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50 files changed, 51841 insertions, 0 deletions

diff --git a/winsup/bz2lib/CHANGES b/winsup/bz2lib/CHANGES
new file mode 100644
index 000000000..ecaf4170e
--- /dev/null
+++ b/winsup/bz2lib/CHANGES
@@ -0,0 +1,167 @@
+
+
+0.9.0
+~~~~~
+First version.
+
+
+0.9.0a
+~~~~~~
+Removed 'ranlib' from Makefile, since most modern Unix-es 
+don't need it, or even know about it.
+
+
+0.9.0b
+~~~~~~
+Fixed a problem with error reporting in bzip2.c.  This does not effect
+the library in any way.  Problem is: versions 0.9.0 and 0.9.0a (of the
+program proper) compress and decompress correctly, but give misleading
+error messages (internal panics) when an I/O error occurs, instead of
+reporting the problem correctly.  This shouldn't give any data loss
+(as far as I can see), but is confusing.
+
+Made the inline declarations disappear for non-GCC compilers.
+
+
+0.9.0c
+~~~~~~
+Fixed some problems in the library pertaining to some boundary cases.
+This makes the library behave more correctly in those situations.  The
+fixes apply only to features (calls and parameters) not used by
+bzip2.c, so the non-fixedness of them in previous versions has no
+effect on reliability of bzip2.c.
+
+In bzlib.c:
+   * made zero-length BZ_FLUSH work correctly in bzCompress().
+   * fixed bzWrite/bzRead to ignore zero-length requests.
+   * fixed bzread to correctly handle read requests after EOF.
+   * wrong parameter order in call to bzDecompressInit in
+     bzBuffToBuffDecompress.  Fixed.
+
+In compress.c:
+   * changed setting of nGroups in sendMTFValues() so as to 
+     do a bit better on small files.  This _does_ effect
+     bzip2.c.
+
+
+0.9.5a
+~~~~~~
+Major change: add a fallback sorting algorithm (blocksort.c)
+to give reasonable behaviour even for very repetitive inputs.
+Nuked --repetitive-best and --repetitive-fast since they are
+no longer useful.
+
+Minor changes: mostly a whole bunch of small changes/
+bugfixes in the driver (bzip2.c).  Changes pertaining to the
+user interface are:
+
+   allow decompression of symlink'd files to stdout
+   decompress/test files even without .bz2 extension
+   give more accurate error messages for I/O errors
+   when compressing/decompressing to stdout, don't catch control-C
+   read flags from BZIP2 and BZIP environment variables
+   decline to break hard links to a file unless forced with -f
+   allow -c flag even with no filenames
+   preserve file ownerships as far as possible
+   make -s -1 give the expected block size (100k)
+   add a flag -q --quiet to suppress nonessential warnings
+   stop decoding flags after --, so files beginning in - can be handled
+   resolved inconsistent naming: bzcat or bz2cat ?
+   bzip2 --help now returns 0
+
+Programming-level changes are:
+
+   fixed syntax error in GET_LL4 for Borland C++ 5.02
+   let bzBuffToBuffDecompress return BZ_DATA_ERROR{_MAGIC}
+   fix overshoot of mode-string end in bzopen_or_bzdopen
+   wrapped bzlib.h in #ifdef __cplusplus ... extern "C" { ... }
+   close file handles under all error conditions
+   added minor mods so it compiles with DJGPP out of the box
+   fixed Makefile so it doesn't give problems with BSD make
+   fix uninitialised memory reads in dlltest.c
+
+0.9.5b
+~~~~~~
+Open stdin/stdout in binary mode for DJGPP.
+
+0.9.5c
+~~~~~~
+Changed BZ_N_OVERSHOOT to be ... + 2 instead of ... + 1.  The + 1
+version could cause the sorted order to be wrong in some extremely
+obscure cases.  Also changed setting of quadrant in blocksort.c.
+
+0.9.5d
+~~~~~~
+The only functional change is to make bzlibVersion() in the library
+return the correct string.  This has no effect whatsoever on the
+functioning of the bzip2 program or library.  Added a couple of casts
+so the library compiles without warnings at level 3 in MS Visual
+Studio 6.0.  Included a Y2K statement in the file Y2K_INFO.  All other
+changes are minor documentation changes.
+
+1.0
+~~~
+Several minor bugfixes and enhancements:
+
+* Large file support.  The library uses 64-bit counters to
+  count the volume of data passing through it.  bzip2.c 
+  is now compiled with -D_FILE_OFFSET_BITS=64 to get large
+  file support from the C library.  -v correctly prints out
+  file sizes greater than 4 gigabytes.  All these changes have
+  been made without assuming a 64-bit platform or a C compiler
+  which supports 64-bit ints, so, except for the C library
+  aspect, they are fully portable.
+
+* Decompression robustness.  The library/program should be
+  robust to any corruption of compressed data, detecting and
+  handling _all_ corruption, instead of merely relying on
+  the CRCs.  What this means is that the program should 
+  never crash, given corrupted data, and the library should
+  always return BZ_DATA_ERROR.
+
+* Fixed an obscure race-condition bug only ever observed on
+  Solaris, in which, if you were very unlucky and issued
+  control-C at exactly the wrong time, both input and output
+  files would be deleted.
+
+* Don't run out of file handles on test/decompression when
+  large numbers of files have invalid magic numbers.
+
+* Avoid library namespace pollution.  Prefix all exported 
+  symbols with BZ2_.
+
+* Minor sorting enhancements from my DCC2000 paper.
+
+* Advance the version number to 1.0, so as to counteract the
+  (false-in-this-case) impression some people have that programs 
+  with version numbers less than 1.0 are in someway, experimental,
+  pre-release versions.
+
+* Create an initial Makefile-libbz2_so to build a shared library.
+  Yes, I know I should really use libtool et al ...
+
+* Make the program exit with 2 instead of 0 when decompression
+  fails due to a bad magic number (ie, an invalid bzip2 header).
+  Also exit with 1 (as the manual claims :-) whenever a diagnostic
+  message would have been printed AND the corresponding operation 
+  is aborted, for example
+     bzip2: Output file xx already exists.
+  When a diagnostic message is printed but the operation is not 
+  aborted, for example
+     bzip2: Can't guess original name for wurble -- using wurble.out
+  then the exit value 0 is returned, unless some other problem is
+  also detected.
+
+  I think it corresponds more closely to what the manual claims now.
+
+
+1.0.1
+~~~~~
+* Modified dlltest.c so it uses the new BZ2_ naming scheme.
+* Modified makefile-msc to fix minor build probs on Win2k.
+* Updated README.COMPILATION.PROBLEMS.
+
+There are no functionality changes or bug fixes relative to version
+1.0.0.  This is just a documentation update + a fix for minor Win32
+build problems.  For almost everyone, upgrading from 1.0.0 to 1.0.1 is
+utterly pointless.  Don't bother.
diff --git a/winsup/bz2lib/ChangeLog b/winsup/bz2lib/ChangeLog
new file mode 100644
index 000000000..44102bbcf
--- /dev/null
+++ b/winsup/bz2lib/ChangeLog
@@ -0,0 +1,6 @@
+Wed Apr 18 15:58:28 2001  Christopher Faylor <cgf@cygnus.com>
+
+	Initial checkin from net sources.
+	Makefile.in: New file.
+	configure.in: New file.
+	configure: New file.
diff --git a/winsup/bz2lib/LICENSE b/winsup/bz2lib/LICENSE
new file mode 100644
index 000000000..88fa6d88a
--- /dev/null
+++ b/winsup/bz2lib/LICENSE
@@ -0,0 +1,39 @@
+
+This program, "bzip2" and associated library "libbzip2", are
+copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+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. 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.
+
+3. Altered source versions must be plainly marked as such, and must
+   not be misrepresented as being the original software.
+
+4. 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.
+
+Julian Seward, Cambridge, UK.
+jseward@acm.org
+bzip2/libbzip2 version 1.0 of 21 March 2000
+
diff --git a/winsup/bz2lib/Makefile b/winsup/bz2lib/Makefile
new file mode 100644
index 000000000..ab17f4979
--- /dev/null
+++ b/winsup/bz2lib/Makefile
@@ -0,0 +1,141 @@
+
+SHELL=/bin/sh
+CC=gcc
+BIGFILES=-D_FILE_OFFSET_BITS=64
+CFLAGS=-Wall -Winline -O2 -fomit-frame-pointer -fno-strength-reduce $(BIGFILES)
+
+OBJS= blocksort.o  \
+      huffman.o    \
+      crctable.o   \
+      randtable.o  \
+      compress.o   \
+      decompress.o \
+      bzlib.o
+
+all: libbz2.a bzip2 bzip2recover test
+
+bzip2: libbz2.a bzip2.o
+	$(CC) $(CFLAGS) -o bzip2 bzip2.o -L. -lbz2
+
+bzip2recover: bzip2recover.o
+	$(CC) $(CFLAGS) -o bzip2recover bzip2recover.o
+
+libbz2.a: $(OBJS)
+	rm -f libbz2.a
+	ar cq libbz2.a $(OBJS)
+	@if ( test -f /usr/bin/ranlib -o -f /bin/ranlib -o \
+		-f /usr/ccs/bin/ranlib ) ; then \
+		echo ranlib libbz2.a ; \
+		ranlib libbz2.a ; \
+	fi
+
+test: bzip2
+	@cat words1
+	./bzip2 -1  < sample1.ref > sample1.rb2
+	./bzip2 -2  < sample2.ref > sample2.rb2
+	./bzip2 -3  < sample3.ref > sample3.rb2
+	./bzip2 -d  < sample1.bz2 > sample1.tst
+	./bzip2 -d  < sample2.bz2 > sample2.tst
+	./bzip2 -ds < sample3.bz2 > sample3.tst
+	cmp sample1.bz2 sample1.rb2 
+	cmp sample2.bz2 sample2.rb2
+	cmp sample3.bz2 sample3.rb2
+	cmp sample1.tst sample1.ref
+	cmp sample2.tst sample2.ref
+	cmp sample3.tst sample3.ref
+	@cat words3
+
+PREFIX=/usr
+
+install: bzip2 bzip2recover
+	if ( test ! -d $(PREFIX)/bin ) ; then mkdir $(PREFIX)/bin ; fi
+	if ( test ! -d $(PREFIX)/lib ) ; then mkdir $(PREFIX)/lib ; fi
+	if ( test ! -d $(PREFIX)/man ) ; then mkdir $(PREFIX)/man ; fi
+	if ( test ! -d $(PREFIX)/man/man1 ) ; then mkdir $(PREFIX)/man/man1 ; fi
+	if ( test ! -d $(PREFIX)/include ) ; then mkdir $(PREFIX)/include ; fi
+	cp -f bzip2 $(PREFIX)/bin/bzip2
+	cp -f bzip2 $(PREFIX)/bin/bunzip2
+	cp -f bzip2 $(PREFIX)/bin/bzcat
+	cp -f bzip2recover $(PREFIX)/bin/bzip2recover
+	chmod a+x $(PREFIX)/bin/bzip2
+	chmod a+x $(PREFIX)/bin/bunzip2
+	chmod a+x $(PREFIX)/bin/bzcat
+	chmod a+x $(PREFIX)/bin/bzip2recover
+	cp -f bzip2.1 $(PREFIX)/man/man1
+	chmod a+r $(PREFIX)/man/man1/bzip2.1
+	cp -f bzlib.h $(PREFIX)/include
+	chmod a+r $(PREFIX)/include/bzlib.h
+	cp -f libbz2.a $(PREFIX)/lib
+	chmod a+r $(PREFIX)/lib/libbz2.a
+
+clean: 
+	rm -f *.o libbz2.a bzip2 bzip2recover \
+	sample1.rb2 sample2.rb2 sample3.rb2 \
+	sample1.tst sample2.tst sample3.tst
+
+blocksort.o: blocksort.c
+	@cat words0
+	$(CC) $(CFLAGS) -c blocksort.c
+huffman.o: huffman.c
+	$(CC) $(CFLAGS) -c huffman.c
+crctable.o: crctable.c
+	$(CC) $(CFLAGS) -c crctable.c
+randtable.o: randtable.c
+	$(CC) $(CFLAGS) -c randtable.c
+compress.o: compress.c
+	$(CC) $(CFLAGS) -c compress.c
+decompress.o: decompress.c
+	$(CC) $(CFLAGS) -c decompress.c
+bzlib.o: bzlib.c
+	$(CC) $(CFLAGS) -c bzlib.c
+bzip2.o: bzip2.c
+	$(CC) $(CFLAGS) -c bzip2.c
+bzip2recover.o: bzip2recover.c
+	$(CC) $(CFLAGS) -c bzip2recover.c
+
+DISTNAME=bzip2-1.0.1
+tarfile:
+	rm -f $(DISTNAME)
+	ln -sf . $(DISTNAME)
+	tar cvf $(DISTNAME).tar \
+	   $(DISTNAME)/blocksort.c \
+	   $(DISTNAME)/huffman.c \
+	   $(DISTNAME)/crctable.c \
+	   $(DISTNAME)/randtable.c \
+	   $(DISTNAME)/compress.c \
+	   $(DISTNAME)/decompress.c \
+	   $(DISTNAME)/bzlib.c \
+	   $(DISTNAME)/bzip2.c \
+	   $(DISTNAME)/bzip2recover.c \
+	   $(DISTNAME)/bzlib.h \
+	   $(DISTNAME)/bzlib_private.h \
+	   $(DISTNAME)/Makefile \
+	   $(DISTNAME)/manual.texi \
+	   $(DISTNAME)/manual.ps \
+	   $(DISTNAME)/LICENSE \
+	   $(DISTNAME)/bzip2.1 \
+	   $(DISTNAME)/bzip2.1.preformatted \
+	   $(DISTNAME)/bzip2.txt \
+	   $(DISTNAME)/words0 \
+	   $(DISTNAME)/words1 \
+	   $(DISTNAME)/words2 \
+	   $(DISTNAME)/words3 \
+	   $(DISTNAME)/sample1.ref \
+	   $(DISTNAME)/sample2.ref \
+	   $(DISTNAME)/sample3.ref \
+	   $(DISTNAME)/sample1.bz2 \
+	   $(DISTNAME)/sample2.bz2 \
+	   $(DISTNAME)/sample3.bz2 \
+	   $(DISTNAME)/dlltest.c \
+	   $(DISTNAME)/*.html \
+	   $(DISTNAME)/README \
+	   $(DISTNAME)/README.COMPILATION.PROBLEMS \
+	   $(DISTNAME)/CHANGES \
+	   $(DISTNAME)/libbz2.def \
+	   $(DISTNAME)/libbz2.dsp \
+	   $(DISTNAME)/dlltest.dsp \
+	   $(DISTNAME)/makefile.msc \
+	   $(DISTNAME)/Y2K_INFO \
+	   $(DISTNAME)/unzcrash.c \
+	   $(DISTNAME)/spewG.c \
+	   $(DISTNAME)/Makefile-libbz2_so
diff --git a/winsup/bz2lib/Makefile-libbz2_so b/winsup/bz2lib/Makefile-libbz2_so
new file mode 100644
index 000000000..a347c50e9
--- /dev/null
+++ b/winsup/bz2lib/Makefile-libbz2_so
@@ -0,0 +1,43 @@
+
+# This Makefile builds a shared version of the library, 
+# libbz2.so.1.0.1, with soname libbz2.so.1.0,
+# at least on x86-Linux (RedHat 5.2), 
+# with gcc-2.7.2.3.  Please see the README file for some 
+# important info about building the library like this.
+
+SHELL=/bin/sh
+CC=gcc
+BIGFILES=-D_FILE_OFFSET_BITS=64
+CFLAGS=-fpic -fPIC -Wall -Winline -O2 -fomit-frame-pointer -fno-strength-reduce $(BIGFILES)
+
+OBJS= blocksort.o  \
+      huffman.o    \
+      crctable.o   \
+      randtable.o  \
+      compress.o   \
+      decompress.o \
+      bzlib.o
+
+all: $(OBJS)
+	$(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 -o libbz2.so.1.0.1 $(OBJS)
+	$(CC) $(CFLAGS) -o bzip2-shared bzip2.c libbz2.so.1.0.1
+	rm -f libbz2.so.1.0
+	ln -s libbz2.so.1.0.1 libbz2.so.1.0
+
+clean: 
+	rm -f $(OBJS) bzip2.o libbz2.so.1.0.1 libbz2.so.1.0 bzip2-shared
+
+blocksort.o: blocksort.c
+	$(CC) $(CFLAGS) -c blocksort.c
+huffman.o: huffman.c
+	$(CC) $(CFLAGS) -c huffman.c
+crctable.o: crctable.c
+	$(CC) $(CFLAGS) -c crctable.c
+randtable.o: randtable.c
+	$(CC) $(CFLAGS) -c randtable.c
+compress.o: compress.c
+	$(CC) $(CFLAGS) -c compress.c
+decompress.o: decompress.c
+	$(CC) $(CFLAGS) -c decompress.c
+bzlib.o: bzlib.c
+	$(CC) $(CFLAGS) -c bzlib.c
diff --git a/winsup/bz2lib/Makefile.in b/winsup/bz2lib/Makefile.in
new file mode 100644
index 000000000..8494a9f67
--- /dev/null
+++ b/winsup/bz2lib/Makefile.in
@@ -0,0 +1,118 @@
+# Copyright (c) 2000, Red Hat, Inc.
+#
+#     This program is free software; you can redistribute it and/or modify
+#     it under the terms of the GNU General Public License as published by
+#     the Free Software Foundation; either version 2 of the License, or
+#     (at your option) any later version.
+#
+#     A copy of the GNU General Public License can be found at
+#     http://www.gnu.org/
+#
+# Written by Christopher Faylor <cgf@redhat.com>
+#
+# Makefile for Cygwin installer
+
+SHELL :=@SHELL@
+
+srcdir:=@srcdir@
+VPATH:=@srcdir@
+prefix:=@prefix@
+exec_prefix:=@exec_prefix@
+
+bindir:=@bindir@
+etcdir:=$(exec_prefix)/etc
+
+program_transform_name :=@program_transform_name@
+
+INSTALL:=@INSTALL@
+INSTALL_PROGRAM:=@INSTALL_PROGRAM@
+INSTALL_DATA:=@INSTALL_DATA@
+
+EXEEXT:=@EXEEXT@
+EXEEXT_FOR_BUILD :=@EXEEXT_FOR_BUILD@
+
+CC:=@CC@
+CC_FOR_TARGET:=$(CC)
+CXX:=@CXX@
+
+CFLAGS:=@CFLAGS@ -nostdinc
+CXXFLAGS:=@CXXFLAGS@ -fno-exceptions -fno-rtti
+CXX:=@CXX@
+
+WINDRES:=@WINDRES@
+OBJCOPY:=@OBJCOPY@
+AR:=@AR@
+RANLIB:=@RANLIB@
+
+include $(srcdir)/../Makefile.common
+
+MINGW_INCLUDES:=-I. -I$(srcdir) -I$(mingw_source)/include -I$(w32api_include) -I$(updir)/bz2lib
+
+MINGW_CXXFLAGS:=-MMD $(CXXFLAGS) -mno-cygwin $(MINGW_INCLUDES) -mwindows
+MINGW_CFLAGS:=-MMD $(CFLAGS) -mno-cygwin $(MINGW_INCLUDES) -mwindows
+
+ZLIB:=zlib/libzcygw.a
+BZ2LIB:=$(bupdir)/bz2lib/libbz2.a
+libmingw32.a:=$(mingw_build)/libmingw32.a
+libuser32:=$(w32api_lib)/libuser32.a
+libkernel32:=$(w32api_lib)/libkernel32.a
+
+ALL_DEP_LDLIBS:=$(ZLIB) $(BZ2LIB) $(w32api_lib)/libole32.a $(w32api_lib)/libwsock32.a \
+		$(w32api_lib)/libnetapi32.a $(w32api_lib)/libadvapi32.a \
+		$(w32api_lib)/libuuid.a $(libkernel32) $(w32api_lib)/libuser32.a \
+		$(libmingw32)
+
+ALL_LDLIBS:=${patsubst $(mingw_build)/lib%.a,-l%,\
+	      ${patsubst $(w32api_lib)/lib%.a,-l%,\
+		${filter-out $(libmingw32),\
+		  ${filter-out $(libuser32),\
+		    ${filter-out $(libkernel32), $(ALL_DEP_LDLIBS)}}}}}
+
+ALL_LDFLAGS:=${filter-out -I%, \
+	       ${filter-out -W%, \
+		-B$(w32api_lib)/ -B${mingw_build}/ $(MINGW_CFLAGS) $(LDFLAGS)}}
+
+LIBS:=libbz2.a
+
+OBJS:=blocksort.o bzlib.o compress.o decompress.o huffman.o crctable.o randtable.o
+
+.SUFFIXES:
+.NOEXPORT:
+
+.PHONY: all install clean realclean
+
+all: Makefile $(LIBS)
+
+$(LIBS): $(OBJS)
+	$(AR) cru $@ $?
+	$(RANLIB) $@
+
+clean:
+	rm -f *.o *.rc *.a
+
+realclean: clean
+	rm -f  Makefile config.cache
+
+install: all
+: Nothing to install
+
+%.o: %.c
+ifdef VERBOSE
+	$(CC) $(MINGW_CFLAGS) -c -o $@ $<
+else
+	@echo $(CC) -c $(CFLAGS) ... $(<F)
+	@$(CC) $(MINGW_CFLAGS) -c -o $@ $<
+endif
+
+%.o: %.cc
+ifdef VERBOSE
+	$(CXX) $(MINGW_CXXFLAGS) -c -o $@ $<
+else
+	@echo $(CXX) -c $(CXXFLAGS) ... $(<F)
+	@$(CXX) $(MINGW_CXXFLAGS) -c -o $@ $<
+endif
+
+D=$(wildcard *.d)
+ifneq ($D,)
+include $D
+endif
diff --git a/winsup/bz2lib/README b/winsup/bz2lib/README
new file mode 100644
index 000000000..22945a256
--- /dev/null
+++ b/winsup/bz2lib/README
@@ -0,0 +1,166 @@
+
+This is the README for bzip2, a block-sorting file compressor, version
+1.0.  This version is fully compatible with the previous public
+releases, bzip2-0.1pl2, bzip2-0.9.0 and bzip2-0.9.5.
+
+bzip2-1.0 is distributed under a BSD-style license.  For details,
+see the file LICENSE.
+
+Complete documentation is available in Postscript form (manual.ps) or
+html (manual_toc.html).  A plain-text version of the manual page is
+available as bzip2.txt.  A statement about Y2K issues is now included
+in the file Y2K_INFO.
+
+
+HOW TO BUILD -- UNIX
+
+Type `make'.  This builds the library libbz2.a and then the
+programs bzip2 and bzip2recover.  Six self-tests are run.
+If the self-tests complete ok, carry on to installation:
+
+To install in /usr/bin, /usr/lib, /usr/man and /usr/include, type
+   make install
+To install somewhere else, eg, /xxx/yyy/{bin,lib,man,include}, type 
+   make install PREFIX=/xxx/yyy
+If you are (justifiably) paranoid and want to see what 'make install'
+is going to do, you can first do
+   make -n install                      or
+   make -n install PREFIX=/xxx/yyy      respectively.
+The -n instructs make to show the commands it would execute, but
+not actually execute them.
+
+
+HOW TO BUILD -- UNIX, shared library libbz2.so.
+
+Do 'make -f Makefile-libbz2_so'.  This Makefile seems to work for
+Linux-ELF (RedHat 5.2 on an x86 box), with gcc.  I make no claims
+that it works for any other platform, though I suspect it probably
+will work for most platforms employing both ELF and gcc.
+
+bzip2-shared, a client of the shared library, is also build, but
+not self-tested.  So I suggest you also build using the normal
+Makefile, since that conducts a self-test.
+
+Important note for people upgrading .so's from 0.9.0/0.9.5 to
+version 1.0.  All the functions in the library have been renamed,
+from (eg) bzCompress to BZ2_bzCompress, to avoid namespace pollution.
+Unfortunately this means that the libbz2.so created by
+Makefile-libbz2_so will not work with any program which used an
+older version of the library.  Sorry.  I do encourage library
+clients to make the effort to upgrade to use version 1.0, since
+it is both faster and more robust than previous versions.
+
+
+HOW TO BUILD -- Windows 95, NT, DOS, Mac, etc.
+
+It's difficult for me to support compilation on all these platforms.
+My approach is to collect binaries for these platforms, and put them
+on the master web page (http://sourceware.cygnus.com/bzip2).  Look
+there.  However (FWIW), bzip2-1.0 is very standard ANSI C and should
+compile unmodified with MS Visual C.  For Win32, there is one
+important caveat: in bzip2.c, you must set BZ_UNIX to 0 and
+BZ_LCCWIN32 to 1 before building.  If you have difficulties building,
+you might want to read README.COMPILATION.PROBLEMS.
+
+
+VALIDATION
+
+Correct operation, in the sense that a compressed file can always be
+decompressed to reproduce the original, is obviously of paramount
+importance.  To validate bzip2, I used a modified version of Mark
+Nelson's churn program.  Churn is an automated test driver which
+recursively traverses a directory structure, using bzip2 to compress
+and then decompress each file it encounters, and checking that the
+decompressed data is the same as the original.  There are more details
+in Section 4 of the user guide.
+
+
+
+Please read and be aware of the following:
+
+WARNING:
+
+   This program (attempts to) compress data by performing several
+   non-trivial transformations on it.  Unless you are 100% familiar
+   with *all* the algorithms contained herein, and with the
+   consequences of modifying them, you should NOT meddle with the
+   compression or decompression machinery.  Incorrect changes can and
+   very likely *will* lead to disastrous loss of data.
+
+
+DISCLAIMER:
+
+   I TAKE NO RESPONSIBILITY FOR ANY LOSS OF DATA ARISING FROM THE
+   USE OF THIS PROGRAM, HOWSOEVER CAUSED.
+
+   Every compression of a file implies an assumption that the
+   compressed file can be decompressed to reproduce the original.
+   Great efforts in design, coding and testing have been made to
+   ensure that this program works correctly.  However, the complexity
+   of the algorithms, and, in particular, the presence of various
+   special cases in the code which occur with very low but non-zero
+   probability make it impossible to rule out the possibility of bugs
+   remaining in the program.  DO NOT COMPRESS ANY DATA WITH THIS
+   PROGRAM UNLESS YOU ARE PREPARED TO ACCEPT THE POSSIBILITY, HOWEVER
+   SMALL, THAT THE DATA WILL NOT BE RECOVERABLE.
+
+   That is not to say this program is inherently unreliable.  Indeed,
+   I very much hope the opposite is true.  bzip2 has been carefully
+   constructed and extensively tested.
+
+
+PATENTS:
+
+   To the best of my knowledge, bzip2 does not use any patented
+   algorithms.  However, I do not have the resources available to
+   carry out a full patent search.  Therefore I cannot give any
+   guarantee of the above statement.
+
+End of legalities.
+
+
+WHAT'S NEW IN 0.9.0 (as compared to 0.1pl2) ?
+
+   * Approx 10% faster compression, 30% faster decompression
+   * -t (test mode) is a lot quicker
+   * Can decompress concatenated compressed files
+   * Programming interface, so programs can directly read/write .bz2 files
+   * Less restrictive (BSD-style) licensing
+   * Flag handling more compatible with GNU gzip
+   * Much more documentation, i.e., a proper user manual
+   * Hopefully, improved portability (at least of the library)
+
+WHAT'S NEW IN 0.9.5 ?
+
+   * Compression speed is much less sensitive to the input
+     data than in previous versions.  Specifically, the very
+     slow performance caused by repetitive data is fixed.
+   * Many small improvements in file and flag handling.
+   * A Y2K statement.
+
+WHAT'S NEW IN 1.0
+
+   See the CHANGES file.
+
+I hope you find bzip2 useful.  Feel free to contact me at
+   jseward@acm.org
+if you have any suggestions or queries.  Many people mailed me with
+comments, suggestions and patches after the releases of bzip-0.15,
+bzip-0.21, bzip2-0.1pl2 and bzip2-0.9.0, and the changes in bzip2 are
+largely a result of this feedback.  I thank you for your comments.
+
+At least for the time being, bzip2's "home" is (or can be reached via)
+http://www.muraroa.demon.co.uk.
+
+Julian Seward
+jseward@acm.org
+
+Cambridge, UK
+18   July 1996 (version 0.15)
+25 August 1996 (version 0.21)
+ 7 August 1997 (bzip2, version 0.1)
+29 August 1997 (bzip2, version 0.1pl2)
+23 August 1998 (bzip2, version 0.9.0)
+ 8   June 1999 (bzip2, version 0.9.5)
+ 4   Sept 1999 (bzip2, version 0.9.5d)
+ 5    May 2000 (bzip2, version 1.0pre8)
diff --git a/winsup/bz2lib/README.COMPILATION.PROBLEMS b/winsup/bz2lib/README.COMPILATION.PROBLEMS
new file mode 100644
index 000000000..d621ad597
--- /dev/null
+++ b/winsup/bz2lib/README.COMPILATION.PROBLEMS
@@ -0,0 +1,130 @@
+
+bzip2-1.0 should compile without problems on the vast majority of
+platforms.  Using the supplied Makefile, I've built and tested it
+myself for x86-linux, sparc-solaris, alpha-linux, x86-cygwin32 and
+alpha-tru64unix.  With makefile.msc, Visual C++ 6.0 and nmake, you can
+build a native Win32 version too.  Large file support seems to work
+correctly on at least alpha-tru64unix and x86-cygwin32 (on Windows
+2000).
+
+When I say "large file" I mean a file of size 2,147,483,648 (2^31)
+bytes or above.  Many older OSs can't handle files above this size,
+but many newer ones can.  Large files are pretty huge -- most files
+you'll encounter are not Large Files.
+
+Earlier versions of bzip2 (0.1, 0.9.0, 0.9.5) compiled on a wide
+variety of platforms without difficulty, and I hope this version will
+continue in that tradition.  However, in order to support large files,
+I've had to include the define -D_FILE_OFFSET_BITS=64 in the Makefile.
+This can cause problems.
+
+The technique of adding -D_FILE_OFFSET_BITS=64 to get large file
+support is, as far as I know, the Recommended Way to get correct large
+file support.  For more details, see the Large File Support
+Specification, published by the Large File Summit, at
+   http://www.sas.com/standard/large.file/
+
+As a general comment, if you get compilation errors which you think
+are related to large file support, try removing the above define from
+the Makefile, ie, delete the line
+   BIGFILES=-D_FILE_OFFSET_BITS=64 
+from the Makefile, and do 'make clean ; make'.  This will give you a
+version of bzip2 without large file support, which, for most
+applications, is probably not a problem.  
+
+Alternatively, try some of the platform-specific hints listed below.
+
+You can use the spewG.c program to generate huge files to test bzip2's
+large file support, if you are feeling paranoid.  Be aware though that
+any compilation problems which affect bzip2 will also affect spewG.c,
+alas.
+
+
+Known problems as of 1.0pre8:
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+* HP/UX 10.20 and 11.00, using gcc (2.7.2.3 and 2.95.2):  A large
+  number of warnings appear, including the following:
+
+     /usr/include/sys/resource.h: In function `getrlimit':
+     /usr/include/sys/resource.h:168: 
+        warning: implicit declaration of function `__getrlimit64'
+     /usr/include/sys/resource.h: In function `setrlimit':
+     /usr/include/sys/resource.h:170: 
+        warning: implicit declaration of function `__setrlimit64'
+
+  This would appear to be a problem with large file support, header
+  files and gcc.  gcc may or may not give up at this point.  If it
+  fails, you might be able to improve matters by adding 
+     -D__STDC_EXT__=1
+  to the BIGFILES variable in the Makefile (ie, change its definition
+  to
+     BIGFILES=-D_FILE_OFFSET_BITS=64 -D__STDC_EXT__=1
+
+  Even if gcc does produce a binary which appears to work (ie passes
+  its self-tests), you might want to test it to see if it works properly
+  on large files.
+
+
+* HP/UX 10.20 and 11.00, using HP's cc compiler.
+
+  No specific problems for this combination, except that you'll need to
+  specify the -Ae flag, and zap the gcc-specific stuff
+  -Wall -Winline -O2 -fomit-frame-pointer -fno-strength-reduce.
+  You should retain -D_FILE_OFFSET_BITS=64 in order to get large
+  file support -- which is reported to work ok for this HP/UX + cc
+  combination.
+
+
+* SunOS 4.1.X.
+
+  Amazingly, there are still people out there using this venerable old
+  banger.  I shouldn't be too rude -- I started life on SunOS, and
+  it was a pretty darn good OS, way back then.  Anyway:
+
+     SunOS doesn't seem to have strerror(), so you'll have to use
+     perror(), perhaps by doing adding this (warning: UNTESTED CODE):
+
+     char* strerror ( int errnum )
+     {
+        if (errnum < 0 || errnum >= sys_nerr)
+           return "Unknown error"; 
+        else
+           return sys_errlist[errnum];
+     }
+
+   Or you could comment out the relevant calls to strerror; they're
+   not mission-critical.  Or you could upgrade to Solaris.  Ha ha ha!
+   (what??  you think I've got Bad Attitude?) 
+
+
+* Making a shared library on Solaris.  (Not really a compilation
+  problem, but many people ask ...)  
+
+  Firstly, if you have Solaris 8, either you have libbz2.so already
+  on your system, or you can install it from the Solaris CD.  
+
+  Secondly, be aware that there are potential naming conflicts
+  between the .so file supplied with Solaris 8, and the .so file
+  which Makefile-libbz2_so will make.  Makefile-libbz2_so creates
+  a .so which has the names which I intend to be "official" as
+  of version 1.0.0 and onwards.  Unfortunately, the .so in
+  Solaris 8 appeared before I decided on the final names, so
+  the two libraries are incompatible.  We have since communicated
+  and I hope that the problems will have been solved in the next
+  version of Solaris, whenever that might appear.
+
+  All that said: you might be able to get somewhere
+  by finding the line in Makefile-libbz2_so which says
+
+  $(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 -o libbz2.so.1.0.1 $(OBJS)
+
+  and replacing with 
+
+  ($CC) -G -shared -o libbz2.so.1.0.1 -h libbz2.so.1.0 $(OBJS)
+  
+  If gcc objects to the combination -fpic -fPIC, get rid of
+  the second one, leaving just "-fpic".
+
+
+That's the end of the currently known compilation problems.
diff --git a/winsup/bz2lib/Y2K_INFO b/winsup/bz2lib/Y2K_INFO
new file mode 100644
index 000000000..55fd56a2e
--- /dev/null
+++ b/winsup/bz2lib/Y2K_INFO
@@ -0,0 +1,34 @@
+
+Y2K status of bzip2 and libbzip2, versions 0.1, 0.9.0 and 0.9.5
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Informally speaking:
+   bzip2 is a compression program built on top of libbzip2, 
+   a library which does the real work of compression and 
+   decompression.  As far as I am aware, libbzip2 does not have 
+   any date-related code at all.
+
+   bzip2 itself copies dates from source to destination files 
+   when compressing or decompressing, using the 'stat' and 'utime' 
+   UNIX system calls.  It doesn't examine, manipulate or store the 
+   dates in any way.  So as far as I can see, there shouldn't be any 
+   problem with bzip2 providing 'stat' and 'utime' work correctly 
+   on your system.
+
+   On non-unix platforms (those for which BZ_UNIX in bzip2.c is
+   not set to 1), bzip2 doesn't even do the date copying.
+
+   Overall, informally speaking, I don't think bzip2 or libbzip2 
+   have a Y2K problem.
+
+Formally speaking:
+   I am not prepared to offer you any assurance whatsoever 
+   regarding Y2K issues in my software.  You alone assume the 
+   entire risk of using the software.  The disclaimer of liability 
+   in the LICENSE file in the bzip2 source distribution continues 
+   to apply on this issue as with every other issue pertaining 
+   to the software.
+
+Julian Seward
+Cambridge, UK
+25 August 1999
diff --git a/winsup/bz2lib/aclocal.m4 b/winsup/bz2lib/aclocal.m4
new file mode 100644
index 000000000..f5379a5be
--- /dev/null
+++ b/winsup/bz2lib/aclocal.m4
@@ -0,0 +1,137 @@
+dnl aclocal.m4 generated automatically by aclocal 1.4
+
+dnl Copyright (C) 1994, 1995-8, 1999 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+dnl even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+dnl PARTICULAR PURPOSE.
+
+# Do all the work for Automake.  This macro actually does too much --
+# some checks are only needed if your package does certain things.
+# But this isn't really a big deal.
+
+# serial 1
+
+dnl Usage:
+dnl AM_INIT_AUTOMAKE(package,version, [no-define])
+
+AC_DEFUN(AM_INIT_AUTOMAKE,
+[AC_REQUIRE([AC_PROG_INSTALL])
+PACKAGE=[$1]
+AC_SUBST(PACKAGE)
+VERSION=[$2]
+AC_SUBST(VERSION)
+dnl test to see if srcdir already configured
+if test "`cd $srcdir && pwd`" != "`pwd`" && test -f $srcdir/config.status; then
+  AC_MSG_ERROR([source directory already configured; run "make distclean" there first])
+fi
+ifelse([$3],,
+AC_DEFINE_UNQUOTED(PACKAGE, "$PACKAGE", [Name of package])
+AC_DEFINE_UNQUOTED(VERSION, "$VERSION", [Version number of package]))
+AC_REQUIRE([AM_SANITY_CHECK])
+AC_REQUIRE([AC_ARG_PROGRAM])
+dnl FIXME This is truly gross.
+missing_dir=`cd $ac_aux_dir && pwd`
+AM_MISSING_PROG(ACLOCAL, aclocal, $missing_dir)
+AM_MISSING_PROG(AUTOCONF, autoconf, $missing_dir)
+AM_MISSING_PROG(AUTOMAKE, automake, $missing_dir)
+AM_MISSING_PROG(AUTOHEADER, autoheader, $missing_dir)
+AM_MISSING_PROG(MAKEINFO, makeinfo, $missing_dir)
+AC_REQUIRE([AC_PROG_MAKE_SET])])
+
+#
+# Check to make sure that the build environment is sane.
+#
+
+AC_DEFUN(AM_SANITY_CHECK,
+[AC_MSG_CHECKING([whether build environment is sane])
+# Just in case
+sleep 1
+echo timestamp > conftestfile
+# Do `set' in a subshell so we don't clobber the current shell's
+# arguments.  Must try -L first in case configure is actually a
+# symlink; some systems play weird games with the mod time of symlinks
+# (eg FreeBSD returns the mod time of the symlink's containing
+# directory).
+if (
+   set X `ls -Lt $srcdir/configure conftestfile 2> /dev/null`
+   if test "[$]*" = "X"; then
+      # -L didn't work.
+      set X `ls -t $srcdir/configure conftestfile`
+   fi
+   if test "[$]*" != "X $srcdir/configure conftestfile" \
+      && test "[$]*" != "X conftestfile $srcdir/configure"; then
+
+      # If neither matched, then we have a broken ls.  This can happen
+      # if, for instance, CONFIG_SHELL is bash and it inherits a
+      # broken ls alias from the environment.  This has actually
+      # happened.  Such a system could not be considered "sane".
+      AC_MSG_ERROR([ls -t appears to fail.  Make sure there is not a broken
+alias in your environment])
+   fi
+
+   test "[$]2" = conftestfile
+   )
+then
+   # Ok.
+   :
+else
+   AC_MSG_ERROR([newly created file is older than distributed files!
+Check your system clock])
+fi
+rm -f conftest*
+AC_MSG_RESULT(yes)])
+
+dnl AM_MISSING_PROG(NAME, PROGRAM, DIRECTORY)
+dnl The program must properly implement --version.
+AC_DEFUN(AM_MISSING_PROG,
+[AC_MSG_CHECKING(for working $2)
+# Run test in a subshell; some versions of sh will print an error if
+# an executable is not found, even if stderr is redirected.
+# Redirect stdin to placate older versions of autoconf.  Sigh.
+if ($2 --version) < /dev/null > /dev/null 2>&1; then
+   $1=$2
+   AC_MSG_RESULT(found)
+else
+   $1="$3/missing $2"
+   AC_MSG_RESULT(missing)
+fi
+AC_SUBST($1)])
+
+# Add --enable-maintainer-mode option to configure.
+# From Jim Meyering
+
+# serial 1
+
+AC_DEFUN(AM_MAINTAINER_MODE,
+[AC_MSG_CHECKING([whether to enable maintainer-specific portions of Makefiles])
+  dnl maintainer-mode is disabled by default
+  AC_ARG_ENABLE(maintainer-mode,
+[  --enable-maintainer-mode enable make rules and dependencies not useful
+                          (and sometimes confusing) to the casual installer],
+      USE_MAINTAINER_MODE=$enableval,
+      USE_MAINTAINER_MODE=no)
+  AC_MSG_RESULT($USE_MAINTAINER_MODE)
+  AM_CONDITIONAL(MAINTAINER_MODE, test $USE_MAINTAINER_MODE = yes)
+  MAINT=$MAINTAINER_MODE_TRUE
+  AC_SUBST(MAINT)dnl
+]
+)
+
+# Define a conditional.
+
+AC_DEFUN(AM_CONDITIONAL,
+[AC_SUBST($1_TRUE)
+AC_SUBST($1_FALSE)
+if $2; then
+  $1_TRUE=
+  $1_FALSE='#'
+else
+  $1_TRUE='#'
+  $1_FALSE=
+fi])
+
diff --git a/winsup/bz2lib/blocksort.c b/winsup/bz2lib/blocksort.c
new file mode 100644
index 000000000..ec426725b
--- /dev/null
+++ b/winsup/bz2lib/blocksort.c
@@ -0,0 +1,1134 @@
+
+/*-------------------------------------------------------------*/
+/*--- Block sorting machinery                               ---*/
+/*---                                           blocksort.c ---*/
+/*-------------------------------------------------------------*/
+
+/*--
+  This file is a part of bzip2 and/or libbzip2, a program and
+  library for lossless, block-sorting data compression.
+
+  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+  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. 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.
+
+  3. Altered source versions must be plainly marked as such, and must
+     not be misrepresented as being the original software.
+
+  4. 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.
+
+  Julian Seward, Cambridge, UK.
+  jseward@acm.org
+  bzip2/libbzip2 version 1.0 of 21 March 2000
+
+  This program is based on (at least) the work of:
+     Mike Burrows
+     David Wheeler
+     Peter Fenwick
+     Alistair Moffat
+     Radford Neal
+     Ian H. Witten
+     Robert Sedgewick
+     Jon L. Bentley
+
+  For more information on these sources, see the manual.
+
+  To get some idea how the block sorting algorithms in this file 
+  work, read my paper 
+     On the Performance of BWT Sorting Algorithms
+  in Proceedings of the IEEE Data Compression Conference 2000,
+  Snowbird, Utah, USA, 27-30 March 2000.  The main sort in this
+  file implements the algorithm called  cache  in the paper.
+--*/
+
+
+#include "bzlib_private.h"
+
+/*---------------------------------------------*/
+/*--- Fallback O(N log(N)^2) sorting        ---*/
+/*--- algorithm, for repetitive blocks      ---*/
+/*---------------------------------------------*/
+
+/*---------------------------------------------*/
+static 
+__inline__
+void fallbackSimpleSort ( UInt32* fmap, 
+                          UInt32* eclass, 
+                          Int32   lo, 
+                          Int32   hi )
+{
+   Int32 i, j, tmp;
+   UInt32 ec_tmp;
+
+   if (lo == hi) return;
+
+   if (hi - lo > 3) {
+      for ( i = hi-4; i >= lo; i-- ) {
+         tmp = fmap[i];
+         ec_tmp = eclass[tmp];
+         for ( j = i+4; j <= hi && ec_tmp > eclass[fmap[j]]; j += 4 )
+            fmap[j-4] = fmap[j];
+         fmap[j-4] = tmp;
+      }
+   }
+
+   for ( i = hi-1; i >= lo; i-- ) {
+      tmp = fmap[i];
+      ec_tmp = eclass[tmp];
+      for ( j = i+1; j <= hi && ec_tmp > eclass[fmap[j]]; j++ )
+         fmap[j-1] = fmap[j];
+      fmap[j-1] = tmp;
+   }
+}
+
+
+/*---------------------------------------------*/
+#define fswap(zz1, zz2) \
+   { Int32 zztmp = zz1; zz1 = zz2; zz2 = zztmp; }
+
+#define fvswap(zzp1, zzp2, zzn)       \
+{                                     \
+   Int32 yyp1 = (zzp1);               \
+   Int32 yyp2 = (zzp2);               \
+   Int32 yyn  = (zzn);                \
+   while (yyn > 0) {                  \
+      fswap(fmap[yyp1], fmap[yyp2]);  \
+      yyp1++; yyp2++; yyn--;          \
+   }                                  \
+}
+
+
+#define fmin(a,b) ((a) < (b)) ? (a) : (b)
+
+#define fpush(lz,hz) { stackLo[sp] = lz; \
+                       stackHi[sp] = hz; \
+                       sp++; }
+
+#define fpop(lz,hz) { sp--;              \
+                      lz = stackLo[sp];  \
+                      hz = stackHi[sp]; }
+
+#define FALLBACK_QSORT_SMALL_THRESH 10
+#define FALLBACK_QSORT_STACK_SIZE   100
+
+
+static
+void fallbackQSort3 ( UInt32* fmap, 
+                      UInt32* eclass,
+                      Int32   loSt, 
+                      Int32   hiSt )
+{
+   Int32 unLo, unHi, ltLo, gtHi, n, m;
+   Int32 sp, lo, hi;
+   UInt32 med, r, r3;
+   Int32 stackLo[FALLBACK_QSORT_STACK_SIZE];
+   Int32 stackHi[FALLBACK_QSORT_STACK_SIZE];
+
+   r = 0;
+
+   sp = 0;
+   fpush ( loSt, hiSt );
+
+   while (sp > 0) {
+
+      AssertH ( sp < FALLBACK_QSORT_STACK_SIZE, 1004 );
+
+      fpop ( lo, hi );
+      if (hi - lo < FALLBACK_QSORT_SMALL_THRESH) {
+         fallbackSimpleSort ( fmap, eclass, lo, hi );
+         continue;
+      }
+
+      /* Random partitioning.  Median of 3 sometimes fails to
+         avoid bad cases.  Median of 9 seems to help but 
+         looks rather expensive.  This too seems to work but
+         is cheaper.  Guidance for the magic constants 
+         7621 and 32768 is taken from Sedgewick's algorithms
+         book, chapter 35.
+      */
+      r = ((r * 7621) + 1) % 32768;
+      r3 = r % 3;
+      if (r3 == 0) med = eclass[fmap[lo]]; else
+      if (r3 == 1) med = eclass[fmap[(lo+hi)>>1]]; else
+                   med = eclass[fmap[hi]];
+
+      unLo = ltLo = lo;
+      unHi = gtHi = hi;
+
+      while (1) {
+         while (1) {
+            if (unLo > unHi) break;
+            n = (Int32)eclass[fmap[unLo]] - (Int32)med;
+            if (n == 0) { 
+               fswap(fmap[unLo], fmap[ltLo]); 
+               ltLo++; unLo++; 
+               continue; 
+            };
+            if (n > 0) break;
+            unLo++;
+         }
+         while (1) {
+            if (unLo > unHi) break;
+            n = (Int32)eclass[fmap[unHi]] - (Int32)med;
+            if (n == 0) { 
+               fswap(fmap[unHi], fmap[gtHi]); 
+               gtHi--; unHi--; 
+               continue; 
+            };
+            if (n < 0) break;
+            unHi--;
+         }
+         if (unLo > unHi) break;
+         fswap(fmap[unLo], fmap[unHi]); unLo++; unHi--;
+      }
+
+      AssertD ( unHi == unLo-1, "fallbackQSort3(2)" );
+
+      if (gtHi < ltLo) continue;
+
+      n = fmin(ltLo-lo, unLo-ltLo); fvswap(lo, unLo-n, n);
+      m = fmin(hi-gtHi, gtHi-unHi); fvswap(unLo, hi-m+1, m);
+
+      n = lo + unLo - ltLo - 1;
+      m = hi - (gtHi - unHi) + 1;
+
+      if (n - lo > hi - m) {
+         fpush ( lo, n );
+         fpush ( m, hi );
+      } else {
+         fpush ( m, hi );
+         fpush ( lo, n );
+      }
+   }
+}
+
+#undef fmin
+#undef fpush
+#undef fpop
+#undef fswap
+#undef fvswap
+#undef FALLBACK_QSORT_SMALL_THRESH
+#undef FALLBACK_QSORT_STACK_SIZE
+
+
+/*---------------------------------------------*/
+/* Pre:
+      nblock > 0
+      eclass exists for [0 .. nblock-1]
+      ((UChar*)eclass) [0 .. nblock-1] holds block
+      ptr exists for [0 .. nblock-1]
+
+   Post:
+      ((UChar*)eclass) [0 .. nblock-1] holds block
+      All other areas of eclass destroyed
+      fmap [0 .. nblock-1] holds sorted order
+      bhtab [ 0 .. 2+(nblock/32) ] destroyed
+*/
+
+#define       SET_BH(zz)  bhtab[(zz) >> 5] |= (1 << ((zz) & 31))
+#define     CLEAR_BH(zz)  bhtab[(zz) >> 5] &= ~(1 << ((zz) & 31))
+#define     ISSET_BH(zz)  (bhtab[(zz) >> 5] & (1 << ((zz) & 31)))
+#define      WORD_BH(zz)  bhtab[(zz) >> 5]
+#define UNALIGNED_BH(zz)  ((zz) & 0x01f)
+
+static
+void fallbackSort ( UInt32* fmap, 
+                    UInt32* eclass, 
+                    UInt32* bhtab,
+                    Int32   nblock,
+                    Int32   verb )
+{
+   Int32 ftab[257];
+   Int32 ftabCopy[256];
+   Int32 H, i, j, k, l, r, cc, cc1;
+   Int32 nNotDone;
+   Int32 nBhtab;
+   UChar* eclass8 = (UChar*)eclass;
+
+   /*--
+      Initial 1-char radix sort to generate
+      initial fmap and initial BH bits.
+   --*/
+   if (verb >= 4)
+      VPrintf0 ( "        bucket sorting ...\n" );
+   for (i = 0; i < 257;    i++) ftab[i] = 0;
+   for (i = 0; i < nblock; i++) ftab[eclass8[i]]++;
+   for (i = 0; i < 256;    i++) ftabCopy[i] = ftab[i];
+   for (i = 1; i < 257;    i++) ftab[i] += ftab[i-1];
+
+   for (i = 0; i < nblock; i++) {
+      j = eclass8[i];
+      k = ftab[j] - 1;
+      ftab[j] = k;
+      fmap[k] = i;
+   }
+
+   nBhtab = 2 + (nblock / 32);
+   for (i = 0; i < nBhtab; i++) bhtab[i] = 0;
+   for (i = 0; i < 256; i++) SET_BH(ftab[i]);
+
+   /*--
+      Inductively refine the buckets.  Kind-of an
+      "exponential radix sort" (!), inspired by the
+      Manber-Myers suffix array construction algorithm.
+   --*/
+
+   /*-- set sentinel bits for block-end detection --*/
+   for (i = 0; i < 32; i++) { 
+      SET_BH(nblock + 2*i);
+      CLEAR_BH(nblock + 2*i + 1);
+   }
+
+   /*-- the log(N) loop --*/
+   H = 1;
+   while (1) {
+
+      if (verb >= 4) 
+         VPrintf1 ( "        depth %6d has ", H );
+
+      j = 0;
+      for (i = 0; i < nblock; i++) {
+         if (ISSET_BH(i)) j = i;
+         k = fmap[i] - H; if (k < 0) k += nblock;
+         eclass[k] = j;
+      }
+
+      nNotDone = 0;
+      r = -1;
+      while (1) {
+
+	 /*-- find the next non-singleton bucket --*/
+         k = r + 1;
+         while (ISSET_BH(k) && UNALIGNED_BH(k)) k++;
+         if (ISSET_BH(k)) {
+            while (WORD_BH(k) == 0xffffffff) k += 32;
+            while (ISSET_BH(k)) k++;
+         }
+         l = k - 1;
+         if (l >= nblock) break;
+         while (!ISSET_BH(k) && UNALIGNED_BH(k)) k++;
+         if (!ISSET_BH(k)) {
+            while (WORD_BH(k) == 0x00000000) k += 32;
+            while (!ISSET_BH(k)) k++;
+         }
+         r = k - 1;
+         if (r >= nblock) break;
+
+         /*-- now [l, r] bracket current bucket --*/
+         if (r > l) {
+            nNotDone += (r - l + 1);
+            fallbackQSort3 ( fmap, eclass, l, r );
+
+            /*-- scan bucket and generate header bits-- */
+            cc = -1;
+            for (i = l; i <= r; i++) {
+               cc1 = eclass[fmap[i]];
+               if (cc != cc1) { SET_BH(i); cc = cc1; };
+            }
+         }
+      }
+
+      if (verb >= 4) 
+         VPrintf1 ( "%6d unresolved strings\n", nNotDone );
+
+      H *= 2;
+      if (H > nblock || nNotDone == 0) break;
+   }
+
+   /*-- 
+      Reconstruct the original block in
+      eclass8 [0 .. nblock-1], since the
+      previous phase destroyed it.
+   --*/
+   if (verb >= 4)
+      VPrintf0 ( "        reconstructing block ...\n" );
+   j = 0;
+   for (i = 0; i < nblock; i++) {
+      while (ftabCopy[j] == 0) j++;
+      ftabCopy[j]--;
+      eclass8[fmap[i]] = (UChar)j;
+   }
+   AssertH ( j < 256, 1005 );
+}
+
+#undef       SET_BH
+#undef     CLEAR_BH
+#undef     ISSET_BH
+#undef      WORD_BH
+#undef UNALIGNED_BH
+
+
+/*---------------------------------------------*/
+/*--- The main, O(N^2 log(N)) sorting       ---*/
+/*--- algorithm.  Faster for "normal"       ---*/
+/*--- non-repetitive blocks.                ---*/
+/*---------------------------------------------*/
+
+/*---------------------------------------------*/
+static
+__inline__
+Bool mainGtU ( UInt32  i1, 
+               UInt32  i2,
+               UChar*  block, 
+               UInt16* quadrant,
+               UInt32  nblock,
+               Int32*  budget )
+{
+   Int32  k;
+   UChar  c1, c2;
+   UInt16 s1, s2;
+
+   AssertD ( i1 != i2, "mainGtU" );
+   /* 1 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 2 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 3 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 4 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 5 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 6 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 7 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 8 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 9 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 10 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 11 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+   /* 12 */
+   c1 = block[i1]; c2 = block[i2];
+   if (c1 != c2) return (c1 > c2);
+   i1++; i2++;
+
+   k = nblock + 8;
+
+   do {
+      /* 1 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 2 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 3 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 4 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 5 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 6 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 7 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+      /* 8 */
+      c1 = block[i1]; c2 = block[i2];
+      if (c1 != c2) return (c1 > c2);
+      s1 = quadrant[i1]; s2 = quadrant[i2];
+      if (s1 != s2) return (s1 > s2);
+      i1++; i2++;
+
+      if (i1 >= nblock) i1 -= nblock;
+      if (i2 >= nblock) i2 -= nblock;
+
+      k -= 8;
+      (*budget)--;
+   }
+      while (k >= 0);
+
+   return False;
+}
+
+
+/*---------------------------------------------*/
+/*--
+   Knuth's increments seem to work better
+   than Incerpi-Sedgewick here.  Possibly
+   because the number of elems to sort is
+   usually small, typically <= 20.
+--*/
+static
+Int32 incs[14] = { 1, 4, 13, 40, 121, 364, 1093, 3280,
+                   9841, 29524, 88573, 265720,
+                   797161, 2391484 };
+
+static
+void mainSimpleSort ( UInt32* ptr,
+                      UChar*  block,
+                      UInt16* quadrant,
+                      Int32   nblock,
+                      Int32   lo, 
+                      Int32   hi, 
+                      Int32   d,
+                      Int32*  budget )
+{
+   Int32 i, j, h, bigN, hp;
+   UInt32 v;
+
+   bigN = hi - lo + 1;
+   if (bigN < 2) return;
+
+   hp = 0;
+   while (incs[hp] < bigN) hp++;
+   hp--;
+
+   for (; hp >= 0; hp--) {
+      h = incs[hp];
+
+      i = lo + h;
+      while (True) {
+
+         /*-- copy 1 --*/
+         if (i > hi) break;
+         v = ptr[i];
+         j = i;
+         while ( mainGtU ( 
+                    ptr[j-h]+d, v+d, block, quadrant, nblock, budget 
+                 ) ) {
+            ptr[j] = ptr[j-h];
+            j = j - h;
+            if (j <= (lo + h - 1)) break;
+         }
+         ptr[j] = v;
+         i++;
+
+         /*-- copy 2 --*/
+         if (i > hi) break;
+         v = ptr[i];
+         j = i;
+         while ( mainGtU ( 
+                    ptr[j-h]+d, v+d, block, quadrant, nblock, budget 
+                 ) ) {
+            ptr[j] = ptr[j-h];
+            j = j - h;
+            if (j <= (lo + h - 1)) break;
+         }
+         ptr[j] = v;
+         i++;
+
+         /*-- copy 3 --*/
+         if (i > hi) break;
+         v = ptr[i];
+         j = i;
+         while ( mainGtU ( 
+                    ptr[j-h]+d, v+d, block, quadrant, nblock, budget 
+                 ) ) {
+            ptr[j] = ptr[j-h];
+            j = j - h;
+            if (j <= (lo + h - 1)) break;
+         }
+         ptr[j] = v;
+         i++;
+
+         if (*budget < 0) return;
+      }
+   }
+}
+
+
+/*---------------------------------------------*/
+/*--
+   The following is an implementation of
+   an elegant 3-way quicksort for strings,
+   described in a paper "Fast Algorithms for
+   Sorting and Searching Strings", by Robert
+   Sedgewick and Jon L. Bentley.
+--*/
+
+#define mswap(zz1, zz2) \
+   { Int32 zztmp = zz1; zz1 = zz2; zz2 = zztmp; }
+
+#define mvswap(zzp1, zzp2, zzn)       \
+{                                     \
+   Int32 yyp1 = (zzp1);               \
+   Int32 yyp2 = (zzp2);               \
+   Int32 yyn  = (zzn);                \
+   while (yyn > 0) {                  \
+      mswap(ptr[yyp1], ptr[yyp2]);    \
+      yyp1++; yyp2++; yyn--;          \
+   }                                  \
+}
+
+static 
+__inline__
+UChar mmed3 ( UChar a, UChar b, UChar c )
+{
+   UChar t;
+   if (a > b) { t = a; a = b; b = t; };
+   if (b > c) { 
+      b = c;
+      if (a > b) b = a;
+   }
+   return b;
+}
+
+#define mmin(a,b) ((a) < (b)) ? (a) : (b)
+
+#define mpush(lz,hz,dz) { stackLo[sp] = lz; \
+                          stackHi[sp] = hz; \
+                          stackD [sp] = dz; \
+                          sp++; }
+
+#define mpop(lz,hz,dz) { sp--;             \
+                         lz = stackLo[sp]; \
+                         hz = stackHi[sp]; \
+                         dz = stackD [sp]; }
+
+
+#define mnextsize(az) (nextHi[az]-nextLo[az])
+
+#define mnextswap(az,bz)                                        \
+   { Int32 tz;                                                  \
+     tz = nextLo[az]; nextLo[az] = nextLo[bz]; nextLo[bz] = tz; \
+     tz = nextHi[az]; nextHi[az] = nextHi[bz]; nextHi[bz] = tz; \
+     tz = nextD [az]; nextD [az] = nextD [bz]; nextD [bz] = tz; }
+
+
+#define MAIN_QSORT_SMALL_THRESH 20
+#define MAIN_QSORT_DEPTH_THRESH (BZ_N_RADIX + BZ_N_QSORT)
+#define MAIN_QSORT_STACK_SIZE 100
+
+static
+void mainQSort3 ( UInt32* ptr,
+                  UChar*  block,
+                  UInt16* quadrant,
+                  Int32   nblock,
+                  Int32   loSt, 
+                  Int32   hiSt, 
+                  Int32   dSt,
+                  Int32*  budget )
+{
+   Int32 unLo, unHi, ltLo, gtHi, n, m, med;
+   Int32 sp, lo, hi, d;
+
+   Int32 stackLo[MAIN_QSORT_STACK_SIZE];
+   Int32 stackHi[MAIN_QSORT_STACK_SIZE];
+   Int32 stackD [MAIN_QSORT_STACK_SIZE];
+
+   Int32 nextLo[3];
+   Int32 nextHi[3];
+   Int32 nextD [3];
+
+   sp = 0;
+   mpush ( loSt, hiSt, dSt );
+
+   while (sp > 0) {
+
+      AssertH ( sp < MAIN_QSORT_STACK_SIZE, 1001 );
+
+      mpop ( lo, hi, d );
+      if (hi - lo < MAIN_QSORT_SMALL_THRESH || 
+          d > MAIN_QSORT_DEPTH_THRESH) {
+         mainSimpleSort ( ptr, block, quadrant, nblock, lo, hi, d, budget );
+         if (*budget < 0) return;
+         continue;
+      }
+
+      med = (Int32) 
+            mmed3 ( block[ptr[ lo         ]+d],
+                    block[ptr[ hi         ]+d],
+                    block[ptr[ (lo+hi)>>1 ]+d] );
+
+      unLo = ltLo = lo;
+      unHi = gtHi = hi;
+
+      while (True) {
+         while (True) {
+            if (unLo > unHi) break;
+            n = ((Int32)block[ptr[unLo]+d]) - med;
+            if (n == 0) { 
+               mswap(ptr[unLo], ptr[ltLo]); 
+               ltLo++; unLo++; continue; 
+            };
+            if (n >  0) break;
+            unLo++;
+         }
+         while (True) {
+            if (unLo > unHi) break;
+            n = ((Int32)block[ptr[unHi]+d]) - med;
+            if (n == 0) { 
+               mswap(ptr[unHi], ptr[gtHi]); 
+               gtHi--; unHi--; continue; 
+            };
+            if (n <  0) break;
+            unHi--;
+         }
+         if (unLo > unHi) break;
+         mswap(ptr[unLo], ptr[unHi]); unLo++; unHi--;
+      }
+
+      AssertD ( unHi == unLo-1, "mainQSort3(2)" );
+
+      if (gtHi < ltLo) {
+         mpush(lo, hi, d+1 );
+         continue;
+      }
+
+      n = mmin(ltLo-lo, unLo-ltLo); mvswap(lo, unLo-n, n);
+      m = mmin(hi-gtHi, gtHi-unHi); mvswap(unLo, hi-m+1, m);
+
+      n = lo + unLo - ltLo - 1;
+      m = hi - (gtHi - unHi) + 1;
+
+      nextLo[0] = lo;  nextHi[0] = n;   nextD[0] = d;
+      nextLo[1] = m;   nextHi[1] = hi;  nextD[1] = d;
+      nextLo[2] = n+1; nextHi[2] = m-1; nextD[2] = d+1;
+
+      if (mnextsize(0) < mnextsize(1)) mnextswap(0,1);
+      if (mnextsize(1) < mnextsize(2)) mnextswap(1,2);
+      if (mnextsize(0) < mnextsize(1)) mnextswap(0,1);
+
+      AssertD (mnextsize(0) >= mnextsize(1), "mainQSort3(8)" );
+      AssertD (mnextsize(1) >= mnextsize(2), "mainQSort3(9)" );
+
+      mpush (nextLo[0], nextHi[0], nextD[0]);
+      mpush (nextLo[1], nextHi[1], nextD[1]);
+      mpush (nextLo[2], nextHi[2], nextD[2]);
+   }
+}
+
+#undef mswap
+#undef mvswap
+#undef mpush
+#undef mpop
+#undef mmin
+#undef mnextsize
+#undef mnextswap
+#undef MAIN_QSORT_SMALL_THRESH
+#undef MAIN_QSORT_DEPTH_THRESH
+#undef MAIN_QSORT_STACK_SIZE
+
+
+/*---------------------------------------------*/
+/* Pre:
+      nblock > N_OVERSHOOT
+      block32 exists for [0 .. nblock-1 +N_OVERSHOOT]
+      ((UChar*)block32) [0 .. nblock-1] holds block
+      ptr exists for [0 .. nblock-1]
+
+   Post:
+      ((UChar*)block32) [0 .. nblock-1] holds block
+      All other areas of block32 destroyed
+      ftab [0 .. 65536 ] destroyed
+      ptr [0 .. nblock-1] holds sorted order
+      if (*budget < 0), sorting was abandoned
+*/
+
+#define BIGFREQ(b) (ftab[((b)+1) << 8] - ftab[(b) << 8])
+#define SETMASK (1 << 21)
+#define CLEARMASK (~(SETMASK))
+
+static
+void mainSort ( UInt32* ptr, 
+                UChar*  block,
+                UInt16* quadrant, 
+                UInt32* ftab,
+                Int32   nblock,
+                Int32   verb,
+                Int32*  budget )
+{
+   Int32  i, j, k, ss, sb;
+   Int32  runningOrder[256];
+   Bool   bigDone[256];
+   Int32  copyStart[256];
+   Int32  copyEnd  [256];
+   UChar  c1;
+   Int32  numQSorted;
+   UInt16 s;
+   if (verb >= 4) VPrintf0 ( "        main sort initialise ...\n" );
+
+   /*-- set up the 2-byte frequency table --*/
+   for (i = 65536; i >= 0; i--) ftab[i] = 0;
+
+   j = block[0] << 8;
+   i = nblock-1;
+   for (; i >= 3; i -= 4) {
+      quadrant[i] = 0;
+      j = (j >> 8) | ( ((UInt16)block[i]) << 8);
+      ftab[j]++;
+      quadrant[i-1] = 0;
+      j = (j >> 8) | ( ((UInt16)block[i-1]) << 8);
+      ftab[j]++;
+      quadrant[i-2] = 0;
+      j = (j >> 8) | ( ((UInt16)block[i-2]) << 8);
+      ftab[j]++;
+      quadrant[i-3] = 0;
+      j = (j >> 8) | ( ((UInt16)block[i-3]) << 8);
+      ftab[j]++;
+   }
+   for (; i >= 0; i--) {
+      quadrant[i] = 0;
+      j = (j >> 8) | ( ((UInt16)block[i]) << 8);
+      ftab[j]++;
+   }
+
+   /*-- (emphasises close relationship of block & quadrant) --*/
+   for (i = 0; i < BZ_N_OVERSHOOT; i++) {
+      block   [nblock+i] = block[i];
+      quadrant[nblock+i] = 0;
+   }
+
+   if (verb >= 4) VPrintf0 ( "        bucket sorting ...\n" );
+
+   /*-- Complete the initial radix sort --*/
+   for (i = 1; i <= 65536; i++) ftab[i] += ftab[i-1];
+
+   s = block[0] << 8;
+   i = nblock-1;
+   for (; i >= 3; i -= 4) {
+      s = (s >> 8) | (block[i] << 8);
+      j = ftab[s] -1;
+      ftab[s] = j;
+      ptr[j] = i;
+      s = (s >> 8) | (block[i-1] << 8);
+      j = ftab[s] -1;
+      ftab[s] = j;
+      ptr[j] = i-1;
+      s = (s >> 8) | (block[i-2] << 8);
+      j = ftab[s] -1;
+      ftab[s] = j;
+      ptr[j] = i-2;
+      s = (s >> 8) | (block[i-3] << 8);
+      j = ftab[s] -1;
+      ftab[s] = j;
+      ptr[j] = i-3;
+   }
+   for (; i >= 0; i--) {
+      s = (s >> 8) | (block[i] << 8);
+      j = ftab[s] -1;
+      ftab[s] = j;
+      ptr[j] = i;
+   }
+
+   /*--
+      Now ftab contains the first loc of every small bucket.
+      Calculate the running order, from smallest to largest
+      big bucket.
+   --*/
+   for (i = 0; i <= 255; i++) {
+      bigDone     [i] = False;
+      runningOrder[i] = i;
+   }
+
+   {
+      Int32 vv;
+      Int32 h = 1;
+      do h = 3 * h + 1; while (h <= 256);
+      do {
+         h = h / 3;
+         for (i = h; i <= 255; i++) {
+            vv = runningOrder[i];
+            j = i;
+            while ( BIGFREQ(runningOrder[j-h]) > BIGFREQ(vv) ) {
+               runningOrder[j] = runningOrder[j-h];
+               j = j - h;
+               if (j <= (h - 1)) goto zero;
+            }
+            zero:
+            runningOrder[j] = vv;
+         }
+      } while (h != 1);
+   }
+
+   /*--
+      The main sorting loop.
+   --*/
+
+   numQSorted = 0;
+
+   for (i = 0; i <= 255; i++) {
+
+      /*--
+         Process big buckets, starting with the least full.
+         Basically this is a 3-step process in which we call
+         mainQSort3 to sort the small buckets [ss, j], but
+         also make a big effort to avoid the calls if we can.
+      --*/
+      ss = runningOrder[i];
+
+      /*--
+         Step 1:
+         Complete the big bucket [ss] by quicksorting
+         any unsorted small buckets [ss, j], for j != ss.  
+         Hopefully previous pointer-scanning phases have already
+         completed many of the small buckets [ss, j], so
+         we don't have to sort them at all.
+      --*/
+      for (j = 0; j <= 255; j++) {
+         if (j != ss) {
+            sb = (ss << 8) + j;
+            if ( ! (ftab[sb] & SETMASK) ) {
+               Int32 lo = ftab[sb]   & CLEARMASK;
+               Int32 hi = (ftab[sb+1] & CLEARMASK) - 1;
+               if (hi > lo) {
+                  if (verb >= 4)
+                     VPrintf4 ( "        qsort [0x%x, 0x%x]   "
+                                "done %d   this %d\n",
+                                ss, j, numQSorted, hi - lo + 1 );
+                  mainQSort3 ( 
+                     ptr, block, quadrant, nblock, 
+                     lo, hi, BZ_N_RADIX, budget 
+                  );   
+                  numQSorted += (hi - lo + 1);
+                  if (*budget < 0) return;
+               }
+            }
+            ftab[sb] |= SETMASK;
+         }
+      }
+
+      AssertH ( !bigDone[ss], 1006 );
+
+      /*--
+         Step 2:
+         Now scan this big bucket [ss] so as to synthesise the
+         sorted order for small buckets [t, ss] for all t,
+         including, magically, the bucket [ss,ss] too.
+         This will avoid doing Real Work in subsequent Step 1's.
+      --*/
+      {
+         for (j = 0; j <= 255; j++) {
+            copyStart[j] =  ftab[(j << 8) + ss]     & CLEARMASK;
+            copyEnd  [j] = (ftab[(j << 8) + ss + 1] & CLEARMASK) - 1;
+         }
+         for (j = ftab[ss << 8] & CLEARMASK; j < copyStart[ss]; j++) {
+            k = ptr[j]-1; if (k < 0) k += nblock;
+            c1 = block[k];
+            if (!bigDone[c1])
+               ptr[ copyStart[c1]++ ] = k;
+         }
+         for (j = (ftab[(ss+1) << 8] & CLEARMASK) - 1; j > copyEnd[ss]; j--) {
+            k = ptr[j]-1; if (k < 0) k += nblock;
+            c1 = block[k];
+            if (!bigDone[c1]) 
+               ptr[ copyEnd[c1]-- ] = k;
+         }
+      }
+
+      AssertH ( copyStart[ss]-1 == copyEnd[ss], 1007 );
+
+      for (j = 0; j <= 255; j++) ftab[(j << 8) + ss] |= SETMASK;
+
+      /*--
+         Step 3:
+         The [ss] big bucket is now done.  Record this fact,
+         and update the quadrant descriptors.  Remember to
+         update quadrants in the overshoot area too, if
+         necessary.  The "if (i < 255)" test merely skips
+         this updating for the last bucket processed, since
+         updating for the last bucket is pointless.
+
+         The quadrant array provides a way to incrementally
+         cache sort orderings, as they appear, so as to 
+         make subsequent comparisons in fullGtU() complete
+         faster.  For repetitive blocks this makes a big
+         difference (but not big enough to be able to avoid
+         the fallback sorting mechanism, exponential radix sort).
+
+         The precise meaning is: at all times:
+
+            for 0 <= i < nblock and 0 <= j <= nblock
+
+            if block[i] != block[j], 
+
+               then the relative values of quadrant[i] and 
+                    quadrant[j] are meaningless.
+
+               else {
+                  if quadrant[i] < quadrant[j]
+                     then the string starting at i lexicographically
+                     precedes the string starting at j
+
+                  else if quadrant[i] > quadrant[j]
+                     then the string starting at j lexicographically
+                     precedes the string starting at i
+
+                  else
+                     the relative ordering of the strings starting
+                     at i and j has not yet been determined.
+               }
+      --*/
+      bigDone[ss] = True;
+
+      if (i < 255) {
+         Int32 bbStart  = ftab[ss << 8] & CLEARMASK;
+         Int32 bbSize   = (ftab[(ss+1) << 8] & CLEARMASK) - bbStart;
+         Int32 shifts   = 0;
+
+         while ((bbSize >> shifts) > 65534) shifts++;
+
+         for (j = bbSize-1; j >= 0; j--) {
+            Int32 a2update     = ptr[bbStart + j];
+            UInt16 qVal        = (UInt16)(j >> shifts);
+            quadrant[a2update] = qVal;
+            if (a2update < BZ_N_OVERSHOOT)
+               quadrant[a2update + nblock] = qVal;
+         }
+         AssertH ( ((bbSize-1) >> shifts) <= 65535, 1002 );
+      }
+
+   }
+
+   if (verb >= 4)
+      VPrintf3 ( "        %d pointers, %d sorted, %d scanned\n",
+                 nblock, numQSorted, nblock - numQSorted );
+}
+
+#undef BIGFREQ
+#undef SETMASK
+#undef CLEARMASK
+
+
+/*---------------------------------------------*/
+/* Pre:
+      nblock > 0
+      arr2 exists for [0 .. nblock-1 +N_OVERSHOOT]
+      ((UChar*)arr2)  [0 .. nblock-1] holds block
+      arr1 exists for [0 .. nblock-1]
+
+   Post:
+      ((UChar*)arr2) [0 .. nblock-1] holds block
+      All other areas of block destroyed
+      ftab [ 0 .. 65536 ] destroyed
+      arr1 [0 .. nblock-1] holds sorted order
+*/
+void BZ2_blockSort ( EState* s )
+{
+   UInt32* ptr    = s->ptr; 
+   UChar*  block  = s->block;
+   UInt32* ftab   = s->ftab;
+   Int32   nblock = s->nblock;
+   Int32   verb   = s->verbosity;
+   Int32   wfact  = s->workFactor;
+   UInt16* quadrant;
+   Int32   budget;
+   Int32   budgetInit;
+   Int32   i;
+
+   if (nblock < 10000) {
+      fallbackSort ( s->arr1, s->arr2, ftab, nblock, verb );
+   } else {
+      /* Calculate the location for quadrant, remembering to get
+         the alignment right.  Assumes that &(block[0]) is at least
+         2-byte aligned -- this should be ok since block is really
+         the first section of arr2.
+      */
+      i = nblock+BZ_N_OVERSHOOT;
+      if (i & 1) i++;
+      quadrant = (UInt16*)(&(block[i]));
+
+      /* (wfact-1) / 3 puts the default-factor-30
+         transition point at very roughly the same place as 
+         with v0.1 and v0.9.0.  
+         Not that it particularly matters any more, since the
+         resulting compressed stream is now the same regardless
+         of whether or not we use the main sort or fallback sort.
+      */
+      if (wfact < 1  ) wfact = 1;
+      if (wfact > 100) wfact = 100;
+      budgetInit = nblock * ((wfact-1) / 3);
+      budget = budgetInit;
+
+      mainSort ( ptr, block, quadrant, ftab, nblock, verb, &budget );
+      if (verb >= 3) 
+         VPrintf3 ( "      %d work, %d block, ratio %5.2f\n",
+                    budgetInit - budget,
+                    nblock, 
+                    (float)(budgetInit - budget) /
+                    (float)(nblock==0 ? 1 : nblock) ); 
+      if (budget < 0) {
+         if (verb >= 2) 
+            VPrintf0 ( "    too repetitive; using fallback"
+                       " sorting algorithm\n" );
+         fallbackSort ( s->arr1, s->arr2, ftab, nblock, verb );
+      }
+   }
+
+   s->origPtr = -1;
+   for (i = 0; i < s->nblock; i++)
+      if (ptr[i] == 0)
+         { s->origPtr = i; break; };
+
+   AssertH( s->origPtr != -1, 1003 );
+}
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                       blocksort.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/winsup/bz2lib/bzip2.1 b/winsup/bz2lib/bzip2.1
new file mode 100644
index 000000000..7de54a011
--- /dev/null
+++ b/winsup/bz2lib/bzip2.1
@@ -0,0 +1,439 @@
+.PU
+.TH bzip2 1
+.SH NAME
+bzip2, bunzip2 \- a block-sorting file compressor, v1.0
+.br
+bzcat \- decompresses files to stdout
+.br
+bzip2recover \- recovers data from damaged bzip2 files
+
+.SH SYNOPSIS
+.ll +8
+.B bzip2
+.RB [ " \-cdfkqstvzVL123456789 " ]
+[
+.I "filenames \&..."
+]
+.ll -8
+.br
+.B bunzip2
+.RB [ " \-fkvsVL " ]
+[ 
+.I "filenames \&..."
+]
+.br
+.B bzcat
+.RB [ " \-s " ]
+[ 
+.I "filenames \&..."
+]
+.br
+.B bzip2recover
+.I "filename"
+
+.SH DESCRIPTION
+.I bzip2
+compresses files using the Burrows-Wheeler block sorting
+text compression algorithm, and Huffman coding.  Compression is
+generally considerably better than that achieved by more conventional
+LZ77/LZ78-based compressors, and approaches the performance of the PPM
+family of statistical compressors.
+
+The command-line options are deliberately very similar to 
+those of 
+.I GNU gzip, 
+but they are not identical.
+
+.I bzip2
+expects a list of file names to accompany the
+command-line flags.  Each file is replaced by a compressed version of
+itself, with the name "original_name.bz2".  
+Each compressed file
+has the same modification date, permissions, and, when possible,
+ownership as the corresponding original, so that these properties can
+be correctly restored at decompression time.  File name handling is
+naive in the sense that there is no mechanism for preserving original
+file names, permissions, ownerships or dates in filesystems which lack
+these concepts, or have serious file name length restrictions, such as
+MS-DOS.
+
+.I bzip2
+and
+.I bunzip2
+will by default not overwrite existing
+files.  If you want this to happen, specify the \-f flag.
+
+If no file names are specified,
+.I bzip2
+compresses from standard
+input to standard output.  In this case,
+.I bzip2
+will decline to
+write compressed output to a terminal, as this would be entirely
+incomprehensible and therefore pointless.
+
+.I bunzip2
+(or
+.I bzip2 \-d) 
+decompresses all
+specified files.  Files which were not created by 
+.I bzip2
+will be detected and ignored, and a warning issued.  
+.I bzip2
+attempts to guess the filename for the decompressed file 
+from that of the compressed file as follows:
+
+       filename.bz2    becomes   filename
+       filename.bz     becomes   filename
+       filename.tbz2   becomes   filename.tar
+       filename.tbz    becomes   filename.tar
+       anyothername    becomes   anyothername.out
+
+If the file does not end in one of the recognised endings, 
+.I .bz2, 
+.I .bz, 
+.I .tbz2
+or
+.I .tbz, 
+.I bzip2 
+complains that it cannot
+guess the name of the original file, and uses the original name
+with
+.I .out
+appended.
+
+As with compression, supplying no
+filenames causes decompression from 
+standard input to standard output.
+
+.I bunzip2 
+will correctly decompress a file which is the
+concatenation of two or more compressed files.  The result is the
+concatenation of the corresponding uncompressed files.  Integrity
+testing (\-t) 
+of concatenated 
+compressed files is also supported.
+
+You can also compress or decompress files to the standard output by
+giving the \-c flag.  Multiple files may be compressed and
+decompressed like this.  The resulting outputs are fed sequentially to
+stdout.  Compression of multiple files 
+in this manner generates a stream
+containing multiple compressed file representations.  Such a stream
+can be decompressed correctly only by
+.I bzip2 
+version 0.9.0 or
+later.  Earlier versions of
+.I bzip2
+will stop after decompressing
+the first file in the stream.
+
+.I bzcat
+(or
+.I bzip2 -dc) 
+decompresses all specified files to
+the standard output.
+
+.I bzip2
+will read arguments from the environment variables
+.I BZIP2
+and
+.I BZIP,
+in that order, and will process them
+before any arguments read from the command line.  This gives a 
+convenient way to supply default arguments.
+
+Compression is always performed, even if the compressed 
+file is slightly
+larger than the original.  Files of less than about one hundred bytes
+tend to get larger, since the compression mechanism has a constant
+overhead in the region of 50 bytes.  Random data (including the output
+of most file compressors) is coded at about 8.05 bits per byte, giving
+an expansion of around 0.5%.
+
+As a self-check for your protection, 
+.I 
+bzip2
+uses 32-bit CRCs to
+make sure that the decompressed version of a file is identical to the
+original.  This guards against corruption of the compressed data, and
+against undetected bugs in
+.I bzip2
+(hopefully very unlikely).  The
+chances of data corruption going undetected is microscopic, about one
+chance in four billion for each file processed.  Be aware, though, that
+the check occurs upon decompression, so it can only tell you that
+something is wrong.  It can't help you 
+recover the original uncompressed
+data.  You can use 
+.I bzip2recover
+to try to recover data from
+damaged files.
+
+Return values: 0 for a normal exit, 1 for environmental problems (file
+not found, invalid flags, I/O errors, &c), 2 to indicate a corrupt
+compressed file, 3 for an internal consistency error (eg, bug) which
+caused
+.I bzip2
+to panic.
+
+.SH OPTIONS
+.TP
+.B \-c --stdout
+Compress or decompress to standard output.
+.TP
+.B \-d --decompress
+Force decompression.  
+.I bzip2, 
+.I bunzip2 
+and
+.I bzcat 
+are
+really the same program, and the decision about what actions to take is
+done on the basis of which name is used.  This flag overrides that
+mechanism, and forces 
+.I bzip2
+to decompress.
+.TP
+.B \-z --compress
+The complement to \-d: forces compression, regardless of the
+invokation name.
+.TP
+.B \-t --test
+Check integrity of the specified file(s), but don't decompress them.
+This really performs a trial decompression and throws away the result.
+.TP
+.B \-f --force
+Force overwrite of output files.  Normally,
+.I bzip2 
+will not overwrite
+existing output files.  Also forces 
+.I bzip2 
+to break hard links
+to files, which it otherwise wouldn't do.
+.TP
+.B \-k --keep
+Keep (don't delete) input files during compression
+or decompression.
+.TP
+.B \-s --small
+Reduce memory usage, for compression, decompression and testing.  Files
+are decompressed and tested using a modified algorithm which only
+requires 2.5 bytes per block byte.  This means any file can be
+decompressed in 2300k of memory, albeit at about half the normal speed.
+
+During compression, \-s selects a block size of 200k, which limits
+memory use to around the same figure, at the expense of your compression
+ratio.  In short, if your machine is low on memory (8 megabytes or
+less), use \-s for everything.  See MEMORY MANAGEMENT below.
+.TP
+.B \-q --quiet
+Suppress non-essential warning messages.  Messages pertaining to
+I/O errors and other critical events will not be suppressed.
+.TP
+.B \-v --verbose
+Verbose mode -- show the compression ratio for each file processed.
+Further \-v's increase the verbosity level, spewing out lots of
+information which is primarily of interest for diagnostic purposes.
+.TP
+.B \-L --license -V --version
+Display the software version, license terms and conditions.
+.TP
+.B \-1 to \-9
+Set the block size to 100 k, 200 k ..  900 k when compressing.  Has no
+effect when decompressing.  See MEMORY MANAGEMENT below.
+.TP
+.B \--
+Treats all subsequent arguments as file names, even if they start
+with a dash.  This is so you can handle files with names beginning
+with a dash, for example: bzip2 \-- \-myfilename.
+.TP
+.B \--repetitive-fast --repetitive-best
+These flags are redundant in versions 0.9.5 and above.  They provided
+some coarse control over the behaviour of the sorting algorithm in
+earlier versions, which was sometimes useful.  0.9.5 and above have an
+improved algorithm which renders these flags irrelevant.
+
+.SH MEMORY MANAGEMENT
+.I bzip2 
+compresses large files in blocks.  The block size affects
+both the compression ratio achieved, and the amount of memory needed for
+compression and decompression.  The flags \-1 through \-9
+specify the block size to be 100,000 bytes through 900,000 bytes (the
+default) respectively.  At decompression time, the block size used for
+compression is read from the header of the compressed file, and
+.I bunzip2
+then allocates itself just enough memory to decompress
+the file.  Since block sizes are stored in compressed files, it follows
+that the flags \-1 to \-9 are irrelevant to and so ignored
+during decompression.
+
+Compression and decompression requirements, 
+in bytes, can be estimated as:
+
+       Compression:   400k + ( 8 x block size )
+
+       Decompression: 100k + ( 4 x block size ), or
+                      100k + ( 2.5 x block size )
+
+Larger block sizes give rapidly diminishing marginal returns.  Most of
+the compression comes from the first two or three hundred k of block
+size, a fact worth bearing in mind when using
+.I bzip2
+on small machines.
+It is also important to appreciate that the decompression memory
+requirement is set at compression time by the choice of block size.
+
+For files compressed with the default 900k block size,
+.I bunzip2
+will require about 3700 kbytes to decompress.  To support decompression
+of any file on a 4 megabyte machine, 
+.I bunzip2
+has an option to
+decompress using approximately half this amount of memory, about 2300
+kbytes.  Decompression speed is also halved, so you should use this
+option only where necessary.  The relevant flag is -s.
+
+In general, try and use the largest block size memory constraints allow,
+since that maximises the compression achieved.  Compression and
+decompression speed are virtually unaffected by block size.
+
+Another significant point applies to files which fit in a single block
+-- that means most files you'd encounter using a large block size.  The
+amount of real memory touched is proportional to the size of the file,
+since the file is smaller than a block.  For example, compressing a file
+20,000 bytes long with the flag -9 will cause the compressor to
+allocate around 7600k of memory, but only touch 400k + 20000 * 8 = 560
+kbytes of it.  Similarly, the decompressor will allocate 3700k but only
+touch 100k + 20000 * 4 = 180 kbytes.
+
+Here is a table which summarises the maximum memory usage for different
+block sizes.  Also recorded is the total compressed size for 14 files of
+the Calgary Text Compression Corpus totalling 3,141,622 bytes.  This
+column gives some feel for how compression varies with block size.
+These figures tend to understate the advantage of larger block sizes for
+larger files, since the Corpus is dominated by smaller files.
+
+           Compress   Decompress   Decompress   Corpus
+    Flag     usage      usage       -s usage     Size
+
+     -1      1200k       500k         350k      914704
+     -2      2000k       900k         600k      877703
+     -3      2800k      1300k         850k      860338
+     -4      3600k      1700k        1100k      846899
+     -5      4400k      2100k        1350k      845160
+     -6      5200k      2500k        1600k      838626
+     -7      6100k      2900k        1850k      834096
+     -8      6800k      3300k        2100k      828642
+     -9      7600k      3700k        2350k      828642
+
+.SH RECOVERING DATA FROM DAMAGED FILES
+.I bzip2
+compresses files in blocks, usually 900kbytes long.  Each
+block is handled independently.  If a media or transmission error causes
+a multi-block .bz2
+file to become damaged, it may be possible to
+recover data from the undamaged blocks in the file.
+
+The compressed representation of each block is delimited by a 48-bit
+pattern, which makes it possible to find the block boundaries with
+reasonable certainty.  Each block also carries its own 32-bit CRC, so
+damaged blocks can be distinguished from undamaged ones.
+
+.I bzip2recover
+is a simple program whose purpose is to search for
+blocks in .bz2 files, and write each block out into its own .bz2 
+file.  You can then use
+.I bzip2 
+\-t
+to test the
+integrity of the resulting files, and decompress those which are
+undamaged.
+
+.I bzip2recover
+takes a single argument, the name of the damaged file, 
+and writes a number of files "rec0001file.bz2",
+"rec0002file.bz2", etc, containing the  extracted  blocks.
+The  output  filenames  are  designed  so  that the use of
+wildcards in subsequent processing -- for example,  
+"bzip2 -dc  rec*file.bz2 > recovered_data" -- lists the files in
+the correct order.
+
+.I bzip2recover
+should be of most use dealing with large .bz2
+files,  as  these will contain many blocks.  It is clearly
+futile to use it on damaged single-block  files,  since  a
+damaged  block  cannot  be recovered.  If you wish to minimise 
+any potential data loss through media  or  transmission errors, 
+you might consider compressing with a smaller
+block size.
+
+.SH PERFORMANCE NOTES
+The sorting phase of compression gathers together similar strings in the
+file.  Because of this, files containing very long runs of repeated
+symbols, like "aabaabaabaab ..."  (repeated several hundred times) may
+compress more slowly than normal.  Versions 0.9.5 and above fare much
+better than previous versions in this respect.  The ratio between
+worst-case and average-case compression time is in the region of 10:1.
+For previous versions, this figure was more like 100:1.  You can use the
+\-vvvv option to monitor progress in great detail, if you want.
+
+Decompression speed is unaffected by these phenomena.
+
+.I bzip2
+usually allocates several megabytes of memory to operate
+in, and then charges all over it in a fairly random fashion.  This means
+that performance, both for compressing and decompressing, is largely
+determined by the speed at which your machine can service cache misses.
+Because of this, small changes to the code to reduce the miss rate have
+been observed to give disproportionately large performance improvements.
+I imagine 
+.I bzip2
+will perform best on machines with very large caches.
+
+.SH CAVEATS
+I/O error messages are not as helpful as they could be.
+.I bzip2
+tries hard to detect I/O errors and exit cleanly, but the details of
+what the problem is sometimes seem rather misleading.
+
+This manual page pertains to version 1.0 of
+.I bzip2.  
+Compressed
+data created by this version is entirely forwards and backwards
+compatible with the previous public releases, versions 0.1pl2, 0.9.0
+and 0.9.5,
+but with the following exception: 0.9.0 and above can correctly
+decompress multiple concatenated compressed files.  0.1pl2 cannot do
+this; it will stop after decompressing just the first file in the
+stream.
+
+.I bzip2recover
+uses 32-bit integers to represent bit positions in
+compressed files, so it cannot handle compressed files more than 512
+megabytes long.  This could easily be fixed.
+
+.SH AUTHOR
+Julian Seward, jseward@acm.org.
+
+http://sourceware.cygnus.com/bzip2
+http://www.muraroa.demon.co.uk
+
+The ideas embodied in
+.I bzip2
+are due to (at least) the following
+people: Michael Burrows and David Wheeler (for the block sorting
+transformation), David Wheeler (again, for the Huffman coder), Peter
+Fenwick (for the structured coding model in the original
+.I bzip,
+and many refinements), and Alistair Moffat, Radford Neal and Ian Witten
+(for the arithmetic coder in the original
+.I bzip).  
+I am much
+indebted for their help, support and advice.  See the manual in the
+source distribution for pointers to sources of documentation.  Christian
+von Roques encouraged me to look for faster sorting algorithms, so as to
+speed up compression.  Bela Lubkin encouraged me to improve the
+worst-case compression performance.  Many people sent patches, helped
+with portability problems, lent machines, gave advice and were generally
+helpful.
diff --git a/winsup/bz2lib/bzip2.1.preformatted b/winsup/bz2lib/bzip2.1.preformatted
new file mode 100644
index 000000000..9f18339e9
--- /dev/null
+++ b/winsup/bz2lib/bzip2.1.preformatted
@@ -0,0 +1,462 @@
+
+
+
+bzip2(1)                                                 bzip2(1)
+
+
+NNAAMMEE
+       bzip2, bunzip2 - a block-sorting file compressor, v1.0
+       bzcat - decompresses files to stdout
+       bzip2recover - recovers data from damaged bzip2 files
+
+
+SSYYNNOOPPSSIISS
+       bbzziipp22 [ --ccddffkkqqssttvvzzVVLL112233445566778899 ] [ _f_i_l_e_n_a_m_e_s _._._.  ]
+       bbuunnzziipp22 [ --ffkkvvssVVLL ] [ _f_i_l_e_n_a_m_e_s _._._.  ]
+       bbzzccaatt [ --ss ] [ _f_i_l_e_n_a_m_e_s _._._.  ]
+       bbzziipp22rreeccoovveerr _f_i_l_e_n_a_m_e
+
+
+DDEESSCCRRIIPPTTIIOONN
+       _b_z_i_p_2  compresses  files  using  the Burrows-Wheeler block
+       sorting text compression algorithm,  and  Huffman  coding.
+       Compression  is  generally  considerably  better than that
+       achieved by more conventional LZ77/LZ78-based compressors,
+       and  approaches  the performance of the PPM family of sta-
+       tistical compressors.
+
+       The command-line options are deliberately very similar  to
+       those of _G_N_U _g_z_i_p_, but they are not identical.
+
+       _b_z_i_p_2  expects  a list of file names to accompany the com-
+       mand-line flags.  Each file is replaced  by  a  compressed
+       version  of  itself,  with  the  name "original_name.bz2".
+       Each compressed file has the same modification date,  per-
+       missions, and, when possible, ownership as the correspond-
+       ing original, so that these properties  can  be  correctly
+       restored  at  decompression  time.   File name handling is
+       naive in the sense that there is no mechanism for preserv-
+       ing  original file names, permissions, ownerships or dates
+       in filesystems which lack these concepts, or have  serious
+       file name length restrictions, such as MS-DOS.
+
+       _b_z_i_p_2  and  _b_u_n_z_i_p_2 will by default not overwrite existing
+       files.  If you want this to happen, specify the -f flag.
+
+       If no file names  are  specified,  _b_z_i_p_2  compresses  from
+       standard  input  to  standard output.  In this case, _b_z_i_p_2
+       will decline to write compressed output to a terminal,  as
+       this  would  be  entirely  incomprehensible  and therefore
+       pointless.
+
+       _b_u_n_z_i_p_2 (or _b_z_i_p_2 _-_d_) decompresses  all  specified  files.
+       Files which were not created by _b_z_i_p_2 will be detected and
+       ignored, and a warning issued.  _b_z_i_p_2  attempts  to  guess
+       the  filename  for  the decompressed file from that of the
+       compressed file as follows:
+
+              filename.bz2    becomes   filename
+              filename.bz     becomes   filename
+              filename.tbz2   becomes   filename.tar
+
+
+
+                                                                1
+
+
+
+
+
+bzip2(1)                                                 bzip2(1)
+
+
+              filename.tbz    becomes   filename.tar
+              anyothername    becomes   anyothername.out
+
+       If the file does not end in one of the recognised endings,
+       _._b_z_2_,  _._b_z_,  _._t_b_z_2 or _._t_b_z_, _b_z_i_p_2 complains that it cannot
+       guess the name of the original file, and uses the original
+       name with _._o_u_t appended.
+
+       As  with compression, supplying no filenames causes decom-
+       pression from standard input to standard output.
+
+       _b_u_n_z_i_p_2 will correctly decompress a file which is the con-
+       catenation of two or more compressed files.  The result is
+       the concatenation of the corresponding uncompressed files.
+       Integrity testing (-t) of concatenated compressed files is
+       also supported.
+
+       You can also compress or decompress files to the  standard
+       output  by giving the -c flag.  Multiple files may be com-
+       pressed and decompressed like this.  The resulting outputs
+       are  fed  sequentially to stdout.  Compression of multiple
+       files in this manner generates a stream containing  multi-
+       ple compressed file representations.  Such a stream can be
+       decompressed correctly only  by  _b_z_i_p_2  version  0.9.0  or
+       later.   Earlier  versions of _b_z_i_p_2 will stop after decom-
+       pressing the first file in the stream.
+
+       _b_z_c_a_t (or _b_z_i_p_2 _-_d_c_) decompresses all specified  files  to
+       the standard output.
+
+       _b_z_i_p_2  will  read arguments from the environment variables
+       _B_Z_I_P_2 and _B_Z_I_P_, in  that  order,  and  will  process  them
+       before  any  arguments  read  from the command line.  This
+       gives a convenient way to supply default arguments.
+
+       Compression is always performed, even  if  the  compressed
+       file  is slightly larger than the original.  Files of less
+       than about one hundred bytes tend to get larger, since the
+       compression  mechanism  has  a  constant  overhead  in the
+       region of 50 bytes.  Random data (including the output  of
+       most  file  compressors)  is  coded at about 8.05 bits per
+       byte, giving an expansion of around 0.5%.
+
+       As a self-check for your  protection,  _b_z_i_p_2  uses  32-bit
+       CRCs  to make sure that the decompressed version of a file
+       is identical to the original.  This guards against corrup-
+       tion  of  the compressed data, and against undetected bugs
+       in _b_z_i_p_2 (hopefully very unlikely).  The chances  of  data
+       corruption  going  undetected  is  microscopic,  about one
+       chance in four billion for each file processed.  Be aware,
+       though,  that  the  check occurs upon decompression, so it
+       can only tell you that something is wrong.  It can't  help
+       you  recover  the original uncompressed data.  You can use
+       _b_z_i_p_2_r_e_c_o_v_e_r to try to recover data from damaged files.
+
+
+
+                                                                2
+
+
+
+
+
+bzip2(1)                                                 bzip2(1)
+
+
+       Return values: 0 for a normal exit,  1  for  environmental
+       problems  (file not found, invalid flags, I/O errors, &c),
+       2 to indicate a corrupt compressed file, 3 for an internal
+       consistency error (eg, bug) which caused _b_z_i_p_2 to panic.
+
+
+OOPPTTIIOONNSS
+       --cc ----ssttddoouutt
+              Compress or decompress to standard output.
+
+       --dd ----ddeeccoommpprreessss
+              Force  decompression.  _b_z_i_p_2_, _b_u_n_z_i_p_2 and _b_z_c_a_t are
+              really the same program,  and  the  decision  about
+              what  actions to take is done on the basis of which
+              name is used.  This flag overrides that  mechanism,
+              and forces _b_z_i_p_2 to decompress.
+
+       --zz ----ccoommpprreessss
+              The  complement  to -d: forces compression, regard-
+              less of the invokation name.
+
+       --tt ----tteesstt
+              Check integrity of the specified file(s), but don't
+              decompress  them.   This  really  performs  a trial
+              decompression and throws away the result.
+
+       --ff ----ffoorrccee
+              Force overwrite of output files.   Normally,  _b_z_i_p_2
+              will  not  overwrite  existing  output files.  Also
+              forces _b_z_i_p_2 to break hard links to files, which it
+              otherwise wouldn't do.
+
+       --kk ----kkeeeepp
+              Keep  (don't delete) input files during compression
+              or decompression.
+
+       --ss ----ssmmaallll
+              Reduce memory usage, for compression, decompression
+              and  testing.   Files  are  decompressed and tested
+              using a modified algorithm which only requires  2.5
+              bytes  per  block byte.  This means any file can be
+              decompressed in 2300k of memory,  albeit  at  about
+              half the normal speed.
+
+              During  compression,  -s  selects  a  block size of
+              200k, which limits memory use to  around  the  same
+              figure,  at  the expense of your compression ratio.
+              In short, if your  machine  is  low  on  memory  (8
+              megabytes  or  less),  use  -s for everything.  See
+              MEMORY MANAGEMENT below.
+
+       --qq ----qquuiieett
+              Suppress non-essential warning messages.   Messages
+              pertaining  to I/O errors and other critical events
+
+
+
+                                                                3
+
+
+
+
+
+bzip2(1)                                                 bzip2(1)
+
+
+              will not be suppressed.
+
+       --vv ----vveerrbboossee
+              Verbose mode -- show the compression ratio for each
+              file  processed.   Further  -v's  increase the ver-
+              bosity level, spewing out lots of information which
+              is primarily of interest for diagnostic purposes.
+
+       --LL ----lliicceennssee --VV ----vveerrssiioonn
+              Display  the  software  version,  license terms and
+              conditions.
+
+       --11 ttoo --99
+              Set the block size to 100 k, 200 k ..  900  k  when
+              compressing.   Has  no  effect  when decompressing.
+              See MEMORY MANAGEMENT below.
+
+       ----     Treats all subsequent arguments as file names, even
+              if they start with a dash.  This is so you can han-
+              dle files with names beginning  with  a  dash,  for
+              example: bzip2 -- -myfilename.
+
