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annotate libs/libpng/pngpread.c @ 14:06dc8b9b4f89

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added libimago, libjpeg and libpng
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 07 Jun 2015 17:25:49 +0300
parents
children
rev   line source
nuclear@14 1
nuclear@14 2 /* pngpread.c - read a png file in push mode
nuclear@14 3 *
nuclear@14 4 * Last changed in libpng 1.2.32 [September 18, 2008]
nuclear@14 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@14 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@14 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@14 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@14 9 */
nuclear@14 10
nuclear@14 11 #define PNG_INTERNAL
nuclear@14 12 #include "png.h"
nuclear@14 13 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@14 14
nuclear@14 15 /* push model modes */
nuclear@14 16 #define PNG_READ_SIG_MODE 0
nuclear@14 17 #define PNG_READ_CHUNK_MODE 1
nuclear@14 18 #define PNG_READ_IDAT_MODE 2
nuclear@14 19 #define PNG_SKIP_MODE 3
nuclear@14 20 #define PNG_READ_tEXt_MODE 4
nuclear@14 21 #define PNG_READ_zTXt_MODE 5
nuclear@14 22 #define PNG_READ_DONE_MODE 6
nuclear@14 23 #define PNG_READ_iTXt_MODE 7
nuclear@14 24 #define PNG_ERROR_MODE 8
nuclear@14 25
nuclear@14 26 void PNGAPI
nuclear@14 27 png_process_data(png_structp png_ptr, png_infop info_ptr,
nuclear@14 28 png_bytep buffer, png_size_t buffer_size)
nuclear@14 29 {
nuclear@14 30 if (png_ptr == NULL || info_ptr == NULL) return;
nuclear@14 31 png_push_restore_buffer(png_ptr, buffer, buffer_size);
nuclear@14 32
nuclear@14 33 while (png_ptr->buffer_size)
nuclear@14 34 {
nuclear@14 35 png_process_some_data(png_ptr, info_ptr);
nuclear@14 36 }
nuclear@14 37 }
nuclear@14 38
nuclear@14 39 /* What we do with the incoming data depends on what we were previously
nuclear@14 40 * doing before we ran out of data...
nuclear@14 41 */
nuclear@14 42 void /* PRIVATE */
nuclear@14 43 png_process_some_data(png_structp png_ptr, png_infop info_ptr)
nuclear@14 44 {
nuclear@14 45 if (png_ptr == NULL) return;
nuclear@14 46 switch (png_ptr->process_mode)
nuclear@14 47 {
nuclear@14 48 case PNG_READ_SIG_MODE:
nuclear@14 49 {
nuclear@14 50 png_push_read_sig(png_ptr, info_ptr);
nuclear@14 51 break;
nuclear@14 52 }
nuclear@14 53 case PNG_READ_CHUNK_MODE:
nuclear@14 54 {
nuclear@14 55 png_push_read_chunk(png_ptr, info_ptr);
nuclear@14 56 break;
nuclear@14 57 }
nuclear@14 58 case PNG_READ_IDAT_MODE:
nuclear@14 59 {
nuclear@14 60 png_push_read_IDAT(png_ptr);
nuclear@14 61 break;
nuclear@14 62 }
nuclear@14 63 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@14 64 case PNG_READ_tEXt_MODE:
nuclear@14 65 {
nuclear@14 66 png_push_read_tEXt(png_ptr, info_ptr);
nuclear@14 67 break;
nuclear@14 68 }
nuclear@14 69 #endif
nuclear@14 70 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@14 71 case PNG_READ_zTXt_MODE:
nuclear@14 72 {
nuclear@14 73 png_push_read_zTXt(png_ptr, info_ptr);
nuclear@14 74 break;
nuclear@14 75 }
nuclear@14 76 #endif
nuclear@14 77 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@14 78 case PNG_READ_iTXt_MODE:
nuclear@14 79 {
nuclear@14 80 png_push_read_iTXt(png_ptr, info_ptr);
nuclear@14 81 break;
nuclear@14 82 }
nuclear@14 83 #endif
nuclear@14 84 case PNG_SKIP_MODE:
nuclear@14 85 {
nuclear@14 86 png_push_crc_finish(png_ptr);
nuclear@14 87 break;
nuclear@14 88 }
nuclear@14 89 default:
nuclear@14 90 {
nuclear@14 91 png_ptr->buffer_size = 0;
nuclear@14 92 break;
nuclear@14 93 }
nuclear@14 94 }
nuclear@14 95 }
nuclear@14 96
nuclear@14 97 /* Read any remaining signature bytes from the stream and compare them with
nuclear@14 98 * the correct PNG signature. It is possible that this routine is called
nuclear@14 99 * with bytes already read from the signature, either because they have been
nuclear@14 100 * checked by the calling application, or because of multiple calls to this
nuclear@14 101 * routine.
nuclear@14 102 */
nuclear@14 103 void /* PRIVATE */
nuclear@14 104 png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
nuclear@14 105 {
nuclear@14 106 png_size_t num_checked = png_ptr->sig_bytes,
nuclear@14 107 num_to_check = 8 - num_checked;
nuclear@14 108
nuclear@14 109 if (png_ptr->buffer_size < num_to_check)
nuclear@14 110 {
nuclear@14 111 num_to_check = png_ptr->buffer_size;
nuclear@14 112 }
nuclear@14 113
nuclear@14 114 png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]),
nuclear@14 115 num_to_check);
nuclear@14 116 png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes + num_to_check);
nuclear@14 117
nuclear@14 118 if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
nuclear@14 119 {
nuclear@14 120 if (num_checked < 4 &&
nuclear@14 121 png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
nuclear@14 122 png_error(png_ptr, "Not a PNG file");
nuclear@14 123 else
nuclear@14 124 png_error(png_ptr, "PNG file corrupted by ASCII conversion");
nuclear@14 125 }
nuclear@14 126 else
nuclear@14 127 {
nuclear@14 128 if (png_ptr->sig_bytes >= 8)
nuclear@14 129 {
nuclear@14 130 png_ptr->process_mode = PNG_READ_CHUNK_MODE;
nuclear@14 131 }
nuclear@14 132 }
nuclear@14 133 }
nuclear@14 134
nuclear@14 135 void /* PRIVATE */
nuclear@14 136 png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
nuclear@14 137 {
nuclear@14 138 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@14 139 PNG_CONST PNG_IHDR;
nuclear@14 140 PNG_CONST PNG_IDAT;
nuclear@14 141 PNG_CONST PNG_IEND;
nuclear@14 142 PNG_CONST PNG_PLTE;
nuclear@14 143 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@14 144 PNG_CONST PNG_bKGD;
nuclear@14 145 #endif
nuclear@14 146 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@14 147 PNG_CONST PNG_cHRM;
nuclear@14 148 #endif
nuclear@14 149 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@14 150 PNG_CONST PNG_gAMA;
nuclear@14 151 #endif
nuclear@14 152 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@14 153 PNG_CONST PNG_hIST;
nuclear@14 154 #endif
nuclear@14 155 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@14 156 PNG_CONST PNG_iCCP;
nuclear@14 157 #endif
nuclear@14 158 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@14 159 PNG_CONST PNG_iTXt;
nuclear@14 160 #endif
nuclear@14 161 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@14 162 PNG_CONST PNG_oFFs;
nuclear@14 163 #endif
nuclear@14 164 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@14 165 PNG_CONST PNG_pCAL;
nuclear@14 166 #endif
nuclear@14 167 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@14 168 PNG_CONST PNG_pHYs;
nuclear@14 169 #endif
nuclear@14 170 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@14 171 PNG_CONST PNG_sBIT;
nuclear@14 172 #endif
nuclear@14 173 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@14 174 PNG_CONST PNG_sCAL;
nuclear@14 175 #endif
nuclear@14 176 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@14 177 PNG_CONST PNG_sRGB;
nuclear@14 178 #endif
nuclear@14 179 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@14 180 PNG_CONST PNG_sPLT;
nuclear@14 181 #endif
nuclear@14 182 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@14 183 PNG_CONST PNG_tEXt;
nuclear@14 184 #endif
nuclear@14 185 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@14 186 PNG_CONST PNG_tIME;
nuclear@14 187 #endif
nuclear@14 188 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@14 189 PNG_CONST PNG_tRNS;
nuclear@14 190 #endif
nuclear@14 191 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@14 192 PNG_CONST PNG_zTXt;
nuclear@14 193 #endif
nuclear@14 194 #endif /* PNG_USE_LOCAL_ARRAYS */
nuclear@14 195 /* First we make sure we have enough data for the 4 byte chunk name
nuclear@14 196 * and the 4 byte chunk length before proceeding with decoding the
nuclear@14 197 * chunk data. To fully decode each of these chunks, we also make
nuclear@14 198 * sure we have enough data in the buffer for the 4 byte CRC at the
nuclear@14 199 * end of every chunk (except IDAT, which is handled separately).
