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| 1 | |
| 2 /* pngset.c - storage of image information into info struct | |
| 3 * | |
| 4 * Last changed in libpng 1.6.19 [November 12, 2015] | |
| 5 * Copyright (c) 1998-2015 Glenn Randers-Pehrson | |
| 6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) | |
| 7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) | |
| 8 * | |
| 9 * This code is released under the libpng license. | |
| 10 * For conditions of distribution and use, see the disclaimer | |
| 11 * and license in png.h | |
| 12 * | |
| 13 * The functions here are used during reads to store data from the file | |
| 14 * into the info struct, and during writes to store application data | |
| 15 * into the info struct for writing into the file. This abstracts the | |
| 16 * info struct and allows us to change the structure in the future. | |
| 17 */ | |
| 18 | |
| 19 #include "pngpriv.h" | |
| 20 | |
| 21 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) | |
| 22 | |
| 23 #ifdef PNG_bKGD_SUPPORTED | |
| 24 void PNGAPI | |
| 25 png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 26 png_const_color_16p background) | |
| 27 { | |
| 28 png_debug1(1, "in %s storage function", "bKGD"); | |
| 29 | |
| 30 if (png_ptr == NULL || info_ptr == NULL || background == NULL) | |
| 31 return; | |
| 32 | |
| 33 info_ptr->background = *background; | |
| 34 info_ptr->valid |= PNG_INFO_bKGD; | |
| 35 } | |
| 36 #endif | |
| 37 | |
| 38 #ifdef PNG_cHRM_SUPPORTED | |
| 39 void PNGFAPI | |
| 40 png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 41 png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, | |
| 42 png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, | |
| 43 png_fixed_point blue_x, png_fixed_point blue_y) | |
| 44 { | |
| 45 png_xy xy; | |
| 46 | |
| 47 png_debug1(1, "in %s storage function", "cHRM fixed"); | |
| 48 | |
| 49 if (png_ptr == NULL || info_ptr == NULL) | |
| 50 return; | |
| 51 | |
| 52 xy.redx = red_x; | |
| 53 xy.redy = red_y; | |
| 54 xy.greenx = green_x; | |
| 55 xy.greeny = green_y; | |
| 56 xy.bluex = blue_x; | |
| 57 xy.bluey = blue_y; | |
| 58 xy.whitex = white_x; | |
| 59 xy.whitey = white_y; | |
| 60 | |
| 61 if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy, | |
| 62 2/* override with app values*/) != 0) | |
| 63 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; | |
| 64 | |
| 65 png_colorspace_sync_info(png_ptr, info_ptr); | |
| 66 } | |
| 67 | |
| 68 void PNGFAPI | |
| 69 png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 70 png_fixed_point int_red_X, png_fixed_point int_red_Y, | |
| 71 png_fixed_point int_red_Z, png_fixed_point int_green_X, | |
| 72 png_fixed_point int_green_Y, png_fixed_point int_green_Z, | |
| 73 png_fixed_point int_blue_X, png_fixed_point int_blue_Y, | |
| 74 png_fixed_point int_blue_Z) | |
| 75 { | |
| 76 png_XYZ XYZ; | |
| 77 | |
| 78 png_debug1(1, "in %s storage function", "cHRM XYZ fixed"); | |
| 79 | |
| 80 if (png_ptr == NULL || info_ptr == NULL) | |
| 81 return; | |
| 82 | |
| 83 XYZ.red_X = int_red_X; | |
| 84 XYZ.red_Y = int_red_Y; | |
| 85 XYZ.red_Z = int_red_Z; | |
| 86 XYZ.green_X = int_green_X; | |
| 87 XYZ.green_Y = int_green_Y; | |
| 88 XYZ.green_Z = int_green_Z; | |
| 89 XYZ.blue_X = int_blue_X; | |
| 90 XYZ.blue_Y = int_blue_Y; | |
| 91 XYZ.blue_Z = int_blue_Z; | |
| 92 | |
| 93 if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace, | |
| 94 &XYZ, 2) != 0) | |
| 95 info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; | |
| 96 | |
| 97 png_colorspace_sync_info(png_ptr, info_ptr); | |
| 98 } | |
| 99 | |
| 100 # ifdef PNG_FLOATING_POINT_SUPPORTED | |
| 101 void PNGAPI | |
| 102 png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 103 double white_x, double white_y, double red_x, double red_y, | |
| 104 double green_x, double green_y, double blue_x, double blue_y) | |
| 105 { | |
| 106 png_set_cHRM_fixed(png_ptr, info_ptr, | |
| 107 png_fixed(png_ptr, white_x, "cHRM White X"), | |
| 108 png_fixed(png_ptr, white_y, "cHRM White Y"), | |
| 109 png_fixed(png_ptr, red_x, "cHRM Red X"), | |
| 110 png_fixed(png_ptr, red_y, "cHRM Red Y"), | |
| 111 png_fixed(png_ptr, green_x, "cHRM Green X"), | |
| 112 png_fixed(png_ptr, green_y, "cHRM Green Y"), | |
| 113 png_fixed(png_ptr, blue_x, "cHRM Blue X"), | |
| 114 png_fixed(png_ptr, blue_y, "cHRM Blue Y")); | |
| 115 } | |
| 116 | |
| 117 void PNGAPI | |
| 118 png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X, | |
| 119 double red_Y, double red_Z, double green_X, double green_Y, double green_Z, | |
| 120 double blue_X, double blue_Y, double blue_Z) | |
| 121 { | |
| 122 png_set_cHRM_XYZ_fixed(png_ptr, info_ptr, | |
| 123 png_fixed(png_ptr, red_X, "cHRM Red X"), | |
| 124 png_fixed(png_ptr, red_Y, "cHRM Red Y"), | |
| 125 png_fixed(png_ptr, red_Z, "cHRM Red Z"), | |
| 126 png_fixed(png_ptr, green_X, "cHRM Green X"), | |
| 127 png_fixed(png_ptr, green_Y, "cHRM Green Y"), | |
| 128 png_fixed(png_ptr, green_Z, "cHRM Green Z"), | |
| 129 png_fixed(png_ptr, blue_X, "cHRM Blue X"), | |
| 130 png_fixed(png_ptr, blue_Y, "cHRM Blue Y"), | |
| 131 png_fixed(png_ptr, blue_Z, "cHRM Blue Z")); | |
| 132 } | |
| 133 # endif /* FLOATING_POINT */ | |
| 134 | |
| 135 #endif /* cHRM */ | |
| 136 | |
| 137 #ifdef PNG_gAMA_SUPPORTED | |
| 138 void PNGFAPI | |
| 139 png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 140 png_fixed_point file_gamma) | |
| 141 { | |
| 142 png_debug1(1, "in %s storage function", "gAMA"); | |
| 143 | |
| 144 if (png_ptr == NULL || info_ptr == NULL) | |
| 145 return; | |
| 146 | |
| 147 png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma); | |
| 148 png_colorspace_sync_info(png_ptr, info_ptr); | |
| 149 } | |
| 150 | |
| 151 # ifdef PNG_FLOATING_POINT_SUPPORTED | |
| 152 void PNGAPI | |
| 153 png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma) | |
| 154 { | |
| 155 png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma, | |
| 156 "png_set_gAMA")); | |
| 157 } | |
| 158 # endif | |
| 159 #endif | |
| 160 | |
| 161 #ifdef PNG_hIST_SUPPORTED | |
| 162 void PNGAPI | |
| 163 png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 164 png_const_uint_16p hist) | |
| 165 { | |
| 166 int i; | |
| 167 | |
| 168 png_debug1(1, "in %s storage function", "hIST"); | |
| 169 | |
| 170 if (png_ptr == NULL || info_ptr == NULL) | |
| 171 return; | |
| 172 | |
| 173 if (info_ptr->num_palette == 0 || info_ptr->num_palette | |
| 174 > PNG_MAX_PALETTE_LENGTH) | |
| 175 { | |
| 176 png_warning(png_ptr, | |
| 177 "Invalid palette size, hIST allocation skipped"); | |
| 178 | |
| 179 return; | |
| 180 } | |
| 181 | |
| 182 png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0); | |
| 183 | |
| 184 /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in | |
| 185 * version 1.2.1 | |
| 186 */ | |
| 187 info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr, | |
| 188 PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16)))); | |
| 189 | |
| 190 if (info_ptr->hist == NULL) | |
| 191 { | |
| 192 png_warning(png_ptr, "Insufficient memory for hIST chunk data"); | |
| 193 | |
| 194 return; | |
| 195 } | |
| 196 | |
| 197 info_ptr->free_me |= PNG_FREE_HIST; | |
| 198 | |
