1 2 /* pngset.c - storage of image information into info struct 3 * 4 * Last changed in libpng 1.6.32 [August 24, 2017] 5 * Copyright (c) 1998-2017 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_eXIf_SUPPORTED 138 void PNGAPI 139 png_set_eXIf(png_const_structrp png_ptr, png_inforp info_ptr, 140 const png_bytep eXIf_buf) 141 { 142 png_warning(png_ptr, "png_set_eXIf does not work; use png_set_eXIf_1"); 143 PNG_UNUSED(info_ptr) 144 PNG_UNUSED(eXIf_buf) 145 } 146 147 void PNGAPI 148 png_set_eXIf_1(png_const_structrp png_ptr, png_inforp info_ptr, 149 const png_uint_32 num_exif, const png_bytep eXIf_buf) 150 { 151 int i; 152 153 png_debug1(1, "in %s storage function", "eXIf"); 154 155 if (png_ptr == NULL || info_ptr == NULL) 156 return; 157 158 if (info_ptr->exif) 159 { 160 png_free(png_ptr, info_ptr->exif); 161 info_ptr->exif = NULL; 162 } 163 164 info_ptr->num_exif = num_exif; 165 166 info_ptr->exif = png_voidcast(png_bytep, png_malloc_warn(png_ptr, 167 info_ptr->num_exif)); 168 169 if (info_ptr->exif == NULL) 170 { 171 png_warning(png_ptr, "Insufficient memory for eXIf chunk data"); 172 return; 173 } 174 175 info_ptr->free_me |= PNG_FREE_EXIF; 176 177 for (i = 0; i < (int) info_ptr->num_exif; i++) 178 info_ptr->exif[i] = eXIf_buf[i]; 179 180 info_ptr->valid |= PNG_INFO_eXIf; 181 } 182 #endif /* eXIf */ 183 184 #ifdef PNG_gAMA_SUPPORTED 185 void PNGFAPI 186 png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr, 187 png_fixed_point file_gamma) 188 { 189 png_debug1(1, "in %s storage function", "gAMA"); 190 191 if (png_ptr == NULL || info_ptr == NULL) 192 return; 193 194 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma); 195 png_colorspace_sync_info(png_ptr, info_ptr); 196 } 197 198 # ifdef PNG_FLOATING_POINT_SUPPORTED 199 void PNGAPI 200 png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma) 201 { 202 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma, 203 "png_set_gAMA")); 204 } 205 # endif 206 #endif 207 208 #ifdef PNG_hIST_SUPPORTED 209 void PNGAPI 210 png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr, 211 png_const_uint_16p hist) 212 { 213 int i; 214 215 png_debug1(1, "in %s storage function", "hIST"); 216 217 if (png_ptr == NULL || info_ptr == NULL) 218 return; 219 220 if (info_ptr->num_palette == 0 || info_ptr->num_palette 221 > PNG_MAX_PALETTE_LENGTH) 222 { 223 png_warning(png_ptr, 224 "Invalid palette size, hIST allocation skipped"); 225 226 return; 227 } 228 229 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0); 230 231 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in 232 * version 1.2.1 233 */ 234 info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr, 235 PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16)))); 236 237 if (info_ptr->hist == NULL) 238 { 239 png_warning(png_ptr, "Insufficient memory for hIST chunk data"); 240 241 return; 242 } 243 244 info_ptr->free_me |= PNG_FREE_HIST; 245 246 for (i = 0; i < info_ptr->num_palette; i++) 247 info_ptr->hist[i] = hist[i]; 248 249 info_ptr->valid |= PNG_INFO_hIST; 250 } 251 #endif 252 253 void PNGAPI 254 png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr, 255 png_uint_32 width, png_uint_32 height, int bit_depth, 256 int color_type, int interlace_type, int compression_type, 257 int filter_type) 258 { 259 png_debug1(1, "in %s storage function", "IHDR"); 260 261 if (png_ptr == NULL || info_ptr == NULL) 262 return; 263 264 info_ptr->width = width; 265 info_ptr->height = height; 266 info_ptr->bit_depth = (png_byte)bit_depth; 267 info_ptr->color_type = (png_byte)color_type; 268 info_ptr->compression_type = (png_byte)compression_type; 269 info_ptr->filter_type = (png_byte)filter_type; 270 info_ptr->interlace_type = (png_byte)interlace_type; 271 272 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height, 273 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type, 274 info_ptr->compression_type, info_ptr->filter_type); 275 276 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 277 info_ptr->channels = 1; 278 279 else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0) 280 info_ptr->channels = 3; 281 282 else 283 info_ptr->channels = 1; 284 285 if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0) 286 info_ptr->channels++; 287 288 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth); 289 290 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width); 291 } 292 293 #ifdef PNG_oFFs_SUPPORTED 294 void PNGAPI 295 png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr, 296 png_int_32 offset_x, png_int_32 offset_y, int unit_type) 297 { 298 png_debug1(1, "in %s storage function", "oFFs"); 299 300 if (png_ptr == NULL || info_ptr == NULL) 301 return; 302 303 info_ptr->x_offset = offset_x; 304 info_ptr->y_offset = offset_y; 305 info_ptr->offset_unit_type = (png_byte)unit_type; 306 info_ptr->valid |= PNG_INFO_oFFs; 307 } 308 #endif 309 310 #ifdef PNG_pCAL_SUPPORTED 311 void PNGAPI 312 png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, 313 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, 314 int nparams, png_const_charp units, png_charpp params) 315 { 316 png_size_t length; 317 int i; 318 319 png_debug1(1, "in %s storage function", "pCAL"); 320 321 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL 322 || (nparams > 0 && params == NULL)) 323 return; 324 325 length = strlen(purpose) + 1; 326 png_debug1(3, "allocating purpose for info (%lu bytes)", 327 (unsigned long)length); 328 329 /* TODO: validate format of calibration name and unit name */ 330 331 /* Check that the type matches the specification. */ 332 if (type < 0 || type > 3) 333 { 334 png_chunk_report(png_ptr, "Invalid pCAL equation type", 335 PNG_CHUNK_WRITE_ERROR); 336 return; 337 } 338 339 if (nparams < 0 || nparams > 255) 340 { 341 png_chunk_report(png_ptr, "Invalid pCAL parameter count", 342 PNG_CHUNK_WRITE_ERROR); 343 return; 344 } 345 346 /* Validate params[nparams] */ 347 for (i=0; i<nparams; ++i) 348 { 