nuclear@14 200 */
nuclear@14 201 if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
nuclear@14 202 {
nuclear@14 203 png_byte chunk_length[4];
nuclear@14 204
nuclear@14 205 if (png_ptr->buffer_size < 8)
nuclear@14 206 {
nuclear@14 207 png_push_save_buffer(png_ptr);
nuclear@14 208 return;
nuclear@14 209 }
nuclear@14 210
nuclear@14 211 png_push_fill_buffer(png_ptr, chunk_length, 4);
nuclear@14 212 png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
nuclear@14 213 png_reset_crc(png_ptr);
nuclear@14 214 png_crc_read(png_ptr, png_ptr->chunk_name, 4);
nuclear@14 215 png_check_chunk_name(png_ptr, png_ptr->chunk_name);
nuclear@14 216 png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
nuclear@14 217 }
nuclear@14 218
nuclear@14 219 if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@14 220 if (png_ptr->mode & PNG_AFTER_IDAT)
nuclear@14 221 png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
nuclear@14 222
nuclear@14 223 if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
nuclear@14 224 {
nuclear@14 225 if (png_ptr->push_length != 13)
nuclear@14 226 png_error(png_ptr, "Invalid IHDR length");
nuclear@14 227 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 228 {
nuclear@14 229 png_push_save_buffer(png_ptr);
nuclear@14 230 return;
nuclear@14 231 }
nuclear@14 232 png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 233 }
nuclear@14 234 else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
nuclear@14 235 {
nuclear@14 236 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 237 {
nuclear@14 238 png_push_save_buffer(png_ptr);
nuclear@14 239 return;
nuclear@14 240 }
nuclear@14 241 png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 242
nuclear@14 243 png_ptr->process_mode = PNG_READ_DONE_MODE;
nuclear@14 244 png_push_have_end(png_ptr, info_ptr);
nuclear@14 245 }
nuclear@14 246 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@14 247 else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
nuclear@14 248 {
nuclear@14 249 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 250 {
nuclear@14 251 png_push_save_buffer(png_ptr);
nuclear@14 252 return;
nuclear@14 253 }
nuclear@14 254 if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@14 255 png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@14 256 png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 257 if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
nuclear@14 258 png_ptr->mode |= PNG_HAVE_PLTE;
nuclear@14 259 else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@14 260 {
nuclear@14 261 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@14 262 png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@14 263 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@14 264 !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@14 265 png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@14 266 }
nuclear@14 267 }
nuclear@14 268 #endif
nuclear@14 269 else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
nuclear@14 270 {
nuclear@14 271 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 272 {
nuclear@14 273 png_push_save_buffer(png_ptr);
nuclear@14 274 return;
nuclear@14 275 }
nuclear@14 276 png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 277 }
nuclear@14 278 else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@14 279 {
nuclear@14 280 /* If we reach an IDAT chunk, this means we have read all of the
nuclear@14 281 * header chunks, and we can start reading the image (or if this
nuclear@14 282 * is called after the image has been read - we have an error).
nuclear@14 283 */
nuclear@14 284 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@14 285 png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@14 286 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@14 287 !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@14 288 png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@14 289
nuclear@14 290 if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@14 291 {
nuclear@14 292 if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
nuclear@14 293 if (png_ptr->push_length == 0)
nuclear@14 294 return;
nuclear@14 295
nuclear@14 296 if (png_ptr->mode & PNG_AFTER_IDAT)
nuclear@14 297 png_error(png_ptr, "Too many IDAT's found");
nuclear@14 298 }
nuclear@14 299
nuclear@14 300 png_ptr->idat_size = png_ptr->push_length;
nuclear@14 301 png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@14 302 png_ptr->process_mode = PNG_READ_IDAT_MODE;
nuclear@14 303 png_push_have_info(png_ptr, info_ptr);
nuclear@14 304 png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
nuclear@14 305 png_ptr->zstream.next_out = png_ptr->row_buf;
nuclear@14 306 return;
nuclear@14 307 }
nuclear@14 308 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@14 309 else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
nuclear@14 310 {
nuclear@14 311 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 312 {
nuclear@14 313 png_push_save_buffer(png_ptr);
nuclear@14 314 return;
nuclear@14 315 }
nuclear@14 316 png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 317 }
nuclear@14 318 #endif
nuclear@14 319 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@14 320 else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
nuclear@14 321 {
nuclear@14 322 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 323 {
nuclear@14 324 png_push_save_buffer(png_ptr);
nuclear@14 325 return;
nuclear@14 326 }
nuclear@14 327 png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 328 }
nuclear@14 329 #endif
nuclear@14 330 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@14 331 else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
nuclear@14 332 {
nuclear@14 333 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 334 {
nuclear@14 335 png_push_save_buffer(png_ptr);
nuclear@14 336 return;
nuclear@14 337 }
nuclear@14 338 png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 339 }
nuclear@14 340 #endif
nuclear@14 341 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@14 342 else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
nuclear@14 343 {
nuclear@14 344 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 345 {
nuclear@14 346 png_push_save_buffer(png_ptr);
nuclear@14 347 return;
nuclear@14 348 }
nuclear@14 349 png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 350 }
nuclear@14 351 #endif
nuclear@14 352 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@14 353 else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
nuclear@14 354 {
nuclear@14 355 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 356 {
nuclear@14 357 png_push_save_buffer(png_ptr);
nuclear@14 358 return;
nuclear@14 359 }
nuclear@14 360 png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 361 }
nuclear@14 362 #endif
nuclear@14 363 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@14 364 else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
nuclear@14 365 {
nuclear@14 366 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 367 {
nuclear@14 368 png_push_save_buffer(png_ptr);
nuclear@14 369 return;
nuclear@14 370 }
nuclear@14 371 png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 372 }
nuclear@14 373 #endif
nuclear@14 374 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@14 375 else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
nuclear@14 376 {
nuclear@14 377 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 378 {
nuclear@14 379 png_push_save_buffer(png_ptr);
nuclear@14 380 return;
nuclear@14 381 }
nuclear@14 382 png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 383 }
nuclear@14 384 #endif
nuclear@14 385 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@14 386 else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
nuclear@14 387 {
nuclear@14 388 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 389 {
nuclear@14 390 png_push_save_buffer(png_ptr);
nuclear@14 391 return;
nuclear@14 392 }
nuclear@14 393 png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 394 }
nuclear@14 395 #endif
nuclear@14 396 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@14 397 else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
nuclear@14 398 {
nuclear@14 399 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 400 {
