/* LzFind.h -- Match finder for LZ algorithms
2009-04-22 : Igor Pavlov : Public domain */

#ifndef __LZ_FIND_H
#define __LZ_FIND_H

#include "Types.h"

#ifdef __cplusplus
extern "C" {
#endif

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;
	size_t directInputRem;
	int btMode;
	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)

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);

/*
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);

#ifdef __cplusplus
}
#endif

#endif