pngset.c revision 0640679f04398a7d06319d5c47b0f71bf82854a0
1 2/* pngset.c - storage of image information into info struct 3 * 4 * Last changed in libpng 1.2.27 [April 29, 2008] 5 * For conditions of distribution and use, see copyright notice in png.h 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 9 * 10 * The functions here are used during reads to store data from the file 11 * into the info struct, and during writes to store application data 12 * into the info struct for writing into the file. This abstracts the 13 * info struct and allows us to change the structure in the future. 14 */ 15 16#define PNG_INTERNAL 17#include "png.h" 18 19#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) 20 21#if defined(PNG_bKGD_SUPPORTED) 22void PNGAPI 23png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background) 24{ 25 png_debug1(1, "in %s storage function\n", "bKGD"); 26 if (png_ptr == NULL || info_ptr == NULL) 27 return; 28 29 png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16)); 30 info_ptr->valid |= PNG_INFO_bKGD; 31} 32#endif 33 34#if defined(PNG_cHRM_SUPPORTED) 35#ifdef PNG_FLOATING_POINT_SUPPORTED 36void PNGAPI 37png_set_cHRM(png_structp png_ptr, png_infop info_ptr, 38 double white_x, double white_y, double red_x, double red_y, 39 double green_x, double green_y, double blue_x, double blue_y) 40{ 41 png_debug1(1, "in %s storage function\n", "cHRM"); 42 if (png_ptr == NULL || info_ptr == NULL) 43 return; 44 if (!(white_x || white_y || red_x || red_y || green_x || green_y || 45 blue_x || blue_y)) 46 { 47 png_warning(png_ptr, 48 "Ignoring attempt to set all-zero chromaticity values"); 49 return; 50 } 51 if (white_x < 0.0 || white_y < 0.0 || 52 red_x < 0.0 || red_y < 0.0 || 53 green_x < 0.0 || green_y < 0.0 || 54 blue_x < 0.0 || blue_y < 0.0) 55 { 56 png_warning(png_ptr, 57 "Ignoring attempt to set negative chromaticity value"); 58 return; 59 } 60 if (white_x > 21474.83 || white_y > 21474.83 || 61 red_x > 21474.83 || red_y > 21474.83 || 62 green_x > 21474.83 || green_y > 21474.83 || 63 blue_x > 21474.83 || blue_y > 21474.83) 64 { 65 png_warning(png_ptr, 66 "Ignoring attempt to set chromaticity value exceeding 21474.83"); 67 return; 68 } 69 70 info_ptr->x_white = (float)white_x; 71 info_ptr->y_white = (float)white_y; 72 info_ptr->x_red = (float)red_x; 73 info_ptr->y_red = (float)red_y; 74 info_ptr->x_green = (float)green_x; 75 info_ptr->y_green = (float)green_y; 76 info_ptr->x_blue = (float)blue_x; 77 info_ptr->y_blue = (float)blue_y; 78#ifdef PNG_FIXED_POINT_SUPPORTED 79 info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5); 80 info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5); 81 info_ptr->int_x_red = (png_fixed_point)( red_x*100000.+0.5); 82 info_ptr->int_y_red = (png_fixed_point)( red_y*100000.+0.5); 83 info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5); 84 info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5); 85 info_ptr->int_x_blue = (png_fixed_point)( blue_x*100000.+0.5); 86 info_ptr->int_y_blue = (png_fixed_point)( blue_y*100000.+0.5); 87#endif 88 info_ptr->valid |= PNG_INFO_cHRM; 89} 90#endif 91#ifdef PNG_FIXED_POINT_SUPPORTED 92void PNGAPI 93png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr, 94 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, 95 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, 96 png_fixed_point blue_x, png_fixed_point blue_y) 97{ 98 png_debug1(1, "in %s storage function\n", "cHRM"); 99 if (png_ptr == NULL || info_ptr == NULL) 100 return; 101 102 if (!(white_x || white_y || red_x || red_y || green_x || green_y || 103 blue_x || blue_y)) 104 { 105 png_warning(png_ptr, 106 "Ignoring attempt to set all-zero chromaticity values"); 107 return; 108 } 109 if (white_x < 0 || white_y < 0 || 110 red_x < 0 || red_y < 0 || 111 green_x < 0 || green_y < 0 || 112 blue_x < 0 || blue_y < 0) 113 { 114 png_warning(png_ptr, 115 "Ignoring attempt to set negative chromaticity value"); 116 return; 117 } 118 if (white_x > (png_fixed_point) PNG_UINT_31_MAX || 119 white_y > (png_fixed_point) PNG_UINT_31_MAX || 120 red_x > (png_fixed_point) PNG_UINT_31_MAX || 121 red_y > (png_fixed_point) PNG_UINT_31_MAX || 122 green_x > (png_fixed_point) PNG_UINT_31_MAX || 123 green_y > (png_fixed_point) PNG_UINT_31_MAX || 124 blue_x > (png_fixed_point) PNG_UINT_31_MAX || 125 blue_y > (png_fixed_point) PNG_UINT_31_MAX ) 126 { 127 png_warning(png_ptr, 128 "Ignoring attempt to set chromaticity value exceeding 21474.83"); 129 return; 130 } 131 info_ptr->int_x_white = white_x; 132 info_ptr->int_y_white = white_y; 133 info_ptr->int_x_red = red_x; 134 info_ptr->int_y_red = red_y; 135 info_ptr->int_x_green = green_x; 136 info_ptr->int_y_green = green_y; 137 info_ptr->int_x_blue = blue_x; 138 info_ptr->int_y_blue = blue_y; 139#ifdef PNG_FLOATING_POINT_SUPPORTED 140 info_ptr->x_white = (float)(white_x/100000.); 141 info_ptr->y_white = (float)(white_y/100000.); 142 info_ptr->x_red = (float)( red_x/100000.); 143 info_ptr->y_red = (float)( red_y/100000.); 144 info_ptr->x_green = (float)(green_x/100000.); 145 info_ptr->y_green = (float)(green_y/100000.); 146 info_ptr->x_blue = (float)( blue_x/100000.); 147 info_ptr->y_blue = (float)( blue_y/100000.); 148#endif 149 info_ptr->valid |= PNG_INFO_cHRM; 150} 151#endif 152#endif 153 154#if defined(PNG_gAMA_SUPPORTED) 155#ifdef PNG_FLOATING_POINT_SUPPORTED 156void PNGAPI 157png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma) 158{ 159 double gamma; 160 png_debug1(1, "in %s storage function\n", "gAMA"); 161 if (png_ptr == NULL || info_ptr == NULL) 162 return; 163 164 /* Check for overflow */ 165 if (file_gamma > 21474.83) 166 { 167 png_warning(png_ptr, "Limiting gamma to 21474.83"); 168 gamma=21474.83; 169 } 170 else 171 gamma=file_gamma; 172 info_ptr->gamma = (float)gamma; 173#ifdef PNG_FIXED_POINT_SUPPORTED 174 info_ptr->int_gamma = (int)(gamma*100000.+.5); 175#endif 176 info_ptr->valid |= PNG_INFO_gAMA; 177 if(gamma == 0.0) 178 png_warning(png_ptr, "Setting gamma=0"); 179} 180#endif 181void PNGAPI 182png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point 183 int_gamma) 184{ 185 png_fixed_point gamma; 186 187 png_debug1(1, "in %s storage function\n", "gAMA"); 188 if (png_ptr == NULL || info_ptr == NULL) 189 return; 190 191 if (int_gamma > (png_fixed_point) PNG_UINT_31_MAX) 192 { 193 png_warning(png_ptr, "Limiting gamma to 21474.83"); 194 gamma=PNG_UINT_31_MAX; 195 } 196 else 197 { 198 if (int_gamma < 0) 199 { 200 png_warning(png_ptr, "Setting negative gamma to zero"); 201 gamma=0; 202 } 203 else 204 gamma=int_gamma; 205 } 206#ifdef PNG_FLOATING_POINT_SUPPORTED 207 info_ptr->gamma = (float)(gamma/100000.); 208#endif 209#ifdef PNG_FIXED_POINT_SUPPORTED 210 info_ptr->int_gamma = gamma; 211#endif 212 info_ptr->valid |= PNG_INFO_gAMA; 213 if(gamma == 0) 214 png_warning(png_ptr, "Setting gamma=0"); 215} 216#endif 217 218#if defined(PNG_hIST_SUPPORTED) 219void PNGAPI 220png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist) 221{ 222 int i; 223 224 png_debug1(1, "in %s storage function\n", "hIST"); 225 if (png_ptr == NULL || info_ptr == NULL) 226 return; 227 if (info_ptr->num_palette == 0 || info_ptr->num_palette 228 > PNG_MAX_PALETTE_LENGTH) 229 { 230 png_warning(png_ptr, 231 "Invalid palette size, hIST allocation skipped."); 232 return; 233 } 234 235#ifdef PNG_FREE_ME_SUPPORTED 236 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0); 237#endif 238 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in version 239 1.2.1 */ 240 png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr, 241 (png_uint_32)(PNG_MAX_PALETTE_LENGTH * png_sizeof (png_uint_16))); 242 if (png_ptr->hist == NULL) 243 { 244 png_warning(png_ptr, "Insufficient memory for hIST chunk data."); 245 return; 246 } 247 248 for (i = 0; i < info_ptr->num_palette; i++) 249 png_ptr->hist[i] = hist[i]; 250 info_ptr->hist = png_ptr->hist; 251 info_ptr->valid |= PNG_INFO_hIST; 252 253#ifdef PNG_FREE_ME_SUPPORTED 254 info_ptr->free_me |= PNG_FREE_HIST; 255#else 256 png_ptr->flags |= PNG_FLAG_FREE_HIST; 257#endif 258} 259#endif 260 261void PNGAPI 262png_set_IHDR(png_structp png_ptr, png_infop info_ptr, 263 png_uint_32 width, png_uint_32 height, int bit_depth, 264 int color_type, int interlace_type, int compression_type, 265 int filter_type) 266{ 267 png_debug1(1, "in %s storage function\n", "IHDR"); 268 if (png_ptr == NULL || info_ptr == NULL) 269 return; 270 271 /* check for width and height valid values */ 272 if (width == 0 || height == 0) 273 png_error(png_ptr, "Image width or height is zero in IHDR"); 274#ifdef PNG_SET_USER_LIMITS_SUPPORTED 275 if (width > png_ptr->user_width_max || height > png_ptr->user_height_max) 276 png_error(png_ptr, "image size exceeds user limits in IHDR"); 277#else 278 if (width > PNG_USER_WIDTH_MAX || height > PNG_USER_HEIGHT_MAX) 279 png_error(png_ptr, "image size exceeds user limits in IHDR"); 280#endif 281 if (width > PNG_UINT_31_MAX || height > PNG_UINT_31_MAX) 282 png_error(png_ptr, "Invalid image size in IHDR"); 283 if ( width > (PNG_UINT_32_MAX 284 >> 3) /* 8-byte RGBA pixels */ 285 - 64 /* bigrowbuf hack */ 286 - 1 /* filter byte */ 287 - 7*8 /* rounding of width to multiple of 8 pixels */ 288 - 8) /* extra max_pixel_depth pad */ 289 png_warning(png_ptr, "Width is too large for libpng to process pixels"); 290 291 /* check other values */ 292 if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 && 293 bit_depth != 8 && bit_depth != 16) 294 png_error(png_ptr, "Invalid bit depth in IHDR"); 295 296 if (color_type < 0 || color_type == 1 || 297 color_type == 5 || color_type > 6) 298 png_error(png_ptr, "Invalid color type in IHDR"); 299 300 if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) || 301 ((color_type == PNG_COLOR_TYPE_RGB || 302 color_type == PNG_COLOR_TYPE_GRAY_ALPHA || 303 color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8)) 304 png_error(png_ptr, "Invalid