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annotate libs/libpng/pngread.c @ 0:b2f14e535253

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initial commit
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 01 Feb 2014 19:58:19 +0200
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rev   line source
nuclear@0 1
nuclear@0 2 /* pngread.c - read a PNG file
nuclear@0 3 *
nuclear@0 4 * Last changed in libpng 1.2.30 [August 15, 2008]
nuclear@0 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@0 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@0 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@0 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@0 9 *
nuclear@0 10 * This file contains routines that an application calls directly to
nuclear@0 11 * read a PNG file or stream.
nuclear@0 12 */
nuclear@0 13
nuclear@0 14 #define PNG_INTERNAL
nuclear@0 15 #include "png.h"
nuclear@0 16 #if defined(PNG_READ_SUPPORTED)
nuclear@0 17
nuclear@0 18 /* Create a PNG structure for reading, and allocate any memory needed. */
nuclear@0 19 png_structp PNGAPI
nuclear@0 20 png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@0 21 png_error_ptr error_fn, png_error_ptr warn_fn)
nuclear@0 22 {
nuclear@0 23
nuclear@0 24 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 25 return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
nuclear@0 26 warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
nuclear@0 27 }
nuclear@0 28
nuclear@0 29 /* Alternate create PNG structure for reading, and allocate any memory needed. */
nuclear@0 30 png_structp PNGAPI
nuclear@0 31 png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@0 32 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@0 33 png_malloc_ptr malloc_fn, png_free_ptr free_fn)
nuclear@0 34 {
nuclear@0 35 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 36
nuclear@0 37 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 38 volatile
nuclear@0 39 #endif
nuclear@0 40 png_structp png_ptr;
nuclear@0 41
nuclear@0 42 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 43 #ifdef USE_FAR_KEYWORD
nuclear@0 44 jmp_buf jmpbuf;
nuclear@0 45 #endif
nuclear@0 46 #endif
nuclear@0 47
nuclear@0 48 int i;
nuclear@0 49
nuclear@0 50 png_debug(1, "in png_create_read_struct\n");
nuclear@0 51 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 52 png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
nuclear@0 53 (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
nuclear@0 54 #else
nuclear@0 55 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@0 56 #endif
nuclear@0 57 if (png_ptr == NULL)
nuclear@0 58 return (NULL);
nuclear@0 59
nuclear@0 60 /* added at libpng-1.2.6 */
nuclear@0 61 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@0 62 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@0 63 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@0 64 #endif
nuclear@0 65
nuclear@0 66 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 67 #ifdef USE_FAR_KEYWORD
nuclear@0 68 if (setjmp(jmpbuf))
nuclear@0 69 #else
nuclear@0 70 if (setjmp(png_ptr->jmpbuf))
nuclear@0 71 #endif
nuclear@0 72 {
nuclear@0 73 png_free(png_ptr, png_ptr->zbuf);
nuclear@0 74 png_ptr->zbuf = NULL;
nuclear@0 75 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 76 png_destroy_struct_2((png_voidp)png_ptr,
nuclear@0 77 (png_free_ptr)free_fn, (png_voidp)mem_ptr);
nuclear@0 78 #else
nuclear@0 79 png_destroy_struct((png_voidp)png_ptr);
nuclear@0 80 #endif
nuclear@0 81 return (NULL);
nuclear@0 82 }
nuclear@0 83 #ifdef USE_FAR_KEYWORD
nuclear@0 84 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@0 85 #endif
nuclear@0 86 #endif
nuclear@0 87
nuclear@0 88 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 89 png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
nuclear@0 90 #endif
nuclear@0 91
nuclear@0 92 png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
nuclear@0 93
nuclear@0 94 if (user_png_ver)
nuclear@0 95 {
nuclear@0 96 i = 0;
nuclear@0 97 do
nuclear@0 98 {
nuclear@0 99 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@0 100 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@0 101 } while (png_libpng_ver[i++]);
nuclear@0 102 }
nuclear@0 103 else
nuclear@0 104 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@0 105
nuclear@0 106
nuclear@0 107 if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
nuclear@0 108 {
nuclear@0 109 /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
nuclear@0 110 * we must recompile any applications that use any older library version.
nuclear@0 111 * For versions after libpng 1.0, we will be compatible, so we need
nuclear@0 112 * only check the first digit.