+       ----rreeppeettiittiivvee--ffaasstt ----rreeppeettiittiivvee--bbeesstt
+              These  flags  are  redundant  in versions 0.9.5 and
+              above.  They provided some coarse control over  the
+              behaviour  of the sorting algorithm in earlier ver-
+              sions, which was sometimes useful.  0.9.5 and above
+              have  an  improved  algorithm  which  renders these
+              flags irrelevant.
+
+
+MMEEMMOORRYY MMAANNAAGGEEMMEENNTT
+       _b_z_i_p_2 compresses large files in blocks.   The  block  size
+       affects  both  the  compression  ratio  achieved,  and the
+       amount of memory needed for compression and decompression.
+       The  flags  -1  through  -9  specify  the block size to be
+       100,000 bytes through 900,000 bytes (the default)  respec-
+       tively.   At  decompression  time, the block size used for
+       compression is read from  the  header  of  the  compressed
+       file, and _b_u_n_z_i_p_2 then allocates itself just enough memory
+       to decompress the file.  Since block sizes are  stored  in
+       compressed  files,  it follows that the flags -1 to -9 are
+       irrelevant to and so ignored during decompression.
+
+       Compression and decompression requirements, in bytes,  can
+       be estimated as:
+
+              Compression:   400k + ( 8 x block size )
+
+              Decompression: 100k + ( 4 x block size ), or
+                             100k + ( 2.5 x block size )
+
+       Larger  block  sizes  give  rapidly  diminishing  marginal
+       returns.  Most of the compression comes from the first two
+
+
+
+                                                                4
+
+
+
+
+
+bzip2(1)                                                 bzip2(1)
+
+
+       or  three hundred k of block size, a fact worth bearing in
+       mind when using _b_z_i_p_2  on  small  machines.   It  is  also
+       important  to  appreciate  that  the  decompression memory
+       requirement is set at compression time by  the  choice  of
+       block size.
+
+       For  files  compressed  with  the default 900k block size,
+       _b_u_n_z_i_p_2 will require about 3700 kbytes to decompress.   To
+       support decompression of any file on a 4 megabyte machine,
+       _b_u_n_z_i_p_2 has an option to  decompress  using  approximately
+       half this amount of memory, about 2300 kbytes.  Decompres-
+       sion speed is also halved, so you should use  this  option
+       only where necessary.  The relevant flag is -s.
+
+       In general, try and use the largest block size memory con-
+       straints  allow,  since  that  maximises  the  compression
+       achieved.   Compression and decompression speed are virtu-
+       ally unaffected by block size.
+
+       Another significant point applies to files which fit in  a
+       single  block  --  that  means  most files you'd encounter
+       using a large block  size.   The  amount  of  real  memory
+       touched is proportional to the size of the file, since the
+       file is smaller than a block.  For example, compressing  a
+       file  20,000  bytes  long  with the flag -9 will cause the
+       compressor to allocate around 7600k of  memory,  but  only
+       touch 400k + 20000 * 8 = 560 kbytes of it.  Similarly, the
+       decompressor will allocate 3700k but  only  touch  100k  +
+       20000 * 4 = 180 kbytes.
+
+       Here  is a table which summarises the maximum memory usage
+       for different block sizes.  Also  recorded  is  the  total
+       compressed  size for 14 files of the Calgary Text Compres-
+       sion Corpus totalling 3,141,622 bytes.  This column  gives
+       some  feel  for  how  compression  varies with block size.
+       These figures tend to understate the advantage  of  larger
+       block  sizes  for  larger files, since the Corpus is domi-
+       nated by smaller files.
+
+                  Compress   Decompress   Decompress   Corpus
+           Flag     usage      usage       -s usage     Size
+
+            -1      1200k       500k         350k      914704
+            -2      2000k       900k         600k      877703
+            -3      2800k      1300k         850k      860338
+            -4      3600k      1700k        1100k      846899
+            -5      4400k      2100k        1350k      845160
+            -6      5200k      2500k        1600k      838626
+            -7      6100k      2900k        1850k      834096
+            -8      6800k      3300k        2100k      828642
+            -9      7600k      3700k        2350k      828642
+
+
+
+
+
+
+                                                                5
+
+
+
+
+
+bzip2(1)                                                 bzip2(1)
+
+
+RREECCOOVVEERRIINNGG DDAATTAA FFRROOMM DDAAMMAAGGEEDD FFIILLEESS
+       _b_z_i_p_2 compresses files in blocks, usually 900kbytes  long.
+       Each block is handled independently.  If a media or trans-
+       mission error causes a multi-block  .bz2  file  to  become
+       damaged,  it  may  be  possible  to  recover data from the
+       undamaged blocks in the file.
+
+       The compressed representation of each block  is  delimited
+       by  a  48-bit pattern, which makes it possible to find the
+       block boundaries with reasonable  certainty.   Each  block
+       also  carries its own 32-bit CRC, so damaged blocks can be
+       distinguished from undamaged ones.
+
+       _b_z_i_p_2_r_e_c_o_v_e_r is a  simple  program  whose  purpose  is  to
+       search  for blocks in .bz2 files, and write each block out
+       into its own .bz2 file.  You can then use _b_z_i_p_2 -t to test
+       the integrity of the resulting files, and decompress those
+       which are undamaged.
+
+       _b_z_i_p_2_r_e_c_o_v_e_r takes a single argument, the name of the dam-
+       aged file, and writes a number of files "rec0001file.bz2",
+       "rec0002file.bz2", etc, containing the  extracted  blocks.
+       The  output  filenames  are  designed  so  that the use of
+       wildcards in subsequent processing -- for example,  "bzip2
+       -dc   rec*file.bz2 > recovered_data" -- lists the files in
+       the correct order.
+
+       _b_z_i_p_2_r_e_c_o_v_e_r should be of most use dealing with large .bz2
+       files,  as  these will contain many blocks.  It is clearly
+       futile to use it on damaged single-block  files,  since  a
+       damaged  block  cannot  be recovered.  If you wish to min-
+       imise any potential data loss through media  or  transmis-
+       sion errors, you might consider compressing with a smaller
+       block size.
+
+
+PPEERRFFOORRMMAANNCCEE NNOOTTEESS
+       The sorting phase of compression gathers together  similar
+       strings  in  the  file.  Because of this, files containing
+       very long runs of  repeated  symbols,  like  "aabaabaabaab
+       ..."   (repeated  several hundred times) may compress more
+       slowly than normal.  Versions 0.9.5 and  above  fare  much
+       better  than previous versions in this respect.  The ratio
+       between worst-case and average-case compression time is in
+       the  region  of  10:1.  For previous versions, this figure
+       was more like 100:1.  You can use the -vvvv option to mon-
+       itor progress in great detail, if you want.
+
+       Decompression speed is unaffected by these phenomena.
+
+       _b_z_i_p_2  usually  allocates  several  megabytes of memory to
+       operate in, and then charges all over it in a fairly  ran-
+       dom  fashion.   This means that performance, both for com-
+       pressing and decompressing, is largely determined  by  the
+
+
+
+                                                                6
+
+
+
+
+
+bzip2(1)                                                 bzip2(1)
+
+
+       speed  at  which  your  machine  can service cache misses.
+       Because of this, small changes to the code to  reduce  the
+       miss  rate  have  been observed to give disproportionately
+       large performance improvements.  I imagine _b_z_i_p_2 will per-
+       form best on machines with very large caches.
+
+
+CCAAVVEEAATTSS
+       I/O  error  messages  are not as helpful as they could be.
+       _b_z_i_p_2 tries hard to detect I/O errors  and  exit  cleanly,
+       but  the  details  of  what  the problem is sometimes seem
+       rather misleading.
+
+       This manual page pertains to version 1.0 of  _b_z_i_p_2_.   Com-
+       pressed  data created by this version is entirely forwards
+       and  backwards  compatible  with   the   previous   public
+       releases,  versions  0.1pl2, 0.9.0 and 0.9.5, but with the
+       following exception: 0.9.0 and above can correctly  decom-
+       press multiple concatenated compressed files.  0.1pl2 can-
+       not do this; it will stop  after  decompressing  just  the
+       first file in the stream.
+
+       _b_z_i_p_2_r_e_c_o_v_e_r  uses  32-bit integers to represent bit posi-
+       tions in compressed files, so it cannot handle  compressed
+       files  more than 512 megabytes long.  This could easily be
+       fixed.
+
+
+AAUUTTHHOORR
+       Julian Seward, jseward@acm.org.
+
+       http://sourceware.cygnus.com/bzip2
+       http://www.muraroa.demon.co.uk
+
+       The ideas embodied in _b_z_i_p_2 are due to (at least) the fol-
+       lowing people: Michael Burrows and David Wheeler (for  the
+       block  sorting  transformation), David Wheeler (again, for
+       the Huffman coder), Peter Fenwick (for the structured cod-
+       ing model in the original _b_z_i_p_, and many refinements), and
+       Alistair Moffat, Radford Neal  and  Ian  Witten  (for  the
+       arithmetic  coder  in  the  original  _b_z_i_p_)_.   I  am  much
+       indebted for their help, support and advice.  See the man-
+       ual  in the source distribution for pointers to sources of
+       documentation.  Christian von Roques encouraged me to look
+       for  faster sorting algorithms, so as to speed up compres-
+       sion.  Bela Lubkin encouraged me to improve the worst-case
+       compression performance.  Many people sent patches, helped
+       with portability problems, lent machines, gave advice  and
+       were generally helpful.
+
+
+
+
+
+
+
+
+                                                                7
+
+
diff --git a/winsup/bz2lib/bzip2.c b/winsup/bz2lib/bzip2.c
new file mode 100644
index 000000000..56adfdcbc
--- /dev/null
+++ b/winsup/bz2lib/bzip2.c
@@ -0,0 +1,2044 @@
+
+/*-----------------------------------------------------------*/
+/*--- A block-sorting, lossless compressor        bzip2.c ---*/
+/*-----------------------------------------------------------*/
+
+/*--
+  This file is a part of bzip2 and/or libbzip2, a program and
+  library for lossless, block-sorting data compression.
+
+  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+  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. 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.
+
+  3. Altered source versions must be plainly marked as such, and must
+     not be misrepresented as being the original software.
+
+  4. 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.
+
+  Julian Seward, Cambridge, UK.
+  jseward@acm.org
+  bzip2/libbzip2 version 1.0 of 21 March 2000
+
+  This program is based on (at least) the work of:
+     Mike Burrows
+     David Wheeler
+     Peter Fenwick
+     Alistair Moffat
+     Radford Neal
+     Ian H. Witten
+     Robert Sedgewick
+     Jon L. Bentley
+
+  For more information on these sources, see the manual.
+--*/
+
+
+/*----------------------------------------------------*/
+/*--- IMPORTANT                                    ---*/
+/*----------------------------------------------------*/
+
+/*--
+   WARNING:
+      This program and library (attempts to) compress data by 
+      performing several non-trivial transformations on it.  
+      Unless you are 100% familiar with *all* the algorithms 
+      contained herein, and with the consequences of modifying them, 
+      you should NOT meddle with the compression or decompression 
+      machinery.  Incorrect changes can and very likely *will* 
+      lead to disasterous loss of data.
+
+   DISCLAIMER:
+      I TAKE NO RESPONSIBILITY FOR ANY LOSS OF DATA ARISING FROM THE
+      USE OF THIS PROGRAM, HOWSOEVER CAUSED.
+
+      Every compression of a file implies an assumption that the
+      compressed file can be decompressed to reproduce the original.
+      Great efforts in design, coding and testing have been made to
+      ensure that this program works correctly.  However, the
+      complexity of the algorithms, and, in particular, the presence
+      of various special cases in the code which occur with very low
+      but non-zero probability make it impossible to rule out the
+      possibility of bugs remaining in the program.  DO NOT COMPRESS
+      ANY DATA WITH THIS PROGRAM AND/OR LIBRARY UNLESS YOU ARE PREPARED 
+      TO ACCEPT THE POSSIBILITY, HOWEVER SMALL, THAT THE DATA WILL 
+      NOT BE RECOVERABLE.
+
+      That is not to say this program is inherently unreliable.
+      Indeed, I very much hope the opposite is true.  bzip2/libbzip2
+      has been carefully constructed and extensively tested.
+
+   PATENTS:
+      To the best of my knowledge, bzip2/libbzip2 does not use any 
+      patented algorithms.  However, I do not have the resources 
+      available to carry out a full patent search.  Therefore I cannot 
+      give any guarantee of the above statement.
+--*/
+
+
+
+/*----------------------------------------------------*/
+/*--- and now for something much more pleasant :-) ---*/
+/*----------------------------------------------------*/
+
+/*---------------------------------------------*/
+/*--
+  Place a 1 beside your platform, and 0 elsewhere.
+--*/
+
+/*--
+  Generic 32-bit Unix.
+  Also works on 64-bit Unix boxes.
+--*/
+#define BZ_UNIX      1
+
+/*--
+  Win32, as seen by Jacob Navia's excellent
+  port of (Chris Fraser & David Hanson)'s excellent
+  lcc compiler.
+--*/
+#define BZ_LCCWIN32  0
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+#undef  BZ_LCCWIN32
+#define BZ_LCCWIN32 1
+#undef  BZ_UNIX
+#define BZ_UNIX 0
+#endif
+
+
+/*---------------------------------------------*/
+/*--
+  Some stuff for all platforms.
+--*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <math.h>
+#include <errno.h>
+#include <ctype.h>
+#include "bzlib.h"
+
+#define ERROR_IF_EOF(i)       { if ((i) == EOF)  ioError(); }
+#define ERROR_IF_NOT_ZERO(i)  { if ((i) != 0)    ioError(); }
+#define ERROR_IF_MINUS_ONE(i) { if ((i) == (-1)) ioError(); }
+
+
+/*---------------------------------------------*/
+/*--
+   Platform-specific stuff.
+--*/
+
+#if BZ_UNIX
+#   include <sys/types.h>
+#   include <utime.h>
+#   include <unistd.h>
+#   include <sys/stat.h>
+#   include <sys/times.h>
+
+#   define PATH_SEP    '/'
+#   define MY_LSTAT    lstat
+#   define MY_S_IFREG  S_ISREG
+#   define MY_STAT     stat
+
+#   define APPEND_FILESPEC(root, name) \
+      root=snocString((root), (name))
+
+#   define APPEND_FLAG(root, name) \
+      root=snocString((root), (name))
+
+#   define SET_BINARY_MODE(fd) /**/
+
+#   ifdef __GNUC__
+#      define NORETURN __attribute__ ((noreturn))
+#   else
+#      define NORETURN /**/
+#   endif
+#   ifdef __DJGPP__
+#     include <io.h>
+#     include <fcntl.h>
+#     undef MY_LSTAT
+#     define MY_LSTAT stat
+#     undef SET_BINARY_MODE
+#     define SET_BINARY_MODE(fd)                        \
+        do {                                            \
+           int retVal = setmode ( fileno ( fd ),        \
+                                 O_BINARY );            \
+           ERROR_IF_MINUS_ONE ( retVal );               \
+        } while ( 0 )
+#   endif
+#   ifdef __CYGWIN__
+#     include <io.h>
+#     include <fcntl.h>
+#     undef SET_BINARY_MODE
+#     define SET_BINARY_MODE(fd)                        \
+        do {                                            \
+           int retVal = setmode ( fileno ( fd ),        \
+                                 O_BINARY );            \
+           ERROR_IF_MINUS_ONE ( retVal );               \
+        } while ( 0 )
+#   endif
+#endif
+
+
+
+#if BZ_LCCWIN32
+#   include <io.h>
+#   include <fcntl.h>
+#   include <sys\stat.h>
+
+#   define NORETURN       /**/
+#   define PATH_SEP       '\\'
+#   define MY_LSTAT       _stat
+#   define MY_STAT        _stat
+#   define MY_S_IFREG(x)  ((x) & _S_IFREG)
+
+#   define APPEND_FLAG(root, name) \
+      root=snocString((root), (name))
+
+#   if 0
+   /*-- lcc-win32 seems to expand wildcards itself --*/
+#   define APPEND_FILESPEC(root, spec)                \
+      do {                                            \
+         if ((spec)[0] == '-') {                      \
+            root = snocString((root), (spec));        \
+         } else {                                     \
+            struct _finddata_t c_file;                \
+            long hFile;                               \
+            hFile = _findfirst((spec), &c_file);      \
+            if ( hFile == -1L ) {                     \
+               root = snocString ((root), (spec));    \
+            } else {                                  \
+               int anInt = 0;                         \
+               while ( anInt == 0 ) {                 \
+                  root = snocString((root),           \
+                            &c_file.name[0]);         \
+                  anInt = _findnext(hFile, &c_file);  \
+               }                                      \
+            }                                         \
+         }                                            \
+      } while ( 0 )
+#   else
+#   define APPEND_FILESPEC(root, name)                \
+      root = snocString ((root), (name))
+#   endif
+
+#   define SET_BINARY_MODE(fd)                        \
+      do {                                            \
+         int retVal = setmode ( fileno ( fd ),        \
+                               O_BINARY );            \
+         ERROR_IF_MINUS_ONE ( retVal );               \
+      } while ( 0 )
+
+#endif
+
+
+/*---------------------------------------------*/
+/*--
+  Some more stuff for all platforms :-)
+--*/
+
+typedef char            Char;
+typedef unsigned char   Bool;
+typedef unsigned char   UChar;
+typedef int             Int32;
+typedef unsigned int    UInt32;
+typedef short           Int16;
+typedef unsigned short  UInt16;
+                                       
+#define True  ((Bool)1)
+#define False ((Bool)0)
+
+/*--
+  IntNative is your platform's `native' int size.
+  Only here to avoid probs with 64-bit platforms.
+--*/
+typedef int IntNative;
+
+
+/*---------------------------------------------------*/
+/*--- Misc (file handling) data decls             ---*/
+/*---------------------------------------------------*/
+
+Int32   verbosity;
+Bool    keepInputFiles, smallMode, deleteOutputOnInterrupt;
+Bool    forceOverwrite, testFailsExist, unzFailsExist, noisy;
+Int32   numFileNames, numFilesProcessed, blockSize100k;
+Int32   exitValue;
+
+/*-- source modes; F==file, I==stdin, O==stdout --*/
+#define SM_I2O           1
+#define SM_F2O           2
+#define SM_F2F           3
+
+/*-- operation modes --*/
+#define OM_Z             1
+#define OM_UNZ           2
+#define OM_TEST          3
+
+Int32   opMode;
+Int32   srcMode;
+
+#define FILE_NAME_LEN 1034
+
+Int32   longestFileName;
+Char    inName [FILE_NAME_LEN];
+Char    outName[FILE_NAME_LEN];
+Char    tmpName[FILE_NAME_LEN];
+Char    *progName;
+Char    progNameReally[FILE_NAME_LEN];
+FILE    *outputHandleJustInCase;
+Int32   workFactor;
+
+static void    panic                 ( Char* )   NORETURN;
+static void    ioError               ( void )    NORETURN;
+static void    outOfMemory           ( void )    NORETURN;
+static void    configError           ( void )    NORETURN;
+static void    crcError              ( void )    NORETURN;
+static void    cleanUpAndFail        ( Int32 )   NORETURN;
+static void    compressedStreamEOF   ( void )    NORETURN;
+
+static void    copyFileName ( Char*, Char* );
+static void*   myMalloc     ( Int32 );
+
+
+
+/*---------------------------------------------------*/
+/*--- An implementation of 64-bit ints.  Sigh.    ---*/
+/*--- Roll on widespread deployment of ANSI C9X ! ---*/
+/*---------------------------------------------------*/
+
+typedef
+   struct { UChar b[8]; } 
+   UInt64;
+
+static
+void uInt64_from_UInt32s ( UInt64* n, UInt32 lo32, UInt32 hi32 )
+{
+   n->b[7] = (UChar)((hi32 >> 24) & 0xFF);
+   n->b[6] = (UChar)((hi32 >> 16) & 0xFF);
+   n->b[5] = (UChar)((hi32 >> 8)  & 0xFF);
+   n->b[4] = (UChar) (hi32        & 0xFF);
+   n->b[3] = (UChar)((lo32 >> 24) & 0xFF);
+   n->b[2] = (UChar)((lo32 >> 16) & 0xFF);
+   n->b[1] = (UChar)((lo32 >> 8)  & 0xFF);
+   n->b[0] = (UChar) (lo32        & 0xFF);
+}
+
+static
+double uInt64_to_double ( UInt64* n )
+{
+   Int32  i;
+   double base = 1.0;
+   double sum  = 0.0;
+   for (i = 0; i < 8; i++) {
+      sum  += base * (double)(n->b[i]);
+      base *= 256.0;
+   }
+   return sum;
+}
+
+static
+void uInt64_add ( UInt64* src, UInt64* dst )
+{
+   Int32 i;
+   Int32 carry = 0;
+   for (i = 0; i < 8; i++) {
+      carry += ( ((Int32)src->b[i]) + ((Int32)dst->b[i]) );
+      dst->b[i] = (UChar)(carry & 0xFF);
+      carry >>= 8;
+   }
+}
+
+static
+void uInt64_sub ( UInt64* src, UInt64* dst )
+{
+   Int32 t, i;
+   Int32 borrow = 0;
+   for (i = 0; i < 8; i++) {
+      t = ((Int32)dst->b[i]) - ((Int32)src->b[i]) - borrow;
+      if (t < 0) {
+         dst->b[i] = (UChar)(t + 256);
+         borrow = 1;
+      } else {
+         dst->b[i] = (UChar)t;
+         borrow = 0;
+      }
+   }
+}
+
+static
+void uInt64_mul ( UInt64* a, UInt64* b, UInt64* r_hi, UInt64* r_lo )
+{
+   UChar sum[16];
+   Int32 ia, ib, carry;
+   for (ia = 0; ia < 16; ia++) sum[ia] = 0;
+   for (ia = 0; ia < 8; ia++) {
+      carry = 0;
+      for (ib = 0; ib < 8; ib++) {
+         carry += ( ((Int32)sum[ia+ib]) 
+                    + ((Int32)a->b[ia]) * ((Int32)b->b[ib]) );
+         sum[ia+ib] = (UChar)(carry & 0xFF);
+         carry >>= 8;
+      }
+      sum[ia+8] = (UChar)(carry & 0xFF);
+      if ((carry >>= 8) != 0) panic ( "uInt64_mul" );
+   }
+
+   for (ia = 0; ia < 8; ia++) r_hi->b[ia] = sum[ia+8];
+   for (ia = 0; ia < 8; ia++) r_lo->b[ia] = sum[ia];
+}
+
+
+static
+void uInt64_shr1 ( UInt64* n )
+{
+   Int32 i;
+   for (i = 0; i < 8; i++) {
+      n->b[i] >>= 1;
+      if (i < 7 && (n->b[i+1] & 1)) n->b[i] |= 0x80;
+   }
+}
+
+static
+void uInt64_shl1 ( UInt64* n )
+{
+   Int32 i;
+   for (i = 7; i >= 0; i--) {
+      n->b[i] <<= 1;
+      if (i > 0 && (n->b[i-1] & 0x80)) n->b[i]++;
+   }
+}
+
+static
+Bool uInt64_isZero ( UInt64* n )
+{
+   Int32 i;
+   for (i = 0; i < 8; i++)
+      if (n->b[i] != 0) return 0;
+   return 1;
+}
+
+static
+Int32 uInt64_qrm10 ( UInt64* n )
+{
+   /* Divide *n by 10, and return the remainder.  Long division
+      is difficult, so we cheat and instead multiply by
+      0xCCCC CCCC CCCC CCCD, which is 0.8 (viz, 0.1 << 3).
+   */
+   Int32  i;
+   UInt64 tmp1, tmp2, n_orig, zero_point_eight;
+
+   zero_point_eight.b[1] = zero_point_eight.b[2] = 
+   zero_point_eight.b[3] = zero_point_eight.b[4] = 
+   zero_point_eight.b[5] = zero_point_eight.b[6] = 
+   zero_point_eight.b[7] = 0xCC;
+   zero_point_eight.b[0] = 0xCD;
+
+   n_orig = *n;
+
+   /* divide n by 10, 
+      by multiplying by 0.8 and then shifting right 3 times */
+   uInt64_mul ( n, &zero_point_eight, &tmp1, &tmp2 );
+   uInt64_shr1(&tmp1); uInt64_shr1(&tmp1); uInt64_shr1(&tmp1); 
+   *n = tmp1;
+   
+   /* tmp1 = 8*n, tmp2 = 2*n */
+   uInt64_shl1(&tmp1); uInt64_shl1(&tmp1); uInt64_shl1(&tmp1);
+   tmp2 = *n; uInt64_shl1(&tmp2);
+
+   /* tmp1 = 10*n */
+   uInt64_add ( &tmp2, &tmp1 );
+
+   /* n_orig = n_orig - 10*n */
+   uInt64_sub ( &tmp1, &n_orig );
+
+   /* n_orig should now hold quotient, in range 0 .. 9 */
+   for (i = 7; i >= 1; i--) 
+      if (n_orig.b[i] != 0) panic ( "uInt64_qrm10(1)" );
+   if (n_orig.b[0] > 9)
+      panic ( "uInt64_qrm10(2)" );
+
+   return (int)n_orig.b[0];
+}
+
+/* ... and the Whole Entire Point of all this UInt64 stuff is
+   so that we can supply the following function.
+*/
+static
+void uInt64_toAscii ( char* outbuf, UInt64* n )
+{
+   Int32  i, q;
+   UChar  buf[32];
+   Int32  nBuf   = 0;
+   UInt64 n_copy = *n;
+   do {
+      q = uInt64_qrm10 ( &n_copy );
+      buf[nBuf] = q + '0';
+      nBuf++;
+   } while (!uInt64_isZero(&n_copy));
+   outbuf[nBuf] = 0;
+   for (i = 0; i < nBuf; i++) outbuf[i] = buf[nBuf-i-1];
+}
+
+
+/*---------------------------------------------------*/
+/*--- Processing of complete files and streams    ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------*/
+static 
+Bool myfeof ( FILE* f )
+{
+   Int32 c = fgetc ( f );
+   if (c == EOF) return True;
+   ungetc ( c, f );
+   return False;
+}
+
+
+/*---------------------------------------------*/
+static 
+void compressStream ( FILE *stream, FILE *zStream )
+{
+   BZFILE* bzf = NULL;
+   UChar   ibuf[5000];
+   Int32   nIbuf;
+   UInt32  nbytes_in_lo32, nbytes_in_hi32;
+   UInt32  nbytes_out_lo32, nbytes_out_hi32;
+   Int32   bzerr, bzerr_dummy, ret;
+
+   SET_BINARY_MODE(stream);
+   SET_BINARY_MODE(zStream);
+
+   if (ferror(stream)) goto errhandler_io;
+   if (ferror(zStream)) goto errhandler_io;
+
+   bzf = BZ2_bzWriteOpen ( &bzerr, zStream, 
+                           blockSize100k, verbosity, workFactor );   
+   if (bzerr != BZ_OK) goto errhandler;
+
+   if (verbosity >= 2) fprintf ( stderr, "\n" );
+
+   while (True) {
+
+      if (myfeof(stream)) break;
+      nIbuf = fread ( ibuf, sizeof(UChar), 5000, stream );
+      if (ferror(stream)) goto errhandler_io;
+      if (nIbuf > 0) BZ2_bzWrite ( &bzerr, bzf, (void*)ibuf, nIbuf );
+      if (bzerr != BZ_OK) goto errhandler;
+
+   }
+
+   BZ2_bzWriteClose64 ( &bzerr, bzf, 0, 
+                        &nbytes_in_lo32, &nbytes_in_hi32,
+                        &nbytes_out_lo32, &nbytes_out_hi32 );
+   if (bzerr != BZ_OK) goto errhandler;
+
+   if (ferror(zStream)) goto errhandler_io;
+   ret = fflush ( zStream );
+   if (ret == EOF) goto errhandler_io;
+   if (zStream != stdout) {
+      ret = fclose ( zStream );
+      if (ret == EOF) goto errhandler_io;
+   }
+   if (ferror(stream)) goto errhandler_io;
+   ret = fclose ( stream );
+   if (ret == EOF) goto errhandler_io;
+
+   if (nbytes_in_lo32 == 0 && nbytes_in_hi32 == 0) 
+      nbytes_in_lo32 = 1;
+
+   if (verbosity >= 1) {
+      Char   buf_nin[32], buf_nout[32];
+      UInt64 nbytes_in,   nbytes_out;
+      double nbytes_in_d, nbytes_out_d;
+      uInt64_from_UInt32s ( &nbytes_in, 
+                            nbytes_in_lo32, nbytes_in_hi32 );
+      uInt64_from_UInt32s ( &nbytes_out, 
+                            nbytes_out_lo32, nbytes_out_hi32 );
+      nbytes_in_d  = uInt64_to_double ( &nbytes_in );
+      nbytes_out_d = uInt64_to_double ( &nbytes_out );
+      uInt64_toAscii ( buf_nin, &nbytes_in );
+      uInt64_toAscii ( buf_nout, &nbytes_out );
+      fprintf ( stderr, "%6.3f:1, %6.3f bits/byte, "
+                        "%5.2f%% saved, %s in, %s out.\n",
+                nbytes_in_d / nbytes_out_d,
+                (8.0 * nbytes_out_d) / nbytes_in_d,
+                100.0 * (1.0 - nbytes_out_d / nbytes_in_d),
+                buf_nin,
+                buf_nout
+              );
+   }
+
+   return;
+
+   errhandler:
+   BZ2_bzWriteClose64 ( &bzerr_dummy, bzf, 1, 
+                        &nbytes_in_lo32, &nbytes_in_hi32,
+                        &nbytes_out_lo32, &nbytes_out_hi32 );
+   switch (bzerr) {
+      case BZ_CONFIG_ERROR:
+         configError(); break;
+      case BZ_MEM_ERROR:
+         outOfMemory (); break;
+      case BZ_IO_ERROR:
+         errhandler_io:
+         ioError(); break;
+      default:
+         panic ( "compress:unexpected error" );
+   }
+
+   panic ( "compress:end" );
+   /*notreached*/
+}
+
+
+
+/*---------------------------------------------*/
+static 
+Bool uncompressStream ( FILE *zStream, FILE *stream )
+{
+   BZFILE* bzf = NULL;
+   Int32   bzerr, bzerr_dummy, ret, nread, streamNo, i;
+   UChar   obuf[5000];
+   UChar   unused[BZ_MAX_UNUSED];
+   Int32   nUnused;
+   UChar*  unusedTmp;
+
+   nUnused = 0;
+   streamNo = 0;
+
+   SET_BINARY_MODE(stream);
+   SET_BINARY_MODE(zStream);
+
+   if (ferror(stream)) goto errhandler_io;
+   if (ferror(zStream)) goto errhandler_io;
+
+   while (True) {
+
+      bzf = BZ2_bzReadOpen ( 
+               &bzerr, zStream, verbosity, 
+               (int)smallMode, unused, nUnused
+            );
+      if (bzf == NULL || bzerr != BZ_OK) goto errhandler;
+      streamNo++;
+
+      while (bzerr == BZ_OK) {
+         nread = BZ2_bzRead ( &bzerr, bzf, obuf, 5000 );
+         if (bzerr == BZ_DATA_ERROR_MAGIC) goto errhandler;
+         if ((bzerr == BZ_OK || bzerr == BZ_STREAM_END) && nread > 0)
+            fwrite ( obuf, sizeof(UChar), nread, stream );
+         if (ferror(stream)) goto errhandler_io;
+      }
+      if (bzerr != BZ_STREAM_END) goto errhandler;
+
+      BZ2_bzReadGetUnused ( &bzerr, bzf, (void**)(&unusedTmp), &nUnused );
+      if (bzerr != BZ_OK) panic ( "decompress:bzReadGetUnused" );
+
+      for (i = 0; i < nUnused; i++) unused[i] = unusedTmp[i];
+
+      BZ2_bzReadClose ( &bzerr, bzf );
+      if (bzerr != BZ_OK) panic ( "decompress:bzReadGetUnused" );
+
+      if (nUnused == 0 && myfeof(zStream)) break;
+
+   }
+
+   if (ferror(zStream)) goto errhandler_io;
+   ret = fclose ( zStream );
+   if (ret == EOF) goto errhandler_io;
+
+   if (ferror(stream)) goto errhandler_io;
+   ret = fflush ( stream );
+   if (ret != 0) goto errhandler_io;
+   if (stream != stdout) {
+      ret = fclose ( stream );
+      if (ret == EOF) goto errhandler_io;
+   }
+   if (verbosity >= 2) fprintf ( stderr, "\n    " );
+   return True;
+
+   errhandler:
+   BZ2_bzReadClose ( &bzerr_dummy, bzf );
+   switch (bzerr) {
+      case BZ_CONFIG_ERROR:
+         configError(); break;
+      case BZ_IO_ERROR:
+         errhandler_io:
+         ioError(); break;
+      case BZ_DATA_ERROR:
+         crcError();
+      case BZ_MEM_ERROR:
+         outOfMemory();
+      case BZ_UNEXPECTED_EOF:
+         compressedStreamEOF();
+      case BZ_DATA_ERROR_MAGIC:
+         if (zStream != stdin) fclose(zStream);
+         if (stream != stdout) fclose(stream);
+         if (streamNo == 1) {
+            return False;
+         } else {
+            if (noisy)
+            fprintf ( stderr, 
+                      "\n%s: %s: trailing garbage after EOF ignored\n",
+                      progName, inName );
+            return True;       
+         }
+      default:
+         panic ( "decompress:unexpected error" );
+   }
+
+   panic ( "decompress:end" );
+   return True; /*notreached*/
+}
+
+
+/*---------------------------------------------*/
+static 
+Bool testStream ( FILE *zStream )
+{
+   BZFILE* bzf = NULL;
+   Int32   bzerr, bzerr_dummy, ret, nread, streamNo, i;
+   UChar   obuf[5000];
+   UChar   unused[BZ_MAX_UNUSED];
+   Int32   nUnused;
+   UChar*  unusedTmp;
+
+   nUnused = 0;
+   streamNo = 0;
+
+   SET_BINARY_MODE(zStream);
+   if (ferror(zStream)) goto errhandler_io;
+
+   while (True) {
+
+      bzf = BZ2_bzReadOpen ( 
+               &bzerr, zStream, verbosity, 
+               (int)smallMode, unused, nUnused
+            );
+      if (bzf == NULL || bzerr != BZ_OK) goto errhandler;
+      streamNo++;
+
+      while (bzerr == BZ_OK) {
+         nread = BZ2_bzRead ( &bzerr, bzf, obuf, 5000 );
+         if (bzerr == BZ_DATA_ERROR_MAGIC) goto errhandler;
+      }
+      if (bzerr != BZ_STREAM_END) goto errhandler;
+
+      BZ2_bzReadGetUnused ( &bzerr, bzf, (void**)(&unusedTmp), &nUnused );
+      if (bzerr != BZ_OK) panic ( "test:bzReadGetUnused" );
+
+      for (i = 0; i < nUnused; i++) unused[i] = unusedTmp[i];
+
+      BZ2_bzReadClose ( &bzerr, bzf );
+      if (bzerr != BZ_OK) panic ( "test:bzReadGetUnused" );
+      if (nUnused == 0 && myfeof(zStream)) break;
+
+   }
+
+   if (ferror(zStream)) goto errhandler_io;
+   ret = fclose ( zStream );
+   if (ret == EOF) goto errhandler_io;
+
+   if (verbosity >= 2) fprintf ( stderr, "\n    " );
+   return True;
+
+   errhandler:
+   BZ2_bzReadClose ( &bzerr_dummy, bzf );
+   if (verbosity == 0) 
+      fprintf ( stderr, "%s: %s: ", progName, inName );
+   switch (bzerr) {
+      case BZ_CONFIG_ERROR:
+         configError(); break;
+      case BZ_IO_ERROR:
+         errhandler_io:
+         ioError(); break;
+      case BZ_DATA_ERROR:
+         fprintf ( stderr,
+                   "data integrity (CRC) error in data\n" );
+         return False;
+      case BZ_MEM_ERROR:
+         outOfMemory();
+      case BZ_UNEXPECTED_EOF:
+         fprintf ( stderr,
+                   "file ends unexpectedly\n" );
+         return False;
+      case BZ_DATA_ERROR_MAGIC:
+         if (zStream != stdin) fclose(zStream);
+         if (streamNo == 1) {
+          fprintf ( stderr, 
+                    "bad magic number (file not created by bzip2)\n" );
+            return False;
+         } else {
+            if (noisy)
+            fprintf ( stderr, 
+                      "trailing garbage after EOF ignored\n" );
+            return True;       
+         }
+      default:
+         panic ( "test:unexpected error" );
+   }
+
+   panic ( "test:end" );
+   return True; /*notreached*/
+}
+
+
+/*---------------------------------------------------*/
+/*--- Error [non-] handling grunge                ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------*/
+static
+void setExit ( Int32 v )
+{
+   if (v > exitValue) exitValue = v;
+}
+
+
+/*---------------------------------------------*/
+static 
+void cadvise ( void )
+{
+   if (noisy)
+   fprintf (
+      stderr,
+      "\nIt is possible that the compressed file(s) have become corrupted.\n"
+        "You can use the -tvv option to test integrity of such files.\n\n"
+        "You can use the `bzip2recover' program to *attempt* to recover\n"
+        "data from undamaged sections of corrupted files.\n\n"
+    );
+}
+
+
+/*---------------------------------------------*/
+static 
+void showFileNames ( void )
+{
+   if (noisy)
+   fprintf (
+      stderr,
+      "\tInput file = %s, output file = %s\n",
+      inName, outName 
+   );
+}
+
+
+/*---------------------------------------------*/
+static 
+void cleanUpAndFail ( Int32 ec )
+{
+   IntNative retVal;
+
+   if ( srcMode == SM_F2F 
+        && opMode != OM_TEST
+        && deleteOutputOnInterrupt ) {
+      if (noisy)
+      fprintf ( stderr, "%s: Deleting output file %s, if it exists.\n",
+                progName, outName );
+      if (outputHandleJustInCase != NULL)
+         fclose ( outputHandleJustInCase );
+      retVal = remove ( outName );
+      if (retVal != 0)
+         fprintf ( stderr,
+                   "%s: WARNING: deletion of output file (apparently) failed.\n",
+                   progName );
+   }
+   if (noisy && numFileNames > 0 && numFilesProcessed < numFileNames) {
+      fprintf ( stderr, 
+                "%s: WARNING: some files have not been processed:\n"
+                "\t%d specified on command line, %d not processed yet.\n\n",
+                progName, numFileNames, 
+                          numFileNames - numFilesProcessed );
+   }
+   setExit(ec);
+   exit(exitValue);
+}
+
+
+/*---------------------------------------------*/
+static 
+void panic ( Char* s )
+{
+   fprintf ( stderr,
+             "\n%s: PANIC -- internal consistency error:\n"
+             "\t%s\n"
+             "\tThis is a BUG.  Please report it to me at:\n"
+             "\tjseward@acm.org\n",
+             progName, s );
+   showFileNames();
+   cleanUpAndFail( 3 );
+}
+
+
+/*---------------------------------------------*/
+static 
+void crcError ( void )
+{
+   fprintf ( stderr,
+             "\n%s: Data integrity error when decompressing.\n",
+             progName );
+   showFileNames();
+   cadvise();
+   cleanUpAndFail( 2 );
+}
+
+
+/*---------------------------------------------*/
+static 
+void compressedStreamEOF ( void )
+{
+   fprintf ( stderr,
+             "\n%s: Compressed file ends unexpectedly;\n\t"
+             "perhaps it is corrupted?  *Possible* reason follows.\n",
+             progName );
+   perror ( progName );
+   showFileNames();
+   cadvise();
+   cleanUpAndFail( 2 );
+}
+
+
+/*---------------------------------------------*/
+static 
+void ioError ( void )
+{
+   fprintf ( stderr,
+             "\n%s: I/O or other error, bailing out.  "
+             "Possible reason follows.\n",
+             progName );
+   perror ( progName );
+   showFileNames();
+   cleanUpAndFail( 1 );
+}
+
+
+/*---------------------------------------------*/
+static 
+void mySignalCatcher ( IntNative n )
+{
+   fprintf ( stderr,
+             "\n%s: Control-C or similar caught, quitting.\n",
+             progName );
+   cleanUpAndFail(1);
+}
+
+
+/*---------------------------------------------*/
+static 
+void mySIGSEGVorSIGBUScatcher ( IntNative n )
+{
+   if (opMode == OM_Z)
+      fprintf ( 
+      stderr,
+      "\n%s: Caught a SIGSEGV or SIGBUS whilst compressing.\n"
+      "\n"
+      "   Possible causes are (most likely first):\n"
+      "   (1) This computer has unreliable memory or cache hardware\n"
+      "       (a surprisingly common problem; try a different machine.)\n"
+      "   (2) A bug in the compiler used to create this executable\n"
+      "       (unlikely, if you didn't compile bzip2 yourself.)\n"
+      "   (3) A real bug in bzip2 -- I hope this should never be the case.\n"
+      "   The user's manual, Section 4.3, has more info on (1) and (2).\n"
+      "   \n"
+      "   If you suspect this is a bug in bzip2, or are unsure about (1)\n"
+      "   or (2), feel free to report it to me at: jseward@acm.org.\n"
+      "   Section 4.3 of the user's manual describes the info a useful\n"
+      "   bug report should have.  If the manual is available on your\n"
+      "   system, please try and read it before mailing me.  If you don't\n"
+      "   have the manual or can't be bothered to read it, mail me anyway.\n"
+      "\n",
+      progName );
+      else
+      fprintf ( 
+      stderr,
+      "\n%s: Caught a SIGSEGV or SIGBUS whilst decompressing.\n"
+      "\n"
+      "   Possible causes are (most likely first):\n"
+      "   (1) The compressed data is corrupted, and bzip2's usual checks\n"
+      "       failed to detect this.  Try bzip2 -tvv my_file.bz2.\n"
+      "   (2) This computer has unreliable memory or cache hardware\n"
+      "       (a surprisingly common problem; try a different machine.)\n"
+      "   (3) A bug in the compiler used to create this executable\n"
+      "       (unlikely, if you didn't compile bzip2 yourself.)\n"
+      "   (4) A real bug in bzip2 -- I hope this should never be the case.\n"
+      "   The user's manual, Section 4.3, has more info on (2) and (3).\n"
+      "   \n"
+      "   If you suspect this is a bug in bzip2, or are unsure about (2)\n"
+      "   or (3), feel free to report it to me at: jseward@acm.org.\n"
+      "   Section 4.3 of the user's manual describes the info a useful\n"
+      "   bug report should have.  If the manual is available on your\n"
+      "   system, please try and read it before mailing me.  If you don't\n"
+      "   have the manual or can't be bothered to read it, mail me anyway.\n"
+      "\n",
+      progName );
+
+   showFileNames();
+   if (opMode == OM_Z)
+      cleanUpAndFail( 3 ); else
+      { cadvise(); cleanUpAndFail( 2 ); }
+}
+
+
+/*---------------------------------------------*/
+static 
+void outOfMemory ( void )
+{
+   fprintf ( stderr,
+             "\n%s: couldn't allocate enough memory\n",
+             progName );
+   showFileNames();
+   cleanUpAndFail(1);
+}
+
+
+/*---------------------------------------------*/
+static 
+void configError ( void )
+{
+   fprintf ( stderr,
+             "bzip2: I'm not configured correctly for this platform!\n"
+             "\tI require Int32, Int16 and Char to have sizes\n"
+             "\tof 4, 2 and 1 bytes to run properly, and they don't.\n"
+             "\tProbably you can fix this by defining them correctly,\n"
+             "\tand recompiling.  Bye!\n" );
+   setExit(3);
+   exit(exitValue);
+}
+
+
+/*---------------------------------------------------*/
+/*--- The main driver machinery                   ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------*/
+static 
+void pad ( Char *s )
+{
+   Int32 i;
+   if ( (Int32)strlen(s) >= longestFileName ) return;
+   for (i = 1; i <= longestFileName - (Int32)strlen(s); i++)
+      fprintf ( stderr, " " );
+}
+
+
+/*---------------------------------------------*/
+static 
+void copyFileName ( Char* to, Char* from ) 
+{
+   if ( strlen(from) > FILE_NAME_LEN-10 )  {
+      fprintf (
+         stderr,
+         "bzip2: file name\n`%s'\n"
+         "is suspiciously (more than %d chars) long.\n"
+         "Try using a reasonable file name instead.  Sorry! :-)\n",
+         from, FILE_NAME_LEN-10
+      );
+      setExit(1);
+      exit(exitValue);
+   }
+
+  strncpy(to,from,FILE_NAME_LEN-10);
+  to[FILE_NAME_LEN-10]='\0';
+}
+
+
+/*---------------------------------------------*/
+static 
+Bool fileExists ( Char* name )
+{
+   FILE *tmp   = fopen ( name, "rb" );
+   Bool exists = (tmp != NULL);
+   if (tmp != NULL) fclose ( tmp );
+   return exists;
+}
+
+
+/*---------------------------------------------*/
+/*--
+  if in doubt, return True
+--*/
+static 
+Bool notAStandardFile ( Char* name )
+{
+   IntNative      i;
+   struct MY_STAT statBuf;
+
+   i = MY_LSTAT ( name, &statBuf );
+   if (i != 0) return True;
+   if (MY_S_IFREG(statBuf.st_mode)) return False;
+   return True;
+}
+
+
+/*---------------------------------------------*/
+/*--
+  rac 11/21/98 see if file has hard links to it
+--*/
+static 
+Int32 countHardLinks ( Char* name )
+{  
+   IntNative      i;
+   struct MY_STAT statBuf;
+
+   i = MY_LSTAT ( name, &statBuf );
+   if (i != 0) return 0;
+   return (statBuf.st_nlink - 1);
+}
+
+
+/*---------------------------------------------*/
+static 
+void copyDatePermissionsAndOwner ( Char *srcName, Char *dstName )
+{
+#if BZ_UNIX
+   IntNative      retVal;
+   struct MY_STAT statBuf;
+   struct utimbuf uTimBuf;
+
+   retVal = MY_LSTAT ( srcName, &statBuf );
+   ERROR_IF_NOT_ZERO ( retVal );
+   uTimBuf.actime = statBuf.st_atime;
+   uTimBuf.modtime = statBuf.st_mtime;
+
+   retVal = chmod ( dstName, statBuf.st_mode );
+   ERROR_IF_NOT_ZERO ( retVal );
+
+   retVal = utime ( dstName, &uTimBuf );
+   ERROR_IF_NOT_ZERO ( retVal );
+
+   retVal = chown ( dstName, statBuf.st_uid, statBuf.st_gid );
+   /* chown() will in many cases return with EPERM, which can
+      be safely ignored.
+   */
+#endif
+}
+
+
+/*---------------------------------------------*/
+static 
+void setInterimPermissions ( Char *dstName )
+{
+#if BZ_UNIX
+   IntNative      retVal;
+   retVal = chmod ( dstName, S_IRUSR | S_IWUSR );
+   ERROR_IF_NOT_ZERO ( retVal );
+#endif
+}
+
+
+/*---------------------------------------------*/
+static 
+Bool containsDubiousChars ( Char* name )
+{
+   Bool cdc = False;
+   for (; *name != '\0'; name++)
+      if (*name == '?' || *name == '*') cdc = True;
+   return cdc;
+}
+
+
+/*---------------------------------------------*/
+#define BZ_N_SUFFIX_PAIRS 4
+
+Char* zSuffix[BZ_N_SUFFIX_PAIRS] 
+   = { ".bz2", ".bz", ".tbz2", ".tbz" };
+Char* unzSuffix[BZ_N_SUFFIX_PAIRS] 
+   = { "", "", ".tar", ".tar" };
+
+static 
+Bool hasSuffix ( Char* s, Char* suffix )
+{
+   Int32 ns = strlen(s);
+   Int32 nx = strlen(suffix);
+   if (ns < nx) return False;
+   if (strcmp(s + ns - nx, suffix) == 0) return True;
+   return False;
+}
+
+static 
+Bool mapSuffix ( Char* name, 
+                 Char* oldSuffix, Char* newSuffix )
+{
+   if (!hasSuffix(name,oldSuffix)) return False;
+   name[strlen(name)-strlen(oldSuffix)] = 0;
+   strcat ( name, newSuffix );
+   return True;
+}
+
+
+/*---------------------------------------------*/
+static 
+void compress ( Char *name )
+{
+   FILE  *inStr;
+   FILE  *outStr;
+   Int32 n, i;
+
+   deleteOutputOnInterrupt = False;
+
+   if (name == NULL && srcMode != SM_I2O)
+      panic ( "compress: bad modes\n" );
+
+   switch (srcMode) {
+      case SM_I2O: 
+         copyFileName ( inName, "(stdin)" );
+         copyFileName ( outName, "(stdout)" ); 
+         break;
+      case SM_F2F: 
+         copyFileName ( inName, name );
+         copyFileName ( outName, name );
+         strcat ( outName, ".bz2" ); 
+         break;
+      case SM_F2O: 
+         copyFileName ( inName, name );
+         copyFileName ( outName, "(stdout)" ); 
+         break;
+   }
+
+   if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
+      if (noisy)
+      fprintf ( stderr, "%s: There are no files matching `%s'.\n",
+                progName, inName );
+      setExit(1);
+      return;
+   }
+   if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
+      fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
+                progName, inName, strerror(errno) );
+      setExit(1);
+      return;
+   }
+   for (i = 0; i < BZ_N_SUFFIX_PAIRS; i++) {
+      if (hasSuffix(inName, zSuffix[i])) {
+         if (noisy)
+         fprintf ( stderr, 
+                   "%s: Input file %s already has %s suffix.\n",
+                   progName, inName, zSuffix[i] );
+         setExit(1);
+         return;
+      }
+   }
+   if ( srcMode == SM_F2F && !forceOverwrite && notAStandardFile ( inName )) {
+      if (noisy)
+      fprintf ( stderr, "%s: Input file %s is not a normal file.\n",
+                progName, inName );
+      setExit(1);
+      return;
+   }
+   if ( srcMode == SM_F2F && !forceOverwrite && fileExists ( outName ) ) {
+      fprintf ( stderr, "%s: Output file %s already exists.\n",
+                progName, outName );
+      setExit(1);
+      return;
+   }
+   if ( srcMode == SM_F2F && !forceOverwrite &&
+        (n=countHardLinks ( inName )) > 0) {
+      fprintf ( stderr, "%s: Input file %s has %d other link%s.\n",
+                progName, inName, n, n > 1 ? "s" : "" );
+      setExit(1);
+      return;
+   }
+
+   switch ( srcMode ) {
+
+      case SM_I2O:
+         inStr = stdin;
+         outStr = stdout;
+         if ( isatty ( fileno ( stdout ) ) ) {
+            fprintf ( stderr,
+                      "%s: I won't write compressed data to a terminal.\n",
+                      progName );
+            fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
+                              progName, progName );
+            setExit(1);
+            return;
+         };
+         break;
+
+      case SM_F2O:
+         inStr = fopen ( inName, "rb" );
+         outStr = stdout;
+         if ( isatty ( fileno ( stdout ) ) ) {
+            fprintf ( stderr,
+                      "%s: I won't write compressed data to a terminal.\n",
+                      progName );
+            fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
+                              progName, progName );
+            if ( inStr != NULL ) fclose ( inStr );
+            setExit(1);
+            return;
+         };
+         if ( inStr == NULL ) {
+            fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
+                      progName, inName, strerror(errno) );
+            setExit(1);
+            return;
+         };
+         break;
+
+      case SM_F2F:
+         inStr = fopen ( inName, "rb" );
+         outStr = fopen ( outName, "wb" );
+         if ( outStr == NULL) {
+            fprintf ( stderr, "%s: Can't create output file %s: %s.\n",
+                      progName, outName, strerror(errno) );
+            if ( inStr != NULL ) fclose ( inStr );
+            setExit(1);
+            return;
+         }
+         if ( inStr == NULL ) {
+            fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
+                      progName, inName, strerror(errno) );
+            if ( outStr != NULL ) fclose ( outStr );
+            setExit(1);
+            return;
+         };
+         setInterimPermissions ( outName );
+         break;
+
+      default:
+         panic ( "compress: bad srcMode" );
+         break;
+   }
+
+   if (verbosity >= 1) {
+      fprintf ( stderr,  "  %s: ", inName );
+      pad ( inName );
+      fflush ( stderr );
+   }
+
+   /*--- Now the input and output handles are sane.  Do the Biz. ---*/
+   outputHandleJustInCase = outStr;
+   deleteOutputOnInterrupt = True;
+   compressStream ( inStr, outStr );
+   outputHandleJustInCase = NULL;
+
+   /*--- If there was an I/O error, we won't get here. ---*/
+   if ( srcMode == SM_F2F ) {
+      copyDatePermissionsAndOwner ( inName, outName );
+      deleteOutputOnInterrupt = False;
+      if ( !keepInputFiles ) {
+         IntNative retVal = remove ( inName );
+         ERROR_IF_NOT_ZERO ( retVal );
+      }
+   }
+
+   deleteOutputOnInterrupt = False;
+}
+
+
+/*---------------------------------------------*/
+static 
+void uncompress ( Char *name )
+{
+   FILE  *inStr;
+   FILE  *outStr;
+   Int32 n, i;
+   Bool  magicNumberOK;
+   Bool  cantGuess;
+
+   deleteOutputOnInterrupt = False;
+
+   if (name == NULL && srcMode != SM_I2O)
+      panic ( "uncompress: bad modes\n" );
+
+   cantGuess = False;
+   switch (srcMode) {
+      case SM_I2O: 
+         copyFileName ( inName, "(stdin)" );
+         copyFileName ( outName, "(stdout)" ); 
+         break;
+      case SM_F2F: 
+         copyFileName ( inName, name );
+         copyFileName ( outName, name );
+         for (i = 0; i < BZ_N_SUFFIX_PAIRS; i++)
+            if (mapSuffix(outName,zSuffix[i],unzSuffix[i]))
+               goto zzz; 
+         cantGuess = True;
+         strcat ( outName, ".out" );
+         break;
+      case SM_F2O: 
+         copyFileName ( inName, name );
+         copyFileName ( outName, "(stdout)" ); 
+         break;
+   }
+
+   zzz:
+   if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
+      if (noisy)
+      fprintf ( stderr, "%s: There are no files matching `%s'.\n",
+                progName, inName );
+      setExit(1);
+      return;
+   }
+   if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
+      fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
+                progName, inName, strerror(errno) );
+      setExit(1);
+      return;
+   }
+   if ( srcMode == SM_F2F && !forceOverwrite && notAStandardFile ( inName )) {
+      if (noisy)
+      fprintf ( stderr, "%s: Input file %s is not a normal file.\n",
+                progName, inName );
+      setExit(1);
+      return;
+   }
+   if ( /* srcMode == SM_F2F implied && */ cantGuess ) {
+      if (noisy)
+      fprintf ( stderr, 
+                "%s: Can't guess original name for %s -- using %s\n",
+                progName, inName, outName );
+      /* just a warning, no return */
+   }   
+   if ( srcMode == SM_F2F && !forceOverwrite && fileExists ( outName ) ) {
+      fprintf ( stderr, "%s: Output file %s already exists.\n",
+                progName, outName );
+      setExit(1);
+      return;
+   }
+   if ( srcMode == SM_F2F && !forceOverwrite &&
+        (n=countHardLinks ( inName ) ) > 0) {
+      fprintf ( stderr, "%s: Input file %s has %d other link%s.\n",
+                progName, inName, n, n > 1 ? "s" : "" );
+      setExit(1);
+      return;
+   }
+
+   switch ( srcMode ) {
+
+      case SM_I2O:
+         inStr = stdin;
+         outStr = stdout;
+         if ( isatty ( fileno ( stdin ) ) ) {
+            fprintf ( stderr,
+                      "%s: I won't read compressed data from a terminal.\n",
+                      progName );
+            fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
+                              progName, progName );
+            setExit(1);
+            return;
+         };
+         break;
+
+      case SM_F2O:
+         inStr = fopen ( inName, "rb" );
+         outStr = stdout;
+         if ( inStr == NULL ) {
+            fprintf ( stderr, "%s: Can't open input file %s:%s.\n",
+                      progName, inName, strerror(errno) );
+            if ( inStr != NULL ) fclose ( inStr );
+            setExit(1);
+            return;
+         };
+         break;
+
+      case SM_F2F:
+         inStr = fopen ( inName, "rb" );
+         outStr = fopen ( outName, "wb" );
+         if ( outStr == NULL) {
+            fprintf ( stderr, "%s: Can't create output file %s: %s.\n",
+                      progName, outName, strerror(errno) );
+            if ( inStr != NULL ) fclose ( inStr );
+            setExit(1);
+            return;
+         }
+         if ( inStr == NULL ) {
+            fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
+                      progName, inName, strerror(errno) );
+            if ( outStr != NULL ) fclose ( outStr );
+            setExit(1);
+            return;
+         };
+         setInterimPermissions ( outName );
+         break;
+
+      default:
+         panic ( "uncompress: bad srcMode" );
+         break;
+   }
+
+   if (verbosity >= 1) {
+      fprintf ( stderr, "  %s: ", inName );
+      pad ( inName );
+      fflush ( stderr );
+   }
+
+   /*--- Now the input and output handles are sane.  Do the Biz. ---*/
+   outputHandleJustInCase = outStr;
+   deleteOutputOnInterrupt = True;
+   magicNumberOK = uncompressStream ( inStr, outStr );
+   outputHandleJustInCase = NULL;
+
+   /*--- If there was an I/O error, we won't get here. ---*/
+   if ( magicNumberOK ) {
+      if ( srcMode == SM_F2F ) {
+         copyDatePermissionsAndOwner ( inName, outName );
+         deleteOutputOnInterrupt = False;
+         if ( !keepInputFiles ) {
+            IntNative retVal = remove ( inName );
+            ERROR_IF_NOT_ZERO ( retVal );
+         }
+      }
+   } else {
+      unzFailsExist = True;
+      deleteOutputOnInterrupt = False;
+      if ( srcMode == SM_F2F ) {
+         IntNative retVal = remove ( outName );
+         ERROR_IF_NOT_ZERO ( retVal );
+      }
+   }
+   deleteOutputOnInterrupt = False;
+
+   if ( magicNumberOK ) {
+      if (verbosity >= 1)
+         fprintf ( stderr, "done\n" );
+   } else {
+      setExit(2);
+      if (verbosity >= 1)
+         fprintf ( stderr, "not a bzip2 file.\n" ); else
+         fprintf ( stderr,
+                   "%s: %s is not a bzip2 file.\n",
+                   progName, inName );
+   }
+
+}
+
+
+/*---------------------------------------------*/
+static 
+void testf ( Char *name )
+{
+   FILE *inStr;
+   Bool allOK;
+
+   deleteOutputOnInterrupt = False;
+
+   if (name == NULL && srcMode != SM_I2O)
+      panic ( "testf: bad modes\n" );
+
+   copyFileName ( outName, "(none)" );
+   switch (srcMode) {
+      case SM_I2O: copyFileName ( inName, "(stdin)" ); break;
+      case SM_F2F: copyFileName ( inName, name ); break;
+      case SM_F2O: copyFileName ( inName, name ); break;
+   }
+
+   if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
+      if (noisy)
+      fprintf ( stderr, "%s: There are no files matching `%s'.\n",
+                progName, inName );
+      setExit(1);
+      return;
+   }
+   if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
+      fprintf ( stderr, "%s: Can't open input %s: %s.\n",
+                progName, inName, strerror(errno) );
+      setExit(1);
+      return;
+   }
+
+   switch ( srcMode ) {
+
+      case SM_I2O:
+         if ( isatty ( fileno ( stdin ) ) ) {
+            fprintf ( stderr,
+                      "%s: I won't read compressed data from a terminal.\n",
+                      progName );
+            fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
+                              progName, progName );
+            setExit(1);
+            return;
+         };
+         inStr = stdin;
+         break;
+
+      case SM_F2O: case SM_F2F:
+         inStr = fopen ( inName, "rb" );
+         if ( inStr == NULL ) {
+            fprintf ( stderr, "%s: Can't open input file %s:%s.\n",
+                      progName, inName, strerror(errno) );
+            setExit(1);
+            return;
+         };
+         break;
+
+      default:
+         panic ( "testf: bad srcMode" );
+         break;
+   }
+
+   if (verbosity >= 1) {
+      fprintf ( stderr, "  %s: ", inName );
+      pad ( inName );
+      fflush ( stderr );
+   }
+
+   /*--- Now the input handle is sane.  Do the Biz. ---*/
+   allOK = testStream ( inStr );
+
+   if (allOK && verbosity >= 1) fprintf ( stderr, "ok\n" );
+   if (!allOK) testFailsExist = True;
+}
+
+
+/*---------------------------------------------*/
+static 
+void license ( void )
+{
+   fprintf ( stderr,
+
+    "bzip2, a block-sorting file compressor.  "
+    "Version %s.\n"
+    "   \n"
+    "   Copyright (C) 1996-2000 by Julian Seward.\n"
+    "   \n"
+    "   This program is free software; you can redistribute it and/or modify\n"
+    "   it under the terms set out in the LICENSE file, which is included\n"
+    "   in the bzip2-1.0 source distribution.\n"
+    "   \n"
+    "   This program is distributed in the hope that it will be useful,\n"
+    "   but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
+    "   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
+    "   LICENSE file for more details.\n"
+    "   \n",
+    BZ2_bzlibVersion()
+   );
+}
+
+
+/*---------------------------------------------*/
+static 
+void usage ( Char *fullProgName )
+{
+   fprintf (
+      stderr,
+      "bzip2, a block-sorting file compressor.  "
+      "Version %s.\n"
+      "\n   usage: %s [flags and input files in any order]\n"
+      "\n"
+      "   -h --help           print this message\n"
+      "   -d --decompress     force decompression\n"
+      "   -z --compress       force compression\n"
+      "   -k --keep           keep (don't delete) input files\n"
+      "   -f --force          overwrite existing output files\n"
+      "   -t --test           test compressed file integrity\n"
+      "   -c --stdout         output to standard out\n"
+      "   -q --quiet          suppress noncritical error messages\n"
+      "   -v --verbose        be verbose (a 2nd -v gives more)\n"
+      "   -L --license        display software version & license\n"
+      "   -V --version        display software version & license\n"
+      "   -s --small          use less memory (at most 2500k)\n"
+      "   -1 .. -9            set block size to 100k .. 900k\n"
+      "\n"
+      "   If invoked as `bzip2', default action is to compress.\n"
+      "              as `bunzip2',  default action is to decompress.\n"
+      "              as `bzcat', default action is to decompress to stdout.\n"
+      "\n"
+      "   If no file names are given, bzip2 compresses or decompresses\n"
+      "   from standard input to standard output.  You can combine\n"
+      "   short flags, so `-v -4' means the same as -v4 or -4v, &c.\n"
+#if BZ_UNIX
+      "\n"
+#endif
+      ,
+
+      BZ2_bzlibVersion(),
+      fullProgName
+   );
+}
+
+
+/*---------------------------------------------*/
+static 
+void redundant ( Char* flag )
+{
+   fprintf ( 
+      stderr, 
+      "%s: %s is redundant in versions 0.9.5 and above\n",
+      progName, flag );
+}
+
+
+/*---------------------------------------------*/
+/*--
+  All the garbage from here to main() is purely to
+  implement a linked list of command-line arguments,
+  into which main() copies argv[1 .. argc-1].
+
+  The purpose of this exercise is to facilitate 
+  the expansion of wildcard characters * and ? in 
+  filenames for OSs which don't know how to do it
+  themselves, like MSDOS, Windows 95 and NT.
+
+  The actual Dirty Work is done by the platform-
+  specific macro APPEND_FILESPEC.
+--*/
+
+typedef
+   struct zzzz {
+      Char        *name;
+      struct zzzz *link;
+   }
+   Cell;
+
+
+/*---------------------------------------------*/
+static 
+void *myMalloc ( Int32 n )
+{
+   void* p;
+
+   p = malloc ( (size_t)n );
+   if (p == NULL) outOfMemory ();
+   return p;
+}
+
+
+/*---------------------------------------------*/
+static 
+Cell *mkCell ( void )
+{
+   Cell *c;
+
+   c = (Cell*) myMalloc ( sizeof ( Cell ) );
+   c->name = NULL;
+   c->link = NULL;
+   return c;
+}
+
+
+/*---------------------------------------------*/
+static 
+Cell *snocString ( Cell *root, Char *name )
+{
+   if (root == NULL) {
+      Cell *tmp = mkCell();
+      tmp->name = (Char*) myMalloc ( 5 + strlen(name) );
+      strcpy ( tmp->name, name );
+      return tmp;
+   } else {
+      Cell *tmp = root;
+      while (tmp->link != NULL) tmp = tmp->link;
+      tmp->link = snocString ( tmp->link, name );
+      return root;
+   }
+}
+
+
+/*---------------------------------------------*/
+static 
+void addFlagsFromEnvVar ( Cell** argList, Char* varName ) 
+{
+   Int32 i, j, k;
+   Char *envbase, *p;
+
+   envbase = getenv(varName);
+   if (envbase != NULL) {
+      p = envbase;
+      i = 0;
+      while (True) {
+         if (p[i] == 0) break;
+         p += i;
+         i = 0;
+         while (isspace((Int32)(p[0]))) p++;
+         while (p[i] != 0 && !isspace((Int32)(p[i]))) i++;
+         if (i > 0) {
+            k = i; if (k > FILE_NAME_LEN-10) k = FILE_NAME_LEN-10;
+            for (j = 0; j < k; j++) tmpName[j] = p[j];
+            tmpName[k] = 0;
+            APPEND_FLAG(*argList, tmpName);
+         }
+      }
+   }
+}
+
+
+/*---------------------------------------------*/
+#define ISFLAG(s) (strcmp(aa->name, (s))==0)
+
+IntNative main ( IntNative argc, Char *argv[] )
+{
+   Int32  i, j;
+   Char   *tmp;
+   Cell   *argList;
+   Cell   *aa;
+   Bool   decode;
+
+   /*-- Be really really really paranoid :-) --*/
+   if (sizeof(Int32) != 4 || sizeof(UInt32) != 4  ||
+       sizeof(Int16) != 2 || sizeof(UInt16) != 2  ||
+       sizeof(Char)  != 1 || sizeof(UChar)  != 1)
+      configError();
+
+   /*-- Initialise --*/
+   outputHandleJustInCase  = NULL;
+   smallMode               = False;
+   keepInputFiles          = False;
+   forceOverwrite          = False;
+   noisy                   = True;
+   verbosity               = 0;
+   blockSize100k           = 9;
+   testFailsExist          = False;
+   unzFailsExist           = False;
+   numFileNames            = 0;
+   numFilesProcessed       = 0;
+   workFactor              = 30;
+   deleteOutputOnInterrupt = False;
+   exitValue               = 0;
+   i = j = 0; /* avoid bogus warning from egcs-1.1.X */
+
+   /*-- Set up signal handlers for mem access errors --*/
+   signal (SIGSEGV, mySIGSEGVorSIGBUScatcher);
+#if BZ_UNIX
+#ifndef __DJGPP__
+   signal (SIGBUS,  mySIGSEGVorSIGBUScatcher);
+#endif
+#endif
+
+   copyFileName ( inName,  "(none)" );
+   copyFileName ( outName, "(none)" );
+
+   copyFileName ( progNameReally, argv[0] );
+   progName = &progNameReally[0];
+   for (tmp = &progNameReally[0]; *tmp != '\0'; tmp++)
+      if (*tmp == PATH_SEP) progName = tmp + 1;
+
+
+   /*-- Copy flags from env var BZIP2, and 
+        expand filename wildcards in arg list.
+   --*/
+   argList = NULL;
+   addFlagsFromEnvVar ( &argList,  "BZIP2" );
+   addFlagsFromEnvVar ( &argList,  "BZIP" );
+   for (i = 1; i <= argc-1; i++)
+      APPEND_FILESPEC(argList, argv[i]);
+
+
+   /*-- Find the length of the longest filename --*/
+   longestFileName = 7;
+   numFileNames    = 0;
+   decode          = True;
+   for (aa = argList; aa != NULL; aa = aa->link) {
+      if (ISFLAG("--")) { decode = False; continue; }
+      if (aa->name[0] == '-' && decode) continue;
+      numFileNames++;
+      if (longestFileName < (Int32)strlen(aa->name) )
+         longestFileName = (Int32)strlen(aa->name);
+   }
+
+
+   /*-- Determine source modes; flag handling may change this too. --*/
+   if (numFileNames == 0)
+      srcMode = SM_I2O; else srcMode = SM_F2F;
+
+
+   /*-- Determine what to do (compress/uncompress/test/cat). --*/
+   /*-- Note that subsequent flag handling may change this. --*/
+   opMode = OM_Z;
+
+   if ( (strstr ( progName, "unzip" ) != 0) ||
+        (strstr ( progName, "UNZIP" ) != 0) )
+      opMode = OM_UNZ;
+
+   if ( (strstr ( progName, "z2cat" ) != 0) ||
+        (strstr ( progName, "Z2CAT" ) != 0) ||
+        (strstr ( progName, "zcat" ) != 0)  ||
+        (strstr ( progName, "ZCAT" ) != 0) )  {
+      opMode = OM_UNZ;
+      srcMode = (numFileNames == 0) ? SM_I2O : SM_F2O;
+   }
+
+
+   /*-- Look at the flags. --*/
+   for (aa = argList; aa != NULL; aa = aa->link) {
+      if (ISFLAG("--")) break;
+      if (aa->name[0] == '-' && aa->name[1] != '-') {
+         for (j = 1; aa->name[j] != '\0'; j++) {
+            switch (aa->name[j]) {
+               case 'c': srcMode          = SM_F2O; break;
+               case 'd': opMode           = OM_UNZ; break;
+               case 'z': opMode           = OM_Z; break;
+               case 'f': forceOverwrite   = True; break;
+               case 't': opMode           = OM_TEST; break;
+               case 'k': keepInputFiles   = True; break;
+               case 's': smallMode        = True; break;
+               case 'q': noisy            = False; break;
+               case '1': blockSize100k    = 1; break;
+               case '2': blockSize100k    = 2; break;
+               case '3': blockSize100k    = 3; break;
+               case '4': blockSize100k    = 4; break;
+               case '5': blockSize100k    = 5; break;
+               case '6': blockSize100k    = 6; break;
+               case '7': blockSize100k    = 7; break;
+               case '8': blockSize100k    = 8; break;
+               case '9': blockSize100k    = 9; break;
+               case 'V':
+               case 'L': license();            break;
+               case 'v': verbosity++; break;
+               case 'h': usage ( progName );
+                         exit ( 0 );
+                         break;
+               default:  fprintf ( stderr, "%s: Bad flag `%s'\n",
+                                   progName, aa->name );
+                         usage ( progName );
+                         exit ( 1 );
+                         break;
+            }
+         }
+      }
+   }
+   
+   /*-- And again ... --*/
+   for (aa = argList; aa != NULL; aa = aa->link) {
+      if (ISFLAG("--")) break;
+      if (ISFLAG("--stdout"))            srcMode          = SM_F2O;  else
+      if (ISFLAG("--decompress"))        opMode           = OM_UNZ;  else
+      if (ISFLAG("--compress"))          opMode           = OM_Z;    else
+      if (ISFLAG("--force"))             forceOverwrite   = True;    else
+      if (ISFLAG("--test"))              opMode           = OM_TEST; else
+      if (ISFLAG("--keep"))              keepInputFiles   = True;    else
+      if (ISFLAG("--small"))             smallMode        = True;    else
+      if (ISFLAG("--quiet"))             noisy            = False;   else
+      if (ISFLAG("--version"))           license();                  else
+      if (ISFLAG("--license"))           license();                  else
+      if (ISFLAG("--exponential"))       workFactor = 1;             else 
+      if (ISFLAG("--repetitive-best"))   redundant(aa->name);        else
+      if (ISFLAG("--repetitive-fast"))   redundant(aa->name);        else
+      if (ISFLAG("--verbose"))           verbosity++;                else
+      if (ISFLAG("--help"))              { usage ( progName ); exit ( 0 ); }
+         else
+         if (strncmp ( aa->name, "--", 2) == 0) {
+            fprintf ( stderr, "%s: Bad flag `%s'\n", progName, aa->name );
+            usage ( progName );
+            exit ( 1 );
+         }
+   }
+
+   if (verbosity > 4) verbosity = 4;
+   if (opMode == OM_Z && smallMode && blockSize100k > 2) 
+      blockSize100k = 2;
+
+   if (opMode == OM_TEST && srcMode == SM_F2O) {
+      fprintf ( stderr, "%s: -c and -t cannot be used together.\n",
+                progName );
+      exit ( 1 );
+   }
+
+   if (srcMode == SM_F2O && numFileNames == 0)
+      srcMode = SM_I2O;
+
+   if (opMode != OM_Z) blockSize100k = 0;
+
+   if (srcMode == SM_F2F) {
+      signal (SIGINT,  mySignalCatcher);
+      signal (SIGTERM, mySignalCatcher);
+#     if BZ_UNIX
+      signal (SIGHUP,  mySignalCatcher);
+#     endif
+   }
+
+   if (opMode == OM_Z) {
+     if (srcMode == SM_I2O) {
+        compress ( NULL );
+     } else {
+        decode = True;
+        for (aa = argList; aa != NULL; aa = aa->link) {
+           if (ISFLAG("--")) { decode = False; continue; }
+           if (aa->name[0] == '-' && decode) continue;
+           numFilesProcessed++;
+           compress ( aa->name );
+        }
+     }
+   } 
+   else
+
+   if (opMode == OM_UNZ) {
+      unzFailsExist = False;
+      if (srcMode == SM_I2O) {
+         uncompress ( NULL );
+      } else {
+         decode = True;
+         for (aa = argList; aa != NULL; aa = aa->link) {
+            if (ISFLAG("--")) { decode = False; continue; }
+            if (aa->name[0] == '-' && decode) continue;
+            numFilesProcessed++;
+            uncompress ( aa->name );
+         }      
+      }
+      if (unzFailsExist) { 
+         setExit(2); 
+         exit(exitValue);
+      }
+   } 
+
+   else {
+      testFailsExist = False;
+      if (srcMode == SM_I2O) {
+         testf ( NULL );
+      } else {
+         decode = True;
+         for (aa = argList; aa != NULL; aa = aa->link) {
+	    if (ISFLAG("--")) { decode = False; continue; }
+            if (aa->name[0] == '-' && decode) continue;
+            numFilesProcessed++;
+            testf ( aa->name );
+	 }
+      }
+      if (testFailsExist && noisy) {
+         fprintf ( stderr,
+           "\n"
+           "You can use the `bzip2recover' program to attempt to recover\n"
+           "data from undamaged sections of corrupted files.\n\n"
+         );
+         setExit(2);
+         exit(exitValue);
+      }
+   }
+
+   /* Free the argument list memory to mollify leak detectors 
+      (eg) Purify, Checker.  Serves no other useful purpose.
+   */
+   aa = argList;
+   while (aa != NULL) {
+      Cell* aa2 = aa->link;
+      if (aa->name != NULL) free(aa->name);
+      free(aa);
+      aa = aa2;
+   }
+
+   return exitValue;
+}
+
+
+/*-----------------------------------------------------------*/
+/*--- end                                         bzip2.c ---*/
+/*-----------------------------------------------------------*/
diff --git a/winsup/bz2lib/bzip2.txt b/winsup/bz2lib/bzip2.txt
new file mode 100644
index 000000000..4f1ae8620
--- /dev/null
+++ b/winsup/bz2lib/bzip2.txt
@@ -0,0 +1,376 @@
+
+
+NAME
+       bzip2, bunzip2 - a block-sorting file compressor, v1.0
+       bzcat - decompresses files to stdout
+       bzip2recover - recovers data from damaged bzip2 files
+
+
+SYNOPSIS
+       bzip2 [ -cdfkqstvzVL123456789 ] [ filenames ...  ]
+       bunzip2 [ -fkvsVL ] [ filenames ...  ]
+       bzcat [ -s ] [ filenames ...  ]
+       bzip2recover filename
+
+
+DESCRIPTION
+       bzip2  compresses  files  using  the Burrows-Wheeler block
+       sorting text compression algorithm,  and  Huffman  coding.
+       Compression  is  generally  considerably  better than that
+       achieved by more conventional LZ77/LZ78-based compressors,
+       and  approaches  the performance of the PPM family of sta-
+       tistical compressors.
+
+       The command-line options are deliberately very similar  to
+       those of GNU gzip, but they are not identical.
+
+       bzip2  expects  a list of file names to accompany the com-
+       mand-line flags.  Each file is replaced  by  a  compressed
+       version  of  itself,  with  the  name "original_name.bz2".
+       Each compressed file has the same modification date,  per-
+       missions, and, when possible, ownership as the correspond-
+       ing original, so that these properties  can  be  correctly
+       restored  at  decompression  time.   File name handling is
+       naive in the sense that there is no mechanism for preserv-
+       ing  original file names, permissions, ownerships or dates
+       in filesystems which lack these concepts, or have  serious
+       file name length restrictions, such as MS-DOS.
+
+       bzip2  and  bunzip2 will by default not overwrite existing
+       files.  If you want this to happen, specify the -f flag.
+
+       If no file names  are  specified,  bzip2  compresses  from
+       standard  input  to  standard output.  In this case, bzip2
+       will decline to write compressed output to a terminal,  as
+       this  would  be  entirely  incomprehensible  and therefore
+       pointless.
+
+       bunzip2 (or bzip2 -d) decompresses  all  specified  files.
+       Files which were not created by bzip2 will be detected and
+       ignored, and a warning issued.  bzip2  attempts  to  guess
+       the  filename  for  the decompressed file from that of the
+       compressed file as follows:
+
+              filename.bz2    becomes   filename
+              filename.bz     becomes   filename
+              filename.tbz2   becomes   filename.tar
+              filename.tbz    becomes   filename.tar
+              anyothername    becomes   anyothername.out
+
+       If the file does not end in one of the recognised endings,
+       .bz2,  .bz,  .tbz2 or .tbz, bzip2 complains that it cannot
+       guess the name of the original file, and uses the original
+       name with .out appended.
+
+       As  with compression, supplying no filenames causes decom-
+       pression from standard input to standard output.
+
+       bunzip2 will correctly decompress a file which is the con-
+       catenation of two or more compressed files.  The result is
+       the concatenation of the corresponding uncompressed files.
+       Integrity testing (-t) of concatenated compressed files is
+       also supported.
+
+       You can also compress or decompress files to the  standard
+       output  by giving the -c flag.  Multiple files may be com-
+       pressed and decompressed like this.  The resulting outputs
+       are  fed  sequentially to stdout.  Compression of multiple
+       files in this manner generates a stream containing  multi-
+       ple compressed file representations.  Such a stream can be
+       decompressed correctly only  by  bzip2  version  0.9.0  or
+       later.   Earlier  versions of bzip2 will stop after decom-
+       pressing the first file in the stream.
+
+       bzcat (or bzip2 -dc) decompresses all specified  files  to
+       the standard output.
+
+       bzip2  will  read arguments from the environment variables
+       BZIP2 and BZIP, in  that  order,  and  will  process  them
+       before  any  arguments  read  from the command line.  This
+       gives a convenient way to supply default arguments.
+
+       Compression is always performed, even  if  the  compressed
+       file  is slightly larger than the original.  Files of less
+       than about one hundred bytes tend to get larger, since the
+       compression  mechanism  has  a  constant  overhead  in the
+       region of 50 bytes.  Random data (including the output  of
+       most  file  compressors)  is  coded at about 8.05 bits per
+       byte, giving an expansion of around 0.5%.
+
+       As a self-check for your  protection,  bzip2  uses  32-bit
+       CRCs  to make sure that the decompressed version of a file
+       is identical to the original.  This guards against corrup-
+       tion  of  the compressed data, and against undetected bugs
+       in bzip2 (hopefully very unlikely).  The chances  of  data
+       corruption  going  undetected  is  microscopic,  about one
+       chance in four billion for each file processed.  Be aware,
+       though,  that  the  check occurs upon decompression, so it
+       can only tell you that something is wrong.  It can't  help
+       you  recover  the original uncompressed data.  You can use
+       bzip2recover to try to recover data from damaged files.
+
+       Return values: 0 for a normal exit,  1  for  environmental
+       problems  (file not found, invalid flags, I/O errors, &c),
+       2 to indicate a corrupt compressed file, 3 for an internal
+       consistency error (eg, bug) which caused bzip2 to panic.
+
+
+OPTIONS
+       -c --stdout
+              Compress or decompress to standard output.
+
+       -d --decompress
+              Force  decompression.  bzip2, bunzip2 and bzcat are
+              really the same program,  and  the  decision  about
+              what  actions to take is done on the basis of which
+              name is used.  This flag overrides that  mechanism,
+              and forces bzip2 to decompress.
+
+       -z --compress
+              The  complement  to -d: forces compression, regard-
+              less of the invokation name.
+
+       -t --test
+              Check integrity of the specified file(s), but don't
+              decompress  them.   This  really  performs  a trial
+              decompression and throws away the result.
+
+       -f --force
+              Force overwrite of output files.   Normally,  bzip2
+              will  not  overwrite  existing  output files.  Also
+              forces bzip2 to break hard links to files, which it
+              otherwise wouldn't do.
+
+       -k --keep
+              Keep  (don't delete) input files during compression
+              or decompression.
+
+       -s --small
+              Reduce memory usage, for compression, decompression
+              and  testing.   Files  are  decompressed and tested
+              using a modified algorithm which only requires  2.5
+              bytes  per  block byte.  This means any file can be
+              decompressed in 2300k of memory,  albeit  at  about
+              half the normal speed.
+
+              During  compression,  -s  selects  a  block size of
+              200k, which limits memory use to  around  the  same
+              figure,  at  the expense of your compression ratio.
+              In short, if your  machine  is  low  on  memory  (8
+              megabytes  or  less),  use  -s for everything.  See
+              MEMORY MANAGEMENT below.
+
+       -q --quiet
+              Suppress non-essential warning messages.   Messages
+              pertaining  to I/O errors and other critical events
+              will not be suppressed.
+
+       -v --verbose
+              Verbose mode -- show the compression ratio for each
+              file  processed.   Further  -v's  increase the ver-
+              bosity level, spewing out lots of information which
+              is primarily of interest for diagnostic purposes.
+
+       -L --license -V --version
+              Display  the  software  version,  license terms and
+              conditions.
+
+       -1 to -9
+              Set the block size to 100 k, 200 k ..  900  k  when
+              compressing.   Has  no  effect  when decompressing.
+              See MEMORY MANAGEMENT below.
+
+       --     Treats all subsequent arguments as file names, even
+              if they start with a dash.  This is so you can han-
+              dle files with names beginning  with  a  dash,  for
+              example: bzip2 -- -myfilename.
+
+       --repetitive-fast --repetitive-best
+              These  flags  are  redundant  in versions 0.9.5 and
+              above.  They provided some coarse control over  the
+              behaviour  of the sorting algorithm in earlier ver-
+              sions, which was sometimes useful.  0.9.5 and above
+              have  an  improved  algorithm  which  renders these
+              flags irrelevant.
+
+
+MEMORY MANAGEMENT
+       bzip2 compresses large files in blocks.   The  block  size
+       affects  both  the  compression  ratio  achieved,  and the
+       amount of memory needed for compression and decompression.
+       The  flags  -1  through  -9  specify  the block size to be
+       100,000 bytes through 900,000 bytes (the default)  respec-
+       tively.   At  decompression  time, the block size used for
+       compression is read from  the  header  of  the  compressed
+       file, and bunzip2 then allocates itself just enough memory
+       to decompress the file.  Since block sizes are  stored  in
+       compressed  files,  it follows that the flags -1 to -9 are
+       irrelevant to and so ignored during decompression.
+
+       Compression and decompression requirements, in bytes,  can
+       be estimated as:
+
+              Compression:   400k + ( 8 x block size )
+
+              Decompression: 100k + ( 4 x block size ), or
+                             100k + ( 2.5 x block size )
+
+       Larger  block  sizes  give  rapidly  diminishing  marginal
+       returns.  Most of the compression comes from the first two
+       or  three hundred k of block size, a fact worth bearing in
+       mind when using bzip2  on  small  machines.   It  is  also
+       important  to  appreciate  that  the  decompression memory
+       requirement is set at compression time by  the  choice  of
+       block size.
+
+       For  files  compressed  with  the default 900k block size,
+       bunzip2 will require about 3700 kbytes to decompress.   To
+       support decompression of any file on a 4 megabyte machine,
+       bunzip2 has an option to  decompress  using  approximately
+       half this amount of memory, about 2300 kbytes.  Decompres-
+       sion speed is also halved, so you should use  this  option
+       only where necessary.  The relevant flag is -s.
+
+       In general, try and use the largest block size memory con-
+       straints  allow,  since  that  maximises  the  compression
+       achieved.   Compression and decompression speed are virtu-
+       ally unaffected by block size.
+
+       Another significant point applies to files which fit in  a
+       single  block  --  that  means  most files you'd encounter
+       using a large block  size.   The  amount  of  real  memory
+       touched is proportional to the size of the file, since the
+       file is smaller than a block.  For example, compressing  a
+       file  20,000  bytes  long  with the flag -9 will cause the
+       compressor to allocate around 7600k of  memory,  but  only
+       touch 400k + 20000 * 8 = 560 kbytes of it.  Similarly, the
+       decompressor will allocate 3700k but  only  touch  100k  +
+       20000 * 4 = 180 kbytes.
+
+       Here  is a table which summarises the maximum memory usage
+       for different block sizes.  Also  recorded  is  the  total
+       compressed  size for 14 files of the Calgary Text Compres-
+       sion Corpus totalling 3,141,622 bytes.  This column  gives
+       some  feel  for  how  compression  varies with block size.
+       These figures tend to understate the advantage  of  larger
+       block  sizes  for  larger files, since the Corpus is domi-
+       nated by smaller files.
+
+                  Compress   Decompress   Decompress   Corpus
+           Flag     usage      usage       -s usage     Size
+
+            -1      1200k       500k         350k      914704
+            -2      2000k       900k         600k      877703
+            -3      2800k      1300k         850k      860338
+            -4      3600k      1700k        1100k      846899
+            -5      4400k      2100k        1350k      845160
+            -6      5200k      2500k        1600k      838626
+            -7      6100k      2900k        1850k      834096
+            -8      6800k      3300k        2100k      828642
+            -9      7600k      3700k        2350k      828642
+
+
+RECOVERING DATA FROM DAMAGED FILES
+       bzip2 compresses files in blocks, usually 900kbytes  long.
+       Each block is handled independently.  If a media or trans-
+       mission error causes a multi-block  .bz2  file  to  become
+       damaged,  it  may  be  possible  to  recover data from the
+       undamaged blocks in the file.
+
+       The compressed representation of each block  is  delimited
+       by  a  48-bit pattern, which makes it possible to find the
+       block boundaries with reasonable  certainty.   Each  block
+       also  carries its own 32-bit CRC, so damaged blocks can be
+       distinguished from undamaged ones.
+
+       bzip2recover is a  simple  program  whose  purpose  is  to
+       search  for blocks in .bz2 files, and write each block out
+       into its own .bz2 file.  You can then use bzip2 -t to test
+       the integrity of the resulting files, and decompress those
+       which are undamaged.
+
+       bzip2recover takes a single argument, the name of the dam-
+       aged file, and writes a number of files "rec0001file.bz2",
+       "rec0002file.bz2", etc, containing the  extracted  blocks.
+       The  output  filenames  are  designed  so  that the use of
+       wildcards in subsequent processing -- for example,  "bzip2
+       -dc   rec*file.bz2 > recovered_data" -- lists the files in
+       the correct order.
+
+       bzip2recover should be of most use dealing with large .bz2
+       files,  as  these will contain many blocks.  It is clearly
+       futile to use it on damaged single-block  files,  since  a
+       damaged  block  cannot  be recovered.  If you wish to min-
+       imise any potential data loss through media  or  transmis-
+       sion errors, you might consider compressing with a smaller
+       block size.
+
+
+PERFORMANCE NOTES
+       The sorting phase of compression gathers together  similar
+       strings  in  the  file.  Because of this, files containing
+       very long runs of  repeated  symbols,  like  "aabaabaabaab
+       ..."   (repeated  several hundred times) may compress more
+       slowly than normal.  Versions 0.9.5 and  above  fare  much
+       better  than previous versions in this respect.  The ratio
+       between worst-case and average-case compression time is in
+       the  region  of  10:1.  For previous versions, this figure
+       was more like 100:1.  You can use the -vvvv option to mon-
+       itor progress in great detail, if you want.
+
+       Decompression speed is unaffected by these phenomena.
+
+       bzip2  usually  allocates  several  megabytes of memory to
+       operate in, and then charges all over it in a fairly  ran-
+       dom  fashion.   This means that performance, both for com-
+       pressing and decompressing, is largely determined  by  the
+       speed  at  which  your  machine  can service cache misses.
+       Because of this, small changes to the code to  reduce  the
+       miss  rate  have  been observed to give disproportionately
+       large performance improvements.  I imagine bzip2 will per-
+       form best on machines with very large caches.
+
+
+CAVEATS
+       I/O  error  messages  are not as helpful as they could be.
+       bzip2 tries hard to detect I/O errors  and  exit  cleanly,
+       but  the  details  of  what  the problem is sometimes seem
+       rather misleading.
+
+       This manual page pertains to version 1.0 of bzip2.  Com-
+       pressed  data created by this version is entirely forwards
+       and  backwards  compatible  with   the   previous   public
+       releases,  versions  0.1pl2, 0.9.0 and 0.9.5, but with the
+       following exception: 0.9.0 and above can correctly  decom-
+       press multiple concatenated compressed files.  0.1pl2 can-
+       not do this; it will stop  after  decompressing  just  the
+       first file in the stream.
+
+       bzip2recover  uses  32-bit integers to represent bit posi-
+       tions in compressed files, so it cannot handle  compressed
+       files  more than 512 megabytes long.  This could easily be
+       fixed.
+
+
+AUTHOR
+       Julian Seward, jseward@acm.org.
+
+       http://sourceware.cygnus.com/bzip2
+       http://www.muraroa.demon.co.uk
+
+       The ideas embodied in bzip2 are due to (at least) the fol-
+       lowing  people: Michael Burrows and David Wheeler (for the
+       block sorting transformation), David Wheeler  (again,  for
+       the Huffman coder), Peter Fenwick (for the structured cod-
+       ing model in the original bzip, and many refinements), and
+       Alistair  Moffat,  Radford  Neal  and  Ian Witten (for the
+       arithmetic  coder  in  the  original  bzip).   I  am  much
+       indebted for their help, support and advice.  See the man-
+       ual in the source distribution for pointers to sources  of
+       documentation.  Christian von Roques encouraged me to look
+       for faster sorting algorithms, so as to speed up  compres-
+       sion.  Bela Lubkin encouraged me to improve the worst-case
+       compression performance.  Many people sent patches, helped
+       with  portability problems, lent machines, gave advice and
+       were generally helpful.
+
diff --git a/winsup/bz2lib/bzip2recover.c b/winsup/bz2lib/bzip2recover.c
new file mode 100644
index 000000000..ba3d17563
--- /dev/null
+++ b/winsup/bz2lib/bzip2recover.c
@@ -0,0 +1,435 @@
+
+/*-----------------------------------------------------------*/
+/*--- Block recoverer program for bzip2                   ---*/
+/*---                                      bzip2recover.c ---*/
+/*-----------------------------------------------------------*/
+
+/*--
+  This program is bzip2recover, a program to attempt data 
+  salvage from damaged files created by the accompanying
+  bzip2-1.0 program.
+
+  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+  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. 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.
+
+  3. Altered source versions must be plainly marked as such, and must
+     not be misrepresented as being the original software.
+
+  4. 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.
+
+  Julian Seward, Cambridge, UK.
+  jseward@acm.org
+  bzip2/libbzip2 version 1.0 of 21 March 2000
+--*/
+
+/*--
+  This program is a complete hack and should be rewritten
+  properly.  It isn't very complicated.
+--*/
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef  unsigned int   UInt32;
+typedef  int            Int32;
+typedef  unsigned char  UChar;
+typedef  char           Char;
+typedef  unsigned char  Bool;
+#define True    ((Bool)1)
+#define False   ((Bool)0)
+
+
+Char inFileName[2000];
+Char outFileName[2000];
+Char progName[2000];
+
+UInt32 bytesOut = 0;
+UInt32 bytesIn  = 0;
+
+
+/*---------------------------------------------------*/
+/*--- I/O errors                                  ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------*/
+void readError ( void )
+{
+   fprintf ( stderr,
+             "%s: I/O error reading `%s', possible reason follows.\n",
+            progName, inFileName );
+   perror ( progName );
+   fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n",
+             progName );
+   exit ( 1 );
+}
+
+
+/*---------------------------------------------*/
+void writeError ( void )
+{
+   fprintf ( stderr,
+             "%s: I/O error reading `%s', possible reason follows.\n",
+            progName, inFileName );
+   perror ( progName );
+   fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n",
+             progName );
+   exit ( 1 );
+}
+
+
+/*---------------------------------------------*/
