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| 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), (siz
e_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
))) |
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