implodedecoder.h

压缩软件源码

// ImplodeDecoder.h

#ifndef __IMPLODE_DECODER_H
#define __IMPLODE_DECODER_H

#include "../../../Common/MyCom.h"

#include "../../ICoder.h"
#include "../LZ/LZOutWindow.h"

#include "ImplodeHuffmanDecoder.h"

namespace NCompress {
namespace NImplode {
namespace NDecoder {

class CCoder :
  public ICompressCoder,
  public ICompressSetDecoderProperties2,
  public CMyUnknownImp
{
  CLZOutWindow m_OutWindowStream;
  NStream::NLSBF::CDecoder<CInBuffer> m_InBitStream;
  
  NImplode::NHuffman::CDecoder m_LiteralDecoder;
  NImplode::NHuffman::CDecoder m_LengthDecoder;
  NImplode::NHuffman::CDecoder m_DistanceDecoder;

  bool m_BigDictionaryOn;
  bool m_LiteralsOn;

  int m_NumDistanceLowDirectBits; 
  UInt32 m_MinMatchLength;

  void ReadLevelItems(NImplode::NHuffman::CDecoder &table, 
      Byte *levels, int numLevelItems);
  void ReadTables();
  void DeCodeLevelTable(Byte *newLevels, int numLevels);
public:
  CCoder();

  MY_UNKNOWN_IMP1(ICompressSetDecoderProperties2)

  void ReleaseStreams();
  HRESULT (Flush)() { return m_OutWindowStream.Flush(); }

  STDMETHOD(CodeReal)(ISequentialInStream *inStream, ISequentialOutStream *outStream, 
      const UInt64 *inSize, const UInt64 *outSize,
      ICompressProgressInfo *progress);

  STDMETHOD(Code)(ISequentialInStream *inStream, ISequentialOutStream *outStream, 
      const UInt64 *inSize, const UInt64 *outSize,
      ICompressProgressInfo *progress);

  // ICompressSetDecoderProperties
  STDMETHOD(SetDecoderProperties2)(const Byte *data, UInt32 size);
};

}}}

#endif