nuclear@0 113 */
nuclear@0 114 if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
nuclear@0 115 (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
nuclear@0 116 (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
nuclear@0 117 {
nuclear@0 118 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@0 119 char msg[80];
nuclear@0 120 if (user_png_ver)
nuclear@0 121 {
nuclear@0 122 png_snprintf(msg, 80,
nuclear@0 123 "Application was compiled with png.h from libpng-%.20s",
nuclear@0 124 user_png_ver);
nuclear@0 125 png_warning(png_ptr, msg);
nuclear@0 126 }
nuclear@0 127 png_snprintf(msg, 80,
nuclear@0 128 "Application is running with png.c from libpng-%.20s",
nuclear@0 129 png_libpng_ver);
nuclear@0 130 png_warning(png_ptr, msg);
nuclear@0 131 #endif
nuclear@0 132 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@0 133 png_ptr->flags = 0;
nuclear@0 134 #endif
nuclear@0 135 png_error(png_ptr,
nuclear@0 136 "Incompatible libpng version in application and library");
nuclear@0 137 }
nuclear@0 138 }
nuclear@0 139
nuclear@0 140 /* initialize zbuf - compression buffer */
nuclear@0 141 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@0 142 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@0 143 (png_uint_32)png_ptr->zbuf_size);
nuclear@0 144 png_ptr->zstream.zalloc = png_zalloc;
nuclear@0 145 png_ptr->zstream.zfree = png_zfree;
nuclear@0 146 png_ptr->zstream.opaque = (voidpf)png_ptr;
nuclear@0 147
nuclear@0 148 switch (inflateInit(&png_ptr->zstream))
nuclear@0 149 {
nuclear@0 150 case Z_OK: /* Do nothing */ break;
nuclear@0 151 case Z_MEM_ERROR:
nuclear@0 152 case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;
nuclear@0 153 case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break;
nuclear@0 154 default: png_error(png_ptr, "Unknown zlib error");
nuclear@0 155 }
nuclear@0 156
nuclear@0 157 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@0 158 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@0 159
nuclear@0 160 png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
nuclear@0 161
nuclear@0 162 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 163 /* Applications that neglect to set up their own setjmp() and then encounter
nuclear@0 164 a png_error() will longjmp here. Since the jmpbuf is then meaningless we
nuclear@0 165 abort instead of returning. */
nuclear@0 166 #ifdef USE_FAR_KEYWORD
nuclear@0 167 if (setjmp(jmpbuf))
nuclear@0 168 PNG_ABORT();
nuclear@0 169 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@0 170 #else
nuclear@0 171 if (setjmp(png_ptr->jmpbuf))
nuclear@0 172 PNG_ABORT();
nuclear@0 173 #endif
nuclear@0 174 #endif
nuclear@0 175 return (png_ptr);
nuclear@0 176 }
nuclear@0 177
nuclear@0 178 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
nuclear@0 179 /* Initialize PNG structure for reading, and allocate any memory needed.
nuclear@0 180 This interface is deprecated in favour of the png_create_read_struct(),
nuclear@0 181 and it will disappear as of libpng-1.3.0. */
nuclear@0 182 #undef png_read_init
nuclear@0 183 void PNGAPI
nuclear@0 184 png_read_init(png_structp png_ptr)
nuclear@0 185 {
nuclear@0 186 /* We only come here via pre-1.0.7-compiled applications */
nuclear@0 187 png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
nuclear@0 188 }
nuclear@0 189
nuclear@0 190 void PNGAPI
nuclear@0 191 png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
nuclear@0 192 png_size_t png_struct_size, png_size_t png_info_size)
nuclear@0 193 {
nuclear@0 194 /* We only come here via pre-1.0.12-compiled applications */
nuclear@0 195 if (png_ptr == NULL) return;
nuclear@0 196 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@0 197 if (png_sizeof(png_struct) > png_struct_size ||
nuclear@0 198 png_sizeof(png_info) > png_info_size)
nuclear@0 199 {
nuclear@0 200 char msg[80];
nuclear@0 201 png_ptr->warning_fn = NULL;
nuclear@0 202 if (user_png_ver)
nuclear@0 203 {
nuclear@0 204 png_snprintf(msg, 80,
nuclear@0 205 "Application was compiled with png.h from libpng-%.20s",
nuclear@0 206 user_png_ver);
nuclear@0 207 png_warning(png_ptr, msg);
nuclear@0 208 }
nuclear@0 209 png_snprintf(msg, 80,
nuclear@0 210 "Application is running with png.c from libpng-%.20s",
nuclear@0 211 png_libpng_ver);
nuclear@0 212 png_warning(png_ptr, msg);
nuclear@0 213 }
nuclear@0 214 #endif
nuclear@0 215 if (png_sizeof(png_struct) > png_struct_size)
nuclear@0 216 {
nuclear@0 217 png_ptr->error_fn = NULL;
