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/* LzFind.h -- Match finder for LZ algorithms
2017-06-10 : 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;
UInt64 expectedDataSize;
} 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,
ISzAllocPtr alloc
);
void
MatchFinder_Free (
CMatchFinder *p,
ISzAllocPtr 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_LowHash (
CMatchFinder *p
);
void
MatchFinder_Init_HighHash (
CMatchFinder *p
);
void
MatchFinder_Init_3 (
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
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