From f08f4dcc3c02464c17753b3feafcfe5243b9e236 Mon Sep 17 00:00:00 2001
From: Igor Pavlov <ipavlov@users.sourceforge.net>
Date: Sun, 23 Nov 2014 00:00:00 +0000
Subject: 9.34

---
 CPP/7zip/Common/InBuffer.cpp | 120 +++++++++++++++++++++++++++++++------------
 1 file changed, 86 insertions(+), 34 deletions(-)
 mode change 100755 => 100644 CPP/7zip/Common/InBuffer.cpp

(limited to 'CPP/7zip/Common/InBuffer.cpp')

diff --git a/CPP/7zip/Common/InBuffer.cpp b/CPP/7zip/Common/InBuffer.cpp
old mode 100755
new mode 100644
index ad4f8825..8edefa31
--- a/CPP/7zip/Common/InBuffer.cpp
+++ b/CPP/7zip/Common/InBuffer.cpp
@@ -6,50 +6,49 @@
 
 #include "InBuffer.h"
 
-CInBuffer::CInBuffer():
-  _buffer(0),
-  _bufferLimit(0),
-  _bufferBase(0),
+CInBufferBase::CInBufferBase():
+  _buf(0),
+  _bufLim(0),
+  _bufBase(0),
   _stream(0),
-  _bufferSize(0)
+  _processedSize(0),
+  _bufSize(0),
+  _wasFinished(false),
+  NumExtraBytes(0)
 {}
 
-bool CInBuffer::Create(UInt32 bufferSize)
+bool CInBuffer::Create(size_t bufSize)
 {
-  const UInt32 kMinBlockSize = 1;
-  if (bufferSize < kMinBlockSize)
-    bufferSize = kMinBlockSize;
-  if (_bufferBase != 0 && _bufferSize == bufferSize)
+  const unsigned kMinBlockSize = 1;
+  if (bufSize < kMinBlockSize)
+    bufSize = kMinBlockSize;
+  if (_bufBase != 0 && _bufSize == bufSize)
     return true;
   Free();
-  _bufferSize = bufferSize;
-  _bufferBase = (Byte *)::MidAlloc(bufferSize);
-  return (_bufferBase != 0);
+  _bufSize = bufSize;
+  _bufBase = (Byte *)::MidAlloc(bufSize);
+  return (_bufBase != 0);
 }
 
 void CInBuffer::Free()
 {
-  ::MidFree(_bufferBase);
-  _bufferBase = 0;
+  ::MidFree(_bufBase);
+  _bufBase = 0;
 }
 
-void CInBuffer::SetStream(ISequentialInStream *stream)
-{
-  _stream = stream;
-}
-
-void CInBuffer::Init()
+void CInBufferBase::Init()
 {
   _processedSize = 0;
-  _buffer = _bufferBase;
-  _bufferLimit = _buffer;
+  _buf = _bufBase;
+  _bufLim = _buf;
   _wasFinished = false;
   #ifdef _NO_EXCEPTIONS
   ErrorCode = S_OK;
   #endif
+  NumExtraBytes = 0;
 }
 
-bool CInBuffer::ReadBlock()
+bool CInBufferBase::ReadBlock()
 {
   #ifdef _NO_EXCEPTIONS
   if (ErrorCode != S_OK)
@@ -57,27 +56,80 @@ bool CInBuffer::ReadBlock()
   #endif
   if (_wasFinished)
     return false;
-  _processedSize += (_buffer - _bufferBase);
-  UInt32 numProcessedBytes;
-  HRESULT result = _stream->Read(_bufferBase, _bufferSize, &numProcessedBytes);
+  _processedSize += (_buf - _bufBase);
+  _buf = _bufBase;
+  _bufLim = _bufBase;
+  UInt32 processed;
+  // FIX_ME: we can improve it to support (_bufSize >= (1 << 32))
+  HRESULT result = _stream->Read(_bufBase, (UInt32)_bufSize, &processed);
   #ifdef _NO_EXCEPTIONS
   ErrorCode = result;
   #else
   if (result != S_OK)
     throw CInBufferException(result);
   #endif
-  _buffer = _bufferBase;
-  _bufferLimit = _buffer + numProcessedBytes;
-  _wasFinished = (numProcessedBytes == 0);
-  return (!_wasFinished);
+  _bufLim = _buf + processed;
+  _wasFinished = (processed == 0);
+  return !_wasFinished;
 }
 
-Byte CInBuffer::ReadBlock2()
+bool CInBufferBase::ReadByte_FromNewBlock(Byte &b)
 {
   if (!ReadBlock())
   {
-    _processedSize++;
+    NumExtraBytes++;
+    b = 0xFF;
+    return false;
+  }
+  b = *_buf++;
+  return true;
+}
+
+Byte CInBufferBase::ReadByte_FromNewBlock()
+{
+  if (!ReadBlock())
+  {
+    NumExtraBytes++;
     return 0xFF;
   }
-  return *_buffer++;
+  return *_buf++;
+}
+
+size_t CInBufferBase::ReadBytes(Byte *buf, size_t size)
+{
+  if ((size_t)(_bufLim - _buf) >= size)
+  {
+    const Byte *src = _buf;
+    for (size_t i = 0; i < size; i++)
+      buf[i] = src[i];
+    _buf += size;
+    return size;
+  }
+  for (size_t i = 0; i < size; i++)
+  {
+    if (_buf >= _bufLim)
+      if (!ReadBlock())
+        return i;
+    buf[i] = *_buf++;
+  }
+  return size;
+}
+
+size_t CInBufferBase::Skip(size_t size)
+{
+  size_t processed = 0;
+  for (;;)
+  {
+    size_t rem = (_bufLim - _buf);
+    if (rem >= size)
+    {
+      _buf += size;
+      return processed + size;
+    }
+    _buf += rem;
+    processed += rem;
+    size -= rem;
+    if (!ReadBlock())
+      return processed;
+  }
 }
-- 
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