dbf-halloween2015

annotate libs/libpng/pngpread.c @ 1:c3f5c32cb210

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barfed all the libraries in the source tree to make porting easier
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 01 Nov 2015 00:36:56 +0200
parents
children
rev   line source
nuclear@1 1
nuclear@1 2 /* pngpread.c - read a png file in push mode
nuclear@1 3 *
nuclear@1 4 * Last changed in libpng 1.2.32 [September 18, 2008]
nuclear@1 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@1 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@1 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@1 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@1 9 */
nuclear@1 10
nuclear@1 11 #define PNG_INTERNAL
nuclear@1 12 #include "png.h"
nuclear@1 13 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@1 14
nuclear@1 15 /* push model modes */
nuclear@1 16 #define PNG_READ_SIG_MODE 0
nuclear@1 17 #define PNG_READ_CHUNK_MODE 1
nuclear@1 18 #define PNG_READ_IDAT_MODE 2
nuclear@1 19 #define PNG_SKIP_MODE 3
nuclear@1 20 #define PNG_READ_tEXt_MODE 4
nuclear@1 21 #define PNG_READ_zTXt_MODE 5
nuclear@1 22 #define PNG_READ_DONE_MODE 6
nuclear@1 23 #define PNG_READ_iTXt_MODE 7
nuclear@1 24 #define PNG_ERROR_MODE 8
nuclear@1 25
nuclear@1 26 void PNGAPI
nuclear@1 27 png_process_data(png_structp png_ptr, png_infop info_ptr,
nuclear@1 28 png_bytep buffer, png_size_t buffer_size)
nuclear@1 29 {
nuclear@1 30 if (png_ptr == NULL || info_ptr == NULL) return;
nuclear@1 31 png_push_restore_buffer(png_ptr, buffer, buffer_size);
nuclear@1 32
nuclear@1 33 while (png_ptr->buffer_size)
nuclear@1 34 {
nuclear@1 35 png_process_some_data(png_ptr, info_ptr);
nuclear@1 36 }
nuclear@1 37 }
nuclear@1 38
nuclear@1 39 /* What we do with the incoming data depends on what we were previously
nuclear@1 40 * doing before we ran out of data...
nuclear@1 41 */
nuclear@1 42 void /* PRIVATE */
nuclear@1 43 png_process_some_data(png_structp png_ptr, png_infop info_ptr)
nuclear@1 44 {
nuclear@1 45 if (png_ptr == NULL) return;
nuclear@1 46 switch (png_ptr->process_mode)
nuclear@1 47 {
nuclear@1 48 case PNG_READ_SIG_MODE:
nuclear@1 49 {
nuclear@1 50 png_push_read_sig(png_ptr, info_ptr);
nuclear@1 51 break;
nuclear@1 52 }
nuclear@1 53 case PNG_READ_CHUNK_MODE:
nuclear@1 54 {
nuclear@1 55 png_push_read_chunk(png_ptr, info_ptr);
nuclear@1 56 break;
nuclear@1 57 }
nuclear@1 58 case PNG_READ_IDAT_MODE:
nuclear@1 59 {
nuclear@1 60 png_push_read_IDAT(png_ptr);
nuclear@1 61 break;
nuclear@1 62 }
nuclear@1 63 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@1 64 case PNG_READ_tEXt_MODE:
nuclear@1 65 {
nuclear@1 66 png_push_read_tEXt(png_ptr, info_ptr);
nuclear@1 67 break;
nuclear@1 68 }
nuclear@1 69 #endif
nuclear@1 70 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@1 71 case PNG_READ_zTXt_MODE:
nuclear@1 72 {
nuclear@1 73 png_push_read_zTXt(png_ptr, info_ptr);
nuclear@1 74 break;
nuclear@1 75 }
nuclear@1 76 #endif
nuclear@1 77 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@1 78 case PNG_READ_iTXt_MODE:
nuclear@1 79 {
nuclear@1 80 png_push_read_iTXt(png_ptr, info_ptr);
nuclear@1 81 break;
nuclear@1 82 }
nuclear@1 83 #endif
nuclear@1 84 case PNG_SKIP_MODE:
nuclear@1 85 {
nuclear@1 86 png_push_crc_finish(png_ptr);
nuclear@1 87 break;
nuclear@1 88 }
nuclear@1 89 default:
nuclear@1 90 {
nuclear@1 91 png_ptr->buffer_size = 0;
nuclear@1 92 break;
nuclear@1 93 }
nuclear@1 94 }
nuclear@1 95 }
nuclear@1 96
nuclear@1 97 /* Read any remaining signature bytes from the stream and compare them with
nuclear@1 98 * the correct PNG signature. It is possible that this routine is called
nuclear@1 99 * with bytes already read from the signature, either because they have been
nuclear@1 100 * checked by the calling application, or because of multiple calls to this
nuclear@1 101 * routine.
nuclear@1 102 */
nuclear@1 103 void /* PRIVATE */
nuclear@1 104 png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
nuclear@1 105 {
nuclear@1 106 png_size_t num_checked = png_ptr->sig_bytes,
nuclear@1 107 num_to_check = 8 - num_checked;
nuclear@1 108
nuclear@1 109 if (png_ptr->buffer_size < num_to_check)
nuclear@1 110 {
nuclear@1 111 num_to_check = png_ptr->buffer_size;
nuclear@1 112 }
nuclear@1 113
nuclear@1 114 png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]),
nuclear@1 115 num_to_check);
nuclear@1 116 png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes + num_to_check);
nuclear@1 117
nuclear@1 118 if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
nuclear@1 119 {
nuclear@1 120 if (num_checked < 4 &&
nuclear@1 121 png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
nuclear@1 122 png_error(png_ptr, "Not a PNG file");
nuclear@1 123 else
nuclear@1 124 png_error(png_ptr, "PNG file corrupted by ASCII conversion");
nuclear@1 125 }
nuclear@1 126 else
nuclear@1 127 {
nuclear@1 128 if (png_ptr->sig_bytes >= 8)
nuclear@1 129 {
nuclear@1 130 png_ptr->process_mode = PNG_READ_CHUNK_MODE;
nuclear@1 131 }
nuclear@1 132 }
nuclear@1 133 }
nuclear@1 134
nuclear@1 135 void /* PRIVATE */
nuclear@1 136 png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
nuclear@1 137 {
nuclear@1 138 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@1 139 PNG_CONST PNG_IHDR;
nuclear@1 140 PNG_CONST PNG_IDAT;
nuclear@1 141 PNG_CONST PNG_IEND;
nuclear@1 142 PNG_CONST PNG_PLTE;
nuclear@1 143 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@1 144 PNG_CONST PNG_bKGD;
nuclear@1 145 #endif
nuclear@1 146 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@1 147 PNG_CONST PNG_cHRM;
nuclear@1 148 #endif
nuclear@1 149 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@1 150 PNG_CONST PNG_gAMA;
nuclear@1 151 #endif
nuclear@1 152 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@1 153 PNG_CONST PNG_hIST;
nuclear@1 154 #endif
nuclear@1 155 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@1 156 PNG_CONST PNG_iCCP;
nuclear@1 157 #endif
nuclear@1 158 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@1 159 PNG_CONST PNG_iTXt;
nuclear@1 160 #endif
nuclear@1 161 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@1 162 PNG_CONST PNG_oFFs;
nuclear@1 163 #endif
nuclear@1 164 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@1 165 PNG_CONST PNG_pCAL;
nuclear@1 166 #endif
nuclear@1 167 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@1 168 PNG_CONST PNG_pHYs;
nuclear@1 169 #endif
nuclear@1 170 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@1 171 PNG_CONST PNG_sBIT;
nuclear@1 172 #endif
nuclear@1 173 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@1 174 PNG_CONST PNG_sCAL;
nuclear@1 175 #endif
nuclear@1 176 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@1 177 PNG_CONST PNG_sRGB;
nuclear@1 178 #endif
nuclear@1 179 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@1 180 PNG_CONST PNG_sPLT;
nuclear@1 181 #endif
nuclear@1 182 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@1 183 PNG_CONST PNG_tEXt;
nuclear@1 184 #endif
nuclear@1 185 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@1 186 PNG_CONST PNG_tIME;
nuclear@1 187 #endif
nuclear@1 188 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@1 189 PNG_CONST PNG_tRNS;
nuclear@1 190 #endif
nuclear@1 191 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@1 192 PNG_CONST PNG_zTXt;
nuclear@1 193 #endif
nuclear@1 194 #endif /* PNG_USE_LOCAL_ARRAYS */
nuclear@1 195 /* First we make sure we have enough data for the 4 byte chunk name
nuclear@1 196 * and the 4 byte chunk length before proceeding with decoding the
nuclear@1 197 * chunk data. To fully decode each of these chunks, we also make
nuclear@1 198 * sure we have enough data in the buffer for the 4 byte CRC at the
nuclear@1 199 * end of every chunk (except IDAT, which is handled separately).