nuclear@0 218 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@0 219 png_ptr->flags = 0;
nuclear@0 220 #endif
nuclear@0 221 png_error(png_ptr,
nuclear@0 222 "The png struct allocated by the application for reading is too small.");
nuclear@0 223 }
nuclear@0 224 if (png_sizeof(png_info) > png_info_size)
nuclear@0 225 {
nuclear@0 226 png_ptr->error_fn = NULL;
nuclear@0 227 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@0 228 png_ptr->flags = 0;
nuclear@0 229 #endif
nuclear@0 230 png_error(png_ptr,
nuclear@0 231 "The info struct allocated by application for reading is too small.");
nuclear@0 232 }
nuclear@0 233 png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
nuclear@0 234 }
nuclear@0 235 #endif /* PNG_1_0_X || PNG_1_2_X */
nuclear@0 236
nuclear@0 237 void PNGAPI
nuclear@0 238 png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
nuclear@0 239 png_size_t png_struct_size)
nuclear@0 240 {
nuclear@0 241 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 242 jmp_buf tmp_jmp; /* to save current jump buffer */
nuclear@0 243 #endif
nuclear@0 244
nuclear@0 245 int i = 0;
nuclear@0 246
nuclear@0 247 png_structp png_ptr=*ptr_ptr;
nuclear@0 248
nuclear@0 249 if (png_ptr == NULL) return;
nuclear@0 250
nuclear@0 251 do
nuclear@0 252 {
nuclear@0 253 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@0 254 {
nuclear@0 255 #ifdef PNG_LEGACY_SUPPORTED
nuclear@0 256 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@0 257 #else
nuclear@0 258 png_ptr->warning_fn = NULL;
nuclear@0 259 png_warning(png_ptr,
nuclear@0 260 "Application uses deprecated png_read_init() and should be recompiled.");
nuclear@0 261 break;
nuclear@0 262 #endif
nuclear@0 263 }
nuclear@0 264 } while (png_libpng_ver[i++]);
nuclear@0 265
nuclear@0 266 png_debug(1, "in png_read_init_3\n");
nuclear@0 267
nuclear@0 268 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 269 /* save jump buffer and error functions */
nuclear@0 270 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@0 271 #endif
nuclear@0 272
nuclear@0 273 if (png_sizeof(png_struct) > png_struct_size)
nuclear@0 274 {
nuclear@0 275 png_destroy_struct(png_ptr);
nuclear@0 276 *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@0 277 png_ptr = *ptr_ptr;
nuclear@0 278 }
nuclear@0 279
nuclear@0 280 /* reset all variables to 0 */
nuclear@0 281 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@0 282
nuclear@0 283 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 284 /* restore jump buffer */
nuclear@0 285 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@0 286 #endif
nuclear@0 287
nuclear@0 288 /* added at libpng-1.2.6 */
nuclear@0 289 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@0 290 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@0 291 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@0 292 #endif
nuclear@0 293
nuclear@0 294 /* initialize zbuf - compression buffer */
nuclear@0 295 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@0 296 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@0 297 (png_uint_32)png_ptr->zbuf_size);
nuclear@0 298 png_ptr->zstream.zalloc = png_zalloc;
nuclear@0 299 png_ptr->zstream.zfree = png_zfree;
nuclear@0 300 png_ptr->zstream.opaque = (voidpf)png_ptr;
nuclear@0 301
nuclear@0 302 switch (inflateInit(&png_ptr->zstream))
nuclear@0 303 {
nuclear@0 304 case Z_OK: /* Do nothing */ break;
nuclear@0 305 case Z_MEM_ERROR:
nuclear@0 306 case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break;
nuclear@0 307 case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break;
nuclear@0 308 default: png_error(png_ptr, "Unknown zlib error");
nuclear@0 309 }
nuclear@0 310
nuclear@0 311 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@0 312 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@0 313
nuclear@0 314 png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
nuclear@0 315 }
nuclear@0 316
nuclear@0 317 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@0 318 /* Read the information before the actual image data. This has been
nuclear@0 319 * changed in v0.90 to allow reading a file that already has the magic
nuclear@0 320 * bytes read from the stream. You can tell libpng how many bytes have
nuclear@0 321 * been read from the beginning of the stream (up to the maximum of 8)
nuclear@0 322 * via png_set_sig_bytes(), and we will only check the remaining bytes
nuclear@0 323 * here. The application can then have access to the signature bytes we
nuclear@0 324 * read if it is determined that this isn't a valid PNG file.
