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// LZMA.h
// #pragma once
#include "LZMALen.h"
#ifndef __LZMA_H
#define __LZMA_H
namespace NCompress {
namespace NLZMA {
const UINT32 kNumRepDistances = 4;
const BYTE kNumStates = 12;
const BYTE kLiteralNextStates[kNumStates] = {0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5};
const BYTE kMatchNextStates[kNumStates] = {7, 7, 7, 7, 7, 7, 7, 10, 10, 10, 10, 10};
const BYTE kRepNextStates[kNumStates] = {8, 8, 8, 8, 8, 8, 8, 11, 11, 11, 11, 11};
const BYTE kShortRepNextStates[kNumStates]= {9, 9, 9, 9, 9, 9, 9, 11, 11, 11, 11, 11};
class CState
{
public:
BYTE Index;
void Init()
{ Index = 0; }
void UpdateChar()
{ Index = kLiteralNextStates[Index]; }
void UpdateMatch()
{ Index = kMatchNextStates[Index]; }
void UpdateRep()
{ Index = kRepNextStates[Index]; }
void UpdateShortRep()
{ Index = kShortRepNextStates[Index]; }
};
class CBaseCoder
{
protected:
CState _state;
BYTE _previousByte;
bool _peviousIsMatch;
UINT32 _repDistances[kNumRepDistances];
void Init()
{
_state.Init();
_previousByte = 0;
_peviousIsMatch = false;
for(int i = 0 ; i < kNumRepDistances; i++)
_repDistances[i] = 0;
}
};
const int kNumPosSlotBits = 6;
const int kDicLogSizeMin = 0;
const int kDicLogSizeMax = 32;
const int kDistTableSizeMax = kDicLogSizeMax * 2;
const UINT32 kNumLenToPosStates = 4;
inline UINT32 GetLenToPosState(UINT32 len)
{
len -= 2;
if (len < kNumLenToPosStates)
return len;
return kNumLenToPosStates - 1;
}
const UINT32 kMatchMinLen = 2;
const UINT32 kMatchMaxLen = kMatchMinLen + NLength::kNumSymbolsTotal - 1;
const int kNumAlignBits = 4;
const UINT32 kAlignTableSize = 1 << kNumAlignBits;
const UINT32 kAlignMask = (kAlignTableSize - 1);
const UINT32 kStartPosModelIndex = 4;
const UINT32 kEndPosModelIndex = 14;
const UINT32 kNumPosModels = kEndPosModelIndex - kStartPosModelIndex;
const UINT32 kNumFullDistances = 1 << (kEndPosModelIndex / 2);
const UINT32 kMainChoiceLiteralIndex = 0;
const UINT32 kMainChoiceMatchIndex = 1;
const UINT32 kMatchChoiceDistanceIndex= 0;
const UINT32 kMatchChoiceRepetitionIndex = 1;
const int kNumMoveBits = 5;
const int kNumLitPosStatesBitsEncodingMax = 4;
const int kNumLitContextBitsMax = 8;
}}
#endif
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