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| 1 /* pngset.c - storage of image information into info struct | |
| 2 * | |
| 3 * Last changed in libpng 1.6.3 [July 18, 2013] | |
| 4 * Copyright (c) 1998-2013 Glenn Randers-Pehrson | |
| 5 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) | |
| 6 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) | |
| 7 * | |
| 8 * This code is released under the libpng license. | |
| 9 * For conditions of distribution and use, see the disclaimer | |
| 10 * and license in png.h | |
| 11 * | |
| 12 * The functions here are used during reads to store data from the file | |
| 13 * into the info struct, and during writes to store application data | |
| 14 * into the info struct for writing into the file. This abstracts the | |
| 15 * info struct and allows us to change the structure in the future. | |
| 16 */ | |
| 17 | |
| 18 #include "pngpriv.h" | |
| 19 | |
| 20 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) | |
| 21 | |
| 22 #ifdef PNG_bKGD_SUPPORTED | |
| 23 void PNGAPI | |
| 24 png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 25 png_const_color_16p background) | |
| 26 { | |
| 27 png_debug1(1, "in %s storage function", "bKGD"); | |
| 28 | |
| 29 if (png_ptr == NULL || info_ptr == NULL || background == NULL) | |
| 30 return; | |
| 31 | |
| 32 info_ptr->background = *background; | |
| 33 info_ptr->valid |= PNG_INFO_bKGD; | |
| 34 } | |
| 35 #endif | |
| 36 | |
| 37 #ifdef PNG_cHRM_SUPPORTED | |
| 38 void PNGFAPI | |
| 39 png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 40 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, | |
| 41 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, | |
| 42 png_fixed_point blue_x, png_fixed_point blue_y) | |
| 43 { | |
| 44 png_xy xy; | |
| 45 | |
| 46 png_debug1(1, "in %s storage function", "cHRM fixed"); | |
| 47 | |
| 48 if (png_ptr == NULL || info_ptr == NULL) | |
| 49 return; | |
| 50 | |
| 51 xy.redx = red_x; | |
| 52 xy.redy = red_y; | |
| 53 xy.greenx = green_x; | |
| 54 xy.greeny = green_y; | |
| 55 xy.bluex = blue_x; | |
| 56 xy.bluey = blue_y; | |
| 57 xy.whitex = white_x; | |
| 58 xy.whitey = white_y; | |
| 59 | |
| 60 if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy, | |
| 61 2/* override with app values*/)) | |
| 62 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; | |
| 63 | |
| 64 png_colorspace_sync_info(png_ptr, info_ptr); | |
| 65 } | |
| 66 | |
| 67 void PNGFAPI | |
| 68 png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 69 png_fixed_point int_red_X, png_fixed_point int_red_Y, | |
| 70 png_fixed_point int_red_Z, png_fixed_point int_green_X, | |
| 71 png_fixed_point int_green_Y, png_fixed_point int_green_Z, | |
| 72 png_fixed_point int_blue_X, png_fixed_point int_blue_Y, | |
| 73 png_fixed_point int_blue_Z) | |
| 74 { | |
| 75 png_XYZ XYZ; | |
| 76 | |
| 77 png_debug1(1, "in %s storage function", "cHRM XYZ fixed"); | |
| 78 | |
| 79 if (png_ptr == NULL || info_ptr == NULL) | |
| 80 return; | |
| 81 | |
| 82 XYZ.red_X = int_red_X; | |
| 83 XYZ.red_Y = int_red_Y; | |
| 84 XYZ.red_Z = int_red_Z; | |
| 85 XYZ.green_X = int_green_X; | |
| 86 XYZ.green_Y = int_green_Y; | |
| 87 XYZ.green_Z = int_green_Z; | |
| 88 XYZ.blue_X = int_blue_X; | |
| 89 XYZ.blue_Y = int_blue_Y; | |
| 90 XYZ.blue_Z = int_blue_Z; | |
| 91 | |
| 92 if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace, &XYZ, 2)) | |
| 93 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; | |
| 94 | |
| 95 png_colorspace_sync_info(png_ptr, info_ptr); | |
| 96 } | |
| 97 | |
| 98 # ifdef PNG_FLOATING_POINT_SUPPORTED | |
| 99 void PNGAPI | |
| 100 png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 101 double white_x, double white_y, double red_x, double red_y, | |
| 102 double green_x, double green_y, double blue_x, double blue_y) | |
| 103 { | |
| 104 png_set_cHRM_fixed(png_ptr, info_ptr, | |
| 105 png_fixed(png_ptr, white_x, "cHRM White X"), | |
| 106 png_fixed(png_ptr, white_y, "cHRM White Y"), | |
| 107 png_fixed(png_ptr, red_x, "cHRM Red X"), | |
| 108 png_fixed(png_ptr, red_y, "cHRM Red Y"), | |
| 109 png_fixed(png_ptr, green_x, "cHRM Green X"), | |
| 110 png_fixed(png_ptr, green_y, "cHRM Green Y"), | |
| 111 png_fixed(png_ptr, blue_x, "cHRM Blue X"), | |
| 112 png_fixed(png_ptr, blue_y, "cHRM Blue Y")); | |
| 113 } | |
| 114 | |
| 115 void PNGAPI | |
| 116 png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X, | |
| 117 double red_Y, double red_Z, double green_X, double green_Y, double green_Z, | |
| 118 double blue_X, double blue_Y, double blue_Z) | |
| 119 { | |
| 120 png_set_cHRM_XYZ_fixed(png_ptr, info_ptr, | |
| 121 png_fixed(png_ptr, red_X, "cHRM Red X"), | |
| 122 png_fixed(png_ptr, red_Y, "cHRM Red Y"), | |
| 123 png_fixed(png_ptr, red_Z, "cHRM Red Z"), | |
| 124 png_fixed(png_ptr, green_X, "cHRM Red X"), | |
| 125 png_fixed(png_ptr, green_Y, "cHRM Red Y"), | |
| 126 png_fixed(png_ptr, green_Z, "cHRM Red Z"), | |
| 127 png_fixed(png_ptr, blue_X, "cHRM Red X"), | |
| 128 png_fixed(png_ptr, blue_Y, "cHRM Red Y"), | |
| 129 png_fixed(png_ptr, blue_Z, "cHRM Red Z")); | |
| 130 } | |
| 131 # endif /* PNG_FLOATING_POINT_SUPPORTED */ | |
| 132 | |
| 133 #endif /* PNG_cHRM_SUPPORTED */ | |
| 134 | |
| 135 #ifdef PNG_gAMA_SUPPORTED | |
| 136 void PNGFAPI | |
| 137 png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 138 png_fixed_point file_gamma) | |
| 139 { | |
| 140 png_debug1(1, "in %s storage function", "gAMA"); | |
| 141 | |
| 142 if (png_ptr == NULL || info_ptr == NULL) | |
| 143 return; | |
| 144 | |
| 145 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma); | |
| 146 png_colorspace_sync_info(png_ptr, info_ptr); | |
| 147 } | |
| 148 | |
| 149 # ifdef PNG_FLOATING_POINT_SUPPORTED | |
| 150 void PNGAPI | |
| 151 png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma) | |
| 152 { | |
| 153 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma, | |
| 154 "png_set_gAMA")); | |
| 155 } | |
| 156 # endif | |
| 157 #endif | |
| 158 | |
| 159 #ifdef PNG_hIST_SUPPORTED | |
| 160 void PNGAPI | |
| 161 png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 162 png_const_uint_16p hist) | |
| 163 { | |
| 164 int i; | |
| 165 | |
| 166 png_debug1(1, "in %s storage function", "hIST"); | |
| 167 | |
| 168 if (png_ptr == NULL || info_ptr == NULL) | |
| 169 return; | |
| 170 | |
| 171 if (info_ptr->num_palette == 0 || info_ptr->num_palette | |
| 172 > PNG_MAX_PALETTE_LENGTH) | |
| 173 { | |
| 174 png_warning(png_ptr, | |
| 175 "Invalid palette size, hIST allocation skipped"); | |
| 176 | |
| 177 return; | |
| 178 } | |
| 179 | |
| 180 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0); | |
| 181 | |
| 182 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in | |
| 183 * version 1.2.1 | |
| 184 */ | |
| 185 info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr, | |
| 186 PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16)))); | |
| 187 | |
| 188 if (info_ptr->hist == NULL) | |
| 189 { | |
