| 1 | |
| 2 | /* pngrutil.c - utilities to read a PNG file |
| 3 | * |
| 4 | * libpng 1.2.5rc3 - September 18, 2002 |
| 5 | * For conditions of distribution and use, see copyright notice in png.h |
| 6 | * Copyright (c) 1998-2002 Glenn Randers-Pehrson |
| 7 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 8 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| 9 | * |
| 10 | * This file contains routines that are only called from within |
| 11 | * libpng itself during the course of reading an image. |
| 12 | */ |
| 13 | |
| 14 | #define PNG_INTERNAL |
| 15 | #include "png.h" |
| 16 | |
| 17 | #if defined(_WIN32_WCE) |
| 18 | /* strtod() function is not supported on WindowsCE */ |
| 19 | # ifdef PNG_FLOATING_POINT_SUPPORTED |
| 20 | __inline double strtod(const char *nptr, char **endptr) |
| 21 | { |
| 22 | double result = 0; |
| 23 | int len; |
| 24 | wchar_t *str, *end; |
| 25 | |
| 26 | len = MultiByteToWideChar(CP_ACP, 0, nptr, -1, NULL, 0); |
| 27 | str = (wchar_t *)malloc(len * sizeof(wchar_t)); |
| 28 | if ( NULL != str ) |
| 29 | { |
| 30 | MultiByteToWideChar(CP_ACP, 0, nptr, -1, str, len); |
| 31 | result = wcstod(str, &end); |
| 32 | len = WideCharToMultiByte(CP_ACP, 0, end, -1, NULL, 0, NULL, NULL); |
| 33 | *endptr = (char *)nptr + (png_strlen(nptr) - len + 1); |
| 34 | free(str); |
| 35 | } |
| 36 | return result; |
| 37 | } |
| 38 | # endif |
| 39 | #endif |
| 40 | |
| 41 | #ifndef PNG_READ_BIG_ENDIAN_SUPPORTED |
| 42 | /* Grab an unsigned 32-bit integer from a buffer in big-endian format. */ |
| 43 | png_uint_32 /* PRIVATE */ |
| 44 | png_get_uint_32(png_bytep buf) |
| 45 | { |
| 46 | png_uint_32 i = ((png_uint_32)(*buf) << 24) + |
| 47 | ((png_uint_32)(*(buf + 1)) << 16) + |
| 48 | ((png_uint_32)(*(buf + 2)) << 8) + |
| 49 | (png_uint_32)(*(buf + 3)); |
| 50 | |
| 51 | return (i); |
| 52 | } |
| 53 | |
| 54 | #if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_READ_oFFs_SUPPORTED) |
| 55 | /* Grab a signed 32-bit integer from a buffer in big-endian format. The |
| 56 | * data is stored in the PNG file in two's complement format, and it is |
| 57 | * assumed that the machine format for signed integers is the same. */ |
| 58 | png_int_32 /* PRIVATE */ |
| 59 | png_get_int_32(png_bytep buf) |
| 60 | { |
| 61 | png_int_32 i = ((png_int_32)(*buf) << 24) + |
| 62 | ((png_int_32)(*(buf + 1)) << 16) + |
| 63 | ((png_int_32)(*(buf + 2)) << 8) + |
| 64 | (png_int_32)(*(buf + 3)); |
| 65 | |
| 66 | return (i); |
| 67 | } |
| 68 | #endif /* PNG_READ_pCAL_SUPPORTED */ |
| 69 | |
| 70 | /* Grab an unsigned 16-bit integer from a buffer in big-endian format. */ |
| 71 | png_uint_16 /* PRIVATE */ |
| 72 | png_get_uint_16(png_bytep buf) |
| 73 | { |
| 74 | png_uint_16 i = (png_uint_16)(((png_uint_16)(*buf) << 8) + |
| 75 | (png_uint_16)(*(buf + 1))); |
| 76 | |
| 77 | return (i); |
| 78 | } |
| 79 | #endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */ |
| 80 | |
| 81 | /* Read data, and (optionally) run it through the CRC. */ |
| 82 | void /* PRIVATE */ |
| 83 | png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length) |
| 84 | { |
| 85 | png_read_data(png_ptr, buf, length); |
| 86 | png_calculate_crc(png_ptr, buf, length); |
| 87 | } |
| 88 | |
| 89 | /* Optionally skip data and then check the CRC. Depending on whether we |
| 90 | are reading a ancillary or critical chunk, and how the program has set |
| 91 | things up, we may calculate the CRC on the data and print a message. |
| 92 | Returns '1' if there was a CRC error, '0' otherwise. */ |
| 93 | int /* PRIVATE */ |
| 94 | png_crc_finish(png_structp png_ptr, png_uint_32 skip) |
| 95 | { |
| 96 | png_size_t i; |
| 97 | png_size_t istop = png_ptr->zbuf_size; |
| 98 | |
| 99 | for (i = (png_size_t)skip; i > istop; i -= istop) |
| 100 | { |
| 101 | png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); |
| 102 | } |
| 103 | if (i) |
| 104 | { |
| 105 | png_crc_read(png_ptr, png_ptr->zbuf, i); |
| 106 | } |
| 107 | |
| 108 | if (png_crc_error(png_ptr)) |
| 109 | { |
| 110 | if (((png_ptr->chunk_name[0] & 0x20) && /* Ancillary */ |
| 111 | !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) || |
| 112 | (!(png_ptr->chunk_name[0] & 0x20) && /* Critical */ |
| 113 | (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE))) |
| 114 | { |
| 115 | png_chunk_warning(png_ptr, "CRC error"); |
| 116 | } |
| 117 | else |
| 118 | { |
| 119 | png_chunk_error(png_ptr, "CRC error"); |
| 120 | } |
| 121 | return (1); |
| 122 | } |
| 123 | |
| 124 | return (0); |
| 125 | } |
| 126 | |
| 127 | /* Compare the CRC stored in the PNG file with that calculated by libpng from |
| 128 | the data it has read thus far. */ |
| 129 | int /* PRIVATE */ |
| 130 | png_crc_error(png_structp png_ptr) |
| 131 | { |
| 132 | png_byte crc_bytes[4]; |
| 133 | png_uint_32 crc; |
| 134 | int need_crc = 1; |
| 135 | |
| 136 | if (png_ptr->chunk_name[0] & 0x20) /* ancillary */ |
| 137 | { |
| 138 | if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) == |
| 139 | (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN)) |
| 140 | need_crc = 0; |
| 141 | } |
| 142 | else /* critical */ |
| 143 | { |
| 144 | if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) |
| 145 | need_crc = 0; |
| 146 | } |
| 147 | |
| 148 | png_read_data(png_ptr, crc_bytes, 4); |
| 149 | |
| 150 | if (need_crc) |
| 151 | { |
| 152 | crc = png_get_uint_32(crc_bytes); |
| 153 | return ((int)(crc != png_ptr->crc)); |
| 154 | } |
| 155 | else |
| 156 | return (0); |
| 157 | } |
| 158 | |
| 159 | #if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) || \ |
| 160 | defined(PNG_READ_iCCP_SUPPORTED) |
| 161 | /* |
| 162 | * Decompress trailing data in a chunk. The assumption is that chunkdata |
| 163 | * points at an allocated area holding the contents of a chunk with a |
| 164 | * trailing compressed part. What we get back is an allocated area |
| 165 | * holding the original prefix part and an uncompressed version of the |
| 166 | * trailing part (the malloc area passed in is freed). |
| 167 | */ |
| 168 | png_charp /* PRIVATE */ |
| 169 | png_decompress_chunk(png_structp png_ptr, int comp_type, |
| 170 | png_charp chunkdata, png_size_t chunklength, |
| 171 | png_size_t prefix_size, png_size_t *newlength) |
| 172 | { |
| 173 | static char msg[] = "Error decoding compressed text"; |
| 174 | png_charp text = NULL; |
| 175 | png_size_t text_size; |
| 176 | |
| 177 | if (comp_type == PNG_COMPRESSION_TYPE_BASE) |
| 178 | { |
| 179 | int ret = Z_OK; |
| 180 | png_ptr->zstream.next_in = (png_bytep)(chunkdata + prefix_size); |
| 181 | png_ptr->zstream.avail_in = (uInt)(chunklength - prefix_size); |
| 182 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 183 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 184 | |
| 185 | text_size = 0; |
| 186 | text = NULL; |
| 187 | |
| 188 | while (png_ptr->zstream.avail_in) |
| 189 | { |
| 190 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
| 191 | if (ret != Z_OK && ret != Z_STREAM_END) |
| 192 | { |
| 193 | if (png_ptr->zstream.msg != NULL) |
| 194 | png_warning(png_ptr, png_ptr->zstream.msg); |
| 195 | else |
| 196 | png_warning(png_ptr, msg); |
| 197 | inflateReset(&png_ptr->zstream); |
| 198 | png_ptr->zstream.avail_in = 0; |
| 199 | |
| 200 | if (text == NULL) |
| 201 | { |
| 202 | text_size = prefix_size + sizeof(msg) + 1; |
| 203 | text = (png_charp)png_malloc_warn(png_ptr, text_size); |
| 204 | if (text == NULL) |
| 205 | { |
| 206 | png_free(png_ptr,chunkdata); |
| 207 | png_error(png_ptr,"Not enough memory to decompress chunk"); |
| 208 | } |
| 209 | png_memcpy(text, chunkdata, prefix_size); |
| 210 | } |
| 211 | |
| 212 | text[text_size - 1] = 0x00; |
| 213 | |
| 214 | /* Copy what we can of the error message into the text chunk */ |
| 215 | text_size = (png_size_t)(chunklength - (text - chunkdata) - 1); |
| 216 | text_size = sizeof(msg) > text_size ? text_size : sizeof(msg); |
| 217 | png_memcpy(text + prefix_size, msg, text_size + 1); |
| 218 | break; |
| 219 | } |
| 220 | if (!png_ptr->zstream.avail_out || ret == Z_STREAM_END) |
| 221 | { |
| 222 | if (text == NULL) |
| 223 | { |
| 224 | text_size = prefix_size + |
| 225 | png_ptr->zbuf_size - png_ptr->zstream.avail_out; |
| 226 | text = (png_charp)png_malloc_warn(png_ptr, text_size + 1); |
| 227 | if (text == NULL) |
| 228 | { |
| 229 | png_free(png_ptr,chunkdata); |
| 230 | png_error(png_ptr,"Not enough memory to decompress chunk."); |
| 231 | } |
| 232 | png_memcpy(text + prefix_size, png_ptr->zbuf, |
| 233 | text_size - prefix_size); |
| 234 | png_memcpy(text, chunkdata, prefix_size); |
| 235 | *(text + text_size) = 0x00; |
| 236 | } |
| 237 | else |
| 238 | { |
| 239 | png_charp tmp; |
| 240 | |
| 241 | tmp = text; |
| 242 | text = (png_charp)png_malloc_warn(png_ptr, |
| 243 | (png_uint_32)(text_size + |
| 244 | png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1)); |
| 245 | if (text == NULL) |
| 246 | { |
| 247 | png_free(png_ptr, tmp); |
| 248 | png_free(png_ptr, chunkdata); |
| 249 | png_error(png_ptr,"Not enough memory to decompress chunk.."); |
| 250 | } |
| 251 | png_memcpy(text, tmp, text_size); |
| 252 | png_free(png_ptr, tmp); |
| 253 | png_memcpy(text + text_size, png_ptr->zbuf, |
| 254 | (png_ptr->zbuf_size - png_ptr->zstream.avail_out)); |
| 255 | text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out; |
| 256 | *(text + text_size) = 0x00; |
| 257 | } |
| 258 | if (ret == Z_STREAM_END) |
| 259 | break; |
| 260 | else |
| 261 | { |
| 262 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 263 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 264 | } |
| 265 | } |
| 266 | } |
| 267 | if (ret != Z_STREAM_END) |
| 268 | { |
| 269 | #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) |
| 270 | char umsg[50]; |
| 271 | |
| 272 | if (ret == Z_BUF_ERROR) |
| 273 | sprintf(umsg,"Buffer error in compressed datastream in %s chunk", |
| 274 | png_ptr->chunk_name); |
| 275 | else if (ret == Z_DATA_ERROR) |
| 276 | sprintf(umsg,"Data error in compressed datastream in %s chunk", |
| 277 | png_ptr->chunk_name); |
| 278 | else |
| 279 | sprintf(umsg,"Incomplete compressed datastream in %s chunk", |
| 280 | png_ptr->chunk_name); |
| 281 | png_warning(png_ptr, umsg); |
| 282 | #else |
| 283 | png_warning(png_ptr, |
| 284 | "Incomplete compressed datastream in chunk other than IDAT"); |
| 285 | #endif |
| 286 | text_size=prefix_size; |
| 287 | if (text == NULL) |
| 288 | { |
| 289 | text = (png_charp)png_malloc_warn(png_ptr, text_size+1); |
| 290 | if (text == NULL) |
| 291 | { |
| 292 | png_free(png_ptr, chunkdata); |
| 293 | png_error(png_ptr,"Not enough memory for text."); |
| 294 | } |
| 295 | png_memcpy(text, chunkdata, prefix_size); |
| 296 | } |
| 297 | *(text + text_size) = 0x00; |
| 298 | } |
| 299 | |
| 300 | inflateReset(&png_ptr->zstream); |
| 301 | png_ptr->zstream.avail_in = 0; |
| 302 | |
| 303 | png_free(png_ptr, chunkdata); |
| 304 | chunkdata = text; |
| 305 | *newlength=text_size; |
| 306 | } |
| 307 | else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */ |
| 308 | { |
| 309 | #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) |
| 310 | char umsg[50]; |
| 311 | |
| 312 | sprintf(umsg, "Unknown zTXt compression type %d", comp_type); |
| 313 | png_warning(png_ptr, umsg); |
| 314 | #else |
| 315 | png_warning(png_ptr, "Unknown zTXt compression type"); |
| 316 | #endif |
| 317 | |
| 318 | *(chunkdata + prefix_size) = 0x00; |
| 319 | *newlength=prefix_size; |
| 320 | } |
| 321 | |
| 322 | return chunkdata; |
| 323 | } |
| 324 | #endif |
| 325 | |
| 326 | /* read and check the IDHR chunk */ |
| 327 | void /* PRIVATE */ |
| 328 | png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 329 | { |
| 330 | png_byte buf[13]; |
| 331 | png_uint_32 width, height; |
| 332 | int bit_depth, color_type, compression_type, filter_type; |
| 333 | int interlace_type; |
| 334 | |
| 335 | png_debug(1, "in png_handle_IHDR\n"); |
| 336 | |
| 337 | if (png_ptr->mode & PNG_HAVE_IHDR) |
| 338 | png_error(png_ptr, "Out of place IHDR"); |
| 339 | |
| 340 | /* check the length */ |
| 341 | if (length != 13) |
| 342 | png_error(png_ptr, "Invalid IHDR chunk"); |
| 343 | |
| 344 | png_ptr->mode |= PNG_HAVE_IHDR; |
| 345 | |
| 346 | png_crc_read(png_ptr, buf, 13); |
| 347 | png_crc_finish(png_ptr, 0); |
| 348 | |
| 349 | width = png_get_uint_32(buf); |
| 350 | height = png_get_uint_32(buf + 4); |
| 351 | bit_depth = buf[8]; |
| 352 | color_type = buf[9]; |
| 353 | compression_type = buf[10]; |
| 354 | filter_type = buf[11]; |
| 355 | interlace_type = buf[12]; |
| 356 | |
| 357 | |
| 358 | /* set internal variables */ |
| 359 | png_ptr->width = width; |
| 360 | png_ptr->height = height; |
| 361 | png_ptr->bit_depth = (png_byte)bit_depth; |
| 362 | png_ptr->interlaced = (png_byte)interlace_type; |
| 363 | png_ptr->color_type = (png_byte)color_type; |
| 364 | #if defined(PNG_MNG_FEATURES_SUPPORTED) |
| 365 | png_ptr->filter_type = (png_byte)filter_type; |
| 366 | #endif |
| 367 | |
| 368 | /* find number of channels */ |
| 369 | switch (png_ptr->color_type) |
| 370 | { |
| 371 | case PNG_COLOR_TYPE_GRAY: |
| 372 | case PNG_COLOR_TYPE_PALETTE: |
| 373 | png_ptr->channels = 1; |
| 374 | break; |
| 375 | case PNG_COLOR_TYPE_RGB: |
| 376 | png_ptr->channels = 3; |
| 377 | break; |
| 378 | case PNG_COLOR_TYPE_GRAY_ALPHA: |