nuclear@1 200 */
nuclear@1 201 if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
nuclear@1 202 {
nuclear@1 203 png_byte chunk_length[4];
nuclear@1 204
nuclear@1 205 if (png_ptr->buffer_size < 8)
nuclear@1 206 {
nuclear@1 207 png_push_save_buffer(png_ptr);
nuclear@1 208 return;
nuclear@1 209 }
nuclear@1 210
nuclear@1 211 png_push_fill_buffer(png_ptr, chunk_length, 4);
nuclear@1 212 png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
nuclear@1 213 png_reset_crc(png_ptr);
nuclear@1 214 png_crc_read(png_ptr, png_ptr->chunk_name, 4);
nuclear@1 215 png_check_chunk_name(png_ptr, png_ptr->chunk_name);
nuclear@1 216 png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
nuclear@1 217 }
nuclear@1 218
nuclear@1 219 if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@1 220 if (png_ptr->mode & PNG_AFTER_IDAT)
nuclear@1 221 png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
nuclear@1 222
nuclear@1 223 if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
nuclear@1 224 {
nuclear@1 225 if (png_ptr->push_length != 13)
nuclear@1 226 png_error(png_ptr, "Invalid IHDR length");
nuclear@1 227 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 228 {
nuclear@1 229 png_push_save_buffer(png_ptr);
nuclear@1 230 return;
nuclear@1 231 }
nuclear@1 232 png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 233 }
nuclear@1 234 else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
nuclear@1 235 {
nuclear@1 236 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 237 {
nuclear@1 238 png_push_save_buffer(png_ptr);
nuclear@1 239 return;
nuclear@1 240 }
nuclear@1 241 png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 242
nuclear@1 243 png_ptr->process_mode = PNG_READ_DONE_MODE;
nuclear@1 244 png_push_have_end(png_ptr, info_ptr);
nuclear@1 245 }
nuclear@1 246 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@1 247 else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
nuclear@1 248 {
nuclear@1 249 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 250 {
nuclear@1 251 png_push_save_buffer(png_ptr);
nuclear@1 252 return;
nuclear@1 253 }
nuclear@1 254 if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@1 255 png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@1 256 png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 257 if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
nuclear@1 258 png_ptr->mode |= PNG_HAVE_PLTE;
nuclear@1 259 else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@1 260 {
nuclear@1 261 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@1 262 png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@1 263 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@1 264 !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@1 265 png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@1 266 }
nuclear@1 267 }
nuclear@1 268 #endif
nuclear@1 269 else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
nuclear@1 270 {
nuclear@1 271 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 272 {
nuclear@1 273 png_push_save_buffer(png_ptr);
nuclear@1 274 return;
nuclear@1 275 }
nuclear@1 276 png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 277 }
nuclear@1 278 else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@1 279 {
nuclear@1 280 /* If we reach an IDAT chunk, this means we have read all of the
nuclear@1 281 * header chunks, and we can start reading the image (or if this
nuclear@1 282 * is called after the image has been read - we have an error).
nuclear@1 283 */
nuclear@1 284 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@1 285 png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@1 286 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@1 287 !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@1 288 png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@1 289
nuclear@1 290 if (png_ptr->mode & PNG_HAVE_IDAT)
nuclear@1 291 {
nuclear@1 292 if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
nuclear@1 293 if (png_ptr->push_length == 0)
nuclear@1 294 return;
nuclear@1 295
nuclear@1 296 if (png_ptr->mode & PNG_AFTER_IDAT)
nuclear@1 297 png_error(png_ptr, "Too many IDAT's found");
nuclear@1 298 }
nuclear@1 299
nuclear@1 300 png_ptr->idat_size = png_ptr->push_length;
nuclear@1 301 png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@1 302 png_ptr->process_mode = PNG_READ_IDAT_MODE;
nuclear@1 303 png_push_have_info(png_ptr, info_ptr);
nuclear@1 304 png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
nuclear@1 305 png_ptr->zstream.next_out = png_ptr->row_buf;
nuclear@1 306 return;
nuclear@1 307 }
nuclear@1 308 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@1 309 else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
nuclear@1 310 {
nuclear@1 311 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 312 {
nuclear@1 313 png_push_save_buffer(png_ptr);
nuclear@1 314 return;
nuclear@1 315 }
nuclear@1 316 png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 317 }
nuclear@1 318 #endif
nuclear@1 319 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@1 320 else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
nuclear@1 321 {
nuclear@1 322 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 323 {
nuclear@1 324 png_push_save_buffer(png_ptr);
nuclear@1 325 return;
nuclear@1 326 }
nuclear@1 327 png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 328 }
nuclear@1 329 #endif
nuclear@1 330 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@1 331 else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
nuclear@1 332 {
nuclear@1 333 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 334 {
nuclear@1 335 png_push_save_buffer(png_ptr);
nuclear@1 336 return;
nuclear@1 337 }
nuclear@1 338 png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 339 }
nuclear@1 340 #endif
nuclear@1 341 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@1 342 else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
nuclear@1 343 {
nuclear@1 344 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 345 {
nuclear@1 346 png_push_save_buffer(png_ptr);
nuclear@1 347 return;
nuclear@1 348 }
nuclear@1 349 png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 350 }
nuclear@1 351 #endif
nuclear@1 352 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@1 353 else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
nuclear@1 354 {
nuclear@1 355 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 356 {
nuclear@1 357 png_push_save_buffer(png_ptr);
nuclear@1 358 return;
nuclear@1 359 }
nuclear@1 360 png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 361 }
nuclear@1 362 #endif
nuclear@1 363 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@1 364 else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
nuclear@1 365 {
nuclear@1 366 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 367 {
nuclear@1 368 png_push_save_buffer(png_ptr);
nuclear@1 369 return;
nuclear@1 370 }
nuclear@1 371 png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 372 }
nuclear@1 373 #endif
nuclear@1 374 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@1 375 else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
nuclear@1 376 {
nuclear@1 377 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 378 {
nuclear@1 379 png_push_save_buffer(png_ptr);
nuclear@1 380 return;
nuclear@1 381 }
nuclear@1 382 png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 383 }
nuclear@1 384 #endif
nuclear@1 385 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@1 386 else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
nuclear@1 387 {
nuclear@1 388 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 389 {
nuclear@1 390 png_push_save_buffer(png_ptr);
nuclear@1 391 return;
nuclear@1 392 }
nuclear@1 393 png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 394 }
nuclear@1 395 #endif
nuclear@1 396 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@1 397 else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
nuclear@1 398 {
nuclear@1 399 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 400 {