349 if (params[i] == NULL || 350 !png_check_fp_string(params[i], strlen(params[i]))) 351 { 352 png_chunk_report(png_ptr, "Invalid format for pCAL parameter", 353 PNG_CHUNK_WRITE_ERROR); 354 return; 355 } 356 } 357 358 info_ptr->pcal_purpose = png_voidcast(png_charp, 359 png_malloc_warn(png_ptr, length)); 360 361 if (info_ptr->pcal_purpose == NULL) 362 { 363 png_chunk_report(png_ptr, "Insufficient memory for pCAL purpose", 364 PNG_CHUNK_WRITE_ERROR); 365 return; 366 } 367 368 memcpy(info_ptr->pcal_purpose, purpose, length); 369 370 png_debug(3, "storing X0, X1, type, and nparams in info"); 371 info_ptr->pcal_X0 = X0; 372 info_ptr->pcal_X1 = X1; 373 info_ptr->pcal_type = (png_byte)type; 374 info_ptr->pcal_nparams = (png_byte)nparams; 375 376 length = strlen(units) + 1; 377 png_debug1(3, "allocating units for info (%lu bytes)", 378 (unsigned long)length); 379 380 info_ptr->pcal_units = png_voidcast(png_charp, 381 png_malloc_warn(png_ptr, length)); 382 383 if (info_ptr->pcal_units == NULL) 384 { 385 png_warning(png_ptr, "Insufficient memory for pCAL units"); 386 387 return; 388 } 389 390 memcpy(info_ptr->pcal_units, units, length); 391 392 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr, 393 (png_size_t)(((unsigned int)nparams + 1) * (sizeof (png_charp))))); 394 395 if (info_ptr->pcal_params == NULL) 396 { 397 png_warning(png_ptr, "Insufficient memory for pCAL params"); 398 399 return; 400 } 401 402 memset(info_ptr->pcal_params, 0, ((unsigned int)nparams + 1) * 403 (sizeof (png_charp))); 404 405 for (i = 0; i < nparams; i++) 406 { 407 length = strlen(params[i]) + 1; 408 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i, 409 (unsigned long)length); 410 411 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length); 412 413 if (info_ptr->pcal_params[i] == NULL) 414 { 415 png_warning(png_ptr, "Insufficient memory for pCAL parameter"); 416 417 return; 418 } 419 420 memcpy(info_ptr->pcal_params[i], params[i], length); 421 } 422 423 info_ptr->valid |= PNG_INFO_pCAL; 424 info_ptr->free_me |= PNG_FREE_PCAL; 425 } 426 #endif 427 428 #ifdef PNG_sCAL_SUPPORTED 429 void PNGAPI 430 png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr, 431 int unit, png_const_charp swidth, png_const_charp sheight) 432 { 433 png_size_t lengthw = 0, lengthh = 0; 434 435 png_debug1(1, "in %s storage function", "sCAL"); 436 437 if (png_ptr == NULL || info_ptr == NULL) 438 return; 439 440 /* Double check the unit (should never get here with an invalid 441 * unit unless this is an API call.) 442 */ 443 if (unit != 1 && unit != 2) 444 png_error(png_ptr, "Invalid sCAL unit"); 445 446 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 || 447 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw)) 448 png_error(png_ptr, "Invalid sCAL width"); 449 450 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 || 451 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh)) 452 png_error(png_ptr, "Invalid sCAL height"); 453 454 info_ptr->scal_unit = (png_byte)unit; 455 456 ++lengthw; 457 458 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw); 459 460 info_ptr->scal_s_width = png_voidcast(png_charp, 461 png_malloc_warn(png_ptr, lengthw)); 462 463 if (info_ptr->scal_s_width == NULL) 464 { 465 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); 466 467 return; 468 } 469 470 memcpy(info_ptr->scal_s_width, swidth, lengthw); 471 472 ++lengthh; 473 474 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh); 475 476 info_ptr->scal_s_height = png_voidcast(png_charp, 477 png_malloc_warn(png_ptr, lengthh)); 478 479 if (info_ptr->scal_s_height == NULL) 480 { 481 png_free (png_ptr, info_ptr->scal_s_width); 482 info_ptr->scal_s_width = NULL; 483 484 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); 485 486 return; 487 } 488 489 memcpy(info_ptr->scal_s_height, sheight, lengthh); 490 491 info_ptr->valid |= PNG_INFO_sCAL; 492 info_ptr->free_me |= PNG_FREE_SCAL; 493 } 494 495 # ifdef PNG_FLOATING_POINT_SUPPORTED 496 void PNGAPI 497 png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit, 498 double width, double height) 499 { 500 png_debug1(1, "in %s storage function", "sCAL"); 501 502 /* Check the arguments. */ 503 if (width <= 0) 504 png_warning(png_ptr, "Invalid sCAL width ignored"); 505 506 else if (height <= 0) 507 png_warning(png_ptr, "Invalid sCAL height ignored"); 508 509 else 510 { 511 /* Convert 'width' and 'height' to ASCII. */ 512 char swidth[PNG_sCAL_MAX_DIGITS+1]; 513 char sheight[PNG_sCAL_MAX_DIGITS+1]; 514 515 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width, 516 PNG_sCAL_PRECISION); 517 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height, 518 PNG_sCAL_PRECISION); 519 520 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); 521 } 522 } 523 # endif 524 525 # ifdef PNG_FIXED_POINT_SUPPORTED 526 void PNGAPI 527 png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit, 528 png_fixed_point width, png_fixed_point height) 529 { 530 png_debug1(1, "in %s storage function", "sCAL"); 531 532 /* Check the arguments. */ 533 if (width <= 0) 534 png_warning(png_ptr, "Invalid sCAL width ignored"); 535 536 else if (height <= 0) 537 png_warning(png_ptr, "Invalid sCAL height ignored"); 538 539 else 540 { 541 /* Convert 'width' and 'height' to ASCII. */ 542 char swidth[PNG_sCAL_MAX_DIGITS+1]; 543 char sheight[PNG_sCAL_MAX_DIGITS+1]; 544 545 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width); 546 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height); 547 548 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); 549 } 550 } 551 # endif 552 #endif 553 554 #ifdef PNG_pHYs_SUPPORTED 555 void PNGAPI 556 png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr, 557 png_uint_32 res_x, png_uint_32 res_y, int unit_type) 558 { 559 png_debug1(1, "in %s storage function", "pHYs"); 560 561 if (png_ptr == NULL || info_ptr == NULL) 562 return; 563 564 info_ptr->x_pixels_per_unit = res_x; 565 info_ptr->y_pixels_per_unit = res_y; 566 info_ptr->phys_unit_type = (png_byte)unit_type; 567 info_ptr->valid |= PNG_INFO_pHYs; 568 } 569 #endif 570 571 void PNGAPI 572 png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr, 573 png_const_colorp palette, int num_palette) 574 { 575 576 png_uint_32 max_palette_length; 577 578 png_debug1(1, "in %s storage function", "PLTE"); 579 580 if (png_ptr == NULL || info_ptr == NULL) 581 return; 582 583 max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ? 