color type/bit depth combination in IHDR"); 305 306 if (interlace_type >= PNG_INTERLACE_LAST) 307 png_error(png_ptr, "Unknown interlace method in IHDR"); 308 309 if (compression_type != PNG_COMPRESSION_TYPE_BASE) 310 png_error(png_ptr, "Unknown compression method in IHDR"); 311 312#if defined(PNG_MNG_FEATURES_SUPPORTED) 313 /* Accept filter_method 64 (intrapixel differencing) only if 314 * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and 315 * 2. Libpng did not read a PNG signature (this filter_method is only 316 * used in PNG datastreams that are embedded in MNG datastreams) and 317 * 3. The application called png_permit_mng_features with a mask that 318 * included PNG_FLAG_MNG_FILTER_64 and 319 * 4. The filter_method is 64 and 320 * 5. The color_type is RGB or RGBA 321 */ 322 if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted) 323 png_warning(png_ptr,"MNG features are not allowed in a PNG datastream"); 324 if(filter_type != PNG_FILTER_TYPE_BASE) 325 { 326 if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && 327 (filter_type == PNG_INTRAPIXEL_DIFFERENCING) && 328 ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) && 329 (color_type == PNG_COLOR_TYPE_RGB || 330 color_type == PNG_COLOR_TYPE_RGB_ALPHA))) 331 png_error(png_ptr, "Unknown filter method in IHDR"); 332 if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) 333 png_warning(png_ptr, "Invalid filter method in IHDR"); 334 } 335#else 336 if(filter_type != PNG_FILTER_TYPE_BASE) 337 png_error(png_ptr, "Unknown filter method in IHDR"); 338#endif 339 340 info_ptr->width = width; 341 info_ptr->height = height; 342 info_ptr->bit_depth = (png_byte)bit_depth; 343 info_ptr->color_type =(png_byte) color_type; 344 info_ptr->compression_type = (png_byte)compression_type; 345 info_ptr->filter_type = (png_byte)filter_type; 346 info_ptr->interlace_type = (png_byte)interlace_type; 347 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 348 info_ptr->channels = 1; 349 else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR) 350 info_ptr->channels = 3; 351 else 352 info_ptr->channels = 1; 353 if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA) 354 info_ptr->channels++; 355 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth); 356 357 /* check for potential overflow */ 358 if (width > (PNG_UINT_32_MAX 359 >> 3) /* 8-byte RGBA pixels */ 360 - 64 /* bigrowbuf hack */ 361 - 1 /* filter byte */ 362 - 7*8 /* rounding of width to multiple of 8 pixels */ 363 - 8) /* extra max_pixel_depth pad */ 364 info_ptr->rowbytes = (png_size_t)0; 365 else 366 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth,width); 367} 368 369#if defined(PNG_oFFs_SUPPORTED) 370void PNGAPI 371png_set_oFFs(png_structp png_ptr, png_infop info_ptr, 372 png_int_32 offset_x, png_int_32 offset_y, int unit_type) 373{ 374 png_debug1(1, "in %s storage function\n", "oFFs"); 375 if (png_ptr == NULL || info_ptr == NULL) 376 return; 377 378 info_ptr->x_offset = offset_x; 379 info_ptr->y_offset = offset_y; 380 info_ptr->offset_unit_type = (png_byte)unit_type; 381 info_ptr->valid |= PNG_INFO_oFFs; 382} 383#endif 384 385#if defined(PNG_pCAL_SUPPORTED) 386void PNGAPI 387png_set_pCAL(png_structp png_ptr, png_infop info_ptr, 388 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 389 png_charp units, png_charpp params) 390{ 391 png_uint_32 length; 392 int i; 393 394 png_debug1(1, "in %s storage function\n", "pCAL"); 395 if (png_ptr == NULL || info_ptr == NULL) 396 return; 397 398 length = png_strlen(purpose) + 1; 399 png_debug1(3, "allocating purpose for info (%lu bytes)\n", length); 400 info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length); 401 if (info_ptr->pcal_purpose == NULL) 402 { 403 png_warning(png_ptr, "Insufficient memory for pCAL purpose."); 404 return; 405 } 406 png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length); 407 408 png_debug(3, "storing X0, X1, type, and nparams in info\n"); 409 info_ptr->pcal_X0 = X0; 410 info_ptr->pcal_X1 = X1; 411 info_ptr->pcal_type = (png_byte)type; 412 info_ptr->pcal_nparams = (png_byte)nparams; 413 414 length = png_strlen(units) + 1; 415 png_debug1(3, "allocating units for info (%lu bytes)\n", length); 416 info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length); 417 if (info_ptr->pcal_units == NULL) 418 { 419 png_warning(png_ptr, "Insufficient memory for pCAL units."); 420 return; 421 } 422 png_memcpy(info_ptr->pcal_units, units, (png_size_t)length); 423 424 info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr, 425 (png_uint_32)((nparams + 1) * png_sizeof(png_charp))); 426 if (info_ptr->pcal_params == NULL) 427 { 428 png_warning(png_ptr, "Insufficient memory for pCAL params."); 429 return; 430 } 431 432 info_ptr->pcal_params[nparams] = NULL; 433 434 for (i = 0; i < nparams; i++) 435 { 436 length = png_strlen(params[i]) + 1; 437 png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length); 438 