pngerror.c
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1 
2 /* pngerror.c - stub functions for i/o and memory allocation
3  *
4  * Last changed in libpng 1.2.30 [August 15, 2008]
5  * For conditions of distribution and use, see copyright notice in png.h
6  * Copyright (c) 1998-2008 Glenn Randers-Pehrson
7  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
8  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
9  *
10  * This file provides a location for all error handling. Users who
11  * need special error handling are expected to write replacement functions
12  * and use png_set_error_fn() to use those functions. See the instructions
13  * at each function.
14  */
15 
16 #define PNG_INTERNAL
17 #include "png.h"
18 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
19 
20 static void /* PRIVATE */
23 #ifndef PNG_NO_WARNINGS
24 static void /* PRIVATE */
27 #endif /* PNG_NO_WARNINGS */
28 
29 /* This function is called whenever there is a fatal error. This function
30  * should not be changed. If there is a need to handle errors differently,
31  * you should supply a replacement error function and use png_set_error_fn()
32  * to replace the error function at run-time.
33  */
34 #ifndef PNG_NO_ERROR_TEXT
35 void PNGAPI
37 {
38 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
39  char msg[16];
40  if (png_ptr != NULL)
41  {
42  if (png_ptr->flags&
43  (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
44  {
45  if (*error_message == '#')
46  {
47  /* Strip "#nnnn " from beginning of error message. */
48  int offset;
49  for (offset = 1; offset<15; offset++)
50  if (error_message[offset] == ' ')
51  break;
52  if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
53  {
54  int i;
55  for (i = 0; i < offset - 1; i++)
56  msg[i] = error_message[i + 1];
57  msg[i - 1] = '\0';
58  error_message = msg;
59  }
60  else
61  error_message += offset;
62  }
63  else
64  {
65  if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
66  {
67  msg[0] = '0';
68  msg[1] = '\0';
69  error_message = msg;
70  }
71  }
72  }
73  }
74 #endif
75  if (png_ptr != NULL && png_ptr->error_fn != NULL)
76  (*(png_ptr->error_fn))(png_ptr, error_message);
77 
78  /* If the custom handler doesn't exist, or if it returns,
79  use the default handler, which will not return. */
81 }
82 #else
83 void PNGAPI
84 png_err(png_structp png_ptr)
85 {
86  if (png_ptr != NULL && png_ptr->error_fn != NULL)
87  (*(png_ptr->error_fn))(png_ptr, '\0');
88 
89  /* If the custom handler doesn't exist, or if it returns,
90  use the default handler, which will not return. */
91  png_default_error(png_ptr, '\0');
92 }
93 #endif /* PNG_NO_ERROR_TEXT */
94 
95 #ifndef PNG_NO_WARNINGS
96 /* This function is called whenever there is a non-fatal error. This function
97  * should not be changed. If there is a need to handle warnings differently,
98  * you should supply a replacement warning function and use
99  * png_set_error_fn() to replace the warning function at run-time.
100  */
101 void PNGAPI
103 {
104  int offset = 0;
105  if (png_ptr != NULL)
106  {
107 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
108  if (png_ptr->flags&
109  (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
110 #endif
111  {
112  if (*warning_message == '#')
113  {
114  for (offset = 1; offset < 15; offset++)
115  if (warning_message[offset] == ' ')
116  break;
117  }
118  }
119  if (png_ptr != NULL && png_ptr->warning_fn != NULL)
120  (*(png_ptr->warning_fn))(png_ptr, warning_message + offset);
121  }
122  else
123  png_default_warning(png_ptr, warning_message + offset);
124 }
125 #endif /* PNG_NO_WARNINGS */
126 
127 
128 /* These utilities are used internally to build an error message that relates
129  * to the current chunk. The chunk name comes from png_ptr->chunk_name,
130  * this is used to prefix the message. The message is limited in length
131  * to 63 bytes, the name characters are output as hex digits wrapped in []
132  * if the character is invalid.
