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/* 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
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