1 2/* pngset.c - storage of image information into info struct 3 * 4 * Last changed in libpng 1.6.8 [December 19, 2013] 5 * Copyright (c) 1998-2013 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 24void PNGAPI 25png_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 39void PNGFAPI 40png_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*/)) 63 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; 64 65 png_colorspace_sync_info(png_ptr, info_ptr); 66} 67 68void PNGFAPI 69png_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, &XYZ, 2)) 94 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; 95 96 png_colorspace_sync_info(png_ptr, info_ptr); 97} 98 99# ifdef PNG_FLOATING_POINT_SUPPORTED 100void PNGAPI 101png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, 102 double white_x, double white_y, double red_x, double red_y, 103 double green_x, double green_y, double blue_x, double blue_y) 104{ 105 png_set_cHRM_fixed(png_ptr, info_ptr, 106 png_fixed(png_ptr, white_x, "cHRM White X"), 107 png_fixed(png_ptr, white_y, "cHRM White Y"), 108 png_fixed(png_ptr, red_x, "cHRM Red X"), 109 png_fixed(png_ptr, red_y, "cHRM Red Y"), 110 png_fixed(png_ptr, green_x, "cHRM Green X"), 111 png_fixed(png_ptr, green_y, "cHRM Green Y"), 112 png_fixed(png_ptr, blue_x, "cHRM Blue X"), 113 png_fixed(png_ptr, blue_y, "cHRM Blue Y")); 114} 115 116void PNGAPI 117png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X, 118 double red_Y, double red_Z, double green_X, double green_Y, double green_Z, 119 double blue_X, double blue_Y, double blue_Z) 120{ 121 png_set_cHRM_XYZ_fixed(png_ptr, info_ptr, 122 png_fixed(png_ptr, red_X, "cHRM Red X"), 123 png_fixed(png_ptr, red_Y, "cHRM Red Y"), 124 png_fixed(png_ptr, red_Z, "cHRM Red Z"), 125 png_fixed(png_ptr, green_X, "cHRM Red X"), 126 png_fixed(png_ptr, green_Y, "cHRM Red Y"), 127 png_fixed(png_ptr, green_Z, "cHRM Red Z"), 128 png_fixed(png_ptr, blue_X, "cHRM Red X"), 129 png_fixed(png_ptr, blue_Y, "cHRM Red Y"), 130 png_fixed(png_ptr, blue_Z, "cHRM Red Z")); 131} 132# endif /* PNG_FLOATING_POINT_SUPPORTED */ 133 134#endif /* PNG_cHRM_SUPPORTED */ 135 136#ifdef PNG_gAMA_SUPPORTED 137void PNGFAPI 138png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr, 139 png_fixed_point file_gamma) 140{ 141 png_debug1(1, "in %s storage function", "gAMA"); 142 143 if (png_ptr == NULL || info_ptr == NULL) 144 return; 145 146 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma); 147 png_colorspace_sync_info(png_ptr, info_ptr); 148} 149 150# ifdef PNG_FLOATING_POINT_SUPPORTED 151void PNGAPI 152png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma) 153{ 154 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma, 155 "png_set_gAMA")); 156} 157# endif 158#endif 159 160#ifdef PNG_hIST_SUPPORTED 161void PNGAPI 162png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr, 163 png_const_uint_16p hist) 164{ 165 int i; 166 167 png_debug1(1, "in %s storage function", "hIST"); 168 169 if (png_ptr == NULL || info_ptr == NULL) 170 return; 171 172 if (info_ptr->num_palette == 0 || info_ptr->num_palette 173 > PNG_MAX_PALETTE_LENGTH) 174 { 175 png_warning(png_ptr, 176 "Invalid palette size, hIST allocation skipped"); 177 178 return; 179 } 180 181 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0); 182 183 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in 184 * version 1.2.1 185 */ 186 info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr, 187 PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16)))); 188 189 if (info_ptr->hist == NULL) 190 { 191 png_warning(png_ptr, "Insufficient memory for hIST chunk data"); 192 return; 193 } 194 195 info_ptr->free_me |= PNG_FREE_HIST; 196 197 for (i = 0; i < info_ptr->num_palette; i++) 198 info_ptr->hist[i] = hist[i]; 199 200 info_ptr->valid |= PNG_INFO_hIST; 201} 202#endif 203 204void PNGAPI 205png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr, 206 png_uint_32 width, png_uint_32 height, int bit_depth, 207 int color_type, int interlace_type, int compression_type, 208 int filter_type) 209{ 210 png_debug1(1, "in %s storage function", "IHDR"); 211 212 if (png_ptr == NULL || info_ptr == NULL) 213 return; 214 215 info_ptr->width = width; 216 info_ptr->height = height; 217 info_ptr->bit_depth = (png_byte)bit_depth; 218 info_ptr->color_type = (png_byte)color_type; 219 info_ptr->compression_type = (png_byte)compression_type; 220 info_ptr->filter_type = (png_byte)filter_type; 221 info_ptr->interlace_type = (png_byte)interlace_type; 222 223 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height, 224 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type, 225 info_ptr->compression_type, info_ptr->filter_type); 226 227 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 228 info_ptr->channels = 1; 229 230 else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR) 231 info_ptr->channels = 3; 232 233 else 234 info_ptr->channels = 1; 235 236 if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA) 237 info_ptr->channels++; 238 239 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth); 240 241 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width); 242} 243 244#ifdef PNG_oFFs_SUPPORTED 245void PNGAPI 246png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr, 247 png_int_32 offset_x, png_int_32 offset_y, int unit_type) 248{ 249 png_debug1(1, "in %s storage function", "oFFs"); 250 251 if (png_ptr == NULL || info_ptr == NULL) 252 return; 253 254 info_ptr->x_offset = offset_x; 255 info_ptr->y_offset = offset_y; 