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| 1 | |
| 2 /* pngerror.c - stub functions for i/o and memory allocation | |
| 3 * | |
| 4 * Last changed in libpng 1.6.15 [November 20, 2014] | |
| 5 * Copyright (c) 1998-2014 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_const_structrp 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_const_structrp png_ptr, | |
| 29 png_const_charp warning_message)); | |
| 30 #endif /* WARNINGS */ | |
| 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_const_structrp png_ptr, png_const_charp error_message), | |
| 40 PNG_NORETURN) | |
| 41 { | |
| 42 #ifdef PNG_ERROR_NUMBERS_SUPPORTED | |
| 43 char msg[16]; | |
| 44 if (png_ptr != NULL) | |
| 45 { | |
| 46 if ((png_ptr->flags & | |
| 47 (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) != 0 | |
| 48 { | |
| 49 if (*error_message == PNG_LITERAL_SHARP) | |
| 50 { | |
| 51 /* Strip "#nnnn " from beginning of error message. */ | |
| 52 int offset; | |
| 53 for (offset = 1; offset<15; offset++) | |
| 54 if (error_message[offset] == ' ') | |
| 55 break; | |
| 56 | |
| 57 if ((png_ptr->flags & PNG_FLAG_STRIP_ERROR_TEXT) != 0) | |
| 58 { | |
| 59 int i; | |
| 60 for (i = 0; i < offset - 1; i++) | |
| 61 msg[i] = error_message[i + 1]; | |
| 62 msg[i - 1] = '\0'; | |
| 63 error_message = msg; | |
| 64 } | |
| 65 | |
| 66 else | |
| 67 error_message += offset; | |
| 68 } | |
| 69 | |
| 70 else | |
| 71 { | |
| 72 if ((png_ptr->flags & PNG_FLAG_STRIP_ERROR_TEXT) != 0) | |
| 73 { | |
| 74 msg[0] = '0'; | |
| 75 msg[1] = '\0'; | |
| 76 error_message = msg; | |
| 77 } | |
| 78 } | |
| 79 } | |
| 80 } | |
| 81 #endif | |
| 82 if (png_ptr != NULL && png_ptr->error_fn != NULL) | |
| 83 (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr), | |
| 84 error_message); | |
| 85 | |
| 86 /* If the custom handler doesn't exist, or if it returns, | |
| 87 use the default handler, which will not return. */ | |
| 88 png_default_error(png_ptr, error_message); | |
| 89 } | |
| 90 #else | |
| 91 PNG_FUNCTION(void,PNGAPI | |
| 92 png_err,(png_const_structrp png_ptr),PNG_NORETURN) | |
| 93 { | |
| 94 /* Prior to 1.5.2 the error_fn received a NULL pointer, expressed | |
| 95 * erroneously as '\0', instead of the empty string "". This was | |
| 96 * apparently an error, introduced in libpng-1.2.20, and png_default_error | |
| 97 * will crash in this case. | |
| 98 */ | |
| 99 if (png_ptr != NULL && png_ptr->error_fn != NULL) | |
| 100 (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr), ""); | |
| 101 | |
| 102 /* If the custom handler doesn't exist, or if it returns, | |
| 103 use the default handler, which will not return. */ | |
| 104 png_default_error(png_ptr, ""); | |
| 105 } | |
| 106 #endif /* ERROR_TEXT */ | |
| 107 | |
| 108 /* Utility to safely appends strings to a buffer. This never errors out so | |
| 109 * error checking is not required in the caller. | |
| 110 */ | |
| 111 size_t | |
| 112 png_safecat(png_charp buffer, size_t bufsize, size_t pos, | |
| 113 png_const_charp string) | |
| 114 { | |
| 115 if (buffer != NULL && pos < bufsize) | |
| 116 { | |
| 117 if (string != NULL) | |
| 118 while (*string != '\0' && pos < bufsize-1) | |
| 119 buffer[pos++] = *string++; | |
| 120 | |
| 121 buffer[pos] = '\0'; | |
| 122 } | |
| 123 | |
| 124 return pos; | |
| 125 } | |
| 126 | |
| 127 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) | |
| 128 /* Utility to dump an unsigned value into a buffer, given a start pointer and | |
| 129 * and end pointer (which should point just *beyond* the end of the buffer!) | |
| 130 * Returns the pointer to the start of the formatted string. | |
| 131 */ | |
| 132 png_charp | |
| 133 png_format_number(png_const_charp start, png_charp end, int format, | |
| 134 png_alloc_size_t number) | |
| 135 { | |
| 136 int count = 0; /* number of digits output */ | |
| 137 int mincount = 1; /* minimum number required */ | |
| 138 int output = 0; /* digit output (for the fixed point format) */ | |
| 139 | |
| 140 *--end = '\0'; | |
| 141 | |
| 142 /* This is written so that the loop always runs at least once, even with | |
| 143 * number zero. | |
| 144 */ | |
| 145 while (end > start && (number != 0 || count < mincount)) | |
