media/libjpeg/jerror.c

   1 /*
   2  * jerror.c
   3  *
   4  * This file was part of the Independent JPEG Group's software:
   5  * Copyright (C) 1991-1998, Thomas G. Lane.
   6  * libjpeg-turbo Modifications:
   7  * Copyright (C) 2022, D. R. Commander.
   8  * For conditions of distribution and use, see the accompanying README.ijg
   9  * file.
  10  *
  11  * This file contains simple error-reporting and trace-message routines.
  12  * These are suitable for Unix-like systems and others where writing to
  13  * stderr is the right thing to do.  Many applications will want to replace
  14  * some or all of these routines.
  15  *
  16  * If you define USE_WINDOWS_MESSAGEBOX in jconfig.h or in the makefile,
  17  * you get a Windows-specific hack to display error messages in a dialog box.
  18  * It ain't much, but it beats dropping error messages into the bit bucket,
  19  * which is what happens to output to stderr under most Windows C compilers.
  20  *
  21  * These routines are used by both the compression and decompression code.
  22  */
  23
  24 /* this is not a core library module, so it doesn't define JPEG_INTERNALS */
  25 #include "jinclude.h"
  26 #include "jpeglib.h"
  27 #include "jversion.h"
  28 #include "jerror.h"
  29
  30 #ifdef USE_WINDOWS_MESSAGEBOX
  31 #include <windows.h>
  32 #endif
  33
  34 #ifndef EXIT_FAILURE            /* define exit() codes if not provided */
  35 #define EXIT_FAILURE  1
  36 #endif
  37
  38
  39 /*
  40  * Create the message string table.
  41  * We do this from the master message list in jerror.h by re-reading
  42  * jerror.h with a suitable definition for macro JMESSAGE.
  43  * The message table is made an external symbol just in case any applications
  44  * want to refer to it directly.
  45  */
  46
  47 #define JMESSAGE(code, string)  string,
  48
  49 const char * const jpeg_std_message_table[] = {
  50 #include "jerror.h"
  51   NULL
  52 };
  53
  54
  55 /*
  56  * Error exit handler: must not return to caller.
  57  *
  58  * Applications may override this if they want to get control back after
  59  * an error.  Typically one would longjmp somewhere instead of exiting.
  60  * The setjmp buffer can be made a private field within an expanded error
  61  * handler object.  Note that the info needed to generate an error message
  62  * is stored in the error object, so you can generate the message now or
  63  * later, at your convenience.
  64  * You should make sure that the JPEG object is cleaned up (with jpeg_abort
  65  * or jpeg_destroy) at some point.
  66  */
  67
  68 METHODDEF(void)
  69 error_exit(j_common_ptr cinfo)
  70 {
  71   /* Always display the message */
  72   (*cinfo->err->output_message) (cinfo);
  73
  74   /* Let the memory manager delete any temp files before we die */
  75   jpeg_destroy(cinfo);
  76
  77   exit(EXIT_FAILURE);
  78 }
  79
  80
  81 /*
  82  * Actual output of an error or trace message.
  83  * Applications may override this method to send JPEG messages somewhere
  84  * other than stderr.
  85  *
  86  * On Windows, printing to stderr is generally completely useless,
  87  * so we provide optional code to produce an error-dialog popup.
  88  * Most Windows applications will still prefer to override this routine,
  89  * but if they don't, it'll do something at least marginally useful.
  90  *
  91  * NOTE: to use the library in an environment that doesn't support the
  92  * C stdio library, you may have to delete the call to fprintf() entirely,
  93  * not just not use this routine.
  94  */
  95
  96 METHODDEF(void)
  97 output_message(j_common_ptr cinfo)
  98 {
  99   char buffer[JMSG_LENGTH_MAX];
 100
 101   /* Create the message */
 102   (*cinfo->err->format_message) (cinfo, buffer);
 103
 104 #ifdef USE_WINDOWS_MESSAGEBOX
 105   /* Display it in a message dialog box */
 106   MessageBox(GetActiveWindow(), buffer, "JPEG Library Error",
 107              MB_OK | MB_ICONERROR);
 108 #else
 109   /* Send it to stderr, adding a newline */
 110   fprintf(stderr, "%s\n", buffer);
 111 #endif
 112 }
 113
 114
 115 /*
 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.
 124  */
 125
 126 METHODDEF(void)
 127 emit_message(j_common_ptr cinfo, int msg_level)
 128 {
 129   struct jpeg_error_mgr *err = cinfo->err;
 130
 131   if (msg_level < 0) {
 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.
 135      */
 136     if (err->num_warnings == 0 || err->trace_level >= 3)
 137       (*err->output_message) (cinfo);
 138     /* Always count warnings in num_warnings. */
 139     err->num_warnings++;
 140   } else {
 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);
 144   }
 145 }
 146
 147
 148 /*
 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.
 153  */
 154
 155 METHODDEF(void)
 156 format_message(j_common_ptr cinfo, char *buffer)
 157 {
 158   struct jpeg_error_mgr *err = cinfo->err;
 159   int msg_code = err->msg_code;
 160   const char *msgtext = NULL;
 161   const char *msgptr;
 162   char ch;
 163   boolean isstring;
 164
 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];
 172   }
 173
 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];
 178   }
 179
 180   /* Check for string parameter, as indicated by %s in the message text */
 181   isstring = FALSE;
 182   msgptr = msgtext;
 183   while ((ch = *msgptr++) != '\0') {
 184     if (ch == '%') {
 185       if (*msgptr == 's') isstring = TRUE;
 186       break;
 187     }
 188   }
 189
 190   /* Format the message into the passed buffer */
 191   if (isstring)
 192     SNPRINTF(buffer, JMSG_LENGTH_MAX, msgtext, err->msg_parm.s);
 193   else
 194     SNPRINTF(buffer, JMSG_LENGTH_MAX, 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]);
 199 }
 200
 201
 202 /*
 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.
 208  */
 209
 210 METHODDEF(void)
 211 reset_error_mgr(j_common_ptr cinfo)
 212 {
 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" */
 216 }
 217
 218
 219 /*
 220  * Fill in the standard error-handling methods in a jpeg_error_mgr object.
 221  * Typical call is:
 222  *      struct jpeg_compress_struct cinfo;
 223  *      struct jpeg_error_mgr err;
 224  *
 225  *      cinfo.err = jpeg_std_error(&err);
 226  * after which the application may override some of the methods.
 227  */
 228
 229 GLOBAL(struct jpeg_error_mgr *)
 230 jpeg_std_error(struct jpeg_error_mgr *err)
 231 {
 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;
 237
 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" */
 241
 242   /* Initialize message table pointers */
 243   err->jpeg_message_table = jpeg_std_message_table;
 244   err->last_jpeg_message = (int)JMSG_LASTMSGCODE - 1;
 245
 246   err->addon_message_table = NULL;
 247   err->first_addon_message = 0; /* for safety */
 248   err->last_addon_message = 0;
 249
 250   return err;
 251 }