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152 lines
3.3 KiB
152 lines
3.3 KiB
/* Ppmd.h -- PPMD codec common code
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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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#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_PPMD_PRIVATE_H_INCLUDED
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#define ARCHIVE_PPMD_PRIVATE_H_INCLUDED
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#include <stddef.h>
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#include "archive_read_private.h"
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/*** Begin defined in Types.h ***/
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#if !defined(ZCONF_H)
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typedef unsigned char Byte;
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#endif
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typedef short Int16;
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typedef unsigned short UInt16;
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#ifdef _LZMA_UINT32_IS_ULONG
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typedef long Int32;
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typedef unsigned long UInt32;
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#else
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typedef int Int32;
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typedef unsigned int UInt32;
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#endif
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#ifdef _SZ_NO_INT_64
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/* define _SZ_NO_INT_64, if your compiler doesn't support 64-bit integers.
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NOTES: Some code will work incorrectly in that case! */
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typedef long Int64;
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typedef unsigned long UInt64;
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#else
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#if defined(_MSC_VER) || defined(__BORLANDC__)
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typedef __int64 Int64;
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typedef unsigned __int64 UInt64;
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#define UINT64_CONST(n) n
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#else
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typedef long long int Int64;
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typedef unsigned long long int UInt64;
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#define UINT64_CONST(n) n ## ULL
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#endif
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#endif
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typedef int Bool;
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#define True 1
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#define False 0
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/* The following interfaces use first parameter as pointer to structure */
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typedef struct
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{
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struct archive_read *a;
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Byte (*Read)(void *p); /* reads one byte, returns 0 in case of EOF or error */
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} IByteIn;
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typedef struct
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{
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struct archive_write *a;
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void (*Write)(void *p, Byte b);
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} IByteOut;
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/*** End defined in Types.h ***/
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/*** Begin defined in CpuArch.h ***/
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#if defined(_M_IX86) || defined(__i386__)
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#define MY_CPU_X86
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#endif
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#if defined(MY_CPU_X86) || defined(_M_ARM)
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#define MY_CPU_32BIT
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#endif
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#ifdef MY_CPU_32BIT
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#define PPMD_32BIT
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#endif
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/*** End defined in CpuArch.h ***/
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#define PPMD_INT_BITS 7
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#define PPMD_PERIOD_BITS 7
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#define PPMD_BIN_SCALE (1 << (PPMD_INT_BITS + PPMD_PERIOD_BITS))
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#define PPMD_GET_MEAN_SPEC(summ, shift, round) (((summ) + (1 << ((shift) - (round)))) >> (shift))
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#define PPMD_GET_MEAN(summ) PPMD_GET_MEAN_SPEC((summ), PPMD_PERIOD_BITS, 2)
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#define PPMD_UPDATE_PROB_0(prob) ((prob) + (1 << PPMD_INT_BITS) - PPMD_GET_MEAN(prob))
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#define PPMD_UPDATE_PROB_1(prob) ((prob) - PPMD_GET_MEAN(prob))
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#define PPMD_N1 4
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#define PPMD_N2 4
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#define PPMD_N3 4
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#define PPMD_N4 ((128 + 3 - 1 * PPMD_N1 - 2 * PPMD_N2 - 3 * PPMD_N3) / 4)
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#define PPMD_NUM_INDEXES (PPMD_N1 + PPMD_N2 + PPMD_N3 + PPMD_N4)
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/* SEE-contexts for PPM-contexts with masked symbols */
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typedef struct
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{
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UInt16 Summ; /* Freq */
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Byte Shift; /* Speed of Freq change; low Shift is for fast change */
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Byte Count; /* Count to next change of Shift */
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} CPpmd_See;
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#define Ppmd_See_Update(p) if ((p)->Shift < PPMD_PERIOD_BITS && --(p)->Count == 0) \
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{ (p)->Summ <<= 1; (p)->Count = (Byte)(3 << (p)->Shift++); }
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typedef struct
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{
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Byte Symbol;
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Byte Freq;
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UInt16 SuccessorLow;
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UInt16 SuccessorHigh;
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} CPpmd_State;
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typedef
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#ifdef PPMD_32BIT
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CPpmd_State *
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#else
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UInt32
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#endif
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CPpmd_State_Ref;
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typedef
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#ifdef PPMD_32BIT
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void *
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#else
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UInt32
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#endif
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CPpmd_Void_Ref;
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typedef
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#ifdef PPMD_32BIT
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Byte *
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#else
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UInt32
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#endif
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CPpmd_Byte_Ref;
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#define PPMD_SetAllBitsIn256Bytes(p) \
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{ unsigned j; for (j = 0; j < 256 / sizeof(p[0]); j += 8) { \
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p[j+7] = p[j+6] = p[j+5] = p[j+4] = p[j+3] = p[j+2] = p[j+1] = p[j+0] = ~(size_t)0; }}
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#endif
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