256 info_ptr->offset_unit_type = (png_byte)unit_type; 257 info_ptr->valid |= PNG_INFO_oFFs; 258} 259#endif 260 261#ifdef PNG_pCAL_SUPPORTED 262void PNGAPI 263png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, 264 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, 265 int nparams, png_const_charp units, png_charpp params) 266{ 267 png_size_t length; 268 int i; 269 270 png_debug1(1, "in %s storage function", "pCAL"); 271 272 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL 273 || (nparams > 0 && params == NULL)) 274 return; 275 276 length = strlen(purpose) + 1; 277 png_debug1(3, "allocating purpose for info (%lu bytes)", 278 (unsigned long)length); 279 280 /* TODO: validate format of calibration name and unit name */ 281 282 /* Check that the type matches the specification. */ 283 if (type < 0 || type > 3) 284 png_error(png_ptr, "Invalid pCAL equation type"); 285 286 if (nparams < 0 || nparams > 255) 287 png_error(png_ptr, "Invalid pCAL parameter count"); 288 289 /* Validate params[nparams] */ 290 for (i=0; i<nparams; ++i) 291 if (params[i] == NULL || 292 !png_check_fp_string(params[i], strlen(params[i]))) 293 png_error(png_ptr, "Invalid format for pCAL parameter"); 294 295 info_ptr->pcal_purpose = png_voidcast(png_charp, 296 png_malloc_warn(png_ptr, length)); 297 298 if (info_ptr->pcal_purpose == NULL) 299 { 300 png_warning(png_ptr, "Insufficient memory for pCAL purpose"); 301 return; 302 } 303 304 memcpy(info_ptr->pcal_purpose, purpose, length); 305 306 png_debug(3, "storing X0, X1, type, and nparams in info"); 307 info_ptr->pcal_X0 = X0; 308 info_ptr->pcal_X1 = X1; 309 info_ptr->pcal_type = (png_byte)type; 310 info_ptr->pcal_nparams = (png_byte)nparams; 311 312 length = strlen(units) + 1; 313 png_debug1(3, "allocating units for info (%lu bytes)", 314 (unsigned long)length); 315 316 info_ptr->pcal_units = png_voidcast(png_charp, 317 png_malloc_warn(png_ptr, length)); 318 319 if (info_ptr->pcal_units == NULL) 320 { 321 png_warning(png_ptr, "Insufficient memory for pCAL units"); 322 return; 323 } 324 325 memcpy(info_ptr->pcal_units, units, length); 326 327 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr, 328 (png_size_t)((nparams + 1) * (sizeof (png_charp))))); 329 330 if (info_ptr->pcal_params == NULL) 331 { 332 png_warning(png_ptr, "Insufficient memory for pCAL params"); 333 return; 334 } 335 336 memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp))); 337 338 for (i = 0; i < nparams; i++) 339 { 340 length = strlen(params[i]) + 1; 341 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i, 342 (unsigned long)length); 343 344 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length); 345 346 if (info_ptr->pcal_params[i] == NULL) 347 { 348 png_warning(png_ptr, "Insufficient memory for pCAL parameter"); 349 return; 350 } 351 352 memcpy(info_ptr->pcal_params[i], params[i], length); 353 } 354 355 info_ptr->valid |= PNG_INFO_pCAL; 356 info_ptr->free_me |= PNG_FREE_PCAL; 357} 358#endif 359 360#ifdef PNG_sCAL_SUPPORTED 361void PNGAPI 362png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr, 363 int unit, png_const_charp swidth, png_const_charp sheight) 364{ 365 png_size_t lengthw = 0, lengthh = 0; 366 367 png_debug1(1, "in %s storage function", "sCAL"); 368 369 if (png_ptr == NULL || info_ptr == NULL) 370 return; 371 372 /* Double check the unit (should never get here with an invalid 373 * unit unless this is an API call.) 374 */ 375 if (unit != 1 && unit != 2) 376 png_error(png_ptr, "Invalid sCAL unit"); 377 378 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 || 379 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw)) 380 png_error(png_ptr, "Invalid sCAL width"); 381 382 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 || 383 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh)) 384 png_error(png_ptr, "Invalid sCAL height"); 385 386 info_ptr->scal_unit = (png_byte)unit; 387 388 ++lengthw; 389 390 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw); 391 392 info_ptr->scal_s_width = png_voidcast(png_charp, 393 png_malloc_warn(png_ptr, lengthw)); 394 395 if (info_ptr->scal_s_width == NULL) 396 { 397 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); 398 return; 399 } 400 401 memcpy(info_ptr->scal_s_width, swidth, lengthw); 402 403 ++lengthh; 404 405 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh); 406 407 info_ptr->scal_s_height = png_voidcast(png_charp, 408 png_malloc_warn(png_ptr, lengthh)); 409 410 if (info_ptr->scal_s_height == NULL) 411 { 412 png_free (png_ptr, info_ptr->scal_s_width); 413 info_ptr->scal_s_width = NULL; 414 415 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); 416 return; 417 } 418 419 memcpy(info_ptr->scal_s_height, sheight, lengthh); 420 421 info_ptr->valid |= PNG_INFO_sCAL; 422 info_ptr->free_me |= PNG_FREE_SCAL; 423} 424 425# ifdef PNG_FLOATING_POINT_SUPPORTED 426void PNGAPI 427png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit, 428 double width, double height) 429{ 430 png_debug1(1, "in %s storage function", "sCAL"); 431 432 /* Check the arguments. */ 433 if (width <= 0) 434 png_warning(png_ptr, "Invalid sCAL width ignored"); 435 436 else if (height <= 0) 437 png_warning(png_ptr, "Invalid sCAL height ignored"); 438 439 else 440 { 441 /* Convert 'width' and 'height' to ASCII. */ 442 char swidth[PNG_sCAL_MAX_DIGITS+1]; 443 char sheight[PNG_sCAL_MAX_DIGITS+1]; 444 445 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width, 446 PNG_sCAL_PRECISION); 447 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height, 