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143 lines
3.9 KiB
C
143 lines
3.9 KiB
C
/* Ppmd7.h -- PPMdH compression codec
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2017-04-03 : 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 __PPMD7_H
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#define __PPMD7_H
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#include "Ppmd.h"
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EXTERN_C_BEGIN
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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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void Ppmd7_Construct(CPpmd7 *p);
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Bool Ppmd7_Alloc(CPpmd7 *p, UInt32 size, ISzAllocPtr alloc);
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void Ppmd7_Free(CPpmd7 *p, ISzAllocPtr 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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/* ---------- Internal Functions ---------- */
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extern const Byte PPMD7_kExpEscape[16];
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#ifdef PPMD_32BIT
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#define Ppmd7_GetPtr(p, ptr) (ptr)
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#define Ppmd7_GetContext(p, ptr) (ptr)
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#define Ppmd7_GetStats(p, ctx) ((ctx)->Stats)
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#else
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#define Ppmd7_GetPtr(p, offs) ((void *)((p)->Base + (offs)))
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#define Ppmd7_GetContext(p, offs) ((CPpmd7_Context *)Ppmd7_GetPtr((p), (offs)))
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#define Ppmd7_GetStats(p, ctx) ((CPpmd_State *)Ppmd7_GetPtr((p), ((ctx)->Stats)))
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#endif
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void Ppmd7_Update1(CPpmd7 *p);
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void Ppmd7_Update1_0(CPpmd7 *p);
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void Ppmd7_Update2(CPpmd7 *p);
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void Ppmd7_UpdateBin(CPpmd7 *p);
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#define Ppmd7_GetBinSumm(p) \
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&p->BinSumm[(size_t)(unsigned)Ppmd7Context_OneState(p->MinContext)->Freq - 1][p->PrevSuccess + \
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p->NS2BSIndx[(size_t)Ppmd7_GetContext(p, p->MinContext->Suffix)->NumStats - 1] + \
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(p->HiBitsFlag = p->HB2Flag[p->FoundState->Symbol]) + \
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2 * p->HB2Flag[(unsigned)Ppmd7Context_OneState(p->MinContext)->Symbol] + \
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((p->RunLength >> 26) & 0x20)]
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CPpmd_See *Ppmd7_MakeEscFreq(CPpmd7 *p, unsigned numMasked, UInt32 *scale);
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/* ---------- Decode ---------- */
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typedef struct IPpmd7_RangeDec IPpmd7_RangeDec;
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struct IPpmd7_RangeDec
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{
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UInt32 (*GetThreshold)(const IPpmd7_RangeDec *p, UInt32 total);
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void (*Decode)(const IPpmd7_RangeDec *p, UInt32 start, UInt32 size);
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UInt32 (*DecodeBit)(const IPpmd7_RangeDec *p, UInt32 size0);
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};
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typedef struct
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{
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IPpmd7_RangeDec vt;
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UInt32 Range;
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UInt32 Code;
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IByteIn *Stream;
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} CPpmd7z_RangeDec;
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void Ppmd7z_RangeDec_CreateVTable(CPpmd7z_RangeDec *p);
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Bool Ppmd7z_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, const IPpmd7_RangeDec *rc);
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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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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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EXTERN_C_END
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#endif
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