152 lines
3.3 KiB
C
152 lines
3.3 KiB
C
/* Ppmd.h -- PPMD codec common code
|
|
2010-03-12 : Igor Pavlov : Public domain
|
|
This code is based on PPMd var.H (2001): Dmitry Shkarin : Public domain */
|
|
|
|
#ifndef ARCHIVE_PPMD_PRIVATE_H_INCLUDED
|
|
#define ARCHIVE_PPMD_PRIVATE_H_INCLUDED
|
|
|
|
#ifndef __LIBARCHIVE_BUILD
|
|
#error This header is only to be used internally to libarchive.
|
|
#endif
|
|
|
|
#include <stddef.h>
|
|
|
|
#include "archive_read_private.h"
|
|
|
|
/*** Begin defined in Types.h ***/
|
|
|
|
#if !defined(ZCONF_H)
|
|
typedef unsigned char Byte;
|
|
#endif
|
|
typedef short Int16;
|
|
typedef unsigned short UInt16;
|
|
|
|
#ifdef _LZMA_UINT32_IS_ULONG
|
|
typedef long Int32;
|
|
typedef unsigned long UInt32;
|
|
#else
|
|
typedef int Int32;
|
|
typedef unsigned int UInt32;
|
|
#endif
|
|
|
|
#ifdef _SZ_NO_INT_64
|
|
|
|
/* define _SZ_NO_INT_64, if your compiler doesn't support 64-bit integers.
|
|
NOTES: Some code will work incorrectly in that case! */
|
|
|
|
typedef long Int64;
|
|
typedef unsigned long UInt64;
|
|
|
|
#else
|
|
|
|
#if defined(_MSC_VER) || defined(__BORLANDC__)
|
|
typedef __int64 Int64;
|
|
typedef unsigned __int64 UInt64;
|
|
#define UINT64_CONST(n) n
|
|
#else
|
|
typedef long long int Int64;
|
|
typedef unsigned long long int UInt64;
|
|
#define UINT64_CONST(n) n ## ULL
|
|
#endif
|
|
|
|
#endif
|
|
|
|
typedef int Bool;
|
|
#define True 1
|
|
#define False 0
|
|
|
|
/* The following interfaces use first parameter as pointer to structure */
|
|
|
|
typedef struct
|
|
{
|
|
struct archive_read *a;
|
|
Byte (*Read)(void *p); /* reads one byte, returns 0 in case of EOF or error */
|
|
} IByteIn;
|
|
|
|
typedef struct
|
|
{
|
|
struct archive_write *a;
|
|
void (*Write)(void *p, Byte b);
|
|
} IByteOut;
|
|
|
|
/*** End defined in Types.h ***/
|
|
/*** Begin defined in CpuArch.h ***/
|
|
|
|
#if defined(_M_IX86) || defined(__i386__)
|
|
#define MY_CPU_X86
|
|
#endif
|
|
|
|
#if defined(MY_CPU_X86) || defined(_M_ARM)
|
|
#define MY_CPU_32BIT
|
|
#endif
|
|
|
|
#ifdef MY_CPU_32BIT
|
|
#define PPMD_32BIT
|
|
#endif
|
|
|
|
/*** End defined in CpuArch.h ***/
|
|
|
|
#define PPMD_INT_BITS 7
|
|
#define PPMD_PERIOD_BITS 7
|
|
#define PPMD_BIN_SCALE (1 << (PPMD_INT_BITS + PPMD_PERIOD_BITS))
|
|
|
|
#define PPMD_GET_MEAN_SPEC(summ, shift, round) (((summ) + (1 << ((shift) - (round)))) >> (shift))
|
|
#define PPMD_GET_MEAN(summ) PPMD_GET_MEAN_SPEC((summ), PPMD_PERIOD_BITS, 2)
|
|
#define PPMD_UPDATE_PROB_0(prob) ((prob) + (1 << PPMD_INT_BITS) - PPMD_GET_MEAN(prob))
|
|
#define PPMD_UPDATE_PROB_1(prob) ((prob) - PPMD_GET_MEAN(prob))
|
|
|
|
#define PPMD_N1 4
|
|
#define PPMD_N2 4
|
|
#define PPMD_N3 4
|
|
#define PPMD_N4 ((128 + 3 - 1 * PPMD_N1 - 2 * PPMD_N2 - 3 * PPMD_N3) / 4)
|
|
#define PPMD_NUM_INDEXES (PPMD_N1 + PPMD_N2 + PPMD_N3 + PPMD_N4)
|
|
|
|
/* SEE-contexts for PPM-contexts with masked symbols */
|
|
typedef struct
|
|
{
|
|
UInt16 Summ; /* Freq */
|
|
Byte Shift; /* Speed of Freq change; low Shift is for fast change */
|
|
Byte Count; /* Count to next change of Shift */
|
|
} CPpmd_See;
|
|
|
|
#define Ppmd_See_Update(p) if ((p)->Shift < PPMD_PERIOD_BITS && --(p)->Count == 0) \
|
|
{ (p)->Summ <<= 1; (p)->Count = (Byte)(3 << (p)->Shift++); }
|
|
|
|
typedef struct
|
|
{
|
|
Byte Symbol;
|
|
Byte Freq;
|
|
UInt16 SuccessorLow;
|
|
UInt16 SuccessorHigh;
|
|
} CPpmd_State;
|
|
|
|
typedef
|
|
#ifdef PPMD_32BIT
|
|
CPpmd_State *
|
|
#else
|
|
UInt32
|
|
#endif
|
|
CPpmd_State_Ref;
|
|
|
|
typedef
|
|
#ifdef PPMD_32BIT
|
|
void *
|
|
#else
|
|
UInt32
|
|
#endif
|
|
CPpmd_Void_Ref;
|
|
|
|
typedef
|
|
#ifdef PPMD_32BIT
|
|
Byte *
|
|
#else
|
|
UInt32
|
|
#endif
|
|
CPpmd_Byte_Ref;
|
|
|
|
#define PPMD_SetAllBitsIn256Bytes(p) \
|
|
{ unsigned j; for (j = 0; j < 256 / sizeof(p[0]); j += 8) { \
|
|
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; }}
|
|
|
|
#endif
|