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// Lzx86Converter.cpp
#include "StdAfx.h"
#include "../../Common/Defs.h"
#include "Lzx86Converter.h"
namespace NCompress {
namespace NLzx {
static const int kResidue = 6 + 4;
void Cx86ConvertOutStream::MakeTranslation()
{
if (m_Pos <= kResidue)
return;
UInt32 numBytes = m_Pos - kResidue;
Byte *buffer = m_Buffer;
for (UInt32 i = 0; i < numBytes;)
{
if (buffer[i++] == 0xE8)
{
Int32 absValue = 0;
int j;
for(j = 0; j < 4; j++)
absValue += (UInt32)buffer[i + j] << (j * 8);
Int32 pos = (Int32)(m_ProcessedSize + i - 1);
if (absValue >= -pos && absValue < (Int32)m_TranslationSize)
{
UInt32 offset = (absValue >= 0) ?
absValue - pos :
absValue + m_TranslationSize;
for(j = 0; j < 4; j++)
{
buffer[i + j] = (Byte)(offset & 0xFF);
offset >>= 8;
}
}
i += 4;
}
}
}
STDMETHODIMP Cx86ConvertOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
if (processedSize != NULL)
*processedSize = 0;
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;
}
HRESULT Cx86ConvertOutStream::Flush()
{
if (m_Pos == 0)
return S_OK;
if (m_TranslationMode)
MakeTranslation();
UInt32 pos = 0;
do
{
UInt32 processed;
RINOK(m_Stream->Write(m_Buffer + pos, m_Pos - pos, &processed));
if (processed == 0)
return E_FAIL;
pos += processed;
}
while(pos < m_Pos);
m_ProcessedSize += m_Pos;
m_Pos = 0;
m_TranslationMode = (m_TranslationMode && (m_ProcessedSize < (1 << 30)));
return S_OK;
}
}}
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