in
-- Update contrib/inflate86 [Anderson]
-- Update contrib/testzlib, contrib/vstudio, contrib/minizip [Vollant]
-- Add msdos and win32 directories with makefiles [Truta]
-- More additions and improvements to the FAQ
-
-Changes in 1.2.0 (9 March 2003)
-- New and improved inflate code
-    - About 20% faster
-    - Does not allocate 32K window unless and until needed
-    - Automatically detects and decompresses gzip streams
-    - Raw inflate no longer needs an extra dummy byte at end
-    - Added inflateBack functions using a callback interface--even faster
-      than inflate, useful for file utilities (gzip, zip)
-    - Added inflateCopy() function to record state for random access on
-      externally generated deflate streams (e.g. in gzip files)
-    - More readable code (I hope)
-- New and improved crc32()
-    - About 50% faster, thanks to suggestions from Rodney Brown
-- Add deflateBound() and compressBound() functions
-- Fix memory leak in deflateInit2()
-- Permit setting dictionary for raw deflate (for parallel deflate)
-- Fix const declaration for gzwrite()
-- Check for some malloc() failures in gzio.c
-- Fix bug in gzopen() on single-byte file 0x1f
-- Fix bug in gzread() on concatenated file with 0x1f at end of buffer
-  and next buffer doesn't start with 0x8b
-- Fix uncompress() to return Z_DATA_ERROR on truncated input
-- Free memory at end of example.c
-- Remove MAX #define in trees.c (conflicted with some libraries)
-- Fix static const's in deflate.c, gzio.c, and zutil.[ch]
-- Declare malloc() and free() in gzio.c if STDC not defined
-- Use malloc() instead of calloc() in zutil.c if int big enough
-- Define STDC for AIX
-- Add aix/ with approach for compiling shared library on AIX
-- Add HP-UX support for shared libraries in configure
-- Add OpenUNIX support for shared libraries in configure
-- Use $cc instead of gcc to build shared library
-- Make prefix directory if needed when installing
-- Correct Macintosh avoidance of typedef Byte in zconf.h
-- Correct Turbo C memory allocation when under Linux
-- Use libz.a instead of -lz in Makefile (assure use of compiled library)
-- Update configure to check for snprintf or vsnprintf functions and their
-  return value, warn during make if using an insecure function
-- Fix configure problem with compile-time knowledge of HAVE_UNISTD_H that
-  is lost when library is used--resolution is to build new zconf.h
-- Documentation improvements (in zlib.h):
-    - Document raw deflate and inflate
-    - Update RFCs URL
-    - Point out that zlib and gzip formats are different
-    - Note that Z_BUF_ERROR is not fatal
-    - Document string limit for gzprintf() and possible buffer overflow
-    - Note requirement on avail_out when flushing
-    - Note permitted values of flush parameter of inflate()
-- Add some FAQs (and even answers) to the FAQ
-- Add contrib/inflate86/ for x86 faster inflate
-- Add contrib/blast/ for PKWare Data Compression Library decompression
-- Add contrib/puff/ simple inflate for deflate format description
-
-Changes in 1.1.4 (11 March 2002)
-- ZFREE was repeated on same allocation on some error conditions.
-  This creates a security problem described in
-  http://www.zlib.org/advisory-2002-03-11.txt
-- Returned incorrect error (Z_MEM_ERROR) on some invalid data
-- Avoid accesses before window for invalid distances with inflate window
-  less than 32K.
-- force windowBits > 8 to avoid a bug in the encoder for a window size
-  of 256 bytes. (A complete fix will be available in 1.1.5).
-
-Changes in 1.1.3 (9 July 1998)
-- fix "an inflate input buffer bug that shows up on rare but persistent
-  occasions" (Mark)
-- fix gzread and gztell for concatenated .gz files (Didier Le Botlan)
-- fix gzseek(..., SEEK_SET) in write mode
-- fix crc check after a gzeek (Frank Faubert)
-- fix miniunzip when the last entry in a zip file is itself a zip file
-  (J Lillge)
-- add contrib/asm586 and contrib/asm686 (Brian Raiter)
-  See http://www.muppetlabs.com/~breadbox/software/assembly.html
-- add support for Delphi 3 in contrib/delphi (Bob Dellaca)
-- add support for C++Builder 3 and Delphi 3 in contrib/delphi2 (Davide Moretti)
-- do not exit prematurely in untgz if 0 at start of block (Magnus Holmgren)
-- use macro EXTERN instead of extern to support DLL for BeOS (Sander Stoks)
-- added a FAQ file
-
-- Support gzdopen on Mac with Metrowerks (Jason Linhart)
-- Do not redefine Byte on Mac (Brad Pettit & Jason Linhart)
-- define SEEK_END too if SEEK_SET is not defined (Albert Chin-A-Young)
-- avoid some warnings with Borland C (Tom Tanner)
-- fix a problem in contrib/minizip/zip.c for 16-bit MSDOS (Gilles Vollant)
-- emulate utime() for WIN32 in contrib/untgz  (Gilles Vollant)
-- allow several arguments to configure (Tim Mooney, Frodo Looijaard)
-- use libdir and includedir in Makefile.in (Tim Mooney)
-- support shared libraries on OSF1 V4 (Tim Mooney)
-- remove so_locations in "make clean"  (Tim Mooney)
-- fix maketree.c compilation error (Glenn, Mark)
-- Python interface to zlib now in Python 1.5 (Jeremy Hylton)
-- new Makefile.riscos (Rich Walker)
-- initialize static descriptors in trees.c for embedded targets (Nick Smith)
-- use "foo-gz" in example.c for RISCOS and VMS (Nick Smith)
-- add the OS/2 files in Makefile.in too (Andrew Zabolotny)
-- fix fdopen and halloc macros for Microsoft C 6.0 (Tom Lane)
-- fix maketree.c to allow clean compilation of inffixed.h (Mark)
-- fix parameter check in deflateCopy (Gunther Nikl)
-- cleanup trees.c, use compressed_len only in debug mode (Christian Spieler)
-- Many portability patches by Christian Spieler:
-  . zutil.c, zutil.h: added "const" for zmem*
-  . Make_vms.com: fixed some typos
-  . Make_vms.com: msdos/Makefile.*: removed zutil.h from some dependency lists
-  . msdos/Makefile.msc: remove "default rtl link library" info from obj files
-  . msdos/Makefile.*: use model-dependent name for the built zlib library
-  . msdos/Makefile.emx, nt/Makefile.emx, nt/Makefile.gcc:
-     new makefiles, for emx (DOS/OS2), emx&rsxnt and mingw32 (Windows 9x / NT)
-- use define instead of typedef for Bytef also for MSC small/medium (Tom Lane)
-- replace __far with _far for better portability (Christian Spieler, Tom Lane)
-- fix test for errno.h in configure (Tim Newsham)
-
-Changes in 1.1.2 (19 March 98)
-- added contrib/minzip, mini zip and unzip based on zlib (Gilles Vollant)
-  See http://www.winimage.com/zLibDll/unzip.html
-- preinitialize the inflate tables for fixed codes, to make the code
-  completely thread safe (Mark)
-- some simplifications and slight speed-up to the inflate code (Mark)
-- fix gzeof on non-compressed files (Allan Schrum)
-- add -std1 option in configure for OSF1 to fix gzprintf (Martin Mokrejs)
-- use default value of 4K for Z_BUFSIZE for 16-bit MSDOS (Tim Wegner + Glenn)
-- added os2/Makefile.def and os2/zlib.def (Andrew Zabolotny)
-- add shared lib support for UNIX_SV4.2MP (MATSUURA Takanori)
-- do not wrap extern "C" around system includes (Tom Lane)
-- mention zlib binding for TCL in README (Andreas Kupries)
-- added amiga/Makefile.pup for Amiga powerUP SAS/C PPC (Andreas Kleinert)
-- allow "make install prefix=..." even after configure (Glenn Randers-Pehrson)
-- allow "configure --prefix $HOME" (Tim Mooney)
-- remove warnings in example.c and gzio.c (Glenn Randers-Pehrson)
-- move Makefile.sas to amiga/Makefile.sas
-
-Changes in 1.1.1 (27 Feb 98)
-- fix macros _tr_tally_* in deflate.h for debug mode  (Glenn Randers-Pehrson)
-- remove block truncation heuristic which had very marginal effect for zlib
-  (smaller lit_bufsize than in gzip 1.2.4) and degraded a little the
-  compression ratio on some files. This also allows inlining _tr_tally for
-  matches in deflate_slow.
-- added msdos/Makefile.w32 for WIN32 Microsoft Visual C++ (Bob Frazier)
-
-Changes in 1.1.0 (24 Feb 98)
-- do not return STREAM_END prematurely in inflate (John Bowler)
-- revert to the zlib 1.0.8 inflate to avoid the gcc 2.8.0 bug (Jeremy Buhler)
-- compile with -DFASTEST to get compression code optimized for speed only
-- in minigzip, try mmap'ing the input file first (Miguel Albrecht)
-- increase size of I/O buffers in minigzip.c and gzio.c (not a big gain
-  on Sun but significant on HP)
-
-- add a pointer to experimental unzip library in README (Gilles Vollant)
-- initialize variable gcc in configure (Chris Herborth)
-
-Changes in 1.0.9 (17 Feb 1998)
-- added gzputs and gzgets functions
-- do not clear eof flag in gzseek (Mark Diekhans)
-- fix gzseek for files in transparent mode (Mark Diekhans)
-- do not assume that vsprintf returns the number of bytes written (Jens Krinke)
-- replace EXPORT with ZEXPORT to avoid conflict with other programs
-- added compress2 in zconf.h, zlib.def, zlib.dnt
-- new asm code from Gilles Vollant in contrib/asm386
-- simplify the inflate code (Mark):
- . Replace ZALLOC's in huft_build() with single ZALLOC in inflate_blocks_new()
- . ZALLOC the length list in inflate_trees_fixed() instead of using stack
- . ZALLOC the value area for huft_build() instead of using stack
- . Simplify Z_FINISH check in inflate()
-
-- Avoid gcc 2.8.0 comparison bug a little differently than zlib 1.0.8
-- in inftrees.c, avoid cc -O bug on HP (Farshid Elahi)
-- in zconf.h move the ZLIB_DLL stuff earlier to avoid problems with
-  the declaration of FAR (Gilles VOllant)
-- install libz.so* with mode 755 (executable) instead of 644 (Marc Lehmann)
-- read_buf buf parameter of type Bytef* instead of charf*
-- zmemcpy parameters are of type Bytef*, not charf* (Joseph Strout)
-- do not redeclare unlink in minigzip.c for WIN32 (John Bowler)
-- fix check for presence of directories in "make install" (Ian Willis)
-
-Changes in 1.0.8 (27 Jan 1998)
-- fixed offsets in contrib/asm386/gvmat32.asm (Gilles Vollant)
-- fix gzgetc and gzputc for big endian systems (Markus Oberhumer)
-- added compress2() to allow setting the compression level
-- include sys/types.h to get off_t on some systems (Marc Lehmann & QingLong)
-- use constant arrays for the static trees in trees.c instead of computing
-  them at run time (thanks to Ken Raeburn for this suggestion). To create
-  trees.h, compile with GEN_TREES_H and run "make test".
-- check return code of example in "make test" and display result
-- pass minigzip command line options to file_compress
-- simplifying code of inflateSync to avoid gcc 2.8 bug
-
-- support CC="gcc -Wall" in configure -s (QingLong)
-- avoid a flush caused by ftell in gzopen for write mode (Ken Raeburn)
-- fix test for shared library support to avoid compiler warnings
-- zlib.lib -> zlib.dll in msdos/zlib.rc (Gilles Vollant)
-- check for TARGET_OS_MAC in addition to MACOS (Brad Pettit)
-- do not use fdopen for Metrowerks on Mac (Brad Pettit))
-- add checks for gzputc and gzputc in example.c
-- avoid warnings in gzio.c and deflate.c (Andreas Kleinert)
-- use const for the CRC table (Ken Raeburn)
-- fixed "make uninstall" for shared libraries
-- use Tracev instead of Trace in infblock.c
-- in example.c use correct compressed length for test_sync
-- suppress +vnocompatwarnings in configure for HPUX (not always supported)
-
-Changes in 1.0.7 (20 Jan 1998)
-- fix gzseek which was broken in write mode
-- return error for gzseek to negative absolute position
-- fix configure for Linux (Chun-Chung Chen)
-- increase stack space for MSC (Tim Wegner)
-- get_crc_table and inflateSyncPoint are EXPORTed (Gilles Vollant)
-- define EXPORTVA for gzprintf (Gilles Vollant)
-- added man page zlib.3 (Rick Rodgers)
-- for contrib/untgz, fix makedir() and improve Makefile
-
-- check gzseek in write mode in example.c
-- allocate extra buffer for seeks only if gzseek is actually called
-- avoid signed/unsigned comparisons (Tim Wegner, Gilles Vollant)
-- add inflateSyncPoint in zconf.h
-- fix list of exported functions in nt/zlib.dnt and mdsos/zlib.def
-
-Changes in 1.0.6 (19 Jan 1998)
-- add functions gzprintf, gzputc, gzgetc, gztell, gzeof, gzseek, gzrewind and
-  gzsetparams (thanks to Roland Giersig and Kevin Ruland for some of this code)
-- Fix a deflate bug occurring only with compression level 0 (thanks to
-  Andy Buckler for finding this one).
-- In minigzip, pass transparently also the first byte for .Z files.
-- return Z_BUF_ERROR instead of Z_OK if output buffer full in uncompress()
-- check Z_FINISH in inflate (thanks to Marc Schluper)
-- Implement deflateCopy (thanks to Adam Costello)
-- make static libraries by default in configure, add --shared option.
-- move MSDOS or Windows specific files to directory msdos
-- suppress the notion of partial flush to simplify the interface
-  (but the symbol Z_PARTIAL_FLUSH is kept for compatibility with 1.0.4)
-- suppress history buffer provided by application to simplify the interface
-  (this feature was not implemented anyway in 1.0.4)
-- next_in and avail_in must be initialized before calling inflateInit or
-  inflateInit2
-- add EXPORT in all exported functions (for Windows DLL)
-- added Makefile.nt (thanks to Stephen Williams)
-- added the unsupported "contrib" directory:
-   contrib/asm386/ by Gilles Vollant <info@winimage.com>
-        386 asm code replacing longest_match().
-   contrib/iostream/ by Kevin Ruland <kevin@rodin.wustl.edu>
-        A C++ I/O streams interface to the zlib gz* functions
-   contrib/iostream2/  by Tyge Løvset <Tyge.Lovset@cmr.no>
-        Another C++ I/O streams interface
-   contrib/untgz/  by "Pedro A. Aranda Guti\irrez" <paag@tid.es>
-        A very simple tar.gz file extractor using zlib
-   contrib/visual-basic.txt by Carlos Rios <c_rios@sonda.cl>
-        How to use compress(), uncompress() and the gz* functions from VB.
-- pass params -f (filtered data), -h (huffman only), -1 to -9 (compression
-  level) in minigzip (thanks to Tom Lane)
-
-- use const for rommable constants in deflate
-- added test for gzseek and gztell in example.c
-- add undocumented function inflateSyncPoint() (hack for Paul Mackerras)
-- add undocumented function zError to convert error code to string
-  (for Tim Smithers)
-- Allow compilation of gzio with -DNO_DEFLATE to avoid the compression code.
-- Use default memcpy for Symantec MSDOS compiler.
-- Add EXPORT keyword for check_func (needed for Windows DLL)
-- add current directory to LD_LIBRARY_PATH for "make test"
-- create also a link for libz.so.1
-- added support for FUJITSU UXP/DS (thanks to Toshiaki Nomura)
-- use $(SHAREDLIB) instead of libz.so in Makefile.in (for HPUX)
-- added -soname for Linux in configure (Chun-Chung Chen,
-- assign numbers to the exported functions in zlib.def (for Windows DLL)
-- add advice in zlib.h for best usage of deflateSetDictionary
-- work around compiler bug on Atari (cast Z_NULL in call of s->checkfn)
-- allow compilation with ANSI keywords only enabled for TurboC in large model
-- avoid "versionString"[0] (Borland bug)
-- add NEED_DUMMY_RETURN for Borland
-- use variable z_verbose for tracing in debug mode (L. Peter Deutsch).
-- allow compilation with CC
-- defined STDC for OS/2 (David Charlap)
-- limit external names to 8 chars for MVS (Thomas Lund)
-- in minigzip.c, use static buffers only for 16-bit systems
-- fix suffix check for "minigzip -d foo.gz"
-- do not return an error for the 2nd of two consecutive gzflush() (Felix Lee)
-- use _fdopen instead of fdopen for MSC >= 6.0 (Thomas Fanslau)
-- added makelcc.bat for lcc-win32 (Tom St Denis)
-- in Makefile.dj2, use copy and del instead of install and rm (Frank Donahoe)
-- Avoid expanded $Id$. Use "rcs -kb" or "cvs admin -kb" to avoid Id expansion.
-- check for unistd.h in configure (for off_t)
-- remove useless check parameter in inflate_blocks_free
-- avoid useless assignment of s->check to itself in inflate_blocks_new
-- do not flush twice in gzclose (thanks to Ken Raeburn)
-- rename FOPEN as F_OPEN to avoid clash with /usr/include/sys/file.h
-- use NO_ERRNO_H instead of enumeration of operating systems with errno.h
-- work around buggy fclose on pipes for HP/UX
-- support zlib DLL with BORLAND C++ 5.0 (thanks to Glenn Randers-Pehrson)
-- fix configure if CC is already equal to gcc
-
-Changes in 1.0.5 (3 Jan 98)
-- Fix inflate to terminate gracefully when fed corrupted or invalid data
-- Use const for rommable constants in inflate
-- Eliminate memory leaks on error conditions in inflate
-- Removed some vestigial code in inflate
-- Update web address in README
-
-Changes in 1.0.4 (24 Jul 96)
-- In very rare conditions, deflate(s, Z_FINISH) could fail to produce an EOF
-  bit, so the decompressor could decompress all the correct data but went
-  on to attempt decompressing extra garbage data. This affected minigzip too.
-- zlibVersion and gzerror return const char* (needed for DLL)
-- port to RISCOS (no fdopen, no multiple dots, no unlink, no fileno)
-- use z_error only for DEBUG (avoid problem with DLLs)
-
-Changes in 1.0.3 (2 Jul 96)
-- use z_streamp instead of z_stream *, which is now a far pointer in MSDOS
-  small and medium models; this makes the library incompatible with previous
-  versions for these models. (No effect in large model or on other systems.)
-- return OK instead of BUF_ERROR if previous deflate call returned with
-  avail_out as zero but there is nothing to do
-- added memcmp for non STDC compilers
-- define NO_DUMMY_DECL for more Mac compilers (.h files merged incorrectly)
-- define __32BIT__ if __386__ or i386 is defined (pb. with Watcom and SCO)
-- better check for 16-bit mode MSC (avoids problem with Symantec)
-
-Changes in 1.0.2 (23 May 96)
-- added Windows DLL support
-- added a function zlibVersion (for the DLL support)
-- fixed declarations using Bytef in infutil.c (pb with MSDOS medium model)
-- Bytef is define's instead of typedef'd only for Borland C
-- avoid reading uninitialized memory in example.c
-- mention in README that the zlib format is now RFC1950
-- updated Makefile.dj2
-- added algorithm.doc
-
-Changes in 1.0.1 (20 May 96) [1.0 skipped to avoid confusion]
-- fix array overlay in deflate.c which sometimes caused bad compressed data
-- fix inflate bug with empty stored block
-- fix MSDOS medium model which was broken in 0.99
-- fix deflateParams() which could generate bad compressed data.
-- Bytef is define'd instead of typedef'ed (work around Borland bug)
-- added an INDEX file
-- new makefiles for DJGPP (Makefile.dj2), 32-bit Borland (Makefile.b32),
-  Watcom (Makefile.wat), Amiga SAS/C (Makefile.sas)
-- speed up adler32 for modern machines without auto-increment
-- added -ansi for IRIX in configure
-- static_init_done in trees.c is an int
-- define unlink as delete for VMS
-- fix configure for QNX
-- add configure branch for SCO and HPUX
-- avoid many warnings (unused variables, dead assignments, etc...)
-- no fdopen for BeOS
-- fix the Watcom fix for 32 bit mode (define FAR as empty)
-- removed redefinition of Byte for MKWERKS
-- work around an MWKERKS bug (incorrect merge of all .h files)
-
-Changes in 0.99 (27 Jan 96)
-- allow preset dictionary shared between compressor and decompressor
-- allow compression level 0 (no compression)
-- add deflateParams in zlib.h: allow dynamic change of compression level
-  and compression strategy.
-- test large buffers and deflateParams in example.c
-- add optional "configure" to build zlib as a shared library
-- suppress Makefile.qnx, use configure instead
-- fixed deflate for 64-bit systems (detected on Cray)
-- fixed inflate_blocks for 64-bit systems (detected on Alpha)
-- declare Z_DEFLATED in zlib.h (possible parameter for deflateInit2)
-- always return Z_BUF_ERROR when deflate() has nothing to do
-- deflateInit and inflateInit are now macros to allow version checking
-- prefix all global functions and types with z_ with -DZ_PREFIX
-- make falloc completely reentrant (inftrees.c)
-- fixed very unlikely race condition in ct_static_init
-- free in reverse order of allocation to help memory manager
-- use zlib-1.0/* instead of zlib/* inside the tar.gz
-- make zlib warning-free with "gcc -O3 -Wall -Wwrite-strings -Wpointer-arith
-  -Wconversion -Wstrict-prototypes -Wmissing-prototypes"
-- allow gzread on concatenated .gz files
-- deflateEnd now returns Z_DATA_ERROR if it was premature
-- deflate is finally (?) fully deterministic (no matches beyond end of input)
-- Document Z_SYNC_FLUSH
-- add uninstall in Makefile
-- Check for __cpluplus in zlib.h
-- Better test in ct_align for partial flush
-- avoid harmless warnings for Borland C++
-- initialize hash_head in deflate.c
-- avoid warning on fdopen (gzio.c) for HP cc -Aa
-- include stdlib.h for STDC compilers
-- include errno.h for Cray
-- ignore error if ranlib doesn't exist
-- call ranlib twice for NeXTSTEP
-- use exec_prefix instead of prefix for libz.a
-- renamed ct_* as _tr_* to avoid conflict with applications
-- clear z->msg in inflateInit2 before any error return
-- initialize opaque in example.c, gzio.c, deflate.c and inflate.c
-- fixed typo in zconf.h (_GNUC__ => __GNUC__)
-- check for WIN32 in zconf.h and zutil.c (avoid farmalloc in 32-bit mode)
-- fix typo in Make_vms.com (f$trnlnm -> f$getsyi)
-- in fcalloc, normalize pointer if size > 65520 bytes
-- don't use special fcalloc for 32 bit Borland C++
-- use STDC instead of __GO32__ to avoid redeclaring exit, calloc, etc...
-- use Z_BINARY instead of BINARY
-- document that gzclose after gzdopen will close the file
-- allow "a" as mode in gzopen.
-- fix error checking in gzread
-- allow skipping .gz extra-field on pipes
-- added reference to Perl interface in README
-- put the crc table in FAR data (I dislike more and more the medium model :)
-- added get_crc_table
-- added a dimension to all arrays (Borland C can't count).
-- workaround Borland C bug in declaration of inflate_codes_new & inflate_fast
-- guard against multiple inclusion of *.h (for precompiled header on Mac)
-- Watcom C pretends to be Microsoft C small model even in 32 bit mode.
-- don't use unsized arrays to avoid silly warnings by Visual C++:
-     warning C4746: 'inflate_mask' : unsized array treated as  '__far'
-     (what's wrong with far data in far model?).
-- define enum out of inflate_blocks_state to allow compilation with C++
-
-Changes in 0.95 (16 Aug 95)
-- fix MSDOS small and medium model (now easier to adapt to any compiler)
-- inlined send_bits
-- fix the final (:-) bug for deflate with flush (output was correct but
-  not completely flushed in rare occasions).
-- default window size is same for compression and decompression
-  (it's now sufficient to set MAX_WBITS in zconf.h).
-- voidp -> voidpf and voidnp -> voidp (for consistency with other
-  typedefs and because voidnp was not near in large model).
-
-Changes in 0.94 (13 Aug 95)
-- support MSDOS medium model
-- fix deflate with flush (could sometimes generate bad output)
-- fix deflateReset (zlib header was incorrectly suppressed)
-- added support for VMS
-- allow a compression level in gzopen()
-- gzflush now calls fflush
-- For deflate with flush, flush even if no more input is provided.
-- rename libgz.a as libz.a
-- avoid complex expression in infcodes.c triggering Turbo C bug
-- work around a problem with gcc on Alpha (in INSERT_STRING)
-- don't use inline functions (problem with some gcc versions)
-- allow renaming of Byte, uInt, etc... with #define.
-- avoid warning about (unused) pointer before start of array in deflate.c
-- avoid various warnings in gzio.c, example.c, infblock.c, adler32.c, zutil.c
-- avoid reserved word 'new' in trees.c
-
-Changes in 0.93 (25 June 95)
-- temporarily disable inline functions
-- make deflate deterministic
-- give enough lookahead for PARTIAL_FLUSH
-- Set binary mode for stdin/stdout in minigzip.c for OS/2
-- don't even use signed char in inflate (not portable enough)
-- fix inflate memory leak for segmented architectures
-
-Changes in 0.92 (3 May 95)
-- don't assume that char is signed (problem on SGI)
-- Clear bit buffer when starting a stored block
-- no memcpy on Pyramid
-- suppressed inftest.c
-- optimized fill_window, put longest_match inline for gcc
-- optimized inflate on stored blocks.
-- untabify all sources to simplify patches
-
-Changes in 0.91 (2 May 95)
-- Default MEM_LEVEL is 8 (not 9 for Unix) as documented in zlib.h
-- Document the memory requirements in zconf.h
-- added "make install"
-- fix sync search logic in inflateSync
-- deflate(Z_FULL_FLUSH) now works even if output buffer too short
-- after inflateSync, don't scare people with just "lo world"
-- added support for DJGPP
-
-Changes in 0.9 (1 May 95)
-- don't assume that zalloc clears the allocated memory (the TurboC bug
-  was Mark's bug after all :)
-- let again gzread copy uncompressed data unchanged (was working in 0.71)
-- deflate(Z_FULL_FLUSH), inflateReset and inflateSync are now fully implemented
-- added a test of inflateSync in example.c
-- moved MAX_WBITS to zconf.h because users might want to change that.
-- document explicitly that zalloc(64K) on MSDOS must return a normalized
-  pointer (zero offset)
-- added Makefiles for Microsoft C, Turbo C, Borland C++
-- faster crc32()
-
-Changes in 0.8 (29 April 95)
-- added fast inflate (inffast.c)
-- deflate(Z_FINISH) now returns Z_STREAM_END when done. Warning: this
-  is incompatible with previous versions of zlib which returned Z_OK.
-- work around a TurboC compiler bug (bad code for b << 0, see infutil.h)
-  (actually that was not a compiler bug, see 0.81 above)
-- gzread no longer reads one extra byte in certain cases
-- In gzio destroy(), don't reference a freed structure
-- avoid many warnings for MSDOS
-- avoid the ERROR symbol which is used by MS Windows
-
-Changes in 0.71 (14 April 95)
-- Fixed more MSDOS compilation problems :( There is still a bug with
-  TurboC large model.
-
-Changes in 0.7 (14 April 95)
-- Added full inflate support.
-- Simplified the crc32() interface. The pre- and post-conditioning
-  (one's complement) is now done inside crc32(). WARNING: this is
-  incompatible with previous versions; see zlib.h for the new usage.
-
-Changes in 0.61 (12 April 95)
-- workaround for a bug in TurboC. example and minigzip now work on MSDOS.
-
-Changes in 0.6 (11 April 95)
-- added minigzip.c
-- added gzdopen to reopen a file descriptor as gzFile
-- added transparent reading of non-gziped files in gzread.
-- fixed bug in gzread (don't read crc as data)
-- fixed bug in destroy (gzio.c) (don't return Z_STREAM_END for gzclose).
-- don't allocate big arrays in the stack (for MSDOS)
-- fix some MSDOS compilation problems
-
-Changes in 0.5:
-- do real compression in deflate.c. Z_PARTIAL_FLUSH is supported but
-  not yet Z_FULL_FLUSH.
-- support decompression but only in a single step (forced Z_FINISH)
-- added opaque object for zalloc and zfree.
-- added deflateReset and inflateReset
-- added a variable zlib_version for consistency checking.
-- renamed the 'filter' parameter of deflateInit2 as 'strategy'.
-  Added Z_FILTERED and Z_HUFFMAN_ONLY constants.
-
-Changes in 0.4:
-- avoid "zip" everywhere, use zlib instead of ziplib.
-- suppress Z_BLOCK_FLUSH, interpret Z_PARTIAL_FLUSH as block flush
-  if compression method == 8.
-- added adler32 and crc32
-- renamed deflateOptions as deflateInit2, call one or the other but not both
-- added the method parameter for deflateInit2.
-- added inflateInit2
-- simplied considerably deflateInit and inflateInit by not supporting
-  user-provided history buffer. This is supported only in deflateInit2
-  and inflateInit2.
-
-Changes in 0.3:
-- prefix all macro names with Z_
-- use Z_FINISH instead of deflateEnd to finish compression.
-- added Z_HUFFMAN_ONLY
-- added gzerror()
diff --git a/src/png/zlib/FAQ b/src/png/zlib/FAQ
deleted file mode 100644
index 99b7cf92e..000000000
--- a/src/png/zlib/FAQ
+++ /dev/null
@@ -1,368 +0,0 @@
-
-                Frequently Asked Questions about zlib
-
-
-If your question is not there, please check the zlib home page
-http://zlib.net/ which may have more recent information.
-The lastest zlib FAQ is at http://zlib.net/zlib_faq.html
-
-
- 1. Is zlib Y2K-compliant?
-
-    Yes. zlib doesn't handle dates.
-
- 2. Where can I get a Windows DLL version?
-
-    The zlib sources can be compiled without change to produce a DLL.  See the
-    file win32/DLL_FAQ.txt in the zlib distribution.  Pointers to the
-    precompiled DLL are found in the zlib web site at http://zlib.net/ .
-
- 3. Where can I get a Visual Basic interface to zlib?
-
-    See
-        * http://marknelson.us/1997/01/01/zlib-engine/
-        * win32/DLL_FAQ.txt in the zlib distribution
-
- 4. compress() returns Z_BUF_ERROR.
-
-    Make sure that before the call of compress(), the length of the compressed
-    buffer is equal to the available size of the compressed buffer and not
-    zero.  For Visual Basic, check that this parameter is passed by reference
-    ("as any"), not by value ("as long").
-
- 5. deflate() or inflate() returns Z_BUF_ERROR.
-
-    Before making the call, make sure that avail_in and avail_out are not zero.
-    When setting the parameter flush equal to Z_FINISH, also make sure that
-    avail_out is big enough to allow processing all pending input.  Note that a
-    Z_BUF_ERROR is not fatal--another call to deflate() or inflate() can be
-    made with more input or output space.  A Z_BUF_ERROR may in fact be
-    unavoidable depending on how the functions are used, since it is not
-    possible to tell whether or not there is more output pending when
-    strm.avail_out returns with zero.  See http://zlib.net/zlib_how.html for a
-    heavily annotated example.
-
- 6. Where's the zlib documentation (man pages, etc.)?
-
-    It's in zlib.h .  Examples of zlib usage are in the files test/example.c
-    and test/minigzip.c, with more in examples/ .
-
- 7. Why don't you use GNU autoconf or libtool or ...?
-
-    Because we would like to keep zlib as a very small and simple package.
-    zlib is rather portable and doesn't need much configuration.
-
- 8. I found a bug in zlib.
-
-    Most of the time, such problems are due to an incorrect usage of zlib.
-    Please try to reproduce the problem with a small program and send the
-    corresponding source to us at zlib@gzip.org .  Do not send multi-megabyte
-    data files without prior agreement.
-
- 9. Why do I get "undefined reference to gzputc"?
-
-    If "make test" produces something like
-
-       example.o(.text+0x154): undefined reference to `gzputc'
-
-    check that you don't have old files libz.* in /usr/lib, /usr/local/lib or
-    /usr/X11R6/lib. Remove any old versions, then do "make install".
-
-10. I need a Delphi interface to zlib.
-
-    See the contrib/delphi directory in the zlib distribution.
-
-11. Can zlib handle .zip archives?
-
-    Not by itself, no.  See the directory contrib/minizip in the zlib
-    distribution.
-
-12. Can zlib handle .Z files?
-
-    No, sorry.  You have to spawn an uncompress or gunzip subprocess, or adapt
-    the code of uncompress on your own.
-
-13. How can I make a Unix shared library?
-
-    By default a shared (and a static) library is built for Unix.  So:
-
-    make distclean
-    ./configure
-    make
-
-14. How do I install a shared zlib library on Unix?
-
-    After the above, then:
-
-    make install
-
-    However, many flavors of Unix come with a shared zlib already installed.
-    Before going to the trouble of compiling a shared version of zlib and
-    trying to install it, you may want to check if it's already there!  If you
-    can #include <zlib.h>, it's there.  The -lz option will probably link to
-    it.  You can check the version at the top of zlib.h or with the
-    ZLIB_VERSION symbol defined in zlib.h .
-
-15. I have a question about OttoPDF.
-
-    We are not the authors of OttoPDF. The real author is on the OttoPDF web
-    site: Joel Hainley, jhainley@myndkryme.com.
-
-16. Can zlib decode Flate data in an Adobe PDF file?
-
-    Yes. See http://www.pdflib.com/ . To modify PDF forms, see
-    http://sourceforge.net/projects/acroformtool/ .
-
-17. Why am I getting this "register_frame_info not found" error on Solaris?
-
-    After installing zlib 1.1.4 on Solaris 2.6, running applications using zlib
-    generates an error such as:
-
-        ld.so.1: rpm: fatal: relocation error: file /usr/local/lib/libz.so:
-        symbol __register_frame_info: referenced symbol not found
-
-    The symbol __register_frame_info is not part of zlib, it is generated by
-    the C compiler (cc or gcc).  You must recompile applications using zlib
-    which have this problem.  This problem is specific to Solaris.  See
-    http://www.sunfreeware.com for Solaris versions of zlib and applications
-    using zlib.
-
-18. Why does gzip give an error on a file I make with compress/deflate?
-
-    The compress and deflate functions produce data in the zlib format, which
-    is different and incompatible with the gzip format.  The gz* functions in
-    zlib on the other hand use the gzip format.  Both the zlib and gzip formats
-    use the same compressed data format internally, but have different headers
-    and trailers around the compressed data.
-
-19. Ok, so why are there two different formats?
-
-    The gzip format was designed to retain the directory information about a
-    single file, such as the name and last modification date.  The zlib format
-    on the other hand was designed for in-memory and communication channel
-    applications, and has a much more compact header and trailer and uses a
-    faster integrity check than gzip.
-
-20. Well that's nice, but how do I make a gzip file in memory?
-
-    You can request that deflate write the gzip format instead of the zlib
-    format using deflateInit2().  You can also request that inflate decode the
-    gzip format using inflateInit2().  Read zlib.h for more details.
-
-21. Is zlib thread-safe?
-
-    Yes.  However any library routines that zlib uses and any application-
-    provided memory allocation routines must also be thread-safe.  zlib's gz*
-    functions use stdio library routines, and most of zlib's functions use the
-    library memory allocation routines by default.  zlib's *Init* functions
-    allow for the application to provide custom memory allocation routines.
-
-    Of course, you should only operate on any given zlib or gzip stream from a
-    single thread at a time.
-
-22. Can I use zlib in my commercial application?
-
-    Yes.  Please read the license in zlib.h.
-
-23. Is zlib under the GNU license?
-
-    No.  Please read the license in zlib.h.
-
-24. The license says that altered source versions must be "plainly marked". So
-    what exactly do I need to do to meet that requirement?
-
-    You need to change the ZLIB_VERSION and ZLIB_VERNUM #defines in zlib.h.  In
-    particular, the final version number needs to be changed to "f", and an
-    identification string should be appended to ZLIB_VERSION.  Version numbers
-    x.x.x.f are reserved for modifications to zlib by others than the zlib
-    maintainers.  For example, if the version of the base zlib you are altering
-    is "1.2.3.4", then in zlib.h you should change ZLIB_VERNUM to 0x123f, and
-    ZLIB_VERSION to something like "1.2.3.f-zachary-mods-v3".  You can also
-    update the version strings in deflate.c and inftrees.c.
-
-    For altered source distributions, you should also note the origin and
-    nature of the changes in zlib.h, as well as in ChangeLog and README, along
-    with the dates of the alterations.  The origin should include at least your
-    name (or your company's name), and an email address to contact for help or
-    issues with the library.
-
-    Note that distributing a compiled zlib library along with zlib.h and
-    zconf.h is also a source distribution, and so you should change
-    ZLIB_VERSION and ZLIB_VERNUM and note the origin and nature of the changes
-    in zlib.h as you would for a full source distribution.
-
-25. Will zlib work on a big-endian or little-endian architecture, and can I
-    exchange compressed data between them?
-
-    Yes and yes.
-
-26. Will zlib work on a 64-bit machine?
-
-    Yes.  It has been tested on 64-bit machines, and has no dependence on any
-    data types being limited to 32-bits in length.  If you have any
-    difficulties, please provide a complete problem report to zlib@gzip.org
-
-27. Will zlib decompress data from the PKWare Data Compression Library?
-
-    No.  The PKWare DCL uses a completely different compressed data format than
-    does PKZIP and zlib.  However, you can look in zlib's contrib/blast
-    directory for a possible solution to your problem.
-
-28. Can I access data randomly in a compressed stream?
-
-    No, not without some preparation.  If when compressing you periodically use
-    Z_FULL_FLUSH, carefully write all the pending data at those points, and
-    keep an index of those locations, then you can start decompression at those
-    points.  You have to be careful to not use Z_FULL_FLUSH too often, since it
-    can significantly degrade compression.  Alternatively, you can scan a
-    deflate stream once to generate an index, and then use that index for
-    random access.  See examples/zran.c .
-
-29. Does zlib work on MVS, OS/390, CICS, etc.?
-
-    It has in the past, but we have not heard of any recent evidence.  There
-    were working ports of zlib 1.1.4 to MVS, but those links no longer work.
-    If you know of recent, successful applications of zlib on these operating
-    systems, please let us know.  Thanks.
-
-30. Is there some simpler, easier to read version of inflate I can look at to
-    understand the deflate format?
-
-    First off, you should read RFC 1951.  Second, yes.  Look in zlib's
-    contrib/puff directory.
-
-31. Does zlib infringe on any patents?
-
-    As far as we know, no.  In fact, that was originally the whole point behind
-    zlib.  Look here for some more information:
-
-    http://www.gzip.org/#faq11
-
-32. Can zlib work with greater than 4 GB of data?
-
-    Yes.  inflate() and deflate() will process any amount of data correctly.
-    Each call of inflate() or deflate() is limited to input and output chunks
-    of the maximum value that can be stored in the compiler's "unsigned int"
-    type, but there is no limit to the number of chunks.  Note however that the
-    strm.total_in and strm_total_out counters may be limited to 4 GB.  These
-    counters are provided as a convenience and are not used internally by
-    inflate() or deflate().  The application can easily set up its own counters
-    updated after each call of inflate() or deflate() to count beyond 4 GB.
-    compress() and uncompress() may be limited to 4 GB, since they operate in a
-    single call.  gzseek() and gztell() may be limited to 4 GB depending on how
-    zlib is compiled.  See the zlibCompileFlags() function in zlib.h.
-
-    The word "may" appears several times above since there is a 4 GB limit only
-    if the compiler's "long" type is 32 bits.  If the compiler's "long" type is
-    64 bits, then the limit is 16 exabytes.
-
-33. Does zlib have any security vulnerabilities?
-
-    The only one that we are aware of is potentially in gzprintf().  If zlib is
-    compiled to use sprintf() or vsprintf(), then there is no protection
-    against a buffer overflow of an 8K string space (or other value as set by
-    gzbuffer()), other than the caller of gzprintf() assuring that the output
-    will not exceed 8K.  On the other hand, if zlib is compiled to use
-    snprintf() or vsnprintf(), which should normally be the case, then there is
-    no vulnerability.  The ./configure script will display warnings if an
-    insecure variation of sprintf() will be used by gzprintf().  Also the
-    zlibCompileFlags() function will return information on what variant of
-    sprintf() is used by gzprintf().
-
-    If you don't have snprintf() or vsnprintf() and would like one, you can
-    find a portable implementation here:
-
-        http://www.ijs.si/software/snprintf/
-
-    Note that you should be using the most recent version of zlib.  Versions
-    1.1.3 and before were subject to a double-free vulnerability, and versions
-    1.2.1 and 1.2.2 were subject to an access exception when decompressing
-    invalid compressed data.
-
-34. Is there a Java version of zlib?
-
-    Probably what you want is to use zlib in Java. zlib is already included
-    as part of the Java SDK in the java.util.zip package. If you really want
-    a version of zlib written in the Java language, look on the zlib home
-    page for links: http://zlib.net/ .
-
-35. I get this or that compiler or source-code scanner warning when I crank it
-    up to maximally-pedantic. Can't you guys write proper code?
-
-    Many years ago, we gave up attempting to avoid warnings on every compiler
-    in the universe.  It just got to be a waste of time, and some compilers
-    were downright silly as well as contradicted each other.  So now, we simply
-    make sure that the code always works.
-
-36. Valgrind (or some similar memory access checker) says that deflate is
-    performing a conditional jump that depends on an uninitialized value.
-    Isn't that a bug?
-
-    No.  That is intentional for performance reasons, and the output of deflate
-    is not affected.  This only started showing up recently since zlib 1.2.x
-    uses malloc() by default for allocations, whereas earlier versions used
-    calloc(), which zeros out the allocated memory.  Even though the code was
-    correct, versions 1.2.4 and later was changed to not stimulate these
-    checkers.
-
-37. Will zlib read the (insert any ancient or arcane format here) compressed
-    data format?
-
-    Probably not. Look in the comp.compression FAQ for pointers to various
-    formats and associated software.
-
-38. How can I encrypt/decrypt zip files with zlib?
-
-    zlib doesn't support encryption.  The original PKZIP encryption is very
-    weak and can be broken with freely available programs.  To get strong
-    encryption, use GnuPG, http://www.gnupg.org/ , which already includes zlib
-    compression.  For PKZIP compatible "encryption", look at
-    http://www.info-zip.org/
-
-39. What's the difference between the "gzip" and "deflate" HTTP 1.1 encodings?
-
-    "gzip" is the gzip format, and "deflate" is the zlib format.  They should
-    probably have called the second one "zlib" instead to avoid confusion with
-    the raw deflate compressed data format.  While the HTTP 1.1 RFC 2616
-    correctly points to the zlib specification in RFC 1950 for the "deflate"
-    transfer encoding, there have been reports of servers and browsers that
-    incorrectly produce or expect raw deflate data per the deflate
-    specification in RFC 1951, most notably Microsoft.  So even though the
-    "deflate" transfer encoding using the zlib format would be the more
-    efficient approach (and in fact exactly what the zlib format was designed
-    for), using the "gzip" transfer encoding is probably more reliable due to
-    an unfortunate choice of name on the part of the HTTP 1.1 authors.
-
-    Bottom line: use the gzip format for HTTP 1.1 encoding.
-
-40. Does zlib support the new "Deflate64" format introduced by PKWare?
-
-    No.  PKWare has apparently decided to keep that format proprietary, since
-    they have not documented it as they have previous compression formats.  In
-    any case, the compression improvements are so modest compared to other more
-    modern approaches, that it's not worth the effort to implement.
-
-41. I'm having a problem with the zip functions in zlib, can you help?
-
-    There are no zip functions in zlib.  You are probably using minizip by
-    Giles Vollant, which is found in the contrib directory of zlib.  It is not
-    part of zlib.  In fact none of the stuff in contrib is part of zlib.  The
-    files in there are not supported by the zlib authors.  You need to contact
-    the authors of the respective contribution for help.
-
-42. The match.asm code in contrib is under the GNU General Public License.
-    Since it's part of zlib, doesn't that mean that all of zlib falls under the
-    GNU GPL?
-
-    No.  The files in contrib are not part of zlib.  They were contributed by
-    other authors and are provided as a convenience to the user within the zlib
-    distribution.  Each item in contrib has its own license.
-
-43. Is zlib subject to export controls?  What is its ECCN?
-
-    zlib is not subject to export controls, and so is classified as EAR99.
-
-44. Can you please sign these lengthy legal documents and fax them back to us
-    so that we can use your software in our product?
-
-    No. Go away. Shoo.
diff --git a/src/png/zlib/INDEX b/src/png/zlib/INDEX
deleted file mode 100644
index 2ba064120..000000000
--- a/src/png/zlib/INDEX
+++ /dev/null
@@ -1,68 +0,0 @@
-CMakeLists.txt  cmake build file
-ChangeLog       history of changes
-FAQ             Frequently Asked Questions about zlib
-INDEX           this file
-Makefile        dummy Makefile that tells you to ./configure
-Makefile.in     template for Unix Makefile
-README          guess what
-configure       configure script for Unix
-make_vms.com    makefile for VMS
-test/example.c  zlib usages examples for build testing
-test/minigzip.c minimal gzip-like functionality for build testing
-test/infcover.c inf*.c code coverage for build coverage testing
-treebuild.xml   XML description of source file dependencies
-zconf.h.cmakein zconf.h template for cmake
-zconf.h.in      zconf.h template for configure
-zlib.3          Man page for zlib
-zlib.3.pdf      Man page in PDF format
-zlib.map        Linux symbol information
-zlib.pc.in      Template for pkg-config descriptor
-zlib.pc.cmakein zlib.pc template for cmake
-zlib2ansi       perl script to convert source files for C++ compilation
-
-amiga/          makefiles for Amiga SAS C
-as400/          makefiles for AS/400
-doc/            documentation for formats and algorithms
-msdos/          makefiles for MSDOS
-nintendods/     makefile for Nintendo DS
-old/            makefiles for various architectures and zlib documentation
-                files that have not yet been updated for zlib 1.2.x
-qnx/            makefiles for QNX
-watcom/         makefiles for OpenWatcom
-win32/          makefiles for Windows
-
-                zlib public header files (required for library use):
-zconf.h
-zlib.h
-
-                private source files used to build the zlib library:
-adler32.c
-compress.c
-crc32.c
-crc32.h
-deflate.c
-deflate.h
-gzclose.c
-gzguts.h
-gzlib.c
-gzread.c
-gzwrite.c
-infback.c
-inffast.c
-inffast.h
-inffixed.h
-inflate.c
-inflate.h
-inftrees.c
-inftrees.h
-trees.c
-trees.h
-uncompr.c
-zutil.c
-zutil.h
-
-                source files for sample programs
-See examples/README.examples
-
-                unsupported contributions by third parties
-See contrib/README.contrib
diff --git a/src/png/zlib/Makefile b/src/png/zlib/Makefile
deleted file mode 100644
index 6bba86c73..000000000
--- a/src/png/zlib/Makefile
+++ /dev/null
@@ -1,5 +0,0 @@
-all:
-	-@echo "Please use ./configure first.  Thank you."
-
-distclean:
-	make -f Makefile.in distclean
diff --git a/src/png/zlib/Makefile.in b/src/png/zlib/Makefile.in
deleted file mode 100644
index 5a77949ff..000000000
--- a/src/png/zlib/Makefile.in
+++ /dev/null
@@ -1,410 +0,0 @@
-# Makefile for zlib
-# Copyright (C) 1995-2017 Jean-loup Gailly, Mark Adler
-# For conditions of distribution and use, see copyright notice in zlib.h
-
-# To compile and test, type:
-#    ./configure; make test
-# Normally configure builds both a static and a shared library.
-# If you want to build just a static library, use: ./configure --static
-
-# To use the asm code, type:
-#    cp contrib/asm?86/match.S ./match.S
-#    make LOC=-DASMV OBJA=match.o
-
-# To install /usr/local/lib/libz.* and /usr/local/include/zlib.h, type:
-#    make install
-# To install in $HOME instead of /usr/local, use:
-#    make install prefix=$HOME
-
-CC=cc
-
-CFLAGS=-O
-#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS=-g -DZLIB_DEBUG
-#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
-#           -Wstrict-prototypes -Wmissing-prototypes
-
-SFLAGS=-O
-LDFLAGS=
-TEST_LDFLAGS=-L. libz.a
-LDSHARED=$(CC)
-CPP=$(CC) -E
-
-STATICLIB=libz.a
-SHAREDLIB=libz.so
-SHAREDLIBV=libz.so.1.2.11
-SHAREDLIBM=libz.so.1
-LIBS=$(STATICLIB) $(SHAREDLIBV)
-
-AR=ar
-ARFLAGS=rc
-RANLIB=ranlib
-LDCONFIG=ldconfig
-LDSHAREDLIBC=-lc
-TAR=tar
-SHELL=/bin/sh
-EXE=
-
-prefix = /usr/local
-exec_prefix = ${prefix}
-libdir = ${exec_prefix}/lib
-sharedlibdir = ${libdir}
-includedir = ${prefix}/include
-mandir = ${prefix}/share/man
-man3dir = ${mandir}/man3
-pkgconfigdir = ${libdir}/pkgconfig
-SRCDIR=
-ZINC=
-ZINCOUT=-I.
-
-OBJZ = adler32.o crc32.o deflate.o infback.o inffast.o inflate.o inftrees.o trees.o zutil.o
-OBJG = compress.o uncompr.o gzclose.o gzlib.o gzread.o gzwrite.o
-OBJC = $(OBJZ) $(OBJG)
-
-PIC_OBJZ = adler32.lo crc32.lo deflate.lo infback.lo inffast.lo inflate.lo inftrees.lo trees.lo zutil.lo
-PIC_OBJG = compress.lo uncompr.lo gzclose.lo gzlib.lo gzread.lo gzwrite.lo
-PIC_OBJC = $(PIC_OBJZ) $(PIC_OBJG)
-
-# to use the asm code: make OBJA=match.o, PIC_OBJA=match.lo
-OBJA =
-PIC_OBJA =
-
-OBJS = $(OBJC) $(OBJA)
-
-PIC_OBJS = $(PIC_OBJC) $(PIC_OBJA)
-
-all: static shared
-
-static: example$(EXE) minigzip$(EXE)
-
-shared: examplesh$(EXE) minigzipsh$(EXE)
-
-all64: example64$(EXE) minigzip64$(EXE)
-
-check: test
-
-test: all teststatic testshared
-
-teststatic: static
-	@TMPST=tmpst_$$; \
-	if echo hello world | ./minigzip | ./minigzip -d && ./example $$TMPST ; then \
-	  echo '		*** zlib test OK ***'; \
-	else \
-	  echo '		*** zlib test FAILED ***'; false; \
-	fi; \
-	rm -f $$TMPST
-
-testshared: shared
-	@LD_LIBRARY_PATH=`pwd`:$(LD_LIBRARY_PATH) ; export LD_LIBRARY_PATH; \
-	LD_LIBRARYN32_PATH=`pwd`:$(LD_LIBRARYN32_PATH) ; export LD_LIBRARYN32_PATH; \
-	DYLD_LIBRARY_PATH=`pwd`:$(DYLD_LIBRARY_PATH) ; export DYLD_LIBRARY_PATH; \
-	SHLIB_PATH=`pwd`:$(SHLIB_PATH) ; export SHLIB_PATH; \
-	TMPSH=tmpsh_$$; \
-	if echo hello world | ./minigzipsh | ./minigzipsh -d && ./examplesh $$TMPSH; then \
-	  echo '		*** zlib shared test OK ***'; \
-	else \
-	  echo '		*** zlib shared test FAILED ***'; false; \
-	fi; \
-	rm -f $$TMPSH
-
-test64: all64
-	@TMP64=tmp64_$$; \
-	if echo hello world | ./minigzip64 | ./minigzip64 -d && ./example64 $$TMP64; then \
-	  echo '		*** zlib 64-bit test OK ***'; \
-	else \
-	  echo '		*** zlib 64-bit test FAILED ***'; false; \
-	fi; \
-	rm -f $$TMP64
-
-infcover.o: $(SRCDIR)test/infcover.c $(SRCDIR)zlib.h zconf.h
-	$(CC) $(CFLAGS) $(ZINCOUT) -c -o $@ $(SRCDIR)test/infcover.c
-
-infcover: infcover.o libz.a
-	$(CC) $(CFLAGS) -o $@ infcover.o libz.a
-
-cover: infcover
-	rm -f *.gcda
-	./infcover
-	gcov inf*.c
-
-libz.a: $(OBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS)
-	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1
-
-match.o: match.S
-	$(CPP) match.S > _match.s
-	$(CC) -c _match.s
-	mv _match.o match.o
-	rm -f _match.s
-
-match.lo: match.S
-	$(CPP) match.S > _match.s
-	$(CC) -c -fPIC _match.s
-	mv _match.o match.lo
-	rm -f _match.s
-
-example.o: $(SRCDIR)test/example.c $(SRCDIR)zlib.h zconf.h
-	$(CC) $(CFLAGS) $(ZINCOUT) -c -o $@ $(SRCDIR)test/example.c
-
-minigzip.o: $(SRCDIR)test/minigzip.c $(SRCDIR)zlib.h zconf.h
-	$(CC) $(CFLAGS) $(ZINCOUT) -c -o $@ $(SRCDIR)test/minigzip.c
-
-example64.o: $(SRCDIR)test/example.c $(SRCDIR)zlib.h zconf.h
-	$(CC) $(CFLAGS) $(ZINCOUT) -D_FILE_OFFSET_BITS=64 -c -o $@ $(SRCDIR)test/example.c
-
-minigzip64.o: $(SRCDIR)test/minigzip.c $(SRCDIR)zlib.h zconf.h
-	$(CC) $(CFLAGS) $(ZINCOUT) -D_FILE_OFFSET_BITS=64 -c -o $@ $(SRCDIR)test/minigzip.c
-
-
-adler32.o: $(SRCDIR)adler32.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)adler32.c
-
-crc32.o: $(SRCDIR)crc32.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)crc32.c
-
-deflate.o: $(SRCDIR)deflate.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)deflate.c
-
-infback.o: $(SRCDIR)infback.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)infback.c
-
-inffast.o: $(SRCDIR)inffast.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)inffast.c
-
-inflate.o: $(SRCDIR)inflate.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)inflate.c
-
-inftrees.o: $(SRCDIR)inftrees.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)inftrees.c
-
-trees.o: $(SRCDIR)trees.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)trees.c
-
-zutil.o: $(SRCDIR)zutil.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)zutil.c
-
-compress.o: $(SRCDIR)compress.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)compress.c
-
-uncompr.o: $(SRCDIR)uncompr.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)uncompr.c
-
-gzclose.o: $(SRCDIR)gzclose.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzclose.c
-
-gzlib.o: $(SRCDIR)gzlib.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzlib.c
-
-gzread.o: $(SRCDIR)gzread.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzread.c
-
-gzwrite.o: $(SRCDIR)gzwrite.c
-	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzwrite.c
-
-
-adler32.lo: $(SRCDIR)adler32.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/adler32.o $(SRCDIR)adler32.c
-	-@mv objs/adler32.o $@
-
-crc32.lo: $(SRCDIR)crc32.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/crc32.o $(SRCDIR)crc32.c
-	-@mv objs/crc32.o $@
-
-deflate.lo: $(SRCDIR)deflate.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/deflate.o $(SRCDIR)deflate.c
-	-@mv objs/deflate.o $@
-
-infback.lo: $(SRCDIR)infback.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/infback.o $(SRCDIR)infback.c
-	-@mv objs/infback.o $@
-
-inffast.lo: $(SRCDIR)inffast.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/inffast.o $(SRCDIR)inffast.c
-	-@mv objs/inffast.o $@
-
-inflate.lo: $(SRCDIR)inflate.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/inflate.o $(SRCDIR)inflate.c
-	-@mv objs/inflate.o $@
-
-inftrees.lo: $(SRCDIR)inftrees.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/inftrees.o $(SRCDIR)inftrees.c
-	-@mv objs/inftrees.o $@
-
-trees.lo: $(SRCDIR)trees.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/trees.o $(SRCDIR)trees.c
-	-@mv objs/trees.o $@
-
-zutil.lo: $(SRCDIR)zutil.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/zutil.o $(SRCDIR)zutil.c
-	-@mv objs/zutil.o $@
-
-compress.lo: $(SRCDIR)compress.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/compress.o $(SRCDIR)compress.c
-	-@mv objs/compress.o $@
-
-uncompr.lo: $(SRCDIR)uncompr.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/uncompr.o $(SRCDIR)uncompr.c
-	-@mv objs/uncompr.o $@
-
-gzclose.lo: $(SRCDIR)gzclose.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/gzclose.o $(SRCDIR)gzclose.c
-	-@mv objs/gzclose.o $@
-
-gzlib.lo: $(SRCDIR)gzlib.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/gzlib.o $(SRCDIR)gzlib.c
-	-@mv objs/gzlib.o $@
-
-gzread.lo: $(SRCDIR)gzread.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/gzread.o $(SRCDIR)gzread.c
-	-@mv objs/gzread.o $@
-
-gzwrite.lo: $(SRCDIR)gzwrite.c
-	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/gzwrite.o $(SRCDIR)gzwrite.c
-	-@mv objs/gzwrite.o $@
-
-
-placebo $(SHAREDLIBV): $(PIC_OBJS) libz.a
-	$(LDSHARED) $(SFLAGS) -o $@ $(PIC_OBJS) $(LDSHAREDLIBC) $(LDFLAGS)
-	rm -f $(SHAREDLIB) $(SHAREDLIBM)
-	ln -s $@ $(SHAREDLIB)
-	ln -s $@ $(SHAREDLIBM)
-	-@rmdir objs
-
-example$(EXE): example.o $(STATICLIB)
-	$(CC) $(CFLAGS) -o $@ example.o $(TEST_LDFLAGS)
-
-minigzip$(EXE): minigzip.o $(STATICLIB)
-	$(CC) $(CFLAGS) -o $@ minigzip.o $(TEST_LDFLAGS)
-
-examplesh$(EXE): example.o $(SHAREDLIBV)
-	$(CC) $(CFLAGS) -o $@ example.o -L. $(SHAREDLIBV)
-
-minigzipsh$(EXE): minigzip.o $(SHAREDLIBV)
-	$(CC) $(CFLAGS) -o $@ minigzip.o -L. $(SHAREDLIBV)
-
-example64$(EXE): example64.o $(STATICLIB)
-	$(CC) $(CFLAGS) -o $@ example64.o $(TEST_LDFLAGS)
-
-minigzip64$(EXE): minigzip64.o $(STATICLIB)
-	$(CC) $(CFLAGS) -o $@ minigzip64.o $(TEST_LDFLAGS)
-
-install-libs: $(LIBS)
-	-@if [ ! -d $(DESTDIR)$(exec_prefix)  ]; then mkdir -p $(DESTDIR)$(exec_prefix); fi
-	-@if [ ! -d $(DESTDIR)$(libdir)       ]; then mkdir -p $(DESTDIR)$(libdir); fi
-	-@if [ ! -d $(DESTDIR)$(sharedlibdir) ]; then mkdir -p $(DESTDIR)$(sharedlibdir); fi
-	-@if [ ! -d $(DESTDIR)$(man3dir)      ]; then mkdir -p $(DESTDIR)$(man3dir); fi
-	-@if [ ! -d $(DESTDIR)$(pkgconfigdir) ]; then mkdir -p $(DESTDIR)$(pkgconfigdir); fi
-	rm -f $(DESTDIR)$(libdir)/$(STATICLIB)
-	cp $(STATICLIB) $(DESTDIR)$(libdir)
-	chmod 644 $(DESTDIR)$(libdir)/$(STATICLIB)
-	-@($(RANLIB) $(DESTDIR)$(libdir)/libz.a || true) >/dev/null 2>&1
-	-@if test -n "$(SHAREDLIBV)"; then \
-	  rm -f $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV); \
-	  cp $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir); \
-	  echo "cp $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)"; \
-	  chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV); \
-	  echo "chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV)"; \
-	  rm -f $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \
-	  ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIB); \
-	  ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \
-	  ($(LDCONFIG) || true)  >/dev/null 2>&1; \
-	fi
-	rm -f $(DESTDIR)$(man3dir)/zlib.3
-	cp $(SRCDIR)zlib.3 $(DESTDIR)$(man3dir)
-	chmod 644 $(DESTDIR)$(man3dir)/zlib.3
-	rm -f $(DESTDIR)$(pkgconfigdir)/zlib.pc
-	cp zlib.pc $(DESTDIR)$(pkgconfigdir)
-	chmod 644 $(DESTDIR)$(pkgconfigdir)/zlib.pc
-# The ranlib in install is needed on NeXTSTEP which checks file times
-# ldconfig is for Linux
-
-install: install-libs
-	-@if [ ! -d $(DESTDIR)$(includedir)   ]; then mkdir -p $(DESTDIR)$(includedir); fi
-	rm -f $(DESTDIR)$(includedir)/zlib.h $(DESTDIR)$(includedir)/zconf.h
-	cp $(SRCDIR)zlib.h zconf.h $(DESTDIR)$(includedir)
-	chmod 644 $(DESTDIR)$(includedir)/zlib.h $(DESTDIR)$(includedir)/zconf.h
-
-uninstall:
-	cd $(DESTDIR)$(includedir) && rm -f zlib.h zconf.h
-	cd $(DESTDIR)$(libdir) && rm -f libz.a; \
-	if test -n "$(SHAREDLIBV)" -a -f $(SHAREDLIBV); then \
-	  rm -f $(SHAREDLIBV) $(SHAREDLIB) $(SHAREDLIBM); \
-	fi
-	cd $(DESTDIR)$(man3dir) && rm -f zlib.3
-	cd $(DESTDIR)$(pkgconfigdir) && rm -f zlib.pc
-
-docs: zlib.3.pdf
-
-zlib.3.pdf: $(SRCDIR)zlib.3
-	groff -mandoc -f H -T ps $(SRCDIR)zlib.3 | ps2pdf - $@
-
-zconf.h.cmakein: $(SRCDIR)zconf.h.in
-	-@ TEMPFILE=zconfh_$$; \
-	echo "/#define ZCONF_H/ a\\\\\n#cmakedefine Z_PREFIX\\\\\n#cmakedefine Z_HAVE_UNISTD_H\n" >> $$TEMPFILE &&\
-	sed -f $$TEMPFILE $(SRCDIR)zconf.h.in > $@ &&\
-	touch -r $(SRCDIR)zconf.h.in $@ &&\
-	rm $$TEMPFILE
-
-zconf: $(SRCDIR)zconf.h.in
-	cp -p $(SRCDIR)zconf.h.in zconf.h
-
-mostlyclean: clean
-clean:
-	rm -f *.o *.lo *~ \
-	   example$(EXE) minigzip$(EXE) examplesh$(EXE) minigzipsh$(EXE) \
-	   example64$(EXE) minigzip64$(EXE) \
-	   infcover \
-	   libz.* foo.gz so_locations \
-	   _match.s maketree contrib/infback9/*.o
-	rm -rf objs
-	rm -f *.gcda *.gcno *.gcov
-	rm -f contrib/infback9/*.gcda contrib/infback9/*.gcno contrib/infback9/*.gcov
-
-maintainer-clean: distclean
-distclean: clean zconf zconf.h.cmakein docs
-	rm -f Makefile zlib.pc configure.log
-	-@rm -f .DS_Store
-	@if [ -f Makefile.in ]; then \
-	printf 'all:\n\t-@echo "Please use ./configure first.  Thank you."\n' > Makefile ; \
-	printf '\ndistclean:\n\tmake -f Makefile.in distclean\n' >> Makefile ; \
-	touch -r $(SRCDIR)Makefile.in Makefile ; fi
-	@if [ ! -f zconf.h.in ]; then rm -f zconf.h zconf.h.cmakein ; fi
-	@if [ ! -f zlib.3 ]; then rm -f zlib.3.pdf ; fi
-
-tags:
-	etags $(SRCDIR)*.[ch]
-
-adler32.o zutil.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
-gzclose.o gzlib.o gzread.o gzwrite.o: $(SRCDIR)zlib.h zconf.h $(SRCDIR)gzguts.h
-compress.o example.o minigzip.o uncompr.o: $(SRCDIR)zlib.h zconf.h
-crc32.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)crc32.h
-deflate.o: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
-infback.o inflate.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h $(SRCDIR)inffixed.h
-inffast.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h
-inftrees.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h
-trees.o: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)trees.h
-
-adler32.lo zutil.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
-gzclose.lo gzlib.lo gzread.lo gzwrite.lo: $(SRCDIR)zlib.h zconf.h $(SRCDIR)gzguts.h
-compress.lo example.lo minigzip.lo uncompr.lo: $(SRCDIR)zlib.h zconf.h
-crc32.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)crc32.h
-deflate.lo: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
-infback.lo inflate.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h $(SRCDIR)inffixed.h
-inffast.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h
-inftrees.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h
-trees.lo: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)trees.h
diff --git a/src/png/zlib/README b/src/png/zlib/README
deleted file mode 100644
index 51106de47..000000000
--- a/src/png/zlib/README
+++ /dev/null
@@ -1,115 +0,0 @@
-ZLIB DATA COMPRESSION LIBRARY
-
-zlib 1.2.11 is a general purpose data compression library.  All the code is
-thread safe.  The data format used by the zlib library is described by RFCs
-(Request for Comments) 1950 to 1952 in the files
-http://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and
-rfc1952 (gzip format).
-
-All functions of the compression library are documented in the file zlib.h
-(volunteer to write man pages welcome, contact zlib@gzip.org).  A usage example
-of the library is given in the file test/example.c which also tests that
-the library is working correctly.  Another example is given in the file
-test/minigzip.c.  The compression library itself is composed of all source
-files in the root directory.
-
-To compile all files and run the test program, follow the instructions given at
-the top of Makefile.in.  In short "./configure; make test", and if that goes
-well, "make install" should work for most flavors of Unix.  For Windows, use
-one of the special makefiles in win32/ or contrib/vstudio/ .  For VMS, use
-make_vms.com.
-
-Questions about zlib should be sent to <zlib@gzip.org>, or to Gilles Vollant
-<info@winimage.com> for the Windows DLL version.  The zlib home page is
-http://zlib.net/ .  Before reporting a problem, please check this site to
-verify that you have the latest version of zlib; otherwise get the latest
-version and check whether the problem still exists or not.
-
-PLEASE read the zlib FAQ http://zlib.net/zlib_faq.html before asking for help.
-
-Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan.  1997
-issue of Dr.  Dobb's Journal; a copy of the article is available at
-http://marknelson.us/1997/01/01/zlib-engine/ .
-
-The changes made in version 1.2.11 are documented in the file ChangeLog.
-
-Unsupported third party contributions are provided in directory contrib/ .
-
-zlib is available in Java using the java.util.zip package, documented at
-http://java.sun.com/developer/technicalArticles/Programming/compression/ .
-
-A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is available
-at CPAN (Comprehensive Perl Archive Network) sites, including
-http://search.cpan.org/~pmqs/IO-Compress-Zlib/ .
-
-A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is
-available in Python 1.5 and later versions, see
-http://docs.python.org/library/zlib.html .
-
-zlib is built into tcl: http://wiki.tcl.tk/4610 .
-
-An experimental package to read and write files in .zip format, written on top
-of zlib by Gilles Vollant <info@winimage.com>, is available in the
-contrib/minizip directory of zlib.
-
-
-Notes for some targets:
-
-- For Windows DLL versions, please see win32/DLL_FAQ.txt
-
-- For 64-bit Irix, deflate.c must be compiled without any optimization. With
-  -O, one libpng test fails. The test works in 32 bit mode (with the -n32
-  compiler flag). The compiler bug has been reported to SGI.
-
-- zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works
-  when compiled with cc.
-
-- On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is
-  necessary to get gzprintf working correctly. This is done by configure.
-
-- zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with
-  other compilers. Use "make test" to check your compiler.
-
-- gzdopen is not supported on RISCOS or BEOS.
-
-- For PalmOs, see http://palmzlib.sourceforge.net/
-
-
-Acknowledgments:
-
-  The deflate format used by zlib was defined by Phil Katz.  The deflate and
-  zlib specifications were written by L.  Peter Deutsch.  Thanks to all the
-  people who reported problems and suggested various improvements in zlib; they
-  are too numerous to cite here.
-
-Copyright notice:
-
- (C) 1995-2017 Jean-loup Gailly and Mark Adler
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the authors be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-
-  Jean-loup Gailly        Mark Adler
-  jloup@gzip.org          madler@alumni.caltech.edu
-
-If you use the zlib library in a product, we would appreciate *not* receiving
-lengthy legal documents to sign.  The sources are provided for free but without
-warranty of any kind.  The library has been entirely written by Jean-loup
-Gailly and Mark Adler; it does not include third-party code.
-
-If you redistribute modified sources, we would appreciate that you include in
-the file ChangeLog history information documenting your changes.  Please read
-the FAQ for more information on the distribution of modified source versions.
diff --git a/src/png/zlib/adler32.c b/src/png/zlib/adler32.c
deleted file mode 100644
index d0be4380a..000000000
--- a/src/png/zlib/adler32.c
+++ /dev/null
@@ -1,186 +0,0 @@
-/* adler32.c -- compute the Adler-32 checksum of a data stream
- * Copyright (C) 1995-2011, 2016 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* @(#) $Id$ */
-
-#include "zutil.h"
-
-local uLong adler32_combine_ OF((uLong adler1, uLong adler2, z_off64_t len2));
-
-#define BASE 65521U     /* largest prime smaller than 65536 */
-#define NMAX 5552
-/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
-
-#define DO1(buf,i)  {adler += (buf)[i]; sum2 += adler;}
-#define DO2(buf,i)  DO1(buf,i); DO1(buf,i+1);
-#define DO4(buf,i)  DO2(buf,i); DO2(buf,i+2);
-#define DO8(buf,i)  DO4(buf,i); DO4(buf,i+4);
-#define DO16(buf)   DO8(buf,0); DO8(buf,8);
-
-/* use NO_DIVIDE if your processor does not do division in hardware --
-   try it both ways to see which is faster */
-#ifdef NO_DIVIDE
-/* note that this assumes BASE is 65521, where 65536 % 65521 == 15
-   (thank you to John Reiser for pointing this out) */
-#  define CHOP(a) \
-    do { \
-        unsigned long tmp = a >> 16; \
-        a &= 0xffffUL; \
-        a += (tmp << 4) - tmp; \
-    } while (0)
-#  define MOD28(a) \
-    do { \
-        CHOP(a); \
-        if (a >= BASE) a -= BASE; \
-    } while (0)
-#  define MOD(a) \
-    do { \
-        CHOP(a); \
-        MOD28(a); \
-    } while (0)
-#  define MOD63(a) \
-    do { /* this assumes a is not negative */ \
-        z_off64_t tmp = a >> 32; \
-        a &= 0xffffffffL; \
-        a += (tmp << 8) - (tmp << 5) + tmp; \
-        tmp = a >> 16; \
-        a &= 0xffffL; \
-        a += (tmp << 4) - tmp; \
-        tmp = a >> 16; \
-        a &= 0xffffL; \
-        a += (tmp << 4) - tmp; \
-        if (a >= BASE) a -= BASE; \
-    } while (0)
-#else
-#  define MOD(a) a %= BASE
-#  define MOD28(a) a %= BASE
-#  define MOD63(a) a %= BASE
-#endif
-
-/* ========================================================================= */
-uLong ZEXPORT adler32_z(adler, buf, len)
-    uLong adler;
-    const Bytef *buf;
-    z_size_t len;
-{
-    unsigned long sum2;
-    unsigned n;
-
-    /* split Adler-32 into component sums */
-    sum2 = (adler >> 16) & 0xffff;
-    adler &= 0xffff;
-
-    /* in case user likes doing a byte at a time, keep it fast */
-    if (len == 1) {
-        adler += buf[0];
-        if (adler >= BASE)
-            adler -= BASE;
-        sum2 += adler;
-        if (sum2 >= BASE)
-            sum2 -= BASE;
-        return adler | (sum2 << 16);
-    }
-
-    /* initial Adler-32 value (deferred check for len == 1 speed) */
-    if (buf == Z_NULL)
-        return 1L;
-
-    /* in case short lengths are provided, keep it somewhat fast */
-    if (len < 16) {
-        while (len--) {
-            adler += *buf++;
-            sum2 += adler;
-        }
-        if (adler >= BASE)
-            adler -= BASE;
-        MOD28(sum2);            /* only added so many BASE's */
-        return adler | (sum2 << 16);
-    }
-
-    /* do length NMAX blocks -- requires just one modulo operation */
-    while (len >= NMAX) {
-        len -= NMAX;
-        n = NMAX / 16;          /* NMAX is divisible by 16 */
-        do {
-            DO16(buf);          /* 16 sums unrolled */
-            buf += 16;
-        } while (--n);
-        MOD(adler);
-        MOD(sum2);
-    }
-
-    /* do remaining bytes (less than NMAX, still just one modulo) */
-    if (len) {                  /* avoid modulos if none remaining */
-        while (len >= 16) {
-            len -= 16;
-            DO16(buf);
-            buf += 16;
-        }
-        while (len--) {
-            adler += *buf++;
-            sum2 += adler;
-        }
-        MOD(adler);
-        MOD(sum2);
-    }
-
-    /* return recombined sums */
-    return adler | (sum2 << 16);
-}
-
-/* ========================================================================= */
-uLong ZEXPORT adler32(adler, buf, len)
-    uLong adler;
-    const Bytef *buf;
-    uInt len;
-{
-    return adler32_z(adler, buf, len);
-}
-
-/* ========================================================================= */
-local uLong adler32_combine_(adler1, adler2, len2)
-    uLong adler1;
-    uLong adler2;
-    z_off64_t len2;
-{
-    unsigned long sum1;
-    unsigned long sum2;
-    unsigned rem;
-
-    /* for negative len, return invalid adler32 as a clue for debugging */
-    if (len2 < 0)
-        return 0xffffffffUL;
-
-    /* the derivation of this formula is left as an exercise for the reader */
-    MOD63(len2);                /* assumes len2 >= 0 */
-    rem = (unsigned)len2;
-    sum1 = adler1 & 0xffff;
-    sum2 = rem * sum1;
-    MOD(sum2);
-    sum1 += (adler2 & 0xffff) + BASE - 1;
-    sum2 += ((adler1 >> 16) & 0xffff) + ((adler2 >> 16) & 0xffff) + BASE - rem;
-    if (sum1 >= BASE) sum1 -= BASE;
-    if (sum1 >= BASE) sum1 -= BASE;
-    if (sum2 >= ((unsigned long)BASE << 1)) sum2 -= ((unsigned long)BASE << 1);
-    if (sum2 >= BASE) sum2 -= BASE;
-    return sum1 | (sum2 << 16);
-}
-
-/* ========================================================================= */
-uLong ZEXPORT adler32_combine(adler1, adler2, len2)
-    uLong adler1;
-    uLong adler2;
-    z_off_t len2;
-{
-    return adler32_combine_(adler1, adler2, len2);
-}
-
-uLong ZEXPORT adler32_combine64(adler1, adler2, len2)
-    uLong adler1;
-    uLong adler2;
-    z_off64_t len2;
-{
-    return adler32_combine_(adler1, adler2, len2);
-}
diff --git a/src/png/zlib/amiga/Makefile.pup b/src/png/zlib/amiga/Makefile.pup
deleted file mode 100644
index 8940c120f..000000000
--- a/src/png/zlib/amiga/Makefile.pup
+++ /dev/null
@@ -1,69 +0,0 @@
-# Amiga powerUP (TM) Makefile
-# makefile for libpng and SAS C V6.58/7.00 PPC compiler
-# Copyright (C) 1998 by Andreas R. Kleinert
-
-LIBNAME	= libzip.a
-
-CC	= scppc
-CFLAGS	= NOSTKCHK NOSINT OPTIMIZE OPTGO OPTPEEP OPTINLOCAL OPTINL \
-	  OPTLOOP OPTRDEP=8 OPTDEP=8 OPTCOMP=8 NOVER
-AR	= ppc-amigaos-ar cr
-RANLIB	= ppc-amigaos-ranlib
-LD	= ppc-amigaos-ld -r
-LDFLAGS	= -o
-LDLIBS	= LIB:scppc.a LIB:end.o
-RM	= delete quiet
-
-OBJS = adler32.o compress.o crc32.o gzclose.o gzlib.o gzread.o gzwrite.o \
-       uncompr.o deflate.o trees.o zutil.o inflate.o infback.o inftrees.o inffast.o
-
-TEST_OBJS = example.o minigzip.o
-
-all: example minigzip
-
-check: test
-test: all
-	example
-	echo hello world | minigzip | minigzip -d
-
-$(LIBNAME): $(OBJS)
-	$(AR) $@ $(OBJS)
-	-$(RANLIB) $@
-
-example: example.o $(LIBNAME)
-	$(LD) $(LDFLAGS) $@ LIB:c_ppc.o $@.o $(LIBNAME) $(LDLIBS)
-
-minigzip: minigzip.o $(LIBNAME)
-	$(LD) $(LDFLAGS) $@ LIB:c_ppc.o $@.o $(LIBNAME) $(LDLIBS)
-
-mostlyclean: clean
-clean:
-	$(RM) *.o example minigzip $(LIBNAME) foo.gz
-
-zip:
-	zip -ul9 zlib README ChangeLog Makefile Make????.??? Makefile.?? \
-	  descrip.mms *.[ch]
-
-tgz:
-	cd ..; tar cfz zlib/zlib.tgz zlib/README zlib/ChangeLog zlib/Makefile \
-	  zlib/Make????.??? zlib/Makefile.?? zlib/descrip.mms zlib/*.[ch]
-
-# DO NOT DELETE THIS LINE -- make depend depends on it.
-
-adler32.o: zlib.h zconf.h
-compress.o: zlib.h zconf.h
-crc32.o: crc32.h zlib.h zconf.h
-deflate.o: deflate.h zutil.h zlib.h zconf.h
-example.o: zlib.h zconf.h
-gzclose.o: zlib.h zconf.h gzguts.h
-gzlib.o: zlib.h zconf.h gzguts.h
-gzread.o: zlib.h zconf.h gzguts.h
-gzwrite.o: zlib.h zconf.h gzguts.h
-inffast.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
-inflate.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
-infback.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
-inftrees.o: zutil.h zlib.h zconf.h inftrees.h
-minigzip.o: zlib.h zconf.h
-trees.o: deflate.h zutil.h zlib.h zconf.h trees.h
-uncompr.o: zlib.h zconf.h
-zutil.o: zutil.h zlib.h zconf.h
diff --git a/src/png/zlib/amiga/Makefile.sas b/src/png/zlib/amiga/Makefile.sas
deleted file mode 100644
index 749e29152..000000000
--- a/src/png/zlib/amiga/Makefile.sas
+++ /dev/null
@@ -1,68 +0,0 @@
-# SMakefile for zlib
-# Modified from the standard UNIX Makefile Copyright Jean-loup Gailly
-# Osma Ahvenlampi <Osma.Ahvenlampi@hut.fi>
-# Amiga, SAS/C 6.56 & Smake
-
-CC=sc
-CFLAGS=OPT
-#CFLAGS=OPT CPU=68030
-#CFLAGS=DEBUG=LINE
-LDFLAGS=LIB z.lib
-
-SCOPTIONS=OPTSCHED OPTINLINE OPTALIAS OPTTIME OPTINLOCAL STRMERGE \
-       NOICONS PARMS=BOTH NOSTACKCHECK UTILLIB NOVERSION ERRORREXX \
-       DEF=POSTINC
-
-OBJS = adler32.o compress.o crc32.o gzclose.o gzlib.o gzread.o gzwrite.o \
-       uncompr.o deflate.o trees.o zutil.o inflate.o infback.o inftrees.o inffast.o
-
-TEST_OBJS = example.o minigzip.o
-
-all: SCOPTIONS example minigzip
-
-check: test
-test: all
-	example
-	echo hello world | minigzip | minigzip -d
-
-install: z.lib
-	copy clone zlib.h zconf.h INCLUDE:
-	copy clone z.lib LIB:
-
-z.lib: $(OBJS)
-	oml z.lib r $(OBJS)
-
-example: example.o z.lib
-	$(CC) $(CFLAGS) LINK TO $@ example.o $(LDFLAGS)
-
-minigzip: minigzip.o z.lib
-	$(CC) $(CFLAGS) LINK TO $@ minigzip.o $(LDFLAGS)
-
-mostlyclean: clean
-clean:
-	-delete force quiet example minigzip *.o z.lib foo.gz *.lnk SCOPTIONS
-
-SCOPTIONS: Makefile.sas
-	copy to $@ <from <
-$(SCOPTIONS)
-<
-
-# DO NOT DELETE THIS LINE -- make depend depends on it.
-
-adler32.o: zlib.h zconf.h
-compress.o: zlib.h zconf.h
-crc32.o: crc32.h zlib.h zconf.h
-deflate.o: deflate.h zutil.h zlib.h zconf.h
-example.o: zlib.h zconf.h
-gzclose.o: zlib.h zconf.h gzguts.h
-gzlib.o: zlib.h zconf.h gzguts.h
-gzread.o: zlib.h zconf.h gzguts.h
-gzwrite.o: zlib.h zconf.h gzguts.h
-inffast.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
-inflate.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
-infback.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
-inftrees.o: zutil.h zlib.h zconf.h inftrees.h
-minigzip.o: zlib.h zconf.h
-trees.o: deflate.h zutil.h zlib.h zconf.h trees.h
-uncompr.o: zlib.h zconf.h
-zutil.o: zutil.h zlib.h zconf.h
diff --git a/src/png/zlib/compress.c b/src/png/zlib/compress.c
deleted file mode 100644
index e2db404ab..000000000
--- a/src/png/zlib/compress.c
+++ /dev/null
@@ -1,86 +0,0 @@
-/* compress.c -- compress a memory buffer
- * Copyright (C) 1995-2005, 2014, 2016 Jean-loup Gailly, Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* @(#) $Id$ */
-
-#define ZLIB_INTERNAL
-#include "zlib.h"
-
-/* ===========================================================================
-     Compresses the source buffer into the destination buffer. The level
-   parameter has the same meaning as in deflateInit.  sourceLen is the byte
-   length of the source buffer. Upon entry, destLen is the total size of the
-   destination buffer, which must be at least 0.1% larger than sourceLen plus
-   12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
-
-     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
-   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
-   Z_STREAM_ERROR if the level parameter is invalid.
-*/
-int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
-    Bytef *dest;
-    uLongf *destLen;
-    const Bytef *source;
-    uLong sourceLen;
-    int level;
-{
-    z_stream stream;
-    int err;
-    const uInt max = (uInt)-1;
-    uLong left;
-
-    left = *destLen;
-    *destLen = 0;
-
-    stream.zalloc = (alloc_func)0;
-    stream.zfree = (free_func)0;
-    stream.opaque = (voidpf)0;
-
-    err = deflateInit(&stream, level);
-    if (err != Z_OK) return err;
-
-    stream.next_out = dest;
-    stream.avail_out = 0;
-    stream.next_in = (z_const Bytef *)source;
-    stream.avail_in = 0;
-
-    do {
-        if (stream.avail_out == 0) {
-            stream.avail_out = left > (uLong)max ? max : (uInt)left;
-            left -= stream.avail_out;
-        }
-        if (stream.avail_in == 0) {
-            stream.avail_in = sourceLen > (uLong)max ? max : (uInt)sourceLen;
-            sourceLen -= stream.avail_in;
-        }
-        err = deflate(&stream, sourceLen ? Z_NO_FLUSH : Z_FINISH);
-    } while (err == Z_OK);
-
-    *destLen = stream.total_out;
-    deflateEnd(&stream);
-    return err == Z_STREAM_END ? Z_OK : err;
-}
-
-/* ===========================================================================
- */
-int ZEXPORT compress (dest, destLen, source, sourceLen)
-    Bytef *dest;
-    uLongf *destLen;
-    const Bytef *source;
-    uLong sourceLen;
-{
-    return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
-}
-
-/* ===========================================================================
-     If the default memLevel or windowBits for deflateInit() is changed, then
-   this function needs to be updated.
- */
-uLong ZEXPORT compressBound (sourceLen)
-    uLong sourceLen;
-{
-    return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
-           (sourceLen >> 25) + 13;
-}
diff --git a/src/png/zlib/configure b/src/png/zlib/configure
deleted file mode 100644
index e974d1fd7..000000000
--- a/src/png/zlib/configure
+++ /dev/null
@@ -1,921 +0,0 @@
-#!/bin/sh
-# configure script for zlib.
-#
-# Normally configure builds both a static and a shared library.
-# If you want to build just a static library, use: ./configure --static
-#
-# To impose specific compiler or flags or install directory, use for example:
-#    prefix=$HOME CC=cc CFLAGS="-O4" ./configure
-# or for csh/tcsh users:
-#    (setenv prefix $HOME; setenv CC cc; setenv CFLAGS "-O4"; ./configure)
-
-# Incorrect settings of CC or CFLAGS may prevent creating a shared library.
-# If you have problems, try without defining CC and CFLAGS before reporting
-# an error.
-
-# start off configure.log
-echo -------------------- >> configure.log
-echo $0 $* >> configure.log
-date >> configure.log
-
-# get source directory
-SRCDIR=`dirname $0`
-if test $SRCDIR = "."; then
-    ZINC=""
-    ZINCOUT="-I."
-    SRCDIR=""
-else
-    ZINC='-include zconf.h'
-    ZINCOUT='-I. -I$(SRCDIR)'
-    SRCDIR="$SRCDIR/"
-fi
-
-# set command prefix for cross-compilation
-if [ -n "${CHOST}" ]; then
-    uname="`echo "${CHOST}" | sed -e 's/^[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)-.*$/\1/'`"
-    CROSS_PREFIX="${CHOST}-"
-fi
-
-# destination name for static library
-STATICLIB=libz.a
-
-# extract zlib version numbers from zlib.h
-VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < ${SRCDIR}zlib.h`
-VER3=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\\.[0-9]*\).*/\1/p' < ${SRCDIR}zlib.h`
-VER2=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\)\\..*/\1/p' < ${SRCDIR}zlib.h`
-VER1=`sed -n -e '/VERSION "/s/.*"\([0-9]*\)\\..*/\1/p' < ${SRCDIR}zlib.h`
-
-# establish commands for library building
-if "${CROSS_PREFIX}ar" --version >/dev/null 2>/dev/null || test $? -lt 126; then
-    AR=${AR-"${CROSS_PREFIX}ar"}
-    test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log
-else
-    AR=${AR-"ar"}
-    test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log
-fi
-ARFLAGS=${ARFLAGS-"rc"}
-if "${CROSS_PREFIX}ranlib" --version >/dev/null 2>/dev/null || test $? -lt 126; then
-    RANLIB=${RANLIB-"${CROSS_PREFIX}ranlib"}
-    test -n "${CROSS_PREFIX}" && echo Using ${RANLIB} | tee -a configure.log
-else
-    RANLIB=${RANLIB-"ranlib"}
-fi
-if "${CROSS_PREFIX}nm" --version >/dev/null 2>/dev/null || test $? -lt 126; then
-    NM=${NM-"${CROSS_PREFIX}nm"}
-    test -n "${CROSS_PREFIX}" && echo Using ${NM} | tee -a configure.log
-else
-    NM=${NM-"nm"}
-fi
-
-# set defaults before processing command line options
-LDCONFIG=${LDCONFIG-"ldconfig"}
-LDSHAREDLIBC="${LDSHAREDLIBC--lc}"
-ARCHS=
-prefix=${prefix-/usr/local}
-exec_prefix=${exec_prefix-'${prefix}'}
-libdir=${libdir-'${exec_prefix}/lib'}
-sharedlibdir=${sharedlibdir-'${libdir}'}
-includedir=${includedir-'${prefix}/include'}
-mandir=${mandir-'${prefix}/share/man'}
-shared_ext='.so'
-shared=1
-solo=0
-cover=0
-zprefix=0
-zconst=0
-build64=0
-gcc=0
-warn=0
-debug=0
-old_cc="$CC"
-old_cflags="$CFLAGS"
-OBJC='$(OBJZ) $(OBJG)'
-PIC_OBJC='$(PIC_OBJZ) $(PIC_OBJG)'
-
-# leave this script, optionally in a bad way
-leave()
-{
-  if test "$*" != "0"; then
-    echo "** $0 aborting." | tee -a configure.log
-  fi
-  rm -f $test.[co] $test $test$shared_ext $test.gcno ./--version
-  echo -------------------- >> configure.log
-  echo >> configure.log
-  echo >> configure.log
-  exit $1
-}
-
-# process command line options
-while test $# -ge 1
-do
-case "$1" in
-    -h* | --help)
-      echo 'usage:' | tee -a configure.log
-      echo '  configure [--const] [--zprefix] [--prefix=PREFIX]  [--eprefix=EXPREFIX]' | tee -a configure.log
-      echo '    [--static] [--64] [--libdir=LIBDIR] [--sharedlibdir=LIBDIR]' | tee -a configure.log
-      echo '    [--includedir=INCLUDEDIR] [--archs="-arch i386 -arch x86_64"]' | tee -a configure.log
-        exit 0 ;;
-    -p*=* | --prefix=*) prefix=`echo $1 | sed 's/.*=//'`; shift ;;
-    -e*=* | --eprefix=*) exec_prefix=`echo $1 | sed 's/.*=//'`; shift ;;
-    -l*=* | --libdir=*) libdir=`echo $1 | sed 's/.*=//'`; shift ;;
-    --sharedlibdir=*) sharedlibdir=`echo $1 | sed 's/.*=//'`; shift ;;
-    -i*=* | --includedir=*) includedir=`echo $1 | sed 's/.*=//'`;shift ;;
-    -u*=* | --uname=*) uname=`echo $1 | sed 's/.*=//'`;shift ;;
-    -p* | --prefix) prefix="$2"; shift; shift ;;
-    -e* | --eprefix) exec_prefix="$2"; shift; shift ;;
-    -l* | --libdir) libdir="$2"; shift; shift ;;
-    -i* | --includedir) includedir="$2"; shift; shift ;;
-    -s* | --shared | --enable-shared) shared=1; shift ;;
-    -t | --static) shared=0; shift ;;
-    --solo) solo=1; shift ;;
-    --cover) cover=1; shift ;;
-    -z* | --zprefix) zprefix=1; shift ;;
-    -6* | --64) build64=1; shift ;;
-    -a*=* | --archs=*) ARCHS=`echo $1 | sed 's/.*=//'`; shift ;;
-    --sysconfdir=*) echo "ignored option: --sysconfdir" | tee -a configure.log; shift ;;
-    --localstatedir=*) echo "ignored option: --localstatedir" | tee -a configure.log; shift ;;
-    -c* | --const) zconst=1; shift ;;
-    -w* | --warn) warn=1; shift ;;
-    -d* | --debug) debug=1; shift ;;
-    *)
-      echo "unknown option: $1" | tee -a configure.log
-      echo "$0 --help for help" | tee -a configure.log
-      leave 1;;
-    esac
-done
-
-# temporary file name
-test=ztest$$
-
-# put arguments in log, also put test file in log if used in arguments
-show()
-{
-  case "$*" in
-    *$test.c*)
-      echo === $test.c === >> configure.log
-      cat $test.c >> configure.log
-      echo === >> configure.log;;
-  esac
-  echo $* >> configure.log
-}
-
-# check for gcc vs. cc and set compile and link flags based on the system identified by uname
-cat > $test.c <<EOF
-extern int getchar();
-int hello() {return getchar();}
-EOF
-
-test -z "$CC" && echo Checking for ${CROSS_PREFIX}gcc... | tee -a configure.log
-cc=${CC-${CROSS_PREFIX}gcc}
-cflags=${CFLAGS-"-O3"}
-# to force the asm version use: CFLAGS="-O3 -DASMV" ./configure
-case "$cc" in
-  *gcc*) gcc=1 ;;
-  *clang*) gcc=1 ;;
-esac
-case `$cc -v 2>&1` in
-  *gcc*) gcc=1 ;;
-  *clang*) gcc=1 ;;
-esac
-
-show $cc -c $test.c
-if test "$gcc" -eq 1 && ($cc -c $test.c) >> configure.log 2>&1; then
-  echo ... using gcc >> configure.log
-  CC="$cc"
-  CFLAGS="${CFLAGS--O3}"
-  SFLAGS="${CFLAGS--O3} -fPIC"
-  if test "$ARCHS"; then
-    CFLAGS="${CFLAGS} ${ARCHS}"
-    LDFLAGS="${LDFLAGS} ${ARCHS}"
-  fi
-  if test $build64 -eq 1; then
-    CFLAGS="${CFLAGS} -m64"
-    SFLAGS="${SFLAGS} -m64"
-  fi
-  if test "$warn" -eq 1; then
-    if test "$zconst" -eq 1; then
-      CFLAGS="${CFLAGS} -Wall -Wextra -Wcast-qual -pedantic -DZLIB_CONST"
-    else
-      CFLAGS="${CFLAGS} -Wall -Wextra -pedantic"
-    fi
-  fi
-  if test $debug -eq 1; then
-    CFLAGS="${CFLAGS} -DZLIB_DEBUG"
-    SFLAGS="${SFLAGS} -DZLIB_DEBUG"
-  fi
-  if test -z "$uname"; then
-    uname=`(uname -s || echo unknown) 2>/dev/null`
-  fi
-  case "$uname" in
-  Linux* | linux* | GNU | GNU/* | solaris*)
-        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}zlib.map"} ;;
-  *BSD | *bsd* | DragonFly)
-        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}zlib.map"}
-        LDCONFIG="ldconfig -m" ;;
-  CYGWIN* | Cygwin* | cygwin* | OS/2*)
-        EXE='.exe' ;;
-  MINGW* | mingw*)
-# temporary bypass
-        rm -f $test.[co] $test $test$shared_ext
-        echo "Please use win32/Makefile.gcc instead." | tee -a configure.log
-        leave 1
-        LDSHARED=${LDSHARED-"$cc -shared"}
-        LDSHAREDLIBC=""
-        EXE='.exe' ;;
-  QNX*)  # This is for QNX6. I suppose that the QNX rule below is for QNX2,QNX4
-         # (alain.bonnefoy@icbt.com)
-                 LDSHARED=${LDSHARED-"$cc -shared -Wl,-hlibz.so.1"} ;;
-  HP-UX*)
-         LDSHARED=${LDSHARED-"$cc -shared $SFLAGS"}
-         case `(uname -m || echo unknown) 2>/dev/null` in
-         ia64)
-                 shared_ext='.so'
-                 SHAREDLIB='libz.so' ;;
-         *)
-                 shared_ext='.sl'
-                 SHAREDLIB='libz.sl' ;;
-         esac ;;
-  Darwin* | darwin*)
-             shared_ext='.dylib'
-             SHAREDLIB=libz$shared_ext
-             SHAREDLIBV=libz.$VER$shared_ext
-             SHAREDLIBM=libz.$VER1$shared_ext
-             LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER3"}
-             if libtool -V 2>&1 | grep Apple > /dev/null; then
-                 AR="libtool"
-             else
-                 AR="/usr/bin/libtool"
-             fi
-             ARFLAGS="-o" ;;
-  *)             LDSHARED=${LDSHARED-"$cc -shared"} ;;
-  esac
-else
-  # find system name and corresponding cc options
-  CC=${CC-cc}
-  gcc=0
-  echo ... using $CC >> configure.log
-  if test -z "$uname"; then
-    uname=`(uname -sr || echo unknown) 2>/dev/null`
-  fi
-  case "$uname" in
-  HP-UX*)    SFLAGS=${CFLAGS-"-O +z"}
-             CFLAGS=${CFLAGS-"-O"}
-#            LDSHARED=${LDSHARED-"ld -b +vnocompatwarnings"}
-             LDSHARED=${LDSHARED-"ld -b"}
-         case `(uname -m || echo unknown) 2>/dev/null` in
-         ia64)
-             shared_ext='.so'
-             SHAREDLIB='libz.so' ;;
-         *)
-             shared_ext='.sl'
-             SHAREDLIB='libz.sl' ;;
-         esac ;;
-  IRIX*)     SFLAGS=${CFLAGS-"-ansi -O2 -rpath ."}
-             CFLAGS=${CFLAGS-"-ansi -O2"}
-             LDSHARED=${LDSHARED-"cc -shared -Wl,-soname,libz.so.1"} ;;
-  OSF1\ V4*) SFLAGS=${CFLAGS-"-O -std1"}
-             CFLAGS=${CFLAGS-"-O -std1"}
-             LDFLAGS="${LDFLAGS} -Wl,-rpath,."
-             LDSHARED=${LDSHARED-"cc -shared  -Wl,-soname,libz.so -Wl,-msym -Wl,-rpath,$(libdir) -Wl,-set_version,${VER}:1.0"} ;;
-  OSF1*)     SFLAGS=${CFLAGS-"-O -std1"}
-             CFLAGS=${CFLAGS-"-O -std1"}
-             LDSHARED=${LDSHARED-"cc -shared -Wl,-soname,libz.so.1"} ;;
-  QNX*)      SFLAGS=${CFLAGS-"-4 -O"}
-             CFLAGS=${CFLAGS-"-4 -O"}
-             LDSHARED=${LDSHARED-"cc"}
-             RANLIB=${RANLIB-"true"}
-             AR="cc"
-             ARFLAGS="-A" ;;
-  SCO_SV\ 3.2*) SFLAGS=${CFLAGS-"-O3 -dy -KPIC "}
-             CFLAGS=${CFLAGS-"-O3"}
-             LDSHARED=${LDSHARED-"cc -dy -KPIC -G"} ;;
-  SunOS\ 5* | solaris*)
-         LDSHARED=${LDSHARED-"cc -G -h libz$shared_ext.$VER1"}
-         SFLAGS=${CFLAGS-"-fast -KPIC"}
-         CFLAGS=${CFLAGS-"-fast"}
-         if test $build64 -eq 1; then
-             # old versions of SunPRO/Workshop/Studio don't support -m64,
-             # but newer ones do.  Check for it.
-             flag64=`$CC -flags | egrep -- '^-m64'`
-             if test x"$flag64" != x"" ; then
-                 CFLAGS="${CFLAGS} -m64"
-                 SFLAGS="${SFLAGS} -m64"
-             else
-                 case `(uname -m || echo unknown) 2>/dev/null` in
-                   i86*)
-                     SFLAGS="$SFLAGS -xarch=amd64"
-                     CFLAGS="$CFLAGS -xarch=amd64" ;;
-                   *)
-                     SFLAGS="$SFLAGS -xarch=v9"
-                     CFLAGS="$CFLAGS -xarch=v9" ;;
-                 esac
-             fi
-         fi
-         if test -n "$ZINC"; then
-             ZINC='-I- -I. -I$(SRCDIR)'
-         fi
-         ;;
-  SunOS\ 4*) SFLAGS=${CFLAGS-"-O2 -PIC"}
-             CFLAGS=${CFLAGS-"-O2"}
-             LDSHARED=${LDSHARED-"ld"} ;;
-  SunStudio\ 9*) SFLAGS=${CFLAGS-"-fast -xcode=pic32 -xtarget=ultra3 -xarch=v9b"}
-             CFLAGS=${CFLAGS-"-fast -xtarget=ultra3 -xarch=v9b"}
-             LDSHARED=${LDSHARED-"cc -xarch=v9b"} ;;
-  UNIX_System_V\ 4.2.0)
-             SFLAGS=${CFLAGS-"-KPIC -O"}
-             CFLAGS=${CFLAGS-"-O"}
-             LDSHARED=${LDSHARED-"cc -G"} ;;
-  UNIX_SV\ 4.2MP)
-             SFLAGS=${CFLAGS-"-Kconform_pic -O"}
-             CFLAGS=${CFLAGS-"-O"}
-             LDSHARED=${LDSHARED-"cc -G"} ;;
-  OpenUNIX\ 5)
-             SFLAGS=${CFLAGS-"-KPIC -O"}
-             CFLAGS=${CFLAGS-"-O"}
-             LDSHARED=${LDSHARED-"cc -G"} ;;
-  AIX*)  # Courtesy of dbakker@arrayasolutions.com
-             SFLAGS=${CFLAGS-"-O -qmaxmem=8192"}
-             CFLAGS=${CFLAGS-"-O -qmaxmem=8192"}
-             LDSHARED=${LDSHARED-"xlc -G"} ;;
-  # send working options for other systems to zlib@gzip.org
-  *)         SFLAGS=${CFLAGS-"-O"}
-             CFLAGS=${CFLAGS-"-O"}
-             LDSHARED=${LDSHARED-"cc -shared"} ;;
-  esac
-fi
-
-# destination names for shared library if not defined above
-SHAREDLIB=${SHAREDLIB-"libz$shared_ext"}
-SHAREDLIBV=${SHAREDLIBV-"libz$shared_ext.$VER"}
-SHAREDLIBM=${SHAREDLIBM-"libz$shared_ext.$VER1"}
-
-echo >> configure.log
-
-# define functions for testing compiler and library characteristics and logging the results
-
-cat > $test.c <<EOF
-#error error
-EOF
-if ($CC -c $CFLAGS $test.c) 2>/dev/null; then
-  try()
-  {
-    show $*
-    test "`( $* ) 2>&1 | tee -a configure.log`" = ""
-  }
-  echo - using any output from compiler to indicate an error >> configure.log
-else
-  try()
-  {
-    show $*
-    ( $* ) >> configure.log 2>&1
-    ret=$?
-    if test $ret -ne 0; then
-      echo "(exit code "$ret")" >> configure.log
-    fi
-    return $ret
-  }
-fi
-
-tryboth()
-{
-  show $*
-  got=`( $* ) 2>&1`
-  ret=$?
-  printf %s "$got" >> configure.log
-  if test $ret -ne 0; then
-    return $ret
-  fi
-  test "$got" = ""
-}
-
-cat > $test.c << EOF
-int foo() { return 0; }
-EOF
-echo "Checking for obsessive-compulsive compiler options..." >> configure.log
-if try $CC -c $CFLAGS $test.c; then
-  :
-else
-  echo "Compiler error reporting is too harsh for $0 (perhaps remove -Werror)." | tee -a configure.log
-  leave 1
-fi
-
-echo >> configure.log
-
-# see if shared library build supported
-cat > $test.c <<EOF
-extern int getchar();
-int hello() {return getchar();}
-EOF
-if test $shared -eq 1; then
-  echo Checking for shared library support... | tee -a configure.log
-  # we must test in two steps (cc then ld), required at least on SunOS 4.x
-  if try $CC -w -c $SFLAGS $test.c &&
-     try $LDSHARED $SFLAGS -o $test$shared_ext $test.o; then
-    echo Building shared library $SHAREDLIBV with $CC. | tee -a configure.log
-  elif test -z "$old_cc" -a -z "$old_cflags"; then
-    echo No shared library support. | tee -a configure.log
-    shared=0;
-  else
-    echo 'No shared library support; try without defining CC and CFLAGS' | tee -a configure.log
-    shared=0;
-  fi
-fi
-if test $shared -eq 0; then
-  LDSHARED="$CC"
-  ALL="static"
-  TEST="all teststatic"
-  SHAREDLIB=""
-  SHAREDLIBV=""
-  SHAREDLIBM=""
-  echo Building static library $STATICLIB version $VER with $CC. | tee -a configure.log
-else
-  ALL="static shared"
-  TEST="all teststatic testshared"
-fi
-
-# check for underscores in external names for use by assembler code
-CPP=${CPP-"$CC -E"}
-case $CFLAGS in
-  *ASMV*)
-    echo >> configure.log
-    show "$NM $test.o | grep _hello"
-    if test "`$NM $test.o | grep _hello | tee -a configure.log`" = ""; then
-      CPP="$CPP -DNO_UNDERLINE"
-      echo Checking for underline in external names... No. | tee -a configure.log
-    else
-      echo Checking for underline in external names... Yes. | tee -a configure.log
-    fi ;;
-esac
-
-echo >> configure.log
-
-# check for size_t
-cat > $test.c <<EOF
-#include <stdio.h>
-#include <stdlib.h>
-size_t dummy = 0;
-EOF
-if try $CC -c $CFLAGS $test.c; then
-  echo "Checking for size_t... Yes." | tee -a configure.log
-  need_sizet=0
-else
-  echo "Checking for size_t... No." | tee -a configure.log
-  need_sizet=1
-fi
-
-echo >> configure.log
-
-# find the size_t integer type, if needed
-if test $need_sizet -eq 1; then
-  cat > $test.c <<EOF
-long long dummy = 0;
-EOF
-  if try $CC -c $CFLAGS $test.c; then
-    echo "Checking for long long... Yes." | tee -a configure.log
-    cat > $test.c <<EOF
-#include <stdio.h>
-int main(void) {
-    if (sizeof(void *) <= sizeof(int)) puts("int");
-    else if (sizeof(void *) <= sizeof(long)) puts("long");
-    else puts("z_longlong");
-    return 0;
-}
-EOF
-  else
-    echo "Checking for long long... No." | tee -a configure.log
-    cat > $test.c <<EOF
-#include <stdio.h>
-int main(void) {
-    if (sizeof(void *) <= sizeof(int)) puts("int");
-    else puts("long");
-    return 0;
-}
-EOF
-  fi
-  if try $CC $CFLAGS -o $test $test.c; then
-    sizet=`./$test`
-    echo "Checking for a pointer-size integer type..." $sizet"." | tee -a configure.log
-  else
-    echo "Failed to find a pointer-size integer type." | tee -a configure.log
-    leave 1
-  fi
-fi
-
-if test $need_sizet -eq 1; then
-  CFLAGS="${CFLAGS} -DNO_SIZE_T=${sizet}"
-  SFLAGS="${SFLAGS} -DNO_SIZE_T=${sizet}"
-fi
-
-echo >> configure.log
-
-# check for large file support, and if none, check for fseeko()
-cat > $test.c <<EOF
-#include <sys/types.h>
-off64_t dummy = 0;
-EOF
-if try $CC -c $CFLAGS -D_LARGEFILE64_SOURCE=1 $test.c; then
-  CFLAGS="${CFLAGS} -D_LARGEFILE64_SOURCE=1"
-  SFLAGS="${SFLAGS} -D_LARGEFILE64_SOURCE=1"
-  ALL="${ALL} all64"
-  TEST="${TEST} test64"
-  echo "Checking for off64_t... Yes." | tee -a configure.log
-  echo "Checking for fseeko... Yes." | tee -a configure.log
-else
-  echo "Checking for off64_t... No." | tee -a configure.log
-  echo >> configure.log
-  cat > $test.c <<EOF
-#include <stdio.h>
-int main(void) {
-  fseeko(NULL, 0, 0);
-  return 0;
-}
-EOF
-  if try $CC $CFLAGS -o $test $test.c; then
-    echo "Checking for fseeko... Yes." | tee -a configure.log
-  else
-    CFLAGS="${CFLAGS} -DNO_FSEEKO"
-    SFLAGS="${SFLAGS} -DNO_FSEEKO"
-    echo "Checking for fseeko... No." | tee -a configure.log
-  fi
-fi
-
-echo >> configure.log
-
-# check for strerror() for use by gz* functions
-cat > $test.c <<EOF
-#include <string.h>
-#include <errno.h>
-int main() { return strlen(strerror(errno)); }
-EOF
-if try $CC $CFLAGS -o $test $test.c; then
-  echo "Checking for strerror... Yes." | tee -a configure.log
-else
-  CFLAGS="${CFLAGS} -DNO_STRERROR"
-  SFLAGS="${SFLAGS} -DNO_STRERROR"
-  echo "Checking for strerror... No." | tee -a configure.log
-fi
-
-# copy clean zconf.h for subsequent edits
-cp -p ${SRCDIR}zconf.h.in zconf.h
-
-echo >> configure.log
-
-# check for unistd.h and save result in zconf.h
-cat > $test.c <<EOF
-#include <unistd.h>
-int main() { return 0; }
-EOF
-if try $CC -c $CFLAGS $test.c; then
-  sed < zconf.h "/^#ifdef HAVE_UNISTD_H.* may be/s/def HAVE_UNISTD_H\(.*\) may be/ 1\1 was/" > zconf.temp.h
-  mv zconf.temp.h zconf.h
-  echo "Checking for unistd.h... Yes." | tee -a configure.log
-else
-  echo "Checking for unistd.h... No." | tee -a configure.log
-fi
-
-echo >> configure.log
-
-# check for stdarg.h and save result in zconf.h
-cat > $test.c <<EOF
-#include <stdarg.h>
-int main() { return 0; }
-EOF
-if try $CC -c $CFLAGS $test.c; then
-  sed < zconf.h "/^#ifdef HAVE_STDARG_H.* may be/s/def HAVE_STDARG_H\(.*\) may be/ 1\1 was/" > zconf.temp.h
-  mv zconf.temp.h zconf.h
-  echo "Checking for stdarg.h... Yes." | tee -a configure.log
-else
-  echo "Checking for stdarg.h... No." | tee -a configure.log
-fi
-
-# if the z_ prefix was requested, save that in zconf.h
-if test $zprefix -eq 1; then
-  sed < zconf.h "/#ifdef Z_PREFIX.* may be/s/def Z_PREFIX\(.*\) may be/ 1\1 was/" > zconf.temp.h
-  mv zconf.temp.h zconf.h
-  echo >> configure.log
-  echo "Using z_ prefix on all symbols." | tee -a configure.log
-fi
-
-# if --solo compilation was requested, save that in zconf.h and remove gz stuff from object lists
-if test $solo -eq 1; then
-  sed '/#define ZCONF_H/a\
-#define Z_SOLO
-
-' < zconf.h > zconf.temp.h
-  mv zconf.temp.h zconf.h
-OBJC='$(OBJZ)'
-PIC_OBJC='$(PIC_OBJZ)'
-fi
-
-# if code coverage testing was requested, use older gcc if defined, e.g. "gcc-4.2" on Mac OS X
-if test $cover -eq 1; then
-  CFLAGS="${CFLAGS} -fprofile-arcs -ftest-coverage"
-  if test -n "$GCC_CLASSIC"; then
-    CC=$GCC_CLASSIC
-  fi
-fi
-
-echo >> configure.log
-
-# conduct a series of tests to resolve eight possible cases of using "vs" or "s" printf functions
-# (using stdarg or not), with or without "n" (proving size of buffer), and with or without a
-# return value.  The most secure result is vsnprintf() with a return value.  snprintf() with a
-# return value is secure as well, but then gzprintf() will be limited to 20 arguments.
-cat > $test.c <<EOF
-#include <stdio.h>
-#include <stdarg.h>
-#include "zconf.h"
-int main()
-{
-#ifndef STDC
-  choke me
-#endif
-  return 0;
-}
-EOF
-if try $CC -c $CFLAGS $test.c; then
-  echo "Checking whether to use vs[n]printf() or s[n]printf()... using vs[n]printf()." | tee -a configure.log
-
-  echo >> configure.log
-  cat > $test.c <<EOF
-#include <stdio.h>
-#include <stdarg.h>
-int mytest(const char *fmt, ...)
-{
-  char buf[20];
-  va_list ap;
-  va_start(ap, fmt);
-  vsnprintf(buf, sizeof(buf), fmt, ap);
-  va_end(ap);
-  return 0;
-}
-int main()
-{
-  return (mytest("Hello%d\n", 1));
-}
-EOF
-  if try $CC $CFLAGS -o $test $test.c; then
-    echo "Checking for vsnprintf() in stdio.h... Yes." | tee -a configure.log
-
-    echo >> configure.log
-    cat >$test.c <<EOF
-#include <stdio.h>
-#include <stdarg.h>
-int mytest(const char *fmt, ...)
-{
-  int n;
-  char buf[20];
-  va_list ap;
-  va_start(ap, fmt);
-  n = vsnprintf(buf, sizeof(buf), fmt, ap);
-  va_end(ap);
-  return n;
-}
-int main()
-{
-  return (mytest("Hello%d\n", 1));
-}
-EOF
-
-    if try $CC -c $CFLAGS $test.c; then
-      echo "Checking for return value of vsnprintf()... Yes." | tee -a configure.log
-    else
-      CFLAGS="$CFLAGS -DHAS_vsnprintf_void"
-      SFLAGS="$SFLAGS -DHAS_vsnprintf_void"
-      echo "Checking for return value of vsnprintf()... No." | tee -a configure.log
-      echo "  WARNING: apparently vsnprintf() does not return a value. zlib" | tee -a configure.log
-      echo "  can build but will be open to possible string-format security" | tee -a configure.log
-      echo "  vulnerabilities." | tee -a configure.log
-    fi
-  else
-    CFLAGS="$CFLAGS -DNO_vsnprintf"
-    SFLAGS="$SFLAGS -DNO_vsnprintf"
-    echo "Checking for vsnprintf() in stdio.h... No." | tee -a configure.log
-    echo "  WARNING: vsnprintf() not found, falling back to vsprintf(). zlib" | tee -a configure.log
-    echo "  can build but will be open to possible buffer-overflow security" | tee -a configure.log
-    echo "  vulnerabilities." | tee -a configure.log
-
-    echo >> configure.log
-    cat >$test.c <<EOF
-#include <stdio.h>
-#include <stdarg.h>
-int mytest(const char *fmt, ...)
-{
-  int n;
-  char buf[20];
-  va_list ap;
-  va_start(ap, fmt);
-  n = vsprintf(buf, fmt, ap);
-  va_end(ap);
-  return n;
-}
-int main()
-{
-  return (mytest("Hello%d\n", 1));
-}
-EOF
-
-    if try $CC -c $CFLAGS $test.c; then
-      echo "Checking for return value of vsprintf()... Yes." | tee -a configure.log
-    else
-      CFLAGS="$CFLAGS -DHAS_vsprintf_void"
-      SFLAGS="$SFLAGS -DHAS_vsprintf_void"
-      echo "Checking for return value of vsprintf()... No." | tee -a configure.log
-      echo "  WARNING: apparently vsprintf() does not return a value. zlib" | tee -a configure.log
-      echo "  can build but will be open to possible string-format security" | tee -a configure.log
-      echo "  vulnerabilities." | tee -a configure.log
-    fi
-  fi
-else
-  echo "Checking whether to use vs[n]printf() or s[n]printf()... using s[n]printf()." | tee -a configure.log
-
-  echo >> configure.log
-  cat >$test.c <<EOF
-#include <stdio.h>
-int mytest()
-{
-  char buf[20];
-  snprintf(buf, sizeof(buf), "%s", "foo");
-  return 0;
-}
-int main()
-{
-  return (mytest());
-}
-EOF
-
-  if try $CC $CFLAGS -o $test $test.c; then
-    echo "Checking for snprintf() in stdio.h... Yes." | tee -a configure.log
-
-    echo >> configure.log
-    cat >$test.c <<EOF
-#include <stdio.h>
-int mytest()
-{
-  char buf[20];
-  return snprintf(buf, sizeof(buf), "%s", "foo");
-}
-int main()
-{
-  return (mytest());
-}
-EOF
-
-    if try $CC -c $CFLAGS $test.c; then
-      echo "Checking for return value of snprintf()... Yes." | tee -a configure.log
-    else
-      CFLAGS="$CFLAGS -DHAS_snprintf_void"
-      SFLAGS="$SFLAGS -DHAS_snprintf_void"
-      echo "Checking for return value of snprintf()... No." | tee -a configure.log
-      echo "  WARNING: apparently snprintf() does not return a value. zlib" | tee -a configure.log
-      echo "  can build but will be open to possible string-format security" | tee -a configure.log
-      echo "  vulnerabilities." | tee -a configure.log
-    fi
-  else
-    CFLAGS="$CFLAGS -DNO_snprintf"
-    SFLAGS="$SFLAGS -DNO_snprintf"
-    echo "Checking for snprintf() in stdio.h... No." | tee -a configure.log
-    echo "  WARNING: snprintf() not found, falling back to sprintf(). zlib" | tee -a configure.log
-    echo "  can build but will be open to possible buffer-overflow security" | tee -a configure.log
-    echo "  vulnerabilities." | tee -a configure.log
-
-    echo >> configure.log
-    cat >$test.c <<EOF
-#include <stdio.h>
-int mytest()
-{
-  char buf[20];
-  return sprintf(buf, "%s", "foo");
-}
-int main()
-{
-  return (mytest());
-}
-EOF
-
-    if try $CC -c $CFLAGS $test.c; then
-      echo "Checking for return value of sprintf()... Yes." | tee -a configure.log
-    else
-      CFLAGS="$CFLAGS -DHAS_sprintf_void"
-      SFLAGS="$SFLAGS -DHAS_sprintf_void"
-      echo "Checking for return value of sprintf()... No." | tee -a configure.log
-      echo "  WARNING: apparently sprintf() does not return a value. zlib" | tee -a configure.log
-      echo "  can build but will be open to possible string-format security" | tee -a configure.log
-      echo "  vulnerabilities." | tee -a configure.log
-    fi
-  fi
-fi
-
-# see if we can hide zlib internal symbols that are linked between separate source files
-if test "$gcc" -eq 1; then
-  echo >> configure.log
-  cat > $test.c <<EOF
-#define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
-int ZLIB_INTERNAL foo;
-int main()
-{
-  return 0;
-}
-EOF
-  if tryboth $CC -c $CFLAGS $test.c; then
-    CFLAGS="$CFLAGS -DHAVE_HIDDEN"
-    SFLAGS="$SFLAGS -DHAVE_HIDDEN"
-    echo "Checking for attribute(visibility) support... Yes." | tee -a configure.log
-  else
-    echo "Checking for attribute(visibility) support... No." | tee -a configure.log
-  fi
-fi
-
-# show the results in the log
-echo >> configure.log
-echo ALL = $ALL >> configure.log
-echo AR = $AR >> configure.log
-echo ARFLAGS = $ARFLAGS >> configure.log
-echo CC = $CC >> configure.log
-echo CFLAGS = $CFLAGS >> configure.log
-echo CPP = $CPP >> configure.log
-echo EXE = $EXE >> configure.log
-echo LDCONFIG = $LDCONFIG >> configure.log
-echo LDFLAGS = $LDFLAGS >> configure.log
-echo LDSHARED = $LDSHARED >> configure.log
-echo LDSHAREDLIBC = $LDSHAREDLIBC >> configure.log
-echo OBJC = $OBJC >> configure.log
-echo PIC_OBJC = $PIC_OBJC >> configure.log
-echo RANLIB = $RANLIB >> configure.log
-echo SFLAGS = $SFLAGS >> configure.log
-echo SHAREDLIB = $SHAREDLIB >> configure.log
-echo SHAREDLIBM = $SHAREDLIBM >> configure.log
-echo SHAREDLIBV = $SHAREDLIBV >> configure.log
-echo STATICLIB = $STATICLIB >> configure.log
-echo TEST = $TEST >> configure.log
-echo VER = $VER >> configure.log
-echo Z_U4 = $Z_U4 >> configure.log
-echo SRCDIR = $SRCDIR >> configure.log
-echo exec_prefix = $exec_prefix >> configure.log
-echo includedir = $includedir >> configure.log
-echo libdir = $libdir >> configure.log
-echo mandir = $mandir >> configure.log
-echo prefix = $prefix >> configure.log
-echo sharedlibdir = $sharedlibdir >> configure.log
-echo uname = $uname >> configure.log
-
-# udpate Makefile with the configure results
-sed < ${SRCDIR}Makefile.in "
-/^CC *=/s#=.*#=$CC#
-/^CFLAGS *=/s#=.*#=$CFLAGS#
-/^SFLAGS *=/s#=.*#=$SFLAGS#
-/^LDFLAGS *=/s#=.*#=$LDFLAGS#
-/^LDSHARED *=/s#=.*#=$LDSHARED#
-/^CPP *=/s#=.*#=$CPP#
-/^STATICLIB *=/s#=.*#=$STATICLIB#
-/^SHAREDLIB *=/s#=.*#=$SHAREDLIB#
-/^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV#
-/^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM#
-/^AR *=/s#=.*#=$AR#
-/^ARFLAGS *=/s#=.*#=$ARFLAGS#
-/^RANLIB *=/s#=.*#=$RANLIB#
-/^LDCONFIG *=/s#=.*#=$LDCONFIG#
-/^LDSHAREDLIBC *=/s#=.*#=$LDSHAREDLIBC#
-/^EXE *=/s#=.*#=$EXE#
-/^SRCDIR *=/s#=.*#=$SRCDIR#
-/^ZINC *=/s#=.*#=$ZINC#
-/^ZINCOUT *=/s#=.*#=$ZINCOUT#
-/^prefix *=/s#=.*#=$prefix#
-/^exec_prefix *=/s#=.*#=$exec_prefix#
-/^libdir *=/s#=.*#=$libdir#
-/^sharedlibdir *=/s#=.*#=$sharedlibdir#
-/^includedir *=/s#=.*#=$includedir#
-/^mandir *=/s#=.*#=$mandir#
-/^OBJC *=/s#=.*#= $OBJC#
-/^PIC_OBJC *=/s#=.*#= $PIC_OBJC#
-/^all: */s#:.*#: $ALL#
-/^test: */s#:.*#: $TEST#
-" > Makefile
-
-# create zlib.pc with the configure results
-sed < ${SRCDIR}zlib.pc.in "
-/^CC *=/s#=.*#=$CC#
-/^CFLAGS *=/s#=.*#=$CFLAGS#
-/^CPP *=/s#=.*#=$CPP#
-/^LDSHARED *=/s#=.*#=$LDSHARED#
-/^STATICLIB *=/s#=.*#=$STATICLIB#
-/^SHAREDLIB *=/s#=.*#=$SHAREDLIB#
-/^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV#
-/^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM#
-/^AR *=/s#=.*#=$AR#
-/^ARFLAGS *=/s#=.*#=$ARFLAGS#
-/^RANLIB *=/s#=.*#=$RANLIB#
-/^EXE *=/s#=.*#=$EXE#
-/^prefix *=/s#=.*#=$prefix#
-/^exec_prefix *=/s#=.*#=$exec_prefix#
-/^libdir *=/s#=.*#=$libdir#
-/^sharedlibdir *=/s#=.*#=$sharedlibdir#
-/^includedir *=/s#=.*#=$includedir#
-/^mandir *=/s#=.*#=$mandir#
-/^LDFLAGS *=/s#=.*#=$LDFLAGS#
-" | sed -e "
-s/\@VERSION\@/$VER/g;
-" > zlib.pc
-
-# done
-leave 0
diff --git a/src/png/zlib/contrib/README.contrib b/src/png/zlib/contrib/README.contrib
deleted file mode 100644
index a411d5c39..000000000
--- a/src/png/zlib/contrib/README.contrib
+++ /dev/null
@@ -1,78 +0,0 @@
-All files under this contrib directory are UNSUPPORTED. There were
-provided by users of zlib and were not tested by the authors of zlib.
-Use at your own risk. Please contact the authors of the contributions
-for help about these, not the zlib authors. Thanks.
-
-
-ada/        by Dmitriy Anisimkov <anisimkov@yahoo.com>
-        Support for Ada
-        See http://zlib-ada.sourceforge.net/
-
-amd64/      by Mikhail Teterin <mi@ALDAN.algebra.com>
-        asm code for AMD64
-        See patch at http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/96393
-
-asm686/     by Brian Raiter <breadbox@muppetlabs.com>
-        asm code for Pentium and PPro/PII, using the AT&T (GNU as) syntax
-        See http://www.muppetlabs.com/~breadbox/software/assembly.html
-
-blast/      by Mark Adler <madler@alumni.caltech.edu>
-        Decompressor for output of PKWare Data Compression Library (DCL)
-
-delphi/     by Cosmin Truta <cosmint@cs.ubbcluj.ro>
-        Support for Delphi and C++ Builder
-
-dotzlib/    by Henrik Ravn <henrik@ravn.com>
-        Support for Microsoft .Net and Visual C++ .Net
-
-gcc_gvmat64/by Gilles Vollant <info@winimage.com>
-        GCC Version of x86 64-bit (AMD64 and Intel EM64t) code for x64
-        assembler to replace longest_match() and inflate_fast()
-
-infback9/   by Mark Adler <madler@alumni.caltech.edu>
-        Unsupported diffs to infback to decode the deflate64 format
-
-inflate86/  by Chris Anderson <christop@charm.net>
-        Tuned x86 gcc asm code to replace inflate_fast()
-
-iostream/   by Kevin Ruland <kevin@rodin.wustl.edu>
-        A C++ I/O streams interface to the zlib gz* functions
-
-iostream2/  by Tyge Løvset <Tyge.Lovset@cmr.no>
-        Another C++ I/O streams interface
-
-iostream3/  by Ludwig Schwardt <schwardt@sun.ac.za>
-            and Kevin Ruland <kevin@rodin.wustl.edu>
-        Yet another C++ I/O streams interface
-
-masmx64/    by Gilles Vollant <info@winimage.com>
-        x86 64-bit (AMD64 and Intel EM64t) code for x64 assembler to
-        replace longest_match() and inflate_fast(),  also masm x86
-        64-bits translation of Chris Anderson inflate_fast()
-
-masmx86/    by Gilles Vollant <info@winimage.com>
-        x86 asm code to replace longest_match() and inflate_fast(),
-        for Visual C++ and MASM (32 bits).
-        Based on Brian Raiter (asm686) and Chris Anderson (inflate86)
-
-minizip/    by Gilles Vollant <info@winimage.com>
-        Mini zip and unzip based on zlib
-        Includes Zip64 support by Mathias Svensson <mathias@result42.com>
-        See http://www.winimage.com/zLibDll/minizip.html
-
-pascal/     by Bob Dellaca <bobdl@xtra.co.nz> et al.
-        Support for Pascal
-
-puff/       by Mark Adler <madler@alumni.caltech.edu>
-        Small, low memory usage inflate.  Also serves to provide an
-        unambiguous description of the deflate format.
-
-testzlib/   by Gilles Vollant <info@winimage.com>
-        Example of the use of zlib
-
-untgz/      by Pedro A. Aranda Gutierrez <paag@tid.es>
-        A very simple tar.gz file extractor using zlib
-
-vstudio/    by Gilles Vollant <info@winimage.com>
-        Building a minizip-enhanced zlib with Microsoft Visual Studio
-        Includes vc11 from kreuzerkrieg and vc12 from davispuh
diff --git a/src/png/zlib/contrib/ada/buffer_demo.adb b/src/png/zlib/contrib/ada/buffer_demo.adb
deleted file mode 100644
index 46b863810..000000000
--- a/src/png/zlib/contrib/ada/buffer_demo.adb
+++ /dev/null
@@ -1,106 +0,0 @@
-----------------------------------------------------------------
---  ZLib for Ada thick binding.                               --
---                                                            --
---  Copyright (C) 2002-2004 Dmitriy Anisimkov                 --
---                                                            --
---  Open source license information is in the zlib.ads file.  --
-----------------------------------------------------------------
---
---  $Id: buffer_demo.adb,v 1.3 2004/09/06 06:55:35 vagul Exp $
-
---  This demo program provided by Dr Steve Sangwine <sjs@essex.ac.uk>
---
---  Demonstration of a problem with Zlib-Ada (already fixed) when a buffer
---  of exactly the correct size is used for decompressed data, and the last
---  few bytes passed in to Zlib are checksum bytes.
-
---  This program compresses a string of text, and then decompresses the
---  compressed text into a buffer of the same size as the original text.
-
-with Ada.Streams; use Ada.Streams;
-with Ada.Text_IO;
-
-with ZLib; use ZLib;
-
-procedure Buffer_Demo is
-   EOL  : Character renames ASCII.LF;
-   Text : constant String
-     := "Four score and seven years ago our fathers brought forth," & EOL &
-        "upon this continent, a new nation, conceived in liberty," & EOL &
-        "and dedicated to the proposition that `all men are created equal'.";
-
-   Source : Stream_Element_Array (1 .. Text'Length);
-   for Source'Address use Text'Address;
-
-begin
-   Ada.Text_IO.Put (Text);
-   Ada.Text_IO.New_Line;
-   Ada.Text_IO.Put_Line
-     ("Uncompressed size : " & Positive'Image (Text'Length) & " bytes");
-
-   declare
-      Compressed_Data : Stream_Element_Array (1 .. Text'Length);
-      L               : Stream_Element_Offset;
-   begin
-      Compress : declare
-         Compressor : Filter_Type;
-         I : Stream_Element_Offset;
-      begin
-         Deflate_Init (Compressor);
-
-         --  Compress the whole of T at once.
-
-         Translate (Compressor, Source, I, Compressed_Data, L, Finish);
-         pragma Assert (I = Source'Last);
-
-         Close (Compressor);
-
-         Ada.Text_IO.Put_Line
-           ("Compressed size :   "
-            & Stream_Element_Offset'Image (L) & " bytes");
-      end Compress;
-
-      --  Now we decompress the data, passing short blocks of data to Zlib
-      --  (because this demonstrates the problem - the last block passed will
-      --  contain checksum information and there will be no output, only a
-      --  check inside Zlib that the checksum is correct).
-
-      Decompress : declare
-         Decompressor : Filter_Type;
-
-         Uncompressed_Data : Stream_Element_Array (1 .. Text'Length);
-
-         Block_Size : constant := 4;
-         --  This makes sure that the last block contains
-         --  only Adler checksum data.
-
-         P : Stream_Element_Offset := Compressed_Data'First - 1;
-         O : Stream_Element_Offset;
-      begin
-         Inflate_Init (Decompressor);
-
-         loop
-            Translate
-              (Decompressor,
-               Compressed_Data
-                 (P + 1 .. Stream_Element_Offset'Min (P + Block_Size, L)),
-               P,
-               Uncompressed_Data
-                 (Total_Out (Decompressor) + 1 .. Uncompressed_Data'Last),
-               O,
-               No_Flush);
-
-               Ada.Text_IO.Put_Line
-                 ("Total in : " & Count'Image (Total_In (Decompressor)) &
-                  ", out : " & Count'Image (Total_Out (Decompressor)));
-
-               exit when P = L;
-         end loop;
-
-         Ada.Text_IO.New_Line;
-         Ada.Text_IO.Put_Line
-           ("Decompressed text matches original text : "
-             & Boolean'Image (Uncompressed_Data = Source));
-      end Decompress;
-   end;
-end Buffer_Demo;
diff --git a/src/png/zlib/contrib/ada/mtest.adb b/src/png/zlib/contrib/ada/mtest.adb
deleted file mode 100644
index c4dfd080f..000000000
--- a/src/png/zlib/contrib/ada/mtest.adb
+++ /dev/null
@@ -1,156 +0,0 @@
-----------------------------------------------------------------
---  ZLib for Ada thick binding.                               --
---                                                            --
---  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
---                                                            --
---  Open source license information is in the zlib.ads file.  --
-----------------------------------------------------------------
---  Continuous test for ZLib multithreading. If the test would fail
---  we should provide thread safe allocation routines for the Z_Stream.
---
---  $Id: mtest.adb,v 1.4 2004/07/23 07:49:54 vagul Exp $
-
-with ZLib;
-with Ada.Streams;
-with Ada.Numerics.Discrete_Random;
-with Ada.Text_IO;
-with Ada.Exceptions;
-with Ada.Task_Identification;
-
-procedure MTest is
-   use Ada.Streams;
-   use ZLib;
-
-   Stop : Boolean := False;
-
-   pragma Atomic (Stop);
-
-   subtype Visible_Symbols is Stream_Element range 16#20# .. 16#7E#;
-
-   package Random_Elements is
-      new Ada.Numerics.Discrete_Random (Visible_Symbols);
-
-   task type Test_Task;
-
-   task body Test_Task is
-      Buffer : Stream_Element_Array (1 .. 100_000);
-      Gen : Random_Elements.Generator;
-
-      Buffer_First  : Stream_Element_Offset;
-      Compare_First : Stream_Element_Offset;
-
-      Deflate : Filter_Type;
-      Inflate : Filter_Type;
-
-      procedure Further (Item : in Stream_Element_Array);
-
-      procedure Read_Buffer
-        (Item : out Ada.Streams.Stream_Element_Array;
-         Last : out Ada.Streams.Stream_Element_Offset);
-
-      -------------
-      -- Further --
-      -------------
-
-      procedure Further (Item : in Stream_Element_Array) is
-
-         procedure Compare (Item : in Stream_Element_Array);
-
-         -------------
-         -- Compare --
-         -------------
-
-         procedure Compare (Item : in Stream_Element_Array) is
-            Next_First : Stream_Element_Offset := Compare_First + Item'Length;
-         begin
-            if Buffer (Compare_First .. Next_First - 1) /= Item then
-               raise Program_Error;
-            end if;
-
-            Compare_First := Next_First;
-         end Compare;
-
-         procedure Compare_Write is new ZLib.Write (Write => Compare);
-      begin
-         Compare_Write (Inflate, Item, No_Flush);
-      end Further;
-
-      -----------------
-      -- Read_Buffer --
-      -----------------
-
-      procedure Read_Buffer
-        (Item : out Ada.Streams.Stream_Element_Array;
-         Last : out Ada.Streams.Stream_Element_Offset)
-      is
-         Buff_Diff   : Stream_Element_Offset := Buffer'Last - Buffer_First;
-         Next_First : Stream_Element_Offset;
-      begin
-         if Item'Length <= Buff_Diff then
-            Last := Item'Last;
-
-            Next_First := Buffer_First + Item'Length;
-
-            Item := Buffer (Buffer_First .. Next_First - 1);
-
-            Buffer_First := Next_First;
-         else
-            Last := Item'First + Buff_Diff;
-            Item (Item'First .. Last) := Buffer (Buffer_First .. Buffer'Last);
-            Buffer_First := Buffer'Last + 1;
-         end if;
-      end Read_Buffer;
-
-      procedure Translate is new Generic_Translate
-                                   (Data_In  => Read_Buffer,
-                                    Data_Out => Further);
-
-   begin
-      Random_Elements.Reset (Gen);
-
-      Buffer := (others => 20);
-
-      Main : loop
-         for J in Buffer'Range loop
-            Buffer (J) := Random_Elements.Random (Gen);
-
-            Deflate_Init (Deflate);
-            Inflate_Init (Inflate);
-
-            Buffer_First  := Buffer'First;
-            Compare_First := Buffer'First;
-
-            Translate (Deflate);
-
-            if Compare_First /= Buffer'Last + 1 then
-               raise Program_Error;
-            end if;
-
-            Ada.Text_IO.Put_Line
-              (Ada.Task_Identification.Image
-                 (Ada.Task_Identification.Current_Task)
-               & Stream_Element_Offset'Image (J)
-               & ZLib.Count'Image (Total_Out (Deflate)));
-
-            Close (Deflate);
-            Close (Inflate);
-
-            exit Main when Stop;
-         end loop;
-      end loop Main;
-   exception
-      when E : others =>
-         Ada.Text_IO.Put_Line (Ada.Exceptions.Exception_Information (E));
-         Stop := True;
-   end Test_Task;
-
-   Test : array (1 .. 4) of Test_Task;
-
-   pragma Unreferenced (Test);
-
-   Dummy : Character;
-
-begin
-   Ada.Text_IO.Get_Immediate (Dummy);
-   Stop := True;
-end MTest;
diff --git a/src/png/zlib/contrib/ada/read.adb b/src/png/zlib/contrib/ada/read.adb
deleted file mode 100644
index 1f2efbfeb..000000000
--- a/src/png/zlib/contrib/ada/read.adb
+++ /dev/null
@@ -1,156 +0,0 @@
-----------------------------------------------------------------
---  ZLib for Ada thick binding.                               --
---                                                            --
---  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
---                                                            --
---  Open source license information is in the zlib.ads file.  --
-----------------------------------------------------------------
-
---  $Id: read.adb,v 1.8 2004/05/31 10:53:40 vagul Exp $
-
---  Test/demo program for the generic read interface.
-
-with Ada.Numerics.Discrete_Random;
-with Ada.Streams;
-with Ada.Text_IO;
-
-with ZLib;
-
-procedure Read is
-
-   use Ada.Streams;
-
-   ------------------------------------
-   --  Test configuration parameters --
-   ------------------------------------
-
-   File_Size   : Stream_Element_Offset := 100_000;
-
-   Continuous  : constant Boolean          := False;
-   --  If this constant is True, the test would be repeated again and again,
-   --  with increment File_Size for every iteration.
-
-   Header      : constant ZLib.Header_Type := ZLib.Default;
-   --  Do not use Header other than Default in ZLib versions 1.1.4 and older.
-
-   Init_Random : constant := 8;
-   --  We are using the same random sequence, in case of we catch bug,
-   --  so we would be able to reproduce it.
-
-   -- End --
-
-   Pack_Size : Stream_Element_Offset;
-   Offset    : Stream_Element_Offset;
-
-   Filter     : ZLib.Filter_Type;
-
-   subtype Visible_Symbols
-      is Stream_Element range 16#20# .. 16#7E#;
-
-   package Random_Elements is new
-      Ada.Numerics.Discrete_Random (Visible_Symbols);
-
-   Gen : Random_Elements.Generator;
-   Period  : constant Stream_Element_Offset := 200;
-   --  Period constant variable for random generator not to be very random.
-   --  Bigger period, harder random.
-
-   Read_Buffer : Stream_Element_Array (1 .. 2048);
-   Read_First  : Stream_Element_Offset;
-   Read_Last   : Stream_Element_Offset;
-
-   procedure Reset;
-
-   procedure Read
-     (Item : out Stream_Element_Array;
-      Last : out Stream_Element_Offset);
-   --  this procedure is for generic instantiation of
-   --  ZLib.Read
-   --  reading data from the File_In.
-
-   procedure Read is new ZLib.Read
-                           (Read,
-                            Read_Buffer,
-                            Rest_First => Read_First,
-                            Rest_Last  => Read_Last);
-
-   ----------
-   -- Read --
-   ----------
-
-   procedure Read
-     (Item : out Stream_Element_Array;
-      Last : out Stream_Element_Offset) is
-   begin
-      Last := Stream_Element_Offset'Min
-               (Item'Last,
-                Item'First + File_Size - Offset);
-
-      for J in Item'First .. Last loop
-         if J < Item'First + Period then
-            Item (J) := Random_Elements.Random (Gen);
-         else
-            Item (J) := Item (J - Period);
-         end if;
-
-         Offset   := Offset + 1;
-      end loop;
-   end Read;
-
-   -----------
-   -- Reset --
-   -----------
-
-   procedure Reset is
-   begin
-      Random_Elements.Reset (Gen, Init_Random);
-      Pack_Size := 0;
-      Offset := 1;
-      Read_First := Read_Buffer'Last + 1;
-      Read_Last  := Read_Buffer'Last;
-   end Reset;
-
-begin
-   Ada.Text_IO.Put_Line ("ZLib " & ZLib.Version);
-
-   loop
-      for Level in ZLib.Compression_Level'Range loop
-
-         Ada.Text_IO.Put ("Level ="
-            & ZLib.Compression_Level'Image (Level));
-
-         --  Deflate using generic instantiation.
-
-         ZLib.Deflate_Init
-               (Filter,
-                Level,
-                Header => Header);
-
-         Reset;
-
-         Ada.Text_IO.Put
-           (Stream_Element_Offset'Image (File_Size) & " ->");
-
-         loop
-            declare
-               Buffer : Stream_Element_Array (1 .. 1024);
-               Last   : Stream_Element_Offset;
-            begin
-               Read (Filter, Buffer, Last);
-
-               Pack_Size := Pack_Size + Last - Buffer'First + 1;
-
-               exit when Last < Buffer'Last;
-            end;
-         end loop;
-
-         Ada.Text_IO.Put_Line (Stream_Element_Offset'Image (Pack_Size));
-
-         ZLib.Close (Filter);
-      end loop;
-
-      exit when not Continuous;
-
-      File_Size := File_Size + 1;
-   end loop;
-end Read;
diff --git a/src/png/zlib/contrib/ada/readme.txt b/src/png/zlib/contrib/ada/readme.txt
deleted file mode 100644
index ce4d2cadf..000000000
--- a/src/png/zlib/contrib/ada/readme.txt
+++ /dev/null
@@ -1,65 +0,0 @@
-                        ZLib for Ada thick binding (ZLib.Ada)
-                        Release 1.3
-
-ZLib.Ada is a thick binding interface to the popular ZLib data
-compression library, available at http://www.gzip.org/zlib/.
-It provides Ada-style access to the ZLib C library.
-
-
-        Here are the main changes since ZLib.Ada 1.2:
-
-- Attension: ZLib.Read generic routine have a initialization requirement
-  for Read_Last parameter now. It is a bit incompartible with previous version,
-  but extends functionality, we could use new parameters Allow_Read_Some and
-  Flush now.
-
-- Added Is_Open routines to ZLib and ZLib.Streams packages.
-
-- Add pragma Assert to check Stream_Element is 8 bit.
-
-- Fix extraction to buffer with exact known decompressed size. Error reported by
-  Steve Sangwine.
-
-- Fix definition of ULong (changed to unsigned_long), fix regression on 64 bits
-  computers. Patch provided by Pascal Obry.
-
-- Add Status_Error exception definition.
-
-- Add pragma Assertion that Ada.Streams.Stream_Element size is 8 bit.
-
-
-        How to build ZLib.Ada under GNAT
-
-You should have the ZLib library already build on your computer, before
-building ZLib.Ada. Make the directory of ZLib.Ada sources current and
-issue the command:
-
-  gnatmake test -largs -L<directory where libz.a is> -lz
-
-Or use the GNAT project file build for GNAT 3.15 or later:
-
-  gnatmake -Pzlib.gpr -L<directory where libz.a is>
-
-
-        How to build ZLib.Ada under Aonix ObjectAda for Win32 7.2.2
-
-1. Make a project with all *.ads and *.adb files from the distribution.
-2. Build the libz.a library from the ZLib C sources.
-3. Rename libz.a to z.lib.
-4. Add the library z.lib to the project.
-5. Add the libc.lib library from the ObjectAda distribution to the project.
-6. Build the executable using test.adb as a main procedure.
-
-
-        How to use ZLib.Ada
-
-The source files test.adb and read.adb are small demo programs that show
-the main functionality of ZLib.Ada.
-
-The routines from the package specifications are commented.
-
-
-Homepage: http://zlib-ada.sourceforge.net/
-Author: Dmitriy Anisimkov <anisimkov@yahoo.com>
-
-Contributors: Pascal Obry <pascal@obry.org>, Steve Sangwine <sjs@essex.ac.uk>
diff --git a/src/png/zlib/contrib/ada/test.adb b/src/png/zlib/contrib/ada/test.adb
deleted file mode 100644
index 90773acfa..000000000
--- a/src/png/zlib/contrib/ada/test.adb
+++ /dev/null
@@ -1,463 +0,0 @@
-----------------------------------------------------------------
---  ZLib for Ada thick binding.                               --
---                                                            --
---  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
---                                                            --
---  Open source license information is in the zlib.ads file.  --
-----------------------------------------------------------------
-
---  $Id: test.adb,v 1.17 2003/08/12 12:13:30 vagul Exp $
-
---  The program has a few aims.
---  1. Test ZLib.Ada95 thick binding functionality.
---  2. Show the example of use main functionality of the ZLib.Ada95 binding.
---  3. Build this program automatically compile all ZLib.Ada95 packages under
---     GNAT Ada95 compiler.
-
-with ZLib.Streams;
-with Ada.Streams.Stream_IO;
-with Ada.Numerics.Discrete_Random;
-
-with Ada.Text_IO;
-
-with Ada.Calendar;
-
-procedure Test is
-
-   use Ada.Streams;
-   use Stream_IO;
-
-   ------------------------------------
-   --  Test configuration parameters --
-   ------------------------------------
-
-   File_Size   : Count   := 100_000;
-   Continuous  : constant Boolean := False;
-
-   Header      : constant ZLib.Header_Type := ZLib.Default;
-                                              --  ZLib.None;
-                                              --  ZLib.Auto;
-                                              --  ZLib.GZip;
-   --  Do not use Header other then Default in ZLib versions 1.1.4
-   --  and older.
-
-   Strategy    : constant ZLib.Strategy_Type := ZLib.Default_Strategy;
-   Init_Random : constant := 10;
-
-   -- End --
-
-   In_File_Name  : constant String := "testzlib.in";
-   --  Name of the input file
-
-   Z_File_Name   : constant String := "testzlib.zlb";
-   --  Name of the compressed file.
-
-   Out_File_Name : constant String := "testzlib.out";
-   --  Name of the decompressed file.
-
-   File_In   : File_Type;
-   File_Out  : File_Type;
-   File_Back : File_Type;
-   File_Z    : ZLib.Streams.Stream_Type;
-
-   Filter : ZLib.Filter_Type;
-
-   Time_Stamp : Ada.Calendar.Time;
-
-   procedure Generate_File;
-   --  Generate file of spetsified size with some random data.
-   --  The random data is repeatable, for the good compression.
-
-   procedure Compare_Streams
-     (Left, Right : in out Root_Stream_Type'Class);
-   --  The procedure compearing data in 2 streams.
-   --  It is for compare data before and after compression/decompression.
-
-   procedure Compare_Files (Left, Right : String);
-   --  Compare files. Based on the Compare_Streams.
-
-   procedure Copy_Streams
-     (Source, Target : in out Root_Stream_Type'Class;
-      Buffer_Size    : in     Stream_Element_Offset := 1024);
-   --  Copying data from one stream to another. It is for test stream
-   --  interface of the library.
-
-   procedure Data_In
-     (Item : out Stream_Element_Array;
-      Last : out Stream_Element_Offset);
-   --  this procedure is for generic instantiation of
-   --  ZLib.Generic_Translate.
-   --  reading data from the File_In.
-
-   procedure Data_Out (Item : in Stream_Element_Array);
-   --  this procedure is for generic instantiation of
-   --  ZLib.Generic_Translate.
-   --  writing data to the File_Out.
-
-   procedure Stamp;
-   --  Store the timestamp to the local variable.
-
-   procedure Print_Statistic (Msg : String; Data_Size : ZLib.Count);
-   --  Print the time statistic with the message.
-
-   procedure Translate is new ZLib.Generic_Translate
-                                (Data_In  => Data_In,
-                                 Data_Out => Data_Out);
-   --  This procedure is moving data from File_In to File_Out
-   --  with compression or decompression, depend on initialization of
-   --  Filter parameter.
-
-   -------------------
-   -- Compare_Files --
-   -------------------
-
-   procedure Compare_Files (Left, Right : String) is
-      Left_File, Right_File : File_Type;
-   begin
-      Open (Left_File, In_File, Left);
-      Open (Right_File, In_File, Right);
-      Compare_Streams (Stream (Left_File).all, Stream (Right_File).all);
-      Close (Left_File);
-      Close (Right_File);
-   end Compare_Files;
-
-   ---------------------
-   -- Compare_Streams --
-   ---------------------
-
-   procedure Compare_Streams
-     (Left, Right : in out Ada.Streams.Root_Stream_Type'Class)
-   is
-      Left_Buffer, Right_Buffer : Stream_Element_Array (0 .. 16#FFF#);
-      Left_Last, Right_Last : Stream_Element_Offset;
-   begin
-      loop
-         Read (Left, Left_Buffer, Left_Last);
-         Read (Right, Right_Buffer, Right_Last);
-
-         if Left_Last /= Right_Last then
-            Ada.Text_IO.Put_Line ("Compare error :"
-              & Stream_Element_Offset'Image (Left_Last)
-              & " /= "
-              & Stream_Element_Offset'Image (Right_Last));
-
-            raise Constraint_Error;
-
-         elsif Left_Buffer (0 .. Left_Last)
-               /= Right_Buffer (0 .. Right_Last)
-         then
-            Ada.Text_IO.Put_Line ("ERROR: IN and OUT files is not equal.");
-            raise Constraint_Error;
-
-         end if;
-
-         exit when Left_Last < Left_Buffer'Last;
-      end loop;
-   end Compare_Streams;
-
-   ------------------
-   -- Copy_Streams --
-   ------------------
-
-   procedure Copy_Streams
-     (Source, Target : in out Ada.Streams.Root_Stream_Type'Class;
-      Buffer_Size    : in     Stream_Element_Offset := 1024)
-   is
-      Buffer : Stream_Element_Array (1 .. Buffer_Size);
-      Last   : Stream_Element_Offset;
-   begin
-      loop
-         Read  (Source, Buffer, Last);
-         Write (Target, Buffer (1 .. Last));
-
-         exit when Last < Buffer'Last;
-      end loop;
-   end Copy_Streams;
-
-   -------------
-   -- Data_In --
-   -------------
-
-   procedure Data_In
-     (Item : out Stream_Element_Array;
-      Last : out Stream_Element_Offset) is
-   begin
-      Read (File_In, Item, Last);
-   end Data_In;
-
-   --------------
-   -- Data_Out --
-   --------------
-
-   procedure Data_Out (Item : in Stream_Element_Array) is
-   begin
-      Write (File_Out, Item);
-   end Data_Out;
-
-   -------------------
-   -- Generate_File --
-   -------------------
-
-   procedure Generate_File is
-      subtype Visible_Symbols is Stream_Element range 16#20# .. 16#7E#;
-
-      package Random_Elements is
-         new Ada.Numerics.Discrete_Random (Visible_Symbols);
-
-      Gen    : Random_Elements.Generator;
-      Buffer : Stream_Element_Array := (1 .. 77 => 16#20#) & 10;
-
-      Buffer_Count : constant Count := File_Size / Buffer'Length;
-      --  Number of same buffers in the packet.
-
-      Density : constant Count := 30; --  from 0 to Buffer'Length - 2;
-
-      procedure Fill_Buffer (J, D : in Count);
-      --  Change the part of the buffer.
-
-      -----------------
-      -- Fill_Buffer --
-      -----------------
-
-      procedure Fill_Buffer (J, D : in Count) is
-      begin
-         for K in 0 .. D loop
-            Buffer
-              (Stream_Element_Offset ((J + K) mod (Buffer'Length - 1) + 1))
-             := Random_Elements.Random (Gen);
-
-         end loop;
-      end Fill_Buffer;
-
-   begin
-      Random_Elements.Reset (Gen, Init_Random);
-
-      Create (File_In, Out_File, In_File_Name);
-
-      Fill_Buffer (1, Buffer'Length - 2);
-
-      for J in 1 .. Buffer_Count loop
-         Write (File_In, Buffer);
-
-         Fill_Buffer (J, Density);
-      end loop;
-
-      --  fill remain size.
-
-      Write
-        (File_In,
-         Buffer
-           (1 .. Stream_Element_Offset
-                   (File_Size - Buffer'Length * Buffer_Count)));
-
-      Flush (File_In);
-      Close (File_In);
-   end Generate_File;
-
-   ---------------------
-   -- Print_Statistic --
-   ---------------------
-
-   procedure Print_Statistic (Msg : String; Data_Size : ZLib.Count) is
-      use Ada.Calendar;
-      use Ada.Text_IO;
-
-      package Count_IO is new Integer_IO (ZLib.Count);
-
-      Curr_Dur : Duration := Clock - Time_Stamp;
-   begin
-      Put (Msg);
-
-      Set_Col (20);
-      Ada.Text_IO.Put ("size =");
-
-      Count_IO.Put
-        (Data_Size,
-         Width => Stream_IO.Count'Image (File_Size)'Length);
-
-      Put_Line (" duration =" & Duration'Image (Curr_Dur));
-   end Print_Statistic;
-
-   -----------
-   -- Stamp --
-   -----------
-
-   procedure Stamp is
-   begin
-      Time_Stamp := Ada.Calendar.Clock;
-   end Stamp;
-
-begin
-   Ada.Text_IO.Put_Line ("ZLib " & ZLib.Version);
-
-   loop
-      Generate_File;
-
-      for Level in ZLib.Compression_Level'Range loop
-
-         Ada.Text_IO.Put_Line ("Level ="
-            & ZLib.Compression_Level'Image (Level));
-
-         --  Test generic interface.
-         Open   (File_In, In_File, In_File_Name);
-         Create (File_Out, Out_File, Z_File_Name);
-
-         Stamp;
-
-         --  Deflate using generic instantiation.
-
-         ZLib.Deflate_Init
-               (Filter   => Filter,
-                Level    => Level,
-                Strategy => Strategy,
-                Header   => Header);
-
-         Translate (Filter);
-         Print_Statistic ("Generic compress", ZLib.Total_Out (Filter));
-         ZLib.Close (Filter);
-
-         Close (File_In);
-         Close (File_Out);
-
-         Open   (File_In, In_File, Z_File_Name);
-         Create (File_Out, Out_File, Out_File_Name);
-
-         Stamp;
-
-         --  Inflate using generic instantiation.
-
-         ZLib.Inflate_Init (Filter, Header => Header);
-
-         Translate (Filter);
-         Print_Statistic ("Generic decompress", ZLib.Total_Out (Filter));
-
-         ZLib.Close (Filter);
-
-         Close (File_In);
-         Close (File_Out);
-
-         Compare_Files (In_File_Name, Out_File_Name);
-
-         --  Test stream interface.
-
-         --  Compress to the back stream.
-
-         Open   (File_In, In_File, In_File_Name);
-         Create (File_Back, Out_File, Z_File_Name);
-
-         Stamp;
-
-         ZLib.Streams.Create
-           (Stream          => File_Z,
-            Mode            => ZLib.Streams.Out_Stream,
-            Back            => ZLib.Streams.Stream_Access
-                                 (Stream (File_Back)),
-            Back_Compressed => True,
-            Level           => Level,
-            Strategy        => Strategy,
-            Header          => Header);
-
-         Copy_Streams
-           (Source => Stream (File_In).all,
-            Target => File_Z);
-
-         --  Flushing internal buffers to the back stream.
-
-         ZLib.Streams.Flush (File_Z, ZLib.Finish);
-
-         Print_Statistic ("Write compress",
-                          ZLib.Streams.Write_Total_Out (File_Z));
-
-         ZLib.Streams.Close (File_Z);
-
-         Close (File_In);
-         Close (File_Back);
-
-         --  Compare reading from original file and from
-         --  decompression stream.
-
-         Open (File_In,   In_File, In_File_Name);
-         Open (File_Back, In_File, Z_File_Name);
-
-         ZLib.Streams.Create
-           (Stream          => File_Z,
-            Mode            => ZLib.Streams.In_Stream,
-            Back            => ZLib.Streams.Stream_Access
-                                 (Stream (File_Back)),
-            Back_Compressed => True,
-            Header          => Header);
-
-         Stamp;
-         Compare_Streams (Stream (File_In).all, File_Z);
-
-         Print_Statistic ("Read decompress",
-                          ZLib.Streams.Read_Total_Out (File_Z));
-
-         ZLib.Streams.Close (File_Z);
-         Close (File_In);
-         Close (File_Back);
-
-         --  Compress by reading from compression stream.
-
-         Open (File_Back, In_File, In_File_Name);
-         Create (File_Out, Out_File, Z_File_Name);
-
-         ZLib.Streams.Create
-           (Stream          => File_Z,
-            Mode            => ZLib.Streams.In_Stream,
-            Back            => ZLib.Streams.Stream_Access
-                                 (Stream (File_Back)),
-            Back_Compressed => False,
-            Level           => Level,
-            Strategy        => Strategy,
-            Header          => Header);
-
-         Stamp;
-         Copy_Streams
-           (Source => File_Z,
-            Target => Stream (File_Out).all);
-
-         Print_Statistic ("Read compress",
-                          ZLib.Streams.Read_Total_Out (File_Z));
-
-         ZLib.Streams.Close (File_Z);
-
-         Close (File_Out);
-         Close (File_Back);
-
-         --  Decompress to decompression stream.
-
-         Open   (File_In,   In_File, Z_File_Name);
-         Create (File_Back, Out_File, Out_File_Name);
-
-         ZLib.Streams.Create
-           (Stream          => File_Z,
-            Mode            => ZLib.Streams.Out_Stream,
-            Back            => ZLib.Streams.Stream_Access
-                                 (Stream (File_Back)),
-            Back_Compressed => False,
-            Header          => Header);
-
-         Stamp;
-
-         Copy_Streams
-           (Source => Stream (File_In).all,
-            Target => File_Z);
-
-         Print_Statistic ("Write decompress",
-                          ZLib.Streams.Write_Total_Out (File_Z));
-
-         ZLib.Streams.Close (File_Z);
-         Close (File_In);
-         Close (File_Back);
-
-         Compare_Files (In_File_Name, Out_File_Name);
-      end loop;
-
-      Ada.Text_IO.Put_Line (Count'Image (File_Size) & " Ok.");
-
-      exit when not Continuous;
-
-      File_Size := File_Size + 1;
-   end loop;
-end Test;
diff --git a/src/png/zlib/contrib/ada/zlib-streams.adb b/src/png/zlib/contrib/ada/zlib-streams.adb
deleted file mode 100644
index b6497bae2..000000000
--- a/src/png/zlib/contrib/ada/zlib-streams.adb
+++ /dev/null
@@ -1,225 +0,0 @@
-----------------------------------------------------------------
---  ZLib for Ada thick binding.                               --
---                                                            --
---  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
---                                                            --
---  Open source license information is in the zlib.ads file.  --
-----------------------------------------------------------------
-
---  $Id: zlib-streams.adb,v 1.10 2004/05/31 10:53:40 vagul Exp $
-
-with Ada.Unchecked_Deallocation;
-
-package body ZLib.Streams is
-
-   -----------
-   -- Close --
-   -----------
-
-   procedure Close (Stream : in out Stream_Type) is
-      procedure Free is new Ada.Unchecked_Deallocation
-         (Stream_Element_Array, Buffer_Access);
-   begin
-      if Stream.Mode = Out_Stream or Stream.Mode = Duplex then
-         --  We should flush the data written by the writer.
-
-         Flush (Stream, Finish);
-
-         Close (Stream.Writer);
-      end if;
-
-      if Stream.Mode = In_Stream or Stream.Mode = Duplex then
-         Close (Stream.Reader);
-         Free (Stream.Buffer);
-      end if;
-   end Close;
-
-   ------------
-   -- Create --
-   ------------
-
-   procedure Create
-     (Stream            :    out Stream_Type;
-      Mode              : in     Stream_Mode;
-      Back              : in     Stream_Access;
-      Back_Compressed   : in     Boolean;
-      Level             : in     Compression_Level := Default_Compression;
-      Strategy          : in     Strategy_Type     := Default_Strategy;
-      Header            : in     Header_Type       := Default;
-      Read_Buffer_Size  : in     Ada.Streams.Stream_Element_Offset
-                                    := Default_Buffer_Size;
-      Write_Buffer_Size : in     Ada.Streams.Stream_Element_Offset
-                                    := Default_Buffer_Size)
-   is
-
-      subtype Buffer_Subtype is Stream_Element_Array (1 .. Read_Buffer_Size);
-
-      procedure Init_Filter
-         (Filter   : in out Filter_Type;
-          Compress : in     Boolean);
-
-      -----------------
-      -- Init_Filter --
-      -----------------
-
-      procedure Init_Filter
-         (Filter   : in out Filter_Type;
-          Compress : in     Boolean) is
-      begin
-         if Compress then
-            Deflate_Init
-              (Filter, Level, Strategy, Header => Header);
-         else
-            Inflate_Init (Filter, Header => Header);
-         end if;
-      end Init_Filter;
-
-   begin
-      Stream.Back := Back;
-      Stream.Mode := Mode;
-
-      if Mode = Out_Stream or Mode = Duplex then
-         Init_Filter (Stream.Writer, Back_Compressed);
-         Stream.Buffer_Size := Write_Buffer_Size;
-      else
-         Stream.Buffer_Size := 0;
-      end if;
-
-      if Mode = In_Stream or Mode = Duplex then
-         Init_Filter (Stream.Reader, not Back_Compressed);
-
-         Stream.Buffer     := new Buffer_Subtype;
-         Stream.Rest_First := Stream.Buffer'Last + 1;
-         Stream.Rest_Last  := Stream.Buffer'Last;
-      end if;
-   end Create;
-
-   -----------
-   -- Flush --
-   -----------
-
-   procedure Flush
-     (Stream : in out Stream_Type;
-      Mode   : in     Flush_Mode := Sync_Flush)
-   is
-      Buffer : Stream_Element_Array (1 .. Stream.Buffer_Size);
-      Last   : Stream_Element_Offset;
-   begin
-      loop
-         Flush (Stream.Writer, Buffer, Last, Mode);
-
-         Ada.Streams.Write (Stream.Back.all, Buffer (1 .. Last));
-
-         exit when Last < Buffer'Last;
-      end loop;
-   end Flush;
-
-   -------------
-   -- Is_Open --
-   -------------
-
-   function Is_Open (Stream : Stream_Type) return Boolean is
-   begin
-      return Is_Open (Stream.Reader) or else Is_Open (Stream.Writer);
-   end Is_Open;
-
-   ----------
-   -- Read --
-   ----------
-
-   procedure Read
-     (Stream : in out Stream_Type;
-      Item   :    out Stream_Element_Array;
-      Last   :    out Stream_Element_Offset)
-   is
-
-      procedure Read
-        (Item : out Stream_Element_Array;
-         Last : out Stream_Element_Offset);
-
-      ----------
-      -- Read --
-      ----------
-
-      procedure Read
-        (Item : out Stream_Element_Array;
-         Last : out Stream_Element_Offset) is
-      begin
-         Ada.Streams.Read (Stream.Back.all, Item, Last);
-      end Read;
-
-      procedure Read is new ZLib.Read
-         (Read       => Read,
-          Buffer     => Stream.Buffer.all,
-          Rest_First => Stream.Rest_First,
-          Rest_Last  => Stream.Rest_Last);
-
-   begin
-      Read (Stream.Reader, Item, Last);
-   end Read;
-
-   -------------------
-   -- Read_Total_In --
-   -------------------
-
-   function Read_Total_In (Stream : in Stream_Type) return Count is
-   begin
-      return Total_In (Stream.Reader);
-   end Read_Total_In;
-
-   --------------------
-   -- Read_Total_Out --
-   --------------------
-
-   function Read_Total_Out (Stream : in Stream_Type) return Count is
-   begin
-      return Total_Out (Stream.Reader);
-   end Read_Total_Out;
-
-   -----------
-   -- Write --
-   -----------
-
-   procedure Write
-     (Stream : in out Stream_Type;
-      Item   : in     Stream_Element_Array)
-   is
-
-      procedure Write (Item : in Stream_Element_Array);
-
-      -----------
-      -- Write --
-      -----------
-
-      procedure Write (Item : in Stream_Element_Array) is
-      begin
-         Ada.Streams.Write (Stream.Back.all, Item);
-      end Write;
-
-      procedure Write is new ZLib.Write
-         (Write       => Write,
-          Buffer_Size => Stream.Buffer_Size);
-
-   begin
-      Write (Stream.Writer, Item, No_Flush);
-   end Write;
-
-   --------------------
-   -- Write_Total_In --
-   --------------------
-
-   function Write_Total_In (Stream : in Stream_Type) return Count is
-   begin
-      return Total_In (Stream.Writer);
-   end Write_Total_In;
-
-   ---------------------
-   -- Write_Total_Out --
-   ---------------------
-
-   function Write_Total_Out (Stream : in Stream_Type) return Count is
-   begin
-      return Total_Out (Stream.Writer);
-   end Write_Total_Out;
-
-end ZLib.Streams;
diff --git a/src/png/zlib/contrib/ada/zlib-streams.ads b/src/png/zlib/contrib/ada/zlib-streams.ads
deleted file mode 100644
index 8e26cd450..000000000
--- a/src/png/zlib/contrib/ada/zlib-streams.ads
+++ /dev/null
@@ -1,114 +0,0 @@
-----------------------------------------------------------------
---  ZLib for Ada thick binding.                               --
---                                                            --
---  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
---                                                            --
---  Open source license information is in the zlib.ads file.  --
-----------------------------------------------------------------
-
---  $Id: zlib-streams.ads,v 1.12 2004/05/31 10:53:40 vagul Exp $
-
-package ZLib.Streams is
-
-   type Stream_Mode is (In_Stream, Out_Stream, Duplex);
-
-   type Stream_Access is access all Ada.Streams.Root_Stream_Type'Class;
-
-   type Stream_Type is
-      new Ada.Streams.Root_Stream_Type with private;
-
-   procedure Read
-     (Stream : in out Stream_Type;
-      Item   :    out Ada.Streams.Stream_Element_Array;
-      Last   :    out Ada.Streams.Stream_Element_Offset);
-
-   procedure Write
-     (Stream : in out Stream_Type;
-      Item   : in     Ada.Streams.Stream_Element_Array);
-
-   procedure Flush
-     (Stream : in out Stream_Type;
-      Mode   : in     Flush_Mode := Sync_Flush);
-   --  Flush the written data to the back stream,
-   --  all data placed to the compressor is flushing to the Back stream.
-   --  Should not be used until necessary, because it is decreasing
-   --  compression.
-
-   function Read_Total_In (Stream : in Stream_Type) return Count;
-   pragma Inline (Read_Total_In);
-   --  Return total number of bytes read from back stream so far.
-
-   function Read_Total_Out (Stream : in Stream_Type) return Count;
-   pragma Inline (Read_Total_Out);
-   --  Return total number of bytes read so far.
-
-   function Write_Total_In (Stream : in Stream_Type) return Count;
-   pragma Inline (Write_Total_In);
-   --  Return total number of bytes written so far.
-
-   function Write_Total_Out (Stream : in Stream_Type) return Count;
-   pragma Inline (Write_Total_Out);
-   --  Return total number of bytes written to the back stream.
-
-   procedure Create
-     (Stream            :    out Stream_Type;
-      Mode              : in     Stream_Mode;
-      Back              : in     Stream_Access;
-      Back_Compressed   : in     Boolean;
-      Level             : in     Compression_Level := Default_Compression;
-      Strategy          : in     Strategy_Type     := Default_Strategy;
-      Header            : in     Header_Type       := Default;
-      Read_Buffer_Size  : in     Ada.Streams.Stream_Element_Offset
-                                    := Default_Buffer_Size;
-      Write_Buffer_Size : in     Ada.Streams.Stream_Element_Offset
-                                    := Default_Buffer_Size);
-   --  Create the Comression/Decompression stream.
-   --  If mode is In_Stream then Write operation is disabled.
-   --  If mode is Out_Stream then Read operation is disabled.
-
-   --  If Back_Compressed is true then
-   --  Data written to the Stream is compressing to the Back stream
-   --  and data read from the Stream is decompressed data from the Back stream.
-
-   --  If Back_Compressed is false then
-   --  Data written to the Stream is decompressing to the Back stream
-   --  and data read from the Stream is compressed data from the Back stream.
-
-   --  !!! When the Need_Header is False ZLib-Ada is using undocumented
-   --  ZLib 1.1.4 functionality to do not create/wait for ZLib headers.
-
-   function Is_Open (Stream : Stream_Type) return Boolean;
-
-   procedure Close (Stream : in out Stream_Type);
-
-private
-
-   use Ada.Streams;
-
-   type Buffer_Access is access all Stream_Element_Array;
-
-   type Stream_Type
-     is new Root_Stream_Type with
-   record
-      Mode       : Stream_Mode;
-
-      Buffer     : Buffer_Access;
-      Rest_First : Stream_Element_Offset;
-      Rest_Last  : Stream_Element_Offset;
-      --  Buffer for Read operation.
-      --  We need to have this buffer in the record
-      --  because not all read data from back stream
-      --  could be processed during the read operation.
-
-      Buffer_Size : Stream_Element_Offset;
-      --  Buffer size for write operation.
-      --  We do not need to have this buffer
-      --  in the record because all data could be
-      --  processed in the write operation.
-
-      Back       : Stream_Access;
-      Reader     : Filter_Type;
-      Writer     : Filter_Type;
-   end record;
-
-end ZLib.Streams;
diff --git a/src/png/zlib/contrib/ada/zlib-thin.adb b/src/png/zlib/contrib/ada/zlib-thin.adb
deleted file mode 100644
index 0ca4a7120..000000000
--- a/src/png/zlib/contrib/ada/zlib-thin.adb
+++ /dev/null
@@ -1,141 +0,0 @@
-----------------------------------------------------------------
---  ZLib for Ada thick binding.                               --
---                                                            --
---  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
---                                                            --
---  Open source license information is in the zlib.ads file.  --
-----------------------------------------------------------------
-
---  $Id: zlib-thin.adb,v 1.8 2003/12/14 18:27:31 vagul Exp $
-
-package body ZLib.Thin is
-
-   ZLIB_VERSION  : constant Chars_Ptr := zlibVersion;
-
-   Z_Stream_Size : constant Int := Z_Stream'Size / System.Storage_Unit;
-
-   --------------
-   -- Avail_In --
-   --------------
-
-   function Avail_In (Strm : in Z_Stream) return UInt is
-   begin
-      return Strm.Avail_In;
-   end Avail_In;
-
-   ---------------
-   -- Avail_Out --
-   ---------------
-
-   function Avail_Out (Strm : in Z_Stream) return UInt is
-   begin
-      return Strm.Avail_Out;
-   end Avail_Out;
-
-   ------------------
-   -- Deflate_Init --
-   ------------------
-
-   function Deflate_Init
-     (strm       : Z_Streamp;
-      level      : Int;
-      method     : Int;
-      windowBits : Int;
-      memLevel   : Int;
-      strategy   : Int)
-      return       Int is
-   begin
-      return deflateInit2
-               (strm,
-                level,
-                method,
-                windowBits,
-                memLevel,
-                strategy,
-                ZLIB_VERSION,
-                Z_Stream_Size);
-   end Deflate_Init;
-
-   ------------------
-   -- Inflate_Init --
-   ------------------
-
-   function Inflate_Init (strm : Z_Streamp; windowBits : Int) return Int is
-   begin
-      return inflateInit2 (strm, windowBits, ZLIB_VERSION, Z_Stream_Size);
-   end Inflate_Init;
-
-   ------------------------
-   -- Last_Error_Message --
-   ------------------------
-
-   function Last_Error_Message (Strm : in Z_Stream) return String is
-      use Interfaces.C.Strings;
-   begin
-      if Strm.msg = Null_Ptr then
-         return "";
-      else
-         return Value (Strm.msg);
-      end if;
-   end Last_Error_Message;
-
-   ------------
-   -- Set_In --
-   ------------
-
-   procedure Set_In
-     (Strm   : in out Z_Stream;
-      Buffer : in     Voidp;
-      Size   : in     UInt) is
-   begin
-      Strm.Next_In  := Buffer;
-      Strm.Avail_In := Size;
-   end Set_In;
-
-   ------------------
-   -- Set_Mem_Func --
-   ------------------
-
-   procedure Set_Mem_Func
-     (Strm   : in out Z_Stream;
-      Opaque : in     Voidp;
-      Alloc  : in     alloc_func;
-      Free   : in     free_func) is
-   begin
-      Strm.opaque := Opaque;
-      Strm.zalloc := Alloc;
-      Strm.zfree  := Free;
-   end Set_Mem_Func;
-
-   -------------
-   -- Set_Out --
-   -------------
-
-   procedure Set_Out
-     (Strm   : in out Z_Stream;
-      Buffer : in     Voidp;
-      Size   : in     UInt) is
-   begin
-      Strm.Next_Out  := Buffer;
-      Strm.Avail_Out := Size;
-   end Set_Out;
-
-   --------------
-   -- Total_In --
-   --------------
-
-   function Total_In (Strm : in Z_Stream) return ULong is
-   begin
-      return Strm.Total_In;
-   end Total_In;
-
-   ---------------
-   -- Total_Out --
-   ---------------
-
-   function Total_Out (Strm : in Z_Stream) return ULong is
-   begin
-      return Strm.Total_Out;
-   end Total_Out;
-
-end ZLib.Thin;
diff --git a/src/png/zlib/contrib/ada/zlib-thin.ads b/src/png/zlib/contrib/ada/zlib-thin.ads
deleted file mode 100644
index 810173cff..000000000
--- a/src/png/zlib/contrib/ada/zlib-thin.ads
+++ /dev/null
@@ -1,450 +0,0 @@
-----------------------------------------------------------------
---  ZLib for Ada thick binding.                               --
---                                                            --
---  Copyright (C) 2002-2003 Dmitriy Anisimkov                 --
---                                                            --
---  Open source license information is in the zlib.ads file.  --
-----------------------------------------------------------------
-
---  $Id: zlib-thin.ads,v 1.11 2004/07/23 06:33:11 vagul Exp $
-
-with Interfaces.C.Strings;
-
-with System;
-
-private package ZLib.Thin is
-
-   --  From zconf.h
-
-   MAX_MEM_LEVEL : constant := 9;         --  zconf.h:105
-                                          --  zconf.h:105
-   MAX_WBITS : constant := 15;      --  zconf.h:115
-                                    --  32K LZ77 window
-                                    --  zconf.h:115
-   SEEK_SET : constant := 8#0000#;  --  zconf.h:244
-                                    --  Seek from beginning of file.
-                                    --  zconf.h:244
-   SEEK_CUR : constant := 1;        --  zconf.h:245
-                                    --  Seek from current position.
-                                    --  zconf.h:245
-   SEEK_END : constant := 2;        --  zconf.h:246
-                                    --  Set file pointer to EOF plus "offset"
-                                    --  zconf.h:246
-
-   type Byte is new Interfaces.C.unsigned_char; --  8 bits
-                                                --  zconf.h:214
-   type UInt is new Interfaces.C.unsigned;      --  16 bits or more
-                                                --  zconf.h:216
-   type Int is new Interfaces.C.int;
-
-   type ULong is new Interfaces.C.unsigned_long;     --  32 bits or more
-                                                     --  zconf.h:217
-   subtype Chars_Ptr is Interfaces.C.Strings.chars_ptr;
-
-   type ULong_Access is access ULong;
-   type Int_Access is access Int;
-
-   subtype Voidp is System.Address;            --  zconf.h:232
-
-   subtype Byte_Access is Voidp;
-
-   Nul : constant Voidp := System.Null_Address;
-   --  end from zconf
-
-   Z_NO_FLUSH : constant := 8#0000#;   --  zlib.h:125
-                                       --  zlib.h:125
-   Z_PARTIAL_FLUSH : constant := 1;       --  zlib.h:126
-                                          --  will be removed, use
-                                          --  Z_SYNC_FLUSH instead
-                                          --  zlib.h:126
-   Z_SYNC_FLUSH : constant := 2;       --  zlib.h:127
-                                       --  zlib.h:127
-   Z_FULL_FLUSH : constant := 3;       --  zlib.h:128
-                                       --  zlib.h:128
-   Z_FINISH : constant := 4;        --  zlib.h:129
-                                    --  zlib.h:129
-   Z_OK : constant := 8#0000#;   --  zlib.h:132
-                                 --  zlib.h:132
-   Z_STREAM_END : constant := 1;       --  zlib.h:133
-                                       --  zlib.h:133
-   Z_NEED_DICT : constant := 2;        --  zlib.h:134
-                                       --  zlib.h:134
-   Z_ERRNO : constant := -1;        --  zlib.h:135
-                                    --  zlib.h:135
-   Z_STREAM_ERROR : constant := -2;       --  zlib.h:136
-                                          --  zlib.h:136
-   Z_DATA_ERROR : constant := -3;      --  zlib.h:137
-                                       --  zlib.h:137
-   Z_MEM_ERROR : constant := -4;       --  zlib.h:138
-                                       --  zlib.h:138
-   Z_BUF_ERROR : constant := -5;       --  zlib.h:139
-                                       --  zlib.h:139
-   Z_VERSION_ERROR : constant := -6;      --  zlib.h:140
-                                          --  zlib.h:140
-   Z_NO_COMPRESSION : constant := 8#0000#;   --  zlib.h:145
-                                             --  zlib.h:145
-   Z_BEST_SPEED : constant := 1;       --  zlib.h:146
-                                       --  zlib.h:146
-   Z_BEST_COMPRESSION : constant := 9;       --  zlib.h:147
-                                             --  zlib.h:147
-   Z_DEFAULT_COMPRESSION : constant := -1;      --  zlib.h:148
-                                                --  zlib.h:148
-   Z_FILTERED : constant := 1;      --  zlib.h:151
-                                    --  zlib.h:151
-   Z_HUFFMAN_ONLY : constant := 2;        --  zlib.h:152
-                                          --  zlib.h:152
-   Z_DEFAULT_STRATEGY : constant := 8#0000#; --  zlib.h:153
-                                             --  zlib.h:153
-   Z_BINARY : constant := 8#0000#;  --  zlib.h:156
-                                    --  zlib.h:156
-   Z_ASCII : constant := 1;      --  zlib.h:157
-                                 --  zlib.h:157
-   Z_UNKNOWN : constant := 2;       --  zlib.h:158
-                                    --  zlib.h:158
-   Z_DEFLATED : constant := 8;      --  zlib.h:161
-                                    --  zlib.h:161
-   Z_NULL : constant := 8#0000#; --  zlib.h:164
-                                 --  for initializing zalloc, zfree, opaque
-                                 --  zlib.h:164
-   type gzFile is new Voidp;                  --  zlib.h:646
-
-   type Z_Stream is private;
-
-   type Z_Streamp is access all Z_Stream;     --  zlib.h:89
-
-   type alloc_func is access function
-     (Opaque : Voidp;
-      Items  : UInt;
-      Size   : UInt)
-      return Voidp; --  zlib.h:63
-
-   type free_func is access procedure (opaque : Voidp; address : Voidp);
-
-   function zlibVersion return Chars_Ptr;
-
-   function Deflate (strm : Z_Streamp; flush : Int) return Int;
-
-   function DeflateEnd (strm : Z_Streamp) return Int;
-
-   function Inflate (strm : Z_Streamp; flush : Int) return Int;
-
-   function InflateEnd (strm : Z_Streamp) return Int;
-
-   function deflateSetDictionary
-     (strm       : Z_Streamp;
-      dictionary : Byte_Access;
-      dictLength : UInt)
-      return       Int;
-
-   function deflateCopy (dest : Z_Streamp; source : Z_Streamp) return Int;
-   --  zlib.h:478
-
-   function deflateReset (strm : Z_Streamp) return Int; -- zlib.h:495
-
-   function deflateParams
-     (strm     : Z_Streamp;
-      level    : Int;
-      strategy : Int)
-      return     Int;       -- zlib.h:506
-
-   function inflateSetDictionary
-     (strm       : Z_Streamp;
-      dictionary : Byte_Access;
-      dictLength : UInt)
-      return       Int; --  zlib.h:548
-
-   function inflateSync (strm : Z_Streamp) return Int;  --  zlib.h:565
-
-   function inflateReset (strm : Z_Streamp) return Int; --  zlib.h:580
-
-   function compress
-     (dest      : Byte_Access;
-      destLen   : ULong_Access;
-      source    : Byte_Access;
-      sourceLen : ULong)
-      return      Int;           -- zlib.h:601
-
-   function compress2
-     (dest      : Byte_Access;
-      destLen   : ULong_Access;
-      source    : Byte_Access;
-      sourceLen : ULong;
-      level     : Int)
-      return      Int;          -- zlib.h:615
-
-   function uncompress
-     (dest      : Byte_Access;
-      destLen   : ULong_Access;
-      source    : Byte_Access;
-      sourceLen : ULong)
-      return      Int;
-
-   function gzopen (path : Chars_Ptr; mode : Chars_Ptr) return gzFile;
-
-   function gzdopen (fd : Int; mode : Chars_Ptr) return gzFile;
-
-   function gzsetparams
-     (file     : gzFile;
-      level    : Int;
-      strategy : Int)
-      return     Int;
-
-   function gzread
-     (file : gzFile;
-      buf  : Voidp;
-      len  : UInt)
-      return Int;
-
-   function gzwrite
-     (file : in gzFile;
-      buf  : in Voidp;
-      len  : in UInt)
-      return Int;
-
-   function gzprintf (file : in gzFile; format : in Chars_Ptr) return Int;
-
-   function gzputs (file : in gzFile; s : in Chars_Ptr) return Int;
-
-   function gzgets
-     (file : gzFile;
-      buf  : Chars_Ptr;
-      len  : Int)
-      return Chars_Ptr;
-
-   function gzputc (file : gzFile; char : Int) return Int;
-
-   function gzgetc (file : gzFile) return Int;
-
-   function gzflush (file : gzFile; flush : Int) return Int;
-
-   function gzseek
-     (file   : gzFile;
-      offset : Int;
-      whence : Int)
-      return   Int;
-
-   function gzrewind (file : gzFile) return Int;
-
-   function gztell (file : gzFile) return Int;
-
-   function gzeof (file : gzFile) return Int;
-
-   function gzclose (file : gzFile) return Int;
-
-   function gzerror (file : gzFile; errnum : Int_Access) return Chars_Ptr;
-
-   function adler32
-     (adler : ULong;
-      buf   : Byte_Access;
-      len   : UInt)
-      return  ULong;
-
-   function crc32
-     (crc  : ULong;
-      buf  : Byte_Access;
-      len  : UInt)
-      return ULong;
-
-   function deflateInit
-     (strm        : Z_Streamp;
-      level       : Int;
-      version     : Chars_Ptr;
-      stream_size : Int)
-      return        Int;
-
-   function deflateInit2
-     (strm        : Z_Streamp;
-      level       : Int;
-      method      : Int;
-      windowBits  : Int;
-      memLevel    : Int;
-      strategy    : Int;
-      version     : Chars_Ptr;
-      stream_size : Int)
-      return        Int;
-
-   function Deflate_Init
-     (strm       : Z_Streamp;
-      level      : Int;
-      method     : Int;
-      windowBits : Int;
-      memLevel   : Int;
-      strategy   : Int)
-      return       Int;
-   pragma Inline (Deflate_Init);
-
-   function inflateInit
-     (strm        : Z_Streamp;
-      version     : Chars_Ptr;
-      stream_size : Int)
-      return        Int;
-
-   function inflateInit2
-     (strm        : in Z_Streamp;
-      windowBits  : in Int;
-      version     : in Chars_Ptr;
-      stream_size : in Int)
-      return      Int;
-
-   function inflateBackInit
-     (strm        : in Z_Streamp;
-      windowBits  : in Int;
-      window      : in Byte_Access;
-      version     : in Chars_Ptr;
-      stream_size : in Int)
-      return      Int;
-   --  Size of window have to be 2**windowBits.
-
-   function Inflate_Init (strm : Z_Streamp; windowBits : Int) return Int;
-   pragma Inline (Inflate_Init);
-
-   function zError (err : Int) return Chars_Ptr;
-
-   function inflateSyncPoint (z : Z_Streamp) return Int;
-
-   function get_crc_table return ULong_Access;
-
-   --  Interface to the available fields of the z_stream structure.
-   --  The application must update next_in and avail_in when avail_in has
-   --  dropped to zero. It must update next_out and avail_out when avail_out
-   --  has dropped to zero. The application must initialize zalloc, zfree and
-   --  opaque before calling the init function.
-
-   procedure Set_In
-     (Strm   : in out Z_Stream;
-      Buffer : in Voidp;
-      Size   : in UInt);
-   pragma Inline (Set_In);
-
-   procedure Set_Out
-     (Strm   : in out Z_Stream;
-      Buffer : in Voidp;
-      Size   : in UInt);
-   pragma Inline (Set_Out);
-
-   procedure Set_Mem_Func
-     (Strm   : in out Z_Stream;
-      Opaque : in Voidp;
-      Alloc  : in alloc_func;
-      Free   : in free_func);
-   pragma Inline (Set_Mem_Func);
-
-   function Last_Error_Message (Strm : in Z_Stream) return String;
-   pragma Inline (Last_Error_Message);
-
-   function Avail_Out (Strm : in Z_Stream) return UInt;
-   pragma Inline (Avail_Out);
-
-   function Avail_In (Strm : in Z_Stream) return UInt;
-   pragma Inline (Avail_In);
-
-   function Total_In (Strm : in Z_Stream) return ULong;
-   pragma Inline (Total_In);
-
-   function Total_Out (Strm : in Z_Stream) return ULong;
-   pragma Inline (Total_Out);
-
-   function inflateCopy
-     (dest   : in Z_Streamp;
-      Source : in Z_Streamp)
-      return Int;
-
-   function compressBound (Source_Len : in ULong) return ULong;
-
-   function deflateBound
-     (Strm       : in Z_Streamp;
-      Source_Len : in ULong)
-      return     ULong;
-
-   function gzungetc (C : in Int; File : in  gzFile) return Int;
-
-   function zlibCompileFlags return ULong;
-
-private
-
-   type Z_Stream is record            -- zlib.h:68
-      Next_In   : Voidp      := Nul;  -- next input byte
-      Avail_In  : UInt       := 0;    -- number of bytes available at next_in
-      Total_In  : ULong      := 0;    -- total nb of input bytes read so far
-      Next_Out  : Voidp      := Nul;  -- next output byte should be put there
-      Avail_Out : UInt       := 0;    -- remaining free space at next_out
-      Total_Out : ULong      := 0;    -- total nb of bytes output so far
-      msg       : Chars_Ptr;          -- last error message, NULL if no error
-      state     : Voidp;              -- not visible by applications
-      zalloc    : alloc_func := null; -- used to allocate the internal state
-      zfree     : free_func  := null; -- used to free the internal state
-      opaque    : Voidp;              -- private data object passed to
-                                      --  zalloc and zfree
-      data_type : Int;                -- best guess about the data type:
-                                      --  ascii or binary
-      adler     : ULong;              -- adler32 value of the uncompressed
-                                      --  data
-      reserved  : ULong;              -- reserved for future use
-   end record;
-
-   pragma Convention (C, Z_Stream);
-
-   pragma Import (C, zlibVersion, "zlibVersion");
-   pragma Import (C, Deflate, "deflate");
-   pragma Import (C, DeflateEnd, "deflateEnd");
-   pragma Import (C, Inflate, "inflate");
-   pragma Import (C, InflateEnd, "inflateEnd");
-   pragma Import (C, deflateSetDictionary, "deflateSetDictionary");
-   pragma Import (C, deflateCopy, "deflateCopy");
-   pragma Import (C, deflateReset, "deflateReset");
-   pragma Import (C, deflateParams, "deflateParams");
-   pragma Import (C, inflateSetDictionary, "inflateSetDictionary");
-   pragma Import (C, inflateSync, "inflateSync");
-   pragma Import (C, inflateReset, "inflateReset");
-   pragma Import (C, compress, "compress");
-   pragma Import (C, compress2, "compress2");
-   pragma Import (C, uncompress, "uncompress");
-   pragma Import (C, gzopen, "gzopen");
-   pragma Import (C, gzdopen, "gzdopen");
-   pragma Import (C, gzsetparams, "gzsetparams");
-   pragma Import (C, gzread, "gzread");
-   pragma Import (C, gzwrite, "gzwrite");
-   pragma Import (C, gzprintf, "gzprintf");
-   pragma Import (C, gzputs, "gzputs");
-   pragma Import (C, gzgets, "gzgets");
-   pragma Import (C, gzputc, "gzputc");
-   pragma Import (C, gzgetc, "gzgetc");
-   pragma Import (C, gzflush, "gzflush");
-   pragma Import (C, gzseek, "gzseek");
-   pragma Import (C, gzrewind, "gzrewind");
-   pragma Import (C, gztell, "gztell");
-   pragma Import (C, gzeof, "gzeof");
-   pragma Import (C, gzclose, "gzclose");
-   pragma Import (C, gzerror, "gzerror");
-   pragma Import (C, adler32, "adler32");
-   pragma Import (C, crc32, "crc32");
-   pragma Import (C, deflateInit, "deflateInit_");
-   pragma Import (C, inflateInit, "inflateInit_");
-   pragma Import (C, deflateInit2, "deflateInit2_");
-   pragma Import (C, inflateInit2, "inflateInit2_");
-   pragma Import (C, zError, "zError");
-   pragma Import (C, inflateSyncPoint, "inflateSyncPoint");
-   pragma Import (C, get_crc_table, "get_crc_table");
-
-   --  since zlib 1.2.0:
-
-   pragma Import (C, inflateCopy, "inflateCopy");
-   pragma Import (C, compressBound, "compressBound");
-   pragma Import (C, deflateBound, "deflateBound");
-   pragma Import (C, gzungetc, "gzungetc");
-   pragma Import (C, zlibCompileFlags, "zlibCompileFlags");
-
-   pragma Import (C, inflateBackInit, "inflateBackInit_");
-
-   --  I stopped binding the inflateBack routines, because realize that
-   --  it does not support zlib and gzip headers for now, and have no
-   --  symmetric deflateBack routines.
-   --  ZLib-Ada is symmetric regarding deflate/inflate data transformation
-   --  and has a similar generic callback interface for the
-   --  deflate/inflate transformation based on the regular Deflate/Inflate
-   --  routines.
-
-   --  pragma Import (C, inflateBack, "inflateBack");
-   --  pragma Import (C, inflateBackEnd, "inflateBackEnd");
-
-end ZLib.Thin;
diff --git a/src/png/zlib/contrib/ada/zlib.adb b/src/png/zlib/contrib/ada/zlib.adb
deleted file mode 100644
index 8b6fd686a..000000000
--- a/src/png/zlib/contrib/ada/zlib.adb
+++ /dev/null
@@ -1,701 +0,0 @@
-----------------------------------------------------------------
---  ZLib for Ada thick binding.                               --
---                                                            --
---  Copyright (C) 2002-2004 Dmitriy Anisimkov                 --
---                                                            --
---  Open source license information is in the zlib.ads file.  --
-----------------------------------------------------------------
-
---  $Id: zlib.adb,v 1.31 2004/09/06 06:53:19 vagul Exp $
-
-with Ada.Exceptions;
-with Ada.Unchecked_Conversion;
-with Ada.Unchecked_Deallocation;
-
-with Interfaces.C.Strings;
-
-with ZLib.Thin;
-
-package body ZLib is
-
-   use type Thin.Int;
-
-   type Z_Stream is new Thin.Z_Stream;
-
-   type Return_Code_Enum is
-      (OK,
-       STREAM_END,
-       NEED_DICT,
-       ERRNO,
-       STREAM_ERROR,
-       DATA_ERROR,
-       MEM_ERROR,
-       BUF_ERROR,
-       VERSION_ERROR);
-
-   type Flate_Step_Function is access
-     function (Strm : in Thin.Z_Streamp; Flush : in Thin.Int) return Thin.Int;
-   pragma Convention (C, Flate_Step_Function);
-
-   type Flate_End_Function is access
-      function (Ctrm : in Thin.Z_Streamp) return Thin.Int;
-   pragma Convention (C, Flate_End_Function);
-
-   type Flate_Type is record
-      Step : Flate_Step_Function;
-      Done : Flate_End_Function;
-   end record;
-
-   subtype Footer_Array is Stream_Element_Array (1 .. 8);
-
-   Simple_GZip_Header : constant Stream_Element_Array (1 .. 10)
-     := (16#1f#, 16#8b#,                 --  Magic header
-         16#08#,                         --  Z_DEFLATED
-         16#00#,                         --  Flags
-         16#00#, 16#00#, 16#00#, 16#00#, --  Time
-         16#00#,                         --  XFlags
-         16#03#                          --  OS code
-        );
-   --  The simplest gzip header is not for informational, but just for
-   --  gzip format compatibility.
-   --  Note that some code below is using assumption
-   --  Simple_GZip_Header'Last > Footer_Array'Last, so do not make
-   --  Simple_GZip_Header'Last <= Footer_Array'Last.
-
-   Return_Code : constant array (Thin.Int range <>) of Return_Code_Enum
-     := (0 => OK,
-         1 => STREAM_END,
-         2 => NEED_DICT,
-        -1 => ERRNO,
-        -2 => STREAM_ERROR,
-        -3 => DATA_ERROR,
-        -4 => MEM_ERROR,
-        -5 => BUF_ERROR,
-        -6 => VERSION_ERROR);
-
-   Flate : constant array (Boolean) of Flate_Type
-     := (True  => (Step => Thin.Deflate'Access,
-                   Done => Thin.DeflateEnd'Access),
-         False => (Step => Thin.Inflate'Access,
-                   Done => Thin.InflateEnd'Access));
-
-   Flush_Finish : constant array (Boolean) of Flush_Mode
-     := (True => Finish, False => No_Flush);
-
-   procedure Raise_Error (Stream : in Z_Stream);
-   pragma Inline (Raise_Error);
-
-   procedure Raise_Error (Message : in String);
-   pragma Inline (Raise_Error);
-
-   procedure Check_Error (Stream : in Z_Stream; Code : in Thin.Int);
-
-   procedure Free is new Ada.Unchecked_Deallocation
-      (Z_Stream, Z_Stream_Access);
-
-   function To_Thin_Access is new Ada.Unchecked_Conversion
-     (Z_Stream_Access, Thin.Z_Streamp);
-
-   procedure Translate_GZip
-     (Filter    : in out Filter_Type;
-      In_Data   : in     Ada.Streams.Stream_Element_Array;
-      In_Last   :    out Ada.Streams.Stream_Element_Offset;
-      Out_Data  :    out Ada.Streams.Stream_Element_Array;
-      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
-      Flush     : in     Flush_Mode);
-   --  Separate translate routine for make gzip header.
-
-   procedure Translate_Auto
-     (Filter    : in out Filter_Type;
-      In_Data   : in     Ada.Streams.Stream_Element_Array;
-      In_Last   :    out Ada.Streams.Stream_Element_Offset;
-      Out_Data  :    out Ada.Streams.Stream_Element_Array;
-      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
-      Flush     : in     Flush_Mode);
-   --  translate routine without additional headers.
-
-   -----------------
-   -- Check_Error --
-   -----------------
-
-   procedure Check_Error (Stream : in Z_Stream; Code : in Thin.Int) is
-      use type Thin.Int;
-   begin
-      if Code /= Thin.Z_OK then
-         Raise_Error
-            (Return_Code_Enum'Image (Return_Code (Code))
-              & ": " & Last_Error_Message (Stream));
-      end if;
-   end Check_Error;
-
-   -----------
-   -- Close --
-   -----------
-
-   procedure Close
-     (Filter       : in out Filter_Type;
-      Ignore_Error : in     Boolean := False)
-   is
-      Code : Thin.Int;
-   begin
-      if not Ignore_Error and then not Is_Open (Filter) then
-         raise Status_Error;
-      end if;
-
-      Code := Flate (Filter.Compression).Done (To_Thin_Access (Filter.Strm));
-
-      if Ignore_Error or else Code = Thin.Z_OK then
-         Free (Filter.Strm);
-      else
-         declare
-            Error_Message : constant String
-              := Last_Error_Message (Filter.Strm.all);
-         begin
-            Free (Filter.Strm);
-            Ada.Exceptions.Raise_Exception
-               (ZLib_Error'Identity,
-                Return_Code_Enum'Image (Return_Code (Code))
-                  & ": " & Error_Message);
-         end;
-      end if;
-   end Close;
-
-   -----------
-   -- CRC32 --
-   -----------
-
-   function CRC32
-     (CRC  : in Unsigned_32;
-      Data : in Ada.Streams.Stream_Element_Array)
-      return Unsigned_32
-   is
-      use Thin;
-   begin
-      return Unsigned_32 (crc32 (ULong (CRC),
-                                 Data'Address,
-                                 Data'Length));
-   end CRC32;
-
-   procedure CRC32
-     (CRC  : in out Unsigned_32;
-      Data : in     Ada.Streams.Stream_Element_Array) is
-   begin
-      CRC := CRC32 (CRC, Data);
-   end CRC32;
-
-   ------------------
-   -- Deflate_Init --
-   ------------------
-
-   procedure Deflate_Init
-     (Filter       : in out Filter_Type;
-      Level        : in     Compression_Level  := Default_Compression;
-      Strategy     : in     Strategy_Type      := Default_Strategy;
-      Method       : in     Compression_Method := Deflated;
-      Window_Bits  : in     Window_Bits_Type   := Default_Window_Bits;
-      Memory_Level : in     Memory_Level_Type  := Default_Memory_Level;
-      Header       : in     Header_Type        := Default)
-   is
-      use type Thin.Int;
-      Win_Bits : Thin.Int := Thin.Int (Window_Bits);
-   begin
-      if Is_Open (Filter) then
-         raise Status_Error;
-      end if;
-
-      --  We allow ZLib to make header only in case of default header type.
-      --  Otherwise we would either do header by ourselfs, or do not do
-      --  header at all.
-
-      if Header = None or else Header = GZip then
-         Win_Bits := -Win_Bits;
-      end if;
-
-      --  For the GZip CRC calculation and make headers.
-
-      if Header = GZip then
-         Filter.CRC    := 0;
-         Filter.Offset := Simple_GZip_Header'First;
-      else
-         Filter.Offset := Simple_GZip_Header'Last + 1;
-      end if;
-
-      Filter.Strm        := new Z_Stream;
-      Filter.Compression := True;
-      Filter.Stream_End  := False;
-      Filter.Header      := Header;
-
-      if Thin.Deflate_Init
-           (To_Thin_Access (Filter.Strm),
-            Level      => Thin.Int (Level),
-            method     => Thin.Int (Method),
-            windowBits => Win_Bits,
-            memLevel   => Thin.Int (Memory_Level),
-            strategy   => Thin.Int (Strategy)) /= Thin.Z_OK
-      then
-         Raise_Error (Filter.Strm.all);
-      end if;
-   end Deflate_Init;
-
-   -----------
-   -- Flush --
-   -----------
-
-   procedure Flush
-     (Filter    : in out Filter_Type;
-      Out_Data  :    out Ada.Streams.Stream_Element_Array;
-      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
-      Flush     : in     Flush_Mode)
-   is
-      No_Data : Stream_Element_Array := (1 .. 0 => 0);
-      Last    : Stream_Element_Offset;
-   begin
-      Translate (Filter, No_Data, Last, Out_Data, Out_Last, Flush);
-   end Flush;
-
-   -----------------------
-   -- Generic_Translate --
-   -----------------------
-
-   procedure Generic_Translate
-     (Filter          : in out ZLib.Filter_Type;
-      In_Buffer_Size  : in     Integer := Default_Buffer_Size;
-      Out_Buffer_Size : in     Integer := Default_Buffer_Size)
-   is
-      In_Buffer  : Stream_Element_Array
-                     (1 .. Stream_Element_Offset (In_Buffer_Size));
-      Out_Buffer : Stream_Element_Array
-                     (1 .. Stream_Element_Offset (Out_Buffer_Size));
-      Last       : Stream_Element_Offset;
-      In_Last    : Stream_Element_Offset;
-      In_First   : Stream_Element_Offset;
-      Out_Last   : Stream_Element_Offset;
-   begin
-      Main : loop
-         Data_In (In_Buffer, Last);
-
-         In_First := In_Buffer'First;
-
-         loop
-            Translate
-              (Filter   => Filter,
-               In_Data  => In_Buffer (In_First .. Last),
-               In_Last  => In_Last,
-               Out_Data => Out_Buffer,
-               Out_Last => Out_Last,
-               Flush    => Flush_Finish (Last < In_Buffer'First));
-
-            if Out_Buffer'First <= Out_Last then
-               Data_Out (Out_Buffer (Out_Buffer'First .. Out_Last));
-            end if;
-
-            exit Main when Stream_End (Filter);
-
-            --  The end of in buffer.
-
-            exit when In_Last = Last;
-
-            In_First := In_Last + 1;
-         end loop;
-      end loop Main;
-
-   end Generic_Translate;
-
-   ------------------
-   -- Inflate_Init --
-   ------------------
-
-   procedure Inflate_Init
-     (Filter      : in out Filter_Type;
-      Window_Bits : in     Window_Bits_Type := Default_Window_Bits;
-      Header      : in     Header_Type      := Default)
-   is
-      use type Thin.Int;
-      Win_Bits : Thin.Int := Thin.Int (Window_Bits);
-
-      procedure Check_Version;
-      --  Check the latest header types compatibility.
-
-      procedure Check_Version is
-      begin
-         if Version <= "1.1.4" then
-            Raise_Error
-              ("Inflate header type " & Header_Type'Image (Header)
-               & " incompatible with ZLib version " & Version);
-         end if;
-      end Check_Version;
-
-   begin
-      if Is_Open (Filter) then
-         raise Status_Error;
-      end if;
-
-      case Header is
-         when None =>
-            Check_Version;
-
-            --  Inflate data without headers determined
-            --  by negative Win_Bits.
-
-            Win_Bits := -Win_Bits;
-         when GZip =>
-            Check_Version;
-
-            --  Inflate gzip data defined by flag 16.
-
-            Win_Bits := Win_Bits + 16;
-         when Auto =>
-            Check_Version;
-
-            --  Inflate with automatic detection
-            --  of gzip or native header defined by flag 32.
-
-            Win_Bits := Win_Bits + 32;
-         when Default => null;
-      end case;
-
-      Filter.Strm        := new Z_Stream;
-      Filter.Compression := False;
-      Filter.Stream_End  := False;
-      Filter.Header      := Header;
-
-      if Thin.Inflate_Init
-         (To_Thin_Access (Filter.Strm), Win_Bits) /= Thin.Z_OK
-      then
-         Raise_Error (Filter.Strm.all);
-      end if;
-   end Inflate_Init;
-
-   -------------
-   -- Is_Open --
-   -------------
-
-   function Is_Open (Filter : in Filter_Type) return Boolean is
-   begin
-      return Filter.Strm /= null;
-   end Is_Open;
-
-   -----------------
-   -- Raise_Error --
-   -----------------
-
-   procedure Raise_Error (Message : in String) is
-   begin
-      Ada.Exceptions.Raise_Exception (ZLib_Error'Identity, Message);
-   end Raise_Error;
-
-   procedure Raise_Error (Stream : in Z_Stream) is
-   begin
-      Raise_Error (Last_Error_Message (Stream));
-   end Raise_Error;
-
-   ----------
-   -- Read --
-   ----------
-
-   procedure Read
-     (Filter : in out Filter_Type;
-      Item   :    out Ada.Streams.Stream_Element_Array;
-      Last   :    out Ada.Streams.Stream_Element_Offset;
-      Flush  : in     Flush_Mode := No_Flush)
-   is
-      In_Last    : Stream_Element_Offset;
-      Item_First : Ada.Streams.Stream_Element_Offset := Item'First;
-      V_Flush    : Flush_Mode := Flush;
-
-   begin
-      pragma Assert (Rest_First in Buffer'First .. Buffer'Last + 1);
-      pragma Assert (Rest_Last in Buffer'First - 1 .. Buffer'Last);
-
-      loop
-         if Rest_Last = Buffer'First - 1 then
-            V_Flush := Finish;
-
-         elsif Rest_First > Rest_Last then
-            Read (Buffer, Rest_Last);
-            Rest_First := Buffer'First;
-
-            if Rest_Last < Buffer'First then
-               V_Flush := Finish;
-            end if;
-         end if;
-
-         Translate
-           (Filter   => Filter,
-            In_Data  => Buffer (Rest_First .. Rest_Last),
-            In_Last  => In_Last,
-            Out_Data => Item (Item_First .. Item'Last),
-            Out_Last => Last,
-            Flush    => V_Flush);
-
-         Rest_First := In_Last + 1;
-
-         exit when Stream_End (Filter)
-           or else Last = Item'Last
-           or else (Last >= Item'First and then Allow_Read_Some);
-
-         Item_First := Last + 1;
-      end loop;
-   end Read;
-
-   ----------------
-   -- Stream_End --
-   ----------------
-
-   function Stream_End (Filter : in Filter_Type) return Boolean is
-   begin
-      if Filter.Header = GZip and Filter.Compression then
-         return Filter.Stream_End
-            and then Filter.Offset = Footer_Array'Last + 1;
-      else
-         return Filter.Stream_End;
-      end if;
-   end Stream_End;
-
-   --------------
-   -- Total_In --
-   --------------
-
-   function Total_In (Filter : in Filter_Type) return Count is
-   begin
-      return Count (Thin.Total_In (To_Thin_Access (Filter.Strm).all));
-   end Total_In;
-
-   ---------------
-   -- Total_Out --
-   ---------------
-
-   function Total_Out (Filter : in Filter_Type) return Count is
-   begin
-      return Count (Thin.Total_Out (To_Thin_Access (Filter.Strm).all));
-   end Total_Out;
-
-   ---------------
-   -- Translate --
-   ---------------
-
-   procedure Translate
-     (Filter    : in out Filter_Type;
-      In_Data   : in     Ada.Streams.Stream_Element_Array;
-      In_Last   :    out Ada.Streams.Stream_Element_Offset;
-      Out_Data  :    out Ada.Streams.Stream_Element_Array;
-      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
-      Flush     : in     Flush_Mode) is
-   begin
-      if Filter.Header = GZip and then Filter.Compression then
-         Translate_GZip
-           (Filter   => Filter,
-            In_Data  => In_Data,
-            In_Last  => In_Last,
-            Out_Data => Out_Data,
-            Out_Last => Out_Last,
-            Flush    => Flush);
-      else
-         Translate_Auto
-           (Filter   => Filter,
-            In_Data  => In_Data,
-            In_Last  => In_Last,
-            Out_Data => Out_Data,
-            Out_Last => Out_Last,
-            Flush    => Flush);
-      end if;
-   end Translate;
-
-   --------------------
-   -- Translate_Auto --
-   --------------------
-
-   procedure Translate_Auto
-     (Filter    : in out Filter_Type;
-      In_Data   : in     Ada.Streams.Stream_Element_Array;
-      In_Last   :    out Ada.Streams.Stream_Element_Offset;
-      Out_Data  :    out Ada.Streams.Stream_Element_Array;
-      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
-      Flush     : in     Flush_Mode)
-   is
-      use type Thin.Int;
-      Code : Thin.Int;
-
-   begin
-      if not Is_Open (Filter) then
-         raise Status_Error;
-      end if;
-
-      if Out_Data'Length = 0 and then In_Data'Length = 0 then
-         raise Constraint_Error;
-      end if;
-
-      Set_Out (Filter.Strm.all, Out_Data'Address, Out_Data'Length);
-      Set_In  (Filter.Strm.all, In_Data'Address, In_Data'Length);
-
-      Code := Flate (Filter.Compression).Step
-        (To_Thin_Access (Filter.Strm),
-         Thin.Int (Flush));
-
-      if Code = Thin.Z_STREAM_END then
-         Filter.Stream_End := True;
-      else
-         Check_Error (Filter.Strm.all, Code);
-      end if;
-
-      In_Last  := In_Data'Last
-         - Stream_Element_Offset (Avail_In (Filter.Strm.all));
-      Out_Last := Out_Data'Last
-         - Stream_Element_Offset (Avail_Out (Filter.Strm.all));
-   end Translate_Auto;
-
-   --------------------
-   -- Translate_GZip --
-   --------------------
-
-   procedure Translate_GZip
-     (Filter    : in out Filter_Type;
-      In_Data   : in     Ada.Streams.Stream_Element_Array;
-      In_Last   :    out Ada.Streams.Stream_Element_Offset;
-      Out_Data  :    out Ada.Streams.Stream_Element_Array;
-      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
-      Flush     : in     Flush_Mode)
-   is
-      Out_First : Stream_Element_Offset;
-
-      procedure Add_Data (Data : in Stream_Element_Array);
-      --  Add data to stream from the Filter.Offset till necessary,
-      --  used for add gzip headr/footer.
-
-      procedure Put_32
-        (Item : in out Stream_Element_Array;
-         Data : in     Unsigned_32);
-      pragma Inline (Put_32);
-
-      --------------
-      -- Add_Data --
-      --------------
-
-      procedure Add_Data (Data : in Stream_Element_Array) is
-         Data_First : Stream_Element_Offset renames Filter.Offset;
-         Data_Last  : Stream_Element_Offset;
-         Data_Len   : Stream_Element_Offset; --  -1
-         Out_Len    : Stream_Element_Offset; --  -1
-      begin
-         Out_First := Out_Last + 1;
-
-         if Data_First > Data'Last then
-            return;
-         end if;
-
-         Data_Len  := Data'Last     - Data_First;
-         Out_Len   := Out_Data'Last - Out_First;
-
-         if Data_Len <= Out_Len then
-            Out_Last  := Out_First  + Data_Len;
-            Data_Last := Data'Last;
-         else
-            Out_Last  := Out_Data'Last;
-            Data_Last := Data_First + Out_Len;
-         end if;
-
-         Out_Data (Out_First .. Out_Last) := Data (Data_First .. Data_Last);
-
-         Data_First := Data_Last + 1;
-         Out_First  := Out_Last + 1;
-      end Add_Data;
-
-      ------------
-      -- Put_32 --
-      ------------
-
-      procedure Put_32
-        (Item : in out Stream_Element_Array;
-         Data : in     Unsigned_32)
-      is
-         D : Unsigned_32 := Data;
-      begin
-         for J in Item'First .. Item'First + 3 loop
-            Item (J) := Stream_Element (D and 16#FF#);
-            D := Shift_Right (D, 8);
-         end loop;
-      end Put_32;
-
-   begin
-      Out_Last := Out_Data'First - 1;
-
-      if not Filter.Stream_End then
-         Add_Data (Simple_GZip_Header);
-
-         Translate_Auto
-           (Filter   => Filter,
-            In_Data  => In_Data,
-            In_Last  => In_Last,
-            Out_Data => Out_Data (Out_First .. Out_Data'Last),
-            Out_Last => Out_Last,
-            Flush    => Flush);
-
-         CRC32 (Filter.CRC, In_Data (In_Data'First .. In_Last));
-      end if;
-
-      if Filter.Stream_End and then Out_Last <= Out_Data'Last then
-         --  This detection method would work only when
-         --  Simple_GZip_Header'Last > Footer_Array'Last
-
-         if Filter.Offset = Simple_GZip_Header'Last + 1 then
-            Filter.Offset := Footer_Array'First;
-         end if;
-
-         declare
-            Footer : Footer_Array;
-         begin
-            Put_32 (Footer, Filter.CRC);
-            Put_32 (Footer (Footer'First + 4 .. Footer'Last),
-                    Unsigned_32 (Total_In (Filter)));
-            Add_Data (Footer);
-         end;
-      end if;
-   end Translate_GZip;
-
-   -------------
-   -- Version --
-   -------------
-
-   function Version return String is
-   begin
-      return Interfaces.C.Strings.Value (Thin.zlibVersion);
-   end Version;
-
-   -----------
-   -- Write --
-   -----------
-
-   procedure Write
-     (Filter : in out Filter_Type;
-      Item   : in     Ada.Streams.Stream_Element_Array;
-      Flush  : in     Flush_Mode := No_Flush)
-   is
-      Buffer   : Stream_Element_Array (1 .. Buffer_Size);
-      In_Last  : Stream_Element_Offset;
-      Out_Last : Stream_Element_Offset;
-      In_First : Stream_Element_Offset := Item'First;
-   begin
-      if Item'Length = 0 and Flush = No_Flush then
-         return;
-      end if;
-
-      loop
-         Translate
-           (Filter   => Filter,
-            In_Data  => Item (In_First .. Item'Last),
-            In_Last  => In_Last,
-            Out_Data => Buffer,
-            Out_Last => Out_Last,
-            Flush    => Flush);
-
-         if Out_Last >= Buffer'First then
-            Write (Buffer (1 .. Out_Last));
-         end if;
-
-         exit when In_Last = Item'Last or Stream_End (Filter);
-
-         In_First := In_Last + 1;
-      end loop;
-   end Write;
-
-end ZLib;
diff --git a/src/png/zlib/contrib/ada/zlib.ads b/src/png/zlib/contrib/ada/zlib.ads
deleted file mode 100644
index 79ffc4095..000000000
--- a/src/png/zlib/contrib/ada/zlib.ads
+++ /dev/null
@@ -1,328 +0,0 @@
-------------------------------------------------------------------------------
---                      ZLib for Ada thick binding.                         --
---                                                                          --
---              Copyright (C) 2002-2004 Dmitriy Anisimkov                   --
---                                                                          --
---  This library is free software; you can redistribute it and/or modify    --
---  it under the terms of the GNU General Public License as published by    --
---  the Free Software Foundation; either version 2 of the License, or (at   --
---  your option) any later version.                                         --
---                                                                          --
---  This library is distributed in the hope that it will be useful, but     --
---  WITHOUT ANY WARRANTY; without even the implied warranty of              --
---  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       --
---  General Public License for more details.                                --
---                                                                          --
---  You should have received a copy of the GNU General Public License       --
---  along with this library; if not, write to the Free Software Foundation, --
---  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.          --
---                                                                          --
---  As a special exception, if other files instantiate generics from this   --
---  unit, or you link this unit with other files to produce an executable,  --
---  this  unit  does not  by itself cause  the resulting executable to be   --
---  covered by the GNU General Public License. This exception does not      --
---  however invalidate any other reasons why the executable file  might be  --
---  covered by the  GNU Public License.                                     --
-------------------------------------------------------------------------------
-
---  $Id: zlib.ads,v 1.26 2004/09/06 06:53:19 vagul Exp $
-
-with Ada.Streams;
-
-with Interfaces;
-
-package ZLib is
-
-   ZLib_Error   : exception;
-   Status_Error : exception;
-
-   type Compression_Level is new Integer range -1 .. 9;
-
-   type Flush_Mode is private;
-
-   type Compression_Method is private;
-
-   type Window_Bits_Type is new Integer range 8 .. 15;
-
-   type Memory_Level_Type is new Integer range 1 .. 9;
-
-   type Unsigned_32 is new Interfaces.Unsigned_32;
-
-   type Strategy_Type is private;
-
-   type Header_Type is (None, Auto, Default, GZip);
-   --  Header type usage have a some limitation for inflate.
-   --  See comment for Inflate_Init.
-
-   subtype Count is Ada.Streams.Stream_Element_Count;
-
-   Default_Memory_Level : constant Memory_Level_Type := 8;
-   Default_Window_Bits  : constant Window_Bits_Type  := 15;
-
-   ----------------------------------
-   -- Compression method constants --
-   ----------------------------------
-
-   Deflated : constant Compression_Method;
-   --  Only one method allowed in this ZLib version
-
-   ---------------------------------
-   -- Compression level constants --
-   ---------------------------------
-
-   No_Compression      : constant Compression_Level := 0;
-   Best_Speed          : constant Compression_Level := 1;
-   Best_Compression    : constant Compression_Level := 9;
-   Default_Compression : constant Compression_Level := -1;
-
-   --------------------------
-   -- Flush mode constants --
-   --------------------------
-
-   No_Flush      : constant Flush_Mode;
-   --  Regular way for compression, no flush
-
-   Partial_Flush : constant Flush_Mode;
-   --  Will be removed, use Z_SYNC_FLUSH instead
-
-   Sync_Flush    : constant Flush_Mode;
-   --  All pending output is flushed to the output buffer and the output
-   --  is aligned on a byte boundary, so that the decompressor can get all
-   --  input data available so far. (In particular avail_in is zero after the
-   --  call if enough output space has been provided  before the call.)
-   --  Flushing may degrade compression for some compression algorithms and so
-   --  it should be used only when necessary.
-
-   Block_Flush   : constant Flush_Mode;
-   --  Z_BLOCK requests that inflate() stop
-   --  if and when it get to the next deflate block boundary. When decoding the
-   --  zlib or gzip format, this will cause inflate() to return immediately
-   --  after the header and before the first block. When doing a raw inflate,
-   --  inflate() will go ahead and process the first block, and will return
-   --  when it gets to the end of that block, or when it runs out of data.
-
-   Full_Flush    : constant Flush_Mode;
-   --  All output is flushed as with SYNC_FLUSH, and the compression state
-   --  is reset so that decompression can restart from this point if previous
-   --  compressed data has been damaged or if random access is desired. Using
-   --  Full_Flush too often can seriously degrade the compression.
-
-   Finish        : constant Flush_Mode;
-   --  Just for tell the compressor that input data is complete.
-
-   ------------------------------------
-   -- Compression strategy constants --
-   ------------------------------------
-
-   --  RLE stategy could be used only in version 1.2.0 and later.
-
-   Filtered         : constant Strategy_Type;
-   Huffman_Only     : constant Strategy_Type;
-   RLE              : constant Strategy_Type;
-   Default_Strategy : constant Strategy_Type;
-
-   Default_Buffer_Size : constant := 4096;
-
-   type Filter_Type is tagged limited private;
-   --  The filter is for compression and for decompression.
-   --  The usage of the type is depend of its initialization.
-
-   function Version return String;
-   pragma Inline (Version);
-   --  Return string representation of the ZLib version.
-
-   procedure Deflate_Init
-     (Filter       : in out Filter_Type;
-      Level        : in     Compression_Level  := Default_Compression;
-      Strategy     : in     Strategy_Type      := Default_Strategy;
-      Method       : in     Compression_Method := Deflated;
-      Window_Bits  : in     Window_Bits_Type   := Default_Window_Bits;
-      Memory_Level : in     Memory_Level_Type  := Default_Memory_Level;
-      Header       : in     Header_Type        := Default);
-   --  Compressor initialization.
-   --  When Header parameter is Auto or Default, then default zlib header
-   --  would be provided for compressed data.
-   --  When Header is GZip, then gzip header would be set instead of
-   --  default header.
-   --  When Header is None, no header would be set for compressed data.
-
-   procedure Inflate_Init
-     (Filter      : in out Filter_Type;
-      Window_Bits : in     Window_Bits_Type := Default_Window_Bits;
-      Header      : in     Header_Type      := Default);
-   --  Decompressor initialization.
-   --  Default header type mean that ZLib default header is expecting in the
-   --  input compressed stream.
-   --  Header type None mean that no header is expecting in the input stream.
-   --  GZip header type mean that GZip header is expecting in the
-   --  input compressed stream.
-   --  Auto header type mean that header type (GZip or Native) would be
-   --  detected automatically in the input stream.
-   --  Note that header types parameter values None, GZip and Auto are
-   --  supported for inflate routine only in ZLib versions 1.2.0.2 and later.
-   --  Deflate_Init is supporting all header types.
-
-   function Is_Open (Filter : in Filter_Type) return Boolean;
-   pragma Inline (Is_Open);
-   --  Is the filter opened for compression or decompression.
-
-   procedure Close
-     (Filter       : in out Filter_Type;
-      Ignore_Error : in     Boolean := False);
-   --  Closing the compression or decompressor.
-   --  If stream is closing before the complete and Ignore_Error is False,
-   --  The exception would be raised.
-
-   generic
-      with procedure Data_In
-        (Item : out Ada.Streams.Stream_Element_Array;
-         Last : out Ada.Streams.Stream_Element_Offset);
-      with procedure Data_Out
-        (Item : in Ada.Streams.Stream_Element_Array);
-   procedure Generic_Translate
-     (Filter          : in out Filter_Type;
-      In_Buffer_Size  : in     Integer := Default_Buffer_Size;
-      Out_Buffer_Size : in     Integer := Default_Buffer_Size);
-   --  Compress/decompress data fetch from Data_In routine and pass the result
-   --  to the Data_Out routine. User should provide Data_In and Data_Out
-   --  for compression/decompression data flow.
-   --  Compression or decompression depend on Filter initialization.
-
-   function Total_In (Filter : in Filter_Type) return Count;
-   pragma Inline (Total_In);
-   --  Returns total number of input bytes read so far
-
-   function Total_Out (Filter : in Filter_Type) return Count;
-   pragma Inline (Total_Out);
-   --  Returns total number of bytes output so far
-
-   function CRC32
-     (CRC    : in Unsigned_32;
-      Data   : in Ada.Streams.Stream_Element_Array)
-      return Unsigned_32;
-   pragma Inline (CRC32);
-   --  Compute CRC32, it could be necessary for make gzip format
-
-   procedure CRC32
-     (CRC  : in out Unsigned_32;
-      Data : in     Ada.Streams.Stream_Element_Array);
-   pragma Inline (CRC32);
-   --  Compute CRC32, it could be necessary for make gzip format
-
-   -------------------------------------------------
-   --  Below is more complex low level routines.  --
-   -------------------------------------------------
-
-   procedure Translate
-     (Filter    : in out Filter_Type;
-      In_Data   : in     Ada.Streams.Stream_Element_Array;
-      In_Last   :    out Ada.Streams.Stream_Element_Offset;
-      Out_Data  :    out Ada.Streams.Stream_Element_Array;
-      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
-      Flush     : in     Flush_Mode);
-   --  Compress/decompress the In_Data buffer and place the result into
-   --  Out_Data. In_Last is the index of last element from In_Data accepted by
-   --  the Filter. Out_Last is the last element of the received data from
-   --  Filter. To tell the filter that incoming data are complete put the
-   --  Flush parameter to Finish.
-
-   function Stream_End (Filter : in Filter_Type) return Boolean;
-   pragma Inline (Stream_End);
-   --  Return the true when the stream is complete.
-
-   procedure Flush
-     (Filter    : in out Filter_Type;
-      Out_Data  :    out Ada.Streams.Stream_Element_Array;
-      Out_Last  :    out Ada.Streams.Stream_Element_Offset;
-      Flush     : in     Flush_Mode);
-   pragma Inline (Flush);
-   --  Flushing the data from the compressor.
-
-   generic
-      with procedure Write
-        (Item : in Ada.Streams.Stream_Element_Array);
-      --  User should provide this routine for accept
-      --  compressed/decompressed data.
-
-      Buffer_Size : in Ada.Streams.Stream_Element_Offset
-         := Default_Buffer_Size;
-      --  Buffer size for Write user routine.
-
-   procedure Write
-     (Filter  : in out Filter_Type;
-      Item    : in     Ada.Streams.Stream_Element_Array;
-      Flush   : in     Flush_Mode := No_Flush);
-   --  Compress/Decompress data from Item to the generic parameter procedure
-   --  Write. Output buffer size could be set in Buffer_Size generic parameter.
-
-   generic
-      with procedure Read
-        (Item : out Ada.Streams.Stream_Element_Array;
-         Last : out Ada.Streams.Stream_Element_Offset);
-      --  User should provide data for compression/decompression
-      --  thru this routine.
-
-      Buffer : in out Ada.Streams.Stream_Element_Array;
-      --  Buffer for keep remaining data from the previous
-      --  back read.
-
-      Rest_First, Rest_Last : in out Ada.Streams.Stream_Element_Offset;
-      --  Rest_First have to be initialized to Buffer'Last + 1
-      --  Rest_Last have to be initialized to Buffer'Last
-      --  before usage.
-
-      Allow_Read_Some : in Boolean := False;
-      --  Is it allowed to return Last < Item'Last before end of data.
-
-   procedure Read
-     (Filter : in out Filter_Type;
-      Item   :    out Ada.Streams.Stream_Element_Array;
-      Last   :    out Ada.Streams.Stream_Element_Offset;
-      Flush  : in     Flush_Mode := No_Flush);
-   --  Compress/Decompress data from generic parameter procedure Read to the
-   --  Item. User should provide Buffer and initialized Rest_First, Rest_Last
-   --  indicators. If Allow_Read_Some is True, Read routines could return
-   --  Last < Item'Last only at end of stream.
-
-private
-
-   use Ada.Streams;
-
-   pragma Assert (Ada.Streams.Stream_Element'Size    =    8);
-   pragma Assert (Ada.Streams.Stream_Element'Modulus = 2**8);
-
-   type Flush_Mode is new Integer range 0 .. 5;
-
-   type Compression_Method is new Integer range 8 .. 8;
-
-   type Strategy_Type is new Integer range 0 .. 3;
-
-   No_Flush      : constant Flush_Mode := 0;
-   Partial_Flush : constant Flush_Mode := 1;
-   Sync_Flush    : constant Flush_Mode := 2;
-   Full_Flush    : constant Flush_Mode := 3;
-   Finish        : constant Flush_Mode := 4;
-   Block_Flush   : constant Flush_Mode := 5;
-
-   Filtered         : constant Strategy_Type := 1;
-   Huffman_Only     : constant Strategy_Type := 2;
-   RLE              : constant Strategy_Type := 3;
-   Default_Strategy : constant Strategy_Type := 0;
-
-   Deflated : constant Compression_Method := 8;
-
-   type Z_Stream;
-
-   type Z_Stream_Access is access all Z_Stream;
-
-   type Filter_Type is tagged limited record
-      Strm        : Z_Stream_Access;
-      Compression : Boolean;
-      Stream_End  : Boolean;
-      Header      : Header_Type;
-      CRC         : Unsigned_32;
-      Offset      : Stream_Element_Offset;
-      --  Offset for gzip header/footer output.
-   end record;
-
-end ZLib;
diff --git a/src/png/zlib/contrib/ada/zlib.gpr b/src/png/zlib/contrib/ada/zlib.gpr
deleted file mode 100644
index 296b22aa9..000000000
--- a/src/png/zlib/contrib/ada/zlib.gpr
+++ /dev/null
@@ -1,20 +0,0 @@
-project Zlib is
-
-   for Languages use ("Ada");
-   for Source_Dirs use (".");
-   for Object_Dir use ".";
-   for Main use ("test.adb", "mtest.adb", "read.adb", "buffer_demo");
-
-   package Compiler is
-      for Default_Switches ("ada") use ("-gnatwcfilopru", "-gnatVcdfimorst", "-gnatyabcefhiklmnoprst");
-   end Compiler;
-
-   package Linker is
-      for Default_Switches ("ada") use ("-lz");
-   end Linker;
-
-   package Builder is
-      for Default_Switches ("ada") use ("-s", "-gnatQ");
-   end Builder;
-
-end Zlib;
diff --git a/src/png/zlib/contrib/amd64/amd64-match.S b/src/png/zlib/contrib/amd64/amd64-match.S
deleted file mode 100644
index 81d4a1c94..000000000
--- a/src/png/zlib/contrib/amd64/amd64-match.S
+++ /dev/null
@@ -1,452 +0,0 @@
-/*
- * match.S -- optimized version of longest_match()
- * based on the similar work by Gilles Vollant, and Brian Raiter, written 1998
- *
- * This is free software; you can redistribute it and/or modify it
- * under the terms of the BSD License. Use by owners of Che Guevarra
- * parafernalia is prohibited, where possible, and highly discouraged
- * elsewhere.
- */
-
-#ifndef NO_UNDERLINE
-#	define	match_init	_match_init
-#	define	longest_match	_longest_match
-#endif
-
-#define	scanend		ebx
-#define	scanendw	bx
-#define	chainlenwmask	edx /* high word: current chain len low word: s->wmask */
-#define	curmatch	rsi
-#define	curmatchd	esi
-#define	windowbestlen	r8
-#define	scanalign	r9
-#define	scanalignd	r9d
-#define	window		r10
-#define	bestlen		r11
-#define	bestlend	r11d
-#define	scanstart	r12d
-#define	scanstartw	r12w
-#define scan		r13
-#define nicematch	r14d
-#define	limit		r15
-#define	limitd		r15d
-#define prev		rcx
-
-/*
- * The 258 is a "magic number, not a parameter -- changing it
- * breaks the hell loose
- */
-#define	MAX_MATCH	(258)
-#define	MIN_MATCH	(3)
-#define	MIN_LOOKAHEAD	(MAX_MATCH + MIN_MATCH + 1)
-#define	MAX_MATCH_8	((MAX_MATCH + 7) & ~7)
-
-/* stack frame offsets */
-#define	LocalVarsSize	(112)
-#define _chainlenwmask	( 8-LocalVarsSize)(%rsp)
-#define _windowbestlen	(16-LocalVarsSize)(%rsp)
-#define save_r14        (24-LocalVarsSize)(%rsp)
-#define save_rsi        (32-LocalVarsSize)(%rsp)
-#define save_rbx        (40-LocalVarsSize)(%rsp)
-#define save_r12        (56-LocalVarsSize)(%rsp)
-#define save_r13        (64-LocalVarsSize)(%rsp)
-#define save_r15        (80-LocalVarsSize)(%rsp)
-
-
-.globl	match_init, longest_match
-
-/*
- * On AMD64 the first argument of a function (in our case -- the pointer to
- * deflate_state structure) is passed in %rdi, hence our offsets below are
- * all off of that.
- */
-
-/* you can check the structure offset by running
-
-#include <stdlib.h>
-#include <stdio.h>
-#include "deflate.h"
-
-void print_depl()
-{
-deflate_state ds;
-deflate_state *s=&ds;
-printf("size pointer=%u\n",(int)sizeof(void*));
-
-printf("#define dsWSize         (%3u)(%%rdi)\n",(int)(((char*)&(s->w_size))-((char*)s)));
-printf("#define dsWMask         (%3u)(%%rdi)\n",(int)(((char*)&(s->w_mask))-((char*)s)));
-printf("#define dsWindow        (%3u)(%%rdi)\n",(int)(((char*)&(s->window))-((char*)s)));
-printf("#define dsPrev          (%3u)(%%rdi)\n",(int)(((char*)&(s->prev))-((char*)s)));
-printf("#define dsMatchLen      (%3u)(%%rdi)\n",(int)(((char*)&(s->match_length))-((char*)s)));
-printf("#define dsPrevMatch     (%3u)(%%rdi)\n",(int)(((char*)&(s->prev_match))-((char*)s)));
-printf("#define dsStrStart      (%3u)(%%rdi)\n",(int)(((char*)&(s->strstart))-((char*)s)));
-printf("#define dsMatchStart    (%3u)(%%rdi)\n",(int)(((char*)&(s->match_start))-((char*)s)));
-printf("#define dsLookahead     (%3u)(%%rdi)\n",(int)(((char*)&(s->lookahead))-((char*)s)));
-printf("#define dsPrevLen       (%3u)(%%rdi)\n",(int)(((char*)&(s->prev_length))-((char*)s)));
-printf("#define dsMaxChainLen   (%3u)(%%rdi)\n",(int)(((char*)&(s->max_chain_length))-((char*)s)));
-printf("#define dsGoodMatch     (%3u)(%%rdi)\n",(int)(((char*)&(s->good_match))-((char*)s)));
-printf("#define dsNiceMatch     (%3u)(%%rdi)\n",(int)(((char*)&(s->nice_match))-((char*)s)));
-}
-
-*/
-
-
-/*
-  to compile for XCode 3.2 on MacOSX x86_64
-  - run "gcc -g -c -DXCODE_MAC_X64_STRUCTURE amd64-match.S"
- */
-
-
-#ifndef CURRENT_LINX_XCODE_MAC_X64_STRUCTURE
-#define dsWSize		( 68)(%rdi)
-#define dsWMask		( 76)(%rdi)
-#define dsWindow	( 80)(%rdi)
-#define dsPrev		( 96)(%rdi)
-#define dsMatchLen	(144)(%rdi)
-#define dsPrevMatch	(148)(%rdi)
-#define dsStrStart	(156)(%rdi)
-#define dsMatchStart	(160)(%rdi)
-#define dsLookahead	(164)(%rdi)
-#define dsPrevLen	(168)(%rdi)
-#define dsMaxChainLen	(172)(%rdi)
-#define dsGoodMatch	(188)(%rdi)
-#define dsNiceMatch	(192)(%rdi)
-
-#else 
-
-#ifndef STRUCT_OFFSET
-#	define STRUCT_OFFSET	(0)
-#endif
-
-
-#define dsWSize		( 56 + STRUCT_OFFSET)(%rdi)
-#define dsWMask		( 64 + STRUCT_OFFSET)(%rdi)
-#define dsWindow	( 72 + STRUCT_OFFSET)(%rdi)
-#define dsPrev		( 88 + STRUCT_OFFSET)(%rdi)
-#define dsMatchLen	(136 + STRUCT_OFFSET)(%rdi)
-#define dsPrevMatch	(140 + STRUCT_OFFSET)(%rdi)
-#define dsStrStart	(148 + STRUCT_OFFSET)(%rdi)
-#define dsMatchStart	(152 + STRUCT_OFFSET)(%rdi)
-#define dsLookahead	(156 + STRUCT_OFFSET)(%rdi)
-#define dsPrevLen	(160 + STRUCT_OFFSET)(%rdi)
-#define dsMaxChainLen	(164 + STRUCT_OFFSET)(%rdi)
-#define dsGoodMatch	(180 + STRUCT_OFFSET)(%rdi)
-#define dsNiceMatch	(184 + STRUCT_OFFSET)(%rdi)
-
-#endif
-
-
-
-
-.text
-
-/* uInt longest_match(deflate_state *deflatestate, IPos curmatch) */
-
-longest_match:
-/*
- * Retrieve the function arguments. %curmatch will hold cur_match
- * throughout the entire function (passed via rsi on amd64).
- * rdi will hold the pointer to the deflate_state (first arg on amd64)
- */
-		mov     %rsi, save_rsi
-		mov     %rbx, save_rbx
-		mov	%r12, save_r12
-		mov     %r13, save_r13
-		mov     %r14, save_r14
-		mov     %r15, save_r15
-
-/* uInt wmask = s->w_mask;						*/
-/* unsigned chain_length = s->max_chain_length;				*/
-/* if (s->prev_length >= s->good_match) {				*/
-/*     chain_length >>= 2;						*/
-/* }									*/
-
-		movl	dsPrevLen, %eax
-		movl	dsGoodMatch, %ebx
-		cmpl	%ebx, %eax
-		movl	dsWMask, %eax
-		movl	dsMaxChainLen, %chainlenwmask
-		jl	LastMatchGood
-		shrl	$2, %chainlenwmask
-LastMatchGood:
-
-/* chainlen is decremented once beforehand so that the function can	*/
-/* use the sign flag instead of the zero flag for the exit test.	*/
-/* It is then shifted into the high word, to make room for the wmask	*/
-/* value, which it will always accompany.				*/
-
-		decl	%chainlenwmask
-		shll	$16, %chainlenwmask
-		orl	%eax, %chainlenwmask
-
-/* if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;	*/
-
-		movl	dsNiceMatch, %eax
-		movl	dsLookahead, %ebx
-		cmpl	%eax, %ebx
-		jl	LookaheadLess
-		movl	%eax, %ebx
-LookaheadLess:	movl	%ebx, %nicematch
-
-/* register Bytef *scan = s->window + s->strstart;			*/
-
-		mov	dsWindow, %window
-		movl	dsStrStart, %limitd
-		lea	(%limit, %window), %scan
-
-/* Determine how many bytes the scan ptr is off from being		*/
-/* dword-aligned.							*/
-
-		mov	%scan, %scanalign
-		negl	%scanalignd
-		andl	$3, %scanalignd
-
-/* IPos limit = s->strstart > (IPos)MAX_DIST(s) ?			*/
-/*     s->strstart - (IPos)MAX_DIST(s) : NIL;				*/
-
-		movl	dsWSize, %eax
-		subl	$MIN_LOOKAHEAD, %eax
-		xorl	%ecx, %ecx
-		subl	%eax, %limitd
-		cmovng	%ecx, %limitd
-
-/* int best_len = s->prev_length;					*/
-
-		movl	dsPrevLen, %bestlend
-
-/* Store the sum of s->window + best_len in %windowbestlen locally, and in memory.	*/
-
-		lea	(%window, %bestlen), %windowbestlen
-		mov	%windowbestlen, _windowbestlen
-
-/* register ush scan_start = *(ushf*)scan;				*/
-/* register ush scan_end   = *(ushf*)(scan+best_len-1);			*/
-/* Posf *prev = s->prev;						*/
-
-		movzwl	(%scan), %scanstart
-		movzwl	-1(%scan, %bestlen), %scanend
-		mov	dsPrev, %prev
-
-/* Jump into the main loop.						*/
-
-		movl	%chainlenwmask, _chainlenwmask
-		jmp	LoopEntry
-
-.balign 16
-
-/* do {
- *     match = s->window + cur_match;
- *     if (*(ushf*)(match+best_len-1) != scan_end ||
- *         *(ushf*)match != scan_start) continue;
- *     [...]
