jinclude.h (3250B)
1 /* 2 * jinclude.h 3 * 4 * Copyright (C) 1991-1994, Thomas G. Lane. 5 * This file is part of the Independent JPEG Group's software. 6 * For conditions of distribution and use, see the accompanying README file. 7 * 8 * This file exists to provide a single place to fix any problems with 9 * including the wrong system include files. (Common problems are taken 10 * care of by the standard jconfig symbols, but on really weird systems 11 * you may have to edit this file.) 12 * 13 * NOTE: this file is NOT intended to be included by applications using the 14 * JPEG library. Most applications need only include jpeglib.h. 15 */ 16 17 18 /* Include auto-config file to find out which system include files we need. */ 19 20 #include "jconfig.h" /* auto configuration options */ 21 #define JCONFIG_INCLUDED /* so that jpeglib.h doesn't do it again */ 22 23 /* 24 * We need the NULL macro and size_t typedef. 25 * On an ANSI-conforming system it is sufficient to include <stddef.h>. 26 * Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to 27 * pull in <sys/types.h> as well. 28 * Note that the core JPEG library does not require <stdio.h>; 29 * only the default error handler and data source/destination modules do. 30 * But we must pull it in because of the references to FILE in jpeglib.h. 31 * You can remove those references if you want to compile without <stdio.h>. 32 */ 33 34 #ifdef HAVE_STDDEF_H 35 #include <stddef.h> 36 #endif 37 38 #ifdef HAVE_STDLIB_H 39 #include <stdlib.h> 40 #endif 41 42 #ifdef NEED_SYS_TYPES_H 43 #include <sys/types.h> 44 #endif 45 46 #include <stdio.h> 47 48 /* 49 * We need memory copying and zeroing functions, plus strncpy(). 50 * ANSI and System V implementations declare these in <string.h>. 51 * BSD doesn't have the mem() functions, but it does have bcopy()/bzero(). 52 * Some systems may declare memset and memcpy in <memory.h>. 53 * 54 * NOTE: we assume the size parameters to these functions are of type size_t. 55 * Change the casts in these macros if not! 56 */ 57 58 #ifdef NEED_BSD_STRINGS 59 60 #include <strings.h> 61 #define MEMZERO(target,size) bzero((void *)(target), (size_t)(size)) 62 #define MEMCOPY(dest,src,size) bcopy((const void *)(src), (void *)(dest), (size_t)(size)) 63 64 #else /* not BSD, assume ANSI/SysV string lib */ 65 66 #include <string.h> 67 #define MEMZERO(target,size) memset((void *)(target), 0, (size_t)(size)) 68 #define MEMCOPY(dest,src,size) memcpy((void *)(dest), (const void *)(src), (size_t)(size)) 69 70 #endif 71 72 /* 73 * In ANSI C, and indeed any rational implementation, size_t is also the 74 * type returned by sizeof(). However, it seems there are some irrational 75 * implementations out there, in which sizeof() returns an int even though 76 * size_t is defined as long or unsigned long. To ensure consistent results 77 * we always use this SIZEOF() macro in place of using sizeof() directly. 78 */ 79 80 #define SIZEOF(object) ((size_t) sizeof(object)) 81 82 /* 83 * The modules that use fread() and fwrite() always invoke them through 84 * these macros. On some systems you may need to twiddle the argument casts. 85 * CAUTION: argument order is different from underlying functions! 86 */ 87 88 #define JFREAD(file,buf,sizeofbuf) \ 89 ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file))) 90 #define JFWRITE(file,buf,sizeofbuf) \ 91 ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))