1 2 /* pngset.c - storage of image information into info struct 3 * 4 * Last changed in libpng 1.6.21 [January 15, 2016] 5 * Copyright (c) 1998-2015 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 * The functions here are used during reads to store data from the file 14 * into the info struct, and during writes to store application data 15 * into the info struct for writing into the file. This abstracts the 16 * info struct and allows us to change the structure in the future. 17 */ 18 19 #include "pngpriv.h" 20 21 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) 22 23 #ifdef PNG_bKGD_SUPPORTED 24 void PNGAPI 25 png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr, 26 png_const_color_16p background) 27 { 28 png_debug1(1, "in %s storage function", "bKGD"); 29 30 if (png_ptr == NULL || info_ptr == NULL || background == NULL) 31 return; 32 33 info_ptr->background = *background; 34 info_ptr->valid |= PNG_INFO_bKGD; 35 } 36 #endif 37 38 #ifdef PNG_cHRM_SUPPORTED 39 void PNGFAPI 40 png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr, 41 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, 42 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, 43 png_fixed_point blue_x, png_fixed_point blue_y) 44 { 45 png_xy xy; 46 47 png_debug1(1, "in %s storage function", "cHRM fixed"); 48 49 if (png_ptr == NULL || info_ptr == NULL) 50 return; 51 52 xy.redx = red_x; 53 xy.redy = red_y; 54 xy.greenx = green_x; 55 xy.greeny = green_y; 56 xy.bluex = blue_x; 57 xy.bluey = blue_y; 58 xy.whitex = white_x; 59 xy.whitey = white_y; 60 61 if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy, 62 2/* override with app values*/) != 0) 63 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; 64 65 png_colorspace_sync_info(png_ptr, info_ptr); 66 } 67 68 void PNGFAPI 69 png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr, 70 png_fixed_point int_red_X, png_fixed_point int_red_Y, 71 png_fixed_point int_red_Z, png_fixed_point int_green_X, 72 png_fixed_point int_green_Y, png_fixed_point int_green_Z, 73 png_fixed_point int_blue_X, png_fixed_point int_blue_Y, 74 png_fixed_point int_blue_Z) 75 { 76 png_XYZ XYZ; 77 78 png_debug1(1, "in %s storage function", "cHRM XYZ fixed"); 79 80 if (png_ptr == NULL || info_ptr == NULL) 81 return; 82 83 XYZ.red_X = int_red_X; 84 XYZ.red_Y = int_red_Y; 85 XYZ.red_Z = int_red_Z; 86 XYZ.green_X = int_green_X; 87 XYZ.green_Y = int_green_Y; 88 XYZ.green_Z = int_green_Z; 89 XYZ.blue_X = int_blue_X; 90 XYZ.blue_Y = int_blue_Y; 91 XYZ.blue_Z = int_blue_Z; 92 93 if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace, 94 &XYZ, 2) != 0) 95 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; 96 97 png_colorspace_sync_info(png_ptr, info_ptr); 98 } 99 100 # ifdef PNG_FLOATING_POINT_SUPPORTED 101 void PNGAPI 102 png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, 103 double white_x, double white_y, double red_x, double red_y, 104 double green_x, double green_y, double blue_x, double blue_y) 105 { 106 png_set_cHRM_fixed(png_ptr, info_ptr, 107 png_fixed(png_ptr, white_x, "cHRM White X"), 108 png_fixed(png_ptr, white_y, "cHRM White Y"), 109 png_fixed(png_ptr, red_x, "cHRM Red X"), 110 png_fixed(png_ptr, red_y, "cHRM Red Y"), 111 png_fixed(png_ptr, green_x, "cHRM Green X"), 112 png_fixed(png_ptr, green_y, "cHRM Green Y"), 113 png_fixed(png_ptr, blue_x, "cHRM Blue X"), 114 png_fixed(png_ptr, blue_y, "cHRM Blue Y")); 115 } 116 117 void PNGAPI 118 png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X, 119 double red_Y, double red_Z, double green_X, double green_Y, double green_Z, 120 double blue_X, double blue_Y, double blue_Z) 121 { 122 png_set_cHRM_XYZ_fixed(png_ptr, info_ptr, 123 png_fixed(png_ptr, red_X, "cHRM Red X"), 124 png_fixed(png_ptr, red_Y, "cHRM Red Y"), 125 png_fixed(png_ptr, red_Z, "cHRM Red Z"), 126 png_fixed(png_ptr, green_X, "cHRM Green X"), 127 png_fixed(png_ptr, green_Y, "cHRM Green Y"), 128 png_fixed(png_ptr, green_Z, "cHRM Green Z"), 129 png_fixed(png_ptr, blue_X, "cHRM Blue X"), 130 png_fixed(png_ptr, blue_Y, "cHRM Blue Y"), 131 png_fixed(png_ptr, blue_Z, "cHRM Blue Z")); 132 } 133 # endif /* FLOATING_POINT */ 134 135 #endif /* cHRM */ 136 137 #ifdef PNG_gAMA_SUPPORTED 138 void PNGFAPI 139 png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr, 140 png_fixed_point file_gamma) 141 { 142 png_debug1(1, "in %s storage function", "gAMA"); 143 144 if (png_ptr == NULL || info_ptr == NULL) 145 return; 146 147 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma); 148 png_colorspace_sync_info(png_ptr, info_ptr); 149 } 150 151 # ifdef PNG_FLOATING_POINT_SUPPORTED 152 void PNGAPI 153 png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma) 154 { 155 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma, 156 "png_set_gAMA")); 157 } 158 # endif 159 #endif 160 161 #ifdef PNG_hIST_SUPPORTED 162 void PNGAPI 163 png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr, 164 png_const_uint_16p hist) 165 { 166 int i; 167 168 png_debug1(1, "in %s storage function", "hIST"); 169 170 if (png_ptr == NULL || info_ptr == NULL) 171 return; 172 173 if (info_ptr->num_palette == 0 || info_ptr->num_palette 174 > PNG_MAX_PALETTE_LENGTH) 175 { 176 png_warning(png_ptr, 177 "Invalid palette size, hIST allocation skipped"); 178 179 return; 180 } 181 182 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0); 183 184 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in 185 * version 1.2.1 186 */ 187 info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr, 188 PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16)))); 189 190 if (info_ptr->hist == NULL) 191 { 192 png_warning(png_ptr, "Insufficient memory for hIST chunk data"); 193 194 return; 195 } 196 197 info_ptr->free_me |= PNG_FREE_HIST; 198 199 for (i = 0; i < info_ptr->num_palette; i++) 200 info_ptr->hist[i] = hist[i]; 201 202 info_ptr->valid |= PNG_INFO_hIST; 203 } 204 #endif 205 206 void PNGAPI 207 png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr, 208 png_uint_32 width, png_uint_32 height, int bit_depth, 209 int color_type, int interlace_type, int compression_type, 210 int filter_type) 211 { 212 png_debug1(1, "in %s storage function", "IHDR"); 213 214 if (png_ptr == NULL || info_ptr == NULL) 215 return; 216 217 info_ptr->width = width; 218 info_ptr->height = height; 219 info_ptr->bit_depth = (png_byte)bit_depth; 220 info_ptr->color_type = (png_byte)color_type; 221 info_ptr->compression_type = (png_byte)compression_type; 222 info_ptr->filter_type = (png_byte)filter_type; 223 info_ptr->interlace_type = (png_byte)interlace_type; 224 225 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height, 226 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type, 227 info_ptr->compression_type, info_ptr->filter_type); 228 229 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 230 info_ptr->channels = 1; 231 232 else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0) 233 info_ptr->channels = 3; 234 235 else 236 info_ptr->channels = 1; 237 238 if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0) 239 info_ptr->channels++; 240 241 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth); 242 243 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width); 244 } 245 246 #ifdef PNG_oFFs_SUPPORTED 247 void PNGAPI 248 png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr, 249 png_int_32 offset_x, png_int_32 offset_y, int unit_type) 250 { 251 png_debug1(1, "in %s storage function", "oFFs"); 252 253 if (png_ptr == NULL || info_ptr == NULL) 254 return; 255 256 info_ptr->x_offset = offset_x; 257 info_ptr->y_offset = offset_y; 258 info_ptr->offset_unit_type = (png_byte)unit_type; 259 info_ptr->valid |= PNG_INFO_oFFs; 260 } 261 #endif 262 263 #ifdef PNG_pCAL_SUPPORTED 264 void PNGAPI 265 png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, 266 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, 267 int nparams, png_const_charp units, png_charpp params) 268 { 269 png_size_t length; 270 int i; 271 272 png_debug1(1, "in %s storage function", "pCAL"); 273 274 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL 275 || (nparams > 0 && params == NULL)) 276 return; 277 278 length = strlen(purpose) + 1; 279 png_debug1(3, "allocating purpose for info (%lu bytes)", 280 (unsigned long)length); 281 282 /* TODO: validate format of calibration name and unit name */ 283 284 /* Check that the type matches the specification. */ 285 if (type < 0 || type > 3) 286 png_error(png_ptr, "Invalid pCAL equation type"); 287 288 if (nparams < 0 || nparams > 255) 289 png_error(png_ptr, "Invalid pCAL parameter count"); 290 291 /* Validate params[nparams] */ 292 for (i=0; i<nparams; ++i) 293 { 294 if (params[i] == NULL || 295 !png_check_fp_string(params[i], strlen(params[i]))) 296 png_error(png_ptr, "Invalid format for pCAL parameter"); 297 } 298 299 info_ptr->pcal_purpose = png_voidcast(png_charp, 300 png_malloc_warn(png_ptr, length)); 301 302 if (info_ptr->pcal_purpose == NULL) 303 { 304 png_warning(png_ptr, "Insufficient memory for pCAL purpose"); 305 306 return; 307 } 308 309 memcpy(info_ptr->pcal_purpose, purpose, length); 310 311 png_debug(3, "storing X0, X1, type, and nparams in info"); 312 info_ptr->pcal_X0 = X0; 313 info_ptr->pcal_X1 = X1; 314 info_ptr->pcal_type = (png_byte)type; 315 info_ptr->pcal_nparams = (png_byte)nparams; 316 317 length = strlen(units) + 1; 318 png_debug1(3, "allocating units for info (%lu bytes)", 319 (unsigned long)length); 320 321 info_ptr->pcal_units = png_voidcast(png_charp, 322 png_malloc_warn(png_ptr, length)); 323 324 if (info_ptr->pcal_units == NULL) 325 { 326 png_warning(png_ptr, "Insufficient memory for pCAL units"); 327 328 return; 329 } 330 331 memcpy(info_ptr->pcal_units, units, length); 332 333 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr, 334 (png_size_t)((nparams + 1) * (sizeof (png_charp))))); 335 336 if (info_ptr->pcal_params == NULL) 337 { 338 png_warning(png_ptr, "Insufficient memory for pCAL params"); 339 340 return; 341 } 342 343 memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp))); 344 345 for (i = 0; i < nparams; i++) 346 { 347 length = strlen(params[i]) + 1; 348 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i, 349 (unsigned long)length); 350 351 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length); 352 353 if (info_ptr->pcal_params[i] == NULL) 354 { 355 png_warning(png_ptr, "Insufficient memory for pCAL parameter"); 356 357 return; 358 } 359 360 memcpy(info_ptr->pcal_params[i], params[i], length); 361 } 362 363 info_ptr->valid |= PNG_INFO_pCAL; 364 info_ptr->free_me |= PNG_FREE_PCAL; 365 } 366 #endif 367 368 #ifdef PNG_sCAL_SUPPORTED 369 void PNGAPI 370 png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr, 371 int unit, png_const_charp swidth, png_const_charp sheight) 372 { 373 png_size_t lengthw = 0, lengthh = 0; 374 375 png_debug1(1, "in %s storage function", "sCAL"); 376 377 if (png_ptr == NULL || info_ptr == NULL) 378 return; 379 380 /* Double check the unit (should never get here with an invalid 381 * unit unless this is an API call.) 382 */ 383 if (unit != 1 && unit != 2) 384 png_error(png_ptr, "Invalid sCAL unit"); 385 386 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 || 387 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw)) 388 png_error(png_ptr, "Invalid sCAL width"); 389 390 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 || 391 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh)) 392 png_error(png_ptr, "Invalid sCAL height"); 393 394 info_ptr->scal_unit = (png_byte)unit; 395 396 ++lengthw; 397 398 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw); 399 400 info_ptr->scal_s_width = png_voidcast(png_charp, 401 png_malloc_warn(png_ptr, lengthw)); 402 403 if (info_ptr->scal_s_width == NULL) 404 { 405 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); 406 407 return; 408 } 409 410 memcpy(info_ptr->scal_s_width, swidth, lengthw); 411 412 ++lengthh; 413 414 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh); 415 416 info_ptr->scal_s_height = png_voidcast(png_charp, 417 png_malloc_warn(png_ptr, lengthh)); 418 419 if (info_ptr->scal_s_height == NULL) 420 { 421 png_free (png_ptr, info_ptr->scal_s_width); 422 info_ptr->scal_s_width = NULL; 423 424 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); 425 426 return; 427 } 428 429 memcpy(info_ptr->scal_s_height, sheight, lengthh); 430 431 info_ptr->valid |= PNG_INFO_sCAL; 432 info_ptr->free_me |= PNG_FREE_SCAL; 433 } 434 435 # ifdef PNG_FLOATING_POINT_SUPPORTED 436 void PNGAPI 437 png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit, 438 double width, double height) 439 { 440 png_debug1(1, "in %s storage function", "sCAL"); 441 442 /* Check the arguments. */ 443 if (width <= 0) 444 png_warning(png_ptr, "Invalid sCAL width ignored"); 445 446 else if (height <= 0) 447 png_warning(png_ptr, "Invalid sCAL height ignored"); 448 449 else 450 { 451 /* Convert 'width' and 'height' to ASCII. */ 452 char swidth[PNG_sCAL_MAX_DIGITS+1]; 453 char sheight[PNG_sCAL_MAX_DIGITS+1]; 454 455 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width, 456 PNG_sCAL_PRECISION); 457 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height, 458 PNG_sCAL_PRECISION); 459 460 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); 461 } 462 } 463 # endif 464 465 # ifdef PNG_FIXED_POINT_SUPPORTED 466 void PNGAPI 467 png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit, 468 png_fixed_point width, png_fixed_point height) 469 { 470 png_debug1(1, "in %s storage function", "sCAL"); 471 472 /* Check the arguments. */ 473 if (width <= 0) 474 png_warning(png_ptr, "Invalid sCAL width ignored"); 475 476 else if (height <= 0) 477 png_warning(png_ptr, "Invalid sCAL height ignored"); 478 479 else 480 { 481 /* Convert 'width' and 'height' to ASCII. */ 482 char swidth[PNG_sCAL_MAX_DIGITS+1]; 483 char sheight[PNG_sCAL_MAX_DIGITS+1]; 484 485 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width); 486 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height); 487 488 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); 489 } 490 } 491 # endif 492 #endif 493 494 #ifdef PNG_pHYs_SUPPORTED 495 void PNGAPI 496 png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr, 497 png_uint_32 res_x, png_uint_32 res_y, int unit_type) 498 { 499 png_debug1(1, "in %s storage function", "pHYs"); 500 501 if (png_ptr == NULL || info_ptr == NULL) 502 return; 503 504 info_ptr->x_pixels_per_unit = res_x; 505 info_ptr->y_pixels_per_unit = res_y; 506 info_ptr->phys_unit_type = (png_byte)unit_type; 507 info_ptr->valid |= PNG_INFO_pHYs; 508 } 509 #endif 510 511 void PNGAPI 512 png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr, 513 png_const_colorp palette, int num_palette) 514 { 515 516 png_uint_32 max_palette_length; 517 518 png_debug1(1, "in %s storage function", "PLTE"); 519 520 if (png_ptr == NULL || info_ptr == NULL) 521 return; 522 523 max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ? 524 (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH; 525 526 if (num_palette < 0 || num_palette > (int) max_palette_length) 527 { 528 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 529 png_error(png_ptr, "Invalid palette length"); 530 531 else 532 { 533 png_warning(png_ptr, "Invalid palette length"); 534 535 return; 536 } 537 } 538 539 if ((num_palette > 0 && palette == NULL) || 540 (num_palette == 0 541 # ifdef PNG_MNG_FEATURES_SUPPORTED 542 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 543 # endif 544 )) 545 { 546 png_error(png_ptr, "Invalid palette"); 547 } 548 549 /* It may not actually be necessary to set png_ptr->palette here; 550 * we do it for backward compatibility with the way the png_handle_tRNS 551 * function used to do the allocation. 552 * 553 * 1.6.0: the above statement appears to be incorrect; something has to set 554 * the palette inside png_struct on read. 555 */ 556 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); 557 558 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead 559 * of num_palette entries, in case of an invalid PNG file or incorrect 560 * call to png_set_PLTE() with too-large sample values. 561 */ 562 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr, 563 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)))); 564 565 if (num_palette > 0) 566 memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color))); 567 info_ptr->palette = png_ptr->palette; 568 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; 569 570 info_ptr->free_me |= PNG_FREE_PLTE; 571 572 info_ptr->valid |= PNG_INFO_PLTE; 573 } 574 575 #ifdef PNG_sBIT_SUPPORTED 576 void PNGAPI 577 png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, 578 png_const_color_8p sig_bit) 579 { 580 png_debug1(1, "in %s storage function", "sBIT"); 581 582 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL) 583 return; 584 585 info_ptr->sig_bit = *sig_bit; 586 info_ptr->valid |= PNG_INFO_sBIT; 587 } 588 #endif 589 590 #ifdef PNG_sRGB_SUPPORTED 591 void PNGAPI 592 png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent) 593 { 594 png_debug1(1, "in %s storage function", "sRGB"); 595 596 if (png_ptr == NULL || info_ptr == NULL) 597 return; 598 599 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent); 600 png_colorspace_sync_info(png_ptr, info_ptr); 601 } 602 603 void PNGAPI 604 png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, 605 int srgb_intent) 606 { 607 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM"); 608 609 if (png_ptr == NULL || info_ptr == NULL) 610 return; 611 612 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, 613 srgb_intent) != 0) 614 { 615 /* This causes the gAMA and cHRM to be written too */ 616 info_ptr->colorspace.flags |= 617 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; 618 } 619 620 png_colorspace_sync_info(png_ptr, info_ptr); 621 } 622 #endif /* sRGB */ 623 624 625 #ifdef PNG_iCCP_SUPPORTED 626 void PNGAPI 627 png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr, 628 png_const_charp name, int compression_type, 629 png_const_bytep profile, png_uint_32 proflen) 630 { 631 png_charp new_iccp_name; 632 png_bytep new_iccp_profile; 633 png_size_t length; 634 635 png_debug1(1, "in %s storage function", "iCCP"); 636 637 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL) 638 return; 639 640 if (compression_type != PNG_COMPRESSION_TYPE_BASE) 641 png_app_error(png_ptr, "Invalid iCCP compression method"); 642 643 /* Set the colorspace first because this validates the profile; do not 644 * override previously set app cHRM or gAMA here (because likely as not the 645 * application knows better than libpng what the correct values are.) Pass 