75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
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// 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 unsigned kMatchMinLen = 3;
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const unsigned kMatchMaxLen = 256;
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const unsigned NC = (256 + kMatchMaxLen - kMatchMinLen + 1);
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const unsigned NUM_CODE_BITS = 16;
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const unsigned NUM_DIC_BITS_MAX = 25;
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const unsigned NT = (NUM_CODE_BITS + 3);
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const unsigned NP = (NUM_DIC_BITS_MAX + 1);
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const unsigned NPT = NP; // Max(NT, NP)
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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 _outWindow;
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NBitm::CDecoder<CInBuffer> _inBitStream;
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int _symbolT;
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int _symbolC;
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NHuffman::CDecoder<NUM_CODE_BITS, NPT> _decoderT;
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NHuffman::CDecoder<NUM_CODE_BITS, NC> _decoderC;
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class CCoderReleaser
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{
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CCoder *_coder;
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public:
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CCoderReleaser(CCoder *coder): _coder(coder) {}
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void Disable() { _coder = NULL; }
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~CCoderReleaser() { if (_coder) _coder->_outWindow.Flush(); }
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};
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friend class CCoderReleaser;
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bool ReadTP(unsigned num, unsigned numBits, int spec);
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bool ReadC();
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HRESULT CodeReal(UInt64 outSize, ICompressProgressInfo *progress);
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public:
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MY_UNKNOWN_IMP
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UInt32 DictSize;
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bool FinishMode;
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STDMETHOD(Code)(ISequentialInStream *inStream, ISequentialOutStream *outStream,
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const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress);
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void SetDictSize(unsigned dictSize) { DictSize = dictSize; }
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CCoder(): DictSize(1 << 16), FinishMode(false) {}
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UInt64 GetInputProcessedSize() const { return _inBitStream.GetProcessedSize(); }
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};
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}}}
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#endif
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