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view libs/libpng/pngerror.c @ 17:aef7f51f6397
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| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Wed, 10 Jun 2015 06:56:27 +0300 |
| parents | |
| children |
line source
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 */
16 #define PNG_INTERNAL
17 #include "png.h"
18 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
20 static void /* PRIVATE */
21 png_default_error PNGARG((png_structp png_ptr,
22 png_const_charp error_message));
23 #ifndef PNG_NO_WARNINGS
24 static void /* PRIVATE */
25 png_default_warning PNGARG((png_structp png_ptr,
26 png_const_charp warning_message));
27 #endif /* PNG_NO_WARNINGS */
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
36 png_error(png_structp png_ptr, png_const_charp error_message)
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);
78 /* If the custom handler doesn't exist, or if it returns,
79 use the default handler, which will not return. */
80 png_default_error(png_ptr, error_message);
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');
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 */
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
102 png_warning(png_structp png_ptr, png_const_charp warning_message)
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 */
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 };
140 #define PNG_MAX_ERROR_TEXT 64
142 #if !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT)
143 static void /* PRIVATE */
144 png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
145 error_message)
146 {
147 int iout = 0, iin = 0;
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 }
165 if (error_message == NULL)
166 buffer[iout] = '\0';
167 else
168 {
169 buffer[iout++] = ':';
170 buffer[iout++] = ' ';
171 png_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT);
172 buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0';
173 }
174 }
176 #ifdef PNG_READ_SUPPORTED
177 void PNGAPI
178 png_chunk_error(png_structp png_ptr, png_const_charp error_message)
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) */
192 #ifndef PNG_NO_WARNINGS
193 void PNGAPI
194 png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
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 */
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 */
214 png_default_error(png_structp png_ptr, png_const_charp error_message)
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
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 }
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 */
271 png_default_warning(png_structp png_ptr, png_const_charp warning_message)
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 */
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
310 png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
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 }
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 */
325 png_voidp PNGAPI
326 png_get_error_ptr(png_structp png_ptr)
327 {
328 if (png_ptr == NULL)
329 return NULL;
330 return ((png_voidp)png_ptr->error_ptr);
331 }
334 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
335 void PNGAPI
336 png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
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 */