584 (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH; 585 586 if (num_palette < 0 || num_palette > (int) max_palette_length) 587 { 588 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 589 png_error(png_ptr, "Invalid palette length"); 590 591 else 592 { 593 png_warning(png_ptr, "Invalid palette length"); 594 595 return; 596 } 597 } 598 599 if ((num_palette > 0 && palette == NULL) || 600 (num_palette == 0 601 # ifdef PNG_MNG_FEATURES_SUPPORTED 602 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 603 # endif 604 )) 605 { 606 png_error(png_ptr, "Invalid palette"); 607 } 608 609 /* It may not actually be necessary to set png_ptr->palette here; 610 * we do it for backward compatibility with the way the png_handle_tRNS 611 * function used to do the allocation. 612 * 613 * 1.6.0: the above statement appears to be incorrect; something has to set 614 * the palette inside png_struct on read. 615 */ 616 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); 617 618 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead 619 * of num_palette entries, in case of an invalid PNG file or incorrect 620 * call to png_set_PLTE() with too-large sample values. 621 */ 622 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr, 623 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)))); 624 625 if (num_palette > 0) 626 memcpy(png_ptr->palette, palette, (unsigned int)num_palette * 627 (sizeof (png_color))); 628 info_ptr->palette = png_ptr->palette; 629 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; 630 631 info_ptr->free_me |= PNG_FREE_PLTE; 632 633 info_ptr->valid |= PNG_INFO_PLTE; 634 } 635 636 #ifdef PNG_sBIT_SUPPORTED 637 void PNGAPI 638 png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, 639 png_const_color_8p sig_bit) 640 { 641 png_debug1(1, "in %s storage function", "sBIT"); 642 643 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL) 644 return; 645 646 info_ptr->sig_bit = *sig_bit; 647 info_ptr->valid |= PNG_INFO_sBIT; 648 } 649 #endif 650 651 #ifdef PNG_sRGB_SUPPORTED 652 void PNGAPI 653 png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent) 654 { 655 png_debug1(1, "in %s storage function", "sRGB"); 656 657 if (png_ptr == NULL || info_ptr == NULL) 658 return; 659 660 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent); 661 png_colorspace_sync_info(png_ptr, info_ptr); 662 } 663 664 void PNGAPI 665 png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, 666 int srgb_intent) 667 { 668 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM"); 669 670 if (png_ptr == NULL || info_ptr == NULL) 671 return; 672 673 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, 674 srgb_intent) != 0) 675 { 676 /* This causes the gAMA and cHRM to be written too */ 677 info_ptr->colorspace.flags |= 678 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; 679 } 680 681 png_colorspace_sync_info(png_ptr, info_ptr); 682 } 683 #endif /* sRGB */ 684 685 686 #ifdef PNG_iCCP_SUPPORTED 687 void PNGAPI 688 png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr, 689 png_const_charp name, int compression_type, 690 png_const_bytep profile, png_uint_32 proflen) 691 { 692 png_charp new_iccp_name; 693 png_bytep new_iccp_profile; 694 png_size_t length; 695 696 png_debug1(1, "in %s storage function", "iCCP"); 697 698 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL) 699 return; 700 701 if (compression_type != PNG_COMPRESSION_TYPE_BASE) 702 png_app_error(png_ptr, "Invalid iCCP compression method"); 703 704 /* Set the colorspace first because this validates the profile; do not 705 * override previously set app cHRM or gAMA here (because likely as not the 706 * application knows better than libpng what the correct values are.) Pass 707 * the info_ptr color_type field to png_colorspace_set_ICC because in the 708 * write case it has not yet been stored in png_ptr. 709 */ 710 { 711 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name, 712 proflen, profile, info_ptr->color_type); 713 714 png_colorspace_sync_info(png_ptr, info_ptr); 715 716 /* Don't do any of the copying if the profile was bad, or inconsistent. */ 717 if (result == 0) 718 return; 719 720 /* But do write the gAMA and cHRM chunks from the profile. */ 721 info_ptr->colorspace.flags |= 722 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; 723 } 724 725 length = strlen(name)+1; 726 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length)); 727 728 if (new_iccp_name == NULL) 729 { 730 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk"); 731 732 return; 733 } 734 735 memcpy(new_iccp_name, name, length); 736 new_iccp_profile = png_voidcast(png_bytep, 737 png_malloc_warn(png_ptr, proflen)); 738 739 if (new_iccp_profile == NULL) 740 { 741 png_free(png_ptr, new_iccp_name); 742 png_benign_error(png_ptr, 743 "Insufficient memory to process iCCP profile"); 744 745 return; 746 } 747 748 memcpy(new_iccp_profile, profile, proflen); 749 750 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0); 751 752 info_ptr->iccp_proflen = proflen; 753 info_ptr->iccp_name = new_iccp_name; 754 info_ptr->iccp_profile = new_iccp_profile; 755 info_ptr->free_me |= PNG_FREE_ICCP; 756 info_ptr->valid |= PNG_INFO_iCCP; 757 } 758 #endif 759 760 #ifdef PNG_TEXT_SUPPORTED 761 void PNGAPI 762 png_set_text(png_const_structrp png_ptr, png_inforp info_ptr, 763 png_const_textp text_ptr, int num_text) 764 { 765 int ret; 766 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text); 