+void mallocFail ( Int32 n )
+{
+   fprintf ( stderr,
+             "%s: malloc failed on request for %d bytes.\n",
+            progName, n );
+   fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n",
+             progName );
+   exit ( 1 );
+}
+
+
+/*---------------------------------------------------*/
+/*--- Bit stream I/O                              ---*/
+/*---------------------------------------------------*/
+
+typedef
+   struct {
+      FILE*  handle;
+      Int32  buffer;
+      Int32  buffLive;
+      Char   mode;
+   }
+   BitStream;
+
+
+/*---------------------------------------------*/
+BitStream* bsOpenReadStream ( FILE* stream )
+{
+   BitStream *bs = malloc ( sizeof(BitStream) );
+   if (bs == NULL) mallocFail ( sizeof(BitStream) );
+   bs->handle = stream;
+   bs->buffer = 0;
+   bs->buffLive = 0;
+   bs->mode = 'r';
+   return bs;
+}
+
+
+/*---------------------------------------------*/
+BitStream* bsOpenWriteStream ( FILE* stream )
+{
+   BitStream *bs = malloc ( sizeof(BitStream) );
+   if (bs == NULL) mallocFail ( sizeof(BitStream) );
+   bs->handle = stream;
+   bs->buffer = 0;
+   bs->buffLive = 0;
+   bs->mode = 'w';
+   return bs;
+}
+
+
+/*---------------------------------------------*/
+void bsPutBit ( BitStream* bs, Int32 bit )
+{
+   if (bs->buffLive == 8) {
+      Int32 retVal = putc ( (UChar) bs->buffer, bs->handle );
+      if (retVal == EOF) writeError();
+      bytesOut++;
+      bs->buffLive = 1;
+      bs->buffer = bit & 0x1;
+   } else {
+      bs->buffer = ( (bs->buffer << 1) | (bit & 0x1) );
+      bs->buffLive++;
+   };
+}
+
+
+/*---------------------------------------------*/
+/*--
+   Returns 0 or 1, or 2 to indicate EOF.
+--*/
+Int32 bsGetBit ( BitStream* bs )
+{
+   if (bs->buffLive > 0) {
+      bs->buffLive --;
+      return ( ((bs->buffer) >> (bs->buffLive)) & 0x1 );
+   } else {
+      Int32 retVal = getc ( bs->handle );
+      if ( retVal == EOF ) {
+         if (errno != 0) readError();
+         return 2;
+      }
+      bs->buffLive = 7;
+      bs->buffer = retVal;
+      return ( ((bs->buffer) >> 7) & 0x1 );
+   }
+}
+
+
+/*---------------------------------------------*/
+void bsClose ( BitStream* bs )
+{
+   Int32 retVal;
+
+   if ( bs->mode == 'w' ) {
+      while ( bs->buffLive < 8 ) {
+         bs->buffLive++;
+         bs->buffer <<= 1;
+      };
+      retVal = putc ( (UChar) (bs->buffer), bs->handle );
+      if (retVal == EOF) writeError();
+      bytesOut++;
+      retVal = fflush ( bs->handle );
+      if (retVal == EOF) writeError();
+   }
+   retVal = fclose ( bs->handle );
+   if (retVal == EOF) {
+      if (bs->mode == 'w') writeError(); else readError();
+   }
+   free ( bs );
+}
+
+
+/*---------------------------------------------*/
+void bsPutUChar ( BitStream* bs, UChar c )
+{
+   Int32 i;
+   for (i = 7; i >= 0; i--)
+      bsPutBit ( bs, (((UInt32) c) >> i) & 0x1 );
+}
+
+
+/*---------------------------------------------*/
+void bsPutUInt32 ( BitStream* bs, UInt32 c )
+{
+   Int32 i;
+
+   for (i = 31; i >= 0; i--)
+      bsPutBit ( bs, (c >> i) & 0x1 );
+}
+
+
+/*---------------------------------------------*/
+Bool endsInBz2 ( Char* name )
+{
+   Int32 n = strlen ( name );
+   if (n <= 4) return False;
+   return
+      (name[n-4] == '.' &&
+       name[n-3] == 'b' &&
+       name[n-2] == 'z' &&
+       name[n-1] == '2');
+}
+
+
+/*---------------------------------------------------*/
+/*---                                             ---*/
+/*---------------------------------------------------*/
+
+#define BLOCK_HEADER_HI  0x00003141UL
+#define BLOCK_HEADER_LO  0x59265359UL
+
+#define BLOCK_ENDMARK_HI 0x00001772UL
+#define BLOCK_ENDMARK_LO 0x45385090UL
+
+
+UInt32 bStart[20000];
+UInt32 bEnd[20000];
+UInt32 rbStart[20000];
+UInt32 rbEnd[20000];
+
+Int32 main ( Int32 argc, Char** argv )
+{
+   FILE*       inFile;
+   FILE*       outFile;
+   BitStream*  bsIn, *bsWr;
+   Int32       currBlock, b, wrBlock;
+   UInt32      bitsRead;
+   Int32       rbCtr;
+
+
+   UInt32      buffHi, buffLo, blockCRC;
+   Char*       p;
+
+   strcpy ( progName, argv[0] );
+   inFileName[0] = outFileName[0] = 0;
+
+   fprintf ( stderr, "bzip2recover 1.0: extracts blocks from damaged .bz2 files.\n" );
+
+   if (argc != 2) {
+      fprintf ( stderr, "%s: usage is `%s damaged_file_name'.\n",
+                        progName, progName );
+      exit(1);
+   }
+
+   strcpy ( inFileName, argv[1] );
+
+   inFile = fopen ( inFileName, "rb" );
+   if (inFile == NULL) {
+      fprintf ( stderr, "%s: can't read `%s'\n", progName, inFileName );
+      exit(1);
+   }
+
+   bsIn = bsOpenReadStream ( inFile );
+   fprintf ( stderr, "%s: searching for block boundaries ...\n", progName );
+
+   bitsRead = 0;
+   buffHi = buffLo = 0;
+   currBlock = 0;
+   bStart[currBlock] = 0;
+
+   rbCtr = 0;
+
+   while (True) {
+      b = bsGetBit ( bsIn );
+      bitsRead++;
+      if (b == 2) {
+         if (bitsRead >= bStart[currBlock] &&
+            (bitsRead - bStart[currBlock]) >= 40) {
+            bEnd[currBlock] = bitsRead-1;
+            if (currBlock > 0)
+               fprintf ( stderr, "   block %d runs from %d to %d (incomplete)\n",
+                         currBlock,  bStart[currBlock], bEnd[currBlock] );
+         } else
+            currBlock--;
+         break;
+      }
+      buffHi = (buffHi << 1) | (buffLo >> 31);
+      buffLo = (buffLo << 1) | (b & 1);
+      if ( ( (buffHi & 0x0000ffff) == BLOCK_HEADER_HI 
+             && buffLo == BLOCK_HEADER_LO)
+           || 
+           ( (buffHi & 0x0000ffff) == BLOCK_ENDMARK_HI 
+             && buffLo == BLOCK_ENDMARK_LO)
+         ) {
+         if (bitsRead > 49)
+            bEnd[currBlock] = bitsRead-49; else
+            bEnd[currBlock] = 0;
+         if (currBlock > 0 &&
+	     (bEnd[currBlock] - bStart[currBlock]) >= 130) {
+            fprintf ( stderr, "   block %d runs from %d to %d\n",
+                      rbCtr+1,  bStart[currBlock], bEnd[currBlock] );
+            rbStart[rbCtr] = bStart[currBlock];
+            rbEnd[rbCtr] = bEnd[currBlock];
+            rbCtr++;
+         }
+         currBlock++;
+
+         bStart[currBlock] = bitsRead;
+      }
+   }
+
+   bsClose ( bsIn );
+
+   /*-- identified blocks run from 1 to rbCtr inclusive. --*/
+
+   if (rbCtr < 1) {
+      fprintf ( stderr,
+                "%s: sorry, I couldn't find any block boundaries.\n",
+                progName );
+      exit(1);
+   };
+
+   fprintf ( stderr, "%s: splitting into blocks\n", progName );
+
+   inFile = fopen ( inFileName, "rb" );
+   if (inFile == NULL) {
+      fprintf ( stderr, "%s: can't open `%s'\n", progName, inFileName );
+      exit(1);
+   }
+   bsIn = bsOpenReadStream ( inFile );
+
+   /*-- placate gcc's dataflow analyser --*/
+   blockCRC = 0; bsWr = 0;
+
+   bitsRead = 0;
+   outFile = NULL;
+   wrBlock = 0;
+   while (True) {
+      b = bsGetBit(bsIn);
+      if (b == 2) break;
+      buffHi = (buffHi << 1) | (buffLo >> 31);
+      buffLo = (buffLo << 1) | (b & 1);
+      if (bitsRead == 47+rbStart[wrBlock]) 
+         blockCRC = (buffHi << 16) | (buffLo >> 16);
+
+      if (outFile != NULL && bitsRead >= rbStart[wrBlock]
+                          && bitsRead <= rbEnd[wrBlock]) {
+         bsPutBit ( bsWr, b );
+      }
+
+      bitsRead++;
+
+      if (bitsRead == rbEnd[wrBlock]+1) {
+         if (outFile != NULL) {
+            bsPutUChar ( bsWr, 0x17 ); bsPutUChar ( bsWr, 0x72 );
+            bsPutUChar ( bsWr, 0x45 ); bsPutUChar ( bsWr, 0x38 );
+            bsPutUChar ( bsWr, 0x50 ); bsPutUChar ( bsWr, 0x90 );
+            bsPutUInt32 ( bsWr, blockCRC );
+            bsClose ( bsWr );
+         }
+         if (wrBlock >= rbCtr) break;
+         wrBlock++;
+      } else
+      if (bitsRead == rbStart[wrBlock]) {
+         outFileName[0] = 0;
+         sprintf ( outFileName, "rec%4d", wrBlock+1 );
+         for (p = outFileName; *p != 0; p++) if (*p == ' ') *p = '0';
+         strcat ( outFileName, inFileName );
+         if ( !endsInBz2(outFileName)) strcat ( outFileName, ".bz2" );
+
+         fprintf ( stderr, "   writing block %d to `%s' ...\n",
+                           wrBlock+1, outFileName );
+
+         outFile = fopen ( outFileName, "wb" );
+         if (outFile == NULL) {
+            fprintf ( stderr, "%s: can't write `%s'\n",
+                      progName, outFileName );
+            exit(1);
+         }
+         bsWr = bsOpenWriteStream ( outFile );
+         bsPutUChar ( bsWr, 'B' ); bsPutUChar ( bsWr, 'Z' );
+         bsPutUChar ( bsWr, 'h' ); bsPutUChar ( bsWr, '9' );
+         bsPutUChar ( bsWr, 0x31 ); bsPutUChar ( bsWr, 0x41 );
+         bsPutUChar ( bsWr, 0x59 ); bsPutUChar ( bsWr, 0x26 );
+         bsPutUChar ( bsWr, 0x53 ); bsPutUChar ( bsWr, 0x59 );
+      }
+   }
+
+   fprintf ( stderr, "%s: finished\n", progName );
+   return 0;
+}
+
+
+
+/*-----------------------------------------------------------*/
+/*--- end                                  bzip2recover.c ---*/
+/*-----------------------------------------------------------*/
diff --git a/winsup/bz2lib/bzlib.c b/winsup/bz2lib/bzlib.c
new file mode 100644
index 000000000..4a06d9f14
--- /dev/null
+++ b/winsup/bz2lib/bzlib.c
@@ -0,0 +1,1564 @@
+
+/*-------------------------------------------------------------*/
+/*--- Library top-level functions.                          ---*/
+/*---                                               bzlib.c ---*/
+/*-------------------------------------------------------------*/
+
+/*--
+  This file is a part of bzip2 and/or libbzip2, a program and
+  library for lossless, block-sorting data compression.
+
+  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+  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. 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.
+
+  3. Altered source versions must be plainly marked as such, and must
+     not be misrepresented as being the original software.
+
+  4. 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.
+
+  Julian Seward, Cambridge, UK.
+  jseward@acm.org
+  bzip2/libbzip2 version 1.0 of 21 March 2000
+
+  This program is based on (at least) the work of:
+     Mike Burrows
+     David Wheeler
+     Peter Fenwick
+     Alistair Moffat
+     Radford Neal
+     Ian H. Witten
+     Robert Sedgewick
+     Jon L. Bentley
+
+  For more information on these sources, see the manual.
+--*/
+
+/*--
+   CHANGES
+   ~~~~~~~
+   0.9.0 -- original version.
+
+   0.9.0a/b -- no changes in this file.
+
+   0.9.0c
+      * made zero-length BZ_FLUSH work correctly in bzCompress().
+      * fixed bzWrite/bzRead to ignore zero-length requests.
+      * fixed bzread to correctly handle read requests after EOF.
+      * wrong parameter order in call to bzDecompressInit in
+        bzBuffToBuffDecompress.  Fixed.
+--*/
+
+#include "bzlib_private.h"
+
+
+/*---------------------------------------------------*/
+/*--- Compression stuff                           ---*/
+/*---------------------------------------------------*/
+
+
+/*---------------------------------------------------*/
+#ifndef BZ_NO_STDIO
+void BZ2_bz__AssertH__fail ( int errcode )
+{
+   fprintf(stderr, 
+      "\n\nbzip2/libbzip2: internal error number %d.\n"
+      "This is a bug in bzip2/libbzip2, %s.\n"
+      "Please report it to me at: jseward@acm.org.  If this happened\n"
+      "when you were using some program which uses libbzip2 as a\n"
+      "component, you should also report this bug to the author(s)\n"
+      "of that program.  Please make an effort to report this bug;\n"
+      "timely and accurate bug reports eventually lead to higher\n"
+      "quality software.  Thanks.  Julian Seward, 21 March 2000.\n\n",
+      errcode,
+      BZ2_bzlibVersion()
+   );
+   exit(3);
+}
+#endif
+
+
+/*---------------------------------------------------*/
+static
+int bz_config_ok ( void )
+{
+   if (sizeof(int)   != 4) return 0;
+   if (sizeof(short) != 2) return 0;
+   if (sizeof(char)  != 1) return 0;
+   return 1;
+}
+
+
+/*---------------------------------------------------*/
+static
+void* default_bzalloc ( void* opaque, Int32 items, Int32 size )
+{
+   void* v = malloc ( items * size );
+   return v;
+}
+
+static
+void default_bzfree ( void* opaque, void* addr )
+{
+   if (addr != NULL) free ( addr );
+}
+
+
+/*---------------------------------------------------*/
+static
+void prepare_new_block ( EState* s )
+{
+   Int32 i;
+   s->nblock = 0;
+   s->numZ = 0;
+   s->state_out_pos = 0;
+   BZ_INITIALISE_CRC ( s->blockCRC );
+   for (i = 0; i < 256; i++) s->inUse[i] = False;
+   s->blockNo++;
+}
+
+
+/*---------------------------------------------------*/
+static
+void init_RL ( EState* s )
+{
+   s->state_in_ch  = 256;
+   s->state_in_len = 0;
+}
+
+
+static
+Bool isempty_RL ( EState* s )
+{
+   if (s->state_in_ch < 256 && s->state_in_len > 0)
+      return False; else
+      return True;
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzCompressInit) 
+                    ( bz_stream* strm, 
+                     int        blockSize100k,
+                     int        verbosity,
+                     int        workFactor )
+{
+   Int32   n;
+   EState* s;
+
+   if (!bz_config_ok()) return BZ_CONFIG_ERROR;
+
+   if (strm == NULL || 
+       blockSize100k < 1 || blockSize100k > 9 ||
+       workFactor < 0 || workFactor > 250)
+     return BZ_PARAM_ERROR;
+
+   if (workFactor == 0) workFactor = 30;
+   if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc;
+   if (strm->bzfree == NULL) strm->bzfree = default_bzfree;
+
+   s = BZALLOC( sizeof(EState) );
+   if (s == NULL) return BZ_MEM_ERROR;
+   s->strm = strm;
+
+   s->arr1 = NULL;
+   s->arr2 = NULL;
+   s->ftab = NULL;
+
+   n       = 100000 * blockSize100k;
+   s->arr1 = BZALLOC( n                  * sizeof(UInt32) );
+   s->arr2 = BZALLOC( (n+BZ_N_OVERSHOOT) * sizeof(UInt32) );
+   s->ftab = BZALLOC( 65537              * sizeof(UInt32) );
+
+   if (s->arr1 == NULL || s->arr2 == NULL || s->ftab == NULL) {
+      if (s->arr1 != NULL) BZFREE(s->arr1);
+      if (s->arr2 != NULL) BZFREE(s->arr2);
+      if (s->ftab != NULL) BZFREE(s->ftab);
+      if (s       != NULL) BZFREE(s);
+      return BZ_MEM_ERROR;
+   }
+
+   s->blockNo           = 0;
+   s->state             = BZ_S_INPUT;
+   s->mode              = BZ_M_RUNNING;
+   s->combinedCRC       = 0;
+   s->blockSize100k     = blockSize100k;
+   s->nblockMAX         = 100000 * blockSize100k - 19;
+   s->verbosity         = verbosity;
+   s->workFactor        = workFactor;
+
+   s->block             = (UChar*)s->arr2;
+   s->mtfv              = (UInt16*)s->arr1;
+   s->zbits             = NULL;
+   s->ptr               = (UInt32*)s->arr1;
+
+   strm->state          = s;
+   strm->total_in_lo32  = 0;
+   strm->total_in_hi32  = 0;
+   strm->total_out_lo32 = 0;
+   strm->total_out_hi32 = 0;
+   init_RL ( s );
+   prepare_new_block ( s );
+   return BZ_OK;
+}
+
+
+/*---------------------------------------------------*/
+static
+void add_pair_to_block ( EState* s )
+{
+   Int32 i;
+   UChar ch = (UChar)(s->state_in_ch);
+   for (i = 0; i < s->state_in_len; i++) {
+      BZ_UPDATE_CRC( s->blockCRC, ch );
+   }
+   s->inUse[s->state_in_ch] = True;
+   switch (s->state_in_len) {
+      case 1:
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         break;
+      case 2:
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         break;
+      case 3:
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         break;
+      default:
+         s->inUse[s->state_in_len-4] = True;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = (UChar)ch; s->nblock++;
+         s->block[s->nblock] = ((UChar)(s->state_in_len-4));
+         s->nblock++;
+         break;
+   }
+}
+
+
+/*---------------------------------------------------*/
+static
+void flush_RL ( EState* s )
+{
+   if (s->state_in_ch < 256) add_pair_to_block ( s );
+   init_RL ( s );
+}
+
+
+/*---------------------------------------------------*/
+#define ADD_CHAR_TO_BLOCK(zs,zchh0)               \
+{                                                 \
+   UInt32 zchh = (UInt32)(zchh0);                 \
+   /*-- fast track the common case --*/           \
+   if (zchh != zs->state_in_ch &&                 \
+       zs->state_in_len == 1) {                   \
+      UChar ch = (UChar)(zs->state_in_ch);        \
+      BZ_UPDATE_CRC( zs->blockCRC, ch );          \
+      zs->inUse[zs->state_in_ch] = True;          \
+      zs->block[zs->nblock] = (UChar)ch;          \
+      zs->nblock++;                               \
+      zs->state_in_ch = zchh;                     \
+   }                                              \
+   else                                           \
+   /*-- general, uncommon cases --*/              \
+   if (zchh != zs->state_in_ch ||                 \
+      zs->state_in_len == 255) {                  \
+      if (zs->state_in_ch < 256)                  \
+         add_pair_to_block ( zs );                \
+      zs->state_in_ch = zchh;                     \
+      zs->state_in_len = 1;                       \
+   } else {                                       \
+      zs->state_in_len++;                         \
+   }                                              \
+}
+
+
+/*---------------------------------------------------*/
+static
+Bool copy_input_until_stop ( EState* s )
+{
+   Bool progress_in = False;
+
+   if (s->mode == BZ_M_RUNNING) {
+
+      /*-- fast track the common case --*/
+      while (True) {
+         /*-- block full? --*/
+         if (s->nblock >= s->nblockMAX) break;
+         /*-- no input? --*/
+         if (s->strm->avail_in == 0) break;
+         progress_in = True;
+         ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) ); 
+         s->strm->next_in++;
+         s->strm->avail_in--;
+         s->strm->total_in_lo32++;
+         if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++;
+      }
+
+   } else {
+
+      /*-- general, uncommon case --*/
+      while (True) {
+         /*-- block full? --*/
+         if (s->nblock >= s->nblockMAX) break;
+         /*-- no input? --*/
+         if (s->strm->avail_in == 0) break;
+         /*-- flush/finish end? --*/
+         if (s->avail_in_expect == 0) break;
+         progress_in = True;
+         ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) ); 
+         s->strm->next_in++;
+         s->strm->avail_in--;
+         s->strm->total_in_lo32++;
+         if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++;
+         s->avail_in_expect--;
+      }
+   }
+   return progress_in;
+}
+
+
+/*---------------------------------------------------*/
+static
+Bool copy_output_until_stop ( EState* s )
+{
+   Bool progress_out = False;
+
+   while (True) {
+
+      /*-- no output space? --*/
+      if (s->strm->avail_out == 0) break;
+
+      /*-- block done? --*/
+      if (s->state_out_pos >= s->numZ) break;
+
+      progress_out = True;
+      *(s->strm->next_out) = s->zbits[s->state_out_pos];
+      s->state_out_pos++;
+      s->strm->avail_out--;
+      s->strm->next_out++;
+      s->strm->total_out_lo32++;
+      if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
+   }
+
+   return progress_out;
+}
+
+
+/*---------------------------------------------------*/
+static
+Bool handle_compress ( bz_stream* strm )
+{
+   Bool progress_in  = False;
+   Bool progress_out = False;
+   EState* s = strm->state;
+   
+   while (True) {
+
+      if (s->state == BZ_S_OUTPUT) {
+         progress_out |= copy_output_until_stop ( s );
+         if (s->state_out_pos < s->numZ) break;
+         if (s->mode == BZ_M_FINISHING && 
+             s->avail_in_expect == 0 &&
+             isempty_RL(s)) break;
+         prepare_new_block ( s );
+         s->state = BZ_S_INPUT;
+         if (s->mode == BZ_M_FLUSHING && 
+             s->avail_in_expect == 0 &&
+             isempty_RL(s)) break;
+      }
+
+      if (s->state == BZ_S_INPUT) {
+         progress_in |= copy_input_until_stop ( s );
+         if (s->mode != BZ_M_RUNNING && s->avail_in_expect == 0) {
+            flush_RL ( s );
+            BZ2_compressBlock ( s, (Bool)(s->mode == BZ_M_FINISHING) );
+            s->state = BZ_S_OUTPUT;
+         }
+         else
+         if (s->nblock >= s->nblockMAX) {
+            BZ2_compressBlock ( s, False );
+            s->state = BZ_S_OUTPUT;
+         }
+         else
+         if (s->strm->avail_in == 0) {
+            break;
+         }
+      }
+
+   }
+
+   return progress_in || progress_out;
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzCompress) ( bz_stream *strm, int action )
+{
+   Bool progress;
+   EState* s;
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   s = strm->state;
+   if (s == NULL) return BZ_PARAM_ERROR;
+   if (s->strm != strm) return BZ_PARAM_ERROR;
+
+   preswitch:
+   switch (s->mode) {
+
+      case BZ_M_IDLE:
+         return BZ_SEQUENCE_ERROR;
+
+      case BZ_M_RUNNING:
+         if (action == BZ_RUN) {
+            progress = handle_compress ( strm );
+            return progress ? BZ_RUN_OK : BZ_PARAM_ERROR;
+         } 
+         else
+	 if (action == BZ_FLUSH) {
+            s->avail_in_expect = strm->avail_in;
+            s->mode = BZ_M_FLUSHING;
+            goto preswitch;
+         }
+         else
+         if (action == BZ_FINISH) {
+            s->avail_in_expect = strm->avail_in;
+            s->mode = BZ_M_FINISHING;
+            goto preswitch;
+         }
+         else 
+            return BZ_PARAM_ERROR;
+
+      case BZ_M_FLUSHING:
+         if (action != BZ_FLUSH) return BZ_SEQUENCE_ERROR;
+         if (s->avail_in_expect != s->strm->avail_in) 
+            return BZ_SEQUENCE_ERROR;
+         progress = handle_compress ( strm );
+         if (s->avail_in_expect > 0 || !isempty_RL(s) ||
+             s->state_out_pos < s->numZ) return BZ_FLUSH_OK;
+         s->mode = BZ_M_RUNNING;
+         return BZ_RUN_OK;
+
+      case BZ_M_FINISHING:
+         if (action != BZ_FINISH) return BZ_SEQUENCE_ERROR;
+         if (s->avail_in_expect != s->strm->avail_in) 
+            return BZ_SEQUENCE_ERROR;
+         progress = handle_compress ( strm );
+         if (!progress) return BZ_SEQUENCE_ERROR;
+         if (s->avail_in_expect > 0 || !isempty_RL(s) ||
+             s->state_out_pos < s->numZ) return BZ_FINISH_OK;
+         s->mode = BZ_M_IDLE;
+         return BZ_STREAM_END;
+   }
+   return BZ_OK; /*--not reached--*/
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzCompressEnd)  ( bz_stream *strm )
+{
+   EState* s;
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   s = strm->state;
+   if (s == NULL) return BZ_PARAM_ERROR;
+   if (s->strm != strm) return BZ_PARAM_ERROR;
+
+   if (s->arr1 != NULL) BZFREE(s->arr1);
+   if (s->arr2 != NULL) BZFREE(s->arr2);
+   if (s->ftab != NULL) BZFREE(s->ftab);
+   BZFREE(strm->state);
+
+   strm->state = NULL;   
+
+   return BZ_OK;
+}
+
+
+/*---------------------------------------------------*/
+/*--- Decompression stuff                         ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzDecompressInit) 
+                     ( bz_stream* strm, 
+                       int        verbosity,
+                       int        small )
+{
+   DState* s;
+
+   if (!bz_config_ok()) return BZ_CONFIG_ERROR;
+
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   if (small != 0 && small != 1) return BZ_PARAM_ERROR;
+   if (verbosity < 0 || verbosity > 4) return BZ_PARAM_ERROR;
+
+   if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc;
+   if (strm->bzfree == NULL) strm->bzfree = default_bzfree;
+
+   s = BZALLOC( sizeof(DState) );
+   if (s == NULL) return BZ_MEM_ERROR;
+   s->strm                  = strm;
+   strm->state              = s;
+   s->state                 = BZ_X_MAGIC_1;
+   s->bsLive                = 0;
+   s->bsBuff                = 0;
+   s->calculatedCombinedCRC = 0;
+   strm->total_in_lo32      = 0;
+   strm->total_in_hi32      = 0;
+   strm->total_out_lo32     = 0;
+   strm->total_out_hi32     = 0;
+   s->smallDecompress       = (Bool)small;
+   s->ll4                   = NULL;
+   s->ll16                  = NULL;
+   s->tt                    = NULL;
+   s->currBlockNo           = 0;
+   s->verbosity             = verbosity;
+
+   return BZ_OK;
+}
+
+
+/*---------------------------------------------------*/
+static
+void unRLE_obuf_to_output_FAST ( DState* s )
+{
+   UChar k1;
+
+   if (s->blockRandomised) {
+
+      while (True) {
+         /* try to finish existing run */
+         while (True) {
+            if (s->strm->avail_out == 0) return;
+            if (s->state_out_len == 0) break;
+            *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
+            BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
+            s->state_out_len--;
+            s->strm->next_out++;
+            s->strm->avail_out--;
+            s->strm->total_out_lo32++;
+            if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
+         }
+   
+         /* can a new run be started? */
+         if (s->nblock_used == s->save_nblock+1) return;
+               
+   
+         s->state_out_len = 1;
+         s->state_out_ch = s->k0;
+         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 2;
+         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 3;
+         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         BZ_GET_FAST(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         s->state_out_len = ((Int32)k1) + 4;
+         BZ_GET_FAST(s->k0); BZ_RAND_UPD_MASK; 
+         s->k0 ^= BZ_RAND_MASK; s->nblock_used++;
+      }
+
+   } else {
+
+      /* restore */
+      UInt32        c_calculatedBlockCRC = s->calculatedBlockCRC;
+      UChar         c_state_out_ch       = s->state_out_ch;
+      Int32         c_state_out_len      = s->state_out_len;
+      Int32         c_nblock_used        = s->nblock_used;
+      Int32         c_k0                 = s->k0;
+      UInt32*       c_tt                 = s->tt;
+      UInt32        c_tPos               = s->tPos;
+      char*         cs_next_out          = s->strm->next_out;
+      unsigned int  cs_avail_out         = s->strm->avail_out;
+      /* end restore */
+
+      UInt32       avail_out_INIT = cs_avail_out;
+      Int32        s_save_nblockPP = s->save_nblock+1;
+      unsigned int total_out_lo32_old;
+
+      while (True) {
+
+         /* try to finish existing run */
+         if (c_state_out_len > 0) {
+            while (True) {
+               if (cs_avail_out == 0) goto return_notr;
+               if (c_state_out_len == 1) break;
+               *( (UChar*)(cs_next_out) ) = c_state_out_ch;
+               BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch );
+               c_state_out_len--;
+               cs_next_out++;
+               cs_avail_out--;
+            }
+            s_state_out_len_eq_one:
+            {
+               if (cs_avail_out == 0) { 
+                  c_state_out_len = 1; goto return_notr;
+               };
+               *( (UChar*)(cs_next_out) ) = c_state_out_ch;
+               BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch );
+               cs_next_out++;
+               cs_avail_out--;
+            }
+         }   
+         /* can a new run be started? */
+         if (c_nblock_used == s_save_nblockPP) {
+            c_state_out_len = 0; goto return_notr;
+         };   
+         c_state_out_ch = c_k0;
+         BZ_GET_FAST_C(k1); c_nblock_used++;
+         if (k1 != c_k0) { 
+            c_k0 = k1; goto s_state_out_len_eq_one; 
+         };
+         if (c_nblock_used == s_save_nblockPP) 
+            goto s_state_out_len_eq_one;
+   
+         c_state_out_len = 2;
+         BZ_GET_FAST_C(k1); c_nblock_used++;
+         if (c_nblock_used == s_save_nblockPP) continue;
+         if (k1 != c_k0) { c_k0 = k1; continue; };
+   
+         c_state_out_len = 3;
+         BZ_GET_FAST_C(k1); c_nblock_used++;
+         if (c_nblock_used == s_save_nblockPP) continue;
+         if (k1 != c_k0) { c_k0 = k1; continue; };
+   
+         BZ_GET_FAST_C(k1); c_nblock_used++;
+         c_state_out_len = ((Int32)k1) + 4;
+         BZ_GET_FAST_C(c_k0); c_nblock_used++;
+      }
+
+      return_notr:
+      total_out_lo32_old = s->strm->total_out_lo32;
+      s->strm->total_out_lo32 += (avail_out_INIT - cs_avail_out);
+      if (s->strm->total_out_lo32 < total_out_lo32_old)
+         s->strm->total_out_hi32++;
+
+      /* save */
+      s->calculatedBlockCRC = c_calculatedBlockCRC;
+      s->state_out_ch       = c_state_out_ch;
+      s->state_out_len      = c_state_out_len;
+      s->nblock_used        = c_nblock_used;
+      s->k0                 = c_k0;
+      s->tt                 = c_tt;
+      s->tPos               = c_tPos;
+      s->strm->next_out     = cs_next_out;
+      s->strm->avail_out    = cs_avail_out;
+      /* end save */
+   }
+}
+
+
+
+/*---------------------------------------------------*/
+__inline__ Int32 BZ2_indexIntoF ( Int32 indx, Int32 *cftab )
+{
+   Int32 nb, na, mid;
+   nb = 0;
+   na = 256;
+   do {
+      mid = (nb + na) >> 1;
+      if (indx >= cftab[mid]) nb = mid; else na = mid;
+   }
+   while (na - nb != 1);
+   return nb;
+}
+
+
+/*---------------------------------------------------*/
+static
+void unRLE_obuf_to_output_SMALL ( DState* s )
+{
+   UChar k1;
+
+   if (s->blockRandomised) {
+
+      while (True) {
+         /* try to finish existing run */
+         while (True) {
+            if (s->strm->avail_out == 0) return;
+            if (s->state_out_len == 0) break;
+            *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
+            BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
+            s->state_out_len--;
+            s->strm->next_out++;
+            s->strm->avail_out--;
+            s->strm->total_out_lo32++;
+            if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
+         }
+   
+         /* can a new run be started? */
+         if (s->nblock_used == s->save_nblock+1) return;
+               
+   
+         s->state_out_len = 1;
+         s->state_out_ch = s->k0;
+         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 2;
+         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 3;
+         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK; 
+         k1 ^= BZ_RAND_MASK; s->nblock_used++;
+         s->state_out_len = ((Int32)k1) + 4;
+         BZ_GET_SMALL(s->k0); BZ_RAND_UPD_MASK; 
+         s->k0 ^= BZ_RAND_MASK; s->nblock_used++;
+      }
+
+   } else {
+
+      while (True) {
+         /* try to finish existing run */
+         while (True) {
+            if (s->strm->avail_out == 0) return;
+            if (s->state_out_len == 0) break;
+            *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
+            BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
+            s->state_out_len--;
+            s->strm->next_out++;
+            s->strm->avail_out--;
+            s->strm->total_out_lo32++;
+            if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
+         }
+   
+         /* can a new run be started? */
+         if (s->nblock_used == s->save_nblock+1) return;
+   
+         s->state_out_len = 1;
+         s->state_out_ch = s->k0;
+         BZ_GET_SMALL(k1); s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 2;
+         BZ_GET_SMALL(k1); s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         s->state_out_len = 3;
+         BZ_GET_SMALL(k1); s->nblock_used++;
+         if (s->nblock_used == s->save_nblock+1) continue;
+         if (k1 != s->k0) { s->k0 = k1; continue; };
+   
+         BZ_GET_SMALL(k1); s->nblock_used++;
+         s->state_out_len = ((Int32)k1) + 4;
+         BZ_GET_SMALL(s->k0); s->nblock_used++;
+      }
+
+   }
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzDecompress) ( bz_stream *strm )
+{
+   DState* s;
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   s = strm->state;
+   if (s == NULL) return BZ_PARAM_ERROR;
+   if (s->strm != strm) return BZ_PARAM_ERROR;
+
+   while (True) {
+      if (s->state == BZ_X_IDLE) return BZ_SEQUENCE_ERROR;
+      if (s->state == BZ_X_OUTPUT) {
+         if (s->smallDecompress)
+            unRLE_obuf_to_output_SMALL ( s ); else
+            unRLE_obuf_to_output_FAST  ( s );
+         if (s->nblock_used == s->save_nblock+1 && s->state_out_len == 0) {
+            BZ_FINALISE_CRC ( s->calculatedBlockCRC );
+            if (s->verbosity >= 3) 
+               VPrintf2 ( " {0x%x, 0x%x}", s->storedBlockCRC, 
+                          s->calculatedBlockCRC );
+            if (s->verbosity >= 2) VPrintf0 ( "]" );
+            if (s->calculatedBlockCRC != s->storedBlockCRC)
+               return BZ_DATA_ERROR;
+            s->calculatedCombinedCRC 
+               = (s->calculatedCombinedCRC << 1) | 
+                    (s->calculatedCombinedCRC >> 31);
+            s->calculatedCombinedCRC ^= s->calculatedBlockCRC;
+            s->state = BZ_X_BLKHDR_1;
+         } else {
+            return BZ_OK;
+         }
+      }
+      if (s->state >= BZ_X_MAGIC_1) {
+         Int32 r = BZ2_decompress ( s );
+         if (r == BZ_STREAM_END) {
+            if (s->verbosity >= 3)
+               VPrintf2 ( "\n    combined CRCs: stored = 0x%x, computed = 0x%x", 
+                          s->storedCombinedCRC, s->calculatedCombinedCRC );
+            if (s->calculatedCombinedCRC != s->storedCombinedCRC)
+               return BZ_DATA_ERROR;
+            return r;
+         }
+         if (s->state != BZ_X_OUTPUT) return r;
+      }
+   }
+
+   AssertH ( 0, 6001 );
+
+   return 0;  /*NOTREACHED*/
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzDecompressEnd)  ( bz_stream *strm )
+{
+   DState* s;
+   if (strm == NULL) return BZ_PARAM_ERROR;
+   s = strm->state;
+   if (s == NULL) return BZ_PARAM_ERROR;
+   if (s->strm != strm) return BZ_PARAM_ERROR;
+
+   if (s->tt   != NULL) BZFREE(s->tt);
+   if (s->ll16 != NULL) BZFREE(s->ll16);
+   if (s->ll4  != NULL) BZFREE(s->ll4);
+
+   BZFREE(strm->state);
+   strm->state = NULL;
+
+   return BZ_OK;
+}
+
+
+#ifndef BZ_NO_STDIO
+/*---------------------------------------------------*/
+/*--- File I/O stuff                              ---*/
+/*---------------------------------------------------*/
+
+#define BZ_SETERR(eee)                    \
+{                                         \
+   if (bzerror != NULL) *bzerror = eee;   \
+   if (bzf != NULL) bzf->lastErr = eee;   \
+}
+
+typedef 
+   struct {
+      FILE*     handle;
+      Char      buf[BZ_MAX_UNUSED];
+      Int32     bufN;
+      Bool      writing;
+      bz_stream strm;
+      Int32     lastErr;
+      Bool      initialisedOk;
+   }
+   bzFile;
+
+
+/*---------------------------------------------*/
+static Bool myfeof ( FILE* f )
+{
+   Int32 c = fgetc ( f );
+   if (c == EOF) return True;
+   ungetc ( c, f );
+   return False;
+}
+
+
+/*---------------------------------------------------*/
+BZFILE* BZ_API(BZ2_bzWriteOpen) 
+                    ( int*  bzerror,      
+                      FILE* f, 
+                      int   blockSize100k, 
+                      int   verbosity,
+                      int   workFactor )
+{
+   Int32   ret;
+   bzFile* bzf = NULL;
+
+   BZ_SETERR(BZ_OK);
+
+   if (f == NULL ||
+       (blockSize100k < 1 || blockSize100k > 9) ||
+       (workFactor < 0 || workFactor > 250) ||
+       (verbosity < 0 || verbosity > 4))
+      { BZ_SETERR(BZ_PARAM_ERROR); return NULL; };
+
+   if (ferror(f))
+      { BZ_SETERR(BZ_IO_ERROR); return NULL; };
+
+   bzf = malloc ( sizeof(bzFile) );
+   if (bzf == NULL)
+      { BZ_SETERR(BZ_MEM_ERROR); return NULL; };
+
+   BZ_SETERR(BZ_OK);
+   bzf->initialisedOk = False;
+   bzf->bufN          = 0;
+   bzf->handle        = f;
+   bzf->writing       = True;
+   bzf->strm.bzalloc  = NULL;
+   bzf->strm.bzfree   = NULL;
+   bzf->strm.opaque   = NULL;
+
+   if (workFactor == 0) workFactor = 30;
+   ret = BZ2_bzCompressInit ( &(bzf->strm), blockSize100k, 
+                              verbosity, workFactor );
+   if (ret != BZ_OK)
+      { BZ_SETERR(ret); free(bzf); return NULL; };
+
+   bzf->strm.avail_in = 0;
+   bzf->initialisedOk = True;
+   return bzf;   
+}
+
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzWrite)
+             ( int*    bzerror, 
+               BZFILE* b, 
+               void*   buf, 
+               int     len )
+{
+   Int32 n, n2, ret;
+   bzFile* bzf = (bzFile*)b;
+
+   BZ_SETERR(BZ_OK);
+   if (bzf == NULL || buf == NULL || len < 0)
+      { BZ_SETERR(BZ_PARAM_ERROR); return; };
+   if (!(bzf->writing))
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
+   if (ferror(bzf->handle))
+      { BZ_SETERR(BZ_IO_ERROR); return; };
+
+   if (len == 0)
+      { BZ_SETERR(BZ_OK); return; };
+
+   bzf->strm.avail_in = len;
+   bzf->strm.next_in  = buf;
+
+   while (True) {
+      bzf->strm.avail_out = BZ_MAX_UNUSED;
+      bzf->strm.next_out = bzf->buf;
+      ret = BZ2_bzCompress ( &(bzf->strm), BZ_RUN );
+      if (ret != BZ_RUN_OK)
+         { BZ_SETERR(ret); return; };
+
+      if (bzf->strm.avail_out < BZ_MAX_UNUSED) {
+         n = BZ_MAX_UNUSED - bzf->strm.avail_out;
+         n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar), 
+                       n, bzf->handle );
+         if (n != n2 || ferror(bzf->handle))
+            { BZ_SETERR(BZ_IO_ERROR); return; };
+      }
+
+      if (bzf->strm.avail_in == 0)
+         { BZ_SETERR(BZ_OK); return; };
+   }
+}
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzWriteClose)
+                  ( int*          bzerror, 
+                    BZFILE*       b, 
+                    int           abandon,
+                    unsigned int* nbytes_in,
+                    unsigned int* nbytes_out )
+{
+   BZ2_bzWriteClose64 ( bzerror, b, abandon, 
+                        nbytes_in, NULL, nbytes_out, NULL );
+}
+
+
+void BZ_API(BZ2_bzWriteClose64)
+                  ( int*          bzerror, 
+                    BZFILE*       b, 
+                    int           abandon,
+                    unsigned int* nbytes_in_lo32,
+                    unsigned int* nbytes_in_hi32,
+                    unsigned int* nbytes_out_lo32,
+                    unsigned int* nbytes_out_hi32 )
+{
+   Int32   n, n2, ret;
+   bzFile* bzf = (bzFile*)b;
+
+   if (bzf == NULL)
+      { BZ_SETERR(BZ_OK); return; };
+   if (!(bzf->writing))
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
+   if (ferror(bzf->handle))
+      { BZ_SETERR(BZ_IO_ERROR); return; };
+
+   if (nbytes_in_lo32 != NULL) *nbytes_in_lo32 = 0;
+   if (nbytes_in_hi32 != NULL) *nbytes_in_hi32 = 0;
+   if (nbytes_out_lo32 != NULL) *nbytes_out_lo32 = 0;
+   if (nbytes_out_hi32 != NULL) *nbytes_out_hi32 = 0;
+
+   if ((!abandon) && bzf->lastErr == BZ_OK) {
+      while (True) {
+         bzf->strm.avail_out = BZ_MAX_UNUSED;
+         bzf->strm.next_out = bzf->buf;
+         ret = BZ2_bzCompress ( &(bzf->strm), BZ_FINISH );
+         if (ret != BZ_FINISH_OK && ret != BZ_STREAM_END)
+            { BZ_SETERR(ret); return; };
+
+         if (bzf->strm.avail_out < BZ_MAX_UNUSED) {
+            n = BZ_MAX_UNUSED - bzf->strm.avail_out;
+            n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar), 
+                          n, bzf->handle );
+            if (n != n2 || ferror(bzf->handle))
+               { BZ_SETERR(BZ_IO_ERROR); return; };
+         }
+
+         if (ret == BZ_STREAM_END) break;
+      }
+   }
+
+   if ( !abandon && !ferror ( bzf->handle ) ) {
+      fflush ( bzf->handle );
+      if (ferror(bzf->handle))
+         { BZ_SETERR(BZ_IO_ERROR); return; };
+   }
+
+   if (nbytes_in_lo32 != NULL)
+      *nbytes_in_lo32 = bzf->strm.total_in_lo32;
+   if (nbytes_in_hi32 != NULL)
+      *nbytes_in_hi32 = bzf->strm.total_in_hi32;
+   if (nbytes_out_lo32 != NULL)
+      *nbytes_out_lo32 = bzf->strm.total_out_lo32;
+   if (nbytes_out_hi32 != NULL)
+      *nbytes_out_hi32 = bzf->strm.total_out_hi32;
+
+   BZ_SETERR(BZ_OK);
+   BZ2_bzCompressEnd ( &(bzf->strm) );
+   free ( bzf );
+}
+
+
+/*---------------------------------------------------*/
+BZFILE* BZ_API(BZ2_bzReadOpen) 
+                   ( int*  bzerror, 
+                     FILE* f, 
+                     int   verbosity,
+                     int   small,
+                     void* unused,
+                     int   nUnused )
+{
+   bzFile* bzf = NULL;
+   int     ret;
+
+   BZ_SETERR(BZ_OK);
+
+   if (f == NULL || 
+       (small != 0 && small != 1) ||
+       (verbosity < 0 || verbosity > 4) ||
+       (unused == NULL && nUnused != 0) ||
+       (unused != NULL && (nUnused < 0 || nUnused > BZ_MAX_UNUSED)))
+      { BZ_SETERR(BZ_PARAM_ERROR); return NULL; };
+
+   if (ferror(f))
+      { BZ_SETERR(BZ_IO_ERROR); return NULL; };
+
+   bzf = malloc ( sizeof(bzFile) );
+   if (bzf == NULL) 
+      { BZ_SETERR(BZ_MEM_ERROR); return NULL; };
+
+   BZ_SETERR(BZ_OK);
+
+   bzf->initialisedOk = False;
+   bzf->handle        = f;
+   bzf->bufN          = 0;
+   bzf->writing       = False;
+   bzf->strm.bzalloc  = NULL;
+   bzf->strm.bzfree   = NULL;
+   bzf->strm.opaque   = NULL;
+   
+   while (nUnused > 0) {
+      bzf->buf[bzf->bufN] = *((UChar*)(unused)); bzf->bufN++;
+      unused = ((void*)( 1 + ((UChar*)(unused))  ));
+      nUnused--;
+   }
+
+   ret = BZ2_bzDecompressInit ( &(bzf->strm), verbosity, small );
+   if (ret != BZ_OK)
+      { BZ_SETERR(ret); free(bzf); return NULL; };
+
+   bzf->strm.avail_in = bzf->bufN;
+   bzf->strm.next_in  = bzf->buf;
+
+   bzf->initialisedOk = True;
+   return bzf;   
+}
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzReadClose) ( int *bzerror, BZFILE *b )
+{
+   bzFile* bzf = (bzFile*)b;
+
+   BZ_SETERR(BZ_OK);
+   if (bzf == NULL)
+      { BZ_SETERR(BZ_OK); return; };
+
+   if (bzf->writing)
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
+
+   if (bzf->initialisedOk)
+      (void)BZ2_bzDecompressEnd ( &(bzf->strm) );
+   free ( bzf );
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzRead) 
+           ( int*    bzerror, 
+             BZFILE* b, 
+             void*   buf, 
+             int     len )
+{
+   Int32   n, ret;
+   bzFile* bzf = (bzFile*)b;
+
+   BZ_SETERR(BZ_OK);
+
+   if (bzf == NULL || buf == NULL || len < 0)
+      { BZ_SETERR(BZ_PARAM_ERROR); return 0; };
+
+   if (bzf->writing)
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return 0; };
+
+   if (len == 0)
+      { BZ_SETERR(BZ_OK); return 0; };
+
+   bzf->strm.avail_out = len;
+   bzf->strm.next_out = buf;
+
+   while (True) {
+
+      if (ferror(bzf->handle)) 
+         { BZ_SETERR(BZ_IO_ERROR); return 0; };
+
+      if (bzf->strm.avail_in == 0 && !myfeof(bzf->handle)) {
+         n = fread ( bzf->buf, sizeof(UChar), 
+                     BZ_MAX_UNUSED, bzf->handle );
+         if (ferror(bzf->handle))
+            { BZ_SETERR(BZ_IO_ERROR); return 0; };
+         bzf->bufN = n;
+         bzf->strm.avail_in = bzf->bufN;
+         bzf->strm.next_in = bzf->buf;
+      }
+
+      ret = BZ2_bzDecompress ( &(bzf->strm) );
+
+      if (ret != BZ_OK && ret != BZ_STREAM_END)
+         { BZ_SETERR(ret); return 0; };
+
+      if (ret == BZ_OK && myfeof(bzf->handle) && 
+          bzf->strm.avail_in == 0 && bzf->strm.avail_out > 0)
+         { BZ_SETERR(BZ_UNEXPECTED_EOF); return 0; };
+
+      if (ret == BZ_STREAM_END)
+         { BZ_SETERR(BZ_STREAM_END);
+           return len - bzf->strm.avail_out; };
+      if (bzf->strm.avail_out == 0)
+         { BZ_SETERR(BZ_OK); return len; };
+      
+   }
+
+   return 0; /*not reached*/
+}
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzReadGetUnused) 
+                     ( int*    bzerror, 
+                       BZFILE* b, 
+                       void**  unused, 
+                       int*    nUnused )
+{
+   bzFile* bzf = (bzFile*)b;
+   if (bzf == NULL)
+      { BZ_SETERR(BZ_PARAM_ERROR); return; };
+   if (bzf->lastErr != BZ_STREAM_END)
+      { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
+   if (unused == NULL || nUnused == NULL)
+      { BZ_SETERR(BZ_PARAM_ERROR); return; };
+
+   BZ_SETERR(BZ_OK);
+   *nUnused = bzf->strm.avail_in;
+   *unused = bzf->strm.next_in;
+}
+#endif
+
+
+/*---------------------------------------------------*/
+/*--- Misc convenience stuff                      ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzBuffToBuffCompress) 
+                         ( char*         dest, 
+                           unsigned int* destLen,
+                           char*         source, 
+                           unsigned int  sourceLen,
+                           int           blockSize100k, 
+                           int           verbosity, 
+                           int           workFactor )
+{
+   bz_stream strm;
+   int ret;
+
+   if (dest == NULL || destLen == NULL || 
+       source == NULL ||
+       blockSize100k < 1 || blockSize100k > 9 ||
+       verbosity < 0 || verbosity > 4 ||
+       workFactor < 0 || workFactor > 250) 
+      return BZ_PARAM_ERROR;
+
+   if (workFactor == 0) workFactor = 30;
+   strm.bzalloc = NULL;
+   strm.bzfree = NULL;
+   strm.opaque = NULL;
+   ret = BZ2_bzCompressInit ( &strm, blockSize100k, 
+                              verbosity, workFactor );
+   if (ret != BZ_OK) return ret;
+
+   strm.next_in = source;
+   strm.next_out = dest;
+   strm.avail_in = sourceLen;
+   strm.avail_out = *destLen;
+
+   ret = BZ2_bzCompress ( &strm, BZ_FINISH );
+   if (ret == BZ_FINISH_OK) goto output_overflow;
+   if (ret != BZ_STREAM_END) goto errhandler;
+
+   /* normal termination */
+   *destLen -= strm.avail_out;   
+   BZ2_bzCompressEnd ( &strm );
+   return BZ_OK;
+
+   output_overflow:
+   BZ2_bzCompressEnd ( &strm );
+   return BZ_OUTBUFF_FULL;
+
+   errhandler:
+   BZ2_bzCompressEnd ( &strm );
+   return ret;
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzBuffToBuffDecompress) 
+                           ( char*         dest, 
+                             unsigned int* destLen,
+                             char*         source, 
+                             unsigned int  sourceLen,
+                             int           small,
+                             int           verbosity )
+{
+   bz_stream strm;
+   int ret;
+
+   if (dest == NULL || destLen == NULL || 
+       source == NULL ||
+       (small != 0 && small != 1) ||
+       verbosity < 0 || verbosity > 4) 
+          return BZ_PARAM_ERROR;
+
+   strm.bzalloc = NULL;
+   strm.bzfree = NULL;
+   strm.opaque = NULL;
+   ret = BZ2_bzDecompressInit ( &strm, verbosity, small );
+   if (ret != BZ_OK) return ret;
+
+   strm.next_in = source;
+   strm.next_out = dest;
+   strm.avail_in = sourceLen;
+   strm.avail_out = *destLen;
+
+   ret = BZ2_bzDecompress ( &strm );
+   if (ret == BZ_OK) goto output_overflow_or_eof;
+   if (ret != BZ_STREAM_END) goto errhandler;
+
+   /* normal termination */
+   *destLen -= strm.avail_out;
+   BZ2_bzDecompressEnd ( &strm );
+   return BZ_OK;
+
+   output_overflow_or_eof:
+   if (strm.avail_out > 0) {
+      BZ2_bzDecompressEnd ( &strm );
+      return BZ_UNEXPECTED_EOF;
+   } else {
+      BZ2_bzDecompressEnd ( &strm );
+      return BZ_OUTBUFF_FULL;
+   };      
+
+   errhandler:
+   BZ2_bzDecompressEnd ( &strm );
+   return ret; 
+}
+
+
+/*---------------------------------------------------*/
+/*--
+   Code contributed by Yoshioka Tsuneo
+   (QWF00133@niftyserve.or.jp/tsuneo-y@is.aist-nara.ac.jp),
+   to support better zlib compatibility.
+   This code is not _officially_ part of libbzip2 (yet);
+   I haven't tested it, documented it, or considered the
+   threading-safeness of it.
+   If this code breaks, please contact both Yoshioka and me.
+--*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+/*--
+   return version like "0.9.0c".
+--*/
+const char * BZ_API(BZ2_bzlibVersion)(void)
+{
+   return BZ_VERSION;
+}
+
+
+#ifndef BZ_NO_STDIO
+/*---------------------------------------------------*/
+
+#if defined(_WIN32) || defined(OS2) || defined(MSDOS)
+#   include <fcntl.h>
+#   include <io.h>
+#   define SET_BINARY_MODE(file) setmode(fileno(file),O_BINARY)
+#else
+#   define SET_BINARY_MODE(file)
+#endif
+static
+BZFILE * bzopen_or_bzdopen
+               ( const char *path,   /* no use when bzdopen */
+                 int fd,             /* no use when bzdopen */
+                 const char *mode,
+                 int open_mode)      /* bzopen: 0, bzdopen:1 */
+{
+   int    bzerr;
+   char   unused[BZ_MAX_UNUSED];
+   int    blockSize100k = 9;
+   int    writing       = 0;
+   char   mode2[10]     = "";
+   FILE   *fp           = NULL;
+   BZFILE *bzfp         = NULL;
+   int    verbosity     = 0;
+   int    workFactor    = 30;
+   int    smallMode     = 0;
+   int    nUnused       = 0; 
+
+   if (mode == NULL) return NULL;
+   while (*mode) {
+      switch (*mode) {
+      case 'r':
+         writing = 0; break;
+      case 'w':
+         writing = 1; break;
+      case 's':
+         smallMode = 1; break;
+      default:
+         if (isdigit((int)(*mode))) {
+            blockSize100k = *mode-'0';
+         }
+      }
+      mode++;
+   }
+   strcat(mode2, writing ? "w" : "r" );
+   strcat(mode2,"b");   /* binary mode */
+
+   if (open_mode==0) {
+      if (path==NULL || strcmp(path,"")==0) {
+        fp = (writing ? stdout : stdin);
+        SET_BINARY_MODE(fp);
+      } else {
+        fp = fopen(path,mode2);
+      }
+   } else {
+#ifdef BZ_STRICT_ANSI
+      fp = NULL;
+#else
+      fp = fdopen(fd,mode2);
+#endif
+   }
+   if (fp == NULL) return NULL;
+
+   if (writing) {
+      /* Guard against total chaos and anarchy -- JRS */
+      if (blockSize100k < 1) blockSize100k = 1;
+      if (blockSize100k > 9) blockSize100k = 9; 
+      bzfp = BZ2_bzWriteOpen(&bzerr,fp,blockSize100k,
+                             verbosity,workFactor);
+   } else {
+      bzfp = BZ2_bzReadOpen(&bzerr,fp,verbosity,smallMode,
+                            unused,nUnused);
+   }
+   if (bzfp == NULL) {
+      if (fp != stdin && fp != stdout) fclose(fp);
+      return NULL;
+   }
+   return bzfp;
+}
+
+
+/*---------------------------------------------------*/
+/*--
+   open file for read or write.
+      ex) bzopen("file","w9")
+      case path="" or NULL => use stdin or stdout.
+--*/
+BZFILE * BZ_API(BZ2_bzopen)
+               ( const char *path,
+                 const char *mode )
+{
+   return bzopen_or_bzdopen(path,-1,mode,/*bzopen*/0);
+}
+
+
+/*---------------------------------------------------*/
+BZFILE * BZ_API(BZ2_bzdopen)
+               ( int fd,
+                 const char *mode )
+{
+   return bzopen_or_bzdopen(NULL,fd,mode,/*bzdopen*/1);
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzread) (BZFILE* b, void* buf, int len )
+{
+   int bzerr, nread;
+   if (((bzFile*)b)->lastErr == BZ_STREAM_END) return 0;
+   nread = BZ2_bzRead(&bzerr,b,buf,len);
+   if (bzerr == BZ_OK || bzerr == BZ_STREAM_END) {
+      return nread;
+   } else {
+      return -1;
+   }
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzwrite) (BZFILE* b, void* buf, int len )
+{
+   int bzerr;
+
+   BZ2_bzWrite(&bzerr,b,buf,len);
+   if(bzerr == BZ_OK){
+      return len;
+   }else{
+      return -1;
+   }
+}
+
+
+/*---------------------------------------------------*/
+int BZ_API(BZ2_bzflush) (BZFILE *b)
+{
+   /* do nothing now... */
+   return 0;
+}
+
+
+/*---------------------------------------------------*/
+void BZ_API(BZ2_bzclose) (BZFILE* b)
+{
+   int bzerr;
+   FILE *fp = ((bzFile *)b)->handle;
+   
+   if (b==NULL) {return;}
+   if(((bzFile*)b)->writing){
+      BZ2_bzWriteClose(&bzerr,b,0,NULL,NULL);
+      if(bzerr != BZ_OK){
+         BZ2_bzWriteClose(NULL,b,1,NULL,NULL);
+      }
+   }else{
+      BZ2_bzReadClose(&bzerr,b);
+   }
+   if(fp!=stdin && fp!=stdout){
+      fclose(fp);
+   }
+}
+
+
+/*---------------------------------------------------*/
+/*--
+   return last error code 
+--*/
+static char *bzerrorstrings[] = {
+       "OK"
+      ,"SEQUENCE_ERROR"
+      ,"PARAM_ERROR"
+      ,"MEM_ERROR"
+      ,"DATA_ERROR"
+      ,"DATA_ERROR_MAGIC"
+      ,"IO_ERROR"
+      ,"UNEXPECTED_EOF"
+      ,"OUTBUFF_FULL"
+      ,"CONFIG_ERROR"
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+};
+
+
+const char * BZ_API(BZ2_bzerror) (BZFILE *b, int *errnum)
+{
+   int err = ((bzFile *)b)->lastErr;
+
+   if(err>0) err = 0;
+   *errnum = err;
+   return bzerrorstrings[err*-1];
+}
+#endif
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                           bzlib.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/winsup/bz2lib/bzlib.h b/winsup/bz2lib/bzlib.h
new file mode 100644
index 000000000..c9447a295
--- /dev/null
+++ b/winsup/bz2lib/bzlib.h
@@ -0,0 +1,319 @@
+
+/*-------------------------------------------------------------*/
+/*--- Public header file for the library.                   ---*/
+/*---                                               bzlib.h ---*/
+/*-------------------------------------------------------------*/
+
+/*--
+  This file is a part of bzip2 and/or libbzip2, a program and
+  library for lossless, block-sorting data compression.
+
+  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+  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. 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.
+
+  3. Altered source versions must be plainly marked as such, and must
+     not be misrepresented as being the original software.
+
+  4. 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.
+
+  Julian Seward, Cambridge, UK.
+  jseward@acm.org
+  bzip2/libbzip2 version 1.0 of 21 March 2000
+
+  This program is based on (at least) the work of:
+     Mike Burrows
+     David Wheeler
+     Peter Fenwick
+     Alistair Moffat
+     Radford Neal
+     Ian H. Witten
+     Robert Sedgewick
+     Jon L. Bentley
+
+  For more information on these sources, see the manual.
+--*/
+
+
+#ifndef _BZLIB_H
+#define _BZLIB_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define BZ_RUN               0
+#define BZ_FLUSH             1
+#define BZ_FINISH            2
+
+#define BZ_OK                0
+#define BZ_RUN_OK            1
+#define BZ_FLUSH_OK          2
+#define BZ_FINISH_OK         3
+#define BZ_STREAM_END        4
+#define BZ_SEQUENCE_ERROR    (-1)
+#define BZ_PARAM_ERROR       (-2)
+#define BZ_MEM_ERROR         (-3)
+#define BZ_DATA_ERROR        (-4)
+#define BZ_DATA_ERROR_MAGIC  (-5)
+#define BZ_IO_ERROR          (-6)
+#define BZ_UNEXPECTED_EOF    (-7)
+#define BZ_OUTBUFF_FULL      (-8)
+#define BZ_CONFIG_ERROR      (-9)
+
+typedef 
+   struct {
+      char *next_in;
+      unsigned int avail_in;
+      unsigned int total_in_lo32;
+      unsigned int total_in_hi32;
+
+      char *next_out;
+      unsigned int avail_out;
+      unsigned int total_out_lo32;
+      unsigned int total_out_hi32;
+
+      void *state;
+
+      void *(*bzalloc)(void *,int,int);
+      void (*bzfree)(void *,void *);
+      void *opaque;
+   } 
+   bz_stream;
+
+
+#ifndef BZ_IMPORT
+#define BZ_EXPORT
+#endif
+
+#ifdef _WIN32
+#   include <stdio.h>
+#   include <windows.h>
+#   ifdef small
+      /* windows.h define small to char */
+#      undef small
+#   endif
+#   ifdef BZ_EXPORT
+#   define BZ_API(func) WINAPI func
+#   define BZ_EXTERN extern
+#   else
+   /* import windows dll dynamically */
+#   define BZ_API(func) (WINAPI * func)
+#   define BZ_EXTERN
+#   endif
+#else
+#   define BZ_API(func) func
+#   define BZ_EXTERN extern
+#endif
+
+
+/*-- Core (low-level) library functions --*/
+
+BZ_EXTERN int BZ_API(BZ2_bzCompressInit) ( 
+      bz_stream* strm, 
+      int        blockSize100k, 
+      int        verbosity, 
+      int        workFactor 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzCompress) ( 
+      bz_stream* strm, 
+      int action 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzCompressEnd) ( 
+      bz_stream* strm 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzDecompressInit) ( 
+      bz_stream *strm, 
+      int       verbosity, 
+      int       small
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzDecompress) ( 
+      bz_stream* strm 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzDecompressEnd) ( 
+      bz_stream *strm 
+   );
+
+
+
+/*-- High(er) level library functions --*/
+
+#ifndef BZ_NO_STDIO
+#define BZ_MAX_UNUSED 5000
+
+typedef void BZFILE;
+
+BZ_EXTERN BZFILE* BZ_API(BZ2_bzReadOpen) ( 
+      int*  bzerror,   
+      FILE* f, 
+      int   verbosity, 
+      int   small,
+      void* unused,    
+      int   nUnused 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzReadClose) ( 
+      int*    bzerror, 
+      BZFILE* b 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzReadGetUnused) ( 
+      int*    bzerror, 
+      BZFILE* b, 
+      void**  unused,  
+      int*    nUnused 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzRead) ( 
+      int*    bzerror, 
+      BZFILE* b, 
+      void*   buf, 
+      int     len 
+   );
+
+BZ_EXTERN BZFILE* BZ_API(BZ2_bzWriteOpen) ( 
+      int*  bzerror,      
+      FILE* f, 
+      int   blockSize100k, 
+      int   verbosity, 
+      int   workFactor 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzWrite) ( 
+      int*    bzerror, 
+      BZFILE* b, 
+      void*   buf, 
+      int     len 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzWriteClose) ( 
+      int*          bzerror, 
+      BZFILE*       b, 
+      int           abandon, 
+      unsigned int* nbytes_in, 
+      unsigned int* nbytes_out 
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzWriteClose64) ( 
+      int*          bzerror, 
+      BZFILE*       b, 
+      int           abandon, 
+      unsigned int* nbytes_in_lo32, 
+      unsigned int* nbytes_in_hi32, 
+      unsigned int* nbytes_out_lo32, 
+      unsigned int* nbytes_out_hi32
+   );
+#endif
+
+
+/*-- Utility functions --*/
+
+BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffCompress) ( 
+      char*         dest, 
+      unsigned int* destLen,
+      char*         source, 
+      unsigned int  sourceLen,
+      int           blockSize100k, 
+      int           verbosity, 
+      int           workFactor 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzBuffToBuffDecompress) ( 
+      char*         dest, 
+      unsigned int* destLen,
+      char*         source, 
+      unsigned int  sourceLen,
+      int           small, 
+      int           verbosity 
+   );
+
+
+/*--
+   Code contributed by Yoshioka Tsuneo
+   (QWF00133@niftyserve.or.jp/tsuneo-y@is.aist-nara.ac.jp),
+   to support better zlib compatibility.
+   This code is not _officially_ part of libbzip2 (yet);
+   I haven't tested it, documented it, or considered the
+   threading-safeness of it.
+   If this code breaks, please contact both Yoshioka and me.
+--*/
+
+BZ_EXTERN const char * BZ_API(BZ2_bzlibVersion) (
+      void
+   );
+
+#ifndef BZ_NO_STDIO
+BZ_EXTERN BZFILE * BZ_API(BZ2_bzopen) (
+      const char *path,
+      const char *mode
+   );
+
+BZ_EXTERN BZFILE * BZ_API(BZ2_bzdopen) (
+      int        fd,
+      const char *mode
+   );
+         
+BZ_EXTERN int BZ_API(BZ2_bzread) (
+      BZFILE* b, 
+      void* buf, 
+      int len 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzwrite) (
+      BZFILE* b, 
+      void*   buf, 
+      int     len 
+   );
+
+BZ_EXTERN int BZ_API(BZ2_bzflush) (
+      BZFILE* b
+   );
+
+BZ_EXTERN void BZ_API(BZ2_bzclose) (
+      BZFILE* b
+   );
+
+BZ_EXTERN const char * BZ_API(BZ2_bzerror) (
+      BZFILE *b, 
+      int    *errnum
+   );
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+/*-------------------------------------------------------------*/
+/*--- end                                           bzlib.h ---*/
+/*-------------------------------------------------------------*/
diff --git a/winsup/bz2lib/bzlib_private.h b/winsup/bz2lib/bzlib_private.h
new file mode 100644
index 000000000..fb51c7a1d
--- /dev/null
+++ b/winsup/bz2lib/bzlib_private.h
@@ -0,0 +1,530 @@
+
+/*-------------------------------------------------------------*/
+/*--- Private header file for the library.                  ---*/
+/*---                                       bzlib_private.h ---*/
+/*-------------------------------------------------------------*/
+
+/*--
+  This file is a part of bzip2 and/or libbzip2, a program and
+  library for lossless, block-sorting data compression.
+
+  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+  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. 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.
+
+  3. Altered source versions must be plainly marked as such, and must
+     not be misrepresented as being the original software.
+
+  4. 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.
+
+  Julian Seward, Cambridge, UK.
+  jseward@acm.org
+  bzip2/libbzip2 version 1.0 of 21 March 2000
+
+  This program is based on (at least) the work of:
+     Mike Burrows
+     David Wheeler
+     Peter Fenwick
+     Alistair Moffat
+     Radford Neal
+     Ian H. Witten
+     Robert Sedgewick
+     Jon L. Bentley
+
+  For more information on these sources, see the manual.
+--*/
+
+
+#ifndef _BZLIB_PRIVATE_H
+#define _BZLIB_PRIVATE_H
+
+#include <stdlib.h>
+
+#ifndef BZ_NO_STDIO
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#endif
+
+#include "bzlib.h"
+
+
+
+/*-- General stuff. --*/
+
+#define BZ_VERSION  "1.0.1, 23-June-2000"
+
+typedef char            Char;
+typedef unsigned char   Bool;
+typedef unsigned char   UChar;
+typedef int             Int32;
+typedef unsigned int    UInt32;
+typedef short           Int16;
+typedef unsigned short  UInt16;
+
+#define True  ((Bool)1)
+#define False ((Bool)0)
+
+#ifndef __GNUC__
+#define __inline__  /* */
+#endif 
+
+#ifndef BZ_NO_STDIO
+extern void BZ2_bz__AssertH__fail ( int errcode );
+#define AssertH(cond,errcode) \
+   { if (!(cond)) BZ2_bz__AssertH__fail ( errcode ); }
+#if BZ_DEBUG
+#define AssertD(cond,msg) \
+   { if (!(cond)) {       \
+      fprintf ( stderr,   \
+        "\n\nlibbzip2(debug build): internal error\n\t%s\n", msg );\
+      exit(1); \
+   }}
+#else
+#define AssertD(cond,msg) /* */
+#endif
+#define VPrintf0(zf) \
+   fprintf(stderr,zf)
+#define VPrintf1(zf,za1) \
+   fprintf(stderr,zf,za1)
+#define VPrintf2(zf,za1,za2) \
+   fprintf(stderr,zf,za1,za2)
+#define VPrintf3(zf,za1,za2,za3) \
+   fprintf(stderr,zf,za1,za2,za3)
+#define VPrintf4(zf,za1,za2,za3,za4) \
+   fprintf(stderr,zf,za1,za2,za3,za4)
+#define VPrintf5(zf,za1,za2,za3,za4,za5) \
+   fprintf(stderr,zf,za1,za2,za3,za4,za5)
+#else
+extern void bz_internal_error ( int errcode );
+#define AssertH(cond,errcode) \
+   { if (!(cond)) bz_internal_error ( errcode ); }
+#define AssertD(cond,msg) /* */
+#define VPrintf0(zf) /* */
+#define VPrintf1(zf,za1) /* */
+#define VPrintf2(zf,za1,za2) /* */
+#define VPrintf3(zf,za1,za2,za3) /* */
+#define VPrintf4(zf,za1,za2,za3,za4) /* */
+#define VPrintf5(zf,za1,za2,za3,za4,za5) /* */
+#endif
+
+
+#define BZALLOC(nnn) (strm->bzalloc)(strm->opaque,(nnn),1)
+#define BZFREE(ppp)  (strm->bzfree)(strm->opaque,(ppp))
+
+
+/*-- Constants for the back end. --*/
+
+#define BZ_MAX_ALPHA_SIZE 258
+#define BZ_MAX_CODE_LEN    23
+
+#define BZ_RUNA 0
+#define BZ_RUNB 1
+
+#define BZ_N_GROUPS 6
+#define BZ_G_SIZE   50
+#define BZ_N_ITERS  4
+
+#define BZ_MAX_SELECTORS (2 + (900000 / BZ_G_SIZE))
+
+
+
+/*-- Stuff for randomising repetitive blocks. --*/
+
+extern Int32 BZ2_rNums[512];
+
+#define BZ_RAND_DECLS                          \
+   Int32 rNToGo;                               \
+   Int32 rTPos                                 \
+
+#define BZ_RAND_INIT_MASK                      \
+   s->rNToGo = 0;                              \
+   s->rTPos  = 0                               \
+
+#define BZ_RAND_MASK ((s->rNToGo == 1) ? 1 : 0)
+
+#define BZ_RAND_UPD_MASK                       \
+   if (s->rNToGo == 0) {                       \
+      s->rNToGo = BZ2_rNums[s->rTPos];         \
+      s->rTPos++;                              \
+      if (s->rTPos == 512) s->rTPos = 0;       \
+   }                                           \
+   s->rNToGo--;
+
+
+
+/*-- Stuff for doing CRCs. --*/
+
+extern UInt32 BZ2_crc32Table[256];
+
+#define BZ_INITIALISE_CRC(crcVar)              \
+{                                              \
+   crcVar = 0xffffffffL;                       \
+}
+
+#define BZ_FINALISE_CRC(crcVar)                \
+{                                              \
+   crcVar = ~(crcVar);                         \
+}
+
+#define BZ_UPDATE_CRC(crcVar,cha)              \
+{                                              \
+   crcVar = (crcVar << 8) ^                    \
+            BZ2_crc32Table[(crcVar >> 24) ^    \
+                           ((UChar)cha)];      \
+}
+
+
+
+/*-- States and modes for compression. --*/
+
+#define BZ_M_IDLE      1
+#define BZ_M_RUNNING   2
+#define BZ_M_FLUSHING  3
+#define BZ_M_FINISHING 4
+
+#define BZ_S_OUTPUT    1
+#define BZ_S_INPUT     2
+
+#define BZ_N_RADIX 2
+#define BZ_N_QSORT 12
+#define BZ_N_SHELL 18
+#define BZ_N_OVERSHOOT (BZ_N_RADIX + BZ_N_QSORT + BZ_N_SHELL + 2)
+
+
+
+
+/*-- Structure holding all the compression-side stuff. --*/
+
+typedef
+   struct {
+      /* pointer back to the struct bz_stream */
+      bz_stream* strm;
+
+      /* mode this stream is in, and whether inputting */
+      /* or outputting data */
+      Int32    mode;
+      Int32    state;
+
+      /* remembers avail_in when flush/finish requested */
+      UInt32   avail_in_expect;
+
+      /* for doing the block sorting */
+      UInt32*  arr1;
+      UInt32*  arr2;
+      UInt32*  ftab;
+      Int32    origPtr;
+
+      /* aliases for arr1 and arr2 */
+      UInt32*  ptr;
+      UChar*   block;
+      UInt16*  mtfv;
+      UChar*   zbits;
+
+      /* for deciding when to use the fallback sorting algorithm */
+      Int32    workFactor;
+
+      /* run-length-encoding of the input */
+      UInt32   state_in_ch;
+      Int32    state_in_len;
+      BZ_RAND_DECLS;
+
+      /* input and output limits and current posns */
+      Int32    nblock;
+      Int32    nblockMAX;
+      Int32    numZ;
+      Int32    state_out_pos;
+
+      /* map of bytes used in block */
+      Int32    nInUse;
+      Bool     inUse[256];
+      UChar    unseqToSeq[256];
+
+      /* the buffer for bit stream creation */
+      UInt32   bsBuff;
+      Int32    bsLive;
+
+      /* block and combined CRCs */
+      UInt32   blockCRC;
+      UInt32   combinedCRC;
+
+      /* misc administratium */
+      Int32    verbosity;
+      Int32    blockNo;
+      Int32    blockSize100k;
+
+      /* stuff for coding the MTF values */
+      Int32    nMTF;
+      Int32    mtfFreq    [BZ_MAX_ALPHA_SIZE];
+      UChar    selector   [BZ_MAX_SELECTORS];
+      UChar    selectorMtf[BZ_MAX_SELECTORS];
+
+      UChar    len     [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+      Int32    code    [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+      Int32    rfreq   [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+      /* second dimension: only 3 needed; 4 makes index calculations faster */
+      UInt32   len_pack[BZ_MAX_ALPHA_SIZE][4];
+
+   }
+   EState;
+
+
+
+/*-- externs for compression. --*/
+
+extern void 
+BZ2_blockSort ( EState* );
+
+extern void 
+BZ2_compressBlock ( EState*, Bool );
+
+extern void 
+BZ2_bsInitWrite ( EState* );
+
+extern void 
+BZ2_hbAssignCodes ( Int32*, UChar*, Int32, Int32, Int32 );
+
+extern void 
+BZ2_hbMakeCodeLengths ( UChar*, Int32*, Int32, Int32 );
+
+
+
+/*-- states for decompression. --*/
+
+#define BZ_X_IDLE        1
+#define BZ_X_OUTPUT      2
+
+#define BZ_X_MAGIC_1     10
+#define BZ_X_MAGIC_2     11
+#define BZ_X_MAGIC_3     12
+#define BZ_X_MAGIC_4     13
+#define BZ_X_BLKHDR_1    14
+#define BZ_X_BLKHDR_2    15
+#define BZ_X_BLKHDR_3    16
+#define BZ_X_BLKHDR_4    17
+#define BZ_X_BLKHDR_5    18
+#define BZ_X_BLKHDR_6    19
+#define BZ_X_BCRC_1      20
+#define BZ_X_BCRC_2      21
+#define BZ_X_BCRC_3      22
+#define BZ_X_BCRC_4      23
+#define BZ_X_RANDBIT     24
+#define BZ_X_ORIGPTR_1   25
+#define BZ_X_ORIGPTR_2   26
+#define BZ_X_ORIGPTR_3   27
+#define BZ_X_MAPPING_1   28
+#define BZ_X_MAPPING_2   29
+#define BZ_X_SELECTOR_1  30
+#define BZ_X_SELECTOR_2  31
+#define BZ_X_SELECTOR_3  32
+#define BZ_X_CODING_1    33
+#define BZ_X_CODING_2    34
+#define BZ_X_CODING_3    35
+#define BZ_X_MTF_1       36
+#define BZ_X_MTF_2       37
+#define BZ_X_MTF_3       38
+#define BZ_X_MTF_4       39
+#define BZ_X_MTF_5       40
+#define BZ_X_MTF_6       41
+#define BZ_X_ENDHDR_2    42
+#define BZ_X_ENDHDR_3    43
+#define BZ_X_ENDHDR_4    44
+#define BZ_X_ENDHDR_5    45
+#define BZ_X_ENDHDR_6    46
+#define BZ_X_CCRC_1      47
+#define BZ_X_CCRC_2      48
+#define BZ_X_CCRC_3      49
+#define BZ_X_CCRC_4      50
+
+
+
+/*-- Constants for the fast MTF decoder. --*/
+
+#define MTFA_SIZE 4096
+#define MTFL_SIZE 16
+
+
+
+/*-- Structure holding all the decompression-side stuff. --*/
+
+typedef
+   struct {
+      /* pointer back to the struct bz_stream */
+      bz_stream* strm;
+
+      /* state indicator for this stream */
+      Int32    state;
+
+      /* for doing the final run-length decoding */
+      UChar    state_out_ch;
+      Int32    state_out_len;
+      Bool     blockRandomised;
+      BZ_RAND_DECLS;
+
+      /* the buffer for bit stream reading */
+      UInt32   bsBuff;
+      Int32    bsLive;
+
+      /* misc administratium */
+      Int32    blockSize100k;
+      Bool     smallDecompress;
+      Int32    currBlockNo;
+      Int32    verbosity;
+
+      /* for undoing the Burrows-Wheeler transform */
+      Int32    origPtr;
+      UInt32   tPos;
+      Int32    k0;
+      Int32    unzftab[256];
+      Int32    nblock_used;
+      Int32    cftab[257];
+      Int32    cftabCopy[257];
+
+      /* for undoing the Burrows-Wheeler transform (FAST) */
+      UInt32   *tt;
+
+      /* for undoing the Burrows-Wheeler transform (SMALL) */
+      UInt16   *ll16;
+      UChar    *ll4;
+
+      /* stored and calculated CRCs */
+      UInt32   storedBlockCRC;
+      UInt32   storedCombinedCRC;
+      UInt32   calculatedBlockCRC;
+      UInt32   calculatedCombinedCRC;
+
+      /* map of bytes used in block */
+      Int32    nInUse;
+      Bool     inUse[256];
+      Bool     inUse16[16];
+      UChar    seqToUnseq[256];
+
+      /* for decoding the MTF values */
+      UChar    mtfa   [MTFA_SIZE];
+      Int32    mtfbase[256 / MTFL_SIZE];
+      UChar    selector   [BZ_MAX_SELECTORS];
+      UChar    selectorMtf[BZ_MAX_SELECTORS];
+      UChar    len  [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+
+      Int32    limit  [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+      Int32    base   [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+      Int32    perm   [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+      Int32    minLens[BZ_N_GROUPS];
+
+      /* save area for scalars in the main decompress code */
+      Int32    save_i;
+      Int32    save_j;
+      Int32    save_t;
+      Int32    save_alphaSize;
+      Int32    save_nGroups;
+      Int32    save_nSelectors;
+      Int32    save_EOB;
+      Int32    save_groupNo;
+      Int32    save_groupPos;
+      Int32    save_nextSym;
+      Int32    save_nblockMAX;
+      Int32    save_nblock;
+      Int32    save_es;
+      Int32    save_N;
+      Int32    save_curr;
+      Int32    save_zt;
+      Int32    save_zn; 
+      Int32    save_zvec;
+      Int32    save_zj;
+      Int32    save_gSel;
+      Int32    save_gMinlen;
+      Int32*   save_gLimit;
+      Int32*   save_gBase;
+      Int32*   save_gPerm;
+
+   }
+   DState;
+
+
+
+/*-- Macros for decompression. --*/
+
+#define BZ_GET_FAST(cccc)                     \
+    s->tPos = s->tt[s->tPos];                 \
+    cccc = (UChar)(s->tPos & 0xff);           \
+    s->tPos >>= 8;
+
+#define BZ_GET_FAST_C(cccc)                   \
+    c_tPos = c_tt[c_tPos];                    \
+    cccc = (UChar)(c_tPos & 0xff);            \
+    c_tPos >>= 8;
+
+#define SET_LL4(i,n)                                          \
+   { if (((i) & 0x1) == 0)                                    \
+        s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0xf0) | (n); else    \
+        s->ll4[(i) >> 1] = (s->ll4[(i) >> 1] & 0x0f) | ((n) << 4);  \
+   }
+
+#define GET_LL4(i)                             \
+   ((((UInt32)(s->ll4[(i) >> 1])) >> (((i) << 2) & 0x4)) & 0xF)
+
+#define SET_LL(i,n)                          \
+   { s->ll16[i] = (UInt16)(n & 0x0000ffff);  \
+     SET_LL4(i, n >> 16);                    \
+   }
+
+#define GET_LL(i) \
+   (((UInt32)s->ll16[i]) | (GET_LL4(i) << 16))
+
+#define BZ_GET_SMALL(cccc)                            \
+      cccc = BZ2_indexIntoF ( s->tPos, s->cftab );    \
+      s->tPos = GET_LL(s->tPos);
+
+
+/*-- externs for decompression. --*/
+
+extern Int32 
+BZ2_indexIntoF ( Int32, Int32* );
+
+extern Int32 
+BZ2_decompress ( DState* );
+
+extern void 
+BZ2_hbCreateDecodeTables ( Int32*, Int32*, Int32*, UChar*,
+                           Int32,  Int32, Int32 );
+
+
+#endif
+
+
+/*-- BZ_NO_STDIO seems to make NULL disappear on some platforms. --*/
+
+#ifdef BZ_NO_STDIO
+#ifndef NULL
+#define NULL 0
+#endif
+#endif
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                   bzlib_private.h ---*/
+/*-------------------------------------------------------------*/
diff --git a/winsup/bz2lib/compress.c b/winsup/bz2lib/compress.c
new file mode 100644
index 000000000..cc5e31d6f
--- /dev/null
+++ b/winsup/bz2lib/compress.c
@@ -0,0 +1,714 @@
+
+/*-------------------------------------------------------------*/
+/*--- Compression machinery (not incl block sorting)        ---*/
+/*---                                            compress.c ---*/
+/*-------------------------------------------------------------*/
+
+/*--
+  This file is a part of bzip2 and/or libbzip2, a program and
+  library for lossless, block-sorting data compression.
+
+  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+  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. 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.
+
+  3. Altered source versions must be plainly marked as such, and must
+     not be misrepresented as being the original software.
+
+  4. 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.
+
+  Julian Seward, Cambridge, UK.
+  jseward@acm.org
+  bzip2/libbzip2 version 1.0 of 21 March 2000
+
+  This program is based on (at least) the work of:
+     Mike Burrows
+     David Wheeler
+     Peter Fenwick
+     Alistair Moffat
+     Radford Neal
+     Ian H. Witten
+     Robert Sedgewick
+     Jon L. Bentley
+
+  For more information on these sources, see the manual.
+--*/
+
+/*--
+   CHANGES
+   ~~~~~~~
+   0.9.0 -- original version.
+
+   0.9.0a/b -- no changes in this file.
+
+   0.9.0c
+      * changed setting of nGroups in sendMTFValues() so as to 
+        do a bit better on small files
+--*/
+
+#include "bzlib_private.h"
+
+
+/*---------------------------------------------------*/
+/*--- Bit stream I/O                              ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+void BZ2_bsInitWrite ( EState* s )
+{
+   s->bsLive = 0;
+   s->bsBuff = 0;
+}
+
+
+/*---------------------------------------------------*/
+static
+void bsFinishWrite ( EState* s )
+{
+   while (s->bsLive > 0) {
+      s->zbits[s->numZ] = (UChar)(s->bsBuff >> 24);
+      s->numZ++;
+      s->bsBuff <<= 8;
+      s->bsLive -= 8;
+   }
+}
+
+
+/*---------------------------------------------------*/
+#define bsNEEDW(nz)                           \
+{                                             \
+   while (s->bsLive >= 8) {                   \
+      s->zbits[s->numZ]                       \
+         = (UChar)(s->bsBuff >> 24);          \
+      s->numZ++;                              \
+      s->bsBuff <<= 8;                        \
+      s->bsLive -= 8;                         \
+   }                                          \
+}
+
+
+/*---------------------------------------------------*/
+static
+__inline__
+void bsW ( EState* s, Int32 n, UInt32 v )
+{
+   bsNEEDW ( n );
+   s->bsBuff |= (v << (32 - s->bsLive - n));
+   s->bsLive += n;
+}
+
+
+/*---------------------------------------------------*/
+static
+void bsPutUInt32 ( EState* s, UInt32 u )
+{
+   bsW ( s, 8, (u >> 24) & 0xffL );
+   bsW ( s, 8, (u >> 16) & 0xffL );
+   bsW ( s, 8, (u >>  8) & 0xffL );
+   bsW ( s, 8,  u        & 0xffL );
+}
+
+
+/*---------------------------------------------------*/
+static
+void bsPutUChar ( EState* s, UChar c )
+{
+   bsW( s, 8, (UInt32)c );
+}
+
+
+/*---------------------------------------------------*/
+/*--- The back end proper                         ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+static
+void makeMaps_e ( EState* s )
+{
+   Int32 i;
+   s->nInUse = 0;
+   for (i = 0; i < 256; i++)
+      if (s->inUse[i]) {
+         s->unseqToSeq[i] = s->nInUse;
+         s->nInUse++;
+      }
+}
+
+
+/*---------------------------------------------------*/
+static
+void generateMTFValues ( EState* s )
+{
+   UChar   yy[256];
+   Int32   i, j;
+   Int32   zPend;
+   Int32   wr;
+   Int32   EOB;
+
+   /* 
+      After sorting (eg, here),
+         s->arr1 [ 0 .. s->nblock-1 ] holds sorted order,
+         and
+         ((UChar*)s->arr2) [ 0 .. s->nblock-1 ] 
+         holds the original block data.
+
+      The first thing to do is generate the MTF values,
+      and put them in
+         ((UInt16*)s->arr1) [ 0 .. s->nblock-1 ].
+      Because there are strictly fewer or equal MTF values
+      than block values, ptr values in this area are overwritten
+      with MTF values only when they are no longer needed.
+
+      The final compressed bitstream is generated into the
+      area starting at
+         (UChar*) (&((UChar*)s->arr2)[s->nblock])
+
+      These storage aliases are set up in bzCompressInit(),
+      except for the last one, which is arranged in 
+      compressBlock().
+   */
+   UInt32* ptr   = s->ptr;
+   UChar* block  = s->block;
+   UInt16* mtfv  = s->mtfv;
+
+   makeMaps_e ( s );
+   EOB = s->nInUse+1;
+
+   for (i = 0; i <= EOB; i++) s->mtfFreq[i] = 0;
+
+   wr = 0;
+   zPend = 0;
+   for (i = 0; i < s->nInUse; i++) yy[i] = (UChar) i;
+
+   for (i = 0; i < s->nblock; i++) {
+      UChar ll_i;
+      AssertD ( wr <= i, "generateMTFValues(1)" );
+      j = ptr[i]-1; if (j < 0) j += s->nblock;
+      ll_i = s->unseqToSeq[block[j]];
+      AssertD ( ll_i < s->nInUse, "generateMTFValues(2a)" );
+
+      if (yy[0] == ll_i) { 
+         zPend++;
+      } else {
+
+         if (zPend > 0) {
+            zPend--;
+            while (True) {
+               if (zPend & 1) {
+                  mtfv[wr] = BZ_RUNB; wr++; 
+                  s->mtfFreq[BZ_RUNB]++; 
+               } else {
+                  mtfv[wr] = BZ_RUNA; wr++; 
+                  s->mtfFreq[BZ_RUNA]++; 
+               }
+               if (zPend < 2) break;
+               zPend = (zPend - 2) / 2;
+            };
+            zPend = 0;
+         }
+         {
+            register UChar  rtmp;
+            register UChar* ryy_j;
+            register UChar  rll_i;
+            rtmp  = yy[1];
+            yy[1] = yy[0];
+            ryy_j = &(yy[1]);
+            rll_i = ll_i;
+            while ( rll_i != rtmp ) {
+               register UChar rtmp2;
+               ryy_j++;
+               rtmp2  = rtmp;
+               rtmp   = *ryy_j;
+               *ryy_j = rtmp2;
+            };
+            yy[0] = rtmp;
+            j = ryy_j - &(yy[0]);
+            mtfv[wr] = j+1; wr++; s->mtfFreq[j+1]++;
+         }
+
+      }
+   }
+
+   if (zPend > 0) {
+      zPend--;
+      while (True) {
+         if (zPend & 1) {
+            mtfv[wr] = BZ_RUNB; wr++; 
+            s->mtfFreq[BZ_RUNB]++; 
+         } else {
+            mtfv[wr] = BZ_RUNA; wr++; 
+            s->mtfFreq[BZ_RUNA]++; 
+         }
+         if (zPend < 2) break;
+         zPend = (zPend - 2) / 2;
+      };
+      zPend = 0;
+   }
+
+   mtfv[wr] = EOB; wr++; s->mtfFreq[EOB]++;
+
+   s->nMTF = wr;
+}
+
+
+/*---------------------------------------------------*/
+#define BZ_LESSER_ICOST  0
+#define BZ_GREATER_ICOST 15
+
+static
+void sendMTFValues ( EState* s )
+{
+   Int32 v, t, i, j, gs, ge, totc, bt, bc, iter;
+   Int32 nSelectors, alphaSize, minLen, maxLen, selCtr;
+   Int32 nGroups, nBytes;
+
+   /*--
+   UChar  len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+   is a global since the decoder also needs it.
+
+   Int32  code[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+   Int32  rfreq[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+   are also globals only used in this proc.
+   Made global to keep stack frame size small.
+   --*/
+
+
+   UInt16 cost[BZ_N_GROUPS];
+   Int32  fave[BZ_N_GROUPS];
+
+   UInt16* mtfv = s->mtfv;
+
+   if (s->verbosity >= 3)
+      VPrintf3( "      %d in block, %d after MTF & 1-2 coding, "
+                "%d+2 syms in use\n", 
+                s->nblock, s->nMTF, s->nInUse );
+
+   alphaSize = s->nInUse+2;
+   for (t = 0; t < BZ_N_GROUPS; t++)
+      for (v = 0; v < alphaSize; v++)
+         s->len[t][v] = BZ_GREATER_ICOST;
+
+   /*--- Decide how many coding tables to use ---*/
+   AssertH ( s->nMTF > 0, 3001 );
+   if (s->nMTF < 200)  nGroups = 2; else
+   if (s->nMTF < 600)  nGroups = 3; else
+   if (s->nMTF < 1200) nGroups = 4; else
+   if (s->nMTF < 2400) nGroups = 5; else
+                       nGroups = 6;
+
+   /*--- Generate an initial set of coding tables ---*/
+   { 
+      Int32 nPart, remF, tFreq, aFreq;
+
+      nPart = nGroups;
+      remF  = s->nMTF;
+      gs = 0;
+      while (nPart > 0) {
+         tFreq = remF / nPart;
+         ge = gs-1;
+         aFreq = 0;
+         while (aFreq < tFreq && ge < alphaSize-1) {
+            ge++;
+            aFreq += s->mtfFreq[ge];
+         }
+
+         if (ge > gs 
+             && nPart != nGroups && nPart != 1 
+             && ((nGroups-nPart) % 2 == 1)) {
+            aFreq -= s->mtfFreq[ge];
+            ge--;
+         }
+
+         if (s->verbosity >= 3)
+            VPrintf5( "      initial group %d, [%d .. %d], "
+                      "has %d syms (%4.1f%%)\n",
+                      nPart, gs, ge, aFreq, 
+                      (100.0 * (float)aFreq) / (float)(s->nMTF) );
+ 
+         for (v = 0; v < alphaSize; v++)
+            if (v >= gs && v <= ge) 
+               s->len[nPart-1][v] = BZ_LESSER_ICOST; else
+               s->len[nPart-1][v] = BZ_GREATER_ICOST;
+ 
+         nPart--;
+         gs = ge+1;
+         remF -= aFreq;
+      }
+   }
+
+   /*--- 
+      Iterate up to BZ_N_ITERS times to improve the tables.
+   ---*/
+   for (iter = 0; iter < BZ_N_ITERS; iter++) {
+
+      for (t = 0; t < nGroups; t++) fave[t] = 0;
+
+      for (t = 0; t < nGroups; t++)
+         for (v = 0; v < alphaSize; v++)
+            s->rfreq[t][v] = 0;
+
+      /*---
+        Set up an auxiliary length table which is used to fast-track
+	the common case (nGroups == 6). 
+      ---*/
+      if (nGroups == 6) {
+         for (v = 0; v < alphaSize; v++) {
+            s->len_pack[v][0] = (s->len[1][v] << 16) | s->len[0][v];
+            s->len_pack[v][1] = (s->len[3][v] << 16) | s->len[2][v];
+            s->len_pack[v][2] = (s->len[5][v] << 16) | s->len[4][v];
+	 }
+      }
+
+      nSelectors = 0;
+      totc = 0;
+      gs = 0;
+      while (True) {
+
+         /*--- Set group start & end marks. --*/
+         if (gs >= s->nMTF) break;
+         ge = gs + BZ_G_SIZE - 1; 
+         if (ge >= s->nMTF) ge = s->nMTF-1;
+
+         /*-- 
+            Calculate the cost of this group as coded
+            by each of the coding tables.
+         --*/
+         for (t = 0; t < nGroups; t++) cost[t] = 0;
+
+         if (nGroups == 6 && 50 == ge-gs+1) {
+            /*--- fast track the common case ---*/
+            register UInt32 cost01, cost23, cost45;
+            register UInt16 icv;
+            cost01 = cost23 = cost45 = 0;
+
+#           define BZ_ITER(nn)                \
+               icv = mtfv[gs+(nn)];           \
+               cost01 += s->len_pack[icv][0]; \
+               cost23 += s->len_pack[icv][1]; \
+               cost45 += s->len_pack[icv][2]; \
+
+            BZ_ITER(0);  BZ_ITER(1);  BZ_ITER(2);  BZ_ITER(3);  BZ_ITER(4);
+            BZ_ITER(5);  BZ_ITER(6);  BZ_ITER(7);  BZ_ITER(8);  BZ_ITER(9);
+            BZ_ITER(10); BZ_ITER(11); BZ_ITER(12); BZ_ITER(13); BZ_ITER(14);
+            BZ_ITER(15); BZ_ITER(16); BZ_ITER(17); BZ_ITER(18); BZ_ITER(19);
+            BZ_ITER(20); BZ_ITER(21); BZ_ITER(22); BZ_ITER(23); BZ_ITER(24);
+            BZ_ITER(25); BZ_ITER(26); BZ_ITER(27); BZ_ITER(28); BZ_ITER(29);
+            BZ_ITER(30); BZ_ITER(31); BZ_ITER(32); BZ_ITER(33); BZ_ITER(34);
+            BZ_ITER(35); BZ_ITER(36); BZ_ITER(37); BZ_ITER(38); BZ_ITER(39);
+            BZ_ITER(40); BZ_ITER(41); BZ_ITER(42); BZ_ITER(43); BZ_ITER(44);
+            BZ_ITER(45); BZ_ITER(46); BZ_ITER(47); BZ_ITER(48); BZ_ITER(49);
+
+#           undef BZ_ITER
+
+            cost[0] = cost01 & 0xffff; cost[1] = cost01 >> 16;
+            cost[2] = cost23 & 0xffff; cost[3] = cost23 >> 16;
+            cost[4] = cost45 & 0xffff; cost[5] = cost45 >> 16;
+
+         } else {
+	    /*--- slow version which correctly handles all situations ---*/
+            for (i = gs; i <= ge; i++) { 
+               UInt16 icv = mtfv[i];
+               for (t = 0; t < nGroups; t++) cost[t] += s->len[t][icv];
+            }
+         }
+ 
+         /*-- 
+            Find the coding table which is best for this group,
+            and record its identity in the selector table.
+         --*/
+         bc = 999999999; bt = -1;
+         for (t = 0; t < nGroups; t++)
+            if (cost[t] < bc) { bc = cost[t]; bt = t; };
+         totc += bc;
+         fave[bt]++;
+         s->selector[nSelectors] = bt;
+         nSelectors++;
+
+         /*-- 
+            Increment the symbol frequencies for the selected table.
+          --*/
+         if (nGroups == 6 && 50 == ge-gs+1) {
+            /*--- fast track the common case ---*/
+
+#           define BZ_ITUR(nn) s->rfreq[bt][ mtfv[gs+(nn)] ]++
+
+            BZ_ITUR(0);  BZ_ITUR(1);  BZ_ITUR(2);  BZ_ITUR(3);  BZ_ITUR(4);
+            BZ_ITUR(5);  BZ_ITUR(6);  BZ_ITUR(7);  BZ_ITUR(8);  BZ_ITUR(9);
+            BZ_ITUR(10); BZ_ITUR(11); BZ_ITUR(12); BZ_ITUR(13); BZ_ITUR(14);
+            BZ_ITUR(15); BZ_ITUR(16); BZ_ITUR(17); BZ_ITUR(18); BZ_ITUR(19);
+            BZ_ITUR(20); BZ_ITUR(21); BZ_ITUR(22); BZ_ITUR(23); BZ_ITUR(24);
+            BZ_ITUR(25); BZ_ITUR(26); BZ_ITUR(27); BZ_ITUR(28); BZ_ITUR(29);
+            BZ_ITUR(30); BZ_ITUR(31); BZ_ITUR(32); BZ_ITUR(33); BZ_ITUR(34);
+            BZ_ITUR(35); BZ_ITUR(36); BZ_ITUR(37); BZ_ITUR(38); BZ_ITUR(39);
+            BZ_ITUR(40); BZ_ITUR(41); BZ_ITUR(42); BZ_ITUR(43); BZ_ITUR(44);
+            BZ_ITUR(45); BZ_ITUR(46); BZ_ITUR(47); BZ_ITUR(48); BZ_ITUR(49);
+
+#           undef BZ_ITUR
+
+         } else {
+	    /*--- slow version which correctly handles all situations ---*/
+            for (i = gs; i <= ge; i++)
+               s->rfreq[bt][ mtfv[i] ]++;
+         }
+
+         gs = ge+1;
+      }
+      if (s->verbosity >= 3) {
+         VPrintf2 ( "      pass %d: size is %d, grp uses are ", 
+                   iter+1, totc/8 );
+         for (t = 0; t < nGroups; t++)
+            VPrintf1 ( "%d ", fave[t] );
+         VPrintf0 ( "\n" );
+      }
+
+      /*--
+        Recompute the tables based on the accumulated frequencies.
+      --*/
+      for (t = 0; t < nGroups; t++)
+         BZ2_hbMakeCodeLengths ( &(s->len[t][0]), &(s->rfreq[t][0]), 
+                                 alphaSize, 20 );
+   }
+
+
+   AssertH( nGroups < 8, 3002 );
+   AssertH( nSelectors < 32768 &&
+            nSelectors <= (2 + (900000 / BZ_G_SIZE)),
+            3003 );
+
+
+   /*--- Compute MTF values for the selectors. ---*/
+   {
+      UChar pos[BZ_N_GROUPS], ll_i, tmp2, tmp;
+      for (i = 0; i < nGroups; i++) pos[i] = i;
+      for (i = 0; i < nSelectors; i++) {
+         ll_i = s->selector[i];
+         j = 0;
+         tmp = pos[j];
+         while ( ll_i != tmp ) {
+            j++;
+            tmp2 = tmp;
+            tmp = pos[j];
+            pos[j] = tmp2;
+         };
+         pos[0] = tmp;
+         s->selectorMtf[i] = j;
+      }
+   };
+
+   /*--- Assign actual codes for the tables. --*/
+   for (t = 0; t < nGroups; t++) {
+      minLen = 32;
+      maxLen = 0;
+      for (i = 0; i < alphaSize; i++) {
+         if (s->len[t][i] > maxLen) maxLen = s->len[t][i];
+         if (s->len[t][i] < minLen) minLen = s->len[t][i];
+      }
+      AssertH ( !(maxLen > 20), 3004 );
+      AssertH ( !(minLen < 1),  3005 );
+      BZ2_hbAssignCodes ( &(s->code[t][0]), &(s->len[t][0]), 
+                          minLen, maxLen, alphaSize );
+   }
+
+   /*--- Transmit the mapping table. ---*/
+   { 
+      Bool inUse16[16];
+      for (i = 0; i < 16; i++) {
+          inUse16[i] = False;
+          for (j = 0; j < 16; j++)
+             if (s->inUse[i * 16 + j]) inUse16[i] = True;
+      }
+     
+      nBytes = s->numZ;
+      for (i = 0; i < 16; i++)
+         if (inUse16[i]) bsW(s,1,1); else bsW(s,1,0);
+
+      for (i = 0; i < 16; i++)
+         if (inUse16[i])
+            for (j = 0; j < 16; j++) {
+               if (s->inUse[i * 16 + j]) bsW(s,1,1); else bsW(s,1,0);
+            }
+
+      if (s->verbosity >= 3) 
+         VPrintf1( "      bytes: mapping %d, ", s->numZ-nBytes );
+   }
+
+   /*--- Now the selectors. ---*/
+   nBytes = s->numZ;
+   bsW ( s, 3, nGroups );
+   bsW ( s, 15, nSelectors );
+   for (i = 0; i < nSelectors; i++) { 
+      for (j = 0; j < s->selectorMtf[i]; j++) bsW(s,1,1);
+      bsW(s,1,0);
+   }
+   if (s->verbosity >= 3)
+      VPrintf1( "selectors %d, ", s->numZ-nBytes );
+
+   /*--- Now the coding tables. ---*/
+   nBytes = s->numZ;
+
+   for (t = 0; t < nGroups; t++) {
+      Int32 curr = s->len[t][0];
+      bsW ( s, 5, curr );
+      for (i = 0; i < alphaSize; i++) {
+         while (curr < s->len[t][i]) { bsW(s,2,2); curr++; /* 10 */ };
+         while (curr > s->len[t][i]) { bsW(s,2,3); curr--; /* 11 */ };
+         bsW ( s, 1, 0 );
+      }
+   }
+
+   if (s->verbosity >= 3)
+      VPrintf1 ( "code lengths %d, ", s->numZ-nBytes );
+
+   /*--- And finally, the block data proper ---*/
+   nBytes = s->numZ;
+   selCtr = 0;
+   gs = 0;
+   while (True) {
+      if (gs >= s->nMTF) break;
+      ge = gs + BZ_G_SIZE - 1; 
+      if (ge >= s->nMTF) ge = s->nMTF-1;
+      AssertH ( s->selector[selCtr] < nGroups, 3006 );
+
+      if (nGroups == 6 && 50 == ge-gs+1) {
+            /*--- fast track the common case ---*/
+            UInt16 mtfv_i;
+            UChar* s_len_sel_selCtr 
+               = &(s->len[s->selector[selCtr]][0]);
+            Int32* s_code_sel_selCtr
+               = &(s->code[s->selector[selCtr]][0]);
+
+#           define BZ_ITAH(nn)                      \
+               mtfv_i = mtfv[gs+(nn)];              \
+               bsW ( s,                             \
+                     s_len_sel_selCtr[mtfv_i],      \
+                     s_code_sel_selCtr[mtfv_i] )
+
+            BZ_ITAH(0);  BZ_ITAH(1);  BZ_ITAH(2);  BZ_ITAH(3);  BZ_ITAH(4);
+            BZ_ITAH(5);  BZ_ITAH(6);  BZ_ITAH(7);  BZ_ITAH(8);  BZ_ITAH(9);
+            BZ_ITAH(10); BZ_ITAH(11); BZ_ITAH(12); BZ_ITAH(13); BZ_ITAH(14);