nuclear@1 401 png_push_save_buffer(png_ptr);
nuclear@1 402 return;
nuclear@1 403 }
nuclear@1 404 png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 405 }
nuclear@1 406 #endif
nuclear@1 407 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@1 408 else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
nuclear@1 409 {
nuclear@1 410 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 411 {
nuclear@1 412 png_push_save_buffer(png_ptr);
nuclear@1 413 return;
nuclear@1 414 }
nuclear@1 415 png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 416 }
nuclear@1 417 #endif
nuclear@1 418 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@1 419 else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
nuclear@1 420 {
nuclear@1 421 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 422 {
nuclear@1 423 png_push_save_buffer(png_ptr);
nuclear@1 424 return;
nuclear@1 425 }
nuclear@1 426 png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 427 }
nuclear@1 428 #endif
nuclear@1 429 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@1 430 else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
nuclear@1 431 {
nuclear@1 432 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 433 {
nuclear@1 434 png_push_save_buffer(png_ptr);
nuclear@1 435 return;
nuclear@1 436 }
nuclear@1 437 png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 438 }
nuclear@1 439 #endif
nuclear@1 440 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@1 441 else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
nuclear@1 442 {
nuclear@1 443 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 444 {
nuclear@1 445 png_push_save_buffer(png_ptr);
nuclear@1 446 return;
nuclear@1 447 }
nuclear@1 448 png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 449 }
nuclear@1 450 #endif
nuclear@1 451 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@1 452 else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
nuclear@1 453 {
nuclear@1 454 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 455 {
nuclear@1 456 png_push_save_buffer(png_ptr);
nuclear@1 457 return;
nuclear@1 458 }
nuclear@1 459 png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 460 }
nuclear@1 461 #endif
nuclear@1 462 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@1 463 else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
nuclear@1 464 {
nuclear@1 465 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 466 {
nuclear@1 467 png_push_save_buffer(png_ptr);
nuclear@1 468 return;
nuclear@1 469 }
nuclear@1 470 png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 471 }
nuclear@1 472 #endif
nuclear@1 473 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@1 474 else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
nuclear@1 475 {
nuclear@1 476 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 477 {
nuclear@1 478 png_push_save_buffer(png_ptr);
nuclear@1 479 return;
nuclear@1 480 }
nuclear@1 481 png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 482 }
nuclear@1 483 #endif
nuclear@1 484 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@1 485 else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
nuclear@1 486 {
nuclear@1 487 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 488 {
nuclear@1 489 png_push_save_buffer(png_ptr);
nuclear@1 490 return;
nuclear@1 491 }
nuclear@1 492 png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 493 }
nuclear@1 494 #endif
nuclear@1 495 else
nuclear@1 496 {
nuclear@1 497 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
nuclear@1 498 {
nuclear@1 499 png_push_save_buffer(png_ptr);
nuclear@1 500 return;
nuclear@1 501 }
nuclear@1 502 png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
nuclear@1 503 }
nuclear@1 504
nuclear@1 505 png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
nuclear@1 506 }
nuclear@1 507
nuclear@1 508 void /* PRIVATE */
nuclear@1 509 png_push_crc_skip(png_structp png_ptr, png_uint_32 skip)
nuclear@1 510 {
nuclear@1 511 png_ptr->process_mode = PNG_SKIP_MODE;
nuclear@1 512 png_ptr->skip_length = skip;
nuclear@1 513 }
nuclear@1 514
nuclear@1 515 void /* PRIVATE */
nuclear@1 516 png_push_crc_finish(png_structp png_ptr)
nuclear@1 517 {
nuclear@1 518 if (png_ptr->skip_length && png_ptr->save_buffer_size)
nuclear@1 519 {
nuclear@1 520 png_size_t save_size;
nuclear@1 521
nuclear@1 522 if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size)
nuclear@1 523 save_size = (png_size_t)png_ptr->skip_length;
nuclear@1 524 else
nuclear@1 525 save_size = png_ptr->save_buffer_size;
nuclear@1 526
nuclear@1 527 png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
nuclear@1 528
nuclear@1 529 png_ptr->skip_length -= save_size;
nuclear@1 530 png_ptr->buffer_size -= save_size;
nuclear@1 531 png_ptr->save_buffer_size -= save_size;
nuclear@1 532 png_ptr->save_buffer_ptr += save_size;
nuclear@1 533 }
nuclear@1 534 if (png_ptr->skip_length && png_ptr->current_buffer_size)
nuclear@1 535 {
nuclear@1 536 png_size_t save_size;
nuclear@1 537
nuclear@1 538 if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size)
nuclear@1 539 save_size = (png_size_t)png_ptr->skip_length;
nuclear@1 540 else
nuclear@1 541 save_size = png_ptr->current_buffer_size;
nuclear@1 542
nuclear@1 543 png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
nuclear@1 544
nuclear@1 545 png_ptr->skip_length -= save_size;
nuclear@1 546 png_ptr->buffer_size -= save_size;
nuclear@1 547 png_ptr->current_buffer_size -= save_size;
nuclear@1 548 png_ptr->current_buffer_ptr += save_size;
nuclear@1 549 }
nuclear@1 550 if (!png_ptr->skip_length)
nuclear@1 551 {
nuclear@1 552 if (png_ptr->buffer_size < 4)
nuclear@1 553 {
nuclear@1 554 png_push_save_buffer(png_ptr);
nuclear@1 555 return;
nuclear@1 556 }
nuclear@1 557
nuclear@1 558 png_crc_finish(png_ptr, 0);
nuclear@1 559 png_ptr->process_mode = PNG_READ_CHUNK_MODE;
nuclear@1 560 }
nuclear@1 561 }
nuclear@1 562
nuclear@1 563 void PNGAPI
nuclear@1 564 png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
nuclear@1 565 {
nuclear@1 566 png_bytep ptr;
nuclear@1 567
nuclear@1 568 if (png_ptr == NULL) return;
nuclear@1 569 ptr = buffer;
nuclear@1 570 if (png_ptr->save_buffer_size)
nuclear@1 571 {
nuclear@1 572 png_size_t save_size;
nuclear@1 573
nuclear@1 574 if (length < png_ptr->save_buffer_size)
nuclear@1 575 save_size = length;
nuclear@1 576 else
nuclear@1 577 save_size = png_ptr->save_buffer_size;
nuclear@1 578
nuclear@1 579 png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size);
nuclear@1 580 length -= save_size;
nuclear@1 581 ptr += save_size;
nuclear@1 582 png_ptr->buffer_size -= save_size;
nuclear@1 583 png_ptr->save_buffer_size -= save_size;
nuclear@1 584 png_ptr->save_buffer_ptr += save_size;
nuclear@1 585 }
nuclear@1 586 if (length && png_ptr->current_buffer_size)
nuclear@1 587 {
nuclear@1 588 png_size_t save_size;
nuclear@1 589
nuclear@1 590 if (length < png_ptr->current_buffer_size)
nuclear@1 591 save_size = length;
nuclear@1 592 else
nuclear@1 593 save_size = png_ptr->current_buffer_size;
nuclear@1 594
nuclear@1 595 png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size);
nuclear@1 596 png_ptr->buffer_size -= save_size;
nuclear@1 597 png_ptr->current_buffer_size -= save_size;
nuclear@1 598 png_ptr->current_buffer_ptr += save_size;
nuclear@1 599 }
nuclear@1 600 }
nuclear@1 601
nuclear@1 602 void /* PRIVATE */
nuclear@1 603 png_push_save_buffer(png_structp png_ptr)
nuclear@1 604 {
nuclear@1 605 if (png_ptr->save_buffer_size)
nuclear@1 606 {
nuclear@1 607 if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
nuclear@1 608 {
nuclear@1 609 png_size_t i, istop;
nuclear@1 610 png_bytep sp;
nuclear@1 611 png_bytep dp;
nuclear@1 612
nuclear@1 613 istop = png_ptr->save_buffer_size;
nuclear@1 614 for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer;
nuclear@1 615 i < istop; i++, sp++, dp++)
nuclear@1 616 {
nuclear@1 617 *dp = *sp;
nuclear@1 618 }
nuclear@1 619 }
nuclear@1 620 }
nuclear@1 621 if (png_ptr->save_buffer_size + png_ptr->current_buffer_size >
nuclear@1 622 png_ptr->save_buffer_max)
