83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
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// LZMA.h
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#ifndef __LZMA_H
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#define __LZMA_H
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namespace NCompress {
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namespace NLZMA {
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const UInt32 kNumRepDistances = 4;
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const int kNumStates = 12;
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const Byte kLiteralNextStates[kNumStates] = {0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5};
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const Byte kMatchNextStates[kNumStates] = {7, 7, 7, 7, 7, 7, 7, 10, 10, 10, 10, 10};
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const Byte kRepNextStates[kNumStates] = {8, 8, 8, 8, 8, 8, 8, 11, 11, 11, 11, 11};
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const Byte kShortRepNextStates[kNumStates]= {9, 9, 9, 9, 9, 9, 9, 11, 11, 11, 11, 11};
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class CState
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{
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public:
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Byte Index;
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void Init() { Index = 0; }
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void UpdateChar() { Index = kLiteralNextStates[Index]; }
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void UpdateMatch() { Index = kMatchNextStates[Index]; }
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void UpdateRep() { Index = kRepNextStates[Index]; }
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void UpdateShortRep() { Index = kShortRepNextStates[Index]; }
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bool IsCharState() const { return Index < 7; }
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};
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const int kNumPosSlotBits = 6;
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const int kDicLogSizeMin = 0;
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const int kDicLogSizeMax = 32;
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const int kDistTableSizeMax = kDicLogSizeMax * 2;
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const UInt32 kNumLenToPosStates = 4;
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inline UInt32 GetLenToPosState(UInt32 len)
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{
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len -= 2;
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if (len < kNumLenToPosStates)
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return len;
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return kNumLenToPosStates - 1;
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}
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namespace NLength {
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const int kNumPosStatesBitsMax = 4;
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const UInt32 kNumPosStatesMax = (1 << kNumPosStatesBitsMax);
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const int kNumPosStatesBitsEncodingMax = 4;
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const UInt32 kNumPosStatesEncodingMax = (1 << kNumPosStatesBitsEncodingMax);
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const int kNumLowBits = 3;
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const int kNumMidBits = 3;
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const int kNumHighBits = 8;
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const UInt32 kNumLowSymbols = 1 << kNumLowBits;
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const UInt32 kNumMidSymbols = 1 << kNumMidBits;
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const UInt32 kNumSymbolsTotal = kNumLowSymbols + kNumMidSymbols + (1 << kNumHighBits);
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}
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const UInt32 kMatchMinLen = 2;
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const UInt32 kMatchMaxLen = kMatchMinLen + NLength::kNumSymbolsTotal - 1;
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const int kNumAlignBits = 4;
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const UInt32 kAlignTableSize = 1 << kNumAlignBits;
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const UInt32 kAlignMask = (kAlignTableSize - 1);
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const UInt32 kStartPosModelIndex = 4;
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const UInt32 kEndPosModelIndex = 14;
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const UInt32 kNumPosModels = kEndPosModelIndex - kStartPosModelIndex;
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const UInt32 kNumFullDistances = 1 << (kEndPosModelIndex / 2);
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const int kNumLitPosStatesBitsEncodingMax = 4;
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const int kNumLitContextBitsMax = 8;
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const int kNumMoveBits = 5;
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}}
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#endif
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