| 199 for (i = 0; i < info_ptr->num_palette; i++) | |
| 200 info_ptr->hist[i] = hist[i]; | |
| 201 | |
| 202 info_ptr->valid |= PNG_INFO_hIST; | |
| 203 } | |
| 204 #endif | |
| 205 | |
| 206 void PNGAPI | |
| 207 png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 208 png_uint_32 width, png_uint_32 height, int bit_depth, | |
| 209 int color_type, int interlace_type, int compression_type, | |
| 210 int filter_type) | |
| 211 { | |
| 212 png_debug1(1, "in %s storage function", "IHDR"); | |
| 213 | |
| 214 if (png_ptr == NULL || info_ptr == NULL) | |
| 215 return; | |
| 216 | |
| 217 info_ptr->width = width; | |
| 218 info_ptr->height = height; | |
| 219 info_ptr->bit_depth = (png_byte)bit_depth; | |
| 220 info_ptr->color_type = (png_byte)color_type; | |
| 221 info_ptr->compression_type = (png_byte)compression_type; | |
| 222 info_ptr->filter_type = (png_byte)filter_type; | |
| 223 info_ptr->interlace_type = (png_byte)interlace_type; | |
| 224 | |
| 225 png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height, | |
| 226 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type, | |
| 227 info_ptr->compression_type, info_ptr->filter_type); | |
| 228 | |
| 229 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) | |
| 230 info_ptr->channels = 1; | |
| 231 | |
| 232 else if ((info_ptr->color_type & PNG_COLOR_MASK_COLOR) != 0) | |
| 233 info_ptr->channels = 3; | |
| 234 | |
| 235 else | |
| 236 info_ptr->channels = 1; | |
| 237 | |
| 238 if ((info_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0) | |
| 239 info_ptr->channels++; | |
| 240 | |
| 241 info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth); | |
| 242 | |
| 243 info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width); | |
| 244 } | |
| 245 | |
| 246 #ifdef PNG_oFFs_SUPPORTED | |
| 247 void PNGAPI | |
| 248 png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 249 png_int_32 offset_x, png_int_32 offset_y, int unit_type) | |
| 250 { | |
| 251 png_debug1(1, "in %s storage function", "oFFs"); | |
| 252 | |
| 253 if (png_ptr == NULL || info_ptr == NULL) | |
| 254 return; | |
| 255 | |
| 256 info_ptr->x_offset = offset_x; | |
| 257 info_ptr->y_offset = offset_y; | |
| 258 info_ptr->offset_unit_type = (png_byte)unit_type; | |
| 259 info_ptr->valid |= PNG_INFO_oFFs; | |
| 260 } | |
| 261 #endif | |
| 262 | |
| 263 #ifdef PNG_pCAL_SUPPORTED | |
| 264 void PNGAPI | |
| 265 png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 266 png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, | |
| 267 int nparams, png_const_charp units, png_charpp params) | |
| 268 { | |
| 269 png_size_t length; | |
| 270 int i; | |
| 271 | |
| 272 png_debug1(1, "in %s storage function", "pCAL"); | |
| 273 | |
| 274 if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL | |
| 275 || (nparams > 0 && params == NULL)) | |
| 276 return; | |
| 277 | |
| 278 length = strlen(purpose) + 1; | |
| 279 png_debug1(3, "allocating purpose for info (%lu bytes)", | |
| 280 (unsigned long)length); | |
| 281 | |
| 282 /* TODO: validate format of calibration name and unit name */ | |
| 283 | |
| 284 /* Check that the type matches the specification. */ | |
| 285 if (type < 0 || type > 3) | |
| 286 png_error(png_ptr, "Invalid pCAL equation type"); | |
| 287 | |
| 288 if (nparams < 0 || nparams > 255) | |
| 289 png_error(png_ptr, "Invalid pCAL parameter count"); | |
| 290 | |
| 291 /* Validate params[nparams] */ | |
| 292 for (i=0; i<nparams; ++i) | |
| 293 { | |
| 294 if (params[i] == NULL || | |
| 295 !png_check_fp_string(params[i], strlen(params[i]))) | |
| 296 png_error(png_ptr, "Invalid format for pCAL parameter"); | |
| 297 } | |
| 298 | |
| 299 info_ptr->pcal_purpose = png_voidcast(png_charp, | |
| 300 png_malloc_warn(png_ptr, length)); | |
| 301 | |
| 302 if (info_ptr->pcal_purpose == NULL) | |
| 303 { | |
| 304 png_warning(png_ptr, "Insufficient memory for pCAL purpose"); | |
| 305 | |
| 306 return; | |
| 307 } | |
| 308 | |
| 309 memcpy(info_ptr->pcal_purpose, purpose, length); | |
| 310 | |
| 311 png_debug(3, "storing X0, X1, type, and nparams in info"); | |
| 312 info_ptr->pcal_X0 = X0; | |
| 313 info_ptr->pcal_X1 = X1; | |
| 314 info_ptr->pcal_type = (png_byte)type; | |
| 315 info_ptr->pcal_nparams = (png_byte)nparams; | |
| 316 | |
| 317 length = strlen(units) + 1; | |
| 318 png_debug1(3, "allocating units for info (%lu bytes)", | |
| 319 (unsigned long)length); | |
| 320 | |
| 321 info_ptr->pcal_units = png_voidcast(png_charp, | |
| 322 png_malloc_warn(png_ptr, length)); | |
| 323 | |
| 324 if (info_ptr->pcal_units == NULL) | |
| 325 { | |
| 326 png_warning(png_ptr, "Insufficient memory for pCAL units"); | |
| 327 | |
| 328 return; | |
| 329 } | |
| 330 | |
| 331 memcpy(info_ptr->pcal_units, units, length); | |
| 332 | |
| 333 info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr, | |
| 334 (png_size_t)((nparams + 1) * (sizeof (png_charp))))); | |
| 335 | |
| 336 if (info_ptr->pcal_params == NULL) | |
| 337 { | |
| 338 png_warning(png_ptr, "Insufficient memory for pCAL params"); | |
| 339 | |
| 340 return; | |
| 341 } | |
| 342 | |
| 343 memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp))); | |
| 344 | |
| 345 for (i = 0; i < nparams; i++) | |
| 346 { | |
| 347 length = strlen(params[i]) + 1; | |
| 348 png_debug2(3, "allocating parameter %d for info (%lu bytes)", i, | |
| 349 (unsigned long)length); | |
| 350 | |
| 351 info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length); | |
| 352 | |
| 353 if (info_ptr->pcal_params[i] == NULL) | |
| 354 { | |
| 355 png_warning(png_ptr, "Insufficient memory for pCAL parameter"); | |
| 356 | |
| 357 return; | |
| 358 } | |
| 359 | |
| 360 memcpy(info_ptr->pcal_params[i], params[i], length); | |
| 361 } | |
| 362 | |
| 363 info_ptr->valid |= PNG_INFO_pCAL; | |
| 364 info_ptr->free_me |= PNG_FREE_PCAL; | |
| 365 } | |
| 366 #endif | |
| 367 | |
| 368 #ifdef PNG_sCAL_SUPPORTED | |
| 369 void PNGAPI | |
| 370 png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 371 int unit, png_const_charp swidth, png_const_charp sheight) | |
| 372 { | |
| 373 png_size_t lengthw = 0, lengthh = 0; | |
| 374 | |
| 375 png_debug1(1, "in %s storage function", "sCAL"); | |
| 376 | |
| 377 if (png_ptr == NULL || info_ptr == NULL) | |
| 378 return; | |
| 379 | |
| 380 /* Double check the unit (should never get here with an invalid | |
| 381 * unit unless this is an API call.) | |
| 382 */ | |
| 383 if (unit != 1 && unit != 2) | |
| 384 png_error(png_ptr, "Invalid sCAL unit"); | |
| 385 | |
| 386 if (swidth == NULL || (lengthw = strlen(swidth)) == 0 || | |
| 387 swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw)) | |
| 388 png_error(png_ptr, "Invalid sCAL width"); | |
| 389 | |
| 390 if (sheight == NULL || (lengthh = strlen(sheight)) == 0 || | |
| 391 sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh)) | |
| 392 png_error(png_ptr, "Invalid sCAL height"); | |
| 393 | |
| 394 info_ptr->scal_unit = (png_byte)unit; | |
| 395 | |
| 396 ++lengthw; | |
| 397 | |
| 398 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw); | |
| 399 | |
| 400 info_ptr->scal_s_width = png_voidcast(png_charp, | |
| 401 png_malloc_warn(png_ptr, lengthw)); | |
| 402 | |
| 403 if (info_ptr->scal_s_width == NULL) | |