| 146 { | |
| 147 | |
| 148 static const char digits[] = "0123456789ABCDEF"; | |
| 149 | |
| 150 switch (format) | |
| 151 { | |
| 152 case PNG_NUMBER_FORMAT_fixed: | |
| 153 /* Needs five digits (the fraction) */ | |
| 154 mincount = 5; | |
| 155 if (output != 0 || number % 10 != 0) | |
| 156 { | |
| 157 *--end = digits[number % 10]; | |
| 158 output = 1; | |
| 159 } | |
| 160 number /= 10; | |
| 161 break; | |
| 162 | |
| 163 case PNG_NUMBER_FORMAT_02u: | |
| 164 /* Expects at least 2 digits. */ | |
| 165 mincount = 2; | |
| 166 /* FALL THROUGH */ | |
| 167 | |
| 168 case PNG_NUMBER_FORMAT_u: | |
| 169 *--end = digits[number % 10]; | |
| 170 number /= 10; | |
| 171 break; | |
| 172 | |
| 173 case PNG_NUMBER_FORMAT_02x: | |
| 174 /* This format expects at least two digits */ | |
| 175 mincount = 2; | |
| 176 /* FALL THROUGH */ | |
| 177 | |
| 178 case PNG_NUMBER_FORMAT_x: | |
| 179 *--end = digits[number & 0xf]; | |
| 180 number >>= 4; | |
| 181 break; | |
| 182 | |
| 183 default: /* an error */ | |
| 184 number = 0; | |
| 185 break; | |
| 186 } | |
| 187 | |
| 188 /* Keep track of the number of digits added */ | |
| 189 ++count; | |
| 190 | |
| 191 /* Float a fixed number here: */ | |
| 192 if ((format == PNG_NUMBER_FORMAT_fixed) && (count == 5) && (end > start)) | |
| 193 { | |
| 194 /* End of the fraction, but maybe nothing was output? In that case | |
| 195 * drop the decimal point. If the number is a true zero handle that | |
| 196 * here. | |
| 197 */ | |
| 198 if (output != 0) | |
| 199 *--end = '.'; | |
| 200 else if (number == 0) /* and !output */ | |
| 201 *--end = '0'; | |
| 202 } | |
| 203 } | |
| 204 | |
| 205 return end; | |
| 206 } | |
| 207 #endif | |
| 208 | |
| 209 #ifdef PNG_WARNINGS_SUPPORTED | |
| 210 /* This function is called whenever there is a non-fatal error. This function | |
| 211 * should not be changed. If there is a need to handle warnings differently, | |
| 212 * you should supply a replacement warning function and use | |
| 213 * png_set_error_fn() to replace the warning function at run-time. | |
| 214 */ | |
| 215 void PNGAPI | |
| 216 png_warning(png_const_structrp png_ptr, png_const_charp warning_message) | |
| 217 { | |
| 218 int offset = 0; | |
| 219 if (png_ptr != NULL) | |
| 220 { | |
| 221 #ifdef PNG_ERROR_NUMBERS_SUPPORTED | |
| 222 if ((png_ptr->flags & | |
| 223 (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) != 0) | |
| 224 #endif | |
| 225 { | |
| 226 if (*warning_message == PNG_LITERAL_SHARP) | |
| 227 { | |
| 228 for (offset = 1; offset < 15; offset++) | |
| 229 if (warning_message[offset] == ' ') | |
| 230 break; | |
| 231 } | |
| 232 } | |
| 233 } | |
| 234 if (png_ptr != NULL && png_ptr->warning_fn != NULL) | |
| 235 (*(png_ptr->warning_fn))(png_constcast(png_structrp,png_ptr), | |
| 236 warning_message + offset); | |
| 237 else | |
| 238 png_default_warning(png_ptr, warning_message + offset); | |
| 239 } | |
| 240 | |
| 241 /* These functions support 'formatted' warning messages with up to | |
| 242 * PNG_WARNING_PARAMETER_COUNT parameters. In the format string the parameter | |
| 243 * is introduced by @<number>, where 'number' starts at 1. This follows the | |
| 244 * standard established by X/Open for internationalizable error messages. | |
| 245 */ | |
| 246 void | |
| 247 png_warning_parameter(png_warning_parameters p, int number, | |
| 248 png_const_charp string) | |
| 249 { | |
| 250 if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT) | |
| 251 (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string); | |
| 252 } | |
| 253 | |
| 254 void | |
| 255 png_warning_parameter_unsigned(png_warning_parameters p, int number, int format, | |
| 256 png_alloc_size_t value) | |
| 257 { | |
| 258 char buffer[PNG_NUMBER_BUFFER_SIZE]; | |
| 259 png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value)); | |
| 260 } | |
| 261 | |
| 262 void | |
| 263 png_warning_parameter_signed(png_warning_parameters p, int number, int format, | |
| 264 png_int_32 value) | |
| 265 { | |
| 266 png_alloc_size_t u; | |
| 267 png_charp str; | |
| 268 char buffer[PNG_NUMBER_BUFFER_SIZE]; | |
| 269 | |
| 270 /* Avoid overflow by doing the negate in a png_alloc_size_t: */ | |