+            BZ_ITAH(15); BZ_ITAH(16); BZ_ITAH(17); BZ_ITAH(18); BZ_ITAH(19);
+            BZ_ITAH(20); BZ_ITAH(21); BZ_ITAH(22); BZ_ITAH(23); BZ_ITAH(24);
+            BZ_ITAH(25); BZ_ITAH(26); BZ_ITAH(27); BZ_ITAH(28); BZ_ITAH(29);
+            BZ_ITAH(30); BZ_ITAH(31); BZ_ITAH(32); BZ_ITAH(33); BZ_ITAH(34);
+            BZ_ITAH(35); BZ_ITAH(36); BZ_ITAH(37); BZ_ITAH(38); BZ_ITAH(39);
+            BZ_ITAH(40); BZ_ITAH(41); BZ_ITAH(42); BZ_ITAH(43); BZ_ITAH(44);
+            BZ_ITAH(45); BZ_ITAH(46); BZ_ITAH(47); BZ_ITAH(48); BZ_ITAH(49);
+
+#           undef BZ_ITAH
+
+      } else {
+	 /*--- slow version which correctly handles all situations ---*/
+         for (i = gs; i <= ge; i++) {
+            bsW ( s, 
+                  s->len  [s->selector[selCtr]] [mtfv[i]],
+                  s->code [s->selector[selCtr]] [mtfv[i]] );
+         }
+      }
+
+
+      gs = ge+1;
+      selCtr++;
+   }
+   AssertH( selCtr == nSelectors, 3007 );
+
+   if (s->verbosity >= 3)
+      VPrintf1( "codes %d\n", s->numZ-nBytes );
+}
+
+
+/*---------------------------------------------------*/
+void BZ2_compressBlock ( EState* s, Bool is_last_block )
+{
+   if (s->nblock > 0) {
+
+      BZ_FINALISE_CRC ( s->blockCRC );
+      s->combinedCRC = (s->combinedCRC << 1) | (s->combinedCRC >> 31);
+      s->combinedCRC ^= s->blockCRC;
+      if (s->blockNo > 1) s->numZ = 0;
+
+      if (s->verbosity >= 2)
+         VPrintf4( "    block %d: crc = 0x%8x, "
+                   "combined CRC = 0x%8x, size = %d\n",
+                   s->blockNo, s->blockCRC, s->combinedCRC, s->nblock );
+
+      BZ2_blockSort ( s );
+   }
+
+   s->zbits = (UChar*) (&((UChar*)s->arr2)[s->nblock]);
+
+   /*-- If this is the first block, create the stream header. --*/
+   if (s->blockNo == 1) {
+      BZ2_bsInitWrite ( s );
+      bsPutUChar ( s, 'B' );
+      bsPutUChar ( s, 'Z' );
+      bsPutUChar ( s, 'h' );
+      bsPutUChar ( s, (UChar)('0' + s->blockSize100k) );
+   }
+
+   if (s->nblock > 0) {
+
+      bsPutUChar ( s, 0x31 ); bsPutUChar ( s, 0x41 );
+      bsPutUChar ( s, 0x59 ); bsPutUChar ( s, 0x26 );
+      bsPutUChar ( s, 0x53 ); bsPutUChar ( s, 0x59 );
+
+      /*-- Now the block's CRC, so it is in a known place. --*/
+      bsPutUInt32 ( s, s->blockCRC );
+
+      /*-- 
+         Now a single bit indicating (non-)randomisation. 
+         As of version 0.9.5, we use a better sorting algorithm
+         which makes randomisation unnecessary.  So always set
+         the randomised bit to 'no'.  Of course, the decoder
+         still needs to be able to handle randomised blocks
+         so as to maintain backwards compatibility with
+         older versions of bzip2.
+      --*/
+      bsW(s,1,0);
+
+      bsW ( s, 24, s->origPtr );
+      generateMTFValues ( s );
+      sendMTFValues ( s );
+   }
+
+
+   /*-- If this is the last block, add the stream trailer. --*/
+   if (is_last_block) {
+
+      bsPutUChar ( s, 0x17 ); bsPutUChar ( s, 0x72 );
+      bsPutUChar ( s, 0x45 ); bsPutUChar ( s, 0x38 );
+      bsPutUChar ( s, 0x50 ); bsPutUChar ( s, 0x90 );
+      bsPutUInt32 ( s, s->combinedCRC );
+      if (s->verbosity >= 2)
+         VPrintf1( "    final combined CRC = 0x%x\n   ", s->combinedCRC );
+      bsFinishWrite ( s );
+   }
+}
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                        compress.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/winsup/bz2lib/configure b/winsup/bz2lib/configure
new file mode 100755
index 000000000..c45c7001c
--- /dev/null
+++ b/winsup/bz2lib/configure
@@ -0,0 +1,1896 @@
+#! /bin/sh
+
+# Guess values for system-dependent variables and create Makefiles.
+# Generated automatically using autoconf version 2.13 
+# Copyright (C) 1992, 93, 94, 95, 96 Free Software Foundation, Inc.
+#
+# This configure script is free software; the Free Software Foundation
+# gives unlimited permission to copy, distribute and modify it.
+
+# Defaults:
+ac_help=
+ac_default_prefix=/usr/local
+# Any additions from configure.in:
+ac_help="$ac_help
+  --enable-maintainer-mode enable make rules and dependencies not useful
+                          (and sometimes confusing) to the casual installer"
+
+# Initialize some variables set by options.
+# The variables have the same names as the options, with
+# dashes changed to underlines.
+build=NONE
+cache_file=./config.cache
+exec_prefix=NONE
+host=NONE
+no_create=
+nonopt=NONE
+no_recursion=
+prefix=NONE
+program_prefix=NONE
+program_suffix=NONE
+program_transform_name=s,x,x,
+silent=
+site=
+srcdir=
+target=NONE
+verbose=
+x_includes=NONE
+x_libraries=NONE
+bindir='${exec_prefix}/bin'
+sbindir='${exec_prefix}/sbin'
+libexecdir='${exec_prefix}/libexec'
+datadir='${prefix}/share'
+sysconfdir='${prefix}/etc'
+sharedstatedir='${prefix}/com'
+localstatedir='${prefix}/var'
+libdir='${exec_prefix}/lib'
+includedir='${prefix}/include'
+oldincludedir='/usr/include'
+infodir='${prefix}/info'
+mandir='${prefix}/man'
+
+# Initialize some other variables.
+subdirs=
+MFLAGS= MAKEFLAGS=
+SHELL=${CONFIG_SHELL-/bin/sh}
+# Maximum number of lines to put in a shell here document.
+ac_max_here_lines=12
+
+ac_prev=
+for ac_option
+do
+
+  # If the previous option needs an argument, assign it.
+  if test -n "$ac_prev"; then
+    eval "$ac_prev=\$ac_option"
+    ac_prev=
+    continue
+  fi
+
+  case "$ac_option" in
+  -*=*) ac_optarg=`echo "$ac_option" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
+  *) ac_optarg= ;;
+  esac
+
+  # Accept the important Cygnus configure options, so we can diagnose typos.
+
+  case "$ac_option" in
+
+  -bindir | --bindir | --bindi | --bind | --bin | --bi)
+    ac_prev=bindir ;;
+  -bindir=* | --bindir=* | --bindi=* | --bind=* | --bin=* | --bi=*)
+    bindir="$ac_optarg" ;;
+
+  -build | --build | --buil | --bui | --bu)
+    ac_prev=build ;;
+  -build=* | --build=* | --buil=* | --bui=* | --bu=*)
+    build="$ac_optarg" ;;
+
+  -cache-file | --cache-file | --cache-fil | --cache-fi \
+  | --cache-f | --cache- | --cache | --cach | --cac | --ca | --c)
+    ac_prev=cache_file ;;
+  -cache-file=* | --cache-file=* | --cache-fil=* | --cache-fi=* \
+  | --cache-f=* | --cache-=* | --cache=* | --cach=* | --cac=* | --ca=* | --c=*)
+    cache_file="$ac_optarg" ;;
+
+  -datadir | --datadir | --datadi | --datad | --data | --dat | --da)
+    ac_prev=datadir ;;
+  -datadir=* | --datadir=* | --datadi=* | --datad=* | --data=* | --dat=* \
+  | --da=*)
+    datadir="$ac_optarg" ;;
+
+  -disable-* | --disable-*)
+    ac_feature=`echo $ac_option|sed -e 's/-*disable-//'`
+    # Reject names that are not valid shell variable names.
+    if test -n "`echo $ac_feature| sed 's/[-a-zA-Z0-9_]//g'`"; then
+      { echo "configure: error: $ac_feature: invalid feature name" 1>&2; exit 1; }
+    fi
+    ac_feature=`echo $ac_feature| sed 's/-/_/g'`
+    eval "enable_${ac_feature}=no" ;;
+
+  -enable-* | --enable-*)
+    ac_feature=`echo $ac_option|sed -e 's/-*enable-//' -e 's/=.*//'`
+    # Reject names that are not valid shell variable names.
+    if test -n "`echo $ac_feature| sed 's/[-_a-zA-Z0-9]//g'`"; then
+      { echo "configure: error: $ac_feature: invalid feature name" 1>&2; exit 1; }
+    fi
+    ac_feature=`echo $ac_feature| sed 's/-/_/g'`
+    case "$ac_option" in
+      *=*) ;;
+      *) ac_optarg=yes ;;
+    esac
+    eval "enable_${ac_feature}='$ac_optarg'" ;;
+
+  -exec-prefix | --exec_prefix | --exec-prefix | --exec-prefi \
+  | --exec-pref | --exec-pre | --exec-pr | --exec-p | --exec- \
+  | --exec | --exe | --ex)
+    ac_prev=exec_prefix ;;
+  -exec-prefix=* | --exec_prefix=* | --exec-prefix=* | --exec-prefi=* \
+  | --exec-pref=* | --exec-pre=* | --exec-pr=* | --exec-p=* | --exec-=* \
+  | --exec=* | --exe=* | --ex=*)
+    exec_prefix="$ac_optarg" ;;
+
+  -gas | --gas | --ga | --g)
+    # Obsolete; use --with-gas.
+    with_gas=yes ;;
+
+  -help | --help | --hel | --he)
+    # Omit some internal or obsolete options to make the list less imposing.
+    # This message is too long to be a string in the A/UX 3.1 sh.
+    cat << EOF
+Usage: configure [options] [host]
+Options: [defaults in brackets after descriptions]
+Configuration:
+  --cache-file=FILE       cache test results in FILE
+  --help                  print this message
+  --no-create             do not create output files
+  --quiet, --silent       do not print \`checking...' messages
+  --version               print the version of autoconf that created configure
+Directory and file names:
+  --prefix=PREFIX         install architecture-independent files in PREFIX
+                          [$ac_default_prefix]
+  --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX
+                          [same as prefix]
+  --bindir=DIR            user executables in DIR [EPREFIX/bin]
+  --sbindir=DIR           system admin executables in DIR [EPREFIX/sbin]
+  --libexecdir=DIR        program executables in DIR [EPREFIX/libexec]
+  --datadir=DIR           read-only architecture-independent data in DIR
+                          [PREFIX/share]
+  --sysconfdir=DIR        read-only single-machine data in DIR [PREFIX/etc]
+  --sharedstatedir=DIR    modifiable architecture-independent data in DIR
+                          [PREFIX/com]
+  --localstatedir=DIR     modifiable single-machine data in DIR [PREFIX/var]
+  --libdir=DIR            object code libraries in DIR [EPREFIX/lib]
+  --includedir=DIR        C header files in DIR [PREFIX/include]
+  --oldincludedir=DIR     C header files for non-gcc in DIR [/usr/include]
+  --infodir=DIR           info documentation in DIR [PREFIX/info]
+  --mandir=DIR            man documentation in DIR [PREFIX/man]
+  --srcdir=DIR            find the sources in DIR [configure dir or ..]
+  --program-prefix=PREFIX prepend PREFIX to installed program names
+  --program-suffix=SUFFIX append SUFFIX to installed program names
+  --program-transform-name=PROGRAM
+                          run sed PROGRAM on installed program names
+EOF
+    cat << EOF
+Host type:
+  --build=BUILD           configure for building on BUILD [BUILD=HOST]
+  --host=HOST             configure for HOST [guessed]
+  --target=TARGET         configure for TARGET [TARGET=HOST]
+Features and packages:
+  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
+  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
+  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
+  --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
+  --x-includes=DIR        X include files are in DIR
+  --x-libraries=DIR       X library files are in DIR
+EOF
+    if test -n "$ac_help"; then
+      echo "--enable and --with options recognized:$ac_help"
+    fi
+    exit 0 ;;
+
+  -host | --host | --hos | --ho)
+    ac_prev=host ;;
+  -host=* | --host=* | --hos=* | --ho=*)
+    host="$ac_optarg" ;;
+
+  -includedir | --includedir | --includedi | --included | --include \
+  | --includ | --inclu | --incl | --inc)
+    ac_prev=includedir ;;
+  -includedir=* | --includedir=* | --includedi=* | --included=* | --include=* \
+  | --includ=* | --inclu=* | --incl=* | --inc=*)
+    includedir="$ac_optarg" ;;
+
+  -infodir | --infodir | --infodi | --infod | --info | --inf)
+    ac_prev=infodir ;;
+  -infodir=* | --infodir=* | --infodi=* | --infod=* | --info=* | --inf=*)
+    infodir="$ac_optarg" ;;
+
+  -libdir | --libdir | --libdi | --libd)
+    ac_prev=libdir ;;
+  -libdir=* | --libdir=* | --libdi=* | --libd=*)
+    libdir="$ac_optarg" ;;
+
+  -libexecdir | --libexecdir | --libexecdi | --libexecd | --libexec \
+  | --libexe | --libex | --libe)
+    ac_prev=libexecdir ;;
+  -libexecdir=* | --libexecdir=* | --libexecdi=* | --libexecd=* | --libexec=* \
+  | --libexe=* | --libex=* | --libe=*)
+    libexecdir="$ac_optarg" ;;
+
+  -localstatedir | --localstatedir | --localstatedi | --localstated \
+  | --localstate | --localstat | --localsta | --localst \
+  | --locals | --local | --loca | --loc | --lo)
+    ac_prev=localstatedir ;;
+  -localstatedir=* | --localstatedir=* | --localstatedi=* | --localstated=* \
+  | --localstate=* | --localstat=* | --localsta=* | --localst=* \
+  | --locals=* | --local=* | --loca=* | --loc=* | --lo=*)
+    localstatedir="$ac_optarg" ;;
+
+  -mandir | --mandir | --mandi | --mand | --man | --ma | --m)
+    ac_prev=mandir ;;
+  -mandir=* | --mandir=* | --mandi=* | --mand=* | --man=* | --ma=* | --m=*)
+    mandir="$ac_optarg" ;;
+
+  -nfp | --nfp | --nf)
+    # Obsolete; use --without-fp.
+    with_fp=no ;;
+
+  -no-create | --no-create | --no-creat | --no-crea | --no-cre \
+  | --no-cr | --no-c)
+    no_create=yes ;;
+
+  -no-recursion | --no-recursion | --no-recursio | --no-recursi \
+  | --no-recurs | --no-recur | --no-recu | --no-rec | --no-re | --no-r)
+    no_recursion=yes ;;
+
+  -oldincludedir | --oldincludedir | --oldincludedi | --oldincluded \
+  | --oldinclude | --oldinclud | --oldinclu | --oldincl | --oldinc \
+  | --oldin | --oldi | --old | --ol | --o)
+    ac_prev=oldincludedir ;;
+  -oldincludedir=* | --oldincludedir=* | --oldincludedi=* | --oldincluded=* \
+  | --oldinclude=* | --oldinclud=* | --oldinclu=* | --oldincl=* | --oldinc=* \
+  | --oldin=* | --oldi=* | --old=* | --ol=* | --o=*)
+    oldincludedir="$ac_optarg" ;;
+
+  -prefix | --prefix | --prefi | --pref | --pre | --pr | --p)
+    ac_prev=prefix ;;
+  -prefix=* | --prefix=* | --prefi=* | --pref=* | --pre=* | --pr=* | --p=*)
+    prefix="$ac_optarg" ;;
+
+  -program-prefix | --program-prefix | --program-prefi | --program-pref \
+  | --program-pre | --program-pr | --program-p)
+    ac_prev=program_prefix ;;
+  -program-prefix=* | --program-prefix=* | --program-prefi=* \
+  | --program-pref=* | --program-pre=* | --program-pr=* | --program-p=*)
+    program_prefix="$ac_optarg" ;;
+
+  -program-suffix | --program-suffix | --program-suffi | --program-suff \
+  | --program-suf | --program-su | --program-s)
+    ac_prev=program_suffix ;;
+  -program-suffix=* | --program-suffix=* | --program-suffi=* \
+  | --program-suff=* | --program-suf=* | --program-su=* | --program-s=*)
+    program_suffix="$ac_optarg" ;;
+
+  -program-transform-name | --program-transform-name \
+  | --program-transform-nam | --program-transform-na \
+  | --program-transform-n | --program-transform- \
+  | --program-transform | --program-transfor \
+  | --program-transfo | --program-transf \
+  | --program-trans | --program-tran \
+  | --progr-tra | --program-tr | --program-t)
+    ac_prev=program_transform_name ;;
+  -program-transform-name=* | --program-transform-name=* \
+  | --program-transform-nam=* | --program-transform-na=* \
+  | --program-transform-n=* | --program-transform-=* \
+  | --program-transform=* | --program-transfor=* \
+  | --program-transfo=* | --program-transf=* \
+  | --program-trans=* | --program-tran=* \
+  | --progr-tra=* | --program-tr=* | --program-t=*)
+    program_transform_name="$ac_optarg" ;;
+
+  -q | -quiet | --quiet | --quie | --qui | --qu | --q \
+  | -silent | --silent | --silen | --sile | --sil)
+    silent=yes ;;
+
+  -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
+    ac_prev=sbindir ;;
+  -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
+  | --sbi=* | --sb=*)
+    sbindir="$ac_optarg" ;;
+
+  -sharedstatedir | --sharedstatedir | --sharedstatedi \
+  | --sharedstated | --sharedstate | --sharedstat | --sharedsta \
+  | --sharedst | --shareds | --shared | --share | --shar \
+  | --sha | --sh)
+    ac_prev=sharedstatedir ;;
+  -sharedstatedir=* | --sharedstatedir=* | --sharedstatedi=* \
+  | --sharedstated=* | --sharedstate=* | --sharedstat=* | --sharedsta=* \
+  | --sharedst=* | --shareds=* | --shared=* | --share=* | --shar=* \
+  | --sha=* | --sh=*)
+    sharedstatedir="$ac_optarg" ;;
+
+  -site | --site | --sit)
+    ac_prev=site ;;
+  -site=* | --site=* | --sit=*)
+    site="$ac_optarg" ;;
+
+  -srcdir | --srcdir | --srcdi | --srcd | --src | --sr)
+    ac_prev=srcdir ;;
+  -srcdir=* | --srcdir=* | --srcdi=* | --srcd=* | --src=* | --sr=*)
+    srcdir="$ac_optarg" ;;
+
+  -sysconfdir | --sysconfdir | --sysconfdi | --sysconfd | --sysconf \
+  | --syscon | --sysco | --sysc | --sys | --sy)
+    ac_prev=sysconfdir ;;
+  -sysconfdir=* | --sysconfdir=* | --sysconfdi=* | --sysconfd=* | --sysconf=* \
+  | --syscon=* | --sysco=* | --sysc=* | --sys=* | --sy=*)
+    sysconfdir="$ac_optarg" ;;
+
+  -target | --target | --targe | --targ | --tar | --ta | --t)
+    ac_prev=target ;;
+  -target=* | --target=* | --targe=* | --targ=* | --tar=* | --ta=* | --t=*)
+    target="$ac_optarg" ;;
+
+  -v | -verbose | --verbose | --verbos | --verbo | --verb)
+    verbose=yes ;;
+
+  -version | --version | --versio | --versi | --vers)
+    echo "configure generated by autoconf version 2.13"
+    exit 0 ;;
+
+  -with-* | --with-*)
+    ac_package=`echo $ac_option|sed -e 's/-*with-//' -e 's/=.*//'`
+    # Reject names that are not valid shell variable names.
+    if test -n "`echo $ac_package| sed 's/[-_a-zA-Z0-9]//g'`"; then
+      { echo "configure: error: $ac_package: invalid package name" 1>&2; exit 1; }
+    fi
+    ac_package=`echo $ac_package| sed 's/-/_/g'`
+    case "$ac_option" in
+      *=*) ;;
+      *) ac_optarg=yes ;;
+    esac
+    eval "with_${ac_package}='$ac_optarg'" ;;
+
+  -without-* | --without-*)
+    ac_package=`echo $ac_option|sed -e 's/-*without-//'`
+    # Reject names that are not valid shell variable names.
+    if test -n "`echo $ac_package| sed 's/[-a-zA-Z0-9_]//g'`"; then
+      { echo "configure: error: $ac_package: invalid package name" 1>&2; exit 1; }
+    fi
+    ac_package=`echo $ac_package| sed 's/-/_/g'`
+    eval "with_${ac_package}=no" ;;
+
+  --x)
+    # Obsolete; use --with-x.
+    with_x=yes ;;
+
+  -x-includes | --x-includes | --x-include | --x-includ | --x-inclu \
+  | --x-incl | --x-inc | --x-in | --x-i)
+    ac_prev=x_includes ;;
+  -x-includes=* | --x-includes=* | --x-include=* | --x-includ=* | --x-inclu=* \
+  | --x-incl=* | --x-inc=* | --x-in=* | --x-i=*)
+    x_includes="$ac_optarg" ;;
+
+  -x-libraries | --x-libraries | --x-librarie | --x-librari \
+  | --x-librar | --x-libra | --x-libr | --x-lib | --x-li | --x-l)
+    ac_prev=x_libraries ;;
+  -x-libraries=* | --x-libraries=* | --x-librarie=* | --x-librari=* \
+  | --x-librar=* | --x-libra=* | --x-libr=* | --x-lib=* | --x-li=* | --x-l=*)
+    x_libraries="$ac_optarg" ;;
+
+  -*) { echo "configure: error: $ac_option: invalid option; use --help to show usage" 1>&2; exit 1; }
+    ;;
+
+  *)
+    if test -n "`echo $ac_option| sed 's/[-a-z0-9.]//g'`"; then
+      echo "configure: warning: $ac_option: invalid host type" 1>&2
+    fi
+    if test "x$nonopt" != xNONE; then
+      { echo "configure: error: can only configure for one host and one target at a time" 1>&2; exit 1; }
+    fi
+    nonopt="$ac_option"
+    ;;
+
+  esac
+done
+
+if test -n "$ac_prev"; then
+  { echo "configure: error: missing argument to --`echo $ac_prev | sed 's/_/-/g'`" 1>&2; exit 1; }
+fi
+
+trap 'rm -fr conftest* confdefs* core core.* *.core $ac_clean_files; exit 1' 1 2 15
+
+# File descriptor usage:
+# 0 standard input
+# 1 file creation
+# 2 errors and warnings
+# 3 some systems may open it to /dev/tty
+# 4 used on the Kubota Titan
+# 6 checking for... messages and results
+# 5 compiler messages saved in config.log
+if test "$silent" = yes; then
+  exec 6>/dev/null
+else
+  exec 6>&1
+fi
+exec 5>./config.log
+
+echo "\
+This file contains any messages produced by compilers while
+running configure, to aid debugging if configure makes a mistake.
+" 1>&5
+
+# Strip out --no-create and --no-recursion so they do not pile up.
+# Also quote any args containing shell metacharacters.
+ac_configure_args=
+for ac_arg
+do
+  case "$ac_arg" in
+  -no-create | --no-create | --no-creat | --no-crea | --no-cre \
+  | --no-cr | --no-c) ;;
+  -no-recursion | --no-recursion | --no-recursio | --no-recursi \
+  | --no-recurs | --no-recur | --no-recu | --no-rec | --no-re | --no-r) ;;
+  *" "*|*"	"*|*[\[\]\~\#\$\^\&\*\(\)\{\}\\\|\;\<\>\?]*)
+  ac_configure_args="$ac_configure_args '$ac_arg'" ;;
+  *) ac_configure_args="$ac_configure_args $ac_arg" ;;
+  esac
+done
+
+# NLS nuisances.
+# Only set these to C if already set.  These must not be set unconditionally
+# because not all systems understand e.g. LANG=C (notably SCO).
+# Fixing LC_MESSAGES prevents Solaris sh from translating var values in `set'!
+# Non-C LC_CTYPE values break the ctype check.
+if test "${LANG+set}"   = set; then LANG=C;   export LANG;   fi
+if test "${LC_ALL+set}" = set; then LC_ALL=C; export LC_ALL; fi
+if test "${LC_MESSAGES+set}" = set; then LC_MESSAGES=C; export LC_MESSAGES; fi
+if test "${LC_CTYPE+set}"    = set; then LC_CTYPE=C;    export LC_CTYPE;    fi
+
+# confdefs.h avoids OS command line length limits that DEFS can exceed.
+rm -rf conftest* confdefs.h
+# AIX cpp loses on an empty file, so make sure it contains at least a newline.
+echo > confdefs.h
+
+# A filename unique to this package, relative to the directory that
+# configure is in, which we can look for to find out if srcdir is correct.
+ac_unique_file=bzlib.h
+
+# Find the source files, if location was not specified.
+if test -z "$srcdir"; then
+  ac_srcdir_defaulted=yes
+  # Try the directory containing this script, then its parent.
+  ac_prog=$0
+  ac_confdir=`echo $ac_prog|sed 's%/[^/][^/]*$%%'`
+  test "x$ac_confdir" = "x$ac_prog" && ac_confdir=.
+  srcdir=$ac_confdir
+  if test ! -r $srcdir/$ac_unique_file; then
+    srcdir=..
+  fi
+else
+  ac_srcdir_defaulted=no
+fi
+if test ! -r $srcdir/$ac_unique_file; then
+  if test "$ac_srcdir_defaulted" = yes; then
+    { echo "configure: error: can not find sources in $ac_confdir or .." 1>&2; exit 1; }
+  else
+    { echo "configure: error: can not find sources in $srcdir" 1>&2; exit 1; }
+  fi
+fi
+srcdir=`echo "${srcdir}" | sed 's%\([^/]\)/*$%\1%'`
+
+# Prefer explicitly selected file to automatically selected ones.
+if test -z "$CONFIG_SITE"; then
+  if test "x$prefix" != xNONE; then
+    CONFIG_SITE="$prefix/share/config.site $prefix/etc/config.site"
+  else
+    CONFIG_SITE="$ac_default_prefix/share/config.site $ac_default_prefix/etc/config.site"
+  fi
+fi
+for ac_site_file in $CONFIG_SITE; do
+  if test -r "$ac_site_file"; then
+    echo "loading site script $ac_site_file"
+    . "$ac_site_file"
+  fi
+done
+
+if test -r "$cache_file"; then
+  echo "loading cache $cache_file"
+  . $cache_file
+else
+  echo "creating cache $cache_file"
+  > $cache_file
+fi
+
+ac_ext=c
+# CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='${CC-cc} -c $CFLAGS $CPPFLAGS conftest.$ac_ext 1>&5'
+ac_link='${CC-cc} -o conftest${ac_exeext} $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&5'
+cross_compiling=$ac_cv_prog_cc_cross
+
+ac_exeext=
+ac_objext=o
+if (echo "testing\c"; echo 1,2,3) | grep c >/dev/null; then
+  # Stardent Vistra SVR4 grep lacks -e, says ghazi@caip.rutgers.edu.
+  if (echo -n testing; echo 1,2,3) | sed s/-n/xn/ | grep xn >/dev/null; then
+    ac_n= ac_c='
+' ac_t='	'
+  else
+    ac_n=-n ac_c= ac_t=
+  fi
+else
+  ac_n= ac_c='\c' ac_t=
+fi
+
+
+ac_aux_dir=
+for ac_dir in `cd $srcdir/../..;pwd` $srcdir/`cd $srcdir/../..;pwd`; do
+  if test -f $ac_dir/install-sh; then
+    ac_aux_dir=$ac_dir
+    ac_install_sh="$ac_aux_dir/install-sh -c"
+    break
+  elif test -f $ac_dir/install.sh; then
+    ac_aux_dir=$ac_dir
+    ac_install_sh="$ac_aux_dir/install.sh -c"
+    break
+  fi
+done
+if test -z "$ac_aux_dir"; then
+  { echo "configure: error: can not find install-sh or install.sh in `cd $srcdir/../..;pwd` $srcdir/`cd $srcdir/../..;pwd`" 1>&2; exit 1; }
+fi
+ac_config_guess=$ac_aux_dir/config.guess
+ac_config_sub=$ac_aux_dir/config.sub
+ac_configure=$ac_aux_dir/configure # This should be Cygnus configure.
+
+# Find a good install program.  We prefer a C program (faster),
+# so one script is as good as another.  But avoid the broken or
+# incompatible versions:
+# SysV /etc/install, /usr/sbin/install
+# SunOS /usr/etc/install
+# IRIX /sbin/install
+# AIX /bin/install
+# AIX 4 /usr/bin/installbsd, which doesn't work without a -g flag
+# AFS /usr/afsws/bin/install, which mishandles nonexistent args
+# SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
+# ./install, which can be erroneously created by make from ./install.sh.
+echo $ac_n "checking for a BSD compatible install""... $ac_c" 1>&6
+echo "configure:559: checking for a BSD compatible install" >&5
+if test -z "$INSTALL"; then
+if eval "test \"`echo '$''{'ac_cv_path_install'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+    IFS="${IFS= 	}"; ac_save_IFS="$IFS"; IFS=":"
+  for ac_dir in $PATH; do
+    # Account for people who put trailing slashes in PATH elements.
+    case "$ac_dir/" in
+    /|./|.//|/etc/*|/usr/sbin/*|/usr/etc/*|/sbin/*|/usr/afsws/bin/*|/usr/ucb/*) ;;
+    *)
+      # OSF1 and SCO ODT 3.0 have their own names for install.
+      # Don't use installbsd from OSF since it installs stuff as root
+      # by default.
+      for ac_prog in ginstall scoinst install; do
+        if test -f $ac_dir/$ac_prog; then
+	  if test $ac_prog = install &&
+            grep dspmsg $ac_dir/$ac_prog >/dev/null 2>&1; then
+	    # AIX install.  It has an incompatible calling convention.
+	    :
+	  else
+	    ac_cv_path_install="$ac_dir/$ac_prog -c"
+	    break 2
+	  fi
+	fi
+      done
+      ;;
+    esac
+  done
+  IFS="$ac_save_IFS"
+
+fi
+  if test "${ac_cv_path_install+set}" = set; then
+    INSTALL="$ac_cv_path_install"
+  else
+    # As a last resort, use the slow shell script.  We don't cache a
+    # path for INSTALL within a source directory, because that will
+    # break other packages using the cache if that directory is
+    # removed, or if the path is relative.
+    INSTALL="$ac_install_sh"
+  fi
+fi
+echo "$ac_t""$INSTALL" 1>&6
+
+# Use test -z because SunOS4 sh mishandles braces in ${var-val}.
+# It thinks the first close brace ends the variable substitution.
+test -z "$INSTALL_PROGRAM" && INSTALL_PROGRAM='${INSTALL}'
+
+test -z "$INSTALL_SCRIPT" && INSTALL_SCRIPT='${INSTALL_PROGRAM}'
+
+test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'
+
+echo $ac_n "checking whether build environment is sane""... $ac_c" 1>&6
+echo "configure:612: checking whether build environment is sane" >&5
+# Just in case
+sleep 1
+echo timestamp > conftestfile
+# Do `set' in a subshell so we don't clobber the current shell's
+# arguments.  Must try -L first in case configure is actually a
+# symlink; some systems play weird games with the mod time of symlinks
+# (eg FreeBSD returns the mod time of the symlink's containing
+# directory).
+if (
+   set X `ls -Lt $srcdir/configure conftestfile 2> /dev/null`
+   if test "$*" = "X"; then
+      # -L didn't work.
+      set X `ls -t $srcdir/configure conftestfile`
+   fi
+   if test "$*" != "X $srcdir/configure conftestfile" \
+      && test "$*" != "X conftestfile $srcdir/configure"; then
+
+      # If neither matched, then we have a broken ls.  This can happen
+      # if, for instance, CONFIG_SHELL is bash and it inherits a
+      # broken ls alias from the environment.  This has actually
+      # happened.  Such a system could not be considered "sane".
+      { echo "configure: error: ls -t appears to fail.  Make sure there is not a broken
+alias in your environment" 1>&2; exit 1; }
+   fi
+
+   test "$2" = conftestfile
+   )
+then
+   # Ok.
+   :
+else
+   { echo "configure: error: newly created file is older than distributed files!
+Check your system clock" 1>&2; exit 1; }
+fi
+rm -f conftest*
+echo "$ac_t""yes" 1>&6
+if test "$program_transform_name" = s,x,x,; then
+  program_transform_name=
+else
+  # Double any \ or $.  echo might interpret backslashes.
+  cat <<\EOF_SED > conftestsed
+s,\\,\\\\,g; s,\$,$$,g
+EOF_SED
+  program_transform_name="`echo $program_transform_name|sed -f conftestsed`"
+  rm -f conftestsed
+fi
+test "$program_prefix" != NONE &&
+  program_transform_name="s,^,${program_prefix},; $program_transform_name"
+# Use a double $ so make ignores it.
+test "$program_suffix" != NONE &&
+  program_transform_name="s,\$\$,${program_suffix},; $program_transform_name"
+
+# sed with no file args requires a program.
+test "$program_transform_name" = "" && program_transform_name="s,x,x,"
+
+echo $ac_n "checking whether ${MAKE-make} sets \${MAKE}""... $ac_c" 1>&6
+echo "configure:669: checking whether ${MAKE-make} sets \${MAKE}" >&5
+set dummy ${MAKE-make}; ac_make=`echo "$2" | sed 'y%./+-%__p_%'`
+if eval "test \"`echo '$''{'ac_cv_prog_make_${ac_make}_set'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftestmake <<\EOF
+all:
+	@echo 'ac_maketemp="${MAKE}"'
+EOF
+# GNU make sometimes prints "make[1]: Entering...", which would confuse us.
+eval `${MAKE-make} -f conftestmake 2>/dev/null | grep temp=`
+if test -n "$ac_maketemp"; then
+  eval ac_cv_prog_make_${ac_make}_set=yes
+else
+  eval ac_cv_prog_make_${ac_make}_set=no
+fi
+rm -f conftestmake
+fi
+if eval "test \"`echo '$ac_cv_prog_make_'${ac_make}_set`\" = yes"; then
+  echo "$ac_t""yes" 1>&6
+  SET_MAKE=
+else
+  echo "$ac_t""no" 1>&6
+  SET_MAKE="MAKE=${MAKE-make}"
+fi
+
+
+PACKAGE=libbz2
+
+VERSION=0.0
+
+if test "`cd $srcdir && pwd`" != "`pwd`" && test -f $srcdir/config.status; then
+  { echo "configure: error: source directory already configured; run "make distclean" there first" 1>&2; exit 1; }
+fi
+cat >> confdefs.h <<EOF
+#define PACKAGE "$PACKAGE"
+EOF
+
+cat >> confdefs.h <<EOF
+#define VERSION "$VERSION"
+EOF
+
+
+
+missing_dir=`cd $ac_aux_dir && pwd`
+echo $ac_n "checking for working aclocal""... $ac_c" 1>&6
+echo "configure:715: checking for working aclocal" >&5
+# Run test in a subshell; some versions of sh will print an error if
+# an executable is not found, even if stderr is redirected.
+# Redirect stdin to placate older versions of autoconf.  Sigh.
+if (aclocal --version) < /dev/null > /dev/null 2>&1; then
+   ACLOCAL=aclocal
+   echo "$ac_t""found" 1>&6
+else
+   ACLOCAL="$missing_dir/missing aclocal"
+   echo "$ac_t""missing" 1>&6
+fi
+
+echo $ac_n "checking for working autoconf""... $ac_c" 1>&6
+echo "configure:728: checking for working autoconf" >&5
+# Run test in a subshell; some versions of sh will print an error if
+# an executable is not found, even if stderr is redirected.
+# Redirect stdin to placate older versions of autoconf.  Sigh.
+if (autoconf --version) < /dev/null > /dev/null 2>&1; then
+   AUTOCONF=autoconf
+   echo "$ac_t""found" 1>&6
+else
+   AUTOCONF="$missing_dir/missing autoconf"
+   echo "$ac_t""missing" 1>&6
+fi
+
+echo $ac_n "checking for working automake""... $ac_c" 1>&6
+echo "configure:741: checking for working automake" >&5
+# Run test in a subshell; some versions of sh will print an error if
+# an executable is not found, even if stderr is redirected.
+# Redirect stdin to placate older versions of autoconf.  Sigh.
+if (automake --version) < /dev/null > /dev/null 2>&1; then
+   AUTOMAKE=automake
+   echo "$ac_t""found" 1>&6
+else
+   AUTOMAKE="$missing_dir/missing automake"
+   echo "$ac_t""missing" 1>&6
+fi
+
+echo $ac_n "checking for working autoheader""... $ac_c" 1>&6
+echo "configure:754: checking for working autoheader" >&5
+# Run test in a subshell; some versions of sh will print an error if
+# an executable is not found, even if stderr is redirected.
+# Redirect stdin to placate older versions of autoconf.  Sigh.
+if (autoheader --version) < /dev/null > /dev/null 2>&1; then
+   AUTOHEADER=autoheader
+   echo "$ac_t""found" 1>&6
+else
+   AUTOHEADER="$missing_dir/missing autoheader"
+   echo "$ac_t""missing" 1>&6
+fi
+
+echo $ac_n "checking for working makeinfo""... $ac_c" 1>&6
+echo "configure:767: checking for working makeinfo" >&5
+# Run test in a subshell; some versions of sh will print an error if
+# an executable is not found, even if stderr is redirected.
+# Redirect stdin to placate older versions of autoconf.  Sigh.
+if (makeinfo --version) < /dev/null > /dev/null 2>&1; then
+   MAKEINFO=makeinfo
+   echo "$ac_t""found" 1>&6
+else
+   MAKEINFO="$missing_dir/missing makeinfo"
+   echo "$ac_t""missing" 1>&6
+fi
+
+
+echo $ac_n "checking whether to enable maintainer-specific portions of Makefiles""... $ac_c" 1>&6
+echo "configure:781: checking whether to enable maintainer-specific portions of Makefiles" >&5
+    # Check whether --enable-maintainer-mode or --disable-maintainer-mode was given.
+if test "${enable_maintainer_mode+set}" = set; then
+  enableval="$enable_maintainer_mode"
+  USE_MAINTAINER_MODE=$enableval
+else
+  USE_MAINTAINER_MODE=no
+fi
+
+  echo "$ac_t""$USE_MAINTAINER_MODE" 1>&6
+  
+
+if test $USE_MAINTAINER_MODE = yes; then
+  MAINTAINER_MODE_TRUE=
+  MAINTAINER_MODE_FALSE='#'
+else
+  MAINTAINER_MODE_TRUE='#'
+  MAINTAINER_MODE_FALSE=
+fi
+  MAINT=$MAINTAINER_MODE_TRUE
+  
+
+
+# FIXME: We temporarily define our own version of AC_PROG_CC.  This is
+# copied from autoconf 2.12, but does not call AC_PROG_CC_WORKS.  We
+# are probably using a cross compiler, which will not be able to fully
+# link an executable.  This should really be fixed in autoconf
+# itself.
+
+
+
+CPPFLAGS=-U_WIN32
+
+# Make sure we can run config.sub.
+if ${CONFIG_SHELL-/bin/sh} $ac_config_sub sun4 >/dev/null 2>&1; then :
+else { echo "configure: error: can not run $ac_config_sub" 1>&2; exit 1; }
+fi
+
+echo $ac_n "checking host system type""... $ac_c" 1>&6
+echo "configure:820: checking host system type" >&5
+
+host_alias=$host
+case "$host_alias" in
+NONE)
+  case $nonopt in
+  NONE)
+    if host_alias=`${CONFIG_SHELL-/bin/sh} $ac_config_guess`; then :
+    else { echo "configure: error: can not guess host type; you must specify one" 1>&2; exit 1; }
+    fi ;;
+  *) host_alias=$nonopt ;;
+  esac ;;
+esac
+
+host=`${CONFIG_SHELL-/bin/sh} $ac_config_sub $host_alias`
+host_cpu=`echo $host | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\1/'`
+host_vendor=`echo $host | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\2/'`
+host_os=`echo $host | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\3/'`
+echo "$ac_t""$host" 1>&6
+
+echo $ac_n "checking build system type""... $ac_c" 1>&6
+echo "configure:841: checking build system type" >&5
+
+build_alias=$build
+case "$build_alias" in
+NONE)
+  case $nonopt in
+  NONE) build_alias=$host_alias ;;
+  *) build_alias=$nonopt ;;
+  esac ;;
+esac
+
+build=`${CONFIG_SHELL-/bin/sh} $ac_config_sub $build_alias`
+build_cpu=`echo $build | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\1/'`
+build_vendor=`echo $build | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\2/'`
+build_os=`echo $build | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\3/'`
+echo "$ac_t""$build" 1>&6
+
+if test $host != $build; then
+  ac_tool_prefix=${host_alias}-
+else
+  ac_tool_prefix=
+fi
+
+# Extract the first word of "${ac_tool_prefix}ar", so it can be a program name with args.
+set dummy ${ac_tool_prefix}ar; ac_word=$2
+echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
+echo "configure:867: checking for $ac_word" >&5
+if eval "test \"`echo '$''{'ac_cv_prog_AR'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test -n "$AR"; then
+  ac_cv_prog_AR="$AR" # Let the user override the test.
+else
+  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS=":"
+  ac_dummy="$PATH"
+  for ac_dir in $ac_dummy; do
+    test -z "$ac_dir" && ac_dir=.
+    if test -f $ac_dir/$ac_word; then
+      ac_cv_prog_AR="${ac_tool_prefix}ar"
+      break
+    fi
+  done
+  IFS="$ac_save_ifs"
+fi
+fi
+AR="$ac_cv_prog_AR"
+if test -n "$AR"; then
+  echo "$ac_t""$AR" 1>&6
+else
+  echo "$ac_t""no" 1>&6
+fi
+
+
+if test -z "$ac_cv_prog_AR"; then
+if test -n "$ac_tool_prefix"; then
+  # Extract the first word of "ar", so it can be a program name with args.
+set dummy ar; ac_word=$2
+echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
+echo "configure:899: checking for $ac_word" >&5
+if eval "test \"`echo '$''{'ac_cv_prog_AR'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test -n "$AR"; then
+  ac_cv_prog_AR="$AR" # Let the user override the test.
+else
+  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS=":"
+  ac_dummy="$PATH"
+  for ac_dir in $ac_dummy; do
+    test -z "$ac_dir" && ac_dir=.
+    if test -f $ac_dir/$ac_word; then
+      ac_cv_prog_AR="ar"
+      break
+    fi
+  done
+  IFS="$ac_save_ifs"
+  test -z "$ac_cv_prog_AR" && ac_cv_prog_AR="ar"
+fi
+fi
+AR="$ac_cv_prog_AR"
+if test -n "$AR"; then
+  echo "$ac_t""$AR" 1>&6
+else
+  echo "$ac_t""no" 1>&6
+fi
+
+else
+  AR="ar"
+fi
+fi
+
+# Extract the first word of "${ac_tool_prefix}nm", so it can be a program name with args.
+set dummy ${ac_tool_prefix}nm; ac_word=$2
+echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
+echo "configure:934: checking for $ac_word" >&5
+if eval "test \"`echo '$''{'ac_cv_prog_NM'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test -n "$NM"; then
+  ac_cv_prog_NM="$NM" # Let the user override the test.
+else
+  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS=":"
+  ac_dummy="$PATH"
+  for ac_dir in $ac_dummy; do
+    test -z "$ac_dir" && ac_dir=.
+    if test -f $ac_dir/$ac_word; then
+      ac_cv_prog_NM="${ac_tool_prefix}nm"
+      break
+    fi
+  done
+  IFS="$ac_save_ifs"
+fi
+fi
+NM="$ac_cv_prog_NM"
+if test -n "$NM"; then
+  echo "$ac_t""$NM" 1>&6
+else
+  echo "$ac_t""no" 1>&6
+fi
+
+
+if test -z "$ac_cv_prog_NM"; then
+if test -n "$ac_tool_prefix"; then
+  # Extract the first word of "nm", so it can be a program name with args.
+set dummy nm; ac_word=$2
+echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
+echo "configure:966: checking for $ac_word" >&5
+if eval "test \"`echo '$''{'ac_cv_prog_NM'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test -n "$NM"; then
+  ac_cv_prog_NM="$NM" # Let the user override the test.
+else
+  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS=":"
+  ac_dummy="$PATH"
+  for ac_dir in $ac_dummy; do
+    test -z "$ac_dir" && ac_dir=.
+    if test -f $ac_dir/$ac_word; then
+      ac_cv_prog_NM="nm"
+      break
+    fi
+  done
+  IFS="$ac_save_ifs"
+  test -z "$ac_cv_prog_NM" && ac_cv_prog_NM="nm"
+fi
+fi
+NM="$ac_cv_prog_NM"
+if test -n "$NM"; then
+  echo "$ac_t""$NM" 1>&6
+else
+  echo "$ac_t""no" 1>&6
+fi
+
+else
+  NM="nm"
+fi
+fi
+
+# Extract the first word of "${ac_tool_prefix}ranlib", so it can be a program name with args.
+set dummy ${ac_tool_prefix}ranlib; ac_word=$2
+echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
+echo "configure:1001: checking for $ac_word" >&5
+if eval "test \"`echo '$''{'ac_cv_prog_RANLIB'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test -n "$RANLIB"; then
+  ac_cv_prog_RANLIB="$RANLIB" # Let the user override the test.
+else
+  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS=":"
+  ac_dummy="$PATH"
+  for ac_dir in $ac_dummy; do
+    test -z "$ac_dir" && ac_dir=.
+    if test -f $ac_dir/$ac_word; then
+      ac_cv_prog_RANLIB="${ac_tool_prefix}ranlib"
+      break
+    fi
+  done
+  IFS="$ac_save_ifs"
+fi
+fi
+RANLIB="$ac_cv_prog_RANLIB"
+if test -n "$RANLIB"; then
+  echo "$ac_t""$RANLIB" 1>&6
+else
+  echo "$ac_t""no" 1>&6
+fi
+
+
+if test -z "$ac_cv_prog_RANLIB"; then
+if test -n "$ac_tool_prefix"; then
+  # Extract the first word of "ranlib", so it can be a program name with args.
+set dummy ranlib; ac_word=$2
+echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
+echo "configure:1033: checking for $ac_word" >&5
+if eval "test \"`echo '$''{'ac_cv_prog_RANLIB'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test -n "$RANLIB"; then
+  ac_cv_prog_RANLIB="$RANLIB" # Let the user override the test.
+else
+  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS=":"
+  ac_dummy="$PATH"
+  for ac_dir in $ac_dummy; do
+    test -z "$ac_dir" && ac_dir=.
+    if test -f $ac_dir/$ac_word; then
+      ac_cv_prog_RANLIB="ranlib"
+      break
+    fi
+  done
+  IFS="$ac_save_ifs"
+  test -z "$ac_cv_prog_RANLIB" && ac_cv_prog_RANLIB="ranlib"
+fi
+fi
+RANLIB="$ac_cv_prog_RANLIB"
+if test -n "$RANLIB"; then
+  echo "$ac_t""$RANLIB" 1>&6
+else
+  echo "$ac_t""no" 1>&6
+fi
+
+else
+  RANLIB="ranlib"
+fi
+fi
+
+# Extract the first word of "${ac_tool_prefix}gcc", so it can be a program name with args.
+set dummy ${ac_tool_prefix}gcc; ac_word=$2
+echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
+echo "configure:1068: checking for $ac_word" >&5
+if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS=":"
+  ac_dummy="$PATH"
+  for ac_dir in $ac_dummy; do
+    test -z "$ac_dir" && ac_dir=.
+    if test -f $ac_dir/$ac_word; then
+      ac_cv_prog_CC="${ac_tool_prefix}gcc"
+      break
+    fi
+  done
+  IFS="$ac_save_ifs"
+fi
+fi
+CC="$ac_cv_prog_CC"
+if test -n "$CC"; then
+  echo "$ac_t""$CC" 1>&6
+else
+  echo "$ac_t""no" 1>&6
+fi
+
+
+if test -z "$ac_cv_prog_CC"; then
+if test -n "$ac_tool_prefix"; then
+  # Extract the first word of "gcc", so it can be a program name with args.
+set dummy gcc; ac_word=$2
+echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
+echo "configure:1100: checking for $ac_word" >&5
+if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS=":"
+  ac_dummy="$PATH"
+  for ac_dir in $ac_dummy; do
+    test -z "$ac_dir" && ac_dir=.
+    if test -f $ac_dir/$ac_word; then
+      ac_cv_prog_CC="gcc"
+      break
+    fi
+  done
+  IFS="$ac_save_ifs"
+  test -z "$ac_cv_prog_CC" && ac_cv_prog_CC="gcc"
+fi
+fi
+CC="$ac_cv_prog_CC"
+if test -n "$CC"; then
+  echo "$ac_t""$CC" 1>&6
+else
+  echo "$ac_t""no" 1>&6
+fi
+
+else
+  CC="gcc"
+fi
+fi
+
+if test -z "$CC"; then
+  # Extract the first word of "cc", so it can be a program name with args.
+set dummy cc; ac_word=$2
+echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
+echo "configure:1136: checking for $ac_word" >&5
+if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS=":"
+  ac_prog_rejected=no
+  ac_dummy="$PATH"
+  for ac_dir in $ac_dummy; do
+    test -z "$ac_dir" && ac_dir=.
+    if test -f $ac_dir/$ac_word; then
+      if test "$ac_dir/$ac_word" = "/usr/ucb/cc"; then
+        ac_prog_rejected=yes
+	continue
+      fi
+      ac_cv_prog_CC="cc"
+      break
+    fi
+  done
+  IFS="$ac_save_ifs"
+if test $ac_prog_rejected = yes; then
+  # We found a bogon in the path, so make sure we never use it.
+  set dummy $ac_cv_prog_CC
+  shift
+  if test $# -gt 0; then
+    # We chose a different compiler from the bogus one.
+    # However, it has the same basename, so the bogon will be chosen
+    # first if we set CC to just the basename; use the full file name.
+    shift
+    set dummy "$ac_dir/$ac_word" "$@"
+    shift
+    ac_cv_prog_CC="$@"
+  fi
+fi
+fi
+fi
+CC="$ac_cv_prog_CC"
+if test -n "$CC"; then
+  echo "$ac_t""$CC" 1>&6
+else
+  echo "$ac_t""no" 1>&6
+fi
+
+  test -z "$CC" && { echo "configure: error: no acceptable cc found in \$PATH" 1>&2; exit 1; }
+fi
+
+echo $ac_n "checking whether we are using GNU C""... $ac_c" 1>&6
+echo "configure:1185: checking whether we are using GNU C" >&5
+if eval "test \"`echo '$''{'ac_cv_prog_gcc'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.c <<EOF
+#ifdef __GNUC__
+  yes;
+#endif
+EOF
+if { ac_try='${CC-cc} -E conftest.c'; { (eval echo configure:1194: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } | egrep yes >/dev/null 2>&1; then
+  ac_cv_prog_gcc=yes
+else
+  ac_cv_prog_gcc=no
+fi
+fi
+
+echo "$ac_t""$ac_cv_prog_gcc" 1>&6
+
+if test $ac_cv_prog_gcc = yes; then
+  GCC=yes
+  ac_test_CFLAGS="${CFLAGS+set}"
+  ac_save_CFLAGS="$CFLAGS"
+  CFLAGS=
+  echo $ac_n "checking whether ${CC-cc} accepts -g""... $ac_c" 1>&6
+echo "configure:1209: checking whether ${CC-cc} accepts -g" >&5
+if eval "test \"`echo '$''{'ac_cv_prog_cc_g'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  echo 'void f(){}' > conftest.c
+if test -z "`${CC-cc} -g -c conftest.c 2>&1`"; then
+  ac_cv_prog_cc_g=yes
+else
+  ac_cv_prog_cc_g=no
+fi
+rm -f conftest*
+
+fi
+
+echo "$ac_t""$ac_cv_prog_cc_g" 1>&6
+  if test "$ac_test_CFLAGS" = set; then
+    CFLAGS="$ac_save_CFLAGS"
+  elif test $ac_cv_prog_cc_g = yes; then
+    CFLAGS="-gstabs+ -O2"
+  else
+    CFLAGS="-O2"
+  fi
+  if test "$ac_test_CXXFLAGS" != set; then
+    CXXFLAGS='$(CFLAGS)'
+  fi
+else
+  GCC=
+  test "${CFLAGS+set}" = set || CFLAGS="-g"
+fi
+
+# Find a good install program.  We prefer a C program (faster),
+# so one script is as good as another.  But avoid the broken or
+# incompatible versions:
+# SysV /etc/install, /usr/sbin/install
+# SunOS /usr/etc/install
+# IRIX /sbin/install
+# AIX /bin/install
+# AIX 4 /usr/bin/installbsd, which doesn't work without a -g flag
+# AFS /usr/afsws/bin/install, which mishandles nonexistent args
+# SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
+# ./install, which can be erroneously created by make from ./install.sh.
+echo $ac_n "checking for a BSD compatible install""... $ac_c" 1>&6
+echo "configure:1251: checking for a BSD compatible install" >&5
+if test -z "$INSTALL"; then
+if eval "test \"`echo '$''{'ac_cv_path_install'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+    IFS="${IFS= 	}"; ac_save_IFS="$IFS"; IFS=":"
+  for ac_dir in $PATH; do
+    # Account for people who put trailing slashes in PATH elements.
+    case "$ac_dir/" in
+    /|./|.//|/etc/*|/usr/sbin/*|/usr/etc/*|/sbin/*|/usr/afsws/bin/*|/usr/ucb/*) ;;
+    *)
+      # OSF1 and SCO ODT 3.0 have their own names for install.
+      # Don't use installbsd from OSF since it installs stuff as root
+      # by default.
+      for ac_prog in ginstall scoinst install; do
+        if test -f $ac_dir/$ac_prog; then
+	  if test $ac_prog = install &&
+            grep dspmsg $ac_dir/$ac_prog >/dev/null 2>&1; then
+	    # AIX install.  It has an incompatible calling convention.
+	    :
+	  else
+	    ac_cv_path_install="$ac_dir/$ac_prog -c"
+	    break 2
+	  fi
+	fi
+      done
+      ;;
+    esac
+  done
+  IFS="$ac_save_IFS"
+
+fi
+  if test "${ac_cv_path_install+set}" = set; then
+    INSTALL="$ac_cv_path_install"
+  else
+    # As a last resort, use the slow shell script.  We don't cache a
+    # path for INSTALL within a source directory, because that will
+    # break other packages using the cache if that directory is
+    # removed, or if the path is relative.
+    INSTALL="$ac_install_sh"
+  fi
+fi
+echo "$ac_t""$INSTALL" 1>&6
+
+# Use test -z because SunOS4 sh mishandles braces in ${var-val}.
+# It thinks the first close brace ends the variable substitution.
+test -z "$INSTALL_PROGRAM" && INSTALL_PROGRAM='${INSTALL}'
+
+test -z "$INSTALL_SCRIPT" && INSTALL_SCRIPT='${INSTALL_PROGRAM}'
+
+test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'
+
+echo $ac_n "checking how to run the C preprocessor""... $ac_c" 1>&6
+echo "configure:1304: checking how to run the C preprocessor" >&5
+# On Suns, sometimes $CPP names a directory.
+if test -n "$CPP" && test -d "$CPP"; then
+  CPP=
+fi
+if test -z "$CPP"; then
+if eval "test \"`echo '$''{'ac_cv_prog_CPP'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+    # This must be in double quotes, not single quotes, because CPP may get
+  # substituted into the Makefile and "${CC-cc}" will confuse make.
+  CPP="${CC-cc} -E"
+  # On the NeXT, cc -E runs the code through the compiler's parser,
+  # not just through cpp.
+  cat > conftest.$ac_ext <<EOF
+#line 1319 "configure"
+#include "confdefs.h"
+#include <assert.h>
+Syntax Error
+EOF
+ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
+{ (eval echo configure:1325: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
+if test -z "$ac_err"; then
+  :
+else
+  echo "$ac_err" >&5
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  CPP="${CC-cc} -E -traditional-cpp"
+  cat > conftest.$ac_ext <<EOF
+#line 1336 "configure"
+#include "confdefs.h"
+#include <assert.h>
+Syntax Error
+EOF
+ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
+{ (eval echo configure:1342: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
+if test -z "$ac_err"; then
+  :
+else
+  echo "$ac_err" >&5
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  CPP="${CC-cc} -nologo -E"
+  cat > conftest.$ac_ext <<EOF
+#line 1353 "configure"
+#include "confdefs.h"
+#include <assert.h>
+Syntax Error
+EOF
+ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
+{ (eval echo configure:1359: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
+if test -z "$ac_err"; then
+  :
+else
+  echo "$ac_err" >&5
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  CPP=/lib/cpp
+fi
+rm -f conftest*
+fi
+rm -f conftest*
+fi
+rm -f conftest*
+  ac_cv_prog_CPP="$CPP"
+fi
+  CPP="$ac_cv_prog_CPP"
+else
+  ac_cv_prog_CPP="$CPP"
+fi
+echo "$ac_t""$CPP" 1>&6
+
+echo $ac_n "checking for ANSI C header files""... $ac_c" 1>&6
+echo "configure:1384: checking for ANSI C header files" >&5
+if eval "test \"`echo '$''{'ac_cv_header_stdc'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1389 "configure"
+#include "confdefs.h"
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <float.h>
+EOF
+ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
+{ (eval echo configure:1397: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
+if test -z "$ac_err"; then
+  rm -rf conftest*
+  ac_cv_header_stdc=yes
+else
+  echo "$ac_err" >&5
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  ac_cv_header_stdc=no
+fi
+rm -f conftest*
+
+if test $ac_cv_header_stdc = yes; then
+  # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
+cat > conftest.$ac_ext <<EOF
+#line 1414 "configure"
+#include "confdefs.h"
+#include <string.h>
+EOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  egrep "memchr" >/dev/null 2>&1; then
+  :
+else
+  rm -rf conftest*
+  ac_cv_header_stdc=no
+fi
+rm -f conftest*
+
+fi
+
+if test $ac_cv_header_stdc = yes; then
+  # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
+cat > conftest.$ac_ext <<EOF
+#line 1432 "configure"
+#include "confdefs.h"
+#include <stdlib.h>
+EOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  egrep "free" >/dev/null 2>&1; then
+  :
+else
+  rm -rf conftest*
+  ac_cv_header_stdc=no
+fi
+rm -f conftest*
+
+fi
+
+if test $ac_cv_header_stdc = yes; then
+  # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi.
+if test "$cross_compiling" = yes; then
+  :
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1453 "configure"
+#include "confdefs.h"
+#include <ctype.h>
+#define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
+#define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
+#define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
+int main () { int i; for (i = 0; i < 256; i++)
+if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2);
+exit (0); }
+
+EOF
+if { (eval echo configure:1464: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+then
+  :
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -fr conftest*
+  ac_cv_header_stdc=no
+fi
+rm -fr conftest*
+fi
+
+fi
+fi
+
+echo "$ac_t""$ac_cv_header_stdc" 1>&6
+if test $ac_cv_header_stdc = yes; then
+  cat >> confdefs.h <<\EOF
+#define STDC_HEADERS 1
+EOF
+
+fi
+
+echo $ac_n "checking for Cygwin environment""... $ac_c" 1>&6
+echo "configure:1488: checking for Cygwin environment" >&5
+if eval "test \"`echo '$''{'ac_cv_cygwin'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1493 "configure"
+#include "confdefs.h"
+
+int main() {
+
+#ifndef __CYGWIN__
+#define __CYGWIN__ __CYGWIN32__
+#endif
+return __CYGWIN__;
+; return 0; }
+EOF
+if { (eval echo configure:1504: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  ac_cv_cygwin=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  ac_cv_cygwin=no
+fi
+rm -f conftest*
+rm -f conftest*
+fi
+
+echo "$ac_t""$ac_cv_cygwin" 1>&6
+CYGWIN=
+test "$ac_cv_cygwin" = yes && CYGWIN=yes
+echo $ac_n "checking for mingw32 environment""... $ac_c" 1>&6
+echo "configure:1521: checking for mingw32 environment" >&5
+if eval "test \"`echo '$''{'ac_cv_mingw32'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1526 "configure"
+#include "confdefs.h"
+
+int main() {
+return __MINGW32__;
+; return 0; }
+EOF
+if { (eval echo configure:1533: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  ac_cv_mingw32=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  ac_cv_mingw32=no
+fi
+rm -f conftest*
+rm -f conftest*
+fi
+
+echo "$ac_t""$ac_cv_mingw32" 1>&6
+MINGW32=
+test "$ac_cv_mingw32" = yes && MINGW32=yes
+
+
+echo $ac_n "checking for executable suffix""... $ac_c" 1>&6
+echo "configure:1552: checking for executable suffix" >&5
+if eval "test \"`echo '$''{'ac_cv_exeext'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test "$CYGWIN" = yes || test "$MINGW32" = yes; then
+  ac_cv_exeext=.exe
+else
+  rm -f conftest*
+  echo 'int main () { return 0; }' > conftest.$ac_ext
+  ac_cv_exeext=
+  if { (eval echo configure:1562: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+    for file in conftest.*; do
+      case $file in
+      *.c | *.o | *.obj) ;;
+      *) ac_cv_exeext=`echo $file | sed -e s/conftest//` ;;
+      esac
+    done
+  else
+    { echo "configure: error: installation or configuration problem: compiler cannot create executables." 1>&2; exit 1; }
+  fi
+  rm -f conftest*
+  test x"${ac_cv_exeext}" = x && ac_cv_exeext=no
+fi
+fi
+
+EXEEXT=""
+test x"${ac_cv_exeext}" != xno && EXEEXT=${ac_cv_exeext}
+echo "$ac_t""${ac_cv_exeext}" 1>&6
+ac_exeext=$EXEEXT
+
+echo $ac_n "checking for object suffix""... $ac_c" 1>&6
+echo "configure:1583: checking for object suffix" >&5
+if eval "test \"`echo '$''{'ac_cv_objext'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  rm -f conftest*
+echo 'int i = 1;' > conftest.$ac_ext
+if { (eval echo configure:1589: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  for ac_file in conftest.*; do
+    case $ac_file in
+    *.c) ;;
+    *) ac_cv_objext=`echo $ac_file | sed -e s/conftest.//` ;;
+    esac
+  done
+else
+  { echo "configure: error: installation or configuration problem; compiler does not work" 1>&2; exit 1; }
+fi
+rm -f conftest*
+fi
+
+echo "$ac_t""$ac_cv_objext" 1>&6
+OBJEXT=$ac_cv_objext
+ac_objext=$ac_cv_objext
+
+
+
+trap '' 1 2 15
+cat > confcache <<\EOF
+# This file is a shell script that caches the results of configure
+# tests run on this system so they can be shared between configure
+# scripts and configure runs.  It is not useful on other systems.
+# If it contains results you don't want to keep, you may remove or edit it.
+#
+# By default, configure uses ./config.cache as the cache file,
+# creating it if it does not exist already.  You can give configure
+# the --cache-file=FILE option to use a different cache file; that is
+# what configure does when it calls configure scripts in
+# subdirectories, so they share the cache.
+# Giving --cache-file=/dev/null disables caching, for debugging configure.
+# config.status only pays attention to the cache file if you give it the
+# --recheck option to rerun configure.
+#
+EOF
+# The following way of writing the cache mishandles newlines in values,
+# but we know of no workaround that is simple, portable, and efficient.
+# So, don't put newlines in cache variables' values.
+# Ultrix sh set writes to stderr and can't be redirected directly,
+# and sets the high bit in the cache file unless we assign to the vars.
+(set) 2>&1 |
+  case `(ac_space=' '; set | grep ac_space) 2>&1` in
+  *ac_space=\ *)
+    # `set' does not quote correctly, so add quotes (double-quote substitution
+    # turns \\\\ into \\, and sed turns \\ into \).
+    sed -n \
+      -e "s/'/'\\\\''/g" \
+      -e "s/^\\([a-zA-Z0-9_]*_cv_[a-zA-Z0-9_]*\\)=\\(.*\\)/\\1=\${\\1='\\2'}/p"
+    ;;
+  *)
+    # `set' quotes correctly as required by POSIX, so do not add quotes.
+    sed -n -e 's/^\([a-zA-Z0-9_]*_cv_[a-zA-Z0-9_]*\)=\(.*\)/\1=${\1=\2}/p'
+    ;;
+  esac >> confcache
+if cmp -s $cache_file confcache; then
+  :
+else
+  if test -w $cache_file; then
+    echo "updating cache $cache_file"
+    cat confcache > $cache_file
+  else
+    echo "not updating unwritable cache $cache_file"
+  fi
+fi
+rm -f confcache
+
+trap 'rm -fr conftest* confdefs* core core.* *.core $ac_clean_files; exit 1' 1 2 15
+
+test "x$prefix" = xNONE && prefix=$ac_default_prefix
+# Let make expand exec_prefix.
+test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
+
+# Any assignment to VPATH causes Sun make to only execute
+# the first set of double-colon rules, so remove it if not needed.
+# If there is a colon in the path, we need to keep it.
+if test "x$srcdir" = x.; then
+  ac_vpsub='/^[ 	]*VPATH[ 	]*=[^:]*$/d'
+fi
+
+trap 'rm -f $CONFIG_STATUS conftest*; exit 1' 1 2 15
+
+# Transform confdefs.h into DEFS.
+# Protect against shell expansion while executing Makefile rules.
+# Protect against Makefile macro expansion.
+cat > conftest.defs <<\EOF
+s%#define \([A-Za-z_][A-Za-z0-9_]*\) *\(.*\)%-D\1=\2%g
+s%[ 	`~#$^&*(){}\\|;'"<>?]%\\&%g
+s%\[%\\&%g
+s%\]%\\&%g
+s%\$%$$%g
+EOF
+DEFS=`sed -f conftest.defs confdefs.h | tr '\012' ' '`
+rm -f conftest.defs
+
+
+# Without the "./", some shells look in PATH for config.status.
+: ${CONFIG_STATUS=./config.status}
+
+echo creating $CONFIG_STATUS
+rm -f $CONFIG_STATUS
+cat > $CONFIG_STATUS <<EOF
+#! /bin/sh
+# Generated automatically by configure.
+# Run this file to recreate the current configuration.
+# This directory was configured as follows,
+# on host `(hostname || uname -n) 2>/dev/null | sed 1q`:
+#
+# $0 $ac_configure_args
+#
+# Compiler output produced by configure, useful for debugging
+# configure, is in ./config.log if it exists.
+
+ac_cs_usage="Usage: $CONFIG_STATUS [--recheck] [--version] [--help]"
+for ac_option
+do
+  case "\$ac_option" in
+  -recheck | --recheck | --rechec | --reche | --rech | --rec | --re | --r)
+    echo "running \${CONFIG_SHELL-/bin/sh} $0 $ac_configure_args --no-create --no-recursion"
+    exec \${CONFIG_SHELL-/bin/sh} $0 $ac_configure_args --no-create --no-recursion ;;
+  -version | --version | --versio | --versi | --vers | --ver | --ve | --v)
+    echo "$CONFIG_STATUS generated by autoconf version 2.13"
+    exit 0 ;;
+  -help | --help | --hel | --he | --h)
+    echo "\$ac_cs_usage"; exit 0 ;;
+  *) echo "\$ac_cs_usage"; exit 1 ;;
+  esac
+done
+
+ac_given_srcdir=$srcdir
+ac_given_INSTALL="$INSTALL"
+
+trap 'rm -fr `echo "Makefile" | sed "s/:[^ ]*//g"` conftest*; exit 1' 1 2 15
+EOF
+cat >> $CONFIG_STATUS <<EOF
+
+# Protect against being on the right side of a sed subst in config.status.
+sed 's/%@/@@/; s/@%/@@/; s/%g\$/@g/; /@g\$/s/[\\\\&%]/\\\\&/g;
+ s/@@/%@/; s/@@/@%/; s/@g\$/%g/' > conftest.subs <<\\CEOF
+$ac_vpsub
+$extrasub
+s%@SHELL@%$SHELL%g
+s%@CFLAGS@%$CFLAGS%g
+s%@CPPFLAGS@%$CPPFLAGS%g
+s%@CXXFLAGS@%$CXXFLAGS%g
+s%@FFLAGS@%$FFLAGS%g
+s%@DEFS@%$DEFS%g
+s%@LDFLAGS@%$LDFLAGS%g
+s%@LIBS@%$LIBS%g
+s%@exec_prefix@%$exec_prefix%g
+s%@prefix@%$prefix%g
+s%@program_transform_name@%$program_transform_name%g
+s%@bindir@%$bindir%g
+s%@sbindir@%$sbindir%g
+s%@libexecdir@%$libexecdir%g
+s%@datadir@%$datadir%g
+s%@sysconfdir@%$sysconfdir%g
+s%@sharedstatedir@%$sharedstatedir%g
+s%@localstatedir@%$localstatedir%g
+s%@libdir@%$libdir%g
+s%@includedir@%$includedir%g
+s%@oldincludedir@%$oldincludedir%g
+s%@infodir@%$infodir%g
+s%@mandir@%$mandir%g
+s%@INSTALL_PROGRAM@%$INSTALL_PROGRAM%g
+s%@INSTALL_SCRIPT@%$INSTALL_SCRIPT%g
+s%@INSTALL_DATA@%$INSTALL_DATA%g
+s%@PACKAGE@%$PACKAGE%g
+s%@VERSION@%$VERSION%g
+s%@ACLOCAL@%$ACLOCAL%g
+s%@AUTOCONF@%$AUTOCONF%g
+s%@AUTOMAKE@%$AUTOMAKE%g
+s%@AUTOHEADER@%$AUTOHEADER%g
+s%@MAKEINFO@%$MAKEINFO%g
+s%@SET_MAKE@%$SET_MAKE%g
+s%@MAINTAINER_MODE_TRUE@%$MAINTAINER_MODE_TRUE%g
+s%@MAINTAINER_MODE_FALSE@%$MAINTAINER_MODE_FALSE%g
+s%@MAINT@%$MAINT%g
+s%@host@%$host%g
+s%@host_alias@%$host_alias%g
+s%@host_cpu@%$host_cpu%g
+s%@host_vendor@%$host_vendor%g
+s%@host_os@%$host_os%g
+s%@build@%$build%g
+s%@build_alias@%$build_alias%g
+s%@build_cpu@%$build_cpu%g
+s%@build_vendor@%$build_vendor%g
+s%@build_os@%$build_os%g
+s%@AR@%$AR%g
+s%@NM@%$NM%g
+s%@RANLIB@%$RANLIB%g
+s%@CC@%$CC%g
+s%@CPP@%$CPP%g
+s%@EXEEXT@%$EXEEXT%g
+s%@OBJEXT@%$OBJEXT%g
+s%@installdata@%$installdata%g
+s%@uninstalldata@%$uninstalldata%g
+
+CEOF
+EOF
+
+cat >> $CONFIG_STATUS <<\EOF
+
+# Split the substitutions into bite-sized pieces for seds with
+# small command number limits, like on Digital OSF/1 and HP-UX.
+ac_max_sed_cmds=90 # Maximum number of lines to put in a sed script.
+ac_file=1 # Number of current file.
+ac_beg=1 # First line for current file.
+ac_end=$ac_max_sed_cmds # Line after last line for current file.
+ac_more_lines=:
+ac_sed_cmds=""
+while $ac_more_lines; do
+  if test $ac_beg -gt 1; then
+    sed "1,${ac_beg}d; ${ac_end}q" conftest.subs > conftest.s$ac_file
+  else
+    sed "${ac_end}q" conftest.subs > conftest.s$ac_file
+  fi
+  if test ! -s conftest.s$ac_file; then
+    ac_more_lines=false
+    rm -f conftest.s$ac_file
+  else
+    if test -z "$ac_sed_cmds"; then
+      ac_sed_cmds="sed -f conftest.s$ac_file"
+    else
+      ac_sed_cmds="$ac_sed_cmds | sed -f conftest.s$ac_file"
+    fi
+    ac_file=`expr $ac_file + 1`
+    ac_beg=$ac_end
+    ac_end=`expr $ac_end + $ac_max_sed_cmds`
+  fi
+done
+if test -z "$ac_sed_cmds"; then
+  ac_sed_cmds=cat
+fi
+EOF
+
+cat >> $CONFIG_STATUS <<EOF
+
+CONFIG_FILES=\${CONFIG_FILES-"Makefile"}
+EOF
+cat >> $CONFIG_STATUS <<\EOF
+for ac_file in .. $CONFIG_FILES; do if test "x$ac_file" != x..; then
+  # Support "outfile[:infile[:infile...]]", defaulting infile="outfile.in".
+  case "$ac_file" in
+  *:*) ac_file_in=`echo "$ac_file"|sed 's%[^:]*:%%'`
+       ac_file=`echo "$ac_file"|sed 's%:.*%%'` ;;
+  *) ac_file_in="${ac_file}.in" ;;
+  esac
+
+  # Adjust a relative srcdir, top_srcdir, and INSTALL for subdirectories.
+
+  # Remove last slash and all that follows it.  Not all systems have dirname.
+  ac_dir=`echo $ac_file|sed 's%/[^/][^/]*$%%'`
+  if test "$ac_dir" != "$ac_file" && test "$ac_dir" != .; then
+    # The file is in a subdirectory.
+    test ! -d "$ac_dir" && mkdir "$ac_dir"
+    ac_dir_suffix="/`echo $ac_dir|sed 's%^\./%%'`"
+    # A "../" for each directory in $ac_dir_suffix.
+    ac_dots=`echo $ac_dir_suffix|sed 's%/[^/]*%../%g'`
+  else
+    ac_dir_suffix= ac_dots=
+  fi
+
+  case "$ac_given_srcdir" in
+  .)  srcdir=.
+      if test -z "$ac_dots"; then top_srcdir=.
+      else top_srcdir=`echo $ac_dots|sed 's%/$%%'`; fi ;;
+  /*) srcdir="$ac_given_srcdir$ac_dir_suffix"; top_srcdir="$ac_given_srcdir" ;;
+  *) # Relative path.
+    srcdir="$ac_dots$ac_given_srcdir$ac_dir_suffix"
+    top_srcdir="$ac_dots$ac_given_srcdir" ;;
+  esac
+
+  case "$ac_given_INSTALL" in
+  [/$]*) INSTALL="$ac_given_INSTALL" ;;
+  *) INSTALL="$ac_dots$ac_given_INSTALL" ;;
+  esac
+
+  echo creating "$ac_file"
+  rm -f "$ac_file"
+  configure_input="Generated automatically from `echo $ac_file_in|sed 's%.*/%%'` by configure."
+  case "$ac_file" in
+  *Makefile*) ac_comsub="1i\\
+# $configure_input" ;;
+  *) ac_comsub= ;;
+  esac
+
+  ac_file_inputs=`echo $ac_file_in|sed -e "s%^%$ac_given_srcdir/%" -e "s%:% $ac_given_srcdir/%g"`
+  sed -e "$ac_comsub
+s%@configure_input@%$configure_input%g
+s%@srcdir@%$srcdir%g
+s%@top_srcdir@%$top_srcdir%g
+s%@INSTALL@%$INSTALL%g
+" $ac_file_inputs | (eval "$ac_sed_cmds") > $ac_file
+fi; done
+rm -f conftest.s*
+
+EOF
+cat >> $CONFIG_STATUS <<EOF
+
+EOF
+cat >> $CONFIG_STATUS <<\EOF
+
+exit 0
+EOF
+chmod +x $CONFIG_STATUS
+rm -fr confdefs* $ac_clean_files
+test "$no_create" = yes || ${CONFIG_SHELL-/bin/sh} $CONFIG_STATUS || exit 1
+
diff --git a/winsup/bz2lib/configure.in b/winsup/bz2lib/configure.in
new file mode 100644
index 000000000..e65d0e2b6
--- /dev/null
+++ b/winsup/bz2lib/configure.in
@@ -0,0 +1,65 @@
+dnl Process this file with autoconf to produce a configure script.
+
+AC_PREREQ(2.13)
+
+AC_INIT(bzlib.h)
+AC_CONFIG_AUX_DIR(`cd $srcdir/../..;pwd`)
+AM_INIT_AUTOMAKE(libbz2, 0.0)
+AM_MAINTAINER_MODE
+
+# FIXME: We temporarily define our own version of AC_PROG_CC.  This is
+# copied from autoconf 2.12, but does not call AC_PROG_CC_WORKS.  We
+# are probably using a cross compiler, which will not be able to fully
+# link an executable.  This should really be fixed in autoconf
+# itself.
+
+AC_DEFUN(LIB_AC_PROG_CC,
+[AC_BEFORE([$0], [AC_PROG_CPP])dnl
+AC_CHECK_TOOL(CC, gcc, gcc)
+if test -z "$CC"; then
+  AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc)
+  test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH])
+fi
+
+AC_PROG_CC_GNU
+
+if test $ac_cv_prog_gcc = yes; then
+  GCC=yes
+dnl Check whether -g works, even if CFLAGS is set, in case the package
+dnl plays around with CFLAGS (such as to build both debugging and
+dnl normal versions of a library), tasteless as that idea is.
+  ac_test_CFLAGS="${CFLAGS+set}"
+  ac_save_CFLAGS="$CFLAGS"
+  CFLAGS=
+  AC_PROG_CC_G
+  if test "$ac_test_CFLAGS" = set; then
+    CFLAGS="$ac_save_CFLAGS"
+  elif test $ac_cv_prog_cc_g = yes; then
+    CFLAGS="-gstabs+ -O2"
+  else
+    CFLAGS="-O2"
+  fi
+  if test "$ac_test_CXXFLAGS" != set; then
+    CXXFLAGS='$(CFLAGS)'
+  fi
+else
+  GCC=
+  test "${CFLAGS+set}" = set || CFLAGS="-g"
+fi
+])
+
+CPPFLAGS=-U_WIN32
+AC_CANONICAL_HOST
+AC_CHECK_TOOL(AR, ar, ar)
+AC_CHECK_TOOL(NM, nm, nm)
+AC_CHECK_TOOL(RANLIB, ranlib, ranlib)
+LIB_AC_PROG_CC
+AC_PROG_INSTALL
+AC_STDC_HEADERS
+AC_EXEEXT
+AC_OBJEXT
+
+AC_SUBST(installdata)dnl
+AC_SUBST(uninstalldata)dnl
+
+AC_OUTPUT([Makefile])
diff --git a/winsup/bz2lib/crctable.c b/winsup/bz2lib/crctable.c
new file mode 100644
index 000000000..61c040c4f
--- /dev/null
+++ b/winsup/bz2lib/crctable.c
@@ -0,0 +1,144 @@
+
+/*-------------------------------------------------------------*/
+/*--- Table for doing CRCs                                  ---*/
+/*---                                            crctable.c ---*/
+/*-------------------------------------------------------------*/
+
+/*--
+  This file is a part of bzip2 and/or libbzip2, a program and
+  library for lossless, block-sorting data compression.
+
+  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+  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. 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.
+
+  3. Altered source versions must be plainly marked as such, and must
+     not be misrepresented as being the original software.
+
+  4. 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.
+
+  Julian Seward, Cambridge, UK.
+  jseward@acm.org
+  bzip2/libbzip2 version 1.0 of 21 March 2000
+
+  This program is based on (at least) the work of:
+     Mike Burrows
+     David Wheeler
+     Peter Fenwick
+     Alistair Moffat
+     Radford Neal
+     Ian H. Witten
+     Robert Sedgewick
+     Jon L. Bentley
+
+  For more information on these sources, see the manual.
+--*/
+
+
+#include "bzlib_private.h"
+
+/*--
+  I think this is an implementation of the AUTODIN-II,
+  Ethernet & FDDI 32-bit CRC standard.  Vaguely derived
+  from code by Rob Warnock, in Section 51 of the
+  comp.compression FAQ.
+--*/
+
+UInt32 BZ2_crc32Table[256] = {
+
+   /*-- Ugly, innit? --*/
+
+   0x00000000L, 0x04c11db7L, 0x09823b6eL, 0x0d4326d9L,
+   0x130476dcL, 0x17c56b6bL, 0x1a864db2L, 0x1e475005L,
+   0x2608edb8L, 0x22c9f00fL, 0x2f8ad6d6L, 0x2b4bcb61L,
+   0x350c9b64L, 0x31cd86d3L, 0x3c8ea00aL, 0x384fbdbdL,
+   0x4c11db70L, 0x48d0c6c7L, 0x4593e01eL, 0x4152fda9L,
+   0x5f15adacL, 0x5bd4b01bL, 0x569796c2L, 0x52568b75L,
+   0x6a1936c8L, 0x6ed82b7fL, 0x639b0da6L, 0x675a1011L,
+   0x791d4014L, 0x7ddc5da3L, 0x709f7b7aL, 0x745e66cdL,
+   0x9823b6e0L, 0x9ce2ab57L, 0x91a18d8eL, 0x95609039L,
+   0x8b27c03cL, 0x8fe6dd8bL, 0x82a5fb52L, 0x8664e6e5L,
+   0xbe2b5b58L, 0xbaea46efL, 0xb7a96036L, 0xb3687d81L,
+   0xad2f2d84L, 0xa9ee3033L, 0xa4ad16eaL, 0xa06c0b5dL,
+   0xd4326d90L, 0xd0f37027L, 0xddb056feL, 0xd9714b49L,
+   0xc7361b4cL, 0xc3f706fbL, 0xceb42022L, 0xca753d95L,
+   0xf23a8028L, 0xf6fb9d9fL, 0xfbb8bb46L, 0xff79a6f1L,
+   0xe13ef6f4L, 0xe5ffeb43L, 0xe8bccd9aL, 0xec7dd02dL,
+   0x34867077L, 0x30476dc0L, 0x3d044b19L, 0x39c556aeL,
+   0x278206abL, 0x23431b1cL, 0x2e003dc5L, 0x2ac12072L,
+   0x128e9dcfL, 0x164f8078L, 0x1b0ca6a1L, 0x1fcdbb16L,
+   0x018aeb13L, 0x054bf6a4L, 0x0808d07dL, 0x0cc9cdcaL,
+   0x7897ab07L, 0x7c56b6b0L, 0x71159069L, 0x75d48ddeL,
+   0x6b93dddbL, 0x6f52c06cL, 0x6211e6b5L, 0x66d0fb02L,
+   0x5e9f46bfL, 0x5a5e5b08L, 0x571d7dd1L, 0x53dc6066L,
+   0x4d9b3063L, 0x495a2dd4L, 0x44190b0dL, 0x40d816baL,
+   0xaca5c697L, 0xa864db20L, 0xa527fdf9L, 0xa1e6e04eL,
+   0xbfa1b04bL, 0xbb60adfcL, 0xb6238b25L, 0xb2e29692L,
+   0x8aad2b2fL, 0x8e6c3698L, 0x832f1041L, 0x87ee0df6L,
+   0x99a95df3L, 0x9d684044L, 0x902b669dL, 0x94ea7b2aL,
+   0xe0b41de7L, 0xe4750050L, 0xe9362689L, 0xedf73b3eL,
+   0xf3b06b3bL, 0xf771768cL, 0xfa325055L, 0xfef34de2L,
+   0xc6bcf05fL, 0xc27dede8L, 0xcf3ecb31L, 0xcbffd686L,
+   0xd5b88683L, 0xd1799b34L, 0xdc3abdedL, 0xd8fba05aL,
+   0x690ce0eeL, 0x6dcdfd59L, 0x608edb80L, 0x644fc637L,
+   0x7a089632L, 0x7ec98b85L, 0x738aad5cL, 0x774bb0ebL,
+   0x4f040d56L, 0x4bc510e1L, 0x46863638L, 0x42472b8fL,
+   0x5c007b8aL, 0x58c1663dL, 0x558240e4L, 0x51435d53L,
+   0x251d3b9eL, 0x21dc2629L, 0x2c9f00f0L, 0x285e1d47L,
+   0x36194d42L, 0x32d850f5L, 0x3f9b762cL, 0x3b5a6b9bL,
+   0x0315d626L, 0x07d4cb91L, 0x0a97ed48L, 0x0e56f0ffL,
+   0x1011a0faL, 0x14d0bd4dL, 0x19939b94L, 0x1d528623L,
+   0xf12f560eL, 0xf5ee4bb9L, 0xf8ad6d60L, 0xfc6c70d7L,
+   0xe22b20d2L, 0xe6ea3d65L, 0xeba91bbcL, 0xef68060bL,
+   0xd727bbb6L, 0xd3e6a601L, 0xdea580d8L, 0xda649d6fL,
+   0xc423cd6aL, 0xc0e2d0ddL, 0xcda1f604L, 0xc960ebb3L,
+   0xbd3e8d7eL, 0xb9ff90c9L, 0xb4bcb610L, 0xb07daba7L,
+   0xae3afba2L, 0xaafbe615L, 0xa7b8c0ccL, 0xa379dd7bL,
+   0x9b3660c6L, 0x9ff77d71L, 0x92b45ba8L, 0x9675461fL,
+   0x8832161aL, 0x8cf30badL, 0x81b02d74L, 0x857130c3L,
+   0x5d8a9099L, 0x594b8d2eL, 0x5408abf7L, 0x50c9b640L,
+   0x4e8ee645L, 0x4a4ffbf2L, 0x470cdd2bL, 0x43cdc09cL,
+   0x7b827d21L, 0x7f436096L, 0x7200464fL, 0x76c15bf8L,
+   0x68860bfdL, 0x6c47164aL, 0x61043093L, 0x65c52d24L,
+   0x119b4be9L, 0x155a565eL, 0x18197087L, 0x1cd86d30L,
+   0x029f3d35L, 0x065e2082L, 0x0b1d065bL, 0x0fdc1becL,
+   0x3793a651L, 0x3352bbe6L, 0x3e119d3fL, 0x3ad08088L,
+   0x2497d08dL, 0x2056cd3aL, 0x2d15ebe3L, 0x29d4f654L,
+   0xc5a92679L, 0xc1683bceL, 0xcc2b1d17L, 0xc8ea00a0L,
+   0xd6ad50a5L, 0xd26c4d12L, 0xdf2f6bcbL, 0xdbee767cL,
+   0xe3a1cbc1L, 0xe760d676L, 0xea23f0afL, 0xeee2ed18L,
+   0xf0a5bd1dL, 0xf464a0aaL, 0xf9278673L, 0xfde69bc4L,
+   0x89b8fd09L, 0x8d79e0beL, 0x803ac667L, 0x84fbdbd0L,
+   0x9abc8bd5L, 0x9e7d9662L, 0x933eb0bbL, 0x97ffad0cL,
+   0xafb010b1L, 0xab710d06L, 0xa6322bdfL, 0xa2f33668L,
+   0xbcb4666dL, 0xb8757bdaL, 0xb5365d03L, 0xb1f740b4L
+};
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                        crctable.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/winsup/bz2lib/decompress.c b/winsup/bz2lib/decompress.c
new file mode 100644
index 000000000..cdced1889
--- /dev/null
+++ b/winsup/bz2lib/decompress.c
@@ -0,0 +1,660 @@
+
+/*-------------------------------------------------------------*/
+/*--- Decompression machinery                               ---*/
+/*---                                          decompress.c ---*/
+/*-------------------------------------------------------------*/
+
+/*--
+  This file is a part of bzip2 and/or libbzip2, a program and
+  library for lossless, block-sorting data compression.
+
+  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+  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. 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.
+
+  3. Altered source versions must be plainly marked as such, and must
+     not be misrepresented as being the original software.
+
+  4. 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.
+
+  Julian Seward, Cambridge, UK.
+  jseward@acm.org
+  bzip2/libbzip2 version 1.0 of 21 March 2000
+
+  This program is based on (at least) the work of:
+     Mike Burrows
+     David Wheeler
+     Peter Fenwick
+     Alistair Moffat
+     Radford Neal
+     Ian H. Witten
+     Robert Sedgewick
+     Jon L. Bentley
+
+  For more information on these sources, see the manual.
+--*/
+
+
+#include "bzlib_private.h"
+
+
+/*---------------------------------------------------*/
+static
+void makeMaps_d ( DState* s )
+{
+   Int32 i;
+   s->nInUse = 0;
+   for (i = 0; i < 256; i++)
+      if (s->inUse[i]) {
+         s->seqToUnseq[s->nInUse] = i;
+         s->nInUse++;
+      }
+}
+
+
+/*---------------------------------------------------*/
+#define RETURN(rrr)                               \
+   { retVal = rrr; goto save_state_and_return; };
+
+#define GET_BITS(lll,vvv,nnn)                     \
+   case lll: s->state = lll;                      \
+   while (True) {                                 \
+      if (s->bsLive >= nnn) {                     \
+         UInt32 v;                                \
+         v = (s->bsBuff >>                        \
+             (s->bsLive-nnn)) & ((1 << nnn)-1);   \
+         s->bsLive -= nnn;                        \
+         vvv = v;                                 \
+         break;                                   \
+      }                                           \
+      if (s->strm->avail_in == 0) RETURN(BZ_OK);  \
+      s->bsBuff                                   \
+         = (s->bsBuff << 8) |                     \
+           ((UInt32)                              \
+              (*((UChar*)(s->strm->next_in))));   \
+      s->bsLive += 8;                             \
+      s->strm->next_in++;                         \
+      s->strm->avail_in--;                        \
+      s->strm->total_in_lo32++;                   \
+      if (s->strm->total_in_lo32 == 0)            \
+         s->strm->total_in_hi32++;                \
+   }
+
+#define GET_UCHAR(lll,uuu)                        \
+   GET_BITS(lll,uuu,8)
+
+#define GET_BIT(lll,uuu)                          \
+   GET_BITS(lll,uuu,1)
+
+/*---------------------------------------------------*/
+#define GET_MTF_VAL(label1,label2,lval)           \
+{                                                 \
+   if (groupPos == 0) {                           \
+      groupNo++;                                  \
+      if (groupNo >= nSelectors)                  \
+         RETURN(BZ_DATA_ERROR);                   \
+      groupPos = BZ_G_SIZE;                       \
+      gSel = s->selector[groupNo];                \
+      gMinlen = s->minLens[gSel];                 \
+      gLimit = &(s->limit[gSel][0]);              \
+      gPerm = &(s->perm[gSel][0]);                \
+      gBase = &(s->base[gSel][0]);                \
+   }                                              \
+   groupPos--;                                    \
+   zn = gMinlen;                                  \
+   GET_BITS(label1, zvec, zn);                    \
+   while (1) {                                    \
+      if (zn > 20 /* the longest code */)         \
+         RETURN(BZ_DATA_ERROR);                   \
+      if (zvec <= gLimit[zn]) break;              \
+      zn++;                                       \
+      GET_BIT(label2, zj);                        \
+      zvec = (zvec << 1) | zj;                    \
+   };                                             \
+   if (zvec - gBase[zn] < 0                       \
+       || zvec - gBase[zn] >= BZ_MAX_ALPHA_SIZE)  \
+      RETURN(BZ_DATA_ERROR);                      \
+   lval = gPerm[zvec - gBase[zn]];                \
+}
+
+
+/*---------------------------------------------------*/
+Int32 BZ2_decompress ( DState* s )
+{
+   UChar      uc;
+   Int32      retVal;
+   Int32      minLen, maxLen;
+   bz_stream* strm = s->strm;
+
+   /* stuff that needs to be saved/restored */
+   Int32  i;
+   Int32  j;
+   Int32  t;
+   Int32  alphaSize;
+   Int32  nGroups;
+   Int32  nSelectors;
+   Int32  EOB;
+   Int32  groupNo;
+   Int32  groupPos;
+   Int32  nextSym;
+   Int32  nblockMAX;
+   Int32  nblock;
+   Int32  es;
+   Int32  N;
+   Int32  curr;
+   Int32  zt;
+   Int32  zn; 
+   Int32  zvec;
+   Int32  zj;
+   Int32  gSel;
+   Int32  gMinlen;
+   Int32* gLimit;
+   Int32* gBase;
+   Int32* gPerm;
+
+   if (s->state == BZ_X_MAGIC_1) {
+      /*initialise the save area*/
+      s->save_i           = 0;
+      s->save_j           = 0;
+      s->save_t           = 0;
+      s->save_alphaSize   = 0;
+      s->save_nGroups     = 0;
+      s->save_nSelectors  = 0;
+      s->save_EOB         = 0;
+      s->save_groupNo     = 0;
+      s->save_groupPos    = 0;
+      s->save_nextSym     = 0;
+      s->save_nblockMAX   = 0;
+      s->save_nblock      = 0;
+      s->save_es          = 0;
+      s->save_N           = 0;
+      s->save_curr        = 0;
+      s->save_zt          = 0;
+      s->save_zn          = 0;
+      s->save_zvec        = 0;
+      s->save_zj          = 0;
+      s->save_gSel        = 0;
+      s->save_gMinlen     = 0;
+      s->save_gLimit      = NULL;
+      s->save_gBase       = NULL;
+      s->save_gPerm       = NULL;
+   }
+
+   /*restore from the save area*/
+   i           = s->save_i;
+   j           = s->save_j;
+   t           = s->save_t;
+   alphaSize   = s->save_alphaSize;
+   nGroups     = s->save_nGroups;
+   nSelectors  = s->save_nSelectors;
+   EOB         = s->save_EOB;
+   groupNo     = s->save_groupNo;
+   groupPos    = s->save_groupPos;
+   nextSym     = s->save_nextSym;
+   nblockMAX   = s->save_nblockMAX;
+   nblock      = s->save_nblock;
+   es          = s->save_es;
+   N           = s->save_N;
+   curr        = s->save_curr;
+   zt          = s->save_zt;
+   zn          = s->save_zn; 
+   zvec        = s->save_zvec;
+   zj          = s->save_zj;
+   gSel        = s->save_gSel;
+   gMinlen     = s->save_gMinlen;
+   gLimit      = s->save_gLimit;
+   gBase       = s->save_gBase;
+   gPerm       = s->save_gPerm;
+
+   retVal = BZ_OK;
+
+   switch (s->state) {
+
+      GET_UCHAR(BZ_X_MAGIC_1, uc);
+      if (uc != 'B') RETURN(BZ_DATA_ERROR_MAGIC);
+
+      GET_UCHAR(BZ_X_MAGIC_2, uc);
+      if (uc != 'Z') RETURN(BZ_DATA_ERROR_MAGIC);
+
+      GET_UCHAR(BZ_X_MAGIC_3, uc)
+      if (uc != 'h') RETURN(BZ_DATA_ERROR_MAGIC);
+
+      GET_BITS(BZ_X_MAGIC_4, s->blockSize100k, 8)
+      if (s->blockSize100k < '1' || 
+          s->blockSize100k > '9') RETURN(BZ_DATA_ERROR_MAGIC);
+      s->blockSize100k -= '0';
+
+      if (s->smallDecompress) {
+         s->ll16 = BZALLOC( s->blockSize100k * 100000 * sizeof(UInt16) );
+         s->ll4  = BZALLOC( 
+                      ((1 + s->blockSize100k * 100000) >> 1) * sizeof(UChar) 
+                   );
+         if (s->ll16 == NULL || s->ll4 == NULL) RETURN(BZ_MEM_ERROR);
+      } else {
+         s->tt  = BZALLOC( s->blockSize100k * 100000 * sizeof(Int32) );
+         if (s->tt == NULL) RETURN(BZ_MEM_ERROR);
+      }
+
+      GET_UCHAR(BZ_X_BLKHDR_1, uc);
+
+      if (uc == 0x17) goto endhdr_2;
+      if (uc != 0x31) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_BLKHDR_2, uc);
+      if (uc != 0x41) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_BLKHDR_3, uc);
+      if (uc != 0x59) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_BLKHDR_4, uc);
+      if (uc != 0x26) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_BLKHDR_5, uc);
+      if (uc != 0x53) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_BLKHDR_6, uc);
+      if (uc != 0x59) RETURN(BZ_DATA_ERROR);
+
+      s->currBlockNo++;
+      if (s->verbosity >= 2)
+         VPrintf1 ( "\n    [%d: huff+mtf ", s->currBlockNo );
+ 
+      s->storedBlockCRC = 0;
+      GET_UCHAR(BZ_X_BCRC_1, uc);
+      s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
+      GET_UCHAR(BZ_X_BCRC_2, uc);
+      s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
+      GET_UCHAR(BZ_X_BCRC_3, uc);
+      s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
+      GET_UCHAR(BZ_X_BCRC_4, uc);
+      s->storedBlockCRC = (s->storedBlockCRC << 8) | ((UInt32)uc);
+
+      GET_BITS(BZ_X_RANDBIT, s->blockRandomised, 1);
+
+      s->origPtr = 0;
+      GET_UCHAR(BZ_X_ORIGPTR_1, uc);
+      s->origPtr = (s->origPtr << 8) | ((Int32)uc);
+      GET_UCHAR(BZ_X_ORIGPTR_2, uc);
+      s->origPtr = (s->origPtr << 8) | ((Int32)uc);
+      GET_UCHAR(BZ_X_ORIGPTR_3, uc);
+      s->origPtr = (s->origPtr << 8) | ((Int32)uc);
+
+      if (s->origPtr < 0)
+         RETURN(BZ_DATA_ERROR);
+      if (s->origPtr > 10 + 100000*s->blockSize100k) 
+         RETURN(BZ_DATA_ERROR);
+
+      /*--- Receive the mapping table ---*/
+      for (i = 0; i < 16; i++) {
+         GET_BIT(BZ_X_MAPPING_1, uc);
+         if (uc == 1) 
+            s->inUse16[i] = True; else 
+            s->inUse16[i] = False;
+      }
+
+      for (i = 0; i < 256; i++) s->inUse[i] = False;
+
+      for (i = 0; i < 16; i++)
+         if (s->inUse16[i])
+            for (j = 0; j < 16; j++) {
+               GET_BIT(BZ_X_MAPPING_2, uc);
+               if (uc == 1) s->inUse[i * 16 + j] = True;
+            }
+      makeMaps_d ( s );
+      if (s->nInUse == 0) RETURN(BZ_DATA_ERROR);
+      alphaSize = s->nInUse+2;
+
+      /*--- Now the selectors ---*/
+      GET_BITS(BZ_X_SELECTOR_1, nGroups, 3);
+      if (nGroups < 2 || nGroups > 6) RETURN(BZ_DATA_ERROR);
+      GET_BITS(BZ_X_SELECTOR_2, nSelectors, 15);
+      if (nSelectors < 1) RETURN(BZ_DATA_ERROR);
+      for (i = 0; i < nSelectors; i++) {
+         j = 0;
+         while (True) {
+            GET_BIT(BZ_X_SELECTOR_3, uc);
+            if (uc == 0) break;
+            j++;
+            if (j >= nGroups) RETURN(BZ_DATA_ERROR);
+         }
+         s->selectorMtf[i] = j;
+      }
+
+      /*--- Undo the MTF values for the selectors. ---*/
+      {
+         UChar pos[BZ_N_GROUPS], tmp, v;
+         for (v = 0; v < nGroups; v++) pos[v] = v;
+   
+         for (i = 0; i < nSelectors; i++) {
+            v = s->selectorMtf[i];
+            tmp = pos[v];
+            while (v > 0) { pos[v] = pos[v-1]; v--; }
+            pos[0] = tmp;
+            s->selector[i] = tmp;
+         }
+      }
+
+      /*--- Now the coding tables ---*/
+      for (t = 0; t < nGroups; t++) {
+         GET_BITS(BZ_X_CODING_1, curr, 5);
+         for (i = 0; i < alphaSize; i++) {
+            while (True) {
+               if (curr < 1 || curr > 20) RETURN(BZ_DATA_ERROR);
+               GET_BIT(BZ_X_CODING_2, uc);
+               if (uc == 0) break;
+               GET_BIT(BZ_X_CODING_3, uc);
+               if (uc == 0) curr++; else curr--;
+            }
+            s->len[t][i] = curr;
+         }
+      }
+
+      /*--- Create the Huffman decoding tables ---*/
+      for (t = 0; t < nGroups; t++) {
+         minLen = 32;
+         maxLen = 0;
+         for (i = 0; i < alphaSize; i++) {
+            if (s->len[t][i] > maxLen) maxLen = s->len[t][i];
+            if (s->len[t][i] < minLen) minLen = s->len[t][i];
+         }
+         BZ2_hbCreateDecodeTables ( 
+            &(s->limit[t][0]), 
+            &(s->base[t][0]), 
+            &(s->perm[t][0]), 
+            &(s->len[t][0]),
+            minLen, maxLen, alphaSize
+         );
+         s->minLens[t] = minLen;
+      }
+
+      /*--- Now the MTF values ---*/
+
+      EOB      = s->nInUse+1;
+      nblockMAX = 100000 * s->blockSize100k;
+      groupNo  = -1;
+      groupPos = 0;
+
+      for (i = 0; i <= 255; i++) s->unzftab[i] = 0;
+
+      /*-- MTF init --*/
+      {
+         Int32 ii, jj, kk;
+         kk = MTFA_SIZE-1;
+         for (ii = 256 / MTFL_SIZE - 1; ii >= 0; ii--) {
+            for (jj = MTFL_SIZE-1; jj >= 0; jj--) {
+               s->mtfa[kk] = (UChar)(ii * MTFL_SIZE + jj);
+               kk--;
+            }
+            s->mtfbase[ii] = kk + 1;
+         }
+      }
+      /*-- end MTF init --*/
+
+      nblock = 0;
+      GET_MTF_VAL(BZ_X_MTF_1, BZ_X_MTF_2, nextSym);
+
+      while (True) {
+
+         if (nextSym == EOB) break;
+
+         if (nextSym == BZ_RUNA || nextSym == BZ_RUNB) {
+
+            es = -1;
+            N = 1;
+            do {
+               if (nextSym == BZ_RUNA) es = es + (0+1) * N; else
+               if (nextSym == BZ_RUNB) es = es + (1+1) * N;
+               N = N * 2;
+               GET_MTF_VAL(BZ_X_MTF_3, BZ_X_MTF_4, nextSym);
+            }
+               while (nextSym == BZ_RUNA || nextSym == BZ_RUNB);
+
+            es++;
+            uc = s->seqToUnseq[ s->mtfa[s->mtfbase[0]] ];
+            s->unzftab[uc] += es;
+
+            if (s->smallDecompress)
+               while (es > 0) {
+                  if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
+                  s->ll16[nblock] = (UInt16)uc;
+                  nblock++;
+                  es--;
+               }
+            else
+               while (es > 0) {
+                  if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
+                  s->tt[nblock] = (UInt32)uc;
+                  nblock++;
+                  es--;
+               };
+
+            continue;
+
+         } else {
+
+            if (nblock >= nblockMAX) RETURN(BZ_DATA_ERROR);
+
+            /*-- uc = MTF ( nextSym-1 ) --*/
+            {
+               Int32 ii, jj, kk, pp, lno, off;
+               UInt32 nn;
+               nn = (UInt32)(nextSym - 1);
+
+               if (nn < MTFL_SIZE) {
+                  /* avoid general-case expense */
+                  pp = s->mtfbase[0];
+                  uc = s->mtfa[pp+nn];
+                  while (nn > 3) {
+                     Int32 z = pp+nn;
+                     s->mtfa[(z)  ] = s->mtfa[(z)-1];
+                     s->mtfa[(z)-1] = s->mtfa[(z)-2];
+                     s->mtfa[(z)-2] = s->mtfa[(z)-3];
+                     s->mtfa[(z)-3] = s->mtfa[(z)-4];
+                     nn -= 4;
+                  }
+                  while (nn > 0) { 
+                     s->mtfa[(pp+nn)] = s->mtfa[(pp+nn)-1]; nn--; 
+                  };
+                  s->mtfa[pp] = uc;
+               } else { 
+                  /* general case */
+                  lno = nn / MTFL_SIZE;
+                  off = nn % MTFL_SIZE;
+                  pp = s->mtfbase[lno] + off;
+                  uc = s->mtfa[pp];
+                  while (pp > s->mtfbase[lno]) { 
+                     s->mtfa[pp] = s->mtfa[pp-1]; pp--; 
+                  };
+                  s->mtfbase[lno]++;
+                  while (lno > 0) {
+                     s->mtfbase[lno]--;
+                     s->mtfa[s->mtfbase[lno]] 
+                        = s->mtfa[s->mtfbase[lno-1] + MTFL_SIZE - 1];
+                     lno--;
+                  }
+                  s->mtfbase[0]--;
+                  s->mtfa[s->mtfbase[0]] = uc;
+                  if (s->mtfbase[0] == 0) {
+                     kk = MTFA_SIZE-1;
+                     for (ii = 256 / MTFL_SIZE-1; ii >= 0; ii--) {
+                        for (jj = MTFL_SIZE-1; jj >= 0; jj--) {
+                           s->mtfa[kk] = s->mtfa[s->mtfbase[ii] + jj];
+                           kk--;
+                        }
+                        s->mtfbase[ii] = kk + 1;
+                     }
+                  }
+               }
+            }
+            /*-- end uc = MTF ( nextSym-1 ) --*/
+
+            s->unzftab[s->seqToUnseq[uc]]++;
+            if (s->smallDecompress)
+               s->ll16[nblock] = (UInt16)(s->seqToUnseq[uc]); else
+               s->tt[nblock]   = (UInt32)(s->seqToUnseq[uc]);
+            nblock++;
+
+            GET_MTF_VAL(BZ_X_MTF_5, BZ_X_MTF_6, nextSym);
+            continue;
+         }
+      }
+
+      /* Now we know what nblock is, we can do a better sanity
+         check on s->origPtr.
+      */
+      if (s->origPtr < 0 || s->origPtr >= nblock)
+         RETURN(BZ_DATA_ERROR);
+
+      s->state_out_len = 0;
+      s->state_out_ch  = 0;
+      BZ_INITIALISE_CRC ( s->calculatedBlockCRC );
+      s->state = BZ_X_OUTPUT;
+      if (s->verbosity >= 2) VPrintf0 ( "rt+rld" );
+
+      /*-- Set up cftab to facilitate generation of T^(-1) --*/
+      s->cftab[0] = 0;
+      for (i = 1; i <= 256; i++) s->cftab[i] = s->unzftab[i-1];
+      for (i = 1; i <= 256; i++) s->cftab[i] += s->cftab[i-1];
+
+      if (s->smallDecompress) {
+
+         /*-- Make a copy of cftab, used in generation of T --*/
+         for (i = 0; i <= 256; i++) s->cftabCopy[i] = s->cftab[i];
+
+         /*-- compute the T vector --*/
+         for (i = 0; i < nblock; i++) {
+            uc = (UChar)(s->ll16[i]);
+            SET_LL(i, s->cftabCopy[uc]);
+            s->cftabCopy[uc]++;
+         }
+
+         /*-- Compute T^(-1) by pointer reversal on T --*/
+         i = s->origPtr;
+         j = GET_LL(i);
+         do {
+            Int32 tmp = GET_LL(j);
+            SET_LL(j, i);
+            i = j;
+            j = tmp;
+         }
+            while (i != s->origPtr);
+
+         s->tPos = s->origPtr;
+         s->nblock_used = 0;
+         if (s->blockRandomised) {
+            BZ_RAND_INIT_MASK;
+            BZ_GET_SMALL(s->k0); s->nblock_used++;
+            BZ_RAND_UPD_MASK; s->k0 ^= BZ_RAND_MASK; 
+         } else {
+            BZ_GET_SMALL(s->k0); s->nblock_used++;
+         }
+
+      } else {
+
+         /*-- compute the T^(-1) vector --*/
+         for (i = 0; i < nblock; i++) {
+            uc = (UChar)(s->tt[i] & 0xff);
+            s->tt[s->cftab[uc]] |= (i << 8);
+            s->cftab[uc]++;
+         }
+
+         s->tPos = s->tt[s->origPtr] >> 8;
+         s->nblock_used = 0;
+         if (s->blockRandomised) {
+            BZ_RAND_INIT_MASK;
+            BZ_GET_FAST(s->k0); s->nblock_used++;
+            BZ_RAND_UPD_MASK; s->k0 ^= BZ_RAND_MASK; 
+         } else {
+            BZ_GET_FAST(s->k0); s->nblock_used++;
+         }
+
+      }
+
+      RETURN(BZ_OK);
+
+
+
+    endhdr_2:
+
+      GET_UCHAR(BZ_X_ENDHDR_2, uc);
+      if (uc != 0x72) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_ENDHDR_3, uc);
+      if (uc != 0x45) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_ENDHDR_4, uc);
+      if (uc != 0x38) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_ENDHDR_5, uc);
+      if (uc != 0x50) RETURN(BZ_DATA_ERROR);
+      GET_UCHAR(BZ_X_ENDHDR_6, uc);
+      if (uc != 0x90) RETURN(BZ_DATA_ERROR);
+
+      s->storedCombinedCRC = 0;
+      GET_UCHAR(BZ_X_CCRC_1, uc);
+      s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
+      GET_UCHAR(BZ_X_CCRC_2, uc);
+      s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
+      GET_UCHAR(BZ_X_CCRC_3, uc);
+      s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
+      GET_UCHAR(BZ_X_CCRC_4, uc);
+      s->storedCombinedCRC = (s->storedCombinedCRC << 8) | ((UInt32)uc);
+
+      s->state = BZ_X_IDLE;
+      RETURN(BZ_STREAM_END);
+
+      default: AssertH ( False, 4001 );
+   }
+
+   AssertH ( False, 4002 );
+
+   save_state_and_return:
+
+   s->save_i           = i;
+   s->save_j           = j;
+   s->save_t           = t;
+   s->save_alphaSize   = alphaSize;
+   s->save_nGroups     = nGroups;
+   s->save_nSelectors  = nSelectors;
+   s->save_EOB         = EOB;
+   s->save_groupNo     = groupNo;
+   s->save_groupPos    = groupPos;
+   s->save_nextSym     = nextSym;
+   s->save_nblockMAX   = nblockMAX;
+   s->save_nblock      = nblock;
+   s->save_es          = es;
+   s->save_N           = N;
+   s->save_curr        = curr;
+   s->save_zt          = zt;
+   s->save_zn          = zn;
+   s->save_zvec        = zvec;
+   s->save_zj          = zj;
+   s->save_gSel        = gSel;
+   s->save_gMinlen     = gMinlen;
+   s->save_gLimit      = gLimit;
+   s->save_gBase       = gBase;
+   s->save_gPerm       = gPerm;
+
+   return retVal;   
+}
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                      decompress.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/winsup/bz2lib/dlltest.c b/winsup/bz2lib/dlltest.c
new file mode 100644
index 000000000..f79279cef
--- /dev/null
+++ b/winsup/bz2lib/dlltest.c
@@ -0,0 +1,176 @@
+/*