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length); 439 if (info_ptr->pcal_params[i] == NULL) 440 { 441 png_warning(png_ptr, "Insufficient memory for pCAL parameter."); 442 return; 443 } 444 png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length); 445 } 446 447 info_ptr->valid |= PNG_INFO_pCAL; 448#ifdef PNG_FREE_ME_SUPPORTED 449 info_ptr->free_me |= PNG_FREE_PCAL; 450#endif 451} 452#endif 453 454#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED) 455#ifdef PNG_FLOATING_POINT_SUPPORTED 456void PNGAPI 457png_set_sCAL(png_structp png_ptr, png_infop info_ptr, 458 int unit, double width, double height) 459{ 460 png_debug1(1, "in %s storage function\n", "sCAL"); 461 if (png_ptr == NULL || info_ptr == NULL) 462 return; 463 464 info_ptr->scal_unit = (png_byte)unit; 465 info_ptr->scal_pixel_width = width; 466 info_ptr->scal_pixel_height = height; 467 468 info_ptr->valid |= PNG_INFO_sCAL; 469} 470#else 471#ifdef PNG_FIXED_POINT_SUPPORTED 472void PNGAPI 473png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr, 474 int unit, png_charp swidth, png_charp sheight) 475{ 476 png_uint_32 length; 477 478 png_debug1(1, "in %s storage function\n", "sCAL"); 479 if (png_ptr == NULL || info_ptr == NULL) 480 return; 481 482 info_ptr->scal_unit = (png_byte)unit; 483 484 length = png_strlen(swidth) + 1; 485 png_debug1(3, "allocating unit for info (%d bytes)\n", length); 486 info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length); 487 if (info_ptr->scal_s_width == NULL) 488 { 489 png_warning(png_ptr, 490 "Memory allocation failed while processing sCAL."); 491 return; 492 } 493 png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length); 494 495 length = png_strlen(sheight) + 1; 496 png_debug1(3, "allocating unit for info (%d bytes)\n", length); 497 info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length); 498 if (info_ptr->scal_s_height == NULL) 499 { 500 png_free (png_ptr, info_ptr->scal_s_width); 501 png_warning(png_ptr, 502 "Memory allocation failed while processing sCAL."); 503 return; 504 } 505 png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length); 506 info_ptr->valid |= PNG_INFO_sCAL; 507#ifdef PNG_FREE_ME_SUPPORTED 508 info_ptr->free_me |= PNG_FREE_SCAL; 509#endif 510} 511#endif 512#endif 513#endif 514 515#if defined(PNG_pHYs_SUPPORTED) 516void PNGAPI 517png_set_pHYs(png_structp png_ptr, png_infop info_ptr, 518 png_uint_32 res_x, png_uint_32 res_y, int unit_type) 519{ 520 png_debug1(1, "in %s storage function\n", "pHYs"); 521 if (png_ptr == NULL || info_ptr == NULL) 522 return; 523 524 info_ptr->x_pixels_per_unit = res_x; 525 info_ptr->y_pixels_per_unit = res_y; 526 info_ptr->phys_unit_type = (png_byte)unit_type; 527 info_ptr->valid |= PNG_INFO_pHYs; 528} 529#endif 530 531void PNGAPI 532png_set_PLTE(png_structp png_ptr, png_infop info_ptr, 533 png_colorp palette, int num_palette) 534{ 535 536 png_debug1(1, "in %s storage function\n", "PLTE"); 537 if (png_ptr == NULL || info_ptr == NULL) 538 return; 539 540 if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH) 541 { 542 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 543 png_error(png_ptr, "Invalid palette length"); 544 else 545 { 546 png_warning(png_ptr, "Invalid palette length"); 547 return; 548 } 549 } 550 551 /* 552 * It may not actually be necessary to set png_ptr->palette here; 553 * we do it for backward compatibility with the way the png_handle_tRNS 554 * function used to do the allocation. 555 */ 556#ifdef PNG_FREE_ME_SUPPORTED 557 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); 558#endif 559 560 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead 561 of num_palette entries, 562 in case of an invalid PNG file that has too-large sample values. */ 563 png_ptr->palette = (png_colorp)png_malloc(png_ptr, 564 PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color)); 565 png_memset(png_ptr->palette, 0, PNG_MAX_PALETTE_LENGTH * 566 png_sizeof(png_color)); 567 png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof (png_color)); 568 info_ptr->palette = png_ptr->palette; 569 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; 570 571#ifdef PNG_FREE_ME_SUPPORTED 572 info_ptr->free_me |= PNG_FREE_PLTE; 573#else 574 png_ptr->flags |= PNG_FLAG_FREE_PLTE; 575#endif 576 577 info_ptr->valid |= PNG_INFO_PLTE; 578} 579 580#if defined(PNG_sBIT_SUPPORTED) 581void PNGAPI 582png_set_sBIT(png_structp png_ptr, png_infop info_ptr, 583 png_color_8p sig_bit) 584{ 585 png_debug1(1, "in %s storage function\n", "sBIT"); 586 if (png_ptr == NULL || info_ptr == NULL) 587 return; 588 589 png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof (png_color_8)); 590 info_ptr->valid |= PNG_INFO_sBIT; 591} 592#endif 593 594#if defined(PNG_sRGB_SUPPORTED) 595void PNGAPI 596png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent) 597{ 598 png_debug1(1, "in %s storage function\n", "sRGB"); 599 if (png_ptr == NULL || info_ptr == NULL) 600 return; 601 602 