1 /* 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. Oracle designates this 7 * particular file as subject to the "Classpath" exception as provided 8 * by Oracle in the LICENSE file that accompanied this code. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 */ 24 25 /* pngset.c - storage of image information into info struct 26 * 27 * This file is available under and governed by the GNU General Public 28 * License version 2 only, as published by the Free Software Foundation. 29 * However, the following notice accompanied the original version of this 30 * file and, per its terms, should not be removed: 31 * 32 * Last changed in libpng 1.6.23 [June 9, 2016] 33 * Copyright (c) 1998-2016 Glenn Randers-Pehrson 34 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 35 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 36 * 37 * This code is released under the libpng license. 38 * For conditions of distribution and use, see the disclaimer 39 * and license in png.h 40 * 41 * The functions here are used during reads to store data from the file 42 * into the info struct, and during writes to store application data 43 * into the info struct for writing into the file. This abstracts the 44 * info struct and allows us to change the structure in the future. 45 */ 46 47 #include "pngpriv.h" 48 49 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) 50 51 #ifdef PNG_bKGD_SUPPORTED 52 void PNGAPI 53 png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr, 54 png_const_color_16p background) 55 { 56 png_debug1(1, "in %s storage function", "bKGD"); 57 58 if (png_ptr == NULL || info_ptr == NULL || background == NULL) 59 return; 60 61 info_ptr->background = *background; 62 info_ptr->valid |= PNG_INFO_bKGD; 63 } 64 #endif 65 66 #ifdef PNG_cHRM_SUPPORTED 67 void PNGFAPI 68 png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr, 69 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, 70 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, 71 png_fixed_point blue_x, png_fixed_point blue_y) 72 { 73 png_xy xy; 74 75 png_debug1(1, "in %s storage function", "cHRM fixed"); 76 77 if (png_ptr == NULL || info_ptr == NULL) 78 return; 79 80 xy.redx = red_x; 81 xy.redy = red_y; 82 xy.greenx = green_x; 83 xy.greeny = green_y; 84 xy.bluex = blue_x; 85 xy.bluey = blue_y; 86 xy.whitex = white_x; 87 xy.whitey = white_y; 88 89 if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy, 90 2/* override with app values*/) != 0) 91 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; 92 93 png_colorspace_sync_info(png_ptr, info_ptr); 94 } 95 96 void PNGFAPI 97 png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr, 98 png_fixed_point int_red_X, png_fixed_point int_red_Y, 99 png_fixed_point int_red_Z, png_fixed_point int_green_X, 100 png_fixed_point int_green_Y, png_fixed_point int_green_Z, 101 png_fixed_point int_blue_X, png_fixed_point int_blue_Y, 102 png_fixed_point int_blue_Z) 103 { 104 png_XYZ XYZ; 105 106 png_debug1(1, "in %s storage function", "cHRM XYZ fixed"); 107 108 if (png_ptr == NULL || info_ptr == NULL) 109 return; 110 111 XYZ.red_X = int_red_X; 112 XYZ.red_Y = int_red_Y; 113 XYZ.red_Z = int_red_Z; 114 XYZ.green_X = int_green_X; 115 XYZ.green_Y = int_green_Y; 116 XYZ.green_Z = int_green_Z; 117 XYZ.blue_X = int_blue_X; 118 XYZ.blue_Y = int_blue_Y; 119 XYZ.blue_Z = int_blue_Z; 120 121 if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace, 122 &XYZ, 2) != 0) 123 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; 124 125 png_colorspace_sync_info(png_ptr, info_ptr); 126 } 127 128 # ifdef PNG_FLOATING_POINT_SUPPORTED 129 void PNGAPI 130 png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, 131 double white_x, double white_y, double red_x, double red_y, 132 double green_x, double green_y, double blue_x, double blue_y) 133 { 134 png_set_cHRM_fixed(png_ptr, info_ptr, 135 png_fixed(png_ptr, white_x, "cHRM White X"), 136 png_fixed(png_ptr, white_y, "cHRM White Y"), 137 png_fixed(png_ptr, red_x, "cHRM Red X"), 138 png_fixed(png_ptr, red_y, "cHRM Red Y"), 139 png_fixed(png_ptr, green_x, "cHRM Green X"), 140 png_fixed(png_ptr, green_y, "cHRM Green Y"), 141 png_fixed(png_ptr, blue_x, "cHRM Blue X"), 142 png_fixed(png_ptr, blue_y, "cHRM Blue Y")); 143 } 144 145 void PNGAPI 146 png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X, 147 double red_Y, double red_Z, double green_X, double green_Y, double green_Z, 148 double blue_X, double blue_Y, double blue_Z) 149 { 150 png_set_cHRM_XYZ_fixed(png_ptr, info_ptr, 151 png_fixed(png_ptr, red_X, "cHRM Red X"), 152 png_fixed(png_ptr, red_Y, "cHRM Red Y"), 153 png_fixed(png_ptr, red_Z, "cHRM Red Z"), 154 png_fixed(png_ptr, green_X, "cHRM Green X"), 155 png_fixed(png_ptr, green_Y, "cHRM Green Y"), 156 png_fixed(png_ptr, green_Z, "cHRM Green Z"), 157 png_fixed(png_ptr, blue_X, "cHRM Blue X"), 158 png_fixed(png_ptr, blue_Y, "cHRM Blue Y"), 159 png_fixed(png_ptr, blue_Z, "cHRM Blue Z")); 160 } 161 # endif /* FLOATING_POINT */ 162 163 #endif /* cHRM */ 164 165 #ifdef PNG_gAMA_SUPPORTED 166 void PNGFAPI 167 png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr, 168 png_fixed_point file_gamma) 169 { 170 png_debug1(1, "in %s storage function", "gAMA"); 171 172 if (png_ptr == NULL || info_ptr == NULL) 173 return; 174 175 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma); 176 png_colorspace_sync_info(png_ptr, info_ptr); 177 } 178 179 # ifdef PNG_FLOATING_POINT_SUPPORTED 180 void PNGAPI 181 png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma) 182 { 183 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma, 184 "png_set_gAMA")); 185 } 186 # endif 187 #endif 188 189 #ifdef PNG_hIST_SUPPORTED 190 void PNGAPI 191 png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr, 192 png_const_uint_16p hist) 193 { 194 int i; 195 196 png_debug1(1, "in %s storage function", "hIST"); 197 198 if (png_ptr == NULL || info_ptr == NULL) 199 return; 200 201 if (info_ptr->num_palette == 0 || info_ptr->num_palette 202 > PNG_MAX_PALETTE_LENGTH) 203 { 204 png_warning(png_ptr, 205 "Invalid palette size, hIST allocation skipped"); 206 207 return; 208 } 209 210 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0); 211 212 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in 213 * version 1.2.1 214 */ 215 info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr, 