- * } while ((cur_match = prev[cur_match & wmask]) > limit
- *          && --chain_length != 0);
- *
- * Here is the inner loop of the function. The function will spend the
- * majority of its time in this loop, and majority of that time will
- * be spent in the first ten instructions.
- */
-LookupLoop:
-		andl	%chainlenwmask, %curmatchd
-		movzwl	(%prev, %curmatch, 2), %curmatchd
-		cmpl	%limitd, %curmatchd
-		jbe	LeaveNow
-		subl	$0x00010000, %chainlenwmask
-		js	LeaveNow
-LoopEntry:	cmpw	-1(%windowbestlen, %curmatch), %scanendw
-		jne	LookupLoop
-		cmpw	%scanstartw, (%window, %curmatch)
-		jne	LookupLoop
-
-/* Store the current value of chainlen.					*/
-		movl	%chainlenwmask, _chainlenwmask
-
-/* %scan is the string under scrutiny, and %prev to the string we	*/
-/* are hoping to match it up with. In actuality, %esi and %edi are	*/
-/* both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and %edx is	*/
-/* initialized to -(MAX_MATCH_8 - scanalign).				*/
-
-		mov	$(-MAX_MATCH_8), %rdx
-		lea	(%curmatch, %window), %windowbestlen
-		lea	MAX_MATCH_8(%windowbestlen, %scanalign), %windowbestlen
-		lea	MAX_MATCH_8(%scan, %scanalign), %prev
-
-/* the prefetching below makes very little difference... */
-		prefetcht1	(%windowbestlen, %rdx)
-		prefetcht1	(%prev, %rdx)
-
-/*
- * Test the strings for equality, 8 bytes at a time. At the end,
- * adjust %rdx so that it is offset to the exact byte that mismatched.
- *
- * It should be confessed that this loop usually does not represent
- * much of the total running time. Replacing it with a more
- * straightforward "rep cmpsb" would not drastically degrade
- * performance -- unrolling it, for example, makes no difference.
- */
-
-#undef USE_SSE	/* works, but is 6-7% slower, than non-SSE... */
-
-LoopCmps:
-#ifdef USE_SSE
-		/* Preload the SSE registers */
-		movdqu	  (%windowbestlen, %rdx), %xmm1
-		movdqu	  (%prev, %rdx), %xmm2
-		pcmpeqb	%xmm2, %xmm1
-		movdqu	16(%windowbestlen, %rdx), %xmm3
-		movdqu	16(%prev, %rdx), %xmm4
-		pcmpeqb	%xmm4, %xmm3
-		movdqu	32(%windowbestlen, %rdx), %xmm5
-		movdqu	32(%prev, %rdx), %xmm6
-		pcmpeqb	%xmm6, %xmm5
-		movdqu	48(%windowbestlen, %rdx), %xmm7
-		movdqu	48(%prev, %rdx), %xmm8
-		pcmpeqb	%xmm8, %xmm7
-
-		/* Check the comparisions' results */
-		pmovmskb %xmm1, %rax
-		notw	%ax
-		bsfw	%ax, %ax
-		jnz	LeaveLoopCmps
-		
-		/* this is the only iteration of the loop with a possibility of having
-		   incremented rdx by 0x108 (each loop iteration add 16*4 = 0x40 
-		   and (0x40*4)+8=0x108 */
-		add	$8, %rdx
-		jz LenMaximum
-		add	$8, %rdx
-
-		
-		pmovmskb %xmm3, %rax
-		notw	%ax
-		bsfw	%ax, %ax
-		jnz	LeaveLoopCmps
-		
-		
-		add	$16, %rdx
-
-
-		pmovmskb %xmm5, %rax
-		notw	%ax
-		bsfw	%ax, %ax
-		jnz	LeaveLoopCmps
-		
-		add	$16, %rdx
-
-
-		pmovmskb %xmm7, %rax
-		notw	%ax
-		bsfw	%ax, %ax
-		jnz	LeaveLoopCmps
-		
-		add	$16, %rdx
-		
-		jmp	LoopCmps
-LeaveLoopCmps:	add	%rax, %rdx
-#else
-		mov	(%windowbestlen, %rdx), %rax
-		xor	(%prev, %rdx), %rax
-		jnz	LeaveLoopCmps
-		
-		mov	8(%windowbestlen, %rdx), %rax
-		xor	8(%prev, %rdx), %rax
-		jnz	LeaveLoopCmps8
-
-		mov	16(%windowbestlen, %rdx), %rax
-		xor	16(%prev, %rdx), %rax
-		jnz	LeaveLoopCmps16
-				
-		add	$24, %rdx
-		jnz	LoopCmps
-		jmp	LenMaximum
-#	if 0
-/*
- * This three-liner is tantalizingly simple, but bsf is a slow instruction,
- * and the complicated alternative down below is quite a bit faster. Sad...
- */
-
-LeaveLoopCmps:	bsf	%rax, %rax /* find the first non-zero bit */
-		shrl	$3, %eax /* divide by 8 to get the byte */
-		add	%rax, %rdx
-#	else
-LeaveLoopCmps16:
-		add	$8, %rdx
-LeaveLoopCmps8:
-		add	$8, %rdx
-LeaveLoopCmps:	testl   $0xFFFFFFFF, %eax /* Check the first 4 bytes */
-		jnz     Check16
-		add     $4, %rdx
-		shr     $32, %rax
-Check16:        testw   $0xFFFF, %ax
-		jnz     LenLower
-		add	$2, %rdx
-		shrl	$16, %eax
-LenLower:	subb	$1, %al
-		adc	$0, %rdx
-#	endif
-#endif
-
-/* Calculate the length of the match. If it is longer than MAX_MATCH,	*/
-/* then automatically accept it as the best possible match and leave.	*/
-
-		lea	(%prev, %rdx), %rax
-		sub	%scan, %rax
-		cmpl	$MAX_MATCH, %eax
-		jge	LenMaximum
-
-/* If the length of the match is not longer than the best match we	*/
-/* have so far, then forget it and return to the lookup loop.		*/
-
-		cmpl	%bestlend, %eax
-		jg	LongerMatch
-		mov	_windowbestlen, %windowbestlen
-		mov	dsPrev, %prev
-		movl	_chainlenwmask, %edx
-		jmp	LookupLoop
-
-/*         s->match_start = cur_match;					*/
-/*         best_len = len;						*/
-/*         if (len >= nice_match) break;				*/
-/*         scan_end = *(ushf*)(scan+best_len-1);			*/
-
-LongerMatch:
-		movl	%eax, %bestlend
-		movl	%curmatchd, dsMatchStart
-		cmpl	%nicematch, %eax
-		jge	LeaveNow
-
-		lea	(%window, %bestlen), %windowbestlen
-		mov	%windowbestlen, _windowbestlen
-
-		movzwl	-1(%scan, %rax), %scanend
-		mov	dsPrev, %prev
-		movl	_chainlenwmask, %chainlenwmask
-		jmp	LookupLoop
-
-/* Accept the current string, with the maximum possible length.		*/
-
-LenMaximum:
-		movl	$MAX_MATCH, %bestlend
-		movl	%curmatchd, dsMatchStart
-
-/* if ((uInt)best_len <= s->lookahead) return (uInt)best_len;		*/
-/* return s->lookahead;							*/
-
-LeaveNow:
-		movl	dsLookahead, %eax
-		cmpl	%eax, %bestlend
-		cmovngl	%bestlend, %eax
-LookaheadRet:
-
-/* Restore the registers and return from whence we came.			*/
-
-	mov	save_rsi, %rsi
-	mov	save_rbx, %rbx
-	mov	save_r12, %r12
-	mov	save_r13, %r13
-	mov	save_r14, %r14
-	mov	save_r15, %r15
-
-	ret
-
-match_init:	ret
diff --git a/src/png/zlib/contrib/asm686/README.686 b/src/png/zlib/contrib/asm686/README.686
deleted file mode 100644
index a0bf3bea4..000000000
--- a/src/png/zlib/contrib/asm686/README.686
+++ /dev/null
@@ -1,51 +0,0 @@
-This is a patched version of zlib, modified to use
-Pentium-Pro-optimized assembly code in the deflation algorithm. The
-files changed/added by this patch are:
-
-README.686
-match.S
-
-The speedup that this patch provides varies, depending on whether the
-compiler used to build the original version of zlib falls afoul of the
-PPro's speed traps. My own tests show a speedup of around 10-20% at
-the default compression level, and 20-30% using -9, against a version
-compiled using gcc 2.7.2.3. Your mileage may vary.
-
-Note that this code has been tailored for the PPro/PII in particular,
-and will not perform particuarly well on a Pentium.
-
-If you are using an assembler other than GNU as, you will have to
-translate match.S to use your assembler's syntax. (Have fun.)
-
-Brian Raiter
-breadbox@muppetlabs.com
-April, 1998
-
-
-Added for zlib 1.1.3:
-
-The patches come from
-http://www.muppetlabs.com/~breadbox/software/assembly.html
-
-To compile zlib with this asm file, copy match.S to the zlib directory
-then do:
-
-CFLAGS="-O3 -DASMV" ./configure
-make OBJA=match.o
-
-
-Update:
-
-I've been ignoring these assembly routines for years, believing that
-gcc's generated code had caught up with it sometime around gcc 2.95
-and the major rearchitecting of the Pentium 4. However, I recently
-learned that, despite what I believed, this code still has some life
-in it. On the Pentium 4 and AMD64 chips, it continues to run about 8%
-faster than the code produced by gcc 4.1.
-
-In acknowledgement of its continuing usefulness, I've altered the
-license to match that of the rest of zlib. Share and Enjoy!
-
-Brian Raiter
-breadbox@muppetlabs.com
-April, 2007
diff --git a/src/png/zlib/contrib/asm686/match.S b/src/png/zlib/contrib/asm686/match.S
deleted file mode 100644
index fa4210927..000000000
--- a/src/png/zlib/contrib/asm686/match.S
+++ /dev/null
@@ -1,357 +0,0 @@
-/* match.S -- x86 assembly version of the zlib longest_match() function.
- * Optimized for the Intel 686 chips (PPro and later).
- *
- * Copyright (C) 1998, 2007 Brian Raiter <breadbox@muppetlabs.com>
- *
- * This software is provided 'as-is', without any express or implied
- * warranty.  In no event will the author be held liable for any damages
- * arising from the use of this software.
- *
- * Permission is granted to anyone to use this software for any purpose,
- * including commercial applications, and to alter it and redistribute it
- * freely, subject to the following restrictions:
- *
- * 1. The origin of this software must not be misrepresented; you must not
- *    claim that you wrote the original software. If you use this software
- *    in a product, an acknowledgment in the product documentation would be
- *    appreciated but is not required.
- * 2. Altered source versions must be plainly marked as such, and must not be
- *    misrepresented as being the original software.
- * 3. This notice may not be removed or altered from any source distribution.
- */
-
-#ifndef NO_UNDERLINE
-#define	match_init	_match_init
-#define	longest_match	_longest_match
-#endif
-
-#define	MAX_MATCH	(258)
-#define	MIN_MATCH	(3)
-#define	MIN_LOOKAHEAD	(MAX_MATCH + MIN_MATCH + 1)
-#define	MAX_MATCH_8	((MAX_MATCH + 7) & ~7)
-
-/* stack frame offsets */
-
-#define	chainlenwmask		0	/* high word: current chain len	*/
-					/* low word: s->wmask		*/
-#define	window			4	/* local copy of s->window	*/
-#define	windowbestlen		8	/* s->window + bestlen		*/
-#define	scanstart		16	/* first two bytes of string	*/
-#define	scanend			12	/* last two bytes of string	*/
-#define	scanalign		20	/* dword-misalignment of string	*/
-#define	nicematch		24	/* a good enough match size	*/
-#define	bestlen			28	/* size of best match so far	*/
-#define	scan			32	/* ptr to string wanting match	*/
-
-#define	LocalVarsSize		(36)
-/*	saved ebx		36 */
-/*	saved edi		40 */
-/*	saved esi		44 */
-/*	saved ebp		48 */
-/*	return address		52 */
-#define	deflatestate		56	/* the function arguments	*/
-#define	curmatch		60
-
-/* All the +zlib1222add offsets are due to the addition of fields
- *  in zlib in the deflate_state structure since the asm code was first written
- * (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)").
- * (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0").
- * if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8").
- */
-
-#define zlib1222add		(8)
-
-#define	dsWSize			(36+zlib1222add)
-#define	dsWMask			(44+zlib1222add)
-#define	dsWindow		(48+zlib1222add)
-#define	dsPrev			(56+zlib1222add)
-#define	dsMatchLen		(88+zlib1222add)
-#define	dsPrevMatch		(92+zlib1222add)
-#define	dsStrStart		(100+zlib1222add)
-#define	dsMatchStart		(104+zlib1222add)
-#define	dsLookahead		(108+zlib1222add)
-#define	dsPrevLen		(112+zlib1222add)
-#define	dsMaxChainLen		(116+zlib1222add)
-#define	dsGoodMatch		(132+zlib1222add)
-#define	dsNiceMatch		(136+zlib1222add)
-
-
-.file "match.S"
-
-.globl	match_init, longest_match
-
-.text
-
-/* uInt longest_match(deflate_state *deflatestate, IPos curmatch) */
-.cfi_sections	.debug_frame
-
-longest_match:
-
-.cfi_startproc
-/* Save registers that the compiler may be using, and adjust %esp to	*/
-/* make room for our stack frame.					*/
-
-		pushl	%ebp
-		.cfi_def_cfa_offset 8
-		.cfi_offset ebp, -8
-		pushl	%edi
-		.cfi_def_cfa_offset 12
-		pushl	%esi
-		.cfi_def_cfa_offset 16
-		pushl	%ebx
-		.cfi_def_cfa_offset 20
-		subl	$LocalVarsSize, %esp
-		.cfi_def_cfa_offset LocalVarsSize+20
-
-/* Retrieve the function arguments. %ecx will hold cur_match		*/
-/* throughout the entire function. %edx will hold the pointer to the	*/
-/* deflate_state structure during the function's setup (before		*/
-/* entering the main loop).						*/
-
-		movl	deflatestate(%esp), %edx
-		movl	curmatch(%esp), %ecx
-
-/* uInt wmask = s->w_mask;						*/
-/* unsigned chain_length = s->max_chain_length;				*/
-/* if (s->prev_length >= s->good_match) {				*/
-/*     chain_length >>= 2;						*/
-/* }									*/
- 
-		movl	dsPrevLen(%edx), %eax
-		movl	dsGoodMatch(%edx), %ebx
-		cmpl	%ebx, %eax
-		movl	dsWMask(%edx), %eax
-		movl	dsMaxChainLen(%edx), %ebx
-		jl	LastMatchGood
-		shrl	$2, %ebx
-LastMatchGood:
-
-/* chainlen is decremented once beforehand so that the function can	*/
-/* use the sign flag instead of the zero flag for the exit test.	*/
-/* It is then shifted into the high word, to make room for the wmask	*/
-/* value, which it will always accompany.				*/
-
-		decl	%ebx
-		shll	$16, %ebx
-		orl	%eax, %ebx
-		movl	%ebx, chainlenwmask(%esp)
-
-/* if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;	*/
-
-		movl	dsNiceMatch(%edx), %eax
-		movl	dsLookahead(%edx), %ebx
-		cmpl	%eax, %ebx
-		jl	LookaheadLess
-		movl	%eax, %ebx
-LookaheadLess:	movl	%ebx, nicematch(%esp)
-
-/* register Bytef *scan = s->window + s->strstart;			*/
-
-		movl	dsWindow(%edx), %esi
-		movl	%esi, window(%esp)
-		movl	dsStrStart(%edx), %ebp
-		lea	(%esi,%ebp), %edi
-		movl	%edi, scan(%esp)
-
-/* Determine how many bytes the scan ptr is off from being		*/
-/* dword-aligned.							*/
-
-		movl	%edi, %eax
-		negl	%eax
-		andl	$3, %eax
-		movl	%eax, scanalign(%esp)
-
-/* IPos limit = s->strstart > (IPos)MAX_DIST(s) ?			*/
-/*     s->strstart - (IPos)MAX_DIST(s) : NIL;				*/
-
-		movl	dsWSize(%edx), %eax
-		subl	$MIN_LOOKAHEAD, %eax
-		subl	%eax, %ebp
-		jg	LimitPositive
-		xorl	%ebp, %ebp
-LimitPositive:
-
-/* int best_len = s->prev_length;					*/
-
-		movl	dsPrevLen(%edx), %eax
-		movl	%eax, bestlen(%esp)
-
-/* Store the sum of s->window + best_len in %esi locally, and in %esi.	*/
-
-		addl	%eax, %esi
-		movl	%esi, windowbestlen(%esp)
-
-/* register ush scan_start = *(ushf*)scan;				*/
-/* register ush scan_end   = *(ushf*)(scan+best_len-1);			*/
-/* Posf *prev = s->prev;						*/
-
-		movzwl	(%edi), %ebx
-		movl	%ebx, scanstart(%esp)
-		movzwl	-1(%edi,%eax), %ebx
-		movl	%ebx, scanend(%esp)
-		movl	dsPrev(%edx), %edi
-
-/* Jump into the main loop.						*/
-
-		movl	chainlenwmask(%esp), %edx
-		jmp	LoopEntry
-
-.balign 16
-
-/* do {
- *     match = s->window + cur_match;
- *     if (*(ushf*)(match+best_len-1) != scan_end ||
- *         *(ushf*)match != scan_start) continue;
- *     [...]
- * } while ((cur_match = prev[cur_match & wmask]) > limit
- *          && --chain_length != 0);
- *
- * Here is the inner loop of the function. The function will spend the
- * majority of its time in this loop, and majority of that time will
- * be spent in the first ten instructions.
- *
- * Within this loop:
- * %ebx = scanend
- * %ecx = curmatch
- * %edx = chainlenwmask - i.e., ((chainlen << 16) | wmask)
- * %esi = windowbestlen - i.e., (window + bestlen)
- * %edi = prev
- * %ebp = limit
- */
-LookupLoop:
-		andl	%edx, %ecx
-		movzwl	(%edi,%ecx,2), %ecx
-		cmpl	%ebp, %ecx
-		jbe	LeaveNow
-		subl	$0x00010000, %edx
-		js	LeaveNow
-LoopEntry:	movzwl	-1(%esi,%ecx), %eax
-		cmpl	%ebx, %eax
-		jnz	LookupLoop
-		movl	window(%esp), %eax
-		movzwl	(%eax,%ecx), %eax
-		cmpl	scanstart(%esp), %eax
-		jnz	LookupLoop
-
-/* Store the current value of chainlen.					*/
-
-		movl	%edx, chainlenwmask(%esp)
-
-/* Point %edi to the string under scrutiny, and %esi to the string we	*/
-/* are hoping to match it up with. In actuality, %esi and %edi are	*/
-/* both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and %edx is	*/
-/* initialized to -(MAX_MATCH_8 - scanalign).				*/
-
-		movl	window(%esp), %esi
-		movl	scan(%esp), %edi
-		addl	%ecx, %esi
-		movl	scanalign(%esp), %eax
-		movl	$(-MAX_MATCH_8), %edx
-		lea	MAX_MATCH_8(%edi,%eax), %edi
-		lea	MAX_MATCH_8(%esi,%eax), %esi
-
-/* Test the strings for equality, 8 bytes at a time. At the end,
- * adjust %edx so that it is offset to the exact byte that mismatched.
- *
- * We already know at this point that the first three bytes of the
- * strings match each other, and they can be safely passed over before
- * starting the compare loop. So what this code does is skip over 0-3
- * bytes, as much as necessary in order to dword-align the %edi
- * pointer. (%esi will still be misaligned three times out of four.)
- *
- * It should be confessed that this loop usually does not represent
- * much of the total running time. Replacing it with a more
- * straightforward "rep cmpsb" would not drastically degrade
- * performance.
- */
-LoopCmps:
-		movl	(%esi,%edx), %eax
-		xorl	(%edi,%edx), %eax
-		jnz	LeaveLoopCmps
-		movl	4(%esi,%edx), %eax
-		xorl	4(%edi,%edx), %eax
-		jnz	LeaveLoopCmps4
-		addl	$8, %edx
-		jnz	LoopCmps
-		jmp	LenMaximum
-LeaveLoopCmps4:	addl	$4, %edx
-LeaveLoopCmps:	testl	$0x0000FFFF, %eax
-		jnz	LenLower
-		addl	$2, %edx
-		shrl	$16, %eax
-LenLower:	subb	$1, %al
-		adcl	$0, %edx
-
-/* Calculate the length of the match. If it is longer than MAX_MATCH,	*/
-/* then automatically accept it as the best possible match and leave.	*/
-
-		lea	(%edi,%edx), %eax
-		movl	scan(%esp), %edi
-		subl	%edi, %eax
-		cmpl	$MAX_MATCH, %eax
-		jge	LenMaximum
-
-/* If the length of the match is not longer than the best match we	*/
-/* have so far, then forget it and return to the lookup loop.		*/
-
-		movl	deflatestate(%esp), %edx
-		movl	bestlen(%esp), %ebx
-		cmpl	%ebx, %eax
-		jg	LongerMatch
-		movl	windowbestlen(%esp), %esi
-		movl	dsPrev(%edx), %edi
-		movl	scanend(%esp), %ebx
-		movl	chainlenwmask(%esp), %edx
-		jmp	LookupLoop
-
-/*         s->match_start = cur_match;					*/
-/*         best_len = len;						*/
-/*         if (len >= nice_match) break;				*/
-/*         scan_end = *(ushf*)(scan+best_len-1);			*/
-
-LongerMatch:	movl	nicematch(%esp), %ebx
-		movl	%eax, bestlen(%esp)
-		movl	%ecx, dsMatchStart(%edx)
-		cmpl	%ebx, %eax
-		jge	LeaveNow
-		movl	window(%esp), %esi
-		addl	%eax, %esi
-		movl	%esi, windowbestlen(%esp)
-		movzwl	-1(%edi,%eax), %ebx
-		movl	dsPrev(%edx), %edi
-		movl	%ebx, scanend(%esp)
-		movl	chainlenwmask(%esp), %edx
-		jmp	LookupLoop
-
-/* Accept the current string, with the maximum possible length.		*/
-
-LenMaximum:	movl	deflatestate(%esp), %edx
-		movl	$MAX_MATCH, bestlen(%esp)
-		movl	%ecx, dsMatchStart(%edx)
-
-/* if ((uInt)best_len <= s->lookahead) return (uInt)best_len;		*/
-/* return s->lookahead;							*/
-
-LeaveNow:
-		movl	deflatestate(%esp), %edx
-		movl	bestlen(%esp), %ebx
-		movl	dsLookahead(%edx), %eax
-		cmpl	%eax, %ebx
-		jg	LookaheadRet
-		movl	%ebx, %eax
-LookaheadRet:
-
-/* Restore the stack and return from whence we came.			*/
-
-		addl	$LocalVarsSize, %esp
-		.cfi_def_cfa_offset 20
-		popl	%ebx
-		.cfi_def_cfa_offset 16
-		popl	%esi
-		.cfi_def_cfa_offset 12
-		popl	%edi
-		.cfi_def_cfa_offset 8
-		popl	%ebp
-		.cfi_def_cfa_offset 4
-.cfi_endproc
-match_init:	ret
diff --git a/src/png/zlib/contrib/blast/Makefile b/src/png/zlib/contrib/blast/Makefile
deleted file mode 100644
index 9be80bafe..000000000
--- a/src/png/zlib/contrib/blast/Makefile
+++ /dev/null
@@ -1,8 +0,0 @@
-blast: blast.c blast.h
-	cc -DTEST -o blast blast.c
-
-test: blast
-	blast < test.pk | cmp - test.txt
-
-clean:
-	rm -f blast blast.o
diff --git a/src/png/zlib/contrib/blast/README b/src/png/zlib/contrib/blast/README
deleted file mode 100644
index e3a60b3f5..000000000
--- a/src/png/zlib/contrib/blast/README
+++ /dev/null
@@ -1,4 +0,0 @@
-Read blast.h for purpose and usage.
-
-Mark Adler
-madler@alumni.caltech.edu
diff --git a/src/png/zlib/contrib/blast/blast.c b/src/png/zlib/contrib/blast/blast.c
deleted file mode 100644
index e6e659073..000000000
--- a/src/png/zlib/contrib/blast/blast.c
+++ /dev/null
@@ -1,466 +0,0 @@
-/* blast.c
- * Copyright (C) 2003, 2012, 2013 Mark Adler
- * For conditions of distribution and use, see copyright notice in blast.h
- * version 1.3, 24 Aug 2013
- *
- * blast.c decompresses data compressed by the PKWare Compression Library.
- * This function provides functionality similar to the explode() function of
- * the PKWare library, hence the name "blast".
- *
- * This decompressor is based on the excellent format description provided by
- * Ben Rudiak-Gould in comp.compression on August 13, 2001.  Interestingly, the
- * example Ben provided in the post is incorrect.  The distance 110001 should
- * instead be 111000.  When corrected, the example byte stream becomes:
- *
- *    00 04 82 24 25 8f 80 7f
- *
- * which decompresses to "AIAIAIAIAIAIA" (without the quotes).
- */
-
-/*
- * Change history:
- *
- * 1.0  12 Feb 2003     - First version
- * 1.1  16 Feb 2003     - Fixed distance check for > 4 GB uncompressed data
- * 1.2  24 Oct 2012     - Add note about using binary mode in stdio
- *                      - Fix comparisons of differently signed integers
- * 1.3  24 Aug 2013     - Return unused input from blast()
- *                      - Fix test code to correctly report unused input
- *                      - Enable the provision of initial input to blast()
- */
-
-#include <stddef.h>             /* for NULL */
-#include <setjmp.h>             /* for setjmp(), longjmp(), and jmp_buf */
-#include "blast.h"              /* prototype for blast() */
-
-#define local static            /* for local function definitions */
-#define MAXBITS 13              /* maximum code length */
-#define MAXWIN 4096             /* maximum window size */
-
-/* input and output state */
-struct state {
-    /* input state */
-    blast_in infun;             /* input function provided by user */
-    void *inhow;                /* opaque information passed to infun() */
-    unsigned char *in;          /* next input location */
-    unsigned left;              /* available input at in */
-    int bitbuf;                 /* bit buffer */
-    int bitcnt;                 /* number of bits in bit buffer */
-
-    /* input limit error return state for bits() and decode() */
-    jmp_buf env;
-
-    /* output state */
-    blast_out outfun;           /* output function provided by user */
-    void *outhow;               /* opaque information passed to outfun() */
-    unsigned next;              /* index of next write location in out[] */
-    int first;                  /* true to check distances (for first 4K) */
-    unsigned char out[MAXWIN];  /* output buffer and sliding window */
-};
-
-/*
- * Return need bits from the input stream.  This always leaves less than
- * eight bits in the buffer.  bits() works properly for need == 0.
- *
- * Format notes:
- *
- * - Bits are stored in bytes from the least significant bit to the most
- *   significant bit.  Therefore bits are dropped from the bottom of the bit
- *   buffer, using shift right, and new bytes are appended to the top of the
- *   bit buffer, using shift left.
- */
-local int bits(struct state *s, int need)
-{
-    int val;            /* bit accumulator */
-
-    /* load at least need bits into val */
-    val = s->bitbuf;
-    while (s->bitcnt < need) {
-        if (s->left == 0) {
-            s->left = s->infun(s->inhow, &(s->in));
-            if (s->left == 0) longjmp(s->env, 1);       /* out of input */
-        }
-        val |= (int)(*(s->in)++) << s->bitcnt;          /* load eight bits */
-        s->left--;
-        s->bitcnt += 8;
-    }
-
-    /* drop need bits and update buffer, always zero to seven bits left */
-    s->bitbuf = val >> need;
-    s->bitcnt -= need;
-
-    /* return need bits, zeroing the bits above that */
-    return val & ((1 << need) - 1);
-}
-
-/*
- * Huffman code decoding tables.  count[1..MAXBITS] is the number of symbols of
- * each length, which for a canonical code are stepped through in order.
- * symbol[] are the symbol values in canonical order, where the number of
- * entries is the sum of the counts in count[].  The decoding process can be
- * seen in the function decode() below.
- */
-struct huffman {
-    short *count;       /* number of symbols of each length */
-    short *symbol;      /* canonically ordered symbols */
-};
-
-/*
- * Decode a code from the stream s using huffman table h.  Return the symbol or
- * a negative value if there is an error.  If all of the lengths are zero, i.e.
- * an empty code, or if the code is incomplete and an invalid code is received,
- * then -9 is returned after reading MAXBITS bits.
- *
- * Format notes:
- *
- * - The codes as stored in the compressed data are bit-reversed relative to
- *   a simple integer ordering of codes of the same lengths.  Hence below the
- *   bits are pulled from the compressed data one at a time and used to
- *   build the code value reversed from what is in the stream in order to
- *   permit simple integer comparisons for decoding.
- *
- * - The first code for the shortest length is all ones.  Subsequent codes of
- *   the same length are simply integer decrements of the previous code.  When
- *   moving up a length, a one bit is appended to the code.  For a complete
- *   code, the last code of the longest length will be all zeros.  To support
- *   this ordering, the bits pulled during decoding are inverted to apply the
- *   more "natural" ordering starting with all zeros and incrementing.
- */
-local int decode(struct state *s, struct huffman *h)
-{
-    int len;            /* current number of bits in code */
-    int code;           /* len bits being decoded */
-    int first;          /* first code of length len */
-    int count;          /* number of codes of length len */
-    int index;          /* index of first code of length len in symbol table */
-    int bitbuf;         /* bits from stream */
-    int left;           /* bits left in next or left to process */
-    short *next;        /* next number of codes */
-
-    bitbuf = s->bitbuf;
-    left = s->bitcnt;
-    code = first = index = 0;
-    len = 1;
-    next = h->count + 1;
-    while (1) {
-        while (left--) {
-            code |= (bitbuf & 1) ^ 1;   /* invert code */
-            bitbuf >>= 1;
-            count = *next++;
-            if (code < first + count) { /* if length len, return symbol */
-                s->bitbuf = bitbuf;
-                s->bitcnt = (s->bitcnt - len) & 7;
-                return h->symbol[index + (code - first)];
-            }
-            index += count;             /* else update for next length */
-            first += count;
-            first <<= 1;
-            code <<= 1;
-            len++;
-        }
-        left = (MAXBITS+1) - len;
-        if (left == 0) break;
-        if (s->left == 0) {
-            s->left = s->infun(s->inhow, &(s->in));
-            if (s->left == 0) longjmp(s->env, 1);       /* out of input */
-        }
-        bitbuf = *(s->in)++;
-        s->left--;
-        if (left > 8) left = 8;
-    }
-    return -9;                          /* ran out of codes */
-}
-
-/*
- * Given a list of repeated code lengths rep[0..n-1], where each byte is a
- * count (high four bits + 1) and a code length (low four bits), generate the
- * list of code lengths.  This compaction reduces the size of the object code.
- * Then given the list of code lengths length[0..n-1] representing a canonical
- * Huffman code for n symbols, construct the tables required to decode those
- * codes.  Those tables are the number of codes of each length, and the symbols
- * sorted by length, retaining their original order within each length.  The
- * return value is zero for a complete code set, negative for an over-
- * subscribed code set, and positive for an incomplete code set.  The tables
- * can be used if the return value is zero or positive, but they cannot be used
- * if the return value is negative.  If the return value is zero, it is not
- * possible for decode() using that table to return an error--any stream of
- * enough bits will resolve to a symbol.  If the return value is positive, then
- * it is possible for decode() using that table to return an error for received
- * codes past the end of the incomplete lengths.
- */
-local int construct(struct huffman *h, const unsigned char *rep, int n)
-{
-    int symbol;         /* current symbol when stepping through length[] */
-    int len;            /* current length when stepping through h->count[] */
-    int left;           /* number of possible codes left of current length */
-    short offs[MAXBITS+1];      /* offsets in symbol table for each length */
-    short length[256];  /* code lengths */
-
-    /* convert compact repeat counts into symbol bit length list */
-    symbol = 0;
-    do {
-        len = *rep++;
-        left = (len >> 4) + 1;
-        len &= 15;
-        do {
-            length[symbol++] = len;
-        } while (--left);
-    } while (--n);
-    n = symbol;
-
-    /* count number of codes of each length */
-    for (len = 0; len <= MAXBITS; len++)
-        h->count[len] = 0;
-    for (symbol = 0; symbol < n; symbol++)
-        (h->count[length[symbol]])++;   /* assumes lengths are within bounds */
-    if (h->count[0] == n)               /* no codes! */
-        return 0;                       /* complete, but decode() will fail */
-
-    /* check for an over-subscribed or incomplete set of lengths */
-    left = 1;                           /* one possible code of zero length */
-    for (len = 1; len <= MAXBITS; len++) {
-        left <<= 1;                     /* one more bit, double codes left */
-        left -= h->count[len];          /* deduct count from possible codes */
-        if (left < 0) return left;      /* over-subscribed--return negative */
-    }                                   /* left > 0 means incomplete */
-
-    /* generate offsets into symbol table for each length for sorting */
-    offs[1] = 0;
-    for (len = 1; len < MAXBITS; len++)
-        offs[len + 1] = offs[len] + h->count[len];
-
-    /*
-     * put symbols in table sorted by length, by symbol order within each
-     * length
-     */
-    for (symbol = 0; symbol < n; symbol++)
-        if (length[symbol] != 0)
-            h->symbol[offs[length[symbol]]++] = symbol;
-
-    /* return zero for complete set, positive for incomplete set */
-    return left;
-}
-
-/*
- * Decode PKWare Compression Library stream.
- *
- * Format notes:
- *
- * - First byte is 0 if literals are uncoded or 1 if they are coded.  Second
- *   byte is 4, 5, or 6 for the number of extra bits in the distance code.
- *   This is the base-2 logarithm of the dictionary size minus six.
- *
- * - Compressed data is a combination of literals and length/distance pairs
- *   terminated by an end code.  Literals are either Huffman coded or
- *   uncoded bytes.  A length/distance pair is a coded length followed by a
- *   coded distance to represent a string that occurs earlier in the
- *   uncompressed data that occurs again at the current location.
- *
- * - A bit preceding a literal or length/distance pair indicates which comes
- *   next, 0 for literals, 1 for length/distance.
- *
- * - If literals are uncoded, then the next eight bits are the literal, in the
- *   normal bit order in the stream, i.e. no bit-reversal is needed. Similarly,
- *   no bit reversal is needed for either the length extra bits or the distance
- *   extra bits.
- *
- * - Literal bytes are simply written to the output.  A length/distance pair is
- *   an instruction to copy previously uncompressed bytes to the output.  The
- *   copy is from distance bytes back in the output stream, copying for length
- *   bytes.
- *
- * - Distances pointing before the beginning of the output data are not
- *   permitted.
- *
- * - Overlapped copies, where the length is greater than the distance, are
- *   allowed and common.  For example, a distance of one and a length of 518
- *   simply copies the last byte 518 times.  A distance of four and a length of
- *   twelve copies the last four bytes three times.  A simple forward copy
- *   ignoring whether the length is greater than the distance or not implements
- *   this correctly.
- */
-local int decomp(struct state *s)
-{
-    int lit;            /* true if literals are coded */
-    int dict;           /* log2(dictionary size) - 6 */
-    int symbol;         /* decoded symbol, extra bits for distance */
-    int len;            /* length for copy */
-    unsigned dist;      /* distance for copy */
-    int copy;           /* copy counter */
-    unsigned char *from, *to;   /* copy pointers */
-    static int virgin = 1;                              /* build tables once */
-    static short litcnt[MAXBITS+1], litsym[256];        /* litcode memory */
-    static short lencnt[MAXBITS+1], lensym[16];         /* lencode memory */
-    static short distcnt[MAXBITS+1], distsym[64];       /* distcode memory */
-    static struct huffman litcode = {litcnt, litsym};   /* length code */
-    static struct huffman lencode = {lencnt, lensym};   /* length code */
-    static struct huffman distcode = {distcnt, distsym};/* distance code */
-        /* bit lengths of literal codes */
-    static const unsigned char litlen[] = {
-        11, 124, 8, 7, 28, 7, 188, 13, 76, 4, 10, 8, 12, 10, 12, 10, 8, 23, 8,
-        9, 7, 6, 7, 8, 7, 6, 55, 8, 23, 24, 12, 11, 7, 9, 11, 12, 6, 7, 22, 5,
-        7, 24, 6, 11, 9, 6, 7, 22, 7, 11, 38, 7, 9, 8, 25, 11, 8, 11, 9, 12,
-        8, 12, 5, 38, 5, 38, 5, 11, 7, 5, 6, 21, 6, 10, 53, 8, 7, 24, 10, 27,
-        44, 253, 253, 253, 252, 252, 252, 13, 12, 45, 12, 45, 12, 61, 12, 45,
-        44, 173};
-        /* bit lengths of length codes 0..15 */
-    static const unsigned char lenlen[] = {2, 35, 36, 53, 38, 23};
-        /* bit lengths of distance codes 0..63 */
-    static const unsigned char distlen[] = {2, 20, 53, 230, 247, 151, 248};
-    static const short base[16] = {     /* base for length codes */
-        3, 2, 4, 5, 6, 7, 8, 9, 10, 12, 16, 24, 40, 72, 136, 264};
-    static const char extra[16] = {     /* extra bits for length codes */
-        0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8};
-
-    /* set up decoding tables (once--might not be thread-safe) */
-    if (virgin) {
-        construct(&litcode, litlen, sizeof(litlen));
-        construct(&lencode, lenlen, sizeof(lenlen));
-        construct(&distcode, distlen, sizeof(distlen));
-        virgin = 0;
-    }
-
-    /* read header */
-    lit = bits(s, 8);
-    if (lit > 1) return -1;
-    dict = bits(s, 8);
-    if (dict < 4 || dict > 6) return -2;
-
-    /* decode literals and length/distance pairs */
-    do {
-        if (bits(s, 1)) {
-            /* get length */
-            symbol = decode(s, &lencode);
-            len = base[symbol] + bits(s, extra[symbol]);
-            if (len == 519) break;              /* end code */
-
-            /* get distance */
-            symbol = len == 2 ? 2 : dict;
-            dist = decode(s, &distcode) << symbol;
-            dist += bits(s, symbol);
-            dist++;
-            if (s->first && dist > s->next)
-                return -3;              /* distance too far back */
-
-            /* copy length bytes from distance bytes back */
-            do {
-                to = s->out + s->next;
-                from = to - dist;
-                copy = MAXWIN;
-                if (s->next < dist) {
-                    from += copy;
-                    copy = dist;
-                }
-                copy -= s->next;
-                if (copy > len) copy = len;
-                len -= copy;
-                s->next += copy;
-                do {
-                    *to++ = *from++;
-                } while (--copy);
-                if (s->next == MAXWIN) {
-                    if (s->outfun(s->outhow, s->out, s->next)) return 1;
-                    s->next = 0;
-                    s->first = 0;
-                }
-            } while (len != 0);
-        }
-        else {
-            /* get literal and write it */
-            symbol = lit ? decode(s, &litcode) : bits(s, 8);
-            s->out[s->next++] = symbol;
-            if (s->next == MAXWIN) {
-                if (s->outfun(s->outhow, s->out, s->next)) return 1;
-                s->next = 0;
-                s->first = 0;
-            }
-        }
-    } while (1);
-    return 0;
-}
-
-/* See comments in blast.h */
-int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow,
-          unsigned *left, unsigned char **in)
-{
-    struct state s;             /* input/output state */
-    int err;                    /* return value */
-
-    /* initialize input state */
-    s.infun = infun;
-    s.inhow = inhow;
-    if (left != NULL && *left) {
-        s.left = *left;
-        s.in = *in;
-    }
-    else
-        s.left = 0;
-    s.bitbuf = 0;
-    s.bitcnt = 0;
-
-    /* initialize output state */
-    s.outfun = outfun;
-    s.outhow = outhow;
-    s.next = 0;
-    s.first = 1;
-
-    /* return if bits() or decode() tries to read past available input */
-    if (setjmp(s.env) != 0)             /* if came back here via longjmp(), */
-        err = 2;                        /*  then skip decomp(), return error */
-    else
-        err = decomp(&s);               /* decompress */
-
-    /* return unused input */
-    if (left != NULL)
-        *left = s.left;
-    if (in != NULL)
-        *in = s.left ? s.in : NULL;
-
-    /* write any leftover output and update the error code if needed */
-    if (err != 1 && s.next && s.outfun(s.outhow, s.out, s.next) && err == 0)
-        err = 1;
-    return err;
-}
-
-#ifdef TEST
-/* Example of how to use blast() */
-#include <stdio.h>
-#include <stdlib.h>
-
-#define CHUNK 16384
-
-local unsigned inf(void *how, unsigned char **buf)
-{
-    static unsigned char hold[CHUNK];
-
-    *buf = hold;
-    return fread(hold, 1, CHUNK, (FILE *)how);
-}
-
-local int outf(void *how, unsigned char *buf, unsigned len)
-{
-    return fwrite(buf, 1, len, (FILE *)how) != len;
-}
-
-/* Decompress a PKWare Compression Library stream from stdin to stdout */
-int main(void)
-{
-    int ret;
-    unsigned left;
-
-    /* decompress to stdout */
-    left = 0;
-    ret = blast(inf, stdin, outf, stdout, &left, NULL);
-    if (ret != 0)
-        fprintf(stderr, "blast error: %d\n", ret);
-
-    /* count any leftover bytes */
-    while (getchar() != EOF)
-        left++;
-    if (left)
-        fprintf(stderr, "blast warning: %u unused bytes of input\n", left);
-
-    /* return blast() error code */
-    return ret;
-}
-#endif
diff --git a/src/png/zlib/contrib/blast/blast.h b/src/png/zlib/contrib/blast/blast.h
deleted file mode 100644
index 6cf65eda1..000000000
--- a/src/png/zlib/contrib/blast/blast.h
+++ /dev/null
@@ -1,83 +0,0 @@
-/* blast.h -- interface for blast.c
-  Copyright (C) 2003, 2012, 2013 Mark Adler
-  version 1.3, 24 Aug 2013
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the author be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-
-  Mark Adler    madler@alumni.caltech.edu
- */
-
-
-/*
- * blast() decompresses the PKWare Data Compression Library (DCL) compressed
- * format.  It provides the same functionality as the explode() function in
- * that library.  (Note: PKWare overused the "implode" verb, and the format
- * used by their library implode() function is completely different and
- * incompatible with the implode compression method supported by PKZIP.)
- *
- * The binary mode for stdio functions should be used to assure that the
- * compressed data is not corrupted when read or written.  For example:
- * fopen(..., "rb") and fopen(..., "wb").
- */
-
-
-typedef unsigned (*blast_in)(void *how, unsigned char **buf);
-typedef int (*blast_out)(void *how, unsigned char *buf, unsigned len);
-/* Definitions for input/output functions passed to blast().  See below for
- * what the provided functions need to do.
- */
-
-
-int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow,
-          unsigned *left, unsigned char **in);
-/* Decompress input to output using the provided infun() and outfun() calls.
- * On success, the return value of blast() is zero.  If there is an error in
- * the source data, i.e. it is not in the proper format, then a negative value
- * is returned.  If there is not enough input available or there is not enough
- * output space, then a positive error is returned.
- *
- * The input function is invoked: len = infun(how, &buf), where buf is set by
- * infun() to point to the input buffer, and infun() returns the number of
- * available bytes there.  If infun() returns zero, then blast() returns with
- * an input error.  (blast() only asks for input if it needs it.)  inhow is for
- * use by the application to pass an input descriptor to infun(), if desired.
- *
- * If left and in are not NULL and *left is not zero when blast() is called,
- * then the *left bytes are *in are consumed for input before infun() is used.
- *
- * The output function is invoked: err = outfun(how, buf, len), where the bytes
- * to be written are buf[0..len-1].  If err is not zero, then blast() returns
- * with an output error.  outfun() is always called with len <= 4096.  outhow
- * is for use by the application to pass an output descriptor to outfun(), if
- * desired.
- *
- * If there is any unused input, *left is set to the number of bytes that were
- * read and *in points to them.  Otherwise *left is set to zero and *in is set
- * to NULL.  If left or in are NULL, then they are not set.
- *
- * The return codes are:
- *
- *   2:  ran out of input before completing decompression
- *   1:  output error before completing decompression
- *   0:  successful decompression
- *  -1:  literal flag not zero or one
- *  -2:  dictionary size not in 4..6
- *  -3:  distance is too far back
- *
- * At the bottom of blast.c is an example program that uses blast() that can be
- * compiled to produce a command-line decompression filter by defining TEST.
- */
diff --git a/src/png/zlib/contrib/blast/test.pk b/src/png/zlib/contrib/blast/test.pk
deleted file mode 100644
index be10b2bbb..000000000
--- a/src/png/zlib/contrib/blast/test.pk
+++ /dev/null
diff --git a/src/png/zlib/contrib/blast/test.txt b/src/png/zlib/contrib/blast/test.txt
deleted file mode 100644
index bfdf1c5dc..000000000
--- a/src/png/zlib/contrib/blast/test.txt
+++ /dev/null
@@ -1 +0,0 @@
-AIAIAIAIAIAIA
\ No newline at end of file
diff --git a/src/png/zlib/contrib/delphi/ZLib.pas b/src/png/zlib/contrib/delphi/ZLib.pas
deleted file mode 100644
index 060e19911..000000000
--- a/src/png/zlib/contrib/delphi/ZLib.pas
+++ /dev/null
@@ -1,557 +0,0 @@
-{*******************************************************}
-{                                                       }
-{       Borland Delphi Supplemental Components          }
-{       ZLIB Data Compression Interface Unit            }
-{                                                       }
-{       Copyright (c) 1997,99 Borland Corporation       }
-{                                                       }
-{*******************************************************}
-
-{ Updated for zlib 1.2.x by Cosmin Truta <cosmint@cs.ubbcluj.ro> }
-
-unit ZLib;
-
-interface
-
-uses SysUtils, Classes;
-
-type
-  TAlloc = function (AppData: Pointer; Items, Size: Integer): Pointer; cdecl;
-  TFree = procedure (AppData, Block: Pointer); cdecl;
-
-  // Internal structure.  Ignore.
-  TZStreamRec = packed record
-    next_in: PChar;       // next input byte
-    avail_in: Integer;    // number of bytes available at next_in
-    total_in: Longint;    // total nb of input bytes read so far
-
-    next_out: PChar;      // next output byte should be put here
-    avail_out: Integer;   // remaining free space at next_out
-    total_out: Longint;   // total nb of bytes output so far
-
-    msg: PChar;           // last error message, NULL if no error
-    internal: Pointer;    // not visible by applications
-
-    zalloc: TAlloc;       // used to allocate the internal state
-    zfree: TFree;         // used to free the internal state
-    AppData: Pointer;     // private data object passed to zalloc and zfree
-
-    data_type: Integer;   // best guess about the data type: ascii or binary
-    adler: Longint;       // adler32 value of the uncompressed data
-    reserved: Longint;    // reserved for future use
-  end;
-
-  // Abstract ancestor class
-  TCustomZlibStream = class(TStream)
-  private
-    FStrm: TStream;
-    FStrmPos: Integer;
-    FOnProgress: TNotifyEvent;
-    FZRec: TZStreamRec;
-    FBuffer: array [Word] of Char;
-  protected
-    procedure Progress(Sender: TObject); dynamic;
-    property OnProgress: TNotifyEvent read FOnProgress write FOnProgress;
-    constructor Create(Strm: TStream);
-  end;
-
-{ TCompressionStream compresses data on the fly as data is written to it, and
-  stores the compressed data to another stream.
-
-  TCompressionStream is write-only and strictly sequential. Reading from the
-  stream will raise an exception. Using Seek to move the stream pointer
-  will raise an exception.
-
-  Output data is cached internally, written to the output stream only when
-  the internal output buffer is full.  All pending output data is flushed
-  when the stream is destroyed.
-
-  The Position property returns the number of uncompressed bytes of
-  data that have been written to the stream so far.
-
-  CompressionRate returns the on-the-fly percentage by which the original
-  data has been compressed:  (1 - (CompressedBytes / UncompressedBytes)) * 100
-  If raw data size = 100 and compressed data size = 25, the CompressionRate
-  is 75%
-
-  The OnProgress event is called each time the output buffer is filled and
-  written to the output stream.  This is useful for updating a progress
-  indicator when you are writing a large chunk of data to the compression
-  stream in a single call.}
-
-
-  TCompressionLevel = (clNone, clFastest, clDefault, clMax);
-
-  TCompressionStream = class(TCustomZlibStream)
-  private
-    function GetCompressionRate: Single;
-  public
-    constructor Create(CompressionLevel: TCompressionLevel; Dest: TStream);
-    destructor Destroy; override;
-    function Read(var Buffer; Count: Longint): Longint; override;
-    function Write(const Buffer; Count: Longint): Longint; override;
-    function Seek(Offset: Longint; Origin: Word): Longint; override;
-    property CompressionRate: Single read GetCompressionRate;
-    property OnProgress;
-  end;
-
-{ TDecompressionStream decompresses data on the fly as data is read from it.
-
-  Compressed data comes from a separate source stream.  TDecompressionStream
-  is read-only and unidirectional; you can seek forward in the stream, but not
-  backwards.  The special case of setting the stream position to zero is
-  allowed.  Seeking forward decompresses data until the requested position in
-  the uncompressed data has been reached.  Seeking backwards, seeking relative
-  to the end of the stream, requesting the size of the stream, and writing to
-  the stream will raise an exception.
-
-  The Position property returns the number of bytes of uncompressed data that
-  have been read from the stream so far.
-
-  The OnProgress event is called each time the internal input buffer of
-  compressed data is exhausted and the next block is read from the input stream.
-  This is useful for updating a progress indicator when you are reading a
-  large chunk of data from the decompression stream in a single call.}
-
-  TDecompressionStream = class(TCustomZlibStream)
-  public
-    constructor Create(Source: TStream);
-    destructor Destroy; override;
-    function Read(var Buffer; Count: Longint): Longint; override;
-    function Write(const Buffer; Count: Longint): Longint; override;
-    function Seek(Offset: Longint; Origin: Word): Longint; override;
-    property OnProgress;
-  end;
-
-
-
-{ CompressBuf compresses data, buffer to buffer, in one call.
-   In: InBuf = ptr to compressed data
-       InBytes = number of bytes in InBuf
-  Out: OutBuf = ptr to newly allocated buffer containing decompressed data
-       OutBytes = number of bytes in OutBuf   }
-procedure CompressBuf(const InBuf: Pointer; InBytes: Integer;
-                      out OutBuf: Pointer; out OutBytes: Integer);
-
-
-{ DecompressBuf decompresses data, buffer to buffer, in one call.
-   In: InBuf = ptr to compressed data
-       InBytes = number of bytes in InBuf
-       OutEstimate = zero, or est. size of the decompressed data
-  Out: OutBuf = ptr to newly allocated buffer containing decompressed data
-       OutBytes = number of bytes in OutBuf   }
-procedure DecompressBuf(const InBuf: Pointer; InBytes: Integer;
- OutEstimate: Integer; out OutBuf: Pointer; out OutBytes: Integer);
-
-{ DecompressToUserBuf decompresses data, buffer to buffer, in one call.
-   In: InBuf = ptr to compressed data
-       InBytes = number of bytes in InBuf
-  Out: OutBuf = ptr to user-allocated buffer to contain decompressed data
-       BufSize = number of bytes in OutBuf   }
-procedure DecompressToUserBuf(const InBuf: Pointer; InBytes: Integer;
-  const OutBuf: Pointer; BufSize: Integer);
-
-const
-  zlib_version = '1.2.11';
-
-type
-  EZlibError = class(Exception);
-  ECompressionError = class(EZlibError);
-  EDecompressionError = class(EZlibError);
-
-implementation
-
-uses ZLibConst;
-
-const
-  Z_NO_FLUSH      = 0;
-  Z_PARTIAL_FLUSH = 1;
-  Z_SYNC_FLUSH    = 2;
-  Z_FULL_FLUSH    = 3;
-  Z_FINISH        = 4;
-
-  Z_OK            = 0;
-  Z_STREAM_END    = 1;
-  Z_NEED_DICT     = 2;
-  Z_ERRNO         = (-1);
-  Z_STREAM_ERROR  = (-2);
-  Z_DATA_ERROR    = (-3);
-  Z_MEM_ERROR     = (-4);
-  Z_BUF_ERROR     = (-5);
-  Z_VERSION_ERROR = (-6);
-
-  Z_NO_COMPRESSION       =   0;
-  Z_BEST_SPEED           =   1;
-  Z_BEST_COMPRESSION     =   9;
-  Z_DEFAULT_COMPRESSION  = (-1);
-
-  Z_FILTERED            = 1;
-  Z_HUFFMAN_ONLY        = 2;
-  Z_RLE                 = 3;
-  Z_DEFAULT_STRATEGY    = 0;
-
-  Z_BINARY   = 0;
-  Z_ASCII    = 1;
-  Z_UNKNOWN  = 2;
-
-  Z_DEFLATED = 8;
-
-
-{$L adler32.obj}
-{$L compress.obj}
-{$L crc32.obj}
-{$L deflate.obj}
-{$L infback.obj}
-{$L inffast.obj}
-{$L inflate.obj}
-{$L inftrees.obj}
-{$L trees.obj}
-{$L uncompr.obj}
-{$L zutil.obj}
-
-procedure adler32; external;
-procedure compressBound; external;
-procedure crc32; external;
-procedure deflateInit2_; external;
-procedure deflateParams; external;
-
-function _malloc(Size: Integer): Pointer; cdecl;
-begin
-  Result := AllocMem(Size);
-end;
-
-procedure _free(Block: Pointer); cdecl;
-begin
-  FreeMem(Block);
-end;
-
-procedure _memset(P: Pointer; B: Byte; count: Integer); cdecl;
-begin
-  FillChar(P^, count, B);
-end;
-
-procedure _memcpy(dest, source: Pointer; count: Integer); cdecl;
-begin
-  Move(source^, dest^, count);
-end;
-
-
-
-// deflate compresses data
-function deflateInit_(var strm: TZStreamRec; level: Integer; version: PChar;
-  recsize: Integer): Integer; external;
-function deflate(var strm: TZStreamRec; flush: Integer): Integer; external;
-function deflateEnd(var strm: TZStreamRec): Integer; external;
-
-// inflate decompresses data
-function inflateInit_(var strm: TZStreamRec; version: PChar;
-  recsize: Integer): Integer; external;
-function inflate(var strm: TZStreamRec; flush: Integer): Integer; external;
-function inflateEnd(var strm: TZStreamRec): Integer; external;
-function inflateReset(var strm: TZStreamRec): Integer; external;
-
-
-function zlibAllocMem(AppData: Pointer; Items, Size: Integer): Pointer; cdecl;
-begin
-//  GetMem(Result, Items*Size);
-  Result := AllocMem(Items * Size);
-end;
-
-procedure zlibFreeMem(AppData, Block: Pointer); cdecl;
-begin
-  FreeMem(Block);
-end;
-
-{function zlibCheck(code: Integer): Integer;
-begin
-  Result := code;
-  if code < 0 then
-    raise EZlibError.Create('error');    //!!
-end;}
-
-function CCheck(code: Integer): Integer;
-begin
-  Result := code;
-  if code < 0 then
-    raise ECompressionError.Create('error'); //!!
-end;
-
-function DCheck(code: Integer): Integer;
-begin
-  Result := code;
-  if code < 0 then
-    raise EDecompressionError.Create('error');  //!!
-end;
-
-procedure CompressBuf(const InBuf: Pointer; InBytes: Integer;
-                      out OutBuf: Pointer; out OutBytes: Integer);
-var
-  strm: TZStreamRec;
-  P: Pointer;
-begin
-  FillChar(strm, sizeof(strm), 0);
-  strm.zalloc := zlibAllocMem;
-  strm.zfree := zlibFreeMem;
-  OutBytes := ((InBytes + (InBytes div 10) + 12) + 255) and not 255;
-  GetMem(OutBuf, OutBytes);
-  try
-    strm.next_in := InBuf;
-    strm.avail_in := InBytes;
-    strm.next_out := OutBuf;
-    strm.avail_out := OutBytes;
-    CCheck(deflateInit_(strm, Z_BEST_COMPRESSION, zlib_version, sizeof(strm)));
-    try
-      while CCheck(deflate(strm, Z_FINISH)) <> Z_STREAM_END do
-      begin
-        P := OutBuf;
-        Inc(OutBytes, 256);
-        ReallocMem(OutBuf, OutBytes);
-        strm.next_out := PChar(Integer(OutBuf) + (Integer(strm.next_out) - Integer(P)));
-        strm.avail_out := 256;
-      end;
-    finally
-      CCheck(deflateEnd(strm));
-    end;
-    ReallocMem(OutBuf, strm.total_out);
-    OutBytes := strm.total_out;
-  except
-    FreeMem(OutBuf);
-    raise
-  end;
-end;
-
-
-procedure DecompressBuf(const InBuf: Pointer; InBytes: Integer;
-  OutEstimate: Integer; out OutBuf: Pointer; out OutBytes: Integer);
-var
-  strm: TZStreamRec;
-  P: Pointer;
-  BufInc: Integer;
-begin
-  FillChar(strm, sizeof(strm), 0);
-  strm.zalloc := zlibAllocMem;
-  strm.zfree := zlibFreeMem;
-  BufInc := (InBytes + 255) and not 255;
-  if OutEstimate = 0 then
-    OutBytes := BufInc
-  else
-    OutBytes := OutEstimate;
-  GetMem(OutBuf, OutBytes);
-  try
-    strm.next_in := InBuf;
-    strm.avail_in := InBytes;
-    strm.next_out := OutBuf;
-    strm.avail_out := OutBytes;
-    DCheck(inflateInit_(strm, zlib_version, sizeof(strm)));
-    try
-      while DCheck(inflate(strm, Z_NO_FLUSH)) <> Z_STREAM_END do
-      begin
-        P := OutBuf;
-        Inc(OutBytes, BufInc);
-        ReallocMem(OutBuf, OutBytes);
-        strm.next_out := PChar(Integer(OutBuf) + (Integer(strm.next_out) - Integer(P)));
-        strm.avail_out := BufInc;
-      end;
-    finally
-      DCheck(inflateEnd(strm));
-    end;
-    ReallocMem(OutBuf, strm.total_out);
-    OutBytes := strm.total_out;
-  except
-    FreeMem(OutBuf);
-    raise
-  end;
-end;
-
-procedure DecompressToUserBuf(const InBuf: Pointer; InBytes: Integer;
-  const OutBuf: Pointer; BufSize: Integer);
-var
-  strm: TZStreamRec;
-begin
-  FillChar(strm, sizeof(strm), 0);
-  strm.zalloc := zlibAllocMem;
-  strm.zfree := zlibFreeMem;
-  strm.next_in := InBuf;
-  strm.avail_in := InBytes;
-  strm.next_out := OutBuf;
-  strm.avail_out := BufSize;
-  DCheck(inflateInit_(strm, zlib_version, sizeof(strm)));
-  try
-    if DCheck(inflate(strm, Z_FINISH)) <> Z_STREAM_END then
-      raise EZlibError.CreateRes(@sTargetBufferTooSmall);
-  finally
-    DCheck(inflateEnd(strm));
-  end;
-end;
-
-// TCustomZlibStream
-
-constructor TCustomZLibStream.Create(Strm: TStream);
-begin
-  inherited Create;
-  FStrm := Strm;
-  FStrmPos := Strm.Position;
-  FZRec.zalloc := zlibAllocMem;
-  FZRec.zfree := zlibFreeMem;
-end;
-
-procedure TCustomZLibStream.Progress(Sender: TObject);
-begin
-  if Assigned(FOnProgress) then FOnProgress(Sender);
-end;
-
-
-// TCompressionStream
-
-constructor TCompressionStream.Create(CompressionLevel: TCompressionLevel;
-  Dest: TStream);
-const
-  Levels: array [TCompressionLevel] of ShortInt =
-    (Z_NO_COMPRESSION, Z_BEST_SPEED, Z_DEFAULT_COMPRESSION, Z_BEST_COMPRESSION);
-begin
-  inherited Create(Dest);
-  FZRec.next_out := FBuffer;
-  FZRec.avail_out := sizeof(FBuffer);
-  CCheck(deflateInit_(FZRec, Levels[CompressionLevel], zlib_version, sizeof(FZRec)));
-end;
-
-destructor TCompressionStream.Destroy;
-begin
-  FZRec.next_in := nil;
-  FZRec.avail_in := 0;
-  try
-    if FStrm.Position <> FStrmPos then FStrm.Position := FStrmPos;
-    while (CCheck(deflate(FZRec, Z_FINISH)) <> Z_STREAM_END)
-      and (FZRec.avail_out = 0) do
-    begin
-      FStrm.WriteBuffer(FBuffer, sizeof(FBuffer));
-      FZRec.next_out := FBuffer;
-      FZRec.avail_out := sizeof(FBuffer);
-    end;
-    if FZRec.avail_out < sizeof(FBuffer) then
-      FStrm.WriteBuffer(FBuffer, sizeof(FBuffer) - FZRec.avail_out);
-  finally
-    deflateEnd(FZRec);
-  end;
-  inherited Destroy;
-end;
-
-function TCompressionStream.Read(var Buffer; Count: Longint): Longint;
-begin
-  raise ECompressionError.CreateRes(@sInvalidStreamOp);
-end;
-
-function TCompressionStream.Write(const Buffer; Count: Longint): Longint;
-begin
-  FZRec.next_in := @Buffer;
-  FZRec.avail_in := Count;
-  if FStrm.Position <> FStrmPos then FStrm.Position := FStrmPos;
-  while (FZRec.avail_in > 0) do
-  begin
-    CCheck(deflate(FZRec, 0));
-    if FZRec.avail_out = 0 then
-    begin
-      FStrm.WriteBuffer(FBuffer, sizeof(FBuffer));
-      FZRec.next_out := FBuffer;
-      FZRec.avail_out := sizeof(FBuffer);
-      FStrmPos := FStrm.Position;
-      Progress(Self);
-    end;
-  end;
-  Result := Count;
-end;
-
-function TCompressionStream.Seek(Offset: Longint; Origin: Word): Longint;
-begin
-  if (Offset = 0) and (Origin = soFromCurrent) then
-    Result := FZRec.total_in
-  else
-    raise ECompressionError.CreateRes(@sInvalidStreamOp);
-end;
-
-function TCompressionStream.GetCompressionRate: Single;
-begin
-  if FZRec.total_in = 0 then
-    Result := 0
-  else
-    Result := (1.0 - (FZRec.total_out / FZRec.total_in)) * 100.0;
-end;
-
-
-// TDecompressionStream
-
-constructor TDecompressionStream.Create(Source: TStream);
-begin
-  inherited Create(Source);
-  FZRec.next_in := FBuffer;
-  FZRec.avail_in := 0;
-  DCheck(inflateInit_(FZRec, zlib_version, sizeof(FZRec)));
-end;
-
-destructor TDecompressionStream.Destroy;
-begin
-  FStrm.Seek(-FZRec.avail_in, 1);
-  inflateEnd(FZRec);
-  inherited Destroy;
-end;
-
-function TDecompressionStream.Read(var Buffer; Count: Longint): Longint;
-begin
-  FZRec.next_out := @Buffer;
-  FZRec.avail_out := Count;
-  if FStrm.Position <> FStrmPos then FStrm.Position := FStrmPos;
-  while (FZRec.avail_out > 0) do
-  begin
-    if FZRec.avail_in = 0 then
-    begin
-      FZRec.avail_in := FStrm.Read(FBuffer, sizeof(FBuffer));
-      if FZRec.avail_in = 0 then
-      begin
-        Result := Count - FZRec.avail_out;
-        Exit;
-      end;
-      FZRec.next_in := FBuffer;
-      FStrmPos := FStrm.Position;
-      Progress(Self);
-    end;
-    CCheck(inflate(FZRec, 0));
-  end;
-  Result := Count;
-end;
-
-function TDecompressionStream.Write(const Buffer; Count: Longint): Longint;
-begin
-  raise EDecompressionError.CreateRes(@sInvalidStreamOp);
-end;
-
-function TDecompressionStream.Seek(Offset: Longint; Origin: Word): Longint;
-var
-  I: Integer;
-  Buf: array [0..4095] of Char;
-begin
-  if (Offset = 0) and (Origin = soFromBeginning) then
-  begin
-    DCheck(inflateReset(FZRec));
-    FZRec.next_in := FBuffer;
-    FZRec.avail_in := 0;
-    FStrm.Position := 0;
-    FStrmPos := 0;
-  end
-  else if ( (Offset >= 0) and (Origin = soFromCurrent)) or
-          ( ((Offset - FZRec.total_out) > 0) and (Origin = soFromBeginning)) then
-  begin
-    if Origin = soFromBeginning then Dec(Offset, FZRec.total_out);
-    if Offset > 0 then
-    begin
-      for I := 1 to Offset div sizeof(Buf) do
-        ReadBuffer(Buf, sizeof(Buf));
-      ReadBuffer(Buf, Offset mod sizeof(Buf));
-    end;
-  end
-  else
-    raise EDecompressionError.CreateRes(@sInvalidStreamOp);
-  Result := FZRec.total_out;
-end;
-
-
-end.
diff --git a/src/png/zlib/contrib/delphi/ZLibConst.pas b/src/png/zlib/contrib/delphi/ZLibConst.pas
deleted file mode 100644
index cdfe13671..000000000
--- a/src/png/zlib/contrib/delphi/ZLibConst.pas
+++ /dev/null
@@ -1,11 +0,0 @@
-unit ZLibConst;
-
-interface
-
-resourcestring
-  sTargetBufferTooSmall = 'ZLib error: target buffer may be too small';
-  sInvalidStreamOp = 'Invalid stream operation';
-
-implementation
-
-end.
diff --git a/src/png/zlib/contrib/delphi/readme.txt b/src/png/zlib/contrib/delphi/readme.txt
deleted file mode 100644
index 2dc9a8bba..000000000
--- a/src/png/zlib/contrib/delphi/readme.txt
+++ /dev/null
@@ -1,76 +0,0 @@
-
-Overview
-========
-
-This directory contains an update to the ZLib interface unit,
-distributed by Borland as a Delphi supplemental component.
-
-The original ZLib unit is Copyright (c) 1997,99 Borland Corp.,
-and is based on zlib version 1.0.4.  There are a series of bugs
-and security problems associated with that old zlib version, and
-we recommend the users to update their ZLib unit.
-
-
-Summary of modifications
-========================
-
-- Improved makefile, adapted to zlib version 1.2.1.
-
-- Some field types from TZStreamRec are changed from Integer to
-  Longint, for consistency with the zlib.h header, and for 64-bit
-  readiness.
-
-- The zlib_version constant is updated.
-
-- The new Z_RLE strategy has its corresponding symbolic constant.
-
-- The allocation and deallocation functions and function types
-  (TAlloc, TFree, zlibAllocMem and zlibFreeMem) are now cdecl,
-  and _malloc and _free are added as C RTL stubs.  As a result,
-  the original C sources of zlib can be compiled out of the box,
-  and linked to the ZLib unit.
-
-
-Suggestions for improvements
-============================
-
-Currently, the ZLib unit provides only a limited wrapper around
-the zlib library, and much of the original zlib functionality is
-missing.  Handling compressed file formats like ZIP/GZIP or PNG
-cannot be implemented without having this functionality.
-Applications that handle these formats are either using their own,
-duplicated code, or not using the ZLib unit at all.
-
-Here are a few suggestions:
-
-- Checksum class wrappers around adler32() and crc32(), similar
-  to the Java classes that implement the java.util.zip.Checksum
-  interface.
-
-- The ability to read and write raw deflate streams, without the
-  zlib stream header and trailer.  Raw deflate streams are used
-  in the ZIP file format.
-
-- The ability to read and write gzip streams, used in the GZIP
-  file format, and normally produced by the gzip program.
-
-- The ability to select a different compression strategy, useful
-  to PNG and MNG image compression, and to multimedia compression
-  in general.  Besides the compression level
-
-    TCompressionLevel = (clNone, clFastest, clDefault, clMax);
-
-  which, in fact, could have used the 'z' prefix and avoided
-  TColor-like symbols
-
-    TCompressionLevel = (zcNone, zcFastest, zcDefault, zcMax);
-
-  there could be a compression strategy
-
-    TCompressionStrategy = (zsDefault, zsFiltered, zsHuffmanOnly, zsRle);
-
-- ZIP and GZIP stream handling via TStreams.
-
-
---
-Cosmin Truta <cosmint@cs.ubbcluj.ro>
diff --git a/src/png/zlib/contrib/delphi/zlibd32.mak b/src/png/zlib/contrib/delphi/zlibd32.mak
deleted file mode 100644
index 9bb00b7cc..000000000
--- a/src/png/zlib/contrib/delphi/zlibd32.mak
+++ /dev/null
@@ -1,99 +0,0 @@
-# Makefile for zlib
-# For use with Delphi and C++ Builder under Win32
-# Updated for zlib 1.2.x by Cosmin Truta
-
-# ------------ Borland C++ ------------
-
-# This project uses the Delphi (fastcall/register) calling convention:
-LOC = -DZEXPORT=__fastcall -DZEXPORTVA=__cdecl
-
-CC = bcc32
-LD = bcc32
-AR = tlib
-# do not use "-pr" in CFLAGS
-CFLAGS = -a -d -k- -O2 $(LOC)
-LDFLAGS =
-
-
-# variables
-ZLIB_LIB = zlib.lib
-
-OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj
-OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj
-OBJP1 = +adler32.obj+compress.obj+crc32.obj+deflate.obj+gzclose.obj+gzlib.obj+gzread.obj
-OBJP2 = +gzwrite.obj+infback.obj+inffast.obj+inflate.obj+inftrees.obj+trees.obj+uncompr.obj+zutil.obj
-
-
-# targets
-all: $(ZLIB_LIB) example.exe minigzip.exe
-
-.c.obj:
-	$(CC) -c $(CFLAGS) $*.c
-
-adler32.obj: adler32.c zlib.h zconf.h
-
-compress.obj: compress.c zlib.h zconf.h
-
-crc32.obj: crc32.c zlib.h zconf.h crc32.h
-
-deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
-
-gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h
-
-gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h
-
-gzread.obj: gzread.c zlib.h zconf.h gzguts.h
-
-gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h
-
-infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h inffixed.h
-
-inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h
-
-inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h inffixed.h
-
-inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
-
-trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h
-
-uncompr.obj: uncompr.c zlib.h zconf.h
-
-zutil.obj: zutil.c zutil.h zlib.h zconf.h
-
-example.obj: test/example.c zlib.h zconf.h
-
-minigzip.obj: test/minigzip.c zlib.h zconf.h
-
-
-# For the sake of the old Borland make,
-# the command line is cut to fit in the MS-DOS 128 byte limit:
-$(ZLIB_LIB): $(OBJ1) $(OBJ2)
-	-del $(ZLIB_LIB)
-	$(AR) $(ZLIB_LIB) $(OBJP1)
-	$(AR) $(ZLIB_LIB) $(OBJP2)
-
-
-# testing
-test: example.exe minigzip.exe
-	example
-	echo hello world | minigzip | minigzip -d
-
-example.exe: example.obj $(ZLIB_LIB)
-	$(LD) $(LDFLAGS) example.obj $(ZLIB_LIB)
-
-minigzip.exe: minigzip.obj $(ZLIB_LIB)
-	$(LD) $(LDFLAGS) minigzip.obj $(ZLIB_LIB)
-
-
-# cleanup
-clean:
-	-del *.obj
-	-del *.exe
-	-del *.lib
-	-del *.tds
-	-del zlib.bak
-	-del foo.gz
-
diff --git a/src/png/zlib/contrib/dotzlib/DotZLib.build b/src/png/zlib/contrib/dotzlib/DotZLib.build
deleted file mode 100644
index e69630cec..000000000
--- a/src/png/zlib/contrib/dotzlib/DotZLib.build
+++ /dev/null
@@ -1,33 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<project name="DotZLib" default="build" basedir="./DotZLib">
-	<description>A .Net wrapper library around ZLib1.dll</description>
-
-	<property name="nunit.location" value="c:/program files/NUnit V2.1/bin" />
-	<property name="build.root" value="bin" />
-
-	<property name="debug" value="true" />
-	<property name="nunit" value="true" />
-
-	<property name="build.folder" value="${build.root}/debug/" if="${debug}" />
-	<property name="build.folder" value="${build.root}/release/" unless="${debug}" />
-
-	<target name="clean" description="Remove all generated files">
-		<delete dir="${build.root}" failonerror="false" />
-	</target>
-
-	<target name="build" description="compiles the source code">
-
-		<mkdir dir="${build.folder}" />
-		<csc target="library" output="${build.folder}DotZLib.dll" debug="${debug}">
-			<references basedir="${nunit.location}">
-				<includes if="${nunit}" name="nunit.framework.dll" />
-			</references>
-			<sources>
-				<includes name="*.cs" />
-				<excludes name="UnitTests.cs" unless="${nunit}" />
-			</sources>
-			<arg value="/d:nunit" if="${nunit}" />
-		</csc>
-	</target>
-
-</project>
\ No newline at end of file
diff --git a/src/png/zlib/contrib/dotzlib/DotZLib.chm b/src/png/zlib/contrib/dotzlib/DotZLib.chm
deleted file mode 100644
index f214a444a..000000000
--- a/src/png/zlib/contrib/dotzlib/DotZLib.chm
+++ /dev/null
diff --git a/src/png/zlib/contrib/dotzlib/DotZLib.sln b/src/png/zlib/contrib/dotzlib/DotZLib.sln
deleted file mode 100644
index 5d533d6bc..000000000
--- a/src/png/zlib/contrib/dotzlib/DotZLib.sln
+++ /dev/null
@@ -1,21 +0,0 @@
-Microsoft Visual Studio Solution File, Format Version 8.00
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DotZLib", "DotZLib\DotZLib.csproj", "{BB1EE0B1-1808-46CB-B786-949D91117FC5}"
-	ProjectSection(ProjectDependencies) = postProject
-	EndProjectSection
-EndProject
-Global
-	GlobalSection(SolutionConfiguration) = preSolution
-		Debug = Debug
-		Release = Release
-	EndGlobalSection
-	GlobalSection(ProjectConfiguration) = postSolution
-		{BB1EE0B1-1808-46CB-B786-949D91117FC5}.Debug.ActiveCfg = Debug|.NET
-		{BB1EE0B1-1808-46CB-B786-949D91117FC5}.Debug.Build.0 = Debug|.NET
-		{BB1EE0B1-1808-46CB-B786-949D91117FC5}.Release.ActiveCfg = Release|.NET
-		{BB1EE0B1-1808-46CB-B786-949D91117FC5}.Release.Build.0 = Release|.NET
-	EndGlobalSection
-	GlobalSection(ExtensibilityGlobals) = postSolution
-	EndGlobalSection
-	GlobalSection(ExtensibilityAddIns) = postSolution
-	EndGlobalSection
-EndGlobal
diff --git a/src/png/zlib/contrib/dotzlib/DotZLib/AssemblyInfo.cs b/src/png/zlib/contrib/dotzlib/DotZLib/AssemblyInfo.cs
deleted file mode 100644
index 724c5347f..000000000
--- a/src/png/zlib/contrib/dotzlib/DotZLib/AssemblyInfo.cs
+++ /dev/null
@@ -1,58 +0,0 @@
-using System.Reflection;
-using System.Runtime.CompilerServices;
-
-//
-// General Information about an assembly is controlled through the following
-// set of attributes. Change these attribute values to modify the information
-// associated with an assembly.
-//
-[assembly: AssemblyTitle("DotZLib")]
-[assembly: AssemblyDescription(".Net bindings for ZLib compression dll 1.2.x")]
-[assembly: AssemblyConfiguration("")]
-[assembly: AssemblyCompany("Henrik Ravn")]
-[assembly: AssemblyProduct("")]
-[assembly: AssemblyCopyright("(c) 2004 by Henrik Ravn")]
-[assembly: AssemblyTrademark("")]
-[assembly: AssemblyCulture("")]
-
-//
-// Version information for an assembly consists of the following four values:
-//
-//      Major Version
-//      Minor Version
-//      Build Number
-//      Revision
-//
-// You can specify all the values or you can default the Revision and Build Numbers
-// by using the '*' as shown below:
-
-[assembly: AssemblyVersion("1.0.*")]
-
-//
-// In order to sign your assembly you must specify a key to use. Refer to the
-// Microsoft .NET Framework documentation for more information on assembly signing.
-//
-// Use the attributes below to control which key is used for signing.
-//
-// Notes:
-//   (*) If no key is specified, the assembly is not signed.
-//   (*) KeyName refers to a key that has been installed in the Crypto Service
-//       Provider (CSP) on your machine. KeyFile refers to a file which contains
-//       a key.
-//   (*) If the KeyFile and the KeyName values are both specified, the
-//       following processing occurs:
-//       (1) If the KeyName can be found in the CSP, that key is used.
-//       (2) If the KeyName does not exist and the KeyFile does exist, the key
-//           in the KeyFile is installed into the CSP and used.
-//   (*) In order to create a KeyFile, you can use the sn.exe (Strong Name) utility.
-//       When specifying the KeyFile, the location of the KeyFile should be
-//       relative to the project output directory which is
-//       %Project Directory%\obj\<configuration>. For example, if your KeyFile is
-//       located in the project directory, you would specify the AssemblyKeyFile
-//       attribute as [assembly: AssemblyKeyFile("..\\..\\mykey.snk")]
-//   (*) Delay Signing is an advanced option - see the Microsoft .NET Framework
-//       documentation for more information on this.
-//
-[assembly: AssemblyDelaySign(false)]
-[assembly: AssemblyKeyFile("")]
-[assembly: AssemblyKeyName("")]
diff --git a/src/png/zlib/contrib/dotzlib/DotZLib/ChecksumImpl.cs b/src/png/zlib/contrib/dotzlib/DotZLib/ChecksumImpl.cs
deleted file mode 100644
index b110dae6a..000000000
--- a/src/png/zlib/contrib/dotzlib/DotZLib/ChecksumImpl.cs
+++ /dev/null
@@ -1,202 +0,0 @@
-//
-// © Copyright Henrik Ravn 2004
-//
-// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-using System;
-using System.Runtime.InteropServices;
-using System.Text;
-
-
-namespace DotZLib
-{
-    #region ChecksumGeneratorBase
-    /// <summary>
-    /// Implements the common functionality needed for all <see cref="ChecksumGenerator"/>s
-    /// </summary>
-    /// <example></example>
-    public abstract class ChecksumGeneratorBase : ChecksumGenerator
-    {
-        /// <summary>
-        /// The value of the current checksum
-        /// </summary>
-        protected uint _current;
-
-        /// <summary>
-        /// Initializes a new instance of the checksum generator base - the current checksum is
-        /// set to zero
-        /// </summary>
-        public ChecksumGeneratorBase()
-        {
-            _current = 0;
-        }
-
-        /// <summary>
-        /// Initializes a new instance of the checksum generator basewith a specified value
-        /// </summary>
-        /// <param name="initialValue">The value to set the current checksum to</param>
-        public ChecksumGeneratorBase(uint initialValue)
-        {
-            _current = initialValue;
-        }
-
-        /// <summary>
-        /// Resets the current checksum to zero
-        /// </summary>
-        public void Reset() { _current = 0; }
-
-        /// <summary>
-        /// Gets the current checksum value
-        /// </summary>
-        public uint Value { get { return _current; } }
-
-        /// <summary>
-        /// Updates the current checksum with part of an array of bytes
-        /// </summary>
-        /// <param name="data">The data to update the checksum with</param>
-        /// <param name="offset">Where in <c>data</c> to start updating</param>
-        /// <param name="count">The number of bytes from <c>data</c> to use</param>
-        /// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>
-        /// <exception cref="NullReferenceException"><c>data</c> is a null reference</exception>
-        /// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>
-        /// <remarks>All the other <c>Update</c> methods are implmeneted in terms of this one.
-        /// This is therefore the only method a derived class has to implement</remarks>
-        public abstract void Update(byte[] data, int offset, int count);
-
-        /// <summary>
-        /// Updates the current checksum with an array of bytes.
-        /// </summary>
-        /// <param name="data">The data to update the checksum with</param>
-        public void Update(byte[] data)
-        {
-            Update(data, 0, data.Length);
-        }
-
-        /// <summary>
-        /// Updates the current checksum with the data from a string
-        /// </summary>
-        /// <param name="data">The string to update the checksum with</param>
-        /// <remarks>The characters in the string are converted by the UTF-8 encoding</remarks>
-        public void Update(string data)
-        {
-			Update(Encoding.UTF8.GetBytes(data));
-        }
-
-        /// <summary>
-        /// Updates the current checksum with the data from a string, using a specific encoding
-        /// </summary>
-        /// <param name="data">The string to update the checksum with</param>
-        /// <param name="encoding">The encoding to use</param>
-        public void Update(string data, Encoding encoding)
-        {
-            Update(encoding.GetBytes(data));
-        }
-
-    }
-    #endregion
-
-    #region CRC32
-    /// <summary>
-    /// Implements a CRC32 checksum generator
-    /// </summary>
-    public sealed class CRC32Checksum : ChecksumGeneratorBase
-    {
-        #region DLL imports
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern uint crc32(uint crc, int data, uint length);
-
-        #endregion
-
-        /// <summary>
-        /// Initializes a new instance of the CRC32 checksum generator
-        /// </summary>
-        public CRC32Checksum() : base() {}
-
-        /// <summary>
-        /// Initializes a new instance of the CRC32 checksum generator with a specified value
-        /// </summary>
-        /// <param name="initialValue">The value to set the current checksum to</param>
-        public CRC32Checksum(uint initialValue) : base(initialValue) {}
-
-        /// <summary>
-        /// Updates the current checksum with part of an array of bytes
-        /// </summary>
-        /// <param name="data">The data to update the checksum with</param>
-        /// <param name="offset">Where in <c>data</c> to start updating</param>
-        /// <param name="count">The number of bytes from <c>data</c> to use</param>
-        /// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>
-        /// <exception cref="NullReferenceException"><c>data</c> is a null reference</exception>
-        /// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>
-        public override void Update(byte[] data, int offset, int count)
-        {
-            if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
-            if ((offset+count) > data.Length) throw new ArgumentException();
-            GCHandle hData = GCHandle.Alloc(data, GCHandleType.Pinned);
-            try
-            {
-                _current = crc32(_current, hData.AddrOfPinnedObject().ToInt32()+offset, (uint)count);
-            }
-            finally
-            {
-                hData.Free();
-            }
-        }
-
-    }
-    #endregion
-
-    #region Adler
-    /// <summary>
-    /// Implements a checksum generator that computes the Adler checksum on data
-    /// </summary>
-    public sealed class AdlerChecksum : ChecksumGeneratorBase
-    {
-        #region DLL imports
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern uint adler32(uint adler, int data, uint length);
-
-        #endregion
-
-        /// <summary>
-        /// Initializes a new instance of the Adler checksum generator
-        /// </summary>
-        public AdlerChecksum() : base() {}
-
-        /// <summary>
-        /// Initializes a new instance of the Adler checksum generator with a specified value
-        /// </summary>
-        /// <param name="initialValue">The value to set the current checksum to</param>
-        public AdlerChecksum(uint initialValue) : base(initialValue) {}
-
-        /// <summary>
-        /// Updates the current checksum with part of an array of bytes
-        /// </summary>
-        /// <param name="data">The data to update the checksum with</param>
-        /// <param name="offset">Where in <c>data</c> to start updating</param>
-        /// <param name="count">The number of bytes from <c>data</c> to use</param>
-        /// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>
-        /// <exception cref="NullReferenceException"><c>data</c> is a null reference</exception>
-        /// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>
-        public override void Update(byte[] data, int offset, int count)
-        {
-            if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
-            if ((offset+count) > data.Length) throw new ArgumentException();
-            GCHandle hData = GCHandle.Alloc(data, GCHandleType.Pinned);
-            try
-            {
-                _current = adler32(_current, hData.AddrOfPinnedObject().ToInt32()+offset, (uint)count);
-            }
-            finally
-            {
-                hData.Free();
-            }
-        }
-
-    }
-    #endregion
-
-}
\ No newline at end of file
diff --git a/src/png/zlib/contrib/dotzlib/DotZLib/CircularBuffer.cs b/src/png/zlib/contrib/dotzlib/DotZLib/CircularBuffer.cs
deleted file mode 100644
index 9c8d60195..000000000
--- a/src/png/zlib/contrib/dotzlib/DotZLib/CircularBuffer.cs
+++ /dev/null
@@ -1,83 +0,0 @@
-//
-// © Copyright Henrik Ravn 2004
-//
-// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-using System;
-using System.Diagnostics;
-
-namespace DotZLib
-{
-
-	/// <summary>
-	/// This class implements a circular buffer
-	/// </summary>
-	internal class CircularBuffer
-	{
-        #region Private data
-        private int _capacity;
-        private int _head;
-        private int _tail;
-        private int _size;
-        private byte[] _buffer;
-        #endregion
-
-        public CircularBuffer(int capacity)
-        {
-            Debug.Assert( capacity > 0 );
-            _buffer = new byte[capacity];
-            _capacity = capacity;
-            _head = 0;
-            _tail = 0;
-            _size = 0;
-        }
-
-        public int Size { get { return _size; } }
-
-        public int Put(byte[] source, int offset, int count)
-        {
-            Debug.Assert( count > 0 );
-            int trueCount = Math.Min(count, _capacity - Size);
-            for (int i = 0; i < trueCount; ++i)
-                _buffer[(_tail+i) % _capacity] = source[offset+i];
-            _tail += trueCount;
-            _tail %= _capacity;
-            _size += trueCount;
-            return trueCount;
-        }
-
-        public bool Put(byte b)
-        {
-            if (Size == _capacity) // no room
-                return false;
-            _buffer[_tail++] = b;
-            _tail %= _capacity;
-            ++_size;
-            return true;
-        }
-
-        public int Get(byte[] destination, int offset, int count)
-        {
-            int trueCount = Math.Min(count,Size);
-            for (int i = 0; i < trueCount; ++i)
-                destination[offset + i] = _buffer[(_head+i) % _capacity];
-            _head += trueCount;
-            _head %= _capacity;
-            _size -= trueCount;
-            return trueCount;
-        }
-
-        public int Get()
-        {
-            if (Size == 0)
-                return -1;
-
-            int result = (int)_buffer[_head++ % _capacity];
-            --_size;
-            return result;
-        }
-
-    }
-}
diff --git a/src/png/zlib/contrib/dotzlib/DotZLib/CodecBase.cs b/src/png/zlib/contrib/dotzlib/DotZLib/CodecBase.cs
deleted file mode 100644
index b0eb78a02..000000000
--- a/src/png/zlib/contrib/dotzlib/DotZLib/CodecBase.cs
+++ /dev/null
@@ -1,198 +0,0 @@
-//
-// © Copyright Henrik Ravn 2004
-//
-// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-using System;
-using System.Runtime.InteropServices;
-
-namespace DotZLib
-{
-	/// <summary>
-	/// Implements the common functionality needed for all <see cref="Codec"/>s
-	/// </summary>
-	public abstract class CodecBase : Codec, IDisposable
-	{
-
-        #region Data members
-
-        /// <summary>
-        /// Instance of the internal zlib buffer structure that is
-        /// passed to all functions in the zlib dll
-        /// </summary>
-        internal ZStream _ztream = new ZStream();
-
-        /// <summary>
-        /// True if the object instance has been disposed, false otherwise
-        /// </summary>
-        protected bool _isDisposed = false;
-
-        /// <summary>
-        /// The size of the internal buffers
-        /// </summary>
-        protected const int kBufferSize = 16384;
-
-        private byte[] _outBuffer = new byte[kBufferSize];
-        private byte[] _inBuffer = new byte[kBufferSize];
-
-        private GCHandle _hInput;
-        private GCHandle _hOutput;
-
-        private uint _checksum = 0;
-
-        #endregion
-
-        /// <summary>
-        /// Initializes a new instance of the <c>CodeBase</c> class.
-        /// </summary>
-		public CodecBase()
-		{
-            try
-            {
-                _hInput = GCHandle.Alloc(_inBuffer, GCHandleType.Pinned);
-                _hOutput = GCHandle.Alloc(_outBuffer, GCHandleType.Pinned);
-            }
-            catch (Exception)
-            {
-                CleanUp(false);
-                throw;
-            }
-        }
-
-
-        #region Codec Members
-
-        /// <summary>
-        /// Occurs when more processed data are available.
-        /// </summary>
-        public event DataAvailableHandler DataAvailable;
-
-        /// <summary>
-        /// Fires the <see cref="DataAvailable"/> event
-        /// </summary>
-        protected void OnDataAvailable()
-        {
-            if (_ztream.total_out > 0)
-            {
-                if (DataAvailable != null)
-                    DataAvailable( _outBuffer, 0, (int)_ztream.total_out);
-                resetOutput();
-            }
-        }
-
-        /// <summary>
-        /// Adds more data to the codec to be processed.
-        /// </summary>
-        /// <param name="data">Byte array containing the data to be added to the codec</param>
-        /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
-        public void Add(byte[] data)
-        {
-            Add(data,0,data.Length);
-        }
-
-        /// <summary>
-        /// Adds more data to the codec to be processed.
-        /// </summary>
-        /// <param name="data">Byte array containing the data to be added to the codec</param>
-        /// <param name="offset">The index of the first byte to add from <c>data</c></param>
-        /// <param name="count">The number of bytes to add</param>
-        /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
-        /// <remarks>This must be implemented by a derived class</remarks>
-        public abstract void Add(byte[] data, int offset, int count);
-
-        /// <summary>
-        /// Finishes up any pending data that needs to be processed and handled.
-        /// </summary>
-        /// <remarks>This must be implemented by a derived class</remarks>
-        public abstract void Finish();
-
-        /// <summary>
-        /// Gets the checksum of the data that has been added so far
-        /// </summary>
-        public uint Checksum { get { return _checksum; } }
-
-        #endregion
-
-        #region Destructor & IDisposable stuff
-
-        /// <summary>
-        /// Destroys this instance
-        /// </summary>
-        ~CodecBase()
-        {
-            CleanUp(false);
-        }
-
-        /// <summary>
-        /// Releases any unmanaged resources and calls the <see cref="CleanUp()"/> method of the derived class
-        /// </summary>
-        public void Dispose()
-        {
-            CleanUp(true);
-        }
-
-        /// <summary>
-        /// Performs any codec specific cleanup
-        /// </summary>
-        /// <remarks>This must be implemented by a derived class</remarks>
-        protected abstract void CleanUp();
-
-        // performs the release of the handles and calls the dereived CleanUp()
-        private void CleanUp(bool isDisposing)
-        {
-            if (!_isDisposed)
-            {
-                CleanUp();
-                if (_hInput.IsAllocated)
-                    _hInput.Free();
-                if (_hOutput.IsAllocated)
-                    _hOutput.Free();
-
-                _isDisposed = true;
-            }
-        }
-
-
-        #endregion
-
-        #region Helper methods
-
-        /// <summary>
-        /// Copies a number of bytes to the internal codec buffer - ready for proccesing
-        /// </summary>
-        /// <param name="data">The byte array that contains the data to copy</param>
-        /// <param name="startIndex">The index of the first byte to copy</param>
-        /// <param name="count">The number of bytes to copy from <c>data</c></param>
-        protected void copyInput(byte[] data, int startIndex, int count)
-        {
-            Array.Copy(data, startIndex, _inBuffer,0, count);
-            _ztream.next_in = _hInput.AddrOfPinnedObject();
-            _ztream.total_in = 0;
-            _ztream.avail_in = (uint)count;
-
-        }
-
-        /// <summary>
-        /// Resets the internal output buffers to a known state - ready for processing
-        /// </summary>
-        protected void resetOutput()
-        {
-            _ztream.total_out = 0;
-            _ztream.avail_out = kBufferSize;
-            _ztream.next_out = _hOutput.AddrOfPinnedObject();
-        }
-
-        /// <summary>
-        /// Updates the running checksum property
-        /// </summary>
-        /// <param name="newSum">The new checksum value</param>
-        protected void setChecksum(uint newSum)
-        {
-            _checksum = newSum;
-        }
-        #endregion
-
-    }
-}
diff --git a/src/png/zlib/contrib/dotzlib/DotZLib/Deflater.cs b/src/png/zlib/contrib/dotzlib/DotZLib/Deflater.cs
deleted file mode 100644
index 9039f41f6..000000000
--- a/src/png/zlib/contrib/dotzlib/DotZLib/Deflater.cs
+++ /dev/null
@@ -1,106 +0,0 @@
-//
-// © Copyright Henrik Ravn 2004
-//
-// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-using System;
-using System.Diagnostics;
-using System.Runtime.InteropServices;
-
-namespace DotZLib
-{
-
-    /// <summary>
-    /// Implements a data compressor, using the deflate algorithm in the ZLib dll
-    /// </summary>
-	public sealed class Deflater : CodecBase
-	{
-        #region Dll imports
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)]
-        private static extern int deflateInit_(ref ZStream sz, int level, string vs, int size);
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern int deflate(ref ZStream sz, int flush);
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern int deflateReset(ref ZStream sz);
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern int deflateEnd(ref ZStream sz);
-        #endregion
-
-        /// <summary>
-        /// Constructs an new instance of the <c>Deflater</c>
-        /// </summary>
-        /// <param name="level">The compression level to use for this <c>Deflater</c></param>
-		public Deflater(CompressLevel level) : base()
-		{
-            int retval = deflateInit_(ref _ztream, (int)level, Info.Version, Marshal.SizeOf(_ztream));
-            if (retval != 0)
-                throw new ZLibException(retval, "Could not initialize deflater");
-
-            resetOutput();
-		}
-
-        /// <summary>
-        /// Adds more data to the codec to be processed.
-        /// </summary>
-        /// <param name="data">Byte array containing the data to be added to the codec</param>
-        /// <param name="offset">The index of the first byte to add from <c>data</c></param>
-        /// <param name="count">The number of bytes to add</param>
-        /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
-        public override void Add(byte[] data, int offset, int count)
-        {
-            if (data == null) throw new ArgumentNullException();
-            if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
-            if ((offset+count) > data.Length) throw new ArgumentException();
-
-            int total = count;
-            int inputIndex = offset;
-            int err = 0;
-
-            while (err >= 0 && inputIndex < total)
-            {
-                copyInput(data, inputIndex, Math.Min(total - inputIndex, kBufferSize));
-                while (err >= 0 && _ztream.avail_in > 0)
-                {
-                    err = deflate(ref _ztream, (int)FlushTypes.None);
-                    if (err == 0)
-                        while (_ztream.avail_out == 0)
-                        {
-                            OnDataAvailable();
-                            err = deflate(ref _ztream, (int)FlushTypes.None);
-                        }
-                    inputIndex += (int)_ztream.total_in;
-                }
-            }
-            setChecksum( _ztream.adler );
-        }
-
-
-        /// <summary>
-        /// Finishes up any pending data that needs to be processed and handled.
-        /// </summary>
-        public override void Finish()
-        {
-            int err;
-            do
-            {
-                err = deflate(ref _ztream, (int)FlushTypes.Finish);
-                OnDataAvailable();
-            }
-            while (err == 0);
-            setChecksum( _ztream.adler );
-            deflateReset(ref _ztream);
-            resetOutput();
-        }
-
-        /// <summary>
-        /// Closes the internal zlib deflate stream
-        /// </summary>
-        protected override void CleanUp() { deflateEnd(ref _ztream); }
-
-    }
-}
diff --git a/src/png/zlib/contrib/dotzlib/DotZLib/DotZLib.cs b/src/png/zlib/contrib/dotzlib/DotZLib/DotZLib.cs
deleted file mode 100644
index 90c7c3b38..000000000
--- a/src/png/zlib/contrib/dotzlib/DotZLib/DotZLib.cs
+++ /dev/null
@@ -1,288 +0,0 @@
-//
-// © Copyright Henrik Ravn 2004
-//
-// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-using System;
-using System.IO;
-using System.Runtime.InteropServices;
-using System.Text;
-
-
-namespace DotZLib
-{
-
-    #region Internal types
-
-    /// <summary>
-    /// Defines constants for the various flush types used with zlib
-    /// </summary>
-    internal enum FlushTypes
-    {
-        None,  Partial,  Sync,  Full,  Finish,  Block
-    }
-
-    #region ZStream structure
-    // internal mapping of the zlib zstream structure for marshalling
-    [StructLayoutAttribute(LayoutKind.Sequential, Pack=4, Size=0, CharSet=CharSet.Ansi)]
-    internal struct ZStream
-    {
-        public IntPtr next_in;
-        public uint avail_in;
-        public uint total_in;
-
-        public IntPtr next_out;
-        public uint avail_out;
-        public uint total_out;
-
-        [MarshalAs(UnmanagedType.LPStr)]
-        string msg;
-        uint state;
-
-        uint zalloc;
-        uint zfree;
-        uint opaque;
-
-        int data_type;
-        public uint adler;
-        uint reserved;
-    }
-
-    #endregion
-
-    #endregion
-
-    #region Public enums
-    /// <summary>
-    /// Defines constants for the available compression levels in zlib
-    /// </summary>
-    public enum CompressLevel : int
-    {
-        /// <summary>
-        /// The default compression level with a reasonable compromise between compression and speed
-        /// </summary>
-        Default = -1,
-        /// <summary>
-        /// No compression at all. The data are passed straight through.
-        /// </summary>
-        None = 0,
-        /// <summary>
-        /// The maximum compression rate available.
-        /// </summary>
-        Best = 9,
-        /// <summary>
-        /// The fastest available compression level.
-        /// </summary>
-        Fastest = 1
-    }
-    #endregion
-
-    #region Exception classes
-    /// <summary>
-    /// The exception that is thrown when an error occurs on the zlib dll
-    /// </summary>
-    public class ZLibException : ApplicationException
-    {
-        /// <summary>
-        /// Initializes a new instance of the <see cref="ZLibException"/> class with a specified
-        /// error message and error code
-        /// </summary>
-        /// <param name="errorCode">The zlib error code that caused the exception</param>
-        /// <param name="msg">A message that (hopefully) describes the error</param>
-        public ZLibException(int errorCode, string msg) : base(String.Format("ZLib error {0} {1}", errorCode, msg))
-        {
-        }
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="ZLibException"/> class with a specified
-        /// error code
-        /// </summary>
-        /// <param name="errorCode">The zlib error code that caused the exception</param>
-        public ZLibException(int errorCode) : base(String.Format("ZLib error {0}", errorCode))
-        {
-        }
-    }
-    #endregion
-
-    #region Interfaces
-
-    /// <summary>
-    /// Declares methods and properties that enables a running checksum to be calculated
-    /// </summary>
-    public interface ChecksumGenerator
-    {
-        /// <summary>
-        /// Gets the current value of the checksum
-        /// </summary>
-        uint Value { get; }
-
-        /// <summary>
-        /// Clears the current checksum to 0
-        /// </summary>
-        void Reset();
-
-        /// <summary>
-        /// Updates the current checksum with an array of bytes
-        /// </summary>
-        /// <param name="data">The data to update the checksum with</param>
-        void Update(byte[] data);
-
-        /// <summary>
-        /// Updates the current checksum with part of an array of bytes
-        /// </summary>
-        /// <param name="data">The data to update the checksum with</param>
-        /// <param name="offset">Where in <c>data</c> to start updating</param>
-        /// <param name="count">The number of bytes from <c>data</c> to use</param>
-        /// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>
-        /// <exception cref="ArgumentNullException"><c>data</c> is a null reference</exception>
-        /// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>
-        void Update(byte[] data, int offset, int count);
-
-        /// <summary>
-        /// Updates the current checksum with the data from a string
-        /// </summary>
-        /// <param name="data">The string to update the checksum with</param>
-        /// <remarks>The characters in the string are converted by the UTF-8 encoding</remarks>
-        void Update(string data);
-
-        /// <summary>
-        /// Updates the current checksum with the data from a string, using a specific encoding
-        /// </summary>
-        /// <param name="data">The string to update the checksum with</param>
-        /// <param name="encoding">The encoding to use</param>
-        void Update(string data, Encoding encoding);
-    }
-
-
-    /// <summary>
-    /// Represents the method that will be called from a codec when new data
-    /// are available.
-    /// </summary>
-    /// <paramref name="data">The byte array containing the processed data</paramref>
-    /// <paramref name="startIndex">The index of the first processed byte in <c>data</c></paramref>
-    /// <paramref name="count">The number of processed bytes available</paramref>
-    /// <remarks>On return from this method, the data may be overwritten, so grab it while you can.
-    /// You cannot assume that startIndex will be zero.
-    /// </remarks>
-    public delegate void DataAvailableHandler(byte[] data, int startIndex, int count);
-
-    /// <summary>
-    /// Declares methods and events for implementing compressors/decompressors
-    /// </summary>
-    public interface Codec
-    {
-        /// <summary>
-        /// Occurs when more processed data are available.
-        /// </summary>
-        event DataAvailableHandler DataAvailable;
-
-        /// <summary>
-        /// Adds more data to the codec to be processed.
-        /// </summary>
-        /// <param name="data">Byte array containing the data to be added to the codec</param>
-        /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
-        void Add(byte[] data);
-
-        /// <summary>
-        /// Adds more data to the codec to be processed.
-        /// </summary>
-        /// <param name="data">Byte array containing the data to be added to the codec</param>
-        /// <param name="offset">The index of the first byte to add from <c>data</c></param>
-        /// <param name="count">The number of bytes to add</param>
-        /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
-        void Add(byte[] data, int offset, int count);
-
-        /// <summary>
-        /// Finishes up any pending data that needs to be processed and handled.
-        /// </summary>
-        void Finish();
-
-        /// <summary>
-        /// Gets the checksum of the data that has been added so far
-        /// </summary>
-        uint Checksum { get; }
-
-
-    }
-
-    #endregion
-
-    #region Classes
-    /// <summary>
-    /// Encapsulates general information about the ZLib library
-    /// </summary>
-    public class Info
-    {
-        #region DLL imports
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern uint zlibCompileFlags();
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern string zlibVersion();
-        #endregion
-
-        #region Private stuff
-        private uint _flags;
-
-        // helper function that unpacks a bitsize mask
-        private static int bitSize(uint bits)
-        {
-            switch (bits)
-            {
-                case 0: return 16;
-                case 1: return 32;
-                case 2: return 64;
-            }
-            return -1;
-        }
-        #endregion
-
-        /// <summary>
-        /// Constructs an instance of the <c>Info</c> class.
-        /// </summary>
-        public Info()
-        {
-            _flags = zlibCompileFlags();
-        }
-
-        /// <summary>
-        /// True if the library is compiled with debug info
-        /// </summary>
-        public bool HasDebugInfo { get { return 0 != (_flags & 0x100); } }
-
-        /// <summary>
-        /// True if the library is compiled with assembly optimizations
-        /// </summary>
-        public bool UsesAssemblyCode { get { return 0 != (_flags & 0x200); } }
-
-        /// <summary>
-        /// Gets the size of the unsigned int that was compiled into Zlib
-        /// </summary>
-        public int SizeOfUInt { get { return bitSize(_flags & 3); } }
-
-        /// <summary>
-        /// Gets the size of the unsigned long that was compiled into Zlib
-        /// </summary>
-        public int SizeOfULong { get { return bitSize((_flags >> 2) & 3); } }
-
-        /// <summary>
-        /// Gets the size of the pointers that were compiled into Zlib
-        /// </summary>
-        public int SizeOfPointer { get { return bitSize((_flags >> 4) & 3); } }
-
-        /// <summary>
-        /// Gets the size of the z_off_t type that was compiled into Zlib
-        /// </summary>
-        public int SizeOfOffset { get { return bitSize((_flags >> 6) & 3); } }
-
-        /// <summary>
-        /// Gets the version of ZLib as a string, e.g. "1.2.1"
-        /// </summary>
-        public static string Version { get { return zlibVersion(); } }
-    }
-
-    #endregion
-
-}
diff --git a/src/png/zlib/contrib/dotzlib/DotZLib/DotZLib.csproj b/src/png/zlib/contrib/dotzlib/DotZLib/DotZLib.csproj
deleted file mode 100644
index dea7fb16a..000000000
--- a/src/png/zlib/contrib/dotzlib/DotZLib/DotZLib.csproj
+++ /dev/null
@@ -1,141 +0,0 @@
-<VisualStudioProject>
-    <CSHARP
-        ProjectType = "Local"
-        ProductVersion = "7.10.3077"
-        SchemaVersion = "2.0"
-        ProjectGuid = "{BB1EE0B1-1808-46CB-B786-949D91117FC5}"
-    >
-        <Build>
-            <Settings
-                ApplicationIcon = ""
-                AssemblyKeyContainerName = ""
-                AssemblyName = "DotZLib"
-                AssemblyOriginatorKeyFile = ""
-                DefaultClientScript = "JScript"
-                DefaultHTMLPageLayout = "Grid"
-                DefaultTargetSchema = "IE50"
-                DelaySign = "false"
-                OutputType = "Library"
-                PreBuildEvent = ""
-                PostBuildEvent = ""
-                RootNamespace = "DotZLib"
-                RunPostBuildEvent = "OnBuildSuccess"
-                StartupObject = ""
-            >
-                <Config
-                    Name = "Debug"
-                    AllowUnsafeBlocks = "false"
-                    BaseAddress = "285212672"
-                    CheckForOverflowUnderflow = "false"
-                    ConfigurationOverrideFile = ""
-                    DefineConstants = "DEBUG;TRACE"
-                    DocumentationFile = "docs\DotZLib.xml"
-                    DebugSymbols = "true"
-                    FileAlignment = "4096"
-                    IncrementalBuild = "false"
-                    NoStdLib = "false"
-                    NoWarn = "1591"
-                    Optimize = "false"
-                    OutputPath = "bin\Debug\"
-                    RegisterForComInterop = "false"
-                    RemoveIntegerChecks = "false"
-                    TreatWarningsAsErrors = "false"
-                    WarningLevel = "4"
-                />
-                <Config
-                    Name = "Release"
-                    AllowUnsafeBlocks = "false"
-                    BaseAddress = "285212672"
-                    CheckForOverflowUnderflow = "false"
-                    ConfigurationOverrideFile = ""
-                    DefineConstants = "TRACE"
-                    DocumentationFile = "docs\DotZLib.xml"
-                    DebugSymbols = "false"
-                    FileAlignment = "4096"
-                    IncrementalBuild = "false"
-                    NoStdLib = "false"
-                    NoWarn = ""
-                    Optimize = "true"
-                    OutputPath = "bin\Release\"
-                    RegisterForComInterop = "false"
-                    RemoveIntegerChecks = "false"
-                    TreatWarningsAsErrors = "false"
-                    WarningLevel = "4"
-                />
-            </Settings>
-            <References>
-                <Reference
-                    Name = "System"
-                    AssemblyName = "System"
-                    HintPath = "C:\WINNT\Microsoft.NET\Framework\v1.1.4322\System.dll"
-                />
-                <Reference
-                    Name = "System.Data"
-                    AssemblyName = "System.Data"
-                    HintPath = "C:\WINNT\Microsoft.NET\Framework\v1.1.4322\System.Data.dll"
-                />
-                <Reference
-                    Name = "System.XML"
-                    AssemblyName = "System.Xml"
-                    HintPath = "C:\WINNT\Microsoft.NET\Framework\v1.1.4322\System.XML.dll"
-                />
-                <Reference
-                    Name = "nunit.framework"
-                    AssemblyName = "nunit.framework"
-                    HintPath = "E:\apps\NUnit V2.1\\bin\nunit.framework.dll"
-                    AssemblyFolderKey = "hklm\dn\nunit.framework"
-                />
-            </References>
-        </Build>
-        <Files>
-            <Include>
-                <File
-                    RelPath = "AssemblyInfo.cs"
-                    SubType = "Code"
-                    BuildAction = "Compile"
-                />
-                <File
-                    RelPath = "ChecksumImpl.cs"
-                    SubType = "Code"
-                    BuildAction = "Compile"
-                />
-                <File
-                    RelPath = "CircularBuffer.cs"
-                    SubType = "Code"
-                    BuildAction = "Compile"
-                />
-                <File
-                    RelPath = "CodecBase.cs"
-                    SubType = "Code"
-                    BuildAction = "Compile"
-                />
-                <File
-                    RelPath = "Deflater.cs"
-                    SubType = "Code"
-                    BuildAction = "Compile"
-                />
-                <File
-                    RelPath = "DotZLib.cs"
-                    SubType = "Code"
-                    BuildAction = "Compile"
-                />
-                <File
-                    RelPath = "GZipStream.cs"
-                    SubType = "Code"
-                    BuildAction = "Compile"
-                />
-                <File
-                    RelPath = "Inflater.cs"
-                    SubType = "Code"
-                    BuildAction = "Compile"
-                />
-                <File
-                    RelPath = "UnitTests.cs"
-                    SubType = "Code"
-                    BuildAction = "Compile"
-                />
-            </Include>
-        </Files>
-    </CSHARP>
-</VisualStudioProject>
-
diff --git a/src/png/zlib/contrib/dotzlib/DotZLib/GZipStream.cs b/src/png/zlib/contrib/dotzlib/DotZLib/GZipStream.cs
deleted file mode 100644
index f0eada1d2..000000000
--- a/src/png/zlib/contrib/dotzlib/DotZLib/GZipStream.cs
+++ /dev/null
@@ -1,301 +0,0 @@
-//
-// © Copyright Henrik Ravn 2004
-//
-// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-using System;
-using System.IO;
-using System.Runtime.InteropServices;
-
-namespace DotZLib
-{
-	/// <summary>
-	/// Implements a compressed <see cref="Stream"/>, in GZip (.gz) format.
-	/// </summary>
-	public class GZipStream : Stream, IDisposable
-	{
-        #region Dll Imports
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)]
-        private static extern IntPtr gzopen(string name, string mode);
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern int gzclose(IntPtr gzFile);
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern int gzwrite(IntPtr gzFile, int data, int length);
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern int gzread(IntPtr gzFile, int data, int length);
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern int gzgetc(IntPtr gzFile);
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern int gzputc(IntPtr gzFile, int c);
-
-        #endregion
-
-        #region Private data
-        private IntPtr _gzFile;
-        private bool _isDisposed = false;
-        private bool _isWriting;
-        #endregion
-
-        #region Constructors
-        /// <summary>
-        /// Creates a new file as a writeable GZipStream
-        /// </summary>
-        /// <param name="fileName">The name of the compressed file to create</param>
-        /// <param name="level">The compression level to use when adding data</param>
-        /// <exception cref="ZLibException">If an error occurred in the internal zlib function</exception>
-		public GZipStream(string fileName, CompressLevel level)
-		{
-            _isWriting = true;
-            _gzFile = gzopen(fileName, String.Format("wb{0}", (int)level));
-            if (_gzFile == IntPtr.Zero)
-                throw new ZLibException(-1, "Could not open " + fileName);
-		}
-
-        /// <summary>
-        /// Opens an existing file as a readable GZipStream
-        /// </summary>
-        /// <param name="fileName">The name of the file to open</param>
-        /// <exception cref="ZLibException">If an error occurred in the internal zlib function</exception>
-        public GZipStream(string fileName)
-        {
-            _isWriting = false;
-            _gzFile = gzopen(fileName, "rb");
-            if (_gzFile == IntPtr.Zero)
-                throw new ZLibException(-1, "Could not open " + fileName);
-
-        }
-        #endregion
-
-        #region Access properties
-        /// <summary>
-        /// Returns true of this stream can be read from, false otherwise
-        /// </summary>
-        public override bool CanRead
-        {
-            get
-            {
-                return !_isWriting;
-            }
-        }
-
-
-        /// <summary>
-        /// Returns false.
-        /// </summary>
-        public override bool CanSeek
-        {
-            get
-            {
-                return false;
-            }
-        }
-
-        /// <summary>
-        /// Returns true if this tsream is writeable, false otherwise
-        /// </summary>
-        public override bool CanWrite
-        {
-            get
-            {
-                return _isWriting;
-            }
-        }
-        #endregion
-
-        #region Destructor & IDispose stuff
-
-        /// <summary>
-        /// Destroys this instance
-        /// </summary>
-        ~GZipStream()
-        {
-            cleanUp(false);
-        }
-
-        /// <summary>
-        /// Closes the external file handle
-        /// </summary>
-        public void Dispose()
-        {
-            cleanUp(true);
-        }
-
-        // Does the actual closing of the file handle.
-        private void cleanUp(bool isDisposing)
-        {
-            if (!_isDisposed)
-            {
-                gzclose(_gzFile);
-                _isDisposed = true;
-            }
-        }
-        #endregion
-
-        #region Basic reading and writing
-        /// <summary>
-        /// Attempts to read a number of bytes from the stream.
-        /// </summary>
-        /// <param name="buffer">The destination data buffer</param>
-        /// <param name="offset">The index of the first destination byte in <c>buffer</c></param>
-        /// <param name="count">The number of bytes requested</param>
-        /// <returns>The number of bytes read</returns>
-        /// <exception cref="ArgumentNullException">If <c>buffer</c> is null</exception>
-        /// <exception cref="ArgumentOutOfRangeException">If <c>count</c> or <c>offset</c> are negative</exception>
-        /// <exception cref="ArgumentException">If <c>offset</c>  + <c>count</c> is &gt; buffer.Length</exception>
-        /// <exception cref="NotSupportedException">If this stream is not readable.</exception>
-        /// <exception cref="ObjectDisposedException">If this stream has been disposed.</exception>
-        public override int Read(byte[] buffer, int offset, int count)
-        {
-            if (!CanRead) throw new NotSupportedException();
-            if (buffer == null) throw new ArgumentNullException();
-            if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
-            if ((offset+count) > buffer.Length) throw new ArgumentException();
-            if (_isDisposed) throw new ObjectDisposedException("GZipStream");
-
-            GCHandle h = GCHandle.Alloc(buffer, GCHandleType.Pinned);
-            int result;
-            try
-            {
-                result = gzread(_gzFile, h.AddrOfPinnedObject().ToInt32() + offset, count);
-                if (result < 0)
-                    throw new IOException();
-            }
-            finally
-            {
-                h.Free();
-            }
-            return result;
-        }
-
-        /// <summary>
-        /// Attempts to read a single byte from the stream.
-        /// </summary>
-        /// <returns>The byte that was read, or -1 in case of error or End-Of-File</returns>
-        public override int ReadByte()
-        {
-            if (!CanRead) throw new NotSupportedException();
-            if (_isDisposed) throw new ObjectDisposedException("GZipStream");
-            return gzgetc(_gzFile);
-        }
-
-        /// <summary>
-        /// Writes a number of bytes to the stream
-        /// </summary>
-        /// <param name="buffer"></param>
-        /// <param name="offset"></param>
-        /// <param name="count"></param>
-        /// <exception cref="ArgumentNullException">If <c>buffer</c> is null</exception>
-        /// <exception cref="ArgumentOutOfRangeException">If <c>count</c> or <c>offset</c> are negative</exception>
-        /// <exception cref="ArgumentException">If <c>offset</c>  + <c>count</c> is &gt; buffer.Length</exception>
-        /// <exception cref="NotSupportedException">If this stream is not writeable.</exception>
-        /// <exception cref="ObjectDisposedException">If this stream has been disposed.</exception>
-        public override void Write(byte[] buffer, int offset, int count)
-        {
-            if (!CanWrite) throw new NotSupportedException();
-            if (buffer == null) throw new ArgumentNullException();
-            if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
-            if ((offset+count) > buffer.Length) throw new ArgumentException();
-            if (_isDisposed) throw new ObjectDisposedException("GZipStream");
-
-            GCHandle h = GCHandle.Alloc(buffer, GCHandleType.Pinned);
-            try
-            {
-                int result = gzwrite(_gzFile, h.AddrOfPinnedObject().ToInt32() + offset, count);
-                if (result < 0)
-                    throw new IOException();
-            }
-            finally
-            {
-                h.Free();
-            }
-        }
-
-        /// <summary>
-        /// Writes a single byte to the stream
-        /// </summary>
-        /// <param name="value">The byte to add to the stream.</param>
-        /// <exception cref="NotSupportedException">If this stream is not writeable.</exception>
-        /// <exception cref="ObjectDisposedException">If this stream has been disposed.</exception>
-        public override void WriteByte(byte value)
-        {
-            if (!CanWrite) throw new NotSupportedException();
-            if (_isDisposed) throw new ObjectDisposedException("GZipStream");
-
-            int result = gzputc(_gzFile, (int)value);
-            if (result < 0)
-                throw new IOException();
-        }
-        #endregion
-
-        #region Position & length stuff
-        /// <summary>
-        /// Not supported.
-        /// </summary>
-        /// <param name="value"></param>
-        /// <exception cref="NotSupportedException">Always thrown</exception>
-        public override void SetLength(long value)
-        {
-            throw new NotSupportedException();
-        }
-
-        /// <summary>
-        ///  Not suppported.
-        /// </summary>
-        /// <param name="offset"></param>
-        /// <param name="origin"></param>
-        /// <returns></returns>
-        /// <exception cref="NotSupportedException">Always thrown</exception>
-        public override long Seek(long offset, SeekOrigin origin)
-        {
-            throw new NotSupportedException();
-        }
-
-        /// <summary>
-        /// Flushes the <c>GZipStream</c>.
-        /// </summary>
-        /// <remarks>In this implementation, this method does nothing. This is because excessive
-        /// flushing may degrade the achievable compression rates.</remarks>
-        public override void Flush()
-        {
-            // left empty on purpose
-        }
-
-        /// <summary>
-        /// Gets/sets the current position in the <c>GZipStream</c>. Not suppported.
-        /// </summary>
-        /// <remarks>In this implementation this property is not supported</remarks>
-        /// <exception cref="NotSupportedException">Always thrown</exception>
-        public override long Position
-        {
-            get
-            {
-                throw new NotSupportedException();
-            }
-            set
-            {
-                throw new NotSupportedException();
-            }
-        }
-
-        /// <summary>
-        /// Gets the size of the stream. Not suppported.
-        /// </summary>
-        /// <remarks>In this implementation this property is not supported</remarks>
-        /// <exception cref="NotSupportedException">Always thrown</exception>
-        public override long Length
-        {
-            get
-            {
-                throw new NotSupportedException();
-            }
-        }
-        #endregion
-    }
-}
diff --git a/src/png/zlib/contrib/dotzlib/DotZLib/Inflater.cs b/src/png/zlib/contrib/dotzlib/DotZLib/Inflater.cs
deleted file mode 100644
index d295f2680..000000000
--- a/src/png/zlib/contrib/dotzlib/DotZLib/Inflater.cs
+++ /dev/null
@@ -1,105 +0,0 @@
-//
-// © Copyright Henrik Ravn 2004
-//
-// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-using System;
-using System.Diagnostics;
-using System.Runtime.InteropServices;
-
-namespace DotZLib
-{
-
-    /// <summary>
-    /// Implements a data decompressor, using the inflate algorithm in the ZLib dll
-    /// </summary>
-    public class Inflater : CodecBase
-	{
-        #region Dll imports
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)]
-        private static extern int inflateInit_(ref ZStream sz, string vs, int size);
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern int inflate(ref ZStream sz, int flush);
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern int inflateReset(ref ZStream sz);
-
-        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
-        private static extern int inflateEnd(ref ZStream sz);
-        #endregion
-
-        /// <summary>
-        /// Constructs an new instance of the <c>Inflater</c>
-        /// </summary>
-        public Inflater() : base()
-		{
-            int retval = inflateInit_(ref _ztream, Info.Version, Marshal.SizeOf(_ztream));
-            if (retval != 0)
-                throw new ZLibException(retval, "Could not initialize inflater");
-
-            resetOutput();
-        }
-
-
-        /// <summary>
-        /// Adds more data to the codec to be processed.
-        /// </summary>
-        /// <param name="data">Byte array containing the data to be added to the codec</param>
-        /// <param name="offset">The index of the first byte to add from <c>data</c></param>
-        /// <param name="count">The number of bytes to add</param>
-        /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>
-        public override void Add(byte[] data, int offset, int count)
-        {
-            if (data == null) throw new ArgumentNullException();
-            if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
-            if ((offset+count) > data.Length) throw new ArgumentException();
-
-            int total = count;
-            int inputIndex = offset;
-            int err = 0;
-
-            while (err >= 0 && inputIndex < total)
-            {
-                copyInput(data, inputIndex, Math.Min(total - inputIndex, kBufferSize));
-                err = inflate(ref _ztream, (int)FlushTypes.None);
-                if (err == 0)
-                    while (_ztream.avail_out == 0)
-                    {
-                        OnDataAvailable();
-                        err = inflate(ref _ztream, (int)FlushTypes.None);
-                    }
-
-                inputIndex += (int)_ztream.total_in;
-            }
-            setChecksum( _ztream.adler );
-        }
-
-
-        /// <summary>
-        /// Finishes up any pending data that needs to be processed and handled.
-        /// </summary>
-        public override void Finish()
-        {
-            int err;
-            do
-            {
-                err = inflate(ref _ztream, (int)FlushTypes.Finish);
-                OnDataAvailable();
-            }
-            while (err == 0);
-            setChecksum( _ztream.adler );
-            inflateReset(ref _ztream);
-            resetOutput();
-        }
-
-        /// <summary>
-        /// Closes the internal zlib inflate stream
-        /// </summary>
-        protected override void CleanUp() { inflateEnd(ref _ztream); }
-
-
-	}
-}
diff --git a/src/png/zlib/contrib/dotzlib/DotZLib/UnitTests.cs b/src/png/zlib/contrib/dotzlib/DotZLib/UnitTests.cs
deleted file mode 100644
index 6d8aebb79..000000000
--- a/src/png/zlib/contrib/dotzlib/DotZLib/UnitTests.cs
+++ /dev/null
@@ -1,274 +0,0 @@
-//
-// © Copyright Henrik Ravn 2004
-//
-// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-using System;
-using System.Collections;
-using System.IO;
-
-// uncomment the define below to include unit tests
-//#define nunit
-#if nunit
-using NUnit.Framework;
-
-// Unit tests for the DotZLib class library
-// ----------------------------------------
-//
-// Use this with NUnit 2 from http://www.nunit.org
-//
-
-namespace DotZLibTests
-{
-    using DotZLib;
-
-    // helper methods
-    internal class Utils
-    {
-        public static bool byteArrEqual( byte[] lhs, byte[] rhs )
-        {
-            if (lhs.Length != rhs.Length)
-                return false;
-            for (int i = lhs.Length-1; i >= 0; --i)
-                if (lhs[i] != rhs[i])
-                    return false;
-            return true;
-        }
-
-    }
-
-
-    [TestFixture]
-    public class CircBufferTests
-    {
-        #region Circular buffer tests
-        [Test]
-        public void SinglePutGet()
-        {
-            CircularBuffer buf = new CircularBuffer(10);
-            Assert.AreEqual( 0, buf.Size );
-            Assert.AreEqual( -1, buf.Get() );
-
-            Assert.IsTrue(buf.Put( 1 ));
-            Assert.AreEqual( 1, buf.Size );
-            Assert.AreEqual( 1, buf.Get() );
-            Assert.AreEqual( 0, buf.Size );
-            Assert.AreEqual( -1, buf.Get() );
-        }
-
-        [Test]
-        public void BlockPutGet()
-        {
-            CircularBuffer buf = new CircularBuffer(10);
-            byte[] arr = {1,2,3,4,5,6,7,8,9,10};
-            Assert.AreEqual( 10, buf.Put(arr,0,10) );
-            Assert.AreEqual( 10, buf.Size );
-            Assert.IsFalse( buf.Put(11) );
-            Assert.AreEqual( 1, buf.Get() );
-            Assert.IsTrue( buf.Put(11) );
-
-            byte[] arr2 = (byte[])arr.Clone();
-            Assert.AreEqual( 9, buf.Get(arr2,1,9) );
-            Assert.IsTrue( Utils.byteArrEqual(arr,arr2) );
-        }
-
-        #endregion
-    }
-
-    [TestFixture]
-    public class ChecksumTests
-    {
-        #region CRC32 Tests
-        [Test]
-        public void CRC32_Null()
-        {
-            CRC32Checksum crc32 = new CRC32Checksum();
-            Assert.AreEqual( 0, crc32.Value );
-
-            crc32 = new CRC32Checksum(1);
-            Assert.AreEqual( 1, crc32.Value );
-
-            crc32 = new CRC32Checksum(556);
-            Assert.AreEqual( 556, crc32.Value );
-        }
-
-        [Test]
-        public void CRC32_Data()
-        {
-            CRC32Checksum crc32 = new CRC32Checksum();
-            byte[] data = { 1,2,3,4,5,6,7 };
-            crc32.Update(data);
-            Assert.AreEqual( 0x70e46888, crc32.Value  );
-
-            crc32 = new CRC32Checksum();
-            crc32.Update("penguin");
-            Assert.AreEqual( 0x0e5c1a120, crc32.Value );
-
-            crc32 = new CRC32Checksum(1);
-            crc32.Update("penguin");
-            Assert.AreEqual(0x43b6aa94, crc32.Value);
-
-        }
-        #endregion
-
-        #region Adler tests
-
-        [Test]
-        public void Adler_Null()
-        {
-            AdlerChecksum adler = new AdlerChecksum();
-            Assert.AreEqual(0, adler.Value);
-
-            adler = new AdlerChecksum(1);
-            Assert.AreEqual( 1, adler.Value );
-
-            adler = new AdlerChecksum(556);
-            Assert.AreEqual( 556, adler.Value );
-        }
-
-        [Test]
-        public void Adler_Data()
-        {
-            AdlerChecksum adler = new AdlerChecksum(1);
-            byte[] data = { 1,2,3,4,5,6,7 };
-            adler.Update(data);
-            Assert.AreEqual( 0x5b001d, adler.Value  );
-
-            adler = new AdlerChecksum();
-            adler.Update("penguin");
-            Assert.AreEqual(0x0bcf02f6, adler.Value );
-
-            adler = new AdlerChecksum(1);
-            adler.Update("penguin");
-            Assert.AreEqual(0x0bd602f7, adler.Value);
-
-        }
-        #endregion
-    }
-
-    [TestFixture]
-    public class InfoTests
-    {
-        #region Info tests
-        [Test]
-        public void Info_Version()
-        {
-            Info info = new Info();
-            Assert.AreEqual("1.2.11", Info.Version);
-            Assert.AreEqual(32, info.SizeOfUInt);
-            Assert.AreEqual(32, info.SizeOfULong);
-            Assert.AreEqual(32, info.SizeOfPointer);
-            Assert.AreEqual(32, info.SizeOfOffset);
-        }
-        #endregion
-    }
-
-    [TestFixture]
-    public class DeflateInflateTests
-    {
-        #region Deflate tests
-        [Test]
-        public void Deflate_Init()
-        {
-            using (Deflater def = new Deflater(CompressLevel.Default))
-            {
-            }
-        }
-
-        private ArrayList compressedData = new ArrayList();
-        private uint adler1;
-
-        private ArrayList uncompressedData = new ArrayList();
-        private uint adler2;
-
-        public void CDataAvail(byte[] data, int startIndex, int count)
-        {
-            for (int i = 0; i < count; ++i)
-                compressedData.Add(data[i+startIndex]);
-        }
-
-        [Test]
-        public void Deflate_Compress()
-        {
-            compressedData.Clear();
-
-            byte[] testData = new byte[35000];
-            for (int i = 0; i < testData.Length; ++i)
-                testData[i] = 5;
-
-            using (Deflater def = new Deflater((CompressLevel)5))
-            {
-                def.DataAvailable += new DataAvailableHandler(CDataAvail);
-                def.Add(testData);
-                def.Finish();
-                adler1 = def.Checksum;
-            }
-        }
-        #endregion
-
-        #region Inflate tests
-        [Test]
-        public void Inflate_Init()
-        {
-            using (Inflater inf = new Inflater())
-            {
-            }
-        }
-
-        private void DDataAvail(byte[] data, int startIndex, int count)
-        {
-            for (int i = 0; i < count; ++i)
-                uncompressedData.Add(data[i+startIndex]);
-        }
-
-        [Test]
-        public void Inflate_Expand()
-        {
-            uncompressedData.Clear();
-
-            using (Inflater inf = new Inflater())
-            {
-                inf.DataAvailable += new DataAvailableHandler(DDataAvail);
-                inf.Add((byte[])compressedData.ToArray(typeof(byte)));
-                inf.Finish();
-                adler2 = inf.Checksum;
-            }
-            Assert.AreEqual( adler1, adler2 );
-        }
-        #endregion
-    }
-
-    [TestFixture]
-    public class GZipStreamTests
-    {
-        #region GZipStream test
-        [Test]
-        public void GZipStream_WriteRead()
-        {
-            using (GZipStream gzOut = new GZipStream("gzstream.gz", CompressLevel.Best))
-            {
-                BinaryWriter writer = new BinaryWriter(gzOut);
-                writer.Write("hi there");
-                writer.Write(Math.PI);
-                writer.Write(42);
-            }
-
-            using (GZipStream gzIn = new GZipStream("gzstream.gz"))
-            {
-                BinaryReader reader = new BinaryReader(gzIn);
-                string s = reader.ReadString();
-                Assert.AreEqual("hi there",s);
-                double d = reader.ReadDouble();
-                Assert.AreEqual(Math.PI, d);
-                int i = reader.ReadInt32();
-                Assert.AreEqual(42,i);
-            }
-
-        }
-        #endregion
-	}
-}
-
-#endif
diff --git a/src/png/zlib/contrib/dotzlib/LICENSE_1_0.txt b/src/png/zlib/contrib/dotzlib/LICENSE_1_0.txt
deleted file mode 100644
index 127a5bc39..000000000
--- a/src/png/zlib/contrib/dotzlib/LICENSE_1_0.txt
+++ /dev/null
@@ -1,23 +0,0 @@
-Boost Software License - Version 1.0 - August 17th, 2003
-
-Permission is hereby granted, free of charge, to any person or organization
-obtaining a copy of the software and accompanying documentation covered by
-this license (the "Software") to use, reproduce, display, distribute,
-execute, and transmit the Software, and to prepare derivative works of the
-Software, and to permit third-parties to whom the Software is furnished to
-do so, all subject to the following:
-
-The copyright notices in the Software and this entire statement, including
-the above license grant, this restriction and the following disclaimer,
-must be included in all copies of the Software, in whole or in part, and
-all derivative works of the Software, unless such copies or derivative
-works are solely in the form of machine-executable object code generated by
-a source language processor.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
-SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
-FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
-ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-DEALINGS IN THE SOFTWARE.
\ No newline at end of file
diff --git a/src/png/zlib/contrib/dotzlib/readme.txt b/src/png/zlib/contrib/dotzlib/readme.txt
deleted file mode 100644
index 4d8c2dd93..000000000
--- a/src/png/zlib/contrib/dotzlib/readme.txt
+++ /dev/null
@@ -1,58 +0,0 @@
-This directory contains a .Net wrapper class library for the ZLib1.dll
-
-The wrapper includes support for inflating/deflating memory buffers,
-.Net streaming wrappers for the gz streams part of zlib, and wrappers
-for the checksum parts of zlib. See DotZLib/UnitTests.cs for examples.
-
-Directory structure:
---------------------
-
-LICENSE_1_0.txt       - License file.
-readme.txt            - This file.
-DotZLib.chm           - Class library documentation
-DotZLib.build         - NAnt build file
-DotZLib.sln           - Microsoft Visual Studio 2003 solution file
-
-DotZLib\*.cs          - Source files for the class library
-
-Unit tests:
------------
-The file DotZLib/UnitTests.cs contains unit tests for use with NUnit 2.1 or higher.
-To include unit tests in the build, define nunit before building.
-
-
-Build instructions:
--------------------
-
-1. Using Visual Studio.Net 2003:
-   Open DotZLib.sln in VS.Net and build from there. Output file (DotZLib.dll)
-   will be found ./DotZLib/bin/release or ./DotZLib/bin/debug, depending on
-   you are building the release or debug version of the library. Check
-   DotZLib/UnitTests.cs for instructions on how to include unit tests in the
-   build.
-
-2. Using NAnt:
-   Open a command prompt with access to the build environment and run nant
-   in the same directory as the DotZLib.build file.
-   You can define 2 properties on the nant command-line to control the build:
-   debug={true|false} to toggle between release/debug builds (default=true).
-   nunit={true|false} to include or esclude unit tests (default=true).
-   Also the target clean will remove binaries.
-   Output file (DotZLib.dll) will be found in either ./DotZLib/bin/release
-   or ./DotZLib/bin/debug, depending on whether you are building the release
-   or debug version of the library.
-
-   Examples:
-     nant -D:debug=false -D:nunit=false
-       will build a release mode version of the library without unit tests.
-     nant
-       will build a debug version of the library with unit tests
-     nant clean
-       will remove all previously built files.
-
-
----------------------------------
-Copyright (c) Henrik Ravn 2004
-
-Use, modification and distribution are subject to the Boost Software License, Version 1.0.
-(See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
diff --git a/src/png/zlib/contrib/gcc_gvmat64/gvmat64.S b/src/png/zlib/contrib/gcc_gvmat64/gvmat64.S
deleted file mode 100644
index 23309fa28..000000000
--- a/src/png/zlib/contrib/gcc_gvmat64/gvmat64.S
+++ /dev/null
@@ -1,574 +0,0 @@
-/*
-;uInt longest_match_x64(
-;    deflate_state *s,
-;    IPos cur_match);                             // current match 
-
-; gvmat64.S -- Asm portion of the optimized longest_match for 32 bits x86_64
-;  (AMD64 on Athlon 64, Opteron, Phenom
-;     and Intel EM64T on Pentium 4 with EM64T, Pentium D, Core 2 Duo, Core I5/I7)
-; this file is translation from gvmat64.asm to GCC 4.x (for Linux, Mac XCode)
-; Copyright (C) 1995-2010 Jean-loup Gailly, Brian Raiter and Gilles Vollant.
-;
-; File written by Gilles Vollant, by converting to assembly the longest_match
-;  from Jean-loup Gailly in deflate.c of zLib and infoZip zip.
-;  and by taking inspiration on asm686 with masm, optimised assembly code
-;        from Brian Raiter, written 1998
-;
-;  This software is provided 'as-is', without any express or implied
-;  warranty.  In no event will the authors be held liable for any damages
-;  arising from the use of this software.
-;
-;  Permission is granted to anyone to use this software for any purpose,
-;  including commercial applications, and to alter it and redistribute it
-;  freely, subject to the following restrictions:
-;
-;  1. The origin of this software must not be misrepresented; you must not
-;     claim that you wrote the original software. If you use this software
-;     in a product, an acknowledgment in the product documentation would be
-;     appreciated but is not required.
-;  2. Altered source versions must be plainly marked as such, and must not be
-;     misrepresented as being the original software
-;  3. This notice may not be removed or altered from any source distribution.
-;
-;         http://www.zlib.net
-;         http://www.winimage.com/zLibDll
-;         http://www.muppetlabs.com/~breadbox/software/assembly.html
-;
-; to compile this file for zLib, I use option:
-;   gcc -c -arch x86_64 gvmat64.S
-
-
-;uInt longest_match(s, cur_match)
-;    deflate_state *s;
-;    IPos cur_match;                             // current match /
-;
-; with XCode for Mac, I had strange error with some jump on intel syntax
-; this is why BEFORE_JMP and AFTER_JMP are used
- */
-
-
-#define BEFORE_JMP .att_syntax
-#define AFTER_JMP .intel_syntax noprefix
-
-#ifndef NO_UNDERLINE
-#	define	match_init	_match_init
-#	define	longest_match	_longest_match
-#endif
-
-.intel_syntax noprefix
-
-.globl	match_init, longest_match
-.text
-longest_match:
-
-
-
-#define LocalVarsSize 96
-/*
-; register used : rax,rbx,rcx,rdx,rsi,rdi,r8,r9,r10,r11,r12
-; free register :  r14,r15
-; register can be saved : rsp
-*/
-
-#define chainlenwmask     (rsp + 8 - LocalVarsSize)
-#define nicematch         (rsp + 16 - LocalVarsSize)
-
-#define save_rdi        (rsp + 24 - LocalVarsSize)
-#define save_rsi        (rsp + 32 - LocalVarsSize)
-#define save_rbx        (rsp + 40 - LocalVarsSize)
-#define save_rbp        (rsp + 48 - LocalVarsSize)
-#define save_r12        (rsp + 56 - LocalVarsSize)
-#define save_r13        (rsp + 64 - LocalVarsSize)
-#define save_r14        (rsp + 72 - LocalVarsSize)
-#define save_r15        (rsp + 80 - LocalVarsSize)
-
-
-/*
-;  all the +4 offsets are due to the addition of pending_buf_size (in zlib
-;  in the deflate_state structure since the asm code was first written
-;  (if you compile with zlib 1.0.4 or older, remove the +4).
-;  Note : these value are good with a 8 bytes boundary pack structure
-*/
-
-#define    MAX_MATCH              258
-#define    MIN_MATCH              3
-#define    MIN_LOOKAHEAD          (MAX_MATCH+MIN_MATCH+1)
-
-/*
-;;; Offsets for fields in the deflate_state structure. These numbers
-;;; are calculated from the definition of deflate_state, with the
-;;; assumption that the compiler will dword-align the fields. (Thus,
-;;; changing the definition of deflate_state could easily cause this
-;;; program to crash horribly, without so much as a warning at
-;;; compile time. Sigh.)
-
-;  all the +zlib1222add offsets are due to the addition of fields
-;  in zlib in the deflate_state structure since the asm code was first written
-;  (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)").
-;  (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0").
-;  if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8").
-*/
-
-
-
-/* you can check the structure offset by running
-
-#include <stdlib.h>
-#include <stdio.h>
-#include "deflate.h"
-
-void print_depl()
-{
-deflate_state ds;
-deflate_state *s=&ds;
-printf("size pointer=%u\n",(int)sizeof(void*));
-
-printf("#define dsWSize         %u\n",(int)(((char*)&(s->w_size))-((char*)s)));
-printf("#define dsWMask         %u\n",(int)(((char*)&(s->w_mask))-((char*)s)));
-printf("#define dsWindow        %u\n",(int)(((char*)&(s->window))-((char*)s)));
-printf("#define dsPrev          %u\n",(int)(((char*)&(s->prev))-((char*)s)));
-printf("#define dsMatchLen      %u\n",(int)(((char*)&(s->match_length))-((char*)s)));
-printf("#define dsPrevMatch     %u\n",(int)(((char*)&(s->prev_match))-((char*)s)));
-printf("#define dsStrStart      %u\n",(int)(((char*)&(s->strstart))-((char*)s)));
-printf("#define dsMatchStart    %u\n",(int)(((char*)&(s->match_start))-((char*)s)));
-printf("#define dsLookahead     %u\n",(int)(((char*)&(s->lookahead))-((char*)s)));
-printf("#define dsPrevLen       %u\n",(int)(((char*)&(s->prev_length))-((char*)s)));
-printf("#define dsMaxChainLen   %u\n",(int)(((char*)&(s->max_chain_length))-((char*)s)));
-printf("#define dsGoodMatch     %u\n",(int)(((char*)&(s->good_match))-((char*)s)));
-printf("#define dsNiceMatch     %u\n",(int)(((char*)&(s->nice_match))-((char*)s)));
-}
-*/
-
-#define dsWSize          68
-#define dsWMask          76
-#define dsWindow         80
-#define dsPrev           96
-#define dsMatchLen       144
-#define dsPrevMatch      148
-#define dsStrStart       156
-#define dsMatchStart     160
-#define dsLookahead      164
-#define dsPrevLen        168
-#define dsMaxChainLen    172
-#define dsGoodMatch      188
-#define dsNiceMatch      192
-
-#define window_size      [ rcx + dsWSize]
-#define WMask            [ rcx + dsWMask]
-#define window_ad        [ rcx + dsWindow]
-#define prev_ad          [ rcx + dsPrev]
-#define strstart         [ rcx + dsStrStart]
-#define match_start      [ rcx + dsMatchStart]
-#define Lookahead        [ rcx + dsLookahead] //; 0ffffffffh on infozip
-#define prev_length      [ rcx + dsPrevLen]
-#define max_chain_length [ rcx + dsMaxChainLen]
-#define good_match       [ rcx + dsGoodMatch]
-#define nice_match       [ rcx + dsNiceMatch]
-
-/*
-; windows:
-; parameter 1 in rcx(deflate state s), param 2 in rdx (cur match)
-
-; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and
-; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp
-;
-; All registers must be preserved across the call, except for
-;   rax, rcx, rdx, r8, r9, r10, and r11, which are scratch.
-
-;
-; gcc on macosx-linux:
-; see http://www.x86-64.org/documentation/abi-0.99.pdf
-; param 1 in rdi, param 2 in rsi
-; rbx, rsp, rbp, r12 to r15 must be preserved
-
-;;; Save registers that the compiler may be using, and adjust esp to
-;;; make room for our stack frame.
-
-
-;;; Retrieve the function arguments. r8d will hold cur_match
-;;; throughout the entire function. edx will hold the pointer to the
-;;; deflate_state structure during the function's setup (before
-;;; entering the main loop.
-
-; ms: parameter 1 in rcx (deflate_state* s), param 2 in edx -> r8 (cur match)
-; mac: param 1 in rdi, param 2 rsi
-; this clear high 32 bits of r8, which can be garbage in both r8 and rdx
-*/
-        mov [save_rbx],rbx
-        mov [save_rbp],rbp
-
-
-        mov rcx,rdi
-
-        mov r8d,esi
-
-
-        mov [save_r12],r12
-        mov [save_r13],r13
-        mov [save_r14],r14
-        mov [save_r15],r15
-
-
-//;;; uInt wmask = s->w_mask;
-//;;; unsigned chain_length = s->max_chain_length;
-//;;; if (s->prev_length >= s->good_match) {
-//;;;     chain_length >>= 2;
-//;;; }
-
-
-        mov edi, prev_length
-        mov esi, good_match
-        mov eax, WMask
-        mov ebx, max_chain_length
-        cmp edi, esi
-        jl  LastMatchGood
-        shr ebx, 2
-LastMatchGood:
-
-//;;; chainlen is decremented once beforehand so that the function can
-//;;; use the sign flag instead of the zero flag for the exit test.
-//;;; It is then shifted into the high word, to make room for the wmask
-//;;; value, which it will always accompany.
-
-        dec ebx
-        shl ebx, 16
-        or  ebx, eax
-
-//;;; on zlib only
-//;;; if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;
-
-
-
-        mov eax, nice_match
-        mov [chainlenwmask], ebx
-        mov r10d, Lookahead
-        cmp r10d, eax
-        cmovnl r10d, eax
-        mov [nicematch],r10d
-
-
-
-//;;; register Bytef *scan = s->window + s->strstart;
-        mov r10, window_ad
-        mov ebp, strstart
-        lea r13, [r10 + rbp]
-
-//;;; Determine how many bytes the scan ptr is off from being
-//;;; dword-aligned.
-
-         mov r9,r13
-         neg r13
-         and r13,3
-
-//;;; IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
-//;;;     s->strstart - (IPos)MAX_DIST(s) : NIL;
-
-
-        mov eax, window_size
-        sub eax, MIN_LOOKAHEAD
-
-
-        xor edi,edi
-        sub ebp, eax
-
-        mov r11d, prev_length
-
-        cmovng ebp,edi
-
-//;;; int best_len = s->prev_length;
-
-
-//;;; Store the sum of s->window + best_len in esi locally, and in esi.
-
-       lea  rsi,[r10+r11]
-
-//;;; register ush scan_start = *(ushf*)scan;
-//;;; register ush scan_end   = *(ushf*)(scan+best_len-1);
-//;;; Posf *prev = s->prev;
-
-        movzx r12d,word ptr [r9]
-        movzx ebx, word ptr [r9 + r11 - 1]
-
-        mov rdi, prev_ad
-
-//;;; Jump into the main loop.
-
-        mov edx, [chainlenwmask]
-
-        cmp bx,word ptr [rsi + r8 - 1]
-        jz  LookupLoopIsZero
-				
-						
-						
-LookupLoop1:
-        and r8d, edx
-
-        movzx   r8d, word ptr [rdi + r8*2]
-        cmp r8d, ebp
-        jbe LeaveNow
-		
-		
-		
-        sub edx, 0x00010000
-		BEFORE_JMP
-        js  LeaveNow
-		AFTER_JMP
-
-LoopEntry1:
-        cmp bx,word ptr [rsi + r8 - 1]
-		BEFORE_JMP
-        jz  LookupLoopIsZero
-		AFTER_JMP
-
-LookupLoop2:
-        and r8d, edx
-
-        movzx   r8d, word ptr [rdi + r8*2]
-        cmp r8d, ebp
-		BEFORE_JMP
-        jbe LeaveNow
-		AFTER_JMP
-        sub edx, 0x00010000
-		BEFORE_JMP
-        js  LeaveNow
-		AFTER_JMP
-
-LoopEntry2:
-        cmp bx,word ptr [rsi + r8 - 1]
-		BEFORE_JMP
-        jz  LookupLoopIsZero
-		AFTER_JMP
-
-LookupLoop4:
-        and r8d, edx
-
-        movzx   r8d, word ptr [rdi + r8*2]
-        cmp r8d, ebp
-		BEFORE_JMP
-        jbe LeaveNow
-		AFTER_JMP
-        sub edx, 0x00010000
-		BEFORE_JMP
-        js  LeaveNow
-		AFTER_JMP
-
-LoopEntry4:
-
-        cmp bx,word ptr [rsi + r8 - 1]
-		BEFORE_JMP
-        jnz LookupLoop1
-        jmp LookupLoopIsZero
-		AFTER_JMP
-/*
-;;; do {
-;;;     match = s->window + cur_match;
-;;;     if (*(ushf*)(match+best_len-1) != scan_end ||
-;;;         *(ushf*)match != scan_start) continue;
-;;;     [...]
-;;; } while ((cur_match = prev[cur_match & wmask]) > limit
-;;;          && --chain_length != 0);
-;;;
-;;; Here is the inner loop of the function. The function will spend the
-;;; majority of its time in this loop, and majority of that time will
-;;; be spent in the first ten instructions.
-;;;
-;;; Within this loop:
-;;; ebx = scanend
-;;; r8d = curmatch
-;;; edx = chainlenwmask - i.e., ((chainlen << 16) | wmask)
-;;; esi = windowbestlen - i.e., (window + bestlen)
-;;; edi = prev
-;;; ebp = limit
-*/
-.balign 16
-LookupLoop:
-        and r8d, edx
-
-        movzx   r8d, word ptr [rdi + r8*2]
-        cmp r8d, ebp
-		BEFORE_JMP
-        jbe LeaveNow
-		AFTER_JMP
-        sub edx, 0x00010000
-		BEFORE_JMP
-        js  LeaveNow
-		AFTER_JMP
-
-LoopEntry:
-
-        cmp bx,word ptr [rsi + r8 - 1]
-		BEFORE_JMP
-        jnz LookupLoop1
-		AFTER_JMP
-LookupLoopIsZero:
-        cmp     r12w, word ptr [r10 + r8]
-		BEFORE_JMP
-        jnz LookupLoop1
-		AFTER_JMP
-
-
-//;;; Store the current value of chainlen.
-        mov [chainlenwmask], edx
-/*
-;;; Point edi to the string under scrutiny, and esi to the string we
-;;; are hoping to match it up with. In actuality, esi and edi are
-;;; both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and edx is
-;;; initialized to -(MAX_MATCH_8 - scanalign).
-*/
-        lea rsi,[r8+r10]
-        mov rdx, 0xfffffffffffffef8 //; -(MAX_MATCH_8)
-        lea rsi, [rsi + r13 + 0x0108] //;MAX_MATCH_8]
-        lea rdi, [r9 + r13 + 0x0108] //;MAX_MATCH_8]
-
-        prefetcht1 [rsi+rdx]
-        prefetcht1 [rdi+rdx]
-
-/*
-;;; Test the strings for equality, 8 bytes at a time. At the end,
-;;; adjust rdx so that it is offset to the exact byte that mismatched.
-;;;
-;;; We already know at this point that the first three bytes of the
-;;; strings match each other, and they can be safely passed over before
-;;; starting the compare loop. So what this code does is skip over 0-3
-;;; bytes, as much as necessary in order to dword-align the edi
-;;; pointer. (rsi will still be misaligned three times out of four.)
-;;;
-;;; It should be confessed that this loop usually does not represent
-;;; much of the total running time. Replacing it with a more
-;;; straightforward "rep cmpsb" would not drastically degrade
-;;; performance.
-*/
-
-LoopCmps:
-        mov rax, [rsi + rdx]
-        xor rax, [rdi + rdx]
-        jnz LeaveLoopCmps
-
-        mov rax, [rsi + rdx + 8]
-        xor rax, [rdi + rdx + 8]
-        jnz LeaveLoopCmps8
-
-
-        mov rax, [rsi + rdx + 8+8]
-        xor rax, [rdi + rdx + 8+8]
-        jnz LeaveLoopCmps16
-
-        add rdx,8+8+8
-
-		BEFORE_JMP
-        jnz  LoopCmps
-        jmp  LenMaximum
-		AFTER_JMP
-		
-LeaveLoopCmps16: add rdx,8
-LeaveLoopCmps8: add rdx,8
-LeaveLoopCmps:
-
-        test    eax, 0x0000FFFF
-        jnz LenLower
-
-        test eax,0xffffffff
-
-        jnz LenLower32
-
-        add rdx,4
-        shr rax,32
-        or ax,ax
-		BEFORE_JMP
-        jnz LenLower
-		AFTER_JMP
-
-LenLower32:
-        shr eax,16
-        add rdx,2
-		
-LenLower:		
-        sub al, 1
-        adc rdx, 0
-//;;; Calculate the length of the match. If it is longer than MAX_MATCH,
-//;;; then automatically accept it as the best possible match and leave.
-
-        lea rax, [rdi + rdx]
-        sub rax, r9
-        cmp eax, MAX_MATCH
-		BEFORE_JMP
-        jge LenMaximum
-		AFTER_JMP
-/*
-;;; If the length of the match is not longer than the best match we
-;;; have so far, then forget it and return to the lookup loop.
-;///////////////////////////////////
-*/
-        cmp eax, r11d
-        jg  LongerMatch
-
-        lea rsi,[r10+r11]
-
-        mov rdi, prev_ad
-        mov edx, [chainlenwmask]
-		BEFORE_JMP
-        jmp LookupLoop
-		AFTER_JMP
-/*
-;;;         s->match_start = cur_match;
-;;;         best_len = len;
-;;;         if (len >= nice_match) break;
-;;;         scan_end = *(ushf*)(scan+best_len-1);
-*/
-LongerMatch:
-        mov r11d, eax
-        mov match_start, r8d
-        cmp eax, [nicematch]
-		BEFORE_JMP
-        jge LeaveNow
-		AFTER_JMP
-
-        lea rsi,[r10+rax]
-
-        movzx   ebx, word ptr [r9 + rax - 1]
-        mov rdi, prev_ad
-        mov edx, [chainlenwmask]
-		BEFORE_JMP
-        jmp LookupLoop
-		AFTER_JMP
-
-//;;; Accept the current string, with the maximum possible length.
-
-LenMaximum:
-        mov r11d,MAX_MATCH
-        mov match_start, r8d
-
-//;;; if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
-//;;; return s->lookahead;
-
-LeaveNow:
-        mov eax, Lookahead
-        cmp r11d, eax
-        cmovng eax, r11d
-
-
-
-//;;; Restore the stack and return from whence we came.
-
-
-//        mov rsi,[save_rsi]
-//        mov rdi,[save_rdi]
-        mov rbx,[save_rbx]
-        mov rbp,[save_rbp]
-        mov r12,[save_r12]
-        mov r13,[save_r13]
-        mov r14,[save_r14]
-        mov r15,[save_r15]
-
-
-        ret 0
-//; please don't remove this string !
-//; Your can freely use gvmat64 in any free or commercial app
-//; but it is far better don't remove the string in the binary!
- //   db     0dh,0ah,"asm686 with masm, optimised assembly code from Brian Raiter, written 1998, converted to amd 64 by Gilles Vollant 2005",0dh,0ah,0
-
-
-match_init:
-  ret 0
-
-
diff --git a/src/png/zlib/contrib/infback9/README b/src/png/zlib/contrib/infback9/README
deleted file mode 100644
index e75ed1329..000000000
--- a/src/png/zlib/contrib/infback9/README
+++ /dev/null
@@ -1 +0,0 @@
-See infback9.h for what this is and how to use it.
diff --git a/src/png/zlib/contrib/infback9/infback9.c b/src/png/zlib/contrib/infback9/infback9.c
deleted file mode 100644
index 05fb3e338..000000000
--- a/src/png/zlib/contrib/infback9/infback9.c
+++ /dev/null
@@ -1,615 +0,0 @@
-/* infback9.c -- inflate deflate64 data using a call-back interface
- * Copyright (C) 1995-2008 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-#include "zutil.h"
-#include "infback9.h"
-#include "inftree9.h"
-#include "inflate9.h"
-
-#define WSIZE 65536UL
-
-/*
-   strm provides memory allocation functions in zalloc and zfree, or
-   Z_NULL to use the library memory allocation functions.
-
-   window is a user-supplied window and output buffer that is 64K bytes.
- */
-int ZEXPORT inflateBack9Init_(strm, window, version, stream_size)
-z_stream FAR *strm;
-unsigned char FAR *window;
-const char *version;
-int stream_size;
-{
-    struct inflate_state FAR *state;
-
-    if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
-        stream_size != (int)(sizeof(z_stream)))
-        return Z_VERSION_ERROR;
-    if (strm == Z_NULL || window == Z_NULL)
-        return Z_STREAM_ERROR;
-    strm->msg = Z_NULL;                 /* in case we return an error */
-    if (strm->zalloc == (alloc_func)0) {
-        strm->zalloc = zcalloc;
-        strm->opaque = (voidpf)0;
-    }
-    if (strm->zfree == (free_func)0) strm->zfree = zcfree;
-    state = (struct inflate_state FAR *)ZALLOC(strm, 1,
-                                               sizeof(struct inflate_state));
-    if (state == Z_NULL) return Z_MEM_ERROR;
-    Tracev((stderr, "inflate: allocated\n"));
-    strm->state = (voidpf)state;
-    state->window = window;
-    return Z_OK;
-}
-
-/*
-   Build and output length and distance decoding tables for fixed code
-   decoding.
- */
-#ifdef MAKEFIXED
-#include <stdio.h>
-
-void makefixed9(void)
-{
-    unsigned sym, bits, low, size;
-    code *next, *lenfix, *distfix;
-    struct inflate_state state;
-    code fixed[544];
-
-    /* literal/length table */
-    sym = 0;
-    while (sym < 144) state.lens[sym++] = 8;
-    while (sym < 256) state.lens[sym++] = 9;
-    while (sym < 280) state.lens[sym++] = 7;
-    while (sym < 288) state.lens[sym++] = 8;
-    next = fixed;
-    lenfix = next;
-    bits = 9;
-    inflate_table9(LENS, state.lens, 288, &(next), &(bits), state.work);
-
-    /* distance table */
-    sym = 0;
-    while (sym < 32) state.lens[sym++] = 5;
-    distfix = next;
-    bits = 5;
-    inflate_table9(DISTS, state.lens, 32, &(next), &(bits), state.work);
-
-    /* write tables */
-    puts("    /* inffix9.h -- table for decoding deflate64 fixed codes");
-    puts("     * Generated automatically by makefixed9().");
-    puts("     */");
-    puts("");
-    puts("    /* WARNING: this file should *not* be used by applications.");
-    puts("       It is part of the implementation of this library and is");
-    puts("       subject to change. Applications should only use zlib.h.");
-    puts("     */");
-    puts("");
-    size = 1U << 9;
-    printf("    static const code lenfix[%u] = {", size);
-    low = 0;
-    for (;;) {
-        if ((low % 6) == 0) printf("\n        ");
-        printf("{%u,%u,%d}", lenfix[low].op, lenfix[low].bits,
-               lenfix[low].val);
-        if (++low == size) break;
-        putchar(',');
-    }
-    puts("\n    };");
-    size = 1U << 5;
-    printf("\n    static const code distfix[%u] = {", size);
-    low = 0;
-    for (;;) {
-        if ((low % 5) == 0) printf("\n        ");
-        printf("{%u,%u,%d}", distfix[low].op, distfix[low].bits,
-               distfix[low].val);
-        if (++low == size) break;
-        putchar(',');
-    }
-    puts("\n    };");
-}
-#endif /* MAKEFIXED */
-
-/* Macros for inflateBack(): */
-
-/* Clear the input bit accumulator */
-#define INITBITS() \
-    do { \
-        hold = 0; \
-        bits = 0; \
-    } while (0)
-
-/* Assure that some input is available.  If input is requested, but denied,
-   then return a Z_BUF_ERROR from inflateBack(). */
-#define PULL() \
-    do { \
-        if (have == 0) { \
-            have = in(in_desc, &next); \
-            if (have == 0) { \
-                next = Z_NULL; \
-                ret = Z_BUF_ERROR; \
-                goto inf_leave; \
-            } \
-        } \
-    } while (0)
-
-/* Get a byte of input into the bit accumulator, or return from inflateBack()
-   with an error if there is no input available. */
-#define PULLBYTE() \
-    do { \
-        PULL(); \
-        have--; \
-        hold += (unsigned long)(*next++) << bits; \
-        bits += 8; \
-    } while (0)
-
-/* Assure that there are at least n bits in the bit accumulator.  If there is
-   not enough available input to do that, then return from inflateBack() with
-   an error. */
-#define NEEDBITS(n) \
-    do { \
-        while (bits < (unsigned)(n)) \
-            PULLBYTE(); \
-    } while (0)
-
-/* Return the low n bits of the bit accumulator (n <= 16) */
-#define BITS(n) \
-    ((unsigned)hold & ((1U << (n)) - 1))
-
-/* Remove n bits from the bit accumulator */
-#define DROPBITS(n) \
-    do { \
-        hold >>= (n); \
-        bits -= (unsigned)(n); \
-    } while (0)
-
-/* Remove zero to seven bits as needed to go to a byte boundary */
-#define BYTEBITS() \
-    do { \
-        hold >>= bits & 7; \
-        bits -= bits & 7; \
-    } while (0)
-
-/* Assure that some output space is available, by writing out the window
-   if it's full.  If the write fails, return from inflateBack() with a
-   Z_BUF_ERROR. */
-#define ROOM() \
-    do { \
-        if (left == 0) { \
-            put = window; \
-            left = WSIZE; \
-            wrap = 1; \
-            if (out(out_desc, put, (unsigned)left)) { \
-                ret = Z_BUF_ERROR; \
-                goto inf_leave; \
-            } \
-        } \
-    } while (0)
-
-/*
-   strm provides the memory allocation functions and window buffer on input,
-   and provides information on the unused input on return.  For Z_DATA_ERROR
-   returns, strm will also provide an error message.
-
-   in() and out() are the call-back input and output functions.  When
-   inflateBack() needs more input, it calls in().  When inflateBack() has
-   filled the window with output, or when it completes with data in the
-   window, it calls out() to write out the data.  The application must not
-   change the provided input until in() is called again or inflateBack()
-   returns.  The application must not change the window/output buffer until
-   inflateBack() returns.
-
-   in() and out() are called with a descriptor parameter provided in the
-   inflateBack() call.  This parameter can be a structure that provides the
-   information required to do the read or write, as well as accumulated
-   information on the input and output such as totals and check values.
-
-   in() should return zero on failure.  out() should return non-zero on
-   failure.  If either in() or out() fails, than inflateBack() returns a
-   Z_BUF_ERROR.  strm->next_in can be checked for Z_NULL to see whether it
-   was in() or out() that caused in the error.  Otherwise,  inflateBack()
-   returns Z_STREAM_END on success, Z_DATA_ERROR for an deflate format
-   error, or Z_MEM_ERROR if it could not allocate memory for the state.
-   inflateBack() can also return Z_STREAM_ERROR if the input parameters
-   are not correct, i.e. strm is Z_NULL or the state was not initialized.
- */
-int ZEXPORT inflateBack9(strm, in, in_desc, out, out_desc)
-z_stream FAR *strm;
-in_func in;
-void FAR *in_desc;
-out_func out;
-void FAR *out_desc;
-{
-    struct inflate_state FAR *state;
-    z_const unsigned char FAR *next;    /* next input */
-    unsigned char FAR *put;     /* next output */
-    unsigned have;              /* available input */
-    unsigned long left;         /* available output */
-    inflate_mode mode;          /* current inflate mode */
-    int lastblock;              /* true if processing last block */
-    int wrap;                   /* true if the window has wrapped */
-    unsigned char FAR *window;  /* allocated sliding window, if needed */
-    unsigned long hold;         /* bit buffer */
-    unsigned bits;              /* bits in bit buffer */
-    unsigned extra;             /* extra bits needed */
-    unsigned long length;       /* literal or length of data to copy */
-    unsigned long offset;       /* distance back to copy string from */
-    unsigned long copy;         /* number of stored or match bytes to copy */
-    unsigned char FAR *from;    /* where to copy match bytes from */
-    code const FAR *lencode;    /* starting table for length/literal codes */
-    code const FAR *distcode;   /* starting table for distance codes */
-    unsigned lenbits;           /* index bits for lencode */
-    unsigned distbits;          /* index bits for distcode */
-    code here;                  /* current decoding table entry */
-    code last;                  /* parent table entry */
-    unsigned len;               /* length to copy for repeats, bits to drop */
-    int ret;                    /* return code */
-    static const unsigned short order[19] = /* permutation of code lengths */
-        {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
-#include "inffix9.h"
-
-    /* Check that the strm exists and that the state was initialized */
-    if (strm == Z_NULL || strm->state == Z_NULL)
-        return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-
-    /* Reset the state */
-    strm->msg = Z_NULL;
-    mode = TYPE;
-    lastblock = 0;
-    wrap = 0;
-    window = state->window;
-    next = strm->next_in;
-    have = next != Z_NULL ? strm->avail_in : 0;
-    hold = 0;
-    bits = 0;
-    put = window;
-    left = WSIZE;
-    lencode = Z_NULL;
-    distcode = Z_NULL;
-
-    /* Inflate until end of block marked as last */
-    for (;;)
-        switch (mode) {
-        case TYPE:
-            /* determine and dispatch block type */
-            if (lastblock) {
-                BYTEBITS();
-                mode = DONE;
-                break;
-            }
-            NEEDBITS(3);
-            lastblock = BITS(1);
-            DROPBITS(1);
-            switch (BITS(2)) {
-            case 0:                             /* stored block */
-                Tracev((stderr, "inflate:     stored block%s\n",
-                        lastblock ? " (last)" : ""));
-                mode = STORED;
-                break;
-            case 1:                             /* fixed block */
-                lencode = lenfix;
-                lenbits = 9;
-                distcode = distfix;
-                distbits = 5;
-                Tracev((stderr, "inflate:     fixed codes block%s\n",
-                        lastblock ? " (last)" : ""));
-                mode = LEN;                     /* decode codes */
-                break;
-            case 2:                             /* dynamic block */
-                Tracev((stderr, "inflate:     dynamic codes block%s\n",
-                        lastblock ? " (last)" : ""));
-                mode = TABLE;
-                break;
-            case 3:
-                strm->msg = (char *)"invalid block type";
-                mode = BAD;
-            }
-            DROPBITS(2);
-            break;
-
-        case STORED:
-            /* get and verify stored block length */
-            BYTEBITS();                         /* go to byte boundary */
-            NEEDBITS(32);
-            if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) {
-                strm->msg = (char *)"invalid stored block lengths";
-                mode = BAD;
-                break;
-            }
-            length = (unsigned)hold & 0xffff;
-            Tracev((stderr, "inflate:       stored length %lu\n",
-                    length));
-            INITBITS();
-
-            /* copy stored block from input to output */
-            while (length != 0) {
-                copy = length;
-                PULL();
-                ROOM();
-                if (copy > have) copy = have;
-                if (copy > left) copy = left;
-                zmemcpy(put, next, copy);
-                have -= copy;
-                next += copy;
-                left -= copy;
-                put += copy;
-                length -= copy;
-            }
-            Tracev((stderr, "inflate:       stored end\n"));
-            mode = TYPE;
-            break;
-
-        case TABLE:
-            /* get dynamic table entries descriptor */
-            NEEDBITS(14);
-            state->nlen = BITS(5) + 257;
-            DROPBITS(5);
-            state->ndist = BITS(5) + 1;
-            DROPBITS(5);
-            state->ncode = BITS(4) + 4;
-            DROPBITS(4);
-            if (state->nlen > 286) {
-                strm->msg = (char *)"too many length symbols";
-                mode = BAD;
-                break;
-            }
-            Tracev((stderr, "inflate:       table sizes ok\n"));
-
-            /* get code length code lengths (not a typo) */
-            state->have = 0;
-            while (state->have < state->ncode) {
-                NEEDBITS(3);
-                state->lens[order[state->have++]] = (unsigned short)BITS(3);
-                DROPBITS(3);
-            }
-            while (state->have < 19)
-                state->lens[order[state->have++]] = 0;
-            state->next = state->codes;
-            lencode = (code const FAR *)(state->next);
-            lenbits = 7;
-            ret = inflate_table9(CODES, state->lens, 19, &(state->next),
-                                &(lenbits), state->work);
-            if (ret) {
-                strm->msg = (char *)"invalid code lengths set";
-                mode = BAD;
-                break;
-            }
-            Tracev((stderr, "inflate:       code lengths ok\n"));
-
-            /* get length and distance code code lengths */
-            state->have = 0;
-            while (state->have < state->nlen + state->ndist) {
-                for (;;) {
-                    here = lencode[BITS(lenbits)];
-                    if ((unsigned)(here.bits) <= bits) break;
-                    PULLBYTE();
-                }
-                if (here.val < 16) {
-                    NEEDBITS(here.bits);
-                    DROPBITS(here.bits);
-                    state->lens[state->have++] = here.val;
-                }
-                else {
-                    if (here.val == 16) {
-                        NEEDBITS(here.bits + 2);
-                        DROPBITS(here.bits);
-                        if (state->have == 0) {
-                            strm->msg = (char *)"invalid bit length repeat";
-                            mode = BAD;
-                            break;
-                        }
-                        len = (unsigned)(state->lens[state->have - 1]);
-                        copy = 3 + BITS(2);
-                        DROPBITS(2);
-                    }
-                    else if (here.val == 17) {
-                        NEEDBITS(here.bits + 3);
-                        DROPBITS(here.bits);
-                        len = 0;
-                        copy = 3 + BITS(3);
-                        DROPBITS(3);
-                    }
-                    else {
-                        NEEDBITS(here.bits + 7);
-                        DROPBITS(here.bits);
-                        len = 0;
-                        copy = 11 + BITS(7);
-                        DROPBITS(7);
-                    }
-                    if (state->have + copy > state->nlen + state->ndist) {
-                        strm->msg = (char *)"invalid bit length repeat";
-                        mode = BAD;
-                        break;
-                    }
-                    while (copy--)
-                        state->lens[state->have++] = (unsigned short)len;
-                }
-            }
-
-            /* handle error breaks in while */
-            if (mode == BAD) break;
-
-            /* check for end-of-block code (better have one) */
-            if (state->lens[256] == 0) {
-                strm->msg = (char *)"invalid code -- missing end-of-block";
-                mode = BAD;
-                break;
-            }
-
-            /* build code tables -- note: do not change the lenbits or distbits
-               values here (9 and 6) without reading the comments in inftree9.h
-               concerning the ENOUGH constants, which depend on those values */
-            state->next = state->codes;
-            lencode = (code const FAR *)(state->next);
-            lenbits = 9;
-            ret = inflate_table9(LENS, state->lens, state->nlen,
-                            &(state->next), &(lenbits), state->work);
-            if (ret) {
-                strm->msg = (char *)"invalid literal/lengths set";
-                mode = BAD;
-                break;
-            }
-            distcode = (code const FAR *)(state->next);
-            distbits = 6;
-            ret = inflate_table9(DISTS, state->lens + state->nlen,
-                            state->ndist, &(state->next), &(distbits),
-                            state->work);
-            if (ret) {
-                strm->msg = (char *)"invalid distances set";
-                mode = BAD;
-                break;
-            }
-            Tracev((stderr, "inflate:       codes ok\n"));
-            mode = LEN;
-
-        case LEN:
-            /* get a literal, length, or end-of-block code */
-            for (;;) {
-                here = lencode[BITS(lenbits)];
-                if ((unsigned)(here.bits) <= bits) break;
-                PULLBYTE();
-            }
-            if (here.op && (here.op & 0xf0) == 0) {
-                last = here;
-                for (;;) {
-                    here = lencode[last.val +
-                            (BITS(last.bits + last.op) >> last.bits)];
-                    if ((unsigned)(last.bits + here.bits) <= bits) break;
-                    PULLBYTE();
-                }
-                DROPBITS(last.bits);
-            }
-            DROPBITS(here.bits);
-            length = (unsigned)here.val;
-
-            /* process literal */
-            if (here.op == 0) {
-                Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
-                        "inflate:         literal '%c'\n" :
-                        "inflate:         literal 0x%02x\n", here.val));
-                ROOM();
-                *put++ = (unsigned char)(length);
-                left--;
-                mode = LEN;
-                break;
-            }
-
-            /* process end of block */
-            if (here.op & 32) {
-                Tracevv((stderr, "inflate:         end of block\n"));
-                mode = TYPE;
-                break;
-            }
-
-            /* invalid code */
-            if (here.op & 64) {
-                strm->msg = (char *)"invalid literal/length code";
-                mode = BAD;
-                break;
-            }
-
-            /* length code -- get extra bits, if any */
-            extra = (unsigned)(here.op) & 31;
-            if (extra != 0) {
-                NEEDBITS(extra);
-                length += BITS(extra);
-                DROPBITS(extra);
-            }
-            Tracevv((stderr, "inflate:         length %lu\n", length));
-
-            /* get distance code */
-            for (;;) {
-                here = distcode[BITS(distbits)];
-                if ((unsigned)(here.bits) <= bits) break;
-                PULLBYTE();
-            }
-            if ((here.op & 0xf0) == 0) {
-                last = here;
-                for (;;) {
-                    here = distcode[last.val +
-                            (BITS(last.bits + last.op) >> last.bits)];
-                    if ((unsigned)(last.bits + here.bits) <= bits) break;
-                    PULLBYTE();
-                }
-                DROPBITS(last.bits);
-            }
-            DROPBITS(here.bits);
-            if (here.op & 64) {
-                strm->msg = (char *)"invalid distance code";
-                mode = BAD;
-                break;
-            }
-            offset = (unsigned)here.val;
-
-            /* get distance extra bits, if any */
-            extra = (unsigned)(here.op) & 15;
-            if (extra != 0) {
-                NEEDBITS(extra);
-                offset += BITS(extra);
-                DROPBITS(extra);
-            }
-            if (offset > WSIZE - (wrap ? 0: left)) {
-                strm->msg = (char *)"invalid distance too far back";
-                mode = BAD;
-                break;
-            }
-            Tracevv((stderr, "inflate:         distance %lu\n", offset));
-
-            /* copy match from window to output */
-            do {
-                ROOM();
-                copy = WSIZE - offset;
-                if (copy < left) {
-                    from = put + copy;
-                    copy = left - copy;
-                }
-                else {
-                    from = put - offset;
-                    copy = left;
-                }
-                if (copy > length) copy = length;
-                length -= copy;
-                left -= copy;
-                do {
-                    *put++ = *from++;
-                } while (--copy);
-            } while (length != 0);
-            break;
-
-        case DONE:
-            /* inflate stream terminated properly -- write leftover output */
-            ret = Z_STREAM_END;
-            if (left < WSIZE) {
-                if (out(out_desc, window, (unsigned)(WSIZE - left)))
-                    ret = Z_BUF_ERROR;
-            }
-            goto inf_leave;
-
-        case BAD:
-            ret = Z_DATA_ERROR;
-            goto inf_leave;
-
-        default:                /* can't happen, but makes compilers happy */
-            ret = Z_STREAM_ERROR;
-            goto inf_leave;
-        }
-
-    /* Return unused input */
-  inf_leave:
-    strm->next_in = next;
-    strm->avail_in = have;
-    return ret;
-}
-
-int ZEXPORT inflateBack9End(strm)
-z_stream FAR *strm;
-{
-    if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0)
-        return Z_STREAM_ERROR;
-    ZFREE(strm, strm->state);
-    strm->state = Z_NULL;
-    Tracev((stderr, "inflate: end\n"));
-    return Z_OK;
-}
diff --git a/src/png/zlib/contrib/infback9/infback9.h b/src/png/zlib/contrib/infback9/infback9.h
deleted file mode 100644
index 1073c0a38..000000000
--- a/src/png/zlib/contrib/infback9/infback9.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/* infback9.h -- header for using inflateBack9 functions
- * Copyright (C) 2003 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/*
- * This header file and associated patches provide a decoder for PKWare's
- * undocumented deflate64 compression method (method 9).  Use with infback9.c,
- * inftree9.h, inftree9.c, and inffix9.h.  These patches are not supported.
- * This should be compiled with zlib, since it uses zutil.h and zutil.o.
- * This code has not yet been tested on 16-bit architectures.  See the
- * comments in zlib.h for inflateBack() usage.  These functions are used
- * identically, except that there is no windowBits parameter, and a 64K
- * window must be provided.  Also if int's are 16 bits, then a zero for
- * the third parameter of the "out" function actually means 65536UL.
- * zlib.h must be included before this header file.
- */
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-ZEXTERN int ZEXPORT inflateBack9 OF((z_stream FAR *strm,
-                                    in_func in, void FAR *in_desc,
-                                    out_func out, void FAR *out_desc));
-ZEXTERN int ZEXPORT inflateBack9End OF((z_stream FAR *strm));
-ZEXTERN int ZEXPORT inflateBack9Init_ OF((z_stream FAR *strm,
-                                         unsigned char FAR *window,
-                                         const char *version,
-                                         int stream_size));
-#define inflateBack9Init(strm, window) \
-        inflateBack9Init_((strm), (window), \
-        ZLIB_VERSION, sizeof(z_stream))
-
-#ifdef __cplusplus
-}
-#endif
diff --git a/src/png/zlib/contrib/infback9/inffix9.h b/src/png/zlib/contrib/infback9/inffix9.h
deleted file mode 100644
index ee5671d2d..000000000
--- a/src/png/zlib/contrib/infback9/inffix9.h
+++ /dev/null
@@ -1,107 +0,0 @@
-    /* inffix9.h -- table for decoding deflate64 fixed codes
-     * Generated automatically by makefixed9().
-     */
-
-    /* WARNING: this file should *not* be used by applications.
-       It is part of the implementation of this library and is
-       subject to change. Applications should only use zlib.h.
-     */
-
-    static const code lenfix[512] = {
-        {96,7,0},{0,8,80},{0,8,16},{132,8,115},{130,7,31},{0,8,112},
-        {0,8,48},{0,9,192},{128,7,10},{0,8,96},{0,8,32},{0,9,160},
-        {0,8,0},{0,8,128},{0,8,64},{0,9,224},{128,7,6},{0,8,88},
-        {0,8,24},{0,9,144},{131,7,59},{0,8,120},{0,8,56},{0,9,208},
-        {129,7,17},{0,8,104},{0,8,40},{0,9,176},{0,8,8},{0,8,136},
-        {0,8,72},{0,9,240},{128,7,4},{0,8,84},{0,8,20},{133,8,227},
-        {131,7,43},{0,8,116},{0,8,52},{0,9,200},{129,7,13},{0,8,100},
-        {0,8,36},{0,9,168},{0,8,4},{0,8,132},{0,8,68},{0,9,232},
-        {128,7,8},{0,8,92},{0,8,28},{0,9,152},{132,7,83},{0,8,124},
-        {0,8,60},{0,9,216},{130,7,23},{0,8,108},{0,8,44},{0,9,184},
-        {0,8,12},{0,8,140},{0,8,76},{0,9,248},{128,7,3},{0,8,82},
-        {0,8,18},{133,8,163},{131,7,35},{0,8,114},{0,8,50},{0,9,196},
-        {129,7,11},{0,8,98},{0,8,34},{0,9,164},{0,8,2},{0,8,130},
-        {0,8,66},{0,9,228},{128,7,7},{0,8,90},{0,8,26},{0,9,148},
-        {132,7,67},{0,8,122},{0,8,58},{0,9,212},{130,7,19},{0,8,106},
-        {0,8,42},{0,9,180},{0,8,10},{0,8,138},{0,8,74},{0,9,244},
-        {128,7,5},{0,8,86},{0,8,22},{65,8,0},{131,7,51},{0,8,118},
-        {0,8,54},{0,9,204},{129,7,15},{0,8,102},{0,8,38},{0,9,172},
-        {0,8,6},{0,8,134},{0,8,70},{0,9,236},{128,7,9},{0,8,94},
-        {0,8,30},{0,9,156},{132,7,99},{0,8,126},{0,8,62},{0,9,220},
-        {130,7,27},{0,8,110},{0,8,46},{0,9,188},{0,8,14},{0,8,142},
-        {0,8,78},{0,9,252},{96,7,0},{0,8,81},{0,8,17},{133,8,131},
-        {130,7,31},{0,8,113},{0,8,49},{0,9,194},{128,7,10},{0,8,97},
-        {0,8,33},{0,9,162},{0,8,1},{0,8,129},{0,8,65},{0,9,226},
-        {128,7,6},{0,8,89},{0,8,25},{0,9,146},{131,7,59},{0,8,121},
-        {0,8,57},{0,9,210},{129,7,17},{0,8,105},{0,8,41},{0,9,178},
-        {0,8,9},{0,8,137},{0,8,73},{0,9,242},{128,7,4},{0,8,85},
-        {0,8,21},{144,8,3},{131,7,43},{0,8,117},{0,8,53},{0,9,202},
-        {129,7,13},{0,8,101},{0,8,37},{0,9,170},{0,8,5},{0,8,133},
-        {0,8,69},{0,9,234},{128,7,8},{0,8,93},{0,8,29},{0,9,154},
-        {132,7,83},{0,8,125},{0,8,61},{0,9,218},{130,7,23},{0,8,109},
-        {0,8,45},{0,9,186},{0,8,13},{0,8,141},{0,8,77},{0,9,250},
-        {128,7,3},{0,8,83},{0,8,19},{133,8,195},{131,7,35},{0,8,115},
-        {0,8,51},{0,9,198},{129,7,11},{0,8,99},{0,8,35},{0,9,166},
-        {0,8,3},{0,8,131},{0,8,67},{0,9,230},{128,7,7},{0,8,91},
-        {0,8,27},{0,9,150},{132,7,67},{0,8,123},{0,8,59},{0,9,214},
-        {130,7,19},{0,8,107},{0,8,43},{0,9,182},{0,8,11},{0,8,139},
-        {0,8,75},{0,9,246},{128,7,5},{0,8,87},{0,8,23},{77,8,0},
-        {131,7,51},{0,8,119},{0,8,55},{0,9,206},{129,7,15},{0,8,103},
-        {0,8,39},{0,9,174},{0,8,7},{0,8,135},{0,8,71},{0,9,238},
-        {128,7,9},{0,8,95},{0,8,31},{0,9,158},{132,7,99},{0,8,127},
-        {0,8,63},{0,9,222},{130,7,27},{0,8,111},{0,8,47},{0,9,190},
-        {0,8,15},{0,8,143},{0,8,79},{0,9,254},{96,7,0},{0,8,80},
-        {0,8,16},{132,8,115},{130,7,31},{0,8,112},{0,8,48},{0,9,193},
-        {128,7,10},{0,8,96},{0,8,32},{0,9,161},{0,8,0},{0,8,128},
-        {0,8,64},{0,9,225},{128,7,6},{0,8,88},{0,8,24},{0,9,145},
-        {131,7,59},{0,8,120},{0,8,56},{0,9,209},{129,7,17},{0,8,104},
-        {0,8,40},{0,9,177},{0,8,8},{0,8,136},{0,8,72},{0,9,241},
-        {128,7,4},{0,8,84},{0,8,20},{133,8,227},{131,7,43},{0,8,116},
-        {0,8,52},{0,9,201},{129,7,13},{0,8,100},{0,8,36},{0,9,169},
-        {0,8,4},{0,8,132},{0,8,68},{0,9,233},{128,7,8},{0,8,92},
-        {0,8,28},{0,9,153},{132,7,83},{0,8,124},{0,8,60},{0,9,217},
-        {130,7,23},{0,8,108},{0,8,44},{0,9,185},{0,8,12},{0,8,140},
-        {0,8,76},{0,9,249},{128,7,3},{0,8,82},{0,8,18},{133,8,163},
-        {131,7,35},{0,8,114},{0,8,50},{0,9,197},{129,7,11},{0,8,98},
-        {0,8,34},{0,9,165},{0,8,2},{0,8,130},{0,8,66},{0,9,229},
-        {128,7,7},{0,8,90},{0,8,26},{0,9,149},{132,7,67},{0,8,122},
-        {0,8,58},{0,9,213},{130,7,19},{0,8,106},{0,8,42},{0,9,181},
-        {0,8,10},{0,8,138},{0,8,74},{0,9,245},{128,7,5},{0,8,86},
-        {0,8,22},{65,8,0},{131,7,51},{0,8,118},{0,8,54},{0,9,205},
-        {129,7,15},{0,8,102},{0,8,38},{0,9,173},{0,8,6},{0,8,134},
-        {0,8,70},{0,9,237},{128,7,9},{0,8,94},{0,8,30},{0,9,157},
-        {132,7,99},{0,8,126},{0,8,62},{0,9,221},{130,7,27},{0,8,110},
-        {0,8,46},{0,9,189},{0,8,14},{0,8,142},{0,8,78},{0,9,253},
-        {96,7,0},{0,8,81},{0,8,17},{133,8,131},{130,7,31},{0,8,113},
-        {0,8,49},{0,9,195},{128,7,10},{0,8,97},{0,8,33},{0,9,163},
-        {0,8,1},{0,8,129},{0,8,65},{0,9,227},{128,7,6},{0,8,89},
-        {0,8,25},{0,9,147},{131,7,59},{0,8,121},{0,8,57},{0,9,211},
-        {129,7,17},{0,8,105},{0,8,41},{0,9,179},{0,8,9},{0,8,137},
-        {0,8,73},{0,9,243},{128,7,4},{0,8,85},{0,8,21},{144,8,3},
-        {131,7,43},{0,8,117},{0,8,53},{0,9,203},{129,7,13},{0,8,101},
-        {0,8,37},{0,9,171},{0,8,5},{0,8,133},{0,8,69},{0,9,235},
-        {128,7,8},{0,8,93},{0,8,29},{0,9,155},{132,7,83},{0,8,125},
-        {0,8,61},{0,9,219},{130,7,23},{0,8,109},{0,8,45},{0,9,187},
-        {0,8,13},{0,8,141},{0,8,77},{0,9,251},{128,7,3},{0,8,83},
-        {0,8,19},{133,8,195},{131,7,35},{0,8,115},{0,8,51},{0,9,199},
-        {129,7,11},{0,8,99},{0,8,35},{0,9,167},{0,8,3},{0,8,131},
-        {0,8,67},{0,9,231},{128,7,7},{0,8,91},{0,8,27},{0,9,151},
-        {132,7,67},{0,8,123},{0,8,59},{0,9,215},{130,7,19},{0,8,107},
-        {0,8,43},{0,9,183},{0,8,11},{0,8,139},{0,8,75},{0,9,247},
-        {128,7,5},{0,8,87},{0,8,23},{77,8,0},{131,7,51},{0,8,119},
-        {0,8,55},{0,9,207},{129,7,15},{0,8,103},{0,8,39},{0,9,175},
-        {0,8,7},{0,8,135},{0,8,71},{0,9,239},{128,7,9},{0,8,95},
-        {0,8,31},{0,9,159},{132,7,99},{0,8,127},{0,8,63},{0,9,223},
-        {130,7,27},{0,8,111},{0,8,47},{0,9,191},{0,8,15},{0,8,143},
-        {0,8,79},{0,9,255}
-    };
-
-    static const code distfix[32] = {
-        {128,5,1},{135,5,257},{131,5,17},{139,5,4097},{129,5,5},
-        {137,5,1025},{133,5,65},{141,5,16385},{128,5,3},{136,5,513},
-        {132,5,33},{140,5,8193},{130,5,9},{138,5,2049},{134,5,129},
-        {142,5,32769},{128,5,2},{135,5,385},{131,5,25},{139,5,6145},
-        {129,5,7},{137,5,1537},{133,5,97},{141,5,24577},{128,5,4},
-        {136,5,769},{132,5,49},{140,5,12289},{130,5,13},{138,5,3073},
-        {134,5,193},{142,5,49153}
-    };
diff --git a/src/png/zlib/contrib/infback9/inflate9.h b/src/png/zlib/contrib/infback9/inflate9.h
deleted file mode 100644
index ee9a79394..000000000
--- a/src/png/zlib/contrib/infback9/inflate9.h
+++ /dev/null
@@ -1,47 +0,0 @@
-/* inflate9.h -- internal inflate state definition
- * Copyright (C) 1995-2003 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* WARNING: this file should *not* be used by applications. It is
-   part of the implementation of the compression library and is
-   subject to change. Applications should only use zlib.h.
- */
-
-/* Possible inflate modes between inflate() calls */
-typedef enum {
-        TYPE,       /* i: waiting for type bits, including last-flag bit */
-        STORED,     /* i: waiting for stored size (length and complement) */
-        TABLE,      /* i: waiting for dynamic block table lengths */
-            LEN,        /* i: waiting for length/lit code */
-    DONE,       /* finished check, done -- remain here until reset */
-    BAD         /* got a data error -- remain here until reset */
-} inflate_mode;
-
-/*
-    State transitions between above modes -
-
-    (most modes can go to the BAD mode -- not shown for clarity)
-
-    Read deflate blocks:
-            TYPE -> STORED or TABLE or LEN or DONE
-            STORED -> TYPE
-            TABLE -> LENLENS -> CODELENS -> LEN
-    Read deflate codes:
-                LEN -> LEN or TYPE
- */
-
-/* state maintained between inflate() calls.  Approximately 7K bytes. */
-struct inflate_state {
-        /* sliding window */
-    unsigned char FAR *window;  /* allocated sliding window, if needed */
-        /* dynamic table building */
-    unsigned ncode;             /* number of code length code lengths */
-    unsigned nlen;              /* number of length code lengths */
-    unsigned ndist;             /* number of distance code lengths */
-    unsigned have;              /* number of code lengths in lens[] */
-    code FAR *next;             /* next available space in codes[] */
-    unsigned short lens[320];   /* temporary storage for code lengths */
-    unsigned short work[288];   /* work area for code table building */
-    code codes[ENOUGH];         /* space for code tables */
-};
diff --git a/src/png/zlib/contrib/infback9/inftree9.c b/src/png/zlib/contrib/infback9/inftree9.c
deleted file mode 100644
index 5f4a76798..000000000
--- a/src/png/zlib/contrib/infback9/inftree9.c
+++ /dev/null
@@ -1,324 +0,0 @@
-/* inftree9.c -- generate Huffman trees for efficient decoding
- * Copyright (C) 1995-2017 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-#include "zutil.h"
-#include "inftree9.h"
-
-#define MAXBITS 15
-
-const char inflate9_copyright[] =
-   " inflate9 1.2.11 Copyright 1995-2017 Mark Adler ";
-/*
-  If you use the zlib library in a product, an acknowledgment is welcome
-  in the documentation of your product. If for some reason you cannot
-  include such an acknowledgment, I would appreciate that you keep this
-  copyright string in the executable of your product.
- */
-
-/*
-   Build a set of tables to decode the provided canonical Huffman code.
-   The code lengths are lens[0..codes-1].  The result starts at *table,
-   whose indices are 0..2^bits-1.  work is a writable array of at least
-   lens shorts, which is used as a work area.  type is the type of code
-   to be generated, CODES, LENS, or DISTS.  On return, zero is success,
-   -1 is an invalid code, and +1 means that ENOUGH isn't enough.  table
-   on return points to the next available entry's address.  bits is the
-   requested root table index bits, and on return it is the actual root
-   table index bits.  It will differ if the request is greater than the
-   longest code or if it is less than the shortest code.
- */
-int inflate_table9(type, lens, codes, table, bits, work)
-codetype type;
-unsigned short FAR *lens;
-unsigned codes;
-code FAR * FAR *table;
-unsigned FAR *bits;
-unsigned short FAR *work;
-{
-    unsigned len;               /* a code's length in bits */
-    unsigned sym;               /* index of code symbols */
-    unsigned min, max;          /* minimum and maximum code lengths */
-    unsigned root;              /* number of index bits for root table */
-    unsigned curr;              /* number of index bits for current table */
-    unsigned drop;              /* code bits to drop for sub-table */
-    int left;                   /* number of prefix codes available */
-    unsigned used;              /* code entries in table used */
-    unsigned huff;              /* Huffman code */
-    unsigned incr;              /* for incrementing code, index */
-    unsigned fill;              /* index for replicating entries */
-    unsigned low;               /* low bits for current root entry */
-    unsigned mask;              /* mask for low root bits */
-    code this;                  /* table entry for duplication */
-    code FAR *next;             /* next available space in table */
-    const unsigned short FAR *base;     /* base value table to use */
-    const unsigned short FAR *extra;    /* extra bits table to use */
-    int end;                    /* use base and extra for symbol > end */
-    unsigned short count[MAXBITS+1];    /* number of codes of each length */
-    unsigned short offs[MAXBITS+1];     /* offsets in table for each length */
-    static const unsigned short lbase[31] = { /* Length codes 257..285 base */
-        3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17,
-        19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115,
-        131, 163, 195, 227, 3, 0, 0};
-    static const unsigned short lext[31] = { /* Length codes 257..285 extra */
-        128, 128, 128, 128, 128, 128, 128, 128, 129, 129, 129, 129,
-        130, 130, 130, 130, 131, 131, 131, 131, 132, 132, 132, 132,
-        133, 133, 133, 133, 144, 77, 202};
-    static const unsigned short dbase[32] = { /* Distance codes 0..31 base */
-        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49,
-        65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073,
-        4097, 6145, 8193, 12289, 16385, 24577, 32769, 49153};
-    static const unsigned short dext[32] = { /* Distance codes 0..31 extra */
-        128, 128, 128, 128, 129, 129, 130, 130, 131, 131, 132, 132,
-        133, 133, 134, 134, 135, 135, 136, 136, 137, 137, 138, 138,
-        139, 139, 140, 140, 141, 141, 142, 142};
-
-    /*
-       Process a set of code lengths to create a canonical Huffman code.  The
-       code lengths are lens[0..codes-1].  Each length corresponds to the
-       symbols 0..codes-1.  The Huffman code is generated by first sorting the
-       symbols by length from short to long, and retaining the symbol order
-       for codes with equal lengths.  Then the code starts with all zero bits
-       for the first code of the shortest length, and the codes are integer
-       increments for the same length, and zeros are appended as the length
-       increases.  For the deflate format, these bits are stored backwards
-       from their more natural integer increment ordering, and so when the
-       decoding tables are built in the large loop below, the integer codes
-       are incremented backwards.
-
-       This routine assumes, but does not check, that all of the entries in
-       lens[] are in the range 0..MAXBITS.  The caller must assure this.
-       1..MAXBITS is interpreted as that code length.  zero means that that
-       symbol does not occur in this code.
-
-       The codes are sorted by computing a count of codes for each length,
-       creating from that a table of starting indices for each length in the
-       sorted table, and then entering the symbols in order in the sorted
-       table.  The sorted table is work[], with that space being provided by
-       the caller.
-
-       The length counts are used for other purposes as well, i.e. finding
-       the minimum and maximum length codes, determining if there are any
-       codes at all, checking for a valid set of lengths, and looking ahead
-       at length counts to determine sub-table sizes when building the
-       decoding tables.
-     */
-
-    /* accumulate lengths for codes (assumes lens[] all in 0..MAXBITS) */
-    for (len = 0; len <= MAXBITS; len++)
-        count[len] = 0;
-    for (sym = 0; sym < codes; sym++)
-        count[lens[sym]]++;
-
-    /* bound code lengths, force root to be within code lengths */
-    root = *bits;
-    for (max = MAXBITS; max >= 1; max--)
-        if (count[max] != 0) break;
-    if (root > max) root = max;
-    if (max == 0) return -1;            /* no codes! */
-    for (min = 1; min <= MAXBITS; min++)
-        if (count[min] != 0) break;
-    if (root < min) root = min;
-
-    /* check for an over-subscribed or incomplete set of lengths */
-    left = 1;
-    for (len = 1; len <= MAXBITS; len++) {
-        left <<= 1;
-        left -= count[len];
-        if (left < 0) return -1;        /* over-subscribed */
-    }
-    if (left > 0 && (type == CODES || max != 1))
-        return -1;                      /* incomplete set */
-
-    /* generate offsets into symbol table for each length for sorting */
-    offs[1] = 0;
-    for (len = 1; len < MAXBITS; len++)
-        offs[len + 1] = offs[len] + count[len];
-
-    /* sort symbols by length, by symbol order within each length */
-    for (sym = 0; sym < codes; sym++)
-        if (lens[sym] != 0) work[offs[lens[sym]]++] = (unsigned short)sym;
-
-    /*
-       Create and fill in decoding tables.  In this loop, the table being
-       filled is at next and has curr index bits.  The code being used is huff
-       with length len.  That code is converted to an index by dropping drop
-       bits off of the bottom.  For codes where len is less than drop + curr,
-       those top drop + curr - len bits are incremented through all values to
-       fill the table with replicated entries.
-
-       root is the number of index bits for the root table.  When len exceeds
-       root, sub-tables are created pointed to by the root entry with an index
-       of the low root bits of huff.  This is saved in low to check for when a
-       new sub-table should be started.  drop is zero when the root table is
-       being filled, and drop is root when sub-tables are being filled.
-
-       When a new sub-table is needed, it is necessary to look ahead in the
-       code lengths to determine what size sub-table is needed.  The length
-       counts are used for this, and so count[] is decremented as codes are
-       entered in the tables.
-
-       used keeps track of how many table entries have been allocated from the
-       provided *table space.  It is checked for LENS and DIST tables against
-       the constants ENOUGH_LENS and ENOUGH_DISTS to guard against changes in
-       the initial root table size constants.  See the comments in inftree9.h
-       for more information.
-
-       sym increments through all symbols, and the loop terminates when
-       all codes of length max, i.e. all codes, have been processed.  This
-       routine permits incomplete codes, so another loop after this one fills
-       in the rest of the decoding tables with invalid code markers.
-     */
-
-    /* set up for code type */
-    switch (type) {
-    case CODES:
-        base = extra = work;    /* dummy value--not used */
-        end = 19;
-        break;
-    case LENS:
-        base = lbase;
-        base -= 257;
-        extra = lext;
-        extra -= 257;
-        end = 256;
-        break;
-    default:            /* DISTS */
-        base = dbase;
-        extra = dext;
-        end = -1;
-    }
-
-    /* initialize state for loop */
-    huff = 0;                   /* starting code */
-    sym = 0;                    /* starting code symbol */
-    len = min;                  /* starting code length */
-    next = *table;              /* current table to fill in */
-    curr = root;                /* current table index bits */
-    drop = 0;                   /* current bits to drop from code for index */
-    low = (unsigned)(-1);       /* trigger new sub-table when len > root */
-    used = 1U << root;          /* use root table entries */
-    mask = used - 1;            /* mask for comparing low */
-
-    /* check available table space */
-    if ((type == LENS && used >= ENOUGH_LENS) ||
-        (type == DISTS && used >= ENOUGH_DISTS))
-        return 1;
-
-    /* process all codes and make table entries */
-    for (;;) {
-        /* create table entry */
-        this.bits = (unsigned char)(len - drop);
-        if ((int)(work[sym]) < end) {
-            this.op = (unsigned char)0;
-            this.val = work[sym];
-        }
-        else if ((int)(work[sym]) > end) {
-            this.op = (unsigned char)(extra[work[sym]]);
-            this.val = base[work[sym]];
-        }
-        else {
-            this.op = (unsigned char)(32 + 64);         /* end of block */
-            this.val = 0;
-        }
-
-        /* replicate for those indices with low len bits equal to huff */
-        incr = 1U << (len - drop);
-        fill = 1U << curr;
-        do {
-            fill -= incr;
-            next[(huff >> drop) + fill] = this;
-        } while (fill != 0);
-
-        /* backwards increment the len-bit code huff */
-        incr = 1U << (len - 1);
-        while (huff & incr)
-            incr >>= 1;
-        if (incr != 0) {
-            huff &= incr - 1;
-            huff += incr;
-        }
-        else
-            huff = 0;
-
-        /* go to next symbol, update count, len */
-        sym++;
-        if (--(count[len]) == 0) {
-            if (len == max) break;
-            len = lens[work[sym]];
-        }
-
-        /* create new sub-table if needed */
-        if (len > root && (huff & mask) != low) {
-            /* if first time, transition to sub-tables */
-            if (drop == 0)
-                drop = root;
-
-            /* increment past last table */
-            next += 1U << curr;
-
-            /* determine length of next table */
-            curr = len - drop;
-            left = (int)(1 << curr);
-            while (curr + drop < max) {
-                left -= count[curr + drop];
-                if (left <= 0) break;
-                curr++;
-                left <<= 1;
-            }
-
-            /* check for enough space */
-            used += 1U << curr;
-            if ((type == LENS && used >= ENOUGH_LENS) ||
-                (type == DISTS && used >= ENOUGH_DISTS))
-                return 1;
-
-            /* point entry in root table to sub-table */
-            low = huff & mask;
-            (*table)[low].op = (unsigned char)curr;
-            (*table)[low].bits = (unsigned char)root;
-            (*table)[low].val = (unsigned short)(next - *table);
-        }
-    }
-
-    /*
-       Fill in rest of table for incomplete codes.  This loop is similar to the
-       loop above in incrementing huff for table indices.  It is assumed that
-       len is equal to curr + drop, so there is no loop needed to increment
-       through high index bits.  When the current sub-table is filled, the loop
-       drops back to the root table to fill in any remaining entries there.
-     */
-    this.op = (unsigned char)64;                /* invalid code marker */
-    this.bits = (unsigned char)(len - drop);
-    this.val = (unsigned short)0;
-    while (huff != 0) {
-        /* when done with sub-table, drop back to root table */
-        if (drop != 0 && (huff & mask) != low) {
-            drop = 0;
-            len = root;
-            next = *table;
-            curr = root;
-            this.bits = (unsigned char)len;
-        }
-
-        /* put invalid code marker in table */
-        next[huff >> drop] = this;
-
-        /* backwards increment the len-bit code huff */
-        incr = 1U << (len - 1);
-        while (huff & incr)
-            incr >>= 1;
-        if (incr != 0) {
-            huff &= incr - 1;
-            huff += incr;
-        }
-        else
-            huff = 0;
-    }
-
-    /* set return parameters */
-    *table += used;
-    *bits = root;
-    return 0;
-}
diff --git a/src/png/zlib/contrib/infback9/inftree9.h b/src/png/zlib/contrib/infback9/inftree9.h
deleted file mode 100644
index 5ab21f0c6..000000000
--- a/src/png/zlib/contrib/infback9/inftree9.h
+++ /dev/null
@@ -1,61 +0,0 @@
-/* inftree9.h -- header to use inftree9.c
- * Copyright (C) 1995-2008 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* WARNING: this file should *not* be used by applications. It is
-   part of the implementation of the compression library and is
-   subject to change. Applications should only use zlib.h.
- */
-
-/* Structure for decoding tables.  Each entry provides either the
-   information needed to do the operation requested by the code that
-   indexed that table entry, or it provides a pointer to another
-   table that indexes more bits of the code.  op indicates whether
-   the entry is a pointer to another table, a literal, a length or
-   distance, an end-of-block, or an invalid code.  For a table
-   pointer, the low four bits of op is the number of index bits of
-   that table.  For a length or distance, the low four bits of op
-   is the number of extra bits to get after the code.  bits is
-   the number of bits in this code or part of the code to drop off
-   of the bit buffer.  val is the actual byte to output in the case
-   of a literal, the base length or distance, or the offset from
-   the current table to the next table.  Each entry is four bytes. */
-typedef struct {
-    unsigned char op;           /* operation, extra bits, table bits */
-    unsigned char bits;         /* bits in this part of the code */
-    unsigned short val;         /* offset in table or code value */
-} code;
-
-/* op values as set by inflate_table():
-    00000000 - literal
-    0000tttt - table link, tttt != 0 is the number of table index bits
-    100eeeee - length or distance, eeee is the number of extra bits
-    01100000 - end of block
-    01000000 - invalid code
- */
-
-/* Maximum size of the dynamic table.  The maximum number of code structures is
-   1446, which is the sum of 852 for literal/length codes and 594 for distance
-   codes.  These values were found by exhaustive searches using the program
-   examples/enough.c found in the zlib distribtution.  The arguments to that
-   program are the number of symbols, the initial root table size, and the
-   maximum bit length of a code.  "enough 286 9 15" for literal/length codes
-   returns returns 852, and "enough 32 6 15" for distance codes returns 594.
-   The initial root table size (9 or 6) is found in the fifth argument of the
-   inflate_table() calls in infback9.c.  If the root table size is changed,
-   then these maximum sizes would be need to be recalculated and updated. */
-#define ENOUGH_LENS 852
-#define ENOUGH_DISTS 594
-#define ENOUGH (ENOUGH_LENS+ENOUGH_DISTS)
-
-/* Type of code to build for inflate_table9() */
-typedef enum {
-    CODES,
-    LENS,
-    DISTS
-} codetype;
-
-extern int inflate_table9 OF((codetype type, unsigned short FAR *lens,
-                             unsigned codes, code FAR * FAR *table,
-                             unsigned FAR *bits, unsigned short FAR *work));
diff --git a/src/png/zlib/contrib/inflate86/inffas86.c b/src/png/zlib/contrib/inflate86/inffas86.c
deleted file mode 100644
index 7292f67b7..000000000
--- a/src/png/zlib/contrib/inflate86/inffas86.c
+++ /dev/null
@@ -1,1157 +0,0 @@
-/* inffas86.c is a hand tuned assembler version of
- *
- * inffast.c -- fast decoding
- * Copyright (C) 1995-2003 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- *
- * Copyright (C) 2003 Chris Anderson <christop@charm.net>
- * Please use the copyright conditions above.
- *
- * Dec-29-2003 -- I added AMD64 inflate asm support.  This version is also
- * slightly quicker on x86 systems because, instead of using rep movsb to copy
- * data, it uses rep movsw, which moves data in 2-byte chunks instead of single
- * bytes.  I've tested the AMD64 code on a Fedora Core 1 + the x86_64 updates
- * from http://fedora.linux.duke.edu/fc1_x86_64
- * which is running on an Athlon 64 3000+ / Gigabyte GA-K8VT800M system with
- * 1GB ram.  The 64-bit version is about 4% faster than the 32-bit version,
- * when decompressing mozilla-source-1.3.tar.gz.
- *
- * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
- * the gcc -S output of zlib-1.2.0/inffast.c.  Zlib-1.2.0 is in beta release at
- * the moment.  I have successfully compiled and tested this code with gcc2.96,
- * gcc3.2, icc5.0, msvc6.0.  It is very close to the speed of inffast.S
- * compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX
- * enabled.  I will attempt to merge the MMX code into this version.  Newer
- * versions of this and inffast.S can be found at
- * http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/
- */
-
-#include "zutil.h"
-#include "inftrees.h"
-#include "inflate.h"
-#include "inffast.h"
-
-/* Mark Adler's comments from inffast.c: */
-
-/*
-   Decode literal, length, and distance codes and write out the resulting
-   literal and match bytes until either not enough input or output is
-   available, an end-of-block is encountered, or a data error is encountered.
-   When large enough input and output buffers are supplied to inflate(), for
-   example, a 16K input buffer and a 64K output buffer, more than 95% of the
-   inflate execution time is spent in this routine.
-
-   Entry assumptions:
-
-        state->mode == LEN
-        strm->avail_in >= 6
-        strm->avail_out >= 258
-        start >= strm->avail_out
-        state->bits < 8
-
-   On return, state->mode is one of:
-
-        LEN -- ran out of enough output space or enough available input
-        TYPE -- reached end of block code, inflate() to interpret next block
-        BAD -- error in block data
-
-   Notes:
-
-    - The maximum input bits used by a length/distance pair is 15 bits for the
-      length code, 5 bits for the length extra, 15 bits for the distance code,
-      and 13 bits for the distance extra.  This totals 48 bits, or six bytes.
-      Therefore if strm->avail_in >= 6, then there is enough input to avoid
-      checking for available input while decoding.
-
-    - The maximum bytes that a single length/distance pair can output is 258
-      bytes, which is the maximum length that can be coded.  inflate_fast()
-      requires strm->avail_out >= 258 for each loop to avoid checking for
-      output space.
- */
-void inflate_fast(strm, start)
-z_streamp strm;
-unsigned start;         /* inflate()'s starting value for strm->avail_out */
-{
-    struct inflate_state FAR *state;
-    struct inffast_ar {
-/* 64   32                               x86  x86_64 */
-/* ar offset                              register */
-/*  0    0 */ void *esp;                /* esp save */
-/*  8    4 */ void *ebp;                /* ebp save */
-/* 16    8 */ unsigned char FAR *in;    /* esi rsi  local strm->next_in */
-/* 24   12 */ unsigned char FAR *last;  /*     r9   while in < last */
-/* 32   16 */ unsigned char FAR *out;   /* edi rdi  local strm->next_out */
-/* 40   20 */ unsigned char FAR *beg;   /*          inflate()'s init next_out */
-/* 48   24 */ unsigned char FAR *end;   /*     r10  while out < end */
-/* 56   28 */ unsigned char FAR *window;/*          size of window, wsize!=0 */
-/* 64   32 */ code const FAR *lcode;    /* ebp rbp  local strm->lencode */
-/* 72   36 */ code const FAR *dcode;    /*     r11  local strm->distcode */
-/* 80   40 */ unsigned long hold;       /* edx rdx  local strm->hold */
-/* 88   44 */ unsigned bits;            /* ebx rbx  local strm->bits */
-/* 92   48 */ unsigned wsize;           /*          window size */
-/* 96   52 */ unsigned write;           /*          window write index */
-/*100   56 */ unsigned lmask;           /*     r12  mask for lcode */
-/*104   60 */ unsigned dmask;           /*     r13  mask for dcode */
-/*108   64 */ unsigned len;             /*     r14  match length */
-/*112   68 */ unsigned dist;            /*     r15  match distance */
-/*116   72 */ unsigned status;          /*          set when state chng*/
-    } ar;
-
-#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
-#define PAD_AVAIL_IN 6
-#define PAD_AVAIL_OUT 258
-#else
-#define PAD_AVAIL_IN 5
-#define PAD_AVAIL_OUT 257
-#endif
-
-    /* copy state to local variables */
-    state = (struct inflate_state FAR *)strm->state;
-    ar.in = strm->next_in;
-    ar.last = ar.in + (strm->avail_in - PAD_AVAIL_IN);
-    ar.out = strm->next_out;
-    ar.beg = ar.out - (start - strm->avail_out);
-    ar.end = ar.out + (strm->avail_out - PAD_AVAIL_OUT);
-    ar.wsize = state->wsize;
-    ar.write = state->wnext;
-    ar.window = state->window;
-    ar.hold = state->hold;
-    ar.bits = state->bits;
-    ar.lcode = state->lencode;
-    ar.dcode = state->distcode;
-    ar.lmask = (1U << state->lenbits) - 1;
-    ar.dmask = (1U << state->distbits) - 1;
-
-    /* decode literals and length/distances until end-of-block or not enough
-       input data or output space */
-
-    /* align in on 1/2 hold size boundary */
-    while (((unsigned long)(void *)ar.in & (sizeof(ar.hold) / 2 - 1)) != 0) {
-        ar.hold += (unsigned long)*ar.in++ << ar.bits;
-        ar.bits += 8;
-    }
-
-#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
-    __asm__ __volatile__ (
-"        leaq    %0, %%rax\n"
-"        movq    %%rbp, 8(%%rax)\n"       /* save regs rbp and rsp */
-"        movq    %%rsp, (%%rax)\n"
-"        movq    %%rax, %%rsp\n"          /* make rsp point to &ar */
-"        movq    16(%%rsp), %%rsi\n"      /* rsi  = in */
-"        movq    32(%%rsp), %%rdi\n"      /* rdi  = out */
-"        movq    24(%%rsp), %%r9\n"       /* r9   = last */
-"        movq    48(%%rsp), %%r10\n"      /* r10  = end */
-"        movq    64(%%rsp), %%rbp\n"      /* rbp  = lcode */
-"        movq    72(%%rsp), %%r11\n"      /* r11  = dcode */
-"        movq    80(%%rsp), %%rdx\n"      /* rdx  = hold */
-"        movl    88(%%rsp), %%ebx\n"      /* ebx  = bits */
-"        movl    100(%%rsp), %%r12d\n"    /* r12d = lmask */
-"        movl    104(%%rsp), %%r13d\n"    /* r13d = dmask */
-                                          /* r14d = len */
-                                          /* r15d = dist */
-"        cld\n"
-"        cmpq    %%rdi, %%r10\n"
-"        je      .L_one_time\n"           /* if only one decode left */
-"        cmpq    %%rsi, %%r9\n"
-"        je      .L_one_time\n"
-"        jmp     .L_do_loop\n"
-
-".L_one_time:\n"
-"        movq    %%r12, %%r8\n"           /* r8 = lmask */
-"        cmpb    $32, %%bl\n"
-"        ja      .L_get_length_code_one_time\n"
-
-"        lodsl\n"                         /* eax = *(uint *)in++ */
-"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
-"        addb    $32, %%bl\n"             /* bits += 32 */
-"        shlq    %%cl, %%rax\n"
-"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
-"        jmp     .L_get_length_code_one_time\n"
-
-".align 32,0x90\n"
-".L_while_test:\n"
-"        cmpq    %%rdi, %%r10\n"
-"        jbe     .L_break_loop\n"
-"        cmpq    %%rsi, %%r9\n"
-"        jbe     .L_break_loop\n"
-
-".L_do_loop:\n"
-"        movq    %%r12, %%r8\n"           /* r8 = lmask */
-"        cmpb    $32, %%bl\n"
-"        ja      .L_get_length_code\n"    /* if (32 < bits) */
-
-"        lodsl\n"                         /* eax = *(uint *)in++ */
-"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
-"        addb    $32, %%bl\n"             /* bits += 32 */
-"        shlq    %%cl, %%rax\n"
-"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
-
-".L_get_length_code:\n"
-"        andq    %%rdx, %%r8\n"            /* r8 &= hold */
-"        movl    (%%rbp,%%r8,4), %%eax\n"  /* eax = lcode[hold & lmask] */
-
-"        movb    %%ah, %%cl\n"            /* cl = this.bits */
-"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
-"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
-
-"        testb   %%al, %%al\n"
-"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */
-
-"        movq    %%r12, %%r8\n"            /* r8 = lmask */
-"        shrl    $16, %%eax\n"            /* output this.val char */
-"        stosb\n"
-
-".L_get_length_code_one_time:\n"
-"        andq    %%rdx, %%r8\n"            /* r8 &= hold */
-"        movl    (%%rbp,%%r8,4), %%eax\n" /* eax = lcode[hold & lmask] */
-
-".L_dolen:\n"
-"        movb    %%ah, %%cl\n"            /* cl = this.bits */
-"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
-"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
-
-"        testb   %%al, %%al\n"
-"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */
-
-"        shrl    $16, %%eax\n"            /* output this.val char */
-"        stosb\n"
-"        jmp     .L_while_test\n"
-
-".align 32,0x90\n"
-".L_test_for_length_base:\n"
-"        movl    %%eax, %%r14d\n"         /* len = this */
-"        shrl    $16, %%r14d\n"           /* len = this.val */
-"        movb    %%al, %%cl\n"
-
-"        testb   $16, %%al\n"
-"        jz      .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
-"        andb    $15, %%cl\n"             /* op &= 15 */
-"        jz      .L_decode_distance\n"    /* if (!op) */
-
-".L_add_bits_to_len:\n"
-"        subb    %%cl, %%bl\n"
-"        xorl    %%eax, %%eax\n"
-"        incl    %%eax\n"
-"        shll    %%cl, %%eax\n"
-"        decl    %%eax\n"
-"        andl    %%edx, %%eax\n"          /* eax &= hold */
-"        shrq    %%cl, %%rdx\n"
-"        addl    %%eax, %%r14d\n"         /* len += hold & mask[op] */
-
-".L_decode_distance:\n"
-"        movq    %%r13, %%r8\n"           /* r8 = dmask */
-"        cmpb    $32, %%bl\n"
-"        ja      .L_get_distance_code\n"  /* if (32 < bits) */
-
-"        lodsl\n"                         /* eax = *(uint *)in++ */
-"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
-"        addb    $32, %%bl\n"             /* bits += 32 */
-"        shlq    %%cl, %%rax\n"
-"        orq     %%rax, %%rdx\n"          /* hold |= *((uint *)in)++ << bits */
-
-".L_get_distance_code:\n"
-"        andq    %%rdx, %%r8\n"           /* r8 &= hold */
-"        movl    (%%r11,%%r8,4), %%eax\n" /* eax = dcode[hold & dmask] */
-
-".L_dodist:\n"
-"        movl    %%eax, %%r15d\n"         /* dist = this */
-"        shrl    $16, %%r15d\n"           /* dist = this.val */
-"        movb    %%ah, %%cl\n"
-"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
-"        shrq    %%cl, %%rdx\n"           /* hold >>= this.bits */
-"        movb    %%al, %%cl\n"            /* cl = this.op */
-
-"        testb   $16, %%al\n"             /* if ((op & 16) == 0) */
-"        jz      .L_test_for_second_level_dist\n"
-"        andb    $15, %%cl\n"             /* op &= 15 */
-"        jz      .L_check_dist_one\n"
-
-".L_add_bits_to_dist:\n"
-"        subb    %%cl, %%bl\n"
-"        xorl    %%eax, %%eax\n"
-"        incl    %%eax\n"
-"        shll    %%cl, %%eax\n"
-"        decl    %%eax\n"                 /* (1 << op) - 1 */
-"        andl    %%edx, %%eax\n"          /* eax &= hold */
-"        shrq    %%cl, %%rdx\n"
-"        addl    %%eax, %%r15d\n"         /* dist += hold & ((1 << op) - 1) */
-
-".L_check_window:\n"
-"        movq    %%rsi, %%r8\n"           /* save in so from can use it's reg */
-"        movq    %%rdi, %%rax\n"
-"        subq    40(%%rsp), %%rax\n"      /* nbytes = out - beg */
-
-"        cmpl    %%r15d, %%eax\n"
-"        jb      .L_clip_window\n"        /* if (dist > nbytes) 4.2% */
-
-"        movl    %%r14d, %%ecx\n"         /* ecx = len */
-"        movq    %%rdi, %%rsi\n"
-"        subq    %%r15, %%rsi\n"          /* from = out - dist */
-
-"        sarl    %%ecx\n"
-"        jnc     .L_copy_two\n"           /* if len % 2 == 0 */
-
-"        rep     movsw\n"
-"        movb    (%%rsi), %%al\n"
-"        movb    %%al, (%%rdi)\n"
-"        incq    %%rdi\n"
-
-"        movq    %%r8, %%rsi\n"           /* move in back to %rsi, toss from */
-"        jmp     .L_while_test\n"
-
-".L_copy_two:\n"
-"        rep     movsw\n"
-"        movq    %%r8, %%rsi\n"           /* move in back to %rsi, toss from */
-"        jmp     .L_while_test\n"
-
-".align 32,0x90\n"
-".L_check_dist_one:\n"
-"        cmpl    $1, %%r15d\n"            /* if dist 1, is a memset */
-"        jne     .L_check_window\n"
-"        cmpq    %%rdi, 40(%%rsp)\n"      /* if out == beg, outside window */
-"        je      .L_check_window\n"
-
-"        movl    %%r14d, %%ecx\n"         /* ecx = len */
-"        movb    -1(%%rdi), %%al\n"
-"        movb    %%al, %%ah\n"
-
-"        sarl    %%ecx\n"
-"        jnc     .L_set_two\n"
-"        movb    %%al, (%%rdi)\n"
-"        incq    %%rdi\n"
-
-".L_set_two:\n"
-"        rep     stosw\n"
-"        jmp     .L_while_test\n"
-
-".align 32,0x90\n"
-".L_test_for_second_level_length:\n"
-"        testb   $64, %%al\n"
-"        jnz     .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */
-
-"        xorl    %%eax, %%eax\n"
-"        incl    %%eax\n"
-"        shll    %%cl, %%eax\n"
-"        decl    %%eax\n"
-"        andl    %%edx, %%eax\n"         /* eax &= hold */
-"        addl    %%r14d, %%eax\n"        /* eax += len */
-"        movl    (%%rbp,%%rax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
-"        jmp     .L_dolen\n"
-
-".align 32,0x90\n"
-".L_test_for_second_level_dist:\n"
-"        testb   $64, %%al\n"
-"        jnz     .L_invalid_distance_code\n" /* if ((op & 64) != 0) */
-
-"        xorl    %%eax, %%eax\n"
-"        incl    %%eax\n"
-"        shll    %%cl, %%eax\n"
-"        decl    %%eax\n"
-"        andl    %%edx, %%eax\n"         /* eax &= hold */
-"        addl    %%r15d, %%eax\n"        /* eax += dist */
-"        movl    (%%r11,%%rax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
-"        jmp     .L_dodist\n"
-
-".align 32,0x90\n"
-".L_clip_window:\n"
-"        movl    %%eax, %%ecx\n"         /* ecx = nbytes */
-"        movl    92(%%rsp), %%eax\n"     /* eax = wsize, prepare for dist cmp */
-"        negl    %%ecx\n"                /* nbytes = -nbytes */
-
-"        cmpl    %%r15d, %%eax\n"
-"        jb      .L_invalid_distance_too_far\n" /* if (dist > wsize) */
-
-"        addl    %%r15d, %%ecx\n"         /* nbytes = dist - nbytes */
-"        cmpl    $0, 96(%%rsp)\n"
-"        jne     .L_wrap_around_window\n" /* if (write != 0) */
-
-"        movq    56(%%rsp), %%rsi\n"     /* from  = window */
-"        subl    %%ecx, %%eax\n"         /* eax  -= nbytes */
-"        addq    %%rax, %%rsi\n"         /* from += wsize - nbytes */
-
-"        movl    %%r14d, %%eax\n"        /* eax = len */
-"        cmpl    %%ecx, %%r14d\n"
-"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
-
-"        subl    %%ecx, %%eax\n"         /* eax -= nbytes */
-"        rep     movsb\n"
-"        movq    %%rdi, %%rsi\n"
-"        subq    %%r15, %%rsi\n"         /* from = &out[ -dist ] */
-"        jmp     .L_do_copy\n"
-
-".align 32,0x90\n"
-".L_wrap_around_window:\n"
-"        movl    96(%%rsp), %%eax\n"     /* eax = write */
-"        cmpl    %%eax, %%ecx\n"
-"        jbe     .L_contiguous_in_window\n" /* if (write >= nbytes) */
-
-"        movl    92(%%rsp), %%esi\n"     /* from  = wsize */
-"        addq    56(%%rsp), %%rsi\n"     /* from += window */
-"        addq    %%rax, %%rsi\n"         /* from += write */
-"        subq    %%rcx, %%rsi\n"         /* from -= nbytes */
-"        subl    %%eax, %%ecx\n"         /* nbytes -= write */
-
-"        movl    %%r14d, %%eax\n"        /* eax = len */
-"        cmpl    %%ecx, %%eax\n"
-"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
-
-"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
-"        rep     movsb\n"
-"        movq    56(%%rsp), %%rsi\n"     /* from = window */
-"        movl    96(%%rsp), %%ecx\n"     /* nbytes = write */
-"        cmpl    %%ecx, %%eax\n"
-"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
-
-"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
-"        rep     movsb\n"
-"        movq    %%rdi, %%rsi\n"
-"        subq    %%r15, %%rsi\n"         /* from = out - dist */
-"        jmp     .L_do_copy\n"
-
-".align 32,0x90\n"
-".L_contiguous_in_window:\n"
-"        movq    56(%%rsp), %%rsi\n"     /* rsi = window */
-"        addq    %%rax, %%rsi\n"
-"        subq    %%rcx, %%rsi\n"         /* from += write - nbytes */
-
-"        movl    %%r14d, %%eax\n"        /* eax = len */
-"        cmpl    %%ecx, %%eax\n"
-"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
-
-"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
-"        rep     movsb\n"
-"        movq    %%rdi, %%rsi\n"
-"        subq    %%r15, %%rsi\n"         /* from = out - dist */
-"        jmp     .L_do_copy\n"           /* if (nbytes >= len) */
-
-".align 32,0x90\n"
-".L_do_copy:\n"
-"        movl    %%eax, %%ecx\n"         /* ecx = len */
-"        rep     movsb\n"
-
-"        movq    %%r8, %%rsi\n"          /* move in back to %esi, toss from */
-"        jmp     .L_while_test\n"
-
-".L_test_for_end_of_block:\n"
-"        testb   $32, %%al\n"
-"        jz      .L_invalid_literal_length_code\n"
-"        movl    $1, 116(%%rsp)\n"
-"        jmp     .L_break_loop_with_status\n"
-
-".L_invalid_literal_length_code:\n"
-"        movl    $2, 116(%%rsp)\n"
-"        jmp     .L_break_loop_with_status\n"
-
-".L_invalid_distance_code:\n"
-"        movl    $3, 116(%%rsp)\n"
-"        jmp     .L_break_loop_with_status\n"
-
-".L_invalid_distance_too_far:\n"
-"        movl    $4, 116(%%rsp)\n"
-"        jmp     .L_break_loop_with_status\n"
-
-".L_break_loop:\n"
-"        movl    $0, 116(%%rsp)\n"
-
-".L_break_loop_with_status:\n"
-/* put in, out, bits, and hold back into ar and pop esp */
-"        movq    %%rsi, 16(%%rsp)\n"     /* in */
-"        movq    %%rdi, 32(%%rsp)\n"     /* out */
-"        movl    %%ebx, 88(%%rsp)\n"     /* bits */
-"        movq    %%rdx, 80(%%rsp)\n"     /* hold */
-"        movq    (%%rsp), %%rax\n"       /* restore rbp and rsp */
-"        movq    8(%%rsp), %%rbp\n"
-"        movq    %%rax, %%rsp\n"
-          :
-          : "m" (ar)
-          : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
-            "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
-    );
-#elif ( defined( __GNUC__ ) || defined( __ICC ) ) && defined( __i386 )
-    __asm__ __volatile__ (
-"        leal    %0, %%eax\n"
-"        movl    %%esp, (%%eax)\n"        /* save esp, ebp */
-"        movl    %%ebp, 4(%%eax)\n"
-"        movl    %%eax, %%esp\n"
-"        movl    8(%%esp), %%esi\n"       /* esi = in */
-"        movl    16(%%esp), %%edi\n"      /* edi = out */
-"        movl    40(%%esp), %%edx\n"      /* edx = hold */
-"        movl    44(%%esp), %%ebx\n"      /* ebx = bits */
-"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
-
-"        cld\n"
-"        jmp     .L_do_loop\n"
-
-".align 32,0x90\n"
-".L_while_test:\n"
-"        cmpl    %%edi, 24(%%esp)\n"      /* out < end */
-"        jbe     .L_break_loop\n"
-"        cmpl    %%esi, 12(%%esp)\n"      /* in < last */
-"        jbe     .L_break_loop\n"
-
-".L_do_loop:\n"
-"        cmpb    $15, %%bl\n"
-"        ja      .L_get_length_code\n"    /* if (15 < bits) */
-
-"        xorl    %%eax, %%eax\n"
-"        lodsw\n"                         /* al = *(ushort *)in++ */
-"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
-"        addb    $16, %%bl\n"             /* bits += 16 */
-"        shll    %%cl, %%eax\n"
-"        orl     %%eax, %%edx\n"        /* hold |= *((ushort *)in)++ << bits */
-
-".L_get_length_code:\n"
-"        movl    56(%%esp), %%eax\n"      /* eax = lmask */
-"        andl    %%edx, %%eax\n"          /* eax &= hold */
-"        movl    (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[hold & lmask] */
-
-".L_dolen:\n"
-"        movb    %%ah, %%cl\n"            /* cl = this.bits */
-"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
-"        shrl    %%cl, %%edx\n"           /* hold >>= this.bits */
-
-"        testb   %%al, %%al\n"
-"        jnz     .L_test_for_length_base\n" /* if (op != 0) 45.7% */
-
-"        shrl    $16, %%eax\n"            /* output this.val char */
-"        stosb\n"
-"        jmp     .L_while_test\n"
-
-".align 32,0x90\n"
-".L_test_for_length_base:\n"
-"        movl    %%eax, %%ecx\n"          /* len = this */
-"        shrl    $16, %%ecx\n"            /* len = this.val */
-"        movl    %%ecx, 64(%%esp)\n"      /* save len */
-"        movb    %%al, %%cl\n"
-
-"        testb   $16, %%al\n"
-"        jz      .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
-"        andb    $15, %%cl\n"             /* op &= 15 */
-"        jz      .L_decode_distance\n"    /* if (!op) */
-"        cmpb    %%cl, %%bl\n"
-"        jae     .L_add_bits_to_len\n"    /* if (op <= bits) */
-
-"        movb    %%cl, %%ch\n"            /* stash op in ch, freeing cl */
-"        xorl    %%eax, %%eax\n"
-"        lodsw\n"                         /* al = *(ushort *)in++ */
-"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
-"        addb    $16, %%bl\n"             /* bits += 16 */
-"        shll    %%cl, %%eax\n"
-"        orl     %%eax, %%edx\n"         /* hold |= *((ushort *)in)++ << bits */
-"        movb    %%ch, %%cl\n"            /* move op back to ecx */
-
-".L_add_bits_to_len:\n"
-"        subb    %%cl, %%bl\n"
-"        xorl    %%eax, %%eax\n"
-"        incl    %%eax\n"
-"        shll    %%cl, %%eax\n"
-"        decl    %%eax\n"
-"        andl    %%edx, %%eax\n"          /* eax &= hold */
-"        shrl    %%cl, %%edx\n"
-"        addl    %%eax, 64(%%esp)\n"      /* len += hold & mask[op] */
-
-".L_decode_distance:\n"
-"        cmpb    $15, %%bl\n"
-"        ja      .L_get_distance_code\n"  /* if (15 < bits) */
-
-"        xorl    %%eax, %%eax\n"
-"        lodsw\n"                         /* al = *(ushort *)in++ */
-"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
-"        addb    $16, %%bl\n"             /* bits += 16 */
-"        shll    %%cl, %%eax\n"
-"        orl     %%eax, %%edx\n"         /* hold |= *((ushort *)in)++ << bits */
-
-".L_get_distance_code:\n"
-"        movl    60(%%esp), %%eax\n"      /* eax = dmask */
-"        movl    36(%%esp), %%ecx\n"      /* ecx = dcode */
-"        andl    %%edx, %%eax\n"          /* eax &= hold */
-"        movl    (%%ecx,%%eax,4), %%eax\n"/* eax = dcode[hold & dmask] */
-
-".L_dodist:\n"
-"        movl    %%eax, %%ebp\n"          /* dist = this */
-"        shrl    $16, %%ebp\n"            /* dist = this.val */
-"        movb    %%ah, %%cl\n"
-"        subb    %%ah, %%bl\n"            /* bits -= this.bits */
-"        shrl    %%cl, %%edx\n"           /* hold >>= this.bits */
-"        movb    %%al, %%cl\n"            /* cl = this.op */
-
-"        testb   $16, %%al\n"             /* if ((op & 16) == 0) */
-"        jz      .L_test_for_second_level_dist\n"
-"        andb    $15, %%cl\n"             /* op &= 15 */
-"        jz      .L_check_dist_one\n"
-"        cmpb    %%cl, %%bl\n"
-"        jae     .L_add_bits_to_dist\n"   /* if (op <= bits) 97.6% */
-
-"        movb    %%cl, %%ch\n"            /* stash op in ch, freeing cl */
-"        xorl    %%eax, %%eax\n"
-"        lodsw\n"                         /* al = *(ushort *)in++ */
-"        movb    %%bl, %%cl\n"            /* cl = bits, needs it for shifting */
-"        addb    $16, %%bl\n"             /* bits += 16 */
-"        shll    %%cl, %%eax\n"
-"        orl     %%eax, %%edx\n"        /* hold |= *((ushort *)in)++ << bits */
-"        movb    %%ch, %%cl\n"            /* move op back to ecx */
-
-".L_add_bits_to_dist:\n"
-"        subb    %%cl, %%bl\n"
-"        xorl    %%eax, %%eax\n"
-"        incl    %%eax\n"
-"        shll    %%cl, %%eax\n"
-"        decl    %%eax\n"                 /* (1 << op) - 1 */
-"        andl    %%edx, %%eax\n"          /* eax &= hold */
-"        shrl    %%cl, %%edx\n"
-"        addl    %%eax, %%ebp\n"          /* dist += hold & ((1 << op) - 1) */
-
-".L_check_window:\n"
-"        movl    %%esi, 8(%%esp)\n"       /* save in so from can use it's reg */
-"        movl    %%edi, %%eax\n"
-"        subl    20(%%esp), %%eax\n"      /* nbytes = out - beg */
-
-"        cmpl    %%ebp, %%eax\n"
-"        jb      .L_clip_window\n"        /* if (dist > nbytes) 4.2% */
-
-"        movl    64(%%esp), %%ecx\n"      /* ecx = len */
-"        movl    %%edi, %%esi\n"
-"        subl    %%ebp, %%esi\n"          /* from = out - dist */
-
-"        sarl    %%ecx\n"
-"        jnc     .L_copy_two\n"           /* if len % 2 == 0 */
-
-"        rep     movsw\n"
-"        movb    (%%esi), %%al\n"
-"        movb    %%al, (%%edi)\n"
-"        incl    %%edi\n"
-
-"        movl    8(%%esp), %%esi\n"       /* move in back to %esi, toss from */
-"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
-"        jmp     .L_while_test\n"
-
-".L_copy_two:\n"
-"        rep     movsw\n"
-"        movl    8(%%esp), %%esi\n"       /* move in back to %esi, toss from */
-"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
-"        jmp     .L_while_test\n"
-
-".align 32,0x90\n"
-".L_check_dist_one:\n"
-"        cmpl    $1, %%ebp\n"            /* if dist 1, is a memset */
-"        jne     .L_check_window\n"
-"        cmpl    %%edi, 20(%%esp)\n"
-"        je      .L_check_window\n"      /* out == beg, if outside window */
-
-"        movl    64(%%esp), %%ecx\n"      /* ecx = len */
-"        movb    -1(%%edi), %%al\n"
-"        movb    %%al, %%ah\n"
-
-"        sarl    %%ecx\n"
-"        jnc     .L_set_two\n"
-"        movb    %%al, (%%edi)\n"
-"        incl    %%edi\n"
-
-".L_set_two:\n"
-"        rep     stosw\n"
-"        movl    32(%%esp), %%ebp\n"      /* ebp = lcode */
-"        jmp     .L_while_test\n"
-
-".align 32,0x90\n"
-".L_test_for_second_level_length:\n"
-"        testb   $64, %%al\n"
-"        jnz     .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */
-
-"        xorl    %%eax, %%eax\n"
-"        incl    %%eax\n"
-"        shll    %%cl, %%eax\n"
-"        decl    %%eax\n"
-"        andl    %%edx, %%eax\n"         /* eax &= hold */
-"        addl    64(%%esp), %%eax\n"     /* eax += len */
-"        movl    (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
-"        jmp     .L_dolen\n"
-
-".align 32,0x90\n"
-".L_test_for_second_level_dist:\n"
-"        testb   $64, %%al\n"
-"        jnz     .L_invalid_distance_code\n" /* if ((op & 64) != 0) */
-
-"        xorl    %%eax, %%eax\n"
-"        incl    %%eax\n"
-"        shll    %%cl, %%eax\n"
-"        decl    %%eax\n"
-"        andl    %%edx, %%eax\n"         /* eax &= hold */
-"        addl    %%ebp, %%eax\n"         /* eax += dist */
-"        movl    36(%%esp), %%ecx\n"     /* ecx = dcode */
-"        movl    (%%ecx,%%eax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
-"        jmp     .L_dodist\n"
-
-".align 32,0x90\n"
-".L_clip_window:\n"
-"        movl    %%eax, %%ecx\n"
-"        movl    48(%%esp), %%eax\n"     /* eax = wsize */
-"        negl    %%ecx\n"                /* nbytes = -nbytes */
-"        movl    28(%%esp), %%esi\n"     /* from = window */
-
-"        cmpl    %%ebp, %%eax\n"
-"        jb      .L_invalid_distance_too_far\n" /* if (dist > wsize) */
-
-"        addl    %%ebp, %%ecx\n"         /* nbytes = dist - nbytes */
-"        cmpl    $0, 52(%%esp)\n"
-"        jne     .L_wrap_around_window\n" /* if (write != 0) */
-
-"        subl    %%ecx, %%eax\n"
-"        addl    %%eax, %%esi\n"         /* from += wsize - nbytes */
-
-"        movl    64(%%esp), %%eax\n"     /* eax = len */
-"        cmpl    %%ecx, %%eax\n"
-"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
-
-"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
-"        rep     movsb\n"
-"        movl    %%edi, %%esi\n"
-"        subl    %%ebp, %%esi\n"         /* from = out - dist */
-"        jmp     .L_do_copy\n"
-
-".align 32,0x90\n"
-".L_wrap_around_window:\n"
-"        movl    52(%%esp), %%eax\n"     /* eax = write */
-"        cmpl    %%eax, %%ecx\n"
-"        jbe     .L_contiguous_in_window\n" /* if (write >= nbytes) */
-
-"        addl    48(%%esp), %%esi\n"     /* from += wsize */
-"        addl    %%eax, %%esi\n"         /* from += write */
-"        subl    %%ecx, %%esi\n"         /* from -= nbytes */
-"        subl    %%eax, %%ecx\n"         /* nbytes -= write */
-
-"        movl    64(%%esp), %%eax\n"     /* eax = len */
-"        cmpl    %%ecx, %%eax\n"
-"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
-
-"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
-"        rep     movsb\n"
-"        movl    28(%%esp), %%esi\n"     /* from = window */
-"        movl    52(%%esp), %%ecx\n"     /* nbytes = write */
-"        cmpl    %%ecx, %%eax\n"
-"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
-
-"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
-"        rep     movsb\n"
-"        movl    %%edi, %%esi\n"
-"        subl    %%ebp, %%esi\n"         /* from = out - dist */
-"        jmp     .L_do_copy\n"
-
-".align 32,0x90\n"
-".L_contiguous_in_window:\n"
-"        addl    %%eax, %%esi\n"
-"        subl    %%ecx, %%esi\n"         /* from += write - nbytes */
-
-"        movl    64(%%esp), %%eax\n"     /* eax = len */
-"        cmpl    %%ecx, %%eax\n"
-"        jbe     .L_do_copy\n"           /* if (nbytes >= len) */
-
-"        subl    %%ecx, %%eax\n"         /* len -= nbytes */
-"        rep     movsb\n"
-"        movl    %%edi, %%esi\n"
-"        subl    %%ebp, %%esi\n"         /* from = out - dist */
-"        jmp     .L_do_copy\n"           /* if (nbytes >= len) */
-
-".align 32,0x90\n"
-".L_do_copy:\n"
-"        movl    %%eax, %%ecx\n"
-"        rep     movsb\n"
-
-"        movl    8(%%esp), %%esi\n"      /* move in back to %esi, toss from */
-"        movl    32(%%esp), %%ebp\n"     /* ebp = lcode */
-"        jmp     .L_while_test\n"
-
-".L_test_for_end_of_block:\n"
-"        testb   $32, %%al\n"
-"        jz      .L_invalid_literal_length_code\n"
-"        movl    $1, 72(%%esp)\n"
-"        jmp     .L_break_loop_with_status\n"
-
-".L_invalid_literal_length_code:\n"
-"        movl    $2, 72(%%esp)\n"
-"        jmp     .L_break_loop_with_status\n"
-
-".L_invalid_distance_code:\n"
-"        movl    $3, 72(%%esp)\n"
-"        jmp     .L_break_loop_with_status\n"
-
-".L_invalid_distance_too_far:\n"
-"        movl    8(%%esp), %%esi\n"
-"        movl    $4, 72(%%esp)\n"
-"        jmp     .L_break_loop_with_status\n"
-
-".L_break_loop:\n"
-"        movl    $0, 72(%%esp)\n"
-
-".L_break_loop_with_status:\n"
-/* put in, out, bits, and hold back into ar and pop esp */
-"        movl    %%esi, 8(%%esp)\n"      /* save in */
-"        movl    %%edi, 16(%%esp)\n"     /* save out */
-"        movl    %%ebx, 44(%%esp)\n"     /* save bits */
-"        movl    %%edx, 40(%%esp)\n"     /* save hold */
-"        movl    4(%%esp), %%ebp\n"      /* restore esp, ebp */
-"        movl    (%%esp), %%esp\n"
-          :
-          : "m" (ar)
-          : "memory", "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi"
-    );
-#elif defined( _MSC_VER ) && ! defined( _M_AMD64 )
-    __asm {
-	lea	eax, ar
-	mov	[eax], esp         /* save esp, ebp */
-	mov	[eax+4], ebp
-	mov	esp, eax
-	mov	esi, [esp+8]       /* esi = in */
-	mov	edi, [esp+16]      /* edi = out */
-	mov	edx, [esp+40]      /* edx = hold */
-	mov	ebx, [esp+44]      /* ebx = bits */
-	mov	ebp, [esp+32]      /* ebp = lcode */
-
-	cld
-	jmp	L_do_loop
-
-ALIGN 4
-L_while_test:
-	cmp	[esp+24], edi
-	jbe	L_break_loop
-	cmp	[esp+12], esi
-	jbe	L_break_loop
-
-L_do_loop:
-	cmp	bl, 15
-	ja	L_get_length_code    /* if (15 < bits) */
-
-	xor	eax, eax
-	lodsw                         /* al = *(ushort *)in++ */
-	mov	cl, bl            /* cl = bits, needs it for shifting */
-	add	bl, 16             /* bits += 16 */
-	shl	eax, cl
-	or	edx, eax        /* hold |= *((ushort *)in)++ << bits */
-
-L_get_length_code:
-	mov	eax, [esp+56]      /* eax = lmask */
-	and	eax, edx          /* eax &= hold */
-	mov	eax, [ebp+eax*4] /* eax = lcode[hold & lmask] */
-
-L_dolen:
-	mov	cl, ah            /* cl = this.bits */
-	sub	bl, ah            /* bits -= this.bits */
-	shr	edx, cl           /* hold >>= this.bits */
-
-	test	al, al
-	jnz	L_test_for_length_base /* if (op != 0) 45.7% */
-
-	shr	eax, 16            /* output this.val char */
-	stosb
-	jmp	L_while_test
-
-ALIGN 4
-L_test_for_length_base:
-	mov	ecx, eax          /* len = this */
-	shr	ecx, 16            /* len = this.val */
-	mov	[esp+64], ecx      /* save len */
-	mov	cl, al
-
-	test	al, 16
-	jz	L_test_for_second_level_length /* if ((op & 16) == 0) 8% */
-	and	cl, 15             /* op &= 15 */
-	jz	L_decode_distance    /* if (!op) */
-	cmp	bl, cl
-	jae	L_add_bits_to_len    /* if (op <= bits) */
-
-	mov	ch, cl            /* stash op in ch, freeing cl */
-	xor	eax, eax
-	lodsw                         /* al = *(ushort *)in++ */
-	mov	cl, bl            /* cl = bits, needs it for shifting */
-	add	bl, 16             /* bits += 16 */
-	shl	eax, cl
-	or	edx, eax         /* hold |= *((ushort *)in)++ << bits */
-	mov	cl, ch            /* move op back to ecx */
-
-L_add_bits_to_len:
-	sub	bl, cl
-	xor	eax, eax
-	inc	eax
-	shl	eax, cl
-	dec	eax
-	and	eax, edx          /* eax &= hold */
-	shr	edx, cl
-	add	[esp+64], eax      /* len += hold & mask[op] */
-
-L_decode_distance:
-	cmp	bl, 15
-	ja	L_get_distance_code  /* if (15 < bits) */
-
-	xor	eax, eax
-	lodsw                         /* al = *(ushort *)in++ */
-	mov	cl, bl            /* cl = bits, needs it for shifting */
-	add	bl, 16             /* bits += 16 */
-	shl	eax, cl
-	or	edx, eax         /* hold |= *((ushort *)in)++ << bits */
-
-L_get_distance_code:
-	mov	eax, [esp+60]      /* eax = dmask */
-	mov	ecx, [esp+36]      /* ecx = dcode */
-	and	eax, edx          /* eax &= hold */
-	mov	eax, [ecx+eax*4]/* eax = dcode[hold & dmask] */
-
-L_dodist:
-	mov	ebp, eax          /* dist = this */
-	shr	ebp, 16            /* dist = this.val */
-	mov	cl, ah
-	sub	bl, ah            /* bits -= this.bits */
-	shr	edx, cl           /* hold >>= this.bits */
-	mov	cl, al            /* cl = this.op */
-
-	test	al, 16             /* if ((op & 16) == 0) */
-	jz	L_test_for_second_level_dist
-	and	cl, 15             /* op &= 15 */
-	jz	L_check_dist_one
-	cmp	bl, cl
-	jae	L_add_bits_to_dist   /* if (op <= bits) 97.6% */
-
-	mov	ch, cl            /* stash op in ch, freeing cl */
-	xor	eax, eax
-	lodsw                         /* al = *(ushort *)in++ */
-	mov	cl, bl            /* cl = bits, needs it for shifting */
-	add	bl, 16             /* bits += 16 */
-	shl	eax, cl
-	or	edx, eax        /* hold |= *((ushort *)in)++ << bits */
-	mov	cl, ch            /* move op back to ecx */
-
-L_add_bits_to_dist:
-	sub	bl, cl
-	xor	eax, eax
-	inc	eax
-	shl	eax, cl
-	dec	eax                 /* (1 << op) - 1 */
-	and	eax, edx          /* eax &= hold */
-	shr	edx, cl
-	add	ebp, eax          /* dist += hold & ((1 << op) - 1) */
-
-L_check_window:
-	mov	[esp+8], esi       /* save in so from can use it's reg */
-	mov	eax, edi
-	sub	eax, [esp+20]      /* nbytes = out - beg */
-
-	cmp	eax, ebp
-	jb	L_clip_window        /* if (dist > nbytes) 4.2% */
-
-	mov	ecx, [esp+64]      /* ecx = len */
-	mov	esi, edi
-	sub	esi, ebp          /* from = out - dist */
-
-	sar	ecx, 1
-	jnc	L_copy_two
-
-	rep     movsw
-	mov	al, [esi]
-	mov	[edi], al
-	inc	edi
-
-	mov	esi, [esp+8]      /* move in back to %esi, toss from */
-	mov	ebp, [esp+32]     /* ebp = lcode */
-	jmp	L_while_test
-
-L_copy_two:
-	rep     movsw
-	mov	esi, [esp+8]      /* move in back to %esi, toss from */
-	mov	ebp, [esp+32]     /* ebp = lcode */
-	jmp	L_while_test
-
-ALIGN 4
-L_check_dist_one:
-	cmp	ebp, 1            /* if dist 1, is a memset */
-	jne	L_check_window
-	cmp	[esp+20], edi
-	je	L_check_window    /* out == beg, if outside window */
-
-	mov	ecx, [esp+64]     /* ecx = len */
-	mov	al, [edi-1]
-	mov	ah, al
-
-	sar	ecx, 1
-	jnc	L_set_two
-	mov	[edi], al         /* memset out with from[-1] */
-	inc	edi
-
-L_set_two:
-	rep     stosw
-	mov	ebp, [esp+32]     /* ebp = lcode */
-	jmp	L_while_test
-
-ALIGN 4
-L_test_for_second_level_length:
-	test	al, 64
-	jnz	L_test_for_end_of_block /* if ((op & 64) != 0) */
-
-	xor	eax, eax
-	inc	eax
-	shl	eax, cl
-	dec	eax
-	and	eax, edx         /* eax &= hold */
-	add	eax, [esp+64]     /* eax += len */
-	mov	eax, [ebp+eax*4] /* eax = lcode[val+(hold&mask[op])]*/
-	jmp	L_dolen
-
-ALIGN 4
-L_test_for_second_level_dist:
-	test	al, 64
-	jnz	L_invalid_distance_code /* if ((op & 64) != 0) */
-
-	xor	eax, eax
-	inc	eax
-	shl	eax, cl
-	dec	eax
-	and	eax, edx         /* eax &= hold */
-	add	eax, ebp         /* eax += dist */
-	mov	ecx, [esp+36]     /* ecx = dcode */
-	mov	eax, [ecx+eax*4] /* eax = dcode[val+(hold&mask[op])]*/
-	jmp	L_dodist
-
-ALIGN 4
-L_clip_window:
-	mov	ecx, eax
-	mov	eax, [esp+48]     /* eax = wsize */
-	neg	ecx                /* nbytes = -nbytes */
-	mov	esi, [esp+28]     /* from = window */
-
-	cmp	eax, ebp
-	jb	L_invalid_distance_too_far /* if (dist > wsize) */
-
-	add	ecx, ebp         /* nbytes = dist - nbytes */
-	cmp	dword ptr [esp+52], 0
-	jne	L_wrap_around_window /* if (write != 0) */
-
-	sub	eax, ecx
-	add	esi, eax         /* from += wsize - nbytes */
-
-	mov	eax, [esp+64]    /* eax = len */
-	cmp	eax, ecx
-	jbe	L_do_copy          /* if (nbytes >= len) */
-
-	sub	eax, ecx         /* len -= nbytes */
-	rep     movsb
-	mov	esi, edi
-	sub	esi, ebp         /* from = out - dist */
-	jmp	L_do_copy
-
-ALIGN 4
-L_wrap_around_window:
-	mov	eax, [esp+52]    /* eax = write */
-	cmp	ecx, eax
-	jbe	L_contiguous_in_window /* if (write >= nbytes) */
-
-	add	esi, [esp+48]    /* from += wsize */
-	add	esi, eax         /* from += write */
-	sub	esi, ecx         /* from -= nbytes */
-	sub	ecx, eax         /* nbytes -= write */
-
-	mov	eax, [esp+64]    /* eax = len */
-	cmp	eax, ecx
-	jbe	L_do_copy          /* if (nbytes >= len) */
-
-	sub	eax, ecx         /* len -= nbytes */
-	rep     movsb
-	mov	esi, [esp+28]     /* from = window */
-	mov	ecx, [esp+52]     /* nbytes = write */
-	cmp	eax, ecx
-	jbe	L_do_copy          /* if (nbytes >= len) */
-
-	sub	eax, ecx         /* len -= nbytes */
-	rep     movsb
-	mov	esi, edi
-	sub	esi, ebp         /* from = out - dist */
-	jmp	L_do_copy
-
-ALIGN 4
-L_contiguous_in_window:
-	add	esi, eax
-	sub	esi, ecx         /* from += write - nbytes */
-
-	mov	eax, [esp+64]    /* eax = len */
-	cmp	eax, ecx
-	jbe	L_do_copy          /* if (nbytes >= len) */
-
-	sub	eax, ecx         /* len -= nbytes */
-	rep     movsb
-	mov	esi, edi
-	sub	esi, ebp         /* from = out - dist */
-	jmp	L_do_copy
-
-ALIGN 4
-L_do_copy:
-	mov	ecx, eax
-	rep     movsb
-
-	mov	esi, [esp+8]      /* move in back to %esi, toss from */
-	mov	ebp, [esp+32]     /* ebp = lcode */
-	jmp	L_while_test
-
-L_test_for_end_of_block:
-	test	al, 32
-	jz	L_invalid_literal_length_code
-	mov	dword ptr [esp+72], 1
-	jmp	L_break_loop_with_status
-
-L_invalid_literal_length_code:
-	mov	dword ptr [esp+72], 2
-	jmp	L_break_loop_with_status
-
-L_invalid_distance_code:
-	mov	dword ptr [esp+72], 3
-	jmp	L_break_loop_with_status
-
-L_invalid_distance_too_far:
-	mov	esi, [esp+4]
-	mov	dword ptr [esp+72], 4
-	jmp	L_break_loop_with_status
-
-L_break_loop:
-	mov	dword ptr [esp+72], 0
-
-L_break_loop_with_status:
-/* put in, out, bits, and hold back into ar and pop esp */
-	mov	[esp+8], esi     /* save in */
-	mov	[esp+16], edi    /* save out */
-	mov	[esp+44], ebx    /* save bits */
-	mov	[esp+40], edx    /* save hold */
-	mov	ebp, [esp+4]     /* restore esp, ebp */
-	mov	esp, [esp]
-    }
-#else
-#error "x86 architecture not defined"
-#endif
-
-    if (ar.status > 1) {
-        if (ar.status == 2)
-            strm->msg = "invalid literal/length code";
-        else if (ar.status == 3)
-            strm->msg = "invalid distance code";
-        else
-            strm->msg = "invalid distance too far back";
-        state->mode = BAD;
-    }
-    else if ( ar.status == 1 ) {
-        state->mode = TYPE;
-    }
-
-    /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
-    ar.len = ar.bits >> 3;
-    ar.in -= ar.len;
-    ar.bits -= ar.len << 3;
-    ar.hold &= (1U << ar.bits) - 1;
-
-    /* update state and return */
-    strm->next_in = ar.in;
-    strm->next_out = ar.out;
-    strm->avail_in = (unsigned)(ar.in < ar.last ?
