Visualization Library 2.0.0-b5

A lightweight C++ OpenGL middleware for 2D/3D graphics

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jerror.c
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1 /*
2  * jerror.c
3  *
4  * Copyright (C) 1991-1998, Thomas G. Lane.
5  * This file is part of the Independent JPEG Group's software.
6  * For conditions of distribution and use, see the accompanying README file.
7  *
8  * This file contains simple error-reporting and trace-message routines.
9  * These are suitable for Unix-like systems and others where writing to
10  * stderr is the right thing to do. Many applications will want to replace
11  * some or all of these routines.
12  *
13  * If you define USE_WINDOWS_MESSAGEBOX in jconfig.h or in the makefile,
14  * you get a Windows-specific hack to display error messages in a dialog box.
15  * It ain't much, but it beats dropping error messages into the bit bucket,
16  * which is what happens to output to stderr under most Windows C compilers.
17  *
18  * These routines are used by both the compression and decompression code.
19  */
20 
21 /* this is not a core library module, so it doesn't define JPEG_INTERNALS */
22 #include "jinclude.h"
23 #include "jpeglib.h"
24 #include "jversion.h"
25 #include "jerror.h"
26 
27 #ifdef USE_WINDOWS_MESSAGEBOX
28 #include <windows.h>
29 #endif
30 
31 #ifndef EXIT_FAILURE /* define exit() codes if not provided */
32 #define EXIT_FAILURE 1
33 #endif
34 
35 
36 /*
37  * Create the message string table.
38  * We do this from the master message list in jerror.h by re-reading
39  * jerror.h with a suitable definition for macro JMESSAGE.
40  * The message table is made an external symbol just in case any applications
41  * want to refer to it directly.
42  */
43 
44 #ifdef NEED_SHORT_EXTERNAL_NAMES
45 #define jpeg_std_message_table jMsgTable
46 #endif
47 
48 #define JMESSAGE(code,string) string ,
49 
50 const char * const jpeg_std_message_table[] = {
51 #include "jerror.h"
52  NULL
53 };
54 
55 
56 /*
57  * Error exit handler: must not return to caller.
58  *
59  * Applications may override this if they want to get control back after
60  * an error. Typically one would longjmp somewhere instead of exiting.
61  * The setjmp buffer can be made a private field within an expanded error
62  * handler object. Note that the info needed to generate an error message
63  * is stored in the error object, so you can generate the message now or
64  * later, at your convenience.
65  * You should make sure that the JPEG object is cleaned up (with jpeg_abort
66  * or jpeg_destroy) at some point.
67  */
68 
69 METHODDEF(void)
71 {
72  /* Always display the message */
73  (*cinfo->err->output_message) (cinfo);
74 
75  /* Let the memory manager delete any temp files before we die */
76  jpeg_destroy(cinfo);
77 
78  exit(EXIT_FAILURE);
79 }
80 
81 
82 /*
83  * Actual output of an error or trace message.
84  * Applications may override this method to send JPEG messages somewhere
85  * other than stderr.
86  *
87  * On Windows, printing to stderr is generally completely useless,
88  * so we provide optional code to produce an error-dialog popup.
89  * Most Windows applications will still prefer to override this routine,
90  * but if they don't, it'll do something at least marginally useful.
91  *
92  * NOTE: to use the library in an environment that doesn't support the
93  * C stdio library, you may have to delete the call to fprintf() entirely,
94  * not just not use this routine.
95  */
96 
97 METHODDEF(void)
99 {
100  char buffer[JMSG_LENGTH_MAX];
101 
102  /* Create the message */
103  (*cinfo->err->format_message) (cinfo, buffer);
104 
105 #ifdef USE_WINDOWS_MESSAGEBOX
106  /* Display it in a message dialog box */
107  MessageBox(GetActiveWindow(), buffer, "JPEG Library Error",
108  MB_OK | MB_ICONERROR);
109 #else
110  /* Send it to stderr, adding a newline */
111  fprintf(stderr, "%s\n", buffer);
112 #endif
113 }
114 
115 
116 /*
117  * Decide whether to emit a trace or warning message.
118  * msg_level is one of:
119  * -1: recoverable corrupt-data warning, may want to abort.
120  * 0: important advisory messages (always display to user).
121  * 1: first level of tracing detail.
122  * 2,3,...: successively more detailed tracing messages.
123  * An application might override this method if it wanted to abort on warnings
124  * or change the policy about which messages to display.
125  */
126 
127 METHODDEF(void)
128 emit_message (j_common_ptr cinfo, int msg_level)
129 {
130  struct jpeg_error_mgr * err = cinfo->err;
131 
132  if (msg_level < 0) {
133  /* It's a warning message. Since corrupt files may generate many warnings,
134  * the policy implemented here is to show only the first warning,
135  * unless trace_level >= 3.
136  */
137  if (err->num_warnings == 0 || err->trace_level >= 3)
138  (*err->output_message) (cinfo);
139  /* Always count warnings in num_warnings. */
140  err->num_warnings++;
141  } else {
142  /* It's a trace message. Show it if trace_level >= msg_level. */
143  if (err->trace_level >= msg_level)
144  (*err->output_message) (cinfo);
145  }
146 }
147 
148 
149 /*
150  * Format a message string for the most recent JPEG error or message.