| 271 u = (png_alloc_size_t)value; | |
| 272 if (value < 0) | |
| 273 u = ~u + 1; | |
| 274 | |
| 275 str = PNG_FORMAT_NUMBER(buffer, format, u); | |
| 276 | |
| 277 if (value < 0 && str > buffer) | |
| 278 *--str = '-'; | |
| 279 | |
| 280 png_warning_parameter(p, number, str); | |
| 281 } | |
| 282 | |
| 283 void | |
| 284 png_formatted_warning(png_const_structrp png_ptr, png_warning_parameters p, | |
| 285 png_const_charp message) | |
| 286 { | |
| 287 /* The internal buffer is just 192 bytes - enough for all our messages, | |
| 288 * overflow doesn't happen because this code checks! If someone figures | |
| 289 * out how to send us a message longer than 192 bytes, all that will | |
| 290 * happen is that the message will be truncated appropriately. | |
| 291 */ | |
| 292 size_t i = 0; /* Index in the msg[] buffer: */ | |
| 293 char msg[192]; | |
| 294 | |
| 295 /* Each iteration through the following loop writes at most one character | |
| 296 * to msg[i++] then returns here to validate that there is still space for | |
| 297 * the trailing '\0'. It may (in the case of a parameter) read more than | |
| 298 * one character from message[]; it must check for '\0' and continue to the | |
| 299 * test if it finds the end of string. | |
| 300 */ | |
| 301 while (i<(sizeof msg)-1 && *message != '\0') | |
| 302 { | |
| 303 /* '@' at end of string is now just printed (previously it was skipped); | |
| 304 * it is an error in the calling code to terminate the string with @. | |
| 305 */ | |
| 306 if (p != NULL && *message == '@' && message[1] != '\0') | |
| 307 { | |
| 308 int parameter_char = *++message; /* Consume the '@' */ | |
| 309 static const char valid_parameters[] = "123456789"; | |
| 310 int parameter = 0; | |
| 311 | |
| 312 /* Search for the parameter digit, the index in the string is the | |
| 313 * parameter to use. | |
| 314 */ | |
| 315 while (valid_parameters[parameter] != parameter_char && | |
| 316 valid_parameters[parameter] != '\0') | |
| 317 ++parameter; | |
| 318 | |
| 319 /* If the parameter digit is out of range it will just get printed. */ | |
| 320 if (parameter < PNG_WARNING_PARAMETER_COUNT) | |
| 321 { | |
| 322 /* Append this parameter */ | |
| 323 png_const_charp parm = p[parameter]; | |
| 324 png_const_charp pend = p[parameter] + (sizeof p[parameter]); | |
| 325 | |
| 326 /* No need to copy the trailing '\0' here, but there is no guarantee | |
| 327 * that parm[] has been initialized, so there is no guarantee of a | |
| 328 * trailing '\0': | |
| 329 */ | |
| 330 while (i<(sizeof msg)-1 && *parm != '\0' && parm < pend) | |
| 331 msg[i++] = *parm++; | |
| 332 | |
| 333 /* Consume the parameter digit too: */ | |
| 334 ++message; | |
| 335 continue; | |
| 336 } | |
| 337 | |
| 338 /* else not a parameter and there is a character after the @ sign; just | |
| 339 * copy that. This is known not to be '\0' because of the test above. | |
| 340 */ | |
| 341 } | |
| 342 | |
| 343 /* At this point *message can't be '\0', even in the bad parameter case | |
| 344 * above where there is a lone '@' at the end of the message string. | |
| 345 */ | |
| 346 msg[i++] = *message++; | |
| 347 } | |
| 348 | |
| 349 /* i is always less than (sizeof msg), so: */ | |
| 350 msg[i] = '\0'; | |
| 351 | |
| 352 /* And this is the formatted message. It may be larger than | |
| 353 * PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these | |
| 354 * are not (currently) formatted. | |
| 355 */ | |
| 356 png_warning(png_ptr, msg); | |
| 357 } | |
| 358 #endif /* WARNINGS */ | |
| 359 | |
| 360 #ifdef PNG_BENIGN_ERRORS_SUPPORTED | |
| 361 void PNGAPI | |
| 362 png_benign_error(png_const_structrp png_ptr, png_const_charp error_message) | |
| 363 { | |
| 364 if ((png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) != 0) | |
| 365 { | |
| 366 # ifdef PNG_READ_SUPPORTED | |
| 367 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && | |
| 368 png_ptr->chunk_name != 0) | |
| 369 png_chunk_warning(png_ptr, error_message); | |
| 370 else | |
| 371 # endif | |
| 372 png_warning(png_ptr, error_message); | |
| 373 } | |
| 374 | |
| 375 else | |
| 376 { | |
| 377 # ifdef PNG_READ_SUPPORTED | |
| 378 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && | |
| 379 png_ptr->chunk_name != 0) | |
| 380 png_chunk_error(png_ptr, error_message); | |
| 381 else | |
| 382 # endif | |
| 383 png_error(png_ptr, error_message); | |
| 384 } | |
| 385 | |
| 386 # ifndef PNG_ERROR_TEXT_SUPPORTED | |
| 387 PNG_UNUSED(error_message) | |
| 388 # endif | |
| 389 } | |
| 390 | |
| 391 void /* PRIVATE */ | |
| 392 png_app_warning(png_const_structrp png_ptr, png_const_charp error_message) | |
| 393 { | |
| 394 if ((png_ptr->flags & PNG_FLAG_APP_WARNINGS_WARN) != 0) | |
| 395 png_warning(png_ptr, error_message); | |
| 396 else | |
| 397 png_error(png_ptr, error_message); | |
| 398 | |
| 399 # ifndef PNG_ERROR_TEXT_SUPPORTED | |
| 400 PNG_UNUSED(error_message) | |
| 401 # endif | |
| 402 } | |
| 403 | |
| 404 void /* PRIVATE */ | |
| 405 png_app_error(png_const_structrp png_ptr, png_const_charp error_message) | |
| 406 { | |
| 407 if ((png_ptr->flags & PNG_FLAG_APP_ERRORS_WARN) != 0) | |
| 408 png_warning(png_ptr, error_message); | |
| 409 else | |
| 410 png_error(png_ptr, error_message); | |
| 411 | |
| 412 # ifndef PNG_ERROR_TEXT_SUPPORTED | |
| 413 PNG_UNUSED(error_message) | |
| 414 # endif | |
| 415 } | |
| 416 #endif /* BENIGN_ERRORS */ | |
| 417 | |
| 418 #define PNG_MAX_ERROR_TEXT 196 /* Currently limited by profile_error in png.c */ | |
| 419 #if defined(PNG_WARNINGS_SUPPORTED) || \ | |
| 420 (defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)) | |
| 421 /* These utilities are used internally to build an error message that relates | |
| 422 * to the current chunk. The chunk name comes from png_ptr->chunk_name, | |
| 423 * which is used to prefix the message. The message is limited in length | |
| 424 * to 63 bytes. The name characters are output as hex digits wrapped in [] | |
| 425 * if the character is invalid. | |
| 426 */ | |
| 427 #define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97)) | |
| 428 static PNG_CONST char png_digit[16] = { | |
| 429 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', | |
| 430 'A', 'B', 'C', 'D', 'E', 'F' | |
| 431 }; | |
| 432 | |
| 433 static void /* PRIVATE */ | |
| 434 png_format_buffer(png_const_structrp png_ptr, png_charp buffer, png_const_charp | |
| 435 error_message) | |
| 436 { | |
| 437 png_uint_32 chunk_name = png_ptr->chunk_name; | |
| 438 int iout = 0, ishift = 24; | |
| 439 | |
| 440 while (ishift >= 0) | |
| 441 { | |
| 442 int c = (int)(chunk_name >> ishift) & 0xff; | |
| 443 | |
| 444 ishift -= 8; | |
| 445 if (isnonalpha(c) != 0) | |
| 446 { | |
| 447 buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET; | |
| 448 buffer[iout++] = png_digit[(c & 0xf0) >> 4]; | |
| 449 buffer[iout++] = png_digit[c & 0x0f]; | |
| 450 buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET; | |
| 451 } | |
| 452 | |
| 453 else | |
| 454 { | |
| 455 buffer[iout++] = (char)c; | |
| 456 } | |
| 457 } | |
| 458 | |
| 459 if (error_message == NULL) | |
| 460 buffer[iout] = '\0'; | |
| 461 | |
| 462 else | |
| 463 { | |
| 464 int iin = 0; | |
| 465 | |
| 466 buffer[iout++] = ':'; | |
| 467 buffer[iout++] = ' '; | |
| 468 | |
| 469 while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0') | |
| 470 buffer[iout++] = error_message[iin++]; | |
| 471 | |
| 472 /* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */ | |
| 473 buffer[iout] = '\0'; | |
| 474 } | |
| 475 } | |
| 476 #endif /* WARNINGS || ERROR_TEXT */ | |
| 477 | |
| 478 #if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) | |
| 479 PNG_FUNCTION(void,PNGAPI | |
| 480 png_chunk_error,(png_const_structrp png_ptr, png_const_charp error_message), | |
| 481 PNG_NORETURN) | |
| 482 { | |
| 483 char msg[18+PNG_MAX_ERROR_TEXT]; | |
| 484 if (png_ptr == NULL) | |
| 485 png_error(png_ptr, error_message); | |
| 486 | |
| 487 else | |
| 488 { | |
| 489 png_format_buffer(png_ptr, msg, error_message); | |
| 490 png_error(png_ptr, msg); | |
| 491 } | |
| 492 } | |
| 493 #endif /* READ && ERROR_TEXT */ | |
| 494 | |
| 495 #ifdef PNG_WARNINGS_SUPPORTED | |
| 496 void PNGAPI | |
| 497 png_chunk_warning(png_const_structrp png_ptr, png_const_charp warning_message) | |
| 498 { | |
| 499 char msg[18+PNG_MAX_ERROR_TEXT]; | |
| 500 if (png_ptr == NULL) | |
| 501 png_warning(png_ptr, warning_message); | |