-                                PAD_AVAIL_IN + (ar.last - ar.in) :
-                                PAD_AVAIL_IN - (ar.in - ar.last));
-    strm->avail_out = (unsigned)(ar.out < ar.end ?
-                                 PAD_AVAIL_OUT + (ar.end - ar.out) :
-                                 PAD_AVAIL_OUT - (ar.out - ar.end));
-    state->hold = ar.hold;
-    state->bits = ar.bits;
-    return;
-}
-
diff --git a/src/png/zlib/contrib/inflate86/inffast.S b/src/png/zlib/contrib/inflate86/inffast.S
deleted file mode 100644
index 2245a2905..000000000
--- a/src/png/zlib/contrib/inflate86/inffast.S
+++ /dev/null
@@ -1,1368 +0,0 @@
-/*
- * inffast.S is a hand tuned assembler version of:
- *
- * inffast.c -- fast decoding
- * Copyright (C) 1995-2003 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- *
- * Copyright (C) 2003 Chris Anderson <christop@charm.net>
- * Please use the copyright conditions above.
- *
- * This version (Jan-23-2003) of inflate_fast was coded and tested under
- * GNU/Linux on a pentium 3, using the gcc-3.2 compiler distribution.  On that
- * machine, I found that gzip style archives decompressed about 20% faster than
- * the gcc-3.2 -O3 -fomit-frame-pointer compiled version.  Your results will
- * depend on how large of a buffer is used for z_stream.next_in & next_out
- * (8K-32K worked best for my 256K cpu cache) and how much overhead there is in
- * stream processing I/O and crc32/addler32.  In my case, this routine used
- * 70% of the cpu time and crc32 used 20%.
- *
- * I am confident that this version will work in the general case, but I have
- * not tested a wide variety of datasets or a wide variety of platforms.
- *
- * Jan-24-2003 -- Added -DUSE_MMX define for slightly faster inflating.
- * It should be a runtime flag instead of compile time flag...
- *
- * Jan-26-2003 -- Added runtime check for MMX support with cpuid instruction.
- * With -DUSE_MMX, only MMX code is compiled.  With -DNO_MMX, only non-MMX code
- * is compiled.  Without either option, runtime detection is enabled.  Runtime
- * detection should work on all modern cpus and the recomended algorithm (flip
- * ID bit on eflags and then use the cpuid instruction) is used in many
- * multimedia applications.  Tested under win2k with gcc-2.95 and gas-2.12
- * distributed with cygwin3.  Compiling with gcc-2.95 -c inffast.S -o
- * inffast.obj generates a COFF object which can then be linked with MSVC++
- * compiled code.  Tested under FreeBSD 4.7 with gcc-2.95.
- *
- * Jan-28-2003 -- Tested Athlon XP... MMX mode is slower than no MMX (and
- * slower than compiler generated code).  Adjusted cpuid check to use the MMX
- * code only for Pentiums < P4 until I have more data on the P4.  Speed
- * improvment is only about 15% on the Athlon when compared with code generated
- * with MSVC++.  Not sure yet, but I think the P4 will also be slower using the
- * MMX mode because many of it's x86 ALU instructions execute in .5 cycles and
- * have less latency than MMX ops.  Added code to buffer the last 11 bytes of
- * the input stream since the MMX code grabs bits in chunks of 32, which
- * differs from the inffast.c algorithm.  I don't think there would have been
- * read overruns where a page boundary was crossed (a segfault), but there
- * could have been overruns when next_in ends on unaligned memory (unintialized
- * memory read).
- *
- * Mar-13-2003 -- P4 MMX is slightly slower than P4 NO_MMX.  I created a C
- * version of the non-MMX code so that it doesn't depend on zstrm and zstate
- * structure offsets which are hard coded in this file.  This was last tested
- * with zlib-1.2.0 which is currently in beta testing, newer versions of this
- * and inffas86.c can be found at http://www.eetbeetee.com/zlib/ and
- * http://www.charm.net/~christop/zlib/
- */
-
-
-/*
- * if you have underscore linking problems (_inflate_fast undefined), try
- * using -DGAS_COFF
- */
-#if ! defined( GAS_COFF ) && ! defined( GAS_ELF )
-
-#if defined( WIN32 ) || defined( __CYGWIN__ )
-#define GAS_COFF /* windows object format */
-#else
-#define GAS_ELF
-#endif
-
-#endif /* ! GAS_COFF && ! GAS_ELF */
-
-
-#if defined( GAS_COFF )
-
-/* coff externals have underscores */
-#define inflate_fast _inflate_fast
-#define inflate_fast_use_mmx _inflate_fast_use_mmx
-
-#endif /* GAS_COFF */
-
-
-.file "inffast.S"
-
-.globl inflate_fast
-
-.text
-.align 4,0
-.L_invalid_literal_length_code_msg:
-.string "invalid literal/length code"
-
-.align 4,0
-.L_invalid_distance_code_msg:
-.string "invalid distance code"
-
-.align 4,0
-.L_invalid_distance_too_far_msg:
-.string "invalid distance too far back"
-
-#if ! defined( NO_MMX )
-.align 4,0
-.L_mask: /* mask[N] = ( 1 << N ) - 1 */
-.long 0
-.long 1
-.long 3
-.long 7
-.long 15
-.long 31
-.long 63
-.long 127
-.long 255
-.long 511
-.long 1023
-.long 2047
-.long 4095
-.long 8191
-.long 16383
-.long 32767
-.long 65535
-.long 131071
-.long 262143
-.long 524287
-.long 1048575
-.long 2097151
-.long 4194303
-.long 8388607
-.long 16777215
-.long 33554431
-.long 67108863
-.long 134217727
-.long 268435455
-.long 536870911
-.long 1073741823
-.long 2147483647
-.long 4294967295
-#endif /* NO_MMX */
-
-.text
-
-/*
- * struct z_stream offsets, in zlib.h
- */
-#define next_in_strm   0   /* strm->next_in */
-#define avail_in_strm  4   /* strm->avail_in */
-#define next_out_strm  12  /* strm->next_out */
-#define avail_out_strm 16  /* strm->avail_out */
-#define msg_strm       24  /* strm->msg */
-#define state_strm     28  /* strm->state */
-
-/*
- * struct inflate_state offsets, in inflate.h
- */
-#define mode_state     0   /* state->mode */
-#define wsize_state    32  /* state->wsize */
-#define write_state    40  /* state->write */
-#define window_state   44  /* state->window */
-#define hold_state     48  /* state->hold */
-#define bits_state     52  /* state->bits */
-#define lencode_state  68  /* state->lencode */
-#define distcode_state 72  /* state->distcode */
-#define lenbits_state  76  /* state->lenbits */
-#define distbits_state 80  /* state->distbits */
-
-/*
- * inflate_fast's activation record
- */
-#define local_var_size 64 /* how much local space for vars */
-#define strm_sp        88 /* first arg: z_stream * (local_var_size + 24) */
-#define start_sp       92 /* second arg: unsigned int (local_var_size + 28) */
-
-/*
- * offsets for local vars on stack
- */
-#define out            60  /* unsigned char* */
-#define window         56  /* unsigned char* */
-#define wsize          52  /* unsigned int */
-#define write          48  /* unsigned int */
-#define in             44  /* unsigned char* */
-#define beg            40  /* unsigned char* */
-#define buf            28  /* char[ 12 ] */
-#define len            24  /* unsigned int */
-#define last           20  /* unsigned char* */
-#define end            16  /* unsigned char* */
-#define dcode          12  /* code* */
-#define lcode           8  /* code* */
-#define dmask           4  /* unsigned int */
-#define lmask           0  /* unsigned int */
-
-/*
- * typedef enum inflate_mode consts, in inflate.h
- */
-#define INFLATE_MODE_TYPE 11  /* state->mode flags enum-ed in inflate.h */
-#define INFLATE_MODE_BAD  26
-
-
-#if ! defined( USE_MMX ) && ! defined( NO_MMX )
-
-#define RUN_TIME_MMX
-
-#define CHECK_MMX    1
-#define DO_USE_MMX   2
-#define DONT_USE_MMX 3
-
-.globl inflate_fast_use_mmx
-
-.data
-
-.align 4,0
-inflate_fast_use_mmx: /* integer flag for run time control 1=check,2=mmx,3=no */
-.long CHECK_MMX
-
-#if defined( GAS_ELF )
-/* elf info */
-.type   inflate_fast_use_mmx,@object
-.size   inflate_fast_use_mmx,4
-#endif
-
-#endif /* RUN_TIME_MMX */
-
-#if defined( GAS_COFF )
-/* coff info: scl 2 = extern, type 32 = function */
-.def inflate_fast; .scl 2; .type 32; .endef
-#endif
-
-.text
-
-.align 32,0x90
-inflate_fast:
-        pushl   %edi
-        pushl   %esi
-        pushl   %ebp
-        pushl   %ebx
-        pushf   /* save eflags (strm_sp, state_sp assumes this is 32 bits) */
-        subl    $local_var_size, %esp
-        cld
-
-#define strm_r  %esi
-#define state_r %edi
-
-        movl    strm_sp(%esp), strm_r
-        movl    state_strm(strm_r), state_r
-
-        /* in = strm->next_in;
-         * out = strm->next_out;
-         * last = in + strm->avail_in - 11;
-         * beg = out - (start - strm->avail_out);
-         * end = out + (strm->avail_out - 257);
-         */
-        movl    avail_in_strm(strm_r), %edx
-        movl    next_in_strm(strm_r), %eax
-
-        addl    %eax, %edx      /* avail_in += next_in */
-        subl    $11, %edx       /* avail_in -= 11 */
-
-        movl    %eax, in(%esp)
-        movl    %edx, last(%esp)
-
-        movl    start_sp(%esp), %ebp
-        movl    avail_out_strm(strm_r), %ecx
-        movl    next_out_strm(strm_r), %ebx
-
-        subl    %ecx, %ebp      /* start -= avail_out */
-        negl    %ebp            /* start = -start */
-        addl    %ebx, %ebp      /* start += next_out */
-
-        subl    $257, %ecx      /* avail_out -= 257 */
-        addl    %ebx, %ecx      /* avail_out += out */
-
-        movl    %ebx, out(%esp)
-        movl    %ebp, beg(%esp)
-        movl    %ecx, end(%esp)
-
-        /* wsize = state->wsize;
-         * write = state->write;
-         * window = state->window;
-         * hold = state->hold;
-         * bits = state->bits;
-         * lcode = state->lencode;
-         * dcode = state->distcode;
-         * lmask = ( 1 << state->lenbits ) - 1;
-         * dmask = ( 1 << state->distbits ) - 1;
-         */
-
-        movl    lencode_state(state_r), %eax
-        movl    distcode_state(state_r), %ecx
-
-        movl    %eax, lcode(%esp)
-        movl    %ecx, dcode(%esp)
-
-        movl    $1, %eax
-        movl    lenbits_state(state_r), %ecx
-        shll    %cl, %eax
-        decl    %eax
-        movl    %eax, lmask(%esp)
-
-        movl    $1, %eax
-        movl    distbits_state(state_r), %ecx
-        shll    %cl, %eax
-        decl    %eax
-        movl    %eax, dmask(%esp)
-
-        movl    wsize_state(state_r), %eax
-        movl    write_state(state_r), %ecx
-        movl    window_state(state_r), %edx
-
-        movl    %eax, wsize(%esp)
-        movl    %ecx, write(%esp)
-        movl    %edx, window(%esp)
-
-        movl    hold_state(state_r), %ebp
-        movl    bits_state(state_r), %ebx
-
-#undef strm_r
-#undef state_r
-
-#define in_r       %esi
-#define from_r     %esi
-#define out_r      %edi
-
-        movl    in(%esp), in_r
-        movl    last(%esp), %ecx
-        cmpl    in_r, %ecx
-        ja      .L_align_long           /* if in < last */
-
-        addl    $11, %ecx               /* ecx = &in[ avail_in ] */
-        subl    in_r, %ecx              /* ecx = avail_in */
-        movl    $12, %eax
-        subl    %ecx, %eax              /* eax = 12 - avail_in */
-        leal    buf(%esp), %edi
-        rep     movsb                   /* memcpy( buf, in, avail_in ) */
-        movl    %eax, %ecx
-        xorl    %eax, %eax
-        rep     stosb         /* memset( &buf[ avail_in ], 0, 12 - avail_in ) */
-        leal    buf(%esp), in_r         /* in = buf */
-        movl    in_r, last(%esp)        /* last = in, do just one iteration */
-        jmp     .L_is_aligned
-
-        /* align in_r on long boundary */
-.L_align_long:
-        testl   $3, in_r
-        jz      .L_is_aligned
-        xorl    %eax, %eax
-        movb    (in_r), %al
-        incl    in_r
-        movl    %ebx, %ecx
-        addl    $8, %ebx
-        shll    %cl, %eax
-        orl     %eax, %ebp
-        jmp     .L_align_long
-
-.L_is_aligned:
-        movl    out(%esp), out_r
-
-#if defined( NO_MMX )
-        jmp     .L_do_loop
-#endif
-
-#if defined( USE_MMX )
-        jmp     .L_init_mmx
-#endif
-
-/*** Runtime MMX check ***/
-
-#if defined( RUN_TIME_MMX )
-.L_check_mmx:
-        cmpl    $DO_USE_MMX, inflate_fast_use_mmx
-        je      .L_init_mmx
-        ja      .L_do_loop /* > 2 */
-
-        pushl   %eax
-        pushl   %ebx
-        pushl   %ecx
-        pushl   %edx
-        pushf
-        movl    (%esp), %eax      /* copy eflags to eax */
-        xorl    $0x200000, (%esp) /* try toggling ID bit of eflags (bit 21)
-                                   * to see if cpu supports cpuid...
-                                   * ID bit method not supported by NexGen but
-                                   * bios may load a cpuid instruction and
-                                   * cpuid may be disabled on Cyrix 5-6x86 */
-        popf
-        pushf
-        popl    %edx              /* copy new eflags to edx */
-        xorl    %eax, %edx        /* test if ID bit is flipped */
-        jz      .L_dont_use_mmx   /* not flipped if zero */
-        xorl    %eax, %eax
-        cpuid
-        cmpl    $0x756e6547, %ebx /* check for GenuineIntel in ebx,ecx,edx */
-        jne     .L_dont_use_mmx
-        cmpl    $0x6c65746e, %ecx
-        jne     .L_dont_use_mmx
-        cmpl    $0x49656e69, %edx
-        jne     .L_dont_use_mmx
-        movl    $1, %eax
-        cpuid                     /* get cpu features */
-        shrl    $8, %eax
-        andl    $15, %eax
-        cmpl    $6, %eax          /* check for Pentium family, is 0xf for P4 */
-        jne     .L_dont_use_mmx
-        testl   $0x800000, %edx   /* test if MMX feature is set (bit 23) */
-        jnz     .L_use_mmx
-        jmp     .L_dont_use_mmx
-.L_use_mmx:
-        movl    $DO_USE_MMX, inflate_fast_use_mmx
-        jmp     .L_check_mmx_pop
-.L_dont_use_mmx:
-        movl    $DONT_USE_MMX, inflate_fast_use_mmx
-.L_check_mmx_pop:
-        popl    %edx
-        popl    %ecx
-        popl    %ebx
-        popl    %eax
-        jmp     .L_check_mmx
-#endif
-
-
-/*** Non-MMX code ***/
-
-#if defined ( NO_MMX ) || defined( RUN_TIME_MMX )
-
-#define hold_r     %ebp
-#define bits_r     %bl
-#define bitslong_r %ebx
-
-.align 32,0x90
-.L_while_test:
-        /* while (in < last && out < end)
-         */
-        cmpl    out_r, end(%esp)
-        jbe     .L_break_loop           /* if (out >= end) */
-
-        cmpl    in_r, last(%esp)
-        jbe     .L_break_loop
-
-.L_do_loop:
-        /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out
-         *
-         * do {
-         *   if (bits < 15) {
-         *     hold |= *((unsigned short *)in)++ << bits;
-         *     bits += 16
-         *   }
-         *   this = lcode[hold & lmask]
-         */
-        cmpb    $15, bits_r
-        ja      .L_get_length_code      /* if (15 < bits) */
-
-        xorl    %eax, %eax
-        lodsw                           /* al = *(ushort *)in++ */
-        movb    bits_r, %cl             /* cl = bits, needs it for shifting */
-        addb    $16, bits_r             /* bits += 16 */
-        shll    %cl, %eax
-        orl     %eax, hold_r            /* hold |= *((ushort *)in)++ << bits */
-
-.L_get_length_code:
-        movl    lmask(%esp), %edx       /* edx = lmask */
-        movl    lcode(%esp), %ecx       /* ecx = lcode */
-        andl    hold_r, %edx            /* edx &= hold */
-        movl    (%ecx,%edx,4), %eax     /* eax = lcode[hold & lmask] */
-
-.L_dolen:
-        /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out
-         *
-         * dolen:
-         *    bits -= this.bits;
-         *    hold >>= this.bits
-         */
-        movb    %ah, %cl                /* cl = this.bits */
-        subb    %ah, bits_r             /* bits -= this.bits */
-        shrl    %cl, hold_r             /* hold >>= this.bits */
-
-        /* check if op is a literal
-         * if (op == 0) {
-         *    PUP(out) = this.val;
-         *  }
-         */
-        testb   %al, %al
-        jnz     .L_test_for_length_base /* if (op != 0) 45.7% */
-
-        shrl    $16, %eax               /* output this.val char */
-        stosb
-        jmp     .L_while_test
-
-.L_test_for_length_base:
-        /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out, %edx = len
-         *
-         * else if (op & 16) {
-         *   len = this.val
-         *   op &= 15
-         *   if (op) {
-         *     if (op > bits) {
-         *       hold |= *((unsigned short *)in)++ << bits;
-         *       bits += 16
-         *     }
-         *     len += hold & mask[op];
-         *     bits -= op;
-         *     hold >>= op;
-         *   }
-         */
-#define len_r %edx
-        movl    %eax, len_r             /* len = this */
-        shrl    $16, len_r              /* len = this.val */
-        movb    %al, %cl
-
-        testb   $16, %al
-        jz      .L_test_for_second_level_length /* if ((op & 16) == 0) 8% */
-        andb    $15, %cl                /* op &= 15 */
-        jz      .L_save_len             /* if (!op) */
-        cmpb    %cl, bits_r
-        jae     .L_add_bits_to_len      /* if (op <= bits) */
-
-        movb    %cl, %ch                /* stash op in ch, freeing cl */
-        xorl    %eax, %eax
-        lodsw                           /* al = *(ushort *)in++ */
-        movb    bits_r, %cl             /* cl = bits, needs it for shifting */
-        addb    $16, bits_r             /* bits += 16 */
-        shll    %cl, %eax
-        orl     %eax, hold_r            /* hold |= *((ushort *)in)++ << bits */
-        movb    %ch, %cl                /* move op back to ecx */
-
-.L_add_bits_to_len:
-        movl    $1, %eax
-        shll    %cl, %eax
-        decl    %eax
-        subb    %cl, bits_r
-        andl    hold_r, %eax            /* eax &= hold */
-        shrl    %cl, hold_r
-        addl    %eax, len_r             /* len += hold & mask[op] */
-
-.L_save_len:
-        movl    len_r, len(%esp)        /* save len */
-#undef  len_r
-
-.L_decode_distance:
-        /* regs: %esi = in, %ebp = hold, %bl = bits, %edi = out, %edx = dist
-         *
-         *   if (bits < 15) {
-         *     hold |= *((unsigned short *)in)++ << bits;
-         *     bits += 16
-         *   }
-         *   this = dcode[hold & dmask];
-         * dodist:
-         *   bits -= this.bits;
-         *   hold >>= this.bits;
-         *   op = this.op;
-         */
-
-        cmpb    $15, bits_r
-        ja      .L_get_distance_code    /* if (15 < bits) */
-
-        xorl    %eax, %eax
-        lodsw                           /* al = *(ushort *)in++ */
-        movb    bits_r, %cl             /* cl = bits, needs it for shifting */
-        addb    $16, bits_r             /* bits += 16 */
-        shll    %cl, %eax
-        orl     %eax, hold_r            /* hold |= *((ushort *)in)++ << bits */
-
-.L_get_distance_code:
-        movl    dmask(%esp), %edx       /* edx = dmask */
-        movl    dcode(%esp), %ecx       /* ecx = dcode */
-        andl    hold_r, %edx            /* edx &= hold */
-        movl    (%ecx,%edx,4), %eax     /* eax = dcode[hold & dmask] */
-
-#define dist_r %edx
-.L_dodist:
-        movl    %eax, dist_r            /* dist = this */
-        shrl    $16, dist_r             /* dist = this.val */
-        movb    %ah, %cl
-        subb    %ah, bits_r             /* bits -= this.bits */
-        shrl    %cl, hold_r             /* hold >>= this.bits */
-
-        /* if (op & 16) {
-         *   dist = this.val
-         *   op &= 15
-         *   if (op > bits) {
-         *     hold |= *((unsigned short *)in)++ << bits;
-         *     bits += 16
-         *   }
-         *   dist += hold & mask[op];
-         *   bits -= op;
-         *   hold >>= op;
-         */
-        movb    %al, %cl                /* cl = this.op */
-
-        testb   $16, %al                /* if ((op & 16) == 0) */
-        jz      .L_test_for_second_level_dist
-        andb    $15, %cl                /* op &= 15 */
-        jz      .L_check_dist_one
-        cmpb    %cl, bits_r
-        jae     .L_add_bits_to_dist     /* if (op <= bits) 97.6% */
-
-        movb    %cl, %ch                /* stash op in ch, freeing cl */
-        xorl    %eax, %eax
-        lodsw                           /* al = *(ushort *)in++ */
-        movb    bits_r, %cl             /* cl = bits, needs it for shifting */
-        addb    $16, bits_r             /* bits += 16 */
-        shll    %cl, %eax
-        orl     %eax, hold_r            /* hold |= *((ushort *)in)++ << bits */
-        movb    %ch, %cl                /* move op back to ecx */
-
-.L_add_bits_to_dist:
-        movl    $1, %eax
-        shll    %cl, %eax
-        decl    %eax                    /* (1 << op) - 1 */
-        subb    %cl, bits_r
-        andl    hold_r, %eax            /* eax &= hold */
-        shrl    %cl, hold_r
-        addl    %eax, dist_r            /* dist += hold & ((1 << op) - 1) */
-        jmp     .L_check_window
-
-.L_check_window:
-        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
-         *       %ecx = nbytes
-         *
-         * nbytes = out - beg;
-         * if (dist <= nbytes) {
-         *   from = out - dist;
-         *   do {
-         *     PUP(out) = PUP(from);
-         *   } while (--len > 0) {
-         * }
-         */
-
-        movl    in_r, in(%esp)          /* save in so from can use it's reg */
-        movl    out_r, %eax
-        subl    beg(%esp), %eax         /* nbytes = out - beg */
-
-        cmpl    dist_r, %eax
-        jb      .L_clip_window          /* if (dist > nbytes) 4.2% */
-
-        movl    len(%esp), %ecx
-        movl    out_r, from_r
-        subl    dist_r, from_r          /* from = out - dist */
-
-        subl    $3, %ecx
-        movb    (from_r), %al
-        movb    %al, (out_r)
-        movb    1(from_r), %al
-        movb    2(from_r), %dl
-        addl    $3, from_r
-        movb    %al, 1(out_r)
-        movb    %dl, 2(out_r)
-        addl    $3, out_r
-        rep     movsb
-
-        movl    in(%esp), in_r          /* move in back to %esi, toss from */
-        jmp     .L_while_test
-
-.align 16,0x90
-.L_check_dist_one:
-        cmpl    $1, dist_r
-        jne     .L_check_window
-        cmpl    out_r, beg(%esp)
-        je      .L_check_window
-
-        decl    out_r
-        movl    len(%esp), %ecx
-        movb    (out_r), %al
-        subl    $3, %ecx
-
-        movb    %al, 1(out_r)
-        movb    %al, 2(out_r)
-        movb    %al, 3(out_r)
-        addl    $4, out_r
-        rep     stosb
-
-        jmp     .L_while_test
-
-.align 16,0x90
-.L_test_for_second_level_length:
-        /* else if ((op & 64) == 0) {
-         *   this = lcode[this.val + (hold & mask[op])];
-         * }
-         */
-        testb   $64, %al
-        jnz     .L_test_for_end_of_block  /* if ((op & 64) != 0) */
-
-        movl    $1, %eax
-        shll    %cl, %eax
-        decl    %eax
-        andl    hold_r, %eax            /* eax &= hold */
-        addl    %edx, %eax              /* eax += this.val */
-        movl    lcode(%esp), %edx       /* edx = lcode */
-        movl    (%edx,%eax,4), %eax     /* eax = lcode[val + (hold&mask[op])] */
-        jmp     .L_dolen
-
-.align 16,0x90
-.L_test_for_second_level_dist:
-        /* else if ((op & 64) == 0) {
-         *   this = dcode[this.val + (hold & mask[op])];
-         * }
-         */
-        testb   $64, %al
-        jnz     .L_invalid_distance_code  /* if ((op & 64) != 0) */
-
-        movl    $1, %eax
-        shll    %cl, %eax
-        decl    %eax
-        andl    hold_r, %eax            /* eax &= hold */
-        addl    %edx, %eax              /* eax += this.val */
-        movl    dcode(%esp), %edx       /* edx = dcode */
-        movl    (%edx,%eax,4), %eax     /* eax = dcode[val + (hold&mask[op])] */
-        jmp     .L_dodist
-
-.align 16,0x90
-.L_clip_window:
-        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
-         *       %ecx = nbytes
-         *
-         * else {
-         *   if (dist > wsize) {
-         *     invalid distance
-         *   }
-         *   from = window;
-         *   nbytes = dist - nbytes;
-         *   if (write == 0) {
-         *     from += wsize - nbytes;
-         */
-#define nbytes_r %ecx
-        movl    %eax, nbytes_r
-        movl    wsize(%esp), %eax       /* prepare for dist compare */
-        negl    nbytes_r                /* nbytes = -nbytes */
-        movl    window(%esp), from_r    /* from = window */
-
-        cmpl    dist_r, %eax
-        jb      .L_invalid_distance_too_far /* if (dist > wsize) */
-
-        addl    dist_r, nbytes_r        /* nbytes = dist - nbytes */
-        cmpl    $0, write(%esp)
-        jne     .L_wrap_around_window   /* if (write != 0) */
-
-        subl    nbytes_r, %eax
-        addl    %eax, from_r            /* from += wsize - nbytes */
-
-        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
-         *       %ecx = nbytes, %eax = len
-         *
-         *     if (nbytes < len) {
-         *       len -= nbytes;
-         *       do {
-         *         PUP(out) = PUP(from);
-         *       } while (--nbytes);
-         *       from = out - dist;
-         *     }
-         *   }
-         */
-#define len_r %eax
-        movl    len(%esp), len_r
-        cmpl    nbytes_r, len_r
-        jbe     .L_do_copy1             /* if (nbytes >= len) */
-
-        subl    nbytes_r, len_r         /* len -= nbytes */
-        rep     movsb
-        movl    out_r, from_r
-        subl    dist_r, from_r          /* from = out - dist */
-        jmp     .L_do_copy1
-
-        cmpl    nbytes_r, len_r
-        jbe     .L_do_copy1             /* if (nbytes >= len) */
-
-        subl    nbytes_r, len_r         /* len -= nbytes */
-        rep     movsb
-        movl    out_r, from_r
-        subl    dist_r, from_r          /* from = out - dist */
-        jmp     .L_do_copy1
-
-.L_wrap_around_window:
-        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
-         *       %ecx = nbytes, %eax = write, %eax = len
-         *
-         *   else if (write < nbytes) {
-         *     from += wsize + write - nbytes;
-         *     nbytes -= write;
-         *     if (nbytes < len) {
-         *       len -= nbytes;
-         *       do {
-         *         PUP(out) = PUP(from);
-         *       } while (--nbytes);
-         *       from = window;
-         *       nbytes = write;
-         *       if (nbytes < len) {
-         *         len -= nbytes;
-         *         do {
-         *           PUP(out) = PUP(from);
-         *         } while(--nbytes);
-         *         from = out - dist;
-         *       }
-         *     }
-         *   }
-         */
-#define write_r %eax
-        movl    write(%esp), write_r
-        cmpl    write_r, nbytes_r
-        jbe     .L_contiguous_in_window /* if (write >= nbytes) */
-
-        addl    wsize(%esp), from_r
-        addl    write_r, from_r
-        subl    nbytes_r, from_r        /* from += wsize + write - nbytes */
-        subl    write_r, nbytes_r       /* nbytes -= write */
-#undef write_r
-
-        movl    len(%esp), len_r
-        cmpl    nbytes_r, len_r
-        jbe     .L_do_copy1             /* if (nbytes >= len) */
-
-        subl    nbytes_r, len_r         /* len -= nbytes */
-        rep     movsb
-        movl    window(%esp), from_r    /* from = window */
-        movl    write(%esp), nbytes_r   /* nbytes = write */
-        cmpl    nbytes_r, len_r
-        jbe     .L_do_copy1             /* if (nbytes >= len) */
-
-        subl    nbytes_r, len_r         /* len -= nbytes */
-        rep     movsb
-        movl    out_r, from_r
-        subl    dist_r, from_r          /* from = out - dist */
-        jmp     .L_do_copy1
-
-.L_contiguous_in_window:
-        /* regs: %esi = from, %ebp = hold, %bl = bits, %edi = out, %edx = dist
-         *       %ecx = nbytes, %eax = write, %eax = len
-         *
-         *   else {
-         *     from += write - nbytes;
-         *     if (nbytes < len) {
-         *       len -= nbytes;
-         *       do {
-         *         PUP(out) = PUP(from);
-         *       } while (--nbytes);
-         *       from = out - dist;
-         *     }
-         *   }
-         */
-#define write_r %eax
-        addl    write_r, from_r
-        subl    nbytes_r, from_r        /* from += write - nbytes */
-#undef write_r
-
-        movl    len(%esp), len_r
-        cmpl    nbytes_r, len_r
-        jbe     .L_do_copy1             /* if (nbytes >= len) */
-
-        subl    nbytes_r, len_r         /* len -= nbytes */
-        rep     movsb
-        movl    out_r, from_r
-        subl    dist_r, from_r          /* from = out - dist */
-
-.L_do_copy1:
-        /* regs: %esi = from, %esi = in, %ebp = hold, %bl = bits, %edi = out
-         *       %eax = len
-         *
-         *     while (len > 0) {
-         *       PUP(out) = PUP(from);
-         *       len--;
-         *     }
-         *   }
-         * } while (in < last && out < end);
-         */
-#undef nbytes_r
-#define in_r %esi
-        movl    len_r, %ecx
-        rep     movsb
-
-        movl    in(%esp), in_r          /* move in back to %esi, toss from */
-        jmp     .L_while_test
-
-#undef len_r
-#undef dist_r
-
-#endif /* NO_MMX || RUN_TIME_MMX */
-
-
-/*** MMX code ***/
-
-#if defined( USE_MMX ) || defined( RUN_TIME_MMX )
-
-.align 32,0x90
-.L_init_mmx:
-        emms
-
-#undef  bits_r
-#undef  bitslong_r
-#define bitslong_r %ebp
-#define hold_mm    %mm0
-        movd    %ebp, hold_mm
-        movl    %ebx, bitslong_r
-
-#define used_mm   %mm1
-#define dmask2_mm %mm2
-#define lmask2_mm %mm3
-#define lmask_mm  %mm4
-#define dmask_mm  %mm5
-#define tmp_mm    %mm6
-
-        movd    lmask(%esp), lmask_mm
-        movq    lmask_mm, lmask2_mm
-        movd    dmask(%esp), dmask_mm
-        movq    dmask_mm, dmask2_mm
-        pxor    used_mm, used_mm
-        movl    lcode(%esp), %ebx       /* ebx = lcode */
-        jmp     .L_do_loop_mmx
-
-.align 32,0x90
-.L_while_test_mmx:
-        /* while (in < last && out < end)
-         */
-        cmpl    out_r, end(%esp)
-        jbe     .L_break_loop           /* if (out >= end) */
-
-        cmpl    in_r, last(%esp)
-        jbe     .L_break_loop
-
-.L_do_loop_mmx:
-        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
-
-        cmpl    $32, bitslong_r
-        ja      .L_get_length_code_mmx  /* if (32 < bits) */
-
-        movd    bitslong_r, tmp_mm
-        movd    (in_r), %mm7
-        addl    $4, in_r
-        psllq   tmp_mm, %mm7
-        addl    $32, bitslong_r
-        por     %mm7, hold_mm           /* hold_mm |= *((uint *)in)++ << bits */
-
-.L_get_length_code_mmx:
-        pand    hold_mm, lmask_mm
-        movd    lmask_mm, %eax
-        movq    lmask2_mm, lmask_mm
-        movl    (%ebx,%eax,4), %eax     /* eax = lcode[hold & lmask] */
-
-.L_dolen_mmx:
-        movzbl  %ah, %ecx               /* ecx = this.bits */
-        movd    %ecx, used_mm
-        subl    %ecx, bitslong_r        /* bits -= this.bits */
-
-        testb   %al, %al
-        jnz     .L_test_for_length_base_mmx /* if (op != 0) 45.7% */
-
-        shrl    $16, %eax               /* output this.val char */
-        stosb
-        jmp     .L_while_test_mmx
-
-.L_test_for_length_base_mmx:
-#define len_r  %edx
-        movl    %eax, len_r             /* len = this */
-        shrl    $16, len_r              /* len = this.val */
-
-        testb   $16, %al
-        jz      .L_test_for_second_level_length_mmx /* if ((op & 16) == 0) 8% */
-        andl    $15, %eax               /* op &= 15 */
-        jz      .L_decode_distance_mmx  /* if (!op) */
-
-        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
-        movd    %eax, used_mm
-        movd    hold_mm, %ecx
-        subl    %eax, bitslong_r
-        andl    .L_mask(,%eax,4), %ecx
-        addl    %ecx, len_r             /* len += hold & mask[op] */
-
-.L_decode_distance_mmx:
-        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
-
-        cmpl    $32, bitslong_r
-        ja      .L_get_dist_code_mmx    /* if (32 < bits) */
-
-        movd    bitslong_r, tmp_mm
-        movd    (in_r), %mm7
-        addl    $4, in_r
-        psllq   tmp_mm, %mm7
-        addl    $32, bitslong_r
-        por     %mm7, hold_mm           /* hold_mm |= *((uint *)in)++ << bits */
-
-.L_get_dist_code_mmx:
-        movl    dcode(%esp), %ebx       /* ebx = dcode */
-        pand    hold_mm, dmask_mm
-        movd    dmask_mm, %eax
-        movq    dmask2_mm, dmask_mm
-        movl    (%ebx,%eax,4), %eax     /* eax = dcode[hold & lmask] */
-
-.L_dodist_mmx:
-#define dist_r %ebx
-        movzbl  %ah, %ecx               /* ecx = this.bits */
-        movl    %eax, dist_r
-        shrl    $16, dist_r             /* dist  = this.val */
-        subl    %ecx, bitslong_r        /* bits -= this.bits */
-        movd    %ecx, used_mm
-
-        testb   $16, %al                /* if ((op & 16) == 0) */
-        jz      .L_test_for_second_level_dist_mmx
-        andl    $15, %eax               /* op &= 15 */
-        jz      .L_check_dist_one_mmx
-
-.L_add_bits_to_dist_mmx:
-        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
-        movd    %eax, used_mm           /* save bit length of current op */
-        movd    hold_mm, %ecx           /* get the next bits on input stream */
-        subl    %eax, bitslong_r        /* bits -= op bits */
-        andl    .L_mask(,%eax,4), %ecx  /* ecx   = hold & mask[op] */
-        addl    %ecx, dist_r            /* dist += hold & mask[op] */
-
-.L_check_window_mmx:
-        movl    in_r, in(%esp)          /* save in so from can use it's reg */
-        movl    out_r, %eax
-        subl    beg(%esp), %eax         /* nbytes = out - beg */
-
-        cmpl    dist_r, %eax
-        jb      .L_clip_window_mmx      /* if (dist > nbytes) 4.2% */
-
-        movl    len_r, %ecx
-        movl    out_r, from_r
-        subl    dist_r, from_r          /* from = out - dist */
-
-        subl    $3, %ecx
-        movb    (from_r), %al
-        movb    %al, (out_r)
-        movb    1(from_r), %al
-        movb    2(from_r), %dl
-        addl    $3, from_r
-        movb    %al, 1(out_r)
-        movb    %dl, 2(out_r)
-        addl    $3, out_r
-        rep     movsb
-
-        movl    in(%esp), in_r          /* move in back to %esi, toss from */
-        movl    lcode(%esp), %ebx       /* move lcode back to %ebx, toss dist */
-        jmp     .L_while_test_mmx
-
-.align 16,0x90
-.L_check_dist_one_mmx:
-        cmpl    $1, dist_r
-        jne     .L_check_window_mmx
-        cmpl    out_r, beg(%esp)
-        je      .L_check_window_mmx
-
-        decl    out_r
-        movl    len_r, %ecx
-        movb    (out_r), %al
-        subl    $3, %ecx
-
-        movb    %al, 1(out_r)
-        movb    %al, 2(out_r)
-        movb    %al, 3(out_r)
-        addl    $4, out_r
-        rep     stosb
-
-        movl    lcode(%esp), %ebx       /* move lcode back to %ebx, toss dist */
-        jmp     .L_while_test_mmx
-
-.align 16,0x90
-.L_test_for_second_level_length_mmx:
-        testb   $64, %al
-        jnz     .L_test_for_end_of_block  /* if ((op & 64) != 0) */
-
-        andl    $15, %eax
-        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
-        movd    hold_mm, %ecx
-        andl    .L_mask(,%eax,4), %ecx
-        addl    len_r, %ecx
-        movl    (%ebx,%ecx,4), %eax     /* eax = lcode[hold & lmask] */
-        jmp     .L_dolen_mmx
-
-.align 16,0x90
-.L_test_for_second_level_dist_mmx:
-        testb   $64, %al
-        jnz     .L_invalid_distance_code  /* if ((op & 64) != 0) */
-
-        andl    $15, %eax
-        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
-        movd    hold_mm, %ecx
-        andl    .L_mask(,%eax,4), %ecx
-        movl    dcode(%esp), %eax       /* ecx = dcode */
-        addl    dist_r, %ecx
-        movl    (%eax,%ecx,4), %eax     /* eax = lcode[hold & lmask] */
-        jmp     .L_dodist_mmx
-
-.align 16,0x90
-.L_clip_window_mmx:
-#define nbytes_r %ecx
-        movl    %eax, nbytes_r
-        movl    wsize(%esp), %eax       /* prepare for dist compare */
-        negl    nbytes_r                /* nbytes = -nbytes */
-        movl    window(%esp), from_r    /* from = window */
-
-        cmpl    dist_r, %eax
-        jb      .L_invalid_distance_too_far /* if (dist > wsize) */
-
-        addl    dist_r, nbytes_r        /* nbytes = dist - nbytes */
-        cmpl    $0, write(%esp)
-        jne     .L_wrap_around_window_mmx /* if (write != 0) */
-
-        subl    nbytes_r, %eax
-        addl    %eax, from_r            /* from += wsize - nbytes */
-
-        cmpl    nbytes_r, len_r
-        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */
-
-        subl    nbytes_r, len_r         /* len -= nbytes */
-        rep     movsb
-        movl    out_r, from_r
-        subl    dist_r, from_r          /* from = out - dist */
-        jmp     .L_do_copy1_mmx
-
-        cmpl    nbytes_r, len_r
-        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */
-
-        subl    nbytes_r, len_r         /* len -= nbytes */
-        rep     movsb
-        movl    out_r, from_r
-        subl    dist_r, from_r          /* from = out - dist */
-        jmp     .L_do_copy1_mmx
-
-.L_wrap_around_window_mmx:
-#define write_r %eax
-        movl    write(%esp), write_r
-        cmpl    write_r, nbytes_r
-        jbe     .L_contiguous_in_window_mmx /* if (write >= nbytes) */
-
-        addl    wsize(%esp), from_r
-        addl    write_r, from_r
-        subl    nbytes_r, from_r        /* from += wsize + write - nbytes */
-        subl    write_r, nbytes_r       /* nbytes -= write */
-#undef write_r
-
-        cmpl    nbytes_r, len_r
-        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */
-
-        subl    nbytes_r, len_r         /* len -= nbytes */
-        rep     movsb
-        movl    window(%esp), from_r    /* from = window */
-        movl    write(%esp), nbytes_r   /* nbytes = write */
-        cmpl    nbytes_r, len_r
-        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */
-
-        subl    nbytes_r, len_r         /* len -= nbytes */
-        rep     movsb
-        movl    out_r, from_r
-        subl    dist_r, from_r          /* from = out - dist */
-        jmp     .L_do_copy1_mmx
-
-.L_contiguous_in_window_mmx:
-#define write_r %eax
-        addl    write_r, from_r
-        subl    nbytes_r, from_r        /* from += write - nbytes */
-#undef write_r
-
-        cmpl    nbytes_r, len_r
-        jbe     .L_do_copy1_mmx         /* if (nbytes >= len) */
-
-        subl    nbytes_r, len_r         /* len -= nbytes */
-        rep     movsb
-        movl    out_r, from_r
-        subl    dist_r, from_r          /* from = out - dist */
-
-.L_do_copy1_mmx:
-#undef nbytes_r
-#define in_r %esi
-        movl    len_r, %ecx
-        rep     movsb
-
-        movl    in(%esp), in_r          /* move in back to %esi, toss from */
-        movl    lcode(%esp), %ebx       /* move lcode back to %ebx, toss dist */
-        jmp     .L_while_test_mmx
-
-#undef hold_r
-#undef bitslong_r
-
-#endif /* USE_MMX || RUN_TIME_MMX */
-
-
-/*** USE_MMX, NO_MMX, and RUNTIME_MMX from here on ***/
-
-.L_invalid_distance_code:
-        /* else {
-         *   strm->msg = "invalid distance code";
-         *   state->mode = BAD;
-         * }
-         */
-        movl    $.L_invalid_distance_code_msg, %ecx
-        movl    $INFLATE_MODE_BAD, %edx
-        jmp     .L_update_stream_state
-
-.L_test_for_end_of_block:
-        /* else if (op & 32) {
-         *   state->mode = TYPE;
-         *   break;
-         * }
-         */
-        testb   $32, %al
-        jz      .L_invalid_literal_length_code  /* if ((op & 32) == 0) */
-
-        movl    $0, %ecx
-        movl    $INFLATE_MODE_TYPE, %edx
-        jmp     .L_update_stream_state
-
-.L_invalid_literal_length_code:
-        /* else {
-         *   strm->msg = "invalid literal/length code";
-         *   state->mode = BAD;
-         * }
-         */
-        movl    $.L_invalid_literal_length_code_msg, %ecx
-        movl    $INFLATE_MODE_BAD, %edx
-        jmp     .L_update_stream_state
-
-.L_invalid_distance_too_far:
-        /* strm->msg = "invalid distance too far back";
-         * state->mode = BAD;
-         */
-        movl    in(%esp), in_r          /* from_r has in's reg, put in back */
-        movl    $.L_invalid_distance_too_far_msg, %ecx
-        movl    $INFLATE_MODE_BAD, %edx
-        jmp     .L_update_stream_state
-
-.L_update_stream_state:
-        /* set strm->msg = %ecx, strm->state->mode = %edx */
-        movl    strm_sp(%esp), %eax
-        testl   %ecx, %ecx              /* if (msg != NULL) */
-        jz      .L_skip_msg
-        movl    %ecx, msg_strm(%eax)    /* strm->msg = msg */
-.L_skip_msg:
-        movl    state_strm(%eax), %eax  /* state = strm->state */
-        movl    %edx, mode_state(%eax)  /* state->mode = edx (BAD | TYPE) */
-        jmp     .L_break_loop
-
-.align 32,0x90
-.L_break_loop:
-
-/*
- * Regs:
- *
- * bits = %ebp when mmx, and in %ebx when non-mmx
- * hold = %hold_mm when mmx, and in %ebp when non-mmx
- * in   = %esi
- * out  = %edi
- */
-
-#if defined( USE_MMX ) || defined( RUN_TIME_MMX )
-
-#if defined( RUN_TIME_MMX )
-
-        cmpl    $DO_USE_MMX, inflate_fast_use_mmx
-        jne     .L_update_next_in
-
-#endif /* RUN_TIME_MMX */
-
-        movl    %ebp, %ebx
-
-.L_update_next_in:
-
-#endif
-
-#define strm_r  %eax
-#define state_r %edx
-
-        /* len = bits >> 3;
-         * in -= len;
-         * bits -= len << 3;
-         * hold &= (1U << bits) - 1;
-         * state->hold = hold;
-         * state->bits = bits;
-         * strm->next_in = in;
-         * strm->next_out = out;
-         */
-        movl    strm_sp(%esp), strm_r
-        movl    %ebx, %ecx
-        movl    state_strm(strm_r), state_r
-        shrl    $3, %ecx
-        subl    %ecx, in_r
-        shll    $3, %ecx
-        subl    %ecx, %ebx
-        movl    out_r, next_out_strm(strm_r)
-        movl    %ebx, bits_state(state_r)
-        movl    %ebx, %ecx
-
-        leal    buf(%esp), %ebx
-        cmpl    %ebx, last(%esp)
-        jne     .L_buf_not_used         /* if buf != last */
-
-        subl    %ebx, in_r              /* in -= buf */
-        movl    next_in_strm(strm_r), %ebx
-        movl    %ebx, last(%esp)        /* last = strm->next_in */
-        addl    %ebx, in_r              /* in += strm->next_in */
-        movl    avail_in_strm(strm_r), %ebx
-        subl    $11, %ebx
-        addl    %ebx, last(%esp)    /* last = &strm->next_in[ avail_in - 11 ] */
-
-.L_buf_not_used:
-        movl    in_r, next_in_strm(strm_r)
-
-        movl    $1, %ebx
-        shll    %cl, %ebx
-        decl    %ebx
-
-#if defined( USE_MMX ) || defined( RUN_TIME_MMX )
-
-#if defined( RUN_TIME_MMX )
-
-        cmpl    $DO_USE_MMX, inflate_fast_use_mmx
-        jne     .L_update_hold
-
-#endif /* RUN_TIME_MMX */
-
-        psrlq   used_mm, hold_mm        /* hold_mm >>= last bit length */
-        movd    hold_mm, %ebp
-
-        emms
-
-.L_update_hold:
-
-#endif /* USE_MMX || RUN_TIME_MMX */
-
-        andl    %ebx, %ebp
-        movl    %ebp, hold_state(state_r)
-
-#define last_r %ebx
-
-        /* strm->avail_in = in < last ? 11 + (last - in) : 11 - (in - last) */
-        movl    last(%esp), last_r
-        cmpl    in_r, last_r
-        jbe     .L_last_is_smaller     /* if (in >= last) */
-
-        subl    in_r, last_r           /* last -= in */
-        addl    $11, last_r            /* last += 11 */
-        movl    last_r, avail_in_strm(strm_r)
-        jmp     .L_fixup_out
-.L_last_is_smaller:
-        subl    last_r, in_r           /* in -= last */
-        negl    in_r                   /* in = -in */
-        addl    $11, in_r              /* in += 11 */
-        movl    in_r, avail_in_strm(strm_r)
-
-#undef last_r
-#define end_r %ebx
-
-.L_fixup_out:
-        /* strm->avail_out = out < end ? 257 + (end - out) : 257 - (out - end)*/
-        movl    end(%esp), end_r
-        cmpl    out_r, end_r
-        jbe     .L_end_is_smaller      /* if (out >= end) */
-
-        subl    out_r, end_r           /* end -= out */
-        addl    $257, end_r            /* end += 257 */
-        movl    end_r, avail_out_strm(strm_r)
-        jmp     .L_done
-.L_end_is_smaller:
-        subl    end_r, out_r           /* out -= end */
-        negl    out_r                  /* out = -out */
-        addl    $257, out_r            /* out += 257 */
-        movl    out_r, avail_out_strm(strm_r)
-
-#undef end_r
-#undef strm_r
-#undef state_r
-
-.L_done:
-        addl    $local_var_size, %esp
-        popf
-        popl    %ebx
-        popl    %ebp
-        popl    %esi
-        popl    %edi
-        ret
-
-#if defined( GAS_ELF )
-/* elf info */
-.type inflate_fast,@function
-.size inflate_fast,.-inflate_fast
-#endif
diff --git a/src/png/zlib/contrib/iostream/test.cpp b/src/png/zlib/contrib/iostream/test.cpp
deleted file mode 100644
index 7d265b3b5..000000000
--- a/src/png/zlib/contrib/iostream/test.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-
-#include "zfstream.h"
-
-int main() {
-
-  // Construct a stream object with this filebuffer.  Anything sent
-  // to this stream will go to standard out.
-  gzofstream os( 1, ios::out );
-
-  // This text is getting compressed and sent to stdout.
-  // To prove this, run 'test | zcat'.
-  os << "Hello, Mommy" << endl;
-
-  os << setcompressionlevel( Z_NO_COMPRESSION );
-  os << "hello, hello, hi, ho!" << endl;
-
-  setcompressionlevel( os, Z_DEFAULT_COMPRESSION )
-    << "I'm compressing again" << endl;
-
-  os.close();
-
-  return 0;
-
-}
diff --git a/src/png/zlib/contrib/iostream/zfstream.cpp b/src/png/zlib/contrib/iostream/zfstream.cpp
deleted file mode 100644
index d0cd85faa..000000000
--- a/src/png/zlib/contrib/iostream/zfstream.cpp
+++ /dev/null
@@ -1,329 +0,0 @@
-
-#include "zfstream.h"
-
-gzfilebuf::gzfilebuf() :
-  file(NULL),
-  mode(0),
-  own_file_descriptor(0)
-{ }
-
-gzfilebuf::~gzfilebuf() {
-
-  sync();
-  if ( own_file_descriptor )
-    close();
-
-}
-
-gzfilebuf *gzfilebuf::open( const char *name,
-                            int io_mode ) {
-
-  if ( is_open() )
-    return NULL;
-
-  char char_mode[10];
-  char *p = char_mode;
-
-  if ( io_mode & ios::in ) {
-    mode = ios::in;
-    *p++ = 'r';
-  } else if ( io_mode & ios::app ) {
-    mode = ios::app;
-    *p++ = 'a';
-  } else {
-    mode = ios::out;
-    *p++ = 'w';
-  }
-
-  if ( io_mode & ios::binary ) {
-    mode |= ios::binary;
-    *p++ = 'b';
-  }
-
-  // Hard code the compression level
-  if ( io_mode & (ios::out|ios::app )) {
-    *p++ = '9';
-  }
-
-  // Put the end-of-string indicator
-  *p = '\0';
-
-  if ( (file = gzopen(name, char_mode)) == NULL )
-    return NULL;
-
-  own_file_descriptor = 1;
-
-  return this;
-
-}
-
-gzfilebuf *gzfilebuf::attach( int file_descriptor,
-                              int io_mode ) {
-
-  if ( is_open() )
-    return NULL;
-
-  char char_mode[10];
-  char *p = char_mode;
-
-  if ( io_mode & ios::in ) {
-    mode = ios::in;
-    *p++ = 'r';
-  } else if ( io_mode & ios::app ) {
-    mode = ios::app;
-    *p++ = 'a';
-  } else {
-    mode = ios::out;
-    *p++ = 'w';
-  }
-
-  if ( io_mode & ios::binary ) {
-    mode |= ios::binary;
-    *p++ = 'b';
-  }
-
-  // Hard code the compression level
-  if ( io_mode & (ios::out|ios::app )) {
-    *p++ = '9';
-  }
-
-  // Put the end-of-string indicator
-  *p = '\0';
-
-  if ( (file = gzdopen(file_descriptor, char_mode)) == NULL )
-    return NULL;
-
-  own_file_descriptor = 0;
-
-  return this;
-
-}
-
-gzfilebuf *gzfilebuf::close() {
-
-  if ( is_open() ) {
-
-    sync();
-    gzclose( file );
-    file = NULL;
-
-  }
-
-  return this;
-
-}
-
-int gzfilebuf::setcompressionlevel( int comp_level ) {
-
-  return gzsetparams(file, comp_level, -2);
-
-}
-
-int gzfilebuf::setcompressionstrategy( int comp_strategy ) {
-
-  return gzsetparams(file, -2, comp_strategy);
-
-}
-
-
-streampos gzfilebuf::seekoff( streamoff off, ios::seek_dir dir, int which ) {
-
-  return streampos(EOF);
-
-}
-
-int gzfilebuf::underflow() {
-
-  // If the file hasn't been opened for reading, error.
-  if ( !is_open() || !(mode & ios::in) )
-    return EOF;
-
-  // if a buffer doesn't exists, allocate one.
-  if ( !base() ) {
-
-    if ( (allocate()) == EOF )
-      return EOF;
-    setp(0,0);
-
-  } else {
-
-    if ( in_avail() )
-      return (unsigned char) *gptr();
-
-    if ( out_waiting() ) {
-      if ( flushbuf() == EOF )
-        return EOF;
-    }
-
-  }
-
-  // Attempt to fill the buffer.
-
-  int result = fillbuf();
-  if ( result == EOF ) {
-    // disable get area
-    setg(0,0,0);
-    return EOF;
-  }
-
-  return (unsigned char) *gptr();
-
-}
-
-int gzfilebuf::overflow( int c ) {
-
-  if ( !is_open() || !(mode & ios::out) )
-    return EOF;
-
-  if ( !base() ) {
-    if ( allocate() == EOF )
-      return EOF;
-    setg(0,0,0);
-  } else {
-    if (in_avail()) {
-        return EOF;
-    }
-    if (out_waiting()) {
-      if (flushbuf() == EOF)
-        return EOF;
-    }
-  }
-
-  int bl = blen();
-  setp( base(), base() + bl);
-
-  if ( c != EOF ) {
-
-    *pptr() = c;
-    pbump(1);
-
-  }
-
-  return 0;
-
-}
-
-int gzfilebuf::sync() {
-
-  if ( !is_open() )
-    return EOF;
-
-  if ( out_waiting() )
-    return flushbuf();
-
-  return 0;
-
-}
-
-int gzfilebuf::flushbuf() {
-
-  int n;
-  char *q;
-
-  q = pbase();
-  n = pptr() - q;
-
-  if ( gzwrite( file, q, n) < n )
-    return EOF;
-
-  setp(0,0);
-
-  return 0;
-
-}
-
-int gzfilebuf::fillbuf() {
-
-  int required;
-  char *p;
-
-  p = base();
-
-  required = blen();
-
-  int t = gzread( file, p, required );
-
-  if ( t <= 0) return EOF;
-
-  setg( base(), base(), base()+t);
-
-  return t;
-
-}
-
-gzfilestream_common::gzfilestream_common() :
-  ios( gzfilestream_common::rdbuf() )
-{ }
-
-gzfilestream_common::~gzfilestream_common()
-{ }
-
-void gzfilestream_common::attach( int fd, int io_mode ) {
-
-  if ( !buffer.attach( fd, io_mode) )
-    clear( ios::failbit | ios::badbit );
-  else
-    clear();
-
-}
-
-void gzfilestream_common::open( const char *name, int io_mode ) {
-
-  if ( !buffer.open( name, io_mode ) )
-    clear( ios::failbit | ios::badbit );
-  else
-    clear();
-
-}
-
-void gzfilestream_common::close() {
-
-  if ( !buffer.close() )
-    clear( ios::failbit | ios::badbit );
-
-}
-
-gzfilebuf *gzfilestream_common::rdbuf()
-{
-  return &buffer;
-}
-
-gzifstream::gzifstream() :
-  ios( gzfilestream_common::rdbuf() )
-{
-  clear( ios::badbit );
-}
-
-gzifstream::gzifstream( const char *name, int io_mode ) :
-  ios( gzfilestream_common::rdbuf() )
-{
-  gzfilestream_common::open( name, io_mode );
-}
-
-gzifstream::gzifstream( int fd, int io_mode ) :
-  ios( gzfilestream_common::rdbuf() )
-{
-  gzfilestream_common::attach( fd, io_mode );
-}
-
-gzifstream::~gzifstream() { }
-
-gzofstream::gzofstream() :
-  ios( gzfilestream_common::rdbuf() )
-{
-  clear( ios::badbit );
-}
-
-gzofstream::gzofstream( const char *name, int io_mode ) :
-  ios( gzfilestream_common::rdbuf() )
-{
-  gzfilestream_common::open( name, io_mode );
-}
-
-gzofstream::gzofstream( int fd, int io_mode ) :
-  ios( gzfilestream_common::rdbuf() )
-{
-  gzfilestream_common::attach( fd, io_mode );
-}
-
-gzofstream::~gzofstream() { }
diff --git a/src/png/zlib/contrib/iostream/zfstream.h b/src/png/zlib/contrib/iostream/zfstream.h
deleted file mode 100644
index ed79098a3..000000000
--- a/src/png/zlib/contrib/iostream/zfstream.h
+++ /dev/null
@@ -1,128 +0,0 @@
-
-#ifndef zfstream_h
-#define zfstream_h
-
-#include <fstream.h>
-#include "zlib.h"
-
-class gzfilebuf : public streambuf {
-
-public:
-
-  gzfilebuf( );
-  virtual ~gzfilebuf();
-
-  gzfilebuf *open( const char *name, int io_mode );
-  gzfilebuf *attach( int file_descriptor, int io_mode );
-  gzfilebuf *close();
-
-  int setcompressionlevel( int comp_level );
-  int setcompressionstrategy( int comp_strategy );
-
-  inline int is_open() const { return (file !=NULL); }
-
-  virtual streampos seekoff( streamoff, ios::seek_dir, int );
-
-  virtual int sync();
-
-protected:
-
-  virtual int underflow();
-  virtual int overflow( int = EOF );
-
-private:
-
-  gzFile file;
-  short mode;
-  short own_file_descriptor;
-
-  int flushbuf();
-  int fillbuf();
-
-};
-
-class gzfilestream_common : virtual public ios {
-
-  friend class gzifstream;
-  friend class gzofstream;
-  friend gzofstream &setcompressionlevel( gzofstream &, int );
-  friend gzofstream &setcompressionstrategy( gzofstream &, int );
-
-public:
-  virtual ~gzfilestream_common();
-
-  void attach( int fd, int io_mode );
-  void open( const char *name, int io_mode );
-  void close();
-
-protected:
-  gzfilestream_common();
-
-private:
-  gzfilebuf *rdbuf();
-
-  gzfilebuf buffer;
-
-};
-
-class gzifstream : public gzfilestream_common, public istream {
-
-public:
-
-  gzifstream();
-  gzifstream( const char *name, int io_mode = ios::in );
-  gzifstream( int fd, int io_mode = ios::in );
-
-  virtual ~gzifstream();
-
-};
-
-class gzofstream : public gzfilestream_common, public ostream {
-
-public:
-
-  gzofstream();
-  gzofstream( const char *name, int io_mode = ios::out );
-  gzofstream( int fd, int io_mode = ios::out );
-
-  virtual ~gzofstream();
-
-};
-
-template<class T> class gzomanip {
-  friend gzofstream &operator<<(gzofstream &, const gzomanip<T> &);
-public:
-  gzomanip(gzofstream &(*f)(gzofstream &, T), T v) : func(f), val(v) { }
-private:
-  gzofstream &(*func)(gzofstream &, T);
-  T val;
-};
-
-template<class T> gzofstream &operator<<(gzofstream &s, const gzomanip<T> &m)
-{
-  return (*m.func)(s, m.val);
-}
-
-inline gzofstream &setcompressionlevel( gzofstream &s, int l )
-{
-  (s.rdbuf())->setcompressionlevel(l);
-  return s;
-}
-
-inline gzofstream &setcompressionstrategy( gzofstream &s, int l )
-{
-  (s.rdbuf())->setcompressionstrategy(l);
-  return s;
-}
-
-inline gzomanip<int> setcompressionlevel(int l)
-{
-  return gzomanip<int>(&setcompressionlevel,l);
-}
-
-inline gzomanip<int> setcompressionstrategy(int l)
-{
-  return gzomanip<int>(&setcompressionstrategy,l);
-}
-
-#endif
diff --git a/src/png/zlib/contrib/iostream2/zstream.h b/src/png/zlib/contrib/iostream2/zstream.h
deleted file mode 100644
index 43d2332b7..000000000
--- a/src/png/zlib/contrib/iostream2/zstream.h
+++ /dev/null
@@ -1,307 +0,0 @@
-/*
- *
- * Copyright (c) 1997
- * Christian Michelsen Research AS
- * Advanced Computing
- * Fantoftvegen 38, 5036 BERGEN, Norway
- * http://www.cmr.no
- *
- * Permission to use, copy, modify, distribute and sell this software
- * and its documentation for any purpose is hereby granted without fee,
- * provided that the above copyright notice appear in all copies and
- * that both that copyright notice and this permission notice appear
- * in supporting documentation.  Christian Michelsen Research AS makes no
- * representations about the suitability of this software for any
- * purpose.  It is provided "as is" without express or implied warranty.
- *
- */
-
-#ifndef ZSTREAM__H
-#define ZSTREAM__H
-
-/*
- * zstream.h - C++ interface to the 'zlib' general purpose compression library
- * $Id: zstream.h 1.1 1997-06-25 12:00:56+02 tyge Exp tyge $
- */
-
-#include <strstream.h>
-#include <string.h>
-#include <stdio.h>
-#include "zlib.h"
-
-#if defined(_WIN32)
-#   include <fcntl.h>
-#   include <io.h>
-#   define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
-#else
-#   define SET_BINARY_MODE(file)
-#endif
-
-class zstringlen {
-public:
-    zstringlen(class izstream&);
-    zstringlen(class ozstream&, const char*);
-    size_t value() const { return val.word; }
-private:
-    struct Val { unsigned char byte; size_t word; } val;
-};
-
-//  ----------------------------- izstream -----------------------------
-
-class izstream
-{
-    public:
-        izstream() : m_fp(0) {}
-        izstream(FILE* fp) : m_fp(0) { open(fp); }
-        izstream(const char* name) : m_fp(0) { open(name); }
-        ~izstream() { close(); }
-
-        /* Opens a gzip (.gz) file for reading.
-         * open() can be used to read a file which is not in gzip format;
-         * in this case read() will directly read from the file without
-         * decompression. errno can be checked to distinguish two error
-         * cases (if errno is zero, the zlib error is Z_MEM_ERROR).
-         */
-        void open(const char* name) {
-            if (m_fp) close();
-            m_fp = ::gzopen(name, "rb");
-        }
-
-        void open(FILE* fp) {
-            SET_BINARY_MODE(fp);
-            if (m_fp) close();
-            m_fp = ::gzdopen(fileno(fp), "rb");
-        }
-
-        /* Flushes all pending input if necessary, closes the compressed file
-         * and deallocates all the (de)compression state. The return value is
-         * the zlib error number (see function error() below).
-         */
-        int close() {
-            int r = ::gzclose(m_fp);
-            m_fp = 0; return r;
-        }
-
-        /* Binary read the given number of bytes from the compressed file.
-         */
-        int read(void* buf, size_t len) {
-            return ::gzread(m_fp, buf, len);
-        }
-
-        /* Returns the error message for the last error which occurred on the
-         * given compressed file. errnum is set to zlib error number. If an
-         * error occurred in the file system and not in the compression library,
-         * errnum is set to Z_ERRNO and the application may consult errno
-         * to get the exact error code.
-         */
-        const char* error(int* errnum) {
-            return ::gzerror(m_fp, errnum);
-        }
-
-        gzFile fp() { return m_fp; }
-
-    private:
-        gzFile m_fp;
-};
-
-/*
- * Binary read the given (array of) object(s) from the compressed file.
- * If the input file was not in gzip format, read() copies the objects number
- * of bytes into the buffer.
- * returns the number of uncompressed bytes actually read
- * (0 for end of file, -1 for error).
- */
-template <class T, class Items>
-inline int read(izstream& zs, T* x, Items items) {
-    return ::gzread(zs.fp(), x, items*sizeof(T));
-}
-
-/*
- * Binary input with the '>' operator.
- */
-template <class T>
-inline izstream& operator>(izstream& zs, T& x) {
-    ::gzread(zs.fp(), &x, sizeof(T));
-    return zs;
-}
-
-
-inline zstringlen::zstringlen(izstream& zs) {
-    zs > val.byte;
-    if (val.byte == 255) zs > val.word;
-    else val.word = val.byte;
-}
-
-/*
- * Read length of string + the string with the '>' operator.
- */
-inline izstream& operator>(izstream& zs, char* x) {
-    zstringlen len(zs);
-    ::gzread(zs.fp(), x, len.value());
-    x[len.value()] = '\0';
-    return zs;
-}
-
-inline char* read_string(izstream& zs) {
-    zstringlen len(zs);
-    char* x = new char[len.value()+1];
-    ::gzread(zs.fp(), x, len.value());
-    x[len.value()] = '\0';
-    return x;
-}
-
-// ----------------------------- ozstream -----------------------------
-
-class ozstream
-{
-    public:
-        ozstream() : m_fp(0), m_os(0) {
-        }
-        ozstream(FILE* fp, int level = Z_DEFAULT_COMPRESSION)
-            : m_fp(0), m_os(0) {
-            open(fp, level);
-        }
-        ozstream(const char* name, int level = Z_DEFAULT_COMPRESSION)
-            : m_fp(0), m_os(0) {
-            open(name, level);
-        }
-        ~ozstream() {
-            close();
-        }
-
-        /* Opens a gzip (.gz) file for writing.
-         * The compression level parameter should be in 0..9
-         * errno can be checked to distinguish two error cases
-         * (if errno is zero, the zlib error is Z_MEM_ERROR).
-         */
-        void open(const char* name, int level = Z_DEFAULT_COMPRESSION) {
-            char mode[4] = "wb\0";
-            if (level != Z_DEFAULT_COMPRESSION) mode[2] = '0'+level;
-            if (m_fp) close();
-            m_fp = ::gzopen(name, mode);
-        }
-
-        /* open from a FILE pointer.
-         */
-        void open(FILE* fp, int level = Z_DEFAULT_COMPRESSION) {
-            SET_BINARY_MODE(fp);
-            char mode[4] = "wb\0";
-            if (level != Z_DEFAULT_COMPRESSION) mode[2] = '0'+level;
-            if (m_fp) close();
-            m_fp = ::gzdopen(fileno(fp), mode);
-        }
-
-        /* Flushes all pending output if necessary, closes the compressed file
-         * and deallocates all the (de)compression state. The return value is
-         * the zlib error number (see function error() below).
-         */
-        int close() {
-            if (m_os) {
-                ::gzwrite(m_fp, m_os->str(), m_os->pcount());
-                delete[] m_os->str(); delete m_os; m_os = 0;
-            }
-            int r = ::gzclose(m_fp); m_fp = 0; return r;
-        }
-
-        /* Binary write the given number of bytes into the compressed file.
-         */
-        int write(const void* buf, size_t len) {
-            return ::gzwrite(m_fp, (voidp) buf, len);
-        }
-
-        /* Flushes all pending output into the compressed file. The parameter
-         * _flush is as in the deflate() function. The return value is the zlib
-         * error number (see function gzerror below). flush() returns Z_OK if
-         * the flush_ parameter is Z_FINISH and all output could be flushed.
-         * flush() should be called only when strictly necessary because it can
-         * degrade compression.
-         */
-        int flush(int _flush) {
-            os_flush();
-            return ::gzflush(m_fp, _flush);
-        }
-
-        /* Returns the error message for the last error which occurred on the
-         * given compressed file. errnum is set to zlib error number. If an
-         * error occurred in the file system and not in the compression library,
-         * errnum is set to Z_ERRNO and the application may consult errno
-         * to get the exact error code.
-         */
-        const char* error(int* errnum) {
-            return ::gzerror(m_fp, errnum);
-        }
-
-        gzFile fp() { return m_fp; }
-
-        ostream& os() {
-            if (m_os == 0) m_os = new ostrstream;
-            return *m_os;
-        }
-
-        void os_flush() {
-            if (m_os && m_os->pcount()>0) {
-                ostrstream* oss = new ostrstream;
-                oss->fill(m_os->fill());
-                oss->flags(m_os->flags());
-                oss->precision(m_os->precision());
-                oss->width(m_os->width());
-                ::gzwrite(m_fp, m_os->str(), m_os->pcount());
-                delete[] m_os->str(); delete m_os; m_os = oss;
-            }
-        }
-
-    private:
-        gzFile m_fp;
-        ostrstream* m_os;
-};
-
-/*
- * Binary write the given (array of) object(s) into the compressed file.
- * returns the number of uncompressed bytes actually written
- * (0 in case of error).
- */
-template <class T, class Items>
-inline int write(ozstream& zs, const T* x, Items items) {
-    return ::gzwrite(zs.fp(), (voidp) x, items*sizeof(T));
-}
-
-/*
- * Binary output with the '<' operator.
- */
-template <class T>
-inline ozstream& operator<(ozstream& zs, const T& x) {
-    ::gzwrite(zs.fp(), (voidp) &x, sizeof(T));
-    return zs;
-}
-
-inline zstringlen::zstringlen(ozstream& zs, const char* x) {
-    val.byte = 255;  val.word = ::strlen(x);
-    if (val.word < 255) zs < (val.byte = val.word);
-    else zs < val;
-}
-
-/*
- * Write length of string + the string with the '<' operator.
- */
-inline ozstream& operator<(ozstream& zs, const char* x) {
-    zstringlen len(zs, x);
-    ::gzwrite(zs.fp(), (voidp) x, len.value());
-    return zs;
-}
-
-#ifdef _MSC_VER
-inline ozstream& operator<(ozstream& zs, char* const& x) {
-    return zs < (const char*) x;
-}
-#endif
-
-/*
- * Ascii write with the << operator;
- */
-template <class T>
-inline ostream& operator<<(ozstream& zs, const T& x) {
-    zs.os_flush();
-    return zs.os() << x;
-}
-
-#endif
diff --git a/src/png/zlib/contrib/iostream2/zstream_test.cpp b/src/png/zlib/contrib/iostream2/zstream_test.cpp
deleted file mode 100644
index 6273f62d6..000000000
--- a/src/png/zlib/contrib/iostream2/zstream_test.cpp
+++ /dev/null
@@ -1,25 +0,0 @@
-#include "zstream.h"
-#include <math.h>
-#include <stdlib.h>
-#include <iomanip.h>
-
-void main() {
-    char h[256] = "Hello";
-    char* g = "Goodbye";
-    ozstream out("temp.gz");
-    out < "This works well" < h < g;
-    out.close();
-
-    izstream in("temp.gz"); // read it back
-    char *x = read_string(in), *y = new char[256], z[256];
-    in > y > z;
-    in.close();
-    cout << x << endl << y << endl << z << endl;
-
-    out.open("temp.gz"); // try ascii output; zcat temp.gz to see the results
-    out << setw(50) << setfill('#') << setprecision(20) << x << endl << y << endl << z << endl;
-    out << z << endl << y << endl << x << endl;
-    out << 1.1234567890123456789 << endl;
-
-    delete[] x; delete[] y;
-}
diff --git a/src/png/zlib/contrib/iostream3/README b/src/png/zlib/contrib/iostream3/README
deleted file mode 100644
index f7b319ab9..000000000
--- a/src/png/zlib/contrib/iostream3/README
+++ /dev/null
@@ -1,35 +0,0 @@
-These classes provide a C++ stream interface to the zlib library. It allows you
-to do things like:
-
-  gzofstream outf("blah.gz");
-  outf << "These go into the gzip file " << 123 << endl;
-
-It does this by deriving a specialized stream buffer for gzipped files, which is
-the way Stroustrup would have done it. :->
-
-The gzifstream and gzofstream classes were originally written by Kevin Ruland
-and made available in the zlib contrib/iostream directory. The older version still
-compiles under gcc 2.xx, but not under gcc 3.xx, which sparked the development of
-this version.
-
-The new classes are as standard-compliant as possible, closely following the
-approach of the standard library's fstream classes. It compiles under gcc versions
-3.2 and 3.3, but not under gcc 2.xx. This is mainly due to changes in the standard
-library naming scheme. The new version of gzifstream/gzofstream/gzfilebuf differs
-from the previous one in the following respects:
-- added showmanyc
-- added setbuf, with support for unbuffered output via setbuf(0,0)
-- a few bug fixes of stream behavior
-- gzipped output file opened with default compression level instead of maximum level
-- setcompressionlevel()/strategy() members replaced by single setcompression()
-
-The code is provided "as is", with the permission to use, copy, modify, distribute
-and sell it for any purpose without fee.
-
-Ludwig Schwardt
-<schwardt@sun.ac.za>
-
-DSP Lab
-Electrical & Electronic Engineering Department
-University of Stellenbosch
-South Africa
diff --git a/src/png/zlib/contrib/iostream3/TODO b/src/png/zlib/contrib/iostream3/TODO
deleted file mode 100644
index 7032f97be..000000000
--- a/src/png/zlib/contrib/iostream3/TODO
+++ /dev/null
@@ -1,17 +0,0 @@
-Possible upgrades to gzfilebuf:
-
-- The ability to do putback (e.g. putbackfail)
-
-- The ability to seek (zlib supports this, but could be slow/tricky)
-
-- Simultaneous read/write access (does it make sense?)
-
-- Support for ios_base::ate open mode
-
-- Locale support?
-
-- Check public interface to see which calls give problems
-  (due to dependence on library internals)
-
-- Override operator<<(ostream&, gzfilebuf*) to allow direct copying
-  of stream buffer to stream ( i.e. os << is.rdbuf(); )
diff --git a/src/png/zlib/contrib/iostream3/test.cc b/src/png/zlib/contrib/iostream3/test.cc
deleted file mode 100644
index 94235334f..000000000
--- a/src/png/zlib/contrib/iostream3/test.cc
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * Test program for gzifstream and gzofstream
- *
- * by Ludwig Schwardt <schwardt@sun.ac.za>
- * original version by Kevin Ruland <kevin@rodin.wustl.edu>
- */
-
-#include "zfstream.h"
-#include <iostream>      // for cout
-
-int main() {
-
-  gzofstream outf;
-  gzifstream inf;
-  char buf[80];
-
-  outf.open("test1.txt.gz");
-  outf << "The quick brown fox sidestepped the lazy canine\n"
-       << 1.3 << "\nPlan " << 9 << std::endl;
-  outf.close();
-  std::cout << "Wrote the following message to 'test1.txt.gz' (check with zcat or zless):\n"
-            << "The quick brown fox sidestepped the lazy canine\n"
-            << 1.3 << "\nPlan " << 9 << std::endl;
-
-  std::cout << "\nReading 'test1.txt.gz' (buffered) produces:\n";
-  inf.open("test1.txt.gz");
-  while (inf.getline(buf,80,'\n')) {
-    std::cout << buf << "\t(" << inf.rdbuf()->in_avail() << " chars left in buffer)\n";
-  }
-  inf.close();
-
-  outf.rdbuf()->pubsetbuf(0,0);
-  outf.open("test2.txt.gz");
-  outf << setcompression(Z_NO_COMPRESSION)
-       << "The quick brown fox sidestepped the lazy canine\n"
-       << 1.3 << "\nPlan " << 9 << std::endl;
-  outf.close();
-  std::cout << "\nWrote the same message to 'test2.txt.gz' in uncompressed form";
-
-  std::cout << "\nReading 'test2.txt.gz' (unbuffered) produces:\n";
-  inf.rdbuf()->pubsetbuf(0,0);
-  inf.open("test2.txt.gz");
-  while (inf.getline(buf,80,'\n')) {
-    std::cout << buf << "\t(" << inf.rdbuf()->in_avail() << " chars left in buffer)\n";
-  }
-  inf.close();
-
-  return 0;
-
-}
diff --git a/src/png/zlib/contrib/iostream3/zfstream.cc b/src/png/zlib/contrib/iostream3/zfstream.cc
deleted file mode 100644
index 94eb93344..000000000
--- a/src/png/zlib/contrib/iostream3/zfstream.cc
+++ /dev/null
@@ -1,479 +0,0 @@
-/*
- * A C++ I/O streams interface to the zlib gz* functions
- *
- * by Ludwig Schwardt <schwardt@sun.ac.za>
- * original version by Kevin Ruland <kevin@rodin.wustl.edu>
- *
- * This version is standard-compliant and compatible with gcc 3.x.
- */
-
-#include "zfstream.h"
-#include <cstring>          // for strcpy, strcat, strlen (mode strings)
-#include <cstdio>           // for BUFSIZ
-
-// Internal buffer sizes (default and "unbuffered" versions)
-#define BIGBUFSIZE BUFSIZ
-#define SMALLBUFSIZE 1
-
-/*****************************************************************************/
-
-// Default constructor
-gzfilebuf::gzfilebuf()
-: file(NULL), io_mode(std::ios_base::openmode(0)), own_fd(false),
-  buffer(NULL), buffer_size(BIGBUFSIZE), own_buffer(true)
-{
-  // No buffers to start with
-  this->disable_buffer();
-}
-
-// Destructor
-gzfilebuf::~gzfilebuf()
-{
-  // Sync output buffer and close only if responsible for file
-  // (i.e. attached streams should be left open at this stage)
-  this->sync();
-  if (own_fd)
-    this->close();
-  // Make sure internal buffer is deallocated
-  this->disable_buffer();
-}
-
-// Set compression level and strategy
-int
-gzfilebuf::setcompression(int comp_level,
-                          int comp_strategy)
-{
-  return gzsetparams(file, comp_level, comp_strategy);
-}
-
-// Open gzipped file
-gzfilebuf*
-gzfilebuf::open(const char *name,
-                std::ios_base::openmode mode)
-{
-  // Fail if file already open
-  if (this->is_open())
-    return NULL;
-  // Don't support simultaneous read/write access (yet)
-  if ((mode & std::ios_base::in) && (mode & std::ios_base::out))
-    return NULL;
-
-  // Build mode string for gzopen and check it [27.8.1.3.2]
-  char char_mode[6] = "\0\0\0\0\0";
-  if (!this->open_mode(mode, char_mode))
-    return NULL;
-
-  // Attempt to open file
-  if ((file = gzopen(name, char_mode)) == NULL)
-    return NULL;
-
-  // On success, allocate internal buffer and set flags
-  this->enable_buffer();
-  io_mode = mode;
-  own_fd = true;
-  return this;
-}
-
-// Attach to gzipped file
-gzfilebuf*
-gzfilebuf::attach(int fd,
-                  std::ios_base::openmode mode)
-{
-  // Fail if file already open
-  if (this->is_open())
-    return NULL;
-  // Don't support simultaneous read/write access (yet)
-  if ((mode & std::ios_base::in) && (mode & std::ios_base::out))
-    return NULL;
-
-  // Build mode string for gzdopen and check it [27.8.1.3.2]
-  char char_mode[6] = "\0\0\0\0\0";
-  if (!this->open_mode(mode, char_mode))
-    return NULL;
-
-  // Attempt to attach to file
-  if ((file = gzdopen(fd, char_mode)) == NULL)
-    return NULL;
-
-  // On success, allocate internal buffer and set flags
-  this->enable_buffer();
-  io_mode = mode;
-  own_fd = false;
-  return this;
-}
-
-// Close gzipped file
-gzfilebuf*
-gzfilebuf::close()
-{
-  // Fail immediately if no file is open
-  if (!this->is_open())
-    return NULL;
-  // Assume success
-  gzfilebuf* retval = this;
-  // Attempt to sync and close gzipped file
-  if (this->sync() == -1)
-    retval = NULL;
-  if (gzclose(file) < 0)
-    retval = NULL;
-  // File is now gone anyway (postcondition [27.8.1.3.8])
-  file = NULL;
-  own_fd = false;
-  // Destroy internal buffer if it exists
-  this->disable_buffer();
-  return retval;
-}
-
-/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
-
-// Convert int open mode to mode string
-bool
-gzfilebuf::open_mode(std::ios_base::openmode mode,
-                     char* c_mode) const
-{
-  bool testb = mode & std::ios_base::binary;
-  bool testi = mode & std::ios_base::in;
-  bool testo = mode & std::ios_base::out;
-  bool testt = mode & std::ios_base::trunc;
-  bool testa = mode & std::ios_base::app;
-
-  // Check for valid flag combinations - see [27.8.1.3.2] (Table 92)
-  // Original zfstream hardcoded the compression level to maximum here...
-  // Double the time for less than 1% size improvement seems
-  // excessive though - keeping it at the default level
-  // To change back, just append "9" to the next three mode strings
-  if (!testi && testo && !testt && !testa)
-    strcpy(c_mode, "w");
-  if (!testi && testo && !testt && testa)
-    strcpy(c_mode, "a");
-  if (!testi && testo && testt && !testa)
-    strcpy(c_mode, "w");
-  if (testi && !testo && !testt && !testa)
-    strcpy(c_mode, "r");
-  // No read/write mode yet
-//  if (testi && testo && !testt && !testa)
-//    strcpy(c_mode, "r+");
-//  if (testi && testo && testt && !testa)
-//    strcpy(c_mode, "w+");
-
-  // Mode string should be empty for invalid combination of flags
-  if (strlen(c_mode) == 0)
-    return false;
-  if (testb)
-    strcat(c_mode, "b");
-  return true;
-}
-
-// Determine number of characters in internal get buffer
-std::streamsize
-gzfilebuf::showmanyc()
-{
-  // Calls to underflow will fail if file not opened for reading
-  if (!this->is_open() || !(io_mode & std::ios_base::in))
-    return -1;
-  // Make sure get area is in use
-  if (this->gptr() && (this->gptr() < this->egptr()))
-    return std::streamsize(this->egptr() - this->gptr());
-  else
-    return 0;
-}
-
-// Fill get area from gzipped file
-gzfilebuf::int_type
-gzfilebuf::underflow()
-{
-  // If something is left in the get area by chance, return it
-  // (this shouldn't normally happen, as underflow is only supposed
-  // to be called when gptr >= egptr, but it serves as error check)
-  if (this->gptr() && (this->gptr() < this->egptr()))
-    return traits_type::to_int_type(*(this->gptr()));
-
-  // If the file hasn't been opened for reading, produce error
-  if (!this->is_open() || !(io_mode & std::ios_base::in))
-    return traits_type::eof();
-
-  // Attempt to fill internal buffer from gzipped file
-  // (buffer must be guaranteed to exist...)
-  int bytes_read = gzread(file, buffer, buffer_size);
-  // Indicates error or EOF
-  if (bytes_read <= 0)
-  {
-    // Reset get area
-    this->setg(buffer, buffer, buffer);
-    return traits_type::eof();
-  }
-  // Make all bytes read from file available as get area
-  this->setg(buffer, buffer, buffer + bytes_read);
-
-  // Return next character in get area
-  return traits_type::to_int_type(*(this->gptr()));
-}
-
-// Write put area to gzipped file
-gzfilebuf::int_type
-gzfilebuf::overflow(int_type c)
-{
-  // Determine whether put area is in use
-  if (this->pbase())
-  {
-    // Double-check pointer range
-    if (this->pptr() > this->epptr() || this->pptr() < this->pbase())
-      return traits_type::eof();
-    // Add extra character to buffer if not EOF
-    if (!traits_type::eq_int_type(c, traits_type::eof()))
-    {
-      *(this->pptr()) = traits_type::to_char_type(c);
-      this->pbump(1);
-    }
-    // Number of characters to write to file
-    int bytes_to_write = this->pptr() - this->pbase();
-    // Overflow doesn't fail if nothing is to be written
-    if (bytes_to_write > 0)
-    {
-      // If the file hasn't been opened for writing, produce error
-      if (!this->is_open() || !(io_mode & std::ios_base::out))
-        return traits_type::eof();
-      // If gzipped file won't accept all bytes written to it, fail
-      if (gzwrite(file, this->pbase(), bytes_to_write) != bytes_to_write)
-        return traits_type::eof();
-      // Reset next pointer to point to pbase on success
-      this->pbump(-bytes_to_write);
-    }
-  }
-  // Write extra character to file if not EOF
-  else if (!traits_type::eq_int_type(c, traits_type::eof()))
-  {
-    // If the file hasn't been opened for writing, produce error
-    if (!this->is_open() || !(io_mode & std::ios_base::out))
-      return traits_type::eof();
-    // Impromptu char buffer (allows "unbuffered" output)
-    char_type last_char = traits_type::to_char_type(c);
-    // If gzipped file won't accept this character, fail
-    if (gzwrite(file, &last_char, 1) != 1)
-      return traits_type::eof();
-  }
-
-  // If you got here, you have succeeded (even if c was EOF)
-  // The return value should therefore be non-EOF
-  if (traits_type::eq_int_type(c, traits_type::eof()))
-    return traits_type::not_eof(c);
-  else
-    return c;
-}
-
-// Assign new buffer
-std::streambuf*
-gzfilebuf::setbuf(char_type* p,
-                  std::streamsize n)
-{
-  // First make sure stuff is sync'ed, for safety
-  if (this->sync() == -1)
-    return NULL;
-  // If buffering is turned off on purpose via setbuf(0,0), still allocate one...
-  // "Unbuffered" only really refers to put [27.8.1.4.10], while get needs at
-  // least a buffer of size 1 (very inefficient though, therefore make it bigger?)
-  // This follows from [27.5.2.4.3]/12 (gptr needs to point at something, it seems)
-  if (!p || !n)
-  {
-    // Replace existing buffer (if any) with small internal buffer
-    this->disable_buffer();
-    buffer = NULL;
-    buffer_size = 0;
-    own_buffer = true;
-    this->enable_buffer();
-  }
-  else
-  {
-    // Replace existing buffer (if any) with external buffer
-    this->disable_buffer();
-    buffer = p;
-    buffer_size = n;
-    own_buffer = false;
-    this->enable_buffer();
-  }
-  return this;
-}
-
-// Write put area to gzipped file (i.e. ensures that put area is empty)
-int
-gzfilebuf::sync()
-{
-  return traits_type::eq_int_type(this->overflow(), traits_type::eof()) ? -1 : 0;
-}
-
-/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
-
-// Allocate internal buffer
-void
-gzfilebuf::enable_buffer()
-{
-  // If internal buffer required, allocate one
-  if (own_buffer && !buffer)
-  {
-    // Check for buffered vs. "unbuffered"
-    if (buffer_size > 0)
-    {
-      // Allocate internal buffer
-      buffer = new char_type[buffer_size];
-      // Get area starts empty and will be expanded by underflow as need arises
-      this->setg(buffer, buffer, buffer);
-      // Setup entire internal buffer as put area.
-      // The one-past-end pointer actually points to the last element of the buffer,
-      // so that overflow(c) can safely add the extra character c to the sequence.
-      // These pointers remain in place for the duration of the buffer
-      this->setp(buffer, buffer + buffer_size - 1);
-    }
-    else
-    {
-      // Even in "unbuffered" case, (small?) get buffer is still required
-      buffer_size = SMALLBUFSIZE;
-      buffer = new char_type[buffer_size];
-      this->setg(buffer, buffer, buffer);
-      // "Unbuffered" means no put buffer
-      this->setp(0, 0);
-    }
-  }
-  else
-  {
-    // If buffer already allocated, reset buffer pointers just to make sure no
-    // stale chars are lying around
-    this->setg(buffer, buffer, buffer);
-    this->setp(buffer, buffer + buffer_size - 1);
-  }
-}
-
-// Destroy internal buffer
-void
-gzfilebuf::disable_buffer()
-{
-  // If internal buffer exists, deallocate it
-  if (own_buffer && buffer)
-  {
-    // Preserve unbuffered status by zeroing size
-    if (!this->pbase())
-      buffer_size = 0;
-    delete[] buffer;
-    buffer = NULL;
-    this->setg(0, 0, 0);
-    this->setp(0, 0);
-  }
-  else
-  {
-    // Reset buffer pointers to initial state if external buffer exists
-    this->setg(buffer, buffer, buffer);
-    if (buffer)
-      this->setp(buffer, buffer + buffer_size - 1);
-    else
-      this->setp(0, 0);
-  }
-}
-
-/*****************************************************************************/
-
-// Default constructor initializes stream buffer
-gzifstream::gzifstream()
-: std::istream(NULL), sb()
-{ this->init(&sb); }
-
-// Initialize stream buffer and open file
-gzifstream::gzifstream(const char* name,
-                       std::ios_base::openmode mode)
-: std::istream(NULL), sb()
-{
-  this->init(&sb);
-  this->open(name, mode);
-}
-
-// Initialize stream buffer and attach to file
-gzifstream::gzifstream(int fd,
-                       std::ios_base::openmode mode)
-: std::istream(NULL), sb()
-{
-  this->init(&sb);
-  this->attach(fd, mode);
-}
-
-// Open file and go into fail() state if unsuccessful
-void
-gzifstream::open(const char* name,
-                 std::ios_base::openmode mode)
-{
-  if (!sb.open(name, mode | std::ios_base::in))
-    this->setstate(std::ios_base::failbit);
-  else
-    this->clear();
-}
-
-// Attach to file and go into fail() state if unsuccessful
-void
-gzifstream::attach(int fd,
-                   std::ios_base::openmode mode)
-{
-  if (!sb.attach(fd, mode | std::ios_base::in))
-    this->setstate(std::ios_base::failbit);
-  else
-    this->clear();
-}
-
-// Close file
-void
-gzifstream::close()
-{
-  if (!sb.close())
-    this->setstate(std::ios_base::failbit);
-}
-
-/*****************************************************************************/
-
-// Default constructor initializes stream buffer
-gzofstream::gzofstream()
-: std::ostream(NULL), sb()
-{ this->init(&sb); }
-
-// Initialize stream buffer and open file
-gzofstream::gzofstream(const char* name,
-                       std::ios_base::openmode mode)
-: std::ostream(NULL), sb()
-{
-  this->init(&sb);
-  this->open(name, mode);
-}
-
-// Initialize stream buffer and attach to file
-gzofstream::gzofstream(int fd,
-                       std::ios_base::openmode mode)
-: std::ostream(NULL), sb()
-{
-  this->init(&sb);
-  this->attach(fd, mode);
-}
-
-// Open file and go into fail() state if unsuccessful
-void
-gzofstream::open(const char* name,
-                 std::ios_base::openmode mode)
-{
-  if (!sb.open(name, mode | std::ios_base::out))
-    this->setstate(std::ios_base::failbit);
-  else
-    this->clear();
-}
-
-// Attach to file and go into fail() state if unsuccessful
-void
-gzofstream::attach(int fd,
-                   std::ios_base::openmode mode)
-{
-  if (!sb.attach(fd, mode | std::ios_base::out))
-    this->setstate(std::ios_base::failbit);
-  else
-    this->clear();
-}
-
-// Close file
-void
-gzofstream::close()
-{
-  if (!sb.close())
-    this->setstate(std::ios_base::failbit);
-}
diff --git a/src/png/zlib/contrib/iostream3/zfstream.h b/src/png/zlib/contrib/iostream3/zfstream.h
deleted file mode 100644
index 8574479ae..000000000
--- a/src/png/zlib/contrib/iostream3/zfstream.h
+++ /dev/null
@@ -1,466 +0,0 @@
-/*
- * A C++ I/O streams interface to the zlib gz* functions
- *
- * by Ludwig Schwardt <schwardt@sun.ac.za>
- * original version by Kevin Ruland <kevin@rodin.wustl.edu>
- *
- * This version is standard-compliant and compatible with gcc 3.x.
- */
-
-#ifndef ZFSTREAM_H
-#define ZFSTREAM_H
-
-#include <istream>  // not iostream, since we don't need cin/cout
-#include <ostream>
-#include "zlib.h"
-
-/*****************************************************************************/
-
-/**
- *  @brief  Gzipped file stream buffer class.
- *
- *  This class implements basic_filebuf for gzipped files. It doesn't yet support
- *  seeking (allowed by zlib but slow/limited), putback and read/write access
- *  (tricky). Otherwise, it attempts to be a drop-in replacement for the standard
- *  file streambuf.
-*/
-class gzfilebuf : public std::streambuf
-{
-public:
-  //  Default constructor.
-  gzfilebuf();
-
-  //  Destructor.
-  virtual
-  ~gzfilebuf();
-
-  /**
-   *  @brief  Set compression level and strategy on the fly.
-   *  @param  comp_level  Compression level (see zlib.h for allowed values)
-   *  @param  comp_strategy  Compression strategy (see zlib.h for allowed values)
-   *  @return  Z_OK on success, Z_STREAM_ERROR otherwise.
-   *
-   *  Unfortunately, these parameters cannot be modified separately, as the
-   *  previous zfstream version assumed. Since the strategy is seldom changed,
-   *  it can default and setcompression(level) then becomes like the old
-   *  setcompressionlevel(level).
-  */
-  int
-  setcompression(int comp_level,
-                 int comp_strategy = Z_DEFAULT_STRATEGY);
-
-  /**
-   *  @brief  Check if file is open.
-   *  @return  True if file is open.
-  */
-  bool
-  is_open() const { return (file != NULL); }
-
-  /**
-   *  @brief  Open gzipped file.
-   *  @param  name  File name.
-   *  @param  mode  Open mode flags.
-   *  @return  @c this on success, NULL on failure.
-  */
-  gzfilebuf*
-  open(const char* name,
-       std::ios_base::openmode mode);
-
-  /**
-   *  @brief  Attach to already open gzipped file.
-   *  @param  fd  File descriptor.
-   *  @param  mode  Open mode flags.
-   *  @return  @c this on success, NULL on failure.
-  */
-  gzfilebuf*
-  attach(int fd,
-         std::ios_base::openmode mode);
-
-  /**
-   *  @brief  Close gzipped file.
-   *  @return  @c this on success, NULL on failure.
-  */
-  gzfilebuf*
-  close();
-
-protected:
-  /**
-   *  @brief  Convert ios open mode int to mode string used by zlib.
-   *  @return  True if valid mode flag combination.
-  */
-  bool
-  open_mode(std::ios_base::openmode mode,
-            char* c_mode) const;
-
-  /**
-   *  @brief  Number of characters available in stream buffer.
-   *  @return  Number of characters.
-   *
-   *  This indicates number of characters in get area of stream buffer.
-   *  These characters can be read without accessing the gzipped file.
-  */
-  virtual std::streamsize
-  showmanyc();
-
-  /**
-   *  @brief  Fill get area from gzipped file.
-   *  @return  First character in get area on success, EOF on error.
-   *
-   *  This actually reads characters from gzipped file to stream
-   *  buffer. Always buffered.
-  */
-  virtual int_type
-  underflow();
-
-  /**
-   *  @brief  Write put area to gzipped file.
-   *  @param  c  Extra character to add to buffer contents.
-   *  @return  Non-EOF on success, EOF on error.
-   *
-   *  This actually writes characters in stream buffer to
-   *  gzipped file. With unbuffered output this is done one
-   *  character at a time.
-  */
-  virtual int_type
-  overflow(int_type c = traits_type::eof());
-
-  /**
-   *  @brief  Installs external stream buffer.
-   *  @param  p  Pointer to char buffer.
-   *  @param  n  Size of external buffer.
-   *  @return  @c this on success, NULL on failure.
-   *
-   *  Call setbuf(0,0) to enable unbuffered output.
-  */
-  virtual std::streambuf*
-  setbuf(char_type* p,
-         std::streamsize n);
-
-  /**
-   *  @brief  Flush stream buffer to file.
-   *  @return  0 on success, -1 on error.
-   *
-   *  This calls underflow(EOF) to do the job.
-  */
-  virtual int
-  sync();
-
-//
-// Some future enhancements
-//
-//  virtual int_type uflow();
-//  virtual int_type pbackfail(int_type c = traits_type::eof());
-//  virtual pos_type
-//  seekoff(off_type off,
-//          std::ios_base::seekdir way,
-//          std::ios_base::openmode mode = std::ios_base::in|std::ios_base::out);
-//  virtual pos_type
-//  seekpos(pos_type sp,
-//          std::ios_base::openmode mode = std::ios_base::in|std::ios_base::out);
-
-private:
-  /**
-   *  @brief  Allocate internal buffer.
-   *
-   *  This function is safe to call multiple times. It will ensure
-   *  that a proper internal buffer exists if it is required. If the
-   *  buffer already exists or is external, the buffer pointers will be
-   *  reset to their original state.
-  */
-  void
-  enable_buffer();
-
-  /**
-   *  @brief  Destroy internal buffer.
-   *
-   *  This function is safe to call multiple times. It will ensure
-   *  that the internal buffer is deallocated if it exists. In any
-   *  case, it will also reset the buffer pointers.
-  */
-  void
-  disable_buffer();
-
-  /**
-   *  Underlying file pointer.
-  */
-  gzFile file;
-
-  /**
-   *  Mode in which file was opened.
-  */
-  std::ios_base::openmode io_mode;
-
-  /**
-   *  @brief  True if this object owns file descriptor.
-   *
-   *  This makes the class responsible for closing the file
-   *  upon destruction.
-  */
-  bool own_fd;
-
-  /**
-   *  @brief  Stream buffer.
-   *
-   *  For simplicity this remains allocated on the free store for the
-   *  entire life span of the gzfilebuf object, unless replaced by setbuf.
-  */
-  char_type* buffer;
-
-  /**
-   *  @brief  Stream buffer size.
-   *
-   *  Defaults to system default buffer size (typically 8192 bytes).
-   *  Modified by setbuf.
-  */
-  std::streamsize buffer_size;
-
-  /**
-   *  @brief  True if this object owns stream buffer.
-   *
-   *  This makes the class responsible for deleting the buffer
-   *  upon destruction.
-  */
-  bool own_buffer;
-};
-
-/*****************************************************************************/
-
-/**
- *  @brief  Gzipped file input stream class.
- *
- *  This class implements ifstream for gzipped files. Seeking and putback
- *  is not supported yet.
-*/
-class gzifstream : public std::istream
-{
-public:
-  //  Default constructor
-  gzifstream();
-
-  /**
-   *  @brief  Construct stream on gzipped file to be opened.
-   *  @param  name  File name.
-   *  @param  mode  Open mode flags (forced to contain ios::in).
-  */
-  explicit
-  gzifstream(const char* name,
-             std::ios_base::openmode mode = std::ios_base::in);
-
-  /**
-   *  @brief  Construct stream on already open gzipped file.
-   *  @param  fd    File descriptor.
-   *  @param  mode  Open mode flags (forced to contain ios::in).
-  */
-  explicit
-  gzifstream(int fd,
-             std::ios_base::openmode mode = std::ios_base::in);
-
-  /**
-   *  Obtain underlying stream buffer.
-  */
-  gzfilebuf*
-  rdbuf() const
-  { return const_cast<gzfilebuf*>(&sb); }
-
-  /**
-   *  @brief  Check if file is open.
-   *  @return  True if file is open.
-  */
-  bool
-  is_open() { return sb.is_open(); }
-
-  /**
-   *  @brief  Open gzipped file.
-   *  @param  name  File name.
-   *  @param  mode  Open mode flags (forced to contain ios::in).
-   *
-   *  Stream will be in state good() if file opens successfully;
-   *  otherwise in state fail(). This differs from the behavior of
-   *  ifstream, which never sets the state to good() and therefore
-   *  won't allow you to reuse the stream for a second file unless
-   *  you manually clear() the state. The choice is a matter of
-   *  convenience.
-  */
-  void
-  open(const char* name,
-       std::ios_base::openmode mode = std::ios_base::in);
-
-  /**
-   *  @brief  Attach to already open gzipped file.
-   *  @param  fd  File descriptor.
-   *  @param  mode  Open mode flags (forced to contain ios::in).
-   *
-   *  Stream will be in state good() if attach succeeded; otherwise
-   *  in state fail().
-  */
-  void
-  attach(int fd,
-         std::ios_base::openmode mode = std::ios_base::in);
-
-  /**
-   *  @brief  Close gzipped file.
-   *
-   *  Stream will be in state fail() if close failed.
-  */
-  void
-  close();
-
-private:
-  /**
-   *  Underlying stream buffer.
-  */
-  gzfilebuf sb;
-};
-
-/*****************************************************************************/
-
-/**
- *  @brief  Gzipped file output stream class.
- *
- *  This class implements ofstream for gzipped files. Seeking and putback
- *  is not supported yet.
-*/
-class gzofstream : public std::ostream
-{
-public:
-  //  Default constructor
-  gzofstream();
-
-  /**
-   *  @brief  Construct stream on gzipped file to be opened.
-   *  @param  name  File name.
-   *  @param  mode  Open mode flags (forced to contain ios::out).
-  */
-  explicit
-  gzofstream(const char* name,
-             std::ios_base::openmode mode = std::ios_base::out);
-
-  /**
-   *  @brief  Construct stream on already open gzipped file.
-   *  @param  fd    File descriptor.
-   *  @param  mode  Open mode flags (forced to contain ios::out).
-  */
-  explicit
-  gzofstream(int fd,
-             std::ios_base::openmode mode = std::ios_base::out);
-
-  /**
-   *  Obtain underlying stream buffer.
-  */
-  gzfilebuf*
-  rdbuf() const
-  { return const_cast<gzfilebuf*>(&sb); }
-
-  /**
-   *  @brief  Check if file is open.
-   *  @return  True if file is open.
-  */
-  bool
-  is_open() { return sb.is_open(); }
-
-  /**
-   *  @brief  Open gzipped file.
-   *  @param  name  File name.
-   *  @param  mode  Open mode flags (forced to contain ios::out).
-   *
-   *  Stream will be in state good() if file opens successfully;
-   *  otherwise in state fail(). This differs from the behavior of
-   *  ofstream, which never sets the state to good() and therefore
-   *  won't allow you to reuse the stream for a second file unless
-   *  you manually clear() the state. The choice is a matter of
-   *  convenience.
-  */
-  void
-  open(const char* name,
-       std::ios_base::openmode mode = std::ios_base::out);
-
-  /**
-   *  @brief  Attach to already open gzipped file.
-   *  @param  fd  File descriptor.
-   *  @param  mode  Open mode flags (forced to contain ios::out).
-   *
-   *  Stream will be in state good() if attach succeeded; otherwise
-   *  in state fail().
-  */
-  void
-  attach(int fd,
-         std::ios_base::openmode mode = std::ios_base::out);
-
-  /**
-   *  @brief  Close gzipped file.
-   *
-   *  Stream will be in state fail() if close failed.
-  */
-  void
-  close();
-
-private:
-  /**
-   *  Underlying stream buffer.
-  */
-  gzfilebuf sb;
-};
-
-/*****************************************************************************/
-
-/**
- *  @brief  Gzipped file output stream manipulator class.
- *
- *  This class defines a two-argument manipulator for gzofstream. It is used
- *  as base for the setcompression(int,int) manipulator.
-*/
-template<typename T1, typename T2>
-  class gzomanip2
-  {
-  public:
-    // Allows insertor to peek at internals
-    template <typename Ta, typename Tb>
-      friend gzofstream&
-      operator<<(gzofstream&,
-                 const gzomanip2<Ta,Tb>&);
-
-    // Constructor
-    gzomanip2(gzofstream& (*f)(gzofstream&, T1, T2),
-              T1 v1,
-              T2 v2);
-  private:
-    // Underlying manipulator function
-    gzofstream&
-    (*func)(gzofstream&, T1, T2);
-
-    // Arguments for manipulator function
-    T1 val1;
-    T2 val2;
-  };
-
-/*****************************************************************************/
-
-// Manipulator function thunks through to stream buffer
-inline gzofstream&
-setcompression(gzofstream &gzs, int l, int s = Z_DEFAULT_STRATEGY)
-{
-  (gzs.rdbuf())->setcompression(l, s);
-  return gzs;
-}
-
-// Manipulator constructor stores arguments
-template<typename T1, typename T2>
-  inline
-  gzomanip2<T1,T2>::gzomanip2(gzofstream &(*f)(gzofstream &, T1, T2),
-                              T1 v1,
-                              T2 v2)
-  : func(f), val1(v1), val2(v2)
-  { }
-
-// Insertor applies underlying manipulator function to stream
-template<typename T1, typename T2>
-  inline gzofstream&
-  operator<<(gzofstream& s, const gzomanip2<T1,T2>& m)
-  { return (*m.func)(s, m.val1, m.val2); }
-
-// Insert this onto stream to simplify setting of compression level
-inline gzomanip2<int,int>
-setcompression(int l, int s = Z_DEFAULT_STRATEGY)
-{ return gzomanip2<int,int>(&setcompression, l, s); }
-
-#endif // ZFSTREAM_H
diff --git a/src/png/zlib/contrib/masmx64/bld_ml64.bat b/src/png/zlib/contrib/masmx64/bld_ml64.bat
deleted file mode 100644
index f74bcef5b..000000000
--- a/src/png/zlib/contrib/masmx64/bld_ml64.bat
+++ /dev/null
@@ -1,2 +0,0 @@
-ml64.exe /Flinffasx64 /c /Zi inffasx64.asm
-ml64.exe /Flgvmat64   /c /Zi gvmat64.asm
diff --git a/src/png/zlib/contrib/masmx64/gvmat64.asm b/src/png/zlib/contrib/masmx64/gvmat64.asm
deleted file mode 100644
index c1817f1be..000000000
--- a/src/png/zlib/contrib/masmx64/gvmat64.asm
+++ /dev/null
@@ -1,553 +0,0 @@
-;uInt longest_match_x64(
-;    deflate_state *s,
-;    IPos cur_match);                             /* current match */
-
-; gvmat64.asm -- Asm portion of the optimized longest_match for 32 bits x86_64
-;  (AMD64 on Athlon 64, Opteron, Phenom
-;     and Intel EM64T on Pentium 4 with EM64T, Pentium D, Core 2 Duo, Core I5/I7)
-; Copyright (C) 1995-2010 Jean-loup Gailly, Brian Raiter and Gilles Vollant.
-;
-; File written by Gilles Vollant, by converting to assembly the longest_match
-;  from Jean-loup Gailly in deflate.c of zLib and infoZip zip.
-;
-;  and by taking inspiration on asm686 with masm, optimised assembly code
-;        from Brian Raiter, written 1998
-;
-;  This software is provided 'as-is', without any express or implied
-;  warranty.  In no event will the authors be held liable for any damages
-;  arising from the use of this software.
-;
-;  Permission is granted to anyone to use this software for any purpose,
-;  including commercial applications, and to alter it and redistribute it
-;  freely, subject to the following restrictions:
-;
-;  1. The origin of this software must not be misrepresented; you must not
-;     claim that you wrote the original software. If you use this software
-;     in a product, an acknowledgment in the product documentation would be
-;     appreciated but is not required.
-;  2. Altered source versions must be plainly marked as such, and must not be
-;     misrepresented as being the original software
-;  3. This notice may not be removed or altered from any source distribution.
-;
-;
-;
-;         http://www.zlib.net
-;         http://www.winimage.com/zLibDll
-;         http://www.muppetlabs.com/~breadbox/software/assembly.html
-;
-; to compile this file for infozip Zip, I use option:
-;   ml64.exe /Flgvmat64 /c /Zi /DINFOZIP gvmat64.asm
-;
-; to compile this file for zLib, I use option:
-;   ml64.exe /Flgvmat64 /c /Zi gvmat64.asm
-; Be carrefull to adapt zlib1222add below to your version of zLib
-;   (if you use a version of zLib before 1.0.4 or after 1.2.2.2, change
-;    value of zlib1222add later)
-;
-; This file compile with Microsoft Macro Assembler (x64) for AMD64
-;
-;   ml64.exe is given with Visual Studio 2005/2008/2010 and Windows WDK
-;
-;   (you can get Windows WDK with ml64 for AMD64 from
-;      http://www.microsoft.com/whdc/Devtools/wdk/default.mspx for low price)
-;
-
-
-;uInt longest_match(s, cur_match)
-;    deflate_state *s;
-;    IPos cur_match;                             /* current match */
-.code
-longest_match PROC
-
-
-;LocalVarsSize   equ 88
- LocalVarsSize   equ 72
-
-; register used : rax,rbx,rcx,rdx,rsi,rdi,r8,r9,r10,r11,r12
-; free register :  r14,r15
-; register can be saved : rsp
-
- chainlenwmask   equ  rsp + 8 - LocalVarsSize    ; high word: current chain len
-                                                 ; low word: s->wmask
-;window          equ  rsp + xx - LocalVarsSize   ; local copy of s->window ; stored in r10
-;windowbestlen   equ  rsp + xx - LocalVarsSize   ; s->window + bestlen , use r10+r11
-;scanstart       equ  rsp + xx - LocalVarsSize   ; first two bytes of string ; stored in r12w
-;scanend         equ  rsp + xx - LocalVarsSize   ; last two bytes of string use ebx
-;scanalign       equ  rsp + xx - LocalVarsSize   ; dword-misalignment of string r13
-;bestlen         equ  rsp + xx - LocalVarsSize   ; size of best match so far -> r11d
-;scan            equ  rsp + xx - LocalVarsSize   ; ptr to string wanting match -> r9
-IFDEF INFOZIP
-ELSE
- nicematch       equ  (rsp + 16 - LocalVarsSize) ; a good enough match size
-ENDIF
-
-save_rdi        equ  rsp + 24 - LocalVarsSize
-save_rsi        equ  rsp + 32 - LocalVarsSize
-save_rbx        equ  rsp + 40 - LocalVarsSize
-save_rbp        equ  rsp + 48 - LocalVarsSize
-save_r12        equ  rsp + 56 - LocalVarsSize
-save_r13        equ  rsp + 64 - LocalVarsSize
-;save_r14        equ  rsp + 72 - LocalVarsSize
-;save_r15        equ  rsp + 80 - LocalVarsSize
-
-
-; summary of register usage
-; scanend     ebx
-; scanendw    bx
-; chainlenwmask   edx
-; curmatch    rsi
-; curmatchd   esi
-; windowbestlen   r8
-; scanalign   r9
-; scanalignd  r9d
-; window      r10
-; bestlen     r11
-; bestlend    r11d
-; scanstart   r12d
-; scanstartw  r12w
-; scan        r13
-; nicematch   r14d
-; limit       r15
-; limitd      r15d
-; prev        rcx
-
-;  all the +4 offsets are due to the addition of pending_buf_size (in zlib
-;  in the deflate_state structure since the asm code was first written
-;  (if you compile with zlib 1.0.4 or older, remove the +4).
-;  Note : these value are good with a 8 bytes boundary pack structure
-
-
-    MAX_MATCH           equ     258
-    MIN_MATCH           equ     3
-    MIN_LOOKAHEAD       equ     (MAX_MATCH+MIN_MATCH+1)
-
-
-;;; Offsets for fields in the deflate_state structure. These numbers
-;;; are calculated from the definition of deflate_state, with the
-;;; assumption that the compiler will dword-align the fields. (Thus,
-;;; changing the definition of deflate_state could easily cause this
-;;; program to crash horribly, without so much as a warning at
-;;; compile time. Sigh.)
-
-;  all the +zlib1222add offsets are due to the addition of fields
-;  in zlib in the deflate_state structure since the asm code was first written
-;  (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)").
-;  (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0").
-;  if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8").
-
-
-IFDEF INFOZIP
-
-_DATA   SEGMENT
-COMM    window_size:DWORD
-; WMask ; 7fff
-COMM    window:BYTE:010040H
-COMM    prev:WORD:08000H
-; MatchLen : unused
-; PrevMatch : unused
-COMM    strstart:DWORD
-COMM    match_start:DWORD
-; Lookahead : ignore
-COMM    prev_length:DWORD ; PrevLen
-COMM    max_chain_length:DWORD
-COMM    good_match:DWORD
-COMM    nice_match:DWORD
-prev_ad equ OFFSET prev
-window_ad equ OFFSET window
-nicematch equ nice_match
-_DATA ENDS
-WMask equ 07fffh
-
-ELSE
-
-  IFNDEF zlib1222add
-    zlib1222add equ 8
-  ENDIF
-dsWSize         equ 56+zlib1222add+(zlib1222add/2)
-dsWMask         equ 64+zlib1222add+(zlib1222add/2)
-dsWindow        equ 72+zlib1222add
-dsPrev          equ 88+zlib1222add
-dsMatchLen      equ 128+zlib1222add
-dsPrevMatch     equ 132+zlib1222add
-dsStrStart      equ 140+zlib1222add
-dsMatchStart    equ 144+zlib1222add
-dsLookahead     equ 148+zlib1222add
-dsPrevLen       equ 152+zlib1222add
-dsMaxChainLen   equ 156+zlib1222add
-dsGoodMatch     equ 172+zlib1222add
-dsNiceMatch     equ 176+zlib1222add
-
-window_size     equ [ rcx + dsWSize]
-WMask           equ [ rcx + dsWMask]
-window_ad       equ [ rcx + dsWindow]
-prev_ad         equ [ rcx + dsPrev]
-strstart        equ [ rcx + dsStrStart]
-match_start     equ [ rcx + dsMatchStart]
-Lookahead       equ [ rcx + dsLookahead] ; 0ffffffffh on infozip
-prev_length     equ [ rcx + dsPrevLen]
-max_chain_length equ [ rcx + dsMaxChainLen]
-good_match      equ [ rcx + dsGoodMatch]
-nice_match      equ [ rcx + dsNiceMatch]
-ENDIF
-
-; parameter 1 in r8(deflate state s), param 2 in rdx (cur match)
-
-; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and
-; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp
-;
-; All registers must be preserved across the call, except for
-;   rax, rcx, rdx, r8, r9, r10, and r11, which are scratch.
-
-
-
-;;; Save registers that the compiler may be using, and adjust esp to
-;;; make room for our stack frame.
-
-
-;;; Retrieve the function arguments. r8d will hold cur_match
-;;; throughout the entire function. edx will hold the pointer to the
-;;; deflate_state structure during the function's setup (before
-;;; entering the main loop.
-
-; parameter 1 in rcx (deflate_state* s), param 2 in edx -> r8 (cur match)
-
-; this clear high 32 bits of r8, which can be garbage in both r8 and rdx
-
-        mov [save_rdi],rdi
-        mov [save_rsi],rsi
-        mov [save_rbx],rbx
-        mov [save_rbp],rbp
-IFDEF INFOZIP
-        mov r8d,ecx
-ELSE
-        mov r8d,edx
-ENDIF
-        mov [save_r12],r12
-        mov [save_r13],r13
-;        mov [save_r14],r14
-;        mov [save_r15],r15
-
-
-;;; uInt wmask = s->w_mask;
-;;; unsigned chain_length = s->max_chain_length;
-;;; if (s->prev_length >= s->good_match) {
-;;;     chain_length >>= 2;
-;;; }
-
-        mov edi, prev_length
-        mov esi, good_match
-        mov eax, WMask
-        mov ebx, max_chain_length
-        cmp edi, esi
-        jl  LastMatchGood
-        shr ebx, 2
-LastMatchGood:
-
-;;; chainlen is decremented once beforehand so that the function can
-;;; use the sign flag instead of the zero flag for the exit test.
-;;; It is then shifted into the high word, to make room for the wmask
-;;; value, which it will always accompany.
-
-        dec ebx
-        shl ebx, 16
-        or  ebx, eax
-
-;;; on zlib only
-;;; if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;
-
-IFDEF INFOZIP
-        mov [chainlenwmask], ebx
-; on infozip nice_match = [nice_match]
-ELSE
-        mov eax, nice_match
-        mov [chainlenwmask], ebx
-        mov r10d, Lookahead
-        cmp r10d, eax
-        cmovnl r10d, eax
-        mov [nicematch],r10d
-ENDIF
-
-;;; register Bytef *scan = s->window + s->strstart;
-        mov r10, window_ad
-        mov ebp, strstart
-        lea r13, [r10 + rbp]
-
-;;; Determine how many bytes the scan ptr is off from being
-;;; dword-aligned.
-
-         mov r9,r13
-         neg r13
-         and r13,3
-
-;;; IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
-;;;     s->strstart - (IPos)MAX_DIST(s) : NIL;
-IFDEF INFOZIP
-        mov eax,07efah ; MAX_DIST = (WSIZE-MIN_LOOKAHEAD) (0x8000-(3+8+1))
-ELSE
-        mov eax, window_size
-        sub eax, MIN_LOOKAHEAD
-ENDIF
-        xor edi,edi
-        sub ebp, eax
-
-        mov r11d, prev_length
-
-        cmovng ebp,edi
-
-;;; int best_len = s->prev_length;
-
-
-;;; Store the sum of s->window + best_len in esi locally, and in esi.
-
-       lea  rsi,[r10+r11]
-
-;;; register ush scan_start = *(ushf*)scan;
-;;; register ush scan_end   = *(ushf*)(scan+best_len-1);
-;;; Posf *prev = s->prev;
-
-        movzx r12d,word ptr [r9]
-        movzx ebx, word ptr [r9 + r11 - 1]
-
-        mov rdi, prev_ad
-
-;;; Jump into the main loop.
-
-        mov edx, [chainlenwmask]
-
-        cmp bx,word ptr [rsi + r8 - 1]
-        jz  LookupLoopIsZero
-
-LookupLoop1:
-        and r8d, edx
-
-        movzx   r8d, word ptr [rdi + r8*2]
-        cmp r8d, ebp
-        jbe LeaveNow
-        sub edx, 00010000h
-        js  LeaveNow
-
-LoopEntry1:
-        cmp bx,word ptr [rsi + r8 - 1]
-        jz  LookupLoopIsZero
-
-LookupLoop2:
-        and r8d, edx
-
-        movzx   r8d, word ptr [rdi + r8*2]
-        cmp r8d, ebp
-        jbe LeaveNow
-        sub edx, 00010000h
-        js  LeaveNow
-
-LoopEntry2:
-        cmp bx,word ptr [rsi + r8 - 1]
-        jz  LookupLoopIsZero
-
-LookupLoop4:
-        and r8d, edx
-
-        movzx   r8d, word ptr [rdi + r8*2]
-        cmp r8d, ebp
-        jbe LeaveNow
-        sub edx, 00010000h
-        js  LeaveNow
-
-LoopEntry4:
-
-        cmp bx,word ptr [rsi + r8 - 1]
-        jnz LookupLoop1
-        jmp LookupLoopIsZero
-
-
-;;; do {
-;;;     match = s->window + cur_match;
-;;;     if (*(ushf*)(match+best_len-1) != scan_end ||
-;;;         *(ushf*)match != scan_start) continue;
-;;;     [...]
-;;; } while ((cur_match = prev[cur_match & wmask]) > limit
-;;;          && --chain_length != 0);
-;;;
-;;; Here is the inner loop of the function. The function will spend the
-;;; majority of its time in this loop, and majority of that time will
-;;; be spent in the first ten instructions.
-;;;
-;;; Within this loop:
-;;; ebx = scanend
-;;; r8d = curmatch
-;;; edx = chainlenwmask - i.e., ((chainlen << 16) | wmask)
-;;; esi = windowbestlen - i.e., (window + bestlen)
-;;; edi = prev
-;;; ebp = limit
-
-LookupLoop:
-        and r8d, edx
-
-        movzx   r8d, word ptr [rdi + r8*2]
-        cmp r8d, ebp
-        jbe LeaveNow
-        sub edx, 00010000h
-        js  LeaveNow
-
-LoopEntry:
-
-        cmp bx,word ptr [rsi + r8 - 1]
-        jnz LookupLoop1
-LookupLoopIsZero:
-        cmp     r12w, word ptr [r10 + r8]
-        jnz LookupLoop1
-
-
-;;; Store the current value of chainlen.
-        mov [chainlenwmask], edx
-
-;;; Point edi to the string under scrutiny, and esi to the string we
-;;; are hoping to match it up with. In actuality, esi and edi are
-;;; both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and edx is
-;;; initialized to -(MAX_MATCH_8 - scanalign).
-
-        lea rsi,[r8+r10]
-        mov rdx, 0fffffffffffffef8h; -(MAX_MATCH_8)
-        lea rsi, [rsi + r13 + 0108h] ;MAX_MATCH_8]
-        lea rdi, [r9 + r13 + 0108h] ;MAX_MATCH_8]
-
-        prefetcht1 [rsi+rdx]
-        prefetcht1 [rdi+rdx]
-
-
-;;; Test the strings for equality, 8 bytes at a time. At the end,
-;;; adjust rdx so that it is offset to the exact byte that mismatched.
-;;;
-;;; We already know at this point that the first three bytes of the
-;;; strings match each other, and they can be safely passed over before
-;;; starting the compare loop. So what this code does is skip over 0-3
-;;; bytes, as much as necessary in order to dword-align the edi
-;;; pointer. (rsi will still be misaligned three times out of four.)
-;;;
-;;; It should be confessed that this loop usually does not represent
-;;; much of the total running time. Replacing it with a more
-;;; straightforward "rep cmpsb" would not drastically degrade
-;;; performance.
-
-
-LoopCmps:
-        mov rax, [rsi + rdx]
-        xor rax, [rdi + rdx]
-        jnz LeaveLoopCmps
-
-        mov rax, [rsi + rdx + 8]
-        xor rax, [rdi + rdx + 8]
-        jnz LeaveLoopCmps8
-
-
-        mov rax, [rsi + rdx + 8+8]
-        xor rax, [rdi + rdx + 8+8]
-        jnz LeaveLoopCmps16
-
-        add rdx,8+8+8
-
-        jnz short LoopCmps
-        jmp short LenMaximum
-LeaveLoopCmps16: add rdx,8
-LeaveLoopCmps8: add rdx,8
-LeaveLoopCmps:
-
-        test    eax, 0000FFFFh
-        jnz LenLower
-
-        test eax,0ffffffffh
-
-        jnz LenLower32
-
-        add rdx,4
-        shr rax,32
-        or ax,ax
-        jnz LenLower
-
-LenLower32:
-        shr eax,16
-        add rdx,2
-LenLower:   sub al, 1
-        adc rdx, 0
-;;; Calculate the length of the match. If it is longer than MAX_MATCH,
-;;; then automatically accept it as the best possible match and leave.
-
-        lea rax, [rdi + rdx]
-        sub rax, r9
-        cmp eax, MAX_MATCH
-        jge LenMaximum
-
-;;; If the length of the match is not longer than the best match we
-;;; have so far, then forget it and return to the lookup loop.
-;///////////////////////////////////
-
-        cmp eax, r11d
-        jg  LongerMatch
-
-        lea rsi,[r10+r11]
-
-        mov rdi, prev_ad
-        mov edx, [chainlenwmask]
-        jmp LookupLoop
-
-;;;         s->match_start = cur_match;
-;;;         best_len = len;
-;;;         if (len >= nice_match) break;
-;;;         scan_end = *(ushf*)(scan+best_len-1);
-
-LongerMatch:
-        mov r11d, eax
-        mov match_start, r8d
-        cmp eax, [nicematch]
-        jge LeaveNow
-
-        lea rsi,[r10+rax]
-
-        movzx   ebx, word ptr [r9 + rax - 1]
-        mov rdi, prev_ad
-        mov edx, [chainlenwmask]
-        jmp LookupLoop
-
-;;; Accept the current string, with the maximum possible length.
-
-LenMaximum:
-        mov r11d,MAX_MATCH
-        mov match_start, r8d
-
-;;; if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
-;;; return s->lookahead;
-
-LeaveNow:
-IFDEF INFOZIP
-        mov eax,r11d
-ELSE
-        mov eax, Lookahead
-        cmp r11d, eax
-        cmovng eax, r11d
-ENDIF
-
-;;; Restore the stack and return from whence we came.
-
-
-        mov rsi,[save_rsi]
-        mov rdi,[save_rdi]
-        mov rbx,[save_rbx]
-        mov rbp,[save_rbp]
-        mov r12,[save_r12]
-        mov r13,[save_r13]
-;        mov r14,[save_r14]
-;        mov r15,[save_r15]
-
-
-        ret 0
-; please don't remove this string !
-; Your can freely use gvmat64 in any free or commercial app
-; but it is far better don't remove the string in the binary!
-    db     0dh,0ah,"asm686 with masm, optimised assembly code from Brian Raiter, written 1998, converted to amd 64 by Gilles Vollant 2005",0dh,0ah,0
-longest_match   ENDP
-
-match_init PROC
-  ret 0
-match_init ENDP
-
-
-END
diff --git a/src/png/zlib/contrib/masmx64/inffas8664.c b/src/png/zlib/contrib/masmx64/inffas8664.c
deleted file mode 100644
index aa861a333..000000000
--- a/src/png/zlib/contrib/masmx64/inffas8664.c
+++ /dev/null
@@ -1,186 +0,0 @@
-/* inffas8664.c is a hand tuned assembler version of inffast.c - fast decoding
- * version for AMD64 on Windows using Microsoft C compiler
- *
- * Copyright (C) 1995-2003 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- *
- * Copyright (C) 2003 Chris Anderson <christop@charm.net>
- * Please use the copyright conditions above.
- *
- * 2005 - Adaptation to Microsoft C Compiler for AMD64 by Gilles Vollant
- *
- * inffas8664.c call function inffas8664fnc in inffasx64.asm
- *  inffasx64.asm is automatically convert from AMD64 portion of inffas86.c
- *
- * Dec-29-2003 -- I added AMD64 inflate asm support.  This version is also
- * slightly quicker on x86 systems because, instead of using rep movsb to copy
- * data, it uses rep movsw, which moves data in 2-byte chunks instead of single
- * bytes.  I've tested the AMD64 code on a Fedora Core 1 + the x86_64 updates
- * from http://fedora.linux.duke.edu/fc1_x86_64
- * which is running on an Athlon 64 3000+ / Gigabyte GA-K8VT800M system with
- * 1GB ram.  The 64-bit version is about 4% faster than the 32-bit version,
- * when decompressing mozilla-source-1.3.tar.gz.
- *
- * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
- * the gcc -S output of zlib-1.2.0/inffast.c.  Zlib-1.2.0 is in beta release at
- * the moment.  I have successfully compiled and tested this code with gcc2.96,
- * gcc3.2, icc5.0, msvc6.0.  It is very close to the speed of inffast.S
- * compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX
- * enabled.  I will attempt to merge the MMX code into this version.  Newer
- * versions of this and inffast.S can be found at
- * http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/
- *
- */
-
-#include <stdio.h>
-#include "zutil.h"
-#include "inftrees.h"
-#include "inflate.h"
-#include "inffast.h"
-
-/* Mark Adler's comments from inffast.c: */
-
-/*
-   Decode literal, length, and distance codes and write out the resulting
-   literal and match bytes until either not enough input or output is
-   available, an end-of-block is encountered, or a data error is encountered.
-   When large enough input and output buffers are supplied to inflate(), for
-   example, a 16K input buffer and a 64K output buffer, more than 95% of the
-   inflate execution time is spent in this routine.
-
-   Entry assumptions:
-
-        state->mode == LEN
-        strm->avail_in >= 6
-        strm->avail_out >= 258
-        start >= strm->avail_out
-        state->bits < 8
-
-   On return, state->mode is one of:
-
-        LEN -- ran out of enough output space or enough available input
-        TYPE -- reached end of block code, inflate() to interpret next block
-        BAD -- error in block data
-
-   Notes:
-
-    - The maximum input bits used by a length/distance pair is 15 bits for the
-      length code, 5 bits for the length extra, 15 bits for the distance code,
-      and 13 bits for the distance extra.  This totals 48 bits, or six bytes.
-      Therefore if strm->avail_in >= 6, then there is enough input to avoid
-      checking for available input while decoding.
-
-    - The maximum bytes that a single length/distance pair can output is 258
-      bytes, which is the maximum length that can be coded.  inflate_fast()
-      requires strm->avail_out >= 258 for each loop to avoid checking for
-      output space.
- */
-
-
-
-    typedef struct inffast_ar {
-/* 64   32                               x86  x86_64 */
-/* ar offset                              register */
-/*  0    0 */ void *esp;                /* esp save */
-/*  8    4 */ void *ebp;                /* ebp save */
-/* 16    8 */ unsigned char FAR *in;    /* esi rsi  local strm->next_in */
-/* 24   12 */ unsigned char FAR *last;  /*     r9   while in < last */
-/* 32   16 */ unsigned char FAR *out;   /* edi rdi  local strm->next_out */
-/* 40   20 */ unsigned char FAR *beg;   /*          inflate()'s init next_out */
-/* 48   24 */ unsigned char FAR *end;   /*     r10  while out < end */
-/* 56   28 */ unsigned char FAR *window;/*          size of window, wsize!=0 */
-/* 64   32 */ code const FAR *lcode;    /* ebp rbp  local strm->lencode */
-/* 72   36 */ code const FAR *dcode;    /*     r11  local strm->distcode */
-/* 80   40 */ size_t /*unsigned long */hold;       /* edx rdx  local strm->hold */
-/* 88   44 */ unsigned bits;            /* ebx rbx  local strm->bits */
-/* 92   48 */ unsigned wsize;           /*          window size */
-/* 96   52 */ unsigned write;           /*          window write index */
-/*100   56 */ unsigned lmask;           /*     r12  mask for lcode */
-/*104   60 */ unsigned dmask;           /*     r13  mask for dcode */
-/*108   64 */ unsigned len;             /*     r14  match length */
-/*112   68 */ unsigned dist;            /*     r15  match distance */
-/*116   72 */ unsigned status;          /*          set when state chng*/
-    } type_ar;
-#ifdef ASMINF
-
-void inflate_fast(strm, start)
-z_streamp strm;
-unsigned start;         /* inflate()'s starting value for strm->avail_out */
-{
-    struct inflate_state FAR *state;
-    type_ar ar;
-    void inffas8664fnc(struct inffast_ar * par);
-
-
-
-#if (defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )) || (defined(_MSC_VER) && defined(_M_AMD64))
-#define PAD_AVAIL_IN 6
-#define PAD_AVAIL_OUT 258
-#else
-#define PAD_AVAIL_IN 5
-#define PAD_AVAIL_OUT 257
-#endif
-
-    /* copy state to local variables */
-    state = (struct inflate_state FAR *)strm->state;
-
-    ar.in = strm->next_in;
-    ar.last = ar.in + (strm->avail_in - PAD_AVAIL_IN);
-    ar.out = strm->next_out;
-    ar.beg = ar.out - (start - strm->avail_out);
-    ar.end = ar.out + (strm->avail_out - PAD_AVAIL_OUT);
-    ar.wsize = state->wsize;
-    ar.write = state->wnext;
-    ar.window = state->window;
-    ar.hold = state->hold;
-    ar.bits = state->bits;
-    ar.lcode = state->lencode;
-    ar.dcode = state->distcode;
-    ar.lmask = (1U << state->lenbits) - 1;
-    ar.dmask = (1U << state->distbits) - 1;
-
-    /* decode literals and length/distances until end-of-block or not enough
-       input data or output space */
-
-    /* align in on 1/2 hold size boundary */
-    while (((size_t)(void *)ar.in & (sizeof(ar.hold) / 2 - 1)) != 0) {
-        ar.hold += (unsigned long)*ar.in++ << ar.bits;
-        ar.bits += 8;
-    }
-
-    inffas8664fnc(&ar);
-
-    if (ar.status > 1) {
-        if (ar.status == 2)
-            strm->msg = "invalid literal/length code";
-        else if (ar.status == 3)
-            strm->msg = "invalid distance code";
-        else
-            strm->msg = "invalid distance too far back";
-        state->mode = BAD;
-    }
-    else if ( ar.status == 1 ) {
-        state->mode = TYPE;
-    }
-
-    /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
-    ar.len = ar.bits >> 3;
-    ar.in -= ar.len;
-    ar.bits -= ar.len << 3;
-    ar.hold &= (1U << ar.bits) - 1;
-
-    /* update state and return */
-    strm->next_in = ar.in;
-    strm->next_out = ar.out;
-    strm->avail_in = (unsigned)(ar.in < ar.last ?
-                                PAD_AVAIL_IN + (ar.last - ar.in) :
-                                PAD_AVAIL_IN - (ar.in - ar.last));
-    strm->avail_out = (unsigned)(ar.out < ar.end ?
-                                 PAD_AVAIL_OUT + (ar.end - ar.out) :
-                                 PAD_AVAIL_OUT - (ar.out - ar.end));
-    state->hold = (unsigned long)ar.hold;
-    state->bits = ar.bits;
-    return;
-}
-
-#endif
diff --git a/src/png/zlib/contrib/masmx64/inffasx64.asm b/src/png/zlib/contrib/masmx64/inffasx64.asm
deleted file mode 100644
index 41ec82392..000000000
--- a/src/png/zlib/contrib/masmx64/inffasx64.asm
+++ /dev/null
@@ -1,396 +0,0 @@
-; inffasx64.asm is a hand tuned assembler version of inffast.c - fast decoding
-; version for AMD64 on Windows using Microsoft C compiler
-;
-; inffasx64.asm is automatically convert from AMD64 portion of inffas86.c
-; inffasx64.asm is called by inffas8664.c, which contain more info.
-
-
-; to compile this file, I use option
-;   ml64.exe /Flinffasx64 /c /Zi inffasx64.asm
-;   with Microsoft Macro Assembler (x64) for AMD64
-;
-
-; This file compile with Microsoft Macro Assembler (x64) for AMD64
-;
-;   ml64.exe is given with Visual Studio 2005/2008/2010 and Windows WDK
-;
-;   (you can get Windows WDK with ml64 for AMD64 from
-;      http://www.microsoft.com/whdc/Devtools/wdk/default.mspx for low price)
-;
-
-
-.code
-inffas8664fnc PROC
-
-; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and
-; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp
-;
-; All registers must be preserved across the call, except for
-;   rax, rcx, rdx, r8, r-9, r10, and r11, which are scratch.
-
-
-	mov [rsp-8],rsi
-	mov [rsp-16],rdi
-	mov [rsp-24],r12
-	mov [rsp-32],r13
-	mov [rsp-40],r14
-	mov [rsp-48],r15
-	mov [rsp-56],rbx
-
-	mov rax,rcx
-
-	mov	[rax+8], rbp       ; /* save regs rbp and rsp */
-	mov	[rax], rsp
-
-	mov	rsp, rax          ; /* make rsp point to &ar */
-
-	mov	rsi, [rsp+16]      ; /* rsi  = in */
-	mov	rdi, [rsp+32]      ; /* rdi  = out */
-	mov	r9, [rsp+24]       ; /* r9   = last */
-	mov	r10, [rsp+48]      ; /* r10  = end */
-	mov	rbp, [rsp+64]      ; /* rbp  = lcode */
-	mov	r11, [rsp+72]      ; /* r11  = dcode */
-	mov	rdx, [rsp+80]      ; /* rdx  = hold */
-	mov	ebx, [rsp+88]      ; /* ebx  = bits */
-	mov	r12d, [rsp+100]    ; /* r12d = lmask */
-	mov	r13d, [rsp+104]    ; /* r13d = dmask */
-                                          ; /* r14d = len */
-                                          ; /* r15d = dist */
-
-
-	cld
-	cmp	r10, rdi
-	je	L_one_time           ; /* if only one decode left */
-	cmp	r9, rsi
-
-    jne L_do_loop
-
-
-L_one_time:
-	mov	r8, r12           ; /* r8 = lmask */
-	cmp	bl, 32
-	ja	L_get_length_code_one_time
-
-	lodsd                         ; /* eax = *(uint *)in++ */
-	mov	cl, bl            ; /* cl = bits, needs it for shifting */
-	add	bl, 32             ; /* bits += 32 */
-	shl	rax, cl
-	or	rdx, rax          ; /* hold |= *((uint *)in)++ << bits */
-	jmp	L_get_length_code_one_time
-
-ALIGN 4
-L_while_test:
-	cmp	r10, rdi
-	jbe	L_break_loop
-	cmp	r9, rsi
-	jbe	L_break_loop
-
-L_do_loop:
-	mov	r8, r12           ; /* r8 = lmask */
-	cmp	bl, 32
-	ja	L_get_length_code    ; /* if (32 < bits) */
-
-	lodsd                         ; /* eax = *(uint *)in++ */
-	mov	cl, bl            ; /* cl = bits, needs it for shifting */
-	add	bl, 32             ; /* bits += 32 */
-	shl	rax, cl
-	or	rdx, rax          ; /* hold |= *((uint *)in)++ << bits */
-
-L_get_length_code:
-	and	r8, rdx            ; /* r8 &= hold */
-	mov	eax, [rbp+r8*4]  ; /* eax = lcode[hold & lmask] */
-
-	mov	cl, ah            ; /* cl = this.bits */
-	sub	bl, ah            ; /* bits -= this.bits */
-	shr	rdx, cl           ; /* hold >>= this.bits */
-
-	test	al, al
-	jnz	L_test_for_length_base ; /* if (op != 0) 45.7% */
-
-	mov	r8, r12            ; /* r8 = lmask */
-	shr	eax, 16            ; /* output this.val char */
-	stosb
-
-L_get_length_code_one_time:
-	and	r8, rdx            ; /* r8 &= hold */
-	mov	eax, [rbp+r8*4] ; /* eax = lcode[hold & lmask] */
-
-L_dolen:
-	mov	cl, ah            ; /* cl = this.bits */
-	sub	bl, ah            ; /* bits -= this.bits */
-	shr	rdx, cl           ; /* hold >>= this.bits */
-
-	test	al, al
-	jnz	L_test_for_length_base ; /* if (op != 0) 45.7% */
-
-	shr	eax, 16            ; /* output this.val char */
-	stosb
-	jmp	L_while_test
-
-ALIGN 4
-L_test_for_length_base:
-	mov	r14d, eax         ; /* len = this */
-	shr	r14d, 16           ; /* len = this.val */
-	mov	cl, al
-
-	test	al, 16
-	jz	L_test_for_second_level_length ; /* if ((op & 16) == 0) 8% */
-	and	cl, 15             ; /* op &= 15 */
-	jz	L_decode_distance    ; /* if (!op) */
-
-L_add_bits_to_len:
-	sub	bl, cl
-	xor	eax, eax
-	inc	eax
-	shl	eax, cl
-	dec	eax
-	and	eax, edx          ; /* eax &= hold */
-	shr	rdx, cl
-	add	r14d, eax         ; /* len += hold & mask[op] */
-
-L_decode_distance:
-	mov	r8, r13           ; /* r8 = dmask */
-	cmp	bl, 32
-	ja	L_get_distance_code  ; /* if (32 < bits) */
-
-	lodsd                         ; /* eax = *(uint *)in++ */
-	mov	cl, bl            ; /* cl = bits, needs it for shifting */
-	add	bl, 32             ; /* bits += 32 */
-	shl	rax, cl
-	or	rdx, rax          ; /* hold |= *((uint *)in)++ << bits */
-
-L_get_distance_code:
-	and	r8, rdx           ; /* r8 &= hold */
-	mov	eax, [r11+r8*4] ; /* eax = dcode[hold & dmask] */
-
-L_dodist:
-	mov	r15d, eax         ; /* dist = this */
-	shr	r15d, 16           ; /* dist = this.val */
-	mov	cl, ah
-	sub	bl, ah            ; /* bits -= this.bits */
-	shr	rdx, cl           ; /* hold >>= this.bits */
-	mov	cl, al            ; /* cl = this.op */
-
-	test	al, 16             ; /* if ((op & 16) == 0) */
-	jz	L_test_for_second_level_dist
-	and	cl, 15             ; /* op &= 15 */
-	jz	L_check_dist_one
-
-L_add_bits_to_dist:
-	sub	bl, cl
-	xor	eax, eax
-	inc	eax
-	shl	eax, cl
-	dec	eax                 ; /* (1 << op) - 1 */
-	and	eax, edx          ; /* eax &= hold */
-	shr	rdx, cl
-	add	r15d, eax         ; /* dist += hold & ((1 << op) - 1) */
-
-L_check_window:
-	mov	r8, rsi           ; /* save in so from can use it's reg */
-	mov	rax, rdi
-	sub	rax, [rsp+40]      ; /* nbytes = out - beg */
-
-	cmp	eax, r15d
-	jb	L_clip_window        ; /* if (dist > nbytes) 4.2% */
-
-	mov	ecx, r14d         ; /* ecx = len */
-	mov	rsi, rdi
-	sub	rsi, r15          ; /* from = out - dist */
-
-	sar	ecx, 1
-	jnc	L_copy_two           ; /* if len % 2 == 0 */
-
-	rep     movsw
-	mov	al, [rsi]
-	mov	[rdi], al
-	inc	rdi
-
-	mov	rsi, r8           ; /* move in back to %rsi, toss from */
-	jmp	L_while_test
-
-L_copy_two:
-	rep     movsw
-	mov	rsi, r8           ; /* move in back to %rsi, toss from */
-	jmp	L_while_test
-
-ALIGN 4
-L_check_dist_one:
-	cmp	r15d, 1            ; /* if dist 1, is a memset */
-	jne	L_check_window
-	cmp	[rsp+40], rdi      ; /* if out == beg, outside window */
-	je	L_check_window
-
-	mov	ecx, r14d         ; /* ecx = len */
-	mov	al, [rdi-1]
-	mov	ah, al
-
-	sar	ecx, 1
-	jnc	L_set_two
-	mov	[rdi], al
-	inc	rdi
-
-L_set_two:
-	rep     stosw
-	jmp	L_while_test
-
-ALIGN 4
-L_test_for_second_level_length:
-	test	al, 64
-	jnz	L_test_for_end_of_block ; /* if ((op & 64) != 0) */
-
-	xor	eax, eax
-	inc	eax
-	shl	eax, cl
-	dec	eax
-	and	eax, edx         ; /* eax &= hold */
-	add	eax, r14d        ; /* eax += len */
-	mov	eax, [rbp+rax*4] ; /* eax = lcode[val+(hold&mask[op])]*/
-	jmp	L_dolen
-
-ALIGN 4
-L_test_for_second_level_dist:
-	test	al, 64
-	jnz	L_invalid_distance_code ; /* if ((op & 64) != 0) */
-
-	xor	eax, eax
-	inc	eax
-	shl	eax, cl
-	dec	eax
-	and	eax, edx         ; /* eax &= hold */
-	add	eax, r15d        ; /* eax += dist */
-	mov	eax, [r11+rax*4] ; /* eax = dcode[val+(hold&mask[op])]*/
-	jmp	L_dodist
-
-ALIGN 4
-L_clip_window:
-	mov	ecx, eax         ; /* ecx = nbytes */
-	mov	eax, [rsp+92]     ; /* eax = wsize, prepare for dist cmp */
-	neg	ecx                ; /* nbytes = -nbytes */
-
-	cmp	eax, r15d
-	jb	L_invalid_distance_too_far ; /* if (dist > wsize) */
-
-	add	ecx, r15d         ; /* nbytes = dist - nbytes */
-	cmp	dword ptr [rsp+96], 0
-	jne	L_wrap_around_window ; /* if (write != 0) */
-
-	mov	rsi, [rsp+56]     ; /* from  = window */
-	sub	eax, ecx         ; /* eax  -= nbytes */
-	add	rsi, rax         ; /* from += wsize - nbytes */
-
-	mov	eax, r14d        ; /* eax = len */
-	cmp	r14d, ecx
-	jbe	L_do_copy           ; /* if (nbytes >= len) */
-
-	sub	eax, ecx         ; /* eax -= nbytes */
-	rep     movsb
-	mov	rsi, rdi
-	sub	rsi, r15         ; /* from = &out[ -dist ] */
-	jmp	L_do_copy
-
-ALIGN 4
-L_wrap_around_window:
-	mov	eax, [rsp+96]     ; /* eax = write */
-	cmp	ecx, eax
-	jbe	L_contiguous_in_window ; /* if (write >= nbytes) */
-
-	mov	esi, [rsp+92]     ; /* from  = wsize */
-	add	rsi, [rsp+56]     ; /* from += window */
-	add	rsi, rax         ; /* from += write */
-	sub	rsi, rcx         ; /* from -= nbytes */
-	sub	ecx, eax         ; /* nbytes -= write */
-
-	mov	eax, r14d        ; /* eax = len */
-	cmp	eax, ecx
-	jbe	L_do_copy           ; /* if (nbytes >= len) */
-
-	sub	eax, ecx         ; /* len -= nbytes */
-	rep     movsb
-	mov	rsi, [rsp+56]     ; /* from = window */
-	mov	ecx, [rsp+96]     ; /* nbytes = write */
-	cmp	eax, ecx
-	jbe	L_do_copy           ; /* if (nbytes >= len) */
-
-	sub	eax, ecx         ; /* len -= nbytes */
-	rep     movsb
-	mov	rsi, rdi
-	sub	rsi, r15         ; /* from = out - dist */
-	jmp	L_do_copy
-
-ALIGN 4
-L_contiguous_in_window:
-	mov	rsi, [rsp+56]     ; /* rsi = window */
-	add	rsi, rax
-	sub	rsi, rcx         ; /* from += write - nbytes */
-
-	mov	eax, r14d        ; /* eax = len */
-	cmp	eax, ecx
-	jbe	L_do_copy           ; /* if (nbytes >= len) */
-
-	sub	eax, ecx         ; /* len -= nbytes */
-	rep     movsb
-	mov	rsi, rdi
-	sub	rsi, r15         ; /* from = out - dist */
-	jmp	L_do_copy           ; /* if (nbytes >= len) */
-
-ALIGN 4
-L_do_copy:
-	mov	ecx, eax         ; /* ecx = len */
-	rep     movsb
-
-	mov	rsi, r8          ; /* move in back to %esi, toss from */
-	jmp	L_while_test
-
-L_test_for_end_of_block:
-	test	al, 32
-	jz	L_invalid_literal_length_code
-	mov	dword ptr [rsp+116], 1
-	jmp	L_break_loop_with_status
-
-L_invalid_literal_length_code:
-	mov	dword ptr [rsp+116], 2
-	jmp	L_break_loop_with_status
-
-L_invalid_distance_code:
-	mov	dword ptr [rsp+116], 3
-	jmp	L_break_loop_with_status
-
-L_invalid_distance_too_far:
-	mov	dword ptr [rsp+116], 4
-	jmp	L_break_loop_with_status
-
-L_break_loop:
-	mov	dword ptr [rsp+116], 0
-
-L_break_loop_with_status:
-; /* put in, out, bits, and hold back into ar and pop esp */
-	mov	[rsp+16], rsi     ; /* in */
-	mov	[rsp+32], rdi     ; /* out */
-	mov	[rsp+88], ebx     ; /* bits */
-	mov	[rsp+80], rdx     ; /* hold */
-
-	mov	rax, [rsp]       ; /* restore rbp and rsp */
-	mov	rbp, [rsp+8]
-	mov	rsp, rax
-
-
-
-	mov rsi,[rsp-8]
-	mov rdi,[rsp-16]
-	mov r12,[rsp-24]
-	mov r13,[rsp-32]
-	mov r14,[rsp-40]
-	mov r15,[rsp-48]
-	mov rbx,[rsp-56]
-
-    ret 0
-;          :
-;          : "m" (ar)
-;          : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
-;            "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
-;    );
-
-inffas8664fnc 	ENDP
-;_TEXT	ENDS
-END
diff --git a/src/png/zlib/contrib/masmx64/readme.txt b/src/png/zlib/contrib/masmx64/readme.txt
deleted file mode 100644
index 652571c7a..000000000
--- a/src/png/zlib/contrib/masmx64/readme.txt
+++ /dev/null
@@ -1,31 +0,0 @@
-Summary
--------
-This directory contains ASM implementations of the functions
-longest_match() and inflate_fast(), for 64 bits x86 (both AMD64 and Intel EM64t),
-for use with Microsoft Macro Assembler (x64) for AMD64 and Microsoft C++ 64 bits.
-
-gvmat64.asm is written by Gilles Vollant (2005), by using Brian Raiter 686/32 bits
-   assembly optimized version from Jean-loup Gailly original longest_match function
-
-inffasx64.asm and inffas8664.c were written by Chris Anderson, by optimizing
-   original function from Mark Adler
-
-Use instructions
-----------------
-Assemble the .asm files using MASM and put the object files into the zlib source
-directory.  You can also get object files here:
-
-     http://www.winimage.com/zLibDll/zlib124_masm_obj.zip
-
-define ASMV and ASMINF in your project. Include inffas8664.c in your source tree,
-and inffasx64.obj and gvmat64.obj as object to link.
-
-
-Build instructions
-------------------
-run bld_64.bat with Microsoft Macro Assembler (x64) for AMD64 (ml64.exe)
-
-ml64.exe is given with Visual Studio 2005, Windows 2003 server DDK
-
-You can get Windows 2003 server DDK with ml64 and cl for AMD64 from
-  http://www.microsoft.com/whdc/devtools/ddk/default.mspx for low price)
diff --git a/src/png/zlib/contrib/masmx86/bld_ml32.bat b/src/png/zlib/contrib/masmx86/bld_ml32.bat
deleted file mode 100644
index fcf5755e4..000000000
--- a/src/png/zlib/contrib/masmx86/bld_ml32.bat
+++ /dev/null
@@ -1,2 +0,0 @@
-ml /coff /Zi /c /Flmatch686.lst match686.asm
-ml /coff /Zi /c /Flinffas32.lst inffas32.asm
diff --git a/src/png/zlib/contrib/masmx86/inffas32.asm b/src/png/zlib/contrib/masmx86/inffas32.asm
deleted file mode 100644
index cb37a81e4..000000000
--- a/src/png/zlib/contrib/masmx86/inffas32.asm
+++ /dev/null
@@ -1,1080 +0,0 @@
-;/* inffas32.asm is a hand tuned assembler version of inffast.c -- fast decoding
-; *
-; * inffas32.asm is derivated from inffas86.c, with translation of assembly code
-; *
-; * Copyright (C) 1995-2003 Mark Adler
-; * For conditions of distribution and use, see copyright notice in zlib.h
-; *
-; * Copyright (C) 2003 Chris Anderson <christop@charm.net>
-; * Please use the copyright conditions above.
-; *
-; * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
-; * the gcc -S output of zlib-1.2.0/inffast.c.  Zlib-1.2.0 is in beta release at
-; * the moment.  I have successfully compiled and tested this code with gcc2.96,
-; * gcc3.2, icc5.0, msvc6.0.  It is very close to the speed of inffast.S
-; * compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX
-; * enabled.  I will attempt to merge the MMX code into this version.  Newer
-; * versions of this and inffast.S can be found at
-; * http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/
-; *
-; * 2005 : modification by Gilles Vollant
-; */
-; For Visual C++ 4.x and higher and ML 6.x and higher
-;   ml.exe is in directory \MASM611C of Win95 DDK
-;   ml.exe is also distributed in http://www.masm32.com/masmdl.htm
-;    and in VC++2003 toolkit at http://msdn.microsoft.com/visualc/vctoolkit2003/
-;
-;
-;   compile with command line option
-;   ml  /coff /Zi /c /Flinffas32.lst inffas32.asm
-
-;   if you define NO_GZIP (see inflate.h), compile with
-;   ml  /coff /Zi /c /Flinffas32.lst /DNO_GUNZIP inffas32.asm
-
-
-; zlib122sup is 0 fort zlib 1.2.2.1 and lower
-; zlib122sup is 8 fort zlib 1.2.2.2 and more (with addition of dmax and head
-;        in inflate_state in inflate.h)
-zlib1222sup      equ    8
-
-
-IFDEF GUNZIP
-  INFLATE_MODE_TYPE    equ 11
-  INFLATE_MODE_BAD     equ 26
-ELSE
-  IFNDEF NO_GUNZIP
-    INFLATE_MODE_TYPE    equ 11
-    INFLATE_MODE_BAD     equ 26
-  ELSE
-    INFLATE_MODE_TYPE    equ 3
-    INFLATE_MODE_BAD     equ 17
-  ENDIF
-ENDIF
-
-
-; 75 "inffast.S"
-;FILE "inffast.S"
-
-;;;GLOBAL _inflate_fast
-
-;;;SECTION .text
-
-
-
-	.586p
-	.mmx
-
-	name	inflate_fast_x86
-	.MODEL	FLAT
-
-_DATA			segment
-inflate_fast_use_mmx:
-	dd	1
-
-
-_TEXT			segment
-
-
-
-ALIGN 4
-	db	'Fast decoding Code from Chris Anderson'
-	db	0
-
-ALIGN 4
-invalid_literal_length_code_msg:
-	db	'invalid literal/length code'
-	db	0
-
-ALIGN 4
-invalid_distance_code_msg:
-	db	'invalid distance code'
-	db	0
-
-ALIGN 4
-invalid_distance_too_far_msg:
-	db	'invalid distance too far back'
-	db	0
-
-
-ALIGN 4
-inflate_fast_mask:
-dd	0
-dd	1
-dd	3
-dd	7
-dd	15
-dd	31
-dd	63
-dd	127
-dd	255
-dd	511
-dd	1023
-dd	2047
-dd	4095
-dd	8191
-dd	16383
-dd	32767
-dd	65535
-dd	131071
-dd	262143
-dd	524287
-dd	1048575
-dd	2097151
-dd	4194303
-dd	8388607
-dd	16777215
-dd	33554431
-dd	67108863
-dd	134217727
-dd	268435455
-dd	536870911
-dd	1073741823
-dd	2147483647
-dd	4294967295
-
-
-mode_state	 equ	0	;/* state->mode	*/
-wsize_state	 equ	(32+zlib1222sup)	;/* state->wsize */
-write_state	 equ	(36+4+zlib1222sup)	;/* state->write */
-window_state	 equ	(40+4+zlib1222sup)	;/* state->window */
-hold_state	 equ	(44+4+zlib1222sup)	;/* state->hold	*/
-bits_state	 equ	(48+4+zlib1222sup)	;/* state->bits	*/
-lencode_state	 equ	(64+4+zlib1222sup)	;/* state->lencode */
-distcode_state	 equ	(68+4+zlib1222sup)	;/* state->distcode */
-lenbits_state	 equ	(72+4+zlib1222sup)	;/* state->lenbits */
-distbits_state	 equ	(76+4+zlib1222sup)	;/* state->distbits */
-
-
-;;SECTION .text
-; 205 "inffast.S"
-;GLOBAL	inflate_fast_use_mmx
-
-;SECTION .data
-
-
-; GLOBAL inflate_fast_use_mmx:object
-;.size inflate_fast_use_mmx, 4
-; 226 "inffast.S"
-;SECTION .text
-
-ALIGN 4
-_inflate_fast proc near
-.FPO (16, 4, 0, 0, 1, 0)
-	push  edi
-	push  esi
-	push  ebp
-	push  ebx
-	pushfd
-	sub  esp,64
-	cld
-
-
-
-
-	mov  esi, [esp+88]
-	mov  edi, [esi+28]
-
-
-
-
-
-
-
-	mov  edx, [esi+4]
-	mov  eax, [esi+0]
-
-	add  edx,eax
-	sub  edx,11
-
-	mov  [esp+44],eax
-	mov  [esp+20],edx
-
-	mov  ebp, [esp+92]
-	mov  ecx, [esi+16]
-	mov  ebx, [esi+12]
-
-	sub  ebp,ecx
-	neg  ebp
-	add  ebp,ebx
-
-	sub  ecx,257
-	add  ecx,ebx
-
-	mov  [esp+60],ebx
-	mov  [esp+40],ebp
-	mov  [esp+16],ecx
-; 285 "inffast.S"
-	mov  eax, [edi+lencode_state]
-	mov  ecx, [edi+distcode_state]
-
-	mov  [esp+8],eax
-	mov  [esp+12],ecx
-
-	mov  eax,1
-	mov  ecx, [edi+lenbits_state]
-	shl  eax,cl
-	dec  eax
-	mov  [esp+0],eax
-
-	mov  eax,1
-	mov  ecx, [edi+distbits_state]
-	shl  eax,cl
-	dec  eax
-	mov  [esp+4],eax
-
-	mov  eax, [edi+wsize_state]
-	mov  ecx, [edi+write_state]
-	mov  edx, [edi+window_state]
-
-	mov  [esp+52],eax
-	mov  [esp+48],ecx
-	mov  [esp+56],edx
-
-	mov  ebp, [edi+hold_state]
-	mov  ebx, [edi+bits_state]
-; 321 "inffast.S"
-	mov  esi, [esp+44]
-	mov  ecx, [esp+20]
-	cmp  ecx,esi
-	ja   L_align_long
-
-	add  ecx,11
-	sub  ecx,esi
-	mov  eax,12
-	sub  eax,ecx
-	lea  edi, [esp+28]
-	rep movsb
-	mov  ecx,eax
-	xor  eax,eax
-	rep stosb
-	lea  esi, [esp+28]
-	mov  [esp+20],esi
-	jmp  L_is_aligned
-
-
-L_align_long:
-	test  esi,3
-	jz   L_is_aligned
-	xor  eax,eax
-	mov  al, [esi]
-	inc  esi
-	mov  ecx,ebx
-	add  ebx,8
-	shl  eax,cl
-	or  ebp,eax
-	jmp L_align_long
-
-L_is_aligned:
-	mov  edi, [esp+60]
-; 366 "inffast.S"
-L_check_mmx:
-	cmp  dword ptr [inflate_fast_use_mmx],2
-	je   L_init_mmx
-	ja   L_do_loop
-
-	push  eax
-	push  ebx
-	push  ecx
-	push  edx
-	pushfd
-	mov  eax, [esp]
-	xor  dword ptr [esp],0200000h
-
-
-
-
-	popfd
-	pushfd
-	pop  edx
-	xor  edx,eax
-	jz   L_dont_use_mmx
-	xor  eax,eax
-	cpuid
-	cmp  ebx,0756e6547h
-	jne  L_dont_use_mmx
-	cmp  ecx,06c65746eh
-	jne  L_dont_use_mmx
-	cmp  edx,049656e69h
-	jne  L_dont_use_mmx
-	mov  eax,1
-	cpuid
-	shr  eax,8
-	and  eax,15
-	cmp  eax,6
-	jne  L_dont_use_mmx
-	test  edx,0800000h
-	jnz  L_use_mmx
-	jmp  L_dont_use_mmx
-L_use_mmx:
-	mov  dword ptr [inflate_fast_use_mmx],2
-	jmp  L_check_mmx_pop
-L_dont_use_mmx:
-	mov  dword ptr [inflate_fast_use_mmx],3
-L_check_mmx_pop:
-	pop  edx
-	pop  ecx
-	pop  ebx
-	pop  eax
-	jmp  L_check_mmx
-; 426 "inffast.S"
-ALIGN 4
-L_do_loop:
-; 437 "inffast.S"
-	cmp  bl,15
-	ja   L_get_length_code
-
-	xor  eax,eax
-	lodsw
-	mov  cl,bl
-	add  bl,16
-	shl  eax,cl
-	or  ebp,eax
-
-L_get_length_code:
-	mov  edx, [esp+0]
-	mov  ecx, [esp+8]
-	and  edx,ebp
-	mov  eax, [ecx+edx*4]
-
-L_dolen:
-
-
-
-
-
-
-	mov  cl,ah
-	sub  bl,ah
-	shr  ebp,cl
-
-
-
-
-
-
-	test  al,al
-	jnz   L_test_for_length_base
-
-	shr  eax,16
-	stosb
-
-L_while_test:
-
-
-	cmp  [esp+16],edi
-	jbe  L_break_loop
-
-	cmp  [esp+20],esi
-	ja   L_do_loop
-	jmp  L_break_loop
-
-L_test_for_length_base:
-; 502 "inffast.S"
-	mov  edx,eax
-	shr  edx,16
-	mov  cl,al
-
-	test  al,16
-	jz   L_test_for_second_level_length
-	and  cl,15
-	jz   L_save_len
-	cmp  bl,cl
-	jae  L_add_bits_to_len
-
-	mov  ch,cl
-	xor  eax,eax
-	lodsw
-	mov  cl,bl
-	add  bl,16
-	shl  eax,cl
-	or  ebp,eax
-	mov  cl,ch
-
-L_add_bits_to_len:
-	mov  eax,1
-	shl  eax,cl
-	dec  eax
-	sub  bl,cl
-	and  eax,ebp
-	shr  ebp,cl
-	add  edx,eax
-
-L_save_len:
-	mov  [esp+24],edx
-
-
-L_decode_distance:
-; 549 "inffast.S"
-	cmp  bl,15
-	ja   L_get_distance_code
-
-	xor  eax,eax
-	lodsw
-	mov  cl,bl
-	add  bl,16
-	shl  eax,cl
-	or  ebp,eax
-
-L_get_distance_code:
-	mov  edx, [esp+4]
-	mov  ecx, [esp+12]
-	and  edx,ebp
-	mov  eax, [ecx+edx*4]
-
-
-L_dodist:
-	mov  edx,eax
-	shr  edx,16
-	mov  cl,ah
-	sub  bl,ah
-	shr  ebp,cl
-; 584 "inffast.S"
-	mov  cl,al
-
-	test  al,16
-	jz  L_test_for_second_level_dist
-	and  cl,15
-	jz  L_check_dist_one
-	cmp  bl,cl
-	jae  L_add_bits_to_dist
-
-	mov  ch,cl
-	xor  eax,eax
-	lodsw
-	mov  cl,bl
-	add  bl,16
-	shl  eax,cl
-	or  ebp,eax
-	mov  cl,ch
-
-L_add_bits_to_dist:
-	mov  eax,1
-	shl  eax,cl
-	dec  eax
-	sub  bl,cl
-	and  eax,ebp
-	shr  ebp,cl
-	add  edx,eax
-	jmp  L_check_window
-
-L_check_window:
-; 625 "inffast.S"
-	mov  [esp+44],esi
-	mov  eax,edi
-	sub  eax, [esp+40]
-
-	cmp  eax,edx
-	jb   L_clip_window
-
-	mov  ecx, [esp+24]
-	mov  esi,edi
-	sub  esi,edx
-
-	sub  ecx,3
-	mov  al, [esi]
-	mov  [edi],al
-	mov  al, [esi+1]
-	mov  dl, [esi+2]
-	add  esi,3
-	mov  [edi+1],al
-	mov  [edi+2],dl
-	add  edi,3
-	rep movsb
-
-	mov  esi, [esp+44]
-	jmp  L_while_test
-
-ALIGN 4
-L_check_dist_one:
-	cmp  edx,1
-	jne  L_check_window
-	cmp  [esp+40],edi
-	je  L_check_window
-
-	dec  edi
-	mov  ecx, [esp+24]
-	mov  al, [edi]
-	sub  ecx,3
-
-	mov  [edi+1],al
-	mov  [edi+2],al
-	mov  [edi+3],al
-	add  edi,4
-	rep stosb
-
-	jmp  L_while_test
-
-ALIGN 4
-L_test_for_second_level_length:
-
-
-
-
-	test  al,64
-	jnz   L_test_for_end_of_block
-
-	mov  eax,1
-	shl  eax,cl
-	dec  eax
-	and  eax,ebp
-	add  eax,edx
-	mov  edx, [esp+8]
-	mov  eax, [edx+eax*4]
-	jmp  L_dolen
-
-ALIGN 4
-L_test_for_second_level_dist:
-
-
-
-
-	test  al,64
-	jnz   L_invalid_distance_code
-
-	mov  eax,1
-	shl  eax,cl
-	dec  eax
-	and  eax,ebp
-	add  eax,edx
-	mov  edx, [esp+12]
-	mov  eax, [edx+eax*4]
-	jmp  L_dodist
-
-ALIGN 4
-L_clip_window:
-; 721 "inffast.S"
-	mov  ecx,eax
-	mov  eax, [esp+52]
-	neg  ecx
-	mov  esi, [esp+56]
-
-	cmp  eax,edx
-	jb   L_invalid_distance_too_far
-
-	add  ecx,edx
-	cmp  dword ptr [esp+48],0
-	jne  L_wrap_around_window
-
-	sub  eax,ecx
-	add  esi,eax
-; 749 "inffast.S"
-	mov  eax, [esp+24]
-	cmp  eax,ecx
-	jbe  L_do_copy1
-
-	sub  eax,ecx
-	rep movsb
-	mov  esi,edi
-	sub  esi,edx
-	jmp  L_do_copy1
-
-	cmp  eax,ecx
-	jbe  L_do_copy1
-
-	sub  eax,ecx
-	rep movsb
-	mov  esi,edi
-	sub  esi,edx
-	jmp  L_do_copy1
-
-L_wrap_around_window:
-; 793 "inffast.S"
-	mov  eax, [esp+48]
-	cmp  ecx,eax
-	jbe  L_contiguous_in_window
-
-	add  esi, [esp+52]
-	add  esi,eax
-	sub  esi,ecx
-	sub  ecx,eax
-
-
-	mov  eax, [esp+24]
-	cmp  eax,ecx
-	jbe  L_do_copy1
-
-	sub  eax,ecx
-	rep movsb
-	mov  esi, [esp+56]
-	mov  ecx, [esp+48]
-	cmp  eax,ecx
-	jbe  L_do_copy1
-
-	sub  eax,ecx
-	rep movsb
-	mov  esi,edi
-	sub  esi,edx
-	jmp  L_do_copy1
-
-L_contiguous_in_window:
-; 836 "inffast.S"
-	add  esi,eax
-	sub  esi,ecx
-
-
-	mov  eax, [esp+24]
-	cmp  eax,ecx
-	jbe  L_do_copy1
-
-	sub  eax,ecx
-	rep movsb
-	mov  esi,edi
-	sub  esi,edx
-
-L_do_copy1:
-; 862 "inffast.S"
-	mov  ecx,eax
-	rep movsb
-
-	mov  esi, [esp+44]
-	jmp  L_while_test
-; 878 "inffast.S"
-ALIGN 4
-L_init_mmx:
-	emms
-
-
-
-
-
-	movd mm0,ebp
-	mov  ebp,ebx
-; 896 "inffast.S"
-	movd mm4,dword ptr [esp+0]
-	movq mm3,mm4
-	movd mm5,dword ptr [esp+4]
-	movq mm2,mm5
-	pxor mm1,mm1
-	mov  ebx, [esp+8]
-	jmp  L_do_loop_mmx
-
-ALIGN 4
-L_do_loop_mmx:
-	psrlq mm0,mm1
-
-	cmp  ebp,32
-	ja  L_get_length_code_mmx
-
-	movd mm6,ebp
-	movd mm7,dword ptr [esi]
-	add  esi,4
-	psllq mm7,mm6
-	add  ebp,32
-	por mm0,mm7
-
-L_get_length_code_mmx:
-	pand mm4,mm0
-	movd eax,mm4
-	movq mm4,mm3
-	mov  eax, [ebx+eax*4]
-
-L_dolen_mmx:
-	movzx  ecx,ah
-	movd mm1,ecx
-	sub  ebp,ecx
-
-	test  al,al
-	jnz L_test_for_length_base_mmx
-
-	shr  eax,16
-	stosb
-
-L_while_test_mmx:
-
-
-	cmp  [esp+16],edi
-	jbe L_break_loop
-
-	cmp  [esp+20],esi
-	ja L_do_loop_mmx
-	jmp L_break_loop
-
-L_test_for_length_base_mmx:
-
-	mov  edx,eax
-	shr  edx,16
-
-	test  al,16
-	jz  L_test_for_second_level_length_mmx
-	and  eax,15
-	jz L_decode_distance_mmx
-
-	psrlq mm0,mm1
-	movd mm1,eax
-	movd ecx,mm0
-	sub  ebp,eax
-	and  ecx, [inflate_fast_mask+eax*4]
-	add  edx,ecx
-
-L_decode_distance_mmx:
-	psrlq mm0,mm1
-
-	cmp  ebp,32
-	ja L_get_dist_code_mmx
-
-	movd mm6,ebp
-	movd mm7,dword ptr [esi]
-	add  esi,4
-	psllq mm7,mm6
-	add  ebp,32
-	por mm0,mm7
-
-L_get_dist_code_mmx:
-	mov  ebx, [esp+12]
-	pand mm5,mm0
-	movd eax,mm5
-	movq mm5,mm2
-	mov  eax, [ebx+eax*4]
-
-L_dodist_mmx:
-
-	movzx  ecx,ah
-	mov  ebx,eax
-	shr  ebx,16
-	sub  ebp,ecx
-	movd mm1,ecx
-
-	test  al,16
-	jz L_test_for_second_level_dist_mmx
-	and  eax,15
-	jz L_check_dist_one_mmx
-
-L_add_bits_to_dist_mmx:
-	psrlq mm0,mm1
-	movd mm1,eax
-	movd ecx,mm0
-	sub  ebp,eax
-	and  ecx, [inflate_fast_mask+eax*4]
-	add  ebx,ecx
-
-L_check_window_mmx:
-	mov  [esp+44],esi
-	mov  eax,edi
-	sub  eax, [esp+40]
-
-	cmp  eax,ebx
-	jb L_clip_window_mmx
-
-	mov  ecx,edx
-	mov  esi,edi
-	sub  esi,ebx
-
-	sub  ecx,3
-	mov  al, [esi]
-	mov  [edi],al
-	mov  al, [esi+1]
-	mov  dl, [esi+2]
-	add  esi,3
-	mov  [edi+1],al
-	mov  [edi+2],dl
-	add  edi,3
-	rep movsb
-
-	mov  esi, [esp+44]
-	mov  ebx, [esp+8]
-	jmp  L_while_test_mmx
-
-ALIGN 4
-L_check_dist_one_mmx:
-	cmp  ebx,1
-	jne  L_check_window_mmx
-	cmp  [esp+40],edi
-	je   L_check_window_mmx
-
-	dec  edi
-	mov  ecx,edx
-	mov  al, [edi]
-	sub  ecx,3
-
-	mov  [edi+1],al
-	mov  [edi+2],al
-	mov  [edi+3],al
-	add  edi,4
-	rep stosb
-
-	mov  ebx, [esp+8]
-	jmp  L_while_test_mmx
-
-ALIGN 4
-L_test_for_second_level_length_mmx:
-	test  al,64
-	jnz L_test_for_end_of_block
-
-	and  eax,15
-	psrlq mm0,mm1
-	movd ecx,mm0
-	and  ecx, [inflate_fast_mask+eax*4]
-	add  ecx,edx
-	mov  eax, [ebx+ecx*4]
-	jmp L_dolen_mmx
-
-ALIGN 4
-L_test_for_second_level_dist_mmx:
-	test  al,64
-	jnz L_invalid_distance_code
-
-	and  eax,15
-	psrlq mm0,mm1
-	movd ecx,mm0
-	and  ecx, [inflate_fast_mask+eax*4]
-	mov  eax, [esp+12]
-	add  ecx,ebx
-	mov  eax, [eax+ecx*4]
-	jmp  L_dodist_mmx
-
-ALIGN 4
-L_clip_window_mmx:
-
-	mov  ecx,eax
-	mov  eax, [esp+52]
-	neg  ecx
-	mov  esi, [esp+56]
-
-	cmp  eax,ebx
-	jb  L_invalid_distance_too_far
-
-	add  ecx,ebx
-	cmp  dword ptr [esp+48],0
-	jne  L_wrap_around_window_mmx
-
-	sub  eax,ecx
-	add  esi,eax
-
-	cmp  edx,ecx
-	jbe  L_do_copy1_mmx
-
-	sub  edx,ecx
-	rep movsb
-	mov  esi,edi
-	sub  esi,ebx
-	jmp  L_do_copy1_mmx
-
-	cmp  edx,ecx
-	jbe  L_do_copy1_mmx
-
-	sub  edx,ecx
-	rep movsb
-	mov  esi,edi
-	sub  esi,ebx
-	jmp  L_do_copy1_mmx
-
-L_wrap_around_window_mmx:
-
-	mov  eax, [esp+48]
-	cmp  ecx,eax
-	jbe  L_contiguous_in_window_mmx
-
-	add  esi, [esp+52]
-	add  esi,eax
-	sub  esi,ecx
-	sub  ecx,eax
-
-
-	cmp  edx,ecx
-	jbe  L_do_copy1_mmx
-
-	sub  edx,ecx
-	rep movsb
-	mov  esi, [esp+56]
-	mov  ecx, [esp+48]
-	cmp  edx,ecx
-	jbe  L_do_copy1_mmx
-
-	sub  edx,ecx
-	rep movsb
-	mov  esi,edi
-	sub  esi,ebx
-	jmp  L_do_copy1_mmx
-
-L_contiguous_in_window_mmx:
-
-	add  esi,eax
-	sub  esi,ecx
-
-
-	cmp  edx,ecx
-	jbe  L_do_copy1_mmx
-
-	sub  edx,ecx
-	rep movsb
-	mov  esi,edi
-	sub  esi,ebx
-
-L_do_copy1_mmx:
-
-
-	mov  ecx,edx
-	rep movsb
-
-	mov  esi, [esp+44]
-	mov  ebx, [esp+8]
-	jmp  L_while_test_mmx
-; 1174 "inffast.S"
-L_invalid_distance_code:
-
-
-
-
-
-	mov  ecx, invalid_distance_code_msg
-	mov  edx,INFLATE_MODE_BAD
-	jmp  L_update_stream_state
-
-L_test_for_end_of_block:
-
-
-
-
-
-	test  al,32
-	jz  L_invalid_literal_length_code
-
-	mov  ecx,0
-	mov  edx,INFLATE_MODE_TYPE
-	jmp  L_update_stream_state
-
-L_invalid_literal_length_code:
-
-
-
-
-
-	mov  ecx, invalid_literal_length_code_msg
-	mov  edx,INFLATE_MODE_BAD
-	jmp  L_update_stream_state
-
-L_invalid_distance_too_far:
-
-
-
-	mov  esi, [esp+44]
-	mov  ecx, invalid_distance_too_far_msg
-	mov  edx,INFLATE_MODE_BAD
-	jmp  L_update_stream_state
-
-L_update_stream_state:
-
-	mov  eax, [esp+88]
-	test  ecx,ecx
-	jz  L_skip_msg
-	mov  [eax+24],ecx
-L_skip_msg:
-	mov  eax, [eax+28]
-	mov  [eax+mode_state],edx
-	jmp  L_break_loop
-
-ALIGN 4
-L_break_loop:
-; 1243 "inffast.S"
-	cmp  dword ptr [inflate_fast_use_mmx],2
-	jne  L_update_next_in
-
-
-
-	mov  ebx,ebp
-
-L_update_next_in:
-; 1266 "inffast.S"
-	mov  eax, [esp+88]
-	mov  ecx,ebx
-	mov  edx, [eax+28]
-	shr  ecx,3
-	sub  esi,ecx
-	shl  ecx,3
-	sub  ebx,ecx
-	mov  [eax+12],edi
-	mov  [edx+bits_state],ebx
-	mov  ecx,ebx
-
-	lea  ebx, [esp+28]
-	cmp  [esp+20],ebx
-	jne  L_buf_not_used
-
-	sub  esi,ebx
-	mov  ebx, [eax+0]
-	mov  [esp+20],ebx
-	add  esi,ebx
-	mov  ebx, [eax+4]
-	sub  ebx,11
-	add  [esp+20],ebx
-
-L_buf_not_used:
-	mov  [eax+0],esi
-
-	mov  ebx,1
-	shl  ebx,cl
-	dec  ebx
-
-
-
-
-
-	cmp  dword ptr [inflate_fast_use_mmx],2
-	jne  L_update_hold
-
-
-
-	psrlq mm0,mm1
-	movd ebp,mm0
-
-	emms
-
-L_update_hold:
-
-
-
-	and  ebp,ebx
-	mov  [edx+hold_state],ebp
-
-
-
-
-	mov  ebx, [esp+20]
-	cmp  ebx,esi
-	jbe  L_last_is_smaller
-
-	sub  ebx,esi
-	add  ebx,11
-	mov  [eax+4],ebx
-	jmp  L_fixup_out
-L_last_is_smaller:
-	sub  esi,ebx
-	neg  esi
-	add  esi,11
-	mov  [eax+4],esi
-
-
-
-
-L_fixup_out:
-
-	mov  ebx, [esp+16]
-	cmp  ebx,edi
-	jbe  L_end_is_smaller
-
-	sub  ebx,edi
-	add  ebx,257
-	mov  [eax+16],ebx
-	jmp  L_done
-L_end_is_smaller:
-	sub  edi,ebx
-	neg  edi
-	add  edi,257
-	mov  [eax+16],edi
-
-
-
-
-
-L_done:
-	add  esp,64
-	popfd
-	pop  ebx
-	pop  ebp
-	pop  esi
-	pop  edi
-	ret
-_inflate_fast endp
-
-_TEXT	ends
-end
diff --git a/src/png/zlib/contrib/masmx86/match686.asm b/src/png/zlib/contrib/masmx86/match686.asm
deleted file mode 100644
index 69e0eed01..000000000
--- a/src/png/zlib/contrib/masmx86/match686.asm
+++ /dev/null
@@ -1,479 +0,0 @@
-; match686.asm -- Asm portion of the optimized longest_match for 32 bits x86
-; Copyright (C) 1995-1996 Jean-loup Gailly, Brian Raiter and Gilles Vollant.
-; File written by Gilles Vollant, by converting match686.S from Brian Raiter
-; for MASM. This is as assembly version of longest_match
-;  from Jean-loup Gailly in deflate.c
-;
-;         http://www.zlib.net
-;         http://www.winimage.com/zLibDll
-;         http://www.muppetlabs.com/~breadbox/software/assembly.html
-;
-; For Visual C++ 4.x and higher and ML 6.x and higher
-;   ml.exe is distributed in
-;  http://www.microsoft.com/downloads/details.aspx?FamilyID=7a1c9da0-0510-44a2-b042-7ef370530c64
-;
-; this file contain two implementation of longest_match
-;
-;  this longest_match was written by Brian raiter (1998), optimized for Pentium Pro
-;   (and the faster known version of match_init on modern Core 2 Duo and AMD Phenom)
-;
-;  for using an assembly version of longest_match, you need define ASMV in project
-;
-;    compile the asm file running
-;           ml /coff /Zi /c /Flmatch686.lst match686.asm
-;    and do not include match686.obj in your project
-;
-; note: contrib of zLib 1.2.3 and earlier contained both a deprecated version for
-;  Pentium (prior Pentium Pro) and this version for Pentium Pro and modern processor
-;  with autoselect (with cpu detection code)
-;  if you want support the old pentium optimization, you can still use these version
-;
-; this file is not optimized for old pentium, but it compatible with all x86 32 bits
-; processor (starting 80386)
-;
-;
-; see below : zlib1222add must be adjuster if you use a zlib version < 1.2.2.2
-
-;uInt longest_match(s, cur_match)
-;    deflate_state *s;
-;    IPos cur_match;                             /* current match */
-
-    NbStack         equ     76
-    cur_match       equ     dword ptr[esp+NbStack-0]
-    str_s           equ     dword ptr[esp+NbStack-4]
-; 5 dword on top (ret,ebp,esi,edi,ebx)
-    adrret          equ     dword ptr[esp+NbStack-8]
-    pushebp         equ     dword ptr[esp+NbStack-12]
-    pushedi         equ     dword ptr[esp+NbStack-16]
-    pushesi         equ     dword ptr[esp+NbStack-20]
-    pushebx         equ     dword ptr[esp+NbStack-24]
-
-    chain_length    equ     dword ptr [esp+NbStack-28]
-    limit           equ     dword ptr [esp+NbStack-32]
-    best_len        equ     dword ptr [esp+NbStack-36]
-    window          equ     dword ptr [esp+NbStack-40]
-    prev            equ     dword ptr [esp+NbStack-44]
-    scan_start      equ      word ptr [esp+NbStack-48]
-    wmask           equ     dword ptr [esp+NbStack-52]
-    match_start_ptr equ     dword ptr [esp+NbStack-56]
-    nice_match      equ     dword ptr [esp+NbStack-60]
-    scan            equ     dword ptr [esp+NbStack-64]
-
-    windowlen       equ     dword ptr [esp+NbStack-68]
-    match_start     equ     dword ptr [esp+NbStack-72]
-    strend          equ     dword ptr [esp+NbStack-76]
-    NbStackAdd      equ     (NbStack-24)
-
-    .386p
-
-    name    gvmatch
-    .MODEL  FLAT
-
-
-
-;  all the +zlib1222add offsets are due to the addition of fields
-;  in zlib in the deflate_state structure since the asm code was first written
-;  (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)").
-;  (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0").
-;  if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8").
-
-    zlib1222add         equ     8
-
-;  Note : these value are good with a 8 bytes boundary pack structure
-    dep_chain_length    equ     74h+zlib1222add
-    dep_window          equ     30h+zlib1222add
-    dep_strstart        equ     64h+zlib1222add
-    dep_prev_length     equ     70h+zlib1222add
-    dep_nice_match      equ     88h+zlib1222add
-    dep_w_size          equ     24h+zlib1222add
-    dep_prev            equ     38h+zlib1222add
-    dep_w_mask          equ     2ch+zlib1222add
-    dep_good_match      equ     84h+zlib1222add
-    dep_match_start     equ     68h+zlib1222add
-    dep_lookahead       equ     6ch+zlib1222add
-
-
-_TEXT                   segment
-
-IFDEF NOUNDERLINE
-            public  longest_match
-            public  match_init
-ELSE
-            public  _longest_match
-            public  _match_init
-ENDIF
-
-    MAX_MATCH           equ     258
-    MIN_MATCH           equ     3
-    MIN_LOOKAHEAD       equ     (MAX_MATCH+MIN_MATCH+1)
-
-
-
-MAX_MATCH       equ     258
-MIN_MATCH       equ     3
-MIN_LOOKAHEAD   equ     (MAX_MATCH + MIN_MATCH + 1)
-MAX_MATCH_8_     equ     ((MAX_MATCH + 7) AND 0FFF0h)
-
-
-;;; stack frame offsets
-
-chainlenwmask   equ  esp + 0    ; high word: current chain len
-                    ; low word: s->wmask
-window      equ  esp + 4    ; local copy of s->window
-windowbestlen   equ  esp + 8    ; s->window + bestlen
-scanstart   equ  esp + 16   ; first two bytes of string
-scanend     equ  esp + 12   ; last two bytes of string
-scanalign   equ  esp + 20   ; dword-misalignment of string
-nicematch   equ  esp + 24   ; a good enough match size
-bestlen     equ  esp + 28   ; size of best match so far
-scan        equ  esp + 32   ; ptr to string wanting match
-
-LocalVarsSize   equ 36
-;   saved ebx   byte esp + 36
-;   saved edi   byte esp + 40
-;   saved esi   byte esp + 44
-;   saved ebp   byte esp + 48
-;   return address  byte esp + 52
-deflatestate    equ  esp + 56   ; the function arguments
-curmatch    equ  esp + 60
-
-;;; Offsets for fields in the deflate_state structure. These numbers
-;;; are calculated from the definition of deflate_state, with the
-;;; assumption that the compiler will dword-align the fields. (Thus,
-;;; changing the definition of deflate_state could easily cause this
-;;; program to crash horribly, without so much as a warning at
-;;; compile time. Sigh.)
-
-dsWSize     equ 36+zlib1222add
-dsWMask     equ 44+zlib1222add
-dsWindow    equ 48+zlib1222add
-dsPrev      equ 56+zlib1222add
-dsMatchLen  equ 88+zlib1222add
-dsPrevMatch equ 92+zlib1222add
-dsStrStart  equ 100+zlib1222add
-dsMatchStart    equ 104+zlib1222add
-dsLookahead equ 108+zlib1222add
-dsPrevLen   equ 112+zlib1222add
-dsMaxChainLen   equ 116+zlib1222add
-dsGoodMatch equ 132+zlib1222add
-dsNiceMatch equ 136+zlib1222add
-
-
-;;; match686.asm -- Pentium-Pro-optimized version of longest_match()
-;;; Written for zlib 1.1.2
-;;; Copyright (C) 1998 Brian Raiter <breadbox@muppetlabs.com>
-;;; You can look at http://www.muppetlabs.com/~breadbox/software/assembly.html
-;;;
-;;
-;;  This software is provided 'as-is', without any express or implied
-;;  warranty.  In no event will the authors be held liable for any damages
-;;  arising from the use of this software.
-;;
-;;  Permission is granted to anyone to use this software for any purpose,
-;;  including commercial applications, and to alter it and redistribute it
-;;  freely, subject to the following restrictions:
-;;
-;;  1. The origin of this software must not be misrepresented; you must not
-;;     claim that you wrote the original software. If you use this software
-;;     in a product, an acknowledgment in the product documentation would be
-;;     appreciated but is not required.
-;;  2. Altered source versions must be plainly marked as such, and must not be
-;;     misrepresented as being the original software
-;;  3. This notice may not be removed or altered from any source distribution.
-;;
-
-;GLOBAL _longest_match, _match_init
-
-
-;SECTION    .text
-
-;;; uInt longest_match(deflate_state *deflatestate, IPos curmatch)
-
-;_longest_match:
-    IFDEF NOUNDERLINE
-    longest_match       proc near
-    ELSE
-    _longest_match      proc near
-    ENDIF
-.FPO (9, 4, 0, 0, 1, 0)
-
-;;; Save registers that the compiler may be using, and adjust esp to
-;;; make room for our stack frame.
-
-        push    ebp
-        push    edi
-        push    esi
-        push    ebx
-        sub esp, LocalVarsSize
-
-;;; Retrieve the function arguments. ecx will hold cur_match
-;;; throughout the entire function. edx will hold the pointer to the
-;;; deflate_state structure during the function's setup (before
-;;; entering the main loop.
-
-        mov edx, [deflatestate]
-        mov ecx, [curmatch]
-
-;;; uInt wmask = s->w_mask;
-;;; unsigned chain_length = s->max_chain_length;
-;;; if (s->prev_length >= s->good_match) {
-;;;     chain_length >>= 2;
-;;; }
-
-        mov eax, [edx + dsPrevLen]
-        mov ebx, [edx + dsGoodMatch]
-        cmp eax, ebx
-        mov eax, [edx + dsWMask]
-        mov ebx, [edx + dsMaxChainLen]
-        jl  LastMatchGood
-        shr ebx, 2
-LastMatchGood:
-
-;;; chainlen is decremented once beforehand so that the function can
-;;; use the sign flag instead of the zero flag for the exit test.
-;;; It is then shifted into the high word, to make room for the wmask
-;;; value, which it will always accompany.
-
-        dec ebx
-        shl ebx, 16
-        or  ebx, eax
-        mov [chainlenwmask], ebx
-
-;;; if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;
-
-        mov eax, [edx + dsNiceMatch]
-        mov ebx, [edx + dsLookahead]
-        cmp ebx, eax
-        jl  LookaheadLess
-        mov ebx, eax
-LookaheadLess:  mov [nicematch], ebx
-
-;;; register Bytef *scan = s->window + s->strstart;
-
-        mov esi, [edx + dsWindow]
-        mov [window], esi
-        mov ebp, [edx + dsStrStart]
-        lea edi, [esi + ebp]
-        mov [scan], edi
-
-;;; Determine how many bytes the scan ptr is off from being
-;;; dword-aligned.
-
-        mov eax, edi
-        neg eax
-        and eax, 3
-        mov [scanalign], eax
-
-;;; IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
-;;;     s->strstart - (IPos)MAX_DIST(s) : NIL;
-
-        mov eax, [edx + dsWSize]
-        sub eax, MIN_LOOKAHEAD
-        sub ebp, eax
-        jg  LimitPositive
-        xor ebp, ebp
-LimitPositive:
-
-;;; int best_len = s->prev_length;
-
-        mov eax, [edx + dsPrevLen]
-        mov [bestlen], eax
-
-;;; Store the sum of s->window + best_len in esi locally, and in esi.
-
-        add esi, eax
-        mov [windowbestlen], esi
-
-;;; register ush scan_start = *(ushf*)scan;
-;;; register ush scan_end   = *(ushf*)(scan+best_len-1);
-;;; Posf *prev = s->prev;
-
-        movzx   ebx, word ptr [edi]
-        mov [scanstart], ebx
-        movzx   ebx, word ptr [edi + eax - 1]
-        mov [scanend], ebx
-        mov edi, [edx + dsPrev]
-
-;;; Jump into the main loop.
-
-        mov edx, [chainlenwmask]
-        jmp short LoopEntry
-
-align 4
-
-;;; do {
-;;;     match = s->window + cur_match;
-;;;     if (*(ushf*)(match+best_len-1) != scan_end ||
-;;;         *(ushf*)match != scan_start) continue;
-;;;     [...]
-;;; } while ((cur_match = prev[cur_match & wmask]) > limit
-;;;          && --chain_length != 0);
-;;;
-;;; Here is the inner loop of the function. The function will spend the
-;;; majority of its time in this loop, and majority of that time will
-;;; be spent in the first ten instructions.
-;;;
-;;; Within this loop:
-;;; ebx = scanend
-;;; ecx = curmatch
-;;; edx = chainlenwmask - i.e., ((chainlen << 16) | wmask)
-;;; esi = windowbestlen - i.e., (window + bestlen)
-;;; edi = prev
-;;; ebp = limit
-
-LookupLoop:
-        and ecx, edx
-        movzx   ecx, word ptr [edi + ecx*2]
-        cmp ecx, ebp
-        jbe LeaveNow
-        sub edx, 00010000h
-        js  LeaveNow
-LoopEntry:  movzx   eax, word ptr [esi + ecx - 1]
-        cmp eax, ebx
-        jnz LookupLoop
-        mov eax, [window]
-        movzx   eax, word ptr [eax + ecx]
-        cmp eax, [scanstart]
-        jnz LookupLoop
-
-;;; Store the current value of chainlen.
-
-        mov [chainlenwmask], edx
-
-;;; Point edi to the string under scrutiny, and esi to the string we
-;;; are hoping to match it up with. In actuality, esi and edi are
-;;; both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and edx is
-;;; initialized to -(MAX_MATCH_8 - scanalign).
-
-        mov esi, [window]
-        mov edi, [scan]
-        add esi, ecx
-        mov eax, [scanalign]
-        mov edx, 0fffffef8h; -(MAX_MATCH_8)
-        lea edi, [edi + eax + 0108h] ;MAX_MATCH_8]
-        lea esi, [esi + eax + 0108h] ;MAX_MATCH_8]
-
-;;; Test the strings for equality, 8 bytes at a time. At the end,
-;;; adjust edx so that it is offset to the exact byte that mismatched.
-;;;
-;;; We already know at this point that the first three bytes of the
-;;; strings match each other, and they can be safely passed over before
-;;; starting the compare loop. So what this code does is skip over 0-3
-;;; bytes, as much as necessary in order to dword-align the edi
-;;; pointer. (esi will still be misaligned three times out of four.)
-;;;
-;;; It should be confessed that this loop usually does not represent
-;;; much of the total running time. Replacing it with a more
-;;; straightforward "rep cmpsb" would not drastically degrade
-;;; performance.
-
-LoopCmps:
-        mov eax, [esi + edx]
-        xor eax, [edi + edx]
-        jnz LeaveLoopCmps
-        mov eax, [esi + edx + 4]
-        xor eax, [edi + edx + 4]
-        jnz LeaveLoopCmps4
-        add edx, 8
-        jnz LoopCmps
-        jmp short LenMaximum
-LeaveLoopCmps4: add edx, 4
-LeaveLoopCmps:  test    eax, 0000FFFFh
-        jnz LenLower
-        add edx,  2
-        shr eax, 16
-LenLower:   sub al, 1
-        adc edx, 0
-
-;;; Calculate the length of the match. If it is longer than MAX_MATCH,
-;;; then automatically accept it as the best possible match and leave.
-
-        lea eax, [edi + edx]
-        mov edi, [scan]
-        sub eax, edi
-        cmp eax, MAX_MATCH
-        jge LenMaximum
-
-;;; If the length of the match is not longer than the best match we
-;;; have so far, then forget it and return to the lookup loop.
-
-        mov edx, [deflatestate]
-        mov ebx, [bestlen]
-        cmp eax, ebx
-        jg  LongerMatch
-        mov esi, [windowbestlen]
-        mov edi, [edx + dsPrev]
-        mov ebx, [scanend]
-        mov edx, [chainlenwmask]
-        jmp LookupLoop
-
-;;;         s->match_start = cur_match;
-;;;         best_len = len;
-;;;         if (len >= nice_match) break;
-;;;         scan_end = *(ushf*)(scan+best_len-1);
-
-LongerMatch:    mov ebx, [nicematch]
-        mov [bestlen], eax
-        mov [edx + dsMatchStart], ecx
-        cmp eax, ebx
-        jge LeaveNow
-        mov esi, [window]
-        add esi, eax
-        mov [windowbestlen], esi
-        movzx   ebx, word ptr [edi + eax - 1]
-        mov edi, [edx + dsPrev]
-        mov [scanend], ebx
-        mov edx, [chainlenwmask]
-        jmp LookupLoop
-
-;;; Accept the current string, with the maximum possible length.
-
-LenMaximum: mov edx, [deflatestate]
-        mov dword ptr [bestlen], MAX_MATCH
-        mov [edx + dsMatchStart], ecx
-
-;;; if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
-;;; return s->lookahead;
-
-LeaveNow:
-        mov edx, [deflatestate]
-        mov ebx, [bestlen]
-        mov eax, [edx + dsLookahead]
-        cmp ebx, eax
-        jg  LookaheadRet
-        mov eax, ebx
-LookaheadRet:
-
-;;; Restore the stack and return from whence we came.
-
-        add esp, LocalVarsSize
-        pop ebx
-        pop esi
-        pop edi
-        pop ebp
-
-        ret
-; please don't remove this string !
-; Your can freely use match686 in any free or commercial app if you don't remove the string in the binary!
-    db     0dh,0ah,"asm686 with masm, optimised assembly code from Brian Raiter, written 1998",0dh,0ah
-
-
-    IFDEF NOUNDERLINE
-    longest_match       endp
-    ELSE
-    _longest_match      endp
-    ENDIF
-
-    IFDEF NOUNDERLINE
-    match_init      proc near
-                    ret
-    match_init      endp
-    ELSE
-    _match_init     proc near
-                    ret
-    _match_init     endp
-    ENDIF
-
-
-_TEXT   ends
-end
diff --git a/src/png/zlib/contrib/masmx86/readme.txt b/src/png/zlib/contrib/masmx86/readme.txt
deleted file mode 100644
index 3f8888679..000000000
--- a/src/png/zlib/contrib/masmx86/readme.txt
+++ /dev/null
@@ -1,27 +0,0 @@
-
-Summary
--------
-This directory contains ASM implementations of the functions
-longest_match() and inflate_fast().
-
-
-Use instructions
-----------------
-Assemble using MASM, and copy the object files into the zlib source
-directory, then run the appropriate makefile, as suggested below.  You can
-donwload MASM from here:
-
-    http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=7a1c9da0-0510-44a2-b042-7ef370530c64
-
-You can also get objects files here:
-
-    http://www.winimage.com/zLibDll/zlib124_masm_obj.zip
-
-Build instructions
-------------------
-* With Microsoft C and MASM:
-nmake -f win32/Makefile.msc LOC="-DASMV -DASMINF" OBJA="match686.obj inffas32.obj"
-
-* With Borland C and TASM:
-make -f win32/Makefile.bor LOCAL_ZLIB="-DASMV -DASMINF" OBJA="match686.obj inffas32.obj" OBJPA="+match686c.obj+match686.obj+inffas32.obj"
-
diff --git a/src/png/zlib/contrib/minizip/Makefile b/src/png/zlib/contrib/minizip/Makefile
deleted file mode 100644
index 84eaad20d..000000000
--- a/src/png/zlib/contrib/minizip/Makefile
+++ /dev/null
@@ -1,25 +0,0 @@
-CC=cc
-CFLAGS=-O -I../..
-
-UNZ_OBJS = miniunz.o unzip.o ioapi.o ../../libz.a
-ZIP_OBJS = minizip.o zip.o   ioapi.o ../../libz.a
-
-.c.o:
-	$(CC) -c $(CFLAGS) $*.c
-
-all: miniunz minizip
-
-miniunz:  $(UNZ_OBJS)
-	$(CC) $(CFLAGS) -o $@ $(UNZ_OBJS)
-
-minizip:  $(ZIP_OBJS)
-	$(CC) $(CFLAGS) -o $@ $(ZIP_OBJS)
-
-test:	miniunz minizip
-	./minizip test readme.txt
-	./miniunz -l test.zip
-	mv readme.txt readme.old
-	./miniunz test.zip
-
-clean:
-	/bin/rm -f *.o *~ minizip miniunz
diff --git a/src/png/zlib/contrib/minizip/Makefile.am b/src/png/zlib/contrib/minizip/Makefile.am
deleted file mode 100644
index d343011eb..000000000
--- a/src/png/zlib/contrib/minizip/Makefile.am
+++ /dev/null
@@ -1,45 +0,0 @@
-lib_LTLIBRARIES = libminizip.la
-
-if COND_DEMOS
-bin_PROGRAMS = miniunzip minizip
-endif
-
-zlib_top_srcdir = $(top_srcdir)/../..
-zlib_top_builddir = $(top_builddir)/../..
-
-AM_CPPFLAGS = -I$(zlib_top_srcdir)
-AM_LDFLAGS = -L$(zlib_top_builddir)
-
-if WIN32
-iowin32_src = iowin32.c
-iowin32_h = iowin32.h
-endif
-
-libminizip_la_SOURCES = \
-	ioapi.c \
-	mztools.c \
-	unzip.c \
-	zip.c \
-	${iowin32_src}
-
-libminizip_la_LDFLAGS = $(AM_LDFLAGS) -version-info 1:0:0 -lz
-
-minizip_includedir = $(includedir)/minizip
-minizip_include_HEADERS = \
-	crypt.h \
-	ioapi.h \
-	mztools.h \
-	unzip.h \
-	zip.h \
-	${iowin32_h}
-
-pkgconfigdir = $(libdir)/pkgconfig
-pkgconfig_DATA = minizip.pc
-
-EXTRA_PROGRAMS = miniunzip minizip
-
-miniunzip_SOURCES = miniunz.c
-miniunzip_LDADD = libminizip.la
-
-minizip_SOURCES = minizip.c
-minizip_LDADD = libminizip.la -lz
diff --git a/src/png/zlib/contrib/minizip/MiniZip64_Changes.txt b/src/png/zlib/contrib/minizip/MiniZip64_Changes.txt
deleted file mode 100644
index 13a1bd91a..000000000
--- a/src/png/zlib/contrib/minizip/MiniZip64_Changes.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-
-MiniZip 1.1 was derrived from MiniZip at version 1.01f
-
-Change in 1.0 (Okt 2009)
- - **TODO - Add history**
-
diff --git a/src/png/zlib/contrib/minizip/MiniZip64_info.txt b/src/png/zlib/contrib/minizip/MiniZip64_info.txt
deleted file mode 100644
index 57d715242..000000000
--- a/src/png/zlib/contrib/minizip/MiniZip64_info.txt
+++ /dev/null
@@ -1,74 +0,0 @@
-MiniZip - Copyright (c) 1998-2010 - by Gilles Vollant - version 1.1 64 bits from Mathias Svensson
-
-Introduction
----------------------
-MiniZip 1.1 is built from MiniZip 1.0 by Gilles Vollant ( http://www.winimage.com/zLibDll/minizip.html )
-
-When adding ZIP64 support into minizip it would result into risk of breaking compatibility with minizip 1.0.
-All possible work was done for compatibility.
-
-
-Background
----------------------
-When adding ZIP64 support Mathias Svensson found that Even Rouault have added ZIP64 
-support for unzip.c into minizip for a open source project called gdal ( http://www.gdal.org/ )
-
-That was used as a starting point. And after that ZIP64 support was added to zip.c
-some refactoring and code cleanup was also done.
-
-
-Changed from MiniZip 1.0 to MiniZip 1.1
----------------------------------------
-* Added ZIP64 support for unzip ( by Even Rouault )
-* Added ZIP64 support for zip ( by Mathias Svensson )
-* Reverted some changed that Even Rouault did.
-* Bunch of patches received from Gulles Vollant that he received for MiniZip from various users.
-* Added unzip patch for BZIP Compression method (patch create by Daniel Borca)
-* Added BZIP Compress method for zip
-* Did some refactoring and code cleanup
-
-
-Credits
-
- Gilles Vollant    - Original MiniZip author
- Even Rouault      - ZIP64 unzip Support
- Daniel Borca      - BZip Compression method support in unzip
- Mathias Svensson  - ZIP64 zip support
- Mathias Svensson  - BZip Compression method support in zip
-
- Resources
-
- ZipLayout   http://result42.com/projects/ZipFileLayout
-             Command line tool for Windows that shows the layout and information of the headers in a zip archive.
-             Used when debugging and validating the creation of zip files using MiniZip64
-
-
- ZIP App Note  http://www.pkware.com/documents/casestudies/APPNOTE.TXT
-               Zip File specification
-
-
-Notes.
- * To be able to use BZip compression method in zip64.c or unzip64.c the BZIP2 lib is needed and HAVE_BZIP2 need to be defined.
-
-License
-----------------------------------------------------------
-   Condition of use and distribution are the same than zlib :
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the authors be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-
-----------------------------------------------------------
-
diff --git a/src/png/zlib/contrib/minizip/configure.ac b/src/png/zlib/contrib/minizip/configure.ac
deleted file mode 100644
index 5b1197097..000000000
--- a/src/png/zlib/contrib/minizip/configure.ac
+++ /dev/null
@@ -1,32 +0,0 @@
-#                                               -*- Autoconf -*-
-# Process this file with autoconf to produce a configure script.
-
-AC_INIT([minizip], [1.2.11], [bugzilla.redhat.com])
-AC_CONFIG_SRCDIR([minizip.c])
-AM_INIT_AUTOMAKE([foreign])
-LT_INIT
-
-AC_MSG_CHECKING([whether to build example programs])
-AC_ARG_ENABLE([demos], AC_HELP_STRING([--enable-demos], [build example programs]))
-AM_CONDITIONAL([COND_DEMOS], [test "$enable_demos" = yes])
-if test "$enable_demos" = yes
-then
-	AC_MSG_RESULT([yes])
-else
-	AC_MSG_RESULT([no])
-fi
-
-case "${host}" in
-	*-mingw* | mingw*)
-		WIN32="yes"
-		;;
-	*)
-		;;
-esac
-AM_CONDITIONAL([WIN32], [test "${WIN32}" = "yes"])
-
-
-AC_SUBST([HAVE_UNISTD_H], [0])
-AC_CHECK_HEADER([unistd.h], [HAVE_UNISTD_H=1], [])
-AC_CONFIG_FILES([Makefile minizip.pc])
-AC_OUTPUT
diff --git a/src/png/zlib/contrib/minizip/crypt.h b/src/png/zlib/contrib/minizip/crypt.h
deleted file mode 100644
index 1e9e8200b..000000000
--- a/src/png/zlib/contrib/minizip/crypt.h
+++ /dev/null
@@ -1,131 +0,0 @@
-/* crypt.h -- base code for crypt/uncrypt ZIPfile
-
-
-   Version 1.01e, February 12th, 2005
-
-   Copyright (C) 1998-2005 Gilles Vollant
-
-   This code is a modified version of crypting code in Infozip distribution
-
-   The encryption/decryption parts of this source code (as opposed to the
-   non-echoing password parts) were originally written in Europe.  The
-   whole source package can be freely distributed, including from the USA.
-   (Prior to January 2000, re-export from the US was a violation of US law.)
-
-   This encryption code is a direct transcription of the algorithm from
-   Roger Schlafly, described by Phil Katz in the file appnote.txt.  This
-   file (appnote.txt) is distributed with the PKZIP program (even in the
-   version without encryption capabilities).
-
-   If you don't need crypting in your application, just define symbols
-   NOCRYPT and NOUNCRYPT.
-
-   This code support the "Traditional PKWARE Encryption".
-
-   The new AES encryption added on Zip format by Winzip (see the page
-   http://www.winzip.com/aes_info.htm ) and PKWare PKZip 5.x Strong
-   Encryption is not supported.
-*/
-
-#define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8))
-
-/***********************************************************************
- * Return the next byte in the pseudo-random sequence
- */
-static int decrypt_byte(unsigned long* pkeys, const z_crc_t* pcrc_32_tab)
-{
-    unsigned temp;  /* POTENTIAL BUG:  temp*(temp^1) may overflow in an
-                     * unpredictable manner on 16-bit systems; not a problem
-                     * with any known compiler so far, though */
-
-    temp = ((unsigned)(*(pkeys+2)) & 0xffff) | 2;
-    return (int)(((temp * (temp ^ 1)) >> 8) & 0xff);
-}
-
-/***********************************************************************
- * Update the encryption keys with the next byte of plain text
- */
-static int update_keys(unsigned long* pkeys,const z_crc_t* pcrc_32_tab,int c)
-{
-    (*(pkeys+0)) = CRC32((*(pkeys+0)), c);
-    (*(pkeys+1)) += (*(pkeys+0)) & 0xff;
-    (*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1;
-    {
-      register int keyshift = (int)((*(pkeys+1)) >> 24);
-      (*(pkeys+2)) = CRC32((*(pkeys+2)), keyshift);
-    }
-    return c;
-}
-
-
-/***********************************************************************
- * Initialize the encryption keys and the random header according to
- * the given password.
- */
-static void init_keys(const char* passwd,unsigned long* pkeys,const z_crc_t* pcrc_32_tab)
-{
-    *(pkeys+0) = 305419896L;
-    *(pkeys+1) = 591751049L;
-    *(pkeys+2) = 878082192L;
-    while (*passwd != '\0') {
-        update_keys(pkeys,pcrc_32_tab,(int)*passwd);
-        passwd++;
-    }
-}
-
-#define zdecode(pkeys,pcrc_32_tab,c) \
-    (update_keys(pkeys,pcrc_32_tab,c ^= decrypt_byte(pkeys,pcrc_32_tab)))
-
-#define zencode(pkeys,pcrc_32_tab,c,t) \
-    (t=decrypt_byte(pkeys,pcrc_32_tab), update_keys(pkeys,pcrc_32_tab,c), t^(c))
-
-#ifdef INCLUDECRYPTINGCODE_IFCRYPTALLOWED
-
-#define RAND_HEAD_LEN  12
-   /* "last resort" source for second part of crypt seed pattern */
-#  ifndef ZCR_SEED2
-#    define ZCR_SEED2 3141592654UL     /* use PI as default pattern */
-#  endif
-
-static int crypthead(const char* passwd,      /* password string */
-                     unsigned char* buf,      /* where to write header */
-                     int bufSize,
-                     unsigned long* pkeys,
-                     const z_crc_t* pcrc_32_tab,
-                     unsigned long crcForCrypting)
-{
-    int n;                       /* index in random header */
-    int t;                       /* temporary */
-    int c;                       /* random byte */
-    unsigned char header[RAND_HEAD_LEN-2]; /* random header */
-    static unsigned calls = 0;   /* ensure different random header each time */
-
-    if (bufSize<RAND_HEAD_LEN)
-      return 0;
-
-    /* First generate RAND_HEAD_LEN-2 random bytes. We encrypt the
-     * output of rand() to get less predictability, since rand() is
-     * often poorly implemented.
-     */
-    if (++calls == 1)
-    {
-        srand((unsigned)(time(NULL) ^ ZCR_SEED2));
-    }
-    init_keys(passwd, pkeys, pcrc_32_tab);
-    for (n = 0; n < RAND_HEAD_LEN-2; n++)
-    {
-        c = (rand() >> 7) & 0xff;
-        header[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, c, t);
-    }
-    /* Encrypt random header (last two bytes is high word of crc) */
-    init_keys(passwd, pkeys, pcrc_32_tab);
-    for (n = 0; n < RAND_HEAD_LEN-2; n++)
-    {
-        buf[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, header[n], t);
-    }
-    buf[n++] = (unsigned char)zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 16) & 0xff, t);
-    buf[n++] = (unsigned char)zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 24) & 0xff, t);
-    return n;
-}
-
-#endif
diff --git a/src/png/zlib/contrib/minizip/ioapi.c b/src/png/zlib/contrib/minizip/ioapi.c
deleted file mode 100644
index 7f5c191b2..000000000
--- a/src/png/zlib/contrib/minizip/ioapi.c
+++ /dev/null
@@ -1,247 +0,0 @@
-/* ioapi.h -- IO base function header for compress/uncompress .zip
-   part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Modifications for Zip64 support
-         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
-
-         For more info read MiniZip_info.txt
-
-*/
-
-#if defined(_WIN32) && (!(defined(_CRT_SECURE_NO_WARNINGS)))
-        #define _CRT_SECURE_NO_WARNINGS
-#endif
-
-#if defined(__APPLE__) || defined(IOAPI_NO_64)
-// In darwin and perhaps other BSD variants off_t is a 64 bit value, hence no need for specific 64 bit functions
-#define FOPEN_FUNC(filename, mode) fopen(filename, mode)
-#define FTELLO_FUNC(stream) ftello(stream)
-#define FSEEKO_FUNC(stream, offset, origin) fseeko(stream, offset, origin)
-#else
-#define FOPEN_FUNC(filename, mode) fopen64(filename, mode)
-#define FTELLO_FUNC(stream) ftello64(stream)
-#define FSEEKO_FUNC(stream, offset, origin) fseeko64(stream, offset, origin)
-#endif
-
-
-#include "ioapi.h"
-
-voidpf call_zopen64 (const zlib_filefunc64_32_def* pfilefunc,const void*filename,int mode)
-{
-    if (pfilefunc->zfile_func64.zopen64_file != NULL)
-        return (*(pfilefunc->zfile_func64.zopen64_file)) (pfilefunc->zfile_func64.opaque,filename,mode);
-    else
-    {
-        return (*(pfilefunc->zopen32_file))(pfilefunc->zfile_func64.opaque,(const char*)filename,mode);
-    }
-}
-
-long call_zseek64 (const zlib_filefunc64_32_def* pfilefunc,voidpf filestream, ZPOS64_T offset, int origin)
-{
-    if (pfilefunc->zfile_func64.zseek64_file != NULL)
-        return (*(pfilefunc->zfile_func64.zseek64_file)) (pfilefunc->zfile_func64.opaque,filestream,offset,origin);
-    else
-    {
-        uLong offsetTruncated = (uLong)offset;
-        if (offsetTruncated != offset)
-            return -1;
-        else
-            return (*(pfilefunc->zseek32_file))(pfilefunc->zfile_func64.opaque,filestream,offsetTruncated,origin);
-    }
-}
-
-ZPOS64_T call_ztell64 (const zlib_filefunc64_32_def* pfilefunc,voidpf filestream)
-{
-    if (pfilefunc->zfile_func64.zseek64_file != NULL)
-        return (*(pfilefunc->zfile_func64.ztell64_file)) (pfilefunc->zfile_func64.opaque,filestream);
-    else
-    {
-        uLong tell_uLong = (*(pfilefunc->ztell32_file))(pfilefunc->zfile_func64.opaque,filestream);
-        if ((tell_uLong) == MAXU32)
-            return (ZPOS64_T)-1;
-        else
-            return tell_uLong;
-    }
-}
-
-void fill_zlib_filefunc64_32_def_from_filefunc32(zlib_filefunc64_32_def* p_filefunc64_32,const zlib_filefunc_def* p_filefunc32)
-{
-    p_filefunc64_32->zfile_func64.zopen64_file = NULL;
-    p_filefunc64_32->zopen32_file = p_filefunc32->zopen_file;
-    p_filefunc64_32->zfile_func64.zerror_file = p_filefunc32->zerror_file;
-    p_filefunc64_32->zfile_func64.zread_file = p_filefunc32->zread_file;
-    p_filefunc64_32->zfile_func64.zwrite_file = p_filefunc32->zwrite_file;
-    p_filefunc64_32->zfile_func64.ztell64_file = NULL;
-    p_filefunc64_32->zfile_func64.zseek64_file = NULL;
-    p_filefunc64_32->zfile_func64.zclose_file = p_filefunc32->zclose_file;
-    p_filefunc64_32->zfile_func64.zerror_file = p_filefunc32->zerror_file;
-    p_filefunc64_32->zfile_func64.opaque = p_filefunc32->opaque;
-    p_filefunc64_32->zseek32_file = p_filefunc32->zseek_file;
-    p_filefunc64_32->ztell32_file = p_filefunc32->ztell_file;
-}
-
-
-
-static voidpf  ZCALLBACK fopen_file_func OF((voidpf opaque, const char* filename, int mode));
-static uLong   ZCALLBACK fread_file_func OF((voidpf opaque, voidpf stream, void* buf, uLong size));
-static uLong   ZCALLBACK fwrite_file_func OF((voidpf opaque, voidpf stream, const void* buf,uLong size));
-static ZPOS64_T ZCALLBACK ftell64_file_func OF((voidpf opaque, voidpf stream));
-static long    ZCALLBACK fseek64_file_func OF((voidpf opaque, voidpf stream, ZPOS64_T offset, int origin));
-static int     ZCALLBACK fclose_file_func OF((voidpf opaque, voidpf stream));
-static int     ZCALLBACK ferror_file_func OF((voidpf opaque, voidpf stream));
-
-static voidpf ZCALLBACK fopen_file_func (voidpf opaque, const char* filename, int mode)
-{
-    FILE* file = NULL;
-    const char* mode_fopen = NULL;
-    if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
-        mode_fopen = "rb";
-    else
-    if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
-        mode_fopen = "r+b";
-    else
-    if (mode & ZLIB_FILEFUNC_MODE_CREATE)
-        mode_fopen = "wb";
-
-    if ((filename!=NULL) && (mode_fopen != NULL))
-        file = fopen(filename, mode_fopen);
-    return file;
-}
-
-static voidpf ZCALLBACK fopen64_file_func (voidpf opaque, const void* filename, int mode)
-{
-    FILE* file = NULL;
-    const char* mode_fopen = NULL;
-    if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
-        mode_fopen = "rb";
-    else
-    if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
-        mode_fopen = "r+b";
-    else
-    if (mode & ZLIB_FILEFUNC_MODE_CREATE)
-        mode_fopen = "wb";
-
-    if ((filename!=NULL) && (mode_fopen != NULL))
-        file = FOPEN_FUNC((const char*)filename, mode_fopen);
-    return file;
-}
-
-
-static uLong ZCALLBACK fread_file_func (voidpf opaque, voidpf stream, void* buf, uLong size)
-{
-    uLong ret;
-    ret = (uLong)fread(buf, 1, (size_t)size, (FILE *)stream);
-    return ret;
-}
-
-static uLong ZCALLBACK fwrite_file_func (voidpf opaque, voidpf stream, const void* buf, uLong size)
-{
-    uLong ret;
-    ret = (uLong)fwrite(buf, 1, (size_t)size, (FILE *)stream);
-    return ret;
-}
-
-static long ZCALLBACK ftell_file_func (voidpf opaque, voidpf stream)
-{
-    long ret;
-    ret = ftell((FILE *)stream);
-    return ret;
-}
-
-
-static ZPOS64_T ZCALLBACK ftell64_file_func (voidpf opaque, voidpf stream)
-{
-    ZPOS64_T ret;
-    ret = FTELLO_FUNC((FILE *)stream);
-    return ret;
-}
-
-static long ZCALLBACK fseek_file_func (voidpf  opaque, voidpf stream, uLong offset, int origin)
-{
-    int fseek_origin=0;
-    long ret;
-    switch (origin)
-    {
-    case ZLIB_FILEFUNC_SEEK_CUR :
-        fseek_origin = SEEK_CUR;
-        break;
-    case ZLIB_FILEFUNC_SEEK_END :
-        fseek_origin = SEEK_END;
-        break;
-    case ZLIB_FILEFUNC_SEEK_SET :
-        fseek_origin = SEEK_SET;
-        break;
-    default: return -1;
-    }
-    ret = 0;
-    if (fseek((FILE *)stream, offset, fseek_origin) != 0)
-        ret = -1;
-    return ret;
-}
-
-static long ZCALLBACK fseek64_file_func (voidpf  opaque, voidpf stream, ZPOS64_T offset, int origin)
-{
-    int fseek_origin=0;
-    long ret;
-    switch (origin)
-    {
-    case ZLIB_FILEFUNC_SEEK_CUR :
-        fseek_origin = SEEK_CUR;
-        break;
-    case ZLIB_FILEFUNC_SEEK_END :
-        fseek_origin = SEEK_END;
-        break;
-    case ZLIB_FILEFUNC_SEEK_SET :
-        fseek_origin = SEEK_SET;
-        break;
-    default: return -1;
-    }
-    ret = 0;
-
-    if(FSEEKO_FUNC((FILE *)stream, offset, fseek_origin) != 0)
-                        ret = -1;
-
-    return ret;
-}
-
-
-static int ZCALLBACK fclose_file_func (voidpf opaque, voidpf stream)
-{
-    int ret;
-    ret = fclose((FILE *)stream);
-    return ret;
-}
-
-static int ZCALLBACK ferror_file_func (voidpf opaque, voidpf stream)
-{
-    int ret;
-    ret = ferror((FILE *)stream);
-    return ret;
-}
-
-void fill_fopen_filefunc (pzlib_filefunc_def)
-  zlib_filefunc_def* pzlib_filefunc_def;
-{
-    pzlib_filefunc_def->zopen_file = fopen_file_func;
-    pzlib_filefunc_def->zread_file = fread_file_func;
-    pzlib_filefunc_def->zwrite_file = fwrite_file_func;
-    pzlib_filefunc_def->ztell_file = ftell_file_func;
-    pzlib_filefunc_def->zseek_file = fseek_file_func;
-    pzlib_filefunc_def->zclose_file = fclose_file_func;
-    pzlib_filefunc_def->zerror_file = ferror_file_func;
-    pzlib_filefunc_def->opaque = NULL;
-}
-
-void fill_fopen64_filefunc (zlib_filefunc64_def*  pzlib_filefunc_def)
-{
-    pzlib_filefunc_def->zopen64_file = fopen64_file_func;
-    pzlib_filefunc_def->zread_file = fread_file_func;
-    pzlib_filefunc_def->zwrite_file = fwrite_file_func;
-    pzlib_filefunc_def->ztell64_file = ftell64_file_func;
-    pzlib_filefunc_def->zseek64_file = fseek64_file_func;
-    pzlib_filefunc_def->zclose_file = fclose_file_func;
-    pzlib_filefunc_def->zerror_file = ferror_file_func;
-    pzlib_filefunc_def->opaque = NULL;
-}
diff --git a/src/png/zlib/contrib/minizip/ioapi.h b/src/png/zlib/contrib/minizip/ioapi.h
deleted file mode 100644
index 8dcbdb06e..000000000
--- a/src/png/zlib/contrib/minizip/ioapi.h
+++ /dev/null
@@ -1,208 +0,0 @@
-/* ioapi.h -- IO base function header for compress/uncompress .zip
-   part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Modifications for Zip64 support
-         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
-
-         For more info read MiniZip_info.txt
-
-         Changes
-
-    Oct-2009 - Defined ZPOS64_T to fpos_t on windows and u_int64_t on linux. (might need to find a better why for this)
-    Oct-2009 - Change to fseeko64, ftello64 and fopen64 so large files would work on linux.