| 404 { | |
| 405 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); | |
| 406 | |
| 407 return; | |
| 408 } | |
| 409 | |
| 410 memcpy(info_ptr->scal_s_width, swidth, lengthw); | |
| 411 | |
| 412 ++lengthh; | |
| 413 | |
| 414 png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh); | |
| 415 | |
| 416 info_ptr->scal_s_height = png_voidcast(png_charp, | |
| 417 png_malloc_warn(png_ptr, lengthh)); | |
| 418 | |
| 419 if (info_ptr->scal_s_height == NULL) | |
| 420 { | |
| 421 png_free (png_ptr, info_ptr->scal_s_width); | |
| 422 info_ptr->scal_s_width = NULL; | |
| 423 | |
| 424 png_warning(png_ptr, "Memory allocation failed while processing sCAL"); | |
| 425 | |
| 426 return; | |
| 427 } | |
| 428 | |
| 429 memcpy(info_ptr->scal_s_height, sheight, lengthh); | |
| 430 | |
| 431 info_ptr->valid |= PNG_INFO_sCAL; | |
| 432 info_ptr->free_me |= PNG_FREE_SCAL; | |
| 433 } | |
| 434 | |
| 435 # ifdef PNG_FLOATING_POINT_SUPPORTED | |
| 436 void PNGAPI | |
| 437 png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit, | |
| 438 double width, double height) | |
| 439 { | |
| 440 png_debug1(1, "in %s storage function", "sCAL"); | |
| 441 | |
| 442 /* Check the arguments. */ | |
| 443 if (width <= 0) | |
| 444 png_warning(png_ptr, "Invalid sCAL width ignored"); | |
| 445 | |
| 446 else if (height <= 0) | |
| 447 png_warning(png_ptr, "Invalid sCAL height ignored"); | |
| 448 | |
| 449 else | |
| 450 { | |
| 451 /* Convert 'width' and 'height' to ASCII. */ | |
| 452 char swidth[PNG_sCAL_MAX_DIGITS+1]; | |
| 453 char sheight[PNG_sCAL_MAX_DIGITS+1]; | |
| 454 | |
| 455 png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width, | |
| 456 PNG_sCAL_PRECISION); | |
| 457 png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height, | |
| 458 PNG_sCAL_PRECISION); | |
| 459 | |
| 460 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); | |
| 461 } | |
| 462 } | |
| 463 # endif | |
| 464 | |
| 465 # ifdef PNG_FIXED_POINT_SUPPORTED | |
| 466 void PNGAPI | |
| 467 png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit, | |
| 468 png_fixed_point width, png_fixed_point height) | |
| 469 { | |
| 470 png_debug1(1, "in %s storage function", "sCAL"); | |
| 471 | |
| 472 /* Check the arguments. */ | |
| 473 if (width <= 0) | |
| 474 png_warning(png_ptr, "Invalid sCAL width ignored"); | |
| 475 | |
| 476 else if (height <= 0) | |
| 477 png_warning(png_ptr, "Invalid sCAL height ignored"); | |
| 478 | |
| 479 else | |
| 480 { | |
| 481 /* Convert 'width' and 'height' to ASCII. */ | |
| 482 char swidth[PNG_sCAL_MAX_DIGITS+1]; | |
| 483 char sheight[PNG_sCAL_MAX_DIGITS+1]; | |
| 484 | |
| 485 png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width); | |
| 486 png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height); | |
| 487 | |
| 488 png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); | |
| 489 } | |
| 490 } | |
| 491 # endif | |
| 492 #endif | |
| 493 | |
| 494 #ifdef PNG_pHYs_SUPPORTED | |
| 495 void PNGAPI | |
| 496 png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 497 png_uint_32 res_x, png_uint_32 res_y, int unit_type) | |
| 498 { | |
| 499 png_debug1(1, "in %s storage function", "pHYs"); | |
| 500 | |
| 501 if (png_ptr == NULL || info_ptr == NULL) | |
| 502 return; | |
| 503 | |
| 504 info_ptr->x_pixels_per_unit = res_x; | |
| 505 info_ptr->y_pixels_per_unit = res_y; | |
| 506 info_ptr->phys_unit_type = (png_byte)unit_type; | |
| 507 info_ptr->valid |= PNG_INFO_pHYs; | |
| 508 } | |
| 509 #endif | |
| 510 | |
| 511 void PNGAPI | |
| 512 png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr, | |
| 513 png_const_colorp palette, int num_palette) | |
| 514 { | |
| 515 | |
| 516 png_uint_32 max_palette_length; | |
| 517 | |
| 518 png_debug1(1, "in %s storage function", "PLTE"); | |
| 519 | |
| 520 if (png_ptr == NULL || info_ptr == NULL) | |
| 521 return; | |
| 522 | |
| 523 max_palette_length = (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ? | |
| 524 (1 << info_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH; | |
| 525 | |
| 526 if (num_palette < 0 || num_palette > (int) max_palette_length) | |
| 527 { | |
| 528 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) | |
| 529 png_error(png_ptr, "Invalid palette length"); | |
| 530 | |
| 531 else | |
| 532 { | |
| 533 png_warning(png_ptr, "Invalid palette length"); | |
| 534 | |
| 535 return; | |
| 536 } | |
| 537 } | |
| 538 | |
| 539 if ((num_palette > 0 && palette == NULL) || | |
| 540 (num_palette == 0 | |
| 541 # ifdef PNG_MNG_FEATURES_SUPPORTED | |
| 542 && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 | |
| 543 # endif | |
| 544 )) | |
| 545 { | |
| 546 png_error(png_ptr, "Invalid palette"); | |
| 547 } | |
| 548 | |
| 549 /* It may not actually be necessary to set png_ptr->palette here; | |
| 550 * we do it for backward compatibility with the way the png_handle_tRNS | |
| 551 * function used to do the allocation. | |
| 552 * | |
| 553 * 1.6.0: the above statement appears to be incorrect; something has to set | |
| 554 * the palette inside png_struct on read. | |
| 555 */ | |
| 556 png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); | |
| 557 | |
| 558 /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead | |
| 559 * of num_palette entries, in case of an invalid PNG file or incorrect | |
| 560 * call to png_set_PLTE() with too-large sample values. | |
| 561 */ | |
| 562 png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr, | |
| 563 PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)))); | |
| 564 | |
| 565 if (num_palette > 0) | |
| 566 memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color))); | |
| 567 info_ptr->palette = png_ptr->palette; | |
| 568 info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; | |
| 569 | |
| 570 info_ptr->free_me |= PNG_FREE_PLTE; | |
| 571 | |
| 572 info_ptr->valid |= PNG_INFO_PLTE; | |
| 573 } | |
| 574 | |
| 575 #ifdef PNG_sBIT_SUPPORTED | |
| 576 void PNGAPI | |
| 577 png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 578 png_const_color_8p sig_bit) | |
| 579 { | |
| 580 png_debug1(1, "in %s storage function", "sBIT"); | |
| 581 | |
| 582 if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL) | |
| 583 return; | |
| 584 | |
| 585 info_ptr->sig_bit = *sig_bit; | |
| 586 info_ptr->valid |= PNG_INFO_sBIT; | |
| 587 } | |
| 588 #endif | |
| 589 | |
| 590 #ifdef PNG_sRGB_SUPPORTED | |
| 591 void PNGAPI | |
| 592 png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent) | |
| 593 { | |
| 594 png_debug1(1, "in %s storage function", "sRGB"); | |
| 595 | |
| 596 if (png_ptr == NULL || info_ptr == NULL) | |
| 597 return; | |
| 598 | |
| 599 (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent); | |
| 600 png_colorspace_sync_info(png_ptr, info_ptr); | |
| 601 } | |
| 602 | |
| 603 void PNGAPI | |
| 604 png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 605 int srgb_intent) | |
| 606 { | |
| 607 png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM"); | |
| 608 | |
| 609 if (png_ptr == NULL || info_ptr == NULL) | |
| 610 return; | |
| 611 | |
| 612 if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, | |
| 613 srgb_intent) != 0) | |
| 614 { | |