133  */
134 #define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
135 static PNG_CONST char png_digit[16] = {
136  '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
137  'A', 'B', 'C', 'D', 'E', 'F'
138 };
139 
140 #define PNG_MAX_ERROR_TEXT 64
141 
142 #if !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT)
143 static void /* PRIVATE */
146 {
147  int iout = 0, iin = 0;
148 
149  while (iin < 4)
150  {
151  int c = png_ptr->chunk_name[iin++];
152  if (isnonalpha(c))
153  {
154  buffer[iout++] = '[';
155  buffer[iout++] = png_digit[(c & 0xf0) >> 4];
156  buffer[iout++] = png_digit[c & 0x0f];
157  buffer[iout++] = ']';
158  }
159  else
160  {
161  buffer[iout++] = (png_byte)c;
162  }
163  }
164 
165  if (error_message == NULL)
166  buffer[iout] = '\0';
167  else
168  {
169  buffer[iout++] = ':';
170  buffer[iout++] = ' ';
172  buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0';
173  }
174 }
175 
176 #ifdef PNG_READ_SUPPORTED
177 void PNGAPI
179 {
180  char msg[18+PNG_MAX_ERROR_TEXT];
181  if (png_ptr == NULL)
182  png_error(png_ptr, error_message);
183  else
184  {
185  png_format_buffer(png_ptr, msg, error_message);
186  png_error(png_ptr, msg);
187  }
188 }
189 #endif /* PNG_READ_SUPPORTED */
190 #endif /* !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT) */
191 
192 #ifndef PNG_NO_WARNINGS
193 void PNGAPI
195 {
196  char msg[18+PNG_MAX_ERROR_TEXT];
197  if (png_ptr == NULL)
198  png_warning(png_ptr, warning_message);
199  else
200  {
201  png_format_buffer(png_ptr, msg, warning_message);
202  png_warning(png_ptr, msg);
203  }
204 }
205 #endif /* PNG_NO_WARNINGS */
206 
207 
208 /* This is the default error handling function. Note that replacements for
209  * this function MUST NOT RETURN, or the program will likely crash. This
210  * function is used by default, or if the program supplies NULL for the
211  * error function pointer in png_set_error_fn().
212  */
213 static void /* PRIVATE */
215 {
216 #ifndef PNG_NO_CONSOLE_IO
217 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
218  if (*error_message == '#')
219  {
220  /* Strip "#nnnn " from beginning of warning message. */
221  int offset;
222  char error_number[16];
223  for (offset = 0; offset<15; offset++)
224  {
225  error_number[offset] = error_message[offset + 1];
226  if (error_message[offset] == ' ')
227  break;
228  }
229  if ((offset > 1) && (offset < 15))
230  {
231  error_number[offset - 1] = '\0';
232  fprintf(stderr, "libpng error no. %s: %s\n", error_number,
233  error_message + offset + 1);
234  }
235  else
236  fprintf(stderr, "libpng error: %s, offset=%d\n", error_message, offset);
237  }
238  else
239 #endif
240  fprintf(stderr, "libpng error: %s\n", error_message);
241 #endif
242 
243 #ifdef PNG_SETJMP_SUPPORTED
244  if (png_ptr)
245  {
246 # ifdef USE_FAR_KEYWORD
247  {
248  jmp_buf jmpbuf;
249  png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
250  longjmp(jmpbuf, 1);
251  }
252 # else
253  longjmp(png_ptr->jmpbuf, 1);
254 # endif
255  }
256 #else
257  PNG_ABORT();
258 #endif
259 #ifdef PNG_NO_CONSOLE_IO
260  error_message = error_message; /* make compiler happy */
261 #endif
262 }
263 
264 #ifndef PNG_NO_WARNINGS
265 /* This function is called when there is a warning, but the library thinks
266  * it can continue anyway. Replacement functions don't have to do anything
267  * here if you don't want them to. In the default configuration, png_ptr is
268  * not used, but it is passed in case it may be useful.
269  */
270 static void /* PRIVATE */
272 {
273 #ifndef PNG_NO_CONSOLE_IO
274 # ifdef PNG_ERROR_NUMBERS_SUPPORTED
275  if (*warning_message == '#')
276  {
277  int offset;
278  char warning_number[16];
279  for (offset = 0; offset < 15; offset++)
280  {
281  warning_number[offset] = warning_message[offset + 1];
282  if (warning_message[offset] == ' ')
283  break;
284  }
285  if ((offset > 1) && (offset < 15))
286  {
287  warning_number[offset + 1] = '\0';
288  fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
289  warning_message + offset);
290  }
291  else
292  fprintf(stderr, "libpng warning: %s\n", warning_message);
293  }
294  else
295 # endif
296  fprintf(stderr, "libpng warning: %s\n", warning_message);
297 #else
298  warning_message = warning_message; /* make compiler happy */
299 #endif
300  png_ptr = png_ptr; /* make compiler happy */
301 }
302 #endif /* PNG_NO_WARNINGS */
303 
304 /* This function is called when the application wants to use another method
305  * of handling errors and warnings. Note that the error function MUST NOT
306  * return to the calling routine or serious problems will occur. The return
307  * method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
308  */
309 void PNGAPI
311  png_error_ptr error_fn, png_error_ptr warning_fn)
312 {
313  if (png_ptr == NULL)
314  return;
315  png_ptr->error_ptr = error_ptr;
316  png_ptr->error_fn = error_fn;
317  png_ptr->warning_fn = warning_fn;
318 }
319 
320 
321 /* This function returns a pointer to the error_ptr associated with the user
322  * functions. The application should free any memory associated with this
323  * pointer before png_write_destroy and png_read_destroy are called.