448 PNG_sCAL_PRECISION); 449 450 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); 451 } 452} 453# endif 454 455# ifdef PNG_FIXED_POINT_SUPPORTED 456void PNGAPI 457png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit, 458 png_fixed_point width, png_fixed_point height) 459{ 460 png_debug1(1, "in %s storage function", "sCAL"); 461 462 /* Check the arguments. */ 463 if (width <= 0) 464 png_warning(png_ptr, "Invalid sCAL width ignored"); 465 466 else if (height <= 0) 467 png_warning(png_ptr, "Invalid sCAL height ignored"); 468 469 else 470 { 471 /* Convert 'width' and 'height' to ASCII. */ 472 char swidth[PNG_sCAL_MAX_DIGITS+1]; 473 char sheight[PNG_sCAL_MAX_DIGITS+1]; 474 475 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width); 476 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height); 477 478 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); 479 } 480} 481# endif 482#endif 483 484#ifdef PNG_pHYs_SUPPORTED 485void PNGAPI 486png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr, 487 png_uint_32 res_x, png_uint_32 res_y, int unit_type) 488{ 489 png_debug1(1, "in %s storage function", "pHYs"); 490 491 if (png_ptr == NULL || info_ptr == NULL) 492 return; 493 494 info_ptr->x_pixels_per_unit = res_x; 495 info_ptr->y_pixels_per_unit = res_y; 496 info_ptr->phys_unit_type = (png_byte)unit_type; 497 info_ptr->valid |= PNG_INFO_pHYs; 498} 499#endif 500 501void PNGAPI 502png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr, 503 png_const_colorp palette, int num_palette) 504{ 505 506 png_debug1(1, "in %s storage function", "PLTE"); 507 508 if (png_ptr == NULL || info_ptr == NULL) 509 return; 510 511 if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH) 512 { 513 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 514 png_error(png_ptr, "Invalid palette length"); 515 516 else 517 { 518 png_warning(png_ptr, "Invalid palette length"); 519 return; 520 } 521 } 522 523 if ((num_palette > 0 && palette == NULL) || 524 (num_palette == 0 525# ifdef PNG_MNG_FEATURES_SUPPORTED 526 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 527# endif 528 )) 529 { 530 png_error(png_ptr, "Invalid palette"); 531 return; 532 } 533 534 /* It may not actually be necessary to set png_ptr->palette here; 535 * we do it for backward compatibility with the way the png_handle_tRNS 536 * function used to do the allocation. 537 * 538 * 1.6.0: the above statement appears to be incorrect; something has to set 539 * the palette inside png_struct on read. 540 */ 541 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); 542 543 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead 544 * of num_palette entries, in case of an invalid PNG file that has 545 * too-large sample values. 546 */ 547 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr, 548 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)))); 549 550 if (num_palette > 0) 551 memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color))); 552 info_ptr->palette = png_ptr->palette; 553 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; 554 555 info_ptr->free_me |= PNG_FREE_PLTE; 556 557 info_ptr->valid |= PNG_INFO_PLTE; 558} 559 560#ifdef PNG_sBIT_SUPPORTED 561void PNGAPI 562png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, 563 png_const_color_8p sig_bit) 564{ 565 png_debug1(1, "in %s storage function", "sBIT"); 566 567 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL) 568 return; 569 570 info_ptr->sig_bit = *sig_bit; 571 info_ptr->valid |= PNG_INFO_sBIT; 572} 573#endif 574 575#ifdef PNG_sRGB_SUPPORTED 576void PNGAPI 577png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent) 578{ 579 png_debug1(1, "in %s storage function", "sRGB"); 580 581 if (png_ptr == NULL || info_ptr == NULL) 582 return; 583 584 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent); 585 png_colorspace_sync_info(png_ptr, info_ptr); 586} 587 588void PNGAPI 589png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, 590 int srgb_intent) 591{ 592 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM"); 593 594 if (png_ptr == NULL || info_ptr == NULL) 595 return; 596 597 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent)) 598 { 599 /* This causes the gAMA and cHRM to be written too */ 600 info_ptr->colorspace.flags |= 601 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; 602 } 603 604 png_colorspace_sync_info(png_ptr, info_ptr); 605} 606#endif /* sRGB */ 607 608 609#ifdef PNG_iCCP_SUPPORTED 610void PNGAPI 611png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr, 612 png_const_charp name, int compression_type, 613 png_const_bytep profile, png_uint_32 proflen) 614{ 615 png_charp new_iccp_name; 616 png_bytep new_iccp_profile; 617 png_size_t length; 618 619 png_debug1(1, "in %s storage function", "iCCP"); 620 621 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL) 622 return; 623 624 if (compression_type != PNG_COMPRESSION_TYPE_BASE) 625 png_app_error(png_ptr, "Invalid iCCP compression method"); 626 627 /* Set the colorspace first because this validates the profile; do not 628 * override previously set app cHRM or gAMA here (because likely as not the 629 * application knows better than libpng what the correct values are.) Pass 630 * the info_ptr color_type field to png_colorspace_set_ICC because in the 631 * write case it has not yet been stored in png_ptr. 632 */ 633 { 634 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name, 635 proflen, profile, info_ptr->color_type); 636 637 