00001 /* 00002 * jinclude.h 00003 * 00004 * Copyright (C) 1991-1994, Thomas G. Lane. 00005 * This file is part of the Independent JPEG Group's software. 00006 * For conditions of distribution and use, see the accompanying README file. 00007 * 00008 * This file exists to provide a single place to fix any problems with 00009 * including the wrong system include files. (Common problems are taken 00010 * care of by the standard jconfig symbols, but on really weird systems 00011 * you may have to edit this file.) 00012 * 00013 * NOTE: this file is NOT intended to be included by applications using the 00014 * JPEG library. Most applications need only include jpeglib.h. 00015 */ 00016 00017 00018 /* Include auto-config file to find out which system include files we need. */ 00019 00020 #include "jconfig.h" /* auto configuration options */ 00021 #define JCONFIG_INCLUDED /* so that jpeglib.h doesn't do it again */ 00022 00023 /* 00024 * We need the NULL macro and size_t typedef. 00025 * On an ANSI-conforming system it is sufficient to include <stddef.h>. 00026 * Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to 00027 * pull in <sys/types.h> as well. 00028 * Note that the core JPEG library does not require <stdio.h>; 00029 * only the default error handler and data source/destination modules do. 00030 * But we must pull it in because of the references to FILE in jpeglib.h. 00031 * You can remove those references if you want to compile without <stdio.h>. 00032 */ 00033 00034 #ifdef HAVE_STDDEF_H 00035 #include <stddef.h> 00036 #endif 00037 00038 #ifdef HAVE_STDLIB_H 00039 #include <stdlib.h> 00040 #endif 00041 00042 #ifdef NEED_SYS_TYPES_H 00043 #include <sys/types.h> 00044 #endif 00045 00046 #include <stdio.h> 00047 00048 /* 00049 * We need memory copying and zeroing functions, plus strncpy(). 00050 * ANSI and System V implementations declare these in <string.h>. 00051 * BSD doesn't have the mem() functions, but it does have bcopy()/bzero(). 00052 * Some systems may declare memset and memcpy in <memory.h>. 00053 * 00054 * NOTE: we assume the size parameters to these functions are of type size_t. 00055 * Change the casts in these macros if not! 00056 */ 00057 00058 #ifdef NEED_BSD_STRINGS 00059 00060 #include <strings.h> 00061 #define MEMZERO(target,size) bzero((void *)(target), (size_t)(size)) 00062 #define MEMCOPY(dest,src,size) bcopy((const void *)(src), (void *)(dest), (size_t)(size)) 00063 00064 #else /* not BSD, assume ANSI/SysV string lib */ 00065 00066 #include <string.h> 00067 #define MEMZERO(target,size) memset((void *)(target), 0, (size_t)(size)) 00068 #define MEMCOPY(dest,src,size) memcpy((void *)(dest), (const void *)(src), (size_t)(size)) 00069 00070 #endif 00071 00072 /* 00073 * In ANSI C, and indeed any rational implementation, size_t is also the 00074 * type returned by sizeof(). However, it seems there are some irrational 00075 * implementations out there, in which sizeof() returns an int even though 00076 * size_t is defined as long or unsigned long. To ensure consistent results 00077 * we always use this SIZEOF() macro in place of using sizeof() directly. 00078 */ 00079 00080 #define SIZEOF(object) ((size_t) sizeof(object)) 00081 00082 /* 00083 * The modules that use fread() and fwrite() always invoke them through 00084 * these macros. On some systems you may need to twiddle the argument casts. 00085 * CAUTION: argument order is different from underlying functions! 00086 */ 00087 00088 #define JFREAD(file,buf,sizeofbuf) \ 00089 ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file))) 00090 #define JFWRITE(file,buf,sizeofbuf) \ 00091 ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))