767 768 if (ret != 0) 769 png_error(png_ptr, "Insufficient memory to store text"); 770 } 771 772 int /* PRIVATE */ 773 png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr, 774 png_const_textp text_ptr, int num_text) 775 { 776 int i; 777 778 png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U : 779 (unsigned long)png_ptr->chunk_name); 780 781 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL) 782 return(0); 783 784 /* Make sure we have enough space in the "text" array in info_struct 785 * to hold all of the incoming text_ptr objects. This compare can't overflow 786 * because max_text >= num_text (anyway, subtract of two positive integers 787 * can't overflow in any case.) 788 */ 789 if (num_text > info_ptr->max_text - info_ptr->num_text) 790 { 791 int old_num_text = info_ptr->num_text; 792 int max_text; 793 png_textp new_text = NULL; 794 795 /* Calculate an appropriate max_text, checking for overflow. */ 796 max_text = old_num_text; 797 if (num_text <= INT_MAX - max_text) 798 { 799 max_text += num_text; 800 801 /* Round up to a multiple of 8 */ 802 if (max_text < INT_MAX-8) 803 max_text = (max_text + 8) & ~0x7; 804 805 else 806 max_text = INT_MAX; 807 808 /* Now allocate a new array and copy the old members in; this does all 809 * the overflow checks. 810 */ 811 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr, 812 info_ptr->text, old_num_text, max_text-old_num_text, 813 sizeof *new_text)); 814 } 815 816 if (new_text == NULL) 817 { 818 png_chunk_report(png_ptr, "too many text chunks", 819 PNG_CHUNK_WRITE_ERROR); 820 821 return 1; 822 } 823 824 png_free(png_ptr, info_ptr->text); 825 826 info_ptr->text = new_text; 827 info_ptr->free_me |= PNG_FREE_TEXT; 828 info_ptr->max_text = max_text; 829 /* num_text is adjusted below as the entries are copied in */ 830 831 png_debug1(3, "allocated %d entries for info_ptr->text", max_text); 832 } 833 834 for (i = 0; i < num_text; i++) 835 { 836 size_t text_length, key_len; 837 size_t lang_len, lang_key_len; 838 png_textp textp = &(info_ptr->text[info_ptr->num_text]); 839 840 if (text_ptr[i].key == NULL) 841 continue; 842 843 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE || 844 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST) 845 { 846 png_chunk_report(png_ptr, "text compression mode is out of range", 847 PNG_CHUNK_WRITE_ERROR); 848 continue; 849 } 850 851 key_len = strlen(text_ptr[i].key); 852 853 if (text_ptr[i].compression <= 0) 854 { 855 lang_len = 0; 856 lang_key_len = 0; 857 } 858 859 else 860 # ifdef PNG_iTXt_SUPPORTED 861 { 862 /* Set iTXt data */ 863 864 if (text_ptr[i].lang != NULL) 865 lang_len = strlen(text_ptr[i].lang); 866 867 else 868 lang_len = 0; 869 870 if (text_ptr[i].lang_key != NULL) 871 lang_key_len = strlen(text_ptr[i].lang_key); 872 873 else 874 lang_key_len = 0; 875 } 876 # else /* iTXt */ 877 { 878 png_chunk_report(png_ptr, "iTXt chunk not supported", 879 PNG_CHUNK_WRITE_ERROR); 880 continue; 881 } 882 # endif 883 884 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0') 885 { 886 text_length = 0; 887 # ifdef PNG_iTXt_SUPPORTED 888 if (text_ptr[i].compression > 0) 889 textp->compression = PNG_ITXT_COMPRESSION_NONE; 890 891 else 892 # endif 893 textp->compression = PNG_TEXT_COMPRESSION_NONE; 894 } 895 896 else 897 { 898 text_length = strlen(text_ptr[i].text); 899 textp->compression = text_ptr[i].compression; 900 } 901 902 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr, 903 key_len + text_length + lang_len + lang_key_len + 4)); 904 905 if (textp->key == NULL) 906 { 907 png_chunk_report(png_ptr, "text chunk: out of memory", 908 PNG_CHUNK_WRITE_ERROR); 909 910 return 1; 911 } 912 913 png_debug2(2, "Allocated %lu bytes at %p in png_set_text", 914 (unsigned long)(png_uint_32) 915 (key_len + lang_len + lang_key_len + text_length + 4), 916 textp->key); 917 918 memcpy(textp->key, text_ptr[i].key, key_len); 919 *(textp->key + key_len) = '\0'; 920 921 if (text_ptr[i].compression > 0) 922 { 923 textp->lang = textp->key + key_len + 1; 924 memcpy(textp->lang, text_ptr[i].lang, lang_len); 925 *(textp->lang + lang_len) = '\0'; 926 textp->lang_key = textp->lang + lang_len + 1; 927 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); 928 *(textp->lang_key + lang_key_len) = '\0'; 929 textp->text = textp->lang_key + lang_key_len + 1; 930 } 931 932 else 933 { 934 textp->lang=NULL; 935 textp->lang_key=NULL; 936 textp->text = textp->key + key_len + 1; 937 } 938 939 if (text_length != 0) 940 memcpy(textp->text, text_ptr[i].text, text_length); 941 942 *(textp->text + text_length) = '\0'; 943 944 # ifdef PNG_iTXt_SUPPORTED 945 if (textp->compression > 0) 946 { 947 textp->text_length = 0; 948 textp->itxt_length = text_length; 949 } 950 951 else 952 # endif 953 { 954 textp->text_length = text_length; 955 textp->itxt_length = 0; 956 } 957 958 info_ptr->num_text++; 959 png_debug1(3, "transferred text chunk %d", info_ptr->num_text); 960 } 961 962 return(0); 963 } 964 #endif 965 966 #ifdef PNG_tIME_SUPPORTED 967 void PNGAPI 968 png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr, 969 png_const_timep mod_time) 970 { 971 png_debug1(1, "in %s storage function", "tIME"); 972 973 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL || 974 (png_ptr->mode & PNG_WROTE_tIME) != 0) 975 return; 976 977 if (mod_time->month == 0 || mod_time->month > 12 || 978 mod_time->day == 0 || mod_time->day > 31 || 979 mod_time->hour > 23 || mod_time->minute > 59 || 980 mod_time->second > 60) 981 { 982 png_warning(png_ptr, "Ignoring invalid time value"); 983 984 return; 985 } 986 987 info_ptr->mod_time = *mod_time; 988 info_ptr->valid |= PNG_INFO_tIME; 989 } 990 #endif 991 992 #ifdef PNG_tRNS_SUPPORTED 993 void PNGAPI 994 png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr, 995 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color) 996 { 997 png_debug1(1, "in %s storage function", "tRNS"); 998 999 if (png_ptr == NULL || info_ptr == NULL) 1000 1001 return; 1002 1003 if (trans_alpha != NULL) 1004 { 1005 /* It may not actually be necessary to set png_ptr->trans_alpha here; 1006 * we do it for backward compatibility with the way the png_handle_tRNS 1007 * function used to do the allocation. 