+   minibz2

+      libbz2.dll test program.

+      by Yoshioka Tsuneo(QWF00133@nifty.ne.jp/tsuneo-y@is.aist-nara.ac.jp)

+      This file is Public Domain.

+      welcome any email to me.

+

+   usage: minibz2 [-d] [-{1,2,..9}] [[srcfilename] destfilename]

+*/

+

+#define BZ_IMPORT

+#include <stdio.h>

+#include <stdlib.h>

+#include "bzlib.h"

+#ifdef _WIN32

+#include <io.h>

+#endif

+

+

+#ifdef _WIN32

+

+#define BZ2_LIBNAME "libbz2-1.0.0.DLL" 

+

+#include <windows.h>

+static int BZ2DLLLoaded = 0;

+static HINSTANCE BZ2DLLhLib;

+int BZ2DLLLoadLibrary(void)

+{

+   HINSTANCE hLib;

+

+   if(BZ2DLLLoaded==1){return 0;}

+   hLib=LoadLibrary(BZ2_LIBNAME);

+   if(hLib == NULL){

+      fprintf(stderr,"Can't load %s\n",BZ2_LIBNAME);

+      return -1;

+   }

+   BZ2_bzlibVersion=GetProcAddress(hLib,"BZ2_bzlibVersion");

+   BZ2_bzopen=GetProcAddress(hLib,"BZ2_bzopen");

+   BZ2_bzdopen=GetProcAddress(hLib,"BZ2_bzdopen");

+   BZ2_bzread=GetProcAddress(hLib,"BZ2_bzread");

+   BZ2_bzwrite=GetProcAddress(hLib,"BZ2_bzwrite");

+   BZ2_bzflush=GetProcAddress(hLib,"BZ2_bzflush");

+   BZ2_bzclose=GetProcAddress(hLib,"BZ2_bzclose");

+   BZ2_bzerror=GetProcAddress(hLib,"BZ2_bzerror");

+

+   if (!BZ2_bzlibVersion || !BZ2_bzopen || !BZ2_bzdopen

+       || !BZ2_bzread || !BZ2_bzwrite || !BZ2_bzflush

+       || !BZ2_bzclose || !BZ2_bzerror) {

+      fprintf(stderr,"GetProcAddress failed.\n");

+      return -1;

+   }

+   BZ2DLLLoaded=1;

+   BZ2DLLhLib=hLib;

+   return 0;

+

+}

+int BZ2DLLFreeLibrary(void)

+{

+   if(BZ2DLLLoaded==0){return 0;}

+   FreeLibrary(BZ2DLLhLib);

+   BZ2DLLLoaded=0;

+}

+#endif /* WIN32 */

+

+void usage(void)

+{

+   puts("usage: minibz2 [-d] [-{1,2,..9}] [[srcfilename] destfilename]");

+}

+

+int main(int argc,char *argv[])

+{

+   int decompress = 0;

+   int level = 9;

+   char *fn_r = NULL;

+   char *fn_w = NULL;

+

+#ifdef _WIN32

+   if(BZ2DLLLoadLibrary()<0){

+      fprintf(stderr,"Loading of %s failed.  Giving up.\n", BZ2_LIBNAME);

+      exit(1);

+   }

+   printf("Loading of %s succeeded.  Library version is %s.\n",

+          BZ2_LIBNAME, BZ2_bzlibVersion() );

+#endif

+   while(++argv,--argc){

+      if(**argv =='-' || **argv=='/'){

+         char *p;

+

+         for(p=*argv+1;*p;p++){

+            if(*p=='d'){

+               decompress = 1;

+            }else if('1'<=*p && *p<='9'){

+               level = *p - '0';

+            }else{

+               usage();

+               exit(1);

+            }

+         }

+      }else{

+         break;

+      }

+   }

+   if(argc>=1){

+      fn_r = *argv;

+      argc--;argv++;

+   }else{

+      fn_r = NULL;

+   }

+   if(argc>=1){

+      fn_w = *argv;

+      argc--;argv++;

+   }else{

+      fn_w = NULL;

+   }

+   {

+      int len;

+      char buff[0x1000];

+      char mode[10];

+

+      if(decompress){

+         BZFILE *BZ2fp_r = NULL;

+         FILE *fp_w = NULL;

+

+         if(fn_w){

+            if((fp_w = fopen(fn_w,"wb"))==NULL){

+               printf("can't open [%s]\n",fn_w);

+               perror("reason:");

+               exit(1);

+            }

+         }else{

+            fp_w = stdout;

+         }

+         if((BZ2fp_r == NULL && (BZ2fp_r = BZ2_bzdopen(fileno(stdin),"rb"))==NULL)

+            || (BZ2fp_r != NULL && (BZ2fp_r = BZ2_bzopen(fn_r,"rb"))==NULL)){

+            printf("can't bz2openstream\n");

+            exit(1);

+         }

+         while((len=BZ2_bzread(BZ2fp_r,buff,0x1000))>0){

+            fwrite(buff,1,len,fp_w);

+         }

+         BZ2_bzclose(BZ2fp_r);

+         if(fp_w != stdout) fclose(fp_w);

+      }else{

+         BZFILE *BZ2fp_w = NULL;

+         FILE *fp_r = NULL;

+

+         if(fn_r){

+            if((fp_r = fopen(fn_r,"rb"))==NULL){

+               printf("can't open [%s]\n",fn_r);

+               perror("reason:");

+               exit(1);

+            }

+         }else{

+            fp_r = stdin;

+         }

+         mode[0]='w';

+         mode[1] = '0' + level;

+         mode[2] = '\0';

+

+         if((fn_w == NULL && (BZ2fp_w = BZ2_bzdopen(fileno(stdout),mode))==NULL)

+            || (fn_w !=NULL && (BZ2fp_w = BZ2_bzopen(fn_w,mode))==NULL)){

+            printf("can't bz2openstream\n");

+            exit(1);

+         }

+         while((len=fread(buff,1,0x1000,fp_r))>0){

+            BZ2_bzwrite(BZ2fp_w,buff,len);

+         }

+         BZ2_bzclose(BZ2fp_w);

+         if(fp_r!=stdin)fclose(fp_r);

+      }

+   }

+#ifdef _WIN32

+   BZ2DLLFreeLibrary();

+#endif

+   return 0;

+}

diff --git a/winsup/bz2lib/dlltest.dsp b/winsup/bz2lib/dlltest.dsp
new file mode 100644
index 000000000..4b1615edc
--- /dev/null
+++ b/winsup/bz2lib/dlltest.dsp
@@ -0,0 +1,93 @@
+# Microsoft Developer Studio Project File - Name="dlltest" - Package Owner=<4>

+# Microsoft Developer Studio Generated Build File, Format Version 5.00

+# ** �ҏW���Ȃ��ł������� **

+

+# TARGTYPE "Win32 (x86) Console Application" 0x0103

+

+CFG=dlltest - Win32 Debug

+!MESSAGE ����͗L����Ҳ�̧�قł͂���܂���B ������ۼު�Ă�����ނ��邽�߂ɂ� NMAKE ���g�p���Ă��������B

+!MESSAGE [Ҳ�̧�ق̴���߰�] ����ނ��g�p���Ď��s���Ă�������

+!MESSAGE 

+!MESSAGE NMAKE /f "dlltest.mak".