| 379 | png_ptr->channels = 2; |
| 380 | break; |
| 381 | case PNG_COLOR_TYPE_RGB_ALPHA: |
| 382 | png_ptr->channels = 4; |
| 383 | break; |
| 384 | } |
| 385 | |
| 386 | /* set up other useful info */ |
| 387 | png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth * |
| 388 | png_ptr->channels); |
| 389 | png_ptr->rowbytes = ((png_ptr->width * |
| 390 | (png_uint_32)png_ptr->pixel_depth + 7) >> 3); |
| 391 | png_debug1(3,"bit_depth = %d\n", png_ptr->bit_depth); |
| 392 | png_debug1(3,"channels = %d\n", png_ptr->channels); |
| 393 | png_debug1(3,"rowbytes = %lu\n", png_ptr->rowbytes); |
| 394 | png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth, |
| 395 | color_type, interlace_type, compression_type, filter_type); |
| 396 | } |
| 397 | |
| 398 | /* read and check the palette */ |
| 399 | void /* PRIVATE */ |
| 400 | png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 401 | { |
| 402 | png_color palette[PNG_MAX_PALETTE_LENGTH]; |
| 403 | int num, i; |
| 404 | #ifndef PNG_NO_POINTER_INDEXING |
| 405 | png_colorp pal_ptr; |
| 406 | #endif |
| 407 | |
| 408 | png_debug(1, "in png_handle_PLTE\n"); |
| 409 | |
| 410 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 411 | png_error(png_ptr, "Missing IHDR before PLTE"); |
| 412 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 413 | { |
| 414 | png_warning(png_ptr, "Invalid PLTE after IDAT"); |
| 415 | png_crc_finish(png_ptr, length); |
| 416 | return; |
| 417 | } |
| 418 | else if (png_ptr->mode & PNG_HAVE_PLTE) |
| 419 | png_error(png_ptr, "Duplicate PLTE chunk"); |
| 420 | |
| 421 | png_ptr->mode |= PNG_HAVE_PLTE; |
| 422 | |
| 423 | if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR)) |
| 424 | { |
| 425 | png_warning(png_ptr, |
| 426 | "Ignoring PLTE chunk in grayscale PNG"); |
| 427 | png_crc_finish(png_ptr, length); |
| 428 | return; |
| 429 | } |
| 430 | #if !defined(PNG_READ_OPT_PLTE_SUPPORTED) |
| 431 | if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE) |
| 432 | { |
| 433 | png_crc_finish(png_ptr, length); |
| 434 | return; |
| 435 | } |
| 436 | #endif |
| 437 | |
| 438 | if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3) |
| 439 | { |
| 440 | if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE) |
| 441 | { |
| 442 | png_warning(png_ptr, "Invalid palette chunk"); |
| 443 | png_crc_finish(png_ptr, length); |
| 444 | return; |
| 445 | } |
| 446 | else |
| 447 | { |
| 448 | png_error(png_ptr, "Invalid palette chunk"); |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | num = (int)length / 3; |
| 453 | |
| 454 | #ifndef PNG_NO_POINTER_INDEXING |
| 455 | for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++) |
| 456 | { |
| 457 | png_byte buf[3]; |
| 458 | |
| 459 | png_crc_read(png_ptr, buf, 3); |
| 460 | pal_ptr->red = buf[0]; |
| 461 | pal_ptr->green = buf[1]; |
| 462 | pal_ptr->blue = buf[2]; |
| 463 | } |
| 464 | #else |
| 465 | for (i = 0; i < num; i++) |
| 466 | { |
| 467 | png_byte buf[3]; |
| 468 | |
| 469 | png_crc_read(png_ptr, buf, 3); |
| 470 | /* don't depend upon png_color being any order */ |
| 471 | palette[i].red = buf[0]; |
| 472 | palette[i].green = buf[1]; |
| 473 | palette[i].blue = buf[2]; |
| 474 | } |
| 475 | #endif |
| 476 | |
| 477 | /* If we actually NEED the PLTE chunk (ie for a paletted image), we do |
| 478 | whatever the normal CRC configuration tells us. However, if we |
| 479 | have an RGB image, the PLTE can be considered ancillary, so |
| 480 | we will act as though it is. */ |
| 481 | #if !defined(PNG_READ_OPT_PLTE_SUPPORTED) |
| 482 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 483 | #endif |
| 484 | { |
| 485 | png_crc_finish(png_ptr, 0); |
| 486 | } |
| 487 | #if !defined(PNG_READ_OPT_PLTE_SUPPORTED) |
| 488 | else if (png_crc_error(png_ptr)) /* Only if we have a CRC error */ |
| 489 | { |
| 490 | /* If we don't want to use the data from an ancillary chunk, |
| 491 | we have two options: an error abort, or a warning and we |
| 492 | ignore the data in this chunk (which should be OK, since |
| 493 | it's considered ancillary for a RGB or RGBA image). */ |
| 494 | if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_USE)) |
| 495 | { |
| 496 | if (png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) |
| 497 | { |
| 498 | png_chunk_error(png_ptr, "CRC error"); |
| 499 | } |
| 500 | else |
| 501 | { |
| 502 | png_chunk_warning(png_ptr, "CRC error"); |
| 503 | return; |
| 504 | } |
| 505 | } |
| 506 | /* Otherwise, we (optionally) emit a warning and use the chunk. */ |
| 507 | else if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) |
| 508 | { |
| 509 | png_chunk_warning(png_ptr, "CRC error"); |
| 510 | } |
| 511 | } |
| 512 | #endif |
| 513 | |
| 514 | png_set_PLTE(png_ptr, info_ptr, palette, num); |
| 515 | |
| 516 | #if defined(PNG_READ_tRNS_SUPPORTED) |
| 517 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 518 | { |
| 519 | if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) |
| 520 | { |
| 521 | if (png_ptr->num_trans > (png_uint_16)num) |
| 522 | { |
| 523 | png_warning(png_ptr, "Truncating incorrect tRNS chunk length"); |
| 524 | png_ptr->num_trans = (png_uint_16)num; |
| 525 | } |
| 526 | if (info_ptr->num_trans > (png_uint_16)num) |
| 527 | { |
| 528 | png_warning(png_ptr, "Truncating incorrect info tRNS chunk length"); |
| 529 | info_ptr->num_trans = (png_uint_16)num; |
| 530 | } |
| 531 | } |
| 532 | } |
| 533 | #endif |
| 534 | |
| 535 | } |
| 536 | |
| 537 | void /* PRIVATE */ |
| 538 | png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 539 | { |
| 540 | png_debug(1, "in png_handle_IEND\n"); |
| 541 | |
| 542 | if (!(png_ptr->mode & PNG_HAVE_IHDR) || !(png_ptr->mode & PNG_HAVE_IDAT)) |
| 543 | { |
| 544 | png_error(png_ptr, "No image in file"); |
| 545 | |
| 546 | info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */ |
| 547 | } |
| 548 | |
| 549 | png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND); |
| 550 | |
| 551 | if (length != 0) |
| 552 | { |
| 553 | png_warning(png_ptr, "Incorrect IEND chunk length"); |
| 554 | } |
| 555 | png_crc_finish(png_ptr, length); |
| 556 | } |
| 557 | |
| 558 | #if defined(PNG_READ_gAMA_SUPPORTED) |
| 559 | void /* PRIVATE */ |
| 560 | png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 561 | { |
| 562 | png_fixed_point igamma; |
| 563 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 564 | float file_gamma; |
| 565 | #endif |
| 566 | png_byte buf[4]; |
| 567 | |
| 568 | png_debug(1, "in png_handle_gAMA\n"); |
| 569 | |
| 570 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 571 | png_error(png_ptr, "Missing IHDR before gAMA"); |
| 572 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 573 | { |
| 574 | png_warning(png_ptr, "Invalid gAMA after IDAT"); |
| 575 | png_crc_finish(png_ptr, length); |
| 576 | return; |
| 577 | } |
| 578 | else if (png_ptr->mode & PNG_HAVE_PLTE) |
| 579 | /* Should be an error, but we can cope with it */ |
| 580 | png_warning(png_ptr, "Out of place gAMA chunk"); |
| 581 | |
| 582 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) |
| 583 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 584 | && !(info_ptr->valid & PNG_INFO_sRGB) |
| 585 | #endif |
| 586 | ) |
| 587 | { |
| 588 | png_warning(png_ptr, "Duplicate gAMA chunk"); |
| 589 | png_crc_finish(png_ptr, length); |
| 590 | return; |
| 591 | } |
| 592 | |
| 593 | if (length != 4) |
| 594 | { |
| 595 | png_warning(png_ptr, "Incorrect gAMA chunk length"); |
| 596 | png_crc_finish(png_ptr, length); |
| 597 | return; |
| 598 | } |
| 599 | |
| 600 | png_crc_read(png_ptr, buf, 4); |
| 601 | if (png_crc_finish(png_ptr, 0)) |
| 602 | return; |
| 603 | |
| 604 | igamma = (png_fixed_point)png_get_uint_32(buf); |
| 605 | /* check for zero gamma */ |
| 606 | if (igamma == 0) |
| 607 | { |
| 608 | png_warning(png_ptr, |
| 609 | "Ignoring gAMA chunk with gamma=0"); |
| 610 | return; |
| 611 | } |
| 612 | |
| 613 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 614 | if (info_ptr->valid & PNG_INFO_sRGB) |
| 615 | if(igamma < 45000L || igamma > 46000L) |
| 616 | { |
| 617 | png_warning(png_ptr, |
| 618 | "Ignoring incorrect gAMA value when sRGB is also present"); |
| 619 | #ifndef PNG_NO_CONSOLE_IO |
| 620 | fprintf(stderr, "gamma = (%d/100000)\n", (int)igamma); |
| 621 | #endif |
| 622 | return; |
| 623 | } |
| 624 | #endif /* PNG_READ_sRGB_SUPPORTED */ |
| 625 | |
| 626 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 627 | file_gamma = (float)igamma / (float)100000.0; |
| 628 | # ifdef PNG_READ_GAMMA_SUPPORTED |
| 629 | png_ptr->gamma = file_gamma; |
| 630 | # endif |
| 631 | png_set_gAMA(png_ptr, info_ptr, file_gamma); |
| 632 | #endif |
| 633 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 634 | png_set_gAMA_fixed(png_ptr, info_ptr, igamma); |
| 635 | #endif |
| 636 | } |
| 637 | #endif |
| 638 | |
| 639 | #if defined(PNG_READ_sBIT_SUPPORTED) |
| 640 | void /* PRIVATE */ |
| 641 | png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 642 | { |
| 643 | png_size_t truelen; |
| 644 | png_byte buf[4]; |
| 645 | |
| 646 | png_debug(1, "in png_handle_sBIT\n"); |
| 647 | |
| 648 | buf[0] = buf[1] = buf[2] = buf[3] = 0; |
| 649 | |
| 650 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 651 | png_error(png_ptr, "Missing IHDR before sBIT"); |
| 652 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 653 | { |
| 654 | png_warning(png_ptr, "Invalid sBIT after IDAT"); |
| 655 | png_crc_finish(png_ptr, length); |
| 656 | return; |
| 657 | } |
| 658 | else if (png_ptr->mode & PNG_HAVE_PLTE) |
| 659 | { |
| 660 | /* Should be an error, but we can cope with it */ |
| 661 | png_warning(png_ptr, "Out of place sBIT chunk"); |
| 662 | } |
| 663 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)) |
| 664 | { |
| 665 | png_warning(png_ptr, "Duplicate sBIT chunk"); |
| 666 | png_crc_finish(png_ptr, length); |
| 667 | return; |
| 668 | } |
| 669 | |
| 670 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 671 | truelen = 3; |
| 672 | else |
| 673 | truelen = (png_size_t)png_ptr->channels; |
| 674 | |
| 675 | if (length != truelen) |
| 676 | { |
| 677 | png_warning(png_ptr, "Incorrect sBIT chunk length"); |
| 678 | png_crc_finish(png_ptr, length); |
| 679 | return; |
| 680 | } |
| 681 | |
| 682 | png_crc_read(png_ptr, buf, truelen); |
| 683 | if (png_crc_finish(png_ptr, 0)) |
| 684 | return; |
| 685 | |
| 686 | if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) |
| 687 | { |
| 688 | png_ptr->sig_bit.red = buf[0]; |
| 689 | png_ptr->sig_bit.green = buf[1]; |
| 690 | png_ptr->sig_bit.blue = buf[2]; |
| 691 | png_ptr->sig_bit.alpha = buf[3]; |
| 692 | } |
| 693 | else |
| 694 | { |
| 695 | png_ptr->sig_bit.gray = buf[0]; |
| 696 | png_ptr->sig_bit.red = buf[0]; |
| 697 | png_ptr->sig_bit.green = buf[0]; |
| 698 | png_ptr->sig_bit.blue = buf[0]; |
| 699 | png_ptr->sig_bit.alpha = buf[1]; |
| 700 | } |
| 701 | png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit)); |
| 702 | } |
| 703 | #endif |
| 704 | |
| 705 | #if defined(PNG_READ_cHRM_SUPPORTED) |
| 706 | void /* PRIVATE */ |
| 707 | png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 708 | { |
| 709 | png_byte buf[4]; |
| 710 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 711 | float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y; |
| 712 | #endif |
| 713 | png_fixed_point int_x_white, int_y_white, int_x_red, int_y_red, int_x_green, |
| 714 | int_y_green, int_x_blue, int_y_blue; |
| 715 | |
| 716 | png_uint_32 uint_x, uint_y; |
| 717 | |
| 718 | png_debug(1, "in png_handle_cHRM\n"); |
| 719 | |
| 720 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 721 | png_error(png_ptr, "Missing IHDR before cHRM"); |
| 722 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 723 | { |
| 724 | png_warning(png_ptr, "Invalid cHRM after IDAT"); |
| 725 | png_crc_finish(png_ptr, length); |
| 726 | return; |
| 727 | } |
| 728 | else if (png_ptr->mode & PNG_HAVE_PLTE) |
| 729 | /* Should be an error, but we can cope with it */ |
| 730 | png_warning(png_ptr, "Missing PLTE before cHRM"); |
| 731 | |
| 732 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM) |
| 733 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 734 | && !(info_ptr->valid & PNG_INFO_sRGB) |
| 735 | #endif |
| 736 | ) |
| 737 | { |
| 738 | png_warning(png_ptr, "Duplicate cHRM chunk"); |
| 739 | png_crc_finish(png_ptr, length); |
| 740 | return; |
| 741 | } |
| 742 | |
| 743 | if (length != 32) |
| 744 | { |
| 745 | png_warning(png_ptr, "Incorrect cHRM chunk length"); |
| 746 | png_crc_finish(png_ptr, length); |
| 747 | return; |
| 748 | } |
| 749 | |
| 750 | png_crc_read(png_ptr, buf, 4); |
| 751 | uint_x = png_get_uint_32(buf); |
| 752 | |
| 753 | png_crc_read(png_ptr, buf, 4); |
| 754 | uint_y = png_get_uint_32(buf); |
| 755 | |
| 756 | if (uint_x > 80000L || uint_y > 80000L || |
| 757 | uint_x + uint_y > 100000L) |
| 758 | { |
| 759 | png_warning(png_ptr, "Invalid cHRM white point"); |
| 760 | png_crc_finish(png_ptr, 24); |
| 761 | return; |
| 762 | } |
| 763 | int_x_white = (png_fixed_point)uint_x; |
| 764 | int_y_white = (png_fixed_point)uint_y; |
| 765 | |
| 766 | png_crc_read(png_ptr, buf, 4); |
| 767 | uint_x = png_get_uint_32(buf); |
| 768 | |
| 769 | png_crc_read(png_ptr, buf, 4); |
| 770 | uint_y = png_get_uint_32(buf); |
| 771 | |