| 615 /* This causes the gAMA and cHRM to be written too */ | |
| 616 info_ptr->colorspace.flags |= | |
| 617 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; | |
| 618 } | |
| 619 | |
| 620 png_colorspace_sync_info(png_ptr, info_ptr); | |
| 621 } | |
| 622 #endif /* sRGB */ | |
| 623 | |
| 624 | |
| 625 #ifdef PNG_iCCP_SUPPORTED | |
| 626 void PNGAPI | |
| 627 png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 628 png_const_charp name, int compression_type, | |
| 629 png_const_bytep profile, png_uint_32 proflen) | |
| 630 { | |
| 631 png_charp new_iccp_name; | |
| 632 png_bytep new_iccp_profile; | |
| 633 png_size_t length; | |
| 634 | |
| 635 png_debug1(1, "in %s storage function", "iCCP"); | |
| 636 | |
| 637 if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL) | |
| 638 return; | |
| 639 | |
| 640 if (compression_type != PNG_COMPRESSION_TYPE_BASE) | |
| 641 png_app_error(png_ptr, "Invalid iCCP compression method"); | |
| 642 | |
| 643 /* Set the colorspace first because this validates the profile; do not | |
| 644 * override previously set app cHRM or gAMA here (because likely as not the | |
| 645 * application knows better than libpng what the correct values are.) Pass | |
| 646 * the info_ptr color_type field to png_colorspace_set_ICC because in the | |
| 647 * write case it has not yet been stored in png_ptr. | |
| 648 */ | |
| 649 { | |
| 650 int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name, | |
| 651 proflen, profile, info_ptr->color_type); | |
| 652 | |
| 653 png_colorspace_sync_info(png_ptr, info_ptr); | |
| 654 | |
| 655 /* Don't do any of the copying if the profile was bad, or inconsistent. */ | |
| 656 if (result == 0) | |
| 657 return; | |
| 658 | |
| 659 /* But do write the gAMA and cHRM chunks from the profile. */ | |
| 660 info_ptr->colorspace.flags |= | |
| 661 PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; | |
| 662 } | |
| 663 | |
| 664 length = strlen(name)+1; | |
| 665 new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length)); | |
| 666 | |
| 667 if (new_iccp_name == NULL) | |
| 668 { | |
| 669 png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk"); | |
| 670 | |
| 671 return; | |
| 672 } | |
| 673 | |
| 674 memcpy(new_iccp_name, name, length); | |
| 675 new_iccp_profile = png_voidcast(png_bytep, | |
| 676 png_malloc_warn(png_ptr, proflen)); | |
| 677 | |
| 678 if (new_iccp_profile == NULL) | |
| 679 { | |
| 680 png_free(png_ptr, new_iccp_name); | |
| 681 png_benign_error(png_ptr, | |
| 682 "Insufficient memory to process iCCP profile"); | |
| 683 | |
| 684 return; | |
| 685 } | |
| 686 | |
| 687 memcpy(new_iccp_profile, profile, proflen); | |
| 688 | |
| 689 png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0); | |
| 690 | |
| 691 info_ptr->iccp_proflen = proflen; | |
| 692 info_ptr->iccp_name = new_iccp_name; | |
| 693 info_ptr->iccp_profile = new_iccp_profile; | |
| 694 info_ptr->free_me |= PNG_FREE_ICCP; | |
| 695 info_ptr->valid |= PNG_INFO_iCCP; | |
| 696 } | |
| 697 #endif | |
| 698 | |
| 699 #ifdef PNG_TEXT_SUPPORTED | |
| 700 void PNGAPI | |
| 701 png_set_text(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 702 png_const_textp text_ptr, int num_text) | |
| 703 { | |
| 704 int ret; | |
| 705 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text); | |
| 706 | |
| 707 if (ret != 0) | |
| 708 png_error(png_ptr, "Insufficient memory to store text"); | |
| 709 } | |
| 710 | |
| 711 int /* PRIVATE */ | |
| 712 png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 713 png_const_textp text_ptr, int num_text) | |
| 714 { | |
| 715 int i; | |
| 716 | |
| 717 png_debug1(1, "in %lx storage function", png_ptr == NULL ? 0xabadca11U : | |
| 718 (unsigned long)png_ptr->chunk_name); | |
| 719 | |
| 720 if (png_ptr == NULL || info_ptr == NULL || num_text <= 0 || text_ptr == NULL) | |
| 721 return(0); | |
| 722 | |
| 723 /* Make sure we have enough space in the "text" array in info_struct | |
| 724 * to hold all of the incoming text_ptr objects. This compare can't overflow | |
| 725 * because max_text >= num_text (anyway, subtract of two positive integers | |
| 726 * can't overflow in any case.) | |
| 727 */ | |
| 728 if (num_text > info_ptr->max_text - info_ptr->num_text) | |
| 729 { | |
| 730 int old_num_text = info_ptr->num_text; | |
| 731 int max_text; | |
| 732 png_textp new_text = NULL; | |
| 733 | |
| 734 /* Calculate an appropriate max_text, checking for overflow. */ | |
| 735 max_text = old_num_text; | |
| 736 if (num_text <= INT_MAX - max_text) | |
| 737 { | |
| 738 max_text += num_text; | |
| 739 | |
| 740 /* Round up to a multiple of 8 */ | |
| 741 if (max_text < INT_MAX-8) | |
| 742 max_text = (max_text + 8) & ~0x7; | |
| 743 | |
| 744 else | |
| 745 max_text = INT_MAX; | |
| 746 | |
| 747 /* Now allocate a new array and copy the old members in; this does all | |
| 748 * the overflow checks. | |
| 749 */ | |
| 750 new_text = png_voidcast(png_textp,png_realloc_array(png_ptr, | |
| 751 info_ptr->text, old_num_text, max_text-old_num_text, | |
| 752 sizeof *new_text)); | |
| 753 } | |
| 754 | |
| 755 if (new_text == NULL) | |
| 756 { | |
| 757 png_chunk_report(png_ptr, "too many text chunks", | |
| 758 PNG_CHUNK_WRITE_ERROR); | |
| 759 | |
| 760 return 1; | |
| 761 } | |
| 762 | |
| 763 png_free(png_ptr, info_ptr->text); | |
| 764 | |
| 765 info_ptr->text = new_text; | |
| 766 info_ptr->free_me |= PNG_FREE_TEXT; | |
| 767 info_ptr->max_text = max_text; | |
| 768 /* num_text is adjusted below as the entries are copied in */ | |
| 769 | |
| 770 png_debug1(3, "allocated %d entries for info_ptr->text", max_text); | |
| 771 } | |
| 772 | |
| 773 for (i = 0; i < num_text; i++) | |
| 774 { | |
| 775 size_t text_length, key_len; | |
| 776 size_t lang_len, lang_key_len; | |
| 777 png_textp textp = &(info_ptr->text[info_ptr->num_text]); | |
| 778 | |
| 779 if (text_ptr[i].key == NULL) | |
| 780 continue; | |
| 781 | |
| 782 if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE || | |
| 783 text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST) | |
| 784 { | |
| 785 png_chunk_report(png_ptr, "text compression mode is out of range", | |
| 786 PNG_CHUNK_WRITE_ERROR); | |
| 787 continue; | |
| 788 } | |
| 789 | |
| 790 key_len = strlen(text_ptr[i].key); | |
| 791 | |
| 792 if (text_ptr[i].compression <= 0) | |
| 793 { | |
| 794 lang_len = 0; | |
| 795 lang_key_len = 0; | |
| 796 } | |
| 797 | |
| 798 else | |
| 799 # ifdef PNG_iTXt_SUPPORTED | |
| 800 { | |
| 801 /* Set iTXt data */ | |
| 802 | |
| 803 if (text_ptr[i].lang != NULL) | |
| 804 lang_len = strlen(text_ptr[i].lang); | |
| 805 | |
| 806 else | |
| 807 lang_len = 0; | |
| 808 | |
| 809 if (text_ptr[i].lang_key != NULL) | |
| 810 lang_key_len = strlen(text_ptr[i].lang_key); | |
| 811 | |
| 812 else | |
| 813 lang_key_len = 0; | |
| 814 } | |
| 815 # else /* iTXt */ | |
| 816 { | |
| 817 png_chunk_report(png_ptr, "iTXt chunk not supported", | |
| 818 PNG_CHUNK_WRITE_ERROR); | |
| 819 continue; | |
| 820 } | |
| 821 # endif | |
| 822 | |
| 823 if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0') | |
| 824 { | |
| 825 text_length = 0; | |
| 826 # ifdef PNG_iTXt_SUPPORTED | |
| 827 if (text_ptr[i].compression > 0) | |
