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1 | ||
2 | /* pngerror.c - stub functions for i/o and memory allocation | |
3 | * | |
4 | * Last changed in libpng 1.2.34 [December 18, 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 */ | |
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 */ | |
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 | |
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); | |
77 | ||
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'); | |
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 | |
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 | } | |
120 | if (png_ptr != NULL && png_ptr->warning_fn != NULL) | |
121 | (*(png_ptr->warning_fn))(png_ptr, warning_message + offset); | |
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 */ | |
144 | png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp | |
145 | error_message) | |
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++] = ' '; | |
171 | png_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT); | |
172 | buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0'; | |
173 | } | |
174 | } | |
175 | ||
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) */ | |
191 | ||
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 */ | |
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 */ | |
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 | |
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 */ | |
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 */ | |
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 | |
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 | } | |
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 | */ | |
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 | } | |
332 | ||
333 | ||
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 */ |