-               More if/def section may be needed to support other platforms
-    Oct-2009 - Defined fxxxx64 calls to normal fopen/ftell/fseek so they would compile on windows.
-                          (but you should use iowin32.c for windows instead)
-
-*/
-
-#ifndef _ZLIBIOAPI64_H
-#define _ZLIBIOAPI64_H
-
-#if (!defined(_WIN32)) && (!defined(WIN32)) && (!defined(__APPLE__))
-
-  // Linux needs this to support file operation on files larger then 4+GB
-  // But might need better if/def to select just the platforms that needs them.
-
-        #ifndef __USE_FILE_OFFSET64
-                #define __USE_FILE_OFFSET64
-        #endif
-        #ifndef __USE_LARGEFILE64
-                #define __USE_LARGEFILE64
-        #endif
-        #ifndef _LARGEFILE64_SOURCE
-                #define _LARGEFILE64_SOURCE
-        #endif
-        #ifndef _FILE_OFFSET_BIT
-                #define _FILE_OFFSET_BIT 64
-        #endif
-
-#endif
-
-#include <stdio.h>
-#include <stdlib.h>
-#include "zlib.h"
-
-#if defined(USE_FILE32API)
-#define fopen64 fopen
-#define ftello64 ftell
-#define fseeko64 fseek
-#else
-#ifdef __FreeBSD__
-#define fopen64 fopen
-#define ftello64 ftello
-#define fseeko64 fseeko
-#endif
-#ifdef _MSC_VER
- #define fopen64 fopen
- #if (_MSC_VER >= 1400) && (!(defined(NO_MSCVER_FILE64_FUNC)))
-  #define ftello64 _ftelli64
-  #define fseeko64 _fseeki64
- #else // old MSC
-  #define ftello64 ftell
-  #define fseeko64 fseek
- #endif
-#endif
-#endif
-
-/*
-#ifndef ZPOS64_T
-  #ifdef _WIN32
-                #define ZPOS64_T fpos_t
-  #else
-    #include <stdint.h>
-    #define ZPOS64_T uint64_t
-  #endif
-#endif
-*/
-
-#ifdef HAVE_MINIZIP64_CONF_H
-#include "mz64conf.h"
-#endif
-
-/* a type choosen by DEFINE */
-#ifdef HAVE_64BIT_INT_CUSTOM
-typedef  64BIT_INT_CUSTOM_TYPE ZPOS64_T;
-#else
-#ifdef HAS_STDINT_H
-#include "stdint.h"
-typedef uint64_t ZPOS64_T;
-#else
-
-/* Maximum unsigned 32-bit value used as placeholder for zip64 */
-#define MAXU32 0xffffffff
-
-#if defined(_MSC_VER) || defined(__BORLANDC__)
-typedef unsigned __int64 ZPOS64_T;
-#else
-typedef unsigned long long int ZPOS64_T;
-#endif
-#endif
-#endif
-
-
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-
-#define ZLIB_FILEFUNC_SEEK_CUR (1)
-#define ZLIB_FILEFUNC_SEEK_END (2)
-#define ZLIB_FILEFUNC_SEEK_SET (0)
-
-#define ZLIB_FILEFUNC_MODE_READ      (1)
-#define ZLIB_FILEFUNC_MODE_WRITE     (2)
-#define ZLIB_FILEFUNC_MODE_READWRITEFILTER (3)
-
-#define ZLIB_FILEFUNC_MODE_EXISTING (4)
-#define ZLIB_FILEFUNC_MODE_CREATE   (8)
-
-
-#ifndef ZCALLBACK
- #if (defined(WIN32) || defined(_WIN32) || defined (WINDOWS) || defined (_WINDOWS)) && defined(CALLBACK) && defined (USEWINDOWS_CALLBACK)
-   #define ZCALLBACK CALLBACK
- #else
-   #define ZCALLBACK
- #endif
-#endif
-
-
-
-
-typedef voidpf   (ZCALLBACK *open_file_func)      OF((voidpf opaque, const char* filename, int mode));
-typedef uLong    (ZCALLBACK *read_file_func)      OF((voidpf opaque, voidpf stream, void* buf, uLong size));
-typedef uLong    (ZCALLBACK *write_file_func)     OF((voidpf opaque, voidpf stream, const void* buf, uLong size));
-typedef int      (ZCALLBACK *close_file_func)     OF((voidpf opaque, voidpf stream));
-typedef int      (ZCALLBACK *testerror_file_func) OF((voidpf opaque, voidpf stream));
-
-typedef long     (ZCALLBACK *tell_file_func)      OF((voidpf opaque, voidpf stream));
-typedef long     (ZCALLBACK *seek_file_func)      OF((voidpf opaque, voidpf stream, uLong offset, int origin));
-
-
-/* here is the "old" 32 bits structure structure */
-typedef struct zlib_filefunc_def_s
-{
-    open_file_func      zopen_file;
-    read_file_func      zread_file;
-    write_file_func     zwrite_file;
-    tell_file_func      ztell_file;
-    seek_file_func      zseek_file;
-    close_file_func     zclose_file;
-    testerror_file_func zerror_file;
-    voidpf              opaque;
-} zlib_filefunc_def;
-
-typedef ZPOS64_T (ZCALLBACK *tell64_file_func)    OF((voidpf opaque, voidpf stream));
-typedef long     (ZCALLBACK *seek64_file_func)    OF((voidpf opaque, voidpf stream, ZPOS64_T offset, int origin));
-typedef voidpf   (ZCALLBACK *open64_file_func)    OF((voidpf opaque, const void* filename, int mode));
-
-typedef struct zlib_filefunc64_def_s
-{
-    open64_file_func    zopen64_file;
-    read_file_func      zread_file;
-    write_file_func     zwrite_file;
-    tell64_file_func    ztell64_file;
-    seek64_file_func    zseek64_file;
-    close_file_func     zclose_file;
-    testerror_file_func zerror_file;
-    voidpf              opaque;
-} zlib_filefunc64_def;
-
-void fill_fopen64_filefunc OF((zlib_filefunc64_def* pzlib_filefunc_def));
-void fill_fopen_filefunc OF((zlib_filefunc_def* pzlib_filefunc_def));
-
-/* now internal definition, only for zip.c and unzip.h */
-typedef struct zlib_filefunc64_32_def_s
-{
-    zlib_filefunc64_def zfile_func64;
-    open_file_func      zopen32_file;
-    tell_file_func      ztell32_file;
-    seek_file_func      zseek32_file;
-} zlib_filefunc64_32_def;
-
-
-#define ZREAD64(filefunc,filestream,buf,size)     ((*((filefunc).zfile_func64.zread_file))   ((filefunc).zfile_func64.opaque,filestream,buf,size))
-#define ZWRITE64(filefunc,filestream,buf,size)    ((*((filefunc).zfile_func64.zwrite_file))  ((filefunc).zfile_func64.opaque,filestream,buf,size))
-//#define ZTELL64(filefunc,filestream)            ((*((filefunc).ztell64_file)) ((filefunc).opaque,filestream))
-//#define ZSEEK64(filefunc,filestream,pos,mode)   ((*((filefunc).zseek64_file)) ((filefunc).opaque,filestream,pos,mode))
-#define ZCLOSE64(filefunc,filestream)             ((*((filefunc).zfile_func64.zclose_file))  ((filefunc).zfile_func64.opaque,filestream))
-#define ZERROR64(filefunc,filestream)             ((*((filefunc).zfile_func64.zerror_file))  ((filefunc).zfile_func64.opaque,filestream))
-
-voidpf call_zopen64 OF((const zlib_filefunc64_32_def* pfilefunc,const void*filename,int mode));
-long    call_zseek64 OF((const zlib_filefunc64_32_def* pfilefunc,voidpf filestream, ZPOS64_T offset, int origin));
-ZPOS64_T call_ztell64 OF((const zlib_filefunc64_32_def* pfilefunc,voidpf filestream));
-
-void    fill_zlib_filefunc64_32_def_from_filefunc32(zlib_filefunc64_32_def* p_filefunc64_32,const zlib_filefunc_def* p_filefunc32);
-
-#define ZOPEN64(filefunc,filename,mode)         (call_zopen64((&(filefunc)),(filename),(mode)))
-#define ZTELL64(filefunc,filestream)            (call_ztell64((&(filefunc)),(filestream)))
-#define ZSEEK64(filefunc,filestream,pos,mode)   (call_zseek64((&(filefunc)),(filestream),(pos),(mode)))
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
diff --git a/src/png/zlib/contrib/minizip/iowin32.c b/src/png/zlib/contrib/minizip/iowin32.c
deleted file mode 100644
index 274f39eb1..000000000
--- a/src/png/zlib/contrib/minizip/iowin32.c
+++ /dev/null
@@ -1,462 +0,0 @@
-/* iowin32.c -- IO base function header for compress/uncompress .zip
-     Version 1.1, February 14h, 2010
-     part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Modifications for Zip64 support
-         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
-
-     For more info read MiniZip_info.txt
-
-*/
-
-#include <stdlib.h>
-
-#include "zlib.h"
-#include "ioapi.h"
-#include "iowin32.h"
-
-#ifndef INVALID_HANDLE_VALUE
-#define INVALID_HANDLE_VALUE (0xFFFFFFFF)
-#endif
-
-#ifndef INVALID_SET_FILE_POINTER
-#define INVALID_SET_FILE_POINTER ((DWORD)-1)
-#endif
-
-
-// see Include/shared/winapifamily.h in the Windows Kit
-#if defined(WINAPI_FAMILY_PARTITION) && (!(defined(IOWIN32_USING_WINRT_API)))
-#if WINAPI_FAMILY_ONE_PARTITION(WINAPI_FAMILY, WINAPI_PARTITION_APP)
-#define IOWIN32_USING_WINRT_API 1
-#endif
-#endif
-
-voidpf  ZCALLBACK win32_open_file_func  OF((voidpf opaque, const char* filename, int mode));
-uLong   ZCALLBACK win32_read_file_func  OF((voidpf opaque, voidpf stream, void* buf, uLong size));
-uLong   ZCALLBACK win32_write_file_func OF((voidpf opaque, voidpf stream, const void* buf, uLong size));
-ZPOS64_T ZCALLBACK win32_tell64_file_func  OF((voidpf opaque, voidpf stream));
-long    ZCALLBACK win32_seek64_file_func  OF((voidpf opaque, voidpf stream, ZPOS64_T offset, int origin));
-int     ZCALLBACK win32_close_file_func OF((voidpf opaque, voidpf stream));
-int     ZCALLBACK win32_error_file_func OF((voidpf opaque, voidpf stream));
-
-typedef struct
-{
-    HANDLE hf;
-    int error;
-} WIN32FILE_IOWIN;
-
-
-static void win32_translate_open_mode(int mode,
-                                      DWORD* lpdwDesiredAccess,
-                                      DWORD* lpdwCreationDisposition,
-                                      DWORD* lpdwShareMode,
-                                      DWORD* lpdwFlagsAndAttributes)
-{
-    *lpdwDesiredAccess = *lpdwShareMode = *lpdwFlagsAndAttributes = *lpdwCreationDisposition = 0;
-
-    if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
-    {
-        *lpdwDesiredAccess = GENERIC_READ;
-        *lpdwCreationDisposition = OPEN_EXISTING;
-        *lpdwShareMode = FILE_SHARE_READ;
-    }
-    else if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
-    {
-        *lpdwDesiredAccess = GENERIC_WRITE | GENERIC_READ;
-        *lpdwCreationDisposition = OPEN_EXISTING;
-    }
-    else if (mode & ZLIB_FILEFUNC_MODE_CREATE)
-    {
-        *lpdwDesiredAccess = GENERIC_WRITE | GENERIC_READ;
-        *lpdwCreationDisposition = CREATE_ALWAYS;
-    }
-}
-
-static voidpf win32_build_iowin(HANDLE hFile)
-{
-    voidpf ret=NULL;
-
-    if ((hFile != NULL) && (hFile != INVALID_HANDLE_VALUE))
-    {
-        WIN32FILE_IOWIN w32fiow;
-        w32fiow.hf = hFile;
-        w32fiow.error = 0;
-        ret = malloc(sizeof(WIN32FILE_IOWIN));
-
-        if (ret==NULL)
-            CloseHandle(hFile);
-        else
-            *((WIN32FILE_IOWIN*)ret) = w32fiow;
-    }
-    return ret;
-}
-
-voidpf ZCALLBACK win32_open64_file_func (voidpf opaque,const void* filename,int mode)
-{
-    const char* mode_fopen = NULL;
-    DWORD dwDesiredAccess,dwCreationDisposition,dwShareMode,dwFlagsAndAttributes ;
-    HANDLE hFile = NULL;
-
-    win32_translate_open_mode(mode,&dwDesiredAccess,&dwCreationDisposition,&dwShareMode,&dwFlagsAndAttributes);
-
-#ifdef IOWIN32_USING_WINRT_API
-#ifdef UNICODE
-    if ((filename!=NULL) && (dwDesiredAccess != 0))
-        hFile = CreateFile2((LPCTSTR)filename, dwDesiredAccess, dwShareMode, dwCreationDisposition, NULL);
-#else
-    if ((filename!=NULL) && (dwDesiredAccess != 0))
-    {
-        WCHAR filenameW[FILENAME_MAX + 0x200 + 1];
-        MultiByteToWideChar(CP_ACP,0,(const char*)filename,-1,filenameW,FILENAME_MAX + 0x200);
-        hFile = CreateFile2(filenameW, dwDesiredAccess, dwShareMode, dwCreationDisposition, NULL);
-    }
-#endif
-#else
-    if ((filename!=NULL) && (dwDesiredAccess != 0))
-        hFile = CreateFile((LPCTSTR)filename, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, dwFlagsAndAttributes, NULL);
-#endif
-
-    return win32_build_iowin(hFile);
-}
-
-
-voidpf ZCALLBACK win32_open64_file_funcA (voidpf opaque,const void* filename,int mode)
-{
-    const char* mode_fopen = NULL;
-    DWORD dwDesiredAccess,dwCreationDisposition,dwShareMode,dwFlagsAndAttributes ;
-    HANDLE hFile = NULL;
-
-    win32_translate_open_mode(mode,&dwDesiredAccess,&dwCreationDisposition,&dwShareMode,&dwFlagsAndAttributes);
-
-#ifdef IOWIN32_USING_WINRT_API
-    if ((filename!=NULL) && (dwDesiredAccess != 0))
-    {
-        WCHAR filenameW[FILENAME_MAX + 0x200 + 1];
-        MultiByteToWideChar(CP_ACP,0,(const char*)filename,-1,filenameW,FILENAME_MAX + 0x200);
-        hFile = CreateFile2(filenameW, dwDesiredAccess, dwShareMode, dwCreationDisposition, NULL);
-    }
-#else
-    if ((filename!=NULL) && (dwDesiredAccess != 0))
-        hFile = CreateFileA((LPCSTR)filename, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, dwFlagsAndAttributes, NULL);
-#endif
-
-    return win32_build_iowin(hFile);
-}
-
-
-voidpf ZCALLBACK win32_open64_file_funcW (voidpf opaque,const void* filename,int mode)
-{
-    const char* mode_fopen = NULL;
-    DWORD dwDesiredAccess,dwCreationDisposition,dwShareMode,dwFlagsAndAttributes ;
-    HANDLE hFile = NULL;
-
-    win32_translate_open_mode(mode,&dwDesiredAccess,&dwCreationDisposition,&dwShareMode,&dwFlagsAndAttributes);
-
-#ifdef IOWIN32_USING_WINRT_API
-    if ((filename!=NULL) && (dwDesiredAccess != 0))
-        hFile = CreateFile2((LPCWSTR)filename, dwDesiredAccess, dwShareMode, dwCreationDisposition,NULL);
-#else
-    if ((filename!=NULL) && (dwDesiredAccess != 0))
-        hFile = CreateFileW((LPCWSTR)filename, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, dwFlagsAndAttributes, NULL);
-#endif
-
-    return win32_build_iowin(hFile);
-}
-
-
-voidpf ZCALLBACK win32_open_file_func (voidpf opaque,const char* filename,int mode)
-{
-    const char* mode_fopen = NULL;
-    DWORD dwDesiredAccess,dwCreationDisposition,dwShareMode,dwFlagsAndAttributes ;
-    HANDLE hFile = NULL;
-
-    win32_translate_open_mode(mode,&dwDesiredAccess,&dwCreationDisposition,&dwShareMode,&dwFlagsAndAttributes);
-
-#ifdef IOWIN32_USING_WINRT_API
-#ifdef UNICODE
-    if ((filename!=NULL) && (dwDesiredAccess != 0))
-        hFile = CreateFile2((LPCTSTR)filename, dwDesiredAccess, dwShareMode, dwCreationDisposition, NULL);
-#else
-    if ((filename!=NULL) && (dwDesiredAccess != 0))
-    {
-        WCHAR filenameW[FILENAME_MAX + 0x200 + 1];
-        MultiByteToWideChar(CP_ACP,0,(const char*)filename,-1,filenameW,FILENAME_MAX + 0x200);
-        hFile = CreateFile2(filenameW, dwDesiredAccess, dwShareMode, dwCreationDisposition, NULL);
-    }
-#endif
-#else
-    if ((filename!=NULL) && (dwDesiredAccess != 0))
-        hFile = CreateFile((LPCTSTR)filename, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, dwFlagsAndAttributes, NULL);
-#endif
-
-    return win32_build_iowin(hFile);
-}
-
-
-uLong ZCALLBACK win32_read_file_func (voidpf opaque, voidpf stream, void* buf,uLong size)
-{
-    uLong ret=0;
-    HANDLE hFile = NULL;
-    if (stream!=NULL)
-        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;
-
-    if (hFile != NULL)
-    {
-        if (!ReadFile(hFile, buf, size, &ret, NULL))
-        {
-            DWORD dwErr = GetLastError();
-            if (dwErr == ERROR_HANDLE_EOF)
-                dwErr = 0;
-            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
-        }
-    }
-
-    return ret;
-}
-
-
-uLong ZCALLBACK win32_write_file_func (voidpf opaque,voidpf stream,const void* buf,uLong size)
-{
-    uLong ret=0;
-    HANDLE hFile = NULL;
-    if (stream!=NULL)
-        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;
-
-    if (hFile != NULL)
-    {
-        if (!WriteFile(hFile, buf, size, &ret, NULL))
-        {
-            DWORD dwErr = GetLastError();
-            if (dwErr == ERROR_HANDLE_EOF)
-                dwErr = 0;
-            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
-        }
-    }
-
-    return ret;
-}
-
-static BOOL MySetFilePointerEx(HANDLE hFile, LARGE_INTEGER pos, LARGE_INTEGER *newPos,  DWORD dwMoveMethod)
-{
-#ifdef IOWIN32_USING_WINRT_API
-    return SetFilePointerEx(hFile, pos, newPos, dwMoveMethod);
-#else
-    LONG lHigh = pos.HighPart;
-    DWORD dwNewPos = SetFilePointer(hFile, pos.LowPart, &lHigh, dwMoveMethod);
-    BOOL fOk = TRUE;
-    if (dwNewPos == 0xFFFFFFFF)
-        if (GetLastError() != NO_ERROR)
-            fOk = FALSE;
-    if ((newPos != NULL) && (fOk))
-    {
-        newPos->LowPart = dwNewPos;
-        newPos->HighPart = lHigh;
-    }
-    return fOk;
-#endif
-}
-
-long ZCALLBACK win32_tell_file_func (voidpf opaque,voidpf stream)
-{
-    long ret=-1;
-    HANDLE hFile = NULL;
-    if (stream!=NULL)
-        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;
-    if (hFile != NULL)
-    {
-        LARGE_INTEGER pos;
-        pos.QuadPart = 0;
-
-        if (!MySetFilePointerEx(hFile, pos, &pos, FILE_CURRENT))
-        {
-            DWORD dwErr = GetLastError();
-            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
-            ret = -1;
-        }
-        else
-            ret=(long)pos.LowPart;
-    }
-    return ret;
-}
-
-ZPOS64_T ZCALLBACK win32_tell64_file_func (voidpf opaque, voidpf stream)
-{
-    ZPOS64_T ret= (ZPOS64_T)-1;
-    HANDLE hFile = NULL;
-    if (stream!=NULL)
-        hFile = ((WIN32FILE_IOWIN*)stream)->hf;
-
-    if (hFile)
-    {
-        LARGE_INTEGER pos;
-        pos.QuadPart = 0;
-
-        if (!MySetFilePointerEx(hFile, pos, &pos, FILE_CURRENT))
-        {
-            DWORD dwErr = GetLastError();
-            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
-            ret = (ZPOS64_T)-1;
-        }
-        else
-            ret=pos.QuadPart;
-    }
-    return ret;
-}
-
-
-long ZCALLBACK win32_seek_file_func (voidpf opaque,voidpf stream,uLong offset,int origin)
-{
-    DWORD dwMoveMethod=0xFFFFFFFF;
-    HANDLE hFile = NULL;
-
-    long ret=-1;
-    if (stream!=NULL)
-        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;
-    switch (origin)
-    {
-    case ZLIB_FILEFUNC_SEEK_CUR :
-        dwMoveMethod = FILE_CURRENT;
-        break;
-    case ZLIB_FILEFUNC_SEEK_END :
-        dwMoveMethod = FILE_END;
-        break;
-    case ZLIB_FILEFUNC_SEEK_SET :
-        dwMoveMethod = FILE_BEGIN;
-        break;
-    default: return -1;
-    }
-
-    if (hFile != NULL)
-    {
-        LARGE_INTEGER pos;
-        pos.QuadPart = offset;
-        if (!MySetFilePointerEx(hFile, pos, NULL, dwMoveMethod))
-        {
-            DWORD dwErr = GetLastError();
-            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
-            ret = -1;
-        }
-        else
-            ret=0;
-    }
-    return ret;
-}
-
-long ZCALLBACK win32_seek64_file_func (voidpf opaque, voidpf stream,ZPOS64_T offset,int origin)
-{
-    DWORD dwMoveMethod=0xFFFFFFFF;
-    HANDLE hFile = NULL;
-    long ret=-1;
-
-    if (stream!=NULL)
-        hFile = ((WIN32FILE_IOWIN*)stream)->hf;
-
-    switch (origin)
-    {
-        case ZLIB_FILEFUNC_SEEK_CUR :
-            dwMoveMethod = FILE_CURRENT;
-            break;
-        case ZLIB_FILEFUNC_SEEK_END :
-            dwMoveMethod = FILE_END;
-            break;
-        case ZLIB_FILEFUNC_SEEK_SET :
-            dwMoveMethod = FILE_BEGIN;
-            break;
-        default: return -1;
-    }
-
-    if (hFile)
-    {
-        LARGE_INTEGER pos;
-        pos.QuadPart = offset;
-        if (!MySetFilePointerEx(hFile, pos, NULL, dwMoveMethod))
-        {
-            DWORD dwErr = GetLastError();
-            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
-            ret = -1;
-        }
-        else
-            ret=0;
-    }
-    return ret;
-}
-
-int ZCALLBACK win32_close_file_func (voidpf opaque, voidpf stream)
-{
-    int ret=-1;
-
-    if (stream!=NULL)
-    {
-        HANDLE hFile;
-        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;
-        if (hFile != NULL)
-        {
-            CloseHandle(hFile);
-            ret=0;
-        }
-        free(stream);
-    }
-    return ret;
-}
-
-int ZCALLBACK win32_error_file_func (voidpf opaque,voidpf stream)
-{
-    int ret=-1;
-    if (stream!=NULL)
-    {
-        ret = ((WIN32FILE_IOWIN*)stream) -> error;
-    }
-    return ret;
-}
-
-void fill_win32_filefunc (zlib_filefunc_def* pzlib_filefunc_def)
-{
-    pzlib_filefunc_def->zopen_file = win32_open_file_func;
-    pzlib_filefunc_def->zread_file = win32_read_file_func;
-    pzlib_filefunc_def->zwrite_file = win32_write_file_func;
-    pzlib_filefunc_def->ztell_file = win32_tell_file_func;
-    pzlib_filefunc_def->zseek_file = win32_seek_file_func;
-    pzlib_filefunc_def->zclose_file = win32_close_file_func;
-    pzlib_filefunc_def->zerror_file = win32_error_file_func;
-    pzlib_filefunc_def->opaque = NULL;
-}
-
-void fill_win32_filefunc64(zlib_filefunc64_def* pzlib_filefunc_def)
-{
-    pzlib_filefunc_def->zopen64_file = win32_open64_file_func;
-    pzlib_filefunc_def->zread_file = win32_read_file_func;
-    pzlib_filefunc_def->zwrite_file = win32_write_file_func;
-    pzlib_filefunc_def->ztell64_file = win32_tell64_file_func;
-    pzlib_filefunc_def->zseek64_file = win32_seek64_file_func;
-    pzlib_filefunc_def->zclose_file = win32_close_file_func;
-    pzlib_filefunc_def->zerror_file = win32_error_file_func;
-    pzlib_filefunc_def->opaque = NULL;
-}
-
-
-void fill_win32_filefunc64A(zlib_filefunc64_def* pzlib_filefunc_def)
-{
-    pzlib_filefunc_def->zopen64_file = win32_open64_file_funcA;
-    pzlib_filefunc_def->zread_file = win32_read_file_func;
-    pzlib_filefunc_def->zwrite_file = win32_write_file_func;
-    pzlib_filefunc_def->ztell64_file = win32_tell64_file_func;
-    pzlib_filefunc_def->zseek64_file = win32_seek64_file_func;
-    pzlib_filefunc_def->zclose_file = win32_close_file_func;
-    pzlib_filefunc_def->zerror_file = win32_error_file_func;
-    pzlib_filefunc_def->opaque = NULL;
-}
-
-
-void fill_win32_filefunc64W(zlib_filefunc64_def* pzlib_filefunc_def)
-{
-    pzlib_filefunc_def->zopen64_file = win32_open64_file_funcW;
-    pzlib_filefunc_def->zread_file = win32_read_file_func;
-    pzlib_filefunc_def->zwrite_file = win32_write_file_func;
-    pzlib_filefunc_def->ztell64_file = win32_tell64_file_func;
-    pzlib_filefunc_def->zseek64_file = win32_seek64_file_func;
-    pzlib_filefunc_def->zclose_file = win32_close_file_func;
-    pzlib_filefunc_def->zerror_file = win32_error_file_func;
-    pzlib_filefunc_def->opaque = NULL;
-}
diff --git a/src/png/zlib/contrib/minizip/iowin32.h b/src/png/zlib/contrib/minizip/iowin32.h
deleted file mode 100644
index 0ca0969a7..000000000
--- a/src/png/zlib/contrib/minizip/iowin32.h
+++ /dev/null
@@ -1,28 +0,0 @@
-/* iowin32.h -- IO base function header for compress/uncompress .zip
-     Version 1.1, February 14h, 2010
-     part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Modifications for Zip64 support
-         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
-
-         For more info read MiniZip_info.txt
-
-*/
-
-#include <windows.h>
-
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-void fill_win32_filefunc OF((zlib_filefunc_def* pzlib_filefunc_def));
-void fill_win32_filefunc64 OF((zlib_filefunc64_def* pzlib_filefunc_def));
-void fill_win32_filefunc64A OF((zlib_filefunc64_def* pzlib_filefunc_def));
-void fill_win32_filefunc64W OF((zlib_filefunc64_def* pzlib_filefunc_def));
-
-#ifdef __cplusplus
-}
-#endif
diff --git a/src/png/zlib/contrib/minizip/make_vms.com b/src/png/zlib/contrib/minizip/make_vms.com
deleted file mode 100644
index 9ac13a98f..000000000
--- a/src/png/zlib/contrib/minizip/make_vms.com
+++ /dev/null
@@ -1,25 +0,0 @@
-$ if f$search("ioapi.h_orig") .eqs. "" then copy ioapi.h ioapi.h_orig
-$ open/write zdef vmsdefs.h
-$ copy sys$input: zdef
-$ deck
-#define unix
-#define fill_zlib_filefunc64_32_def_from_filefunc32 fillzffunc64from
-#define Write_Zip64EndOfCentralDirectoryLocator Write_Zip64EoDLocator
-#define Write_Zip64EndOfCentralDirectoryRecord Write_Zip64EoDRecord
-#define Write_EndOfCentralDirectoryRecord Write_EoDRecord
-$ eod
-$ close zdef
-$ copy vmsdefs.h,ioapi.h_orig ioapi.h
-$ cc/include=[--]/prefix=all ioapi.c
-$ cc/include=[--]/prefix=all miniunz.c
-$ cc/include=[--]/prefix=all unzip.c
-$ cc/include=[--]/prefix=all minizip.c
-$ cc/include=[--]/prefix=all zip.c
-$ link miniunz,unzip,ioapi,[--]libz.olb/lib
-$ link minizip,zip,ioapi,[--]libz.olb/lib
-$ mcr []minizip test minizip_info.txt
-$ mcr []miniunz -l test.zip
-$ rename minizip_info.txt; minizip_info.txt_old
-$ mcr []miniunz test.zip
-$ delete test.zip;*
-$exit
diff --git a/src/png/zlib/contrib/minizip/miniunz.c b/src/png/zlib/contrib/minizip/miniunz.c
deleted file mode 100644
index 3d65401be..000000000
--- a/src/png/zlib/contrib/minizip/miniunz.c
+++ /dev/null
@@ -1,660 +0,0 @@
-/*
-   miniunz.c
-   Version 1.1, February 14h, 2010
-   sample part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Modifications of Unzip for Zip64
-         Copyright (C) 2007-2008 Even Rouault
-
-         Modifications for Zip64 support on both zip and unzip
-         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
-*/
-
-#if (!defined(_WIN32)) && (!defined(WIN32)) && (!defined(__APPLE__))
-        #ifndef __USE_FILE_OFFSET64
-                #define __USE_FILE_OFFSET64
-        #endif
-        #ifndef __USE_LARGEFILE64
-                #define __USE_LARGEFILE64
-        #endif
-        #ifndef _LARGEFILE64_SOURCE
-                #define _LARGEFILE64_SOURCE
-        #endif
-        #ifndef _FILE_OFFSET_BIT
-                #define _FILE_OFFSET_BIT 64
-        #endif
-#endif
-
-#ifdef __APPLE__
-// In darwin and perhaps other BSD variants off_t is a 64 bit value, hence no need for specific 64 bit functions
-#define FOPEN_FUNC(filename, mode) fopen(filename, mode)
-#define FTELLO_FUNC(stream) ftello(stream)
-#define FSEEKO_FUNC(stream, offset, origin) fseeko(stream, offset, origin)
-#else
-#define FOPEN_FUNC(filename, mode) fopen64(filename, mode)
-#define FTELLO_FUNC(stream) ftello64(stream)
-#define FSEEKO_FUNC(stream, offset, origin) fseeko64(stream, offset, origin)
-#endif
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include <errno.h>
-#include <fcntl.h>
-
-#ifdef _WIN32
-# include <direct.h>
-# include <io.h>
-#else
-# include <unistd.h>
-# include <utime.h>
-#endif
-
-
-#include "unzip.h"
-
-#define CASESENSITIVITY (0)
-#define WRITEBUFFERSIZE (8192)
-#define MAXFILENAME (256)
-
-#ifdef _WIN32
-#define USEWIN32IOAPI
-#include "iowin32.h"
-#endif
-/*
-  mini unzip, demo of unzip package
-
-  usage :
-  Usage : miniunz [-exvlo] file.zip [file_to_extract] [-d extractdir]
-
-  list the file in the zipfile, and print the content of FILE_ID.ZIP or README.TXT
-    if it exists
-*/
-
-
-/* change_file_date : change the date/time of a file
-    filename : the filename of the file where date/time must be modified
-    dosdate : the new date at the MSDos format (4 bytes)
-    tmu_date : the SAME new date at the tm_unz format */
-void change_file_date(filename,dosdate,tmu_date)
-    const char *filename;
-    uLong dosdate;
-    tm_unz tmu_date;
-{
-#ifdef _WIN32
-  HANDLE hFile;
-  FILETIME ftm,ftLocal,ftCreate,ftLastAcc,ftLastWrite;
-
-  hFile = CreateFileA(filename,GENERIC_READ | GENERIC_WRITE,
-                      0,NULL,OPEN_EXISTING,0,NULL);
-  GetFileTime(hFile,&ftCreate,&ftLastAcc,&ftLastWrite);
-  DosDateTimeToFileTime((WORD)(dosdate>>16),(WORD)dosdate,&ftLocal);
-  LocalFileTimeToFileTime(&ftLocal,&ftm);
-  SetFileTime(hFile,&ftm,&ftLastAcc,&ftm);
-  CloseHandle(hFile);
-#else
-#ifdef unix || __APPLE__
-  struct utimbuf ut;
-  struct tm newdate;
-  newdate.tm_sec = tmu_date.tm_sec;
-  newdate.tm_min=tmu_date.tm_min;
-  newdate.tm_hour=tmu_date.tm_hour;
-  newdate.tm_mday=tmu_date.tm_mday;
-  newdate.tm_mon=tmu_date.tm_mon;
-  if (tmu_date.tm_year > 1900)
-      newdate.tm_year=tmu_date.tm_year - 1900;
-  else
-      newdate.tm_year=tmu_date.tm_year ;
-  newdate.tm_isdst=-1;
-
-  ut.actime=ut.modtime=mktime(&newdate);
-  utime(filename,&ut);
-#endif
-#endif
-}
-
-
-/* mymkdir and change_file_date are not 100 % portable
-   As I don't know well Unix, I wait feedback for the unix portion */
-
-int mymkdir(dirname)
-    const char* dirname;
-{
-    int ret=0;
-#ifdef _WIN32
-    ret = _mkdir(dirname);
-#elif unix
-    ret = mkdir (dirname,0775);
-#elif __APPLE__
-    ret = mkdir (dirname,0775);
-#endif
-    return ret;
-}
-
-int makedir (newdir)
-    char *newdir;
-{
-  char *buffer ;
-  char *p;
-  int  len = (int)strlen(newdir);
-
-  if (len <= 0)
-    return 0;
-
-  buffer = (char*)malloc(len+1);
-        if (buffer==NULL)
-        {
-                printf("Error allocating memory\n");
-                return UNZ_INTERNALERROR;
-        }
-  strcpy(buffer,newdir);
-
-  if (buffer[len-1] == '/') {
-    buffer[len-1] = '\0';
-  }
-  if (mymkdir(buffer) == 0)
-    {
-      free(buffer);
-      return 1;
-    }
-
-  p = buffer+1;
-  while (1)
-    {
-      char hold;
-
-      while(*p && *p != '\\' && *p != '/')
-        p++;
-      hold = *p;
-      *p = 0;
-      if ((mymkdir(buffer) == -1) && (errno == ENOENT))
-        {
-          printf("couldn't create directory %s\n",buffer);
-          free(buffer);
-          return 0;
-        }
-      if (hold == 0)
-        break;
-      *p++ = hold;
-    }
-  free(buffer);
-  return 1;
-}
-
-void do_banner()
-{
-    printf("MiniUnz 1.01b, demo of zLib + Unz package written by Gilles Vollant\n");
-    printf("more info at http://www.winimage.com/zLibDll/unzip.html\n\n");
-}
-
-void do_help()
-{
-    printf("Usage : miniunz [-e] [-x] [-v] [-l] [-o] [-p password] file.zip [file_to_extr.] [-d extractdir]\n\n" \
-           "  -e  Extract without pathname (junk paths)\n" \
-           "  -x  Extract with pathname\n" \
-           "  -v  list files\n" \
-           "  -l  list files\n" \
-           "  -d  directory to extract into\n" \
-           "  -o  overwrite files without prompting\n" \
-           "  -p  extract crypted file using password\n\n");
-}
-
-void Display64BitsSize(ZPOS64_T n, int size_char)
-{
-  /* to avoid compatibility problem , we do here the conversion */
-  char number[21];
-  int offset=19;
-  int pos_string = 19;
-  number[20]=0;
-  for (;;) {
-      number[offset]=(char)((n%10)+'0');
-      if (number[offset] != '0')
-          pos_string=offset;
-      n/=10;
-      if (offset==0)
-          break;
-      offset--;
-  }
-  {
-      int size_display_string = 19-pos_string;
-      while (size_char > size_display_string)
-      {
-          size_char--;
-          printf(" ");
-      }
-  }
-
-  printf("%s",&number[pos_string]);
-}
-
-int do_list(uf)
-    unzFile uf;
-{
-    uLong i;
-    unz_global_info64 gi;
-    int err;
-
-    err = unzGetGlobalInfo64(uf,&gi);
-    if (err!=UNZ_OK)
-        printf("error %d with zipfile in unzGetGlobalInfo \n",err);
-    printf("  Length  Method     Size Ratio   Date    Time   CRC-32     Name\n");
-    printf("  ------  ------     ---- -----   ----    ----   ------     ----\n");
-    for (i=0;i<gi.number_entry;i++)
-    {
-        char filename_inzip[256];
-        unz_file_info64 file_info;
-        uLong ratio=0;
-        const char *string_method;
-        char charCrypt=' ';
-        err = unzGetCurrentFileInfo64(uf,&file_info,filename_inzip,sizeof(filename_inzip),NULL,0,NULL,0);
-        if (err!=UNZ_OK)
-        {
-            printf("error %d with zipfile in unzGetCurrentFileInfo\n",err);
-            break;
-        }
-        if (file_info.uncompressed_size>0)
-            ratio = (uLong)((file_info.compressed_size*100)/file_info.uncompressed_size);
-
-        /* display a '*' if the file is crypted */
-        if ((file_info.flag & 1) != 0)
-            charCrypt='*';
-
-        if (file_info.compression_method==0)
-            string_method="Stored";
-        else
-        if (file_info.compression_method==Z_DEFLATED)
-        {
-            uInt iLevel=(uInt)((file_info.flag & 0x6)/2);
-            if (iLevel==0)
-              string_method="Defl:N";
-            else if (iLevel==1)
-              string_method="Defl:X";
-            else if ((iLevel==2) || (iLevel==3))
-              string_method="Defl:F"; /* 2:fast , 3 : extra fast*/
-        }
-        else
-        if (file_info.compression_method==Z_BZIP2ED)
-        {
-              string_method="BZip2 ";
-        }
-        else
-            string_method="Unkn. ";
-
-        Display64BitsSize(file_info.uncompressed_size,7);
-        printf("  %6s%c",string_method,charCrypt);
-        Display64BitsSize(file_info.compressed_size,7);
-        printf(" %3lu%%  %2.2lu-%2.2lu-%2.2lu  %2.2lu:%2.2lu  %8.8lx   %s\n",
-                ratio,
-                (uLong)file_info.tmu_date.tm_mon + 1,
-                (uLong)file_info.tmu_date.tm_mday,
-                (uLong)file_info.tmu_date.tm_year % 100,
-                (uLong)file_info.tmu_date.tm_hour,(uLong)file_info.tmu_date.tm_min,
-                (uLong)file_info.crc,filename_inzip);
-        if ((i+1)<gi.number_entry)
-        {
-            err = unzGoToNextFile(uf);
-            if (err!=UNZ_OK)
-            {
-                printf("error %d with zipfile in unzGoToNextFile\n",err);
-                break;
-            }
-        }
-    }
-
-    return 0;
-}
-
-
-int do_extract_currentfile(uf,popt_extract_without_path,popt_overwrite,password)
-    unzFile uf;
-    const int* popt_extract_without_path;
-    int* popt_overwrite;
-    const char* password;
-{
-    char filename_inzip[256];
-    char* filename_withoutpath;
-    char* p;
-    int err=UNZ_OK;
-    FILE *fout=NULL;
-    void* buf;
-    uInt size_buf;
-
-    unz_file_info64 file_info;
-    uLong ratio=0;
-    err = unzGetCurrentFileInfo64(uf,&file_info,filename_inzip,sizeof(filename_inzip),NULL,0,NULL,0);
-
-    if (err!=UNZ_OK)
-    {
-        printf("error %d with zipfile in unzGetCurrentFileInfo\n",err);
-        return err;
-    }
-
-    size_buf = WRITEBUFFERSIZE;
-    buf = (void*)malloc(size_buf);
-    if (buf==NULL)
-    {
-        printf("Error allocating memory\n");
-        return UNZ_INTERNALERROR;
-    }
-
-    p = filename_withoutpath = filename_inzip;
-    while ((*p) != '\0')
-    {
-        if (((*p)=='/') || ((*p)=='\\'))
-            filename_withoutpath = p+1;
-        p++;
-    }
-
-    if ((*filename_withoutpath)=='\0')
-    {
-        if ((*popt_extract_without_path)==0)
-        {
-            printf("creating directory: %s\n",filename_inzip);
-            mymkdir(filename_inzip);
-        }
-    }
-    else
-    {
-        const char* write_filename;
-        int skip=0;
-
-        if ((*popt_extract_without_path)==0)
-            write_filename = filename_inzip;
-        else
-            write_filename = filename_withoutpath;
-
-        err = unzOpenCurrentFilePassword(uf,password);
-        if (err!=UNZ_OK)
-        {
-            printf("error %d with zipfile in unzOpenCurrentFilePassword\n",err);
-        }
-
-        if (((*popt_overwrite)==0) && (err==UNZ_OK))
-        {
-            char rep=0;
-            FILE* ftestexist;
-            ftestexist = FOPEN_FUNC(write_filename,"rb");
-            if (ftestexist!=NULL)
-            {
-                fclose(ftestexist);
-                do
-                {
-                    char answer[128];
-                    int ret;
-
-                    printf("The file %s exists. Overwrite ? [y]es, [n]o, [A]ll: ",write_filename);
-                    ret = scanf("%1s",answer);
-                    if (ret != 1)
-                    {
-                       exit(EXIT_FAILURE);
-                    }
-                    rep = answer[0] ;
-                    if ((rep>='a') && (rep<='z'))
-                        rep -= 0x20;
-                }
-                while ((rep!='Y') && (rep!='N') && (rep!='A'));
-            }
-
-            if (rep == 'N')
-                skip = 1;
-
-            if (rep == 'A')
-                *popt_overwrite=1;
-        }
-
-        if ((skip==0) && (err==UNZ_OK))
-        {
-            fout=FOPEN_FUNC(write_filename,"wb");
-            /* some zipfile don't contain directory alone before file */
-            if ((fout==NULL) && ((*popt_extract_without_path)==0) &&
-                                (filename_withoutpath!=(char*)filename_inzip))
-            {
-                char c=*(filename_withoutpath-1);
-                *(filename_withoutpath-1)='\0';
-                makedir(write_filename);
-                *(filename_withoutpath-1)=c;
-                fout=FOPEN_FUNC(write_filename,"wb");
-            }
-
-            if (fout==NULL)
-            {
-                printf("error opening %s\n",write_filename);
-            }
-        }
-
-        if (fout!=NULL)
-        {
-            printf(" extracting: %s\n",write_filename);
-
-            do
-            {
-                err = unzReadCurrentFile(uf,buf,size_buf);
-                if (err<0)
-                {
-                    printf("error %d with zipfile in unzReadCurrentFile\n",err);
-                    break;
-                }
-                if (err>0)
-                    if (fwrite(buf,err,1,fout)!=1)
-                    {
-                        printf("error in writing extracted file\n");
-                        err=UNZ_ERRNO;
-                        break;
-                    }
-            }
-            while (err>0);
-            if (fout)
-                    fclose(fout);
-
-            if (err==0)
-                change_file_date(write_filename,file_info.dosDate,
-                                 file_info.tmu_date);
-        }
-
-        if (err==UNZ_OK)
-        {
-            err = unzCloseCurrentFile (uf);
-            if (err!=UNZ_OK)
-            {
-                printf("error %d with zipfile in unzCloseCurrentFile\n",err);
-            }
-        }
-        else
-            unzCloseCurrentFile(uf); /* don't lose the error */
-    }
-
-    free(buf);
-    return err;
-}
-
-
-int do_extract(uf,opt_extract_without_path,opt_overwrite,password)
-    unzFile uf;
-    int opt_extract_without_path;
-    int opt_overwrite;
-    const char* password;
-{
-    uLong i;
-    unz_global_info64 gi;
-    int err;
-    FILE* fout=NULL;
-
-    err = unzGetGlobalInfo64(uf,&gi);
-    if (err!=UNZ_OK)
-        printf("error %d with zipfile in unzGetGlobalInfo \n",err);
-
-    for (i=0;i<gi.number_entry;i++)
-    {
-        if (do_extract_currentfile(uf,&opt_extract_without_path,
-                                      &opt_overwrite,
-                                      password) != UNZ_OK)
-            break;
-
-        if ((i+1)<gi.number_entry)
-        {
-            err = unzGoToNextFile(uf);
-            if (err!=UNZ_OK)
-            {
-                printf("error %d with zipfile in unzGoToNextFile\n",err);
-                break;
-            }
-        }
-    }
-
-    return 0;
-}
-
-int do_extract_onefile(uf,filename,opt_extract_without_path,opt_overwrite,password)
-    unzFile uf;
-    const char* filename;
-    int opt_extract_without_path;
-    int opt_overwrite;
-    const char* password;
-{
-    int err = UNZ_OK;
-    if (unzLocateFile(uf,filename,CASESENSITIVITY)!=UNZ_OK)
-    {
-        printf("file %s not found in the zipfile\n",filename);
-        return 2;
-    }
-
-    if (do_extract_currentfile(uf,&opt_extract_without_path,
-                                      &opt_overwrite,
-                                      password) == UNZ_OK)
-        return 0;
-    else
-        return 1;
-}
-
-
-int main(argc,argv)
-    int argc;
-    char *argv[];
-{
-    const char *zipfilename=NULL;
-    const char *filename_to_extract=NULL;
-    const char *password=NULL;
-    char filename_try[MAXFILENAME+16] = "";
-    int i;
-    int ret_value=0;
-    int opt_do_list=0;
-    int opt_do_extract=1;
-    int opt_do_extract_withoutpath=0;
-    int opt_overwrite=0;
-    int opt_extractdir=0;
-    const char *dirname=NULL;
-    unzFile uf=NULL;
-
-    do_banner();
-    if (argc==1)
-    {
-        do_help();
-        return 0;
-    }
-    else
-    {
-        for (i=1;i<argc;i++)
-        {
-            if ((*argv[i])=='-')
-            {
-                const char *p=argv[i]+1;
-
-                while ((*p)!='\0')
-                {
-                    char c=*(p++);;
-                    if ((c=='l') || (c=='L'))
-                        opt_do_list = 1;
-                    if ((c=='v') || (c=='V'))
-                        opt_do_list = 1;
-                    if ((c=='x') || (c=='X'))
-                        opt_do_extract = 1;
-                    if ((c=='e') || (c=='E'))
-                        opt_do_extract = opt_do_extract_withoutpath = 1;
-                    if ((c=='o') || (c=='O'))
-                        opt_overwrite=1;
-                    if ((c=='d') || (c=='D'))
-                    {
-                        opt_extractdir=1;
-                        dirname=argv[i+1];
-                    }
-
-                    if (((c=='p') || (c=='P')) && (i+1<argc))
-                    {
-                        password=argv[i+1];
-                        i++;
-                    }
-                }
-            }
-            else
-            {
-                if (zipfilename == NULL)
-                    zipfilename = argv[i];
-                else if ((filename_to_extract==NULL) && (!opt_extractdir))
-                        filename_to_extract = argv[i] ;
-            }
-        }
-    }
-
-    if (zipfilename!=NULL)
-    {
-
-#        ifdef USEWIN32IOAPI
-        zlib_filefunc64_def ffunc;
-#        endif
-
-        strncpy(filename_try, zipfilename,MAXFILENAME-1);
-        /* strncpy doesnt append the trailing NULL, of the string is too long. */
-        filename_try[ MAXFILENAME ] = '\0';
-
-#        ifdef USEWIN32IOAPI
-        fill_win32_filefunc64A(&ffunc);
-        uf = unzOpen2_64(zipfilename,&ffunc);
-#        else
-        uf = unzOpen64(zipfilename);
-#        endif
-        if (uf==NULL)
-        {
-            strcat(filename_try,".zip");
-#            ifdef USEWIN32IOAPI
-            uf = unzOpen2_64(filename_try,&ffunc);
-#            else
-            uf = unzOpen64(filename_try);
-#            endif
-        }
-    }
-
-    if (uf==NULL)
-    {
-        printf("Cannot open %s or %s.zip\n",zipfilename,zipfilename);
-        return 1;
-    }
-    printf("%s opened\n",filename_try);
-
-    if (opt_do_list==1)
-        ret_value = do_list(uf);
-    else if (opt_do_extract==1)
-    {
-#ifdef _WIN32
-        if (opt_extractdir && _chdir(dirname))
-#else
-        if (opt_extractdir && chdir(dirname))
-#endif
-        {
-          printf("Error changing into %s, aborting\n", dirname);
-          exit(-1);
-        }
-
-        if (filename_to_extract == NULL)
-            ret_value = do_extract(uf, opt_do_extract_withoutpath, opt_overwrite, password);
-        else
-            ret_value = do_extract_onefile(uf, filename_to_extract, opt_do_extract_withoutpath, opt_overwrite, password);
-    }
-
-    unzClose(uf);
-
-    return ret_value;
-}
diff --git a/src/png/zlib/contrib/minizip/miniunzip.1 b/src/png/zlib/contrib/minizip/miniunzip.1
deleted file mode 100644
index 111ac6919..000000000
--- a/src/png/zlib/contrib/minizip/miniunzip.1
+++ /dev/null
@@ -1,63 +0,0 @@
-.\"                                      Hey, EMACS: -*- nroff -*-
-.TH miniunzip 1 "Nov 7, 2001"
-.\" Please adjust this date whenever revising the manpage.
-.\"
-.\" Some roff macros, for reference:
-.\" .nh        disable hyphenation
-.\" .hy        enable hyphenation
-.\" .ad l      left justify
-.\" .ad b      justify to both left and right margins
-.\" .nf        disable filling
-.\" .fi        enable filling
-.\" .br        insert line break
-.\" .sp <n>    insert n+1 empty lines
-.\" for manpage-specific macros, see man(7)
-.SH NAME
-miniunzip - uncompress and examine ZIP archives
-.SH SYNOPSIS
-.B miniunzip
-.RI [ -exvlo ]
-zipfile [ files_to_extract ] [-d tempdir]
-.SH DESCRIPTION
-.B minizip
-is a simple tool which allows the extraction of compressed file
-archives in the ZIP format used by the MS-DOS utility PKZIP.  It was
-written as a demonstration of the
-.IR zlib (3)
-library and therefore lack many of the features of the
-.IR unzip (1)
-program.
-.SH OPTIONS
-A number of options are supported.  With the exception of
-.BI \-d\  tempdir
-these must be supplied before any
-other arguments and are:
-.TP
-.BI \-l\ ,\ \-\-v
-List the files in the archive without extracting them.
-.TP
-.B \-o
-Overwrite files without prompting for confirmation.
-.TP
-.B \-x
-Extract files (default).
-.PP
-The
-.I zipfile
-argument is the name of the archive to process. The next argument can be used
-to specify a single file to extract from the archive.
-
-Lastly, the following option can be specified at the end of the command-line:
-.TP
-.BI \-d\  tempdir
-Extract the archive in the directory
-.I tempdir
-rather than the current directory.
-.SH SEE ALSO
-.BR minizip (1),
-.BR zlib (3),
-.BR unzip (1).
-.SH AUTHOR
-This program was written by Gilles Vollant.  This manual page was
-written by Mark Brown <broonie@sirena.org.uk>. The -d tempdir option
-was added by Dirk Eddelbuettel <edd@debian.org>.
diff --git a/src/png/zlib/contrib/minizip/minizip.1 b/src/png/zlib/contrib/minizip/minizip.1
deleted file mode 100644
index 1154484c1..000000000
--- a/src/png/zlib/contrib/minizip/minizip.1
+++ /dev/null
@@ -1,46 +0,0 @@
-.\"                                      Hey, EMACS: -*- nroff -*-
-.TH minizip 1 "May 2, 2001"
-.\" Please adjust this date whenever revising the manpage.
-.\"
-.\" Some roff macros, for reference:
-.\" .nh        disable hyphenation
-.\" .hy        enable hyphenation
-.\" .ad l      left justify
-.\" .ad b      justify to both left and right margins
-.\" .nf        disable filling
-.\" .fi        enable filling
-.\" .br        insert line break
-.\" .sp <n>    insert n+1 empty lines
-.\" for manpage-specific macros, see man(7)
-.SH NAME
-minizip - create ZIP archives
-.SH SYNOPSIS
-.B minizip
-.RI [ -o ]
-zipfile [ " files" ... ]
-.SH DESCRIPTION
-.B minizip
-is a simple tool which allows the creation of compressed file archives
-in the ZIP format used by the MS-DOS utility PKZIP.  It was written as
-a demonstration of the
-.IR zlib (3)
-library and therefore lack many of the features of the
-.IR zip (1)
-program.
-.SH OPTIONS
-The first argument supplied is the name of the ZIP archive to create or
-.RI -o
-in which case it is ignored and the second argument treated as the
-name of the ZIP file.  If the ZIP file already exists it will be
-overwritten.
-.PP
-Subsequent arguments specify a list of files to place in the ZIP
-archive.  If none are specified then an empty archive will be created.
-.SH SEE ALSO
-.BR miniunzip (1),
-.BR zlib (3),
-.BR zip (1).
-.SH AUTHOR
-This program was written by Gilles Vollant.  This manual page was
-written by Mark Brown <broonie@sirena.org.uk>.
-
diff --git a/src/png/zlib/contrib/minizip/minizip.c b/src/png/zlib/contrib/minizip/minizip.c
deleted file mode 100644
index 4288962ec..000000000
--- a/src/png/zlib/contrib/minizip/minizip.c
+++ /dev/null
@@ -1,520 +0,0 @@
-/*
-   minizip.c
-   Version 1.1, February 14h, 2010
-   sample part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Modifications of Unzip for Zip64
-         Copyright (C) 2007-2008 Even Rouault
-
-         Modifications for Zip64 support on both zip and unzip
-         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
-*/
-
-
-#if (!defined(_WIN32)) && (!defined(WIN32)) && (!defined(__APPLE__))
-        #ifndef __USE_FILE_OFFSET64
-                #define __USE_FILE_OFFSET64
-        #endif
-        #ifndef __USE_LARGEFILE64
-                #define __USE_LARGEFILE64
-        #endif
-        #ifndef _LARGEFILE64_SOURCE
-                #define _LARGEFILE64_SOURCE
-        #endif
-        #ifndef _FILE_OFFSET_BIT
-                #define _FILE_OFFSET_BIT 64
-        #endif
-#endif
-
-#ifdef __APPLE__
-// In darwin and perhaps other BSD variants off_t is a 64 bit value, hence no need for specific 64 bit functions
-#define FOPEN_FUNC(filename, mode) fopen(filename, mode)
-#define FTELLO_FUNC(stream) ftello(stream)
-#define FSEEKO_FUNC(stream, offset, origin) fseeko(stream, offset, origin)
-#else
-#define FOPEN_FUNC(filename, mode) fopen64(filename, mode)
-#define FTELLO_FUNC(stream) ftello64(stream)
-#define FSEEKO_FUNC(stream, offset, origin) fseeko64(stream, offset, origin)
-#endif
-
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include <errno.h>
-#include <fcntl.h>
-
-#ifdef _WIN32
-# include <direct.h>
-# include <io.h>
-#else
-# include <unistd.h>
-# include <utime.h>
-# include <sys/types.h>
-# include <sys/stat.h>
-#endif
-
-#include "zip.h"
-
-#ifdef _WIN32
-        #define USEWIN32IOAPI
-        #include "iowin32.h"
-#endif
-
-
-
-#define WRITEBUFFERSIZE (16384)
-#define MAXFILENAME (256)
-
-#ifdef _WIN32
-uLong filetime(f, tmzip, dt)
-    char *f;                /* name of file to get info on */
-    tm_zip *tmzip;             /* return value: access, modific. and creation times */
-    uLong *dt;             /* dostime */
-{
-  int ret = 0;
-  {
-      FILETIME ftLocal;
-      HANDLE hFind;
-      WIN32_FIND_DATAA ff32;
-
-      hFind = FindFirstFileA(f,&ff32);
-      if (hFind != INVALID_HANDLE_VALUE)
-      {
-        FileTimeToLocalFileTime(&(ff32.ftLastWriteTime),&ftLocal);
-        FileTimeToDosDateTime(&ftLocal,((LPWORD)dt)+1,((LPWORD)dt)+0);
-        FindClose(hFind);
-        ret = 1;
-      }
-  }
-  return ret;
-}
-#else
-#ifdef unix || __APPLE__
-uLong filetime(f, tmzip, dt)
-    char *f;               /* name of file to get info on */
-    tm_zip *tmzip;         /* return value: access, modific. and creation times */
-    uLong *dt;             /* dostime */
-{
-  int ret=0;
-  struct stat s;        /* results of stat() */
-  struct tm* filedate;
-  time_t tm_t=0;
-
-  if (strcmp(f,"-")!=0)
-  {
-    char name[MAXFILENAME+1];
-    int len = strlen(f);
-    if (len > MAXFILENAME)
-      len = MAXFILENAME;
-
-    strncpy(name, f,MAXFILENAME-1);
-    /* strncpy doesnt append the trailing NULL, of the string is too long. */
-    name[ MAXFILENAME ] = '\0';
-
-    if (name[len - 1] == '/')
-      name[len - 1] = '\0';
-    /* not all systems allow stat'ing a file with / appended */
-    if (stat(name,&s)==0)
-    {
-      tm_t = s.st_mtime;
-      ret = 1;
-    }
-  }
-  filedate = localtime(&tm_t);
-
-  tmzip->tm_sec  = filedate->tm_sec;
-  tmzip->tm_min  = filedate->tm_min;
-  tmzip->tm_hour = filedate->tm_hour;
-  tmzip->tm_mday = filedate->tm_mday;
-  tmzip->tm_mon  = filedate->tm_mon ;
-  tmzip->tm_year = filedate->tm_year;
-
-  return ret;
-}
-#else
-uLong filetime(f, tmzip, dt)
-    char *f;                /* name of file to get info on */
-    tm_zip *tmzip;             /* return value: access, modific. and creation times */
-    uLong *dt;             /* dostime */
-{
-    return 0;
-}
-#endif
-#endif
-
-
-
-
-int check_exist_file(filename)
-    const char* filename;
-{
-    FILE* ftestexist;
-    int ret = 1;
-    ftestexist = FOPEN_FUNC(filename,"rb");
-    if (ftestexist==NULL)
-        ret = 0;
-    else
-        fclose(ftestexist);
-    return ret;
-}
-
-void do_banner()
-{
-    printf("MiniZip 1.1, demo of zLib + MiniZip64 package, written by Gilles Vollant\n");
-    printf("more info on MiniZip at http://www.winimage.com/zLibDll/minizip.html\n\n");
-}
-
-void do_help()
-{
-    printf("Usage : minizip [-o] [-a] [-0 to -9] [-p password] [-j] file.zip [files_to_add]\n\n" \
-           "  -o  Overwrite existing file.zip\n" \
-           "  -a  Append to existing file.zip\n" \
-           "  -0  Store only\n" \
-           "  -1  Compress faster\n" \
-           "  -9  Compress better\n\n" \
-           "  -j  exclude path. store only the file name.\n\n");
-}
-
-/* calculate the CRC32 of a file,
-   because to encrypt a file, we need known the CRC32 of the file before */
-int getFileCrc(const char* filenameinzip,void*buf,unsigned long size_buf,unsigned long* result_crc)
-{
-   unsigned long calculate_crc=0;
-   int err=ZIP_OK;
-   FILE * fin = FOPEN_FUNC(filenameinzip,"rb");
-
-   unsigned long size_read = 0;
-   unsigned long total_read = 0;
-   if (fin==NULL)
-   {
-       err = ZIP_ERRNO;
-   }
-
-    if (err == ZIP_OK)
-        do
-        {
-            err = ZIP_OK;
-            size_read = (int)fread(buf,1,size_buf,fin);
-            if (size_read < size_buf)
-                if (feof(fin)==0)
-            {
-                printf("error in reading %s\n",filenameinzip);
-                err = ZIP_ERRNO;
-            }
-
-            if (size_read>0)
-                calculate_crc = crc32(calculate_crc,buf,size_read);
-            total_read += size_read;
-
-        } while ((err == ZIP_OK) && (size_read>0));
-
-    if (fin)
-        fclose(fin);
-
-    *result_crc=calculate_crc;
-    printf("file %s crc %lx\n", filenameinzip, calculate_crc);
-    return err;
-}
-
-int isLargeFile(const char* filename)
-{
-  int largeFile = 0;
-  ZPOS64_T pos = 0;
-  FILE* pFile = FOPEN_FUNC(filename, "rb");
-
-  if(pFile != NULL)
-  {
-    int n = FSEEKO_FUNC(pFile, 0, SEEK_END);
-    pos = FTELLO_FUNC(pFile);
-
-                printf("File : %s is %lld bytes\n", filename, pos);
-
-    if(pos >= 0xffffffff)
-     largeFile = 1;
-
-                fclose(pFile);
-  }
-
- return largeFile;
-}
-
-int main(argc,argv)
-    int argc;
-    char *argv[];
-{
-    int i;
-    int opt_overwrite=0;
-    int opt_compress_level=Z_DEFAULT_COMPRESSION;
-    int opt_exclude_path=0;
-    int zipfilenamearg = 0;
-    char filename_try[MAXFILENAME+16];
-    int zipok;
-    int err=0;
-    int size_buf=0;
-    void* buf=NULL;
-    const char* password=NULL;
-
-
-    do_banner();
-    if (argc==1)
-    {
-        do_help();
-        return 0;
-    }
-    else
-    {
-        for (i=1;i<argc;i++)
-        {
-            if ((*argv[i])=='-')
-            {
-                const char *p=argv[i]+1;
-
-                while ((*p)!='\0')
-                {
-                    char c=*(p++);;
-                    if ((c=='o') || (c=='O'))
-                        opt_overwrite = 1;
-                    if ((c=='a') || (c=='A'))
-                        opt_overwrite = 2;
-                    if ((c>='0') && (c<='9'))
-                        opt_compress_level = c-'0';
-                    if ((c=='j') || (c=='J'))
-                        opt_exclude_path = 1;
-
-                    if (((c=='p') || (c=='P')) && (i+1<argc))
-                    {
-                        password=argv[i+1];
-                        i++;
-                    }
-                }
-            }
-            else
-            {
-                if (zipfilenamearg == 0)
-                {
-                    zipfilenamearg = i ;
-                }
-            }
-        }
-    }
-
-    size_buf = WRITEBUFFERSIZE;
-    buf = (void*)malloc(size_buf);
-    if (buf==NULL)
-    {
-        printf("Error allocating memory\n");
-        return ZIP_INTERNALERROR;
-    }
-
-    if (zipfilenamearg==0)
-    {
-        zipok=0;
-    }
-    else
-    {
-        int i,len;
-        int dot_found=0;
-
-        zipok = 1 ;
-        strncpy(filename_try, argv[zipfilenamearg],MAXFILENAME-1);
-        /* strncpy doesnt append the trailing NULL, of the string is too long. */
-        filename_try[ MAXFILENAME ] = '\0';
-
-        len=(int)strlen(filename_try);
-        for (i=0;i<len;i++)
-            if (filename_try[i]=='.')
-                dot_found=1;
-
-        if (dot_found==0)
-            strcat(filename_try,".zip");
-
-        if (opt_overwrite==2)
-        {
-            /* if the file don't exist, we not append file */
-            if (check_exist_file(filename_try)==0)
-                opt_overwrite=1;
-        }
-        else
-        if (opt_overwrite==0)
-            if (check_exist_file(filename_try)!=0)
-            {
-                char rep=0;
-                do
-                {
-                    char answer[128];
-                    int ret;
-                    printf("The file %s exists. Overwrite ? [y]es, [n]o, [a]ppend : ",filename_try);
-                    ret = scanf("%1s",answer);
-                    if (ret != 1)
-                    {
-                       exit(EXIT_FAILURE);
-                    }
-                    rep = answer[0] ;
-                    if ((rep>='a') && (rep<='z'))
-                        rep -= 0x20;
-                }
-                while ((rep!='Y') && (rep!='N') && (rep!='A'));
-                if (rep=='N')
-                    zipok = 0;
-                if (rep=='A')
-                    opt_overwrite = 2;
-            }
-    }
-
-    if (zipok==1)
-    {
-        zipFile zf;
-        int errclose;
-#        ifdef USEWIN32IOAPI
-        zlib_filefunc64_def ffunc;
-        fill_win32_filefunc64A(&ffunc);
-        zf = zipOpen2_64(filename_try,(opt_overwrite==2) ? 2 : 0,NULL,&ffunc);
-#        else
-        zf = zipOpen64(filename_try,(opt_overwrite==2) ? 2 : 0);
-#        endif
-
-        if (zf == NULL)
-        {
-            printf("error opening %s\n",filename_try);
-            err= ZIP_ERRNO;
-        }
-        else
-            printf("creating %s\n",filename_try);
-
-        for (i=zipfilenamearg+1;(i<argc) && (err==ZIP_OK);i++)
-        {
-            if (!((((*(argv[i]))=='-') || ((*(argv[i]))=='/')) &&
-                  ((argv[i][1]=='o') || (argv[i][1]=='O') ||
-                   (argv[i][1]=='a') || (argv[i][1]=='A') ||
-                   (argv[i][1]=='p') || (argv[i][1]=='P') ||
-                   ((argv[i][1]>='0') || (argv[i][1]<='9'))) &&
-                  (strlen(argv[i]) == 2)))
-            {
-                FILE * fin;
-                int size_read;
-                const char* filenameinzip = argv[i];
-                const char *savefilenameinzip;
-                zip_fileinfo zi;
-                unsigned long crcFile=0;
-                int zip64 = 0;
-
-                zi.tmz_date.tm_sec = zi.tmz_date.tm_min = zi.tmz_date.tm_hour =
-                zi.tmz_date.tm_mday = zi.tmz_date.tm_mon = zi.tmz_date.tm_year = 0;
-                zi.dosDate = 0;
-                zi.internal_fa = 0;
-                zi.external_fa = 0;
-                filetime(filenameinzip,&zi.tmz_date,&zi.dosDate);
-
-/*
-                err = zipOpenNewFileInZip(zf,filenameinzip,&zi,
-                                 NULL,0,NULL,0,NULL / * comment * /,
-                                 (opt_compress_level != 0) ? Z_DEFLATED : 0,
-                                 opt_compress_level);
-*/
-                if ((password != NULL) && (err==ZIP_OK))
-                    err = getFileCrc(filenameinzip,buf,size_buf,&crcFile);
-
-                zip64 = isLargeFile(filenameinzip);
-
-                                                         /* The path name saved, should not include a leading slash. */
-               /*if it did, windows/xp and dynazip couldn't read the zip file. */
-                 savefilenameinzip = filenameinzip;
-                 while( savefilenameinzip[0] == '\\' || savefilenameinzip[0] == '/' )
-                 {
-                     savefilenameinzip++;
-                 }
-
-                 /*should the zip file contain any path at all?*/
-                 if( opt_exclude_path )
-                 {
-                     const char *tmpptr;
-                     const char *lastslash = 0;
-                     for( tmpptr = savefilenameinzip; *tmpptr; tmpptr++)
-                     {
-                         if( *tmpptr == '\\' || *tmpptr == '/')
-                         {
-                             lastslash = tmpptr;
-                         }
-                     }
-                     if( lastslash != NULL )
-                     {
-                         savefilenameinzip = lastslash+1; // base filename follows last slash.
-                     }
-                 }
-
-                 /**/
-                err = zipOpenNewFileInZip3_64(zf,savefilenameinzip,&zi,
-                                 NULL,0,NULL,0,NULL /* comment*/,
-                                 (opt_compress_level != 0) ? Z_DEFLATED : 0,
-                                 opt_compress_level,0,
-                                 /* -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY, */
-                                 -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
-                                 password,crcFile, zip64);
-
-                if (err != ZIP_OK)
-                    printf("error in opening %s in zipfile\n",filenameinzip);
-                else
-                {
-                    fin = FOPEN_FUNC(filenameinzip,"rb");
-                    if (fin==NULL)
-                    {
-                        err=ZIP_ERRNO;
-                        printf("error in opening %s for reading\n",filenameinzip);
-                    }
-                }
-
-                if (err == ZIP_OK)
-                    do
-                    {
-                        err = ZIP_OK;
-                        size_read = (int)fread(buf,1,size_buf,fin);
-                        if (size_read < size_buf)
-                            if (feof(fin)==0)
-                        {
-                            printf("error in reading %s\n",filenameinzip);
-                            err = ZIP_ERRNO;
-                        }
-
-                        if (size_read>0)
-                        {
-                            err = zipWriteInFileInZip (zf,buf,size_read);
-                            if (err<0)
-                            {
-                                printf("error in writing %s in the zipfile\n",
-                                                 filenameinzip);
-                            }
-
-                        }
-                    } while ((err == ZIP_OK) && (size_read>0));
-
-                if (fin)
-                    fclose(fin);
-
-                if (err<0)
-                    err=ZIP_ERRNO;
-                else
-                {
-                    err = zipCloseFileInZip(zf);
-                    if (err!=ZIP_OK)
-                        printf("error in closing %s in the zipfile\n",
-                                    filenameinzip);
-                }
-            }
-        }
-        errclose = zipClose(zf,NULL);
-        if (errclose != ZIP_OK)
-            printf("error in closing %s\n",filename_try);
-    }
-    else
-    {
-       do_help();
-    }
-
-    free(buf);
-    return 0;
-}
diff --git a/src/png/zlib/contrib/minizip/minizip.pc.in b/src/png/zlib/contrib/minizip/minizip.pc.in
deleted file mode 100644
index 69b5b7fdc..000000000
--- a/src/png/zlib/contrib/minizip/minizip.pc.in
+++ /dev/null
@@ -1,12 +0,0 @@
-prefix=@prefix@
-exec_prefix=@exec_prefix@
-libdir=@libdir@
-includedir=@includedir@/minizip
-
-Name: minizip
-Description: Minizip zip file manipulation library
-Requires:
-Version: @PACKAGE_VERSION@
-Libs: -L${libdir} -lminizip
-Libs.private: -lz
-Cflags: -I${includedir}
diff --git a/src/png/zlib/contrib/minizip/mztools.c b/src/png/zlib/contrib/minizip/mztools.c
deleted file mode 100644
index 96891c2e0..000000000
--- a/src/png/zlib/contrib/minizip/mztools.c
+++ /dev/null
@@ -1,291 +0,0 @@
-/*
-  Additional tools for Minizip
-  Code: Xavier Roche '2004
-  License: Same as ZLIB (www.gzip.org)
-*/
-
-/* Code */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include "zlib.h"
-#include "unzip.h"
-
-#define READ_8(adr)  ((unsigned char)*(adr))
-#define READ_16(adr) ( READ_8(adr) | (READ_8(adr+1) << 8) )
-#define READ_32(adr) ( READ_16(adr) | (READ_16((adr)+2) << 16) )
-
-#define WRITE_8(buff, n) do { \
-  *((unsigned char*)(buff)) = (unsigned char) ((n) & 0xff); \
-} while(0)
-#define WRITE_16(buff, n) do { \
-  WRITE_8((unsigned char*)(buff), n); \
-  WRITE_8(((unsigned char*)(buff)) + 1, (n) >> 8); \
-} while(0)
-#define WRITE_32(buff, n) do { \
-  WRITE_16((unsigned char*)(buff), (n) & 0xffff); \
-  WRITE_16((unsigned char*)(buff) + 2, (n) >> 16); \
-} while(0)
-
-extern int ZEXPORT unzRepair(file, fileOut, fileOutTmp, nRecovered, bytesRecovered)
-const char* file;
-const char* fileOut;
-const char* fileOutTmp;
-uLong* nRecovered;
-uLong* bytesRecovered;
-{
-  int err = Z_OK;
-  FILE* fpZip = fopen(file, "rb");
-  FILE* fpOut = fopen(fileOut, "wb");
-  FILE* fpOutCD = fopen(fileOutTmp, "wb");
-  if (fpZip != NULL &&  fpOut != NULL) {
-    int entries = 0;
-    uLong totalBytes = 0;
-    char header[30];
-    char filename[1024];
-    char extra[1024];
-    int offset = 0;
-    int offsetCD = 0;
-    while ( fread(header, 1, 30, fpZip) == 30 ) {
-      int currentOffset = offset;
-
-      /* File entry */
-      if (READ_32(header) == 0x04034b50) {
-        unsigned int version = READ_16(header + 4);
-        unsigned int gpflag = READ_16(header + 6);
-        unsigned int method = READ_16(header + 8);
-        unsigned int filetime = READ_16(header + 10);
-        unsigned int filedate = READ_16(header + 12);
-        unsigned int crc = READ_32(header + 14); /* crc */
-        unsigned int cpsize = READ_32(header + 18); /* compressed size */
-        unsigned int uncpsize = READ_32(header + 22); /* uncompressed sz */
-        unsigned int fnsize = READ_16(header + 26); /* file name length */
-        unsigned int extsize = READ_16(header + 28); /* extra field length */
-        filename[0] = extra[0] = '\0';
-
-        /* Header */
-        if (fwrite(header, 1, 30, fpOut) == 30) {
-          offset += 30;
-        } else {
-          err = Z_ERRNO;
-          break;
-        }
-
-        /* Filename */
-        if (fnsize > 0) {
-          if (fnsize < sizeof(filename)) {
-            if (fread(filename, 1, fnsize, fpZip) == fnsize) {
-                if (fwrite(filename, 1, fnsize, fpOut) == fnsize) {
-                offset += fnsize;
-              } else {
-                err = Z_ERRNO;
-                break;
-              }
-            } else {
-              err = Z_ERRNO;
-              break;
-            }
-          } else {
-            err = Z_ERRNO;
-            break;
-          }
-        } else {
-          err = Z_STREAM_ERROR;
-          break;
-        }
-
-        /* Extra field */
-        if (extsize > 0) {
-          if (extsize < sizeof(extra)) {
-            if (fread(extra, 1, extsize, fpZip) == extsize) {
-              if (fwrite(extra, 1, extsize, fpOut) == extsize) {
-                offset += extsize;
-                } else {
-                err = Z_ERRNO;
-                break;
-              }
-            } else {
-              err = Z_ERRNO;
-              break;
-            }
-          } else {
-            err = Z_ERRNO;
-            break;
-          }
-        }
-
-        /* Data */
-        {
-          int dataSize = cpsize;
-          if (dataSize == 0) {
-            dataSize = uncpsize;
-          }
-          if (dataSize > 0) {
-            char* data = malloc(dataSize);
-            if (data != NULL) {
-              if ((int)fread(data, 1, dataSize, fpZip) == dataSize) {
-                if ((int)fwrite(data, 1, dataSize, fpOut) == dataSize) {
-                  offset += dataSize;
-                  totalBytes += dataSize;
-                } else {
-                  err = Z_ERRNO;
-                }
-              } else {
-                err = Z_ERRNO;
-              }
-              free(data);
-              if (err != Z_OK) {
-                break;
-              }
-            } else {
-              err = Z_MEM_ERROR;
-              break;
-            }
-          }
-        }
-
-        /* Central directory entry */
-        {
-          char header[46];
-          char* comment = "";
-          int comsize = (int) strlen(comment);
-          WRITE_32(header, 0x02014b50);
-          WRITE_16(header + 4, version);
-          WRITE_16(header + 6, version);
-          WRITE_16(header + 8, gpflag);
-          WRITE_16(header + 10, method);
-          WRITE_16(header + 12, filetime);
-          WRITE_16(header + 14, filedate);
-          WRITE_32(header + 16, crc);
-          WRITE_32(header + 20, cpsize);
-          WRITE_32(header + 24, uncpsize);
-          WRITE_16(header + 28, fnsize);
-          WRITE_16(header + 30, extsize);
-          WRITE_16(header + 32, comsize);
-          WRITE_16(header + 34, 0);     /* disk # */
-          WRITE_16(header + 36, 0);     /* int attrb */
-          WRITE_32(header + 38, 0);     /* ext attrb */
-          WRITE_32(header + 42, currentOffset);
-          /* Header */
-          if (fwrite(header, 1, 46, fpOutCD) == 46) {
-            offsetCD += 46;
-
-            /* Filename */
-            if (fnsize > 0) {
-              if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize) {
-                offsetCD += fnsize;
-              } else {
-                err = Z_ERRNO;
-                break;
-              }
-            } else {
-              err = Z_STREAM_ERROR;
-              break;
-            }
-
-            /* Extra field */
-            if (extsize > 0) {
-              if (fwrite(extra, 1, extsize, fpOutCD) == extsize) {
-                offsetCD += extsize;
-              } else {
-                err = Z_ERRNO;
-                break;
-              }
-            }
-
-            /* Comment field */
-            if (comsize > 0) {
-              if ((int)fwrite(comment, 1, comsize, fpOutCD) == comsize) {
-                offsetCD += comsize;
-              } else {
-                err = Z_ERRNO;
-                break;
-              }
-            }
-
-
-          } else {
-            err = Z_ERRNO;
-            break;
-          }
-        }
-
-        /* Success */
-        entries++;
-
-      } else {
-        break;
-      }
-    }
-
-    /* Final central directory  */
-    {
-      int entriesZip = entries;
-      char header[22];
-      char* comment = ""; // "ZIP File recovered by zlib/minizip/mztools";
-      int comsize = (int) strlen(comment);
-      if (entriesZip > 0xffff) {
-        entriesZip = 0xffff;
-      }
-      WRITE_32(header, 0x06054b50);
-      WRITE_16(header + 4, 0);    /* disk # */
-      WRITE_16(header + 6, 0);    /* disk # */
-      WRITE_16(header + 8, entriesZip);   /* hack */
-      WRITE_16(header + 10, entriesZip);  /* hack */
-      WRITE_32(header + 12, offsetCD);    /* size of CD */
-      WRITE_32(header + 16, offset);      /* offset to CD */
-      WRITE_16(header + 20, comsize);     /* comment */
-
-      /* Header */
-      if (fwrite(header, 1, 22, fpOutCD) == 22) {
-
-        /* Comment field */
-        if (comsize > 0) {
-          if ((int)fwrite(comment, 1, comsize, fpOutCD) != comsize) {
-            err = Z_ERRNO;
-          }
-        }
-
-      } else {
-        err = Z_ERRNO;
-      }
-    }
-
-    /* Final merge (file + central directory) */
-    fclose(fpOutCD);
-    if (err == Z_OK) {
-      fpOutCD = fopen(fileOutTmp, "rb");
-      if (fpOutCD != NULL) {
-        int nRead;
-        char buffer[8192];
-        while ( (nRead = (int)fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) {
-          if ((int)fwrite(buffer, 1, nRead, fpOut) != nRead) {
-            err = Z_ERRNO;
-            break;
-          }
-        }
-        fclose(fpOutCD);
-      }
-    }
-
-    /* Close */
-    fclose(fpZip);
-    fclose(fpOut);
-
-    /* Wipe temporary file */
-    (void)remove(fileOutTmp);
-
-    /* Number of recovered entries */
-    if (err == Z_OK) {
-      if (nRecovered != NULL) {
-        *nRecovered = entries;
-      }
-      if (bytesRecovered != NULL) {
-        *bytesRecovered = totalBytes;
-      }
-    }
-  } else {
-    err = Z_STREAM_ERROR;
-  }
-  return err;
-}
diff --git a/src/png/zlib/contrib/minizip/mztools.h b/src/png/zlib/contrib/minizip/mztools.h
deleted file mode 100644
index a49a426ec..000000000
--- a/src/png/zlib/contrib/minizip/mztools.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
-  Additional tools for Minizip
-  Code: Xavier Roche '2004
-  License: Same as ZLIB (www.gzip.org)
-*/
-
-#ifndef _zip_tools_H
-#define _zip_tools_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifndef _ZLIB_H
-#include "zlib.h"
-#endif
-
-#include "unzip.h"
-
-/* Repair a ZIP file (missing central directory)
-   file: file to recover
-   fileOut: output file after recovery
-   fileOutTmp: temporary file name used for recovery
-*/
-extern int ZEXPORT unzRepair(const char* file,
-                             const char* fileOut,
-                             const char* fileOutTmp,
-                             uLong* nRecovered,
-                             uLong* bytesRecovered);
-
-
-#ifdef __cplusplus
-}
-#endif
-
-
-#endif
diff --git a/src/png/zlib/contrib/minizip/unzip.c b/src/png/zlib/contrib/minizip/unzip.c
deleted file mode 100644
index bcfb9416e..000000000
--- a/src/png/zlib/contrib/minizip/unzip.c
+++ /dev/null
@@ -1,2125 +0,0 @@
-/* unzip.c -- IO for uncompress .zip files using zlib
-   Version 1.1, February 14h, 2010
-   part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Modifications of Unzip for Zip64
-         Copyright (C) 2007-2008 Even Rouault
-
-         Modifications for Zip64 support on both zip and unzip
-         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
-
-         For more info read MiniZip_info.txt
-
-
-  ------------------------------------------------------------------------------------
-  Decryption code comes from crypt.c by Info-ZIP but has been greatly reduced in terms of
-  compatibility with older software. The following is from the original crypt.c.
-  Code woven in by Terry Thorsen 1/2003.
-
-  Copyright (c) 1990-2000 Info-ZIP.  All rights reserved.
-
-  See the accompanying file LICENSE, version 2000-Apr-09 or later
-  (the contents of which are also included in zip.h) for terms of use.
-  If, for some reason, all these files are missing, the Info-ZIP license
-  also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
-
-        crypt.c (full version) by Info-ZIP.      Last revised:  [see crypt.h]
-
-  The encryption/decryption parts of this source code (as opposed to the
-  non-echoing password parts) were originally written in Europe.  The
-  whole source package can be freely distributed, including from the USA.
-  (Prior to January 2000, re-export from the US was a violation of US law.)
-
-        This encryption code is a direct transcription of the algorithm from
-  Roger Schlafly, described by Phil Katz in the file appnote.txt.  This
-  file (appnote.txt) is distributed with the PKZIP program (even in the
-  version without encryption capabilities).
-
-        ------------------------------------------------------------------------------------
-
-        Changes in unzip.c
-
-        2007-2008 - Even Rouault - Addition of cpl_unzGetCurrentFileZStreamPos
-  2007-2008 - Even Rouault - Decoration of symbol names unz* -> cpl_unz*
-  2007-2008 - Even Rouault - Remove old C style function prototypes
-  2007-2008 - Even Rouault - Add unzip support for ZIP64
-
-        Copyright (C) 2007-2008 Even Rouault
-
-
-        Oct-2009 - Mathias Svensson - Removed cpl_* from symbol names (Even Rouault added them but since this is now moved to a new project (minizip64) I renamed them again).
-  Oct-2009 - Mathias Svensson - Fixed problem if uncompressed size was > 4G and compressed size was <4G
-                                should only read the compressed/uncompressed size from the Zip64 format if
-                                the size from normal header was 0xFFFFFFFF
-  Oct-2009 - Mathias Svensson - Applied some bug fixes from paches recived from Gilles Vollant
-        Oct-2009 - Mathias Svensson - Applied support to unzip files with compression mathod BZIP2 (bzip2 lib is required)
-                                Patch created by Daniel Borca
-
-  Jan-2010 - back to unzip and minizip 1.0 name scheme, with compatibility layer
-
-  Copyright (C) 1998 - 2010 Gilles Vollant, Even Rouault, Mathias Svensson
-
-*/
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#ifndef NOUNCRYPT
-        #define NOUNCRYPT
-#endif
-
-#include "zlib.h"
-#include "unzip.h"
-
-#ifdef STDC
-#  include <stddef.h>
-#  include <string.h>
-#  include <stdlib.h>
-#endif
-#ifdef NO_ERRNO_H
-    extern int errno;
-#else
-#   include <errno.h>
-#endif
-
-
-#ifndef local
-#  define local static
-#endif
-/* compile with -Dlocal if your debugger can't find static symbols */
-
-
-#ifndef CASESENSITIVITYDEFAULT_NO
-#  if !defined(unix) && !defined(CASESENSITIVITYDEFAULT_YES)
-#    define CASESENSITIVITYDEFAULT_NO
-#  endif
-#endif
-
-
-#ifndef UNZ_BUFSIZE
-#define UNZ_BUFSIZE (16384)
-#endif
-
-#ifndef UNZ_MAXFILENAMEINZIP
-#define UNZ_MAXFILENAMEINZIP (256)
-#endif
-
-#ifndef ALLOC
-# define ALLOC(size) (malloc(size))
-#endif
-#ifndef TRYFREE
-# define TRYFREE(p) {if (p) free(p);}
-#endif
-
-#define SIZECENTRALDIRITEM (0x2e)
-#define SIZEZIPLOCALHEADER (0x1e)
-
-
-const char unz_copyright[] =
-   " unzip 1.01 Copyright 1998-2004 Gilles Vollant - http://www.winimage.com/zLibDll";
-
-/* unz_file_info_interntal contain internal info about a file in zipfile*/
-typedef struct unz_file_info64_internal_s
-{
-    ZPOS64_T offset_curfile;/* relative offset of local header 8 bytes */
-} unz_file_info64_internal;
-
-
-/* file_in_zip_read_info_s contain internal information about a file in zipfile,
-    when reading and decompress it */
-typedef struct
-{
-    char  *read_buffer;         /* internal buffer for compressed data */
-    z_stream stream;            /* zLib stream structure for inflate */
-
-#ifdef HAVE_BZIP2
-    bz_stream bstream;          /* bzLib stream structure for bziped */
-#endif
-
-    ZPOS64_T pos_in_zipfile;       /* position in byte on the zipfile, for fseek*/
-    uLong stream_initialised;   /* flag set if stream structure is initialised*/
-
-    ZPOS64_T offset_local_extrafield;/* offset of the local extra field */
-    uInt  size_local_extrafield;/* size of the local extra field */
-    ZPOS64_T pos_local_extrafield;   /* position in the local extra field in read*/
-    ZPOS64_T total_out_64;
-
-    uLong crc32;                /* crc32 of all data uncompressed */
-    uLong crc32_wait;           /* crc32 we must obtain after decompress all */
-    ZPOS64_T rest_read_compressed; /* number of byte to be decompressed */
-    ZPOS64_T rest_read_uncompressed;/*number of byte to be obtained after decomp*/
-    zlib_filefunc64_32_def z_filefunc;
-    voidpf filestream;        /* io structore of the zipfile */
-    uLong compression_method;   /* compression method (0==store) */
-    ZPOS64_T byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
-    int   raw;
-} file_in_zip64_read_info_s;
-
-
-/* unz64_s contain internal information about the zipfile
-*/
-typedef struct
-{
-    zlib_filefunc64_32_def z_filefunc;
-    int is64bitOpenFunction;
-    voidpf filestream;        /* io structore of the zipfile */
-    unz_global_info64 gi;       /* public global information */
-    ZPOS64_T byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
-    ZPOS64_T num_file;             /* number of the current file in the zipfile*/
-    ZPOS64_T pos_in_central_dir;   /* pos of the current file in the central dir*/
-    ZPOS64_T current_file_ok;      /* flag about the usability of the current file*/
-    ZPOS64_T central_pos;          /* position of the beginning of the central dir*/
-
-    ZPOS64_T size_central_dir;     /* size of the central directory  */
-    ZPOS64_T offset_central_dir;   /* offset of start of central directory with
-                                   respect to the starting disk number */
-
-    unz_file_info64 cur_file_info; /* public info about the current file in zip*/
-    unz_file_info64_internal cur_file_info_internal; /* private info about it*/
-    file_in_zip64_read_info_s* pfile_in_zip_read; /* structure about the current
-                                        file if we are decompressing it */
-    int encrypted;
-
-    int isZip64;
-
-#    ifndef NOUNCRYPT
-    unsigned long keys[3];     /* keys defining the pseudo-random sequence */
-    const z_crc_t* pcrc_32_tab;
-#    endif
-} unz64_s;
-
-
-#ifndef NOUNCRYPT
-#include "crypt.h"
-#endif
-
-/* ===========================================================================
-     Read a byte from a gz_stream; update next_in and avail_in. Return EOF
-   for end of file.
-   IN assertion: the stream s has been successfully opened for reading.
-*/
-
-
-local int unz64local_getByte OF((
-    const zlib_filefunc64_32_def* pzlib_filefunc_def,
-    voidpf filestream,
-    int *pi));
-
-local int unz64local_getByte(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, int *pi)
-{
-    unsigned char c;
-    int err = (int)ZREAD64(*pzlib_filefunc_def,filestream,&c,1);
-    if (err==1)
-    {
-        *pi = (int)c;
-        return UNZ_OK;
-    }
-    else
-    {
-        if (ZERROR64(*pzlib_filefunc_def,filestream))
-            return UNZ_ERRNO;
-        else
-            return UNZ_EOF;
-    }
-}
-
-
-/* ===========================================================================
-   Reads a long in LSB order from the given gz_stream. Sets
-*/
-local int unz64local_getShort OF((
-    const zlib_filefunc64_32_def* pzlib_filefunc_def,
-    voidpf filestream,
-    uLong *pX));
-
-local int unz64local_getShort (const zlib_filefunc64_32_def* pzlib_filefunc_def,
-                             voidpf filestream,
-                             uLong *pX)
-{
-    uLong x ;
-    int i = 0;
-    int err;
-
-    err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x = (uLong)i;
-
-    if (err==UNZ_OK)
-        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x |= ((uLong)i)<<8;
-
-    if (err==UNZ_OK)
-        *pX = x;
-    else
-        *pX = 0;
-    return err;
-}
-
-local int unz64local_getLong OF((
-    const zlib_filefunc64_32_def* pzlib_filefunc_def,
-    voidpf filestream,
-    uLong *pX));
-
-local int unz64local_getLong (const zlib_filefunc64_32_def* pzlib_filefunc_def,
-                            voidpf filestream,
-                            uLong *pX)
-{
-    uLong x ;
-    int i = 0;
-    int err;
-
-    err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x = (uLong)i;
-
-    if (err==UNZ_OK)
-        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x |= ((uLong)i)<<8;
-
-    if (err==UNZ_OK)
-        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x |= ((uLong)i)<<16;
-
-    if (err==UNZ_OK)
-        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x += ((uLong)i)<<24;
-
-    if (err==UNZ_OK)
-        *pX = x;
-    else
-        *pX = 0;
-    return err;
-}
-
-local int unz64local_getLong64 OF((
-    const zlib_filefunc64_32_def* pzlib_filefunc_def,
-    voidpf filestream,
-    ZPOS64_T *pX));
-
-
-local int unz64local_getLong64 (const zlib_filefunc64_32_def* pzlib_filefunc_def,
-                            voidpf filestream,
-                            ZPOS64_T *pX)
-{
-    ZPOS64_T x ;
-    int i = 0;
-    int err;
-
-    err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x = (ZPOS64_T)i;
-
-    if (err==UNZ_OK)
-        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x |= ((ZPOS64_T)i)<<8;
-
-    if (err==UNZ_OK)
-        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x |= ((ZPOS64_T)i)<<16;
-
-    if (err==UNZ_OK)
-        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x |= ((ZPOS64_T)i)<<24;
-
-    if (err==UNZ_OK)
-        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x |= ((ZPOS64_T)i)<<32;
-
-    if (err==UNZ_OK)
-        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x |= ((ZPOS64_T)i)<<40;
-
-    if (err==UNZ_OK)
-        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x |= ((ZPOS64_T)i)<<48;
-
-    if (err==UNZ_OK)
-        err = unz64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x |= ((ZPOS64_T)i)<<56;
-
-    if (err==UNZ_OK)
-        *pX = x;
-    else
-        *pX = 0;
-    return err;
-}
-
-/* My own strcmpi / strcasecmp */
-local int strcmpcasenosensitive_internal (const char* fileName1, const char* fileName2)
-{
-    for (;;)
-    {
-        char c1=*(fileName1++);
-        char c2=*(fileName2++);
-        if ((c1>='a') && (c1<='z'))
-            c1 -= 0x20;
-        if ((c2>='a') && (c2<='z'))
-            c2 -= 0x20;
-        if (c1=='\0')
-            return ((c2=='\0') ? 0 : -1);
-        if (c2=='\0')
-            return 1;
-        if (c1<c2)
-            return -1;
-        if (c1>c2)
-            return 1;
-    }
-}
-
-
-#ifdef  CASESENSITIVITYDEFAULT_NO
-#define CASESENSITIVITYDEFAULTVALUE 2
-#else
-#define CASESENSITIVITYDEFAULTVALUE 1
-#endif
-
-#ifndef STRCMPCASENOSENTIVEFUNCTION
-#define STRCMPCASENOSENTIVEFUNCTION strcmpcasenosensitive_internal
-#endif
-
-/*
-   Compare two filename (fileName1,fileName2).
-   If iCaseSenisivity = 1, comparision is case sensitivity (like strcmp)
-   If iCaseSenisivity = 2, comparision is not case sensitivity (like strcmpi
-                                                                or strcasecmp)
-   If iCaseSenisivity = 0, case sensitivity is defaut of your operating system
-        (like 1 on Unix, 2 on Windows)
-
-*/
-extern int ZEXPORT unzStringFileNameCompare (const char*  fileName1,
-                                                 const char*  fileName2,
-                                                 int iCaseSensitivity)
-
-{
-    if (iCaseSensitivity==0)
-        iCaseSensitivity=CASESENSITIVITYDEFAULTVALUE;
-
-    if (iCaseSensitivity==1)
-        return strcmp(fileName1,fileName2);
-
-    return STRCMPCASENOSENTIVEFUNCTION(fileName1,fileName2);
-}
-
-#ifndef BUFREADCOMMENT
-#define BUFREADCOMMENT (0x400)
-#endif
-
-/*
-  Locate the Central directory of a zipfile (at the end, just before
-    the global comment)
-*/
-local ZPOS64_T unz64local_SearchCentralDir OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream));
-local ZPOS64_T unz64local_SearchCentralDir(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream)
-{
-    unsigned char* buf;
-    ZPOS64_T uSizeFile;
-    ZPOS64_T uBackRead;
-    ZPOS64_T uMaxBack=0xffff; /* maximum size of global comment */
-    ZPOS64_T uPosFound=0;
-
-    if (ZSEEK64(*pzlib_filefunc_def,filestream,0,ZLIB_FILEFUNC_SEEK_END) != 0)
-        return 0;
-
-
-    uSizeFile = ZTELL64(*pzlib_filefunc_def,filestream);
-
-    if (uMaxBack>uSizeFile)
-        uMaxBack = uSizeFile;
-
-    buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
-    if (buf==NULL)
-        return 0;
-
-    uBackRead = 4;
-    while (uBackRead<uMaxBack)
-    {
-        uLong uReadSize;
-        ZPOS64_T uReadPos ;
-        int i;
-        if (uBackRead+BUFREADCOMMENT>uMaxBack)
-            uBackRead = uMaxBack;
-        else
-            uBackRead+=BUFREADCOMMENT;
-        uReadPos = uSizeFile-uBackRead ;
-
-        uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
-                     (BUFREADCOMMENT+4) : (uLong)(uSizeFile-uReadPos);
-        if (ZSEEK64(*pzlib_filefunc_def,filestream,uReadPos,ZLIB_FILEFUNC_SEEK_SET)!=0)
-            break;
-
-        if (ZREAD64(*pzlib_filefunc_def,filestream,buf,uReadSize)!=uReadSize)
-            break;
-
-        for (i=(int)uReadSize-3; (i--)>0;)
-            if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) &&
-                ((*(buf+i+2))==0x05) && ((*(buf+i+3))==0x06))
-            {
-                uPosFound = uReadPos+i;
-                break;
-            }
-
-        if (uPosFound!=0)
-            break;
-    }
-    TRYFREE(buf);
-    return uPosFound;
-}
-
-
-/*
-  Locate the Central directory 64 of a zipfile (at the end, just before
-    the global comment)
-*/
-local ZPOS64_T unz64local_SearchCentralDir64 OF((
-    const zlib_filefunc64_32_def* pzlib_filefunc_def,
-    voidpf filestream));
-
-local ZPOS64_T unz64local_SearchCentralDir64(const zlib_filefunc64_32_def* pzlib_filefunc_def,
-                                      voidpf filestream)
-{
-    unsigned char* buf;
-    ZPOS64_T uSizeFile;
-    ZPOS64_T uBackRead;
-    ZPOS64_T uMaxBack=0xffff; /* maximum size of global comment */
-    ZPOS64_T uPosFound=0;
-    uLong uL;
-                ZPOS64_T relativeOffset;
-
-    if (ZSEEK64(*pzlib_filefunc_def,filestream,0,ZLIB_FILEFUNC_SEEK_END) != 0)
-        return 0;
-
-
-    uSizeFile = ZTELL64(*pzlib_filefunc_def,filestream);
-
-    if (uMaxBack>uSizeFile)
-        uMaxBack = uSizeFile;
-
-    buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
-    if (buf==NULL)
-        return 0;
-
-    uBackRead = 4;
-    while (uBackRead<uMaxBack)
-    {
-        uLong uReadSize;
-        ZPOS64_T uReadPos;
-        int i;
-        if (uBackRead+BUFREADCOMMENT>uMaxBack)
-            uBackRead = uMaxBack;
-        else
-            uBackRead+=BUFREADCOMMENT;
-        uReadPos = uSizeFile-uBackRead ;
-
-        uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
-                     (BUFREADCOMMENT+4) : (uLong)(uSizeFile-uReadPos);
-        if (ZSEEK64(*pzlib_filefunc_def,filestream,uReadPos,ZLIB_FILEFUNC_SEEK_SET)!=0)
-            break;
-
-        if (ZREAD64(*pzlib_filefunc_def,filestream,buf,uReadSize)!=uReadSize)
-            break;
-
-        for (i=(int)uReadSize-3; (i--)>0;)
-            if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) &&
-                ((*(buf+i+2))==0x06) && ((*(buf+i+3))==0x07))
-            {
-                uPosFound = uReadPos+i;
-                break;
-            }
-
-        if (uPosFound!=0)
-            break;
-    }
-    TRYFREE(buf);
-    if (uPosFound == 0)
-        return 0;
-
-    /* Zip64 end of central directory locator */
-    if (ZSEEK64(*pzlib_filefunc_def,filestream, uPosFound,ZLIB_FILEFUNC_SEEK_SET)!=0)
-        return 0;
-
-    /* the signature, already checked */
-    if (unz64local_getLong(pzlib_filefunc_def,filestream,&uL)!=UNZ_OK)
-        return 0;
-
-    /* number of the disk with the start of the zip64 end of  central directory */
-    if (unz64local_getLong(pzlib_filefunc_def,filestream,&uL)!=UNZ_OK)
-        return 0;
-    if (uL != 0)
-        return 0;
-
-    /* relative offset of the zip64 end of central directory record */
-    if (unz64local_getLong64(pzlib_filefunc_def,filestream,&relativeOffset)!=UNZ_OK)
-        return 0;
-
-    /* total number of disks */
-    if (unz64local_getLong(pzlib_filefunc_def,filestream,&uL)!=UNZ_OK)
-        return 0;
-    if (uL != 1)
-        return 0;
-
-    /* Goto end of central directory record */
-    if (ZSEEK64(*pzlib_filefunc_def,filestream, relativeOffset,ZLIB_FILEFUNC_SEEK_SET)!=0)
-        return 0;
-
-     /* the signature */
-    if (unz64local_getLong(pzlib_filefunc_def,filestream,&uL)!=UNZ_OK)
-        return 0;
-
-    if (uL != 0x06064b50)
-        return 0;
-
-    return relativeOffset;
-}
-
-/*
-  Open a Zip file. path contain the full pathname (by example,
-     on a Windows NT computer "c:\\test\\zlib114.zip" or on an Unix computer
-     "zlib/zlib114.zip".
-     If the zipfile cannot be opened (file doesn't exist or in not valid), the
-       return value is NULL.
-     Else, the return value is a unzFile Handle, usable with other function
-       of this unzip package.
-*/
-local unzFile unzOpenInternal (const void *path,
-                               zlib_filefunc64_32_def* pzlib_filefunc64_32_def,
-                               int is64bitOpenFunction)
-{
-    unz64_s us;
-    unz64_s *s;
-    ZPOS64_T central_pos;
-    uLong   uL;
-
-    uLong number_disk;          /* number of the current dist, used for
-                                   spaning ZIP, unsupported, always 0*/
-    uLong number_disk_with_CD;  /* number the the disk with central dir, used
-                                   for spaning ZIP, unsupported, always 0*/
-    ZPOS64_T number_entry_CD;      /* total number of entries in
-                                   the central dir
-                                   (same than number_entry on nospan) */
-
-    int err=UNZ_OK;
-
-    if (unz_copyright[0]!=' ')
-        return NULL;
-
-    us.z_filefunc.zseek32_file = NULL;
-    us.z_filefunc.ztell32_file = NULL;
-    if (pzlib_filefunc64_32_def==NULL)
-        fill_fopen64_filefunc(&us.z_filefunc.zfile_func64);
-    else
-        us.z_filefunc = *pzlib_filefunc64_32_def;
-    us.is64bitOpenFunction = is64bitOpenFunction;
-
-
-
-    us.filestream = ZOPEN64(us.z_filefunc,
-                                                 path,
-                                                 ZLIB_FILEFUNC_MODE_READ |
-                                                 ZLIB_FILEFUNC_MODE_EXISTING);
-    if (us.filestream==NULL)
-        return NULL;
-
-    central_pos = unz64local_SearchCentralDir64(&us.z_filefunc,us.filestream);
-    if (central_pos)
-    {
-        uLong uS;
-        ZPOS64_T uL64;
-
-        us.isZip64 = 1;
-
-        if (ZSEEK64(us.z_filefunc, us.filestream,
-                                      central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
-        err=UNZ_ERRNO;
-
-        /* the signature, already checked */
-        if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
-            err=UNZ_ERRNO;
-
-        /* size of zip64 end of central directory record */
-        if (unz64local_getLong64(&us.z_filefunc, us.filestream,&uL64)!=UNZ_OK)
-            err=UNZ_ERRNO;
-
-        /* version made by */
-        if (unz64local_getShort(&us.z_filefunc, us.filestream,&uS)!=UNZ_OK)
-            err=UNZ_ERRNO;
-
-        /* version needed to extract */
-        if (unz64local_getShort(&us.z_filefunc, us.filestream,&uS)!=UNZ_OK)
-            err=UNZ_ERRNO;
-
-        /* number of this disk */
-        if (unz64local_getLong(&us.z_filefunc, us.filestream,&number_disk)!=UNZ_OK)
-            err=UNZ_ERRNO;
-
-        /* number of the disk with the start of the central directory */
-        if (unz64local_getLong(&us.z_filefunc, us.filestream,&number_disk_with_CD)!=UNZ_OK)
-            err=UNZ_ERRNO;
-
-        /* total number of entries in the central directory on this disk */
-        if (unz64local_getLong64(&us.z_filefunc, us.filestream,&us.gi.number_entry)!=UNZ_OK)
-            err=UNZ_ERRNO;
-
-        /* total number of entries in the central directory */
-        if (unz64local_getLong64(&us.z_filefunc, us.filestream,&number_entry_CD)!=UNZ_OK)
-            err=UNZ_ERRNO;
-
-        if ((number_entry_CD!=us.gi.number_entry) ||
-            (number_disk_with_CD!=0) ||
-            (number_disk!=0))
-            err=UNZ_BADZIPFILE;
-
-        /* size of the central directory */
-        if (unz64local_getLong64(&us.z_filefunc, us.filestream,&us.size_central_dir)!=UNZ_OK)
-            err=UNZ_ERRNO;
-
-        /* offset of start of central directory with respect to the
-          starting disk number */
-        if (unz64local_getLong64(&us.z_filefunc, us.filestream,&us.offset_central_dir)!=UNZ_OK)
-            err=UNZ_ERRNO;
-
-        us.gi.size_comment = 0;
-    }
-    else
-    {
-        central_pos = unz64local_SearchCentralDir(&us.z_filefunc,us.filestream);
-        if (central_pos==0)
-            err=UNZ_ERRNO;
-
-        us.isZip64 = 0;
-
-        if (ZSEEK64(us.z_filefunc, us.filestream,
-                                        central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
-            err=UNZ_ERRNO;
-
-        /* the signature, already checked */
-        if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
-            err=UNZ_ERRNO;
-
-        /* number of this disk */
-        if (unz64local_getShort(&us.z_filefunc, us.filestream,&number_disk)!=UNZ_OK)
-            err=UNZ_ERRNO;
-
-        /* number of the disk with the start of the central directory */
-        if (unz64local_getShort(&us.z_filefunc, us.filestream,&number_disk_with_CD)!=UNZ_OK)
-            err=UNZ_ERRNO;
-
-        /* total number of entries in the central dir on this disk */
-        if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
-            err=UNZ_ERRNO;
-        us.gi.number_entry = uL;
-
-        /* total number of entries in the central dir */
-        if (unz64local_getShort(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
-            err=UNZ_ERRNO;
-        number_entry_CD = uL;
-
-        if ((number_entry_CD!=us.gi.number_entry) ||
-            (number_disk_with_CD!=0) ||
-            (number_disk!=0))
-            err=UNZ_BADZIPFILE;
-
-        /* size of the central directory */
-        if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
-            err=UNZ_ERRNO;
-        us.size_central_dir = uL;
-
-        /* offset of start of central directory with respect to the
-            starting disk number */
-        if (unz64local_getLong(&us.z_filefunc, us.filestream,&uL)!=UNZ_OK)
-            err=UNZ_ERRNO;
-        us.offset_central_dir = uL;
-
-        /* zipfile comment length */
-        if (unz64local_getShort(&us.z_filefunc, us.filestream,&us.gi.size_comment)!=UNZ_OK)
-            err=UNZ_ERRNO;
-    }
-
-    if ((central_pos<us.offset_central_dir+us.size_central_dir) &&
-        (err==UNZ_OK))
-        err=UNZ_BADZIPFILE;
-
-    if (err!=UNZ_OK)
-    {
-        ZCLOSE64(us.z_filefunc, us.filestream);
-        return NULL;
-    }
-
-    us.byte_before_the_zipfile = central_pos -
-                            (us.offset_central_dir+us.size_central_dir);
-    us.central_pos = central_pos;
-    us.pfile_in_zip_read = NULL;
-    us.encrypted = 0;
-
-
-    s=(unz64_s*)ALLOC(sizeof(unz64_s));
-    if( s != NULL)
-    {
-        *s=us;
-        unzGoToFirstFile((unzFile)s);
-    }
-    return (unzFile)s;
-}
-
-
-extern unzFile ZEXPORT unzOpen2 (const char *path,
-                                        zlib_filefunc_def* pzlib_filefunc32_def)
-{
-    if (pzlib_filefunc32_def != NULL)
-    {
-        zlib_filefunc64_32_def zlib_filefunc64_32_def_fill;
-        fill_zlib_filefunc64_32_def_from_filefunc32(&zlib_filefunc64_32_def_fill,pzlib_filefunc32_def);
-        return unzOpenInternal(path, &zlib_filefunc64_32_def_fill, 0);
-    }
-    else
-        return unzOpenInternal(path, NULL, 0);
-}
-
-extern unzFile ZEXPORT unzOpen2_64 (const void *path,
-                                     zlib_filefunc64_def* pzlib_filefunc_def)
-{
-    if (pzlib_filefunc_def != NULL)
-    {
-        zlib_filefunc64_32_def zlib_filefunc64_32_def_fill;
-        zlib_filefunc64_32_def_fill.zfile_func64 = *pzlib_filefunc_def;
-        zlib_filefunc64_32_def_fill.ztell32_file = NULL;
-        zlib_filefunc64_32_def_fill.zseek32_file = NULL;
-        return unzOpenInternal(path, &zlib_filefunc64_32_def_fill, 1);
-    }
-    else
-        return unzOpenInternal(path, NULL, 1);
-}
-
-extern unzFile ZEXPORT unzOpen (const char *path)
-{
-    return unzOpenInternal(path, NULL, 0);
-}
-
-extern unzFile ZEXPORT unzOpen64 (const void *path)
-{
-    return unzOpenInternal(path, NULL, 1);
-}
-
-/*
-  Close a ZipFile opened with unzOpen.
-  If there is files inside the .Zip opened with unzOpenCurrentFile (see later),
-    these files MUST be closed with unzCloseCurrentFile before call unzClose.
-  return UNZ_OK if there is no problem. */
-extern int ZEXPORT unzClose (unzFile file)
-{
-    unz64_s* s;
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-
-    if (s->pfile_in_zip_read!=NULL)
-        unzCloseCurrentFile(file);
-
-    ZCLOSE64(s->z_filefunc, s->filestream);
-    TRYFREE(s);
-    return UNZ_OK;
-}
-
-
-/*
-  Write info about the ZipFile in the *pglobal_info structure.
-  No preparation of the structure is needed
-  return UNZ_OK if there is no problem. */
-extern int ZEXPORT unzGetGlobalInfo64 (unzFile file, unz_global_info64* pglobal_info)
-{
-    unz64_s* s;
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-    *pglobal_info=s->gi;
-    return UNZ_OK;
-}
-
-extern int ZEXPORT unzGetGlobalInfo (unzFile file, unz_global_info* pglobal_info32)
-{
-    unz64_s* s;
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-    /* to do : check if number_entry is not truncated */
-    pglobal_info32->number_entry = (uLong)s->gi.number_entry;
-    pglobal_info32->size_comment = s->gi.size_comment;
-    return UNZ_OK;
-}
-/*
-   Translate date/time from Dos format to tm_unz (readable more easilty)
-*/
-local void unz64local_DosDateToTmuDate (ZPOS64_T ulDosDate, tm_unz* ptm)
-{
-    ZPOS64_T uDate;
-    uDate = (ZPOS64_T)(ulDosDate>>16);
-    ptm->tm_mday = (uInt)(uDate&0x1f) ;
-    ptm->tm_mon =  (uInt)((((uDate)&0x1E0)/0x20)-1) ;
-    ptm->tm_year = (uInt)(((uDate&0x0FE00)/0x0200)+1980) ;
-
-    ptm->tm_hour = (uInt) ((ulDosDate &0xF800)/0x800);
-    ptm->tm_min =  (uInt) ((ulDosDate&0x7E0)/0x20) ;
-    ptm->tm_sec =  (uInt) (2*(ulDosDate&0x1f)) ;
-}
-
-/*
-  Get Info about the current file in the zipfile, with internal only info
-*/
-local int unz64local_GetCurrentFileInfoInternal OF((unzFile file,
-                                                  unz_file_info64 *pfile_info,
-                                                  unz_file_info64_internal
-                                                  *pfile_info_internal,
-                                                  char *szFileName,
-                                                  uLong fileNameBufferSize,
-                                                  void *extraField,
-                                                  uLong extraFieldBufferSize,
-                                                  char *szComment,
-                                                  uLong commentBufferSize));
-
-local int unz64local_GetCurrentFileInfoInternal (unzFile file,
-                                                  unz_file_info64 *pfile_info,
-                                                  unz_file_info64_internal
-                                                  *pfile_info_internal,
-                                                  char *szFileName,
-                                                  uLong fileNameBufferSize,
-                                                  void *extraField,
-                                                  uLong extraFieldBufferSize,
-                                                  char *szComment,
-                                                  uLong commentBufferSize)
-{
-    unz64_s* s;
-    unz_file_info64 file_info;
-    unz_file_info64_internal file_info_internal;
-    int err=UNZ_OK;
-    uLong uMagic;
-    long lSeek=0;
-    uLong uL;
-
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-    if (ZSEEK64(s->z_filefunc, s->filestream,
-              s->pos_in_central_dir+s->byte_before_the_zipfile,
-              ZLIB_FILEFUNC_SEEK_SET)!=0)
-        err=UNZ_ERRNO;
-
-
-    /* we check the magic */
-    if (err==UNZ_OK)
-    {
-        if (unz64local_getLong(&s->z_filefunc, s->filestream,&uMagic) != UNZ_OK)
-            err=UNZ_ERRNO;
-        else if (uMagic!=0x02014b50)
-            err=UNZ_BADZIPFILE;
-    }
-
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.version) != UNZ_OK)
-        err=UNZ_ERRNO;
-
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.version_needed) != UNZ_OK)
-        err=UNZ_ERRNO;
-
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.flag) != UNZ_OK)
-        err=UNZ_ERRNO;
-
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.compression_method) != UNZ_OK)
-        err=UNZ_ERRNO;
-
-    if (unz64local_getLong(&s->z_filefunc, s->filestream,&file_info.dosDate) != UNZ_OK)
-        err=UNZ_ERRNO;
-
-    unz64local_DosDateToTmuDate(file_info.dosDate,&file_info.tmu_date);
-
-    if (unz64local_getLong(&s->z_filefunc, s->filestream,&file_info.crc) != UNZ_OK)
-        err=UNZ_ERRNO;
-
-    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uL) != UNZ_OK)
-        err=UNZ_ERRNO;
-    file_info.compressed_size = uL;
-
-    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uL) != UNZ_OK)
-        err=UNZ_ERRNO;
-    file_info.uncompressed_size = uL;
-
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.size_filename) != UNZ_OK)
-        err=UNZ_ERRNO;
-
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.size_file_extra) != UNZ_OK)
-        err=UNZ_ERRNO;
-
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.size_file_comment) != UNZ_OK)
-        err=UNZ_ERRNO;
-
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.disk_num_start) != UNZ_OK)
-        err=UNZ_ERRNO;
-
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&file_info.internal_fa) != UNZ_OK)
-        err=UNZ_ERRNO;
-
-    if (unz64local_getLong(&s->z_filefunc, s->filestream,&file_info.external_fa) != UNZ_OK)
-        err=UNZ_ERRNO;
-
-                // relative offset of local header
-    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uL) != UNZ_OK)
-        err=UNZ_ERRNO;
-    file_info_internal.offset_curfile = uL;
-
-    lSeek+=file_info.size_filename;
-    if ((err==UNZ_OK) && (szFileName!=NULL))
-    {
-        uLong uSizeRead ;
-        if (file_info.size_filename<fileNameBufferSize)
-        {
-            *(szFileName+file_info.size_filename)='\0';
-            uSizeRead = file_info.size_filename;
-        }
-        else
-            uSizeRead = fileNameBufferSize;
-
-        if ((file_info.size_filename>0) && (fileNameBufferSize>0))
-            if (ZREAD64(s->z_filefunc, s->filestream,szFileName,uSizeRead)!=uSizeRead)
-                err=UNZ_ERRNO;
-        lSeek -= uSizeRead;
-    }
-
-    // Read extrafield
-    if ((err==UNZ_OK) && (extraField!=NULL))
-    {
-        ZPOS64_T uSizeRead ;
-        if (file_info.size_file_extra<extraFieldBufferSize)
-            uSizeRead = file_info.size_file_extra;
-        else
-            uSizeRead = extraFieldBufferSize;
-
-        if (lSeek!=0)
-        {
-            if (ZSEEK64(s->z_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0)
-                lSeek=0;
-            else
-                err=UNZ_ERRNO;
-        }
-
-        if ((file_info.size_file_extra>0) && (extraFieldBufferSize>0))
-            if (ZREAD64(s->z_filefunc, s->filestream,extraField,(uLong)uSizeRead)!=uSizeRead)
-                err=UNZ_ERRNO;
-
-        lSeek += file_info.size_file_extra - (uLong)uSizeRead;
-    }
-    else
-        lSeek += file_info.size_file_extra;
-
-
-    if ((err==UNZ_OK) && (file_info.size_file_extra != 0))
-    {
-                                uLong acc = 0;
-
-        // since lSeek now points to after the extra field we need to move back
-        lSeek -= file_info.size_file_extra;
-
-        if (lSeek!=0)
-        {
-            if (ZSEEK64(s->z_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0)
-                lSeek=0;
-            else
-                err=UNZ_ERRNO;
-        }
-
-        while(acc < file_info.size_file_extra)
-        {
-            uLong headerId;
-                                                uLong dataSize;
-
-            if (unz64local_getShort(&s->z_filefunc, s->filestream,&headerId) != UNZ_OK)
-                err=UNZ_ERRNO;
-
-            if (unz64local_getShort(&s->z_filefunc, s->filestream,&dataSize) != UNZ_OK)
-                err=UNZ_ERRNO;
-
-            /* ZIP64 extra fields */
-            if (headerId == 0x0001)
-            {
-                                                        uLong uL;
-
-                                                                if(file_info.uncompressed_size == MAXU32)
-                                                                {
-                                                                        if (unz64local_getLong64(&s->z_filefunc, s->filestream,&file_info.uncompressed_size) != UNZ_OK)
-                                                                                        err=UNZ_ERRNO;
-                                                                }
-
-                                                                if(file_info.compressed_size == MAXU32)
-                                                                {
-                                                                        if (unz64local_getLong64(&s->z_filefunc, s->filestream,&file_info.compressed_size) != UNZ_OK)
-                                                                                  err=UNZ_ERRNO;
-                                                                }
-
-                                                                if(file_info_internal.offset_curfile == MAXU32)
-                                                                {
-                                                                        /* Relative Header offset */
-                                                                        if (unz64local_getLong64(&s->z_filefunc, s->filestream,&file_info_internal.offset_curfile) != UNZ_OK)
-                                                                                err=UNZ_ERRNO;
-                                                                }
-
-                                                                if(file_info.disk_num_start == MAXU32)
-                                                                {
-                                                                        /* Disk Start Number */
-                                                                        if (unz64local_getLong(&s->z_filefunc, s->filestream,&uL) != UNZ_OK)
-                                                                                err=UNZ_ERRNO;
-                                                                }
-
-            }
-            else
-            {
-                if (ZSEEK64(s->z_filefunc, s->filestream,dataSize,ZLIB_FILEFUNC_SEEK_CUR)!=0)
-                    err=UNZ_ERRNO;
-            }
-
-            acc += 2 + 2 + dataSize;
-        }
-    }
-
-    if ((err==UNZ_OK) && (szComment!=NULL))
-    {
-        uLong uSizeRead ;
-        if (file_info.size_file_comment<commentBufferSize)
-        {
-            *(szComment+file_info.size_file_comment)='\0';
-            uSizeRead = file_info.size_file_comment;
-        }
-        else
-            uSizeRead = commentBufferSize;
-
-        if (lSeek!=0)
-        {
-            if (ZSEEK64(s->z_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0)
-                lSeek=0;
-            else
-                err=UNZ_ERRNO;
-        }
-
-        if ((file_info.size_file_comment>0) && (commentBufferSize>0))
-            if (ZREAD64(s->z_filefunc, s->filestream,szComment,uSizeRead)!=uSizeRead)
-                err=UNZ_ERRNO;
-        lSeek+=file_info.size_file_comment - uSizeRead;
-    }
-    else
-        lSeek+=file_info.size_file_comment;
-
-
-    if ((err==UNZ_OK) && (pfile_info!=NULL))
-        *pfile_info=file_info;
-
-    if ((err==UNZ_OK) && (pfile_info_internal!=NULL))
-        *pfile_info_internal=file_info_internal;
-
-    return err;
-}
-
-
-
-/*
-  Write info about the ZipFile in the *pglobal_info structure.
-  No preparation of the structure is needed
-  return UNZ_OK if there is no problem.
-*/
-extern int ZEXPORT unzGetCurrentFileInfo64 (unzFile file,
-                                          unz_file_info64 * pfile_info,
-                                          char * szFileName, uLong fileNameBufferSize,
-                                          void *extraField, uLong extraFieldBufferSize,
-                                          char* szComment,  uLong commentBufferSize)
-{
-    return unz64local_GetCurrentFileInfoInternal(file,pfile_info,NULL,
-                                                szFileName,fileNameBufferSize,
-                                                extraField,extraFieldBufferSize,
-                                                szComment,commentBufferSize);
-}
-
-extern int ZEXPORT unzGetCurrentFileInfo (unzFile file,
-                                          unz_file_info * pfile_info,
-                                          char * szFileName, uLong fileNameBufferSize,
-                                          void *extraField, uLong extraFieldBufferSize,
-                                          char* szComment,  uLong commentBufferSize)
-{
-    int err;
-    unz_file_info64 file_info64;
-    err = unz64local_GetCurrentFileInfoInternal(file,&file_info64,NULL,
-                                                szFileName,fileNameBufferSize,
-                                                extraField,extraFieldBufferSize,
-                                                szComment,commentBufferSize);
-    if ((err==UNZ_OK) && (pfile_info != NULL))
-    {
-        pfile_info->version = file_info64.version;
-        pfile_info->version_needed = file_info64.version_needed;
-        pfile_info->flag = file_info64.flag;
-        pfile_info->compression_method = file_info64.compression_method;
-        pfile_info->dosDate = file_info64.dosDate;
-        pfile_info->crc = file_info64.crc;
-
-        pfile_info->size_filename = file_info64.size_filename;
-        pfile_info->size_file_extra = file_info64.size_file_extra;
-        pfile_info->size_file_comment = file_info64.size_file_comment;
-
-        pfile_info->disk_num_start = file_info64.disk_num_start;
-        pfile_info->internal_fa = file_info64.internal_fa;
-        pfile_info->external_fa = file_info64.external_fa;
-
-        pfile_info->tmu_date = file_info64.tmu_date,
-
-
-        pfile_info->compressed_size = (uLong)file_info64.compressed_size;
-        pfile_info->uncompressed_size = (uLong)file_info64.uncompressed_size;
-
-    }
-    return err;
-}
-/*
-  Set the current file of the zipfile to the first file.
-  return UNZ_OK if there is no problem
-*/
-extern int ZEXPORT unzGoToFirstFile (unzFile file)
-{
-    int err=UNZ_OK;
-    unz64_s* s;
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-    s->pos_in_central_dir=s->offset_central_dir;
-    s->num_file=0;
-    err=unz64local_GetCurrentFileInfoInternal(file,&s->cur_file_info,
-                                             &s->cur_file_info_internal,
-                                             NULL,0,NULL,0,NULL,0);
-    s->current_file_ok = (err == UNZ_OK);
-    return err;
-}
-
-/*
-  Set the current file of the zipfile to the next file.
-  return UNZ_OK if there is no problem
-  return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest.
-*/
-extern int ZEXPORT unzGoToNextFile (unzFile  file)
-{
-    unz64_s* s;
-    int err;
-
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-    if (!s->current_file_ok)
-        return UNZ_END_OF_LIST_OF_FILE;
-    if (s->gi.number_entry != 0xffff)    /* 2^16 files overflow hack */
-      if (s->num_file+1==s->gi.number_entry)
-        return UNZ_END_OF_LIST_OF_FILE;
-
-    s->pos_in_central_dir += SIZECENTRALDIRITEM + s->cur_file_info.size_filename +
-            s->cur_file_info.size_file_extra + s->cur_file_info.size_file_comment ;
-    s->num_file++;
-    err = unz64local_GetCurrentFileInfoInternal(file,&s->cur_file_info,
-                                               &s->cur_file_info_internal,
-                                               NULL,0,NULL,0,NULL,0);
-    s->current_file_ok = (err == UNZ_OK);
-    return err;
-}
-
-
-/*
-  Try locate the file szFileName in the zipfile.
-  For the iCaseSensitivity signification, see unzStringFileNameCompare
-
-  return value :
-  UNZ_OK if the file is found. It becomes the current file.
-  UNZ_END_OF_LIST_OF_FILE if the file is not found
-*/
-extern int ZEXPORT unzLocateFile (unzFile file, const char *szFileName, int iCaseSensitivity)
-{
-    unz64_s* s;
-    int err;
-
-    /* We remember the 'current' position in the file so that we can jump
-     * back there if we fail.
-     */
-    unz_file_info64 cur_file_infoSaved;
-    unz_file_info64_internal cur_file_info_internalSaved;
-    ZPOS64_T num_fileSaved;
-    ZPOS64_T pos_in_central_dirSaved;
-
-
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-
-    if (strlen(szFileName)>=UNZ_MAXFILENAMEINZIP)
-        return UNZ_PARAMERROR;
-
-    s=(unz64_s*)file;
-    if (!s->current_file_ok)
-        return UNZ_END_OF_LIST_OF_FILE;
-
-    /* Save the current state */
-    num_fileSaved = s->num_file;
-    pos_in_central_dirSaved = s->pos_in_central_dir;
-    cur_file_infoSaved = s->cur_file_info;
-    cur_file_info_internalSaved = s->cur_file_info_internal;
-
-    err = unzGoToFirstFile(file);
-
-    while (err == UNZ_OK)
-    {
-        char szCurrentFileName[UNZ_MAXFILENAMEINZIP+1];
-        err = unzGetCurrentFileInfo64(file,NULL,
-                                    szCurrentFileName,sizeof(szCurrentFileName)-1,
-                                    NULL,0,NULL,0);
-        if (err == UNZ_OK)
-        {
-            if (unzStringFileNameCompare(szCurrentFileName,
-                                            szFileName,iCaseSensitivity)==0)
-                return UNZ_OK;
-            err = unzGoToNextFile(file);
-        }
-    }
-
-    /* We failed, so restore the state of the 'current file' to where we
-     * were.
-     */
-    s->num_file = num_fileSaved ;
-    s->pos_in_central_dir = pos_in_central_dirSaved ;
-    s->cur_file_info = cur_file_infoSaved;
-    s->cur_file_info_internal = cur_file_info_internalSaved;
-    return err;
-}
-
-
-/*
-///////////////////////////////////////////
-// Contributed by Ryan Haksi (mailto://cryogen@infoserve.net)
-// I need random access
-//
-// Further optimization could be realized by adding an ability
-// to cache the directory in memory. The goal being a single
-// comprehensive file read to put the file I need in a memory.
-*/
-
-/*
-typedef struct unz_file_pos_s
-{
-    ZPOS64_T pos_in_zip_directory;   // offset in file
-    ZPOS64_T num_of_file;            // # of file
-} unz_file_pos;
-*/
-
-extern int ZEXPORT unzGetFilePos64(unzFile file, unz64_file_pos*  file_pos)
-{
-    unz64_s* s;
-
-    if (file==NULL || file_pos==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-    if (!s->current_file_ok)
-        return UNZ_END_OF_LIST_OF_FILE;
-
-    file_pos->pos_in_zip_directory  = s->pos_in_central_dir;
-    file_pos->num_of_file           = s->num_file;
-
-    return UNZ_OK;
-}
-
-extern int ZEXPORT unzGetFilePos(
-    unzFile file,
-    unz_file_pos* file_pos)
-{
-    unz64_file_pos file_pos64;
-    int err = unzGetFilePos64(file,&file_pos64);
-    if (err==UNZ_OK)
-    {
-        file_pos->pos_in_zip_directory = (uLong)file_pos64.pos_in_zip_directory;
-        file_pos->num_of_file = (uLong)file_pos64.num_of_file;
-    }
-    return err;
-}
-
-extern int ZEXPORT unzGoToFilePos64(unzFile file, const unz64_file_pos* file_pos)
-{
-    unz64_s* s;
-    int err;
-
-    if (file==NULL || file_pos==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-
-    /* jump to the right spot */
-    s->pos_in_central_dir = file_pos->pos_in_zip_directory;
-    s->num_file           = file_pos->num_of_file;
-
-    /* set the current file */
-    err = unz64local_GetCurrentFileInfoInternal(file,&s->cur_file_info,
-                                               &s->cur_file_info_internal,
-                                               NULL,0,NULL,0,NULL,0);
-    /* return results */
-    s->current_file_ok = (err == UNZ_OK);
-    return err;
-}
-
-extern int ZEXPORT unzGoToFilePos(
-    unzFile file,
-    unz_file_pos* file_pos)
-{
-    unz64_file_pos file_pos64;
-    if (file_pos == NULL)
-        return UNZ_PARAMERROR;
-
-    file_pos64.pos_in_zip_directory = file_pos->pos_in_zip_directory;
-    file_pos64.num_of_file = file_pos->num_of_file;
-    return unzGoToFilePos64(file,&file_pos64);
-}
-
-/*
-// Unzip Helper Functions - should be here?
-///////////////////////////////////////////
-*/
-
-/*
-  Read the local header of the current zipfile
-  Check the coherency of the local header and info in the end of central
-        directory about this file
-  store in *piSizeVar the size of extra info in local header
-        (filename and size of extra field data)
-*/
-local int unz64local_CheckCurrentFileCoherencyHeader (unz64_s* s, uInt* piSizeVar,
-                                                    ZPOS64_T * poffset_local_extrafield,
-                                                    uInt  * psize_local_extrafield)
-{
-    uLong uMagic,uData,uFlags;
-    uLong size_filename;
-    uLong size_extra_field;
-    int err=UNZ_OK;
-
-    *piSizeVar = 0;
-    *poffset_local_extrafield = 0;
-    *psize_local_extrafield = 0;
-
-    if (ZSEEK64(s->z_filefunc, s->filestream,s->cur_file_info_internal.offset_curfile +
-                                s->byte_before_the_zipfile,ZLIB_FILEFUNC_SEEK_SET)!=0)
-        return UNZ_ERRNO;
-
-
-    if (err==UNZ_OK)
-    {
-        if (unz64local_getLong(&s->z_filefunc, s->filestream,&uMagic) != UNZ_OK)
-            err=UNZ_ERRNO;
-        else if (uMagic!=0x04034b50)
-            err=UNZ_BADZIPFILE;
-    }
-
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&uData) != UNZ_OK)
-        err=UNZ_ERRNO;
-/*
-    else if ((err==UNZ_OK) && (uData!=s->cur_file_info.wVersion))
-        err=UNZ_BADZIPFILE;
-*/
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&uFlags) != UNZ_OK)
-        err=UNZ_ERRNO;
-
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&uData) != UNZ_OK)
-        err=UNZ_ERRNO;
-    else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compression_method))
-        err=UNZ_BADZIPFILE;
-
-    if ((err==UNZ_OK) && (s->cur_file_info.compression_method!=0) &&
-/* #ifdef HAVE_BZIP2 */
-                         (s->cur_file_info.compression_method!=Z_BZIP2ED) &&
-/* #endif */
-                         (s->cur_file_info.compression_method!=Z_DEFLATED))
-        err=UNZ_BADZIPFILE;
-
-    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uData) != UNZ_OK) /* date/time */
-        err=UNZ_ERRNO;
-
-    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uData) != UNZ_OK) /* crc */
-        err=UNZ_ERRNO;
-    else if ((err==UNZ_OK) && (uData!=s->cur_file_info.crc) && ((uFlags & 8)==0))
-        err=UNZ_BADZIPFILE;
-
-    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uData) != UNZ_OK) /* size compr */
-        err=UNZ_ERRNO;
-    else if (uData != 0xFFFFFFFF && (err==UNZ_OK) && (uData!=s->cur_file_info.compressed_size) && ((uFlags & 8)==0))
-        err=UNZ_BADZIPFILE;
-
-    if (unz64local_getLong(&s->z_filefunc, s->filestream,&uData) != UNZ_OK) /* size uncompr */
-        err=UNZ_ERRNO;
-    else if (uData != 0xFFFFFFFF && (err==UNZ_OK) && (uData!=s->cur_file_info.uncompressed_size) && ((uFlags & 8)==0))
-        err=UNZ_BADZIPFILE;
-
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&size_filename) != UNZ_OK)
-        err=UNZ_ERRNO;
-    else if ((err==UNZ_OK) && (size_filename!=s->cur_file_info.size_filename))
-        err=UNZ_BADZIPFILE;
-
-    *piSizeVar += (uInt)size_filename;
-
-    if (unz64local_getShort(&s->z_filefunc, s->filestream,&size_extra_field) != UNZ_OK)
-        err=UNZ_ERRNO;
-    *poffset_local_extrafield= s->cur_file_info_internal.offset_curfile +
-                                    SIZEZIPLOCALHEADER + size_filename;
-    *psize_local_extrafield = (uInt)size_extra_field;
-
-    *piSizeVar += (uInt)size_extra_field;
-
-    return err;
-}
-
-/*
-  Open for reading data the current file in the zipfile.
-  If there is no error and the file is opened, the return value is UNZ_OK.
-*/
-extern int ZEXPORT unzOpenCurrentFile3 (unzFile file, int* method,
-                                            int* level, int raw, const char* password)
-{
-    int err=UNZ_OK;
-    uInt iSizeVar;
-    unz64_s* s;
-    file_in_zip64_read_info_s* pfile_in_zip_read_info;
-    ZPOS64_T offset_local_extrafield;  /* offset of the local extra field */
-    uInt  size_local_extrafield;    /* size of the local extra field */
-#    ifndef NOUNCRYPT
-    char source[12];
-#    else
-    if (password != NULL)
-        return UNZ_PARAMERROR;
-#    endif
-
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-    if (!s->current_file_ok)
-        return UNZ_PARAMERROR;
-
-    if (s->pfile_in_zip_read != NULL)
-        unzCloseCurrentFile(file);
-
-    if (unz64local_CheckCurrentFileCoherencyHeader(s,&iSizeVar, &offset_local_extrafield,&size_local_extrafield)!=UNZ_OK)
-        return UNZ_BADZIPFILE;
-
-    pfile_in_zip_read_info = (file_in_zip64_read_info_s*)ALLOC(sizeof(file_in_zip64_read_info_s));
-    if (pfile_in_zip_read_info==NULL)
-        return UNZ_INTERNALERROR;
-
-    pfile_in_zip_read_info->read_buffer=(char*)ALLOC(UNZ_BUFSIZE);
-    pfile_in_zip_read_info->offset_local_extrafield = offset_local_extrafield;
-    pfile_in_zip_read_info->size_local_extrafield = size_local_extrafield;
-    pfile_in_zip_read_info->pos_local_extrafield=0;
-    pfile_in_zip_read_info->raw=raw;
-
-    if (pfile_in_zip_read_info->read_buffer==NULL)
-    {
-        TRYFREE(pfile_in_zip_read_info);
-        return UNZ_INTERNALERROR;
-    }
-
-    pfile_in_zip_read_info->stream_initialised=0;
-
-    if (method!=NULL)
-        *method = (int)s->cur_file_info.compression_method;
-
-    if (level!=NULL)
-    {
-        *level = 6;
-        switch (s->cur_file_info.flag & 0x06)
-        {
-          case 6 : *level = 1; break;
-          case 4 : *level = 2; break;
-          case 2 : *level = 9; break;
-        }
-    }
-
-    if ((s->cur_file_info.compression_method!=0) &&
-/* #ifdef HAVE_BZIP2 */
-        (s->cur_file_info.compression_method!=Z_BZIP2ED) &&
-/* #endif */
-        (s->cur_file_info.compression_method!=Z_DEFLATED))
-
-        err=UNZ_BADZIPFILE;
-
-    pfile_in_zip_read_info->crc32_wait=s->cur_file_info.crc;
-    pfile_in_zip_read_info->crc32=0;
-    pfile_in_zip_read_info->total_out_64=0;
-    pfile_in_zip_read_info->compression_method = s->cur_file_info.compression_method;
-    pfile_in_zip_read_info->filestream=s->filestream;
-    pfile_in_zip_read_info->z_filefunc=s->z_filefunc;
-    pfile_in_zip_read_info->byte_before_the_zipfile=s->byte_before_the_zipfile;
-
-    pfile_in_zip_read_info->stream.total_out = 0;
-
-    if ((s->cur_file_info.compression_method==Z_BZIP2ED) && (!raw))
-    {
-#ifdef HAVE_BZIP2
-      pfile_in_zip_read_info->bstream.bzalloc = (void *(*) (void *, int, int))0;
-      pfile_in_zip_read_info->bstream.bzfree = (free_func)0;
-      pfile_in_zip_read_info->bstream.opaque = (voidpf)0;
-      pfile_in_zip_read_info->bstream.state = (voidpf)0;
-
-      pfile_in_zip_read_info->stream.zalloc = (alloc_func)0;
-      pfile_in_zip_read_info->stream.zfree = (free_func)0;
-      pfile_in_zip_read_info->stream.opaque = (voidpf)0;
-      pfile_in_zip_read_info->stream.next_in = (voidpf)0;
-      pfile_in_zip_read_info->stream.avail_in = 0;
-
-      err=BZ2_bzDecompressInit(&pfile_in_zip_read_info->bstream, 0, 0);
-      if (err == Z_OK)
-        pfile_in_zip_read_info->stream_initialised=Z_BZIP2ED;
-      else
-      {
-        TRYFREE(pfile_in_zip_read_info);
-        return err;
-      }
-#else
-      pfile_in_zip_read_info->raw=1;
-#endif
-    }
-    else if ((s->cur_file_info.compression_method==Z_DEFLATED) && (!raw))
-    {
-      pfile_in_zip_read_info->stream.zalloc = (alloc_func)0;
-      pfile_in_zip_read_info->stream.zfree = (free_func)0;
-      pfile_in_zip_read_info->stream.opaque = (voidpf)0;
-      pfile_in_zip_read_info->stream.next_in = 0;
-      pfile_in_zip_read_info->stream.avail_in = 0;
-
-      err=inflateInit2(&pfile_in_zip_read_info->stream, -MAX_WBITS);
-      if (err == Z_OK)
-        pfile_in_zip_read_info->stream_initialised=Z_DEFLATED;
-      else
-      {
-        TRYFREE(pfile_in_zip_read_info);
-        return err;
-      }
-        /* windowBits is passed < 0 to tell that there is no zlib header.
-         * Note that in this case inflate *requires* an extra "dummy" byte
-         * after the compressed stream in order to complete decompression and
-         * return Z_STREAM_END.
-         * In unzip, i don't wait absolutely Z_STREAM_END because I known the
-         * size of both compressed and uncompressed data
-         */
-    }
-    pfile_in_zip_read_info->rest_read_compressed =
-            s->cur_file_info.compressed_size ;
-    pfile_in_zip_read_info->rest_read_uncompressed =
-            s->cur_file_info.uncompressed_size ;
-
-
-    pfile_in_zip_read_info->pos_in_zipfile =
-            s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER +
-              iSizeVar;
-
-    pfile_in_zip_read_info->stream.avail_in = (uInt)0;
-
-    s->pfile_in_zip_read = pfile_in_zip_read_info;
-                s->encrypted = 0;
-
-#    ifndef NOUNCRYPT
-    if (password != NULL)
-    {
-        int i;
-        s->pcrc_32_tab = get_crc_table();
-        init_keys(password,s->keys,s->pcrc_32_tab);
-        if (ZSEEK64(s->z_filefunc, s->filestream,
-                  s->pfile_in_zip_read->pos_in_zipfile +
-                     s->pfile_in_zip_read->byte_before_the_zipfile,
-                  SEEK_SET)!=0)
-            return UNZ_INTERNALERROR;
-        if(ZREAD64(s->z_filefunc, s->filestream,source, 12)<12)
-            return UNZ_INTERNALERROR;
-
-        for (i = 0; i<12; i++)
-            zdecode(s->keys,s->pcrc_32_tab,source[i]);
-
-        s->pfile_in_zip_read->pos_in_zipfile+=12;
-        s->encrypted=1;
-    }
-#    endif
-
-
-    return UNZ_OK;
-}
-
-extern int ZEXPORT unzOpenCurrentFile (unzFile file)
-{
-    return unzOpenCurrentFile3(file, NULL, NULL, 0, NULL);
-}
-
-extern int ZEXPORT unzOpenCurrentFilePassword (unzFile file, const char*  password)
-{
-    return unzOpenCurrentFile3(file, NULL, NULL, 0, password);
-}
-
-extern int ZEXPORT unzOpenCurrentFile2 (unzFile file, int* method, int* level, int raw)
-{
-    return unzOpenCurrentFile3(file, method, level, raw, NULL);
-}
-
-/** Addition for GDAL : START */
-
-extern ZPOS64_T ZEXPORT unzGetCurrentFileZStreamPos64( unzFile file)
-{
-    unz64_s* s;
-    file_in_zip64_read_info_s* pfile_in_zip_read_info;
-    s=(unz64_s*)file;
-    if (file==NULL)
-        return 0; //UNZ_PARAMERROR;
-    pfile_in_zip_read_info=s->pfile_in_zip_read;
-    if (pfile_in_zip_read_info==NULL)
-        return 0; //UNZ_PARAMERROR;
-    return pfile_in_zip_read_info->pos_in_zipfile +
-                         pfile_in_zip_read_info->byte_before_the_zipfile;
-}
-
-/** Addition for GDAL : END */
-
-/*
-  Read bytes from the current file.
-  buf contain buffer where data must be copied
-  len the size of buf.
-
-  return the number of byte copied if somes bytes are copied
-  return 0 if the end of file was reached
-  return <0 with error code if there is an error
-    (UNZ_ERRNO for IO error, or zLib error for uncompress error)
-*/
-extern int ZEXPORT unzReadCurrentFile  (unzFile file, voidp buf, unsigned len)
-{
-    int err=UNZ_OK;
-    uInt iRead = 0;
-    unz64_s* s;
-    file_in_zip64_read_info_s* pfile_in_zip_read_info;
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-    pfile_in_zip_read_info=s->pfile_in_zip_read;
-
-    if (pfile_in_zip_read_info==NULL)
-        return UNZ_PARAMERROR;
-
-
-    if (pfile_in_zip_read_info->read_buffer == NULL)
-        return UNZ_END_OF_LIST_OF_FILE;
-    if (len==0)
-        return 0;
-
-    pfile_in_zip_read_info->stream.next_out = (Bytef*)buf;
-
-    pfile_in_zip_read_info->stream.avail_out = (uInt)len;
-
-    if ((len>pfile_in_zip_read_info->rest_read_uncompressed) &&
-        (!(pfile_in_zip_read_info->raw)))
-        pfile_in_zip_read_info->stream.avail_out =
-            (uInt)pfile_in_zip_read_info->rest_read_uncompressed;
-
-    if ((len>pfile_in_zip_read_info->rest_read_compressed+
-           pfile_in_zip_read_info->stream.avail_in) &&
-         (pfile_in_zip_read_info->raw))
-        pfile_in_zip_read_info->stream.avail_out =
-            (uInt)pfile_in_zip_read_info->rest_read_compressed+
-            pfile_in_zip_read_info->stream.avail_in;
-
-    while (pfile_in_zip_read_info->stream.avail_out>0)
-    {
-        if ((pfile_in_zip_read_info->stream.avail_in==0) &&
-            (pfile_in_zip_read_info->rest_read_compressed>0))
-        {
-            uInt uReadThis = UNZ_BUFSIZE;
-            if (pfile_in_zip_read_info->rest_read_compressed<uReadThis)
-                uReadThis = (uInt)pfile_in_zip_read_info->rest_read_compressed;
-            if (uReadThis == 0)
-                return UNZ_EOF;
-            if (ZSEEK64(pfile_in_zip_read_info->z_filefunc,
-                      pfile_in_zip_read_info->filestream,
-                      pfile_in_zip_read_info->pos_in_zipfile +
-                         pfile_in_zip_read_info->byte_before_the_zipfile,
-                         ZLIB_FILEFUNC_SEEK_SET)!=0)
-                return UNZ_ERRNO;
-            if (ZREAD64(pfile_in_zip_read_info->z_filefunc,
-                      pfile_in_zip_read_info->filestream,
-                      pfile_in_zip_read_info->read_buffer,
-                      uReadThis)!=uReadThis)
-                return UNZ_ERRNO;
-
-
-#            ifndef NOUNCRYPT
-            if(s->encrypted)
-            {
-                uInt i;
-                for(i=0;i<uReadThis;i++)
-                  pfile_in_zip_read_info->read_buffer[i] =
-                      zdecode(s->keys,s->pcrc_32_tab,
-                              pfile_in_zip_read_info->read_buffer[i]);
-            }
-#            endif
-
-
-            pfile_in_zip_read_info->pos_in_zipfile += uReadThis;
-
-            pfile_in_zip_read_info->rest_read_compressed-=uReadThis;
-
-            pfile_in_zip_read_info->stream.next_in =
-                (Bytef*)pfile_in_zip_read_info->read_buffer;
-            pfile_in_zip_read_info->stream.avail_in = (uInt)uReadThis;
-        }
-
-        if ((pfile_in_zip_read_info->compression_method==0) || (pfile_in_zip_read_info->raw))
-        {
-            uInt uDoCopy,i ;
-
-            if ((pfile_in_zip_read_info->stream.avail_in == 0) &&
-                (pfile_in_zip_read_info->rest_read_compressed == 0))
-                return (iRead==0) ? UNZ_EOF : iRead;
-
-            if (pfile_in_zip_read_info->stream.avail_out <
-                            pfile_in_zip_read_info->stream.avail_in)
-                uDoCopy = pfile_in_zip_read_info->stream.avail_out ;
-            else
-                uDoCopy = pfile_in_zip_read_info->stream.avail_in ;
-
-            for (i=0;i<uDoCopy;i++)
-                *(pfile_in_zip_read_info->stream.next_out+i) =
-                        *(pfile_in_zip_read_info->stream.next_in+i);
-
-            pfile_in_zip_read_info->total_out_64 = pfile_in_zip_read_info->total_out_64 + uDoCopy;
-
-            pfile_in_zip_read_info->crc32 = crc32(pfile_in_zip_read_info->crc32,
-                                pfile_in_zip_read_info->stream.next_out,
-                                uDoCopy);
-            pfile_in_zip_read_info->rest_read_uncompressed-=uDoCopy;
-            pfile_in_zip_read_info->stream.avail_in -= uDoCopy;
-            pfile_in_zip_read_info->stream.avail_out -= uDoCopy;
-            pfile_in_zip_read_info->stream.next_out += uDoCopy;
-            pfile_in_zip_read_info->stream.next_in += uDoCopy;
-            pfile_in_zip_read_info->stream.total_out += uDoCopy;
-            iRead += uDoCopy;
-        }
-        else if (pfile_in_zip_read_info->compression_method==Z_BZIP2ED)
-        {
-#ifdef HAVE_BZIP2
-            uLong uTotalOutBefore,uTotalOutAfter;
-            const Bytef *bufBefore;
-            uLong uOutThis;
-
-            pfile_in_zip_read_info->bstream.next_in        = (char*)pfile_in_zip_read_info->stream.next_in;
-            pfile_in_zip_read_info->bstream.avail_in       = pfile_in_zip_read_info->stream.avail_in;
-            pfile_in_zip_read_info->bstream.total_in_lo32  = pfile_in_zip_read_info->stream.total_in;
-            pfile_in_zip_read_info->bstream.total_in_hi32  = 0;
-            pfile_in_zip_read_info->bstream.next_out       = (char*)pfile_in_zip_read_info->stream.next_out;
-            pfile_in_zip_read_info->bstream.avail_out      = pfile_in_zip_read_info->stream.avail_out;
-            pfile_in_zip_read_info->bstream.total_out_lo32 = pfile_in_zip_read_info->stream.total_out;
-            pfile_in_zip_read_info->bstream.total_out_hi32 = 0;
-
-            uTotalOutBefore = pfile_in_zip_read_info->bstream.total_out_lo32;
-            bufBefore = (const Bytef *)pfile_in_zip_read_info->bstream.next_out;
-
-            err=BZ2_bzDecompress(&pfile_in_zip_read_info->bstream);
-
-            uTotalOutAfter = pfile_in_zip_read_info->bstream.total_out_lo32;
-            uOutThis = uTotalOutAfter-uTotalOutBefore;
-
-            pfile_in_zip_read_info->total_out_64 = pfile_in_zip_read_info->total_out_64 + uOutThis;
-
-            pfile_in_zip_read_info->crc32 = crc32(pfile_in_zip_read_info->crc32,bufBefore, (uInt)(uOutThis));
-            pfile_in_zip_read_info->rest_read_uncompressed -= uOutThis;
-            iRead += (uInt)(uTotalOutAfter - uTotalOutBefore);
-
-            pfile_in_zip_read_info->stream.next_in   = (Bytef*)pfile_in_zip_read_info->bstream.next_in;
-            pfile_in_zip_read_info->stream.avail_in  = pfile_in_zip_read_info->bstream.avail_in;
-            pfile_in_zip_read_info->stream.total_in  = pfile_in_zip_read_info->bstream.total_in_lo32;
-            pfile_in_zip_read_info->stream.next_out  = (Bytef*)pfile_in_zip_read_info->bstream.next_out;
-            pfile_in_zip_read_info->stream.avail_out = pfile_in_zip_read_info->bstream.avail_out;
-            pfile_in_zip_read_info->stream.total_out = pfile_in_zip_read_info->bstream.total_out_lo32;
-
-            if (err==BZ_STREAM_END)
-              return (iRead==0) ? UNZ_EOF : iRead;
-            if (err!=BZ_OK)
-              break;
-#endif
-        } // end Z_BZIP2ED
-        else
-        {
-            ZPOS64_T uTotalOutBefore,uTotalOutAfter;
-            const Bytef *bufBefore;
-            ZPOS64_T uOutThis;
-            int flush=Z_SYNC_FLUSH;
-
-            uTotalOutBefore = pfile_in_zip_read_info->stream.total_out;
-            bufBefore = pfile_in_zip_read_info->stream.next_out;
-
-            /*
-            if ((pfile_in_zip_read_info->rest_read_uncompressed ==
-                     pfile_in_zip_read_info->stream.avail_out) &&
-                (pfile_in_zip_read_info->rest_read_compressed == 0))
-                flush = Z_FINISH;
-            */
-            err=inflate(&pfile_in_zip_read_info->stream,flush);
-
-            if ((err>=0) && (pfile_in_zip_read_info->stream.msg!=NULL))
-              err = Z_DATA_ERROR;
-
-            uTotalOutAfter = pfile_in_zip_read_info->stream.total_out;
-            uOutThis = uTotalOutAfter-uTotalOutBefore;
-
-            pfile_in_zip_read_info->total_out_64 = pfile_in_zip_read_info->total_out_64 + uOutThis;
-
-            pfile_in_zip_read_info->crc32 =
-                crc32(pfile_in_zip_read_info->crc32,bufBefore,
-                        (uInt)(uOutThis));
-
-            pfile_in_zip_read_info->rest_read_uncompressed -=
-                uOutThis;
-
-            iRead += (uInt)(uTotalOutAfter - uTotalOutBefore);
-
-            if (err==Z_STREAM_END)
-                return (iRead==0) ? UNZ_EOF : iRead;
-            if (err!=Z_OK)
-                break;
-        }
-    }
-
-    if (err==Z_OK)
-        return iRead;
-    return err;
-}
-
-
-/*
-  Give the current position in uncompressed data
-*/
-extern z_off_t ZEXPORT unztell (unzFile file)
-{
-    unz64_s* s;
-    file_in_zip64_read_info_s* pfile_in_zip_read_info;
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-    pfile_in_zip_read_info=s->pfile_in_zip_read;
-
-    if (pfile_in_zip_read_info==NULL)
-        return UNZ_PARAMERROR;
-
-    return (z_off_t)pfile_in_zip_read_info->stream.total_out;
-}
-
-extern ZPOS64_T ZEXPORT unztell64 (unzFile file)
-{
-
-    unz64_s* s;
-    file_in_zip64_read_info_s* pfile_in_zip_read_info;
-    if (file==NULL)
-        return (ZPOS64_T)-1;
-    s=(unz64_s*)file;
-    pfile_in_zip_read_info=s->pfile_in_zip_read;
-
-    if (pfile_in_zip_read_info==NULL)
-        return (ZPOS64_T)-1;
-
-    return pfile_in_zip_read_info->total_out_64;
-}
-
-
-/*
-  return 1 if the end of file was reached, 0 elsewhere
-*/
-extern int ZEXPORT unzeof (unzFile file)
-{
-    unz64_s* s;
-    file_in_zip64_read_info_s* pfile_in_zip_read_info;
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-    pfile_in_zip_read_info=s->pfile_in_zip_read;
-
-    if (pfile_in_zip_read_info==NULL)
-        return UNZ_PARAMERROR;
-
-    if (pfile_in_zip_read_info->rest_read_uncompressed == 0)
-        return 1;
-    else
-        return 0;
-}
-
-
-
-/*
-Read extra field from the current file (opened by unzOpenCurrentFile)
-This is the local-header version of the extra field (sometimes, there is
-more info in the local-header version than in the central-header)
-
-  if buf==NULL, it return the size of the local extra field that can be read
-
-  if buf!=NULL, len is the size of the buffer, the extra header is copied in
-    buf.
-  the return value is the number of bytes copied in buf, or (if <0)
-    the error code
-*/
-extern int ZEXPORT unzGetLocalExtrafield (unzFile file, voidp buf, unsigned len)
-{
-    unz64_s* s;
-    file_in_zip64_read_info_s* pfile_in_zip_read_info;
-    uInt read_now;
-    ZPOS64_T size_to_read;
-
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-    pfile_in_zip_read_info=s->pfile_in_zip_read;
-
-    if (pfile_in_zip_read_info==NULL)
-        return UNZ_PARAMERROR;
-
-    size_to_read = (pfile_in_zip_read_info->size_local_extrafield -
-                pfile_in_zip_read_info->pos_local_extrafield);
-
-    if (buf==NULL)
-        return (int)size_to_read;
-
-    if (len>size_to_read)
-        read_now = (uInt)size_to_read;
-    else
-        read_now = (uInt)len ;
-
-    if (read_now==0)
-        return 0;
-
-    if (ZSEEK64(pfile_in_zip_read_info->z_filefunc,
-              pfile_in_zip_read_info->filestream,
-              pfile_in_zip_read_info->offset_local_extrafield +
-              pfile_in_zip_read_info->pos_local_extrafield,
-              ZLIB_FILEFUNC_SEEK_SET)!=0)
-        return UNZ_ERRNO;
-
-    if (ZREAD64(pfile_in_zip_read_info->z_filefunc,
-              pfile_in_zip_read_info->filestream,
-              buf,read_now)!=read_now)
-        return UNZ_ERRNO;
-
-    return (int)read_now;
-}
-
-/*
-  Close the file in zip opened with unzOpenCurrentFile
-  Return UNZ_CRCERROR if all the file was read but the CRC is not good
-*/
-extern int ZEXPORT unzCloseCurrentFile (unzFile file)
-{
-    int err=UNZ_OK;
-
-    unz64_s* s;
-    file_in_zip64_read_info_s* pfile_in_zip_read_info;
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-    pfile_in_zip_read_info=s->pfile_in_zip_read;
-
-    if (pfile_in_zip_read_info==NULL)
-        return UNZ_PARAMERROR;
-
-
-    if ((pfile_in_zip_read_info->rest_read_uncompressed == 0) &&
-        (!pfile_in_zip_read_info->raw))
-    {
-        if (pfile_in_zip_read_info->crc32 != pfile_in_zip_read_info->crc32_wait)
-            err=UNZ_CRCERROR;
-    }
-
-
-    TRYFREE(pfile_in_zip_read_info->read_buffer);
-    pfile_in_zip_read_info->read_buffer = NULL;
-    if (pfile_in_zip_read_info->stream_initialised == Z_DEFLATED)
-        inflateEnd(&pfile_in_zip_read_info->stream);
-#ifdef HAVE_BZIP2
-    else if (pfile_in_zip_read_info->stream_initialised == Z_BZIP2ED)
-        BZ2_bzDecompressEnd(&pfile_in_zip_read_info->bstream);
-#endif
-
-
-    pfile_in_zip_read_info->stream_initialised = 0;
-    TRYFREE(pfile_in_zip_read_info);
-
-    s->pfile_in_zip_read=NULL;
-
-    return err;
-}
-
-
-/*
-  Get the global comment string of the ZipFile, in the szComment buffer.
-  uSizeBuf is the size of the szComment buffer.
-  return the number of byte copied or an error code <0
-*/
-extern int ZEXPORT unzGetGlobalComment (unzFile file, char * szComment, uLong uSizeBuf)
-{
-    unz64_s* s;
-    uLong uReadThis ;
-    if (file==NULL)
-        return (int)UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-
-    uReadThis = uSizeBuf;
-    if (uReadThis>s->gi.size_comment)
-        uReadThis = s->gi.size_comment;
-
-    if (ZSEEK64(s->z_filefunc,s->filestream,s->central_pos+22,ZLIB_FILEFUNC_SEEK_SET)!=0)
-        return UNZ_ERRNO;
-
-    if (uReadThis>0)
-    {
-      *szComment='\0';
-      if (ZREAD64(s->z_filefunc,s->filestream,szComment,uReadThis)!=uReadThis)
-        return UNZ_ERRNO;
-    }
-
-    if ((szComment != NULL) && (uSizeBuf > s->gi.size_comment))
-        *(szComment+s->gi.size_comment)='\0';
-    return (int)uReadThis;
-}
-
-/* Additions by RX '2004 */
-extern ZPOS64_T ZEXPORT unzGetOffset64(unzFile file)
-{
-    unz64_s* s;
-
-    if (file==NULL)
-          return 0; //UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-    if (!s->current_file_ok)
-      return 0;
-    if (s->gi.number_entry != 0 && s->gi.number_entry != 0xffff)
-      if (s->num_file==s->gi.number_entry)
-         return 0;
-    return s->pos_in_central_dir;
-}
-
-extern uLong ZEXPORT unzGetOffset (unzFile file)
-{
-    ZPOS64_T offset64;
-
-    if (file==NULL)
-          return 0; //UNZ_PARAMERROR;
-    offset64 = unzGetOffset64(file);
-    return (uLong)offset64;
-}
-
-extern int ZEXPORT unzSetOffset64(unzFile file, ZPOS64_T pos)
-{
-    unz64_s* s;
-    int err;
-
-    if (file==NULL)
-        return UNZ_PARAMERROR;
-    s=(unz64_s*)file;
-
-    s->pos_in_central_dir = pos;
-    s->num_file = s->gi.number_entry;      /* hack */
-    err = unz64local_GetCurrentFileInfoInternal(file,&s->cur_file_info,
-                                              &s->cur_file_info_internal,
-                                              NULL,0,NULL,0,NULL,0);
-    s->current_file_ok = (err == UNZ_OK);
-    return err;
-}
-
-extern int ZEXPORT unzSetOffset (unzFile file, uLong pos)
-{
-    return unzSetOffset64(file,pos);
-}
diff --git a/src/png/zlib/contrib/minizip/unzip.h b/src/png/zlib/contrib/minizip/unzip.h
deleted file mode 100644
index 2104e3915..000000000
--- a/src/png/zlib/contrib/minizip/unzip.h
+++ /dev/null
@@ -1,437 +0,0 @@
-/* unzip.h -- IO for uncompress .zip files using zlib
-   Version 1.1, February 14h, 2010
-   part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Modifications of Unzip for Zip64
-         Copyright (C) 2007-2008 Even Rouault
-
-         Modifications for Zip64 support on both zip and unzip
-         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
-
-         For more info read MiniZip_info.txt
-
-         ---------------------------------------------------------------------------------
-
-        Condition of use and distribution are the same than zlib :
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the authors be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-
-  ---------------------------------------------------------------------------------
-
-        Changes
-
-        See header of unzip64.c
-
-*/
-
-#ifndef _unz64_H
-#define _unz64_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifndef _ZLIB_H
-#include "zlib.h"
-#endif
-
-#ifndef  _ZLIBIOAPI_H
-#include "ioapi.h"
-#endif
-
-#ifdef HAVE_BZIP2
-#include "bzlib.h"
-#endif
-
-#define Z_BZIP2ED 12
-
-#if defined(STRICTUNZIP) || defined(STRICTZIPUNZIP)
-/* like the STRICT of WIN32, we define a pointer that cannot be converted
-    from (void*) without cast */
-typedef struct TagunzFile__ { int unused; } unzFile__;
-typedef unzFile__ *unzFile;
-#else
-typedef voidp unzFile;
-#endif
-
-
-#define UNZ_OK                          (0)
-#define UNZ_END_OF_LIST_OF_FILE         (-100)
-#define UNZ_ERRNO                       (Z_ERRNO)
-#define UNZ_EOF                         (0)
-#define UNZ_PARAMERROR                  (-102)
-#define UNZ_BADZIPFILE                  (-103)
-#define UNZ_INTERNALERROR               (-104)
-#define UNZ_CRCERROR                    (-105)
-
-/* tm_unz contain date/time info */
-typedef struct tm_unz_s
-{
-    uInt tm_sec;            /* seconds after the minute - [0,59] */
-    uInt tm_min;            /* minutes after the hour - [0,59] */
-    uInt tm_hour;           /* hours since midnight - [0,23] */
-    uInt tm_mday;           /* day of the month - [1,31] */
-    uInt tm_mon;            /* months since January - [0,11] */
-    uInt tm_year;           /* years - [1980..2044] */
-} tm_unz;
-
-/* unz_global_info structure contain global data about the ZIPfile
-   These data comes from the end of central dir */
-typedef struct unz_global_info64_s
-{
-    ZPOS64_T number_entry;         /* total number of entries in
-                                     the central dir on this disk */
-    uLong size_comment;         /* size of the global comment of the zipfile */
-} unz_global_info64;
-
-typedef struct unz_global_info_s
-{
-    uLong number_entry;         /* total number of entries in
-                                     the central dir on this disk */
-    uLong size_comment;         /* size of the global comment of the zipfile */
-} unz_global_info;
-
-/* unz_file_info contain information about a file in the zipfile */
-typedef struct unz_file_info64_s
-{
-    uLong version;              /* version made by                 2 bytes */
-    uLong version_needed;       /* version needed to extract       2 bytes */
-    uLong flag;                 /* general purpose bit flag        2 bytes */
-    uLong compression_method;   /* compression method              2 bytes */
-    uLong dosDate;              /* last mod file date in Dos fmt   4 bytes */
-    uLong crc;                  /* crc-32                          4 bytes */
-    ZPOS64_T compressed_size;   /* compressed size                 8 bytes */
-    ZPOS64_T uncompressed_size; /* uncompressed size               8 bytes */
-    uLong size_filename;        /* filename length                 2 bytes */
-    uLong size_file_extra;      /* extra field length              2 bytes */
-    uLong size_file_comment;    /* file comment length             2 bytes */
-
-    uLong disk_num_start;       /* disk number start               2 bytes */
-    uLong internal_fa;          /* internal file attributes        2 bytes */
-    uLong external_fa;          /* external file attributes        4 bytes */
-
-    tm_unz tmu_date;
-} unz_file_info64;
-
-typedef struct unz_file_info_s
-{
-    uLong version;              /* version made by                 2 bytes */
-    uLong version_needed;       /* version needed to extract       2 bytes */
-    uLong flag;                 /* general purpose bit flag        2 bytes */
-    uLong compression_method;   /* compression method              2 bytes */
-    uLong dosDate;              /* last mod file date in Dos fmt   4 bytes */
-    uLong crc;                  /* crc-32                          4 bytes */
-    uLong compressed_size;      /* compressed size                 4 bytes */
-    uLong uncompressed_size;    /* uncompressed size               4 bytes */
-    uLong size_filename;        /* filename length                 2 bytes */
-    uLong size_file_extra;      /* extra field length              2 bytes */
-    uLong size_file_comment;    /* file comment length             2 bytes */
-
-    uLong disk_num_start;       /* disk number start               2 bytes */
-    uLong internal_fa;          /* internal file attributes        2 bytes */
-    uLong external_fa;          /* external file attributes        4 bytes */
-
-    tm_unz tmu_date;
-} unz_file_info;
-
-extern int ZEXPORT unzStringFileNameCompare OF ((const char* fileName1,
-                                                 const char* fileName2,
-                                                 int iCaseSensitivity));
-/*
-   Compare two filename (fileName1,fileName2).
-   If iCaseSenisivity = 1, comparision is case sensitivity (like strcmp)
-   If iCaseSenisivity = 2, comparision is not case sensitivity (like strcmpi
-                                or strcasecmp)
-   If iCaseSenisivity = 0, case sensitivity is defaut of your operating system
-    (like 1 on Unix, 2 on Windows)
-*/
-
-
-extern unzFile ZEXPORT unzOpen OF((const char *path));
-extern unzFile ZEXPORT unzOpen64 OF((const void *path));
-/*
-  Open a Zip file. path contain the full pathname (by example,
-     on a Windows XP computer "c:\\zlib\\zlib113.zip" or on an Unix computer
-     "zlib/zlib113.zip".
-     If the zipfile cannot be opened (file don't exist or in not valid), the
-       return value is NULL.
-     Else, the return value is a unzFile Handle, usable with other function
-       of this unzip package.
-     the "64" function take a const void* pointer, because the path is just the
-       value passed to the open64_file_func callback.
-     Under Windows, if UNICODE is defined, using fill_fopen64_filefunc, the path
-       is a pointer to a wide unicode string (LPCTSTR is LPCWSTR), so const char*
-       does not describe the reality
-*/
-
-
-extern unzFile ZEXPORT unzOpen2 OF((const char *path,
-                                    zlib_filefunc_def* pzlib_filefunc_def));
-/*
-   Open a Zip file, like unzOpen, but provide a set of file low level API
-      for read/write the zip file (see ioapi.h)
-*/
-
-extern unzFile ZEXPORT unzOpen2_64 OF((const void *path,
-                                    zlib_filefunc64_def* pzlib_filefunc_def));
-/*
-   Open a Zip file, like unz64Open, but provide a set of file low level API
-      for read/write the zip file (see ioapi.h)
-*/
-
-extern int ZEXPORT unzClose OF((unzFile file));
-/*
-  Close a ZipFile opened with unzOpen.
-  If there is files inside the .Zip opened with unzOpenCurrentFile (see later),
-    these files MUST be closed with unzCloseCurrentFile before call unzClose.
-  return UNZ_OK if there is no problem. */
-
-extern int ZEXPORT unzGetGlobalInfo OF((unzFile file,
-                                        unz_global_info *pglobal_info));
-
-extern int ZEXPORT unzGetGlobalInfo64 OF((unzFile file,
-                                        unz_global_info64 *pglobal_info));
-/*
-  Write info about the ZipFile in the *pglobal_info structure.
-  No preparation of the structure is needed
-  return UNZ_OK if there is no problem. */
-
-
-extern int ZEXPORT unzGetGlobalComment OF((unzFile file,
-                                           char *szComment,
-                                           uLong uSizeBuf));
-/*
-  Get the global comment string of the ZipFile, in the szComment buffer.
-  uSizeBuf is the size of the szComment buffer.
-  return the number of byte copied or an error code <0
-*/
-
-
-/***************************************************************************/
-/* Unzip package allow you browse the directory of the zipfile */
-
-extern int ZEXPORT unzGoToFirstFile OF((unzFile file));
-/*
-  Set the current file of the zipfile to the first file.
-  return UNZ_OK if there is no problem
-*/
-
-extern int ZEXPORT unzGoToNextFile OF((unzFile file));
-/*
-  Set the current file of the zipfile to the next file.
-  return UNZ_OK if there is no problem
-  return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest.
-*/
-
-extern int ZEXPORT unzLocateFile OF((unzFile file,
-                     const char *szFileName,
-                     int iCaseSensitivity));
-/*
-  Try locate the file szFileName in the zipfile.
-  For the iCaseSensitivity signification, see unzStringFileNameCompare
-
-  return value :
-  UNZ_OK if the file is found. It becomes the current file.
-  UNZ_END_OF_LIST_OF_FILE if the file is not found
-*/
-
-
-/* ****************************************** */
-/* Ryan supplied functions */
-/* unz_file_info contain information about a file in the zipfile */
-typedef struct unz_file_pos_s
-{
-    uLong pos_in_zip_directory;   /* offset in zip file directory */
-    uLong num_of_file;            /* # of file */
-} unz_file_pos;
-
-extern int ZEXPORT unzGetFilePos(
-    unzFile file,
-    unz_file_pos* file_pos);
-
-extern int ZEXPORT unzGoToFilePos(
-    unzFile file,
-    unz_file_pos* file_pos);
-
-typedef struct unz64_file_pos_s
-{
-    ZPOS64_T pos_in_zip_directory;   /* offset in zip file directory */
-    ZPOS64_T num_of_file;            /* # of file */
-} unz64_file_pos;
-
-extern int ZEXPORT unzGetFilePos64(
-    unzFile file,
-    unz64_file_pos* file_pos);
-
-extern int ZEXPORT unzGoToFilePos64(
-    unzFile file,
-    const unz64_file_pos* file_pos);
-
-/* ****************************************** */
-
-extern int ZEXPORT unzGetCurrentFileInfo64 OF((unzFile file,
-                         unz_file_info64 *pfile_info,
-                         char *szFileName,
-                         uLong fileNameBufferSize,
-                         void *extraField,
-                         uLong extraFieldBufferSize,
-                         char *szComment,
-                         uLong commentBufferSize));
-
-extern int ZEXPORT unzGetCurrentFileInfo OF((unzFile file,
-                         unz_file_info *pfile_info,
-                         char *szFileName,
-                         uLong fileNameBufferSize,
-                         void *extraField,
-                         uLong extraFieldBufferSize,
-                         char *szComment,
-                         uLong commentBufferSize));
-/*
-  Get Info about the current file
-  if pfile_info!=NULL, the *pfile_info structure will contain somes info about
-        the current file
-  if szFileName!=NULL, the filemane string will be copied in szFileName
-            (fileNameBufferSize is the size of the buffer)
-  if extraField!=NULL, the extra field information will be copied in extraField
-            (extraFieldBufferSize is the size of the buffer).
-            This is the Central-header version of the extra field
-  if szComment!=NULL, the comment string of the file will be copied in szComment
-            (commentBufferSize is the size of the buffer)
-*/
-
-
-/** Addition for GDAL : START */
-
-extern ZPOS64_T ZEXPORT unzGetCurrentFileZStreamPos64 OF((unzFile file));
-
-/** Addition for GDAL : END */
-
-
-/***************************************************************************/
-/* for reading the content of the current zipfile, you can open it, read data
-   from it, and close it (you can close it before reading all the file)
-   */
-
-extern int ZEXPORT unzOpenCurrentFile OF((unzFile file));
-/*
-  Open for reading data the current file in the zipfile.
-  If there is no error, the return value is UNZ_OK.
-*/
-
-extern int ZEXPORT unzOpenCurrentFilePassword OF((unzFile file,
-                                                  const char* password));
-/*
-  Open for reading data the current file in the zipfile.
-  password is a crypting password
-  If there is no error, the return value is UNZ_OK.
-*/
-
-extern int ZEXPORT unzOpenCurrentFile2 OF((unzFile file,
-                                           int* method,
-                                           int* level,
-                                           int raw));
-/*
-  Same than unzOpenCurrentFile, but open for read raw the file (not uncompress)
-    if raw==1
-  *method will receive method of compression, *level will receive level of
-     compression
-  note : you can set level parameter as NULL (if you did not want known level,
-         but you CANNOT set method parameter as NULL
-*/
-
-extern int ZEXPORT unzOpenCurrentFile3 OF((unzFile file,
-                                           int* method,
-                                           int* level,
-                                           int raw,
-                                           const char* password));
-/*
-  Same than unzOpenCurrentFile, but open for read raw the file (not uncompress)
-    if raw==1
-  *method will receive method of compression, *level will receive level of
-     compression
-  note : you can set level parameter as NULL (if you did not want known level,
-         but you CANNOT set method parameter as NULL
-*/
-
-
-extern int ZEXPORT unzCloseCurrentFile OF((unzFile file));
-/*
-  Close the file in zip opened with unzOpenCurrentFile
-  Return UNZ_CRCERROR if all the file was read but the CRC is not good
-*/
-
-extern int ZEXPORT unzReadCurrentFile OF((unzFile file,
-                      voidp buf,
-                      unsigned len));
-/*
-  Read bytes from the current file (opened by unzOpenCurrentFile)
-  buf contain buffer where data must be copied
-  len the size of buf.
-
-  return the number of byte copied if somes bytes are copied
-  return 0 if the end of file was reached
-  return <0 with error code if there is an error
-    (UNZ_ERRNO for IO error, or zLib error for uncompress error)
-*/
-
-extern z_off_t ZEXPORT unztell OF((unzFile file));
-
-extern ZPOS64_T ZEXPORT unztell64 OF((unzFile file));
-/*
-  Give the current position in uncompressed data
-*/
-
-extern int ZEXPORT unzeof OF((unzFile file));
-/*
-  return 1 if the end of file was reached, 0 elsewhere
-*/
-
-extern int ZEXPORT unzGetLocalExtrafield OF((unzFile file,
-                                             voidp buf,
-                                             unsigned len));
-/*
-  Read extra field from the current file (opened by unzOpenCurrentFile)
-  This is the local-header version of the extra field (sometimes, there is
-    more info in the local-header version than in the central-header)
-
-  if buf==NULL, it return the size of the local extra field
-
-  if buf!=NULL, len is the size of the buffer, the extra header is copied in
-    buf.
-  the return value is the number of bytes copied in buf, or (if <0)
-    the error code
-*/
-
-/***************************************************************************/
-
-/* Get the current file offset */
-extern ZPOS64_T ZEXPORT unzGetOffset64 (unzFile file);
-extern uLong ZEXPORT unzGetOffset (unzFile file);
-
-/* Set the current file offset */
-extern int ZEXPORT unzSetOffset64 (unzFile file, ZPOS64_T pos);
-extern int ZEXPORT unzSetOffset (unzFile file, uLong pos);
-
-
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* _unz64_H */
diff --git a/src/png/zlib/contrib/minizip/zip.c b/src/png/zlib/contrib/minizip/zip.c
deleted file mode 100644
index 44e88a9cb..000000000
--- a/src/png/zlib/contrib/minizip/zip.c
+++ /dev/null
@@ -1,2007 +0,0 @@
-/* zip.c -- IO on .zip files using zlib
-   Version 1.1, February 14h, 2010
-   part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Modifications for Zip64 support
-         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
-
-         For more info read MiniZip_info.txt
-
-         Changes
-   Oct-2009 - Mathias Svensson - Remove old C style function prototypes
-   Oct-2009 - Mathias Svensson - Added Zip64 Support when creating new file archives
-   Oct-2009 - Mathias Svensson - Did some code cleanup and refactoring to get better overview of some functions.
-   Oct-2009 - Mathias Svensson - Added zipRemoveExtraInfoBlock to strip extra field data from its ZIP64 data
-                                 It is used when recreting zip archive with RAW when deleting items from a zip.
-                                 ZIP64 data is automatically added to items that needs it, and existing ZIP64 data need to be removed.
-   Oct-2009 - Mathias Svensson - Added support for BZIP2 as compression mode (bzip2 lib is required)
-   Jan-2010 - back to unzip and minizip 1.0 name scheme, with compatibility layer
-
-*/
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include "zlib.h"
-#include "zip.h"
-
-#ifdef STDC
-#  include <stddef.h>
-#  include <string.h>
-#  include <stdlib.h>
-#endif
-#ifdef NO_ERRNO_H
-    extern int errno;
-#else
-#   include <errno.h>
-#endif
-
-
-#ifndef local
-#  define local static
-#endif
-/* compile with -Dlocal if your debugger can't find static symbols */
-
-#ifndef VERSIONMADEBY
-# define VERSIONMADEBY   (0x0) /* platform depedent */
-#endif
-
-#ifndef Z_BUFSIZE
-#define Z_BUFSIZE (64*1024) //(16384)
-#endif
-
-#ifndef Z_MAXFILENAMEINZIP
-#define Z_MAXFILENAMEINZIP (256)
-#endif
-
-#ifndef ALLOC
-# define ALLOC(size) (malloc(size))
-#endif
-#ifndef TRYFREE
-# define TRYFREE(p) {if (p) free(p);}
-#endif
-
-/*
-#define SIZECENTRALDIRITEM (0x2e)
-#define SIZEZIPLOCALHEADER (0x1e)
-*/
-
-/* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */
-
-
-// NOT sure that this work on ALL platform
-#define MAKEULONG64(a, b) ((ZPOS64_T)(((unsigned long)(a)) | ((ZPOS64_T)((unsigned long)(b))) << 32))
-
-#ifndef SEEK_CUR
-#define SEEK_CUR    1
-#endif
-
-#ifndef SEEK_END
-#define SEEK_END    2
-#endif
-
-#ifndef SEEK_SET
-#define SEEK_SET    0
-#endif
-
-#ifndef DEF_MEM_LEVEL
-#if MAX_MEM_LEVEL >= 8
-#  define DEF_MEM_LEVEL 8
-#else
-#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
-#endif
-#endif
-const char zip_copyright[] =" zip 1.01 Copyright 1998-2004 Gilles Vollant - http://www.winimage.com/zLibDll";
-
-
-#define SIZEDATA_INDATABLOCK (4096-(4*4))
-
-#define LOCALHEADERMAGIC    (0x04034b50)
-#define CENTRALHEADERMAGIC  (0x02014b50)
-#define ENDHEADERMAGIC      (0x06054b50)
-#define ZIP64ENDHEADERMAGIC      (0x6064b50)
-#define ZIP64ENDLOCHEADERMAGIC   (0x7064b50)
-
-#define FLAG_LOCALHEADER_OFFSET (0x06)
-#define CRC_LOCALHEADER_OFFSET  (0x0e)
-
-#define SIZECENTRALHEADER (0x2e) /* 46 */
-
-typedef struct linkedlist_datablock_internal_s
-{
-  struct linkedlist_datablock_internal_s* next_datablock;
-  uLong  avail_in_this_block;
-  uLong  filled_in_this_block;
-  uLong  unused; /* for future use and alignment */
-  unsigned char data[SIZEDATA_INDATABLOCK];
-} linkedlist_datablock_internal;
-
-typedef struct linkedlist_data_s
-{
-    linkedlist_datablock_internal* first_block;
-    linkedlist_datablock_internal* last_block;
-} linkedlist_data;
-
-
-typedef struct
-{
-    z_stream stream;            /* zLib stream structure for inflate */
-#ifdef HAVE_BZIP2
-    bz_stream bstream;          /* bzLib stream structure for bziped */
-#endif
-
-    int  stream_initialised;    /* 1 is stream is initialised */
-    uInt pos_in_buffered_data;  /* last written byte in buffered_data */
-
-    ZPOS64_T pos_local_header;     /* offset of the local header of the file
-                                     currenty writing */
-    char* central_header;       /* central header data for the current file */
-    uLong size_centralExtra;
-    uLong size_centralheader;   /* size of the central header for cur file */
-    uLong size_centralExtraFree; /* Extra bytes allocated to the centralheader but that are not used */
-    uLong flag;                 /* flag of the file currently writing */
-
-    int  method;                /* compression method of file currenty wr.*/
-    int  raw;                   /* 1 for directly writing raw data */
-    Byte buffered_data[Z_BUFSIZE];/* buffer contain compressed data to be writ*/
-    uLong dosDate;
-    uLong crc32;
-    int  encrypt;
-    int  zip64;               /* Add ZIP64 extened information in the extra field */
-    ZPOS64_T pos_zip64extrainfo;
-    ZPOS64_T totalCompressedData;
-    ZPOS64_T totalUncompressedData;
-#ifndef NOCRYPT
-    unsigned long keys[3];     /* keys defining the pseudo-random sequence */
-    const z_crc_t* pcrc_32_tab;
-    int crypt_header_size;
-#endif
-} curfile64_info;
-
-typedef struct
-{
-    zlib_filefunc64_32_def z_filefunc;
-    voidpf filestream;        /* io structore of the zipfile */
-    linkedlist_data central_dir;/* datablock with central dir in construction*/
-    int  in_opened_file_inzip;  /* 1 if a file in the zip is currently writ.*/
-    curfile64_info ci;            /* info on the file curretly writing */
-
-    ZPOS64_T begin_pos;            /* position of the beginning of the zipfile */
-    ZPOS64_T add_position_when_writing_offset;
-    ZPOS64_T number_entry;
-
-#ifndef NO_ADDFILEINEXISTINGZIP
-    char *globalcomment;
-#endif
-
-} zip64_internal;
-
-
-#ifndef NOCRYPT
-#define INCLUDECRYPTINGCODE_IFCRYPTALLOWED
-#include "crypt.h"
-#endif
-
-local linkedlist_datablock_internal* allocate_new_datablock()
-{
-    linkedlist_datablock_internal* ldi;
-    ldi = (linkedlist_datablock_internal*)
-                 ALLOC(sizeof(linkedlist_datablock_internal));
-    if (ldi!=NULL)
-    {
-        ldi->next_datablock = NULL ;
-        ldi->filled_in_this_block = 0 ;
-        ldi->avail_in_this_block = SIZEDATA_INDATABLOCK ;
-    }
-    return ldi;
-}
-
-local void free_datablock(linkedlist_datablock_internal* ldi)
-{
-    while (ldi!=NULL)
-    {
-        linkedlist_datablock_internal* ldinext = ldi->next_datablock;
-        TRYFREE(ldi);
-        ldi = ldinext;
-    }
-}
-
-local void init_linkedlist(linkedlist_data* ll)
-{
-    ll->first_block = ll->last_block = NULL;
-}
-
-local void free_linkedlist(linkedlist_data* ll)
-{
-    free_datablock(ll->first_block);
-    ll->first_block = ll->last_block = NULL;
-}
-
-
-local int add_data_in_datablock(linkedlist_data* ll, const void* buf, uLong len)
-{
-    linkedlist_datablock_internal* ldi;
-    const unsigned char* from_copy;
-
-    if (ll==NULL)
-        return ZIP_INTERNALERROR;
-
-    if (ll->last_block == NULL)
-    {
-        ll->first_block = ll->last_block = allocate_new_datablock();
-        if (ll->first_block == NULL)
-            return ZIP_INTERNALERROR;
-    }
-
-    ldi = ll->last_block;
-    from_copy = (unsigned char*)buf;
-
-    while (len>0)
-    {
-        uInt copy_this;
-        uInt i;
-        unsigned char* to_copy;
-
-        if (ldi->avail_in_this_block==0)
-        {
-            ldi->next_datablock = allocate_new_datablock();
-            if (ldi->next_datablock == NULL)
-                return ZIP_INTERNALERROR;
-            ldi = ldi->next_datablock ;
-            ll->last_block = ldi;
-        }
-
-        if (ldi->avail_in_this_block < len)
-            copy_this = (uInt)ldi->avail_in_this_block;
-        else
-            copy_this = (uInt)len;
-
-        to_copy = &(ldi->data[ldi->filled_in_this_block]);
-
-        for (i=0;i<copy_this;i++)
-            *(to_copy+i)=*(from_copy+i);
-
-        ldi->filled_in_this_block += copy_this;
-        ldi->avail_in_this_block -= copy_this;
-        from_copy += copy_this ;
-        len -= copy_this;
-    }
-    return ZIP_OK;
-}
-
-
-
-/****************************************************************************/
-
-#ifndef NO_ADDFILEINEXISTINGZIP
-/* ===========================================================================
-   Inputs a long in LSB order to the given file
-   nbByte == 1, 2 ,4 or 8 (byte, short or long, ZPOS64_T)
-*/
-
-local int zip64local_putValue OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, ZPOS64_T x, int nbByte));
-local int zip64local_putValue (const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, ZPOS64_T x, int nbByte)
-{
-    unsigned char buf[8];
-    int n;
-    for (n = 0; n < nbByte; n++)
-    {
-        buf[n] = (unsigned char)(x & 0xff);
-        x >>= 8;
-    }
-    if (x != 0)
-      {     /* data overflow - hack for ZIP64 (X Roche) */
-      for (n = 0; n < nbByte; n++)
-        {
-          buf[n] = 0xff;
-        }
-      }
-
-    if (ZWRITE64(*pzlib_filefunc_def,filestream,buf,nbByte)!=(uLong)nbByte)
-        return ZIP_ERRNO;
-    else
-        return ZIP_OK;
-}
-
-local void zip64local_putValue_inmemory OF((void* dest, ZPOS64_T x, int nbByte));
-local void zip64local_putValue_inmemory (void* dest, ZPOS64_T x, int nbByte)
-{
-    unsigned char* buf=(unsigned char*)dest;
-    int n;
-    for (n = 0; n < nbByte; n++) {
-        buf[n] = (unsigned char)(x & 0xff);
-        x >>= 8;
-    }
-
-    if (x != 0)
-    {     /* data overflow - hack for ZIP64 */
-       for (n = 0; n < nbByte; n++)
-       {
-          buf[n] = 0xff;
-       }
-    }
-}
-
-/****************************************************************************/
-
-
-local uLong zip64local_TmzDateToDosDate(const tm_zip* ptm)
-{
-    uLong year = (uLong)ptm->tm_year;
-    if (year>=1980)
-        year-=1980;
-    else if (year>=80)
-        year-=80;
-    return
-      (uLong) (((ptm->tm_mday) + (32 * (ptm->tm_mon+1)) + (512 * year)) << 16) |
-        ((ptm->tm_sec/2) + (32* ptm->tm_min) + (2048 * (uLong)ptm->tm_hour));
-}
-
-
-/****************************************************************************/
-
-local int zip64local_getByte OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, int *pi));
-
-local int zip64local_getByte(const zlib_filefunc64_32_def* pzlib_filefunc_def,voidpf filestream,int* pi)
-{
-    unsigned char c;
-    int err = (int)ZREAD64(*pzlib_filefunc_def,filestream,&c,1);
-    if (err==1)
-    {
-        *pi = (int)c;
-        return ZIP_OK;
-    }
-    else
-    {
-        if (ZERROR64(*pzlib_filefunc_def,filestream))
-            return ZIP_ERRNO;
-        else
-            return ZIP_EOF;
-    }
-}
-
-
-/* ===========================================================================
-   Reads a long in LSB order from the given gz_stream. Sets
-*/
-local int zip64local_getShort OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, uLong *pX));
-
-local int zip64local_getShort (const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, uLong* pX)
-{
-    uLong x ;
-    int i = 0;
-    int err;
-
-    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x = (uLong)i;
-
-    if (err==ZIP_OK)
-        err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x += ((uLong)i)<<8;
-
-    if (err==ZIP_OK)
-        *pX = x;
-    else
-        *pX = 0;
-    return err;
-}
-
-local int zip64local_getLong OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, uLong *pX));
-
-local int zip64local_getLong (const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, uLong* pX)
-{
-    uLong x ;
-    int i = 0;
-    int err;
-
-    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x = (uLong)i;
-
-    if (err==ZIP_OK)
-        err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x += ((uLong)i)<<8;
-
-    if (err==ZIP_OK)
-        err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x += ((uLong)i)<<16;
-
-    if (err==ZIP_OK)
-        err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-    x += ((uLong)i)<<24;
-
-    if (err==ZIP_OK)
-        *pX = x;
-    else
-        *pX = 0;
-    return err;
-}
-
-local int zip64local_getLong64 OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, ZPOS64_T *pX));
-
-
-local int zip64local_getLong64 (const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream, ZPOS64_T *pX)
-{
-  ZPOS64_T x;
-  int i = 0;
-  int err;
-
-  err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-  x = (ZPOS64_T)i;
-
-  if (err==ZIP_OK)
-    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-  x += ((ZPOS64_T)i)<<8;
-
-  if (err==ZIP_OK)
-    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-  x += ((ZPOS64_T)i)<<16;
-
-  if (err==ZIP_OK)
-    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-  x += ((ZPOS64_T)i)<<24;
-
-  if (err==ZIP_OK)
-    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-  x += ((ZPOS64_T)i)<<32;
-
-  if (err==ZIP_OK)
-    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-  x += ((ZPOS64_T)i)<<40;
-
-  if (err==ZIP_OK)
-    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-  x += ((ZPOS64_T)i)<<48;
-
-  if (err==ZIP_OK)
-    err = zip64local_getByte(pzlib_filefunc_def,filestream,&i);
-  x += ((ZPOS64_T)i)<<56;
-
-  if (err==ZIP_OK)
-    *pX = x;
-  else
-    *pX = 0;
-
-  return err;
-}
-
-#ifndef BUFREADCOMMENT
-#define BUFREADCOMMENT (0x400)
-#endif
-/*
-  Locate the Central directory of a zipfile (at the end, just before
-    the global comment)
-*/
-local ZPOS64_T zip64local_SearchCentralDir OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream));
-
-local ZPOS64_T zip64local_SearchCentralDir(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream)
-{
-  unsigned char* buf;
-  ZPOS64_T uSizeFile;
-  ZPOS64_T uBackRead;
-  ZPOS64_T uMaxBack=0xffff; /* maximum size of global comment */
-  ZPOS64_T uPosFound=0;
-
-  if (ZSEEK64(*pzlib_filefunc_def,filestream,0,ZLIB_FILEFUNC_SEEK_END) != 0)
-    return 0;
-
-
-  uSizeFile = ZTELL64(*pzlib_filefunc_def,filestream);
-
-  if (uMaxBack>uSizeFile)
-    uMaxBack = uSizeFile;
-
-  buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
-  if (buf==NULL)
-    return 0;
-
-  uBackRead = 4;
-  while (uBackRead<uMaxBack)
-  {
-    uLong uReadSize;
-    ZPOS64_T uReadPos ;
-    int i;
-    if (uBackRead+BUFREADCOMMENT>uMaxBack)
-      uBackRead = uMaxBack;
-    else
-      uBackRead+=BUFREADCOMMENT;
-    uReadPos = uSizeFile-uBackRead ;
-
-    uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
-      (BUFREADCOMMENT+4) : (uLong)(uSizeFile-uReadPos);
-    if (ZSEEK64(*pzlib_filefunc_def,filestream,uReadPos,ZLIB_FILEFUNC_SEEK_SET)!=0)
-      break;
-
-    if (ZREAD64(*pzlib_filefunc_def,filestream,buf,uReadSize)!=uReadSize)
-      break;
-
-    for (i=(int)uReadSize-3; (i--)>0;)
-      if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) &&
-        ((*(buf+i+2))==0x05) && ((*(buf+i+3))==0x06))
-      {
-        uPosFound = uReadPos+i;
-        break;
-      }
-
-      if (uPosFound!=0)
-        break;
-  }
-  TRYFREE(buf);
-  return uPosFound;
-}
-
-/*
-Locate the End of Zip64 Central directory locator and from there find the CD of a zipfile (at the end, just before
-the global comment)
-*/
-local ZPOS64_T zip64local_SearchCentralDir64 OF((const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream));
-
-local ZPOS64_T zip64local_SearchCentralDir64(const zlib_filefunc64_32_def* pzlib_filefunc_def, voidpf filestream)
-{
-  unsigned char* buf;
-  ZPOS64_T uSizeFile;
-  ZPOS64_T uBackRead;
-  ZPOS64_T uMaxBack=0xffff; /* maximum size of global comment */
-  ZPOS64_T uPosFound=0;
-  uLong uL;
-  ZPOS64_T relativeOffset;
-
-  if (ZSEEK64(*pzlib_filefunc_def,filestream,0,ZLIB_FILEFUNC_SEEK_END) != 0)
-    return 0;
-
-  uSizeFile = ZTELL64(*pzlib_filefunc_def,filestream);
-
-  if (uMaxBack>uSizeFile)
-    uMaxBack = uSizeFile;
-
-  buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
-  if (buf==NULL)
-    return 0;
-
-  uBackRead = 4;
-  while (uBackRead<uMaxBack)
-  {
-    uLong uReadSize;
-    ZPOS64_T uReadPos;
-    int i;
-    if (uBackRead+BUFREADCOMMENT>uMaxBack)
-      uBackRead = uMaxBack;
-    else
-      uBackRead+=BUFREADCOMMENT;
-    uReadPos = uSizeFile-uBackRead ;
-
-    uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ?
-      (BUFREADCOMMENT+4) : (uLong)(uSizeFile-uReadPos);
-    if (ZSEEK64(*pzlib_filefunc_def,filestream,uReadPos,ZLIB_FILEFUNC_SEEK_SET)!=0)
-      break;
-
-    if (ZREAD64(*pzlib_filefunc_def,filestream,buf,uReadSize)!=uReadSize)
-      break;
-
-    for (i=(int)uReadSize-3; (i--)>0;)
-    {
-      // Signature "0x07064b50" Zip64 end of central directory locater
-      if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) && ((*(buf+i+2))==0x06) && ((*(buf+i+3))==0x07))
-      {
-        uPosFound = uReadPos+i;
-        break;
-      }
-    }
-
-      if (uPosFound!=0)
-        break;
-  }
-
-  TRYFREE(buf);
-  if (uPosFound == 0)
-    return 0;
-
-  /* Zip64 end of central directory locator */
-  if (ZSEEK64(*pzlib_filefunc_def,filestream, uPosFound,ZLIB_FILEFUNC_SEEK_SET)!=0)
-    return 0;
-
-  /* the signature, already checked */
-  if (zip64local_getLong(pzlib_filefunc_def,filestream,&uL)!=ZIP_OK)
-    return 0;
-
-  /* number of the disk with the start of the zip64 end of  central directory */
-  if (zip64local_getLong(pzlib_filefunc_def,filestream,&uL)!=ZIP_OK)
-    return 0;
-  if (uL != 0)
-    return 0;
-
-  /* relative offset of the zip64 end of central directory record */
-  if (zip64local_getLong64(pzlib_filefunc_def,filestream,&relativeOffset)!=ZIP_OK)
-    return 0;
-
-  /* total number of disks */
-  if (zip64local_getLong(pzlib_filefunc_def,filestream,&uL)!=ZIP_OK)
-    return 0;
-  if (uL != 1)
-    return 0;
-
-  /* Goto Zip64 end of central directory record */
-  if (ZSEEK64(*pzlib_filefunc_def,filestream, relativeOffset,ZLIB_FILEFUNC_SEEK_SET)!=0)
-    return 0;
-
-  /* the signature */
-  if (zip64local_getLong(pzlib_filefunc_def,filestream,&uL)!=ZIP_OK)
-    return 0;
-
-  if (uL != 0x06064b50) // signature of 'Zip64 end of central directory'
-    return 0;
-
-  return relativeOffset;
-}
-
-int LoadCentralDirectoryRecord(zip64_internal* pziinit)
-{
-  int err=ZIP_OK;
-  ZPOS64_T byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
-
-  ZPOS64_T size_central_dir;     /* size of the central directory  */
-  ZPOS64_T offset_central_dir;   /* offset of start of central directory */
-  ZPOS64_T central_pos;
-  uLong uL;
-
-  uLong number_disk;          /* number of the current dist, used for
-                              spaning ZIP, unsupported, always 0*/
-  uLong number_disk_with_CD;  /* number the the disk with central dir, used
-                              for spaning ZIP, unsupported, always 0*/
-  ZPOS64_T number_entry;
-  ZPOS64_T number_entry_CD;      /* total number of entries in
-                                the central dir
-                                (same than number_entry on nospan) */
-  uLong VersionMadeBy;
-  uLong VersionNeeded;
-  uLong size_comment;
-
-  int hasZIP64Record = 0;
-
-  // check first if we find a ZIP64 record
-  central_pos = zip64local_SearchCentralDir64(&pziinit->z_filefunc,pziinit->filestream);
-  if(central_pos > 0)
-  {
-    hasZIP64Record = 1;
-  }
-  else if(central_pos == 0)
-  {
-    central_pos = zip64local_SearchCentralDir(&pziinit->z_filefunc,pziinit->filestream);
-  }
-
-/* disable to allow appending to empty ZIP archive
-        if (central_pos==0)
-            err=ZIP_ERRNO;
-*/
-
-  if(hasZIP64Record)
-  {
-    ZPOS64_T sizeEndOfCentralDirectory;
-    if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, central_pos, ZLIB_FILEFUNC_SEEK_SET) != 0)
-      err=ZIP_ERRNO;
-
-    /* the signature, already checked */
-    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&uL)!=ZIP_OK)
-      err=ZIP_ERRNO;
-
-    /* size of zip64 end of central directory record */
-    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream, &sizeEndOfCentralDirectory)!=ZIP_OK)
-      err=ZIP_ERRNO;
-
-    /* version made by */
-    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &VersionMadeBy)!=ZIP_OK)
-      err=ZIP_ERRNO;
-
-    /* version needed to extract */
-    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &VersionNeeded)!=ZIP_OK)
-      err=ZIP_ERRNO;
-
-    /* number of this disk */
-    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&number_disk)!=ZIP_OK)
-      err=ZIP_ERRNO;
-
-    /* number of the disk with the start of the central directory */
-    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&number_disk_with_CD)!=ZIP_OK)
-      err=ZIP_ERRNO;
-
-    /* total number of entries in the central directory on this disk */
-    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream, &number_entry)!=ZIP_OK)
-      err=ZIP_ERRNO;
-
-    /* total number of entries in the central directory */
-    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&number_entry_CD)!=ZIP_OK)
-      err=ZIP_ERRNO;
-
-    if ((number_entry_CD!=number_entry) || (number_disk_with_CD!=0) || (number_disk!=0))
-      err=ZIP_BADZIPFILE;
-
-    /* size of the central directory */
-    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&size_central_dir)!=ZIP_OK)
-      err=ZIP_ERRNO;
-
-    /* offset of start of central directory with respect to the
-    starting disk number */
-    if (zip64local_getLong64(&pziinit->z_filefunc, pziinit->filestream,&offset_central_dir)!=ZIP_OK)
-      err=ZIP_ERRNO;
-
-    // TODO..
-    // read the comment from the standard central header.
-    size_comment = 0;
-  }
-  else
-  {
-    // Read End of central Directory info
-    if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, central_pos,ZLIB_FILEFUNC_SEEK_SET)!=0)
-      err=ZIP_ERRNO;
-
-    /* the signature, already checked */
-    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream,&uL)!=ZIP_OK)
-      err=ZIP_ERRNO;
-
-    /* number of this disk */
-    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream,&number_disk)!=ZIP_OK)
-      err=ZIP_ERRNO;
-
-    /* number of the disk with the start of the central directory */
-    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream,&number_disk_with_CD)!=ZIP_OK)
-      err=ZIP_ERRNO;
-
-    /* total number of entries in the central dir on this disk */
-    number_entry = 0;
-    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
-      err=ZIP_ERRNO;
-    else
-      number_entry = uL;
-
-    /* total number of entries in the central dir */
-    number_entry_CD = 0;
-    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
-      err=ZIP_ERRNO;
-    else
-      number_entry_CD = uL;
-
-    if ((number_entry_CD!=number_entry) || (number_disk_with_CD!=0) || (number_disk!=0))
-      err=ZIP_BADZIPFILE;
-
-    /* size of the central directory */
-    size_central_dir = 0;
-    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
-      err=ZIP_ERRNO;
-    else
-      size_central_dir = uL;
-
-    /* offset of start of central directory with respect to the starting disk number */
-    offset_central_dir = 0;
-    if (zip64local_getLong(&pziinit->z_filefunc, pziinit->filestream, &uL)!=ZIP_OK)
-      err=ZIP_ERRNO;
-    else
-      offset_central_dir = uL;
-
-
-    /* zipfile global comment length */
-    if (zip64local_getShort(&pziinit->z_filefunc, pziinit->filestream, &size_comment)!=ZIP_OK)
-      err=ZIP_ERRNO;
-  }
-
-  if ((central_pos<offset_central_dir+size_central_dir) &&
-    (err==ZIP_OK))
-    err=ZIP_BADZIPFILE;
-
-  if (err!=ZIP_OK)
-  {
-    ZCLOSE64(pziinit->z_filefunc, pziinit->filestream);
-    return ZIP_ERRNO;
-  }
-
-  if (size_comment>0)
-  {
-    pziinit->globalcomment = (char*)ALLOC(size_comment+1);
-    if (pziinit->globalcomment)
-    {
-      size_comment = ZREAD64(pziinit->z_filefunc, pziinit->filestream, pziinit->globalcomment,size_comment);
-      pziinit->globalcomment[size_comment]=0;
-    }
-  }
-
-  byte_before_the_zipfile = central_pos - (offset_central_dir+size_central_dir);
-  pziinit->add_position_when_writing_offset = byte_before_the_zipfile;
-
-  {
-    ZPOS64_T size_central_dir_to_read = size_central_dir;
-    size_t buf_size = SIZEDATA_INDATABLOCK;
-    void* buf_read = (void*)ALLOC(buf_size);
-    if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, offset_central_dir + byte_before_the_zipfile, ZLIB_FILEFUNC_SEEK_SET) != 0)
-      err=ZIP_ERRNO;
-
-    while ((size_central_dir_to_read>0) && (err==ZIP_OK))
-    {
-      ZPOS64_T read_this = SIZEDATA_INDATABLOCK;
-      if (read_this > size_central_dir_to_read)
-        read_this = size_central_dir_to_read;
-
-      if (ZREAD64(pziinit->z_filefunc, pziinit->filestream,buf_read,(uLong)read_this) != read_this)
-        err=ZIP_ERRNO;
-
-      if (err==ZIP_OK)
-        err = add_data_in_datablock(&pziinit->central_dir,buf_read, (uLong)read_this);
-
-      size_central_dir_to_read-=read_this;
-    }
-    TRYFREE(buf_read);
-  }
-  pziinit->begin_pos = byte_before_the_zipfile;
-  pziinit->number_entry = number_entry_CD;
-
-  if (ZSEEK64(pziinit->z_filefunc, pziinit->filestream, offset_central_dir+byte_before_the_zipfile,ZLIB_FILEFUNC_SEEK_SET) != 0)
-    err=ZIP_ERRNO;
-
-  return err;
-}
-
-
-#endif /* !NO_ADDFILEINEXISTINGZIP*/
-
-
-/************************************************************/
-extern zipFile ZEXPORT zipOpen3 (const void *pathname, int append, zipcharpc* globalcomment, zlib_filefunc64_32_def* pzlib_filefunc64_32_def)
-{
-    zip64_internal ziinit;
-    zip64_internal* zi;
-    int err=ZIP_OK;
-
-    ziinit.z_filefunc.zseek32_file = NULL;
-    ziinit.z_filefunc.ztell32_file = NULL;
-    if (pzlib_filefunc64_32_def==NULL)
-        fill_fopen64_filefunc(&ziinit.z_filefunc.zfile_func64);
-    else
-        ziinit.z_filefunc = *pzlib_filefunc64_32_def;
-
-    ziinit.filestream = ZOPEN64(ziinit.z_filefunc,
-                  pathname,
-                  (append == APPEND_STATUS_CREATE) ?
-                  (ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_WRITE | ZLIB_FILEFUNC_MODE_CREATE) :
-                    (ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_WRITE | ZLIB_FILEFUNC_MODE_EXISTING));
-
-    if (ziinit.filestream == NULL)
-        return NULL;
-
-    if (append == APPEND_STATUS_CREATEAFTER)
-        ZSEEK64(ziinit.z_filefunc,ziinit.filestream,0,SEEK_END);
-
-    ziinit.begin_pos = ZTELL64(ziinit.z_filefunc,ziinit.filestream);
-    ziinit.in_opened_file_inzip = 0;
-    ziinit.ci.stream_initialised = 0;
-    ziinit.number_entry = 0;
-    ziinit.add_position_when_writing_offset = 0;
-    init_linkedlist(&(ziinit.central_dir));
-
-
-
-    zi = (zip64_internal*)ALLOC(sizeof(zip64_internal));
-    if (zi==NULL)
-    {
-        ZCLOSE64(ziinit.z_filefunc,ziinit.filestream);
-        return NULL;
-    }
-
-    /* now we add file in a zipfile */
-#    ifndef NO_ADDFILEINEXISTINGZIP
-    ziinit.globalcomment = NULL;
-    if (append == APPEND_STATUS_ADDINZIP)
-    {
-      // Read and Cache Central Directory Records
-      err = LoadCentralDirectoryRecord(&ziinit);
-    }
-
-    if (globalcomment)
-    {
-      *globalcomment = ziinit.globalcomment;
-    }
-#    endif /* !NO_ADDFILEINEXISTINGZIP*/
-
-    if (err != ZIP_OK)
-    {
-#    ifndef NO_ADDFILEINEXISTINGZIP
-        TRYFREE(ziinit.globalcomment);
-#    endif /* !NO_ADDFILEINEXISTINGZIP*/
-        TRYFREE(zi);
-        return NULL;
-    }
-    else
-    {
-        *zi = ziinit;
-        return (zipFile)zi;
-    }
-}
-
-extern zipFile ZEXPORT zipOpen2 (const char *pathname, int append, zipcharpc* globalcomment, zlib_filefunc_def* pzlib_filefunc32_def)
-{
-    if (pzlib_filefunc32_def != NULL)
-    {
-        zlib_filefunc64_32_def zlib_filefunc64_32_def_fill;
-        fill_zlib_filefunc64_32_def_from_filefunc32(&zlib_filefunc64_32_def_fill,pzlib_filefunc32_def);
-        return zipOpen3(pathname, append, globalcomment, &zlib_filefunc64_32_def_fill);
-    }
-    else
-        return zipOpen3(pathname, append, globalcomment, NULL);
-}
-
-extern zipFile ZEXPORT zipOpen2_64 (const void *pathname, int append, zipcharpc* globalcomment, zlib_filefunc64_def* pzlib_filefunc_def)
-{
-    if (pzlib_filefunc_def != NULL)
-    {
-        zlib_filefunc64_32_def zlib_filefunc64_32_def_fill;
-        zlib_filefunc64_32_def_fill.zfile_func64 = *pzlib_filefunc_def;
-        zlib_filefunc64_32_def_fill.ztell32_file = NULL;
-        zlib_filefunc64_32_def_fill.zseek32_file = NULL;
-        return zipOpen3(pathname, append, globalcomment, &zlib_filefunc64_32_def_fill);
-    }
-    else
-        return zipOpen3(pathname, append, globalcomment, NULL);
-}
-
-
-
-extern zipFile ZEXPORT zipOpen (const char* pathname, int append)
-{
-    return zipOpen3((const void*)pathname,append,NULL,NULL);
-}
-
-extern zipFile ZEXPORT zipOpen64 (const void* pathname, int append)
-{
-    return zipOpen3(pathname,append,NULL,NULL);
-}
-
-int Write_LocalFileHeader(zip64_internal* zi, const char* filename, uInt size_extrafield_local, const void* extrafield_local)
-{
-  /* write the local header */
-  int err;
-  uInt size_filename = (uInt)strlen(filename);
-  uInt size_extrafield = size_extrafield_local;
-
-  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)LOCALHEADERMAGIC, 4);
-
-  if (err==ZIP_OK)
-  {
-    if(zi->ci.zip64)
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)45,2);/* version needed to extract */
-    else
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)20,2);/* version needed to extract */
-  }
-
-  if (err==ZIP_OK)
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->ci.flag,2);
-
-  if (err==ZIP_OK)
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->ci.method,2);
-
-  if (err==ZIP_OK)
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->ci.dosDate,4);
-
-  // CRC / Compressed size / Uncompressed size will be filled in later and rewritten later
-  if (err==ZIP_OK)
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4); /* crc 32, unknown */
-  if (err==ZIP_OK)
-  {
-    if(zi->ci.zip64)
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xFFFFFFFF,4); /* compressed size, unknown */
-    else
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4); /* compressed size, unknown */
-  }
-  if (err==ZIP_OK)
-  {
-    if(zi->ci.zip64)
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xFFFFFFFF,4); /* uncompressed size, unknown */
-    else
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4); /* uncompressed size, unknown */
-  }
-
-  if (err==ZIP_OK)
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_filename,2);
-
-  if(zi->ci.zip64)
-  {
-    size_extrafield += 20;
-  }
-
-  if (err==ZIP_OK)
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_extrafield,2);
-
-  if ((err==ZIP_OK) && (size_filename > 0))
-  {
-    if (ZWRITE64(zi->z_filefunc,zi->filestream,filename,size_filename)!=size_filename)
-      err = ZIP_ERRNO;
-  }
-
-  if ((err==ZIP_OK) && (size_extrafield_local > 0))
-  {
-    if (ZWRITE64(zi->z_filefunc, zi->filestream, extrafield_local, size_extrafield_local) != size_extrafield_local)
-      err = ZIP_ERRNO;
-  }
-
-
-  if ((err==ZIP_OK) && (zi->ci.zip64))
-  {
-      // write the Zip64 extended info
-      short HeaderID = 1;
-      short DataSize = 16;
-      ZPOS64_T CompressedSize = 0;
-      ZPOS64_T UncompressedSize = 0;
-
-      // Remember position of Zip64 extended info for the local file header. (needed when we update size after done with file)
-      zi->ci.pos_zip64extrainfo = ZTELL64(zi->z_filefunc,zi->filestream);
-
-      err = zip64local_putValue(&zi->z_filefunc, zi->filestream, (short)HeaderID,2);
-      err = zip64local_putValue(&zi->z_filefunc, zi->filestream, (short)DataSize,2);
-
-      err = zip64local_putValue(&zi->z_filefunc, zi->filestream, (ZPOS64_T)UncompressedSize,8);
-      err = zip64local_putValue(&zi->z_filefunc, zi->filestream, (ZPOS64_T)CompressedSize,8);
-  }
-
-  return err;
-}
-
-/*
- NOTE.
- When writing RAW the ZIP64 extended information in extrafield_local and extrafield_global needs to be stripped
- before calling this function it can be done with zipRemoveExtraInfoBlock
-
- It is not done here because then we need to realloc a new buffer since parameters are 'const' and I want to minimize
- unnecessary allocations.
- */
-extern int ZEXPORT zipOpenNewFileInZip4_64 (zipFile file, const char* filename, const zip_fileinfo* zipfi,
-                                         const void* extrafield_local, uInt size_extrafield_local,
-                                         const void* extrafield_global, uInt size_extrafield_global,
-                                         const char* comment, int method, int level, int raw,
-                                         int windowBits,int memLevel, int strategy,
-                                         const char* password, uLong crcForCrypting,
-                                         uLong versionMadeBy, uLong flagBase, int zip64)
-{
-    zip64_internal* zi;
-    uInt size_filename;
-    uInt size_comment;
-    uInt i;
-    int err = ZIP_OK;
-
-#    ifdef NOCRYPT
-    (crcForCrypting);
-    if (password != NULL)
-        return ZIP_PARAMERROR;
-#    endif
-
-    if (file == NULL)
-        return ZIP_PARAMERROR;
-
-#ifdef HAVE_BZIP2
-    if ((method!=0) && (method!=Z_DEFLATED) && (method!=Z_BZIP2ED))
-      return ZIP_PARAMERROR;
-#else
-    if ((method!=0) && (method!=Z_DEFLATED))
-      return ZIP_PARAMERROR;
-#endif
-
-    zi = (zip64_internal*)file;
-
-    if (zi->in_opened_file_inzip == 1)
-    {
-        err = zipCloseFileInZip (file);
-        if (err != ZIP_OK)
-            return err;
-    }
-
-    if (filename==NULL)
-        filename="-";
-
-    if (comment==NULL)
-        size_comment = 0;
-    else
-        size_comment = (uInt)strlen(comment);
-
-    size_filename = (uInt)strlen(filename);
-
-    if (zipfi == NULL)
-        zi->ci.dosDate = 0;
-    else
-    {
-        if (zipfi->dosDate != 0)
-            zi->ci.dosDate = zipfi->dosDate;
-        else
-          zi->ci.dosDate = zip64local_TmzDateToDosDate(&zipfi->tmz_date);
-    }
-
-    zi->ci.flag = flagBase;
-    if ((level==8) || (level==9))
-      zi->ci.flag |= 2;
-    if (level==2)
-      zi->ci.flag |= 4;
-    if (level==1)
-      zi->ci.flag |= 6;
-    if (password != NULL)
-      zi->ci.flag |= 1;
-
-    zi->ci.crc32 = 0;
-    zi->ci.method = method;
-    zi->ci.encrypt = 0;
-    zi->ci.stream_initialised = 0;
-    zi->ci.pos_in_buffered_data = 0;
-    zi->ci.raw = raw;
-    zi->ci.pos_local_header = ZTELL64(zi->z_filefunc,zi->filestream);
-
-    zi->ci.size_centralheader = SIZECENTRALHEADER + size_filename + size_extrafield_global + size_comment;
-    zi->ci.size_centralExtraFree = 32; // Extra space we have reserved in case we need to add ZIP64 extra info data
-
-    zi->ci.central_header = (char*)ALLOC((uInt)zi->ci.size_centralheader + zi->ci.size_centralExtraFree);
-
-    zi->ci.size_centralExtra = size_extrafield_global;
-    zip64local_putValue_inmemory(zi->ci.central_header,(uLong)CENTRALHEADERMAGIC,4);
-    /* version info */
-    zip64local_putValue_inmemory(zi->ci.central_header+4,(uLong)versionMadeBy,2);
-    zip64local_putValue_inmemory(zi->ci.central_header+6,(uLong)20,2);
-    zip64local_putValue_inmemory(zi->ci.central_header+8,(uLong)zi->ci.flag,2);
-    zip64local_putValue_inmemory(zi->ci.central_header+10,(uLong)zi->ci.method,2);
-    zip64local_putValue_inmemory(zi->ci.central_header+12,(uLong)zi->ci.dosDate,4);
-    zip64local_putValue_inmemory(zi->ci.central_header+16,(uLong)0,4); /*crc*/
-    zip64local_putValue_inmemory(zi->ci.central_header+20,(uLong)0,4); /*compr size*/
-    zip64local_putValue_inmemory(zi->ci.central_header+24,(uLong)0,4); /*uncompr size*/
-    zip64local_putValue_inmemory(zi->ci.central_header+28,(uLong)size_filename,2);
-    zip64local_putValue_inmemory(zi->ci.central_header+30,(uLong)size_extrafield_global,2);
-    zip64local_putValue_inmemory(zi->ci.central_header+32,(uLong)size_comment,2);
-    zip64local_putValue_inmemory(zi->ci.central_header+34,(uLong)0,2); /*disk nm start*/
-
-    if (zipfi==NULL)
-        zip64local_putValue_inmemory(zi->ci.central_header+36,(uLong)0,2);
-    else
-        zip64local_putValue_inmemory(zi->ci.central_header+36,(uLong)zipfi->internal_fa,2);
-
-    if (zipfi==NULL)
-        zip64local_putValue_inmemory(zi->ci.central_header+38,(uLong)0,4);
-    else
-        zip64local_putValue_inmemory(zi->ci.central_header+38,(uLong)zipfi->external_fa,4);
-
-    if(zi->ci.pos_local_header >= 0xffffffff)
-      zip64local_putValue_inmemory(zi->ci.central_header+42,(uLong)0xffffffff,4);
-    else
-      zip64local_putValue_inmemory(zi->ci.central_header+42,(uLong)zi->ci.pos_local_header - zi->add_position_when_writing_offset,4);
-
-    for (i=0;i<size_filename;i++)
-        *(zi->ci.central_header+SIZECENTRALHEADER+i) = *(filename+i);
-
-    for (i=0;i<size_extrafield_global;i++)
-        *(zi->ci.central_header+SIZECENTRALHEADER+size_filename+i) =
-              *(((const char*)extrafield_global)+i);
-
-    for (i=0;i<size_comment;i++)
-        *(zi->ci.central_header+SIZECENTRALHEADER+size_filename+
-              size_extrafield_global+i) = *(comment+i);
-    if (zi->ci.central_header == NULL)
-        return ZIP_INTERNALERROR;
-
-    zi->ci.zip64 = zip64;
-    zi->ci.totalCompressedData = 0;
-    zi->ci.totalUncompressedData = 0;
-    zi->ci.pos_zip64extrainfo = 0;
-
-    err = Write_LocalFileHeader(zi, filename, size_extrafield_local, extrafield_local);
-
-#ifdef HAVE_BZIP2
-    zi->ci.bstream.avail_in = (uInt)0;
-    zi->ci.bstream.avail_out = (uInt)Z_BUFSIZE;
-    zi->ci.bstream.next_out = (char*)zi->ci.buffered_data;
-    zi->ci.bstream.total_in_hi32 = 0;
-    zi->ci.bstream.total_in_lo32 = 0;
-    zi->ci.bstream.total_out_hi32 = 0;
-    zi->ci.bstream.total_out_lo32 = 0;
-#endif
-
-    zi->ci.stream.avail_in = (uInt)0;
-    zi->ci.stream.avail_out = (uInt)Z_BUFSIZE;
-    zi->ci.stream.next_out = zi->ci.buffered_data;
-    zi->ci.stream.total_in = 0;
-    zi->ci.stream.total_out = 0;
-    zi->ci.stream.data_type = Z_BINARY;
-
-#ifdef HAVE_BZIP2
-    if ((err==ZIP_OK) && (zi->ci.method == Z_DEFLATED || zi->ci.method == Z_BZIP2ED) && (!zi->ci.raw))
-#else
-    if ((err==ZIP_OK) && (zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
-#endif
-    {
-        if(zi->ci.method == Z_DEFLATED)
-        {
-          zi->ci.stream.zalloc = (alloc_func)0;
-          zi->ci.stream.zfree = (free_func)0;
-          zi->ci.stream.opaque = (voidpf)0;
-
-          if (windowBits>0)
-              windowBits = -windowBits;
-
-          err = deflateInit2(&zi->ci.stream, level, Z_DEFLATED, windowBits, memLevel, strategy);
-
-          if (err==Z_OK)
-              zi->ci.stream_initialised = Z_DEFLATED;
-        }
-        else if(zi->ci.method == Z_BZIP2ED)
-        {
-#ifdef HAVE_BZIP2
-            // Init BZip stuff here
-          zi->ci.bstream.bzalloc = 0;
-          zi->ci.bstream.bzfree = 0;
-          zi->ci.bstream.opaque = (voidpf)0;
-
-          err = BZ2_bzCompressInit(&zi->ci.bstream, level, 0,35);
-          if(err == BZ_OK)
-            zi->ci.stream_initialised = Z_BZIP2ED;
-#endif
-        }
-
-    }
-
-#    ifndef NOCRYPT
-    zi->ci.crypt_header_size = 0;
-    if ((err==Z_OK) && (password != NULL))
-    {
-        unsigned char bufHead[RAND_HEAD_LEN];
-        unsigned int sizeHead;
-        zi->ci.encrypt = 1;
-        zi->ci.pcrc_32_tab = get_crc_table();
-        /*init_keys(password,zi->ci.keys,zi->ci.pcrc_32_tab);*/
-
-        sizeHead=crypthead(password,bufHead,RAND_HEAD_LEN,zi->ci.keys,zi->ci.pcrc_32_tab,crcForCrypting);
-        zi->ci.crypt_header_size = sizeHead;
-
-        if (ZWRITE64(zi->z_filefunc,zi->filestream,bufHead,sizeHead) != sizeHead)
-                err = ZIP_ERRNO;
-    }
-#    endif
-
-    if (err==Z_OK)
-        zi->in_opened_file_inzip = 1;
-    return err;
-}
-
-extern int ZEXPORT zipOpenNewFileInZip4 (zipFile file, const char* filename, const zip_fileinfo* zipfi,
-                                         const void* extrafield_local, uInt size_extrafield_local,
-                                         const void* extrafield_global, uInt size_extrafield_global,
-                                         const char* comment, int method, int level, int raw,
-                                         int windowBits,int memLevel, int strategy,
-                                         const char* password, uLong crcForCrypting,
-                                         uLong versionMadeBy, uLong flagBase)
-{
-    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
-                                 extrafield_local, size_extrafield_local,
-                                 extrafield_global, size_extrafield_global,
-                                 comment, method, level, raw,
-                                 windowBits, memLevel, strategy,
-                                 password, crcForCrypting, versionMadeBy, flagBase, 0);
-}
-
-extern int ZEXPORT zipOpenNewFileInZip3 (zipFile file, const char* filename, const zip_fileinfo* zipfi,
-                                         const void* extrafield_local, uInt size_extrafield_local,
-                                         const void* extrafield_global, uInt size_extrafield_global,
-                                         const char* comment, int method, int level, int raw,
-                                         int windowBits,int memLevel, int strategy,
-                                         const char* password, uLong crcForCrypting)
-{
-    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
-                                 extrafield_local, size_extrafield_local,
-                                 extrafield_global, size_extrafield_global,
-                                 comment, method, level, raw,
-                                 windowBits, memLevel, strategy,
-                                 password, crcForCrypting, VERSIONMADEBY, 0, 0);
-}
-
-extern int ZEXPORT zipOpenNewFileInZip3_64(zipFile file, const char* filename, const zip_fileinfo* zipfi,
-                                         const void* extrafield_local, uInt size_extrafield_local,
-                                         const void* extrafield_global, uInt size_extrafield_global,
-                                         const char* comment, int method, int level, int raw,
-                                         int windowBits,int memLevel, int strategy,
-                                         const char* password, uLong crcForCrypting, int zip64)
-{
-    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
-                                 extrafield_local, size_extrafield_local,
-                                 extrafield_global, size_extrafield_global,
-                                 comment, method, level, raw,
-                                 windowBits, memLevel, strategy,
-                                 password, crcForCrypting, VERSIONMADEBY, 0, zip64);
-}
-
-extern int ZEXPORT zipOpenNewFileInZip2(zipFile file, const char* filename, const zip_fileinfo* zipfi,
-                                        const void* extrafield_local, uInt size_extrafield_local,
-                                        const void* extrafield_global, uInt size_extrafield_global,
-                                        const char* comment, int method, int level, int raw)
-{
-    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
-                                 extrafield_local, size_extrafield_local,
-                                 extrafield_global, size_extrafield_global,
-                                 comment, method, level, raw,
-                                 -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
-                                 NULL, 0, VERSIONMADEBY, 0, 0);
-}
-
-extern int ZEXPORT zipOpenNewFileInZip2_64(zipFile file, const char* filename, const zip_fileinfo* zipfi,
-                                        const void* extrafield_local, uInt size_extrafield_local,
-                                        const void* extrafield_global, uInt size_extrafield_global,
-                                        const char* comment, int method, int level, int raw, int zip64)
-{
-    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
-                                 extrafield_local, size_extrafield_local,
-                                 extrafield_global, size_extrafield_global,
-                                 comment, method, level, raw,
-                                 -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
-                                 NULL, 0, VERSIONMADEBY, 0, zip64);
-}
-
-extern int ZEXPORT zipOpenNewFileInZip64 (zipFile file, const char* filename, const zip_fileinfo* zipfi,
-                                        const void* extrafield_local, uInt size_extrafield_local,
-                                        const void*extrafield_global, uInt size_extrafield_global,
-                                        const char* comment, int method, int level, int zip64)
-{
-    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
-                                 extrafield_local, size_extrafield_local,
-                                 extrafield_global, size_extrafield_global,
-                                 comment, method, level, 0,
-                                 -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
-                                 NULL, 0, VERSIONMADEBY, 0, zip64);
-}
-
-extern int ZEXPORT zipOpenNewFileInZip (zipFile file, const char* filename, const zip_fileinfo* zipfi,
-                                        const void* extrafield_local, uInt size_extrafield_local,
-                                        const void*extrafield_global, uInt size_extrafield_global,
-                                        const char* comment, int method, int level)
-{
-    return zipOpenNewFileInZip4_64 (file, filename, zipfi,
-                                 extrafield_local, size_extrafield_local,
-                                 extrafield_global, size_extrafield_global,
-                                 comment, method, level, 0,
-                                 -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
-                                 NULL, 0, VERSIONMADEBY, 0, 0);
-}
-
-local int zip64FlushWriteBuffer(zip64_internal* zi)
-{
-    int err=ZIP_OK;
-
-    if (zi->ci.encrypt != 0)
-    {
-#ifndef NOCRYPT
-        uInt i;
-        int t;
-        for (i=0;i<zi->ci.pos_in_buffered_data;i++)
-            zi->ci.buffered_data[i] = zencode(zi->ci.keys, zi->ci.pcrc_32_tab, zi->ci.buffered_data[i],t);
-#endif
-    }
-
-    if (ZWRITE64(zi->z_filefunc,zi->filestream,zi->ci.buffered_data,zi->ci.pos_in_buffered_data) != zi->ci.pos_in_buffered_data)
-      err = ZIP_ERRNO;
-
-    zi->ci.totalCompressedData += zi->ci.pos_in_buffered_data;
-
-#ifdef HAVE_BZIP2
-    if(zi->ci.method == Z_BZIP2ED)
-    {
-      zi->ci.totalUncompressedData += zi->ci.bstream.total_in_lo32;
-      zi->ci.bstream.total_in_lo32 = 0;
-      zi->ci.bstream.total_in_hi32 = 0;
-    }
-    else
-#endif
-    {
-      zi->ci.totalUncompressedData += zi->ci.stream.total_in;
-      zi->ci.stream.total_in = 0;
-    }
-
-
-    zi->ci.pos_in_buffered_data = 0;
-
-    return err;
-}
-
-extern int ZEXPORT zipWriteInFileInZip (zipFile file,const void* buf,unsigned int len)
-{
-    zip64_internal* zi;
-    int err=ZIP_OK;
-
-    if (file == NULL)
-        return ZIP_PARAMERROR;
-    zi = (zip64_internal*)file;
-
-    if (zi->in_opened_file_inzip == 0)
-        return ZIP_PARAMERROR;
-
-    zi->ci.crc32 = crc32(zi->ci.crc32,buf,(uInt)len);
-
-#ifdef HAVE_BZIP2
-    if(zi->ci.method == Z_BZIP2ED && (!zi->ci.raw))
-    {
-      zi->ci.bstream.next_in = (void*)buf;
-      zi->ci.bstream.avail_in = len;
-      err = BZ_RUN_OK;
-
-      while ((err==BZ_RUN_OK) && (zi->ci.bstream.avail_in>0))
-      {
-        if (zi->ci.bstream.avail_out == 0)
-        {
-          if (zip64FlushWriteBuffer(zi) == ZIP_ERRNO)
-            err = ZIP_ERRNO;
-          zi->ci.bstream.avail_out = (uInt)Z_BUFSIZE;
-          zi->ci.bstream.next_out = (char*)zi->ci.buffered_data;
-        }
-
-
-        if(err != BZ_RUN_OK)
-          break;
-
-        if ((zi->ci.method == Z_BZIP2ED) && (!zi->ci.raw))
-        {
-          uLong uTotalOutBefore_lo = zi->ci.bstream.total_out_lo32;
-//          uLong uTotalOutBefore_hi = zi->ci.bstream.total_out_hi32;
-          err=BZ2_bzCompress(&zi->ci.bstream,  BZ_RUN);
-
-          zi->ci.pos_in_buffered_data += (uInt)(zi->ci.bstream.total_out_lo32 - uTotalOutBefore_lo) ;
-        }
-      }
-
-      if(err == BZ_RUN_OK)
-        err = ZIP_OK;
-    }
-    else
-#endif
-    {
-      zi->ci.stream.next_in = (Bytef*)buf;
-      zi->ci.stream.avail_in = len;
-
-      while ((err==ZIP_OK) && (zi->ci.stream.avail_in>0))
-      {
-          if (zi->ci.stream.avail_out == 0)
-          {
-              if (zip64FlushWriteBuffer(zi) == ZIP_ERRNO)
-                  err = ZIP_ERRNO;
-              zi->ci.stream.avail_out = (uInt)Z_BUFSIZE;
-              zi->ci.stream.next_out = zi->ci.buffered_data;
-          }
-
-
-          if(err != ZIP_OK)
-              break;
-
-          if ((zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
-          {
-              uLong uTotalOutBefore = zi->ci.stream.total_out;
-              err=deflate(&zi->ci.stream,  Z_NO_FLUSH);
-              if(uTotalOutBefore > zi->ci.stream.total_out)
-              {
-                int bBreak = 0;
-                bBreak++;
-              }
-
-              zi->ci.pos_in_buffered_data += (uInt)(zi->ci.stream.total_out - uTotalOutBefore) ;
-          }
-          else
-          {
-              uInt copy_this,i;
-              if (zi->ci.stream.avail_in < zi->ci.stream.avail_out)
-                  copy_this = zi->ci.stream.avail_in;
-              else
-                  copy_this = zi->ci.stream.avail_out;
-
-              for (i = 0; i < copy_this; i++)
-                  *(((char*)zi->ci.stream.next_out)+i) =
-                      *(((const char*)zi->ci.stream.next_in)+i);
-              {
-                  zi->ci.stream.avail_in -= copy_this;
-                  zi->ci.stream.avail_out-= copy_this;
-                  zi->ci.stream.next_in+= copy_this;
-                  zi->ci.stream.next_out+= copy_this;
-                  zi->ci.stream.total_in+= copy_this;
-                  zi->ci.stream.total_out+= copy_this;
-                  zi->ci.pos_in_buffered_data += copy_this;
-              }
-          }
-      }// while(...)
-    }
-
-    return err;
-}
-
-extern int ZEXPORT zipCloseFileInZipRaw (zipFile file, uLong uncompressed_size, uLong crc32)
-{
-    return zipCloseFileInZipRaw64 (file, uncompressed_size, crc32);
-}
-
-extern int ZEXPORT zipCloseFileInZipRaw64 (zipFile file, ZPOS64_T uncompressed_size, uLong crc32)
-{
-    zip64_internal* zi;
-    ZPOS64_T compressed_size;
-    uLong invalidValue = 0xffffffff;
-    short datasize = 0;
-    int err=ZIP_OK;
-
-    if (file == NULL)
-        return ZIP_PARAMERROR;
-    zi = (zip64_internal*)file;
-
-    if (zi->in_opened_file_inzip == 0)
-        return ZIP_PARAMERROR;
-    zi->ci.stream.avail_in = 0;
-
-    if ((zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
-                {
-                        while (err==ZIP_OK)
-                        {
-                                uLong uTotalOutBefore;
-                                if (zi->ci.stream.avail_out == 0)
-                                {
-                                        if (zip64FlushWriteBuffer(zi) == ZIP_ERRNO)
-                                                err = ZIP_ERRNO;
-                                        zi->ci.stream.avail_out = (uInt)Z_BUFSIZE;
-                                        zi->ci.stream.next_out = zi->ci.buffered_data;
-                                }
-                                uTotalOutBefore = zi->ci.stream.total_out;
-                                err=deflate(&zi->ci.stream,  Z_FINISH);
-                                zi->ci.pos_in_buffered_data += (uInt)(zi->ci.stream.total_out - uTotalOutBefore) ;
-                        }
-                }
-    else if ((zi->ci.method == Z_BZIP2ED) && (!zi->ci.raw))
-    {
-#ifdef HAVE_BZIP2
-      err = BZ_FINISH_OK;
-      while (err==BZ_FINISH_OK)
-      {
-        uLong uTotalOutBefore;
-        if (zi->ci.bstream.avail_out == 0)
-        {
-          if (zip64FlushWriteBuffer(zi) == ZIP_ERRNO)
-            err = ZIP_ERRNO;
-          zi->ci.bstream.avail_out = (uInt)Z_BUFSIZE;
-          zi->ci.bstream.next_out = (char*)zi->ci.buffered_data;
-        }
-        uTotalOutBefore = zi->ci.bstream.total_out_lo32;
-        err=BZ2_bzCompress(&zi->ci.bstream,  BZ_FINISH);
-        if(err == BZ_STREAM_END)
-          err = Z_STREAM_END;
-
-        zi->ci.pos_in_buffered_data += (uInt)(zi->ci.bstream.total_out_lo32 - uTotalOutBefore);
-      }
-
-      if(err == BZ_FINISH_OK)
-        err = ZIP_OK;
-#endif
-    }
-
-    if (err==Z_STREAM_END)
-        err=ZIP_OK; /* this is normal */
-
-    if ((zi->ci.pos_in_buffered_data>0) && (err==ZIP_OK))
-                {
-        if (zip64FlushWriteBuffer(zi)==ZIP_ERRNO)
-            err = ZIP_ERRNO;
-                }
-
-    if ((zi->ci.method == Z_DEFLATED) && (!zi->ci.raw))
-    {
-        int tmp_err = deflateEnd(&zi->ci.stream);
-        if (err == ZIP_OK)
-            err = tmp_err;
-        zi->ci.stream_initialised = 0;
-    }
-#ifdef HAVE_BZIP2
-    else if((zi->ci.method == Z_BZIP2ED) && (!zi->ci.raw))
-    {
-      int tmperr = BZ2_bzCompressEnd(&zi->ci.bstream);
-                        if (err==ZIP_OK)
-                                err = tmperr;
-                        zi->ci.stream_initialised = 0;
-    }
-#endif
-
-    if (!zi->ci.raw)
-    {
-        crc32 = (uLong)zi->ci.crc32;
-        uncompressed_size = zi->ci.totalUncompressedData;
-    }
-    compressed_size = zi->ci.totalCompressedData;
-
-#    ifndef NOCRYPT
-    compressed_size += zi->ci.crypt_header_size;
-#    endif
-
-    // update Current Item crc and sizes,
-    if(compressed_size >= 0xffffffff || uncompressed_size >= 0xffffffff || zi->ci.pos_local_header >= 0xffffffff)
-    {
-      /*version Made by*/
-      zip64local_putValue_inmemory(zi->ci.central_header+4,(uLong)45,2);
-      /*version needed*/
-      zip64local_putValue_inmemory(zi->ci.central_header+6,(uLong)45,2);
-
-    }
-
-    zip64local_putValue_inmemory(zi->ci.central_header+16,crc32,4); /*crc*/
-
-
-    if(compressed_size >= 0xffffffff)
-      zip64local_putValue_inmemory(zi->ci.central_header+20, invalidValue,4); /*compr size*/
-    else
-      zip64local_putValue_inmemory(zi->ci.central_header+20, compressed_size,4); /*compr size*/
-
-    /// set internal file attributes field
-    if (zi->ci.stream.data_type == Z_ASCII)
-        zip64local_putValue_inmemory(zi->ci.central_header+36,(uLong)Z_ASCII,2);
-
-    if(uncompressed_size >= 0xffffffff)
-      zip64local_putValue_inmemory(zi->ci.central_header+24, invalidValue,4); /*uncompr size*/
-    else
-      zip64local_putValue_inmemory(zi->ci.central_header+24, uncompressed_size,4); /*uncompr size*/
-
-    // Add ZIP64 extra info field for uncompressed size
-    if(uncompressed_size >= 0xffffffff)
-      datasize += 8;
-
-    // Add ZIP64 extra info field for compressed size
-    if(compressed_size >= 0xffffffff)
-      datasize += 8;
-
-    // Add ZIP64 extra info field for relative offset to local file header of current file
-    if(zi->ci.pos_local_header >= 0xffffffff)
-      datasize += 8;
-
-    if(datasize > 0)
-    {
-      char* p = NULL;
-
-      if((uLong)(datasize + 4) > zi->ci.size_centralExtraFree)
-      {
-        // we can not write more data to the buffer that we have room for.
