mirror of https://github.com/snes9xgit/snes9x.git
125 lines
3.4 KiB
C++
125 lines
3.4 KiB
C++
/*
|
|
Copyright (C) 2005-2006 NSRT Team ( http://nsrt.edgeemu.com )
|
|
Copyright (C) 2002 Andrea Mazzoleni ( http://advancemame.sf.net )
|
|
Copyright (C) 2001-4 Igor Pavlov ( http://www.7-zip.org )
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License version 2.1 as published by the Free Software Foundation.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with this library; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include "lencoder.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 m_Index;
|
|
void Init()
|
|
{ m_Index = 0; }
|
|
void UpdateChar()
|
|
{ m_Index = kLiteralNextStates[m_Index]; }
|
|
void UpdateMatch()
|
|
{ m_Index = kMatchNextStates[m_Index]; }
|
|
void UpdateRep()
|
|
{ m_Index = kRepNextStates[m_Index]; }
|
|
void UpdateShortRep()
|
|
{ m_Index = kShortRepNextStates[m_Index]; }
|
|
};
|
|
|
|
class CBaseCoder
|
|
{
|
|
protected:
|
|
CState m_State;
|
|
BYTE m_PreviousByte;
|
|
bool m_PeviousIsMatch;
|
|
UINT32 m_RepDistances[kNumRepDistances];
|
|
void Init()
|
|
{
|
|
m_State.Init();
|
|
m_PreviousByte = 0;
|
|
m_PeviousIsMatch = false;
|
|
for(UINT32 i = 0 ; i < kNumRepDistances; i++)
|
|
m_RepDistances[i] = 0;
|
|
}
|
|
};
|
|
|
|
const int kNumPosSlotBits = 6;
|
|
const int kDicLogSizeMax = 28;
|
|
const int kDistTableSizeMax = kDicLogSizeMax * 2;
|
|
|
|
extern UINT32 kDistStart[kDistTableSizeMax];
|
|
const BYTE kDistDirectBits[kDistTableSizeMax] =
|
|
{
|
|
0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9,
|
|
10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19,
|
|
20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26
|
|
};
|
|
|
|
const UINT32 kNumLenToPosStates = 4;
|
|
inline UINT32 GetLenToPosState(UINT32 aLen)
|
|
{
|
|
aLen -= 2;
|
|
if (aLen < kNumLenToPosStates)
|
|
return aLen;
|
|
return kNumLenToPosStates - 1;
|
|
}
|
|
|
|
const int kMatchMinLen = 2;
|
|
|
|
const int kMatchMaxLen = kMatchMinLen + NLength::kNumSymbolsTotal - 1;
|
|
|
|
const int kNumAlignBits = 4;
|
|
const int kAlignTableSize = 1 << kNumAlignBits;
|
|
const UINT32 kAlignMask = (kAlignTableSize - 1);
|
|
|
|
const int kStartPosModelIndex = 4;
|
|
const int kEndPosModelIndex = 14;
|
|
const int kNumPosModels = kEndPosModelIndex - kStartPosModelIndex;
|
|
|
|
const int kNumFullDistances = 1 << (kEndPosModelIndex / 2);
|
|
|
|
|
|
const int kMainChoiceLiteralIndex = 0;
|
|
const int kMainChoiceMatchIndex = 1;
|
|
|
|
const int kMatchChoiceDistanceIndex= 0;
|
|
const int kMatchChoiceRepetitionIndex = 1;
|
|
|
|
const int kNumMoveBitsForMainChoice = 5;
|
|
const int kNumMoveBitsForPosCoders = 5;
|
|
|
|
const int kNumMoveBitsForAlignCoders = 5;
|
|
|
|
const int kNumMoveBitsForPosSlotCoder = 5;
|
|
|
|
const int kNumLitPosStatesBitsEncodingMax = 4;
|
|
const int kNumLitContextBitsMax = 8;
|
|
|
|
}}
|
|
|
|
#endif
|