216 PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16)))); 217 218 if (info_ptr->hist == NULL) 219 { 220 png_warning(png_ptr, "Insufficient memory for hIST chunk data"); 221 222 return; 223 } 224 225 info_ptr->free_me |= PNG_FREE_HIST; 226 227 for (i = 0; i < info_ptr->num_palette; i++) 228 info_ptr->hist[i] = hist[i]; 229 230 info_ptr->valid |= PNG_INFO_hIST; 231 } 232 #endif 233 234 void PNGAPI 235 png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr, 236 png_uint_32 width, png_uint_32 height, int bit_depth, 237 int color_type, int interlace_type, int compression_type, 238 int filter_type) 239 { 240 png_debug1(1, "in %s storage function", "IHDR"); 241 242 if (png_ptr == NULL || info_ptr == NULL) 243 return; 244 245 info_ptr->width = width; 246 info_ptr->height = height; 247 info_ptr->bit_depth = (png_byte)bit_depth; 248 info_ptr->color_type = (png_byte)color_type; 249 info_ptr->compression_type = (png_byte)compression_type; 250 info_ptr->filter_type = (png_byte)filter_type; 251 info_ptr->interlace_type = (png_byte)interlace_type; 252 253 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height, 254 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type, 255 info_ptr->compression_type, info_ptr->filter_type); 256 257 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 258 info_ptr->channels = 1; 259 260 else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0) 261 info_ptr->channels = 3; 262 263 else 264 info_ptr->channels = 1; 265 266 if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0) 267 info_ptr->channels++; 268 269 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth); 270 271 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width); 272 } 273 274 #ifdef PNG_oFFs_SUPPORTED 275 void PNGAPI 276 png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr, 277 png_int_32 offset_x, png_int_32 offset_y, int unit_type) 278 { 279 png_debug1(1, "in %s storage function", "oFFs"); 280 281 if (png_ptr == NULL || info_ptr == NULL) 282 return; 283 284 info_ptr->x_offset = offset_x; 285 info_ptr->y_offset = offset_y; 286 info_ptr->offset_unit_type = (png_byte)unit_type; 287 info_ptr->valid |= PNG_INFO_oFFs; 288 } 289 #endif 290 291 #ifdef PNG_pCAL_SUPPORTED 292 void PNGAPI 293 png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, 294 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, 295 int nparams, png_const_charp units, png_charpp params) 296 { 297 png_size_t length; 298 int i; 299 300 png_debug1(1, "in %s storage function", "pCAL"); 301 302 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL 303 || (nparams > 0 && params == NULL)) 304 return; 305 306 length = strlen(purpose) + 1; 307 png_debug1(3, "allocating purpose for info (%lu bytes)", 308 (unsigned long)length); 309 310 /* TODO: validate format of calibration name and unit name */ 311 312 /* Check that the type matches the specification. */ 313 if (type < 0 || type > 3) 314 png_error(png_ptr, "Invalid pCAL equation type"); 315 316 if (nparams < 0 || nparams > 255) 317 png_error(png_ptr, "Invalid pCAL parameter count"); 318 319 /* Validate params[nparams] */ 320 for (i=0; i<nparams; ++i) 321 { 322 if (params[i] == NULL || 323 !png_check_fp_string(params[i], strlen(params[i]))) 324 png_error(png_ptr, "Invalid format for pCAL parameter"); 325 } 326 327 info_ptr->pcal_purpose = png_voidcast(png_charp, 328 png_malloc_warn(png_ptr, length)); 329 330 if (info_ptr->pcal_purpose == NULL) 331 { 332 png_warning(png_ptr, "Insufficient memory for pCAL purpose"); 333 334 return; 335 } 336 337 memcpy(info_ptr->pcal_purpose, purpose, length); 338 339 png_debug(3, "storing X0, X1, type, and nparams in info"); 340 info_ptr->pcal_X0 = X0; 341 info_ptr->pcal_X1 = X1; 342 info_ptr->pcal_type = (png_byte)type; 343 info_ptr->pcal_nparams = (png_byte)nparams; 344 345 length = strlen(units) + 1; 346 png_debug1(3, "allocating units for info (%lu bytes)", 347 (unsigned long)length); 348 349 info_ptr->pcal_units = png_voidcast(png_charp, 350 png_malloc_warn(png_ptr, length)); 351 352 if (info_ptr->pcal_units == NULL) 353 { 354 png_warning(png_ptr, "Insufficient memory for pCAL units"); 355 356 return; 357 } 358 359 memcpy(info_ptr->pcal_units, units, length); 360 361 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr, 362 (png_size_t)((nparams + 1) * (sizeof (png_charp))))); 363 364 if (info_ptr->pcal_params == NULL) 365 { 366 png_warning(png_ptr, "Insufficient memory for pCAL params"); 367 368 return; 369 } 370 371 memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp))); 372 373 for (i = 0; i < nparams; i++) 374 { 375 length = strlen(params[i]) + 1; 376 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i, 377 (unsigned long)length); 378 379 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length); 380 381 if (info_ptr->pcal_params[i] == NULL) 382 { 383 png_warning(png_ptr, "Insufficient memory for pCAL parameter"); 384 385 return; 386 } 387 388 memcpy(info_ptr->pcal_params[i], params[i], length); 389 } 390 391 info_ptr->valid |= PNG_INFO_pCAL; 392 info_ptr->free_me |= PNG_FREE_PCAL; 393 } 394 #endif 395 396 #ifdef PNG_sCAL_SUPPORTED 397 void PNGAPI 398 png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr, 399 int unit, png_const_charp swidth, png_const_charp sheight) 400 { 401 png_size_t lengthw = 0, lengthh = 0; 402 403 png_debug1(1, "in %s storage function", "sCAL"); 404 405 if (png_ptr == NULL || info_ptr == NULL) 406 return; 407 408 /* Double check the unit (should never get here with an invalid 409 * unit unless this is an API call.) 410 */ 411 if (unit != 1 && unit != 2) 412 png_error(png_ptr, "Invalid sCAL unit"); 413 414 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 || 415 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw)) 416 png_error(png_ptr, "Invalid sCAL width"); 417 418 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 || 419 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh)) 420 png_error(png_ptr, "Invalid sCAL height"); 421 422 info_ptr->scal_unit = (png_byte)unit; 423 424 ++lengthw; 425 426 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw); 427 428 info_ptr->scal_s_width = png_voidcast(png_charp, 429 png_malloc_warn(png_ptr, lengthw)); 430 431 if (info_ptr->scal_s_width == NULL) 432 { 433 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); 434 435 