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