| 190 png_warning(png_ptr, "Insufficient memory for hIST chunk data"); | |
| 191 return; | |
| 192 } | |
| 193 | |
| 194 info_ptr->free_me |= PNG_FREE_HIST; | |
| 195 | |
| 196 for (i = 0; i < info_ptr->num_palette; i++) | |
| 197 info_ptr->hist[i] = hist[i]; | |
| 198 | |
| 199 info_ptr->valid |= PNG_INFO_hIST; | |
| 200 } | |
| 201 #endif | |
| 202 | |
| 203 void PNGAPI | |
| 204 png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 205 png_uint_32 width, png_uint_32 height, int bit_depth, | |
| 206 int color_type, int interlace_type, int compression_type, | |
| 207 int filter_type) | |
| 208 { | |
| 209 png_debug1(1, "in %s storage function", "IHDR"); | |
| 210 | |
| 211 if (png_ptr == NULL || info_ptr == NULL) | |
| 212 return; | |
| 213 | |
| 214 info_ptr->width = width; | |
| 215 info_ptr->height = height; | |
| 216 info_ptr->bit_depth = (png_byte)bit_depth; | |
| 217 info_ptr->color_type = (png_byte)color_type; | |
| 218 info_ptr->compression_type = (png_byte)compression_type; | |
| 219 info_ptr->filter_type = (png_byte)filter_type; | |
| 220 info_ptr->interlace_type = (png_byte)interlace_type; | |
| 221 | |
| 222 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height, | |
| 223 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type, | |
| 224 info_ptr->compression_type, info_ptr->filter_type); | |
| 225 | |
| 226 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) | |
| 227 info_ptr->channels = 1; | |
| 228 | |
| 229 else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR) | |
| 230 info_ptr->channels = 3; | |
| 231 | |
| 232 else | |
| 233 info_ptr->channels = 1; | |
| 234 | |
| 235 if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA) | |
| 236 info_ptr->channels++; | |
| 237 | |
| 238 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth); | |
| 239 | |
| 240 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width); | |
| 241 } | |
| 242 | |
| 243 #ifdef PNG_oFFs_SUPPORTED | |
| 244 void PNGAPI | |
| 245 png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 246 png_int_32 offset_x, png_int_32 offset_y, int unit_type) | |
| 247 { | |
| 248 png_debug1(1, "in %s storage function", "oFFs"); | |
| 249 | |
| 250 if (png_ptr == NULL || info_ptr == NULL) | |
| 251 return; | |
| 252 | |
| 253 info_ptr->x_offset = offset_x; | |
| 254 info_ptr->y_offset = offset_y; | |
| 255 info_ptr->offset_unit_type = (png_byte)unit_type; | |
| 256 info_ptr->valid |= PNG_INFO_oFFs; | |
| 257 } | |
| 258 #endif | |
| 259 | |
| 260 #ifdef PNG_pCAL_SUPPORTED | |
| 261 void PNGAPI | |
| 262 png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 263 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, | |
| 264 int nparams, png_const_charp units, png_charpp params) | |
| 265 { | |
| 266 png_size_t length; | |
| 267 int i; | |
| 268 | |
| 269 png_debug1(1, "in %s storage function", "pCAL"); | |
| 270 | |
| 271 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL | |
| 272 || (nparams > 0 && params == NULL)) | |
| 273 return; | |
| 274 | |
| 275 length = strlen(purpose) + 1; | |
| 276 png_debug1(3, "allocating purpose for info (%lu bytes)", | |
| 277 (unsigned long)length); | |
| 278 | |
| 279 /* TODO: validate format of calibration name and unit name */ | |
| 280 | |
| 281 /* Check that the type matches the specification. */ | |
| 282 if (type < 0 || type > 3) | |
| 283 png_error(png_ptr, "Invalid pCAL equation type"); | |
| 284 | |
| 285 if (nparams < 0 || nparams > 255) | |
| 286 png_error(png_ptr, "Invalid pCAL parameter count"); | |
| 287 | |
| 288 /* Validate params[nparams] */ | |
| 289 for (i=0; i<nparams; ++i) | |
| 290 if (params[i] == NULL || | |
| 291 !png_check_fp_string(params[i], strlen(params[i]))) | |
| 292 png_error(png_ptr, "Invalid format for pCAL parameter"); | |
| 293 | |
| 294 info_ptr->pcal_purpose = png_voidcast(png_charp, | |
| 295 png_malloc_warn(png_ptr, length)); | |
| 296 | |
| 297 if (info_ptr->pcal_purpose == NULL) | |
| 298 { | |
| 299 png_warning(png_ptr, "Insufficient memory for pCAL purpose"); | |
| 300 return; | |
| 301 } | |
| 302 | |
| 303 memcpy(info_ptr->pcal_purpose, purpose, length); | |
| 304 | |
| 305 png_debug(3, "storing X0, X1, type, and nparams in info"); | |
| 306 info_ptr->pcal_X0 = X0; | |
| 307 info_ptr->pcal_X1 = X1; | |
| 308 info_ptr->pcal_type = (png_byte)type; | |
| 309 info_ptr->pcal_nparams = (png_byte)nparams; | |
| 310 | |
| 311 length = strlen(units) + 1; | |
| 312 png_debug1(3, "allocating units for info (%lu bytes)", | |
| 313 (unsigned long)length); | |
| 314 | |
| 315 info_ptr->pcal_units = png_voidcast(png_charp, | |
| 316 png_malloc_warn(png_ptr, length)); | |
| 317 | |
| 318 if (info_ptr->pcal_units == NULL) | |
| 319 { | |
| 320 png_warning(png_ptr, "Insufficient memory for pCAL units"); | |
| 321 return; | |
| 322 } | |
| 323 | |
| 324 memcpy(info_ptr->pcal_units, units, length); | |
| 325 | |
| 326 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr, | |
| 327 (png_size_t)((nparams + 1) * (sizeof (png_charp))))); | |
| 328 | |
| 329 if (info_ptr->pcal_params == NULL) | |
| 330 { | |
| 331 png_warning(png_ptr, "Insufficient memory for pCAL params"); | |
| 332 return; | |
| 333 } | |
| 334 | |
| 335 memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp))); | |
| 336 | |
| 337 for (i = 0; i < nparams; i++) | |
| 338 { | |
| 339 length = strlen(params[i]) + 1; | |
| 340 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i, | |
| 341 (unsigned long)length); | |
| 342 | |
| 343 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length); | |
| 344 | |
| 345 if (info_ptr->pcal_params[i] == NULL) | |
| 346 { | |
| 347 png_warning(png_ptr, "Insufficient memory for pCAL parameter"); | |
| 348 return; | |
| 349 } | |
| 350 | |
| 351 memcpy(info_ptr->pcal_params[i], params[i], length); | |
| 352 } | |
| 353 | |
| 354 info_ptr->valid |= PNG_INFO_pCAL; | |
| 355 info_ptr->free_me |= PNG_FREE_PCAL; | |
| 356 } | |
| 357 #endif | |
| 358 | |
| 359 #ifdef PNG_sCAL_SUPPORTED | |
| 360 void PNGAPI | |
| 361 png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 362 int unit, png_const_charp swidth, png_const_charp sheight) | |
| 363 { | |
| 364 png_size_t lengthw = 0, lengthh = 0; | |
| 365 | |
| 366 png_debug1(1, "in %s storage function", "sCAL"); | |
| 367 | |
| 368 if (png_ptr == NULL || info_ptr == NULL) | |
| 369 return; | |
| 370 | |
| 371 /* Double check the unit (should never get here with an invalid | |
| 372 * unit unless this is an API call.) | |
| 373 */ | |
| 374 if (unit != 1 && unit != 2) | |
| 375 png_error(png_ptr, "Invalid sCAL unit"); | |
| 376 | |
| 377 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 || | |
| 378 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw)) | |
| 379 png_error(png_ptr, "Invalid sCAL width"); | |
| 380 | |
| 381 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 || | |
| 382 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh)) | |
| 383 png_error(png_ptr, "Invalid sCAL height"); | |
| 384 | |
| 385 info_ptr->scal_unit = (png_byte)unit; | |
| 386 | |
| 387 ++lengthw; | |
