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107 lines
2.4 KiB
C++
Executable File
107 lines
2.4 KiB
C++
Executable File
// LzhDecoder.h
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#ifndef __COMPRESS_LZH_DECODER_H
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#define __COMPRESS_LZH_DECODER_H
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#include "../../Common/MyCom.h"
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#include "../ICoder.h"
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#include "../Common/InBuffer.h"
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#include "BitmDecoder.h"
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#include "HuffmanDecoder.h"
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#include "LzOutWindow.h"
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namespace NCompress {
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namespace NLzh {
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namespace NDecoder {
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const int kMaxHuffmanLen = 16; // Check it
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const int kNumSpecLevelSymbols = 3;
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const int kNumLevelSymbols = kNumSpecLevelSymbols + kMaxHuffmanLen;
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const int kDictBitsMax = 16;
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const int kNumDistanceSymbols = kDictBitsMax + 1;
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const int kMaxMatch = 256;
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const int kMinMatch = 3;
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const int kNumCSymbols = 256 + kMaxMatch + 2 - kMinMatch;
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template <UInt32 m_NumSymbols>
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class CHuffmanDecoder:public NCompress::NHuffman::CDecoder<kMaxHuffmanLen, m_NumSymbols>
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{
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public:
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int Symbol;
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template <class TBitDecoder>
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UInt32 Decode(TBitDecoder *bitStream)
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{
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if (Symbol >= 0)
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return (UInt32)Symbol;
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return DecodeSymbol(bitStream);
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}
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};
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class CCoder :
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public ICompressCoder,
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public CMyUnknownImp
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{
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CLzOutWindow m_OutWindowStream;
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NBitm::CDecoder<CInBuffer> m_InBitStream;
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int m_NumDictBits;
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CHuffmanDecoder<kNumLevelSymbols> m_LevelHuffman;
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CHuffmanDecoder<kNumDistanceSymbols> m_PHuffmanDecoder;
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CHuffmanDecoder<kNumCSymbols> m_CHuffmanDecoder;
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void ReleaseStreams()
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{
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m_OutWindowStream.ReleaseStream();
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m_InBitStream.ReleaseStream();
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}
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class CCoderReleaser
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{
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CCoder *m_Coder;
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public:
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bool NeedFlush;
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CCoderReleaser(CCoder *coder): m_Coder(coder), NeedFlush(true) {}
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~CCoderReleaser()
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{
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if (NeedFlush)
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m_Coder->m_OutWindowStream.Flush();
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m_Coder->ReleaseStreams();
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}
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};
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friend class CCoderReleaser;
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void MakeTable(int nchar, Byte *bitlen, int tablebits,
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UInt32 *table, int tablesize);
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UInt32 ReadBits(int numBits);
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HRESULT ReadLevelTable();
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HRESULT ReadPTable(int numBits);
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HRESULT ReadCTable();
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public:
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MY_UNKNOWN_IMP
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STDMETHOD(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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STDMETHOD(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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void SetDictionary(int numDictBits) { m_NumDictBits = numDictBits; }
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CCoder(): m_NumDictBits(0) {}
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};
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}}}
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#endif
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