646 * the info_ptr color_type field to png_colorspace_set_ICC because in the 647 * write case it has not yet been stored in png_ptr. 648 */ 649 { 650 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name, 651 proflen, profile, info_ptr->color_type); 652 653 png_colorspace_sync_info(png_ptr, info_ptr); 654 655 /* Don't do any of the copying if the profile was bad, or inconsistent. */ 656 if (result == 0) 657 return; 658 659 /* But do write the gAMA and cHRM chunks from the profile. */ 660 info_ptr->colorspace.flags |= 661 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; 662 } 663 664 length = strlen(name)+1; 665 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length)); 666 667 if (new_iccp_name == NULL) 668 { 669 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk"); 670 671 return; 672 } 673 674 memcpy(new_iccp_name, name, length); 675 new_iccp_profile = png_voidcast(png_bytep, 676 png_malloc_warn(png_ptr, proflen)); 677 678 if (new_iccp_profile == NULL) 679 { 680 png_free(png_ptr, new_iccp_name); 681 png_benign_error(png_ptr, 682 "Insufficient memory to process iCCP profile"); 683 684 return; 685 } 686 687 memcpy(new_iccp_profile, profile, proflen); 688 689 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0); 690 691 info_ptr->iccp_proflen = proflen; 692 info_ptr->iccp_name = new_iccp_name; 693 info_ptr->iccp_profile = new_iccp_profile; 694 info_ptr->free_me |= PNG_FREE_ICCP; 695 info_ptr->valid |= PNG_INFO_iCCP; 696 } 697 #endif 698 699 #ifdef PNG_TEXT_SUPPORTED 700 void PNGAPI 701 png_set_text(png_const_structrp png_ptr, png_inforp info_ptr, 702 png_const_textp text_ptr, int num_text) 703 { 704 int ret; 705 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text); 706 707 if (ret != 0) 708 png_error(png_ptr, "Insufficient memory to store text"); 709 } 710 711 int /* PRIVATE */ 712 png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr, 713 png_const_textp text_ptr, int num_text) 714 { 715 int i; 716 717 png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U : 718 (unsigned long)png_ptr->chunk_name); 719 720 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL) 721 return(0); 722 723 /* Make sure we have enough space in the "text" array in info_struct 724 * to hold all of the incoming text_ptr objects. This compare can't overflow 725 * because max_text >= num_text (anyway, subtract of two positive integers 726 * can't overflow in any case.) 727 */ 728 if (num_text > info_ptr->max_text - info_ptr->num_text) 729 { 730 int old_num_text = info_ptr->num_text; 731 int max_text; 732 png_textp new_text = NULL; 733 734 /* Calculate an appropriate max_text, checking for overflow. */ 735 max_text = old_num_text; 736 if (num_text <= INT_MAX - max_text) 737 { 738 max_text += num_text; 739 740 /* Round up to a multiple of 8 */ 741 if (max_text < INT_MAX-8) 742 max_text = (max_text + 8) & ~0x7; 743 744 else 745 max_text = INT_MAX; 746 747 /* Now allocate a new array and copy the old members in; this does all 748 * the overflow checks. 749 */ 750 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr, 751 info_ptr->text, old_num_text, max_text-old_num_text, 752 sizeof *new_text)); 753 } 754 755 if (new_text == NULL) 756 { 757 png_chunk_report(png_ptr, "too many text chunks", 758 PNG_CHUNK_WRITE_ERROR); 759 760 return 1; 761 } 762 763 png_free(png_ptr, info_ptr->text); 764 765 info_ptr->text = new_text; 766 info_ptr->free_me |= PNG_FREE_TEXT; 767 info_ptr->max_text = max_text; 768 /* num_text is adjusted below as the entries are copied in */ 769 770 png_debug1(3, "allocated %d entries for info_ptr->text", max_text); 771 } 772 773 for (i = 0; i < num_text; i++) 774 { 775 size_t text_length, key_len; 776 size_t lang_len, lang_key_len; 777 png_textp textp = &(info_ptr->text[info_ptr->num_text]); 778 779 if (text_ptr[i].key == NULL) 780 continue; 781 782 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE || 783 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST) 784 { 785 png_chunk_report(png_ptr, "text compression mode is out of range", 786 PNG_CHUNK_WRITE_ERROR); 787 continue; 788 } 789 790 key_len = strlen(text_ptr[i].key); 791 792 if (text_ptr[i].compression <= 0) 793 { 794 lang_len = 0; 795 lang_key_len = 0; 796 } 797 798 else 799 # ifdef PNG_iTXt_SUPPORTED 800 { 801 /* Set iTXt data */ 802 803 if (text_ptr[i].lang != NULL) 804 lang_len = strlen(text_ptr[i].lang); 805 806 else 807 lang_len = 0; 808 809 if (text_ptr[i].lang_key != NULL) 810 lang_key_len = strlen(text_ptr[i].lang_key); 811 812 else 813 lang_key_len = 0; 814 } 815 # else /* iTXt */ 816 { 817 png_chunk_report(png_ptr, "iTXt chunk not supported", 818 PNG_CHUNK_WRITE_ERROR); 819 continue; 820 } 821 # endif 822 823 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0') 824 { 825 text_length = 0; 826 # ifdef PNG_iTXt_SUPPORTED 827 if (text_ptr[i].compression > 0) 828 textp->compression = PNG_ITXT_COMPRESSION_NONE; 829 830 else 831 # endif 832 textp->compression = PNG_TEXT_COMPRESSION_NONE; 833 } 834 835 else 836 { 837 text_length = strlen(text_ptr[i].text); 838 textp->compression = text_ptr[i].compression; 839 } 840 841 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr, 842 key_len + text_length + lang_len + lang_key_len + 4)); 843 844 if (textp->key == NULL) 845 { 846 png_chunk_report(png_ptr, "text chunk: out of memory", 847 PNG_CHUNK_WRITE_ERROR); 848 849 return 1; 850 } 851 852 png_debug2(2, "Allocated %lu bytes at %p in png_set_text", 853 (unsigned long)(png_uint_32) 854 (key_len + lang_len + lang_key_len + text_length + 4), 855 textp->key); 856 857 memcpy(textp->key, text_ptr[i].key, key_len); 858 *(textp->key + key_len) = '\0'; 859 860 if (text_ptr[i].compression > 0) 861 { 862 textp->lang = textp->key + key_len + 1; 863 memcpy(textp->lang, text_ptr[i].lang, lang_len); 864 *(textp->lang + lang_len) = '\0'; 865 textp->lang_key = textp->lang + lang_len + 1; 866 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); 867 *(textp->lang_key + lang_key_len) = '\0'; 868 textp->text = textp->lang_key + lang_key_len + 1; 869 } 870 871 else 872 { 873 textp->lang=NULL; 874 textp->lang_key=NULL; 875 textp->text = textp->key + key_len + 1; 876 } 877 878 if (text_length != 0) 879 