| 1 | |
| 2 | /* pngerror.c - stub functions for i/o and memory allocation |
| 3 | * |
| 4 | * Last changed in libpng 1.5.7 [December 15, 2011] |
| 5 | * Copyright (c) 1998-2011 Glenn Randers-Pehrson |
| 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| 8 | * |
| 9 | * This code is released under the libpng license. |
| 10 | * For conditions of distribution and use, see the disclaimer |
| 11 | * and license in png.h |
| 12 | * |
| 13 | * This file provides a location for all error handling. Users who |
| 14 | * need special error handling are expected to write replacement functions |
| 15 | * and use png_set_error_fn() to use those functions. See the instructions |
| 16 | * at each function. |
| 17 | */ |
| 18 | |
| 19 | #include "pngpriv.h" |
| 20 | |
| 21 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| 22 | |
| 23 | static PNG_FUNCTION(void, png_default_error,PNGARG((png_structp png_ptr, |
| 24 | png_const_charp error_message)),PNG_NORETURN); |
| 25 | |
| 26 | #ifdef PNG_WARNINGS_SUPPORTED |
| 27 | static void /* PRIVATE */ |
| 28 | png_default_warning PNGARG((png_structp png_ptr, |
| 29 | png_const_charp warning_message)); |
| 30 | #endif /* PNG_WARNINGS_SUPPORTED */ |
| 31 | |
| 32 | /* This function is called whenever there is a fatal error. This function |
| 33 | * should not be changed. If there is a need to handle errors differently, |
| 34 | * you should supply a replacement error function and use png_set_error_fn() |
| 35 | * to replace the error function at run-time. |
| 36 | */ |
| 37 | #ifdef PNG_ERROR_TEXT_SUPPORTED |
| 38 | PNG_FUNCTION(void,PNGAPI |
| 39 | png_error,(png_structp png_ptr, png_const_charp error_message),PNG_NORETURN) |
| 40 | { |
| 41 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 42 | char msg[16]; |
| 43 | if (png_ptr != NULL) |
| 44 | { |
| 45 | if (png_ptr->flags& |
| 46 | (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) |
| 47 | { |
| 48 | if (*error_message == PNG_LITERAL_SHARP) |
| 49 | { |
| 50 | /* Strip "#nnnn " from beginning of error message. */ |
| 51 | int offset; |
| 52 | for (offset = 1; offset<15; offset++) |
| 53 | if (error_message[offset] == ' ') |
| 54 | break; |
| 55 | |
| 56 | if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) |
| 57 | { |
| 58 | int i; |
| 59 | for (i = 0; i < offset - 1; i++) |
| 60 | msg[i] = error_message[i + 1]; |
| 61 | msg[i - 1] = '\0'; |
| 62 | error_message = msg; |
| 63 | } |
| 64 | |
| 65 | else |
| 66 | error_message += offset; |
| 67 | } |
| 68 | |
| 69 | else |
| 70 | { |
| 71 | if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) |
| 72 | { |
| 73 | msg[0] = '0'; |
| 74 | msg[1] = '\0'; |
| 75 | error_message = msg; |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | } |
| 80 | #endif |
| 81 | if (png_ptr != NULL && png_ptr->error_fn != NULL) |
| 82 | (*(png_ptr->error_fn))(png_ptr, error_message); |
| 83 | |
| 84 | /* If the custom handler doesn't exist, or if it returns, |
| 85 | use the default handler, which will not return. */ |
| 86 | png_default_error(png_ptr, error_message); |
| 87 | } |
| 88 | #else |
| 89 | PNG_FUNCTION(void,PNGAPI |
| 90 | png_err,(png_structp png_ptr),PNG_NORETURN) |
| 91 | { |
| 92 | /* Prior to 1.5.2 the error_fn received a NULL pointer, expressed |
| 93 | * erroneously as '\0', instead of the empty string "". This was |