| 388 | |
| 389 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw); | |
| 390 | |
| 391 info_ptr->scal_s_width = png_voidcast(png_charp, | |
| 392 png_malloc_warn(png_ptr, lengthw)); | |
| 393 | |
| 394 if (info_ptr->scal_s_width == NULL) | |
| 395 { | |
| 396 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); | |
| 397 return; | |
| 398 } | |
| 399 | |
| 400 memcpy(info_ptr->scal_s_width, swidth, lengthw); | |
| 401 | |
| 402 ++lengthh; | |
| 403 | |
| 404 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh); | |
| 405 | |
| 406 info_ptr->scal_s_height = png_voidcast(png_charp, | |
| 407 png_malloc_warn(png_ptr, lengthh)); | |
| 408 | |
| 409 if (info_ptr->scal_s_height == NULL) | |
| 410 { | |
| 411 png_free (png_ptr, info_ptr->scal_s_width); | |
| 412 info_ptr->scal_s_width = NULL; | |
| 413 | |
| 414 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); | |
| 415 return; | |
| 416 } | |
| 417 | |
| 418 memcpy(info_ptr->scal_s_height, sheight, lengthh); | |
| 419 | |
| 420 info_ptr->valid |= PNG_INFO_sCAL; | |
| 421 info_ptr->free_me |= PNG_FREE_SCAL; | |
| 422 } | |
| 423 | |
| 424 # ifdef PNG_FLOATING_POINT_SUPPORTED | |
| 425 void PNGAPI | |
| 426 png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit, | |
| 427 double width, double height) | |
| 428 { | |
| 429 png_debug1(1, "in %s storage function", "sCAL"); | |
| 430 | |
| 431 /* Check the arguments. */ | |
| 432 if (width <= 0) | |
| 433 png_warning(png_ptr, "Invalid sCAL width ignored"); | |
| 434 | |
| 435 else if (height <= 0) | |
| 436 png_warning(png_ptr, "Invalid sCAL height ignored"); | |
| 437 | |
| 438 else | |
| 439 { | |
| 440 /* Convert 'width' and 'height' to ASCII. */ | |
| 441 char swidth[PNG_sCAL_MAX_DIGITS+1]; | |
| 442 char sheight[PNG_sCAL_MAX_DIGITS+1]; | |
| 443 | |
| 444 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width, | |
| 445 PNG_sCAL_PRECISION); | |
| 446 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height, | |
| 447 PNG_sCAL_PRECISION); | |
| 448 | |
| 449 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); | |
| 450 } | |
| 451 } | |
| 452 # endif | |
| 453 | |
| 454 # ifdef PNG_FIXED_POINT_SUPPORTED | |
| 455 void PNGAPI | |
| 456 png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit, | |
| 457 png_fixed_point width, png_fixed_point height) | |
| 458 { | |
| 459 png_debug1(1, "in %s storage function", "sCAL"); | |
| 460 | |
| 461 /* Check the arguments. */ | |
| 462 if (width <= 0) | |
| 463 png_warning(png_ptr, "Invalid sCAL width ignored"); | |
| 464 | |
| 465 else if (height <= 0) | |
| 466 png_warning(png_ptr, "Invalid sCAL height ignored"); | |
| 467 | |
| 468 else | |
| 469 { | |
| 470 /* Convert 'width' and 'height' to ASCII. */ | |
| 471 char swidth[PNG_sCAL_MAX_DIGITS+1]; | |
| 472 char sheight[PNG_sCAL_MAX_DIGITS+1]; | |
| 473 | |
| 474 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width); | |
| 475 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height); | |
| 476 | |
| 477 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); | |
| 478 } | |
| 479 } | |
| 480 # endif | |
| 481 #endif | |
| 482 | |
| 483 #ifdef PNG_pHYs_SUPPORTED | |
| 484 void PNGAPI | |
| 485 png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 486 png_uint_32 res_x, png_uint_32 res_y, int unit_type) | |
| 487 { | |
| 488 png_debug1(1, "in %s storage function", "pHYs"); | |
| 489 | |
| 490 if (png_ptr == NULL || info_ptr == NULL) | |
| 491 return; | |
| 492 | |
| 493 info_ptr->x_pixels_per_unit = res_x; | |
| 494 info_ptr->y_pixels_per_unit = res_y; | |
| 495 info_ptr->phys_unit_type = (png_byte)unit_type; | |
| 496 info_ptr->valid |= PNG_INFO_pHYs; | |
| 497 } | |
| 498 #endif | |
| 499 | |
| 500 void PNGAPI | |
| 501 png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr, | |
| 502 png_const_colorp palette, int num_palette) | |
| 503 { | |
| 504 | |
| 505 png_debug1(1, "in %s storage function", "PLTE"); | |
| 506 | |
| 507 if (png_ptr == NULL || info_ptr == NULL) | |
| 508 return; | |
| 509 | |
| 510 if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH) | |
| 511 { | |
| 512 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) | |
| 513 png_error(png_ptr, "Invalid palette length"); | |
| 514 | |
| 515 else | |
| 516 { | |
| 517 png_warning(png_ptr, "Invalid palette length"); | |
| 518 return; | |
| 519 } | |
| 520 } | |
| 521 | |
| 522 if ((num_palette > 0 && palette == NULL) || | |
| 523 (num_palette == 0 | |
| 524 # ifdef PNG_MNG_FEATURES_SUPPORTED | |
| 525 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 | |
| 526 # endif | |
| 527 )) | |
| 528 { | |
| 529 png_chunk_report(png_ptr, "Invalid palette", PNG_CHUNK_ERROR); | |
| 530 return; | |
| 531 } | |
| 532 | |
| 533 /* It may not actually be necessary to set png_ptr->palette here; | |
| 534 * we do it for backward compatibility with the way the png_handle_tRNS | |
| 535 * function used to do the allocation. | |
| 536 * | |
| 537 * 1.6.0: the above statement appears to be incorrect; something has to set | |
| 538 * the palette inside png_struct on read. | |
| 539 */ | |
| 540 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); | |
| 541 | |
| 542 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead | |
| 543 * of num_palette entries, in case of an invalid PNG file that has | |
| 544 * too-large sample values. | |
| 545 */ | |
| 546 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr, | |
| 547 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)))); | |
| 548 | |
| 549 if (num_palette > 0) | |
| 550 memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color))); | |
| 551 info_ptr->palette = png_ptr->palette; | |
| 552 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; | |
| 553 | |
| 554 info_ptr->free_me |= PNG_FREE_PLTE; | |
| 555 | |
| 556 info_ptr->valid |= PNG_INFO_PLTE; | |
| 557 } | |
| 558 | |
| 559 #ifdef PNG_sBIT_SUPPORTED | |
| 560 void PNGAPI | |
| 561 png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 562 png_const_color_8p sig_bit) | |
| 563 { | |
| 564 png_debug1(1, "in %s storage function", "sBIT"); | |
| 565 | |
| 566 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL) | |
| 567 return; | |
| 568 | |
| 569 info_ptr->sig_bit = *sig_bit; | |
| 570 info_ptr->valid |= PNG_INFO_sBIT; | |
| 571 } | |
| 572 #endif | |
| 573 | |
| 574 #ifdef PNG_sRGB_SUPPORTED | |
| 575 void PNGAPI | |
| 576 png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent) | |
| 577 { | |
| 578 png_debug1(1, "in %s storage function", "sRGB"); | |
| 579 | |
| 580 if (png_ptr == NULL || info_ptr == NULL) | |
| 581 return; | |
| 582 | |
| 583 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent); | |
| 584 png_colorspace_sync_info(png_ptr, info_ptr); | |
| 585 } | |
| 586 | |
| 587 void PNGAPI | |
| 588 png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 589 int srgb_intent) | |
| 590 { | |
| 591 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM"); | |
| 592 | |
| 593 if (png_ptr == NULL || info_ptr == NULL) | |
| 594 return; | |
| 595 | |
