Jerror.c
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上传日期:2007-01-08
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- ////////////////////////////////////////////////////////////////////////
- //
- // Note : this file is included as part of the Smaller Animals Software
- // JpegFile package. Though this file has not been modified from it's
- // original IJG 6a form, it is not the responsibility on the Independent
- // JPEG Group to answer questions regarding this code.
- //
- // Any questions you have about this code should be addressed to :
- //
- // CHRISDL@PAGESZ.NET - the distributor of this package.
- //
- // Remember, by including this code in the JpegFile package, Smaller
- // Animals Software assumes all responsibilities for answering questions
- // about it. If we (SA Software) can't answer your questions ourselves, we
- // will direct you to people who can.
- //
- // Thanks, CDL.
- //
- ////////////////////////////////////////////////////////////////////////
- /*
- * jerror.c
- *
- * Copyright (C) 1991-1996, 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.
- *
- * 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 "windows.h"
- #include "jinclude.h"
- #define HAVE_BOOLEAN
- #include "jpeglib.h"
- #include "jversion.h"
- #include "jerror.h"
- #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);
- /* commented-out by chrisdl@netheaven.com, chrisdl@pagesz.net */
- //exit(EXIT_FAILURE);
- }
- /*
- * Actual output of an error or trace message.
- * Applications may override this method to send JPEG messages somewhere
- * other than stderr.
- */
- METHODDEF(void)
- output_message (j_common_ptr cinfo)
- {
- char buffer[JMSG_LENGTH_MAX];
- /* Create the message */
- (*cinfo->err->format_message) (cinfo, buffer);
- /* Send it to stderr, adding a newline */
- /* commented-out by chrisdl@netheaven.com, chrisdl@pagesz.net */
- //fprintf(stderr, "%sn", buffer);
- /*added by chrisdl@netheaven.com, chrisdl@pagesz.net */
- //MessageBox(GetActiveWindow(),buffer,"JPEG Error",MB_OK);
- // YZ 2000-11-15 注释掉了上面的一行
- }
- /*
- * 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++) != ' ') {
- 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;
- }