zutil.h

一个基于Zlib算法的

/* zutil.h -- internal interface and configuration of the compression library
 * Copyright (C) 1995-2003 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

/* WARNING: this file should *not* be used by applications. It is
   part of the implementation of the compression library and is
   subject to change. Applications should only use zlib.h.
 */

/* @(#) $Id$ */

#ifndef ZUTIL_H
#define ZUTIL_H

#define ZLIB_INTERNAL
/*#include "zlib.h"*/
#include <sdk/exlib/compress/zlib.h>

#ifdef STDC
    #include <stddef.h>
    #include <string.h>
    #include <stdlib.h>
#endif

#ifdef NO_ERRNO_H
    extern int errno;
#else
    #include <errno.h>
#endif

#ifndef local
    #define local static
#endif
/* compile with -Dlocal if your debugger can't find static symbols */

typedef unsigned char  uch;
typedef uch FAR uchf;
typedef unsigned short ush;
typedef ush FAR ushf;
typedef unsigned long  ulg;

extern const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
/* (size given to avoid silly warnings with Visual C++) */

#define ERR_MSG(err) z_errmsg[Z_NEED_DICT-(err)]

#define ERR_RETURN(strm,err)  return (strm->msg = (char*)ERR_MSG(err), (err))
/* To be used only when the state is known to be valid */

        /* common constants */

#ifndef DEF_WBITS
    #define DEF_WBITS MAX_WBITS
#endif
/* default windowBits for decompression. MAX_WBITS is for compression only */

#if MAX_MEM_LEVEL >= 8
    #define DEF_MEM_LEVEL 8
#else
    #define DEF_MEM_LEVEL  MAX_MEM_LEVEL
#endif
/* default memLevel */

#define STORED_BLOCK 0
#define STATIC_TREES 1
#define DYN_TREES    2
/* The three kinds of block type */

#define MIN_MATCH  3
#define MAX_MATCH  258
/* The minimum and maximum match lengths */

#define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */

        /* target dependencies */

#if defined(MSDOS) || (defined(WINDOWS) && !defined(WIN32))
    #define OS_CODE  0x00
    #if defined(__TURBOC__) || defined(__BORLANDC__)
        #if(__STDC__ == 1) && (defined(__LARGE__) || defined(__COMPACT__))
            /* Allow compilation with ANSI keywords only enabled */
            void _Cdecl farfree( void *block );
            void *_Cdecl farmalloc( unsigned long nbytes );
        #else
            #include <alloc.h>
        #endif
    #else /* MSC or DJGPP */
        #include <malloc.h>
    #endif
#endif

#ifdef AMIGA
    #define OS_CODE  0x01
#endif

#if defined(VAXC) || defined(VMS)
    #define OS_CODE  0x02
    #define F_OPEN(name, mode)  fopen((name), (mode), "mbc=60", "ctx=stm", "rfm=fix", "mrs=512")
#endif

#if defined(ATARI) || defined(atarist)
    #define OS_CODE  0x05
#endif

#ifdef OS2
    #define OS_CODE  0x06
#endif

#if defined(MACOS) || defined(TARGET_OS_MAC)
    #define OS_CODE  0x07
    #if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
        #include <unix.h> /* for fdopen */
    #else
        #ifndef fdopen
            #define fdopen(fd,mode) NULL /* No fdopen() */
        #endif
    #endif
#endif

#ifdef TOPS20
    #define OS_CODE  0x0a
#endif

#ifdef WIN32
    #ifndef __CYGWIN__  /* Cygwin is Unix, not Win32 */
        #define OS_CODE  0x0b
    #endif
#endif

#ifdef __50SERIES /* Prime/PRIMOS */
    #define OS_CODE  0x0f
#endif

#if defined(_BEOS_) || defined(RISCOS)
    #define fdopen(fd,mode) NULL /* No fdopen() */
#endif

#if (defined(_MSC_VER) && (_MSC_VER > 600))
    #if defined(_WIN32_WCE)
        #define fdopen(fd,mode) NULL /* No fdopen() */
        #ifndef _PTRDIFF_T_DEFINED
            typedef int ptrdiff_t;
            #define _PTRDIFF_T_DEFINED
        #endif
    #else
        #define fdopen(fd,type)  _fdopen(fd,type)
    #endif
#endif