| 596 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent)) | |
| 597 { | |
| 598 /* This causes the gAMA and cHRM to be written too */ | |
| 599 info_ptr->colorspace.flags |= | |
| 600 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; | |
| 601 } | |
| 602 | |
| 603 png_colorspace_sync_info(png_ptr, info_ptr); | |
| 604 } | |
| 605 #endif /* sRGB */ | |
| 606 | |
| 607 | |
| 608 #ifdef PNG_iCCP_SUPPORTED | |
| 609 void PNGAPI | |
| 610 png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 611 png_const_charp name, int compression_type, | |
| 612 png_const_bytep profile, png_uint_32 proflen) | |
| 613 { | |
| 614 png_charp new_iccp_name; | |
| 615 png_bytep new_iccp_profile; | |
| 616 png_size_t length; | |
| 617 | |
| 618 png_debug1(1, "in %s storage function", "iCCP"); | |
| 619 | |
| 620 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL) | |
| 621 return; | |
| 622 | |
| 623 if (compression_type != PNG_COMPRESSION_TYPE_BASE) | |
| 624 png_app_error(png_ptr, "Invalid iCCP compression method"); | |
| 625 | |
| 626 /* Set the colorspace first because this validates the profile; do not | |
| 627 * override previously set app cHRM or gAMA here (because likely as not the | |
| 628 * application knows better than libpng what the correct values are.) Pass | |
| 629 * the info_ptr color_type field to png_colorspace_set_ICC because in the | |
| 630 * write case it has not yet been stored in png_ptr. | |
| 631 */ | |
| 632 { | |
| 633 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name, | |
| 634 proflen, profile, info_ptr->color_type); | |
| 635 | |
| 636 png_colorspace_sync_info(png_ptr, info_ptr); | |
| 637 | |
| 638 /* Don't do any of the copying if the profile was bad, or inconsistent. */ | |
| 639 if (!result) | |
| 640 return; | |
| 641 | |
| 642 /* But do write the gAMA and cHRM chunks from the profile. */ | |
| 643 info_ptr->colorspace.flags |= | |
| 644 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; | |
| 645 } | |
| 646 | |
| 647 length = strlen(name)+1; | |
| 648 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length)); | |
| 649 | |
| 650 if (new_iccp_name == NULL) | |
| 651 { | |
| 652 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk"); | |
| 653 return; | |
| 654 } | |
| 655 | |
| 656 memcpy(new_iccp_name, name, length); | |
| 657 new_iccp_profile = png_voidcast(png_bytep, | |
| 658 png_malloc_warn(png_ptr, proflen)); | |
| 659 | |
| 660 if (new_iccp_profile == NULL) | |
| 661 { | |
| 662 png_free(png_ptr, new_iccp_name); | |
| 663 png_benign_error(png_ptr, | |
| 664 "Insufficient memory to process iCCP profile"); | |
| 665 return; | |
| 666 } | |
| 667 | |
| 668 memcpy(new_iccp_profile, profile, proflen); | |
| 669 | |
| 670 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0); | |
| 671 | |
| 672 info_ptr->iccp_proflen = proflen; | |
| 673 info_ptr->iccp_name = new_iccp_name; | |
| 674 info_ptr->iccp_profile = new_iccp_profile; | |
| 675 info_ptr->free_me |= PNG_FREE_ICCP; | |
| 676 info_ptr->valid |= PNG_INFO_iCCP; | |
| 677 } | |
| 678 #endif | |
| 679 | |
| 680 #ifdef PNG_TEXT_SUPPORTED | |
| 681 void PNGAPI | |
| 682 png_set_text(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 683 png_const_textp text_ptr, int num_text) | |
| 684 { | |
| 685 int ret; | |
| 686 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text); | |
| 687 | |
| 688 if (ret) | |
| 689 png_error(png_ptr, "Insufficient memory to store text"); | |
| 690 } | |
| 691 | |
| 692 int /* PRIVATE */ | |
| 693 png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 694 png_const_textp text_ptr, int num_text) | |
| 695 { | |
| 696 int i; | |
| 697 | |
| 698 png_debug1(1, "in %lx storage function", png_ptr == NULL ? "unexpected" : | |
| 699 (unsigned long)png_ptr->chunk_name); | |
| 700 | |
| 701 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL) | |
| 702 return(0); | |
| 703 | |
| 704 /* Make sure we have enough space in the "text" array in info_struct | |
| 705 * to hold all of the incoming text_ptr objects. This compare can't overflow | |
| 706 * because max_text >= num_text (anyway, subtract of two positive integers | |
| 707 * can't overflow in any case.) | |
| 708 */ | |
| 709 if (num_text > info_ptr->max_text - info_ptr->num_text) | |
| 710 { | |
| 711 int old_num_text = info_ptr->num_text; | |
| 712 int max_text; | |
| 713 png_textp new_text = NULL; | |
| 714 | |
| 715 /* Calculate an appropriate max_text, checking for overflow. */ | |
| 716 max_text = old_num_text; | |
| 717 if (num_text <= INT_MAX - max_text) | |
| 718 { | |
| 719 max_text += num_text; | |
| 720 | |
| 721 /* Round up to a multiple of 8 */ | |
| 722 if (max_text < INT_MAX-8) | |
| 723 max_text = (max_text + 8) & ~0x7; | |
| 724 | |
| 725 else | |
| 726 max_text = INT_MAX; | |
| 727 | |
| 728 /* Now allocate a new array and copy the old members in, this does all | |
| 729 * the overflow checks. | |
| 730 */ | |
| 731 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr, | |
| 732 info_ptr->text, old_num_text, max_text-old_num_text, | |
| 733 sizeof *new_text)); | |
| 734 } | |
| 735 | |
| 736 if (new_text == NULL) | |
| 737 { | |
| 738 png_chunk_report(png_ptr, "too many text chunks", | |
| 739 PNG_CHUNK_WRITE_ERROR); | |
| 740 return 1; | |
| 741 } | |
| 742 | |
| 743 png_free(png_ptr, info_ptr->text); | |
| 744 | |
| 745 info_ptr->text = new_text; | |
| 746 info_ptr->free_me |= PNG_FREE_TEXT; | |
| 747 info_ptr->max_text = max_text; | |
| 748 /* num_text is adjusted below as the entries are copied in */ | |
| 749 | |
| 750 png_debug1(3, "allocated %d entries for info_ptr->text", max_text); | |
| 751 } | |
| 752 | |
| 753 for (i = 0; i < num_text; i++) | |
| 754 { | |
| 755 size_t text_length, key_len; | |
| 756 size_t lang_len, lang_key_len; | |
| 757 png_textp textp = &(info_ptr->text[info_ptr->num_text]); | |
| 758 | |
| 759 if (text_ptr[i].key == NULL) | |
| 760 continue; | |
| 761 | |
| 762 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE || | |
| 763 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST) | |
| 764 { | |
| 765 png_chunk_report(png_ptr, "text compression mode is out of range", | |
| 766 PNG_CHUNK_WRITE_ERROR); | |
| 767 continue; | |
| 768 } | |
| 769 | |
| 770 key_len = strlen(text_ptr[i].key); | |
| 771 | |
| 772 if (text_ptr[i].compression <= 0) | |
| 773 { | |
| 774 lang_len = 0; | |
| 775 lang_key_len = 0; | |
| 776 } | |
| 777 | |
| 778 else | |
| 779 # ifdef PNG_iTXt_SUPPORTED | |
| 780 { | |
| 781 /* Set iTXt data */ | |
| 782 | |
| 783 if (text_ptr[i].lang != NULL) | |
| 784 lang_len = strlen(text_ptr[i].lang); | |
| 785 | |
| 786 else | |
| 787 lang_len = 0; | |
| 788 | |
| 789 if (text_ptr[i].lang_key != NULL) | |
| 790 lang_key_len = strlen(text_ptr[i].lang_key); | |
| 791 | |
| 792 else | |
| 793 lang_key_len = 0; | |
| 794 } | |
| 795 # else /* PNG_iTXt_SUPPORTED */ | |
| 796 { | |
| 797 png_chunk_report(png_ptr, "iTXt chunk not supported", | |
| 798 PNG_CHUNK_WRITE_ERROR); | |
| 799 continue; | |
| 800 } | |
