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 /*

  * jerror.c

  *

  * Copyright (C) 1991-1998, Thomas G. Lane.

  * This file is part of the Independent JPEG Group's software.

  * For conditions of distribution and use, see the accompanying README file.

  *

  * This file contains simple error-reporting and trace-message routines.

  * These are suitable for Unix-like systems and others where writing to

  * stderr is the right thing to do.  Many applications will want to replace

  * some or all of these routines.

  *

  * If you define USE_WINDOWS_MESSAGEBOX in jconfig.h or in the makefile,

  * you get a Windows-specific hack to display error messages in a dialog box.

  * It ain't much, but it beats dropping error messages into the bit bucket,

  * which is what happens to output to stderr under most Windows C compilers.

  *

  * These routines are used by both the compression and decompression code.

  */

 /* this is not a core library module, so it doesn't define JPEG_INTERNALS */

 #include "jinclude.h"

 #include "jpeglib.h"

 #include "jversion.h"

 #include "jerror.h"

 #ifdef USE_WINDOWS_MESSAGEBOX

 #include <windows.h>

 #endif

 #ifndef EXIT_FAILURE		/* define exit() codes if not provided */

 #define EXIT_FAILURE  1

 #endif

 /*

  * Create the message string table.

  * We do this from the master message list in jerror.h by re-reading

  * jerror.h with a suitable definition for macro JMESSAGE.

  * The message table is made an external symbol just in case any applications

  * want to refer to it directly.

  */

 #ifdef NEED_SHORT_EXTERNAL_NAMES

 #define jpeg_std_message_table	jMsgTable

 #endif

 #define JMESSAGE(code,string)	string ,

 const char * const jpeg_std_message_table[] = {

 #include "jerror.h"

   NULL

 };

 /*

  * Error exit handler: must not return to caller.

  *

  * Applications may override this if they want to get control back after

  * an error.  Typically one would longjmp somewhere instead of exiting.

  * The setjmp buffer can be made a private field within an expanded error

  * handler object.  Note that the info needed to generate an error message

  * is stored in the error object, so you can generate the message now or

  * later, at your convenience.

  * You should make sure that the JPEG object is cleaned up (with jpeg_abort

  * or jpeg_destroy) at some point.

  */

 METHODDEF(void)

 error_exit (j_common_ptr cinfo)

 {

   /* Always display the message */

   (*cinfo->err->output_message) (cinfo);

   /* Let the memory manager delete any temp files before we die */

   jpeg_destroy(cinfo);

   exit(EXIT_FAILURE);

 }

 /*

  * Actual output of an error or trace message.

  * Applications may override this method to send JPEG messages somewhere

  * other than stderr.

  *

  * On Windows, printing to stderr is generally completely useless,

  * so we provide optional code to produce an error-dialog popup.

  * Most Windows applications will still prefer to override this routine,

  * but if they don't, it'll do something at least marginally useful.

  *

  * NOTE: to use the library in an environment that doesn't support the

  * C stdio library, you may have to delete the call to fprintf() entirely,

  * not just not use this routine.

  */

 METHODDEF(void)

 output_message (j_common_ptr cinfo)

 {

   char buffer[JMSG_LENGTH_MAX];

   /* Create the message */

   (*cinfo->err->format_message) (cinfo, buffer);

 #ifdef USE_WINDOWS_MESSAGEBOX

   /* Display it in a message dialog box */

   MessageBox(GetActiveWindow(), buffer, "JPEG Library Error",

 	     MB_OK | MB_ICONERROR);

 #else

   /* Send it to stderr, adding a newline */

   fprintf(stderr, "%s\n", buffer);

 #endif

 }

 /*

  * Decide whether to emit a trace or warning message.

  * msg_level is one of:

  *   -1: recoverable corrupt-data warning, may want to abort.

  *    0: important advisory messages (always display to user).

  *    1: first level of tracing detail.

  *    2,3,...: successively more detailed tracing messages.

  * An application might override this method if it wanted to abort on warnings

  * or change the policy about which messages to display.