return; 436 } 437 438 memcpy(info_ptr->scal_s_width, swidth, lengthw); 439 440 ++lengthh; 441 442 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh); 443 444 info_ptr->scal_s_height = png_voidcast(png_charp, 445 png_malloc_warn(png_ptr, lengthh)); 446 447 if (info_ptr->scal_s_height == NULL) 448 { 449 png_free (png_ptr, info_ptr->scal_s_width); 450 info_ptr->scal_s_width = NULL; 451 452 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); 453 454 return; 455 } 456 457 memcpy(info_ptr->scal_s_height, sheight, lengthh); 458 459 info_ptr->valid |= PNG_INFO_sCAL; 460 info_ptr->free_me |= PNG_FREE_SCAL; 461 } 462 463 # ifdef PNG_FLOATING_POINT_SUPPORTED 464 void PNGAPI 465 png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit, 466 double width, double height) 467 { 468 png_debug1(1, "in %s storage function", "sCAL"); 469 470 /* Check the arguments. */ 471 if (width <= 0) 472 png_warning(png_ptr, "Invalid sCAL width ignored"); 473 474 else if (height <= 0) 475 png_warning(png_ptr, "Invalid sCAL height ignored"); 476 477 else 478 { 479 /* Convert 'width' and 'height' to ASCII. */ 480 char swidth[PNG_sCAL_MAX_DIGITS+1]; 481 char sheight[PNG_sCAL_MAX_DIGITS+1]; 482 483 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width, 484 PNG_sCAL_PRECISION); 485 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height, 486 PNG_sCAL_PRECISION); 487 488 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); 489 } 490 } 491 # endif 492 493 # ifdef PNG_FIXED_POINT_SUPPORTED 494 void PNGAPI 495 png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit, 496 png_fixed_point width, png_fixed_point height) 497 { 498 png_debug1(1, "in %s storage function", "sCAL"); 499 500 /* Check the arguments. */ 501 if (width <= 0) 502 png_warning(png_ptr, "Invalid sCAL width ignored"); 503 504 else if (height <= 0) 505 png_warning(png_ptr, "Invalid sCAL height ignored"); 506 507 else 508 { 509 /* Convert 'width' and 'height' to ASCII. */ 510 char swidth[PNG_sCAL_MAX_DIGITS+1]; 511 char sheight[PNG_sCAL_MAX_DIGITS+1]; 512 513 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width); 514 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height); 515 516 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); 517 } 518 } 519 # endif 520 #endif 521 522 #ifdef PNG_pHYs_SUPPORTED 523 void PNGAPI 524 png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr, 525 png_uint_32 res_x, png_uint_32 res_y, int unit_type) 526 { 527 png_debug1(1, "in %s storage function", "pHYs"); 528 529 if (png_ptr == NULL || info_ptr == NULL) 530 return; 531 532 info_ptr->x_pixels_per_unit = res_x; 533 info_ptr->y_pixels_per_unit = res_y; 534 info_ptr->phys_unit_type = (png_byte)unit_type; 535 info_ptr->valid |= PNG_INFO_pHYs; 536 } 537 #endif 538 539 void PNGAPI 540 png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr, 541 png_const_colorp palette, int num_palette) 542 { 543 544 png_uint_32 max_palette_length; 545 546 png_debug1(1, "in %s storage function", "PLTE"); 547 548 if (png_ptr == NULL || info_ptr == NULL) 549 return; 550 551 max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ? 552 (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH; 553 554 if (num_palette < 0 || num_palette > (int) max_palette_length) 555 { 556 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 557 png_error(png_ptr, "Invalid palette length"); 558 559 else 560 { 561 png_warning(png_ptr, "Invalid palette length"); 562 563 return; 564 } 565 } 566 567 if ((num_palette > 0 && palette == NULL) || 568 (num_palette == 0 569 # ifdef PNG_MNG_FEATURES_SUPPORTED 570 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 571 # endif 572 )) 573 { 574 png_error(png_ptr, "Invalid palette"); 575 } 576 577 /* It may not actually be necessary to set png_ptr->palette here; 578 * we do it for backward compatibility with the way the png_handle_tRNS 579 * function used to do the allocation. 580 * 581 * 1.6.0: the above statement appears to be incorrect; something has to set 582 * the palette inside png_struct on read. 583 */ 584 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); 585 586 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead 587 * of num_palette entries, in case of an invalid PNG file or incorrect 588 * call to png_set_PLTE() with too-large sample values. 589 */ 590 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr, 591 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)))); 592 593 if (num_palette > 0) 594 memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color))); 595 info_ptr->palette = png_ptr->palette; 596 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; 597 598 info_ptr->free_me |= PNG_FREE_PLTE; 599 600 info_ptr->valid |= PNG_INFO_PLTE; 601 } 602 603 #ifdef PNG_sBIT_SUPPORTED 604 void PNGAPI 605 png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, 606 png_const_color_8p sig_bit) 607 { 608 png_debug1(1, "in %s storage function", "sBIT"); 609 610 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL) 611 return; 612 613 info_ptr->sig_bit = *sig_bit; 614 info_ptr->valid |= PNG_INFO_sBIT; 615 } 616 #endif 617 618 #ifdef PNG_sRGB_SUPPORTED 619 void PNGAPI 620 png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent) 621 { 622 png_debug1(1, "in %s storage function", "sRGB"); 623 624 if (png_ptr == NULL || info_ptr == NULL) 625 return; 626 627 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent); 628 png_colorspace_sync_info(png_ptr, info_ptr); 629 } 630 631 void PNGAPI 632 png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, 633 int srgb_intent) 634 { 635 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM"); 636 637 if (png_ptr == NULL || info_ptr == NULL) 638 return; 639 640 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, 641 srgb_intent) != 0) 642 { 643 /* This causes the gAMA and cHRM to be written too */ 644 info_ptr->colorspace.flags |= 645 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; 646 } 647 648 png_colorspace_sync_info(png_ptr, info_ptr); 649 } 650 #endif /* sRGB */ 651 652 653 #ifdef PNG_iCCP_SUPPORTED 654 void PNGAPI 655 png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr, 656 png_const_charp name, int compression_type, 657 png_const_bytep profile, png_uint_32 proflen) 658 { 659 png_charp new_iccp_name; 660 png_bytep new_iccp_profile; 661 png_size_t length; 662 