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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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