CPP/7zip/Compress/LzmaDecoder.h

// LzmaDecoder.h

#ifndef ZIP7_INC_LZMA_DECODER_H
#define ZIP7_INC_LZMA_DECODER_H

// #include "../../../C/Alloc.h"
#include "../../../C/LzmaDec.h"

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

namespace NCompress {
namespace NLzma {

class CDecoder Z7_final:
  public ICompressCoder,
  public ICompressSetDecoderProperties2,
  public ICompressSetFinishMode,
  public ICompressGetInStreamProcessedSize,
  public ICompressSetBufSize,
 #ifndef Z7_NO_READ_FROM_CODER
  public ICompressSetInStream,
  public ICompressSetOutStreamSize,
  public ISequentialInStream,
 #endif
  public CMyUnknownImp
{
  Z7_COM_QI_BEGIN2(ICompressCoder)
  Z7_COM_QI_ENTRY(ICompressSetDecoderProperties2)
  Z7_COM_QI_ENTRY(ICompressSetFinishMode)
  Z7_COM_QI_ENTRY(ICompressGetInStreamProcessedSize)
  Z7_COM_QI_ENTRY(ICompressSetBufSize)
 #ifndef Z7_NO_READ_FROM_CODER
  Z7_COM_QI_ENTRY(ICompressSetInStream)
  Z7_COM_QI_ENTRY(ICompressSetOutStreamSize)
  Z7_COM_QI_ENTRY(ISequentialInStream)
 #endif
  Z7_COM_QI_END
  Z7_COM_ADDREF_RELEASE

  Z7_IFACE_COM7_IMP(ICompressCoder)
public:
  Z7_IFACE_COM7_IMP(ICompressSetDecoderProperties2)
private:
  Z7_IFACE_COM7_IMP(ICompressSetFinishMode)
  Z7_IFACE_COM7_IMP(ICompressGetInStreamProcessedSize)
  // Z7_IFACE_COM7_IMP(ICompressSetOutStreamSize)

  Z7_IFACE_COM7_IMP(ICompressSetBufSize)

 #ifndef Z7_NO_READ_FROM_CODER
public:
  Z7_IFACE_COM7_IMP(ICompressSetInStream)
private:
  Z7_IFACE_COM7_IMP(ISequentialInStream)
  Z7_IFACE_COM7_IMP(ICompressSetOutStreamSize)
 #else
  Z7_COM7F_IMF(SetOutStreamSize(const UInt64 *outSize));
 #endif

public:
  bool FinishStream; // set it before decoding, if you need to decode full LZMA stream
private:
  bool _propsWereSet;
  bool _outSizeDefined;

  UInt32 _outStep;
  UInt32 _inBufSize;
  UInt32 _inBufSizeNew;

  ELzmaStatus _lzmaStatus;
  UInt32 _inPos;
  UInt32 _inLim;
  Byte *_inBuf;
 
  UInt64 _outSize;
  UInt64 _inProcessed;
  UInt64 _outProcessed;

  // CAlignOffsetAlloc _alloc;

  CLzmaDec _state;

  HRESULT CreateInputBuffer();
  HRESULT CodeSpec(ISequentialInStream *inStream, ISequentialOutStream *outStream, ICompressProgressInfo *progress);
  void SetOutStreamSizeResume(const UInt64 *outSize);

 #ifndef Z7_NO_READ_FROM_CODER
private:
  CMyComPtr<ISequentialInStream> _inStream;
public:
  HRESULT CodeResume(ISequentialOutStream *outStream, const UInt64 *outSize, ICompressProgressInfo *progress);
  HRESULT ReadFromInputStream(void *data, UInt32 size, UInt32 *processedSize);
 #endif

public:
  CDecoder();
  ~CDecoder();

  UInt64 GetInputProcessedSize() const { return _inProcessed; }
  UInt64 GetOutputProcessedSize() const { return _outProcessed; }
  bool NeedsMoreInput() const { return _lzmaStatus == LZMA_STATUS_NEEDS_MORE_INPUT; }
  bool CheckFinishStatus(bool withEndMark) const
  {
    return _lzmaStatus == (withEndMark ?
        LZMA_STATUS_FINISHED_WITH_MARK :
        LZMA_STATUS_MAYBE_FINISHED_WITHOUT_MARK);
  }
};

}}

#endif