1008 * 1009 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively 1010 * relies on png_set_tRNS storing the information in png_struct 1011 * (otherwise it won't be there for the code in pngrtran.c). 1012 */ 1013 1014 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0); 1015 1016 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH) 1017 { 1018 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */ 1019 info_ptr->trans_alpha = png_voidcast(png_bytep, 1020 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH)); 1021 memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans); 1022 } 1023 png_ptr->trans_alpha = info_ptr->trans_alpha; 1024 } 1025 1026 if (trans_color != NULL) 1027 { 1028 #ifdef PNG_WARNINGS_SUPPORTED 1029 if (info_ptr->bit_depth < 16) 1030 { 1031 int sample_max = (1 << info_ptr->bit_depth) - 1; 1032 1033 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY && 1034 trans_color->gray > sample_max) || 1035 (info_ptr->color_type == PNG_COLOR_TYPE_RGB && 1036 (trans_color->red > sample_max || 1037 trans_color->green > sample_max || 1038 trans_color->blue > sample_max))) 1039 png_warning(png_ptr, 1040 "tRNS chunk has out-of-range samples for bit_depth"); 1041 } 1042 #endif 1043 1044 info_ptr->trans_color = *trans_color; 1045 1046 if (num_trans == 0) 1047 num_trans = 1; 1048 } 1049 1050 info_ptr->num_trans = (png_uint_16)num_trans; 1051 1052 if (num_trans != 0) 1053 { 1054 info_ptr->valid |= PNG_INFO_tRNS; 1055 info_ptr->free_me |= PNG_FREE_TRNS; 1056 } 1057 } 1058 #endif 1059 1060 #ifdef PNG_sPLT_SUPPORTED 1061 void PNGAPI 1062 png_set_sPLT(png_const_structrp png_ptr, 1063 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries) 1064 /* 1065 * entries - array of png_sPLT_t structures 1066 * to be added to the list of palettes 1067 * in the info structure. 1068 * 1069 * nentries - number of palette structures to be 1070 * added. 1071 */ 1072 { 1073 png_sPLT_tp np; 1074 1075 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL) 1076 return; 1077 1078 /* Use the internal realloc function, which checks for all the possible 1079 * overflows. Notice that the parameters are (int) and (size_t) 1080 */ 1081 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr, 1082 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries, 1083 sizeof *np)); 1084 1085 if (np == NULL) 1086 { 1087 /* Out of memory or too many chunks */ 1088 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR); 1089 1090 return; 1091 } 1092 1093 png_free(png_ptr, info_ptr->splt_palettes); 1094 info_ptr->splt_palettes = np; 1095 info_ptr->free_me |= PNG_FREE_SPLT; 1096 1097 np += info_ptr->splt_palettes_num; 1098 1099 do 1100 { 1101 png_size_t length; 1102 1103 /* Skip invalid input entries */ 1104 if (entries->name == NULL || entries->entries == NULL) 1105 { 1106 /* png_handle_sPLT doesn't do this, so this is an app error */ 1107 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT"); 1108 /* Just skip the invalid entry */ 1109 continue; 1110 } 1111 1112 np->depth = entries->depth; 1113 1114 /* In the event of out-of-memory just return - there's no point keeping 1115 * on trying to add sPLT chunks. 1116 */ 1117 length = strlen(entries->name) + 1; 1118 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length)); 1119 1120 if (np->name == NULL) 1121 break; 1122 1123 memcpy(np->name, entries->name, length); 1124 1125 /* IMPORTANT: we have memory now that won't get freed if something else 1126 * goes wrong; this code must free it. png_malloc_array produces no 1127 * warnings; use a png_chunk_report (below) if there is an error. 1128 */ 1129 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr, 1130 entries->nentries, sizeof (png_sPLT_entry))); 1131 1132 if (np->entries == NULL) 1133 { 1134 png_free(png_ptr, np->name); 1135 np->name = NULL; 1136 break; 1137 } 1138 1139 np->nentries = entries->nentries; 1140 /* This multiply can't overflow because png_malloc_array has already 1141 * checked it when doing the allocation. 1142 */ 1143 memcpy(np->entries, entries->entries, 1144 (unsigned int)entries->nentries * sizeof (png_sPLT_entry)); 1145 1146 /* Note that 'continue' skips the advance of the out pointer and out 1147 * count, so an invalid entry is not added. 1148 */ 1149 info_ptr->valid |= PNG_INFO_sPLT; 1150 ++(info_ptr->splt_palettes_num); 1151 ++np; 1152 ++entries; 1153 } 1154 while (--nentries); 1155 1156 if (nentries > 0) 1157 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR); 1158 } 1159 #endif /* sPLT */ 1160 1161 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED 1162 static png_byte 1163 check_location(png_const_structrp png_ptr, int location) 1164 { 1165 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT); 1166 1167 /* New in 1.6.0; copy the location and check it. This is an API 1168 * change; previously the app had to use the 1169 * png_set_unknown_chunk_location API below for each chunk. 1170 */ 1171 if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0) 1172 { 1173 /* Write struct, so unknown chunks come from the app */ 1174 png_app_warning(png_ptr, 1175 "png_set_unknown_chunks now expects a valid location"); 1176 /* Use the old behavior */ 1177 location = (png_byte)(png_ptr->mode & 1178 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)); 1179 } 1180 1181 /* This need not be an internal error - if the app calls 1182 * png_set_unknown_chunks on a read pointer it must get the location right. 1183 */ 1184 if (location == 0) 1185 png_error(png_ptr, "invalid location in png_set_unknown_chunks"); 1186 1187 /* Now reduce the location to the top-most set bit by removing each least 1188 * significant bit in turn. 1189 */ 1190 while (location != (location & -location)) 1191 location &= ~(location & -location); 1192 1193 /* The cast is safe because 'location' is a bit mask and only the low four 1194 * bits are significant. 