info_ptr->srgb_intent = (png_byte)intent; 603 info_ptr->valid |= PNG_INFO_sRGB; 604} 605 606void PNGAPI 607png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr, 608 int intent) 609{ 610#if defined(PNG_gAMA_SUPPORTED) 611#ifdef PNG_FLOATING_POINT_SUPPORTED 612 float file_gamma; 613#endif 614#ifdef PNG_FIXED_POINT_SUPPORTED 615 png_fixed_point int_file_gamma; 616#endif 617#endif 618#if defined(PNG_cHRM_SUPPORTED) 619#ifdef PNG_FLOATING_POINT_SUPPORTED 620 float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y; 621#endif 622#ifdef PNG_FIXED_POINT_SUPPORTED 623 png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, 624 int_green_y, int_blue_x, int_blue_y; 625#endif 626#endif 627 png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM"); 628 if (png_ptr == NULL || info_ptr == NULL) 629 return; 630 631 png_set_sRGB(png_ptr, info_ptr, intent); 632 633#if defined(PNG_gAMA_SUPPORTED) 634#ifdef PNG_FLOATING_POINT_SUPPORTED 635 file_gamma = (float).45455; 636 png_set_gAMA(png_ptr, info_ptr, file_gamma); 637#endif 638#ifdef PNG_FIXED_POINT_SUPPORTED 639 int_file_gamma = 45455L; 640 png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma); 641#endif 642#endif 643 644#if defined(PNG_cHRM_SUPPORTED) 645#ifdef PNG_FIXED_POINT_SUPPORTED 646 int_white_x = 31270L; 647 int_white_y = 32900L; 648 int_red_x = 64000L; 649 int_red_y = 33000L; 650 int_green_x = 30000L; 651 int_green_y = 60000L; 652 int_blue_x = 15000L; 653 int_blue_y = 6000L; 654 655 png_set_cHRM_fixed(png_ptr, info_ptr, 656 int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y, 657 int_blue_x, int_blue_y); 658#endif 659#ifdef PNG_FLOATING_POINT_SUPPORTED 660 white_x = (float).3127; 661 white_y = (float).3290; 662 red_x = (float).64; 663 red_y = (float).33; 664 green_x = (float).30; 665 green_y = (float).60; 666 blue_x = (float).15; 667 blue_y = (float).06; 668 669 png_set_cHRM(png_ptr, info_ptr, 670 white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y); 671#endif 672#endif 673} 674#endif 675 676 677#if defined(PNG_iCCP_SUPPORTED) 678void PNGAPI 679png_set_iCCP(png_structp png_ptr, png_infop info_ptr, 680 png_charp name, int compression_type, 681 png_charp profile, png_uint_32 proflen) 682{ 683 png_charp new_iccp_name; 684 png_charp new_iccp_profile; 685 png_uint_32 length; 686 687 png_debug1(1, "in %s storage function\n", "iCCP"); 688 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL) 689 return; 690 691 length = png_strlen(name)+1; 692 new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length); 693 if (new_iccp_name == NULL) 694 { 695 png_warning(png_ptr, "Insufficient memory to process iCCP chunk."); 696 return; 697 } 698 png_memcpy(new_iccp_name, name, length); 699 new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen); 700 if (new_iccp_profile == NULL) 701 { 702 png_free (png_ptr, new_iccp_name); 703 png_warning(png_ptr, "Insufficient memory to process iCCP profile."); 704 return; 705 } 706 png_memcpy(new_iccp_profile, profile, (png_size_t)proflen); 707 708 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0); 709 710 info_ptr->iccp_proflen = proflen; 711 info_ptr->iccp_name = new_iccp_name; 712 info_ptr->iccp_profile = new_iccp_profile; 713 /* Compression is always zero but is here so the API and info structure 714 * does not have to change if we introduce multiple compression types */ 715 info_ptr->iccp_compression = (png_byte)compression_type; 716#ifdef PNG_FREE_ME_SUPPORTED 717 info_ptr->free_me |= PNG_FREE_ICCP; 718#endif 719 info_ptr->valid |= PNG_INFO_iCCP; 720} 721#endif 722 723#if defined(PNG_TEXT_SUPPORTED) 724void PNGAPI 725png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr, 726 int num_text) 727{ 728 int ret; 729 ret=png_set_text_2(png_ptr, info_ptr, text_ptr, num_text); 730 if (ret) 731 png_error(png_ptr, "Insufficient memory to store text"); 732} 733 734int /* PRIVATE */ 735png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr, 736 int num_text) 737{ 738 int i; 739 740 png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ? 741 "text" : (png_const_charp)png_ptr->chunk_name)); 742 743 if (png_ptr == NULL || info_ptr == NULL || num_text == 0) 744 return(0); 745 746 /* Make sure we have enough space in the "text" array in info_struct 747 * to hold all of the incoming text_ptr objects. 