-        return ZIP_BADZIPFILE;
-      }
-
-      p = zi->ci.central_header + zi->ci.size_centralheader;
-
-      // Add Extra Information Header for 'ZIP64 information'
-      zip64local_putValue_inmemory(p, 0x0001, 2); // HeaderID
-      p += 2;
-      zip64local_putValue_inmemory(p, datasize, 2); // DataSize
-      p += 2;
-
-      if(uncompressed_size >= 0xffffffff)
-      {
-        zip64local_putValue_inmemory(p, uncompressed_size, 8);
-        p += 8;
-      }
-
-      if(compressed_size >= 0xffffffff)
-      {
-        zip64local_putValue_inmemory(p, compressed_size, 8);
-        p += 8;
-      }
-
-      if(zi->ci.pos_local_header >= 0xffffffff)
-      {
-        zip64local_putValue_inmemory(p, zi->ci.pos_local_header, 8);
-        p += 8;
-      }
-
-      // Update how much extra free space we got in the memory buffer
-      // and increase the centralheader size so the new ZIP64 fields are included
-      // ( 4 below is the size of HeaderID and DataSize field )
-      zi->ci.size_centralExtraFree -= datasize + 4;
-      zi->ci.size_centralheader += datasize + 4;
-
-      // Update the extra info size field
-      zi->ci.size_centralExtra += datasize + 4;
-      zip64local_putValue_inmemory(zi->ci.central_header+30,(uLong)zi->ci.size_centralExtra,2);
-    }
-
-    if (err==ZIP_OK)
-        err = add_data_in_datablock(&zi->central_dir, zi->ci.central_header, (uLong)zi->ci.size_centralheader);
-
-    free(zi->ci.central_header);
-
-    if (err==ZIP_OK)
-    {
-        // Update the LocalFileHeader with the new values.
-
-        ZPOS64_T cur_pos_inzip = ZTELL64(zi->z_filefunc,zi->filestream);
-
-        if (ZSEEK64(zi->z_filefunc,zi->filestream, zi->ci.pos_local_header + 14,ZLIB_FILEFUNC_SEEK_SET)!=0)
-            err = ZIP_ERRNO;
-
-        if (err==ZIP_OK)
-            err = zip64local_putValue(&zi->z_filefunc,zi->filestream,crc32,4); /* crc 32, unknown */
-
-        if(uncompressed_size >= 0xffffffff || compressed_size >= 0xffffffff )
-        {
-          if(zi->ci.pos_zip64extrainfo > 0)
-          {
-            // Update the size in the ZIP64 extended field.
-            if (ZSEEK64(zi->z_filefunc,zi->filestream, zi->ci.pos_zip64extrainfo + 4,ZLIB_FILEFUNC_SEEK_SET)!=0)
-              err = ZIP_ERRNO;
-
-            if (err==ZIP_OK) /* compressed size, unknown */
-              err = zip64local_putValue(&zi->z_filefunc, zi->filestream, uncompressed_size, 8);
-
-            if (err==ZIP_OK) /* uncompressed size, unknown */
-              err = zip64local_putValue(&zi->z_filefunc, zi->filestream, compressed_size, 8);
-          }
-          else
-              err = ZIP_BADZIPFILE; // Caller passed zip64 = 0, so no room for zip64 info -> fatal
-        }
-        else
-        {
-          if (err==ZIP_OK) /* compressed size, unknown */
-              err = zip64local_putValue(&zi->z_filefunc,zi->filestream,compressed_size,4);
-
-          if (err==ZIP_OK) /* uncompressed size, unknown */
-              err = zip64local_putValue(&zi->z_filefunc,zi->filestream,uncompressed_size,4);
-        }
-
-        if (ZSEEK64(zi->z_filefunc,zi->filestream, cur_pos_inzip,ZLIB_FILEFUNC_SEEK_SET)!=0)
-            err = ZIP_ERRNO;
-    }
-
-    zi->number_entry ++;
-    zi->in_opened_file_inzip = 0;
-
-    return err;
-}
-
-extern int ZEXPORT zipCloseFileInZip (zipFile file)
-{
-    return zipCloseFileInZipRaw (file,0,0);
-}
-
-int Write_Zip64EndOfCentralDirectoryLocator(zip64_internal* zi, ZPOS64_T zip64eocd_pos_inzip)
-{
-  int err = ZIP_OK;
-  ZPOS64_T pos = zip64eocd_pos_inzip - zi->add_position_when_writing_offset;
-
-  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)ZIP64ENDLOCHEADERMAGIC,4);
-
-  /*num disks*/
-    if (err==ZIP_OK) /* number of the disk with the start of the central directory */
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4);
-
-  /*relative offset*/
-    if (err==ZIP_OK) /* Relative offset to the Zip64EndOfCentralDirectory */
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream, pos,8);
-
-  /*total disks*/ /* Do not support spawning of disk so always say 1 here*/
-    if (err==ZIP_OK) /* number of the disk with the start of the central directory */
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)1,4);
-
-    return err;
-}
-
-int Write_Zip64EndOfCentralDirectoryRecord(zip64_internal* zi, uLong size_centraldir, ZPOS64_T centraldir_pos_inzip)
-{
-  int err = ZIP_OK;
-
-  uLong Zip64DataSize = 44;
-
-  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)ZIP64ENDHEADERMAGIC,4);
-
-  if (err==ZIP_OK) /* size of this 'zip64 end of central directory' */
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(ZPOS64_T)Zip64DataSize,8); // why ZPOS64_T of this ?
-
-  if (err==ZIP_OK) /* version made by */
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)45,2);
-
-  if (err==ZIP_OK) /* version needed */
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)45,2);
-
-  if (err==ZIP_OK) /* number of this disk */
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4);
-
-  if (err==ZIP_OK) /* number of the disk with the start of the central directory */
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,4);
-
-  if (err==ZIP_OK) /* total number of entries in the central dir on this disk */
-    err = zip64local_putValue(&zi->z_filefunc, zi->filestream, zi->number_entry, 8);
-
-  if (err==ZIP_OK) /* total number of entries in the central dir */
-    err = zip64local_putValue(&zi->z_filefunc, zi->filestream, zi->number_entry, 8);
-
-  if (err==ZIP_OK) /* size of the central directory */
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(ZPOS64_T)size_centraldir,8);
-
-  if (err==ZIP_OK) /* offset of start of central directory with respect to the starting disk number */
-  {
-    ZPOS64_T pos = centraldir_pos_inzip - zi->add_position_when_writing_offset;
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream, (ZPOS64_T)pos,8);
-  }
-  return err;
-}
-int Write_EndOfCentralDirectoryRecord(zip64_internal* zi, uLong size_centraldir, ZPOS64_T centraldir_pos_inzip)
-{
-  int err = ZIP_OK;
-
-  /*signature*/
-  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)ENDHEADERMAGIC,4);
-
-  if (err==ZIP_OK) /* number of this disk */
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,2);
-
-  if (err==ZIP_OK) /* number of the disk with the start of the central directory */
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0,2);
-
-  if (err==ZIP_OK) /* total number of entries in the central dir on this disk */
-  {
-    {
-      if(zi->number_entry >= 0xFFFF)
-        err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xffff,2); // use value in ZIP64 record
-      else
-        err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->number_entry,2);
-    }
-  }
-
-  if (err==ZIP_OK) /* total number of entries in the central dir */
-  {
-    if(zi->number_entry >= 0xFFFF)
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)0xffff,2); // use value in ZIP64 record
-    else
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)zi->number_entry,2);
-  }
-
-  if (err==ZIP_OK) /* size of the central directory */
-    err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_centraldir,4);
-
-  if (err==ZIP_OK) /* offset of start of central directory with respect to the starting disk number */
-  {
-    ZPOS64_T pos = centraldir_pos_inzip - zi->add_position_when_writing_offset;
-    if(pos >= 0xffffffff)
-    {
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream, (uLong)0xffffffff,4);
-    }
-    else
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream, (uLong)(centraldir_pos_inzip - zi->add_position_when_writing_offset),4);
-  }
-
-   return err;
-}
-
-int Write_GlobalComment(zip64_internal* zi, const char* global_comment)
-{
-  int err = ZIP_OK;
-  uInt size_global_comment = 0;
-
-  if(global_comment != NULL)
-    size_global_comment = (uInt)strlen(global_comment);
-
-  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)size_global_comment,2);
-
-  if (err == ZIP_OK && size_global_comment > 0)
-  {
-    if (ZWRITE64(zi->z_filefunc,zi->filestream, global_comment, size_global_comment) != size_global_comment)
-      err = ZIP_ERRNO;
-  }
-  return err;
-}
-
-extern int ZEXPORT zipClose (zipFile file, const char* global_comment)
-{
-    zip64_internal* zi;
-    int err = 0;
-    uLong size_centraldir = 0;
-    ZPOS64_T centraldir_pos_inzip;
-    ZPOS64_T pos;
-
-    if (file == NULL)
-        return ZIP_PARAMERROR;
-
-    zi = (zip64_internal*)file;
-
-    if (zi->in_opened_file_inzip == 1)
-    {
-        err = zipCloseFileInZip (file);
-    }
-
-#ifndef NO_ADDFILEINEXISTINGZIP
-    if (global_comment==NULL)
-        global_comment = zi->globalcomment;
-#endif
-
-    centraldir_pos_inzip = ZTELL64(zi->z_filefunc,zi->filestream);
-
-    if (err==ZIP_OK)
-    {
-        linkedlist_datablock_internal* ldi = zi->central_dir.first_block;
-        while (ldi!=NULL)
-        {
-            if ((err==ZIP_OK) && (ldi->filled_in_this_block>0))
-            {
-                if (ZWRITE64(zi->z_filefunc,zi->filestream, ldi->data, ldi->filled_in_this_block) != ldi->filled_in_this_block)
-                    err = ZIP_ERRNO;
-            }
-
-            size_centraldir += ldi->filled_in_this_block;
-            ldi = ldi->next_datablock;
-        }
-    }
-    free_linkedlist(&(zi->central_dir));
-
-    pos = centraldir_pos_inzip - zi->add_position_when_writing_offset;
-    if(pos >= 0xffffffff || zi->number_entry > 0xFFFF)
-    {
-      ZPOS64_T Zip64EOCDpos = ZTELL64(zi->z_filefunc,zi->filestream);
-      Write_Zip64EndOfCentralDirectoryRecord(zi, size_centraldir, centraldir_pos_inzip);
-
-      Write_Zip64EndOfCentralDirectoryLocator(zi, Zip64EOCDpos);
-    }
-
-    if (err==ZIP_OK)
-      err = Write_EndOfCentralDirectoryRecord(zi, size_centraldir, centraldir_pos_inzip);
-
-    if(err == ZIP_OK)
-      err = Write_GlobalComment(zi, global_comment);
-
-    if (ZCLOSE64(zi->z_filefunc,zi->filestream) != 0)
-        if (err == ZIP_OK)
-            err = ZIP_ERRNO;
-
-#ifndef NO_ADDFILEINEXISTINGZIP
-    TRYFREE(zi->globalcomment);
-#endif
-    TRYFREE(zi);
-
-    return err;
-}
-
-extern int ZEXPORT zipRemoveExtraInfoBlock (char* pData, int* dataLen, short sHeader)
-{
-  char* p = pData;
-  int size = 0;
-  char* pNewHeader;
-  char* pTmp;
-  short header;
-  short dataSize;
-
-  int retVal = ZIP_OK;
-
-  if(pData == NULL || *dataLen < 4)
-    return ZIP_PARAMERROR;
-
-  pNewHeader = (char*)ALLOC(*dataLen);
-  pTmp = pNewHeader;
-
-  while(p < (pData + *dataLen))
-  {
-    header = *(short*)p;
-    dataSize = *(((short*)p)+1);
-
-    if( header == sHeader ) // Header found.
-    {
-      p += dataSize + 4; // skip it. do not copy to temp buffer
-    }
-    else
-    {
-      // Extra Info block should not be removed, So copy it to the temp buffer.
-      memcpy(pTmp, p, dataSize + 4);
-      p += dataSize + 4;
-      size += dataSize + 4;
-    }
-
-  }
-
-  if(size < *dataLen)
-  {
-    // clean old extra info block.
-    memset(pData,0, *dataLen);
-
-    // copy the new extra info block over the old
-    if(size > 0)
-      memcpy(pData, pNewHeader, size);
-
-    // set the new extra info size
-    *dataLen = size;
-
-    retVal = ZIP_OK;
-  }
-  else
-    retVal = ZIP_ERRNO;
-
-  TRYFREE(pNewHeader);
-
-  return retVal;
-}
diff --git a/src/png/zlib/contrib/minizip/zip.h b/src/png/zlib/contrib/minizip/zip.h
deleted file mode 100644
index 8aaebb623..000000000
--- a/src/png/zlib/contrib/minizip/zip.h
+++ /dev/null
@@ -1,362 +0,0 @@
-/* zip.h -- IO on .zip files using zlib
-   Version 1.1, February 14h, 2010
-   part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )
-
-         Modifications for Zip64 support
-         Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )
-
-         For more info read MiniZip_info.txt
-
-         ---------------------------------------------------------------------------
-
-   Condition of use and distribution are the same than zlib :
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the authors be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-
-        ---------------------------------------------------------------------------
-
-        Changes
-
-        See header of zip.h
-
-*/
-
-#ifndef _zip12_H
-#define _zip12_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-//#define HAVE_BZIP2
-
-#ifndef _ZLIB_H
-#include "zlib.h"
-#endif
-
-#ifndef _ZLIBIOAPI_H
-#include "ioapi.h"
-#endif
-
-#ifdef HAVE_BZIP2
-#include "bzlib.h"
-#endif
-
-#define Z_BZIP2ED 12
-
-#if defined(STRICTZIP) || defined(STRICTZIPUNZIP)
-/* like the STRICT of WIN32, we define a pointer that cannot be converted
-    from (void*) without cast */
-typedef struct TagzipFile__ { int unused; } zipFile__;
-typedef zipFile__ *zipFile;
-#else
-typedef voidp zipFile;
-#endif
-
-#define ZIP_OK                          (0)
-#define ZIP_EOF                         (0)
-#define ZIP_ERRNO                       (Z_ERRNO)
-#define ZIP_PARAMERROR                  (-102)
-#define ZIP_BADZIPFILE                  (-103)
-#define ZIP_INTERNALERROR               (-104)
-
-#ifndef DEF_MEM_LEVEL
-#  if MAX_MEM_LEVEL >= 8
-#    define DEF_MEM_LEVEL 8
-#  else
-#    define DEF_MEM_LEVEL  MAX_MEM_LEVEL
-#  endif
-#endif
-/* default memLevel */
-
-/* tm_zip contain date/time info */
-typedef struct tm_zip_s
-{
-    uInt tm_sec;            /* seconds after the minute - [0,59] */
-    uInt tm_min;            /* minutes after the hour - [0,59] */
-    uInt tm_hour;           /* hours since midnight - [0,23] */
-    uInt tm_mday;           /* day of the month - [1,31] */
-    uInt tm_mon;            /* months since January - [0,11] */
-    uInt tm_year;           /* years - [1980..2044] */
-} tm_zip;
-
-typedef struct
-{
-    tm_zip      tmz_date;       /* date in understandable format           */
-    uLong       dosDate;       /* if dos_date == 0, tmu_date is used      */
-/*    uLong       flag;        */   /* general purpose bit flag        2 bytes */
-
-    uLong       internal_fa;    /* internal file attributes        2 bytes */
-    uLong       external_fa;    /* external file attributes        4 bytes */
-} zip_fileinfo;
-
-typedef const char* zipcharpc;
-
-
-#define APPEND_STATUS_CREATE        (0)
-#define APPEND_STATUS_CREATEAFTER   (1)
-#define APPEND_STATUS_ADDINZIP      (2)
-
-extern zipFile ZEXPORT zipOpen OF((const char *pathname, int append));
-extern zipFile ZEXPORT zipOpen64 OF((const void *pathname, int append));
-/*
-  Create a zipfile.
-     pathname contain on Windows XP a filename like "c:\\zlib\\zlib113.zip" or on
-       an Unix computer "zlib/zlib113.zip".
-     if the file pathname exist and append==APPEND_STATUS_CREATEAFTER, the zip
-       will be created at the end of the file.
-         (useful if the file contain a self extractor code)
-     if the file pathname exist and append==APPEND_STATUS_ADDINZIP, we will
-       add files in existing zip (be sure you don't add file that doesn't exist)
-     If the zipfile cannot be opened, the return value is NULL.
-     Else, the return value is a zipFile Handle, usable with other function
-       of this zip package.
-*/
-
-/* Note : there is no delete function into a zipfile.
-   If you want delete file into a zipfile, you must open a zipfile, and create another
-   Of couse, you can use RAW reading and writing to copy the file you did not want delte
-*/
-
-extern zipFile ZEXPORT zipOpen2 OF((const char *pathname,
-                                   int append,
-                                   zipcharpc* globalcomment,
-                                   zlib_filefunc_def* pzlib_filefunc_def));
-
-extern zipFile ZEXPORT zipOpen2_64 OF((const void *pathname,
-                                   int append,
-                                   zipcharpc* globalcomment,
-                                   zlib_filefunc64_def* pzlib_filefunc_def));
-
-extern int ZEXPORT zipOpenNewFileInZip OF((zipFile file,
-                       const char* filename,
-                       const zip_fileinfo* zipfi,
-                       const void* extrafield_local,
-                       uInt size_extrafield_local,
-                       const void* extrafield_global,
-                       uInt size_extrafield_global,
-                       const char* comment,
-                       int method,
-                       int level));
-
-extern int ZEXPORT zipOpenNewFileInZip64 OF((zipFile file,
-                       const char* filename,
-                       const zip_fileinfo* zipfi,
-                       const void* extrafield_local,
-                       uInt size_extrafield_local,
-                       const void* extrafield_global,
-                       uInt size_extrafield_global,
-                       const char* comment,
-                       int method,
-                       int level,
-                       int zip64));
-
-/*
-  Open a file in the ZIP for writing.
-  filename : the filename in zip (if NULL, '-' without quote will be used
-  *zipfi contain supplemental information
-  if extrafield_local!=NULL and size_extrafield_local>0, extrafield_local
-    contains the extrafield data the the local header
-  if extrafield_global!=NULL and size_extrafield_global>0, extrafield_global
-    contains the extrafield data the the local header
-  if comment != NULL, comment contain the comment string
-  method contain the compression method (0 for store, Z_DEFLATED for deflate)
-  level contain the level of compression (can be Z_DEFAULT_COMPRESSION)
-  zip64 is set to 1 if a zip64 extended information block should be added to the local file header.
-                    this MUST be '1' if the uncompressed size is >= 0xffffffff.
-
-*/
-
-
-extern int ZEXPORT zipOpenNewFileInZip2 OF((zipFile file,
-                                            const char* filename,
-                                            const zip_fileinfo* zipfi,
-                                            const void* extrafield_local,
-                                            uInt size_extrafield_local,
-                                            const void* extrafield_global,
-                                            uInt size_extrafield_global,
-                                            const char* comment,
-                                            int method,
-                                            int level,
-                                            int raw));
-
-
-extern int ZEXPORT zipOpenNewFileInZip2_64 OF((zipFile file,
-                                            const char* filename,
-                                            const zip_fileinfo* zipfi,
-                                            const void* extrafield_local,
-                                            uInt size_extrafield_local,
-                                            const void* extrafield_global,
-                                            uInt size_extrafield_global,
-                                            const char* comment,
-                                            int method,
-                                            int level,
-                                            int raw,
-                                            int zip64));
-/*
-  Same than zipOpenNewFileInZip, except if raw=1, we write raw file
- */
-
-extern int ZEXPORT zipOpenNewFileInZip3 OF((zipFile file,
-                                            const char* filename,
-                                            const zip_fileinfo* zipfi,
-                                            const void* extrafield_local,
-                                            uInt size_extrafield_local,
-                                            const void* extrafield_global,
-                                            uInt size_extrafield_global,
-                                            const char* comment,
-                                            int method,
-                                            int level,
-                                            int raw,
-                                            int windowBits,
-                                            int memLevel,
-                                            int strategy,
-                                            const char* password,
-                                            uLong crcForCrypting));
-
-extern int ZEXPORT zipOpenNewFileInZip3_64 OF((zipFile file,
-                                            const char* filename,
-                                            const zip_fileinfo* zipfi,
-                                            const void* extrafield_local,
-                                            uInt size_extrafield_local,
-                                            const void* extrafield_global,
-                                            uInt size_extrafield_global,
-                                            const char* comment,
-                                            int method,
-                                            int level,
-                                            int raw,
-                                            int windowBits,
-                                            int memLevel,
-                                            int strategy,
-                                            const char* password,
-                                            uLong crcForCrypting,
-                                            int zip64
-                                            ));
-
-/*
-  Same than zipOpenNewFileInZip2, except
-    windowBits,memLevel,,strategy : see parameter strategy in deflateInit2
-    password : crypting password (NULL for no crypting)
-    crcForCrypting : crc of file to compress (needed for crypting)
- */
-
-extern int ZEXPORT zipOpenNewFileInZip4 OF((zipFile file,
-                                            const char* filename,
-                                            const zip_fileinfo* zipfi,
-                                            const void* extrafield_local,
-                                            uInt size_extrafield_local,
-                                            const void* extrafield_global,
-                                            uInt size_extrafield_global,
-                                            const char* comment,
-                                            int method,
-                                            int level,
-                                            int raw,
-                                            int windowBits,
-                                            int memLevel,
-                                            int strategy,
-                                            const char* password,
-                                            uLong crcForCrypting,
-                                            uLong versionMadeBy,
-                                            uLong flagBase
-                                            ));
-
-
-extern int ZEXPORT zipOpenNewFileInZip4_64 OF((zipFile file,
-                                            const char* filename,
-                                            const zip_fileinfo* zipfi,
-                                            const void* extrafield_local,
-                                            uInt size_extrafield_local,
-                                            const void* extrafield_global,
-                                            uInt size_extrafield_global,
-                                            const char* comment,
-                                            int method,
-                                            int level,
-                                            int raw,
-                                            int windowBits,
-                                            int memLevel,
-                                            int strategy,
-                                            const char* password,
-                                            uLong crcForCrypting,
-                                            uLong versionMadeBy,
-                                            uLong flagBase,
-                                            int zip64
-                                            ));
-/*
-  Same than zipOpenNewFileInZip4, except
-    versionMadeBy : value for Version made by field
-    flag : value for flag field (compression level info will be added)
- */
-
-
-extern int ZEXPORT zipWriteInFileInZip OF((zipFile file,
-                       const void* buf,
-                       unsigned len));
-/*
-  Write data in the zipfile
-*/
-
-extern int ZEXPORT zipCloseFileInZip OF((zipFile file));
-/*
-  Close the current file in the zipfile
-*/
-
-extern int ZEXPORT zipCloseFileInZipRaw OF((zipFile file,
-                                            uLong uncompressed_size,
-                                            uLong crc32));
-
-extern int ZEXPORT zipCloseFileInZipRaw64 OF((zipFile file,
-                                            ZPOS64_T uncompressed_size,
-                                            uLong crc32));
-
-/*
-  Close the current file in the zipfile, for file opened with
-    parameter raw=1 in zipOpenNewFileInZip2
-  uncompressed_size and crc32 are value for the uncompressed size
-*/
-
-extern int ZEXPORT zipClose OF((zipFile file,
-                const char* global_comment));
-/*
-  Close the zipfile
-*/
-
-
-extern int ZEXPORT zipRemoveExtraInfoBlock OF((char* pData, int* dataLen, short sHeader));
-/*
-  zipRemoveExtraInfoBlock -  Added by Mathias Svensson
-
-  Remove extra information block from a extra information data for the local file header or central directory header
-
-  It is needed to remove ZIP64 extra information blocks when before data is written if using RAW mode.
-
-  0x0001 is the signature header for the ZIP64 extra information blocks
-
-  usage.
-                        Remove ZIP64 Extra information from a central director extra field data
-              zipRemoveExtraInfoBlock(pCenDirExtraFieldData, &nCenDirExtraFieldDataLen, 0x0001);
-
-                        Remove ZIP64 Extra information from a Local File Header extra field data
-        zipRemoveExtraInfoBlock(pLocalHeaderExtraFieldData, &nLocalHeaderExtraFieldDataLen, 0x0001);
-*/
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* _zip64_H */
diff --git a/src/png/zlib/contrib/pascal/example.pas b/src/png/zlib/contrib/pascal/example.pas
deleted file mode 100644
index 5518b36a7..000000000
--- a/src/png/zlib/contrib/pascal/example.pas
+++ /dev/null
@@ -1,599 +0,0 @@
-(* example.c -- usage example of the zlib compression library
- * Copyright (C) 1995-2003 Jean-loup Gailly.
- * For conditions of distribution and use, see copyright notice in zlib.h
- *
- * Pascal translation
- * Copyright (C) 1998 by Jacques Nomssi Nzali.
- * For conditions of distribution and use, see copyright notice in readme.txt
- *
- * Adaptation to the zlibpas interface
- * Copyright (C) 2003 by Cosmin Truta.
- * For conditions of distribution and use, see copyright notice in readme.txt
- *)
-
-program example;
-
-{$DEFINE TEST_COMPRESS}
-{DO NOT $DEFINE TEST_GZIO}
-{$DEFINE TEST_DEFLATE}
-{$DEFINE TEST_INFLATE}
-{$DEFINE TEST_FLUSH}
-{$DEFINE TEST_SYNC}
-{$DEFINE TEST_DICT}
-
-uses SysUtils, zlibpas;
-
-const TESTFILE = 'foo.gz';
-
-(* "hello world" would be more standard, but the repeated "hello"
- * stresses the compression code better, sorry...
- *)
-const hello: PChar = 'hello, hello!';
-
-const dictionary: PChar = 'hello';
-
-var dictId: LongInt; (* Adler32 value of the dictionary *)
-
-procedure CHECK_ERR(err: Integer; msg: String);
-begin
-  if err <> Z_OK then
-  begin
-    WriteLn(msg, ' error: ', err);
-    Halt(1);
-  end;
-end;
-
-procedure EXIT_ERR(const msg: String);
-begin
-  WriteLn('Error: ', msg);
-  Halt(1);
-end;
-
-(* ===========================================================================
- * Test compress and uncompress
- *)
-{$IFDEF TEST_COMPRESS}
-procedure test_compress(compr: Pointer; comprLen: LongInt;
-                        uncompr: Pointer; uncomprLen: LongInt);
-var err: Integer;
-    len: LongInt;
-begin
-  len := StrLen(hello)+1;
-
-  err := compress(compr, comprLen, hello, len);
-  CHECK_ERR(err, 'compress');
-
-  StrCopy(PChar(uncompr), 'garbage');
-
-  err := uncompress(uncompr, uncomprLen, compr, comprLen);
-  CHECK_ERR(err, 'uncompress');
-
-  if StrComp(PChar(uncompr), hello) <> 0 then
-    EXIT_ERR('bad uncompress')
-  else
-    WriteLn('uncompress(): ', PChar(uncompr));
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test read/write of .gz files
- *)
-{$IFDEF TEST_GZIO}
-procedure test_gzio(const fname: PChar; (* compressed file name *)
-                    uncompr: Pointer;
-                    uncomprLen: LongInt);
-var err: Integer;
-    len: Integer;
-    zfile: gzFile;
-    pos: LongInt;
-begin
-  len := StrLen(hello)+1;
-
-  zfile := gzopen(fname, 'wb');
-  if zfile = NIL then
-  begin
-    WriteLn('gzopen error');
-    Halt(1);
-  end;
-  gzputc(zfile, 'h');
-  if gzputs(zfile, 'ello') <> 4 then
-  begin
-    WriteLn('gzputs err: ', gzerror(zfile, err));
-    Halt(1);
-  end;
-  {$IFDEF GZ_FORMAT_STRING}
-  if gzprintf(zfile, ', %s!', 'hello') <> 8 then
-  begin
-    WriteLn('gzprintf err: ', gzerror(zfile, err));
-    Halt(1);
-  end;
-  {$ELSE}
-  if gzputs(zfile, ', hello!') <> 8 then
-  begin
-    WriteLn('gzputs err: ', gzerror(zfile, err));
-    Halt(1);
-  end;
-  {$ENDIF}
-  gzseek(zfile, 1, SEEK_CUR); (* add one zero byte *)
-  gzclose(zfile);
-
-  zfile := gzopen(fname, 'rb');
-  if zfile = NIL then
-  begin
-    WriteLn('gzopen error');
-    Halt(1);
-  end;
-
-  StrCopy(PChar(uncompr), 'garbage');
-
-  if gzread(zfile, uncompr, uncomprLen) <> len then
-  begin
-    WriteLn('gzread err: ', gzerror(zfile, err));
-    Halt(1);
-  end;
-  if StrComp(PChar(uncompr), hello) <> 0 then
-  begin
-    WriteLn('bad gzread: ', PChar(uncompr));
-    Halt(1);
-  end
-  else
-    WriteLn('gzread(): ', PChar(uncompr));
-
-  pos := gzseek(zfile, -8, SEEK_CUR);
-  if (pos <> 6) or (gztell(zfile) <> pos) then
-  begin
-    WriteLn('gzseek error, pos=', pos, ', gztell=', gztell(zfile));
-    Halt(1);
-  end;
-
-  if gzgetc(zfile) <> ' ' then
-  begin
-    WriteLn('gzgetc error');
-    Halt(1);
-  end;
-
-  if gzungetc(' ', zfile) <> ' ' then
-  begin
-    WriteLn('gzungetc error');
-    Halt(1);
-  end;
-
-  gzgets(zfile, PChar(uncompr), uncomprLen);
-  uncomprLen := StrLen(PChar(uncompr));
-  if uncomprLen <> 7 then (* " hello!" *)
-  begin
-    WriteLn('gzgets err after gzseek: ', gzerror(zfile, err));
-    Halt(1);
-  end;
-  if StrComp(PChar(uncompr), hello + 6) <> 0 then
-  begin
-    WriteLn('bad gzgets after gzseek');
-    Halt(1);
-  end
-  else
-    WriteLn('gzgets() after gzseek: ', PChar(uncompr));
-
-  gzclose(zfile);
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test deflate with small buffers
- *)
-{$IFDEF TEST_DEFLATE}
-procedure test_deflate(compr: Pointer; comprLen: LongInt);
-var c_stream: z_stream; (* compression stream *)
-    err: Integer;
-    len: LongInt;
-begin
-  len := StrLen(hello)+1;
-
-  c_stream.zalloc := NIL;
-  c_stream.zfree := NIL;
-  c_stream.opaque := NIL;
-
-  err := deflateInit(c_stream, Z_DEFAULT_COMPRESSION);
-  CHECK_ERR(err, 'deflateInit');
-
-  c_stream.next_in := hello;
-  c_stream.next_out := compr;
-
-  while (c_stream.total_in <> len) and
-        (c_stream.total_out < comprLen) do
-  begin
-    c_stream.avail_out := 1; { force small buffers }
-    c_stream.avail_in := 1;
-    err := deflate(c_stream, Z_NO_FLUSH);
-    CHECK_ERR(err, 'deflate');
-  end;
-
-  (* Finish the stream, still forcing small buffers: *)
-  while TRUE do
-  begin
-    c_stream.avail_out := 1;
-    err := deflate(c_stream, Z_FINISH);
-    if err = Z_STREAM_END then
-      break;
-    CHECK_ERR(err, 'deflate');
-  end;
-
-  err := deflateEnd(c_stream);
-  CHECK_ERR(err, 'deflateEnd');
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test inflate with small buffers
- *)
-{$IFDEF TEST_INFLATE}
-procedure test_inflate(compr: Pointer; comprLen : LongInt;
-                       uncompr: Pointer; uncomprLen : LongInt);
-var err: Integer;
-    d_stream: z_stream; (* decompression stream *)
-begin
-  StrCopy(PChar(uncompr), 'garbage');
-
-  d_stream.zalloc := NIL;
-  d_stream.zfree := NIL;
-  d_stream.opaque := NIL;
-
-  d_stream.next_in := compr;
-  d_stream.avail_in := 0;
-  d_stream.next_out := uncompr;
-
-  err := inflateInit(d_stream);
-  CHECK_ERR(err, 'inflateInit');
-
-  while (d_stream.total_out < uncomprLen) and
-        (d_stream.total_in < comprLen) do
-  begin
-    d_stream.avail_out := 1; (* force small buffers *)
-    d_stream.avail_in := 1;
-    err := inflate(d_stream, Z_NO_FLUSH);
-    if err = Z_STREAM_END then
-      break;
-    CHECK_ERR(err, 'inflate');
-  end;
-
-  err := inflateEnd(d_stream);
-  CHECK_ERR(err, 'inflateEnd');
-
-  if StrComp(PChar(uncompr), hello) <> 0 then
-    EXIT_ERR('bad inflate')
-  else
-    WriteLn('inflate(): ', PChar(uncompr));
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test deflate with large buffers and dynamic change of compression level
- *)
-{$IFDEF TEST_DEFLATE}
-procedure test_large_deflate(compr: Pointer; comprLen: LongInt;
-                             uncompr: Pointer; uncomprLen: LongInt);
-var c_stream: z_stream; (* compression stream *)
-    err: Integer;
-begin
-  c_stream.zalloc := NIL;
-  c_stream.zfree := NIL;
-  c_stream.opaque := NIL;
-
-  err := deflateInit(c_stream, Z_BEST_SPEED);
-  CHECK_ERR(err, 'deflateInit');
-
-  c_stream.next_out := compr;
-  c_stream.avail_out := Integer(comprLen);
-
-  (* At this point, uncompr is still mostly zeroes, so it should compress
-   * very well:
-   *)
-  c_stream.next_in := uncompr;
-  c_stream.avail_in := Integer(uncomprLen);
-  err := deflate(c_stream, Z_NO_FLUSH);
-  CHECK_ERR(err, 'deflate');
-  if c_stream.avail_in <> 0 then
-    EXIT_ERR('deflate not greedy');
-
-  (* Feed in already compressed data and switch to no compression: *)
-  deflateParams(c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
-  c_stream.next_in := compr;
-  c_stream.avail_in := Integer(comprLen div 2);
-  err := deflate(c_stream, Z_NO_FLUSH);
-  CHECK_ERR(err, 'deflate');
-
-  (* Switch back to compressing mode: *)
-  deflateParams(c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
-  c_stream.next_in := uncompr;
-  c_stream.avail_in := Integer(uncomprLen);
-  err := deflate(c_stream, Z_NO_FLUSH);
-  CHECK_ERR(err, 'deflate');
-
-  err := deflate(c_stream, Z_FINISH);
-  if err <> Z_STREAM_END then
-    EXIT_ERR('deflate should report Z_STREAM_END');
-
-  err := deflateEnd(c_stream);
-  CHECK_ERR(err, 'deflateEnd');
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test inflate with large buffers
- *)
-{$IFDEF TEST_INFLATE}
-procedure test_large_inflate(compr: Pointer; comprLen: LongInt;
-                             uncompr: Pointer; uncomprLen: LongInt);
-var err: Integer;
-    d_stream: z_stream; (* decompression stream *)
-begin
-  StrCopy(PChar(uncompr), 'garbage');
-
-  d_stream.zalloc := NIL;
-  d_stream.zfree := NIL;
-  d_stream.opaque := NIL;
-
-  d_stream.next_in := compr;
-  d_stream.avail_in := Integer(comprLen);
-
-  err := inflateInit(d_stream);
-  CHECK_ERR(err, 'inflateInit');
-
-  while TRUE do
-  begin
-    d_stream.next_out := uncompr;            (* discard the output *)
-    d_stream.avail_out := Integer(uncomprLen);
-    err := inflate(d_stream, Z_NO_FLUSH);
-    if err = Z_STREAM_END then
-      break;
-    CHECK_ERR(err, 'large inflate');
-  end;
-
-  err := inflateEnd(d_stream);
-  CHECK_ERR(err, 'inflateEnd');
-
-  if d_stream.total_out <> 2 * uncomprLen + comprLen div 2 then
-  begin
-    WriteLn('bad large inflate: ', d_stream.total_out);
-    Halt(1);
-  end
-  else
-    WriteLn('large_inflate(): OK');
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test deflate with full flush
- *)
-{$IFDEF TEST_FLUSH}
-procedure test_flush(compr: Pointer; var comprLen : LongInt);
-var c_stream: z_stream; (* compression stream *)
-    err: Integer;
-    len: Integer;
-begin
-  len := StrLen(hello)+1;
-
-  c_stream.zalloc := NIL;
-  c_stream.zfree := NIL;
-  c_stream.opaque := NIL;
-
-  err := deflateInit(c_stream, Z_DEFAULT_COMPRESSION);
-  CHECK_ERR(err, 'deflateInit');
-
-  c_stream.next_in := hello;
-  c_stream.next_out := compr;
-  c_stream.avail_in := 3;
-  c_stream.avail_out := Integer(comprLen);
-  err := deflate(c_stream, Z_FULL_FLUSH);
-  CHECK_ERR(err, 'deflate');
-
-  Inc(PByteArray(compr)^[3]); (* force an error in first compressed block *)
-  c_stream.avail_in := len - 3;
-
-  err := deflate(c_stream, Z_FINISH);
-  if err <> Z_STREAM_END then
-    CHECK_ERR(err, 'deflate');
-
-  err := deflateEnd(c_stream);
-  CHECK_ERR(err, 'deflateEnd');
-
-  comprLen := c_stream.total_out;
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test inflateSync()
- *)
-{$IFDEF TEST_SYNC}
-procedure test_sync(compr: Pointer; comprLen: LongInt;
-                    uncompr: Pointer; uncomprLen : LongInt);
-var err: Integer;
-    d_stream: z_stream; (* decompression stream *)
-begin
-  StrCopy(PChar(uncompr), 'garbage');
-
-  d_stream.zalloc := NIL;
-  d_stream.zfree := NIL;
-  d_stream.opaque := NIL;
-
-  d_stream.next_in := compr;
-  d_stream.avail_in := 2; (* just read the zlib header *)
-
-  err := inflateInit(d_stream);
-  CHECK_ERR(err, 'inflateInit');
-
-  d_stream.next_out := uncompr;
-  d_stream.avail_out := Integer(uncomprLen);
-
-  inflate(d_stream, Z_NO_FLUSH);
-  CHECK_ERR(err, 'inflate');
-
-  d_stream.avail_in := Integer(comprLen-2);   (* read all compressed data *)
-  err := inflateSync(d_stream);               (* but skip the damaged part *)
-  CHECK_ERR(err, 'inflateSync');
-
-  err := inflate(d_stream, Z_FINISH);
-  if err <> Z_DATA_ERROR then
-    EXIT_ERR('inflate should report DATA_ERROR');
-    (* Because of incorrect adler32 *)
-
-  err := inflateEnd(d_stream);
-  CHECK_ERR(err, 'inflateEnd');
-
-  WriteLn('after inflateSync(): hel', PChar(uncompr));
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test deflate with preset dictionary
- *)
-{$IFDEF TEST_DICT}
-procedure test_dict_deflate(compr: Pointer; comprLen: LongInt);
-var c_stream: z_stream; (* compression stream *)
-    err: Integer;
-begin
-  c_stream.zalloc := NIL;
-  c_stream.zfree := NIL;
-  c_stream.opaque := NIL;
-
-  err := deflateInit(c_stream, Z_BEST_COMPRESSION);
-  CHECK_ERR(err, 'deflateInit');
-
-  err := deflateSetDictionary(c_stream, dictionary, StrLen(dictionary));
-  CHECK_ERR(err, 'deflateSetDictionary');
-
-  dictId := c_stream.adler;
-  c_stream.next_out := compr;
-  c_stream.avail_out := Integer(comprLen);
-
-  c_stream.next_in := hello;
-  c_stream.avail_in := StrLen(hello)+1;
-
-  err := deflate(c_stream, Z_FINISH);
-  if err <> Z_STREAM_END then
-    EXIT_ERR('deflate should report Z_STREAM_END');
-
-  err := deflateEnd(c_stream);
-  CHECK_ERR(err, 'deflateEnd');
-end;
-{$ENDIF}
-
-(* ===========================================================================
- * Test inflate with a preset dictionary
- *)
-{$IFDEF TEST_DICT}
-procedure test_dict_inflate(compr: Pointer; comprLen: LongInt;
-                            uncompr: Pointer; uncomprLen: LongInt);
-var err: Integer;
-    d_stream: z_stream; (* decompression stream *)
-begin
-  StrCopy(PChar(uncompr), 'garbage');
-
-  d_stream.zalloc := NIL;
-  d_stream.zfree := NIL;
-  d_stream.opaque := NIL;
-
-  d_stream.next_in := compr;
-  d_stream.avail_in := Integer(comprLen);
-
-  err := inflateInit(d_stream);
-  CHECK_ERR(err, 'inflateInit');
-
-  d_stream.next_out := uncompr;
-  d_stream.avail_out := Integer(uncomprLen);
-
-  while TRUE do
-  begin
-    err := inflate(d_stream, Z_NO_FLUSH);
-    if err = Z_STREAM_END then
-      break;
-    if err = Z_NEED_DICT then
-    begin
-      if d_stream.adler <> dictId then
-        EXIT_ERR('unexpected dictionary');
-      err := inflateSetDictionary(d_stream, dictionary, StrLen(dictionary));
-    end;
-    CHECK_ERR(err, 'inflate with dict');
-  end;
-
-  err := inflateEnd(d_stream);
-  CHECK_ERR(err, 'inflateEnd');
-
-  if StrComp(PChar(uncompr), hello) <> 0 then
-    EXIT_ERR('bad inflate with dict')
-  else
-    WriteLn('inflate with dictionary: ', PChar(uncompr));
-end;
-{$ENDIF}
-
-var compr, uncompr: Pointer;
-    comprLen, uncomprLen: LongInt;
-
-begin
-  if zlibVersion^ <> ZLIB_VERSION[1] then
-    EXIT_ERR('Incompatible zlib version');
-
-  WriteLn('zlib version: ', zlibVersion);
-  WriteLn('zlib compile flags: ', Format('0x%x', [zlibCompileFlags]));
-
-  comprLen := 10000 * SizeOf(Integer); (* don't overflow on MSDOS *)
-  uncomprLen := comprLen;
-  GetMem(compr, comprLen);
-  GetMem(uncompr, uncomprLen);
-  if (compr = NIL) or (uncompr = NIL) then
-    EXIT_ERR('Out of memory');
-  (* compr and uncompr are cleared to avoid reading uninitialized
-   * data and to ensure that uncompr compresses well.
-   *)
-  FillChar(compr^, comprLen, 0);
-  FillChar(uncompr^, uncomprLen, 0);
-
-  {$IFDEF TEST_COMPRESS}
-  WriteLn('** Testing compress');
-  test_compress(compr, comprLen, uncompr, uncomprLen);
-  {$ENDIF}
-
-  {$IFDEF TEST_GZIO}
-  WriteLn('** Testing gzio');
-  if ParamCount >= 1 then
-    test_gzio(ParamStr(1), uncompr, uncomprLen)
-  else
-    test_gzio(TESTFILE, uncompr, uncomprLen);
-  {$ENDIF}
-
-  {$IFDEF TEST_DEFLATE}
-  WriteLn('** Testing deflate with small buffers');
-  test_deflate(compr, comprLen);
-  {$ENDIF}
-  {$IFDEF TEST_INFLATE}
-  WriteLn('** Testing inflate with small buffers');
-  test_inflate(compr, comprLen, uncompr, uncomprLen);
-  {$ENDIF}
-
-  {$IFDEF TEST_DEFLATE}
-  WriteLn('** Testing deflate with large buffers');
-  test_large_deflate(compr, comprLen, uncompr, uncomprLen);
-  {$ENDIF}
-  {$IFDEF TEST_INFLATE}
-  WriteLn('** Testing inflate with large buffers');
-  test_large_inflate(compr, comprLen, uncompr, uncomprLen);
-  {$ENDIF}
-
-  {$IFDEF TEST_FLUSH}
-  WriteLn('** Testing deflate with full flush');
-  test_flush(compr, comprLen);
-  {$ENDIF}
-  {$IFDEF TEST_SYNC}
-  WriteLn('** Testing inflateSync');
-  test_sync(compr, comprLen, uncompr, uncomprLen);
-  {$ENDIF}
-  comprLen := uncomprLen;
-
-  {$IFDEF TEST_DICT}
-  WriteLn('** Testing deflate and inflate with preset dictionary');
-  test_dict_deflate(compr, comprLen);
-  test_dict_inflate(compr, comprLen, uncompr, uncomprLen);
-  {$ENDIF}
-
-  FreeMem(compr, comprLen);
-  FreeMem(uncompr, uncomprLen);
-end.
diff --git a/src/png/zlib/contrib/pascal/readme.txt b/src/png/zlib/contrib/pascal/readme.txt
deleted file mode 100644
index 60e87c8a3..000000000
--- a/src/png/zlib/contrib/pascal/readme.txt
+++ /dev/null
@@ -1,76 +0,0 @@
-
-This directory contains a Pascal (Delphi, Kylix) interface to the
-zlib data compression library.
-
-
-Directory listing
-=================
-
-zlibd32.mak     makefile for Borland C++
-example.pas     usage example of zlib
-zlibpas.pas     the Pascal interface to zlib
-readme.txt      this file
-
-
-Compatibility notes
-===================
-
-- Although the name "zlib" would have been more normal for the
-  zlibpas unit, this name is already taken by Borland's ZLib unit.
-  This is somehow unfortunate, because that unit is not a genuine
-  interface to the full-fledged zlib functionality, but a suite of
-  class wrappers around zlib streams.  Other essential features,
-  such as checksums, are missing.
-  It would have been more appropriate for that unit to have a name
-  like "ZStreams", or something similar.
-
-- The C and zlib-supplied types int, uInt, long, uLong, etc. are
-  translated directly into Pascal types of similar sizes (Integer,
-  LongInt, etc.), to avoid namespace pollution.  In particular,
-  there is no conversion of unsigned int into a Pascal unsigned
-  integer.  The Word type is non-portable and has the same size
-  (16 bits) both in a 16-bit and in a 32-bit environment, unlike
-  Integer.  Even if there is a 32-bit Cardinal type, there is no
-  real need for unsigned int in zlib under a 32-bit environment.
-
-- Except for the callbacks, the zlib function interfaces are
-  assuming the calling convention normally used in Pascal
-  (__pascal for DOS and Windows16, __fastcall for Windows32).
-  Since the cdecl keyword is used, the old Turbo Pascal does
-  not work with this interface.
-
-- The gz* function interfaces are not translated, to avoid
-  interfacing problems with the C runtime library.  Besides,
-    gzprintf(gzFile file, const char *format, ...)
-  cannot be translated into Pascal.
-
-
-Legal issues
-============
-
-The zlibpas interface is:
-  Copyright (C) 1995-2003 Jean-loup Gailly and Mark Adler.
-  Copyright (C) 1998 by Bob Dellaca.
-  Copyright (C) 2003 by Cosmin Truta.
-
-The example program is:
-  Copyright (C) 1995-2003 by Jean-loup Gailly.
-  Copyright (C) 1998,1999,2000 by Jacques Nomssi Nzali.
-  Copyright (C) 2003 by Cosmin Truta.
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the author be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-
diff --git a/src/png/zlib/contrib/pascal/zlibd32.mak b/src/png/zlib/contrib/pascal/zlibd32.mak
deleted file mode 100644
index 9bb00b7cc..000000000
--- a/src/png/zlib/contrib/pascal/zlibd32.mak
+++ /dev/null
@@ -1,99 +0,0 @@
-# Makefile for zlib
-# For use with Delphi and C++ Builder under Win32
-# Updated for zlib 1.2.x by Cosmin Truta
-
-# ------------ Borland C++ ------------
-
-# This project uses the Delphi (fastcall/register) calling convention:
-LOC = -DZEXPORT=__fastcall -DZEXPORTVA=__cdecl
-
-CC = bcc32
-LD = bcc32
-AR = tlib
-# do not use "-pr" in CFLAGS
-CFLAGS = -a -d -k- -O2 $(LOC)
-LDFLAGS =
-
-
-# variables
-ZLIB_LIB = zlib.lib
-
-OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj
-OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj
-OBJP1 = +adler32.obj+compress.obj+crc32.obj+deflate.obj+gzclose.obj+gzlib.obj+gzread.obj
-OBJP2 = +gzwrite.obj+infback.obj+inffast.obj+inflate.obj+inftrees.obj+trees.obj+uncompr.obj+zutil.obj
-
-
-# targets
-all: $(ZLIB_LIB) example.exe minigzip.exe
-
-.c.obj:
-	$(CC) -c $(CFLAGS) $*.c
-
-adler32.obj: adler32.c zlib.h zconf.h
-
-compress.obj: compress.c zlib.h zconf.h
-
-crc32.obj: crc32.c zlib.h zconf.h crc32.h
-
-deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
-
-gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h
-
-gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h
-
-gzread.obj: gzread.c zlib.h zconf.h gzguts.h
-
-gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h
-
-infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h inffixed.h
-
-inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h
-
-inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h inffixed.h
-
-inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
-
-trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h
-
-uncompr.obj: uncompr.c zlib.h zconf.h
-
-zutil.obj: zutil.c zutil.h zlib.h zconf.h
-
-example.obj: test/example.c zlib.h zconf.h
-
-minigzip.obj: test/minigzip.c zlib.h zconf.h
-
-
-# For the sake of the old Borland make,
-# the command line is cut to fit in the MS-DOS 128 byte limit:
-$(ZLIB_LIB): $(OBJ1) $(OBJ2)
-	-del $(ZLIB_LIB)
-	$(AR) $(ZLIB_LIB) $(OBJP1)
-	$(AR) $(ZLIB_LIB) $(OBJP2)
-
-
-# testing
-test: example.exe minigzip.exe
-	example
-	echo hello world | minigzip | minigzip -d
-
-example.exe: example.obj $(ZLIB_LIB)
-	$(LD) $(LDFLAGS) example.obj $(ZLIB_LIB)
-
-minigzip.exe: minigzip.obj $(ZLIB_LIB)
-	$(LD) $(LDFLAGS) minigzip.obj $(ZLIB_LIB)
-
-
-# cleanup
-clean:
-	-del *.obj
-	-del *.exe
-	-del *.lib
-	-del *.tds
-	-del zlib.bak
-	-del foo.gz
-
diff --git a/src/png/zlib/contrib/pascal/zlibpas.pas b/src/png/zlib/contrib/pascal/zlibpas.pas
deleted file mode 100644
index a0dff11b5..000000000
--- a/src/png/zlib/contrib/pascal/zlibpas.pas
+++ /dev/null
@@ -1,276 +0,0 @@
-(* zlibpas -- Pascal interface to the zlib data compression library
- *
- * Copyright (C) 2003 Cosmin Truta.
- * Derived from original sources by Bob Dellaca.
- * For conditions of distribution and use, see copyright notice in readme.txt
- *)
-
-unit zlibpas;
-
-interface
-
-const
-  ZLIB_VERSION = '1.2.11';
-  ZLIB_VERNUM  = $12a0;
-
-type
-  alloc_func = function(opaque: Pointer; items, size: Integer): Pointer;
-                 cdecl;
-  free_func  = procedure(opaque, address: Pointer);
-                 cdecl;
-
-  in_func    = function(opaque: Pointer; var buf: PByte): Integer;
-                 cdecl;
-  out_func   = function(opaque: Pointer; buf: PByte; size: Integer): Integer;
-                 cdecl;
-
-  z_streamp = ^z_stream;
-  z_stream = packed record
-    next_in: PChar;       (* next input byte *)
-    avail_in: Integer;    (* number of bytes available at next_in *)
-    total_in: LongInt;    (* total nb of input bytes read so far *)
-
-    next_out: PChar;      (* next output byte should be put there *)
-    avail_out: Integer;   (* remaining free space at next_out *)
-    total_out: LongInt;   (* total nb of bytes output so far *)
-
-    msg: PChar;           (* last error message, NULL if no error *)
-    state: Pointer;       (* not visible by applications *)
-
-    zalloc: alloc_func;   (* used to allocate the internal state *)
-    zfree: free_func;     (* used to free the internal state *)
-    opaque: Pointer;      (* private data object passed to zalloc and zfree *)
-
-    data_type: Integer;   (* best guess about the data type: ascii or binary *)
-    adler: LongInt;       (* adler32 value of the uncompressed data *)
-    reserved: LongInt;    (* reserved for future use *)
-  end;
-
-  gz_headerp = ^gz_header;
-  gz_header = packed record
-    text: Integer;        (* true if compressed data believed to be text *)
-    time: LongInt;        (* modification time *)
-    xflags: Integer;      (* extra flags (not used when writing a gzip file) *)
-    os: Integer;          (* operating system *)
-    extra: PChar;         (* pointer to extra field or Z_NULL if none *)
-    extra_len: Integer;   (* extra field length (valid if extra != Z_NULL) *)
-    extra_max: Integer;   (* space at extra (only when reading header) *)
-    name: PChar;          (* pointer to zero-terminated file name or Z_NULL *)
-    name_max: Integer;    (* space at name (only when reading header) *)
-    comment: PChar;       (* pointer to zero-terminated comment or Z_NULL *)
-    comm_max: Integer;    (* space at comment (only when reading header) *)
-    hcrc: Integer;        (* true if there was or will be a header crc *)
-    done: Integer;        (* true when done reading gzip header *)
-  end;
-
-(* constants *)
-const
-  Z_NO_FLUSH      = 0;
-  Z_PARTIAL_FLUSH = 1;
-  Z_SYNC_FLUSH    = 2;
-  Z_FULL_FLUSH    = 3;
-  Z_FINISH        = 4;
-  Z_BLOCK         = 5;
-  Z_TREES         = 6;
-
-  Z_OK            =  0;
-  Z_STREAM_END    =  1;
-  Z_NEED_DICT     =  2;
-  Z_ERRNO         = -1;
-  Z_STREAM_ERROR  = -2;
-  Z_DATA_ERROR    = -3;
-  Z_MEM_ERROR     = -4;
-  Z_BUF_ERROR     = -5;
-  Z_VERSION_ERROR = -6;
-
-  Z_NO_COMPRESSION       =  0;
-  Z_BEST_SPEED           =  1;
-  Z_BEST_COMPRESSION     =  9;
-  Z_DEFAULT_COMPRESSION  = -1;
-
-  Z_FILTERED            = 1;
-  Z_HUFFMAN_ONLY        = 2;
-  Z_RLE                 = 3;
-  Z_FIXED               = 4;
-  Z_DEFAULT_STRATEGY    = 0;
-
-  Z_BINARY   = 0;
-  Z_TEXT     = 1;
-  Z_ASCII    = 1;
-  Z_UNKNOWN  = 2;
-
-  Z_DEFLATED = 8;
-
-(* basic functions *)
-function zlibVersion: PChar;
-function deflateInit(var strm: z_stream; level: Integer): Integer;
-function deflate(var strm: z_stream; flush: Integer): Integer;
-function deflateEnd(var strm: z_stream): Integer;
-function inflateInit(var strm: z_stream): Integer;
-function inflate(var strm: z_stream; flush: Integer): Integer;
-function inflateEnd(var strm: z_stream): Integer;
-
-(* advanced functions *)
-function deflateInit2(var strm: z_stream; level, method, windowBits,
-                      memLevel, strategy: Integer): Integer;
-function deflateSetDictionary(var strm: z_stream; const dictionary: PChar;
-                              dictLength: Integer): Integer;
-function deflateCopy(var dest, source: z_stream): Integer;
-function deflateReset(var strm: z_stream): Integer;
-function deflateParams(var strm: z_stream; level, strategy: Integer): Integer;
-function deflateTune(var strm: z_stream; good_length, max_lazy, nice_length, max_chain: Integer): Integer;
-function deflateBound(var strm: z_stream; sourceLen: LongInt): LongInt;
-function deflatePending(var strm: z_stream; var pending: Integer; var bits: Integer): Integer;
-function deflatePrime(var strm: z_stream; bits, value: Integer): Integer;
-function deflateSetHeader(var strm: z_stream; head: gz_header): Integer;
-function inflateInit2(var strm: z_stream; windowBits: Integer): Integer;
-function inflateSetDictionary(var strm: z_stream; const dictionary: PChar;
-                              dictLength: Integer): Integer;
-function inflateSync(var strm: z_stream): Integer;
-function inflateCopy(var dest, source: z_stream): Integer;
-function inflateReset(var strm: z_stream): Integer;
-function inflateReset2(var strm: z_stream; windowBits: Integer): Integer;
-function inflatePrime(var strm: z_stream; bits, value: Integer): Integer;
-function inflateMark(var strm: z_stream): LongInt;
-function inflateGetHeader(var strm: z_stream; var head: gz_header): Integer;
-function inflateBackInit(var strm: z_stream;
-                         windowBits: Integer; window: PChar): Integer;
-function inflateBack(var strm: z_stream; in_fn: in_func; in_desc: Pointer;
-                     out_fn: out_func; out_desc: Pointer): Integer;
-function inflateBackEnd(var strm: z_stream): Integer;
-function zlibCompileFlags: LongInt;
-
-(* utility functions *)
-function compress(dest: PChar; var destLen: LongInt;
-                  const source: PChar; sourceLen: LongInt): Integer;
-function compress2(dest: PChar; var destLen: LongInt;
-                  const source: PChar; sourceLen: LongInt;
-                  level: Integer): Integer;
-function compressBound(sourceLen: LongInt): LongInt;
-function uncompress(dest: PChar; var destLen: LongInt;
-                    const source: PChar; sourceLen: LongInt): Integer;
-
-(* checksum functions *)
-function adler32(adler: LongInt; const buf: PChar; len: Integer): LongInt;
-function adler32_combine(adler1, adler2, len2: LongInt): LongInt;
-function crc32(crc: LongInt; const buf: PChar; len: Integer): LongInt;
-function crc32_combine(crc1, crc2, len2: LongInt): LongInt;
-
-(* various hacks, don't look :) *)
-function deflateInit_(var strm: z_stream; level: Integer;
-                      const version: PChar; stream_size: Integer): Integer;
-function inflateInit_(var strm: z_stream; const version: PChar;
-                      stream_size: Integer): Integer;
-function deflateInit2_(var strm: z_stream;
-                       level, method, windowBits, memLevel, strategy: Integer;
-                       const version: PChar; stream_size: Integer): Integer;
-function inflateInit2_(var strm: z_stream; windowBits: Integer;
-                       const version: PChar; stream_size: Integer): Integer;
-function inflateBackInit_(var strm: z_stream;
-                          windowBits: Integer; window: PChar;
-                          const version: PChar; stream_size: Integer): Integer;
-
-
-implementation
-
-{$L adler32.obj}
-{$L compress.obj}
-{$L crc32.obj}
-{$L deflate.obj}
-{$L infback.obj}
-{$L inffast.obj}
-{$L inflate.obj}
-{$L inftrees.obj}
-{$L trees.obj}
-{$L uncompr.obj}
-{$L zutil.obj}
-
-function adler32; external;
-function adler32_combine; external;
-function compress; external;
-function compress2; external;
-function compressBound; external;
-function crc32; external;
-function crc32_combine; external;
-function deflate; external;
-function deflateBound; external;
-function deflateCopy; external;
-function deflateEnd; external;
-function deflateInit_; external;
-function deflateInit2_; external;
-function deflateParams; external;
-function deflatePending; external;
-function deflatePrime; external;
-function deflateReset; external;
-function deflateSetDictionary; external;
-function deflateSetHeader; external;
-function deflateTune; external;
-function inflate; external;
-function inflateBack; external;
-function inflateBackEnd; external;
-function inflateBackInit_; external;
-function inflateCopy; external;
-function inflateEnd; external;
-function inflateGetHeader; external;
-function inflateInit_; external;
-function inflateInit2_; external;
-function inflateMark; external;
-function inflatePrime; external;
-function inflateReset; external;
-function inflateReset2; external;
-function inflateSetDictionary; external;
-function inflateSync; external;
-function uncompress; external;
-function zlibCompileFlags; external;
-function zlibVersion; external;
-
-function deflateInit(var strm: z_stream; level: Integer): Integer;
-begin
-  Result := deflateInit_(strm, level, ZLIB_VERSION, sizeof(z_stream));
-end;
-
-function deflateInit2(var strm: z_stream; level, method, windowBits, memLevel,
-                      strategy: Integer): Integer;
-begin
-  Result := deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
-                          ZLIB_VERSION, sizeof(z_stream));
-end;
-
-function inflateInit(var strm: z_stream): Integer;
-begin
-  Result := inflateInit_(strm, ZLIB_VERSION, sizeof(z_stream));
-end;
-
-function inflateInit2(var strm: z_stream; windowBits: Integer): Integer;
-begin
-  Result := inflateInit2_(strm, windowBits, ZLIB_VERSION, sizeof(z_stream));
-end;
-
-function inflateBackInit(var strm: z_stream;
-                         windowBits: Integer; window: PChar): Integer;
-begin
-  Result := inflateBackInit_(strm, windowBits, window,
-                             ZLIB_VERSION, sizeof(z_stream));
-end;
-
-function _malloc(Size: Integer): Pointer; cdecl;
-begin
-  GetMem(Result, Size);
-end;
-
-procedure _free(Block: Pointer); cdecl;
-begin
-  FreeMem(Block);
-end;
-
-procedure _memset(P: Pointer; B: Byte; count: Integer); cdecl;
-begin
-  FillChar(P^, count, B);
-end;
-
-procedure _memcpy(dest, source: Pointer; count: Integer); cdecl;
-begin
-  Move(source^, dest^, count);
-end;
-
-end.
diff --git a/src/png/zlib/contrib/puff/Makefile b/src/png/zlib/contrib/puff/Makefile
deleted file mode 100644
index 0e2594c80..000000000
--- a/src/png/zlib/contrib/puff/Makefile
+++ /dev/null
@@ -1,42 +0,0 @@
-CFLAGS=-O
-
-puff: puff.o pufftest.o
-
-puff.o: puff.h
-
-pufftest.o: puff.h
-
-test: puff
-	puff zeros.raw
-
-puft: puff.c puff.h pufftest.o
-	cc -fprofile-arcs -ftest-coverage -o puft puff.c pufftest.o
-
-# puff full coverage test (should say 100%)
-cov: puft
-	@rm -f *.gcov *.gcda
-	@puft -w zeros.raw 2>&1 | cat > /dev/null
-	@echo '04' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
-	@echo '00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
-	@echo '00 00 00 00 00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 254
-	@echo '00 01 00 fe ff' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
-	@echo '01 01 00 fe ff 0a' | xxd -r -p | puft -f 2>&1 | cat > /dev/null
-	@echo '02 7e ff ff' | xxd -r -p | puft 2> /dev/null || test $$? -eq 246
-	@echo '02' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
-	@echo '04 80 49 92 24 49 92 24 0f b4 ff ff c3 04' | xxd -r -p | puft 2> /dev/null || test $$? -eq 2
-	@echo '04 80 49 92 24 49 92 24 71 ff ff 93 11 00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 249
-	@echo '04 c0 81 08 00 00 00 00 20 7f eb 0b 00 00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 246
-	@echo '0b 00 00' | xxd -r -p | puft -f 2>&1 | cat > /dev/null
-	@echo '1a 07' | xxd -r -p | puft 2> /dev/null || test $$? -eq 246
-	@echo '0c c0 81 00 00 00 00 00 90 ff 6b 04' | xxd -r -p | puft 2> /dev/null || test $$? -eq 245
-	@puft -f zeros.raw 2>&1 | cat > /dev/null
-	@echo 'fc 00 00' | xxd -r -p | puft 2> /dev/null || test $$? -eq 253
-	@echo '04 00 fe ff' | xxd -r -p | puft 2> /dev/null || test $$? -eq 252
-	@echo '04 00 24 49' | xxd -r -p | puft 2> /dev/null || test $$? -eq 251
-	@echo '04 80 49 92 24 49 92 24 0f b4 ff ff c3 84' | xxd -r -p | puft 2> /dev/null || test $$? -eq 248
-	@echo '04 00 24 e9 ff ff' | xxd -r -p | puft 2> /dev/null || test $$? -eq 250
-	@echo '04 00 24 e9 ff 6d' | xxd -r -p | puft 2> /dev/null || test $$? -eq 247
-	@gcov -n puff.c
-
-clean:
-	rm -f puff puft *.o *.gc*
diff --git a/src/png/zlib/contrib/puff/README b/src/png/zlib/contrib/puff/README
deleted file mode 100644
index bbc4cb595..000000000
--- a/src/png/zlib/contrib/puff/README
+++ /dev/null
@@ -1,63 +0,0 @@
-Puff -- A Simple Inflate
-3 Mar 2003
-Mark Adler
-madler@alumni.caltech.edu
-
-What this is --
-
-puff.c provides the routine puff() to decompress the deflate data format.  It
-does so more slowly than zlib, but the code is about one-fifth the size of the
-inflate code in zlib, and written to be very easy to read.
-
-Why I wrote this --
-
-puff.c was written to document the deflate format unambiguously, by virtue of
-being working C code.  It is meant to supplement RFC 1951, which formally
-describes the deflate format.  I have received many questions on details of the
-deflate format, and I hope that reading this code will answer those questions.
-puff.c is heavily commented with details of the deflate format, especially
-those little nooks and cranies of the format that might not be obvious from a
-specification.
-
-puff.c may also be useful in applications where code size or memory usage is a
-very limited resource, and speed is not as important.
-
-How to use it --
-
-Well, most likely you should just be reading puff.c and using zlib for actual
-applications, but if you must ...
-
-Include puff.h in your code, which provides this prototype:
-
-int puff(unsigned char *dest,           /* pointer to destination pointer */
-         unsigned long *destlen,        /* amount of output space */
-         unsigned char *source,         /* pointer to source data pointer */
-         unsigned long *sourcelen);     /* amount of input available */
-
-Then you can call puff() to decompress a deflate stream that is in memory in
-its entirety at source, to a sufficiently sized block of memory for the
-decompressed data at dest.  puff() is the only external symbol in puff.c  The
-only C library functions that puff.c needs are setjmp() and longjmp(), which
-are used to simplify error checking in the code to improve readabilty.  puff.c
-does no memory allocation, and uses less than 2K bytes off of the stack.
-
-If destlen is not enough space for the uncompressed data, then inflate will
-return an error without writing more than destlen bytes.  Note that this means
-that in order to decompress the deflate data successfully, you need to know
-the size of the uncompressed data ahead of time.
-
-If needed, puff() can determine the size of the uncompressed data with no
-output space.  This is done by passing dest equal to (unsigned char *)0.  Then
-the initial value of *destlen is ignored and *destlen is set to the length of
-the uncompressed data.  So if the size of the uncompressed data is not known,
-then two passes of puff() can be used--first to determine the size, and second
-to do the actual inflation after allocating the appropriate memory.  Not
-pretty, but it works.  (This is one of the reasons you should be using zlib.)
-
-The deflate format is self-terminating.  If the deflate stream does not end
-in *sourcelen bytes, puff() will return an error without reading at or past
-endsource.
-
-On return, *sourcelen is updated to the amount of input data consumed, and
-*destlen is updated to the size of the uncompressed data.  See the comments
-in puff.c for the possible return codes for puff().
diff --git a/src/png/zlib/contrib/puff/puff.c b/src/png/zlib/contrib/puff/puff.c
deleted file mode 100644
index c6c90d714..000000000
--- a/src/png/zlib/contrib/puff/puff.c
+++ /dev/null
@@ -1,840 +0,0 @@
-/*
- * puff.c
- * Copyright (C) 2002-2013 Mark Adler
- * For conditions of distribution and use, see copyright notice in puff.h
- * version 2.3, 21 Jan 2013
- *
- * puff.c is a simple inflate written to be an unambiguous way to specify the
- * deflate format.  It is not written for speed but rather simplicity.  As a
- * side benefit, this code might actually be useful when small code is more
- * important than speed, such as bootstrap applications.  For typical deflate
- * data, zlib's inflate() is about four times as fast as puff().  zlib's
- * inflate compiles to around 20K on my machine, whereas puff.c compiles to
- * around 4K on my machine (a PowerPC using GNU cc).  If the faster decode()
- * function here is used, then puff() is only twice as slow as zlib's
- * inflate().
- *
- * All dynamically allocated memory comes from the stack.  The stack required
- * is less than 2K bytes.  This code is compatible with 16-bit int's and
- * assumes that long's are at least 32 bits.  puff.c uses the short data type,
- * assumed to be 16 bits, for arrays in order to conserve memory.  The code
- * works whether integers are stored big endian or little endian.
- *
- * In the comments below are "Format notes" that describe the inflate process
- * and document some of the less obvious aspects of the format.  This source
- * code is meant to supplement RFC 1951, which formally describes the deflate
- * format:
- *
- *    http://www.zlib.org/rfc-deflate.html
- */
-
-/*
- * Change history:
- *
- * 1.0  10 Feb 2002     - First version
- * 1.1  17 Feb 2002     - Clarifications of some comments and notes
- *                      - Update puff() dest and source pointers on negative
- *                        errors to facilitate debugging deflators
- *                      - Remove longest from struct huffman -- not needed
- *                      - Simplify offs[] index in construct()
- *                      - Add input size and checking, using longjmp() to
- *                        maintain easy readability
- *                      - Use short data type for large arrays
- *                      - Use pointers instead of long to specify source and
- *                        destination sizes to avoid arbitrary 4 GB limits
- * 1.2  17 Mar 2002     - Add faster version of decode(), doubles speed (!),
- *                        but leave simple version for readabilty
- *                      - Make sure invalid distances detected if pointers
- *                        are 16 bits
- *                      - Fix fixed codes table error
- *                      - Provide a scanning mode for determining size of
- *                        uncompressed data
- * 1.3  20 Mar 2002     - Go back to lengths for puff() parameters [Gailly]
- *                      - Add a puff.h file for the interface
- *                      - Add braces in puff() for else do [Gailly]
- *                      - Use indexes instead of pointers for readability
- * 1.4  31 Mar 2002     - Simplify construct() code set check
- *                      - Fix some comments
- *                      - Add FIXLCODES #define
- * 1.5   6 Apr 2002     - Minor comment fixes
- * 1.6   7 Aug 2002     - Minor format changes
- * 1.7   3 Mar 2003     - Added test code for distribution
- *                      - Added zlib-like license
- * 1.8   9 Jan 2004     - Added some comments on no distance codes case
- * 1.9  21 Feb 2008     - Fix bug on 16-bit integer architectures [Pohland]
- *                      - Catch missing end-of-block symbol error
- * 2.0  25 Jul 2008     - Add #define to permit distance too far back
- *                      - Add option in TEST code for puff to write the data
- *                      - Add option in TEST code to skip input bytes
- *                      - Allow TEST code to read from piped stdin
- * 2.1   4 Apr 2010     - Avoid variable initialization for happier compilers
- *                      - Avoid unsigned comparisons for even happier compilers
- * 2.2  25 Apr 2010     - Fix bug in variable initializations [Oberhumer]
- *                      - Add const where appropriate [Oberhumer]
- *                      - Split if's and ?'s for coverage testing
- *                      - Break out test code to separate file
- *                      - Move NIL to puff.h
- *                      - Allow incomplete code only if single code length is 1
- *                      - Add full code coverage test to Makefile
- * 2.3  21 Jan 2013     - Check for invalid code length codes in dynamic blocks
- */
-
-#include <setjmp.h>             /* for setjmp(), longjmp(), and jmp_buf */
-#include "puff.h"               /* prototype for puff() */
-
-#define local static            /* for local function definitions */
-
-/*
- * Maximums for allocations and loops.  It is not useful to change these --
- * they are fixed by the deflate format.
- */
-#define MAXBITS 15              /* maximum bits in a code */
-#define MAXLCODES 286           /* maximum number of literal/length codes */
-#define MAXDCODES 30            /* maximum number of distance codes */
-#define MAXCODES (MAXLCODES+MAXDCODES)  /* maximum codes lengths to read */
-#define FIXLCODES 288           /* number of fixed literal/length codes */
-
-/* input and output state */
-struct state {
-    /* output state */
-    unsigned char *out;         /* output buffer */
-    unsigned long outlen;       /* available space at out */
-    unsigned long outcnt;       /* bytes written to out so far */
-
-    /* input state */
-    const unsigned char *in;    /* input buffer */
-    unsigned long inlen;        /* available input at in */
-    unsigned long incnt;        /* bytes read so far */
-    int bitbuf;                 /* bit buffer */
-    int bitcnt;                 /* number of bits in bit buffer */
-
-    /* input limit error return state for bits() and decode() */
-    jmp_buf env;
-};
-
-/*
- * Return need bits from the input stream.  This always leaves less than
- * eight bits in the buffer.  bits() works properly for need == 0.
- *
- * Format notes:
- *
- * - Bits are stored in bytes from the least significant bit to the most
- *   significant bit.  Therefore bits are dropped from the bottom of the bit
- *   buffer, using shift right, and new bytes are appended to the top of the
- *   bit buffer, using shift left.
- */
-local int bits(struct state *s, int need)
-{
-    long val;           /* bit accumulator (can use up to 20 bits) */
-
-    /* load at least need bits into val */
-    val = s->bitbuf;
-    while (s->bitcnt < need) {
-        if (s->incnt == s->inlen)
-            longjmp(s->env, 1);         /* out of input */
-        val |= (long)(s->in[s->incnt++]) << s->bitcnt;  /* load eight bits */
-        s->bitcnt += 8;
-    }
-
-    /* drop need bits and update buffer, always zero to seven bits left */
-    s->bitbuf = (int)(val >> need);
-    s->bitcnt -= need;
-
-    /* return need bits, zeroing the bits above that */
-    return (int)(val & ((1L << need) - 1));
-}
-
-/*
- * Process a stored block.
- *
- * Format notes:
- *
- * - After the two-bit stored block type (00), the stored block length and
- *   stored bytes are byte-aligned for fast copying.  Therefore any leftover
- *   bits in the byte that has the last bit of the type, as many as seven, are
- *   discarded.  The value of the discarded bits are not defined and should not
- *   be checked against any expectation.
- *
- * - The second inverted copy of the stored block length does not have to be
- *   checked, but it's probably a good idea to do so anyway.
- *
- * - A stored block can have zero length.  This is sometimes used to byte-align
- *   subsets of the compressed data for random access or partial recovery.
- */
-local int stored(struct state *s)
-{
-    unsigned len;       /* length of stored block */
-
-    /* discard leftover bits from current byte (assumes s->bitcnt < 8) */
-    s->bitbuf = 0;
-    s->bitcnt = 0;
-
-    /* get length and check against its one's complement */
-    if (s->incnt + 4 > s->inlen)
-        return 2;                               /* not enough input */
-    len = s->in[s->incnt++];
-    len |= s->in[s->incnt++] << 8;
-    if (s->in[s->incnt++] != (~len & 0xff) ||
-        s->in[s->incnt++] != ((~len >> 8) & 0xff))
-        return -2;                              /* didn't match complement! */
-
-    /* copy len bytes from in to out */
-    if (s->incnt + len > s->inlen)
-        return 2;                               /* not enough input */
-    if (s->out != NIL) {
-        if (s->outcnt + len > s->outlen)
-            return 1;                           /* not enough output space */
-        while (len--)
-            s->out[s->outcnt++] = s->in[s->incnt++];
-    }
-    else {                                      /* just scanning */
-        s->outcnt += len;
-        s->incnt += len;
-    }
-
-    /* done with a valid stored block */
-    return 0;
-}
-
-/*
- * Huffman code decoding tables.  count[1..MAXBITS] is the number of symbols of
- * each length, which for a canonical code are stepped through in order.
- * symbol[] are the symbol values in canonical order, where the number of
- * entries is the sum of the counts in count[].  The decoding process can be
- * seen in the function decode() below.
- */
-struct huffman {
-    short *count;       /* number of symbols of each length */
-    short *symbol;      /* canonically ordered symbols */
-};
-
-/*
- * Decode a code from the stream s using huffman table h.  Return the symbol or
- * a negative value if there is an error.  If all of the lengths are zero, i.e.
- * an empty code, or if the code is incomplete and an invalid code is received,
- * then -10 is returned after reading MAXBITS bits.
- *
- * Format notes:
- *
- * - The codes as stored in the compressed data are bit-reversed relative to
- *   a simple integer ordering of codes of the same lengths.  Hence below the
- *   bits are pulled from the compressed data one at a time and used to
- *   build the code value reversed from what is in the stream in order to
- *   permit simple integer comparisons for decoding.  A table-based decoding
- *   scheme (as used in zlib) does not need to do this reversal.
- *
- * - The first code for the shortest length is all zeros.  Subsequent codes of
- *   the same length are simply integer increments of the previous code.  When
- *   moving up a length, a zero bit is appended to the code.  For a complete
- *   code, the last code of the longest length will be all ones.
- *
- * - Incomplete codes are handled by this decoder, since they are permitted
- *   in the deflate format.  See the format notes for fixed() and dynamic().
- */
-#ifdef SLOW
-local int decode(struct state *s, const struct huffman *h)
-{
-    int len;            /* current number of bits in code */
-    int code;           /* len bits being decoded */
-    int first;          /* first code of length len */
-    int count;          /* number of codes of length len */
-    int index;          /* index of first code of length len in symbol table */
-
-    code = first = index = 0;
-    for (len = 1; len <= MAXBITS; len++) {
-        code |= bits(s, 1);             /* get next bit */
-        count = h->count[len];
-        if (code - count < first)       /* if length len, return symbol */
-            return h->symbol[index + (code - first)];
-        index += count;                 /* else update for next length */
-        first += count;
-        first <<= 1;
-        code <<= 1;
-    }
-    return -10;                         /* ran out of codes */
-}
-
-/*
- * A faster version of decode() for real applications of this code.   It's not
- * as readable, but it makes puff() twice as fast.  And it only makes the code
- * a few percent larger.
- */
-#else /* !SLOW */
-local int decode(struct state *s, const struct huffman *h)
-{
-    int len;            /* current number of bits in code */
-    int code;           /* len bits being decoded */
-    int first;          /* first code of length len */
-    int count;          /* number of codes of length len */
-    int index;          /* index of first code of length len in symbol table */
-    int bitbuf;         /* bits from stream */
-    int left;           /* bits left in next or left to process */
-    short *next;        /* next number of codes */
-
-    bitbuf = s->bitbuf;
-    left = s->bitcnt;
-    code = first = index = 0;
-    len = 1;
-    next = h->count + 1;
-    while (1) {
-        while (left--) {
-            code |= bitbuf & 1;
-            bitbuf >>= 1;
-            count = *next++;
-            if (code - count < first) { /* if length len, return symbol */
-                s->bitbuf = bitbuf;
-                s->bitcnt = (s->bitcnt - len) & 7;
-                return h->symbol[index + (code - first)];
-            }
-            index += count;             /* else update for next length */
-            first += count;
-            first <<= 1;
-            code <<= 1;
-            len++;
-        }
-        left = (MAXBITS+1) - len;
-        if (left == 0)
-            break;
-        if (s->incnt == s->inlen)
-            longjmp(s->env, 1);         /* out of input */
-        bitbuf = s->in[s->incnt++];
-        if (left > 8)
-            left = 8;
-    }
-    return -10;                         /* ran out of codes */
-}
-#endif /* SLOW */
-
-/*
- * Given the list of code lengths length[0..n-1] representing a canonical
- * Huffman code for n symbols, construct the tables required to decode those
- * codes.  Those tables are the number of codes of each length, and the symbols
- * sorted by length, retaining their original order within each length.  The
- * return value is zero for a complete code set, negative for an over-
- * subscribed code set, and positive for an incomplete code set.  The tables
- * can be used if the return value is zero or positive, but they cannot be used
- * if the return value is negative.  If the return value is zero, it is not
- * possible for decode() using that table to return an error--any stream of
- * enough bits will resolve to a symbol.  If the return value is positive, then
- * it is possible for decode() using that table to return an error for received
- * codes past the end of the incomplete lengths.
- *
- * Not used by decode(), but used for error checking, h->count[0] is the number
- * of the n symbols not in the code.  So n - h->count[0] is the number of
- * codes.  This is useful for checking for incomplete codes that have more than
- * one symbol, which is an error in a dynamic block.
- *
- * Assumption: for all i in 0..n-1, 0 <= length[i] <= MAXBITS
- * This is assured by the construction of the length arrays in dynamic() and
- * fixed() and is not verified by construct().
- *
- * Format notes:
- *
- * - Permitted and expected examples of incomplete codes are one of the fixed
- *   codes and any code with a single symbol which in deflate is coded as one
- *   bit instead of zero bits.  See the format notes for fixed() and dynamic().
- *
- * - Within a given code length, the symbols are kept in ascending order for
- *   the code bits definition.
- */
-local int construct(struct huffman *h, const short *length, int n)
-{
-    int symbol;         /* current symbol when stepping through length[] */
-    int len;            /* current length when stepping through h->count[] */
-    int left;           /* number of possible codes left of current length */
-    short offs[MAXBITS+1];      /* offsets in symbol table for each length */
-
-    /* count number of codes of each length */
-    for (len = 0; len <= MAXBITS; len++)
-        h->count[len] = 0;
-    for (symbol = 0; symbol < n; symbol++)
-        (h->count[length[symbol]])++;   /* assumes lengths are within bounds */
-    if (h->count[0] == n)               /* no codes! */
-        return 0;                       /* complete, but decode() will fail */
-
-    /* check for an over-subscribed or incomplete set of lengths */
-    left = 1;                           /* one possible code of zero length */
-    for (len = 1; len <= MAXBITS; len++) {
-        left <<= 1;                     /* one more bit, double codes left */
-        left -= h->count[len];          /* deduct count from possible codes */
-        if (left < 0)
-            return left;                /* over-subscribed--return negative */
-    }                                   /* left > 0 means incomplete */
-
-    /* generate offsets into symbol table for each length for sorting */
-    offs[1] = 0;
-    for (len = 1; len < MAXBITS; len++)
-        offs[len + 1] = offs[len] + h->count[len];
-
-    /*
-     * put symbols in table sorted by length, by symbol order within each
-     * length
-     */
-    for (symbol = 0; symbol < n; symbol++)
-        if (length[symbol] != 0)
-            h->symbol[offs[length[symbol]]++] = symbol;
-
-    /* return zero for complete set, positive for incomplete set */
-    return left;
-}
-
-/*
- * Decode literal/length and distance codes until an end-of-block code.
- *
- * Format notes:
- *
- * - Compressed data that is after the block type if fixed or after the code
- *   description if dynamic is a combination of literals and length/distance
- *   pairs terminated by and end-of-block code.  Literals are simply Huffman
- *   coded bytes.  A length/distance pair is a coded length followed by a
- *   coded distance to represent a string that occurs earlier in the
- *   uncompressed data that occurs again at the current location.
- *
- * - Literals, lengths, and the end-of-block code are combined into a single
- *   code of up to 286 symbols.  They are 256 literals (0..255), 29 length
- *   symbols (257..285), and the end-of-block symbol (256).
- *
- * - There are 256 possible lengths (3..258), and so 29 symbols are not enough
- *   to represent all of those.  Lengths 3..10 and 258 are in fact represented
- *   by just a length symbol.  Lengths 11..257 are represented as a symbol and
- *   some number of extra bits that are added as an integer to the base length
- *   of the length symbol.  The number of extra bits is determined by the base
- *   length symbol.  These are in the static arrays below, lens[] for the base
- *   lengths and lext[] for the corresponding number of extra bits.
- *
- * - The reason that 258 gets its own symbol is that the longest length is used
- *   often in highly redundant files.  Note that 258 can also be coded as the
- *   base value 227 plus the maximum extra value of 31.  While a good deflate
- *   should never do this, it is not an error, and should be decoded properly.
- *
- * - If a length is decoded, including its extra bits if any, then it is
- *   followed a distance code.  There are up to 30 distance symbols.  Again
- *   there are many more possible distances (1..32768), so extra bits are added
- *   to a base value represented by the symbol.  The distances 1..4 get their
- *   own symbol, but the rest require extra bits.  The base distances and
- *   corresponding number of extra bits are below in the static arrays dist[]
- *   and dext[].
- *
- * - Literal bytes are simply written to the output.  A length/distance pair is
- *   an instruction to copy previously uncompressed bytes to the output.  The
- *   copy is from distance bytes back in the output stream, copying for length
- *   bytes.
- *
- * - Distances pointing before the beginning of the output data are not
- *   permitted.
- *
- * - Overlapped copies, where the length is greater than the distance, are
- *   allowed and common.  For example, a distance of one and a length of 258
- *   simply copies the last byte 258 times.  A distance of four and a length of
- *   twelve copies the last four bytes three times.  A simple forward copy
- *   ignoring whether the length is greater than the distance or not implements
- *   this correctly.  You should not use memcpy() since its behavior is not
- *   defined for overlapped arrays.  You should not use memmove() or bcopy()
- *   since though their behavior -is- defined for overlapping arrays, it is
- *   defined to do the wrong thing in this case.
- */
-local int codes(struct state *s,
-                const struct huffman *lencode,
-                const struct huffman *distcode)
-{
-    int symbol;         /* decoded symbol */
-    int len;            /* length for copy */
-    unsigned dist;      /* distance for copy */
-    static const short lens[29] = { /* Size base for length codes 257..285 */
-        3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
-        35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258};
-    static const short lext[29] = { /* Extra bits for length codes 257..285 */
-        0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
-        3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0};
-    static const short dists[30] = { /* Offset base for distance codes 0..29 */
-        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
-        257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
-        8193, 12289, 16385, 24577};
-    static const short dext[30] = { /* Extra bits for distance codes 0..29 */
-        0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
-        7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
-        12, 12, 13, 13};
-
-    /* decode literals and length/distance pairs */
-    do {
-        symbol = decode(s, lencode);
-        if (symbol < 0)
-            return symbol;              /* invalid symbol */
-        if (symbol < 256) {             /* literal: symbol is the byte */
-            /* write out the literal */
-            if (s->out != NIL) {
-                if (s->outcnt == s->outlen)
-                    return 1;
-                s->out[s->outcnt] = symbol;
-            }
-            s->outcnt++;
-        }
-        else if (symbol > 256) {        /* length */
-            /* get and compute length */
-            symbol -= 257;
-            if (symbol >= 29)
-                return -10;             /* invalid fixed code */
-            len = lens[symbol] + bits(s, lext[symbol]);
-
-            /* get and check distance */
-            symbol = decode(s, distcode);
-            if (symbol < 0)
-                return symbol;          /* invalid symbol */
-            dist = dists[symbol] + bits(s, dext[symbol]);
-#ifndef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
-            if (dist > s->outcnt)
-                return -11;     /* distance too far back */
-#endif
-
-            /* copy length bytes from distance bytes back */
-            if (s->out != NIL) {
-                if (s->outcnt + len > s->outlen)
-                    return 1;
-                while (len--) {
-                    s->out[s->outcnt] =
-#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
-                        dist > s->outcnt ?
-                            0 :
-#endif
-                            s->out[s->outcnt - dist];
-                    s->outcnt++;
-                }
-            }
-            else
-                s->outcnt += len;
-        }
-    } while (symbol != 256);            /* end of block symbol */
-
-    /* done with a valid fixed or dynamic block */
-    return 0;
-}
-
-/*
- * Process a fixed codes block.
- *
- * Format notes:
- *
- * - This block type can be useful for compressing small amounts of data for
- *   which the size of the code descriptions in a dynamic block exceeds the
- *   benefit of custom codes for that block.  For fixed codes, no bits are
- *   spent on code descriptions.  Instead the code lengths for literal/length
- *   codes and distance codes are fixed.  The specific lengths for each symbol
- *   can be seen in the "for" loops below.
- *
- * - The literal/length code is complete, but has two symbols that are invalid
- *   and should result in an error if received.  This cannot be implemented
- *   simply as an incomplete code since those two symbols are in the "middle"
- *   of the code.  They are eight bits long and the longest literal/length\
- *   code is nine bits.  Therefore the code must be constructed with those
- *   symbols, and the invalid symbols must be detected after decoding.
- *
- * - The fixed distance codes also have two invalid symbols that should result
- *   in an error if received.  Since all of the distance codes are the same
- *   length, this can be implemented as an incomplete code.  Then the invalid
- *   codes are detected while decoding.
- */
-local int fixed(struct state *s)
-{
-    static int virgin = 1;
-    static short lencnt[MAXBITS+1], lensym[FIXLCODES];
-    static short distcnt[MAXBITS+1], distsym[MAXDCODES];
-    static struct huffman lencode, distcode;
-
-    /* build fixed huffman tables if first call (may not be thread safe) */
-    if (virgin) {
-        int symbol;
-        short lengths[FIXLCODES];
-
-        /* construct lencode and distcode */
-        lencode.count = lencnt;
-        lencode.symbol = lensym;
-        distcode.count = distcnt;
-        distcode.symbol = distsym;
-
-        /* literal/length table */
-        for (symbol = 0; symbol < 144; symbol++)
-            lengths[symbol] = 8;
-        for (; symbol < 256; symbol++)
-            lengths[symbol] = 9;
-        for (; symbol < 280; symbol++)
-            lengths[symbol] = 7;
-        for (; symbol < FIXLCODES; symbol++)
-            lengths[symbol] = 8;
-        construct(&lencode, lengths, FIXLCODES);
-
-        /* distance table */
-        for (symbol = 0; symbol < MAXDCODES; symbol++)
-            lengths[symbol] = 5;
-        construct(&distcode, lengths, MAXDCODES);
-
-        /* do this just once */
-        virgin = 0;
-    }
-
-    /* decode data until end-of-block code */
-    return codes(s, &lencode, &distcode);
-}
-
-/*
- * Process a dynamic codes block.
- *
- * Format notes:
- *
- * - A dynamic block starts with a description of the literal/length and
- *   distance codes for that block.  New dynamic blocks allow the compressor to
- *   rapidly adapt to changing data with new codes optimized for that data.
- *
- * - The codes used by the deflate format are "canonical", which means that
- *   the actual bits of the codes are generated in an unambiguous way simply
- *   from the number of bits in each code.  Therefore the code descriptions
- *   are simply a list of code lengths for each symbol.
- *
- * - The code lengths are stored in order for the symbols, so lengths are
- *   provided for each of the literal/length symbols, and for each of the
- *   distance symbols.
- *
- * - If a symbol is not used in the block, this is represented by a zero as
- *   as the code length.  This does not mean a zero-length code, but rather
- *   that no code should be created for this symbol.  There is no way in the
- *   deflate format to represent a zero-length code.
- *
- * - The maximum number of bits in a code is 15, so the possible lengths for
- *   any code are 1..15.
- *
- * - The fact that a length of zero is not permitted for a code has an
- *   interesting consequence.  Normally if only one symbol is used for a given
- *   code, then in fact that code could be represented with zero bits.  However
- *   in deflate, that code has to be at least one bit.  So for example, if
- *   only a single distance base symbol appears in a block, then it will be
- *   represented by a single code of length one, in particular one 0 bit.  This
- *   is an incomplete code, since if a 1 bit is received, it has no meaning,
- *   and should result in an error.  So incomplete distance codes of one symbol
- *   should be permitted, and the receipt of invalid codes should be handled.
- *
- * - It is also possible to have a single literal/length code, but that code
- *   must be the end-of-block code, since every dynamic block has one.  This
- *   is not the most efficient way to create an empty block (an empty fixed
- *   block is fewer bits), but it is allowed by the format.  So incomplete
- *   literal/length codes of one symbol should also be permitted.
- *
- * - If there are only literal codes and no lengths, then there are no distance
- *   codes.  This is represented by one distance code with zero bits.
- *
- * - The list of up to 286 length/literal lengths and up to 30 distance lengths
- *   are themselves compressed using Huffman codes and run-length encoding.  In
- *   the list of code lengths, a 0 symbol means no code, a 1..15 symbol means
- *   that length, and the symbols 16, 17, and 18 are run-length instructions.
- *   Each of 16, 17, and 18 are follwed by extra bits to define the length of
- *   the run.  16 copies the last length 3 to 6 times.  17 represents 3 to 10
- *   zero lengths, and 18 represents 11 to 138 zero lengths.  Unused symbols
- *   are common, hence the special coding for zero lengths.
- *
- * - The symbols for 0..18 are Huffman coded, and so that code must be
- *   described first.  This is simply a sequence of up to 19 three-bit values
- *   representing no code (0) or the code length for that symbol (1..7).
- *
- * - A dynamic block starts with three fixed-size counts from which is computed
- *   the number of literal/length code lengths, the number of distance code
- *   lengths, and the number of code length code lengths (ok, you come up with
- *   a better name!) in the code descriptions.  For the literal/length and
- *   distance codes, lengths after those provided are considered zero, i.e. no
- *   code.  The code length code lengths are received in a permuted order (see
- *   the order[] array below) to make a short code length code length list more
- *   likely.  As it turns out, very short and very long codes are less likely
- *   to be seen in a dynamic code description, hence what may appear initially
- *   to be a peculiar ordering.
- *
- * - Given the number of literal/length code lengths (nlen) and distance code
- *   lengths (ndist), then they are treated as one long list of nlen + ndist
- *   code lengths.  Therefore run-length coding can and often does cross the
- *   boundary between the two sets of lengths.
- *
- * - So to summarize, the code description at the start of a dynamic block is
- *   three counts for the number of code lengths for the literal/length codes,
- *   the distance codes, and the code length codes.  This is followed by the
- *   code length code lengths, three bits each.  This is used to construct the
- *   code length code which is used to read the remainder of the lengths.  Then
- *   the literal/length code lengths and distance lengths are read as a single
- *   set of lengths using the code length codes.  Codes are constructed from
- *   the resulting two sets of lengths, and then finally you can start
- *   decoding actual compressed data in the block.
- *
- * - For reference, a "typical" size for the code description in a dynamic
- *   block is around 80 bytes.
- */
-local int dynamic(struct state *s)
-{
-    int nlen, ndist, ncode;             /* number of lengths in descriptor */
-    int index;                          /* index of lengths[] */
-    int err;                            /* construct() return value */
-    short lengths[MAXCODES];            /* descriptor code lengths */
-    short lencnt[MAXBITS+1], lensym[MAXLCODES];         /* lencode memory */
-    short distcnt[MAXBITS+1], distsym[MAXDCODES];       /* distcode memory */
-    struct huffman lencode, distcode;   /* length and distance codes */
-    static const short order[19] =      /* permutation of code length codes */
-        {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
-
-    /* construct lencode and distcode */
-    lencode.count = lencnt;
-    lencode.symbol = lensym;
-    distcode.count = distcnt;
-    distcode.symbol = distsym;
-
-    /* get number of lengths in each table, check lengths */
-    nlen = bits(s, 5) + 257;
-    ndist = bits(s, 5) + 1;
-    ncode = bits(s, 4) + 4;
-    if (nlen > MAXLCODES || ndist > MAXDCODES)
-        return -3;                      /* bad counts */
-
-    /* read code length code lengths (really), missing lengths are zero */
-    for (index = 0; index < ncode; index++)
-        lengths[order[index]] = bits(s, 3);
-    for (; index < 19; index++)
-        lengths[order[index]] = 0;
-
-    /* build huffman table for code lengths codes (use lencode temporarily) */
-    err = construct(&lencode, lengths, 19);
-    if (err != 0)               /* require complete code set here */
-        return -4;
-
-    /* read length/literal and distance code length tables */
-    index = 0;
-    while (index < nlen + ndist) {
-        int symbol;             /* decoded value */
-        int len;                /* last length to repeat */
-
-        symbol = decode(s, &lencode);
-        if (symbol < 0)
-            return symbol;          /* invalid symbol */
-        if (symbol < 16)                /* length in 0..15 */
-            lengths[index++] = symbol;
-        else {                          /* repeat instruction */
-            len = 0;                    /* assume repeating zeros */
-            if (symbol == 16) {         /* repeat last length 3..6 times */
-                if (index == 0)
-                    return -5;          /* no last length! */
-                len = lengths[index - 1];       /* last length */
-                symbol = 3 + bits(s, 2);
-            }
-            else if (symbol == 17)      /* repeat zero 3..10 times */
-                symbol = 3 + bits(s, 3);
-            else                        /* == 18, repeat zero 11..138 times */
-                symbol = 11 + bits(s, 7);
-            if (index + symbol > nlen + ndist)
-                return -6;              /* too many lengths! */
-            while (symbol--)            /* repeat last or zero symbol times */
-                lengths[index++] = len;
-        }
-    }
-
-    /* check for end-of-block code -- there better be one! */
-    if (lengths[256] == 0)
-        return -9;
-
-    /* build huffman table for literal/length codes */
-    err = construct(&lencode, lengths, nlen);
-    if (err && (err < 0 || nlen != lencode.count[0] + lencode.count[1]))
-        return -7;      /* incomplete code ok only for single length 1 code */
-
-    /* build huffman table for distance codes */
-    err = construct(&distcode, lengths + nlen, ndist);
-    if (err && (err < 0 || ndist != distcode.count[0] + distcode.count[1]))
-        return -8;      /* incomplete code ok only for single length 1 code */
-
-    /* decode data until end-of-block code */
-    return codes(s, &lencode, &distcode);
-}
-
-/*
- * Inflate source to dest.  On return, destlen and sourcelen are updated to the
- * size of the uncompressed data and the size of the deflate data respectively.
- * On success, the return value of puff() is zero.  If there is an error in the
- * source data, i.e. it is not in the deflate format, then a negative value is
- * returned.  If there is not enough input available or there is not enough
- * output space, then a positive error is returned.  In that case, destlen and
- * sourcelen are not updated to facilitate retrying from the beginning with the
- * provision of more input data or more output space.  In the case of invalid
- * inflate data (a negative error), the dest and source pointers are updated to
- * facilitate the debugging of deflators.
- *
- * puff() also has a mode to determine the size of the uncompressed output with
- * no output written.  For this dest must be (unsigned char *)0.  In this case,
- * the input value of *destlen is ignored, and on return *destlen is set to the
- * size of the uncompressed output.
- *
- * The return codes are:
- *
- *   2:  available inflate data did not terminate
- *   1:  output space exhausted before completing inflate
- *   0:  successful inflate
- *  -1:  invalid block type (type == 3)
- *  -2:  stored block length did not match one's complement
- *  -3:  dynamic block code description: too many length or distance codes
- *  -4:  dynamic block code description: code lengths codes incomplete
- *  -5:  dynamic block code description: repeat lengths with no first length
- *  -6:  dynamic block code description: repeat more than specified lengths
- *  -7:  dynamic block code description: invalid literal/length code lengths
- *  -8:  dynamic block code description: invalid distance code lengths
- *  -9:  dynamic block code description: missing end-of-block code
- * -10:  invalid literal/length or distance code in fixed or dynamic block
- * -11:  distance is too far back in fixed or dynamic block
- *
- * Format notes:
- *
- * - Three bits are read for each block to determine the kind of block and
- *   whether or not it is the last block.  Then the block is decoded and the
- *   process repeated if it was not the last block.
- *
- * - The leftover bits in the last byte of the deflate data after the last
- *   block (if it was a fixed or dynamic block) are undefined and have no
- *   expected values to check.
- */
-int puff(unsigned char *dest,           /* pointer to destination pointer */
-         unsigned long *destlen,        /* amount of output space */
-         const unsigned char *source,   /* pointer to source data pointer */
-         unsigned long *sourcelen)      /* amount of input available */
-{
-    struct state s;             /* input/output state */
-    int last, type;             /* block information */
-    int err;                    /* return value */
-
-    /* initialize output state */
-    s.out = dest;
-    s.outlen = *destlen;                /* ignored if dest is NIL */
-    s.outcnt = 0;
-
-    /* initialize input state */
-    s.in = source;
-    s.inlen = *sourcelen;
-    s.incnt = 0;
-    s.bitbuf = 0;
-    s.bitcnt = 0;
-
-    /* return if bits() or decode() tries to read past available input */
-    if (setjmp(s.env) != 0)             /* if came back here via longjmp() */
-        err = 2;                        /* then skip do-loop, return error */
-    else {
-        /* process blocks until last block or error */
-        do {
-            last = bits(&s, 1);         /* one if last block */
-            type = bits(&s, 2);         /* block type 0..3 */
-            err = type == 0 ?
-                    stored(&s) :
-                    (type == 1 ?
-                        fixed(&s) :
-                        (type == 2 ?
-                            dynamic(&s) :
-                            -1));       /* type == 3, invalid */
-            if (err != 0)
-                break;                  /* return with error */
-        } while (!last);
-    }
-
-    /* update the lengths and return */
-    if (err <= 0) {
-        *destlen = s.outcnt;
-        *sourcelen = s.incnt;
-    }
-    return err;
-}
diff --git a/src/png/zlib/contrib/puff/puff.h b/src/png/zlib/contrib/puff/puff.h
deleted file mode 100644
index e23a24543..000000000
--- a/src/png/zlib/contrib/puff/puff.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/* puff.h
-  Copyright (C) 2002-2013 Mark Adler, all rights reserved
-  version 2.3, 21 Jan 2013
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the author be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-
-  Mark Adler    madler@alumni.caltech.edu
- */
-
-
-/*
- * See puff.c for purpose and usage.
- */
-#ifndef NIL
-#  define NIL ((unsigned char *)0)      /* for no output option */
-#endif
-
-int puff(unsigned char *dest,           /* pointer to destination pointer */
-         unsigned long *destlen,        /* amount of output space */
-         const unsigned char *source,   /* pointer to source data pointer */
-         unsigned long *sourcelen);     /* amount of input available */
diff --git a/src/png/zlib/contrib/puff/pufftest.c b/src/png/zlib/contrib/puff/pufftest.c
deleted file mode 100644
index 776481488..000000000
--- a/src/png/zlib/contrib/puff/pufftest.c
+++ /dev/null
@@ -1,165 +0,0 @@
-/*
- * pufftest.c
- * Copyright (C) 2002-2013 Mark Adler
- * For conditions of distribution and use, see copyright notice in puff.h
- * version 2.3, 21 Jan 2013
- */
-
-/* Example of how to use puff().
-
-   Usage: puff [-w] [-f] [-nnn] file
-          ... | puff [-w] [-f] [-nnn]
-
-   where file is the input file with deflate data, nnn is the number of bytes
-   of input to skip before inflating (e.g. to skip a zlib or gzip header), and
-   -w is used to write the decompressed data to stdout.  -f is for coverage
-   testing, and causes pufftest to fail with not enough output space (-f does
-   a write like -w, so -w is not required). */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include "puff.h"
-
-#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
-#  include <fcntl.h>
-#  include <io.h>
-#  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
-#else
-#  define SET_BINARY_MODE(file)
-#endif
-
-#define local static
-
-/* Return size times approximately the cube root of 2, keeping the result as 1,
-   3, or 5 times a power of 2 -- the result is always > size, until the result
-   is the maximum value of an unsigned long, where it remains.  This is useful
-   to keep reallocations less than ~33% over the actual data. */
-local size_t bythirds(size_t size)
-{
-    int n;
-    size_t m;
-
-    m = size;
-    for (n = 0; m; n++)
-        m >>= 1;
-    if (n < 3)
-        return size + 1;
-    n -= 3;
-    m = size >> n;
-    m += m == 6 ? 2 : 1;
-    m <<= n;
-    return m > size ? m : (size_t)(-1);
-}
-
-/* Read the input file *name, or stdin if name is NULL, into allocated memory.
-   Reallocate to larger buffers until the entire file is read in.  Return a
-   pointer to the allocated data, or NULL if there was a memory allocation
-   failure.  *len is the number of bytes of data read from the input file (even
-   if load() returns NULL).  If the input file was empty or could not be opened
-   or read, *len is zero. */
-local void *load(const char *name, size_t *len)
-{
-    size_t size;
-    void *buf, *swap;
-    FILE *in;
-
-    *len = 0;
-    buf = malloc(size = 4096);
-    if (buf == NULL)
-        return NULL;
-    in = name == NULL ? stdin : fopen(name, "rb");
-    if (in != NULL) {
-        for (;;) {
-            *len += fread((char *)buf + *len, 1, size - *len, in);
-            if (*len < size) break;
-            size = bythirds(size);
-            if (size == *len || (swap = realloc(buf, size)) == NULL) {
-                free(buf);
-                buf = NULL;
-                break;
-            }
-            buf = swap;
-        }
-        fclose(in);
-    }
-    return buf;
-}
-
-int main(int argc, char **argv)
-{
-    int ret, put = 0, fail = 0;
-    unsigned skip = 0;
-    char *arg, *name = NULL;
-    unsigned char *source = NULL, *dest;
-    size_t len = 0;
-    unsigned long sourcelen, destlen;
-
-    /* process arguments */
-    while (arg = *++argv, --argc)
-        if (arg[0] == '-') {
-            if (arg[1] == 'w' && arg[2] == 0)
-                put = 1;
-            else if (arg[1] == 'f' && arg[2] == 0)
-                fail = 1, put = 1;
-            else if (arg[1] >= '0' && arg[1] <= '9')
-                skip = (unsigned)atoi(arg + 1);
-            else {
-                fprintf(stderr, "invalid option %s\n", arg);
-                return 3;
-            }
-        }
-        else if (name != NULL) {
-            fprintf(stderr, "only one file name allowed\n");
-            return 3;
-        }
-        else
-            name = arg;
-    source = load(name, &len);
-    if (source == NULL) {
-        fprintf(stderr, "memory allocation failure\n");
-        return 4;
-    }
-    if (len == 0) {
-        fprintf(stderr, "could not read %s, or it was empty\n",
-                name == NULL ? "<stdin>" : name);
-        free(source);
-        return 3;
-    }
-    if (skip >= len) {
-        fprintf(stderr, "skip request of %d leaves no input\n", skip);
-        free(source);
-        return 3;
-    }
-
-    /* test inflate data with offset skip */
-    len -= skip;
-    sourcelen = (unsigned long)len;
-    ret = puff(NIL, &destlen, source + skip, &sourcelen);
-    if (ret)
-        fprintf(stderr, "puff() failed with return code %d\n", ret);
-    else {
-        fprintf(stderr, "puff() succeeded uncompressing %lu bytes\n", destlen);
-        if (sourcelen < len) fprintf(stderr, "%lu compressed bytes unused\n",
-                                     len - sourcelen);
-    }
-
-    /* if requested, inflate again and write decompressd data to stdout */
-    if (put && ret == 0) {
-        if (fail)
-            destlen >>= 1;
-        dest = malloc(destlen);
-        if (dest == NULL) {
-            fprintf(stderr, "memory allocation failure\n");
-            free(source);
-            return 4;
-        }
-        puff(dest, &destlen, source + skip, &sourcelen);
-        SET_BINARY_MODE(stdout);
-        fwrite(dest, 1, destlen, stdout);
-        free(dest);
-    }
-
-    /* clean up */
-    free(source);
-    return ret;
-}
diff --git a/src/png/zlib/contrib/puff/zeros.raw b/src/png/zlib/contrib/puff/zeros.raw
deleted file mode 100644
index 0a90e76b3..000000000
--- a/src/png/zlib/contrib/puff/zeros.raw
+++ /dev/null
diff --git a/src/png/zlib/contrib/testzlib/testzlib.c b/src/png/zlib/contrib/testzlib/testzlib.c
deleted file mode 100644
index 8626c92ad..000000000
--- a/src/png/zlib/contrib/testzlib/testzlib.c
+++ /dev/null
@@ -1,275 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <windows.h>
-
-#include "zlib.h"
-
-
-void MyDoMinus64(LARGE_INTEGER *R,LARGE_INTEGER A,LARGE_INTEGER B)
-{
-    R->HighPart = A.HighPart - B.HighPart;
-    if (A.LowPart >= B.LowPart)
-        R->LowPart = A.LowPart - B.LowPart;
-    else
-    {
-        R->LowPart = A.LowPart - B.LowPart;
-        R->HighPart --;
-    }
-}
-
-#ifdef _M_X64
-// see http://msdn2.microsoft.com/library/twchhe95(en-us,vs.80).aspx for __rdtsc
-unsigned __int64 __rdtsc(void);
-void BeginCountRdtsc(LARGE_INTEGER * pbeginTime64)
-{
- //   printf("rdtsc = %I64x\n",__rdtsc());
-   pbeginTime64->QuadPart=__rdtsc();
-}
-
-LARGE_INTEGER GetResRdtsc(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
-{
-    LARGE_INTEGER LIres;
-    unsigned _int64 res=__rdtsc()-((unsigned _int64)(beginTime64.QuadPart));
-    LIres.QuadPart=res;
-   // printf("rdtsc = %I64x\n",__rdtsc());
-    return LIres;
-}
-#else
-#ifdef _M_IX86
-void myGetRDTSC32(LARGE_INTEGER * pbeginTime64)
-{
-    DWORD dwEdx,dwEax;
-    _asm
-    {
-        rdtsc
-        mov dwEax,eax
-        mov dwEdx,edx
-    }
-    pbeginTime64->LowPart=dwEax;
-    pbeginTime64->HighPart=dwEdx;
-}
-
-void BeginCountRdtsc(LARGE_INTEGER * pbeginTime64)
-{
-    myGetRDTSC32(pbeginTime64);
-}
-
-LARGE_INTEGER GetResRdtsc(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
-{
-    LARGE_INTEGER LIres,endTime64;
-    myGetRDTSC32(&endTime64);
-
-    LIres.LowPart=LIres.HighPart=0;
-    MyDoMinus64(&LIres,endTime64,beginTime64);
-    return LIres;
-}
-#else
-void myGetRDTSC32(LARGE_INTEGER * pbeginTime64)
-{
-}
-
-void BeginCountRdtsc(LARGE_INTEGER * pbeginTime64)
-{
-}
-
-LARGE_INTEGER GetResRdtsc(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
-{
-    LARGE_INTEGER lr;
-    lr.QuadPart=0;
-    return lr;
-}
-#endif
-#endif
-
-void BeginCountPerfCounter(LARGE_INTEGER * pbeginTime64,BOOL fComputeTimeQueryPerf)
-{
-    if ((!fComputeTimeQueryPerf) || (!QueryPerformanceCounter(pbeginTime64)))
-    {
-        pbeginTime64->LowPart = GetTickCount();
-        pbeginTime64->HighPart = 0;
-    }
-}
-
-DWORD GetMsecSincePerfCounter(LARGE_INTEGER beginTime64,BOOL fComputeTimeQueryPerf)
-{
-    LARGE_INTEGER endTime64,ticksPerSecond,ticks;
-    DWORDLONG ticksShifted,tickSecShifted;
-    DWORD dwLog=16+0;
-    DWORD dwRet;
-    if ((!fComputeTimeQueryPerf) || (!QueryPerformanceCounter(&endTime64)))
-        dwRet = (GetTickCount() - beginTime64.LowPart)*1;
-    else
-    {
-        MyDoMinus64(&ticks,endTime64,beginTime64);
-        QueryPerformanceFrequency(&ticksPerSecond);
-
-
-        {
-            ticksShifted = Int64ShrlMod32(*(DWORDLONG*)&ticks,dwLog);
-            tickSecShifted = Int64ShrlMod32(*(DWORDLONG*)&ticksPerSecond,dwLog);
-
-        }
-
-        dwRet = (DWORD)((((DWORD)ticksShifted)*1000)/(DWORD)(tickSecShifted));
-        dwRet *=1;
-    }
-    return dwRet;
-}
-
-int ReadFileMemory(const char* filename,long* plFileSize,unsigned char** pFilePtr)
-{
-    FILE* stream;
-    unsigned char* ptr;
-    int retVal=1;
-    stream=fopen(filename, "rb");
-    if (stream==NULL)
-        return 0;
-
-    fseek(stream,0,SEEK_END);
-
-    *plFileSize=ftell(stream);
-    fseek(stream,0,SEEK_SET);
-    ptr=malloc((*plFileSize)+1);
-    if (ptr==NULL)
-        retVal=0;
-    else
-    {
-        if (fread(ptr, 1, *plFileSize,stream) != (*plFileSize))
-            retVal=0;
-    }
-    fclose(stream);
-    *pFilePtr=ptr;
-    return retVal;
-}
-
-int main(int argc, char *argv[])
-{
-    int BlockSizeCompress=0x8000;
-    int BlockSizeUncompress=0x8000;
-    int cprLevel=Z_DEFAULT_COMPRESSION ;
-    long lFileSize;
-    unsigned char* FilePtr;
-    long lBufferSizeCpr;
-    long lBufferSizeUncpr;
-    long lCompressedSize=0;
-    unsigned char* CprPtr;
-    unsigned char* UncprPtr;
-    long lSizeCpr,lSizeUncpr;
-    DWORD dwGetTick,dwMsecQP;
-    LARGE_INTEGER li_qp,li_rdtsc,dwResRdtsc;
-
-    if (argc<=1)
-    {
-        printf("run TestZlib <File> [BlockSizeCompress] [BlockSizeUncompress] [compres. level]\n");
-        return 0;
-    }
-
-    if (ReadFileMemory(argv[1],&lFileSize,&FilePtr)==0)
-    {
-        printf("error reading %s\n",argv[1]);
-        return 1;
-    }
-    else printf("file %s read, %u bytes\n",argv[1],lFileSize);
-
-    if (argc>=3)
-        BlockSizeCompress=atol(argv[2]);
-
-    if (argc>=4)
-        BlockSizeUncompress=atol(argv[3]);
-
-    if (argc>=5)
-        cprLevel=(int)atol(argv[4]);
-
-    lBufferSizeCpr = lFileSize + (lFileSize/0x10) + 0x200;
-    lBufferSizeUncpr = lBufferSizeCpr;
-
-    CprPtr=(unsigned char*)malloc(lBufferSizeCpr + BlockSizeCompress);
-
-    BeginCountPerfCounter(&li_qp,TRUE);
-    dwGetTick=GetTickCount();
-    BeginCountRdtsc(&li_rdtsc);
-    {
-        z_stream zcpr;
-        int ret=Z_OK;
-        long lOrigToDo = lFileSize;
-        long lOrigDone = 0;
-        int step=0;
-        memset(&zcpr,0,sizeof(z_stream));
-        deflateInit(&zcpr,cprLevel);
-
-        zcpr.next_in = FilePtr;
-        zcpr.next_out = CprPtr;
-
-
-        do
-        {
-            long all_read_before = zcpr.total_in;
-            zcpr.avail_in = min(lOrigToDo,BlockSizeCompress);
-            zcpr.avail_out = BlockSizeCompress;
-            ret=deflate(&zcpr,(zcpr.avail_in==lOrigToDo) ? Z_FINISH : Z_SYNC_FLUSH);
-            lOrigDone += (zcpr.total_in-all_read_before);
-            lOrigToDo -= (zcpr.total_in-all_read_before);
-            step++;
-        } while (ret==Z_OK);
-
-        lSizeCpr=zcpr.total_out;
-        deflateEnd(&zcpr);
-        dwGetTick=GetTickCount()-dwGetTick;
-        dwMsecQP=GetMsecSincePerfCounter(li_qp,TRUE);
-        dwResRdtsc=GetResRdtsc(li_rdtsc,TRUE);
-        printf("total compress size = %u, in %u step\n",lSizeCpr,step);
-        printf("time = %u msec = %f sec\n",dwGetTick,dwGetTick/(double)1000.);
-        printf("defcpr time QP = %u msec = %f sec\n",dwMsecQP,dwMsecQP/(double)1000.);
-        printf("defcpr result rdtsc = %I64x\n\n",dwResRdtsc.QuadPart);
-    }
-
-    CprPtr=(unsigned char*)realloc(CprPtr,lSizeCpr);
-    UncprPtr=(unsigned char*)malloc(lBufferSizeUncpr + BlockSizeUncompress);
-
-    BeginCountPerfCounter(&li_qp,TRUE);
-    dwGetTick=GetTickCount();
-    BeginCountRdtsc(&li_rdtsc);
-    {
-        z_stream zcpr;
-        int ret=Z_OK;
-        long lOrigToDo = lSizeCpr;
-        long lOrigDone = 0;
-        int step=0;
-        memset(&zcpr,0,sizeof(z_stream));
-        inflateInit(&zcpr);
-
-        zcpr.next_in = CprPtr;
-        zcpr.next_out = UncprPtr;
-
-
-        do
-        {
-            long all_read_before = zcpr.total_in;
-            zcpr.avail_in = min(lOrigToDo,BlockSizeUncompress);
-            zcpr.avail_out = BlockSizeUncompress;
-            ret=inflate(&zcpr,Z_SYNC_FLUSH);
-            lOrigDone += (zcpr.total_in-all_read_before);
-            lOrigToDo -= (zcpr.total_in-all_read_before);
-            step++;
-        } while (ret==Z_OK);
-
-        lSizeUncpr=zcpr.total_out;
-        inflateEnd(&zcpr);
-        dwGetTick=GetTickCount()-dwGetTick;
-        dwMsecQP=GetMsecSincePerfCounter(li_qp,TRUE);
-        dwResRdtsc=GetResRdtsc(li_rdtsc,TRUE);
-        printf("total uncompress size = %u, in %u step\n",lSizeUncpr,step);
-        printf("time = %u msec = %f sec\n",dwGetTick,dwGetTick/(double)1000.);
-        printf("uncpr  time QP = %u msec = %f sec\n",dwMsecQP,dwMsecQP/(double)1000.);
-        printf("uncpr  result rdtsc = %I64x\n\n",dwResRdtsc.QuadPart);
-    }
-
-    if (lSizeUncpr==lFileSize)
-    {
-        if (memcmp(FilePtr,UncprPtr,lFileSize)==0)
-            printf("compare ok\n");
-
-    }
-
-    return 0;
-}
diff --git a/src/png/zlib/contrib/testzlib/testzlib.txt b/src/png/zlib/contrib/testzlib/testzlib.txt
deleted file mode 100644
index e508bb22f..000000000
--- a/src/png/zlib/contrib/testzlib/testzlib.txt
+++ /dev/null
@@ -1,10 +0,0 @@
-To build testzLib with Visual Studio 2005:
-
-copy to a directory file from :
-- root of zLib tree
-- contrib/testzlib
-- contrib/masmx86
-- contrib/masmx64
-- contrib/vstudio/vc7
-
-and open testzlib8.sln
\ No newline at end of file
diff --git a/src/png/zlib/contrib/untgz/Makefile b/src/png/zlib/contrib/untgz/Makefile
deleted file mode 100644
index b54266fba..000000000
--- a/src/png/zlib/contrib/untgz/Makefile
+++ /dev/null
@@ -1,14 +0,0 @@
-CC=cc
-CFLAGS=-g
-
-untgz: untgz.o ../../libz.a
-	$(CC) $(CFLAGS) -o untgz untgz.o -L../.. -lz
-
-untgz.o: untgz.c ../../zlib.h
-	$(CC) $(CFLAGS) -c -I../.. untgz.c
-
-../../libz.a:
-	cd ../..; ./configure; make
-
-clean:
-	rm -f untgz untgz.o *~
diff --git a/src/png/zlib/contrib/untgz/Makefile.msc b/src/png/zlib/contrib/untgz/Makefile.msc
deleted file mode 100644
index 77b860221..000000000
--- a/src/png/zlib/contrib/untgz/Makefile.msc
+++ /dev/null
@@ -1,17 +0,0 @@
-CC=cl
-CFLAGS=-MD
-
-untgz.exe: untgz.obj ..\..\zlib.lib
-	$(CC) $(CFLAGS) untgz.obj ..\..\zlib.lib
-
-untgz.obj: untgz.c ..\..\zlib.h
-	$(CC) $(CFLAGS) -c -I..\.. untgz.c
-
-..\..\zlib.lib:
-	cd ..\..
-	$(MAKE) -f win32\makefile.msc
-	cd contrib\untgz
-
-clean:
-	-del untgz.obj
-	-del untgz.exe
diff --git a/src/png/zlib/contrib/untgz/untgz.c b/src/png/zlib/contrib/untgz/untgz.c
deleted file mode 100644
index 2c391e598..000000000
--- a/src/png/zlib/contrib/untgz/untgz.c
+++ /dev/null
@@ -1,674 +0,0 @@
-/*
- * untgz.c -- Display contents and extract files from a gzip'd TAR file
- *
- * written by Pedro A. Aranda Gutierrez <paag@tid.es>
- * adaptation to Unix by Jean-loup Gailly <jloup@gzip.org>
- * various fixes by Cosmin Truta <cosmint@cs.ubbcluj.ro>
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include <errno.h>
-
-#include "zlib.h"
-
-#ifdef unix
-#  include <unistd.h>
-#else
-#  include <direct.h>
-#  include <io.h>
-#endif
-
-#ifdef WIN32
-#include <windows.h>
-#  ifndef F_OK
-#    define F_OK  0
-#  endif
-#  define mkdir(dirname,mode)   _mkdir(dirname)
-#  ifdef _MSC_VER
-#    define access(path,mode)   _access(path,mode)
-#    define chmod(path,mode)    _chmod(path,mode)
-#    define strdup(str)         _strdup(str)
-#  endif
-#else
-#  include <utime.h>
-#endif
-
-
-/* values used in typeflag field */
-
-#define REGTYPE  '0'            /* regular file */
-#define AREGTYPE '\0'           /* regular file */
-#define LNKTYPE  '1'            /* link */
-#define SYMTYPE  '2'            /* reserved */
-#define CHRTYPE  '3'            /* character special */
-#define BLKTYPE  '4'            /* block special */
-#define DIRTYPE  '5'            /* directory */
-#define FIFOTYPE '6'            /* FIFO special */
-#define CONTTYPE '7'            /* reserved */
-
-/* GNU tar extensions */
-
-#define GNUTYPE_DUMPDIR  'D'    /* file names from dumped directory */
-#define GNUTYPE_LONGLINK 'K'    /* long link name */
-#define GNUTYPE_LONGNAME 'L'    /* long file name */
-#define GNUTYPE_MULTIVOL 'M'    /* continuation of file from another volume */
-#define GNUTYPE_NAMES    'N'    /* file name that does not fit into main hdr */
-#define GNUTYPE_SPARSE   'S'    /* sparse file */
-#define GNUTYPE_VOLHDR   'V'    /* tape/volume header */
-
-
-/* tar header */
-
-#define BLOCKSIZE     512
-#define SHORTNAMESIZE 100
-
-struct tar_header
-{                               /* byte offset */
-  char name[100];               /*   0 */
-  char mode[8];                 /* 100 */
-  char uid[8];                  /* 108 */
-  char gid[8];                  /* 116 */
-  char size[12];                /* 124 */
-  char mtime[12];               /* 136 */
-  char chksum[8];               /* 148 */
-  char typeflag;                /* 156 */
-  char linkname[100];           /* 157 */
-  char magic[6];                /* 257 */
-  char version[2];              /* 263 */
-  char uname[32];               /* 265 */
-  char gname[32];               /* 297 */
-  char devmajor[8];             /* 329 */
-  char devminor[8];             /* 337 */
-  char prefix[155];             /* 345 */
-                                /* 500 */
-};
-
-union tar_buffer
-{
-  char               buffer[BLOCKSIZE];
-  struct tar_header  header;
-};
-
-struct attr_item
-{
-  struct attr_item  *next;
-  char              *fname;
-  int                mode;
-  time_t             time;
-};
-
-enum { TGZ_EXTRACT, TGZ_LIST, TGZ_INVALID };
-
-char *TGZfname          OF((const char *));
-void TGZnotfound        OF((const char *));
-
-int getoct              OF((char *, int));
-char *strtime           OF((time_t *));
-int setfiletime         OF((char *, time_t));
-void push_attr          OF((struct attr_item **, char *, int, time_t));
-void restore_attr       OF((struct attr_item **));
-
-int ExprMatch           OF((char *, char *));
-
-int makedir             OF((char *));
-int matchname           OF((int, int, char **, char *));
-
-void error              OF((const char *));
-int tar                 OF((gzFile, int, int, int, char **));
-
-void help               OF((int));
-int main                OF((int, char **));
-
-char *prog;
-
-const char *TGZsuffix[] = { "\0", ".tar", ".tar.gz", ".taz", ".tgz", NULL };
-
-/* return the file name of the TGZ archive */
-/* or NULL if it does not exist */
-
-char *TGZfname (const char *arcname)
-{
-  static char buffer[1024];
-  int origlen,i;
-
-  strcpy(buffer,arcname);
-  origlen = strlen(buffer);
-
-  for (i=0; TGZsuffix[i]; i++)
-    {
-       strcpy(buffer+origlen,TGZsuffix[i]);
-       if (access(buffer,F_OK) == 0)
-         return buffer;
-    }
-  return NULL;
-}
-
-
-/* error message for the filename */
-
-void TGZnotfound (const char *arcname)
-{
-  int i;
-
-  fprintf(stderr,"%s: Couldn't find ",prog);
-  for (i=0;TGZsuffix[i];i++)
-    fprintf(stderr,(TGZsuffix[i+1]) ? "%s%s, " : "or %s%s\n",
-            arcname,
-            TGZsuffix[i]);
-  exit(1);
-}
-
-
-/* convert octal digits to int */
-/* on error return -1 */
-
-int getoct (char *p,int width)
-{
-  int result = 0;
-  char c;
-
-  while (width--)
-    {
-      c = *p++;
-      if (c == 0)
-        break;
-      if (c == ' ')
-        continue;
-      if (c < '0' || c > '7')
-        return -1;
-      result = result * 8 + (c - '0');
-    }
-  return result;
-}
-
-
-/* convert time_t to string */
-/* use the "YYYY/MM/DD hh:mm:ss" format */
-
-char *strtime (time_t *t)
-{
-  struct tm   *local;
-  static char result[32];
-
-  local = localtime(t);
-  sprintf(result,"%4d/%02d/%02d %02d:%02d:%02d",
-          local->tm_year+1900, local->tm_mon+1, local->tm_mday,
-          local->tm_hour, local->tm_min, local->tm_sec);
-  return result;
-}
-
-
-/* set file time */
-
-int setfiletime (char *fname,time_t ftime)
-{
-#ifdef WIN32
-  static int isWinNT = -1;
-  SYSTEMTIME st;
-  FILETIME locft, modft;
-  struct tm *loctm;
-  HANDLE hFile;
-  int result;
-
-  loctm = localtime(&ftime);
-  if (loctm == NULL)
-    return -1;
-
-  st.wYear         = (WORD)loctm->tm_year + 1900;
-  st.wMonth        = (WORD)loctm->tm_mon + 1;
-  st.wDayOfWeek    = (WORD)loctm->tm_wday;
-  st.wDay          = (WORD)loctm->tm_mday;
-  st.wHour         = (WORD)loctm->tm_hour;
-  st.wMinute       = (WORD)loctm->tm_min;
-  st.wSecond       = (WORD)loctm->tm_sec;
-  st.wMilliseconds = 0;
-  if (!SystemTimeToFileTime(&st, &locft) ||
-      !LocalFileTimeToFileTime(&locft, &modft))
-    return -1;
-
-  if (isWinNT < 0)
-    isWinNT = (GetVersion() < 0x80000000) ? 1 : 0;
-  hFile = CreateFile(fname, GENERIC_WRITE, 0, NULL, OPEN_EXISTING,
-                     (isWinNT ? FILE_FLAG_BACKUP_SEMANTICS : 0),
-                     NULL);
-  if (hFile == INVALID_HANDLE_VALUE)
-    return -1;
-  result = SetFileTime(hFile, NULL, NULL, &modft) ? 0 : -1;
-  CloseHandle(hFile);
-  return result;
-#else
-  struct utimbuf settime;
-
-  settime.actime = settime.modtime = ftime;
-  return utime(fname,&settime);
-#endif
-}
-
-
-/* push file attributes */
-
-void push_attr(struct attr_item **list,char *fname,int mode,time_t time)
-{
-  struct attr_item *item;
-
-  item = (struct attr_item *)malloc(sizeof(struct attr_item));
-  if (item == NULL)
-    error("Out of memory");
-  item->fname = strdup(fname);
-  item->mode  = mode;
-  item->time  = time;
-  item->next  = *list;
-  *list       = item;
-}
-
-
-/* restore file attributes */
-
-void restore_attr(struct attr_item **list)
-{
-  struct attr_item *item, *prev;
-
-  for (item = *list; item != NULL; )
-    {
-      setfiletime(item->fname,item->time);
-      chmod(item->fname,item->mode);
-      prev = item;
-      item = item->next;
-      free(prev);
-    }
-  *list = NULL;
-}
-
-
-/* match regular expression */
-
-#define ISSPECIAL(c) (((c) == '*') || ((c) == '/'))
-
-int ExprMatch (char *string,char *expr)
-{
-  while (1)
-    {
-      if (ISSPECIAL(*expr))
-        {
-          if (*expr == '/')
-            {
-              if (*string != '\\' && *string != '/')
-                return 0;
-              string ++; expr++;
-            }
-          else if (*expr == '*')
-            {
-              if (*expr ++ == 0)
-                return 1;
-              while (*++string != *expr)
-                if (*string == 0)
-                  return 0;
-            }
-        }
-      else
-        {
-          if (*string != *expr)
-            return 0;
-          if (*expr++ == 0)
-            return 1;
-          string++;
-        }
-    }
-}
-
-
-/* recursive mkdir */
-/* abort on ENOENT; ignore other errors like "directory already exists" */
-/* return 1 if OK */
-/*        0 on error */
-
-int makedir (char *newdir)
-{
-  char *buffer = strdup(newdir);
-  char *p;
-  int  len = strlen(buffer);
-
-  if (len <= 0) {
-    free(buffer);
-    return 0;
-  }
-  if (buffer[len-1] == '/') {
-    buffer[len-1] = '\0';
-  }
-  if (mkdir(buffer, 0755) == 0)
-    {
-      free(buffer);
-      return 1;
-    }
-
-  p = buffer+1;
-  while (1)
-    {
-      char hold;
-
-      while(*p && *p != '\\' && *p != '/')
-        p++;
-      hold = *p;
-      *p = 0;
-      if ((mkdir(buffer, 0755) == -1) && (errno == ENOENT))
-        {
-          fprintf(stderr,"%s: Couldn't create directory %s\n",prog,buffer);
-          free(buffer);
-          return 0;
-        }
-      if (hold == 0)
-        break;
-      *p++ = hold;
-    }
-  free(buffer);
-  return 1;
-}
-
-
-int matchname (int arg,int argc,char **argv,char *fname)
-{
-  if (arg == argc)      /* no arguments given (untgz tgzarchive) */
-    return 1;
-
-  while (arg < argc)
-    if (ExprMatch(fname,argv[arg++]))
-      return 1;
-
-  return 0; /* ignore this for the moment being */
-}
-
-
-/* tar file list or extract */
-
-int tar (gzFile in,int action,int arg,int argc,char **argv)
-{
-  union  tar_buffer buffer;
-  int    len;
-  int    err;
-  int    getheader = 1;
-  int    remaining = 0;
-  FILE   *outfile = NULL;
-  char   fname[BLOCKSIZE];
-  int    tarmode;
-  time_t tartime;
-  struct attr_item *attributes = NULL;
-
-  if (action == TGZ_LIST)
-    printf("    date      time     size                       file\n"
-           " ---------- -------- --------- -------------------------------------\n");
-  while (1)
-    {
-      len = gzread(in, &buffer, BLOCKSIZE);
-      if (len < 0)
-        error(gzerror(in, &err));
-      /*
-       * Always expect complete blocks to process
-       * the tar information.
-       */
-      if (len != BLOCKSIZE)
-        {
-          action = TGZ_INVALID; /* force error exit */
-          remaining = 0;        /* force I/O cleanup */
-        }
-
-      /*
-       * If we have to get a tar header
-       */
-      if (getheader >= 1)
-        {
-          /*
-           * if we met the end of the tar
-           * or the end-of-tar block,
-           * we are done
-           */
-          if (len == 0 || buffer.header.name[0] == 0)
-            break;
-
-          tarmode = getoct(buffer.header.mode,8);
-          tartime = (time_t)getoct(buffer.header.mtime,12);
-          if (tarmode == -1 || tartime == (time_t)-1)
-            {
-              buffer.header.name[0] = 0;
-              action = TGZ_INVALID;
-            }
-
-          if (getheader == 1)
-            {
-              strncpy(fname,buffer.header.name,SHORTNAMESIZE);
-              if (fname[SHORTNAMESIZE-1] != 0)
-                  fname[SHORTNAMESIZE] = 0;
-            }
-          else
-            {
-              /*
-               * The file name is longer than SHORTNAMESIZE
-               */
-              if (strncmp(fname,buffer.header.name,SHORTNAMESIZE-1) != 0)
-                  error("bad long name");
-              getheader = 1;
-            }
-
-          /*
-           * Act according to the type flag
-           */
-          switch (buffer.header.typeflag)
-            {
-            case DIRTYPE:
-              if (action == TGZ_LIST)
-                printf(" %s     <dir> %s\n",strtime(&tartime),fname);
-              if (action == TGZ_EXTRACT)
-                {
-                  makedir(fname);
-                  push_attr(&attributes,fname,tarmode,tartime);
-                }
-              break;
-            case REGTYPE:
-            case AREGTYPE:
-              remaining = getoct(buffer.header.size,12);
-              if (remaining == -1)
-                {
-                  action = TGZ_INVALID;
-                  break;
-                }
-              if (action == TGZ_LIST)
-                printf(" %s %9d %s\n",strtime(&tartime),remaining,fname);
-              else if (action == TGZ_EXTRACT)
-                {
-                  if (matchname(arg,argc,argv,fname))
-                    {
-                      outfile = fopen(fname,"wb");
-                      if (outfile == NULL) {
-                        /* try creating directory */
-                        char *p = strrchr(fname, '/');
-                        if (p != NULL) {
-                          *p = '\0';
-                          makedir(fname);
-                          *p = '/';
-                          outfile = fopen(fname,"wb");
-                        }
-                      }
-                      if (outfile != NULL)
-                        printf("Extracting %s\n",fname);
-                      else
-                        fprintf(stderr, "%s: Couldn't create %s",prog,fname);
-                    }
-                  else
-                    outfile = NULL;
-                }
-              getheader = 0;
-              break;
-            case GNUTYPE_LONGLINK:
-            case GNUTYPE_LONGNAME:
-              remaining = getoct(buffer.header.size,12);
-              if (remaining < 0 || remaining >= BLOCKSIZE)
-                {
-                  action = TGZ_INVALID;
-                  break;
-                }
-              len = gzread(in, fname, BLOCKSIZE);
-              if (len < 0)
-                error(gzerror(in, &err));
-              if (fname[BLOCKSIZE-1] != 0 || (int)strlen(fname) > remaining)
-                {
-                  action = TGZ_INVALID;
-                  break;
-                }
-              getheader = 2;
-              break;
-            default:
-              if (action == TGZ_LIST)
-                printf(" %s     <---> %s\n",strtime(&tartime),fname);
-              break;
-            }
-        }
-      else
-        {
-          unsigned int bytes = (remaining > BLOCKSIZE) ? BLOCKSIZE : remaining;
-
-          if (outfile != NULL)
-            {
-              if (fwrite(&buffer,sizeof(char),bytes,outfile) != bytes)
-                {
-                  fprintf(stderr,
-                    "%s: Error writing %s -- skipping\n",prog,fname);
-                  fclose(outfile);
-                  outfile = NULL;
-                  remove(fname);
-                }
-            }
-          remaining -= bytes;
-        }
-
-      if (remaining == 0)
-        {
-          getheader = 1;
-          if (outfile != NULL)
-            {
-              fclose(outfile);
-              outfile = NULL;
-              if (action != TGZ_INVALID)
-                push_attr(&attributes,fname,tarmode,tartime);
-            }
-        }
-
-      /*
-       * Abandon if errors are found
-       */
-      if (action == TGZ_INVALID)
-        {
-          error("broken archive");
-          break;
-        }
-    }
-
-  /*
-   * Restore file modes and time stamps
-   */
-  restore_attr(&attributes);
-
-  if (gzclose(in) != Z_OK)
-    error("failed gzclose");
-
-  return 0;
-}
-
-
-/* ============================================================ */
-
-void help(int exitval)
-{
-  printf("untgz version 0.2.1\n"
-         "  using zlib version %s\n\n",
-         zlibVersion());
-  printf("Usage: untgz file.tgz            extract all files\n"
-         "       untgz file.tgz fname ...  extract selected files\n"
-         "       untgz -l file.tgz         list archive contents\n"
-         "       untgz -h                  display this help\n");
-  exit(exitval);
-}
-
-void error(const char *msg)
-{
-  fprintf(stderr, "%s: %s\n", prog, msg);
-  exit(1);
-}
-
-
-/* ============================================================ */
-
-#if defined(WIN32) && defined(__GNUC__)
-int _CRT_glob = 0;      /* disable argument globbing in MinGW */
-#endif
-
-int main(int argc,char **argv)
-{
-    int         action = TGZ_EXTRACT;
-    int         arg = 1;
-    char        *TGZfile;
-    gzFile      *f;
-
-    prog = strrchr(argv[0],'\\');
-    if (prog == NULL)
-      {
-        prog = strrchr(argv[0],'/');
-        if (prog == NULL)
-          {
-            prog = strrchr(argv[0],':');
-            if (prog == NULL)
-              prog = argv[0];
-            else
-              prog++;
-          }
-        else
-          prog++;
-      }
-    else
-      prog++;
-
-    if (argc == 1)
-      help(0);
-
-    if (strcmp(argv[arg],"-l") == 0)
-      {
-        action = TGZ_LIST;
-        if (argc == ++arg)
-          help(0);
-      }
-    else if (strcmp(argv[arg],"-h") == 0)
-      {
-        help(0);
-      }
-
-    if ((TGZfile = TGZfname(argv[arg])) == NULL)
-      TGZnotfound(argv[arg]);
-
-    ++arg;
-    if ((action == TGZ_LIST) && (arg != argc))
-      help(1);
-
-/*
- *  Process the TGZ file
- */
-    switch(action)
-      {
-      case TGZ_LIST:
-      case TGZ_EXTRACT:
-        f = gzopen(TGZfile,"rb");
-        if (f == NULL)
-          {
-            fprintf(stderr,"%s: Couldn't gzopen %s\n",prog,TGZfile);
-            return 1;
-          }
-        exit(tar(f, action, arg, argc, argv));
-      break;
-
-      default:
-        error("Unknown option");
-        exit(1);
-      }
-
-    return 0;
-}
diff --git a/src/png/zlib/contrib/vstudio/readme.txt b/src/png/zlib/contrib/vstudio/readme.txt
deleted file mode 100644
index 48cccc0d2..000000000
--- a/src/png/zlib/contrib/vstudio/readme.txt
+++ /dev/null
@@ -1,78 +0,0 @@
-Building instructions for the DLL versions of Zlib 1.2.11
-========================================================
-
-This directory contains projects that build zlib and minizip using
-Microsoft Visual C++ 9.0/10.0.
-
-You don't need to build these projects yourself. You can download the
-binaries from:
-  http://www.winimage.com/zLibDll
-
-More information can be found at this site.
-
-
-
-
-
-Build instructions for Visual Studio 2008 (32 bits or 64 bits)
---------------------------------------------------------------
-- Decompress current zlib, including all contrib/* files
-- Compile assembly code (with Visual Studio Command Prompt) by running:
-   bld_ml64.bat (in contrib\masmx64)
-   bld_ml32.bat (in contrib\masmx86)
-- Open contrib\vstudio\vc9\zlibvc.sln with Microsoft Visual C++ 2008
-- Or run: vcbuild /rebuild contrib\vstudio\vc9\zlibvc.sln "Release|Win32"
-
-Build instructions for Visual Studio 2010 (32 bits or 64 bits)
---------------------------------------------------------------
-- Decompress current zlib, including all contrib/* files
-- Open contrib\vstudio\vc10\zlibvc.sln with Microsoft Visual C++ 2010
-
-Build instructions for Visual Studio 2012 (32 bits or 64 bits)
---------------------------------------------------------------
-- Decompress current zlib, including all contrib/* files
-- Open contrib\vstudio\vc11\zlibvc.sln with Microsoft Visual C++ 2012
-
-Build instructions for Visual Studio 2013 (32 bits or 64 bits)
---------------------------------------------------------------
-- Decompress current zlib, including all contrib/* files
-- Open contrib\vstudio\vc12\zlibvc.sln with Microsoft Visual C++ 2013
-
-Build instructions for Visual Studio 2015 (32 bits or 64 bits)
---------------------------------------------------------------
-- Decompress current zlib, including all contrib/* files
-- Open contrib\vstudio\vc14\zlibvc.sln with Microsoft Visual C++ 2015
-
-
-Important
----------
-- To use zlibwapi.dll in your application, you must define the
-  macro ZLIB_WINAPI when compiling your application's source files.
-
-
-Additional notes
-----------------
-- This DLL, named zlibwapi.dll, is compatible to the old zlib.dll built
-  by Gilles Vollant from the zlib 1.1.x sources, and distributed at
-    http://www.winimage.com/zLibDll
-  It uses the WINAPI calling convention for the exported functions, and
-  includes the minizip functionality. If your application needs that
-  particular build of zlib.dll, you can rename zlibwapi.dll to zlib.dll.
-
-- The new DLL was renamed because there exist several incompatible
-  versions of zlib.dll on the Internet.
-
-- There is also an official DLL build of zlib, named zlib1.dll. This one
-  is exporting the functions using the CDECL convention. See the file
-  win32\DLL_FAQ.txt found in this zlib distribution.
-
-- There used to be a ZLIB_DLL macro in zlib 1.1.x, but now this symbol
-  has a slightly different effect. To avoid compatibility problems, do
-  not define it here.
-
-
-Gilles Vollant
-info@winimage.com
-
-Visual Studio 2013 and 2015 Projects from Sean Hunt
-seandhunt_7@yahoo.com
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index 1b3624215..000000000
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diff --git a/src/png/zlib/contrib/vstudio/vc10/testzlibdll.vcxproj.filters b/src/png/zlib/contrib/vstudio/vc10/testzlibdll.vcxproj.filters
deleted file mode 100644
index ab87f09f4..000000000
--- a/src/png/zlib/contrib/vstudio/vc10/testzlibdll.vcxproj.filters
+++ /dev/null
@@ -1,22 +0,0 @@
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diff --git a/src/png/zlib/contrib/vstudio/vc10/zlib.rc b/src/png/zlib/contrib/vstudio/vc10/zlib.rc
deleted file mode 100644
index c4e4b016e..000000000
--- a/src/png/zlib/contrib/vstudio/vc10/zlib.rc
+++ /dev/null
@@ -1,32 +0,0 @@
-#include <windows.h>
-
-#define IDR_VERSION1  1
-IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
-  FILEVERSION	 1, 2, 11, 0
-  PRODUCTVERSION 1, 2, 11, 0
-  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
-  FILEFLAGS	0
-  FILEOS	VOS_DOS_WINDOWS32
-  FILETYPE	VFT_DLL
-  FILESUBTYPE	0	// not used
-BEGIN
-  BLOCK "StringFileInfo"
-  BEGIN
-    BLOCK "040904E4"
-    //language ID = U.S. English, char set = Windows, Multilingual
-
-    BEGIN
-      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
-      VALUE "FileVersion",	"1.2.11\0"
-      VALUE "InternalName",	"zlib\0"
-      VALUE "OriginalFilename",	"zlibwapi.dll\0"
-      VALUE "ProductName",	"ZLib.DLL\0"
-      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
-      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
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-  END
-  BLOCK "VarFileInfo"
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diff --git a/src/png/zlib/contrib/vstudio/vc10/zlibstat.vcxproj b/src/png/zlib/contrib/vstudio/vc10/zlibstat.vcxproj
deleted file mode 100644
index 45389a352..000000000
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deleted file mode 100644
index 0c8b2501c..000000000
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diff --git a/src/png/zlib/contrib/vstudio/vc10/zlibvc.def b/src/png/zlib/contrib/vstudio/vc10/zlibvc.def
deleted file mode 100644
index f876c3bca..000000000
--- a/src/png/zlib/contrib/vstudio/vc10/zlibvc.def
+++ /dev/null
@@ -1,153 +0,0 @@
-LIBRARY
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-VERSION		1.2
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-EXPORTS
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-        deflateEnd                               @6
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-        gzclearerr                               @48
-        gzungetc                                 @49
-        zlibCompileFlags                         @50
-        deflatePrime                             @51
-        deflatePending                           @52
-
-        unzOpen                                  @61
-        unzClose                                 @62
-        unzGetGlobalInfo                         @63
-        unzGetCurrentFileInfo                    @64
-        unzGoToFirstFile                         @65
-        unzGoToNextFile                          @66
-        unzOpenCurrentFile                       @67
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-        unzOpenCurrentFile3                      @69
-        unztell                                  @70
-        unzeof                                   @71
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-        unzOpen2                                 @77
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-        unzOpenCurrentFilePassword               @79
-
-        zipOpen                                  @80
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-        zipWriteInFileInZip                      @82
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-        zipOpen2                                 @88
-        zipOpenNewFileInZip3                     @89
-
-        unzGetFilePos                            @100
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-
-        fill_win32_filefunc                      @110
-
-; zlibwapi v1.2.4 added:
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-        fill_win32_filefunc64A                  @112
-        fill_win32_filefunc64W                  @113
-
-        unzOpen64                               @120
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-        unzGetGlobalInfo64                      @122
-        unzGetCurrentFileInfo64                 @124
-        unzGetCurrentFileZStreamPos64           @125
-        unztell64                               @126
-        unzGetFilePos64                         @127
-        unzGoToFilePos64                        @128
-
-        zipOpen64                               @130
-        zipOpen2_64                             @131
-        zipOpenNewFileInZip64                   @132
-        zipOpenNewFileInZip2_64                 @133
-        zipOpenNewFileInZip3_64                 @134
-        zipOpenNewFileInZip4_64                 @135
-        zipCloseFileInZipRaw64                  @136
-
-; zlib1 v1.2.4 added:
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-        crc32_combine                           @142
-        deflateSetHeader                        @144
-        deflateTune                             @145
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diff --git a/src/png/zlib/contrib/vstudio/vc11/zlib.rc b/src/png/zlib/contrib/vstudio/vc11/zlib.rc
deleted file mode 100644
index c4e4b016e..000000000
--- a/src/png/zlib/contrib/vstudio/vc11/zlib.rc
+++ /dev/null
@@ -1,32 +0,0 @@
-#include <windows.h>
-
-#define IDR_VERSION1  1
-IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
-  FILEVERSION	 1, 2, 11, 0
-  PRODUCTVERSION 1, 2, 11, 0
-  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
-  FILEFLAGS	0
-  FILEOS	VOS_DOS_WINDOWS32
-  FILETYPE	VFT_DLL
-  FILESUBTYPE	0	// not used
-BEGIN
-  BLOCK "StringFileInfo"
-  BEGIN
-    BLOCK "040904E4"
-    //language ID = U.S. English, char set = Windows, Multilingual
-
-    BEGIN
-      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
-      VALUE "FileVersion",	"1.2.11\0"
-      VALUE "InternalName",	"zlib\0"
-      VALUE "OriginalFilename",	"zlibwapi.dll\0"
-      VALUE "ProductName",	"ZLib.DLL\0"
-      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
-      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
-    END
-  END
-  BLOCK "VarFileInfo"
-  BEGIN
-    VALUE "Translation", 0x0409, 1252
-  END
-END
diff --git a/src/png/zlib/contrib/vstudio/vc11/zlibstat.vcxproj b/src/png/zlib/contrib/vstudio/vc11/zlibstat.vcxproj
deleted file mode 100644
index 64b4d869d..000000000
--- a/src/png/zlib/contrib/vstudio/vc11/zlibstat.vcxproj
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diff --git a/src/png/zlib/contrib/vstudio/vc11/zlibvc.def b/src/png/zlib/contrib/vstudio/vc11/zlibvc.def
deleted file mode 100644
index f876c3bca..000000000
--- a/src/png/zlib/contrib/vstudio/vc11/zlibvc.def
+++ /dev/null
@@ -1,153 +0,0 @@
-LIBRARY
-; zlib data compression and ZIP file I/O library
-
-VERSION		1.2
-
-EXPORTS
-        adler32                                  @1
-        compress                                 @2
-        crc32                                    @3
-        deflate                                  @4
-        deflateCopy                              @5
-        deflateEnd                               @6
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-        deflateSetDictionary                     @11
-        gzclose                                  @12
-        gzdopen                                  @13
-        gzerror                                  @14
-        gzflush                                  @15
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-        gzread                                   @17
-        gzwrite                                  @18
-        inflate                                  @19
-        inflateEnd                               @20
-        inflateInit2_                            @21
-        inflateInit_                             @22
-        inflateReset                             @23
-        inflateSetDictionary                     @24
-        inflateSync                              @25
-        uncompress                               @26
-        zlibVersion                              @27
-        gzprintf                                 @28
-        gzputc                                   @29
-        gzgetc                                   @30
-        gzseek                                   @31
-        gzrewind                                 @32
-        gztell                                   @33
-        gzeof                                    @34
-        gzsetparams                              @35
-        zError                                   @36
-        inflateSyncPoint                         @37
-        get_crc_table                            @38
-        compress2                                @39
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-        inflateCopy                              @42
-        inflateBackInit_                         @43
-        inflateBack                              @44
-        inflateBackEnd                           @45
-        compressBound                            @46
-        deflateBound                             @47
-        gzclearerr                               @48
-        gzungetc                                 @49
-        zlibCompileFlags                         @50
-        deflatePrime                             @51
-        deflatePending                           @52
-
-        unzOpen                                  @61
-        unzClose                                 @62
-        unzGetGlobalInfo                         @63
-        unzGetCurrentFileInfo                    @64
-        unzGoToFirstFile                         @65
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-        unzOpenCurrentFilePassword               @79
-
-        zipOpen                                  @80
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-        zipCloseFileInZip                        @83
-        zipClose                                 @84
-        zipOpenNewFileInZip2                     @86
-        zipCloseFileInZipRaw                     @87
-        zipOpen2                                 @88
-        zipOpenNewFileInZip3                     @89
-
-        unzGetFilePos                            @100
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-
-        fill_win32_filefunc                      @110
-
-; zlibwapi v1.2.4 added:
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-        fill_win32_filefunc64A                  @112
-        fill_win32_filefunc64W                  @113
-
-        unzOpen64                               @120
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-        unzGetCurrentFileZStreamPos64           @125
-        unztell64                               @126
-        unzGetFilePos64                         @127
-        unzGoToFilePos64                        @128
-
-        zipOpen64                               @130
-        zipOpen2_64                             @131
-        zipOpenNewFileInZip64                   @132
-        zipOpenNewFileInZip2_64                 @133
-        zipOpenNewFileInZip3_64                 @134
-        zipOpenNewFileInZip4_64                 @135
-        zipCloseFileInZipRaw64                  @136
-
-; zlib1 v1.2.4 added:
-        adler32_combine                         @140
-        crc32_combine                           @142
-        deflateSetHeader                        @144
-        deflateTune                             @145
-        gzbuffer                                @146
-        gzclose_r                               @147
-        gzclose_w                               @148
-        gzdirect                                @149
-        gzoffset                                @150
-        inflateGetHeader                        @156
-        inflateMark                             @157
-        inflatePrime                            @158
-        inflateReset2                           @159
-        inflateUndermine                        @160
-
-; zlib1 v1.2.6 added:
-        gzgetc_                                 @161
-        inflateResetKeep                        @163
-        deflateResetKeep                        @164
-
-; zlib1 v1.2.7 added:
-        gzopen_w                                @165
-
-; zlib1 v1.2.8 added:
-        inflateGetDictionary                    @166
-        gzvprintf                               @167
-
-; zlib1 v1.2.9 added:
-        inflateCodesUsed                        @168
-        inflateValidate                         @169
-        uncompress2                             @170
-        gzfread                                 @171
-        gzfwrite                                @172
-        deflateGetDictionary                    @173
-        adler32_z                               @174
-        crc32_z                                 @175
diff --git a/src/png/zlib/contrib/vstudio/vc11/zlibvc.sln b/src/png/zlib/contrib/vstudio/vc11/zlibvc.sln
deleted file mode 100644
index b7e381266..000000000
--- a/src/png/zlib/contrib/vstudio/vc11/zlibvc.sln
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diff --git a/src/png/zlib/contrib/vstudio/vc12/zlib.rc b/src/png/zlib/contrib/vstudio/vc12/zlib.rc
deleted file mode 100644
index c4e4b016e..000000000
--- a/src/png/zlib/contrib/vstudio/vc12/zlib.rc
+++ /dev/null
@@ -1,32 +0,0 @@
-#include <windows.h>
-
-#define IDR_VERSION1  1
-IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
-  FILEVERSION	 1, 2, 11, 0
-  PRODUCTVERSION 1, 2, 11, 0
-  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
-  FILEFLAGS	0
-  FILEOS	VOS_DOS_WINDOWS32
-  FILETYPE	VFT_DLL
-  FILESUBTYPE	0	// not used
-BEGIN
-  BLOCK "StringFileInfo"
-  BEGIN
-    BLOCK "040904E4"
-    //language ID = U.S. English, char set = Windows, Multilingual
-
-    BEGIN
-      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
-      VALUE "FileVersion",	"1.2.11\0"
-      VALUE "InternalName",	"zlib\0"
-      VALUE "OriginalFilename",	"zlibwapi.dll\0"
-      VALUE "ProductName",	"ZLib.DLL\0"
-      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
-      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
-    END
-  END
-  BLOCK "VarFileInfo"
-  BEGIN
-    VALUE "Translation", 0x0409, 1252
-  END
-END
diff --git a/src/png/zlib/contrib/vstudio/vc12/zlibstat.vcxproj b/src/png/zlib/contrib/vstudio/vc12/zlibstat.vcxproj
deleted file mode 100644
index 3fdee7c50..000000000
--- a/src/png/zlib/contrib/vstudio/vc12/zlibstat.vcxproj
+++ /dev/null
@@ -1,467 +0,0 @@
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diff --git a/src/png/zlib/contrib/vstudio/vc12/zlibvc.def b/src/png/zlib/contrib/vstudio/vc12/zlibvc.def
deleted file mode 100644
index f876c3bca..000000000
--- a/src/png/zlib/contrib/vstudio/vc12/zlibvc.def
+++ /dev/null
@@ -1,153 +0,0 @@
-LIBRARY
-; zlib data compression and ZIP file I/O library
-
-VERSION		1.2
-
-EXPORTS
-        adler32                                  @1
-        compress                                 @2
-        crc32                                    @3
-        deflate                                  @4
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-        deflateEnd                               @6
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-        deflateInit_                             @8
-        deflateParams                            @9
-        deflateReset                             @10
-        deflateSetDictionary                     @11
-        gzclose                                  @12
-        gzdopen                                  @13
-        gzerror                                  @14
-        gzflush                                  @15
-        gzopen                                   @16
-        gzread                                   @17
-        gzwrite                                  @18
-        inflate                                  @19
-        inflateEnd                               @20
-        inflateInit2_                            @21
-        inflateInit_                             @22
-        inflateReset                             @23
-        inflateSetDictionary                     @24
-        inflateSync                              @25
-        uncompress                               @26
-        zlibVersion                              @27
-        gzprintf                                 @28
-        gzputc                                   @29
-        gzgetc                                   @30
-        gzseek                                   @31
-        gzrewind                                 @32
-        gztell                                   @33
-        gzeof                                    @34
-        gzsetparams                              @35
-        zError                                   @36
-        inflateSyncPoint                         @37
-        get_crc_table                            @38
-        compress2                                @39
-        gzputs                                   @40
-        gzgets                                   @41
-        inflateCopy                              @42
-        inflateBackInit_                         @43
-        inflateBack                              @44
-        inflateBackEnd                           @45
-        compressBound                            @46
-        deflateBound                             @47
-        gzclearerr                               @48
-        gzungetc                                 @49
-        zlibCompileFlags                         @50
-        deflatePrime                             @51
-        deflatePending                           @52
-
-        unzOpen                                  @61
-        unzClose                                 @62
-        unzGetGlobalInfo                         @63
-        unzGetCurrentFileInfo                    @64
-        unzGoToFirstFile                         @65
-        unzGoToNextFile                          @66
-        unzOpenCurrentFile                       @67
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-        unzOpenCurrentFile3                      @69
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-        unzeof                                   @71
-        unzCloseCurrentFile                      @72
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-        unzOpen2                                 @77
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-        unzOpenCurrentFilePassword               @79
-
-        zipOpen                                  @80
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-        zipWriteInFileInZip                      @82
-        zipCloseFileInZip                        @83
-        zipClose                                 @84
-        zipOpenNewFileInZip2                     @86
-        zipCloseFileInZipRaw                     @87
-        zipOpen2                                 @88
-        zipOpenNewFileInZip3                     @89
-
-        unzGetFilePos                            @100
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-
-        fill_win32_filefunc                      @110
-
-; zlibwapi v1.2.4 added:
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-        fill_win32_filefunc64A                  @112
-        fill_win32_filefunc64W                  @113
-
-        unzOpen64                               @120
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-        unzGetGlobalInfo64                      @122
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-        unzGetCurrentFileZStreamPos64           @125
-        unztell64                               @126
-        unzGetFilePos64                         @127
-        unzGoToFilePos64                        @128
-
-        zipOpen64                               @130
-        zipOpen2_64                             @131
-        zipOpenNewFileInZip64                   @132
-        zipOpenNewFileInZip2_64                 @133
-        zipOpenNewFileInZip3_64                 @134
-        zipOpenNewFileInZip4_64                 @135
-        zipCloseFileInZipRaw64                  @136
-
-; zlib1 v1.2.4 added:
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-        crc32_combine                           @142
-        deflateSetHeader                        @144
-        deflateTune                             @145
-        gzbuffer                                @146
-        gzclose_r                               @147
-        gzclose_w                               @148
-        gzdirect                                @149
-        gzoffset                                @150
-        inflateGetHeader                        @156
-        inflateMark                             @157
-        inflatePrime                            @158
-        inflateReset2                           @159
-        inflateUndermine                        @160
-
-; zlib1 v1.2.6 added:
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-        inflateResetKeep                        @163
-        deflateResetKeep                        @164
-
-; zlib1 v1.2.7 added:
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-
-; zlib1 v1.2.8 added:
-        inflateGetDictionary                    @166
-        gzvprintf                               @167
-
-; zlib1 v1.2.9 added:
-        inflateCodesUsed                        @168
-        inflateValidate                         @169
-        uncompress2                             @170
-        gzfread                                 @171
-        gzfwrite                                @172
-        deflateGetDictionary                    @173
-        adler32_z                               @174
-        crc32_z                                 @175
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deleted file mode 100644
index dcda22984..000000000
--- a/src/png/zlib/contrib/vstudio/vc12/zlibvc.sln
+++ /dev/null
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diff --git a/src/png/zlib/contrib/vstudio/vc14/testzlibdll.vcxproj b/src/png/zlib/contrib/vstudio/vc14/testzlibdll.vcxproj
deleted file mode 100644
index d87474dec..000000000
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+++ /dev/null
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diff --git a/src/png/zlib/contrib/vstudio/vc14/zlib.rc b/src/png/zlib/contrib/vstudio/vc14/zlib.rc
deleted file mode 100644
index c4e4b016e..000000000
--- a/src/png/zlib/contrib/vstudio/vc14/zlib.rc
+++ /dev/null
@@ -1,32 +0,0 @@
-#include <windows.h>
-
-#define IDR_VERSION1  1
-IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
-  FILEVERSION	 1, 2, 11, 0
-  PRODUCTVERSION 1, 2, 11, 0
-  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
-  FILEFLAGS	0
-  FILEOS	VOS_DOS_WINDOWS32
-  FILETYPE	VFT_DLL
-  FILESUBTYPE	0	// not used
-BEGIN
-  BLOCK "StringFileInfo"
-  BEGIN
-    BLOCK "040904E4"
-    //language ID = U.S. English, char set = Windows, Multilingual
-
-    BEGIN
-      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
-      VALUE "FileVersion",	"1.2.11\0"
-      VALUE "InternalName",	"zlib\0"
-      VALUE "OriginalFilename",	"zlibwapi.dll\0"
-      VALUE "ProductName",	"ZLib.DLL\0"
-      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
-      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
-    END
-  END
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diff --git a/src/png/zlib/contrib/vstudio/vc14/zlibvc.def b/src/png/zlib/contrib/vstudio/vc14/zlibvc.def
deleted file mode 100644
index f876c3bca..000000000
--- a/src/png/zlib/contrib/vstudio/vc14/zlibvc.def
+++ /dev/null
@@ -1,153 +0,0 @@
-LIBRARY
-; zlib data compression and ZIP file I/O library
-
-VERSION		1.2
-
-EXPORTS
-        adler32                                  @1
-        compress                                 @2
-        crc32                                    @3
-        deflate                                  @4
-        deflateCopy                              @5
-        deflateEnd                               @6
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-        deflateInit_                             @8
-        deflateParams                            @9
-        deflateReset                             @10
-        deflateSetDictionary                     @11
-        gzclose                                  @12
-        gzdopen                                  @13
-        gzerror                                  @14
-        gzflush                                  @15
-        gzopen                                   @16
-        gzread                                   @17
-        gzwrite                                  @18
-        inflate                                  @19
-        inflateEnd                               @20
-        inflateInit2_                            @21
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-        inflateReset                             @23
-        inflateSetDictionary                     @24
-        inflateSync                              @25
-        uncompress                               @26
-        zlibVersion                              @27
-        gzprintf                                 @28
-        gzputc                                   @29
-        gzgetc                                   @30
-        gzseek                                   @31
-        gzrewind                                 @32
-        gztell                                   @33
-        gzeof                                    @34
-        gzsetparams                              @35
-        zError                                   @36
-        inflateSyncPoint                         @37
-        get_crc_table                            @38
-        compress2                                @39
-        gzputs                                   @40
-        gzgets                                   @41
-        inflateCopy                              @42
-        inflateBackInit_                         @43
-        inflateBack                              @44
-        inflateBackEnd                           @45
-        compressBound                            @46
-        deflateBound                             @47
-        gzclearerr                               @48
-        gzungetc                                 @49
-        zlibCompileFlags                         @50
-        deflatePrime                             @51
-        deflatePending                           @52
-
-        unzOpen                                  @61
-        unzClose                                 @62
-        unzGetGlobalInfo                         @63
-        unzGetCurrentFileInfo                    @64
-        unzGoToFirstFile                         @65
-        unzGoToNextFile                          @66
-        unzOpenCurrentFile                       @67
-        unzReadCurrentFile                       @68
-        unzOpenCurrentFile3                      @69
-        unztell                                  @70
-        unzeof                                   @71
-        unzCloseCurrentFile                      @72
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-        unzLocateFile                            @75
-        unzGetLocalExtrafield                    @76
-        unzOpen2                                 @77
-        unzOpenCurrentFile2                      @78
-        unzOpenCurrentFilePassword               @79
-
-        zipOpen                                  @80
-        zipOpenNewFileInZip                      @81
-        zipWriteInFileInZip                      @82
-        zipCloseFileInZip                        @83
-        zipClose                                 @84
-        zipOpenNewFileInZip2                     @86
-        zipCloseFileInZipRaw                     @87
-        zipOpen2                                 @88
-        zipOpenNewFileInZip3                     @89
-
-        unzGetFilePos                            @100
-        unzGoToFilePos                           @101
-
-        fill_win32_filefunc                      @110
-
-; zlibwapi v1.2.4 added:
-        fill_win32_filefunc64                   @111
-        fill_win32_filefunc64A                  @112
-        fill_win32_filefunc64W                  @113
-
-        unzOpen64                               @120
-        unzOpen2_64                             @121
-        unzGetGlobalInfo64                      @122
-        unzGetCurrentFileInfo64                 @124
-        unzGetCurrentFileZStreamPos64           @125
-        unztell64                               @126
-        unzGetFilePos64                         @127
-        unzGoToFilePos64                        @128
-
-        zipOpen64                               @130
-        zipOpen2_64                             @131
-        zipOpenNewFileInZip64                   @132
-        zipOpenNewFileInZip2_64                 @133
-        zipOpenNewFileInZip3_64                 @134
-        zipOpenNewFileInZip4_64                 @135
-        zipCloseFileInZipRaw64                  @136
-
-; zlib1 v1.2.4 added:
-        adler32_combine                         @140
-        crc32_combine                           @142
-        deflateSetHeader                        @144
-        deflateTune                             @145
-        gzbuffer                                @146
-        gzclose_r                               @147
-        gzclose_w                               @148
-        gzdirect                                @149
-        gzoffset                                @150
-        inflateGetHeader                        @156
-        inflateMark                             @157
-        inflatePrime                            @158
-        inflateReset2                           @159
-        inflateUndermine                        @160
-
-; zlib1 v1.2.6 added:
-        gzgetc_                                 @161
-        inflateResetKeep                        @163
-        deflateResetKeep                        @164
-
-; zlib1 v1.2.7 added:
-        gzopen_w                                @165
-
-; zlib1 v1.2.8 added:
-        inflateGetDictionary                    @166
-        gzvprintf                               @167
-
-; zlib1 v1.2.9 added:
-        inflateCodesUsed                        @168
-        inflateValidate                         @169
-        uncompress2                             @170
-        gzfread                                 @171
-        gzfwrite                                @172
-        deflateGetDictionary                    @173
-        adler32_z                               @174
-        crc32_z                                 @175
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diff --git a/src/png/zlib/contrib/vstudio/vc14/zlibvc.vcxproj b/src/png/zlib/contrib/vstudio/vc14/zlibvc.vcxproj
deleted file mode 100644
index f8f673cb0..000000000
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diff --git a/src/png/zlib/contrib/vstudio/vc9/miniunz.vcproj b/src/png/zlib/contrib/vstudio/vc9/miniunz.vcproj
deleted file mode 100644
index 038a9e5fa..000000000
--- a/src/png/zlib/contrib/vstudio/vc9/miniunz.vcproj
+++ /dev/null
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-				StringPooling="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="2"
-				BufferSecurityCheck="false"
-				EnableFunctionLevelLinking="true"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="x64\ZlibDllRelease\zlibwapi.lib"
-				OutputFile="$(OutDir)/miniunz.exe"
-				LinkIncremental="1"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				SubSystem="1"
-				OptimizeReferences="2"
-				EnableCOMDATFolding="2"
-				OptimizeForWindows98="1"
-				TargetMachine="17"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCWebDeploymentTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Release|Itanium"
-			OutputDirectory="ia64\MiniUnzip$(ConfigurationName)"
-			IntermediateDirectory="ia64\MiniUnzip$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-				TargetEnvironment="2"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="2"
-				InlineFunctionExpansion="1"
-				OmitFramePointers="true"
-				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
-				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE;WIN64"
-				StringPooling="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="2"
-				BufferSecurityCheck="false"
-				EnableFunctionLevelLinking="true"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="ia64\ZlibDllRelease\zlibwapi.lib"
-				OutputFile="$(OutDir)/miniunz.exe"
-				LinkIncremental="1"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				SubSystem="1"
-				OptimizeReferences="2"
-				EnableCOMDATFolding="2"
-				OptimizeForWindows98="1"
-				TargetMachine="5"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCWebDeploymentTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-	</Configurations>
-	<References>
-	</References>
-	<Files>
-		<Filter
-			Name="Source Files"
-			Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm"
-			>
-			<File
-				RelativePath="..\..\minizip\miniunz.c"
-				>
-			</File>
-		</Filter>
-		<Filter
-			Name="Header Files"
-			Filter="h;hpp;hxx;hm;inl;inc"
-			>
-		</Filter>
-		<Filter
-			Name="Resource Files"
-			Filter="rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
-			>
-		</Filter>
-	</Files>
-	<Globals>
-	</Globals>
-</VisualStudioProject>
diff --git a/src/png/zlib/contrib/vstudio/vc9/minizip.vcproj b/src/png/zlib/contrib/vstudio/vc9/minizip.vcproj
deleted file mode 100644
index ad4023991..000000000
--- a/src/png/zlib/contrib/vstudio/vc9/minizip.vcproj
+++ /dev/null
@@ -1,562 +0,0 @@
-<?xml version="1.0" encoding="Windows-1252"?>
-<VisualStudioProject
-	ProjectType="Visual C++"
-	Version="9.00"
-	Name="minizip"
-	ProjectGUID="{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}"
-	Keyword="Win32Proj"
-	TargetFrameworkVersion="131072"
-	>
-	<Platforms>
-		<Platform
-			Name="Win32"
-		/>
-		<Platform
-			Name="x64"
-		/>
-		<Platform
-			Name="Itanium"
-		/>
-	</Platforms>
-	<ToolFiles>
-	</ToolFiles>
-	<Configurations>
-		<Configuration
-			Name="Debug|Win32"
-			OutputDirectory="x86\MiniZip$(ConfigurationName)"
-			IntermediateDirectory="x86\MiniZip$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="0"
-				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
-				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE"
-				MinimalRebuild="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="1"
-				BufferSecurityCheck="false"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="4"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="x86\ZlibDllDebug\zlibwapi.lib"
-				OutputFile="$(OutDir)/minizip.exe"
-				LinkIncremental="2"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				ProgramDatabaseFile="$(OutDir)/minizip.pdb"
-				SubSystem="1"
-				RandomizedBaseAddress="1"
-				DataExecutionPrevention="0"
-				TargetMachine="1"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Release|Win32"
-			OutputDirectory="x86\MiniZip$(ConfigurationName)"
-			IntermediateDirectory="x86\MiniZip$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="2"
-				InlineFunctionExpansion="1"
-				OmitFramePointers="true"
-				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
-				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE"
-				StringPooling="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="0"
-				BufferSecurityCheck="false"
-				EnableFunctionLevelLinking="true"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="x86\ZlibDllRelease\zlibwapi.lib"
-				OutputFile="$(OutDir)/minizip.exe"
-				LinkIncremental="1"
-				GenerateDebugInformation="true"
-				SubSystem="1"
-				OptimizeReferences="2"
-				EnableCOMDATFolding="2"
-				OptimizeForWindows98="1"
-				RandomizedBaseAddress="1"
-				DataExecutionPrevention="0"
-				TargetMachine="1"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Debug|x64"
-			OutputDirectory="x64\$(ConfigurationName)"
-			IntermediateDirectory="x64\$(ConfigurationName)"
-			ConfigurationType="1"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-				TargetEnvironment="3"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="0"
-				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
-				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE;WIN64"
-				MinimalRebuild="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="3"
-				BufferSecurityCheck="false"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="x64\ZlibDllDebug\zlibwapi.lib"
-				OutputFile="$(OutDir)/minizip.exe"
-				LinkIncremental="2"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				ProgramDatabaseFile="$(OutDir)/minizip.pdb"
-				SubSystem="1"
-				TargetMachine="17"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCWebDeploymentTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Debug|Itanium"
-			OutputDirectory="ia64\$(ConfigurationName)"
-			IntermediateDirectory="ia64\$(ConfigurationName)"
-			ConfigurationType="1"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-				TargetEnvironment="2"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="0"
-				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
-				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE;WIN64"
-				MinimalRebuild="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="3"
-				BufferSecurityCheck="false"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="ia64\ZlibDllDebug\zlibwapi.lib"
-				OutputFile="$(OutDir)/minizip.exe"
-				LinkIncremental="2"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				ProgramDatabaseFile="$(OutDir)/minizip.pdb"
-				SubSystem="1"
-				TargetMachine="5"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCWebDeploymentTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Release|x64"
-			OutputDirectory="x64\$(ConfigurationName)"
-			IntermediateDirectory="x64\$(ConfigurationName)"
-			ConfigurationType="1"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-				TargetEnvironment="3"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="2"
-				InlineFunctionExpansion="1"
-				OmitFramePointers="true"
-				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
-				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE;WIN64"
-				StringPooling="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="2"
-				BufferSecurityCheck="false"
-				EnableFunctionLevelLinking="true"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="x64\ZlibDllRelease\zlibwapi.lib"
-				OutputFile="$(OutDir)/minizip.exe"
-				LinkIncremental="1"
-				GenerateDebugInformation="true"
-				SubSystem="1"
-				OptimizeReferences="2"
-				EnableCOMDATFolding="2"
-				OptimizeForWindows98="1"
-				TargetMachine="17"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCWebDeploymentTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Release|Itanium"
-			OutputDirectory="ia64\$(ConfigurationName)"
-			IntermediateDirectory="ia64\$(ConfigurationName)"
-			ConfigurationType="1"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-				TargetEnvironment="2"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="2"
-				InlineFunctionExpansion="1"
-				OmitFramePointers="true"
-				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
-				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE;WIN64"
-				StringPooling="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="2"
-				BufferSecurityCheck="false"
-				EnableFunctionLevelLinking="true"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="ia64\ZlibDllRelease\zlibwapi.lib"
-				OutputFile="$(OutDir)/minizip.exe"
-				LinkIncremental="1"
-				GenerateDebugInformation="true"
-				SubSystem="1"
-				OptimizeReferences="2"
-				EnableCOMDATFolding="2"
-				OptimizeForWindows98="1"
-				TargetMachine="5"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCWebDeploymentTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-	</Configurations>
-	<References>
-	</References>
-	<Files>
-		<Filter
-			Name="Source Files"
-			Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm"
-			>
-			<File
-				RelativePath="..\..\minizip\minizip.c"
-				>
-			</File>
-		</Filter>
-		<Filter
-			Name="Header Files"
-			Filter="h;hpp;hxx;hm;inl;inc"
-			>
-		</Filter>
-		<Filter
-			Name="Resource Files"
-			Filter="rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
-			>
-		</Filter>
-	</Files>
-	<Globals>
-	</Globals>
-</VisualStudioProject>
diff --git a/src/png/zlib/contrib/vstudio/vc9/testzlib.vcproj b/src/png/zlib/contrib/vstudio/vc9/testzlib.vcproj
deleted file mode 100644
index c9f19d24e..000000000
--- a/src/png/zlib/contrib/vstudio/vc9/testzlib.vcproj
+++ /dev/null
@@ -1,852 +0,0 @@
-<?xml version="1.0" encoding="Windows-1252"?>
-<VisualStudioProject
-	ProjectType="Visual C++"
-	Version="9,00"
-	Name="testzlib"
-	ProjectGUID="{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}"
-	RootNamespace="testzlib"
-	Keyword="Win32Proj"
-	TargetFrameworkVersion="131072"
-	>
-	<Platforms>
-		<Platform
-			Name="Win32"
-		/>
-		<Platform
-			Name="x64"
-		/>
-		<Platform
-			Name="Itanium"
-		/>
-	</Platforms>
-	<ToolFiles>
-	</ToolFiles>
-	<Configurations>
-		<Configuration
-			Name="Debug|Win32"
-			OutputDirectory="x86\TestZlib$(ConfigurationName)"
-			IntermediateDirectory="x86\TestZlib$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="0"
-				AdditionalIncludeDirectories="..\..\.."
-				PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
-				MinimalRebuild="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="1"
-				BufferSecurityCheck="false"
-				UsePrecompiledHeader="0"
-				AssemblerOutput="4"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="4"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="..\..\masmx86\match686.obj ..\..\masmx86\inffas32.obj"
-				OutputFile="$(OutDir)/testzlib.exe"
-				LinkIncremental="2"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				ProgramDatabaseFile="$(OutDir)/testzlib.pdb"
-				SubSystem="1"
-				RandomizedBaseAddress="1"
-				DataExecutionPrevention="0"
-				TargetMachine="1"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Debug|x64"
-			OutputDirectory="x64\TestZlib$(ConfigurationName)"
-			IntermediateDirectory="x64\TestZlib$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				AdditionalIncludeDirectories="..\..\.."
-				PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="3"
-				BufferSecurityCheck="false"
-				AssemblerListingLocation="$(IntDir)\"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="..\..\masmx64\gvmat64.obj ..\..\masmx64\inffasx64.obj"
-				GenerateManifest="false"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Debug|Itanium"
-			OutputDirectory="ia64\TestZlib$(ConfigurationName)"
-			IntermediateDirectory="ia64\TestZlib$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-				TargetEnvironment="2"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="0"
-				AdditionalIncludeDirectories="..\..\.."
-				PreprocessorDefinitions="ZLIB_WINAPI;_DEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
-				MinimalRebuild="true"
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-				AssemblerOutput="4"
-				AssemblerListingLocation="$(IntDir)\"
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-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				OutputFile="$(OutDir)/testzlib.exe"
-				LinkIncremental="2"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				ProgramDatabaseFile="$(OutDir)/testzlib.pdb"
-				SubSystem="1"
-				TargetMachine="5"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
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-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="ReleaseWithoutAsm|Win32"
-			OutputDirectory="x86\TestZlib$(ConfigurationName)"
-			IntermediateDirectory="x86\TestZlib$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			CharacterSet="2"
-			WholeProgramOptimization="1"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="2"
-				InlineFunctionExpansion="1"
-				OmitFramePointers="true"
-				AdditionalIncludeDirectories="..\..\.."
-				PreprocessorDefinitions="WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
-				StringPooling="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="0"
-				BufferSecurityCheck="false"
-				EnableFunctionLevelLinking="true"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				OutputFile="$(OutDir)/testzlib.exe"
-				LinkIncremental="1"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				SubSystem="1"
-				OptimizeReferences="2"
-				EnableCOMDATFolding="2"
-				OptimizeForWindows98="1"
-				RandomizedBaseAddress="1"
-				DataExecutionPrevention="0"
-				TargetMachine="1"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="ReleaseWithoutAsm|x64"
-			OutputDirectory="x64\TestZlib$(ConfigurationName)"
-			IntermediateDirectory="x64\TestZlib$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			WholeProgramOptimization="1"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				AdditionalIncludeDirectories="..\..\.."
-				PreprocessorDefinitions="WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="2"
-				BufferSecurityCheck="false"
-				AssemblerListingLocation="$(IntDir)\"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies=""
-				GenerateManifest="false"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="ReleaseWithoutAsm|Itanium"
-			OutputDirectory="ia64\TestZlib$(ConfigurationName)"
-			IntermediateDirectory="ia64\TestZlib$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			CharacterSet="2"
-			WholeProgramOptimization="1"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-				TargetEnvironment="2"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="2"
-				InlineFunctionExpansion="1"
-				OmitFramePointers="true"
-				AdditionalIncludeDirectories="..\..\.."
-				PreprocessorDefinitions="ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64"
-				StringPooling="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="2"
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-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				OutputFile="$(OutDir)/testzlib.exe"
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-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				SubSystem="1"
-				OptimizeReferences="2"
-				EnableCOMDATFolding="2"
-				OptimizeForWindows98="1"
-				TargetMachine="5"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Release|Win32"
-			OutputDirectory="x86\TestZlib$(ConfigurationName)"
-			IntermediateDirectory="x86\TestZlib$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			CharacterSet="2"
-			WholeProgramOptimization="1"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-			/>
-			<Tool
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-				InlineFunctionExpansion="1"
-				OmitFramePointers="true"
-				AdditionalIncludeDirectories="..\..\.."
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-				StringPooling="true"
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-				AssemblerListingLocation="$(IntDir)\"
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-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="..\..\masmx86\match686.obj ..\..\masmx86\inffas32.obj"
-				OutputFile="$(OutDir)/testzlib.exe"
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-				GenerateManifest="false"
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-				SubSystem="1"
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-				DataExecutionPrevention="0"
-				TargetMachine="1"
-			/>
-			<Tool
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-			<Tool
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-			<Tool
-				Name="VCXDCMakeTool"
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-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
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-			OutputDirectory="x64\TestZlib$(ConfigurationName)"
-			IntermediateDirectory="x64\TestZlib$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			WholeProgramOptimization="1"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-			/>
-			<Tool
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-				PreprocessorDefinitions="ASMV;ASMINF;WIN32;ZLIB_WINAPI;NDEBUG;_CONSOLE;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
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-			<Tool
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-			<Tool
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-		</Configuration>
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-			OutputDirectory="ia64\TestZlib$(ConfigurationName)"
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-			WholeProgramOptimization="1"
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-			<Tool
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-		</Configuration>
-	</Configurations>
-	<References>
-	</References>
-	<Files>
-		<Filter
-			Name="Source Files"
-			Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm"
-			>
-			<File
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-			<File
-				RelativePath="..\..\..\crc32.c"
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-				</FileConfiguration>
-				<FileConfiguration
-					Name="ReleaseWithoutAsm|Itanium"
-					ExcludedFromBuild="true"
-					>
-					<Tool
-						Name="VCCLCompilerTool"
-					/>
-				</FileConfiguration>
-				<FileConfiguration
-					Name="Release|Win32"
-					ExcludedFromBuild="true"
-					>
-					<Tool
-						Name="VCCLCompilerTool"
-					/>
-				</FileConfiguration>
-				<FileConfiguration
-					Name="Release|Itanium"
-					ExcludedFromBuild="true"
-					>
-					<Tool
-						Name="VCCLCompilerTool"
-					/>
-				</FileConfiguration>
-			</File>
-			<File
-				RelativePath="..\..\..\inffast.c"
-				>
-			</File>
-			<File
-				RelativePath="..\..\..\inflate.c"
-				>
-			</File>
-			<File
-				RelativePath="..\..\..\inftrees.c"
-				>
-			</File>
-			<File
-				RelativePath="..\..\testzlib\testzlib.c"
-				>
-			</File>
-			<File
-				RelativePath="..\..\..\trees.c"
-				>
-			</File>
-			<File
-				RelativePath="..\..\..\uncompr.c"
-				>
-			</File>
-			<File
-				RelativePath="..\..\..\zutil.c"
-				>
-			</File>
-		</Filter>
-		<Filter
-			Name="Header Files"
-			Filter="h;hpp;hxx;hm;inl;inc"
-			>
-		</Filter>
-		<Filter
-			Name="Resource Files"
-			Filter="rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
-			>
-		</Filter>
-	</Files>
-	<Globals>
-	</Globals>
-</VisualStudioProject>
diff --git a/src/png/zlib/contrib/vstudio/vc9/testzlibdll.vcproj b/src/png/zlib/contrib/vstudio/vc9/testzlibdll.vcproj
deleted file mode 100644
index d7530fd7d..000000000
--- a/src/png/zlib/contrib/vstudio/vc9/testzlibdll.vcproj
+++ /dev/null
@@ -1,565 +0,0 @@
-<?xml version="1.0" encoding="Windows-1252"?>
-<VisualStudioProject
-	ProjectType="Visual C++"
-	Version="9.00"
-	Name="TestZlibDll"
-	ProjectGUID="{C52F9E7B-498A-42BE-8DB4-85A15694366A}"
-	Keyword="Win32Proj"
-	TargetFrameworkVersion="131072"
-	>
-	<Platforms>
-		<Platform
-			Name="Win32"
-		/>
-		<Platform
-			Name="x64"
-		/>
-		<Platform
-			Name="Itanium"
-		/>
-	</Platforms>
-	<ToolFiles>
-	</ToolFiles>
-	<Configurations>
-		<Configuration
-			Name="Debug|Win32"
-			OutputDirectory="x86\TestZlibDll$(ConfigurationName)"
-			IntermediateDirectory="x86\TestZlibDll$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="0"
-				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
-				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE"
-				MinimalRebuild="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="1"
-				BufferSecurityCheck="false"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="4"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="x86\ZlibDllDebug\zlibwapi.lib"
-				OutputFile="$(OutDir)/testzlib.exe"
-				LinkIncremental="2"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				ProgramDatabaseFile="$(OutDir)/testzlib.pdb"
-				SubSystem="1"
-				RandomizedBaseAddress="1"
-				DataExecutionPrevention="0"
-				TargetMachine="1"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Release|Win32"
-			OutputDirectory="x86\TestZlibDll$(ConfigurationName)"
-			IntermediateDirectory="x86\TestZlibDll$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="2"
-				InlineFunctionExpansion="1"
-				OmitFramePointers="true"
-				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
-				PreprocessorDefinitions="WIN32;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE"
-				StringPooling="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="0"
-				BufferSecurityCheck="false"
-				EnableFunctionLevelLinking="true"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="x86\ZlibDllRelease\zlibwapi.lib"
-				OutputFile="$(OutDir)/testzlib.exe"
-				LinkIncremental="1"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				SubSystem="1"
-				OptimizeReferences="2"
-				EnableCOMDATFolding="2"
-				OptimizeForWindows98="1"
-				RandomizedBaseAddress="1"
-				DataExecutionPrevention="0"
-				TargetMachine="1"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Debug|x64"
-			OutputDirectory="x64\TestZlibDll$(ConfigurationName)"
-			IntermediateDirectory="x64\TestZlibDll$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-				TargetEnvironment="3"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="0"
-				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
-				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE;WIN64"
-				MinimalRebuild="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="3"
-				BufferSecurityCheck="false"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="x64\ZlibDllDebug\zlibwapi.lib"
-				OutputFile="$(OutDir)/testzlib.exe"
-				LinkIncremental="2"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				ProgramDatabaseFile="$(OutDir)/testzlib.pdb"
-				SubSystem="1"
-				TargetMachine="17"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCWebDeploymentTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Debug|Itanium"
-			OutputDirectory="ia64\TestZlibDll$(ConfigurationName)"
-			IntermediateDirectory="ia64\TestZlibDll$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-				TargetEnvironment="2"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="0"
-				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
-				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;_DEBUG;_CONSOLE;WIN64"
-				MinimalRebuild="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="3"
-				BufferSecurityCheck="false"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="ia64\ZlibDllDebug\zlibwapi.lib"
-				OutputFile="$(OutDir)/testzlib.exe"
-				LinkIncremental="2"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				ProgramDatabaseFile="$(OutDir)/testzlib.pdb"
-				SubSystem="1"
-				TargetMachine="5"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCWebDeploymentTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Release|x64"
-			OutputDirectory="x64\TestZlibDll$(ConfigurationName)"
-			IntermediateDirectory="x64\TestZlibDll$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-				TargetEnvironment="3"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="2"
-				InlineFunctionExpansion="1"
-				OmitFramePointers="true"
-				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
-				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE;WIN64"
-				StringPooling="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="2"
-				BufferSecurityCheck="false"
-				EnableFunctionLevelLinking="true"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="x64\ZlibDllRelease\zlibwapi.lib"
-				OutputFile="$(OutDir)/testzlib.exe"
-				LinkIncremental="1"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				SubSystem="1"
-				OptimizeReferences="2"
-				EnableCOMDATFolding="2"
-				OptimizeForWindows98="1"
-				TargetMachine="17"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCWebDeploymentTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Release|Itanium"
-			OutputDirectory="ia64\TestZlibDll$(ConfigurationName)"
-			IntermediateDirectory="ia64\TestZlibDll$(ConfigurationName)\Tmp"
-			ConfigurationType="1"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-				TargetEnvironment="2"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="2"
-				InlineFunctionExpansion="1"
-				OmitFramePointers="true"
-				AdditionalIncludeDirectories="..\..\..;..\..\minizip"
-				PreprocessorDefinitions="_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;ZLIB_WINAPI;NDEBUG;_CONSOLE;WIN64"
-				StringPooling="true"
-				BasicRuntimeChecks="0"
-				RuntimeLibrary="2"
-				BufferSecurityCheck="false"
-				EnableFunctionLevelLinking="true"
-				UsePrecompiledHeader="0"
-				AssemblerListingLocation="$(IntDir)\"
-				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
-				DebugInformationFormat="3"
-			/>
-			<Tool
-				Name="VCManagedResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-			/>
-			<Tool
-				Name="VCPreLinkEventTool"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="ia64\ZlibDllRelease\zlibwapi.lib"
-				OutputFile="$(OutDir)/testzlib.exe"
-				LinkIncremental="1"
-				GenerateManifest="false"
-				GenerateDebugInformation="true"
-				SubSystem="1"
-				OptimizeReferences="2"
-				EnableCOMDATFolding="2"
-				OptimizeForWindows98="1"
-				TargetMachine="5"
-			/>
-			<Tool
-				Name="VCALinkTool"
-			/>
-			<Tool
-				Name="VCManifestTool"
-			/>
-			<Tool
-				Name="VCXDCMakeTool"
-			/>
-			<Tool
-				Name="VCBscMakeTool"
-			/>
-			<Tool
-				Name="VCFxCopTool"
-			/>
-			<Tool
-				Name="VCAppVerifierTool"
-			/>
-			<Tool
-				Name="VCWebDeploymentTool"
-			/>
-			<Tool
-				Name="VCPostBuildEventTool"
-			/>
-		</Configuration>
-	</Configurations>
-	<References>
-	</References>
-	<Files>
-		<Filter
-			Name="Source Files"
-			Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm"
-			>
-			<File
-				RelativePath="..\..\testzlib\testzlib.c"
-				>
-			</File>
-		</Filter>
-		<Filter
-			Name="Header Files"
-			Filter="h;hpp;hxx;hm;inl;inc"
-			>
-		</Filter>
-		<Filter
-			Name="Resource Files"
-			Filter="rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
-			>
-		</Filter>
-	</Files>
-	<Globals>
-	</Globals>
-</VisualStudioProject>
diff --git a/src/png/zlib/contrib/vstudio/vc9/zlib.rc b/src/png/zlib/contrib/vstudio/vc9/zlib.rc
deleted file mode 100644
index c4e4b016e..000000000
--- a/src/png/zlib/contrib/vstudio/vc9/zlib.rc
+++ /dev/null
@@ -1,32 +0,0 @@
-#include <windows.h>
-
-#define IDR_VERSION1  1
-IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
-  FILEVERSION	 1, 2, 11, 0
-  PRODUCTVERSION 1, 2, 11, 0
-  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
-  FILEFLAGS	0
-  FILEOS	VOS_DOS_WINDOWS32
-  FILETYPE	VFT_DLL
-  FILESUBTYPE	0	// not used
-BEGIN
-  BLOCK "StringFileInfo"
-  BEGIN
-    BLOCK "040904E4"
-    //language ID = U.S. English, char set = Windows, Multilingual
-
-    BEGIN
-      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
-      VALUE "FileVersion",	"1.2.11\0"
-      VALUE "InternalName",	"zlib\0"
-      VALUE "OriginalFilename",	"zlibwapi.dll\0"
-      VALUE "ProductName",	"ZLib.DLL\0"
-      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
-      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
-    END
-  END
-  BLOCK "VarFileInfo"
-  BEGIN
-    VALUE "Translation", 0x0409, 1252
-  END
-END
diff --git a/src/png/zlib/contrib/vstudio/vc9/zlibstat.vcproj b/src/png/zlib/contrib/vstudio/vc9/zlibstat.vcproj
deleted file mode 100644
index d4ffb46b2..000000000
--- a/src/png/zlib/contrib/vstudio/vc9/zlibstat.vcproj
+++ /dev/null
@@ -1,835 +0,0 @@
-<?xml version="1.0" encoding="Windows-1252"?>
-<VisualStudioProject
-	ProjectType="Visual C++"
-	Version="9,00"
-	Name="zlibstat"
-	ProjectGUID="{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}"
-	TargetFrameworkVersion="131072"
-	>
-	<Platforms>
-		<Platform
-			Name="Win32"
-		/>
-		<Platform
-			Name="x64"
-		/>
-		<Platform
-			Name="Itanium"
-		/>
-	</Platforms>
-	<ToolFiles>
-	</ToolFiles>
-	<Configurations>
-		<Configuration
-			Name="Debug|Win32"
-			OutputDirectory="x86\ZlibStat$(ConfigurationName)"
-			IntermediateDirectory="x86\ZlibStat$(ConfigurationName)\Tmp"
-			ConfigurationType="4"
-			InheritedPropertySheets="UpgradeFromVC70.vsprops"
-			UseOfMFC="0"
-			ATLMinimizesCRunTimeLibraryUsage="false"
-			>
-			<Tool
-				Name="VCPreBuildEventTool"
-			/>
-			<Tool
-				Name="VCCustomBuildTool"
-			/>
-			<Tool
-				Name="VCXMLDataGeneratorTool"
-			/>
-			<Tool
-				Name="VCWebServiceProxyGeneratorTool"
-			/>
-			<Tool
-				Name="VCMIDLTool"
-			/>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="0"
-				AdditionalIncludeDirectories="..\..\..;..\..\masmx86"
-				PreprocessorDefinitions="WIN32;ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS"
-				ExceptionHandling="0"
-				RuntimeLibrary="1"
-				BufferSecurityCheck="false"
-				PrecompiledHeaderFile="$(IntDir)/zlibstat.pch"
-				AssemblerListingLocation="$(IntDir)\"
-				ObjectFile="$(IntDir)\"
-				ProgramDataBaseFileName="$(OutDir)\"
-				WarningLevel="3"
-				SuppressStartupBanner="true"
-				Detect64BitPortabilityProblems="true"
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diff --git a/src/png/zlib/contrib/vstudio/vc9/zlibvc.def b/src/png/zlib/contrib/vstudio/vc9/zlibvc.def
deleted file mode 100644
index f876c3bca..000000000
--- a/src/png/zlib/contrib/vstudio/vc9/zlibvc.def
+++ /dev/null
@@ -1,153 +0,0 @@
-LIBRARY
-; zlib data compression and ZIP file I/O library
-
-VERSION		1.2
-
-EXPORTS
-        adler32                                  @1
-        compress                                 @2
-        crc32                                    @3
-        deflate                                  @4
-        deflateCopy                              @5
-        deflateEnd                               @6
-        deflateInit2_                            @7
-        deflateInit_                             @8
-        deflateParams                            @9
-        deflateReset                             @10
-        deflateSetDictionary                     @11
-        gzclose                                  @12
-        gzdopen                                  @13
-        gzerror                                  @14
-        gzflush                                  @15
-        gzopen                                   @16
-        gzread                                   @17
-        gzwrite                                  @18
-        inflate                                  @19
-        inflateEnd                               @20
-        inflateInit2_                            @21
-        inflateInit_                             @22
-        inflateReset                             @23
-        inflateSetDictionary                     @24
-        inflateSync                              @25
-        uncompress                               @26
-        zlibVersion                              @27
-        gzprintf                                 @28
-        gzputc                                   @29
-        gzgetc                                   @30
-        gzseek                                   @31
-        gzrewind                                 @32
-        gztell                                   @33
-        gzeof                                    @34
-        gzsetparams                              @35
-        zError                                   @36
-        inflateSyncPoint                         @37
-        get_crc_table                            @38
-        compress2                                @39
-        gzputs                                   @40
-        gzgets                                   @41
-        inflateCopy                              @42
-        inflateBackInit_                         @43
-        inflateBack                              @44
-        inflateBackEnd                           @45
-        compressBound                            @46
-        deflateBound                             @47
-        gzclearerr                               @48
-        gzungetc                                 @49
-        zlibCompileFlags                         @50
-        deflatePrime                             @51
-        deflatePending                           @52
-
-        unzOpen                                  @61
-        unzClose                                 @62
-        unzGetGlobalInfo                         @63
-        unzGetCurrentFileInfo                    @64
-        unzGoToFirstFile                         @65
-        unzGoToNextFile                          @66
-        unzOpenCurrentFile                       @67
-        unzReadCurrentFile                       @68
-        unzOpenCurrentFile3                      @69
-        unztell                                  @70
-        unzeof                                   @71
-        unzCloseCurrentFile                      @72
-        unzGetGlobalComment                      @73
-        unzStringFileNameCompare                 @74
-        unzLocateFile                            @75
-        unzGetLocalExtrafield                    @76
-        unzOpen2                                 @77
-        unzOpenCurrentFile2                      @78
-        unzOpenCurrentFilePassword               @79
-
-        zipOpen                                  @80
-        zipOpenNewFileInZip                      @81
-        zipWriteInFileInZip                      @82
-        zipCloseFileInZip                        @83
-        zipClose                                 @84
-        zipOpenNewFileInZip2                     @86
-        zipCloseFileInZipRaw                     @87
-        zipOpen2                                 @88
-        zipOpenNewFileInZip3                     @89
-
-        unzGetFilePos                            @100
-        unzGoToFilePos                           @101
-
-        fill_win32_filefunc                      @110
-
-; zlibwapi v1.2.4 added:
-        fill_win32_filefunc64                   @111
-        fill_win32_filefunc64A                  @112
-        fill_win32_filefunc64W                  @113
-
-        unzOpen64                               @120
-        unzOpen2_64                             @121
-        unzGetGlobalInfo64                      @122
-        unzGetCurrentFileInfo64                 @124
-        unzGetCurrentFileZStreamPos64           @125
-        unztell64                               @126
-        unzGetFilePos64                         @127
-        unzGoToFilePos64                        @128
-
-        zipOpen64                               @130
-        zipOpen2_64                             @131
-        zipOpenNewFileInZip64                   @132
-        zipOpenNewFileInZip2_64                 @133
-        zipOpenNewFileInZip3_64                 @134
-        zipOpenNewFileInZip4_64                 @135
-        zipCloseFileInZipRaw64                  @136
-
-; zlib1 v1.2.4 added:
-        adler32_combine                         @140
-        crc32_combine                           @142
-        deflateSetHeader                        @144
-        deflateTune                             @145
-        gzbuffer                                @146
-        gzclose_r                               @147
-        gzclose_w                               @148
-        gzdirect                                @149
-        gzoffset                                @150
-        inflateGetHeader                        @156
-        inflateMark                             @157
-        inflatePrime                            @158
-        inflateReset2                           @159
-        inflateUndermine                        @160
-
-; zlib1 v1.2.6 added:
-        gzgetc_                                 @161
-        inflateResetKeep                        @163
-        deflateResetKeep                        @164
-
-; zlib1 v1.2.7 added:
-        gzopen_w                                @165
-
-; zlib1 v1.2.8 added:
-        inflateGetDictionary                    @166
-        gzvprintf                               @167
-
-; zlib1 v1.2.9 added:
-        inflateCodesUsed                        @168
-        inflateValidate                         @169
-        uncompress2                             @170
-        gzfread                                 @171
-        gzfwrite                                @172
-        deflateGetDictionary                    @173
-        adler32_z                               @174
-        crc32_z                                 @175
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deleted file mode 100644
index 75c64c3f4..000000000
--- a/src/png/zlib/contrib/vstudio/vc9/zlibvc.sln
+++ /dev/null
@@ -1,144 +0,0 @@
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-	EndGlobalSection
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diff --git a/src/png/zlib/contrib/vstudio/vc9/zlibvc.vcproj b/src/png/zlib/contrib/vstudio/vc9/zlibvc.vcproj
deleted file mode 100644
index 95bb241f3..000000000
--- a/src/png/zlib/contrib/vstudio/vc9/zlibvc.vcproj
+++ /dev/null
@@ -1,1156 +0,0 @@
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-		/>
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-		/>
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diff --git a/src/png/zlib/crc32.c b/src/png/zlib/crc32.c
deleted file mode 100644
index 9580440c0..000000000
--- a/src/png/zlib/crc32.c
+++ /dev/null
@@ -1,442 +0,0 @@
-/* crc32.c -- compute the CRC-32 of a data stream
- * Copyright (C) 1995-2006, 2010, 2011, 2012, 2016 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- *
- * Thanks to Rodney Brown <rbrown64@csc.com.au> for his contribution of faster
- * CRC methods: exclusive-oring 32 bits of data at a time, and pre-computing
- * tables for updating the shift register in one step with three exclusive-ors
- * instead of four steps with four exclusive-ors.  This results in about a
- * factor of two increase in speed on a Power PC G4 (PPC7455) using gcc -O3.
- */
-
-/* @(#) $Id$ */
-
-/*
-  Note on the use of DYNAMIC_CRC_TABLE: there is no mutex or semaphore
-  protection on the static variables used to control the first-use generation
-  of the crc tables.  Therefore, if you #define DYNAMIC_CRC_TABLE, you should
-  first call get_crc_table() to initialize the tables before allowing more than
-  one thread to use crc32().
-
-  DYNAMIC_CRC_TABLE and MAKECRCH can be #defined to write out crc32.h.
- */
-
-#ifdef MAKECRCH
-#  include <stdio.h>
-#  ifndef DYNAMIC_CRC_TABLE
-#    define DYNAMIC_CRC_TABLE
-#  endif /* !DYNAMIC_CRC_TABLE */
-#endif /* MAKECRCH */
-
-#include "zutil.h"      /* for STDC and FAR definitions */
-
-/* Definitions for doing the crc four data bytes at a time. */
-#if !defined(NOBYFOUR) && defined(Z_U4)
-#  define BYFOUR
-#endif
-#ifdef BYFOUR
-   local unsigned long crc32_little OF((unsigned long,
-                        const unsigned char FAR *, z_size_t));
-   local unsigned long crc32_big OF((unsigned long,
-                        const unsigned char FAR *, z_size_t));
-#  define TBLS 8
-#else
-#  define TBLS 1
-#endif /* BYFOUR */
-
-/* Local functions for crc concatenation */
-local unsigned long gf2_matrix_times OF((unsigned long *mat,
-                                         unsigned long vec));
-local void gf2_matrix_square OF((unsigned long *square, unsigned long *mat));
-local uLong crc32_combine_ OF((uLong crc1, uLong crc2, z_off64_t len2));
-
-
-#ifdef DYNAMIC_CRC_TABLE
-
-local volatile int crc_table_empty = 1;
-local z_crc_t FAR crc_table[TBLS][256];
-local void make_crc_table OF((void));
-#ifdef MAKECRCH
-   local void write_table OF((FILE *, const z_crc_t FAR *));
-#endif /* MAKECRCH */
-/*
-  Generate tables for a byte-wise 32-bit CRC calculation on the polynomial:
-  x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1.
-
-  Polynomials over GF(2) are represented in binary, one bit per coefficient,
-  with the lowest powers in the most significant bit.  Then adding polynomials
-  is just exclusive-or, and multiplying a polynomial by x is a right shift by
-  one.  If we call the above polynomial p, and represent a byte as the
-  polynomial q, also with the lowest power in the most significant bit (so the
-  byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
-  where a mod b means the remainder after dividing a by b.
-
-  This calculation is done using the shift-register method of multiplying and
-  taking the remainder.  The register is initialized to zero, and for each
-  incoming bit, x^32 is added mod p to the register if the bit is a one (where
-  x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by
-  x (which is shifting right by one and adding x^32 mod p if the bit shifted
-  out is a one).  We start with the highest power (least significant bit) of
-  q and repeat for all eight bits of q.
-
-  The first table is simply the CRC of all possible eight bit values.  This is
-  all the information needed to generate CRCs on data a byte at a time for all
-  combinations of CRC register values and incoming bytes.  The remaining tables
-  allow for word-at-a-time CRC calculation for both big-endian and little-
-  endian machines, where a word is four bytes.
-*/
-local void make_crc_table()
-{
-    z_crc_t c;
-    int n, k;
-    z_crc_t poly;                       /* polynomial exclusive-or pattern */
-    /* terms of polynomial defining this crc (except x^32): */
-    static volatile int first = 1;      /* flag to limit concurrent making */
-    static const unsigned char p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};
-
-    /* See if another task is already doing this (not thread-safe, but better
-       than nothing -- significantly reduces duration of vulnerability in
-       case the advice about DYNAMIC_CRC_TABLE is ignored) */
-    if (first) {
-        first = 0;
-
-        /* make exclusive-or pattern from polynomial (0xedb88320UL) */
-        poly = 0;
-        for (n = 0; n < (int)(sizeof(p)/sizeof(unsigned char)); n++)
-            poly |= (z_crc_t)1 << (31 - p[n]);
-
-        /* generate a crc for every 8-bit value */
-        for (n = 0; n < 256; n++) {
-            c = (z_crc_t)n;
-            for (k = 0; k < 8; k++)
-                c = c & 1 ? poly ^ (c >> 1) : c >> 1;
-            crc_table[0][n] = c;
-        }
-
-#ifdef BYFOUR
-        /* generate crc for each value followed by one, two, and three zeros,
-           and then the byte reversal of those as well as the first table */
-        for (n = 0; n < 256; n++) {
-            c = crc_table[0][n];
-            crc_table[4][n] = ZSWAP32(c);
-            for (k = 1; k < 4; k++) {
-                c = crc_table[0][c & 0xff] ^ (c >> 8);
-                crc_table[k][n] = c;
-                crc_table[k + 4][n] = ZSWAP32(c);
-            }
-        }
-#endif /* BYFOUR */
-
-        crc_table_empty = 0;
-    }
-    else {      /* not first */
-        /* wait for the other guy to finish (not efficient, but rare) */
-        while (crc_table_empty)
-            ;
-    }
-
-#ifdef MAKECRCH
-    /* write out CRC tables to crc32.h */
-    {
-        FILE *out;
-
-        out = fopen("crc32.h", "w");
-        if (out == NULL) return;
-        fprintf(out, "/* crc32.h -- tables for rapid CRC calculation\n");
-        fprintf(out, " * Generated automatically by crc32.c\n */\n\n");
-        fprintf(out, "local const z_crc_t FAR ");
-        fprintf(out, "crc_table[TBLS][256] =\n{\n  {\n");
-        write_table(out, crc_table[0]);
-#  ifdef BYFOUR
-        fprintf(out, "#ifdef BYFOUR\n");
-        for (k = 1; k < 8; k++) {
-            fprintf(out, "  },\n  {\n");
-            write_table(out, crc_table[k]);
-        }
-        fprintf(out, "#endif\n");
-#  endif /* BYFOUR */
-        fprintf(out, "  }\n};\n");
-        fclose(out);
-    }
-#endif /* MAKECRCH */
-}
-
-#ifdef MAKECRCH
-local void write_table(out, table)
-    FILE *out;
-    const z_crc_t FAR *table;
-{
-    int n;
-
-    for (n = 0; n < 256; n++)
-        fprintf(out, "%s0x%08lxUL%s", n % 5 ? "" : "    ",
-                (unsigned long)(table[n]),
-                n == 255 ? "\n" : (n % 5 == 4 ? ",\n" : ", "));
-}
-#endif /* MAKECRCH */
-
-#else /* !DYNAMIC_CRC_TABLE */
-/* ========================================================================
- * Tables of CRC-32s of all single-byte values, made by make_crc_table().
- */
-#include "crc32.h"
-#endif /* DYNAMIC_CRC_TABLE */
-
-/* =========================================================================
- * This function can be used by asm versions of crc32()
- */
-const z_crc_t FAR * ZEXPORT get_crc_table()
-{
-#ifdef DYNAMIC_CRC_TABLE
-    if (crc_table_empty)
-        make_crc_table();
-#endif /* DYNAMIC_CRC_TABLE */
-    return (const z_crc_t FAR *)crc_table;
-}
-
-/* ========================================================================= */
-#define DO1 crc = crc_table[0][((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8)
-#define DO8 DO1; DO1; DO1; DO1; DO1; DO1; DO1; DO1
-
-/* ========================================================================= */
-unsigned long ZEXPORT crc32_z(crc, buf, len)
-    unsigned long crc;
-    const unsigned char FAR *buf;
-    z_size_t len;
-{
-    if (buf == Z_NULL) return 0UL;
-
-#ifdef DYNAMIC_CRC_TABLE
-    if (crc_table_empty)
-        make_crc_table();
-#endif /* DYNAMIC_CRC_TABLE */
-
-#ifdef BYFOUR
-    if (sizeof(void *) == sizeof(ptrdiff_t)) {
-        z_crc_t endian;
-
-        endian = 1;
-        if (*((unsigned char *)(&endian)))
-            return crc32_little(crc, buf, len);
-        else
-            return crc32_big(crc, buf, len);
-    }
-#endif /* BYFOUR */
-    crc = crc ^ 0xffffffffUL;
-    while (len >= 8) {
-        DO8;
-        len -= 8;
-    }
-    if (len) do {
-        DO1;
-    } while (--len);
-    return crc ^ 0xffffffffUL;
-}
-
-/* ========================================================================= */
-unsigned long ZEXPORT crc32(crc, buf, len)
-    unsigned long crc;
-    const unsigned char FAR *buf;
-    uInt len;
-{
-    return crc32_z(crc, buf, len);
-}
-
-#ifdef BYFOUR
-
-/*
-   This BYFOUR code accesses the passed unsigned char * buffer with a 32-bit
-   integer pointer type. This violates the strict aliasing rule, where a
-   compiler can assume, for optimization purposes, that two pointers to
-   fundamentally different types won't ever point to the same memory. This can
-   manifest as a problem only if one of the pointers is written to. This code
-   only reads from those pointers. So long as this code remains isolated in
-   this compilation unit, there won't be a problem. For this reason, this code
-   should not be copied and pasted into a compilation unit in which other code
-   writes to the buffer that is passed to these routines.
- */
-
-/* ========================================================================= */
-#define DOLIT4 c ^= *buf4++; \
-        c = crc_table[3][c & 0xff] ^ crc_table[2][(c >> 8) & 0xff] ^ \
-            crc_table[1][(c >> 16) & 0xff] ^ crc_table[0][c >> 24]
-#define DOLIT32 DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4
-
-/* ========================================================================= */
-local unsigned long crc32_little(crc, buf, len)
-    unsigned long crc;
-    const unsigned char FAR *buf;
-    z_size_t len;
-{
-    register z_crc_t c;
-    register const z_crc_t FAR *buf4;
-
-    c = (z_crc_t)crc;
-    c = ~c;
-    while (len && ((ptrdiff_t)buf & 3)) {
-        c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);
-        len--;
-    }
-
-    buf4 = (const z_crc_t FAR *)(const void FAR *)buf;
-    while (len >= 32) {
-        DOLIT32;
-        len -= 32;
-    }
-    while (len >= 4) {
-        DOLIT4;
-        len -= 4;
-    }
-    buf = (const unsigned char FAR *)buf4;
-
-    if (len) do {
-        c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);
-    } while (--len);
-    c = ~c;
-    return (unsigned long)c;
-}
-
-/* ========================================================================= */
-#define DOBIG4 c ^= *buf4++; \
-        c = crc_table[4][c & 0xff] ^ crc_table[5][(c >> 8) & 0xff] ^ \
-            crc_table[6][(c >> 16) & 0xff] ^ crc_table[7][c >> 24]
-#define DOBIG32 DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4
-
-/* ========================================================================= */
-local unsigned long crc32_big(crc, buf, len)
-    unsigned long crc;
-    const unsigned char FAR *buf;
-    z_size_t len;
-{
-    register z_crc_t c;
-    register const z_crc_t FAR *buf4;
-
-    c = ZSWAP32((z_crc_t)crc);
-    c = ~c;
-    while (len && ((ptrdiff_t)buf & 3)) {
-        c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8);
-        len--;
-    }
-
-    buf4 = (const z_crc_t FAR *)(const void FAR *)buf;
-    while (len >= 32) {
-        DOBIG32;
-        len -= 32;
-    }
-    while (len >= 4) {
-        DOBIG4;
-        len -= 4;
-    }
-    buf = (const unsigned char FAR *)buf4;
-
-    if (len) do {
-        c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8);
-    } while (--len);
-    c = ~c;
-    return (unsigned long)(ZSWAP32(c));
-}
-
-#endif /* BYFOUR */
-
-#define GF2_DIM 32      /* dimension of GF(2) vectors (length of CRC) */
-
-/* ========================================================================= */
-local unsigned long gf2_matrix_times(mat, vec)
-    unsigned long *mat;
-    unsigned long vec;
-{
-    unsigned long sum;
-
-    sum = 0;
-    while (vec) {
-        if (vec & 1)
-            sum ^= *mat;
-        vec >>= 1;
-        mat++;
-    }
-    return sum;
-}
-
-/* ========================================================================= */
-local void gf2_matrix_square(square, mat)
-    unsigned long *square;
-    unsigned long *mat;
-{
-    int n;
-
-    for (n = 0; n < GF2_DIM; n++)
-        square[n] = gf2_matrix_times(mat, mat[n]);
-}
-
-/* ========================================================================= */
-local uLong crc32_combine_(crc1, crc2, len2)
-    uLong crc1;
-    uLong crc2;
-    z_off64_t len2;
-{
-    int n;
-    unsigned long row;
-    unsigned long even[GF2_DIM];    /* even-power-of-two zeros operator */
-    unsigned long odd[GF2_DIM];     /* odd-power-of-two zeros operator */
-
-    /* degenerate case (also disallow negative lengths) */
-    if (len2 <= 0)
-        return crc1;
-
-    /* put operator for one zero bit in odd */
-    odd[0] = 0xedb88320UL;          /* CRC-32 polynomial */
-    row = 1;
-    for (n = 1; n < GF2_DIM; n++) {
-        odd[n] = row;
-        row <<= 1;
-    }
-
-    /* put operator for two zero bits in even */
-    gf2_matrix_square(even, odd);
-
-    /* put operator for four zero bits in odd */
-    gf2_matrix_square(odd, even);
-
-    /* apply len2 zeros to crc1 (first square will put the operator for one
-       zero byte, eight zero bits, in even) */
-    do {
-        /* apply zeros operator for this bit of len2 */
-        gf2_matrix_square(even, odd);
-        if (len2 & 1)
-            crc1 = gf2_matrix_times(even, crc1);
-        len2 >>= 1;
-
-        /* if no more bits set, then done */
-        if (len2 == 0)
-            break;
-
-        /* another iteration of the loop with odd and even swapped */
-        gf2_matrix_square(odd, even);
-        if (len2 & 1)
-            crc1 = gf2_matrix_times(odd, crc1);
-        len2 >>= 1;
-
-        /* if no more bits set, then done */
-    } while (len2 != 0);
-
-    /* return combined crc */
-    crc1 ^= crc2;
-    return crc1;
-}
-
-/* ========================================================================= */
-uLong ZEXPORT crc32_combine(crc1, crc2, len2)
-    uLong crc1;
-    uLong crc2;
-    z_off_t len2;
-{
-    return crc32_combine_(crc1, crc2, len2);
-}
-
-uLong ZEXPORT crc32_combine64(crc1, crc2, len2)
-    uLong crc1;
-    uLong crc2;
-    z_off64_t len2;
-{
-    return crc32_combine_(crc1, crc2, len2);
-}
diff --git a/src/png/zlib/crc32.h b/src/png/zlib/crc32.h
deleted file mode 100644
index 9e0c77810..000000000
--- a/src/png/zlib/crc32.h
+++ /dev/null
@@ -1,441 +0,0 @@
-/* crc32.h -- tables for rapid CRC calculation
- * Generated automatically by crc32.c
- */
-
-local const z_crc_t FAR crc_table[TBLS][256] =
-{
-  {
-    0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL,
-    0x706af48fUL, 0xe963a535UL, 0x9e6495a3UL, 0x0edb8832UL, 0x79dcb8a4UL,
-    0xe0d5e91eUL, 0x97d2d988UL, 0x09b64c2bUL, 0x7eb17cbdUL, 0xe7b82d07UL,
-    0x90bf1d91UL, 0x1db71064UL, 0x6ab020f2UL, 0xf3b97148UL, 0x84be41deUL,
-    0x1adad47dUL, 0x6ddde4ebUL, 0xf4d4b551UL, 0x83d385c7UL, 0x136c9856UL,
-    0x646ba8c0UL, 0xfd62f97aUL, 0x8a65c9ecUL, 0x14015c4fUL, 0x63066cd9UL,
-    0xfa0f3d63UL, 0x8d080df5UL, 0x3b6e20c8UL, 0x4c69105eUL, 0xd56041e4UL,
-    0xa2677172UL, 0x3c03e4d1UL, 0x4b04d447UL, 0xd20d85fdUL, 0xa50ab56bUL,
-    0x35b5a8faUL, 0x42b2986cUL, 0xdbbbc9d6UL, 0xacbcf940UL, 0x32d86ce3UL,
-    0x45df5c75UL, 0xdcd60dcfUL, 0xabd13d59UL, 0x26d930acUL, 0x51de003aUL,
-    0xc8d75180UL, 0xbfd06116UL, 0x21b4f4b5UL, 0x56b3c423UL, 0xcfba9599UL,
-    0xb8bda50fUL, 0x2802b89eUL, 0x5f058808UL, 0xc60cd9b2UL, 0xb10be924UL,
-    0x2f6f7c87UL, 0x58684c11UL, 0xc1611dabUL, 0xb6662d3dUL, 0x76dc4190UL,
-    0x01db7106UL, 0x98d220bcUL, 0xefd5102aUL, 0x71b18589UL, 0x06b6b51fUL,
-    0x9fbfe4a5UL, 0xe8b8d433UL, 0x7807c9a2UL, 0x0f00f934UL, 0x9609a88eUL,
-    0xe10e9818UL, 0x7f6a0dbbUL, 0x086d3d2dUL, 0x91646c97UL, 0xe6635c01UL,
-    0x6b6b51f4UL, 0x1c6c6162UL, 0x856530d8UL, 0xf262004eUL, 0x6c0695edUL,
-    0x1b01a57bUL, 0x8208f4c1UL, 0xf50fc457UL, 0x65b0d9c6UL, 0x12b7e950UL,
-    0x8bbeb8eaUL, 0xfcb9887cUL, 0x62dd1ddfUL, 0x15da2d49UL, 0x8cd37cf3UL,
-    0xfbd44c65UL, 0x4db26158UL, 0x3ab551ceUL, 0xa3bc0074UL, 0xd4bb30e2UL,
-    0x4adfa541UL, 0x3dd895d7UL, 0xa4d1c46dUL, 0xd3d6f4fbUL, 0x4369e96aUL,
-    0x346ed9fcUL, 0xad678846UL, 0xda60b8d0UL, 0x44042d73UL, 0x33031de5UL,
-    0xaa0a4c5fUL, 0xdd0d7cc9UL, 0x5005713cUL, 0x270241aaUL, 0xbe0b1010UL,
-    0xc90c2086UL, 0x5768b525UL, 0x206f85b3UL, 0xb966d409UL, 0xce61e49fUL,
-    0x5edef90eUL, 0x29d9c998UL, 0xb0d09822UL, 0xc7d7a8b4UL, 0x59b33d17UL,
-    0x2eb40d81UL, 0xb7bd5c3bUL, 0xc0ba6cadUL, 0xedb88320UL, 0x9abfb3b6UL,
-    0x03b6e20cUL, 0x74b1d29aUL, 0xead54739UL, 0x9dd277afUL, 0x04db2615UL,
-    0x73dc1683UL, 0xe3630b12UL, 0x94643b84UL, 0x0d6d6a3eUL, 0x7a6a5aa8UL,
-    0xe40ecf0bUL, 0x9309ff9dUL, 0x0a00ae27UL, 0x7d079eb1UL, 0xf00f9344UL,
-    0x8708a3d2UL, 0x1e01f268UL, 0x6906c2feUL, 0xf762575dUL, 0x806567cbUL,
-    0x196c3671UL, 0x6e6b06e7UL, 0xfed41b76UL, 0x89d32be0UL, 0x10da7a5aUL,
-    0x67dd4accUL, 0xf9b9df6fUL, 0x8ebeeff9UL, 0x17b7be43UL, 0x60b08ed5UL,
-    0xd6d6a3e8UL, 0xa1d1937eUL, 0x38d8c2c4UL, 0x4fdff252UL, 0xd1bb67f1UL,
-    0xa6bc5767UL, 0x3fb506ddUL, 0x48b2364bUL, 0xd80d2bdaUL, 0xaf0a1b4cUL,
-    0x36034af6UL, 0x41047a60UL, 0xdf60efc3UL, 0xa867df55UL, 0x316e8eefUL,
-    0x4669be79UL, 0xcb61b38cUL, 0xbc66831aUL, 0x256fd2a0UL, 0x5268e236UL,
-    0xcc0c7795UL, 0xbb0b4703UL, 0x220216b9UL, 0x5505262fUL, 0xc5ba3bbeUL,
-    0xb2bd0b28UL, 0x2bb45a92UL, 0x5cb36a04UL, 0xc2d7ffa7UL, 0xb5d0cf31UL,
-    0x2cd99e8bUL, 0x5bdeae1dUL, 0x9b64c2b0UL, 0xec63f226UL, 0x756aa39cUL,
-    0x026d930aUL, 0x9c0906a9UL, 0xeb0e363fUL, 0x72076785UL, 0x05005713UL,
-    0x95bf4a82UL, 0xe2b87a14UL, 0x7bb12baeUL, 0x0cb61b38UL, 0x92d28e9bUL,
-    0xe5d5be0dUL, 0x7cdcefb7UL, 0x0bdbdf21UL, 0x86d3d2d4UL, 0xf1d4e242UL,
-    0x68ddb3f8UL, 0x1fda836eUL, 0x81be16cdUL, 0xf6b9265bUL, 0x6fb077e1UL,
-    0x18b74777UL, 0x88085ae6UL, 0xff0f6a70UL, 0x66063bcaUL, 0x11010b5cUL,
-    0x8f659effUL, 0xf862ae69UL, 0x616bffd3UL, 0x166ccf45UL, 0xa00ae278UL,
-    0xd70dd2eeUL, 0x4e048354UL, 0x3903b3c2UL, 0xa7672661UL, 0xd06016f7UL,
-    0x4969474dUL, 0x3e6e77dbUL, 0xaed16a4aUL, 0xd9d65adcUL, 0x40df0b66UL,
-    0x37d83bf0UL, 0xa9bcae53UL, 0xdebb9ec5UL, 0x47b2cf7fUL, 0x30b5ffe9UL,
-    0xbdbdf21cUL, 0xcabac28aUL, 0x53b39330UL, 0x24b4a3a6UL, 0xbad03605UL,
-    0xcdd70693UL, 0x54de5729UL, 0x23d967bfUL, 0xb3667a2eUL, 0xc4614ab8UL,
-    0x5d681b02UL, 0x2a6f2b94UL, 0xb40bbe37UL, 0xc30c8ea1UL, 0x5a05df1bUL,
-    0x2d02ef8dUL
-#ifdef BYFOUR
-  },
-  {
-    0x00000000UL, 0x191b3141UL, 0x32366282UL, 0x2b2d53c3UL, 0x646cc504UL,
-    0x7d77f445UL, 0x565aa786UL, 0x4f4196c7UL, 0xc8d98a08UL, 0xd1c2bb49UL,
-    0xfaefe88aUL, 0xe3f4d9cbUL, 0xacb54f0cUL, 0xb5ae7e4dUL, 0x9e832d8eUL,
-    0x87981ccfUL, 0x4ac21251UL, 0x53d92310UL, 0x78f470d3UL, 0x61ef4192UL,
-    0x2eaed755UL, 0x37b5e614UL, 0x1c98b5d7UL, 0x05838496UL, 0x821b9859UL,
-    0x9b00a918UL, 0xb02dfadbUL, 0xa936cb9aUL, 0xe6775d5dUL, 0xff6c6c1cUL,
-    0xd4413fdfUL, 0xcd5a0e9eUL, 0x958424a2UL, 0x8c9f15e3UL, 0xa7b24620UL,
-    0xbea97761UL, 0xf1e8e1a6UL, 0xe8f3d0e7UL, 0xc3de8324UL, 0xdac5b265UL,
-    0x5d5daeaaUL, 0x44469febUL, 0x6f6bcc28UL, 0x7670fd69UL, 0x39316baeUL,
-    0x202a5aefUL, 0x0b07092cUL, 0x121c386dUL, 0xdf4636f3UL, 0xc65d07b2UL,
-    0xed705471UL, 0xf46b6530UL, 0xbb2af3f7UL, 0xa231c2b6UL, 0x891c9175UL,
-    0x9007a034UL, 0x179fbcfbUL, 0x0e848dbaUL, 0x25a9de79UL, 0x3cb2ef38UL,
-    0x73f379ffUL, 0x6ae848beUL, 0x41c51b7dUL, 0x58de2a3cUL, 0xf0794f05UL,
-    0xe9627e44UL, 0xc24f2d87UL, 0xdb541cc6UL, 0x94158a01UL, 0x8d0ebb40UL,
-    0xa623e883UL, 0xbf38d9c2UL, 0x38a0c50dUL, 0x21bbf44cUL, 0x0a96a78fUL,
-    0x138d96ceUL, 0x5ccc0009UL, 0x45d73148UL, 0x6efa628bUL, 0x77e153caUL,
-    0xbabb5d54UL, 0xa3a06c15UL, 0x888d3fd6UL, 0x91960e97UL, 0xded79850UL,
-    0xc7cca911UL, 0xece1fad2UL, 0xf5facb93UL, 0x7262d75cUL, 0x6b79e61dUL,
-    0x4054b5deUL, 0x594f849fUL, 0x160e1258UL, 0x0f152319UL, 0x243870daUL,
-    0x3d23419bUL, 0x65fd6ba7UL, 0x7ce65ae6UL, 0x57cb0925UL, 0x4ed03864UL,
-    0x0191aea3UL, 0x188a9fe2UL, 0x33a7cc21UL, 0x2abcfd60UL, 0xad24e1afUL,
-    0xb43fd0eeUL, 0x9f12832dUL, 0x8609b26cUL, 0xc94824abUL, 0xd05315eaUL,
-    0xfb7e4629UL, 0xe2657768UL, 0x2f3f79f6UL, 0x362448b7UL, 0x1d091b74UL,
-    0x04122a35UL, 0x4b53bcf2UL, 0x52488db3UL, 0x7965de70UL, 0x607eef31UL,
-    0xe7e6f3feUL, 0xfefdc2bfUL, 0xd5d0917cUL, 0xcccba03dUL, 0x838a36faUL,
-    0x9a9107bbUL, 0xb1bc5478UL, 0xa8a76539UL, 0x3b83984bUL, 0x2298a90aUL,
-    0x09b5fac9UL, 0x10aecb88UL, 0x5fef5d4fUL, 0x46f46c0eUL, 0x6dd93fcdUL,
-    0x74c20e8cUL, 0xf35a1243UL, 0xea412302UL, 0xc16c70c1UL, 0xd8774180UL,
-    0x9736d747UL, 0x8e2de606UL, 0xa500b5c5UL, 0xbc1b8484UL, 0x71418a1aUL,
-    0x685abb5bUL, 0x4377e898UL, 0x5a6cd9d9UL, 0x152d4f1eUL, 0x0c367e5fUL,
-    0x271b2d9cUL, 0x3e001cddUL, 0xb9980012UL, 0xa0833153UL, 0x8bae6290UL,
-    0x92b553d1UL, 0xddf4c516UL, 0xc4eff457UL, 0xefc2a794UL, 0xf6d996d5UL,
-    0xae07bce9UL, 0xb71c8da8UL, 0x9c31de6bUL, 0x852aef2aUL, 0xca6b79edUL,
-    0xd37048acUL, 0xf85d1b6fUL, 0xe1462a2eUL, 0x66de36e1UL, 0x7fc507a0UL,
-    0x54e85463UL, 0x4df36522UL, 0x02b2f3e5UL, 0x1ba9c2a4UL, 0x30849167UL,
-    0x299fa026UL, 0xe4c5aeb8UL, 0xfdde9ff9UL, 0xd6f3cc3aUL, 0xcfe8fd7bUL,
-    0x80a96bbcUL, 0x99b25afdUL, 0xb29f093eUL, 0xab84387fUL, 0x2c1c24b0UL,
-    0x350715f1UL, 0x1e2a4632UL, 0x07317773UL, 0x4870e1b4UL, 0x516bd0f5UL,
-    0x7a468336UL, 0x635db277UL, 0xcbfad74eUL, 0xd2e1e60fUL, 0xf9ccb5ccUL,
-    0xe0d7848dUL, 0xaf96124aUL, 0xb68d230bUL, 0x9da070c8UL, 0x84bb4189UL,
-    0x03235d46UL, 0x1a386c07UL, 0x31153fc4UL, 0x280e0e85UL, 0x674f9842UL,
-    0x7e54a903UL, 0x5579fac0UL, 0x4c62cb81UL, 0x8138c51fUL, 0x9823f45eUL,
-    0xb30ea79dUL, 0xaa1596dcUL, 0xe554001bUL, 0xfc4f315aUL, 0xd7626299UL,
-    0xce7953d8UL, 0x49e14f17UL, 0x50fa7e56UL, 0x7bd72d95UL, 0x62cc1cd4UL,
-    0x2d8d8a13UL, 0x3496bb52UL, 0x1fbbe891UL, 0x06a0d9d0UL, 0x5e7ef3ecUL,
-    0x4765c2adUL, 0x6c48916eUL, 0x7553a02fUL, 0x3a1236e8UL, 0x230907a9UL,
-    0x0824546aUL, 0x113f652bUL, 0x96a779e4UL, 0x8fbc48a5UL, 0xa4911b66UL,
-    0xbd8a2a27UL, 0xf2cbbce0UL, 0xebd08da1UL, 0xc0fdde62UL, 0xd9e6ef23UL,
-    0x14bce1bdUL, 0x0da7d0fcUL, 0x268a833fUL, 0x3f91b27eUL, 0x70d024b9UL,
-    0x69cb15f8UL, 0x42e6463bUL, 0x5bfd777aUL, 0xdc656bb5UL, 0xc57e5af4UL,
-    0xee530937UL, 0xf7483876UL, 0xb809aeb1UL, 0xa1129ff0UL, 0x8a3fcc33UL,
-    0x9324fd72UL
-  },
-  {
-    0x00000000UL, 0x01c26a37UL, 0x0384d46eUL, 0x0246be59UL, 0x0709a8dcUL,
-    0x06cbc2ebUL, 0x048d7cb2UL, 0x054f1685UL, 0x0e1351b8UL, 0x0fd13b8fUL,
-    0x0d9785d6UL, 0x0c55efe1UL, 0x091af964UL, 0x08d89353UL, 0x0a9e2d0aUL,
-    0x0b5c473dUL, 0x1c26a370UL, 0x1de4c947UL, 0x1fa2771eUL, 0x1e601d29UL,
-    0x1b2f0bacUL, 0x1aed619bUL, 0x18abdfc2UL, 0x1969b5f5UL, 0x1235f2c8UL,
-    0x13f798ffUL, 0x11b126a6UL, 0x10734c91UL, 0x153c5a14UL, 0x14fe3023UL,
-    0x16b88e7aUL, 0x177ae44dUL, 0x384d46e0UL, 0x398f2cd7UL, 0x3bc9928eUL,
-    0x3a0bf8b9UL, 0x3f44ee3cUL, 0x3e86840bUL, 0x3cc03a52UL, 0x3d025065UL,
-    0x365e1758UL, 0x379c7d6fUL, 0x35dac336UL, 0x3418a901UL, 0x3157bf84UL,
-    0x3095d5b3UL, 0x32d36beaUL, 0x331101ddUL, 0x246be590UL, 0x25a98fa7UL,
-    0x27ef31feUL, 0x262d5bc9UL, 0x23624d4cUL, 0x22a0277bUL, 0x20e69922UL,
-    0x2124f315UL, 0x2a78b428UL, 0x2bbade1fUL, 0x29fc6046UL, 0x283e0a71UL,
-    0x2d711cf4UL, 0x2cb376c3UL, 0x2ef5c89aUL, 0x2f37a2adUL, 0x709a8dc0UL,
-    0x7158e7f7UL, 0x731e59aeUL, 0x72dc3399UL, 0x7793251cUL, 0x76514f2bUL,
-    0x7417f172UL, 0x75d59b45UL, 0x7e89dc78UL, 0x7f4bb64fUL, 0x7d0d0816UL,
-    0x7ccf6221UL, 0x798074a4UL, 0x78421e93UL, 0x7a04a0caUL, 0x7bc6cafdUL,
-    0x6cbc2eb0UL, 0x6d7e4487UL, 0x6f38fadeUL, 0x6efa90e9UL, 0x6bb5866cUL,
-    0x6a77ec5bUL, 0x68315202UL, 0x69f33835UL, 0x62af7f08UL, 0x636d153fUL,
-    0x612bab66UL, 0x60e9c151UL, 0x65a6d7d4UL, 0x6464bde3UL, 0x662203baUL,
-    0x67e0698dUL, 0x48d7cb20UL, 0x4915a117UL, 0x4b531f4eUL, 0x4a917579UL,
-    0x4fde63fcUL, 0x4e1c09cbUL, 0x4c5ab792UL, 0x4d98dda5UL, 0x46c49a98UL,
-    0x4706f0afUL, 0x45404ef6UL, 0x448224c1UL, 0x41cd3244UL, 0x400f5873UL,
-    0x4249e62aUL, 0x438b8c1dUL, 0x54f16850UL, 0x55330267UL, 0x5775bc3eUL,
-    0x56b7d609UL, 0x53f8c08cUL, 0x523aaabbUL, 0x507c14e2UL, 0x51be7ed5UL,
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-    0x3683467aUL, 0x77b25d63UL, 0x4ed7facbUL, 0x0fe6e1d2UL, 0xccb5ccf9UL,
-    0x8d84d7e0UL, 0x4a1296afUL, 0x0b238db6UL, 0xc870a09dUL, 0x8941bb84UL,
-    0x465d2303UL, 0x076c381aUL, 0xc43f1531UL, 0x850e0e28UL, 0x42984f67UL,
-    0x03a9547eUL, 0xc0fa7955UL, 0x81cb624cUL, 0x1fc53881UL, 0x5ef42398UL,
-    0x9da70eb3UL, 0xdc9615aaUL, 0x1b0054e5UL, 0x5a314ffcUL, 0x996262d7UL,
-    0xd85379ceUL, 0x174fe149UL, 0x567efa50UL, 0x952dd77bUL, 0xd41ccc62UL,
-    0x138a8d2dUL, 0x52bb9634UL, 0x91e8bb1fUL, 0xd0d9a006UL, 0xecf37e5eUL,
-    0xadc26547UL, 0x6e91486cUL, 0x2fa05375UL, 0xe836123aUL, 0xa9070923UL,
-    0x6a542408UL, 0x2b653f11UL, 0xe479a796UL, 0xa548bc8fUL, 0x661b91a4UL,
-    0x272a8abdUL, 0xe0bccbf2UL, 0xa18dd0ebUL, 0x62defdc0UL, 0x23efe6d9UL,
-    0xbde1bc14UL, 0xfcd0a70dUL, 0x3f838a26UL, 0x7eb2913fUL, 0xb924d070UL,
-    0xf815cb69UL, 0x3b46e642UL, 0x7a77fd5bUL, 0xb56b65dcUL, 0xf45a7ec5UL,
-    0x370953eeUL, 0x763848f7UL, 0xb1ae09b8UL, 0xf09f12a1UL, 0x33cc3f8aUL,
-    0x72fd2493UL
-  },
-  {
-    0x00000000UL, 0x376ac201UL, 0x6ed48403UL, 0x59be4602UL, 0xdca80907UL,
-    0xebc2cb06UL, 0xb27c8d04UL, 0x85164f05UL, 0xb851130eUL, 0x8f3bd10fUL,
-    0xd685970dUL, 0xe1ef550cUL, 0x64f91a09UL, 0x5393d808UL, 0x0a2d9e0aUL,
-    0x3d475c0bUL, 0x70a3261cUL, 0x47c9e41dUL, 0x1e77a21fUL, 0x291d601eUL,
-    0xac0b2f1bUL, 0x9b61ed1aUL, 0xc2dfab18UL, 0xf5b56919UL, 0xc8f23512UL,
-    0xff98f713UL, 0xa626b111UL, 0x914c7310UL, 0x145a3c15UL, 0x2330fe14UL,
-    0x7a8eb816UL, 0x4de47a17UL, 0xe0464d38UL, 0xd72c8f39UL, 0x8e92c93bUL,
-    0xb9f80b3aUL, 0x3cee443fUL, 0x0b84863eUL, 0x523ac03cUL, 0x6550023dUL,
-    0x58175e36UL, 0x6f7d9c37UL, 0x36c3da35UL, 0x01a91834UL, 0x84bf5731UL,
-    0xb3d59530UL, 0xea6bd332UL, 0xdd011133UL, 0x90e56b24UL, 0xa78fa925UL,
-    0xfe31ef27UL, 0xc95b2d26UL, 0x4c4d6223UL, 0x7b27a022UL, 0x2299e620UL,
-    0x15f32421UL, 0x28b4782aUL, 0x1fdeba2bUL, 0x4660fc29UL, 0x710a3e28UL,
-    0xf41c712dUL, 0xc376b32cUL, 0x9ac8f52eUL, 0xada2372fUL, 0xc08d9a70UL,
-    0xf7e75871UL, 0xae591e73UL, 0x9933dc72UL, 0x1c259377UL, 0x2b4f5176UL,
-    0x72f11774UL, 0x459bd575UL, 0x78dc897eUL, 0x4fb64b7fUL, 0x16080d7dUL,
-    0x2162cf7cUL, 0xa4748079UL, 0x931e4278UL, 0xcaa0047aUL, 0xfdcac67bUL,
-    0xb02ebc6cUL, 0x87447e6dUL, 0xdefa386fUL, 0xe990fa6eUL, 0x6c86b56bUL,
-    0x5bec776aUL, 0x02523168UL, 0x3538f369UL, 0x087faf62UL, 0x3f156d63UL,
-    0x66ab2b61UL, 0x51c1e960UL, 0xd4d7a665UL, 0xe3bd6464UL, 0xba032266UL,
-    0x8d69e067UL, 0x20cbd748UL, 0x17a11549UL, 0x4e1f534bUL, 0x7975914aUL,
-    0xfc63de4fUL, 0xcb091c4eUL, 0x92b75a4cUL, 0xa5dd984dUL, 0x989ac446UL,
-    0xaff00647UL, 0xf64e4045UL, 0xc1248244UL, 0x4432cd41UL, 0x73580f40UL,
-    0x2ae64942UL, 0x1d8c8b43UL, 0x5068f154UL, 0x67023355UL, 0x3ebc7557UL,
-    0x09d6b756UL, 0x8cc0f853UL, 0xbbaa3a52UL, 0xe2147c50UL, 0xd57ebe51UL,
-    0xe839e25aUL, 0xdf53205bUL, 0x86ed6659UL, 0xb187a458UL, 0x3491eb5dUL,
-    0x03fb295cUL, 0x5a456f5eUL, 0x6d2fad5fUL, 0x801b35e1UL, 0xb771f7e0UL,
-    0xeecfb1e2UL, 0xd9a573e3UL, 0x5cb33ce6UL, 0x6bd9fee7UL, 0x3267b8e5UL,
-    0x050d7ae4UL, 0x384a26efUL, 0x0f20e4eeUL, 0x569ea2ecUL, 0x61f460edUL,
-    0xe4e22fe8UL, 0xd388ede9UL, 0x8a36abebUL, 0xbd5c69eaUL, 0xf0b813fdUL,
-    0xc7d2d1fcUL, 0x9e6c97feUL, 0xa90655ffUL, 0x2c101afaUL, 0x1b7ad8fbUL,
-    0x42c49ef9UL, 0x75ae5cf8UL, 0x48e900f3UL, 0x7f83c2f2UL, 0x263d84f0UL,
-    0x115746f1UL, 0x944109f4UL, 0xa32bcbf5UL, 0xfa958df7UL, 0xcdff4ff6UL,
-    0x605d78d9UL, 0x5737bad8UL, 0x0e89fcdaUL, 0x39e33edbUL, 0xbcf571deUL,
-    0x8b9fb3dfUL, 0xd221f5ddUL, 0xe54b37dcUL, 0xd80c6bd7UL, 0xef66a9d6UL,
-    0xb6d8efd4UL, 0x81b22dd5UL, 0x04a462d0UL, 0x33cea0d1UL, 0x6a70e6d3UL,
-    0x5d1a24d2UL, 0x10fe5ec5UL, 0x27949cc4UL, 0x7e2adac6UL, 0x494018c7UL,
-    0xcc5657c2UL, 0xfb3c95c3UL, 0xa282d3c1UL, 0x95e811c0UL, 0xa8af4dcbUL,
-    0x9fc58fcaUL, 0xc67bc9c8UL, 0xf1110bc9UL, 0x740744ccUL, 0x436d86cdUL,
-    0x1ad3c0cfUL, 0x2db902ceUL, 0x4096af91UL, 0x77fc6d90UL, 0x2e422b92UL,
-    0x1928e993UL, 0x9c3ea696UL, 0xab546497UL, 0xf2ea2295UL, 0xc580e094UL,
-    0xf8c7bc9fUL, 0xcfad7e9eUL, 0x9613389cUL, 0xa179fa9dUL, 0x246fb598UL,
-    0x13057799UL, 0x4abb319bUL, 0x7dd1f39aUL, 0x3035898dUL, 0x075f4b8cUL,
-    0x5ee10d8eUL, 0x698bcf8fUL, 0xec9d808aUL, 0xdbf7428bUL, 0x82490489UL,
-    0xb523c688UL, 0x88649a83UL, 0xbf0e5882UL, 0xe6b01e80UL, 0xd1dadc81UL,
-    0x54cc9384UL, 0x63a65185UL, 0x3a181787UL, 0x0d72d586UL, 0xa0d0e2a9UL,
-    0x97ba20a8UL, 0xce0466aaUL, 0xf96ea4abUL, 0x7c78ebaeUL, 0x4b1229afUL,
-    0x12ac6fadUL, 0x25c6adacUL, 0x1881f1a7UL, 0x2feb33a6UL, 0x765575a4UL,
-    0x413fb7a5UL, 0xc429f8a0UL, 0xf3433aa1UL, 0xaafd7ca3UL, 0x9d97bea2UL,
-    0xd073c4b5UL, 0xe71906b4UL, 0xbea740b6UL, 0x89cd82b7UL, 0x0cdbcdb2UL,
-    0x3bb10fb3UL, 0x620f49b1UL, 0x55658bb0UL, 0x6822d7bbUL, 0x5f4815baUL,
-    0x06f653b8UL, 0x319c91b9UL, 0xb48adebcUL, 0x83e01cbdUL, 0xda5e5abfUL,
-    0xed3498beUL
-  },
-  {
-    0x00000000UL, 0x6567bcb8UL, 0x8bc809aaUL, 0xeeafb512UL, 0x5797628fUL,
-    0x32f0de37UL, 0xdc5f6b25UL, 0xb938d79dUL, 0xef28b4c5UL, 0x8a4f087dUL,
-    0x64e0bd6fUL, 0x018701d7UL, 0xb8bfd64aUL, 0xddd86af2UL, 0x3377dfe0UL,
-    0x56106358UL, 0x9f571950UL, 0xfa30a5e8UL, 0x149f10faUL, 0x71f8ac42UL,
-    0xc8c07bdfUL, 0xada7c767UL, 0x43087275UL, 0x266fcecdUL, 0x707fad95UL,
-    0x1518112dUL, 0xfbb7a43fUL, 0x9ed01887UL, 0x27e8cf1aUL, 0x428f73a2UL,
-    0xac20c6b0UL, 0xc9477a08UL, 0x3eaf32a0UL, 0x5bc88e18UL, 0xb5673b0aUL,
-    0xd00087b2UL, 0x6938502fUL, 0x0c5fec97UL, 0xe2f05985UL, 0x8797e53dUL,
-    0xd1878665UL, 0xb4e03addUL, 0x5a4f8fcfUL, 0x3f283377UL, 0x8610e4eaUL,
-    0xe3775852UL, 0x0dd8ed40UL, 0x68bf51f8UL, 0xa1f82bf0UL, 0xc49f9748UL,
-    0x2a30225aUL, 0x4f579ee2UL, 0xf66f497fUL, 0x9308f5c7UL, 0x7da740d5UL,
-    0x18c0fc6dUL, 0x4ed09f35UL, 0x2bb7238dUL, 0xc518969fUL, 0xa07f2a27UL,
-    0x1947fdbaUL, 0x7c204102UL, 0x928ff410UL, 0xf7e848a8UL, 0x3d58149bUL,
-    0x583fa823UL, 0xb6901d31UL, 0xd3f7a189UL, 0x6acf7614UL, 0x0fa8caacUL,
-    0xe1077fbeUL, 0x8460c306UL, 0xd270a05eUL, 0xb7171ce6UL, 0x59b8a9f4UL,
-    0x3cdf154cUL, 0x85e7c2d1UL, 0xe0807e69UL, 0x0e2fcb7bUL, 0x6b4877c3UL,
-    0xa20f0dcbUL, 0xc768b173UL, 0x29c70461UL, 0x4ca0b8d9UL, 0xf5986f44UL,
-    0x90ffd3fcUL, 0x7e5066eeUL, 0x1b37da56UL, 0x4d27b90eUL, 0x284005b6UL,
-    0xc6efb0a4UL, 0xa3880c1cUL, 0x1ab0db81UL, 0x7fd76739UL, 0x9178d22bUL,
-    0xf41f6e93UL, 0x03f7263bUL, 0x66909a83UL, 0x883f2f91UL, 0xed589329UL,
-    0x546044b4UL, 0x3107f80cUL, 0xdfa84d1eUL, 0xbacff1a6UL, 0xecdf92feUL,
-    0x89b82e46UL, 0x67179b54UL, 0x027027ecUL, 0xbb48f071UL, 0xde2f4cc9UL,
-    0x3080f9dbUL, 0x55e74563UL, 0x9ca03f6bUL, 0xf9c783d3UL, 0x176836c1UL,
-    0x720f8a79UL, 0xcb375de4UL, 0xae50e15cUL, 0x40ff544eUL, 0x2598e8f6UL,
-    0x73888baeUL, 0x16ef3716UL, 0xf8408204UL, 0x9d273ebcUL, 0x241fe921UL,
-    0x41785599UL, 0xafd7e08bUL, 0xcab05c33UL, 0x3bb659edUL, 0x5ed1e555UL,
-    0xb07e5047UL, 0xd519ecffUL, 0x6c213b62UL, 0x094687daUL, 0xe7e932c8UL,
-    0x828e8e70UL, 0xd49eed28UL, 0xb1f95190UL, 0x5f56e482UL, 0x3a31583aUL,
-    0x83098fa7UL, 0xe66e331fUL, 0x08c1860dUL, 0x6da63ab5UL, 0xa4e140bdUL,
-    0xc186fc05UL, 0x2f294917UL, 0x4a4ef5afUL, 0xf3762232UL, 0x96119e8aUL,
-    0x78be2b98UL, 0x1dd99720UL, 0x4bc9f478UL, 0x2eae48c0UL, 0xc001fdd2UL,
-    0xa566416aUL, 0x1c5e96f7UL, 0x79392a4fUL, 0x97969f5dUL, 0xf2f123e5UL,
-    0x05196b4dUL, 0x607ed7f5UL, 0x8ed162e7UL, 0xebb6de5fUL, 0x528e09c2UL,
-    0x37e9b57aUL, 0xd9460068UL, 0xbc21bcd0UL, 0xea31df88UL, 0x8f566330UL,
-    0x61f9d622UL, 0x049e6a9aUL, 0xbda6bd07UL, 0xd8c101bfUL, 0x366eb4adUL,
-    0x53090815UL, 0x9a4e721dUL, 0xff29cea5UL, 0x11867bb7UL, 0x74e1c70fUL,
-    0xcdd91092UL, 0xa8beac2aUL, 0x46111938UL, 0x2376a580UL, 0x7566c6d8UL,
-    0x10017a60UL, 0xfeaecf72UL, 0x9bc973caUL, 0x22f1a457UL, 0x479618efUL,
-    0xa939adfdUL, 0xcc5e1145UL, 0x06ee4d76UL, 0x6389f1ceUL, 0x8d2644dcUL,
-    0xe841f864UL, 0x51792ff9UL, 0x341e9341UL, 0xdab12653UL, 0xbfd69aebUL,
-    0xe9c6f9b3UL, 0x8ca1450bUL, 0x620ef019UL, 0x07694ca1UL, 0xbe519b3cUL,
-    0xdb362784UL, 0x35999296UL, 0x50fe2e2eUL, 0x99b95426UL, 0xfcdee89eUL,
-    0x12715d8cUL, 0x7716e134UL, 0xce2e36a9UL, 0xab498a11UL, 0x45e63f03UL,
-    0x208183bbUL, 0x7691e0e3UL, 0x13f65c5bUL, 0xfd59e949UL, 0x983e55f1UL,
-    0x2106826cUL, 0x44613ed4UL, 0xaace8bc6UL, 0xcfa9377eUL, 0x38417fd6UL,
-    0x5d26c36eUL, 0xb389767cUL, 0xd6eecac4UL, 0x6fd61d59UL, 0x0ab1a1e1UL,
-    0xe41e14f3UL, 0x8179a84bUL, 0xd769cb13UL, 0xb20e77abUL, 0x5ca1c2b9UL,
-    0x39c67e01UL, 0x80fea99cUL, 0xe5991524UL, 0x0b36a036UL, 0x6e511c8eUL,
-    0xa7166686UL, 0xc271da3eUL, 0x2cde6f2cUL, 0x49b9d394UL, 0xf0810409UL,
-    0x95e6b8b1UL, 0x7b490da3UL, 0x1e2eb11bUL, 0x483ed243UL, 0x2d596efbUL,
-    0xc3f6dbe9UL, 0xa6916751UL, 0x1fa9b0ccUL, 0x7ace0c74UL, 0x9461b966UL,
-    0xf10605deUL
-#endif
-  }
-};
diff --git a/src/png/zlib/deflate.c b/src/png/zlib/deflate.c
deleted file mode 100644
index 1ec761448..000000000
--- a/src/png/zlib/deflate.c
+++ /dev/null
@@ -1,2163 +0,0 @@
-/* deflate.c -- compress data using the deflation algorithm
- * Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/*
- *  ALGORITHM
- *
- *      The "deflation" process depends on being able to identify portions
- *      of the input text which are identical to earlier input (within a
- *      sliding window trailing behind the input currently being processed).