663 png_debug1(1, "in %s storage function", "iCCP"); 664 665 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL) 666 return; 667 668 if (compression_type != PNG_COMPRESSION_TYPE_BASE) 669 png_app_error(png_ptr, "Invalid iCCP compression method"); 670 671 /* Set the colorspace first because this validates the profile; do not 672 * override previously set app cHRM or gAMA here (because likely as not the 673 * application knows better than libpng what the correct values are.) Pass 674 * the info_ptr color_type field to png_colorspace_set_ICC because in the 675 * write case it has not yet been stored in png_ptr. 676 */ 677 { 678 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name, 679 proflen, profile, info_ptr->color_type); 680 681 png_colorspace_sync_info(png_ptr, info_ptr); 682 683 /* Don't do any of the copying if the profile was bad, or inconsistent. */ 684 if (result == 0) 685 return; 686 687 /* But do write the gAMA and cHRM chunks from the profile. */ 688 info_ptr->colorspace.flags |= 689 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; 690 } 691 692 length = strlen(name)+1; 693 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length)); 694 695 if (new_iccp_name == NULL) 696 { 697 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk"); 698 699 return; 700 } 701 702 memcpy(new_iccp_name, name, length); 703 new_iccp_profile = png_voidcast(png_bytep, 704 png_malloc_warn(png_ptr, proflen)); 705 706 if (new_iccp_profile == NULL) 707 { 708 png_free(png_ptr, new_iccp_name); 709 png_benign_error(png_ptr, 710 "Insufficient memory to process iCCP profile"); 711 712 return; 713 } 714 715 memcpy(new_iccp_profile, profile, proflen); 716 717 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0); 718 719 info_ptr->iccp_proflen = proflen; 720 info_ptr->iccp_name = new_iccp_name; 721 info_ptr->iccp_profile = new_iccp_profile; 722 info_ptr->free_me |= PNG_FREE_ICCP; 723 info_ptr->valid |= PNG_INFO_iCCP; 724 } 725 #endif 726 727 #ifdef PNG_TEXT_SUPPORTED 728 void PNGAPI 729 png_set_text(png_const_structrp png_ptr, png_inforp info_ptr, 730 png_const_textp text_ptr, int num_text) 731 { 732 int ret; 733 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text); 734 735 if (ret != 0) 736 png_error(png_ptr, "Insufficient memory to store text"); 737 } 738 739 int /* PRIVATE */ 740 png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr, 741 png_const_textp text_ptr, int num_text) 742 { 743 int i; 744 745 png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U : 746 (unsigned long)png_ptr->chunk_name); 747 748 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL) 749 return(0); 750 751 /* Make sure we have enough space in the "text" array in info_struct 752 * to hold all of the incoming text_ptr objects. This compare can't overflow 753 * because max_text >= num_text (anyway, subtract of two positive integers 754 * can't overflow in any case.) 755 */ 756 if (num_text > info_ptr->max_text - info_ptr->num_text) 757 { 758 int old_num_text = info_ptr->num_text; 759 int max_text; 760 png_textp new_text = NULL; 761 762 /* Calculate an appropriate max_text, checking for overflow. */ 763 max_text = old_num_text; 764 if (num_text <= INT_MAX - max_text) 765 { 766 max_text += num_text; 767 768 /* Round up to a multiple of 8 */ 769 if (max_text < INT_MAX-8) 770 max_text = (max_text + 8) & ~0x7; 771 772 else 773 max_text = INT_MAX; 774 775 /* Now allocate a new array and copy the old members in; this does all 776 * the overflow checks. 777 */ 778 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr, 779 info_ptr->text, old_num_text, max_text-old_num_text, 780 sizeof *new_text)); 781 } 782 783 if (new_text == NULL) 784 { 785 png_chunk_report(png_ptr, "too many text chunks", 786 PNG_CHUNK_WRITE_ERROR); 787 788 return 1; 789 } 790 791 png_free(png_ptr, info_ptr->text); 792 793 info_ptr->text = new_text; 794 info_ptr->free_me |= PNG_FREE_TEXT; 795 info_ptr->max_text = max_text; 796 /* num_text is adjusted below as the entries are copied in */ 797 798 png_debug1(3, "allocated %d entries for info_ptr->text", max_text); 799 } 800 801 for (i = 0; i < num_text; i++) 802 { 803 size_t text_length, key_len; 804 size_t lang_len, lang_key_len; 805 png_textp textp = &(info_ptr->text[info_ptr->num_text]); 806 807 if (text_ptr[i].key == NULL) 808 continue; 809 810 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE || 811 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST) 812 { 813 png_chunk_report(png_ptr, "text compression mode is out of range", 814 PNG_CHUNK_WRITE_ERROR); 815 continue; 816 } 817 818 key_len = strlen(text_ptr[i].key); 819 820 if (text_ptr[i].compression <= 0) 821 { 822 lang_len = 0; 823 lang_key_len = 0; 824 } 825 826 else 827 # ifdef PNG_iTXt_SUPPORTED 828 { 829 /* Set iTXt data */ 830 831 if (text_ptr[i].lang != NULL) 832 lang_len = strlen(text_ptr[i].lang); 833 834 else 835 lang_len = 0; 836 837 if (text_ptr[i].lang_key != NULL) 838 lang_key_len = strlen(text_ptr[i].lang_key); 839 840 else 841 lang_key_len = 0; 842 } 843 # else /* iTXt */ 844 { 845 png_chunk_report(png_ptr, "iTXt chunk not supported", 846 PNG_CHUNK_WRITE_ERROR); 847 continue; 848 } 849 # endif 850 851 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0') 852 { 853 text_length = 0; 854 # ifdef PNG_iTXt_SUPPORTED 855 if (text_ptr[i].compression > 0) 856 textp->compression = PNG_ITXT_COMPRESSION_NONE; 857 858 else 859 # endif 860 textp->compression = PNG_TEXT_COMPRESSION_NONE; 861 } 862 863 else 864 { 865 text_length = strlen(text_ptr[i].text); 866 textp->compression = text_ptr[i].compression; 867 } 868 869 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr, 870 key_len + text_length + lang_len + lang_key_len + 4)); 871 872 if (textp->key == NULL) 873 { 874 png_chunk_report(png_ptr, "text chunk: out of memory", 875 PNG_CHUNK_WRITE_ERROR); 876 877 return 1; 878 } 879 880 png_debug2(2, "Allocated %lu bytes at %p in png_set_text", 881 (unsigned long)(png_uint_32) 882 (key_len + lang_len + lang_key_len + text_length + 4), 883 textp->key); 884 885 memcpy(textp->key, text_ptr[i].key, key_len); 886 *(textp->key + key_len) = '\0'; 887 888 if (text_ptr[i].compression > 0) 889 { 890 textp->lang = textp->key + key_len + 1; 891 memcpy(textp->lang, text_ptr[i].lang, lang_len); 892 *(textp->lang + lang_len) = '\0'; 893 