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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 CLzRef;

typedef struct _CMatchFinder
{
Byte *buffer;
UInt32 pos;
UInt32 posLimit;
UInt32 streamPos;
UInt32 lenLimit;

UInt32 cyclicBufferPos;
UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */

UInt32 matchMaxLen;
CLzRef *hash;
CLzRef *son;
UInt32 hashMask;
UInt32 cutValue;

Byte *bufferBase;
ISeqInStream *stream;
int streamEndWasReached;

UInt32 blockSize;
UInt32 keepSizeBefore;
UInt32 keepSizeAfter;

UInt32 numHashBytes;
int directInput;
int btMode;
/* int skipModeBits; */
int bigHash;
UInt32 historySize;
UInt32 fixedHashSize;
UInt32 hashSizeSum;
UInt32 numSons;
SRes result;
UInt32 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);
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, UInt32 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 Byte (*Mf_GetIndexByte_Func)(void *object, Int32 index);
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_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 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);

#endif
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