| 772 | if (uint_x > 80000L || uint_y > 80000L || |
| 773 | uint_x + uint_y > 100000L) |
| 774 | { |
| 775 | png_warning(png_ptr, "Invalid cHRM red point"); |
| 776 | png_crc_finish(png_ptr, 16); |
| 777 | return; |
| 778 | } |
| 779 | int_x_red = (png_fixed_point)uint_x; |
| 780 | int_y_red = (png_fixed_point)uint_y; |
| 781 | |
| 782 | png_crc_read(png_ptr, buf, 4); |
| 783 | uint_x = png_get_uint_32(buf); |
| 784 | |
| 785 | png_crc_read(png_ptr, buf, 4); |
| 786 | uint_y = png_get_uint_32(buf); |
| 787 | |
| 788 | if (uint_x > 80000L || uint_y > 80000L || |
| 789 | uint_x + uint_y > 100000L) |
| 790 | { |
| 791 | png_warning(png_ptr, "Invalid cHRM green point"); |
| 792 | png_crc_finish(png_ptr, 8); |
| 793 | return; |
| 794 | } |
| 795 | int_x_green = (png_fixed_point)uint_x; |
| 796 | int_y_green = (png_fixed_point)uint_y; |
| 797 | |
| 798 | png_crc_read(png_ptr, buf, 4); |
| 799 | uint_x = png_get_uint_32(buf); |
| 800 | |
| 801 | png_crc_read(png_ptr, buf, 4); |
| 802 | uint_y = png_get_uint_32(buf); |
| 803 | |
| 804 | if (uint_x > 80000L || uint_y > 80000L || |
| 805 | uint_x + uint_y > 100000L) |
| 806 | { |
| 807 | png_warning(png_ptr, "Invalid cHRM blue point"); |
| 808 | png_crc_finish(png_ptr, 0); |
| 809 | return; |
| 810 | } |
| 811 | int_x_blue = (png_fixed_point)uint_x; |
| 812 | int_y_blue = (png_fixed_point)uint_y; |
| 813 | |
| 814 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 815 | white_x = (float)int_x_white / (float)100000.0; |
| 816 | white_y = (float)int_y_white / (float)100000.0; |
| 817 | red_x = (float)int_x_red / (float)100000.0; |
| 818 | red_y = (float)int_y_red / (float)100000.0; |
| 819 | green_x = (float)int_x_green / (float)100000.0; |
| 820 | green_y = (float)int_y_green / (float)100000.0; |
| 821 | blue_x = (float)int_x_blue / (float)100000.0; |
| 822 | blue_y = (float)int_y_blue / (float)100000.0; |
| 823 | #endif |
| 824 | |
| 825 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 826 | if (info_ptr->valid & PNG_INFO_sRGB) |
| 827 | { |
| 828 | if (abs(int_x_white - 31270L) > 1000 || |
| 829 | abs(int_y_white - 32900L) > 1000 || |
| 830 | abs(int_x_red - 64000L) > 1000 || |
| 831 | abs(int_y_red - 33000L) > 1000 || |
| 832 | abs(int_x_green - 30000L) > 1000 || |
| 833 | abs(int_y_green - 60000L) > 1000 || |
| 834 | abs(int_x_blue - 15000L) > 1000 || |
| 835 | abs(int_y_blue - 6000L) > 1000) |
| 836 | { |
| 837 | |
| 838 | png_warning(png_ptr, |
| 839 | "Ignoring incorrect cHRM value when sRGB is also present"); |
| 840 | #ifndef PNG_NO_CONSOLE_IO |
| 841 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 842 | fprintf(stderr,"wx=%f, wy=%f, rx=%f, ry=%f\n", |
| 843 | white_x, white_y, red_x, red_y); |
| 844 | fprintf(stderr,"gx=%f, gy=%f, bx=%f, by=%f\n", |
| 845 | green_x, green_y, blue_x, blue_y); |
| 846 | #else |
| 847 | fprintf(stderr,"wx=%ld, wy=%ld, rx=%ld, ry=%ld\n", |
| 848 | int_x_white, int_y_white, int_x_red, int_y_red); |
| 849 | fprintf(stderr,"gx=%ld, gy=%ld, bx=%ld, by=%ld\n", |
| 850 | int_x_green, int_y_green, int_x_blue, int_y_blue); |
| 851 | #endif |
| 852 | #endif /* PNG_NO_CONSOLE_IO */ |
| 853 | } |
| 854 | png_crc_finish(png_ptr, 0); |
| 855 | return; |
| 856 | } |
| 857 | #endif /* PNG_READ_sRGB_SUPPORTED */ |
| 858 | |
| 859 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 860 | png_set_cHRM(png_ptr, info_ptr, |
| 861 | white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y); |
| 862 | #endif |
| 863 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 864 | png_set_cHRM_fixed(png_ptr, info_ptr, |
| 865 | int_x_white, int_y_white, int_x_red, int_y_red, int_x_green, |
| 866 | int_y_green, int_x_blue, int_y_blue); |
| 867 | #endif |
| 868 | if (png_crc_finish(png_ptr, 0)) |
| 869 | return; |
| 870 | } |
| 871 | #endif |
| 872 | |
| 873 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 874 | void /* PRIVATE */ |
| 875 | png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 876 | { |
| 877 | int intent; |
| 878 | png_byte buf[1]; |
| 879 | |
| 880 | png_debug(1, "in png_handle_sRGB\n"); |
| 881 | |
| 882 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 883 | png_error(png_ptr, "Missing IHDR before sRGB"); |
| 884 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 885 | { |
| 886 | png_warning(png_ptr, "Invalid sRGB after IDAT"); |
| 887 | png_crc_finish(png_ptr, length); |
| 888 | return; |
| 889 | } |
| 890 | else if (png_ptr->mode & PNG_HAVE_PLTE) |
| 891 | /* Should be an error, but we can cope with it */ |
| 892 | png_warning(png_ptr, "Out of place sRGB chunk"); |
| 893 | |
| 894 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)) |
| 895 | { |
| 896 | png_warning(png_ptr, "Duplicate sRGB chunk"); |
| 897 | png_crc_finish(png_ptr, length); |
| 898 | return; |
| 899 | } |
| 900 | |
| 901 | if (length != 1) |
| 902 | { |
| 903 | png_warning(png_ptr, "Incorrect sRGB chunk length"); |
| 904 | png_crc_finish(png_ptr, length); |
| 905 | return; |
| 906 | } |
| 907 | |
| 908 | png_crc_read(png_ptr, buf, 1); |
| 909 | if (png_crc_finish(png_ptr, 0)) |
| 910 | return; |
| 911 | |
| 912 | intent = buf[0]; |
| 913 | /* check for bad intent */ |
| 914 | if (intent >= PNG_sRGB_INTENT_LAST) |
| 915 | { |
| 916 | png_warning(png_ptr, "Unknown sRGB intent"); |
| 917 | return; |
| 918 | } |
| 919 | |
| 920 | #if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED) |
| 921 | if ((info_ptr->valid & PNG_INFO_gAMA)) |
| 922 | { |
| 923 | int igamma; |
| 924 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 925 | igamma=(int)info_ptr->int_gamma; |
| 926 | #else |
| 927 | # ifdef PNG_FLOATING_POINT_SUPPORTED |
| 928 | igamma=(int)(info_ptr->gamma * 100000.); |
| 929 | # endif |
| 930 | #endif |
| 931 | if(igamma < 45000L || igamma > 46000L) |
| 932 | { |
| 933 | png_warning(png_ptr, |
| 934 | "Ignoring incorrect gAMA value when sRGB is also present"); |
| 935 | #ifndef PNG_NO_CONSOLE_IO |
| 936 | # ifdef PNG_FIXED_POINT_SUPPORTED |
| 937 | fprintf(stderr,"incorrect gamma=(%d/100000)\n",(int)png_ptr->int_gamma); |
| 938 | # else |
| 939 | # ifdef PNG_FLOATING_POINT_SUPPORTED |
| 940 | fprintf(stderr,"incorrect gamma=%f\n",png_ptr->gamma); |
| 941 | # endif |
| 942 | # endif |
| 943 | #endif |
| 944 | } |
| 945 | } |
| 946 | #endif /* PNG_READ_gAMA_SUPPORTED */ |
| 947 | |
| 948 | #ifdef PNG_READ_cHRM_SUPPORTED |
| 949 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 950 | if (info_ptr->valid & PNG_INFO_cHRM) |
| 951 | if (abs(info_ptr->int_x_white - 31270L) > 1000 || |
| 952 | abs(info_ptr->int_y_white - 32900L) > 1000 || |
| 953 | abs(info_ptr->int_x_red - 64000L) > 1000 || |
| 954 | abs(info_ptr->int_y_red - 33000L) > 1000 || |
| 955 | abs(info_ptr->int_x_green - 30000L) > 1000 || |
| 956 | abs(info_ptr->int_y_green - 60000L) > 1000 || |
| 957 | abs(info_ptr->int_x_blue - 15000L) > 1000 || |
| 958 | abs(info_ptr->int_y_blue - 6000L) > 1000) |
| 959 | { |
| 960 | png_warning(png_ptr, |
| 961 | "Ignoring incorrect cHRM value when sRGB is also present"); |
| 962 | } |
| 963 | #endif /* PNG_FIXED_POINT_SUPPORTED */ |
| 964 | #endif /* PNG_READ_cHRM_SUPPORTED */ |
| 965 | |
| 966 | png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, intent); |
| 967 | } |
| 968 | #endif /* PNG_READ_sRGB_SUPPORTED */ |
| 969 | |
| 970 | #if defined(PNG_READ_iCCP_SUPPORTED) |
| 971 | void /* PRIVATE */ |
| 972 | png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 973 | /* Note: this does not properly handle chunks that are > 64K under DOS */ |
| 974 | { |
| 975 | png_charp chunkdata; |
| 976 | png_byte compression_type; |
| 977 | png_bytep pC; |
| 978 | png_charp profile; |
| 979 | png_uint_32 skip = 0; |
| 980 | png_uint_32 profile_size = 0; |
| 981 | png_uint_32 profile_length = 0; |
| 982 | png_size_t slength, prefix_length, data_length; |
| 983 | |
| 984 | png_debug(1, "in png_handle_iCCP\n"); |
| 985 | |
| 986 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 987 | png_error(png_ptr, "Missing IHDR before iCCP"); |
| 988 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 989 | { |
| 990 | png_warning(png_ptr, "Invalid iCCP after IDAT"); |
| 991 | png_crc_finish(png_ptr, length); |
| 992 | return; |
| 993 | } |
| 994 | else if (png_ptr->mode & PNG_HAVE_PLTE) |
| 995 | /* Should be an error, but we can cope with it */ |
| 996 | png_warning(png_ptr, "Out of place iCCP chunk"); |
| 997 | |
| 998 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)) |
| 999 | { |
| 1000 | png_warning(png_ptr, "Duplicate iCCP chunk"); |
| 1001 | png_crc_finish(png_ptr, length); |
| 1002 | return; |
| 1003 | } |
| 1004 | |
| 1005 | #ifdef PNG_MAX_MALLOC_64K |
| 1006 | if (length > (png_uint_32)65535L) |
| 1007 | { |
| 1008 | png_warning(png_ptr, "iCCP chunk too large to fit in memory"); |
| 1009 | skip = length - (png_uint_32)65535L; |
| 1010 | length = (png_uint_32)65535L; |
| 1011 | } |
| 1012 | #endif |
| 1013 | |
| 1014 | chunkdata = (png_charp)png_malloc(png_ptr, length + 1); |
| 1015 | slength = (png_size_t)length; |
| 1016 | png_crc_read(png_ptr, (png_bytep)chunkdata, slength); |
| 1017 | |
| 1018 | if (png_crc_finish(png_ptr, skip)) |
| 1019 | { |
| 1020 | png_free(png_ptr, chunkdata); |
| 1021 | return; |
| 1022 | } |
| 1023 | |
| 1024 | chunkdata[slength] = 0x00; |
| 1025 | |
| 1026 | for (profile = chunkdata; *profile; profile++) |
| 1027 | /* empty loop to find end of name */ ; |
| 1028 | |
| 1029 | ++profile; |
| 1030 | |
| 1031 | /* there should be at least one zero (the compression type byte) |
| 1032 | following the separator, and we should be on it */ |
| 1033 | if ( profile >= chunkdata + slength) |
| 1034 | { |
| 1035 | png_free(png_ptr, chunkdata); |
| 1036 | png_warning(png_ptr, "Malformed iCCP chunk"); |
| 1037 | return; |
| 1038 | } |
| 1039 | |
| 1040 | /* compression_type should always be zero */ |
| 1041 | compression_type = *profile++; |
| 1042 | if (compression_type) |
| 1043 | { |
| 1044 | png_warning(png_ptr, "Ignoring nonzero compression type in iCCP chunk"); |
| 1045 | compression_type=0x00; /* Reset it to zero (libpng-1.0.6 through 1.0.8 |
| 1046 | wrote nonzero) */ |
| 1047 | } |
| 1048 | |
| 1049 | prefix_length = profile - chunkdata; |
| 1050 | chunkdata = png_decompress_chunk(png_ptr, compression_type, chunkdata, |
| 1051 | slength, prefix_length, &data_length); |
| 1052 | |
| 1053 | profile_length = data_length - prefix_length; |
| 1054 | |
| 1055 | if ( prefix_length > data_length || profile_length < 4) |
| 1056 | { |
| 1057 | png_free(png_ptr, chunkdata); |
| 1058 | png_warning(png_ptr, "Profile size field missing from iCCP chunk"); |
| 1059 | return; |
| 1060 | } |
| 1061 | |
| 1062 | /* Check the profile_size recorded in the first 32 bits of the ICC profile */ |
| 1063 | pC = (png_bytep)(chunkdata+prefix_length); |
| 1064 | profile_size = ((*(pC ))<<24) | |
| 1065 | ((*(pC+1))<<16) | |
| 1066 | ((*(pC+2))<< 8) | |
| 1067 | ((*(pC+3)) ); |
| 1068 | |
| 1069 | if(profile_size < profile_length) |
| 1070 | profile_length = profile_size; |
| 1071 | |
| 1072 | if(profile_size > profile_length) |
| 1073 | { |
| 1074 | png_free(png_ptr, chunkdata); |
| 1075 | png_warning(png_ptr, "Ignoring truncated iCCP profile.\n"); |
| 1076 | return; |
| 1077 | } |
| 1078 | |
| 1079 | png_set_iCCP(png_ptr, info_ptr, chunkdata, compression_type, |
| 1080 | chunkdata + prefix_length, profile_length); |
| 1081 | png_free(png_ptr, chunkdata); |
| 1082 | } |
| 1083 | #endif /* PNG_READ_iCCP_SUPPORTED */ |
| 1084 | |
| 1085 | #if defined(PNG_READ_sPLT_SUPPORTED) |
| 1086 | void /* PRIVATE */ |
| 1087 | png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1088 | /* Note: this does not properly handle chunks that are > 64K under DOS */ |
| 1089 | { |
| 1090 | png_bytep chunkdata; |
| 1091 | png_bytep entry_start; |
| 1092 | png_sPLT_t new_palette; |
| 1093 | #ifdef PNG_NO_POINTER_INDEXING |
| 1094 | png_sPLT_entryp pp; |
| 1095 | #endif |
| 1096 | int data_length, entry_size, i; |
| 1097 | png_uint_32 skip = 0; |
| 1098 | png_size_t slength; |
| 1099 | |
| 1100 | png_debug(1, "in png_handle_sPLT\n"); |
| 1101 | |
| 1102 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1103 | png_error(png_ptr, "Missing IHDR before sPLT"); |
| 1104 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1105 | { |
| 1106 | png_warning(png_ptr, "Invalid sPLT after IDAT"); |
| 1107 | png_crc_finish(png_ptr, length); |
| 1108 | return; |
| 1109 | } |
| 1110 | |
| 1111 | #ifdef PNG_MAX_MALLOC_64K |
| 1112 | if (length > (png_uint_32)65535L) |
| 1113 | { |
| 1114 | png_warning(png_ptr, "sPLT chunk too large to fit in memory"); |
| 1115 | skip = length - (png_uint_32)65535L; |
| 1116 | length = (png_uint_32)65535L; |
| 1117 | } |
| 1118 | #endif |
| 1119 | |
| 1120 | chunkdata = (png_bytep)png_malloc(png_ptr, length + 1); |
| 1121 | slength = (png_size_t)length; |
| 1122 | png_crc_read(png_ptr, (png_bytep)chunkdata, slength); |
| 1123 | |
| 1124 | if (png_crc_finish(png_ptr, skip)) |
| 1125 | { |
| 1126 | png_free(png_ptr, chunkdata); |
| 1127 | return; |
| 1128 | } |
| 1129 | |
| 1130 | chunkdata[slength] = 0x00; |
| 1131 | |
| 1132 | for (entry_start = chunkdata; *entry_start; entry_start++) |
| 1133 | /* empty loop to find end of name */ ; |
| 1134 | ++entry_start; |
| 1135 | |
| 1136 | /* a sample depth should follow the separator, and we should be on it */ |
