/*
 * jerror.c
 *
 * This file was part of the Independent JPEG Group's software:
 * Copyright (C) 1991-1998, Thomas G. Lane.
 * It was modified by The libjpeg-turbo Project to include only code relevant
 * to libjpeg-turbo.
 * For conditions of distribution and use, see the accompanying README.ijg
 * 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 */
	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;
}
