x86_2.h

一个7ZIP的解压源码。比较详细。里面含有四种语言的实现代码。

// x86_2.h

#ifndef __BRANCH_X86_2_H
#define __BRANCH_X86_2_H

#include "../../../Common/MyCom.h"
#include "../RangeCoder/RangeCoderBit.h"
#include "../../ICoder.h"

namespace NCompress {
namespace NBcj2 {

const int kNumMoveBits = 5;

#ifndef EXTRACT_ONLY

class CEncoder:
  public ICompressCoder2,
  public CMyUnknownImp
{
  Byte *_buffer;
public:
  CEncoder(): _buffer(0) {};
  ~CEncoder();
  bool Create();

  COutBuffer _mainStream;
  COutBuffer _callStream;
  COutBuffer _jumpStream;
  NCompress::NRangeCoder::CEncoder _rangeEncoder;
  NCompress::NRangeCoder::CBitEncoder<kNumMoveBits> _statusEncoder[256 + 2];

  HRESULT Flush();
  void ReleaseStreams()
  {
    _mainStream.ReleaseStream();
    _callStream.ReleaseStream();
    _jumpStream.ReleaseStream();
    _rangeEncoder.ReleaseStream();
  }

  class CCoderReleaser
  {
    CEncoder *_coder;
  public:
    CCoderReleaser(CEncoder *coder): _coder(coder) {}
    ~CCoderReleaser() {  _coder->ReleaseStreams(); }
  };

public: 

  MY_UNKNOWN_IMP

  HRESULT CodeReal(ISequentialInStream **inStreams,
      const UInt64 **inSizes,
      UInt32 numInStreams,
      ISequentialOutStream **outStreams,
      const UInt64 **outSizes,
      UInt32 numOutStreams,
      ICompressProgressInfo *progress);
  STDMETHOD(Code)(ISequentialInStream **inStreams,
      const UInt64 **inSizes,
      UInt32 numInStreams,
      ISequentialOutStream **outStreams,
      const UInt64 **outSizes,
      UInt32 numOutStreams,
      ICompressProgressInfo *progress);
}; 

#endif

class CDecoder:
  public ICompressCoder2,
  public CMyUnknownImp
{ 
public:
  CInBuffer _mainInStream;
  CInBuffer _callStream;
  CInBuffer _jumpStream;
  NCompress::NRangeCoder::CDecoder _rangeDecoder;
  NCompress::NRangeCoder::CBitDecoder<kNumMoveBits> _statusDecoder[256 + 2];

  COutBuffer _outStream;

  void ReleaseStreams()
  {
    _mainInStream.ReleaseStream();
    _callStream.ReleaseStream();
    _jumpStream.ReleaseStream();
    _rangeDecoder.ReleaseStream();
    _outStream.ReleaseStream();
  }

  HRESULT Flush() { return _outStream.Flush(); }
  class CCoderReleaser
  {
    CDecoder *_coder;
  public:
    CCoderReleaser(CDecoder *coder): _coder(coder) {}
    ~CCoderReleaser()  { _coder->ReleaseStreams(); }
  };

public: 
  MY_UNKNOWN_IMP
  HRESULT CodeReal(ISequentialInStream **inStreams,
      const UInt64 **inSizes,
      UInt32 numInStreams,
      ISequentialOutStream **outStreams,
      const UInt64 **outSizes,
      UInt32 numOutStreams,
      ICompressProgressInfo *progress);
  STDMETHOD(Code)(ISequentialInStream **inStreams,
      const UInt64 **inSizes,
      UInt32 numInStreams,
      ISequentialOutStream **outStreams,
      const UInt64 **outSizes,
      UInt32 numOutStreams,
      ICompressProgressInfo *progress);
}; 

}}

#endif