| 1137 | if (entry_start > chunkdata + slength) |
| 1138 | { |
| 1139 | png_free(png_ptr, chunkdata); |
| 1140 | png_warning(png_ptr, "malformed sPLT chunk"); |
| 1141 | return; |
| 1142 | } |
| 1143 | |
| 1144 | new_palette.depth = *entry_start++; |
| 1145 | entry_size = (new_palette.depth == 8 ? 6 : 10); |
| 1146 | data_length = (slength - (entry_start - chunkdata)); |
| 1147 | |
| 1148 | /* integrity-check the data length */ |
| 1149 | if (data_length % entry_size) |
| 1150 | { |
| 1151 | png_free(png_ptr, chunkdata); |
| 1152 | png_warning(png_ptr, "sPLT chunk has bad length"); |
| 1153 | return; |
| 1154 | } |
| 1155 | |
| 1156 | new_palette.nentries = data_length / entry_size; |
| 1157 | new_palette.entries = (png_sPLT_entryp)png_malloc( |
| 1158 | png_ptr, new_palette.nentries * sizeof(png_sPLT_entry)); |
| 1159 | |
| 1160 | #ifndef PNG_NO_POINTER_INDEXING |
| 1161 | for (i = 0; i < new_palette.nentries; i++) |
| 1162 | { |
| 1163 | png_sPLT_entryp pp = new_palette.entries + i; |
| 1164 | |
| 1165 | if (new_palette.depth == 8) |
| 1166 | { |
| 1167 | pp->red = *entry_start++; |
| 1168 | pp->green = *entry_start++; |
| 1169 | pp->blue = *entry_start++; |
| 1170 | pp->alpha = *entry_start++; |
| 1171 | } |
| 1172 | else |
| 1173 | { |
| 1174 | pp->red = png_get_uint_16(entry_start); entry_start += 2; |
| 1175 | pp->green = png_get_uint_16(entry_start); entry_start += 2; |
| 1176 | pp->blue = png_get_uint_16(entry_start); entry_start += 2; |
| 1177 | pp->alpha = png_get_uint_16(entry_start); entry_start += 2; |
| 1178 | } |
| 1179 | pp->frequency = png_get_uint_16(entry_start); entry_start += 2; |
| 1180 | } |
| 1181 | #else |
| 1182 | pp = new_palette.entries; |
| 1183 | for (i = 0; i < new_palette.nentries; i++) |
| 1184 | { |
| 1185 | |
| 1186 | if (new_palette.depth == 8) |
| 1187 | { |
| 1188 | pp[i].red = *entry_start++; |
| 1189 | pp[i].green = *entry_start++; |
| 1190 | pp[i].blue = *entry_start++; |
| 1191 | pp[i].alpha = *entry_start++; |
| 1192 | } |
| 1193 | else |
| 1194 | { |
| 1195 | pp[i].red = png_get_uint_16(entry_start); entry_start += 2; |
| 1196 | pp[i].green = png_get_uint_16(entry_start); entry_start += 2; |
| 1197 | pp[i].blue = png_get_uint_16(entry_start); entry_start += 2; |
| 1198 | pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2; |
| 1199 | } |
| 1200 | pp->frequency = png_get_uint_16(entry_start); entry_start += 2; |
| 1201 | } |
| 1202 | #endif |
| 1203 | |
| 1204 | /* discard all chunk data except the name and stash that */ |
| 1205 | new_palette.name = (png_charp)chunkdata; |
| 1206 | |
| 1207 | png_set_sPLT(png_ptr, info_ptr, &new_palette, 1); |
| 1208 | |
| 1209 | png_free(png_ptr, chunkdata); |
| 1210 | png_free(png_ptr, new_palette.entries); |
| 1211 | } |
| 1212 | #endif /* PNG_READ_sPLT_SUPPORTED */ |
| 1213 | |
| 1214 | #if defined(PNG_READ_tRNS_SUPPORTED) |
| 1215 | void /* PRIVATE */ |
| 1216 | png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1217 | { |
| 1218 | png_byte readbuf[PNG_MAX_PALETTE_LENGTH]; |
| 1219 | |
| 1220 | png_debug(1, "in png_handle_tRNS\n"); |
| 1221 | |
| 1222 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1223 | png_error(png_ptr, "Missing IHDR before tRNS"); |
| 1224 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1225 | { |
| 1226 | png_warning(png_ptr, "Invalid tRNS after IDAT"); |
| 1227 | png_crc_finish(png_ptr, length); |
| 1228 | return; |
| 1229 | } |
| 1230 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) |
| 1231 | { |
| 1232 | png_warning(png_ptr, "Duplicate tRNS chunk"); |
| 1233 | png_crc_finish(png_ptr, length); |
| 1234 | return; |
| 1235 | } |
| 1236 | |
| 1237 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 1238 | { |
| 1239 | if (!(png_ptr->mode & PNG_HAVE_PLTE)) |
| 1240 | { |
| 1241 | /* Should be an error, but we can cope with it */ |
| 1242 | png_warning(png_ptr, "Missing PLTE before tRNS"); |
| 1243 | } |
| 1244 | else if (length > (png_uint_32)png_ptr->num_palette) |
| 1245 | { |
| 1246 | png_warning(png_ptr, "Incorrect tRNS chunk length"); |
| 1247 | png_crc_finish(png_ptr, length); |
| 1248 | return; |
| 1249 | } |
| 1250 | if (length == 0) |
| 1251 | { |
| 1252 | png_warning(png_ptr, "Zero length tRNS chunk"); |
| 1253 | png_crc_finish(png_ptr, length); |
| 1254 | return; |
| 1255 | } |
| 1256 | |
| 1257 | png_crc_read(png_ptr, readbuf, (png_size_t)length); |
| 1258 | png_ptr->num_trans = (png_uint_16)length; |
| 1259 | } |
| 1260 | else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) |
| 1261 | { |
| 1262 | png_byte buf[6]; |
| 1263 | |
| 1264 | if (length != 6) |
| 1265 | { |
| 1266 | png_warning(png_ptr, "Incorrect tRNS chunk length"); |
| 1267 | png_crc_finish(png_ptr, length); |
| 1268 | return; |
| 1269 | } |
| 1270 | |
| 1271 | png_crc_read(png_ptr, buf, (png_size_t)length); |
| 1272 | png_ptr->num_trans = 1; |
| 1273 | png_ptr->trans_values.red = png_get_uint_16(buf); |
| 1274 | png_ptr->trans_values.green = png_get_uint_16(buf + 2); |
| 1275 | png_ptr->trans_values.blue = png_get_uint_16(buf + 4); |
| 1276 | } |
| 1277 | else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) |
| 1278 | { |
| 1279 | png_byte buf[6]; |
| 1280 | |
| 1281 | if (length != 2) |
| 1282 | { |
| 1283 | png_warning(png_ptr, "Incorrect tRNS chunk length"); |
| 1284 | png_crc_finish(png_ptr, length); |
| 1285 | return; |
| 1286 | } |
| 1287 | |
| 1288 | png_crc_read(png_ptr, buf, 2); |
| 1289 | png_ptr->num_trans = 1; |
| 1290 | png_ptr->trans_values.gray = png_get_uint_16(buf); |
| 1291 | } |
| 1292 | else |
| 1293 | { |
| 1294 | png_warning(png_ptr, "tRNS chunk not allowed with alpha channel"); |
| 1295 | png_crc_finish(png_ptr, length); |
| 1296 | return; |
| 1297 | } |
| 1298 | |
| 1299 | if (png_crc_finish(png_ptr, 0)) |
| 1300 | return; |
| 1301 | |
| 1302 | png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans, |
| 1303 | &(png_ptr->trans_values)); |
| 1304 | } |
| 1305 | #endif |
| 1306 | |
| 1307 | #if defined(PNG_READ_bKGD_SUPPORTED) |
| 1308 | void /* PRIVATE */ |
| 1309 | png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1310 | { |
| 1311 | png_size_t truelen; |
| 1312 | png_byte buf[6]; |
| 1313 | |
| 1314 | png_debug(1, "in png_handle_bKGD\n"); |
| 1315 | |
| 1316 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1317 | png_error(png_ptr, "Missing IHDR before bKGD"); |
| 1318 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1319 | { |
| 1320 | png_warning(png_ptr, "Invalid bKGD after IDAT"); |
| 1321 | png_crc_finish(png_ptr, length); |
| 1322 | return; |
| 1323 | } |
| 1324 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 1325 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
| 1326 | { |
| 1327 | png_warning(png_ptr, "Missing PLTE before bKGD"); |
| 1328 | png_crc_finish(png_ptr, length); |
| 1329 | return; |
| 1330 | } |
| 1331 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)) |
| 1332 | { |
| 1333 | png_warning(png_ptr, "Duplicate bKGD chunk"); |
| 1334 | png_crc_finish(png_ptr, length); |
| 1335 | return; |
| 1336 | } |
| 1337 | |
| 1338 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 1339 | truelen = 1; |
| 1340 | else if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) |
| 1341 | truelen = 6; |
| 1342 | else |
| 1343 | truelen = 2; |
| 1344 | |
| 1345 | if (length != truelen) |
| 1346 | { |
| 1347 | png_warning(png_ptr, "Incorrect bKGD chunk length"); |
| 1348 | png_crc_finish(png_ptr, length); |
| 1349 | return; |
| 1350 | } |
| 1351 | |
| 1352 | png_crc_read(png_ptr, buf, truelen); |
| 1353 | if (png_crc_finish(png_ptr, 0)) |
| 1354 | return; |
| 1355 | |
| 1356 | /* We convert the index value into RGB components so that we can allow |
| 1357 | * arbitrary RGB values for background when we have transparency, and |
| 1358 | * so it is easy to determine the RGB values of the background color |
| 1359 | * from the info_ptr struct. */ |
| 1360 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 1361 | { |
| 1362 | png_ptr->background.index = buf[0]; |
| 1363 | if(info_ptr->num_palette) |
| 1364 | { |
| 1365 | if(buf[0] > info_ptr->num_palette) |
| 1366 | { |
| 1367 | png_warning(png_ptr, "Incorrect bKGD chunk index value"); |
| 1368 | return; |
| 1369 | } |
| 1370 | png_ptr->background.red = |
| 1371 | (png_uint_16)png_ptr->palette[buf[0]].red; |
| 1372 | png_ptr->background.green = |
| 1373 | (png_uint_16)png_ptr->palette[buf[0]].green; |
| 1374 | png_ptr->background.blue = |
| 1375 | (png_uint_16)png_ptr->palette[buf[0]].blue; |
| 1376 | } |
| 1377 | } |
| 1378 | else if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) /* GRAY */ |
| 1379 | { |
| 1380 | png_ptr->background.red = |
| 1381 | png_ptr->background.green = |
| 1382 | png_ptr->background.blue = |
| 1383 | png_ptr->background.gray = png_get_uint_16(buf); |
| 1384 | } |
| 1385 | else |
| 1386 | { |
| 1387 | png_ptr->background.red = png_get_uint_16(buf); |
| 1388 | png_ptr->background.green = png_get_uint_16(buf + 2); |
| 1389 | png_ptr->background.blue = png_get_uint_16(buf + 4); |
| 1390 | } |
| 1391 | |
| 1392 | png_set_bKGD(png_ptr, info_ptr, &(png_ptr->background)); |
| 1393 | } |
| 1394 | #endif |
| 1395 | |
| 1396 | #if defined(PNG_READ_hIST_SUPPORTED) |
| 1397 | void /* PRIVATE */ |
| 1398 | png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1399 | { |
| 1400 | int num, i; |
| 1401 | png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH]; |
| 1402 | |
| 1403 | png_debug(1, "in png_handle_hIST\n"); |
| 1404 | |
| 1405 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1406 | png_error(png_ptr, "Missing IHDR before hIST"); |
| 1407 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1408 | { |
| 1409 | png_warning(png_ptr, "Invalid hIST after IDAT"); |
| 1410 | png_crc_finish(png_ptr, length); |
| 1411 | return; |
| 1412 | } |
| 1413 | else if (!(png_ptr->mode & PNG_HAVE_PLTE)) |
| 1414 | { |
| 1415 | png_warning(png_ptr, "Missing PLTE before hIST"); |
| 1416 | png_crc_finish(png_ptr, length); |
| 1417 | return; |
| 1418 | } |
| 1419 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)) |
| 1420 | { |
| 1421 | png_warning(png_ptr, "Duplicate hIST chunk"); |
| 1422 | png_crc_finish(png_ptr, length); |
| 1423 | return; |
| 1424 | } |
| 1425 | |
| 1426 | num = (int)length / 2 ; |
| 1427 | if (num != png_ptr->num_palette) |
| 1428 | { |
| 1429 | png_warning(png_ptr, "Incorrect hIST chunk length"); |
| 1430 | png_crc_finish(png_ptr, length); |
| 1431 | return; |
| 1432 | } |
| 1433 | |
| 1434 | for (i = 0; i < num; i++) |
| 1435 | { |
| 1436 | png_byte buf[2]; |
| 1437 | |
| 1438 | png_crc_read(png_ptr, buf, 2); |
| 1439 | readbuf[i] = png_get_uint_16(buf); |
| 1440 | } |
| 1441 | |
| 1442 | if (png_crc_finish(png_ptr, 0)) |
| 1443 | return; |
| 1444 | |
| 1445 | png_set_hIST(png_ptr, info_ptr, readbuf); |
| 1446 | } |
| 1447 | #endif |
| 1448 | |
| 1449 | #if defined(PNG_READ_pHYs_SUPPORTED) |
| 1450 | void /* PRIVATE */ |
| 1451 | png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1452 | { |
| 1453 | png_byte buf[9]; |
| 1454 | png_uint_32 res_x, res_y; |
| 1455 | int unit_type; |
| 1456 | |
| 1457 | png_debug(1, "in png_handle_pHYs\n"); |
| 1458 | |
| 1459 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1460 | png_error(png_ptr, "Missing IHDR before pHYs"); |
| 1461 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1462 | { |
| 1463 | png_warning(png_ptr, "Invalid pHYs after IDAT"); |
| 1464 | png_crc_finish(png_ptr, length); |
| 1465 | return; |
| 1466 | } |
| 1467 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) |
| 1468 | { |
| 1469 | png_warning(png_ptr, "Duplicate pHYs chunk"); |
| 1470 | png_crc_finish(png_ptr, length); |
| 1471 | return; |
| 1472 | } |
| 1473 | |
| 1474 | if (length != 9) |
| 1475 | { |
| 1476 | png_warning(png_ptr, "Incorrect pHYs chunk length"); |
| 1477 | png_crc_finish(png_ptr, length); |
| 1478 | return; |
| 1479 | } |
| 1480 | |
| 1481 | png_crc_read(png_ptr, buf, 9); |
| 1482 | if (png_crc_finish(png_ptr, 0)) |
| 1483 | return; |
| 1484 | |
| 1485 | res_x = png_get_uint_32(buf); |
| 1486 | res_y = png_get_uint_32(buf + 4); |
| 1487 | unit_type = buf[8]; |
| 1488 | png_set_pHYs(png_ptr, info_ptr, res_x, res_y, unit_type); |
| 1489 | } |
| 1490 | #endif |
| 1491 | |
| 1492 | #if defined(PNG_READ_oFFs_SUPPORTED) |
| 1493 | void /* PRIVATE */ |
| 1494 | png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1495 | { |
| 1496 | png_byte buf[9]; |
| 1497 | png_int_32 offset_x, offset_y; |
| 1498 | int unit_type; |
| 1499 | |
| 1500 | png_debug(1, "in png_handle_oFFs\n"); |
| 1501 | |
| 1502 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1503 | png_error(png_ptr, "Missing IHDR before oFFs"); |
| 1504 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1505 | { |
| 1506 | png_warning(png_ptr, "Invalid oFFs after IDAT"); |
| 1507 | png_crc_finish(png_ptr, length); |
| 1508 | return; |
| 1509 | } |
| 1510 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) |
| 1511 | { |
| 1512 | png_warning(png_ptr, "Duplicate oFFs chunk"); |
| 1513 | png_crc_finish(png_ptr, length); |
| 1514 | return; |
| 1515 | } |
| 1516 | |
| 1517 | if (length != 9) |
| 1518 | { |
| 1519 | png_warning(png_ptr, "Incorrect oFFs chunk length"); |
| 1520 | png_crc_finish(png_ptr, length); |
| 1521 | return; |
| 1522 | } |
| 1523 | |
| 1524 | png_crc_read(png_ptr, buf, 9); |