748 */ 749 if (info_ptr->num_text + num_text > info_ptr->max_text) 750 { 751 if (info_ptr->text != NULL) 752 { 753 png_textp old_text; 754 int old_max; 755 756 old_max = info_ptr->max_text; 757 info_ptr->max_text = info_ptr->num_text + num_text + 8; 758 old_text = info_ptr->text; 759 info_ptr->text = (png_textp)png_malloc_warn(png_ptr, 760 (png_uint_32)(info_ptr->max_text * png_sizeof (png_text))); 761 if (info_ptr->text == NULL) 762 { 763 png_free(png_ptr, old_text); 764 return(1); 765 } 766 png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max * 767 png_sizeof(png_text))); 768 png_free(png_ptr, old_text); 769 } 770 else 771 { 772 info_ptr->max_text = num_text + 8; 773 info_ptr->num_text = 0; 774 info_ptr->text = (png_textp)png_malloc_warn(png_ptr, 775 (png_uint_32)(info_ptr->max_text * png_sizeof (png_text))); 776 if (info_ptr->text == NULL) 777 return(1); 778#ifdef PNG_FREE_ME_SUPPORTED 779 info_ptr->free_me |= PNG_FREE_TEXT; 780#endif 781 } 782 png_debug1(3, "allocated %d entries for info_ptr->text\n", 783 info_ptr->max_text); 784 } 785 for (i = 0; i < num_text; i++) 786 { 787 png_size_t text_length,key_len; 788 png_size_t lang_len,lang_key_len; 789 png_textp textp = &(info_ptr->text[info_ptr->num_text]); 790 791 if (text_ptr[i].key == NULL) 792 continue; 793 794 key_len = png_strlen(text_ptr[i].key); 795 796 if(text_ptr[i].compression <= 0) 797 { 798 lang_len = 0; 799 lang_key_len = 0; 800 } 801 else 802#ifdef PNG_iTXt_SUPPORTED 803 { 804 /* set iTXt data */ 805 if (text_ptr[i].lang != NULL) 806 lang_len = png_strlen(text_ptr[i].lang); 807 else 808 lang_len = 0; 809 if (text_ptr[i].lang_key != NULL) 810 lang_key_len = png_strlen(text_ptr[i].lang_key); 811 else 812 lang_key_len = 0; 813 } 814#else 815 { 816 png_warning(png_ptr, "iTXt chunk not supported."); 817 continue; 818 } 819#endif 820 821 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0') 822 { 823 text_length = 0; 824#ifdef PNG_iTXt_SUPPORTED 825 if(text_ptr[i].compression > 0) 826 textp->compression = PNG_ITXT_COMPRESSION_NONE; 827 else 828#endif 829 textp->compression = PNG_TEXT_COMPRESSION_NONE; 830 } 831 else 832 { 833 text_length = png_strlen(text_ptr[i].text); 834 textp->compression = text_ptr[i].compression; 835 } 836 837 textp->key = (png_charp)png_malloc_warn(png_ptr, 838 (png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4)); 839 if (textp->key == NULL) 840 return(1); 841 png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n", 842 (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4), 843 (int)textp->key); 844 845 png_memcpy(textp->key, text_ptr[i].key, 846 (png_size_t)(key_len)); 847 *(textp->key+key_len) = '\0'; 848#ifdef PNG_iTXt_SUPPORTED 849 if (text_ptr[i].compression > 0) 850 { 851 textp->lang=textp->key + key_len + 1; 852 png_memcpy(textp->lang, text_ptr[i].lang, lang_len); 853 *(textp->lang+lang_len) = '\0'; 854 textp->lang_key=textp->lang + lang_len + 1; 855 png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); 856 *(textp->lang_key+lang_key_len) = '\0'; 857 textp->text=textp->lang_key + lang_key_len + 1; 858 } 859 else 860#endif 861 { 862#ifdef PNG_iTXt_SUPPORTED 863 textp->lang=NULL; 864 textp->lang_key=NULL; 865#endif 866 textp->text=textp->key + key_len + 1; 867 } 868 if(text_length) 869 png_memcpy(textp->text, text_ptr[i].text, 870 (png_size_t)(text_length)); 871 *(textp->text+text_length) = '\0'; 872 873#ifdef PNG_iTXt_SUPPORTED 874 if(textp->compression > 0) 875 { 876 textp->text_length = 0; 877 textp->itxt_length = text_length; 878 } 879 else 880#endif 881 { 882 textp->text_length = text_length; 883#ifdef PNG_iTXt_SUPPORTED 884 textp->itxt_length = 0; 885#endif 886 } 887 info_ptr->num_text++; 888 png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text); 889 } 890 return(0); 891} 892#endif 893 894#if defined(PNG_tIME_SUPPORTED) 895void PNGAPI 896png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time) 897{ 898 png_debug1(1, "in %s storage function\n", "tIME"); 899 if (png_ptr == NULL || info_ptr == NULL || 900 (png_ptr->mode & PNG_WROTE_tIME)) 901 return; 902 903 png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof (png_time)); 904 info_ptr->valid |= PNG_INFO_tIME; 905} 906#endif 907 908#if defined(PNG_tRNS_SUPPORTED) 909void PNGAPI 910png_set_tRNS(png_structp png_ptr, png_infop info_ptr, 911 png_bytep trans, int num_trans, png_color_16p trans_values) 912{ 913 png_debug1(1, "in %s storage function\n", "tRNS"); 914 if (png_ptr == NULL || info_ptr == NULL) 915 return; 916 917 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0); 918 919 if (trans != NULL) 920 { 921 /* 922 * It may not actually be necessary to set png_ptr->trans here; 923 * we do it for backward compatibility with the way the png_handle_tRNS 924 * function used to do the allocation. 925 */ 926 927 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */ 928 png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr, 929 (png_uint_32)PNG_MAX_PALETTE_LENGTH); 930 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH) 931 png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans); 932 } 933 934 if (trans_values != NULL) 935 { 936 int sample_max = (1 << info_ptr->bit_depth); 937 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY && 938 (int)trans_values->gray > sample_max) || 939 (info_ptr->color_type == PNG_COLOR_TYPE_RGB && 940 ((int)trans_values->red > sample_max || 941 (int)trans_values->green > sample_max || 942 (int)trans_values->blue > sample_max))) 943 png_warning(png_ptr, 944 "tRNS chunk has out-of-range samples for bit_depth"); 945 