  */

 METHODDEF(void)

 emit_message (j_common_ptr cinfo, int msg_level)

 {

   struct jpeg_error_mgr * err = cinfo->err;

   if (msg_level < 0) {

     /* It's a warning message.  Since corrupt files may generate many warnings,

      * the policy implemented here is to show only the first warning,

      * unless trace_level >= 3.

      */

     if (err->num_warnings == 0 || err->trace_level >= 3)

       (*err->output_message) (cinfo);

     /* Always count warnings in num_warnings. */

     err->num_warnings++;

   } else {

     /* It's a trace message.  Show it if trace_level >= msg_level. */

     if (err->trace_level >= msg_level)

       (*err->output_message) (cinfo);

   }

 }

 /*

  * Format a message string for the most recent JPEG error or message.

  * The message is stored into buffer, which should be at least JMSG_LENGTH_MAX

  * characters.  Note that no '\n' character is added to the string.

  * Few applications should need to override this method.

  */

 METHODDEF(void)

 format_message (j_common_ptr cinfo, char * buffer)

 {

   struct jpeg_error_mgr * err = cinfo->err;

   int msg_code = err->msg_code;

   const char * msgtext = NULL;

   const char * msgptr;

   char ch;

   boolean isstring;

   /* Look up message string in proper table */

   if (msg_code > 0 && msg_code <= err->last_jpeg_message) {

     msgtext = err->jpeg_message_table[msg_code];

   } else if (err->addon_message_table != NULL &&

 	     msg_code >= err->first_addon_message &&

 	     msg_code <= err->last_addon_message) {

     msgtext = err->addon_message_table[msg_code - err->first_addon_message];

   }

   /* Defend against bogus message number */

   if (msgtext == NULL) {

     err->msg_parm.i[0] = msg_code;

     msgtext = err->jpeg_message_table[0];

   }

   /* Check for string parameter, as indicated by %s in the message text */

   isstring = FALSE;

   msgptr = msgtext;

   while ((ch = *msgptr++) != '\0') {

     if (ch == '%') {

       if (*msgptr == 's') isstring = TRUE;

       break;

     }

   }

   /* Format the message into the passed buffer */

   if (isstring)

     sprintf(buffer, msgtext, err->msg_parm.s);

   else

     sprintf(buffer, msgtext,

 	    err->msg_parm.i[0], err->msg_parm.i[1],

 	    err->msg_parm.i[2], err->msg_parm.i[3],

 	    err->msg_parm.i[4], err->msg_parm.i[5],

 	    err->msg_parm.i[6], err->msg_parm.i[7]);

 }

 /*

  * Reset error state variables at start of a new image.

  * This is called during compression startup to reset trace/error

  * processing to default state, without losing any application-specific

  * method pointers.  An application might possibly want to override

  * this method if it has additional error processing state.

  */

 METHODDEF(void)

 reset_error_mgr (j_common_ptr cinfo)

 {

   cinfo->err->num_warnings = 0;

   /* trace_level is not reset since it is an application-supplied parameter */

   cinfo->err->msg_code = 0;	/* may be useful as a flag for "no error" */

 }

 /*

  * Fill in the standard error-handling methods in a jpeg_error_mgr object.

  * Typical call is:

  *	struct jpeg_compress_struct cinfo;

  *	struct jpeg_error_mgr err;

  *

  *	cinfo.err = jpeg_std_error(&err);

  * after which the application may override some of the methods.

  */

 GLOBAL(struct jpeg_error_mgr *)

 jpeg_std_error (struct jpeg_error_mgr * err)

 {

   err->error_exit = error_exit;

   err->emit_message = emit_message;

   err->output_message = output_message;

   err->format_message = format_message;

   err->reset_error_mgr = reset_error_mgr;

   err->trace_level = 0;		/* default = no tracing */

   err->num_warnings = 0;	/* no warnings emitted yet */

   err->msg_code = 0;		/* may be useful as a flag for "no error" */

   /* Initialize message table pointers */

   err->jpeg_message_table = jpeg_std_message_table;

   err->last_jpeg_message = (int) JMSG_LASTMSGCODE - 1;

   err->addon_message_table = NULL;

   err->first_addon_message = 0;	/* for safety */

   err->last_addon_message = 0;

   return err;

 }