nuclear@1 623 {
nuclear@1 624 png_size_t new_max;
nuclear@1 625 png_bytep old_buffer;
nuclear@1 626
nuclear@1 627 if (png_ptr->save_buffer_size > PNG_SIZE_MAX -
nuclear@1 628 (png_ptr->current_buffer_size + 256))
nuclear@1 629 {
nuclear@1 630 png_error(png_ptr, "Potential overflow of save_buffer");
nuclear@1 631 }
nuclear@1 632 new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
nuclear@1 633 old_buffer = png_ptr->save_buffer;
nuclear@1 634 png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr,
nuclear@1 635 (png_uint_32)new_max);
nuclear@1 636 png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
nuclear@1 637 png_free(png_ptr, old_buffer);
nuclear@1 638 png_ptr->save_buffer_max = new_max;
nuclear@1 639 }
nuclear@1 640 if (png_ptr->current_buffer_size)
nuclear@1 641 {
nuclear@1 642 png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size,
nuclear@1 643 png_ptr->current_buffer_ptr, png_ptr->current_buffer_size);
nuclear@1 644 png_ptr->save_buffer_size += png_ptr->current_buffer_size;
nuclear@1 645 png_ptr->current_buffer_size = 0;
nuclear@1 646 }
nuclear@1 647 png_ptr->save_buffer_ptr = png_ptr->save_buffer;
nuclear@1 648 png_ptr->buffer_size = 0;
nuclear@1 649 }
nuclear@1 650
nuclear@1 651 void /* PRIVATE */
nuclear@1 652 png_push_restore_buffer(png_structp png_ptr, png_bytep buffer,
nuclear@1 653 png_size_t buffer_length)
nuclear@1 654 {
nuclear@1 655 png_ptr->current_buffer = buffer;
nuclear@1 656 png_ptr->current_buffer_size = buffer_length;
nuclear@1 657 png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size;
nuclear@1 658 png_ptr->current_buffer_ptr = png_ptr->current_buffer;
nuclear@1 659 }
nuclear@1 660
nuclear@1 661 void /* PRIVATE */
nuclear@1 662 png_push_read_IDAT(png_structp png_ptr)
nuclear@1 663 {
nuclear@1 664 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@1 665 PNG_CONST PNG_IDAT;
nuclear@1 666 #endif
nuclear@1 667 if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
nuclear@1 668 {
nuclear@1 669 png_byte chunk_length[4];
nuclear@1 670
nuclear@1 671 if (png_ptr->buffer_size < 8)
nuclear@1 672 {
nuclear@1 673 png_push_save_buffer(png_ptr);
nuclear@1 674 return;
nuclear@1 675 }
nuclear@1 676
nuclear@1 677 png_push_fill_buffer(png_ptr, chunk_length, 4);
nuclear@1 678 png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length);
nuclear@1 679 png_reset_crc(png_ptr);
nuclear@1 680 png_crc_read(png_ptr, png_ptr->chunk_name, 4);
nuclear@1 681 png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
nuclear@1 682
nuclear@1 683 if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@1 684 {
nuclear@1 685 png_ptr->process_mode = PNG_READ_CHUNK_MODE;
nuclear@1 686 if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
nuclear@1 687 png_error(png_ptr, "Not enough compressed data");
nuclear@1 688 return;
nuclear@1 689 }
nuclear@1 690
nuclear@1 691 png_ptr->idat_size = png_ptr->push_length;
nuclear@1 692 }
nuclear@1 693 if (png_ptr->idat_size && png_ptr->save_buffer_size)
nuclear@1 694 {
nuclear@1 695 png_size_t save_size;
nuclear@1 696
nuclear@1 697 if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
nuclear@1 698 {
nuclear@1 699 save_size = (png_size_t)png_ptr->idat_size;
nuclear@1 700 /* check for overflow */
nuclear@1 701 if ((png_uint_32)save_size != png_ptr->idat_size)
nuclear@1 702 png_error(png_ptr, "save_size overflowed in pngpread");
nuclear@1 703 }
nuclear@1 704 else
nuclear@1 705 save_size = png_ptr->save_buffer_size;
nuclear@1 706
nuclear@1 707 png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
nuclear@1 708 if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
nuclear@1 709 png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
nuclear@1 710 png_ptr->idat_size -= save_size;
nuclear@1 711 png_ptr->buffer_size -= save_size;
nuclear@1 712 png_ptr->save_buffer_size -= save_size;
nuclear@1 713 png_ptr->save_buffer_ptr += save_size;
nuclear@1 714 }
nuclear@1 715 if (png_ptr->idat_size && png_ptr->current_buffer_size)
nuclear@1 716 {
nuclear@1 717 png_size_t save_size;
nuclear@1 718
nuclear@1 719 if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
nuclear@1 720 {
nuclear@1 721 save_size = (png_size_t)png_ptr->idat_size;
nuclear@1 722 /* check for overflow */
nuclear@1 723 if ((png_uint_32)save_size != png_ptr->idat_size)
nuclear@1 724 png_error(png_ptr, "save_size overflowed in pngpread");
nuclear@1 725 }
nuclear@1 726 else
nuclear@1 727 save_size = png_ptr->current_buffer_size;
nuclear@1 728
nuclear@1 729 png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size);
nuclear@1 730 if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
nuclear@1 731 png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size);
nuclear@1 732
nuclear@1 733 png_ptr->idat_size -= save_size;
nuclear@1 734 png_ptr->buffer_size -= save_size;
nuclear@1 735 png_ptr->current_buffer_size -= save_size;
nuclear@1 736 png_ptr->current_buffer_ptr += save_size;
nuclear@1 737 }
nuclear@1 738 if (!png_ptr->idat_size)
nuclear@1 739 {
nuclear@1 740 if (png_ptr->buffer_size < 4)
nuclear@1 741 {
nuclear@1 742 png_push_save_buffer(png_ptr);
nuclear@1 743 return;
nuclear@1 744 }
nuclear@1 745
nuclear@1 746 png_crc_finish(png_ptr, 0);
nuclear@1 747 png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
nuclear@1 748 png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@1 749 }
nuclear@1 750 }
nuclear@1 751
nuclear@1 752 void /* PRIVATE */
nuclear@1 753 png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
nuclear@1 754 png_size_t buffer_length)
nuclear@1 755 {
nuclear@1 756 int ret;
nuclear@1 757
nuclear@1 758 if ((png_ptr->flags & PNG_FLAG_ZLIB_FINISHED) && buffer_length)
nuclear@1 759 png_error(png_ptr, "Extra compression data");
nuclear@1 760
nuclear@1 761 png_ptr->zstream.next_in = buffer;
nuclear@1 762 png_ptr->zstream.avail_in = (uInt)buffer_length;
nuclear@1 763 for (;;)
nuclear@1 764 {
nuclear@1 765 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
nuclear@1 766 if (ret != Z_OK)
nuclear@1 767 {
nuclear@1 768 if (ret == Z_STREAM_END)
nuclear@1 769 {
nuclear@1 770 if (png_ptr->zstream.avail_in)
nuclear@1 771 png_error(png_ptr, "Extra compressed data");
nuclear@1 772 if (!(png_ptr->zstream.avail_out))
nuclear@1 773 {
nuclear@1 774 png_push_process_row(png_ptr);
nuclear@1 775 }
nuclear@1 776
nuclear@1 777 png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@1 778 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
nuclear@1 779 break;
nuclear@1 780 }
nuclear@1 781 else if (ret == Z_BUF_ERROR)
nuclear@1 782 break;
nuclear@1 783 else
nuclear@1 784 png_error(png_ptr, "Decompression Error");
nuclear@1 785 }
nuclear@1 786 if (!(png_ptr->zstream.avail_out))
nuclear@1 787 {
nuclear@1 788 if ((
nuclear@1 789 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@1 790 png_ptr->interlaced && png_ptr->pass > 6) ||
nuclear@1 791 (!png_ptr->interlaced &&
nuclear@1 792 #endif
nuclear@1 793 png_ptr->row_number == png_ptr->num_rows))
nuclear@1 794 {
nuclear@1 795 if (png_ptr->zstream.avail_in)
nuclear@1 796 png_warning(png_ptr, "Too much data in IDAT chunks");
nuclear@1 797 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
nuclear@1 798 break;
nuclear@1 799 }
nuclear@1 800 png_push_process_row(png_ptr);
nuclear@1 801 png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
nuclear@1 802 png_ptr->zstream.next_out = png_ptr->row_buf;
nuclear@1 803 }
nuclear@1 804 else
nuclear@1 805 break;
nuclear@1 806 }
nuclear@1 807 }
nuclear@1 808
nuclear@1 809 void /* PRIVATE */
nuclear@1 810 png_push_process_row(png_structp png_ptr)
nuclear@1 811 {
nuclear@1 812 png_ptr->row_info.color_type = png_ptr->color_type;
nuclear@1 813 png_ptr->row_info.width = png_ptr->iwidth;
nuclear@1 814 png_ptr->row_info.channels = png_ptr->channels;
nuclear@1 815 png_ptr->row_info.bit_depth = png_ptr->bit_depth;
nuclear@1 816 png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
nuclear@1 817
nuclear@1 818 png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
nuclear@1 819 png_ptr->row_info.width);
nuclear@1 820
nuclear@1 821 png_read_filter_row(png_ptr, &(png_ptr->row_info),