png_memcpy(&(info_ptr->trans_values), trans_values, 946 png_sizeof(png_color_16)); 947 if (num_trans == 0) 948 num_trans = 1; 949 } 950 951 info_ptr->num_trans = (png_uint_16)num_trans; 952 if (num_trans != 0) 953 { 954 info_ptr->valid |= PNG_INFO_tRNS; 955#ifdef PNG_FREE_ME_SUPPORTED 956 info_ptr->free_me |= PNG_FREE_TRNS; 957#else 958 png_ptr->flags |= PNG_FLAG_FREE_TRNS; 959#endif 960 } 961} 962#endif 963 964#if defined(PNG_sPLT_SUPPORTED) 965void PNGAPI 966png_set_sPLT(png_structp png_ptr, 967 png_infop info_ptr, png_sPLT_tp entries, int nentries) 968{ 969 png_sPLT_tp np; 970 int i; 971 972 if (png_ptr == NULL || info_ptr == NULL) 973 return; 974 975 np = (png_sPLT_tp)png_malloc_warn(png_ptr, 976 (info_ptr->splt_palettes_num + nentries) * png_sizeof(png_sPLT_t)); 977 if (np == NULL) 978 { 979 png_warning(png_ptr, "No memory for sPLT palettes."); 980 return; 981 } 982 983 png_memcpy(np, info_ptr->splt_palettes, 984 info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t)); 985 png_free(png_ptr, info_ptr->splt_palettes); 986 info_ptr->splt_palettes=NULL; 987 988 for (i = 0; i < nentries; i++) 989 { 990 png_sPLT_tp to = np + info_ptr->splt_palettes_num + i; 991 png_sPLT_tp from = entries + i; 992 png_uint_32 length; 993 994 length = png_strlen(from->name) + 1; 995 to->name = (png_charp)png_malloc_warn(png_ptr, length); 996 if (to->name == NULL) 997 { 998 png_warning(png_ptr, 999 "Out of memory while processing sPLT chunk"); 1000 continue; 1001 } 1002 png_memcpy(to->name, from->name, length); 1003 to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr, 1004 from->nentries * png_sizeof(png_sPLT_entry)); 1005 if (to->entries == NULL) 1006 { 1007 png_warning(png_ptr, 1008 "Out of memory while processing sPLT chunk"); 1009 png_free(png_ptr,to->name); 1010 to->name = NULL; 1011 continue; 1012 } 1013 png_memcpy(to->entries, from->entries, 1014 from->nentries * png_sizeof(png_sPLT_entry)); 1015 to->nentries = from->nentries; 1016 to->depth = from->depth; 1017 } 1018 1019 info_ptr->splt_palettes = np; 1020 info_ptr->splt_palettes_num += nentries; 1021 info_ptr->valid |= PNG_INFO_sPLT; 1022#ifdef PNG_FREE_ME_SUPPORTED 1023 info_ptr->free_me |= PNG_FREE_SPLT; 1024#endif 1025} 1026#endif /* PNG_sPLT_SUPPORTED */ 1027 1028#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1029void PNGAPI 1030png_set_unknown_chunks(png_structp png_ptr, 1031 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns) 1032{ 1033 png_unknown_chunkp np; 1034 int i; 1035 1036 if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0) 1037 return; 1038 1039 np = (png_unknown_chunkp)png_malloc_warn(png_ptr, 1040 (info_ptr->unknown_chunks_num + num_unknowns) * 1041 png_sizeof(png_unknown_chunk)); 1042 if (np == NULL) 1043 { 1044 png_warning(png_ptr, 1045 "Out of memory while processing unknown chunk."); 1046 return; 1047 } 1048 1049 png_memcpy(np, info_ptr->unknown_chunks, 1050 info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk)); 1051 png_free(png_ptr, info_ptr->unknown_chunks); 1052 info_ptr->unknown_chunks=NULL; 1053 1054 for (i = 0; i < num_unknowns; i++) 1055 { 1056 png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i; 1057 png_unknown_chunkp from = unknowns + i; 1058 1059 png_memcpy((png_charp)to->name, 1060 (png_charp)from->name, 1061 png_sizeof(from->name)); 1062 to->name[png_sizeof(to->name)-1] = '\0'; 1063 to->size = from->size; 1064 /* note our location in the read or write sequence */ 1065 to->location = (png_byte)(png_ptr->mode & 0xff); 1066 1067 if (from->size == 0) 1068 to->data=NULL; 1069 else 1070 { 1071 to->data = (png_bytep)png_malloc_warn(png_ptr, from->size); 1072 if (to->data == NULL) 1073 { 1074 png_warning(png_ptr, 1075 "Out of memory while processing unknown chunk."); 1076 to->size=0; 1077 } 1078 else 1079 png_memcpy(to->data, from->data, from->size); 1080 } 1081 } 1082 1083 info_ptr->unknown_chunks = np; 1084 info_ptr->unknown_chunks_num += num_unknowns; 1085#ifdef PNG_FREE_ME_SUPPORTED 1086 info_ptr->free_me |= PNG_FREE_UNKN; 1087#endif 1088} 1089void PNGAPI 1090png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr, 1091 int chunk, int location) 1092{ 1093 if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk < 1094 (int)info_ptr->unknown_chunks_num) 1095 info_ptr->unknown_chunks[chunk].location = (png_byte)location; 1096} 1097#endif 1098 1099#if defined(PNG_1_0_X) || defined(PNG_1_2_X) 1100#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1101 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1102void PNGAPI 1103png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted) 1104{ 1105 /* This function is deprecated in favor of png_permit_mng_features() 1106 and will be removed from libpng-1.3.0 */ 1107 png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n"); 1108 if (png_ptr == NULL) 1109 return; 1110 png_ptr->mng_features_permitted = (png_byte) 1111 ((png_ptr->mng_features_permitted & (~PNG_FLAG_MNG_EMPTY_PLTE)) | 1112 ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE))); 1113} 1114#endif 1115#endif 1116 1117#if defined(PNG_MNG_FEATURES_SUPPORTED) 1118png_uint_32 PNGAPI 1119png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features) 1120{ 1121 png_debug(1, "in png_permit_mng_features\n"); 1122 if (png_ptr == NULL) 1123 return (png_uint_32)0; 1124 png_ptr->mng_features_permitted = 1125 (png_byte)(mng_features & PNG_ALL_MNG_FEATURES); 1126 return (png_uint_32)png_ptr->mng_features_permitted; 1127} 1128#endif 1129 1130#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1131void PNGAPI 1132png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep 1133 chunk_list, int num_chunks) 1134{ 1135 png_bytep new_list, p; 1136 int i, old_num_chunks; 1137 if (png_ptr == NULL) 1138 return; 1139 if (num_chunks == 0) 1140 { 1141 if(keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE) 1142 png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS; 1143 else 1144 png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS; 1145 1146 if(keep == PNG_HANDLE_CHUNK_ALWAYS) 1147 png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS; 1148 else 1149 png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS; 1150 return; 1151 } 1152 if (chunk_list == NULL) 1153 return; 1154 old_num_chunks=png_ptr->num_chunk_list; 1155 new_list=(png_bytep)png_malloc(png_ptr, 1156 (png_uint_32)(5*(num_chunks+old_num_chunks))); 1157 if(png_ptr->chunk_list != NULL) 1158 { 1159 png_memcpy(new_list, png_ptr->chunk_list, 1160 (png_size_t)(5*old_num_chunks)); 1161 png_free(png_ptr, png_ptr->chunk_list); 1162 png_ptr->chunk_list=NULL; 1163 } 1164 png_memcpy(new_list+5*old_num_chunks, chunk_list, 1165 (png_size_t)(5*num_chunks)); 1166 for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5) 1167 *p=(png_byte)keep; 1168 png_ptr->num_chunk_list=old_num_chunks+num_chunks; 1169 png_ptr->chunk_list=new_list; 1170#ifdef PNG_FREE_ME_SUPPORTED 1171 png_ptr->free_me |= PNG_FREE_LIST; 1172#endif 1173} 1174#endif 1175 1176#if defined(PNG_READ_USER_CHUNKS_SUPPORTED) 1177void PNGAPI 1178png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr, 1179 png_user_chunk_ptr read_user_chunk_fn) 1180{ 1181 png_debug(1, "in png_set_read_user_chunk_fn\n"); 1182 if (png_ptr == NULL) 1183 return; 1184 png_ptr->read_user_chunk_fn = read_user_chunk_fn; 1185 png_ptr->user_chunk_ptr = user_chunk_ptr; 1186} 1187#endif 1188 1189#if defined(PNG_INFO_IMAGE_SUPPORTED) 1190void PNGAPI 1191png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers) 1192{ 1193 png_debug1(1, "in %s storage function\n", "rows"); 1194 1195 if (png_ptr == NULL || info_ptr == NULL) 1196 return; 1197 1198 if(info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers)) 1199 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); 1200 info_ptr->row_pointers = row_pointers; 1201 if(row_pointers) 1202 info_ptr->valid |= PNG_INFO_IDAT; 1203} 1204#endif 1205 1206#ifdef PNG_WRITE_SUPPORTED 1207void PNGAPI 1208png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size) 1209{ 1210 if (png_ptr == NULL) 1211 return; 1212 png_free(png_ptr, png_ptr->zbuf); 1213 png_ptr->zbuf_size = (png_size_t)size; 1214 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size); 1215 png_ptr->zstream.next_out = png_ptr->zbuf; 1216 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; 1217} 1218#endif 1219 1220void PNGAPI 1221png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask) 1222{ 1223 if (png_ptr && info_ptr) 1224 info_ptr->valid &= ~mask; 1225} 1226 1227 1228#ifndef PNG_1_0_X 1229#ifdef PNG_ASSEMBLER_CODE_SUPPORTED 1230/* function was added to libpng 1.2.0 and should always exist by default */ 1231void PNGAPI 1232png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags) 1233{ 1234/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */ 1235 if (png_ptr != NULL) 1236 png_ptr->asm_flags = 0; 1237} 1238 1239/* this function was added to libpng 1.2.0 */ 1240void PNGAPI 1241png_set_mmx_thresholds (png_structp png_ptr, 1242 png_byte mmx_bitdepth_threshold, 1243 png_uint_32 mmx_rowbytes_threshold) 1244{ 1245/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */ 1246 if (png_ptr == NULL) 1247 return; 1248} 1249#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */ 1250 1251#ifdef PNG_SET_USER_LIMITS_SUPPORTED 1252/* this function was added to libpng 1.2.6 */ 1253void PNGAPI 1254png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max, 1255 png_uint_32 user_height_max) 1256{ 1257 /* Images with dimensions larger than these limits will be 1258 * rejected by png_set_IHDR(). To accept any PNG datastream 1259 * regardless of dimensions, set both limits to 0x7ffffffL. 1260 */ 1261 if(png_ptr == NULL) return; 1262 png_ptr->user_width_max = user_width_max; 1263 png_ptr->user_height_max = user_height_max; 1264} 1265#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */ 1266 1267#endif /* ?PNG_1_0_X */ 1268#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ 1269