Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/libjpeg/jinclude.h @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * jinclude.h
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3 *
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4 * Copyright (C) 1991-1994, Thomas G. Lane.
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5 * Modified 2017-2022 by Guido Vollbeding.
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6 * This file is part of the Independent JPEG Group's software.
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7 * For conditions of distribution and use, see the accompanying README file.
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8 *
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9 * This file exists to provide a single place to fix any problems with
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10 * including the wrong system include files. (Common problems are taken
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11 * care of by the standard jconfig symbols, but on really weird systems
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12 * you may have to edit this file.)
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13 *
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14 * NOTE: this file is NOT intended to be included by applications using
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15 * the JPEG library. Most applications need only include jpeglib.h.
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16 */
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19 /* Include auto-config file to find out which system include files we need. */
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21 #include "jconfig.h" /* auto configuration options */
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22 #define JCONFIG_INCLUDED /* so that jpeglib.h doesn't do it again */
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24 /*
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25 * We need the NULL macro and size_t typedef.
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26 * On an ANSI-conforming system it is sufficient to include <stddef.h>.
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27 * Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to
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28 * pull in <sys/types.h> as well.
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29 * Note that the core JPEG library does not require <stdio.h>;
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30 * only the default error handler and data source/destination modules do.
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31 * But we must pull it in because of the references to FILE in jpeglib.h.
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32 * You can remove those references if you want to compile without <stdio.h>.
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33 */
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35 #ifdef HAVE_STDDEF_H
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36 #include <stddef.h>
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37 #endif
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39 #ifdef HAVE_STDLIB_H
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40 #include <stdlib.h>
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41 #endif
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43 #ifdef NEED_SYS_TYPES_H
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44 #include <sys/types.h>
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45 #endif
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47 #include <stdio.h>
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49 /*
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50 * We need memory copying and zeroing functions, plus strncpy().
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51 * ANSI and System V implementations declare these in <string.h>.
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52 * BSD doesn't have the mem() functions, but it does have bcopy()/bzero().
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53 * Some systems may declare memset and memcpy in <memory.h>.
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54 *
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55 * NOTE: we assume the size parameters to these functions are of type size_t.
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56 * Change the casts in these macros if not!
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57 */
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59 #ifdef NEED_BSD_STRINGS
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61 #include <strings.h>
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62 #define MEMZERO(target,size) bzero((void *)(target), (size_t)(size))
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63 #define MEMCOPY(dest,src,size) bcopy((const void *)(src), (void *)(dest), (size_t)(size))
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65 #else /* not BSD, assume ANSI/SysV string lib */
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67 #include <string.h>
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68 #define MEMZERO(target,size) memset((void *)(target), 0, (size_t)(size))
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69 #define MEMCOPY(dest,src,size) memcpy((void *)(dest), (const void *)(src), (size_t)(size))
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71 #endif
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73 /*
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74 * In ANSI C, and indeed any rational implementation, size_t is also the
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75 * type returned by sizeof(). However, it seems there are some irrational
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76 * implementations out there, in which sizeof() returns an int even though
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77 * size_t is defined as long or unsigned long. To ensure consistent results
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78 * we always use this SIZEOF() macro in place of using sizeof() directly.
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79 */
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81 #define SIZEOF(object) ((size_t) sizeof(object))
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83 /*
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84 * The modules that use fread() and fwrite() always invoke them through
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85 * these macros. On some systems you may need to twiddle the argument casts.
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86 * CAUTION: argument order is different from underlying functions!
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87 *
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88 * Furthermore, macros are provided for fflush() and ferror() in order
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89 * to facilitate adaption by applications using an own FILE class.
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90 *
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91 * You can define your own custom file I/O functions in jconfig.h and
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92 * #define JPEG_HAVE_FILE_IO_CUSTOM there to prevent redefinition here.
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93 *
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94 * You can #define JPEG_USE_FILE_IO_CUSTOM in jconfig.h to use custom file
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95 * I/O functions implemented in Delphi VCL (Visual Component Library)
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96 * in Vcl.Imaging.jpeg.pas for the TJPEGImage component utilizing
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97 * the Delphi RTL (Run-Time Library) TMemoryStream component:
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98 *
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99 * procedure jpeg_stdio_src(var cinfo: jpeg_decompress_struct;
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100 * input_file: TStream); external;
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101 *
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102 * procedure jpeg_stdio_dest(var cinfo: jpeg_compress_struct;
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103 * output_file: TStream); external;
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104 *
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105 * function jfread(var buf; recsize, reccount: Integer; S: TStream): Integer;
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106 * begin
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107 * Result := S.Read(buf, recsize * reccount);
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108 * end;
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109 *
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110 * function jfwrite(const buf; recsize, reccount: Integer; S: TStream): Integer;
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111 * begin
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112 * Result := S.Write(buf, recsize * reccount);
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113 * end;
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114 *
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115 * function jfflush(S: TStream): Integer;
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116 * begin
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117 * Result := 0;
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118 * end;
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119 *
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120 * function jferror(S: TStream): Integer;
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121 * begin
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122 * Result := 0;
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123 * end;
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124 *
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125 * TMemoryStream of Delphi RTL has the distinctive feature to provide dynamic
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126 * memory buffer management with a file/stream-based interface, particularly for
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127 * the write (output) operation, which is easier to apply compared with direct
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128 * implementations as given in jdatadst.c for memory destination. Those direct
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129 * implementations of dynamic memory write tend to be more difficult to use,
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130 * so providing an option like TMemoryStream may be a useful alternative.
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131 *
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132 * The CFile/CMemFile classes of the Microsoft Foundation Class (MFC) Library
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133 * may be used in a similar fashion.
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134 */
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135
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136 #ifndef JPEG_HAVE_FILE_IO_CUSTOM
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137 #ifdef JPEG_USE_FILE_IO_CUSTOM
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138 extern size_t jfread(void * __ptr, size_t __size, size_t __n, FILE * __stream);
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139 extern size_t jfwrite(const void * __ptr, size_t __size, size_t __n, FILE * __stream);
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140 extern int jfflush(FILE * __stream);
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141 extern int jferror(FILE * __fp);
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142
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143 #define JFREAD(file,buf,sizeofbuf) \
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144 ((size_t) jfread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
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145 #define JFWRITE(file,buf,sizeofbuf) \
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146 ((size_t) jfwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
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147 #define JFFLUSH(file) jfflush(file)
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148 #define JFERROR(file) jferror(file)
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149 #else
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150 #define JFREAD(file,buf,sizeofbuf) \
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151 ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
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152 #define JFWRITE(file,buf,sizeofbuf) \
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153 ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
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154 #define JFFLUSH(file) fflush(file)
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155 #define JFERROR(file) ferror(file)
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156 #endif
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157 #endif