png_colorspace_sync_info(png_ptr, info_ptr); 638 639 /* Don't do any of the copying if the profile was bad, or inconsistent. */ 640 if (!result) 641 return; 642 643 /* But do write the gAMA and cHRM chunks from the profile. */ 644 info_ptr->colorspace.flags |= 645 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; 646 } 647 648 length = strlen(name)+1; 649 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length)); 650 651 if (new_iccp_name == NULL) 652 { 653 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk"); 654 return; 655 } 656 657 memcpy(new_iccp_name, name, length); 658 new_iccp_profile = png_voidcast(png_bytep, 659 png_malloc_warn(png_ptr, proflen)); 660 661 if (new_iccp_profile == NULL) 662 { 663 png_free(png_ptr, new_iccp_name); 664 png_benign_error(png_ptr, 665 "Insufficient memory to process iCCP profile"); 666 return; 667 } 668 669 memcpy(new_iccp_profile, profile, proflen); 670 671 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0); 672 673 info_ptr->iccp_proflen = proflen; 674 info_ptr->iccp_name = new_iccp_name; 675 info_ptr->iccp_profile = new_iccp_profile; 676 info_ptr->free_me |= PNG_FREE_ICCP; 677 info_ptr->valid |= PNG_INFO_iCCP; 678} 679#endif 680 681#ifdef PNG_TEXT_SUPPORTED 682void PNGAPI 683png_set_text(png_const_structrp png_ptr, png_inforp info_ptr, 684 png_const_textp text_ptr, int num_text) 685{ 686 int ret; 687 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text); 688 689 if (ret) 690 png_error(png_ptr, "Insufficient memory to store text"); 691} 692 693int /* PRIVATE */ 694png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr, 695 png_const_textp text_ptr, int num_text) 696{ 697 int i; 698 699 png_debug1(1, "in %lx storage function", png_ptr == NULL ? "unexpected" : 700 (unsigned long)png_ptr->chunk_name); 701 702 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL) 703 return(0); 704 705 /* Make sure we have enough space in the "text" array in info_struct 706 * to hold all of the incoming text_ptr objects. This compare can't overflow 707 * because max_text >= num_text (anyway, subtract of two positive integers 708 * can't overflow in any case.) 709 */ 710 if (num_text > info_ptr->max_text - info_ptr->num_text) 711 { 712 int old_num_text = info_ptr->num_text; 713 int max_text; 714 png_textp new_text = NULL; 715 716 /* Calculate an appropriate max_text, checking for overflow. */ 717 max_text = old_num_text; 718 if (num_text <= INT_MAX - max_text) 719 { 720 max_text += num_text; 721 722 /* Round up to a multiple of 8 */ 723 if (max_text < INT_MAX-8) 724 max_text = (max_text + 8) & ~0x7; 725 726 else 727 max_text = INT_MAX; 728 729 /* Now allocate a new array and copy the old members in, this does all 730 * the overflow checks. 731 */ 732 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr, 733 info_ptr->text, old_num_text, max_text-old_num_text, 734 sizeof *new_text)); 735 } 736 737 if (new_text == NULL) 738 { 739 png_chunk_report(png_ptr, "too many text chunks", 740 PNG_CHUNK_WRITE_ERROR); 741 return 1; 742 } 743 744 png_free(png_ptr, info_ptr->text); 745 746 info_ptr->text = new_text; 747 info_ptr->free_me |= PNG_FREE_TEXT; 748 info_ptr->max_text = max_text; 749 /* num_text is adjusted below as the entries are copied in */ 750 751 png_debug1(3, "allocated %d entries for info_ptr->text", max_text); 752 } 753 754 for (i = 0; i < num_text; i++) 755 { 756 size_t text_length, key_len; 757 size_t lang_len, lang_key_len; 758 png_textp textp = &(info_ptr->text[info_ptr->num_text]); 759 760 if (text_ptr[i].key == NULL) 761 continue; 762 763 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE || 764 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST) 765 { 766 png_chunk_report(png_ptr, "text compression mode is out of range", 767 PNG_CHUNK_WRITE_ERROR); 768 continue; 769 } 770 771 key_len = strlen(text_ptr[i].key); 772 773 if (text_ptr[i].compression <= 0) 774 { 775 lang_len = 0; 776 lang_key_len = 0; 777 } 778 779 else 780# ifdef PNG_iTXt_SUPPORTED 781 { 782 /* Set iTXt data */ 783 784 if (text_ptr[i].lang != NULL) 785 lang_len = strlen(text_ptr[i].lang); 786 787 else 788 lang_len = 0; 789 790 if (text_ptr[i].lang_key != NULL) 791 lang_key_len = strlen(text_ptr[i].lang_key); 792 793 else 794 lang_key_len = 0; 795 } 796# else /* PNG_iTXt_SUPPORTED */ 797 { 798 png_chunk_report(png_ptr, "iTXt chunk not supported", 799 PNG_CHUNK_WRITE_ERROR); 800 continue; 801 } 802# endif 803 804 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0') 805 { 806 text_length = 0; 807# ifdef PNG_iTXt_SUPPORTED 808 if (text_ptr[i].compression > 0) 809 textp->compression = PNG_ITXT_COMPRESSION_NONE; 810 811 else 812# endif 813 textp->compression = PNG_TEXT_COMPRESSION_NONE; 814 } 815 816 else 817 { 818 text_length = strlen(text_ptr[i].text); 819 textp->compression = text_ptr[i].compression; 820 } 821 822 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr, 823 key_len + text_length + lang_len + lang_key_len + 4)); 824 825 if (textp->key == NULL) 826 { 827 png_chunk_report(png_ptr, "text chunk: out of memory", 828 PNG_CHUNK_WRITE_ERROR); 829 return 1; 830 } 831 832 png_debug2(2, "Allocated %lu bytes at %p in png_set_text", 833 (unsigned long)(png_uint_32) 834 (key_len + lang_len + lang_key_len + text_length + 4), 835 textp->key); 836 837 memcpy(textp->key, text_ptr[i].key, key_len); 838 *(textp->key + key_len) = '\0'; 839 840 if (text_ptr[i].compression > 0) 841 { 842 textp->lang = textp->key + key_len + 1; 843 memcpy(textp->lang, text_ptr[i].lang, lang_len); 