Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/libjpeg/jerror.c @ 22:d77477b4e151

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Let _int_rc() also handle (i.e. ignore) a local version suffix
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 12:05:57 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * jerror.c
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3 *
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4 * Copyright (C) 1991-1998, Thomas G. Lane.
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5 * Modified 2012-2015 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 contains simple error-reporting and trace-message routines.
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10 * These are suitable for Unix-like systems and others where writing to
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11 * stderr is the right thing to do. Many applications will want to replace
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12 * some or all of these routines.
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13 *
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14 * If you define USE_WINDOWS_MESSAGEBOX in jconfig.h or in the makefile,
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15 * you get a Windows-specific hack to display error messages in a dialog box.
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16 * It ain't much, but it beats dropping error messages into the bit bucket,
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17 * which is what happens to output to stderr under most Windows C compilers.
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18 *
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19 * These routines are used by both the compression and decompression code.
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20 */
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22 #ifdef USE_WINDOWS_MESSAGEBOX
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23 #include <windows.h>
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24 #endif
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26 /* this is not a core library module, so it doesn't define JPEG_INTERNALS */
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27 #include "jinclude.h"
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28 #include "jpeglib.h"
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29 #include "jversion.h"
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30 #include "jerror.h"
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32 #ifndef EXIT_FAILURE /* define exit() codes if not provided */
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33 #define EXIT_FAILURE 1
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34 #endif
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37 /*
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38 * Create the message string table.
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39 * We do this from the master message list in jerror.h by re-reading
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40 * jerror.h with a suitable definition for macro JMESSAGE.
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41 * The message table is made an external symbol just in case any applications
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42 * want to refer to it directly.
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43 */
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45 #ifdef NEED_SHORT_EXTERNAL_NAMES
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46 #define jpeg_std_message_table jMsgTable
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47 #endif
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49 #define JMESSAGE(code,string) string ,
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51 const char * const jpeg_std_message_table[] = {
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52 #include "jerror.h"
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53 NULL
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54 };
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55
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57 /*
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58 * Error exit handler: must not return to caller.
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59 *
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60 * Applications may override this if they want to get control back after
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61 * an error. Typically one would longjmp somewhere instead of exiting.
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62 * The setjmp buffer can be made a private field within an expanded error
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63 * handler object. Note that the info needed to generate an error message
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64 * is stored in the error object, so you can generate the message now or
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65 * later, at your convenience.
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66 * You should make sure that the JPEG object is cleaned up (with jpeg_abort
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67 * or jpeg_destroy) at some point.
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68 */
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69
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70 METHODDEF(noreturn_t)
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71 error_exit (j_common_ptr cinfo)
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72 {
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73 /* Always display the message */
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74 (*cinfo->err->output_message) (cinfo);
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75
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76 /* Let the memory manager delete any temp files before we die */
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77 jpeg_destroy(cinfo);
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78
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79 exit(EXIT_FAILURE);
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80 }
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81
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82
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83 /*
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84 * Actual output of an error or trace message.
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85 * Applications may override this method to send JPEG messages somewhere
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86 * other than stderr.
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87 *
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88 * On Windows, printing to stderr is generally completely useless,
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89 * so we provide optional code to produce an error-dialog popup.
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90 * Most Windows applications will still prefer to override this routine,
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91 * but if they don't, it'll do something at least marginally useful.
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92 *
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93 * NOTE: to use the library in an environment that doesn't support the
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94 * C stdio library, you may have to delete the call to fprintf() entirely,
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95 * not just not use this routine.
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96 */
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97
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98 METHODDEF(void)
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99 output_message (j_common_ptr cinfo)
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100 {
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101 char buffer[JMSG_LENGTH_MAX];
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102
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103 /* Create the message */
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104 (*cinfo->err->format_message) (cinfo, buffer);
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105
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106 #ifdef USE_WINDOWS_MESSAGEBOX
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107 /* Display it in a message dialog box */
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108 MessageBox(GetActiveWindow(), buffer, "JPEG Library Error",
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109 MB_OK | MB_ICONERROR);
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110 #else
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111 /* Send it to stderr, adding a newline */
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112 fprintf(stderr, "%s\n", buffer);
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113 #endif
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114 }
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115
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116
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117 /*
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118 * Decide whether to emit a trace or warning message.
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119 * msg_level is one of:
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120 * -1: recoverable corrupt-data warning, may want to abort.
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121 * 0: important advisory messages (always display to user).
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122 * 1: first level of tracing detail.
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123 * 2,3,...: successively more detailed tracing messages.
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124 * An application might override this method if it wanted to abort on warnings
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125 * or change the policy about which messages to display.
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126 */
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127
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128 METHODDEF(void)
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129 emit_message (j_common_ptr cinfo, int msg_level)
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130 {
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131 struct jpeg_error_mgr * err = cinfo->err;
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132
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133 if (msg_level < 0) {
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134 /* It's a warning message. Since corrupt files may generate many warnings,
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135 * the policy implemented here is to show only the first warning,
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136 * unless trace_level >= 3.