nuclear@14 401 png_push_save_buffer(png_ptr);
nuclear@14 402 return;
nuclear@14 403 }
nuclear@14 404 png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 405 }
nuclear@14 406 #endif
nuclear@14 407 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@14 408 else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
nuclear@14 409 {
nuclear@14 410 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 411 {
nuclear@14 412 png_push_save_buffer(png_ptr);
nuclear@14 413 return;
nuclear@14 414 }
nuclear@14 415 png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 416 }
nuclear@14 417 #endif
nuclear@14 418 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@14 419 else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
nuclear@14 420 {
nuclear@14 421 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 422 {
nuclear@14 423 png_push_save_buffer(png_ptr);
nuclear@14 424 return;
nuclear@14 425 }
nuclear@14 426 png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 427 }
nuclear@14 428 #endif
nuclear@14 429 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@14 430 else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
nuclear@14 431 {
nuclear@14 432 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 433 {
nuclear@14 434 png_push_save_buffer(png_ptr);
nuclear@14 435 return;
nuclear@14 436 }
nuclear@14 437 png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 438 }
nuclear@14 439 #endif
nuclear@14 440 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@14 441 else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
nuclear@14 442 {
nuclear@14 443 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 444 {
nuclear@14 445 png_push_save_buffer(png_ptr);
nuclear@14 446 return;
nuclear@14 447 }
nuclear@14 448 png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 449 }
nuclear@14 450 #endif
nuclear@14 451 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@14 452 else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
nuclear@14 453 {
nuclear@14 454 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 455 {
nuclear@14 456 png_push_save_buffer(png_ptr);
nuclear@14 457 return;
nuclear@14 458 }
nuclear@14 459 png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 460 }
nuclear@14 461 #endif
nuclear@14 462 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@14 463 else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
nuclear@14 464 {
nuclear@14 465 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 466 {
nuclear@14 467 png_push_save_buffer(png_ptr);
nuclear@14 468 return;
nuclear@14 469 }
nuclear@14 470 png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 471 }
nuclear@14 472 #endif
nuclear@14 473 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@14 474 else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
nuclear@14 475 {
nuclear@14 476 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 477 {
nuclear@14 478 png_push_save_buffer(png_ptr);
nuclear@14 479 return;
nuclear@14 480 }
nuclear@14 481 png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 482 }
nuclear@14 483 #endif
nuclear@14 484 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@14 485 else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
nuclear@14 486 {
nuclear@14 487 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 488 {
nuclear@14 489 png_push_save_buffer(png_ptr);
nuclear@14 490 return;
nuclear@14 491 }
nuclear@14 492 png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 493 }
nuclear@14 494 #endif
nuclear@14 495 else
nuclear@14 496 {
nuclear@14 497 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@14 498 {
nuclear@14 499 png_push_save_buffer(png_ptr);
nuclear@14 500 return;
nuclear@14 501 }
nuclear@14 502 png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
nuclear@14 503 }
nuclear@14 504
nuclear@14 505 png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
nuclear@14 506 }
nuclear@14 507
nuclear@14 508 void /* PRIVATE */
nuclear@14 509 png_push_crc_skip(png_structp png_ptr, png_uint_32 skip)
nuclear@14 510 {
nuclear@14 511 png_ptr->process_mode = PNG_SKIP_MODE;
nuclear@14 512 png_ptr->skip_length = skip;
nuclear@14 513 }
nuclear@14 514
nuclear@14 515 void /* PRIVATE */
nuclear@14 516 png_push_crc_finish(png_structp png_ptr)
nuclear@14 517 {
nuclear@14 518 if (png_ptr->skip_length && png_ptr->save_buffer_size)
nuclear@14 519 {
nuclear@14 520 png_size_t save_size;
nuclear@14 521
nuclear@14 522 if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size)
nuclear@14 523 save_size = (png_size_t)png_ptr->skip_length;
nuclear@14 524 else
nuclear@14 525 save_size = png_ptr->save_buffer_size;
nuclear@14 526
nuclear@14 527 png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
nuclear@14 528
nuclear@14 529 png_ptr->skip_length -= save_size;
nuclear@14 530 png_ptr->buffer_size -= save_size;
nuclear@14 531 png_ptr->save_buffer_size -= save_size;
nuclear@14 532 png_ptr->save_buffer_ptr += save_size;
nuclear@14 533 }
nuclear@14 534 if (png_ptr->skip_length && png_ptr->current_buffer_size)
nuclear@14 535 {
nuclear@14 536 png_size_t save_size;
nuclear@14 537
nuclear@14 538 if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size)
nuclear@14 539 save_size = (png_size_t)png_ptr->skip_length;
nuclear@14 540 else
nuclear@14 541 save_size = png_ptr->current_buffer_size;
nuclear@14 542
nuclear@14 543 png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
nuclear@14 544
nuclear@14 545 png_ptr->skip_length -= save_size;
nuclear@14 546 png_ptr->buffer_size -= save_size;
nuclear@14 547 png_ptr->current_buffer_size -= save_size;
nuclear@14 548 png_ptr->current_buffer_ptr += save_size;
nuclear@14 549 }
nuclear@14 550 if (!png_ptr->skip_length)
nuclear@14 551 {
nuclear@14 552 if (png_ptr->buffer_size < 4)
nuclear@14 553 {
nuclear@14 554 png_push_save_buffer(png_ptr);
nuclear@14 555 return;
nuclear@14 556 }
nuclear@14 557
nuclear@14 558 png_crc_finish(png_ptr, 0);
nuclear@14 559 png_ptr->process_mode = PNG_READ_CHUNK_MODE;
nuclear@14 560 }
nuclear@14 561 }
nuclear@14 562
nuclear@14 563 void PNGAPI
nuclear@14 564 png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
nuclear@14 565 {
nuclear@14 566 png_bytep ptr;
nuclear@14 567
nuclear@14 568 if (png_ptr == NULL) return;
nuclear@14 569 ptr = buffer;
nuclear@14 570 if (png_ptr->save_buffer_size)
nuclear@14 571 {
nuclear@14 572 png_size_t save_size;
nuclear@14 573
nuclear@14 574 if (length < png_ptr->save_buffer_size)
nuclear@14 575 save_size = length;
nuclear@14 576 else
nuclear@14 577 save_size = png_ptr->save_buffer_size;
nuclear@14 578
nuclear@14 579 png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size);
nuclear@14 580 length -= save_size;
nuclear@14 581 ptr += save_size;
nuclear@14 582 png_ptr->buffer_size -= save_size;
nuclear@14 583 png_ptr->save_buffer_size -= save_size;
nuclear@14 584 png_ptr->save_buffer_ptr += save_size;
nuclear@14 585 }
nuclear@14 586 if (length && png_ptr->current_buffer_size)
nuclear@14 587 {
nuclear@14 588 png_size_t save_size;
nuclear@14 589
nuclear@14 590 if (length < png_ptr->current_buffer_size)
nuclear@14 591 save_size = length;
nuclear@14 592 else
nuclear@14 593 save_size = png_ptr->current_buffer_size;
nuclear@14 594
nuclear@14 595 png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size);
nuclear@14 596 png_ptr->buffer_size -= save_size;
nuclear@14 597 png_ptr->current_buffer_size -= save_size;
nuclear@14 598 png_ptr->current_buffer_ptr += save_size;
nuclear@14 599 }
nuclear@14 600 }
nuclear@14 601
nuclear@14 602 void /* PRIVATE */
nuclear@14 603 png_push_save_buffer(png_structp png_ptr)
nuclear@14 604 {
nuclear@14 605 if (png_ptr->save_buffer_size)
nuclear@14 606 {
nuclear@14 607 if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
nuclear@14 608 {
nuclear@14 609 png_size_t i, istop;
nuclear@14 610 png_bytep sp;
nuclear@14 611 png_bytep dp;
nuclear@14 612
nuclear@14 613 istop = png_ptr->save_buffer_size;
nuclear@14 614 for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer;
nuclear@14 615 i < istop; i++, sp++, dp++)
nuclear@14 616 {
nuclear@14 617 *dp = *sp;
nuclear@14 618 }
nuclear@14 619 }
nuclear@14 620 }
nuclear@14 621 if (png_ptr->save_buffer_size + png_ptr->current_buffer_size >
nuclear@14 622 png_ptr->save_buffer_max)
nuclear@14 623 {