nuclear@1 822 png_ptr->row_buf + 1, png_ptr->prev_row + 1,
nuclear@1 823 (int)(png_ptr->row_buf[0]));
nuclear@1 824
nuclear@1 825 png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
nuclear@1 826 png_ptr->rowbytes + 1);
nuclear@1 827
nuclear@1 828 if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
nuclear@1 829 png_do_read_transformations(png_ptr);
nuclear@1 830
nuclear@1 831 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@1 832 /* blow up interlaced rows to full size */
nuclear@1 833 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
nuclear@1 834 {
nuclear@1 835 if (png_ptr->pass < 6)
nuclear@1 836 /* old interface (pre-1.0.9):
nuclear@1 837 png_do_read_interlace(&(png_ptr->row_info),
nuclear@1 838 png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
nuclear@1 839 */
nuclear@1 840 png_do_read_interlace(png_ptr);
nuclear@1 841
nuclear@1 842 switch (png_ptr->pass)
nuclear@1 843 {
nuclear@1 844 case 0:
nuclear@1 845 {
nuclear@1 846 int i;
nuclear@1 847 for (i = 0; i < 8 && png_ptr->pass == 0; i++)
nuclear@1 848 {
nuclear@1 849 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@1 850 png_read_push_finish_row(png_ptr); /* updates png_ptr->pass */
nuclear@1 851 }
nuclear@1 852 if (png_ptr->pass == 2) /* pass 1 might be empty */
nuclear@1 853 {
nuclear@1 854 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
nuclear@1 855 {
nuclear@1 856 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@1 857 png_read_push_finish_row(png_ptr);
nuclear@1 858 }
nuclear@1 859 }
nuclear@1 860 if (png_ptr->pass == 4 && png_ptr->height <= 4)
nuclear@1 861 {
nuclear@1 862 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@1 863 {
nuclear@1 864 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@1 865 png_read_push_finish_row(png_ptr);
nuclear@1 866 }
nuclear@1 867 }
nuclear@1 868 if (png_ptr->pass == 6 && png_ptr->height <= 4)
nuclear@1 869 {
nuclear@1 870 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@1 871 png_read_push_finish_row(png_ptr);
nuclear@1 872 }
nuclear@1 873 break;
nuclear@1 874 }
nuclear@1 875 case 1:
nuclear@1 876 {
nuclear@1 877 int i;
nuclear@1 878 for (i = 0; i < 8 && png_ptr->pass == 1; i++)
nuclear@1 879 {
nuclear@1 880 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@1 881 png_read_push_finish_row(png_ptr);
nuclear@1 882 }
nuclear@1 883 if (png_ptr->pass == 2) /* skip top 4 generated rows */
nuclear@1 884 {
nuclear@1 885 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
nuclear@1 886 {
nuclear@1 887 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@1 888 png_read_push_finish_row(png_ptr);
nuclear@1 889 }
nuclear@1 890 }
nuclear@1 891 break;
nuclear@1 892 }
nuclear@1 893 case 2:
nuclear@1 894 {
nuclear@1 895 int i;
nuclear@1 896 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
nuclear@1 897 {
nuclear@1 898 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@1 899 png_read_push_finish_row(png_ptr);
nuclear@1 900 }
nuclear@1 901 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
nuclear@1 902 {
nuclear@1 903 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@1 904 png_read_push_finish_row(png_ptr);
nuclear@1 905 }
nuclear@1 906 if (png_ptr->pass == 4) /* pass 3 might be empty */
nuclear@1 907 {
nuclear@1 908 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@1 909 {
nuclear@1 910 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@1 911 png_read_push_finish_row(png_ptr);
nuclear@1 912 }
nuclear@1 913 }
nuclear@1 914 break;
nuclear@1 915 }
nuclear@1 916 case 3:
nuclear@1 917 {
nuclear@1 918 int i;
nuclear@1 919 for (i = 0; i < 4 && png_ptr->pass == 3; i++)
nuclear@1 920 {
nuclear@1 921 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@1 922 png_read_push_finish_row(png_ptr);
nuclear@1 923 }
nuclear@1 924 if (png_ptr->pass == 4) /* skip top two generated rows */
nuclear@1 925 {
nuclear@1 926 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@1 927 {
nuclear@1 928 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@1 929 png_read_push_finish_row(png_ptr);
nuclear@1 930 }
nuclear@1 931 }
nuclear@1 932 break;
nuclear@1 933 }
nuclear@1 934 case 4:
nuclear@1 935 {
nuclear@1 936 int i;
nuclear@1 937 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@1 938 {
nuclear@1 939 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@1 940 png_read_push_finish_row(png_ptr);
nuclear@1 941 }
nuclear@1 942 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
nuclear@1 943 {
nuclear@1 944 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@1 945 png_read_push_finish_row(png_ptr);
nuclear@1 946 }
nuclear@1 947 if (png_ptr->pass == 6) /* pass 5 might be empty */
nuclear@1 948 {
nuclear@1 949 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@1 950 png_read_push_finish_row(png_ptr);
nuclear@1 951 }
nuclear@1 952 break;
nuclear@1 953 }
nuclear@1 954 case 5:
nuclear@1 955 {
nuclear@1 956 int i;
nuclear@1 957 for (i = 0; i < 2 && png_ptr->pass == 5; i++)
nuclear@1 958 {
nuclear@1 959 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@1 960 png_read_push_finish_row(png_ptr);
nuclear@1 961 }
nuclear@1 962 if (png_ptr->pass == 6) /* skip top generated row */
nuclear@1 963 {
nuclear@1 964 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@1 965 png_read_push_finish_row(png_ptr);
nuclear@1 966 }
nuclear@1 967 break;
nuclear@1 968 }
nuclear@1 969 case 6:
nuclear@1 970 {
nuclear@1 971 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@1 972 png_read_push_finish_row(png_ptr);
nuclear@1 973 if (png_ptr->pass != 6)
nuclear@1 974 break;
nuclear@1 975 png_push_have_row(png_ptr, png_bytep_NULL);
nuclear@1 976 png_read_push_finish_row(png_ptr);
nuclear@1 977 }
nuclear@1 978 }
nuclear@1 979 }
nuclear@1 980 else
nuclear@1 981 #endif
nuclear@1 982 {
nuclear@1 983 png_push_have_row(png_ptr, png_ptr->row_buf + 1);
nuclear@1 984 png_read_push_finish_row(png_ptr);
nuclear@1 985 }
nuclear@1 986 }
nuclear@1 987
nuclear@1 988 void /* PRIVATE */
nuclear@1 989 png_read_push_finish_row(png_structp png_ptr)
nuclear@1 990 {
nuclear@1 991 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@1 992 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
nuclear@1 993
nuclear@1 994 /* start of interlace block */
nuclear@1 995 PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
nuclear@1 996
nuclear@1 997 /* offset to next interlace block */
nuclear@1 998 PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
nuclear@1 999
nuclear@1 1000 /* start of interlace block in the y direction */
nuclear@1 1001 PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
nuclear@1 1002
nuclear@1 1003 /* offset to next interlace block in the y direction */
nuclear@1 1004 PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
nuclear@1 1005
nuclear@1 1006 /* Height of interlace block. This is not currently used - if you need
nuclear@1 1007 * it, uncomment it here and in png.h
nuclear@1 1008 PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
nuclear@1 1009 */
nuclear@1 1010 #endif
nuclear@1 1011
nuclear@1 1012 png_ptr->row_number++;
nuclear@1 1013 if (png_ptr->row_number < png_ptr->num_rows)
nuclear@1 1014 return;
nuclear@1 1015
nuclear@1 1016 if (png_ptr->interlaced)
nuclear@1 1017 {
nuclear@1 1018 png_ptr->row_number = 0;
nuclear@1 1019 png_memset_check(png_ptr, png_ptr->prev_row, 0,
nuclear@1 1020 png_ptr->rowbytes + 1);
nuclear@1 1021 do
nuclear@1 1022 {
nuclear@1 1023 png_ptr->pass++;
nuclear@1 1024 if ((png_ptr->pass == 1 && png_ptr->width < 5) ||
nuclear@1 1025 (png_ptr->pass == 3 && png_ptr->width < 3) ||
nuclear@1 1026 (png_ptr->pass == 5 && png_ptr->width < 2))
nuclear@1 1027 png_ptr->pass++;
nuclear@1 1028
nuclear@1 1029 if (png_ptr->pass > 7)
nuclear@1 1030 png_ptr->pass--;
nuclear@1 1031 if (png_ptr->pass >= 7)
nuclear@1 1032 break;
nuclear@1 1033
nuclear@1 1034 png_ptr->iwidth = (png_ptr->width +
nuclear@1 1035 png_pass_inc[png_ptr->pass] - 1 -
nuclear@1 1036 png_pass_start[png_ptr->pass]) /
nuclear@1 1037 png_pass_inc[png_ptr->pass];
nuclear@1 1038
nuclear@1 1039 png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth,