| 502 | |
| 503 else | |
| 504 { | |
| 505 png_format_buffer(png_ptr, msg, warning_message); | |
| 506 png_warning(png_ptr, msg); | |
| 507 } | |
| 508 } | |
| 509 #endif /* WARNINGS */ | |
| 510 | |
| 511 #ifdef PNG_READ_SUPPORTED | |
| 512 #ifdef PNG_BENIGN_ERRORS_SUPPORTED | |
| 513 void PNGAPI | |
| 514 png_chunk_benign_error(png_const_structrp png_ptr, png_const_charp | |
| 515 error_message) | |
| 516 { | |
| 517 if ((png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) != 0) | |
| 518 png_chunk_warning(png_ptr, error_message); | |
| 519 | |
| 520 else | |
| 521 png_chunk_error(png_ptr, error_message); | |
| 522 | |
| 523 # ifndef PNG_ERROR_TEXT_SUPPORTED | |
| 524 PNG_UNUSED(error_message) | |
| 525 # endif | |
| 526 } | |
| 527 #endif | |
| 528 #endif /* READ */ | |
| 529 | |
| 530 void /* PRIVATE */ | |
| 531 png_chunk_report(png_const_structrp png_ptr, png_const_charp message, int error) | |
| 532 { | |
| 533 # ifndef PNG_WARNINGS_SUPPORTED | |
| 534 PNG_UNUSED(message) | |
| 535 # endif | |
| 536 | |
| 537 /* This is always supported, but for just read or just write it | |
| 538 * unconditionally does the right thing. | |
| 539 */ | |
| 540 # if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED) | |
| 541 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0) | |
| 542 # endif | |
| 543 | |
| 544 # ifdef PNG_READ_SUPPORTED | |
| 545 { | |
| 546 if (error < PNG_CHUNK_ERROR) | |
| 547 png_chunk_warning(png_ptr, message); | |
| 548 | |
| 549 else | |
| 550 png_chunk_benign_error(png_ptr, message); | |
| 551 } | |
| 552 # endif | |
| 553 | |
| 554 # if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED) | |
| 555 else if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0) | |
| 556 # endif | |
| 557 | |
| 558 # ifdef PNG_WRITE_SUPPORTED | |
| 559 { | |
| 560 if (error < PNG_CHUNK_WRITE_ERROR) | |
| 561 png_app_warning(png_ptr, message); | |
| 562 | |
| 563 else | |
| 564 png_app_error(png_ptr, message); | |
| 565 } | |
| 566 # endif | |
| 567 } | |
| 568 | |
| 569 #ifdef PNG_ERROR_TEXT_SUPPORTED | |
| 570 #ifdef PNG_FLOATING_POINT_SUPPORTED | |
| 571 PNG_FUNCTION(void, | |
| 572 png_fixed_error,(png_const_structrp png_ptr, png_const_charp name),PNG_NORETURN) | |
| 573 { | |
| 574 # define fixed_message "fixed point overflow in " | |
| 575 # define fixed_message_ln ((sizeof fixed_message)-1) | |
| 576 int iin; | |
| 577 char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT]; | |
| 578 memcpy(msg, fixed_message, fixed_message_ln); | |
| 579 iin = 0; | |
| 580 if (name != NULL) | |
| 581 while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0) | |
| 582 { | |
| 583 msg[fixed_message_ln + iin] = name[iin]; | |
| 584 ++iin; | |
| 585 } | |
| 586 msg[fixed_message_ln + iin] = 0; | |
| 587 png_error(png_ptr, msg); | |
| 588 } | |
| 589 #endif | |
| 590 #endif | |
| 591 | |
| 592 #ifdef PNG_SETJMP_SUPPORTED | |
| 593 /* This API only exists if ANSI-C style error handling is used, | |
| 594 * otherwise it is necessary for png_default_error to be overridden. | |
| 595 */ | |
| 596 jmp_buf* PNGAPI | |
| 597 png_set_longjmp_fn(png_structrp png_ptr, png_longjmp_ptr longjmp_fn, | |
| 598 size_t jmp_buf_size) | |
| 599 { | |
| 600 /* From libpng 1.6.0 the app gets one chance to set a 'jmpbuf_size' value | |
| 601 * and it must not change after that. Libpng doesn't care how big the | |
| 602 * buffer is, just that it doesn't change. | |
| 603 * | |
| 604 * If the buffer size is no *larger* than the size of jmp_buf when libpng is | |
| 605 * compiled a built in jmp_buf is returned; this preserves the pre-1.6.0 | |
| 606 * semantics that this call will not fail. If the size is larger, however, | |
| 607 * the buffer is allocated and this may fail, causing the function to return | |
| 608 * NULL. | |
| 609 */ | |
| 610 if (png_ptr == NULL) | |
| 611 return NULL; | |
| 612 | |
| 613 if (png_ptr->jmp_buf_ptr == NULL) | |
| 614 { | |
| 615 png_ptr->jmp_buf_size = 0; /* not allocated */ | |
| 616 | |
| 617 if (jmp_buf_size <= (sizeof png_ptr->jmp_buf_local)) | |
| 618 png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; | |
| 619 | |
| 620 else | |
| 621 { | |
| 622 png_ptr->jmp_buf_ptr = png_voidcast(jmp_buf *, | |