nuclear@14 624 png_size_t new_max;
nuclear@14 625 png_bytep old_buffer;
nuclear@14 626
nuclear@14 627 if (png_ptr->save_buffer_size > PNG_SIZE_MAX -
nuclear@14 628 (png_ptr->current_buffer_size + 256))
nuclear@14 629 {
nuclear@14 630 png_error(png_ptr, "Potential overflow of save_buffer");
nuclear@14 631 }
nuclear@14 632 new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
nuclear@14 633 old_buffer = png_ptr->save_buffer;
nuclear@14 634 png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr,
nuclear@14 635 (png_uint_32)new_max);
nuclear@14 636 png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
nuclear@14 637 png_free(png_ptr, old_buffer);
nuclear@14 638 png_ptr->save_buffer_max = new_max;
nuclear@14 639 }
nuclear@14 640 if (png_ptr->current_buffer_size)
nuclear@14 641 {
nuclear@14 642 png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size,
nuclear@14 643 png_ptr->current_buffer_ptr, png_ptr->current_buffer_size);
nuclear@14 644 png_ptr->save_buffer_size += png_ptr->current_buffer_size;
nuclear@14 645 png_ptr->current_buffer_size = 0;
nuclear@14 646 }
nuclear@14 647 png_ptr->save_buffer_ptr = png_ptr->save_buffer;
nuclear@14 648 png_ptr->buffer_size = 0;
nuclear@14 649 }
nuclear@14 650
nuclear@14 651 void /* PRIVATE */
nuclear@14 652 png_push_restore_buffer(png_structp png_ptr, png_bytep buffer,
nuclear@14 653 png_size_t buffer_length)
nuclear@14 654 {
nuclear@14 655 png_ptr->current_buffer = buffer;
nuclear@14 656 png_ptr->current_buffer_size = buffer_length;
nuclear@14 657 png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size;
nuclear@14 658 png_ptr->current_buffer_ptr = png_ptr->current_buffer;
nuclear@14 659 }
nuclear@14 660
nuclear@14 661 void /* PRIVATE */
nuclear@14 662 png_push_read_IDAT(png_structp png_ptr)
nuclear@14 663 {
nuclear@14 664 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@14 665 PNG_CONST PNG_IDAT;
nuclear@14 666 #endif
nuclear@14 667 if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
nuclear@14 668 {
nuclear@14 669 png_byte chunk_length[4];
nuclear@14 670
nuclear@14 671 if (png_ptr->buffer_size < 8)
nuclear@14 672 {
nuclear@14 673 png_push_save_buffer(png_ptr);
nuclear@14 674 return;
nuclear@14 675 }
nuclear@14 676
nuclear@14 677 png_push_fill_buffer(png_ptr, chunk_length, 4);
nuclear@14 678 png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
nuclear@14 679 png_reset_crc(png_ptr);
nuclear@14 680 png_crc_read(png_ptr, png_ptr->chunk_name, 4);
nuclear@14 681 png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
nuclear@14 682
nuclear@14 683 if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@14 684 {
nuclear@14 685 png_ptr->process_mode = PNG_READ_CHUNK_MODE;
nuclear@14 686 if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
nuclear@14 687 png_error(png_ptr, "Not enough compressed data");
nuclear@14 688 return;
nuclear@14 689 }
nuclear@14 690
nuclear@14 691 png_ptr->idat_size = png_ptr->push_length;
nuclear@14 692 }
nuclear@14 693 if (png_ptr->idat_size && png_ptr->save_buffer_size)
nuclear@14 694 {
nuclear@14 695 png_size_t save_size;
nuclear@14 696
nuclear@14 697 if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
nuclear@14 698 {
nuclear@14 699 save_size = (png_size_t)png_ptr->idat_size;
nuclear@14 700 /* check for overflow */
nuclear@14 701 if ((png_uint_32)save_size != png_ptr->idat_size)
nuclear@14 702 png_error(png_ptr, "save_size overflowed in pngpread");
nuclear@14 703 }
nuclear@14 704 else
nuclear@14 705 save_size = png_ptr->save_buffer_size;
nuclear@14 706
nuclear@14 707 png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
nuclear@14 708 if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
nuclear@14 709 png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
nuclear@14 710 png_ptr->idat_size -= save_size;
nuclear@14 711 png_ptr->buffer_size -= save_size;
nuclear@14 712 png_ptr->save_buffer_size -= save_size;
nuclear@14 713 png_ptr->save_buffer_ptr += save_size;
nuclear@14 714 }
nuclear@14 715 if (png_ptr->idat_size && png_ptr->current_buffer_size)
nuclear@14 716 {
nuclear@14 717 png_size_t save_size;
nuclear@14 718
nuclear@14 719 if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
nuclear@14 720 {
nuclear@14 721 save_size = (png_size_t)png_ptr->idat_size;
nuclear@14 722 /* check for overflow */
nuclear@14 723 if ((png_uint_32)save_size != png_ptr->idat_size)
nuclear@14 724 png_error(png_ptr, "save_size overflowed in pngpread");
nuclear@14 725 }
nuclear@14 726 else
nuclear@14 727 save_size = png_ptr->current_buffer_size;
nuclear@14 728
nuclear@14 729 png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
nuclear@14 730 if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
nuclear@14 731 png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);
nuclear@14 732
nuclear@14 733 png_ptr->idat_size -= save_size;
nuclear@14 734 png_ptr->buffer_size -= save_size;
nuclear@14 735 png_ptr->current_buffer_size -= save_size;
nuclear@14 736 png_ptr->current_buffer_ptr += save_size;
nuclear@14 737 }
nuclear@14 738 if (!png_ptr->idat_size)
nuclear@14 739 {
nuclear@14 740 if (png_ptr->buffer_size < 4)
nuclear@14 741 {
nuclear@14 742 png_push_save_buffer(png_ptr);
nuclear@14 743 return;
nuclear@14 744 }
nuclear@14 745
nuclear@14 746 png_crc_finish(png_ptr, 0);
nuclear@14 747 png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
nuclear@14 748 png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@14 749 }
nuclear@14 750 }
nuclear@14 751
nuclear@14 752 void /* PRIVATE */
nuclear@14 753 png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
nuclear@14 754 png_size_t buffer_length)
nuclear@14 755 {
nuclear@14 756 int ret;
nuclear@14 757
nuclear@14 758 if ((png_ptr->flags & PNG_FLAG_ZLIB_FINISHED) && buffer_length)
nuclear@14 759 png_error(png_ptr, "Extra compression data");
nuclear@14 760
nuclear@14 761 png_ptr->zstream.next_in = buffer;
nuclear@14 762 png_ptr->zstream.avail_in = (uInt)buffer_length;
nuclear@14 763 for (;;)
nuclear@14 764 {
nuclear@14 765 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
nuclear@14 766 if (ret != Z_OK)
nuclear@14 767 {
nuclear@14 768 if (ret == Z_STREAM_END)
nuclear@14 769 {
nuclear@14 770 if (png_ptr->zstream.avail_in)
nuclear@14 771 png_error(png_ptr, "Extra compressed data");
nuclear@14 772 if (!(png_ptr->zstream.avail_out))
nuclear@14 773 {
nuclear@14 774 png_push_process_row(png_ptr);
nuclear@14 775 }
nuclear@14 776
nuclear@14 777 png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@14 778 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
nuclear@14 779 break;
nuclear@14 780 }
nuclear@14 781 else if (ret == Z_BUF_ERROR)
nuclear@14 782 break;
nuclear@14 783 else
nuclear@14 784 png_error(png_ptr, "Decompression Error");
nuclear@14 785 }
nuclear@14 786 if (!(png_ptr->zstream.avail_out))
nuclear@14 787 {
nuclear@14 788 if ((
nuclear@14 789 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@14 790 png_ptr->interlaced && png_ptr->pass > 6) ||
nuclear@14 791 (!png_ptr->interlaced &&
nuclear@14 792 #endif
nuclear@14 793 png_ptr->row_number == png_ptr->num_rows))
nuclear@14 794 {
nuclear@14 795 if (png_ptr->zstream.avail_in)
nuclear@14 796 png_warning(png_ptr, "Too much data in IDAT chunks");
nuclear@14 797 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
nuclear@14 798 break;
nuclear@14 799 }
nuclear@14 800 png_push_process_row(png_ptr);
nuclear@14 801 png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
nuclear@14 802 png_ptr->zstream.next_out = png_ptr->row_buf;
nuclear@14 803 }
nuclear@14 804 else
nuclear@14 805 break;
nuclear@14 806 }
nuclear@14 807 }
nuclear@14 808
nuclear@14 809 void /* PRIVATE */
nuclear@14 810 png_push_process_row(png_structp png_ptr)
nuclear@14 811 {
nuclear@14 812 png_ptr->row_info.color_type = png_ptr->color_type;
nuclear@14 813 png_ptr->row_info.width = png_ptr->iwidth;
nuclear@14 814 png_ptr->row_info.channels = png_ptr->channels;
nuclear@14 815 png_ptr->row_info.bit_depth = png_ptr->bit_depth;
nuclear@14 816 png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
nuclear@14 817
nuclear@14 818 png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
nuclear@14 819 png_ptr->row_info.width);
nuclear@14 820
nuclear@14 821 png_read_filter_row(png_ptr, &(png_ptr->row_info),