| 828 textp->compression = PNG_ITXT_COMPRESSION_NONE; | |
| 829 | |
| 830 else | |
| 831 # endif | |
| 832 textp->compression = PNG_TEXT_COMPRESSION_NONE; | |
| 833 } | |
| 834 | |
| 835 else | |
| 836 { | |
| 837 text_length = strlen(text_ptr[i].text); | |
| 838 textp->compression = text_ptr[i].compression; | |
| 839 } | |
| 840 | |
| 841 textp->key = png_voidcast(png_charp,png_malloc_base(png_ptr, | |
| 842 key_len + text_length + lang_len + lang_key_len + 4)); | |
| 843 | |
| 844 if (textp->key == NULL) | |
| 845 { | |
| 846 png_chunk_report(png_ptr, "text chunk: out of memory", | |
| 847 PNG_CHUNK_WRITE_ERROR); | |
| 848 | |
| 849 return 1; | |
| 850 } | |
| 851 | |
| 852 png_debug2(2, "Allocated %lu bytes at %p in png_set_text", | |
| 853 (unsigned long)(png_uint_32) | |
| 854 (key_len + lang_len + lang_key_len + text_length + 4), | |
| 855 textp->key); | |
| 856 | |
| 857 memcpy(textp->key, text_ptr[i].key, key_len); | |
| 858 *(textp->key + key_len) = '\0'; | |
| 859 | |
| 860 if (text_ptr[i].compression > 0) | |
| 861 { | |
| 862 textp->lang = textp->key + key_len + 1; | |
| 863 memcpy(textp->lang, text_ptr[i].lang, lang_len); | |
| 864 *(textp->lang + lang_len) = '\0'; | |
| 865 textp->lang_key = textp->lang + lang_len + 1; | |
| 866 memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); | |
| 867 *(textp->lang_key + lang_key_len) = '\0'; | |
| 868 textp->text = textp->lang_key + lang_key_len + 1; | |
| 869 } | |
| 870 | |
| 871 else | |
| 872 { | |
| 873 textp->lang=NULL; | |
| 874 textp->lang_key=NULL; | |
| 875 textp->text = textp->key + key_len + 1; | |
| 876 } | |
| 877 | |
| 878 if (text_length != 0) | |
| 879 memcpy(textp->text, text_ptr[i].text, text_length); | |
| 880 | |
| 881 *(textp->text + text_length) = '\0'; | |
| 882 | |
| 883 # ifdef PNG_iTXt_SUPPORTED | |
| 884 if (textp->compression > 0) | |
| 885 { | |
| 886 textp->text_length = 0; | |
| 887 textp->itxt_length = text_length; | |
| 888 } | |
| 889 | |
| 890 else | |
| 891 # endif | |
| 892 { | |
| 893 textp->text_length = text_length; | |
| 894 textp->itxt_length = 0; | |
| 895 } | |
| 896 | |
| 897 info_ptr->num_text++; | |
| 898 png_debug1(3, "transferred text chunk %d", info_ptr->num_text); | |
| 899 } | |
| 900 | |
| 901 return(0); | |
| 902 } | |
| 903 #endif | |
| 904 | |
| 905 #ifdef PNG_tIME_SUPPORTED | |
| 906 void PNGAPI | |
| 907 png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 908 png_const_timep mod_time) | |
| 909 { | |
| 910 png_debug1(1, "in %s storage function", "tIME"); | |
| 911 | |
| 912 if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL || | |
| 913 (png_ptr->mode & PNG_WROTE_tIME) != 0) | |
| 914 return; | |
| 915 | |
| 916 if (mod_time->month == 0 || mod_time->month > 12 || | |
| 917 mod_time->day == 0 || mod_time->day > 31 || | |
| 918 mod_time->hour > 23 || mod_time->minute > 59 || | |
| 919 mod_time->second > 60) | |
| 920 { | |
| 921 png_warning(png_ptr, "Ignoring invalid time value"); | |
| 922 | |
| 923 return; | |
| 924 } | |
| 925 | |
| 926 info_ptr->mod_time = *mod_time; | |
| 927 info_ptr->valid |= PNG_INFO_tIME; | |
| 928 } | |
| 929 #endif | |
| 930 | |
| 931 #ifdef PNG_tRNS_SUPPORTED | |
| 932 void PNGAPI | |
| 933 png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr, | |
| 934 png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color) | |
| 935 { | |
| 936 png_debug1(1, "in %s storage function", "tRNS"); | |
| 937 | |
| 938 if (png_ptr == NULL || info_ptr == NULL) | |
| 939 | |
| 940 return; | |
| 941 | |
| 942 if (trans_alpha != NULL) | |
| 943 { | |
| 944 /* It may not actually be necessary to set png_ptr->trans_alpha here; | |
| 945 * we do it for backward compatibility with the way the png_handle_tRNS | |
| 946 * function used to do the allocation. | |
| 947 * | |
| 948 * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively | |
| 949 * relies on png_set_tRNS storing the information in png_struct | |
| 950 * (otherwise it won't be there for the code in pngrtran.c). | |
| 951 */ | |
| 952 | |
| 953 png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0); | |
| 954 | |
| 955 /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */ | |
| 956 png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep, | |
| 957 png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH)); | |
| 958 | |
| 959 if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH) | |
| 960 memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans); | |
| 961 } | |
| 962 | |
| 963 if (trans_color != NULL) | |
| 964 { | |
| 965 #ifdef PNG_WARNINGS_SUPPORTED | |
| 966 if (info_ptr->bit_depth < 16) | |
| 967 { | |
| 968 int sample_max = (1 << info_ptr->bit_depth) - 1; | |
| 969 | |
| 970 if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY && | |
| 971 trans_color->gray > sample_max) || | |
| 972 (info_ptr->color_type == PNG_COLOR_TYPE_RGB && | |
| 973 (trans_color->red > sample_max || | |
| 974 trans_color->green > sample_max || | |
| 975 trans_color->blue > sample_max))) | |
| 976 png_warning(png_ptr, | |
| 977 "tRNS chunk has out-of-range samples for bit_depth"); | |
| 978 } | |
| 979 #endif | |
| 980 | |
| 981 info_ptr->trans_color = *trans_color; | |
| 982 | |
| 983 if (num_trans == 0) | |
| 984 num_trans = 1; | |
| 985 } | |
| 986 | |
| 987 info_ptr->num_trans = (png_uint_16)num_trans; | |
| 988 | |
| 989 if (num_trans != 0) | |
| 990 { | |
| 991 info_ptr->valid |= PNG_INFO_tRNS; | |
| 992 info_ptr->free_me |= PNG_FREE_TRNS; | |
| 993 } | |
| 994 } | |
| 995 #endif | |
| 996 | |
| 997 #ifdef PNG_sPLT_SUPPORTED | |
| 998 void PNGAPI | |
| 999 png_set_sPLT(png_const_structrp png_ptr, | |
| 1000 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries) | |
| 1001 /* | |
| 1002 * entries - array of png_sPLT_t structures | |
| 1003 * to be added to the list of palettes | |
| 1004 * in the info structure. | |
| 1005 * | |
| 1006 * nentries - number of palette structures to be | |
| 1007 * added. | |
| 1008 */ | |
| 1009 { | |
| 1010 png_sPLT_tp np; | |
| 1011 | |
| 1012 if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || entries == NULL) | |
| 1013 return; | |
| 1014 | |
| 1015 /* Use the internal realloc function, which checks for all the possible | |
| 1016 * overflows. Notice that the parameters are (int) and (size_t) | |
| 1017 */ | |
| 1018 np = png_voidcast(png_sPLT_tp,png_realloc_array(png_ptr, | |
| 1019 info_ptr->splt_palettes, info_ptr->splt_palettes_num, nentries, | |
| 1020 sizeof *np)); | |
| 1021 | |
| 1022 if (np == NULL) | |
| 1023 { | |
| 1024 /* Out of memory or too many chunks */ | |
| 1025 png_chunk_report(png_ptr, "too many sPLT chunks", PNG_CHUNK_WRITE_ERROR); | |
| 1026 | |
| 1027 return; | |
| 1028 } | |
| 1029 | |
| 1030 png_free(png_ptr, info_ptr->splt_palettes); | |
| 1031 info_ptr->splt_palettes = np; | |
| 1032 info_ptr->free_me |= PNG_FREE_SPLT; | |
| 1033 | |
| 1034 np += info_ptr->splt_palettes_num; | |
| 1035 | |
| 1036 do | |
| 1037 { | |
| 1038 png_size_t length; | |
| 1039 | |
| 1040 /* Skip invalid input entries */ | |
| 1041 if (entries->name == NULL || entries->entries == NULL) | |
| 1042 { | |
| 1043 /* png_handle_sPLT doesn't do this, so this is an app error */ | |
