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91 lines
2.0 KiB
C++
91 lines
2.0 KiB
C++
// Lzx86Converter.cpp
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#include "StdAfx.h"
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#include "../../Common/Defs.h"
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#include "Lzx86Converter.h"
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namespace NCompress {
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namespace NLzx {
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static const UInt32 kResidue = 6 + 4;
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void Cx86ConvertOutStream::MakeTranslation()
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{
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if (_pos <= kResidue)
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return;
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UInt32 numBytes = _pos - kResidue;
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Byte *buf = _buf;
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for (UInt32 i = 0; i < numBytes;)
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{
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if (buf[i++] == 0xE8)
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{
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Int32 absValue = 0;
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unsigned j;
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for (j = 0; j < 4; j++)
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absValue += (UInt32)buf[i + j] << (j * 8);
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Int32 pos = (Int32)(_processedSize + i - 1);
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if (absValue >= -pos && absValue < (Int32)_translationSize)
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{
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UInt32 offset = (absValue >= 0) ?
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absValue - pos :
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absValue + _translationSize;
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for (j = 0; j < 4; j++)
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{
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buf[i + j] = (Byte)(offset & 0xFF);
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offset >>= 8;
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}
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}
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i += 4;
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}
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}
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}
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STDMETHODIMP Cx86ConvertOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
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{
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if (processedSize)
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*processedSize = 0;
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if (!_translationMode)
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return _stream->Write(data, size, processedSize);
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UInt32 realProcessedSize = 0;
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while (realProcessedSize < size)
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{
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UInt32 writeSize = MyMin(size - realProcessedSize, kUncompressedBlockSize - _pos);
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memcpy(_buf + _pos, (const Byte *)data + realProcessedSize, writeSize);
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_pos += writeSize;
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realProcessedSize += writeSize;
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if (_pos == kUncompressedBlockSize)
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{
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RINOK(Flush());
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}
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}
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if (processedSize)
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*processedSize = realProcessedSize;
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return S_OK;
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}
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HRESULT Cx86ConvertOutStream::Flush()
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{
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if (_pos == 0)
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return S_OK;
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if (_translationMode)
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MakeTranslation();
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UInt32 pos = 0;
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do
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{
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UInt32 processed;
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RINOK(_stream->Write(_buf + pos, _pos - pos, &processed));
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if (processed == 0)
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return E_FAIL;
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pos += processed;
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}
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while (pos < _pos);
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_processedSize += _pos;
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_pos = 0;
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_translationMode = (_translationMode && (_processedSize < ((UInt32)1 << 30)));
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return S_OK;
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}
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}}
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