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182 lines
4.5 KiB
182 lines
4.5 KiB
/* Ppmd7.h -- Ppmd7 (PPMdH) compression codec
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2021-04-13 : Igor Pavlov : Public domain
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This code is based on:
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PPMd var.H (2001): Dmitry Shkarin : Public domain */
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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 Ppmd_Ref_Type(struct CPpmd7_Context_) CPpmd7_Context_Ref;
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// MY_CPU_pragma_pack_push_1
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typedef struct CPpmd7_Context_
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{
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UInt16 NumStats;
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union
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{
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UInt16 SummFreq;
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CPpmd_State2 State2;
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} Union2;
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union
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{
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CPpmd_State_Ref Stats;
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CPpmd_State4 State4;
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} Union4;
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CPpmd7_Context_Ref Suffix;
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} CPpmd7_Context;
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// MY_CPU_pragma_pop
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#define Ppmd7Context_OneState(p) ((CPpmd_State *)&(p)->Union2)
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typedef struct
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{
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UInt32 Range;
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UInt32 Code;
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UInt32 Low;
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IByteIn *Stream;
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} CPpmd7_RangeDec;
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typedef struct
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{
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UInt32 Range;
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Byte Cache;
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// Byte _dummy_[3];
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UInt64 Low;
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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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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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UInt32 AlignOffset;
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Byte *Base, *LoUnit, *HiUnit, *Text, *UnitsStart;
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union
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{
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CPpmd7_RangeDec dec;
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CPpmd7z_RangeEnc enc;
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} rc;
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Byte Indx2Units[PPMD_NUM_INDEXES + 2]; // +2 for alignment
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Byte Units2Indx[128];
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CPpmd_Void_Ref FreeList[PPMD_NUM_INDEXES];
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Byte NS2BSIndx[256], NS2Indx[256];
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Byte ExpEscape[16];
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CPpmd_See DummySee, See[25][16];
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UInt16 BinSumm[128][64];
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// int LastSymbol;
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} CPpmd7;
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void Ppmd7_Construct(CPpmd7 *p);
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BoolInt 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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#define Ppmd7_GetPtr(p, ptr) Ppmd_GetPtr(p, ptr)
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#define Ppmd7_GetContext(p, ptr) Ppmd_GetPtr_Type(p, ptr, CPpmd7_Context)
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#define Ppmd7_GetStats(p, ctx) Ppmd_GetPtr_Type(p, (ctx)->Union4.Stats, CPpmd_State)
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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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#define PPMD7_HiBitsFlag_3(sym) ((((unsigned)sym + 0xC0) >> (8 - 3)) & (1 << 3))
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#define PPMD7_HiBitsFlag_4(sym) ((((unsigned)sym + 0xC0) >> (8 - 4)) & (1 << 4))
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// #define PPMD7_HiBitsFlag_3(sym) ((sym) < 0x40 ? 0 : (1 << 3))
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// #define PPMD7_HiBitsFlag_4(sym) ((sym) < 0x40 ? 0 : (1 << 4))
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#define Ppmd7_GetBinSumm(p) \
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&p->BinSumm[(size_t)(unsigned)Ppmd7Context_OneState(p->MinContext)->Freq - 1] \
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[ p->PrevSuccess + ((p->RunLength >> 26) & 0x20) \
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+ p->NS2BSIndx[(size_t)Ppmd7_GetContext(p, p->MinContext->Suffix)->NumStats - 1] \
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+ PPMD7_HiBitsFlag_4(Ppmd7Context_OneState(p->MinContext)->Symbol) \
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+ (p->HiBitsFlag = PPMD7_HiBitsFlag_3(p->FoundState->Symbol)) ]
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CPpmd_See *Ppmd7_MakeEscFreq(CPpmd7 *p, unsigned numMasked, UInt32 *scale);
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/*
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We support two versions of Ppmd7 (PPMdH) methods that use same CPpmd7 structure:
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1) Ppmd7a_*: original PPMdH
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2) Ppmd7z_*: modified PPMdH with 7z Range Coder
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Ppmd7_*: the structures and functions that are common for both versions of PPMd7 (PPMdH)
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*/
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/* ---------- Decode ---------- */
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#define PPMD7_SYM_END (-1)
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#define PPMD7_SYM_ERROR (-2)
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/*
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You must set (CPpmd7::rc.dec.Stream) before Ppmd7*_RangeDec_Init()
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Ppmd7*_DecodeSymbol()
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out:
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>= 0 : decoded byte
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-1 : PPMD7_SYM_END : End of payload marker
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-2 : PPMD7_SYM_ERROR : Data error
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*/
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/* Ppmd7a_* : original PPMdH */
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BoolInt Ppmd7a_RangeDec_Init(CPpmd7_RangeDec *p);
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#define Ppmd7a_RangeDec_IsFinishedOK(p) ((p)->Code == 0)
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int Ppmd7a_DecodeSymbol(CPpmd7 *p);
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/* Ppmd7z_* : modified PPMdH with 7z Range Coder */
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BoolInt Ppmd7z_RangeDec_Init(CPpmd7_RangeDec *p);
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#define Ppmd7z_RangeDec_IsFinishedOK(p) ((p)->Code == 0)
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int Ppmd7z_DecodeSymbol(CPpmd7 *p);
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// Byte *Ppmd7z_DecodeSymbols(CPpmd7 *p, Byte *buf, const Byte *lim);
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/* ---------- Encode ---------- */
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void Ppmd7z_Init_RangeEnc(CPpmd7 *p);
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void Ppmd7z_Flush_RangeEnc(CPpmd7 *p);
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// void Ppmd7z_EncodeSymbol(CPpmd7 *p, int symbol);
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void Ppmd7z_EncodeSymbols(CPpmd7 *p, const Byte *buf, const Byte *lim);
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EXTERN_C_END
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#endif
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