| 94 | * apparently an error, introduced in libpng-1.2.20, and png_default_error |
| 95 | * will crash in this case. |
| 96 | */ |
| 97 | if (png_ptr != NULL && png_ptr->error_fn != NULL) |
| 98 | (*(png_ptr->error_fn))(png_ptr, ""); |
| 99 | |
| 100 | /* If the custom handler doesn't exist, or if it returns, |
| 101 | use the default handler, which will not return. */ |
| 102 | png_default_error(png_ptr, ""); |
| 103 | } |
| 104 | #endif /* PNG_ERROR_TEXT_SUPPORTED */ |
| 105 | |
| 106 | /* Utility to safely appends strings to a buffer. This never errors out so |
| 107 | * error checking is not required in the caller. |
| 108 | */ |
| 109 | size_t |
| 110 | png_safecat(png_charp buffer, size_t bufsize, size_t pos, |
| 111 | png_const_charp string) |
| 112 | { |
| 113 | if (buffer != NULL && pos < bufsize) |
| 114 | { |
| 115 | if (string != NULL) |
| 116 | while (*string != '\0' && pos < bufsize-1) |
| 117 | buffer[pos++] = *string++; |
| 118 | |
| 119 | buffer[pos] = '\0'; |
| 120 | } |
| 121 | |
| 122 | return pos; |
| 123 | } |
| 124 | |
| 125 | #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) |
| 126 | /* Utility to dump an unsigned value into a buffer, given a start pointer and |
| 127 | * and end pointer (which should point just *beyond* the end of the buffer!) |
| 128 | * Returns the pointer to the start of the formatted string. |
| 129 | */ |
| 130 | png_charp |
| 131 | png_format_number(png_const_charp start, png_charp end, int format, |
| 132 | png_alloc_size_t number) |
| 133 | { |
| 134 | int count = 0; /* number of digits output */ |
| 135 | int mincount = 1; /* minimum number required */ |
| 136 | int output = 0; /* digit output (for the fixed point format) */ |
| 137 | |
| 138 | *--end = '\0'; |
| 139 | |
| 140 | /* This is written so that the loop always runs at least once, even with |
| 141 | * number zero. |
| 142 | */ |
| 143 | while (end > start && (number != 0 || count < mincount)) |
| 144 | { |
| 145 | |
| 146 | static const char digits[] = "0123456789ABCDEF"; |
| 147 | |
| 148 | switch (format) |
| 149 | { |
| 150 | case PNG_NUMBER_FORMAT_fixed: |
| 151 | /* Needs five digits (the fraction) */ |
| 152 | mincount = 5; |
| 153 | if (output || number % 10 != 0) |
| 154 | { |
| 155 | *--end = digits[number % 10]; |
| 156 | output = 1; |
| 157 | } |
| 158 | number /= 10; |
| 159 | break; |
| 160 | |
| 161 | case PNG_NUMBER_FORMAT_02u: |
| 162 | /* Expects at least 2 digits. */ |
| 163 | mincount = 2; |
| 164 | /* fall through */ |
| 165 | |
| 166 | case PNG_NUMBER_FORMAT_u: |
| 167 | *--end = digits[number % 10]; |
| 168 | number /= 10; |
| 169 | break; |
| 170 | |
| 171 | case PNG_NUMBER_FORMAT_02x: |
| 172 | /* This format expects at least two digits */ |
| 173 | mincount = 2; |
| 174 | /* fall through */ |
| 175 | |
| 176 | case PNG_NUMBER_FORMAT_x: |
| 177 | *--end = digits[number & 0xf]; |
| 178 | number >>= 4; |
| 179 | break; |
| 180 | |
| 181 | default: /* an error */ |
| 182 | number = 0; |
| 183 | break; |
| 184 | } |
| 185 | |
| 186 | /* Keep track of the number of digits added */ |
| 187 | ++count; |
| 188 | |
| 189 | /* Float a fixed number here: */ |
| 190 | if (format == PNG_NUMBER_FORMAT_fixed) if (count == 5) if (end > start) |
| 191 | { |
| 192 | /* End of the fraction, but maybe nothing was output? In that case |