| 1525 | if (png_crc_finish(png_ptr, 0)) |
| 1526 | return; |
| 1527 | |
| 1528 | offset_x = png_get_int_32(buf); |
| 1529 | offset_y = png_get_int_32(buf + 4); |
| 1530 | unit_type = buf[8]; |
| 1531 | png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y, unit_type); |
| 1532 | } |
| 1533 | #endif |
| 1534 | |
| 1535 | #if defined(PNG_READ_pCAL_SUPPORTED) |
| 1536 | /* read the pCAL chunk (described in the PNG Extensions document) */ |
| 1537 | void /* PRIVATE */ |
| 1538 | png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1539 | { |
| 1540 | png_charp purpose; |
| 1541 | png_int_32 X0, X1; |
| 1542 | png_byte type, nparams; |
| 1543 | png_charp buf, units, endptr; |
| 1544 | png_charpp params; |
| 1545 | png_size_t slength; |
| 1546 | int i; |
| 1547 | |
| 1548 | png_debug(1, "in png_handle_pCAL\n"); |
| 1549 | |
| 1550 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1551 | png_error(png_ptr, "Missing IHDR before pCAL"); |
| 1552 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1553 | { |
| 1554 | png_warning(png_ptr, "Invalid pCAL after IDAT"); |
| 1555 | png_crc_finish(png_ptr, length); |
| 1556 | return; |
| 1557 | } |
| 1558 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)) |
| 1559 | { |
| 1560 | png_warning(png_ptr, "Duplicate pCAL chunk"); |
| 1561 | png_crc_finish(png_ptr, length); |
| 1562 | return; |
| 1563 | } |
| 1564 | |
| 1565 | png_debug1(2, "Allocating and reading pCAL chunk data (%lu bytes)\n", |
| 1566 | length + 1); |
| 1567 | purpose = (png_charp)png_malloc_warn(png_ptr, length + 1); |
| 1568 | if (purpose == NULL) |
| 1569 | { |
| 1570 | png_warning(png_ptr, "No memory for pCAL purpose."); |
| 1571 | return; |
| 1572 | } |
| 1573 | slength = (png_size_t)length; |
| 1574 | png_crc_read(png_ptr, (png_bytep)purpose, slength); |
| 1575 | |
| 1576 | if (png_crc_finish(png_ptr, 0)) |
| 1577 | { |
| 1578 | png_free(png_ptr, purpose); |
| 1579 | return; |
| 1580 | } |
| 1581 | |
| 1582 | purpose[slength] = 0x00; /* null terminate the last string */ |
| 1583 | |
| 1584 | png_debug(3, "Finding end of pCAL purpose string\n"); |
| 1585 | for (buf = purpose; *buf; buf++) |
| 1586 | /* empty loop */ ; |
| 1587 | |
| 1588 | endptr = purpose + slength; |
| 1589 | |
| 1590 | /* We need to have at least 12 bytes after the purpose string |
| 1591 | in order to get the parameter information. */ |
| 1592 | if (endptr <= buf + 12) |
| 1593 | { |
| 1594 | png_warning(png_ptr, "Invalid pCAL data"); |
| 1595 | png_free(png_ptr, purpose); |
| 1596 | return; |
| 1597 | } |
| 1598 | |
| 1599 | png_debug(3, "Reading pCAL X0, X1, type, nparams, and units\n"); |
| 1600 | X0 = png_get_int_32((png_bytep)buf+1); |
| 1601 | X1 = png_get_int_32((png_bytep)buf+5); |
| 1602 | type = buf[9]; |
| 1603 | nparams = buf[10]; |
| 1604 | units = buf + 11; |
| 1605 | |
| 1606 | png_debug(3, "Checking pCAL equation type and number of parameters\n"); |
| 1607 | /* Check that we have the right number of parameters for known |
| 1608 | equation types. */ |
| 1609 | if ((type == PNG_EQUATION_LINEAR && nparams != 2) || |
| 1610 | (type == PNG_EQUATION_BASE_E && nparams != 3) || |
| 1611 | (type == PNG_EQUATION_ARBITRARY && nparams != 3) || |
| 1612 | (type == PNG_EQUATION_HYPERBOLIC && nparams != 4)) |
| 1613 | { |
| 1614 | png_warning(png_ptr, "Invalid pCAL parameters for equation type"); |
| 1615 | png_free(png_ptr, purpose); |
| 1616 | return; |
| 1617 | } |
| 1618 | else if (type >= PNG_EQUATION_LAST) |
| 1619 | { |
| 1620 | png_warning(png_ptr, "Unrecognized equation type for pCAL chunk"); |
| 1621 | } |
| 1622 | |
| 1623 | for (buf = units; *buf; buf++) |
| 1624 | /* Empty loop to move past the units string. */ ; |
| 1625 | |
| 1626 | png_debug(3, "Allocating pCAL parameters array\n"); |
| 1627 | params = (png_charpp)png_malloc_warn(png_ptr, (png_uint_32)(nparams |
| 1628 | *sizeof(png_charp))) ; |
| 1629 | if (params == NULL) |
| 1630 | { |
| 1631 | png_free(png_ptr, purpose); |
| 1632 | png_warning(png_ptr, "No memory for pCAL params."); |
| 1633 | return; |
| 1634 | } |
| 1635 | |
| 1636 | /* Get pointers to the start of each parameter string. */ |
| 1637 | for (i = 0; i < (int)nparams; i++) |
| 1638 | { |
| 1639 | buf++; /* Skip the null string terminator from previous parameter. */ |
| 1640 | |
| 1641 | png_debug1(3, "Reading pCAL parameter %d\n", i); |
| 1642 | for (params[i] = buf; *buf != 0x00 && buf <= endptr; buf++) |
| 1643 | /* Empty loop to move past each parameter string */ ; |
| 1644 | |
| 1645 | /* Make sure we haven't run out of data yet */ |
| 1646 | if (buf > endptr) |
| 1647 | { |
| 1648 | png_warning(png_ptr, "Invalid pCAL data"); |
| 1649 | png_free(png_ptr, purpose); |
| 1650 | png_free(png_ptr, params); |
| 1651 | return; |
| 1652 | } |
| 1653 | } |
| 1654 | |
| 1655 | png_set_pCAL(png_ptr, info_ptr, purpose, X0, X1, type, nparams, |
| 1656 | units, params); |
| 1657 | |
| 1658 | png_free(png_ptr, purpose); |
| 1659 | png_free(png_ptr, params); |
| 1660 | } |
| 1661 | #endif |
| 1662 | |
| 1663 | #if defined(PNG_READ_sCAL_SUPPORTED) |
| 1664 | /* read the sCAL chunk */ |
| 1665 | void /* PRIVATE */ |
| 1666 | png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1667 | { |
| 1668 | png_charp buffer, ep; |
| 1669 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1670 | double width, height; |
| 1671 | png_charp vp; |
| 1672 | #else |
| 1673 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 1674 | png_charp swidth, sheight; |
| 1675 | #endif |
| 1676 | #endif |
| 1677 | png_size_t slength; |
| 1678 | |
| 1679 | png_debug(1, "in png_handle_sCAL\n"); |
| 1680 | |
| 1681 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1682 | png_error(png_ptr, "Missing IHDR before sCAL"); |
| 1683 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1684 | { |
| 1685 | png_warning(png_ptr, "Invalid sCAL after IDAT"); |
| 1686 | png_crc_finish(png_ptr, length); |
| 1687 | return; |
| 1688 | } |
| 1689 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL)) |
| 1690 | { |
| 1691 | png_warning(png_ptr, "Duplicate sCAL chunk"); |
| 1692 | png_crc_finish(png_ptr, length); |
| 1693 | return; |
| 1694 | } |
| 1695 | |
| 1696 | png_debug1(2, "Allocating and reading sCAL chunk data (%lu bytes)\n", |
| 1697 | length + 1); |
| 1698 | buffer = (png_charp)png_malloc_warn(png_ptr, length + 1); |
| 1699 | if (buffer == NULL) |
| 1700 | { |
| 1701 | png_warning(png_ptr, "Out of memory while processing sCAL chunk"); |
| 1702 | return; |
| 1703 | } |
| 1704 | slength = (png_size_t)length; |
| 1705 | png_crc_read(png_ptr, (png_bytep)buffer, slength); |
| 1706 | |
| 1707 | if (png_crc_finish(png_ptr, 0)) |
| 1708 | { |
| 1709 | png_free(png_ptr, buffer); |
| 1710 | return; |
| 1711 | } |
| 1712 | |
| 1713 | buffer[slength] = 0x00; /* null terminate the last string */ |
| 1714 | |
| 1715 | ep = buffer + 1; /* skip unit byte */ |
| 1716 | |
| 1717 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1718 | width = strtod(ep, &vp); |
| 1719 | if (*vp) |
| 1720 | { |
| 1721 | png_warning(png_ptr, "malformed width string in sCAL chunk"); |
| 1722 | return; |
| 1723 | } |
| 1724 | #else |
| 1725 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 1726 | swidth = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1); |
| 1727 | if (swidth == NULL) |
| 1728 | { |
| 1729 | png_warning(png_ptr, "Out of memory while processing sCAL chunk width"); |
| 1730 | return; |
| 1731 | } |
| 1732 | png_memcpy(swidth, ep, (png_size_t)png_strlen(ep)); |
| 1733 | #endif |
| 1734 | #endif |
| 1735 | |
| 1736 | for (ep = buffer; *ep; ep++) |
| 1737 | /* empty loop */ ; |
| 1738 | ep++; |
| 1739 | |
| 1740 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1741 | height = strtod(ep, &vp); |
| 1742 | if (*vp) |
| 1743 | { |
| 1744 | png_warning(png_ptr, "malformed height string in sCAL chunk"); |
| 1745 | return; |
| 1746 | } |
| 1747 | #else |
| 1748 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 1749 | sheight = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1); |
| 1750 | if (swidth == NULL) |
| 1751 | { |
| 1752 | png_warning(png_ptr, "Out of memory while processing sCAL chunk height"); |
| 1753 | return; |
| 1754 | } |
| 1755 | png_memcpy(sheight, ep, (png_size_t)png_strlen(ep)); |
| 1756 | #endif |
| 1757 | #endif |
| 1758 | |
| 1759 | if (buffer + slength < ep |
| 1760 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1761 | || width <= 0. || height <= 0. |
| 1762 | #endif |
| 1763 | ) |
| 1764 | { |
| 1765 | png_warning(png_ptr, "Invalid sCAL data"); |
| 1766 | png_free(png_ptr, buffer); |
| 1767 | #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) |
| 1768 | png_free(png_ptr, swidth); |
| 1769 | png_free(png_ptr, sheight); |
| 1770 | #endif |
| 1771 | return; |
| 1772 | } |
| 1773 | |
| 1774 | |
| 1775 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1776 | png_set_sCAL(png_ptr, info_ptr, buffer[0], width, height); |
| 1777 | #else |
| 1778 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 1779 | png_set_sCAL_s(png_ptr, info_ptr, buffer[0], swidth, sheight); |
| 1780 | #endif |
| 1781 | #endif |
| 1782 | |
| 1783 | png_free(png_ptr, buffer); |
| 1784 | #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) |
| 1785 | png_free(png_ptr, swidth); |
| 1786 | png_free(png_ptr, sheight); |
| 1787 | #endif |
| 1788 | } |
| 1789 | #endif |
| 1790 | |
| 1791 | #if defined(PNG_READ_tIME_SUPPORTED) |
| 1792 | void /* PRIVATE */ |
| 1793 | png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1794 | { |
| 1795 | png_byte buf[7]; |
| 1796 | png_time mod_time; |
| 1797 | |
| 1798 | png_debug(1, "in png_handle_tIME\n"); |
| 1799 | |
| 1800 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1801 | png_error(png_ptr, "Out of place tIME chunk"); |
| 1802 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)) |
| 1803 | { |
| 1804 | png_warning(png_ptr, "Duplicate tIME chunk"); |
| 1805 | png_crc_finish(png_ptr, length); |
| 1806 | return; |
| 1807 | } |
| 1808 | |
| 1809 | if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1810 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 1811 | |
| 1812 | if (length != 7) |
| 1813 | { |
| 1814 | png_warning(png_ptr, "Incorrect tIME chunk length"); |
| 1815 | png_crc_finish(png_ptr, length); |
| 1816 | return; |
| 1817 | } |
| 1818 | |
| 1819 | png_crc_read(png_ptr, buf, 7); |
| 1820 | if (png_crc_finish(png_ptr, 0)) |
| 1821 | return; |
| 1822 | |
| 1823 | mod_time.second = buf[6]; |
| 1824 | mod_time.minute = buf[5]; |
| 1825 | mod_time.hour = buf[4]; |
| 1826 | mod_time.day = buf[3]; |
| 1827 | mod_time.month = buf[2]; |
| 1828 | mod_time.year = png_get_uint_16(buf); |
| 1829 | |
| 1830 | png_set_tIME(png_ptr, info_ptr, &mod_time); |
| 1831 | } |
| 1832 | #endif |
| 1833 | |
| 1834 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 1835 | /* Note: this does not properly handle chunks that are > 64K under DOS */ |
| 1836 | void /* PRIVATE */ |
| 1837 | png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1838 | { |
| 1839 | png_textp text_ptr; |
| 1840 | png_charp key; |
| 1841 | png_charp text; |
| 1842 | png_uint_32 skip = 0; |
| 1843 | png_size_t slength; |
| 1844 | int ret; |
| 1845 | |
| 1846 | png_debug(1, "in png_handle_tEXt\n"); |
| 1847 | |
| 1848 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1849 | png_error(png_ptr, "Missing IHDR before tEXt"); |
| 1850 | |
| 1851 | if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1852 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 1853 | |
| 1854 | #ifdef PNG_MAX_MALLOC_64K |
| 1855 | if (length > (png_uint_32)65535L) |
| 1856 | { |
| 1857 | png_warning(png_ptr, "tEXt chunk too large to fit in memory"); |
| 1858 | skip = length - (png_uint_32)65535L; |
| 1859 | length = (png_uint_32)65535L; |
| 1860 | } |
| 1861 | #endif |
| 1862 | |
| 1863 | key = (png_charp)png_malloc_warn(png_ptr, length + 1); |
| 1864 | if (key == NULL) |
| 1865 | { |
| 1866 | png_warning(png_ptr, "No memory to process text chunk."); |
| 1867 | return; |
| 1868 | } |
| 1869 | slength = (png_size_t)length; |
| 1870 | png_crc_read(png_ptr, (png_bytep)key, slength); |
| 1871 | |
| 1872 | if (png_crc_finish(png_ptr, skip)) |
| 1873 | { |
| 1874 | png_free(png_ptr, key); |
| 1875 | return; |
| 1876 | } |
| 1877 | |
| 1878 | key[slength] = 0x00; |
| 1879 | |
| 1880 | for (text = key; *text; text++) |
| 1881 | /* empty loop to find end of key */ ; |
| 1882 | |
| 1883 | if (text != key + slength) |
| 1884 | text++; |
| 1885 | |
| 1886 | text_ptr = (png_textp)png_malloc_warn(png_ptr, (png_uint_32)sizeof(png_text)); |
| 1887 | if (text_ptr == NULL) |
| 1888 | { |
| 1889 | png_warning(png_ptr, "Not enough memory to process text chunk."); |
| 1890 | png_free(png_ptr, key); |
| 1891 | return; |
| 1892 | } |
| 1893 | text_ptr->compression = PNG_TEXT_COMPRESSION_NONE; |
| 1894 | text_ptr->key = key; |
| 1895 | #ifdef PNG_iTXt_SUPPORTED |
| 1896 | text_ptr->lang = NULL; |
| 1897 | text_ptr->lang_key = NULL; |
| 1898 | text_ptr->itxt_length = 0; |
| 1899 | #endif |
| 1900 | text_ptr->text = text; |
| 1901 | text_ptr->text_length = png_strlen(text); |
| 1902 | |
| 1903 | ret=png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
| 1904 | |
| 1905 | png_free(png_ptr, key); |
| 1906 | png_free(png_ptr, text_ptr); |
| 1907 | if (ret) |