textp->lang_key = textp->lang + lang_len + 1; 894 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); 895 *(textp->lang_key + lang_key_len) = '\0'; 896 textp->text = textp->lang_key + lang_key_len + 1; 897 } 898 899 else 900 { 901 textp->lang=NULL; 902 textp->lang_key=NULL; 903 textp->text = textp->key + key_len + 1; 904 } 905 906 if (text_length != 0) 907 memcpy(textp->text, text_ptr[i].text, text_length); 908 909 *(textp->text + text_length) = '\0'; 910 911 # ifdef PNG_iTXt_SUPPORTED 912 if (textp->compression > 0) 913 { 914 textp->text_length = 0; 915 textp->itxt_length = text_length; 916 } 917 918 else 919 # endif 920 { 921 textp->text_length = text_length; 922 textp->itxt_length = 0; 923 } 924 925 info_ptr->num_text++; 926 png_debug1(3, "transferred text chunk %d", info_ptr->num_text); 927 } 928 929 return(0); 930 } 931 #endif 932 933 #ifdef PNG_tIME_SUPPORTED 934 void PNGAPI 935 png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr, 936 png_const_timep mod_time) 937 { 938 png_debug1(1, "in %s storage function", "tIME"); 939 940 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL || 941 (png_ptr->mode & PNG_WROTE_tIME) != 0) 942 return; 943 944 if (mod_time->month == 0 || mod_time->month > 12 || 945 mod_time->day == 0 || mod_time->day > 31 || 946 mod_time->hour > 23 || mod_time->minute > 59 || 947 mod_time->second > 60) 948 { 949 png_warning(png_ptr, "Ignoring invalid time value"); 950 951 return; 952 } 953 954 info_ptr->mod_time = *mod_time; 955 info_ptr->valid |= PNG_INFO_tIME; 956 } 957 #endif 958 959 #ifdef PNG_tRNS_SUPPORTED 960 void PNGAPI 961 png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr, 962 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color) 963 { 964 png_debug1(1, "in %s storage function", "tRNS"); 965 966 if (png_ptr == NULL || info_ptr == NULL) 967 968 return; 969 970 if (trans_alpha != NULL) 971 { 972 /* It may not actually be necessary to set png_ptr->trans_alpha here; 973 * we do it for backward compatibility with the way the png_handle_tRNS 974 * function used to do the allocation. 975 * 976 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively 977 * relies on png_set_tRNS storing the information in png_struct 978 * (otherwise it won't be there for the code in pngrtran.c). 979 */ 980 981 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0); 982 983 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH) 984 { 985 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */ 986 info_ptr->trans_alpha = png_voidcast(png_bytep, 987 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH)); 988 memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans); 989 } 990 png_ptr->trans_alpha = info_ptr->trans_alpha; 991 } 992 993 if (trans_color != NULL) 994 { 995 #ifdef PNG_WARNINGS_SUPPORTED 996 if (info_ptr->bit_depth < 16) 997 { 998 int sample_max = (1 << info_ptr->bit_depth) - 1; 999 1000 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY && 1001 trans_color->gray > sample_max) || 1002 (info_ptr->color_type == PNG_COLOR_TYPE_RGB && 1003 (trans_color->red > sample_max || 1004 trans_color->green > sample_max || 1005 trans_color->blue > sample_max))) 1006 png_warning(png_ptr, 1007 "tRNS chunk has out-of-range samples for bit_depth"); 1008 } 1009 #endif 1010 1011 info_ptr->trans_color = *trans_color; 1012 1013 if (num_trans == 0) 1014 num_trans = 1; 1015 } 1016 1017 info_ptr->num_trans = (png_uint_16)num_trans; 1018 1019 if (num_trans != 0) 1020 { 1021 info_ptr->valid |= PNG_INFO_tRNS; 1022 info_ptr->free_me |= PNG_FREE_TRNS; 1023 } 1024 } 1025 #endif 1026 1027 #ifdef PNG_sPLT_SUPPORTED 1028 void PNGAPI 1029 png_set_sPLT(png_const_structrp png_ptr, 1030 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries) 1031 /* 1032 * entries - array of png_sPLT_t structures 1033 * to be added to the list of palettes 1034 * in the info structure. 1035 * 1036 * nentries - number of palette structures to be 1037 * added. 1038 */ 1039 { 1040 png_sPLT_tp np; 1041 1042 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL) 1043 return; 1044 1045 /* Use the internal realloc function, which checks for all the possible 1046 * overflows. Notice that the parameters are (int) and (size_t) 1047 */ 1048 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr, 1049 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries, 1050 sizeof *np)); 1051 1052 if (np == NULL) 1053 { 1054 /* Out of memory or too many chunks */ 1055 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR); 1056 1057 return; 1058 } 1059 1060 png_free(png_ptr, info_ptr->splt_palettes); 1061 info_ptr->splt_palettes = np; 1062 info_ptr->free_me |= PNG_FREE_SPLT; 1063 1064 np += info_ptr->splt_palettes_num; 1065 1066 do 1067 { 1068 png_size_t length; 1069 1070 /* Skip invalid input entries */ 1071 if (entries->name == NULL || entries->entries == NULL) 1072 { 1073 /* png_handle_sPLT doesn't do this, so this is an app error */ 1074 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT"); 1075 /* Just skip the invalid entry */ 1076 continue; 1077 } 1078 1079 np->depth = entries->depth; 1080 1081 /* In the event of out-of-memory just return - there's no point keeping 1082 * on trying to add sPLT chunks. 1083 */ 1084 length = strlen(entries->name) + 1; 1085 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length)); 1086 1087 if (np->name == NULL) 1088 break; 1089 1090 memcpy(np->name, entries->name, length); 1091 1092 /* IMPORTANT: we have memory now that won't get freed if something else 1093 * goes wrong; this code must free it. png_malloc_array produces no 1094 * warnings; use a png_chunk_report (below) if there is an error. 1095 */ 1096 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr, 1097 entries->nentries, sizeof (png_sPLT_entry))); 1098 1099 if (np->entries == NULL) 1100 { 1101 png_free(png_ptr, np->name); 1102 np->name = NULL; 1103 break; 1104 } 1105 1106 np->nentries = entries->nentries; 1107 /* This multiply can't overflow because png_malloc_array has already 1108 * checked it when doing the allocation. 1109 */ 1110 memcpy(np->entries, entries->entries, 1111 entries->nentries * sizeof (png_sPLT_entry)); 1112 1113 /* Note that 'continue' skips the advance of the out pointer and out 1114 * count, so an invalid entry is not added. 