| 801 # endif | |
| 802 | |
| 803 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0') | |
| 804 { | |
| 805 text_length = 0; | |
| 806 # ifdef PNG_iTXt_SUPPORTED | |
| 807 if (text_ptr[i].compression > 0) | |
| 808 textp->compression = PNG_ITXT_COMPRESSION_NONE; | |
| 809 | |
| 810 else | |
| 811 # endif | |
| 812 textp->compression = PNG_TEXT_COMPRESSION_NONE; | |
| 813 } | |
| 814 | |
| 815 else | |
| 816 { | |
| 817 text_length = strlen(text_ptr[i].text); | |
| 818 textp->compression = text_ptr[i].compression; | |
| 819 } | |
| 820 | |
| 821 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr, | |
| 822 key_len + text_length + lang_len + lang_key_len + 4)); | |
| 823 | |
| 824 if (textp->key == NULL) | |
| 825 { | |
| 826 png_chunk_report(png_ptr, "text chunk: out of memory", | |
| 827 PNG_CHUNK_WRITE_ERROR); | |
| 828 return 1; | |
| 829 } | |
| 830 | |
| 831 png_debug2(2, "Allocated %lu bytes at %p in png_set_text", | |
| 832 (unsigned long)(png_uint_32) | |
| 833 (key_len + lang_len + lang_key_len + text_length + 4), | |
| 834 textp->key); | |
| 835 | |
| 836 memcpy(textp->key, text_ptr[i].key, key_len); | |
| 837 *(textp->key + key_len) = '\0'; | |
| 838 | |
| 839 if (text_ptr[i].compression > 0) | |
| 840 { | |
| 841 textp->lang = textp->key + key_len + 1; | |
| 842 memcpy(textp->lang, text_ptr[i].lang, lang_len); | |
| 843 *(textp->lang + lang_len) = '\0'; | |
| 844 textp->lang_key = textp->lang + lang_len + 1; | |
| 845 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); | |
| 846 *(textp->lang_key + lang_key_len) = '\0'; | |
| 847 textp->text = textp->lang_key + lang_key_len + 1; | |
| 848 } | |
| 849 | |
| 850 else | |
| 851 { | |
| 852 textp->lang=NULL; | |
| 853 textp->lang_key=NULL; | |
| 854 textp->text = textp->key + key_len + 1; | |
| 855 } | |
| 856 | |
| 857 if (text_length) | |
| 858 memcpy(textp->text, text_ptr[i].text, text_length); | |
| 859 | |
| 860 *(textp->text + text_length) = '\0'; | |
| 861 | |
| 862 # ifdef PNG_iTXt_SUPPORTED | |
| 863 if (textp->compression > 0) | |
| 864 { | |
| 865 textp->text_length = 0; | |
| 866 textp->itxt_length = text_length; | |
| 867 } | |
| 868 | |
| 869 else | |
| 870 # endif | |
| 871 { | |
| 872 textp->text_length = text_length; | |
| 873 textp->itxt_length = 0; | |
| 874 } | |
| 875 | |
| 876 info_ptr->num_text++; | |
| 877 png_debug1(3, "transferred text chunk %d", info_ptr->num_text); | |
| 878 } | |
| 879 | |
| 880 return(0); | |
| 881 } | |
| 882 #endif | |
| 883 | |
| 884 #ifdef PNG_tIME_SUPPORTED | |
| 885 void PNGAPI | |
| 886 png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 887 png_const_timep mod_time) | |
| 888 { | |
| 889 png_debug1(1, "in %s storage function", "tIME"); | |
| 890 | |
| 891 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL || | |
| 892 (png_ptr->mode & PNG_WROTE_tIME)) | |
| 893 return; | |
| 894 | |
| 895 if (mod_time->month == 0 || mod_time->month > 12 || | |
| 896 mod_time->day == 0 || mod_time->day > 31 || | |
| 897 mod_time->hour > 23 || mod_time->minute > 59 || | |
| 898 mod_time->second > 60) | |
| 899 { | |
| 900 png_warning(png_ptr, "Ignoring invalid time value"); | |
| 901 return; | |
| 902 } | |
| 903 | |
| 904 info_ptr->mod_time = *mod_time; | |
| 905 info_ptr->valid |= PNG_INFO_tIME; | |
| 906 } | |
| 907 #endif | |
| 908 | |
| 909 #ifdef PNG_tRNS_SUPPORTED | |
| 910 void PNGAPI | |
| 911 png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr, | |
| 912 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color) | |
| 913 { | |
| 914 png_debug1(1, "in %s storage function", "tRNS"); | |
| 915 | |
| 916 if (png_ptr == NULL || info_ptr == NULL) | |
| 917 return; | |
| 918 | |
| 919 if (trans_alpha != NULL) | |
| 920 { | |
| 921 /* It may not actually be necessary to set png_ptr->trans_alpha here; | |
| 922 * we do it for backward compatibility with the way the png_handle_tRNS | |
| 923 * function used to do the allocation. | |
| 924 * | |
| 925 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively | |
| 926 * relies on png_set_tRNS storing the information in png_struct | |
| 927 * (otherwise it won't be there for the code in pngrtran.c). | |
| 928 */ | |
| 929 | |
| 930 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0); | |
| 931 | |
| 932 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */ | |
| 933 png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep, | |
| 934 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH)); | |
| 935 | |
| 936 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH) | |
| 937 memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans); | |
| 938 } | |
| 939 | |
| 940 if (trans_color != NULL) | |
| 941 { | |
| 942 int sample_max = (1 << info_ptr->bit_depth); | |
| 943 | |
| 944 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY && | |
| 945 trans_color->gray > sample_max) || | |
| 946 (info_ptr->color_type == PNG_COLOR_TYPE_RGB && | |
| 947 (trans_color->red > sample_max || | |
| 948 trans_color->green > sample_max || | |
| 949 trans_color->blue > sample_max))) | |
| 950 png_warning(png_ptr, | |
| 951 "tRNS chunk has out-of-range samples for bit_depth"); | |
| 952 | |
| 953 info_ptr->trans_color = *trans_color; | |
| 954 | |
| 955 if (num_trans == 0) | |
| 956 num_trans = 1; | |
| 957 } | |
| 958 | |
| 959 info_ptr->num_trans = (png_uint_16)num_trans; | |
| 960 | |
| 961 if (num_trans != 0) | |
| 962 { | |
| 963 info_ptr->valid |= PNG_INFO_tRNS; | |
| 964 info_ptr->free_me |= PNG_FREE_TRNS; | |
| 965 } | |
| 966 } | |
| 967 #endif | |
| 968 | |
| 969 #ifdef PNG_sPLT_SUPPORTED | |
| 970 void PNGAPI | |
| 971 png_set_sPLT(png_const_structrp png_ptr, | |
| 972 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries) | |
| 973 /* | |
| 974 * entries - array of png_sPLT_t structures | |
| 975 * to be added to the list of palettes | |
| 976 * in the info structure. | |
| 977 * | |
| 978 * nentries - number of palette structures to be | |
| 979 * added. | |
| 980 */ | |
| 981 { | |
| 982 png_sPLT_tp np; | |
| 983 | |
| 984 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL) | |
| 985 return; | |
| 986 | |
| 987 /* Use the internal realloc function, which checks for all the possible | |
| 988 * overflows. Notice that the parameters are (int) and (size_t) | |
| 989 */ | |
| 990 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr, | |
| 991 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries, | |
| 992 sizeof *np)); | |
| 993 | |
| 994 if (np == NULL) | |
| 995 { | |
| 996 /* Out of memory or too many chunks */ | |
| 997 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR); | |
| 998 return; | |
| 999 } | |
| 1000 | |
| 1001 png_free(png_ptr, info_ptr->splt_palettes); | |
| 1002 info_ptr->splt_palettes = np; | |
| 1003 info_ptr->free_me |= PNG_FREE_SPLT; | |
| 1004 | |
| 1005 np += info_ptr->splt_palettes_num; | |
| 1006 | |
| 1007 do | |
| 1008 { | |
| 1009 png_size_t length; | |
| 1010 | |
| 1011 /* Skip invalid input entries */ | |
| 1012 if (entries->name == NULL || entries->entries == NULL) | |