- *
- *      The most straightforward technique turns out to be the fastest for
- *      most input files: try all possible matches and select the longest.
- *      The key feature of this algorithm is that insertions into the string
- *      dictionary are very simple and thus fast, and deletions are avoided
- *      completely. Insertions are performed at each input character, whereas
- *      string matches are performed only when the previous match ends. So it
- *      is preferable to spend more time in matches to allow very fast string
- *      insertions and avoid deletions. The matching algorithm for small
- *      strings is inspired from that of Rabin & Karp. A brute force approach
- *      is used to find longer strings when a small match has been found.
- *      A similar algorithm is used in comic (by Jan-Mark Wams) and freeze
- *      (by Leonid Broukhis).
- *         A previous version of this file used a more sophisticated algorithm
- *      (by Fiala and Greene) which is guaranteed to run in linear amortized
- *      time, but has a larger average cost, uses more memory and is patented.
- *      However the F&G algorithm may be faster for some highly redundant
- *      files if the parameter max_chain_length (described below) is too large.
- *
- *  ACKNOWLEDGEMENTS
- *
- *      The idea of lazy evaluation of matches is due to Jan-Mark Wams, and
- *      I found it in 'freeze' written by Leonid Broukhis.
- *      Thanks to many people for bug reports and testing.
- *
- *  REFERENCES
- *
- *      Deutsch, L.P.,"DEFLATE Compressed Data Format Specification".
- *      Available in http://tools.ietf.org/html/rfc1951
- *
- *      A description of the Rabin and Karp algorithm is given in the book
- *         "Algorithms" by R. Sedgewick, Addison-Wesley, p252.
- *
- *      Fiala,E.R., and Greene,D.H.
- *         Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595
- *
- */
-
-/* @(#) $Id$ */
-
-#include "deflate.h"
-
-const char deflate_copyright[] =
-   " deflate 1.2.11 Copyright 1995-2017 Jean-loup Gailly and Mark Adler ";
-/*
-  If you use the zlib library in a product, an acknowledgment is welcome
-  in the documentation of your product. If for some reason you cannot
-  include such an acknowledgment, I would appreciate that you keep this
-  copyright string in the executable of your product.
- */
-
-/* ===========================================================================
- *  Function prototypes.
- */
-typedef enum {
-    need_more,      /* block not completed, need more input or more output */
-    block_done,     /* block flush performed */
-    finish_started, /* finish started, need only more output at next deflate */
-    finish_done     /* finish done, accept no more input or output */
-} block_state;
-
-typedef block_state (*compress_func) OF((deflate_state *s, int flush));
-/* Compression function. Returns the block state after the call. */
-
-local int deflateStateCheck      OF((z_streamp strm));
-local void slide_hash     OF((deflate_state *s));
-local void fill_window    OF((deflate_state *s));
-local block_state deflate_stored OF((deflate_state *s, int flush));
-local block_state deflate_fast   OF((deflate_state *s, int flush));
-#ifndef FASTEST
-local block_state deflate_slow   OF((deflate_state *s, int flush));
-#endif
-local block_state deflate_rle    OF((deflate_state *s, int flush));
-local block_state deflate_huff   OF((deflate_state *s, int flush));
-local void lm_init        OF((deflate_state *s));
-local void putShortMSB    OF((deflate_state *s, uInt b));
-local void flush_pending  OF((z_streamp strm));
-local unsigned read_buf   OF((z_streamp strm, Bytef *buf, unsigned size));
-#ifdef ASMV
-#  pragma message("Assembler code may have bugs -- use at your own risk")
-      void match_init OF((void)); /* asm code initialization */
-      uInt longest_match  OF((deflate_state *s, IPos cur_match));
-#else
-local uInt longest_match  OF((deflate_state *s, IPos cur_match));
-#endif
-
-#ifdef ZLIB_DEBUG
-local  void check_match OF((deflate_state *s, IPos start, IPos match,
-                            int length));
-#endif
-
-/* ===========================================================================
- * Local data
- */
-
-#define NIL 0
-/* Tail of hash chains */
-
-#ifndef TOO_FAR
-#  define TOO_FAR 4096
-#endif
-/* Matches of length 3 are discarded if their distance exceeds TOO_FAR */
-
-/* Values for max_lazy_match, good_match and max_chain_length, depending on
- * the desired pack level (0..9). The values given below have been tuned to
- * exclude worst case performance for pathological files. Better values may be
- * found for specific files.
- */
-typedef struct config_s {
-   ush good_length; /* reduce lazy search above this match length */
-   ush max_lazy;    /* do not perform lazy search above this match length */
-   ush nice_length; /* quit search above this match length */
-   ush max_chain;
-   compress_func func;
-} config;
-
-#ifdef FASTEST
-local const config configuration_table[2] = {
-/*      good lazy nice chain */
-/* 0 */ {0,    0,  0,    0, deflate_stored},  /* store only */
-/* 1 */ {4,    4,  8,    4, deflate_fast}}; /* max speed, no lazy matches */
-#else
-local const config configuration_table[10] = {
-/*      good lazy nice chain */
-/* 0 */ {0,    0,  0,    0, deflate_stored},  /* store only */
-/* 1 */ {4,    4,  8,    4, deflate_fast}, /* max speed, no lazy matches */
-/* 2 */ {4,    5, 16,    8, deflate_fast},
-/* 3 */ {4,    6, 32,   32, deflate_fast},
-
-/* 4 */ {4,    4, 16,   16, deflate_slow},  /* lazy matches */
-/* 5 */ {8,   16, 32,   32, deflate_slow},
-/* 6 */ {8,   16, 128, 128, deflate_slow},
-/* 7 */ {8,   32, 128, 256, deflate_slow},
-/* 8 */ {32, 128, 258, 1024, deflate_slow},
-/* 9 */ {32, 258, 258, 4096, deflate_slow}}; /* max compression */
-#endif
-
-/* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4
- * For deflate_fast() (levels <= 3) good is ignored and lazy has a different
- * meaning.
- */
-
-/* rank Z_BLOCK between Z_NO_FLUSH and Z_PARTIAL_FLUSH */
-#define RANK(f) (((f) * 2) - ((f) > 4 ? 9 : 0))
-
-/* ===========================================================================
- * Update a hash value with the given input byte
- * IN  assertion: all calls to UPDATE_HASH are made with consecutive input
- *    characters, so that a running hash key can be computed from the previous
- *    key instead of complete recalculation each time.
- */
-#define UPDATE_HASH(s,h,c) (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask)
-
-
-/* ===========================================================================
- * Insert string str in the dictionary and set match_head to the previous head
- * of the hash chain (the most recent string with same hash key). Return
- * the previous length of the hash chain.
- * If this file is compiled with -DFASTEST, the compression level is forced
- * to 1, and no hash chains are maintained.
- * IN  assertion: all calls to INSERT_STRING are made with consecutive input
- *    characters and the first MIN_MATCH bytes of str are valid (except for
- *    the last MIN_MATCH-1 bytes of the input file).
- */
-#ifdef FASTEST
-#define INSERT_STRING(s, str, match_head) \
-   (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
-    match_head = s->head[s->ins_h], \
-    s->head[s->ins_h] = (Pos)(str))
-#else
-#define INSERT_STRING(s, str, match_head) \
-   (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
-    match_head = s->prev[(str) & s->w_mask] = s->head[s->ins_h], \
-    s->head[s->ins_h] = (Pos)(str))
-#endif
-
-/* ===========================================================================
- * Initialize the hash table (avoiding 64K overflow for 16 bit systems).
- * prev[] will be initialized on the fly.
- */
-#define CLEAR_HASH(s) \
-    s->head[s->hash_size-1] = NIL; \
-    zmemzero((Bytef *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head));
-
-/* ===========================================================================
- * Slide the hash table when sliding the window down (could be avoided with 32
- * bit values at the expense of memory usage). We slide even when level == 0 to
- * keep the hash table consistent if we switch back to level > 0 later.
- */
-local void slide_hash(s)
-    deflate_state *s;
-{
-    unsigned n, m;
-    Posf *p;
-    uInt wsize = s->w_size;
-
-    n = s->hash_size;
-    p = &s->head[n];
-    do {
-        m = *--p;
-        *p = (Pos)(m >= wsize ? m - wsize : NIL);
-    } while (--n);
-    n = wsize;
-#ifndef FASTEST
-    p = &s->prev[n];
-    do {
-        m = *--p;
-        *p = (Pos)(m >= wsize ? m - wsize : NIL);
-        /* If n is not on any hash chain, prev[n] is garbage but
-         * its value will never be used.
-         */
-    } while (--n);
-#endif
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateInit_(strm, level, version, stream_size)
-    z_streamp strm;
-    int level;
-    const char *version;
-    int stream_size;
-{
-    return deflateInit2_(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL,
-                         Z_DEFAULT_STRATEGY, version, stream_size);
-    /* To do: ignore strm->next_in if we use it as window */
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
-                  version, stream_size)
-    z_streamp strm;
-    int  level;
-    int  method;
-    int  windowBits;
-    int  memLevel;
-    int  strategy;
-    const char *version;
-    int stream_size;
-{
-    deflate_state *s;
-    int wrap = 1;
-    static const char my_version[] = ZLIB_VERSION;
-
-    ushf *overlay;
-    /* We overlay pending_buf and d_buf+l_buf. This works since the average
-     * output size for (length,distance) codes is <= 24 bits.
-     */
-
-    if (version == Z_NULL || version[0] != my_version[0] ||
-        stream_size != sizeof(z_stream)) {
-        return Z_VERSION_ERROR;
-    }
-    if (strm == Z_NULL) return Z_STREAM_ERROR;
-
-    strm->msg = Z_NULL;
-    if (strm->zalloc == (alloc_func)0) {
-#ifdef Z_SOLO
-        return Z_STREAM_ERROR;
-#else
-        strm->zalloc = zcalloc;
-        strm->opaque = (voidpf)0;
-#endif
-    }
-    if (strm->zfree == (free_func)0)
-#ifdef Z_SOLO
-        return Z_STREAM_ERROR;
-#else
-        strm->zfree = zcfree;
-#endif
-
-#ifdef FASTEST
-    if (level != 0) level = 1;
-#else
-    if (level == Z_DEFAULT_COMPRESSION) level = 6;
-#endif
-
-    if (windowBits < 0) { /* suppress zlib wrapper */
-        wrap = 0;
-        windowBits = -windowBits;
-    }
-#ifdef GZIP
-    else if (windowBits > 15) {
-        wrap = 2;       /* write gzip wrapper instead */
-        windowBits -= 16;
-    }
-#endif
-    if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED ||
-        windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
-        strategy < 0 || strategy > Z_FIXED || (windowBits == 8 && wrap != 1)) {
-        return Z_STREAM_ERROR;
-    }
-    if (windowBits == 8) windowBits = 9;  /* until 256-byte window bug fixed */
-    s = (deflate_state *) ZALLOC(strm, 1, sizeof(deflate_state));
-    if (s == Z_NULL) return Z_MEM_ERROR;
-    strm->state = (struct internal_state FAR *)s;
-    s->strm = strm;
-    s->status = INIT_STATE;     /* to pass state test in deflateReset() */
-
-    s->wrap = wrap;
-    s->gzhead = Z_NULL;
-    s->w_bits = (uInt)windowBits;
-    s->w_size = 1 << s->w_bits;
-    s->w_mask = s->w_size - 1;
-
-    s->hash_bits = (uInt)memLevel + 7;
-    s->hash_size = 1 << s->hash_bits;
-    s->hash_mask = s->hash_size - 1;
-    s->hash_shift =  ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH);
-
-    s->window = (Bytef *) ZALLOC(strm, s->w_size, 2*sizeof(Byte));
-    s->prev   = (Posf *)  ZALLOC(strm, s->w_size, sizeof(Pos));
-    s->head   = (Posf *)  ZALLOC(strm, s->hash_size, sizeof(Pos));
-
-    s->high_water = 0;      /* nothing written to s->window yet */
-
-    s->lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */
-
-    overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2);
-    s->pending_buf = (uchf *) overlay;
-    s->pending_buf_size = (ulg)s->lit_bufsize * (sizeof(ush)+2L);
-
-    if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL ||
-        s->pending_buf == Z_NULL) {
-        s->status = FINISH_STATE;
-        strm->msg = ERR_MSG(Z_MEM_ERROR);
-        deflateEnd (strm);
-        return Z_MEM_ERROR;
-    }
-    s->d_buf = overlay + s->lit_bufsize/sizeof(ush);
-    s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize;
-
-    s->level = level;
-    s->strategy = strategy;
-    s->method = (Byte)method;
-
-    return deflateReset(strm);
-}
-
-/* =========================================================================
- * Check for a valid deflate stream state. Return 0 if ok, 1 if not.
- */
-local int deflateStateCheck (strm)
-    z_streamp strm;
-{
-    deflate_state *s;
-    if (strm == Z_NULL ||
-        strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0)
-        return 1;
-    s = strm->state;
-    if (s == Z_NULL || s->strm != strm || (s->status != INIT_STATE &&
-#ifdef GZIP
-                                           s->status != GZIP_STATE &&
-#endif
-                                           s->status != EXTRA_STATE &&
-                                           s->status != NAME_STATE &&
-                                           s->status != COMMENT_STATE &&
-                                           s->status != HCRC_STATE &&
-                                           s->status != BUSY_STATE &&
-                                           s->status != FINISH_STATE))
-        return 1;
-    return 0;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateSetDictionary (strm, dictionary, dictLength)
-    z_streamp strm;
-    const Bytef *dictionary;
-    uInt  dictLength;
-{
-    deflate_state *s;
-    uInt str, n;
-    int wrap;
-    unsigned avail;
-    z_const unsigned char *next;
-
-    if (deflateStateCheck(strm) || dictionary == Z_NULL)
-        return Z_STREAM_ERROR;
-    s = strm->state;
-    wrap = s->wrap;
-    if (wrap == 2 || (wrap == 1 && s->status != INIT_STATE) || s->lookahead)
-        return Z_STREAM_ERROR;
-
-    /* when using zlib wrappers, compute Adler-32 for provided dictionary */
-    if (wrap == 1)
-        strm->adler = adler32(strm->adler, dictionary, dictLength);
-    s->wrap = 0;                    /* avoid computing Adler-32 in read_buf */
-
-    /* if dictionary would fill window, just replace the history */
-    if (dictLength >= s->w_size) {
-        if (wrap == 0) {            /* already empty otherwise */
-            CLEAR_HASH(s);
-            s->strstart = 0;
-            s->block_start = 0L;
-            s->insert = 0;
-        }
-        dictionary += dictLength - s->w_size;  /* use the tail */
-        dictLength = s->w_size;
-    }
-
-    /* insert dictionary into window and hash */
-    avail = strm->avail_in;
-    next = strm->next_in;
-    strm->avail_in = dictLength;
-    strm->next_in = (z_const Bytef *)dictionary;
-    fill_window(s);
-    while (s->lookahead >= MIN_MATCH) {
-        str = s->strstart;
-        n = s->lookahead - (MIN_MATCH-1);
-        do {
-            UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]);
-#ifndef FASTEST
-            s->prev[str & s->w_mask] = s->head[s->ins_h];
-#endif
-            s->head[s->ins_h] = (Pos)str;
-            str++;
-        } while (--n);
-        s->strstart = str;
-        s->lookahead = MIN_MATCH-1;
-        fill_window(s);
-    }
-    s->strstart += s->lookahead;
-    s->block_start = (long)s->strstart;
-    s->insert = s->lookahead;
-    s->lookahead = 0;
-    s->match_length = s->prev_length = MIN_MATCH-1;
-    s->match_available = 0;
-    strm->next_in = next;
-    strm->avail_in = avail;
-    s->wrap = wrap;
-    return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateGetDictionary (strm, dictionary, dictLength)
-    z_streamp strm;
-    Bytef *dictionary;
-    uInt  *dictLength;
-{
-    deflate_state *s;
-    uInt len;
-
-    if (deflateStateCheck(strm))
-        return Z_STREAM_ERROR;
-    s = strm->state;
-    len = s->strstart + s->lookahead;
-    if (len > s->w_size)
-        len = s->w_size;
-    if (dictionary != Z_NULL && len)
-        zmemcpy(dictionary, s->window + s->strstart + s->lookahead - len, len);
-    if (dictLength != Z_NULL)
-        *dictLength = len;
-    return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateResetKeep (strm)
-    z_streamp strm;
-{
-    deflate_state *s;
-
-    if (deflateStateCheck(strm)) {
-        return Z_STREAM_ERROR;
-    }
-
-    strm->total_in = strm->total_out = 0;
-    strm->msg = Z_NULL; /* use zfree if we ever allocate msg dynamically */
-    strm->data_type = Z_UNKNOWN;
-
-    s = (deflate_state *)strm->state;
-    s->pending = 0;
-    s->pending_out = s->pending_buf;
-
-    if (s->wrap < 0) {
-        s->wrap = -s->wrap; /* was made negative by deflate(..., Z_FINISH); */
-    }
-    s->status =
-#ifdef GZIP
-        s->wrap == 2 ? GZIP_STATE :
-#endif
-        s->wrap ? INIT_STATE : BUSY_STATE;
-    strm->adler =
-#ifdef GZIP
-        s->wrap == 2 ? crc32(0L, Z_NULL, 0) :
-#endif
-        adler32(0L, Z_NULL, 0);
-    s->last_flush = Z_NO_FLUSH;
-
-    _tr_init(s);
-
-    return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateReset (strm)
-    z_streamp strm;
-{
-    int ret;
-
-    ret = deflateResetKeep(strm);
-    if (ret == Z_OK)
-        lm_init(strm->state);
-    return ret;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateSetHeader (strm, head)
-    z_streamp strm;
-    gz_headerp head;
-{
-    if (deflateStateCheck(strm) || strm->state->wrap != 2)
-        return Z_STREAM_ERROR;
-    strm->state->gzhead = head;
-    return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflatePending (strm, pending, bits)
-    unsigned *pending;
-    int *bits;
-    z_streamp strm;
-{
-    if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
-    if (pending != Z_NULL)
-        *pending = strm->state->pending;
-    if (bits != Z_NULL)
-        *bits = strm->state->bi_valid;
-    return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflatePrime (strm, bits, value)
-    z_streamp strm;
-    int bits;
-    int value;
-{
-    deflate_state *s;
-    int put;
-
-    if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
-    s = strm->state;
-    if ((Bytef *)(s->d_buf) < s->pending_out + ((Buf_size + 7) >> 3))
-        return Z_BUF_ERROR;
-    do {
-        put = Buf_size - s->bi_valid;
-        if (put > bits)
-            put = bits;
-        s->bi_buf |= (ush)((value & ((1 << put) - 1)) << s->bi_valid);
-        s->bi_valid += put;
-        _tr_flush_bits(s);
-        value >>= put;
-        bits -= put;
-    } while (bits);
-    return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateParams(strm, level, strategy)
-    z_streamp strm;
-    int level;
-    int strategy;
-{
-    deflate_state *s;
-    compress_func func;
-
-    if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
-    s = strm->state;
-
-#ifdef FASTEST
-    if (level != 0) level = 1;
-#else
-    if (level == Z_DEFAULT_COMPRESSION) level = 6;
-#endif
-    if (level < 0 || level > 9 || strategy < 0 || strategy > Z_FIXED) {
-        return Z_STREAM_ERROR;
-    }
-    func = configuration_table[s->level].func;
-
-    if ((strategy != s->strategy || func != configuration_table[level].func) &&
-        s->high_water) {
-        /* Flush the last buffer: */
-        int err = deflate(strm, Z_BLOCK);
-        if (err == Z_STREAM_ERROR)
-            return err;
-        if (strm->avail_out == 0)
-            return Z_BUF_ERROR;
-    }
-    if (s->level != level) {
-        if (s->level == 0 && s->matches != 0) {
-            if (s->matches == 1)
-                slide_hash(s);
-            else
-                CLEAR_HASH(s);
-            s->matches = 0;
-        }
-        s->level = level;
-        s->max_lazy_match   = configuration_table[level].max_lazy;
-        s->good_match       = configuration_table[level].good_length;
-        s->nice_match       = configuration_table[level].nice_length;
-        s->max_chain_length = configuration_table[level].max_chain;
-    }
-    s->strategy = strategy;
-    return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateTune(strm, good_length, max_lazy, nice_length, max_chain)
-    z_streamp strm;
-    int good_length;
-    int max_lazy;
-    int nice_length;
-    int max_chain;
-{
-    deflate_state *s;
-
-    if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
-    s = strm->state;
-    s->good_match = (uInt)good_length;
-    s->max_lazy_match = (uInt)max_lazy;
-    s->nice_match = nice_length;
-    s->max_chain_length = (uInt)max_chain;
-    return Z_OK;
-}
-
-/* =========================================================================
- * For the default windowBits of 15 and memLevel of 8, this function returns
- * a close to exact, as well as small, upper bound on the compressed size.
- * They are coded as constants here for a reason--if the #define's are
- * changed, then this function needs to be changed as well.  The return
- * value for 15 and 8 only works for those exact settings.
- *
- * For any setting other than those defaults for windowBits and memLevel,
- * the value returned is a conservative worst case for the maximum expansion
- * resulting from using fixed blocks instead of stored blocks, which deflate
- * can emit on compressed data for some combinations of the parameters.
- *
- * This function could be more sophisticated to provide closer upper bounds for
- * every combination of windowBits and memLevel.  But even the conservative
- * upper bound of about 14% expansion does not seem onerous for output buffer
- * allocation.
- */
-uLong ZEXPORT deflateBound(strm, sourceLen)
-    z_streamp strm;
-    uLong sourceLen;
-{
-    deflate_state *s;
-    uLong complen, wraplen;
-
-    /* conservative upper bound for compressed data */
-    complen = sourceLen +
-              ((sourceLen + 7) >> 3) + ((sourceLen + 63) >> 6) + 5;
-
-    /* if can't get parameters, return conservative bound plus zlib wrapper */
-    if (deflateStateCheck(strm))
-        return complen + 6;
-
-    /* compute wrapper length */
-    s = strm->state;
-    switch (s->wrap) {
-    case 0:                                 /* raw deflate */
-        wraplen = 0;
-        break;
-    case 1:                                 /* zlib wrapper */
-        wraplen = 6 + (s->strstart ? 4 : 0);
-        break;
-#ifdef GZIP
-    case 2:                                 /* gzip wrapper */
-        wraplen = 18;
-        if (s->gzhead != Z_NULL) {          /* user-supplied gzip header */
-            Bytef *str;
-            if (s->gzhead->extra != Z_NULL)
-                wraplen += 2 + s->gzhead->extra_len;
-            str = s->gzhead->name;
-            if (str != Z_NULL)
-                do {
-                    wraplen++;
-                } while (*str++);
-            str = s->gzhead->comment;
-            if (str != Z_NULL)
-                do {
-                    wraplen++;
-                } while (*str++);
-            if (s->gzhead->hcrc)
-                wraplen += 2;
-        }
-        break;
-#endif
-    default:                                /* for compiler happiness */
-        wraplen = 6;
-    }
-
-    /* if not default parameters, return conservative bound */
-    if (s->w_bits != 15 || s->hash_bits != 8 + 7)
-        return complen + wraplen;
-
-    /* default settings: return tight bound for that case */
-    return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
-           (sourceLen >> 25) + 13 - 6 + wraplen;
-}
-
-/* =========================================================================
- * Put a short in the pending buffer. The 16-bit value is put in MSB order.
- * IN assertion: the stream state is correct and there is enough room in
- * pending_buf.
- */
-local void putShortMSB (s, b)
-    deflate_state *s;
-    uInt b;
-{
-    put_byte(s, (Byte)(b >> 8));
-    put_byte(s, (Byte)(b & 0xff));
-}
-
-/* =========================================================================
- * Flush as much pending output as possible. All deflate() output, except for
- * some deflate_stored() output, goes through this function so some
- * applications may wish to modify it to avoid allocating a large
- * strm->next_out buffer and copying into it. (See also read_buf()).
- */
-local void flush_pending(strm)
-    z_streamp strm;
-{
-    unsigned len;
-    deflate_state *s = strm->state;
-
-    _tr_flush_bits(s);
-    len = s->pending;
-    if (len > strm->avail_out) len = strm->avail_out;
-    if (len == 0) return;
-
-    zmemcpy(strm->next_out, s->pending_out, len);
-    strm->next_out  += len;
-    s->pending_out  += len;
-    strm->total_out += len;
-    strm->avail_out -= len;
-    s->pending      -= len;
-    if (s->pending == 0) {
-        s->pending_out = s->pending_buf;
-    }
-}
-
-/* ===========================================================================
- * Update the header CRC with the bytes s->pending_buf[beg..s->pending - 1].
- */
-#define HCRC_UPDATE(beg) \
-    do { \
-        if (s->gzhead->hcrc && s->pending > (beg)) \
-            strm->adler = crc32(strm->adler, s->pending_buf + (beg), \
-                                s->pending - (beg)); \
-    } while (0)
-
-/* ========================================================================= */
-int ZEXPORT deflate (strm, flush)
-    z_streamp strm;
-    int flush;
-{
-    int old_flush; /* value of flush param for previous deflate call */
-    deflate_state *s;
-
-    if (deflateStateCheck(strm) || flush > Z_BLOCK || flush < 0) {
-        return Z_STREAM_ERROR;
-    }
-    s = strm->state;
-
-    if (strm->next_out == Z_NULL ||
-        (strm->avail_in != 0 && strm->next_in == Z_NULL) ||
-        (s->status == FINISH_STATE && flush != Z_FINISH)) {
-        ERR_RETURN(strm, Z_STREAM_ERROR);
-    }
-    if (strm->avail_out == 0) ERR_RETURN(strm, Z_BUF_ERROR);
-
-    old_flush = s->last_flush;
-    s->last_flush = flush;
-
-    /* Flush as much pending output as possible */
-    if (s->pending != 0) {
-        flush_pending(strm);
-        if (strm->avail_out == 0) {
-            /* Since avail_out is 0, deflate will be called again with
-             * more output space, but possibly with both pending and
-             * avail_in equal to zero. There won't be anything to do,
-             * but this is not an error situation so make sure we
-             * return OK instead of BUF_ERROR at next call of deflate:
-             */
-            s->last_flush = -1;
-            return Z_OK;
-        }
-
-    /* Make sure there is something to do and avoid duplicate consecutive
-     * flushes. For repeated and useless calls with Z_FINISH, we keep
-     * returning Z_STREAM_END instead of Z_BUF_ERROR.
-     */
-    } else if (strm->avail_in == 0 && RANK(flush) <= RANK(old_flush) &&
-               flush != Z_FINISH) {
-        ERR_RETURN(strm, Z_BUF_ERROR);
-    }
-
-    /* User must not provide more input after the first FINISH: */
-    if (s->status == FINISH_STATE && strm->avail_in != 0) {
-        ERR_RETURN(strm, Z_BUF_ERROR);
-    }
-
-    /* Write the header */
-    if (s->status == INIT_STATE) {
-        /* zlib header */
-        uInt header = (Z_DEFLATED + ((s->w_bits-8)<<4)) << 8;
-        uInt level_flags;
-
-        if (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2)
-            level_flags = 0;
-        else if (s->level < 6)
-            level_flags = 1;
-        else if (s->level == 6)
-            level_flags = 2;
-        else
-            level_flags = 3;
-        header |= (level_flags << 6);
-        if (s->strstart != 0) header |= PRESET_DICT;
-        header += 31 - (header % 31);
-
-        putShortMSB(s, header);
-
-        /* Save the adler32 of the preset dictionary: */
-        if (s->strstart != 0) {
-            putShortMSB(s, (uInt)(strm->adler >> 16));
-            putShortMSB(s, (uInt)(strm->adler & 0xffff));
-        }
-        strm->adler = adler32(0L, Z_NULL, 0);
-        s->status = BUSY_STATE;
-
-        /* Compression must start with an empty pending buffer */
-        flush_pending(strm);
-        if (s->pending != 0) {
-            s->last_flush = -1;
-            return Z_OK;
-        }
-    }
-#ifdef GZIP
-    if (s->status == GZIP_STATE) {
-        /* gzip header */
-        strm->adler = crc32(0L, Z_NULL, 0);
-        put_byte(s, 31);
-        put_byte(s, 139);
-        put_byte(s, 8);
-        if (s->gzhead == Z_NULL) {
-            put_byte(s, 0);
-            put_byte(s, 0);
-            put_byte(s, 0);
-            put_byte(s, 0);
-            put_byte(s, 0);
-            put_byte(s, s->level == 9 ? 2 :
-                     (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
-                      4 : 0));
-            put_byte(s, OS_CODE);
-            s->status = BUSY_STATE;
-
-            /* Compression must start with an empty pending buffer */
-            flush_pending(strm);
-            if (s->pending != 0) {
-                s->last_flush = -1;
-                return Z_OK;
-            }
-        }
-        else {
-            put_byte(s, (s->gzhead->text ? 1 : 0) +
-                     (s->gzhead->hcrc ? 2 : 0) +
-                     (s->gzhead->extra == Z_NULL ? 0 : 4) +
-                     (s->gzhead->name == Z_NULL ? 0 : 8) +
-                     (s->gzhead->comment == Z_NULL ? 0 : 16)
-                     );
-            put_byte(s, (Byte)(s->gzhead->time & 0xff));
-            put_byte(s, (Byte)((s->gzhead->time >> 8) & 0xff));
-            put_byte(s, (Byte)((s->gzhead->time >> 16) & 0xff));
-            put_byte(s, (Byte)((s->gzhead->time >> 24) & 0xff));
-            put_byte(s, s->level == 9 ? 2 :
-                     (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
-                      4 : 0));
-            put_byte(s, s->gzhead->os & 0xff);
-            if (s->gzhead->extra != Z_NULL) {
-                put_byte(s, s->gzhead->extra_len & 0xff);
-                put_byte(s, (s->gzhead->extra_len >> 8) & 0xff);
-            }
-            if (s->gzhead->hcrc)
-                strm->adler = crc32(strm->adler, s->pending_buf,
-                                    s->pending);
-            s->gzindex = 0;
-            s->status = EXTRA_STATE;
-        }
-    }
-    if (s->status == EXTRA_STATE) {
-        if (s->gzhead->extra != Z_NULL) {
-            ulg beg = s->pending;   /* start of bytes to update crc */
-            uInt left = (s->gzhead->extra_len & 0xffff) - s->gzindex;
-            while (s->pending + left > s->pending_buf_size) {
-                uInt copy = s->pending_buf_size - s->pending;
-                zmemcpy(s->pending_buf + s->pending,
-                        s->gzhead->extra + s->gzindex, copy);
-                s->pending = s->pending_buf_size;
-                HCRC_UPDATE(beg);
-                s->gzindex += copy;
-                flush_pending(strm);
-                if (s->pending != 0) {
-                    s->last_flush = -1;
-                    return Z_OK;
-                }
-                beg = 0;
-                left -= copy;
-            }
-            zmemcpy(s->pending_buf + s->pending,
-                    s->gzhead->extra + s->gzindex, left);
-            s->pending += left;
-            HCRC_UPDATE(beg);
-            s->gzindex = 0;
-        }
-        s->status = NAME_STATE;
-    }
-    if (s->status == NAME_STATE) {
-        if (s->gzhead->name != Z_NULL) {
-            ulg beg = s->pending;   /* start of bytes to update crc */
-            int val;
-            do {
-                if (s->pending == s->pending_buf_size) {
-                    HCRC_UPDATE(beg);
-                    flush_pending(strm);
-                    if (s->pending != 0) {
-                        s->last_flush = -1;
-                        return Z_OK;
-                    }
-                    beg = 0;
-                }
-                val = s->gzhead->name[s->gzindex++];
-                put_byte(s, val);
-            } while (val != 0);
-            HCRC_UPDATE(beg);
-            s->gzindex = 0;
-        }
-        s->status = COMMENT_STATE;
-    }
-    if (s->status == COMMENT_STATE) {
-        if (s->gzhead->comment != Z_NULL) {
-            ulg beg = s->pending;   /* start of bytes to update crc */
-            int val;
-            do {
-                if (s->pending == s->pending_buf_size) {
-                    HCRC_UPDATE(beg);
-                    flush_pending(strm);
-                    if (s->pending != 0) {
-                        s->last_flush = -1;
-                        return Z_OK;
-                    }
-                    beg = 0;
-                }
-                val = s->gzhead->comment[s->gzindex++];
-                put_byte(s, val);
-            } while (val != 0);
-            HCRC_UPDATE(beg);
-        }
-        s->status = HCRC_STATE;
-    }
-    if (s->status == HCRC_STATE) {
-        if (s->gzhead->hcrc) {
-            if (s->pending + 2 > s->pending_buf_size) {
-                flush_pending(strm);
-                if (s->pending != 0) {
-                    s->last_flush = -1;
-                    return Z_OK;
-                }
-            }
-            put_byte(s, (Byte)(strm->adler & 0xff));
-            put_byte(s, (Byte)((strm->adler >> 8) & 0xff));
-            strm->adler = crc32(0L, Z_NULL, 0);
-        }
-        s->status = BUSY_STATE;
-
-        /* Compression must start with an empty pending buffer */
-        flush_pending(strm);
-        if (s->pending != 0) {
-            s->last_flush = -1;
-            return Z_OK;
-        }
-    }
-#endif
-
-    /* Start a new block or continue the current one.
-     */
-    if (strm->avail_in != 0 || s->lookahead != 0 ||
-        (flush != Z_NO_FLUSH && s->status != FINISH_STATE)) {
-        block_state bstate;
-
-        bstate = s->level == 0 ? deflate_stored(s, flush) :
-                 s->strategy == Z_HUFFMAN_ONLY ? deflate_huff(s, flush) :
-                 s->strategy == Z_RLE ? deflate_rle(s, flush) :
-                 (*(configuration_table[s->level].func))(s, flush);
-
-        if (bstate == finish_started || bstate == finish_done) {
-            s->status = FINISH_STATE;
-        }
-        if (bstate == need_more || bstate == finish_started) {
-            if (strm->avail_out == 0) {
-                s->last_flush = -1; /* avoid BUF_ERROR next call, see above */
-            }
-            return Z_OK;
-            /* If flush != Z_NO_FLUSH && avail_out == 0, the next call
-             * of deflate should use the same flush parameter to make sure
-             * that the flush is complete. So we don't have to output an
-             * empty block here, this will be done at next call. This also
-             * ensures that for a very small output buffer, we emit at most
-             * one empty block.
-             */
-        }
-        if (bstate == block_done) {
-            if (flush == Z_PARTIAL_FLUSH) {
-                _tr_align(s);
-            } else if (flush != Z_BLOCK) { /* FULL_FLUSH or SYNC_FLUSH */
-                _tr_stored_block(s, (char*)0, 0L, 0);
-                /* For a full flush, this empty block will be recognized
-                 * as a special marker by inflate_sync().
-                 */
-                if (flush == Z_FULL_FLUSH) {
-                    CLEAR_HASH(s);             /* forget history */
-                    if (s->lookahead == 0) {
-                        s->strstart = 0;
-                        s->block_start = 0L;
-                        s->insert = 0;
-                    }
-                }
-            }
-            flush_pending(strm);
-            if (strm->avail_out == 0) {
-              s->last_flush = -1; /* avoid BUF_ERROR at next call, see above */
-              return Z_OK;
-            }
-        }
-    }
-
-    if (flush != Z_FINISH) return Z_OK;
-    if (s->wrap <= 0) return Z_STREAM_END;
-
-    /* Write the trailer */
-#ifdef GZIP
-    if (s->wrap == 2) {
-        put_byte(s, (Byte)(strm->adler & 0xff));
-        put_byte(s, (Byte)((strm->adler >> 8) & 0xff));
-        put_byte(s, (Byte)((strm->adler >> 16) & 0xff));
-        put_byte(s, (Byte)((strm->adler >> 24) & 0xff));
-        put_byte(s, (Byte)(strm->total_in & 0xff));
-        put_byte(s, (Byte)((strm->total_in >> 8) & 0xff));
-        put_byte(s, (Byte)((strm->total_in >> 16) & 0xff));
-        put_byte(s, (Byte)((strm->total_in >> 24) & 0xff));
-    }
-    else
-#endif
-    {
-        putShortMSB(s, (uInt)(strm->adler >> 16));
-        putShortMSB(s, (uInt)(strm->adler & 0xffff));
-    }
-    flush_pending(strm);
-    /* If avail_out is zero, the application will call deflate again
-     * to flush the rest.
-     */
-    if (s->wrap > 0) s->wrap = -s->wrap; /* write the trailer only once! */
-    return s->pending != 0 ? Z_OK : Z_STREAM_END;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateEnd (strm)
-    z_streamp strm;
-{
-    int status;
-
-    if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
-
-    status = strm->state->status;
-
-    /* Deallocate in reverse order of allocations: */
-    TRY_FREE(strm, strm->state->pending_buf);
-    TRY_FREE(strm, strm->state->head);
-    TRY_FREE(strm, strm->state->prev);
-    TRY_FREE(strm, strm->state->window);
-
-    ZFREE(strm, strm->state);
-    strm->state = Z_NULL;
-
-    return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK;
-}
-
-/* =========================================================================
- * Copy the source state to the destination state.
- * To simplify the source, this is not supported for 16-bit MSDOS (which
- * doesn't have enough memory anyway to duplicate compression states).
- */
-int ZEXPORT deflateCopy (dest, source)
-    z_streamp dest;
-    z_streamp source;
-{
-#ifdef MAXSEG_64K
-    return Z_STREAM_ERROR;
-#else
-    deflate_state *ds;
-    deflate_state *ss;
-    ushf *overlay;
-
-
-    if (deflateStateCheck(source) || dest == Z_NULL) {
-        return Z_STREAM_ERROR;
-    }
-
-    ss = source->state;
-
-    zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream));
-
-    ds = (deflate_state *) ZALLOC(dest, 1, sizeof(deflate_state));
-    if (ds == Z_NULL) return Z_MEM_ERROR;
-    dest->state = (struct internal_state FAR *) ds;
-    zmemcpy((voidpf)ds, (voidpf)ss, sizeof(deflate_state));
-    ds->strm = dest;
-
-    ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte));
-    ds->prev   = (Posf *)  ZALLOC(dest, ds->w_size, sizeof(Pos));
-    ds->head   = (Posf *)  ZALLOC(dest, ds->hash_size, sizeof(Pos));
-    overlay = (ushf *) ZALLOC(dest, ds->lit_bufsize, sizeof(ush)+2);
-    ds->pending_buf = (uchf *) overlay;
-
-    if (ds->window == Z_NULL || ds->prev == Z_NULL || ds->head == Z_NULL ||
-        ds->pending_buf == Z_NULL) {
-        deflateEnd (dest);
-        return Z_MEM_ERROR;
-    }
-    /* following zmemcpy do not work for 16-bit MSDOS */
-    zmemcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte));
-    zmemcpy((voidpf)ds->prev, (voidpf)ss->prev, ds->w_size * sizeof(Pos));
-    zmemcpy((voidpf)ds->head, (voidpf)ss->head, ds->hash_size * sizeof(Pos));
-    zmemcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size);
-
-    ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf);
-    ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush);
-    ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize;
-
-    ds->l_desc.dyn_tree = ds->dyn_ltree;
-    ds->d_desc.dyn_tree = ds->dyn_dtree;
-    ds->bl_desc.dyn_tree = ds->bl_tree;
-
-    return Z_OK;
-#endif /* MAXSEG_64K */
-}
-
-/* ===========================================================================
- * Read a new buffer from the current input stream, update the adler32
- * and total number of bytes read.  All deflate() input goes through
- * this function so some applications may wish to modify it to avoid
- * allocating a large strm->next_in buffer and copying from it.
- * (See also flush_pending()).
- */
-local unsigned read_buf(strm, buf, size)
-    z_streamp strm;
-    Bytef *buf;
-    unsigned size;
-{
-    unsigned len = strm->avail_in;
-
-    if (len > size) len = size;
-    if (len == 0) return 0;
-
-    strm->avail_in  -= len;
-
-    zmemcpy(buf, strm->next_in, len);
-    if (strm->state->wrap == 1) {
-        strm->adler = adler32(strm->adler, buf, len);
-    }
-#ifdef GZIP
-    else if (strm->state->wrap == 2) {
-        strm->adler = crc32(strm->adler, buf, len);
-    }
-#endif
-    strm->next_in  += len;
-    strm->total_in += len;
-
-    return len;
-}
-
-/* ===========================================================================
- * Initialize the "longest match" routines for a new zlib stream
- */
-local void lm_init (s)
-    deflate_state *s;
-{
-    s->window_size = (ulg)2L*s->w_size;
-
-    CLEAR_HASH(s);
-
-    /* Set the default configuration parameters:
-     */
-    s->max_lazy_match   = configuration_table[s->level].max_lazy;
-    s->good_match       = configuration_table[s->level].good_length;
-    s->nice_match       = configuration_table[s->level].nice_length;
-    s->max_chain_length = configuration_table[s->level].max_chain;
-
-    s->strstart = 0;
-    s->block_start = 0L;
-    s->lookahead = 0;
-    s->insert = 0;
-    s->match_length = s->prev_length = MIN_MATCH-1;
-    s->match_available = 0;
-    s->ins_h = 0;
-#ifndef FASTEST
-#ifdef ASMV
-    match_init(); /* initialize the asm code */
-#endif
-#endif
-}
-
-#ifndef FASTEST
-/* ===========================================================================
- * Set match_start to the longest match starting at the given string and
- * return its length. Matches shorter or equal to prev_length are discarded,
- * in which case the result is equal to prev_length and match_start is
- * garbage.
- * IN assertions: cur_match is the head of the hash chain for the current
- *   string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
- * OUT assertion: the match length is not greater than s->lookahead.
- */
-#ifndef ASMV
-/* For 80x86 and 680x0, an optimized version will be provided in match.asm or
- * match.S. The code will be functionally equivalent.
- */
-local uInt longest_match(s, cur_match)
-    deflate_state *s;
-    IPos cur_match;                             /* current match */
-{
-    unsigned chain_length = s->max_chain_length;/* max hash chain length */
-    register Bytef *scan = s->window + s->strstart; /* current string */
-    register Bytef *match;                      /* matched string */
-    register int len;                           /* length of current match */
-    int best_len = (int)s->prev_length;         /* best match length so far */
-    int nice_match = s->nice_match;             /* stop if match long enough */
-    IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
-        s->strstart - (IPos)MAX_DIST(s) : NIL;
-    /* Stop when cur_match becomes <= limit. To simplify the code,
-     * we prevent matches with the string of window index 0.
-     */
-    Posf *prev = s->prev;
-    uInt wmask = s->w_mask;
-
-#ifdef UNALIGNED_OK
-    /* Compare two bytes at a time. Note: this is not always beneficial.
-     * Try with and without -DUNALIGNED_OK to check.
-     */
-    register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1;
-    register ush scan_start = *(ushf*)scan;
-    register ush scan_end   = *(ushf*)(scan+best_len-1);
-#else
-    register Bytef *strend = s->window + s->strstart + MAX_MATCH;
-    register Byte scan_end1  = scan[best_len-1];
-    register Byte scan_end   = scan[best_len];
-#endif
-
-    /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
-     * It is easy to get rid of this optimization if necessary.
-     */
-    Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
-
-    /* Do not waste too much time if we already have a good match: */
-    if (s->prev_length >= s->good_match) {
-        chain_length >>= 2;
-    }
-    /* Do not look for matches beyond the end of the input. This is necessary
-     * to make deflate deterministic.
-     */
-    if ((uInt)nice_match > s->lookahead) nice_match = (int)s->lookahead;
-
-    Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
-
-    do {
-        Assert(cur_match < s->strstart, "no future");
-        match = s->window + cur_match;
-
-        /* Skip to next match if the match length cannot increase
-         * or if the match length is less than 2.  Note that the checks below
-         * for insufficient lookahead only occur occasionally for performance
-         * reasons.  Therefore uninitialized memory will be accessed, and
-         * conditional jumps will be made that depend on those values.
-         * However the length of the match is limited to the lookahead, so
-         * the output of deflate is not affected by the uninitialized values.
-         */
-#if (defined(UNALIGNED_OK) && MAX_MATCH == 258)
-        /* This code assumes sizeof(unsigned short) == 2. Do not use
-         * UNALIGNED_OK if your compiler uses a different size.
-         */
-        if (*(ushf*)(match+best_len-1) != scan_end ||
-            *(ushf*)match != scan_start) continue;
-
-        /* It is not necessary to compare scan[2] and match[2] since they are
-         * always equal when the other bytes match, given that the hash keys
-         * are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at
-         * strstart+3, +5, ... up to strstart+257. We check for insufficient
-         * lookahead only every 4th comparison; the 128th check will be made
-         * at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is
-         * necessary to put more guard bytes at the end of the window, or
-         * to check more often for insufficient lookahead.
-         */
-        Assert(scan[2] == match[2], "scan[2]?");
-        scan++, match++;
-        do {
-        } while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
-                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
-                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
-                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
-                 scan < strend);
-        /* The funny "do {}" generates better code on most compilers */
-
-        /* Here, scan <= window+strstart+257 */
-        Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
-        if (*scan == *match) scan++;
-
-        len = (MAX_MATCH - 1) - (int)(strend-scan);
-        scan = strend - (MAX_MATCH-1);
-
-#else /* UNALIGNED_OK */
-
-        if (match[best_len]   != scan_end  ||
-            match[best_len-1] != scan_end1 ||
-            *match            != *scan     ||
-            *++match          != scan[1])      continue;
-
-        /* The check at best_len-1 can be removed because it will be made
-         * again later. (This heuristic is not always a win.)
-         * It is not necessary to compare scan[2] and match[2] since they
-         * are always equal when the other bytes match, given that
-         * the hash keys are equal and that HASH_BITS >= 8.
-         */
-        scan += 2, match++;
-        Assert(*scan == *match, "match[2]?");
-
-        /* We check for insufficient lookahead only every 8th comparison;
-         * the 256th check will be made at strstart+258.
-         */
-        do {
-        } while (*++scan == *++match && *++scan == *++match &&
-                 *++scan == *++match && *++scan == *++match &&
-                 *++scan == *++match && *++scan == *++match &&
-                 *++scan == *++match && *++scan == *++match &&
-                 scan < strend);
-
-        Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
-
-        len = MAX_MATCH - (int)(strend - scan);
-        scan = strend - MAX_MATCH;
-
-#endif /* UNALIGNED_OK */
-
-        if (len > best_len) {
-            s->match_start = cur_match;
-            best_len = len;
-            if (len >= nice_match) break;
-#ifdef UNALIGNED_OK
-            scan_end = *(ushf*)(scan+best_len-1);
-#else
-            scan_end1  = scan[best_len-1];
-            scan_end   = scan[best_len];
-#endif
-        }
-    } while ((cur_match = prev[cur_match & wmask]) > limit
-             && --chain_length != 0);
-
-    if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
-    return s->lookahead;
-}
-#endif /* ASMV */
-
-#else /* FASTEST */
-
-/* ---------------------------------------------------------------------------
- * Optimized version for FASTEST only
- */
-local uInt longest_match(s, cur_match)
-    deflate_state *s;
-    IPos cur_match;                             /* current match */
-{
-    register Bytef *scan = s->window + s->strstart; /* current string */
-    register Bytef *match;                       /* matched string */
-    register int len;                           /* length of current match */
-    register Bytef *strend = s->window + s->strstart + MAX_MATCH;
-
-    /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
-     * It is easy to get rid of this optimization if necessary.
-     */
-    Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
-
-    Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
-
-    Assert(cur_match < s->strstart, "no future");
-
-    match = s->window + cur_match;
-
-    /* Return failure if the match length is less than 2:
-     */
-    if (match[0] != scan[0] || match[1] != scan[1]) return MIN_MATCH-1;
-
-    /* The check at best_len-1 can be removed because it will be made
-     * again later. (This heuristic is not always a win.)
-     * It is not necessary to compare scan[2] and match[2] since they
-     * are always equal when the other bytes match, given that
-     * the hash keys are equal and that HASH_BITS >= 8.
-     */
-    scan += 2, match += 2;
-    Assert(*scan == *match, "match[2]?");
-
-    /* We check for insufficient lookahead only every 8th comparison;
-     * the 256th check will be made at strstart+258.
-     */
-    do {
-    } while (*++scan == *++match && *++scan == *++match &&
-             *++scan == *++match && *++scan == *++match &&
-             *++scan == *++match && *++scan == *++match &&
-             *++scan == *++match && *++scan == *++match &&
-             scan < strend);
-
-    Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
-
-    len = MAX_MATCH - (int)(strend - scan);
-
-    if (len < MIN_MATCH) return MIN_MATCH - 1;
-
-    s->match_start = cur_match;
-    return (uInt)len <= s->lookahead ? (uInt)len : s->lookahead;
-}
-
-#endif /* FASTEST */
-
-#ifdef ZLIB_DEBUG
-
-#define EQUAL 0
-/* result of memcmp for equal strings */
-
-/* ===========================================================================
- * Check that the match at match_start is indeed a match.
- */
-local void check_match(s, start, match, length)
-    deflate_state *s;
-    IPos start, match;
-    int length;
-{
-    /* check that the match is indeed a match */
-    if (zmemcmp(s->window + match,
-                s->window + start, length) != EQUAL) {
-        fprintf(stderr, " start %u, match %u, length %d\n",
-                start, match, length);
-        do {
-            fprintf(stderr, "%c%c", s->window[match++], s->window[start++]);
-        } while (--length != 0);
-        z_error("invalid match");
-    }
-    if (z_verbose > 1) {
-        fprintf(stderr,"\\[%d,%d]", start-match, length);
-        do { putc(s->window[start++], stderr); } while (--length != 0);
-    }
-}
-#else
-#  define check_match(s, start, match, length)
-#endif /* ZLIB_DEBUG */
-
-/* ===========================================================================
- * Fill the window when the lookahead becomes insufficient.
- * Updates strstart and lookahead.
- *
- * IN assertion: lookahead < MIN_LOOKAHEAD
- * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD
- *    At least one byte has been read, or avail_in == 0; reads are
- *    performed for at least two bytes (required for the zip translate_eol
- *    option -- not supported here).
- */
-local void fill_window(s)
-    deflate_state *s;
-{
-    unsigned n;
-    unsigned more;    /* Amount of free space at the end of the window. */
-    uInt wsize = s->w_size;
-
-    Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead");
-
-    do {
-        more = (unsigned)(s->window_size -(ulg)s->lookahead -(ulg)s->strstart);
-
-        /* Deal with !@#$% 64K limit: */
-        if (sizeof(int) <= 2) {
-            if (more == 0 && s->strstart == 0 && s->lookahead == 0) {
-                more = wsize;
-
-            } else if (more == (unsigned)(-1)) {
-                /* Very unlikely, but possible on 16 bit machine if
-                 * strstart == 0 && lookahead == 1 (input done a byte at time)
-                 */
-                more--;
-            }
-        }
-
-        /* If the window is almost full and there is insufficient lookahead,
-         * move the upper half to the lower one to make room in the upper half.
-         */
-        if (s->strstart >= wsize+MAX_DIST(s)) {
-
-            zmemcpy(s->window, s->window+wsize, (unsigned)wsize - more);
-            s->match_start -= wsize;
-            s->strstart    -= wsize; /* we now have strstart >= MAX_DIST */
-            s->block_start -= (long) wsize;
-            slide_hash(s);
-            more += wsize;
-        }
-        if (s->strm->avail_in == 0) break;
-
-        /* If there was no sliding:
-         *    strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 &&
-         *    more == window_size - lookahead - strstart
-         * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1)
-         * => more >= window_size - 2*WSIZE + 2
-         * In the BIG_MEM or MMAP case (not yet supported),
-         *   window_size == input_size + MIN_LOOKAHEAD  &&
-         *   strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD.
-         * Otherwise, window_size == 2*WSIZE so more >= 2.
-         * If there was sliding, more >= WSIZE. So in all cases, more >= 2.
-         */
-        Assert(more >= 2, "more < 2");
-
-        n = read_buf(s->strm, s->window + s->strstart + s->lookahead, more);
-        s->lookahead += n;
-
-        /* Initialize the hash value now that we have some input: */
-        if (s->lookahead + s->insert >= MIN_MATCH) {
-            uInt str = s->strstart - s->insert;
-            s->ins_h = s->window[str];
-            UPDATE_HASH(s, s->ins_h, s->window[str + 1]);
-#if MIN_MATCH != 3
-            Call UPDATE_HASH() MIN_MATCH-3 more times
-#endif
-            while (s->insert) {
-                UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]);
-#ifndef FASTEST
-                s->prev[str & s->w_mask] = s->head[s->ins_h];
-#endif
-                s->head[s->ins_h] = (Pos)str;
-                str++;
-                s->insert--;
-                if (s->lookahead + s->insert < MIN_MATCH)
-                    break;
-            }
-        }
-        /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage,
-         * but this is not important since only literal bytes will be emitted.
-         */
-
-    } while (s->lookahead < MIN_LOOKAHEAD && s->strm->avail_in != 0);
-
-    /* If the WIN_INIT bytes after the end of the current data have never been
-     * written, then zero those bytes in order to avoid memory check reports of
-     * the use of uninitialized (or uninitialised as Julian writes) bytes by
-     * the longest match routines.  Update the high water mark for the next
-     * time through here.  WIN_INIT is set to MAX_MATCH since the longest match
-     * routines allow scanning to strstart + MAX_MATCH, ignoring lookahead.
-     */
-    if (s->high_water < s->window_size) {
-        ulg curr = s->strstart + (ulg)(s->lookahead);
-        ulg init;
-
-        if (s->high_water < curr) {
-            /* Previous high water mark below current data -- zero WIN_INIT
-             * bytes or up to end of window, whichever is less.
-             */
-            init = s->window_size - curr;
-            if (init > WIN_INIT)
-                init = WIN_INIT;
-            zmemzero(s->window + curr, (unsigned)init);
-            s->high_water = curr + init;
-        }
-        else if (s->high_water < (ulg)curr + WIN_INIT) {
-            /* High water mark at or above current data, but below current data
-             * plus WIN_INIT -- zero out to current data plus WIN_INIT, or up
-             * to end of window, whichever is less.
-             */
-            init = (ulg)curr + WIN_INIT - s->high_water;
-            if (init > s->window_size - s->high_water)
-                init = s->window_size - s->high_water;
-            zmemzero(s->window + s->high_water, (unsigned)init);
-            s->high_water += init;
-        }
-    }
-
-    Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD,
-           "not enough room for search");
-}
-
-/* ===========================================================================
- * Flush the current block, with given end-of-file flag.
- * IN assertion: strstart is set to the end of the current match.
- */
-#define FLUSH_BLOCK_ONLY(s, last) { \
-   _tr_flush_block(s, (s->block_start >= 0L ? \
-                   (charf *)&s->window[(unsigned)s->block_start] : \
-                   (charf *)Z_NULL), \
-                (ulg)((long)s->strstart - s->block_start), \
-                (last)); \
-   s->block_start = s->strstart; \
-   flush_pending(s->strm); \
-   Tracev((stderr,"[FLUSH]")); \
-}
-
-/* Same but force premature exit if necessary. */
-#define FLUSH_BLOCK(s, last) { \
-   FLUSH_BLOCK_ONLY(s, last); \
-   if (s->strm->avail_out == 0) return (last) ? finish_started : need_more; \
-}
-
-/* Maximum stored block length in deflate format (not including header). */
-#define MAX_STORED 65535
-
-/* Minimum of a and b. */
-#define MIN(a, b) ((a) > (b) ? (b) : (a))
-
-/* ===========================================================================
- * Copy without compression as much as possible from the input stream, return
- * the current block state.
- *
- * In case deflateParams() is used to later switch to a non-zero compression
- * level, s->matches (otherwise unused when storing) keeps track of the number
- * of hash table slides to perform. If s->matches is 1, then one hash table
- * slide will be done when switching. If s->matches is 2, the maximum value
- * allowed here, then the hash table will be cleared, since two or more slides
- * is the same as a clear.
- *
- * deflate_stored() is written to minimize the number of times an input byte is
- * copied. It is most efficient with large input and output buffers, which
- * maximizes the opportunites to have a single copy from next_in to next_out.
- */
-local block_state deflate_stored(s, flush)
-    deflate_state *s;
-    int flush;
-{
-    /* Smallest worthy block size when not flushing or finishing. By default
-     * this is 32K. This can be as small as 507 bytes for memLevel == 1. For
-     * large input and output buffers, the stored block size will be larger.
-     */
-    unsigned min_block = MIN(s->pending_buf_size - 5, s->w_size);
-
-    /* Copy as many min_block or larger stored blocks directly to next_out as
-     * possible. If flushing, copy the remaining available input to next_out as
-     * stored blocks, if there is enough space.
-     */
-    unsigned len, left, have, last = 0;
-    unsigned used = s->strm->avail_in;
-    do {
-        /* Set len to the maximum size block that we can copy directly with the
-         * available input data and output space. Set left to how much of that
-         * would be copied from what's left in the window.
-         */
-        len = MAX_STORED;       /* maximum deflate stored block length */
-        have = (s->bi_valid + 42) >> 3;         /* number of header bytes */
-        if (s->strm->avail_out < have)          /* need room for header */
-            break;
-            /* maximum stored block length that will fit in avail_out: */
-        have = s->strm->avail_out - have;
-        left = s->strstart - s->block_start;    /* bytes left in window */
-        if (len > (ulg)left + s->strm->avail_in)
-            len = left + s->strm->avail_in;     /* limit len to the input */
-        if (len > have)
-            len = have;                         /* limit len to the output */
-
-        /* If the stored block would be less than min_block in length, or if
-         * unable to copy all of the available input when flushing, then try
-         * copying to the window and the pending buffer instead. Also don't
-         * write an empty block when flushing -- deflate() does that.
-         */
-        if (len < min_block && ((len == 0 && flush != Z_FINISH) ||
-                                flush == Z_NO_FLUSH ||
-                                len != left + s->strm->avail_in))
-            break;
-
-        /* Make a dummy stored block in pending to get the header bytes,
-         * including any pending bits. This also updates the debugging counts.
-         */
-        last = flush == Z_FINISH && len == left + s->strm->avail_in ? 1 : 0;
-        _tr_stored_block(s, (char *)0, 0L, last);
-
-        /* Replace the lengths in the dummy stored block with len. */
-        s->pending_buf[s->pending - 4] = len;
-        s->pending_buf[s->pending - 3] = len >> 8;
-        s->pending_buf[s->pending - 2] = ~len;
-        s->pending_buf[s->pending - 1] = ~len >> 8;
-
-        /* Write the stored block header bytes. */
-        flush_pending(s->strm);
-
-#ifdef ZLIB_DEBUG
-        /* Update debugging counts for the data about to be copied. */
-        s->compressed_len += len << 3;
-        s->bits_sent += len << 3;
-#endif
-
-        /* Copy uncompressed bytes from the window to next_out. */
-        if (left) {
-            if (left > len)
-                left = len;
-            zmemcpy(s->strm->next_out, s->window + s->block_start, left);
-            s->strm->next_out += left;
-            s->strm->avail_out -= left;
-            s->strm->total_out += left;
-            s->block_start += left;
-            len -= left;
-        }
-
-        /* Copy uncompressed bytes directly from next_in to next_out, updating
-         * the check value.
-         */
-        if (len) {
-            read_buf(s->strm, s->strm->next_out, len);
-            s->strm->next_out += len;
-            s->strm->avail_out -= len;
-            s->strm->total_out += len;
-        }
-    } while (last == 0);
-
-    /* Update the sliding window with the last s->w_size bytes of the copied
-     * data, or append all of the copied data to the existing window if less
-     * than s->w_size bytes were copied. Also update the number of bytes to
-     * insert in the hash tables, in the event that deflateParams() switches to
-     * a non-zero compression level.
-     */
-    used -= s->strm->avail_in;      /* number of input bytes directly copied */
-    if (used) {
-        /* If any input was used, then no unused input remains in the window,
-         * therefore s->block_start == s->strstart.
-         */
-        if (used >= s->w_size) {    /* supplant the previous history */
-            s->matches = 2;         /* clear hash */
-            zmemcpy(s->window, s->strm->next_in - s->w_size, s->w_size);
-            s->strstart = s->w_size;
-        }
-        else {
-            if (s->window_size - s->strstart <= used) {
-                /* Slide the window down. */
-                s->strstart -= s->w_size;
-                zmemcpy(s->window, s->window + s->w_size, s->strstart);
-                if (s->matches < 2)
-                    s->matches++;   /* add a pending slide_hash() */
-            }
-            zmemcpy(s->window + s->strstart, s->strm->next_in - used, used);
-            s->strstart += used;
-        }
-        s->block_start = s->strstart;
-        s->insert += MIN(used, s->w_size - s->insert);
-    }
-    if (s->high_water < s->strstart)
-        s->high_water = s->strstart;
-
-    /* If the last block was written to next_out, then done. */
-    if (last)
-        return finish_done;
-
-    /* If flushing and all input has been consumed, then done. */
-    if (flush != Z_NO_FLUSH && flush != Z_FINISH &&
-        s->strm->avail_in == 0 && (long)s->strstart == s->block_start)
-        return block_done;
-
-    /* Fill the window with any remaining input. */
-    have = s->window_size - s->strstart - 1;
-    if (s->strm->avail_in > have && s->block_start >= (long)s->w_size) {
-        /* Slide the window down. */
-        s->block_start -= s->w_size;
-        s->strstart -= s->w_size;
-        zmemcpy(s->window, s->window + s->w_size, s->strstart);
-        if (s->matches < 2)
-            s->matches++;           /* add a pending slide_hash() */
-        have += s->w_size;          /* more space now */
-    }
-    if (have > s->strm->avail_in)
-        have = s->strm->avail_in;
-    if (have) {
-        read_buf(s->strm, s->window + s->strstart, have);
-        s->strstart += have;
-    }
-    if (s->high_water < s->strstart)
-        s->high_water = s->strstart;
-
-    /* There was not enough avail_out to write a complete worthy or flushed
-     * stored block to next_out. Write a stored block to pending instead, if we
-     * have enough input for a worthy block, or if flushing and there is enough
-     * room for the remaining input as a stored block in the pending buffer.
-     */
-    have = (s->bi_valid + 42) >> 3;         /* number of header bytes */
-        /* maximum stored block length that will fit in pending: */
-    have = MIN(s->pending_buf_size - have, MAX_STORED);
-    min_block = MIN(have, s->w_size);
-    left = s->strstart - s->block_start;
-    if (left >= min_block ||
-        ((left || flush == Z_FINISH) && flush != Z_NO_FLUSH &&
-         s->strm->avail_in == 0 && left <= have)) {
-        len = MIN(left, have);
-        last = flush == Z_FINISH && s->strm->avail_in == 0 &&
-               len == left ? 1 : 0;
-        _tr_stored_block(s, (charf *)s->window + s->block_start, len, last);
-        s->block_start += len;
-        flush_pending(s->strm);
-    }
-
-    /* We've done all we can with the available input and output. */
-    return last ? finish_started : need_more;
-}
-
-/* ===========================================================================
- * Compress as much as possible from the input stream, return the current
- * block state.
- * This function does not perform lazy evaluation of matches and inserts
- * new strings in the dictionary only for unmatched strings or for short
- * matches. It is used only for the fast compression options.
- */
-local block_state deflate_fast(s, flush)
-    deflate_state *s;
-    int flush;
-{
-    IPos hash_head;       /* head of the hash chain */
-    int bflush;           /* set if current block must be flushed */
-
-    for (;;) {
-        /* Make sure that we always have enough lookahead, except
-         * at the end of the input file. We need MAX_MATCH bytes
-         * for the next match, plus MIN_MATCH bytes to insert the
-         * string following the next match.
-         */
-        if (s->lookahead < MIN_LOOKAHEAD) {
-            fill_window(s);
-            if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
-                return need_more;
-            }
-            if (s->lookahead == 0) break; /* flush the current block */
-        }
-
-        /* Insert the string window[strstart .. strstart+2] in the
-         * dictionary, and set hash_head to the head of the hash chain:
-         */
-        hash_head = NIL;
-        if (s->lookahead >= MIN_MATCH) {
-            INSERT_STRING(s, s->strstart, hash_head);
-        }
-
-        /* Find the longest match, discarding those <= prev_length.
-         * At this point we have always match_length < MIN_MATCH
-         */
-        if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) {
-            /* To simplify the code, we prevent matches with the string
-             * of window index 0 (in particular we have to avoid a match
-             * of the string with itself at the start of the input file).
-             */
-            s->match_length = longest_match (s, hash_head);
-            /* longest_match() sets match_start */
-        }
-        if (s->match_length >= MIN_MATCH) {
-            check_match(s, s->strstart, s->match_start, s->match_length);
-
-            _tr_tally_dist(s, s->strstart - s->match_start,
-                           s->match_length - MIN_MATCH, bflush);
-
-            s->lookahead -= s->match_length;
-
-            /* Insert new strings in the hash table only if the match length
-             * is not too large. This saves time but degrades compression.
-             */
-#ifndef FASTEST
-            if (s->match_length <= s->max_insert_length &&
-                s->lookahead >= MIN_MATCH) {
-                s->match_length--; /* string at strstart already in table */
-                do {
-                    s->strstart++;
-                    INSERT_STRING(s, s->strstart, hash_head);
-                    /* strstart never exceeds WSIZE-MAX_MATCH, so there are
-                     * always MIN_MATCH bytes ahead.
-                     */
-                } while (--s->match_length != 0);
-                s->strstart++;
-            } else
-#endif
-            {
-                s->strstart += s->match_length;
-                s->match_length = 0;
-                s->ins_h = s->window[s->strstart];
-                UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]);
-#if MIN_MATCH != 3
-                Call UPDATE_HASH() MIN_MATCH-3 more times
-#endif
-                /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not
-                 * matter since it will be recomputed at next deflate call.
-                 */
-            }
-        } else {
-            /* No match, output a literal byte */
-            Tracevv((stderr,"%c", s->window[s->strstart]));
-            _tr_tally_lit (s, s->window[s->strstart], bflush);
-            s->lookahead--;
-            s->strstart++;
-        }
-        if (bflush) FLUSH_BLOCK(s, 0);
-    }
-    s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1;
-    if (flush == Z_FINISH) {
-        FLUSH_BLOCK(s, 1);
-        return finish_done;
-    }
-    if (s->last_lit)
-        FLUSH_BLOCK(s, 0);
-    return block_done;
-}
-
-#ifndef FASTEST
-/* ===========================================================================
- * Same as above, but achieves better compression. We use a lazy
- * evaluation for matches: a match is finally adopted only if there is
- * no better match at the next window position.
- */
-local block_state deflate_slow(s, flush)
-    deflate_state *s;
-    int flush;
-{
-    IPos hash_head;          /* head of hash chain */
-    int bflush;              /* set if current block must be flushed */
-
-    /* Process the input block. */
-    for (;;) {
-        /* Make sure that we always have enough lookahead, except
-         * at the end of the input file. We need MAX_MATCH bytes
-         * for the next match, plus MIN_MATCH bytes to insert the
-         * string following the next match.
-         */
-        if (s->lookahead < MIN_LOOKAHEAD) {
-            fill_window(s);
-            if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
-                return need_more;
-            }
-            if (s->lookahead == 0) break; /* flush the current block */
-        }
-
-        /* Insert the string window[strstart .. strstart+2] in the
-         * dictionary, and set hash_head to the head of the hash chain:
-         */
-        hash_head = NIL;
-        if (s->lookahead >= MIN_MATCH) {
-            INSERT_STRING(s, s->strstart, hash_head);
-        }
-
-        /* Find the longest match, discarding those <= prev_length.
-         */
-        s->prev_length = s->match_length, s->prev_match = s->match_start;
-        s->match_length = MIN_MATCH-1;
-
-        if (hash_head != NIL && s->prev_length < s->max_lazy_match &&
-            s->strstart - hash_head <= MAX_DIST(s)) {
-            /* To simplify the code, we prevent matches with the string
-             * of window index 0 (in particular we have to avoid a match
-             * of the string with itself at the start of the input file).
-             */
-            s->match_length = longest_match (s, hash_head);
-            /* longest_match() sets match_start */
-
-            if (s->match_length <= 5 && (s->strategy == Z_FILTERED
-#if TOO_FAR <= 32767
-                || (s->match_length == MIN_MATCH &&
-                    s->strstart - s->match_start > TOO_FAR)
-#endif
-                )) {
-
-                /* If prev_match is also MIN_MATCH, match_start is garbage
-                 * but we will ignore the current match anyway.
-                 */
-                s->match_length = MIN_MATCH-1;
-            }
-        }
-        /* If there was a match at the previous step and the current
-         * match is not better, output the previous match:
-         */
-        if (s->prev_length >= MIN_MATCH && s->match_length <= s->prev_length) {
-            uInt max_insert = s->strstart + s->lookahead - MIN_MATCH;
-            /* Do not insert strings in hash table beyond this. */
-
-            check_match(s, s->strstart-1, s->prev_match, s->prev_length);
-
-            _tr_tally_dist(s, s->strstart -1 - s->prev_match,
-                           s->prev_length - MIN_MATCH, bflush);
-
-            /* Insert in hash table all strings up to the end of the match.
-             * strstart-1 and strstart are already inserted. If there is not
-             * enough lookahead, the last two strings are not inserted in
-             * the hash table.
-             */
-            s->lookahead -= s->prev_length-1;
-            s->prev_length -= 2;
-            do {
-                if (++s->strstart <= max_insert) {
-                    INSERT_STRING(s, s->strstart, hash_head);
-                }
-            } while (--s->prev_length != 0);
-            s->match_available = 0;
-            s->match_length = MIN_MATCH-1;
-            s->strstart++;
-
-            if (bflush) FLUSH_BLOCK(s, 0);
-
-        } else if (s->match_available) {
-            /* If there was no match at the previous position, output a
-             * single literal. If there was a match but the current match
-             * is longer, truncate the previous match to a single literal.
-             */
-            Tracevv((stderr,"%c", s->window[s->strstart-1]));
-            _tr_tally_lit(s, s->window[s->strstart-1], bflush);
-            if (bflush) {
-                FLUSH_BLOCK_ONLY(s, 0);
-            }
-            s->strstart++;
-            s->lookahead--;
-            if (s->strm->avail_out == 0) return need_more;
-        } else {
-            /* There is no previous match to compare with, wait for
-             * the next step to decide.
-             */
-            s->match_available = 1;
-            s->strstart++;
-            s->lookahead--;
-        }
-    }
-    Assert (flush != Z_NO_FLUSH, "no flush?");
-    if (s->match_available) {
-        Tracevv((stderr,"%c", s->window[s->strstart-1]));
-        _tr_tally_lit(s, s->window[s->strstart-1], bflush);
-        s->match_available = 0;
-    }
-    s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1;
-    if (flush == Z_FINISH) {
-        FLUSH_BLOCK(s, 1);
-        return finish_done;
-    }
-    if (s->last_lit)
-        FLUSH_BLOCK(s, 0);
-    return block_done;
-}
-#endif /* FASTEST */
-
-/* ===========================================================================
- * For Z_RLE, simply look for runs of bytes, generate matches only of distance
- * one.  Do not maintain a hash table.  (It will be regenerated if this run of
- * deflate switches away from Z_RLE.)
- */
-local block_state deflate_rle(s, flush)
-    deflate_state *s;
-    int flush;
-{
-    int bflush;             /* set if current block must be flushed */
-    uInt prev;              /* byte at distance one to match */
-    Bytef *scan, *strend;   /* scan goes up to strend for length of run */
-
-    for (;;) {
-        /* Make sure that we always have enough lookahead, except
-         * at the end of the input file. We need MAX_MATCH bytes
-         * for the longest run, plus one for the unrolled loop.
-         */
-        if (s->lookahead <= MAX_MATCH) {
-            fill_window(s);
-            if (s->lookahead <= MAX_MATCH && flush == Z_NO_FLUSH) {
-                return need_more;
-            }
-            if (s->lookahead == 0) break; /* flush the current block */
-        }
-
-        /* See how many times the previous byte repeats */
-        s->match_length = 0;
-        if (s->lookahead >= MIN_MATCH && s->strstart > 0) {
-            scan = s->window + s->strstart - 1;
-            prev = *scan;
-            if (prev == *++scan && prev == *++scan && prev == *++scan) {
-                strend = s->window + s->strstart + MAX_MATCH;
-                do {
-                } while (prev == *++scan && prev == *++scan &&
-                         prev == *++scan && prev == *++scan &&
-                         prev == *++scan && prev == *++scan &&
-                         prev == *++scan && prev == *++scan &&
-                         scan < strend);
-                s->match_length = MAX_MATCH - (uInt)(strend - scan);
-                if (s->match_length > s->lookahead)
-                    s->match_length = s->lookahead;
-            }
-            Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan");
-        }
-
-        /* Emit match if have run of MIN_MATCH or longer, else emit literal */
-        if (s->match_length >= MIN_MATCH) {
-            check_match(s, s->strstart, s->strstart - 1, s->match_length);
-
-            _tr_tally_dist(s, 1, s->match_length - MIN_MATCH, bflush);
-
-            s->lookahead -= s->match_length;
-            s->strstart += s->match_length;
-            s->match_length = 0;
-        } else {
-            /* No match, output a literal byte */
-            Tracevv((stderr,"%c", s->window[s->strstart]));
-            _tr_tally_lit (s, s->window[s->strstart], bflush);
-            s->lookahead--;
-            s->strstart++;
-        }
-        if (bflush) FLUSH_BLOCK(s, 0);
-    }
-    s->insert = 0;
-    if (flush == Z_FINISH) {
-        FLUSH_BLOCK(s, 1);
-        return finish_done;
-    }
-    if (s->last_lit)
-        FLUSH_BLOCK(s, 0);
-    return block_done;
-}
-
-/* ===========================================================================
- * For Z_HUFFMAN_ONLY, do not look for matches.  Do not maintain a hash table.
- * (It will be regenerated if this run of deflate switches away from Huffman.)
- */
-local block_state deflate_huff(s, flush)
-    deflate_state *s;
-    int flush;
-{
-    int bflush;             /* set if current block must be flushed */
-
-    for (;;) {
-        /* Make sure that we have a literal to write. */
-        if (s->lookahead == 0) {
-            fill_window(s);
-            if (s->lookahead == 0) {
-                if (flush == Z_NO_FLUSH)
-                    return need_more;
-                break;      /* flush the current block */
-            }
-        }
-
-        /* Output a literal byte */
-        s->match_length = 0;
-        Tracevv((stderr,"%c", s->window[s->strstart]));
-        _tr_tally_lit (s, s->window[s->strstart], bflush);
-        s->lookahead--;
-        s->strstart++;
-        if (bflush) FLUSH_BLOCK(s, 0);
-    }
-    s->insert = 0;
-    if (flush == Z_FINISH) {
-        FLUSH_BLOCK(s, 1);
-        return finish_done;
-    }
-    if (s->last_lit)
-        FLUSH_BLOCK(s, 0);
-    return block_done;
-}
diff --git a/src/png/zlib/deflate.h b/src/png/zlib/deflate.h
deleted file mode 100644
index 23ecdd312..000000000
--- a/src/png/zlib/deflate.h
+++ /dev/null
@@ -1,349 +0,0 @@
-/* deflate.h -- internal compression state
- * Copyright (C) 1995-2016 Jean-loup Gailly
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* WARNING: this file should *not* be used by applications. It is
-   part of the implementation of the compression library and is
-   subject to change. Applications should only use zlib.h.
- */
-
-/* @(#) $Id$ */
-
-#ifndef DEFLATE_H
-#define DEFLATE_H
-
-#include "zutil.h"
-
-/* define NO_GZIP when compiling if you want to disable gzip header and
-   trailer creation by deflate().  NO_GZIP would be used to avoid linking in
-   the crc code when it is not needed.  For shared libraries, gzip encoding
-   should be left enabled. */
-#ifndef NO_GZIP
-#  define GZIP
-#endif
-
-/* ===========================================================================
- * Internal compression state.
- */
-
-#define LENGTH_CODES 29
-/* number of length codes, not counting the special END_BLOCK code */
-
-#define LITERALS  256
-/* number of literal bytes 0..255 */
-
-#define L_CODES (LITERALS+1+LENGTH_CODES)
-/* number of Literal or Length codes, including the END_BLOCK code */
-
-#define D_CODES   30
-/* number of distance codes */
-
-#define BL_CODES  19
-/* number of codes used to transfer the bit lengths */
-
-#define HEAP_SIZE (2*L_CODES+1)
-/* maximum heap size */
-
-#define MAX_BITS 15
-/* All codes must not exceed MAX_BITS bits */
-
-#define Buf_size 16
-/* size of bit buffer in bi_buf */
-
-#define INIT_STATE    42    /* zlib header -> BUSY_STATE */
-#ifdef GZIP
-#  define GZIP_STATE  57    /* gzip header -> BUSY_STATE | EXTRA_STATE */
-#endif
-#define EXTRA_STATE   69    /* gzip extra block -> NAME_STATE */
-#define NAME_STATE    73    /* gzip file name -> COMMENT_STATE */
-#define COMMENT_STATE 91    /* gzip comment -> HCRC_STATE */
-#define HCRC_STATE   103    /* gzip header CRC -> BUSY_STATE */
-#define BUSY_STATE   113    /* deflate -> FINISH_STATE */
-#define FINISH_STATE 666    /* stream complete */
-/* Stream status */
-
-
-/* Data structure describing a single value and its code string. */
-typedef struct ct_data_s {
-    union {
-        ush  freq;       /* frequency count */
-        ush  code;       /* bit string */
-    } fc;
-    union {
-        ush  dad;        /* father node in Huffman tree */
-        ush  len;        /* length of bit string */
-    } dl;
-} FAR ct_data;
-
-#define Freq fc.freq
-#define Code fc.code
-#define Dad  dl.dad
-#define Len  dl.len
-
-typedef struct static_tree_desc_s  static_tree_desc;
-
-typedef struct tree_desc_s {
-    ct_data *dyn_tree;           /* the dynamic tree */
-    int     max_code;            /* largest code with non zero frequency */
-    const static_tree_desc *stat_desc;  /* the corresponding static tree */
-} FAR tree_desc;
-
-typedef ush Pos;
-typedef Pos FAR Posf;
-typedef unsigned IPos;
-
-/* A Pos is an index in the character window. We use short instead of int to
- * save space in the various tables. IPos is used only for parameter passing.
- */
-
-typedef struct internal_state {
-    z_streamp strm;      /* pointer back to this zlib stream */
-    int   status;        /* as the name implies */
-    Bytef *pending_buf;  /* output still pending */
-    ulg   pending_buf_size; /* size of pending_buf */
-    Bytef *pending_out;  /* next pending byte to output to the stream */
-    ulg   pending;       /* nb of bytes in the pending buffer */
-    int   wrap;          /* bit 0 true for zlib, bit 1 true for gzip */
-    gz_headerp  gzhead;  /* gzip header information to write */
-    ulg   gzindex;       /* where in extra, name, or comment */
-    Byte  method;        /* can only be DEFLATED */
-    int   last_flush;    /* value of flush param for previous deflate call */
-
-                /* used by deflate.c: */
-
-    uInt  w_size;        /* LZ77 window size (32K by default) */
-    uInt  w_bits;        /* log2(w_size)  (8..16) */
-    uInt  w_mask;        /* w_size - 1 */
-
-    Bytef *window;
-    /* Sliding window. Input bytes are read into the second half of the window,
-     * and move to the first half later to keep a dictionary of at least wSize
-     * bytes. With this organization, matches are limited to a distance of
-     * wSize-MAX_MATCH bytes, but this ensures that IO is always
-     * performed with a length multiple of the block size. Also, it limits
-     * the window size to 64K, which is quite useful on MSDOS.
-     * To do: use the user input buffer as sliding window.
-     */
-
-    ulg window_size;
-    /* Actual size of window: 2*wSize, except when the user input buffer
-     * is directly used as sliding window.
-     */
-
-    Posf *prev;
-    /* Link to older string with same hash index. To limit the size of this
-     * array to 64K, this link is maintained only for the last 32K strings.
-     * An index in this array is thus a window index modulo 32K.
-     */
-
-    Posf *head; /* Heads of the hash chains or NIL. */
-
-    uInt  ins_h;          /* hash index of string to be inserted */
-    uInt  hash_size;      /* number of elements in hash table */
-    uInt  hash_bits;      /* log2(hash_size) */
-    uInt  hash_mask;      /* hash_size-1 */
-
-    uInt  hash_shift;
-    /* Number of bits by which ins_h must be shifted at each input
-     * step. It must be such that after MIN_MATCH steps, the oldest
-     * byte no longer takes part in the hash key, that is:
-     *   hash_shift * MIN_MATCH >= hash_bits
-     */
-
-    long block_start;
-    /* Window position at the beginning of the current output block. Gets
-     * negative when the window is moved backwards.
-     */
-
-    uInt match_length;           /* length of best match */
-    IPos prev_match;             /* previous match */
-    int match_available;         /* set if previous match exists */
-    uInt strstart;               /* start of string to insert */
-    uInt match_start;            /* start of matching string */
-    uInt lookahead;              /* number of valid bytes ahead in window */
-
-    uInt prev_length;
-    /* Length of the best match at previous step. Matches not greater than this
-     * are discarded. This is used in the lazy match evaluation.
-     */
-
-    uInt max_chain_length;
-    /* To speed up deflation, hash chains are never searched beyond this
-     * length.  A higher limit improves compression ratio but degrades the
-     * speed.
-     */
-
-    uInt max_lazy_match;
-    /* Attempt to find a better match only when the current match is strictly
-     * smaller than this value. This mechanism is used only for compression
-     * levels >= 4.
-     */
-#   define max_insert_length  max_lazy_match
-    /* Insert new strings in the hash table only if the match length is not
-     * greater than this length. This saves time but degrades compression.
-     * max_insert_length is used only for compression levels <= 3.
-     */
-
-    int level;    /* compression level (1..9) */
-    int strategy; /* favor or force Huffman coding*/
-
-    uInt good_match;
-    /* Use a faster search when the previous match is longer than this */
-
-    int nice_match; /* Stop searching when current match exceeds this */
-
-                /* used by trees.c: */
-    /* Didn't use ct_data typedef below to suppress compiler warning */
-    struct ct_data_s dyn_ltree[HEAP_SIZE];   /* literal and length tree */
-    struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
-    struct ct_data_s bl_tree[2*BL_CODES+1];  /* Huffman tree for bit lengths */
-
-    struct tree_desc_s l_desc;               /* desc. for literal tree */
-    struct tree_desc_s d_desc;               /* desc. for distance tree */
-    struct tree_desc_s bl_desc;              /* desc. for bit length tree */
-
-    ush bl_count[MAX_BITS+1];
-    /* number of codes at each bit length for an optimal tree */
-
-    int heap[2*L_CODES+1];      /* heap used to build the Huffman trees */
-    int heap_len;               /* number of elements in the heap */
-    int heap_max;               /* element of largest frequency */
-    /* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
-     * The same heap array is used to build all trees.
-     */
-
-    uch depth[2*L_CODES+1];
-    /* Depth of each subtree used as tie breaker for trees of equal frequency
-     */
-
-    uchf *l_buf;          /* buffer for literals or lengths */
-
-    uInt  lit_bufsize;
-    /* Size of match buffer for literals/lengths.  There are 4 reasons for
-     * limiting lit_bufsize to 64K:
-     *   - frequencies can be kept in 16 bit counters
-     *   - if compression is not successful for the first block, all input
-     *     data is still in the window so we can still emit a stored block even
-     *     when input comes from standard input.  (This can also be done for
-     *     all blocks if lit_bufsize is not greater than 32K.)
-     *   - if compression is not successful for a file smaller than 64K, we can
-     *     even emit a stored file instead of a stored block (saving 5 bytes).
-     *     This is applicable only for zip (not gzip or zlib).
-     *   - creating new Huffman trees less frequently may not provide fast
-     *     adaptation to changes in the input data statistics. (Take for
-     *     example a binary file with poorly compressible code followed by
-     *     a highly compressible string table.) Smaller buffer sizes give
-     *     fast adaptation but have of course the overhead of transmitting
-     *     trees more frequently.
-     *   - I can't count above 4
-     */
-
-    uInt last_lit;      /* running index in l_buf */
-
-    ushf *d_buf;
-    /* Buffer for distances. To simplify the code, d_buf and l_buf have
-     * the same number of elements. To use different lengths, an extra flag
-     * array would be necessary.
-     */
-
-    ulg opt_len;        /* bit length of current block with optimal trees */
-    ulg static_len;     /* bit length of current block with static trees */
-    uInt matches;       /* number of string matches in current block */
-    uInt insert;        /* bytes at end of window left to insert */
-
-#ifdef ZLIB_DEBUG
-    ulg compressed_len; /* total bit length of compressed file mod 2^32 */
-    ulg bits_sent;      /* bit length of compressed data sent mod 2^32 */
-#endif
-
-    ush bi_buf;
-    /* Output buffer. bits are inserted starting at the bottom (least
-     * significant bits).
-     */
-    int bi_valid;
-    /* Number of valid bits in bi_buf.  All bits above the last valid bit
-     * are always zero.
-     */
-
-    ulg high_water;
-    /* High water mark offset in window for initialized bytes -- bytes above
-     * this are set to zero in order to avoid memory check warnings when
-     * longest match routines access bytes past the input.  This is then
-     * updated to the new high water mark.
-     */
-
-} FAR deflate_state;
-
-/* Output a byte on the stream.
- * IN assertion: there is enough room in pending_buf.
- */
-#define put_byte(s, c) {s->pending_buf[s->pending++] = (Bytef)(c);}
-
-
-#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
-/* Minimum amount of lookahead, except at the end of the input file.
- * See deflate.c for comments about the MIN_MATCH+1.
- */
-
-#define MAX_DIST(s)  ((s)->w_size-MIN_LOOKAHEAD)
-/* In order to simplify the code, particularly on 16 bit machines, match
- * distances are limited to MAX_DIST instead of WSIZE.
- */
-
-#define WIN_INIT MAX_MATCH
-/* Number of bytes after end of data in window to initialize in order to avoid
-   memory checker errors from longest match routines */
-
-        /* in trees.c */
-void ZLIB_INTERNAL _tr_init OF((deflate_state *s));
-int ZLIB_INTERNAL _tr_tally OF((deflate_state *s, unsigned dist, unsigned lc));
-void ZLIB_INTERNAL _tr_flush_block OF((deflate_state *s, charf *buf,
-                        ulg stored_len, int last));
-void ZLIB_INTERNAL _tr_flush_bits OF((deflate_state *s));
-void ZLIB_INTERNAL _tr_align OF((deflate_state *s));
-void ZLIB_INTERNAL _tr_stored_block OF((deflate_state *s, charf *buf,
-                        ulg stored_len, int last));
-
-#define d_code(dist) \
-   ((dist) < 256 ? _dist_code[dist] : _dist_code[256+((dist)>>7)])
-/* Mapping from a distance to a distance code. dist is the distance - 1 and
- * must not have side effects. _dist_code[256] and _dist_code[257] are never
- * used.
- */
-
-#ifndef ZLIB_DEBUG
-/* Inline versions of _tr_tally for speed: */
-
-#if defined(GEN_TREES_H) || !defined(STDC)
-  extern uch ZLIB_INTERNAL _length_code[];
-  extern uch ZLIB_INTERNAL _dist_code[];
-#else
-  extern const uch ZLIB_INTERNAL _length_code[];
-  extern const uch ZLIB_INTERNAL _dist_code[];
-#endif
-
-# define _tr_tally_lit(s, c, flush) \
-  { uch cc = (c); \
-    s->d_buf[s->last_lit] = 0; \
-    s->l_buf[s->last_lit++] = cc; \
-    s->dyn_ltree[cc].Freq++; \
-    flush = (s->last_lit == s->lit_bufsize-1); \
-   }
-# define _tr_tally_dist(s, distance, length, flush) \
-  { uch len = (uch)(length); \
-    ush dist = (ush)(distance); \
-    s->d_buf[s->last_lit] = dist; \
-    s->l_buf[s->last_lit++] = len; \
-    dist--; \
-    s->dyn_ltree[_length_code[len]+LITERALS+1].Freq++; \
-    s->dyn_dtree[d_code(dist)].Freq++; \
-    flush = (s->last_lit == s->lit_bufsize-1); \
-  }
-#else
-# define _tr_tally_lit(s, c, flush) flush = _tr_tally(s, 0, c)
-# define _tr_tally_dist(s, distance, length, flush) \
-              flush = _tr_tally(s, distance, length)
-#endif
-
-#endif /* DEFLATE_H */
diff --git a/src/png/zlib/gzclose.c b/src/png/zlib/gzclose.c
deleted file mode 100644
index caeb99a31..000000000
--- a/src/png/zlib/gzclose.c
+++ /dev/null
@@ -1,25 +0,0 @@
-/* gzclose.c -- zlib gzclose() function
- * Copyright (C) 2004, 2010 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-#include "gzguts.h"
-
-/* gzclose() is in a separate file so that it is linked in only if it is used.
-   That way the other gzclose functions can be used instead to avoid linking in
-   unneeded compression or decompression routines. */
-int ZEXPORT gzclose(file)
-    gzFile file;
-{
-#ifndef NO_GZCOMPRESS
-    gz_statep state;
-
-    if (file == NULL)
-        return Z_STREAM_ERROR;
-    state = (gz_statep)file;
-
-    return state->mode == GZ_READ ? gzclose_r(file) : gzclose_w(file);
-#else
-    return gzclose_r(file);
-#endif
-}
diff --git a/src/png/zlib/gzguts.h b/src/png/zlib/gzguts.h
deleted file mode 100644
index 990a4d251..000000000
--- a/src/png/zlib/gzguts.h
+++ /dev/null
@@ -1,218 +0,0 @@
-/* gzguts.h -- zlib internal header definitions for gz* operations
- * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-#ifdef _LARGEFILE64_SOURCE
-#  ifndef _LARGEFILE_SOURCE
-#    define _LARGEFILE_SOURCE 1
-#  endif
-#  ifdef _FILE_OFFSET_BITS
-#    undef _FILE_OFFSET_BITS
-#  endif
-#endif
-
-#ifdef HAVE_HIDDEN
-#  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
-#else
-#  define ZLIB_INTERNAL
-#endif
-
-#include <stdio.h>
-#include "zlib.h"
-#ifdef STDC
-#  include <string.h>
-#  include <stdlib.h>
-#  include <limits.h>
-#endif
-
-#ifndef _POSIX_SOURCE
-#  define _POSIX_SOURCE
-#endif
-#include <fcntl.h>
-
-#ifdef _WIN32
-#  include <stddef.h>
-#endif
-
-#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
-#  include <io.h>
-#endif
-
-#if defined(_WIN32) || defined(__CYGWIN__)
-#  define WIDECHAR
-#endif
-
-#ifdef WINAPI_FAMILY
-#  define open _open
-#  define read _read
-#  define write _write
-#  define close _close
-#endif
-
-#ifdef NO_DEFLATE       /* for compatibility with old definition */
-#  define NO_GZCOMPRESS
-#endif
-
-#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
-#  ifndef HAVE_VSNPRINTF
-#    define HAVE_VSNPRINTF
-#  endif
-#endif
-
-#if defined(__CYGWIN__)
-#  ifndef HAVE_VSNPRINTF
-#    define HAVE_VSNPRINTF
-#  endif
-#endif
-
-#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
-#  ifndef HAVE_VSNPRINTF
-#    define HAVE_VSNPRINTF
-#  endif
-#endif
-
-#ifndef HAVE_VSNPRINTF
-#  ifdef MSDOS
-/* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
-   but for now we just assume it doesn't. */
-#    define NO_vsnprintf
-#  endif
-#  ifdef __TURBOC__
-#    define NO_vsnprintf
-#  endif
-#  ifdef WIN32
-/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
-#    if !defined(vsnprintf) && !defined(NO_vsnprintf)
-#      if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
-#         define vsnprintf _vsnprintf
-#      endif
-#    endif
-#  endif
-#  ifdef __SASC
-#    define NO_vsnprintf
-#  endif
-#  ifdef VMS
-#    define NO_vsnprintf
-#  endif
-#  ifdef __OS400__
-#    define NO_vsnprintf
-#  endif
-#  ifdef __MVS__
-#    define NO_vsnprintf
-#  endif
-#endif
-
-/* unlike snprintf (which is required in C99), _snprintf does not guarantee
-   null termination of the result -- however this is only used in gzlib.c where
-   the result is assured to fit in the space provided */
-#if defined(_MSC_VER) && _MSC_VER < 1900
-#  define snprintf _snprintf
-#endif
-
-#ifndef local
-#  define local static
-#endif
-/* since "static" is used to mean two completely different things in C, we
-   define "local" for the non-static meaning of "static", for readability
-   (compile with -Dlocal if your debugger can't find static symbols) */
-
-/* gz* functions always use library allocation functions */
-#ifndef STDC
-  extern voidp  malloc OF((uInt size));
-  extern void   free   OF((voidpf ptr));
-#endif
-
-/* get errno and strerror definition */
-#if defined UNDER_CE
-#  include <windows.h>
-#  define zstrerror() gz_strwinerror((DWORD)GetLastError())
-#else
-#  ifndef NO_STRERROR
-#    include <errno.h>
-#    define zstrerror() strerror(errno)
-#  else
-#    define zstrerror() "stdio error (consult errno)"
-#  endif
-#endif
-
-/* provide prototypes for these when building zlib without LFS */
-#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
-    ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
-    ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
-    ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
-    ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
-#endif
-
-/* default memLevel */
-#if MAX_MEM_LEVEL >= 8
-#  define DEF_MEM_LEVEL 8
-#else
-#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
-#endif
-
-/* default i/o buffer size -- double this for output when reading (this and
-   twice this must be able to fit in an unsigned type) */
-#define GZBUFSIZE 8192
-
-/* gzip modes, also provide a little integrity check on the passed structure */
-#define GZ_NONE 0
-#define GZ_READ 7247
-#define GZ_WRITE 31153
-#define GZ_APPEND 1     /* mode set to GZ_WRITE after the file is opened */
-
-/* values for gz_state how */
-#define LOOK 0      /* look for a gzip header */
-#define COPY 1      /* copy input directly */
-#define GZIP 2      /* decompress a gzip stream */
-
-/* internal gzip file state data structure */
-typedef struct {
-        /* exposed contents for gzgetc() macro */
-    struct gzFile_s x;      /* "x" for exposed */
-                            /* x.have: number of bytes available at x.next */
-                            /* x.next: next output data to deliver or write */
-                            /* x.pos: current position in uncompressed data */
-        /* used for both reading and writing */
-    int mode;               /* see gzip modes above */
-    int fd;                 /* file descriptor */
-    char *path;             /* path or fd for error messages */
-    unsigned size;          /* buffer size, zero if not allocated yet */
-    unsigned want;          /* requested buffer size, default is GZBUFSIZE */
-    unsigned char *in;      /* input buffer (double-sized when writing) */
-    unsigned char *out;     /* output buffer (double-sized when reading) */
-    int direct;             /* 0 if processing gzip, 1 if transparent */
-        /* just for reading */
-    int how;                /* 0: get header, 1: copy, 2: decompress */
-    z_off64_t start;        /* where the gzip data started, for rewinding */
-    int eof;                /* true if end of input file reached */
-    int past;               /* true if read requested past end */
-        /* just for writing */
-    int level;              /* compression level */
-    int strategy;           /* compression strategy */
-        /* seek request */
-    z_off64_t skip;         /* amount to skip (already rewound if backwards) */
-    int seek;               /* true if seek request pending */
-        /* error information */
-    int err;                /* error code */
-    char *msg;              /* error message */
-        /* zlib inflate or deflate stream */
-    z_stream strm;          /* stream structure in-place (not a pointer) */
-} gz_state;
-typedef gz_state FAR *gz_statep;
-
-/* shared functions */
-void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
-#if defined UNDER_CE
-char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
-#endif
-
-/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
-   value -- needed when comparing unsigned to z_off64_t, which is signed
-   (possible z_off64_t types off_t, off64_t, and long are all signed) */
-#ifdef INT_MAX
-#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
-#else
-unsigned ZLIB_INTERNAL gz_intmax OF((void));
-#  define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
-#endif
diff --git a/src/png/zlib/gzlib.c b/src/png/zlib/gzlib.c
deleted file mode 100644
index 4105e6aff..000000000
--- a/src/png/zlib/gzlib.c
+++ /dev/null
@@ -1,637 +0,0 @@
-/* gzlib.c -- zlib functions common to reading and writing gzip files
- * Copyright (C) 2004-2017 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-#include "gzguts.h"
-
-#if defined(_WIN32) && !defined(__BORLANDC__) && !defined(__MINGW32__)
-#  define LSEEK _lseeki64
-#else
-#if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0
-#  define LSEEK lseek64
-#else
-#  define LSEEK lseek
-#endif
-#endif
-
-/* Local functions */
-local void gz_reset OF((gz_statep));
-local gzFile gz_open OF((const void *, int, const char *));
-
-#if defined UNDER_CE
-
-/* Map the Windows error number in ERROR to a locale-dependent error message
-   string and return a pointer to it.  Typically, the values for ERROR come
-   from GetLastError.
-
-   The string pointed to shall not be modified by the application, but may be
-   overwritten by a subsequent call to gz_strwinerror
-
-   The gz_strwinerror function does not change the current setting of
-   GetLastError. */
-char ZLIB_INTERNAL *gz_strwinerror (error)
-     DWORD error;
-{
-    static char buf[1024];
-
-    wchar_t *msgbuf;
-    DWORD lasterr = GetLastError();
-    DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM
-        | FORMAT_MESSAGE_ALLOCATE_BUFFER,
-        NULL,
-        error,
-        0, /* Default language */
-        (LPVOID)&msgbuf,
-        0,
-        NULL);
-    if (chars != 0) {
-        /* If there is an \r\n appended, zap it.  */
-        if (chars >= 2
-            && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') {
-            chars -= 2;
-            msgbuf[chars] = 0;
-        }
-
-        if (chars > sizeof (buf) - 1) {
-            chars = sizeof (buf) - 1;
-            msgbuf[chars] = 0;
-        }
-
-        wcstombs(buf, msgbuf, chars + 1);
-        LocalFree(msgbuf);
-    }
-    else {
-        sprintf(buf, "unknown win32 error (%ld)", error);
-    }
-
-    SetLastError(lasterr);
-    return buf;
-}
-
-#endif /* UNDER_CE */
-
-/* Reset gzip file state */
-local void gz_reset(state)
-    gz_statep state;
-{
-    state->x.have = 0;              /* no output data available */
-    if (state->mode == GZ_READ) {   /* for reading ... */
-        state->eof = 0;             /* not at end of file */
-        state->past = 0;            /* have not read past end yet */
-        state->how = LOOK;          /* look for gzip header */
-    }
-    state->seek = 0;                /* no seek request pending */
-    gz_error(state, Z_OK, NULL);    /* clear error */
-    state->x.pos = 0;               /* no uncompressed data yet */
-    state->strm.avail_in = 0;       /* no input data yet */
-}
-
-/* Open a gzip file either by name or file descriptor. */
-local gzFile gz_open(path, fd, mode)
-    const void *path;
-    int fd;
-    const char *mode;
-{
-    gz_statep state;
-    z_size_t len;
-    int oflag;
-#ifdef O_CLOEXEC
-    int cloexec = 0;
-#endif
-#ifdef O_EXCL
-    int exclusive = 0;
-#endif
-
-    /* check input */
-    if (path == NULL)
-        return NULL;
-
-    /* allocate gzFile structure to return */
-    state = (gz_statep)malloc(sizeof(gz_state));
-    if (state == NULL)
-        return NULL;
-    state->size = 0;            /* no buffers allocated yet */
-    state->want = GZBUFSIZE;    /* requested buffer size */
-    state->msg = NULL;          /* no error message yet */
-
-    /* interpret mode */
-    state->mode = GZ_NONE;
-    state->level = Z_DEFAULT_COMPRESSION;
-    state->strategy = Z_DEFAULT_STRATEGY;
-    state->direct = 0;
-    while (*mode) {
-        if (*mode >= '0' && *mode <= '9')
-            state->level = *mode - '0';
-        else
-            switch (*mode) {
-            case 'r':
-                state->mode = GZ_READ;
-                break;
-#ifndef NO_GZCOMPRESS
-            case 'w':
-                state->mode = GZ_WRITE;
-                break;
-            case 'a':
-                state->mode = GZ_APPEND;
-                break;
-#endif
-            case '+':       /* can't read and write at the same time */
-                free(state);
-                return NULL;
-            case 'b':       /* ignore -- will request binary anyway */
-                break;
-#ifdef O_CLOEXEC
-            case 'e':
-                cloexec = 1;
-                break;
-#endif
-#ifdef O_EXCL
-            case 'x':
-                exclusive = 1;
-                break;
-#endif
-            case 'f':
-                state->strategy = Z_FILTERED;
-                break;
-            case 'h':
-                state->strategy = Z_HUFFMAN_ONLY;
-                break;
-            case 'R':
-                state->strategy = Z_RLE;
-                break;
-            case 'F':
-                state->strategy = Z_FIXED;
-                break;
-            case 'T':
-                state->direct = 1;
-                break;
-            default:        /* could consider as an error, but just ignore */
-                ;
-            }
-        mode++;
-    }
-
-    /* must provide an "r", "w", or "a" */
-    if (state->mode == GZ_NONE) {
-        free(state);
-        return NULL;
-    }
-
-    /* can't force transparent read */
-    if (state->mode == GZ_READ) {
-        if (state->direct) {
-            free(state);
-            return NULL;
-        }
-        state->direct = 1;      /* for empty file */
-    }
-
-    /* save the path name for error messages */
-#ifdef WIDECHAR
-    if (fd == -2) {
-        len = wcstombs(NULL, path, 0);
-        if (len == (z_size_t)-1)
-            len = 0;
-    }
-    else
-#endif
-        len = strlen((const char *)path);
-    state->path = (char *)malloc(len + 1);
-    if (state->path == NULL) {
-        free(state);
-        return NULL;
-    }
-#ifdef WIDECHAR
-    if (fd == -2)
-        if (len)
-            wcstombs(state->path, path, len + 1);
-        else
-            *(state->path) = 0;
-    else
-#endif
-#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
-        (void)snprintf(state->path, len + 1, "%s", (const char *)path);
-#else
-        strcpy(state->path, path);
-#endif
-
-    /* compute the flags for open() */
-    oflag =
-#ifdef O_LARGEFILE
-        O_LARGEFILE |
-#endif
-#ifdef O_BINARY
-        O_BINARY |
-#endif
-#ifdef O_CLOEXEC
-        (cloexec ? O_CLOEXEC : 0) |
-#endif
-        (state->mode == GZ_READ ?
-         O_RDONLY :
-         (O_WRONLY | O_CREAT |
-#ifdef O_EXCL
-          (exclusive ? O_EXCL : 0) |
-#endif
-          (state->mode == GZ_WRITE ?
-           O_TRUNC :
-           O_APPEND)));
-
-    /* open the file with the appropriate flags (or just use fd) */
-    state->fd = fd > -1 ? fd : (
-#ifdef WIDECHAR
-        fd == -2 ? _wopen(path, oflag, 0666) :
-#endif
-        open((const char *)path, oflag, 0666));
-    if (state->fd == -1) {
-        free(state->path);
-        free(state);
-        return NULL;
-    }
-    if (state->mode == GZ_APPEND) {
-        LSEEK(state->fd, 0, SEEK_END);  /* so gzoffset() is correct */
-        state->mode = GZ_WRITE;         /* simplify later checks */
-    }
-
-    /* save the current position for rewinding (only if reading) */
-    if (state->mode == GZ_READ) {
-        state->start = LSEEK(state->fd, 0, SEEK_CUR);
-        if (state->start == -1) state->start = 0;
-    }
-
-    /* initialize stream */
-    gz_reset(state);
-
-    /* return stream */
-    return (gzFile)state;
-}
-
-/* -- see zlib.h -- */
-gzFile ZEXPORT gzopen(path, mode)
-    const char *path;
-    const char *mode;
-{
-    return gz_open(path, -1, mode);
-}
-
-/* -- see zlib.h -- */
-gzFile ZEXPORT gzopen64(path, mode)
-    const char *path;
-    const char *mode;
-{
-    return gz_open(path, -1, mode);
-}
-
-/* -- see zlib.h -- */
-gzFile ZEXPORT gzdopen(fd, mode)
-    int fd;
-    const char *mode;
-{
-    char *path;         /* identifier for error messages */
-    gzFile gz;
-
-    if (fd == -1 || (path = (char *)malloc(7 + 3 * sizeof(int))) == NULL)
-        return NULL;
-#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
-    (void)snprintf(path, 7 + 3 * sizeof(int), "<fd:%d>", fd);
-#else
-    sprintf(path, "<fd:%d>", fd);   /* for debugging */
-#endif
-    gz = gz_open(path, fd, mode);
-    free(path);
-    return gz;
-}
-
-/* -- see zlib.h -- */
-#ifdef WIDECHAR
-gzFile ZEXPORT gzopen_w(path, mode)
-    const wchar_t *path;
-    const char *mode;
-{
-    return gz_open(path, -2, mode);
-}
-#endif
-
-/* -- see zlib.h -- */
-int ZEXPORT gzbuffer(file, size)
-    gzFile file;
-    unsigned size;
-{
-    gz_statep state;
-
-    /* get internal structure and check integrity */
-    if (file == NULL)
-        return -1;
-    state = (gz_statep)file;
-    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
-        return -1;
-
-    /* make sure we haven't already allocated memory */
-    if (state->size != 0)
-        return -1;
-
-    /* check and set requested size */
-    if ((size << 1) < size)
-        return -1;              /* need to be able to double it */
-    if (size < 2)
-        size = 2;               /* need two bytes to check magic header */
-    state->want = size;
-    return 0;
-}
-
-/* -- see zlib.h -- */
-int ZEXPORT gzrewind(file)
-    gzFile file;
-{
-    gz_statep state;
-
-    /* get internal structure */
-    if (file == NULL)
-        return -1;
-    state = (gz_statep)file;
-
-    /* check that we're reading and that there's no error */
-    if (state->mode != GZ_READ ||
-            (state->err != Z_OK && state->err != Z_BUF_ERROR))
-        return -1;
-
-    /* back up and start over */
-    if (LSEEK(state->fd, state->start, SEEK_SET) == -1)
-        return -1;
-    gz_reset(state);
-    return 0;
-}
-
-/* -- see zlib.h -- */
-z_off64_t ZEXPORT gzseek64(file, offset, whence)
-    gzFile file;
-    z_off64_t offset;
-    int whence;
-{
-    unsigned n;
-    z_off64_t ret;
-    gz_statep state;
-
-    /* get internal structure and check integrity */
-    if (file == NULL)
-        return -1;
-    state = (gz_statep)file;
-    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
-        return -1;
-
-    /* check that there's no error */
-    if (state->err != Z_OK && state->err != Z_BUF_ERROR)
-        return -1;
-
-    /* can only seek from start or relative to current position */
-    if (whence != SEEK_SET && whence != SEEK_CUR)
-        return -1;
-
-    /* normalize offset to a SEEK_CUR specification */
-    if (whence == SEEK_SET)
-        offset -= state->x.pos;
-    else if (state->seek)
-        offset += state->skip;
-    state->seek = 0;
-
-    /* if within raw area while reading, just go there */
-    if (state->mode == GZ_READ && state->how == COPY &&
-            state->x.pos + offset >= 0) {
-        ret = LSEEK(state->fd, offset - state->x.have, SEEK_CUR);
-        if (ret == -1)
-            return -1;
-        state->x.have = 0;
-        state->eof = 0;
-        state->past = 0;
-        state->seek = 0;
-        gz_error(state, Z_OK, NULL);
-        state->strm.avail_in = 0;
-        state->x.pos += offset;
-        return state->x.pos;
-    }
-
-    /* calculate skip amount, rewinding if needed for back seek when reading */
-    if (offset < 0) {
-        if (state->mode != GZ_READ)         /* writing -- can't go backwards */
-            return -1;
-        offset += state->x.pos;
-        if (offset < 0)                     /* before start of file! */
-            return -1;
-        if (gzrewind(file) == -1)           /* rewind, then skip to offset */
-            return -1;
-    }
-
-    /* if reading, skip what's in output buffer (one less gzgetc() check) */
-    if (state->mode == GZ_READ) {
-        n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > offset ?
-            (unsigned)offset : state->x.have;
-        state->x.have -= n;
-        state->x.next += n;
-        state->x.pos += n;
-        offset -= n;
-    }
-
-    /* request skip (if not zero) */
-    if (offset) {
-        state->seek = 1;
-        state->skip = offset;
-    }
-    return state->x.pos + offset;
-}
-
-/* -- see zlib.h -- */
-z_off_t ZEXPORT gzseek(file, offset, whence)
-    gzFile file;
-    z_off_t offset;
-    int whence;
-{
-    z_off64_t ret;
-
-    ret = gzseek64(file, (z_off64_t)offset, whence);
-    return ret == (z_off_t)ret ? (z_off_t)ret : -1;
-}
-
-/* -- see zlib.h -- */
-z_off64_t ZEXPORT gztell64(file)
-    gzFile file;
-{
-    gz_statep state;
-
-    /* get internal structure and check integrity */
-    if (file == NULL)
-        return -1;
-    state = (gz_statep)file;
-    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
-        return -1;
-
-    /* return position */
-    return state->x.pos + (state->seek ? state->skip : 0);
-}
-
-/* -- see zlib.h -- */
-z_off_t ZEXPORT gztell(file)
-    gzFile file;
-{
-    z_off64_t ret;
-
-    ret = gztell64(file);
-    return ret == (z_off_t)ret ? (z_off_t)ret : -1;
-}
-
-/* -- see zlib.h -- */
-z_off64_t ZEXPORT gzoffset64(file)
-    gzFile file;
-{
-    z_off64_t offset;
-    gz_statep state;
-
-    /* get internal structure and check integrity */
-    if (file == NULL)
-        return -1;
-    state = (gz_statep)file;
-    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
-        return -1;
-
-    /* compute and return effective offset in file */
-    offset = LSEEK(state->fd, 0, SEEK_CUR);
-    if (offset == -1)
-        return -1;
-    if (state->mode == GZ_READ)             /* reading */
-        offset -= state->strm.avail_in;     /* don't count buffered input */
-    return offset;
-}
-
-/* -- see zlib.h -- */
-z_off_t ZEXPORT gzoffset(file)
-    gzFile file;
-{
-    z_off64_t ret;
-
-    ret = gzoffset64(file);
-    return ret == (z_off_t)ret ? (z_off_t)ret : -1;
-}
-
-/* -- see zlib.h -- */
-int ZEXPORT gzeof(file)
-    gzFile file;
-{
-    gz_statep state;
-
-    /* get internal structure and check integrity */
-    if (file == NULL)
-        return 0;
-    state = (gz_statep)file;
-    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
-        return 0;
-
-    /* return end-of-file state */
-    return state->mode == GZ_READ ? state->past : 0;
-}
-
-/* -- see zlib.h -- */
-const char * ZEXPORT gzerror(file, errnum)
-    gzFile file;
-    int *errnum;
-{
-    gz_statep state;
-
-    /* get internal structure and check integrity */
-    if (file == NULL)
-        return NULL;
-    state = (gz_statep)file;
-    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
-        return NULL;
-
-    /* return error information */
-    if (errnum != NULL)
-        *errnum = state->err;
-    return state->err == Z_MEM_ERROR ? "out of memory" :
-                                       (state->msg == NULL ? "" : state->msg);
-}
-
-/* -- see zlib.h -- */
-void ZEXPORT gzclearerr(file)
-    gzFile file;
-{
-    gz_statep state;
-
-    /* get internal structure and check integrity */
-    if (file == NULL)
-        return;
-    state = (gz_statep)file;
-    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
-        return;
-
-    /* clear error and end-of-file */
-    if (state->mode == GZ_READ) {
-        state->eof = 0;
-        state->past = 0;
-    }
-    gz_error(state, Z_OK, NULL);
-}
-
-/* Create an error message in allocated memory and set state->err and
-   state->msg accordingly.  Free any previous error message already there.  Do
-   not try to free or allocate space if the error is Z_MEM_ERROR (out of
-   memory).  Simply save the error message as a static string.  If there is an
-   allocation failure constructing the error message, then convert the error to
-   out of memory. */
-void ZLIB_INTERNAL gz_error(state, err, msg)
-    gz_statep state;
-    int err;
-    const char *msg;
-{
-    /* free previously allocated message and clear */
-    if (state->msg != NULL) {
-        if (state->err != Z_MEM_ERROR)
-            free(state->msg);
-        state->msg = NULL;
-    }
-
-    /* if fatal, set state->x.have to 0 so that the gzgetc() macro fails */
-    if (err != Z_OK && err != Z_BUF_ERROR)
-        state->x.have = 0;
-
-    /* set error code, and if no message, then done */
-    state->err = err;
-    if (msg == NULL)
-        return;
-
-    /* for an out of memory error, return literal string when requested */
-    if (err == Z_MEM_ERROR)
-        return;
-
-    /* construct error message with path */
-    if ((state->msg = (char *)malloc(strlen(state->path) + strlen(msg) + 3)) ==
-            NULL) {
-        state->err = Z_MEM_ERROR;
-        return;
-    }
-#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
-    (void)snprintf(state->msg, strlen(state->path) + strlen(msg) + 3,
-                   "%s%s%s", state->path, ": ", msg);
-#else
-    strcpy(state->msg, state->path);
-    strcat(state->msg, ": ");
-    strcat(state->msg, msg);
-#endif
-}
-
-#ifndef INT_MAX
-/* portably return maximum value for an int (when limits.h presumed not
-   available) -- we need to do this to cover cases where 2's complement not
-   used, since C standard permits 1's complement and sign-bit representations,
-   otherwise we could just use ((unsigned)-1) >> 1 */
-unsigned ZLIB_INTERNAL gz_intmax()
-{
-    unsigned p, q;
-
-    p = 1;
-    do {
-        q = p;
-        p <<= 1;
-        p++;
-    } while (p > q);
-    return q >> 1;
-}
-#endif
diff --git a/src/png/zlib/gzread.c b/src/png/zlib/gzread.c
deleted file mode 100644
index 956b91ea7..000000000
--- a/src/png/zlib/gzread.c
+++ /dev/null
@@ -1,654 +0,0 @@
-/* gzread.c -- zlib functions for reading gzip files
- * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-#include "gzguts.h"
-
-/* Local functions */
-local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *));
-local int gz_avail OF((gz_statep));
-local int gz_look OF((gz_statep));
-local int gz_decomp OF((gz_statep));
-local int gz_fetch OF((gz_statep));
-local int gz_skip OF((gz_statep, z_off64_t));
-local z_size_t gz_read OF((gz_statep, voidp, z_size_t));
-
-/* Use read() to load a buffer -- return -1 on error, otherwise 0.  Read from
-   state->fd, and update state->eof, state->err, and state->msg as appropriate.
-   This function needs to loop on read(), since read() is not guaranteed to
-   read the number of bytes requested, depending on the type of descriptor. */
-local int gz_load(state, buf, len, have)
-    gz_statep state;
-    unsigned char *buf;
-    unsigned len;
-    unsigned *have;
-{
-    int ret;
-    unsigned get, max = ((unsigned)-1 >> 2) + 1;
-
-    *have = 0;
-    do {
-        get = len - *have;
-        if (get > max)
-            get = max;
-        ret = read(state->fd, buf + *have, get);
-        if (ret <= 0)
-            break;
-        *have += (unsigned)ret;
-    } while (*have < len);
-    if (ret < 0) {
-        gz_error(state, Z_ERRNO, zstrerror());
-        return -1;
-    }
-    if (ret == 0)
-        state->eof = 1;
-    return 0;
-}
-
-/* Load up input buffer and set eof flag if last data loaded -- return -1 on
-   error, 0 otherwise.  Note that the eof flag is set when the end of the input
-   file is reached, even though there may be unused data in the buffer.  Once
-   that data has been used, no more attempts will be made to read the file.
-   If strm->avail_in != 0, then the current data is moved to the beginning of
-   the input buffer, and then the remainder of the buffer is loaded with the
-   available data from the input file. */
-local int gz_avail(state)
-    gz_statep state;
-{
-    unsigned got;
-    z_streamp strm = &(state->strm);
-
-    if (state->err != Z_OK && state->err != Z_BUF_ERROR)
-        return -1;
-    if (state->eof == 0) {
-        if (strm->avail_in) {       /* copy what's there to the start */
-            unsigned char *p = state->in;
-            unsigned const char *q = strm->next_in;
-            unsigned n = strm->avail_in;
-            do {
-                *p++ = *q++;
-            } while (--n);
-        }
-        if (gz_load(state, state->in + strm->avail_in,
-                    state->size - strm->avail_in, &got) == -1)
-            return -1;
-        strm->avail_in += got;
-        strm->next_in = state->in;
-    }
-    return 0;
-}
-
-/* Look for gzip header, set up for inflate or copy.  state->x.have must be 0.
-   If this is the first time in, allocate required memory.  state->how will be
-   left unchanged if there is no more input data available, will be set to COPY
-   if there is no gzip header and direct copying will be performed, or it will
-   be set to GZIP for decompression.  If direct copying, then leftover input
-   data from the input buffer will be copied to the output buffer.  In that
-   case, all further file reads will be directly to either the output buffer or
-   a user buffer.  If decompressing, the inflate state will be initialized.
-   gz_look() will return 0 on success or -1 on failure. */
-local int gz_look(state)
-    gz_statep state;
-{
-    z_streamp strm = &(state->strm);
-
-    /* allocate read buffers and inflate memory */
-    if (state->size == 0) {
-        /* allocate buffers */
-        state->in = (unsigned char *)malloc(state->want);
-        state->out = (unsigned char *)malloc(state->want << 1);
-        if (state->in == NULL || state->out == NULL) {
-            free(state->out);
-            free(state->in);
-            gz_error(state, Z_MEM_ERROR, "out of memory");
-            return -1;
-        }
-        state->size = state->want;
-
-        /* allocate inflate memory */
-        state->strm.zalloc = Z_NULL;
-        state->strm.zfree = Z_NULL;
-        state->strm.opaque = Z_NULL;
-        state->strm.avail_in = 0;
-        state->strm.next_in = Z_NULL;
-        if (inflateInit2(&(state->strm), 15 + 16) != Z_OK) {    /* gunzip */
-            free(state->out);
-            free(state->in);
-            state->size = 0;
-            gz_error(state, Z_MEM_ERROR, "out of memory");
-            return -1;
-        }
-    }
-
-    /* get at least the magic bytes in the input buffer */
-    if (strm->avail_in < 2) {
-        if (gz_avail(state) == -1)
-            return -1;
-        if (strm->avail_in == 0)
-            return 0;
-    }
-
-    /* look for gzip magic bytes -- if there, do gzip decoding (note: there is
-       a logical dilemma here when considering the case of a partially written
-       gzip file, to wit, if a single 31 byte is written, then we cannot tell
-       whether this is a single-byte file, or just a partially written gzip
-       file -- for here we assume that if a gzip file is being written, then
-       the header will be written in a single operation, so that reading a
-       single byte is sufficient indication that it is not a gzip file) */
-    if (strm->avail_in > 1 &&
-            strm->next_in[0] == 31 && strm->next_in[1] == 139) {
-        inflateReset(strm);
-        state->how = GZIP;
-        state->direct = 0;
-        return 0;
-    }
-
-    /* no gzip header -- if we were decoding gzip before, then this is trailing
-       garbage.  Ignore the trailing garbage and finish. */
-    if (state->direct == 0) {
-        strm->avail_in = 0;
-        state->eof = 1;
-        state->x.have = 0;
-        return 0;
-    }
-
-    /* doing raw i/o, copy any leftover input to output -- this assumes that
-       the output buffer is larger than the input buffer, which also assures
-       space for gzungetc() */
-    state->x.next = state->out;
-    if (strm->avail_in) {
-        memcpy(state->x.next, strm->next_in, strm->avail_in);
-        state->x.have = strm->avail_in;
-        strm->avail_in = 0;
-    }
-    state->how = COPY;
-    state->direct = 1;
-    return 0;
-}
-
-/* Decompress from input to the provided next_out and avail_out in the state.
-   On return, state->x.have and state->x.next point to the just decompressed
-   data.  If the gzip stream completes, state->how is reset to LOOK to look for
-   the next gzip stream or raw data, once state->x.have is depleted.  Returns 0
-   on success, -1 on failure. */
-local int gz_decomp(state)
-    gz_statep state;
-{
-    int ret = Z_OK;
-    unsigned had;
-    z_streamp strm = &(state->strm);
-
-    /* fill output buffer up to end of deflate stream */
-    had = strm->avail_out;
-    do {
-        /* get more input for inflate() */
-        if (strm->avail_in == 0 && gz_avail(state) == -1)
-            return -1;
-        if (strm->avail_in == 0) {
-            gz_error(state, Z_BUF_ERROR, "unexpected end of file");
-            break;
-        }
-
-        /* decompress and handle errors */
-        ret = inflate(strm, Z_NO_FLUSH);
-        if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) {
-            gz_error(state, Z_STREAM_ERROR,
-                     "internal error: inflate stream corrupt");
-            return -1;
-        }
-        if (ret == Z_MEM_ERROR) {
-            gz_error(state, Z_MEM_ERROR, "out of memory");
-            return -1;
-        }
-        if (ret == Z_DATA_ERROR) {              /* deflate stream invalid */
-            gz_error(state, Z_DATA_ERROR,
-                     strm->msg == NULL ? "compressed data error" : strm->msg);
-            return -1;
-        }
-    } while (strm->avail_out && ret != Z_STREAM_END);
-
-    /* update available output */
-    state->x.have = had - strm->avail_out;
-    state->x.next = strm->next_out - state->x.have;
-
-    /* if the gzip stream completed successfully, look for another */
-    if (ret == Z_STREAM_END)
-        state->how = LOOK;
-
-    /* good decompression */
-    return 0;
-}
-
-/* Fetch data and put it in the output buffer.  Assumes state->x.have is 0.
-   Data is either copied from the input file or decompressed from the input
-   file depending on state->how.  If state->how is LOOK, then a gzip header is
-   looked for to determine whether to copy or decompress.  Returns -1 on error,
-   otherwise 0.  gz_fetch() will leave state->how as COPY or GZIP unless the
-   end of the input file has been reached and all data has been processed.  */
-local int gz_fetch(state)
-    gz_statep state;
-{
-    z_streamp strm = &(state->strm);
-
-    do {
-        switch(state->how) {
-        case LOOK:      /* -> LOOK, COPY (only if never GZIP), or GZIP */
-            if (gz_look(state) == -1)
-                return -1;
-            if (state->how == LOOK)
-                return 0;
-            break;
-        case COPY:      /* -> COPY */
-            if (gz_load(state, state->out, state->size << 1, &(state->x.have))
-                    == -1)
-                return -1;
-            state->x.next = state->out;
-            return 0;
-        case GZIP:      /* -> GZIP or LOOK (if end of gzip stream) */
-            strm->avail_out = state->size << 1;
-            strm->next_out = state->out;
-            if (gz_decomp(state) == -1)
-                return -1;
-        }
-    } while (state->x.have == 0 && (!state->eof || strm->avail_in));
-    return 0;
-}
-
-/* Skip len uncompressed bytes of output.  Return -1 on error, 0 on success. */
-local int gz_skip(state, len)
-    gz_statep state;
-    z_off64_t len;
-{
-    unsigned n;
-
-    /* skip over len bytes or reach end-of-file, whichever comes first */
-    while (len)
-        /* skip over whatever is in output buffer */
-        if (state->x.have) {
-            n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > len ?
-                (unsigned)len : state->x.have;
-            state->x.have -= n;
-            state->x.next += n;
-            state->x.pos += n;
-            len -= n;
-        }
-
-        /* output buffer empty -- return if we're at the end of the input */
-        else if (state->eof && state->strm.avail_in == 0)
-            break;
-
-        /* need more data to skip -- load up output buffer */
-        else {
-            /* get more output, looking for header if required */
-            if (gz_fetch(state) == -1)
-                return -1;
-        }
-    return 0;
-}
-
-/* Read len bytes into buf from file, or less than len up to the end of the
-   input.  Return the number of bytes read.  If zero is returned, either the
-   end of file was reached, or there was an error.  state->err must be
-   consulted in that case to determine which. */
-local z_size_t gz_read(state, buf, len)
-    gz_statep state;
-    voidp buf;
-    z_size_t len;
-{
-    z_size_t got;
-    unsigned n;
-
-    /* if len is zero, avoid unnecessary operations */
-    if (len == 0)
-        return 0;
-
-    /* process a skip request */
-    if (state->seek) {
-        state->seek = 0;
-        if (gz_skip(state, state->skip) == -1)
-            return 0;
-    }
-
-    /* get len bytes to buf, or less than len if at the end */
-    got = 0;
-    do {
-        /* set n to the maximum amount of len that fits in an unsigned int */
-        n = -1;
-        if (n > len)
-            n = len;
-
-        /* first just try copying data from the output buffer */
-        if (state->x.have) {
-            if (state->x.have < n)
-                n = state->x.have;
-            memcpy(buf, state->x.next, n);
-            state->x.next += n;
-            state->x.have -= n;
-        }
-
-        /* output buffer empty -- return if we're at the end of the input */
-        else if (state->eof && state->strm.avail_in == 0) {
-            state->past = 1;        /* tried to read past end */
-            break;
-        }
-
-        /* need output data -- for small len or new stream load up our output
-           buffer */
-        else if (state->how == LOOK || n < (state->size << 1)) {
-            /* get more output, looking for header if required */
-            if (gz_fetch(state) == -1)
-                return 0;
-            continue;       /* no progress yet -- go back to copy above */
-            /* the copy above assures that we will leave with space in the
-               output buffer, allowing at least one gzungetc() to succeed */
-        }
-
-        /* large len -- read directly into user buffer */
-        else if (state->how == COPY) {      /* read directly */
-            if (gz_load(state, (unsigned char *)buf, n, &n) == -1)
-                return 0;
-        }
-
-        /* large len -- decompress directly into user buffer */
-        else {  /* state->how == GZIP */
-            state->strm.avail_out = n;
-            state->strm.next_out = (unsigned char *)buf;
-            if (gz_decomp(state) == -1)
-                return 0;
-            n = state->x.have;
-            state->x.have = 0;
-        }
-
-        /* update progress */
-        len -= n;
-        buf = (char *)buf + n;
-        got += n;
-        state->x.pos += n;
-    } while (len);
-
-    /* return number of bytes read into user buffer */
-    return got;
-}
-
-/* -- see zlib.h -- */
-int ZEXPORT gzread(file, buf, len)
-    gzFile file;
-    voidp buf;
-    unsigned len;
-{
-    gz_statep state;
-
-    /* get internal structure */
-    if (file == NULL)
-        return -1;
-    state = (gz_statep)file;
-
-    /* check that we're reading and that there's no (serious) error */
-    if (state->mode != GZ_READ ||
-            (state->err != Z_OK && state->err != Z_BUF_ERROR))
-        return -1;
-
-    /* since an int is returned, make sure len fits in one, otherwise return
-       with an error (this avoids a flaw in the interface) */
-    if ((int)len < 0) {
-        gz_error(state, Z_STREAM_ERROR, "request does not fit in an int");
-        return -1;
-    }
-
-    /* read len or fewer bytes to buf */
-    len = gz_read(state, buf, len);
-
-    /* check for an error */
-    if (len == 0 && state->err != Z_OK && state->err != Z_BUF_ERROR)
-        return -1;
-
-    /* return the number of bytes read (this is assured to fit in an int) */
-    return (int)len;
-}
-
-/* -- see zlib.h -- */
-z_size_t ZEXPORT gzfread(buf, size, nitems, file)
-    voidp buf;
-    z_size_t size;
-    z_size_t nitems;
-    gzFile file;
-{
-    z_size_t len;
-    gz_statep state;
-
-    /* get internal structure */
-    if (file == NULL)
-        return 0;
-    state = (gz_statep)file;
-
-    /* check that we're reading and that there's no (serious) error */
-    if (state->mode != GZ_READ ||
-            (state->err != Z_OK && state->err != Z_BUF_ERROR))
-        return 0;
-
-    /* compute bytes to read -- error on overflow */
-    len = nitems * size;
-    if (size && len / size != nitems) {
-        gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
-        return 0;
-    }
-
-    /* read len or fewer bytes to buf, return the number of full items read */
-    return len ? gz_read(state, buf, len) / size : 0;
-}
-
-/* -- see zlib.h -- */
-#ifdef Z_PREFIX_SET
-#  undef z_gzgetc
-#else
-#  undef gzgetc
-#endif
-int ZEXPORT gzgetc(file)
-    gzFile file;
-{
-    int ret;
-    unsigned char buf[1];
-    gz_statep state;
-
-    /* get internal structure */
-    if (file == NULL)
-        return -1;
-    state = (gz_statep)file;
-
-    /* check that we're reading and that there's no (serious) error */
-    if (state->mode != GZ_READ ||
-        (state->err != Z_OK && state->err != Z_BUF_ERROR))
-        return -1;
-
-    /* try output buffer (no need to check for skip request) */
-    if (state->x.have) {
-        state->x.have--;
-        state->x.pos++;
-        return *(state->x.next)++;
-    }
-
-    /* nothing there -- try gz_read() */
-    ret = gz_read(state, buf, 1);
-    return ret < 1 ? -1 : buf[0];
-}
-
-int ZEXPORT gzgetc_(file)
-gzFile file;
-{
-    return gzgetc(file);
-}
-
-/* -- see zlib.h -- */
-int ZEXPORT gzungetc(c, file)
-    int c;
-    gzFile file;
-{
-    gz_statep state;
-
-    /* get internal structure */
-    if (file == NULL)
-        return -1;
-    state = (gz_statep)file;
-
-    /* check that we're reading and that there's no (serious) error */
-    if (state->mode != GZ_READ ||
-        (state->err != Z_OK && state->err != Z_BUF_ERROR))
-        return -1;
-
-    /* process a skip request */
-    if (state->seek) {
-        state->seek = 0;
-        if (gz_skip(state, state->skip) == -1)
-            return -1;
-    }
-
-    /* can't push EOF */
-    if (c < 0)
-        return -1;
-
-    /* if output buffer empty, put byte at end (allows more pushing) */
-    if (state->x.have == 0) {
-        state->x.have = 1;
-        state->x.next = state->out + (state->size << 1) - 1;
-        state->x.next[0] = (unsigned char)c;
-        state->x.pos--;
-        state->past = 0;
-        return c;
-    }
-
-    /* if no room, give up (must have already done a gzungetc()) */
-    if (state->x.have == (state->size << 1)) {
-        gz_error(state, Z_DATA_ERROR, "out of room to push characters");
-        return -1;
-    }
-
-    /* slide output data if needed and insert byte before existing data */
-    if (state->x.next == state->out) {
-        unsigned char *src = state->out + state->x.have;
-        unsigned char *dest = state->out + (state->size << 1);
-        while (src > state->out)
-            *--dest = *--src;
-        state->x.next = dest;
-    }
-    state->x.have++;
-    state->x.next--;
-    state->x.next[0] = (unsigned char)c;
-    state->x.pos--;
-    state->past = 0;
-    return c;
-}
-
-/* -- see zlib.h -- */
-char * ZEXPORT gzgets(file, buf, len)
-    gzFile file;
-    char *buf;
-    int len;
-{
-    unsigned left, n;
-    char *str;
-    unsigned char *eol;
-    gz_statep state;
-
-    /* check parameters and get internal structure */
-    if (file == NULL || buf == NULL || len < 1)
-        return NULL;
-    state = (gz_statep)file;
-
-    /* check that we're reading and that there's no (serious) error */
-    if (state->mode != GZ_READ ||
-        (state->err != Z_OK && state->err != Z_BUF_ERROR))
-        return NULL;
-
-    /* process a skip request */
-    if (state->seek) {
-        state->seek = 0;
-        if (gz_skip(state, state->skip) == -1)
-            return NULL;
-    }
-
-    /* copy output bytes up to new line or len - 1, whichever comes first --
-       append a terminating zero to the string (we don't check for a zero in
-       the contents, let the user worry about that) */
-    str = buf;
-    left = (unsigned)len - 1;
-    if (left) do {
-        /* assure that something is in the output buffer */
-        if (state->x.have == 0 && gz_fetch(state) == -1)
-            return NULL;                /* error */
-        if (state->x.have == 0) {       /* end of file */
-            state->past = 1;            /* read past end */
-            break;                      /* return what we have */
-        }
-
-        /* look for end-of-line in current output buffer */
-        n = state->x.have > left ? left : state->x.have;
-        eol = (unsigned char *)memchr(state->x.next, '\n', n);
-        if (eol != NULL)
-            n = (unsigned)(eol - state->x.next) + 1;
-
-        /* copy through end-of-line, or remainder if not found */
-        memcpy(buf, state->x.next, n);
-        state->x.have -= n;
-        state->x.next += n;
-        state->x.pos += n;
-        left -= n;
-        buf += n;
-    } while (left && eol == NULL);
-
-    /* return terminated string, or if nothing, end of file */
-    if (buf == str)
-        return NULL;
-    buf[0] = 0;
-    return str;
-}
-
-/* -- see zlib.h -- */
-int ZEXPORT gzdirect(file)
-    gzFile file;
-{
-    gz_statep state;
-
-    /* get internal structure */
-    if (file == NULL)
-        return 0;
-    state = (gz_statep)file;
-
-    /* if the state is not known, but we can find out, then do so (this is
-       mainly for right after a gzopen() or gzdopen()) */
-    if (state->mode == GZ_READ && state->how == LOOK && state->x.have == 0)
-        (void)gz_look(state);
-
-    /* return 1 if transparent, 0 if processing a gzip stream */
-    return state->direct;
-}
-
-/* -- see zlib.h -- */
-int ZEXPORT gzclose_r(file)
-    gzFile file;
-{
-    int ret, err;
-    gz_statep state;
-
-    /* get internal structure */
-    if (file == NULL)
-        return Z_STREAM_ERROR;
-    state = (gz_statep)file;
-
-    /* check that we're reading */
-    if (state->mode != GZ_READ)
-        return Z_STREAM_ERROR;
-
-    /* free memory and close file */
-    if (state->size) {
-        inflateEnd(&(state->strm));
-        free(state->out);
-        free(state->in);
-    }
-    err = state->err == Z_BUF_ERROR ? Z_BUF_ERROR : Z_OK;
-    gz_error(state, Z_OK, NULL);
-    free(state->path);
-    ret = close(state->fd);
-    free(state);
-    return ret ? Z_ERRNO : err;
-}
diff --git a/src/png/zlib/gzwrite.c b/src/png/zlib/gzwrite.c
deleted file mode 100644
index c7b5651d7..000000000
--- a/src/png/zlib/gzwrite.c
+++ /dev/null
@@ -1,665 +0,0 @@
-/* gzwrite.c -- zlib functions for writing gzip files
- * Copyright (C) 2004-2017 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-#include "gzguts.h"
-
-/* Local functions */
-local int gz_init OF((gz_statep));
-local int gz_comp OF((gz_statep, int));
-local int gz_zero OF((gz_statep, z_off64_t));
-local z_size_t gz_write OF((gz_statep, voidpc, z_size_t));
-
-/* Initialize state for writing a gzip file.  Mark initialization by setting
-   state->size to non-zero.  Return -1 on a memory allocation failure, or 0 on
-   success. */
-local int gz_init(state)
-    gz_statep state;
-{
-    int ret;
-    z_streamp strm = &(state->strm);
-
-    /* allocate input buffer (double size for gzprintf) */
-    state->in = (unsigned char *)malloc(state->want << 1);
-    if (state->in == NULL) {
-        gz_error(state, Z_MEM_ERROR, "out of memory");
-        return -1;
-    }
-
-    /* only need output buffer and deflate state if compressing */
-    if (!state->direct) {
-        /* allocate output buffer */
-        state->out = (unsigned char *)malloc(state->want);
-        if (state->out == NULL) {
-            free(state->in);
-            gz_error(state, Z_MEM_ERROR, "out of memory");
-            return -1;
-        }
-
-        /* allocate deflate memory, set up for gzip compression */
-        strm->zalloc = Z_NULL;
-        strm->zfree = Z_NULL;
-        strm->opaque = Z_NULL;
-        ret = deflateInit2(strm, state->level, Z_DEFLATED,
-                           MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
-        if (ret != Z_OK) {
-            free(state->out);
-            free(state->in);
-            gz_error(state, Z_MEM_ERROR, "out of memory");
-            return -1;
-        }
-        strm->next_in = NULL;
-    }
-
-    /* mark state as initialized */
-    state->size = state->want;
-
-    /* initialize write buffer if compressing */
-    if (!state->direct) {
-        strm->avail_out = state->size;
-        strm->next_out = state->out;
-        state->x.next = strm->next_out;
-    }
-    return 0;
-}
-
-/* Compress whatever is at avail_in and next_in and write to the output file.
-   Return -1 if there is an error writing to the output file or if gz_init()
-   fails to allocate memory, otherwise 0.  flush is assumed to be a valid
-   deflate() flush value.  If flush is Z_FINISH, then the deflate() state is
-   reset to start a new gzip stream.  If gz->direct is true, then simply write
-   to the output file without compressing, and ignore flush. */
-local int gz_comp(state, flush)
-    gz_statep state;
-    int flush;
-{
-    int ret, writ;
-    unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
-    z_streamp strm = &(state->strm);
-
-    /* allocate memory if this is the first time through */
-    if (state->size == 0 && gz_init(state) == -1)
-        return -1;
-
-    /* write directly if requested */
-    if (state->direct) {
-        while (strm->avail_in) {
-            put = strm->avail_in > max ? max : strm->avail_in;
-            writ = write(state->fd, strm->next_in, put);
-            if (writ < 0) {
-                gz_error(state, Z_ERRNO, zstrerror());
-                return -1;
-            }
-            strm->avail_in -= (unsigned)writ;
-            strm->next_in += writ;
-        }
-        return 0;
-    }
-
-    /* run deflate() on provided input until it produces no more output */
-    ret = Z_OK;
-    do {
-        /* write out current buffer contents if full, or if flushing, but if
-           doing Z_FINISH then don't write until we get to Z_STREAM_END */
-        if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
-            (flush != Z_FINISH || ret == Z_STREAM_END))) {
-            while (strm->next_out > state->x.next) {
-                put = strm->next_out - state->x.next > (int)max ? max :
-                      (unsigned)(strm->next_out - state->x.next);
-                writ = write(state->fd, state->x.next, put);
-                if (writ < 0) {
-                    gz_error(state, Z_ERRNO, zstrerror());
-                    return -1;
-                }
-                state->x.next += writ;
-            }
-            if (strm->avail_out == 0) {
-                strm->avail_out = state->size;
-                strm->next_out = state->out;
-                state->x.next = state->out;
-            }
-        }
-
-        /* compress */
-        have = strm->avail_out;
-        ret = deflate(strm, flush);
-        if (ret == Z_STREAM_ERROR) {
-            gz_error(state, Z_STREAM_ERROR,
-                      "internal error: deflate stream corrupt");
-            return -1;
-        }
-        have -= strm->avail_out;
-    } while (have);
-
-    /* if that completed a deflate stream, allow another to start */
-    if (flush == Z_FINISH)
-        deflateReset(strm);
-
-    /* all done, no errors */
-    return 0;
-}
-
-/* Compress len zeros to output.  Return -1 on a write error or memory
-   allocation failure by gz_comp(), or 0 on success. */
-local int gz_zero(state, len)
-    gz_statep state;
-    z_off64_t len;
-{
-    int first;
-    unsigned n;
-    z_streamp strm = &(state->strm);
-
-    /* consume whatever's left in the input buffer */
-    if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
-        return -1;
-
-    /* compress len zeros (len guaranteed > 0) */
-    first = 1;
-    while (len) {
-        n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
-            (unsigned)len : state->size;
-        if (first) {
-            memset(state->in, 0, n);
-            first = 0;
-        }
-        strm->avail_in = n;
-        strm->next_in = state->in;
-        state->x.pos += n;
-        if (gz_comp(state, Z_NO_FLUSH) == -1)
-            return -1;
-        len -= n;
-    }
-    return 0;
-}
-
-/* Write len bytes from buf to file.  Return the number of bytes written.  If
-   the returned value is less than len, then there was an error. */
-local z_size_t gz_write(state, buf, len)
-    gz_statep state;
-    voidpc buf;
-    z_size_t len;
-{
-    z_size_t put = len;
-
-    /* if len is zero, avoid unnecessary operations */
-    if (len == 0)
-        return 0;
-
-    /* allocate memory if this is the first time through */
-    if (state->size == 0 && gz_init(state) == -1)
-        return 0;
-
-    /* check for seek request */
-    if (state->seek) {
-        state->seek = 0;
-        if (gz_zero(state, state->skip) == -1)
-            return 0;
-    }
-
-    /* for small len, copy to input buffer, otherwise compress directly */
-    if (len < state->size) {
-        /* copy to input buffer, compress when full */
-        do {
-            unsigned have, copy;
-
-            if (state->strm.avail_in == 0)
-                state->strm.next_in = state->in;
-            have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
-                              state->in);
-            copy = state->size - have;
-            if (copy > len)
-                copy = len;
-            memcpy(state->in + have, buf, copy);
-            state->strm.avail_in += copy;
-            state->x.pos += copy;
-            buf = (const char *)buf + copy;
-            len -= copy;
-            if (len && gz_comp(state, Z_NO_FLUSH) == -1)
-                return 0;
-        } while (len);
-    }
-    else {
-        /* consume whatever's left in the input buffer */
-        if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
-            return 0;
-
-        /* directly compress user buffer to file */
-        state->strm.next_in = (z_const Bytef *)buf;
-        do {
-            unsigned n = (unsigned)-1;
-            if (n > len)
-                n = len;
-            state->strm.avail_in = n;
-            state->x.pos += n;
-            if (gz_comp(state, Z_NO_FLUSH) == -1)
-                return 0;
-            len -= n;
-        } while (len);
-    }
-
-    /* input was all buffered or compressed */
-    return put;
-}
-
-/* -- see zlib.h -- */
-int ZEXPORT gzwrite(file, buf, len)
-    gzFile file;
-    voidpc buf;
-    unsigned len;
-{
-    gz_statep state;
-
-    /* get internal structure */
-    if (file == NULL)
-        return 0;
-    state = (gz_statep)file;
-
-    /* check that we're writing and that there's no error */
-    if (state->mode != GZ_WRITE || state->err != Z_OK)
-        return 0;
-
-    /* since an int is returned, make sure len fits in one, otherwise return
-       with an error (this avoids a flaw in the interface) */
-    if ((int)len < 0) {
-        gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
-        return 0;
-    }
-
-    /* write len bytes from buf (the return value will fit in an int) */
-    return (int)gz_write(state, buf, len);
-}
-
-/* -- see zlib.h -- */
-z_size_t ZEXPORT gzfwrite(buf, size, nitems, file)
-    voidpc buf;
-    z_size_t size;
-    z_size_t nitems;
-    gzFile file;
-{
-    z_size_t len;
-    gz_statep state;
-
-    /* get internal structure */
-    if (file == NULL)
-        return 0;
-    state = (gz_statep)file;
-
-    /* check that we're writing and that there's no error */
-    if (state->mode != GZ_WRITE || state->err != Z_OK)
-        return 0;
-
-    /* compute bytes to read -- error on overflow */
-    len = nitems * size;
-    if (size && len / size != nitems) {
-        gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
-        return 0;
-    }
-
-    /* write len bytes to buf, return the number of full items written */
-    return len ? gz_write(state, buf, len) / size : 0;
-}
-
-/* -- see zlib.h -- */
-int ZEXPORT gzputc(file, c)
-    gzFile file;
-    int c;
-{
-    unsigned have;
-    unsigned char buf[1];
-    gz_statep state;
-    z_streamp strm;
-
-    /* get internal structure */
-    if (file == NULL)
-        return -1;
-    state = (gz_statep)file;
-    strm = &(state->strm);
-
-    /* check that we're writing and that there's no error */
-    if (state->mode != GZ_WRITE || state->err != Z_OK)
-        return -1;
-
-    /* check for seek request */
-    if (state->seek) {
-        state->seek = 0;
-        if (gz_zero(state, state->skip) == -1)
-            return -1;
-    }
-
-    /* try writing to input buffer for speed (state->size == 0 if buffer not
-       initialized) */
-    if (state->size) {
-        if (strm->avail_in == 0)
-            strm->next_in = state->in;
-        have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
-        if (have < state->size) {
-            state->in[have] = (unsigned char)c;
-            strm->avail_in++;
-            state->x.pos++;
-            return c & 0xff;
-        }
-    }
-
-    /* no room in buffer or not initialized, use gz_write() */
-    buf[0] = (unsigned char)c;
-    if (gz_write(state, buf, 1) != 1)
-        return -1;
-    return c & 0xff;
-}
-
-/* -- see zlib.h -- */
-int ZEXPORT gzputs(file, str)
-    gzFile file;
-    const char *str;
-{
-    int ret;
-    z_size_t len;
-    gz_statep state;
-
-    /* get internal structure */
-    if (file == NULL)
-        return -1;
-    state = (gz_statep)file;
-
-    /* check that we're writing and that there's no error */
-    if (state->mode != GZ_WRITE || state->err != Z_OK)
-        return -1;
-
-    /* write string */
-    len = strlen(str);
-    ret = gz_write(state, str, len);
-    return ret == 0 && len != 0 ? -1 : ret;
-}
-
-#if defined(STDC) || defined(Z_HAVE_STDARG_H)
-#include <stdarg.h>
-
-/* -- see zlib.h -- */
-int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
-{
-    int len;
-    unsigned left;
-    char *next;
-    gz_statep state;
-    z_streamp strm;
-
-    /* get internal structure */
-    if (file == NULL)
-        return Z_STREAM_ERROR;
-    state = (gz_statep)file;
-    strm = &(state->strm);
-
-    /* check that we're writing and that there's no error */
-    if (state->mode != GZ_WRITE || state->err != Z_OK)
-        return Z_STREAM_ERROR;
-
-    /* make sure we have some buffer space */
-    if (state->size == 0 && gz_init(state) == -1)
-        return state->err;
-
-    /* check for seek request */
-    if (state->seek) {
-        state->seek = 0;
-        if (gz_zero(state, state->skip) == -1)
-            return state->err;
-    }
-
-    /* do the printf() into the input buffer, put length in len -- the input
-       buffer is double-sized just for this function, so there is guaranteed to
-       be state->size bytes available after the current contents */
-    if (strm->avail_in == 0)
-        strm->next_in = state->in;
-    next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
-    next[state->size - 1] = 0;
-#ifdef NO_vsnprintf
-#  ifdef HAS_vsprintf_void
-    (void)vsprintf(next, format, va);
-    for (len = 0; len < state->size; len++)
-        if (next[len] == 0) break;
-#  else
-    len = vsprintf(next, format, va);
-#  endif
-#else
-#  ifdef HAS_vsnprintf_void
-    (void)vsnprintf(next, state->size, format, va);
-    len = strlen(next);
-#  else
-    len = vsnprintf(next, state->size, format, va);
-#  endif
-#endif
-
-    /* check that printf() results fit in buffer */
-    if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
-        return 0;
-
-    /* update buffer and position, compress first half if past that */
-    strm->avail_in += (unsigned)len;
-    state->x.pos += len;
-    if (strm->avail_in >= state->size) {
-        left = strm->avail_in - state->size;
-        strm->avail_in = state->size;
-        if (gz_comp(state, Z_NO_FLUSH) == -1)
-            return state->err;
-        memcpy(state->in, state->in + state->size, left);
-        strm->next_in = state->in;
-        strm->avail_in = left;
-    }
-    return len;
-}
-
-int ZEXPORTVA gzprintf(gzFile file, const char *format, ...)
-{
-    va_list va;
-    int ret;
-
-    va_start(va, format);
-    ret = gzvprintf(file, format, va);
-    va_end(va);
-    return ret;
-}
-
-#else /* !STDC && !Z_HAVE_STDARG_H */
-
-/* -- see zlib.h -- */
-int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
-                       a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
-    gzFile file;
-    const char *format;
-    int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
-        a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
-{
-    unsigned len, left;
-    char *next;
-    gz_statep state;
-    z_streamp strm;
-
-    /* get internal structure */
-    if (file == NULL)
-        return Z_STREAM_ERROR;
-    state = (gz_statep)file;
-    strm = &(state->strm);
-
-    /* check that can really pass pointer in ints */
-    if (sizeof(int) != sizeof(void *))
-        return Z_STREAM_ERROR;
-
-    /* check that we're writing and that there's no error */
-    if (state->mode != GZ_WRITE || state->err != Z_OK)
-        return Z_STREAM_ERROR;
-
-    /* make sure we have some buffer space */
-    if (state->size == 0 && gz_init(state) == -1)
-        return state->error;
-
-    /* check for seek request */
-    if (state->seek) {
-        state->seek = 0;
-        if (gz_zero(state, state->skip) == -1)
-            return state->error;
-    }
-
-    /* do the printf() into the input buffer, put length in len -- the input
-       buffer is double-sized just for this function, so there is guaranteed to
-       be state->size bytes available after the current contents */
-    if (strm->avail_in == 0)
-        strm->next_in = state->in;
-    next = (char *)(strm->next_in + strm->avail_in);
-    next[state->size - 1] = 0;
-#ifdef NO_snprintf
-#  ifdef HAS_sprintf_void
-    sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,
-            a13, a14, a15, a16, a17, a18, a19, a20);
-    for (len = 0; len < size; len++)
-        if (next[len] == 0)
-            break;
-#  else
-    len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
-                  a12, a13, a14, a15, a16, a17, a18, a19, a20);
-#  endif
-#else
-#  ifdef HAS_snprintf_void
-    snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
-             a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
-    len = strlen(next);
-#  else
-    len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,
-                   a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
-#  endif
-#endif
-
-    /* check that printf() results fit in buffer */
-    if (len == 0 || len >= state->size || next[state->size - 1] != 0)
-        return 0;
-
-    /* update buffer and position, compress first half if past that */
-    strm->avail_in += len;
-    state->x.pos += len;
-    if (strm->avail_in >= state->size) {
-        left = strm->avail_in - state->size;
-        strm->avail_in = state->size;
-        if (gz_comp(state, Z_NO_FLUSH) == -1)
-            return state->err;
-        memcpy(state->in, state->in + state->size, left);
-        strm->next_in = state->in;
-        strm->avail_in = left;
-    }
-    return (int)len;
-}
-
-#endif
-
-/* -- see zlib.h -- */
-int ZEXPORT gzflush(file, flush)
-    gzFile file;
-    int flush;
-{
-    gz_statep state;
-
-    /* get internal structure */
-    if (file == NULL)
-        return Z_STREAM_ERROR;
-    state = (gz_statep)file;
-
-    /* check that we're writing and that there's no error */
-    if (state->mode != GZ_WRITE || state->err != Z_OK)
-        return Z_STREAM_ERROR;
-
-    /* check flush parameter */
-    if (flush < 0 || flush > Z_FINISH)
-        return Z_STREAM_ERROR;
-
-    /* check for seek request */
-    if (state->seek) {
-        state->seek = 0;
-        if (gz_zero(state, state->skip) == -1)
-            return state->err;
-    }
-
-    /* compress remaining data with requested flush */
-    (void)gz_comp(state, flush);
-    return state->err;
-}
-
-/* -- see zlib.h -- */
-int ZEXPORT gzsetparams(file, level, strategy)
-    gzFile file;
-    int level;
-    int strategy;
-{
-    gz_statep state;
-    z_streamp strm;
-
-    /* get internal structure */
-    if (file == NULL)
-        return Z_STREAM_ERROR;
-    state = (gz_statep)file;
-    strm = &(state->strm);
-
-    /* check that we're writing and that there's no error */
-    if (state->mode != GZ_WRITE || state->err != Z_OK)
-        return Z_STREAM_ERROR;
-
-    /* if no change is requested, then do nothing */
-    if (level == state->level && strategy == state->strategy)
-        return Z_OK;
-
-    /* check for seek request */
-    if (state->seek) {
-        state->seek = 0;
-        if (gz_zero(state, state->skip) == -1)
-            return state->err;
-    }
-
-    /* change compression parameters for subsequent input */
-    if (state->size) {
-        /* flush previous input with previous parameters before changing */
-        if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)
-            return state->err;
-        deflateParams(strm, level, strategy);
-    }
-    state->level = level;
-    state->strategy = strategy;
-    return Z_OK;
-}
-
-/* -- see zlib.h -- */
-int ZEXPORT gzclose_w(file)
-    gzFile file;
-{
-    int ret = Z_OK;
-    gz_statep state;
-
-    /* get internal structure */
-    if (file == NULL)
-        return Z_STREAM_ERROR;
-    state = (gz_statep)file;
-
-    /* check that we're writing */
-    if (state->mode != GZ_WRITE)
-        return Z_STREAM_ERROR;
-
-    /* check for seek request */
-    if (state->seek) {
-        state->seek = 0;
-        if (gz_zero(state, state->skip) == -1)
-            ret = state->err;
-    }
-
-    /* flush, free memory, and close file */
-    if (gz_comp(state, Z_FINISH) == -1)
-        ret = state->err;
-    if (state->size) {
-        if (!state->direct) {
-            (void)deflateEnd(&(state->strm));
-            free(state->out);
-        }
-        free(state->in);
-    }
-    gz_error(state, Z_OK, NULL);
-    free(state->path);
-    if (close(state->fd) == -1)
-        ret = Z_ERRNO;
-    free(state);
-    return ret;
-}
diff --git a/src/png/zlib/infback.c b/src/png/zlib/infback.c
deleted file mode 100644
index 59679ecbf..000000000
--- a/src/png/zlib/infback.c
+++ /dev/null
@@ -1,640 +0,0 @@
-/* infback.c -- inflate using a call-back interface
- * Copyright (C) 1995-2016 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/*
-   This code is largely copied from inflate.c.  Normally either infback.o or
-   inflate.o would be linked into an application--not both.  The interface
-   with inffast.c is retained so that optimized assembler-coded versions of
-   inflate_fast() can be used with either inflate.c or infback.c.
- */
-
-#include "zutil.h"
-#include "inftrees.h"
-#include "inflate.h"
-#include "inffast.h"
-
-/* function prototypes */
-local void fixedtables OF((struct inflate_state FAR *state));
-
-/*
-   strm provides memory allocation functions in zalloc and zfree, or
-   Z_NULL to use the library memory allocation functions.
-
-   windowBits is in the range 8..15, and window is a user-supplied
-   window and output buffer that is 2**windowBits bytes.
- */
-int ZEXPORT inflateBackInit_(strm, windowBits, window, version, stream_size)
-z_streamp strm;
-int windowBits;
-unsigned char FAR *window;
-const char *version;
-int stream_size;
-{
-    struct inflate_state FAR *state;
-
-    if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
-        stream_size != (int)(sizeof(z_stream)))
-        return Z_VERSION_ERROR;
-    if (strm == Z_NULL || window == Z_NULL ||
-        windowBits < 8 || windowBits > 15)
-        return Z_STREAM_ERROR;
-    strm->msg = Z_NULL;                 /* in case we return an error */
-    if (strm->zalloc == (alloc_func)0) {
-#ifdef Z_SOLO
-        return Z_STREAM_ERROR;
-#else
-        strm->zalloc = zcalloc;
-        strm->opaque = (voidpf)0;
-#endif
-    }
-    if (strm->zfree == (free_func)0)
-#ifdef Z_SOLO
-        return Z_STREAM_ERROR;
-#else
-    strm->zfree = zcfree;
-#endif
-    state = (struct inflate_state FAR *)ZALLOC(strm, 1,
-                                               sizeof(struct inflate_state));
-    if (state == Z_NULL) return Z_MEM_ERROR;
-    Tracev((stderr, "inflate: allocated\n"));
-    strm->state = (struct internal_state FAR *)state;
-    state->dmax = 32768U;
-    state->wbits = (uInt)windowBits;
-    state->wsize = 1U << windowBits;
-    state->window = window;
-    state->wnext = 0;
-    state->whave = 0;
-    return Z_OK;
-}
-
-/*
-   Return state with length and distance decoding tables and index sizes set to
-   fixed code decoding.  Normally this returns fixed tables from inffixed.h.
-   If BUILDFIXED is defined, then instead this routine builds the tables the
-   first time it's called, and returns those tables the first time and
-   thereafter.  This reduces the size of the code by about 2K bytes, in
-   exchange for a little execution time.  However, BUILDFIXED should not be
-   used for threaded applications, since the rewriting of the tables and virgin
-   may not be thread-safe.
- */
-local void fixedtables(state)
-struct inflate_state FAR *state;
-{
-#ifdef BUILDFIXED
-    static int virgin = 1;
-    static code *lenfix, *distfix;
-    static code fixed[544];
-
-    /* build fixed huffman tables if first call (may not be thread safe) */
-    if (virgin) {
-        unsigned sym, bits;
-        static code *next;
-
-        /* literal/length table */
-        sym = 0;
-        while (sym < 144) state->lens[sym++] = 8;
-        while (sym < 256) state->lens[sym++] = 9;
-        while (sym < 280) state->lens[sym++] = 7;
-        while (sym < 288) state->lens[sym++] = 8;
-        next = fixed;
-        lenfix = next;
-        bits = 9;
-        inflate_table(LENS, state->lens, 288, &(next), &(bits), state->work);
-
-        /* distance table */
-        sym = 0;
-        while (sym < 32) state->lens[sym++] = 5;
-        distfix = next;
-        bits = 5;
-        inflate_table(DISTS, state->lens, 32, &(next), &(bits), state->work);
-
-        /* do this just once */
-        virgin = 0;
-    }
-#else /* !BUILDFIXED */
-#   include "inffixed.h"
-#endif /* BUILDFIXED */
-    state->lencode = lenfix;
-    state->lenbits = 9;
-    state->distcode = distfix;
-    state->distbits = 5;
-}
-
-/* Macros for inflateBack(): */
-
-/* Load returned state from inflate_fast() */
-#define LOAD() \
-    do { \
-        put = strm->next_out; \
-        left = strm->avail_out; \
-        next = strm->next_in; \
-        have = strm->avail_in; \
-        hold = state->hold; \
-        bits = state->bits; \
-    } while (0)
-
-/* Set state from registers for inflate_fast() */
-#define RESTORE() \
-    do { \
-        strm->next_out = put; \
-        strm->avail_out = left; \
-        strm->next_in = next; \
-        strm->avail_in = have; \
-        state->hold = hold; \
-        state->bits = bits; \
-    } while (0)
-
-/* Clear the input bit accumulator */
-#define INITBITS() \
-    do { \
-        hold = 0; \
-        bits = 0; \
-    } while (0)
-
-/* Assure that some input is available.  If input is requested, but denied,
-   then return a Z_BUF_ERROR from inflateBack(). */
-#define PULL() \
-    do { \
-        if (have == 0) { \
-            have = in(in_desc, &next); \
-            if (have == 0) { \
-                next = Z_NULL; \
-                ret = Z_BUF_ERROR; \
-                goto inf_leave; \
-            } \
-        } \
-    } while (0)
-
-/* Get a byte of input into the bit accumulator, or return from inflateBack()
-   with an error if there is no input available. */
-#define PULLBYTE() \
-    do { \
-        PULL(); \
-        have--; \
-        hold += (unsigned long)(*next++) << bits; \
-        bits += 8; \
-    } while (0)
-
-/* Assure that there are at least n bits in the bit accumulator.  If there is
-   not enough available input to do that, then return from inflateBack() with
-   an error. */
-#define NEEDBITS(n) \
-    do { \
-        while (bits < (unsigned)(n)) \
-            PULLBYTE(); \
-    } while (0)
-
-/* Return the low n bits of the bit accumulator (n < 16) */
-#define BITS(n) \
-    ((unsigned)hold & ((1U << (n)) - 1))
-
-/* Remove n bits from the bit accumulator */
-#define DROPBITS(n) \
-    do { \
-        hold >>= (n); \
-        bits -= (unsigned)(n); \
-    } while (0)
-
-/* Remove zero to seven bits as needed to go to a byte boundary */
-#define BYTEBITS() \
-    do { \
-        hold >>= bits & 7; \
-        bits -= bits & 7; \
-    } while (0)
-
-/* Assure that some output space is available, by writing out the window
-   if it's full.  If the write fails, return from inflateBack() with a
-   Z_BUF_ERROR. */
-#define ROOM() \
-    do { \
-        if (left == 0) { \
-            put = state->window; \
-            left = state->wsize; \
-            state->whave = left; \
-            if (out(out_desc, put, left)) { \
-                ret = Z_BUF_ERROR; \
-                goto inf_leave; \
-            } \
-        } \
-    } while (0)
-
-/*
-   strm provides the memory allocation functions and window buffer on input,
-   and provides information on the unused input on return.  For Z_DATA_ERROR
-   returns, strm will also provide an error message.
-
-   in() and out() are the call-back input and output functions.  When
-   inflateBack() needs more input, it calls in().  When inflateBack() has
-   filled the window with output, or when it completes with data in the
-   window, it calls out() to write out the data.  The application must not
-   change the provided input until in() is called again or inflateBack()
-   returns.  The application must not change the window/output buffer until
-   inflateBack() returns.
-
-   in() and out() are called with a descriptor parameter provided in the
-   inflateBack() call.  This parameter can be a structure that provides the
-   information required to do the read or write, as well as accumulated
-   information on the input and output such as totals and check values.
-
-   in() should return zero on failure.  out() should return non-zero on
-   failure.  If either in() or out() fails, than inflateBack() returns a
-   Z_BUF_ERROR.  strm->next_in can be checked for Z_NULL to see whether it
-   was in() or out() that caused in the error.  Otherwise,  inflateBack()
-   returns Z_STREAM_END on success, Z_DATA_ERROR for an deflate format
-   error, or Z_MEM_ERROR if it could not allocate memory for the state.
-   inflateBack() can also return Z_STREAM_ERROR if the input parameters
-   are not correct, i.e. strm is Z_NULL or the state was not initialized.
- */
-int ZEXPORT inflateBack(strm, in, in_desc, out, out_desc)
-z_streamp strm;
-in_func in;
-void FAR *in_desc;
-out_func out;
-void FAR *out_desc;
-{
-    struct inflate_state FAR *state;
-    z_const unsigned char FAR *next;    /* next input */
-    unsigned char FAR *put;     /* next output */
-    unsigned have, left;        /* available input and output */
-    unsigned long hold;         /* bit buffer */
-    unsigned bits;              /* bits in bit buffer */
-    unsigned copy;              /* number of stored or match bytes to copy */
-    unsigned char FAR *from;    /* where to copy match bytes from */
-    code here;                  /* current decoding table entry */
-    code last;                  /* parent table entry */
-    unsigned len;               /* length to copy for repeats, bits to drop */
-    int ret;                    /* return code */
-    static const unsigned short order[19] = /* permutation of code lengths */
-        {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
-
-    /* Check that the strm exists and that the state was initialized */
-    if (strm == Z_NULL || strm->state == Z_NULL)
-        return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-
-    /* Reset the state */
-    strm->msg = Z_NULL;
-    state->mode = TYPE;
-    state->last = 0;
-    state->whave = 0;
-    next = strm->next_in;
-    have = next != Z_NULL ? strm->avail_in : 0;
-    hold = 0;
-    bits = 0;
-    put = state->window;
-    left = state->wsize;
-
-    /* Inflate until end of block marked as last */
-    for (;;)
-        switch (state->mode) {
-        case TYPE:
-            /* determine and dispatch block type */
-            if (state->last) {
-                BYTEBITS();
-                state->mode = DONE;
-                break;
-            }
-            NEEDBITS(3);
-            state->last = BITS(1);
-            DROPBITS(1);
-            switch (BITS(2)) {
-            case 0:                             /* stored block */
-                Tracev((stderr, "inflate:     stored block%s\n",
-                        state->last ? " (last)" : ""));
-                state->mode = STORED;
-                break;
-            case 1:                             /* fixed block */
-                fixedtables(state);
-                Tracev((stderr, "inflate:     fixed codes block%s\n",
-                        state->last ? " (last)" : ""));
-                state->mode = LEN;              /* decode codes */
-                break;
-            case 2:                             /* dynamic block */
-                Tracev((stderr, "inflate:     dynamic codes block%s\n",
-                        state->last ? " (last)" : ""));
-                state->mode = TABLE;
-                break;
-            case 3:
-                strm->msg = (char *)"invalid block type";
-                state->mode = BAD;
-            }
-            DROPBITS(2);
-            break;
-
-        case STORED:
-            /* get and verify stored block length */
-            BYTEBITS();                         /* go to byte boundary */
-            NEEDBITS(32);
-            if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) {
-                strm->msg = (char *)"invalid stored block lengths";
-                state->mode = BAD;
-                break;
-            }
-            state->length = (unsigned)hold & 0xffff;
-            Tracev((stderr, "inflate:       stored length %u\n",
-                    state->length));
-            INITBITS();
-
-            /* copy stored block from input to output */
-            while (state->length != 0) {
-                copy = state->length;
-                PULL();
-                ROOM();
-                if (copy > have) copy = have;
-                if (copy > left) copy = left;
-                zmemcpy(put, next, copy);
-                have -= copy;
-                next += copy;
-                left -= copy;
-                put += copy;
-                state->length -= copy;
-            }
-            Tracev((stderr, "inflate:       stored end\n"));
-            state->mode = TYPE;
-            break;
-
-        case TABLE:
-            /* get dynamic table entries descriptor */
-            NEEDBITS(14);
-            state->nlen = BITS(5) + 257;
-            DROPBITS(5);
-            state->ndist = BITS(5) + 1;
-            DROPBITS(5);
-            state->ncode = BITS(4) + 4;
-            DROPBITS(4);
-#ifndef PKZIP_BUG_WORKAROUND
-            if (state->nlen > 286 || state->ndist > 30) {
-                strm->msg = (char *)"too many length or distance symbols";
-                state->mode = BAD;
-                break;
-            }
-#endif
-            Tracev((stderr, "inflate:       table sizes ok\n"));
-
-            /* get code length code lengths (not a typo) */
-            state->have = 0;
-            while (state->have < state->ncode) {
-                NEEDBITS(3);
-                state->lens[order[state->have++]] = (unsigned short)BITS(3);
-                DROPBITS(3);
-            }
-            while (state->have < 19)
-                state->lens[order[state->have++]] = 0;
-            state->next = state->codes;
-            state->lencode = (code const FAR *)(state->next);
-            state->lenbits = 7;
-            ret = inflate_table(CODES, state->lens, 19, &(state->next),
-                                &(state->lenbits), state->work);
-            if (ret) {
-                strm->msg = (char *)"invalid code lengths set";
-                state->mode = BAD;
-                break;
-            }
-            Tracev((stderr, "inflate:       code lengths ok\n"));
-
-            /* get length and distance code code lengths */
-            state->have = 0;
-            while (state->have < state->nlen + state->ndist) {
-                for (;;) {
-                    here = state->lencode[BITS(state->lenbits)];
-                    if ((unsigned)(here.bits) <= bits) break;
-                    PULLBYTE();
-                }
-                if (here.val < 16) {
-                    DROPBITS(here.bits);
-                    state->lens[state->have++] = here.val;
-                }
-                else {
-                    if (here.val == 16) {
-                        NEEDBITS(here.bits + 2);
-                        DROPBITS(here.bits);
-                        if (state->have == 0) {
-                            strm->msg = (char *)"invalid bit length repeat";
-                            state->mode = BAD;
-                            break;
-                        }
-                        len = (unsigned)(state->lens[state->have - 1]);
-                        copy = 3 + BITS(2);
-                        DROPBITS(2);
-                    }
-                    else if (here.val == 17) {
-                        NEEDBITS(here.bits + 3);
-                        DROPBITS(here.bits);
-                        len = 0;
-                        copy = 3 + BITS(3);
-                        DROPBITS(3);
-                    }
-                    else {
-                        NEEDBITS(here.bits + 7);
-                        DROPBITS(here.bits);
-                        len = 0;
-                        copy = 11 + BITS(7);
-                        DROPBITS(7);
-                    }
-                    if (state->have + copy > state->nlen + state->ndist) {
-                        strm->msg = (char *)"invalid bit length repeat";
-                        state->mode = BAD;
-                        break;
-                    }
-                    while (copy--)
-                        state->lens[state->have++] = (unsigned short)len;
-                }
-            }
-
-            /* handle error breaks in while */
-            if (state->mode == BAD) break;
-
-            /* check for end-of-block code (better have one) */
-            if (state->lens[256] == 0) {
-                strm->msg = (char *)"invalid code -- missing end-of-block";
-                state->mode = BAD;
-                break;
-            }
-
-            /* build code tables -- note: do not change the lenbits or distbits
-               values here (9 and 6) without reading the comments in inftrees.h
-               concerning the ENOUGH constants, which depend on those values */
-            state->next = state->codes;
-            state->lencode = (code const FAR *)(state->next);
-            state->lenbits = 9;
-            ret = inflate_table(LENS, state->lens, state->nlen, &(state->next),
-                                &(state->lenbits), state->work);
-            if (ret) {
-                strm->msg = (char *)"invalid literal/lengths set";
-                state->mode = BAD;
-                break;
-            }
-            state->distcode = (code const FAR *)(state->next);
-            state->distbits = 6;
-            ret = inflate_table(DISTS, state->lens + state->nlen, state->ndist,
-                            &(state->next), &(state->distbits), state->work);
-            if (ret) {
-                strm->msg = (char *)"invalid distances set";
-                state->mode = BAD;
-                break;
-            }
-            Tracev((stderr, "inflate:       codes ok\n"));
-            state->mode = LEN;
-
-        case LEN:
-            /* use inflate_fast() if we have enough input and output */
-            if (have >= 6 && left >= 258) {
-                RESTORE();
-                if (state->whave < state->wsize)
-                    state->whave = state->wsize - left;
-                inflate_fast(strm, state->wsize);
-                LOAD();
-                break;
-            }
-
-            /* get a literal, length, or end-of-block code */
-            for (;;) {
-                here = state->lencode[BITS(state->lenbits)];
-                if ((unsigned)(here.bits) <= bits) break;
-                PULLBYTE();
-            }
-            if (here.op && (here.op & 0xf0) == 0) {
-                last = here;
-                for (;;) {
-                    here = state->lencode[last.val +
-                            (BITS(last.bits + last.op) >> last.bits)];
-                    if ((unsigned)(last.bits + here.bits) <= bits) break;
-                    PULLBYTE();
-                }
-                DROPBITS(last.bits);
-            }
-            DROPBITS(here.bits);
-            state->length = (unsigned)here.val;
-
-            /* process literal */
-            if (here.op == 0) {
-                Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
-                        "inflate:         literal '%c'\n" :
-                        "inflate:         literal 0x%02x\n", here.val));
-                ROOM();
-                *put++ = (unsigned char)(state->length);
-                left--;
-                state->mode = LEN;
-                break;
-            }
-
-            /* process end of block */
-            if (here.op & 32) {
-                Tracevv((stderr, "inflate:         end of block\n"));
-                state->mode = TYPE;
-                break;
-            }
-
-            /* invalid code */
-            if (here.op & 64) {
-                strm->msg = (char *)"invalid literal/length code";
-                state->mode = BAD;
-                break;
-            }
-
-            /* length code -- get extra bits, if any */
-            state->extra = (unsigned)(here.op) & 15;
-            if (state->extra != 0) {
-                NEEDBITS(state->extra);
-                state->length += BITS(state->extra);
-                DROPBITS(state->extra);
-            }
-            Tracevv((stderr, "inflate:         length %u\n", state->length));
-
-            /* get distance code */
-            for (;;) {
-                here = state->distcode[BITS(state->distbits)];
-                if ((unsigned)(here.bits) <= bits) break;
-                PULLBYTE();
-            }
-            if ((here.op & 0xf0) == 0) {
-                last = here;
-                for (;;) {
-                    here = state->distcode[last.val +
-                            (BITS(last.bits + last.op) >> last.bits)];
-                    if ((unsigned)(last.bits + here.bits) <= bits) break;
-                    PULLBYTE();
-                }
-                DROPBITS(last.bits);
-            }
-            DROPBITS(here.bits);
-            if (here.op & 64) {
-                strm->msg = (char *)"invalid distance code";
-                state->mode = BAD;
-                break;
-            }
-            state->offset = (unsigned)here.val;
-
-            /* get distance extra bits, if any */
-            state->extra = (unsigned)(here.op) & 15;
-            if (state->extra != 0) {
-                NEEDBITS(state->extra);
-                state->offset += BITS(state->extra);
-                DROPBITS(state->extra);
-            }
-            if (state->offset > state->wsize - (state->whave < state->wsize ?
-                                                left : 0)) {
-                strm->msg = (char *)"invalid distance too far back";
-                state->mode = BAD;
-                break;
-            }
-            Tracevv((stderr, "inflate:         distance %u\n", state->offset));
-
-            /* copy match from window to output */
-            do {
-                ROOM();
-                copy = state->wsize - state->offset;
-                if (copy < left) {
-                    from = put + copy;
-                    copy = left - copy;
-                }
-                else {
-                    from = put - state->offset;
-                    copy = left;
-                }
-                if (copy > state->length) copy = state->length;
-                state->length -= copy;
-                left -= copy;
-                do {
-                    *put++ = *from++;
-                } while (--copy);
-            } while (state->length != 0);
-            break;
-
-        case DONE:
-            /* inflate stream terminated properly -- write leftover output */
-            ret = Z_STREAM_END;
-            if (left < state->wsize) {
-                if (out(out_desc, state->window, state->wsize - left))
-                    ret = Z_BUF_ERROR;
-            }
-            goto inf_leave;
-
-        case BAD:
-            ret = Z_DATA_ERROR;
-            goto inf_leave;
-
-        default:                /* can't happen, but makes compilers happy */
-            ret = Z_STREAM_ERROR;
-            goto inf_leave;
-        }
-
-    /* Return unused input */
-  inf_leave:
-    strm->next_in = next;
-    strm->avail_in = have;
-    return ret;
-}
-
-int ZEXPORT inflateBackEnd(strm)
-z_streamp strm;
-{
-    if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0)
-        return Z_STREAM_ERROR;
-    ZFREE(strm, strm->state);
-    strm->state = Z_NULL;
-    Tracev((stderr, "inflate: end\n"));
-    return Z_OK;
-}
diff --git a/src/png/zlib/inffast.c b/src/png/zlib/inffast.c
deleted file mode 100644
index 0dbd1dbc0..000000000
--- a/src/png/zlib/inffast.c
+++ /dev/null
@@ -1,323 +0,0 @@
-/* inffast.c -- fast decoding
- * Copyright (C) 1995-2017 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-#include "zutil.h"
-#include "inftrees.h"
-#include "inflate.h"
-#include "inffast.h"
-
-#ifdef ASMINF
-#  pragma message("Assembler code may have bugs -- use at your own risk")
-#else
-
-/*
-   Decode literal, length, and distance codes and write out the resulting
-   literal and match bytes until either not enough input or output is
-   available, an end-of-block is encountered, or a data error is encountered.
-   When large enough input and output buffers are supplied to inflate(), for
-   example, a 16K input buffer and a 64K output buffer, more than 95% of the
-   inflate execution time is spent in this routine.
-
-   Entry assumptions:
-
-        state->mode == LEN
-        strm->avail_in >= 6
-        strm->avail_out >= 258
-        start >= strm->avail_out
-        state->bits < 8
-
-   On return, state->mode is one of:
-
-        LEN -- ran out of enough output space or enough available input
-        TYPE -- reached end of block code, inflate() to interpret next block
-        BAD -- error in block data
-
-   Notes:
-
-    - The maximum input bits used by a length/distance pair is 15 bits for the
-      length code, 5 bits for the length extra, 15 bits for the distance code,
-      and 13 bits for the distance extra.  This totals 48 bits, or six bytes.
-      Therefore if strm->avail_in >= 6, then there is enough input to avoid
-      checking for available input while decoding.
-
-    - The maximum bytes that a single length/distance pair can output is 258
-      bytes, which is the maximum length that can be coded.  inflate_fast()
-      requires strm->avail_out >= 258 for each loop to avoid checking for
-      output space.
- */
-void ZLIB_INTERNAL inflate_fast(strm, start)
-z_streamp strm;
-unsigned start;         /* inflate()'s starting value for strm->avail_out */
-{
-    struct inflate_state FAR *state;
-    z_const unsigned char FAR *in;      /* local strm->next_in */
-    z_const unsigned char FAR *last;    /* have enough input while in < last */
-    unsigned char FAR *out;     /* local strm->next_out */
-    unsigned char FAR *beg;     /* inflate()'s initial strm->next_out */
-    unsigned char FAR *end;     /* while out < end, enough space available */
-#ifdef INFLATE_STRICT
-    unsigned dmax;              /* maximum distance from zlib header */
-#endif
-    unsigned wsize;             /* window size or zero if not using window */
-    unsigned whave;             /* valid bytes in the window */
-    unsigned wnext;             /* window write index */
-    unsigned char FAR *window;  /* allocated sliding window, if wsize != 0 */
-    unsigned long hold;         /* local strm->hold */
-    unsigned bits;              /* local strm->bits */
-    code const FAR *lcode;      /* local strm->lencode */
-    code const FAR *dcode;      /* local strm->distcode */
-    unsigned lmask;             /* mask for first level of length codes */
-    unsigned dmask;             /* mask for first level of distance codes */
-    code here;                  /* retrieved table entry */
-    unsigned op;                /* code bits, operation, extra bits, or */
-                                /*  window position, window bytes to copy */
-    unsigned len;               /* match length, unused bytes */
-    unsigned dist;              /* match distance */
-    unsigned char FAR *from;    /* where to copy match from */
-
-    /* copy state to local variables */
-    state = (struct inflate_state FAR *)strm->state;
-    in = strm->next_in;
-    last = in + (strm->avail_in - 5);
-    out = strm->next_out;
-    beg = out - (start - strm->avail_out);
-    end = out + (strm->avail_out - 257);
-#ifdef INFLATE_STRICT
-    dmax = state->dmax;
-#endif
-    wsize = state->wsize;
-    whave = state->whave;
-    wnext = state->wnext;
-    window = state->window;
-    hold = state->hold;
-    bits = state->bits;
-    lcode = state->lencode;
-    dcode = state->distcode;
-    lmask = (1U << state->lenbits) - 1;
-    dmask = (1U << state->distbits) - 1;
-
-    /* decode literals and length/distances until end-of-block or not enough
-       input data or output space */
-    do {
-        if (bits < 15) {
-            hold += (unsigned long)(*in++) << bits;
-            bits += 8;
-            hold += (unsigned long)(*in++) << bits;
-            bits += 8;
-        }
-        here = lcode[hold & lmask];
-      dolen:
-        op = (unsigned)(here.bits);
-        hold >>= op;
-        bits -= op;
-        op = (unsigned)(here.op);
-        if (op == 0) {                          /* literal */
-            Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
-                    "inflate:         literal '%c'\n" :
-                    "inflate:         literal 0x%02x\n", here.val));
-            *out++ = (unsigned char)(here.val);
-        }
-        else if (op & 16) {                     /* length base */
-            len = (unsigned)(here.val);
-            op &= 15;                           /* number of extra bits */
-            if (op) {
-                if (bits < op) {
-                    hold += (unsigned long)(*in++) << bits;
-                    bits += 8;
-                }
-                len += (unsigned)hold & ((1U << op) - 1);
-                hold >>= op;
-                bits -= op;
-            }
-            Tracevv((stderr, "inflate:         length %u\n", len));
-            if (bits < 15) {
-                hold += (unsigned long)(*in++) << bits;
-                bits += 8;
-                hold += (unsigned long)(*in++) << bits;
-                bits += 8;
-            }
-            here = dcode[hold & dmask];
-          dodist:
-            op = (unsigned)(here.bits);
-            hold >>= op;
-            bits -= op;
-            op = (unsigned)(here.op);
-            if (op & 16) {                      /* distance base */
-                dist = (unsigned)(here.val);
-                op &= 15;                       /* number of extra bits */
-                if (bits < op) {
-                    hold += (unsigned long)(*in++) << bits;
-                    bits += 8;
-                    if (bits < op) {
-                        hold += (unsigned long)(*in++) << bits;
-                        bits += 8;
-                    }
-                }
-                dist += (unsigned)hold & ((1U << op) - 1);
-#ifdef INFLATE_STRICT
-                if (dist > dmax) {
-                    strm->msg = (char *)"invalid distance too far back";
-                    state->mode = BAD;
-                    break;
-                }
-#endif
-                hold >>= op;
-                bits -= op;
-                Tracevv((stderr, "inflate:         distance %u\n", dist));
-                op = (unsigned)(out - beg);     /* max distance in output */
-                if (dist > op) {                /* see if copy from window */
-                    op = dist - op;             /* distance back in window */
-                    if (op > whave) {
-                        if (state->sane) {
-                            strm->msg =
-                                (char *)"invalid distance too far back";
-                            state->mode = BAD;
-                            break;
-                        }
-#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
-                        if (len <= op - whave) {
-                            do {
-                                *out++ = 0;
-                            } while (--len);
-                            continue;
-                        }
-                        len -= op - whave;
-                        do {
-                            *out++ = 0;
-                        } while (--op > whave);
-                        if (op == 0) {
-                            from = out - dist;
-                            do {
-                                *out++ = *from++;
-                            } while (--len);
-                            continue;
-                        }
-#endif
-                    }
-                    from = window;
-                    if (wnext == 0) {           /* very common case */
-                        from += wsize - op;
-                        if (op < len) {         /* some from window */
-                            len -= op;
-                            do {
-                                *out++ = *from++;
-                            } while (--op);
-                            from = out - dist;  /* rest from output */
-                        }
-                    }
-                    else if (wnext < op) {      /* wrap around window */
-                        from += wsize + wnext - op;
-                        op -= wnext;
-                        if (op < len) {         /* some from end of window */
-                            len -= op;
-                            do {
-                                *out++ = *from++;
-                            } while (--op);
-                            from = window;
-                            if (wnext < len) {  /* some from start of window */
-                                op = wnext;
-                                len -= op;
-                                do {
-                                    *out++ = *from++;
-                                } while (--op);
-                                from = out - dist;      /* rest from output */
-                            }
-                        }
-                    }
-                    else {                      /* contiguous in window */
-                        from += wnext - op;
-                        if (op < len) {         /* some from window */
-                            len -= op;
-                            do {
-                                *out++ = *from++;
-                            } while (--op);
-                            from = out - dist;  /* rest from output */
-                        }
-                    }
-                    while (len > 2) {
-                        *out++ = *from++;
-                        *out++ = *from++;
-                        *out++ = *from++;
-                        len -= 3;
-                    }
-                    if (len) {
-                        *out++ = *from++;
-                        if (len > 1)
-                            *out++ = *from++;
-                    }
-                }
-                else {
-                    from = out - dist;          /* copy direct from output */
-                    do {                        /* minimum length is three */
-                        *out++ = *from++;
-                        *out++ = *from++;
-                        *out++ = *from++;
-                        len -= 3;
-                    } while (len > 2);
-                    if (len) {
-                        *out++ = *from++;
-                        if (len > 1)
-                            *out++ = *from++;
-                    }
-                }
-            }
-            else if ((op & 64) == 0) {          /* 2nd level distance code */
-                here = dcode[here.val + (hold & ((1U << op) - 1))];
-                goto dodist;
-            }
-            else {
-                strm->msg = (char *)"invalid distance code";
-                state->mode = BAD;
-                break;
-            }
-        }
-        else if ((op & 64) == 0) {              /* 2nd level length code */
-            here = lcode[here.val + (hold & ((1U << op) - 1))];
-            goto dolen;
-        }
-        else if (op & 32) {                     /* end-of-block */
-            Tracevv((stderr, "inflate:         end of block\n"));
-            state->mode = TYPE;
-            break;
-        }
-        else {
-            strm->msg = (char *)"invalid literal/length code";
-            state->mode = BAD;
-            break;
-        }
-    } while (in < last && out < end);
-
-    /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
-    len = bits >> 3;
-    in -= len;
-    bits -= len << 3;
-    hold &= (1U << bits) - 1;
-
-    /* update state and return */
-    strm->next_in = in;
-    strm->next_out = out;
-    strm->avail_in = (unsigned)(in < last ? 5 + (last - in) : 5 - (in - last));
-    strm->avail_out = (unsigned)(out < end ?
-                                 257 + (end - out) : 257 - (out - end));
-    state->hold = hold;
-    state->bits = bits;
-    return;
-}
-
-/*
-   inflate_fast() speedups that turned out slower (on a PowerPC G3 750CXe):
-   - Using bit fields for code structure
-   - Different op definition to avoid & for extra bits (do & for table bits)
-   - Three separate decoding do-loops for direct, window, and wnext == 0
-   - Special case for distance > 1 copies to do overlapped load and store copy
-   - Explicit branch predictions (based on measured branch probabilities)
-   - Deferring match copy and interspersed it with decoding subsequent codes
-   - Swapping literal/length else
-   - Swapping window/direct else
-   - Larger unrolled copy loops (three is about right)
-   - Moving len -= 3 statement into middle of loop
- */
-
-#endif /* !ASMINF */
diff --git a/src/png/zlib/inffast.h b/src/png/zlib/inffast.h
deleted file mode 100644
index e5c1aa4ca..000000000
--- a/src/png/zlib/inffast.h
+++ /dev/null
@@ -1,11 +0,0 @@
-/* inffast.h -- header to use inffast.c
- * Copyright (C) 1995-2003, 2010 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* WARNING: this file should *not* be used by applications. It is
-   part of the implementation of the compression library and is
-   subject to change. Applications should only use zlib.h.
- */
-
-void ZLIB_INTERNAL inflate_fast OF((z_streamp strm, unsigned start));
diff --git a/src/png/zlib/inffixed.h b/src/png/zlib/inffixed.h
deleted file mode 100644
index d62832776..000000000
--- a/src/png/zlib/inffixed.h
+++ /dev/null
@@ -1,94 +0,0 @@
-    /* inffixed.h -- table for decoding fixed codes
-     * Generated automatically by makefixed().
-     */
-
-    /* WARNING: this file should *not* be used by applications.
-       It is part of the implementation of this library and is
-       subject to change. Applications should only use zlib.h.
-     */
-
-    static const code lenfix[512] = {
-        {96,7,0},{0,8,80},{0,8,16},{20,8,115},{18,7,31},{0,8,112},{0,8,48},
-        {0,9,192},{16,7,10},{0,8,96},{0,8,32},{0,9,160},{0,8,0},{0,8,128},
-        {0,8,64},{0,9,224},{16,7,6},{0,8,88},{0,8,24},{0,9,144},{19,7,59},
-        {0,8,120},{0,8,56},{0,9,208},{17,7,17},{0,8,104},{0,8,40},{0,9,176},
-        {0,8,8},{0,8,136},{0,8,72},{0,9,240},{16,7,4},{0,8,84},{0,8,20},
-        {21,8,227},{19,7,43},{0,8,116},{0,8,52},{0,9,200},{17,7,13},{0,8,100},
-        {0,8,36},{0,9,168},{0,8,4},{0,8,132},{0,8,68},{0,9,232},{16,7,8},
-        {0,8,92},{0,8,28},{0,9,152},{20,7,83},{0,8,124},{0,8,60},{0,9,216},
-        {18,7,23},{0,8,108},{0,8,44},{0,9,184},{0,8,12},{0,8,140},{0,8,76},
-        {0,9,248},{16,7,3},{0,8,82},{0,8,18},{21,8,163},{19,7,35},{0,8,114},
-        {0,8,50},{0,9,196},{17,7,11},{0,8,98},{0,8,34},{0,9,164},{0,8,2},
-        {0,8,130},{0,8,66},{0,9,228},{16,7,7},{0,8,90},{0,8,26},{0,9,148},
-        {20,7,67},{0,8,122},{0,8,58},{0,9,212},{18,7,19},{0,8,106},{0,8,42},
-        {0,9,180},{0,8,10},{0,8,138},{0,8,74},{0,9,244},{16,7,5},{0,8,86},
-        {0,8,22},{64,8,0},{19,7,51},{0,8,118},{0,8,54},{0,9,204},{17,7,15},
-        {0,8,102},{0,8,38},{0,9,172},{0,8,6},{0,8,134},{0,8,70},{0,9,236},
-        {16,7,9},{0,8,94},{0,8,30},{0,9,156},{20,7,99},{0,8,126},{0,8,62},
-        {0,9,220},{18,7,27},{0,8,110},{0,8,46},{0,9,188},{0,8,14},{0,8,142},
-        {0,8,78},{0,9,252},{96,7,0},{0,8,81},{0,8,17},{21,8,131},{18,7,31},
-        {0,8,113},{0,8,49},{0,9,194},{16,7,10},{0,8,97},{0,8,33},{0,9,162},
-        {0,8,1},{0,8,129},{0,8,65},{0,9,226},{16,7,6},{0,8,89},{0,8,25},
-        {0,9,146},{19,7,59},{0,8,121},{0,8,57},{0,9,210},{17,7,17},{0,8,105},
-        {0,8,41},{0,9,178},{0,8,9},{0,8,137},{0,8,73},{0,9,242},{16,7,4},
-        {0,8,85},{0,8,21},{16,8,258},{19,7,43},{0,8,117},{0,8,53},{0,9,202},
-        {17,7,13},{0,8,101},{0,8,37},{0,9,170},{0,8,5},{0,8,133},{0,8,69},
-        {0,9,234},{16,7,8},{0,8,93},{0,8,29},{0,9,154},{20,7,83},{0,8,125},
-        {0,8,61},{0,9,218},{18,7,23},{0,8,109},{0,8,45},{0,9,186},{0,8,13},
-        {0,8,141},{0,8,77},{0,9,250},{16,7,3},{0,8,83},{0,8,19},{21,8,195},
-        {19,7,35},{0,8,115},{0,8,51},{0,9,198},{17,7,11},{0,8,99},{0,8,35},
-        {0,9,166},{0,8,3},{0,8,131},{0,8,67},{0,9,230},{16,7,7},{0,8,91},
-        {0,8,27},{0,9,150},{20,7,67},{0,8,123},{0,8,59},{0,9,214},{18,7,19},
-        {0,8,107},{0,8,43},{0,9,182},{0,8,11},{0,8,139},{0,8,75},{0,9,246},
-        {16,7,5},{0,8,87},{0,8,23},{64,8,0},{19,7,51},{0,8,119},{0,8,55},
-        {0,9,206},{17,7,15},{0,8,103},{0,8,39},{0,9,174},{0,8,7},{0,8,135},
-        {0,8,71},{0,9,238},{16,7,9},{0,8,95},{0,8,31},{0,9,158},{20,7,99},
-        {0,8,127},{0,8,63},{0,9,222},{18,7,27},{0,8,111},{0,8,47},{0,9,190},
-        {0,8,15},{0,8,143},{0,8,79},{0,9,254},{96,7,0},{0,8,80},{0,8,16},
-        {20,8,115},{18,7,31},{0,8,112},{0,8,48},{0,9,193},{16,7,10},{0,8,96},
-        {0,8,32},{0,9,161},{0,8,0},{0,8,128},{0,8,64},{0,9,225},{16,7,6},
-        {0,8,88},{0,8,24},{0,9,145},{19,7,59},{0,8,120},{0,8,56},{0,9,209},
-        {17,7,17},{0,8,104},{0,8,40},{0,9,177},{0,8,8},{0,8,136},{0,8,72},
-        {0,9,241},{16,7,4},{0,8,84},{0,8,20},{21,8,227},{19,7,43},{0,8,116},
-        {0,8,52},{0,9,201},{17,7,13},{0,8,100},{0,8,36},{0,9,169},{0,8,4},
-        {0,8,132},{0,8,68},{0,9,233},{16,7,8},{0,8,92},{0,8,28},{0,9,153},
-        {20,7,83},{0,8,124},{0,8,60},{0,9,217},{18,7,23},{0,8,108},{0,8,44},
-        {0,9,185},{0,8,12},{0,8,140},{0,8,76},{0,9,249},{16,7,3},{0,8,82},
-        {0,8,18},{21,8,163},{19,7,35},{0,8,114},{0,8,50},{0,9,197},{17,7,11},
-        {0,8,98},{0,8,34},{0,9,165},{0,8,2},{0,8,130},{0,8,66},{0,9,229},
-        {16,7,7},{0,8,90},{0,8,26},{0,9,149},{20,7,67},{0,8,122},{0,8,58},
-        {0,9,213},{18,7,19},{0,8,106},{0,8,42},{0,9,181},{0,8,10},{0,8,138},
-        {0,8,74},{0,9,245},{16,7,5},{0,8,86},{0,8,22},{64,8,0},{19,7,51},
-        {0,8,118},{0,8,54},{0,9,205},{17,7,15},{0,8,102},{0,8,38},{0,9,173},
-        {0,8,6},{0,8,134},{0,8,70},{0,9,237},{16,7,9},{0,8,94},{0,8,30},
-        {0,9,157},{20,7,99},{0,8,126},{0,8,62},{0,9,221},{18,7,27},{0,8,110},
-        {0,8,46},{0,9,189},{0,8,14},{0,8,142},{0,8,78},{0,9,253},{96,7,0},
-        {0,8,81},{0,8,17},{21,8,131},{18,7,31},{0,8,113},{0,8,49},{0,9,195},
-        {16,7,10},{0,8,97},{0,8,33},{0,9,163},{0,8,1},{0,8,129},{0,8,65},
-        {0,9,227},{16,7,6},{0,8,89},{0,8,25},{0,9,147},{19,7,59},{0,8,121},
-        {0,8,57},{0,9,211},{17,7,17},{0,8,105},{0,8,41},{0,9,179},{0,8,9},
-        {0,8,137},{0,8,73},{0,9,243},{16,7,4},{0,8,85},{0,8,21},{16,8,258},
-        {19,7,43},{0,8,117},{0,8,53},{0,9,203},{17,7,13},{0,8,101},{0,8,37},
-        {0,9,171},{0,8,5},{0,8,133},{0,8,69},{0,9,235},{16,7,8},{0,8,93},
-        {0,8,29},{0,9,155},{20,7,83},{0,8,125},{0,8,61},{0,9,219},{18,7,23},
-        {0,8,109},{0,8,45},{0,9,187},{0,8,13},{0,8,141},{0,8,77},{0,9,251},
-        {16,7,3},{0,8,83},{0,8,19},{21,8,195},{19,7,35},{0,8,115},{0,8,51},
-        {0,9,199},{17,7,11},{0,8,99},{0,8,35},{0,9,167},{0,8,3},{0,8,131},
-        {0,8,67},{0,9,231},{16,7,7},{0,8,91},{0,8,27},{0,9,151},{20,7,67},
-        {0,8,123},{0,8,59},{0,9,215},{18,7,19},{0,8,107},{0,8,43},{0,9,183},
-        {0,8,11},{0,8,139},{0,8,75},{0,9,247},{16,7,5},{0,8,87},{0,8,23},
-        {64,8,0},{19,7,51},{0,8,119},{0,8,55},{0,9,207},{17,7,15},{0,8,103},
-        {0,8,39},{0,9,175},{0,8,7},{0,8,135},{0,8,71},{0,9,239},{16,7,9},
-        {0,8,95},{0,8,31},{0,9,159},{20,7,99},{0,8,127},{0,8,63},{0,9,223},
-        {18,7,27},{0,8,111},{0,8,47},{0,9,191},{0,8,15},{0,8,143},{0,8,79},
-        {0,9,255}
-    };
-
-    static const code distfix[32] = {
-        {16,5,1},{23,5,257},{19,5,17},{27,5,4097},{17,5,5},{25,5,1025},
-        {21,5,65},{29,5,16385},{16,5,3},{24,5,513},{20,5,33},{28,5,8193},
-        {18,5,9},{26,5,2049},{22,5,129},{64,5,0},{16,5,2},{23,5,385},
-        {19,5,25},{27,5,6145},{17,5,7},{25,5,1537},{21,5,97},{29,5,24577},
-        {16,5,4},{24,5,769},{20,5,49},{28,5,12289},{18,5,13},{26,5,3073},
-        {22,5,193},{64,5,0}
-    };
diff --git a/src/png/zlib/inflate.c b/src/png/zlib/inflate.c
deleted file mode 100644
index ac333e8c2..000000000
--- a/src/png/zlib/inflate.c
+++ /dev/null
@@ -1,1561 +0,0 @@
-/* inflate.c -- zlib decompression
- * Copyright (C) 1995-2016 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/*
- * Change history:
- *
- * 1.2.beta0    24 Nov 2002
- * - First version -- complete rewrite of inflate to simplify code, avoid
- *   creation of window when not needed, minimize use of window when it is
- *   needed, make inffast.c even faster, implement gzip decoding, and to
- *   improve code readability and style over the previous zlib inflate code
- *
- * 1.2.beta1    25 Nov 2002
- * - Use pointers for available input and output checking in inffast.c
- * - Remove input and output counters in inffast.c
- * - Change inffast.c entry and loop from avail_in >= 7 to >= 6
- * - Remove unnecessary second byte pull from length extra in inffast.c
- * - Unroll direct copy to three copies per loop in inffast.c
- *
- * 1.2.beta2    4 Dec 2002
- * - Change external routine names to reduce potential conflicts
- * - Correct filename to inffixed.h for fixed tables in inflate.c
- * - Make hbuf[] unsigned char to match parameter type in inflate.c
- * - Change strm->next_out[-state->offset] to *(strm->next_out - state->offset)
- *   to avoid negation problem on Alphas (64 bit) in inflate.c
- *
- * 1.2.beta3    22 Dec 2002
- * - Add comments on state->bits assertion in inffast.c
- * - Add comments on op field in inftrees.h
- * - Fix bug in reuse of allocated window after inflateReset()
- * - Remove bit fields--back to byte structure for speed
- * - Remove distance extra == 0 check in inflate_fast()--only helps for lengths
- * - Change post-increments to pre-increments in inflate_fast(), PPC biased?
- * - Add compile time option, POSTINC, to use post-increments instead (Intel?)
- * - Make MATCH copy in inflate() much faster for when inflate_fast() not used
- * - Use local copies of stream next and avail values, as well as local bit
- *   buffer and bit count in inflate()--for speed when inflate_fast() not used
- *
- * 1.2.beta4    1 Jan 2003
- * - Split ptr - 257 statements in inflate_table() to avoid compiler warnings
- * - Move a comment on output buffer sizes from inffast.c to inflate.c
- * - Add comments in inffast.c to introduce the inflate_fast() routine
- * - Rearrange window copies in inflate_fast() for speed and simplification
- * - Unroll last copy for window match in inflate_fast()
- * - Use local copies of window variables in inflate_fast() for speed
- * - Pull out common wnext == 0 case for speed in inflate_fast()
- * - Make op and len in inflate_fast() unsigned for consistency
- * - Add FAR to lcode and dcode declarations in inflate_fast()
- * - Simplified bad distance check in inflate_fast()
- * - Added inflateBackInit(), inflateBack(), and inflateBackEnd() in new
- *   source file infback.c to provide a call-back interface to inflate for
- *   programs like gzip and unzip -- uses window as output buffer to avoid
- *   window copying
- *
- * 1.2.beta5    1 Jan 2003
- * - Improved inflateBack() interface to allow the caller to provide initial
- *   input in strm.
- * - Fixed stored blocks bug in inflateBack()
- *
- * 1.2.beta6    4 Jan 2003
- * - Added comments in inffast.c on effectiveness of POSTINC
- * - Typecasting all around to reduce compiler warnings
- * - Changed loops from while (1) or do {} while (1) to for (;;), again to
- *   make compilers happy
- * - Changed type of window in inflateBackInit() to unsigned char *
- *
- * 1.2.beta7    27 Jan 2003
- * - Changed many types to unsigned or unsigned short to avoid warnings
- * - Added inflateCopy() function
- *
- * 1.2.0        9 Mar 2003
- * - Changed inflateBack() interface to provide separate opaque descriptors
- *   for the in() and out() functions
- * - Changed inflateBack() argument and in_func typedef to swap the length
- *   and buffer address return values for the input function
- * - Check next_in and next_out for Z_NULL on entry to inflate()
- *
- * The history for versions after 1.2.0 are in ChangeLog in zlib distribution.
- */
-
-#include "zutil.h"
-#include "inftrees.h"
-#include "inflate.h"
-#include "inffast.h"
-
-#ifdef MAKEFIXED
-#  ifndef BUILDFIXED
-#    define BUILDFIXED
-#  endif
-#endif
-
-/* function prototypes */
-local int inflateStateCheck OF((z_streamp strm));
-local void fixedtables OF((struct inflate_state FAR *state));
-local int updatewindow OF((z_streamp strm, const unsigned char FAR *end,
-                           unsigned copy));
-#ifdef BUILDFIXED
-   void makefixed OF((void));
-#endif
-local unsigned syncsearch OF((unsigned FAR *have, const unsigned char FAR *buf,
-                              unsigned len));
-
-local int inflateStateCheck(strm)
-z_streamp strm;
-{
-    struct inflate_state FAR *state;
-    if (strm == Z_NULL ||
-        strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0)
-        return 1;
-    state = (struct inflate_state FAR *)strm->state;
-    if (state == Z_NULL || state->strm != strm ||
-        state->mode < HEAD || state->mode > SYNC)
-        return 1;
-    return 0;
-}
-
-int ZEXPORT inflateResetKeep(strm)
-z_streamp strm;
-{
-    struct inflate_state FAR *state;
-
-    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-    strm->total_in = strm->total_out = state->total = 0;
-    strm->msg = Z_NULL;
-    if (state->wrap)        /* to support ill-conceived Java test suite */
-        strm->adler = state->wrap & 1;
-    state->mode = HEAD;
-    state->last = 0;
-    state->havedict = 0;
-    state->dmax = 32768U;
-    state->head = Z_NULL;
-    state->hold = 0;
-    state->bits = 0;
-    state->lencode = state->distcode = state->next = state->codes;
-    state->sane = 1;
-    state->back = -1;
-    Tracev((stderr, "inflate: reset\n"));
-    return Z_OK;
-}
-
-int ZEXPORT inflateReset(strm)
-z_streamp strm;
-{
-    struct inflate_state FAR *state;
-
-    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-    state->wsize = 0;
-    state->whave = 0;
-    state->wnext = 0;
-    return inflateResetKeep(strm);
-}
-
-int ZEXPORT inflateReset2(strm, windowBits)
-z_streamp strm;
-int windowBits;
-{
-    int wrap;
-    struct inflate_state FAR *state;
-
-    /* get the state */
-    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-
-    /* extract wrap request from windowBits parameter */
-    if (windowBits < 0) {
-        wrap = 0;
-        windowBits = -windowBits;
-    }
-    else {
-        wrap = (windowBits >> 4) + 5;
-#ifdef GUNZIP
-        if (windowBits < 48)
-            windowBits &= 15;
-#endif
-    }
-
-    /* set number of window bits, free window if different */
-    if (windowBits && (windowBits < 8 || windowBits > 15))
-        return Z_STREAM_ERROR;
-    if (state->window != Z_NULL && state->wbits != (unsigned)windowBits) {
-        ZFREE(strm, state->window);
-        state->window = Z_NULL;
-    }
-
-    /* update state and reset the rest of it */
-    state->wrap = wrap;
-    state->wbits = (unsigned)windowBits;
-    return inflateReset(strm);
-}
-
-int ZEXPORT inflateInit2_(strm, windowBits, version, stream_size)
-z_streamp strm;
-int windowBits;
-const char *version;
-int stream_size;
-{
-    int ret;
-    struct inflate_state FAR *state;
-
-    if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
-        stream_size != (int)(sizeof(z_stream)))
-        return Z_VERSION_ERROR;
-    if (strm == Z_NULL) return Z_STREAM_ERROR;
-    strm->msg = Z_NULL;                 /* in case we return an error */
-    if (strm->zalloc == (alloc_func)0) {
-#ifdef Z_SOLO
-        return Z_STREAM_ERROR;
-#else
-        strm->zalloc = zcalloc;
-        strm->opaque = (voidpf)0;
-#endif
-    }
-    if (strm->zfree == (free_func)0)
-#ifdef Z_SOLO
-        return Z_STREAM_ERROR;
-#else
-        strm->zfree = zcfree;
-#endif
-    state = (struct inflate_state FAR *)
-            ZALLOC(strm, 1, sizeof(struct inflate_state));
-    if (state == Z_NULL) return Z_MEM_ERROR;
-    Tracev((stderr, "inflate: allocated\n"));
-    strm->state = (struct internal_state FAR *)state;
-    state->strm = strm;
-    state->window = Z_NULL;
-    state->mode = HEAD;     /* to pass state test in inflateReset2() */
-    ret = inflateReset2(strm, windowBits);
-    if (ret != Z_OK) {
-        ZFREE(strm, state);
-        strm->state = Z_NULL;
-    }
-    return ret;
-}
-
-int ZEXPORT inflateInit_(strm, version, stream_size)
-z_streamp strm;
-const char *version;
-int stream_size;
-{
-    return inflateInit2_(strm, DEF_WBITS, version, stream_size);
-}
-
-int ZEXPORT inflatePrime(strm, bits, value)
-z_streamp strm;
-int bits;
-int value;
-{
-    struct inflate_state FAR *state;
-
-    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-    if (bits < 0) {
-        state->hold = 0;
-        state->bits = 0;
-        return Z_OK;
-    }
-    if (bits > 16 || state->bits + (uInt)bits > 32) return Z_STREAM_ERROR;
-    value &= (1L << bits) - 1;
-    state->hold += (unsigned)value << state->bits;
-    state->bits += (uInt)bits;
-    return Z_OK;
-}
-
-/*
-   Return state with length and distance decoding tables and index sizes set to
-   fixed code decoding.  Normally this returns fixed tables from inffixed.h.
-   If BUILDFIXED is defined, then instead this routine builds the tables the
-   first time it's called, and returns those tables the first time and
-   thereafter.  This reduces the size of the code by about 2K bytes, in
-   exchange for a little execution time.  However, BUILDFIXED should not be
-   used for threaded applications, since the rewriting of the tables and virgin
-   may not be thread-safe.
- */
-local void fixedtables(state)
-struct inflate_state FAR *state;
-{
-#ifdef BUILDFIXED
-    static int virgin = 1;
-    static code *lenfix, *distfix;
-    static code fixed[544];
-
-    /* build fixed huffman tables if first call (may not be thread safe) */
-    if (virgin) {
-        unsigned sym, bits;
-        static code *next;
-
-        /* literal/length table */
-        sym = 0;
-        while (sym < 144) state->lens[sym++] = 8;
-        while (sym < 256) state->lens[sym++] = 9;
-        while (sym < 280) state->lens[sym++] = 7;
-        while (sym < 288) state->lens[sym++] = 8;
-        next = fixed;
-        lenfix = next;
-        bits = 9;
-        inflate_table(LENS, state->lens, 288, &(next), &(bits), state->work);
-
-        /* distance table */
-        sym = 0;
-        while (sym < 32) state->lens[sym++] = 5;
-        distfix = next;
-        bits = 5;
-        inflate_table(DISTS, state->lens, 32, &(next), &(bits), state->work);
-
-        /* do this just once */
-        virgin = 0;
-    }
-#else /* !BUILDFIXED */
-#   include "inffixed.h"
-#endif /* BUILDFIXED */
-    state->lencode = lenfix;
-    state->lenbits = 9;
-    state->distcode = distfix;
-    state->distbits = 5;
-}
-
-#ifdef MAKEFIXED
-#include <stdio.h>
-
-/*
-   Write out the inffixed.h that is #include'd above.  Defining MAKEFIXED also
-   defines BUILDFIXED, so the tables are built on the fly.  makefixed() writes
-   those tables to stdout, which would be piped to inffixed.h.  A small program
-   can simply call makefixed to do this:
-
-    void makefixed(void);
-
-    int main(void)
-    {
-        makefixed();
-        return 0;
-    }
-
-   Then that can be linked with zlib built with MAKEFIXED defined and run:
-
-    a.out > inffixed.h
- */
-void makefixed()
-{
-    unsigned low, size;
-    struct inflate_state state;
-
-    fixedtables(&state);
-    puts("    /* inffixed.h -- table for decoding fixed codes");
-    puts("     * Generated automatically by makefixed().");
-    puts("     */");
-    puts("");
-    puts("    /* WARNING: this file should *not* be used by applications.");
-    puts("       It is part of the implementation of this library and is");
-    puts("       subject to change. Applications should only use zlib.h.");
-    puts("     */");
-    puts("");
-    size = 1U << 9;
-    printf("    static const code lenfix[%u] = {", size);
-    low = 0;
-    for (;;) {
-        if ((low % 7) == 0) printf("\n        ");
-        printf("{%u,%u,%d}", (low & 127) == 99 ? 64 : state.lencode[low].op,
-               state.lencode[low].bits, state.lencode[low].val);
-        if (++low == size) break;
-        putchar(',');
-    }
-    puts("\n    };");
-    size = 1U << 5;
-    printf("\n    static const code distfix[%u] = {", size);
-    low = 0;
-    for (;;) {
-        if ((low % 6) == 0) printf("\n        ");
-        printf("{%u,%u,%d}", state.distcode[low].op, state.distcode[low].bits,
-               state.distcode[low].val);
-        if (++low == size) break;
-        putchar(',');
-    }
-    puts("\n    };");
-}
-#endif /* MAKEFIXED */
-
-/*
-   Update the window with the last wsize (normally 32K) bytes written before
-   returning.  If window does not exist yet, create it.  This is only called
-   when a window is already in use, or when output has been written during this
-   inflate call, but the end of the deflate stream has not been reached yet.
-   It is also called to create a window for dictionary data when a dictionary
-   is loaded.
-
-   Providing output buffers larger than 32K to inflate() should provide a speed
-   advantage, since only the last 32K of output is copied to the sliding window
-   upon return from inflate(), and since all distances after the first 32K of
-   output will fall in the output data, making match copies simpler and faster.
-   The advantage may be dependent on the size of the processor's data caches.
- */
-local int updatewindow(strm, end, copy)
-z_streamp strm;
-const Bytef *end;
-unsigned copy;
-{
-    struct inflate_state FAR *state;
-    unsigned dist;
-
-    state = (struct inflate_state FAR *)strm->state;
-
-    /* if it hasn't been done already, allocate space for the window */
-    if (state->window == Z_NULL) {
-        state->window = (unsigned char FAR *)
-                        ZALLOC(strm, 1U << state->wbits,
-                               sizeof(unsigned char));
-        if (state->window == Z_NULL) return 1;
-    }
-
-    /* if window not in use yet, initialize */
-    if (state->wsize == 0) {
-        state->wsize = 1U << state->wbits;
-        state->wnext = 0;
-        state->whave = 0;
-    }
-
-    /* copy state->wsize or less output bytes into the circular window */
-    if (copy >= state->wsize) {
-        zmemcpy(state->window, end - state->wsize, state->wsize);
-        state->wnext = 0;
-        state->whave = state->wsize;
-    }
-    else {
-        dist = state->wsize - state->wnext;
-        if (dist > copy) dist = copy;
-        zmemcpy(state->window + state->wnext, end - copy, dist);
-        copy -= dist;
-        if (copy) {
-            zmemcpy(state->window, end - copy, copy);
-            state->wnext = copy;
-            state->whave = state->wsize;
-        }
-        else {
-            state->wnext += dist;
-            if (state->wnext == state->wsize) state->wnext = 0;
-            if (state->whave < state->wsize) state->whave += dist;
-        }
-    }
-    return 0;
-}
-
-/* Macros for inflate(): */
-
-/* check function to use adler32() for zlib or crc32() for gzip */
-#ifdef GUNZIP
-#  define UPDATE(check, buf, len) \
-    (state->flags ? crc32(check, buf, len) : adler32(check, buf, len))
-#else
-#  define UPDATE(check, buf, len) adler32(check, buf, len)
-#endif
-
-/* check macros for header crc */
-#ifdef GUNZIP
-#  define CRC2(check, word) \
-    do { \
-        hbuf[0] = (unsigned char)(word); \
-        hbuf[1] = (unsigned char)((word) >> 8); \
-        check = crc32(check, hbuf, 2); \
-    } while (0)
-
-#  define CRC4(check, word) \
-    do { \
-        hbuf[0] = (unsigned char)(word); \
-        hbuf[1] = (unsigned char)((word) >> 8); \
-        hbuf[2] = (unsigned char)((word) >> 16); \
-        hbuf[3] = (unsigned char)((word) >> 24); \
-        check = crc32(check, hbuf, 4); \
-    } while (0)
-#endif
-
-/* Load registers with state in inflate() for speed */
-#define LOAD() \
-    do { \
-        put = strm->next_out; \
-        left = strm->avail_out; \
-        next = strm->next_in; \
-        have = strm->avail_in; \
-        hold = state->hold; \
-        bits = state->bits; \
-    } while (0)
-
-/* Restore state from registers in inflate() */
-#define RESTORE() \
-    do { \
-        strm->next_out = put; \
-        strm->avail_out = left; \
-        strm->next_in = next; \
-        strm->avail_in = have; \
-        state->hold = hold; \
-        state->bits = bits; \
-    } while (0)
-
-/* Clear the input bit accumulator */
-#define INITBITS() \
-    do { \
-        hold = 0; \
-        bits = 0; \
-    } while (0)
-
-/* Get a byte of input into the bit accumulator, or return from inflate()
-   if there is no input available. */
-#define PULLBYTE() \
-    do { \
-        if (have == 0) goto inf_leave; \
-        have--; \
-        hold += (unsigned long)(*next++) << bits; \
-        bits += 8; \
-    } while (0)
-
-/* Assure that there are at least n bits in the bit accumulator.  If there is
-   not enough available input to do that, then return from inflate(). */
-#define NEEDBITS(n) \
-    do { \
-        while (bits < (unsigned)(n)) \
-            PULLBYTE(); \
-    } while (0)
-
-/* Return the low n bits of the bit accumulator (n < 16) */
-#define BITS(n) \
-    ((unsigned)hold & ((1U << (n)) - 1))
-
-/* Remove n bits from the bit accumulator */
-#define DROPBITS(n) \
-    do { \
-        hold >>= (n); \
-        bits -= (unsigned)(n); \
-    } while (0)
-
-/* Remove zero to seven bits as needed to go to a byte boundary */
-#define BYTEBITS() \
-    do { \
-        hold >>= bits & 7; \
-        bits -= bits & 7; \
-    } while (0)
-
-/*
-   inflate() uses a state machine to process as much input data and generate as
-   much output data as possible before returning.  The state machine is
-   structured roughly as follows:
-
-    for (;;) switch (state) {
-    ...
-    case STATEn:
-        if (not enough input data or output space to make progress)
-            return;
-        ... make progress ...
-        state = STATEm;
-        break;
-    ...
-    }
-
-   so when inflate() is called again, the same case is attempted again, and
-   if the appropriate resources are provided, the machine proceeds to the
-   next state.  The NEEDBITS() macro is usually the way the state evaluates
-   whether it can proceed or should return.  NEEDBITS() does the return if
-   the requested bits are not available.  The typical use of the BITS macros
-   is:
-
-        NEEDBITS(n);
-        ... do something with BITS(n) ...
-        DROPBITS(n);
-
-   where NEEDBITS(n) either returns from inflate() if there isn't enough
-   input left to load n bits into the accumulator, or it continues.  BITS(n)
-   gives the low n bits in the accumulator.  When done, DROPBITS(n) drops
-   the low n bits off the accumulator.  INITBITS() clears the accumulator
-   and sets the number of available bits to zero.  BYTEBITS() discards just
-   enough bits to put the accumulator on a byte boundary.  After BYTEBITS()
-   and a NEEDBITS(8), then BITS(8) would return the next byte in the stream.
-
-   NEEDBITS(n) uses PULLBYTE() to get an available byte of input, or to return
-   if there is no input available.  The decoding of variable length codes uses
-   PULLBYTE() directly in order to pull just enough bytes to decode the next
-   code, and no more.
-
-   Some states loop until they get enough input, making sure that enough
-   state information is maintained to continue the loop where it left off
-   if NEEDBITS() returns in the loop.  For example, want, need, and keep
-   would all have to actually be part of the saved state in case NEEDBITS()
-   returns:
-
-    case STATEw:
-        while (want < need) {
-            NEEDBITS(n);
-            keep[want++] = BITS(n);
-            DROPBITS(n);
-        }
-        state = STATEx;
-    case STATEx:
-
-   As shown above, if the next state is also the next case, then the break
-   is omitted.
-
-   A state may also return if there is not enough output space available to
-   complete that state.  Those states are copying stored data, writing a
-   literal byte, and copying a matching string.
-
-   When returning, a "goto inf_leave" is used to update the total counters,
-   update the check value, and determine whether any progress has been made
-   during that inflate() call in order to return the proper return code.
-   Progress is defined as a change in either strm->avail_in or strm->avail_out.
-   When there is a window, goto inf_leave will update the window with the last
-   output written.  If a goto inf_leave occurs in the middle of decompression
-   and there is no window currently, goto inf_leave will create one and copy
-   output to the window for the next call of inflate().
-
-   In this implementation, the flush parameter of inflate() only affects the
-   return code (per zlib.h).  inflate() always writes as much as possible to
-   strm->next_out, given the space available and the provided input--the effect
-   documented in zlib.h of Z_SYNC_FLUSH.  Furthermore, inflate() always defers
-   the allocation of and copying into a sliding window until necessary, which
-   provides the effect documented in zlib.h for Z_FINISH when the entire input
-   stream available.  So the only thing the flush parameter actually does is:
-   when flush is set to Z_FINISH, inflate() cannot return Z_OK.  Instead it
-   will return Z_BUF_ERROR if it has not reached the end of the stream.
