135 lines
3.7 KiB
C
Executable file
135 lines
3.7 KiB
C
Executable file
/* Ppmd8.h -- PPMdI codec
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2010-03-24 : Igor Pavlov : Public domain
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This code is based on:
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PPMd var.I (2002): Dmitry Shkarin : Public domain
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Carryless rangecoder (1999): Dmitry Subbotin : Public domain */
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#ifndef __PPMD8_H
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#define __PPMD8_H
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#include "Ppmd.h"
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EXTERN_C_BEGIN
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#define PPMD8_MIN_ORDER 2
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#define PPMD8_MAX_ORDER 16
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struct CPpmd8_Context_;
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typedef
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#ifdef PPMD_32BIT
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struct CPpmd8_Context_ *
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#else
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UInt32
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#endif
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CPpmd8_Context_Ref;
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typedef struct CPpmd8_Context_
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{
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Byte NumStats;
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Byte Flags;
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UInt16 SummFreq;
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CPpmd_State_Ref Stats;
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CPpmd8_Context_Ref Suffix;
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} CPpmd8_Context;
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#define Ppmd8Context_OneState(p) ((CPpmd_State *)&(p)->SummFreq)
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/* The BUG in Shkarin's code for FREEZE mode was fixed, but that fixed
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code is not compatible with original code for some files compressed
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in FREEZE mode. So we disable FREEZE mode support. */
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enum
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{
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PPMD8_RESTORE_METHOD_RESTART,
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PPMD8_RESTORE_METHOD_CUT_OFF
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#ifdef PPMD8_FREEZE_SUPPORT
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, PPMD8_RESTORE_METHOD_FREEZE
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#endif
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};
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typedef struct
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{
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CPpmd8_Context *MinContext, *MaxContext;
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CPpmd_State *FoundState;
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unsigned OrderFall, InitEsc, PrevSuccess, MaxOrder;
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Int32 RunLength, InitRL; /* must be 32-bit at least */
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/* Model order to be used by calling program. */
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Int32 Order;
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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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unsigned RestoreMethod;
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/* Range Coder */
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UInt32 Range;
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UInt32 Code;
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UInt32 Low;
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Byte *buf;
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UInt32 bufUsed, bufLen, overflow;
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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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UInt32 Stamps[PPMD_NUM_INDEXES];
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Byte NS2BSIndx[256], NS2Indx[260];
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CPpmd_See DummySee, See[24][32];
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UInt16 BinSumm[25][64];
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} CPpmd8;
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void Ppmd8_Construct(CPpmd8 *p);
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Bool Ppmd8_Alloc(CPpmd8 *p, UInt32 size, ISzAlloc *alloc);
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void Ppmd8_Free(CPpmd8 *p, ISzAlloc *alloc);
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void Ppmd8_Init(CPpmd8 *p, unsigned maxOrder, unsigned restoreMethod);
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#define Ppmd8_WasAllocated(p) ((p)->Base != NULL)
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/* ---------- Internal Functions ---------- */
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extern const Byte PPMD8_kExpEscape[16];
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#ifdef PPMD_32BIT
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#define Ppmd8_GetPtr(p, ptr) (ptr)
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#define Ppmd8_GetContext(p, ptr) (ptr)
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#define Ppmd8_GetStats(p, ctx) ((ctx)->Stats)
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#else
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#define Ppmd8_GetPtr(p, offs) ((void *)((p)->Base + (offs)))
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#define Ppmd8_GetContext(p, offs) ((CPpmd8_Context *)Ppmd8_GetPtr((p), (offs)))
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#define Ppmd8_GetStats(p, ctx) ((CPpmd_State *)Ppmd8_GetPtr((p), ((ctx)->Stats)))
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#endif
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void Ppmd8_Update1(CPpmd8 *p);
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void Ppmd8_Update1_0(CPpmd8 *p);
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void Ppmd8_Update2(CPpmd8 *p);
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void Ppmd8_UpdateBin(CPpmd8 *p);
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#define Ppmd8_GetBinSumm(p) \
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&p->BinSumm[p->NS2Indx[Ppmd8Context_OneState(p->MinContext)->Freq - 1]][ \
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p->NS2BSIndx[Ppmd8_GetContext(p, p->MinContext->Suffix)->NumStats] + \
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p->PrevSuccess + p->MinContext->Flags + ((p->RunLength >> 26) & 0x20)]
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CPpmd_See *Ppmd8_MakeEscFreq(CPpmd8 *p, unsigned numMasked, UInt32 *scale);
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/* ---------- Decode ---------- */
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Bool Ppmd8_RangeDec_Init(CPpmd8 *p);
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#define Ppmd8_RangeDec_IsFinishedOK(p) ((p)->Code == 0)
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int Ppmd8_DecodeSymbol(CPpmd8 *p); /* returns: -1 as EndMarker, -2 as DataError */
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int Ppmd8_DecodeToBuffer(CPpmd8 *p, Byte *buf, size_t buflen, size_t *decodedlen);
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/* ---------- Encode ---------- */
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#define Ppmd8_RangeEnc_Init(p) { (p)->Low = 0; (p)->Range = 0xFFFFFFFF; }
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void Ppmd8_RangeEnc_FlushData(CPpmd8 *p);
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void Ppmd8_EncodeSymbol(CPpmd8 *p, int symbol); /* symbol = -1 means EndMarker */
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void Ppmd8_EncodeBuffer(CPpmd8 *p, Byte *buf, size_t buflen);
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EXTERN_C_END
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#endif
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