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// Archive/Cab/LZXDecoder.h
#ifndef __ARCHIVE_CAB_LZXDECODER_H
#define __ARCHIVE_CAB_LZXDECODER_H
#include "../../ICoder.h"
#include "../../Compress/Huffman/HuffmanDecoder.h"
#include "../../Compress/LZ/LZOutWindow.h"
#include "LZXExtConst.h"
#include "LZXBitDecoder.h"
#include "LZXi86Converter.h"
#include "LZXConst.h"
namespace NArchive {
namespace NCab {
namespace NLZX {
const int kMainTableSize = 256 + kNumPosSlotLenSlotSymbols;
class CDecoder :
public ICompressCoder,
public CMyUnknownImp
{
CLZOutWindow m_OutWindowStream;
NBitStream::CDecoder m_InBitStream;
NCompress::NHuffman::CDecoder<kNumHuffmanBits, kMainTableSize> m_MainDecoder;
NCompress::NHuffman::CDecoder<kNumHuffmanBits, kNumLenSymbols> m_LenDecoder;
NCompress::NHuffman::CDecoder<kNumHuffmanBits, kAlignTableSize> m_AlignDecoder;
NCompress::NHuffman::CDecoder<kNumHuffmanBits, kLevelTableSize> m_LevelDecoder;
UInt32 m_RepDistances[kNumRepDistances];
Byte m_LastByteLevels[256];
Byte m_LastPosLenLevels[kNumPosSlotLenSlotSymbols];
Byte m_LastLenLevels[kNumLenSymbols];
UInt32 m_DictionarySizePowerOf2;
UInt32 m_NumPosSlots;
UInt32 m_NumPosLenSlots;
// bool m_i86PreprocessingUsed;
// UInt32 m_i86TranslationSize;
bool m_UncompressedBlock;
bool m_AlignIsUsed;
UInt32 m_UnCompressedBlockSize;
Ci86TranslationOutStream *m_i86TranslationOutStreamSpec;
CMyComPtr<ISequentialOutStream> m_i86TranslationOutStream;
Byte m_ReservedSize;
UInt32 m_NumInDataBlocks;
void ReadTable(Byte *lastLevels, Byte *newLevels, UInt32 numSymbols);
void ReadTables();
void ClearPrevLeveles();
public:
CDecoder();
MY_UNKNOWN_IMP
void ReleaseStreams();
STDMETHOD(Flush)();
// ICompressCoder interface
STDMETHOD(Code)(ISequentialInStream *inStream,
ISequentialOutStream *outStream,
const UInt64 *inSize, const UInt64 *outSize,
ICompressProgressInfo *progress);
void SetParams(Byte reservedSize, UInt32 numInDataBlocks,
UInt32 dictionarySizePowerOf2)
{
m_ReservedSize = reservedSize;
m_NumInDataBlocks = numInDataBlocks;
m_DictionarySizePowerOf2 = dictionarySizePowerOf2;
if (dictionarySizePowerOf2 < 20)
m_NumPosSlots = 30 + (dictionarySizePowerOf2 - 15) * 2;
else if (dictionarySizePowerOf2 == 20)
m_NumPosSlots = 42;
else
m_NumPosSlots = 50;
m_NumPosLenSlots = m_NumPosSlots * kNumLenSlots;
}
};
}}}
#endif
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