nuclear@14 822 png_ptr->row_buf + 1, png_ptr->prev_row + 1,
nuclear@14 823 (int)(png_ptr->row_buf[0]));
nuclear@14 824
nuclear@14 825 png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
nuclear@14 826 png_ptr->rowbytes + 1);
nuclear@14 827
nuclear@14 828 if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
nuclear@14 829 png_do_read_transformations(png_ptr);
nuclear@14 830
nuclear@14 831 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@14 832 /* blow up interlaced rows to full size */
nuclear@14 833 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
nuclear@14 834 {
nuclear@14 835 if (png_ptr->pass < 6)
nuclear@14 836 /* old interface (pre-1.0.9):
nuclear@14 837 png_do_read_interlace(&(png_ptr->row_info),
nuclear@14 838 png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
nuclear@14 839 */
nuclear@14 840 png_do_read_interlace(png_ptr);
nuclear@14 841
nuclear@14 842 switch (png_ptr->pass)
nuclear@14 843 {
nuclear@14 844 case 0:
nuclear@14 845 {
nuclear@14 846 int i;
nuclear@14 847 for (i = 0; i < 8 && png_ptr->pass == 0; i++)
nuclear@14 848 {
nuclear@14 849 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14 850 png_read_push_finish_row(png_ptr); /* updates png_ptr->pass */
nuclear@14 851 }
nuclear@14 852 if (png_ptr->pass == 2) /* pass 1 might be empty */
nuclear@14 853 {
nuclear@14 854 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
nuclear@14 855 {
nuclear@14 856 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14 857 png_read_push_finish_row(png_ptr);
nuclear@14 858 }
nuclear@14 859 }
nuclear@14 860 if (png_ptr->pass == 4 && png_ptr->height <= 4)
nuclear@14 861 {
nuclear@14 862 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@14 863 {
nuclear@14 864 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14 865 png_read_push_finish_row(png_ptr);
nuclear@14 866 }
nuclear@14 867 }
nuclear@14 868 if (png_ptr->pass == 6 && png_ptr->height <= 4)
nuclear@14 869 {
nuclear@14 870 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14 871 png_read_push_finish_row(png_ptr);
nuclear@14 872 }
nuclear@14 873 break;
nuclear@14 874 }
nuclear@14 875 case 1:
nuclear@14 876 {
nuclear@14 877 int i;
nuclear@14 878 for (i = 0; i < 8 && png_ptr->pass == 1; i++)
nuclear@14 879 {
nuclear@14 880 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14 881 png_read_push_finish_row(png_ptr);
nuclear@14 882 }
nuclear@14 883 if (png_ptr->pass == 2) /* skip top 4 generated rows */
nuclear@14 884 {
nuclear@14 885 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
nuclear@14 886 {
nuclear@14 887 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14 888 png_read_push_finish_row(png_ptr);
nuclear@14 889 }
nuclear@14 890 }
nuclear@14 891 break;
nuclear@14 892 }
nuclear@14 893 case 2:
nuclear@14 894 {
nuclear@14 895 int i;
nuclear@14 896 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
nuclear@14 897 {
nuclear@14 898 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14 899 png_read_push_finish_row(png_ptr);
nuclear@14 900 }
nuclear@14 901 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
nuclear@14 902 {
nuclear@14 903 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14 904 png_read_push_finish_row(png_ptr);
nuclear@14 905 }
nuclear@14 906 if (png_ptr->pass == 4) /* pass 3 might be empty */
nuclear@14 907 {
nuclear@14 908 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@14 909 {
nuclear@14 910 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14 911 png_read_push_finish_row(png_ptr);
nuclear@14 912 }
nuclear@14 913 }
nuclear@14 914 break;
nuclear@14 915 }
nuclear@14 916 case 3:
nuclear@14 917 {
nuclear@14 918 int i;
nuclear@14 919 for (i = 0; i < 4 && png_ptr->pass == 3; i++)
nuclear@14 920 {
nuclear@14 921 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14 922 png_read_push_finish_row(png_ptr);
nuclear@14 923 }
nuclear@14 924 if (png_ptr->pass == 4) /* skip top two generated rows */
nuclear@14 925 {
nuclear@14 926 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@14 927 {
nuclear@14 928 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14 929 png_read_push_finish_row(png_ptr);
nuclear@14 930 }
nuclear@14 931 }
nuclear@14 932 break;
nuclear@14 933 }
nuclear@14 934 case 4:
nuclear@14 935 {
nuclear@14 936 int i;
nuclear@14 937 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@14 938 {
nuclear@14 939 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14 940 png_read_push_finish_row(png_ptr);
nuclear@14 941 }
nuclear@14 942 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@14 943 {
nuclear@14 944 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14 945 png_read_push_finish_row(png_ptr);
nuclear@14 946 }
nuclear@14 947 if (png_ptr->pass == 6) /* pass 5 might be empty */
nuclear@14 948 {
nuclear@14 949 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14 950 png_read_push_finish_row(png_ptr);
nuclear@14 951 }
nuclear@14 952 break;
nuclear@14 953 }
nuclear@14 954 case 5:
nuclear@14 955 {
nuclear@14 956 int i;
nuclear@14 957 for (i = 0; i < 2 && png_ptr->pass == 5; i++)
nuclear@14 958 {
nuclear@14 959 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14 960 png_read_push_finish_row(png_ptr);
nuclear@14 961 }
nuclear@14 962 if (png_ptr->pass == 6) /* skip top generated row */
nuclear@14 963 {
nuclear@14 964 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14 965 png_read_push_finish_row(png_ptr);
nuclear@14 966 }
nuclear@14 967 break;
nuclear@14 968 }
nuclear@14 969 case 6:
nuclear@14 970 {
nuclear@14 971 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14 972 png_read_push_finish_row(png_ptr);
nuclear@14 973 if (png_ptr->pass != 6)
nuclear@14 974 break;
nuclear@14 975 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@14 976 png_read_push_finish_row(png_ptr);
nuclear@14 977 }
nuclear@14 978 }
nuclear@14 979 }
nuclear@14 980 else
nuclear@14 981 #endif
nuclear@14 982 {
nuclear@14 983 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@14 984 png_read_push_finish_row(png_ptr);
nuclear@14 985 }
nuclear@14 986 }
nuclear@14 987
nuclear@14 988 void /* PRIVATE */
nuclear@14 989 png_read_push_finish_row(png_structp png_ptr)
nuclear@14 990 {
nuclear@14 991 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@14 992 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
nuclear@14 993
nuclear@14 994 /* start of interlace block */
nuclear@14 995 PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
nuclear@14 996
nuclear@14 997 /* offset to next interlace block */
nuclear@14 998 PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
nuclear@14 999
nuclear@14 1000 /* start of interlace block in the y direction */
nuclear@14 1001 PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
nuclear@14 1002
nuclear@14 1003 /* offset to next interlace block in the y direction */
nuclear@14 1004 PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
nuclear@14 1005
nuclear@14 1006 /* Height of interlace block. This is not currently used - if you need
nuclear@14 1007 * it, uncomment it here and in png.h
nuclear@14 1008 PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
nuclear@14 1009 */
nuclear@14 1010 #endif
nuclear@14 1011
nuclear@14 1012 png_ptr->row_number++;
nuclear@14 1013 if (png_ptr->row_number < png_ptr->num_rows)
nuclear@14 1014 return;
nuclear@14 1015
nuclear@14 1016 if (png_ptr->interlaced)
nuclear@14 1017 {
nuclear@14 1018 png_ptr->row_number = 0;
nuclear@14 1019 png_memset_check(png_ptr, png_ptr->prev_row, 0,
nuclear@14 1020 png_ptr->rowbytes + 1);
nuclear@14 1021 do
nuclear@14 1022 {
nuclear@14 1023 png_ptr->pass++;
nuclear@14 1024 if ((png_ptr->pass == 1 && png_ptr->width < 5) ||
nuclear@14 1025 (png_ptr->pass == 3 && png_ptr->width < 3) ||
nuclear@14 1026 (png_ptr->pass == 5 && png_ptr->width < 2))
nuclear@14 1027 png_ptr->pass++;
nuclear@14 1028
nuclear@14 1029 if (png_ptr->pass > 7)
nuclear@14 1030 png_ptr->pass--;
nuclear@14 1031 if (png_ptr->pass >= 7)
nuclear@14 1032 break;
nuclear@14 1033
nuclear@14 1034 png_ptr->iwidth = (png_ptr->width +
nuclear@14 1035 png_pass_inc[png_ptr->pass] - 1 -
nuclear@14 1036 png_pass_start[png_ptr->pass]) /
nuclear@14 1037 png_pass_inc[png_ptr->pass];
nuclear@14 1038
nuclear@14 1039 png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth,
