grub-lakitu/include/grub/lib/LzFind.h

/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (c) 1999-2008 Igor Pavlov
 *  Copyright (C) 2008  Free Software Foundation, Inc.
 *
 *  GRUB is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  GRUB is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * This code was taken from LZMA SDK 4.58 beta, and was slightly modified
 * to adapt it to GRUB's requirement.
 *
 * See <http://www.7-zip.org>, for more information about LZMA.
 */

#ifndef __LZFIND_H
#define __LZFIND_H

#include <grub/lib/LzmaTypes.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