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137 */
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138 if (err->num_warnings == 0 || err->trace_level >= 3)
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139 (*err->output_message) (cinfo);
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140 /* Always count warnings in num_warnings. */
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141 err->num_warnings++;
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142 } else {
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143 /* It's a trace message. Show it if trace_level >= msg_level. */
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144 if (err->trace_level >= msg_level)
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145 (*err->output_message) (cinfo);
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146 }
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147 }
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148
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149
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150 /*
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151 * Format a message string for the most recent JPEG error or message.
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152 * The message is stored into buffer, which should be at least JMSG_LENGTH_MAX
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153 * characters. Note that no '\n' character is added to the string.
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154 * Few applications should need to override this method.
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155 */
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156
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157 METHODDEF(void)
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158 format_message (j_common_ptr cinfo, char * buffer)
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159 {
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160 struct jpeg_error_mgr * err = cinfo->err;
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161 int msg_code = err->msg_code;
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162 const char * msgtext = NULL;
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163 const char * msgptr;
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164 char ch;
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165 boolean isstring;
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166
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167 /* Look up message string in proper table */
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168 if (msg_code > 0 && msg_code <= err->last_jpeg_message) {
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169 msgtext = err->jpeg_message_table[msg_code];
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170 } else if (err->addon_message_table != NULL &&
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171 msg_code >= err->first_addon_message &&
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172 msg_code <= err->last_addon_message) {
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173 msgtext = err->addon_message_table[msg_code - err->first_addon_message];
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174 }
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175
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176 /* Defend against bogus message number */
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177 if (msgtext == NULL) {
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178 err->msg_parm.i[0] = msg_code;
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179 msgtext = err->jpeg_message_table[0];
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180 }
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181
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diff changeset
182 /* Check for string parameter, as indicated by %s in the message text */
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183 isstring = FALSE;
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184 msgptr = msgtext;
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diff changeset
185 while ((ch = *msgptr++) != '\0') {
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186 if (ch == '%') {
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diff changeset
187 if (*msgptr == 's') isstring = TRUE;
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parents:
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188 break;
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189 }
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190 }
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191
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diff changeset
192 /* Format the message into the passed buffer */
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193 if (isstring)
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diff changeset
194 sprintf(buffer, msgtext, err->msg_parm.s);
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195 else
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diff changeset
196 sprintf(buffer, msgtext,
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diff changeset
197 err->msg_parm.i[0], err->msg_parm.i[1],
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diff changeset
198 err->msg_parm.i[2], err->msg_parm.i[3],
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diff changeset
199 err->msg_parm.i[4], err->msg_parm.i[5],
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parents:
diff changeset
200 err->msg_parm.i[6], err->msg_parm.i[7]);
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parents:
diff changeset
201 }
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202
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203
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204 /*
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205 * Reset error state variables at start of a new image.
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206 * This is called during compression startup to reset trace/error
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207 * processing to default state, without losing any application-specific
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208 * method pointers. An application might possibly want to override
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209 * this method if it has additional error processing state.
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210 */
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211
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212 METHODDEF(void)
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213 reset_error_mgr (j_common_ptr cinfo)
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214 {
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215 cinfo->err->num_warnings = 0;
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216 /* trace_level is not reset since it is an application-supplied parameter */
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217 cinfo->err->msg_code = 0; /* may be useful as a flag for "no error" */
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218 }
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219
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220
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221 /*
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222 * Fill in the standard error-handling methods in a jpeg_error_mgr object.
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223 * Typical call is:
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224 * struct jpeg_compress_struct cinfo;
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225 * struct jpeg_error_mgr err;
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226 *
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227 * cinfo.err = jpeg_std_error(&err);
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228 * after which the application may override some of the methods.
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229 */
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230
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231 GLOBAL(struct jpeg_error_mgr *)
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232 jpeg_std_error (struct jpeg_error_mgr * err)
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233 {
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234 err->error_exit = error_exit;
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235 err->emit_message = emit_message;
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236 err->output_message = output_message;
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237 err->format_message = format_message;
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238 err->reset_error_mgr = reset_error_mgr;
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239
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240 err->msg_code = 0; /* may be useful as a flag for "no error" */
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241 err->msg_parm.i[0] = 0; /* initialize 8 int message parameters */
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242 err->msg_parm.i[1] = 0;
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243 err->msg_parm.i[2] = 0;
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244 err->msg_parm.i[3] = 0;
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245 err->msg_parm.i[4] = 0;
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246 err->msg_parm.i[5] = 0;
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247 err->msg_parm.i[6] = 0;
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248 err->msg_parm.i[7] = 0;
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249
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250 err->trace_level = 0; /* default = no tracing */
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251 err->num_warnings = 0; /* no warnings emitted yet */
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252
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253 /* Initialize message table pointers */
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254 err->jpeg_message_table = jpeg_std_message_table;
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255 err->last_jpeg_message = (int) JMSG_LASTMSGCODE - 1;
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256
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257 err->addon_message_table = NULL;
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258 err->first_addon_message = 0; /* for safety */
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259 err->last_addon_message = 0;
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260
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261 return err;
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262 }