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jerror.cpp
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2000-05-16
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//-------------------------------------------------------------------------//
// Windows Graphics Programming: Win32 GDI and DirectDraw //
// ISBN 0-13-086985-6 //
// //
// Modified by: Yuan, Feng www.fengyuan.com //
// Changes : C++, exception, in-memory source, BGR byte order //
// Version : 1.00.000, May 31, 2000 //
//-------------------------------------------------------------------------//
/*
* 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.
*/
jpeg_error_mgr::~jpeg_error_mgr()
{
}
void jpeg_error_mgr::error_exit(j_common_ptr cinfo)
{
/* Always display the message */
output_message();
/* Let the memory manager delete any temp files before we die */
// cinfo->jpeg_destroy();
throw msg_code; // C++ exception
}
/*
* 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.
*/
void jpeg_error_mgr::output_message(void)
{
char buffer[JMSG_LENGTH_MAX];
// Create the message
format_message(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.
*/
void jpeg_error_mgr::emit_message(int msg_level)
{
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 (num_warnings == 0 || trace_level >= 3)
output_message();
/* Always count warnings in num_warnings. */
num_warnings++;
}
else
{
/* It's a trace message. Show it if trace_level >= msg_level. */
if (trace_level >= msg_level)
output_message();
}
}
/*
* 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.
*/
void jpeg_error_mgr::format_message (char * buffer)
{
const char * msgtext = NULL;
const char * msgptr;
char ch;
boolean isstring;
/* Look up message string in proper table */
if (msg_code > 0 && msg_code <= last_jpeg_message) {
msgtext = jpeg_message_table[msg_code];
}
else if (addon_message_table != NULL &&
msg_code >= first_addon_message &&
msg_code <= last_addon_message)
{
msgtext = addon_message_table[msg_code - first_addon_message];
}
/* Defend against bogus message number */
if (msgtext == NULL)
{
msg_parm.i[0] = msg_code;
msgtext = 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, msg_parm.s);
else
sprintf(buffer, msgtext,
msg_parm.i[0], msg_parm.i[1],
msg_parm.i[2], msg_parm.i[3],
msg_parm.i[4], msg_parm.i[5],
msg_parm.i[6], 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.
*/
void jpeg_error_mgr::reset_error_mgr(void)
{
num_warnings = 0;
/* trace_level is not reset since it is an application-supplied parameter */
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.
*/
// constructor
jpeg_error_mgr::jpeg_error_mgr(void)
{
trace_level = 0; /* default = no tracing */
num_warnings = 0; /* no warnings emitted yet */
msg_code = 0; /* may be useful as a flag for "no error" */
/* Initialize message table pointers */
jpeg_message_table = jpeg_std_message_table;
last_jpeg_message = (int) JMSG_LASTMSGCODE - 1;
addon_message_table = NULL;
first_addon_message = 0; /* for safety */
last_addon_message = 0;
}
void jpeg_common_struct::ERREXIT(int code)
{
err->msg_code = code;
err->error_exit(this);
}
void jpeg_common_struct::ERREXIT1(int code, int p1)
{
err->msg_code = code;
err->msg_parm.i[0] = p1;
err->error_exit(this);
}
void jpeg_common_struct::ERREXIT2(int code, int p1, int p2)
{
err->msg_code = code;
err->msg_parm.i[0] = p1;
err->msg_parm.i[1] = p2;
err->error_exit(this);
}
void jpeg_common_struct::ERREXIT3(int code, int p1, int p2, int p3)
{
err->msg_code = code;
err->msg_parm.i[0] = p1;
err->msg_parm.i[1] = p2;
err->msg_parm.i[2] = p3;
err->error_exit(this);
}
void jpeg_common_struct::ERREXIT4(int code, int p1, int p2, int p3, int p4)
{
err->msg_code = code;
err->msg_parm.i[0] = p1;
err->msg_parm.i[1] = p2;
err->msg_parm.i[2] = p3;
err->msg_parm.i[3] = p4;
err->error_exit(this);
}
void jpeg_common_struct::ERREXITS(int code, const char * msg)
{
err->msg_code = code;
strncpy(err->msg_parm.s, msg, JMSG_STR_PARM_MAX);
err->error_exit(this);
}
void jpeg_common_struct::WARNMS(int code)
{
err->msg_code = code;
err->emit_message(-1);
}
void jpeg_common_struct::WARNMS1(int code, int p1)
{
err->msg_code = code;
err->msg_parm.i[0] = p1;
err->emit_message(-1);
}
void jpeg_common_struct::WARNMS2(int code, int p1, int p2)
{
err->msg_code = code;
err->msg_parm.i[0] = p1;
err->msg_parm.i[1] = p2;
err->emit_message(-1);
}