118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/* LzFind.h -- Match finder for LZ algorithms
|
|
2015-10-15 : Igor Pavlov : Public domain */
|
|
|
|
#ifndef __LZ_FIND_H
|
|
#define __LZ_FIND_H
|
|
|
|
#include "7zTypes.h"
|
|
|
|
EXTERN_C_BEGIN
|
|
|
|
typedef UInt32 CLzRef;
|
|
|
|
typedef struct _CMatchFinder
|
|
{
|
|
Byte *buffer;
|
|
UInt32 pos;
|
|
UInt32 posLimit;
|
|
UInt32 streamPos;
|
|
UInt32 lenLimit;
|
|
|
|
UInt32 cyclicBufferPos;
|
|
UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */
|
|
|
|
Byte streamEndWasReached;
|
|
Byte btMode;
|
|
Byte bigHash;
|
|
Byte directInput;
|
|
|
|
UInt32 matchMaxLen;
|
|
CLzRef *hash;
|
|
CLzRef *son;
|
|
UInt32 hashMask;
|
|
UInt32 cutValue;
|
|
|
|
Byte *bufferBase;
|
|
ISeqInStream *stream;
|
|
|
|
UInt32 blockSize;
|
|
UInt32 keepSizeBefore;
|
|
UInt32 keepSizeAfter;
|
|
|
|
UInt32 numHashBytes;
|
|
size_t directInputRem;
|
|
UInt32 historySize;
|
|
UInt32 fixedHashSize;
|
|
UInt32 hashSizeSum;
|
|
SRes result;
|
|
UInt32 crc[256];
|
|
size_t numRefs;
|
|
} CMatchFinder;
|
|
|
|
#define Inline_MatchFinder_GetPointerToCurrentPos(p) ((p)->buffer)
|
|
|
|
#define Inline_MatchFinder_GetNumAvailableBytes(p) ((p)->streamPos - (p)->pos)
|
|
|
|
#define Inline_MatchFinder_IsFinishedOK(p) \
|
|
((p)->streamEndWasReached \
|
|
&& (p)->streamPos == (p)->pos \
|
|
&& (!(p)->directInput || (p)->directInputRem == 0))
|
|
|
|
int MatchFinder_NeedMove(CMatchFinder *p);
|
|
Byte *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 historySize,
|
|
UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter,
|
|
ISzAlloc *alloc);
|
|
void MatchFinder_Free(CMatchFinder *p, ISzAlloc *alloc);
|
|
void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, size_t numItems);
|
|
void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue);
|
|
|
|
UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *buffer, CLzRef *son,
|
|
UInt32 _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue,
|
|
UInt32 *distances, UInt32 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 UInt32 (*Mf_GetNumAvailableBytes_Func)(void *object);
|
|
typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object);
|
|
typedef UInt32 (*Mf_GetMatches_Func)(void *object, UInt32 *distances);
|
|
typedef void (*Mf_Skip_Func)(void *object, UInt32);
|
|
|
|
typedef struct _IMatchFinder
|
|
{
|
|
Mf_Init_Func Init;
|
|
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_2(CMatchFinder *p, int readData);
|
|
void MatchFinder_Init(CMatchFinder *p);
|
|
|
|
UInt32 Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
|
|
UInt32 Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
|
|
|
|
void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
|
|
void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
|
|
|
|
EXTERN_C_END
|
|
|
|
#endif
|