| 1013 { | |
| 1014 /* png_handle_sPLT doesn't do this, so this is an app error */ | |
| 1015 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT"); | |
| 1016 /* Just skip the invalid entry */ | |
| 1017 continue; | |
| 1018 } | |
| 1019 | |
| 1020 np->depth = entries->depth; | |
| 1021 | |
| 1022 /* In the even of out-of-memory just return - there's no point keeping on | |
| 1023 * trying to add sPLT chunks. | |
| 1024 */ | |
| 1025 length = strlen(entries->name) + 1; | |
| 1026 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length)); | |
| 1027 | |
| 1028 if (np->name == NULL) | |
| 1029 break; | |
| 1030 | |
| 1031 memcpy(np->name, entries->name, length); | |
| 1032 | |
| 1033 /* IMPORTANT: we have memory now that won't get freed if something else | |
| 1034 * goes wrong, this code must free it. png_malloc_array produces no | |
| 1035 * warnings, use a png_chunk_report (below) if there is an error. | |
| 1036 */ | |
| 1037 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr, | |
| 1038 entries->nentries, sizeof (png_sPLT_entry))); | |
| 1039 | |
| 1040 if (np->entries == NULL) | |
| 1041 { | |
| 1042 png_free(png_ptr, np->name); | |
| 1043 break; | |
| 1044 } | |
| 1045 | |
| 1046 np->nentries = entries->nentries; | |
| 1047 /* This multiply can't overflow because png_malloc_array has already | |
| 1048 * checked it when doing the allocation. | |
| 1049 */ | |
| 1050 memcpy(np->entries, entries->entries, | |
| 1051 entries->nentries * sizeof (png_sPLT_entry)); | |
| 1052 | |
| 1053 /* Note that 'continue' skips the advance of the out pointer and out | |
| 1054 * count, so an invalid entry is not added. | |
| 1055 */ | |
| 1056 info_ptr->valid |= PNG_INFO_sPLT; | |
| 1057 ++(info_ptr->splt_palettes_num); | |
| 1058 ++np; | |
| 1059 } | |
| 1060 while (++entries, --nentries); | |
| 1061 | |
| 1062 if (nentries > 0) | |
| 1063 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR); | |
| 1064 } | |
| 1065 #endif /* PNG_sPLT_SUPPORTED */ | |
| 1066 | |
| 1067 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED | |
| 1068 static png_byte | |
| 1069 check_location(png_const_structrp png_ptr, int location) | |
| 1070 { | |
| 1071 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT); | |
| 1072 | |
| 1073 /* New in 1.6.0; copy the location and check it. This is an API | |
| 1074 * change, previously the app had to use the | |
| 1075 * png_set_unknown_chunk_location API below for each chunk. | |
| 1076 */ | |
| 1077 if (location == 0 && !(png_ptr->mode & PNG_IS_READ_STRUCT)) | |
| 1078 { | |
| 1079 /* Write struct, so unknown chunks come from the app */ | |
| 1080 png_app_warning(png_ptr, | |
| 1081 "png_set_unknown_chunks now expects a valid location"); | |
| 1082 /* Use the old behavior */ | |
| 1083 location = (png_byte)(png_ptr->mode & | |
| 1084 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)); | |
| 1085 } | |
| 1086 | |
| 1087 /* This need not be an internal error - if the app calls | |
| 1088 * png_set_unknown_chunks on a read pointer it must get the location right. | |
| 1089 */ | |
| 1090 if (location == 0) | |
| 1091 png_error(png_ptr, "invalid location in png_set_unknown_chunks"); | |
| 1092 | |
| 1093 /* Now reduce the location to the top-most set bit by removing each least | |
| 1094 * significant bit in turn. | |
| 1095 */ | |
| 1096 while (location != (location & -location)) | |
| 1097 location &= ~(location & -location); | |
| 1098 | |
| 1099 /* The cast is safe because 'location' is a bit mask and only the low four | |
| 1100 * bits are significant. | |
| 1101 */ | |
| 1102 return (png_byte)location; | |
| 1103 } | |
| 1104 | |
| 1105 void PNGAPI | |
| 1106 png_set_unknown_chunks(png_const_structrp png_ptr, | |
| 1107 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns) | |
| 1108 { | |
| 1109 png_unknown_chunkp np; | |
| 1110 | |
| 1111 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 || | |
| 1112 unknowns == NULL) | |
| 1113 return; | |
| 1114 | |
| 1115 /* Check for the failure cases where support has been disabled at compile | |
| 1116 * time. This code is hardly ever compiled - it's here because | |
| 1117 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this | |
| 1118 * code) but may be meaningless if the read or write handling of unknown | |
| 1119 * chunks is not compiled in. | |
| 1120 */ | |
| 1121 # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \ | |
| 1122 defined(PNG_READ_SUPPORTED) | |
| 1123 if (png_ptr->mode & PNG_IS_READ_STRUCT) | |
| 1124 { | |
| 1125 png_app_error(png_ptr, "no unknown chunk support on read"); | |
| 1126 return; | |
| 1127 } | |
| 1128 # endif | |
| 1129 # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \ | |
| 1130 defined(PNG_WRITE_SUPPORTED) | |
| 1131 if (!(png_ptr->mode & PNG_IS_READ_STRUCT)) | |
| 1132 { | |
| 1133 png_app_error(png_ptr, "no unknown chunk support on write"); | |
| 1134 return; | |
| 1135 } | |
| 1136 # endif | |
| 1137 | |
| 1138 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that | |
| 1139 * unknown critical chunks could be lost with just a warning resulting in | |
| 1140 * undefined behavior. Now png_chunk_report is used to provide behavior | |
| 1141 * appropriate to read or write. | |
| 1142 */ | |
| 1143 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr, | |
| 1144 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns, | |
| 1145 sizeof *np)); | |
| 1146 | |
| 1147 if (np == NULL) | |
| 1148 { | |
| 1149 png_chunk_report(png_ptr, "too many unknown chunks", | |
| 1150 PNG_CHUNK_WRITE_ERROR); | |
| 1151 return; | |
| 1152 } | |
| 1153 | |
| 1154 png_free(png_ptr, info_ptr->unknown_chunks); | |
| 1155 info_ptr->unknown_chunks = np; /* safe because it is initialized */ | |
| 1156 info_ptr->free_me |= PNG_FREE_UNKN; | |
| 1157 | |
| 1158 np += info_ptr->unknown_chunks_num; | |
| 1159 | |
| 1160 /* Increment unknown_chunks_num each time round the loop to protect the | |
| 1161 * just-allocated chunk data. | |
| 1162 */ | |
| 1163 for (; num_unknowns > 0; --num_unknowns, ++unknowns) | |
| 1164 { | |
| 1165 memcpy(np->name, unknowns->name, (sizeof np->name)); | |
| 1166 np->name[(sizeof np->name)-1] = '\0'; | |
| 1167 np->location = check_location(png_ptr, unknowns->location); | |
| 1168 | |
| 1169 if (unknowns->size == 0) | |
| 1170 { | |
| 1171 np->data = NULL; | |
| 1172 np->size = 0; | |
| 1173 } | |
| 1174 | |
| 1175 else | |
| 1176 { | |
| 1177 np->data = png_voidcast(png_bytep, | |
| 1178 png_malloc_base(png_ptr, unknowns->size)); | |
| 1179 | |
| 1180 if (np->data == NULL) | |
| 1181 { | |
| 1182 png_chunk_report(png_ptr, "unknown chunk: out of memory", | |
| 1183 PNG_CHUNK_WRITE_ERROR); | |
| 1184 /* But just skip storing the unknown chunk */ | |
| 1185 continue; | |
| 1186 } | |
| 1187 | |
| 1188 memcpy(np->data, unknowns->data, unknowns->size); | |
| 1189 np->size = unknowns->size; | |
| 1190 } | |
| 1191 | |
| 1192 /* These increments are skipped on out-of-memory for the data - the | |