| 1044 png_app_error(png_ptr, "png_set_sPLT: invalid sPLT"); | |
| 1045 /* Just skip the invalid entry */ | |
| 1046 continue; | |
| 1047 } | |
| 1048 | |
| 1049 np->depth = entries->depth; | |
| 1050 | |
| 1051 /* In the event of out-of-memory just return - there's no point keeping | |
| 1052 * on trying to add sPLT chunks. | |
| 1053 */ | |
| 1054 length = strlen(entries->name) + 1; | |
| 1055 np->name = png_voidcast(png_charp, png_malloc_base(png_ptr, length)); | |
| 1056 | |
| 1057 if (np->name == NULL) | |
| 1058 break; | |
| 1059 | |
| 1060 memcpy(np->name, entries->name, length); | |
| 1061 | |
| 1062 /* IMPORTANT: we have memory now that won't get freed if something else | |
| 1063 * goes wrong; this code must free it. png_malloc_array produces no | |
| 1064 * warnings; use a png_chunk_report (below) if there is an error. | |
| 1065 */ | |
| 1066 np->entries = png_voidcast(png_sPLT_entryp, png_malloc_array(png_ptr, | |
| 1067 entries->nentries, sizeof (png_sPLT_entry))); | |
| 1068 | |
| 1069 if (np->entries == NULL) | |
| 1070 { | |
| 1071 png_free(png_ptr, np->name); | |
| 1072 np->name = NULL; | |
| 1073 break; | |
| 1074 } | |
| 1075 | |
| 1076 np->nentries = entries->nentries; | |
| 1077 /* This multiply can't overflow because png_malloc_array has already | |
| 1078 * checked it when doing the allocation. | |
| 1079 */ | |
| 1080 memcpy(np->entries, entries->entries, | |
| 1081 entries->nentries * sizeof (png_sPLT_entry)); | |
| 1082 | |
| 1083 /* Note that 'continue' skips the advance of the out pointer and out | |
| 1084 * count, so an invalid entry is not added. | |
| 1085 */ | |
| 1086 info_ptr->valid |= PNG_INFO_sPLT; | |
| 1087 ++(info_ptr->splt_palettes_num); | |
| 1088 ++np; | |
| 1089 } | |
| 1090 while (++entries, --nentries); | |
| 1091 | |
| 1092 if (nentries > 0) | |
| 1093 png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR); | |
| 1094 } | |
| 1095 #endif /* sPLT */ | |
| 1096 | |
| 1097 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED | |
| 1098 static png_byte | |
| 1099 check_location(png_const_structrp png_ptr, int location) | |
| 1100 { | |
| 1101 location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT); | |
| 1102 | |
| 1103 /* New in 1.6.0; copy the location and check it. This is an API | |
| 1104 * change; previously the app had to use the | |
| 1105 * png_set_unknown_chunk_location API below for each chunk. | |
| 1106 */ | |
| 1107 if (location == 0 && (png_ptr->mode & PNG_IS_READ_STRUCT) == 0) | |
| 1108 { | |
| 1109 /* Write struct, so unknown chunks come from the app */ | |
| 1110 png_app_warning(png_ptr, | |
| 1111 "png_set_unknown_chunks now expects a valid location"); | |
| 1112 /* Use the old behavior */ | |
| 1113 location = (png_byte)(png_ptr->mode & | |
| 1114 (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)); | |
| 1115 } | |
| 1116 | |
| 1117 /* This need not be an internal error - if the app calls | |
| 1118 * png_set_unknown_chunks on a read pointer it must get the location right. | |
| 1119 */ | |
| 1120 if (location == 0) | |
| 1121 png_error(png_ptr, "invalid location in png_set_unknown_chunks"); | |
| 1122 | |
| 1123 /* Now reduce the location to the top-most set bit by removing each least | |
| 1124 * significant bit in turn. | |
| 1125 */ | |
| 1126 while (location != (location & -location)) | |
| 1127 location &= ~(location & -location); | |
| 1128 | |
| 1129 /* The cast is safe because 'location' is a bit mask and only the low four | |
| 1130 * bits are significant. | |
| 1131 */ | |
| 1132 return (png_byte)location; | |
| 1133 } | |
| 1134 | |
| 1135 void PNGAPI | |
| 1136 png_set_unknown_chunks(png_const_structrp png_ptr, | |
| 1137 png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns) | |
| 1138 { | |
| 1139 png_unknown_chunkp np; | |
| 1140 | |
| 1141 if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0 || | |
| 1142 unknowns == NULL) | |
| 1143 return; | |
| 1144 | |
| 1145 /* Check for the failure cases where support has been disabled at compile | |
| 1146 * time. This code is hardly ever compiled - it's here because | |
| 1147 * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this | |
| 1148 * code) but may be meaningless if the read or write handling of unknown | |
| 1149 * chunks is not compiled in. | |
| 1150 */ | |
| 1151 # if !defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \ | |
| 1152 defined(PNG_READ_SUPPORTED) | |
| 1153 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0) | |
| 1154 { | |
| 1155 png_app_error(png_ptr, "no unknown chunk support on read"); | |
| 1156 | |
| 1157 return; | |
| 1158 } | |
| 1159 # endif | |
| 1160 # if !defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \ | |
| 1161 defined(PNG_WRITE_SUPPORTED) | |
| 1162 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0) | |
| 1163 { | |
| 1164 png_app_error(png_ptr, "no unknown chunk support on write"); | |
| 1165 | |
| 1166 return; | |
| 1167 } | |
| 1168 # endif | |
| 1169 | |
| 1170 /* Prior to 1.6.0 this code used png_malloc_warn; however, this meant that | |
| 1171 * unknown critical chunks could be lost with just a warning resulting in | |
| 1172 * undefined behavior. Now png_chunk_report is used to provide behavior | |
| 1173 * appropriate to read or write. | |
| 1174 */ | |
| 1175 np = png_voidcast(png_unknown_chunkp, png_realloc_array(png_ptr, | |
| 1176 info_ptr->unknown_chunks, info_ptr->unknown_chunks_num, num_unknowns, | |
| 1177 sizeof *np)); | |
| 1178 | |
| 1179 if (np == NULL) | |
| 1180 { | |
| 1181 png_chunk_report(png_ptr, "too many unknown chunks", | |
| 1182 PNG_CHUNK_WRITE_ERROR); | |
| 1183 | |
| 1184 return; | |
| 1185 } | |
| 1186 | |
| 1187 png_free(png_ptr, info_ptr->unknown_chunks); | |
| 1188 info_ptr->unknown_chunks = np; /* safe because it is initialized */ | |
| 1189 info_ptr->free_me |= PNG_FREE_UNKN; | |
| 1190 | |
| 1191 np += info_ptr->unknown_chunks_num; | |
| 1192 | |
| 1193 /* Increment unknown_chunks_num each time round the loop to protect the | |
| 1194 * just-allocated chunk data. | |
| 1195 */ | |
| 1196 for (; num_unknowns > 0; --num_unknowns, ++unknowns) | |
| 1197 { | |
| 1198 memcpy(np->name, unknowns->name, (sizeof np->name)); | |
| 1199 np->name[(sizeof np->name)-1] = '\0'; | |
| 1200 np->location = check_location(png_ptr, unknowns->location); | |
| 1201 | |
| 1202 if (unknowns->size == 0) | |
| 1203 { | |
| 1204 np->data = NULL; | |
| 1205 np->size = 0; | |
| 1206 } | |
| 1207 | |
| 1208 else | |
| 1209 { | |
| 1210 np->data = png_voidcast(png_bytep, | |
| 1211 png_malloc_base(png_ptr, unknowns->size)); | |
| 1212 | |
| 1213 if (np->data == NULL) | |
| 1214 { | |
| 1215 png_chunk_report(png_ptr, "unknown chunk: out of memory", | |
| 1216 PNG_CHUNK_WRITE_ERROR); | |
| 1217 /* But just skip storing the unknown chunk */ | |
| 1218 continue; | |
| 1219 } | |
| 1220 | |
| 1221 memcpy(np->data, unknowns->data, unknowns->size); | |
| 1222 np->size = unknowns->size; | |
| 1223 } | |
| 1224 | |
| 1225 /* These increments are skipped on out-of-memory for the data - the | |
| 1226 * unknown chunk entry gets overwritten if the png_chunk_report returns. | |
| 1227 * This is correct in the read case (the chunk is just dropped.) | |
| 1228 */ | |