- */
-
-int ZEXPORT inflate(strm, flush)
-z_streamp strm;
-int flush;
-{
-    struct inflate_state FAR *state;
-    z_const unsigned char FAR *next;    /* next input */
-    unsigned char FAR *put;     /* next output */
-    unsigned have, left;        /* available input and output */
-    unsigned long hold;         /* bit buffer */
-    unsigned bits;              /* bits in bit buffer */
-    unsigned in, out;           /* save starting available input and output */
-    unsigned copy;              /* number of stored or match bytes to copy */
-    unsigned char FAR *from;    /* where to copy match bytes from */
-    code here;                  /* current decoding table entry */
-    code last;                  /* parent table entry */
-    unsigned len;               /* length to copy for repeats, bits to drop */
-    int ret;                    /* return code */
-#ifdef GUNZIP
-    unsigned char hbuf[4];      /* buffer for gzip header crc calculation */
-#endif
-    static const unsigned short order[19] = /* permutation of code lengths */
-        {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
-
-    if (inflateStateCheck(strm) || strm->next_out == Z_NULL ||
-        (strm->next_in == Z_NULL && strm->avail_in != 0))
-        return Z_STREAM_ERROR;
-
-    state = (struct inflate_state FAR *)strm->state;
-    if (state->mode == TYPE) state->mode = TYPEDO;      /* skip check */
-    LOAD();
-    in = have;
-    out = left;
-    ret = Z_OK;
-    for (;;)
-        switch (state->mode) {
-        case HEAD:
-            if (state->wrap == 0) {
-                state->mode = TYPEDO;
-                break;
-            }
-            NEEDBITS(16);
-#ifdef GUNZIP
-            if ((state->wrap & 2) && hold == 0x8b1f) {  /* gzip header */
-                if (state->wbits == 0)
-                    state->wbits = 15;
-                state->check = crc32(0L, Z_NULL, 0);
-                CRC2(state->check, hold);
-                INITBITS();
-                state->mode = FLAGS;
-                break;
-            }
-            state->flags = 0;           /* expect zlib header */
-            if (state->head != Z_NULL)
-                state->head->done = -1;
-            if (!(state->wrap & 1) ||   /* check if zlib header allowed */
-#else
-            if (
-#endif
-                ((BITS(8) << 8) + (hold >> 8)) % 31) {
-                strm->msg = (char *)"incorrect header check";
-                state->mode = BAD;
-                break;
-            }
-            if (BITS(4) != Z_DEFLATED) {
-                strm->msg = (char *)"unknown compression method";
-                state->mode = BAD;
-                break;
-            }
-            DROPBITS(4);
-            len = BITS(4) + 8;
-            if (state->wbits == 0)
-                state->wbits = len;
-            if (len > 15 || len > state->wbits) {
-                strm->msg = (char *)"invalid window size";
-                state->mode = BAD;
-                break;
-            }
-            state->dmax = 1U << len;
-            Tracev((stderr, "inflate:   zlib header ok\n"));
-            strm->adler = state->check = adler32(0L, Z_NULL, 0);
-            state->mode = hold & 0x200 ? DICTID : TYPE;
-            INITBITS();
-            break;
-#ifdef GUNZIP
-        case FLAGS:
-            NEEDBITS(16);
-            state->flags = (int)(hold);
-            if ((state->flags & 0xff) != Z_DEFLATED) {
-                strm->msg = (char *)"unknown compression method";
-                state->mode = BAD;
-                break;
-            }
-            if (state->flags & 0xe000) {
-                strm->msg = (char *)"unknown header flags set";
-                state->mode = BAD;
-                break;
-            }
-            if (state->head != Z_NULL)
-                state->head->text = (int)((hold >> 8) & 1);
-            if ((state->flags & 0x0200) && (state->wrap & 4))
-                CRC2(state->check, hold);
-            INITBITS();
-            state->mode = TIME;
-        case TIME:
-            NEEDBITS(32);
-            if (state->head != Z_NULL)
-                state->head->time = hold;
-            if ((state->flags & 0x0200) && (state->wrap & 4))
-                CRC4(state->check, hold);
-            INITBITS();
-            state->mode = OS;
-        case OS:
-            NEEDBITS(16);
-            if (state->head != Z_NULL) {
-                state->head->xflags = (int)(hold & 0xff);
-                state->head->os = (int)(hold >> 8);
-            }
-            if ((state->flags & 0x0200) && (state->wrap & 4))
-                CRC2(state->check, hold);
-            INITBITS();
-            state->mode = EXLEN;
-        case EXLEN:
-            if (state->flags & 0x0400) {
-                NEEDBITS(16);
-                state->length = (unsigned)(hold);
-                if (state->head != Z_NULL)
-                    state->head->extra_len = (unsigned)hold;
-                if ((state->flags & 0x0200) && (state->wrap & 4))
-                    CRC2(state->check, hold);
-                INITBITS();
-            }
-            else if (state->head != Z_NULL)
-                state->head->extra = Z_NULL;
-            state->mode = EXTRA;
-        case EXTRA:
-            if (state->flags & 0x0400) {
-                copy = state->length;
-                if (copy > have) copy = have;
-                if (copy) {
-                    if (state->head != Z_NULL &&
-                        state->head->extra != Z_NULL) {
-                        len = state->head->extra_len - state->length;
-                        zmemcpy(state->head->extra + len, next,
-                                len + copy > state->head->extra_max ?
-                                state->head->extra_max - len : copy);
-                    }
-                    if ((state->flags & 0x0200) && (state->wrap & 4))
-                        state->check = crc32(state->check, next, copy);
-                    have -= copy;
-                    next += copy;
-                    state->length -= copy;
-                }
-                if (state->length) goto inf_leave;
-            }
-            state->length = 0;
-            state->mode = NAME;
-        case NAME:
-            if (state->flags & 0x0800) {
-                if (have == 0) goto inf_leave;
-                copy = 0;
-                do {
-                    len = (unsigned)(next[copy++]);
-                    if (state->head != Z_NULL &&
-                            state->head->name != Z_NULL &&
-                            state->length < state->head->name_max)
-                        state->head->name[state->length++] = (Bytef)len;
-                } while (len && copy < have);
-                if ((state->flags & 0x0200) && (state->wrap & 4))
-                    state->check = crc32(state->check, next, copy);
-                have -= copy;
-                next += copy;
-                if (len) goto inf_leave;
-            }
-            else if (state->head != Z_NULL)
-                state->head->name = Z_NULL;
-            state->length = 0;
-            state->mode = COMMENT;
-        case COMMENT:
-            if (state->flags & 0x1000) {
-                if (have == 0) goto inf_leave;
-                copy = 0;
-                do {
-                    len = (unsigned)(next[copy++]);
-                    if (state->head != Z_NULL &&
-                            state->head->comment != Z_NULL &&
-                            state->length < state->head->comm_max)
-                        state->head->comment[state->length++] = (Bytef)len;
-                } while (len && copy < have);
-                if ((state->flags & 0x0200) && (state->wrap & 4))
-                    state->check = crc32(state->check, next, copy);
-                have -= copy;
-                next += copy;
-                if (len) goto inf_leave;
-            }
-            else if (state->head != Z_NULL)
-                state->head->comment = Z_NULL;
-            state->mode = HCRC;
-        case HCRC:
-            if (state->flags & 0x0200) {
-                NEEDBITS(16);
-                if ((state->wrap & 4) && hold != (state->check & 0xffff)) {
-                    strm->msg = (char *)"header crc mismatch";
-                    state->mode = BAD;
-                    break;
-                }
-                INITBITS();
-            }
-            if (state->head != Z_NULL) {
-                state->head->hcrc = (int)((state->flags >> 9) & 1);
-                state->head->done = 1;
-            }
-            strm->adler = state->check = crc32(0L, Z_NULL, 0);
-            state->mode = TYPE;
-            break;
-#endif
-        case DICTID:
-            NEEDBITS(32);
-            strm->adler = state->check = ZSWAP32(hold);
-            INITBITS();
-            state->mode = DICT;
-        case DICT:
-            if (state->havedict == 0) {
-                RESTORE();
-                return Z_NEED_DICT;
-            }
-            strm->adler = state->check = adler32(0L, Z_NULL, 0);
-            state->mode = TYPE;
-        case TYPE:
-            if (flush == Z_BLOCK || flush == Z_TREES) goto inf_leave;
-        case TYPEDO:
-            if (state->last) {
-                BYTEBITS();
-                state->mode = CHECK;
-                break;
-            }
-            NEEDBITS(3);
-            state->last = BITS(1);
-            DROPBITS(1);
-            switch (BITS(2)) {
-            case 0:                             /* stored block */
-                Tracev((stderr, "inflate:     stored block%s\n",
-                        state->last ? " (last)" : ""));
-                state->mode = STORED;
-                break;
-            case 1:                             /* fixed block */
-                fixedtables(state);
-                Tracev((stderr, "inflate:     fixed codes block%s\n",
-                        state->last ? " (last)" : ""));
-                state->mode = LEN_;             /* decode codes */
-                if (flush == Z_TREES) {
-                    DROPBITS(2);
-                    goto inf_leave;
-                }
-                break;
-            case 2:                             /* dynamic block */
-                Tracev((stderr, "inflate:     dynamic codes block%s\n",
-                        state->last ? " (last)" : ""));
-                state->mode = TABLE;
-                break;
-            case 3:
-                strm->msg = (char *)"invalid block type";
-                state->mode = BAD;
-            }
-            DROPBITS(2);
-            break;
-        case STORED:
-            BYTEBITS();                         /* go to byte boundary */
-            NEEDBITS(32);
-            if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) {
-                strm->msg = (char *)"invalid stored block lengths";
-                state->mode = BAD;
-                break;
-            }
-            state->length = (unsigned)hold & 0xffff;
-            Tracev((stderr, "inflate:       stored length %u\n",
-                    state->length));
-            INITBITS();
-            state->mode = COPY_;
-            if (flush == Z_TREES) goto inf_leave;
-        case COPY_:
-            state->mode = COPY;
-        case COPY:
-            copy = state->length;
-            if (copy) {
-                if (copy > have) copy = have;
-                if (copy > left) copy = left;
-                if (copy == 0) goto inf_leave;
-                zmemcpy(put, next, copy);
-                have -= copy;
-                next += copy;
-                left -= copy;
-                put += copy;
-                state->length -= copy;
-                break;
-            }
-            Tracev((stderr, "inflate:       stored end\n"));
-            state->mode = TYPE;
-            break;
-        case TABLE:
-            NEEDBITS(14);
-            state->nlen = BITS(5) + 257;
-            DROPBITS(5);
-            state->ndist = BITS(5) + 1;
-            DROPBITS(5);
-            state->ncode = BITS(4) + 4;
-            DROPBITS(4);
-#ifndef PKZIP_BUG_WORKAROUND
-            if (state->nlen > 286 || state->ndist > 30) {
-                strm->msg = (char *)"too many length or distance symbols";
-                state->mode = BAD;
-                break;
-            }
-#endif
-            Tracev((stderr, "inflate:       table sizes ok\n"));
-            state->have = 0;
-            state->mode = LENLENS;
-        case LENLENS:
-            while (state->have < state->ncode) {
-                NEEDBITS(3);
-                state->lens[order[state->have++]] = (unsigned short)BITS(3);
-                DROPBITS(3);
-            }
-            while (state->have < 19)
-                state->lens[order[state->have++]] = 0;
-            state->next = state->codes;
-            state->lencode = (const code FAR *)(state->next);
-            state->lenbits = 7;
-            ret = inflate_table(CODES, state->lens, 19, &(state->next),
-                                &(state->lenbits), state->work);
-            if (ret) {
-                strm->msg = (char *)"invalid code lengths set";
-                state->mode = BAD;
-                break;
-            }
-            Tracev((stderr, "inflate:       code lengths ok\n"));
-            state->have = 0;
-            state->mode = CODELENS;
-        case CODELENS:
-            while (state->have < state->nlen + state->ndist) {
-                for (;;) {
-                    here = state->lencode[BITS(state->lenbits)];
-                    if ((unsigned)(here.bits) <= bits) break;
-                    PULLBYTE();
-                }
-                if (here.val < 16) {
-                    DROPBITS(here.bits);
-                    state->lens[state->have++] = here.val;
-                }
-                else {
-                    if (here.val == 16) {
-                        NEEDBITS(here.bits + 2);
-                        DROPBITS(here.bits);
-                        if (state->have == 0) {
-                            strm->msg = (char *)"invalid bit length repeat";
-                            state->mode = BAD;
-                            break;
-                        }
-                        len = state->lens[state->have - 1];
-                        copy = 3 + BITS(2);
-                        DROPBITS(2);
-                    }
-                    else if (here.val == 17) {
-                        NEEDBITS(here.bits + 3);
-                        DROPBITS(here.bits);
-                        len = 0;
-                        copy = 3 + BITS(3);
-                        DROPBITS(3);
-                    }
-                    else {
-                        NEEDBITS(here.bits + 7);
-                        DROPBITS(here.bits);
-                        len = 0;
-                        copy = 11 + BITS(7);
-                        DROPBITS(7);
-                    }
-                    if (state->have + copy > state->nlen + state->ndist) {
-                        strm->msg = (char *)"invalid bit length repeat";
-                        state->mode = BAD;
-                        break;
-                    }
-                    while (copy--)
-                        state->lens[state->have++] = (unsigned short)len;
-                }
-            }
-
-            /* handle error breaks in while */
-            if (state->mode == BAD) break;
-
-            /* check for end-of-block code (better have one) */
-            if (state->lens[256] == 0) {
-                strm->msg = (char *)"invalid code -- missing end-of-block";
-                state->mode = BAD;
-                break;
-            }
-
-            /* build code tables -- note: do not change the lenbits or distbits
-               values here (9 and 6) without reading the comments in inftrees.h
-               concerning the ENOUGH constants, which depend on those values */
-            state->next = state->codes;
-            state->lencode = (const code FAR *)(state->next);
-            state->lenbits = 9;
-            ret = inflate_table(LENS, state->lens, state->nlen, &(state->next),
-                                &(state->lenbits), state->work);
-            if (ret) {
-                strm->msg = (char *)"invalid literal/lengths set";
-                state->mode = BAD;
-                break;
-            }
-            state->distcode = (const code FAR *)(state->next);
-            state->distbits = 6;
-            ret = inflate_table(DISTS, state->lens + state->nlen, state->ndist,
-                            &(state->next), &(state->distbits), state->work);
-            if (ret) {
-                strm->msg = (char *)"invalid distances set";
-                state->mode = BAD;
-                break;
-            }
-            Tracev((stderr, "inflate:       codes ok\n"));
-            state->mode = LEN_;
-            if (flush == Z_TREES) goto inf_leave;
-        case LEN_:
-            state->mode = LEN;
-        case LEN:
-            if (have >= 6 && left >= 258) {
-                RESTORE();
-                inflate_fast(strm, out);
-                LOAD();
-                if (state->mode == TYPE)
-                    state->back = -1;
-                break;
-            }
-            state->back = 0;
-            for (;;) {
-                here = state->lencode[BITS(state->lenbits)];
-                if ((unsigned)(here.bits) <= bits) break;
-                PULLBYTE();
-            }
-            if (here.op && (here.op & 0xf0) == 0) {
-                last = here;
-                for (;;) {
-                    here = state->lencode[last.val +
-                            (BITS(last.bits + last.op) >> last.bits)];
-                    if ((unsigned)(last.bits + here.bits) <= bits) break;
-                    PULLBYTE();
-                }
-                DROPBITS(last.bits);
-                state->back += last.bits;
-            }
-            DROPBITS(here.bits);
-            state->back += here.bits;
-            state->length = (unsigned)here.val;
-            if ((int)(here.op) == 0) {
-                Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
-                        "inflate:         literal '%c'\n" :
-                        "inflate:         literal 0x%02x\n", here.val));
-                state->mode = LIT;
-                break;
-            }
-            if (here.op & 32) {
-                Tracevv((stderr, "inflate:         end of block\n"));
-                state->back = -1;
-                state->mode = TYPE;
-                break;
-            }
-            if (here.op & 64) {
-                strm->msg = (char *)"invalid literal/length code";
-                state->mode = BAD;
-                break;
-            }
-            state->extra = (unsigned)(here.op) & 15;
-            state->mode = LENEXT;
-        case LENEXT:
-            if (state->extra) {
-                NEEDBITS(state->extra);
-                state->length += BITS(state->extra);
-                DROPBITS(state->extra);
-                state->back += state->extra;
-            }
-            Tracevv((stderr, "inflate:         length %u\n", state->length));
-            state->was = state->length;
-            state->mode = DIST;
-        case DIST:
-            for (;;) {
-                here = state->distcode[BITS(state->distbits)];
-                if ((unsigned)(here.bits) <= bits) break;
-                PULLBYTE();
-            }
-            if ((here.op & 0xf0) == 0) {
-                last = here;
-                for (;;) {
-                    here = state->distcode[last.val +
-                            (BITS(last.bits + last.op) >> last.bits)];
-                    if ((unsigned)(last.bits + here.bits) <= bits) break;
-                    PULLBYTE();
-                }
-                DROPBITS(last.bits);
-                state->back += last.bits;
-            }
-            DROPBITS(here.bits);
-            state->back += here.bits;
-            if (here.op & 64) {
-                strm->msg = (char *)"invalid distance code";
-                state->mode = BAD;
-                break;
-            }
-            state->offset = (unsigned)here.val;
-            state->extra = (unsigned)(here.op) & 15;
-            state->mode = DISTEXT;
-        case DISTEXT:
-            if (state->extra) {
-                NEEDBITS(state->extra);
-                state->offset += BITS(state->extra);
-                DROPBITS(state->extra);
-                state->back += state->extra;
-            }
-#ifdef INFLATE_STRICT
-            if (state->offset > state->dmax) {
-                strm->msg = (char *)"invalid distance too far back";
-                state->mode = BAD;
-                break;
-            }
-#endif
-            Tracevv((stderr, "inflate:         distance %u\n", state->offset));
-            state->mode = MATCH;
-        case MATCH:
-            if (left == 0) goto inf_leave;
-            copy = out - left;
-            if (state->offset > copy) {         /* copy from window */
-                copy = state->offset - copy;
-                if (copy > state->whave) {
-                    if (state->sane) {
-                        strm->msg = (char *)"invalid distance too far back";
-                        state->mode = BAD;
-                        break;
-                    }
-#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
-                    Trace((stderr, "inflate.c too far\n"));
-                    copy -= state->whave;
-                    if (copy > state->length) copy = state->length;
-                    if (copy > left) copy = left;
-                    left -= copy;
-                    state->length -= copy;
-                    do {
-                        *put++ = 0;
-                    } while (--copy);
-                    if (state->length == 0) state->mode = LEN;
-                    break;
-#endif
-                }
-                if (copy > state->wnext) {
-                    copy -= state->wnext;
-                    from = state->window + (state->wsize - copy);
-                }
-                else
-                    from = state->window + (state->wnext - copy);
-                if (copy > state->length) copy = state->length;
-            }
-            else {                              /* copy from output */
-                from = put - state->offset;
-                copy = state->length;
-            }
-            if (copy > left) copy = left;
-            left -= copy;
-            state->length -= copy;
-            do {
-                *put++ = *from++;
-            } while (--copy);
-            if (state->length == 0) state->mode = LEN;
-            break;
-        case LIT:
-            if (left == 0) goto inf_leave;
-            *put++ = (unsigned char)(state->length);
-            left--;
-            state->mode = LEN;
-            break;
-        case CHECK:
-            if (state->wrap) {
-                NEEDBITS(32);
-                out -= left;
-                strm->total_out += out;
-                state->total += out;
-                if ((state->wrap & 4) && out)
-                    strm->adler = state->check =
-                        UPDATE(state->check, put - out, out);
-                out = left;
-                if ((state->wrap & 4) && (
-#ifdef GUNZIP
-                     state->flags ? hold :
-#endif
-                     ZSWAP32(hold)) != state->check) {
-                    strm->msg = (char *)"incorrect data check";
-                    state->mode = BAD;
-                    break;
-                }
-                INITBITS();
-                Tracev((stderr, "inflate:   check matches trailer\n"));
-            }
-#ifdef GUNZIP
-            state->mode = LENGTH;
-        case LENGTH:
-            if (state->wrap && state->flags) {
-                NEEDBITS(32);
-                if (hold != (state->total & 0xffffffffUL)) {
-                    strm->msg = (char *)"incorrect length check";
-                    state->mode = BAD;
-                    break;
-                }
-                INITBITS();
-                Tracev((stderr, "inflate:   length matches trailer\n"));
-            }
-#endif
-            state->mode = DONE;
-        case DONE:
-            ret = Z_STREAM_END;
-            goto inf_leave;
-        case BAD:
-            ret = Z_DATA_ERROR;
-            goto inf_leave;
-        case MEM:
-            return Z_MEM_ERROR;
-        case SYNC:
-        default:
-            return Z_STREAM_ERROR;
-        }
-
-    /*
-       Return from inflate(), updating the total counts and the check value.
-       If there was no progress during the inflate() call, return a buffer
-       error.  Call updatewindow() to create and/or update the window state.
-       Note: a memory error from inflate() is non-recoverable.
-     */
-  inf_leave:
-    RESTORE();
-    if (state->wsize || (out != strm->avail_out && state->mode < BAD &&
-            (state->mode < CHECK || flush != Z_FINISH)))
-        if (updatewindow(strm, strm->next_out, out - strm->avail_out)) {
-            state->mode = MEM;
-            return Z_MEM_ERROR;
-        }
-    in -= strm->avail_in;
-    out -= strm->avail_out;
-    strm->total_in += in;
-    strm->total_out += out;
-    state->total += out;
-    if ((state->wrap & 4) && out)
-        strm->adler = state->check =
-            UPDATE(state->check, strm->next_out - out, out);
-    strm->data_type = (int)state->bits + (state->last ? 64 : 0) +
-                      (state->mode == TYPE ? 128 : 0) +
-                      (state->mode == LEN_ || state->mode == COPY_ ? 256 : 0);
-    if (((in == 0 && out == 0) || flush == Z_FINISH) && ret == Z_OK)
-        ret = Z_BUF_ERROR;
-    return ret;
-}
-
-int ZEXPORT inflateEnd(strm)
-z_streamp strm;
-{
-    struct inflate_state FAR *state;
-    if (inflateStateCheck(strm))
-        return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-    if (state->window != Z_NULL) ZFREE(strm, state->window);
-    ZFREE(strm, strm->state);
-    strm->state = Z_NULL;
-    Tracev((stderr, "inflate: end\n"));
-    return Z_OK;
-}
-
-int ZEXPORT inflateGetDictionary(strm, dictionary, dictLength)
-z_streamp strm;
-Bytef *dictionary;
-uInt *dictLength;
-{
-    struct inflate_state FAR *state;
-
-    /* check state */
-    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-
-    /* copy dictionary */
-    if (state->whave && dictionary != Z_NULL) {
-        zmemcpy(dictionary, state->window + state->wnext,
-                state->whave - state->wnext);
-        zmemcpy(dictionary + state->whave - state->wnext,
-                state->window, state->wnext);
-    }
-    if (dictLength != Z_NULL)
-        *dictLength = state->whave;
-    return Z_OK;
-}
-
-int ZEXPORT inflateSetDictionary(strm, dictionary, dictLength)
-z_streamp strm;
-const Bytef *dictionary;
-uInt dictLength;
-{
-    struct inflate_state FAR *state;
-    unsigned long dictid;
-    int ret;
-
-    /* check state */
-    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-    if (state->wrap != 0 && state->mode != DICT)
-        return Z_STREAM_ERROR;
-
-    /* check for correct dictionary identifier */
-    if (state->mode == DICT) {
-        dictid = adler32(0L, Z_NULL, 0);
-        dictid = adler32(dictid, dictionary, dictLength);
-        if (dictid != state->check)
-            return Z_DATA_ERROR;
-    }
-
-    /* copy dictionary to window using updatewindow(), which will amend the
-       existing dictionary if appropriate */
-    ret = updatewindow(strm, dictionary + dictLength, dictLength);
-    if (ret) {
-        state->mode = MEM;
-        return Z_MEM_ERROR;
-    }
-    state->havedict = 1;
-    Tracev((stderr, "inflate:   dictionary set\n"));
-    return Z_OK;
-}
-
-int ZEXPORT inflateGetHeader(strm, head)
-z_streamp strm;
-gz_headerp head;
-{
-    struct inflate_state FAR *state;
-
-    /* check state */
-    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-    if ((state->wrap & 2) == 0) return Z_STREAM_ERROR;
-
-    /* save header structure */
-    state->head = head;
-    head->done = 0;
-    return Z_OK;
-}
-
-/*
-   Search buf[0..len-1] for the pattern: 0, 0, 0xff, 0xff.  Return when found
-   or when out of input.  When called, *have is the number of pattern bytes
-   found in order so far, in 0..3.  On return *have is updated to the new
-   state.  If on return *have equals four, then the pattern was found and the
-   return value is how many bytes were read including the last byte of the
-   pattern.  If *have is less than four, then the pattern has not been found
-   yet and the return value is len.  In the latter case, syncsearch() can be
-   called again with more data and the *have state.  *have is initialized to
-   zero for the first call.
- */
-local unsigned syncsearch(have, buf, len)
-unsigned FAR *have;
-const unsigned char FAR *buf;
-unsigned len;
-{
-    unsigned got;
-    unsigned next;
-
-    got = *have;
-    next = 0;
-    while (next < len && got < 4) {
-        if ((int)(buf[next]) == (got < 2 ? 0 : 0xff))
-            got++;
-        else if (buf[next])
-            got = 0;
-        else
-            got = 4 - got;
-        next++;
-    }
-    *have = got;
-    return next;
-}
-
-int ZEXPORT inflateSync(strm)
-z_streamp strm;
-{
-    unsigned len;               /* number of bytes to look at or looked at */
-    unsigned long in, out;      /* temporary to save total_in and total_out */
-    unsigned char buf[4];       /* to restore bit buffer to byte string */
-    struct inflate_state FAR *state;
-
-    /* check parameters */
-    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-    if (strm->avail_in == 0 && state->bits < 8) return Z_BUF_ERROR;
-
-    /* if first time, start search in bit buffer */
-    if (state->mode != SYNC) {
-        state->mode = SYNC;
-        state->hold <<= state->bits & 7;
-        state->bits -= state->bits & 7;
-        len = 0;
-        while (state->bits >= 8) {
-            buf[len++] = (unsigned char)(state->hold);
-            state->hold >>= 8;
-            state->bits -= 8;
-        }
-        state->have = 0;
-        syncsearch(&(state->have), buf, len);
-    }
-
-    /* search available input */
-    len = syncsearch(&(state->have), strm->next_in, strm->avail_in);
-    strm->avail_in -= len;
-    strm->next_in += len;
-    strm->total_in += len;
-
-    /* return no joy or set up to restart inflate() on a new block */
-    if (state->have != 4) return Z_DATA_ERROR;
-    in = strm->total_in;  out = strm->total_out;
-    inflateReset(strm);
-    strm->total_in = in;  strm->total_out = out;
-    state->mode = TYPE;
-    return Z_OK;
-}
-
-/*
-   Returns true if inflate is currently at the end of a block generated by
-   Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
-   implementation to provide an additional safety check. PPP uses
-   Z_SYNC_FLUSH but removes the length bytes of the resulting empty stored
-   block. When decompressing, PPP checks that at the end of input packet,
-   inflate is waiting for these length bytes.
- */
-int ZEXPORT inflateSyncPoint(strm)
-z_streamp strm;
-{
-    struct inflate_state FAR *state;
-
-    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-    return state->mode == STORED && state->bits == 0;
-}
-
-int ZEXPORT inflateCopy(dest, source)
-z_streamp dest;
-z_streamp source;
-{
-    struct inflate_state FAR *state;
-    struct inflate_state FAR *copy;
-    unsigned char FAR *window;
-    unsigned wsize;
-
-    /* check input */
-    if (inflateStateCheck(source) || dest == Z_NULL)
-        return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)source->state;
-
-    /* allocate space */
-    copy = (struct inflate_state FAR *)
-           ZALLOC(source, 1, sizeof(struct inflate_state));
-    if (copy == Z_NULL) return Z_MEM_ERROR;
-    window = Z_NULL;
-    if (state->window != Z_NULL) {
-        window = (unsigned char FAR *)
-                 ZALLOC(source, 1U << state->wbits, sizeof(unsigned char));
-        if (window == Z_NULL) {
-            ZFREE(source, copy);
-            return Z_MEM_ERROR;
-        }
-    }
-
-    /* copy state */
-    zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream));
-    zmemcpy((voidpf)copy, (voidpf)state, sizeof(struct inflate_state));
-    copy->strm = dest;
-    if (state->lencode >= state->codes &&
-        state->lencode <= state->codes + ENOUGH - 1) {
-        copy->lencode = copy->codes + (state->lencode - state->codes);
-        copy->distcode = copy->codes + (state->distcode - state->codes);
-    }
-    copy->next = copy->codes + (state->next - state->codes);
-    if (window != Z_NULL) {
-        wsize = 1U << state->wbits;
-        zmemcpy(window, state->window, wsize);
-    }
-    copy->window = window;
-    dest->state = (struct internal_state FAR *)copy;
-    return Z_OK;
-}
-
-int ZEXPORT inflateUndermine(strm, subvert)
-z_streamp strm;
-int subvert;
-{
-    struct inflate_state FAR *state;
-
-    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
-    state->sane = !subvert;
-    return Z_OK;
-#else
-    (void)subvert;
-    state->sane = 1;
-    return Z_DATA_ERROR;
-#endif
-}
-
-int ZEXPORT inflateValidate(strm, check)
-z_streamp strm;
-int check;
-{
-    struct inflate_state FAR *state;
-
-    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
-    state = (struct inflate_state FAR *)strm->state;
-    if (check)
-        state->wrap |= 4;
-    else
-        state->wrap &= ~4;
-    return Z_OK;
-}
-
-long ZEXPORT inflateMark(strm)
-z_streamp strm;
-{
-    struct inflate_state FAR *state;
-
-    if (inflateStateCheck(strm))
-        return -(1L << 16);
-    state = (struct inflate_state FAR *)strm->state;
-    return (long)(((unsigned long)((long)state->back)) << 16) +
-        (state->mode == COPY ? state->length :
-            (state->mode == MATCH ? state->was - state->length : 0));
-}
-
-unsigned long ZEXPORT inflateCodesUsed(strm)
-z_streamp strm;
-{
-    struct inflate_state FAR *state;
-    if (inflateStateCheck(strm)) return (unsigned long)-1;
-    state = (struct inflate_state FAR *)strm->state;
-    return (unsigned long)(state->next - state->codes);
-}
diff --git a/src/png/zlib/inflate.h b/src/png/zlib/inflate.h
deleted file mode 100644
index a46cce6b6..000000000
--- a/src/png/zlib/inflate.h
+++ /dev/null
@@ -1,125 +0,0 @@
-/* inflate.h -- internal inflate state definition
- * Copyright (C) 1995-2016 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* WARNING: this file should *not* be used by applications. It is
-   part of the implementation of the compression library and is
-   subject to change. Applications should only use zlib.h.
- */
-
-/* define NO_GZIP when compiling if you want to disable gzip header and
-   trailer decoding by inflate().  NO_GZIP would be used to avoid linking in
-   the crc code when it is not needed.  For shared libraries, gzip decoding
-   should be left enabled. */
-#ifndef NO_GZIP
-#  define GUNZIP
-#endif
-
-/* Possible inflate modes between inflate() calls */
-typedef enum {
-    HEAD = 16180,   /* i: waiting for magic header */
-    FLAGS,      /* i: waiting for method and flags (gzip) */
-    TIME,       /* i: waiting for modification time (gzip) */
-    OS,         /* i: waiting for extra flags and operating system (gzip) */
-    EXLEN,      /* i: waiting for extra length (gzip) */
-    EXTRA,      /* i: waiting for extra bytes (gzip) */
-    NAME,       /* i: waiting for end of file name (gzip) */
-    COMMENT,    /* i: waiting for end of comment (gzip) */
-    HCRC,       /* i: waiting for header crc (gzip) */
-    DICTID,     /* i: waiting for dictionary check value */
-    DICT,       /* waiting for inflateSetDictionary() call */
-        TYPE,       /* i: waiting for type bits, including last-flag bit */
-        TYPEDO,     /* i: same, but skip check to exit inflate on new block */
-        STORED,     /* i: waiting for stored size (length and complement) */
-        COPY_,      /* i/o: same as COPY below, but only first time in */
-        COPY,       /* i/o: waiting for input or output to copy stored block */
-        TABLE,      /* i: waiting for dynamic block table lengths */
-        LENLENS,    /* i: waiting for code length code lengths */
-        CODELENS,   /* i: waiting for length/lit and distance code lengths */
-            LEN_,       /* i: same as LEN below, but only first time in */
-            LEN,        /* i: waiting for length/lit/eob code */
-            LENEXT,     /* i: waiting for length extra bits */
-            DIST,       /* i: waiting for distance code */
-            DISTEXT,    /* i: waiting for distance extra bits */
-            MATCH,      /* o: waiting for output space to copy string */
-            LIT,        /* o: waiting for output space to write literal */
-    CHECK,      /* i: waiting for 32-bit check value */
-    LENGTH,     /* i: waiting for 32-bit length (gzip) */
-    DONE,       /* finished check, done -- remain here until reset */
-    BAD,        /* got a data error -- remain here until reset */
-    MEM,        /* got an inflate() memory error -- remain here until reset */
-    SYNC        /* looking for synchronization bytes to restart inflate() */
-} inflate_mode;
-
-/*
-    State transitions between above modes -
-
-    (most modes can go to BAD or MEM on error -- not shown for clarity)
-
-    Process header:
-        HEAD -> (gzip) or (zlib) or (raw)
-        (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME -> COMMENT ->
-                  HCRC -> TYPE
-        (zlib) -> DICTID or TYPE
-        DICTID -> DICT -> TYPE
-        (raw) -> TYPEDO
-    Read deflate blocks:
-            TYPE -> TYPEDO -> STORED or TABLE or LEN_ or CHECK
-            STORED -> COPY_ -> COPY -> TYPE
-            TABLE -> LENLENS -> CODELENS -> LEN_
-            LEN_ -> LEN
-    Read deflate codes in fixed or dynamic block:
-                LEN -> LENEXT or LIT or TYPE
-                LENEXT -> DIST -> DISTEXT -> MATCH -> LEN
-                LIT -> LEN
-    Process trailer:
-        CHECK -> LENGTH -> DONE
- */
-
-/* State maintained between inflate() calls -- approximately 7K bytes, not
-   including the allocated sliding window, which is up to 32K bytes. */
-struct inflate_state {
-    z_streamp strm;             /* pointer back to this zlib stream */
-    inflate_mode mode;          /* current inflate mode */
-    int last;                   /* true if processing last block */
-    int wrap;                   /* bit 0 true for zlib, bit 1 true for gzip,
-                                   bit 2 true to validate check value */
-    int havedict;               /* true if dictionary provided */
-    int flags;                  /* gzip header method and flags (0 if zlib) */
-    unsigned dmax;              /* zlib header max distance (INFLATE_STRICT) */
-    unsigned long check;        /* protected copy of check value */
-    unsigned long total;        /* protected copy of output count */
-    gz_headerp head;            /* where to save gzip header information */
-        /* sliding window */
-    unsigned wbits;             /* log base 2 of requested window size */
-    unsigned wsize;             /* window size or zero if not using window */
-    unsigned whave;             /* valid bytes in the window */
-    unsigned wnext;             /* window write index */
-    unsigned char FAR *window;  /* allocated sliding window, if needed */
-        /* bit accumulator */
-    unsigned long hold;         /* input bit accumulator */
-    unsigned bits;              /* number of bits in "in" */
-        /* for string and stored block copying */
-    unsigned length;            /* literal or length of data to copy */
-    unsigned offset;            /* distance back to copy string from */
-        /* for table and code decoding */
-    unsigned extra;             /* extra bits needed */
-        /* fixed and dynamic code tables */
-    code const FAR *lencode;    /* starting table for length/literal codes */
-    code const FAR *distcode;   /* starting table for distance codes */
-    unsigned lenbits;           /* index bits for lencode */
-    unsigned distbits;          /* index bits for distcode */
-        /* dynamic table building */
-    unsigned ncode;             /* number of code length code lengths */
-    unsigned nlen;              /* number of length code lengths */
-    unsigned ndist;             /* number of distance code lengths */
-    unsigned have;              /* number of code lengths in lens[] */
-    code FAR *next;             /* next available space in codes[] */
-    unsigned short lens[320];   /* temporary storage for code lengths */
-    unsigned short work[288];   /* work area for code table building */
-    code codes[ENOUGH];         /* space for code tables */
-    int sane;                   /* if false, allow invalid distance too far */
-    int back;                   /* bits back of last unprocessed length/lit */
-    unsigned was;               /* initial length of match */
-};
diff --git a/src/png/zlib/inftrees.c b/src/png/zlib/inftrees.c
deleted file mode 100644
index 2ea08fc13..000000000
--- a/src/png/zlib/inftrees.c
+++ /dev/null
@@ -1,304 +0,0 @@
-/* inftrees.c -- generate Huffman trees for efficient decoding
- * Copyright (C) 1995-2017 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-#include "zutil.h"
-#include "inftrees.h"
-
-#define MAXBITS 15
-
-const char inflate_copyright[] =
-   " inflate 1.2.11 Copyright 1995-2017 Mark Adler ";
-/*
-  If you use the zlib library in a product, an acknowledgment is welcome
-  in the documentation of your product. If for some reason you cannot
-  include such an acknowledgment, I would appreciate that you keep this
-  copyright string in the executable of your product.
- */
-
-/*
-   Build a set of tables to decode the provided canonical Huffman code.
-   The code lengths are lens[0..codes-1].  The result starts at *table,
-   whose indices are 0..2^bits-1.  work is a writable array of at least
-   lens shorts, which is used as a work area.  type is the type of code
-   to be generated, CODES, LENS, or DISTS.  On return, zero is success,
-   -1 is an invalid code, and +1 means that ENOUGH isn't enough.  table
-   on return points to the next available entry's address.  bits is the
-   requested root table index bits, and on return it is the actual root
-   table index bits.  It will differ if the request is greater than the
-   longest code or if it is less than the shortest code.
- */
-int ZLIB_INTERNAL inflate_table(type, lens, codes, table, bits, work)
-codetype type;
-unsigned short FAR *lens;
-unsigned codes;
-code FAR * FAR *table;
-unsigned FAR *bits;
-unsigned short FAR *work;
-{
-    unsigned len;               /* a code's length in bits */
-    unsigned sym;               /* index of code symbols */
-    unsigned min, max;          /* minimum and maximum code lengths */
-    unsigned root;              /* number of index bits for root table */
-    unsigned curr;              /* number of index bits for current table */
-    unsigned drop;              /* code bits to drop for sub-table */
-    int left;                   /* number of prefix codes available */
-    unsigned used;              /* code entries in table used */
-    unsigned huff;              /* Huffman code */
-    unsigned incr;              /* for incrementing code, index */
-    unsigned fill;              /* index for replicating entries */
-    unsigned low;               /* low bits for current root entry */
-    unsigned mask;              /* mask for low root bits */
-    code here;                  /* table entry for duplication */
-    code FAR *next;             /* next available space in table */
-    const unsigned short FAR *base;     /* base value table to use */
-    const unsigned short FAR *extra;    /* extra bits table to use */
-    unsigned match;             /* use base and extra for symbol >= match */
-    unsigned short count[MAXBITS+1];    /* number of codes of each length */
-    unsigned short offs[MAXBITS+1];     /* offsets in table for each length */
-    static const unsigned short lbase[31] = { /* Length codes 257..285 base */
-        3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
-        35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
-    static const unsigned short lext[31] = { /* Length codes 257..285 extra */
-        16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
-        19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 77, 202};
-    static const unsigned short dbase[32] = { /* Distance codes 0..29 base */
-        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
-        257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
-        8193, 12289, 16385, 24577, 0, 0};
-    static const unsigned short dext[32] = { /* Distance codes 0..29 extra */
-        16, 16, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22,
-        23, 23, 24, 24, 25, 25, 26, 26, 27, 27,
-        28, 28, 29, 29, 64, 64};
-
-    /*
-       Process a set of code lengths to create a canonical Huffman code.  The
-       code lengths are lens[0..codes-1].  Each length corresponds to the
-       symbols 0..codes-1.  The Huffman code is generated by first sorting the
-       symbols by length from short to long, and retaining the symbol order
-       for codes with equal lengths.  Then the code starts with all zero bits
-       for the first code of the shortest length, and the codes are integer
-       increments for the same length, and zeros are appended as the length
-       increases.  For the deflate format, these bits are stored backwards
-       from their more natural integer increment ordering, and so when the
-       decoding tables are built in the large loop below, the integer codes
-       are incremented backwards.
-
-       This routine assumes, but does not check, that all of the entries in
-       lens[] are in the range 0..MAXBITS.  The caller must assure this.
-       1..MAXBITS is interpreted as that code length.  zero means that that
-       symbol does not occur in this code.
-
-       The codes are sorted by computing a count of codes for each length,
-       creating from that a table of starting indices for each length in the
-       sorted table, and then entering the symbols in order in the sorted
-       table.  The sorted table is work[], with that space being provided by
-       the caller.
-
-       The length counts are used for other purposes as well, i.e. finding
-       the minimum and maximum length codes, determining if there are any
-       codes at all, checking for a valid set of lengths, and looking ahead
-       at length counts to determine sub-table sizes when building the
-       decoding tables.
-     */
-
-    /* accumulate lengths for codes (assumes lens[] all in 0..MAXBITS) */
-    for (len = 0; len <= MAXBITS; len++)
-        count[len] = 0;
-    for (sym = 0; sym < codes; sym++)
-        count[lens[sym]]++;
-
-    /* bound code lengths, force root to be within code lengths */
-    root = *bits;
-    for (max = MAXBITS; max >= 1; max--)
-        if (count[max] != 0) break;
-    if (root > max) root = max;
-    if (max == 0) {                     /* no symbols to code at all */
-        here.op = (unsigned char)64;    /* invalid code marker */
-        here.bits = (unsigned char)1;
-        here.val = (unsigned short)0;
-        *(*table)++ = here;             /* make a table to force an error */
-        *(*table)++ = here;
-        *bits = 1;
-        return 0;     /* no symbols, but wait for decoding to report error */
-    }
-    for (min = 1; min < max; min++)
-        if (count[min] != 0) break;
-    if (root < min) root = min;
-
-    /* check for an over-subscribed or incomplete set of lengths */
-    left = 1;
-    for (len = 1; len <= MAXBITS; len++) {
-        left <<= 1;
-        left -= count[len];
-        if (left < 0) return -1;        /* over-subscribed */
-    }
-    if (left > 0 && (type == CODES || max != 1))
-        return -1;                      /* incomplete set */
-
-    /* generate offsets into symbol table for each length for sorting */
-    offs[1] = 0;
-    for (len = 1; len < MAXBITS; len++)
-        offs[len + 1] = offs[len] + count[len];
-
-    /* sort symbols by length, by symbol order within each length */
-    for (sym = 0; sym < codes; sym++)
-        if (lens[sym] != 0) work[offs[lens[sym]]++] = (unsigned short)sym;
-
-    /*
-       Create and fill in decoding tables.  In this loop, the table being
-       filled is at next and has curr index bits.  The code being used is huff
-       with length len.  That code is converted to an index by dropping drop
-       bits off of the bottom.  For codes where len is less than drop + curr,
-       those top drop + curr - len bits are incremented through all values to
-       fill the table with replicated entries.
-
-       root is the number of index bits for the root table.  When len exceeds
-       root, sub-tables are created pointed to by the root entry with an index
-       of the low root bits of huff.  This is saved in low to check for when a
-       new sub-table should be started.  drop is zero when the root table is
-       being filled, and drop is root when sub-tables are being filled.
-
-       When a new sub-table is needed, it is necessary to look ahead in the
-       code lengths to determine what size sub-table is needed.  The length
-       counts are used for this, and so count[] is decremented as codes are
-       entered in the tables.
-
-       used keeps track of how many table entries have been allocated from the
-       provided *table space.  It is checked for LENS and DIST tables against
-       the constants ENOUGH_LENS and ENOUGH_DISTS to guard against changes in
-       the initial root table size constants.  See the comments in inftrees.h
-       for more information.
-
-       sym increments through all symbols, and the loop terminates when
-       all codes of length max, i.e. all codes, have been processed.  This
-       routine permits incomplete codes, so another loop after this one fills
-       in the rest of the decoding tables with invalid code markers.
-     */
-
-    /* set up for code type */
-    switch (type) {
-    case CODES:
-        base = extra = work;    /* dummy value--not used */
-        match = 20;
-        break;
-    case LENS:
-        base = lbase;
-        extra = lext;
-        match = 257;
-        break;
-    default:    /* DISTS */
-        base = dbase;
-        extra = dext;
-        match = 0;
-    }
-
-    /* initialize state for loop */
-    huff = 0;                   /* starting code */
-    sym = 0;                    /* starting code symbol */
-    len = min;                  /* starting code length */
-    next = *table;              /* current table to fill in */
-    curr = root;                /* current table index bits */
-    drop = 0;                   /* current bits to drop from code for index */
-    low = (unsigned)(-1);       /* trigger new sub-table when len > root */
-    used = 1U << root;          /* use root table entries */
-    mask = used - 1;            /* mask for comparing low */
-
-    /* check available table space */
-    if ((type == LENS && used > ENOUGH_LENS) ||
-        (type == DISTS && used > ENOUGH_DISTS))
-        return 1;
-
-    /* process all codes and make table entries */
-    for (;;) {
-        /* create table entry */
-        here.bits = (unsigned char)(len - drop);
-        if (work[sym] + 1U < match) {
-            here.op = (unsigned char)0;
-            here.val = work[sym];
-        }
-        else if (work[sym] >= match) {
-            here.op = (unsigned char)(extra[work[sym] - match]);
-            here.val = base[work[sym] - match];
-        }
-        else {
-            here.op = (unsigned char)(32 + 64);         /* end of block */
-            here.val = 0;
-        }
-
-        /* replicate for those indices with low len bits equal to huff */
-        incr = 1U << (len - drop);
-        fill = 1U << curr;
-        min = fill;                 /* save offset to next table */
-        do {
-            fill -= incr;
-            next[(huff >> drop) + fill] = here;
-        } while (fill != 0);
-
-        /* backwards increment the len-bit code huff */
-        incr = 1U << (len - 1);
-        while (huff & incr)
-            incr >>= 1;
-        if (incr != 0) {
-            huff &= incr - 1;
-            huff += incr;
-        }
-        else
-            huff = 0;
-
-        /* go to next symbol, update count, len */
-        sym++;
-        if (--(count[len]) == 0) {
-            if (len == max) break;
-            len = lens[work[sym]];
-        }
-
-        /* create new sub-table if needed */
-        if (len > root && (huff & mask) != low) {
-            /* if first time, transition to sub-tables */
-            if (drop == 0)
-                drop = root;
-
-            /* increment past last table */
-            next += min;            /* here min is 1 << curr */
-
-            /* determine length of next table */
-            curr = len - drop;
-            left = (int)(1 << curr);
-            while (curr + drop < max) {
-                left -= count[curr + drop];
-                if (left <= 0) break;
-                curr++;
-                left <<= 1;
-            }
-
-            /* check for enough space */
-            used += 1U << curr;
-            if ((type == LENS && used > ENOUGH_LENS) ||
-                (type == DISTS && used > ENOUGH_DISTS))
-                return 1;
-
-            /* point entry in root table to sub-table */
-            low = huff & mask;
-            (*table)[low].op = (unsigned char)curr;
-            (*table)[low].bits = (unsigned char)root;
-            (*table)[low].val = (unsigned short)(next - *table);
-        }
-    }
-
-    /* fill in remaining table entry if code is incomplete (guaranteed to have
-       at most one remaining entry, since if the code is incomplete, the
-       maximum code length that was allowed to get this far is one bit) */
-    if (huff != 0) {
-        here.op = (unsigned char)64;            /* invalid code marker */
-        here.bits = (unsigned char)(len - drop);
-        here.val = (unsigned short)0;
-        next[huff] = here;
-    }
-
-    /* set return parameters */
-    *table += used;
-    *bits = root;
-    return 0;
-}
diff --git a/src/png/zlib/inftrees.h b/src/png/zlib/inftrees.h
deleted file mode 100644
index baa53a0b1..000000000
--- a/src/png/zlib/inftrees.h
+++ /dev/null
@@ -1,62 +0,0 @@
-/* inftrees.h -- header to use inftrees.c
- * Copyright (C) 1995-2005, 2010 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* WARNING: this file should *not* be used by applications. It is
-   part of the implementation of the compression library and is
-   subject to change. Applications should only use zlib.h.
- */
-
-/* Structure for decoding tables.  Each entry provides either the
-   information needed to do the operation requested by the code that
-   indexed that table entry, or it provides a pointer to another
-   table that indexes more bits of the code.  op indicates whether
-   the entry is a pointer to another table, a literal, a length or
-   distance, an end-of-block, or an invalid code.  For a table
-   pointer, the low four bits of op is the number of index bits of
-   that table.  For a length or distance, the low four bits of op
-   is the number of extra bits to get after the code.  bits is
-   the number of bits in this code or part of the code to drop off
-   of the bit buffer.  val is the actual byte to output in the case
-   of a literal, the base length or distance, or the offset from
-   the current table to the next table.  Each entry is four bytes. */
-typedef struct {
-    unsigned char op;           /* operation, extra bits, table bits */
-    unsigned char bits;         /* bits in this part of the code */
-    unsigned short val;         /* offset in table or code value */
-} code;
-
-/* op values as set by inflate_table():
-    00000000 - literal
-    0000tttt - table link, tttt != 0 is the number of table index bits
-    0001eeee - length or distance, eeee is the number of extra bits
-    01100000 - end of block
-    01000000 - invalid code
- */
-
-/* Maximum size of the dynamic table.  The maximum number of code structures is
-   1444, which is the sum of 852 for literal/length codes and 592 for distance
-   codes.  These values were found by exhaustive searches using the program
-   examples/enough.c found in the zlib distribtution.  The arguments to that
-   program are the number of symbols, the initial root table size, and the
-   maximum bit length of a code.  "enough 286 9 15" for literal/length codes
-   returns returns 852, and "enough 30 6 15" for distance codes returns 592.
-   The initial root table size (9 or 6) is found in the fifth argument of the
-   inflate_table() calls in inflate.c and infback.c.  If the root table size is
-   changed, then these maximum sizes would be need to be recalculated and
-   updated. */
-#define ENOUGH_LENS 852
-#define ENOUGH_DISTS 592
-#define ENOUGH (ENOUGH_LENS+ENOUGH_DISTS)
-
-/* Type of code to build for inflate_table() */
-typedef enum {
-    CODES,
-    LENS,
-    DISTS
-} codetype;
-
-int ZLIB_INTERNAL inflate_table OF((codetype type, unsigned short FAR *lens,
-                             unsigned codes, code FAR * FAR *table,
-                             unsigned FAR *bits, unsigned short FAR *work));
diff --git a/src/png/zlib/make_vms.com b/src/png/zlib/make_vms.com
deleted file mode 100644
index 65e9d0cbc..000000000
--- a/src/png/zlib/make_vms.com
+++ /dev/null
@@ -1,867 +0,0 @@
-$! make libz under VMS written by
-$! Martin P.J. Zinser
-$!
-$! In case of problems with the install you might contact me at
-$! zinser@zinser.no-ip.info(preferred) or
-$! martin.zinser@eurexchange.com (work)
-$!
-$! Make procedure history for Zlib
-$!
-$!------------------------------------------------------------------------------
-$! Version history
-$! 0.01 20060120 First version to receive a number
-$! 0.02 20061008 Adapt to new Makefile.in
-$! 0.03 20091224 Add support for large file check
-$! 0.04 20100110 Add new gzclose, gzlib, gzread, gzwrite
-$! 0.05 20100221 Exchange zlibdefs.h by zconf.h.in
-$! 0.06 20120111 Fix missing amiss_err, update zconf_h.in, fix new exmples
-$!               subdir path, update module search in makefile.in
-$! 0.07 20120115 Triggered by work done by Alexey Chupahin completly redesigned
-$!               shared image creation
-$! 0.08 20120219 Make it work on VAX again, pre-load missing symbols to shared
-$!               image
-$! 0.09 20120305 SMS.  P1 sets builder ("MMK", "MMS", " " (built-in)).
-$!               "" -> automatic, preference: MMK, MMS, built-in.
-$!
-$ on error then goto err_exit
-$!
-$ true  = 1
-$ false = 0
-$ tmpnam = "temp_" + f$getjpi("","pid")
-$ tt = tmpnam + ".txt"
-$ tc = tmpnam + ".c"
-$ th = tmpnam + ".h"
-$ define/nolog tconfig 'th'
-$ its_decc = false
-$ its_vaxc = false
-$ its_gnuc = false
-$ s_case   = False
-$!
-$! Setup variables holding "config" information
-$!
-$ Make    = "''p1'"
-$ name     = "Zlib"
-$ version  = "?.?.?"
-$ v_string = "ZLIB_VERSION"
-$ v_file   = "zlib.h"
-$ ccopt   = "/include = []"
-$ lopts   = ""
-$ dnsrl   = ""
-$ aconf_in_file = "zconf.h.in#zconf.h_in#zconf_h.in"
-$ conf_check_string = ""
-$ linkonly = false
-$ optfile  = name + ".opt"
-$ mapfile  = name + ".map"
-$ libdefs  = ""
-$ vax      = f$getsyi("HW_MODEL").lt.1024
-$ axp      = f$getsyi("HW_MODEL").ge.1024 .and. f$getsyi("HW_MODEL").lt.4096
-$ ia64     = f$getsyi("HW_MODEL").ge.4096
-$!
-$! 2012-03-05 SMS.
-$! Why is this needed?  And if it is needed, why not simply ".not. vax"?
-$!
-$!!! if axp .or. ia64 then  set proc/parse=extended
-$!
-$ whoami = f$parse(f$environment("Procedure"),,,,"NO_CONCEAL")
-$ mydef  = F$parse(whoami,,,"DEVICE")
-$ mydir  = f$parse(whoami,,,"DIRECTORY") - "]["
-$ myproc = f$parse(whoami,,,"Name") + f$parse(whoami,,,"type")
-$!
-$! Check for MMK/MMS
-$!
-$ if (Make .eqs. "")
-$ then
-$   If F$Search ("Sys$System:MMS.EXE") .nes. "" Then Make = "MMS"
-$   If F$Type (MMK) .eqs. "STRING" Then Make = "MMK"
-$ else
-$   Make = f$edit( Make, "trim")
-$ endif
-$!
-$ gosub find_version
-$!
-$  open/write topt tmp.opt
-$  open/write optf 'optfile'
-$!
-$ gosub check_opts
-$!
-$! Look for the compiler used
-$!
-$ gosub check_compiler
-$ close topt
-$ close optf
-$!
-$ if its_decc
-$ then
-$   ccopt = "/prefix=all" + ccopt
-$   if f$trnlnm("SYS") .eqs. ""
-$   then
-$     if axp
-$     then
-$       define sys sys$library:
-$     else
-$       ccopt = "/decc" + ccopt
-$       define sys decc$library_include:
-$     endif
-$   endif
-$!
-$! 2012-03-05 SMS.
-$! Why /NAMES = AS_IS?  Why not simply ".not. vax"?  And why not on VAX?
-$!
-$   if axp .or. ia64
-$   then
-$       ccopt = ccopt + "/name=as_is/opt=(inline=speed)"
-$       s_case = true
-$   endif
-$ endif
-$ if its_vaxc .or. its_gnuc
-$ then
-$    if f$trnlnm("SYS").eqs."" then define sys sys$library:
-$ endif
-$!
-$! Build a fake configure input header
-$!
-$ open/write conf_hin config.hin
-$ write conf_hin "#undef _LARGEFILE64_SOURCE"
-$ close conf_hin
-$!
-$!
-$ i = 0
-$FIND_ACONF:
-$ fname = f$element(i,"#",aconf_in_file)
-$ if fname .eqs. "#" then goto AMISS_ERR
-$ if f$search(fname) .eqs. ""
-$ then
-$   i = i + 1
-$   goto find_aconf
-$ endif
-$ open/read/err=aconf_err aconf_in 'fname'
-$ open/write aconf zconf.h
-$ACONF_LOOP:
-$ read/end_of_file=aconf_exit aconf_in line
-$ work = f$edit(line, "compress,trim")
-$ if f$extract(0,6,work) .nes. "#undef"
-$ then
-$   if f$extract(0,12,work) .nes. "#cmakedefine"
-$   then
-$       write aconf line
-$   endif
-$ else
-$   cdef = f$element(1," ",work)
-$   gosub check_config
-$ endif
-$ goto aconf_loop
-$ACONF_EXIT:
-$ write aconf ""
-$ write aconf "/* VMS specifics added by make_vms.com: */"
-$ write aconf "#define VMS 1"
-$ write aconf "#include <unistd.h>"
-$ write aconf "#include <unixio.h>"
-$ write aconf "#ifdef _LARGEFILE"
-$ write aconf "# define off64_t __off64_t"
-$ write aconf "# define fopen64 fopen"
-$ write aconf "# define fseeko64 fseeko"
-$ write aconf "# define lseek64 lseek"
-$ write aconf "# define ftello64 ftell"
-$ write aconf "#endif"
-$ write aconf "#if !defined( __VAX) && (__CRTL_VER >= 70312000)"
-$ write aconf "# define HAVE_VSNPRINTF"
-$ write aconf "#endif"
-$ close aconf_in
-$ close aconf
-$ if f$search("''th'") .nes. "" then delete 'th';*
-$! Build the thing plain or with mms
-$!
-$ write sys$output "Compiling Zlib sources ..."
-$ if make.eqs.""
-$ then
-$   if (f$search( "example.obj;*") .nes. "") then delete example.obj;*
-$   if (f$search( "minigzip.obj;*") .nes. "") then delete minigzip.obj;*
-$   CALL MAKE adler32.OBJ "CC ''CCOPT' adler32" -
-                adler32.c zlib.h zconf.h
-$   CALL MAKE compress.OBJ "CC ''CCOPT' compress" -
-                compress.c zlib.h zconf.h
-$   CALL MAKE crc32.OBJ "CC ''CCOPT' crc32" -
-                crc32.c zlib.h zconf.h
-$   CALL MAKE deflate.OBJ "CC ''CCOPT' deflate" -
-                deflate.c deflate.h zutil.h zlib.h zconf.h
-$   CALL MAKE gzclose.OBJ "CC ''CCOPT' gzclose" -
-                gzclose.c zutil.h zlib.h zconf.h
-$   CALL MAKE gzlib.OBJ "CC ''CCOPT' gzlib" -
-                gzlib.c zutil.h zlib.h zconf.h
-$   CALL MAKE gzread.OBJ "CC ''CCOPT' gzread" -
-                gzread.c zutil.h zlib.h zconf.h
-$   CALL MAKE gzwrite.OBJ "CC ''CCOPT' gzwrite" -
-                gzwrite.c zutil.h zlib.h zconf.h
-$   CALL MAKE infback.OBJ "CC ''CCOPT' infback" -
-                infback.c zutil.h inftrees.h inflate.h inffast.h inffixed.h
-$   CALL MAKE inffast.OBJ "CC ''CCOPT' inffast" -
-                inffast.c zutil.h zlib.h zconf.h inffast.h
-$   CALL MAKE inflate.OBJ "CC ''CCOPT' inflate" -
-                inflate.c zutil.h zlib.h zconf.h infblock.h
-$   CALL MAKE inftrees.OBJ "CC ''CCOPT' inftrees" -
-                inftrees.c zutil.h zlib.h zconf.h inftrees.h
-$   CALL MAKE trees.OBJ "CC ''CCOPT' trees" -
-                trees.c deflate.h zutil.h zlib.h zconf.h
-$   CALL MAKE uncompr.OBJ "CC ''CCOPT' uncompr" -
-                uncompr.c zlib.h zconf.h
-$   CALL MAKE zutil.OBJ "CC ''CCOPT' zutil" -
-                zutil.c zutil.h zlib.h zconf.h
-$   write sys$output "Building Zlib ..."
-$   CALL MAKE libz.OLB "lib/crea libz.olb *.obj" *.OBJ
-$   write sys$output "Building example..."
-$   CALL MAKE example.OBJ "CC ''CCOPT' [.test]example" -
-                [.test]example.c zlib.h zconf.h
-$   call make example.exe "LINK example,libz.olb/lib" example.obj libz.olb
-$   write sys$output "Building minigzip..."
-$   CALL MAKE minigzip.OBJ "CC ''CCOPT' [.test]minigzip" -
-              [.test]minigzip.c zlib.h zconf.h
-$   call make minigzip.exe -
-              "LINK minigzip,libz.olb/lib" -
-              minigzip.obj libz.olb
-$ else
-$   gosub crea_mms
-$   write sys$output "Make ''name' ''version' with ''Make' "
-$   'make'
-$ endif
-$!
-$! Create shareable image
-$!
-$ gosub crea_olist
-$ write sys$output "Creating libzshr.exe"
-$ call map_2_shopt 'mapfile' 'optfile'
-$ LINK_'lopts'/SHARE=libzshr.exe modules.opt/opt,'optfile'/opt
-$ write sys$output "Zlib build completed"
-$ delete/nolog tmp.opt;*
-$ exit
-$AMISS_ERR:
-$ write sys$output "No source for config.hin found."
-$ write sys$output "Tried any of ''aconf_in_file'"
-$ goto err_exit
-$CC_ERR:
-$ write sys$output "C compiler required to build ''name'"
-$ goto err_exit
-$ERR_EXIT:
-$ set message/facil/ident/sever/text
-$ close/nolog optf
-$ close/nolog topt
-$ close/nolog aconf_in
-$ close/nolog aconf
-$ close/nolog out
-$ close/nolog min
-$ close/nolog mod
-$ close/nolog h_in
-$ write sys$output "Exiting..."
-$ exit 2
-$!
-$!
-$MAKE: SUBROUTINE   !SUBROUTINE TO CHECK DEPENDENCIES
-$ V = 'F$Verify(0)
-$! P1 = What we are trying to make
-$! P2 = Command to make it
-$! P3 - P8  What it depends on
-$
-$ If F$Search(P1) .Eqs. "" Then Goto Makeit
-$ Time = F$CvTime(F$File(P1,"RDT"))
-$arg=3
-$Loop:
-$       Argument = P'arg
-$       If Argument .Eqs. "" Then Goto Exit
-$       El=0
-$Loop2:
-$       File = F$Element(El," ",Argument)
-$       If File .Eqs. " " Then Goto Endl
-$       AFile = ""
-$Loop3:
-$       OFile = AFile
-$       AFile = F$Search(File)
-$       If AFile .Eqs. "" .Or. AFile .Eqs. OFile Then Goto NextEl
-$       If F$CvTime(F$File(AFile,"RDT")) .Ges. Time Then Goto Makeit
-$       Goto Loop3
-$NextEL:
-$       El = El + 1
-$       Goto Loop2
-$EndL:
-$ arg=arg+1
-$ If arg .Le. 8 Then Goto Loop
-$ Goto Exit
-$
-$Makeit:
-$ VV=F$VERIFY(0)
-$ write sys$output P2
-$ 'P2
-$ VV='F$Verify(VV)
-$Exit:
-$ If V Then Set Verify
-$ENDSUBROUTINE
-$!------------------------------------------------------------------------------
-$!
-$! Check command line options and set symbols accordingly
-$!
-$!------------------------------------------------------------------------------
-$! Version history
-$! 0.01 20041206 First version to receive a number
-$! 0.02 20060126 Add new "HELP" target
-$ CHECK_OPTS:
-$ i = 1
-$ OPT_LOOP:
-$ if i .lt. 9
-$ then
-$   cparm = f$edit(p'i',"upcase")
-$!
-$! Check if parameter actually contains something
-$!
-$   if f$edit(cparm,"trim") .nes. ""
-$   then
-$     if cparm .eqs. "DEBUG"
-$     then
-$       ccopt = ccopt + "/noopt/deb"
-$       lopts = lopts + "/deb"
-$     endif
-$     if f$locate("CCOPT=",cparm) .lt. f$length(cparm)
-$     then
-$       start = f$locate("=",cparm) + 1
-$       len   = f$length(cparm) - start
-$       ccopt = ccopt + f$extract(start,len,cparm)
-$       if f$locate("AS_IS",f$edit(ccopt,"UPCASE")) .lt. f$length(ccopt) -
-          then s_case = true
-$     endif
-$     if cparm .eqs. "LINK" then linkonly = true
-$     if f$locate("LOPTS=",cparm) .lt. f$length(cparm)
-$     then
-$       start = f$locate("=",cparm) + 1
-$       len   = f$length(cparm) - start
-$       lopts = lopts + f$extract(start,len,cparm)
-$     endif
-$     if f$locate("CC=",cparm) .lt. f$length(cparm)
-$     then
-$       start  = f$locate("=",cparm) + 1
-$       len    = f$length(cparm) - start
-$       cc_com = f$extract(start,len,cparm)
-        if (cc_com .nes. "DECC") .and. -
-           (cc_com .nes. "VAXC") .and. -
-           (cc_com .nes. "GNUC")
-$       then
-$         write sys$output "Unsupported compiler choice ''cc_com' ignored"
-$         write sys$output "Use DECC, VAXC, or GNUC instead"
-$       else
-$         if cc_com .eqs. "DECC" then its_decc = true
-$         if cc_com .eqs. "VAXC" then its_vaxc = true
-$         if cc_com .eqs. "GNUC" then its_gnuc = true
-$       endif
-$     endif
-$     if f$locate("MAKE=",cparm) .lt. f$length(cparm)
-$     then
-$       start  = f$locate("=",cparm) + 1
-$       len    = f$length(cparm) - start
-$       mmks = f$extract(start,len,cparm)
-$       if (mmks .eqs. "MMK") .or. (mmks .eqs. "MMS")
-$       then
-$         make = mmks
-$       else
-$         write sys$output "Unsupported make choice ''mmks' ignored"
-$         write sys$output "Use MMK or MMS instead"
-$       endif
-$     endif
-$     if cparm .eqs. "HELP" then gosub bhelp
-$   endif
-$   i = i + 1
-$   goto opt_loop
-$ endif
-$ return
-$!------------------------------------------------------------------------------
-$!
-$! Look for the compiler used
-$!
-$! Version history
-$! 0.01 20040223 First version to receive a number
-$! 0.02 20040229 Save/set value of decc$no_rooted_search_lists
-$! 0.03 20060202 Extend handling of GNU C
-$! 0.04 20090402 Compaq -> hp
-$CHECK_COMPILER:
-$ if (.not. (its_decc .or. its_vaxc .or. its_gnuc))
-$ then
-$   its_decc = (f$search("SYS$SYSTEM:DECC$COMPILER.EXE") .nes. "")
-$   its_vaxc = .not. its_decc .and. (F$Search("SYS$System:VAXC.Exe") .nes. "")
-$   its_gnuc = .not. (its_decc .or. its_vaxc) .and. (f$trnlnm("gnu_cc") .nes. "")
-$ endif
-$!
-$! Exit if no compiler available
-$!
-$ if (.not. (its_decc .or. its_vaxc .or. its_gnuc))
-$ then goto CC_ERR
-$ else
-$   if its_decc
-$   then
-$     write sys$output "CC compiler check ... hp C"
-$     if f$trnlnm("decc$no_rooted_search_lists") .nes. ""
-$     then
-$       dnrsl = f$trnlnm("decc$no_rooted_search_lists")
-$     endif
-$     define/nolog decc$no_rooted_search_lists 1
-$   else
-$     if its_vaxc then write sys$output "CC compiler check ... VAX C"
-$     if its_gnuc
-$     then
-$         write sys$output "CC compiler check ... GNU C"
-$         if f$trnlnm(topt) then write topt "gnu_cc:[000000]gcclib.olb/lib"
-$         if f$trnlnm(optf) then write optf "gnu_cc:[000000]gcclib.olb/lib"
-$         cc = "gcc"
-$     endif
-$     if f$trnlnm(topt) then write topt "sys$share:vaxcrtl.exe/share"
-$     if f$trnlnm(optf) then write optf "sys$share:vaxcrtl.exe/share"
-$   endif
-$ endif
-$ return
-$!------------------------------------------------------------------------------
-$!
-$! If MMS/MMK are available dump out the descrip.mms if required
-$!
-$CREA_MMS:
-$ write sys$output "Creating descrip.mms..."
-$ create descrip.mms
-$ open/append out descrip.mms
-$ copy sys$input: out
-$ deck
-# descrip.mms: MMS description file for building zlib on VMS
-# written by Martin P.J. Zinser
-# <zinser@zinser.no-ip.info or martin.zinser@eurexchange.com>
-
-OBJS = adler32.obj, compress.obj, crc32.obj, gzclose.obj, gzlib.obj\
-       gzread.obj, gzwrite.obj, uncompr.obj, infback.obj\
-       deflate.obj, trees.obj, zutil.obj, inflate.obj, \
-       inftrees.obj, inffast.obj
-
-$ eod
-$ write out "CFLAGS=", ccopt
-$ write out "LOPTS=", lopts
-$ write out "all : example.exe minigzip.exe libz.olb"
-$ copy sys$input: out
-$ deck
-        @ write sys$output " Example applications available"
-
-libz.olb : libz.olb($(OBJS))
-	@ write sys$output " libz available"
-
-example.exe : example.obj libz.olb
-              link $(LOPTS) example,libz.olb/lib
-
-minigzip.exe : minigzip.obj libz.olb
-              link $(LOPTS) minigzip,libz.olb/lib
-
-clean :
-	delete *.obj;*,libz.olb;*,*.opt;*,*.exe;*
-
-
-# Other dependencies.
-adler32.obj  : adler32.c zutil.h zlib.h zconf.h
-compress.obj : compress.c zlib.h zconf.h
-crc32.obj    : crc32.c zutil.h zlib.h zconf.h
-deflate.obj  : deflate.c deflate.h zutil.h zlib.h zconf.h
-example.obj  : [.test]example.c zlib.h zconf.h
-gzclose.obj  : gzclose.c zutil.h zlib.h zconf.h
-gzlib.obj    : gzlib.c zutil.h zlib.h zconf.h
-gzread.obj   : gzread.c zutil.h zlib.h zconf.h
-gzwrite.obj  : gzwrite.c zutil.h zlib.h zconf.h
-inffast.obj  : inffast.c zutil.h zlib.h zconf.h inftrees.h inffast.h
-inflate.obj  : inflate.c zutil.h zlib.h zconf.h
-inftrees.obj : inftrees.c zutil.h zlib.h zconf.h inftrees.h
-minigzip.obj : [.test]minigzip.c zlib.h zconf.h
-trees.obj    : trees.c deflate.h zutil.h zlib.h zconf.h
-uncompr.obj  : uncompr.c zlib.h zconf.h
-zutil.obj    : zutil.c zutil.h zlib.h zconf.h
-infback.obj  : infback.c zutil.h inftrees.h inflate.h inffast.h inffixed.h
-$ eod
-$ close out
-$ return
-$!------------------------------------------------------------------------------
-$!
-$! Read list of core library sources from makefile.in and create options
-$! needed to build shareable image
-$!
-$CREA_OLIST:
-$ open/read min makefile.in
-$ open/write mod modules.opt
-$ src_check_list = "OBJZ =#OBJG ="
-$MRLOOP:
-$ read/end=mrdone min rec
-$ i = 0
-$SRC_CHECK_LOOP:
-$ src_check = f$element(i, "#", src_check_list)
-$ i = i+1
-$ if src_check .eqs. "#" then goto mrloop
-$ if (f$extract(0,6,rec) .nes. src_check) then goto src_check_loop
-$ rec = rec - src_check
-$ gosub extra_filnam
-$ if (f$element(1,"\",rec) .eqs. "\") then goto mrloop
-$MRSLOOP:
-$ read/end=mrdone min rec
-$ gosub extra_filnam
-$ if (f$element(1,"\",rec) .nes. "\") then goto mrsloop
-$MRDONE:
-$ close min
-$ close mod
-$ return
-$!------------------------------------------------------------------------------
-$!
-$! Take record extracted in crea_olist and split it into single filenames
-$!
-$EXTRA_FILNAM:
-$ myrec = f$edit(rec - "\", "trim,compress")
-$ i = 0
-$FELOOP:
-$ srcfil = f$element(i," ", myrec)
-$ if (srcfil .nes. " ")
-$ then
-$   write mod f$parse(srcfil,,,"NAME"), ".obj"
-$   i = i + 1
-$   goto feloop
-$ endif
-$ return
-$!------------------------------------------------------------------------------
-$!
-$! Find current Zlib version number
-$!
-$FIND_VERSION:
-$ open/read h_in 'v_file'
-$hloop:
-$ read/end=hdone h_in rec
-$ rec = f$edit(rec,"TRIM")
-$ if (f$extract(0,1,rec) .nes. "#") then goto hloop
-$ rec = f$edit(rec - "#", "TRIM")
-$ if f$element(0," ",rec) .nes. "define" then goto hloop
-$ if f$element(1," ",rec) .eqs. v_string
-$ then
-$   version = 'f$element(2," ",rec)'
-$   goto hdone
-$ endif
-$ goto hloop
-$hdone:
-$ close h_in
-$ return
-$!------------------------------------------------------------------------------
-$!
-$CHECK_CONFIG:
-$!
-$ in_ldef = f$locate(cdef,libdefs)
-$ if (in_ldef .lt. f$length(libdefs))
-$ then
-$   write aconf "#define ''cdef' 1"
-$   libdefs = f$extract(0,in_ldef,libdefs) + -
-              f$extract(in_ldef + f$length(cdef) + 1, -
-                        f$length(libdefs) - in_ldef - f$length(cdef) - 1, -
-                        libdefs)
-$ else
-$   if (f$type('cdef') .eqs. "INTEGER")
-$   then
-$     write aconf "#define ''cdef' ", 'cdef'
-$   else
-$     if (f$type('cdef') .eqs. "STRING")
-$     then
-$       write aconf "#define ''cdef' ", """", '''cdef'', """"
-$     else
-$       gosub check_cc_def
-$     endif
-$   endif
-$ endif
-$ return
-$!------------------------------------------------------------------------------
-$!
-$! Check if this is a define relating to the properties of the C/C++
-$! compiler
-$!
-$ CHECK_CC_DEF:
-$ if (cdef .eqs. "_LARGEFILE64_SOURCE")
-$ then
-$   copy sys$input: 'tc'
-$   deck
-#include "tconfig"
-#define _LARGEFILE
-#include <stdio.h>
-
-int main(){
-FILE *fp;
-  fp = fopen("temp.txt","r");
-  fseeko(fp,1,SEEK_SET);
-  fclose(fp);
-}
-
-$   eod
-$   test_inv = false
-$   comm_h = false
-$   gosub cc_prop_check
-$   return
-$ endif
-$ write aconf "/* ", line, " */"
-$ return
-$!------------------------------------------------------------------------------
-$!
-$! Check for properties of C/C++ compiler
-$!
-$! Version history
-$! 0.01 20031020 First version to receive a number
-$! 0.02 20031022 Added logic for defines with value
-$! 0.03 20040309 Make sure local config file gets not deleted
-$! 0.04 20041230 Also write include for configure run
-$! 0.05 20050103 Add processing of "comment defines"
-$CC_PROP_CHECK:
-$ cc_prop = true
-$ is_need = false
-$ is_need = (f$extract(0,4,cdef) .eqs. "NEED") .or. (test_inv .eq. true)
-$ if f$search(th) .eqs. "" then create 'th'
-$ set message/nofac/noident/nosever/notext
-$ on error then continue
-$ cc 'tmpnam'
-$ if .not. ($status)  then cc_prop = false
-$ on error then continue
-$! The headers might lie about the capabilities of the RTL
-$ link 'tmpnam',tmp.opt/opt
-$ if .not. ($status)  then cc_prop = false
-$ set message/fac/ident/sever/text
-$ on error then goto err_exit
-$ delete/nolog 'tmpnam'.*;*/exclude='th'
-$ if (cc_prop .and. .not. is_need) .or. -
-     (.not. cc_prop .and. is_need)
-$ then
-$   write sys$output "Checking for ''cdef'... yes"
-$   if f$type('cdef_val'_yes) .nes. ""
-$   then
-$     if f$type('cdef_val'_yes) .eqs. "INTEGER" -
-         then call write_config f$fao("#define !AS !UL",cdef,'cdef_val'_yes)
-$     if f$type('cdef_val'_yes) .eqs. "STRING" -
-         then call write_config f$fao("#define !AS !AS",cdef,'cdef_val'_yes)
-$   else
-$     call write_config f$fao("#define !AS 1",cdef)
-$   endif
-$   if (cdef .eqs. "HAVE_FSEEKO") .or. (cdef .eqs. "_LARGE_FILES") .or. -
-       (cdef .eqs. "_LARGEFILE64_SOURCE") then -
-      call write_config f$string("#define _LARGEFILE 1")
-$ else
-$   write sys$output "Checking for ''cdef'... no"
-$   if (comm_h)
-$   then
-      call write_config f$fao("/* !AS */",line)
-$   else
-$     if f$type('cdef_val'_no) .nes. ""
-$     then
-$       if f$type('cdef_val'_no) .eqs. "INTEGER" -
-           then call write_config f$fao("#define !AS !UL",cdef,'cdef_val'_no)
-$       if f$type('cdef_val'_no) .eqs. "STRING" -
-           then call write_config f$fao("#define !AS !AS",cdef,'cdef_val'_no)
-$     else
-$       call write_config f$fao("#undef !AS",cdef)
-$     endif
-$   endif
-$ endif
-$ return
-$!------------------------------------------------------------------------------
-$!
-$! Check for properties of C/C++ compiler with multiple result values
-$!
-$! Version history
-$! 0.01 20040127 First version
-$! 0.02 20050103 Reconcile changes from cc_prop up to version 0.05
-$CC_MPROP_CHECK:
-$ cc_prop = true
-$ i    = 1
-$ idel = 1
-$ MT_LOOP:
-$ if f$type(result_'i') .eqs. "STRING"
-$ then
-$   set message/nofac/noident/nosever/notext
-$   on error then continue
-$   cc 'tmpnam'_'i'
-$   if .not. ($status)  then cc_prop = false
-$   on error then continue
-$! The headers might lie about the capabilities of the RTL
-$   link 'tmpnam'_'i',tmp.opt/opt
-$   if .not. ($status)  then cc_prop = false
-$   set message/fac/ident/sever/text
-$   on error then goto err_exit
-$   delete/nolog 'tmpnam'_'i'.*;*
-$   if (cc_prop)
-$   then
-$     write sys$output "Checking for ''cdef'... ", mdef_'i'
-$     if f$type(mdef_'i') .eqs. "INTEGER" -
-         then call write_config f$fao("#define !AS !UL",cdef,mdef_'i')
-$     if f$type('cdef_val'_yes) .eqs. "STRING" -
-         then call write_config f$fao("#define !AS !AS",cdef,mdef_'i')
-$     goto msym_clean
-$   else
-$     i = i + 1
-$     goto mt_loop
-$   endif
-$ endif
-$ write sys$output "Checking for ''cdef'... no"
-$ call write_config f$fao("#undef !AS",cdef)
-$ MSYM_CLEAN:
-$ if (idel .le. msym_max)
-$ then
-$   delete/sym mdef_'idel'
-$   idel = idel + 1
-$   goto msym_clean
-$ endif
-$ return
-$!------------------------------------------------------------------------------
-$!
-$! Write configuration to both permanent and temporary config file
-$!
-$! Version history
-$! 0.01 20031029 First version to receive a number
-$!
-$WRITE_CONFIG: SUBROUTINE
-$  write aconf 'p1'
-$  open/append confh 'th'
-$  write confh 'p1'
-$  close confh
-$ENDSUBROUTINE
-$!------------------------------------------------------------------------------
-$!
-$! Analyze the project map file and create the symbol vector for a shareable
-$! image from it
-$!
-$! Version history
-$! 0.01 20120128 First version
-$! 0.02 20120226 Add pre-load logic
-$!
-$ MAP_2_SHOPT: Subroutine
-$!
-$ SAY := "WRITE_ SYS$OUTPUT"
-$!
-$ IF F$SEARCH("''P1'") .EQS. ""
-$ THEN
-$    SAY "MAP_2_SHOPT-E-NOSUCHFILE:  Error, inputfile ''p1' not available"
-$    goto exit_m2s
-$ ENDIF
-$ IF "''P2'" .EQS. ""
-$ THEN
-$    SAY "MAP_2_SHOPT:  Error, no output file provided"
-$    goto exit_m2s
-$ ENDIF
-$!
-$ module1 = "deflate#deflateEnd#deflateInit_#deflateParams#deflateSetDictionary"
-$ module2 = "gzclose#gzerror#gzgetc#gzgets#gzopen#gzprintf#gzputc#gzputs#gzread"
-$ module3 = "gzseek#gztell#inflate#inflateEnd#inflateInit_#inflateSetDictionary"
-$ module4 = "inflateSync#uncompress#zlibVersion#compress"
-$ open/read map 'p1
-$ if axp .or. ia64
-$ then
-$     open/write aopt a.opt
-$     open/write bopt b.opt
-$     write aopt " CASE_SENSITIVE=YES"
-$     write bopt "SYMBOL_VECTOR= (-"
-$     mod_sym_num = 1
-$ MOD_SYM_LOOP:
-$     if f$type(module'mod_sym_num') .nes. ""
-$     then
-$         mod_in = 0
-$ MOD_SYM_IN:
-$         shared_proc = f$element(mod_in, "#", module'mod_sym_num')
-$         if shared_proc .nes. "#"
-$         then
-$             write aopt f$fao(" symbol_vector=(!AS/!AS=PROCEDURE)",-
-        		       f$edit(shared_proc,"upcase"),shared_proc)
-$             write bopt f$fao("!AS=PROCEDURE,-",shared_proc)
-$             mod_in = mod_in + 1
-$             goto mod_sym_in
-$         endif
-$         mod_sym_num = mod_sym_num + 1
-$         goto mod_sym_loop
-$     endif
-$MAP_LOOP:
-$     read/end=map_end map line
-$     if (f$locate("{",line).lt. f$length(line)) .or. -
-         (f$locate("global:", line) .lt. f$length(line))
-$     then
-$         proc = true
-$         goto map_loop
-$     endif
-$     if f$locate("}",line).lt. f$length(line) then proc = false
-$     if f$locate("local:", line) .lt. f$length(line) then proc = false
-$     if proc
-$     then
-$         shared_proc = f$edit(line,"collapse")
-$         chop_semi = f$locate(";", shared_proc)
-$         if chop_semi .lt. f$length(shared_proc) then -
-              shared_proc = f$extract(0, chop_semi, shared_proc)
-$         write aopt f$fao(" symbol_vector=(!AS/!AS=PROCEDURE)",-
-        			 f$edit(shared_proc,"upcase"),shared_proc)
-$         write bopt f$fao("!AS=PROCEDURE,-",shared_proc)
-$     endif
-$     goto map_loop
-$MAP_END:
-$     close/nolog aopt
-$     close/nolog bopt
-$     open/append libopt 'p2'
-$     open/read aopt a.opt
-$     open/read bopt b.opt
-$ALOOP:
-$     read/end=aloop_end aopt line
-$     write libopt line
-$     goto aloop
-$ALOOP_END:
-$     close/nolog aopt
-$     sv = ""
-$BLOOP:
-$     read/end=bloop_end bopt svn
-$     if (svn.nes."")
-$     then
-$        if (sv.nes."") then write libopt sv
-$        sv = svn
-$     endif
-$     goto bloop
-$BLOOP_END:
-$     write libopt f$extract(0,f$length(sv)-2,sv), "-"
-$     write libopt ")"
-$     close/nolog bopt
-$     delete/nolog/noconf a.opt;*,b.opt;*
-$ else
-$     if vax
-$     then
-$     open/append libopt 'p2'
-$     mod_sym_num = 1
-$ VMOD_SYM_LOOP:
-$     if f$type(module'mod_sym_num') .nes. ""
-$     then
-$         mod_in = 0
-$ VMOD_SYM_IN:
-$         shared_proc = f$element(mod_in, "#", module'mod_sym_num')
-$         if shared_proc .nes. "#"
-$         then
-$     	      write libopt f$fao("UNIVERSAL=!AS",-
-      	  			     f$edit(shared_proc,"upcase"))
-$             mod_in = mod_in + 1
-$             goto vmod_sym_in
-$         endif
-$         mod_sym_num = mod_sym_num + 1
-$         goto vmod_sym_loop
-$     endif
-$VMAP_LOOP:
-$     	  read/end=vmap_end map line
-$     	  if (f$locate("{",line).lt. f$length(line)) .or. -
-   	      (f$locate("global:", line) .lt. f$length(line))
-$     	  then
-$     	      proc = true
-$     	      goto vmap_loop
-$     	  endif
-$     	  if f$locate("}",line).lt. f$length(line) then proc = false
-$     	  if f$locate("local:", line) .lt. f$length(line) then proc = false
-$     	  if proc
-$     	  then
-$     	      shared_proc = f$edit(line,"collapse")
-$     	      chop_semi = f$locate(";", shared_proc)
-$     	      if chop_semi .lt. f$length(shared_proc) then -
-      	  	  shared_proc = f$extract(0, chop_semi, shared_proc)
-$     	      write libopt f$fao("UNIVERSAL=!AS",-
-      	  			     f$edit(shared_proc,"upcase"))
-$     	  endif
-$     	  goto vmap_loop
-$VMAP_END:
-$     else
-$         write sys$output "Unknown Architecture (Not VAX, AXP, or IA64)"
-$         write sys$output "No options file created"
-$     endif
-$ endif
-$ EXIT_M2S:
-$ close/nolog map
-$ close/nolog libopt
-$ endsubroutine
diff --git a/src/png/zlib/msdos/Makefile.bor b/src/png/zlib/msdos/Makefile.bor
deleted file mode 100644
index 3d12a2c25..000000000
--- a/src/png/zlib/msdos/Makefile.bor
+++ /dev/null
@@ -1,115 +0,0 @@
-# Makefile for zlib
-# Borland C++
-# Last updated: 15-Mar-2003
-
-# To use, do "make -fmakefile.bor"
-# To compile in small model, set below: MODEL=s
-
-# WARNING: the small model is supported but only for small values of
-# MAX_WBITS and MAX_MEM_LEVEL. For example:
-#    -DMAX_WBITS=11 -DDEF_WBITS=11 -DMAX_MEM_LEVEL=3
-# If you wish to reduce the memory requirements (default 256K for big
-# objects plus a few K), you can add to the LOC macro below:
-#   -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
-# See zconf.h for details about the memory requirements.
-
-# ------------ Turbo C++, Borland C++ ------------
-
-#    Optional nonstandard preprocessor flags (e.g. -DMAX_MEM_LEVEL=7)
-#    should be added to the environment via "set LOCAL_ZLIB=-DFOO" or added
-#    to the declaration of LOC here:
-LOC = $(LOCAL_ZLIB)
-
-# type for CPU required: 0: 8086, 1: 80186, 2: 80286, 3: 80386, etc.
-CPU_TYP = 0
-
-# memory model: one of s, m, c, l (small, medium, compact, large)
-MODEL=l
-
-# replace bcc with tcc for Turbo C++ 1.0, with bcc32 for the 32 bit version
-CC=bcc
-LD=bcc
-AR=tlib
-
-# compiler flags
-# replace "-O2" by "-O -G -a -d" for Turbo C++ 1.0
-CFLAGS=-O2 -Z -m$(MODEL) $(LOC)
-
-LDFLAGS=-m$(MODEL) -f-
-
-
-# variables
-ZLIB_LIB = zlib_$(MODEL).lib
-
-OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj
-OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj
-OBJP1 = +adler32.obj+compress.obj+crc32.obj+deflate.obj+gzclose.obj+gzlib.obj+gzread.obj
-OBJP2 = +gzwrite.obj+infback.obj+inffast.obj+inflate.obj+inftrees.obj+trees.obj+uncompr.obj+zutil.obj
-
-
-# targets
-all: $(ZLIB_LIB) example.exe minigzip.exe
-
-.c.obj:
-	$(CC) -c $(CFLAGS) $*.c
-
-adler32.obj: adler32.c zlib.h zconf.h
-
-compress.obj: compress.c zlib.h zconf.h
-
-crc32.obj: crc32.c zlib.h zconf.h crc32.h
-
-deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
-
-gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h
-
-gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h
-
-gzread.obj: gzread.c zlib.h zconf.h gzguts.h
-
-gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h
-
-infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h inffixed.h
-
-inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h
-
-inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h inffixed.h
-
-inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
-
-trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h
-
-uncompr.obj: uncompr.c zlib.h zconf.h
-
-zutil.obj: zutil.c zutil.h zlib.h zconf.h
-
-example.obj: test/example.c zlib.h zconf.h
-
-minigzip.obj: test/minigzip.c zlib.h zconf.h
-
-
-# the command line is cut to fit in the MS-DOS 128 byte limit:
-$(ZLIB_LIB): $(OBJ1) $(OBJ2)
-	-del $(ZLIB_LIB)
-	$(AR) $(ZLIB_LIB) $(OBJP1)
-	$(AR) $(ZLIB_LIB) $(OBJP2)
-
-example.exe: example.obj $(ZLIB_LIB)
-	$(LD) $(LDFLAGS) example.obj $(ZLIB_LIB)
-
-minigzip.exe: minigzip.obj $(ZLIB_LIB)
-	$(LD) $(LDFLAGS) minigzip.obj $(ZLIB_LIB)
-
-test: example.exe minigzip.exe
-	example
-	echo hello world | minigzip | minigzip -d
-
-clean:
-	-del *.obj
-	-del *.lib
-	-del *.exe
-	-del zlib_*.bak
-	-del foo.gz
diff --git a/src/png/zlib/msdos/Makefile.dj2 b/src/png/zlib/msdos/Makefile.dj2
deleted file mode 100644
index 59d2037d6..000000000
--- a/src/png/zlib/msdos/Makefile.dj2
+++ /dev/null
@@ -1,104 +0,0 @@
-# Makefile for zlib.  Modified for djgpp v2.0 by F. J. Donahoe, 3/15/96.
-# Copyright (C) 1995-1998 Jean-loup Gailly.
-# For conditions of distribution and use, see copyright notice in zlib.h
-
-# To compile, or to compile and test, type:
-#
-#   make -fmakefile.dj2;  make test -fmakefile.dj2
-#
-# To install libz.a, zconf.h and zlib.h in the djgpp directories, type:
-#
-#    make install -fmakefile.dj2
-#
-# after first defining LIBRARY_PATH and INCLUDE_PATH in djgpp.env as
-# in the sample below if the pattern of the DJGPP distribution is to
-# be followed.  Remember that, while <sp>'es around <=> are ignored in
-# makefiles, they are *not* in batch files or in djgpp.env.
-# - - - - -
-# [make]
-# INCLUDE_PATH=%\>;INCLUDE_PATH%%\DJDIR%\include
-# LIBRARY_PATH=%\>;LIBRARY_PATH%%\DJDIR%\lib
-# BUTT=-m486
-# - - - - -
-# Alternately, these variables may be defined below, overriding the values
-# in djgpp.env, as
-# INCLUDE_PATH=c:\usr\include
-# LIBRARY_PATH=c:\usr\lib
-
-CC=gcc
-
-#CFLAGS=-MMD -O
-#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS=-MMD -g -DZLIB_DEBUG
-CFLAGS=-MMD -O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
-             -Wstrict-prototypes -Wmissing-prototypes
-
-# If cp.exe is available, replace "copy /Y" with "cp -fp" .
-CP=copy /Y
-# If gnu install.exe is available, replace $(CP) with ginstall.
-INSTALL=$(CP)
-# The default value of RM is "rm -f."  If "rm.exe" is found, comment out:
-RM=del
-LDLIBS=-L. -lz
-LD=$(CC) -s -o
-LDSHARED=$(CC)
-
-INCL=zlib.h zconf.h
-LIBS=libz.a
-
-AR=ar rcs
-
-prefix=/usr/local
-exec_prefix = $(prefix)
-
-OBJS = adler32.o compress.o crc32.o gzclose.o gzlib.o gzread.o gzwrite.o \
-       uncompr.o deflate.o trees.o zutil.o inflate.o infback.o inftrees.o inffast.o
-
-OBJA =
-# to use the asm code: make OBJA=match.o
-
-TEST_OBJS = example.o minigzip.o
-
-all: example.exe minigzip.exe
-
-check: test
-test: all
-	./example
-	echo hello world | .\minigzip | .\minigzip -d
-
-%.o : %.c
-	$(CC) $(CFLAGS) -c $< -o $@
-
-libz.a: $(OBJS) $(OBJA)
-	$(AR) $@ $(OBJS) $(OBJA)
-
-%.exe : %.o $(LIBS)
-	$(LD) $@ $< $(LDLIBS)
-
-# INCLUDE_PATH and LIBRARY_PATH were set for [make] in djgpp.env .
-
-.PHONY : uninstall clean
-
-install: $(INCL) $(LIBS)
-	-@if not exist $(INCLUDE_PATH)\nul mkdir $(INCLUDE_PATH)
-	-@if not exist $(LIBRARY_PATH)\nul mkdir $(LIBRARY_PATH)
-	$(INSTALL) zlib.h $(INCLUDE_PATH)
-	$(INSTALL) zconf.h $(INCLUDE_PATH)
-	$(INSTALL) libz.a $(LIBRARY_PATH)
-
-uninstall:
-	$(RM) $(INCLUDE_PATH)\zlib.h
-	$(RM) $(INCLUDE_PATH)\zconf.h
-	$(RM) $(LIBRARY_PATH)\libz.a
-
-clean:
-	$(RM) *.d
-	$(RM) *.o
-	$(RM) *.exe
-	$(RM) libz.a
-	$(RM) foo.gz
-
-DEPS := $(wildcard *.d)
-ifneq ($(DEPS),)
-include $(DEPS)
-endif
diff --git a/src/png/zlib/msdos/Makefile.emx b/src/png/zlib/msdos/Makefile.emx
deleted file mode 100644
index e30f67bed..000000000
--- a/src/png/zlib/msdos/Makefile.emx
+++ /dev/null
@@ -1,69 +0,0 @@
-# Makefile for zlib.  Modified for emx 0.9c by Chr. Spieler, 6/17/98.
-# Copyright (C) 1995-1998 Jean-loup Gailly.
-# For conditions of distribution and use, see copyright notice in zlib.h
-
-# To compile, or to compile and test, type:
-#
-#   make -fmakefile.emx;  make test -fmakefile.emx
-#
-
-CC=gcc
-
-#CFLAGS=-MMD -O
-#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS=-MMD -g -DZLIB_DEBUG
-CFLAGS=-MMD -O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
-             -Wstrict-prototypes -Wmissing-prototypes
-
-# If cp.exe is available, replace "copy /Y" with "cp -fp" .
-CP=copy /Y
-# If gnu install.exe is available, replace $(CP) with ginstall.
-INSTALL=$(CP)
-# The default value of RM is "rm -f."  If "rm.exe" is found, comment out:
-RM=del
-LDLIBS=-L. -lzlib
-LD=$(CC) -s -o
-LDSHARED=$(CC)
-
-INCL=zlib.h zconf.h
-LIBS=zlib.a
-
-AR=ar rcs
-
-prefix=/usr/local
-exec_prefix = $(prefix)
-
-OBJS = adler32.o compress.o crc32.o gzclose.o gzlib.o gzread.o gzwrite.o \
-       uncompr.o deflate.o trees.o zutil.o inflate.o infback.o inftrees.o inffast.o
-
-TEST_OBJS = example.o minigzip.o
-
-all: example.exe minigzip.exe
-
-test: all
-	./example
-	echo hello world | .\minigzip | .\minigzip -d
-
-%.o : %.c
-	$(CC) $(CFLAGS) -c $< -o $@
-
-zlib.a: $(OBJS)
-	$(AR) $@ $(OBJS)
-
-%.exe : %.o $(LIBS)
-	$(LD) $@ $< $(LDLIBS)
-
-
-.PHONY : clean
-
-clean:
-	$(RM) *.d
-	$(RM) *.o
-	$(RM) *.exe
-	$(RM) zlib.a
-	$(RM) foo.gz
-
-DEPS := $(wildcard *.d)
-ifneq ($(DEPS),)
-include $(DEPS)
-endif
diff --git a/src/png/zlib/msdos/Makefile.msc b/src/png/zlib/msdos/Makefile.msc
deleted file mode 100644
index ae8378615..000000000
--- a/src/png/zlib/msdos/Makefile.msc
+++ /dev/null
@@ -1,112 +0,0 @@
-# Makefile for zlib
-# Microsoft C 5.1 or later
-# Last updated: 19-Mar-2003
-
-# To use, do "make makefile.msc"
-# To compile in small model, set below: MODEL=S
-
-# If you wish to reduce the memory requirements (default 256K for big
-# objects plus a few K), you can add to the LOC macro below:
-#   -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
-# See zconf.h for details about the memory requirements.
-
-# ------------- Microsoft C 5.1 and later -------------
-
-#    Optional nonstandard preprocessor flags (e.g. -DMAX_MEM_LEVEL=7)
-#    should be added to the environment via "set LOCAL_ZLIB=-DFOO" or added
-#    to the declaration of LOC here:
-LOC = $(LOCAL_ZLIB)
-
-# Type for CPU required: 0: 8086, 1: 80186, 2: 80286, 3: 80386, etc.
-CPU_TYP = 0
-
-# Memory model: one of S, M, C, L (small, medium, compact, large)
-MODEL=L
-
-CC=cl
-CFLAGS=-nologo -A$(MODEL) -G$(CPU_TYP) -W3 -Oait -Gs $(LOC)
-#-Ox generates bad code with MSC 5.1
-LIB_CFLAGS=-Zl $(CFLAGS)
-
-LD=link
-LDFLAGS=/noi/e/st:0x1500/noe/farcall/packcode
-# "/farcall/packcode" are only useful for `large code' memory models
-# but should be a "no-op" for small code models.
-
-
-# variables
-ZLIB_LIB = zlib_$(MODEL).lib
-
-OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj
-OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj
-
-
-# targets
-all:  $(ZLIB_LIB) example.exe minigzip.exe
-
-.c.obj:
-	$(CC) -c $(LIB_CFLAGS) $*.c
-
-adler32.obj: adler32.c zlib.h zconf.h
-
-compress.obj: compress.c zlib.h zconf.h
-
-crc32.obj: crc32.c zlib.h zconf.h crc32.h
-
-deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
-
-gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h
-
-gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h
-
-gzread.obj: gzread.c zlib.h zconf.h gzguts.h
-
-gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h
-
-infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h inffixed.h
-
-inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h
-
-inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h inffixed.h
-
-inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
-
-trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h
-
-uncompr.obj: uncompr.c zlib.h zconf.h
-
-zutil.obj: zutil.c zutil.h zlib.h zconf.h
-
-example.obj: test/example.c zlib.h zconf.h
-	$(CC) -c $(CFLAGS) $*.c
-
-minigzip.obj: test/minigzip.c zlib.h zconf.h
-	$(CC) -c $(CFLAGS) $*.c
-
-
-# the command line is cut to fit in the MS-DOS 128 byte limit:
-$(ZLIB_LIB): $(OBJ1) $(OBJ2)
-	if exist $(ZLIB_LIB) del $(ZLIB_LIB)
-	lib $(ZLIB_LIB) $(OBJ1);
-	lib $(ZLIB_LIB) $(OBJ2);
-
-example.exe: example.obj $(ZLIB_LIB)
-	$(LD) $(LDFLAGS) example.obj,,,$(ZLIB_LIB);
-
-minigzip.exe: minigzip.obj $(ZLIB_LIB)
-	$(LD) $(LDFLAGS) minigzip.obj,,,$(ZLIB_LIB);
-
-test: example.exe minigzip.exe
-	example
-	echo hello world | minigzip | minigzip -d
-
-clean:
-	-del *.obj
-	-del *.lib
-	-del *.exe
-	-del *.map
-	-del zlib_*.bak
-	-del foo.gz
diff --git a/src/png/zlib/msdos/Makefile.tc b/src/png/zlib/msdos/Makefile.tc
deleted file mode 100644
index 5aec82a9d..000000000
--- a/src/png/zlib/msdos/Makefile.tc
+++ /dev/null
@@ -1,100 +0,0 @@
-# Makefile for zlib
-# Turbo C 2.01, Turbo C++ 1.01
-# Last updated: 15-Mar-2003
-
-# To use, do "make -fmakefile.tc"
-# To compile in small model, set below: MODEL=s
-
-# WARNING: the small model is supported but only for small values of
-# MAX_WBITS and MAX_MEM_LEVEL. For example:
-#    -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
-# If you wish to reduce the memory requirements (default 256K for big
-# objects plus a few K), you can add to CFLAGS below:
-#   -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
-# See zconf.h for details about the memory requirements.
-
-# ------------ Turbo C 2.01, Turbo C++ 1.01 ------------
-MODEL=l
-CC=tcc
-LD=tcc
-AR=tlib
-# CFLAGS=-O2 -G -Z -m$(MODEL) -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
-CFLAGS=-O2 -G -Z -m$(MODEL)
-LDFLAGS=-m$(MODEL) -f-
-
-
-# variables
-ZLIB_LIB = zlib_$(MODEL).lib
-
-OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj
-OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj
-OBJP1 = +adler32.obj+compress.obj+crc32.obj+deflate.obj+gzclose.obj+gzlib.obj+gzread.obj
-OBJP2 = +gzwrite.obj+infback.obj+inffast.obj+inflate.obj+inftrees.obj+trees.obj+uncompr.obj+zutil.obj
-
-
-# targets
-all: $(ZLIB_LIB) example.exe minigzip.exe
-
-.c.obj:
-	$(CC) -c $(CFLAGS) $*.c
-
-adler32.obj: adler32.c zlib.h zconf.h
-
-compress.obj: compress.c zlib.h zconf.h
-
-crc32.obj: crc32.c zlib.h zconf.h crc32.h
-
-deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
-
-gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h
-
-gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h
-
-gzread.obj: gzread.c zlib.h zconf.h gzguts.h
-
-gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h
-
-infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h inffixed.h
-
-inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h
-
-inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h inffixed.h
-
-inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
-
-trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h
-
-uncompr.obj: uncompr.c zlib.h zconf.h
-
-zutil.obj: zutil.c zutil.h zlib.h zconf.h
-
-example.obj: test/example.c zlib.h zconf.h
-
-minigzip.obj: test/minigzip.c zlib.h zconf.h
-
-
-# the command line is cut to fit in the MS-DOS 128 byte limit:
-$(ZLIB_LIB): $(OBJ1) $(OBJ2)
-	-del $(ZLIB_LIB)
-	$(AR) $(ZLIB_LIB) $(OBJP1)
-	$(AR) $(ZLIB_LIB) $(OBJP2)
-
-example.exe: example.obj $(ZLIB_LIB)
-	$(LD) $(LDFLAGS) example.obj $(ZLIB_LIB)
-
-minigzip.exe: minigzip.obj $(ZLIB_LIB)
-	$(LD) $(LDFLAGS) minigzip.obj $(ZLIB_LIB)
-
-test: example.exe minigzip.exe
-	example
-	echo hello world | minigzip | minigzip -d
-
-clean:
-	-del *.obj
-	-del *.lib
-	-del *.exe
-	-del zlib_*.bak
-	-del foo.gz
diff --git a/src/png/zlib/nintendods/Makefile b/src/png/zlib/nintendods/Makefile
deleted file mode 100644
index 21337d01a..000000000
--- a/src/png/zlib/nintendods/Makefile
+++ /dev/null
@@ -1,126 +0,0 @@
-#---------------------------------------------------------------------------------
-.SUFFIXES:
-#---------------------------------------------------------------------------------
-
-ifeq ($(strip $(DEVKITARM)),)
-$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
-endif
-
-include $(DEVKITARM)/ds_rules
-
-#---------------------------------------------------------------------------------
-# TARGET is the name of the output
-# BUILD is the directory where object files & intermediate files will be placed
-# SOURCES is a list of directories containing source code
-# DATA is a list of directories containing data files
-# INCLUDES is a list of directories containing header files
-#---------------------------------------------------------------------------------
-TARGET		:=	$(shell basename $(CURDIR))
-BUILD		:=	build
-SOURCES		:=	../../
-DATA		:=	data
-INCLUDES	:=	include
-
-#---------------------------------------------------------------------------------
-# options for code generation
-#---------------------------------------------------------------------------------
-ARCH	:=	-mthumb -mthumb-interwork
-
-CFLAGS	:=	-Wall -O2\
-		-march=armv5te -mtune=arm946e-s \
-		-fomit-frame-pointer -ffast-math \
-		$(ARCH)
-
-CFLAGS	+=	$(INCLUDE) -DARM9
-CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions
-
-ASFLAGS	:=	$(ARCH) -march=armv5te -mtune=arm946e-s
-LDFLAGS	=	-specs=ds_arm9.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)
-
-#---------------------------------------------------------------------------------
-# list of directories containing libraries, this must be the top level containing
-# include and lib
-#---------------------------------------------------------------------------------
-LIBDIRS	:=	$(LIBNDS)
-
-#---------------------------------------------------------------------------------
-# no real need to edit anything past this point unless you need to add additional
-# rules for different file extensions
-#---------------------------------------------------------------------------------
-ifneq ($(BUILD),$(notdir $(CURDIR)))
-#---------------------------------------------------------------------------------
-
-export OUTPUT	:=	$(CURDIR)/lib/libz.a
-
-export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
-			$(foreach dir,$(DATA),$(CURDIR)/$(dir))
-
-export DEPSDIR	:=	$(CURDIR)/$(BUILD)
-
-CFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
-CPPFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
-SFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
-BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
-
-#---------------------------------------------------------------------------------
-# use CXX for linking C++ projects, CC for standard C
-#---------------------------------------------------------------------------------
-ifeq ($(strip $(CPPFILES)),)
-#---------------------------------------------------------------------------------
-	export LD	:=	$(CC)
-#---------------------------------------------------------------------------------
-else
-#---------------------------------------------------------------------------------
-	export LD	:=	$(CXX)
-#---------------------------------------------------------------------------------
-endif
-#---------------------------------------------------------------------------------
-
-export OFILES	:=	$(addsuffix .o,$(BINFILES)) \
-			$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
-
-export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
-			$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
-			-I$(CURDIR)/$(BUILD)
-
-.PHONY: $(BUILD) clean all
-
-#---------------------------------------------------------------------------------
-all: $(BUILD)
-	@[ -d $@ ] || mkdir -p include
-	@cp ../../*.h include
-
-lib:
-	@[ -d $@ ] || mkdir -p $@
-	
-$(BUILD): lib
-	@[ -d $@ ] || mkdir -p $@
-	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
-
-#---------------------------------------------------------------------------------
-clean:
-	@echo clean ...
-	@rm -fr $(BUILD) lib
-
-#---------------------------------------------------------------------------------
-else
-
-DEPENDS	:=	$(OFILES:.o=.d)
-
-#---------------------------------------------------------------------------------
-# main targets
-#---------------------------------------------------------------------------------
-$(OUTPUT)	:	$(OFILES)
-
-#---------------------------------------------------------------------------------
-%.bin.o	:	%.bin
-#---------------------------------------------------------------------------------
-	@echo $(notdir $<)
-	@$(bin2o)
-
-
--include $(DEPENDS)
-
-#---------------------------------------------------------------------------------------
-endif
-#---------------------------------------------------------------------------------------
diff --git a/src/png/zlib/nintendods/README b/src/png/zlib/nintendods/README
deleted file mode 100644
index ba7a37dbe..000000000
--- a/src/png/zlib/nintendods/README
+++ /dev/null
@@ -1,5 +0,0 @@
-This Makefile requires devkitARM (http://www.devkitpro.org/category/devkitarm/) and works inside "contrib/nds". It is based on a devkitARM template.
-
-Eduardo Costa <eduardo.m.costa@gmail.com>
-January 3, 2009
-
diff --git a/src/png/zlib/old/Makefile.emx b/src/png/zlib/old/Makefile.emx
deleted file mode 100644
index 612b03791..000000000
--- a/src/png/zlib/old/Makefile.emx
+++ /dev/null
@@ -1,69 +0,0 @@
-# Makefile for zlib.  Modified for emx/rsxnt by Chr. Spieler, 6/16/98.
-# Copyright (C) 1995-1998 Jean-loup Gailly.
-# For conditions of distribution and use, see copyright notice in zlib.h
-
-# To compile, or to compile and test, type:
-#
-#   make -fmakefile.emx;  make test -fmakefile.emx
-#
-
-CC=gcc -Zwin32
-
-#CFLAGS=-MMD -O
-#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS=-MMD -g -DZLIB_DEBUG
-CFLAGS=-MMD -O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
-             -Wstrict-prototypes -Wmissing-prototypes
-
-# If cp.exe is available, replace "copy /Y" with "cp -fp" .
-CP=copy /Y
-# If gnu install.exe is available, replace $(CP) with ginstall.
-INSTALL=$(CP)
-# The default value of RM is "rm -f."  If "rm.exe" is found, comment out:
-RM=del
-LDLIBS=-L. -lzlib
-LD=$(CC) -s -o
-LDSHARED=$(CC)
-
-INCL=zlib.h zconf.h
-LIBS=zlib.a
-
-AR=ar rcs
-
-prefix=/usr/local
-exec_prefix = $(prefix)
-
-OBJS = adler32.o compress.o crc32.o deflate.o gzclose.o gzlib.o gzread.o \
-       gzwrite.o infback.o inffast.o inflate.o inftrees.o trees.o uncompr.o zutil.o
-
-TEST_OBJS = example.o minigzip.o
-
-all: example.exe minigzip.exe
-
-test: all
-	./example
-	echo hello world | .\minigzip | .\minigzip -d
-
-%.o : %.c
-	$(CC) $(CFLAGS) -c $< -o $@
-
-zlib.a: $(OBJS)
-	$(AR) $@ $(OBJS)
-
-%.exe : %.o $(LIBS)
-	$(LD) $@ $< $(LDLIBS)
-
-
-.PHONY : clean
-
-clean:
-	$(RM) *.d
-	$(RM) *.o
-	$(RM) *.exe
-	$(RM) zlib.a
-	$(RM) foo.gz
-
-DEPS := $(wildcard *.d)
-ifneq ($(DEPS),)
-include $(DEPS)
-endif
diff --git a/src/png/zlib/old/Makefile.riscos b/src/png/zlib/old/Makefile.riscos
deleted file mode 100644
index 57e29d3fb..000000000
--- a/src/png/zlib/old/Makefile.riscos
+++ /dev/null
@@ -1,151 +0,0 @@
-# Project:   zlib_1_03
-# Patched for zlib 1.1.2 rw@shadow.org.uk 19980430
-# test works out-of-the-box, installs `somewhere' on demand
-
-# Toolflags:
-CCflags = -c -depend !Depend -IC: -g -throwback  -DRISCOS  -fah
-C++flags = -c -depend !Depend -IC: -throwback
-Linkflags = -aif -c++ -o $@
-ObjAsmflags = -throwback -NoCache -depend !Depend
-CMHGflags =
-LibFileflags = -c -l -o $@
-Squeezeflags = -o $@
-
-# change the line below to where _you_ want the library installed.
-libdest = lib:zlib
-
-# Final targets:
-@.lib:   @.o.adler32 @.o.compress @.o.crc32 @.o.deflate @.o.gzio \
-        @.o.infblock @.o.infcodes @.o.inffast @.o.inflate @.o.inftrees @.o.infutil @.o.trees \
-        @.o.uncompr @.o.zutil
-        LibFile $(LibFileflags) @.o.adler32 @.o.compress @.o.crc32 @.o.deflate \
-        @.o.gzio @.o.infblock @.o.infcodes @.o.inffast @.o.inflate @.o.inftrees @.o.infutil \
-        @.o.trees @.o.uncompr @.o.zutil
-test:   @.minigzip @.example @.lib
-	@copy @.lib @.libc  A~C~DF~L~N~P~Q~RS~TV
-	@echo running tests: hang on.
-	@/@.minigzip -f -9 libc
-	@/@.minigzip -d libc-gz
-	@/@.minigzip -f -1 libc
-	@/@.minigzip -d libc-gz
-	@/@.minigzip -h -9 libc
-	@/@.minigzip -d libc-gz
-	@/@.minigzip -h -1 libc
-	@/@.minigzip -d libc-gz
-	@/@.minigzip -9 libc
-	@/@.minigzip -d libc-gz
-	@/@.minigzip -1 libc
-	@/@.minigzip -d libc-gz
-	@diff @.lib @.libc
-	@echo that should have reported '@.lib and @.libc identical' if you have diff.
-	@/@.example @.fred @.fred
-	@echo that will have given lots of hello!'s.
-
-@.minigzip:   @.o.minigzip @.lib C:o.Stubs
-        Link $(Linkflags) @.o.minigzip @.lib C:o.Stubs
-@.example:   @.o.example @.lib C:o.Stubs
-        Link $(Linkflags) @.o.example @.lib C:o.Stubs
-
-install: @.lib
-	cdir $(libdest)
-	cdir $(libdest).h
-	@copy @.h.zlib $(libdest).h.zlib A~C~DF~L~N~P~Q~RS~TV
-	@copy @.h.zconf $(libdest).h.zconf A~C~DF~L~N~P~Q~RS~TV
-	@copy @.lib $(libdest).lib  A~C~DF~L~N~P~Q~RS~TV
-	@echo okay, installed zlib in $(libdest)
-
-clean:; remove @.minigzip
-	remove @.example
-	remove @.libc
-	-wipe @.o.* F~r~cV
-	remove @.fred
-
-# User-editable dependencies:
-.c.o:
-        cc $(ccflags) -o $@ $<
-
-# Static dependencies:
-
-# Dynamic dependencies:
-o.example:	c.example
-o.example:	h.zlib
-o.example:	h.zconf
-o.minigzip:	c.minigzip
-o.minigzip:	h.zlib
-o.minigzip:	h.zconf
-o.adler32:	c.adler32
-o.adler32:	h.zlib
-o.adler32:	h.zconf
-o.compress:	c.compress
-o.compress:	h.zlib
-o.compress:	h.zconf
-o.crc32:	c.crc32
-o.crc32:	h.zlib
-o.crc32:	h.zconf
-o.deflate:	c.deflate
-o.deflate:	h.deflate
-o.deflate:	h.zutil
-o.deflate:	h.zlib
-o.deflate:	h.zconf
-o.gzio:	c.gzio
-o.gzio:	h.zutil
-o.gzio:	h.zlib
-o.gzio:	h.zconf
-o.infblock:	c.infblock
-o.infblock:	h.zutil
-o.infblock:	h.zlib
-o.infblock:	h.zconf
-o.infblock:	h.infblock
-o.infblock:	h.inftrees
-o.infblock:	h.infcodes
-o.infblock:	h.infutil
-o.infcodes:	c.infcodes
-o.infcodes:	h.zutil
-o.infcodes:	h.zlib
-o.infcodes:	h.zconf
-o.infcodes:	h.inftrees
-o.infcodes:	h.infblock
-o.infcodes:	h.infcodes
-o.infcodes:	h.infutil
-o.infcodes:	h.inffast
-o.inffast:	c.inffast
-o.inffast:	h.zutil
-o.inffast:	h.zlib
-o.inffast:	h.zconf
-o.inffast:	h.inftrees
-o.inffast:	h.infblock
-o.inffast:	h.infcodes
-o.inffast:	h.infutil
-o.inffast:	h.inffast
-o.inflate:	c.inflate
-o.inflate:	h.zutil
-o.inflate:	h.zlib
-o.inflate:	h.zconf
-o.inflate:	h.infblock
-o.inftrees:	c.inftrees
-o.inftrees:	h.zutil
-o.inftrees:	h.zlib
-o.inftrees:	h.zconf
-o.inftrees:	h.inftrees
-o.inftrees:	h.inffixed
-o.infutil:	c.infutil
-o.infutil:	h.zutil
-o.infutil:	h.zlib
-o.infutil:	h.zconf
-o.infutil:	h.infblock
-o.infutil:	h.inftrees
-o.infutil:	h.infcodes
-o.infutil:	h.infutil
-o.trees:	c.trees
-o.trees:	h.deflate
-o.trees:	h.zutil
-o.trees:	h.zlib
-o.trees:	h.zconf
-o.trees:	h.trees
-o.uncompr:	c.uncompr
-o.uncompr:	h.zlib
-o.uncompr:	h.zconf
-o.zutil:	c.zutil
-o.zutil:	h.zutil
-o.zutil:	h.zlib
-o.zutil:	h.zconf
diff --git a/src/png/zlib/old/README b/src/png/zlib/old/README
deleted file mode 100644
index 800bf0798..000000000
--- a/src/png/zlib/old/README
+++ /dev/null
@@ -1,3 +0,0 @@
-This directory contains files that have not been updated for zlib 1.2.x
-
-(Volunteers are encouraged to help clean this up.  Thanks.)
diff --git a/src/png/zlib/old/descrip.mms b/src/png/zlib/old/descrip.mms
deleted file mode 100644
index 7066da5b5..000000000
--- a/src/png/zlib/old/descrip.mms
+++ /dev/null
@@ -1,48 +0,0 @@
-# descrip.mms: MMS description file for building zlib on VMS
-# written by Martin P.J. Zinser <m.zinser@gsi.de>
-
-cc_defs =
-c_deb =
-
-.ifdef __DECC__
-pref = /prefix=all
-.endif
-
-OBJS = adler32.obj, compress.obj, crc32.obj, gzio.obj, uncompr.obj,\
-       deflate.obj, trees.obj, zutil.obj, inflate.obj, infblock.obj,\
-       inftrees.obj, infcodes.obj, infutil.obj, inffast.obj
-
-CFLAGS= $(C_DEB) $(CC_DEFS) $(PREF)
-
-all : example.exe minigzip.exe
-        @ write sys$output " Example applications available"
-libz.olb : libz.olb($(OBJS))
-	@ write sys$output " libz available"
-
-example.exe : example.obj libz.olb
-              link example,libz.olb/lib
-
-minigzip.exe : minigzip.obj libz.olb
-              link minigzip,libz.olb/lib,x11vms:xvmsutils.olb/lib
-
-clean :
-	delete *.obj;*,libz.olb;*
-
-
-# Other dependencies.
-adler32.obj : zutil.h zlib.h zconf.h
-compress.obj : zlib.h zconf.h
-crc32.obj : zutil.h zlib.h zconf.h
-deflate.obj : deflate.h zutil.h zlib.h zconf.h
-example.obj : zlib.h zconf.h
-gzio.obj : zutil.h zlib.h zconf.h
-infblock.obj : zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
-infcodes.obj : zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h inffast.h
-inffast.obj : zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
-inflate.obj : zutil.h zlib.h zconf.h infblock.h
-inftrees.obj : zutil.h zlib.h zconf.h inftrees.h
-infutil.obj : zutil.h zlib.h zconf.h inftrees.h infutil.h
-minigzip.obj : zlib.h zconf.h
-trees.obj : deflate.h zutil.h zlib.h zconf.h
-uncompr.obj : zlib.h zconf.h
-zutil.obj : zutil.h zlib.h zconf.h
diff --git a/src/png/zlib/old/os2/Makefile.os2 b/src/png/zlib/old/os2/Makefile.os2
deleted file mode 100644
index bb426c0d8..000000000
--- a/src/png/zlib/old/os2/Makefile.os2
+++ /dev/null
@@ -1,136 +0,0 @@
-# Makefile for zlib under OS/2 using GCC (PGCC)
-# For conditions of distribution and use, see copyright notice in zlib.h
-
-# To compile and test, type:
-#   cp Makefile.os2 ..
-#   cd ..
-#   make -f Makefile.os2 test
-
-# This makefile will build a static library z.lib, a shared library
-# z.dll and a import library zdll.lib. You can use either z.lib or
-# zdll.lib by specifying either -lz or -lzdll on gcc's command line
-
-CC=gcc -Zomf -s
-
-CFLAGS=-O6 -Wall
-#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS=-g -DZLIB_DEBUG
-#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
-#           -Wstrict-prototypes -Wmissing-prototypes
-
-#################### BUG WARNING: #####################
-## infcodes.c hits a bug in pgcc-1.0, so you have to use either
-## -O# where # <= 4 or one of (-fno-ommit-frame-pointer or -fno-force-mem)
-## This bug is reportedly fixed in pgcc >1.0, but this was not tested
-CFLAGS+=-fno-force-mem
-
-LDFLAGS=-s -L. -lzdll -Zcrtdll
-LDSHARED=$(CC) -s -Zomf -Zdll -Zcrtdll
-
-VER=1.1.0
-ZLIB=z.lib
-SHAREDLIB=z.dll
-SHAREDLIBIMP=zdll.lib
-LIBS=$(ZLIB) $(SHAREDLIB) $(SHAREDLIBIMP)
-
-AR=emxomfar cr
-IMPLIB=emximp
-RANLIB=echo
-TAR=tar
-SHELL=bash
-
-prefix=/usr/local
-exec_prefix = $(prefix)
-
-OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
-       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
-
-TEST_OBJS = example.o minigzip.o
-
-DISTFILES = README INDEX ChangeLog configure Make*[a-z0-9] *.[ch] descrip.mms \
-  algorithm.txt zlib.3 msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \
-  nt/Makefile.nt nt/zlib.dnt  contrib/README.contrib contrib/*.txt \
-  contrib/asm386/*.asm contrib/asm386/*.c \
-  contrib/asm386/*.bat contrib/asm386/zlibvc.d?? contrib/iostream/*.cpp \
-  contrib/iostream/*.h  contrib/iostream2/*.h contrib/iostream2/*.cpp \
-  contrib/untgz/Makefile contrib/untgz/*.c contrib/untgz/*.w32
-
-all: example.exe minigzip.exe
-
-test: all
-	@LD_LIBRARY_PATH=.:$(LD_LIBRARY_PATH) ; export LD_LIBRARY_PATH; \
-	echo hello world | ./minigzip | ./minigzip -d || \
-	  echo '		*** minigzip test FAILED ***' ; \
-	if ./example; then \
-	  echo '		*** zlib test OK ***'; \
-	else \
-	  echo '		*** zlib test FAILED ***'; \
-	fi
-
-$(ZLIB): $(OBJS)
-	$(AR) $@ $(OBJS)
-	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1
-
-$(SHAREDLIB): $(OBJS) os2/z.def
-	$(LDSHARED) -o $@ $^
-
-$(SHAREDLIBIMP): os2/z.def
-	$(IMPLIB) -o $@ $^
-
-example.exe: example.o $(LIBS)
-	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS)
-
-minigzip.exe: minigzip.o $(LIBS)
-	$(CC) $(CFLAGS) -o $@ minigzip.o $(LDFLAGS)
-
-clean:
-	rm -f *.o *~ example minigzip libz.a libz.so* foo.gz
-
-distclean:	clean
-
-zip:
-	mv Makefile Makefile~; cp -p Makefile.in Makefile
-	rm -f test.c ztest*.c
-	v=`sed -n -e 's/\.//g' -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
-	zip -ul9 zlib$$v $(DISTFILES)
-	mv Makefile~ Makefile
-
-dist:
-	mv Makefile Makefile~; cp -p Makefile.in Makefile
-	rm -f test.c ztest*.c
-	d=zlib-`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
-	rm -f $$d.tar.gz; \
-	if test ! -d ../$$d; then rm -f ../$$d; ln -s `pwd` ../$$d; fi; \
-	files=""; \
-	for f in $(DISTFILES); do files="$$files $$d/$$f"; done; \
-	cd ..; \
-	GZIP=-9 $(TAR) chofz $$d/$$d.tar.gz $$files; \
-	if test ! -d $$d; then rm -f $$d; fi
-	mv Makefile~ Makefile
-
-tags:
-	etags *.[ch]
-
-depend:
-	makedepend -- $(CFLAGS) -- *.[ch]
-
-# DO NOT DELETE THIS LINE -- make depend depends on it.
-
-adler32.o: zlib.h zconf.h
-compress.o: zlib.h zconf.h
-crc32.o: zlib.h zconf.h
-deflate.o: deflate.h zutil.h zlib.h zconf.h
-example.o: zlib.h zconf.h
-gzio.o: zutil.h zlib.h zconf.h
-infblock.o: infblock.h inftrees.h infcodes.h infutil.h zutil.h zlib.h zconf.h
-infcodes.o: zutil.h zlib.h zconf.h
-infcodes.o: inftrees.h infblock.h infcodes.h infutil.h inffast.h
-inffast.o: zutil.h zlib.h zconf.h inftrees.h
-inffast.o: infblock.h infcodes.h infutil.h inffast.h
-inflate.o: zutil.h zlib.h zconf.h infblock.h
-inftrees.o: zutil.h zlib.h zconf.h inftrees.h
-infutil.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
-minigzip.o: zlib.h zconf.h
-trees.o: deflate.h zutil.h zlib.h zconf.h trees.h
-uncompr.o: zlib.h zconf.h
-zutil.o: zutil.h zlib.h zconf.h
diff --git a/src/png/zlib/old/os2/zlib.def b/src/png/zlib/old/os2/zlib.def
deleted file mode 100644
index 4c753f1a3..000000000
--- a/src/png/zlib/old/os2/zlib.def
+++ /dev/null
@@ -1,51 +0,0 @@
-;
-; Slightly modified version of ../nt/zlib.dnt :-)
-;
-
-LIBRARY		Z
-DESCRIPTION	"Zlib compression library for OS/2"
-CODE		PRELOAD MOVEABLE DISCARDABLE
-DATA		PRELOAD MOVEABLE MULTIPLE
-
-EXPORTS
-    adler32
-    compress
-    crc32
-    deflate
-    deflateCopy
-    deflateEnd
-    deflateInit2_
-    deflateInit_
-    deflateParams
-    deflateReset
-    deflateSetDictionary
-    gzclose
-    gzdopen
-    gzerror
-    gzflush
-    gzopen
-    gzread
-    gzwrite
-    inflate
-    inflateEnd
-    inflateInit2_
-    inflateInit_
-    inflateReset
-    inflateSetDictionary
-    inflateSync
-    uncompress
-    zlibVersion
-    gzprintf
-    gzputc
-    gzgetc
-    gzseek
-    gzrewind
-    gztell
-    gzeof
-    gzsetparams
-    zError
-    inflateSyncPoint
-    get_crc_table
-    compress2
-    gzputs
-    gzgets
diff --git a/src/png/zlib/old/visual-basic.txt b/src/png/zlib/old/visual-basic.txt
deleted file mode 100644
index 57efe5812..000000000
--- a/src/png/zlib/old/visual-basic.txt
+++ /dev/null
@@ -1,160 +0,0 @@
-See below some functions declarations for Visual Basic.
-
-Frequently Asked Question:
-
-Q: Each time I use the compress function I get the -5 error (not enough
-   room in the output buffer).
-
-A: Make sure that the length of the compressed buffer is passed by
-   reference ("as any"), not by value ("as long"). Also check that
-   before the call of compress this length is equal to the total size of
-   the compressed buffer and not zero.
-
-
-From: "Jon Caruana" <jon-net@usa.net>
-Subject: Re: How to port zlib declares to vb?
-Date: Mon, 28 Oct 1996 18:33:03 -0600
-
-Got the answer! (I haven't had time to check this but it's what I got, and
-looks correct):
-
-He has the following routines working:
-        compress
-        uncompress
-        gzopen
-        gzwrite
-        gzread
-        gzclose
-
-Declares follow: (Quoted from Carlos Rios <c_rios@sonda.cl>, in Vb4 form)
-
-#If Win16 Then   'Use Win16 calls.
-Declare Function compress Lib "ZLIB.DLL" (ByVal compr As
-        String, comprLen As Any, ByVal buf As String, ByVal buflen
-        As Long) As Integer
-Declare Function uncompress Lib "ZLIB.DLL" (ByVal uncompr
-        As String, uncomprLen As Any, ByVal compr As String, ByVal
-        lcompr As Long) As Integer
-Declare Function gzopen Lib "ZLIB.DLL" (ByVal filePath As
-        String, ByVal mode As String) As Long
-Declare Function gzread Lib "ZLIB.DLL" (ByVal file As
-        Long, ByVal uncompr As String, ByVal uncomprLen As Integer)
-        As Integer
-Declare Function gzwrite Lib "ZLIB.DLL" (ByVal file As
-        Long, ByVal uncompr As String, ByVal uncomprLen As Integer)
-        As Integer
-Declare Function gzclose Lib "ZLIB.DLL" (ByVal file As
-        Long) As Integer
-#Else
-Declare Function compress Lib "ZLIB32.DLL"
-        (ByVal compr As String, comprLen As Any, ByVal buf As
-        String, ByVal buflen As Long) As Integer
-Declare Function uncompress Lib "ZLIB32.DLL"
-        (ByVal uncompr As String, uncomprLen As Any, ByVal compr As
-        String, ByVal lcompr As Long) As Long
-Declare Function gzopen Lib "ZLIB32.DLL"
-        (ByVal file As String, ByVal mode As String) As Long
-Declare Function gzread Lib "ZLIB32.DLL"
-        (ByVal file As Long, ByVal uncompr As String, ByVal
-        uncomprLen As Long) As Long
-Declare Function gzwrite Lib "ZLIB32.DLL"
-        (ByVal file As Long, ByVal uncompr As String, ByVal
-        uncomprLen As Long) As Long
-Declare Function gzclose Lib "ZLIB32.DLL"
-        (ByVal file As Long) As Long
-#End If
-
--Jon Caruana
-jon-net@usa.net
-Microsoft Sitebuilder Network Level 1 Member - HTML Writer's Guild Member
-
-
-Here is another example from Michael <michael_borgsys@hotmail.com> that he
-says conforms to the VB guidelines, and that solves the problem of not
-knowing the uncompressed size by storing it at the end of the file:
-
-'Calling the functions:
-'bracket meaning: <parameter> [optional] {Range of possible values}
-'Call subCompressFile(<path with filename to compress> [, <path with
-filename to write to>, [level of compression {1..9}]])
-'Call subUncompressFile(<path with filename to compress>)
-
-Option Explicit
-Private lngpvtPcnSml As Long 'Stores value for 'lngPercentSmaller'
-Private Const SUCCESS As Long = 0
-Private Const strFilExt As String = ".cpr"
-Private Declare Function lngfncCpr Lib "zlib.dll" Alias "compress2" (ByRef
-dest As Any, ByRef destLen As Any, ByRef src As Any, ByVal srcLen As Long,
-ByVal level As Integer) As Long
-Private Declare Function lngfncUcp Lib "zlib.dll" Alias "uncompress" (ByRef
-dest As Any, ByRef destLen As Any, ByRef src As Any, ByVal srcLen As Long)
-As Long
-
-Public Sub subCompressFile(ByVal strargOriFilPth As String, Optional ByVal
-strargCprFilPth As String, Optional ByVal intLvl As Integer = 9)
-    Dim strCprPth As String
-    Dim lngOriSiz As Long
-    Dim lngCprSiz As Long
-    Dim bytaryOri() As Byte
-    Dim bytaryCpr() As Byte
-    lngOriSiz = FileLen(strargOriFilPth)
-    ReDim bytaryOri(lngOriSiz - 1)
-    Open strargOriFilPth For Binary Access Read As #1
-        Get #1, , bytaryOri()
-    Close #1
-    strCprPth = IIf(strargCprFilPth = "", strargOriFilPth, strargCprFilPth)
-'Select file path and name
-    strCprPth = strCprPth & IIf(Right(strCprPth, Len(strFilExt)) =
-strFilExt, "", strFilExt) 'Add file extension if not exists
-    lngCprSiz = (lngOriSiz * 1.01) + 12 'Compression needs temporary a bit
-more space then original file size
-    ReDim bytaryCpr(lngCprSiz - 1)
-    If lngfncCpr(bytaryCpr(0), lngCprSiz, bytaryOri(0), lngOriSiz, intLvl) =
-SUCCESS Then
-        lngpvtPcnSml = (1# - (lngCprSiz / lngOriSiz)) * 100
-        ReDim Preserve bytaryCpr(lngCprSiz - 1)
-        Open strCprPth For Binary Access Write As #1
-            Put #1, , bytaryCpr()
-            Put #1, , lngOriSiz 'Add the the original size value to the end
-(last 4 bytes)
-        Close #1
-    Else
-        MsgBox "Compression error"
-    End If
-    Erase bytaryCpr
-    Erase bytaryOri
-End Sub
-
-Public Sub subUncompressFile(ByVal strargFilPth As String)
-    Dim bytaryCpr() As Byte
-    Dim bytaryOri() As Byte
-    Dim lngOriSiz As Long
-    Dim lngCprSiz As Long
-    Dim strOriPth As String
-    lngCprSiz = FileLen(strargFilPth)
-    ReDim bytaryCpr(lngCprSiz - 1)
-    Open strargFilPth For Binary Access Read As #1
-        Get #1, , bytaryCpr()
-    Close #1
-    'Read the original file size value:
-    lngOriSiz = bytaryCpr(lngCprSiz - 1) * (2 ^ 24) _
-              + bytaryCpr(lngCprSiz - 2) * (2 ^ 16) _
-              + bytaryCpr(lngCprSiz - 3) * (2 ^ 8) _
-              + bytaryCpr(lngCprSiz - 4)
-    ReDim Preserve bytaryCpr(lngCprSiz - 5) 'Cut of the original size value
-    ReDim bytaryOri(lngOriSiz - 1)
-    If lngfncUcp(bytaryOri(0), lngOriSiz, bytaryCpr(0), lngCprSiz) = SUCCESS
-Then
-        strOriPth = Left(strargFilPth, Len(strargFilPth) - Len(strFilExt))
-        Open strOriPth For Binary Access Write As #1
-            Put #1, , bytaryOri()
-        Close #1
-    Else
-        MsgBox "Uncompression error"
-    End If
-    Erase bytaryCpr
-    Erase bytaryOri
-End Sub
-Public Property Get lngPercentSmaller() As Long
-    lngPercentSmaller = lngpvtPcnSml
-End Property
diff --git a/src/png/zlib/os400/README400 b/src/png/zlib/os400/README400
deleted file mode 100644
index 4f98334f5..000000000
--- a/src/png/zlib/os400/README400
+++ /dev/null
@@ -1,48 +0,0 @@
-        ZLIB version 1.2.11 for OS/400 installation instructions
-
-1) Download and unpack the zlib tarball to some IFS directory.
-   (i.e.: /path/to/the/zlib/ifs/source/directory)
-
-   If the installed IFS command suppors gzip format, this is straightforward,
-else you have to unpack first to some directory on a system supporting it,
-then move the whole directory to the IFS via the network (via SMB or FTP).
-
-2) Edit the configuration parameters in the compilation script.
-
-        EDTF STMF('/path/to/the/zlib/ifs/source/directory/os400/make.sh')
-
-Tune the parameters according to your needs if not matching the defaults.
-Save the file and exit after edition.
-
-3) Enter qshell, then work in the zlib OS/400 specific directory.
-
-        QSH
-        cd /path/to/the/zlib/ifs/source/directory/os400
-
-4) Compile and install
-
-        sh make.sh
-
-The script will:
-- create the libraries, objects and IFS directories for the zlib environment,
-- compile all modules,
-- create a service program,
-- create a static and a dynamic binding directory,
-- install header files for C/C++ and for ILE/RPG, both for compilation in
-  DB2 and IFS environments.
-
-That's all. 
-
-
-Notes:  For OS/400 ILE RPG programmers, a /copy member defining the ZLIB
-                API prototypes for ILE RPG can be found in ZLIB/H(ZLIB.INC).
-                In the ILE environment, the same definitions are available from
-                file zlib.inc located in the same IFS include directory as the
-                C/C++ header files.
-                Please read comments in this member for more information.
-
-        Remember that most foreign textual data are ASCII coded: this
-                implementation does not handle conversion from/to ASCII, so
-                text data code conversions must be done explicitely.
-
-        Mainly for the reason above, always open zipped files in binary mode.
diff --git a/src/png/zlib/os400/bndsrc b/src/png/zlib/os400/bndsrc
deleted file mode 100644
index 5e6e0a2f0..000000000
--- a/src/png/zlib/os400/bndsrc
+++ /dev/null
@@ -1,119 +0,0 @@
-STRPGMEXP PGMLVL(*CURRENT) SIGNATURE('ZLIB')
-
-/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
-/*   Version 1.1.3 entry points.                                    */
-/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
-
-  EXPORT SYMBOL("adler32")
-  EXPORT SYMBOL("compress")
-  EXPORT SYMBOL("compress2")
-  EXPORT SYMBOL("crc32")
-  EXPORT SYMBOL("get_crc_table")
-  EXPORT SYMBOL("deflate")
-  EXPORT SYMBOL("deflateEnd")
-  EXPORT SYMBOL("deflateSetDictionary")
-  EXPORT SYMBOL("deflateCopy")
-  EXPORT SYMBOL("deflateReset")
-  EXPORT SYMBOL("deflateParams")
-  EXPORT SYMBOL("deflatePrime")
-  EXPORT SYMBOL("deflateInit_")
-  EXPORT SYMBOL("deflateInit2_")
-  EXPORT SYMBOL("gzopen")
-  EXPORT SYMBOL("gzdopen")
-  EXPORT SYMBOL("gzsetparams")
-  EXPORT SYMBOL("gzread")
-  EXPORT SYMBOL("gzwrite")
-  EXPORT SYMBOL("gzprintf")
-  EXPORT SYMBOL("gzputs")
-  EXPORT SYMBOL("gzgets")
-  EXPORT SYMBOL("gzputc")
-  EXPORT SYMBOL("gzgetc")
-  EXPORT SYMBOL("gzflush")
-  EXPORT SYMBOL("gzseek")
-  EXPORT SYMBOL("gzrewind")
-  EXPORT SYMBOL("gztell")
-  EXPORT SYMBOL("gzeof")
-  EXPORT SYMBOL("gzclose")
-  EXPORT SYMBOL("gzerror")
-  EXPORT SYMBOL("inflate")
-  EXPORT SYMBOL("inflateEnd")
-  EXPORT SYMBOL("inflateSetDictionary")
-  EXPORT SYMBOL("inflateSync")
-  EXPORT SYMBOL("inflateReset")
-  EXPORT SYMBOL("inflateInit_")
-  EXPORT SYMBOL("inflateInit2_")
-  EXPORT SYMBOL("inflateSyncPoint")
-  EXPORT SYMBOL("uncompress")
-  EXPORT SYMBOL("zlibVersion")
-  EXPORT SYMBOL("zError")
-  EXPORT SYMBOL("z_errmsg")
-
-/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
-/*   Version 1.2.1 additional entry points.                         */
-/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
-
-  EXPORT SYMBOL("compressBound")
-  EXPORT SYMBOL("deflateBound")
-  EXPORT SYMBOL("deflatePending")
-  EXPORT SYMBOL("gzungetc")
-  EXPORT SYMBOL("gzclearerr")
-  EXPORT SYMBOL("inflateBack")
-  EXPORT SYMBOL("inflateBackEnd")
-  EXPORT SYMBOL("inflateBackInit_")
-  EXPORT SYMBOL("inflateCopy")
-  EXPORT SYMBOL("zlibCompileFlags")
-
-/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
-/*   Version 1.2.4 additional entry points.                         */
-/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
-
-  EXPORT SYMBOL("adler32_combine")
-  EXPORT SYMBOL("adler32_combine64")
-  EXPORT SYMBOL("crc32_combine")
-  EXPORT SYMBOL("crc32_combine64")
-  EXPORT SYMBOL("deflateSetHeader")
-  EXPORT SYMBOL("deflateTune")
-  EXPORT SYMBOL("gzbuffer")
-  EXPORT SYMBOL("gzclose_r")
-  EXPORT SYMBOL("gzclose_w")
-  EXPORT SYMBOL("gzdirect")
-  EXPORT SYMBOL("gzoffset")
-  EXPORT SYMBOL("gzoffset64")
-  EXPORT SYMBOL("gzopen64")
-  EXPORT SYMBOL("gzseek64")
-  EXPORT SYMBOL("gztell64")
-  EXPORT SYMBOL("inflateGetHeader")
-  EXPORT SYMBOL("inflateMark")
-  EXPORT SYMBOL("inflatePrime")
-  EXPORT SYMBOL("inflateReset2")
-  EXPORT SYMBOL("inflateUndermine")
-
-/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
-/*   Version 1.2.6 additional entry points.                         */
-/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
-
-  EXPORT SYMBOL("deflateResetKeep")
-  EXPORT SYMBOL("gzgetc_")
-  EXPORT SYMBOL("inflateResetKeep")
-
-/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
-/*   Version 1.2.8 additional entry points.                         */
-/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
-
-  EXPORT SYMBOL("gzvprintf")
-  EXPORT SYMBOL("inflateGetDictionary")
-
-/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
-/*   Version 1.2.9 additional entry points.                         */
-/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
-
-  EXPORT SYMBOL("adler32_z")
-  EXPORT SYMBOL("crc32_z")
-  EXPORT SYMBOL("deflateGetDictionary")
-  EXPORT SYMBOL("gzfread")
-  EXPORT SYMBOL("gzfwrite")
-  EXPORT SYMBOL("inflateCodesUsed")
-  EXPORT SYMBOL("inflateValidate")
-  EXPORT SYMBOL("uncompress2")
-
-ENDPGMEXP
diff --git a/src/png/zlib/os400/make.sh b/src/png/zlib/os400/make.sh
deleted file mode 100644
index 19eec117a..000000000
--- a/src/png/zlib/os400/make.sh
+++ /dev/null
@@ -1,366 +0,0 @@
-#!/bin/sh
-#
-#       ZLIB compilation script for the OS/400.
-#
-#
-#       This is a shell script since make is not a standard component of OS/400.
-
-
-################################################################################
-#
-#                       Tunable configuration parameters.
-#
-################################################################################
-
-TARGETLIB='ZLIB'                # Target OS/400 program library
-STATBNDDIR='ZLIB_A'             # Static binding directory.
-DYNBNDDIR='ZLIB'                # Dynamic binding directory.
-SRVPGM="ZLIB"                   # Service program.
-IFSDIR='/zlib'                  # IFS support base directory.
-TGTCCSID='500'                  # Target CCSID of objects
-DEBUG='*NONE'                   # Debug level
-OPTIMIZE='40'                   # Optimisation level
-OUTPUT='*NONE'                  # Compilation output option.
-TGTRLS='V6R1M0'                 # Target OS release
-
-export TARGETLIB STATBNDDIR DYNBNDDIR SRVPGM IFSDIR
-export TGTCCSID DEBUG OPTIMIZE OUTPUT TGTRLS
-
-
-################################################################################
-#
-#                       OS/400 specific definitions.
-#
-################################################################################
-
-LIBIFSNAME="/QSYS.LIB/${TARGETLIB}.LIB"
-
-
-################################################################################
-#
-#                               Procedures.
-#
-################################################################################
-
-#       action_needed dest [src]
-#
-#       dest is an object to build
-#       if specified, src is an object on which dest depends.
-#
-#       exit 0 (succeeds) if some action has to be taken, else 1.
-
-action_needed()
-
-{
-        [ ! -e "${1}" ] && return 0
-        [ "${2}" ] || return 1
-        [ "${1}" -ot "${2}" ] && return 0
-        return 1
-}
-
-
-#       make_module module_name source_name [additional_definitions]
-#
-#       Compile source name into module if needed.
-#       As side effect, append the module name to variable MODULES.
-#       Set LINK to "YES" if the module has been compiled.
-
-make_module()
-
-{
-    MODULES="${MODULES} ${1}"
-    MODIFSNAME="${LIBIFSNAME}/${1}.MODULE"
-    CSRC="`basename \"${2}\"`"
-
-    if action_needed "${MODIFSNAME}" "${2}"
-    then    :
-    elif [ ! "`sed -e \"/<source name=\\\"${CSRC}\\\">/,/<\\\\/source>/!d\" \
-      -e '/<depend /!d'                                                 \
-      -e 's/.* name=\"\\([^\"]*\\)\".*/\\1/' < \"${TOPDIR}/treebuild.xml\" |
-        while read HDR
-        do      if action_needed \"${MODIFSNAME}\" \"${IFSDIR}/include/${HDR}\"
-                then    echo recompile
-                        break
-                fi
-        done`" ]
-    then    return 0
-    fi
-
-    CMD="CRTCMOD MODULE(${TARGETLIB}/${1}) SRCSTMF('${2}')"
-    CMD="${CMD} SYSIFCOPT(*IFS64IO) OPTION(*INCDIRFIRST)"
-    CMD="${CMD} LOCALETYPE(*LOCALE) FLAG(10)"
-    CMD="${CMD} INCDIR('${IFSDIR}/include' ${INCLUDES})"
-    CMD="${CMD} TGTCCSID(${TGTCCSID}) TGTRLS(${TGTRLS})"
-    CMD="${CMD} OUTPUT(${OUTPUT})"
-    CMD="${CMD} OPTIMIZE(${OPTIMIZE})"
-    CMD="${CMD} DBGVIEW(${DEBUG})"
-    system "${CMD}"
-    LINK=YES
-}
-
-
-#       Determine DB2 object name from IFS name.
-
-db2_name()
-
-{
-        basename "${1}"                                                 |
-        tr 'a-z-' 'A-Z_'                                                |
-        sed -e 's/\..*//'                                               \
-            -e 's/^\(.\).*\(.........\)$/\1\2/'
-}
-
-
-#       Force enumeration types to be the same size as integers.
-
-copy_hfile()
-
-{
-        sed -e '1i\
-#pragma enum(int)\
-' "${@}" -e '$a\
-#pragma enum(pop)\
-'
-}
-
-
-################################################################################
-#
-#                             Script initialization.
-#
-################################################################################
-
-SCRIPTDIR=`dirname "${0}"`
-
-case "${SCRIPTDIR}" in
-/*)     ;;
-*)      SCRIPTDIR="`pwd`/${SCRIPTDIR}"
-esac
-
-while true
-do      case "${SCRIPTDIR}" in
-        */.)    SCRIPTDIR="${SCRIPTDIR%/.}";;
-        *)      break;;
-        esac
-done
-
-#  The script directory is supposed to be in ${TOPDIR}/os400.
-
-TOPDIR=`dirname "${SCRIPTDIR}"`
-export SCRIPTDIR TOPDIR
-cd "${TOPDIR}"
-
-
-#  Extract the version from the master compilation XML file.
-
-VERSION=`sed -e '/^<package /!d'                                        \
-            -e 's/^.* version="\([0-9.]*\)".*$/\1/' -e 'q'              \
-            < treebuild.xml`
-export VERSION
-
-################################################################################
-
-
-#       Create the OS/400 library if it does not exist.
-
-if action_needed "${LIBIFSNAME}"
-then    CMD="CRTLIB LIB(${TARGETLIB}) TEXT('ZLIB: Data compression API')"
-        system "${CMD}"
-fi
-
-
-#       Create the DOCS source file if it does not exist.
-
-if action_needed "${LIBIFSNAME}/DOCS.FILE"
-then    CMD="CRTSRCPF FILE(${TARGETLIB}/DOCS) RCDLEN(112)"
-        CMD="${CMD} CCSID(${TGTCCSID}) TEXT('Documentation texts')"
-        system "${CMD}"
-fi
-
-#       Copy some documentation files if needed.
-
-for TEXT in "${TOPDIR}/ChangeLog" "${TOPDIR}/FAQ"                       \
-    "${TOPDIR}/README" "${SCRIPTDIR}/README400"
-do      MEMBER="${LIBIFSNAME}/DOCS.FILE/`db2_name \"${TEXT}\"`.MBR"
-
-        if action_needed "${MEMBER}" "${TEXT}"
-        then    CMD="CPY OBJ('${TEXT}') TOOBJ('${MEMBER}') TOCCSID(${TGTCCSID})"
-                CMD="${CMD} DTAFMT(*TEXT) REPLACE(*YES)"
-                system "${CMD}"
-        fi
-done
-
-
-#       Create the OS/400 source program file for the C header files.
-
-SRCPF="${LIBIFSNAME}/H.FILE"
-
-if action_needed "${SRCPF}"
-then    CMD="CRTSRCPF FILE(${TARGETLIB}/H) RCDLEN(112)"
-        CMD="${CMD} CCSID(${TGTCCSID}) TEXT('ZLIB: C/C++ header files')"
-        system "${CMD}"
-fi
-
-
-#       Create the IFS directory for the C header files.
-
-if action_needed "${IFSDIR}/include"
-then    mkdir -p "${IFSDIR}/include"
-fi
-
-#       Copy the header files to DB2 library. Link from IFS include directory.
-
-for HFILE in "${TOPDIR}/"*.h
-do      DEST="${SRCPF}/`db2_name \"${HFILE}\"`.MBR"
-
-        if action_needed "${DEST}" "${HFILE}"
-        then    copy_hfile < "${HFILE}" > tmphdrfile
-
-                #       Need to translate to target CCSID.
-
-                CMD="CPY OBJ('`pwd`/tmphdrfile') TOOBJ('${DEST}')"
-                CMD="${CMD} TOCCSID(${TGTCCSID}) DTAFMT(*TEXT) REPLACE(*YES)"
-                system "${CMD}"
-                # touch -r "${HFILE}" "${DEST}"
-                rm -f tmphdrfile
-        fi
-
-        IFSFILE="${IFSDIR}/include/`basename \"${HFILE}\"`"
-
-        if action_needed "${IFSFILE}" "${DEST}"
-        then    rm -f "${IFSFILE}"
-                ln -s "${DEST}" "${IFSFILE}"
-        fi
-done
-
-
-#       Install the ILE/RPG header file.
-
-
-HFILE="${SCRIPTDIR}/zlib.inc"
-DEST="${SRCPF}/ZLIB.INC.MBR"
-
-if action_needed "${DEST}" "${HFILE}"
-then    CMD="CPY OBJ('${HFILE}') TOOBJ('${DEST}')"
-        CMD="${CMD} TOCCSID(${TGTCCSID}) DTAFMT(*TEXT) REPLACE(*YES)"
-        system "${CMD}"
-        # touch -r "${HFILE}" "${DEST}"
-fi
-
-IFSFILE="${IFSDIR}/include/`basename \"${HFILE}\"`"
-
-if action_needed "${IFSFILE}" "${DEST}"
-then    rm -f "${IFSFILE}"
-        ln -s "${DEST}" "${IFSFILE}"
-fi
-
-
-#      Create and compile the identification source file.
-
-echo '#pragma comment(user, "ZLIB version '"${VERSION}"'")' > os400.c
-echo '#pragma comment(user, __DATE__)' >> os400.c
-echo '#pragma comment(user, __TIME__)' >> os400.c
-echo '#pragma comment(copyright, "Copyright (C) 1995-2017 Jean-Loup Gailly, Mark Adler. OS/400 version by P. Monnerat.")' >> os400.c
-make_module     OS400           os400.c
-LINK=                           # No need to rebuild service program yet.
-MODULES=
-
-
-#       Get source list.
-
-CSOURCES=`sed -e '/<source name="/!d'                                   \
-    -e 's/.* name="\([^"]*\)".*/\1/' < treebuild.xml`
-
-#       Compile the sources into modules.
-
-for SRC in ${CSOURCES}
-do      MODULE=`db2_name "${SRC}"`
-        make_module "${MODULE}" "${SRC}"
-done
-
-
-#       If needed, (re)create the static binding directory.
-
-if action_needed "${LIBIFSNAME}/${STATBNDDIR}.BNDDIR"
-then    LINK=YES
-fi
-
-if [ "${LINK}" ]
-then    rm -rf "${LIBIFSNAME}/${STATBNDDIR}.BNDDIR"
-        CMD="CRTBNDDIR BNDDIR(${TARGETLIB}/${STATBNDDIR})"
-        CMD="${CMD} TEXT('ZLIB static binding directory')"
-        system "${CMD}"
-
-        for MODULE in ${MODULES}
-        do      CMD="ADDBNDDIRE BNDDIR(${TARGETLIB}/${STATBNDDIR})"
-                CMD="${CMD} OBJ((${TARGETLIB}/${MODULE} *MODULE))"
-                system "${CMD}"
-        done
-fi
-
-
-#       The exportation file for service program creation must be in a DB2
-#               source file, so make sure it exists.
-
-if action_needed "${LIBIFSNAME}/TOOLS.FILE"
-then    CMD="CRTSRCPF FILE(${TARGETLIB}/TOOLS) RCDLEN(112)"
-        CMD="${CMD} CCSID(${TGTCCSID}) TEXT('ZLIB: build tools')"
-        system "${CMD}"
-fi
-
-
-DEST="${LIBIFSNAME}/TOOLS.FILE/BNDSRC.MBR"
-
-if action_needed "${SCRIPTDIR}/bndsrc" "${DEST}"
-then    CMD="CPY OBJ('${SCRIPTDIR}/bndsrc') TOOBJ('${DEST}')"
-        CMD="${CMD} TOCCSID(${TGTCCSID}) DTAFMT(*TEXT) REPLACE(*YES)"
-        system "${CMD}"
-        # touch -r "${SCRIPTDIR}/bndsrc" "${DEST}"
-        LINK=YES
-fi
-
-
-#       Build the service program if needed.
-
-if action_needed "${LIBIFSNAME}/${SRVPGM}.SRVPGM"
-then    LINK=YES
-fi
-
-if [ "${LINK}" ]
-then    CMD="CRTSRVPGM SRVPGM(${TARGETLIB}/${SRVPGM})"
-        CMD="${CMD} SRCFILE(${TARGETLIB}/TOOLS) SRCMBR(BNDSRC)"
-        CMD="${CMD} MODULE(${TARGETLIB}/OS400)"
-        CMD="${CMD} BNDDIR(${TARGETLIB}/${STATBNDDIR})"
-        CMD="${CMD} TEXT('ZLIB ${VERSION} dynamic library')"
-        CMD="${CMD} TGTRLS(${TGTRLS})"
-        system "${CMD}"
-        LINK=YES
-
-        #       Duplicate the service program for a versioned backup.
-
-        BACKUP=`echo "${SRVPGM}${VERSION}"                              |
-                sed -e 's/.*\(..........\)$/\1/' -e 's/\./_/g'`
-        BACKUP="`db2_name \"${BACKUP}\"`"
-        BKUPIFSNAME="${LIBIFSNAME}/${BACKUP}.SRVPGM"
-        rm -f "${BKUPIFSNAME}"
-        CMD="CRTDUPOBJ OBJ(${SRVPGM}) FROMLIB(${TARGETLIB})"
-        CMD="${CMD} OBJTYPE(*SRVPGM) NEWOBJ(${BACKUP})"
-        system "${CMD}"
-fi
-
-
-#       If needed, (re)create the dynamic binding directory.
-
-if action_needed "${LIBIFSNAME}/${DYNBNDDIR}.BNDDIR"
-then    LINK=YES
-fi
-
-if [ "${LINK}" ]
-then    rm -rf "${LIBIFSNAME}/${DYNBNDDIR}.BNDDIR"
-        CMD="CRTBNDDIR BNDDIR(${TARGETLIB}/${DYNBNDDIR})"
-        CMD="${CMD} TEXT('ZLIB dynamic binding directory')"
-        system "${CMD}"
-        CMD="ADDBNDDIRE BNDDIR(${TARGETLIB}/${DYNBNDDIR})"
-        CMD="${CMD} OBJ((*LIBL/${SRVPGM} *SRVPGM))"
-        system "${CMD}"
-fi
diff --git a/src/png/zlib/os400/zlib.inc b/src/png/zlib/os400/zlib.inc
deleted file mode 100644
index c6aca2cbd..000000000
--- a/src/png/zlib/os400/zlib.inc
+++ /dev/null
@@ -1,527 +0,0 @@
-      *  ZLIB.INC - Interface to the general purpose compression library
-      *
-      *  ILE RPG400 version by Patrick Monnerat, DATASPHERE.
-      *  Version 1.2.11
-      *
-      *
-      *  WARNING:
-      *     Procedures inflateInit(), inflateInit2(), deflateInit(),
-      *         deflateInit2() and inflateBackInit() need to be called with
-      *         two additional arguments:
-      *         the package version string and the stream control structure.
-      *         size. This is needed because RPG lacks some macro feature.
-      *         Call these procedures as:
-      *             inflateInit(...: ZLIB_VERSION: %size(z_stream))
-      *
-      /if not defined(ZLIB_H_)
-      /define ZLIB_H_
-      *
-      **************************************************************************
-      *                               Constants
-      **************************************************************************
-      *
-      *  Versioning information.
-      *
-     D ZLIB_VERSION    C                   '1.2.11'
-     D ZLIB_VERNUM     C                   X'12a0'
-     D ZLIB_VER_MAJOR  C                   1
-     D ZLIB_VER_MINOR  C                   2
-     D ZLIB_VER_REVISION...
-     D                 C                   11
-     D ZLIB_VER_SUBREVISION...
-     D                 C                   0
-      *
-      *  Other equates.
-      *
-     D Z_NO_FLUSH      C                   0
-     D Z_PARTIAL_FLUSH...
-     D                 C                   1
-     D Z_SYNC_FLUSH    C                   2
-     D Z_FULL_FLUSH    C                   3
-     D Z_FINISH        C                   4
-     D Z_BLOCK         C                   5
-     D Z_TREES         C                   6
-      *
-     D Z_OK            C                   0
-     D Z_STREAM_END    C                   1
-     D Z_NEED_DICT     C                   2
-     D Z_ERRNO         C                   -1
-     D Z_STREAM_ERROR  C                   -2
-     D Z_DATA_ERROR    C                   -3
-     D Z_MEM_ERROR     C                   -4
-     D Z_BUF_ERROR     C                   -5
-     D Z_VERSION_ERROR C                   -6
-      *
-     D Z_NO_COMPRESSION...
-     D                 C                   0
-     D Z_BEST_SPEED    C                   1
-     D Z_BEST_COMPRESSION...
-     D                 C                   9
-     D Z_DEFAULT_COMPRESSION...
-     D                 C                   -1
-      *
-     D Z_FILTERED      C                   1
-     D Z_HUFFMAN_ONLY  C                   2
-     D Z_RLE           C                   3
-     D Z_DEFAULT_STRATEGY...
-     D                 C                   0
-      *
-     D Z_BINARY        C                   0
-     D Z_ASCII         C                   1
-     D Z_UNKNOWN       C                   2
-      *
-     D Z_DEFLATED      C                   8
-      *
-     D Z_NULL          C                   0
-      *
-      **************************************************************************
-      *                                 Types
-      **************************************************************************
-      *
-     D z_streamp       S               *                                        Stream struct ptr
-     D gzFile          S               *                                        File pointer
-     D gz_headerp      S               *
-     D z_off_t         S             10i 0                                      Stream offsets
-     D z_off64_t       S             20i 0                                      Stream offsets
-      *
-      **************************************************************************
-      *                               Structures
-      **************************************************************************
-      *
-      *  The GZIP encode/decode stream support structure.
-      *
-     D z_stream        DS                  align based(z_streamp)
-     D  zs_next_in                     *                                        Next input byte
-     D  zs_avail_in                  10U 0                                      Byte cnt at next_in
-     D  zs_total_in                  10U 0                                      Total bytes read
-     D  zs_next_out                    *                                        Output buffer ptr
-     D  zs_avail_out                 10U 0                                      Room left @ next_out
-     D  zs_total_out                 10U 0                                      Total bytes written
-     D  zs_msg                         *                                        Last errmsg or null
-     D  zs_state                       *                                        Internal state
-     D  zs_zalloc                      *   procptr                              Int. state allocator
-     D  zs_free                        *   procptr                              Int. state dealloc.
-     D  zs_opaque                      *                                        Private alloc. data
-     D  zs_data_type                 10i 0                                      ASC/BIN best guess
-     D  zs_adler                     10u 0                                      Uncompr. adler32 val
-     D                               10U 0                                      Reserved
-     D                               10U 0                                      Ptr. alignment
-      *
-      **************************************************************************
-      *                     Utility function prototypes
-      **************************************************************************
-      *
-     D compress        PR            10I 0 extproc('compress')
-     D  dest                      65535    options(*varsize)                    Destination buffer
-     D  destLen                      10U 0                                      Destination length
-     D  source                    65535    const options(*varsize)              Source buffer
-     D  sourceLen                    10u 0 value                                Source length
-      *
-     D compress2       PR            10I 0 extproc('compress2')
-     D  dest                      65535    options(*varsize)                    Destination buffer
-     D  destLen                      10U 0                                      Destination length
-     D  source                    65535    const options(*varsize)              Source buffer
-     D  sourceLen                    10U 0 value                                Source length
-     D  level                        10I 0 value                                Compression level
-      *
-     D compressBound   PR            10U 0 extproc('compressBound')
-     D  sourceLen                    10U 0 value
-      *
-     D uncompress      PR            10I 0 extproc('uncompress')
-     D  dest                      65535    options(*varsize)                    Destination buffer
-     D  destLen                      10U 0                                      Destination length
-     D  source                    65535    const options(*varsize)              Source buffer
-     D  sourceLen                    10U 0 value                                Source length
-      *
-     D uncompress2     PR            10I 0 extproc('uncompress2')
-     D  dest                      65535    options(*varsize)                    Destination buffer
-     D  destLen                      10U 0                                      Destination length
-     D  source                    65535    const options(*varsize)              Source buffer
-     D  sourceLen                    10U 0                                      Source length
-      *
-      /if not defined(LARGE_FILES)
-     D gzopen          PR                  extproc('gzopen')
-     D                                     like(gzFile)
-     D  path                           *   value options(*string)               File pathname
-     D  mode                           *   value options(*string)               Open mode
-      /else
-     D gzopen          PR                  extproc('gzopen64')
-     D                                     like(gzFile)
-     D  path                           *   value options(*string)               File pathname
-     D  mode                           *   value options(*string)               Open mode
-      *
-     D gzopen64        PR                  extproc('gzopen64')
-     D                                     like(gzFile)
-     D  path                           *   value options(*string)               File pathname
-     D  mode                           *   value options(*string)               Open mode
-      /endif
-      *
-     D gzdopen         PR                  extproc('gzdopen')
-     D                                     like(gzFile)
-     D  fd                           10I 0 value                                File descriptor
-     D  mode                           *   value options(*string)               Open mode
-      *
-     D gzbuffer        PR            10I 0 extproc('gzbuffer')
-     D  file                               value like(gzFile)                   File pointer
-     D  size                         10U 0 value
-      *
-     D gzsetparams     PR            10I 0 extproc('gzsetparams')
-     D  file                               value like(gzFile)                   File pointer
-     D  level                        10I 0 value
-     D  strategy                     10I 0 value
-      *
-     D gzread          PR            10I 0 extproc('gzread')
-     D  file                               value like(gzFile)                   File pointer
-     D  buf                       65535    options(*varsize)                    Buffer
-     D  len                          10u 0 value                                Buffer length
-      *
-     D gzfread          PR           20I 0 extproc('gzfread')
-     D  buf                       65535    options(*varsize)                    Buffer
-     D  size                         20u 0 value                                Buffer length
-     D  nitems                       20u 0 value                                Buffer length
-     D  file                               value like(gzFile)                   File pointer
-      *
-     D gzwrite         PR            10I 0 extproc('gzwrite')
-     D  file                               value like(gzFile)                   File pointer
-     D  buf                       65535    const options(*varsize)              Buffer
-     D  len                          10u 0 value                                Buffer length
-      *
-     D gzfwrite         PR           20I 0 extproc('gzfwrite')
-     D  buf                       65535    options(*varsize)                    Buffer
-     D  size                         20u 0 value                                Buffer length
-     D  nitems                       20u 0 value                                Buffer length
-     D  file                               value like(gzFile)                   File pointer
-      *
-     D gzputs          PR            10I 0 extproc('gzputs')
-     D  file                               value like(gzFile)                   File pointer
-     D  s                              *   value options(*string)               String to output
-      *
-     D gzgets          PR              *   extproc('gzgets')
-     D  file                               value like(gzFile)                   File pointer
-     D  buf                       65535    options(*varsize)                    Read buffer
-     D  len                          10i 0 value                                Buffer length
-      *
-     D gzputc          PR            10i 0 extproc('gzputc')
-     D  file                               value like(gzFile)                   File pointer
-     D  c                            10I 0 value                                Character to write
-      *
-     D gzgetc          PR            10i 0 extproc('gzgetc')
-     D  file                               value like(gzFile)                   File pointer
-      *
-     D gzgetc_         PR            10i 0 extproc('gzgetc_')
-     D  file                               value like(gzFile)                   File pointer
-      *
-     D gzungetc        PR            10i 0 extproc('gzungetc')
-     D  c                            10I 0 value                                Character to push
-     D  file                               value like(gzFile)                   File pointer
-      *
-     D gzflush         PR            10i 0 extproc('gzflush')
-     D  file                               value like(gzFile)                   File pointer
-     D  flush                        10I 0 value                                Type of flush
-      *
-      /if not defined(LARGE_FILES)
-     D gzseek          PR                  extproc('gzseek')
-     D                                     like(z_off_t)
-     D  file                               value like(gzFile)                   File pointer
-     D  offset                             value like(z_off_t)                  Offset
-     D  whence                       10i 0 value                                Origin
-      /else
-     D gzseek          PR                  extproc('gzseek64')
-     D                                     like(z_off_t)
-     D  file                               value like(gzFile)                   File pointer
-     D  offset                             value like(z_off_t)                  Offset
-     D  whence                       10i 0 value                                Origin
-      *
-     D gzseek64        PR                  extproc('gzseek64')
-     D                                     like(z_off64_t)
-     D  file                               value like(gzFile)                   File pointer
-     D  offset                             value like(z_off64_t)                Offset
-     D  whence                       10i 0 value                                Origin
-      /endif
-      *
-     D gzrewind        PR            10i 0 extproc('gzrewind')
-     D  file                               value like(gzFile)                   File pointer
-      *
-      /if not defined(LARGE_FILES)
-     D gztell          PR                  extproc('gztell')
-     D                                     like(z_off_t)
-     D  file                               value like(gzFile)                   File pointer
-      /else
-     D gztell          PR                  extproc('gztell64')
-     D                                     like(z_off_t)
-     D  file                               value like(gzFile)                   File pointer
-      *
-     D gztell64        PR                  extproc('gztell64')
-     D                                     like(z_off64_t)
-     D  file                               value like(gzFile)                   File pointer
-      /endif
-      *
-      /if not defined(LARGE_FILES)
-     D gzoffset        PR                  extproc('gzoffset')
-     D                                     like(z_off_t)
-     D  file                               value like(gzFile)                   File pointer
-      /else
-     D gzoffset        PR                  extproc('gzoffset64')
-     D                                     like(z_off_t)
-     D  file                               value like(gzFile)                   File pointer
-      *
-     D gzoffset64      PR                  extproc('gzoffset64')
-     D                                     like(z_off64_t)
-     D  file                               value like(gzFile)                   File pointer
-      /endif
-      *
-     D gzeof           PR            10i 0 extproc('gzeof')
-     D  file                               value like(gzFile)                   File pointer
-      *
-     D gzdirect        PR            10i 0 extproc('gzdirect')
-     D  file                               value like(gzFile)                   File pointer
-      *
-     D gzclose_r       PR            10i 0 extproc('gzclose_r')
-     D  file                               value like(gzFile)                   File pointer
-      *
-     D gzclose_w       PR            10i 0 extproc('gzclose_w')
-     D  file                               value like(gzFile)                   File pointer
-      *
-     D gzclose         PR            10i 0 extproc('gzclose')
-     D  file                               value like(gzFile)                   File pointer
-      *
-     D gzerror         PR              *   extproc('gzerror')                   Error string
-     D  file                               value like(gzFile)                   File pointer
-     D  errnum                       10I 0                                      Error code
-      *
-     D gzclearerr      PR                  extproc('gzclearerr')
-     D  file                               value like(gzFile)                   File pointer
-      *
-      **************************************************************************
-      *                        Basic function prototypes
-      **************************************************************************
-      *
-     D zlibVersion     PR              *   extproc('zlibVersion')               Version string
-      *
-     D deflateInit     PR            10I 0 extproc('deflateInit_')              Init. compression
-     D  strm                               like(z_stream)                       Compression stream
-     D  level                        10I 0 value                                Compression level
-     D  version                        *   value options(*string)               Version string
-     D  stream_size                  10i 0 value                                Stream struct. size
-      *
-     D deflate         PR            10I 0 extproc('deflate')                   Compress data
-     D  strm                               like(z_stream)                       Compression stream
-     D  flush                        10I 0 value                                Flush type required
-      *
-     D deflateEnd      PR            10I 0 extproc('deflateEnd')                Termin. compression
-     D  strm                               like(z_stream)                       Compression stream
-      *
-     D inflateInit     PR            10I 0 extproc('inflateInit_')              Init. expansion
-     D  strm                               like(z_stream)                       Expansion stream
-     D  version                        *   value options(*string)               Version string
-     D  stream_size                  10i 0 value                                Stream struct. size
-      *
-     D inflate         PR            10I 0 extproc('inflate')                   Expand data
-     D  strm                               like(z_stream)                       Expansion stream
-     D  flush                        10I 0 value                                Flush type required
-      *
-     D inflateEnd      PR            10I 0 extproc('inflateEnd')                Termin. expansion
-     D  strm                               like(z_stream)                       Expansion stream
-      *
-      **************************************************************************
-      *                        Advanced function prototypes
-      **************************************************************************
-      *
-     D deflateInit2    PR            10I 0 extproc('deflateInit2_')             Init. compression
-     D  strm                               like(z_stream)                       Compression stream
-     D  level                        10I 0 value                                Compression level
-     D  method                       10I 0 value                                Compression method
-     D  windowBits                   10I 0 value                                log2(window size)
-     D  memLevel                     10I 0 value                                Mem/cmpress tradeoff
-     D  strategy                     10I 0 value                                Compression strategy
-     D  version                        *   value options(*string)               Version string
-     D  stream_size                  10i 0 value                                Stream struct. size
-      *
-     D deflateSetDictionary...
-     D                 PR            10I 0 extproc('deflateSetDictionary')      Init. dictionary
-     D  strm                               like(z_stream)                       Compression stream
-     D  dictionary                65535    const options(*varsize)              Dictionary bytes
-     D  dictLength                   10U 0 value                                Dictionary length
-      *
-     D deflateCopy     PR            10I 0 extproc('deflateCopy')               Compress strm 2 strm
-     D  dest                               like(z_stream)                       Destination stream
-     D  source                             like(z_stream)                       Source stream
-      *
-     D deflateReset    PR            10I 0 extproc('deflateReset')              End and init. stream
-     D  strm                               like(z_stream)                       Compression stream
-      *
-     D deflateParams   PR            10I 0 extproc('deflateParams')             Change level & strat
-     D  strm                               like(z_stream)                       Compression stream
-     D  level                        10I 0 value                                Compression level
-     D  strategy                     10I 0 value                                Compression strategy
-      *
-     D deflateTune     PR            10I 0 extproc('deflateTune')
-     D  strm                               like(z_stream)                       Compression stream
-     D  good                         10I 0 value
-     D  lazy                         10I 0 value
-     D  nice                         10I 0 value
-     D  chain                        10I 0 value
-      *
-     D deflateBound    PR            10U 0 extproc('deflateBound')              Change level & strat
-     D  strm                               like(z_stream)                       Compression stream
-     D  sourcelen                    10U 0 value                                Compression level
-      *
-     D deflatePending  PR            10I 0 extproc('deflatePending')            Change level & strat
-     D  strm                               like(z_stream)                       Compression stream
-     D  pending                      10U 0                                      Pending bytes
-     D  bits                         10I 0                                      Pending bits
-      *
-     D deflatePrime    PR            10I 0 extproc('deflatePrime')              Change level & strat
-     D  strm                               like(z_stream)                       Compression stream
-     D  bits                         10I 0 value                                # of bits to insert
-     D  value                        10I 0 value                                Bits to insert
-      *
-     D inflateInit2    PR            10I 0 extproc('inflateInit2_')             Init. expansion
-     D  strm                               like(z_stream)                       Expansion stream
-     D  windowBits                   10I 0 value                                log2(window size)
-     D  version                        *   value options(*string)               Version string
-     D  stream_size                  10i 0 value                                Stream struct. size
-      *
-     D inflateSetDictionary...
-     D                 PR            10I 0 extproc('inflateSetDictionary')      Init. dictionary
-     D  strm                               like(z_stream)                       Expansion stream
-     D  dictionary                65535    const options(*varsize)              Dictionary bytes
-     D  dictLength                   10U 0 value                                Dictionary length
-      *
-     D inflateGetDictionary...
-     D                 PR            10I 0 extproc('inflateGetDictionary')      Get dictionary
-     D  strm                               like(z_stream)                       Expansion stream
-     D  dictionary                65535    options(*varsize)                    Dictionary bytes
-     D  dictLength                   10U 0                                      Dictionary length
-      *
-     D deflateGetDictionary...
-     D                 PR            10I 0 extproc('deflateGetDictionary')      Get dictionary
-     D  strm                               like(z_stream)                       Expansion stream
-     D  dictionary                65535    options(*varsize)                    Dictionary bytes
-     D  dictLength                   10U 0                                      Dictionary length
-      *
-     D inflateSync     PR            10I 0 extproc('inflateSync')               Sync. expansion
-     D  strm                               like(z_stream)                       Expansion stream
-      *
-     D inflateCopy     PR            10I 0 extproc('inflateCopy')
-     D  dest                               like(z_stream)                       Destination stream
-     D  source                             like(z_stream)                       Source stream
-      *
-     D inflateReset    PR            10I 0 extproc('inflateReset')              End and init. stream
-     D  strm                               like(z_stream)                       Expansion stream
-      *
-     D inflateReset2   PR            10I 0 extproc('inflateReset2')             End and init. stream
-     D  strm                               like(z_stream)                       Expansion stream
-     D  windowBits                   10I 0 value                                Log2(buffer size)
-      *
-     D inflatePrime    PR            10I 0 extproc('inflatePrime')              Insert bits
-     D  strm                               like(z_stream)                       Expansion stream
-     D  bits                         10I 0 value                                Bit count
-     D  value                        10I 0 value                                Bits to insert
-      *
-     D inflateMark     PR            10I 0 extproc('inflateMark')               Get inflate info
-     D  strm                               like(z_stream)                       Expansion stream
-      *
-     D inflateCodesUsed...
-                       PR            20U 0 extproc('inflateCodesUsed')
-     D  strm                               like(z_stream)                       Expansion stream
-      *
-     D inflateValidate...
-                       PR            20U 0 extproc('inflateValidate')
-     D  strm                               like(z_stream)                       Expansion stream
-     D  check                        10I 0 value
-      *
-     D inflateGetHeader...
-                       PR            10U 0 extproc('inflateGetHeader')
-     D  strm                               like(z_stream)                       Expansion stream
-     D  head                               like(gz_headerp)
-      *
-     D deflateSetHeader...
-                       PR            10U 0 extproc('deflateSetHeader')
-     D  strm                               like(z_stream)                       Expansion stream
-     D  head                               like(gz_headerp)
-      *
-     D inflateBackInit...
-     D                 PR            10I 0 extproc('inflateBackInit_')
-     D  strm                               like(z_stream)                       Expansion stream
-     D  windowBits                   10I 0 value                                Log2(buffer size)
-     D  window                    65535    options(*varsize)                    Buffer
-     D  version                        *   value options(*string)               Version string
-     D  stream_size                  10i 0 value                                Stream struct. size
-      *
-     D inflateBack     PR            10I 0 extproc('inflateBack')
-     D  strm                               like(z_stream)                       Expansion stream
-     D  in                             *   value procptr                        Input function
-     D  in_desc                        *   value                                Input descriptor
-     D  out                            *   value procptr                        Output function
-     D  out_desc                       *   value                                Output descriptor
-      *
-     D inflateBackEnd  PR            10I 0 extproc('inflateBackEnd')
-     D  strm                               like(z_stream)                       Expansion stream
-      *
-     D zlibCompileFlags...
-     D                 PR            10U 0 extproc('zlibCompileFlags')
-      *
-      **************************************************************************
-      *                        Checksum function prototypes
-      **************************************************************************
-      *
-     D adler32         PR            10U 0 extproc('adler32')                   New checksum
-     D  adler                        10U 0 value                                Old checksum
-     D  buf                       65535    const options(*varsize)              Bytes to accumulate
-     D  len                          10U 0 value                                Buffer length
-      *
-     D adler32_combine...
-                       PR            10U 0 extproc('adler32_combine')           New checksum
-     D  adler1                       10U 0 value                                Old checksum
-     D  adler2                       10U 0 value                                Old checksum
-     D  len2                         20U 0 value                                Buffer length
-      *
-     D adler32_z       PR            10U 0 extproc('adler32_z')                 New checksum
-     D  adler                        10U 0 value                                Old checksum
-     D  buf                       65535    const options(*varsize)              Bytes to accumulate
-     D  len                          20U 0 value                                Buffer length
-      *
-     D crc32           PR            10U 0 extproc('crc32')                     New checksum
-     D  crc                          10U 0 value                                Old checksum
-     D  buf                       65535    const options(*varsize)              Bytes to accumulate
-     D  len                          10U 0 value                                Buffer length
-      *
-     D crc32_combine...
-                       PR            10U 0 extproc('crc32_combine')             New checksum
-     D  crc1                         10U 0 value                                Old checksum
-     D  crc2                         10U 0 value                                Old checksum
-     D  len2                         20U 0 value                                Buffer length
-      *
-     D crc32_z         PR            10U 0 extproc('crc32_z')                   New checksum
-     D  crc                          10U 0 value                                Old checksum
-     D  buf                       65535    const options(*varsize)              Bytes to accumulate
-     D  len                          20U 0 value                                Buffer length
-      *
-      **************************************************************************
-      *                     Miscellaneous function prototypes
-      **************************************************************************
-      *
-     D zError          PR              *   extproc('zError')                    Error string
-     D  err                          10I 0 value                                Error code
-      *
-     D inflateSyncPoint...
-     D                 PR            10I 0 extproc('inflateSyncPoint')
-     D  strm                               like(z_stream)                       Expansion stream
-      *
-     D get_crc_table   PR              *   extproc('get_crc_table')             Ptr to ulongs
-      *
-     D inflateUndermine...
-     D                 PR            10I 0 extproc('inflateUndermine')
-     D  strm                               like(z_stream)                       Expansion stream
-     D  arg                          10I 0 value                                Error code
-      *
-     D inflateResetKeep...
-     D                 PR            10I 0 extproc('inflateResetKeep')          End and init. stream
-     D  strm                               like(z_stream)                       Expansion stream
-      *
-     D deflateResetKeep...
-     D                 PR            10I 0 extproc('deflateResetKeep')          End and init. stream
-     D  strm                               like(z_stream)                       Expansion stream
-      *
-      /endif
diff --git a/src/png/zlib/qnx/package.qpg b/src/png/zlib/qnx/package.qpg
deleted file mode 100644
index 31e8e90db..000000000
--- a/src/png/zlib/qnx/package.qpg
+++ /dev/null
@@ -1,141 +0,0 @@
-<QPG:Generation>
-   <QPG:Options>
-      <QPG:User unattended="no" verbosity="2" listfiles="yes"/>
-      <QPG:Defaults type="qnx_package"/>
-      <QPG:Source></QPG:Source>
-      <QPG:Release number="+"/>
-      <QPG:Build></QPG:Build>
-      <QPG:FileSorting strip="yes"/>
-      <QPG:Package targets="combine"/>
-      <QPG:Repository generate="yes"/>
-      <QPG:FinalDir></QPG:FinalDir>
-      <QPG:Cleanup></QPG:Cleanup>
-   </QPG:Options>
-
-   <QPG:Responsible>
-      <QPG:Company></QPG:Company>
-      <QPG:Department></QPG:Department>
-      <QPG:Group></QPG:Group>
-      <QPG:Team></QPG:Team>
-      <QPG:Employee></QPG:Employee>
-      <QPG:EmailAddress></QPG:EmailAddress>
-   </QPG:Responsible>
-
-   <QPG:Values>
-      <QPG:Files>
-         <QPG:Add file="../zconf.h" install="/opt/include/" user="root:sys" permission="644"/>
-         <QPG:Add file="../zlib.h" install="/opt/include/" user="root:sys" permission="644"/>
-         <QPG:Add file="../libz.so.1.2.11" install="/opt/lib/" user="root:bin" permission="644"/>
-         <QPG:Add file="libz.so" install="/opt/lib/" component="dev" filetype="symlink" linkto="libz.so.1.2.11"/>
-         <QPG:Add file="libz.so.1" install="/opt/lib/" filetype="symlink" linkto="libz.so.1.2.11"/>
-         <QPG:Add file="../libz.so.1.2.11" install="/opt/lib/" component="slib"/>
-      </QPG:Files>
-
-      <QPG:PackageFilter>
-         <QPM:PackageManifest>
-            <QPM:PackageDescription>
-               <QPM:PackageType>Library</QPM:PackageType>
-               <QPM:PackageReleaseNotes></QPM:PackageReleaseNotes>
-               <QPM:PackageReleaseUrgency>Medium</QPM:PackageReleaseUrgency>
-               <QPM:PackageRepository></QPM:PackageRepository>
-               <QPM:FileVersion>2.0</QPM:FileVersion>
-            </QPM:PackageDescription>
-
-            <QPM:ProductDescription>
-               <QPM:ProductName>zlib</QPM:ProductName>
-               <QPM:ProductIdentifier>zlib</QPM:ProductIdentifier>
-               <QPM:ProductEmail>alain.bonnefoy@icbt.com</QPM:ProductEmail>
-               <QPM:VendorName>Public</QPM:VendorName>
-               <QPM:VendorInstallName>public</QPM:VendorInstallName>
-               <QPM:VendorURL>www.gzip.org/zlib</QPM:VendorURL>
-               <QPM:VendorEmbedURL></QPM:VendorEmbedURL>
-               <QPM:VendorEmail></QPM:VendorEmail>
-               <QPM:AuthorName>Jean-Loup Gailly,Mark Adler</QPM:AuthorName>
-               <QPM:AuthorURL>www.gzip.org/zlib</QPM:AuthorURL>
-               <QPM:AuthorEmbedURL></QPM:AuthorEmbedURL>
-               <QPM:AuthorEmail>zlib@gzip.org</QPM:AuthorEmail>
-               <QPM:ProductIconSmall></QPM:ProductIconSmall>
-               <QPM:ProductIconLarge></QPM:ProductIconLarge>
-               <QPM:ProductDescriptionShort>A massively spiffy yet delicately unobtrusive compression library.</QPM:ProductDescriptionShort>
-               <QPM:ProductDescriptionLong>zlib is designed to be a free, general-purpose, legally unencumbered, lossless data compression library for use on virtually any computer hardware and operating system.</QPM:ProductDescriptionLong>
-               <QPM:ProductDescriptionURL>http://www.gzip.org/zlib</QPM:ProductDescriptionURL>
-               <QPM:ProductDescriptionEmbedURL></QPM:ProductDescriptionEmbedURL>
-            </QPM:ProductDescription>
-
-            <QPM:ReleaseDescription>
-               <QPM:ReleaseVersion>1.2.11</QPM:ReleaseVersion>
-               <QPM:ReleaseUrgency>Medium</QPM:ReleaseUrgency>
-               <QPM:ReleaseStability>Stable</QPM:ReleaseStability>
-               <QPM:ReleaseNoteMinor></QPM:ReleaseNoteMinor>
-               <QPM:ReleaseNoteMajor></QPM:ReleaseNoteMajor>
-               <QPM:ExcludeCountries>
-                  <QPM:Country></QPM:Country>
-               </QPM:ExcludeCountries>
-
-               <QPM:ReleaseCopyright>No License</QPM:ReleaseCopyright>
-            </QPM:ReleaseDescription>
-
-            <QPM:ContentDescription>
-               <QPM:ContentTopic xmlmultiple="true">Software Development/Libraries and Extensions/C Libraries</QPM:ContentTopic>
-               <QPM:ContentKeyword>zlib,compression</QPM:ContentKeyword>
-               <QPM:TargetOS>qnx6</QPM:TargetOS>
-               <QPM:HostOS>qnx6</QPM:HostOS>
-               <QPM:DisplayEnvironment xmlmultiple="true">None</QPM:DisplayEnvironment>
-               <QPM:TargetAudience xmlmultiple="true">Developer</QPM:TargetAudience>
-            </QPM:ContentDescription>
-         </QPM:PackageManifest>
-      </QPG:PackageFilter>
-
-      <QPG:PackageFilter proc="none" target="none">
-         <QPM:PackageManifest>
-            <QPM:ProductInstallationDependencies>
-               <QPM:ProductRequirements></QPM:ProductRequirements>
-            </QPM:ProductInstallationDependencies>
-
-            <QPM:ProductInstallationProcedure>
-               <QPM:Script xmlmultiple="true">
-                  <QPM:ScriptName></QPM:ScriptName>
-                  <QPM:ScriptType>Install</QPM:ScriptType>
-                  <QPM:ScriptTiming>Post</QPM:ScriptTiming>
-                  <QPM:ScriptBlocking>No</QPM:ScriptBlocking>
-                  <QPM:ScriptResult>Ignore</QPM:ScriptResult>
-                  <QPM:ShortDescription></QPM:ShortDescription>
-                  <QPM:UseBinaries>No</QPM:UseBinaries>
-                  <QPM:Priority>Optional</QPM:Priority>
-               </QPM:Script>
-            </QPM:ProductInstallationProcedure>
-         </QPM:PackageManifest>
-
-         <QPM:Launch>
-         </QPM:Launch>
-      </QPG:PackageFilter>
-
-      <QPG:PackageFilter type="core" component="none">
-         <QPM:PackageManifest>
-            <QPM:ProductInstallationProcedure>
-	       <QPM:OrderDependency xmlmultiple="true">
-	          <QPM:Order>InstallOver</QPM:Order>
-	          <QPM:Product>zlib</QPM:Product>
-	       </QPM:OrderDependency>
-            </QPM:ProductInstallationProcedure>
-         </QPM:PackageManifest>
-
-         <QPM:Launch>
-         </QPM:Launch>
-      </QPG:PackageFilter>
-
-      <QPG:PackageFilter type="core" component="dev">
-         <QPM:PackageManifest>
-            <QPM:ProductInstallationProcedure>
-	       <QPM:OrderDependency xmlmultiple="true">
-	          <QPM:Order>InstallOver</QPM:Order>
-	          <QPM:Product>zlib-dev</QPM:Product>
-	       </QPM:OrderDependency>
-            </QPM:ProductInstallationProcedure>
-         </QPM:PackageManifest>
-
-         <QPM:Launch>
-         </QPM:Launch>
-      </QPG:PackageFilter>
-   </QPG:Values>
-</QPG:Generation>
diff --git a/src/png/zlib/treebuild.xml b/src/png/zlib/treebuild.xml
deleted file mode 100644
index fd75525f9..000000000
--- a/src/png/zlib/treebuild.xml
+++ /dev/null
@@ -1,116 +0,0 @@
-<?xml version="1.0" ?>
-<package name="zlib" version="1.2.11">
-    <library name="zlib" dlversion="1.2.11" dlname="z">
-	<property name="description"> zip compression library </property>
-	<property name="include-target-dir" value="$(@PACKAGE/install-includedir)" />
-
-	<!-- fixme: not implemented yet -->
-	<property name="compiler/c/inline" value="yes" />
-
-	<include-file name="zlib.h" scope="public" mode="644" />
-	<include-file name="zconf.h" scope="public" mode="644" />
-
-	<source name="adler32.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	</source>
-	<source name="compress.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	</source>
-	<source name="crc32.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	    <depend name="crc32.h" />
-	</source>
-	<source name="gzclose.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	    <depend name="gzguts.h" />
-	</source>
-	<source name="gzlib.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	    <depend name="gzguts.h" />
-	</source>
-	<source name="gzread.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	    <depend name="gzguts.h" />
-	</source>
-	<source name="gzwrite.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	    <depend name="gzguts.h" />
-	</source>
-	<source name="uncompr.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	</source>
-	<source name="deflate.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	    <depend name="zutil.h" />
-	    <depend name="deflate.h" />
-	</source>
-	<source name="trees.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	    <depend name="zutil.h" />
-	    <depend name="deflate.h" />
-	    <depend name="trees.h" />
-	</source>
-	<source name="zutil.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	    <depend name="zutil.h" />
-	</source>
-	<source name="inflate.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	    <depend name="zutil.h" />
-	    <depend name="inftrees.h" />
-	    <depend name="inflate.h" />
-	    <depend name="inffast.h" />
-	</source>
-	<source name="infback.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	    <depend name="zutil.h" />
-	    <depend name="inftrees.h" />
-	    <depend name="inflate.h" />
-	    <depend name="inffast.h" />
-	</source>
-	<source name="inftrees.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	    <depend name="zutil.h" />
-	    <depend name="inftrees.h" />
-	</source>
-	<source name="inffast.c">
-	    <depend name="zlib.h" />
-	    <depend name="zconf.h" />
-	    <depend name="zutil.h" />
-	    <depend name="inftrees.h" />
-	    <depend name="inflate.h" />
-	    <depend name="inffast.h" />
-	</source>
-    </library>
-</package>
-
-<!--
-CFLAGS=-O
-#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS=-g -DZLIB_DEBUG
-#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
-#           -Wstrict-prototypes -Wmissing-prototypes
-
-# OBJA =
-# to use the asm code: make OBJA=match.o
-#
-match.o: match.S
-	$(CPP) match.S > _match.s
-	$(CC) -c _match.s
-	mv _match.o match.o
-	rm -f _match.s
--->
diff --git a/src/png/zlib/trees.c b/src/png/zlib/trees.c
deleted file mode 100644
index 50cf4b457..000000000
--- a/src/png/zlib/trees.c
+++ /dev/null
@@ -1,1203 +0,0 @@
-/* trees.c -- output deflated data using Huffman coding
- * Copyright (C) 1995-2017 Jean-loup Gailly
- * detect_data_type() function provided freely by Cosmin Truta, 2006
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/*
- *  ALGORITHM
- *
- *      The "deflation" process uses several Huffman trees. The more
- *      common source values are represented by shorter bit sequences.
- *
- *      Each code tree is stored in a compressed form which is itself
- * a Huffman encoding of the lengths of all the code strings (in
- * ascending order by source values).  The actual code strings are
- * reconstructed from the lengths in the inflate process, as described
- * in the deflate specification.
- *
- *  REFERENCES
- *
- *      Deutsch, L.P.,"'Deflate' Compressed Data Format Specification".
- *      Available in ftp.uu.net:/pub/archiving/zip/doc/deflate-1.1.doc
- *
- *      Storer, James A.
- *          Data Compression:  Methods and Theory, pp. 49-50.
- *          Computer Science Press, 1988.  ISBN 0-7167-8156-5.
- *
- *      Sedgewick, R.
- *          Algorithms, p290.
- *          Addison-Wesley, 1983. ISBN 0-201-06672-6.
- */
-
-/* @(#) $Id$ */
-
-/* #define GEN_TREES_H */
-
-#include "deflate.h"
-
-#ifdef ZLIB_DEBUG
-#  include <ctype.h>
-#endif
-
-/* ===========================================================================
- * Constants
- */
-
-#define MAX_BL_BITS 7
-/* Bit length codes must not exceed MAX_BL_BITS bits */
-
-#define END_BLOCK 256
-/* end of block literal code */
-
-#define REP_3_6      16
-/* repeat previous bit length 3-6 times (2 bits of repeat count) */
-
-#define REPZ_3_10    17
-/* repeat a zero length 3-10 times  (3 bits of repeat count) */
-
-#define REPZ_11_138  18
-/* repeat a zero length 11-138 times  (7 bits of repeat count) */
-
-local const int extra_lbits[LENGTH_CODES] /* extra bits for each length code */
-   = {0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0};
-
-local const int extra_dbits[D_CODES] /* extra bits for each distance code */
-   = {0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
-
-local const int extra_blbits[BL_CODES]/* extra bits for each bit length code */
-   = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7};
-
-local const uch bl_order[BL_CODES]
-   = {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15};
-/* The lengths of the bit length codes are sent in order of decreasing
- * probability, to avoid transmitting the lengths for unused bit length codes.
- */
-
-/* ===========================================================================
- * Local data. These are initialized only once.
- */
-
-#define DIST_CODE_LEN  512 /* see definition of array dist_code below */
-
-#if defined(GEN_TREES_H) || !defined(STDC)
-/* non ANSI compilers may not accept trees.h */
-
-local ct_data static_ltree[L_CODES+2];
-/* The static literal tree. Since the bit lengths are imposed, there is no
- * need for the L_CODES extra codes used during heap construction. However
- * The codes 286 and 287 are needed to build a canonical tree (see _tr_init
- * below).
- */
-
-local ct_data static_dtree[D_CODES];
-/* The static distance tree. (Actually a trivial tree since all codes use
- * 5 bits.)
- */
-
-uch _dist_code[DIST_CODE_LEN];
-/* Distance codes. The first 256 values correspond to the distances
- * 3 .. 258, the last 256 values correspond to the top 8 bits of
- * the 15 bit distances.
- */
-
-uch _length_code[MAX_MATCH-MIN_MATCH+1];
-/* length code for each normalized match length (0 == MIN_MATCH) */
-
-local int base_length[LENGTH_CODES];
-/* First normalized length for each code (0 = MIN_MATCH) */
-
-local int base_dist[D_CODES];
-/* First normalized distance for each code (0 = distance of 1) */
-
-#else
-#  include "trees.h"
-#endif /* GEN_TREES_H */
-
-struct static_tree_desc_s {
-    const ct_data *static_tree;  /* static tree or NULL */
-    const intf *extra_bits;      /* extra bits for each code or NULL */
-    int     extra_base;          /* base index for extra_bits */
-    int     elems;               /* max number of elements in the tree */
-    int     max_length;          /* max bit length for the codes */
-};
-
-local const static_tree_desc  static_l_desc =
-{static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS};
-
-local const static_tree_desc  static_d_desc =
-{static_dtree, extra_dbits, 0,          D_CODES, MAX_BITS};
-
-local const static_tree_desc  static_bl_desc =
-{(const ct_data *)0, extra_blbits, 0,   BL_CODES, MAX_BL_BITS};
-
-/* ===========================================================================
- * Local (static) routines in this file.
- */
-
-local void tr_static_init OF((void));
-local void init_block     OF((deflate_state *s));
-local void pqdownheap     OF((deflate_state *s, ct_data *tree, int k));
-local void gen_bitlen     OF((deflate_state *s, tree_desc *desc));
-local void gen_codes      OF((ct_data *tree, int max_code, ushf *bl_count));
-local void build_tree     OF((deflate_state *s, tree_desc *desc));
-local void scan_tree      OF((deflate_state *s, ct_data *tree, int max_code));
-local void send_tree      OF((deflate_state *s, ct_data *tree, int max_code));
-local int  build_bl_tree  OF((deflate_state *s));
-local void send_all_trees OF((deflate_state *s, int lcodes, int dcodes,
-                              int blcodes));
-local void compress_block OF((deflate_state *s, const ct_data *ltree,
-                              const ct_data *dtree));
-local int  detect_data_type OF((deflate_state *s));
-local unsigned bi_reverse OF((unsigned value, int length));
-local void bi_windup      OF((deflate_state *s));
-local void bi_flush       OF((deflate_state *s));
-
-#ifdef GEN_TREES_H
-local void gen_trees_header OF((void));
-#endif
-
-#ifndef ZLIB_DEBUG
-#  define send_code(s, c, tree) send_bits(s, tree[c].Code, tree[c].Len)
-   /* Send a code of the given tree. c and tree must not have side effects */
-
-#else /* !ZLIB_DEBUG */
-#  define send_code(s, c, tree) \
-     { if (z_verbose>2) fprintf(stderr,"\ncd %3d ",(c)); \
-       send_bits(s, tree[c].Code, tree[c].Len); }
-#endif
-
-/* ===========================================================================
- * Output a short LSB first on the stream.
- * IN assertion: there is enough room in pendingBuf.
- */
-#define put_short(s, w) { \
-    put_byte(s, (uch)((w) & 0xff)); \
-    put_byte(s, (uch)((ush)(w) >> 8)); \
-}
-
-/* ===========================================================================
- * Send a value on a given number of bits.
- * IN assertion: length <= 16 and value fits in length bits.
- */
-#ifdef ZLIB_DEBUG
-local void send_bits      OF((deflate_state *s, int value, int length));
-
-local void send_bits(s, value, length)
-    deflate_state *s;
-    int value;  /* value to send */
-    int length; /* number of bits */
-{
-    Tracevv((stderr," l %2d v %4x ", length, value));
-    Assert(length > 0 && length <= 15, "invalid length");
-    s->bits_sent += (ulg)length;
-
-    /* If not enough room in bi_buf, use (valid) bits from bi_buf and
-     * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid))
-     * unused bits in value.
-     */
-    if (s->bi_valid > (int)Buf_size - length) {
-        s->bi_buf |= (ush)value << s->bi_valid;
-        put_short(s, s->bi_buf);
-        s->bi_buf = (ush)value >> (Buf_size - s->bi_valid);
-        s->bi_valid += length - Buf_size;
-    } else {
-        s->bi_buf |= (ush)value << s->bi_valid;
-        s->bi_valid += length;
-    }
-}
-#else /* !ZLIB_DEBUG */
-
-#define send_bits(s, value, length) \
-{ int len = length;\
-  if (s->bi_valid > (int)Buf_size - len) {\
-    int val = (int)value;\
-    s->bi_buf |= (ush)val << s->bi_valid;\
-    put_short(s, s->bi_buf);\
-    s->bi_buf = (ush)val >> (Buf_size - s->bi_valid);\
-    s->bi_valid += len - Buf_size;\
-  } else {\
-    s->bi_buf |= (ush)(value) << s->bi_valid;\
-    s->bi_valid += len;\
-  }\
-}
-#endif /* ZLIB_DEBUG */
-
-
-/* the arguments must not have side effects */
-
-/* ===========================================================================
- * Initialize the various 'constant' tables.
- */
-local void tr_static_init()
-{
-#if defined(GEN_TREES_H) || !defined(STDC)
-    static int static_init_done = 0;
-    int n;        /* iterates over tree elements */
-    int bits;     /* bit counter */
-    int length;   /* length value */
-    int code;     /* code value */
-    int dist;     /* distance index */
-    ush bl_count[MAX_BITS+1];
-    /* number of codes at each bit length for an optimal tree */
-
-    if (static_init_done) return;
-
-    /* For some embedded targets, global variables are not initialized: */
-#ifdef NO_INIT_GLOBAL_POINTERS
-    static_l_desc.static_tree = static_ltree;
-    static_l_desc.extra_bits = extra_lbits;
-    static_d_desc.static_tree = static_dtree;
-    static_d_desc.extra_bits = extra_dbits;
-    static_bl_desc.extra_bits = extra_blbits;
-#endif
-
-    /* Initialize the mapping length (0..255) -> length code (0..28) */
-    length = 0;
-    for (code = 0; code < LENGTH_CODES-1; code++) {
-        base_length[code] = length;
-        for (n = 0; n < (1<<extra_lbits[code]); n++) {
-            _length_code[length++] = (uch)code;
-        }
-    }
-    Assert (length == 256, "tr_static_init: length != 256");
-    /* Note that the length 255 (match length 258) can be represented
-     * in two different ways: code 284 + 5 bits or code 285, so we
-     * overwrite length_code[255] to use the best encoding:
-     */
-    _length_code[length-1] = (uch)code;
-
-    /* Initialize the mapping dist (0..32K) -> dist code (0..29) */
-    dist = 0;
-    for (code = 0 ; code < 16; code++) {
-        base_dist[code] = dist;
-        for (n = 0; n < (1<<extra_dbits[code]); n++) {
-            _dist_code[dist++] = (uch)code;
-        }
-    }
-    Assert (dist == 256, "tr_static_init: dist != 256");
-    dist >>= 7; /* from now on, all distances are divided by 128 */
-    for ( ; code < D_CODES; code++) {
-        base_dist[code] = dist << 7;
-        for (n = 0; n < (1<<(extra_dbits[code]-7)); n++) {
-            _dist_code[256 + dist++] = (uch)code;
-        }
-    }
-    Assert (dist == 256, "tr_static_init: 256+dist != 512");
-
-    /* Construct the codes of the static literal tree */
-    for (bits = 0; bits <= MAX_BITS; bits++) bl_count[bits] = 0;
-    n = 0;
-    while (n <= 143) static_ltree[n++].Len = 8, bl_count[8]++;
-    while (n <= 255) static_ltree[n++].Len = 9, bl_count[9]++;
-    while (n <= 279) static_ltree[n++].Len = 7, bl_count[7]++;
-    while (n <= 287) static_ltree[n++].Len = 8, bl_count[8]++;
-    /* Codes 286 and 287 do not exist, but we must include them in the
-     * tree construction to get a canonical Huffman tree (longest code
-     * all ones)
-     */
-    gen_codes((ct_data *)static_ltree, L_CODES+1, bl_count);
-
-    /* The static distance tree is trivial: */
-    for (n = 0; n < D_CODES; n++) {
-        static_dtree[n].Len = 5;
-        static_dtree[n].Code = bi_reverse((unsigned)n, 5);
-    }
-    static_init_done = 1;
-
-#  ifdef GEN_TREES_H
-    gen_trees_header();
-#  endif
-#endif /* defined(GEN_TREES_H) || !defined(STDC) */
-}
-
-/* ===========================================================================
- * Genererate the file trees.h describing the static trees.
- */
-#ifdef GEN_TREES_H
-#  ifndef ZLIB_DEBUG
-#    include <stdio.h>
-#  endif
-
-#  define SEPARATOR(i, last, width) \
-      ((i) == (last)? "\n};\n\n" :    \
-       ((i) % (width) == (width)-1 ? ",\n" : ", "))
-
-void gen_trees_header()
-{
-    FILE *header = fopen("trees.h", "w");
-    int i;
-
-    Assert (header != NULL, "Can't open trees.h");
-    fprintf(header,
-            "/* header created automatically with -DGEN_TREES_H */\n\n");
-
-    fprintf(header, "local const ct_data static_ltree[L_CODES+2] = {\n");
-    for (i = 0; i < L_CODES+2; i++) {
-        fprintf(header, "{{%3u},{%3u}}%s", static_ltree[i].Code,
-                static_ltree[i].Len, SEPARATOR(i, L_CODES+1, 5));
-    }
-
-    fprintf(header, "local const ct_data static_dtree[D_CODES] = {\n");
-    for (i = 0; i < D_CODES; i++) {
-        fprintf(header, "{{%2u},{%2u}}%s", static_dtree[i].Code,
-                static_dtree[i].Len, SEPARATOR(i, D_CODES-1, 5));
-    }
-
-    fprintf(header, "const uch ZLIB_INTERNAL _dist_code[DIST_CODE_LEN] = {\n");
-    for (i = 0; i < DIST_CODE_LEN; i++) {
-        fprintf(header, "%2u%s", _dist_code[i],
-                SEPARATOR(i, DIST_CODE_LEN-1, 20));
-    }
-
-    fprintf(header,
-        "const uch ZLIB_INTERNAL _length_code[MAX_MATCH-MIN_MATCH+1]= {\n");
-    for (i = 0; i < MAX_MATCH-MIN_MATCH+1; i++) {
-        fprintf(header, "%2u%s", _length_code[i],
-                SEPARATOR(i, MAX_MATCH-MIN_MATCH, 20));
-    }
-
-    fprintf(header, "local const int base_length[LENGTH_CODES] = {\n");
-    for (i = 0; i < LENGTH_CODES; i++) {
-        fprintf(header, "%1u%s", base_length[i],
-                SEPARATOR(i, LENGTH_CODES-1, 20));
-    }
-
-    fprintf(header, "local const int base_dist[D_CODES] = {\n");
-    for (i = 0; i < D_CODES; i++) {
-        fprintf(header, "%5u%s", base_dist[i],
-                SEPARATOR(i, D_CODES-1, 10));
-    }
-
-    fclose(header);
-}
-#endif /* GEN_TREES_H */
-
-/* ===========================================================================
- * Initialize the tree data structures for a new zlib stream.
- */
-void ZLIB_INTERNAL _tr_init(s)
-    deflate_state *s;
-{
-    tr_static_init();
-
-    s->l_desc.dyn_tree = s->dyn_ltree;
-    s->l_desc.stat_desc = &static_l_desc;
-
-    s->d_desc.dyn_tree = s->dyn_dtree;
-    s->d_desc.stat_desc = &static_d_desc;
-
-    s->bl_desc.dyn_tree = s->bl_tree;
-    s->bl_desc.stat_desc = &static_bl_desc;
-
-    s->bi_buf = 0;
-    s->bi_valid = 0;
-#ifdef ZLIB_DEBUG
-    s->compressed_len = 0L;
-    s->bits_sent = 0L;
-#endif
-
-    /* Initialize the first block of the first file: */
-    init_block(s);
-}
-
-/* ===========================================================================
- * Initialize a new block.
- */
-local void init_block(s)
-    deflate_state *s;
-{
-    int n; /* iterates over tree elements */
-
-    /* Initialize the trees. */
-    for (n = 0; n < L_CODES;  n++) s->dyn_ltree[n].Freq = 0;
-    for (n = 0; n < D_CODES;  n++) s->dyn_dtree[n].Freq = 0;
-    for (n = 0; n < BL_CODES; n++) s->bl_tree[n].Freq = 0;
-
-    s->dyn_ltree[END_BLOCK].Freq = 1;
-    s->opt_len = s->static_len = 0L;
-    s->last_lit = s->matches = 0;
-}
-
-#define SMALLEST 1
-/* Index within the heap array of least frequent node in the Huffman tree */
-
-
-/* ===========================================================================
- * Remove the smallest element from the heap and recreate the heap with
- * one less element. Updates heap and heap_len.
- */
-#define pqremove(s, tree, top) \
-{\
-    top = s->heap[SMALLEST]; \
-    s->heap[SMALLEST] = s->heap[s->heap_len--]; \
-    pqdownheap(s, tree, SMALLEST); \
-}
-
-/* ===========================================================================
- * Compares to subtrees, using the tree depth as tie breaker when
- * the subtrees have equal frequency. This minimizes the worst case length.
- */
-#define smaller(tree, n, m, depth) \
-   (tree[n].Freq < tree[m].Freq || \
-   (tree[n].Freq == tree[m].Freq && depth[n] <= depth[m]))
-
-/* ===========================================================================
- * Restore the heap property by moving down the tree starting at node k,
- * exchanging a node with the smallest of its two sons if necessary, stopping
- * when the heap property is re-established (each father smaller than its
- * two sons).
- */
-local void pqdownheap(s, tree, k)
-    deflate_state *s;
-    ct_data *tree;  /* the tree to restore */
-    int k;               /* node to move down */
-{
-    int v = s->heap[k];
-    int j = k << 1;  /* left son of k */
-    while (j <= s->heap_len) {
-        /* Set j to the smallest of the two sons: */
-        if (j < s->heap_len &&
-            smaller(tree, s->heap[j+1], s->heap[j], s->depth)) {
-            j++;
-        }
-        /* Exit if v is smaller than both sons */
-        if (smaller(tree, v, s->heap[j], s->depth)) break;
-
-        /* Exchange v with the smallest son */
-        s->heap[k] = s->heap[j];  k = j;
-
-        /* And continue down the tree, setting j to the left son of k */
-        j <<= 1;
-    }
-    s->heap[k] = v;
-}
-
-/* ===========================================================================
- * Compute the optimal bit lengths for a tree and update the total bit length
- * for the current block.
- * IN assertion: the fields freq and dad are set, heap[heap_max] and
- *    above are the tree nodes sorted by increasing frequency.
- * OUT assertions: the field len is set to the optimal bit length, the
- *     array bl_count contains the frequencies for each bit length.
- *     The length opt_len is updated; static_len is also updated if stree is
- *     not null.
- */
-local void gen_bitlen(s, desc)
-    deflate_state *s;
-    tree_desc *desc;    /* the tree descriptor */
-{
-    ct_data *tree        = desc->dyn_tree;
-    int max_code         = desc->max_code;
-    const ct_data *stree = desc->stat_desc->static_tree;
-    const intf *extra    = desc->stat_desc->extra_bits;
-    int base             = desc->stat_desc->extra_base;
-    int max_length       = desc->stat_desc->max_length;
-    int h;              /* heap index */
-    int n, m;           /* iterate over the tree elements */
-    int bits;           /* bit length */
-    int xbits;          /* extra bits */
-    ush f;              /* frequency */
-    int overflow = 0;   /* number of elements with bit length too large */
-
-    for (bits = 0; bits <= MAX_BITS; bits++) s->bl_count[bits] = 0;
-
-    /* In a first pass, compute the optimal bit lengths (which may
-     * overflow in the case of the bit length tree).
-     */
-    tree[s->heap[s->heap_max]].Len = 0; /* root of the heap */
-
-    for (h = s->heap_max+1; h < HEAP_SIZE; h++) {
-        n = s->heap[h];
-        bits = tree[tree[n].Dad].Len + 1;
-        if (bits > max_length) bits = max_length, overflow++;
-        tree[n].Len = (ush)bits;
-        /* We overwrite tree[n].Dad which is no longer needed */
-
-        if (n > max_code) continue; /* not a leaf node */
-
-        s->bl_count[bits]++;
-        xbits = 0;
-        if (n >= base) xbits = extra[n-base];
-        f = tree[n].Freq;
-        s->opt_len += (ulg)f * (unsigned)(bits + xbits);
-        if (stree) s->static_len += (ulg)f * (unsigned)(stree[n].Len + xbits);
-    }
-    if (overflow == 0) return;
-
-    Tracev((stderr,"\nbit length overflow\n"));
-    /* This happens for example on obj2 and pic of the Calgary corpus */
-
-    /* Find the first bit length which could increase: */
-    do {
-        bits = max_length-1;
-        while (s->bl_count[bits] == 0) bits--;
-        s->bl_count[bits]--;      /* move one leaf down the tree */
-        s->bl_count[bits+1] += 2; /* move one overflow item as its brother */
-        s->bl_count[max_length]--;
-        /* The brother of the overflow item also moves one step up,
-         * but this does not affect bl_count[max_length]
-         */
-        overflow -= 2;
-    } while (overflow > 0);
-
-    /* Now recompute all bit lengths, scanning in increasing frequency.
-     * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
-     * lengths instead of fixing only the wrong ones. This idea is taken
-     * from 'ar' written by Haruhiko Okumura.)
-     */
-    for (bits = max_length; bits != 0; bits--) {
-        n = s->bl_count[bits];
-        while (n != 0) {
-            m = s->heap[--h];
-            if (m > max_code) continue;
-            if ((unsigned) tree[m].Len != (unsigned) bits) {
-                Tracev((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
-                s->opt_len += ((ulg)bits - tree[m].Len) * tree[m].Freq;
-                tree[m].Len = (ush)bits;
-            }
-            n--;
-        }
-    }
-}
-
-/* ===========================================================================
- * Generate the codes for a given tree and bit counts (which need not be
- * optimal).
- * IN assertion: the array bl_count contains the bit length statistics for
- * the given tree and the field len is set for all tree elements.
- * OUT assertion: the field code is set for all tree elements of non
- *     zero code length.
- */
-local void gen_codes (tree, max_code, bl_count)
-    ct_data *tree;             /* the tree to decorate */
-    int max_code;              /* largest code with non zero frequency */
-    ushf *bl_count;            /* number of codes at each bit length */
-{
-    ush next_code[MAX_BITS+1]; /* next code value for each bit length */
-    unsigned code = 0;         /* running code value */
-    int bits;                  /* bit index */
-    int n;                     /* code index */
-
-    /* The distribution counts are first used to generate the code values
-     * without bit reversal.
-     */
-    for (bits = 1; bits <= MAX_BITS; bits++) {
-        code = (code + bl_count[bits-1]) << 1;
-        next_code[bits] = (ush)code;
-    }
-    /* Check that the bit counts in bl_count are consistent. The last code
-     * must be all ones.
-     */
-    Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,
-            "inconsistent bit counts");
-    Tracev((stderr,"\ngen_codes: max_code %d ", max_code));
-
-    for (n = 0;  n <= max_code; n++) {
-        int len = tree[n].Len;
-        if (len == 0) continue;
-        /* Now reverse the bits */
-        tree[n].Code = (ush)bi_reverse(next_code[len]++, len);
-
-        Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
-             n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
-    }
-}
-
-/* ===========================================================================
- * Construct one Huffman tree and assigns the code bit strings and lengths.
- * Update the total bit length for the current block.
- * IN assertion: the field freq is set for all tree elements.
- * OUT assertions: the fields len and code are set to the optimal bit length
- *     and corresponding code. The length opt_len is updated; static_len is
- *     also updated if stree is not null. The field max_code is set.
- */
-local void build_tree(s, desc)
-    deflate_state *s;
-    tree_desc *desc; /* the tree descriptor */
-{
-    ct_data *tree         = desc->dyn_tree;
-    const ct_data *stree  = desc->stat_desc->static_tree;
-    int elems             = desc->stat_desc->elems;
-    int n, m;          /* iterate over heap elements */
-    int max_code = -1; /* largest code with non zero frequency */
-    int node;          /* new node being created */
-
-    /* Construct the initial heap, with least frequent element in
-     * heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1].
-     * heap[0] is not used.
-     */
-    s->heap_len = 0, s->heap_max = HEAP_SIZE;
-
-    for (n = 0; n < elems; n++) {
-        if (tree[n].Freq != 0) {
-            s->heap[++(s->heap_len)] = max_code = n;
-            s->depth[n] = 0;
-        } else {
-            tree[n].Len = 0;
-        }
-    }
-
-    /* The pkzip format requires that at least one distance code exists,
-     * and that at least one bit should be sent even if there is only one
-     * possible code. So to avoid special checks later on we force at least
-     * two codes of non zero frequency.
-     */
-    while (s->heap_len < 2) {
-        node = s->heap[++(s->heap_len)] = (max_code < 2 ? ++max_code : 0);
-        tree[node].Freq = 1;
-        s->depth[node] = 0;
-        s->opt_len--; if (stree) s->static_len -= stree[node].Len;
-        /* node is 0 or 1 so it does not have extra bits */
-    }
-    desc->max_code = max_code;
-
-    /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
-     * establish sub-heaps of increasing lengths:
-     */
-    for (n = s->heap_len/2; n >= 1; n--) pqdownheap(s, tree, n);
-
-    /* Construct the Huffman tree by repeatedly combining the least two
-     * frequent nodes.
-     */
-    node = elems;              /* next internal node of the tree */
-    do {
-        pqremove(s, tree, n);  /* n = node of least frequency */
-        m = s->heap[SMALLEST]; /* m = node of next least frequency */
-
-        s->heap[--(s->heap_max)] = n; /* keep the nodes sorted by frequency */
-        s->heap[--(s->heap_max)] = m;
-
-        /* Create a new node father of n and m */
-        tree[node].Freq = tree[n].Freq + tree[m].Freq;
-        s->depth[node] = (uch)((s->depth[n] >= s->depth[m] ?
-                                s->depth[n] : s->depth[m]) + 1);
-        tree[n].Dad = tree[m].Dad = (ush)node;
-#ifdef DUMP_BL_TREE
-        if (tree == s->bl_tree) {
-            fprintf(stderr,"\nnode %d(%d), sons %d(%d) %d(%d)",
-                    node, tree[node].Freq, n, tree[n].Freq, m, tree[m].Freq);
-        }
-#endif
-        /* and insert the new node in the heap */
-        s->heap[SMALLEST] = node++;
-        pqdownheap(s, tree, SMALLEST);
-
-    } while (s->heap_len >= 2);
-
-    s->heap[--(s->heap_max)] = s->heap[SMALLEST];
-
-    /* At this point, the fields freq and dad are set. We can now
-     * generate the bit lengths.
-     */
-    gen_bitlen(s, (tree_desc *)desc);
-
-    /* The field len is now set, we can generate the bit codes */
-    gen_codes ((ct_data *)tree, max_code, s->bl_count);
-}
-
-/* ===========================================================================
- * Scan a literal or distance tree to determine the frequencies of the codes
- * in the bit length tree.
- */
-local void scan_tree (s, tree, max_code)
-    deflate_state *s;
-    ct_data *tree;   /* the tree to be scanned */
-    int max_code;    /* and its largest code of non zero frequency */
-{
-    int n;                     /* iterates over all tree elements */
-    int prevlen = -1;          /* last emitted length */
-    int curlen;                /* length of current code */
-    int nextlen = tree[0].Len; /* length of next code */
-    int count = 0;             /* repeat count of the current code */
-    int max_count = 7;         /* max repeat count */
-    int min_count = 4;         /* min repeat count */
-
-    if (nextlen == 0) max_count = 138, min_count = 3;
-    tree[max_code+1].Len = (ush)0xffff; /* guard */
-
-    for (n = 0; n <= max_code; n++) {
-        curlen = nextlen; nextlen = tree[n+1].Len;
-        if (++count < max_count && curlen == nextlen) {
-            continue;
-        } else if (count < min_count) {
-            s->bl_tree[curlen].Freq += count;
-        } else if (curlen != 0) {
-            if (curlen != prevlen) s->bl_tree[curlen].Freq++;
-            s->bl_tree[REP_3_6].Freq++;
-        } else if (count <= 10) {
-            s->bl_tree[REPZ_3_10].Freq++;
-        } else {
-            s->bl_tree[REPZ_11_138].Freq++;
-        }
-        count = 0; prevlen = curlen;
-        if (nextlen == 0) {
-            max_count = 138, min_count = 3;
-        } else if (curlen == nextlen) {
-            max_count = 6, min_count = 3;
-        } else {
-            max_count = 7, min_count = 4;
-        }
-    }
-}
-
-/* ===========================================================================
- * Send a literal or distance tree in compressed form, using the codes in
- * bl_tree.
- */
-local void send_tree (s, tree, max_code)
-    deflate_state *s;
-    ct_data *tree; /* the tree to be scanned */
-    int max_code;       /* and its largest code of non zero frequency */
-{
-    int n;                     /* iterates over all tree elements */
-    int prevlen = -1;          /* last emitted length */
-    int curlen;                /* length of current code */
-    int nextlen = tree[0].Len; /* length of next code */
-    int count = 0;             /* repeat count of the current code */
-    int max_count = 7;         /* max repeat count */
-    int min_count = 4;         /* min repeat count */
-
-    /* tree[max_code+1].Len = -1; */  /* guard already set */
-    if (nextlen == 0) max_count = 138, min_count = 3;
-
-    for (n = 0; n <= max_code; n++) {
-        curlen = nextlen; nextlen = tree[n+1].Len;
-        if (++count < max_count && curlen == nextlen) {
-            continue;
-        } else if (count < min_count) {
-            do { send_code(s, curlen, s->bl_tree); } while (--count != 0);
-
-        } else if (curlen != 0) {
-            if (curlen != prevlen) {
-                send_code(s, curlen, s->bl_tree); count--;
-            }
-            Assert(count >= 3 && count <= 6, " 3_6?");
-            send_code(s, REP_3_6, s->bl_tree); send_bits(s, count-3, 2);
-
-        } else if (count <= 10) {
-            send_code(s, REPZ_3_10, s->bl_tree); send_bits(s, count-3, 3);
-
-        } else {
-            send_code(s, REPZ_11_138, s->bl_tree); send_bits(s, count-11, 7);
-        }
-        count = 0; prevlen = curlen;
-        if (nextlen == 0) {
-            max_count = 138, min_count = 3;
-        } else if (curlen == nextlen) {
-            max_count = 6, min_count = 3;
-        } else {
-            max_count = 7, min_count = 4;
-        }
-    }
-}
-
-/* ===========================================================================
- * Construct the Huffman tree for the bit lengths and return the index in
- * bl_order of the last bit length code to send.
- */
-local int build_bl_tree(s)
-    deflate_state *s;
-{
-    int max_blindex;  /* index of last bit length code of non zero freq */
-
-    /* Determine the bit length frequencies for literal and distance trees */
-    scan_tree(s, (ct_data *)s->dyn_ltree, s->l_desc.max_code);
-    scan_tree(s, (ct_data *)s->dyn_dtree, s->d_desc.max_code);
-
-    /* Build the bit length tree: */
-    build_tree(s, (tree_desc *)(&(s->bl_desc)));
-    /* opt_len now includes the length of the tree representations, except
-     * the lengths of the bit lengths codes and the 5+5+4 bits for the counts.
-     */
-
-    /* Determine the number of bit length codes to send. The pkzip format
-     * requires that at least 4 bit length codes be sent. (appnote.txt says
-     * 3 but the actual value used is 4.)
-     */
-    for (max_blindex = BL_CODES-1; max_blindex >= 3; max_blindex--) {
-        if (s->bl_tree[bl_order[max_blindex]].Len != 0) break;
-    }
-    /* Update opt_len to include the bit length tree and counts */
-    s->opt_len += 3*((ulg)max_blindex+1) + 5+5+4;
-    Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld",
-            s->opt_len, s->static_len));
-
-    return max_blindex;
-}
-
-/* ===========================================================================
- * Send the header for a block using dynamic Huffman trees: the counts, the
- * lengths of the bit length codes, the literal tree and the distance tree.
- * IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4.
- */
-local void send_all_trees(s, lcodes, dcodes, blcodes)
-    deflate_state *s;
-    int lcodes, dcodes, blcodes; /* number of codes for each tree */
-{
-    int rank;                    /* index in bl_order */
-
-    Assert (lcodes >= 257 && dcodes >= 1 && blcodes >= 4, "not enough codes");
-    Assert (lcodes <= L_CODES && dcodes <= D_CODES && blcodes <= BL_CODES,
-            "too many codes");
-    Tracev((stderr, "\nbl counts: "));
-    send_bits(s, lcodes-257, 5); /* not +255 as stated in appnote.txt */
-    send_bits(s, dcodes-1,   5);
-    send_bits(s, blcodes-4,  4); /* not -3 as stated in appnote.txt */
-    for (rank = 0; rank < blcodes; rank++) {
-        Tracev((stderr, "\nbl code %2d ", bl_order[rank]));
-        send_bits(s, s->bl_tree[bl_order[rank]].Len, 3);
-    }
-    Tracev((stderr, "\nbl tree: sent %ld", s->bits_sent));
-
-    send_tree(s, (ct_data *)s->dyn_ltree, lcodes-1); /* literal tree */
-    Tracev((stderr, "\nlit tree: sent %ld", s->bits_sent));
-
-    send_tree(s, (ct_data *)s->dyn_dtree, dcodes-1); /* distance tree */
-    Tracev((stderr, "\ndist tree: sent %ld", s->bits_sent));
-}
-
-/* ===========================================================================
- * Send a stored block
- */
-void ZLIB_INTERNAL _tr_stored_block(s, buf, stored_len, last)
-    deflate_state *s;
-    charf *buf;       /* input block */
-    ulg stored_len;   /* length of input block */
-    int last;         /* one if this is the last block for a file */
-{
-    send_bits(s, (STORED_BLOCK<<1)+last, 3);    /* send block type */
-    bi_windup(s);        /* align on byte boundary */
-    put_short(s, (ush)stored_len);
-    put_short(s, (ush)~stored_len);
-    zmemcpy(s->pending_buf + s->pending, (Bytef *)buf, stored_len);
-    s->pending += stored_len;
-#ifdef ZLIB_DEBUG
-    s->compressed_len = (s->compressed_len + 3 + 7) & (ulg)~7L;
-    s->compressed_len += (stored_len + 4) << 3;
-    s->bits_sent += 2*16;
-    s->bits_sent += stored_len<<3;
-#endif
-}
-
-/* ===========================================================================
- * Flush the bits in the bit buffer to pending output (leaves at most 7 bits)
- */
-void ZLIB_INTERNAL _tr_flush_bits(s)
-    deflate_state *s;
-{
-    bi_flush(s);
-}
-
-/* ===========================================================================
- * Send one empty static block to give enough lookahead for inflate.
- * This takes 10 bits, of which 7 may remain in the bit buffer.
- */
-void ZLIB_INTERNAL _tr_align(s)
-    deflate_state *s;
-{
-    send_bits(s, STATIC_TREES<<1, 3);
-    send_code(s, END_BLOCK, static_ltree);
-#ifdef ZLIB_DEBUG
-    s->compressed_len += 10L; /* 3 for block type, 7 for EOB */
-#endif
-    bi_flush(s);
-}
-
-/* ===========================================================================
- * Determine the best encoding for the current block: dynamic trees, static
- * trees or store, and write out the encoded block.
- */
-void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last)
-    deflate_state *s;
-    charf *buf;       /* input block, or NULL if too old */
-    ulg stored_len;   /* length of input block */
-    int last;         /* one if this is the last block for a file */
-{
-    ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */
-    int max_blindex = 0;  /* index of last bit length code of non zero freq */
-
-    /* Build the Huffman trees unless a stored block is forced */
-    if (s->level > 0) {
-
-        /* Check if the file is binary or text */
-        if (s->strm->data_type == Z_UNKNOWN)
-            s->strm->data_type = detect_data_type(s);
-
-        /* Construct the literal and distance trees */
-        build_tree(s, (tree_desc *)(&(s->l_desc)));
-        Tracev((stderr, "\nlit data: dyn %ld, stat %ld", s->opt_len,
-                s->static_len));
-
-        build_tree(s, (tree_desc *)(&(s->d_desc)));
-        Tracev((stderr, "\ndist data: dyn %ld, stat %ld", s->opt_len,
-                s->static_len));
-        /* At this point, opt_len and static_len are the total bit lengths of
-         * the compressed block data, excluding the tree representations.
-         */
-
-        /* Build the bit length tree for the above two trees, and get the index
-         * in bl_order of the last bit length code to send.
-         */
-        max_blindex = build_bl_tree(s);
-
-        /* Determine the best encoding. Compute the block lengths in bytes. */
-        opt_lenb = (s->opt_len+3+7)>>3;
-        static_lenb = (s->static_len+3+7)>>3;
-
-        Tracev((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u ",
-                opt_lenb, s->opt_len, static_lenb, s->static_len, stored_len,
-                s->last_lit));
-
-        if (static_lenb <= opt_lenb) opt_lenb = static_lenb;
-
-    } else {
-        Assert(buf != (char*)0, "lost buf");
-        opt_lenb = static_lenb = stored_len + 5; /* force a stored block */
-    }
-
-#ifdef FORCE_STORED
-    if (buf != (char*)0) { /* force stored block */
-#else
-    if (stored_len+4 <= opt_lenb && buf != (char*)0) {
-                       /* 4: two words for the lengths */
-#endif
-        /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.
-         * Otherwise we can't have processed more than WSIZE input bytes since
-         * the last block flush, because compression would have been
-         * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
-         * transform a block into a stored block.
-         */
-        _tr_stored_block(s, buf, stored_len, last);
-
-#ifdef FORCE_STATIC
-    } else if (static_lenb >= 0) { /* force static trees */
-#else
-    } else if (s->strategy == Z_FIXED || static_lenb == opt_lenb) {
-#endif
-        send_bits(s, (STATIC_TREES<<1)+last, 3);
-        compress_block(s, (const ct_data *)static_ltree,
-                       (const ct_data *)static_dtree);
-#ifdef ZLIB_DEBUG
-        s->compressed_len += 3 + s->static_len;
-#endif
-    } else {
-        send_bits(s, (DYN_TREES<<1)+last, 3);
-        send_all_trees(s, s->l_desc.max_code+1, s->d_desc.max_code+1,
-                       max_blindex+1);
-        compress_block(s, (const ct_data *)s->dyn_ltree,
-                       (const ct_data *)s->dyn_dtree);
-#ifdef ZLIB_DEBUG
-        s->compressed_len += 3 + s->opt_len;
-#endif
-    }
-    Assert (s->compressed_len == s->bits_sent, "bad compressed size");
-    /* The above check is made mod 2^32, for files larger than 512 MB
-     * and uLong implemented on 32 bits.
-     */
-    init_block(s);
-
-    if (last) {
-        bi_windup(s);
-#ifdef ZLIB_DEBUG
-        s->compressed_len += 7;  /* align on byte boundary */
-#endif
-    }
-    Tracev((stderr,"\ncomprlen %lu(%lu) ", s->compressed_len>>3,
-           s->compressed_len-7*last));
-}
-
-/* ===========================================================================
- * Save the match info and tally the frequency counts. Return true if
- * the current block must be flushed.
- */
-int ZLIB_INTERNAL _tr_tally (s, dist, lc)
-    deflate_state *s;
-    unsigned dist;  /* distance of matched string */
-    unsigned lc;    /* match length-MIN_MATCH or unmatched char (if dist==0) */
-{
-    s->d_buf[s->last_lit] = (ush)dist;
-    s->l_buf[s->last_lit++] = (uch)lc;
-    if (dist == 0) {
-        /* lc is the unmatched char */
-        s->dyn_ltree[lc].Freq++;
-    } else {
-        s->matches++;
-        /* Here, lc is the match length - MIN_MATCH */
-        dist--;             /* dist = match distance - 1 */
-        Assert((ush)dist < (ush)MAX_DIST(s) &&
-               (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&
-               (ush)d_code(dist) < (ush)D_CODES,  "_tr_tally: bad match");
-
-        s->dyn_ltree[_length_code[lc]+LITERALS+1].Freq++;
-        s->dyn_dtree[d_code(dist)].Freq++;
-    }
-
-#ifdef TRUNCATE_BLOCK
-    /* Try to guess if it is profitable to stop the current block here */
-    if ((s->last_lit & 0x1fff) == 0 && s->level > 2) {
-        /* Compute an upper bound for the compressed length */
-        ulg out_length = (ulg)s->last_lit*8L;
-        ulg in_length = (ulg)((long)s->strstart - s->block_start);
-        int dcode;
-        for (dcode = 0; dcode < D_CODES; dcode++) {
-            out_length += (ulg)s->dyn_dtree[dcode].Freq *
-                (5L+extra_dbits[dcode]);
-        }
-        out_length >>= 3;
-        Tracev((stderr,"\nlast_lit %u, in %ld, out ~%ld(%ld%%) ",
-               s->last_lit, in_length, out_length,
-               100L - out_length*100L/in_length));
-        if (s->matches < s->last_lit/2 && out_length < in_length/2) return 1;
-    }
-#endif
-    return (s->last_lit == s->lit_bufsize-1);
-    /* We avoid equality with lit_bufsize because of wraparound at 64K
-     * on 16 bit machines and because stored blocks are restricted to
-     * 64K-1 bytes.
-     */
-}
-
-/* ===========================================================================
- * Send the block data compressed using the given Huffman trees
- */
-local void compress_block(s, ltree, dtree)
-    deflate_state *s;
-    const ct_data *ltree; /* literal tree */
-    const ct_data *dtree; /* distance tree */
-{
-    unsigned dist;      /* distance of matched string */
-    int lc;             /* match length or unmatched char (if dist == 0) */
-    unsigned lx = 0;    /* running index in l_buf */
-    unsigned code;      /* the code to send */
-    int extra;          /* number of extra bits to send */
-
-    if (s->last_lit != 0) do {
-        dist = s->d_buf[lx];
-        lc = s->l_buf[lx++];
-        if (dist == 0) {
-            send_code(s, lc, ltree); /* send a literal byte */
-            Tracecv(isgraph(lc), (stderr," '%c' ", lc));
-        } else {
-            /* Here, lc is the match length - MIN_MATCH */
-            code = _length_code[lc];
-            send_code(s, code+LITERALS+1, ltree); /* send the length code */
-            extra = extra_lbits[code];
-            if (extra != 0) {
-                lc -= base_length[code];
-                send_bits(s, lc, extra);       /* send the extra length bits */
-            }
-            dist--; /* dist is now the match distance - 1 */
-            code = d_code(dist);
-            Assert (code < D_CODES, "bad d_code");
-
-            send_code(s, code, dtree);       /* send the distance code */
-            extra = extra_dbits[code];
-            if (extra != 0) {
-                dist -= (unsigned)base_dist[code];
-                send_bits(s, dist, extra);   /* send the extra distance bits */
-            }
-        } /* literal or match pair ? */
-
-        /* Check that the overlay between pending_buf and d_buf+l_buf is ok: */
-        Assert((uInt)(s->pending) < s->lit_bufsize + 2*lx,
-               "pendingBuf overflow");
-
-    } while (lx < s->last_lit);
-
-    send_code(s, END_BLOCK, ltree);
-}
-
-/* ===========================================================================
- * Check if the data type is TEXT or BINARY, using the following algorithm:
- * - TEXT if the two conditions below are satisfied:
- *    a) There are no non-portable control characters belonging to the
- *       "black list" (0..6, 14..25, 28..31).
- *    b) There is at least one printable character belonging to the
- *       "white list" (9 {TAB}, 10 {LF}, 13 {CR}, 32..255).
- * - BINARY otherwise.
- * - The following partially-portable control characters form a
- *   "gray list" that is ignored in this detection algorithm:
- *   (7 {BEL}, 8 {BS}, 11 {VT}, 12 {FF}, 26 {SUB}, 27 {ESC}).
- * IN assertion: the fields Freq of dyn_ltree are set.
- */
-local int detect_data_type(s)
-    deflate_state *s;
-{
-    /* black_mask is the bit mask of black-listed bytes
-     * set bits 0..6, 14..25, and 28..31
-     * 0xf3ffc07f = binary 11110011111111111100000001111111
-     */
-    unsigned long black_mask = 0xf3ffc07fUL;
-    int n;
-
-    /* Check for non-textual ("black-listed") bytes. */
-    for (n = 0; n <= 31; n++, black_mask >>= 1)
-        if ((black_mask & 1) && (s->dyn_ltree[n].Freq != 0))
-            return Z_BINARY;
-
-    /* Check for textual ("white-listed") bytes. */
-    if (s->dyn_ltree[9].Freq != 0 || s->dyn_ltree[10].Freq != 0
-            || s->dyn_ltree[13].Freq != 0)
-        return Z_TEXT;
-    for (n = 32; n < LITERALS; n++)
-        if (s->dyn_ltree[n].Freq != 0)
-            return Z_TEXT;
-
-    /* There are no "black-listed" or "white-listed" bytes:
-     * this stream either is empty or has tolerated ("gray-listed") bytes only.
-     */
-    return Z_BINARY;
-}
-
-/* ===========================================================================
- * Reverse the first len bits of a code, using straightforward code (a faster
- * method would use a table)
- * IN assertion: 1 <= len <= 15
- */
-local unsigned bi_reverse(code, len)
-    unsigned code; /* the value to invert */
-    int len;       /* its bit length */
-{
-    register unsigned res = 0;
-    do {
-        res |= code & 1;
-        code >>= 1, res <<= 1;
-    } while (--len > 0);
-    return res >> 1;
-}
-
-/* ===========================================================================
- * Flush the bit buffer, keeping at most 7 bits in it.