1195 */ 1196 return (png_byte)location; 1197 } 1198 1199 void PNGAPI 1200 png_set_unknown_chunks(png_const_structrp png_ptr, 1201 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns) 1202 { 1203 png_unknown_chunkp np; 1204 1205 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 || 1206 unknowns == NULL) 1207 return; 1208 1209 /* Check for the failure cases where support has been disabled at compile 1210 * time. This code is hardly ever compiled - it's here because 1211 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this 1212 * code) but may be meaningless if the read or write handling of unknown 1213 * chunks is not compiled in. 1214 */ 1215 # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \ 1216 defined(PNG_READ_SUPPORTED) 1217 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0) 1218 { 1219 png_app_error(png_ptr, "no unknown chunk support on read"); 1220 1221 return; 1222 } 1223 # endif 1224 # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \ 1225 defined(PNG_WRITE_SUPPORTED) 1226 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0) 1227 { 1228 png_app_error(png_ptr, "no unknown chunk support on write"); 1229 1230 return; 1231 } 1232 # endif 1233 1234 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that 1235 * unknown critical chunks could be lost with just a warning resulting in 1236 * undefined behavior. Now png_chunk_report is used to provide behavior 1237 * appropriate to read or write. 1238 */ 1239 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr, 1240 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns, 1241 sizeof *np)); 1242 1243 if (np == NULL) 1244 { 1245 png_chunk_report(png_ptr, "too many unknown chunks", 1246 PNG_CHUNK_WRITE_ERROR); 1247 1248 return; 1249 } 1250 1251 png_free(png_ptr, info_ptr->unknown_chunks); 1252 info_ptr->unknown_chunks = np; /* safe because it is initialized */ 1253 info_ptr->free_me |= PNG_FREE_UNKN; 1254 1255 np += info_ptr->unknown_chunks_num; 1256 1257 /* Increment unknown_chunks_num each time round the loop to protect the 1258 * just-allocated chunk data. 1259 */ 1260 for (; num_unknowns > 0; --num_unknowns, ++unknowns) 1261 { 1262 memcpy(np->name, unknowns->name, (sizeof np->name)); 1263 np->name[(sizeof np->name)-1] = '\0'; 1264 np->location = check_location(png_ptr, unknowns->location); 1265 1266 if (unknowns->size == 0) 1267 { 1268 np->data = NULL; 1269 np->size = 0; 1270 } 1271 1272 else 1273 { 1274 np->data = png_voidcast(png_bytep, 1275 png_malloc_base(png_ptr, unknowns->size)); 1276 1277 if (np->data == NULL) 1278 { 1279 png_chunk_report(png_ptr, "unknown chunk: out of memory", 1280 PNG_CHUNK_WRITE_ERROR); 1281 /* But just skip storing the unknown chunk */ 1282 continue; 1283 } 1284 1285 memcpy(np->data, unknowns->data, unknowns->size); 1286 np->size = unknowns->size; 1287 } 1288 1289 /* These increments are skipped on out-of-memory for the data - the 1290 * unknown chunk entry gets overwritten if the png_chunk_report returns. 1291 * This is correct in the read case (the chunk is just dropped.) 1292 */ 1293 ++np; 1294 ++(info_ptr->unknown_chunks_num); 1295 } 1296 } 1297 1298 void PNGAPI 1299 png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr, 1300 int chunk, int location) 1301 { 1302 /* This API is pretty pointless in 1.6.0 because the location can be set 1303 * before the call to png_set_unknown_chunks. 1304 * 1305 * TODO: add a png_app_warning in 1.7 1306 */ 1307 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && 1308 chunk < info_ptr->unknown_chunks_num) 1309 { 1310 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0) 1311 { 1312 png_app_error(png_ptr, "invalid unknown chunk location"); 1313 /* Fake out the pre 1.6.0 behavior: */ 1314 if (((unsigned int)location & PNG_HAVE_IDAT) != 0) /* undocumented! */ 1315 location = PNG_AFTER_IDAT; 1316 1317 else 1318 location = PNG_HAVE_IHDR; /* also undocumented */ 1319 } 1320 1321 info_ptr->unknown_chunks[chunk].location = 1322 check_location(png_ptr, location); 1323 } 1324 } 1325 #endif /* STORE_UNKNOWN_CHUNKS */ 1326 1327 #ifdef PNG_MNG_FEATURES_SUPPORTED 1328 png_uint_32 PNGAPI 1329 png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features) 1330 { 1331 png_debug(1, "in png_permit_mng_features"); 1332 1333 if (png_ptr == NULL) 1334 return 0; 1335 1336 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES; 1337 1338 return png_ptr->mng_features_permitted; 1339 } 1340 #endif 1341 1342 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 1343 static unsigned int 1344 add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep) 1345 { 1346 unsigned int i; 1347 1348 /* Utility function: update the 'keep' state of a chunk if it is already in 1349 * the list, otherwise add it to the list. 1350 */ 1351 for (i=0; i<count; ++i, list += 5) 1352 { 1353 if (memcmp(list, add, 4) == 0) 1354 { 1355 list[4] = (png_byte)keep; 1356 1357 return count; 1358 } 1359 } 1360 1361 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT) 1362 { 1363 ++count; 1364 memcpy(list, add, 4); 1365 list[4] = (png_byte)keep; 1366 } 1367 1368 return count; 1369 } 1370 1371 void PNGAPI 1372 png_set_keep_unknown_chunks(png_structrp png_ptr, int keep, 1373 png_const_bytep chunk_list, int num_chunks_in) 1374 { 1375 png_bytep new_list; 1376 unsigned int num_chunks, old_num_chunks; 1377 1378 if (png_ptr == NULL) 1379 return; 1380 1381 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST) 1382 { 1383 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep"); 1384 1385 return; 1386 } 1387 1388 if (num_chunks_in <= 0) 1389 { 1390 png_ptr->unknown_default = keep; 1391 1392 /* '0' means just set the flags, so stop here */ 1393 if (num_chunks_in == 0) 1394 return; 1395 } 1396 1397 if (num_chunks_in < 0) 1398 { 1399 /* Ignore all unknown chunks and all chunks recognized by 1400 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND 1401 */ 1402 static PNG_CONST png_byte chunks_to_ignore[] = { 1403 98, 75, 71, 68, '\0', /* bKGD */ 1404 99, 72, 82, 77, '\0', /* cHRM */ 1405 101, 88, 73, 102, '\0', /* eXIf */ 1406 103, 65, 77, 65, '\0', /* gAMA */ 1407 104, 73, 83, 84, '\0', /* hIST */ 1408 105, 67, 67, 80, '\0', /* iCCP */ 1409 105, 84, 88, 116, '\0', /* iTXt */ 1410 111, 70, 70, 115, '\0', /* oFFs */ 1411 112, 67, 65, 76, '\0', /* pCAL */ 1412 112, 72, 89, 115, '\0', /* pHYs */ 1413 115, 66, 73, 84, '\0', /* sBIT */ 1414 115, 67, 65, 76, '\0', /* sCAL */ 1415 115, 80, 76, 84, '\0', /* sPLT */ 1416 115, 84, 69, 82, '\0', /* sTER */ 1417 115, 82, 71, 66, '\0', /* sRGB */ 1418 116, 69, 88, 116, '\0', /* tEXt */ 1419 116, 73, 77, 69, '\0', /* tIME */ 1420 122, 84, 88, 116, '\0' /* zTXt */ 1421 }; 1422 1423 chunk_list = chunks_to_ignore; 1424 num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U; 1425 } 1426 1427 else /* num_chunks_in > 0 */ 1428 { 1429 if (chunk_list == NULL) 1430 { 1431 /* Prior to 1.6.0 this was silently ignored, now it is an app_error 1432 * which can be switched off. 1433 */ 1434 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list"); 1435 1436 return; 1437 } 1438 1439 num_chunks = (unsigned int)num_chunks_in; 1440 } 1441 1442 old_num_chunks = png_ptr->num_chunk_list; 1443 if (png_ptr->chunk_list == NULL) 1444 old_num_chunks = 0; 1445 1446 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow. 1447 */ 1448 if (num_chunks + old_num_chunks > UINT_MAX/5) 1449 { 1450 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks"); 1451 1452 return; 1453 } 1454 1455 /* If these chunks are being reset to the default then no more memory is 1456 * required because add_one_chunk above doesn't extend the list if the 'keep' 1457 * parameter is the default. 1458 */ 1459 if (keep != 0) 1460 { 1461 new_list = png_voidcast(png_bytep, png_malloc(png_ptr, 1462 5 * (num_chunks + old_num_chunks))); 1463 1464 if (old_num_chunks > 0) 1465 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks); 1466 } 1467 1468 else if (old_num_chunks > 0) 1469 new_list = png_ptr->chunk_list; 1470 1471 else 1472 new_list = NULL; 1473 1474 /* Add the new chunks together with each one's handling code. If the chunk 1475 * already exists the code is updated, otherwise the chunk is added to the 1476 * end. (In libpng 1.6.0 order no longer matters because this code enforces 1477 * the earlier convention that the last setting is the one that is used.) 1478 */ 1479 if (new_list != NULL) 1480 { 1481 png_const_bytep inlist; 1482 png_bytep outlist; 1483 unsigned int i; 1484 1485 for (i=0; i<num_chunks; ++i) 1486 { 1487 old_num_chunks = add_one_chunk(new_list, old_num_chunks, 1488 chunk_list+5*i, keep); 1489 } 1490 1491 /* Now remove any spurious 'default' entries. */ 1492 num_chunks = 0; 1493 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5) 1494 { 1495 if (inlist[4]) 1496 { 1497 if (outlist != inlist) 1498 memcpy(outlist, inlist, 5); 1499 outlist += 5; 1500 ++num_chunks; 1501 } 1502 } 1503 1504 /* This means the application has removed all the specialized handling. */ 1505 if (num_chunks == 0) 1506 { 1507 if (png_ptr->chunk_list != new_list) 1508 png_free(png_ptr, new_list); 1509 1510 new_list = NULL; 1511 } 1512 } 1513 1514 else 1515 num_chunks = 0; 1516 1517 png_ptr->num_chunk_list = num_chunks; 1518 1519 if (png_ptr->chunk_list != new_list) 1520 { 1521 if (png_ptr->chunk_list != NULL) 1522 png_free(png_ptr, png_ptr->chunk_list); 1523 1524 png_ptr->chunk_list = new_list; 1525 } 1526 } 1527 #endif 1528 1529 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED 1530 void PNGAPI 1531 png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr, 1532 png_user_chunk_ptr read_user_chunk_fn) 1533 { 1534 png_debug(1, "in png_set_read_user_chunk_fn"); 1535 1536 if (png_ptr == NULL) 1537 return; 1538 1539 png_ptr->read_user_chunk_fn = read_user_chunk_fn; 1540 png_ptr->user_chunk_ptr = user_chunk_ptr; 1541 } 1542 #endif 1543 1544 #ifdef PNG_INFO_IMAGE_SUPPORTED 1545 void PNGAPI 1546 png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr, 1547 png_bytepp row_pointers) 1548 { 1549 png_debug1(1, "in %s storage function", "rows"); 1550 1551 if (png_ptr == NULL || info_ptr == NULL) 1552 return; 1553 1554 if (info_ptr->row_pointers != NULL && 1555 (info_ptr->row_pointers != row_pointers)) 1556 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); 1557 1558 info_ptr->row_pointers = row_pointers; 1559 1560 if (row_pointers != NULL) 1561 info_ptr->valid |= PNG_INFO_IDAT; 1562 } 1563 #endif 1564 1565 void PNGAPI 1566 png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size) 1567 { 1568 if (png_ptr == NULL) 1569 return; 1570 1571 if (size == 0 || size > PNG_UINT_31_MAX) 1572 png_error(png_ptr, "invalid compression buffer size"); 1573 1574 # ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1575 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0) 1576 { 1577 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */ 1578 return; 1579 } 1580 # endif 1581 1582 # ifdef PNG_WRITE_SUPPORTED 1583 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0) 1584 { 1585 if (png_ptr->zowner != 0) 1586 { 1587 png_warning(png_ptr, 1588 "Compression buffer size cannot be changed because it is in use"); 1589 1590 return; 1591 } 1592 1593 #ifndef __COVERITY__ 1594 /* Some compilers complain that this is always false. However, it 1595 * can be true when integer overflow happens. 1596 */ 1597 if (size > ZLIB_IO_MAX) 1598 { 1599 png_warning(png_ptr, 1600 "Compression buffer size limited to system maximum"); 1601 size = ZLIB_IO_MAX; /* must fit */ 1602 } 1603 #endif 1604 1605 if (size < 6) 1606 { 1607 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH 1608 * if this is permitted. 