| 193 | * drop the decimal point. If the number is a true zero handle that |
| 194 | * here. |
| 195 | */ |
| 196 | if (output) |
| 197 | *--end = '.'; |
| 198 | else if (number == 0) /* and !output */ |
| 199 | *--end = '0'; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | return end; |
| 204 | } |
| 205 | #endif |
| 206 | |
| 207 | #ifdef PNG_WARNINGS_SUPPORTED |
| 208 | /* This function is called whenever there is a non-fatal error. This function |
| 209 | * should not be changed. If there is a need to handle warnings differently, |
| 210 | * you should supply a replacement warning function and use |
| 211 | * png_set_error_fn() to replace the warning function at run-time. |
| 212 | */ |
| 213 | void PNGAPI |
| 214 | png_warning(png_structp png_ptr, png_const_charp warning_message) |
| 215 | { |
| 216 | int offset = 0; |
| 217 | if (png_ptr != NULL) |
| 218 | { |
| 219 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 220 | if (png_ptr->flags& |
| 221 | (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) |
| 222 | #endif |
| 223 | { |
| 224 | if (*warning_message == PNG_LITERAL_SHARP) |
| 225 | { |
| 226 | for (offset = 1; offset < 15; offset++) |
| 227 | if (warning_message[offset] == ' ') |
| 228 | break; |
| 229 | } |
| 230 | } |
| 231 | } |
| 232 | if (png_ptr != NULL && png_ptr->warning_fn != NULL) |
| 233 | (*(png_ptr->warning_fn))(png_ptr, warning_message + offset); |
| 234 | else |
| 235 | png_default_warning(png_ptr, warning_message + offset); |
| 236 | } |
| 237 | |
| 238 | /* These functions support 'formatted' warning messages with up to |
| 239 | * PNG_WARNING_PARAMETER_COUNT parameters. In the format string the parameter |
| 240 | * is introduced by @<number>, where 'number' starts at 1. This follows the |
| 241 | * standard established by X/Open for internationalizable error messages. |
| 242 | */ |
| 243 | void |
| 244 | png_warning_parameter(png_warning_parameters p, int number, |
| 245 | png_const_charp string) |
| 246 | { |
| 247 | if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT) |
| 248 | (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string); |
| 249 | } |
| 250 | |
| 251 | void |
| 252 | png_warning_parameter_unsigned(png_warning_parameters p, int number, int format, |
| 253 | png_alloc_size_t value) |
| 254 | { |
| 255 | char buffer[PNG_NUMBER_BUFFER_SIZE]; |
| 256 | png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value)); |
| 257 | } |
| 258 | |
| 259 | void |
| 260 | png_warning_parameter_signed(png_warning_parameters p, int number, int format, |
| 261 | png_int_32 value) |
| 262 | { |
| 263 | png_alloc_size_t u; |
| 264 | png_charp str; |
| 265 | char buffer[PNG_NUMBER_BUFFER_SIZE]; |
| 266 | |
| 267 | /* Avoid overflow by doing the negate in a png_alloc_size_t: */ |
| 268 | u = (png_alloc_size_t)value; |
| 269 | if (value < 0) |
| 270 | u = ~u + 1; |
| 271 | |
| 272 | str = PNG_FORMAT_NUMBER(buffer, format, u); |
| 273 | |
| 274 | if (value < 0 && str > buffer) |
| 275 | *--str = '-'; |
| 276 | |
| 277 | png_warning_parameter(p, number, str); |
| 278 | } |
| 279 | |
| 280 | void |
| 281 | png_formatted_warning(png_structp png_ptr, png_warning_parameters p, |
| 282 | png_const_charp message) |
| 283 | { |
| 284 | /* The internal buffer is just 128 bytes - enough for all our messages, |
| 285 | * overflow doesn't happen because this code checks! |