844 *(textp->lang + lang_len) = '\0'; 845 textp->lang_key = textp->lang + lang_len + 1; 846 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); 847 *(textp->lang_key + lang_key_len) = '\0'; 848 textp->text = textp->lang_key + lang_key_len + 1; 849 } 850 851 else 852 { 853 textp->lang=NULL; 854 textp->lang_key=NULL; 855 textp->text = textp->key + key_len + 1; 856 } 857 858 if (text_length) 859 memcpy(textp->text, text_ptr[i].text, text_length); 860 861 *(textp->text + text_length) = '\0'; 862 863# ifdef PNG_iTXt_SUPPORTED 864 if (textp->compression > 0) 865 { 866 textp->text_length = 0; 867 textp->itxt_length = text_length; 868 } 869 870 else 871# endif 872 { 873 textp->text_length = text_length; 874 textp->itxt_length = 0; 875 } 876 877 info_ptr->num_text++; 878 png_debug1(3, "transferred text chunk %d", info_ptr->num_text); 879 } 880 881 return(0); 882} 883#endif 884 885#ifdef PNG_tIME_SUPPORTED 886void PNGAPI 887png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr, 888 png_const_timep mod_time) 889{ 890 png_debug1(1, "in %s storage function", "tIME"); 891 892 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL || 893 (png_ptr->mode & PNG_WROTE_tIME)) 894 return; 895 896 if (mod_time->month == 0 || mod_time->month > 12 || 897 mod_time->day == 0 || mod_time->day > 31 || 898 mod_time->hour > 23 || mod_time->minute > 59 || 899 mod_time->second > 60) 900 { 901 png_warning(png_ptr, "Ignoring invalid time value"); 902 return; 903 } 904 905 info_ptr->mod_time = *mod_time; 906 info_ptr->valid |= PNG_INFO_tIME; 907} 908#endif 909 910#ifdef PNG_tRNS_SUPPORTED 911void PNGAPI 912png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr, 913 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color) 914{ 915 png_debug1(1, "in %s storage function", "tRNS"); 916 917 if (png_ptr == NULL || info_ptr == NULL) 918 return; 919 920 if (trans_alpha != NULL) 921 { 922 /* It may not actually be necessary to set png_ptr->trans_alpha here; 923 * we do it for backward compatibility with the way the png_handle_tRNS 924 * function used to do the allocation. 925 * 926 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively 927 * relies on png_set_tRNS storing the information in png_struct 928 * (otherwise it won't be there for the code in pngrtran.c). 929 */ 930 931 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0); 932 933 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */ 934 png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep, 935 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH)); 936 937 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH) 938 memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans); 939 } 940 941 if (trans_color != NULL) 942 { 943 int sample_max = (1 << info_ptr->bit_depth); 944 945 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY && 946 trans_color->gray > sample_max) || 947 (info_ptr->color_type == PNG_COLOR_TYPE_RGB && 948 (trans_color->red > sample_max || 949 trans_color->green > sample_max || 950 trans_color->blue > sample_max))) 951 png_warning(png_ptr, 952 "tRNS chunk has out-of-range samples for bit_depth"); 953 954 info_ptr->trans_color = *trans_color; 955 956 if (num_trans == 0) 957 num_trans = 1; 958 } 959 960 info_ptr->num_trans = (png_uint_16)num_trans; 961 962 if (num_trans != 0) 963 { 964 info_ptr->valid |= PNG_INFO_tRNS; 965 info_ptr->free_me |= PNG_FREE_TRNS; 966 } 967} 968#endif 969 970#ifdef PNG_sPLT_SUPPORTED 971void PNGAPI 972png_set_sPLT(png_const_structrp png_ptr, 973 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries) 974/* 975 * entries - array of png_sPLT_t structures 976 * to be added to the list of palettes 977 * in the info structure. 978 * 979 * nentries - number of palette structures to be 980 * added. 981 */ 982{ 983 png_sPLT_tp np; 984 985 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL) 986 return; 987 988 /* Use the internal realloc function, which checks for all the possible 989 * overflows. Notice that the parameters are (int) and (size_t) 990 */ 991 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr, 992 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries, 993 sizeof *np)); 994 995 if (np == NULL) 996 { 997 /* Out of memory or too many chunks */ 998 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR); 999 return; 1000 } 1001 1002 png_free(png_ptr, info_ptr->splt_palettes); 1003 info_ptr->splt_palettes = np; 1004 info_ptr->free_me |= PNG_FREE_SPLT; 1005 1006 np += info_ptr->splt_palettes_num; 1007 1008 do 1009 { 1010 png_size_t length; 1011 1012 /* Skip invalid input entries */ 1013 if (entries->name == NULL || entries->entries == NULL) 1014 { 1015 /* png_handle_sPLT doesn't do this, so this is an app error */ 1016 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT"); 1017 /* Just skip the invalid entry */ 1018 continue; 1019 } 1020 1021 np->depth = entries->depth; 1022 1023 /* In the even of out-of-memory just return - there's no point keeping on 1024 * trying to add sPLT chunks. 1025 */ 1026 length = strlen(entries->name) + 1; 1027 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length)); 1028 1029 if (np->name == NULL) 1030 break; 1031 1032 memcpy(np->name, entries->name, length); 1033 1034 /* IMPORTANT: we have memory now that won't get freed if something else 1035 * goes wrong, this code must free it. png_malloc_array produces no 1036 * warnings, use a png_chunk_report (below) if there is an error. 