1609 */ 1610 png_warning(png_ptr, 1611 "Compression buffer size cannot be reduced below 6"); 1612 1613 return; 1614 } 1615 1616 if (png_ptr->zbuffer_size != size) 1617 { 1618 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list); 1619 png_ptr->zbuffer_size = (uInt)size; 1620 } 1621 } 1622 # endif 1623 } 1624 1625 void PNGAPI 1626 png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask) 1627 { 1628 if (png_ptr != NULL && info_ptr != NULL) 1629 info_ptr->valid &= (unsigned int)(~mask); 1630 } 1631 1632 1633 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 1634 /* This function was added to libpng 1.2.6 */ 1635 void PNGAPI 1636 png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max, 1637 png_uint_32 user_height_max) 1638 { 1639 /* Images with dimensions larger than these limits will be 1640 * rejected by png_set_IHDR(). To accept any PNG datastream 1641 * regardless of dimensions, set both limits to 0x7fffffff. 1642 */ 1643 if (png_ptr == NULL) 1644 return; 1645 1646 png_ptr->user_width_max = user_width_max; 1647 png_ptr->user_height_max = user_height_max; 1648 } 1649 1650 /* This function was added to libpng 1.4.0 */ 1651 void PNGAPI 1652 png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max) 1653 { 1654 if (png_ptr != NULL) 1655 png_ptr->user_chunk_cache_max = user_chunk_cache_max; 1656 } 1657 1658 /* This function was added to libpng 1.4.1 */ 1659 void PNGAPI 1660 png_set_chunk_malloc_max (png_structrp png_ptr, 1661 png_alloc_size_t user_chunk_malloc_max) 1662 { 1663 if (png_ptr != NULL) 1664 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max; 1665 } 1666 #endif /* ?SET_USER_LIMITS */ 1667 1668 1669 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1670 void PNGAPI 1671 png_set_benign_errors(png_structrp png_ptr, int allowed) 1672 { 1673 png_debug(1, "in png_set_benign_errors"); 1674 1675 /* If allowed is 1, png_benign_error() is treated as a warning. 1676 * 1677 * If allowed is 0, png_benign_error() is treated as an error (which 1678 * is the default behavior if png_set_benign_errors() is not called). 1679 */ 1680 1681 if (allowed != 0) 1682 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN | 1683 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN; 1684 1685 else 1686 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN | 1687 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN); 1688 } 1689 #endif /* BENIGN_ERRORS */ 1690 1691 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED 1692 /* Whether to report invalid palette index; added at libng-1.5.10. 1693 * It is possible for an indexed (color-type==3) PNG file to contain 1694 * pixels with invalid (out-of-range) indexes if the PLTE chunk has 1695 * fewer entries than the image's bit-depth would allow. We recover 1696 * from this gracefully by filling any incomplete palette with zeros 1697 * (opaque black). By default, when this occurs libpng will issue 1698 * a benign error. This API can be used to override that behavior. 1699 */ 1700 void PNGAPI 1701 png_set_check_for_invalid_index(png_structrp png_ptr, int allowed) 1702 { 1703 png_debug(1, "in png_set_check_for_invalid_index"); 1704 1705 if (allowed > 0) 1706 png_ptr->num_palette_max = 0; 1707 1708 else 1709 png_ptr->num_palette_max = -1; 1710 } 1711 #endif 1712 1713 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \ 1714 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 1715 /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification, 1716 * and if invalid, correct the keyword rather than discarding the entire 1717 * chunk. The PNG 1.0 specification requires keywords 1-79 characters in 1718 * length, forbids leading or trailing whitespace, multiple internal spaces, 1719 * and the non-break space (0x80) from ISO 8859-1. Returns keyword length. 1720 * 1721 * The 'new_key' buffer must be 80 characters in size (for the keyword plus a 1722 * trailing '\0'). If this routine returns 0 then there was no keyword, or a 1723 * valid one could not be generated, and the caller must png_error. 1724 */ 1725 png_uint_32 /* PRIVATE */ 1726 png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key) 1727 { 1728 #ifdef PNG_WARNINGS_SUPPORTED 1729 png_const_charp orig_key = key; 1730 #endif 1731 png_uint_32 key_len = 0; 1732 int bad_character = 0; 1733 int space = 1; 1734 1735 png_debug(1, "in png_check_keyword"); 1736 1737 if (key == NULL) 1738 { 1739 *new_key = 0; 1740 return 0; 1741 } 1742 1743 while (*key && key_len < 79) 1744 { 1745 png_byte ch = (png_byte)*key++; 1746 1747 if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/)) 1748 { 1749 *new_key++ = ch; ++key_len; space = 0; 1750 } 1751 1752 else if (space == 0) 1753 { 1754 /* A space or an invalid character when one wasn't seen immediately 1755 * before; output just a space. 1756 */ 1757 *new_key++ = 32; ++key_len; space = 1; 1758 1759 /* If the character was not a space then it is invalid. */ 1760 if (ch != 32) 1761 bad_character = ch; 1762 } 1763 1764 else if (bad_character == 0) 1765 bad_character = ch; /* just skip it, record the first error */ 1766 } 1767 1768 if (key_len > 0 && space != 0) /* trailing space */ 1769 { 1770 --key_len; --new_key; 1771 if (bad_character == 0) 1772 bad_character = 32; 1773 } 1774 1775 /* Terminate the keyword */ 1776 *new_key = 0; 1777 1778 if (key_len == 0) 1779 return 0; 1780 1781 #ifdef PNG_WARNINGS_SUPPORTED 1782 /* Try to only output one warning per keyword: */ 1783 if (*key != 0) /* keyword too long */ 1784 png_warning(png_ptr, "keyword truncated"); 1785 1786 else if (bad_character != 0) 1787 { 1788 PNG_WARNING_PARAMETERS(p) 1789 1790 png_warning_parameter(p, 1, orig_key); 1791 png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character); 1792 1793 png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'"); 1794 } 1795 #else /* !WARNINGS */ 1796 PNG_UNUSED(png_ptr) 1797 #endif /* !WARNINGS */ 1798 1799 return key_len; 1800 } 1801 #endif /* TEXT || pCAL || iCCP || sPLT */ 1802 #endif /* READ || WRITE */ 1803