| 286 | */ |
| 287 | size_t i; |
| 288 | char msg[128]; |
| 289 | |
| 290 | for (i=0; i<(sizeof msg)-1 && *message != '\0'; ++i) |
| 291 | { |
| 292 | if (*message == '@') |
| 293 | { |
| 294 | int parameter = -1; |
| 295 | switch (*++message) |
| 296 | { |
| 297 | case '1': |
| 298 | parameter = 0; |
| 299 | break; |
| 300 | |
| 301 | case '2': |
| 302 | parameter = 1; |
| 303 | break; |
| 304 | |
| 305 | case '\0': |
| 306 | continue; /* To break out of the for loop above. */ |
| 307 | |
| 308 | default: |
| 309 | break; |
| 310 | } |
| 311 | |
| 312 | if (parameter >= 0 && parameter < PNG_WARNING_PARAMETER_COUNT) |
| 313 | { |
| 314 | /* Append this parameter */ |
| 315 | png_const_charp parm = p[parameter]; |
| 316 | png_const_charp pend = p[parameter] + (sizeof p[parameter]); |
| 317 | |
| 318 | /* No need to copy the trailing '\0' here, but there is no guarantee |
| 319 | * that parm[] has been initialized, so there is no guarantee of a |
| 320 | * trailing '\0': |
| 321 | */ |
| 322 | for (; i<(sizeof msg)-1 && parm != '\0' && parm < pend; ++i) |
| 323 | msg[i] = *parm++; |
| 324 | |
| 325 | ++message; |
| 326 | continue; |
| 327 | } |
| 328 | |
| 329 | /* else not a parameter and there is a character after the @ sign; just |
| 330 | * copy that. |
| 331 | */ |
| 332 | } |
| 333 | |
| 334 | /* At this point *message can't be '\0', even in the bad parameter case |
| 335 | * above where there is a lone '@' at the end of the message string. |
| 336 | */ |
| 337 | msg[i] = *message++; |
| 338 | } |
| 339 | |
| 340 | /* i is always less than (sizeof msg), so: */ |
| 341 | msg[i] = '\0'; |
| 342 | |
| 343 | /* And this is the formatted message: */ |
| 344 | png_warning(png_ptr, msg); |
| 345 | } |
| 346 | #endif /* PNG_WARNINGS_SUPPORTED */ |
| 347 | |
| 348 | #ifdef PNG_BENIGN_ERRORS_SUPPORTED |
| 349 | void PNGAPI |
| 350 | png_benign_error(png_structp png_ptr, png_const_charp error_message) |
| 351 | { |
| 352 | if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) |
| 353 | png_warning(png_ptr, error_message); |
| 354 | else |
| 355 | png_error(png_ptr, error_message); |
| 356 | } |
| 357 | #endif |
| 358 | |
| 359 | /* These utilities are used internally to build an error message that relates |
| 360 | * to the current chunk. The chunk name comes from png_ptr->chunk_name, |
| 361 | * this is used to prefix the message. The message is limited in length |
| 362 | * to 63 bytes, the name characters are output as hex digits wrapped in [] |
| 363 | * if the character is invalid. |
| 364 | */ |
| 365 | #define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97)) |
| 366 | static PNG_CONST char png_digit[16] = { |
| 367 | '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', |
| 368 | 'A', 'B', 'C', 'D', 'E', 'F' |
| 369 | }; |
| 370 | |
| 371 | #define PNG_MAX_ERROR_TEXT 64 |
| 372 | #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED) |
| 373 | static void /* PRIVATE */ |
| 374 | png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp |
| 375 | error_message) |
| 376 | { |
| 377 | png_uint_32 chunk_name = png_ptr->chunk_name; |
| 378 | int iout = 0, ishift = 24; |
| 379 | |
| 380 | while (ishift >= 0) |
| 381 | { |
| 382 | int c = (int)(chunk_name >> ishift) & 0xff; |
| 383 | |
| 384 | ishift -= 8; |
| 385 | if (isnonalpha(c)) |
