|
|
/*
* 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>. */
#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef NEED_SYS_TYPES_H
#include <sys/types.h>
#endif
#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! */
#ifdef NEED_BSD_STRINGS
#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))
#endif
/*
* 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)))
|