memcpy(textp->text, text_ptr[i].text, text_length); 880 881 *(textp->text + text_length) = '\0'; 882 883 # ifdef PNG_iTXt_SUPPORTED 884 if (textp->compression > 0) 885 { 886 textp->text_length = 0; 887 textp->itxt_length = text_length; 888 } 889 890 else 891 # endif 892 { 893 textp->text_length = text_length; 894 textp->itxt_length = 0; 895 } 896 897 info_ptr->num_text++; 898 png_debug1(3, "transferred text chunk %d", info_ptr->num_text); 899 } 900 901 return(0); 902 } 903 #endif 904 905 #ifdef PNG_tIME_SUPPORTED 906 void PNGAPI 907 png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr, 908 png_const_timep mod_time) 909 { 910 png_debug1(1, "in %s storage function", "tIME"); 911 912 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL || 913 (png_ptr->mode & PNG_WROTE_tIME) != 0) 914 return; 915 916 if (mod_time->month == 0 || mod_time->month > 12 || 917 mod_time->day == 0 || mod_time->day > 31 || 918 mod_time->hour > 23 || mod_time->minute > 59 || 919 mod_time->second > 60) 920 { 921 png_warning(png_ptr, "Ignoring invalid time value"); 922 923 return; 924 } 925 926 info_ptr->mod_time = *mod_time; 927 info_ptr->valid |= PNG_INFO_tIME; 928 } 929 #endif 930 931 #ifdef PNG_tRNS_SUPPORTED 932 void PNGAPI 933 png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr, 934 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color) 935 { 936 png_debug1(1, "in %s storage function", "tRNS"); 937 938 if (png_ptr == NULL || info_ptr == NULL) 939 940 return; 941 942 if (trans_alpha != NULL) 943 { 944 /* It may not actually be necessary to set png_ptr->trans_alpha here; 945 * we do it for backward compatibility with the way the png_handle_tRNS 946 * function used to do the allocation. 947 * 948 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively 949 * relies on png_set_tRNS storing the information in png_struct 950 * (otherwise it won't be there for the code in pngrtran.c). 951 */ 952 953 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0); 954 955 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */ 956 png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep, 957 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH)); 958 959 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH) 960 memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans); 961 } 962 963 if (trans_color != NULL) 964 { 965 #ifdef PNG_WARNINGS_SUPPORTED 966 if (info_ptr->bit_depth < 16) 967 { 968 int sample_max = (1 << info_ptr->bit_depth) - 1; 969 970 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY && 971 trans_color->gray > sample_max) || 972 (info_ptr->color_type == PNG_COLOR_TYPE_RGB && 973 (trans_color->red > sample_max || 974 trans_color->green > sample_max || 975 trans_color->blue > sample_max))) 976 png_warning(png_ptr, 977 "tRNS chunk has out-of-range samples for bit_depth"); 978 } 979 #endif 980 981 info_ptr->trans_color = *trans_color; 982 983 if (num_trans == 0) 984 num_trans = 1; 985 } 986 987 info_ptr->num_trans = (png_uint_16)num_trans; 988 989 if (num_trans != 0) 990 { 991 info_ptr->valid |= PNG_INFO_tRNS; 992 info_ptr->free_me |= PNG_FREE_TRNS; 993 } 994 } 995 #endif 996 997 #ifdef PNG_sPLT_SUPPORTED 998 void PNGAPI 999 png_set_sPLT(png_const_structrp png_ptr, 1000 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries) 1001 /* 1002 * entries - array of png_sPLT_t structures 1003 * to be added to the list of palettes 1004 * in the info structure. 1005 * 1006 * nentries - number of palette structures to be 1007 * added. 1008 */ 1009 { 1010 png_sPLT_tp np; 1011 1012 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL) 1013 return; 1014 1015 /* Use the internal realloc function, which checks for all the possible 1016 * overflows. Notice that the parameters are (int) and (size_t) 1017 */ 1018 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr, 1019 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries, 1020 sizeof *np)); 1021 1022 if (np == NULL) 1023 { 1024 /* Out of memory or too many chunks */ 1025 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR); 1026 1027 return; 1028 } 1029 1030 png_free(png_ptr, info_ptr->splt_palettes); 1031 info_ptr->splt_palettes = np; 1032 info_ptr->free_me |= PNG_FREE_SPLT; 1033 1034 np += info_ptr->splt_palettes_num; 1035 1036 do 1037 { 1038 png_size_t length; 1039 1040 /* Skip invalid input entries */ 1041 if (entries->name == NULL || entries->entries == NULL) 1042 { 1043 /* png_handle_sPLT doesn't do this, so this is an app error */ 1044 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT"); 1045 /* Just skip the invalid entry */ 1046 continue; 1047 } 1048 1049 np->depth = entries->depth; 1050 1051 /* In the event of out-of-memory just return - there's no point keeping 1052 * on trying to add sPLT chunks. 1053 */ 1054 length = strlen(entries->name) + 1; 1055 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length)); 1056 1057 if (np->name == NULL) 1058 break; 1059 1060 memcpy(np->name, entries->name, length); 1061 1062 /* IMPORTANT: we have memory now that won't get freed if something else 1063 * goes wrong; this code must free it. png_malloc_array produces no 1064 * warnings; use a png_chunk_report (below) if there is an error. 1065 */ 1066 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr, 1067 entries->nentries, sizeof (png_sPLT_entry))); 1068 1069 if (np->entries == NULL) 1070 { 1071 png_free(png_ptr, np->name); 1072 np->name = NULL; 1073 break; 1074 } 1075 1076 np->nentries = entries->nentries; 1077 /* This multiply can't overflow because png_malloc_array has already 1078 * checked it when doing the allocation. 1079 */ 1080 memcpy(np->entries, entries->entries, 1081 entries->nentries * sizeof (png_sPLT_entry)); 1082 1083 /* Note that 'continue' skips the advance of the out pointer and out 1084 * count, so an invalid entry is not added. 1085 */ 1086 info_ptr->valid |= PNG_INFO_sPLT; 1087 ++(info_ptr->splt_palettes_num); 1088 ++np; 1089 } 1090 while (++entries, --nentries); 1091 1092 if (nentries > 0) 1093 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR); 1094 } 1095 #endif /* sPLT */ 1096 1097 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED 1098 static png_byte 1099 check_location(png_const_structrp png_ptr, int location) 1100 { 1101 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT); 1102 1103 /* New in 1.6.0; copy the location and check it. This is an API 1104 * change; previously the app had to use the 1105 * png_set_unknown_chunk_location API below for each chunk. 