| 623 png_malloc_warn(png_ptr, jmp_buf_size)); | |
| 624 | |
| 625 if (png_ptr->jmp_buf_ptr == NULL) | |
| 626 return NULL; /* new NULL return on OOM */ | |
| 627 | |
| 628 png_ptr->jmp_buf_size = jmp_buf_size; | |
| 629 } | |
| 630 } | |
| 631 | |
| 632 else /* Already allocated: check the size */ | |
| 633 { | |
| 634 size_t size = png_ptr->jmp_buf_size; | |
| 635 | |
| 636 if (size == 0) | |
| 637 { | |
| 638 size = (sizeof png_ptr->jmp_buf_local); | |
| 639 if (png_ptr->jmp_buf_ptr != &png_ptr->jmp_buf_local) | |
| 640 { | |
| 641 /* This is an internal error in libpng: somehow we have been left | |
| 642 * with a stack allocated jmp_buf when the application regained | |
| 643 * control. It's always possible to fix this up, but for the moment | |
| 644 * this is a png_error because that makes it easy to detect. | |
| 645 */ | |
| 646 png_error(png_ptr, "Libpng jmp_buf still allocated"); | |
| 647 /* png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; */ | |
| 648 } | |
| 649 } | |
| 650 | |
| 651 if (size != jmp_buf_size) | |
| 652 { | |
| 653 png_warning(png_ptr, "Application jmp_buf size changed"); | |
| 654 return NULL; /* caller will probably crash: no choice here */ | |
| 655 } | |
| 656 } | |
| 657 | |
| 658 /* Finally fill in the function, now we have a satisfactory buffer. It is | |
| 659 * valid to change the function on every call. | |
| 660 */ | |
| 661 png_ptr->longjmp_fn = longjmp_fn; | |
| 662 return png_ptr->jmp_buf_ptr; | |
| 663 } | |
| 664 | |
| 665 void /* PRIVATE */ | |
| 666 png_free_jmpbuf(png_structrp png_ptr) | |
| 667 { | |
| 668 if (png_ptr != NULL) | |
| 669 { | |
| 670 jmp_buf *jb = png_ptr->jmp_buf_ptr; | |
| 671 | |
| 672 /* A size of 0 is used to indicate a local, stack, allocation of the | |
| 673 * pointer; used here and in png.c | |
| 674 */ | |
| 675 if (jb != NULL && png_ptr->jmp_buf_size > 0) | |
| 676 { | |
| 677 | |
| 678 /* This stuff is so that a failure to free the error control structure | |
| 679 * does not leave libpng in a state with no valid error handling: the | |
| 680 * free always succeeds, if there is an error it gets ignored. | |
| 681 */ | |
| 682 if (jb != &png_ptr->jmp_buf_local) | |
| 683 { | |
| 684 /* Make an internal, libpng, jmp_buf to return here */ | |
| 685 jmp_buf free_jmp_buf; | |
| 686 | |
| 687 if (!setjmp(free_jmp_buf)) | |
| 688 { | |
| 689 png_ptr->jmp_buf_ptr = &free_jmp_buf; /* come back here */ | |
| 690 png_ptr->jmp_buf_size = 0; /* stack allocation */ | |
| 691 png_ptr->longjmp_fn = longjmp; | |
| 692 png_free(png_ptr, jb); /* Return to setjmp on error */ | |
| 693 } | |
| 694 } | |
| 695 } | |
| 696 | |
| 697 /* *Always* cancel everything out: */ | |
| 698 png_ptr->jmp_buf_size = 0; | |
| 699 png_ptr->jmp_buf_ptr = NULL; | |
| 700 png_ptr->longjmp_fn = 0; | |
| 701 } | |
| 702 } | |
| 703 #endif | |
| 704 | |
| 705 /* This is the default error handling function. Note that replacements for | |
| 706 * this function MUST NOT RETURN, or the program will likely crash. This | |
| 707 * function is used by default, or if the program supplies NULL for the | |
| 708 * error function pointer in png_set_error_fn(). | |
| 709 */ | |
| 710 static PNG_FUNCTION(void /* PRIVATE */, | |
| 711 png_default_error,(png_const_structrp png_ptr, png_const_charp error_message), | |
| 712 PNG_NORETURN) | |
| 713 { | |
| 714 #ifdef PNG_CONSOLE_IO_SUPPORTED | |
| 715 #ifdef PNG_ERROR_NUMBERS_SUPPORTED | |
| 716 /* Check on NULL only added in 1.5.4 */ | |
| 717 if (error_message != NULL && *error_message == PNG_LITERAL_SHARP) | |
| 718 { | |
| 719 /* Strip "#nnnn " from beginning of error message. */ | |
| 720 int offset; | |
| 721 char error_number[16]; | |
| 722 for (offset = 0; offset<15; offset++) | |
| 723 { | |
| 724 error_number[offset] = error_message[offset + 1]; | |
| 725 if (error_message[offset] == ' ') | |
| 726 break; | |
| 727 } | |
| 728 | |
| 729 if ((offset > 1) && (offset < 15)) | |
| 730 { | |
| 731 error_number[offset - 1] = '\0'; | |
| 732 fprintf(stderr, "libpng error no. %s: %s", | |
| 733 error_number, error_message + offset + 1); | |
| 734 fprintf(stderr, PNG_STRING_NEWLINE); | |
| 735 } | |
| 736 | |
| 737 else | |
| 738 { | |
| 739 fprintf(stderr, "libpng error: %s, offset=%d", | |