1115 */ 1116 info_ptr->valid |= PNG_INFO_sPLT; 1117 ++(info_ptr->splt_palettes_num); 1118 ++np; 1119 } 1120 while (++entries, --nentries); 1121 1122 if (nentries > 0) 1123 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR); 1124 } 1125 #endif /* sPLT */ 1126 1127 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED 1128 static png_byte 1129 check_location(png_const_structrp png_ptr, int location) 1130 { 1131 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT); 1132 1133 /* New in 1.6.0; copy the location and check it. This is an API 1134 * change; previously the app had to use the 1135 * png_set_unknown_chunk_location API below for each chunk. 1136 */ 1137 if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0) 1138 { 1139 /* Write struct, so unknown chunks come from the app */ 1140 png_app_warning(png_ptr, 1141 "png_set_unknown_chunks now expects a valid location"); 1142 /* Use the old behavior */ 1143 location = (png_byte)(png_ptr->mode & 1144 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)); 1145 } 1146 1147 /* This need not be an internal error - if the app calls 1148 * png_set_unknown_chunks on a read pointer it must get the location right. 1149 */ 1150 if (location == 0) 1151 png_error(png_ptr, "invalid location in png_set_unknown_chunks"); 1152 1153 /* Now reduce the location to the top-most set bit by removing each least 1154 * significant bit in turn. 1155 */ 1156 while (location != (location & -location)) 1157 location &= ~(location & -location); 1158 1159 /* The cast is safe because 'location' is a bit mask and only the low four 1160 * bits are significant. 1161 */ 1162 return (png_byte)location; 1163 } 1164 1165 void PNGAPI 1166 png_set_unknown_chunks(png_const_structrp png_ptr, 1167 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns) 1168 { 1169 png_unknown_chunkp np; 1170 1171 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 || 1172 unknowns == NULL) 1173 return; 1174 1175 /* Check for the failure cases where support has been disabled at compile 1176 * time. This code is hardly ever compiled - it's here because 1177 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this 1178 * code) but may be meaningless if the read or write handling of unknown 1179 * chunks is not compiled in. 1180 */ 1181 # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \ 1182 defined(PNG_READ_SUPPORTED) 1183 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0) 1184 { 1185 png_app_error(png_ptr, "no unknown chunk support on read"); 1186 1187 return; 1188 } 1189 # endif 1190 # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \ 1191 defined(PNG_WRITE_SUPPORTED) 1192 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0) 1193 { 1194 png_app_error(png_ptr, "no unknown chunk support on write"); 1195 1196 return; 1197 } 1198 # endif 1199 1200 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that 1201 * unknown critical chunks could be lost with just a warning resulting in 1202 * undefined behavior. Now png_chunk_report is used to provide behavior 1203 * appropriate to read or write. 1204 */ 1205 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr, 1206 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns, 1207 sizeof *np)); 1208 1209 if (np == NULL) 1210 { 1211 png_chunk_report(png_ptr, "too many unknown chunks", 1212 PNG_CHUNK_WRITE_ERROR); 1213 1214 return; 1215 } 1216 1217 png_free(png_ptr, info_ptr->unknown_chunks); 1218 info_ptr->unknown_chunks = np; /* safe because it is initialized */ 1219 info_ptr->free_me |= PNG_FREE_UNKN; 1220 1221 np += info_ptr->unknown_chunks_num; 1222 1223 /* Increment unknown_chunks_num each time round the loop to protect the 1224 * just-allocated chunk data. 1225 */ 1226 for (; num_unknowns > 0; --num_unknowns, ++unknowns) 1227 { 1228 memcpy(np->name, unknowns->name, (sizeof np->name)); 1229 np->name[(sizeof np->name)-1] = '\0'; 1230 np->location = check_location(png_ptr, unknowns->location); 1231 1232 if (unknowns->size == 0) 1233 { 1234 np->data = NULL; 1235 np->size = 0; 1236 } 1237 1238 else 1239 { 1240 np->data = png_voidcast(png_bytep, 1241 png_malloc_base(png_ptr, unknowns->size)); 1242 1243 if (np->data == NULL) 1244 { 1245 png_chunk_report(png_ptr, "unknown chunk: out of memory", 1246 PNG_CHUNK_WRITE_ERROR); 1247 /* But just skip storing the unknown chunk */ 1248 continue; 1249 } 1250 1251 memcpy(np->data, unknowns->data, unknowns->size); 1252 np->size = unknowns->size; 1253 } 1254 1255 /* These increments are skipped on out-of-memory for the data - the 1256 * unknown chunk entry gets overwritten if the png_chunk_report returns. 1257 * This is correct in the read case (the chunk is just dropped.) 1258 */ 1259 ++np; 1260 ++(info_ptr->unknown_chunks_num); 1261 } 1262 } 1263 1264 void PNGAPI 1265 png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr, 1266 int chunk, int location) 1267 { 1268 /* This API is pretty pointless in 1.6.0 because the location can be set 1269 * before the call to png_set_unknown_chunks. 1270 * 1271 * TODO: add a png_app_warning in 1.7 1272 */ 1273 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && 1274 chunk < info_ptr->unknown_chunks_num) 1275 { 1276 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0) 1277 { 1278 png_app_error(png_ptr, "invalid unknown chunk location"); 1279 /* Fake out the pre 1.6.0 behavior: */ 1280 if ((location & PNG_HAVE_IDAT) != 0) /* undocumented! */ 1281 location = PNG_AFTER_IDAT; 1282 1283 else 1284 location = PNG_HAVE_IHDR; /* also undocumented */ 1285 } 1286 1287 info_ptr->unknown_chunks[chunk].location = 1288 check_location(png_ptr, location); 1289 } 1290 } 1291 #endif /* STORE_UNKNOWN_CHUNKS */ 1292 1293 #ifdef PNG_MNG_FEATURES_SUPPORTED 1294 png_uint_32 PNGAPI 1295 png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features) 1296 { 1297 png_debug(1, "in png_permit_mng_features"); 1298 1299 if (png_ptr == NULL) 1300 return 0; 1301 1302 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES; 1303 1304 return png_ptr->mng_features_permitted; 1305 } 1306 #endif 1307 1308 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 1309 static unsigned int 1310 add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep) 1311 { 1312 unsigned int i; 1313 1314 /* Utility function: update the 'keep' state of a chunk if it is already in 1315 * the list, otherwise add it to the list. 1316 */ 1317 for (i=0; i<count; ++i, list += 5) 1318 { 1319 if (memcmp(list, add, 4) == 0) 1320 { 1321 list[4] = (png_byte)keep; 1322 1323 return count; 1324 } 1325 } 1326 1327 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT) 1328 { 1329 ++count; 1330 memcpy(list, add, 4); 1331 list[4] = (png_byte)keep; 1332 } 1333 1334 return count; 1335 } 1336 1337 void PNGAPI 1338 png_set_keep_unknown_chunks(png_structrp png_ptr, int keep, 1339 png_const_bytep chunk_list, int num_chunks_in) 1340 { 1341 png_bytep new_list; 1342 unsigned int num_chunks, old_num_chunks; 1343 1344 if (png_ptr == NULL) 1345 return; 1346 1347 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST) 1348 { 1349 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep"); 1350 1351 return; 1352 } 1353 1354 if (num_chunks_in <= 0) 1355 { 1356 png_ptr->unknown_default = keep; 1357 1358 /* '0' means just set the flags, so stop here */ 1359 if (num_chunks_in == 0) 1360 return; 1361 } 1362 1363 if (num_chunks_in < 0) 1364 { 1365 /* Ignore all unknown chunks and all chunks recognized by 1366 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND 1367 */ 1368 static PNG_CONST png_byte chunks_to_ignore[] = { 1369 98, 75, 71, 68, '\0', /* bKGD */ 1370 99, 72, 82, 77, '\0', /* cHRM */ 1371 103, 65, 77, 65, '\0', /* gAMA */ 1372 104, 73, 83, 84, '\0', /* hIST */ 1373 105, 67, 67, 80, '\0', /* iCCP */ 1374 105, 84, 88, 116, '\0', /* iTXt */ 1375 111, 70, 70, 115, '\0', /* oFFs */ 1376 112, 67, 65, 76, '\0', /* pCAL */ 1377 112, 72, 89, 115, '\0', /* pHYs */ 1378 115, 66, 73, 84, '\0', /* sBIT */ 1379 115, 67, 65, 76, '\0', /* sCAL */ 1380 115, 80, 76, 84, '\0', /* sPLT */ 1381 115, 84, 69, 82, '\0', /* sTER */ 1382 115, 82, 71, 66, '\0', /* sRGB */ 1383 116, 69, 88, 116, '\0', /* tEXt */ 1384 116, 73, 77, 69, '\0', /* tIME */ 1385 122, 84, 88, 116, '\0' /* zTXt */ 1386 }; 1387 1388 chunk_list = chunks_to_ignore; 1389 num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U; 1390 } 1391 1392 else /* num_chunks_in > 0 */ 1393 { 1394 if (chunk_list == NULL) 1395 { 1396 /* Prior to 1.6.0 this was silently ignored, now it is an app_error 1397 * which can be switched off. 1398 */ 1399 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list"); 1400 1401 return; 1402 } 1403 1404 num_chunks = num_chunks_in; 1405 } 1406 1407 old_num_chunks = png_ptr->num_chunk_list; 1408 if (png_ptr->chunk_list == NULL) 1409 old_num_chunks = 0; 1410 1411 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow. 1412 */ 1413 if (num_chunks + old_num_chunks > UINT_MAX/5) 1414 { 1415 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks"); 1416 1417 return; 1418 } 1419 1420 /* If these chunks are being reset to the default then no more memory is 1421 * required because add_one_chunk above doesn't extend the list if the 'keep' 1422 * parameter is the default. 1423 */ 1424 if (keep != 0) 1425 { 1426 new_list = png_voidcast(png_bytep, png_malloc(png_ptr, 1427 5 * (num_chunks + old_num_chunks))); 1428 1429 if (old_num_chunks > 0) 1430 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks); 1431 } 1432 1433 else if (old_num_chunks > 0) 1434 new_list = png_ptr->chunk_list; 1435 1436 else 1437 new_list = NULL; 1438 1439 /* Add the new chunks together with each one's handling code. If the chunk 1440 * already exists the code is updated, otherwise the chunk is added to the 1441 * end. (In libpng 1.6.0 order no longer matters because this code enforces 1442 * the earlier convention that the last setting is the one that is used.) 1443 */ 1444 if (new_list != NULL) 1445 { 1446 png_const_bytep inlist; 1447 png_bytep outlist; 1448 unsigned int i; 1449 1450 for (i=0; i<num_chunks; ++i) 1451 { 1452 old_num_chunks = add_one_chunk(new_list, old_num_chunks, 1453 chunk_list+5*i, keep); 1454 } 1455 1456 /* Now remove any spurious 'default' entries. */ 1457 num_chunks = 0; 1458 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5) 1459 { 1460 if (inlist[4]) 1461 { 1462 if (outlist != inlist) 1463 memcpy(outlist, inlist, 5); 1464 outlist += 5; 1465 ++num_chunks; 1466 } 1467 } 1468 1469 /* This means the application has removed all the specialized handling. */ 1470 if (num_chunks == 0) 1471 { 1472 if (png_ptr->chunk_list != new_list) 1473 png_free(png_ptr, new_list); 1474 1475 new_list = NULL; 1476 } 1477 } 1478 1479 else 1480 num_chunks = 0; 1481 1482 png_ptr->num_chunk_list = num_chunks; 1483 1484 if (png_ptr->chunk_list != new_list) 1485 { 1486 if (png_ptr->chunk_list != NULL) 1487 png_free(png_ptr, png_ptr->chunk_list); 1488 1489 png_ptr->chunk_list = new_list; 1490 } 1491 } 1492 #endif 1493 1494 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED 1495 void PNGAPI 1496 png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr, 1497 png_user_chunk_ptr read_user_chunk_fn) 1498 { 1499 png_debug(1, "in png_set_read_user_chunk_fn"); 1500 1501 if (png_ptr == NULL) 1502 return; 1503 1504 png_ptr->read_user_chunk_fn = read_user_chunk_fn; 1505 png_ptr->user_chunk_ptr = user_chunk_ptr; 1506 } 1507 #endif 1508 1509 #ifdef PNG_INFO_IMAGE_SUPPORTED 1510 void PNGAPI 1511 png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr, 1512 png_bytepp row_pointers) 1513 { 1514 png_debug1(1, "in %s storage function", "rows"); 1515 1516 if (png_ptr == NULL || info_ptr == NULL) 1517 return; 1518 1519 if (info_ptr->row_pointers != NULL && 1520 (info_ptr->row_pointers != row_pointers)) 1521 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); 1522 1523 info_ptr->row_pointers = row_pointers; 1524 1525 if (row_pointers != NULL) 1526 info_ptr->valid |= PNG_INFO_IDAT; 1527 } 1528 #endif 1529 1530 void PNGAPI 1531 png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size) 1532 { 1533 if (png_ptr == NULL) 1534 return; 1535 1536 if (size == 0 || size > PNG_UINT_31_MAX) 1537 png_error(png_ptr, "invalid compression buffer size"); 1538 1539 # ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1540 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0) 1541 { 1542 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */ 1543 return; 1544 } 1545 # endif 1546 1547 # ifdef PNG_WRITE_SUPPORTED 1548 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0) 1549 { 1550 if (png_ptr->zowner != 0) 1551 { 1552 png_warning(png_ptr, 1553 "Compression buffer size cannot be changed because it is in use"); 1554 1555 return; 1556 } 1557 1558 #ifndef __COVERITY__ 1559 /* Some compilers complain that this is always false. However, it 1560 * can be true when integer overflow happens. 