- */
-local void bi_flush(s)
-    deflate_state *s;
-{
-    if (s->bi_valid == 16) {
-        put_short(s, s->bi_buf);
-        s->bi_buf = 0;
-        s->bi_valid = 0;
-    } else if (s->bi_valid >= 8) {
-        put_byte(s, (Byte)s->bi_buf);
-        s->bi_buf >>= 8;
-        s->bi_valid -= 8;
-    }
-}
-
-/* ===========================================================================
- * Flush the bit buffer and align the output on a byte boundary
- */
-local void bi_windup(s)
-    deflate_state *s;
-{
-    if (s->bi_valid > 8) {
-        put_short(s, s->bi_buf);
-    } else if (s->bi_valid > 0) {
-        put_byte(s, (Byte)s->bi_buf);
-    }
-    s->bi_buf = 0;
-    s->bi_valid = 0;
-#ifdef ZLIB_DEBUG
-    s->bits_sent = (s->bits_sent+7) & ~7;
-#endif
-}
diff --git a/src/png/zlib/trees.h b/src/png/zlib/trees.h
deleted file mode 100644
index d35639d82..000000000
--- a/src/png/zlib/trees.h
+++ /dev/null
@@ -1,128 +0,0 @@
-/* header created automatically with -DGEN_TREES_H */
-
-local const ct_data static_ltree[L_CODES+2] = {
-{{ 12},{  8}}, {{140},{  8}}, {{ 76},{  8}}, {{204},{  8}}, {{ 44},{  8}},
-{{172},{  8}}, {{108},{  8}}, {{236},{  8}}, {{ 28},{  8}}, {{156},{  8}},
-{{ 92},{  8}}, {{220},{  8}}, {{ 60},{  8}}, {{188},{  8}}, {{124},{  8}},
-{{252},{  8}}, {{  2},{  8}}, {{130},{  8}}, {{ 66},{  8}}, {{194},{  8}},
-{{ 34},{  8}}, {{162},{  8}}, {{ 98},{  8}}, {{226},{  8}}, {{ 18},{  8}},
-{{146},{  8}}, {{ 82},{  8}}, {{210},{  8}}, {{ 50},{  8}}, {{178},{  8}},
-{{114},{  8}}, {{242},{  8}}, {{ 10},{  8}}, {{138},{  8}}, {{ 74},{  8}},
-{{202},{  8}}, {{ 42},{  8}}, {{170},{  8}}, {{106},{  8}}, {{234},{  8}},
-{{ 26},{  8}}, {{154},{  8}}, {{ 90},{  8}}, {{218},{  8}}, {{ 58},{  8}},
-{{186},{  8}}, {{122},{  8}}, {{250},{  8}}, {{  6},{  8}}, {{134},{  8}},
-{{ 70},{  8}}, {{198},{  8}}, {{ 38},{  8}}, {{166},{  8}}, {{102},{  8}},
-{{230},{  8}}, {{ 22},{  8}}, {{150},{  8}}, {{ 86},{  8}}, {{214},{  8}},
-{{ 54},{  8}}, {{182},{  8}}, {{118},{  8}}, {{246},{  8}}, {{ 14},{  8}},
-{{142},{  8}}, {{ 78},{  8}}, {{206},{  8}}, {{ 46},{  8}}, {{174},{  8}},
-{{110},{  8}}, {{238},{  8}}, {{ 30},{  8}}, {{158},{  8}}, {{ 94},{  8}},
-{{222},{  8}}, {{ 62},{  8}}, {{190},{  8}}, {{126},{  8}}, {{254},{  8}},
-{{  1},{  8}}, {{129},{  8}}, {{ 65},{  8}}, {{193},{  8}}, {{ 33},{  8}},
-{{161},{  8}}, {{ 97},{  8}}, {{225},{  8}}, {{ 17},{  8}}, {{145},{  8}},
-{{ 81},{  8}}, {{209},{  8}}, {{ 49},{  8}}, {{177},{  8}}, {{113},{  8}},
-{{241},{  8}}, {{  9},{  8}}, {{137},{  8}}, {{ 73},{  8}}, {{201},{  8}},
-{{ 41},{  8}}, {{169},{  8}}, {{105},{  8}}, {{233},{  8}}, {{ 25},{  8}},
-{{153},{  8}}, {{ 89},{  8}}, {{217},{  8}}, {{ 57},{  8}}, {{185},{  8}},
-{{121},{  8}}, {{249},{  8}}, {{  5},{  8}}, {{133},{  8}}, {{ 69},{  8}},
-{{197},{  8}}, {{ 37},{  8}}, {{165},{  8}}, {{101},{  8}}, {{229},{  8}},
-{{ 21},{  8}}, {{149},{  8}}, {{ 85},{  8}}, {{213},{  8}}, {{ 53},{  8}},
-{{181},{  8}}, {{117},{  8}}, {{245},{  8}}, {{ 13},{  8}}, {{141},{  8}},
-{{ 77},{  8}}, {{205},{  8}}, {{ 45},{  8}}, {{173},{  8}}, {{109},{  8}},
-{{237},{  8}}, {{ 29},{  8}}, {{157},{  8}}, {{ 93},{  8}}, {{221},{  8}},
-{{ 61},{  8}}, {{189},{  8}}, {{125},{  8}}, {{253},{  8}}, {{ 19},{  9}},
-{{275},{  9}}, {{147},{  9}}, {{403},{  9}}, {{ 83},{  9}}, {{339},{  9}},
-{{211},{  9}}, {{467},{  9}}, {{ 51},{  9}}, {{307},{  9}}, {{179},{  9}},
-{{435},{  9}}, {{115},{  9}}, {{371},{  9}}, {{243},{  9}}, {{499},{  9}},
-{{ 11},{  9}}, {{267},{  9}}, {{139},{  9}}, {{395},{  9}}, {{ 75},{  9}},
-{{331},{  9}}, {{203},{  9}}, {{459},{  9}}, {{ 43},{  9}}, {{299},{  9}},
-{{171},{  9}}, {{427},{  9}}, {{107},{  9}}, {{363},{  9}}, {{235},{  9}},
-{{491},{  9}}, {{ 27},{  9}}, {{283},{  9}}, {{155},{  9}}, {{411},{  9}},
-{{ 91},{  9}}, {{347},{  9}}, {{219},{  9}}, {{475},{  9}}, {{ 59},{  9}},
-{{315},{  9}}, {{187},{  9}}, {{443},{  9}}, {{123},{  9}}, {{379},{  9}},
-{{251},{  9}}, {{507},{  9}}, {{  7},{  9}}, {{263},{  9}}, {{135},{  9}},
-{{391},{  9}}, {{ 71},{  9}}, {{327},{  9}}, {{199},{  9}}, {{455},{  9}},
-{{ 39},{  9}}, {{295},{  9}}, {{167},{  9}}, {{423},{  9}}, {{103},{  9}},
-{{359},{  9}}, {{231},{  9}}, {{487},{  9}}, {{ 23},{  9}}, {{279},{  9}},
-{{151},{  9}}, {{407},{  9}}, {{ 87},{  9}}, {{343},{  9}}, {{215},{  9}},
-{{471},{  9}}, {{ 55},{  9}}, {{311},{  9}}, {{183},{  9}}, {{439},{  9}},
-{{119},{  9}}, {{375},{  9}}, {{247},{  9}}, {{503},{  9}}, {{ 15},{  9}},
-{{271},{  9}}, {{143},{  9}}, {{399},{  9}}, {{ 79},{  9}}, {{335},{  9}},
-{{207},{  9}}, {{463},{  9}}, {{ 47},{  9}}, {{303},{  9}}, {{175},{  9}},
-{{431},{  9}}, {{111},{  9}}, {{367},{  9}}, {{239},{  9}}, {{495},{  9}},
-{{ 31},{  9}}, {{287},{  9}}, {{159},{  9}}, {{415},{  9}}, {{ 95},{  9}},
-{{351},{  9}}, {{223},{  9}}, {{479},{  9}}, {{ 63},{  9}}, {{319},{  9}},
-{{191},{  9}}, {{447},{  9}}, {{127},{  9}}, {{383},{  9}}, {{255},{  9}},
-{{511},{  9}}, {{  0},{  7}}, {{ 64},{  7}}, {{ 32},{  7}}, {{ 96},{  7}},
-{{ 16},{  7}}, {{ 80},{  7}}, {{ 48},{  7}}, {{112},{  7}}, {{  8},{  7}},
-{{ 72},{  7}}, {{ 40},{  7}}, {{104},{  7}}, {{ 24},{  7}}, {{ 88},{  7}},
-{{ 56},{  7}}, {{120},{  7}}, {{  4},{  7}}, {{ 68},{  7}}, {{ 36},{  7}},
-{{100},{  7}}, {{ 20},{  7}}, {{ 84},{  7}}, {{ 52},{  7}}, {{116},{  7}},
-{{  3},{  8}}, {{131},{  8}}, {{ 67},{  8}}, {{195},{  8}}, {{ 35},{  8}},
-{{163},{  8}}, {{ 99},{  8}}, {{227},{  8}}
-};
-
-local const ct_data static_dtree[D_CODES] = {
-{{ 0},{ 5}}, {{16},{ 5}}, {{ 8},{ 5}}, {{24},{ 5}}, {{ 4},{ 5}},
-{{20},{ 5}}, {{12},{ 5}}, {{28},{ 5}}, {{ 2},{ 5}}, {{18},{ 5}},
-{{10},{ 5}}, {{26},{ 5}}, {{ 6},{ 5}}, {{22},{ 5}}, {{14},{ 5}},
-{{30},{ 5}}, {{ 1},{ 5}}, {{17},{ 5}}, {{ 9},{ 5}}, {{25},{ 5}},
-{{ 5},{ 5}}, {{21},{ 5}}, {{13},{ 5}}, {{29},{ 5}}, {{ 3},{ 5}},
-{{19},{ 5}}, {{11},{ 5}}, {{27},{ 5}}, {{ 7},{ 5}}, {{23},{ 5}}
-};
-
-const uch ZLIB_INTERNAL _dist_code[DIST_CODE_LEN] = {
- 0,  1,  2,  3,  4,  4,  5,  5,  6,  6,  6,  6,  7,  7,  7,  7,  8,  8,  8,  8,
- 8,  8,  8,  8,  9,  9,  9,  9,  9,  9,  9,  9, 10, 10, 10, 10, 10, 10, 10, 10,
-10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
-11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
-12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13,
-13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
-13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
-14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
-14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
-14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15,
-15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
-15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
-15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,  0,  0, 16, 17,
-18, 18, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22,
-23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
-24, 24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
-26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
-26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27,
-27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
-27, 27, 27, 27, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
-28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
-28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
-28, 28, 28, 28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
-29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
-29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
-29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29
-};
-
-const uch ZLIB_INTERNAL _length_code[MAX_MATCH-MIN_MATCH+1]= {
- 0,  1,  2,  3,  4,  5,  6,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 12, 12,
-13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16,
-17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19,
-19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
-21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22,
-22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23,
-23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
-24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
-25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
-25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26, 26, 26,
-26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
-26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
-27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 28
-};
-
-local const int base_length[LENGTH_CODES] = {
-0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, 32, 40, 48, 56,
-64, 80, 96, 112, 128, 160, 192, 224, 0
-};
-
-local const int base_dist[D_CODES] = {
-    0,     1,     2,     3,     4,     6,     8,    12,    16,    24,
-   32,    48,    64,    96,   128,   192,   256,   384,   512,   768,
- 1024,  1536,  2048,  3072,  4096,  6144,  8192, 12288, 16384, 24576
-};
-
diff --git a/src/png/zlib/uncompr.c b/src/png/zlib/uncompr.c
deleted file mode 100644
index f03a1a865..000000000
--- a/src/png/zlib/uncompr.c
+++ /dev/null
@@ -1,93 +0,0 @@
-/* uncompr.c -- decompress a memory buffer
- * Copyright (C) 1995-2003, 2010, 2014, 2016 Jean-loup Gailly, Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* @(#) $Id$ */
-
-#define ZLIB_INTERNAL
-#include "zlib.h"
-
-/* ===========================================================================
-     Decompresses the source buffer into the destination buffer.  *sourceLen is
-   the byte length of the source buffer. Upon entry, *destLen is the total size
-   of the destination buffer, which must be large enough to hold the entire
-   uncompressed data. (The size of the uncompressed data must have been saved
-   previously by the compressor and transmitted to the decompressor by some
-   mechanism outside the scope of this compression library.) Upon exit,
-   *destLen is the size of the decompressed data and *sourceLen is the number
-   of source bytes consumed. Upon return, source + *sourceLen points to the
-   first unused input byte.
-
-     uncompress returns Z_OK if success, Z_MEM_ERROR if there was not enough
-   memory, Z_BUF_ERROR if there was not enough room in the output buffer, or
-   Z_DATA_ERROR if the input data was corrupted, including if the input data is
-   an incomplete zlib stream.
-*/
-int ZEXPORT uncompress2 (dest, destLen, source, sourceLen)
-    Bytef *dest;
-    uLongf *destLen;
-    const Bytef *source;
-    uLong *sourceLen;
-{
-    z_stream stream;
-    int err;
-    const uInt max = (uInt)-1;
-    uLong len, left;
-    Byte buf[1];    /* for detection of incomplete stream when *destLen == 0 */
-
-    len = *sourceLen;
-    if (*destLen) {
-        left = *destLen;
-        *destLen = 0;
-    }
-    else {
-        left = 1;
-        dest = buf;
-    }
-
-    stream.next_in = (z_const Bytef *)source;
-    stream.avail_in = 0;
-    stream.zalloc = (alloc_func)0;
-    stream.zfree = (free_func)0;
-    stream.opaque = (voidpf)0;
-
-    err = inflateInit(&stream);
-    if (err != Z_OK) return err;
-
-    stream.next_out = dest;
-    stream.avail_out = 0;
-
-    do {
-        if (stream.avail_out == 0) {
-            stream.avail_out = left > (uLong)max ? max : (uInt)left;
-            left -= stream.avail_out;
-        }
-        if (stream.avail_in == 0) {
-            stream.avail_in = len > (uLong)max ? max : (uInt)len;
-            len -= stream.avail_in;
-        }
-        err = inflate(&stream, Z_NO_FLUSH);
-    } while (err == Z_OK);
-
-    *sourceLen -= len + stream.avail_in;
-    if (dest != buf)
-        *destLen = stream.total_out;
-    else if (stream.total_out && err == Z_BUF_ERROR)
-        left = 1;
-
-    inflateEnd(&stream);
-    return err == Z_STREAM_END ? Z_OK :
-           err == Z_NEED_DICT ? Z_DATA_ERROR  :
-           err == Z_BUF_ERROR && left + stream.avail_out ? Z_DATA_ERROR :
-           err;
-}
-
-int ZEXPORT uncompress (dest, destLen, source, sourceLen)
-    Bytef *dest;
-    uLongf *destLen;
-    const Bytef *source;
-    uLong sourceLen;
-{
-    return uncompress2(dest, destLen, source, &sourceLen);
-}
diff --git a/src/png/zlib/watcom/watcom_f.mak b/src/png/zlib/watcom/watcom_f.mak
deleted file mode 100644
index 37f4d74c1..000000000
--- a/src/png/zlib/watcom/watcom_f.mak
+++ /dev/null
@@ -1,43 +0,0 @@
-# Makefile for zlib
-# OpenWatcom flat model
-# Last updated: 28-Dec-2005
-
-# To use, do "wmake -f watcom_f.mak"
-
-C_SOURCE =  adler32.c  compress.c crc32.c   deflate.c    &
-	    gzclose.c  gzlib.c    gzread.c  gzwrite.c    &
-            infback.c  inffast.c  inflate.c inftrees.c   &
-            trees.c    uncompr.c  zutil.c
-
-OBJS =      adler32.obj  compress.obj crc32.obj   deflate.obj    &
-	    gzclose.obj  gzlib.obj    gzread.obj  gzwrite.obj    &
-            infback.obj  inffast.obj  inflate.obj inftrees.obj   &
-            trees.obj    uncompr.obj  zutil.obj
-
-CC       = wcc386
-LINKER   = wcl386
-CFLAGS   = -zq -mf -3r -fp3 -s -bt=dos -oilrtfm -fr=nul -wx
-ZLIB_LIB = zlib_f.lib
-
-.C.OBJ:
-        $(CC) $(CFLAGS) $[@
-
-all: $(ZLIB_LIB) example.exe minigzip.exe
-
-$(ZLIB_LIB): $(OBJS)
-	wlib -b -c $(ZLIB_LIB) -+adler32.obj  -+compress.obj -+crc32.obj
-	wlib -b -c $(ZLIB_LIB) -+gzclose.obj  -+gzlib.obj    -+gzread.obj   -+gzwrite.obj
-        wlib -b -c $(ZLIB_LIB) -+deflate.obj  -+infback.obj
-        wlib -b -c $(ZLIB_LIB) -+inffast.obj  -+inflate.obj  -+inftrees.obj
-        wlib -b -c $(ZLIB_LIB) -+trees.obj    -+uncompr.obj  -+zutil.obj
-
-example.exe: $(ZLIB_LIB) example.obj
-	$(LINKER) -ldos32a -fe=example.exe example.obj $(ZLIB_LIB)
-
-minigzip.exe: $(ZLIB_LIB) minigzip.obj
-	$(LINKER) -ldos32a -fe=minigzip.exe minigzip.obj $(ZLIB_LIB)
-
-clean: .SYMBOLIC
-          del *.obj
-          del $(ZLIB_LIB)
-          @echo Cleaning done
diff --git a/src/png/zlib/watcom/watcom_l.mak b/src/png/zlib/watcom/watcom_l.mak
deleted file mode 100644
index 193eed7b3..000000000
--- a/src/png/zlib/watcom/watcom_l.mak
+++ /dev/null
@@ -1,43 +0,0 @@
-# Makefile for zlib
-# OpenWatcom large model
-# Last updated: 28-Dec-2005
-
-# To use, do "wmake -f watcom_l.mak"
-
-C_SOURCE =  adler32.c  compress.c crc32.c   deflate.c    &
-	    gzclose.c  gzlib.c    gzread.c  gzwrite.c    &
-            infback.c  inffast.c  inflate.c inftrees.c   &
-            trees.c    uncompr.c  zutil.c
-
-OBJS =      adler32.obj  compress.obj crc32.obj   deflate.obj    &
-	    gzclose.obj  gzlib.obj    gzread.obj  gzwrite.obj    &
-            infback.obj  inffast.obj  inflate.obj inftrees.obj   &
-            trees.obj    uncompr.obj  zutil.obj
-
-CC       = wcc
-LINKER   = wcl
-CFLAGS   = -zq -ml -s -bt=dos -oilrtfm -fr=nul -wx
-ZLIB_LIB = zlib_l.lib
-
-.C.OBJ:
-        $(CC) $(CFLAGS) $[@
-
-all: $(ZLIB_LIB) example.exe minigzip.exe
-
-$(ZLIB_LIB): $(OBJS)
-	wlib -b -c $(ZLIB_LIB) -+adler32.obj  -+compress.obj -+crc32.obj
-	wlib -b -c $(ZLIB_LIB) -+gzclose.obj  -+gzlib.obj    -+gzread.obj   -+gzwrite.obj
-        wlib -b -c $(ZLIB_LIB) -+deflate.obj  -+infback.obj
-        wlib -b -c $(ZLIB_LIB) -+inffast.obj  -+inflate.obj  -+inftrees.obj
-        wlib -b -c $(ZLIB_LIB) -+trees.obj    -+uncompr.obj  -+zutil.obj
-
-example.exe: $(ZLIB_LIB) example.obj
-	$(LINKER) -fe=example.exe example.obj $(ZLIB_LIB)
-
-minigzip.exe: $(ZLIB_LIB) minigzip.obj
-	$(LINKER) -fe=minigzip.exe minigzip.obj $(ZLIB_LIB)
-
-clean: .SYMBOLIC
-          del *.obj
-          del $(ZLIB_LIB)
-          @echo Cleaning done
diff --git a/src/png/zlib/win32/DLL_FAQ.txt b/src/png/zlib/win32/DLL_FAQ.txt
deleted file mode 100644
index 12c009018..000000000
--- a/src/png/zlib/win32/DLL_FAQ.txt
+++ /dev/null
@@ -1,397 +0,0 @@
-
-            Frequently Asked Questions about ZLIB1.DLL
-
-
-This document describes the design, the rationale, and the usage
-of the official DLL build of zlib, named ZLIB1.DLL.  If you have
-general questions about zlib, you should see the file "FAQ" found
-in the zlib distribution, or at the following location:
-  http://www.gzip.org/zlib/zlib_faq.html
-
-
- 1. What is ZLIB1.DLL, and how can I get it?
-
-  - ZLIB1.DLL is the official build of zlib as a DLL.
-    (Please remark the character '1' in the name.)
-
-    Pointers to a precompiled ZLIB1.DLL can be found in the zlib
-    web site at:
-      http://www.zlib.net/
-
-    Applications that link to ZLIB1.DLL can rely on the following
-    specification:
-
-    * The exported symbols are exclusively defined in the source
-      files "zlib.h" and "zlib.def", found in an official zlib
-      source distribution.
-    * The symbols are exported by name, not by ordinal.
-    * The exported names are undecorated.
-    * The calling convention of functions is "C" (CDECL).
-    * The ZLIB1.DLL binary is linked to MSVCRT.DLL.
-
-    The archive in which ZLIB1.DLL is bundled contains compiled
-    test programs that must run with a valid build of ZLIB1.DLL.
-    It is recommended to download the prebuilt DLL from the zlib
-    web site, instead of building it yourself, to avoid potential
-    incompatibilities that could be introduced by your compiler
-    and build settings.  If you do build the DLL yourself, please
-    make sure that it complies with all the above requirements,
-    and it runs with the precompiled test programs, bundled with
-    the original ZLIB1.DLL distribution.
-
-    If, for any reason, you need to build an incompatible DLL,
-    please use a different file name.
-
-
- 2. Why did you change the name of the DLL to ZLIB1.DLL?
-    What happened to the old ZLIB.DLL?
-
-  - The old ZLIB.DLL, built from zlib-1.1.4 or earlier, required
-    compilation settings that were incompatible to those used by
-    a static build.  The DLL settings were supposed to be enabled
-    by defining the macro ZLIB_DLL, before including "zlib.h".
-    Incorrect handling of this macro was silently accepted at
-    build time, resulting in two major problems:
-
-    * ZLIB_DLL was missing from the old makefile.  When building
-      the DLL, not all people added it to the build options.  In
-      consequence, incompatible incarnations of ZLIB.DLL started
-      to circulate around the net.
-
-    * When switching from using the static library to using the
-      DLL, applications had to define the ZLIB_DLL macro and
-      to recompile all the sources that contained calls to zlib
-      functions.  Failure to do so resulted in creating binaries
-      that were unable to run with the official ZLIB.DLL build.
-
-    The only possible solution that we could foresee was to make
-    a binary-incompatible change in the DLL interface, in order to
-    remove the dependency on the ZLIB_DLL macro, and to release
-    the new DLL under a different name.
-
-    We chose the name ZLIB1.DLL, where '1' indicates the major
-    zlib version number.  We hope that we will not have to break
-    the binary compatibility again, at least not as long as the
-    zlib-1.x series will last.
-
-    There is still a ZLIB_DLL macro, that can trigger a more
-    efficient build and use of the DLL, but compatibility no
-    longer dependents on it.
-
-
- 3. Can I build ZLIB.DLL from the new zlib sources, and replace
-    an old ZLIB.DLL, that was built from zlib-1.1.4 or earlier?
-
-  - In principle, you can do it by assigning calling convention
-    keywords to the macros ZEXPORT and ZEXPORTVA.  In practice,
-    it depends on what you mean by "an old ZLIB.DLL", because the
-    old DLL exists in several mutually-incompatible versions.
-    You have to find out first what kind of calling convention is
-    being used in your particular ZLIB.DLL build, and to use the
-    same one in the new build.  If you don't know what this is all
-    about, you might be better off if you would just leave the old
-    DLL intact.
-
-
- 4. Can I compile my application using the new zlib interface, and
-    link it to an old ZLIB.DLL, that was built from zlib-1.1.4 or
-    earlier?
-
-  - The official answer is "no"; the real answer depends again on
-    what kind of ZLIB.DLL you have.  Even if you are lucky, this
-    course of action is unreliable.
-
-    If you rebuild your application and you intend to use a newer
-    version of zlib (post- 1.1.4), it is strongly recommended to
-    link it to the new ZLIB1.DLL.
-
-
- 5. Why are the zlib symbols exported by name, and not by ordinal?
-
-  - Although exporting symbols by ordinal is a little faster, it
-    is risky.  Any single glitch in the maintenance or use of the
-    DEF file that contains the ordinals can result in incompatible
-    builds and frustrating crashes.  Simply put, the benefits of
-    exporting symbols by ordinal do not justify the risks.
-
-    Technically, it should be possible to maintain ordinals in
-    the DEF file, and still export the symbols by name.  Ordinals
-    exist in every DLL, and even if the dynamic linking performed
-    at the DLL startup is searching for names, ordinals serve as
-    hints, for a faster name lookup.  However, if the DEF file
-    contains ordinals, the Microsoft linker automatically builds
-    an implib that will cause the executables linked to it to use
-    those ordinals, and not the names.  It is interesting to
-    notice that the GNU linker for Win32 does not suffer from this
-    problem.
-
-    It is possible to avoid the DEF file if the exported symbols
-    are accompanied by a "__declspec(dllexport)" attribute in the
-    source files.  You can do this in zlib by predefining the
-    ZLIB_DLL macro.
-
-
- 6. I see that the ZLIB1.DLL functions use the "C" (CDECL) calling
-    convention.  Why not use the STDCALL convention?
-    STDCALL is the standard convention in Win32, and I need it in
-    my Visual Basic project!
-
-    (For readability, we use CDECL to refer to the convention
-     triggered by the "__cdecl" keyword, STDCALL to refer to
-     the convention triggered by "__stdcall", and FASTCALL to
-     refer to the convention triggered by "__fastcall".)
-
-  - Most of the native Windows API functions (without varargs) use
-    indeed the WINAPI convention (which translates to STDCALL in
-    Win32), but the standard C functions use CDECL.  If a user
-    application is intrinsically tied to the Windows API (e.g.
-    it calls native Windows API functions such as CreateFile()),
-    sometimes it makes sense to decorate its own functions with
-    WINAPI.  But if ANSI C or POSIX portability is a goal (e.g.
-    it calls standard C functions such as fopen()), it is not a
-    sound decision to request the inclusion of <windows.h>, or to
-    use non-ANSI constructs, for the sole purpose to make the user
-    functions STDCALL-able.
-
-    The functionality offered by zlib is not in the category of
-    "Windows functionality", but is more like "C functionality".
-
-    Technically, STDCALL is not bad; in fact, it is slightly
-    faster than CDECL, and it works with variable-argument
-    functions, just like CDECL.  It is unfortunate that, in spite
-    of using STDCALL in the Windows API, it is not the default
-    convention used by the C compilers that run under Windows.
-    The roots of the problem reside deep inside the unsafety of
-    the K&R-style function prototypes, where the argument types
-    are not specified; but that is another story for another day.
-
-    The remaining fact is that CDECL is the default convention.
-    Even if an explicit convention is hard-coded into the function
-    prototypes inside C headers, problems may appear.  The
-    necessity to expose the convention in users' callbacks is one
-    of these problems.
-
-    The calling convention issues are also important when using
-    zlib in other programming languages.  Some of them, like Ada
-    (GNAT) and Fortran (GNU G77), have C bindings implemented
-    initially on Unix, and relying on the C calling convention.
-    On the other hand, the pre- .NET versions of Microsoft Visual
-    Basic require STDCALL, while Borland Delphi prefers, although
-    it does not require, FASTCALL.
-
-    In fairness to all possible uses of zlib outside the C
-    programming language, we choose the default "C" convention.
-    Anyone interested in different bindings or conventions is
-    encouraged to maintain specialized projects.  The "contrib/"
-    directory from the zlib distribution already holds a couple
-    of foreign bindings, such as Ada, C++, and Delphi.
-
-
- 7. I need a DLL for my Visual Basic project.  What can I do?
-
-  - Define the ZLIB_WINAPI macro before including "zlib.h", when
-    building both the DLL and the user application (except that
-    you don't need to define anything when using the DLL in Visual
-    Basic).  The ZLIB_WINAPI macro will switch on the WINAPI
-    (STDCALL) convention.  The name of this DLL must be different
-    than the official ZLIB1.DLL.
-
-    Gilles Vollant has contributed a build named ZLIBWAPI.DLL,
-    with the ZLIB_WINAPI macro turned on, and with the minizip
-    functionality built in.  For more information, please read
-    the notes inside "contrib/vstudio/readme.txt", found in the
-    zlib distribution.
-
-
- 8. I need to use zlib in my Microsoft .NET project.  What can I
-    do?
-
-  - Henrik Ravn has contributed a .NET wrapper around zlib.  Look
-    into contrib/dotzlib/, inside the zlib distribution.
-
-
- 9. If my application uses ZLIB1.DLL, should I link it to
-    MSVCRT.DLL?  Why?
-
-  - It is not required, but it is recommended to link your
-    application to MSVCRT.DLL, if it uses ZLIB1.DLL.
-
-    The executables (.EXE, .DLL, etc.) that are involved in the
-    same process and are using the C run-time library (i.e. they
-    are calling standard C functions), must link to the same
-    library.  There are several libraries in the Win32 system:
-    CRTDLL.DLL, MSVCRT.DLL, the static C libraries, etc.
-    Since ZLIB1.DLL is linked to MSVCRT.DLL, the executables that
-    depend on it should also be linked to MSVCRT.DLL.
-
-
-10. Why are you saying that ZLIB1.DLL and my application should
-    be linked to the same C run-time (CRT) library?  I linked my
-    application and my DLLs to different C libraries (e.g. my
-    application to a static library, and my DLLs to MSVCRT.DLL),
-    and everything works fine.
-
-  - If a user library invokes only pure Win32 API (accessible via
-    <windows.h> and the related headers), its DLL build will work
-    in any context.  But if this library invokes standard C API,
-    things get more complicated.
-
-    There is a single Win32 library in a Win32 system.  Every
-    function in this library resides in a single DLL module, that
-    is safe to call from anywhere.  On the other hand, there are
-    multiple versions of the C library, and each of them has its
-    own separate internal state.  Standalone executables and user
-    DLLs that call standard C functions must link to a C run-time
-    (CRT) library, be it static or shared (DLL).  Intermixing
-    occurs when an executable (not necessarily standalone) and a
-    DLL are linked to different CRTs, and both are running in the
-    same process.
-
-    Intermixing multiple CRTs is possible, as long as their
-    internal states are kept intact.  The Microsoft Knowledge Base
-    articles KB94248 "HOWTO: Use the C Run-Time" and KB140584
-    "HOWTO: Link with the Correct C Run-Time (CRT) Library"
-    mention the potential problems raised by intermixing.
-
-    If intermixing works for you, it's because your application
-    and DLLs are avoiding the corruption of each of the CRTs'
-    internal states, maybe by careful design, or maybe by fortune.
-
-    Also note that linking ZLIB1.DLL to non-Microsoft CRTs, such
-    as those provided by Borland, raises similar problems.
-
-
-11. Why are you linking ZLIB1.DLL to MSVCRT.DLL?
-
-  - MSVCRT.DLL exists on every Windows 95 with a new service pack
-    installed, or with Microsoft Internet Explorer 4 or later, and
-    on all other Windows 4.x or later (Windows 98, Windows NT 4,
-    or later).  It is freely distributable; if not present in the
-    system, it can be downloaded from Microsoft or from other
-    software provider for free.
-
-    The fact that MSVCRT.DLL does not exist on a virgin Windows 95
-    is not so problematic.  Windows 95 is scarcely found nowadays,
-    Microsoft ended its support a long time ago, and many recent
-    applications from various vendors, including Microsoft, do not
-    even run on it.  Furthermore, no serious user should run
-    Windows 95 without a proper update installed.
-
-
-12. Why are you not linking ZLIB1.DLL to
-    <<my favorite C run-time library>> ?
-
-  - We considered and abandoned the following alternatives:
-
-    * Linking ZLIB1.DLL to a static C library (LIBC.LIB, or
-      LIBCMT.LIB) is not a good option.  People are using the DLL
-      mainly to save disk space.  If you are linking your program
-      to a static C library, you may as well consider linking zlib
-      in statically, too.
-
-    * Linking ZLIB1.DLL to CRTDLL.DLL looks appealing, because
-      CRTDLL.DLL is present on every Win32 installation.
-      Unfortunately, it has a series of problems: it does not
-      work properly with Microsoft's C++ libraries, it does not
-      provide support for 64-bit file offsets, (and so on...),
-      and Microsoft discontinued its support a long time ago.
-
-    * Linking ZLIB1.DLL to MSVCR70.DLL or MSVCR71.DLL, supplied
-      with the Microsoft .NET platform, and Visual C++ 7.0/7.1,
-      raises problems related to the status of ZLIB1.DLL as a
-      system component.  According to the Microsoft Knowledge Base
-      article KB326922 "INFO: Redistribution of the Shared C
-      Runtime Component in Visual C++ .NET", MSVCR70.DLL and
-      MSVCR71.DLL are not supposed to function as system DLLs,
-      because they may clash with MSVCRT.DLL.  Instead, the
-      application's installer is supposed to put these DLLs
-      (if needed) in the application's private directory.
-      If ZLIB1.DLL depends on a non-system runtime, it cannot
-      function as a redistributable system component.
-
-    * Linking ZLIB1.DLL to non-Microsoft runtimes, such as
-      Borland's, or Cygwin's, raises problems related to the
-      reliable presence of these runtimes on Win32 systems.
-      It's easier to let the DLL build of zlib up to the people
-      who distribute these runtimes, and who may proceed as
-      explained in the answer to Question 14.
-
-
-13. If ZLIB1.DLL cannot be linked to MSVCR70.DLL or MSVCR71.DLL,
-    how can I build/use ZLIB1.DLL in Microsoft Visual C++ 7.0
-    (Visual Studio .NET) or newer?
-
-  - Due to the problems explained in the Microsoft Knowledge Base
-    article KB326922 (see the previous answer), the C runtime that
-    comes with the VC7 environment is no longer considered a
-    system component.  That is, it should not be assumed that this
-    runtime exists, or may be installed in a system directory.
-    Since ZLIB1.DLL is supposed to be a system component, it may
-    not depend on a non-system component.
-
-    In order to link ZLIB1.DLL and your application to MSVCRT.DLL
-    in VC7, you need the library of Visual C++ 6.0 or older.  If
-    you don't have this library at hand, it's probably best not to
-    use ZLIB1.DLL.
-
-    We are hoping that, in the future, Microsoft will provide a
-    way to build applications linked to a proper system runtime,
-    from the Visual C++ environment.  Until then, you have a
-    couple of alternatives, such as linking zlib in statically.
-    If your application requires dynamic linking, you may proceed
-    as explained in the answer to Question 14.
-
-
-14. I need to link my own DLL build to a CRT different than
-    MSVCRT.DLL.  What can I do?
-
-  - Feel free to rebuild the DLL from the zlib sources, and link
-    it the way you want.  You should, however, clearly state that
-    your build is unofficial.  You should give it a different file
-    name, and/or install it in a private directory that can be
-    accessed by your application only, and is not visible to the
-    others (i.e. it's neither in the PATH, nor in the SYSTEM or
-    SYSTEM32 directories).  Otherwise, your build may clash with
-    applications that link to the official build.
-
-    For example, in Cygwin, zlib is linked to the Cygwin runtime
-    CYGWIN1.DLL, and it is distributed under the name CYGZ.DLL.
-
-
-15. May I include additional pieces of code that I find useful,
-    link them in ZLIB1.DLL, and export them?
-
-  - No.  A legitimate build of ZLIB1.DLL must not include code
-    that does not originate from the official zlib source code.
-    But you can make your own private DLL build, under a different
-    file name, as suggested in the previous answer.
-
-    For example, zlib is a part of the VCL library, distributed
-    with Borland Delphi and C++ Builder.  The DLL build of VCL
-    is a redistributable file, named VCLxx.DLL.
-
-
-16. May I remove some functionality out of ZLIB1.DLL, by enabling
-    macros like NO_GZCOMPRESS or NO_GZIP at compile time?
-
-  - No.  A legitimate build of ZLIB1.DLL must provide the complete
-    zlib functionality, as implemented in the official zlib source
-    code.  But you can make your own private DLL build, under a
-    different file name, as suggested in the previous answer.
-
-
-17. I made my own ZLIB1.DLL build.  Can I test it for compliance?
-
-  - We prefer that you download the official DLL from the zlib
-    web site.  If you need something peculiar from this DLL, you
-    can send your suggestion to the zlib mailing list.
-
-    However, in case you do rebuild the DLL yourself, you can run
-    it with the test programs found in the DLL distribution.
-    Running these test programs is not a guarantee of compliance,
-    but a failure can imply a detected problem.
-
-**
-
-This document is written and maintained by
-Cosmin Truta <cosmint@cs.ubbcluj.ro>
diff --git a/src/png/zlib/win32/Makefile.bor b/src/png/zlib/win32/Makefile.bor
deleted file mode 100644
index d152bbb7f..000000000
--- a/src/png/zlib/win32/Makefile.bor
+++ /dev/null
@@ -1,110 +0,0 @@
-# Makefile for zlib
-# Borland C++ for Win32
-#
-# Usage:
-#  make -f win32/Makefile.bor
-#  make -f win32/Makefile.bor LOCAL_ZLIB=-DASMV OBJA=match.obj OBJPA=+match.obj
-
-# ------------ Borland C++ ------------
-
-# Optional nonstandard preprocessor flags (e.g. -DMAX_MEM_LEVEL=7)
-# should be added to the environment via "set LOCAL_ZLIB=-DFOO" or
-# added to the declaration of LOC here:
-LOC = $(LOCAL_ZLIB)
-
-CC = bcc32
-AS = bcc32
-LD = bcc32
-AR = tlib
-CFLAGS  = -a -d -k- -O2 $(LOC)
-ASFLAGS = $(LOC)
-LDFLAGS = $(LOC)
-
-
-# variables
-ZLIB_LIB = zlib.lib
-
-OBJ1 = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj
-OBJ2 = gzwrite.obj infback.obj inffast.obj inflate.obj inftrees.obj trees.obj uncompr.obj zutil.obj
-#OBJA =
-OBJP1 = +adler32.obj+compress.obj+crc32.obj+deflate.obj+gzclose.obj+gzlib.obj+gzread.obj
-OBJP2 = +gzwrite.obj+infback.obj+inffast.obj+inflate.obj+inftrees.obj+trees.obj+uncompr.obj+zutil.obj
-#OBJPA=
-
-
-# targets
-all: $(ZLIB_LIB) example.exe minigzip.exe
-
-.c.obj:
-	$(CC) -c $(CFLAGS) $<
-
-.asm.obj:
-	$(AS) -c $(ASFLAGS) $<
-
-adler32.obj: adler32.c zlib.h zconf.h
-
-compress.obj: compress.c zlib.h zconf.h
-
-crc32.obj: crc32.c zlib.h zconf.h crc32.h
-
-deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
-
-gzclose.obj: gzclose.c zlib.h zconf.h gzguts.h
-
-gzlib.obj: gzlib.c zlib.h zconf.h gzguts.h
-
-gzread.obj: gzread.c zlib.h zconf.h gzguts.h
-
-gzwrite.obj: gzwrite.c zlib.h zconf.h gzguts.h
-
-infback.obj: infback.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h inffixed.h
-
-inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h
-
-inflate.obj: inflate.c zutil.h zlib.h zconf.h inftrees.h inflate.h \
- inffast.h inffixed.h
-
-inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
-
-trees.obj: trees.c zutil.h zlib.h zconf.h deflate.h trees.h
-
-uncompr.obj: uncompr.c zlib.h zconf.h
-
-zutil.obj: zutil.c zutil.h zlib.h zconf.h
-
-example.obj: test/example.c zlib.h zconf.h
-
-minigzip.obj: test/minigzip.c zlib.h zconf.h
-
-
-# For the sake of the old Borland make,
-# the command line is cut to fit in the MS-DOS 128 byte limit:
-$(ZLIB_LIB): $(OBJ1) $(OBJ2) $(OBJA)
-	-del $(ZLIB_LIB)
-	$(AR) $(ZLIB_LIB) $(OBJP1)
-	$(AR) $(ZLIB_LIB) $(OBJP2)
-	$(AR) $(ZLIB_LIB) $(OBJPA)
-
-
-# testing
-test: example.exe minigzip.exe
-	example
-	echo hello world | minigzip | minigzip -d
-
-example.exe: example.obj $(ZLIB_LIB)
-	$(LD) $(LDFLAGS) example.obj $(ZLIB_LIB)
-
-minigzip.exe: minigzip.obj $(ZLIB_LIB)
-	$(LD) $(LDFLAGS) minigzip.obj $(ZLIB_LIB)
-
-
-# cleanup
-clean:
-	-del $(ZLIB_LIB)
-	-del *.obj
-	-del *.exe
-	-del *.tds
-	-del zlib.bak
-	-del foo.gz
diff --git a/src/png/zlib/win32/Makefile.gcc b/src/png/zlib/win32/Makefile.gcc
deleted file mode 100644
index 305be50af..000000000
--- a/src/png/zlib/win32/Makefile.gcc
+++ /dev/null
@@ -1,182 +0,0 @@
-# Makefile for zlib, derived from Makefile.dj2.
-# Modified for mingw32 by C. Spieler, 6/16/98.
-# Updated for zlib 1.2.x by Christian Spieler and Cosmin Truta, Mar-2003.
-# Last updated: Mar 2012.
-# Tested under Cygwin and MinGW.
-
-# Copyright (C) 1995-2003 Jean-loup Gailly.
-# For conditions of distribution and use, see copyright notice in zlib.h
-
-# To compile, or to compile and test, type from the top level zlib directory:
-#
-#   make -fwin32/Makefile.gcc;  make test testdll -fwin32/Makefile.gcc
-#
-# To use the asm code, type:
-#   cp contrib/asm?86/match.S ./match.S
-#   make LOC=-DASMV OBJA=match.o -fwin32/Makefile.gcc
-#
-# To install libz.a, zconf.h and zlib.h in the system directories, type:
-#
-#   make install -fwin32/Makefile.gcc
-#
-# BINARY_PATH, INCLUDE_PATH and LIBRARY_PATH must be set.
-#
-# To install the shared lib, append SHARED_MODE=1 to the make command :
-#
-#   make install -fwin32/Makefile.gcc SHARED_MODE=1
-
-# Note:
-# If the platform is *not* MinGW (e.g. it is Cygwin or UWIN),
-# the DLL name should be changed from "zlib1.dll".
-
-STATICLIB = libz.a
-SHAREDLIB = zlib1.dll
-IMPLIB    = libz.dll.a
-
-#
-# Set to 1 if shared object needs to be installed
-#
-SHARED_MODE=0
-
-#LOC = -DASMV
-#LOC = -DZLIB_DEBUG -g
-
-PREFIX =
-CC = $(PREFIX)gcc
-CFLAGS = $(LOC) -O3 -Wall
-
-AS = $(CC)
-ASFLAGS = $(LOC) -Wall
-
-LD = $(CC)
-LDFLAGS = $(LOC)
-
-AR = $(PREFIX)ar
-ARFLAGS = rcs
-
-RC = $(PREFIX)windres
-RCFLAGS = --define GCC_WINDRES
-
-STRIP = $(PREFIX)strip
-
-CP = cp -fp
-# If GNU install is available, replace $(CP) with install.
-INSTALL = $(CP)
-RM = rm -f
-
-prefix ?= /usr/local
-exec_prefix = $(prefix)
-
-OBJS = adler32.o compress.o crc32.o deflate.o gzclose.o gzlib.o gzread.o \
-       gzwrite.o infback.o inffast.o inflate.o inftrees.o trees.o uncompr.o zutil.o
-OBJA =
-
-all: $(STATICLIB) $(SHAREDLIB) $(IMPLIB) example.exe minigzip.exe example_d.exe minigzip_d.exe
-
-test: example.exe minigzip.exe
-	./example
-	echo hello world | ./minigzip | ./minigzip -d
-
-testdll: example_d.exe minigzip_d.exe
-	./example_d
-	echo hello world | ./minigzip_d | ./minigzip_d -d
-
-.c.o:
-	$(CC) $(CFLAGS) -c -o $@ $<
-
-.S.o:
-	$(AS) $(ASFLAGS) -c -o $@ $<
-
-$(STATICLIB): $(OBJS) $(OBJA)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(OBJA)
-
-$(IMPLIB): $(SHAREDLIB)
-
-$(SHAREDLIB): win32/zlib.def $(OBJS) $(OBJA) zlibrc.o
-	$(CC) -shared -Wl,--out-implib,$(IMPLIB) $(LDFLAGS) \
-	-o $@ win32/zlib.def $(OBJS) $(OBJA) zlibrc.o
-	$(STRIP) $@
-
-example.exe: example.o $(STATICLIB)
-	$(LD) $(LDFLAGS) -o $@ example.o $(STATICLIB)
-	$(STRIP) $@
-
-minigzip.exe: minigzip.o $(STATICLIB)
-	$(LD) $(LDFLAGS) -o $@ minigzip.o $(STATICLIB)
-	$(STRIP) $@
-
-example_d.exe: example.o $(IMPLIB)
-	$(LD) $(LDFLAGS) -o $@ example.o $(IMPLIB)
-	$(STRIP) $@
-
-minigzip_d.exe: minigzip.o $(IMPLIB)
-	$(LD) $(LDFLAGS) -o $@ minigzip.o $(IMPLIB)
-	$(STRIP) $@
-
-example.o: test/example.c zlib.h zconf.h
-	$(CC) $(CFLAGS) -I. -c -o $@ test/example.c
-
-minigzip.o: test/minigzip.c zlib.h zconf.h
-	$(CC) $(CFLAGS) -I. -c -o $@ test/minigzip.c
-
-zlibrc.o: win32/zlib1.rc
-	$(RC) $(RCFLAGS) -o $@ win32/zlib1.rc
-
-.PHONY: install uninstall clean
-
-install: zlib.h zconf.h $(STATICLIB) $(IMPLIB)
-	@if test -z "$(DESTDIR)$(INCLUDE_PATH)" -o -z "$(DESTDIR)$(LIBRARY_PATH)" -o -z "$(DESTDIR)$(BINARY_PATH)"; then \
-		echo INCLUDE_PATH, LIBRARY_PATH, and BINARY_PATH must be specified; \
-		exit 1; \
-	fi
-	-@mkdir -p '$(DESTDIR)$(INCLUDE_PATH)'
-	-@mkdir -p '$(DESTDIR)$(LIBRARY_PATH)' '$(DESTDIR)$(LIBRARY_PATH)'/pkgconfig
-	-if [ "$(SHARED_MODE)" = "1" ]; then \
-		mkdir -p '$(DESTDIR)$(BINARY_PATH)'; \
-		$(INSTALL) $(SHAREDLIB) '$(DESTDIR)$(BINARY_PATH)'; \
-		$(INSTALL) $(IMPLIB) '$(DESTDIR)$(LIBRARY_PATH)'; \
-	fi
-	-$(INSTALL) zlib.h '$(DESTDIR)$(INCLUDE_PATH)'
-	-$(INSTALL) zconf.h '$(DESTDIR)$(INCLUDE_PATH)'
-	-$(INSTALL) $(STATICLIB) '$(DESTDIR)$(LIBRARY_PATH)'
-	sed \
-		-e 's|@prefix@|${prefix}|g' \
-		-e 's|@exec_prefix@|${exec_prefix}|g' \
-		-e 's|@libdir@|$(LIBRARY_PATH)|g' \
-		-e 's|@sharedlibdir@|$(LIBRARY_PATH)|g' \
-		-e 's|@includedir@|$(INCLUDE_PATH)|g' \
-		-e 's|@VERSION@|'`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' zlib.h`'|g' \
-		zlib.pc.in > '$(DESTDIR)$(LIBRARY_PATH)'/pkgconfig/zlib.pc
-
-uninstall:
-	-if [ "$(SHARED_MODE)" = "1" ]; then \
-		$(RM) '$(DESTDIR)$(BINARY_PATH)'/$(SHAREDLIB); \
-		$(RM) '$(DESTDIR)$(LIBRARY_PATH)'/$(IMPLIB); \
-	fi
-	-$(RM) '$(DESTDIR)$(INCLUDE_PATH)'/zlib.h
-	-$(RM) '$(DESTDIR)$(INCLUDE_PATH)'/zconf.h
-	-$(RM) '$(DESTDIR)$(LIBRARY_PATH)'/$(STATICLIB)
-
-clean:
-	-$(RM) $(STATICLIB)
-	-$(RM) $(SHAREDLIB)
-	-$(RM) $(IMPLIB)
-	-$(RM) *.o
-	-$(RM) *.exe
-	-$(RM) foo.gz
-
-adler32.o: zlib.h zconf.h
-compress.o: zlib.h zconf.h
-crc32.o: crc32.h zlib.h zconf.h
-deflate.o: deflate.h zutil.h zlib.h zconf.h
-gzclose.o: zlib.h zconf.h gzguts.h
-gzlib.o: zlib.h zconf.h gzguts.h
-gzread.o: zlib.h zconf.h gzguts.h
-gzwrite.o: zlib.h zconf.h gzguts.h
-inffast.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
-inflate.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
-infback.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
-inftrees.o: zutil.h zlib.h zconf.h inftrees.h
-trees.o: deflate.h zutil.h zlib.h zconf.h trees.h
-uncompr.o: zlib.h zconf.h
-zutil.o: zutil.h zlib.h zconf.h
diff --git a/src/png/zlib/win32/Makefile.msc b/src/png/zlib/win32/Makefile.msc
deleted file mode 100644
index 6831882de..000000000
--- a/src/png/zlib/win32/Makefile.msc
+++ /dev/null
@@ -1,163 +0,0 @@
-# Makefile for zlib using Microsoft (Visual) C
-# zlib is copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
-#
-# Usage:
-#   nmake -f win32/Makefile.msc                          (standard build)
-#   nmake -f win32/Makefile.msc LOC=-DFOO                (nonstandard build)
-#   nmake -f win32/Makefile.msc LOC="-DASMV -DASMINF" \
-#         OBJA="inffas32.obj match686.obj"               (use ASM code, x86)
-#   nmake -f win32/Makefile.msc AS=ml64 LOC="-DASMV -DASMINF -I." \
-#         OBJA="inffasx64.obj gvmat64.obj inffas8664.obj"  (use ASM code, x64)
-
-# The toplevel directory of the source tree.
-#
-TOP = .
-
-# optional build flags
-LOC =
-
-# variables
-STATICLIB = zlib.lib
-SHAREDLIB = zlib1.dll
-IMPLIB    = zdll.lib
-
-CC = cl
-AS = ml
-LD = link
-AR = lib
-RC = rc
-CFLAGS  = -nologo -MD -W3 -O2 -Oy- -Zi -Fd"zlib" $(LOC)
-WFLAGS  = -D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE
-ASFLAGS = -coff -Zi $(LOC)
-LDFLAGS = -nologo -debug -incremental:no -opt:ref
-ARFLAGS = -nologo
-RCFLAGS = /dWIN32 /r
-
-OBJS = adler32.obj compress.obj crc32.obj deflate.obj gzclose.obj gzlib.obj gzread.obj \
-       gzwrite.obj infback.obj inflate.obj inftrees.obj inffast.obj trees.obj uncompr.obj zutil.obj
-OBJA =
-
-
-# targets
-all: $(STATICLIB) $(SHAREDLIB) $(IMPLIB) \
-     example.exe minigzip.exe example_d.exe minigzip_d.exe
-
-$(STATICLIB): $(OBJS) $(OBJA)
-	$(AR) $(ARFLAGS) -out:$@ $(OBJS) $(OBJA)
-
-$(IMPLIB): $(SHAREDLIB)
-
-$(SHAREDLIB): $(TOP)/win32/zlib.def $(OBJS) $(OBJA) zlib1.res
-	$(LD) $(LDFLAGS) -def:$(TOP)/win32/zlib.def -dll -implib:$(IMPLIB) \
-	  -out:$@ -base:0x5A4C0000 $(OBJS) $(OBJA) zlib1.res
-	if exist $@.manifest \
-	  mt -nologo -manifest $@.manifest -outputresource:$@;2
-
-example.exe: example.obj $(STATICLIB)
-	$(LD) $(LDFLAGS) example.obj $(STATICLIB)
-	if exist $@.manifest \
-	  mt -nologo -manifest $@.manifest -outputresource:$@;1
-
-minigzip.exe: minigzip.obj $(STATICLIB)
-	$(LD) $(LDFLAGS) minigzip.obj $(STATICLIB)
-	if exist $@.manifest \
-	  mt -nologo -manifest $@.manifest -outputresource:$@;1
-
-example_d.exe: example.obj $(IMPLIB)
-	$(LD) $(LDFLAGS) -out:$@ example.obj $(IMPLIB)
-	if exist $@.manifest \
-	  mt -nologo -manifest $@.manifest -outputresource:$@;1
-
-minigzip_d.exe: minigzip.obj $(IMPLIB)
-	$(LD) $(LDFLAGS) -out:$@ minigzip.obj $(IMPLIB)
-	if exist $@.manifest \
-	  mt -nologo -manifest $@.manifest -outputresource:$@;1
-
-{$(TOP)}.c.obj:
-	$(CC) -c $(WFLAGS) $(CFLAGS) $<
-
-{$(TOP)/test}.c.obj:
-	$(CC) -c -I$(TOP) $(WFLAGS) $(CFLAGS) $<
-
-{$(TOP)/contrib/masmx64}.c.obj:
-	$(CC) -c $(WFLAGS) $(CFLAGS) $<
-
-{$(TOP)/contrib/masmx64}.asm.obj:
-	$(AS) -c $(ASFLAGS) $<
-
-{$(TOP)/contrib/masmx86}.asm.obj:
-	$(AS) -c $(ASFLAGS) $<
-
-adler32.obj: $(TOP)/adler32.c $(TOP)/zlib.h $(TOP)/zconf.h
-
-compress.obj: $(TOP)/compress.c $(TOP)/zlib.h $(TOP)/zconf.h
-
-crc32.obj: $(TOP)/crc32.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/crc32.h
-
-deflate.obj: $(TOP)/deflate.c $(TOP)/deflate.h $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h
-
-gzclose.obj: $(TOP)/gzclose.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/gzguts.h
-
-gzlib.obj: $(TOP)/gzlib.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/gzguts.h
-
-gzread.obj: $(TOP)/gzread.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/gzguts.h
-
-gzwrite.obj: $(TOP)/gzwrite.c $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/gzguts.h
-
-infback.obj: $(TOP)/infback.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/inftrees.h $(TOP)/inflate.h \
-             $(TOP)/inffast.h $(TOP)/inffixed.h
-
-inffast.obj: $(TOP)/inffast.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/inftrees.h $(TOP)/inflate.h \
-             $(TOP)/inffast.h
-
-inflate.obj: $(TOP)/inflate.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/inftrees.h $(TOP)/inflate.h \
-             $(TOP)/inffast.h $(TOP)/inffixed.h
-
-inftrees.obj: $(TOP)/inftrees.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/inftrees.h
-
-trees.obj: $(TOP)/trees.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h $(TOP)/deflate.h $(TOP)/trees.h
-
-uncompr.obj: $(TOP)/uncompr.c $(TOP)/zlib.h $(TOP)/zconf.h
-
-zutil.obj: $(TOP)/zutil.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h
-
-gvmat64.obj: $(TOP)/contrib\masmx64\gvmat64.asm
-
-inffasx64.obj: $(TOP)/contrib\masmx64\inffasx64.asm
-
-inffas8664.obj: $(TOP)/contrib\masmx64\inffas8664.c $(TOP)/zutil.h $(TOP)/zlib.h $(TOP)/zconf.h \
-		$(TOP)/inftrees.h $(TOP)/inflate.h $(TOP)/inffast.h
-
-inffas32.obj: $(TOP)/contrib\masmx86\inffas32.asm
-
-match686.obj: $(TOP)/contrib\masmx86\match686.asm
-
-example.obj: $(TOP)/test/example.c $(TOP)/zlib.h $(TOP)/zconf.h
-
-minigzip.obj: $(TOP)/test/minigzip.c $(TOP)/zlib.h $(TOP)/zconf.h
-
-zlib1.res: $(TOP)/win32/zlib1.rc
-	$(RC) $(RCFLAGS) /fo$@ $(TOP)/win32/zlib1.rc
-
-# testing
-test: example.exe minigzip.exe
-	example
-	echo hello world | minigzip | minigzip -d
-
-testdll: example_d.exe minigzip_d.exe
-	example_d
-	echo hello world | minigzip_d | minigzip_d -d
-
-
-# cleanup
-clean:
-	-del $(STATICLIB)
-	-del $(SHAREDLIB)
-	-del $(IMPLIB)
-	-del *.obj
-	-del *.res
-	-del *.exp
-	-del *.exe
-	-del *.pdb
-	-del *.manifest
-	-del foo.gz
diff --git a/src/png/zlib/win32/README-WIN32.txt b/src/png/zlib/win32/README-WIN32.txt
deleted file mode 100644
index df7ab7f4b..000000000
--- a/src/png/zlib/win32/README-WIN32.txt
+++ /dev/null
@@ -1,103 +0,0 @@
-ZLIB DATA COMPRESSION LIBRARY
-
-zlib 1.2.11 is a general purpose data compression library.  All the code is
-thread safe.  The data format used by the zlib library is described by RFCs
-(Request for Comments) 1950 to 1952 in the files
-http://www.ietf.org/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate format)
-and rfc1952.txt (gzip format).
-
-All functions of the compression library are documented in the file zlib.h
-(volunteer to write man pages welcome, contact zlib@gzip.org).  Two compiled
-examples are distributed in this package, example and minigzip.  The example_d
-and minigzip_d flavors validate that the zlib1.dll file is working correctly.
-
-Questions about zlib should be sent to <zlib@gzip.org>.  The zlib home page
-is http://zlib.net/ .  Before reporting a problem, please check this site to
-verify that you have the latest version of zlib; otherwise get the latest
-version and check whether the problem still exists or not.
-
-PLEASE read DLL_FAQ.txt, and the the zlib FAQ http://zlib.net/zlib_faq.html
-before asking for help.
-
-
-Manifest:
-
-The package zlib-1.2.11-win32-x86.zip will contain the following files:
-
-  README-WIN32.txt This document
-  ChangeLog        Changes since previous zlib packages
-  DLL_FAQ.txt      Frequently asked questions about zlib1.dll
-  zlib.3.pdf       Documentation of this library in Adobe Acrobat format
-
-  example.exe      A statically-bound example (using zlib.lib, not the dll)
-  example.pdb      Symbolic information for debugging example.exe
-
-  example_d.exe    A zlib1.dll bound example (using zdll.lib)
-  example_d.pdb    Symbolic information for debugging example_d.exe
-
-  minigzip.exe     A statically-bound test program (using zlib.lib, not the dll)
-  minigzip.pdb     Symbolic information for debugging minigzip.exe
-
-  minigzip_d.exe   A zlib1.dll bound test program (using zdll.lib)
-  minigzip_d.pdb   Symbolic information for debugging minigzip_d.exe
-
-  zlib.h           Install these files into the compilers' INCLUDE path to
-  zconf.h          compile programs which use zlib.lib or zdll.lib
-
-  zdll.lib         Install these files into the compilers' LIB path if linking
-  zdll.exp         a compiled program to the zlib1.dll binary
-
-  zlib.lib         Install these files into the compilers' LIB path to link zlib
-  zlib.pdb         into compiled programs, without zlib1.dll runtime dependency
-                   (zlib.pdb provides debugging info to the compile time linker)
-
-  zlib1.dll        Install this binary shared library into the system PATH, or
-                   the program's runtime directory (where the .exe resides)
-  zlib1.pdb        Install in the same directory as zlib1.dll, in order to debug
-                   an application crash using WinDbg or similar tools.
-
-All .pdb files above are entirely optional, but are very useful to a developer
-attempting to diagnose program misbehavior or a crash.  Many additional
-important files for developers can be found in the zlib127.zip source package
-available from http://zlib.net/ - review that package's README file for details.
-
-
-Acknowledgments:
-
-The deflate format used by zlib was defined by Phil Katz.  The deflate and
-zlib specifications were written by L.  Peter Deutsch.  Thanks to all the
-people who reported problems and suggested various improvements in zlib; they
-are too numerous to cite here.
-
-
-Copyright notice:
-
-  (C) 1995-2017 Jean-loup Gailly and Mark Adler
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the authors be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-
-  Jean-loup Gailly        Mark Adler
-  jloup@gzip.org          madler@alumni.caltech.edu
-
-If you use the zlib library in a product, we would appreciate *not* receiving
-lengthy legal documents to sign.  The sources are provided for free but without
-warranty of any kind.  The library has been entirely written by Jean-loup
-Gailly and Mark Adler; it does not include third-party code.
-
-If you redistribute modified sources, we would appreciate that you include in
-the file ChangeLog history information documenting your changes.  Please read
-the FAQ for more information on the distribution of modified source versions.
diff --git a/src/png/zlib/win32/VisualC.txt b/src/png/zlib/win32/VisualC.txt
deleted file mode 100644
index 1005b2194..000000000
--- a/src/png/zlib/win32/VisualC.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-
-To build zlib using the Microsoft Visual C++ environment,
-use the appropriate project from the contrib/vstudio/ directory.
diff --git a/src/png/zlib/win32/zlib.def b/src/png/zlib/win32/zlib.def
deleted file mode 100644
index a2188b000..000000000
--- a/src/png/zlib/win32/zlib.def
+++ /dev/null
@@ -1,94 +0,0 @@
-; zlib data compression library
-EXPORTS
-; basic functions
-    zlibVersion
-    deflate
-    deflateEnd
-    inflate
-    inflateEnd
-; advanced functions
-    deflateSetDictionary
-    deflateGetDictionary
-    deflateCopy
-    deflateReset
-    deflateParams
-    deflateTune
-    deflateBound
-    deflatePending
-    deflatePrime
-    deflateSetHeader
-    inflateSetDictionary
-    inflateGetDictionary
-    inflateSync
-    inflateCopy
-    inflateReset
-    inflateReset2
-    inflatePrime
-    inflateMark
-    inflateGetHeader
-    inflateBack
-    inflateBackEnd
-    zlibCompileFlags
-; utility functions
-    compress
-    compress2
-    compressBound
-    uncompress
-    uncompress2
-    gzopen
-    gzdopen
-    gzbuffer
-    gzsetparams
-    gzread
-    gzfread
-    gzwrite
-    gzfwrite
-    gzprintf
-    gzvprintf
-    gzputs
-    gzgets
-    gzputc
-    gzgetc
-    gzungetc
-    gzflush
-    gzseek
-    gzrewind
-    gztell
-    gzoffset
-    gzeof
-    gzdirect
-    gzclose
-    gzclose_r
-    gzclose_w
-    gzerror
-    gzclearerr
-; large file functions
-    gzopen64
-    gzseek64
-    gztell64
-    gzoffset64
-    adler32_combine64
-    crc32_combine64
-; checksum functions
-    adler32
-    adler32_z
-    crc32
-    crc32_z
-    adler32_combine
-    crc32_combine
-; various hacks, don't look :)
-    deflateInit_
-    deflateInit2_
-    inflateInit_
-    inflateInit2_
-    inflateBackInit_
-    gzgetc_
-    zError
-    inflateSyncPoint
-    get_crc_table
-    inflateUndermine
-    inflateValidate
-    inflateCodesUsed
-    inflateResetKeep
-    deflateResetKeep
-    gzopen_w
diff --git a/src/png/zlib/win32/zlib1.rc b/src/png/zlib/win32/zlib1.rc
deleted file mode 100644
index 234e641c3..000000000
--- a/src/png/zlib/win32/zlib1.rc
+++ /dev/null
@@ -1,40 +0,0 @@
-#include <winver.h>
-#include "../zlib.h"
-
-#ifdef GCC_WINDRES
-VS_VERSION_INFO		VERSIONINFO
-#else
-VS_VERSION_INFO		VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
-#endif
-  FILEVERSION		ZLIB_VER_MAJOR,ZLIB_VER_MINOR,ZLIB_VER_REVISION,0
-  PRODUCTVERSION	ZLIB_VER_MAJOR,ZLIB_VER_MINOR,ZLIB_VER_REVISION,0
-  FILEFLAGSMASK		VS_FFI_FILEFLAGSMASK
-#ifdef _DEBUG
-  FILEFLAGS		1
-#else
-  FILEFLAGS		0
-#endif
-  FILEOS		VOS__WINDOWS32
-  FILETYPE		VFT_DLL
-  FILESUBTYPE		0	// not used
-BEGIN
-  BLOCK "StringFileInfo"
-  BEGIN
-    BLOCK "040904E4"
-    //language ID = U.S. English, char set = Windows, Multilingual
-    BEGIN
-      VALUE "FileDescription",	"zlib data compression library\0"
-      VALUE "FileVersion",	ZLIB_VERSION "\0"
-      VALUE "InternalName",	"zlib1.dll\0"
-      VALUE "LegalCopyright",	"(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
-      VALUE "OriginalFilename",	"zlib1.dll\0"
-      VALUE "ProductName",	"zlib\0"
-      VALUE "ProductVersion",	ZLIB_VERSION "\0"
-      VALUE "Comments",		"For more information visit http://www.zlib.net/\0"
-    END
-  END
-  BLOCK "VarFileInfo"
-  BEGIN
-    VALUE "Translation", 0x0409, 1252
-  END
-END
diff --git a/src/png/zlib/zconf.h.cmakein b/src/png/zlib/zconf.h.cmakein
deleted file mode 100644
index a7f24cce6..000000000
--- a/src/png/zlib/zconf.h.cmakein
+++ /dev/null
@@ -1,536 +0,0 @@
-/* zconf.h -- configuration of the zlib compression library
- * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* @(#) $Id$ */
-
-#ifndef ZCONF_H
-#define ZCONF_H
-#cmakedefine Z_PREFIX
-#cmakedefine Z_HAVE_UNISTD_H
-
-/*
- * If you *really* need a unique prefix for all types and library functions,
- * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it.
- * Even better than compiling with -DZ_PREFIX would be to use configure to set
- * this permanently in zconf.h using "./configure --zprefix".
- */
-#ifdef Z_PREFIX     /* may be set to #if 1 by ./configure */
-#  define Z_PREFIX_SET
-
-/* all linked symbols and init macros */
-#  define _dist_code            z__dist_code
-#  define _length_code          z__length_code
-#  define _tr_align             z__tr_align
-#  define _tr_flush_bits        z__tr_flush_bits
-#  define _tr_flush_block       z__tr_flush_block
-#  define _tr_init              z__tr_init
-#  define _tr_stored_block      z__tr_stored_block
-#  define _tr_tally             z__tr_tally
-#  define adler32               z_adler32
-#  define adler32_combine       z_adler32_combine
-#  define adler32_combine64     z_adler32_combine64
-#  define adler32_z             z_adler32_z
-#  ifndef Z_SOLO
-#    define compress              z_compress
-#    define compress2             z_compress2
-#    define compressBound         z_compressBound
-#  endif
-#  define crc32                 z_crc32
-#  define crc32_combine         z_crc32_combine
-#  define crc32_combine64       z_crc32_combine64
-#  define crc32_z               z_crc32_z
-#  define deflate               z_deflate
-#  define deflateBound          z_deflateBound
-#  define deflateCopy           z_deflateCopy
-#  define deflateEnd            z_deflateEnd
-#  define deflateGetDictionary  z_deflateGetDictionary
-#  define deflateInit           z_deflateInit
-#  define deflateInit2          z_deflateInit2
-#  define deflateInit2_         z_deflateInit2_
-#  define deflateInit_          z_deflateInit_
-#  define deflateParams         z_deflateParams
-#  define deflatePending        z_deflatePending
-#  define deflatePrime          z_deflatePrime
-#  define deflateReset          z_deflateReset
-#  define deflateResetKeep      z_deflateResetKeep
-#  define deflateSetDictionary  z_deflateSetDictionary
-#  define deflateSetHeader      z_deflateSetHeader
-#  define deflateTune           z_deflateTune
-#  define deflate_copyright     z_deflate_copyright
-#  define get_crc_table         z_get_crc_table
-#  ifndef Z_SOLO
-#    define gz_error              z_gz_error
-#    define gz_intmax             z_gz_intmax
-#    define gz_strwinerror        z_gz_strwinerror
-#    define gzbuffer              z_gzbuffer
-#    define gzclearerr            z_gzclearerr
-#    define gzclose               z_gzclose
-#    define gzclose_r             z_gzclose_r
-#    define gzclose_w             z_gzclose_w
-#    define gzdirect              z_gzdirect
-#    define gzdopen               z_gzdopen
-#    define gzeof                 z_gzeof
-#    define gzerror               z_gzerror
-#    define gzflush               z_gzflush
-#    define gzfread               z_gzfread
-#    define gzfwrite              z_gzfwrite
-#    define gzgetc                z_gzgetc
-#    define gzgetc_               z_gzgetc_
-#    define gzgets                z_gzgets
-#    define gzoffset              z_gzoffset
-#    define gzoffset64            z_gzoffset64
-#    define gzopen                z_gzopen
-#    define gzopen64              z_gzopen64
-#    ifdef _WIN32
-#      define gzopen_w              z_gzopen_w
-#    endif
-#    define gzprintf              z_gzprintf
-#    define gzputc                z_gzputc
-#    define gzputs                z_gzputs
-#    define gzread                z_gzread
-#    define gzrewind              z_gzrewind
-#    define gzseek                z_gzseek
-#    define gzseek64              z_gzseek64
-#    define gzsetparams           z_gzsetparams
-#    define gztell                z_gztell
-#    define gztell64              z_gztell64
-#    define gzungetc              z_gzungetc
-#    define gzvprintf             z_gzvprintf
-#    define gzwrite               z_gzwrite
-#  endif
-#  define inflate               z_inflate
-#  define inflateBack           z_inflateBack
-#  define inflateBackEnd        z_inflateBackEnd
-#  define inflateBackInit       z_inflateBackInit
-#  define inflateBackInit_      z_inflateBackInit_
-#  define inflateCodesUsed      z_inflateCodesUsed
-#  define inflateCopy           z_inflateCopy
-#  define inflateEnd            z_inflateEnd
-#  define inflateGetDictionary  z_inflateGetDictionary
-#  define inflateGetHeader      z_inflateGetHeader
-#  define inflateInit           z_inflateInit
-#  define inflateInit2          z_inflateInit2
-#  define inflateInit2_         z_inflateInit2_
-#  define inflateInit_          z_inflateInit_
-#  define inflateMark           z_inflateMark
-#  define inflatePrime          z_inflatePrime
-#  define inflateReset          z_inflateReset
-#  define inflateReset2         z_inflateReset2
-#  define inflateResetKeep      z_inflateResetKeep
-#  define inflateSetDictionary  z_inflateSetDictionary
-#  define inflateSync           z_inflateSync
-#  define inflateSyncPoint      z_inflateSyncPoint
-#  define inflateUndermine      z_inflateUndermine
-#  define inflateValidate       z_inflateValidate
-#  define inflate_copyright     z_inflate_copyright
-#  define inflate_fast          z_inflate_fast
-#  define inflate_table         z_inflate_table
-#  ifndef Z_SOLO
-#    define uncompress            z_uncompress
-#    define uncompress2           z_uncompress2
-#  endif
-#  define zError                z_zError
-#  ifndef Z_SOLO
-#    define zcalloc               z_zcalloc
-#    define zcfree                z_zcfree
-#  endif
-#  define zlibCompileFlags      z_zlibCompileFlags
-#  define zlibVersion           z_zlibVersion
-
-/* all zlib typedefs in zlib.h and zconf.h */
-#  define Byte                  z_Byte
-#  define Bytef                 z_Bytef
-#  define alloc_func            z_alloc_func
-#  define charf                 z_charf
-#  define free_func             z_free_func
-#  ifndef Z_SOLO
-#    define gzFile                z_gzFile
-#  endif
-#  define gz_header             z_gz_header
-#  define gz_headerp            z_gz_headerp
-#  define in_func               z_in_func
-#  define intf                  z_intf
-#  define out_func              z_out_func
-#  define uInt                  z_uInt
-#  define uIntf                 z_uIntf
-#  define uLong                 z_uLong
-#  define uLongf                z_uLongf
-#  define voidp                 z_voidp
-#  define voidpc                z_voidpc
-#  define voidpf                z_voidpf
-
-/* all zlib structs in zlib.h and zconf.h */
-#  define gz_header_s           z_gz_header_s
-#  define internal_state        z_internal_state
-
-#endif
-
-#if defined(__MSDOS__) && !defined(MSDOS)
-#  define MSDOS
-#endif
-#if (defined(OS_2) || defined(__OS2__)) && !defined(OS2)
-#  define OS2
-#endif
-#if defined(_WINDOWS) && !defined(WINDOWS)
-#  define WINDOWS
-#endif
-#if defined(_WIN32) || defined(_WIN32_WCE) || defined(__WIN32__)
-#  ifndef WIN32
-#    define WIN32
-#  endif
-#endif
-#if (defined(MSDOS) || defined(OS2) || defined(WINDOWS)) && !defined(WIN32)
-#  if !defined(__GNUC__) && !defined(__FLAT__) && !defined(__386__)
-#    ifndef SYS16BIT
-#      define SYS16BIT
-#    endif
-#  endif
-#endif
-
-/*
- * Compile with -DMAXSEG_64K if the alloc function cannot allocate more
- * than 64k bytes at a time (needed on systems with 16-bit int).
- */
-#ifdef SYS16BIT
-#  define MAXSEG_64K
-#endif
-#ifdef MSDOS
-#  define UNALIGNED_OK
-#endif
-
-#ifdef __STDC_VERSION__
-#  ifndef STDC
-#    define STDC
-#  endif
-#  if __STDC_VERSION__ >= 199901L
-#    ifndef STDC99
-#      define STDC99
-#    endif
-#  endif
-#endif
-#if !defined(STDC) && (defined(__STDC__) || defined(__cplusplus))
-#  define STDC
-#endif
-#if !defined(STDC) && (defined(__GNUC__) || defined(__BORLANDC__))
-#  define STDC
-#endif
-#if !defined(STDC) && (defined(MSDOS) || defined(WINDOWS) || defined(WIN32))
-#  define STDC
-#endif
-#if !defined(STDC) && (defined(OS2) || defined(__HOS_AIX__))
-#  define STDC
-#endif
-
-#if defined(__OS400__) && !defined(STDC)    /* iSeries (formerly AS/400). */
-#  define STDC
-#endif
-
-#ifndef STDC
-#  ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */
-#    define const       /* note: need a more gentle solution here */
-#  endif
-#endif
-
-#if defined(ZLIB_CONST) && !defined(z_const)
-#  define z_const const
-#else
-#  define z_const
-#endif
-
-#ifdef Z_SOLO
-   typedef unsigned long z_size_t;
-#else
-#  define z_longlong long long
-#  if defined(NO_SIZE_T)
-     typedef unsigned NO_SIZE_T z_size_t;
-#  elif defined(STDC)
-#    include <stddef.h>
-     typedef size_t z_size_t;
-#  else
-     typedef unsigned long z_size_t;
-#  endif
-#  undef z_longlong
-#endif
-
-/* Maximum value for memLevel in deflateInit2 */
-#ifndef MAX_MEM_LEVEL
-#  ifdef MAXSEG_64K
-#    define MAX_MEM_LEVEL 8
-#  else
-#    define MAX_MEM_LEVEL 9
-#  endif
-#endif
-
-/* Maximum value for windowBits in deflateInit2 and inflateInit2.
- * WARNING: reducing MAX_WBITS makes minigzip unable to extract .gz files
- * created by gzip. (Files created by minigzip can still be extracted by
- * gzip.)
- */
-#ifndef MAX_WBITS
-#  define MAX_WBITS   15 /* 32K LZ77 window */
-#endif
-
-/* The memory requirements for deflate are (in bytes):
-            (1 << (windowBits+2)) +  (1 << (memLevel+9))
- that is: 128K for windowBits=15  +  128K for memLevel = 8  (default values)
- plus a few kilobytes for small objects. For example, if you want to reduce
- the default memory requirements from 256K to 128K, compile with
-     make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
- Of course this will generally degrade compression (there's no free lunch).
-
-   The memory requirements for inflate are (in bytes) 1 << windowBits
- that is, 32K for windowBits=15 (default value) plus about 7 kilobytes
- for small objects.
-*/
-
-                        /* Type declarations */
-
-#ifndef OF /* function prototypes */
-#  ifdef STDC
-#    define OF(args)  args
-#  else
-#    define OF(args)  ()
-#  endif
-#endif
-
-#ifndef Z_ARG /* function prototypes for stdarg */
-#  if defined(STDC) || defined(Z_HAVE_STDARG_H)
-#    define Z_ARG(args)  args
-#  else
-#    define Z_ARG(args)  ()
-#  endif
-#endif
-
-/* The following definitions for FAR are needed only for MSDOS mixed
- * model programming (small or medium model with some far allocations).
- * This was tested only with MSC; for other MSDOS compilers you may have
- * to define NO_MEMCPY in zutil.h.  If you don't need the mixed model,
- * just define FAR to be empty.
- */
-#ifdef SYS16BIT
-#  if defined(M_I86SM) || defined(M_I86MM)
-     /* MSC small or medium model */
-#    define SMALL_MEDIUM
-#    ifdef _MSC_VER
-#      define FAR _far
-#    else
-#      define FAR far
-#    endif
-#  endif
-#  if (defined(__SMALL__) || defined(__MEDIUM__))
-     /* Turbo C small or medium model */
-#    define SMALL_MEDIUM
-#    ifdef __BORLANDC__
-#      define FAR _far
-#    else
-#      define FAR far
-#    endif
-#  endif
-#endif
-
-#if defined(WINDOWS) || defined(WIN32)
-   /* If building or using zlib as a DLL, define ZLIB_DLL.
-    * This is not mandatory, but it offers a little performance increase.
-    */
-#  ifdef ZLIB_DLL
-#    if defined(WIN32) && (!defined(__BORLANDC__) || (__BORLANDC__ >= 0x500))
-#      ifdef ZLIB_INTERNAL
-#        define ZEXTERN extern __declspec(dllexport)
-#      else
-#        define ZEXTERN extern __declspec(dllimport)
-#      endif
-#    endif
-#  endif  /* ZLIB_DLL */
-   /* If building or using zlib with the WINAPI/WINAPIV calling convention,
-    * define ZLIB_WINAPI.
-    * Caution: the standard ZLIB1.DLL is NOT compiled using ZLIB_WINAPI.
-    */
-#  ifdef ZLIB_WINAPI
-#    ifdef FAR
-#      undef FAR
-#    endif
-#    include <windows.h>
-     /* No need for _export, use ZLIB.DEF instead. */
-     /* For complete Windows compatibility, use WINAPI, not __stdcall. */
-#    define ZEXPORT WINAPI
-#    ifdef WIN32
-#      define ZEXPORTVA WINAPIV
-#    else
-#      define ZEXPORTVA FAR CDECL
-#    endif
-#  endif
-#endif
-
-#if defined (__BEOS__)
-#  ifdef ZLIB_DLL
-#    ifdef ZLIB_INTERNAL
-#      define ZEXPORT   __declspec(dllexport)
-#      define ZEXPORTVA __declspec(dllexport)
-#    else
-#      define ZEXPORT   __declspec(dllimport)
-#      define ZEXPORTVA __declspec(dllimport)
-#    endif
-#  endif
-#endif
-
-#ifndef ZEXTERN
-#  define ZEXTERN extern
-#endif
-#ifndef ZEXPORT
-#  define ZEXPORT
-#endif
-#ifndef ZEXPORTVA
-#  define ZEXPORTVA
-#endif
-
-#ifndef FAR
-#  define FAR
-#endif
-
-#if !defined(__MACTYPES__)
-typedef unsigned char  Byte;  /* 8 bits */
-#endif
-typedef unsigned int   uInt;  /* 16 bits or more */
-typedef unsigned long  uLong; /* 32 bits or more */
-
-#ifdef SMALL_MEDIUM
-   /* Borland C/C++ and some old MSC versions ignore FAR inside typedef */
-#  define Bytef Byte FAR
-#else
-   typedef Byte  FAR Bytef;
-#endif
-typedef char  FAR charf;
-typedef int   FAR intf;
-typedef uInt  FAR uIntf;
-typedef uLong FAR uLongf;
-
-#ifdef STDC
-   typedef void const *voidpc;
-   typedef void FAR   *voidpf;
-   typedef void       *voidp;
-#else
-   typedef Byte const *voidpc;
-   typedef Byte FAR   *voidpf;
-   typedef Byte       *voidp;
-#endif
-
-#if !defined(Z_U4) && !defined(Z_SOLO) && defined(STDC)
-#  include <limits.h>
-#  if (UINT_MAX == 0xffffffffUL)
-#    define Z_U4 unsigned
-#  elif (ULONG_MAX == 0xffffffffUL)
-#    define Z_U4 unsigned long
-#  elif (USHRT_MAX == 0xffffffffUL)
-#    define Z_U4 unsigned short
-#  endif
-#endif
-
-#ifdef Z_U4
-   typedef Z_U4 z_crc_t;
-#else
-   typedef unsigned long z_crc_t;
-#endif
-
-#ifdef HAVE_UNISTD_H    /* may be set to #if 1 by ./configure */
-#  define Z_HAVE_UNISTD_H
-#endif
-
-#ifdef HAVE_STDARG_H    /* may be set to #if 1 by ./configure */
-#  define Z_HAVE_STDARG_H
-#endif
-
-#ifdef STDC
-#  ifndef Z_SOLO
-#    include <sys/types.h>      /* for off_t */
-#  endif
-#endif
-
-#if defined(STDC) || defined(Z_HAVE_STDARG_H)
-#  ifndef Z_SOLO
-#    include <stdarg.h>         /* for va_list */
-#  endif
-#endif
-
-#ifdef _WIN32
-#  ifndef Z_SOLO
-#    include <stddef.h>         /* for wchar_t */
-#  endif
-#endif
-
-/* a little trick to accommodate both "#define _LARGEFILE64_SOURCE" and
- * "#define _LARGEFILE64_SOURCE 1" as requesting 64-bit operations, (even
- * though the former does not conform to the LFS document), but considering
- * both "#undef _LARGEFILE64_SOURCE" and "#define _LARGEFILE64_SOURCE 0" as
- * equivalently requesting no 64-bit operations
- */
-#if defined(_LARGEFILE64_SOURCE) && -_LARGEFILE64_SOURCE - -1 == 1
-#  undef _LARGEFILE64_SOURCE
-#endif
-
-#if defined(__WATCOMC__) && !defined(Z_HAVE_UNISTD_H)
-#  define Z_HAVE_UNISTD_H
-#endif
-#ifndef Z_SOLO
-#  if defined(Z_HAVE_UNISTD_H) || defined(_LARGEFILE64_SOURCE)
-#    include <unistd.h>         /* for SEEK_*, off_t, and _LFS64_LARGEFILE */
-#    ifdef VMS
-#      include <unixio.h>       /* for off_t */
-#    endif
-#    ifndef z_off_t
-#      define z_off_t off_t
-#    endif
-#  endif
-#endif
-
-#if defined(_LFS64_LARGEFILE) && _LFS64_LARGEFILE-0
-#  define Z_LFS64
-#endif
-
-#if defined(_LARGEFILE64_SOURCE) && defined(Z_LFS64)
-#  define Z_LARGE64
-#endif
-
-#if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS-0 == 64 && defined(Z_LFS64)
-#  define Z_WANT64
-#endif
-
-#if !defined(SEEK_SET) && !defined(Z_SOLO)
-#  define SEEK_SET        0       /* Seek from beginning of file.  */
-#  define SEEK_CUR        1       /* Seek from current position.  */
-#  define SEEK_END        2       /* Set file pointer to EOF plus "offset" */
-#endif
-
-#ifndef z_off_t
-#  define z_off_t long
-#endif
-
-#if !defined(_WIN32) && defined(Z_LARGE64)
-#  define z_off64_t off64_t
-#else
-#  if defined(_WIN32) && !defined(__GNUC__) && !defined(Z_SOLO)
-#    define z_off64_t __int64
-#  else
-#    define z_off64_t z_off_t
-#  endif
-#endif
-
-/* MVS linker does not support external names larger than 8 bytes */
-#if defined(__MVS__)
-  #pragma map(deflateInit_,"DEIN")
-  #pragma map(deflateInit2_,"DEIN2")
-  #pragma map(deflateEnd,"DEEND")
-  #pragma map(deflateBound,"DEBND")
-  #pragma map(inflateInit_,"ININ")
-  #pragma map(inflateInit2_,"ININ2")
-  #pragma map(inflateEnd,"INEND")
-  #pragma map(inflateSync,"INSY")
-  #pragma map(inflateSetDictionary,"INSEDI")
-  #pragma map(compressBound,"CMBND")
-  #pragma map(inflate_table,"INTABL")
-  #pragma map(inflate_fast,"INFA")
-  #pragma map(inflate_copyright,"INCOPY")
-#endif
-
-#endif /* ZCONF_H */
diff --git a/src/png/zlib/zconf.h.in b/src/png/zlib/zconf.h.in
deleted file mode 100644
index 5e1d68a00..000000000
--- a/src/png/zlib/zconf.h.in
+++ /dev/null
@@ -1,534 +0,0 @@
-/* zconf.h -- configuration of the zlib compression library
- * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* @(#) $Id$ */
-
-#ifndef ZCONF_H
-#define ZCONF_H
-
-/*
- * If you *really* need a unique prefix for all types and library functions,
- * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it.
- * Even better than compiling with -DZ_PREFIX would be to use configure to set
- * this permanently in zconf.h using "./configure --zprefix".
- */
-#ifdef Z_PREFIX     /* may be set to #if 1 by ./configure */
-#  define Z_PREFIX_SET
-
-/* all linked symbols and init macros */
-#  define _dist_code            z__dist_code
-#  define _length_code          z__length_code
-#  define _tr_align             z__tr_align
-#  define _tr_flush_bits        z__tr_flush_bits
-#  define _tr_flush_block       z__tr_flush_block
-#  define _tr_init              z__tr_init
-#  define _tr_stored_block      z__tr_stored_block
-#  define _tr_tally             z__tr_tally
-#  define adler32               z_adler32
-#  define adler32_combine       z_adler32_combine
-#  define adler32_combine64     z_adler32_combine64
-#  define adler32_z             z_adler32_z
-#  ifndef Z_SOLO
-#    define compress              z_compress
-#    define compress2             z_compress2
-#    define compressBound         z_compressBound
-#  endif
-#  define crc32                 z_crc32
-#  define crc32_combine         z_crc32_combine
-#  define crc32_combine64       z_crc32_combine64
-#  define crc32_z               z_crc32_z
-#  define deflate               z_deflate
-#  define deflateBound          z_deflateBound
-#  define deflateCopy           z_deflateCopy
-#  define deflateEnd            z_deflateEnd
-#  define deflateGetDictionary  z_deflateGetDictionary
-#  define deflateInit           z_deflateInit
-#  define deflateInit2          z_deflateInit2
-#  define deflateInit2_         z_deflateInit2_
-#  define deflateInit_          z_deflateInit_
-#  define deflateParams         z_deflateParams
-#  define deflatePending        z_deflatePending
-#  define deflatePrime          z_deflatePrime
-#  define deflateReset          z_deflateReset
-#  define deflateResetKeep      z_deflateResetKeep
-#  define deflateSetDictionary  z_deflateSetDictionary
-#  define deflateSetHeader      z_deflateSetHeader
-#  define deflateTune           z_deflateTune
-#  define deflate_copyright     z_deflate_copyright
-#  define get_crc_table         z_get_crc_table
-#  ifndef Z_SOLO
-#    define gz_error              z_gz_error
-#    define gz_intmax             z_gz_intmax
-#    define gz_strwinerror        z_gz_strwinerror
-#    define gzbuffer              z_gzbuffer
-#    define gzclearerr            z_gzclearerr
-#    define gzclose               z_gzclose
-#    define gzclose_r             z_gzclose_r
-#    define gzclose_w             z_gzclose_w
-#    define gzdirect              z_gzdirect
-#    define gzdopen               z_gzdopen
-#    define gzeof                 z_gzeof
-#    define gzerror               z_gzerror
-#    define gzflush               z_gzflush
-#    define gzfread               z_gzfread
-#    define gzfwrite              z_gzfwrite
-#    define gzgetc                z_gzgetc
-#    define gzgetc_               z_gzgetc_
-#    define gzgets                z_gzgets
-#    define gzoffset              z_gzoffset
-#    define gzoffset64            z_gzoffset64
-#    define gzopen                z_gzopen
-#    define gzopen64              z_gzopen64
-#    ifdef _WIN32
-#      define gzopen_w              z_gzopen_w
-#    endif
-#    define gzprintf              z_gzprintf
-#    define gzputc                z_gzputc
-#    define gzputs                z_gzputs
-#    define gzread                z_gzread
-#    define gzrewind              z_gzrewind
-#    define gzseek                z_gzseek
-#    define gzseek64              z_gzseek64
-#    define gzsetparams           z_gzsetparams
-#    define gztell                z_gztell
-#    define gztell64              z_gztell64
-#    define gzungetc              z_gzungetc
-#    define gzvprintf             z_gzvprintf
-#    define gzwrite               z_gzwrite
-#  endif
-#  define inflate               z_inflate
-#  define inflateBack           z_inflateBack
-#  define inflateBackEnd        z_inflateBackEnd
-#  define inflateBackInit       z_inflateBackInit
-#  define inflateBackInit_      z_inflateBackInit_
-#  define inflateCodesUsed      z_inflateCodesUsed
-#  define inflateCopy           z_inflateCopy
-#  define inflateEnd            z_inflateEnd
-#  define inflateGetDictionary  z_inflateGetDictionary
-#  define inflateGetHeader      z_inflateGetHeader
-#  define inflateInit           z_inflateInit
-#  define inflateInit2          z_inflateInit2
-#  define inflateInit2_         z_inflateInit2_
-#  define inflateInit_          z_inflateInit_
-#  define inflateMark           z_inflateMark
-#  define inflatePrime          z_inflatePrime
-#  define inflateReset          z_inflateReset
-#  define inflateReset2         z_inflateReset2
-#  define inflateResetKeep      z_inflateResetKeep
-#  define inflateSetDictionary  z_inflateSetDictionary
-#  define inflateSync           z_inflateSync
-#  define inflateSyncPoint      z_inflateSyncPoint
-#  define inflateUndermine      z_inflateUndermine
-#  define inflateValidate       z_inflateValidate
-#  define inflate_copyright     z_inflate_copyright
-#  define inflate_fast          z_inflate_fast
-#  define inflate_table         z_inflate_table
-#  ifndef Z_SOLO
-#    define uncompress            z_uncompress
-#    define uncompress2           z_uncompress2
-#  endif
-#  define zError                z_zError
-#  ifndef Z_SOLO
-#    define zcalloc               z_zcalloc
-#    define zcfree                z_zcfree
-#  endif
-#  define zlibCompileFlags      z_zlibCompileFlags
-#  define zlibVersion           z_zlibVersion
-
-/* all zlib typedefs in zlib.h and zconf.h */
-#  define Byte                  z_Byte
-#  define Bytef                 z_Bytef
-#  define alloc_func            z_alloc_func
-#  define charf                 z_charf
-#  define free_func             z_free_func
-#  ifndef Z_SOLO
-#    define gzFile                z_gzFile
-#  endif
-#  define gz_header             z_gz_header
-#  define gz_headerp            z_gz_headerp
-#  define in_func               z_in_func
-#  define intf                  z_intf
-#  define out_func              z_out_func
-#  define uInt                  z_uInt
-#  define uIntf                 z_uIntf
-#  define uLong                 z_uLong
-#  define uLongf                z_uLongf
-#  define voidp                 z_voidp
-#  define voidpc                z_voidpc
-#  define voidpf                z_voidpf
-
-/* all zlib structs in zlib.h and zconf.h */
-#  define gz_header_s           z_gz_header_s
-#  define internal_state        z_internal_state
-
-#endif
-
-#if defined(__MSDOS__) && !defined(MSDOS)
-#  define MSDOS
-#endif
-#if (defined(OS_2) || defined(__OS2__)) && !defined(OS2)
-#  define OS2
-#endif
-#if defined(_WINDOWS) && !defined(WINDOWS)
-#  define WINDOWS
-#endif
-#if defined(_WIN32) || defined(_WIN32_WCE) || defined(__WIN32__)
-#  ifndef WIN32
-#    define WIN32
-#  endif
-#endif
-#if (defined(MSDOS) || defined(OS2) || defined(WINDOWS)) && !defined(WIN32)
-#  if !defined(__GNUC__) && !defined(__FLAT__) && !defined(__386__)
-#    ifndef SYS16BIT
-#      define SYS16BIT
-#    endif
-#  endif
-#endif
-
-/*
- * Compile with -DMAXSEG_64K if the alloc function cannot allocate more
- * than 64k bytes at a time (needed on systems with 16-bit int).
- */
-#ifdef SYS16BIT
-#  define MAXSEG_64K
-#endif
-#ifdef MSDOS
-#  define UNALIGNED_OK
-#endif
-
-#ifdef __STDC_VERSION__
-#  ifndef STDC
-#    define STDC
-#  endif
-#  if __STDC_VERSION__ >= 199901L
-#    ifndef STDC99
-#      define STDC99
-#    endif
-#  endif
-#endif
-#if !defined(STDC) && (defined(__STDC__) || defined(__cplusplus))
-#  define STDC
-#endif
-#if !defined(STDC) && (defined(__GNUC__) || defined(__BORLANDC__))
-#  define STDC
-#endif
-#if !defined(STDC) && (defined(MSDOS) || defined(WINDOWS) || defined(WIN32))
-#  define STDC
-#endif
-#if !defined(STDC) && (defined(OS2) || defined(__HOS_AIX__))
-#  define STDC
-#endif
-
-#if defined(__OS400__) && !defined(STDC)    /* iSeries (formerly AS/400). */
-#  define STDC
-#endif
-
-#ifndef STDC
-#  ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */
-#    define const       /* note: need a more gentle solution here */
-#  endif
-#endif
-
-#if defined(ZLIB_CONST) && !defined(z_const)
-#  define z_const const
-#else
-#  define z_const
-#endif
-
-#ifdef Z_SOLO
-   typedef unsigned long z_size_t;
-#else
-#  define z_longlong long long
-#  if defined(NO_SIZE_T)
-     typedef unsigned NO_SIZE_T z_size_t;
-#  elif defined(STDC)
-#    include <stddef.h>
-     typedef size_t z_size_t;
-#  else
-     typedef unsigned long z_size_t;
-#  endif
-#  undef z_longlong
-#endif
-
-/* Maximum value for memLevel in deflateInit2 */
-#ifndef MAX_MEM_LEVEL
-#  ifdef MAXSEG_64K
-#    define MAX_MEM_LEVEL 8
-#  else
-#    define MAX_MEM_LEVEL 9
-#  endif
-#endif
-
-/* Maximum value for windowBits in deflateInit2 and inflateInit2.
- * WARNING: reducing MAX_WBITS makes minigzip unable to extract .gz files
- * created by gzip. (Files created by minigzip can still be extracted by
- * gzip.)
- */
-#ifndef MAX_WBITS
-#  define MAX_WBITS   15 /* 32K LZ77 window */
-#endif
-
-/* The memory requirements for deflate are (in bytes):
-            (1 << (windowBits+2)) +  (1 << (memLevel+9))
- that is: 128K for windowBits=15  +  128K for memLevel = 8  (default values)
- plus a few kilobytes for small objects. For example, if you want to reduce
- the default memory requirements from 256K to 128K, compile with
-     make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
- Of course this will generally degrade compression (there's no free lunch).
-
-   The memory requirements for inflate are (in bytes) 1 << windowBits
- that is, 32K for windowBits=15 (default value) plus about 7 kilobytes
- for small objects.
-*/
-
-                        /* Type declarations */
-
-#ifndef OF /* function prototypes */
-#  ifdef STDC
-#    define OF(args)  args
-#  else
-#    define OF(args)  ()
-#  endif
-#endif
-
-#ifndef Z_ARG /* function prototypes for stdarg */
-#  if defined(STDC) || defined(Z_HAVE_STDARG_H)
-#    define Z_ARG(args)  args
-#  else
-#    define Z_ARG(args)  ()
-#  endif
-#endif
-
-/* The following definitions for FAR are needed only for MSDOS mixed
- * model programming (small or medium model with some far allocations).
- * This was tested only with MSC; for other MSDOS compilers you may have
- * to define NO_MEMCPY in zutil.h.  If you don't need the mixed model,
- * just define FAR to be empty.
- */
-#ifdef SYS16BIT
-#  if defined(M_I86SM) || defined(M_I86MM)
-     /* MSC small or medium model */
-#    define SMALL_MEDIUM
-#    ifdef _MSC_VER
-#      define FAR _far
-#    else
-#      define FAR far
-#    endif
-#  endif
-#  if (defined(__SMALL__) || defined(__MEDIUM__))
-     /* Turbo C small or medium model */
-#    define SMALL_MEDIUM
-#    ifdef __BORLANDC__
-#      define FAR _far
-#    else
-#      define FAR far
-#    endif
-#  endif
-#endif
-
-#if defined(WINDOWS) || defined(WIN32)
-   /* If building or using zlib as a DLL, define ZLIB_DLL.
-    * This is not mandatory, but it offers a little performance increase.
-    */
-#  ifdef ZLIB_DLL
-#    if defined(WIN32) && (!defined(__BORLANDC__) || (__BORLANDC__ >= 0x500))
-#      ifdef ZLIB_INTERNAL
-#        define ZEXTERN extern __declspec(dllexport)
-#      else
-#        define ZEXTERN extern __declspec(dllimport)
-#      endif
-#    endif
-#  endif  /* ZLIB_DLL */
-   /* If building or using zlib with the WINAPI/WINAPIV calling convention,
-    * define ZLIB_WINAPI.
-    * Caution: the standard ZLIB1.DLL is NOT compiled using ZLIB_WINAPI.
-    */
-#  ifdef ZLIB_WINAPI
-#    ifdef FAR
-#      undef FAR
-#    endif
-#    include <windows.h>
-     /* No need for _export, use ZLIB.DEF instead. */
-     /* For complete Windows compatibility, use WINAPI, not __stdcall. */
-#    define ZEXPORT WINAPI
-#    ifdef WIN32
-#      define ZEXPORTVA WINAPIV
-#    else
-#      define ZEXPORTVA FAR CDECL
-#    endif
-#  endif
-#endif
-
-#if defined (__BEOS__)
-#  ifdef ZLIB_DLL
-#    ifdef ZLIB_INTERNAL
-#      define ZEXPORT   __declspec(dllexport)
-#      define ZEXPORTVA __declspec(dllexport)
-#    else
-#      define ZEXPORT   __declspec(dllimport)
-#      define ZEXPORTVA __declspec(dllimport)
-#    endif
-#  endif
-#endif
-
-#ifndef ZEXTERN
-#  define ZEXTERN extern
-#endif
-#ifndef ZEXPORT
-#  define ZEXPORT
-#endif
-#ifndef ZEXPORTVA
-#  define ZEXPORTVA
-#endif
-
-#ifndef FAR
-#  define FAR
-#endif
-
-#if !defined(__MACTYPES__)
-typedef unsigned char  Byte;  /* 8 bits */
-#endif
-typedef unsigned int   uInt;  /* 16 bits or more */
-typedef unsigned long  uLong; /* 32 bits or more */
-
-#ifdef SMALL_MEDIUM
-   /* Borland C/C++ and some old MSC versions ignore FAR inside typedef */
-#  define Bytef Byte FAR
-#else
-   typedef Byte  FAR Bytef;
-#endif
-typedef char  FAR charf;
-typedef int   FAR intf;
-typedef uInt  FAR uIntf;
-typedef uLong FAR uLongf;
-
-#ifdef STDC
-   typedef void const *voidpc;
-   typedef void FAR   *voidpf;
-   typedef void       *voidp;
-#else
-   typedef Byte const *voidpc;
-   typedef Byte FAR   *voidpf;
-   typedef Byte       *voidp;
-#endif
-
-#if !defined(Z_U4) && !defined(Z_SOLO) && defined(STDC)
-#  include <limits.h>
-#  if (UINT_MAX == 0xffffffffUL)
-#    define Z_U4 unsigned
-#  elif (ULONG_MAX == 0xffffffffUL)
-#    define Z_U4 unsigned long
-#  elif (USHRT_MAX == 0xffffffffUL)
-#    define Z_U4 unsigned short
-#  endif
-#endif
-
-#ifdef Z_U4
-   typedef Z_U4 z_crc_t;
-#else
-   typedef unsigned long z_crc_t;
-#endif
-
-#ifdef HAVE_UNISTD_H    /* may be set to #if 1 by ./configure */
-#  define Z_HAVE_UNISTD_H
-#endif
-
-#ifdef HAVE_STDARG_H    /* may be set to #if 1 by ./configure */
-#  define Z_HAVE_STDARG_H
-#endif
-
-#ifdef STDC
-#  ifndef Z_SOLO
-#    include <sys/types.h>      /* for off_t */
-#  endif
-#endif
-
-#if defined(STDC) || defined(Z_HAVE_STDARG_H)
-#  ifndef Z_SOLO
-#    include <stdarg.h>         /* for va_list */
-#  endif
-#endif
-
-#ifdef _WIN32
-#  ifndef Z_SOLO
-#    include <stddef.h>         /* for wchar_t */
-#  endif
-#endif
-
-/* a little trick to accommodate both "#define _LARGEFILE64_SOURCE" and
- * "#define _LARGEFILE64_SOURCE 1" as requesting 64-bit operations, (even
- * though the former does not conform to the LFS document), but considering
- * both "#undef _LARGEFILE64_SOURCE" and "#define _LARGEFILE64_SOURCE 0" as
- * equivalently requesting no 64-bit operations
- */
-#if defined(_LARGEFILE64_SOURCE) && -_LARGEFILE64_SOURCE - -1 == 1
-#  undef _LARGEFILE64_SOURCE
-#endif
-
-#if defined(__WATCOMC__) && !defined(Z_HAVE_UNISTD_H)
-#  define Z_HAVE_UNISTD_H
-#endif
-#ifndef Z_SOLO
-#  if defined(Z_HAVE_UNISTD_H) || defined(_LARGEFILE64_SOURCE)
-#    include <unistd.h>         /* for SEEK_*, off_t, and _LFS64_LARGEFILE */
-#    ifdef VMS
-#      include <unixio.h>       /* for off_t */
-#    endif
-#    ifndef z_off_t
-#      define z_off_t off_t
-#    endif
-#  endif
-#endif
-
-#if defined(_LFS64_LARGEFILE) && _LFS64_LARGEFILE-0
-#  define Z_LFS64
-#endif
-
-#if defined(_LARGEFILE64_SOURCE) && defined(Z_LFS64)
-#  define Z_LARGE64
-#endif
-
-#if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS-0 == 64 && defined(Z_LFS64)
-#  define Z_WANT64
-#endif
-
-#if !defined(SEEK_SET) && !defined(Z_SOLO)
-#  define SEEK_SET        0       /* Seek from beginning of file.  */
-#  define SEEK_CUR        1       /* Seek from current position.  */
-#  define SEEK_END        2       /* Set file pointer to EOF plus "offset" */
-#endif
-
-#ifndef z_off_t
-#  define z_off_t long
-#endif
-
-#if !defined(_WIN32) && defined(Z_LARGE64)
-#  define z_off64_t off64_t
-#else
-#  if defined(_WIN32) && !defined(__GNUC__) && !defined(Z_SOLO)
-#    define z_off64_t __int64
-#  else
-#    define z_off64_t z_off_t
-#  endif
-#endif
-
-/* MVS linker does not support external names larger than 8 bytes */
-#if defined(__MVS__)
-  #pragma map(deflateInit_,"DEIN")
-  #pragma map(deflateInit2_,"DEIN2")
-  #pragma map(deflateEnd,"DEEND")
-  #pragma map(deflateBound,"DEBND")
-  #pragma map(inflateInit_,"ININ")
-  #pragma map(inflateInit2_,"ININ2")
-  #pragma map(inflateEnd,"INEND")
-  #pragma map(inflateSync,"INSY")
-  #pragma map(inflateSetDictionary,"INSEDI")
-  #pragma map(compressBound,"CMBND")
-  #pragma map(inflate_table,"INTABL")
-  #pragma map(inflate_fast,"INFA")
-  #pragma map(inflate_copyright,"INCOPY")
-#endif
-
-#endif /* ZCONF_H */
diff --git a/src/png/zlib/zconf.h.included b/src/png/zlib/zconf.h.included
deleted file mode 100644
index 5e1d68a00..000000000
--- a/src/png/zlib/zconf.h.included
+++ /dev/null
@@ -1,534 +0,0 @@
-/* zconf.h -- configuration of the zlib compression library
- * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* @(#) $Id$ */
-
-#ifndef ZCONF_H
-#define ZCONF_H
-
-/*
- * If you *really* need a unique prefix for all types and library functions,
- * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it.
- * Even better than compiling with -DZ_PREFIX would be to use configure to set
- * this permanently in zconf.h using "./configure --zprefix".
- */
-#ifdef Z_PREFIX     /* may be set to #if 1 by ./configure */
-#  define Z_PREFIX_SET
-
-/* all linked symbols and init macros */
-#  define _dist_code            z__dist_code
-#  define _length_code          z__length_code
-#  define _tr_align             z__tr_align
-#  define _tr_flush_bits        z__tr_flush_bits
-#  define _tr_flush_block       z__tr_flush_block
-#  define _tr_init              z__tr_init
-#  define _tr_stored_block      z__tr_stored_block
-#  define _tr_tally             z__tr_tally
-#  define adler32               z_adler32
-#  define adler32_combine       z_adler32_combine
-#  define adler32_combine64     z_adler32_combine64
-#  define adler32_z             z_adler32_z
-#  ifndef Z_SOLO
-#    define compress              z_compress
-#    define compress2             z_compress2
-#    define compressBound         z_compressBound
-#  endif
-#  define crc32                 z_crc32
-#  define crc32_combine         z_crc32_combine
-#  define crc32_combine64       z_crc32_combine64
-#  define crc32_z               z_crc32_z
-#  define deflate               z_deflate
-#  define deflateBound          z_deflateBound
-#  define deflateCopy           z_deflateCopy
-#  define deflateEnd            z_deflateEnd
-#  define deflateGetDictionary  z_deflateGetDictionary
-#  define deflateInit           z_deflateInit
-#  define deflateInit2          z_deflateInit2
-#  define deflateInit2_         z_deflateInit2_
-#  define deflateInit_          z_deflateInit_
-#  define deflateParams         z_deflateParams
-#  define deflatePending        z_deflatePending
-#  define deflatePrime          z_deflatePrime
-#  define deflateReset          z_deflateReset
-#  define deflateResetKeep      z_deflateResetKeep
-#  define deflateSetDictionary  z_deflateSetDictionary
-#  define deflateSetHeader      z_deflateSetHeader
-#  define deflateTune           z_deflateTune
-#  define deflate_copyright     z_deflate_copyright
-#  define get_crc_table         z_get_crc_table
-#  ifndef Z_SOLO
-#    define gz_error              z_gz_error
-#    define gz_intmax             z_gz_intmax
-#    define gz_strwinerror        z_gz_strwinerror
-#    define gzbuffer              z_gzbuffer
-#    define gzclearerr            z_gzclearerr
-#    define gzclose               z_gzclose
-#    define gzclose_r             z_gzclose_r
-#    define gzclose_w             z_gzclose_w
-#    define gzdirect              z_gzdirect
-#    define gzdopen               z_gzdopen
-#    define gzeof                 z_gzeof
-#    define gzerror               z_gzerror
-#    define gzflush               z_gzflush
-#    define gzfread               z_gzfread
-#    define gzfwrite              z_gzfwrite
-#    define gzgetc                z_gzgetc
-#    define gzgetc_               z_gzgetc_
-#    define gzgets                z_gzgets
-#    define gzoffset              z_gzoffset
-#    define gzoffset64            z_gzoffset64
-#    define gzopen                z_gzopen
-#    define gzopen64              z_gzopen64
-#    ifdef _WIN32
-#      define gzopen_w              z_gzopen_w
-#    endif
-#    define gzprintf              z_gzprintf
-#    define gzputc                z_gzputc
-#    define gzputs                z_gzputs
-#    define gzread                z_gzread
-#    define gzrewind              z_gzrewind
-#    define gzseek                z_gzseek
-#    define gzseek64              z_gzseek64
-#    define gzsetparams           z_gzsetparams
-#    define gztell                z_gztell
-#    define gztell64              z_gztell64
-#    define gzungetc              z_gzungetc
-#    define gzvprintf             z_gzvprintf
-#    define gzwrite               z_gzwrite
-#  endif
-#  define inflate               z_inflate
-#  define inflateBack           z_inflateBack
-#  define inflateBackEnd        z_inflateBackEnd
-#  define inflateBackInit       z_inflateBackInit
-#  define inflateBackInit_      z_inflateBackInit_
-#  define inflateCodesUsed      z_inflateCodesUsed
-#  define inflateCopy           z_inflateCopy
-#  define inflateEnd            z_inflateEnd
-#  define inflateGetDictionary  z_inflateGetDictionary
-#  define inflateGetHeader      z_inflateGetHeader
-#  define inflateInit           z_inflateInit
-#  define inflateInit2          z_inflateInit2
-#  define inflateInit2_         z_inflateInit2_
-#  define inflateInit_          z_inflateInit_
-#  define inflateMark           z_inflateMark
-#  define inflatePrime          z_inflatePrime
-#  define inflateReset          z_inflateReset
-#  define inflateReset2         z_inflateReset2
-#  define inflateResetKeep      z_inflateResetKeep
-#  define inflateSetDictionary  z_inflateSetDictionary
-#  define inflateSync           z_inflateSync
-#  define inflateSyncPoint      z_inflateSyncPoint
-#  define inflateUndermine      z_inflateUndermine
-#  define inflateValidate       z_inflateValidate
-#  define inflate_copyright     z_inflate_copyright
-#  define inflate_fast          z_inflate_fast
-#  define inflate_table         z_inflate_table
-#  ifndef Z_SOLO
-#    define uncompress            z_uncompress
-#    define uncompress2           z_uncompress2
-#  endif
-#  define zError                z_zError
-#  ifndef Z_SOLO
-#    define zcalloc               z_zcalloc
-#    define zcfree                z_zcfree
-#  endif
-#  define zlibCompileFlags      z_zlibCompileFlags
-#  define zlibVersion           z_zlibVersion
-
-/* all zlib typedefs in zlib.h and zconf.h */
-#  define Byte                  z_Byte
-#  define Bytef                 z_Bytef
-#  define alloc_func            z_alloc_func
-#  define charf                 z_charf
-#  define free_func             z_free_func
-#  ifndef Z_SOLO
-#    define gzFile                z_gzFile
-#  endif
-#  define gz_header             z_gz_header
-#  define gz_headerp            z_gz_headerp
-#  define in_func               z_in_func
-#  define intf                  z_intf
-#  define out_func              z_out_func
-#  define uInt                  z_uInt
-#  define uIntf                 z_uIntf
-#  define uLong                 z_uLong
-#  define uLongf                z_uLongf
-#  define voidp                 z_voidp
-#  define voidpc                z_voidpc
-#  define voidpf                z_voidpf
-
-/* all zlib structs in zlib.h and zconf.h */
-#  define gz_header_s           z_gz_header_s
-#  define internal_state        z_internal_state
-
-#endif
-
-#if defined(__MSDOS__) && !defined(MSDOS)
-#  define MSDOS
-#endif
-#if (defined(OS_2) || defined(__OS2__)) && !defined(OS2)
-#  define OS2
-#endif
-#if defined(_WINDOWS) && !defined(WINDOWS)
-#  define WINDOWS
-#endif
-#if defined(_WIN32) || defined(_WIN32_WCE) || defined(__WIN32__)
-#  ifndef WIN32
-#    define WIN32
-#  endif
-#endif
-#if (defined(MSDOS) || defined(OS2) || defined(WINDOWS)) && !defined(WIN32)
-#  if !defined(__GNUC__) && !defined(__FLAT__) && !defined(__386__)
-#    ifndef SYS16BIT
-#      define SYS16BIT
-#    endif
-#  endif
-#endif
-
-/*
- * Compile with -DMAXSEG_64K if the alloc function cannot allocate more
- * than 64k bytes at a time (needed on systems with 16-bit int).
- */
-#ifdef SYS16BIT
-#  define MAXSEG_64K
-#endif
-#ifdef MSDOS
-#  define UNALIGNED_OK
-#endif
-
-#ifdef __STDC_VERSION__
-#  ifndef STDC
-#    define STDC
-#  endif
-#  if __STDC_VERSION__ >= 199901L
-#    ifndef STDC99
-#      define STDC99
-#    endif
-#  endif
-#endif
-#if !defined(STDC) && (defined(__STDC__) || defined(__cplusplus))
-#  define STDC
-#endif
-#if !defined(STDC) && (defined(__GNUC__) || defined(__BORLANDC__))
-#  define STDC
-#endif
-#if !defined(STDC) && (defined(MSDOS) || defined(WINDOWS) || defined(WIN32))
-#  define STDC
-#endif
-#if !defined(STDC) && (defined(OS2) || defined(__HOS_AIX__))
-#  define STDC
-#endif
-
-#if defined(__OS400__) && !defined(STDC)    /* iSeries (formerly AS/400). */
-#  define STDC
-#endif
-
-#ifndef STDC
-#  ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */
-#    define const       /* note: need a more gentle solution here */
-#  endif
-#endif
-
-#if defined(ZLIB_CONST) && !defined(z_const)
-#  define z_const const
-#else
-#  define z_const
-#endif
-
-#ifdef Z_SOLO
-   typedef unsigned long z_size_t;
-#else
-#  define z_longlong long long
-#  if defined(NO_SIZE_T)
-     typedef unsigned NO_SIZE_T z_size_t;
-#  elif defined(STDC)
-#    include <stddef.h>
-     typedef size_t z_size_t;
-#  else
-     typedef unsigned long z_size_t;
-#  endif
-#  undef z_longlong
-#endif
-
-/* Maximum value for memLevel in deflateInit2 */
-#ifndef MAX_MEM_LEVEL
-#  ifdef MAXSEG_64K
-#    define MAX_MEM_LEVEL 8
-#  else
-#    define MAX_MEM_LEVEL 9
-#  endif
-#endif
-
-/* Maximum value for windowBits in deflateInit2 and inflateInit2.
- * WARNING: reducing MAX_WBITS makes minigzip unable to extract .gz files
- * created by gzip. (Files created by minigzip can still be extracted by
- * gzip.)
- */
-#ifndef MAX_WBITS
-#  define MAX_WBITS   15 /* 32K LZ77 window */
-#endif
-
-/* The memory requirements for deflate are (in bytes):
-            (1 << (windowBits+2)) +  (1 << (memLevel+9))
- that is: 128K for windowBits=15  +  128K for memLevel = 8  (default values)
- plus a few kilobytes for small objects. For example, if you want to reduce
- the default memory requirements from 256K to 128K, compile with
-     make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
- Of course this will generally degrade compression (there's no free lunch).
-
-   The memory requirements for inflate are (in bytes) 1 << windowBits
- that is, 32K for windowBits=15 (default value) plus about 7 kilobytes
- for small objects.
-*/
-
-                        /* Type declarations */
-
-#ifndef OF /* function prototypes */
-#  ifdef STDC
-#    define OF(args)  args
-#  else
-#    define OF(args)  ()
-#  endif
-#endif
-
-#ifndef Z_ARG /* function prototypes for stdarg */
-#  if defined(STDC) || defined(Z_HAVE_STDARG_H)
-#    define Z_ARG(args)  args
-#  else
-#    define Z_ARG(args)  ()
-#  endif
-#endif
-
-/* The following definitions for FAR are needed only for MSDOS mixed
- * model programming (small or medium model with some far allocations).
- * This was tested only with MSC; for other MSDOS compilers you may have
- * to define NO_MEMCPY in zutil.h.  If you don't need the mixed model,
- * just define FAR to be empty.
- */
-#ifdef SYS16BIT
-#  if defined(M_I86SM) || defined(M_I86MM)
-     /* MSC small or medium model */
-#    define SMALL_MEDIUM
-#    ifdef _MSC_VER
-#      define FAR _far
-#    else
-#      define FAR far
-#    endif
-#  endif
-#  if (defined(__SMALL__) || defined(__MEDIUM__))
-     /* Turbo C small or medium model */
-#    define SMALL_MEDIUM
-#    ifdef __BORLANDC__
-#      define FAR _far
-#    else
-#      define FAR far
-#    endif
-#  endif
-#endif
-
-#if defined(WINDOWS) || defined(WIN32)
-   /* If building or using zlib as a DLL, define ZLIB_DLL.
-    * This is not mandatory, but it offers a little performance increase.
-    */
-#  ifdef ZLIB_DLL
-#    if defined(WIN32) && (!defined(__BORLANDC__) || (__BORLANDC__ >= 0x500))
-#      ifdef ZLIB_INTERNAL
-#        define ZEXTERN extern __declspec(dllexport)
-#      else
-#        define ZEXTERN extern __declspec(dllimport)
-#      endif
-#    endif
-#  endif  /* ZLIB_DLL */
-   /* If building or using zlib with the WINAPI/WINAPIV calling convention,
-    * define ZLIB_WINAPI.
-    * Caution: the standard ZLIB1.DLL is NOT compiled using ZLIB_WINAPI.
-    */
-#  ifdef ZLIB_WINAPI
-#    ifdef FAR
-#      undef FAR
-#    endif
-#    include <windows.h>
-     /* No need for _export, use ZLIB.DEF instead. */
-     /* For complete Windows compatibility, use WINAPI, not __stdcall. */
-#    define ZEXPORT WINAPI
-#    ifdef WIN32
-#      define ZEXPORTVA WINAPIV
-#    else
-#      define ZEXPORTVA FAR CDECL
-#    endif
-#  endif
-#endif
-
-#if defined (__BEOS__)
-#  ifdef ZLIB_DLL
-#    ifdef ZLIB_INTERNAL
-#      define ZEXPORT   __declspec(dllexport)
-#      define ZEXPORTVA __declspec(dllexport)
-#    else
-#      define ZEXPORT   __declspec(dllimport)
-#      define ZEXPORTVA __declspec(dllimport)
-#    endif
-#  endif
-#endif
-
-#ifndef ZEXTERN
-#  define ZEXTERN extern
-#endif
-#ifndef ZEXPORT
-#  define ZEXPORT
-#endif
-#ifndef ZEXPORTVA
-#  define ZEXPORTVA
-#endif
-
-#ifndef FAR
-#  define FAR
-#endif
-
-#if !defined(__MACTYPES__)
-typedef unsigned char  Byte;  /* 8 bits */
-#endif
-typedef unsigned int   uInt;  /* 16 bits or more */
-typedef unsigned long  uLong; /* 32 bits or more */
-
-#ifdef SMALL_MEDIUM
-   /* Borland C/C++ and some old MSC versions ignore FAR inside typedef */
-#  define Bytef Byte FAR
-#else
-   typedef Byte  FAR Bytef;
-#endif
-typedef char  FAR charf;
-typedef int   FAR intf;
-typedef uInt  FAR uIntf;
-typedef uLong FAR uLongf;
-
-#ifdef STDC
-   typedef void const *voidpc;
-   typedef void FAR   *voidpf;
-   typedef void       *voidp;
-#else
-   typedef Byte const *voidpc;
-   typedef Byte FAR   *voidpf;
-   typedef Byte       *voidp;
-#endif
-
-#if !defined(Z_U4) && !defined(Z_SOLO) && defined(STDC)
-#  include <limits.h>
-#  if (UINT_MAX == 0xffffffffUL)
-#    define Z_U4 unsigned
-#  elif (ULONG_MAX == 0xffffffffUL)
-#    define Z_U4 unsigned long
-#  elif (USHRT_MAX == 0xffffffffUL)
-#    define Z_U4 unsigned short
-#  endif
-#endif
-
-#ifdef Z_U4
-   typedef Z_U4 z_crc_t;
-#else
-   typedef unsigned long z_crc_t;
-#endif
-
-#ifdef HAVE_UNISTD_H    /* may be set to #if 1 by ./configure */
-#  define Z_HAVE_UNISTD_H
-#endif
-
-#ifdef HAVE_STDARG_H    /* may be set to #if 1 by ./configure */
-#  define Z_HAVE_STDARG_H
-#endif
-
-#ifdef STDC
-#  ifndef Z_SOLO
-#    include <sys/types.h>      /* for off_t */
-#  endif
-#endif
-
-#if defined(STDC) || defined(Z_HAVE_STDARG_H)
-#  ifndef Z_SOLO
-#    include <stdarg.h>         /* for va_list */
-#  endif
-#endif
-
-#ifdef _WIN32
-#  ifndef Z_SOLO
-#    include <stddef.h>         /* for wchar_t */
-#  endif
-#endif
-
-/* a little trick to accommodate both "#define _LARGEFILE64_SOURCE" and
- * "#define _LARGEFILE64_SOURCE 1" as requesting 64-bit operations, (even
- * though the former does not conform to the LFS document), but considering
- * both "#undef _LARGEFILE64_SOURCE" and "#define _LARGEFILE64_SOURCE 0" as
- * equivalently requesting no 64-bit operations
- */
-#if defined(_LARGEFILE64_SOURCE) && -_LARGEFILE64_SOURCE - -1 == 1
-#  undef _LARGEFILE64_SOURCE
-#endif
-
-#if defined(__WATCOMC__) && !defined(Z_HAVE_UNISTD_H)
-#  define Z_HAVE_UNISTD_H
-#endif
-#ifndef Z_SOLO
-#  if defined(Z_HAVE_UNISTD_H) || defined(_LARGEFILE64_SOURCE)
-#    include <unistd.h>         /* for SEEK_*, off_t, and _LFS64_LARGEFILE */
-#    ifdef VMS
-#      include <unixio.h>       /* for off_t */
-#    endif
-#    ifndef z_off_t
-#      define z_off_t off_t
-#    endif
-#  endif
-#endif
-
-#if defined(_LFS64_LARGEFILE) && _LFS64_LARGEFILE-0
-#  define Z_LFS64
-#endif
-
-#if defined(_LARGEFILE64_SOURCE) && defined(Z_LFS64)
-#  define Z_LARGE64
-#endif
-
-#if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS-0 == 64 && defined(Z_LFS64)
-#  define Z_WANT64
-#endif
-
-#if !defined(SEEK_SET) && !defined(Z_SOLO)
-#  define SEEK_SET        0       /* Seek from beginning of file.  */
-#  define SEEK_CUR        1       /* Seek from current position.  */
-#  define SEEK_END        2       /* Set file pointer to EOF plus "offset" */
-#endif
-
-#ifndef z_off_t
-#  define z_off_t long
-#endif
-
-#if !defined(_WIN32) && defined(Z_LARGE64)
-#  define z_off64_t off64_t
-#else
-#  if defined(_WIN32) && !defined(__GNUC__) && !defined(Z_SOLO)
-#    define z_off64_t __int64
-#  else
-#    define z_off64_t z_off_t
-#  endif
-#endif
-
-/* MVS linker does not support external names larger than 8 bytes */
-#if defined(__MVS__)
-  #pragma map(deflateInit_,"DEIN")
-  #pragma map(deflateInit2_,"DEIN2")
-  #pragma map(deflateEnd,"DEEND")
-  #pragma map(deflateBound,"DEBND")
-  #pragma map(inflateInit_,"ININ")
-  #pragma map(inflateInit2_,"ININ2")
-  #pragma map(inflateEnd,"INEND")
-  #pragma map(inflateSync,"INSY")
-  #pragma map(inflateSetDictionary,"INSEDI")
-  #pragma map(compressBound,"CMBND")
-  #pragma map(inflate_table,"INTABL")
-  #pragma map(inflate_fast,"INFA")
-  #pragma map(inflate_copyright,"INCOPY")
-#endif
-
-#endif /* ZCONF_H */
diff --git a/src/png/zlib/zlib.3 b/src/png/zlib/zlib.3
deleted file mode 100644
index bda4eb073..000000000
--- a/src/png/zlib/zlib.3
+++ /dev/null
@@ -1,149 +0,0 @@
-.TH ZLIB 3 "15 Jan 2017"
-.SH NAME
-zlib \- compression/decompression library
-.SH SYNOPSIS
-[see
-.I zlib.h
-for full description]
-.SH DESCRIPTION
-The
-.I zlib
-library is a general purpose data compression library.
-The code is thread safe, assuming that the standard library functions
-used are thread safe, such as memory allocation routines.
-It provides in-memory compression and decompression functions,
-including integrity checks of the uncompressed data.
-This version of the library supports only one compression method (deflation)
-but other algorithms may be added later
-with the same stream interface.
-.LP
-Compression can be done in a single step if the buffers are large enough
-or can be done by repeated calls of the compression function.
-In the latter case,
-the application must provide more input and/or consume the output
-(providing more output space) before each call.
-.LP
-The library also supports reading and writing files in
-.IR gzip (1)
-(.gz) format
-with an interface similar to that of stdio.
-.LP
-The library does not install any signal handler.
-The decoder checks the consistency of the compressed data,
-so the library should never crash even in the case of corrupted input.
-.LP
-All functions of the compression library are documented in the file
-.IR zlib.h .
-The distribution source includes examples of use of the library
-in the files
-.I test/example.c
-and
-.IR test/minigzip.c,
-as well as other examples in the
-.IR examples/
-directory.
-.LP
-Changes to this version are documented in the file
-.I ChangeLog
-that accompanies the source.
-.LP
-.I zlib
-is built in to many languages and operating systems, including but not limited to
-Java, Python, .NET, PHP, Perl, Ruby, Swift, and Go.
-.LP
-An experimental package to read and write files in the .zip format,
-written on top of
-.I zlib
-by Gilles Vollant (info@winimage.com),
-is available at:
-.IP
-http://www.winimage.com/zLibDll/minizip.html
-and also in the
-.I contrib/minizip
-directory of the main
-.I zlib
-source distribution.
-.SH "SEE ALSO"
-The
-.I zlib
-web site can be found at:
-.IP
-http://zlib.net/
-.LP
-The data format used by the
-.I zlib
-library is described by RFC
-(Request for Comments) 1950 to 1952 in the files:
-.IP
-http://tools.ietf.org/html/rfc1950 (for the zlib header and trailer format)
-.br
-http://tools.ietf.org/html/rfc1951 (for the deflate compressed data format)
-.br
-http://tools.ietf.org/html/rfc1952 (for the gzip header and trailer format)
-.LP
-Mark Nelson wrote an article about
-.I zlib
-for the Jan. 1997 issue of  Dr. Dobb's Journal;
-a copy of the article is available at:
-.IP
-http://marknelson.us/1997/01/01/zlib-engine/
-.SH "REPORTING PROBLEMS"
-Before reporting a problem,
-please check the
-.I zlib
-web site to verify that you have the latest version of
-.IR zlib ;
-otherwise,
-obtain the latest version and see if the problem still exists.
-Please read the
-.I zlib
-FAQ at:
-.IP
-http://zlib.net/zlib_faq.html
-.LP
-before asking for help.
-Send questions and/or comments to zlib@gzip.org,
-or (for the Windows DLL version) to Gilles Vollant (info@winimage.com).
-.SH AUTHORS AND LICENSE
-Version 1.2.11
-.LP
-Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
-.LP
-This software is provided 'as-is', without any express or implied
-warranty.  In no event will the authors be held liable for any damages
-arising from the use of this software.
-.LP
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-.LP
-.nr step 1 1
-.IP \n[step]. 3
-The origin of this software must not be misrepresented; you must not
-claim that you wrote the original software. If you use this software
-in a product, an acknowledgment in the product documentation would be
-appreciated but is not required.
-.IP \n+[step].
-Altered source versions must be plainly marked as such, and must not be
-misrepresented as being the original software.
-.IP \n+[step].
-This notice may not be removed or altered from any source distribution.
-.LP
-Jean-loup Gailly        Mark Adler
-.br
-jloup@gzip.org          madler@alumni.caltech.edu
-.LP
-The deflate format used by
-.I zlib
-was defined by Phil Katz.
-The deflate and
-.I zlib
-specifications were written by L. Peter Deutsch.
-Thanks to all the people who reported problems and suggested various
-improvements in
-.IR zlib ;
-who are too numerous to cite here.
-.LP
-UNIX manual page by R. P. C. Rodgers,
-U.S. National Library of Medicine (rodgers@nlm.nih.gov).
-.\" end of man page
diff --git a/src/png/zlib/zlib.3.pdf b/src/png/zlib/zlib.3.pdf
deleted file mode 100644
index 6fa519c5b..000000000
--- a/src/png/zlib/zlib.3.pdf
+++ /dev/null
diff --git a/src/png/zlib/zlib.h b/src/png/zlib/zlib.h
deleted file mode 100644
index f09cdaf1e..000000000
--- a/src/png/zlib/zlib.h
+++ /dev/null
@@ -1,1912 +0,0 @@
-/* zlib.h -- interface of the 'zlib' general purpose compression library
-  version 1.2.11, January 15th, 2017
-
-  Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the authors be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-
-  Jean-loup Gailly        Mark Adler
-  jloup@gzip.org          madler@alumni.caltech.edu
-
-
-  The data format used by the zlib library is described by RFCs (Request for
-  Comments) 1950 to 1952 in the files http://tools.ietf.org/html/rfc1950
-  (zlib format), rfc1951 (deflate format) and rfc1952 (gzip format).
-*/
-
-#ifndef ZLIB_H
-#define ZLIB_H
-
-#include "zconf.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#define ZLIB_VERSION "1.2.11"
-#define ZLIB_VERNUM 0x12b0
-#define ZLIB_VER_MAJOR 1
-#define ZLIB_VER_MINOR 2
-#define ZLIB_VER_REVISION 11
-#define ZLIB_VER_SUBREVISION 0
-
-/*
-    The 'zlib' compression library provides in-memory compression and
-  decompression functions, including integrity checks of the uncompressed data.
-  This version of the library supports only one compression method (deflation)
-  but other algorithms will be added later and will have the same stream
-  interface.
-
-    Compression can be done in a single step if the buffers are large enough,
-  or can be done by repeated calls of the compression function.  In the latter
-  case, the application must provide more input and/or consume the output
-  (providing more output space) before each call.
-
-    The compressed data format used by default by the in-memory functions is
-  the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped
-  around a deflate stream, which is itself documented in RFC 1951.
-
-    The library also supports reading and writing files in gzip (.gz) format
-  with an interface similar to that of stdio using the functions that start
-  with "gz".  The gzip format is different from the zlib format.  gzip is a
-  gzip wrapper, documented in RFC 1952, wrapped around a deflate stream.
-
-    This library can optionally read and write gzip and raw deflate streams in
-  memory as well.
-
-    The zlib format was designed to be compact and fast for use in memory
-  and on communications channels.  The gzip format was designed for single-
-  file compression on file systems, has a larger header than zlib to maintain
-  directory information, and uses a different, slower check method than zlib.
-
-    The library does not install any signal handler.  The decoder checks
-  the consistency of the compressed data, so the library should never crash
-  even in the case of corrupted input.
-*/
-
-typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
-typedef void   (*free_func)  OF((voidpf opaque, voidpf address));
-
-struct internal_state;
-
-typedef struct z_stream_s {
-    z_const Bytef *next_in;     /* next input byte */
-    uInt     avail_in;  /* number of bytes available at next_in */
-    uLong    total_in;  /* total number of input bytes read so far */
-
-    Bytef    *next_out; /* next output byte will go here */
-    uInt     avail_out; /* remaining free space at next_out */
-    uLong    total_out; /* total number of bytes output so far */
-
-    z_const char *msg;  /* last error message, NULL if no error */
-    struct internal_state FAR *state; /* not visible by applications */
-
-    alloc_func zalloc;  /* used to allocate the internal state */
-    free_func  zfree;   /* used to free the internal state */
-    voidpf     opaque;  /* private data object passed to zalloc and zfree */
-
-    int     data_type;  /* best guess about the data type: binary or text
-                           for deflate, or the decoding state for inflate */
-    uLong   adler;      /* Adler-32 or CRC-32 value of the uncompressed data */
-    uLong   reserved;   /* reserved for future use */
-} z_stream;
-
-typedef z_stream FAR *z_streamp;
-
-/*
-     gzip header information passed to and from zlib routines.  See RFC 1952
-  for more details on the meanings of these fields.
-*/
-typedef struct gz_header_s {
-    int     text;       /* true if compressed data believed to be text */
-    uLong   time;       /* modification time */
-    int     xflags;     /* extra flags (not used when writing a gzip file) */
-    int     os;         /* operating system */
-    Bytef   *extra;     /* pointer to extra field or Z_NULL if none */
-    uInt    extra_len;  /* extra field length (valid if extra != Z_NULL) */
-    uInt    extra_max;  /* space at extra (only when reading header) */
-    Bytef   *name;      /* pointer to zero-terminated file name or Z_NULL */
-    uInt    name_max;   /* space at name (only when reading header) */
-    Bytef   *comment;   /* pointer to zero-terminated comment or Z_NULL */
-    uInt    comm_max;   /* space at comment (only when reading header) */
-    int     hcrc;       /* true if there was or will be a header crc */
-    int     done;       /* true when done reading gzip header (not used
-                           when writing a gzip file) */
-} gz_header;
-
-typedef gz_header FAR *gz_headerp;
-
-/*
-     The application must update next_in and avail_in when avail_in has dropped
-   to zero.  It must update next_out and avail_out when avail_out has dropped
-   to zero.  The application must initialize zalloc, zfree and opaque before
-   calling the init function.  All other fields are set by the compression
-   library and must not be updated by the application.
-
-     The opaque value provided by the application will be passed as the first
-   parameter for calls of zalloc and zfree.  This can be useful for custom
-   memory management.  The compression library attaches no meaning to the
-   opaque value.
-
-     zalloc must return Z_NULL if there is not enough memory for the object.
-   If zlib is used in a multi-threaded application, zalloc and zfree must be
-   thread safe.  In that case, zlib is thread-safe.  When zalloc and zfree are
-   Z_NULL on entry to the initialization function, they are set to internal
-   routines that use the standard library functions malloc() and free().
-
-     On 16-bit systems, the functions zalloc and zfree must be able to allocate
-   exactly 65536 bytes, but will not be required to allocate more than this if
-   the symbol MAXSEG_64K is defined (see zconf.h).  WARNING: On MSDOS, pointers
-   returned by zalloc for objects of exactly 65536 bytes *must* have their
-   offset normalized to zero.  The default allocation function provided by this
-   library ensures this (see zutil.c).  To reduce memory requirements and avoid
-   any allocation of 64K objects, at the expense of compression ratio, compile
-   the library with -DMAX_WBITS=14 (see zconf.h).
-
-     The fields total_in and total_out can be used for statistics or progress
-   reports.  After compression, total_in holds the total size of the
-   uncompressed data and may be saved for use by the decompressor (particularly
-   if the decompressor wants to decompress everything in a single step).
-*/
-
-                        /* constants */
-
-#define Z_NO_FLUSH      0
-#define Z_PARTIAL_FLUSH 1
-#define Z_SYNC_FLUSH    2
-#define Z_FULL_FLUSH    3
-#define Z_FINISH        4
-#define Z_BLOCK         5
-#define Z_TREES         6
-/* Allowed flush values; see deflate() and inflate() below for details */
-
-#define Z_OK            0
-#define Z_STREAM_END    1
-#define Z_NEED_DICT     2
-#define Z_ERRNO        (-1)
-#define Z_STREAM_ERROR (-2)
-#define Z_DATA_ERROR   (-3)
-#define Z_MEM_ERROR    (-4)
-#define Z_BUF_ERROR    (-5)
-#define Z_VERSION_ERROR (-6)
-/* Return codes for the compression/decompression functions. Negative values
- * are errors, positive values are used for special but normal events.
- */
-
-#define Z_NO_COMPRESSION         0
-#define Z_BEST_SPEED             1
-#define Z_BEST_COMPRESSION       9
-#define Z_DEFAULT_COMPRESSION  (-1)
-/* compression levels */
-
-#define Z_FILTERED            1
-#define Z_HUFFMAN_ONLY        2
-#define Z_RLE                 3
-#define Z_FIXED               4
-#define Z_DEFAULT_STRATEGY    0
-/* compression strategy; see deflateInit2() below for details */
-
-#define Z_BINARY   0
-#define Z_TEXT     1
-#define Z_ASCII    Z_TEXT   /* for compatibility with 1.2.2 and earlier */
-#define Z_UNKNOWN  2
-/* Possible values of the data_type field for deflate() */
-
-#define Z_DEFLATED   8
-/* The deflate compression method (the only one supported in this version) */
-
-#define Z_NULL  0  /* for initializing zalloc, zfree, opaque */
-
-#define zlib_version zlibVersion()
-/* for compatibility with versions < 1.0.2 */
-
-
-                        /* basic functions */
-
-ZEXTERN const char * ZEXPORT zlibVersion OF((void));
-/* The application can compare zlibVersion and ZLIB_VERSION for consistency.
-   If the first character differs, the library code actually used is not
-   compatible with the zlib.h header file used by the application.  This check
-   is automatically made by deflateInit and inflateInit.
- */
-
-/*
-ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level));
-
-     Initializes the internal stream state for compression.  The fields
-   zalloc, zfree and opaque must be initialized before by the caller.  If
-   zalloc and zfree are set to Z_NULL, deflateInit updates them to use default
-   allocation functions.
-
-     The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9:
-   1 gives best speed, 9 gives best compression, 0 gives no compression at all
-   (the input data is simply copied a block at a time).  Z_DEFAULT_COMPRESSION
-   requests a default compromise between speed and compression (currently
-   equivalent to level 6).
-
-     deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
-   memory, Z_STREAM_ERROR if level is not a valid compression level, or
-   Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible
-   with the version assumed by the caller (ZLIB_VERSION).  msg is set to null
-   if there is no error message.  deflateInit does not perform any compression:
-   this will be done by deflate().
-*/
-
-
-ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
-/*
-    deflate compresses as much data as possible, and stops when the input
-  buffer becomes empty or the output buffer becomes full.  It may introduce
-  some output latency (reading input without producing any output) except when
-  forced to flush.
-
-    The detailed semantics are as follows.  deflate performs one or both of the
-  following actions:
-
-  - Compress more input starting at next_in and update next_in and avail_in
-    accordingly.  If not all input can be processed (because there is not
-    enough room in the output buffer), next_in and avail_in are updated and
-    processing will resume at this point for the next call of deflate().
-
-  - Generate more output starting at next_out and update next_out and avail_out
-    accordingly.  This action is forced if the parameter flush is non zero.
-    Forcing flush frequently degrades the compression ratio, so this parameter
-    should be set only when necessary.  Some output may be provided even if
-    flush is zero.
-
-    Before the call of deflate(), the application should ensure that at least
-  one of the actions is possible, by providing more input and/or consuming more
-  output, and updating avail_in or avail_out accordingly; avail_out should
-  never be zero before the call.  The application can consume the compressed
-  output when it wants, for example when the output buffer is full (avail_out
-  == 0), or after each call of deflate().  If deflate returns Z_OK and with
-  zero avail_out, it must be called again after making room in the output
-  buffer because there might be more output pending. See deflatePending(),
-  which can be used if desired to determine whether or not there is more ouput
-  in that case.
-
-    Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to
-  decide how much data to accumulate before producing output, in order to
-  maximize compression.
-
-    If the parameter flush is set to Z_SYNC_FLUSH, all pending output is
-  flushed to the output buffer and the output is aligned on a byte boundary, so
-  that the decompressor can get all input data available so far.  (In
-  particular avail_in is zero after the call if enough output space has been
-  provided before the call.) Flushing may degrade compression for some
-  compression algorithms and so it should be used only when necessary.  This
-  completes the current deflate block and follows it with an empty stored block
-  that is three bits plus filler bits to the next byte, followed by four bytes
-  (00 00 ff ff).
-
-    If flush is set to Z_PARTIAL_FLUSH, all pending output is flushed to the
-  output buffer, but the output is not aligned to a byte boundary.  All of the
-  input data so far will be available to the decompressor, as for Z_SYNC_FLUSH.
-  This completes the current deflate block and follows it with an empty fixed
-  codes block that is 10 bits long.  This assures that enough bytes are output
-  in order for the decompressor to finish the block before the empty fixed
-  codes block.
-
-    If flush is set to Z_BLOCK, a deflate block is completed and emitted, as
-  for Z_SYNC_FLUSH, but the output is not aligned on a byte boundary, and up to
-  seven bits of the current block are held to be written as the next byte after
-  the next deflate block is completed.  In this case, the decompressor may not
-  be provided enough bits at this point in order to complete decompression of
-  the data provided so far to the compressor.  It may need to wait for the next
-  block to be emitted.  This is for advanced applications that need to control
-  the emission of deflate blocks.
-
-    If flush is set to Z_FULL_FLUSH, all output is flushed as with
-  Z_SYNC_FLUSH, and the compression state is reset so that decompression can
-  restart from this point if previous compressed data has been damaged or if
-  random access is desired.  Using Z_FULL_FLUSH too often can seriously degrade
-  compression.
-
-    If deflate returns with avail_out == 0, this function must be called again
-  with the same value of the flush parameter and more output space (updated
-  avail_out), until the flush is complete (deflate returns with non-zero
-  avail_out).  In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that
-  avail_out is greater than six to avoid repeated flush markers due to
-  avail_out == 0 on return.
-
-    If the parameter flush is set to Z_FINISH, pending input is processed,
-  pending output is flushed and deflate returns with Z_STREAM_END if there was
-  enough output space.  If deflate returns with Z_OK or Z_BUF_ERROR, this
-  function must be called again with Z_FINISH and more output space (updated
-  avail_out) but no more input data, until it returns with Z_STREAM_END or an
-  error.  After deflate has returned Z_STREAM_END, the only possible operations
-  on the stream are deflateReset or deflateEnd.
-
-    Z_FINISH can be used in the first deflate call after deflateInit if all the
-  compression is to be done in a single step.  In order to complete in one
-  call, avail_out must be at least the value returned by deflateBound (see
-  below).  Then deflate is guaranteed to return Z_STREAM_END.  If not enough
-  output space is provided, deflate will not return Z_STREAM_END, and it must
-  be called again as described above.
-
-    deflate() sets strm->adler to the Adler-32 checksum of all input read
-  so far (that is, total_in bytes).  If a gzip stream is being generated, then
-  strm->adler will be the CRC-32 checksum of the input read so far.  (See
-  deflateInit2 below.)
-
-    deflate() may update strm->data_type if it can make a good guess about
-  the input data type (Z_BINARY or Z_TEXT).  If in doubt, the data is
-  considered binary.  This field is only for information purposes and does not
-  affect the compression algorithm in any manner.
-
-    deflate() returns Z_OK if some progress has been made (more input
-  processed or more output produced), Z_STREAM_END if all input has been
-  consumed and all output has been produced (only when flush is set to
-  Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
-  if next_in or next_out was Z_NULL or the state was inadvertently written over
-  by the application), or Z_BUF_ERROR if no progress is possible (for example
-  avail_in or avail_out was zero).  Note that Z_BUF_ERROR is not fatal, and
-  deflate() can be called again with more input and more output space to
-  continue compressing.
-*/
-
-
-ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm));
-/*
-     All dynamically allocated data structures for this stream are freed.
-   This function discards any unprocessed input and does not flush any pending
-   output.
-
-     deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the
-   stream state was inconsistent, Z_DATA_ERROR if the stream was freed
-   prematurely (some input or output was discarded).  In the error case, msg
-   may be set but then points to a static string (which must not be
-   deallocated).
-*/
-
-
-/*
-ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm));
-
-     Initializes the internal stream state for decompression.  The fields
-   next_in, avail_in, zalloc, zfree and opaque must be initialized before by
-   the caller.  In the current version of inflate, the provided input is not
-   read or consumed.  The allocation of a sliding window will be deferred to
-   the first call of inflate (if the decompression does not complete on the
-   first call).  If zalloc and zfree are set to Z_NULL, inflateInit updates
-   them to use default allocation functions.
-
-     inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
-   memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
-   version assumed by the caller, or Z_STREAM_ERROR if the parameters are
-   invalid, such as a null pointer to the structure.  msg is set to null if
-   there is no error message.  inflateInit does not perform any decompression.
-   Actual decompression will be done by inflate().  So next_in, and avail_in,
-   next_out, and avail_out are unused and unchanged.  The current
-   implementation of inflateInit() does not process any header information --
-   that is deferred until inflate() is called.
-*/
-
-
-ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush));
-/*
-    inflate decompresses as much data as possible, and stops when the input
-  buffer becomes empty or the output buffer becomes full.  It may introduce
-  some output latency (reading input without producing any output) except when
-  forced to flush.
-
-  The detailed semantics are as follows.  inflate performs one or both of the
-  following actions:
-
-  - Decompress more input starting at next_in and update next_in and avail_in
-    accordingly.  If not all input can be processed (because there is not
-    enough room in the output buffer), then next_in and avail_in are updated
-    accordingly, and processing will resume at this point for the next call of
-    inflate().
-
-  - Generate more output starting at next_out and update next_out and avail_out
-    accordingly.  inflate() provides as much output as possible, until there is
-    no more input data or no more space in the output buffer (see below about
-    the flush parameter).
-
-    Before the call of inflate(), the application should ensure that at least
-  one of the actions is possible, by providing more input and/or consuming more
-  output, and updating the next_* and avail_* values accordingly.  If the
-  caller of inflate() does not provide both available input and available
-  output space, it is possible that there will be no progress made.  The
-  application can consume the uncompressed output when it wants, for example
-  when the output buffer is full (avail_out == 0), or after each call of
-  inflate().  If inflate returns Z_OK and with zero avail_out, it must be
-  called again after making room in the output buffer because there might be
-  more output pending.
-
-    The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, Z_FINISH,
-  Z_BLOCK, or Z_TREES.  Z_SYNC_FLUSH requests that inflate() flush as much
-  output as possible to the output buffer.  Z_BLOCK requests that inflate()
-  stop if and when it gets to the next deflate block boundary.  When decoding
-  the zlib or gzip format, this will cause inflate() to return immediately
-  after the header and before the first block.  When doing a raw inflate,
-  inflate() will go ahead and process the first block, and will return when it
-  gets to the end of that block, or when it runs out of data.
-
-    The Z_BLOCK option assists in appending to or combining deflate streams.
-  To assist in this, on return inflate() always sets strm->data_type to the
-  number of unused bits in the last byte taken from strm->next_in, plus 64 if
-  inflate() is currently decoding the last block in the deflate stream, plus
-  128 if inflate() returned immediately after decoding an end-of-block code or
-  decoding the complete header up to just before the first byte of the deflate
-  stream.  The end-of-block will not be indicated until all of the uncompressed
-  data from that block has been written to strm->next_out.  The number of
-  unused bits may in general be greater than seven, except when bit 7 of
-  data_type is set, in which case the number of unused bits will be less than
-  eight.  data_type is set as noted here every time inflate() returns for all
-  flush options, and so can be used to determine the amount of currently
-  consumed input in bits.
-
-    The Z_TREES option behaves as Z_BLOCK does, but it also returns when the
-  end of each deflate block header is reached, before any actual data in that
-  block is decoded.  This allows the caller to determine the length of the
-  deflate block header for later use in random access within a deflate block.
-  256 is added to the value of strm->data_type when inflate() returns
-  immediately after reaching the end of the deflate block header.
-
-    inflate() should normally be called until it returns Z_STREAM_END or an
-  error.  However if all decompression is to be performed in a single step (a
-  single call of inflate), the parameter flush should be set to Z_FINISH.  In
-  this case all pending input is processed and all pending output is flushed;
-  avail_out must be large enough to hold all of the uncompressed data for the
-  operation to complete.  (The size of the uncompressed data may have been
-  saved by the compressor for this purpose.)  The use of Z_FINISH is not
-  required to perform an inflation in one step.  However it may be used to
-  inform inflate that a faster approach can be used for the single inflate()
-  call.  Z_FINISH also informs inflate to not maintain a sliding window if the
-  stream completes, which reduces inflate's memory footprint.  If the stream
-  does not complete, either because not all of the stream is provided or not
-  enough output space is provided, then a sliding window will be allocated and
-  inflate() can be called again to continue the operation as if Z_NO_FLUSH had
-  been used.
-
-     In this implementation, inflate() always flushes as much output as
-  possible to the output buffer, and always uses the faster approach on the
-  first call.  So the effects of the flush parameter in this implementation are
-  on the return value of inflate() as noted below, when inflate() returns early
-  when Z_BLOCK or Z_TREES is used, and when inflate() avoids the allocation of
-  memory for a sliding window when Z_FINISH is used.
-
-     If a preset dictionary is needed after this call (see inflateSetDictionary
-  below), inflate sets strm->adler to the Adler-32 checksum of the dictionary
-  chosen by the compressor and returns Z_NEED_DICT; otherwise it sets
-  strm->adler to the Adler-32 checksum of all output produced so far (that is,
-  total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described
-  below.  At the end of the stream, inflate() checks that its computed Adler-32
-  checksum is equal to that saved by the compressor and returns Z_STREAM_END
-  only if the checksum is correct.
-
-    inflate() can decompress and check either zlib-wrapped or gzip-wrapped
-  deflate data.  The header type is detected automatically, if requested when
-  initializing with inflateInit2().  Any information contained in the gzip
-  header is not retained unless inflateGetHeader() is used.  When processing
-  gzip-wrapped deflate data, strm->adler32 is set to the CRC-32 of the output
-  produced so far.  The CRC-32 is checked against the gzip trailer, as is the
-  uncompressed length, modulo 2^32.
-
-    inflate() returns Z_OK if some progress has been made (more input processed
-  or more output produced), Z_STREAM_END if the end of the compressed data has
-  been reached and all uncompressed output has been produced, Z_NEED_DICT if a
-  preset dictionary is needed at this point, Z_DATA_ERROR if the input data was
-  corrupted (input stream not conforming to the zlib format or incorrect check
-  value, in which case strm->msg points to a string with a more specific
-  error), Z_STREAM_ERROR if the stream structure was inconsistent (for example
-  next_in or next_out was Z_NULL, or the state was inadvertently written over
-  by the application), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR
-  if no progress was possible or if there was not enough room in the output
-  buffer when Z_FINISH is used.  Note that Z_BUF_ERROR is not fatal, and
-  inflate() can be called again with more input and more output space to
-  continue decompressing.  If Z_DATA_ERROR is returned, the application may
-  then call inflateSync() to look for a good compression block if a partial
-  recovery of the data is to be attempted.
-*/
-
-
-ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm));
-/*
-     All dynamically allocated data structures for this stream are freed.
-   This function discards any unprocessed input and does not flush any pending
-   output.
-
-     inflateEnd returns Z_OK if success, or Z_STREAM_ERROR if the stream state
-   was inconsistent.
-*/
-
-
-                        /* Advanced functions */
-
-/*
-    The following functions are needed only in some special applications.
-*/
-
-/*
-ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,
-                                     int  level,
-                                     int  method,
-                                     int  windowBits,
-                                     int  memLevel,
-                                     int  strategy));
-
-     This is another version of deflateInit with more compression options.  The
-   fields next_in, zalloc, zfree and opaque must be initialized before by the
-   caller.
-
-     The method parameter is the compression method.  It must be Z_DEFLATED in
-   this version of the library.
-
-     The windowBits parameter is the base two logarithm of the window size
-   (the size of the history buffer).  It should be in the range 8..15 for this
-   version of the library.  Larger values of this parameter result in better
-   compression at the expense of memory usage.  The default value is 15 if
-   deflateInit is used instead.
-
-     For the current implementation of deflate(), a windowBits value of 8 (a
-   window size of 256 bytes) is not supported.  As a result, a request for 8
-   will result in 9 (a 512-byte window).  In that case, providing 8 to
-   inflateInit2() will result in an error when the zlib header with 9 is
-   checked against the initialization of inflate().  The remedy is to not use 8
-   with deflateInit2() with this initialization, or at least in that case use 9
-   with inflateInit2().
-
-     windowBits can also be -8..-15 for raw deflate.  In this case, -windowBits
-   determines the window size.  deflate() will then generate raw deflate data
-   with no zlib header or trailer, and will not compute a check value.
-
-     windowBits can also be greater than 15 for optional gzip encoding.  Add
-   16 to windowBits to write a simple gzip header and trailer around the
-   compressed data instead of a zlib wrapper.  The gzip header will have no
-   file name, no extra data, no comment, no modification time (set to zero), no
-   header crc, and the operating system will be set to the appropriate value,
-   if the operating system was determined at compile time.  If a gzip stream is
-   being written, strm->adler is a CRC-32 instead of an Adler-32.
-
-     For raw deflate or gzip encoding, a request for a 256-byte window is
-   rejected as invalid, since only the zlib header provides a means of
-   transmitting the window size to the decompressor.
-
-     The memLevel parameter specifies how much memory should be allocated
-   for the internal compression state.  memLevel=1 uses minimum memory but is
-   slow and reduces compression ratio; memLevel=9 uses maximum memory for
-   optimal speed.  The default value is 8.  See zconf.h for total memory usage
-   as a function of windowBits and memLevel.
-
-     The strategy parameter is used to tune the compression algorithm.  Use the
-   value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a
-   filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no
-   string match), or Z_RLE to limit match distances to one (run-length
-   encoding).  Filtered data consists mostly of small values with a somewhat
-   random distribution.  In this case, the compression algorithm is tuned to
-   compress them better.  The effect of Z_FILTERED is to force more Huffman
-   coding and less string matching; it is somewhat intermediate between
-   Z_DEFAULT_STRATEGY and Z_HUFFMAN_ONLY.  Z_RLE is designed to be almost as
-   fast as Z_HUFFMAN_ONLY, but give better compression for PNG image data.  The
-   strategy parameter only affects the compression ratio but not the
-   correctness of the compressed output even if it is not set appropriately.
-   Z_FIXED prevents the use of dynamic Huffman codes, allowing for a simpler
-   decoder for special applications.
-
-     deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
-   memory, Z_STREAM_ERROR if any parameter is invalid (such as an invalid
-   method), or Z_VERSION_ERROR if the zlib library version (zlib_version) is
-   incompatible with the version assumed by the caller (ZLIB_VERSION).  msg is
-   set to null if there is no error message.  deflateInit2 does not perform any
-   compression: this will be done by deflate().
-*/
-
-ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm,
-                                             const Bytef *dictionary,
-                                             uInt  dictLength));
-/*
-     Initializes the compression dictionary from the given byte sequence
-   without producing any compressed output.  When using the zlib format, this
-   function must be called immediately after deflateInit, deflateInit2 or
-   deflateReset, and before any call of deflate.  When doing raw deflate, this
-   function must be called either before any call of deflate, or immediately
-   after the completion of a deflate block, i.e. after all input has been
-   consumed and all output has been delivered when using any of the flush
-   options Z_BLOCK, Z_PARTIAL_FLUSH, Z_SYNC_FLUSH, or Z_FULL_FLUSH.  The
-   compressor and decompressor must use exactly the same dictionary (see
-   inflateSetDictionary).
-
-     The dictionary should consist of strings (byte sequences) that are likely
-   to be encountered later in the data to be compressed, with the most commonly
-   used strings preferably put towards the end of the dictionary.  Using a
-   dictionary is most useful when the data to be compressed is short and can be
-   predicted with good accuracy; the data can then be compressed better than
-   with the default empty dictionary.
-
-     Depending on the size of the compression data structures selected by
-   deflateInit or deflateInit2, a part of the dictionary may in effect be
-   discarded, for example if the dictionary is larger than the window size
-   provided in deflateInit or deflateInit2.  Thus the strings most likely to be
-   useful should be put at the end of the dictionary, not at the front.  In
-   addition, the current implementation of deflate will use at most the window
-   size minus 262 bytes of the provided dictionary.
-
-     Upon return of this function, strm->adler is set to the Adler-32 value
-   of the dictionary; the decompressor may later use this value to determine
-   which dictionary has been used by the compressor.  (The Adler-32 value
-   applies to the whole dictionary even if only a subset of the dictionary is
-   actually used by the compressor.) If a raw deflate was requested, then the
-   Adler-32 value is not computed and strm->adler is not set.
-
-     deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a
-   parameter is invalid (e.g.  dictionary being Z_NULL) or the stream state is
-   inconsistent (for example if deflate has already been called for this stream
-   or if not at a block boundary for raw deflate).  deflateSetDictionary does
-   not perform any compression: this will be done by deflate().
-*/
-
-ZEXTERN int ZEXPORT deflateGetDictionary OF((z_streamp strm,
-                                             Bytef *dictionary,
-                                             uInt  *dictLength));
-/*
-     Returns the sliding dictionary being maintained by deflate.  dictLength is
-   set to the number of bytes in the dictionary, and that many bytes are copied
-   to dictionary.  dictionary must have enough space, where 32768 bytes is
-   always enough.  If deflateGetDictionary() is called with dictionary equal to
-   Z_NULL, then only the dictionary length is returned, and nothing is copied.
-   Similary, if dictLength is Z_NULL, then it is not set.
-
-     deflateGetDictionary() may return a length less than the window size, even
-   when more than the window size in input has been provided. It may return up
-   to 258 bytes less in that case, due to how zlib's implementation of deflate
-   manages the sliding window and lookahead for matches, where matches can be
-   up to 258 bytes long. If the application needs the last window-size bytes of
-   input, then that would need to be saved by the application outside of zlib.
-
-     deflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the
-   stream state is inconsistent.
-*/
-
-ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest,
-                                    z_streamp source));
-/*
-     Sets the destination stream as a complete copy of the source stream.
-
-     This function can be useful when several compression strategies will be
-   tried, for example when there are several ways of pre-processing the input
-   data with a filter.  The streams that will be discarded should then be freed
-   by calling deflateEnd.  Note that deflateCopy duplicates the internal
-   compression state which can be quite large, so this strategy is slow and can
-   consume lots of memory.
-
-     deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
-   enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
-   (such as zalloc being Z_NULL).  msg is left unchanged in both source and
-   destination.
-*/
-
-ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm));
-/*
-     This function is equivalent to deflateEnd followed by deflateInit, but
-   does not free and reallocate the internal compression state.  The stream
-   will leave the compression level and any other attributes that may have been
-   set unchanged.
-
-     deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
-   stream state was inconsistent (such as zalloc or state being Z_NULL).
-*/
-
-ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm,
-                                      int level,
-                                      int strategy));
-/*
-     Dynamically update the compression level and compression strategy.  The
-   interpretation of level and strategy is as in deflateInit2().  This can be
-   used to switch between compression and straight copy of the input data, or
-   to switch to a different kind of input data requiring a different strategy.
-   If the compression approach (which is a function of the level) or the
-   strategy is changed, and if any input has been consumed in a previous
-   deflate() call, then the input available so far is compressed with the old
-   level and strategy using deflate(strm, Z_BLOCK).  There are three approaches
-   for the compression levels 0, 1..3, and 4..9 respectively.  The new level
-   and strategy will take effect at the next call of deflate().
-
-     If a deflate(strm, Z_BLOCK) is performed by deflateParams(), and it does
-   not have enough output space to complete, then the parameter change will not
-   take effect.  In this case, deflateParams() can be called again with the
-   same parameters and more output space to try again.
-
-     In order to assure a change in the parameters on the first try, the
-   deflate stream should be flushed using deflate() with Z_BLOCK or other flush
-   request until strm.avail_out is not zero, before calling deflateParams().
-   Then no more input data should be provided before the deflateParams() call.
-   If this is done, the old level and strategy will be applied to the data
-   compressed before deflateParams(), and the new level and strategy will be
-   applied to the the data compressed after deflateParams().
-
-     deflateParams returns Z_OK on success, Z_STREAM_ERROR if the source stream
-   state was inconsistent or if a parameter was invalid, or Z_BUF_ERROR if
-   there was not enough output space to complete the compression of the
-   available input data before a change in the strategy or approach.  Note that
-   in the case of a Z_BUF_ERROR, the parameters are not changed.  A return
-   value of Z_BUF_ERROR is not fatal, in which case deflateParams() can be
-   retried with more output space.
-*/
-
-ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm,
-                                    int good_length,
-                                    int max_lazy,
-                                    int nice_length,
-                                    int max_chain));
-/*
-     Fine tune deflate's internal compression parameters.  This should only be
-   used by someone who understands the algorithm used by zlib's deflate for
-   searching for the best matching string, and even then only by the most
-   fanatic optimizer trying to squeeze out the last compressed bit for their
-   specific input data.  Read the deflate.c source code for the meaning of the
-   max_lazy, good_length, nice_length, and max_chain parameters.
-
-     deflateTune() can be called after deflateInit() or deflateInit2(), and
-   returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream.
- */
-
-ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm,
-                                       uLong sourceLen));
-/*
-     deflateBound() returns an upper bound on the compressed size after
-   deflation of sourceLen bytes.  It must be called after deflateInit() or
-   deflateInit2(), and after deflateSetHeader(), if used.  This would be used
-   to allocate an output buffer for deflation in a single pass, and so would be
-   called before deflate().  If that first deflate() call is provided the
-   sourceLen input bytes, an output buffer allocated to the size returned by
-   deflateBound(), and the flush value Z_FINISH, then deflate() is guaranteed
-   to return Z_STREAM_END.  Note that it is possible for the compressed size to
-   be larger than the value returned by deflateBound() if flush options other
-   than Z_FINISH or Z_NO_FLUSH are used.
-*/
-
-ZEXTERN int ZEXPORT deflatePending OF((z_streamp strm,
-                                       unsigned *pending,
-                                       int *bits));
-/*
-     deflatePending() returns the number of bytes and bits of output that have
-   been generated, but not yet provided in the available output.  The bytes not
-   provided would be due to the available output space having being consumed.
-   The number of bits of output not provided are between 0 and 7, where they
-   await more bits to join them in order to fill out a full byte.  If pending
-   or bits are Z_NULL, then those values are not set.
-
-     deflatePending returns Z_OK if success, or Z_STREAM_ERROR if the source
-   stream state was inconsistent.
- */
-
-ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm,
-                                     int bits,
-                                     int value));
-/*
-     deflatePrime() inserts bits in the deflate output stream.  The intent
-   is that this function is used to start off the deflate output with the bits
-   leftover from a previous deflate stream when appending to it.  As such, this
-   function can only be used for raw deflate, and must be used before the first
-   deflate() call after a deflateInit2() or deflateReset().  bits must be less
-   than or equal to 16, and that many of the least significant bits of value
-   will be inserted in the output.
-
-     deflatePrime returns Z_OK if success, Z_BUF_ERROR if there was not enough
-   room in the internal buffer to insert the bits, or Z_STREAM_ERROR if the
-   source stream state was inconsistent.
-*/
-
-ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm,
-                                         gz_headerp head));
-/*
-     deflateSetHeader() provides gzip header information for when a gzip
-   stream is requested by deflateInit2().  deflateSetHeader() may be called
-   after deflateInit2() or deflateReset() and before the first call of
-   deflate().  The text, time, os, extra field, name, and comment information
-   in the provided gz_header structure are written to the gzip header (xflag is
-   ignored -- the extra flags are set according to the compression level).  The
-   caller must assure that, if not Z_NULL, name and comment are terminated with
-   a zero byte, and that if extra is not Z_NULL, that extra_len bytes are
-   available there.  If hcrc is true, a gzip header crc is included.  Note that
-   the current versions of the command-line version of gzip (up through version
-   1.3.x) do not support header crc's, and will report that it is a "multi-part
-   gzip file" and give up.
-
-     If deflateSetHeader is not used, the default gzip header has text false,
-   the time set to zero, and os set to 255, with no extra, name, or comment
-   fields.  The gzip header is returned to the default state by deflateReset().
-
-     deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
-   stream state was inconsistent.
-*/
-
-/*
-ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
-                                     int  windowBits));
-
-     This is another version of inflateInit with an extra parameter.  The
-   fields next_in, avail_in, zalloc, zfree and opaque must be initialized
-   before by the caller.
-
-     The windowBits parameter is the base two logarithm of the maximum window
-   size (the size of the history buffer).  It should be in the range 8..15 for
-   this version of the library.  The default value is 15 if inflateInit is used
-   instead.  windowBits must be greater than or equal to the windowBits value
-   provided to deflateInit2() while compressing, or it must be equal to 15 if
-   deflateInit2() was not used.  If a compressed stream with a larger window
-   size is given as input, inflate() will return with the error code
-   Z_DATA_ERROR instead of trying to allocate a larger window.
-
-     windowBits can also be zero to request that inflate use the window size in
-   the zlib header of the compressed stream.
-
-     windowBits can also be -8..-15 for raw inflate.  In this case, -windowBits
-   determines the window size.  inflate() will then process raw deflate data,
-   not looking for a zlib or gzip header, not generating a check value, and not
-   looking for any check values for comparison at the end of the stream.  This
-   is for use with other formats that use the deflate compressed data format
-   such as zip.  Those formats provide their own check values.  If a custom
-   format is developed using the raw deflate format for compressed data, it is
-   recommended that a check value such as an Adler-32 or a CRC-32 be applied to
-   the uncompressed data as is done in the zlib, gzip, and zip formats.  For
-   most applications, the zlib format should be used as is.  Note that comments
-   above on the use in deflateInit2() applies to the magnitude of windowBits.
-
-     windowBits can also be greater than 15 for optional gzip decoding.  Add
-   32 to windowBits to enable zlib and gzip decoding with automatic header
-   detection, or add 16 to decode only the gzip format (the zlib format will
-   return a Z_DATA_ERROR).  If a gzip stream is being decoded, strm->adler is a
-   CRC-32 instead of an Adler-32.  Unlike the gunzip utility and gzread() (see
-   below), inflate() will not automatically decode concatenated gzip streams.
-   inflate() will return Z_STREAM_END at the end of the gzip stream.  The state
-   would need to be reset to continue decoding a subsequent gzip stream.
-
-     inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
-   memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
-   version assumed by the caller, or Z_STREAM_ERROR if the parameters are
-   invalid, such as a null pointer to the structure.  msg is set to null if
-   there is no error message.  inflateInit2 does not perform any decompression
-   apart from possibly reading the zlib header if present: actual decompression
-   will be done by inflate().  (So next_in and avail_in may be modified, but
-   next_out and avail_out are unused and unchanged.) The current implementation
-   of inflateInit2() does not process any header information -- that is
-   deferred until inflate() is called.
-*/
-
-ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm,
-                                             const Bytef *dictionary,
-                                             uInt  dictLength));
-/*
-     Initializes the decompression dictionary from the given uncompressed byte
-   sequence.  This function must be called immediately after a call of inflate,
-   if that call returned Z_NEED_DICT.  The dictionary chosen by the compressor
-   can be determined from the Adler-32 value returned by that call of inflate.
-   The compressor and decompressor must use exactly the same dictionary (see
-   deflateSetDictionary).  For raw inflate, this function can be called at any
-   time to set the dictionary.  If the provided dictionary is smaller than the
-   window and there is already data in the window, then the provided dictionary
-   will amend what's there.  The application must insure that the dictionary
-   that was used for compression is provided.
-
-     inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
-   parameter is invalid (e.g.  dictionary being Z_NULL) or the stream state is
-   inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the
-   expected one (incorrect Adler-32 value).  inflateSetDictionary does not
-   perform any decompression: this will be done by subsequent calls of
-   inflate().
-*/
-
-ZEXTERN int ZEXPORT inflateGetDictionary OF((z_streamp strm,
-                                             Bytef *dictionary,
-                                             uInt  *dictLength));
-/*
-     Returns the sliding dictionary being maintained by inflate.  dictLength is
-   set to the number of bytes in the dictionary, and that many bytes are copied
-   to dictionary.  dictionary must have enough space, where 32768 bytes is
-   always enough.  If inflateGetDictionary() is called with dictionary equal to
-   Z_NULL, then only the dictionary length is returned, and nothing is copied.
-   Similary, if dictLength is Z_NULL, then it is not set.
-
-     inflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the
-   stream state is inconsistent.
-*/
-
-ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm));
-/*
-     Skips invalid compressed data until a possible full flush point (see above
-   for the description of deflate with Z_FULL_FLUSH) can be found, or until all
-   available input is skipped.  No output is provided.
-
-     inflateSync searches for a 00 00 FF FF pattern in the compressed data.
-   All full flush points have this pattern, but not all occurrences of this
-   pattern are full flush points.
-
-     inflateSync returns Z_OK if a possible full flush point has been found,
-   Z_BUF_ERROR if no more input was provided, Z_DATA_ERROR if no flush point
-   has been found, or Z_STREAM_ERROR if the stream structure was inconsistent.
-   In the success case, the application may save the current current value of
-   total_in which indicates where valid compressed data was found.  In the
-   error case, the application may repeatedly call inflateSync, providing more
-   input each time, until success or end of the input data.
-*/
-
-ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest,
-                                    z_streamp source));
-/*
-     Sets the destination stream as a complete copy of the source stream.
-
-     This function can be useful when randomly accessing a large stream.  The
-   first pass through the stream can periodically record the inflate state,
-   allowing restarting inflate at those points when randomly accessing the
-   stream.
-
-     inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
-   enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
-   (such as zalloc being Z_NULL).  msg is left unchanged in both source and
-   destination.
-*/
-
-ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm));
-/*
-     This function is equivalent to inflateEnd followed by inflateInit,
-   but does not free and reallocate the internal decompression state.  The
-   stream will keep attributes that may have been set by inflateInit2.
-
-     inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
-   stream state was inconsistent (such as zalloc or state being Z_NULL).
-*/
-
-ZEXTERN int ZEXPORT inflateReset2 OF((z_streamp strm,
-                                      int windowBits));
-/*
-     This function is the same as inflateReset, but it also permits changing
-   the wrap and window size requests.  The windowBits parameter is interpreted
-   the same as it is for inflateInit2.  If the window size is changed, then the
-   memory allocated for the window is freed, and the window will be reallocated
-   by inflate() if needed.
-
-     inflateReset2 returns Z_OK if success, or Z_STREAM_ERROR if the source
-   stream state was inconsistent (such as zalloc or state being Z_NULL), or if
-   the windowBits parameter is invalid.
-*/
-
-ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm,
-                                     int bits,
-                                     int value));
-/*
-     This function inserts bits in the inflate input stream.  The intent is
-   that this function is used to start inflating at a bit position in the
-   middle of a byte.  The provided bits will be used before any bytes are used
-   from next_in.  This function should only be used with raw inflate, and
-   should be used before the first inflate() call after inflateInit2() or
-   inflateReset().  bits must be less than or equal to 16, and that many of the
-   least significant bits of value will be inserted in the input.
-
-     If bits is negative, then the input stream bit buffer is emptied.  Then
-   inflatePrime() can be called again to put bits in the buffer.  This is used
-   to clear out bits leftover after feeding inflate a block description prior
-   to feeding inflate codes.
-
-     inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source
-   stream state was inconsistent.
-*/
-
-ZEXTERN long ZEXPORT inflateMark OF((z_streamp strm));
-/*
-     This function returns two values, one in the lower 16 bits of the return
-   value, and the other in the remaining upper bits, obtained by shifting the
-   return value down 16 bits.  If the upper value is -1 and the lower value is
-   zero, then inflate() is currently decoding information outside of a block.
-   If the upper value is -1 and the lower value is non-zero, then inflate is in
-   the middle of a stored block, with the lower value equaling the number of
-   bytes from the input remaining to copy.  If the upper value is not -1, then
-   it is the number of bits back from the current bit position in the input of
-   the code (literal or length/distance pair) currently being processed.  In
-   that case the lower value is the number of bytes already emitted for that
-   code.
-
-     A code is being processed if inflate is waiting for more input to complete
-   decoding of the code, or if it has completed decoding but is waiting for
-   more output space to write the literal or match data.
-
-     inflateMark() is used to mark locations in the input data for random
-   access, which may be at bit positions, and to note those cases where the
-   output of a code may span boundaries of random access blocks.  The current
-   location in the input stream can be determined from avail_in and data_type
-   as noted in the description for the Z_BLOCK flush parameter for inflate.
-
-     inflateMark returns the value noted above, or -65536 if the provided
-   source stream state was inconsistent.
-*/
-
-ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm,
-                                         gz_headerp head));
-/*
-     inflateGetHeader() requests that gzip header information be stored in the
-   provided gz_header structure.  inflateGetHeader() may be called after
-   inflateInit2() or inflateReset(), and before the first call of inflate().
-   As inflate() processes the gzip stream, head->done is zero until the header
-   is completed, at which time head->done is set to one.  If a zlib stream is
-   being decoded, then head->done is set to -1 to indicate that there will be
-   no gzip header information forthcoming.  Note that Z_BLOCK or Z_TREES can be
-   used to force inflate() to return immediately after header processing is
-   complete and before any actual data is decompressed.
-
-     The text, time, xflags, and os fields are filled in with the gzip header
-   contents.  hcrc is set to true if there is a header CRC.  (The header CRC
-   was valid if done is set to one.) If extra is not Z_NULL, then extra_max
-   contains the maximum number of bytes to write to extra.  Once done is true,
-   extra_len contains the actual extra field length, and extra contains the
-   extra field, or that field truncated if extra_max is less than extra_len.
-   If name is not Z_NULL, then up to name_max characters are written there,
-   terminated with a zero unless the length is greater than name_max.  If
-   comment is not Z_NULL, then up to comm_max characters are written there,
-   terminated with a zero unless the length is greater than comm_max.  When any
-   of extra, name, or comment are not Z_NULL and the respective field is not
-   present in the header, then that field is set to Z_NULL to signal its
-   absence.  This allows the use of deflateSetHeader() with the returned
-   structure to duplicate the header.  However if those fields are set to
-   allocated memory, then the application will need to save those pointers
-   elsewhere so that they can be eventually freed.
-
-     If inflateGetHeader is not used, then the header information is simply
-   discarded.  The header is always checked for validity, including the header
-   CRC if present.  inflateReset() will reset the process to discard the header
-   information.  The application would need to call inflateGetHeader() again to
-   retrieve the header from the next gzip stream.
-
-     inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
-   stream state was inconsistent.
-*/
-
-/*
-ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits,
-                                        unsigned char FAR *window));
-
-     Initialize the internal stream state for decompression using inflateBack()
-   calls.  The fields zalloc, zfree and opaque in strm must be initialized
-   before the call.  If zalloc and zfree are Z_NULL, then the default library-
-   derived memory allocation routines are used.  windowBits is the base two
-   logarithm of the window size, in the range 8..15.  window is a caller
-   supplied buffer of that size.  Except for special applications where it is
-   assured that deflate was used with small window sizes, windowBits must be 15
-   and a 32K byte window must be supplied to be able to decompress general
-   deflate streams.
-
-     See inflateBack() for the usage of these routines.
-
-     inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of
-   the parameters are invalid, Z_MEM_ERROR if the internal state could not be
-   allocated, or Z_VERSION_ERROR if the version of the library does not match
-   the version of the header file.
-*/
-
-typedef unsigned (*in_func) OF((void FAR *,
-                                z_const unsigned char FAR * FAR *));
-typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned));
-
-ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm,
-                                    in_func in, void FAR *in_desc,
-                                    out_func out, void FAR *out_desc));
-/*
-     inflateBack() does a raw inflate with a single call using a call-back
-   interface for input and output.  This is potentially more efficient than
-   inflate() for file i/o applications, in that it avoids copying between the
-   output and the sliding window by simply making the window itself the output
-   buffer.  inflate() can be faster on modern CPUs when used with large
-   buffers.  inflateBack() trusts the application to not change the output
-   buffer passed by the output function, at least until inflateBack() returns.
-
-     inflateBackInit() must be called first to allocate the internal state
-   and to initialize the state with the user-provided window buffer.
-   inflateBack() may then be used multiple times to inflate a complete, raw
-   deflate stream with each call.  inflateBackEnd() is then called to free the
-   allocated state.
-
-     A raw deflate stream is one with no zlib or gzip header or trailer.
-   This routine would normally be used in a utility that reads zip or gzip
-   files and writes out uncompressed files.  The utility would decode the
-   header and process the trailer on its own, hence this routine expects only
-   the raw deflate stream to decompress.  This is different from the default
-   behavior of inflate(), which expects a zlib header and trailer around the
-   deflate stream.
-
-     inflateBack() uses two subroutines supplied by the caller that are then
-   called by inflateBack() for input and output.  inflateBack() calls those
-   routines until it reads a complete deflate stream and writes out all of the
-   uncompressed data, or until it encounters an error.  The function's
-   parameters and return types are defined above in the in_func and out_func
-   typedefs.  inflateBack() will call in(in_desc, &buf) which should return the
-   number of bytes of provided input, and a pointer to that input in buf.  If
-   there is no input available, in() must return zero -- buf is ignored in that
-   case -- and inflateBack() will return a buffer error.  inflateBack() will
-   call out(out_desc, buf, len) to write the uncompressed data buf[0..len-1].
-   out() should return zero on success, or non-zero on failure.  If out()
-   returns non-zero, inflateBack() will return with an error.  Neither in() nor
-   out() are permitted to change the contents of the window provided to
-   inflateBackInit(), which is also the buffer that out() uses to write from.
-   The length written by out() will be at most the window size.  Any non-zero
-   amount of input may be provided by in().
-
-     For convenience, inflateBack() can be provided input on the first call by
-   setting strm->next_in and strm->avail_in.  If that input is exhausted, then
-   in() will be called.  Therefore strm->next_in must be initialized before
-   calling inflateBack().  If strm->next_in is Z_NULL, then in() will be called
-   immediately for input.  If strm->next_in is not Z_NULL, then strm->avail_in
-   must also be initialized, and then if strm->avail_in is not zero, input will
-   initially be taken from strm->next_in[0 ..  strm->avail_in - 1].
-
-     The in_desc and out_desc parameters of inflateBack() is passed as the
-   first parameter of in() and out() respectively when they are called.  These
-   descriptors can be optionally used to pass any information that the caller-
-   supplied in() and out() functions need to do their job.
-
-     On return, inflateBack() will set strm->next_in and strm->avail_in to
-   pass back any unused input that was provided by the last in() call.  The
-   return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR
-   if in() or out() returned an error, Z_DATA_ERROR if there was a format error
-   in the deflate stream (in which case strm->msg is set to indicate the nature
-   of the error), or Z_STREAM_ERROR if the stream was not properly initialized.
-   In the case of Z_BUF_ERROR, an input or output error can be distinguished
-   using strm->next_in which will be Z_NULL only if in() returned an error.  If
-   strm->next_in is not Z_NULL, then the Z_BUF_ERROR was due to out() returning
-   non-zero.  (in() will always be called before out(), so strm->next_in is
-   assured to be defined if out() returns non-zero.)  Note that inflateBack()
-   cannot return Z_OK.
-*/
-
-ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm));
-/*
-     All memory allocated by inflateBackInit() is freed.
-
-     inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream
-   state was inconsistent.
-*/
-
-ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void));
-/* Return flags indicating compile-time options.
-
-    Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other:
-     1.0: size of uInt
-     3.2: size of uLong
-     5.4: size of voidpf (pointer)
-     7.6: size of z_off_t
-
-    Compiler, assembler, and debug options:
-     8: ZLIB_DEBUG
-     9: ASMV or ASMINF -- use ASM code
-     10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention
-     11: 0 (reserved)
-
-    One-time table building (smaller code, but not thread-safe if true):
-     12: BUILDFIXED -- build static block decoding tables when needed
-     13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed
-     14,15: 0 (reserved)
-
-    Library content (indicates missing functionality):
-     16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking
-                          deflate code when not needed)
-     17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect
-                    and decode gzip streams (to avoid linking crc code)
-     18-19: 0 (reserved)
-
-    Operation variations (changes in library functionality):
-     20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate
-     21: FASTEST -- deflate algorithm with only one, lowest compression level
-     22,23: 0 (reserved)
-
-    The sprintf variant used by gzprintf (zero is best):
-     24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format
-     25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure!
-     26: 0 = returns value, 1 = void -- 1 means inferred string length returned
-
-    Remainder:
-     27-31: 0 (reserved)
- */
-
-#ifndef Z_SOLO
-
-                        /* utility functions */
-
-/*
-     The following utility functions are implemented on top of the basic
-   stream-oriented functions.  To simplify the interface, some default options
-   are assumed (compression level and memory usage, standard memory allocation
-   functions).  The source code of these utility functions can be modified if
-   you need special options.
-*/
-
-ZEXTERN int ZEXPORT compress OF((Bytef *dest,   uLongf *destLen,
-                                 const Bytef *source, uLong sourceLen));
-/*
-     Compresses the source buffer into the destination buffer.  sourceLen is
-   the byte length of the source buffer.  Upon entry, destLen is the total size
-   of the destination buffer, which must be at least the value returned by
-   compressBound(sourceLen).  Upon exit, destLen is the actual size of the
-   compressed data.  compress() is equivalent to compress2() with a level
-   parameter of Z_DEFAULT_COMPRESSION.
-
-     compress returns Z_OK if success, Z_MEM_ERROR if there was not
-   enough memory, Z_BUF_ERROR if there was not enough room in the output
-   buffer.
-*/
-
-ZEXTERN int ZEXPORT compress2 OF((Bytef *dest,   uLongf *destLen,
-                                  const Bytef *source, uLong sourceLen,
-                                  int level));
-/*
-     Compresses the source buffer into the destination buffer.  The level
-   parameter has the same meaning as in deflateInit.  sourceLen is the byte
-   length of the source buffer.  Upon entry, destLen is the total size of the
-   destination buffer, which must be at least the value returned by
-   compressBound(sourceLen).  Upon exit, destLen is the actual size of the
-   compressed data.
-
-     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
-   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
-   Z_STREAM_ERROR if the level parameter is invalid.
-*/
-
-ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen));
-/*
-     compressBound() returns an upper bound on the compressed size after
-   compress() or compress2() on sourceLen bytes.  It would be used before a
-   compress() or compress2() call to allocate the destination buffer.
-*/
-
-ZEXTERN int ZEXPORT uncompress OF((Bytef *dest,   uLongf *destLen,
-                                   const Bytef *source, uLong sourceLen));
-/*
-     Decompresses the source buffer into the destination buffer.  sourceLen is
-   the byte length of the source buffer.  Upon entry, destLen is the total size
-   of the destination buffer, which must be large enough to hold the entire
-   uncompressed data.  (The size of the uncompressed data must have been saved
-   previously by the compressor and transmitted to the decompressor by some
-   mechanism outside the scope of this compression library.) Upon exit, destLen
-   is the actual size of the uncompressed data.
-
-     uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
-   enough memory, Z_BUF_ERROR if there was not enough room in the output
-   buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete.  In
-   the case where there is not enough room, uncompress() will fill the output
-   buffer with the uncompressed data up to that point.
-*/
-
-ZEXTERN int ZEXPORT uncompress2 OF((Bytef *dest,   uLongf *destLen,
-                                    const Bytef *source, uLong *sourceLen));
-/*
-     Same as uncompress, except that sourceLen is a pointer, where the
-   length of the source is *sourceLen.  On return, *sourceLen is the number of
-   source bytes consumed.
-*/
-
-                        /* gzip file access functions */
-
-/*
-     This library supports reading and writing files in gzip (.gz) format with
-   an interface similar to that of stdio, using the functions that start with
-   "gz".  The gzip format is different from the zlib format.  gzip is a gzip
-   wrapper, documented in RFC 1952, wrapped around a deflate stream.
-*/
-
-typedef struct gzFile_s *gzFile;    /* semi-opaque gzip file descriptor */
-
-/*
-ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode));
-
-     Opens a gzip (.gz) file for reading or writing.  The mode parameter is as
-   in fopen ("rb" or "wb") but can also include a compression level ("wb9") or
-   a strategy: 'f' for filtered data as in "wb6f", 'h' for Huffman-only
-   compression as in "wb1h", 'R' for run-length encoding as in "wb1R", or 'F'
-   for fixed code compression as in "wb9F".  (See the description of
-   deflateInit2 for more information about the strategy parameter.)  'T' will
-   request transparent writing or appending with no compression and not using
-   the gzip format.
-
-     "a" can be used instead of "w" to request that the gzip stream that will
-   be written be appended to the file.  "+" will result in an error, since
-   reading and writing to the same gzip file is not supported.  The addition of
-   "x" when writing will create the file exclusively, which fails if the file
-   already exists.  On systems that support it, the addition of "e" when
-   reading or writing will set the flag to close the file on an execve() call.
-
-     These functions, as well as gzip, will read and decode a sequence of gzip
-   streams in a file.  The append function of gzopen() can be used to create
-   such a file.  (Also see gzflush() for another way to do this.)  When
-   appending, gzopen does not test whether the file begins with a gzip stream,
-   nor does it look for the end of the gzip streams to begin appending.  gzopen
-   will simply append a gzip stream to the existing file.
-
-     gzopen can be used to read a file which is not in gzip format; in this
-   case gzread will directly read from the file without decompression.  When
-   reading, this will be detected automatically by looking for the magic two-
-   byte gzip header.
-
-     gzopen returns NULL if the file could not be opened, if there was
-   insufficient memory to allocate the gzFile state, or if an invalid mode was
-   specified (an 'r', 'w', or 'a' was not provided, or '+' was provided).
-   errno can be checked to determine if the reason gzopen failed was that the
-   file could not be opened.
-*/
-
-ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode));
-/*
-     gzdopen associates a gzFile with the file descriptor fd.  File descriptors
-   are obtained from calls like open, dup, creat, pipe or fileno (if the file
-   has been previously opened with fopen).  The mode parameter is as in gzopen.
-
-     The next call of gzclose on the returned gzFile will also close the file
-   descriptor fd, just like fclose(fdopen(fd, mode)) closes the file descriptor
-   fd.  If you want to keep fd open, use fd = dup(fd_keep); gz = gzdopen(fd,
-   mode);.  The duplicated descriptor should be saved to avoid a leak, since
-   gzdopen does not close fd if it fails.  If you are using fileno() to get the
-   file descriptor from a FILE *, then you will have to use dup() to avoid
-   double-close()ing the file descriptor.  Both gzclose() and fclose() will
-   close the associated file descriptor, so they need to have different file
-   descriptors.
-
-     gzdopen returns NULL if there was insufficient memory to allocate the
-   gzFile state, if an invalid mode was specified (an 'r', 'w', or 'a' was not
-   provided, or '+' was provided), or if fd is -1.  The file descriptor is not
-   used until the next gz* read, write, seek, or close operation, so gzdopen
-   will not detect if fd is invalid (unless fd is -1).
-*/
-
-ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size));
-/*
-     Set the internal buffer size used by this library's functions.  The
-   default buffer size is 8192 bytes.  This function must be called after
-   gzopen() or gzdopen(), and before any other calls that read or write the
-   file.  The buffer memory allocation is always deferred to the first read or
-   write.  Three times that size in buffer space is allocated.  A larger buffer
-   size of, for example, 64K or 128K bytes will noticeably increase the speed
-   of decompression (reading).
-
-     The new buffer size also affects the maximum length for gzprintf().
-
-     gzbuffer() returns 0 on success, or -1 on failure, such as being called
-   too late.
-*/
-
-ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy));
-/*
-     Dynamically update the compression level or strategy.  See the description
-   of deflateInit2 for the meaning of these parameters.  Previously provided
-   data is flushed before the parameter change.
-
-     gzsetparams returns Z_OK if success, Z_STREAM_ERROR if the file was not
-   opened for writing, Z_ERRNO if there is an error writing the flushed data,
-   or Z_MEM_ERROR if there is a memory allocation error.
-*/
-
-ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len));
-/*
-     Reads the given number of uncompressed bytes from the compressed file.  If
-   the input file is not in gzip format, gzread copies the given number of
-   bytes into the buffer directly from the file.
-
-     After reaching the end of a gzip stream in the input, gzread will continue
-   to read, looking for another gzip stream.  Any number of gzip streams may be
-   concatenated in the input file, and will all be decompressed by gzread().
-   If something other than a gzip stream is encountered after a gzip stream,
-   that remaining trailing garbage is ignored (and no error is returned).
-
-     gzread can be used to read a gzip file that is being concurrently written.
-   Upon reaching the end of the input, gzread will return with the available
-   data.  If the error code returned by gzerror is Z_OK or Z_BUF_ERROR, then
-   gzclearerr can be used to clear the end of file indicator in order to permit
-   gzread to be tried again.  Z_OK indicates that a gzip stream was completed
-   on the last gzread.  Z_BUF_ERROR indicates that the input file ended in the
-   middle of a gzip stream.  Note that gzread does not return -1 in the event
-   of an incomplete gzip stream.  This error is deferred until gzclose(), which
-   will return Z_BUF_ERROR if the last gzread ended in the middle of a gzip
-   stream.  Alternatively, gzerror can be used before gzclose to detect this
-   case.
-
-     gzread returns the number of uncompressed bytes actually read, less than
-   len for end of file, or -1 for error.  If len is too large to fit in an int,
-   then nothing is read, -1 is returned, and the error state is set to
-   Z_STREAM_ERROR.
-*/
-
-ZEXTERN z_size_t ZEXPORT gzfread OF((voidp buf, z_size_t size, z_size_t nitems,
-                                     gzFile file));
-/*
-     Read up to nitems items of size size from file to buf, otherwise operating
-   as gzread() does.  This duplicates the interface of stdio's fread(), with
-   size_t request and return types.  If the library defines size_t, then
-   z_size_t is identical to size_t.  If not, then z_size_t is an unsigned
-   integer type that can contain a pointer.
-
-     gzfread() returns the number of full items read of size size, or zero if
-   the end of the file was reached and a full item could not be read, or if
-   there was an error.  gzerror() must be consulted if zero is returned in
-   order to determine if there was an error.  If the multiplication of size and
-   nitems overflows, i.e. the product does not fit in a z_size_t, then nothing
-   is read, zero is returned, and the error state is set to Z_STREAM_ERROR.
-
-     In the event that the end of file is reached and only a partial item is
-   available at the end, i.e. the remaining uncompressed data length is not a
-   multiple of size, then the final partial item is nevetheless read into buf
-   and the end-of-file flag is set.  The length of the partial item read is not
-   provided, but could be inferred from the result of gztell().  This behavior
-   is the same as the behavior of fread() implementations in common libraries,
-   but it prevents the direct use of gzfread() to read a concurrently written
-   file, reseting and retrying on end-of-file, when size is not 1.
-*/
-
-ZEXTERN int ZEXPORT gzwrite OF((gzFile file,
-                                voidpc buf, unsigned len));
-/*
-     Writes the given number of uncompressed bytes into the compressed file.
-   gzwrite returns the number of uncompressed bytes written or 0 in case of
-   error.
-*/
-
-ZEXTERN z_size_t ZEXPORT gzfwrite OF((voidpc buf, z_size_t size,
-                                      z_size_t nitems, gzFile file));
-/*
-     gzfwrite() writes nitems items of size size from buf to file, duplicating
-   the interface of stdio's fwrite(), with size_t request and return types.  If
-   the library defines size_t, then z_size_t is identical to size_t.  If not,
-   then z_size_t is an unsigned integer type that can contain a pointer.
-
-     gzfwrite() returns the number of full items written of size size, or zero
-   if there was an error.  If the multiplication of size and nitems overflows,
-   i.e. the product does not fit in a z_size_t, then nothing is written, zero
-   is returned, and the error state is set to Z_STREAM_ERROR.
-*/
-
-ZEXTERN int ZEXPORTVA gzprintf Z_ARG((gzFile file, const char *format, ...));
-/*
-     Converts, formats, and writes the arguments to the compressed file under
-   control of the format string, as in fprintf.  gzprintf returns the number of
-   uncompressed bytes actually written, or a negative zlib error code in case
-   of error.  The number of uncompressed bytes written is limited to 8191, or
-   one less than the buffer size given to gzbuffer().  The caller should assure
-   that this limit is not exceeded.  If it is exceeded, then gzprintf() will
-   return an error (0) with nothing written.  In this case, there may also be a
-   buffer overflow with unpredictable consequences, which is possible only if
-   zlib was compiled with the insecure functions sprintf() or vsprintf()
-   because the secure snprintf() or vsnprintf() functions were not available.
-   This can be determined using zlibCompileFlags().
-*/
-
-ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s));
-/*
-     Writes the given null-terminated string to the compressed file, excluding
-   the terminating null character.
-
-     gzputs returns the number of characters written, or -1 in case of error.
-*/
-
-ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len));
-/*
-     Reads bytes from the compressed file until len-1 characters are read, or a
-   newline character is read and transferred to buf, or an end-of-file
-   condition is encountered.  If any characters are read or if len == 1, the
-   string is terminated with a null character.  If no characters are read due
-   to an end-of-file or len < 1, then the buffer is left untouched.
-
-     gzgets returns buf which is a null-terminated string, or it returns NULL
-   for end-of-file or in case of error.  If there was an error, the contents at
-   buf are indeterminate.
-*/
-
-ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c));
-/*
-     Writes c, converted to an unsigned char, into the compressed file.  gzputc
-   returns the value that was written, or -1 in case of error.
-*/
-
-ZEXTERN int ZEXPORT gzgetc OF((gzFile file));
-/*
-     Reads one byte from the compressed file.  gzgetc returns this byte or -1
-   in case of end of file or error.  This is implemented as a macro for speed.
-   As such, it does not do all of the checking the other functions do.  I.e.
-   it does not check to see if file is NULL, nor whether the structure file
-   points to has been clobbered or not.
-*/
-
-ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file));
-/*
-     Push one character back onto the stream to be read as the first character
-   on the next read.  At least one character of push-back is allowed.
-   gzungetc() returns the character pushed, or -1 on failure.  gzungetc() will
-   fail if c is -1, and may fail if a character has been pushed but not read
-   yet.  If gzungetc is used immediately after gzopen or gzdopen, at least the
-   output buffer size of pushed characters is allowed.  (See gzbuffer above.)
-   The pushed character will be discarded if the stream is repositioned with
-   gzseek() or gzrewind().
-*/
-
-ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush));
-/*
-     Flushes all pending output into the compressed file.  The parameter flush
-   is as in the deflate() function.  The return value is the zlib error number
-   (see function gzerror below).  gzflush is only permitted when writing.
-
-     If the flush parameter is Z_FINISH, the remaining data is written and the
-   gzip stream is completed in the output.  If gzwrite() is called again, a new
-   gzip stream will be started in the output.  gzread() is able to read such
-   concatenated gzip streams.
-
-     gzflush should be called only when strictly necessary because it will
-   degrade compression if called too often.
-*/
-
-/*
-ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file,
-                                   z_off_t offset, int whence));
-
-     Sets the starting position for the next gzread or gzwrite on the given
-   compressed file.  The offset represents a number of bytes in the
-   uncompressed data stream.  The whence parameter is defined as in lseek(2);
-   the value SEEK_END is not supported.
-
-     If the file is opened for reading, this function is emulated but can be
-   extremely slow.  If the file is opened for writing, only forward seeks are
-   supported; gzseek then compresses a sequence of zeroes up to the new
-   starting position.
-
-     gzseek returns the resulting offset location as measured in bytes from
-   the beginning of the uncompressed stream, or -1 in case of error, in
-   particular if the file is opened for writing and the new starting position
-   would be before the current position.
-*/
-
-ZEXTERN int ZEXPORT    gzrewind OF((gzFile file));
-/*
-     Rewinds the given file. This function is supported only for reading.
-
-     gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET)
-*/
-
-/*
-ZEXTERN z_off_t ZEXPORT    gztell OF((gzFile file));
-
-     Returns the starting position for the next gzread or gzwrite on the given
-   compressed file.  This position represents a number of bytes in the
-   uncompressed data stream, and is zero when starting, even if appending or
-   reading a gzip stream from the middle of a file using gzdopen().
-
-     gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR)
-*/
-
-/*
-ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile file));
-
-     Returns the current offset in the file being read or written.  This offset
-   includes the count of bytes that precede the gzip stream, for example when
-   appending or when using gzdopen() for reading.  When reading, the offset
-   does not include as yet unused buffered input.  This information can be used
-   for a progress indicator.  On error, gzoffset() returns -1.
-*/
-
-ZEXTERN int ZEXPORT gzeof OF((gzFile file));
-/*
-     Returns true (1) if the end-of-file indicator has been set while reading,
-   false (0) otherwise.  Note that the end-of-file indicator is set only if the
-   read tried to go past the end of the input, but came up short.  Therefore,
-   just like feof(), gzeof() may return false even if there is no more data to
-   read, in the event that the last read request was for the exact number of
-   bytes remaining in the input file.  This will happen if the input file size
-   is an exact multiple of the buffer size.
-
-     If gzeof() returns true, then the read functions will return no more data,
-   unless the end-of-file indicator is reset by gzclearerr() and the input file
-   has grown since the previous end of file was detected.
-*/
-
-ZEXTERN int ZEXPORT gzdirect OF((gzFile file));
-/*
-     Returns true (1) if file is being copied directly while reading, or false
-   (0) if file is a gzip stream being decompressed.
-
-     If the input file is empty, gzdirect() will return true, since the input
-   does not contain a gzip stream.
-
-     If gzdirect() is used immediately after gzopen() or gzdopen() it will
-   cause buffers to be allocated to allow reading the file to determine if it
-   is a gzip file.  Therefore if gzbuffer() is used, it should be called before
-   gzdirect().
-
-     When writing, gzdirect() returns true (1) if transparent writing was
-   requested ("wT" for the gzopen() mode), or false (0) otherwise.  (Note:
-   gzdirect() is not needed when writing.  Transparent writing must be
-   explicitly requested, so the application already knows the answer.  When
-   linking statically, using gzdirect() will include all of the zlib code for
-   gzip file reading and decompression, which may not be desired.)
-*/
-
-ZEXTERN int ZEXPORT    gzclose OF((gzFile file));
-/*
-     Flushes all pending output if necessary, closes the compressed file and
-   deallocates the (de)compression state.  Note that once file is closed, you
-   cannot call gzerror with file, since its structures have been deallocated.
-   gzclose must not be called more than once on the same file, just as free
-   must not be called more than once on the same allocation.
-
-     gzclose will return Z_STREAM_ERROR if file is not valid, Z_ERRNO on a
-   file operation error, Z_MEM_ERROR if out of memory, Z_BUF_ERROR if the
-   last read ended in the middle of a gzip stream, or Z_OK on success.
-*/
-
-ZEXTERN int ZEXPORT gzclose_r OF((gzFile file));
-ZEXTERN int ZEXPORT gzclose_w OF((gzFile file));
-/*
-     Same as gzclose(), but gzclose_r() is only for use when reading, and
-   gzclose_w() is only for use when writing or appending.  The advantage to
-   using these instead of gzclose() is that they avoid linking in zlib
-   compression or decompression code that is not used when only reading or only
-   writing respectively.  If gzclose() is used, then both compression and
-   decompression code will be included the application when linking to a static
-   zlib library.
-*/
-
-ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum));
-/*
-     Returns the error message for the last error which occurred on the given
-   compressed file.  errnum is set to zlib error number.  If an error occurred
-   in the file system and not in the compression library, errnum is set to
-   Z_ERRNO and the application may consult errno to get the exact error code.
-
-     The application must not modify the returned string.  Future calls to
-   this function may invalidate the previously returned string.  If file is
-   closed, then the string previously returned by gzerror will no longer be
-   available.
-
-     gzerror() should be used to distinguish errors from end-of-file for those
-   functions above that do not distinguish those cases in their return values.
-*/
-
-ZEXTERN void ZEXPORT gzclearerr OF((gzFile file));
-/*
-     Clears the error and end-of-file flags for file.  This is analogous to the
-   clearerr() function in stdio.  This is useful for continuing to read a gzip
-   file that is being written concurrently.
-*/
-
-#endif /* !Z_SOLO */
-
-                        /* checksum functions */
-
-/*
-     These functions are not related to compression but are exported
-   anyway because they might be useful in applications using the compression
-   library.
-*/
-
-ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
-/*
-     Update a running Adler-32 checksum with the bytes buf[0..len-1] and
-   return the updated checksum.  If buf is Z_NULL, this function returns the
-   required initial value for the checksum.
-
-     An Adler-32 checksum is almost as reliable as a CRC-32 but can be computed
-   much faster.
-
-   Usage example:
-
-     uLong adler = adler32(0L, Z_NULL, 0);
-
-     while (read_buffer(buffer, length) != EOF) {
-       adler = adler32(adler, buffer, length);
-     }
-     if (adler != original_adler) error();
-*/
-
-ZEXTERN uLong ZEXPORT adler32_z OF((uLong adler, const Bytef *buf,
-                                    z_size_t len));
-/*
-     Same as adler32(), but with a size_t length.
-*/
-
-/*
-ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2,
-                                          z_off_t len2));
-
-     Combine two Adler-32 checksums into one.  For two sequences of bytes, seq1
-   and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for
-   each, adler1 and adler2.  adler32_combine() returns the Adler-32 checksum of
-   seq1 and seq2 concatenated, requiring only adler1, adler2, and len2.  Note
-   that the z_off_t type (like off_t) is a signed integer.  If len2 is
-   negative, the result has no meaning or utility.
-*/
-
-ZEXTERN uLong ZEXPORT crc32   OF((uLong crc, const Bytef *buf, uInt len));
-/*
-     Update a running CRC-32 with the bytes buf[0..len-1] and return the
-   updated CRC-32.  If buf is Z_NULL, this function returns the required
-   initial value for the crc.  Pre- and post-conditioning (one's complement) is
-   performed within this function so it shouldn't be done by the application.
-
-   Usage example:
-
-     uLong crc = crc32(0L, Z_NULL, 0);
-
-     while (read_buffer(buffer, length) != EOF) {
-       crc = crc32(crc, buffer, length);
-     }
-     if (crc != original_crc) error();
-*/
-
-ZEXTERN uLong ZEXPORT crc32_z OF((uLong adler, const Bytef *buf,
-                                  z_size_t len));
-/*
-     Same as crc32(), but with a size_t length.
-*/
-
-/*
-ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2));
-
-     Combine two CRC-32 check values into one.  For two sequences of bytes,
-   seq1 and seq2 with lengths len1 and len2, CRC-32 check values were
-   calculated for each, crc1 and crc2.  crc32_combine() returns the CRC-32
-   check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and
-   len2.
-*/
-
-
-                        /* various hacks, don't look :) */
-
-/* deflateInit and inflateInit are macros to allow checking the zlib version
- * and the compiler's view of z_stream:
- */
-ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level,
-                                     const char *version, int stream_size));
-ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm,
-                                     const char *version, int stream_size));
-ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int  level, int  method,
-                                      int windowBits, int memLevel,
-                                      int strategy, const char *version,
-                                      int stream_size));
-ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int  windowBits,
-                                      const char *version, int stream_size));
-ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
-                                         unsigned char FAR *window,
-                                         const char *version,
-                                         int stream_size));
-#ifdef Z_PREFIX_SET
-#  define z_deflateInit(strm, level) \
-          deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream))
-#  define z_inflateInit(strm) \
-          inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream))
-#  define z_deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
-          deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
-                        (strategy), ZLIB_VERSION, (int)sizeof(z_stream))
-#  define z_inflateInit2(strm, windowBits) \
-          inflateInit2_((strm), (windowBits), ZLIB_VERSION, \
-                        (int)sizeof(z_stream))
-#  define z_inflateBackInit(strm, windowBits, window) \
-          inflateBackInit_((strm), (windowBits), (window), \
-                           ZLIB_VERSION, (int)sizeof(z_stream))
-#else
-#  define deflateInit(strm, level) \
-          deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream))
-#  define inflateInit(strm) \
-          inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream))
-#  define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
-          deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
-                        (strategy), ZLIB_VERSION, (int)sizeof(z_stream))
-#  define inflateInit2(strm, windowBits) \
-          inflateInit2_((strm), (windowBits), ZLIB_VERSION, \
-                        (int)sizeof(z_stream))
-#  define inflateBackInit(strm, windowBits, window) \
-          inflateBackInit_((strm), (windowBits), (window), \
-                           ZLIB_VERSION, (int)sizeof(z_stream))
-#endif
-
-#ifndef Z_SOLO
-
-/* gzgetc() macro and its supporting function and exposed data structure.  Note
- * that the real internal state is much larger than the exposed structure.
- * This abbreviated structure exposes just enough for the gzgetc() macro.  The
- * user should not mess with these exposed elements, since their names or
- * behavior could change in the future, perhaps even capriciously.  They can
- * only be used by the gzgetc() macro.  You have been warned.
- */
-struct gzFile_s {
-    unsigned have;
-    unsigned char *next;
-    z_off64_t pos;
-};
-ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file));  /* backward compatibility */
-#ifdef Z_PREFIX_SET
-#  undef z_gzgetc
-#  define z_gzgetc(g) \
-          ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g))
-#else
-#  define gzgetc(g) \
-          ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g))
-#endif
-
-/* provide 64-bit offset functions if _LARGEFILE64_SOURCE defined, and/or
- * change the regular functions to 64 bits if _FILE_OFFSET_BITS is 64 (if
- * both are true, the application gets the *64 functions, and the regular
- * functions are changed to 64 bits) -- in case these are set on systems
- * without large file support, _LFS64_LARGEFILE must also be true
- */
-#ifdef Z_LARGE64
-   ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
-   ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
-   ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
-   ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
-   ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t));
-   ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t));
-#endif
-
-#if !defined(ZLIB_INTERNAL) && defined(Z_WANT64)
-#  ifdef Z_PREFIX_SET
-#    define z_gzopen z_gzopen64
-#    define z_gzseek z_gzseek64
-#    define z_gztell z_gztell64
-#    define z_gzoffset z_gzoffset64
-#    define z_adler32_combine z_adler32_combine64
-#    define z_crc32_combine z_crc32_combine64
-#  else
-#    define gzopen gzopen64
-#    define gzseek gzseek64
-#    define gztell gztell64
-#    define gzoffset gzoffset64
-#    define adler32_combine adler32_combine64
-#    define crc32_combine crc32_combine64
-#  endif
-#  ifndef Z_LARGE64
-     ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
-     ZEXTERN z_off_t ZEXPORT gzseek64 OF((gzFile, z_off_t, int));
-     ZEXTERN z_off_t ZEXPORT gztell64 OF((gzFile));
-     ZEXTERN z_off_t ZEXPORT gzoffset64 OF((gzFile));
-     ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
-     ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
-#  endif
-#else
-   ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *));
-   ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile, z_off_t, int));
-   ZEXTERN z_off_t ZEXPORT gztell OF((gzFile));
-   ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile));
-   ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
-   ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
-#endif
-
-#else /* Z_SOLO */
-
-   ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
-   ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
-
-#endif /* !Z_SOLO */
-
-/* undocumented functions */
-ZEXTERN const char   * ZEXPORT zError           OF((int));
-ZEXTERN int            ZEXPORT inflateSyncPoint OF((z_streamp));
-ZEXTERN const z_crc_t FAR * ZEXPORT get_crc_table    OF((void));
-ZEXTERN int            ZEXPORT inflateUndermine OF((z_streamp, int));
-ZEXTERN int            ZEXPORT inflateValidate OF((z_streamp, int));
-ZEXTERN unsigned long  ZEXPORT inflateCodesUsed OF ((z_streamp));
-ZEXTERN int            ZEXPORT inflateResetKeep OF((z_streamp));
-ZEXTERN int            ZEXPORT deflateResetKeep OF((z_streamp));
-#if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(Z_SOLO)
-ZEXTERN gzFile         ZEXPORT gzopen_w OF((const wchar_t *path,
-                                            const char *mode));
-#endif
-#if defined(STDC) || defined(Z_HAVE_STDARG_H)
-#  ifndef Z_SOLO
-ZEXTERN int            ZEXPORTVA gzvprintf Z_ARG((gzFile file,
-                                                  const char *format,
-                                                  va_list va));
-#  endif
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* ZLIB_H */
diff --git a/src/png/zlib/zlib.map b/src/png/zlib/zlib.map
deleted file mode 100644
index 82ce98cf7..000000000
--- a/src/png/zlib/zlib.map
+++ /dev/null
@@ -1,94 +0,0 @@
-ZLIB_1.2.0 {
-  global:
-    compressBound;
-    deflateBound;
-    inflateBack;
-    inflateBackEnd;
-    inflateBackInit_;
-    inflateCopy;
-  local:
-    deflate_copyright;
-    inflate_copyright;
-    inflate_fast;
-    inflate_table;
-    zcalloc;
-    zcfree;
-    z_errmsg;
-    gz_error;
-    gz_intmax;
-    _*;
-};
-
-ZLIB_1.2.0.2 {
-    gzclearerr;
-    gzungetc;
-    zlibCompileFlags;
-} ZLIB_1.2.0;
-
-ZLIB_1.2.0.8 {
-    deflatePrime;
-} ZLIB_1.2.0.2;
-
-ZLIB_1.2.2 {
-    adler32_combine;
-    crc32_combine;
-    deflateSetHeader;
-    inflateGetHeader;
-} ZLIB_1.2.0.8;
-
-ZLIB_1.2.2.3 {
-    deflateTune;
-    gzdirect;
-} ZLIB_1.2.2;
-
-ZLIB_1.2.2.4 {
-    inflatePrime;
-} ZLIB_1.2.2.3;
-
-ZLIB_1.2.3.3 {
-    adler32_combine64;
-    crc32_combine64;
-    gzopen64;
-    gzseek64;
-    gztell64;
-    inflateUndermine;
-} ZLIB_1.2.2.4;
-
-ZLIB_1.2.3.4 {
-    inflateReset2;
-    inflateMark;
-} ZLIB_1.2.3.3;
-
-ZLIB_1.2.3.5 {
-    gzbuffer;
-    gzoffset;
-    gzoffset64;
-    gzclose_r;
-    gzclose_w;
-} ZLIB_1.2.3.4;
-
-ZLIB_1.2.5.1 {
-    deflatePending;
-} ZLIB_1.2.3.5;
-
-ZLIB_1.2.5.2 {
-    deflateResetKeep;
-    gzgetc_;
-    inflateResetKeep;
-} ZLIB_1.2.5.1;
-
-ZLIB_1.2.7.1 {
-    inflateGetDictionary;
-    gzvprintf;
-} ZLIB_1.2.5.2;
-
-ZLIB_1.2.9 {
-    inflateCodesUsed;
-    inflateValidate;
-    uncompress2;
-    gzfread;
-    gzfwrite;
-    deflateGetDictionary;
-    adler32_z;
-    crc32_z;
-} ZLIB_1.2.7.1;
diff --git a/src/png/zlib/zlib.pc.cmakein b/src/png/zlib/zlib.pc.cmakein
deleted file mode 100644
index a5e642938..000000000
--- a/src/png/zlib/zlib.pc.cmakein
+++ /dev/null
@@ -1,13 +0,0 @@
-prefix=@CMAKE_INSTALL_PREFIX@
-exec_prefix=@CMAKE_INSTALL_PREFIX@
-libdir=@INSTALL_LIB_DIR@
-sharedlibdir=@INSTALL_LIB_DIR@
-includedir=@INSTALL_INC_DIR@
-
-Name: zlib
-Description: zlib compression library
-Version: @VERSION@
-
-Requires:
-Libs: -L${libdir} -L${sharedlibdir} -lz
-Cflags: -I${includedir}
diff --git a/src/png/zlib/zlib.pc.in b/src/png/zlib/zlib.pc.in
deleted file mode 100644
index 7e5acf9c7..000000000
--- a/src/png/zlib/zlib.pc.in
+++ /dev/null
@@ -1,13 +0,0 @@
-prefix=@prefix@
-exec_prefix=@exec_prefix@
-libdir=@libdir@
-sharedlibdir=@sharedlibdir@
-includedir=@includedir@
-
-Name: zlib
-Description: zlib compression library
-Version: @VERSION@
-
-Requires:
-Libs: -L${libdir} -L${sharedlibdir} -lz
-Cflags: -I${includedir}
diff --git a/src/png/zlib/zlib2ansi b/src/png/zlib/zlib2ansi
deleted file mode 100644
index 15e3e165f..000000000
--- a/src/png/zlib/zlib2ansi
+++ /dev/null
@@ -1,152 +0,0 @@
-#!/usr/bin/perl
-
-# Transform K&R C function definitions into ANSI equivalent.
-#
-# Author: Paul Marquess
-# Version: 1.0
-# Date: 3 October 2006
-
-# TODO
-#
-# Asumes no function pointer parameters. unless they are typedefed.
-# Assumes no literal strings that look like function definitions
-# Assumes functions start at the beginning of a line
-
-use strict;
-use warnings;
-
-local $/;
-$_ = <>;
-
-my $sp = qr{ \s* (?: /\* .*? \*/ )? \s* }x; # assume no nested comments
-
-my $d1    = qr{ $sp (?: [\w\*\s]+ $sp)* $sp \w+ $sp [\[\]\s]* $sp }x ;
-my $decl  = qr{ $sp (?: \w+ $sp )+ $d1 }xo ;
-my $dList = qr{ $sp $decl (?: $sp , $d1 )* $sp ; $sp }xo ;
-
-
-while (s/^
-            (                  # Start $1
-                (              #   Start $2
-                    .*?        #     Minimal eat content
-                    ( ^ \w [\w\s\*]+ )    #     $3 -- function name
-                    \s*        #     optional whitespace
-                )              # $2 - Matched up to before parameter list
-
-                \( \s*         # Literal "(" + optional whitespace
-                ( [^\)]+ )     # $4 - one or more anythings except ")"
-                \s* \)         # optional whitespace surrounding a Literal ")"
-
-                ( (?: $dList )+ ) # $5
-
-                $sp ^ {        # literal "{" at start of line
-            )                  # Remember to $1
-        //xsom
-      )
-{
-    my $all = $1 ;
-    my $prefix = $2;
-    my $param_list = $4 ;
-    my $params = $5;
-
-    StripComments($params);
-    StripComments($param_list);
-    $param_list =~ s/^\s+//;
-    $param_list =~ s/\s+$//;
-
-    my $i = 0 ;
-    my %pList = map { $_ => $i++ }
-                split /\s*,\s*/, $param_list;
-    my $pMatch = '(\b' . join('|', keys %pList) . '\b)\W*$' ;
-
-    my @params = split /\s*;\s*/, $params;
-    my @outParams = ();
-    foreach my $p (@params)
-    {
-        if ($p =~ /,/)
-        {
-            my @bits = split /\s*,\s*/, $p;
-            my $first = shift @bits;
-            $first =~ s/^\s*//;
-            push @outParams, $first;
-            $first =~ /^(\w+\s*)/;
-            my $type = $1 ;
-            push @outParams, map { $type . $_ } @bits;
-        }
-        else
-        {
-            $p =~ s/^\s+//;
-            push @outParams, $p;
-        }
-    }
-
-
-    my %tmp = map { /$pMatch/;  $_ => $pList{$1}  }
-              @outParams ;
-
-    @outParams = map  { "    $_" }
-                 sort { $tmp{$a} <=> $tmp{$b} }
-                 @outParams ;
-
-    print $prefix ;
-    print "(\n" . join(",\n", @outParams) . ")\n";
-    print "{" ;
-
-}
-
-# Output any trailing code.
-print ;
-exit 0;
-
-
-sub StripComments
-{
-
-  no warnings;
-
-  # Strip C & C++ coments
-  # From the perlfaq
-  $_[0] =~
-
-    s{
-       /\*         ##  Start of /* ... */ comment
-       [^*]*\*+    ##  Non-* followed by 1-or-more *'s
-       (
-         [^/*][^*]*\*+
-       )*          ##  0-or-more things which don't start with /
-                   ##    but do end with '*'
-       /           ##  End of /* ... */ comment
-
-     |         ##     OR  C++ Comment
-       //          ## Start of C++ comment //
-       [^\n]*      ## followed by 0-or-more non end of line characters
-
-     |         ##     OR  various things which aren't comments:
-
-       (
-         "           ##  Start of " ... " string
-         (
-           \\.           ##  Escaped char
-         |               ##    OR
-           [^"\\]        ##  Non "\
-         )*
-         "           ##  End of " ... " string
-
-       |         ##     OR
-
-         '           ##  Start of ' ... ' string
-         (
-           \\.           ##  Escaped char
-         |               ##    OR
-           [^'\\]        ##  Non '\
-         )*
-         '           ##  End of ' ... ' string
-
-       |         ##     OR
-
-         .           ##  Anything other char
-         [^/"'\\]*   ##  Chars which doesn't start a comment, string or escape
-       )
-     }{$2}gxs;
-
-}
diff --git a/src/png/zlib/zutil.c b/src/png/zlib/zutil.c
deleted file mode 100644
index a76c6b0c7..000000000
--- a/src/png/zlib/zutil.c
+++ /dev/null
@@ -1,325 +0,0 @@
-/* zutil.c -- target dependent utility functions for the compression library
- * Copyright (C) 1995-2017 Jean-loup Gailly
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* @(#) $Id$ */
-
-#include "zutil.h"
-#ifndef Z_SOLO
-#  include "gzguts.h"
-#endif
-
-z_const char * const z_errmsg[10] = {
-    (z_const char *)"need dictionary",     /* Z_NEED_DICT       2  */
-    (z_const char *)"stream end",          /* Z_STREAM_END      1  */
-    (z_const char *)"",                    /* Z_OK              0  */
-    (z_const char *)"file error",          /* Z_ERRNO         (-1) */
-    (z_const char *)"stream error",        /* Z_STREAM_ERROR  (-2) */
-    (z_const char *)"data error",          /* Z_DATA_ERROR    (-3) */
-    (z_const char *)"insufficient memory", /* Z_MEM_ERROR     (-4) */
-    (z_const char *)"buffer error",        /* Z_BUF_ERROR     (-5) */
-    (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */
-    (z_const char *)""
-};
-
-
-const char * ZEXPORT zlibVersion()
-{
-    return ZLIB_VERSION;
-}
-
-uLong ZEXPORT zlibCompileFlags()
-{
-    uLong flags;
-
-    flags = 0;
-    switch ((int)(sizeof(uInt))) {
-    case 2:     break;
-    case 4:     flags += 1;     break;
-    case 8:     flags += 2;     break;
-    default:    flags += 3;
-    }
-    switch ((int)(sizeof(uLong))) {
-    case 2:     break;
-    case 4:     flags += 1 << 2;        break;
-    case 8:     flags += 2 << 2;        break;
-    default:    flags += 3 << 2;
-    }
-    switch ((int)(sizeof(voidpf))) {
-    case 2:     break;
-    case 4:     flags += 1 << 4;        break;
-    case 8:     flags += 2 << 4;        break;
-    default:    flags += 3 << 4;
-    }
-    switch ((int)(sizeof(z_off_t))) {
-    case 2:     break;
-    case 4:     flags += 1 << 6;        break;
-    case 8:     flags += 2 << 6;        break;
-    default:    flags += 3 << 6;
-    }
-#ifdef ZLIB_DEBUG
-    flags += 1 << 8;
-#endif
-#if defined(ASMV) || defined(ASMINF)
-    flags += 1 << 9;
-#endif
-#ifdef ZLIB_WINAPI
-    flags += 1 << 10;
-#endif
-#ifdef BUILDFIXED
-    flags += 1 << 12;
-#endif
-#ifdef DYNAMIC_CRC_TABLE
-    flags += 1 << 13;
-#endif
-#ifdef NO_GZCOMPRESS
-    flags += 1L << 16;
-#endif
-#ifdef NO_GZIP
-    flags += 1L << 17;
-#endif
-#ifdef PKZIP_BUG_WORKAROUND
-    flags += 1L << 20;
-#endif
-#ifdef FASTEST
-    flags += 1L << 21;
-#endif
-#if defined(STDC) || defined(Z_HAVE_STDARG_H)
-#  ifdef NO_vsnprintf
-    flags += 1L << 25;
-#    ifdef HAS_vsprintf_void
-    flags += 1L << 26;
-#    endif
-#  else
-#    ifdef HAS_vsnprintf_void
-    flags += 1L << 26;
-#    endif
-#  endif
-#else
-    flags += 1L << 24;
-#  ifdef NO_snprintf
-    flags += 1L << 25;
-#    ifdef HAS_sprintf_void
-    flags += 1L << 26;
-#    endif
-#  else
-#    ifdef HAS_snprintf_void
-    flags += 1L << 26;
-#    endif
-#  endif
-#endif
-    return flags;
-}
-
-#ifdef ZLIB_DEBUG
-#include <stdlib.h>
-#  ifndef verbose
-#    define verbose 0
-#  endif
-int ZLIB_INTERNAL z_verbose = verbose;
-
-void ZLIB_INTERNAL z_error (m)
-    char *m;
-{
-    fprintf(stderr, "%s\n", m);
-    exit(1);
-}
-#endif
-
-/* exported to allow conversion of error code to string for compress() and
- * uncompress()
- */
-const char * ZEXPORT zError(err)
-    int err;
-{
-    return ERR_MSG(err);
-}
-
-#if defined(_WIN32_WCE)
-    /* The Microsoft C Run-Time Library for Windows CE doesn't have
-     * errno.  We define it as a global variable to simplify porting.
-     * Its value is always 0 and should not be used.
-     */
-    int errno = 0;
-#endif
-
-#ifndef HAVE_MEMCPY
-
-void ZLIB_INTERNAL zmemcpy(dest, source, len)
-    Bytef* dest;
-    const Bytef* source;
-    uInt  len;
-{
-    if (len == 0) return;
-    do {
-        *dest++ = *source++; /* ??? to be unrolled */
-    } while (--len != 0);
-}
-
-int ZLIB_INTERNAL zmemcmp(s1, s2, len)
-    const Bytef* s1;
-    const Bytef* s2;
-    uInt  len;
-{
-    uInt j;
-
-    for (j = 0; j < len; j++) {
-        if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
-    }
-    return 0;
-}
-
-void ZLIB_INTERNAL zmemzero(dest, len)
-    Bytef* dest;
-    uInt  len;
-{
-    if (len == 0) return;
-    do {
-        *dest++ = 0;  /* ??? to be unrolled */
-    } while (--len != 0);
-}
-#endif
-
-#ifndef Z_SOLO
-
-#ifdef SYS16BIT
-
-#ifdef __TURBOC__
-/* Turbo C in 16-bit mode */
-
-#  define MY_ZCALLOC
-
-/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
- * and farmalloc(64K) returns a pointer with an offset of 8, so we
- * must fix the pointer. Warning: the pointer must be put back to its
- * original form in order to free it, use zcfree().
- */
-
-#define MAX_PTR 10
-/* 10*64K = 640K */
-
-local int next_ptr = 0;
-
-typedef struct ptr_table_s {
-    voidpf org_ptr;
-    voidpf new_ptr;
-} ptr_table;
-
-local ptr_table table[MAX_PTR];
-/* This table is used to remember the original form of pointers
- * to large buffers (64K). Such pointers are normalized with a zero offset.
- * Since MSDOS is not a preemptive multitasking OS, this table is not
- * protected from concurrent access. This hack doesn't work anyway on
- * a protected system like OS/2. Use Microsoft C instead.
- */
-
-voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
-{
-    voidpf buf;
-    ulg bsize = (ulg)items*size;
-
-    (void)opaque;
-
-    /* If we allocate less than 65520 bytes, we assume that farmalloc
-     * will return a usable pointer which doesn't have to be normalized.
-     */
-    if (bsize < 65520L) {
-        buf = farmalloc(bsize);
-        if (*(ush*)&buf != 0) return buf;
-    } else {
-        buf = farmalloc(bsize + 16L);
-    }
-    if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
-    table[next_ptr].org_ptr = buf;
-
-    /* Normalize the pointer to seg:0 */
-    *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
-    *(ush*)&buf = 0;
-    table[next_ptr++].new_ptr = buf;
-    return buf;
-}
-
-void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
-{
-    int n;
-
-    (void)opaque;
-
-    if (*(ush*)&ptr != 0) { /* object < 64K */
-        farfree(ptr);
-        return;
-    }
-    /* Find the original pointer */
-    for (n = 0; n < next_ptr; n++) {
-        if (ptr != table[n].new_ptr) continue;
-
-        farfree(table[n].org_ptr);
-        while (++n < next_ptr) {
-            table[n-1] = table[n];
-        }
-        next_ptr--;
-        return;
-    }
-    Assert(0, "zcfree: ptr not found");
-}
-
-#endif /* __TURBOC__ */
-
-
-#ifdef M_I86
-/* Microsoft C in 16-bit mode */
-
-#  define MY_ZCALLOC
-
-#if (!defined(_MSC_VER) || (_MSC_VER <= 600))
-#  define _halloc  halloc
-#  define _hfree   hfree
-#endif
-
-voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
-{
-    (void)opaque;
-    return _halloc((long)items, size);
-}
-
-void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
-{
-    (void)opaque;
-    _hfree(ptr);
-}
-
-#endif /* M_I86 */
-
-#endif /* SYS16BIT */
-
-
-#ifndef MY_ZCALLOC /* Any system without a special alloc function */
-
-#ifndef STDC
-extern voidp  malloc OF((uInt size));
-extern voidp  calloc OF((uInt items, uInt size));
-extern void   free   OF((voidpf ptr));
-#endif
-
-voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
-    voidpf opaque;
-    unsigned items;
-    unsigned size;
-{
-    (void)opaque;
-    return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
-                              (voidpf)calloc(items, size);
-}
-
-void ZLIB_INTERNAL zcfree (opaque, ptr)
-    voidpf opaque;
-    voidpf ptr;
-{
-    (void)opaque;
-    free(ptr);
-}
-
-#endif /* MY_ZCALLOC */
-
-#endif /* !Z_SOLO */
diff --git a/src/png/zlib/zutil.h b/src/png/zlib/zutil.h
deleted file mode 100644
index b079ea6a8..000000000
--- a/src/png/zlib/zutil.h
+++ /dev/null
@@ -1,271 +0,0 @@
-/* zutil.h -- internal interface and configuration of the compression library
- * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* WARNING: this file should *not* be used by applications. It is
-   part of the implementation of the compression library and is
-   subject to change. Applications should only use zlib.h.
- */
-
-/* @(#) $Id$ */
-
-#ifndef ZUTIL_H
-#define ZUTIL_H
-
-#ifdef HAVE_HIDDEN
-#  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
-#else
-#  define ZLIB_INTERNAL
-#endif
-
-#include "zlib.h"
-
-#if defined(STDC) && !defined(Z_SOLO)
-#  if !(defined(_WIN32_WCE) && defined(_MSC_VER))
-#    include <stddef.h>
-#  endif
-#  include <string.h>
-#  include <stdlib.h>
-#endif
-
-#ifdef Z_SOLO
-   typedef long ptrdiff_t;  /* guess -- will be caught if guess is wrong */
-#endif
-
-#ifndef local
-#  define local static
-#endif
-/* since "static" is used to mean two completely different things in C, we
-   define "local" for the non-static meaning of "static", for readability
-   (compile with -Dlocal if your debugger can't find static symbols) */
-
-typedef unsigned char  uch;
-typedef uch FAR uchf;
-typedef unsigned short ush;
-typedef ush FAR ushf;
-typedef unsigned long  ulg;
-
-extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
-/* (size given to avoid silly warnings with Visual C++) */
-
-#define ERR_MSG(err) z_errmsg[Z_NEED_DICT-(err)]
-
-#define ERR_RETURN(strm,err) \
-  return (strm->msg = ERR_MSG(err), (err))
-/* To be used only when the state is known to be valid */
-
-        /* common constants */
-
-#ifndef DEF_WBITS
-#  define DEF_WBITS MAX_WBITS
-#endif
-/* default windowBits for decompression. MAX_WBITS is for compression only */
-
-#if MAX_MEM_LEVEL >= 8
-#  define DEF_MEM_LEVEL 8
-#else
-#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
-#endif
-/* default memLevel */
-
-#define STORED_BLOCK 0
-#define STATIC_TREES 1
-#define DYN_TREES    2
-/* The three kinds of block type */
-
-#define MIN_MATCH  3
-#define MAX_MATCH  258
-/* The minimum and maximum match lengths */
-
-#define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */
-
-        /* target dependencies */
-
-#if defined(MSDOS) || (defined(WINDOWS) && !defined(WIN32))
-#  define OS_CODE  0x00
-#  ifndef Z_SOLO
-#    if defined(__TURBOC__) || defined(__BORLANDC__)
-#      if (__STDC__ == 1) && (defined(__LARGE__) || defined(__COMPACT__))
-         /* Allow compilation with ANSI keywords only enabled */
-         void _Cdecl farfree( void *block );
-         void *_Cdecl farmalloc( unsigned long nbytes );
-#      else
-#        include <alloc.h>
-#      endif
-#    else /* MSC or DJGPP */
-#      include <malloc.h>
-#    endif
-#  endif
-#endif
-
-#ifdef AMIGA
-#  define OS_CODE  1
-#endif
-
-#if defined(VAXC) || defined(VMS)
-#  define OS_CODE  2
-#  define F_OPEN(name, mode) \
-     fopen((name), (mode), "mbc=60", "ctx=stm", "rfm=fix", "mrs=512")
-#endif
-
-#ifdef __370__
-#  if __TARGET_LIB__ < 0x20000000
-#    define OS_CODE 4
-#  elif __TARGET_LIB__ < 0x40000000
-#    define OS_CODE 11
-#  else
-#    define OS_CODE 8
-#  endif
-#endif
-
-#if defined(ATARI) || defined(atarist)
-#  define OS_CODE  5
-#endif
-
-#ifdef OS2
-#  define OS_CODE  6
-#  if defined(M_I86) && !defined(Z_SOLO)
-#    include <malloc.h>
-#  endif
-#endif
-
-#if defined(MACOS) || defined(TARGET_OS_MAC)
-#  define OS_CODE  7
-#  ifndef Z_SOLO
-#    if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
-#      include <unix.h> /* for fdopen */
-#    else
-#      ifndef fdopen
-#        define fdopen(fd,mode) NULL /* No fdopen() */
-#      endif
-#    endif
-#  endif
-#endif
-
-#ifdef __acorn
-#  define OS_CODE 13
-#endif
-
-#if defined(WIN32) && !defined(__CYGWIN__)
-#  define OS_CODE  10
-#endif
-
-#ifdef _BEOS_
-#  define OS_CODE  16
-#endif
-
-#ifdef __TOS_OS400__
-#  define OS_CODE 18
-#endif
-
-#ifdef __APPLE__
-#  define OS_CODE 19
-#endif
-
-#if defined(_BEOS_) || defined(RISCOS)
-#  define fdopen(fd,mode) NULL /* No fdopen() */
-#endif
-
-#if (defined(_MSC_VER) && (_MSC_VER > 600)) && !defined __INTERIX
-#  if defined(_WIN32_WCE)
-#    define fdopen(fd,mode) NULL /* No fdopen() */
-#    ifndef _PTRDIFF_T_DEFINED
-       typedef int ptrdiff_t;
-#      define _PTRDIFF_T_DEFINED
-#    endif
-#  else
-#    define fdopen(fd,type)  _fdopen(fd,type)
-#  endif
-#endif
-
-#if defined(__BORLANDC__) && !defined(MSDOS)
-  #pragma warn -8004
-  #pragma warn -8008
-  #pragma warn -8066
-#endif
-
-/* provide prototypes for these when building zlib without LFS */
-#if !defined(_WIN32) && \
-    (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
-    ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
-    ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
-#endif
-
-        /* common defaults */
-
-#ifndef OS_CODE
-#  define OS_CODE  3     /* assume Unix */
-#endif
-
-#ifndef F_OPEN
-#  define F_OPEN(name, mode) fopen((name), (mode))
-#endif
-
-         /* functions */
-
-#if defined(pyr) || defined(Z_SOLO)
-#  define NO_MEMCPY
-#endif
-#if defined(SMALL_MEDIUM) && !defined(_MSC_VER) && !defined(__SC__)
- /* Use our own functions for small and medium model with MSC <= 5.0.
-  * You may have to use the same strategy for Borland C (untested).
-  * The __SC__ check is for Symantec.
-  */
-#  define NO_MEMCPY
-#endif
-#if defined(STDC) && !defined(HAVE_MEMCPY) && !defined(NO_MEMCPY)
-#  define HAVE_MEMCPY
-#endif
-#ifdef HAVE_MEMCPY
-#  ifdef SMALL_MEDIUM /* MSDOS small or medium model */
-#    define zmemcpy _fmemcpy
-#    define zmemcmp _fmemcmp
-#    define zmemzero(dest, len) _fmemset(dest, 0, len)
-#  else
-#    define zmemcpy memcpy
-#    define zmemcmp memcmp
-#    define zmemzero(dest, len) memset(dest, 0, len)
-#  endif
-#else
-   void ZLIB_INTERNAL zmemcpy OF((Bytef* dest, const Bytef* source, uInt len));
-   int ZLIB_INTERNAL zmemcmp OF((const Bytef* s1, const Bytef* s2, uInt len));
-   void ZLIB_INTERNAL zmemzero OF((Bytef* dest, uInt len));
-#endif
-
-/* Diagnostic functions */
-#ifdef ZLIB_DEBUG
-#  include <stdio.h>
-   extern int ZLIB_INTERNAL z_verbose;
-   extern void ZLIB_INTERNAL z_error OF((char *m));
-#  define Assert(cond,msg) {if(!(cond)) z_error(msg);}
-#  define Trace(x) {if (z_verbose>=0) fprintf x ;}
-#  define Tracev(x) {if (z_verbose>0) fprintf x ;}
-#  define Tracevv(x) {if (z_verbose>1) fprintf x ;}
-#  define Tracec(c,x) {if (z_verbose>0 && (c)) fprintf x ;}
-#  define Tracecv(c,x) {if (z_verbose>1 && (c)) fprintf x ;}
-#else
-#  define Assert(cond,msg)
-#  define Trace(x)
-#  define Tracev(x)
-#  define Tracevv(x)
-#  define Tracec(c,x)
-#  define Tracecv(c,x)
-#endif
-
-#ifndef Z_SOLO
-   voidpf ZLIB_INTERNAL zcalloc OF((voidpf opaque, unsigned items,
-                                    unsigned size));
-   void ZLIB_INTERNAL zcfree  OF((voidpf opaque, voidpf ptr));
-#endif
-
-#define ZALLOC(strm, items, size) \
-           (*((strm)->zalloc))((strm)->opaque, (items), (size))
-#define ZFREE(strm, addr)  (*((strm)->zfree))((strm)->opaque, (voidpf)(addr))
-#define TRY_FREE(s, p) {if (p) ZFREE(s, p);}
-
-/* Reverse the bytes in a 32-bit value */
-#define ZSWAP32(q) ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
-                    (((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
-
-#endif /* ZUTIL_H */