324  */
327 {
328  if (png_ptr == NULL)
329  return NULL;
330  return ((png_voidp)png_ptr->error_ptr);
331 }
332 
333 
334 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
335 void PNGAPI
337 {
338  if (png_ptr != NULL)
339  {
340  png_ptr->flags &=
341  ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
342  }
343 }
344 #endif
345 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
png_sizeof
#define png_sizeof(x)
Definition: pngconf.h:1127
warning_message
png_const_charp warning_message
Definition: png.h:2133
i
png_uint_32 i
Definition: png.h:2732
png_set_strip_error_numbers
void PNGAPI png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
Definition: pngerror.c:336
png_default_warning
static void png_default_warning(png_structp png_ptr, png_const_charp warning_message)
Definition: pngerror.c:271
png_set_error_fn
void PNGAPI png_set_error_fn(png_structp png_ptr, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)
Definition: pngerror.c:310
png_charp
char FAR * png_charp
Definition: pngconf.h:1201
buffer
png_infop png_bytep buffer
Definition: png.h:2039
isnonalpha
#define isnonalpha(c)
Definition: pngerror.c:134
png_format_buffer
static void png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp error_message)
Definition: pngerror.c:144
png_const_charp
PNG_CONST char FAR * png_const_charp
Definition: pngconf.h:1200
png_chunk_error
void PNGAPI png_chunk_error(png_structp png_ptr, png_const_charp error_message)
Definition: pngerror.c:178
PNG_CONST
#define PNG_CONST
Definition: pngconf.h:445
PNGAPI
#define PNGAPI
Definition: pngconf.h:1384
png_byte
unsigned char png_byte
Definition: pngconf.h:1118
PNG_MAX_ERROR_TEXT
#define PNG_MAX_ERROR_TEXT
Definition: pngerror.c:140
png_warning
void PNGAPI png_warning(png_structp png_ptr, png_const_charp warning_message)
Definition: pngerror.c:102
error_message
png_const_charp error_message
Definition: png.h:2120
png_memcpy
#define png_memcpy
Definition: pngconf.h:1463
png_structp
png_struct FAR * png_structp
Definition: png.h:1105
png_digit
static PNG_CONST char png_digit[16]
Definition: pngerror.c:135
error_ptr
png_voidp error_ptr
Definition: png.h:1503
png_get_error_ptr
png_voidp PNGAPI png_get_error_ptr(png_structp png_ptr)
Definition: pngerror.c:326
warning_fn
png_voidp png_error_ptr png_error_ptr warning_fn
Definition: png.h:1960
error_fn
png_voidp png_error_ptr error_fn
Definition: png.h:1504
autoplay.c
int c
Definition: autoplay.py:16
png_uint_32
unsigned long png_uint_32
Definition: pngconf.h:1114
png_voidp
void FAR * png_voidp
Definition: pngconf.h:1194
PNG_ABORT
#define PNG_ABORT()
Definition: pngconf.h:1416
strip_mode
png_uint_32 strip_mode
Definition: png.h:2649
PNGARG
static void png_default_error PNGARG((png_structp png_ptr, png_const_charp error_message))
png.h
png_default_error
static void png_default_error(png_structp png_ptr, png_const_charp error_message)
Definition: pngerror.c:214
png_error
void PNGAPI png_error(png_structp png_ptr, png_const_charp error_message)
Definition: pngerror.c:36
png_chunk_warning
void PNGAPI png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
Definition: pngerror.c:194


openhrp3
Author(s): AIST, General Robotix Inc., Nakamura Lab of Dept. of Mechano Informatics at University of Tokyo
autogenerated on Wed Sep 7 2022 02:51:04