1561 */ 1562 if (size > ZLIB_IO_MAX) 1563 { 1564 png_warning(png_ptr, 1565 "Compression buffer size limited to system maximum"); 1566 size = ZLIB_IO_MAX; /* must fit */ 1567 } 1568 #endif 1569 1570 if (size < 6) 1571 { 1572 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH 1573 * if this is permitted. 1574 */ 1575 png_warning(png_ptr, 1576 "Compression buffer size cannot be reduced below 6"); 1577 1578 return; 1579 } 1580 1581 if (png_ptr->zbuffer_size != size) 1582 { 1583 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list); 1584 png_ptr->zbuffer_size = (uInt)size; 1585 } 1586 } 1587 # endif 1588 } 1589 1590 void PNGAPI 1591 png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask) 1592 { 1593 if (png_ptr != NULL && info_ptr != NULL) 1594 info_ptr->valid &= ~mask; 1595 } 1596 1597 1598 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 1599 /* This function was added to libpng 1.2.6 */ 1600 void PNGAPI 1601 png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max, 1602 png_uint_32 user_height_max) 1603 { 1604 /* Images with dimensions larger than these limits will be 1605 * rejected by png_set_IHDR(). To accept any PNG datastream 1606 * regardless of dimensions, set both limits to 0x7fffffff. 1607 */ 1608 if (png_ptr == NULL) 1609 return; 1610 1611 png_ptr->user_width_max = user_width_max; 1612 png_ptr->user_height_max = user_height_max; 1613 } 1614 1615 /* This function was added to libpng 1.4.0 */ 1616 void PNGAPI 1617 png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max) 1618 { 1619 if (png_ptr != NULL) 1620 png_ptr->user_chunk_cache_max = user_chunk_cache_max; 1621 } 1622 1623 /* This function was added to libpng 1.4.1 */ 1624 void PNGAPI 1625 png_set_chunk_malloc_max (png_structrp png_ptr, 1626 png_alloc_size_t user_chunk_malloc_max) 1627 { 1628 if (png_ptr != NULL) 1629 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max; 1630 } 1631 #endif /* ?SET_USER_LIMITS */ 1632 1633 1634 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1635 void PNGAPI 1636 png_set_benign_errors(png_structrp png_ptr, int allowed) 1637 { 1638 png_debug(1, "in png_set_benign_errors"); 1639 1640 /* If allowed is 1, png_benign_error() is treated as a warning. 1641 * 1642 * If allowed is 0, png_benign_error() is treated as an error (which 1643 * is the default behavior if png_set_benign_errors() is not called). 1644 */ 1645 1646 if (allowed != 0) 1647 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN | 1648 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN; 1649 1650 else 1651 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN | 1652 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN); 1653 } 1654 #endif /* BENIGN_ERRORS */ 1655 1656 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED 1657 /* Whether to report invalid palette index; added at libng-1.5.10. 1658 * It is possible for an indexed (color-type==3) PNG file to contain 1659 * pixels with invalid (out-of-range) indexes if the PLTE chunk has 1660 * fewer entries than the image's bit-depth would allow. We recover 1661 * from this gracefully by filling any incomplete palette with zeros 1662 * (opaque black). By default, when this occurs libpng will issue 1663 * a benign error. This API can be used to override that behavior. 1664 */ 1665 void PNGAPI 1666 png_set_check_for_invalid_index(png_structrp png_ptr, int allowed) 1667 { 1668 png_debug(1, "in png_set_check_for_invalid_index"); 1669 1670 if (allowed > 0) 1671 png_ptr->num_palette_max = 0; 1672 1673 else 1674 png_ptr->num_palette_max = -1; 1675 } 1676 #endif 1677 1678 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) || \ 1679 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 1680 /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification, 1681 * and if invalid, correct the keyword rather than discarding the entire 1682 * chunk. The PNG 1.0 specification requires keywords 1-79 characters in 1683 * length, forbids leading or trailing whitespace, multiple internal spaces, 1684 * and the non-break space (0x80) from ISO 8859-1. Returns keyword length. 1685 * 1686 * The 'new_key' buffer must be 80 characters in size (for the keyword plus a 1687 * trailing '\0'). If this routine returns 0 then there was no keyword, or a 1688 * valid one could not be generated, and the caller must png_error. 1689 */ 1690 png_uint_32 /* PRIVATE */ 1691 png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key) 1692 { 1693 png_const_charp orig_key = key; 1694 png_uint_32 key_len = 0; 1695 int bad_character = 0; 1696 int space = 1; 1697 1698 png_debug(1, "in png_check_keyword"); 1699 1700 if (key == NULL) 1701 { 1702 *new_key = 0; 1703 return 0; 1704 } 1705 1706 while (*key && key_len < 79) 1707 { 1708 png_byte ch = (png_byte)*key++; 1709 1710 if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/)) 1711 *new_key++ = ch, ++key_len, space = 0; 1712 1713 else if (space == 0) 1714 { 1715 /* A space or an invalid character when one wasn't seen immediately 1716 * before; output just a space. 1717 */ 1718 *new_key++ = 32, ++key_len, space = 1; 1719 1720 /* If the character was not a space then it is invalid. */ 1721 if (ch != 32) 1722 bad_character = ch; 1723 } 1724 1725 else if (bad_character == 0) 1726 bad_character = ch; /* just skip it, record the first error */ 1727 } 1728 1729 if (key_len > 0 && space != 0) /* trailing space */ 1730 { 1731 --key_len, --new_key; 1732 if (bad_character == 0) 1733 bad_character = 32; 1734 } 1735 1736 /* Terminate the keyword */ 1737 *new_key = 0; 1738 1739 if (key_len == 0) 1740 return 0; 1741 1742 #ifdef PNG_WARNINGS_SUPPORTED 1743 /* Try to only output one warning per keyword: */ 1744 if (*key != 0) /* keyword too long */ 1745 png_warning(png_ptr, "keyword truncated"); 1746 1747 else if (bad_character != 0) 1748 { 1749 PNG_WARNING_PARAMETERS(p) 1750 1751 png_warning_parameter(p, 1, orig_key); 1752 png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character); 1753 1754 png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'"); 1755 } 1756 #endif /* WARNINGS */ 1757 1758 return key_len; 1759 } 1760 #endif /* TEXT || pCAL || iCCP || sPLT */ 1761 #endif /* READ || WRITE */ --- EOF ---