nuclear@1 1040 png_ptr->iwidth) + 1;
nuclear@1 1041
nuclear@1 1042 if (png_ptr->transformations & PNG_INTERLACE)
nuclear@1 1043 break;
nuclear@1 1044
nuclear@1 1045 png_ptr->num_rows = (png_ptr->height +
nuclear@1 1046 png_pass_yinc[png_ptr->pass] - 1 -
nuclear@1 1047 png_pass_ystart[png_ptr->pass]) /
nuclear@1 1048 png_pass_yinc[png_ptr->pass];
nuclear@1 1049
nuclear@1 1050 } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
nuclear@1 1051 }
nuclear@1 1052 }
nuclear@1 1053
nuclear@1 1054 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@1 1055 void /* PRIVATE */
nuclear@1 1056 png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
nuclear@1 1057 length)
nuclear@1 1058 {
nuclear@1 1059 if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
nuclear@1 1060 {
nuclear@1 1061 png_error(png_ptr, "Out of place tEXt");
nuclear@1 1062 info_ptr = info_ptr; /* to quiet some compiler warnings */
nuclear@1 1063 }
nuclear@1 1064
nuclear@1 1065 #ifdef PNG_MAX_MALLOC_64K
nuclear@1 1066 png_ptr->skip_length = 0; /* This may not be necessary */
nuclear@1 1067
nuclear@1 1068 if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
nuclear@1 1069 {
nuclear@1 1070 png_warning(png_ptr, "tEXt chunk too large to fit in memory");
nuclear@1 1071 png_ptr->skip_length = length - (png_uint_32)65535L;
nuclear@1 1072 length = (png_uint_32)65535L;
nuclear@1 1073 }
nuclear@1 1074 #endif
nuclear@1 1075
nuclear@1 1076 png_ptr->current_text = (png_charp)png_malloc(png_ptr,
nuclear@1 1077 (png_uint_32)(length + 1));
nuclear@1 1078 png_ptr->current_text[length] = '\0';
nuclear@1 1079 png_ptr->current_text_ptr = png_ptr->current_text;
nuclear@1 1080 png_ptr->current_text_size = (png_size_t)length;
nuclear@1 1081 png_ptr->current_text_left = (png_size_t)length;
nuclear@1 1082 png_ptr->process_mode = PNG_READ_tEXt_MODE;
nuclear@1 1083 }
nuclear@1 1084
nuclear@1 1085 void /* PRIVATE */
nuclear@1 1086 png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
nuclear@1 1087 {
nuclear@1 1088 if (png_ptr->buffer_size && png_ptr->current_text_left)
nuclear@1 1089 {
nuclear@1 1090 png_size_t text_size;
nuclear@1 1091
nuclear@1 1092 if (png_ptr->buffer_size < png_ptr->current_text_left)
nuclear@1 1093 text_size = png_ptr->buffer_size;
nuclear@1 1094 else
nuclear@1 1095 text_size = png_ptr->current_text_left;
nuclear@1 1096 png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
nuclear@1 1097 png_ptr->current_text_left -= text_size;
nuclear@1 1098 png_ptr->current_text_ptr += text_size;
nuclear@1 1099 }
nuclear@1 1100 if (!(png_ptr->current_text_left))
nuclear@1 1101 {
nuclear@1 1102 png_textp text_ptr;
nuclear@1 1103 png_charp text;
nuclear@1 1104 png_charp key;
nuclear@1 1105 int ret;
nuclear@1 1106
nuclear@1 1107 if (png_ptr->buffer_size < 4)
nuclear@1 1108 {
nuclear@1 1109 png_push_save_buffer(png_ptr);
nuclear@1 1110 return;
nuclear@1 1111 }
nuclear@1 1112
nuclear@1 1113 png_push_crc_finish(png_ptr);
nuclear@1 1114
nuclear@1 1115 #if defined(PNG_MAX_MALLOC_64K)
nuclear@1 1116 if (png_ptr->skip_length)
nuclear@1 1117 return;
nuclear@1 1118 #endif
nuclear@1 1119
nuclear@1 1120 key = png_ptr->current_text;
nuclear@1 1121
nuclear@1 1122 for (text = key; *text; text++)
nuclear@1 1123 /* empty loop */ ;
nuclear@1 1124
nuclear@1 1125 if (text < key + png_ptr->current_text_size)
nuclear@1 1126 text++;
nuclear@1 1127
nuclear@1 1128 text_ptr = (png_textp)png_malloc(png_ptr,
nuclear@1 1129 (png_uint_32)png_sizeof(png_text));
nuclear@1 1130 text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
nuclear@1 1131 text_ptr->key = key;
nuclear@1 1132 #ifdef PNG_iTXt_SUPPORTED
nuclear@1 1133 text_ptr->lang = NULL;
nuclear@1 1134 text_ptr->lang_key = NULL;
nuclear@1 1135 #endif
nuclear@1 1136 text_ptr->text = text;
nuclear@1 1137
nuclear@1 1138 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
nuclear@1 1139
nuclear@1 1140 png_free(png_ptr, key);
nuclear@1 1141 png_free(png_ptr, text_ptr);
nuclear@1 1142 png_ptr->current_text = NULL;
nuclear@1 1143
nuclear@1 1144 if (ret)
nuclear@1 1145 png_warning(png_ptr, "Insufficient memory to store text chunk.");
nuclear@1 1146 }
nuclear@1 1147 }
nuclear@1 1148 #endif
nuclear@1 1149
nuclear@1 1150 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@1 1151 void /* PRIVATE */
nuclear@1 1152 png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
nuclear@1 1153 length)
nuclear@1 1154 {
nuclear@1 1155 if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
nuclear@1 1156 {
nuclear@1 1157 png_error(png_ptr, "Out of place zTXt");
nuclear@1 1158 info_ptr = info_ptr; /* to quiet some compiler warnings */
nuclear@1 1159 }
nuclear@1 1160
nuclear@1 1161 #ifdef PNG_MAX_MALLOC_64K
nuclear@1 1162 /* We can't handle zTXt chunks > 64K, since we don't have enough space
nuclear@1 1163 * to be able to store the uncompressed data. Actually, the threshold
nuclear@1 1164 * is probably around 32K, but it isn't as definite as 64K is.
nuclear@1 1165 */
nuclear@1 1166 if (length > (png_uint_32)65535L)
nuclear@1 1167 {
nuclear@1 1168 png_warning(png_ptr, "zTXt chunk too large to fit in memory");
nuclear@1 1169 png_push_crc_skip(png_ptr, length);
nuclear@1 1170 return;
nuclear@1 1171 }
nuclear@1 1172 #endif
nuclear@1 1173
nuclear@1 1174 png_ptr->current_text = (png_charp)png_malloc(png_ptr,
nuclear@1 1175 (png_uint_32)(length + 1));
nuclear@1 1176 png_ptr->current_text[length] = '\0';
nuclear@1 1177 png_ptr->current_text_ptr = png_ptr->current_text;
nuclear@1 1178 png_ptr->current_text_size = (png_size_t)length;
nuclear@1 1179 png_ptr->current_text_left = (png_size_t)length;
nuclear@1 1180 png_ptr->process_mode = PNG_READ_zTXt_MODE;
nuclear@1 1181 }
nuclear@1 1182
nuclear@1 1183 void /* PRIVATE */
nuclear@1 1184 png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
nuclear@1 1185 {
nuclear@1 1186 if (png_ptr->buffer_size && png_ptr->current_text_left)
nuclear@1 1187 {
nuclear@1 1188 png_size_t text_size;
nuclear@1 1189
nuclear@1 1190 if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left)
nuclear@1 1191 text_size = png_ptr->buffer_size;
nuclear@1 1192 else
nuclear@1 1193 text_size = png_ptr->current_text_left;
nuclear@1 1194 png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
nuclear@1 1195 png_ptr->current_text_left -= text_size;
nuclear@1 1196 png_ptr->current_text_ptr += text_size;
nuclear@1 1197 }
nuclear@1 1198 if (!(png_ptr->current_text_left))
nuclear@1 1199 {
nuclear@1 1200 png_textp text_ptr;
nuclear@1 1201 png_charp text;
nuclear@1 1202 png_charp key;
nuclear@1 1203 int ret;
nuclear@1 1204 png_size_t text_size, key_size;
nuclear@1 1205
nuclear@1 1206 if (png_ptr->buffer_size < 4)
nuclear@1 1207 {
nuclear@1 1208 png_push_save_buffer(png_ptr);
nuclear@1 1209 return;
nuclear@1 1210 }
nuclear@1 1211
nuclear@1 1212 png_push_crc_finish(png_ptr);
nuclear@1 1213
nuclear@1 1214 key = png_ptr->current_text;
nuclear@1 1215
nuclear@1 1216 for (text = key; *text; text++)
nuclear@1 1217 /* empty loop */ ;
nuclear@1 1218
nuclear@1 1219 /* zTXt can't have zero text */
nuclear@1 1220 if (text >= key + png_ptr->current_text_size)
nuclear@1 1221 {
nuclear@1 1222 png_ptr->current_text = NULL;
nuclear@1 1223 png_free(png_ptr, key);
nuclear@1 1224 return;
nuclear@1 1225 }
nuclear@1 1226
nuclear@1 1227 text++;
nuclear@1 1228
nuclear@1 1229 if (*text != PNG_TEXT_COMPRESSION_zTXt) /* check compression byte */
nuclear@1 1230 {
nuclear@1 1231 png_ptr->current_text = NULL;
nuclear@1 1232 png_free(png_ptr, key);
nuclear@1 1233 return;
nuclear@1 1234 }
nuclear@1 1235
nuclear@1 1236 text++;
nuclear@1 1237
nuclear@1 1238 png_ptr->zstream.next_in = (png_bytep )text;
nuclear@1 1239 png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size -
nuclear@1 1240 (text - key));
nuclear@1 1241 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@1 1242 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@1 1243
nuclear@1 1244 key_size = text - key;
nuclear@1 1245 text_size = 0;
nuclear@1 1246 text = NULL;
nuclear@1 1247 ret = Z_STREAM_END;
nuclear@1 1248