| 740 error_message, offset); | |
| 741 fprintf(stderr, PNG_STRING_NEWLINE); | |
| 742 } | |
| 743 } | |
| 744 else | |
| 745 #endif | |
| 746 { | |
| 747 fprintf(stderr, "libpng error: %s", error_message ? error_message : | |
| 748 "undefined"); | |
| 749 fprintf(stderr, PNG_STRING_NEWLINE); | |
| 750 } | |
| 751 #else | |
| 752 PNG_UNUSED(error_message) /* Make compiler happy */ | |
| 753 #endif | |
| 754 png_longjmp(png_ptr, 1); | |
| 755 } | |
| 756 | |
| 757 PNG_FUNCTION(void,PNGAPI | |
| 758 png_longjmp,(png_const_structrp png_ptr, int val),PNG_NORETURN) | |
| 759 { | |
| 760 #ifdef PNG_SETJMP_SUPPORTED | |
| 761 if (png_ptr != NULL && png_ptr->longjmp_fn != NULL && | |
| 762 png_ptr->jmp_buf_ptr != NULL) | |
| 763 png_ptr->longjmp_fn(*png_ptr->jmp_buf_ptr, val); | |
| 764 #else | |
| 765 PNG_UNUSED(png_ptr) | |
| 766 PNG_UNUSED(val) | |
| 767 #endif | |
| 768 | |
| 769 /* If control reaches this point, png_longjmp() must not return. The only | |
| 770 * choice is to terminate the whole process (or maybe the thread); to do | |
| 771 * this the ANSI-C abort() function is used unless a different method is | |
| 772 * implemented by overriding the default configuration setting for | |
| 773 * PNG_ABORT(). | |
| 774 */ | |
| 775 PNG_ABORT(); | |
| 776 } | |
| 777 | |
| 778 #ifdef PNG_WARNINGS_SUPPORTED | |
| 779 /* This function is called when there is a warning, but the library thinks | |
| 780 * it can continue anyway. Replacement functions don't have to do anything | |
| 781 * here if you don't want them to. In the default configuration, png_ptr is | |
| 782 * not used, but it is passed in case it may be useful. | |
| 783 */ | |
| 784 static void /* PRIVATE */ | |
| 785 png_default_warning(png_const_structrp png_ptr, png_const_charp warning_message) | |
| 786 { | |
| 787 #ifdef PNG_CONSOLE_IO_SUPPORTED | |
| 788 # ifdef PNG_ERROR_NUMBERS_SUPPORTED | |
| 789 if (*warning_message == PNG_LITERAL_SHARP) | |
| 790 { | |
| 791 int offset; | |
| 792 char warning_number[16]; | |
| 793 for (offset = 0; offset < 15; offset++) | |
| 794 { | |
| 795 warning_number[offset] = warning_message[offset + 1]; | |
| 796 if (warning_message[offset] == ' ') | |
| 797 break; | |
| 798 } | |
| 799 | |
| 800 if ((offset > 1) && (offset < 15)) | |
| 801 { | |
| 802 warning_number[offset + 1] = '\0'; | |
| 803 fprintf(stderr, "libpng warning no. %s: %s", | |
| 804 warning_number, warning_message + offset); | |
| 805 fprintf(stderr, PNG_STRING_NEWLINE); | |
| 806 } | |
| 807 | |
| 808 else | |
| 809 { | |
| 810 fprintf(stderr, "libpng warning: %s", | |
| 811 warning_message); | |
| 812 fprintf(stderr, PNG_STRING_NEWLINE); | |
| 813 } | |
| 814 } | |
| 815 else | |
| 816 # endif | |
| 817 | |
| 818 { | |
| 819 fprintf(stderr, "libpng warning: %s", warning_message); | |
| 820 fprintf(stderr, PNG_STRING_NEWLINE); | |
| 821 } | |
| 822 #else | |
| 823 PNG_UNUSED(warning_message) /* Make compiler happy */ | |
| 824 #endif | |
| 825 PNG_UNUSED(png_ptr) /* Make compiler happy */ | |
| 826 } | |
| 827 #endif /* WARNINGS */ | |
| 828 | |
| 829 /* This function is called when the application wants to use another method | |
| 830 * of handling errors and warnings. Note that the error function MUST NOT | |
| 831 * return to the calling routine or serious problems will occur. The return | |
| 832 * method used in the default routine calls longjmp(png_ptr->jmp_buf_ptr, 1) | |
| 833 */ | |
| 834 void PNGAPI | |
| 835 png_set_error_fn(png_structrp png_ptr, png_voidp error_ptr, | |
| 836 png_error_ptr error_fn, png_error_ptr warning_fn) | |
| 837 { | |
| 838 if (png_ptr == NULL) | |
| 839 return; | |
| 840 | |
| 841 png_ptr->error_ptr = error_ptr; | |
| 842 png_ptr->error_fn = error_fn; | |
| 843 #ifdef PNG_WARNINGS_SUPPORTED | |
| 844 png_ptr->warning_fn = warning_fn; | |
| 845 #else | |
| 846 PNG_UNUSED(warning_fn) | |
| 847 #endif | |
| 848 } | |
| 849 | |
| 850 | |
| 851 /* This function returns a pointer to the error_ptr associated with the user | |
| 852 * functions. The application should free any memory associated with this | |
| 853 * pointer before png_write_destroy and png_read_destroy are called. | |
| 854 */ | |
| 855 png_voidp PNGAPI | |
