ppmdtype.h

PPMd压缩方式的源码

/****************************************************************************
 *  This file is part of PPMd project                                       *
 *  Written and distributed to public domain by Dmitry Shkarin 1997,        *
 *  1999-2001                                                               *
 *  Contents: compilation parameters and miscelaneous definitions           *
 *  Comments: system & compiler dependent file                              *
 ****************************************************************************/
#if !defined(_PPMDTYPE_H_)
#define _PPMDTYPE_H_

#include <stdio.h>

#define _WIN32_ENVIRONMENT_
//#define _DOS32_ENVIRONMENT_
//#define _POSIX_ENVIRONMENT_
//#define _UNKNOWN_ENVIRONMENT_
#if defined(_WIN32_ENVIRONMENT_)+defined(_DOS32_ENVIRONMENT_)+defined(_POSIX_ENVIRONMENT_)+defined(_UNKNOWN_ENVIRONMENT_) != 1
#error Only one environment must be defined
#endif /* defined(_WIN32_ENVIRONMENT_)+defined(_DOS32_ENVIRONMENT_)+defined(_POSIX_ENVIRONMENT_)+defined(_UNKNOWN_ENVIRONMENT_) != 1 */

#if defined(_WIN32_ENVIRONMENT_)
#include <windows.h>
#else /* _DOS32_ENVIRONMENT_ || _POSIX_ENVIRONMENT_ || _UNKNOWN_ENVIRONMENT_ */
typedef int   BOOL;
#define FALSE 0
#define TRUE  1
typedef unsigned char  BYTE;
typedef unsigned short WORD;
typedef unsigned long  DWORD;
typedef unsigned int   UINT;
#endif /* defined(_WIN32_ENVIRONMENT_)  */

const DWORD PPMdSignature=0x84ACAF8F, Variant='I';
const int MAX_O=16;                         /* maximum allowed model order  */

#define _USE_PREFETCHING                    /* for puzzling mainly          */

#if !defined(_UNKNOWN_ENVIRONMENT_) && !defined(__GNUC__)
#define _FASTCALL __fastcall
#define _STDCALL  __stdcall
#else
#define _FASTCALL
#define _STDCALL
#endif /* !defined(_UNKNOWN_ENVIRONMENT_) && !defined(__GNUC__) */

#if defined(__GNUC__)
#define _PACK_ATTR __attribute__ ((packed))
#else /* "#pragma pack" is used for other compilers */
#define _PACK_ATTR
#endif /* defined(__GNUC__) */

/* PPMd module works with file streams via ...GETC/...PUTC macros only      */
typedef FILE _PPMD_FILE;
#define _PPMD_E_GETC(fp)   getc(fp)
#define _PPMD_E_PUTC(c,fp) putc((c),fp)
#define _PPMD_D_GETC(fp)   getc(fp)
#define _PPMD_D_PUTC(c,fp) putc((c),fp)
/******************  Example of C++ buffered stream  ************************
class PRIME_STREAM {
public:
enum { BUF_SIZE=64*1024 };
    PRIME_STREAM(): Error(0), StrPos(0), Count(0), p(Buf) {}
    int  get(     ) { return (--Count >= 0)?(*p++    ):( fill( )); }
    int  put(int c) { return (--Count >= 0)?(*p++ = c):(flush(c)); }
    int  getErr() const { return Error; }
    int    tell() const { return StrPos+(p-Buf); }
    BOOL  atEOS() const { return (Count < 0); }
protected:
    int Error, StrPos, Count;
    BYTE* p, Buf[BUF_SIZE];
    virtual int  fill(     ) = 0;           // it must fill Buf[]
    virtual int flush(int c) = 0;           // it must remove (p-Buf) bytes
};
typedef PRIME_STREAM _PPMD_FILE;
#define _PPMD_E_GETC(pps)   (pps)->get()
#define _PPMD_E_PUTC(c,pps) (pps)->put(c)
#define _PPMD_D_GETC(pps)   (pps)->get()
#define _PPMD_D_PUTC(c,pps) (pps)->put(c)
**************************  End of example  *********************************/

#endif /* !defined(_PPMDTYPE_H_) */