nuclear@14 1040 png_ptr->iwidth) + 1;
nuclear@14 1041
nuclear@14 1042 if (png_ptr->transformations & PNG_INTERLACE)
nuclear@14 1043 break;
nuclear@14 1044
nuclear@14 1045 png_ptr->num_rows = (png_ptr->height +
nuclear@14 1046 png_pass_yinc[png_ptr->pass] - 1 -
nuclear@14 1047 png_pass_ystart[png_ptr->pass]) /
nuclear@14 1048 png_pass_yinc[png_ptr->pass];
nuclear@14 1049
nuclear@14 1050 } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
nuclear@14 1051 }
nuclear@14 1052 }
nuclear@14 1053
nuclear@14 1054 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@14 1055 void /* PRIVATE */
nuclear@14 1056 png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
nuclear@14 1057 length)
nuclear@14 1058 {
nuclear@14 1059 if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
nuclear@14 1060 {
nuclear@14 1061 png_error(png_ptr, "Out of place tEXt");
nuclear@14 1062 info_ptr = info_ptr; /* to quiet some compiler warnings */
nuclear@14 1063 }
nuclear@14 1064
nuclear@14 1065 #ifdef PNG_MAX_MALLOC_64K
nuclear@14 1066 png_ptr->skip_length = 0; /* This may not be necessary */
nuclear@14 1067
nuclear@14 1068 if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
nuclear@14 1069 {
nuclear@14 1070 png_warning(png_ptr, "tEXt chunk too large to fit in memory");
nuclear@14 1071 png_ptr->skip_length = length - (png_uint_32)65535L;
nuclear@14 1072 length = (png_uint_32)65535L;
nuclear@14 1073 }
nuclear@14 1074 #endif
nuclear@14 1075
nuclear@14 1076 png_ptr->current_text = (png_charp)png_malloc(png_ptr,
nuclear@14 1077 (png_uint_32)(length + 1));
nuclear@14 1078 png_ptr->current_text[length] = '\0';
nuclear@14 1079 png_ptr->current_text_ptr = png_ptr->current_text;
nuclear@14 1080 png_ptr->current_text_size = (png_size_t)length;
nuclear@14 1081 png_ptr->current_text_left = (png_size_t)length;
nuclear@14 1082 png_ptr->process_mode = PNG_READ_tEXt_MODE;
nuclear@14 1083 }
nuclear@14 1084
nuclear@14 1085 void /* PRIVATE */
nuclear@14 1086 png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
nuclear@14 1087 {
nuclear@14 1088 if (png_ptr->buffer_size && png_ptr->current_text_left)
nuclear@14 1089 {
nuclear@14 1090 png_size_t text_size;
nuclear@14 1091
nuclear@14 1092 if (png_ptr->buffer_size < png_ptr->current_text_left)
nuclear@14 1093 text_size = png_ptr->buffer_size;
nuclear@14 1094 else
nuclear@14 1095 text_size = png_ptr->current_text_left;
nuclear@14 1096 png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
nuclear@14 1097 png_ptr->current_text_left -= text_size;
nuclear@14 1098 png_ptr->current_text_ptr += text_size;
nuclear@14 1099 }
nuclear@14 1100 if (!(png_ptr->current_text_left))
nuclear@14 1101 {
nuclear@14 1102 png_textp text_ptr;
nuclear@14 1103 png_charp text;
nuclear@14 1104 png_charp key;
nuclear@14 1105 int ret;
nuclear@14 1106
nuclear@14 1107 if (png_ptr->buffer_size < 4)
nuclear@14 1108 {
nuclear@14 1109 png_push_save_buffer(png_ptr);
nuclear@14 1110 return;
nuclear@14 1111 }
nuclear@14 1112
nuclear@14 1113 png_push_crc_finish(png_ptr);
nuclear@14 1114
nuclear@14 1115 #if defined(PNG_MAX_MALLOC_64K)
nuclear@14 1116 if (png_ptr->skip_length)
nuclear@14 1117 return;
nuclear@14 1118 #endif
nuclear@14 1119
nuclear@14 1120 key = png_ptr->current_text;
nuclear@14 1121
nuclear@14 1122 for (text = key; *text; text++)
nuclear@14 1123 /* empty loop */ ;
nuclear@14 1124
nuclear@14 1125 if (text < key + png_ptr->current_text_size)
nuclear@14 1126 text++;
nuclear@14 1127
nuclear@14 1128 text_ptr = (png_textp)png_malloc(png_ptr,
nuclear@14 1129 (png_uint_32)png_sizeof(png_text));
nuclear@14 1130 text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
nuclear@14 1131 text_ptr->key = key;
nuclear@14 1132 #ifdef PNG_iTXt_SUPPORTED
nuclear@14 1133 text_ptr->lang = NULL;
nuclear@14 1134 text_ptr->lang_key = NULL;
nuclear@14 1135 #endif
nuclear@14 1136 text_ptr->text = text;
nuclear@14 1137
nuclear@14 1138 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
nuclear@14 1139
nuclear@14 1140 png_free(png_ptr, key);
nuclear@14 1141 png_free(png_ptr, text_ptr);
nuclear@14 1142 png_ptr->current_text = NULL;
nuclear@14 1143
nuclear@14 1144 if (ret)
nuclear@14 1145 png_warning(png_ptr, "Insufficient memory to store text chunk.");
nuclear@14 1146 }
nuclear@14 1147 }
nuclear@14 1148 #endif
nuclear@14 1149
nuclear@14 1150 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@14 1151 void /* PRIVATE */
nuclear@14 1152 png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
nuclear@14 1153 length)
nuclear@14 1154 {
nuclear@14 1155 if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
nuclear@14 1156 {
nuclear@14 1157 png_error(png_ptr, "Out of place zTXt");
nuclear@14 1158 info_ptr = info_ptr; /* to quiet some compiler warnings */
nuclear@14 1159 }
nuclear@14 1160
nuclear@14 1161 #ifdef PNG_MAX_MALLOC_64K
nuclear@14 1162 /* We can't handle zTXt chunks > 64K, since we don't have enough space
nuclear@14 1163 * to be able to store the uncompressed data. Actually, the threshold
nuclear@14 1164 * is probably around 32K, but it isn't as definite as 64K is.
nuclear@14 1165 */
nuclear@14 1166 if (length > (png_uint_32)65535L)
nuclear@14 1167 {
nuclear@14 1168 png_warning(png_ptr, "zTXt chunk too large to fit in memory");
nuclear@14 1169 png_push_crc_skip(png_ptr, length);
nuclear@14 1170 return;
nuclear@14 1171 }
nuclear@14 1172 #endif
nuclear@14 1173
nuclear@14 1174 png_ptr->current_text = (png_charp)png_malloc(png_ptr,
nuclear@14 1175 (png_uint_32)(length + 1));
nuclear@14 1176 png_ptr->current_text[length] = '\0';
nuclear@14 1177 png_ptr->current_text_ptr = png_ptr->current_text;
nuclear@14 1178 png_ptr->current_text_size = (png_size_t)length;
nuclear@14 1179 png_ptr->current_text_left = (png_size_t)length;
nuclear@14 1180 png_ptr->process_mode = PNG_READ_zTXt_MODE;
nuclear@14 1181 }
nuclear@14 1182
nuclear@14 1183 void /* PRIVATE */
nuclear@14 1184 png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
nuclear@14 1185 {
nuclear@14 1186 if (png_ptr->buffer_size && png_ptr->current_text_left)
nuclear@14 1187 {
nuclear@14 1188 png_size_t text_size;
nuclear@14 1189
nuclear@14 1190 if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left)
nuclear@14 1191 text_size = png_ptr->buffer_size;
nuclear@14 1192 else
nuclear@14 1193 text_size = png_ptr->current_text_left;
nuclear@14 1194 png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
nuclear@14 1195 png_ptr->current_text_left -= text_size;
nuclear@14 1196 png_ptr->current_text_ptr += text_size;
nuclear@14 1197 }
nuclear@14 1198 if (!(png_ptr->current_text_left))
nuclear@14 1199 {
nuclear@14 1200 png_textp text_ptr;
nuclear@14 1201 png_charp text;
nuclear@14 1202 png_charp key;
nuclear@14 1203 int ret;
nuclear@14 1204 png_size_t text_size, key_size;
nuclear@14 1205
nuclear@14 1206 if (png_ptr->buffer_size < 4)
nuclear@14 1207 {
nuclear@14 1208 png_push_save_buffer(png_ptr);
nuclear@14 1209 return;
nuclear@14 1210 }
nuclear@14 1211
nuclear@14 1212 png_push_crc_finish(png_ptr);
nuclear@14 1213
nuclear@14 1214 key = png_ptr->current_text;
nuclear@14 1215
nuclear@14 1216 for (text = key; *text; text++)
nuclear@14 1217 /* empty loop */ ;
nuclear@14 1218
nuclear@14 1219 /* zTXt can't have zero text */
nuclear@14 1220 if (text >= key + png_ptr->current_text_size)
nuclear@14 1221 {
nuclear@14 1222 png_ptr->current_text = NULL;
nuclear@14 1223 png_free(png_ptr, key);
nuclear@14 1224 return;
nuclear@14 1225 }
nuclear@14 1226
nuclear@14 1227 text++;
nuclear@14 1228
nuclear@14 1229 if (*text != PNG_TEXT_COMPRESSION_zTXt) /* check compression byte */
nuclear@14 1230 {
nuclear@14 1231 png_ptr->current_text = NULL;
nuclear@14 1232 png_free(png_ptr, key);
nuclear@14 1233 return;
nuclear@14 1234 }
nuclear@14 1235
nuclear@14 1236 text++;
nuclear@14 1237
nuclear@14 1238 png_ptr->zstream.next_in = (png_bytep )text;
nuclear@14 1239 png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size -
nuclear@14 1240 (text - key));
nuclear@14 1241 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@14 1242 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@14 1243
nuclear@14 1244 key_size = text - key;
nuclear@14 1245 text_size = 0;
nuclear@14 1246 text = NULL;
nuclear@14 1247 ret = Z_STREAM_END;
nuclear@14 1248