        /* common defaults */

#ifndef OS_CODE
    #define OS_CODE  0x03  /* assume Unix */
#endif

#ifndef F_OPEN
    #define F_OPEN(name, mode) fopen((name), (mode))
#endif

         /* functions */

#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
    #ifndef HAVE_VSNPRINTF
        #define HAVE_VSNPRINTF
    #endif
#endif

#if defined(__CYGWIN__)
    #ifndef HAVE_VSNPRINTF
        #define HAVE_VSNPRINTF
    #endif
#endif

#ifndef HAVE_VSNPRINTF
    #ifdef MSDOS
       /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
          but for now we just assume it doesn't. */
        #define NO_vsnprintf
    #endif
    #ifdef __TURBOC__
        #define NO_vsnprintf
    #endif
    #ifdef WIN32
       /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
        #if !defined(vsnprintf) && !defined(NO_vsnprintf)
            #define vsnprintf _vsnprintf
        #endif
    #endif
    #ifdef __SASC
        #define NO_vsnprintf
    #endif
#endif

#ifdef VMS
    #define NO_vsnprintf
#endif

#ifdef HAVE_STRERROR
    #ifndef VMS
         extern char *strerror(int);
    #endif
    #define zstrerror(errnum) strerror(errnum)
#else
    #define zstrerror(errnum) ""
#endif

#if defined(pyr)
    #define NO_MEMCPY
#endif

#if defined(SMALL_MEDIUM) && !defined(_MSC_VER) && !defined(__SC__)
 /* Use our own functions for small and medium model with MSC <= 5.0.
  * You may have to use the same strategy for Borland C (untested).
  * The __SC__ check is for Symantec.
  */
    #define NO_MEMCPY
#endif

#if defined(STDC) && !defined(HAVE_MEMCPY) && !defined(NO_MEMCPY)
    #define HAVE_MEMCPY
#endif

#ifdef HAVE_MEMCPY
    #ifdef SMALL_MEDIUM /* MSDOS small or medium model */
        #define zmemcpy _fmemcpy
        #define zmemcmp _fmemcmp
        #define zmemzero(dest, len) _fmemset(dest, 0, len)
    #else
        #define zmemcpy memcpy
        #define zmemcmp memcmp
        #define zmemzero(dest, len) memset(dest, 0, len)
    #endif
#else
   extern void zmemcpy(Bytef* dest, const Bytef* source, uInt len);
   extern int  zmemcmp(const Bytef* s1, const Bytef* s2, uInt len);
   extern void zmemzero(Bytef* dest, uInt len);
#endif

/* Diagnostic functions */
#ifdef DEBUG
    #include <stdio.h>
    extern int z_verbose;
    extern void z_error(char *m);
    #define Assert(cond,msg) {if(!(cond)) z_error(msg);}
    #define Trace(x) {if (z_verbose>=0) fprintf x ;}
    #define Tracev(x) {if (z_verbose>0) fprintf x ;}
    #define Tracevv(x) {if (z_verbose>1) fprintf x ;}
    #define Tracec(c,x) {if (z_verbose>0 && (c)) fprintf x ;}
    #define Tracecv(c,x) {if (z_verbose>1 && (c)) fprintf x ;}
#else
    #define Assert(cond,msg)
    #define Trace(x)
    #define Tracev(x)
    #define Tracevv(x)
    #define Tracec(c,x)
    #define Tracecv(c,x)
#endif


voidpf zcalloc(voidpf opaque, unsigned items, unsigned size);
void   zcfree(voidpf opaque, voidpf ptr);

#define ZALLOC(strm, items, size) (*((strm)->zalloc))((strm)->opaque, (items), (size))
#define ZFREE(strm, addr)  (*((strm)->zfree))((strm)->opaque, (voidpf)(addr))
#define TRY_FREE(s, p) {if (p) ZFREE(s, p);}

#endif /* ZUTIL_H */