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comparison mupdf-source/thirdparty/libjpeg/jinclude.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /*
2 * jinclude.h
3 *
4 * Copyright (C) 1991-1994, Thomas G. Lane.
5 * Modified 2017-2022 by Guido Vollbeding.
6 * This file is part of the Independent JPEG Group's software.
7 * For conditions of distribution and use, see the accompanying README file.
8 *
9 * This file exists to provide a single place to fix any problems with
10 * including the wrong system include files. (Common problems are taken
11 * care of by the standard jconfig symbols, but on really weird systems
12 * you may have to edit this file.)
13 *
14 * NOTE: this file is NOT intended to be included by applications using
15 * the JPEG library. Most applications need only include jpeglib.h.
16 */
17
18
19 /* Include auto-config file to find out which system include files we need. */
20
21 #include "jconfig.h" /* auto configuration options */
22 #define JCONFIG_INCLUDED /* so that jpeglib.h doesn't do it again */
23
24 /*
25 * We need the NULL macro and size_t typedef.
26 * On an ANSI-conforming system it is sufficient to include <stddef.h>.
27 * Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to
28 * pull in <sys/types.h> as well.
29 * Note that the core JPEG library does not require <stdio.h>;
30 * only the default error handler and data source/destination modules do.
31 * But we must pull it in because of the references to FILE in jpeglib.h.
32 * You can remove those references if you want to compile without <stdio.h>.
33 */
34
35 #ifdef HAVE_STDDEF_H
36 #include <stddef.h>
37 #endif
38
39 #ifdef HAVE_STDLIB_H
40 #include <stdlib.h>
41 #endif
42
43 #ifdef NEED_SYS_TYPES_H
44 #include <sys/types.h>
45 #endif
46
47 #include <stdio.h>
48
49 /*
50 * We need memory copying and zeroing functions, plus strncpy().
51 * ANSI and System V implementations declare these in <string.h>.
52 * BSD doesn't have the mem() functions, but it does have bcopy()/bzero().
53 * Some systems may declare memset and memcpy in <memory.h>.
54 *
55 * NOTE: we assume the size parameters to these functions are of type size_t.
56 * Change the casts in these macros if not!
57 */
58
59 #ifdef NEED_BSD_STRINGS
60
61 #include <strings.h>
62 #define MEMZERO(target,size) bzero((void *)(target), (size_t)(size))
63 #define MEMCOPY(dest,src,size) bcopy((const void *)(src), (void *)(dest), (size_t)(size))
64
65 #else /* not BSD, assume ANSI/SysV string lib */
66
67 #include <string.h>
68 #define MEMZERO(target,size) memset((void *)(target), 0, (size_t)(size))
69 #define MEMCOPY(dest,src,size) memcpy((void *)(dest), (const void *)(src), (size_t)(size))
70
71 #endif
72
73 /*
74 * In ANSI C, and indeed any rational implementation, size_t is also the
75 * type returned by sizeof(). However, it seems there are some irrational
76 * implementations out there, in which sizeof() returns an int even though
77 * size_t is defined as long or unsigned long. To ensure consistent results
78 * we always use this SIZEOF() macro in place of using sizeof() directly.
79 */
80
81 #define SIZEOF(object) ((size_t) sizeof(object))
82
83 /*
84 * The modules that use fread() and fwrite() always invoke them through
85 * these macros. On some systems you may need to twiddle the argument casts.
86 * CAUTION: argument order is different from underlying functions!
87 *
88 * Furthermore, macros are provided for fflush() and ferror() in order
89 * to facilitate adaption by applications using an own FILE class.
90 *
91 * You can define your own custom file I/O functions in jconfig.h and
92 * #define JPEG_HAVE_FILE_IO_CUSTOM there to prevent redefinition here.
93 *
94 * You can #define JPEG_USE_FILE_IO_CUSTOM in jconfig.h to use custom file
95 * I/O functions implemented in Delphi VCL (Visual Component Library)
96 * in Vcl.Imaging.jpeg.pas for the TJPEGImage component utilizing
97 * the Delphi RTL (Run-Time Library) TMemoryStream component:
98 *
99 * procedure jpeg_stdio_src(var cinfo: jpeg_decompress_struct;
100 * input_file: TStream); external;
101 *
102 * procedure jpeg_stdio_dest(var cinfo: jpeg_compress_struct;
103 * output_file: TStream); external;
104 *
105 * function jfread(var buf; recsize, reccount: Integer; S: TStream): Integer;
106 * begin
107 * Result := S.Read(buf, recsize * reccount);
108 * end;
109 *
110 * function jfwrite(const buf; recsize, reccount: Integer; S: TStream): Integer;
111 * begin
112 * Result := S.Write(buf, recsize * reccount);
113 * end;
114 *
115 * function jfflush(S: TStream): Integer;
116 * begin
117 * Result := 0;
118 * end;
119 *
120 * function jferror(S: TStream): Integer;
121 * begin
122 * Result := 0;
123 * end;
124 *
125 * TMemoryStream of Delphi RTL has the distinctive feature to provide dynamic
126 * memory buffer management with a file/stream-based interface, particularly for
127 * the write (output) operation, which is easier to apply compared with direct
128 * implementations as given in jdatadst.c for memory destination. Those direct
129 * implementations of dynamic memory write tend to be more difficult to use,
130 * so providing an option like TMemoryStream may be a useful alternative.
131 *
132 * The CFile/CMemFile classes of the Microsoft Foundation Class (MFC) Library
133 * may be used in a similar fashion.
134 */
135
136 #ifndef JPEG_HAVE_FILE_IO_CUSTOM
137 #ifdef JPEG_USE_FILE_IO_CUSTOM
138 extern size_t jfread(void * __ptr, size_t __size, size_t __n, FILE * __stream);
139 extern size_t jfwrite(const void * __ptr, size_t __size, size_t __n, FILE * __stream);
140 extern int jfflush(FILE * __stream);
141 extern int jferror(FILE * __fp);
142
143 #define JFREAD(file,buf,sizeofbuf) \
144 ((size_t) jfread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
145 #define JFWRITE(file,buf,sizeofbuf) \
146 ((size_t) jfwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
147 #define JFFLUSH(file) jfflush(file)
148 #define JFERROR(file) jferror(file)
149 #else
150 #define JFREAD(file,buf,sizeofbuf) \
151 ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
152 #define JFWRITE(file,buf,sizeofbuf) \
153 ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
154 #define JFFLUSH(file) fflush(file)
155 #define JFERROR(file) ferror(file)
156 #endif
157 #endif