nuclear@14 1249 while (png_ptr->zstream.avail_in)
nuclear@14 1250 {
nuclear@14 1251 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
nuclear@14 1252 if (ret != Z_OK && ret != Z_STREAM_END)
nuclear@14 1253 {
nuclear@14 1254 inflateReset(&png_ptr->zstream);
nuclear@14 1255 png_ptr->zstream.avail_in = 0;
nuclear@14 1256 png_ptr->current_text = NULL;
nuclear@14 1257 png_free(png_ptr, key);
nuclear@14 1258 png_free(png_ptr, text);
nuclear@14 1259 return;
nuclear@14 1260 }
nuclear@14 1261 if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END)
nuclear@14 1262 {
nuclear@14 1263 if (text == NULL)
nuclear@14 1264 {
nuclear@14 1265 text = (png_charp)png_malloc(png_ptr,
nuclear@14 1266 (png_uint_32)(png_ptr->zbuf_size
nuclear@14 1267 - png_ptr->zstream.avail_out + key_size + 1));
nuclear@14 1268 png_memcpy(text + key_size, png_ptr->zbuf,
nuclear@14 1269 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
nuclear@14 1270 png_memcpy(text, key, key_size);
nuclear@14 1271 text_size = key_size + png_ptr->zbuf_size -
nuclear@14 1272 png_ptr->zstream.avail_out;
nuclear@14 1273 *(text + text_size) = '\0';
nuclear@14 1274 }
nuclear@14 1275 else
nuclear@14 1276 {
nuclear@14 1277 png_charp tmp;
nuclear@14 1278
nuclear@14 1279 tmp = text;
nuclear@14 1280 text = (png_charp)png_malloc(png_ptr, text_size +
nuclear@14 1281 (png_uint_32)(png_ptr->zbuf_size
nuclear@14 1282 - png_ptr->zstream.avail_out + 1));
nuclear@14 1283 png_memcpy(text, tmp, text_size);
nuclear@14 1284 png_free(png_ptr, tmp);
nuclear@14 1285 png_memcpy(text + text_size, png_ptr->zbuf,
nuclear@14 1286 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
nuclear@14 1287 text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
nuclear@14 1288 *(text + text_size) = '\0';
nuclear@14 1289 }
nuclear@14 1290 if (ret != Z_STREAM_END)
nuclear@14 1291 {
nuclear@14 1292 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@14 1293 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@14 1294 }
nuclear@14 1295 }
nuclear@14 1296 else
nuclear@14 1297 {
nuclear@14 1298 break;
nuclear@14 1299 }
nuclear@14 1300
nuclear@14 1301 if (ret == Z_STREAM_END)
nuclear@14 1302 break;
nuclear@14 1303 }
nuclear@14 1304
nuclear@14 1305 inflateReset(&png_ptr->zstream);
nuclear@14 1306 png_ptr->zstream.avail_in = 0;
nuclear@14 1307
nuclear@14 1308 if (ret != Z_STREAM_END)
nuclear@14 1309 {
nuclear@14 1310 png_ptr->current_text = NULL;
nuclear@14 1311 png_free(png_ptr, key);
nuclear@14 1312 png_free(png_ptr, text);
nuclear@14 1313 return;
nuclear@14 1314 }
nuclear@14 1315
nuclear@14 1316 png_ptr->current_text = NULL;
nuclear@14 1317 png_free(png_ptr, key);
nuclear@14 1318 key = text;
nuclear@14 1319 text += key_size;
nuclear@14 1320
nuclear@14 1321 text_ptr = (png_textp)png_malloc(png_ptr,
nuclear@14 1322 (png_uint_32)png_sizeof(png_text));
nuclear@14 1323 text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
nuclear@14 1324 text_ptr->key = key;
nuclear@14 1325 #ifdef PNG_iTXt_SUPPORTED
nuclear@14 1326 text_ptr->lang = NULL;
nuclear@14 1327 text_ptr->lang_key = NULL;
nuclear@14 1328 #endif
nuclear@14 1329 text_ptr->text = text;
nuclear@14 1330
nuclear@14 1331 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
nuclear@14 1332
nuclear@14 1333 png_free(png_ptr, key);
nuclear@14 1334 png_free(png_ptr, text_ptr);
nuclear@14 1335
nuclear@14 1336 if (ret)
nuclear@14 1337 png_warning(png_ptr, "Insufficient memory to store text chunk.");
nuclear@14 1338 }
nuclear@14 1339 }
nuclear@14 1340 #endif
nuclear@14 1341
nuclear@14 1342 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@14 1343 void /* PRIVATE */
nuclear@14 1344 png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
nuclear@14 1345 length)
nuclear@14 1346 {
nuclear@14 1347 if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
nuclear@14 1348 {
nuclear@14 1349 png_error(png_ptr, "Out of place iTXt");
nuclear@14 1350 info_ptr = info_ptr; /* to quiet some compiler warnings */
nuclear@14 1351 }
nuclear@14 1352
nuclear@14 1353 #ifdef PNG_MAX_MALLOC_64K
nuclear@14 1354 png_ptr->skip_length = 0; /* This may not be necessary */
nuclear@14 1355
nuclear@14 1356 if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
nuclear@14 1357 {
nuclear@14 1358 png_warning(png_ptr, "iTXt chunk too large to fit in memory");
nuclear@14 1359 png_ptr->skip_length = length - (png_uint_32)65535L;
nuclear@14 1360 length = (png_uint_32)65535L;
nuclear@14 1361 }
nuclear@14 1362 #endif
nuclear@14 1363
nuclear@14 1364 png_ptr->current_text = (png_charp)png_malloc(png_ptr,
nuclear@14 1365 (png_uint_32)(length + 1));
nuclear@14 1366 png_ptr->current_text[length] = '\0';
nuclear@14 1367 png_ptr->current_text_ptr = png_ptr->current_text;
nuclear@14 1368 png_ptr->current_text_size = (png_size_t)length;
nuclear@14 1369 png_ptr->current_text_left = (png_size_t)length;
nuclear@14 1370 png_ptr->process_mode = PNG_READ_iTXt_MODE;
nuclear@14 1371 }
nuclear@14 1372
nuclear@14 1373 void /* PRIVATE */
nuclear@14 1374 png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
nuclear@14 1375 {
nuclear@14 1376
nuclear@14 1377 if (png_ptr->buffer_size && png_ptr->current_text_left)
nuclear@14 1378 {
nuclear@14 1379 png_size_t text_size;
nuclear@14 1380
nuclear@14 1381 if (png_ptr->buffer_size < png_ptr->current_text_left)
nuclear@14 1382 text_size = png_ptr->buffer_size;
nuclear@14 1383 else
nuclear@14 1384 text_size = png_ptr->current_text_left;
nuclear@14 1385 png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
nuclear@14 1386 png_ptr->current_text_left -= text_size;
nuclear@14 1387 png_ptr->current_text_ptr += text_size;
nuclear@14 1388 }
nuclear@14 1389 if (!(png_ptr->current_text_left))
nuclear@14 1390 {
nuclear@14 1391 png_textp text_ptr;
nuclear@14 1392 png_charp key;
nuclear@14 1393 int comp_flag;
nuclear@14 1394 png_charp lang;
nuclear@14 1395 png_charp lang_key;
nuclear@14 1396 png_charp text;
nuclear@14 1397 int ret;
nuclear@14 1398
nuclear@14 1399 if (png_ptr->buffer_size < 4)
nuclear@14 1400 {
nuclear@14 1401 png_push_save_buffer(png_ptr);
nuclear@14 1402 return;
nuclear@14 1403 }
nuclear@14 1404
nuclear@14 1405 png_push_crc_finish(png_ptr);
nuclear@14 1406
nuclear@14 1407 #if defined(PNG_MAX_MALLOC_64K)
nuclear@14 1408 if (png_ptr->skip_length)
nuclear@14 1409 return;
nuclear@14 1410 #endif
nuclear@14 1411
nuclear@14 1412 key = png_ptr->current_text;
nuclear@14 1413
nuclear@14 1414 for (lang = key; *lang; lang++)
nuclear@14 1415 /* empty loop */ ;
nuclear@14 1416
nuclear@14 1417 if (lang < key + png_ptr->current_text_size - 3)
nuclear@14 1418 lang++;
nuclear@14 1419
nuclear@14 1420 comp_flag = *lang++;
nuclear@14 1421 lang++; /* skip comp_type, always zero */
nuclear@14 1422
nuclear@14 1423 for (lang_key = lang; *lang_key; lang_key++)
nuclear@14 1424 /* empty loop */ ;
nuclear@14 1425 lang_key++; /* skip NUL separator */
nuclear@14 1426
nuclear@14 1427 text=lang_key;
nuclear@14 1428 if (lang_key < key + png_ptr->current_text_size - 1)
nuclear@14 1429 {
nuclear@14 1430 for (; *text; text++)
nuclear@14 1431 /* empty loop */ ;
nuclear@14 1432 }
nuclear@14 1433
nuclear@14 1434 if (text < key + png_ptr->current_text_size)
nuclear@14 1435 text++;
nuclear@14 1436
nuclear@14 1437 text_ptr = (png_textp)png_malloc(png_ptr,
nuclear@14 1438 (png_uint_32)png_sizeof(png_text));
nuclear@14 1439 text_ptr->compression = comp_flag + 2;
nuclear@14 1440 text_ptr->key = key;
nuclear@14 1441 text_ptr->lang = lang;
nuclear@14 1442 text_ptr->lang_key = lang_key;
nuclear@14 1443 text_ptr->text = text;
nuclear@14 1444 text_ptr->text_length = 0;
nuclear@14 1445 text_ptr->itxt_length = png_strlen(text);
nuclear@14 1446
nuclear@14 1447 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
nuclear@14 1448
nuclear@14 1449 png_ptr->current_text = NULL;
nuclear@14 1450
nuclear@14 1451 png_free(png_ptr, text_ptr);
nuclear@14 1452 if (ret)
nuclear@14 1453 png_warning(png_ptr, "Insufficient memory to store iTXt chunk.");
nuclear@14 1454 }
nuclear@14 1455 }
nuclear@14 1456 #endif
nuclear@14 1457
nuclear@14 1458 /* This function is called when we haven't found a handler for this
nuclear@14 1459 * chunk. If there isn't a problem with the chunk itself (ie a bad chunk
nuclear@14 1460 * name or a critical chunk), the chunk is (currently) silently ignored.