nuclear@0 325 */
nuclear@0 326 void PNGAPI
nuclear@0 327 png_read_info(png_structp png_ptr, png_infop info_ptr)
nuclear@0 328 {
nuclear@0 329 if (png_ptr == NULL || info_ptr == NULL) return;
nuclear@0 330 png_debug(1, "in png_read_info\n");
nuclear@0 331 /* If we haven't checked all of the PNG signature bytes, do so now. */
nuclear@0 332 if (png_ptr->sig_bytes < 8)
nuclear@0 333 {
nuclear@0 334 png_size_t num_checked = png_ptr->sig_bytes,
nuclear@0 335 num_to_check = 8 - num_checked;
nuclear@0 336
nuclear@0 337 png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
nuclear@0 338 png_ptr->sig_bytes = 8;
nuclear@0 339
nuclear@0 340 if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
nuclear@0 341 {
nuclear@0 342 if (num_checked < 4 &&
nuclear@0 343 png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
nuclear@0 344 png_error(png_ptr, "Not a PNG file");
nuclear@0 345 else
nuclear@0 346 png_error(png_ptr, "PNG file corrupted by ASCII conversion");
nuclear@0 347 }
nuclear@0 348 if (num_checked < 3)
nuclear@0 349 png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
nuclear@0 350 }
nuclear@0 351
nuclear@0 352 for (;;)
nuclear@0 353 {
nuclear@0 354 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@0 355 PNG_CONST PNG_IHDR;
nuclear@0 356 PNG_CONST PNG_IDAT;
nuclear@0 357 PNG_CONST PNG_IEND;
nuclear@0 358 PNG_CONST PNG_PLTE;
nuclear@0 359 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@0 360 PNG_CONST PNG_bKGD;
nuclear@0 361 #endif
nuclear@0 362 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@0 363 PNG_CONST PNG_cHRM;
nuclear@0 364 #endif
nuclear@0 365 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@0 366 PNG_CONST PNG_gAMA;
nuclear@0 367 #endif
nuclear@0 368 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@0 369 PNG_CONST PNG_hIST;
nuclear@0 370 #endif
nuclear@0 371 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@0 372 PNG_CONST PNG_iCCP;
nuclear@0 373 #endif
nuclear@0 374 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@0 375 PNG_CONST PNG_iTXt;
nuclear@0 376 #endif
nuclear@0 377 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@0 378 PNG_CONST PNG_oFFs;
nuclear@0 379 #endif
nuclear@0 380 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@0 381 PNG_CONST PNG_pCAL;
nuclear@0 382 #endif
nuclear@0 383 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@0 384 PNG_CONST PNG_pHYs;
nuclear@0 385 #endif
nuclear@0 386 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@0 387 PNG_CONST PNG_sBIT;
nuclear@0 388 #endif
nuclear@0 389 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@0 390 PNG_CONST PNG_sCAL;
nuclear@0 391 #endif
nuclear@0 392 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@0 393 PNG_CONST PNG_sPLT;
nuclear@0 394 #endif
nuclear@0 395 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@0 396 PNG_CONST PNG_sRGB;
nuclear@0 397 #endif
nuclear@0 398 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@0 399 PNG_CONST PNG_tEXt;
nuclear@0 400 #endif
nuclear@0 401 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@0 402 PNG_CONST PNG_tIME;
nuclear@0 403 #endif
nuclear@0 404 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@0 405 PNG_CONST PNG_tRNS;
nuclear@0 406 #endif
nuclear@0 407 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@0 408 PNG_CONST PNG_zTXt;
nuclear@0 409 #endif
nuclear@0 410 #endif /* PNG_USE_LOCAL_ARRAYS */
nuclear@0 411 png_uint_32 length = png_read_chunk_header(png_ptr);
nuclear@0 412 PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
nuclear@0 413
nuclear@0 414 /* This should be a binary subdivision search or a hash for
nuclear@0 415 * matching the chunk name rather than a linear search.