1037 */ 1038 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr, 1039 entries->nentries, sizeof (png_sPLT_entry))); 1040 1041 if (np->entries == NULL) 1042 { 1043 png_free(png_ptr, np->name); 1044 break; 1045 } 1046 1047 np->nentries = entries->nentries; 1048 /* This multiply can't overflow because png_malloc_array has already 1049 * checked it when doing the allocation. 1050 */ 1051 memcpy(np->entries, entries->entries, 1052 entries->nentries * sizeof (png_sPLT_entry)); 1053 1054 /* Note that 'continue' skips the advance of the out pointer and out 1055 * count, so an invalid entry is not added. 1056 */ 1057 info_ptr->valid |= PNG_INFO_sPLT; 1058 ++(info_ptr->splt_palettes_num); 1059 ++np; 1060 } 1061 while (++entries, --nentries); 1062 1063 if (nentries > 0) 1064 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR); 1065} 1066#endif /* PNG_sPLT_SUPPORTED */ 1067 1068#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED 1069static png_byte 1070check_location(png_const_structrp png_ptr, int location) 1071{ 1072 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT); 1073 1074 /* New in 1.6.0; copy the location and check it. This is an API 1075 * change, previously the app had to use the 1076 * png_set_unknown_chunk_location API below for each chunk. 1077 */ 1078 if (location == 0 && !(png_ptr->mode & PNG_IS_READ_STRUCT)) 1079 { 1080 /* Write struct, so unknown chunks come from the app */ 1081 png_app_warning(png_ptr, 1082 "png_set_unknown_chunks now expects a valid location"); 1083 /* Use the old behavior */ 1084 location = (png_byte)(png_ptr->mode & 1085 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)); 1086 } 1087 1088 /* This need not be an internal error - if the app calls 1089 * png_set_unknown_chunks on a read pointer it must get the location right. 1090 */ 1091 if (location == 0) 1092 png_error(png_ptr, "invalid location in png_set_unknown_chunks"); 1093 1094 /* Now reduce the location to the top-most set bit by removing each least 1095 * significant bit in turn. 1096 */ 1097 while (location != (location & -location)) 1098 location &= ~(location & -location); 1099 1100 /* The cast is safe because 'location' is a bit mask and only the low four 1101 * bits are significant. 1102 */ 1103 return (png_byte)location; 1104} 1105 1106void PNGAPI 1107png_set_unknown_chunks(png_const_structrp png_ptr, 1108 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns) 1109{ 1110 png_unknown_chunkp np; 1111 1112 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 || 1113 unknowns == NULL) 1114 return; 1115 1116 /* Check for the failure cases where support has been disabled at compile 1117 * time. This code is hardly ever compiled - it's here because 1118 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this 1119 * code) but may be meaningless if the read or write handling of unknown 1120 * chunks is not compiled in. 1121 */ 1122# if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \ 1123 defined(PNG_READ_SUPPORTED) 1124 if (png_ptr->mode & PNG_IS_READ_STRUCT) 1125 { 1126 png_app_error(png_ptr, "no unknown chunk support on read"); 1127 return; 1128 } 1129# endif 1130# if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \ 1131 defined(PNG_WRITE_SUPPORTED) 1132 if (!(png_ptr->mode & PNG_IS_READ_STRUCT)) 1133 { 1134 png_app_error(png_ptr, "no unknown chunk support on write"); 1135 return; 1136 } 1137# endif 1138 1139 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that 1140 * unknown critical chunks could be lost with just a warning resulting in 1141 * undefined behavior. Now png_chunk_report is used to provide behavior 1142 * appropriate to read or write. 1143 */ 1144 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr, 1145 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns, 1146 sizeof *np)); 1147 1148 if (np == NULL) 1149 { 1150 png_chunk_report(png_ptr, "too many unknown chunks", 1151 PNG_CHUNK_WRITE_ERROR); 1152 return; 1153 } 1154 1155 png_free(png_ptr, info_ptr->unknown_chunks); 1156 info_ptr->unknown_chunks = np; /* safe because it is initialized */ 1157 info_ptr->free_me |= PNG_FREE_UNKN; 1158 1159 np += info_ptr->unknown_chunks_num; 1160 1161 /* Increment unknown_chunks_num each time round the loop to protect the 1162 * just-allocated chunk data. 1163 */ 1164 for (; num_unknowns > 0; --num_unknowns, ++unknowns) 1165 { 1166 memcpy(np->name, unknowns->name, (sizeof np->name)); 1167 np->name[(sizeof np->name)-1] = '\0'; 1168 np->location = check_location(png_ptr, unknowns->location); 1169 1170 if (unknowns->size == 0) 1171 { 1172 np->data = NULL; 1173 np->size = 0; 1174 } 1175 1176 else 1177 { 1178 np->data = png_voidcast(png_bytep, 1179 png_malloc_base(png_ptr, unknowns->size)); 1180 1181 if (np->data == NULL) 1182 { 1183 png_chunk_report(png_ptr, "unknown chunk: out of memory", 1184 PNG_CHUNK_WRITE_ERROR); 1185 /* But just skip storing the unknown chunk */ 1186 continue; 1187 } 1188 1189 memcpy(np->data, unknowns->data, unknowns->size); 1190 np->size = unknowns->size; 1191 } 1192 1193 /* These increments are skipped on out-of-memory for the data - the 1194 * unknown chunk entry gets overwritten if the png_chunk_report returns. 1195 * This is correct in the read case (the chunk is just dropped.) 1196 */ 1197 ++np; 1198 ++(info_ptr->unknown_chunks_num); 1199 } 1200} 1201 1202void PNGAPI 1203png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr, 1204 int chunk, int location) 1205{ 1206 /* This API is pretty pointless in 1.6.0 because the location can be set 1207 * before the call to png_set_unknown_chunks. 