| 856 png_get_error_ptr(png_const_structrp png_ptr) | |
| 857 { | |
| 858 if (png_ptr == NULL) | |
| 859 return NULL; | |
| 860 | |
| 861 return ((png_voidp)png_ptr->error_ptr); | |
| 862 } | |
| 863 | |
| 864 | |
| 865 #ifdef PNG_ERROR_NUMBERS_SUPPORTED | |
| 866 void PNGAPI | |
| 867 png_set_strip_error_numbers(png_structrp png_ptr, png_uint_32 strip_mode) | |
| 868 { | |
| 869 if (png_ptr != NULL) | |
| 870 { | |
| 871 png_ptr->flags &= | |
| 872 ((~(PNG_FLAG_STRIP_ERROR_NUMBERS | | |
| 873 PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode); | |
| 874 } | |
| 875 } | |
| 876 #endif | |
| 877 | |
| 878 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ | |
| 879 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) | |
| 880 /* Currently the above both depend on SETJMP_SUPPORTED, however it would be | |
| 881 * possible to implement without setjmp support just so long as there is some | |
| 882 * way to handle the error return here: | |
| 883 */ | |
| 884 PNG_FUNCTION(void /* PRIVATE */, (PNGCBAPI | |
| 885 png_safe_error),(png_structp png_nonconst_ptr, png_const_charp error_message), | |
| 886 PNG_NORETURN) | |
| 887 { | |
| 888 const png_const_structrp png_ptr = png_nonconst_ptr; | |
| 889 png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr); | |
| 890 | |
| 891 /* An error is always logged here, overwriting anything (typically a warning) | |
| 892 * that is already there: | |
| 893 */ | |
| 894 if (image != NULL) | |
| 895 { | |
| 896 png_safecat(image->message, (sizeof image->message), 0, error_message); | |
| 897 image->warning_or_error |= PNG_IMAGE_ERROR; | |
| 898 | |
| 899 /* Retrieve the jmp_buf from within the png_control, making this work for | |
| 900 * C++ compilation too is pretty tricky: C++ wants a pointer to the first | |
| 901 * element of a jmp_buf, but C doesn't tell us the type of that. | |
| 902 */ | |
| 903 if (image->opaque != NULL && image->opaque->error_buf != NULL) | |
| 904 longjmp(png_control_jmp_buf(image->opaque), 1); | |
| 905 | |
| 906 /* Missing longjmp buffer, the following is to help debugging: */ | |
| 907 { | |
| 908 size_t pos = png_safecat(image->message, (sizeof image->message), 0, | |
| 909 "bad longjmp: "); | |
| 910 png_safecat(image->message, (sizeof image->message), pos, | |
| 911 error_message); | |
| 912 } | |
| 913 } | |
| 914 | |
| 915 /* Here on an internal programming error. */ | |
| 916 abort(); | |
| 917 } | |
| 918 | |
| 919 #ifdef PNG_WARNINGS_SUPPORTED | |
| 920 void /* PRIVATE */ PNGCBAPI | |
| 921 png_safe_warning(png_structp png_nonconst_ptr, png_const_charp warning_message) | |
| 922 { | |
| 923 const png_const_structrp png_ptr = png_nonconst_ptr; | |
| 924 png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr); | |
| 925 | |
| 926 /* A warning is only logged if there is no prior warning or error. */ | |
| 927 if (image->warning_or_error == 0) | |
| 928 { | |
| 929 png_safecat(image->message, (sizeof image->message), 0, warning_message); | |
| 930 image->warning_or_error |= PNG_IMAGE_WARNING; | |
| 931 } | |
| 932 } | |
| 933 #endif | |
| 934 | |
| 935 int /* PRIVATE */ | |
| 936 png_safe_execute(png_imagep image_in, int (*function)(png_voidp), png_voidp arg) | |
| 937 { | |
| 938 volatile png_imagep image = image_in; | |
| 939 volatile int result; | |
| 940 volatile png_voidp saved_error_buf; | |
| 941 jmp_buf safe_jmpbuf; | |
| 942 | |
| 943 /* Safely execute function(arg) with png_error returning to this function. */ | |
| 944 saved_error_buf = image->opaque->error_buf; | |
| 945 result = setjmp(safe_jmpbuf) == 0; | |
| 946 | |
| 947 if (result != 0) | |
| 948 { | |
| 949 | |
| 950 image->opaque->error_buf = safe_jmpbuf; | |
| 951 result = function(arg); | |
| 952 } | |
| 953 | |
| 954 image->opaque->error_buf = saved_error_buf; | |
| 955 | |
| 956 /* And do the cleanup prior to any failure return. */ | |
| 957 if (result == 0) | |
| 958 png_image_free(image); | |
| 959 | |
| 960 return result; | |
| 961 } | |
| 962 #endif /* SIMPLIFIED READ || SIMPLIFIED_WRITE */ | |
| 963 #endif /* READ || WRITE */ | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1599513004:
XFA: Rename libpng to libpng16. (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@xfa