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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254/* * jerror.c * * Copyright (C) 1991-1998, Thomas G. Lane. * Modified 2012-2015 by Guido Vollbeding. * 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. */
#ifdef USE_WINDOWS_MESSAGEBOX#include <windows.h>#endif
/* 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"
#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(noreturn_t)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;}