nuclear@14 1461 */
nuclear@14 1462 void /* PRIVATE */
nuclear@14 1463 png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
nuclear@14 1464 length)
nuclear@14 1465 {
nuclear@14 1466 png_uint_32 skip = 0;
nuclear@14 1467
nuclear@14 1468 if (!(png_ptr->chunk_name[0] & 0x20))
nuclear@14 1469 {
nuclear@14 1470 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@14 1471 if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
nuclear@14 1472 PNG_HANDLE_CHUNK_ALWAYS
nuclear@14 1473 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
nuclear@14 1474 && png_ptr->read_user_chunk_fn == NULL
nuclear@14 1475 #endif
nuclear@14 1476 )
nuclear@14 1477 #endif
nuclear@14 1478 png_chunk_error(png_ptr, "unknown critical chunk");
nuclear@14 1479
nuclear@14 1480 info_ptr = info_ptr; /* to quiet some compiler warnings */
nuclear@14 1481 }
nuclear@14 1482
nuclear@14 1483 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@14 1484 if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
nuclear@14 1485 {
nuclear@14 1486 #ifdef PNG_MAX_MALLOC_64K
nuclear@14 1487 if (length > (png_uint_32)65535L)
nuclear@14 1488 {
nuclear@14 1489 png_warning(png_ptr, "unknown chunk too large to fit in memory");
nuclear@14 1490 skip = length - (png_uint_32)65535L;
nuclear@14 1491 length = (png_uint_32)65535L;
nuclear@14 1492 }
nuclear@14 1493 #endif
nuclear@14 1494 png_memcpy((png_charp)png_ptr->unknown_chunk.name,
nuclear@14 1495 (png_charp)png_ptr->chunk_name,
nuclear@14 1496 png_sizeof(png_ptr->unknown_chunk.name));
nuclear@14 1497 png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name) - 1]
nuclear@14 1498 = '\0';
nuclear@14 1499
nuclear@14 1500 png_ptr->unknown_chunk.size = (png_size_t)length;
nuclear@14 1501 if (length == 0)
nuclear@14 1502 png_ptr->unknown_chunk.data = NULL;
nuclear@14 1503 else
nuclear@14 1504 {
nuclear@14 1505 png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr,
nuclear@14 1506 (png_uint_32)length);
nuclear@14 1507 png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
nuclear@14 1508 }
nuclear@14 1509 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
nuclear@14 1510 if (png_ptr->read_user_chunk_fn != NULL)
nuclear@14 1511 {
nuclear@14 1512 /* callback to user unknown chunk handler */
nuclear@14 1513 int ret;
nuclear@14 1514 ret = (*(png_ptr->read_user_chunk_fn))
nuclear@14 1515 (png_ptr, &png_ptr->unknown_chunk);
nuclear@14 1516 if (ret < 0)
nuclear@14 1517 png_chunk_error(png_ptr, "error in user chunk");
nuclear@14 1518 if (ret == 0)
nuclear@14 1519 {
nuclear@14 1520 if (!(png_ptr->chunk_name[0] & 0x20))
nuclear@14 1521 if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
nuclear@14 1522 PNG_HANDLE_CHUNK_ALWAYS)
nuclear@14 1523 png_chunk_error(png_ptr, "unknown critical chunk");
nuclear@14 1524 png_set_unknown_chunks(png_ptr, info_ptr,
nuclear@14 1525 &png_ptr->unknown_chunk, 1);
nuclear@14 1526 }
nuclear@14 1527 }
nuclear@14 1528 else
nuclear@14 1529 #endif
nuclear@14 1530 png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
nuclear@14 1531 png_free(png_ptr, png_ptr->unknown_chunk.data);
nuclear@14 1532 png_ptr->unknown_chunk.data = NULL;
nuclear@14 1533 }
nuclear@14 1534 else
nuclear@14 1535 #endif
nuclear@14 1536 skip=length;
nuclear@14 1537 png_push_crc_skip(png_ptr, skip);
nuclear@14 1538 }
nuclear@14 1539
nuclear@14 1540 void /* PRIVATE */
nuclear@14 1541 png_push_have_info(png_structp png_ptr, png_infop info_ptr)
nuclear@14 1542 {
nuclear@14 1543 if (png_ptr->info_fn != NULL)
nuclear@14 1544 (*(png_ptr->info_fn))(png_ptr, info_ptr);
nuclear@14 1545 }
nuclear@14 1546
nuclear@14 1547 void /* PRIVATE */
nuclear@14 1548 png_push_have_end(png_structp png_ptr, png_infop info_ptr)
nuclear@14 1549 {
nuclear@14 1550 if (png_ptr->end_fn != NULL)
nuclear@14 1551 (*(png_ptr->end_fn))(png_ptr, info_ptr);
nuclear@14 1552 }
nuclear@14 1553
nuclear@14 1554 void /* PRIVATE */
nuclear@14 1555 png_push_have_row(png_structp png_ptr, png_bytep row)
nuclear@14 1556 {
nuclear@14 1557 if (png_ptr->row_fn != NULL)
nuclear@14 1558 (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number,
nuclear@14 1559 (int)png_ptr->pass);
nuclear@14 1560 }
nuclear@14 1561
nuclear@14 1562 void PNGAPI
nuclear@14 1563 png_progressive_combine_row (png_structp png_ptr,
nuclear@14 1564 png_bytep old_row, png_bytep new_row)
nuclear@14 1565 {
nuclear@14 1566 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@14 1567 PNG_CONST int FARDATA png_pass_dsp_mask[7] =
nuclear@14 1568 {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
nuclear@14 1569 #endif
nuclear@14 1570 if (png_ptr == NULL) return;
nuclear@14 1571 if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */
nuclear@14 1572 png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
nuclear@14 1573 }
nuclear@14 1574
nuclear@14 1575 void PNGAPI
nuclear@14 1576 png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
nuclear@14 1577 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
nuclear@14 1578 png_progressive_end_ptr end_fn)
nuclear@14 1579 {
nuclear@14 1580 if (png_ptr == NULL) return;
nuclear@14 1581 png_ptr->info_fn = info_fn;
nuclear@14 1582 png_ptr->row_fn = row_fn;
nuclear@14 1583 png_ptr->end_fn = end_fn;
nuclear@14 1584
nuclear@14 1585 png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
nuclear@14 1586 }
nuclear@14 1587
nuclear@14 1588 png_voidp PNGAPI
nuclear@14 1589 png_get_progressive_ptr(png_structp png_ptr)
nuclear@14 1590 {
nuclear@14 1591 if (png_ptr == NULL) return (NULL);
nuclear@14 1592 return png_ptr->io_ptr;
nuclear@14 1593 }
nuclear@14 1594 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */