120 lines
3.0 KiB
C
120 lines
3.0 KiB
C
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/* Ppmd7.h -- PPMdH compression codec
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2010-03-12 : Igor Pavlov : Public domain
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This code is based on PPMd var.H (2001): Dmitry Shkarin : Public domain */
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/* This code supports virtual RangeDecoder and includes the implementation
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of RangeCoder from 7z, instead of RangeCoder from original PPMd var.H.
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If you need the compatibility with original PPMd var.H, you can use external RangeDecoder */
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#ifndef __LIBARCHIVE_BUILD
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#error This header is only to be used internally to libarchive.
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#endif
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#ifndef ARCHIVE_PPMD7_PRIVATE_H_INCLUDED
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#define ARCHIVE_PPMD7_PRIVATE_H_INCLUDED
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#include "archive_ppmd_private.h"
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#define PPMD7_MIN_ORDER 2
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#define PPMD7_MAX_ORDER 64
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#define PPMD7_MIN_MEM_SIZE (1 << 11)
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#define PPMD7_MAX_MEM_SIZE (0xFFFFFFFF - 12 * 3)
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struct CPpmd7_Context_;
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typedef
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#ifdef PPMD_32BIT
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struct CPpmd7_Context_ *
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#else
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UInt32
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#endif
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CPpmd7_Context_Ref;
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typedef struct CPpmd7_Context_
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{
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UInt16 NumStats;
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UInt16 SummFreq;
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CPpmd_State_Ref Stats;
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CPpmd7_Context_Ref Suffix;
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} CPpmd7_Context;
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#define Ppmd7Context_OneState(p) ((CPpmd_State *)&(p)->SummFreq)
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typedef struct
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{
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CPpmd7_Context *MinContext, *MaxContext;
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CPpmd_State *FoundState;
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unsigned OrderFall, InitEsc, PrevSuccess, MaxOrder, HiBitsFlag;
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Int32 RunLength, InitRL; /* must be 32-bit at least */
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UInt32 Size;
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UInt32 GlueCount;
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Byte *Base, *LoUnit, *HiUnit, *Text, *UnitsStart;
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UInt32 AlignOffset;
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Byte Indx2Units[PPMD_NUM_INDEXES];
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Byte Units2Indx[128];
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CPpmd_Void_Ref FreeList[PPMD_NUM_INDEXES];
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Byte NS2Indx[256], NS2BSIndx[256], HB2Flag[256];
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CPpmd_See DummySee, See[25][16];
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UInt16 BinSumm[128][64];
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} CPpmd7;
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/* ---------- Decode ---------- */
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typedef struct
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{
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UInt32 (*GetThreshold)(void *p, UInt32 total);
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void (*Decode)(void *p, UInt32 start, UInt32 size);
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UInt32 (*DecodeBit)(void *p, UInt32 size0);
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} IPpmd7_RangeDec;
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typedef struct
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{
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IPpmd7_RangeDec p;
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UInt32 Range;
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UInt32 Code;
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UInt32 Low;
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UInt32 Bottom;
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IByteIn *Stream;
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} CPpmd7z_RangeDec;
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/* ---------- Encode ---------- */
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typedef struct
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{
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UInt64 Low;
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UInt32 Range;
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Byte Cache;
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UInt64 CacheSize;
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IByteOut *Stream;
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} CPpmd7z_RangeEnc;
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typedef struct
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{
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/* Base Functions */
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void (*Ppmd7_Construct)(CPpmd7 *p);
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Bool (*Ppmd7_Alloc)(CPpmd7 *p, UInt32 size, ISzAlloc *alloc);
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void (*Ppmd7_Free)(CPpmd7 *p, ISzAlloc *alloc);
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void (*Ppmd7_Init)(CPpmd7 *p, unsigned maxOrder);
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#define Ppmd7_WasAllocated(p) ((p)->Base != NULL)
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/* Decode Functions */
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void (*Ppmd7z_RangeDec_CreateVTable)(CPpmd7z_RangeDec *p);
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void (*PpmdRAR_RangeDec_CreateVTable)(CPpmd7z_RangeDec *p);
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Bool (*Ppmd7z_RangeDec_Init)(CPpmd7z_RangeDec *p);
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Bool (*PpmdRAR_RangeDec_Init)(CPpmd7z_RangeDec *p);
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#define Ppmd7z_RangeDec_IsFinishedOK(p) ((p)->Code == 0)
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int (*Ppmd7_DecodeSymbol)(CPpmd7 *p, IPpmd7_RangeDec *rc);
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/* Encode Functions */
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void (*Ppmd7z_RangeEnc_Init)(CPpmd7z_RangeEnc *p);
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void (*Ppmd7z_RangeEnc_FlushData)(CPpmd7z_RangeEnc *p);
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void (*Ppmd7_EncodeSymbol)(CPpmd7 *p, CPpmd7z_RangeEnc *rc, int symbol);
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} IPpmd7;
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extern const IPpmd7 __archive_ppmd7_functions;
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#endif
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