151  * The message is stored into buffer, which should be at least JMSG_LENGTH_MAX
152  * characters. Note that no '\n' character is added to the string.
153  * Few applications should need to override this method.
154  */
155 
156 METHODDEF(void)
158 {
159  struct jpeg_error_mgr * err = cinfo->err;
160  int msg_code = err->msg_code;
161  const char * msgtext = NULL;
162  const char * msgptr;
163  char ch;
164  boolean isstring;
165 
166  /* Look up message string in proper table */
167  if (msg_code > 0 && msg_code <= err->last_jpeg_message) {
168  msgtext = err->jpeg_message_table[msg_code];
169  } else if (err->addon_message_table != NULL &&
170  msg_code >= err->first_addon_message &&
171  msg_code <= err->last_addon_message) {
172  msgtext = err->addon_message_table[msg_code - err->first_addon_message];
173  }
174 
175  /* Defend against bogus message number */
176  if (msgtext == NULL) {
177  err->msg_parm.i[0] = msg_code;
178  msgtext = err->jpeg_message_table[0];
179  }
180 
181  /* Check for string parameter, as indicated by %s in the message text */
182  isstring = FALSE;
183  msgptr = msgtext;
184  while ((ch = *msgptr++) != '\0') {
185  if (ch == '%') {
186  if (*msgptr == 's') isstring = TRUE;
187  break;
188  }
189  }
190 
191  /* Format the message into the passed buffer */
192  if (isstring)
193  sprintf(buffer, msgtext, err->msg_parm.s);
194  else
195  sprintf(buffer, msgtext,
196  err->msg_parm.i[0], err->msg_parm.i[1],
197  err->msg_parm.i[2], err->msg_parm.i[3],
198  err->msg_parm.i[4], err->msg_parm.i[5],
199  err->msg_parm.i[6], err->msg_parm.i[7]);
200 }
201 
202 
203 /*
204  * Reset error state variables at start of a new image.
205  * This is called during compression startup to reset trace/error
206  * processing to default state, without losing any application-specific
207  * method pointers. An application might possibly want to override
208  * this method if it has additional error processing state.
209  */
210 
211 METHODDEF(void)
213 {
214  cinfo->err->num_warnings = 0;
215  /* trace_level is not reset since it is an application-supplied parameter */
216  cinfo->err->msg_code = 0; /* may be useful as a flag for "no error" */
217 }
218 
219 
220 /*
221  * Fill in the standard error-handling methods in a jpeg_error_mgr object.
222  * Typical call is:
223  * struct jpeg_compress_struct cinfo;
224  * struct jpeg_error_mgr err;
225  *
226  * cinfo.err = jpeg_std_error(&err);
227  * after which the application may override some of the methods.
228  */
229 
230 GLOBAL(struct jpeg_error_mgr *)
232 {
233  err->error_exit = error_exit;
234  err->emit_message = emit_message;
235  err->output_message = output_message;
236  err->format_message = format_message;
237  err->reset_error_mgr = reset_error_mgr;
238 
239  err->trace_level = 0; /* default = no tracing */
240  err->num_warnings = 0; /* no warnings emitted yet */
241  err->msg_code = 0; /* may be useful as a flag for "no error" */
242 
243  /* Initialize message table pointers */
245  err->last_jpeg_message = (int) JMSG_LASTMSGCODE - 1;
246 
247  err->addon_message_table = NULL;
248  err->first_addon_message = 0; /* for safety */
249  err->last_addon_message = 0;
250 
251  return err;
252 }
long num_warnings
Definition: jpeglib.h:676
int last_jpeg_message
Definition: jpeglib.h:689
int last_addon_message
Definition: jpeglib.h:695
error_exit(j_common_ptr cinfo)
Definition: jerror.c:70
#define NULL
Definition: ftobjs.h:61
char s[JMSG_STR_PARM_MAX]
Definition: jpeglib.h:663
const char *const * addon_message_table
Definition: jpeglib.h:693
output_message(j_common_ptr cinfo)
Definition: jerror.c:98
const char *const jpeg_std_message_table[]
Definition: jerror.c:50
emit_message(j_common_ptr cinfo, int msg_level)
Definition: jerror.c:128
int trace_level
Definition: jpeglib.h:668
#define JMSG_LENGTH_MAX
Definition: jpeglib.h:652
union jpeg_error_mgr::@35 msg_parm
int first_addon_message
Definition: jpeglib.h:694
GLuint buffer
#define EXIT_FAILURE
Definition: jerror.c:32
#define FALSE
Definition: ftobjs.h:57
int i[8]
Definition: jpeglib.h:662
format_message(j_common_ptr cinfo, char *buffer)
Definition: jerror.c:157
typedef int
Definition: png.h:978
#define GLOBAL(type)
Definition: jmorecfg.h:191
#define METHODDEF(type)
Definition: jmorecfg.h:187
const char *const * jpeg_message_table
Definition: jpeglib.h:688
reset_error_mgr(j_common_ptr cinfo)
Definition: jerror.c:212
jpeg_std_error(struct jpeg_error_mgr *err)
Definition: jerror.c:231
jpeg_destroy(j_common_ptr cinfo)
Definition: jcomapi.c:69
#define TRUE
Definition: ftobjs.h:53