nuclear@1 1249 while (png_ptr->zstream.avail_in)
nuclear@1 1250 {
nuclear@1 1251 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
nuclear@1 1252 if (ret != Z_OK && ret != Z_STREAM_END)
nuclear@1 1253 {
nuclear@1 1254 inflateReset(&png_ptr->zstream);
nuclear@1 1255 png_ptr->zstream.avail_in = 0;
nuclear@1 1256 png_ptr->current_text = NULL;
nuclear@1 1257 png_free(png_ptr, key);
nuclear@1 1258 png_free(png_ptr, text);
nuclear@1 1259 return;
nuclear@1 1260 }
nuclear@1 1261 if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END)
nuclear@1 1262 {
nuclear@1 1263 if (text == NULL)
nuclear@1 1264 {
nuclear@1 1265 text = (png_charp)png_malloc(png_ptr,
nuclear@1 1266 (png_uint_32)(png_ptr->zbuf_size
nuclear@1 1267 - png_ptr->zstream.avail_out + key_size + 1));
nuclear@1 1268 png_memcpy(text + key_size, png_ptr->zbuf,
nuclear@1 1269 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
nuclear@1 1270 png_memcpy(text, key, key_size);
nuclear@1 1271 text_size = key_size + png_ptr->zbuf_size -
nuclear@1 1272 png_ptr->zstream.avail_out;
nuclear@1 1273 *(text + text_size) = '\0';
nuclear@1 1274 }
nuclear@1 1275 else
nuclear@1 1276 {
nuclear@1 1277 png_charp tmp;
nuclear@1 1278
nuclear@1 1279 tmp = text;
nuclear@1 1280 text = (png_charp)png_malloc(png_ptr, text_size +
nuclear@1 1281 (png_uint_32)(png_ptr->zbuf_size
nuclear@1 1282 - png_ptr->zstream.avail_out + 1));
nuclear@1 1283 png_memcpy(text, tmp, text_size);
nuclear@1 1284 png_free(png_ptr, tmp);
nuclear@1 1285 png_memcpy(text + text_size, png_ptr->zbuf,
nuclear@1 1286 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
nuclear@1 1287 text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
nuclear@1 1288 *(text + text_size) = '\0';
nuclear@1 1289 }
nuclear@1 1290 if (ret != Z_STREAM_END)
nuclear@1 1291 {
nuclear@1 1292 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@1 1293 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@1 1294 }
nuclear@1 1295 }
nuclear@1 1296 else
nuclear@1 1297 {
nuclear@1 1298 break;
nuclear@1 1299 }
nuclear@1 1300
nuclear@1 1301 if (ret == Z_STREAM_END)
nuclear@1 1302 break;
nuclear@1 1303 }
nuclear@1 1304
nuclear@1 1305 inflateReset(&png_ptr->zstream);
nuclear@1 1306 png_ptr->zstream.avail_in = 0;
nuclear@1 1307
nuclear@1 1308 if (ret != Z_STREAM_END)
nuclear@1 1309 {
nuclear@1 1310 png_ptr->current_text = NULL;
nuclear@1 1311 png_free(png_ptr, key);
nuclear@1 1312 png_free(png_ptr, text);
nuclear@1 1313 return;
nuclear@1 1314 }
nuclear@1 1315
nuclear@1 1316 png_ptr->current_text = NULL;
nuclear@1 1317 png_free(png_ptr, key);
nuclear@1 1318 key = text;
nuclear@1 1319 text += key_size;
nuclear@1 1320
nuclear@1 1321 text_ptr = (png_textp)png_malloc(png_ptr,
nuclear@1 1322 (png_uint_32)png_sizeof(png_text));
nuclear@1 1323 text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
nuclear@1 1324 text_ptr->key = key;
nuclear@1 1325 #ifdef PNG_iTXt_SUPPORTED
nuclear@1 1326 text_ptr->lang = NULL;
nuclear@1 1327 text_ptr->lang_key = NULL;
nuclear@1 1328 #endif
nuclear@1 1329 text_ptr->text = text;
nuclear@1 1330
nuclear@1 1331 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
nuclear@1 1332
nuclear@1 1333 png_free(png_ptr, key);
nuclear@1 1334 png_free(png_ptr, text_ptr);
nuclear@1 1335
nuclear@1 1336 if (ret)
nuclear@1 1337 png_warning(png_ptr, "Insufficient memory to store text chunk.");
nuclear@1 1338 }
nuclear@1 1339 }
nuclear@1 1340 #endif
nuclear@1 1341
nuclear@1 1342 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@1 1343 void /* PRIVATE */
nuclear@1 1344 png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
nuclear@1 1345 length)
nuclear@1 1346 {
nuclear@1 1347 if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
nuclear@1 1348 {
nuclear@1 1349 png_error(png_ptr, "Out of place iTXt");
nuclear@1 1350 info_ptr = info_ptr; /* to quiet some compiler warnings */
nuclear@1 1351 }
nuclear@1 1352
nuclear@1 1353 #ifdef PNG_MAX_MALLOC_64K
nuclear@1 1354 png_ptr->skip_length = 0; /* This may not be necessary */
nuclear@1 1355
nuclear@1 1356 if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
nuclear@1 1357 {
nuclear@1 1358 png_warning(png_ptr, "iTXt chunk too large to fit in memory");
nuclear@1 1359 png_ptr->skip_length = length - (png_uint_32)65535L;
nuclear@1 1360 length = (png_uint_32)65535L;
nuclear@1 1361 }
nuclear@1 1362 #endif
nuclear@1 1363
nuclear@1 1364 png_ptr->current_text = (png_charp)png_malloc(png_ptr,
nuclear@1 1365 (png_uint_32)(length + 1));
nuclear@1 1366 png_ptr->current_text[length] = '\0';
nuclear@1 1367 png_ptr->current_text_ptr = png_ptr->current_text;
nuclear@1 1368 png_ptr->current_text_size = (png_size_t)length;
nuclear@1 1369 png_ptr->current_text_left = (png_size_t)length;
nuclear@1 1370 png_ptr->process_mode = PNG_READ_iTXt_MODE;
nuclear@1 1371 }
nuclear@1 1372
nuclear@1 1373 void /* PRIVATE */
nuclear@1 1374 png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
nuclear@1 1375 {
nuclear@1 1376
nuclear@1 1377 if (png_ptr->buffer_size && png_ptr->current_text_left)
nuclear@1 1378 {
nuclear@1 1379 png_size_t text_size;
nuclear@1 1380
nuclear@1 1381 if (png_ptr->buffer_size < png_ptr->current_text_left)
nuclear@1 1382 text_size = png_ptr->buffer_size;
nuclear@1 1383 else
nuclear@1 1384 text_size = png_ptr->current_text_left;
nuclear@1 1385 png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
nuclear@1 1386 png_ptr->current_text_left -= text_size;
nuclear@1 1387 png_ptr->current_text_ptr += text_size;
nuclear@1 1388 }
nuclear@1 1389 if (!(png_ptr->current_text_left))
nuclear@1 1390 {
nuclear@1 1391 png_textp text_ptr;
nuclear@1 1392 png_charp key;
nuclear@1 1393 int comp_flag;
nuclear@1 1394 png_charp lang;
nuclear@1 1395 png_charp lang_key;
nuclear@1 1396 png_charp text;
nuclear@1 1397 int ret;
nuclear@1 1398
nuclear@1 1399 if (png_ptr->buffer_size < 4)
nuclear@1 1400 {
nuclear@1 1401 png_push_save_buffer(png_ptr);
nuclear@1 1402 return;
nuclear@1 1403 }
nuclear@1 1404
nuclear@1 1405 png_push_crc_finish(png_ptr);
nuclear@1 1406
nuclear@1 1407 #if defined(PNG_MAX_MALLOC_64K)
nuclear@1 1408 if (png_ptr->skip_length)
nuclear@1 1409 return;
nuclear@1 1410 #endif
nuclear@1 1411
nuclear@1 1412 key = png_ptr->current_text;
nuclear@1 1413
nuclear@1 1414 for (lang = key; *lang; lang++)
nuclear@1 1415 /* empty loop */ ;
nuclear@1 1416
nuclear@1 1417 if (lang < key + png_ptr->current_text_size - 3)
nuclear@1 1418 lang++;
nuclear@1 1419
nuclear@1 1420 comp_flag = *lang++;
nuclear@1 1421 lang++; /* skip comp_type, always zero */
nuclear@1 1422
nuclear@1 1423 for (lang_key = lang; *lang_key; lang_key++)
nuclear@1 1424 /* empty loop */ ;
nuclear@1 1425 lang_key++; /* skip NUL separator */
nuclear@1 1426
nuclear@1 1427 text=lang_key;
nuclear@1 1428 if (lang_key < key + png_ptr->current_text_size - 1)
nuclear@1 1429 {
nuclear@1 1430 for (; *text; text++)
nuclear@1 1431 /* empty loop */ ;
nuclear@1 1432 }
nuclear@1 1433
nuclear@1 1434 if (text < key + png_ptr->current_text_size)
nuclear@1 1435 text++;
nuclear@1 1436
nuclear@1 1437 text_ptr = (png_textp)png_malloc(png_ptr,
nuclear@1 1438 (png_uint_32)png_sizeof(png_text));
nuclear@1 1439 text_ptr->compression = comp_flag + 2;
nuclear@1 1440 text_ptr->key = key;
nuclear@1 1441 text_ptr->lang = lang;
nuclear@1 1442 text_ptr->lang_key = lang_key;
nuclear@1 1443 text_ptr->text = text;
nuclear@1 1444 text_ptr->text_length = 0;
nuclear@1 1445 text_ptr->itxt_length = png_strlen(text);
nuclear@1 1446
nuclear@1 1447 ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
nuclear@1 1448
nuclear@1 1449 png_ptr->current_text = NULL;
nuclear@1 1450
nuclear@1 1451 png_free(png_ptr, text_ptr);
nuclear@1 1452 if (ret)
nuclear@1 1453 png_warning(png_ptr, "Insufficient memory to store iTXt chunk.");
nuclear@1 1454 }
nuclear@1 1455 }
nuclear@1 1456 #endif
nuclear@1 1457
nuclear@1 1458 /* This function is called when we haven't found a handler for this
nuclear@1 1459 * chunk. If there isn't a problem with the chunk itself (ie a bad chunk
nuclear@1 1460 * name or a critical chunk), the chunk is (currently) silently ignored.