| 1908 | png_warning(png_ptr, "Insufficient memory to process text chunk."); |
| 1909 | } |
| 1910 | #endif |
| 1911 | |
| 1912 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 1913 | /* note: this does not correctly handle chunks that are > 64K under DOS */ |
| 1914 | void /* PRIVATE */ |
| 1915 | png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1916 | { |
| 1917 | png_textp text_ptr; |
| 1918 | png_charp chunkdata; |
| 1919 | png_charp text; |
| 1920 | int comp_type; |
| 1921 | int ret; |
| 1922 | png_size_t slength, prefix_len, data_len; |
| 1923 | |
| 1924 | png_debug(1, "in png_handle_zTXt\n"); |
| 1925 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1926 | png_error(png_ptr, "Missing IHDR before zTXt"); |
| 1927 | |
| 1928 | if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1929 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 1930 | |
| 1931 | #ifdef PNG_MAX_MALLOC_64K |
| 1932 | /* We will no doubt have problems with chunks even half this size, but |
| 1933 | there is no hard and fast rule to tell us where to stop. */ |
| 1934 | if (length > (png_uint_32)65535L) |
| 1935 | { |
| 1936 | png_warning(png_ptr,"zTXt chunk too large to fit in memory"); |
| 1937 | png_crc_finish(png_ptr, length); |
| 1938 | return; |
| 1939 | } |
| 1940 | #endif |
| 1941 | |
| 1942 | chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); |
| 1943 | if (chunkdata == NULL) |
| 1944 | { |
| 1945 | png_warning(png_ptr,"Out of memory processing zTXt chunk."); |
| 1946 | return; |
| 1947 | } |
| 1948 | slength = (png_size_t)length; |
| 1949 | png_crc_read(png_ptr, (png_bytep)chunkdata, slength); |
| 1950 | if (png_crc_finish(png_ptr, 0)) |
| 1951 | { |
| 1952 | png_free(png_ptr, chunkdata); |
| 1953 | return; |
| 1954 | } |
| 1955 | |
| 1956 | chunkdata[slength] = 0x00; |
| 1957 | |
| 1958 | for (text = chunkdata; *text; text++) |
| 1959 | /* empty loop */ ; |
| 1960 | |
| 1961 | /* zTXt must have some text after the chunkdataword */ |
| 1962 | if (text == chunkdata + slength) |
| 1963 | { |
| 1964 | comp_type = PNG_TEXT_COMPRESSION_NONE; |
| 1965 | png_warning(png_ptr, "Zero length zTXt chunk"); |
| 1966 | } |
| 1967 | else |
| 1968 | { |
| 1969 | comp_type = *(++text); |
| 1970 | if (comp_type != PNG_TEXT_COMPRESSION_zTXt) |
| 1971 | { |
| 1972 | png_warning(png_ptr, "Unknown compression type in zTXt chunk"); |
| 1973 | comp_type = PNG_TEXT_COMPRESSION_zTXt; |
| 1974 | } |
| 1975 | text++; /* skip the compression_method byte */ |
| 1976 | } |
| 1977 | prefix_len = text - chunkdata; |
| 1978 | |
| 1979 | chunkdata = (png_charp)png_decompress_chunk(png_ptr, comp_type, chunkdata, |
| 1980 | (png_size_t)length, prefix_len, &data_len); |
| 1981 | |
| 1982 | text_ptr = (png_textp)png_malloc_warn(png_ptr, (png_uint_32)sizeof(png_text)); |
| 1983 | if (text_ptr == NULL) |
| 1984 | { |
| 1985 | png_warning(png_ptr,"Not enough memory to process zTXt chunk."); |
| 1986 | png_free(png_ptr, chunkdata); |
| 1987 | return; |
| 1988 | } |
| 1989 | text_ptr->compression = comp_type; |
| 1990 | text_ptr->key = chunkdata; |
| 1991 | #ifdef PNG_iTXt_SUPPORTED |
| 1992 | text_ptr->lang = NULL; |
| 1993 | text_ptr->lang_key = NULL; |
| 1994 | text_ptr->itxt_length = 0; |
| 1995 | #endif |
| 1996 | text_ptr->text = chunkdata + prefix_len; |
| 1997 | text_ptr->text_length = data_len; |
| 1998 | |
| 1999 | ret=png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
| 2000 | |
| 2001 | png_free(png_ptr, text_ptr); |
| 2002 | png_free(png_ptr, chunkdata); |
| 2003 | if (ret) |
| 2004 | png_error(png_ptr, "Insufficient memory to store zTXt chunk."); |
| 2005 | } |
| 2006 | #endif |
| 2007 | |
| 2008 | #if defined(PNG_READ_iTXt_SUPPORTED) |
| 2009 | /* note: this does not correctly handle chunks that are > 64K under DOS */ |
| 2010 | void /* PRIVATE */ |
| 2011 | png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 2012 | { |
| 2013 | png_textp text_ptr; |
| 2014 | png_charp chunkdata; |
| 2015 | png_charp key, lang, text, lang_key; |
| 2016 | int comp_flag; |
| 2017 | int comp_type = 0; |
| 2018 | int ret; |
| 2019 | png_size_t slength, prefix_len, data_len; |
| 2020 | |
| 2021 | png_debug(1, "in png_handle_iTXt\n"); |
| 2022 | |
| 2023 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 2024 | png_error(png_ptr, "Missing IHDR before iTXt"); |
| 2025 | |
| 2026 | if (png_ptr->mode & PNG_HAVE_IDAT) |
| 2027 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 2028 | |
| 2029 | #ifdef PNG_MAX_MALLOC_64K |
| 2030 | /* We will no doubt have problems with chunks even half this size, but |
| 2031 | there is no hard and fast rule to tell us where to stop. */ |
| 2032 | if (length > (png_uint_32)65535L) |
| 2033 | { |
| 2034 | png_warning(png_ptr,"iTXt chunk too large to fit in memory"); |
| 2035 | png_crc_finish(png_ptr, length); |
| 2036 | return; |
| 2037 | } |
| 2038 | #endif |
| 2039 | |
| 2040 | chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); |
| 2041 | if (chunkdata == NULL) |
| 2042 | { |
| 2043 | png_warning(png_ptr, "No memory to process iTXt chunk."); |
| 2044 | return; |
| 2045 | } |
| 2046 | slength = (png_size_t)length; |
| 2047 | png_crc_read(png_ptr, (png_bytep)chunkdata, slength); |
| 2048 | if (png_crc_finish(png_ptr, 0)) |
| 2049 | { |
| 2050 | png_free(png_ptr, chunkdata); |
| 2051 | return; |
| 2052 | } |
| 2053 | |
| 2054 | chunkdata[slength] = 0x00; |
| 2055 | |
| 2056 | for (lang = chunkdata; *lang; lang++) |
| 2057 | /* empty loop */ ; |
| 2058 | lang++; /* skip NUL separator */ |
| 2059 | |
| 2060 | /* iTXt must have a language tag (possibly empty), two compression bytes, |
| 2061 | translated keyword (possibly empty), and possibly some text after the |
| 2062 | keyword */ |
| 2063 | |
| 2064 | if (lang >= chunkdata + slength) |
| 2065 | { |
| 2066 | comp_flag = PNG_TEXT_COMPRESSION_NONE; |
| 2067 | png_warning(png_ptr, "Zero length iTXt chunk"); |
| 2068 | } |
| 2069 | else |
| 2070 | { |
| 2071 | comp_flag = *lang++; |
| 2072 | comp_type = *lang++; |
| 2073 | } |
| 2074 | |
| 2075 | for (lang_key = lang; *lang_key; lang_key++) |
| 2076 | /* empty loop */ ; |
| 2077 | lang_key++; /* skip NUL separator */ |
| 2078 | |
| 2079 | for (text = lang_key; *text; text++) |
| 2080 | /* empty loop */ ; |
| 2081 | text++; /* skip NUL separator */ |
| 2082 | |
| 2083 | prefix_len = text - chunkdata; |
| 2084 | |
| 2085 | key=chunkdata; |
| 2086 | if (comp_flag) |
| 2087 | chunkdata = png_decompress_chunk(png_ptr, comp_type, chunkdata, |
| 2088 | (size_t)length, prefix_len, &data_len); |
| 2089 | else |
| 2090 | data_len=png_strlen(chunkdata + prefix_len); |
| 2091 | text_ptr = (png_textp)png_malloc_warn(png_ptr, (png_uint_32)sizeof(png_text)); |
| 2092 | if (text_ptr == NULL) |
| 2093 | { |
| 2094 | png_warning(png_ptr,"Not enough memory to process iTXt chunk."); |
| 2095 | png_free(png_ptr, chunkdata); |
| 2096 | return; |
| 2097 | } |
| 2098 | text_ptr->compression = (int)comp_flag + 1; |
| 2099 | text_ptr->lang_key = chunkdata+(lang_key-key); |
| 2100 | text_ptr->lang = chunkdata+(lang-key); |
| 2101 | text_ptr->itxt_length = data_len; |
| 2102 | text_ptr->text_length = 0; |
| 2103 | text_ptr->key = chunkdata; |
| 2104 | text_ptr->text = chunkdata + prefix_len; |
| 2105 | |
| 2106 | ret=png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
| 2107 | |
| 2108 | png_free(png_ptr, text_ptr); |
| 2109 | png_free(png_ptr, chunkdata); |
| 2110 | if (ret) |
| 2111 | png_error(png_ptr, "Insufficient memory to store iTXt chunk."); |
| 2112 | } |
| 2113 | #endif |
| 2114 | |
| 2115 | /* This function is called when we haven't found a handler for a |
| 2116 | chunk. If there isn't a problem with the chunk itself (ie bad |
| 2117 | chunk name, CRC, or a critical chunk), the chunk is silently ignored |
| 2118 | -- unless the PNG_FLAG_UNKNOWN_CHUNKS_SUPPORTED flag is on in which |
| 2119 | case it will be saved away to be written out later. */ |
| 2120 | void /* PRIVATE */ |
| 2121 | png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 2122 | { |
| 2123 | png_uint_32 skip = 0; |
| 2124 | |
| 2125 | png_debug(1, "in png_handle_unknown\n"); |
| 2126 | |
| 2127 | if (png_ptr->mode & PNG_HAVE_IDAT) |
| 2128 | { |
| 2129 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 2130 | PNG_IDAT; |
| 2131 | #endif |
| 2132 | if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* not an IDAT */ |
| 2133 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 2134 | } |
| 2135 | |
| 2136 | png_check_chunk_name(png_ptr, png_ptr->chunk_name); |
| 2137 | |
| 2138 | if (!(png_ptr->chunk_name[0] & 0x20)) |
| 2139 | { |
| 2140 | #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) |
| 2141 | if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != |
| 2142 | HANDLE_CHUNK_ALWAYS |
| 2143 | #if defined(PNG_READ_USER_CHUNKS_SUPPORTED) |
| 2144 | && png_ptr->read_user_chunk_fn == NULL |
| 2145 | #endif |
| 2146 | ) |
| 2147 | #endif |
| 2148 | png_chunk_error(png_ptr, "unknown critical chunk"); |
| 2149 | } |
| 2150 | |
| 2151 | #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) |
| 2152 | if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) |
| 2153 | { |
| 2154 | png_unknown_chunk chunk; |
| 2155 | |
| 2156 | #ifdef PNG_MAX_MALLOC_64K |
| 2157 | if (length > (png_uint_32)65535L) |
| 2158 | { |
| 2159 | png_warning(png_ptr, "unknown chunk too large to fit in memory"); |
| 2160 | skip = length - (png_uint_32)65535L; |
| 2161 | length = (png_uint_32)65535L; |
| 2162 | } |
| 2163 | #endif |
| 2164 | png_strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name); |
| 2165 | chunk.data = (png_bytep)png_malloc(png_ptr, length); |
| 2166 | chunk.size = (png_size_t)length; |
| 2167 | png_crc_read(png_ptr, (png_bytep)chunk.data, length); |
| 2168 | #if defined(PNG_READ_USER_CHUNKS_SUPPORTED) |
| 2169 | if(png_ptr->read_user_chunk_fn != NULL) |
| 2170 | { |
| 2171 | /* callback to user unknown chunk handler */ |
| 2172 | if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0) |
| 2173 | { |
| 2174 | if (!(png_ptr->chunk_name[0] & 0x20)) |
| 2175 | if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != |
| 2176 | HANDLE_CHUNK_ALWAYS) |
| 2177 | { |
| 2178 | png_free(png_ptr, chunk.data); |
| 2179 | png_chunk_error(png_ptr, "unknown critical chunk"); |
| 2180 | } |
| 2181 | png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1); |
| 2182 | } |
| 2183 | } |
| 2184 | else |
| 2185 | #endif |
| 2186 | png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1); |
| 2187 | png_free(png_ptr, chunk.data); |
| 2188 | } |
| 2189 | else |
| 2190 | #endif |
| 2191 | skip = length; |
| 2192 | |
| 2193 | png_crc_finish(png_ptr, skip); |
| 2194 | |
| 2195 | #if !defined(PNG_READ_USER_CHUNKS_SUPPORTED) |
| 2196 | info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */ |
| 2197 | #endif |
| 2198 | } |
| 2199 | |
| 2200 | /* This function is called to verify that a chunk name is valid. |
| 2201 | This function can't have the "critical chunk check" incorporated |
| 2202 | into it, since in the future we will need to be able to call user |
| 2203 | functions to handle unknown critical chunks after we check that |
| 2204 | the chunk name itself is valid. */ |
| 2205 | |
| 2206 | #define isnonalpha(c) ((c) < 41 || (c) > 122 || ((c) > 90 && (c) < 97)) |
| 2207 | |
| 2208 | void /* PRIVATE */ |
| 2209 | png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name) |
| 2210 | { |
| 2211 | png_debug(1, "in png_check_chunk_name\n"); |
| 2212 | if (isnonalpha(chunk_name[0]) || isnonalpha(chunk_name[1]) || |
| 2213 | isnonalpha(chunk_name[2]) || isnonalpha(chunk_name[3])) |
| 2214 | { |
| 2215 | png_chunk_error(png_ptr, "invalid chunk type"); |
| 2216 | } |
| 2217 | } |
| 2218 | |
| 2219 | /* Combines the row recently read in with the existing pixels in the |
| 2220 | row. This routine takes care of alpha and transparency if requested. |
| 2221 | This routine also handles the two methods of progressive display |
| 2222 | of interlaced images, depending on the mask value. |
| 2223 | The mask value describes which pixels are to be combined with |
| 2224 | the row. The pattern always repeats every 8 pixels, so just 8 |
| 2225 | bits are needed. A one indicates the pixel is to be combined, |
| 2226 | a zero indicates the pixel is to be skipped. This is in addition |
| 2227 | to any alpha or transparency value associated with the pixel. If |
| 2228 | you want all pixels to be combined, pass 0xff (255) in mask. */ |
| 2229 | #ifndef PNG_HAVE_ASSEMBLER_COMBINE_ROW |
| 2230 | void /* PRIVATE */ |
| 2231 | png_combine_row(png_structp png_ptr, png_bytep row, int mask) |
| 2232 | { |
| 2233 | png_debug(1,"in png_combine_row\n"); |
| 2234 | if (mask == 0xff) |
| 2235 | { |
| 2236 | png_memcpy(row, png_ptr->row_buf + 1, |
| 2237 | (png_size_t)((png_ptr->width * |
| 2238 | png_ptr->row_info.pixel_depth + 7) >> 3)); |
| 2239 | } |
| 2240 | else |
| 2241 | { |
| 2242 | switch (png_ptr->row_info.pixel_depth) |
| 2243 | { |
| 2244 | case 1: |
| 2245 | { |
| 2246 | png_bytep sp = png_ptr->row_buf + 1; |
| 2247 | png_bytep dp = row; |
| 2248 | int s_inc, s_start, s_end; |
| 2249 | int m = 0x80; |
| 2250 | int shift; |
| 2251 | png_uint_32 i; |
| 2252 | png_uint_32 row_width = png_ptr->width; |
| 2253 | |
| 2254 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) |
| 2255 | if (png_ptr->transformations & PNG_PACKSWAP) |
