Simone
d074cc7c07
Plugin: ns7zip v2.0.0 Architectures: x86-ansi, x86-unicode, amd64-unicode License: LGPL-2.1-or-later
61 lines
1.4 KiB
C++
61 lines
1.4 KiB
C++
// QuantumDecoder.h
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#ifndef ZIP7_INC_COMPRESS_QUANTUM_DECODER_H
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#define ZIP7_INC_COMPRESS_QUANTUM_DECODER_H
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#include "../../Common/MyTypes.h"
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namespace NCompress {
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namespace NQuantum {
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const unsigned kNumLitSelectorBits = 2;
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const unsigned kNumLitSelectors = 1 << kNumLitSelectorBits;
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const unsigned kNumLitSymbols = 1 << (8 - kNumLitSelectorBits);
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const unsigned kNumMatchSelectors = 3;
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const unsigned kNumSelectors = kNumLitSelectors + kNumMatchSelectors;
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const unsigned kNumSymbolsMax = kNumLitSymbols; // 64
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class CRangeDecoder;
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class CModelDecoder
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{
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unsigned NumItems;
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unsigned ReorderCount;
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Byte Vals[kNumSymbolsMax];
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UInt16 Freqs[kNumSymbolsMax + 1];
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public:
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Byte _pad[64 - 10]; // for structure size alignment
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void Init(unsigned numItems, unsigned startVal);
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unsigned Decode(CRangeDecoder *rc);
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};
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class CDecoder
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{
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UInt32 _winSize;
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UInt32 _winPos;
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UInt32 _winSize_allocated;
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bool _overWin;
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Byte *_win;
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unsigned _numDictBits;
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CModelDecoder m_Selector;
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CModelDecoder m_Literals[kNumLitSelectors];
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CModelDecoder m_PosSlot[kNumMatchSelectors];
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CModelDecoder m_LenSlot;
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void Init();
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HRESULT CodeSpec(const Byte *inData, size_t inSize, UInt32 outSize);
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public:
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HRESULT Code(const Byte *inData, size_t inSize, UInt32 outSize, bool keepHistory);
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HRESULT SetParams(unsigned numDictBits);
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CDecoder(): _win(NULL), _numDictBits(0) {}
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const Byte * GetDataPtr() const { return _win + _winPos; }
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};
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}}
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#endif
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