MultiMC5/depends/lzma/pavlov/LzFind.h

/* LzFind.h -- Match finder for LZ algorithms
2008-10-04 : Igor Pavlov : Public domain */

#ifndef __LZFIND_H
#define __LZFIND_H

#include "Types.h"

typedef uint32_t CLzRef;

typedef struct _CMatchFinder
{
	uint8_t *buffer;
	uint32_t pos;
	uint32_t posLimit;
	uint32_t streamPos;
	uint32_t lenLimit;

	uint32_t cyclicBufferPos;
	uint32_t cyclicBufferSize; /* it must be = (historySize + 1) */

	uint32_t matchMaxLen;
	CLzRef *hash;
	CLzRef *son;
	uint32_t hashMask;
	uint32_t cutValue;

	uint8_t *bufferBase;
	ISeqInStream *stream;
	int streamEndWasReached;

	uint32_t blockSize;
	uint32_t keepSizeBefore;
	uint32_t keepSizeAfter;

	uint32_t numHashBytes;
	int directInput;
	int btMode;
	/* int skipModeBits; */
	int bigHash;
	uint32_t historySize;
	uint32_t fixedHashSize;
	uint32_t hashSizeSum;
	uint32_t numSons;
	SRes result;
	uint32_t crc[256];
} CMatchFinder;

#define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer)
#define Inline_MatchFinder_GetIndexByte(p, index) ((p)->buffer[(Int32)(index)])

#define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos)

int MatchFinder_NeedMove(CMatchFinder *p);
uint8_t *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p);
void MatchFinder_MoveBlock(CMatchFinder *p);
void MatchFinder_ReadIfRequired(CMatchFinder *p);

void MatchFinder_Construct(CMatchFinder *p);

/* Conditions:
	 historySize <= 3 GB
	 keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB
*/
int MatchFinder_Create(CMatchFinder *p, uint32_t historySize, uint32_t keepAddBufferBefore,
					   uint32_t matchMaxLen, uint32_t keepAddBufferAfter);
void MatchFinder_Free(CMatchFinder *p);
void MatchFinder_Normalize3(uint32_t subValue, CLzRef *items, uint32_t numItems);
void MatchFinder_ReduceOffsets(CMatchFinder *p, uint32_t subValue);

uint32_t *GetMatchesSpec1(uint32_t lenLimit, uint32_t curMatch, uint32_t pos,
						  const uint8_t *buffer, CLzRef *son, uint32_t _cyclicBufferPos,
						  uint32_t _cyclicBufferSize, uint32_t _cutValue, uint32_t *distances,
						  uint32_t maxLen);

/*
Conditions:
  Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func.
  Mf_GetPointerToCurrentPos_Func's result must be used only before any other function
*/

typedef void (*Mf_Init_Func)(void *object);
typedef uint8_t (*Mf_GetIndexByte_Func)(void *object, int32_t index);
typedef uint32_t (*Mf_GetNumAvailableBytes_Func)(void *object);
typedef const uint8_t *(*Mf_GetPointerToCurrentPos_Func)(void *object);
typedef uint32_t (*Mf_GetMatches_Func)(void *object, uint32_t *distances);
typedef void (*Mf_Skip_Func)(void *object, uint32_t);

typedef struct _IMatchFinder
{
	Mf_Init_Func Init;
	Mf_GetIndexByte_Func GetIndexByte;
	Mf_GetNumAvailableBytes_Func GetNumAvailableBytes;
	Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos;
	Mf_GetMatches_Func GetMatches;
	Mf_Skip_Func Skip;
} IMatchFinder;

void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder *vTable);

void MatchFinder_Init(CMatchFinder *p);
uint32_t Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, uint32_t *distances);
uint32_t Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, uint32_t *distances);
void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, uint32_t num);
void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, uint32_t num);

#endif