| 2256 | { |
| 2257 | s_start = 0; |
| 2258 | s_end = 7; |
| 2259 | s_inc = 1; |
| 2260 | } |
| 2261 | else |
| 2262 | #endif |
| 2263 | { |
| 2264 | s_start = 7; |
| 2265 | s_end = 0; |
| 2266 | s_inc = -1; |
| 2267 | } |
| 2268 | |
| 2269 | shift = s_start; |
| 2270 | |
| 2271 | for (i = 0; i < row_width; i++) |
| 2272 | { |
| 2273 | if (m & mask) |
| 2274 | { |
| 2275 | int value; |
| 2276 | |
| 2277 | value = (*sp >> shift) & 0x01; |
| 2278 | *dp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff); |
| 2279 | *dp |= (png_byte)(value << shift); |
| 2280 | } |
| 2281 | |
| 2282 | if (shift == s_end) |
| 2283 | { |
| 2284 | shift = s_start; |
| 2285 | sp++; |
| 2286 | dp++; |
| 2287 | } |
| 2288 | else |
| 2289 | shift += s_inc; |
| 2290 | |
| 2291 | if (m == 1) |
| 2292 | m = 0x80; |
| 2293 | else |
| 2294 | m >>= 1; |
| 2295 | } |
| 2296 | break; |
| 2297 | } |
| 2298 | case 2: |
| 2299 | { |
| 2300 | png_bytep sp = png_ptr->row_buf + 1; |
| 2301 | png_bytep dp = row; |
| 2302 | int s_start, s_end, s_inc; |
| 2303 | int m = 0x80; |
| 2304 | int shift; |
| 2305 | png_uint_32 i; |
| 2306 | png_uint_32 row_width = png_ptr->width; |
| 2307 | int value; |
| 2308 | |
| 2309 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) |
| 2310 | if (png_ptr->transformations & PNG_PACKSWAP) |
| 2311 | { |
| 2312 | s_start = 0; |
| 2313 | s_end = 6; |
| 2314 | s_inc = 2; |
| 2315 | } |
| 2316 | else |
| 2317 | #endif |
| 2318 | { |
| 2319 | s_start = 6; |
| 2320 | s_end = 0; |
| 2321 | s_inc = -2; |
| 2322 | } |
| 2323 | |
| 2324 | shift = s_start; |
| 2325 | |
| 2326 | for (i = 0; i < row_width; i++) |
| 2327 | { |
| 2328 | if (m & mask) |
| 2329 | { |
| 2330 | value = (*sp >> shift) & 0x03; |
| 2331 | *dp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); |
| 2332 | *dp |= (png_byte)(value << shift); |
| 2333 | } |
| 2334 | |
| 2335 | if (shift == s_end) |
| 2336 | { |
| 2337 | shift = s_start; |
| 2338 | sp++; |
| 2339 | dp++; |
| 2340 | } |
| 2341 | else |
| 2342 | shift += s_inc; |
| 2343 | if (m == 1) |
| 2344 | m = 0x80; |
| 2345 | else |
| 2346 | m >>= 1; |
| 2347 | } |
| 2348 | break; |
| 2349 | } |
| 2350 | case 4: |
| 2351 | { |
| 2352 | png_bytep sp = png_ptr->row_buf + 1; |
| 2353 | png_bytep dp = row; |
| 2354 | int s_start, s_end, s_inc; |
| 2355 | int m = 0x80; |
| 2356 | int shift; |
| 2357 | png_uint_32 i; |
| 2358 | png_uint_32 row_width = png_ptr->width; |
| 2359 | int value; |
| 2360 | |
| 2361 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) |
| 2362 | if (png_ptr->transformations & PNG_PACKSWAP) |
| 2363 | { |
| 2364 | s_start = 0; |
| 2365 | s_end = 4; |
| 2366 | s_inc = 4; |
| 2367 | } |
| 2368 | else |
| 2369 | #endif |
| 2370 | { |
| 2371 | s_start = 4; |
| 2372 | s_end = 0; |
| 2373 | s_inc = -4; |
| 2374 | } |
| 2375 | shift = s_start; |
| 2376 | |
| 2377 | for (i = 0; i < row_width; i++) |
| 2378 | { |
| 2379 | if (m & mask) |
| 2380 | { |
| 2381 | value = (*sp >> shift) & 0xf; |
| 2382 | *dp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); |
| 2383 | *dp |= (png_byte)(value << shift); |
| 2384 | } |
| 2385 | |
| 2386 | if (shift == s_end) |
| 2387 | { |
| 2388 | shift = s_start; |
| 2389 | sp++; |
| 2390 | dp++; |
| 2391 | } |
| 2392 | else |
| 2393 | shift += s_inc; |
| 2394 | if (m == 1) |
| 2395 | m = 0x80; |
| 2396 | else |
| 2397 | m >>= 1; |
| 2398 | } |
| 2399 | break; |
| 2400 | } |
| 2401 | default: |
| 2402 | { |
| 2403 | png_bytep sp = png_ptr->row_buf + 1; |
| 2404 | png_bytep dp = row; |
| 2405 | png_size_t pixel_bytes = (png_ptr->row_info.pixel_depth >> 3); |
| 2406 | png_uint_32 i; |
| 2407 | png_uint_32 row_width = png_ptr->width; |
| 2408 | png_byte m = 0x80; |
| 2409 | |
| 2410 | |
| 2411 | for (i = 0; i < row_width; i++) |
| 2412 | { |
| 2413 | if (m & mask) |
| 2414 | { |
| 2415 | png_memcpy(dp, sp, pixel_bytes); |
| 2416 | } |
| 2417 | |
| 2418 | sp += pixel_bytes; |
| 2419 | dp += pixel_bytes; |
| 2420 | |
| 2421 | if (m == 1) |
| 2422 | m = 0x80; |
| 2423 | else |
| 2424 | m >>= 1; |
| 2425 | } |
| 2426 | break; |
| 2427 | } |
| 2428 | } |
| 2429 | } |
| 2430 | } |
| 2431 | #endif /* !PNG_HAVE_ASSEMBLER_COMBINE_ROW */ |
| 2432 | |
| 2433 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
| 2434 | #ifndef PNG_HAVE_ASSEMBLER_READ_INTERLACE /* else in pngvcrd.c, pnggccrd.c */ |
| 2435 | /* OLD pre-1.0.9 interface: |
| 2436 | void png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass, |
| 2437 | png_uint_32 transformations) |
| 2438 | */ |
| 2439 | void /* PRIVATE */ |
| 2440 | png_do_read_interlace(png_structp png_ptr) |
| 2441 | { |
| 2442 | png_row_infop row_info = &(png_ptr->row_info); |
| 2443 | png_bytep row = png_ptr->row_buf + 1; |
| 2444 | int pass = png_ptr->pass; |
| 2445 | png_uint_32 transformations = png_ptr->transformations; |
| 2446 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 2447 | /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
| 2448 | /* offset to next interlace block */ |
| 2449 | const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
| 2450 | #endif |
| 2451 | |
| 2452 | png_debug(1,"in png_do_read_interlace (stock C version)\n"); |
| 2453 | if (row != NULL && row_info != NULL) |
| 2454 | { |
| 2455 | png_uint_32 final_width; |
| 2456 | |
| 2457 | final_width = row_info->width * png_pass_inc[pass]; |
| 2458 | |
| 2459 | switch (row_info->pixel_depth) |
| 2460 | { |
| 2461 | case 1: |
| 2462 | { |
| 2463 | png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 3); |
| 2464 | png_bytep dp = row + (png_size_t)((final_width - 1) >> 3); |
| 2465 | int sshift, dshift; |
| 2466 | int s_start, s_end, s_inc; |
| 2467 | int jstop = png_pass_inc[pass]; |
| 2468 | png_byte v; |
| 2469 | png_uint_32 i; |
| 2470 | int j; |
| 2471 | |
| 2472 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) |
| 2473 | if (transformations & PNG_PACKSWAP) |
| 2474 | { |
| 2475 | sshift = (int)((row_info->width + 7) & 0x07); |
| 2476 | dshift = (int)((final_width + 7) & 0x07); |
| 2477 | s_start = 7; |
| 2478 | s_end = 0; |
| 2479 | s_inc = -1; |
| 2480 | } |
| 2481 | else |
| 2482 | #endif |
| 2483 | { |
| 2484 | sshift = 7 - (int)((row_info->width + 7) & 0x07); |
| 2485 | dshift = 7 - (int)((final_width + 7) & 0x07); |
| 2486 | s_start = 0; |
| 2487 | s_end = 7; |
| 2488 | s_inc = 1; |
| 2489 | } |
| 2490 | |
| 2491 | for (i = 0; i < row_info->width; i++) |
| 2492 | { |
| 2493 | v = (png_byte)((*sp >> sshift) & 0x01); |
| 2494 | for (j = 0; j < jstop; j++) |
| 2495 | { |
| 2496 | *dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff); |
| 2497 | *dp |= (png_byte)(v << dshift); |
| 2498 | if (dshift == s_end) |
| 2499 | { |
| 2500 | dshift = s_start; |
| 2501 | dp--; |
| 2502 | } |
| 2503 | else |
| 2504 | dshift += s_inc; |
| 2505 | } |
| 2506 | if (sshift == s_end) |
| 2507 | { |
| 2508 | sshift = s_start; |
| 2509 | sp--; |
| 2510 | } |
| 2511 | else |
| 2512 | sshift += s_inc; |
| 2513 | } |
| 2514 | break; |
| 2515 | } |
| 2516 | case 2: |
| 2517 | { |
| 2518 | png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2); |
| 2519 | png_bytep dp = row + (png_uint_32)((final_width - 1) >> 2); |
| 2520 | int sshift, dshift; |
| 2521 | int s_start, s_end, s_inc; |
| 2522 | int jstop = png_pass_inc[pass]; |
| 2523 | png_uint_32 i; |
| 2524 | |
| 2525 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) |
| 2526 | if (transformations & PNG_PACKSWAP) |
| 2527 | { |
| 2528 | sshift = (int)(((row_info->width + 3) & 0x03) << 1); |
| 2529 | dshift = (int)(((final_width + 3) & 0x03) << 1); |
| 2530 | s_start = 6; |
| 2531 | s_end = 0; |
| 2532 | s_inc = -2; |
| 2533 | } |
| 2534 | else |
| 2535 | #endif |
| 2536 | { |
| 2537 | sshift = (int)((3 - ((row_info->width + 3) & 0x03)) << 1); |
| 2538 | dshift = (int)((3 - ((final_width + 3) & 0x03)) << 1); |
| 2539 | s_start = 0; |
| 2540 | s_end = 6; |
| 2541 | s_inc = 2; |
| 2542 | } |
| 2543 | |
| 2544 | for (i = 0; i < row_info->width; i++) |
| 2545 | { |
| 2546 | png_byte v; |
| 2547 | int j; |
| 2548 | |
| 2549 | v = (png_byte)((*sp >> sshift) & 0x03); |
| 2550 | for (j = 0; j < jstop; j++) |
| 2551 | { |
| 2552 | *dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff); |
| 2553 | *dp |= (png_byte)(v << dshift); |
| 2554 | if (dshift == s_end) |
| 2555 | { |
| 2556 | dshift = s_start; |
| 2557 | dp--; |
| 2558 | } |
| 2559 | else |
| 2560 | dshift += s_inc; |
| 2561 | } |
| 2562 | if (sshift == s_end) |
| 2563 | { |
| 2564 | sshift = s_start; |
| 2565 | sp--; |
| 2566 | } |
| 2567 | else |
| 2568 | sshift += s_inc; |
| 2569 | } |
| 2570 | break; |
| 2571 | } |
| 2572 | case 4: |
| 2573 | { |
| 2574 | png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1); |
| 2575 | png_bytep dp = row + (png_size_t)((final_width - 1) >> 1); |
| 2576 | int sshift, dshift; |
| 2577 | int s_start, s_end, s_inc; |
| 2578 | png_uint_32 i; |
| 2579 | int jstop = png_pass_inc[pass]; |
| 2580 | |
| 2581 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) |
| 2582 | if (transformations & PNG_PACKSWAP) |
| 2583 | { |
| 2584 | sshift = (int)(((row_info->width + 1) & 0x01) << 2); |
| 2585 | dshift = (int)(((final_width + 1) & 0x01) << 2); |
| 2586 | s_start = 4; |
| 2587 | s_end = 0; |
| 2588 | s_inc = -4; |
| 2589 | } |
| 2590 | else |
| 2591 | #endif |
| 2592 | { |
| 2593 | sshift = (int)((1 - ((row_info->width + 1) & 0x01)) << 2); |
| 2594 | dshift = (int)((1 - ((final_width + 1) & 0x01)) << 2); |
| 2595 | s_start = 0; |
| 2596 | s_end = 4; |
| 2597 | s_inc = 4; |
| 2598 | } |
| 2599 | |
| 2600 | for (i = 0; i < row_info->width; i++) |
| 2601 | { |
| 2602 | png_byte v = (png_byte)((*sp >> sshift) & 0xf); |
| 2603 | int j; |
| 2604 | |
| 2605 | for (j = 0; j < jstop; j++) |
| 2606 | { |
| 2607 | *dp &= (png_byte)((0xf0f >> (4 - dshift)) & 0xff); |
| 2608 | *dp |= (png_byte)(v << dshift); |
| 2609 | if (dshift == s_end) |
| 2610 | { |
| 2611 | dshift = s_start; |
| 2612 | dp--; |
| 2613 | } |
| 2614 | else |
| 2615 | dshift += s_inc; |
| 2616 | } |
| 2617 | if (sshift == s_end) |
| 2618 | { |
| 2619 | sshift = s_start; |
| 2620 | sp--; |
| 2621 | } |
| 2622 | else |
| 2623 | sshift += s_inc; |
| 2624 | } |
| 2625 | break; |
| 2626 | } |
| 2627 | default: |
| 2628 | { |
| 2629 | png_size_t pixel_bytes = (row_info->pixel_depth >> 3); |
| 2630 | png_bytep sp = row + (png_size_t)(row_info->width - 1) * pixel_bytes; |
| 2631 | png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes; |
| 2632 | |
| 2633 | int jstop = png_pass_inc[pass]; |
| 2634 | png_uint_32 i; |
| 2635 | |
| 2636 | for (i = 0; i < row_info->width; i++) |
| 2637 | { |
| 2638 | png_byte v[8]; |
| 2639 | int j; |
| 2640 | |
| 2641 | png_memcpy(v, sp, pixel_bytes); |
| 2642 | for (j = 0; j < jstop; j++) |
| 2643 | { |
| 2644 | png_memcpy(dp, v, pixel_bytes); |
| 2645 | dp -= pixel_bytes; |
| 2646 | } |
| 2647 | sp -= pixel_bytes; |
| 2648 | } |
| 2649 | break; |
| 2650 | } |
| 2651 | } |
| 2652 | row_info->width = final_width; |
| 2653 | row_info->rowbytes = ((final_width * |
| 2654 | (png_uint_32)row_info->pixel_depth + 7) >> 3); |
| 2655 | } |
| 2656 | #if !defined(PNG_READ_PACKSWAP_SUPPORTED) |
| 2657 | transformations = transformations; /* silence compiler warning */ |
| 2658 | #endif |
| 2659 | } |
| 2660 | #endif /* !PNG_HAVE_ASSEMBLER_READ_INTERLACE */ |
| 2661 | #endif /* PNG_READ_INTERLACING_SUPPORTED */ |
| 2662 | |
| 2663 | #ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW |
| 2664 | void /* PRIVATE */ |
| 2665 | png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row, |
| 2666 | png_bytep prev_row, int filter) |
| 2667 | { |
| 2668 | png_debug(1, "in png_read_filter_row\n"); |
| 2669 | png_debug2(2,"row = %lu, filter = %d\n", png_ptr->row_number, filter); |
| 2670 | switch (filter) |
| 2671 | { |
| 2672 | case PNG_FILTER_VALUE_NONE: |
| 2673 | break; |
| 2674 | case PNG_FILTER_VALUE_SUB: |
| 2675 | { |
| 2676 | png_uint_32 i; |
| 2677 | png_uint_32 istop = row_info->rowbytes; |
| 2678 | png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3; |
| 2679 | png_bytep rp = row + bpp; |
| 2680 | png_bytep lp = row; |
| 2681 | |
| 2682 | for (i = bpp; i < istop; i++) |
| 2683 | { |
| 2684 | *rp = (png_byte)(((int)(*rp) + (int)(*lp++)) & 0xff); |
| 2685 | rp++; |
| 2686 | } |
| 2687 | break; |
| 2688 | } |
| 2689 | case PNG_FILTER_VALUE_UP: |
| 2690 | { |
| 2691 | png_uint_32 i; |
| 2692 | png_uint_32 istop = row_info->rowbytes; |
| 2693 | png_bytep rp = row; |
| 2694 | png_bytep pp = prev_row; |
| 2695 | |
| 2696 | for (i = 0; i < istop; i++) |
| 2697 | { |
| 2698 | *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff); |
| 2699 | rp++; |
| 2700 | } |
| 2701 | break; |
| 2702 | } |
| 2703 | case PNG_FILTER_VALUE_AVG: |
| 2704 | { |
| 2705 | png_uint_32 i; |
| 2706 | png_bytep rp = row; |
| 2707 | png_bytep pp = prev_row; |
| 2708 | png_bytep lp = row; |
| 2709 | png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3; |
| 2710 | png_uint_32 istop = row_info->rowbytes - bpp; |
| 2711 | |
| 2712 | for (i = 0; i < bpp; i++) |
| 2713 | { |
| 2714 | *rp = (png_byte)(((int)(*rp) + |
| 2715 | ((int)(*pp++) / 2 )) & 0xff); |
| 2716 | rp++; |
| 2717 | } |
| 2718 | |
| 2719 | for (i = 0; i < istop; i++) |
| 2720 | { |
| 2721 | *rp = (png_byte)(((int)(*rp) + |
| 2722 | (int)(*pp++ + *lp++) / 2 ) & 0xff); |
| 2723 | rp++; |
| 2724 | } |
| 2725 | break; |
| 2726 | } |
| 2727 | case PNG_FILTER_VALUE_PAETH: |
| 2728 | { |
| 2729 | png_uint_32 i; |
| 2730 | png_bytep rp = row; |
| 2731 | png_bytep pp = prev_row; |
| 2732 | png_bytep lp = row; |
| 2733 | png_bytep cp = prev_row; |
| 2734 | png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3; |
| 2735 | png_uint_32 istop=row_info->rowbytes - bpp; |
| 2736 | |
| 2737 | for (i = 0; i < bpp; i++) |
| 2738 | { |
| 2739 | *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff); |
| 2740 | rp++; |
| 2741 | } |
| 2742 | |
| 2743 | for (i = 0; i < istop; i++) /* use leftover rp,pp */ |
| 2744 | { |
| 2745 | int a, b, c, pa, pb, pc, p; |
| 2746 | |
| 2747 | a = *lp++; |
| 2748 | b = *pp++; |
| 2749 | c = *cp++; |
| 2750 | |
| 2751 | p = b - c; |
| 2752 | pc = a - c; |
| 2753 | |
| 2754 | #ifdef PNG_USE_ABS |
| 2755 | pa = abs(p); |
| 2756 | pb = abs(pc); |
| 2757 | pc = abs(p + pc); |
| 2758 | #else |
| 2759 | pa = p < 0 ? -p : p; |
| 2760 | pb = pc < 0 ? -pc : pc; |
| 2761 | pc = (p + pc) < 0 ? -(p + pc) : p + pc; |
| 2762 | #endif |
| 2763 | |
| 2764 | /* |
| 2765 | if (pa <= pb && pa <= pc) |
| 2766 | p = a; |
| 2767 | else if (pb <= pc) |
| 2768 | p = b; |
| 2769 | else |
| 2770 | p = c; |
| 2771 | */ |
| 2772 | |
| 2773 | p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c; |
| 2774 | |
| 2775 | *rp = (png_byte)(((int)(*rp) + p) & 0xff); |
| 2776 | rp++; |
| 2777 | } |
| 2778 | break; |
| 2779 | } |
| 2780 | default: |
| 2781 | png_warning(png_ptr, "Ignoring bad adaptive filter type"); |
| 2782 | *row=0; |
| 2783 | break; |
| 2784 | } |
| 2785 | } |
| 2786 | #endif /* !PNG_HAVE_ASSEMBLER_READ_FILTER_ROW */ |
| 2787 | |
| 2788 | void /* PRIVATE */ |
| 2789 | png_read_finish_row(png_structp png_ptr) |
| 2790 | { |
| 2791 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 2792 | /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
| 2793 | |
| 2794 | /* start of interlace block */ |
| 2795 | const int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
| 2796 | |
| 2797 | /* offset to next interlace block */ |
| 2798 | const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
| 2799 | |
| 2800 | /* start of interlace block in the y direction */ |
| 2801 | const int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; |
| 2802 | |
| 2803 | /* offset to next interlace block in the y direction */ |
| 2804 | const int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; |
| 2805 | #endif |
| 2806 | |
| 2807 | png_debug(1, "in png_read_finish_row\n"); |
| 2808 | png_ptr->row_number++; |
| 2809 | if (png_ptr->row_number < png_ptr->num_rows) |
| 2810 | return; |
| 2811 | |
| 2812 | if (png_ptr->interlaced) |
| 2813 | { |
| 2814 | png_ptr->row_number = 0; |
| 2815 | png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1); |
| 2816 | do |
| 2817 | { |
| 2818 | png_ptr->pass++; |
| 2819 | if (png_ptr->pass >= 7) |
| 2820 | break; |
| 2821 | png_ptr->iwidth = (png_ptr->width + |
| 2822 | png_pass_inc[png_ptr->pass] - 1 - |
| 2823 | png_pass_start[png_ptr->pass]) / |
| 2824 | png_pass_inc[png_ptr->pass]; |
| 2825 | png_ptr->irowbytes = ((png_ptr->iwidth * |
| 2826 | (png_uint_32)png_ptr->pixel_depth + 7) >> 3) +1; |
| 2827 | |
| 2828 | if (!(png_ptr->transformations & PNG_INTERLACE)) |
| 2829 | { |
| 2830 | png_ptr->num_rows = (png_ptr->height + |
| 2831 | png_pass_yinc[png_ptr->pass] - 1 - |
| 2832 | png_pass_ystart[png_ptr->pass]) / |
| 2833 | png_pass_yinc[png_ptr->pass]; |
| 2834 | if (!(png_ptr->num_rows)) |
| 2835 | continue; |
| 2836 | } |
| 2837 | else /* if (png_ptr->transformations & PNG_INTERLACE) */ |
| 2838 | break; |
| 2839 | } while (png_ptr->iwidth == 0); |
| 2840 | |
| 2841 | if (png_ptr->pass < 7) |
| 2842 | return; |
| 2843 | } |
| 2844 | |
| 2845 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) |
| 2846 | { |
| 2847 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 2848 | PNG_IDAT; |
| 2849 | #endif |
| 2850 | char extra; |
| 2851 | int ret; |
| 2852 | |
| 2853 | png_ptr->zstream.next_out = (Byte *)&extra; |
| 2854 | png_ptr->zstream.avail_out = (uInt)1; |
| 2855 | for(;;) |
| 2856 | { |
| 2857 | if (!(png_ptr->zstream.avail_in)) |
| 2858 | { |
| 2859 | while (!png_ptr->idat_size) |
| 2860 | { |
| 2861 | png_byte chunk_length[4]; |
| 2862 | |
| 2863 | png_crc_finish(png_ptr, 0); |
| 2864 | |
| 2865 | png_read_data(png_ptr, chunk_length, 4); |
| 2866 | png_ptr->idat_size = png_get_uint_32(chunk_length); |
| 2867 | |
| 2868 | png_reset_crc(png_ptr); |
| 2869 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
| 2870 | if (png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4)) |
| 2871 | png_error(png_ptr, "Not enough image data"); |
| 2872 | |
| 2873 | } |
| 2874 | png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; |
| 2875 | png_ptr->zstream.next_in = png_ptr->zbuf; |
| 2876 | if (png_ptr->zbuf_size > png_ptr->idat_size) |
| 2877 | png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; |
| 2878 | png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zstream.avail_in); |
| 2879 | png_ptr->idat_size -= png_ptr->zstream.avail_in; |
| 2880 | } |
| 2881 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
| 2882 | if (ret == Z_STREAM_END) |
| 2883 | { |
| 2884 | if (!(png_ptr->zstream.avail_out) || png_ptr->zstream.avail_in || |
| 2885 | png_ptr->idat_size) |
| 2886 | png_warning(png_ptr, "Extra compressed data"); |
| 2887 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 2888 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| 2889 | break; |
| 2890 | } |
| 2891 | if (ret != Z_OK) |
| 2892 | png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : |
| 2893 | "Decompression Error"); |
| 2894 | |
| 2895 | if (!(png_ptr->zstream.avail_out)) |
| 2896 | { |
| 2897 | png_warning(png_ptr, "Extra compressed data."); |
| 2898 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 2899 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| 2900 | break; |
| 2901 | } |
| 2902 | |
| 2903 | } |
| 2904 | png_ptr->zstream.avail_out = 0; |
| 2905 | } |
| 2906 | |
| 2907 | if (png_ptr->idat_size || png_ptr->zstream.avail_in) |
| 2908 | png_warning(png_ptr, "Extra compression data"); |
| 2909 | |
| 2910 | inflateReset(&png_ptr->zstream); |
| 2911 | |
| 2912 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 2913 | } |
| 2914 | |
| 2915 | void /* PRIVATE */ |
| 2916 | png_read_start_row(png_structp png_ptr) |
| 2917 | { |
| 2918 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 2919 | /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
| 2920 | |
| 2921 | /* start of interlace block */ |
| 2922 | const int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
| 2923 | |
| 2924 | /* offset to next interlace block */ |
| 2925 | const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
| 2926 | |
| 2927 | /* start of interlace block in the y direction */ |
| 2928 | const int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; |
| 2929 | |
| 2930 | /* offset to next interlace block in the y direction */ |
| 2931 | const int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; |
| 2932 | #endif |
| 2933 | |
| 2934 | int max_pixel_depth; |
| 2935 | png_uint_32 row_bytes; |
| 2936 | |
| 2937 | png_debug(1, "in png_read_start_row\n"); |
| 2938 | png_ptr->zstream.avail_in = 0; |
| 2939 | png_init_read_transformations(png_ptr); |
| 2940 | if (png_ptr->interlaced) |
| 2941 | { |
| 2942 | if (!(png_ptr->transformations & PNG_INTERLACE)) |
| 2943 | png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 - |
| 2944 | png_pass_ystart[0]) / png_pass_yinc[0]; |
| 2945 | else |
| 2946 | png_ptr->num_rows = png_ptr->height; |
| 2947 | |
| 2948 | png_ptr->iwidth = (png_ptr->width + |
| 2949 | png_pass_inc[png_ptr->pass] - 1 - |
| 2950 | png_pass_start[png_ptr->pass]) / |
| 2951 | png_pass_inc[png_ptr->pass]; |
| 2952 | |
| 2953 | row_bytes = ((png_ptr->iwidth * |
| 2954 | (png_uint_32)png_ptr->pixel_depth + 7) >> 3) +1; |
| 2955 | png_ptr->irowbytes = (png_size_t)row_bytes; |
| 2956 | if((png_uint_32)png_ptr->irowbytes != row_bytes) |
| 2957 | png_error(png_ptr, "Rowbytes overflow in png_read_start_row"); |
| 2958 | } |
| 2959 | else |
| 2960 | { |
| 2961 | png_ptr->num_rows = png_ptr->height; |
| 2962 | png_ptr->iwidth = png_ptr->width; |
| 2963 | png_ptr->irowbytes = png_ptr->rowbytes + 1; |
| 2964 | } |
| 2965 | max_pixel_depth = png_ptr->pixel_depth; |
| 2966 | |
| 2967 | #if defined(PNG_READ_PACK_SUPPORTED) |
| 2968 | if ((png_ptr->transformations & PNG_PACK) && png_ptr->bit_depth < 8) |
| 2969 | max_pixel_depth = 8; |
| 2970 | #endif |
| 2971 | |
| 2972 | #if defined(PNG_READ_EXPAND_SUPPORTED) |
| 2973 | if (png_ptr->transformations & PNG_EXPAND) |
| 2974 | { |
| 2975 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 2976 | { |
| 2977 | if (png_ptr->num_trans) |
| 2978 | max_pixel_depth = 32; |
| 2979 | else |
| 2980 | max_pixel_depth = 24; |
| 2981 | } |
| 2982 | else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) |
| 2983 | { |
| 2984 | if (max_pixel_depth < 8) |
| 2985 | max_pixel_depth = 8; |
| 2986 | if (png_ptr->num_trans) |
| 2987 | max_pixel_depth *= 2; |
| 2988 | } |
| 2989 | else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) |
| 2990 | { |
| 2991 | if (png_ptr->num_trans) |
| 2992 | { |
| 2993 | max_pixel_depth *= 4; |
| 2994 | max_pixel_depth /= 3; |
| 2995 | } |
| 2996 | } |
| 2997 | } |
| 2998 | #endif |
| 2999 | |
| 3000 | #if defined(PNG_READ_FILLER_SUPPORTED) |
| 3001 | if (png_ptr->transformations & (PNG_FILLER)) |
| 3002 | { |
| 3003 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 3004 | max_pixel_depth = 32; |
| 3005 | else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) |
| 3006 | { |
| 3007 | if (max_pixel_depth <= 8) |
| 3008 | max_pixel_depth = 16; |
| 3009 | else |
| 3010 | max_pixel_depth = 32; |
| 3011 | } |
| 3012 | else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) |
| 3013 | { |
| 3014 | if (max_pixel_depth <= 32) |
| 3015 | max_pixel_depth = 32; |
| 3016 | else |
| 3017 | max_pixel_depth = 64; |
| 3018 | } |
| 3019 | } |
| 3020 | #endif |
| 3021 | |
| 3022 | #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) |
| 3023 | if (png_ptr->transformations & PNG_GRAY_TO_RGB) |
| 3024 | { |
| 3025 | if ( |
| 3026 | #if defined(PNG_READ_EXPAND_SUPPORTED) |
| 3027 | (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) || |
| 3028 | #endif |
| 3029 | #if defined(PNG_READ_FILLER_SUPPORTED) |
| 3030 | (png_ptr->transformations & (PNG_FILLER)) || |
| 3031 | #endif |
| 3032 | png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
| 3033 | { |
| 3034 | if (max_pixel_depth <= 16) |
| 3035 | max_pixel_depth = 32; |
| 3036 | else |
| 3037 | max_pixel_depth = 64; |
| 3038 | } |
| 3039 | else |
| 3040 | { |
| 3041 | if (max_pixel_depth <= 8) |
| 3042 | { |
| 3043 | if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 3044 | max_pixel_depth = 32; |
| 3045 | else |
| 3046 | max_pixel_depth = 24; |
| 3047 | } |
| 3048 | else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 3049 | max_pixel_depth = 64; |
| 3050 | else |
| 3051 | max_pixel_depth = 48; |
| 3052 | } |
| 3053 | } |
| 3054 | #endif |
| 3055 | |
| 3056 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) && \ |
| 3057 | defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) |
| 3058 | if(png_ptr->transformations & PNG_USER_TRANSFORM) |
| 3059 | { |
| 3060 | int user_pixel_depth=png_ptr->user_transform_depth* |
| 3061 | png_ptr->user_transform_channels; |
| 3062 | if(user_pixel_depth > max_pixel_depth) |
| 3063 | max_pixel_depth=user_pixel_depth; |
| 3064 | } |
| 3065 | #endif |
| 3066 | |
| 3067 | /* align the width on the next larger 8 pixels. Mainly used |
| 3068 | for interlacing */ |
| 3069 | row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7)); |
| 3070 | /* calculate the maximum bytes needed, adding a byte and a pixel |
| 3071 | for safety's sake */ |
| 3072 | row_bytes = ((row_bytes * (png_uint_32)max_pixel_depth + 7) >> 3) + |
| 3073 | 1 + ((max_pixel_depth + 7) >> 3); |
| 3074 | #ifdef PNG_MAX_MALLOC_64K |
| 3075 | if (row_bytes > (png_uint_32)65536L) |
| 3076 | png_error(png_ptr, "This image requires a row greater than 64KB"); |
| 3077 | #endif |
| 3078 | png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes+64); |
| 3079 | png_ptr->row_buf = png_ptr->big_row_buf+32; |
| 3080 | #if defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD) |
| 3081 | png_ptr->row_buf_size = row_bytes; |
| 3082 | #endif |
| 3083 | |
| 3084 | #ifdef PNG_MAX_MALLOC_64K |
| 3085 | if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L) |
| 3086 | png_error(png_ptr, "This image requires a row greater than 64KB"); |
| 3087 | #endif |
| 3088 | png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)( |
| 3089 | png_ptr->rowbytes + 1)); |
| 3090 | |
| 3091 | png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1); |
| 3092 | |
| 3093 | png_debug1(3, "width = %lu,\n", png_ptr->width); |
| 3094 | png_debug1(3, "height = %lu,\n", png_ptr->height); |
| 3095 | png_debug1(3, "iwidth = %lu,\n", png_ptr->iwidth); |
| 3096 | png_debug1(3, "num_rows = %lu\n", png_ptr->num_rows); |
| 3097 | png_debug1(3, "rowbytes = %lu,\n", png_ptr->rowbytes); |
| 3098 | png_debug1(3, "irowbytes = %lu,\n", png_ptr->irowbytes); |
| 3099 | |
| 3100 | png_ptr->flags |= PNG_FLAG_ROW_INIT; |
| 3101 | } |