nuclear@1 1461 */
nuclear@1 1462 void /* PRIVATE */
nuclear@1 1463 png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
nuclear@1 1464 length)
nuclear@1 1465 {
nuclear@1 1466 png_uint_32 skip = 0;
nuclear@1 1467
nuclear@1 1468 if (!(png_ptr->chunk_name[0] & 0x20))
nuclear@1 1469 {
nuclear@1 1470 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@1 1471 if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
nuclear@1 1472 PNG_HANDLE_CHUNK_ALWAYS
nuclear@1 1473 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
nuclear@1 1474 && png_ptr->read_user_chunk_fn == NULL
nuclear@1 1475 #endif
nuclear@1 1476 )
nuclear@1 1477 #endif
nuclear@1 1478 png_chunk_error(png_ptr, "unknown critical chunk");
nuclear@1 1479
nuclear@1 1480 info_ptr = info_ptr; /* to quiet some compiler warnings */
nuclear@1 1481 }
nuclear@1 1482
nuclear@1 1483 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@1 1484 if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
nuclear@1 1485 {
nuclear@1 1486 #ifdef PNG_MAX_MALLOC_64K
nuclear@1 1487 if (length > (png_uint_32)65535L)
nuclear@1 1488 {
nuclear@1 1489 png_warning(png_ptr, "unknown chunk too large to fit in memory");
nuclear@1 1490 skip = length - (png_uint_32)65535L;
nuclear@1 1491 length = (png_uint_32)65535L;
nuclear@1 1492 }
nuclear@1 1493 #endif
nuclear@1 1494 png_memcpy((png_charp)png_ptr->unknown_chunk.name,
nuclear@1 1495 (png_charp)png_ptr->chunk_name,
nuclear@1 1496 png_sizeof(png_ptr->unknown_chunk.name));
nuclear@1 1497 png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name) - 1]
nuclear@1 1498 = '\0';
nuclear@1 1499
nuclear@1 1500 png_ptr->unknown_chunk.size = (png_size_t)length;
nuclear@1 1501 if (length == 0)
nuclear@1 1502 png_ptr->unknown_chunk.data = NULL;
nuclear@1 1503 else
nuclear@1 1504 {
nuclear@1 1505 png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr,
nuclear@1 1506 (png_uint_32)length);
nuclear@1 1507 png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
nuclear@1 1508 }
nuclear@1 1509 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
nuclear@1 1510 if (png_ptr->read_user_chunk_fn != NULL)
nuclear@1 1511 {
nuclear@1 1512 /* callback to user unknown chunk handler */
nuclear@1 1513 int ret;
nuclear@1 1514 ret = (*(png_ptr->read_user_chunk_fn))
nuclear@1 1515 (png_ptr, &png_ptr->unknown_chunk);
nuclear@1 1516 if (ret < 0)
nuclear@1 1517 png_chunk_error(png_ptr, "error in user chunk");
nuclear@1 1518 if (ret == 0)
nuclear@1 1519 {
nuclear@1 1520 if (!(png_ptr->chunk_name[0] & 0x20))
nuclear@1 1521 if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
nuclear@1 1522 PNG_HANDLE_CHUNK_ALWAYS)
nuclear@1 1523 png_chunk_error(png_ptr, "unknown critical chunk");
nuclear@1 1524 png_set_unknown_chunks(png_ptr, info_ptr,
nuclear@1 1525 &png_ptr->unknown_chunk, 1);
nuclear@1 1526 }
nuclear@1 1527 }
nuclear@1 1528 else
nuclear@1 1529 #endif
nuclear@1 1530 png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
nuclear@1 1531 png_free(png_ptr, png_ptr->unknown_chunk.data);
nuclear@1 1532 png_ptr->unknown_chunk.data = NULL;
nuclear@1 1533 }
nuclear@1 1534 else
nuclear@1 1535 #endif
nuclear@1 1536 skip=length;
nuclear@1 1537 png_push_crc_skip(png_ptr, skip);
nuclear@1 1538 }
nuclear@1 1539
nuclear@1 1540 void /* PRIVATE */
nuclear@1 1541 png_push_have_info(png_structp png_ptr, png_infop info_ptr)
nuclear@1 1542 {
nuclear@1 1543 if (png_ptr->info_fn != NULL)
nuclear@1 1544 (*(png_ptr->info_fn))(png_ptr, info_ptr);
nuclear@1 1545 }
nuclear@1 1546
nuclear@1 1547 void /* PRIVATE */
nuclear@1 1548 png_push_have_end(png_structp png_ptr, png_infop info_ptr)
nuclear@1 1549 {
nuclear@1 1550 if (png_ptr->end_fn != NULL)
nuclear@1 1551 (*(png_ptr->end_fn))(png_ptr, info_ptr);
nuclear@1 1552 }
nuclear@1 1553
nuclear@1 1554 void /* PRIVATE */
nuclear@1 1555 png_push_have_row(png_structp png_ptr, png_bytep row)
nuclear@1 1556 {
nuclear@1 1557 if (png_ptr->row_fn != NULL)
nuclear@1 1558 (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number,
nuclear@1 1559 (int)png_ptr->pass);
nuclear@1 1560 }
nuclear@1 1561
nuclear@1 1562 void PNGAPI
nuclear@1 1563 png_progressive_combine_row (png_structp png_ptr,
nuclear@1 1564 png_bytep old_row, png_bytep new_row)
nuclear@1 1565 {
nuclear@1 1566 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@1 1567 PNG_CONST int FARDATA png_pass_dsp_mask[7] =
nuclear@1 1568 {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
nuclear@1 1569 #endif
nuclear@1 1570 if (png_ptr == NULL) return;
nuclear@1 1571 if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */
nuclear@1 1572 png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
nuclear@1 1573 }
nuclear@1 1574
nuclear@1 1575 void PNGAPI
nuclear@1 1576 png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
nuclear@1 1577 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
nuclear@1 1578 png_progressive_end_ptr end_fn)
nuclear@1 1579 {
nuclear@1 1580 if (png_ptr == NULL) return;
nuclear@1 1581 png_ptr->info_fn = info_fn;
nuclear@1 1582 png_ptr->row_fn = row_fn;
nuclear@1 1583 png_ptr->end_fn = end_fn;
nuclear@1 1584
nuclear@1 1585 png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
nuclear@1 1586 }
nuclear@1 1587
nuclear@1 1588 png_voidp PNGAPI
nuclear@1 1589 png_get_progressive_ptr(png_structp png_ptr)
nuclear@1 1590 {
nuclear@1 1591 if (png_ptr == NULL) return (NULL);
nuclear@1 1592 return png_ptr->io_ptr;
nuclear@1 1593 }
nuclear@1 1594 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */