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// Archive/Cab/LZXi86Converter.cpp
#include "StdAfx.h"
#include "Common/Defs.h"
#include "LZXi86Converter.h"
namespace NArchive {
namespace NCab {
namespace NLZX {
static const int kResidue = 6 + 4;
void Ci86TranslationOutStream::MakeTranslation()
{
if (m_Pos <= kResidue)
return;
UInt32 numBytes = m_Pos - kResidue;
for (UInt32 i = 0; i < numBytes;)
{
if (m_Buffer[i] == 0xE8)
{
i++;
Int32 absValue = 0;
int j;
for(j = 0; j < 4; j++)
absValue += UInt32(m_Buffer[i + j]) << (j * 8);
Int32 pos = m_ProcessedSize + i - 1;
UInt32 offset;
if (absValue < -pos || absValue >= Int32(m_TranslationSize))
{
}
else
{
offset = (absValue >= 0) ?
absValue - pos :
absValue + m_TranslationSize;
for(j = 0; j < 4; j++)
{
m_Buffer[i + j] = Byte(offset & 0xFF);
offset >>= 8;
}
}
i += 4;
}
else
i++;
}
}
STDMETHODIMP Ci86TranslationOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
if (!m_TranslationMode)
return m_Stream->Write(data, size, processedSize);
UInt32 realProcessedSize = 0;
while (realProcessedSize < size)
{
UInt32 writeSize = MyMin(size - realProcessedSize, kUncompressedBlockSize - m_Pos);
memmove(m_Buffer + m_Pos, (const Byte *)data + realProcessedSize, writeSize);
m_Pos += writeSize;
realProcessedSize += writeSize;
if (m_Pos == kUncompressedBlockSize)
{
RINOK(Flush());
}
}
if (processedSize != NULL)
*processedSize = realProcessedSize;
return S_OK;
}
STDMETHODIMP Ci86TranslationOutStream::WritePart(const void *data, UInt32 size, UInt32 *processedSize)
{
return Write(data, size, processedSize);
}
HRESULT Ci86TranslationOutStream::Flush()
{
if (m_Pos == 0)
return S_OK;
MakeTranslation();
RINOK(m_Stream->Write(m_Buffer, m_Pos, NULL));
m_ProcessedSize += m_Pos;
m_Pos = 0;
m_TranslationMode = (m_ProcessedSize < (1 << 30));
return S_OK;
}
}}}
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