+!MESSAGE 

+!MESSAGE NMAKE �̎��s���ɍ\�����w��ł��܂�

+!MESSAGE ����� ײݏ��ϸۂ̐ݒ���`���܂��B��:

+!MESSAGE 

+!MESSAGE NMAKE /f "dlltest.mak" CFG="dlltest - Win32 Debug"

+!MESSAGE 

+!MESSAGE �I���”\������� Ӱ��:

+!MESSAGE 

+!MESSAGE "dlltest - Win32 Release" ("Win32 (x86) Console Application" �p)

+!MESSAGE "dlltest - Win32 Debug" ("Win32 (x86) Console Application" �p)

+!MESSAGE 

+

+# Begin Project

+# PROP Scc_ProjName ""

+# PROP Scc_LocalPath ""

+CPP=cl.exe

+RSC=rc.exe

+

+!IF  "$(CFG)" == "dlltest - Win32 Release"

+

+# PROP BASE Use_MFC 0

+# PROP BASE Use_Debug_Libraries 0

+# PROP BASE Output_Dir "Release"

+# PROP BASE Intermediate_Dir "Release"

+# PROP BASE Target_Dir ""

+# PROP Use_MFC 0

+# PROP Use_Debug_Libraries 0

+# PROP Output_Dir "Release"

+# PROP Intermediate_Dir "Release"

+# PROP Ignore_Export_Lib 0

+# PROP Target_Dir ""

+# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c

+# ADD CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c

+# ADD BASE RSC /l 0x411 /d "NDEBUG"

+# ADD RSC /l 0x411 /d "NDEBUG"

+BSC32=bscmake.exe

+# ADD BASE BSC32 /nologo

+# ADD BSC32 /nologo

+LINK32=link.exe

+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386

+# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386 /out:"minibz2.exe"

+

+!ELSEIF  "$(CFG)" == "dlltest - Win32 Debug"

+

+# PROP BASE Use_MFC 0

+# PROP BASE Use_Debug_Libraries 1

+# PROP BASE Output_Dir "dlltest_"

+# PROP BASE Intermediate_Dir "dlltest_"

+# PROP BASE Target_Dir ""

+# PROP Use_MFC 0

+# PROP Use_Debug_Libraries 1

+# PROP Output_Dir "dlltest_"

+# PROP Intermediate_Dir "dlltest_"

+# PROP Ignore_Export_Lib 0

+# PROP Target_Dir ""

+# ADD BASE CPP /nologo /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c

+# ADD CPP /nologo /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /c

+# ADD BASE RSC /l 0x411 /d "_DEBUG"

+# ADD RSC /l 0x411 /d "_DEBUG"

+BSC32=bscmake.exe

+# ADD BASE BSC32 /nologo

+# ADD BSC32 /nologo

+LINK32=link.exe

+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept

+# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /out:"minibz2.exe" /pdbtype:sept

+

+!ENDIF 

+

+# Begin Target

+

+# Name "dlltest - Win32 Release"

+# Name "dlltest - Win32 Debug"

+# Begin Source File

+

+SOURCE=.\bzlib.h

+# End Source File

+# Begin Source File

+

+SOURCE=.\dlltest.c

+# End Source File

+# End Target

+# End Project

diff --git a/winsup/bz2lib/huffman.c b/winsup/bz2lib/huffman.c
new file mode 100644
index 000000000..9b446c4b3
--- /dev/null
+++ b/winsup/bz2lib/huffman.c
@@ -0,0 +1,228 @@
+
+/*-------------------------------------------------------------*/
+/*--- Huffman coding low-level stuff                        ---*/
+/*---                                             huffman.c ---*/
+/*-------------------------------------------------------------*/
+
+/*--
+  This file is a part of bzip2 and/or libbzip2, a program and
+  library for lossless, block-sorting data compression.
+
+  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+  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. 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.
+
+  3. Altered source versions must be plainly marked as such, and must
+     not be misrepresented as being the original software.
+
+  4. 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.
+
+  Julian Seward, Cambridge, UK.
+  jseward@acm.org
+  bzip2/libbzip2 version 1.0 of 21 March 2000
+
+  This program is based on (at least) the work of:
+     Mike Burrows
+     David Wheeler
+     Peter Fenwick
+     Alistair Moffat
+     Radford Neal
+     Ian H. Witten
+     Robert Sedgewick
+     Jon L. Bentley
+
+  For more information on these sources, see the manual.
+--*/
+
+
+#include "bzlib_private.h"
+
+/*---------------------------------------------------*/
+#define WEIGHTOF(zz0)  ((zz0) & 0xffffff00)
+#define DEPTHOF(zz1)   ((zz1) & 0x000000ff)
+#define MYMAX(zz2,zz3) ((zz2) > (zz3) ? (zz2) : (zz3))
+
+#define ADDWEIGHTS(zw1,zw2)                           \
+   (WEIGHTOF(zw1)+WEIGHTOF(zw2)) |                    \
+   (1 + MYMAX(DEPTHOF(zw1),DEPTHOF(zw2)))
+
+#define UPHEAP(z)                                     \
+{                                                     \
+   Int32 zz, tmp;                                     \
+   zz = z; tmp = heap[zz];                            \
+   while (weight[tmp] < weight[heap[zz >> 1]]) {      \
+      heap[zz] = heap[zz >> 1];                       \
+      zz >>= 1;                                       \
+   }                                                  \
+   heap[zz] = tmp;                                    \
+}
+
+#define DOWNHEAP(z)                                   \
+{                                                     \
+   Int32 zz, yy, tmp;                                 \
+   zz = z; tmp = heap[zz];                            \
+   while (True) {                                     \
+      yy = zz << 1;                                   \
+      if (yy > nHeap) break;                          \
+      if (yy < nHeap &&                               \
+          weight[heap[yy+1]] < weight[heap[yy]])      \
+         yy++;                                        \
+      if (weight[tmp] < weight[heap[yy]]) break;      \
+      heap[zz] = heap[yy];                            \
+      zz = yy;                                        \
+   }                                                  \
+   heap[zz] = tmp;                                    \
+}
+
+
+/*---------------------------------------------------*/
+void BZ2_hbMakeCodeLengths ( UChar *len, 
+                             Int32 *freq,
+                             Int32 alphaSize,
+                             Int32 maxLen )
+{
+   /*--
+      Nodes and heap entries run from 1.  Entry 0
+      for both the heap and nodes is a sentinel.
+   --*/
+   Int32 nNodes, nHeap, n1, n2, i, j, k;
+   Bool  tooLong;
+
+   Int32 heap   [ BZ_MAX_ALPHA_SIZE + 2 ];
+   Int32 weight [ BZ_MAX_ALPHA_SIZE * 2 ];
+   Int32 parent [ BZ_MAX_ALPHA_SIZE * 2 ]; 
+
+   for (i = 0; i < alphaSize; i++)
+      weight[i+1] = (freq[i] == 0 ? 1 : freq[i]) << 8;
+
+   while (True) {
+
+      nNodes = alphaSize;
+      nHeap = 0;
+
+      heap[0] = 0;
+      weight[0] = 0;
+      parent[0] = -2;
+
+      for (i = 1; i <= alphaSize; i++) {
+         parent[i] = -1;
+         nHeap++;
+         heap[nHeap] = i;
+         UPHEAP(nHeap);
+      }
+
+      AssertH( nHeap < (BZ_MAX_ALPHA_SIZE+2), 2001 );
+   
+      while (nHeap > 1) {
+         n1 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1);
+         n2 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1);
+         nNodes++;
+         parent[n1] = parent[n2] = nNodes;
+         weight[nNodes] = ADDWEIGHTS(weight[n1], weight[n2]);
+         parent[nNodes] = -1;
+         nHeap++;
+         heap[nHeap] = nNodes;
+         UPHEAP(nHeap);
+      }
+
+      AssertH( nNodes < (BZ_MAX_ALPHA_SIZE * 2), 2002 );
+
+      tooLong = False;
+      for (i = 1; i <= alphaSize; i++) {
+         j = 0;
+         k = i;
+         while (parent[k] >= 0) { k = parent[k]; j++; }
+         len[i-1] = j;
+         if (j > maxLen) tooLong = True;
+      }
+      
+      if (! tooLong) break;
+
+      for (i = 1; i < alphaSize; i++) {
+         j = weight[i] >> 8;
+         j = 1 + (j / 2);
+         weight[i] = j << 8;
+      }
+   }
+}
+
+
+/*---------------------------------------------------*/
+void BZ2_hbAssignCodes ( Int32 *code,
+                         UChar *length,
+                         Int32 minLen,
+                         Int32 maxLen,
+                         Int32 alphaSize )
+{
+   Int32 n, vec, i;
+
+   vec = 0;
+   for (n = minLen; n <= maxLen; n++) {
+      for (i = 0; i < alphaSize; i++)
+         if (length[i] == n) { code[i] = vec; vec++; };
+      vec <<= 1;
+   }
+}
+
+
+/*---------------------------------------------------*/
+void BZ2_hbCreateDecodeTables ( Int32 *limit,
+                                Int32 *base,
+                                Int32 *perm,
+                                UChar *length,
+                                Int32 minLen,
+                                Int32 maxLen,
+                                Int32 alphaSize )
+{
+   Int32 pp, i, j, vec;
+
+   pp = 0;
+   for (i = minLen; i <= maxLen; i++)
+      for (j = 0; j < alphaSize; j++)
+         if (length[j] == i) { perm[pp] = j; pp++; };
+
+   for (i = 0; i < BZ_MAX_CODE_LEN; i++) base[i] = 0;
+   for (i = 0; i < alphaSize; i++) base[length[i]+1]++;
+
+   for (i = 1; i < BZ_MAX_CODE_LEN; i++) base[i] += base[i-1];
+
+   for (i = 0; i < BZ_MAX_CODE_LEN; i++) limit[i] = 0;
+   vec = 0;
+
+   for (i = minLen; i <= maxLen; i++) {
+      vec += (base[i+1] - base[i]);
+      limit[i] = vec-1;
+      vec <<= 1;
+   }
+   for (i = minLen + 1; i <= maxLen; i++)
+      base[i] = ((limit[i-1] + 1) << 1) - base[i];
+}
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                         huffman.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/winsup/bz2lib/libbz2.def b/winsup/bz2lib/libbz2.def
new file mode 100644
index 000000000..2dc0dd891
--- /dev/null
+++ b/winsup/bz2lib/libbz2.def
@@ -0,0 +1,27 @@
+LIBRARY			LIBBZ2

+DESCRIPTION		"libbzip2: library for data compression"

+EXPORTS

+	BZ2_bzCompressInit

+	BZ2_bzCompress

+	BZ2_bzCompressEnd

+	BZ2_bzDecompressInit

+	BZ2_bzDecompress

+	BZ2_bzDecompressEnd

+	BZ2_bzReadOpen

+	BZ2_bzReadClose

+	BZ2_bzReadGetUnused

+	BZ2_bzRead

+	BZ2_bzWriteOpen

+	BZ2_bzWrite

+	BZ2_bzWriteClose

+	BZ2_bzWriteClose64

+	BZ2_bzBuffToBuffCompress

+	BZ2_bzBuffToBuffDecompress

+	BZ2_bzlibVersion

+	BZ2_bzopen

+	BZ2_bzdopen

+	BZ2_bzread

+	BZ2_bzwrite

+	BZ2_bzflush

+	BZ2_bzclose

+	BZ2_bzerror

diff --git a/winsup/bz2lib/libbz2.dsp b/winsup/bz2lib/libbz2.dsp
new file mode 100644
index 000000000..a21a20f75
--- /dev/null
+++ b/winsup/bz2lib/libbz2.dsp
@@ -0,0 +1,130 @@
+# Microsoft Developer Studio Project File - Name="libbz2" - Package Owner=<4>

+# Microsoft Developer Studio Generated Build File, Format Version 5.00

+# ** �ҏW���Ȃ��ł������� **

+

+# TARGTYPE "Win32 (x86) Dynamic-Link Library" 0x0102

+

+CFG=libbz2 - Win32 Debug

+!MESSAGE ����͗L����Ҳ�̧�قł͂���܂���B ������ۼު�Ă�����ނ��邽�߂ɂ� NMAKE ���g�p���Ă��������B

+!MESSAGE [Ҳ�̧�ق̴���߰�] ����ނ��g�p���Ď��s���Ă�������

+!MESSAGE 

+!MESSAGE NMAKE /f "libbz2.mak".

+!MESSAGE 

+!MESSAGE NMAKE �̎��s���ɍ\�����w��ł��܂�

+!MESSAGE ����� ײݏ��ϸۂ̐ݒ���`���܂��B��:

+!MESSAGE 

+!MESSAGE NMAKE /f "libbz2.mak" CFG="libbz2 - Win32 Debug"

+!MESSAGE 

+!MESSAGE �I���”\������� Ӱ��:

+!MESSAGE 

+!MESSAGE "libbz2 - Win32 Release" ("Win32 (x86) Dynamic-Link Library" �p)

+!MESSAGE "libbz2 - Win32 Debug" ("Win32 (x86) Dynamic-Link Library" �p)

+!MESSAGE 

+

+# Begin Project

+# PROP Scc_ProjName ""

+# PROP Scc_LocalPath ""

+CPP=cl.exe

+MTL=midl.exe

+RSC=rc.exe

+

+!IF  "$(CFG)" == "libbz2 - Win32 Release"

+

+# PROP BASE Use_MFC 0

+# PROP BASE Use_Debug_Libraries 0

+# PROP BASE Output_Dir "Release"

+# PROP BASE Intermediate_Dir "Release"

+# PROP BASE Target_Dir ""

+# PROP Use_MFC 0

+# PROP Use_Debug_Libraries 0

+# PROP Output_Dir "Release"

+# PROP Intermediate_Dir "Release"

+# PROP Ignore_Export_Lib 0

+# PROP Target_Dir ""

+# ADD BASE CPP /nologo /MT /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /YX /FD /c

+# ADD CPP /nologo /MT /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /YX /FD /c

+# ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /o NUL /win32

+# ADD MTL /nologo /D "NDEBUG" /mktyplib203 /o NUL /win32

+# ADD BASE RSC /l 0x411 /d "NDEBUG"

+# ADD RSC /l 0x411 /d "NDEBUG"

+BSC32=bscmake.exe

+# ADD BASE BSC32 /nologo

+# ADD BSC32 /nologo

+LINK32=link.exe

+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /machine:I386

+# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /machine:I386 /out:"libbz2.dll"

+

+!ELSEIF  "$(CFG)" == "libbz2 - Win32 Debug"

+

+# PROP BASE Use_MFC 0

+# PROP BASE Use_Debug_Libraries 1

+# PROP BASE Output_Dir "Debug"

+# PROP BASE Intermediate_Dir "Debug"

+# PROP BASE Target_Dir ""

+# PROP Use_MFC 0

+# PROP Use_Debug_Libraries 1

+# PROP Output_Dir "Debug"

+# PROP Intermediate_Dir "Debug"

+# PROP Ignore_Export_Lib 0

+# PROP Target_Dir ""

+# ADD BASE CPP /nologo /MTd /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /YX /FD /c

+# ADD CPP /nologo /MTd /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /YX /FD /c

+# ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /o NUL /win32

+# ADD MTL /nologo /D "_DEBUG" /mktyplib203 /o NUL /win32

+# ADD BASE RSC /l 0x411 /d "_DEBUG"

+# ADD RSC /l 0x411 /d "_DEBUG"

+BSC32=bscmake.exe

+# ADD BASE BSC32 /nologo

+# ADD BSC32 /nologo

+LINK32=link.exe

+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /debug /machine:I386 /pdbtype:sept

+# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /debug /machine:I386 /out:"libbz2.dll" /pdbtype:sept

+

+!ENDIF 

+

+# Begin Target

+

+# Name "libbz2 - Win32 Release"

+# Name "libbz2 - Win32 Debug"

+# Begin Source File

+

+SOURCE=.\blocksort.c

+# End Source File

+# Begin Source File

+

+SOURCE=.\bzlib.c

+# End Source File

+# Begin Source File

+

+SOURCE=.\bzlib.h

+# End Source File

+# Begin Source File

+

+SOURCE=.\bzlib_private.h

+# End Source File

+# Begin Source File

+

+SOURCE=.\compress.c

+# End Source File

+# Begin Source File

+

+SOURCE=.\crctable.c

+# End Source File

+# Begin Source File

+

+SOURCE=.\decompress.c

+# End Source File

+# Begin Source File

+

+SOURCE=.\huffman.c

+# End Source File

+# Begin Source File

+

+SOURCE=.\libbz2.def

+# End Source File

+# Begin Source File

+

+SOURCE=.\randtable.c

+# End Source File

+# End Target

+# End Project

diff --git a/winsup/bz2lib/makefile.msc b/winsup/bz2lib/makefile.msc
new file mode 100644
index 000000000..3fe42324a
--- /dev/null
+++ b/winsup/bz2lib/makefile.msc
@@ -0,0 +1,63 @@
+# Makefile for Microsoft Visual C++ 6.0

+# usage: nmake -f makefile.msc

+# K.M. Syring (syring@gsf.de)

+# Fixed up by JRS for bzip2-0.9.5d release.

+

+CC=cl

+CFLAGS= -DWIN32 -MD -Ox -D_FILE_OFFSET_BITS=64

+

+OBJS= blocksort.obj  \

+      huffman.obj    \

+      crctable.obj   \

+      randtable.obj  \

+      compress.obj   \

+      decompress.obj \

+      bzlib.obj

+

+all: lib bzip2 test

+

+bzip2: lib

+	$(CC) $(CFLAGS) -o bzip2 bzip2.c libbz2.lib setargv.obj

+	$(CC) $(CFLAGS) -o bzip2recover bzip2recover.c

+

+lib: $(OBJS)

+	lib /out:libbz2.lib $(OBJS)

+

+test: bzip2

+	type words1

+	.\\bzip2 -1  < sample1.ref > sample1.rb2

+	.\\bzip2 -2  < sample2.ref > sample2.rb2

+	.\\bzip2 -3  < sample3.ref > sample3.rb2

+	.\\bzip2 -d  < sample1.bz2 > sample1.tst

+	.\\bzip2 -d  < sample2.bz2 > sample2.tst

+	.\\bzip2 -ds < sample3.bz2 > sample3.tst

+	@echo All six of the fc's should find no differences.

+	@echo If fc finds an error on sample3.bz2, this could be

+	@echo because WinZip's 'TAR file smart CR/LF conversion'

+	@echo is too clever for its own good.  Disable this option.

+	@echo The correct size for sample3.ref is 120,244.  If it

+	@echo is 150,251, WinZip has messed it up.

+	fc sample1.bz2 sample1.rb2 

+	fc sample2.bz2 sample2.rb2

+	fc sample3.bz2 sample3.rb2

+	fc sample1.tst sample1.ref

+	fc sample2.tst sample2.ref

+	fc sample3.tst sample3.ref

+

+

+

+clean: 

+	del *.obj

+	del libbz2.lib 

+	del bzip2.exe

+	del bzip2recover.exe

+	del sample1.rb2 

+	del sample2.rb2 

+	del sample3.rb2

+	del sample1.tst 

+	del sample2.tst

+	del sample3.tst

+

+.c.obj: 