1208 * 1209 * TODO: add a png_app_warning in 1.7 1210 */ 1211 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && 1212 chunk < info_ptr->unknown_chunks_num) 1213 { 1214 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0) 1215 { 1216 png_app_error(png_ptr, "invalid unknown chunk location"); 1217 /* Fake out the pre 1.6.0 behavior: */ 1218 if ((location & PNG_HAVE_IDAT)) /* undocumented! */ 1219 location = PNG_AFTER_IDAT; 1220 1221 else 1222 location = PNG_HAVE_IHDR; /* also undocumented */ 1223 } 1224 1225 info_ptr->unknown_chunks[chunk].location = 1226 check_location(png_ptr, location); 1227 } 1228} 1229#endif 1230 1231 1232#ifdef PNG_MNG_FEATURES_SUPPORTED 1233png_uint_32 PNGAPI 1234png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features) 1235{ 1236 png_debug(1, "in png_permit_mng_features"); 1237 1238 if (png_ptr == NULL) 1239 return 0; 1240 1241 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES; 1242 1243 return png_ptr->mng_features_permitted; 1244} 1245#endif 1246 1247#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 1248static unsigned int 1249add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep) 1250{ 1251 unsigned int i; 1252 1253 /* Utility function: update the 'keep' state of a chunk if it is already in 1254 * the list, otherwise add it to the list. 1255 */ 1256 for (i=0; i<count; ++i, list += 5) if (memcmp(list, add, 4) == 0) 1257 { 1258 list[4] = (png_byte)keep; 1259 return count; 1260 } 1261 1262 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT) 1263 { 1264 ++count; 1265 memcpy(list, add, 4); 1266 list[4] = (png_byte)keep; 1267 } 1268 1269 return count; 1270} 1271 1272void PNGAPI 1273png_set_keep_unknown_chunks(png_structrp png_ptr, int keep, 1274 png_const_bytep chunk_list, int num_chunks_in) 1275{ 1276 png_bytep new_list; 1277 unsigned int num_chunks, old_num_chunks; 1278 1279 if (png_ptr == NULL) 1280 return; 1281 1282 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST) 1283 { 1284 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep"); 1285 return; 1286 } 1287 1288 if (num_chunks_in <= 0) 1289 { 1290 png_ptr->unknown_default = keep; 1291 1292 /* '0' means just set the flags, so stop here */ 1293 if (num_chunks_in == 0) 1294 return; 1295 } 1296 1297 if (num_chunks_in < 0) 1298 { 1299 /* Ignore all unknown chunks and all chunks recognized by 1300 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND 1301 */ 1302 static PNG_CONST png_byte chunks_to_ignore[] = { 1303 98, 75, 71, 68, '\0', /* bKGD */ 1304 99, 72, 82, 77, '\0', /* cHRM */ 1305 103, 65, 77, 65, '\0', /* gAMA */ 1306 104, 73, 83, 84, '\0', /* hIST */ 1307 105, 67, 67, 80, '\0', /* iCCP */ 1308 105, 84, 88, 116, '\0', /* iTXt */ 1309 111, 70, 70, 115, '\0', /* oFFs */ 1310 112, 67, 65, 76, '\0', /* pCAL */ 1311 112, 72, 89, 115, '\0', /* pHYs */ 1312 115, 66, 73, 84, '\0', /* sBIT */ 1313 115, 67, 65, 76, '\0', /* sCAL */ 1314 115, 80, 76, 84, '\0', /* sPLT */ 1315 115, 84, 69, 82, '\0', /* sTER */ 1316 115, 82, 71, 66, '\0', /* sRGB */ 1317 116, 69, 88, 116, '\0', /* tEXt */ 1318 116, 73, 77, 69, '\0', /* tIME */ 1319 122, 84, 88, 116, '\0' /* zTXt */ 1320 }; 1321 1322 chunk_list = chunks_to_ignore; 1323 num_chunks = (sizeof chunks_to_ignore)/5; 1324 } 1325 1326 else /* num_chunks_in > 0 */ 1327 { 1328 if (chunk_list == NULL) 1329 { 1330 /* Prior to 1.6.0 this was silently ignored, now it is an app_error 1331 * which can be switched off. 1332 */ 1333 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list"); 1334 return; 1335 } 1336 1337 num_chunks = num_chunks_in; 1338 } 1339 1340 old_num_chunks = png_ptr->num_chunk_list; 1341 if (png_ptr->chunk_list == NULL) 1342 old_num_chunks = 0; 1343 1344 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow. 1345 */ 1346 if (num_chunks + old_num_chunks > UINT_MAX/5) 1347 { 1348 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks"); 1349 return; 1350 } 1351 1352 /* If these chunks are being reset to the default then no more memory is 1353 * required because add_one_chunk above doesn't extend the list if the 'keep' 1354 * parameter is the default. 1355 */ 1356 if (keep) 1357 { 1358 new_list = png_voidcast(png_bytep, png_malloc(png_ptr, 1359 5 * (num_chunks + old_num_chunks))); 1360 1361 if (old_num_chunks > 0) 1362 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks); 1363 } 1364 1365 else if (old_num_chunks > 0) 1366 new_list = png_ptr->chunk_list; 1367 1368 else 1369 new_list = NULL; 1370 1371 /* Add the new chunks together with each one's handling code. If the chunk 1372 * already exists the code is updated, otherwise the chunk is added to the 1373 * end. (In libpng 1.6.0 order no longer matters because this code enforces 1374 * the earlier convention that the last setting is the one that is used.) 1375 */ 1376 if (new_list != NULL) 1377 { 1378 png_const_bytep inlist; 1379 png_bytep outlist; 1380 unsigned int i; 1381 1382 for (i=0; i<num_chunks; ++i) 1383 old_num_chunks = add_one_chunk(new_list, old_num_chunks, 1384 chunk_list+5*i, keep); 1385 1386 /* Now remove any spurious 'default' entries. */ 1387 num_chunks = 0; 1388 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5) 1389 if (inlist[4]) 1390 { 1391 if (outlist != inlist) 1392 memcpy(outlist, inlist, 5); 1393 outlist += 5; 1394 ++num_chunks; 1395 } 1396 1397 /* This means the application has removed all the specialized handling. */ 1398 if (num_chunks == 0) 1399 { 1400 if (png_ptr->chunk_list != new_list) 1401 png_free(png_ptr, new_list); 1402 1403 new_list = NULL; 1404 } 1405 } 1406 1407 else 1408 num_chunks = 0; 1409 1410 png_ptr->num_chunk_list = num_chunks; 1411 1412 if (png_ptr->chunk_list != new_list) 1413 { 1414 if (png_ptr->chunk_list != NULL) 1415 png_free(png_ptr, png_ptr->chunk_list); 1416 1417 png_ptr->chunk_list = new_list; 1418 } 1419} 1420#endif 1421 1422#ifdef PNG_READ_USER_CHUNKS_SUPPORTED 1423void PNGAPI 1424png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr, 1425 png_user_chunk_ptr read_user_chunk_fn) 1426{ 1427 png_debug(1, "in png_set_read_user_chunk_fn"); 1428 1429 if (png_ptr == NULL) 1430 return; 1431 1432 png_ptr->read_user_chunk_fn = read_user_chunk_fn; 1433 png_ptr->user_chunk_ptr = user_chunk_ptr; 1434} 1435#endif 1436 1437#ifdef PNG_INFO_IMAGE_SUPPORTED 1438void PNGAPI 1439png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr, 1440 png_bytepp row_pointers) 1441{ 1442 png_debug1(1, "in %s storage function", "rows"); 1443 1444 if (png_ptr == NULL || info_ptr == NULL) 1445 return; 1446 1447 if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers)) 1448 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); 1449 1450 info_ptr->row_pointers = row_pointers; 1451 1452 if (row_pointers) 1453 info_ptr->valid |= PNG_INFO_IDAT; 1454} 1455#endif 1456 1457void PNGAPI 1458png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size) 1459{ 1460 if (png_ptr == NULL) 1461 return; 1462 1463 if (size == 0 || size > PNG_UINT_31_MAX) 1464 png_error(png_ptr, "invalid compression buffer size"); 1465 1466# ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1467 if (png_ptr->mode & PNG_IS_READ_STRUCT) 1468 { 1469 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */ 1470 return; 1471 } 1472# endif 1473 1474# ifdef PNG_WRITE_SUPPORTED 1475 if (!(png_ptr->mode & PNG_IS_READ_STRUCT)) 1476 { 1477 if (png_ptr->zowner != 0) 1478 { 1479 png_warning(png_ptr, 1480 "Compression buffer size cannot be changed because it is in use"); 1481 return; 1482 } 1483 1484 if (size > ZLIB_IO_MAX) 1485 { 1486 png_warning(png_ptr, 1487 "Compression buffer size limited to system maximum"); 1488 size = ZLIB_IO_MAX; /* must fit */ 1489 } 1490 1491 else if (size < 6) 1492 { 1493 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH 1494 * if this is permitted. 1495 */ 1496 png_warning(png_ptr, 1497 "Compression buffer size cannot be reduced below 6"); 1498 return; 1499 } 1500 1501 if (png_ptr->zbuffer_size != size) 1502 { 1503 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list); 1504 png_ptr->zbuffer_size = (uInt)size; 1505 } 1506 } 1507# endif 1508} 1509 1510void PNGAPI 1511png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask) 1512{ 1513 if (png_ptr && info_ptr) 1514 info_ptr->valid &= ~mask; 1515} 1516 1517 1518#ifdef PNG_SET_USER_LIMITS_SUPPORTED 1519/* This function was added to libpng 1.2.6 */ 1520void PNGAPI 1521png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max, 1522 png_uint_32 user_height_max) 1523{ 1524 /* Images with dimensions larger than these limits will be 1525 * rejected by png_set_IHDR(). To accept any PNG datastream 1526 * regardless of dimensions, set both limits to 0x7ffffffL. 1527 */ 1528 if (png_ptr == NULL) 1529 return; 1530 1531 png_ptr->user_width_max = user_width_max; 1532 png_ptr->user_height_max = user_height_max; 1533} 1534 1535/* This function was added to libpng 1.4.0 */ 1536void PNGAPI 1537png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max) 1538{ 1539 if (png_ptr) 1540 png_ptr->user_chunk_cache_max = user_chunk_cache_max; 1541} 1542 1543/* This function was added to libpng 1.4.1 */ 1544void PNGAPI 1545png_set_chunk_malloc_max (png_structrp png_ptr, 1546 png_alloc_size_t user_chunk_malloc_max) 1547{ 1548 if (png_ptr) 1549 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max; 1550} 1551#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */ 1552 1553 1554#ifdef PNG_BENIGN_ERRORS_SUPPORTED 1555void PNGAPI 1556png_set_benign_errors(png_structrp png_ptr, int allowed) 1557{ 1558 png_debug(1, "in png_set_benign_errors"); 1559 1560 /* If allowed is 1, png_benign_error() is treated as a warning. 1561 * 1562 * If allowed is 0, png_benign_error() is treated as an error (which 1563 * is the default behavior if png_set_benign_errors() is not called). 1564 */ 1565 1566 if (allowed) 1567 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN | 1568 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN; 1569 1570 else 1571 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN | 1572 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN); 1573} 1574#endif /* PNG_BENIGN_ERRORS_SUPPORTED */ 1575 1576#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED 1577 /* Whether to report invalid palette index; added at libng-1.5.10. 1578 * It is possible for an indexed (color-type==3) PNG file to contain 1579 * pixels with invalid (out-of-range) indexes if the PLTE chunk has 1580 * fewer entries than the image's bit-depth would allow. We recover 1581 * from this gracefully by filling any incomplete palette with zeroes 1582 * (opaque black). By default, when this occurs libpng will issue 1583 * a benign error. This API can be used to override that behavior. 1584 */ 1585void PNGAPI 1586png_set_check_for_invalid_index(png_structrp png_ptr, int allowed) 1587{ 1588 png_debug(1, "in png_set_check_for_invalid_index"); 1589 1590 if (allowed > 0) 1591 png_ptr->num_palette_max = 0; 1592 1593 else 1594 png_ptr->num_palette_max = -1; 1595} 1596#endif 1597#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ 1598