| 1193 * unknown chunk entry gets overwritten if the png_chunk_report returns. | |
| 1194 * This is correct in the read case (the chunk is just dropped.) | |
| 1195 */ | |
| 1196 ++np; | |
| 1197 ++(info_ptr->unknown_chunks_num); | |
| 1198 } | |
| 1199 } | |
| 1200 | |
| 1201 void PNGAPI | |
| 1202 png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 1203 int chunk, int location) | |
| 1204 { | |
| 1205 /* This API is pretty pointless in 1.6.0 because the location can be set | |
| 1206 * before the call to png_set_unknown_chunks. | |
| 1207 * | |
| 1208 * TODO: add a png_app_warning in 1.7 | |
| 1209 */ | |
| 1210 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && | |
| 1211 chunk < info_ptr->unknown_chunks_num) | |
| 1212 { | |
| 1213 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0) | |
| 1214 { | |
| 1215 png_app_error(png_ptr, "invalid unknown chunk location"); | |
| 1216 /* Fake out the pre 1.6.0 behavior: */ | |
| 1217 if ((location & PNG_HAVE_IDAT)) /* undocumented! */ | |
| 1218 location = PNG_AFTER_IDAT; | |
| 1219 | |
| 1220 else | |
| 1221 location = PNG_HAVE_IHDR; /* also undocumented */ | |
| 1222 } | |
| 1223 | |
| 1224 info_ptr->unknown_chunks[chunk].location = | |
| 1225 check_location(png_ptr, location); | |
| 1226 } | |
| 1227 } | |
| 1228 #endif | |
| 1229 | |
| 1230 | |
| 1231 #ifdef PNG_MNG_FEATURES_SUPPORTED | |
| 1232 png_uint_32 PNGAPI | |
| 1233 png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features) | |
| 1234 { | |
| 1235 png_debug(1, "in png_permit_mng_features"); | |
| 1236 | |
| 1237 if (png_ptr == NULL) | |
| 1238 return 0; | |
| 1239 | |
| 1240 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES; | |
| 1241 | |
| 1242 return png_ptr->mng_features_permitted; | |
| 1243 } | |
| 1244 #endif | |
| 1245 | |
| 1246 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED | |
| 1247 static unsigned int | |
| 1248 add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep) | |
| 1249 { | |
| 1250 unsigned int i; | |
| 1251 | |
| 1252 /* Utility function: update the 'keep' state of a chunk if it is already in | |
| 1253 * the list, otherwise add it to the list. | |
| 1254 */ | |
| 1255 for (i=0; i<count; ++i, list += 5) if (memcmp(list, add, 4) == 0) | |
| 1256 { | |
| 1257 list[4] = (png_byte)keep; | |
| 1258 return count; | |
| 1259 } | |
| 1260 | |
| 1261 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT) | |
| 1262 { | |
| 1263 ++count; | |
| 1264 memcpy(list, add, 4); | |
| 1265 list[4] = (png_byte)keep; | |
| 1266 } | |
| 1267 | |
| 1268 return count; | |
| 1269 } | |
| 1270 | |
| 1271 void PNGAPI | |
| 1272 png_set_keep_unknown_chunks(png_structrp png_ptr, int keep, | |
| 1273 png_const_bytep chunk_list, int num_chunks_in) | |
| 1274 { | |
| 1275 png_bytep new_list; | |
| 1276 unsigned int num_chunks, old_num_chunks; | |
| 1277 | |
| 1278 if (png_ptr == NULL) | |
| 1279 return; | |
| 1280 | |
| 1281 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST) | |
| 1282 { | |
| 1283 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep"); | |
| 1284 return; | |
| 1285 } | |
| 1286 | |
| 1287 if (num_chunks_in <= 0) | |
| 1288 { | |
| 1289 png_ptr->unknown_default = keep; | |
| 1290 | |
| 1291 /* '0' means just set the flags, so stop here */ | |
| 1292 if (num_chunks_in == 0) | |
| 1293 return; | |
| 1294 } | |
| 1295 | |
| 1296 if (num_chunks_in < 0) | |
| 1297 { | |
| 1298 /* Ignore all unknown chunks and all chunks recognized by | |
| 1299 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND | |
| 1300 */ | |
| 1301 static PNG_CONST png_byte chunks_to_ignore[] = { | |
| 1302 98, 75, 71, 68, '\0', /* bKGD */ | |
| 1303 99, 72, 82, 77, '\0', /* cHRM */ | |
| 1304 103, 65, 77, 65, '\0', /* gAMA */ | |
| 1305 104, 73, 83, 84, '\0', /* hIST */ | |
| 1306 105, 67, 67, 80, '\0', /* iCCP */ | |
| 1307 105, 84, 88, 116, '\0', /* iTXt */ | |
| 1308 111, 70, 70, 115, '\0', /* oFFs */ | |
| 1309 112, 67, 65, 76, '\0', /* pCAL */ | |
| 1310 112, 72, 89, 115, '\0', /* pHYs */ | |
| 1311 115, 66, 73, 84, '\0', /* sBIT */ | |
| 1312 115, 67, 65, 76, '\0', /* sCAL */ | |
| 1313 115, 80, 76, 84, '\0', /* sPLT */ | |
| 1314 115, 84, 69, 82, '\0', /* sTER */ | |
| 1315 115, 82, 71, 66, '\0', /* sRGB */ | |
| 1316 116, 69, 88, 116, '\0', /* tEXt */ | |
| 1317 116, 73, 77, 69, '\0', /* tIME */ | |
| 1318 122, 84, 88, 116, '\0' /* zTXt */ | |
| 1319 }; | |
| 1320 | |
| 1321 chunk_list = chunks_to_ignore; | |
| 1322 num_chunks = (sizeof chunks_to_ignore)/5; | |
| 1323 } | |
| 1324 | |
| 1325 else /* num_chunks_in > 0 */ | |
| 1326 { | |
| 1327 if (chunk_list == NULL) | |
| 1328 { | |
| 1329 /* Prior to 1.6.0 this was silently ignored, now it is an app_error | |
| 1330 * which can be switched off. | |
| 1331 */ | |
| 1332 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list"); | |
| 1333 return; | |
| 1334 } | |
| 1335 | |
| 1336 num_chunks = num_chunks_in; | |
| 1337 } | |
| 1338 | |
| 1339 old_num_chunks = png_ptr->num_chunk_list; | |
| 1340 if (png_ptr->chunk_list == NULL) | |
| 1341 old_num_chunks = 0; | |
| 1342 | |
| 1343 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow. | |
| 1344 */ | |
| 1345 if (num_chunks + old_num_chunks > UINT_MAX/5) | |
| 1346 { | |
| 1347 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks"); | |
| 1348 return; | |
| 1349 } | |
| 1350 | |
| 1351 /* If these chunks are being reset to the default then no more memory is | |
| 1352 * required because add_one_chunk above doesn't extend the list if the 'keep' | |
| 1353 * parameter is the default. | |
| 1354 */ | |
| 1355 if (keep) | |
| 1356 { | |
| 1357 new_list = png_voidcast(png_bytep, png_malloc(png_ptr, | |
| 1358 5 * (num_chunks + old_num_chunks))); | |
| 1359 | |
| 1360 if (old_num_chunks > 0) | |
| 1361 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks); | |
| 1362 } | |
| 1363 | |
| 1364 else if (old_num_chunks > 0) | |
| 1365 new_list = png_ptr->chunk_list; | |
| 1366 | |
| 1367 else | |
| 1368 new_list = NULL; | |
| 1369 | |
| 1370 /* Add the new chunks together with each one's handling code. If the chunk | |
| 1371 * already exists the code is updated, otherwise the chunk is added to the | |
| 1372 * end. (In libpng 1.6.0 order no longer matters because this code enforces | |
| 1373 * the earlier convention that the last setting is the one that is used.) | |
| 1374 */ | |
| 1375 if (new_list != NULL) | |
| 1376 { | |
| 1377 png_const_bytep inlist; | |
| 1378 png_bytep outlist; | |
| 1379 unsigned int i; | |
| 1380 | |
| 1381 for (i=0; i<num_chunks; ++i) | |
| 1382 old_num_chunks = add_one_chunk(new_list, old_num_chunks, | |
| 1383 chunk_list+5*i, keep); | |
| 1384 | |
| 1385 /* Now remove any spurious 'default' entries. */ | |
| 1386 num_chunks = 0; | |
| 1387 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5) | |
| 1388 if (inlist[4]) | |
| 1389 { | |
| 1390 if (outlist != inlist) | |
| 1391 memcpy(outlist, inlist, 5); | |
| 1392 outlist += 5; | |
| 1393 ++num_chunks; | |
| 1394 } | |
| 1395 | |
| 1396 /* This means the application has removed all the specialized handling. */ | |
| 1397 if (num_chunks == 0) | |
| 1398 { | |
| 1399 if (png_ptr->chunk_list != new_list) | |
| 1400 png_free(png_ptr, new_list); | |
| 1401 | |
| 1402 new_list = NULL; | |
| 1403 } | |
| 1404 } | |
| 1405 | |
| 1406 else | |
| 1407 num_chunks = 0; | |
| 1408 | |
| 1409 png_ptr->num_chunk_list = num_chunks; | |
| 1410 | |
| 1411 if (png_ptr->chunk_list != new_list) | |
| 1412 { | |
| 1413 if (png_ptr->chunk_list != NULL) | |
| 1414 png_free(png_ptr, png_ptr->chunk_list); | |
| 1415 | |
| 1416 png_ptr->chunk_list = new_list; | |
| 1417 } | |
| 1418 } | |
| 1419 #endif | |
| 1420 | |
| 1421 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED | |
| 1422 void PNGAPI | |
| 1423 png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr, | |
| 1424 png_user_chunk_ptr read_user_chunk_fn) | |
| 1425 { | |
| 1426 png_debug(1, "in png_set_read_user_chunk_fn"); | |
| 1427 | |
| 1428 if (png_ptr == NULL) | |
| 1429 return; | |
| 1430 | |
| 1431 png_ptr->read_user_chunk_fn = read_user_chunk_fn; | |
| 1432 png_ptr->user_chunk_ptr = user_chunk_ptr; | |
| 1433 } | |
| 1434 #endif | |
| 1435 | |
| 1436 #ifdef PNG_INFO_IMAGE_SUPPORTED | |
| 1437 void PNGAPI | |
| 1438 png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 1439 png_bytepp row_pointers) | |
| 1440 { | |
| 1441 png_debug1(1, "in %s storage function", "rows"); | |
| 1442 | |
| 1443 if (png_ptr == NULL || info_ptr == NULL) | |
| 1444 return; | |
| 1445 | |
| 1446 if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers)) | |
| 1447 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); | |
| 1448 | |
| 1449 info_ptr->row_pointers = row_pointers; | |
| 1450 | |
| 1451 if (row_pointers) | |
| 1452 info_ptr->valid |= PNG_INFO_IDAT; | |
| 1453 } | |
| 1454 #endif | |
| 1455 | |
| 1456 void PNGAPI | |
| 1457 png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size) | |
| 1458 { | |
| 1459 if (png_ptr == NULL) | |
| 1460 return; | |
| 1461 | |
| 1462 if (size == 0 || size > PNG_UINT_31_MAX) | |
| 1463 png_error(png_ptr, "invalid compression buffer size"); | |
| 1464 | |
| 1465 # ifdef PNG_SEQUENTIAL_READ_SUPPORTED | |
| 1466 if (png_ptr->mode & PNG_IS_READ_STRUCT) | |
| 1467 { | |
| 1468 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */ | |
| 1469 return; | |
| 1470 } | |
| 1471 # endif | |
| 1472 | |
| 1473 # ifdef PNG_WRITE_SUPPORTED | |
| 1474 if (!(png_ptr->mode & PNG_IS_READ_STRUCT)) | |
| 1475 { | |
| 1476 if (png_ptr->zowner != 0) | |
| 1477 { | |
| 1478 png_warning(png_ptr, | |
| 1479 "Compression buffer size cannot be changed because it is in use"); | |
| 1480 return; | |
| 1481 } | |
| 1482 | |
| 1483 if (size > ZLIB_IO_MAX) | |
| 1484 { | |
| 1485 png_warning(png_ptr, | |
| 1486 "Compression buffer size limited to system maximum"); | |
| 1487 size = ZLIB_IO_MAX; /* must fit */ | |
| 1488 } | |
| 1489 | |
| 1490 else if (size < 6) | |
| 1491 { | |
| 1492 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH | |
| 1493 * if this is permitted. | |
| 1494 */ | |
| 1495 png_warning(png_ptr, | |
| 1496 "Compression buffer size cannot be reduced below 6"); | |
| 1497 return; | |
| 1498 } | |
| 1499 | |
| 1500 if (png_ptr->zbuffer_size != size) | |
| 1501 { | |
| 1502 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list); | |
| 1503 png_ptr->zbuffer_size = (uInt)size; | |
| 1504 } | |
| 1505 } | |
| 1506 # endif | |
| 1507 } | |
| 1508 | |
| 1509 void PNGAPI | |
| 1510 png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask) | |
| 1511 { | |
| 1512 if (png_ptr && info_ptr) | |
| 1513 info_ptr->valid &= ~mask; | |
| 1514 } | |
| 1515 | |
| 1516 | |
| 1517 #ifdef PNG_SET_USER_LIMITS_SUPPORTED | |
| 1518 /* This function was added to libpng 1.2.6 */ | |
| 1519 void PNGAPI | |
| 1520 png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max, | |
| 1521 png_uint_32 user_height_max) | |
| 1522 { | |
| 1523 /* Images with dimensions larger than these limits will be | |
| 1524 * rejected by png_set_IHDR(). To accept any PNG datastream | |
| 1525 * regardless of dimensions, set both limits to 0x7ffffffL. | |
| 1526 */ | |
| 1527 if (png_ptr == NULL) | |
| 1528 return; | |
| 1529 | |
| 1530 png_ptr->user_width_max = user_width_max; | |
| 1531 png_ptr->user_height_max = user_height_max; | |
| 1532 } | |
| 1533 | |
| 1534 /* This function was added to libpng 1.4.0 */ | |
| 1535 void PNGAPI | |
| 1536 png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max) | |
| 1537 { | |
| 1538 if (png_ptr) | |
| 1539 png_ptr->user_chunk_cache_max = user_chunk_cache_max; | |
| 1540 } | |
| 1541 | |
| 1542 /* This function was added to libpng 1.4.1 */ | |
| 1543 void PNGAPI | |
| 1544 png_set_chunk_malloc_max (png_structrp png_ptr, | |
| 1545 png_alloc_size_t user_chunk_malloc_max) | |
| 1546 { | |
| 1547 if (png_ptr) | |
| 1548 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max; | |
| 1549 } | |
| 1550 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */ | |
| 1551 | |
| 1552 | |
| 1553 #ifdef PNG_BENIGN_ERRORS_SUPPORTED | |
| 1554 void PNGAPI | |
| 1555 png_set_benign_errors(png_structrp png_ptr, int allowed) | |
| 1556 { | |
| 1557 png_debug(1, "in png_set_benign_errors"); | |
| 1558 | |
| 1559 /* If allowed is 1, png_benign_error() is treated as a warning. | |
| 1560 * | |
| 1561 * If allowed is 0, png_benign_error() is treated as an error (which | |
| 1562 * is the default behavior if png_set_benign_errors() is not called). | |
| 1563 */ | |
| 1564 | |
| 1565 if (allowed) | |
| 1566 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN | | |
| 1567 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN; | |
| 1568 | |
| 1569 else | |
| 1570 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN | | |
| 1571 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN); | |
| 1572 } | |
| 1573 #endif /* PNG_BENIGN_ERRORS_SUPPORTED */ | |
| 1574 | |
| 1575 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED | |
| 1576 /* Whether to report invalid palette index; added at libng-1.5.10. | |
| 1577 * It is possible for an indexed (color-type==3) PNG file to contain | |
| 1578 * pixels with invalid (out-of-range) indexes if the PLTE chunk has | |
| 1579 * fewer entries than the image's bit-depth would allow. We recover | |
| 1580 * from this gracefully by filling any incomplete palette with zeroes | |
| 1581 * (opaque black). By default, when this occurs libpng will issue | |
| 1582 * a benign error. This API can be used to override that behavior. | |
| 1583 */ | |
| 1584 void PNGAPI | |
| 1585 png_set_check_for_invalid_index(png_structrp png_ptr, int allowed) | |
| 1586 { | |
| 1587 png_debug(1, "in png_set_check_for_invalid_index"); | |
| 1588 | |
| 1589 if (allowed > 0) | |
| 1590 png_ptr->num_palette_max = 0; | |
| 1591 | |
| 1592 else | |
| 1593 png_ptr->num_palette_max = -1; | |
| 1594 } | |
| 1595 #endif | |
| 1596 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1591483003:
XFA: Upgrade libpng to 1.6.20. (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@xfa