1106 */ 1107 if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0) 1108 { 1109 /* Write struct, so unknown chunks come from the app */ 1110 png_app_warning(png_ptr, 1111 "png_set_unknown_chunks now expects a valid location"); 1112 /* Use the old behavior */ 1113 location = (png_byte)(png_ptr->mode & 1114 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)); 1115 } 1116 1117 /* This need not be an internal error - if the app calls 1118 * png_set_unknown_chunks on a read pointer it must get the location right. 1119 */ 1120 if (location == 0) 1121 png_error(png_ptr, "invalid location in png_set_unknown_chunks"); 1122 1123 /* Now reduce the location to the top-most set bit by removing each least 1124 * significant bit in turn. 1125 */ 1126 while (location != (location & -location)) 1127 location &= ~(location & -location); 1128 1129 /* The cast is safe because 'location' is a bit mask and only the low four 1130 * bits are significant. 1131 */ 1132 return (png_byte)location; 1133 } 1134 1135 void PNGAPI 1136 png_set_unknown_chunks(png_const_structrp png_ptr, 1137 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns) 1138 { 1139 png_unknown_chunkp np; 1140 1141 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 || 1142 unknowns == NULL) 1143 return; 1144 1145 /* Check for the failure cases where support has been disabled at compile 1146 * time. This code is hardly ever compiled - it's here because 1147 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this 1148 * code) but may be meaningless if the read or write handling of unknown 1149 * chunks is not compiled in. 1150 */ 1151 # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \ 1152 defined(PNG_READ_SUPPORTED) 1153 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0) 1154 { 1155 png_app_error(png_ptr, "no unknown chunk support on read"); 1156 1157 return; 1158 } 1159 # endif 1160 # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \ 1161 defined(PNG_WRITE_SUPPORTED) 1162 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0) 1163 { 1164 png_app_error(png_ptr, "no unknown chunk support on write"); 1165 1166 return; 1167 } 1168 # endif 1169 1170 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that 1171 * unknown critical chunks could be lost with just a warning resulting in 1172 * undefined behavior. Now png_chunk_report is used to provide behavior 1173 * appropriate to read or write. 1174 */ 1175 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr, 1176 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns, 1177 sizeof *np)); 1178 1179 if (np == NULL) 1180 { 1181 png_chunk_report(png_ptr, "too many unknown chunks", 1182 PNG_CHUNK_WRITE_ERROR); 1183 1184 return; 1185 } 1186 1187 png_free(png_ptr, info_ptr->unknown_chunks); 1188 info_ptr->unknown_chunks = np; /* safe because it is initialized */ 1189 info_ptr->free_me |= PNG_FREE_UNKN; 1190 1191 np += info_ptr->unknown_chunks_num; 1192 1193 /* Increment unknown_chunks_num each time round the loop to protect the 1194 * just-allocated chunk data. 1195 */ 1196 for (; num_unknowns > 0; --num_unknowns, ++unknowns) 1197 { 1198 memcpy(np->name, unknowns->name, (sizeof np->name)); 1199 np->name[(sizeof np->name)-1] = '\0'; 1200 np->location = check_location(png_ptr, unknowns->location); 1201 1202 if (unknowns->size == 0) 1203 { 1204 np->data = NULL; 1205 np->size = 0; 1206 } 1207 1208 else 1209 { 1210 np->data = png_voidcast(png_bytep, 1211 png_malloc_base(png_ptr, unknowns->size)); 1212 1213 if (np->data == NULL) 1214 { 1215 png_chunk_report(png_ptr, "unknown chunk: out of memory", 1216 PNG_CHUNK_WRITE_ERROR); 1217 /* But just skip storing the unknown chunk */ 1218 continue; 1219 } 1220 1221 memcpy(np->data, unknowns->data, unknowns->size); 1222 np->size = unknowns->size; 1223 } 1224 1225 /* These increments are skipped on out-of-memory for the data - the 1226 * unknown chunk entry gets overwritten if the png_chunk_report returns. 1227 * This is correct in the read case (the chunk is just dropped.) 1228 */ 1229 ++np; 1230 ++(info_ptr->unknown_chunks_num); 1231 } 1232 } 1233 1234 void PNGAPI 1235 png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr, 1236 int chunk, int location) 1237 { 1238 /* This API is pretty pointless in 1.6.0 because the location can be set 1239 * before the call to png_set_unknown_chunks. 1240 * 1241 * TODO: add a png_app_warning in 1.7 1242 */ 1243 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && 1244 chunk < info_ptr->unknown_chunks_num) 1245 { 1246 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0) 1247 { 1248 png_app_error(png_ptr, "invalid unknown chunk location"); 1249 /* Fake out the pre 1.6.0 behavior: */ 1250 if ((location & PNG_HAVE_IDAT) != 0) /* undocumented! */ 1251 location = PNG_AFTER_IDAT; 1252 1253 else 1254 location = PNG_HAVE_IHDR; /* also undocumented */ 1255 } 1256 1257 info_ptr->unknown_chunks[chunk].location = 1258 check_location(png_ptr, location); 1259 } 1260 } 1261 #endif /* STORE_UNKNOWN_CHUNKS */ 1262 1263 #ifdef PNG_MNG_FEATURES_SUPPORTED 1264 png_uint_32 PNGAPI 1265 png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features) 1266 { 1267 png_debug(1, "in png_permit_mng_features"); 1268 1269 if (png_ptr == NULL) 1270 return 0; 1271 1272 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES; 1273 1274 return png_ptr->mng_features_permitted; 1275 } 1276 #endif 1277 1278 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 1279 static unsigned int 1280 add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep) 1281 { 1282 unsigned int i; 1283 1284 /* Utility function: update the 'keep' state of a chunk if it is already in 1285 * the list, otherwise add it to the list. 1286 */ 1287 for (i=0; i<count; ++i, list += 5) 1288 { 1289 if (memcmp(list, add, 4) == 0) 1290 { 1291 list[4] = (png_byte)keep; 1292 1293 return count; 1294 } 1295 } 1296 1297 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT) 1298 { 1299 ++count; 1300 memcpy(list, add, 4); 1301 list[4] = (png_byte)keep; 1302 } 1303 1304 return count; 1305 } 1306 1307 void PNGAPI 1308 png_set_keep_unknown_chunks(png_structrp png_ptr, int keep, 1309 png_const_bytep chunk_list, int num_chunks_in) 1310 { 1311 png_bytep new_list; 1312 unsigned int num_chunks, old_num_chunks; 1313 1314 if (png_ptr == NULL) 1315 return; 1316 1317 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST) 1318 { 1319 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep"); 1320 1321 return; 1322 } 1323 1324 if (num_chunks_in <= 0) 1325 { 1326 png_ptr->unknown_default = keep; 1327 1328 /* '0' means just set the flags, so stop here */ 1329 if (num_chunks_in == 0) 1330 return; 1331 } 1332 1333 if (num_chunks_in < 0) 1334 { 1335 /* Ignore all unknown chunks and all chunks recognized by 1336 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND 1337 */ 1338 static PNG_CONST png_byte chunks_to_ignore[] = { 1339 98, 75, 71, 68, '\0', /* bKGD */ 1340 99, 72, 82, 77, '\0', /* cHRM */ 1341 103, 65, 77, 65, '\0', /* gAMA */ 1342 104, 73, 83, 84, '\0', /* hIST */ 1343 105, 67, 67, 80, '\0', /* iCCP */ 1344 105, 84, 88, 116, '\0', /* iTXt */ 1345 111, 70, 70, 115, '\0', /* oFFs */ 1346 112, 67, 65, 76, '\0', /* pCAL */ 1347 112, 72, 89, 115, '\0', /* pHYs */ 1348 115, 66, 73, 84, '\0', /* sBIT */ 1349 115, 67, 65, 76, '\0', /* sCAL */ 1350 115, 80, 76, 84, '\0', /* sPLT */ 1351 115, 84, 69, 82, '\0', /* sTER */ 1352 115, 82, 71, 66, '\0', /* sRGB */ 1353 116, 69, 88, 116, '\0', /* tEXt */ 1354 116, 73, 77, 69, '\0', /* tIME */ 1355 122, 84, 88, 116, '\0' /* zTXt */ 1356 }; 1357 1358 chunk_list = chunks_to_ignore; 1359 num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U; 1360 } 1361 1362 else /* num_chunks_in > 0 */ 1363 { 1364 if (chunk_list == NULL) 1365 { 1366 /* Prior to 1.6.0 this was silently ignored, now it is an app_error 1367 * which can be switched off. 1368 */ 1369 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list"); 1370 1371 return; 1372 } 1373 1374 num_chunks = num_chunks_in; 1375 } 1376 1377 old_num_chunks = png_ptr->num_chunk_list; 1378 if (png_ptr->chunk_list == NULL) 1379 old_num_chunks = 0; 1380 1381 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow. 1382 */ 1383 if (num_chunks + old_num_chunks > UINT_MAX/5) 1384 { 1385 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks"); 1386 1387 return; 1388 } 1389 1390 /* If these chunks are being reset to the default then no more memory is 1391 * required because add_one_chunk above doesn't extend the list if the 'keep' 1392 * parameter is the default. 1393 */ 1394 if (keep != 0) 1395 { 1396 new_list = png_voidcast(png_bytep, png_malloc(png_ptr, 1397 5 * (num_chunks + old_num_chunks))); 1398 1399 if (old_num_chunks > 0) 1400 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks); 1401 } 1402 1403 else if (old_num_chunks > 0) 1404 new_list = png_ptr->chunk_list; 1405 1406 else 1407 new_list = NULL; 1408 1409 /* Add the new chunks together with each one's handling code. If the chunk 1410 * already exists the code is updated, otherwise the chunk is added to the 1411 * end. (In libpng 1.6.0 order no longer matters because this code enforces 1412 * the earlier convention that the last setting is the one that is used.) 1413 */ 1414 if (new_list != NULL) 1415 { 1416 png_const_bytep inlist; 1417 png_bytep outlist; 1418 unsigned int i; 1419 1420 for (i=0; i<num_chunks; ++i) 1421 { 1422 old_num_chunks = add_one_chunk(new_list, old_num_chunks, 1423 chunk_list+5*i, keep); 1424 } 1425 1426 /* Now remove any spurious 'default' entries. */ 1427 num_chunks = 0; 1428 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5) 1429 { 1430 if (inlist[4]) 1431 { 1432 if (outlist != inlist) 1433 memcpy(outlist, inlist, 5); 1434 outlist += 5; 1435 ++num_chunks; 1436 } 1437 } 1438 1439 /* This means the application has removed all the specialized handling. */ 1440 if (num_chunks == 0) 1441 { 1442 if (png_ptr->chunk_list != new_list) 1443 png_free(png_ptr, new_list); 1444 1445 new_list = NULL; 1446 } 1447 } 1448 1449 else 1450 num_chunks = 0; 1451 1452 png_ptr->num_chunk_list = num_chunks; 1453 1454 if (png_ptr->chunk_list != new_list) 1455 { 1456 if (png_ptr->chunk_list != NULL) 1457 png_free(png_ptr, png_ptr->chunk_list); 1458 1459 png_ptr->chunk_list = new_list; 1460 } 1461 } 1462 #endif 1463 1464 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED 1465 void PNGAPI 1466 png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr, 1467 png_user_chunk_ptr read_user_chunk_fn) 1468 { 1469 png_debug(1, "in png_set_read_user_chunk_fn"); 1470 1471 if (png_ptr == NULL) 1472 return; 1473 1474 png_ptr->read_user_chunk_fn = read_user_chunk_fn; 1475 png_ptr->user_chunk_ptr = user_chunk_ptr; 1476 } 1477 #endif 1478 1479 #ifdef PNG_INFO_IMAGE_SUPPORTED 1480 void PNGAPI 1481 png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr, 1482 png_bytepp row_pointers) 1483 { 1484 png_debug1(1, "in %s storage function", "rows"); 1485 1486 if (png_ptr == NULL || info_ptr == NULL) 1487 return; 1488 1489 if (info_ptr->row_pointers != NULL && 1490 (info_ptr->row_pointers != row_pointers)) 1491 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); 1492 1493 info_ptr->row_pointers = row_pointers; 1494 1495 if (row_pointers != NULL) 1496 info_ptr->valid |= PNG_INFO_IDAT; 1497 } 1498 #endif 1499 1500 void PNGAPI 1501 png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size) 1502 { 1503 if (png_ptr == NULL) 1504 return; 1505 1506 if (size == 0 || size > PNG_UINT_31_MAX) 1507 png_error(png_ptr, "invalid compression buffer size"); 1508 1509 # ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1510 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0) 1511 { 1512 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */ 1513 return; 1514 } 1515 # endif 1516 1517 # ifdef PNG_WRITE_SUPPORTED 1518 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0) 1519 { 1520 if (png_ptr->zowner != 0) 1521 { 1522 png_warning(png_ptr, 1523 "Compression buffer size cannot be changed because it is in use"); 1524 1525 return; 1526 } 1527 1528 #ifndef __COVERITY__ 1529 /* Some compilers complain that this is always false. However, it 1530 * can be true when integer overflow happens. 