| 386 | { |
| 387 | buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET; |
| 388 | buffer[iout++] = png_digit[(c & 0xf0) >> 4]; |
| 389 | buffer[iout++] = png_digit[c & 0x0f]; |
| 390 | buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET; |
| 391 | } |
| 392 | |
| 393 | else |
| 394 | { |
| 395 | buffer[iout++] = (char)c; |
| 396 | } |
| 397 | } |
| 398 | |
| 399 | if (error_message == NULL) |
| 400 | buffer[iout] = '\0'; |
| 401 | |
| 402 | else |
| 403 | { |
| 404 | int iin = 0; |
| 405 | |
| 406 | buffer[iout++] = ':'; |
| 407 | buffer[iout++] = ' '; |
| 408 | |
| 409 | while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0') |
| 410 | buffer[iout++] = error_message[iin++]; |
| 411 | |
| 412 | /* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */ |
| 413 | buffer[iout] = '\0'; |
| 414 | } |
| 415 | } |
| 416 | #endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */ |
| 417 | |
| 418 | #if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) |
| 419 | PNG_FUNCTION(void,PNGAPI |
| 420 | png_chunk_error,(png_structp png_ptr, png_const_charp error_message), |
| 421 | PNG_NORETURN) |
| 422 | { |
| 423 | char msg[18+PNG_MAX_ERROR_TEXT]; |
| 424 | if (png_ptr == NULL) |
| 425 | png_error(png_ptr, error_message); |
| 426 | |
| 427 | else |
| 428 | { |
| 429 | png_format_buffer(png_ptr, msg, error_message); |
| 430 | png_error(png_ptr, msg); |
| 431 | } |
| 432 | } |
| 433 | #endif /* PNG_READ_SUPPORTED && PNG_ERROR_TEXT_SUPPORTED */ |
| 434 | |
| 435 | #ifdef PNG_WARNINGS_SUPPORTED |
| 436 | void PNGAPI |
| 437 | png_chunk_warning(png_structp png_ptr, png_const_charp warning_message) |
| 438 | { |
| 439 | char msg[18+PNG_MAX_ERROR_TEXT]; |
| 440 | if (png_ptr == NULL) |
| 441 | png_warning(png_ptr, warning_message); |
| 442 | |
| 443 | else |
| 444 | { |
| 445 | png_format_buffer(png_ptr, msg, warning_message); |
| 446 | png_warning(png_ptr, msg); |
| 447 | } |
| 448 | } |
| 449 | #endif /* PNG_WARNINGS_SUPPORTED */ |
| 450 | |
| 451 | #ifdef PNG_READ_SUPPORTED |
| 452 | #ifdef PNG_BENIGN_ERRORS_SUPPORTED |
| 453 | void PNGAPI |
| 454 | png_chunk_benign_error(png_structp png_ptr, png_const_charp error_message) |
| 455 | { |
| 456 | if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) |
| 457 | png_chunk_warning(png_ptr, error_message); |
| 458 | |
| 459 | else |
| 460 | png_chunk_error(png_ptr, error_message); |
| 461 | } |
| 462 | #endif |
| 463 | #endif /* PNG_READ_SUPPORTED */ |
| 464 | |
| 465 | #ifdef PNG_ERROR_TEXT_SUPPORTED |
| 466 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 467 | PNG_FUNCTION(void, |
| 468 | png_fixed_error,(png_structp png_ptr, png_const_charp name),PNG_NORETURN) |
| 469 | { |
| 470 | # define fixed_message "fixed point overflow in " |
| 471 | # define fixed_message_ln ((sizeof fixed_message)-1) |
| 472 | int iin; |
| 473 | char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT]; |
| 474 | png_memcpy(msg, fixed_message, fixed_message_ln); |
| 475 | iin = 0; |
| 476 | if (name != NULL) while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0) |
| 477 | { |
| 478 | msg[fixed_message_ln + iin] = name[iin]; |
| 479 | ++iin; |
| 480 | } |
| 481 | msg[fixed_message_ln + iin] = 0; |
| 482 | png_error(png_ptr, msg); |
| 483 | } |
| 484 | #endif |
| 485 | #endif |
| 486 | |
| 487 | #ifdef PNG_SETJMP_SUPPORTED |
