| /* |
| * 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; |
| } |