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96 lines
2.3 KiB
C++
Executable File
96 lines
2.3 KiB
C++
Executable File
// Arj/Decoder2.cpp
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#include "StdAfx.h"
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#include "Decoder2.h"
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#include "Windows/Defs.h"
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namespace NCompress{
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namespace NArj {
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namespace NDecoder2 {
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static const UINT32 kHistorySize = 26624;
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static const UINT32 kMatchMaxLen = 256;
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static const UINT32 kMatchMinLen = 3;
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CCoder::CCoder()
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{}
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STDMETHODIMP CCoder::CodeReal(ISequentialInStream *inStream,
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ISequentialOutStream *outStream, const UINT64 *inSize, const UINT64 *outSize,
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ICompressProgressInfo *progress)
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{
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if (outSize == NULL)
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return E_INVALIDARG;
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if (!m_OutWindowStream.IsCreated())
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{
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try { m_OutWindowStream.Create(kHistorySize); }
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catch(...) { return E_OUTOFMEMORY; }
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}
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UINT64 pos = 0;
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m_OutWindowStream.Init(outStream, false);
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m_InBitStream.Init(inStream);
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CCoderReleaser coderReleaser(this);
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while(pos < *outSize)
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{
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const UINT32 kStartWidth = 0;
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const UINT32 kStopWidth = 7;
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UINT32 power = 1 << kStartWidth;
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UINT32 width;
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UINT32 len = 0;
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for (width = kStartWidth; width < kStopWidth; width++)
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{
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if (m_InBitStream.ReadBits(1) == 0)
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break;
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len += power;
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power <<= 1;
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}
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if (width != 0)
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len += m_InBitStream.ReadBits(width);
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if (len == 0)
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{
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m_OutWindowStream.PutOneByte(m_InBitStream.ReadBits(8));
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pos++;
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continue;
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}
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else
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{
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len = len - 1 + kMatchMinLen;
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const UINT32 kStartWidth = 9;
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const UINT32 kStopWidth = 13;
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UINT32 power = 1 << kStartWidth;
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UINT32 width;
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UINT32 distance = 0;
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for (width = kStartWidth; width < kStopWidth; width++)
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{
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if (m_InBitStream.ReadBits(1) == 0)
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break;
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distance += power;
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power <<= 1;
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}
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if (width != 0)
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distance += m_InBitStream.ReadBits(width);
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if (distance >= pos)
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throw "data error";
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m_OutWindowStream.CopyBackBlock(distance, len);
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pos += len;
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}
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}
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return m_OutWindowStream.Flush();
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}
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STDMETHODIMP CCoder::Code(ISequentialInStream *inStream,
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ISequentialOutStream *outStream, const UINT64 *inSize, const UINT64 *outSize,
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ICompressProgressInfo *progress)
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{
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try { return CodeReal(inStream, outStream, inSize, outSize, progress);}
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catch(const CInBufferException &e) { return e.ErrorCode; }
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catch(const CLZOutWindowException &e) { return e.ErrorCode; }
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catch(...) { return S_FALSE; }
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}
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}}}
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