| 488 | /* This API only exists if ANSI-C style error handling is used, |
| 489 | * otherwise it is necessary for png_default_error to be overridden. |
| 490 | */ |
| 491 | jmp_buf* PNGAPI |
| 492 | png_set_longjmp_fn(png_structp png_ptr, png_longjmp_ptr longjmp_fn, |
| 493 | size_t jmp_buf_size) |
| 494 | { |
| 495 | if (png_ptr == NULL || jmp_buf_size != png_sizeof(jmp_buf)) |
| 496 | return NULL; |
| 497 | |
| 498 | png_ptr->longjmp_fn = longjmp_fn; |
| 499 | return &png_ptr->longjmp_buffer; |
| 500 | } |
| 501 | #endif |
| 502 | |
| 503 | /* This is the default error handling function. Note that replacements for |
| 504 | * this function MUST NOT RETURN, or the program will likely crash. This |
| 505 | * function is used by default, or if the program supplies NULL for the |
| 506 | * error function pointer in png_set_error_fn(). |
| 507 | */ |
| 508 | static PNG_FUNCTION(void /* PRIVATE */, |
| 509 | png_default_error,(png_structp png_ptr, png_const_charp error_message), |
| 510 | PNG_NORETURN) |
| 511 | { |
| 512 | #ifdef PNG_CONSOLE_IO_SUPPORTED |
| 513 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 514 | /* Check on NULL only added in 1.5.4 */ |
| 515 | if (error_message != NULL && *error_message == PNG_LITERAL_SHARP) |
| 516 | { |
| 517 | /* Strip "#nnnn " from beginning of error message. */ |
| 518 | int offset; |
| 519 | char error_number[16]; |
| 520 | for (offset = 0; offset<15; offset++) |
| 521 | { |
| 522 | error_number[offset] = error_message[offset + 1]; |
| 523 | if (error_message[offset] == ' ') |
| 524 | break; |
| 525 | } |
| 526 | |
| 527 | if ((offset > 1) && (offset < 15)) |
| 528 | { |
| 529 | error_number[offset - 1] = '\0'; |
| 530 | fprintf(stderr, "libpng error no. %s: %s", |
| 531 | error_number, error_message + offset + 1); |
| 532 | fprintf(stderr, PNG_STRING_NEWLINE); |
| 533 | } |
| 534 | |
| 535 | else |
| 536 | { |
| 537 | fprintf(stderr, "libpng error: %s, offset=%d", |
| 538 | error_message, offset); |
| 539 | fprintf(stderr, PNG_STRING_NEWLINE); |
| 540 | } |
| 541 | } |
| 542 | else |
| 543 | #endif |
| 544 | { |
| 545 | fprintf(stderr, "libpng error: %s", error_message ? error_message : |
| 546 | "undefined"); |
| 547 | fprintf(stderr, PNG_STRING_NEWLINE); |
| 548 | } |
| 549 | #else |
| 550 | PNG_UNUSED(error_message) /* Make compiler happy */ |
| 551 | #endif |
| 552 | png_longjmp(png_ptr, 1); |
| 553 | } |
| 554 | |
| 555 | PNG_FUNCTION(void,PNGAPI |
| 556 | png_longjmp,(png_structp png_ptr, int val),PNG_NORETURN) |
| 557 | { |
| 558 | #ifdef PNG_SETJMP_SUPPORTED |
| 559 | if (png_ptr && png_ptr->longjmp_fn) |
| 560 | { |
| 561 | # ifdef USE_FAR_KEYWORD |
| 562 | { |
| 563 | jmp_buf tmp_jmpbuf; |
| 564 | png_memcpy(tmp_jmpbuf, png_ptr->longjmp_buffer, png_sizeof(jmp_buf)); |
| 565 | png_ptr->longjmp_fn(tmp_jmpbuf, val); |
| 566 | } |
| 567 | |
| 568 | # else |
| 569 | png_ptr->longjmp_fn(png_ptr->longjmp_buffer, val); |
| 570 | # endif |
| 571 | } |
| 572 | #endif |
| 573 | /* Here if not setjmp support or if png_ptr is null. */ |
| 574 | PNG_ABORT(); |
| 575 | } |
| 576 | |
| 577 | #ifdef PNG_WARNINGS_SUPPORTED |
| 578 | /* This function is called when there is a warning, but the library thinks |
| 579 | * it can continue anyway. Replacement functions don't have to do anything |
| 580 | * here if you don't want them to. In the default configuration, png_ptr is |
