jerror.c

MCB2300_ucgui_LCD320240.rar LPC2368的uc/gui的移植

/*
 * 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.
 */


#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 */
	/* RS 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;
}