| 1229 ++np; | |
| 1230 ++(info_ptr->unknown_chunks_num); | |
| 1231 } | |
| 1232 } | |
| 1233 | |
| 1234 void PNGAPI | |
| 1235 png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 1236 int chunk, int location) | |
| 1237 { | |
| 1238 /* This API is pretty pointless in 1.6.0 because the location can be set | |
| 1239 * before the call to png_set_unknown_chunks. | |
| 1240 * | |
| 1241 * TODO: add a png_app_warning in 1.7 | |
| 1242 */ | |
| 1243 if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && | |
| 1244 chunk < info_ptr->unknown_chunks_num) | |
| 1245 { | |
| 1246 if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0) | |
| 1247 { | |
| 1248 png_app_error(png_ptr, "invalid unknown chunk location"); | |
| 1249 /* Fake out the pre 1.6.0 behavior: */ | |
| 1250 if ((location & PNG_HAVE_IDAT) != 0) /* undocumented! */ | |
| 1251 location = PNG_AFTER_IDAT; | |
| 1252 | |
| 1253 else | |
| 1254 location = PNG_HAVE_IHDR; /* also undocumented */ | |
| 1255 } | |
| 1256 | |
| 1257 info_ptr->unknown_chunks[chunk].location = | |
| 1258 check_location(png_ptr, location); | |
| 1259 } | |
| 1260 } | |
| 1261 #endif /* STORE_UNKNOWN_CHUNKS */ | |
| 1262 | |
| 1263 #ifdef PNG_MNG_FEATURES_SUPPORTED | |
| 1264 png_uint_32 PNGAPI | |
| 1265 png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features) | |
| 1266 { | |
| 1267 png_debug(1, "in png_permit_mng_features"); | |
| 1268 | |
| 1269 if (png_ptr == NULL) | |
| 1270 return 0; | |
| 1271 | |
| 1272 png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES; | |
| 1273 | |
| 1274 return png_ptr->mng_features_permitted; | |
| 1275 } | |
| 1276 #endif | |
| 1277 | |
| 1278 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED | |
| 1279 static unsigned int | |
| 1280 add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep) | |
| 1281 { | |
| 1282 unsigned int i; | |
| 1283 | |
| 1284 /* Utility function: update the 'keep' state of a chunk if it is already in | |
| 1285 * the list, otherwise add it to the list. | |
| 1286 */ | |
| 1287 for (i=0; i<count; ++i, list += 5) | |
| 1288 { | |
| 1289 if (memcmp(list, add, 4) == 0) | |
| 1290 { | |
| 1291 list[4] = (png_byte)keep; | |
| 1292 | |
| 1293 return count; | |
| 1294 } | |
| 1295 } | |
| 1296 | |
| 1297 if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT) | |
| 1298 { | |
| 1299 ++count; | |
| 1300 memcpy(list, add, 4); | |
| 1301 list[4] = (png_byte)keep; | |
| 1302 } | |
| 1303 | |
| 1304 return count; | |
| 1305 } | |
| 1306 | |
| 1307 void PNGAPI | |
| 1308 png_set_keep_unknown_chunks(png_structrp png_ptr, int keep, | |
| 1309 png_const_bytep chunk_list, int num_chunks_in) | |
| 1310 { | |
| 1311 png_bytep new_list; | |
| 1312 unsigned int num_chunks, old_num_chunks; | |
| 1313 | |
| 1314 if (png_ptr == NULL) | |
| 1315 return; | |
| 1316 | |
| 1317 if (keep < 0 || keep >= PNG_HANDLE_CHUNK_LAST) | |
| 1318 { | |
| 1319 png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep"); | |
| 1320 | |
| 1321 return; | |
| 1322 } | |
| 1323 | |
| 1324 if (num_chunks_in <= 0) | |
| 1325 { | |
| 1326 png_ptr->unknown_default = keep; | |
| 1327 | |
| 1328 /* '0' means just set the flags, so stop here */ | |
| 1329 if (num_chunks_in == 0) | |
| 1330 return; | |
| 1331 } | |
| 1332 | |
| 1333 if (num_chunks_in < 0) | |
| 1334 { | |
| 1335 /* Ignore all unknown chunks and all chunks recognized by | |
| 1336 * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND | |
| 1337 */ | |
| 1338 static PNG_CONST png_byte chunks_to_ignore[] = { | |
| 1339 98, 75, 71, 68, '\0', /* bKGD */ | |
| 1340 99, 72, 82, 77, '\0', /* cHRM */ | |
| 1341 103, 65, 77, 65, '\0', /* gAMA */ | |
| 1342 104, 73, 83, 84, '\0', /* hIST */ | |
| 1343 105, 67, 67, 80, '\0', /* iCCP */ | |
| 1344 105, 84, 88, 116, '\0', /* iTXt */ | |
| 1345 111, 70, 70, 115, '\0', /* oFFs */ | |
| 1346 112, 67, 65, 76, '\0', /* pCAL */ | |
| 1347 112, 72, 89, 115, '\0', /* pHYs */ | |
| 1348 115, 66, 73, 84, '\0', /* sBIT */ | |
| 1349 115, 67, 65, 76, '\0', /* sCAL */ | |
| 1350 115, 80, 76, 84, '\0', /* sPLT */ | |
| 1351 115, 84, 69, 82, '\0', /* sTER */ | |
| 1352 115, 82, 71, 66, '\0', /* sRGB */ | |
| 1353 116, 69, 88, 116, '\0', /* tEXt */ | |
| 1354 116, 73, 77, 69, '\0', /* tIME */ | |
| 1355 122, 84, 88, 116, '\0' /* zTXt */ | |
| 1356 }; | |
| 1357 | |
| 1358 chunk_list = chunks_to_ignore; | |
| 1359 num_chunks = (unsigned int)/*SAFE*/(sizeof chunks_to_ignore)/5U; | |
| 1360 } | |
| 1361 | |
| 1362 else /* num_chunks_in > 0 */ | |
| 1363 { | |
| 1364 if (chunk_list == NULL) | |
| 1365 { | |
| 1366 /* Prior to 1.6.0 this was silently ignored, now it is an app_error | |
| 1367 * which can be switched off. | |
| 1368 */ | |
| 1369 png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list"); | |
| 1370 | |
| 1371 return; | |
| 1372 } | |
| 1373 | |
| 1374 num_chunks = num_chunks_in; | |
| 1375 } | |
| 1376 | |
| 1377 old_num_chunks = png_ptr->num_chunk_list; | |
| 1378 if (png_ptr->chunk_list == NULL) | |
| 1379 old_num_chunks = 0; | |
| 1380 | |
| 1381 /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow. | |
| 1382 */ | |
| 1383 if (num_chunks + old_num_chunks > UINT_MAX/5) | |
| 1384 { | |
| 1385 png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks"); | |
| 1386 | |
| 1387 return; | |
| 1388 } | |
| 1389 | |
| 1390 /* If these chunks are being reset to the default then no more memory is | |
| 1391 * required because add_one_chunk above doesn't extend the list if the 'keep' | |
| 1392 * parameter is the default. | |
| 1393 */ | |
| 1394 if (keep != 0) | |
| 1395 { | |
| 1396 new_list = png_voidcast(png_bytep, png_malloc(png_ptr, | |
| 1397 5 * (num_chunks + old_num_chunks))); | |
| 1398 | |
| 1399 if (old_num_chunks > 0) | |
| 1400 memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks); | |
| 1401 } | |
| 1402 | |
| 1403 else if (old_num_chunks > 0) | |
| 1404 new_list = png_ptr->chunk_list; | |
| 1405 | |
| 1406 else | |
| 1407 new_list = NULL; | |
| 1408 | |
| 1409 /* Add the new chunks together with each one's handling code. If the chunk | |
| 1410 * already exists the code is updated, otherwise the chunk is added to the | |
| 1411 * end. (In libpng 1.6.0 order no longer matters because this code enforces | |
| 1412 * the earlier convention that the last setting is the one that is used.) | |
| 1413 */ | |
| 1414 if (new_list != NULL) | |
| 1415 { | |
| 1416 png_const_bytep inlist; | |
| 1417 png_bytep outlist; | |
| 1418 unsigned int i; | |
| 1419 | |
| 1420 for (i=0; i<num_chunks; ++i) | |
| 1421 { | |
| 1422 old_num_chunks = add_one_chunk(new_list, old_num_chunks, | |
| 1423 chunk_list+5*i, keep); | |
| 1424 } | |
| 1425 | |
| 1426 /* Now remove any spurious 'default' entries. */ | |
| 1427 num_chunks = 0; | |
| 1428 for (i=0, inlist=outlist=new_list; i<old_num_chunks; ++i, inlist += 5) | |
| 1429 { | |
| 1430 if (inlist[4]) | |
| 1431 { | |
| 1432 if (outlist != inlist) | |
| 1433 memcpy(outlist, inlist, 5); | |
| 1434 outlist += 5; | |
| 1435 ++num_chunks; | |
| 1436 } | |
| 1437 } | |
| 1438 | |
| 1439 /* This means the application has removed all the specialized handling. */ | |
| 1440 if (num_chunks == 0) | |
| 1441 { | |
| 1442 if (png_ptr->chunk_list != new_list) | |
| 1443 png_free(png_ptr, new_list); | |
| 1444 | |
| 1445 new_list = NULL; | |
| 1446 } | |
| 1447 } | |
| 1448 | |
| 1449 else | |
| 1450 num_chunks = 0; | |
| 1451 | |
| 1452 png_ptr->num_chunk_list = num_chunks; | |
| 1453 | |
| 1454 if (png_ptr->chunk_list != new_list) | |
| 1455 { | |
| 1456 if (png_ptr->chunk_list != NULL) | |
| 1457 png_free(png_ptr, png_ptr->chunk_list); | |
| 1458 | |
| 1459 png_ptr->chunk_list = new_list; | |
| 1460 } | |
| 1461 } | |
| 1462 #endif | |
| 1463 | |
| 1464 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED | |
| 1465 void PNGAPI | |
| 1466 png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr, | |
| 1467 png_user_chunk_ptr read_user_chunk_fn) | |
| 1468 { | |
| 1469 png_debug(1, "in png_set_read_user_chunk_fn"); | |
| 1470 | |
| 1471 if (png_ptr == NULL) | |
| 1472 return; | |
| 1473 | |
| 1474 png_ptr->read_user_chunk_fn = read_user_chunk_fn; | |
| 1475 png_ptr->user_chunk_ptr = user_chunk_ptr; | |
| 1476 } | |
| 1477 #endif | |
| 1478 | |
| 1479 #ifdef PNG_INFO_IMAGE_SUPPORTED | |
| 1480 void PNGAPI | |
| 1481 png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr, | |
| 1482 png_bytepp row_pointers) | |
| 1483 { | |
| 1484 png_debug1(1, "in %s storage function", "rows"); | |
| 1485 | |
| 1486 if (png_ptr == NULL || info_ptr == NULL) | |
| 1487 return; | |
| 1488 | |
| 1489 if (info_ptr->row_pointers != NULL && | |
| 1490 (info_ptr->row_pointers != row_pointers)) | |
| 1491 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); | |
| 1492 | |
| 1493 info_ptr->row_pointers = row_pointers; | |
| 1494 | |
| 1495 if (row_pointers != NULL) | |
| 1496 info_ptr->valid |= PNG_INFO_IDAT; | |
| 1497 } | |
| 1498 #endif | |
| 1499 | |
| 1500 void PNGAPI | |
| 1501 png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size) | |
| 1502 { | |
| 1503 if (png_ptr == NULL) | |
| 1504 return; | |
| 1505 | |
| 1506 if (size == 0 || size > PNG_UINT_31_MAX) | |
| 1507 png_error(png_ptr, "invalid compression buffer size"); | |
| 1508 | |
| 1509 # ifdef PNG_SEQUENTIAL_READ_SUPPORTED | |
| 1510 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0) | |
| 1511 { | |
| 1512 png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */ | |
| 1513 return; | |
| 1514 } | |
| 1515 # endif | |
| 1516 | |
| 1517 # ifdef PNG_WRITE_SUPPORTED | |
| 1518 if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0) | |
| 1519 { | |
| 1520 if (png_ptr->zowner != 0) | |
| 1521 { | |
| 1522 png_warning(png_ptr, | |
| 1523 "Compression buffer size cannot be changed because it is in use"); | |
| 1524 | |
| 1525 return; | |
| 1526 } | |
| 1527 | |
| 1528 #ifndef __COVERITY__ | |
| 1529 /* Some compilers complain that this is always false. However, it | |
| 1530 * can be true when integer overflow happens. | |
| 1531 */ | |
| 1532 if (size > ZLIB_IO_MAX) | |
| 1533 { | |
| 1534 png_warning(png_ptr, | |
| 1535 "Compression buffer size limited to system maximum"); | |
| 1536 size = ZLIB_IO_MAX; /* must fit */ | |
| 1537 } | |
| 1538 #endif | |
| 1539 | |
| 1540 if (size < 6) | |
| 1541 { | |
| 1542 /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH | |
| 1543 * if this is permitted. | |
| 1544 */ | |
| 1545 png_warning(png_ptr, | |
| 1546 "Compression buffer size cannot be reduced below 6"); | |
| 1547 | |
| 1548 return; | |
| 1549 } | |
| 1550 | |
| 1551 if (png_ptr->zbuffer_size != size) | |
| 1552 { | |
| 1553 png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list); | |
| 1554 png_ptr->zbuffer_size = (uInt)size; | |
| 1555 } | |
| 1556 } | |
| 1557 # endif | |
| 1558 } | |
| 1559 | |
| 1560 void PNGAPI | |
| 1561 png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask) | |
| 1562 { | |
| 1563 if (png_ptr != NULL && info_ptr != NULL) | |
| 1564 info_ptr->valid &= ~mask; | |
| 1565 } | |
| 1566 | |
| 1567 | |
| 1568 #ifdef PNG_SET_USER_LIMITS_SUPPORTED | |
| 1569 /* This function was added to libpng 1.2.6 */ | |
| 1570 void PNGAPI | |
| 1571 png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max, | |
| 1572 png_uint_32 user_height_max) | |
| 1573 { | |
| 1574 /* Images with dimensions larger than these limits will be | |
| 1575 * rejected by png_set_IHDR(). To accept any PNG datastream | |
| 1576 * regardless of dimensions, set both limits to 0x7fffffff. | |
| 1577 */ | |
| 1578 if (png_ptr == NULL) | |
| 1579 return; | |
| 1580 | |
| 1581 png_ptr->user_width_max = user_width_max; | |
| 1582 png_ptr->user_height_max = user_height_max; | |
| 1583 } | |
| 1584 | |
| 1585 /* This function was added to libpng 1.4.0 */ | |
| 1586 void PNGAPI | |
| 1587 png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max) | |
| 1588 { | |
| 1589 if (png_ptr != NULL) | |
| 1590 png_ptr->user_chunk_cache_max = user_chunk_cache_max; | |
| 1591 } | |
| 1592 | |
| 1593 /* This function was added to libpng 1.4.1 */ | |
| 1594 void PNGAPI | |
| 1595 png_set_chunk_malloc_max (png_structrp png_ptr, | |
| 1596 png_alloc_size_t user_chunk_malloc_max) | |
| 1597 { | |
| 1598 if (png_ptr != NULL) | |
| 1599 png_ptr->user_chunk_malloc_max = user_chunk_malloc_max; | |
| 1600 } | |
| 1601 #endif /* ?SET_USER_LIMITS */ | |
| 1602 | |
| 1603 | |
| 1604 #ifdef PNG_BENIGN_ERRORS_SUPPORTED | |
| 1605 void PNGAPI | |
| 1606 png_set_benign_errors(png_structrp png_ptr, int allowed) | |
| 1607 { | |
| 1608 png_debug(1, "in png_set_benign_errors"); | |
| 1609 | |
| 1610 /* If allowed is 1, png_benign_error() is treated as a warning. | |
| 1611 * | |
| 1612 * If allowed is 0, png_benign_error() is treated as an error (which | |
| 1613 * is the default behavior if png_set_benign_errors() is not called). | |
| 1614 */ | |
| 1615 | |
| 1616 if (allowed != 0) | |
| 1617 png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN | | |
| 1618 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN; | |
| 1619 | |
| 1620 else | |
| 1621 png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN | | |
| 1622 PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN); | |
| 1623 } | |
| 1624 #endif /* BENIGN_ERRORS */ | |
| 1625 | |
| 1626 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED | |
| 1627 /* Whether to report invalid palette index; added at libng-1.5.10. | |
| 1628 * It is possible for an indexed (color-type==3) PNG file to contain | |
| 1629 * pixels with invalid (out-of-range) indexes if the PLTE chunk has | |
| 1630 * fewer entries than the image's bit-depth would allow. We recover | |
| 1631 * from this gracefully by filling any incomplete palette with zeros | |
| 1632 * (opaque black). By default, when this occurs libpng will issue | |
| 1633 * a benign error. This API can be used to override that behavior. | |
| 1634 */ | |
| 1635 void PNGAPI | |
| 1636 png_set_check_for_invalid_index(png_structrp png_ptr, int allowed) | |
| 1637 { | |
| 1638 png_debug(1, "in png_set_check_for_invalid_index"); | |
| 1639 | |
| 1640 if (allowed > 0) | |
| 1641 png_ptr->num_palette_max = 0; | |
| 1642 | |
| 1643 else | |
| 1644 png_ptr->num_palette_max = -1; | |
| 1645 } | |
| 1646 #endif | |
| 1647 #endif /* READ || WRITE */ | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1599513004:
XFA: Rename libpng to libpng16. (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@xfa