www.pudn.com > imgport.rar > jinclude.h, change:2008-11-05,size:3341b

 * jinclude.h 
 * Copyright (C) 1991-1994, Thomas G. Lane. 
 * This file is part of the Independent JPEG Group's software. 
 * For conditions of distribution and use, see the accompanying README file. 
 * This file exists to provide a single place to fix any problems with 
 * including the wrong system include files.  (Common problems are taken 
 * care of by the standard jconfig symbols, but on really weird systems 
 * you may have to edit this file.) 
 * NOTE: this file is NOT intended to be included by applications using the 
 * JPEG library.  Most applications need only include jpeglib.h. 
/* Include auto-config file to find out which system include files we need. */ 
#include "jconfig.h"		/* auto configuration options */ 
#define JCONFIG_INCLUDED	/* so that jpeglib.h doesn't do it again */ 
 * We need the NULL macro and size_t typedef. 
 * On an ANSI-conforming system it is sufficient to include <stddef.h>. 
 * Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to 
 * pull in <sys/types.h> as well. 
 * Note that the core JPEG library does not require <stdio.h>; 
 * only the default error handler and data source/destination modules do. 
 * But we must pull it in because of the references to FILE in jpeglib.h. 
 * You can remove those references if you want to compile without <stdio.h>. 
#include <stddef.h> 
#include <stdlib.h> 
#include <sys/types.h> 
#include <stdio.h> 
 * We need memory copying and zeroing functions, plus strncpy(). 
 * ANSI and System V implementations declare these in <string.h>. 
 * BSD doesn't have the mem() functions, but it does have bcopy()/bzero(). 
 * Some systems may declare memset and memcpy in <memory.h>. 
 * NOTE: we assume the size parameters to these functions are of type size_t. 
 * Change the casts in these macros if not! 
#include <strings.h> 
#define MEMZERO(target,size)	bzero((void *)(target), (size_t)(size)) 
#define MEMCOPY(dest,src,size)	bcopy((const void *)(src), (void *)(dest), (size_t)(size)) 
#else /* not BSD, assume ANSI/SysV string lib */ 
#include <string.h> 
#define MEMZERO(target,size)	memset((void *)(target), 0, (size_t)(size)) 
#define MEMCOPY(dest,src,size)	memcpy((void *)(dest), (const void *)(src), (size_t)(size)) 
 * In ANSI C, and indeed any rational implementation, size_t is also the 
 * type returned by sizeof().  However, it seems there are some irrational 
 * implementations out there, in which sizeof() returns an int even though 
 * size_t is defined as long or unsigned long.  To ensure consistent results 
 * we always use this SIZEOF() macro in place of using sizeof() directly. 
#define SIZEOF(object)	((size_t) sizeof(object)) 
 * The modules that use fread() and fwrite() always invoke them through 
 * these macros.  On some systems you may need to twiddle the argument casts. 
 * CAUTION: argument order is different from underlying functions! 
#define JFREAD(file,buf,sizeofbuf)  \ 
  ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file))) 
#define JFWRITE(file,buf,sizeofbuf)  \ 
  ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))