2 * CDE - Common Desktop Environment
4 * Copyright (c) 1993-2012, The Open Group. All rights reserved.
6 * These libraries and programs are free software; you can
7 * redistribute them and/or modify them under the terms of the GNU
8 * Lesser General Public License as published by the Free Software
9 * Foundation; either version 2 of the License, or (at your option)
12 * These libraries and programs are distributed in the hope that
13 * they will be useful, but WITHOUT ANY WARRANTY; without even the
14 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
15 * PURPOSE. See the GNU Lesser General Public License for more
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with these librararies and programs; if not, write
20 * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
21 * Floor, Boston, MA 02110-1301 USA
23 /* $XConsortium: jerror.c /main/2 1996/05/09 03:50:22 drk $ */
27 * Copyright (C) 1991-1996, Thomas G. Lane.
28 * This file is part of the Independent JPEG Group's software.
29 * For conditions of distribution and use, see the accompanying README file.
31 * This file contains simple error-reporting and trace-message routines.
32 * These are suitable for Unix-like systems and others where writing to
33 * stderr is the right thing to do. Many applications will want to replace
34 * some or all of these routines.
36 * These routines are used by both the compression and decompression code.
39 /* this is not a core library module, so it doesn't define JPEG_INTERNALS */
45 #ifndef EXIT_FAILURE /* define exit() codes if not provided */
46 #define EXIT_FAILURE 1
51 * Create the message string table.
52 * We do this from the master message list in jerror.h by re-reading
53 * jerror.h with a suitable definition for macro JMESSAGE.
54 * The message table is made an external symbol just in case any applications
55 * want to refer to it directly.
58 #ifdef NEED_SHORT_EXTERNAL_NAMES
59 #define jpeg_std_message_table jMsgTable
62 #define JMESSAGE(code,string) string ,
64 const char * const jpeg_std_message_table[] = {
71 * Error exit handler: must not return to caller.
73 * Applications may override this if they want to get control back after
74 * an error. Typically one would longjmp somewhere instead of exiting.
75 * The setjmp buffer can be made a private field within an expanded error
76 * handler object. Note that the info needed to generate an error message
77 * is stored in the error object, so you can generate the message now or
78 * later, at your convenience.
79 * You should make sure that the JPEG object is cleaned up (with jpeg_abort
80 * or jpeg_destroy) at some point.
84 error_exit (j_common_ptr cinfo)
86 /* Always display the message */
87 (*cinfo->err->output_message) (cinfo);
89 /* Let the memory manager delete any temp files before we die */
97 * Actual output of an error or trace message.
98 * Applications may override this method to send JPEG messages somewhere
103 output_message (j_common_ptr cinfo)
105 char buffer[JMSG_LENGTH_MAX];
107 /* Create the message */
108 (*cinfo->err->format_message) (cinfo, buffer);
110 /* Send it to stderr, adding a newline */
111 fprintf(stderr, "%s\n", buffer);
116 * Decide whether to emit a trace or warning message.
117 * msg_level is one of:
118 * -1: recoverable corrupt-data warning, may want to abort.
119 * 0: important advisory messages (always display to user).
120 * 1: first level of tracing detail.
121 * 2,3,...: successively more detailed tracing messages.
122 * An application might override this method if it wanted to abort on warnings
123 * or change the policy about which messages to display.
127 emit_message (j_common_ptr cinfo, int msg_level)
129 struct jpeg_error_mgr * err = cinfo->err;
132 /* It's a warning message. Since corrupt files may generate many warnings,
133 * the policy implemented here is to show only the first warning,
134 * unless trace_level >= 3.
136 if (err->num_warnings == 0 || err->trace_level >= 3)
137 (*err->output_message) (cinfo);
138 /* Always count warnings in num_warnings. */
141 /* It's a trace message. Show it if trace_level >= msg_level. */
142 if (err->trace_level >= msg_level)
143 (*err->output_message) (cinfo);
149 * Format a message string for the most recent JPEG error or message.
150 * The message is stored into buffer, which should be at least JMSG_LENGTH_MAX
151 * characters. Note that no '\n' character is added to the string.
152 * Few applications should need to override this method.
156 format_message (j_common_ptr cinfo, char * buffer)
158 struct jpeg_error_mgr * err = cinfo->err;
159 int msg_code = err->msg_code;
160 const char * msgtext = NULL;
165 /* Look up message string in proper table */
166 if (msg_code > 0 && msg_code <= err->last_jpeg_message) {
167 msgtext = err->jpeg_message_table[msg_code];
168 } else if (err->addon_message_table != NULL &&
169 msg_code >= err->first_addon_message &&
170 msg_code <= err->last_addon_message) {
171 msgtext = err->addon_message_table[msg_code - err->first_addon_message];
174 /* Defend against bogus message number */
175 if (msgtext == NULL) {
176 err->msg_parm.i[0] = msg_code;
177 msgtext = err->jpeg_message_table[0];
180 /* Check for string parameter, as indicated by %s in the message text */
183 while ((ch = *msgptr++) != '\0') {
185 if (*msgptr == 's') isstring = TRUE;
190 /* Format the message into the passed buffer */
192 sprintf(buffer, msgtext, err->msg_parm.s);
194 sprintf(buffer, msgtext,
195 err->msg_parm.i[0], err->msg_parm.i[1],
196 err->msg_parm.i[2], err->msg_parm.i[3],
197 err->msg_parm.i[4], err->msg_parm.i[5],
198 err->msg_parm.i[6], err->msg_parm.i[7]);
203 * Reset error state variables at start of a new image.
204 * This is called during compression startup to reset trace/error
205 * processing to default state, without losing any application-specific
206 * method pointers. An application might possibly want to override
207 * this method if it has additional error processing state.
211 reset_error_mgr (j_common_ptr cinfo)
213 cinfo->err->num_warnings = 0;
214 /* trace_level is not reset since it is an application-supplied parameter */
215 cinfo->err->msg_code = 0; /* may be useful as a flag for "no error" */
220 * Fill in the standard error-handling methods in a jpeg_error_mgr object.
222 * struct jpeg_compress_struct cinfo;
223 * struct jpeg_error_mgr err;
225 * cinfo.err = jpeg_std_error(&err);
226 * after which the application may override some of the methods.
229 GLOBAL(struct jpeg_error_mgr *)
230 jpeg_std_error (struct jpeg_error_mgr * err)
232 err->error_exit = error_exit;
233 err->emit_message = emit_message;
234 err->output_message = output_message;
235 err->format_message = format_message;
236 err->reset_error_mgr = reset_error_mgr;
238 err->trace_level = 0; /* default = no tracing */
239 err->num_warnings = 0; /* no warnings emitted yet */
240 err->msg_code = 0; /* may be useful as a flag for "no error" */
242 /* Initialize message table pointers */
243 err->jpeg_message_table = jpeg_std_message_table;
244 err->last_jpeg_message = (int) JMSG_LASTMSGCODE - 1;
246 err->addon_message_table = NULL;
247 err->first_addon_message = 0; /* for safety */
248 err->last_addon_message = 0;