+	$(CC) $(CFLAGS) -c $*.c -o $*.obj

+

diff --git a/winsup/bz2lib/manual.ps b/winsup/bz2lib/manual.ps
new file mode 100644
index 000000000..1a7dbac85
--- /dev/null
+++ b/winsup/bz2lib/manual.ps
@@ -0,0 +1,3808 @@
+%!PS-Adobe-2.0
+%%Creator: dvips(k) 5.78 Copyright 1998 Radical Eye Software (www.radicaleye.com)
+%%Title: manual.dvi
+%%Pages: 39
+%%PageOrder: Ascend
+%%BoundingBox: 0 0 596 842
+%%EndComments
+%DVIPSCommandLine: dvips -o manual.ps manual.dvi
+%DVIPSParameters: dpi=600, compressed
+%DVIPSSource:  TeX output 2000.03.23:2343
+%%BeginProcSet: texc.pro
+%!
+/TeXDict 300 dict def TeXDict begin /N{def}def /B{bind def}N /S{exch}N
+/X{S N}B /TR{translate}N /isls false N /vsize 11 72 mul N /hsize 8.5 72
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+hsize mul 0}ifelse TR}if Resolution VResolution vsize -72 div 1 add mul
+TR[matrix currentmatrix{dup dup round sub abs 0.00001 lt{round}if}
+forall round exch round exch]setmatrix}N /@landscape{/isls true N}B
+/@manualfeed{statusdict /manualfeed true put}B /@copies{/#copies X}B
+/FMat[1 0 0 -1 0 0]N /FBB[0 0 0 0]N /nn 0 N /IE 0 N /ctr 0 N /df-tail{
+/nn 8 dict N nn begin /FontType 3 N /FontMatrix fntrx N /FontBBox FBB N
+string /base X array /BitMaps X /BuildChar{CharBuilder}N /Encoding IE N
+end dup{/foo setfont}2 array copy cvx N load 0 nn put /ctr 0 N[}B /df{
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+%%Trailer
+end
+userdict /end-hook known{end-hook}if
+%%EOF
diff --git a/winsup/bz2lib/manual.texi b/winsup/bz2lib/manual.texi
new file mode 100644
index 000000000..336776ab8
--- /dev/null
+++ b/winsup/bz2lib/manual.texi
@@ -0,0 +1,2215 @@
+\input texinfo  @c                                  -*- Texinfo -*-
+@setfilename bzip2.info
+
+@ignore
+This file documents bzip2 version 1.0, and associated library
+libbzip2, written by Julian Seward (jseward@acm.org).
+
+Copyright (C) 1996-2000 Julian R Seward
+
+Permission is granted to make and distribute verbatim copies of
+this manual provided the copyright notice and this permission notice
+are preserved on all copies.
+
+Permission is granted to copy and distribute translations of this manual
+into another language, under the above conditions for verbatim copies.
+@end ignore
+
+@ifinfo
+@format
+START-INFO-DIR-ENTRY
+* Bzip2: (bzip2).		A program and library for data compression.
+END-INFO-DIR-ENTRY
+@end format
+
+@end ifinfo
+
+@iftex
+@c @finalout
+@settitle bzip2 and libbzip2
+@titlepage
+@title bzip2 and libbzip2
+@subtitle a program and library for data compression
+@subtitle copyright (C) 1996-2000 Julian Seward
+@subtitle version 1.0 of 21 March 2000
+@author Julian Seward
+
+@end titlepage
+
+@parindent 0mm
+@parskip 2mm
+
+@end iftex
+@node Top, Overview, (dir), (dir)
+
+This program, @code{bzip2}, 
+and associated library @code{libbzip2}, are
+Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+@itemize @bullet
+@item
+   Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+@item
+   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.
+@item
+   Altered source versions must be plainly marked as such, and must
+   not be misrepresented as being the original software.
+@item
+   The name of the author may not be used to endorse or promote 
+   products derived from this software without specific prior written 
+   permission.
+@end itemize
+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.
+
+Julian Seward, Cambridge, UK.
+
+@code{jseward@@acm.org}
+
+@code{http://sourceware.cygnus.com/bzip2}
+
+@code{http://www.cacheprof.org}
+
+@code{http://www.muraroa.demon.co.uk}
+
+@code{bzip2}/@code{libbzip2} version 1.0 of 21 March 2000.
+
+PATENTS: To the best of my knowledge, @code{bzip2} does not use any patented
+algorithms.  However, I do not have the resources available to carry out
+a full patent search.  Therefore I cannot give any guarantee of the
+above statement.
+
+
+
+
+
+
+
+@node Overview, Implementation, Top, Top
+@chapter Introduction
+
+@code{bzip2}  compresses  files  using the Burrows-Wheeler 
+block-sorting text compression algorithm,  and  Huffman  coding.
+Compression  is  generally  considerably  better than that
+achieved by more conventional LZ77/LZ78-based compressors,
+and  approaches  the performance of the PPM family of statistical compressors.
+
+@code{bzip2} is built on top of @code{libbzip2}, a flexible library
+for handling compressed data in the @code{bzip2} format.  This manual
+describes both how to use the program and 
+how to work with the library interface.  Most of the
+manual is devoted to this library, not the program, 
+which is good news if your interest is only in the program.
+
+Chapter 2 describes how to use @code{bzip2}; this is the only part 
+you need to read if you just want to know how to operate the program.
+Chapter 3 describes the programming interfaces in detail, and
+Chapter 4 records some miscellaneous notes which I thought
+ought to be recorded somewhere.
+
+
+@chapter How to use @code{bzip2}
+
+This chapter contains a copy of the @code{bzip2} man page,
+and nothing else.
+
+@quotation
+
+@unnumberedsubsubsec NAME
+@itemize
+@item @code{bzip2}, @code{bunzip2}
+- a block-sorting file compressor, v1.0
+@item @code{bzcat} 
+- decompresses files to stdout
+@item @code{bzip2recover}
+- recovers data from damaged bzip2 files
+@end itemize
+
+@unnumberedsubsubsec SYNOPSIS
+@itemize
+@item @code{bzip2} [ -cdfkqstvzVL123456789 ] [ filenames ...  ]
+@item @code{bunzip2} [ -fkvsVL ] [ filenames ...  ]
+@item @code{bzcat} [ -s ] [ filenames ...  ]
+@item @code{bzip2recover} filename
+@end itemize
+
+@unnumberedsubsubsec DESCRIPTION
+
+@code{bzip2} compresses files using the Burrows-Wheeler block sorting
+text compression algorithm, and Huffman coding.  Compression is
+generally considerably better than that achieved by more conventional
+LZ77/LZ78-based compressors, and approaches the performance of the PPM
+family of statistical compressors.
+
+The command-line options are deliberately very similar to those of GNU
+@code{gzip}, but they are not identical.
+
+@code{bzip2} expects a list of file names to accompany the command-line
+flags.  Each file is replaced by a compressed version of itself, with
+the name @code{original_name.bz2}.  Each compressed file has the same
+modification date, permissions, and, when possible, ownership as the
+corresponding original, so that these properties can be correctly
+restored at decompression time.  File name handling is naive in the
+sense that there is no mechanism for preserving original file names,
+permissions, ownerships or dates in filesystems which lack these
+concepts, or have serious file name length restrictions, such as MS-DOS.
+
+@code{bzip2} and @code{bunzip2} will by default not overwrite existing
+files.  If you want this to happen, specify the @code{-f} flag.
+
+If no file names are specified, @code{bzip2} compresses from standard
+input to standard output.  In this case, @code{bzip2} will decline to
+write compressed output to a terminal, as this would be entirely
+incomprehensible and therefore pointless.
+
+@code{bunzip2} (or @code{bzip2 -d}) decompresses all
+specified files.  Files which were not created by @code{bzip2}
+will be detected and ignored, and a warning issued.  
+@code{bzip2} attempts to guess the filename for the decompressed file 
+from that of the compressed file as follows:
+@itemize
+@item @code{filename.bz2 } becomes @code{filename}
+@item @code{filename.bz  } becomes @code{filename}
+@item @code{filename.tbz2} becomes @code{filename.tar}
+@item @code{filename.tbz } becomes @code{filename.tar}
+@item @code{anyothername } becomes @code{anyothername.out}
+@end itemize
+If the file does not end in one of the recognised endings, 
+@code{.bz2}, @code{.bz}, 
+@code{.tbz2} or @code{.tbz}, @code{bzip2} complains that it cannot
+guess the name of the original file, and uses the original name
+with @code{.out} appended.
+
+As with compression, supplying no
+filenames causes decompression from standard input to standard output.
+
+@code{bunzip2} will correctly decompress a file which is the
+concatenation of two or more compressed files.  The result is the
+concatenation of the corresponding uncompressed files.  Integrity
+testing (@code{-t}) of concatenated compressed files is also supported.
+
+You can also compress or decompress files to the standard output by
+giving the @code{-c} flag.  Multiple files may be compressed and
+decompressed like this.  The resulting outputs are fed sequentially to
+stdout.  Compression of multiple files in this manner generates a stream
+containing multiple compressed file representations.  Such a stream
+can be decompressed correctly only by @code{bzip2} version 0.9.0 or
+later.  Earlier versions of @code{bzip2} will stop after decompressing
+the first file in the stream.
+
+@code{bzcat} (or @code{bzip2 -dc}) decompresses all specified files to
+the standard output.
+
+@code{bzip2} will read arguments from the environment variables
+@code{BZIP2} and @code{BZIP}, in that order, and will process them
+before any arguments read from the command line.  This gives a 
+convenient way to supply default arguments.
+
+Compression is always performed, even if the compressed file is slightly
+larger than the original.  Files of less than about one hundred bytes
+tend to get larger, since the compression mechanism has a constant
+overhead in the region of 50 bytes.  Random data (including the output
+of most file compressors) is coded at about 8.05 bits per byte, giving
+an expansion of around 0.5%.
+
+As a self-check for your protection, @code{bzip2} uses 32-bit CRCs to
+make sure that the decompressed version of a file is identical to the
+original.  This guards against corruption of the compressed data, and
+against undetected bugs in @code{bzip2} (hopefully very unlikely).  The
+chances of data corruption going undetected is microscopic, about one
+chance in four billion for each file processed.  Be aware, though, that
+the check occurs upon decompression, so it can only tell you that
+something is wrong.  It can't help you recover the original uncompressed
+data.  You can use @code{bzip2recover} to try to recover data from
+damaged files.
+
+Return values: 0 for a normal exit, 1 for environmental problems (file
+not found, invalid flags, I/O errors, &c), 2 to indicate a corrupt
+compressed file, 3 for an internal consistency error (eg, bug) which
+caused @code{bzip2} to panic.
+
+
+@unnumberedsubsubsec OPTIONS
+@table @code
+@item -c  --stdout
+Compress or decompress to standard output.
+@item -d  --decompress
+Force decompression.  @code{bzip2}, @code{bunzip2} and @code{bzcat} are
+really the same program, and the decision about what actions to take is
+done on the basis of which name is used.  This flag overrides that
+mechanism, and forces bzip2 to decompress.
+@item -z --compress
+The complement to @code{-d}: forces compression, regardless of the
+invokation name.
+@item -t --test
+Check integrity of the specified file(s), but don't decompress them.
+This really performs a trial decompression and throws away the result.
+@item -f --force
+Force overwrite of output files.  Normally, @code{bzip2} will not overwrite
+existing output files.  Also forces @code{bzip2} to break hard links
+to files, which it otherwise wouldn't do.
+@item -k --keep
+Keep (don't delete) input files during compression
+or decompression.
+@item -s --small
+Reduce memory usage, for compression, decompression and testing.  Files
+are decompressed and tested using a modified algorithm which only
+requires 2.5 bytes per block byte.  This means any file can be
+decompressed in 2300k of memory, albeit at about half the normal speed.
+
+During compression, @code{-s} selects a block size of 200k, which limits
+memory use to around the same figure, at the expense of your compression
+ratio.  In short, if your machine is low on memory (8 megabytes or
+less), use -s for everything.  See MEMORY MANAGEMENT below.
+@item -q --quiet
+Suppress non-essential warning messages.  Messages pertaining to
+I/O errors and other critical events will not be suppressed.
+@item -v --verbose
+Verbose mode -- show the compression ratio for each file processed.
+Further @code{-v}'s increase the verbosity level, spewing out lots of
+information which is primarily of interest for diagnostic purposes.
+@item -L --license -V --version
+Display the software version, license terms and conditions.
+@item -1 to -9
+Set the block size to 100 k, 200 k ..  900 k when compressing.  Has no
+effect when decompressing.  See MEMORY MANAGEMENT below.
+@item --
+Treats all subsequent arguments as file names, even if they start
+with a dash.  This is so you can handle files with names beginning
+with a dash, for example: @code{bzip2 -- -myfilename}.
+@item --repetitive-fast 
+@item --repetitive-best
+These flags are redundant in versions 0.9.5 and above.  They provided
+some coarse control over the behaviour of the sorting algorithm in
+earlier versions, which was sometimes useful.  0.9.5 and above have an
+improved algorithm which renders these flags irrelevant.
+@end table
+
+
+@unnumberedsubsubsec MEMORY MANAGEMENT
+
+@code{bzip2} compresses large files in blocks.  The block size affects
+both the compression ratio achieved, and the amount of memory needed for
+compression and decompression.  The flags @code{-1} through @code{-9}
+specify the block size to be 100,000 bytes through 900,000 bytes (the
+default) respectively.  At decompression time, the block size used for
+compression is read from the header of the compressed file, and
+@code{bunzip2} then allocates itself just enough memory to decompress
+the file.  Since block sizes are stored in compressed files, it follows
+that the flags @code{-1} to @code{-9} are irrelevant to and so ignored
+during decompression.
+
+Compression and decompression requirements, in bytes, can be estimated
+as:
+@example
+     Compression:   400k + ( 8 x block size )
+
+     Decompression: 100k + ( 4 x block size ), or
+                    100k + ( 2.5 x block size )
+@end example
+Larger block sizes give rapidly diminishing marginal returns.  Most of
+the compression comes from the first two or three hundred k of block
+size, a fact worth bearing in mind when using @code{bzip2} on small machines.
+It is also important to appreciate that the decompression memory
+requirement is set at compression time by the choice of block size.
+
+For files compressed with the default 900k block size, @code{bunzip2}
+will require about 3700 kbytes to decompress.  To support decompression
+of any file on a 4 megabyte machine, @code{bunzip2} has an option to
+decompress using approximately half this amount of memory, about 2300
+kbytes.  Decompression speed is also halved, so you should use this
+option only where necessary.  The relevant flag is @code{-s}.
+
+In general, try and use the largest block size memory constraints allow,
+since that maximises the compression achieved.  Compression and
+decompression speed are virtually unaffected by block size.
+
+Another significant point applies to files which fit in a single block
+-- that means most files you'd encounter using a large block size.  The
+amount of real memory touched is proportional to the size of the file,
+since the file is smaller than a block.  For example, compressing a file
+20,000 bytes long with the flag @code{-9} will cause the compressor to
+allocate around 7600k of memory, but only touch 400k + 20000 * 8 = 560
+kbytes of it.  Similarly, the decompressor will allocate 3700k but only
+touch 100k + 20000 * 4 = 180 kbytes.
+
+Here is a table which summarises the maximum memory usage for different
+block sizes.  Also recorded is the total compressed size for 14 files of
+the Calgary Text Compression Corpus totalling 3,141,622 bytes.  This
+column gives some feel for how compression varies with block size.
+These figures tend to understate the advantage of larger block sizes for
+larger files, since the Corpus is dominated by smaller files.
+@example
+          Compress   Decompress   Decompress   Corpus
+   Flag     usage      usage       -s usage     Size
+
+    -1      1200k       500k         350k      914704
+    -2      2000k       900k         600k      877703
+    -3      2800k      1300k         850k      860338
+    -4      3600k      1700k        1100k      846899
+    -5      4400k      2100k        1350k      845160
+    -6      5200k      2500k        1600k      838626
+    -7      6100k      2900k        1850k      834096
+    -8      6800k      3300k        2100k      828642
+    -9      7600k      3700k        2350k      828642
+@end example
+
+@unnumberedsubsubsec RECOVERING DATA FROM DAMAGED FILES
+
+@code{bzip2} compresses files in blocks, usually 900kbytes long.  Each
+block is handled independently.  If a media or transmission error causes
+a multi-block @code{.bz2} file to become damaged, it may be possible to
+recover data from the undamaged blocks in the file.
+
+The compressed representation of each block is delimited by a 48-bit
+pattern, which makes it possible to find the block boundaries with
+reasonable certainty.  Each block also carries its own 32-bit CRC, so
+damaged blocks can be distinguished from undamaged ones.
+
+@code{bzip2recover} is a simple program whose purpose is to search for
+blocks in @code{.bz2} files, and write each block out into its own
+@code{.bz2} file.  You can then use @code{bzip2 -t} to test the
+integrity of the resulting files, and decompress those which are
+undamaged.
+
+@code{bzip2recover} 
+takes a single argument, the name of the damaged file, 
+and writes a number of files @code{rec0001file.bz2},
+       @code{rec0002file.bz2}, etc, containing the  extracted  blocks.
+       The  output  filenames  are  designed  so  that the use of
+       wildcards in subsequent processing -- for example,  
+@code{bzip2 -dc  rec*file.bz2 > recovered_data} -- lists the files in
+       the correct order.
+
+@code{bzip2recover} should be of most use dealing with large @code{.bz2}
+       files,  as  these will contain many blocks.  It is clearly
+       futile to use it on damaged single-block  files,  since  a
+       damaged  block  cannot  be recovered.  If you wish to minimise 
+any potential data loss through media  or  transmission errors, 
+you might consider compressing with a smaller
+       block size.
+
+
+@unnumberedsubsubsec PERFORMANCE NOTES
+
+The sorting phase of compression gathers together similar strings in the
+file.  Because of this, files containing very long runs of repeated
+symbols, like "aabaabaabaab ..."  (repeated several hundred times) may
+compress more slowly than normal.  Versions 0.9.5 and above fare much
+better than previous versions in this respect.  The ratio between
+worst-case and average-case compression time is in the region of 10:1.
+For previous versions, this figure was more like 100:1.  You can use the
+@code{-vvvv} option to monitor progress in great detail, if you want.
+
+Decompression speed is unaffected by these phenomena.
+
+@code{bzip2} usually allocates several megabytes of memory to operate
+in, and then charges all over it in a fairly random fashion.  This means
+that performance, both for compressing and decompressing, is largely
+determined by the speed at which your machine can service cache misses.
+Because of this, small changes to the code to reduce the miss rate have
+been observed to give disproportionately large performance improvements.
+I imagine @code{bzip2} will perform best on machines with very large
+caches.
+
+
+@unnumberedsubsubsec CAVEATS
+
+I/O error messages are not as helpful as they could be.  @code{bzip2}
+tries hard to detect I/O errors and exit cleanly, but the details of
+what the problem is sometimes seem rather misleading.
+
+This manual page pertains to version 1.0 of @code{bzip2}.  Compressed
+data created by this version is entirely forwards and backwards
+compatible with the previous public releases, versions 0.1pl2, 0.9.0 and
+0.9.5, but with the following exception: 0.9.0 and above can correctly
+decompress multiple concatenated compressed files.  0.1pl2 cannot do
+this; it will stop after decompressing just the first file in the
+stream.
+
+@code{bzip2recover} uses 32-bit integers to represent bit positions in
+compressed files, so it cannot handle compressed files more than 512
+megabytes long.  This could easily be fixed.
+
+
+@unnumberedsubsubsec AUTHOR
+Julian Seward, @code{jseward@@acm.org}.
+
+The ideas embodied in @code{bzip2} are due to (at least) the following
+people: Michael Burrows and David Wheeler (for the block sorting
+transformation), David Wheeler (again, for the Huffman coder), Peter
+Fenwick (for the structured coding model in the original @code{bzip},
+and many refinements), and Alistair Moffat, Radford Neal and Ian Witten
+(for the arithmetic coder in the original @code{bzip}).  I am much
+indebted for their help, support and advice.  See the manual in the
+source distribution for pointers to sources of documentation.  Christian
+von Roques encouraged me to look for faster sorting algorithms, so as to
+speed up compression.  Bela Lubkin encouraged me to improve the
+worst-case compression performance.  Many people sent patches, helped
+with portability problems, lent machines, gave advice and were generally
+helpful.
+
+@end quotation
+
+
+
+
+@chapter Programming with @code{libbzip2}
+
+This chapter describes the programming interface to @code{libbzip2}.
+
+For general background information, particularly about memory
+use and performance aspects, you'd be well advised to read Chapter 2
+as well.
+
+@section Top-level structure
+
+@code{libbzip2} is a flexible library for compressing and decompressing
+data in the @code{bzip2} data format.  Although packaged as a single
+entity, it helps to regard the library as three separate parts: the low
+level interface, and the high level interface, and some utility
+functions.
+
+The structure of @code{libbzip2}'s interfaces is similar to
+that of Jean-loup Gailly's and Mark Adler's excellent @code{zlib} 
+library.
+
+All externally visible symbols have names beginning @code{BZ2_}.
+This is new in version 1.0.  The intention is to minimise pollution
+of the namespaces of library clients.
+
+@subsection Low-level summary
+
+This interface provides services for compressing and decompressing
+data in memory.  There's no provision for dealing with files, streams
+or any other I/O mechanisms, just straight memory-to-memory work.
+In fact, this part of the library can be compiled without inclusion
+of @code{stdio.h}, which may be helpful for embedded applications.
+
+The low-level part of the library has no global variables and
+is therefore thread-safe.
+
+Six routines make up the low level interface: 
+@code{BZ2_bzCompressInit}, @code{BZ2_bzCompress}, and @* @code{BZ2_bzCompressEnd}
+for compression,
+and a corresponding trio @code{BZ2_bzDecompressInit}, @* @code{BZ2_bzDecompress}
+and @code{BZ2_bzDecompressEnd} for decompression.  
+The @code{*Init} functions allocate
+memory for compression/decompression and do other
+initialisations, whilst the @code{*End} functions close down operations
+and release memory.
+
+The real work is done by @code{BZ2_bzCompress} and @code{BZ2_bzDecompress}.  
+These compress and decompress data from a user-supplied input buffer
+to a user-supplied output buffer.  These buffers can be any size;
+arbitrary quantities of data are handled by making repeated calls
+to these functions.  This is a flexible mechanism allowing a 
+consumer-pull style of activity, or producer-push, or a mixture of
+both.
+
+
+
+@subsection High-level summary
+
+This interface provides some handy wrappers around the low-level
+interface to facilitate reading and writing @code{bzip2} format
+files (@code{.bz2} files).  The routines provide hooks to facilitate
+reading files in which the @code{bzip2} data stream is embedded 
+within some larger-scale file structure, or where there are
+multiple @code{bzip2} data streams concatenated end-to-end.
+
+For reading files, @code{BZ2_bzReadOpen}, @code{BZ2_bzRead},
+@code{BZ2_bzReadClose} and @* @code{BZ2_bzReadGetUnused} are supplied.  For
+writing files, @code{BZ2_bzWriteOpen}, @code{BZ2_bzWrite} and
+@code{BZ2_bzWriteFinish} are available.
+
+As with the low-level library, no global variables are used
+so the library is per se thread-safe.  However, if I/O errors
+occur whilst reading or writing the underlying compressed files,
+you may have to consult @code{errno} to determine the cause of
+the error.  In that case, you'd need a C library which correctly
+supports @code{errno} in a multithreaded environment.
+
+To make the library a little simpler and more portable,
+@code{BZ2_bzReadOpen} and @code{BZ2_bzWriteOpen} require you to pass them file
+handles (@code{FILE*}s) which have previously been opened for reading or
+writing respectively.  That avoids portability problems associated with
+file operations and file attributes, whilst not being much of an
+imposition on the programmer.
+
+
+
+@subsection Utility functions summary
+For very simple needs, @code{BZ2_bzBuffToBuffCompress} and
+@code{BZ2_bzBuffToBuffDecompress} are provided.  These compress
+data in memory from one buffer to another buffer in a single
+function call.  You should assess whether these functions
+fulfill your memory-to-memory compression/decompression
+requirements before investing effort in understanding the more
+general but more complex low-level interface.
+
+Yoshioka Tsuneo (@code{QWF00133@@niftyserve.or.jp} /
+@code{tsuneo-y@@is.aist-nara.ac.jp}) has contributed some functions to
+give better @code{zlib} compatibility.  These functions are
+@code{BZ2_bzopen}, @code{BZ2_bzread}, @code{BZ2_bzwrite}, @code{BZ2_bzflush},
+@code{BZ2_bzclose},
+@code{BZ2_bzerror} and @code{BZ2_bzlibVersion}.  You may find these functions
+more convenient for simple file reading and writing, than those in the
+high-level interface.  These functions are not (yet) officially part of
+the library, and are minimally documented here.  If they break, you
+get to keep all the pieces.  I hope to document them properly when time
+permits.
+
+Yoshioka also contributed modifications to allow the library to be
+built as a Windows DLL.
+
+
+@section Error handling
+
+The library is designed to recover cleanly in all situations, including
+the worst-case situation of decompressing random data.  I'm not 
+100% sure that it can always do this, so you might want to add
+a signal handler to catch segmentation violations during decompression
+if you are feeling especially paranoid.  I would be interested in
+hearing more about the robustness of the library to corrupted
+compressed data.
+
+Version 1.0 is much more robust in this respect than
+0.9.0 or 0.9.5.  Investigations with Checker (a tool for 
+detecting problems with memory management, similar to Purify)
+indicate that, at least for the few files I tested, all single-bit
+errors in the decompressed data are caught properly, with no
+segmentation faults, no reads of uninitialised data and no 
+out of range reads or writes.  So it's certainly much improved,
+although I wouldn't claim it to be totally bombproof.
+
+The file @code{bzlib.h} contains all definitions needed to use
+the library.  In particular, you should definitely not include
+@code{bzlib_private.h}.
+
+In @code{bzlib.h}, the various return values are defined.  The following
+list is not intended as an exhaustive description of the circumstances 
+in which a given value may be returned -- those descriptions are given
+later.  Rather, it is intended to convey the rough meaning of each
+return value.  The first five actions are normal and not intended to 
+denote an error situation.
+@table @code
+@item BZ_OK
+The requested action was completed successfully.
+@item BZ_RUN_OK
+@itemx BZ_FLUSH_OK
+@itemx BZ_FINISH_OK
+In @code{BZ2_bzCompress}, the requested flush/finish/nothing-special action
+was completed successfully.
+@item BZ_STREAM_END
+Compression of data was completed, or the logical stream end was
+detected during decompression.
+@end table
+
+The following return values indicate an error of some kind.
+@table @code
+@item BZ_CONFIG_ERROR
+Indicates that the library has been improperly compiled on your
+platform -- a major configuration error.  Specifically, it means
+that @code{sizeof(char)}, @code{sizeof(short)} and @code{sizeof(int)}
+are not 1, 2 and 4 respectively, as they should be.  Note that the 
+library should still work properly on 64-bit platforms which follow
+the LP64 programming model -- that is, where @code{sizeof(long)}
+and @code{sizeof(void*)} are 8.  Under LP64, @code{sizeof(int)} is
+still 4, so @code{libbzip2}, which doesn't use the @code{long} type,
+is OK.
+@item BZ_SEQUENCE_ERROR
+When using the library, it is important to call the functions in the
+correct sequence and with data structures (buffers etc) in the correct
+states.  @code{libbzip2} checks as much as it can to ensure this is
+happening, and returns @code{BZ_SEQUENCE_ERROR} if not.  Code which
+complies precisely with the function semantics, as detailed below,
+should never receive this value; such an event denotes buggy code
+which you should investigate.
+@item BZ_PARAM_ERROR
+Returned when a parameter to a function call is out of range 
+or otherwise manifestly incorrect.  As with @code{BZ_SEQUENCE_ERROR},
+this denotes a bug in the client code.  The distinction between
+@code{BZ_PARAM_ERROR} and @code{BZ_SEQUENCE_ERROR} is a bit hazy, but still worth
+making.
+@item BZ_MEM_ERROR
+Returned when a request to allocate memory failed.  Note that the
+quantity of memory needed to decompress a stream cannot be determined
+until the stream's header has been read.  So @code{BZ2_bzDecompress} and
+@code{BZ2_bzRead} may return @code{BZ_MEM_ERROR} even though some of
+the compressed data has been read.  The same is not true for
+compression; once @code{BZ2_bzCompressInit} or @code{BZ2_bzWriteOpen} have
+successfully completed, @code{BZ_MEM_ERROR} cannot occur.
+@item BZ_DATA_ERROR
+Returned when a data integrity error is detected during decompression.
+Most importantly, this means when stored and computed CRCs for the
+data do not match.  This value is also returned upon detection of any
+other anomaly in the compressed data.
+@item BZ_DATA_ERROR_MAGIC
+As a special case of @code{BZ_DATA_ERROR}, it is sometimes useful to
+know when the compressed stream does not start with the correct
+magic bytes (@code{'B' 'Z' 'h'}).  
+@item BZ_IO_ERROR
+Returned by @code{BZ2_bzRead} and @code{BZ2_bzWrite} when there is an error
+reading or writing in the compressed file, and by @code{BZ2_bzReadOpen}
+and @code{BZ2_bzWriteOpen} for attempts to use a file for which the
+error indicator (viz, @code{ferror(f)}) is set.
+On receipt of @code{BZ_IO_ERROR}, the caller should consult
+@code{errno} and/or @code{perror} to acquire operating-system
+specific information about the problem.
+@item BZ_UNEXPECTED_EOF
+Returned by @code{BZ2_bzRead} when the compressed file finishes
+before the logical end of stream is detected.
+@item BZ_OUTBUFF_FULL
+Returned by @code{BZ2_bzBuffToBuffCompress} and
+@code{BZ2_bzBuffToBuffDecompress} to indicate that the output data
+will not fit into the output buffer provided.
+@end table
+
+
+
+@section Low-level interface
+
+@subsection @code{BZ2_bzCompressInit}
+@example
+typedef 
+   struct @{
+      char *next_in;
+      unsigned int avail_in;
+      unsigned int total_in_lo32;
+      unsigned int total_in_hi32;
+
+      char *next_out;
+      unsigned int avail_out;
+      unsigned int total_out_lo32;
+      unsigned int total_out_hi32;
+
+      void *state;
+
+      void *(*bzalloc)(void *,int,int);
+      void (*bzfree)(void *,void *);
+      void *opaque;
+   @} 
+   bz_stream;
+
+int BZ2_bzCompressInit ( bz_stream *strm, 
+                         int blockSize100k, 
+                         int verbosity,
+                         int workFactor );
+
+@end example
+
+Prepares for compression.  The @code{bz_stream} structure
+holds all data pertaining to the compression activity.  
+A @code{bz_stream} structure should be allocated and initialised
+prior to the call.
+The fields of @code{bz_stream}
+comprise the entirety of the user-visible data.  @code{state}
+is a pointer to the private data structures required for compression.
+
+Custom memory allocators are supported, via fields @code{bzalloc}, 
+@code{bzfree},
+and @code{opaque}.  The value 
+@code{opaque} is passed to as the first argument to
+all calls to @code{bzalloc} and @code{bzfree}, but is 
+otherwise ignored by the library.
+The call @code{bzalloc ( opaque, n, m )} is expected to return a 
+pointer @code{p} to
+@code{n * m} bytes of memory, and @code{bzfree ( opaque, p )} 
+should free
+that memory.
+
+If you don't want to use a custom memory allocator, set @code{bzalloc}, 
+@code{bzfree} and
+@code{opaque} to @code{NULL}, 
+and the library will then use the standard @code{malloc}/@code{free}
+routines.
+
+Before calling @code{BZ2_bzCompressInit}, fields @code{bzalloc}, 
+@code{bzfree} and @code{opaque} should
+be filled appropriately, as just described.  Upon return, the internal
+state will have been allocated and initialised, and @code{total_in_lo32}, 
+@code{total_in_hi32}, @code{total_out_lo32} and 
+@code{total_out_hi32} will have been set to zero.  
+These four fields are used by the library
+to inform the caller of the total amount of data passed into and out of
+the library, respectively.  You should not try to change them.
+As of version 1.0, 64-bit counts are maintained, even on 32-bit
+platforms, using the @code{_hi32} fields to store the upper 32 bits
+of the count.  So, for example, the total amount of data in
+is @code{(total_in_hi32 << 32) + total_in_lo32}.
+
+Parameter @code{blockSize100k} specifies the block size to be used for
+compression.  It should be a value between 1 and 9 inclusive, and the
+actual block size used is 100000 x this figure.  9 gives the best
+compression but takes most memory.
+
+Parameter @code{verbosity} should be set to a number between 0 and 4
+inclusive.  0 is silent, and greater numbers give increasingly verbose
+monitoring/debugging output.  If the library has been compiled with
+@code{-DBZ_NO_STDIO}, no such output will appear for any verbosity
+setting.
+
+Parameter @code{workFactor} controls how the compression phase behaves
+when presented with worst case, highly repetitive, input data.  If
+compression runs into difficulties caused by repetitive data, the
+library switches from the standard sorting algorithm to a fallback
+algorithm.  The fallback is slower than the standard algorithm by
+perhaps a factor of three, but always behaves reasonably, no matter how
+bad the input.
+
+Lower values of @code{workFactor} reduce the amount of effort the
+standard algorithm will expend before resorting to the fallback.  You
+should set this parameter carefully; too low, and many inputs will be
+handled by the fallback algorithm and so compress rather slowly, too
+high, and your average-to-worst case compression times can become very
+large.  The default value of 30 gives reasonable behaviour over a wide
+range of circumstances.
+
+Allowable values range from 0 to 250 inclusive.  0 is a special case,
+equivalent to using the default value of 30.
+
+Note that the compressed output generated is the same regardless of
+whether or not the fallback algorithm is used.
+
+Be aware also that this parameter may disappear entirely in future
+versions of the library.  In principle it should be possible to devise a
+good way to automatically choose which algorithm to use.  Such a
+mechanism would render the parameter obsolete.
+
+Possible return values:
+@display
+      @code{BZ_CONFIG_ERROR}
+         if the library has been mis-compiled
+      @code{BZ_PARAM_ERROR} 
+         if @code{strm} is @code{NULL} 
+         or @code{blockSize} < 1 or @code{blockSize} > 9
+         or @code{verbosity} < 0 or @code{verbosity} > 4
+         or @code{workFactor} < 0 or @code{workFactor} > 250
+      @code{BZ_MEM_ERROR} 
+         if not enough memory is available
+      @code{BZ_OK} 
+         otherwise
+@end display
+Allowable next actions:
+@display
+      @code{BZ2_bzCompress} 
+         if @code{BZ_OK} is returned
+      no specific action needed in case of error
+@end display
+
+@subsection @code{BZ2_bzCompress}
+@example
+   int BZ2_bzCompress ( bz_stream *strm, int action );
+@end example
+Provides more input and/or output buffer space for the library.  The
+caller maintains input and output buffers, and calls @code{BZ2_bzCompress} to
+transfer data between them.
+
+Before each call to @code{BZ2_bzCompress}, @code{next_in} should point at
+the data to be compressed, and @code{avail_in} should indicate how many
+bytes the library may read.  @code{BZ2_bzCompress} updates @code{next_in},
+@code{avail_in} and @code{total_in} to reflect the number of bytes it
+has read.
+
+Similarly, @code{next_out} should point to a buffer in which the
+compressed data is to be placed, with @code{avail_out} indicating how
+much output space is available.  @code{BZ2_bzCompress} updates
+@code{next_out}, @code{avail_out} and @code{total_out} to reflect the
+number of bytes output.
+
+You may provide and remove as little or as much data as you like on each
+call of @code{BZ2_bzCompress}.  In the limit, it is acceptable to supply and
+remove data one byte at a time, although this would be terribly
+inefficient.  You should always ensure that at least one byte of output
+space is available at each call.
+
+A second purpose of @code{BZ2_bzCompress} is to request a change of mode of the
+compressed stream.  
+
+Conceptually, a compressed stream can be in one of four states: IDLE,
+RUNNING, FLUSHING and FINISHING.  Before initialisation
+(@code{BZ2_bzCompressInit}) and after termination (@code{BZ2_bzCompressEnd}), a
+stream is regarded as IDLE.
+
+Upon initialisation (@code{BZ2_bzCompressInit}), the stream is placed in the
+RUNNING state.  Subsequent calls to @code{BZ2_bzCompress} should pass
+@code{BZ_RUN} as the requested action; other actions are illegal and
+will result in @code{BZ_SEQUENCE_ERROR}.
+
+At some point, the calling program will have provided all the input data
+it wants to.  It will then want to finish up -- in effect, asking the
+library to process any data it might have buffered internally.  In this
+state, @code{BZ2_bzCompress} will no longer attempt to read data from
+@code{next_in}, but it will want to write data to @code{next_out}.
+Because the output buffer supplied by the user can be arbitrarily small,
+the finishing-up operation cannot necessarily be done with a single call
+of @code{BZ2_bzCompress}.
+
+Instead, the calling program passes @code{BZ_FINISH} as an action to
+@code{BZ2_bzCompress}.  This changes the stream's state to FINISHING.  Any
+remaining input (ie, @code{next_in[0 .. avail_in-1]}) is compressed and
+transferred to the output buffer.  To do this, @code{BZ2_bzCompress} must be
+called repeatedly until all the output has been consumed.  At that
+point, @code{BZ2_bzCompress} returns @code{BZ_STREAM_END}, and the stream's
+state is set back to IDLE.  @code{BZ2_bzCompressEnd} should then be
+called.
+
+Just to make sure the calling program does not cheat, the library makes
+a note of @code{avail_in} at the time of the first call to
+@code{BZ2_bzCompress} which has @code{BZ_FINISH} as an action (ie, at the
+time the program has announced its intention to not supply any more
+input).  By comparing this value with that of @code{avail_in} over
+subsequent calls to @code{BZ2_bzCompress}, the library can detect any
+attempts to slip in more data to compress.  Any calls for which this is
+detected will return @code{BZ_SEQUENCE_ERROR}.  This indicates a
+programming mistake which should be corrected.
+
+Instead of asking to finish, the calling program may ask
+@code{BZ2_bzCompress} to take all the remaining input, compress it and
+terminate the current (Burrows-Wheeler) compression block.  This could
+be useful for error control purposes.  The mechanism is analogous to
+that for finishing: call @code{BZ2_bzCompress} with an action of
+@code{BZ_FLUSH}, remove output data, and persist with the
+@code{BZ_FLUSH} action until the value @code{BZ_RUN} is returned.  As
+with finishing, @code{BZ2_bzCompress} detects any attempt to provide more
+input data once the flush has begun.
+
+Once the flush is complete, the stream returns to the normal RUNNING
+state.
+
+This all sounds pretty complex, but isn't really.  Here's a table
+which shows which actions are allowable in each state, what action
+will be taken, what the next state is, and what the non-error return
+values are.  Note that you can't explicitly ask what state the
+stream is in, but nor do you need to -- it can be inferred from the
+values returned by @code{BZ2_bzCompress}.
+@display
+IDLE/@code{any}           
+      Illegal.  IDLE state only exists after @code{BZ2_bzCompressEnd} or
+      before @code{BZ2_bzCompressInit}.
+      Return value = @code{BZ_SEQUENCE_ERROR}
+
+RUNNING/@code{BZ_RUN}     
+      Compress from @code{next_in} to @code{next_out} as much as possible.
+      Next state = RUNNING
+      Return value = @code{BZ_RUN_OK}
+
+RUNNING/@code{BZ_FLUSH}   
+      Remember current value of @code{next_in}.  Compress from @code{next_in}
+      to @code{next_out} as much as possible, but do not accept any more input.  
+      Next state = FLUSHING
+      Return value = @code{BZ_FLUSH_OK}
+
+RUNNING/@code{BZ_FINISH}  
+      Remember current value of @code{next_in}.  Compress from @code{next_in}
+      to @code{next_out} as much as possible, but do not accept any more input.
+      Next state = FINISHING
+      Return value = @code{BZ_FINISH_OK}
+
+FLUSHING/@code{BZ_FLUSH}  
+      Compress from @code{next_in} to @code{next_out} as much as possible, 
+      but do not accept any more input.  
+      If all the existing input has been used up and all compressed
+      output has been removed
+         Next state = RUNNING; Return value = @code{BZ_RUN_OK}
+      else
+         Next state = FLUSHING; Return value = @code{BZ_FLUSH_OK}
+
+FLUSHING/other     
+      Illegal.
+      Return value = @code{BZ_SEQUENCE_ERROR}
+
+FINISHING/@code{BZ_FINISH}  
+      Compress from @code{next_in} to @code{next_out} as much as possible,
+      but to not accept any more input.  
+      If all the existing input has been used up and all compressed
+      output has been removed
+         Next state = IDLE; Return value = @code{BZ_STREAM_END}
+      else
+         Next state = FINISHING; Return value = @code{BZ_FINISHING}
+
+FINISHING/other
+      Illegal.
+      Return value = @code{BZ_SEQUENCE_ERROR}
+@end display
+
+That still looks complicated?  Well, fair enough.  The usual sequence
+of calls for compressing a load of data is:
+@itemize @bullet
+@item Get started with @code{BZ2_bzCompressInit}.
+@item Shovel data in and shlurp out its compressed form using zero or more
+calls of @code{BZ2_bzCompress} with action = @code{BZ_RUN}.
+@item Finish up.  
+Repeatedly call @code{BZ2_bzCompress} with action = @code{BZ_FINISH}, 
+copying out the compressed output, until @code{BZ_STREAM_END} is returned.
+@item Close up and go home.  Call @code{BZ2_bzCompressEnd}.
+@end itemize
+If the data you want to compress fits into your input buffer all
+at once, you can skip the calls of @code{BZ2_bzCompress ( ..., BZ_RUN )} and 
+just do the @code{BZ2_bzCompress ( ..., BZ_FINISH )} calls.
+
+All required memory is allocated by @code{BZ2_bzCompressInit}.  The
+compression library can accept any data at all (obviously).  So you
+shouldn't get any error return values from the @code{BZ2_bzCompress} calls.
+If you do, they will be @code{BZ_SEQUENCE_ERROR}, and indicate a bug in
+your programming.
+
+Trivial other possible return values:
+@display
+      @code{BZ_PARAM_ERROR}   
+         if @code{strm} is @code{NULL}, or @code{strm->s} is @code{NULL}
+@end display
+
+@subsection @code{BZ2_bzCompressEnd}
+@example
+int BZ2_bzCompressEnd ( bz_stream *strm );
+@end example
+Releases all memory associated with a compression stream.
+
+Possible return values:
+@display
+   @code{BZ_PARAM_ERROR}    if @code{strm} is @code{NULL} or @code{strm->s} is @code{NULL}
+   @code{BZ_OK}    otherwise
+@end display
+
+
+@subsection @code{BZ2_bzDecompressInit}
+@example
+int BZ2_bzDecompressInit ( bz_stream *strm, int verbosity, int small );
+@end example
+Prepares for decompression.  As with @code{BZ2_bzCompressInit}, a
+@code{bz_stream} record should be allocated and initialised before the
+call.  Fields @code{bzalloc}, @code{bzfree} and @code{opaque} should be
+set if a custom memory allocator is required, or made @code{NULL} for
+the normal @code{malloc}/@code{free} routines.  Upon return, the internal
+state will have been initialised, and @code{total_in} and
+@code{total_out} will be zero.
+
+For the meaning of parameter @code{verbosity}, see @code{BZ2_bzCompressInit}.
+
+If @code{small} is nonzero, the library will use an alternative
+decompression algorithm which uses less memory but at the cost of
+decompressing more slowly (roughly speaking, half the speed, but the
+maximum memory requirement drops to around 2300k).  See Chapter 2 for
+more information on memory management.
+
+Note that the amount of memory needed to decompress
+a stream cannot be determined until the stream's header has been read,
+so even if @code{BZ2_bzDecompressInit} succeeds, a subsequent
+@code{BZ2_bzDecompress} could fail with @code{BZ_MEM_ERROR}.
+
+Possible return values:
+@display
+      @code{BZ_CONFIG_ERROR}
+         if the library has been mis-compiled
+      @code{BZ_PARAM_ERROR}
+         if @code{(small != 0 && small != 1)}
+         or @code{(verbosity < 0 || verbosity > 4)}
+      @code{BZ_MEM_ERROR}
+         if insufficient memory is available
+@end display
+
+Allowable next actions:
+@display
+      @code{BZ2_bzDecompress}
+         if @code{BZ_OK} was returned
+      no specific action required in case of error
+@end display
+
+ 
+
+@subsection @code{BZ2_bzDecompress}
+@example
+int BZ2_bzDecompress ( bz_stream *strm );
+@end example
+Provides more input and/out output buffer space for the library.  The
+caller maintains input and output buffers, and uses @code{BZ2_bzDecompress}
+to transfer data between them.
+
+Before each call to @code{BZ2_bzDecompress}, @code{next_in} 
+should point at the compressed data,
+and @code{avail_in} should indicate how many bytes the library
+may read.  @code{BZ2_bzDecompress} updates @code{next_in}, @code{avail_in} 
+and @code{total_in}
+to reflect the number of bytes it has read.
+
+Similarly, @code{next_out} should point to a buffer in which the uncompressed
+output is to be placed, with @code{avail_out} indicating how much output space
+is available.  @code{BZ2_bzCompress} updates @code{next_out},
+@code{avail_out} and @code{total_out} to reflect
+the number of bytes output.
+
+You may provide and remove as little or as much data as you like on
+each call of @code{BZ2_bzDecompress}.  
+In the limit, it is acceptable to
+supply and remove data one byte at a time, although this would be
+terribly inefficient.  You should always ensure that at least one
+byte of output space is available at each call.
+
+Use of @code{BZ2_bzDecompress} is simpler than @code{BZ2_bzCompress}.
+
+You should provide input and remove output as described above, and
+repeatedly call @code{BZ2_bzDecompress} until @code{BZ_STREAM_END} is
+returned.  Appearance of @code{BZ_STREAM_END} denotes that
+@code{BZ2_bzDecompress} has detected the logical end of the compressed
+stream.  @code{BZ2_bzDecompress} will not produce @code{BZ_STREAM_END} until
+all output data has been placed into the output buffer, so once
+@code{BZ_STREAM_END} appears, you are guaranteed to have available all
+the decompressed output, and @code{BZ2_bzDecompressEnd} can safely be
+called.
+
+If case of an error return value, you should call @code{BZ2_bzDecompressEnd}
+to clean up and release memory.
+
+Possible return values:
+@display
+      @code{BZ_PARAM_ERROR}
+         if @code{strm} is @code{NULL} or @code{strm->s} is @code{NULL}
+         or @code{strm->avail_out < 1}
+      @code{BZ_DATA_ERROR}
+         if a data integrity error is detected in the compressed stream
+      @code{BZ_DATA_ERROR_MAGIC}
+         if the compressed stream doesn't begin with the right magic bytes
+      @code{BZ_MEM_ERROR}
+         if there wasn't enough memory available
+      @code{BZ_STREAM_END}
+         if the logical end of the data stream was detected and all
+         output in has been consumed, eg @code{s->avail_out > 0}
+      @code{BZ_OK}
+         otherwise
+@end display
+Allowable next actions:
+@display
+      @code{BZ2_bzDecompress}
+         if @code{BZ_OK} was returned
+      @code{BZ2_bzDecompressEnd}
+         otherwise
+@end display
+
+
+@subsection @code{BZ2_bzDecompressEnd}
+@example
+int BZ2_bzDecompressEnd ( bz_stream *strm );
+@end example
+Releases all memory associated with a decompression stream.
+
+Possible return values:
+@display
+      @code{BZ_PARAM_ERROR}
+         if @code{strm} is @code{NULL} or @code{strm->s} is @code{NULL}
+      @code{BZ_OK}
+         otherwise
+@end display
+
+Allowable next actions:
+@display
+      None.
+@end display
+
+
+@section High-level interface
+
+This interface provides functions for reading and writing 
+@code{bzip2} format files.  First, some general points.
+
+@itemize @bullet
+@item All of the functions take an @code{int*} first argument,
+  @code{bzerror}.
+  After each call, @code{bzerror} should be consulted first to determine
+  the outcome of the call.  If @code{bzerror} is @code{BZ_OK}, 
+  the call completed
+  successfully, and only then should the return value of the function
+  (if any) be consulted.  If @code{bzerror} is @code{BZ_IO_ERROR}, 
+  there was an error
+  reading/writing the underlying compressed file, and you should
+  then consult @code{errno}/@code{perror} to determine the 
+  cause of the difficulty.
+  @code{bzerror} may also be set to various other values; precise details are
+  given on a per-function basis below.
+@item If @code{bzerror} indicates an error 
+  (ie, anything except @code{BZ_OK} and @code{BZ_STREAM_END}),
+  you should immediately call @code{BZ2_bzReadClose} (or @code{BZ2_bzWriteClose},
+  depending on whether you are attempting to read or to write)
+  to free up all resources associated
+  with the stream.  Once an error has been indicated, behaviour of all calls
+  except @code{BZ2_bzReadClose} (@code{BZ2_bzWriteClose}) is undefined.  
+  The implication is that (1) @code{bzerror} should
+  be checked after each call, and (2) if @code{bzerror} indicates an error, 
+  @code{BZ2_bzReadClose} (@code{BZ2_bzWriteClose}) should then be called to clean up.
+@item The @code{FILE*} arguments passed to
+   @code{BZ2_bzReadOpen}/@code{BZ2_bzWriteOpen}  
+  should be set to binary mode.
+  Most Unix systems will do this by default, but other platforms,
+  including Windows and Mac, will not.  If you omit this, you may
+  encounter problems when moving code to new platforms.
+@item Memory allocation requests are handled by
+  @code{malloc}/@code{free}.  
+  At present
+  there is no facility for user-defined memory allocators in the file I/O
+  functions (could easily be added, though).
+@end itemize
+
+
+
+@subsection @code{BZ2_bzReadOpen}
+@example
+   typedef void BZFILE;
+
+   BZFILE *BZ2_bzReadOpen ( int *bzerror, FILE *f, 
+                            int small, int verbosity,
+                            void *unused, int nUnused );
+@end example
+Prepare to read compressed data from file handle @code{f}.  @code{f}
+should refer to a file which has been opened for reading, and for which
+the error indicator (@code{ferror(f)})is not set.  If @code{small} is 1,
+the library will try to decompress using less memory, at the expense of
+speed.
+
+For reasons explained below, @code{BZ2_bzRead} will decompress the
+@code{nUnused} bytes starting at @code{unused}, before starting to read
+from the file @code{f}.  At most @code{BZ_MAX_UNUSED} bytes may be
+supplied like this.  If this facility is not required, you should pass
+@code{NULL} and @code{0} for @code{unused} and n@code{Unused}
+respectively.
+
+For the meaning of parameters @code{small} and @code{verbosity},
+see @code{BZ2_bzDecompressInit}.
+
+The amount of memory needed to decompress a file cannot be determined
+until the file's header has been read.  So it is possible that
+@code{BZ2_bzReadOpen} returns @code{BZ_OK} but a subsequent call of
+@code{BZ2_bzRead} will return @code{BZ_MEM_ERROR}.
+
+Possible assignments to @code{bzerror}:
+@display
+      @code{BZ_CONFIG_ERROR}
+         if the library has been mis-compiled
+      @code{BZ_PARAM_ERROR}
+         if @code{f} is @code{NULL} 
+         or @code{small} is neither @code{0} nor @code{1}                 
+         or @code{(unused == NULL && nUnused != 0)}
+         or @code{(unused != NULL && !(0 <= nUnused <= BZ_MAX_UNUSED))}
+      @code{BZ_IO_ERROR}    
+         if @code{ferror(f)} is nonzero
+      @code{BZ_MEM_ERROR}   
+         if insufficient memory is available
+      @code{BZ_OK}
+         otherwise.
+@end display
+
+Possible return values:
+@display
+      Pointer to an abstract @code{BZFILE}        
+         if @code{bzerror} is @code{BZ_OK}   
+      @code{NULL}
+         otherwise
+@end display
+
+Allowable next actions:
+@display
+      @code{BZ2_bzRead}
+         if @code{bzerror} is @code{BZ_OK}   
+      @code{BZ2_bzClose} 
+         otherwise
+@end display
+
+
+@subsection @code{BZ2_bzRead}
+@example
+   int BZ2_bzRead ( int *bzerror, BZFILE *b, void *buf, int len );
+@end example
+Reads up to @code{len} (uncompressed) bytes from the compressed file 
+@code{b} into
+the buffer @code{buf}.  If the read was successful, 
+@code{bzerror} is set to @code{BZ_OK}
+and the number of bytes read is returned.  If the logical end-of-stream
+was detected, @code{bzerror} will be set to @code{BZ_STREAM_END}, 
+and the number
+of bytes read is returned.  All other @code{bzerror} values denote an error.
+
+@code{BZ2_bzRead} will supply @code{len} bytes,
+unless the logical stream end is detected
+or an error occurs.  Because of this, it is possible to detect the 
+stream end by observing when the number of bytes returned is 
+less than the number
+requested.  Nevertheless, this is regarded as inadvisable; you should
+instead check @code{bzerror} after every call and watch out for
+@code{BZ_STREAM_END}.
+
+Internally, @code{BZ2_bzRead} copies data from the compressed file in chunks
+of size @code{BZ_MAX_UNUSED} bytes
+before decompressing it.  If the file contains more bytes than strictly
+needed to reach the logical end-of-stream, @code{BZ2_bzRead} will almost certainly
+read some of the trailing data before signalling @code{BZ_SEQUENCE_END}.
+To collect the read but unused data once @code{BZ_SEQUENCE_END} has 
+appeared, call @code{BZ2_bzReadGetUnused} immediately before @code{BZ2_bzReadClose}.
+
+Possible assignments to @code{bzerror}:
+@display
+      @code{BZ_PARAM_ERROR}
+         if @code{b} is @code{NULL} or @code{buf} is @code{NULL} or @code{len < 0}
+      @code{BZ_SEQUENCE_ERROR} 
+         if @code{b} was opened with @code{BZ2_bzWriteOpen}
+      @code{BZ_IO_ERROR} 
+         if there is an error reading from the compressed file
+      @code{BZ_UNEXPECTED_EOF} 
+         if the compressed file ended before the logical end-of-stream was detected
+      @code{BZ_DATA_ERROR} 
+         if a data integrity error was detected in the compressed stream
+      @code{BZ_DATA_ERROR_MAGIC}
+         if the stream does not begin with the requisite header bytes (ie, is not 
+         a @code{bzip2} data file).  This is really a special case of @code{BZ_DATA_ERROR}.
+      @code{BZ_MEM_ERROR} 
+         if insufficient memory was available
+      @code{BZ_STREAM_END} 
+         if the logical end of stream was detected.
+      @code{BZ_OK}
+         otherwise.
+@end display
+
+Possible return values:
+@display
+      number of bytes read
+         if @code{bzerror} is @code{BZ_OK} or @code{BZ_STREAM_END}
+      undefined
+         otherwise
+@end display
+
+Allowable next actions:
+@display
+      collect data from @code{buf}, then @code{BZ2_bzRead} or @code{BZ2_bzReadClose}
+         if @code{bzerror} is @code{BZ_OK} 
+      collect data from @code{buf}, then @code{BZ2_bzReadClose} or @code{BZ2_bzReadGetUnused} 
+         if @code{bzerror} is @code{BZ_SEQUENCE_END}   
+      @code{BZ2_bzReadClose} 
+         otherwise
+@end display
+
+
+
+@subsection @code{BZ2_bzReadGetUnused}
+@example
+   void BZ2_bzReadGetUnused ( int* bzerror, BZFILE *b, 
+                              void** unused, int* nUnused );
+@end example
+Returns data which was read from the compressed file but was not needed
+to get to the logical end-of-stream.  @code{*unused} is set to the address
+of the data, and @code{*nUnused} to the number of bytes.  @code{*nUnused} will
+be set to a value between @code{0} and @code{BZ_MAX_UNUSED} inclusive.
+
+This function may only be called once @code{BZ2_bzRead} has signalled 
+@code{BZ_STREAM_END} but before @code{BZ2_bzReadClose}.
+
+Possible assignments to @code{bzerror}:
+@display
+      @code{BZ_PARAM_ERROR} 
+         if @code{b} is @code{NULL} 
+         or @code{unused} is @code{NULL} or @code{nUnused} is @code{NULL}
+      @code{BZ_SEQUENCE_ERROR} 
+         if @code{BZ_STREAM_END} has not been signalled
+         or if @code{b} was opened with @code{BZ2_bzWriteOpen}
+     @code{BZ_OK}
+         otherwise
+@end display
+
+Allowable next actions:
+@display 
+      @code{BZ2_bzReadClose}
+@end display
+
+
+@subsection @code{BZ2_bzReadClose}
+@example
+   void BZ2_bzReadClose ( int *bzerror, BZFILE *b );
+@end example
+Releases all memory pertaining to the compressed file @code{b}.  
+@code{BZ2_bzReadClose} does not call @code{fclose} on the underlying file
+handle, so you should do that yourself if appropriate.
+@code{BZ2_bzReadClose} should be called to clean up after all error
+situations.
+
+Possible assignments to @code{bzerror}:
+@display
+      @code{BZ_SEQUENCE_ERROR} 
+         if @code{b} was opened with @code{BZ2_bzOpenWrite} 
+      @code{BZ_OK} 
+         otherwise
+@end display
+
+Allowable next actions:
+@display
+      none
+@end display
+
+
+
+@subsection @code{BZ2_bzWriteOpen}
+@example
+   BZFILE *BZ2_bzWriteOpen ( int *bzerror, FILE *f, 
+                             int blockSize100k, int verbosity,
+                             int workFactor );
+@end example
+Prepare to write compressed data to file handle @code{f}.  
+@code{f} should refer to
+a file which has been opened for writing, and for which the error
+indicator (@code{ferror(f)})is not set.  
+
+For the meaning of parameters @code{blockSize100k},
+@code{verbosity} and @code{workFactor}, see
+@* @code{BZ2_bzCompressInit}.
+
+All required memory is allocated at this stage, so if the call
+completes successfully, @code{BZ_MEM_ERROR} cannot be signalled by a
+subsequent call to @code{BZ2_bzWrite}.
+
+Possible assignments to @code{bzerror}:
+@display 
+      @code{BZ_CONFIG_ERROR}
+         if the library has been mis-compiled
+      @code{BZ_PARAM_ERROR} 
+         if @code{f} is @code{NULL} 
+         or @code{blockSize100k < 1} or @code{blockSize100k > 9}
+      @code{BZ_IO_ERROR} 
+         if @code{ferror(f)} is nonzero
+      @code{BZ_MEM_ERROR} 
+         if insufficient memory is available
+      @code{BZ_OK} 
+         otherwise
+@end display
+
+Possible return values:
+@display
+      Pointer to an abstract @code{BZFILE}  
+         if @code{bzerror} is @code{BZ_OK}   
+      @code{NULL} 
+         otherwise
+@end display
+
+Allowable next actions:
+@display
+      @code{BZ2_bzWrite} 
+         if @code{bzerror} is @code{BZ_OK} 
+         (you could go directly to @code{BZ2_bzWriteClose}, but this would be pretty pointless)
+      @code{BZ2_bzWriteClose} 
+         otherwise
+@end display
+
+
+
+@subsection @code{BZ2_bzWrite}
+@example
+   void BZ2_bzWrite ( int *bzerror, BZFILE *b, void *buf, int len );
+@end example
+Absorbs @code{len} bytes from the buffer @code{buf}, eventually to be
+compressed and written to the file.
+
+Possible assignments to @code{bzerror}:
+@display
+      @code{BZ_PARAM_ERROR} 
+         if @code{b} is @code{NULL} or @code{buf} is @code{NULL} or @code{len < 0}
+      @code{BZ_SEQUENCE_ERROR} 
+         if b was opened with @code{BZ2_bzReadOpen}
+      @code{BZ_IO_ERROR} 
+         if there is an error writing the compressed file.
+      @code{BZ_OK} 
+         otherwise
+@end display
+
+
+
+
+@subsection @code{BZ2_bzWriteClose}
+@example
+   void BZ2_bzWriteClose ( int *bzerror, BZFILE* f,
+                           int abandon,
+                           unsigned int* nbytes_in,
+                           unsigned int* nbytes_out );
+
+   void BZ2_bzWriteClose64 ( int *bzerror, BZFILE* f,
+                             int abandon,
+                             unsigned int* nbytes_in_lo32,
+                             unsigned int* nbytes_in_hi32,
+                             unsigned int* nbytes_out_lo32,
+                             unsigned int* nbytes_out_hi32 );
+@end example
+
+Compresses and flushes to the compressed file all data so far supplied
+by @code{BZ2_bzWrite}.  The logical end-of-stream markers are also written, so
+subsequent calls to @code{BZ2_bzWrite} are illegal.  All memory associated 
+with the compressed file @code{b} is released.  
+@code{fflush} is called on the
+compressed file, but it is not @code{fclose}'d.
+
+If @code{BZ2_bzWriteClose} is called to clean up after an error, the only
+action is to release the memory.  The library records the error codes
+issued by previous calls, so this situation will be detected
+automatically.  There is no attempt to complete the compression
+operation, nor to @code{fflush} the compressed file.  You can force this
+behaviour to happen even in the case of no error, by passing a nonzero
+value to @code{abandon}.
+
+If @code{nbytes_in} is non-null, @code{*nbytes_in} will be set to be the
+total volume of uncompressed data handled.  Similarly, @code{nbytes_out}
+will be set to the total volume of compressed data written.  For 
+compatibility with older versions of the library, @code{BZ2_bzWriteClose}
+only yields the lower 32 bits of these counts.  Use
+@code{BZ2_bzWriteClose64} if you want the full 64 bit counts.  These
+two functions are otherwise absolutely identical.
+
+
+Possible assignments to @code{bzerror}:
+@display
+      @code{BZ_SEQUENCE_ERROR} 
+         if @code{b} was opened with @code{BZ2_bzReadOpen}
+      @code{BZ_IO_ERROR} 
+         if there is an error writing the compressed file
+      @code{BZ_OK} 
+         otherwise
+@end display
+
+@subsection Handling embedded compressed data streams
+
+The high-level library facilitates use of
+@code{bzip2} data streams which form some part of a surrounding, larger
+data stream.
+@itemize @bullet
+@item For writing, the library takes an open file handle, writes
+compressed data to it, @code{fflush}es it but does not @code{fclose} it.
+The calling application can write its own data before and after the
+compressed data stream, using that same file handle.
+@item Reading is more complex, and the facilities are not as general
+as they could be since generality is hard to reconcile with efficiency.
+@code{BZ2_bzRead} reads from the compressed file in blocks of size
+@code{BZ_MAX_UNUSED} bytes, and in doing so probably will overshoot
+the logical end of compressed stream.
+To recover this data once decompression has
+ended, call @code{BZ2_bzReadGetUnused} after the last call of @code{BZ2_bzRead}
+(the one returning @code{BZ_STREAM_END}) but before calling
+@code{BZ2_bzReadClose}.
+@end itemize
+
+This mechanism makes it easy to decompress multiple @code{bzip2}
+streams placed end-to-end.  As the end of one stream, when @code{BZ2_bzRead}
+returns @code{BZ_STREAM_END}, call @code{BZ2_bzReadGetUnused} to collect the
+unused data (copy it into your own buffer somewhere).  
+That data forms the start of the next compressed stream.
+To start uncompressing that next stream, call @code{BZ2_bzReadOpen} again,
+feeding in the unused data via the @code{unused}/@code{nUnused}
+parameters.
+Keep doing this until @code{BZ_STREAM_END} return coincides with the
+physical end of file (@code{feof(f)}).  In this situation
+@code{BZ2_bzReadGetUnused}
+will of course return no data.
+
+This should give some feel for how the high-level interface can be used.
+If you require extra flexibility, you'll have to bite the bullet and get
+to grips with the low-level interface.
+
+@subsection Standard file-reading/writing code
+Here's how you'd write data to a compressed file:
+@example @code
+FILE*   f;
+BZFILE* b;
+int     nBuf;
+char    buf[ /* whatever size you like */ ];
+int     bzerror;
+int     nWritten;
+
+f = fopen ( "myfile.bz2", "w" );
+if (!f) @{
+   /* handle error */
+@}
+b = BZ2_bzWriteOpen ( &bzerror, f, 9 );
+if (bzerror != BZ_OK) @{
+   BZ2_bzWriteClose ( b );
+   /* handle error */
+@}
+
+while ( /* condition */ ) @{
+   /* get data to write into buf, and set nBuf appropriately */
+   nWritten = BZ2_bzWrite ( &bzerror, b, buf, nBuf );
+   if (bzerror == BZ_IO_ERROR) @{ 
+      BZ2_bzWriteClose ( &bzerror, b );
+      /* handle error */
+   @}
+@}
+
+BZ2_bzWriteClose ( &bzerror, b );
+if (bzerror == BZ_IO_ERROR) @{
+   /* handle error */
+@}
+@end example
+And to read from a compressed file:
+@example
+FILE*   f;
+BZFILE* b;
+int     nBuf;
+char    buf[ /* whatever size you like */ ];
+int     bzerror;
+int     nWritten;
+
+f = fopen ( "myfile.bz2", "r" );
+if (!f) @{
+   /* handle error */
+@}
+b = BZ2_bzReadOpen ( &bzerror, f, 0, NULL, 0 );
+if (bzerror != BZ_OK) @{
+   BZ2_bzReadClose ( &bzerror, b );
+   /* handle error */
+@}
+
+bzerror = BZ_OK;
+while (bzerror == BZ_OK && /* arbitrary other conditions */) @{
+   nBuf = BZ2_bzRead ( &bzerror, b, buf, /* size of buf */ );
+   if (bzerror == BZ_OK) @{
+      /* do something with buf[0 .. nBuf-1] */
+   @}
+@}
+if (bzerror != BZ_STREAM_END) @{
+   BZ2_bzReadClose ( &bzerror, b );
+   /* handle error */
+@} else @{
+   BZ2_bzReadClose ( &bzerror );
+@}
+@end example
+
+
+
+@section Utility functions
+@subsection @code{BZ2_bzBuffToBuffCompress}
+@example
+   int BZ2_bzBuffToBuffCompress( char*         dest,
+                                 unsigned int* destLen,
+                                 char*         source,
+                                 unsigned int  sourceLen,
+                                 int           blockSize100k,
+                                 int           verbosity,
+                                 int           workFactor );
+@end example
+Attempts to compress the data in @code{source[0 .. sourceLen-1]}
+into the destination buffer, @code{dest[0 .. *destLen-1]}.
+If the destination buffer is big enough, @code{*destLen} is
+set to the size of the compressed data, and @code{BZ_OK} is
+returned.  If the compressed data won't fit, @code{*destLen}
+is unchanged, and @code{BZ_OUTBUFF_FULL} is returned.
+
+Compression in this manner is a one-shot event, done with a single call
+to this function.  The resulting compressed data is a complete
+@code{bzip2} format data stream.  There is no mechanism for making
+additional calls to provide extra input data.  If you want that kind of
+mechanism, use the low-level interface.
+
+For the meaning of parameters @code{blockSize100k}, @code{verbosity}
+and @code{workFactor}, @* see @code{BZ2_bzCompressInit}.
+
+To guarantee that the compressed data will fit in its buffer, allocate
+an output buffer of size 1% larger than the uncompressed data, plus
+six hundred extra bytes.
+
+@code{BZ2_bzBuffToBuffDecompress} will not write data at or
+beyond @code{dest[*destLen]}, even in case of buffer overflow.
+
+Possible return values:
+@display
+      @code{BZ_CONFIG_ERROR}
+         if the library has been mis-compiled
+      @code{BZ_PARAM_ERROR} 
+         if @code{dest} is @code{NULL} or @code{destLen} is @code{NULL}
+         or @code{blockSize100k < 1} or @code{blockSize100k > 9}
+         or @code{verbosity < 0} or @code{verbosity > 4} 
+         or @code{workFactor < 0} or @code{workFactor > 250}
+      @code{BZ_MEM_ERROR}
+         if insufficient memory is available 
+      @code{BZ_OUTBUFF_FULL}
+         if the size of the compressed data exceeds @code{*destLen}
+      @code{BZ_OK} 
+         otherwise
+@end display
+
+
+
+@subsection @code{BZ2_bzBuffToBuffDecompress}
+@example
+   int BZ2_bzBuffToBuffDecompress ( char*         dest,
+                                    unsigned int* destLen,
+                                    char*         source,
+                                    unsigned int  sourceLen,
+                                    int           small,
+                                    int           verbosity );
+@end example
+Attempts to decompress the data in @code{source[0 .. sourceLen-1]}
+into the destination buffer, @code{dest[0 .. *destLen-1]}.
+If the destination buffer is big enough, @code{*destLen} is
+set to the size of the uncompressed data, and @code{BZ_OK} is
+returned.  If the compressed data won't fit, @code{*destLen}
+is unchanged, and @code{BZ_OUTBUFF_FULL} is returned.
+
+@code{source} is assumed to hold a complete @code{bzip2} format
+data stream.  @* @code{BZ2_bzBuffToBuffDecompress} tries to decompress
+the entirety of the stream into the output buffer.
+
+For the meaning of parameters @code{small} and @code{verbosity},
+see @code{BZ2_bzDecompressInit}.
+
+Because the compression ratio of the compressed data cannot be known in
+advance, there is no easy way to guarantee that the output buffer will
+be big enough.  You may of course make arrangements in your code to
+record the size of the uncompressed data, but such a mechanism is beyond
+the scope of this library.
+
+@code{BZ2_bzBuffToBuffDecompress} will not write data at or
+beyond @code{dest[*destLen]}, even in case of buffer overflow.
+
+Possible return values:
+@display
+      @code{BZ_CONFIG_ERROR}
+         if the library has been mis-compiled
+      @code{BZ_PARAM_ERROR} 
+         if @code{dest} is @code{NULL} or @code{destLen} is @code{NULL}
+         or @code{small != 0 && small != 1}
+         or @code{verbosity < 0} or @code{verbosity > 4} 
+      @code{BZ_MEM_ERROR}
+         if insufficient memory is available 
+      @code{BZ_OUTBUFF_FULL}
+         if the size of the compressed data exceeds @code{*destLen}
+      @code{BZ_DATA_ERROR}
+         if a data integrity error was detected in the compressed data
+      @code{BZ_DATA_ERROR_MAGIC}
+         if the compressed data doesn't begin with the right magic bytes
+      @code{BZ_UNEXPECTED_EOF}
+         if the compressed data ends unexpectedly
+      @code{BZ_OK} 
+         otherwise
+@end display
+
+
+
+@section @code{zlib} compatibility functions
+Yoshioka Tsuneo has contributed some functions to
+give better @code{zlib} compatibility.  These functions are
+@code{BZ2_bzopen}, @code{BZ2_bzread}, @code{BZ2_bzwrite}, @code{BZ2_bzflush},
+@code{BZ2_bzclose},
+@code{BZ2_bzerror} and @code{BZ2_bzlibVersion}.
+These functions are not (yet) officially part of
+the library.  If they break, you get to keep all the pieces.
+Nevertheless, I think they work ok.
+@example
+typedef void BZFILE;
+
+const char * BZ2_bzlibVersion ( void );
+@end example
+Returns a string indicating the library version.
+@example
+BZFILE * BZ2_bzopen  ( const char *path, const char *mode );
+BZFILE * BZ2_bzdopen ( int        fd,    const char *mode );
+@end example
+Opens a @code{.bz2} file for reading or writing, using either its name
+or a pre-existing file descriptor. 
+Analogous to @code{fopen} and @code{fdopen}.
+@example         
+int BZ2_bzread  ( BZFILE* b, void* buf, int len );
+int BZ2_bzwrite ( BZFILE* b, void* buf, int len );
+@end example
+Reads/writes data from/to a previously opened @code{BZFILE}.
+Analogous to @code{fread} and @code{fwrite}.
+@example
+int  BZ2_bzflush ( BZFILE* b );
+void BZ2_bzclose ( BZFILE* b );
+@end example
+Flushes/closes a @code{BZFILE}.  @code{BZ2_bzflush} doesn't actually do
+anything.  Analogous to @code{fflush} and @code{fclose}.
+
+@example 
+const char * BZ2_bzerror ( BZFILE *b, int *errnum )
+@end example
+Returns a string describing the more recent error status of
+@code{b}, and also sets @code{*errnum} to its numerical value.
+
+
+@section Using the library in a @code{stdio}-free environment
+
+@subsection Getting rid of @code{stdio}
+
+In a deeply embedded application, you might want to use just
+the memory-to-memory functions.  You can do this conveniently
+by compiling the library with preprocessor symbol @code{BZ_NO_STDIO}
+defined.  Doing this gives you a library containing only the following
+eight functions:
+
+@code{BZ2_bzCompressInit}, @code{BZ2_bzCompress}, @code{BZ2_bzCompressEnd} @*
+@code{BZ2_bzDecompressInit}, @code{BZ2_bzDecompress}, @code{BZ2_bzDecompressEnd} @*
+@code{BZ2_bzBuffToBuffCompress}, @code{BZ2_bzBuffToBuffDecompress}
+
+When compiled like this, all functions will ignore @code{verbosity}
+settings.
+
+@subsection Critical error handling
+@code{libbzip2} contains a number of internal assertion checks which
+should, needless to say, never be activated.  Nevertheless, if an
+assertion should fail, behaviour depends on whether or not the library
+was compiled with @code{BZ_NO_STDIO} set.
+
+For a normal compile, an assertion failure yields the message
+@example
+   bzip2/libbzip2: internal error number N.
+   This is a bug in bzip2/libbzip2, 1.0 of 21-Mar-2000.
+   Please report it to me at: jseward@@acm.org.  If this happened
+   when you were using some program which uses libbzip2 as a
+   component, you should also report this bug to the author(s)
+   of that program.  Please make an effort to report this bug;
+   timely and accurate bug reports eventually lead to higher
+   quality software.  Thanks.  Julian Seward, 21 March 2000.
+@end example
+where @code{N} is some error code number.  @code{exit(3)}
+is then called.
+
+For a @code{stdio}-free library, assertion failures result
+in a call to a function declared as:
+@example
+   extern void bz_internal_error ( int errcode );
+@end example
+The relevant code is passed as a parameter.  You should supply
+such a function.
+
+In either case, once an assertion failure has occurred, any 
+@code{bz_stream} records involved can be regarded as invalid.
+You should not attempt to resume normal operation with them.
+
+You may, of course, change critical error handling to suit
+your needs.  As I said above, critical errors indicate bugs
+in the library and should not occur.  All "normal" error
+situations are indicated via error return codes from functions,
+and can be recovered from.
+
+
+@section Making a Windows DLL
+Everything related to Windows has been contributed by Yoshioka Tsuneo
+@* (@code{QWF00133@@niftyserve.or.jp} /
+@code{tsuneo-y@@is.aist-nara.ac.jp}), so you should send your queries to
+him (but perhaps Cc: me, @code{jseward@@acm.org}).
+
+My vague understanding of what to do is: using Visual C++ 5.0,
+open the project file @code{libbz2.dsp}, and build.  That's all.
+
+If you can't
+open the project file for some reason, make a new one, naming these files:
+@code{blocksort.c}, @code{bzlib.c}, @code{compress.c}, 
+@code{crctable.c}, @code{decompress.c}, @code{huffman.c}, @*
+@code{randtable.c} and @code{libbz2.def}.  You will also need
+to name the header files @code{bzlib.h} and @code{bzlib_private.h}.
+
+If you don't use VC++, you may need to define the proprocessor symbol
+@code{_WIN32}. 
+
+Finally, @code{dlltest.c} is a sample program using the DLL.  It has a
+project file, @code{dlltest.dsp}.
+
+If you just want a makefile for Visual C, have a look at
+@code{makefile.msc}.
+
+Be aware that if you compile @code{bzip2} itself on Win32, you must set
+@code{BZ_UNIX} to 0 and @code{BZ_LCCWIN32} to 1, in the file
+@code{bzip2.c}, before compiling.  Otherwise the resulting binary won't
+work correctly.
+
+I haven't tried any of this stuff myself, but it all looks plausible.
+
+
+
+@chapter Miscellanea
+
+These are just some random thoughts of mine.  Your mileage may
+vary.
+
+@section Limitations of the compressed file format
+@code{bzip2-1.0}, @code{0.9.5} and @code{0.9.0}
+use exactly the same file format as the previous
+version, @code{bzip2-0.1}.  This decision was made in the interests of
+stability.  Creating yet another incompatible compressed file format
+would create further confusion and disruption for users.
+
+Nevertheless, this is not a painless decision.  Development
+work since the release of @code{bzip2-0.1} in August 1997
+has shown complexities in the file format which slow down
+decompression and, in retrospect, are unnecessary.  These are:
+@itemize @bullet
+@item The run-length encoder, which is the first of the 
+      compression transformations, is entirely irrelevant.
+      The original purpose was to protect the sorting algorithm
+      from the very worst case input: a string of repeated
+      symbols.  But algorithm steps Q6a and Q6b in the original
+      Burrows-Wheeler technical report (SRC-124) show how
+      repeats can be handled without difficulty in block
+      sorting.
+@item The randomisation mechanism doesn't really need to be
+      there.  Udi Manber and Gene Myers published a suffix
+      array construction algorithm a few years back, which
+      can be employed to sort any block, no matter how 
+      repetitive, in O(N log N) time.  Subsequent work by
+      Kunihiko Sadakane has produced a derivative O(N (log N)^2) 
+      algorithm which usually outperforms the Manber-Myers
+      algorithm.
+
+      I could have changed to Sadakane's algorithm, but I find
+      it to be slower than @code{bzip2}'s existing algorithm for
+      most inputs, and the randomisation mechanism protects
+      adequately against bad cases.  I didn't think it was
+      a good tradeoff to make.  Partly this is due to the fact
+      that I was not flooded with email complaints about
+      @code{bzip2-0.1}'s performance on repetitive data, so
+      perhaps it isn't a problem for real inputs.
+
+      Probably the best long-term solution,
+      and the one I have incorporated into 0.9.5 and above,
+      is to use the existing sorting
+      algorithm initially, and fall back to a O(N (log N)^2)
+      algorithm if the standard algorithm gets into difficulties.
+@item The compressed file format was never designed to be
+      handled by a library, and I have had to jump though
+      some hoops to produce an efficient implementation of
+      decompression.  It's a bit hairy.  Try passing
+      @code{decompress.c} through the C preprocessor 
+      and you'll see what I mean.  Much of this complexity
+      could have been avoided if the compressed size of
+      each block of data was recorded in the data stream.
+@item An Adler-32 checksum, rather than a CRC32 checksum,
+      would be faster to compute.
+@end itemize
+It would be fair to say that the @code{bzip2} format was frozen
+before I properly and fully understood the performance
+consequences of doing so.
+
+Improvements which I was able to incorporate into
+0.9.0, despite using the same file format, are:
+@itemize @bullet
+@item Single array implementation of the inverse BWT.  This
+      significantly speeds up decompression, presumably
+      because it reduces the number of cache misses.
+@item Faster inverse MTF transform for large MTF values.  The
+      new implementation is based on the notion of sliding blocks
+      of values.
+@item @code{bzip2-0.9.0} now reads and writes files with @code{fread}
+      and @code{fwrite}; version 0.1 used @code{putc} and @code{getc}.
+      Duh!  Well, you live and learn.
+
+@end itemize
+Further ahead, it would be nice 
+to be able to do random access into files.  This will 
+require some careful design of compressed file formats.
+
+
+
+@section Portability issues
+After some consideration, I have decided not to use
+GNU @code{autoconf} to configure 0.9.5 or 1.0.
+
+@code{autoconf}, admirable and wonderful though it is, 
+mainly assists with portability problems between Unix-like
+platforms.  But @code{bzip2} doesn't have much in the way
+of portability problems on Unix; most of the difficulties appear
+when porting to the Mac, or to Microsoft's operating systems.
+@code{autoconf} doesn't help in those cases, and brings in a 
+whole load of new complexity.
+
+Most people should be able to compile the library and program
+under Unix straight out-of-the-box, so to speak, especially 
+if you have a version of GNU C available.
+
+There are a couple of @code{__inline__} directives in the code.  GNU C
+(@code{gcc}) should be able to handle them.  If you're not using
+GNU C, your C compiler shouldn't see them at all.
+If your compiler does, for some reason, see them and doesn't
+like them, just @code{#define} @code{__inline__} to be @code{/* */}.  One
+easy way to do this is to compile with the flag @code{-D__inline__=}, 
+which should be understood by most Unix compilers.
+
+If you still have difficulties, try compiling with the macro
+@code{BZ_STRICT_ANSI} defined.  This should enable you to build the
+library in a strictly ANSI compliant environment.  Building the program
+itself like this is dangerous and not supported, since you remove
+@code{bzip2}'s checks against compressing directories, symbolic links,
+devices, and other not-really-a-file entities.  This could cause
+filesystem corruption!
+
+One other thing: if you create a @code{bzip2} binary for public
+distribution, please try and link it statically (@code{gcc -s}).  This
+avoids all sorts of library-version issues that others may encounter
+later on.
+
+If you build @code{bzip2} on Win32, you must set @code{BZ_UNIX} to 0 and
+@code{BZ_LCCWIN32} to 1, in the file @code{bzip2.c}, before compiling.
+Otherwise the resulting binary won't work correctly.
+
+
+
+@section Reporting bugs
+I tried pretty hard to make sure @code{bzip2} is
+bug free, both by design and by testing.  Hopefully
+you'll never need to read this section for real.
+
+Nevertheless, if @code{bzip2} dies with a segmentation
+fault, a bus error or an internal assertion failure, it
+will ask you to email me a bug report.  Experience with
+version 0.1 shows that almost all these problems can
+be traced to either compiler bugs or hardware problems.
+@itemize @bullet
+@item
+Recompile the program with no optimisation, and see if it
+works.  And/or try a different compiler.
+I heard all sorts of stories about various flavours
+of GNU C (and other compilers) generating bad code for
+@code{bzip2}, and I've run across two such examples myself.
+
+2.7.X versions of GNU C are known to generate bad code from
+time to time, at high optimisation levels.  
+If you get problems, try using the flags
+@code{-O2} @code{-fomit-frame-pointer} @code{-fno-strength-reduce}.
+You should specifically @emph{not} use @code{-funroll-loops}.
+
+You may notice that the Makefile runs six tests as part of
+the build process.  If the program passes all of these, it's
+a pretty good (but not 100%) indication that the compiler has
+done its job correctly.
+@item
+If @code{bzip2} crashes randomly, and the crashes are not
+repeatable, you may have a flaky memory subsystem.  @code{bzip2}
+really hammers your memory hierarchy, and if it's a bit marginal,
+you may get these problems.  Ditto if your disk or I/O subsystem
+is slowly failing.  Yup, this really does happen.
+
+Try using a different machine of the same type, and see if
+you can repeat the problem.
+@item This isn't really a bug, but ... If @code{bzip2} tells
+you your file is corrupted on decompression, and you
+obtained the file via FTP, there is a possibility that you
+forgot to tell FTP to do a binary mode transfer.  That absolutely
+will cause the file to be non-decompressible.  You'll have to transfer
+it again.
+@end itemize
+
+If you've incorporated @code{libbzip2} into your own program
+and are getting problems, please, please, please, check that the 
+parameters you are passing in calls to the library, are
+correct, and in accordance with what the documentation says
+is allowable.  I have tried to make the library robust against
+such problems, but I'm sure I haven't succeeded.
+
+Finally, if the above comments don't help, you'll have to send
+me a bug report.  Now, it's just amazing how many people will 
+send me a bug report saying something like
+@display
+   bzip2 crashed with segmentation fault on my machine
+@end display
+and absolutely nothing else.  Needless to say, a such a report
+is @emph{totally, utterly, completely and comprehensively 100% useless; 
+a waste of your time, my time, and net bandwidth}.
+With no details at all, there's no way I can possibly begin
+to figure out what the problem is.
+
+The rules of the game are: facts, facts, facts.  Don't omit
+them because "oh, they won't be relevant".  At the bare 
+minimum:
+@display
+   Machine type.  Operating system version.  
+   Exact version of @code{bzip2} (do @code{bzip2 -V}).  
+   Exact version of the compiler used.  
+   Flags passed to the compiler.
+@end display
+However, the most important single thing that will help me is
+the file that you were trying to compress or decompress at the
+time the problem happened.  Without that, my ability to do anything
+more than speculate about the cause, is limited.
+
+Please remember that I connect to the Internet with a modem, so
+you should contact me before mailing me huge files.
+
+
+@section Did you get the right package?
+
+@code{bzip2} is a resource hog.  It soaks up large amounts of CPU cycles
+and memory.  Also, it gives very large latencies.  In the worst case, you
+can feed many megabytes of uncompressed data into the library before
+getting any compressed output, so this probably rules out applications
+requiring interactive behaviour.
+
+These aren't faults of my implementation, I hope, but more
+an intrinsic property of the Burrows-Wheeler transform (unfortunately).  
+Maybe this isn't what you want.
+
+If you want a compressor and/or library which is faster, uses less
+memory but gets pretty good compression, and has minimal latency,
+consider Jean-loup
+Gailly's and Mark Adler's work, @code{zlib-1.1.2} and
+@code{gzip-1.2.4}.  Look for them at
+
+@code{http://www.cdrom.com/pub/infozip/zlib} and
+@code{http://www.gzip.org} respectively.
+
+For something faster and lighter still, you might try Markus F X J
+Oberhumer's @code{LZO} real-time compression/decompression library, at
+@* @code{http://wildsau.idv.uni-linz.ac.at/mfx/lzo.html}.
+
+If you want to use the @code{bzip2} algorithms to compress small blocks
+of data, 64k bytes or smaller, for example on an on-the-fly disk
+compressor, you'd be well advised not to use this library.  Instead,
+I've made a special library tuned for that kind of use.  It's part of
+@code{e2compr-0.40}, an on-the-fly disk compressor for the Linux
+@code{ext2} filesystem.  Look at
+@code{http://www.netspace.net.au/~reiter/e2compr}.
+
+
+
+@section Testing
+
+A record of the tests I've done.
+
+First, some data sets:
+@itemize @bullet
+@item B: a directory containing 6001 files, one for every length in the
+      range 0 to 6000 bytes.  The files contain random lowercase
+      letters.  18.7 megabytes.
+@item H: my home directory tree.  Documents, source code, mail files,
+      compressed data.  H contains B, and also a directory of 
+      files designed as boundary cases for the sorting; mostly very
+      repetitive, nasty files.  565 megabytes.
+@item A: directory tree holding various applications built from source:
+      @code{egcs}, @code{gcc-2.8.1}, KDE, GTK, Octave, etc.
+      2200 megabytes.
+@end itemize
+The tests conducted are as follows.  Each test means compressing 
+(a copy of) each file in the data set, decompressing it and
+comparing it against the original.
+
+First, a bunch of tests with block sizes and internal buffer
+sizes set very small, 
+to detect any problems with the
+blocking and buffering mechanisms.  
+This required modifying the source code so as to try to 
+break it.
+@enumerate
+@item Data set H, with
+      buffer size of 1 byte, and block size of 23 bytes.
+@item Data set B, buffer sizes 1 byte, block size 1 byte.
+@item As (2) but small-mode decompression.
+@item As (2) with block size 2 bytes.
+@item As (2) with block size 3 bytes.
+@item As (2) with block size 4 bytes.
+@item As (2) with block size 5 bytes.
+@item As (2) with block size 6 bytes and small-mode decompression.
+@item H with buffer size of 1 byte, but normal block
+      size (up to 900000 bytes).
+@end enumerate
+Then some tests with unmodified source code.
+@enumerate
+@item H, all settings normal.
+@item As (1), with small-mode decompress.
+@item H, compress with flag @code{-1}.
+@item H, compress with flag @code{-s}, decompress with flag @code{-s}.
+@item Forwards compatibility: H, @code{bzip2-0.1pl2} compressing,
+      @code{bzip2-0.9.5} decompressing, all settings normal.
+@item Backwards compatibility:  H, @code{bzip2-0.9.5} compressing,
+      @code{bzip2-0.1pl2} decompressing, all settings normal.
+@item Bigger tests: A, all settings normal.
+@item As (7), using the fallback (Sadakane-like) sorting algorithm.
+@item As (8), compress with flag @code{-1}, decompress with flag
+      @code{-s}.
+@item H, using the fallback sorting algorithm.
+@item Forwards compatibility: A, @code{bzip2-0.1pl2} compressing,
+      @code{bzip2-0.9.5} decompressing, all settings normal.
+@item Backwards compatibility:  A, @code{bzip2-0.9.5} compressing,
+      @code{bzip2-0.1pl2} decompressing, all settings normal.
+@item Misc test: about 400 megabytes of @code{.tar} files with
+      @code{bzip2} compiled with Checker (a memory access error
+       detector, like Purify).
+@item Misc tests to make sure it builds and runs ok on non-Linux/x86
+      platforms.
+@end enumerate
+These tests were conducted on a 225 MHz IDT WinChip machine, running
+Linux 2.0.36.  They represent nearly a week of continuous computation.
+All tests completed successfully.
+
+
+@section Further reading
+@code{bzip2} is not research work, in the sense that it doesn't present
+any new ideas.  Rather, it's an engineering exercise based on existing
+ideas.
+
+Four documents describe essentially all the ideas behind @code{bzip2}:
+@example
+Michael Burrows and D. J. Wheeler:
+  "A block-sorting lossless data compression algorithm"
+   10th May 1994. 
+   Digital SRC Research Report 124.
+   ftp://ftp.digital.com/pub/DEC/SRC/research-reports/SRC-124.ps.gz
+   If you have trouble finding it, try searching at the
+   New Zealand Digital Library, http://www.nzdl.org.
+
+Daniel S. Hirschberg and Debra A. LeLewer
+  "Efficient Decoding of Prefix Codes"
+   Communications of the ACM, April 1990, Vol 33, Number 4.
+   You might be able to get an electronic copy of this
+      from the ACM Digital Library.
+
+David J. Wheeler
+   Program bred3.c and accompanying document bred3.ps.
+   This contains the idea behind the multi-table Huffman
+   coding scheme.
+   ftp://ftp.cl.cam.ac.uk/users/djw3/
+
+Jon L. Bentley and Robert Sedgewick
+  "Fast Algorithms for Sorting and Searching Strings"
+   Available from Sedgewick's web page,
+   www.cs.princeton.edu/~rs
+@end example
+The following paper gives valuable additional insights into the
+algorithm, but is not immediately the basis of any code
+used in bzip2.
+@example
+Peter Fenwick:
+   Block Sorting Text Compression
+   Proceedings of the 19th Australasian Computer Science Conference,
+     Melbourne, Australia.  Jan 31 - Feb 2, 1996.
+   ftp://ftp.cs.auckland.ac.nz/pub/peter-f/ACSC96paper.ps
+@end example
+Kunihiko Sadakane's sorting algorithm, mentioned above,
+is available from:
+@example
+http://naomi.is.s.u-tokyo.ac.jp/~sada/papers/Sada98b.ps.gz
+@end example
+The Manber-Myers suffix array construction
+algorithm is described in a paper
+available from:
+@example
+http://www.cs.arizona.edu/people/gene/PAPERS/suffix.ps
+@end example
+Finally, the following paper documents some recent investigations
+I made into the performance of sorting algorithms:
+@example
+Julian Seward:
+   On the Performance of BWT Sorting Algorithms
+   Proceedings of the IEEE Data Compression Conference 2000
+     Snowbird, Utah.  28-30 March 2000.
+@end example
+
+
+@contents
+
+@bye
+
diff --git a/winsup/bz2lib/manual_1.html b/winsup/bz2lib/manual_1.html
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+<HTML>
+<HEAD>
+<!-- This HTML file has been created by texi2html 1.54
+     from manual.texi on 23 March 2000 -->
+
+<TITLE>bzip2 and libbzip2 - Introduction</TITLE>
+<link href="manual_2.html" rel=Next>
+<link href="manual_toc.html" rel=ToC>
+
+</HEAD>
+<BODY>
+<p>Go to the first, previous, <A HREF="manual_2.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>.
+<P><HR><P>
+
+
+<H1><A NAME="SEC1" HREF="manual_toc.html#TOC1">Introduction</A></H1>
+
+<P>
+<CODE>bzip2</CODE>  compresses  files  using the Burrows-Wheeler 
+block-sorting text compression algorithm,  and  Huffman  coding.
+Compression  is  generally  considerably  better than that
+achieved by more conventional LZ77/LZ78-based compressors,
+and  approaches  the performance of the PPM family of statistical compressors.
+
+</P>
+<P>
+<CODE>bzip2</CODE> is built on top of <CODE>libbzip2</CODE>, a flexible library
+for handling compressed data in the <CODE>bzip2</CODE> format.  This manual
+describes both how to use the program and 
+how to work with the library interface.  Most of the
+manual is devoted to this library, not the program, 
+which is good news if your interest is only in the program.
+
+</P>
+<P>
+Chapter 2 describes how to use <CODE>bzip2</CODE>; this is the only part 
+you need to read if you just want to know how to operate the program.
+Chapter 3 describes the programming interfaces in detail, and
+Chapter 4 records some miscellaneous notes which I thought
+ought to be recorded somewhere.
+
+</P>
+
+<P><HR><P>
+<p>Go to the first, previous, <A HREF="manual_2.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>.
+</BODY>
+</HTML>
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+<HTML>
+<HEAD>
+<!-- This HTML file has been created by texi2html 1.54
+     from manual.texi on 23 March 2000 -->
+
+<TITLE>bzip2 and libbzip2 - How to use bzip2</TITLE>
+<link href="manual_3.html" rel=Next>
+<link href="manual_1.html" rel=Previous>
+<link href="manual_toc.html" rel=ToC>
+
+</HEAD>
+<BODY>
+<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_1.html">previous</A>, <A HREF="manual_3.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>.
+<P><HR><P>
+
+
+<H1><A NAME="SEC2" HREF="manual_toc.html#TOC2">How to use <CODE>bzip2</CODE></A></H1>
+
+<P>
+This chapter contains a copy of the <CODE>bzip2</CODE> man page,
+and nothing else.
+
+</P>
+
+<BLOCKQUOTE>
+
+
+
+<H4><A NAME="SEC3" HREF="manual_toc.html#TOC3">NAME</A></H4>
+
+<UL>
+<LI><CODE>bzip2</CODE>, <CODE>bunzip2</CODE>
+
+- a block-sorting file compressor, v1.0
+<LI><CODE>bzcat</CODE>
+
+- decompresses files to stdout
+<LI><CODE>bzip2recover</CODE>
+
+- recovers data from damaged bzip2 files
+</UL>
+
+
+
+<H4><A NAME="SEC4" HREF="manual_toc.html#TOC4">SYNOPSIS</A></H4>
+
+<UL>
+<LI><CODE>bzip2</CODE> [ -cdfkqstvzVL123456789 ] [ filenames ...  ]
+
+<LI><CODE>bunzip2</CODE> [ -fkvsVL ] [ filenames ...  ]
+
+<LI><CODE>bzcat</CODE> [ -s ] [ filenames ...  ]
+
+<LI><CODE>bzip2recover</CODE> filename
+
+</UL>
+
+
+
+<H4><A NAME="SEC5" HREF="manual_toc.html#TOC5">DESCRIPTION</A></H4>
+
+<P>
+<CODE>bzip2</CODE> compresses files using the Burrows-Wheeler block sorting
+text compression algorithm, and Huffman coding.  Compression is
+generally considerably better than that achieved by more conventional
+LZ77/LZ78-based compressors, and approaches the performance of the PPM
+family of statistical compressors.
+
+</P>
+<P>
+The command-line options are deliberately very similar to those of GNU
+<CODE>gzip</CODE>, but they are not identical.
+
+</P>
+<P>
+<CODE>bzip2</CODE> expects a list of file names to accompany the command-line
+flags.  Each file is replaced by a compressed version of itself, with
+the name <CODE>original_name.bz2</CODE>.  Each compressed file has the same
+modification date, permissions, and, when possible, ownership as the
+corresponding original, so that these properties can be correctly
+restored at decompression time.  File name handling is naive in the
+sense that there is no mechanism for preserving original file names,
+permissions, ownerships or dates in filesystems which lack these
+concepts, or have serious file name length restrictions, such as MS-DOS.
+
+</P>
+<P>
+<CODE>bzip2</CODE> and <CODE>bunzip2</CODE> will by default not overwrite existing
+files.  If you want this to happen, specify the <CODE>-f</CODE> flag.
+
+</P>
+<P>
+If no file names are specified, <CODE>bzip2</CODE> compresses from standard
+input to standard output.  In this case, <CODE>bzip2</CODE> will decline to
+write compressed output to a terminal, as this would be entirely
+incomprehensible and therefore pointless.
+
+</P>
+<P>
+<CODE>bunzip2</CODE> (or <CODE>bzip2 -d</CODE>) decompresses all
+specified files.  Files which were not created by <CODE>bzip2</CODE>
+will be detected and ignored, and a warning issued.  
+<CODE>bzip2</CODE> attempts to guess the filename for the decompressed file 
+from that of the compressed file as follows:
+
+<UL>
+<LI><CODE>filename.bz2 </CODE> becomes <CODE>filename</CODE>
+
+<LI><CODE>filename.bz  </CODE> becomes <CODE>filename</CODE>
+
+<LI><CODE>filename.tbz2</CODE> becomes <CODE>filename.tar</CODE>
+
+<LI><CODE>filename.tbz </CODE> becomes <CODE>filename.tar</CODE>
+
+<LI><CODE>anyothername </CODE> becomes <CODE>anyothername.out</CODE>
+
+</UL>
+
+<P>
+If the file does not end in one of the recognised endings, 
+<CODE>.bz2</CODE>, <CODE>.bz</CODE>, 
+<CODE>.tbz2</CODE> or <CODE>.tbz</CODE>, <CODE>bzip2</CODE> complains that it cannot
+guess the name of the original file, and uses the original name
+with <CODE>.out</CODE> appended.
+
+</P>
+<P>
+As with compression, supplying no
+filenames causes decompression from standard input to standard output.
+
+</P>
+<P>
+<CODE>bunzip2</CODE> will correctly decompress a file which is the
+concatenation of two or more compressed files.  The result is the
+concatenation of the corresponding uncompressed files.  Integrity
+testing (<CODE>-t</CODE>) of concatenated compressed files is also supported.
+
+</P>
+<P>
+You can also compress or decompress files to the standard output by
+giving the <CODE>-c</CODE> flag.  Multiple files may be compressed and
+decompressed like this.  The resulting outputs are fed sequentially to
+stdout.  Compression of multiple files in this manner generates a stream
+containing multiple compressed file representations.  Such a stream
+can be decompressed correctly only by <CODE>bzip2</CODE> version 0.9.0 or
+later.  Earlier versions of <CODE>bzip2</CODE> will stop after decompressing
+the first file in the stream.
+
+</P>
+<P>
+<CODE>bzcat</CODE> (or <CODE>bzip2 -dc</CODE>) decompresses all specified files to
+the standard output.
+
+</P>
+<P>
+<CODE>bzip2</CODE> will read arguments from the environment variables
+<CODE>BZIP2</CODE> and <CODE>BZIP</CODE>, in that order, and will process them
+before any arguments read from the command line.  This gives a 
+convenient way to supply default arguments.
+
+</P>
+<P>
+Compression is always performed, even if the compressed file is slightly
+larger than the original.  Files of less than about one hundred bytes
+tend to get larger, since the compression mechanism has a constant
+overhead in the region of 50 bytes.  Random data (including the output
+of most file compressors) is coded at about 8.05 bits per byte, giving
+an expansion of around 0.5%.
+
+</P>
+<P>
+As a self-check for your protection, <CODE>bzip2</CODE> uses 32-bit CRCs to
+make sure that the decompressed version of a file is identical to the
+original.  This guards against corruption of the compressed data, and
+against undetected bugs in <CODE>bzip2</CODE> (hopefully very unlikely).  The
+chances of data corruption going undetected is microscopic, about one
+chance in four billion for each file processed.  Be aware, though, that
+the check occurs upon decompression, so it can only tell you that
+something is wrong.  It can't help you recover the original uncompressed
+data.  You can use <CODE>bzip2recover</CODE> to try to recover data from
+damaged files.
+
+</P>
+<P>
+Return values: 0 for a normal exit, 1 for environmental problems (file
+not found, invalid flags, I/O errors, &#38;c), 2 to indicate a corrupt
+compressed file, 3 for an internal consistency error (eg, bug) which
+caused <CODE>bzip2</CODE> to panic.
+
+</P>
+
+
+
+<H4><A NAME="SEC6" HREF="manual_toc.html#TOC6">OPTIONS</A></H4>
+<DL COMPACT>
+
+<DT><CODE>-c  --stdout</CODE>
+<DD>
+Compress or decompress to standard output.
+<DT><CODE>-d  --decompress</CODE>
+<DD>
+Force decompression.  <CODE>bzip2</CODE>, <CODE>bunzip2</CODE> and <CODE>bzcat</CODE> are
+really the same program, and the decision about what actions to take is
+done on the basis of which name is used.  This flag overrides that
+mechanism, and forces bzip2 to decompress.
+<DT><CODE>-z --compress</CODE>
+<DD>
+The complement to <CODE>-d</CODE>: forces compression, regardless of the
+invokation name.
+<DT><CODE>-t --test</CODE>
+<DD>
+Check integrity of the specified file(s), but don't decompress them.
+This really performs a trial decompression and throws away the result.
+<DT><CODE>-f --force</CODE>
+<DD>
+Force overwrite of output files.  Normally, <CODE>bzip2</CODE> will not overwrite
+existing output files.  Also forces <CODE>bzip2</CODE> to break hard links
+to files, which it otherwise wouldn't do.
+<DT><CODE>-k --keep</CODE>
+<DD>
+Keep (don't delete) input files during compression
+or decompression.
+<DT><CODE>-s --small</CODE>
+<DD>
+Reduce memory usage, for compression, decompression and testing.  Files
+are decompressed and tested using a modified algorithm which only
+requires 2.5 bytes per block byte.  This means any file can be
+decompressed in 2300k of memory, albeit at about half the normal speed.
+
+During compression, <CODE>-s</CODE> selects a block size of 200k, which limits
+memory use to around the same figure, at the expense of your compression
+ratio.  In short, if your machine is low on memory (8 megabytes or
+less), use -s for everything.  See MEMORY MANAGEMENT below.
+<DT><CODE>-q --quiet</CODE>
+<DD>
+Suppress non-essential warning messages.  Messages pertaining to
+I/O errors and other critical events will not be suppressed.
+<DT><CODE>-v --verbose</CODE>
+<DD>
+Verbose mode -- show the compression ratio for each file processed.
+Further <CODE>-v</CODE>'s increase the verbosity level, spewing out lots of
+information which is primarily of interest for diagnostic purposes.
+<DT><CODE>-L --license -V --version</CODE>
+<DD>
+Display the software version, license terms and conditions.
+<DT><CODE>-1 to -9</CODE>
+<DD>
+Set the block size to 100 k, 200 k ..  900 k when compressing.  Has no
+effect when decompressing.  See MEMORY MANAGEMENT below.
+<DT><CODE>--</CODE>
+<DD>
+Treats all subsequent arguments as file names, even if they start
+with a dash.  This is so you can handle files with names beginning
+with a dash, for example: <CODE>bzip2 -- -myfilename</CODE>.
+<DT><CODE>--repetitive-fast</CODE>
+<DD>
+<DT><CODE>--repetitive-best</CODE>
+<DD>
+These flags are redundant in versions 0.9.5 and above.  They provided
+some coarse control over the behaviour of the sorting algorithm in
+earlier versions, which was sometimes useful.  0.9.5 and above have an
+improved algorithm which renders these flags irrelevant.
+</DL>
+
+
+
+<H4><A NAME="SEC7" HREF="manual_toc.html#TOC7">MEMORY MANAGEMENT</A></H4>
+
+<P>
+<CODE>bzip2</CODE> compresses large files in blocks.  The block size affects
+both the compression ratio achieved, and the amount of memory needed for
+compression and decompression.  The flags <CODE>-1</CODE> through <CODE>-9</CODE>
+specify the block size to be 100,000 bytes through 900,000 bytes (the
+default) respectively.  At decompression time, the block size used for
+compression is read from the header of the compressed file, and
+<CODE>bunzip2</CODE> then allocates itself just enough memory to decompress
+the file.  Since block sizes are stored in compressed files, it follows
+that the flags <CODE>-1</CODE> to <CODE>-9</CODE> are irrelevant to and so ignored
+during decompression.
+
+</P>
+<P>
+Compression and decompression requirements, in bytes, can be estimated
+as:
+
+<PRE>
+     Compression:   400k + ( 8 x block size )
+
+     Decompression: 100k + ( 4 x block size ), or
+                    100k + ( 2.5 x block size )
+</PRE>
+
+<P>
+Larger block sizes give rapidly diminishing marginal returns.  Most of
+the compression comes from the first two or three hundred k of block
+size, a fact worth bearing in mind when using <CODE>bzip2</CODE> on small machines.
+It is also important to appreciate that the decompression memory
+requirement is set at compression time by the choice of block size.
+
+</P>
+<P>
+For files compressed with the default 900k block size, <CODE>bunzip2</CODE>
+will require about 3700 kbytes to decompress.  To support decompression
+of any file on a 4 megabyte machine, <CODE>bunzip2</CODE> has an option to
+decompress using approximately half this amount of memory, about 2300
+kbytes.  Decompression speed is also halved, so you should use this
+option only where necessary.  The relevant flag is <CODE>-s</CODE>.