| 581 | * not used, but it is passed in case it may be useful. |
| 582 | */ |
| 583 | static void /* PRIVATE */ |
| 584 | png_default_warning(png_structp png_ptr, png_const_charp warning_message) |
| 585 | { |
| 586 | #ifdef PNG_CONSOLE_IO_SUPPORTED |
| 587 | # ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 588 | if (*warning_message == PNG_LITERAL_SHARP) |
| 589 | { |
| 590 | int offset; |
| 591 | char warning_number[16]; |
| 592 | for (offset = 0; offset < 15; offset++) |
| 593 | { |
| 594 | warning_number[offset] = warning_message[offset + 1]; |
| 595 | if (warning_message[offset] == ' ') |
| 596 | break; |
| 597 | } |
| 598 | |
| 599 | if ((offset > 1) && (offset < 15)) |
| 600 | { |
| 601 | warning_number[offset + 1] = '\0'; |
| 602 | fprintf(stderr, "libpng warning no. %s: %s", |
| 603 | warning_number, warning_message + offset); |
| 604 | fprintf(stderr, PNG_STRING_NEWLINE); |
| 605 | } |
| 606 | |
| 607 | else |
| 608 | { |
| 609 | fprintf(stderr, "libpng warning: %s", |
| 610 | warning_message); |
| 611 | fprintf(stderr, PNG_STRING_NEWLINE); |
| 612 | } |
| 613 | } |
| 614 | else |
| 615 | # endif |
| 616 | |
| 617 | { |
| 618 | fprintf(stderr, "libpng warning: %s", warning_message); |
| 619 | fprintf(stderr, PNG_STRING_NEWLINE); |
| 620 | } |
| 621 | #else |
| 622 | PNG_UNUSED(warning_message) /* Make compiler happy */ |
| 623 | #endif |
| 624 | PNG_UNUSED(png_ptr) /* Make compiler happy */ |
| 625 | } |
| 626 | #endif /* PNG_WARNINGS_SUPPORTED */ |
| 627 | |
| 628 | /* This function is called when the application wants to use another method |
| 629 | * of handling errors and warnings. Note that the error function MUST NOT |
| 630 | * return to the calling routine or serious problems will occur. The return |
| 631 | * method used in the default routine calls longjmp(png_ptr->longjmp_buffer, 1) |
| 632 | */ |
| 633 | void PNGAPI |
| 634 | png_set_error_fn(png_structp png_ptr, png_voidp error_ptr, |
| 635 | png_error_ptr error_fn, png_error_ptr warning_fn) |
| 636 | { |
| 637 | if (png_ptr == NULL) |
| 638 | return; |
| 639 | |
| 640 | png_ptr->error_ptr = error_ptr; |
| 641 | png_ptr->error_fn = error_fn; |
| 642 | #ifdef PNG_WARNINGS_SUPPORTED |
| 643 | png_ptr->warning_fn = warning_fn; |
| 644 | #else |
| 645 | PNG_UNUSED(warning_fn) |
| 646 | #endif |
| 647 | } |
| 648 | |
| 649 | |
| 650 | /* This function returns a pointer to the error_ptr associated with the user |
| 651 | * functions. The application should free any memory associated with this |
| 652 | * pointer before png_write_destroy and png_read_destroy are called. |
| 653 | */ |
| 654 | png_voidp PNGAPI |
| 655 | png_get_error_ptr(png_const_structp png_ptr) |
| 656 | { |
| 657 | if (png_ptr == NULL) |
| 658 | return NULL; |
| 659 | |
| 660 | return ((png_voidp)png_ptr->error_ptr); |
| 661 | } |
| 662 | |
| 663 | |
| 664 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 665 | void PNGAPI |
| 666 | png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode) |
| 667 | { |
| 668 | if (png_ptr != NULL) |
| 669 | { |
| 670 | png_ptr->flags &= |
| 671 | ((~(PNG_FLAG_STRIP_ERROR_NUMBERS | |
| 672 | PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode); |
| 673 | } |
| 674 | } |
| 675 | #endif |
| 676 | #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ |