| 1 | |
| 2 | /* pngpread.c - read a png file in push mode |
| 3 | * |
| 4 | * libpng 1.0.3 - January 14, 1999 |
| 5 | * For conditions of distribution and use, see copyright notice in png.h |
| 6 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
| 7 | * Copyright (c) 1996, 1997 Andreas Dilger |
| 8 | * Copyright (c) 1998, 1999 Glenn Randers-Pehrson |
| 9 | */ |
| 10 | |
| 11 | #define PNG_INTERNAL |
| 12 | #include "png.h" |
| 13 | |
| 14 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 15 | |
| 16 | void |
| 17 | png_process_data(png_structp png_ptr, png_infop info_ptr, |
| 18 | png_bytep buffer, png_size_t buffer_size) |
| 19 | { |
| 20 | png_push_restore_buffer(png_ptr, buffer, buffer_size); |
| 21 | |
| 22 | while (png_ptr->buffer_size) |
| 23 | { |
| 24 | png_process_some_data(png_ptr, info_ptr); |
| 25 | } |
| 26 | } |
| 27 | |
| 28 | /* What we do with the incoming data depends on what we were previously |
| 29 | * doing before we ran out of data... |
| 30 | */ |
| 31 | void |
| 32 | png_process_some_data(png_structp png_ptr, png_infop info_ptr) |
| 33 | { |
| 34 | switch (png_ptr->process_mode) |
| 35 | { |
| 36 | case PNG_READ_SIG_MODE: |
| 37 | { |
| 38 | png_push_read_sig(png_ptr, info_ptr); |
| 39 | break; |
| 40 | } |
| 41 | case PNG_READ_CHUNK_MODE: |
| 42 | { |
| 43 | png_push_read_chunk(png_ptr, info_ptr); |
| 44 | break; |
| 45 | } |
| 46 | case PNG_READ_IDAT_MODE: |
| 47 | { |
| 48 | png_push_read_IDAT(png_ptr); |
| 49 | break; |
| 50 | } |
| 51 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 52 | case PNG_READ_tEXt_MODE: |
| 53 | { |
| 54 | png_push_read_tEXt(png_ptr, info_ptr); |
| 55 | break; |
| 56 | } |
| 57 | #endif |
| 58 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 59 | case PNG_READ_zTXt_MODE: |
| 60 | { |
| 61 | png_push_read_zTXt(png_ptr, info_ptr); |
| 62 | break; |
| 63 | } |
| 64 | #endif |
| 65 | case PNG_SKIP_MODE: |
| 66 | { |
| 67 | png_push_crc_finish(png_ptr); |
| 68 | break; |
| 69 | } |
| 70 | default: |
| 71 | { |
| 72 | png_ptr->buffer_size = 0; |
| 73 | break; |
| 74 | } |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | /* Read any remaining signature bytes from the stream and compare them with |
| 79 | * the correct PNG signature. It is possible that this routine is called |
| 80 | * with bytes already read from the signature, either because they have been |
| 81 | * checked by the calling application, or because of multiple calls to this |
| 82 | * routine. |
| 83 | */ |
| 84 | void |
| 85 | png_push_read_sig(png_structp png_ptr, png_infop info_ptr) |
| 86 | { |
| 87 | png_size_t num_checked = png_ptr->sig_bytes, |
| 88 | num_to_check = 8 - num_checked; |
| 89 | |
| 90 | if (png_ptr->buffer_size < num_to_check) |
| 91 | { |
| 92 | num_to_check = png_ptr->buffer_size; |
| 93 | } |
| 94 | |
| 95 | png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]), |
| 96 | num_to_check); |
| 97 | png_ptr->sig_bytes += num_to_check; |
| 98 | |
| 99 | if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) |
| 100 | { |
| 101 | if (num_checked < 4 && |
| 102 | png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) |
| 103 | png_error(png_ptr, "Not a PNG file"); |
| 104 | else |
| 105 | png_error(png_ptr, "PNG file corrupted by ASCII conversion"); |
| 106 | } |
| 107 | else |
| 108 | { |
| 109 | if (png_ptr->sig_bytes >= 8) |
| 110 | { |
| 111 | png_ptr->process_mode = PNG_READ_CHUNK_MODE; |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | void |
| 117 | png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) |
| 118 | { |
| 119 | /* First we make sure we have enough data for the 4 byte chunk name |
| 120 | * and the 4 byte chunk length before proceeding with decoding the |
| 121 | * chunk data. To fully decode each of these chunks, we also make |
| 122 | * sure we have enough data in the buffer for the 4 byte CRC at the |
| 123 | * end of every chunk (except IDAT, which is handled separately). |
| 124 | */ |
| 125 | if (!(png_ptr->flags & PNG_FLAG_HAVE_CHUNK_HEADER)) |
| 126 | { |
| 127 | png_byte chunk_length[4]; |
| 128 | |
| 129 | if (png_ptr->buffer_size < 8) |
| 130 | { |
| 131 | png_push_save_buffer(png_ptr); |
| 132 | return; |
| 133 | } |
| 134 | |
| 135 | png_push_fill_buffer(png_ptr, chunk_length, 4); |
| 136 | png_ptr->push_length = png_get_uint_32(chunk_length); |
| 137 | png_reset_crc(png_ptr); |
| 138 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
| 139 | png_ptr->flags |= PNG_FLAG_HAVE_CHUNK_HEADER; |
| 140 | } |
| 141 | |
| 142 | if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) |
| 143 | { |
| 144 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 145 | { |
| 146 | png_push_save_buffer(png_ptr); |
| 147 | return; |
| 148 | } |
| 149 | |
| 150 | png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length); |
| 151 | } |
| 152 | else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
| 153 | { |
| 154 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 155 | { |
| 156 | png_push_save_buffer(png_ptr); |
| 157 | return; |
| 158 | } |
| 159 | |
| 160 | png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length); |
| 161 | } |
| 162 | else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 163 | { |
| 164 | /* If we reach an IDAT chunk, this means we have read all of the |
| 165 | * header chunks, and we can start reading the image (or if this |
| 166 | * is called after the image has been read - we have an error). |
| 167 | */ |
| 168 | if (png_ptr->mode & PNG_HAVE_IDAT) |
| 169 | { |
| 170 | if (png_ptr->push_length == 0) |
| 171 | return; |
| 172 | |
| 173 | if (png_ptr->mode & PNG_AFTER_IDAT) |
| 174 | png_error(png_ptr, "Too many IDAT's found"); |
| 175 | } |
| 176 | |
| 177 | png_ptr->idat_size = png_ptr->push_length; |
| 178 | png_ptr->mode |= PNG_HAVE_IDAT; |
| 179 | png_ptr->process_mode = PNG_READ_IDAT_MODE; |
| 180 | png_push_have_info(png_ptr, info_ptr); |
| 181 | png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes; |
| 182 | png_ptr->zstream.next_out = png_ptr->row_buf; |
| 183 | return; |
| 184 | } |
| 185 | else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) |
| 186 | { |
| 187 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 188 | { |
| 189 | png_push_save_buffer(png_ptr); |
| 190 | return; |
| 191 | } |
| 192 | |
| 193 | png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length); |
| 194 | png_ptr->process_mode = PNG_READ_DONE_MODE; |
| 195 | png_push_have_end(png_ptr, info_ptr); |
| 196 | } |
| 197 | #if defined(PNG_READ_gAMA_SUPPORTED) |
| 198 | else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) |
| 199 | { |
| 200 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 201 | { |
| 202 | png_push_save_buffer(png_ptr); |
| 203 | return; |
| 204 | } |
| 205 | |
| 206 | png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length); |
| 207 | } |
| 208 | #endif |
| 209 | #if defined(PNG_READ_sBIT_SUPPORTED) |
| 210 | else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) |
| 211 | { |
| 212 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 213 | { |
| 214 | png_push_save_buffer(png_ptr); |
| 215 | return; |
| 216 | } |
| 217 | |
| 218 | png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length); |
| 219 | } |
| 220 | #endif |
| 221 | #if defined(PNG_READ_cHRM_SUPPORTED) |
| 222 | else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) |
| 223 | { |
| 224 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 225 | { |
| 226 | png_push_save_buffer(png_ptr); |
| 227 | return; |
| 228 | } |
| 229 | |
| 230 | png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length); |
| 231 | } |
| 232 | #endif |
| 233 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 234 | else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) |
| 235 | { |
| 236 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 237 | { |
| 238 | png_push_save_buffer(png_ptr); |
| 239 | return; |
| 240 | } |
| 241 | |
| 242 | png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length); |
| 243 | } |
| 244 | #endif |
| 245 | #if defined(PNG_READ_tRNS_SUPPORTED) |
| 246 | else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) |
| 247 | { |
| 248 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 249 | { |
| 250 | png_push_save_buffer(png_ptr); |
| 251 | return; |
| 252 | } |
| 253 | |
| 254 | png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length); |
| 255 | } |
| 256 | #endif |
| 257 | #if defined(PNG_READ_bKGD_SUPPORTED) |
| 258 | else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) |
| 259 | { |
| 260 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 261 | { |
| 262 | png_push_save_buffer(png_ptr); |
| 263 | return; |
| 264 | } |
| 265 | |
| 266 | png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length); |
| 267 | } |
| 268 | #endif |
| 269 | #if defined(PNG_READ_hIST_SUPPORTED) |
| 270 | else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) |
| 271 | { |
| 272 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 273 | { |
| 274 | png_push_save_buffer(png_ptr); |
| 275 | return; |
| 276 | } |
| 277 | |
| 278 | png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length); |
| 279 | } |
| 280 | #endif |
| 281 | #if defined(PNG_READ_pHYs_SUPPORTED) |
| 282 | else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) |
| 283 | { |
| 284 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 285 | { |
| 286 | png_push_save_buffer(png_ptr); |
| 287 | return; |
| 288 | } |
| 289 | |
| 290 | png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length); |
| 291 | } |
| 292 | #endif |
| 293 | #if defined(PNG_READ_oFFs_SUPPORTED) |
| 294 | else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) |
| 295 | { |
| 296 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 297 | { |
| 298 | png_push_save_buffer(png_ptr); |
| 299 | return; |
| 300 | } |
| 301 | |
| 302 | png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length); |
| 303 | } |
| 304 | #endif |
| 305 | #if defined(PNG_READ_pCAL_SUPPORTED) |
| 306 | else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) |
| 307 | { |
| 308 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 309 | { |
| 310 | png_push_save_buffer(png_ptr); |
| 311 | return; |
| 312 | } |
| 313 | |
| 314 | png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length); |
| 315 | } |
| 316 | #endif |
| 317 | #if defined(PNG_READ_tIME_SUPPORTED) |
| 318 | else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) |
| 319 | { |
| 320 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 321 | { |
| 322 | png_push_save_buffer(png_ptr); |
| 323 | return; |
| 324 | } |
| 325 | |
| 326 | png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length); |
| 327 | } |
| 328 | #endif |
| 329 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 330 | else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) |
| 331 | { |
| 332 | png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length); |
| 333 | } |
| 334 | #endif |
| 335 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 336 | else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) |
| 337 | { |
| 338 | png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length); |
| 339 | } |
| 340 | #endif |
| 341 | else |
| 342 | { |
| 343 | png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); |
| 344 | } |
| 345 | |
| 346 | png_ptr->flags &= ~PNG_FLAG_HAVE_CHUNK_HEADER; |
| 347 | } |
| 348 | |
| 349 | void |
| 350 | png_push_crc_skip(png_structp png_ptr, png_uint_32 skip) |
| 351 | { |
| 352 | png_ptr->process_mode = PNG_SKIP_MODE; |
| 353 | png_ptr->skip_length = skip; |
| 354 | } |
| 355 | |
| 356 | void |
| 357 | png_push_crc_finish(png_structp png_ptr) |
| 358 | { |
| 359 | if (png_ptr->skip_length && png_ptr->save_buffer_size) |
| 360 | { |
| 361 | png_size_t save_size; |
| 362 | |
| 363 | if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size) |
| 364 | save_size = (png_size_t)png_ptr->skip_length; |
| 365 | else |
| 366 | save_size = png_ptr->save_buffer_size; |
| 367 | |
| 368 | png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); |
| 369 | |
| 370 | png_ptr->skip_length -= save_size; |
| 371 | png_ptr->buffer_size -= save_size; |
| 372 | png_ptr->save_buffer_size -= save_size; |
| 373 | png_ptr->save_buffer_ptr += save_size; |
| 374 | } |
| 375 | if (png_ptr->skip_length && png_ptr->current_buffer_size) |
| 376 | { |
| 377 | png_size_t save_size; |
| 378 | |
| 379 | if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size) |
| 380 | save_size = (png_size_t)png_ptr->skip_length; |
| 381 | else |
| 382 | save_size = png_ptr->current_buffer_size; |
| 383 | |
| 384 | png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); |
| 385 | |
| 386 | png_ptr->skip_length -= save_size; |
| 387 | png_ptr->buffer_size -= save_size; |
| 388 | png_ptr->current_buffer_size -= save_size; |
| 389 | png_ptr->current_buffer_ptr += save_size; |
| 390 | } |
| 391 | if (!png_ptr->skip_length) |
| 392 | { |
| 393 | if (png_ptr->buffer_size < 4) |
| 394 | { |
| 395 | png_push_save_buffer(png_ptr); |
| 396 | return; |
| 397 | } |
| 398 | |
| 399 | png_crc_finish(png_ptr, 0); |
| 400 | png_ptr->process_mode = PNG_READ_CHUNK_MODE; |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | void |
| 405 | png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length) |
| 406 | { |
| 407 | png_bytep ptr; |
| 408 | |
| 409 | ptr = buffer; |
| 410 | if (png_ptr->save_buffer_size) |
| 411 | { |
| 412 | png_size_t save_size; |
| 413 | |
| 414 | if (length < png_ptr->save_buffer_size) |
| 415 | save_size = length; |
| 416 | else |
| 417 | save_size = png_ptr->save_buffer_size; |
| 418 | |
| 419 | png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size); |
| 420 | length -= save_size; |
| 421 | ptr += save_size; |
| 422 | png_ptr->buffer_size -= save_size; |
| 423 | png_ptr->save_buffer_size -= save_size; |
| 424 | png_ptr->save_buffer_ptr += save_size; |
| 425 | } |
| 426 | if (length && png_ptr->current_buffer_size) |
| 427 | { |
| 428 | png_size_t save_size; |
| 429 | |
| 430 | if (length < png_ptr->current_buffer_size) |
| 431 | save_size = length; |
| 432 | else |
| 433 | save_size = png_ptr->current_buffer_size; |
| 434 | |
| 435 | png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size); |
| 436 | png_ptr->buffer_size -= save_size; |
| 437 | png_ptr->current_buffer_size -= save_size; |
| 438 | png_ptr->current_buffer_ptr += save_size; |
| 439 | } |
| 440 | } |
| 441 | |
| 442 | void |
| 443 | png_push_save_buffer(png_structp png_ptr) |
| 444 | { |
| 445 | if (png_ptr->save_buffer_size) |
| 446 | { |
| 447 | if (png_ptr->save_buffer_ptr != png_ptr->save_buffer) |
| 448 | { |
| 449 | png_size_t i,istop; |
| 450 | png_bytep sp; |
| 451 | png_bytep dp; |
| 452 | |
| 453 | istop = png_ptr->save_buffer_size; |
| 454 | for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer; |
| 455 | i < istop; i++, sp++, dp++) |
| 456 | { |
| 457 | *dp = *sp; |
| 458 | } |
| 459 | } |
| 460 | } |
| 461 | if (png_ptr->save_buffer_size + png_ptr->current_buffer_size > |
| 462 | png_ptr->save_buffer_max) |
| 463 | { |
| 464 | png_size_t new_max; |
| 465 | png_bytep old_buffer; |
| 466 | |
| 467 | new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256; |
| 468 | old_buffer = png_ptr->save_buffer; |
| 469 | png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr, |
| 470 | (png_uint_32)new_max); |
| 471 | png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size); |
| 472 | png_free(png_ptr, old_buffer); |
| 473 | png_ptr->save_buffer_max = new_max; |
| 474 | } |
| 475 | if (png_ptr->current_buffer_size) |
| 476 | { |
| 477 | png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size, |
| 478 | png_ptr->current_buffer_ptr, png_ptr->current_buffer_size); |
| 479 | png_ptr->save_buffer_size += png_ptr->current_buffer_size; |
| 480 | png_ptr->current_buffer_size = 0; |
| 481 | } |
| 482 | png_ptr->save_buffer_ptr = png_ptr->save_buffer; |
| 483 | png_ptr->buffer_size = 0; |
| 484 | } |
| 485 | |
| 486 | void |
| 487 | png_push_restore_buffer(png_structp png_ptr, png_bytep buffer, |
| 488 | png_size_t buffer_length) |
| 489 | { |
| 490 | png_ptr->current_buffer = buffer; |
| 491 | png_ptr->current_buffer_size = buffer_length; |
| 492 | png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size; |
| 493 | png_ptr->current_buffer_ptr = png_ptr->current_buffer; |
| 494 | } |
| 495 | |
| 496 | void |
| 497 | png_push_read_IDAT(png_structp png_ptr) |
| 498 | { |
| 499 | if (!(png_ptr->flags & PNG_FLAG_HAVE_CHUNK_HEADER)) |
| 500 | { |
| 501 | png_byte chunk_length[4]; |
| 502 | |
| 503 | if (png_ptr->buffer_size < 8) |
| 504 | { |
| 505 | png_push_save_buffer(png_ptr); |
| 506 | return; |
| 507 | } |
| 508 | |
| 509 | png_push_fill_buffer(png_ptr, chunk_length, 4); |
| 510 | png_ptr->push_length = png_get_uint_32(chunk_length); |
| 511 | |
| 512 | png_reset_crc(png_ptr); |
| 513 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
| 514 | png_ptr->flags |= PNG_FLAG_HAVE_CHUNK_HEADER; |
| 515 | |
| 516 | if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 517 | { |
| 518 | png_ptr->process_mode = PNG_READ_CHUNK_MODE; |
| 519 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) |
| 520 | png_error(png_ptr, "Not enough compressed data"); |
| 521 | return; |
| 522 | } |
| 523 | |
| 524 | png_ptr->idat_size = png_ptr->push_length; |
| 525 | } |
| 526 | if (png_ptr->idat_size && png_ptr->save_buffer_size) |
| 527 | { |
| 528 | png_size_t save_size; |
| 529 | |
| 530 | if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size) |
| 531 | { |
| 532 | save_size = (png_size_t)png_ptr->idat_size; |
| 533 | /* check for overflow */ |
| 534 | if((png_uint_32)save_size != png_ptr->idat_size) |
| 535 | png_error(png_ptr, "save_size overflowed in pngpread"); |
| 536 | } |
| 537 | else |
| 538 | save_size = png_ptr->save_buffer_size; |
| 539 | |
| 540 | png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); |
| 541 | png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size); |
| 542 | |
| 543 | png_ptr->idat_size -= save_size; |
| 544 | png_ptr->buffer_size -= save_size; |
| 545 | png_ptr->save_buffer_size -= save_size; |
| 546 | png_ptr->save_buffer_ptr += save_size; |
| 547 | } |
| 548 | if (png_ptr->idat_size && png_ptr->current_buffer_size) |
| 549 | { |
| 550 | png_size_t save_size; |
| 551 | |
| 552 | if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size) |
| 553 | { |
| 554 | save_size = (png_size_t)png_ptr->idat_size; |
| 555 | /* check for overflow */ |
| 556 | if((png_uint_32)save_size != png_ptr->idat_size) |
| 557 | png_error(png_ptr, "save_size overflowed in pngpread"); |
| 558 | } |
| 559 | else |
| 560 | save_size = png_ptr->current_buffer_size; |
| 561 | |
| 562 | png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); |
| 563 | png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size); |
| 564 | |
| 565 | png_ptr->idat_size -= save_size; |
| 566 | png_ptr->buffer_size -= save_size; |
| 567 | png_ptr->current_buffer_size -= save_size; |
| 568 | png_ptr->current_buffer_ptr += save_size; |
| 569 | } |
| 570 | if (!png_ptr->idat_size) |
| 571 | { |
| 572 | if (png_ptr->buffer_size < 4) |
| 573 | { |
| 574 | png_push_save_buffer(png_ptr); |
| 575 | return; |
| 576 | } |
| 577 | |
| 578 | png_crc_finish(png_ptr, 0); |
| 579 | png_ptr->flags &= ~PNG_FLAG_HAVE_CHUNK_HEADER; |
| 580 | } |
| 581 | } |
| 582 | |
| 583 | void |
| 584 | png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, |
| 585 | png_size_t buffer_length) |
| 586 | { |
| 587 | int ret; |
| 588 | |
| 589 | if ((png_ptr->flags & PNG_FLAG_ZLIB_FINISHED) && buffer_length) |
| 590 | png_error(png_ptr, "Extra compression data"); |
| 591 | |
| 592 | png_ptr->zstream.next_in = buffer; |
| 593 | png_ptr->zstream.avail_in = (uInt)buffer_length; |
| 594 | for(;;) |
| 595 | { |
| 596 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
| 597 | if (ret == Z_STREAM_END) |
| 598 | { |
| 599 | if (png_ptr->zstream.avail_in) |
| 600 | png_error(png_ptr, "Extra compressed data"); |
| 601 | if (!(png_ptr->zstream.avail_out)) |
| 602 | { |
| 603 | png_push_process_row(png_ptr); |
| 604 | } |
| 605 | |
| 606 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 607 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| 608 | break; |
| 609 | } |
| 610 | else if (ret == Z_BUF_ERROR) |
| 611 | break; |
| 612 | else if (ret != Z_OK) |
| 613 | png_error(png_ptr, "Decompression Error"); |
| 614 | if (!(png_ptr->zstream.avail_out)) |
| 615 | { |
| 616 | png_push_process_row(png_ptr); |
| 617 | png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes; |
| 618 | png_ptr->zstream.next_out = png_ptr->row_buf; |
| 619 | } |
| 620 | else |
| 621 | break; |
| 622 | } |
| 623 | } |
| 624 | |
| 625 | void |
| 626 | png_push_process_row(png_structp png_ptr) |
| 627 | { |
| 628 | png_ptr->row_info.color_type = png_ptr->color_type; |
| 629 | png_ptr->row_info.width = png_ptr->iwidth; |
| 630 | png_ptr->row_info.channels = png_ptr->channels; |
| 631 | png_ptr->row_info.bit_depth = png_ptr->bit_depth; |
| 632 | png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; |
| 633 | |
| 634 | png_ptr->row_info.rowbytes = ((png_ptr->row_info.width * |
| 635 | (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3); |
| 636 | |
| 637 | png_read_filter_row(png_ptr, &(png_ptr->row_info), |
| 638 | png_ptr->row_buf + 1, png_ptr->prev_row + 1, |
| 639 | (int)(png_ptr->row_buf[0])); |
| 640 | |
| 641 | png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf, |
| 642 | png_ptr->rowbytes + 1); |
| 643 | |
| 644 | if (png_ptr->transformations) |
| 645 | png_do_read_transformations(png_ptr); |
| 646 | |
| 647 | #if defined(PNG_READ_INTERLACING_SUPPORTED) |
| 648 | /* blow up interlaced rows to full size */ |
| 649 | if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
| 650 | { |
| 651 | if (png_ptr->pass < 6) |
| 652 | png_do_read_interlace(&(png_ptr->row_info), |
| 653 | png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); |
| 654 | |
| 655 | switch (png_ptr->pass) |
| 656 | { |
| 657 | case 0: |
| 658 | { |
| 659 | int i; |
| 660 | for (i = 0; i < 8 && png_ptr->pass == 0; i++) |
| 661 | { |
| 662 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 663 | png_read_push_finish_row(png_ptr); |
| 664 | } |
| 665 | break; |
| 666 | } |
| 667 | case 1: |
| 668 | { |
| 669 | int i; |
| 670 | for (i = 0; i < 8 && png_ptr->pass == 1; i++) |
| 671 | { |
| 672 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 673 | png_read_push_finish_row(png_ptr); |
| 674 | } |
| 675 | if (png_ptr->pass == 2) |
| 676 | { |
| 677 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 678 | { |
| 679 | png_push_have_row(png_ptr, NULL); |
| 680 | png_read_push_finish_row(png_ptr); |
| 681 | } |
| 682 | } |
| 683 | break; |
| 684 | } |
| 685 | case 2: |
| 686 | { |
| 687 | int i; |
| 688 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 689 | { |
| 690 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 691 | png_read_push_finish_row(png_ptr); |
| 692 | } |
| 693 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 694 | { |
| 695 | png_push_have_row(png_ptr, NULL); |
| 696 | png_read_push_finish_row(png_ptr); |
| 697 | } |
| 698 | break; |
| 699 | } |
| 700 | case 3: |
| 701 | { |
| 702 | int i; |
| 703 | for (i = 0; i < 4 && png_ptr->pass == 3; i++) |
| 704 | { |
| 705 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 706 | png_read_push_finish_row(png_ptr); |
| 707 | } |
| 708 | if (png_ptr->pass == 4) |
| 709 | { |
| 710 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 711 | { |
| 712 | png_push_have_row(png_ptr, NULL); |
| 713 | png_read_push_finish_row(png_ptr); |
| 714 | } |
| 715 | } |
| 716 | break; |
| 717 | } |
| 718 | case 4: |
| 719 | { |
| 720 | int i; |
| 721 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 722 | { |
| 723 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 724 | png_read_push_finish_row(png_ptr); |
| 725 | } |
| 726 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 727 | { |
| 728 | png_push_have_row(png_ptr, NULL); |
| 729 | png_read_push_finish_row(png_ptr); |
| 730 | } |
| 731 | break; |
| 732 | } |
| 733 | case 5: |
| 734 | { |
| 735 | int i; |
| 736 | for (i = 0; i < 2 && png_ptr->pass == 5; i++) |
| 737 | { |
| 738 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 739 | png_read_push_finish_row(png_ptr); |
| 740 | } |
| 741 | if (png_ptr->pass == 6) |
| 742 | { |
| 743 | png_push_have_row(png_ptr, NULL); |
| 744 | png_read_push_finish_row(png_ptr); |
| 745 | } |
| 746 | break; |
| 747 | } |
| 748 | case 6: |
| 749 | { |
| 750 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 751 | png_read_push_finish_row(png_ptr); |
| 752 | if (png_ptr->pass != 6) |
| 753 | break; |
| 754 | png_push_have_row(png_ptr, NULL); |
| 755 | png_read_push_finish_row(png_ptr); |
| 756 | } |
| 757 | } |
| 758 | } |
| 759 | else |
| 760 | #endif |
| 761 | { |
| 762 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 763 | png_read_push_finish_row(png_ptr); |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | void |
| 768 | png_read_push_finish_row(png_structp png_ptr) |
| 769 | { |
| 770 | png_ptr->row_number++; |
| 771 | if (png_ptr->row_number < png_ptr->num_rows) |
| 772 | return; |
| 773 | |
| 774 | if (png_ptr->interlaced) |
| 775 | { |
| 776 | png_ptr->row_number = 0; |
| 777 | png_memset_check(png_ptr, png_ptr->prev_row, 0, |
| 778 | png_ptr->rowbytes + 1); |
| 779 | do |
| 780 | { |
| 781 | png_ptr->pass++; |
| 782 | if (png_ptr->pass >= 7) |
| 783 | break; |
| 784 | |
| 785 | png_ptr->iwidth = (png_ptr->width + |
| 786 | png_pass_inc[png_ptr->pass] - 1 - |
| 787 | png_pass_start[png_ptr->pass]) / |
| 788 | png_pass_inc[png_ptr->pass]; |
| 789 | |
| 790 | png_ptr->irowbytes = ((png_ptr->iwidth * |
| 791 | png_ptr->pixel_depth + 7) >> 3) + 1; |
| 792 | |
| 793 | if (png_ptr->transformations & PNG_INTERLACE) |
| 794 | break; |
| 795 | |
| 796 | png_ptr->num_rows = (png_ptr->height + |
| 797 | png_pass_yinc[png_ptr->pass] - 1 - |
| 798 | png_pass_ystart[png_ptr->pass]) / |
| 799 | png_pass_yinc[png_ptr->pass]; |
| 800 | |
| 801 | } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0); |
| 802 | } |
| 803 | } |
| 804 | |
| 805 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 806 | void |
| 807 | png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 808 | { |
| 809 | if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND) |
| 810 | { |
| 811 | png_error(png_ptr, "Out of place tEXt"); |
| 812 | /* to quiet some compiler warnings */ |
| 813 | if(info_ptr == NULL) return; |
| 814 | } |
| 815 | |
| 816 | #ifdef PNG_MAX_MALLOC_64K |
| 817 | png_ptr->skip_length = 0; /* This may not be necessary */ |
| 818 | |
| 819 | if (length > (png_uint_32)65535L) /* Can't hold the entire string in memory */ |
| 820 | { |
| 821 | png_warning(png_ptr, "tEXt chunk too large to fit in memory"); |
| 822 | png_ptr->skip_length = length - (png_uint_32)65535L; |
| 823 | length = (png_uint_32)65535L; |
| 824 | } |
| 825 | #endif |
| 826 | |
| 827 | png_ptr->current_text = (png_charp)png_malloc(png_ptr, |
| 828 | (png_uint_32)(length+1)); |
| 829 | png_ptr->current_text[length] = '\0'; |
| 830 | png_ptr->current_text_ptr = png_ptr->current_text; |
| 831 | png_ptr->current_text_size = (png_size_t)length; |
| 832 | png_ptr->current_text_left = (png_size_t)length; |
| 833 | png_ptr->process_mode = PNG_READ_tEXt_MODE; |
| 834 | } |
| 835 | |
| 836 | void |
| 837 | png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr) |
| 838 | { |
| 839 | if (png_ptr->buffer_size && png_ptr->current_text_left) |
| 840 | { |
| 841 | png_size_t text_size; |
| 842 | |
| 843 | if (png_ptr->buffer_size < png_ptr->current_text_left) |
| 844 | text_size = png_ptr->buffer_size; |
| 845 | else |
| 846 | text_size = png_ptr->current_text_left; |
| 847 | png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
| 848 | png_ptr->current_text_left -= text_size; |
| 849 | png_ptr->current_text_ptr += text_size; |
| 850 | } |
| 851 | if (!(png_ptr->current_text_left)) |
| 852 | { |
| 853 | png_textp text_ptr; |
| 854 | png_charp text; |
| 855 | png_charp key; |
| 856 | |
| 857 | if (png_ptr->buffer_size < 4) |
| 858 | { |
| 859 | png_push_save_buffer(png_ptr); |
| 860 | return; |
| 861 | } |
| 862 | |
| 863 | png_push_crc_finish(png_ptr); |
| 864 | |
| 865 | #if defined(PNG_MAX_MALLOC_64K) |
| 866 | if (png_ptr->skip_length) |
| 867 | return; |
| 868 | #endif |
| 869 | |
| 870 | key = png_ptr->current_text; |
| 871 | png_ptr->current_text = 0; |
| 872 | |
| 873 | for (text = key; *text; text++) |
| 874 | /* empty loop */ ; |
| 875 | |
| 876 | if (text != key + png_ptr->current_text_size) |
| 877 | text++; |
| 878 | |
| 879 | text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text)); |
| 880 | text_ptr->compression = PNG_TEXT_COMPRESSION_NONE; |
| 881 | text_ptr->key = key; |
| 882 | text_ptr->text = text; |
| 883 | |
| 884 | png_set_text(png_ptr, info_ptr, text_ptr, 1); |
| 885 | |
| 886 | png_free(png_ptr, text_ptr); |
| 887 | } |
| 888 | } |
| 889 | #endif |
| 890 | |
| 891 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 892 | void |
| 893 | png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 894 | { |
| 895 | if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND) |
| 896 | { |
| 897 | png_error(png_ptr, "Out of place zTXt"); |
| 898 | /* to quiet some compiler warnings */ |
| 899 | if(info_ptr == NULL) return; |
| 900 | } |
| 901 | |
| 902 | #ifdef PNG_MAX_MALLOC_64K |
| 903 | /* We can't handle zTXt chunks > 64K, since we don't have enough space |
| 904 | * to be able to store the uncompressed data. Actually, the threshold |
| 905 | * is probably around 32K, but it isn't as definite as 64K is. |
| 906 | */ |
| 907 | if (length > (png_uint_32)65535L) |
| 908 | { |
| 909 | png_warning(png_ptr, "zTXt chunk too large to fit in memory"); |
| 910 | png_push_crc_skip(png_ptr, length); |
| 911 | return; |
| 912 | } |
| 913 | #endif |
| 914 | |
| 915 | png_ptr->current_text = (png_charp)png_malloc(png_ptr, |
| 916 | (png_uint_32)(length+1)); |
| 917 | png_ptr->current_text[length] = '\0'; |
| 918 | png_ptr->current_text_ptr = png_ptr->current_text; |
| 919 | png_ptr->current_text_size = (png_size_t)length; |
| 920 | png_ptr->current_text_left = (png_size_t)length; |
| 921 | png_ptr->process_mode = PNG_READ_zTXt_MODE; |
| 922 | } |
| 923 | |
| 924 | void |
| 925 | png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr) |
| 926 | { |
| 927 | if (png_ptr->buffer_size && png_ptr->current_text_left) |
| 928 | { |
| 929 | png_size_t text_size; |
| 930 | |
| 931 | if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left) |
| 932 | text_size = png_ptr->buffer_size; |
| 933 | else |
| 934 | text_size = png_ptr->current_text_left; |
| 935 | png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
| 936 | png_ptr->current_text_left -= text_size; |
| 937 | png_ptr->current_text_ptr += text_size; |
| 938 | } |
| 939 | if (!(png_ptr->current_text_left)) |
| 940 | { |
| 941 | png_textp text_ptr; |
| 942 | png_charp text; |
| 943 | png_charp key; |
| 944 | int ret; |
| 945 | png_size_t text_size, key_size; |
| 946 | |
| 947 | if (png_ptr->buffer_size < 4) |
| 948 | { |
| 949 | png_push_save_buffer(png_ptr); |
| 950 | return; |
| 951 | } |
| 952 | |
| 953 | png_push_crc_finish(png_ptr); |
| 954 | |
| 955 | key = png_ptr->current_text; |
| 956 | png_ptr->current_text = 0; |
| 957 | |
| 958 | for (text = key; *text; text++) |
| 959 | /* empty loop */ ; |
| 960 | |
| 961 | /* zTXt can't have zero text */ |
| 962 | if (text == key + png_ptr->current_text_size) |
| 963 | { |
| 964 | png_free(png_ptr, key); |
| 965 | return; |
| 966 | } |
| 967 | |
| 968 | text++; |
| 969 | |
| 970 | if (*text != PNG_TEXT_COMPRESSION_zTXt) /* check compression byte */ |
| 971 | { |
| 972 | png_free(png_ptr, key); |
| 973 | return; |
| 974 | } |
| 975 | |
| 976 | text++; |
| 977 | |
| 978 | png_ptr->zstream.next_in = (png_bytep )text; |
| 979 | png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size - |
| 980 | (text - key)); |
| 981 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 982 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 983 | |
| 984 | key_size = text - key; |
| 985 | text_size = 0; |
| 986 | text = NULL; |
| 987 | ret = Z_STREAM_END; |
| 988 | |
| 989 | while (png_ptr->zstream.avail_in) |
| 990 | { |
| 991 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
| 992 | if (ret != Z_OK && ret != Z_STREAM_END) |
| 993 | { |
| 994 | inflateReset(&png_ptr->zstream); |
| 995 | png_ptr->zstream.avail_in = 0; |
| 996 | png_free(png_ptr, key); |
| 997 | png_free(png_ptr, text); |
| 998 | return; |
| 999 | } |
| 1000 | if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END) |
| 1001 | { |
| 1002 | if (text == NULL) |
| 1003 | { |
| 1004 | text = (png_charp)png_malloc(png_ptr, |
| 1005 | (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out + |
| 1006 | key_size + 1)); |
| 1007 | png_memcpy(text + key_size, png_ptr->zbuf, |
| 1008 | png_ptr->zbuf_size - png_ptr->zstream.avail_out); |
| 1009 | png_memcpy(text, key, key_size); |
| 1010 | text_size = key_size + png_ptr->zbuf_size - |
| 1011 | png_ptr->zstream.avail_out; |
| 1012 | *(text + text_size) = '\0'; |
| 1013 | } |
| 1014 | else |
| 1015 | { |
| 1016 | png_charp tmp; |
| 1017 | |
| 1018 | tmp = text; |
| 1019 | text = (png_charp)png_malloc(png_ptr, text_size + |
| 1020 | (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out |
| 1021 | + 1)); |
| 1022 | png_memcpy(text, tmp, text_size); |
| 1023 | png_free(png_ptr, tmp); |
| 1024 | png_memcpy(text + text_size, png_ptr->zbuf, |
| 1025 | png_ptr->zbuf_size - png_ptr->zstream.avail_out); |
| 1026 | text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out; |
| 1027 | *(text + text_size) = '\0'; |
| 1028 | } |
| 1029 | if (ret != Z_STREAM_END) |
| 1030 | { |
| 1031 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 1032 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 1033 | } |
| 1034 | } |
| 1035 | else |
| 1036 | { |
| 1037 | break; |
| 1038 | } |
| 1039 | |
| 1040 | if (ret == Z_STREAM_END) |
| 1041 | break; |
| 1042 | } |
| 1043 | |
| 1044 | inflateReset(&png_ptr->zstream); |
| 1045 | png_ptr->zstream.avail_in = 0; |
| 1046 | |
| 1047 | if (ret != Z_STREAM_END) |
| 1048 | { |
| 1049 | png_free(png_ptr, key); |
| 1050 | png_free(png_ptr, text); |
| 1051 | return; |
| 1052 | } |
| 1053 | |
| 1054 | png_free(png_ptr, key); |
| 1055 | key = text; |
| 1056 | text += key_size; |
| 1057 | |
| 1058 | text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text)); |
| 1059 | text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt; |
| 1060 | text_ptr->key = key; |
| 1061 | text_ptr->text = text; |
| 1062 | |
| 1063 | png_set_text(png_ptr, info_ptr, text_ptr, 1); |
| 1064 | |
| 1065 | png_free(png_ptr, text_ptr); |
| 1066 | } |
| 1067 | } |
| 1068 | #endif |
| 1069 | |
| 1070 | /* This function is called when we haven't found a handler for this |
| 1071 | * chunk. In the future we will have code here that can handle |
| 1072 | * user-defined callback functions for unknown chunks before they are |
| 1073 | * ignored or cause an error. If there isn't a problem with the |
| 1074 | * chunk itself (ie a bad chunk name or a critical chunk), the chunk |
| 1075 | * is (currently) silently ignored. |
| 1076 | */ |
| 1077 | void |
| 1078 | png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1079 | { |
| 1080 | png_check_chunk_name(png_ptr, png_ptr->chunk_name); |
| 1081 | |
| 1082 | if (!(png_ptr->chunk_name[0] & 0x20)) |
| 1083 | { |
| 1084 | png_chunk_error(png_ptr, "unknown critical chunk"); |
| 1085 | /* to quiet some compiler warnings */ |
| 1086 | if(info_ptr == NULL) return; |
| 1087 | } |
| 1088 | |
| 1089 | png_push_crc_skip(png_ptr, length); |
| 1090 | } |
| 1091 | |
| 1092 | void |
| 1093 | png_push_have_info(png_structp png_ptr, png_infop info_ptr) |
| 1094 | { |
| 1095 | if (png_ptr->info_fn != NULL) |
| 1096 | (*(png_ptr->info_fn))(png_ptr, info_ptr); |
| 1097 | } |
| 1098 | |
| 1099 | void |
| 1100 | png_push_have_end(png_structp png_ptr, png_infop info_ptr) |
| 1101 | { |
| 1102 | if (png_ptr->end_fn != NULL) |
| 1103 | (*(png_ptr->end_fn))(png_ptr, info_ptr); |
| 1104 | } |
| 1105 | |
| 1106 | void |
| 1107 | png_push_have_row(png_structp png_ptr, png_bytep row) |
| 1108 | { |
| 1109 | if (png_ptr->row_fn != NULL) |
| 1110 | (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number, |
| 1111 | (int)png_ptr->pass); |
| 1112 | } |
| 1113 | |
| 1114 | void |
| 1115 | png_progressive_combine_row (png_structp png_ptr, |
| 1116 | png_bytep old_row, png_bytep new_row) |
| 1117 | { |
| 1118 | if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */ |
| 1119 | png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]); |
| 1120 | } |
| 1121 | |
| 1122 | void |
| 1123 | png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr, |
| 1124 | png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, |
| 1125 | png_progressive_end_ptr end_fn) |
| 1126 | { |
| 1127 | png_ptr->info_fn = info_fn; |
| 1128 | png_ptr->row_fn = row_fn; |
| 1129 | png_ptr->end_fn = end_fn; |
| 1130 | |
| 1131 | png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer); |
| 1132 | } |
| 1133 | |
| 1134 | png_voidp |
| 1135 | png_get_progressive_ptr(png_structp png_ptr) |
| 1136 | { |
| 1137 | return png_ptr->io_ptr; |
| 1138 | } |
| 1139 | |
| 1140 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| 1141 | |