+
+</P>
+<P>
+In general, try and use the largest block size memory constraints allow,
+since that maximises the compression achieved.  Compression and
+decompression speed are virtually unaffected by block size.
+
+</P>
+<P>
+Another significant point applies to files which fit in a single block
+-- that means most files you'd encounter using a large block size.  The
+amount of real memory touched is proportional to the size of the file,
+since the file is smaller than a block.  For example, compressing a file
+20,000 bytes long with the flag <CODE>-9</CODE> will cause the compressor to
+allocate around 7600k of memory, but only touch 400k + 20000 * 8 = 560
+kbytes of it.  Similarly, the decompressor will allocate 3700k but only
+touch 100k + 20000 * 4 = 180 kbytes.
+
+</P>
+<P>
+Here is a table which summarises the maximum memory usage for different
+block sizes.  Also recorded is the total compressed size for 14 files of
+the Calgary Text Compression Corpus totalling 3,141,622 bytes.  This
+column gives some feel for how compression varies with block size.
+These figures tend to understate the advantage of larger block sizes for
+larger files, since the Corpus is dominated by smaller files.
+
+<PRE>
+          Compress   Decompress   Decompress   Corpus
+   Flag     usage      usage       -s usage     Size
+
+    -1      1200k       500k         350k      914704
+    -2      2000k       900k         600k      877703
+    -3      2800k      1300k         850k      860338
+    -4      3600k      1700k        1100k      846899
+    -5      4400k      2100k        1350k      845160
+    -6      5200k      2500k        1600k      838626
+    -7      6100k      2900k        1850k      834096
+    -8      6800k      3300k        2100k      828642
+    -9      7600k      3700k        2350k      828642
+</PRE>
+
+
+
+<H4><A NAME="SEC8" HREF="manual_toc.html#TOC8">RECOVERING DATA FROM DAMAGED FILES</A></H4>
+
+<P>
+<CODE>bzip2</CODE> compresses files in blocks, usually 900kbytes long.  Each
+block is handled independently.  If a media or transmission error causes
+a multi-block <CODE>.bz2</CODE> file to become damaged, it may be possible to
+recover data from the undamaged blocks in the file.
+
+</P>
+<P>
+The compressed representation of each block is delimited by a 48-bit
+pattern, which makes it possible to find the block boundaries with
+reasonable certainty.  Each block also carries its own 32-bit CRC, so
+damaged blocks can be distinguished from undamaged ones.
+
+</P>
+<P>
+<CODE>bzip2recover</CODE> is a simple program whose purpose is to search for
+blocks in <CODE>.bz2</CODE> files, and write each block out into its own
+<CODE>.bz2</CODE> file.  You can then use <CODE>bzip2 -t</CODE> to test the
+integrity of the resulting files, and decompress those which are
+undamaged.
+
+</P>
+<P>
+<CODE>bzip2recover</CODE> 
+takes a single argument, the name of the damaged file, 
+and writes a number of files <CODE>rec0001file.bz2</CODE>,
+       <CODE>rec0002file.bz2</CODE>, etc, containing the  extracted  blocks.
+       The  output  filenames  are  designed  so  that the use of
+       wildcards in subsequent processing -- for example,  
+<CODE>bzip2 -dc  rec*file.bz2 &#62; recovered_data</CODE> -- lists the files in
+       the correct order.
+
+</P>
+<P>
+<CODE>bzip2recover</CODE> should be of most use dealing with large <CODE>.bz2</CODE>
+       files,  as  these will contain many blocks.  It is clearly
+       futile to use it on damaged single-block  files,  since  a
+       damaged  block  cannot  be recovered.  If you wish to minimise 
+any potential data loss through media  or  transmission errors, 
+you might consider compressing with a smaller
+       block size.
+
+</P>
+
+
+
+<H4><A NAME="SEC9" HREF="manual_toc.html#TOC9">PERFORMANCE NOTES</A></H4>
+
+<P>
+The sorting phase of compression gathers together similar strings in the
+file.  Because of this, files containing very long runs of repeated
+symbols, like "aabaabaabaab ..."  (repeated several hundred times) may
+compress more slowly than normal.  Versions 0.9.5 and above fare much
+better than previous versions in this respect.  The ratio between
+worst-case and average-case compression time is in the region of 10:1.
+For previous versions, this figure was more like 100:1.  You can use the
+<CODE>-vvvv</CODE> option to monitor progress in great detail, if you want.
+
+</P>
+<P>
+Decompression speed is unaffected by these phenomena.
+
+</P>
+<P>
+<CODE>bzip2</CODE> usually allocates several megabytes of memory to operate
+in, and then charges all over it in a fairly random fashion.  This means
+that performance, both for compressing and decompressing, is largely
+determined by the speed at which your machine can service cache misses.
+Because of this, small changes to the code to reduce the miss rate have
+been observed to give disproportionately large performance improvements.
+I imagine <CODE>bzip2</CODE> will perform best on machines with very large
+caches.
+
+</P>
+
+
+
+<H4><A NAME="SEC10" HREF="manual_toc.html#TOC10">CAVEATS</A></H4>
+
+<P>
+I/O error messages are not as helpful as they could be.  <CODE>bzip2</CODE>
+tries hard to detect I/O errors and exit cleanly, but the details of
+what the problem is sometimes seem rather misleading.
+
+</P>
+<P>
+This manual page pertains to version 1.0 of <CODE>bzip2</CODE>.  Compressed
+data created by this version is entirely forwards and backwards
+compatible with the previous public releases, versions 0.1pl2, 0.9.0 and
+0.9.5, but with the following exception: 0.9.0 and above can correctly
+decompress multiple concatenated compressed files.  0.1pl2 cannot do
+this; it will stop after decompressing just the first file in the
+stream.
+
+</P>
+<P>
+<CODE>bzip2recover</CODE> uses 32-bit integers to represent bit positions in
+compressed files, so it cannot handle compressed files more than 512
+megabytes long.  This could easily be fixed.
+
+</P>
+
+
+
+<H4><A NAME="SEC11" HREF="manual_toc.html#TOC11">AUTHOR</A></H4>
+<P>
+Julian Seward, <CODE>jseward@acm.org</CODE>.
+
+</P>
+<P>
+The ideas embodied in <CODE>bzip2</CODE> are due to (at least) the following
+people: Michael Burrows and David Wheeler (for the block sorting
+transformation), David Wheeler (again, for the Huffman coder), Peter
+Fenwick (for the structured coding model in the original <CODE>bzip</CODE>,
+and many refinements), and Alistair Moffat, Radford Neal and Ian Witten
+(for the arithmetic coder in the original <CODE>bzip</CODE>).  I am much
+indebted for their help, support and advice.  See the manual in the
+source distribution for pointers to sources of documentation.  Christian
+von Roques encouraged me to look for faster sorting algorithms, so as to
+speed up compression.  Bela Lubkin encouraged me to improve the
+worst-case compression performance.  Many people sent patches, helped
+with portability problems, lent machines, gave advice and were generally
+helpful.
+
+</P>
+</BLOCKQUOTE>
+
+<P><HR><P>
+<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_1.html">previous</A>, <A HREF="manual_3.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>.
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+
+
+<H1><A NAME="SEC12" HREF="manual_toc.html#TOC12">Programming with <CODE>libbzip2</CODE></A></H1>
+
+<P>
+This chapter describes the programming interface to <CODE>libbzip2</CODE>.
+
+</P>
+<P>
+For general background information, particularly about memory
+use and performance aspects, you'd be well advised to read Chapter 2
+as well.
+
+</P>
+
+
+<H2><A NAME="SEC13" HREF="manual_toc.html#TOC13">Top-level structure</A></H2>
+
+<P>
+<CODE>libbzip2</CODE> is a flexible library for compressing and decompressing
+data in the <CODE>bzip2</CODE> data format.  Although packaged as a single
+entity, it helps to regard the library as three separate parts: the low
+level interface, and the high level interface, and some utility
+functions.
+
+</P>
+<P>
+The structure of <CODE>libbzip2</CODE>'s interfaces is similar to
+that of Jean-loup Gailly's and Mark Adler's excellent <CODE>zlib</CODE> 
+library.
+
+</P>
+<P>
+All externally visible symbols have names beginning <CODE>BZ2_</CODE>.
+This is new in version 1.0.  The intention is to minimise pollution
+of the namespaces of library clients.
+
+</P>
+
+
+<H3><A NAME="SEC14" HREF="manual_toc.html#TOC14">Low-level summary</A></H3>
+
+<P>
+This interface provides services for compressing and decompressing
+data in memory.  There's no provision for dealing with files, streams
+or any other I/O mechanisms, just straight memory-to-memory work.
+In fact, this part of the library can be compiled without inclusion
+of <CODE>stdio.h</CODE>, which may be helpful for embedded applications.
+
+</P>
+<P>
+The low-level part of the library has no global variables and
+is therefore thread-safe.
+
+</P>
+<P>
+Six routines make up the low level interface: 
+<CODE>BZ2_bzCompressInit</CODE>, <CODE>BZ2_bzCompress</CODE>, and <BR> <CODE>BZ2_bzCompressEnd</CODE>
+for compression,
+and a corresponding trio <CODE>BZ2_bzDecompressInit</CODE>, <BR> <CODE>BZ2_bzDecompress</CODE>
+and <CODE>BZ2_bzDecompressEnd</CODE> for decompression.  
+The <CODE>*Init</CODE> functions allocate
+memory for compression/decompression and do other
+initialisations, whilst the <CODE>*End</CODE> functions close down operations
+and release memory.
+
+</P>
+<P>
+The real work is done by <CODE>BZ2_bzCompress</CODE> and <CODE>BZ2_bzDecompress</CODE>.  
+These compress and decompress data from a user-supplied input buffer
+to a user-supplied output buffer.  These buffers can be any size;
+arbitrary quantities of data are handled by making repeated calls
+to these functions.  This is a flexible mechanism allowing a 
+consumer-pull style of activity, or producer-push, or a mixture of
+both.
+
+</P>
+
+
+
+<H3><A NAME="SEC15" HREF="manual_toc.html#TOC15">High-level summary</A></H3>
+
+<P>
+This interface provides some handy wrappers around the low-level
+interface to facilitate reading and writing <CODE>bzip2</CODE> format
+files (<CODE>.bz2</CODE> files).  The routines provide hooks to facilitate
+reading files in which the <CODE>bzip2</CODE> data stream is embedded 
+within some larger-scale file structure, or where there are
+multiple <CODE>bzip2</CODE> data streams concatenated end-to-end.
+
+</P>
+<P>
+For reading files, <CODE>BZ2_bzReadOpen</CODE>, <CODE>BZ2_bzRead</CODE>,
+<CODE>BZ2_bzReadClose</CODE> and <BR> <CODE>BZ2_bzReadGetUnused</CODE> are supplied.  For
+writing files, <CODE>BZ2_bzWriteOpen</CODE>, <CODE>BZ2_bzWrite</CODE> and
+<CODE>BZ2_bzWriteFinish</CODE> are available.
+
+</P>
+<P>
+As with the low-level library, no global variables are used
+so the library is per se thread-safe.  However, if I/O errors
+occur whilst reading or writing the underlying compressed files,
+you may have to consult <CODE>errno</CODE> to determine the cause of
+the error.  In that case, you'd need a C library which correctly
+supports <CODE>errno</CODE> in a multithreaded environment.
+
+</P>
+<P>
+To make the library a little simpler and more portable,
+<CODE>BZ2_bzReadOpen</CODE> and <CODE>BZ2_bzWriteOpen</CODE> require you to pass them file
+handles (<CODE>FILE*</CODE>s) which have previously been opened for reading or
+writing respectively.  That avoids portability problems associated with
+file operations and file attributes, whilst not being much of an
+imposition on the programmer.
+
+</P>
+
+
+
+<H3><A NAME="SEC16" HREF="manual_toc.html#TOC16">Utility functions summary</A></H3>
+<P>
+For very simple needs, <CODE>BZ2_bzBuffToBuffCompress</CODE> and
+<CODE>BZ2_bzBuffToBuffDecompress</CODE> are provided.  These compress
+data in memory from one buffer to another buffer in a single
+function call.  You should assess whether these functions
+fulfill your memory-to-memory compression/decompression
+requirements before investing effort in understanding the more
+general but more complex low-level interface.
+
+</P>
+<P>
+Yoshioka Tsuneo (<CODE>QWF00133@niftyserve.or.jp</CODE> /
+<CODE>tsuneo-y@is.aist-nara.ac.jp</CODE>) has contributed some functions to
+give better <CODE>zlib</CODE> compatibility.  These functions are
+<CODE>BZ2_bzopen</CODE>, <CODE>BZ2_bzread</CODE>, <CODE>BZ2_bzwrite</CODE>, <CODE>BZ2_bzflush</CODE>,
+<CODE>BZ2_bzclose</CODE>,
+<CODE>BZ2_bzerror</CODE> and <CODE>BZ2_bzlibVersion</CODE>.  You may find these functions
+more convenient for simple file reading and writing, than those in the
+high-level interface.  These functions are not (yet) officially part of
+the library, and are minimally documented here.  If they break, you
+get to keep all the pieces.  I hope to document them properly when time
+permits.
+
+</P>
+<P>
+Yoshioka also contributed modifications to allow the library to be
+built as a Windows DLL.
+
+</P>
+
+
+
+<H2><A NAME="SEC17" HREF="manual_toc.html#TOC17">Error handling</A></H2>
+
+<P>
+The library is designed to recover cleanly in all situations, including
+the worst-case situation of decompressing random data.  I'm not 
+100% sure that it can always do this, so you might want to add
+a signal handler to catch segmentation violations during decompression
+if you are feeling especially paranoid.  I would be interested in
+hearing more about the robustness of the library to corrupted
+compressed data.
+
+</P>
+<P>
+Version 1.0 is much more robust in this respect than
+0.9.0 or 0.9.5.  Investigations with Checker (a tool for 
+detecting problems with memory management, similar to Purify)
+indicate that, at least for the few files I tested, all single-bit
+errors in the decompressed data are caught properly, with no
+segmentation faults, no reads of uninitialised data and no 
+out of range reads or writes.  So it's certainly much improved,
+although I wouldn't claim it to be totally bombproof.
+
+</P>
+<P>
+The file <CODE>bzlib.h</CODE> contains all definitions needed to use
+the library.  In particular, you should definitely not include
+<CODE>bzlib_private.h</CODE>.
+
+</P>
+<P>
+In <CODE>bzlib.h</CODE>, the various return values are defined.  The following
+list is not intended as an exhaustive description of the circumstances 
+in which a given value may be returned -- those descriptions are given
+later.  Rather, it is intended to convey the rough meaning of each
+return value.  The first five actions are normal and not intended to 
+denote an error situation.
+<DL COMPACT>
+
+<DT><CODE>BZ_OK</CODE>
+<DD>
+The requested action was completed successfully.
+<DT><CODE>BZ_RUN_OK</CODE>
+<DD>
+<DT><CODE>BZ_FLUSH_OK</CODE>
+<DD>
+<DT><CODE>BZ_FINISH_OK</CODE>
+<DD>
+In <CODE>BZ2_bzCompress</CODE>, the requested flush/finish/nothing-special action
+was completed successfully.
+<DT><CODE>BZ_STREAM_END</CODE>
+<DD>
+Compression of data was completed, or the logical stream end was
+detected during decompression.
+</DL>
+
+<P>
+The following return values indicate an error of some kind.
+<DL COMPACT>
+
+<DT><CODE>BZ_CONFIG_ERROR</CODE>
+<DD>
+Indicates that the library has been improperly compiled on your
+platform -- a major configuration error.  Specifically, it means
+that <CODE>sizeof(char)</CODE>, <CODE>sizeof(short)</CODE> and <CODE>sizeof(int)</CODE>
+are not 1, 2 and 4 respectively, as they should be.  Note that the 
+library should still work properly on 64-bit platforms which follow
+the LP64 programming model -- that is, where <CODE>sizeof(long)</CODE>
+and <CODE>sizeof(void*)</CODE> are 8.  Under LP64, <CODE>sizeof(int)</CODE> is
+still 4, so <CODE>libbzip2</CODE>, which doesn't use the <CODE>long</CODE> type,
+is OK.
+<DT><CODE>BZ_SEQUENCE_ERROR</CODE>
+<DD>
+When using the library, it is important to call the functions in the
+correct sequence and with data structures (buffers etc) in the correct
+states.  <CODE>libbzip2</CODE> checks as much as it can to ensure this is
+happening, and returns <CODE>BZ_SEQUENCE_ERROR</CODE> if not.  Code which
+complies precisely with the function semantics, as detailed below,
+should never receive this value; such an event denotes buggy code
+which you should investigate.
+<DT><CODE>BZ_PARAM_ERROR</CODE>
+<DD>
+Returned when a parameter to a function call is out of range 
+or otherwise manifestly incorrect.  As with <CODE>BZ_SEQUENCE_ERROR</CODE>,
+this denotes a bug in the client code.  The distinction between
+<CODE>BZ_PARAM_ERROR</CODE> and <CODE>BZ_SEQUENCE_ERROR</CODE> is a bit hazy, but still worth
+making.
+<DT><CODE>BZ_MEM_ERROR</CODE>
+<DD>
+Returned when a request to allocate memory failed.  Note that the
+quantity of memory needed to decompress a stream cannot be determined
+until the stream's header has been read.  So <CODE>BZ2_bzDecompress</CODE> and
+<CODE>BZ2_bzRead</CODE> may return <CODE>BZ_MEM_ERROR</CODE> even though some of
+the compressed data has been read.  The same is not true for
+compression; once <CODE>BZ2_bzCompressInit</CODE> or <CODE>BZ2_bzWriteOpen</CODE> have
+successfully completed, <CODE>BZ_MEM_ERROR</CODE> cannot occur.
+<DT><CODE>BZ_DATA_ERROR</CODE>
+<DD>
+Returned when a data integrity error is detected during decompression.
+Most importantly, this means when stored and computed CRCs for the
+data do not match.  This value is also returned upon detection of any
+other anomaly in the compressed data.
+<DT><CODE>BZ_DATA_ERROR_MAGIC</CODE>
+<DD>
+As a special case of <CODE>BZ_DATA_ERROR</CODE>, it is sometimes useful to
+know when the compressed stream does not start with the correct
+magic bytes (<CODE>'B' 'Z' 'h'</CODE>).  
+<DT><CODE>BZ_IO_ERROR</CODE>
+<DD>
+Returned by <CODE>BZ2_bzRead</CODE> and <CODE>BZ2_bzWrite</CODE> when there is an error
+reading or writing in the compressed file, and by <CODE>BZ2_bzReadOpen</CODE>
+and <CODE>BZ2_bzWriteOpen</CODE> for attempts to use a file for which the
+error indicator (viz, <CODE>ferror(f)</CODE>) is set.
+On receipt of <CODE>BZ_IO_ERROR</CODE>, the caller should consult
+<CODE>errno</CODE> and/or <CODE>perror</CODE> to acquire operating-system
+specific information about the problem.
+<DT><CODE>BZ_UNEXPECTED_EOF</CODE>
+<DD>
+Returned by <CODE>BZ2_bzRead</CODE> when the compressed file finishes
+before the logical end of stream is detected.
+<DT><CODE>BZ_OUTBUFF_FULL</CODE>
+<DD>
+Returned by <CODE>BZ2_bzBuffToBuffCompress</CODE> and
+<CODE>BZ2_bzBuffToBuffDecompress</CODE> to indicate that the output data
+will not fit into the output buffer provided.
+</DL>
+
+
+
+<H2><A NAME="SEC18" HREF="manual_toc.html#TOC18">Low-level interface</A></H2>
+
+
+
+<H3><A NAME="SEC19" HREF="manual_toc.html#TOC19"><CODE>BZ2_bzCompressInit</CODE></A></H3>
+
+<PRE>
+typedef 
+   struct {
+      char *next_in;
+      unsigned int avail_in;
+      unsigned int total_in_lo32;
+      unsigned int total_in_hi32;
+
+      char *next_out;
+      unsigned int avail_out;
+      unsigned int total_out_lo32;
+      unsigned int total_out_hi32;
+
+      void *state;
+
+      void *(*bzalloc)(void *,int,int);
+      void (*bzfree)(void *,void *);
+      void *opaque;
+   } 
+   bz_stream;
+
+int BZ2_bzCompressInit ( bz_stream *strm, 
+                         int blockSize100k, 
+                         int verbosity,
+                         int workFactor );
+
+</PRE>
+
+<P>
+Prepares for compression.  The <CODE>bz_stream</CODE> structure
+holds all data pertaining to the compression activity.  
+A <CODE>bz_stream</CODE> structure should be allocated and initialised
+prior to the call.
+The fields of <CODE>bz_stream</CODE>
+comprise the entirety of the user-visible data.  <CODE>state</CODE>
+is a pointer to the private data structures required for compression.
+
+</P>
+<P>
+Custom memory allocators are supported, via fields <CODE>bzalloc</CODE>, 
+<CODE>bzfree</CODE>,
+and <CODE>opaque</CODE>.  The value 
+<CODE>opaque</CODE> is passed to as the first argument to
+all calls to <CODE>bzalloc</CODE> and <CODE>bzfree</CODE>, but is 
+otherwise ignored by the library.
+The call <CODE>bzalloc ( opaque, n, m )</CODE> is expected to return a 
+pointer <CODE>p</CODE> to
+<CODE>n * m</CODE> bytes of memory, and <CODE>bzfree ( opaque, p )</CODE> 
+should free
+that memory.
+
+</P>
+<P>
+If you don't want to use a custom memory allocator, set <CODE>bzalloc</CODE>, 
+<CODE>bzfree</CODE> and
+<CODE>opaque</CODE> to <CODE>NULL</CODE>, 
+and the library will then use the standard <CODE>malloc</CODE>/<CODE>free</CODE>
+routines.
+
+</P>
+<P>
+Before calling <CODE>BZ2_bzCompressInit</CODE>, fields <CODE>bzalloc</CODE>, 
+<CODE>bzfree</CODE> and <CODE>opaque</CODE> should
+be filled appropriately, as just described.  Upon return, the internal
+state will have been allocated and initialised, and <CODE>total_in_lo32</CODE>, 
+<CODE>total_in_hi32</CODE>, <CODE>total_out_lo32</CODE> and 
+<CODE>total_out_hi32</CODE> will have been set to zero.  
+These four fields are used by the library
+to inform the caller of the total amount of data passed into and out of
+the library, respectively.  You should not try to change them.
+As of version 1.0, 64-bit counts are maintained, even on 32-bit
+platforms, using the <CODE>_hi32</CODE> fields to store the upper 32 bits
+of the count.  So, for example, the total amount of data in
+is <CODE>(total_in_hi32 &#60;&#60; 32) + total_in_lo32</CODE>.
+
+</P>
+<P>
+Parameter <CODE>blockSize100k</CODE> specifies the block size to be used for
+compression.  It should be a value between 1 and 9 inclusive, and the
+actual block size used is 100000 x this figure.  9 gives the best
+compression but takes most memory.
+
+</P>
+<P>
+Parameter <CODE>verbosity</CODE> should be set to a number between 0 and 4
+inclusive.  0 is silent, and greater numbers give increasingly verbose
+monitoring/debugging output.  If the library has been compiled with
+<CODE>-DBZ_NO_STDIO</CODE>, no such output will appear for any verbosity
+setting.
+
+</P>
+<P>
+Parameter <CODE>workFactor</CODE> controls how the compression phase behaves
+when presented with worst case, highly repetitive, input data.  If
+compression runs into difficulties caused by repetitive data, the
+library switches from the standard sorting algorithm to a fallback
+algorithm.  The fallback is slower than the standard algorithm by
+perhaps a factor of three, but always behaves reasonably, no matter how
+bad the input.
+
+</P>
+<P>
+Lower values of <CODE>workFactor</CODE> reduce the amount of effort the
+standard algorithm will expend before resorting to the fallback.  You
+should set this parameter carefully; too low, and many inputs will be
+handled by the fallback algorithm and so compress rather slowly, too
+high, and your average-to-worst case compression times can become very
+large.  The default value of 30 gives reasonable behaviour over a wide
+range of circumstances.
+
+</P>
+<P>
+Allowable values range from 0 to 250 inclusive.  0 is a special case,
+equivalent to using the default value of 30.
+
+</P>
+<P>
+Note that the compressed output generated is the same regardless of
+whether or not the fallback algorithm is used.
+
+</P>
+<P>
+Be aware also that this parameter may disappear entirely in future
+versions of the library.  In principle it should be possible to devise a
+good way to automatically choose which algorithm to use.  Such a
+mechanism would render the parameter obsolete.
+
+</P>
+<P>
+Possible return values:
+
+<PRE>
+      <CODE>BZ_CONFIG_ERROR</CODE>
+         if the library has been mis-compiled
+      <CODE>BZ_PARAM_ERROR</CODE> 
+         if <CODE>strm</CODE> is <CODE>NULL</CODE> 
+         or <CODE>blockSize</CODE> &#60; 1 or <CODE>blockSize</CODE> &#62; 9
+         or <CODE>verbosity</CODE> &#60; 0 or <CODE>verbosity</CODE> &#62; 4
+         or <CODE>workFactor</CODE> &#60; 0 or <CODE>workFactor</CODE> &#62; 250
+      <CODE>BZ_MEM_ERROR</CODE> 
+         if not enough memory is available
+      <CODE>BZ_OK</CODE> 
+         otherwise
+</PRE>
+
+<P>
+Allowable next actions:
+
+<PRE>
+      <CODE>BZ2_bzCompress</CODE> 
+         if <CODE>BZ_OK</CODE> is returned
+      no specific action needed in case of error
+</PRE>
+
+
+
+<H3><A NAME="SEC20" HREF="manual_toc.html#TOC20"><CODE>BZ2_bzCompress</CODE></A></H3>
+
+<PRE>
+   int BZ2_bzCompress ( bz_stream *strm, int action );
+</PRE>
+
+<P>
+Provides more input and/or output buffer space for the library.  The
+caller maintains input and output buffers, and calls <CODE>BZ2_bzCompress</CODE> to
+transfer data between them.
+
+</P>
+<P>
+Before each call to <CODE>BZ2_bzCompress</CODE>, <CODE>next_in</CODE> should point at
+the data to be compressed, and <CODE>avail_in</CODE> should indicate how many
+bytes the library may read.  <CODE>BZ2_bzCompress</CODE> updates <CODE>next_in</CODE>,
+<CODE>avail_in</CODE> and <CODE>total_in</CODE> to reflect the number of bytes it
+has read.
+
+</P>
+<P>
+Similarly, <CODE>next_out</CODE> should point to a buffer in which the
+compressed data is to be placed, with <CODE>avail_out</CODE> indicating how
+much output space is available.  <CODE>BZ2_bzCompress</CODE> updates
+<CODE>next_out</CODE>, <CODE>avail_out</CODE> and <CODE>total_out</CODE> to reflect the
+number of bytes output.
+
+</P>
+<P>
+You may provide and remove as little or as much data as you like on each
+call of <CODE>BZ2_bzCompress</CODE>.  In the limit, it is acceptable to supply and
+remove data one byte at a time, although this would be terribly
+inefficient.  You should always ensure that at least one byte of output
+space is available at each call.
+
+</P>
+<P>
+A second purpose of <CODE>BZ2_bzCompress</CODE> is to request a change of mode of the
+compressed stream.  
+
+</P>
+<P>
+Conceptually, a compressed stream can be in one of four states: IDLE,
+RUNNING, FLUSHING and FINISHING.  Before initialisation
+(<CODE>BZ2_bzCompressInit</CODE>) and after termination (<CODE>BZ2_bzCompressEnd</CODE>), a
+stream is regarded as IDLE.
+
+</P>
+<P>
+Upon initialisation (<CODE>BZ2_bzCompressInit</CODE>), the stream is placed in the
+RUNNING state.  Subsequent calls to <CODE>BZ2_bzCompress</CODE> should pass
+<CODE>BZ_RUN</CODE> as the requested action; other actions are illegal and
+will result in <CODE>BZ_SEQUENCE_ERROR</CODE>.
+
+</P>
+<P>
+At some point, the calling program will have provided all the input data
+it wants to.  It will then want to finish up -- in effect, asking the
+library to process any data it might have buffered internally.  In this
+state, <CODE>BZ2_bzCompress</CODE> will no longer attempt to read data from
+<CODE>next_in</CODE>, but it will want to write data to <CODE>next_out</CODE>.
+Because the output buffer supplied by the user can be arbitrarily small,
+the finishing-up operation cannot necessarily be done with a single call
+of <CODE>BZ2_bzCompress</CODE>.
+
+</P>
+<P>
+Instead, the calling program passes <CODE>BZ_FINISH</CODE> as an action to
+<CODE>BZ2_bzCompress</CODE>.  This changes the stream's state to FINISHING.  Any
+remaining input (ie, <CODE>next_in[0 .. avail_in-1]</CODE>) is compressed and
+transferred to the output buffer.  To do this, <CODE>BZ2_bzCompress</CODE> must be
+called repeatedly until all the output has been consumed.  At that
+point, <CODE>BZ2_bzCompress</CODE> returns <CODE>BZ_STREAM_END</CODE>, and the stream's
+state is set back to IDLE.  <CODE>BZ2_bzCompressEnd</CODE> should then be
+called.
+
+</P>
+<P>
+Just to make sure the calling program does not cheat, the library makes
+a note of <CODE>avail_in</CODE> at the time of the first call to
+<CODE>BZ2_bzCompress</CODE> which has <CODE>BZ_FINISH</CODE> as an action (ie, at the
+time the program has announced its intention to not supply any more
+input).  By comparing this value with that of <CODE>avail_in</CODE> over
+subsequent calls to <CODE>BZ2_bzCompress</CODE>, the library can detect any
+attempts to slip in more data to compress.  Any calls for which this is
+detected will return <CODE>BZ_SEQUENCE_ERROR</CODE>.  This indicates a
+programming mistake which should be corrected.
+
+</P>
+<P>
+Instead of asking to finish, the calling program may ask
+<CODE>BZ2_bzCompress</CODE> to take all the remaining input, compress it and
+terminate the current (Burrows-Wheeler) compression block.  This could
+be useful for error control purposes.  The mechanism is analogous to
+that for finishing: call <CODE>BZ2_bzCompress</CODE> with an action of
+<CODE>BZ_FLUSH</CODE>, remove output data, and persist with the
+<CODE>BZ_FLUSH</CODE> action until the value <CODE>BZ_RUN</CODE> is returned.  As
+with finishing, <CODE>BZ2_bzCompress</CODE> detects any attempt to provide more
+input data once the flush has begun.
+
+</P>
+<P>
+Once the flush is complete, the stream returns to the normal RUNNING
+state.
+
+</P>
+<P>
+This all sounds pretty complex, but isn't really.  Here's a table
+which shows which actions are allowable in each state, what action
+will be taken, what the next state is, and what the non-error return
+values are.  Note that you can't explicitly ask what state the
+stream is in, but nor do you need to -- it can be inferred from the
+values returned by <CODE>BZ2_bzCompress</CODE>.
+
+<PRE>
+IDLE/<CODE>any</CODE>           
+      Illegal.  IDLE state only exists after <CODE>BZ2_bzCompressEnd</CODE> or
+      before <CODE>BZ2_bzCompressInit</CODE>.
+      Return value = <CODE>BZ_SEQUENCE_ERROR</CODE>
+
+RUNNING/<CODE>BZ_RUN</CODE>     
+      Compress from <CODE>next_in</CODE> to <CODE>next_out</CODE> as much as possible.
+      Next state = RUNNING
+      Return value = <CODE>BZ_RUN_OK</CODE>
+
+RUNNING/<CODE>BZ_FLUSH</CODE>   
+      Remember current value of <CODE>next_in</CODE>.  Compress from <CODE>next_in</CODE>
+      to <CODE>next_out</CODE> as much as possible, but do not accept any more input.  
+      Next state = FLUSHING
+      Return value = <CODE>BZ_FLUSH_OK</CODE>
+
+RUNNING/<CODE>BZ_FINISH</CODE>  
+      Remember current value of <CODE>next_in</CODE>.  Compress from <CODE>next_in</CODE>
+      to <CODE>next_out</CODE> as much as possible, but do not accept any more input.
+      Next state = FINISHING
+      Return value = <CODE>BZ_FINISH_OK</CODE>
+
+FLUSHING/<CODE>BZ_FLUSH</CODE>  
+      Compress from <CODE>next_in</CODE> to <CODE>next_out</CODE> as much as possible, 
+      but do not accept any more input.  
+      If all the existing input has been used up and all compressed
+      output has been removed
+         Next state = RUNNING; Return value = <CODE>BZ_RUN_OK</CODE>
+      else
+         Next state = FLUSHING; Return value = <CODE>BZ_FLUSH_OK</CODE>
+
+FLUSHING/other     
+      Illegal.
+      Return value = <CODE>BZ_SEQUENCE_ERROR</CODE>
+
+FINISHING/<CODE>BZ_FINISH</CODE>  
+      Compress from <CODE>next_in</CODE> to <CODE>next_out</CODE> as much as possible,
+      but to not accept any more input.  
+      If all the existing input has been used up and all compressed
+      output has been removed
+         Next state = IDLE; Return value = <CODE>BZ_STREAM_END</CODE>
+      else
+         Next state = FINISHING; Return value = <CODE>BZ_FINISHING</CODE>
+
+FINISHING/other
+      Illegal.
+      Return value = <CODE>BZ_SEQUENCE_ERROR</CODE>
+</PRE>
+
+<P>
+That still looks complicated?  Well, fair enough.  The usual sequence
+of calls for compressing a load of data is:
+
+<UL>
+<LI>Get started with <CODE>BZ2_bzCompressInit</CODE>.
+
+<LI>Shovel data in and shlurp out its compressed form using zero or more
+
+calls of <CODE>BZ2_bzCompress</CODE> with action = <CODE>BZ_RUN</CODE>.
+<LI>Finish up.
+
+Repeatedly call <CODE>BZ2_bzCompress</CODE> with action = <CODE>BZ_FINISH</CODE>, 
+copying out the compressed output, until <CODE>BZ_STREAM_END</CODE> is returned.
+<LI>Close up and go home.  Call <CODE>BZ2_bzCompressEnd</CODE>.
+
+</UL>
+
+<P>
+If the data you want to compress fits into your input buffer all
+at once, you can skip the calls of <CODE>BZ2_bzCompress ( ..., BZ_RUN )</CODE> and 
+just do the <CODE>BZ2_bzCompress ( ..., BZ_FINISH )</CODE> calls.
+
+</P>
+<P>
+All required memory is allocated by <CODE>BZ2_bzCompressInit</CODE>.  The
+compression library can accept any data at all (obviously).  So you
+shouldn't get any error return values from the <CODE>BZ2_bzCompress</CODE> calls.
+If you do, they will be <CODE>BZ_SEQUENCE_ERROR</CODE>, and indicate a bug in
+your programming.
+
+</P>
+<P>
+Trivial other possible return values:
+
+<PRE>
+      <CODE>BZ_PARAM_ERROR</CODE>   
+         if <CODE>strm</CODE> is <CODE>NULL</CODE>, or <CODE>strm-&#62;s</CODE> is <CODE>NULL</CODE>
+</PRE>
+
+
+
+<H3><A NAME="SEC21" HREF="manual_toc.html#TOC21"><CODE>BZ2_bzCompressEnd</CODE></A></H3>
+
+<PRE>
+int BZ2_bzCompressEnd ( bz_stream *strm );
+</PRE>
+
+<P>
+Releases all memory associated with a compression stream.
+
+</P>
+<P>
+Possible return values:
+
+<PRE>
+   <CODE>BZ_PARAM_ERROR</CODE>    if <CODE>strm</CODE> is <CODE>NULL</CODE> or <CODE>strm-&#62;s</CODE> is <CODE>NULL</CODE>
+   <CODE>BZ_OK</CODE>    otherwise
+</PRE>
+
+
+
+<H3><A NAME="SEC22" HREF="manual_toc.html#TOC22"><CODE>BZ2_bzDecompressInit</CODE></A></H3>
+
+<PRE>
+int BZ2_bzDecompressInit ( bz_stream *strm, int verbosity, int small );
+</PRE>
+
+<P>
+Prepares for decompression.  As with <CODE>BZ2_bzCompressInit</CODE>, a
+<CODE>bz_stream</CODE> record should be allocated and initialised before the
+call.  Fields <CODE>bzalloc</CODE>, <CODE>bzfree</CODE> and <CODE>opaque</CODE> should be
+set if a custom memory allocator is required, or made <CODE>NULL</CODE> for
+the normal <CODE>malloc</CODE>/<CODE>free</CODE> routines.  Upon return, the internal
+state will have been initialised, and <CODE>total_in</CODE> and
+<CODE>total_out</CODE> will be zero.
+
+</P>
+<P>
+For the meaning of parameter <CODE>verbosity</CODE>, see <CODE>BZ2_bzCompressInit</CODE>.
+
+</P>
+<P>
+If <CODE>small</CODE> is nonzero, the library will use an alternative
+decompression algorithm which uses less memory but at the cost of
+decompressing more slowly (roughly speaking, half the speed, but the
+maximum memory requirement drops to around 2300k).  See Chapter 2 for
+more information on memory management.
+
+</P>
+<P>
+Note that the amount of memory needed to decompress
+a stream cannot be determined until the stream's header has been read,
+so even if <CODE>BZ2_bzDecompressInit</CODE> succeeds, a subsequent
+<CODE>BZ2_bzDecompress</CODE> could fail with <CODE>BZ_MEM_ERROR</CODE>.
+
+</P>
+<P>
+Possible return values:
+
+<PRE>
+      <CODE>BZ_CONFIG_ERROR</CODE>
+         if the library has been mis-compiled
+      <CODE>BZ_PARAM_ERROR</CODE>
+         if <CODE>(small != 0 &#38;&#38; small != 1)</CODE>
+         or <CODE>(verbosity &#60; 0 || verbosity &#62; 4)</CODE>
+      <CODE>BZ_MEM_ERROR</CODE>
+         if insufficient memory is available
+</PRE>
+
+<P>
+Allowable next actions:
+
+<PRE>
+      <CODE>BZ2_bzDecompress</CODE>
+         if <CODE>BZ_OK</CODE> was returned
+      no specific action required in case of error
+</PRE>
+
+<P>
+ 
+
+</P>
+
+
+<H3><A NAME="SEC23" HREF="manual_toc.html#TOC23"><CODE>BZ2_bzDecompress</CODE></A></H3>
+
+<PRE>
+int BZ2_bzDecompress ( bz_stream *strm );
+</PRE>
+
+<P>
+Provides more input and/out output buffer space for the library.  The
+caller maintains input and output buffers, and uses <CODE>BZ2_bzDecompress</CODE>
+to transfer data between them.
+
+</P>
+<P>
+Before each call to <CODE>BZ2_bzDecompress</CODE>, <CODE>next_in</CODE> 
+should point at the compressed data,
+and <CODE>avail_in</CODE> should indicate how many bytes the library
+may read.  <CODE>BZ2_bzDecompress</CODE> updates <CODE>next_in</CODE>, <CODE>avail_in</CODE> 
+and <CODE>total_in</CODE>
+to reflect the number of bytes it has read.
+
+</P>
+<P>
+Similarly, <CODE>next_out</CODE> should point to a buffer in which the uncompressed
+output is to be placed, with <CODE>avail_out</CODE> indicating how much output space
+is available.  <CODE>BZ2_bzCompress</CODE> updates <CODE>next_out</CODE>,
+<CODE>avail_out</CODE> and <CODE>total_out</CODE> to reflect
+the number of bytes output.
+
+</P>
+<P>
+You may provide and remove as little or as much data as you like on
+each call of <CODE>BZ2_bzDecompress</CODE>.  
+In the limit, it is acceptable to
+supply and remove data one byte at a time, although this would be
+terribly inefficient.  You should always ensure that at least one
+byte of output space is available at each call.
+
+</P>
+<P>
+Use of <CODE>BZ2_bzDecompress</CODE> is simpler than <CODE>BZ2_bzCompress</CODE>.
+
+</P>
+<P>
+You should provide input and remove output as described above, and
+repeatedly call <CODE>BZ2_bzDecompress</CODE> until <CODE>BZ_STREAM_END</CODE> is
+returned.  Appearance of <CODE>BZ_STREAM_END</CODE> denotes that
+<CODE>BZ2_bzDecompress</CODE> has detected the logical end of the compressed
+stream.  <CODE>BZ2_bzDecompress</CODE> will not produce <CODE>BZ_STREAM_END</CODE> until
+all output data has been placed into the output buffer, so once
+<CODE>BZ_STREAM_END</CODE> appears, you are guaranteed to have available all
+the decompressed output, and <CODE>BZ2_bzDecompressEnd</CODE> can safely be
+called.
+
+</P>
+<P>
+If case of an error return value, you should call <CODE>BZ2_bzDecompressEnd</CODE>
+to clean up and release memory.
+
+</P>
+<P>
+Possible return values:
+
+<PRE>
+      <CODE>BZ_PARAM_ERROR</CODE>
+         if <CODE>strm</CODE> is <CODE>NULL</CODE> or <CODE>strm-&#62;s</CODE> is <CODE>NULL</CODE>
+         or <CODE>strm-&#62;avail_out &#60; 1</CODE>
+      <CODE>BZ_DATA_ERROR</CODE>
+         if a data integrity error is detected in the compressed stream
+      <CODE>BZ_DATA_ERROR_MAGIC</CODE>
+         if the compressed stream doesn't begin with the right magic bytes
+      <CODE>BZ_MEM_ERROR</CODE>
+         if there wasn't enough memory available
+      <CODE>BZ_STREAM_END</CODE>
+         if the logical end of the data stream was detected and all
+         output in has been consumed, eg <CODE>s-&#62;avail_out &#62; 0</CODE>
+      <CODE>BZ_OK</CODE>
+         otherwise
+</PRE>
+
+<P>
+Allowable next actions:
+
+<PRE>
+      <CODE>BZ2_bzDecompress</CODE>
+         if <CODE>BZ_OK</CODE> was returned
+      <CODE>BZ2_bzDecompressEnd</CODE>
+         otherwise
+</PRE>
+
+
+
+<H3><A NAME="SEC24" HREF="manual_toc.html#TOC24"><CODE>BZ2_bzDecompressEnd</CODE></A></H3>
+
+<PRE>
+int BZ2_bzDecompressEnd ( bz_stream *strm );
+</PRE>
+
+<P>
+Releases all memory associated with a decompression stream.
+
+</P>
+<P>
+Possible return values:
+
+<PRE>
+      <CODE>BZ_PARAM_ERROR</CODE>
+         if <CODE>strm</CODE> is <CODE>NULL</CODE> or <CODE>strm-&#62;s</CODE> is <CODE>NULL</CODE>
+      <CODE>BZ_OK</CODE>
+         otherwise
+</PRE>
+
+<P>
+Allowable next actions:
+
+<PRE>
+      None.
+</PRE>
+
+
+
+<H2><A NAME="SEC25" HREF="manual_toc.html#TOC25">High-level interface</A></H2>
+
+<P>
+This interface provides functions for reading and writing 
+<CODE>bzip2</CODE> format files.  First, some general points.
+
+</P>
+
+<UL>
+<LI>All of the functions take an <CODE>int*</CODE> first argument,
+
+  <CODE>bzerror</CODE>.
+  After each call, <CODE>bzerror</CODE> should be consulted first to determine
+  the outcome of the call.  If <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE>, 
+  the call completed
+  successfully, and only then should the return value of the function
+  (if any) be consulted.  If <CODE>bzerror</CODE> is <CODE>BZ_IO_ERROR</CODE>, 
+  there was an error
+  reading/writing the underlying compressed file, and you should
+  then consult <CODE>errno</CODE>/<CODE>perror</CODE> to determine the 
+  cause of the difficulty.
+  <CODE>bzerror</CODE> may also be set to various other values; precise details are
+  given on a per-function basis below.
+<LI>If <CODE>bzerror</CODE> indicates an error
+
+  (ie, anything except <CODE>BZ_OK</CODE> and <CODE>BZ_STREAM_END</CODE>),
+  you should immediately call <CODE>BZ2_bzReadClose</CODE> (or <CODE>BZ2_bzWriteClose</CODE>,
+  depending on whether you are attempting to read or to write)
+  to free up all resources associated
+  with the stream.  Once an error has been indicated, behaviour of all calls
+  except <CODE>BZ2_bzReadClose</CODE> (<CODE>BZ2_bzWriteClose</CODE>) is undefined.  
+  The implication is that (1) <CODE>bzerror</CODE> should
+  be checked after each call, and (2) if <CODE>bzerror</CODE> indicates an error, 
+  <CODE>BZ2_bzReadClose</CODE> (<CODE>BZ2_bzWriteClose</CODE>) should then be called to clean up.
+<LI>The <CODE>FILE*</CODE> arguments passed to
+
+   <CODE>BZ2_bzReadOpen</CODE>/<CODE>BZ2_bzWriteOpen</CODE>  
+  should be set to binary mode.
+  Most Unix systems will do this by default, but other platforms,
+  including Windows and Mac, will not.  If you omit this, you may
+  encounter problems when moving code to new platforms.
+<LI>Memory allocation requests are handled by
+
+  <CODE>malloc</CODE>/<CODE>free</CODE>.  
+  At present
+  there is no facility for user-defined memory allocators in the file I/O
+  functions (could easily be added, though).
+</UL>
+
+
+
+<H3><A NAME="SEC26" HREF="manual_toc.html#TOC26"><CODE>BZ2_bzReadOpen</CODE></A></H3>
+
+<PRE>
+   typedef void BZFILE;
+
+   BZFILE *BZ2_bzReadOpen ( int *bzerror, FILE *f, 
+                            int small, int verbosity,
+                            void *unused, int nUnused );
+</PRE>
+
+<P>
+Prepare to read compressed data from file handle <CODE>f</CODE>.  <CODE>f</CODE>
+should refer to a file which has been opened for reading, and for which
+the error indicator (<CODE>ferror(f)</CODE>)is not set.  If <CODE>small</CODE> is 1,
+the library will try to decompress using less memory, at the expense of
+speed.
+
+</P>
+<P>
+For reasons explained below, <CODE>BZ2_bzRead</CODE> will decompress the
+<CODE>nUnused</CODE> bytes starting at <CODE>unused</CODE>, before starting to read
+from the file <CODE>f</CODE>.  At most <CODE>BZ_MAX_UNUSED</CODE> bytes may be
+supplied like this.  If this facility is not required, you should pass
+<CODE>NULL</CODE> and <CODE>0</CODE> for <CODE>unused</CODE> and n<CODE>Unused</CODE>
+respectively.
+
+</P>
+<P>
+For the meaning of parameters <CODE>small</CODE> and <CODE>verbosity</CODE>,
+see <CODE>BZ2_bzDecompressInit</CODE>.
+
+</P>
+<P>
+The amount of memory needed to decompress a file cannot be determined
+until the file's header has been read.  So it is possible that
+<CODE>BZ2_bzReadOpen</CODE> returns <CODE>BZ_OK</CODE> but a subsequent call of
+<CODE>BZ2_bzRead</CODE> will return <CODE>BZ_MEM_ERROR</CODE>.
+
+</P>
+<P>
+Possible assignments to <CODE>bzerror</CODE>:
+
+<PRE>
+      <CODE>BZ_CONFIG_ERROR</CODE>
+         if the library has been mis-compiled
+      <CODE>BZ_PARAM_ERROR</CODE>
+         if <CODE>f</CODE> is <CODE>NULL</CODE> 
+         or <CODE>small</CODE> is neither <CODE>0</CODE> nor <CODE>1</CODE>                 
+         or <CODE>(unused == NULL &#38;&#38; nUnused != 0)</CODE>
+         or <CODE>(unused != NULL &#38;&#38; !(0 &#60;= nUnused &#60;= BZ_MAX_UNUSED))</CODE>
+      <CODE>BZ_IO_ERROR</CODE>    
+         if <CODE>ferror(f)</CODE> is nonzero
+      <CODE>BZ_MEM_ERROR</CODE>   
+         if insufficient memory is available
+      <CODE>BZ_OK</CODE>
+         otherwise.
+</PRE>
+
+<P>
+Possible return values:
+
+<PRE>
+      Pointer to an abstract <CODE>BZFILE</CODE>        
+         if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE>   
+      <CODE>NULL</CODE>
+         otherwise
+</PRE>
+
+<P>
+Allowable next actions:
+
+<PRE>
+      <CODE>BZ2_bzRead</CODE>
+         if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE>   
+      <CODE>BZ2_bzClose</CODE> 
+         otherwise
+</PRE>
+
+
+
+<H3><A NAME="SEC27" HREF="manual_toc.html#TOC27"><CODE>BZ2_bzRead</CODE></A></H3>
+
+<PRE>
+   int BZ2_bzRead ( int *bzerror, BZFILE *b, void *buf, int len );
+</PRE>
+
+<P>
+Reads up to <CODE>len</CODE> (uncompressed) bytes from the compressed file 
+<CODE>b</CODE> into
+the buffer <CODE>buf</CODE>.  If the read was successful, 
+<CODE>bzerror</CODE> is set to <CODE>BZ_OK</CODE>
+and the number of bytes read is returned.  If the logical end-of-stream
+was detected, <CODE>bzerror</CODE> will be set to <CODE>BZ_STREAM_END</CODE>, 
+and the number
+of bytes read is returned.  All other <CODE>bzerror</CODE> values denote an error.
+
+</P>
+<P>
+<CODE>BZ2_bzRead</CODE> will supply <CODE>len</CODE> bytes,
+unless the logical stream end is detected
+or an error occurs.  Because of this, it is possible to detect the 
+stream end by observing when the number of bytes returned is 
+less than the number
+requested.  Nevertheless, this is regarded as inadvisable; you should
+instead check <CODE>bzerror</CODE> after every call and watch out for
+<CODE>BZ_STREAM_END</CODE>.
+
+</P>
+<P>
+Internally, <CODE>BZ2_bzRead</CODE> copies data from the compressed file in chunks
+of size <CODE>BZ_MAX_UNUSED</CODE> bytes
+before decompressing it.  If the file contains more bytes than strictly
+needed to reach the logical end-of-stream, <CODE>BZ2_bzRead</CODE> will almost certainly
+read some of the trailing data before signalling <CODE>BZ_SEQUENCE_END</CODE>.
+To collect the read but unused data once <CODE>BZ_SEQUENCE_END</CODE> has 
+appeared, call <CODE>BZ2_bzReadGetUnused</CODE> immediately before <CODE>BZ2_bzReadClose</CODE>.
+
+</P>
+<P>
+Possible assignments to <CODE>bzerror</CODE>:
+
+<PRE>
+      <CODE>BZ_PARAM_ERROR</CODE>
+         if <CODE>b</CODE> is <CODE>NULL</CODE> or <CODE>buf</CODE> is <CODE>NULL</CODE> or <CODE>len &#60; 0</CODE>
+      <CODE>BZ_SEQUENCE_ERROR</CODE> 
+         if <CODE>b</CODE> was opened with <CODE>BZ2_bzWriteOpen</CODE>
+      <CODE>BZ_IO_ERROR</CODE> 
+         if there is an error reading from the compressed file
+      <CODE>BZ_UNEXPECTED_EOF</CODE> 
+         if the compressed file ended before the logical end-of-stream was detected
+      <CODE>BZ_DATA_ERROR</CODE> 
+         if a data integrity error was detected in the compressed stream
+      <CODE>BZ_DATA_ERROR_MAGIC</CODE>
+         if the stream does not begin with the requisite header bytes (ie, is not 
+         a <CODE>bzip2</CODE> data file).  This is really a special case of <CODE>BZ_DATA_ERROR</CODE>.
+      <CODE>BZ_MEM_ERROR</CODE> 
+         if insufficient memory was available
+      <CODE>BZ_STREAM_END</CODE> 
+         if the logical end of stream was detected.
+      <CODE>BZ_OK</CODE>
+         otherwise.
+</PRE>
+
+<P>
+Possible return values:
+
+<PRE>
+      number of bytes read
+         if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE> or <CODE>BZ_STREAM_END</CODE>
+      undefined
+         otherwise
+</PRE>
+
+<P>
+Allowable next actions:
+
+<PRE>
+      collect data from <CODE>buf</CODE>, then <CODE>BZ2_bzRead</CODE> or <CODE>BZ2_bzReadClose</CODE>
+         if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE> 
+      collect data from <CODE>buf</CODE>, then <CODE>BZ2_bzReadClose</CODE> or <CODE>BZ2_bzReadGetUnused</CODE> 
+         if <CODE>bzerror</CODE> is <CODE>BZ_SEQUENCE_END</CODE>   
+      <CODE>BZ2_bzReadClose</CODE> 
+         otherwise
+</PRE>
+
+
+
+<H3><A NAME="SEC28" HREF="manual_toc.html#TOC28"><CODE>BZ2_bzReadGetUnused</CODE></A></H3>
+
+<PRE>
+   void BZ2_bzReadGetUnused ( int* bzerror, BZFILE *b, 
+                              void** unused, int* nUnused );
+</PRE>
+
+<P>
+Returns data which was read from the compressed file but was not needed
+to get to the logical end-of-stream.  <CODE>*unused</CODE> is set to the address
+of the data, and <CODE>*nUnused</CODE> to the number of bytes.  <CODE>*nUnused</CODE> will
+be set to a value between <CODE>0</CODE> and <CODE>BZ_MAX_UNUSED</CODE> inclusive.
+
+</P>
+<P>
+This function may only be called once <CODE>BZ2_bzRead</CODE> has signalled 
+<CODE>BZ_STREAM_END</CODE> but before <CODE>BZ2_bzReadClose</CODE>.
+
+</P>
+<P>
+Possible assignments to <CODE>bzerror</CODE>:
+
+<PRE>
+      <CODE>BZ_PARAM_ERROR</CODE> 
+         if <CODE>b</CODE> is <CODE>NULL</CODE> 
+         or <CODE>unused</CODE> is <CODE>NULL</CODE> or <CODE>nUnused</CODE> is <CODE>NULL</CODE>
+      <CODE>BZ_SEQUENCE_ERROR</CODE> 
+         if <CODE>BZ_STREAM_END</CODE> has not been signalled
+         or if <CODE>b</CODE> was opened with <CODE>BZ2_bzWriteOpen</CODE>
+     <CODE>BZ_OK</CODE>
+         otherwise
+</PRE>
+
+<P>
+Allowable next actions:
+
+<PRE>
+      <CODE>BZ2_bzReadClose</CODE>
+</PRE>
+
+
+
+<H3><A NAME="SEC29" HREF="manual_toc.html#TOC29"><CODE>BZ2_bzReadClose</CODE></A></H3>
+
+<PRE>
+   void BZ2_bzReadClose ( int *bzerror, BZFILE *b );
+</PRE>
+
+<P>
+Releases all memory pertaining to the compressed file <CODE>b</CODE>.  
+<CODE>BZ2_bzReadClose</CODE> does not call <CODE>fclose</CODE> on the underlying file
+handle, so you should do that yourself if appropriate.
+<CODE>BZ2_bzReadClose</CODE> should be called to clean up after all error
+situations.
+
+</P>
+<P>
+Possible assignments to <CODE>bzerror</CODE>:
+
+<PRE>
+      <CODE>BZ_SEQUENCE_ERROR</CODE> 
+         if <CODE>b</CODE> was opened with <CODE>BZ2_bzOpenWrite</CODE> 
+      <CODE>BZ_OK</CODE> 
+         otherwise
+</PRE>
+
+<P>
+Allowable next actions:
+
+<PRE>
+      none
+</PRE>
+
+
+
+<H3><A NAME="SEC30" HREF="manual_toc.html#TOC30"><CODE>BZ2_bzWriteOpen</CODE></A></H3>
+
+<PRE>
+   BZFILE *BZ2_bzWriteOpen ( int *bzerror, FILE *f, 
+                             int blockSize100k, int verbosity,
+                             int workFactor );
+</PRE>
+
+<P>
+Prepare to write compressed data to file handle <CODE>f</CODE>.  
+<CODE>f</CODE> should refer to
+a file which has been opened for writing, and for which the error
+indicator (<CODE>ferror(f)</CODE>)is not set.  
+
+</P>
+<P>
+For the meaning of parameters <CODE>blockSize100k</CODE>,
+<CODE>verbosity</CODE> and <CODE>workFactor</CODE>, see
+<BR> <CODE>BZ2_bzCompressInit</CODE>.
+
+</P>
+<P>
+All required memory is allocated at this stage, so if the call
+completes successfully, <CODE>BZ_MEM_ERROR</CODE> cannot be signalled by a
+subsequent call to <CODE>BZ2_bzWrite</CODE>.
+
+</P>
+<P>
+Possible assignments to <CODE>bzerror</CODE>:
+
+<PRE>
+      <CODE>BZ_CONFIG_ERROR</CODE>
+         if the library has been mis-compiled
+      <CODE>BZ_PARAM_ERROR</CODE> 
+         if <CODE>f</CODE> is <CODE>NULL</CODE> 
+         or <CODE>blockSize100k &#60; 1</CODE> or <CODE>blockSize100k &#62; 9</CODE>
+      <CODE>BZ_IO_ERROR</CODE> 
+         if <CODE>ferror(f)</CODE> is nonzero
+      <CODE>BZ_MEM_ERROR</CODE> 
+         if insufficient memory is available
+      <CODE>BZ_OK</CODE> 
+         otherwise
+</PRE>
+
+<P>
+Possible return values:
+
+<PRE>
+      Pointer to an abstract <CODE>BZFILE</CODE>  
+         if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE>   
+      <CODE>NULL</CODE> 
+         otherwise
+</PRE>
+
+<P>
+Allowable next actions:
+
+<PRE>
+      <CODE>BZ2_bzWrite</CODE> 
+         if <CODE>bzerror</CODE> is <CODE>BZ_OK</CODE> 
+         (you could go directly to <CODE>BZ2_bzWriteClose</CODE>, but this would be pretty pointless)
+      <CODE>BZ2_bzWriteClose</CODE> 
+         otherwise
+</PRE>
+
+
+
+<H3><A NAME="SEC31" HREF="manual_toc.html#TOC31"><CODE>BZ2_bzWrite</CODE></A></H3>
+
+<PRE>
+   void BZ2_bzWrite ( int *bzerror, BZFILE *b, void *buf, int len );
+</PRE>
+
+<P>
+Absorbs <CODE>len</CODE> bytes from the buffer <CODE>buf</CODE>, eventually to be
+compressed and written to the file.
+
+</P>
+<P>
+Possible assignments to <CODE>bzerror</CODE>:
+
+<PRE>
+      <CODE>BZ_PARAM_ERROR</CODE> 
+         if <CODE>b</CODE> is <CODE>NULL</CODE> or <CODE>buf</CODE> is <CODE>NULL</CODE> or <CODE>len &#60; 0</CODE>
+      <CODE>BZ_SEQUENCE_ERROR</CODE> 
+         if b was opened with <CODE>BZ2_bzReadOpen</CODE>
+      <CODE>BZ_IO_ERROR</CODE> 
+         if there is an error writing the compressed file.
+      <CODE>BZ_OK</CODE> 
+         otherwise
+</PRE>
+
+
+
+<H3><A NAME="SEC32" HREF="manual_toc.html#TOC32"><CODE>BZ2_bzWriteClose</CODE></A></H3>
+
+<PRE>
+   void BZ2_bzWriteClose ( int *bzerror, BZFILE* f,
+                           int abandon,
+                           unsigned int* nbytes_in,
+                           unsigned int* nbytes_out );
+
+   void BZ2_bzWriteClose64 ( int *bzerror, BZFILE* f,
+                             int abandon,
+                             unsigned int* nbytes_in_lo32,
+                             unsigned int* nbytes_in_hi32,
+                             unsigned int* nbytes_out_lo32,
+                             unsigned int* nbytes_out_hi32 );
+</PRE>
+
+<P>
+Compresses and flushes to the compressed file all data so far supplied
+by <CODE>BZ2_bzWrite</CODE>.  The logical end-of-stream markers are also written, so
+subsequent calls to <CODE>BZ2_bzWrite</CODE> are illegal.  All memory associated 
+with the compressed file <CODE>b</CODE> is released.  
+<CODE>fflush</CODE> is called on the
+compressed file, but it is not <CODE>fclose</CODE>'d.
+
+</P>
+<P>
+If <CODE>BZ2_bzWriteClose</CODE> is called to clean up after an error, the only
+action is to release the memory.  The library records the error codes
+issued by previous calls, so this situation will be detected
+automatically.  There is no attempt to complete the compression
+operation, nor to <CODE>fflush</CODE> the compressed file.  You can force this
+behaviour to happen even in the case of no error, by passing a nonzero
+value to <CODE>abandon</CODE>.
+
+</P>
+<P>
+If <CODE>nbytes_in</CODE> is non-null, <CODE>*nbytes_in</CODE> will be set to be the
+total volume of uncompressed data handled.  Similarly, <CODE>nbytes_out</CODE>
+will be set to the total volume of compressed data written.  For 
+compatibility with older versions of the library, <CODE>BZ2_bzWriteClose</CODE>
+only yields the lower 32 bits of these counts.  Use
+<CODE>BZ2_bzWriteClose64</CODE> if you want the full 64 bit counts.  These
+two functions are otherwise absolutely identical.
+
+</P>
+
+<P>
+Possible assignments to <CODE>bzerror</CODE>:
+
+<PRE>
+      <CODE>BZ_SEQUENCE_ERROR</CODE> 
+         if <CODE>b</CODE> was opened with <CODE>BZ2_bzReadOpen</CODE>
+      <CODE>BZ_IO_ERROR</CODE> 
+         if there is an error writing the compressed file
+      <CODE>BZ_OK</CODE> 
+         otherwise
+</PRE>
+
+
+
+<H3><A NAME="SEC33" HREF="manual_toc.html#TOC33">Handling embedded compressed data streams</A></H3>
+
+<P>
+The high-level library facilitates use of
+<CODE>bzip2</CODE> data streams which form some part of a surrounding, larger
+data stream.
+
+<UL>
+<LI>For writing, the library takes an open file handle, writes
+
+compressed data to it, <CODE>fflush</CODE>es it but does not <CODE>fclose</CODE> it.
+The calling application can write its own data before and after the
+compressed data stream, using that same file handle.
+<LI>Reading is more complex, and the facilities are not as general
+
+as they could be since generality is hard to reconcile with efficiency.
+<CODE>BZ2_bzRead</CODE> reads from the compressed file in blocks of size
+<CODE>BZ_MAX_UNUSED</CODE> bytes, and in doing so probably will overshoot
+the logical end of compressed stream.
+To recover this data once decompression has
+ended, call <CODE>BZ2_bzReadGetUnused</CODE> after the last call of <CODE>BZ2_bzRead</CODE>
+(the one returning <CODE>BZ_STREAM_END</CODE>) but before calling
+<CODE>BZ2_bzReadClose</CODE>.
+</UL>
+
+<P>
+This mechanism makes it easy to decompress multiple <CODE>bzip2</CODE>
+streams placed end-to-end.  As the end of one stream, when <CODE>BZ2_bzRead</CODE>
+returns <CODE>BZ_STREAM_END</CODE>, call <CODE>BZ2_bzReadGetUnused</CODE> to collect the
+unused data (copy it into your own buffer somewhere).  
+That data forms the start of the next compressed stream.
+To start uncompressing that next stream, call <CODE>BZ2_bzReadOpen</CODE> again,
+feeding in the unused data via the <CODE>unused</CODE>/<CODE>nUnused</CODE>
+parameters.
+Keep doing this until <CODE>BZ_STREAM_END</CODE> return coincides with the
+physical end of file (<CODE>feof(f)</CODE>).  In this situation
+<CODE>BZ2_bzReadGetUnused</CODE>
+will of course return no data.
+
+</P>
+<P>
+This should give some feel for how the high-level interface can be used.
+If you require extra flexibility, you'll have to bite the bullet and get
+to grips with the low-level interface.
+
+</P>
+
+
+<H3><A NAME="SEC34" HREF="manual_toc.html#TOC34">Standard file-reading/writing code</A></H3>
+<P>
+Here's how you'd write data to a compressed file:
+
+<PRE>
+FILE*   f;
+BZFILE* b;
+int     nBuf;
+char    buf[ /* whatever size you like */ ];
+int     bzerror;
+int     nWritten;
+
+f = fopen ( "myfile.bz2", "w" );
+if (!f) {
+   /* handle error */
+}
+b = BZ2_bzWriteOpen ( &#38;bzerror, f, 9 );
+if (bzerror != BZ_OK) {
+   BZ2_bzWriteClose ( b );
+   /* handle error */
+}
+
+while ( /* condition */ ) {
+   /* get data to write into buf, and set nBuf appropriately */
+   nWritten = BZ2_bzWrite ( &#38;bzerror, b, buf, nBuf );
+   if (bzerror == BZ_IO_ERROR) { 
+      BZ2_bzWriteClose ( &#38;bzerror, b );
+      /* handle error */
+   }
+}
+
+BZ2_bzWriteClose ( &#38;bzerror, b );
+if (bzerror == BZ_IO_ERROR) {
+   /* handle error */
+}
+</PRE>
+
+<P>
+And to read from a compressed file:
+
+<PRE>
+FILE*   f;
+BZFILE* b;
+int     nBuf;
+char    buf[ /* whatever size you like */ ];
+int     bzerror;
+int     nWritten;
+
+f = fopen ( "myfile.bz2", "r" );
+if (!f) {
+   /* handle error */
+}
+b = BZ2_bzReadOpen ( &#38;bzerror, f, 0, NULL, 0 );
+if (bzerror != BZ_OK) {
+   BZ2_bzReadClose ( &#38;bzerror, b );
+   /* handle error */
+}
+
+bzerror = BZ_OK;
+while (bzerror == BZ_OK &#38;&#38; /* arbitrary other conditions */) {
+   nBuf = BZ2_bzRead ( &#38;bzerror, b, buf, /* size of buf */ );
+   if (bzerror == BZ_OK) {
+      /* do something with buf[0 .. nBuf-1] */
+   }
+}
+if (bzerror != BZ_STREAM_END) {
+   BZ2_bzReadClose ( &#38;bzerror, b );
+   /* handle error */
+} else {
+   BZ2_bzReadClose ( &#38;bzerror );
+}
+</PRE>
+
+
+
+<H2><A NAME="SEC35" HREF="manual_toc.html#TOC35">Utility functions</A></H2>
+
+
+<H3><A NAME="SEC36" HREF="manual_toc.html#TOC36"><CODE>BZ2_bzBuffToBuffCompress</CODE></A></H3>
+
+<PRE>
+   int BZ2_bzBuffToBuffCompress( char*         dest,
+                                 unsigned int* destLen,
+                                 char*         source,
+                                 unsigned int  sourceLen,
+                                 int           blockSize100k,
+                                 int           verbosity,
+                                 int           workFactor );
+</PRE>
+
+<P>
+Attempts to compress the data in <CODE>source[0 .. sourceLen-1]</CODE>
+into the destination buffer, <CODE>dest[0 .. *destLen-1]</CODE>.
+If the destination buffer is big enough, <CODE>*destLen</CODE> is
+set to the size of the compressed data, and <CODE>BZ_OK</CODE> is
+returned.  If the compressed data won't fit, <CODE>*destLen</CODE>
+is unchanged, and <CODE>BZ_OUTBUFF_FULL</CODE> is returned.
+
+</P>
+<P>
+Compression in this manner is a one-shot event, done with a single call
+to this function.  The resulting compressed data is a complete
+<CODE>bzip2</CODE> format data stream.  There is no mechanism for making
+additional calls to provide extra input data.  If you want that kind of
+mechanism, use the low-level interface.
+
+</P>
+<P>
+For the meaning of parameters <CODE>blockSize100k</CODE>, <CODE>verbosity</CODE>
+and <CODE>workFactor</CODE>, <BR> see <CODE>BZ2_bzCompressInit</CODE>.
+
+</P>
+<P>
+To guarantee that the compressed data will fit in its buffer, allocate
+an output buffer of size 1% larger than the uncompressed data, plus
+six hundred extra bytes.
+
+</P>
+<P>
+<CODE>BZ2_bzBuffToBuffDecompress</CODE> will not write data at or
+beyond <CODE>dest[*destLen]</CODE>, even in case of buffer overflow.
+
+</P>
+<P>
+Possible return values:
+
+<PRE>
+      <CODE>BZ_CONFIG_ERROR</CODE>
+         if the library has been mis-compiled
+      <CODE>BZ_PARAM_ERROR</CODE> 
+         if <CODE>dest</CODE> is <CODE>NULL</CODE> or <CODE>destLen</CODE> is <CODE>NULL</CODE>
+         or <CODE>blockSize100k &#60; 1</CODE> or <CODE>blockSize100k &#62; 9</CODE>
+         or <CODE>verbosity &#60; 0</CODE> or <CODE>verbosity &#62; 4</CODE> 
+         or <CODE>workFactor &#60; 0</CODE> or <CODE>workFactor &#62; 250</CODE>
+      <CODE>BZ_MEM_ERROR</CODE>
+         if insufficient memory is available 
+      <CODE>BZ_OUTBUFF_FULL</CODE>
+         if the size of the compressed data exceeds <CODE>*destLen</CODE>
+      <CODE>BZ_OK</CODE> 
+         otherwise
+</PRE>
+
+
+
+<H3><A NAME="SEC37" HREF="manual_toc.html#TOC37"><CODE>BZ2_bzBuffToBuffDecompress</CODE></A></H3>
+
+<PRE>
+   int BZ2_bzBuffToBuffDecompress ( char*         dest,
+                                    unsigned int* destLen,
+                                    char*         source,
+                                    unsigned int  sourceLen,
+                                    int           small,
+                                    int           verbosity );
+</PRE>
+
+<P>
+Attempts to decompress the data in <CODE>source[0 .. sourceLen-1]</CODE>
+into the destination buffer, <CODE>dest[0 .. *destLen-1]</CODE>.
+If the destination buffer is big enough, <CODE>*destLen</CODE> is
+set to the size of the uncompressed data, and <CODE>BZ_OK</CODE> is
+returned.  If the compressed data won't fit, <CODE>*destLen</CODE>
+is unchanged, and <CODE>BZ_OUTBUFF_FULL</CODE> is returned.
+
+</P>
+<P>
+<CODE>source</CODE> is assumed to hold a complete <CODE>bzip2</CODE> format
+data stream.  <BR> <CODE>BZ2_bzBuffToBuffDecompress</CODE> tries to decompress
+the entirety of the stream into the output buffer.
+
+</P>
+<P>
+For the meaning of parameters <CODE>small</CODE> and <CODE>verbosity</CODE>,
+see <CODE>BZ2_bzDecompressInit</CODE>.
+
+</P>
+<P>
+Because the compression ratio of the compressed data cannot be known in
+advance, there is no easy way to guarantee that the output buffer will
+be big enough.  You may of course make arrangements in your code to
+record the size of the uncompressed data, but such a mechanism is beyond
+the scope of this library.
+
+</P>
+<P>
+<CODE>BZ2_bzBuffToBuffDecompress</CODE> will not write data at or
+beyond <CODE>dest[*destLen]</CODE>, even in case of buffer overflow.
+
+</P>
+<P>
+Possible return values:
+
+<PRE>
+      <CODE>BZ_CONFIG_ERROR</CODE>
+         if the library has been mis-compiled
+      <CODE>BZ_PARAM_ERROR</CODE> 
+         if <CODE>dest</CODE> is <CODE>NULL</CODE> or <CODE>destLen</CODE> is <CODE>NULL</CODE>
+         or <CODE>small != 0 &#38;&#38; small != 1</CODE>
+         or <CODE>verbosity &#60; 0</CODE> or <CODE>verbosity &#62; 4</CODE> 
+      <CODE>BZ_MEM_ERROR</CODE>
+         if insufficient memory is available 
+      <CODE>BZ_OUTBUFF_FULL</CODE>
+         if the size of the compressed data exceeds <CODE>*destLen</CODE>
+      <CODE>BZ_DATA_ERROR</CODE>
+         if a data integrity error was detected in the compressed data
+      <CODE>BZ_DATA_ERROR_MAGIC</CODE>
+         if the compressed data doesn't begin with the right magic bytes
+      <CODE>BZ_UNEXPECTED_EOF</CODE>
+         if the compressed data ends unexpectedly
+      <CODE>BZ_OK</CODE> 
+         otherwise
+</PRE>
+
+
+
+<H2><A NAME="SEC38" HREF="manual_toc.html#TOC38"><CODE>zlib</CODE> compatibility functions</A></H2>
+<P>
+Yoshioka Tsuneo has contributed some functions to
+give better <CODE>zlib</CODE> compatibility.  These functions are
+<CODE>BZ2_bzopen</CODE>, <CODE>BZ2_bzread</CODE>, <CODE>BZ2_bzwrite</CODE>, <CODE>BZ2_bzflush</CODE>,
+<CODE>BZ2_bzclose</CODE>,
+<CODE>BZ2_bzerror</CODE> and <CODE>BZ2_bzlibVersion</CODE>.
+These functions are not (yet) officially part of
+the library.  If they break, you get to keep all the pieces.
+Nevertheless, I think they work ok.
+
+<PRE>
+typedef void BZFILE;
+
+const char * BZ2_bzlibVersion ( void );
+</PRE>
+
+<P>
+Returns a string indicating the library version.
+
+<PRE>
+BZFILE * BZ2_bzopen  ( const char *path, const char *mode );
+BZFILE * BZ2_bzdopen ( int        fd,    const char *mode );
+</PRE>
+
+<P>
+Opens a <CODE>.bz2</CODE> file for reading or writing, using either its name
+or a pre-existing file descriptor. 
+Analogous to <CODE>fopen</CODE> and <CODE>fdopen</CODE>.
+
+<PRE>
+int BZ2_bzread  ( BZFILE* b, void* buf, int len );
+int BZ2_bzwrite ( BZFILE* b, void* buf, int len );
+</PRE>
+
+<P>
+Reads/writes data from/to a previously opened <CODE>BZFILE</CODE>.
+Analogous to <CODE>fread</CODE> and <CODE>fwrite</CODE>.
+
+<PRE>
+int  BZ2_bzflush ( BZFILE* b );
+void BZ2_bzclose ( BZFILE* b );
+</PRE>
+
+<P>
+Flushes/closes a <CODE>BZFILE</CODE>.  <CODE>BZ2_bzflush</CODE> doesn't actually do
+anything.  Analogous to <CODE>fflush</CODE> and <CODE>fclose</CODE>.
+
+</P>
+
+<PRE>
+const char * BZ2_bzerror ( BZFILE *b, int *errnum )
+</PRE>
+
+<P>
+Returns a string describing the more recent error status of
+<CODE>b</CODE>, and also sets <CODE>*errnum</CODE> to its numerical value.
+
+</P>
+
+
+
+<H2><A NAME="SEC39" HREF="manual_toc.html#TOC39">Using the library in a <CODE>stdio</CODE>-free environment</A></H2>
+
+
+
+<H3><A NAME="SEC40" HREF="manual_toc.html#TOC40">Getting rid of <CODE>stdio</CODE></A></H3>
+
+<P>
+In a deeply embedded application, you might want to use just
+the memory-to-memory functions.  You can do this conveniently
+by compiling the library with preprocessor symbol <CODE>BZ_NO_STDIO</CODE>
+defined.  Doing this gives you a library containing only the following
+eight functions:
+
+</P>
+<P>
+<CODE>BZ2_bzCompressInit</CODE>, <CODE>BZ2_bzCompress</CODE>, <CODE>BZ2_bzCompressEnd</CODE> <BR>
+<CODE>BZ2_bzDecompressInit</CODE>, <CODE>BZ2_bzDecompress</CODE>, <CODE>BZ2_bzDecompressEnd</CODE> <BR>
+<CODE>BZ2_bzBuffToBuffCompress</CODE>, <CODE>BZ2_bzBuffToBuffDecompress</CODE>
+
+</P>
+<P>
+When compiled like this, all functions will ignore <CODE>verbosity</CODE>
+settings.
+
+</P>
+
+
+<H3><A NAME="SEC41" HREF="manual_toc.html#TOC41">Critical error handling</A></H3>
+<P>
+<CODE>libbzip2</CODE> contains a number of internal assertion checks which
+should, needless to say, never be activated.  Nevertheless, if an
+assertion should fail, behaviour depends on whether or not the library
+was compiled with <CODE>BZ_NO_STDIO</CODE> set.
+
+</P>
+<P>
+For a normal compile, an assertion failure yields the message
+
+<PRE>
+   bzip2/libbzip2: internal error number N.
+   This is a bug in bzip2/libbzip2, 1.0 of 21-Mar-2000.
+   Please report it to me at: jseward@acm.org.  If this happened
+   when you were using some program which uses libbzip2 as a
+   component, you should also report this bug to the author(s)
+   of that program.  Please make an effort to report this bug;
+   timely and accurate bug reports eventually lead to higher
+   quality software.  Thanks.  Julian Seward, 21 March 2000.
+</PRE>
+
+<P>
+where <CODE>N</CODE> is some error code number.  <CODE>exit(3)</CODE>
+is then called.
+
+</P>
+<P>
+For a <CODE>stdio</CODE>-free library, assertion failures result
+in a call to a function declared as:
+
+<PRE>
+   extern void bz_internal_error ( int errcode );
+</PRE>
+
+<P>
+The relevant code is passed as a parameter.  You should supply
+such a function.
+
+</P>
+<P>
+In either case, once an assertion failure has occurred, any 
+<CODE>bz_stream</CODE> records involved can be regarded as invalid.
+You should not attempt to resume normal operation with them.
+
+</P>
+<P>
+You may, of course, change critical error handling to suit
+your needs.  As I said above, critical errors indicate bugs
+in the library and should not occur.  All "normal" error
+situations are indicated via error return codes from functions,
+and can be recovered from.
+
+</P>
+
+
+
+<H2><A NAME="SEC42" HREF="manual_toc.html#TOC42">Making a Windows DLL</A></H2>
+<P>
+Everything related to Windows has been contributed by Yoshioka Tsuneo
+<BR> (<CODE>QWF00133@niftyserve.or.jp</CODE> /
+<CODE>tsuneo-y@is.aist-nara.ac.jp</CODE>), so you should send your queries to
+him (but perhaps Cc: me, <CODE>jseward@acm.org</CODE>).
+
+</P>
+<P>
+My vague understanding of what to do is: using Visual C++ 5.0,
+open the project file <CODE>libbz2.dsp</CODE>, and build.  That's all.
+
+</P>
+<P>
+If you can't
+open the project file for some reason, make a new one, naming these files:
+<CODE>blocksort.c</CODE>, <CODE>bzlib.c</CODE>, <CODE>compress.c</CODE>, 
+<CODE>crctable.c</CODE>, <CODE>decompress.c</CODE>, <CODE>huffman.c</CODE>, <BR>
+<CODE>randtable.c</CODE> and <CODE>libbz2.def</CODE>.  You will also need
+to name the header files <CODE>bzlib.h</CODE> and <CODE>bzlib_private.h</CODE>.
+
+</P>
+<P>
+If you don't use VC++, you may need to define the proprocessor symbol
+<CODE>_WIN32</CODE>. 
+
+</P>
+<P>
+Finally, <CODE>dlltest.c</CODE> is a sample program using the DLL.  It has a
+project file, <CODE>dlltest.dsp</CODE>.
+
+</P>
+<P>
+If you just want a makefile for Visual C, have a look at
+<CODE>makefile.msc</CODE>.
+
+</P>
+<P>
+Be aware that if you compile <CODE>bzip2</CODE> itself on Win32, you must set
+<CODE>BZ_UNIX</CODE> to 0 and <CODE>BZ_LCCWIN32</CODE> to 1, in the file
+<CODE>bzip2.c</CODE>, before compiling.  Otherwise the resulting binary won't
+work correctly.
+
+</P>
+<P>
+I haven't tried any of this stuff myself, but it all looks plausible.
+
+</P>
+
+<P><HR><P>
+<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_2.html">previous</A>, <A HREF="manual_4.html">next</A>, <A HREF="manual_4.html">last</A> section, <A HREF="manual_toc.html">table of contents</A>.
+</BODY>
+</HTML>
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+<HTML>
+<HEAD>
+<!-- This HTML file has been created by texi2html 1.54
+     from manual.texi on 23 March 2000 -->
+
+<TITLE>bzip2 and libbzip2 - Miscellanea</TITLE>
+<link href="manual_3.html" rel=Previous>
+<link href="manual_toc.html" rel=ToC>
+
+</HEAD>
+<BODY>
+<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_3.html">previous</A>, next, last section, <A HREF="manual_toc.html">table of contents</A>.
+<P><HR><P>
+
+
+<H1><A NAME="SEC43" HREF="manual_toc.html#TOC43">Miscellanea</A></H1>
+
+<P>
+These are just some random thoughts of mine.  Your mileage may
+vary.
+
+</P>
+
+
+<H2><A NAME="SEC44" HREF="manual_toc.html#TOC44">Limitations of the compressed file format</A></H2>
+<P>
+<CODE>bzip2-1.0</CODE>, <CODE>0.9.5</CODE> and <CODE>0.9.0</CODE>
+use exactly the same file format as the previous
+version, <CODE>bzip2-0.1</CODE>.  This decision was made in the interests of
+stability.  Creating yet another incompatible compressed file format
+would create further confusion and disruption for users.
+
+</P>
+<P>
+Nevertheless, this is not a painless decision.  Development
+work since the release of <CODE>bzip2-0.1</CODE> in August 1997
+has shown complexities in the file format which slow down
+decompression and, in retrospect, are unnecessary.  These are:
+
+<UL>
+<LI>The run-length encoder, which is the first of the
+
+      compression transformations, is entirely irrelevant.
+      The original purpose was to protect the sorting algorithm
+      from the very worst case input: a string of repeated
+      symbols.  But algorithm steps Q6a and Q6b in the original
+      Burrows-Wheeler technical report (SRC-124) show how
+      repeats can be handled without difficulty in block
+      sorting.
+<LI>The randomisation mechanism doesn't really need to be
+
+      there.  Udi Manber and Gene Myers published a suffix
+      array construction algorithm a few years back, which
+      can be employed to sort any block, no matter how 
+      repetitive, in O(N log N) time.  Subsequent work by
+      Kunihiko Sadakane has produced a derivative O(N (log N)^2) 
+      algorithm which usually outperforms the Manber-Myers
+      algorithm.
+
+      I could have changed to Sadakane's algorithm, but I find
+      it to be slower than <CODE>bzip2</CODE>'s existing algorithm for
+      most inputs, and the randomisation mechanism protects
+      adequately against bad cases.  I didn't think it was
+      a good tradeoff to make.  Partly this is due to the fact
+      that I was not flooded with email complaints about
+      <CODE>bzip2-0.1</CODE>'s performance on repetitive data, so
+      perhaps it isn't a problem for real inputs.
+
+      Probably the best long-term solution,
+      and the one I have incorporated into 0.9.5 and above,
+      is to use the existing sorting
+      algorithm initially, and fall back to a O(N (log N)^2)
+      algorithm if the standard algorithm gets into difficulties.
+<LI>The compressed file format was never designed to be
+
+      handled by a library, and I have had to jump though
+      some hoops to produce an efficient implementation of
+      decompression.  It's a bit hairy.  Try passing
+      <CODE>decompress.c</CODE> through the C preprocessor 
+      and you'll see what I mean.  Much of this complexity
+      could have been avoided if the compressed size of
+      each block of data was recorded in the data stream.
+<LI>An Adler-32 checksum, rather than a CRC32 checksum,
+
+      would be faster to compute.
+</UL>
+
+<P>
+It would be fair to say that the <CODE>bzip2</CODE> format was frozen
+before I properly and fully understood the performance
+consequences of doing so.
+
+</P>
+<P>
+Improvements which I was able to incorporate into
+0.9.0, despite using the same file format, are:
+
+<UL>
+<LI>Single array implementation of the inverse BWT.  This
+
+      significantly speeds up decompression, presumably
+      because it reduces the number of cache misses.
+<LI>Faster inverse MTF transform for large MTF values.  The
+
+      new implementation is based on the notion of sliding blocks
+      of values.
+<LI><CODE>bzip2-0.9.0</CODE> now reads and writes files with <CODE>fread</CODE>
+
+      and <CODE>fwrite</CODE>; version 0.1 used <CODE>putc</CODE> and <CODE>getc</CODE>.
+      Duh!  Well, you live and learn.
+
+</UL>
+
+<P>
+Further ahead, it would be nice 
+to be able to do random access into files.  This will 
+require some careful design of compressed file formats.
+
+</P>
+
+
+
+<H2><A NAME="SEC45" HREF="manual_toc.html#TOC45">Portability issues</A></H2>
+<P>
+After some consideration, I have decided not to use
+GNU <CODE>autoconf</CODE> to configure 0.9.5 or 1.0.
+
+</P>
+<P>
+<CODE>autoconf</CODE>, admirable and wonderful though it is, 
+mainly assists with portability problems between Unix-like
+platforms.  But <CODE>bzip2</CODE> doesn't have much in the way
+of portability problems on Unix; most of the difficulties appear
+when porting to the Mac, or to Microsoft's operating systems.
+<CODE>autoconf</CODE> doesn't help in those cases, and brings in a 
+whole load of new complexity.
+
+</P>
+<P>
+Most people should be able to compile the library and program
+under Unix straight out-of-the-box, so to speak, especially 
+if you have a version of GNU C available.
+
+</P>
+<P>
+There are a couple of <CODE>__inline__</CODE> directives in the code.  GNU C
+(<CODE>gcc</CODE>) should be able to handle them.  If you're not using
+GNU C, your C compiler shouldn't see them at all.
+If your compiler does, for some reason, see them and doesn't
+like them, just <CODE>#define</CODE> <CODE>__inline__</CODE> to be <CODE>/* */</CODE>.  One
+easy way to do this is to compile with the flag <CODE>-D__inline__=</CODE>, 
+which should be understood by most Unix compilers.
+
+</P>
+<P>
+If you still have difficulties, try compiling with the macro
+<CODE>BZ_STRICT_ANSI</CODE> defined.  This should enable you to build the
+library in a strictly ANSI compliant environment.  Building the program
+itself like this is dangerous and not supported, since you remove
+<CODE>bzip2</CODE>'s checks against compressing directories, symbolic links,
+devices, and other not-really-a-file entities.  This could cause
+filesystem corruption!
+
+</P>
+<P>
+One other thing: if you create a <CODE>bzip2</CODE> binary for public
+distribution, please try and link it statically (<CODE>gcc -s</CODE>).  This
+avoids all sorts of library-version issues that others may encounter
+later on.
+
+</P>
+<P>
+If you build <CODE>bzip2</CODE> on Win32, you must set <CODE>BZ_UNIX</CODE> to 0 and
+<CODE>BZ_LCCWIN32</CODE> to 1, in the file <CODE>bzip2.c</CODE>, before compiling.
+Otherwise the resulting binary won't work correctly.
+
+</P>
+
+
+
+<H2><A NAME="SEC46" HREF="manual_toc.html#TOC46">Reporting bugs</A></H2>
+<P>
+I tried pretty hard to make sure <CODE>bzip2</CODE> is
+bug free, both by design and by testing.  Hopefully
+you'll never need to read this section for real.
+
+</P>
+<P>
+Nevertheless, if <CODE>bzip2</CODE> dies with a segmentation
+fault, a bus error or an internal assertion failure, it
+will ask you to email me a bug report.  Experience with
+version 0.1 shows that almost all these problems can
+be traced to either compiler bugs or hardware problems.
+
+<UL>
+<LI>
+
+Recompile the program with no optimisation, and see if it
+works.  And/or try a different compiler.
+I heard all sorts of stories about various flavours
+of GNU C (and other compilers) generating bad code for
+<CODE>bzip2</CODE>, and I've run across two such examples myself.
+
+2.7.X versions of GNU C are known to generate bad code from
+time to time, at high optimisation levels.  
+If you get problems, try using the flags
+<CODE>-O2</CODE> <CODE>-fomit-frame-pointer</CODE> <CODE>-fno-strength-reduce</CODE>.
+You should specifically <EM>not</EM> use <CODE>-funroll-loops</CODE>.
+
+You may notice that the Makefile runs six tests as part of
+the build process.  If the program passes all of these, it's
+a pretty good (but not 100%) indication that the compiler has
+done its job correctly.
+<LI>
+
+If <CODE>bzip2</CODE> crashes randomly, and the crashes are not
+repeatable, you may have a flaky memory subsystem.  <CODE>bzip2</CODE>
+really hammers your memory hierarchy, and if it's a bit marginal,
+you may get these problems.  Ditto if your disk or I/O subsystem
+is slowly failing.  Yup, this really does happen.
+
+Try using a different machine of the same type, and see if
+you can repeat the problem.
+<LI>This isn't really a bug, but ... If <CODE>bzip2</CODE> tells
+
+you your file is corrupted on decompression, and you
+obtained the file via FTP, there is a possibility that you
+forgot to tell FTP to do a binary mode transfer.  That absolutely
+will cause the file to be non-decompressible.  You'll have to transfer
+it again.
+</UL>
+
+<P>
+If you've incorporated <CODE>libbzip2</CODE> into your own program
+and are getting problems, please, please, please, check that the 
+parameters you are passing in calls to the library, are
+correct, and in accordance with what the documentation says
+is allowable.  I have tried to make the library robust against
+such problems, but I'm sure I haven't succeeded.
+
+</P>
+<P>
+Finally, if the above comments don't help, you'll have to send
+me a bug report.  Now, it's just amazing how many people will 
+send me a bug report saying something like
+
+<PRE>
+   bzip2 crashed with segmentation fault on my machine
+</PRE>
+
+<P>
+and absolutely nothing else.  Needless to say, a such a report
+is <EM>totally, utterly, completely and comprehensively 100% useless; 
+a waste of your time, my time, and net bandwidth</EM>.
+With no details at all, there's no way I can possibly begin
+to figure out what the problem is.
+
+</P>
+<P>
+The rules of the game are: facts, facts, facts.  Don't omit
+them because "oh, they won't be relevant".  At the bare 
+minimum:
+
+<PRE>
+   Machine type.  Operating system version.  
+   Exact version of <CODE>bzip2</CODE> (do <CODE>bzip2 -V</CODE>).  
+   Exact version of the compiler used.  
+   Flags passed to the compiler.
+</PRE>
+
+<P>
+However, the most important single thing that will help me is
+the file that you were trying to compress or decompress at the
+time the problem happened.  Without that, my ability to do anything
+more than speculate about the cause, is limited.
+
+</P>
+<P>
+Please remember that I connect to the Internet with a modem, so
+you should contact me before mailing me huge files.
+
+</P>
+
+
+
+<H2><A NAME="SEC47" HREF="manual_toc.html#TOC47">Did you get the right package?</A></H2>
+
+<P>
+<CODE>bzip2</CODE> is a resource hog.  It soaks up large amounts of CPU cycles
+and memory.  Also, it gives very large latencies.  In the worst case, you
+can feed many megabytes of uncompressed data into the library before
+getting any compressed output, so this probably rules out applications
+requiring interactive behaviour.
+
+</P>
+<P>
+These aren't faults of my implementation, I hope, but more
+an intrinsic property of the Burrows-Wheeler transform (unfortunately).  
+Maybe this isn't what you want.
+
+</P>
+<P>
+If you want a compressor and/or library which is faster, uses less
+memory but gets pretty good compression, and has minimal latency,
+consider Jean-loup
+Gailly's and Mark Adler's work, <CODE>zlib-1.1.2</CODE> and
+<CODE>gzip-1.2.4</CODE>.  Look for them at
+
+</P>
+<P>
+<CODE>http://www.cdrom.com/pub/infozip/zlib</CODE> and
+<CODE>http://www.gzip.org</CODE> respectively.
+
+</P>
+<P>
+For something faster and lighter still, you might try Markus F X J
+Oberhumer's <CODE>LZO</CODE> real-time compression/decompression library, at
+<BR> <CODE>http://wildsau.idv.uni-linz.ac.at/mfx/lzo.html</CODE>.
+
+</P>
+<P>
+If you want to use the <CODE>bzip2</CODE> algorithms to compress small blocks
+of data, 64k bytes or smaller, for example on an on-the-fly disk
+compressor, you'd be well advised not to use this library.  Instead,
+I've made a special library tuned for that kind of use.  It's part of
+<CODE>e2compr-0.40</CODE>, an on-the-fly disk compressor for the Linux
+<CODE>ext2</CODE> filesystem.  Look at
+<CODE>http://www.netspace.net.au/~reiter/e2compr</CODE>.
+
+</P>
+
+
+
+<H2><A NAME="SEC48" HREF="manual_toc.html#TOC48">Testing</A></H2>
+
+<P>
+A record of the tests I've done.
+
+</P>
+<P>
+First, some data sets:
+
+<UL>
+<LI>B: a directory containing 6001 files, one for every length in the
+
+      range 0 to 6000 bytes.  The files contain random lowercase
+      letters.  18.7 megabytes.
+<LI>H: my home directory tree.  Documents, source code, mail files,
+
+      compressed data.  H contains B, and also a directory of 
+      files designed as boundary cases for the sorting; mostly very
+      repetitive, nasty files.  565 megabytes.
+<LI>A: directory tree holding various applications built from source:
+
+      <CODE>egcs</CODE>, <CODE>gcc-2.8.1</CODE>, KDE, GTK, Octave, etc.
+      2200 megabytes.
+</UL>
+
+<P>
+The tests conducted are as follows.  Each test means compressing 
+(a copy of) each file in the data set, decompressing it and
+comparing it against the original.
+
+</P>
+<P>
+First, a bunch of tests with block sizes and internal buffer
+sizes set very small, 
+to detect any problems with the
+blocking and buffering mechanisms.  
+This required modifying the source code so as to try to 
+break it.
+
+<OL>
+<LI>Data set H, with
+
+      buffer size of 1 byte, and block size of 23 bytes.
+<LI>Data set B, buffer sizes 1 byte, block size 1 byte.
+
+<LI>As (2) but small-mode decompression.
+
+<LI>As (2) with block size 2 bytes.
+
+<LI>As (2) with block size 3 bytes.
+
+<LI>As (2) with block size 4 bytes.
+
+<LI>As (2) with block size 5 bytes.
+
+<LI>As (2) with block size 6 bytes and small-mode decompression.
+
+<LI>H with buffer size of 1 byte, but normal block
+
+      size (up to 900000 bytes).
+</OL>
+
+<P>
+Then some tests with unmodified source code.
+
+<OL>
+<LI>H, all settings normal.
+
+<LI>As (1), with small-mode decompress.
+
+<LI>H, compress with flag <CODE>-1</CODE>.
+
+<LI>H, compress with flag <CODE>-s</CODE>, decompress with flag <CODE>-s</CODE>.
+
+<LI>Forwards compatibility: H, <CODE>bzip2-0.1pl2</CODE> compressing,
+
+      <CODE>bzip2-0.9.5</CODE> decompressing, all settings normal.
+<LI>Backwards compatibility:  H, <CODE>bzip2-0.9.5</CODE> compressing,
+
+      <CODE>bzip2-0.1pl2</CODE> decompressing, all settings normal.
+<LI>Bigger tests: A, all settings normal.
+
+<LI>As (7), using the fallback (Sadakane-like) sorting algorithm.
+
+<LI>As (8), compress with flag <CODE>-1</CODE>, decompress with flag
+
+      <CODE>-s</CODE>.
+<LI>H, using the fallback sorting algorithm.
+
+<LI>Forwards compatibility: A, <CODE>bzip2-0.1pl2</CODE> compressing,
+
+      <CODE>bzip2-0.9.5</CODE> decompressing, all settings normal.
+<LI>Backwards compatibility:  A, <CODE>bzip2-0.9.5</CODE> compressing,
+
+      <CODE>bzip2-0.1pl2</CODE> decompressing, all settings normal.
+<LI>Misc test: about 400 megabytes of <CODE>.tar</CODE> files with
+
+      <CODE>bzip2</CODE> compiled with Checker (a memory access error
+       detector, like Purify).
+<LI>Misc tests to make sure it builds and runs ok on non-Linux/x86
+
+      platforms.
+</OL>
+
+<P>
+These tests were conducted on a 225 MHz IDT WinChip machine, running
+Linux 2.0.36.  They represent nearly a week of continuous computation.
+All tests completed successfully.
+
+</P>
+
+
+
+<H2><A NAME="SEC49" HREF="manual_toc.html#TOC49">Further reading</A></H2>
+<P>
+<CODE>bzip2</CODE> is not research work, in the sense that it doesn't present
+any new ideas.  Rather, it's an engineering exercise based on existing
+ideas.
+
+</P>
+<P>
+Four documents describe essentially all the ideas behind <CODE>bzip2</CODE>:
+
+<PRE>
+Michael Burrows and D. J. Wheeler:
+  "A block-sorting lossless data compression algorithm"
+   10th May 1994. 
+   Digital SRC Research Report 124.
+   ftp://ftp.digital.com/pub/DEC/SRC/research-reports/SRC-124.ps.gz
+   If you have trouble finding it, try searching at the
+   New Zealand Digital Library, http://www.nzdl.org.
+
+Daniel S. Hirschberg and Debra A. LeLewer
+  "Efficient Decoding of Prefix Codes"
+   Communications of the ACM, April 1990, Vol 33, Number 4.
+   You might be able to get an electronic copy of this
+      from the ACM Digital Library.
+
+David J. Wheeler
+   Program bred3.c and accompanying document bred3.ps.
+   This contains the idea behind the multi-table Huffman
+   coding scheme.
+   ftp://ftp.cl.cam.ac.uk/users/djw3/
+
+Jon L. Bentley and Robert Sedgewick
+  "Fast Algorithms for Sorting and Searching Strings"
+   Available from Sedgewick's web page,
+   www.cs.princeton.edu/~rs
+</PRE>
+
+<P>
+The following paper gives valuable additional insights into the
+algorithm, but is not immediately the basis of any code
+used in bzip2.
+
+<PRE>
+Peter Fenwick:
+   Block Sorting Text Compression
+   Proceedings of the 19th Australasian Computer Science Conference,
+     Melbourne, Australia.  Jan 31 - Feb 2, 1996.
+   ftp://ftp.cs.auckland.ac.nz/pub/peter-f/ACSC96paper.ps
+</PRE>
+
+<P>
+Kunihiko Sadakane's sorting algorithm, mentioned above,
+is available from:
+
+<PRE>
+http://naomi.is.s.u-tokyo.ac.jp/~sada/papers/Sada98b.ps.gz
+</PRE>
+
+<P>
+The Manber-Myers suffix array construction
+algorithm is described in a paper
+available from:
+
+<PRE>
+http://www.cs.arizona.edu/people/gene/PAPERS/suffix.ps
+</PRE>
+
+<P>
+Finally, the following paper documents some recent investigations
+I made into the performance of sorting algorithms:
+
+<PRE>
+Julian Seward:
+   On the Performance of BWT Sorting Algorithms
+   Proceedings of the IEEE Data Compression Conference 2000
+     Snowbird, Utah.  28-30 March 2000.
+</PRE>
+
+<P><HR><P>
+<p>Go to the <A HREF="manual_1.html">first</A>, <A HREF="manual_3.html">previous</A>, next, last section, <A HREF="manual_toc.html">table of contents</A>.
+</BODY>
+</HTML>
diff --git a/winsup/bz2lib/manual_toc.html b/winsup/bz2lib/manual_toc.html
new file mode 100644
index 000000000..d4132c435
--- /dev/null
+++ b/winsup/bz2lib/manual_toc.html
@@ -0,0 +1,173 @@
+<HTML>
+<HEAD>
+<!-- This HTML file has been created by texi2html 1.54
+     from manual.texi on 23 March 2000 -->
+
+<TITLE>bzip2 and libbzip2 - Table of Contents</TITLE>
+
+</HEAD>
+<BODY>
+<H1>bzip2 and libbzip2</H1>
+<H2>a program and library for data compression</H2>
+<H2>copyright (C) 1996-2000 Julian Seward</H2>
+<H2>version 1.0 of 21 March 2000</H2>
+<ADDRESS>Julian Seward</ADDRESS>
+<P>
+<P><HR><P>
+
+<P>
+This program, <CODE>bzip2</CODE>, 
+and associated library <CODE>libbzip2</CODE>, are
+Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+</P>
+<P>
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+<UL>
+<LI>
+
+   Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+<LI>
+
+   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.
+<LI>
+
+   Altered source versions must be plainly marked as such, and must
+   not be misrepresented as being the original software.
+<LI>
+
+   The name of the author may not be used to endorse or promote 
+   products derived from this software without specific prior written 
+   permission.
+</UL>
+
+<P>
+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.
+
+</P>
+<P>
+Julian Seward, Cambridge, UK.
+
+</P>
+<P>
+<CODE>jseward@acm.org</CODE>
+
+</P>
+<P>
+<CODE>http://sourceware.cygnus.com/bzip2</CODE>
+
+</P>
+<P>
+<CODE>http://www.cacheprof.org</CODE>
+
+</P>
+<P>
+<CODE>http://www.muraroa.demon.co.uk</CODE>
+
+</P>
+<P>
+<CODE>bzip2</CODE>/<CODE>libbzip2</CODE> version 1.0 of 21 March 2000.
+
+</P>
+<P>
+PATENTS: To the best of my knowledge, <CODE>bzip2</CODE> does not use any patented
+algorithms.  However, I do not have the resources available to carry out
+a full patent search.  Therefore I cannot give any guarantee of the
+above statement.
+
+</P>
+
+<UL>
+<LI><A NAME="TOC1" HREF="manual_1.html#SEC1">Introduction</A>
+<LI><A NAME="TOC2" HREF="manual_2.html#SEC2">How to use <CODE>bzip2</CODE></A>
+<UL>
+<UL>
+<UL>
+<LI><A NAME="TOC3" HREF="manual_2.html#SEC3">NAME</A>
+<LI><A NAME="TOC4" HREF="manual_2.html#SEC4">SYNOPSIS</A>
+<LI><A NAME="TOC5" HREF="manual_2.html#SEC5">DESCRIPTION</A>
+<LI><A NAME="TOC6" HREF="manual_2.html#SEC6">OPTIONS</A>
+<LI><A NAME="TOC7" HREF="manual_2.html#SEC7">MEMORY MANAGEMENT</A>
+<LI><A NAME="TOC8" HREF="manual_2.html#SEC8">RECOVERING DATA FROM DAMAGED FILES</A>
+<LI><A NAME="TOC9" HREF="manual_2.html#SEC9">PERFORMANCE NOTES</A>
+<LI><A NAME="TOC10" HREF="manual_2.html#SEC10">CAVEATS</A>
+<LI><A NAME="TOC11" HREF="manual_2.html#SEC11">AUTHOR</A>
+</UL>
+</UL>
+</UL>
+<LI><A NAME="TOC12" HREF="manual_3.html#SEC12">Programming with <CODE>libbzip2</CODE></A>
+<UL>
+<LI><A NAME="TOC13" HREF="manual_3.html#SEC13">Top-level structure</A>
+<UL>
+<LI><A NAME="TOC14" HREF="manual_3.html#SEC14">Low-level summary</A>
+<LI><A NAME="TOC15" HREF="manual_3.html#SEC15">High-level summary</A>
+<LI><A NAME="TOC16" HREF="manual_3.html#SEC16">Utility functions summary</A>
+</UL>
+<LI><A NAME="TOC17" HREF="manual_3.html#SEC17">Error handling</A>
+<LI><A NAME="TOC18" HREF="manual_3.html#SEC18">Low-level interface</A>
+<UL>
+<LI><A NAME="TOC19" HREF="manual_3.html#SEC19"><CODE>BZ2_bzCompressInit</CODE></A>
+<LI><A NAME="TOC20" HREF="manual_3.html#SEC20"><CODE>BZ2_bzCompress</CODE></A>
+<LI><A NAME="TOC21" HREF="manual_3.html#SEC21"><CODE>BZ2_bzCompressEnd</CODE></A>
+<LI><A NAME="TOC22" HREF="manual_3.html#SEC22"><CODE>BZ2_bzDecompressInit</CODE></A>
+<LI><A NAME="TOC23" HREF="manual_3.html#SEC23"><CODE>BZ2_bzDecompress</CODE></A>
+<LI><A NAME="TOC24" HREF="manual_3.html#SEC24"><CODE>BZ2_bzDecompressEnd</CODE></A>
+</UL>
+<LI><A NAME="TOC25" HREF="manual_3.html#SEC25">High-level interface</A>
+<UL>
+<LI><A NAME="TOC26" HREF="manual_3.html#SEC26"><CODE>BZ2_bzReadOpen</CODE></A>
+<LI><A NAME="TOC27" HREF="manual_3.html#SEC27"><CODE>BZ2_bzRead</CODE></A>
+<LI><A NAME="TOC28" HREF="manual_3.html#SEC28"><CODE>BZ2_bzReadGetUnused</CODE></A>
+<LI><A NAME="TOC29" HREF="manual_3.html#SEC29"><CODE>BZ2_bzReadClose</CODE></A>
+<LI><A NAME="TOC30" HREF="manual_3.html#SEC30"><CODE>BZ2_bzWriteOpen</CODE></A>
+<LI><A NAME="TOC31" HREF="manual_3.html#SEC31"><CODE>BZ2_bzWrite</CODE></A>
+<LI><A NAME="TOC32" HREF="manual_3.html#SEC32"><CODE>BZ2_bzWriteClose</CODE></A>
+<LI><A NAME="TOC33" HREF="manual_3.html#SEC33">Handling embedded compressed data streams</A>
+<LI><A NAME="TOC34" HREF="manual_3.html#SEC34">Standard file-reading/writing code</A>
+</UL>
+<LI><A NAME="TOC35" HREF="manual_3.html#SEC35">Utility functions</A>
+<UL>
+<LI><A NAME="TOC36" HREF="manual_3.html#SEC36"><CODE>BZ2_bzBuffToBuffCompress</CODE></A>
+<LI><A NAME="TOC37" HREF="manual_3.html#SEC37"><CODE>BZ2_bzBuffToBuffDecompress</CODE></A>
+</UL>
+<LI><A NAME="TOC38" HREF="manual_3.html#SEC38"><CODE>zlib</CODE> compatibility functions</A>
+<LI><A NAME="TOC39" HREF="manual_3.html#SEC39">Using the library in a <CODE>stdio</CODE>-free environment</A>
+<UL>
+<LI><A NAME="TOC40" HREF="manual_3.html#SEC40">Getting rid of <CODE>stdio</CODE></A>
+<LI><A NAME="TOC41" HREF="manual_3.html#SEC41">Critical error handling</A>
+</UL>
+<LI><A NAME="TOC42" HREF="manual_3.html#SEC42">Making a Windows DLL</A>
+</UL>
+<LI><A NAME="TOC43" HREF="manual_4.html#SEC43">Miscellanea</A>
+<UL>
+<LI><A NAME="TOC44" HREF="manual_4.html#SEC44">Limitations of the compressed file format</A>
+<LI><A NAME="TOC45" HREF="manual_4.html#SEC45">Portability issues</A>
+<LI><A NAME="TOC46" HREF="manual_4.html#SEC46">Reporting bugs</A>
+<LI><A NAME="TOC47" HREF="manual_4.html#SEC47">Did you get the right package?</A>
+<LI><A NAME="TOC48" HREF="manual_4.html#SEC48">Testing</A>
+<LI><A NAME="TOC49" HREF="manual_4.html#SEC49">Further reading</A>
+</UL>
+</UL>
+<P><HR><P>
+This document was generated on 23 March 2000 using the
+<A HREF="http://wwwcn.cern.ch/dci/texi2html/">texi2html</A>
+translator version 1.51a.</P>
+</BODY>
+</HTML>
diff --git a/winsup/bz2lib/randtable.c b/winsup/bz2lib/randtable.c
new file mode 100644
index 000000000..983089d46
--- /dev/null
+++ b/winsup/bz2lib/randtable.c
@@ -0,0 +1,124 @@
+
+/*-------------------------------------------------------------*/
+/*--- Table for randomising repetitive blocks               ---*/
+/*---                                           randtable.c ---*/
+/*-------------------------------------------------------------*/
+
+/*--
+  This file is a part of bzip2 and/or libbzip2, a program and
+  library for lossless, block-sorting data compression.
+
+  Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
+
+  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. 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.
+
+  3. Altered source versions must be plainly marked as such, and must
+     not be misrepresented as being the original software.
+
+  4. 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.
+
+  Julian Seward, Cambridge, UK.
+  jseward@acm.org
+  bzip2/libbzip2 version 1.0 of 21 March 2000
+
+  This program is based on (at least) the work of:
+     Mike Burrows
+     David Wheeler
+     Peter Fenwick
+     Alistair Moffat
+     Radford Neal
+     Ian H. Witten
+     Robert Sedgewick
+     Jon L. Bentley
+
+  For more information on these sources, see the manual.
+--*/
+
+
+#include "bzlib_private.h"
+
+
+/*---------------------------------------------*/
+Int32 BZ2_rNums[512] = { 
+   619, 720, 127, 481, 931, 816, 813, 233, 566, 247, 
+   985, 724, 205, 454, 863, 491, 741, 242, 949, 214, 
+   733, 859, 335, 708, 621, 574, 73, 654, 730, 472, 
+   419, 436, 278, 496, 867, 210, 399, 680, 480, 51, 
+   878, 465, 811, 169, 869, 675, 611, 697, 867, 561, 
+   862, 687, 507, 283, 482, 129, 807, 591, 733, 623, 
+   150, 238, 59, 379, 684, 877, 625, 169, 643, 105, 
+   170, 607, 520, 932, 727, 476, 693, 425, 174, 647, 
+   73, 122, 335, 530, 442, 853, 695, 249, 445, 515, 
+   909, 545, 703, 919, 874, 474, 882, 500, 594, 612, 
+   641, 801, 220, 162, 819, 984, 589, 513, 495, 799, 
+   161, 604, 958, 533, 221, 400, 386, 867, 600, 782, 
+   382, 596, 414, 171, 516, 375, 682, 485, 911, 276, 
+   98, 553, 163, 354, 666, 933, 424, 341, 533, 870, 
+   227, 730, 475, 186, 263, 647, 537, 686, 600, 224, 
+   469, 68, 770, 919, 190, 373, 294, 822, 808, 206, 
+   184, 943, 795, 384, 383, 461, 404, 758, 839, 887, 
+   715, 67, 618, 276, 204, 918, 873, 777, 604, 560, 
+   951, 160, 578, 722, 79, 804, 96, 409, 713, 940, 
+   652, 934, 970, 447, 318, 353, 859, 672, 112, 785, 
+   645, 863, 803, 350, 139, 93, 354, 99, 820, 908, 
+   609, 772, 154, 274, 580, 184, 79, 626, 630, 742, 
+   653, 282, 762, 623, 680, 81, 927, 626, 789, 125, 
+   411, 521, 938, 300, 821, 78, 343, 175, 128, 250, 
+   170, 774, 972, 275, 999, 639, 495, 78, 352, 126, 
+   857, 956, 358, 619, 580, 124, 737, 594, 701, 612, 
+   669, 112, 134, 694, 363, 992, 809, 743, 168, 974, 
+   944, 375, 748, 52, 600, 747, 642, 182, 862, 81, 
+   344, 805, 988, 739, 511, 655, 814, 334, 249, 515, 
+   897, 955, 664, 981, 649, 113, 974, 459, 893, 228, 
+   433, 837, 553, 268, 926, 240, 102, 654, 459, 51, 
+   686, 754, 806, 760, 493, 403, 415, 394, 687, 700, 
+   946, 670, 656, 610, 738, 392, 760, 799, 887, 653, 
+   978, 321, 576, 617, 626, 502, 894, 679, 243, 440, 
+   680, 879, 194, 572, 640, 724, 926, 56, 204, 700, 
+   707, 151, 457, 449, 797, 195, 791, 558, 945, 679, 
+   297, 59, 87, 824, 713, 663, 412, 693, 342, 606, 
+   134, 108, 571, 364, 631, 212, 174, 643, 304, 329, 
+   343, 97, 430, 751, 497, 314, 983, 374, 822, 928, 
+   140, 206, 73, 263, 980, 736, 876, 478, 430, 305, 
+   170, 514, 364, 692, 829, 82, 855, 953, 676, 246, 
+   369, 970, 294, 750, 807, 827, 150, 790, 288, 923, 
+   804, 378, 215, 828, 592, 281, 565, 555, 710, 82, 
+   896, 831, 547, 261, 524, 462, 293, 465, 502, 56, 
+   661, 821, 976, 991, 658, 869, 905, 758, 745, 193, 
+   768, 550, 608, 933, 378, 286, 215, 979, 792, 961, 
+   61, 688, 793, 644, 986, 403, 106, 366, 905, 644, 
+   372, 567, 466, 434, 645, 210, 389, 550, 919, 135, 
+   780, 773, 635, 389, 707, 100, 626, 958, 165, 504, 
+   920, 176, 193, 713, 857, 265, 203, 50, 668, 108, 
+   645, 990, 626, 197, 510, 357, 358, 850, 858, 364, 
+   936, 638
+};
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                       randtable.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/winsup/bz2lib/sample1.bz2 b/winsup/bz2lib/sample1.bz2
new file mode 100644
index 000000000..18dea6004
--- /dev/null
+++ b/winsup/bz2lib/sample1.bz2
diff --git a/winsup/bz2lib/sample1.ref b/winsup/bz2lib/sample1.ref
new file mode 100644
index 000000000..a56e52b77
--- /dev/null
+++ b/winsup/bz2lib/sample1.ref
diff --git a/winsup/bz2lib/sample2.bz2 b/winsup/bz2lib/sample2.bz2
new file mode 100644
index 000000000..d5a6160ba
--- /dev/null
+++ b/winsup/bz2lib/sample2.bz2
diff --git a/winsup/bz2lib/sample2.ref b/winsup/bz2lib/sample2.ref
new file mode 100644
index 000000000..34af95839
--- /dev/null
+++ b/winsup/bz2lib/sample2.ref
diff --git a/winsup/bz2lib/sample3.bz2 b/winsup/bz2lib/sample3.bz2
new file mode 100644
index 000000000..d90cff920
--- /dev/null
+++ b/winsup/bz2lib/sample3.bz2
diff --git a/winsup/bz2lib/sample3.ref b/winsup/bz2lib/sample3.ref
new file mode 100644
index 000000000..775a2f68e
--- /dev/null
+++ b/winsup/bz2lib/sample3.ref
@@ -0,0 +1,30007 @@
+This file is exceedingly boring.  If you find yourself
+reading it, please (1) take it from me that you can safely
+guess what the rest of the file says, and (2) seek professional
+help.
+
+ps.  there are no further sarcastic remarks in this file.
+
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
+ugh
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diff --git a/winsup/bz2lib/spewG.c b/winsup/bz2lib/spewG.c
new file mode 100644
index 000000000..7934e7658
--- /dev/null
+++ b/winsup/bz2lib/spewG.c
@@ -0,0 +1,39 @@
+
+/* spew out a thoroughly gigantic file designed so that bzip2
+   can compress it reasonably rapidly.  This is to help test
+   support for large files (> 2GB) in a reasonable amount of time.
+   I suggest you use the undocumented --exponential option to
+   bzip2 when compressing the resulting file; this saves a bit of
+   time.  Note: *don't* bother with --exponential when compressing 
+   Real Files; it'll just waste a lot of CPU time :-)
+   (but is otherwise harmless).
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <stdio.h>
+#include <stdlib.h>
+
+/* The number of megabytes of junk to spew out (roughly) */
+#define MEGABYTES 5000
+
+#define N_BUF 1000000
+char buf[N_BUF];
+
+int main ( int argc, char** argv )
+{
+   int ii, kk, p;
+   srandom(1);
+   setbuffer ( stdout, buf, N_BUF );
+   for (kk = 0; kk < MEGABYTES * 515; kk+=3) {
+      p = 25+random()%50;
+      for (ii = 0; ii < p; ii++)
+         printf ( "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" );
+      for (ii = 0; ii < p-1; ii++)
+         printf ( "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb" );
+      for (ii = 0; ii < p+1; ii++)
+         printf ( "ccccccccccccccccccccccccccccccccccccc" );
+   }
+   fflush(stdout);
+   return 0;
+}
diff --git a/winsup/bz2lib/unzcrash.c b/winsup/bz2lib/unzcrash.c
new file mode 100644
index 000000000..f0f17fcca
--- /dev/null
+++ b/winsup/bz2lib/unzcrash.c
@@ -0,0 +1,126 @@
+
+/* A test program written to test robustness to decompression of
+   corrupted data.  Usage is 
+       unzcrash filename
+   and the program will read the specified file, compress it (in memory),
+   and then repeatedly decompress it, each time with a different bit of
+   the compressed data inverted, so as to test all possible one-bit errors.
+   This should not cause any invalid memory accesses.  If it does, 
+   I want to know about it!
+
+   p.s.  As you can see from the above description, the process is
+   incredibly slow.  A file of size eg 5KB will cause it to run for
+   many hours.
+*/
+
+#include <stdio.h>
+#include <assert.h>
+#include "bzlib.h"
+
+#define M_BLOCK 1000000
+
+typedef unsigned char uchar;
+
+#define M_BLOCK_OUT (M_BLOCK + 1000000)
+uchar inbuf[M_BLOCK];
+uchar outbuf[M_BLOCK_OUT];
+uchar zbuf[M_BLOCK + 600 + (M_BLOCK / 100)];
+
+int nIn, nOut, nZ;
+
+static char *bzerrorstrings[] = {
+       "OK"
+      ,"SEQUENCE_ERROR"
+      ,"PARAM_ERROR"
+      ,"MEM_ERROR"
+      ,"DATA_ERROR"
+      ,"DATA_ERROR_MAGIC"
+      ,"IO_ERROR"
+      ,"UNEXPECTED_EOF"
+      ,"OUTBUFF_FULL"
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+      ,"???"   /* for future */
+};
+
+void flip_bit ( int bit )
+{
+   int byteno = bit / 8;
+   int bitno  = bit % 8;
+   uchar mask = 1 << bitno;
+   //fprintf ( stderr, "(byte %d  bit %d  mask %d)",
+   //          byteno, bitno, (int)mask );
+   zbuf[byteno] ^= mask;
+}
+
+int main ( int argc, char** argv )
+{
+   FILE* f;
+   int   r;
+   int   bit;
+   int   i;
+
+   if (argc != 2) {
+      fprintf ( stderr, "usage: unzcrash filename\n" );
+      return 1;
+   }
+
+   f = fopen ( argv[1], "r" );
+   if (!f) {
+      fprintf ( stderr, "unzcrash: can't open %s\n", argv[1] );
+      return 1;
+   }
+
+   nIn = fread ( inbuf, 1, M_BLOCK, f );
+   fprintf ( stderr, "%d bytes read\n", nIn );
+
+   nZ = M_BLOCK;
+   r = BZ2_bzBuffToBuffCompress (
+         zbuf, &nZ, inbuf, nIn, 9, 0, 30 );
+
+   assert (r == BZ_OK);
+   fprintf ( stderr, "%d after compression\n", nZ );
+
+   for (bit = 0; bit < nZ*8; bit++) {
+      fprintf ( stderr, "bit %d  ", bit );
+      flip_bit ( bit );
+      nOut = M_BLOCK_OUT;
+      r = BZ2_bzBuffToBuffDecompress (
+            outbuf, &nOut, zbuf, nZ, 0, 0 );
+      fprintf ( stderr, " %d  %s ", r, bzerrorstrings[-r] );
+
+      if (r != BZ_OK) {
+         fprintf ( stderr, "\n" );
+      } else {
+         if (nOut != nIn) {
+           fprintf(stderr, "nIn/nOut mismatch %d %d\n", nIn, nOut );
+           return 1;
+         } else {
+           for (i = 0; i < nOut; i++)
+             if (inbuf[i] != outbuf[i]) { 
+                fprintf(stderr, "mismatch at %d\n", i ); 
+                return 1; 
+           }
+           if (i == nOut) fprintf(stderr, "really ok!\n" );
+         }
+      }
+
+      flip_bit ( bit );
+   }
+
+#if 0
+   assert (nOut == nIn);
+   for (i = 0; i < nOut; i++) {
+     if (inbuf[i] != outbuf[i]) {
+        fprintf ( stderr, "difference at %d !\n", i );
+        return 1;
+     }
+   }
+#endif
+
+   fprintf ( stderr, "all ok\n" );
+   return 0;
+}
diff --git a/winsup/bz2lib/words0 b/winsup/bz2lib/words0
new file mode 100644
index 000000000..164a8ed28
--- /dev/null
+++ b/winsup/bz2lib/words0
@@ -0,0 +1,5 @@
+
+If compilation produces errors, or a large number of warnings, 
+please read README.COMPILATION.PROBLEMS -- you might be able to
+adjust the flags in this Makefile to improve matters.
+
diff --git a/winsup/bz2lib/words1 b/winsup/bz2lib/words1
new file mode 100644
index 000000000..2e83de9f0
--- /dev/null
+++ b/winsup/bz2lib/words1
@@ -0,0 +1,4 @@
+
+Doing 6 tests (3 compress, 3 uncompress) ...
+If there's a problem, things might stop at this point.
+ 
diff --git a/winsup/bz2lib/words2 b/winsup/bz2lib/words2
new file mode 100644
index 000000000..203ee39c4
--- /dev/null
+++ b/winsup/bz2lib/words2
@@ -0,0 +1,5 @@
+
+Checking test results.  If any of the four "cmp"s which follow
+report any differences, something is wrong.  If you can't easily
+figure out what, please let me know (jseward@acm.org).
+
diff --git a/winsup/bz2lib/words3 b/winsup/bz2lib/words3
new file mode 100644
index 000000000..8486a84c8
--- /dev/null
+++ b/winsup/bz2lib/words3
@@ -0,0 +1,23 @@
+
+If you got this far and the "cmp"s didn't complain, it looks
+like you're in business.  
+
+To install in /usr/bin, /usr/lib, /usr/man and /usr/include, type
+   make install
+To install somewhere else, eg, /xxx/yyy/{bin,lib,man,include}, type 
+   make install PREFIX=/xxx/yyy
+If you are (justifiably) paranoid and want to see what 'make install'
+is going to do, you can first do
+   make -n install                      or
+   make -n install PREFIX=/xxx/yyy      respectively.
+The -n instructs make to show the commands it would execute, but
+not actually execute them.
+
+Instructions for use are in the preformatted manual page, in the file
+bzip2.txt.  For more detailed documentation, read the full manual.  
+It is available in Postscript form (manual.ps) and HTML form
+(manual_toc.html).
+
+You can also do "bzip2 --help" to see some helpful information. 
+"bzip2 -L" displays the software license.
+