1531 */ 1532 if (size > ZLIB_IO_MAX) 1533 { 1534 png_warning(png_ptr, 1535 "Compression buffer size limited to system maximum"); 1536 size = ZLIB_IO_MAX; /* must fit */ 1537 } 1538 #endif 1539 1540 if (size < 6) 1541 { 1542 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH 1543 * if this is permitted. 1544 */ 1545 png_warning(png_ptr, 1546 "Compression buffer size cannot be reduced below 6"); 1547 1548 return; 1549 } 1550 1551 if (png_ptr->zbuffer_size != size) 1552 { 1553 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list); 1554 png_ptr->zbuffer_size = (uInt)size; 1555 } 1556 } 1557 # endif 1558 } 1559 1560 void PNGAPI 1561 png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask) 1562 { 1563 if (png_ptr != NULL && info_ptr != NULL) 1564 info_ptr->valid &= ~mask; 1565 } 1566 1567 1568 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 1569 /* This function was added to libpng 1.2.6 */ 1570 void PNGAPI 1571 png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max, 1572 png_uint_32 user_height_max) 1573 { 1574 /* Images with dimensions larger than these limits will be 1575 * rejected by png_set_IHDR(). To accept any PNG datastream 1576 * regardless of dimensions, set both limits to 0x7fffffff. 1577 */ 1578 if (png_ptr == NULL) 1579 return; 1580 1581 png_ptr->user_width_max = user_width_max; 1582 png_ptr->user_height_max = user_height_max; 1583 } 1584 1585 /* This function was added to libpng 1.4.0 */ 1586 void PNGAPI 1587 png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max) 1588 { 1589 if (png_ptr != NULL) 1590 png_ptr->user_chunk_cache_max = user_chunk_cache_max; 1591 } 1592 1593 /* This function was added to libpng 1.4.1 */ 1594 void PNGAPI 1595 png_set_chunk_malloc_max (png_structrp png_ptr, 1596 png_alloc_size_t user_chunk_malloc_max) 1597 { 1598 if (png_ptr != NULL) 1599 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max; 1600 } 1601 #endif /* ?SET_USER_LIMITS */ 1602 1603 1604 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1605 void PNGAPI 1606 png_set_benign_errors(png_structrp png_ptr, int allowed) 1607 { 1608 png_debug(1, "in png_set_benign_errors"); 1609 1610 /* If allowed is 1, png_benign_error() is treated as a warning. 1611 * 1612 * If allowed is 0, png_benign_error() is treated as an error (which 1613 * is the default behavior if png_set_benign_errors() is not called). 1614 */ 1615 1616 if (allowed != 0) 1617 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN | 1618 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN; 1619 1620 else 1621 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN | 1622 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN); 1623 } 1624 #endif /* BENIGN_ERRORS */ 1625 1626 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED 1627 /* Whether to report invalid palette index; added at libng-1.5.10. 1628 * It is possible for an indexed (color-type==3) PNG file to contain 1629 * pixels with invalid (out-of-range) indexes if the PLTE chunk has 1630 * fewer entries than the image's bit-depth would allow. We recover 1631 * from this gracefully by filling any incomplete palette with zeros 1632 * (opaque black). By default, when this occurs libpng will issue 1633 * a benign error. This API can be used to override that behavior. 1634 */ 1635 void PNGAPI 1636 png_set_check_for_invalid_index(png_structrp png_ptr, int allowed) 1637 { 1638 png_debug(1, "in png_set_check_for_invalid_index"); 1639 1640 if (allowed > 0) 1641 png_ptr->num_palette_max = 0; 1642 1643 else 1644 png_ptr->num_palette_max = -1; 1645 } 1646 #endif 1647 1648 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \ 1649 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 1650 /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification, 1651 * and if invalid, correct the keyword rather than discarding the entire 1652 * chunk. The PNG 1.0 specification requires keywords 1-79 characters in 1653 * length, forbids leading or trailing whitespace, multiple internal spaces, 1654 * and the non-break space (0x80) from ISO 8859-1. Returns keyword length. 1655 * 1656 * The 'new_key' buffer must be 80 characters in size (for the keyword plus a 1657 * trailing '\0'). If this routine returns 0 then there was no keyword, or a 1658 * valid one could not be generated, and the caller must png_error. 1659 */ 1660 png_uint_32 /* PRIVATE */ 1661 png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key) 1662 { 1663 png_const_charp orig_key = key; 1664 png_uint_32 key_len = 0; 1665 int bad_character = 0; 1666 int space = 1; 1667 1668 png_debug(1, "in png_check_keyword"); 1669 1670 if (key == NULL) 1671 { 1672 *new_key = 0; 1673 return 0; 1674 } 1675 1676 while (*key && key_len < 79) 1677 { 1678 png_byte ch = (png_byte)*key++; 1679 1680 if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/)) 1681 *new_key++ = ch, ++key_len, space = 0; 1682 1683 else if (space == 0) 1684 { 1685 /* A space or an invalid character when one wasn't seen immediately 1686 * before; output just a space. 1687 */ 1688 *new_key++ = 32, ++key_len, space = 1; 1689 1690 /* If the character was not a space then it is invalid. */ 1691 if (ch != 32) 1692 bad_character = ch; 1693 } 1694 1695 else if (bad_character == 0) 1696 bad_character = ch; /* just skip it, record the first error */ 1697 } 1698 1699 if (key_len > 0 && space != 0) /* trailing space */ 1700 { 1701 --key_len, --new_key; 1702 if (bad_character == 0) 1703 bad_character = 32; 1704 } 1705 1706 /* Terminate the keyword */ 1707 *new_key = 0; 1708 1709 if (key_len == 0) 1710 return 0; 1711 1712 #ifdef PNG_WARNINGS_SUPPORTED 1713 /* Try to only output one warning per keyword: */ 1714 if (*key != 0) /* keyword too long */ 1715 png_warning(png_ptr, "keyword truncated"); 1716 1717 else if (bad_character != 0) 1718 { 1719 PNG_WARNING_PARAMETERS(p) 1720 1721 png_warning_parameter(p, 1, orig_key); 1722 png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character); 1723 1724 png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'"); 1725 } 1726 #endif /* WARNINGS */ 1727 1728 return key_len; 1729 } 1730 #endif /* TEXT || pCAL || iCCP || sPLT */ 1731 #endif /* READ || WRITE */ 1732
