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This commit is contained in:
Igor Pavlov
2005-05-30 00:00:00 +00:00
committed by Kornel Lesiński
parent 8c1b5c7b7e
commit 3c510ba80b
926 changed files with 40559 additions and 23519 deletions
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7zip/Compress/ByteSwap/ByteSwap.cpp
+23 -85
View File
@@ -1,100 +1,38 @@
// Coder.cpp
// ByteSwap.cpp
#include "StdAfx.h"
#include "ByteSwap.h"
#include "Windows/Defs.h"
const int kBufferSize = 1 << 17;
STDMETHODIMP CByteSwap2::Init() { return S_OK; }
CBuffer::CBuffer():
_buffer(0)
STDMETHODIMP_(UInt32) CByteSwap2::Filter(Byte *data, UInt32 size)
{
_buffer = new BYTE[kBufferSize];
}
CBuffer::~CBuffer()
{
delete []_buffer;
}
STDMETHODIMP CByteSwap2::Code(ISequentialInStream *inStream,
ISequentialOutStream *outStream, const UINT64 *inSize, const UINT64 *outSize,
ICompressProgressInfo *progress)
{
const UINT32 kStep = 2;
UINT32 bufferPos = 0;
UINT64 nowPos64 = 0;
while(true)
const UInt32 kStep = 2;
UInt32 i;
for (i = 0; i + kStep <= size; i += kStep)
{
UINT32 processedSize;
UINT32 size = kBufferSize - bufferPos;
RINOK(inStream->Read(_buffer + bufferPos, size, &processedSize));
if (processedSize == 0)
return outStream->Write(_buffer, bufferPos, NULL);
UINT32 endPos = bufferPos + processedSize;
for (UINT32 curPos = 0; curPos + kStep <= endPos; curPos += kStep)
{
BYTE data[kStep];
data[0] = _buffer[curPos + 0];
data[1] = _buffer[curPos + 1];
_buffer[curPos + 0] = data[1];
_buffer[curPos + 1] = data[0];
}
RINOK(outStream->Write(_buffer, curPos, &processedSize));
if (curPos != processedSize)
return E_FAIL;
nowPos64 += curPos;
if (progress != NULL)
{
RINOK(progress->SetRatioInfo(&nowPos64, &nowPos64));
}
bufferPos = 0;
while(curPos < endPos)
_buffer[bufferPos++] = _buffer[curPos++];
Byte b = data[i];
data[i] = data[i + 1];
data[i + 1] = b;
}
return i;
}
STDMETHODIMP CByteSwap4::Code(ISequentialInStream *inStream,
ISequentialOutStream *outStream, const UINT64 *inSize, const UINT64 *outSize,
ICompressProgressInfo *progress)
STDMETHODIMP CByteSwap4::Init() { return S_OK; }
STDMETHODIMP_(UInt32) CByteSwap4::Filter(Byte *data, UInt32 size)
{
const UINT32 kStep = 4;
UINT32 bufferPos = 0;
UINT64 nowPos64 = 0;
while(true)
const UInt32 kStep = 4;
UInt32 i;
for (i = 0; i + kStep <= size; i += kStep)
{
UINT32 processedSize;
UINT32 size = kBufferSize - bufferPos;
RINOK(inStream->Read(_buffer + bufferPos, size, &processedSize));
if (processedSize == 0)
return outStream->Write(_buffer, bufferPos, NULL);
UINT32 endPos = bufferPos + processedSize;
for (UINT32 curPos = 0; curPos + kStep <= endPos; curPos += kStep)
{
BYTE data[kStep];
data[0] = _buffer[curPos + 0];
data[1] = _buffer[curPos + 1];
data[2] = _buffer[curPos + 2];
data[3] = _buffer[curPos + 3];
_buffer[curPos + 0] = data[3];
_buffer[curPos + 1] = data[2];
_buffer[curPos + 2] = data[1];
_buffer[curPos + 3] = data[0];
}
RINOK(outStream->Write(_buffer, curPos, &processedSize));
if (curPos != processedSize)
return E_FAIL;
nowPos64 += curPos;
if (progress != NULL)
{
RINOK(progress->SetRatioInfo(&nowPos64, &nowPos64));
}
bufferPos = 0;
while(curPos < endPos)
_buffer[bufferPos++] = _buffer[curPos++];
Byte b0 = data[i];
Byte b1 = data[i + 1];
data[i] = data[i + 3];
data[i + 1] = data[i + 2];
data[i + 2] = b1;
data[i + 3] = b0;
}
return i;
}