nuclear@0 416 */
nuclear@0 417 if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@0 418 if (png_ptr->mode & PNG_AFTER_IDAT)
nuclear@0 419 png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
nuclear@0 420
nuclear@0 421 if (!png_memcmp(chunk_name, png_IHDR, 4))
nuclear@0 422 png_handle_IHDR(png_ptr, info_ptr, length);
nuclear@0 423 else if (!png_memcmp(chunk_name, png_IEND, 4))
nuclear@0 424 png_handle_IEND(png_ptr, info_ptr, length);
nuclear@0 425 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@0 426 else if (png_handle_as_unknown(png_ptr, chunk_name))
nuclear@0 427 {
nuclear@0 428 if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@0 429 png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@0 430 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@0 431 if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@0 432 png_ptr->mode |= PNG_HAVE_PLTE;
nuclear@0 433 else if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@0 434 {
nuclear@0 435 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@0 436 png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@0 437 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@0 438 !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@0 439 png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@0 440 break;
nuclear@0 441 }
nuclear@0 442 }
nuclear@0 443 #endif
nuclear@0 444 else if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@0 445 png_handle_PLTE(png_ptr, info_ptr, length);
nuclear@0 446 else if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@0 447 {
nuclear@0 448 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@0 449 png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@0 450 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@0 451 !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@0 452 png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@0 453
nuclear@0 454 png_ptr->idat_size = length;
nuclear@0 455 png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@0 456 break;
nuclear@0 457 }
nuclear@0 458 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@0 459 else if (!png_memcmp(chunk_name, png_bKGD, 4))
nuclear@0 460 png_handle_bKGD(png_ptr, info_ptr, length);
nuclear@0 461 #endif
nuclear@0 462 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@0 463 else if (!png_memcmp(chunk_name, png_cHRM, 4))
nuclear@0 464 png_handle_cHRM(png_ptr, info_ptr, length);
nuclear@0 465 #endif
nuclear@0 466 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@0 467 else if (!png_memcmp(chunk_name, png_gAMA, 4))
nuclear@0 468 png_handle_gAMA(png_ptr, info_ptr, length);
nuclear@0 469 #endif
nuclear@0 470 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@0 471 else if (!png_memcmp(chunk_name, png_hIST, 4))
nuclear@0 472 png_handle_hIST(png_ptr, info_ptr, length);
nuclear@0 473 #endif
nuclear@0 474 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@0 475 else if (!png_memcmp(chunk_name, png_oFFs, 4))
nuclear@0 476 png_handle_oFFs(png_ptr, info_ptr, length);
nuclear@0 477 #endif
nuclear@0 478 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@0 479 else if (!png_memcmp(chunk_name, png_pCAL, 4))
nuclear@0 480 png_handle_pCAL(png_ptr, info_ptr, length);
nuclear@0 481 #endif
nuclear@0 482 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@0 483 else if (!png_memcmp(chunk_name, png_sCAL, 4))
nuclear@0 484 png_handle_sCAL(png_ptr, info_ptr, length);
nuclear@0 485 #endif
nuclear@0 486 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@0 487 else if (!png_memcmp(chunk_name, png_pHYs, 4))
nuclear@0 488 png_handle_pHYs(png_ptr, info_ptr, length);
nuclear@0 489 #endif
nuclear@0 490 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@0 491 else if (!png_memcmp(chunk_name, png_sBIT, 4))
nuclear@0 492 png_handle_sBIT(png_ptr, info_ptr, length);
nuclear@0 493 #endif
nuclear@0 494 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@0 495 else if (!png_memcmp(chunk_name, png_sRGB, 4))
nuclear@0 496 png_handle_sRGB(png_ptr, info_ptr, length);
nuclear@0 497 #endif
nuclear@0 498 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@0 499 else if (!png_memcmp(chunk_name, png_iCCP, 4))
nuclear@0 500 png_handle_iCCP(png_ptr, info_ptr, length);
nuclear@0 501 #endif
nuclear@0 502 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@0 503 else if (!png_memcmp(chunk_name, png_sPLT, 4))
nuclear@0 504 png_handle_sPLT(png_ptr, info_ptr, length);
nuclear@0 505 #endif
nuclear@0 506 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@0 507 else if (!png_memcmp(chunk_name, png_tEXt, 4))
nuclear@0 508 png_handle_tEXt(png_ptr, info_ptr, length);
nuclear@0 509 #endif
nuclear@0 510 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@0 511 else if (!png_memcmp(chunk_name, png_tIME, 4))
nuclear@0 512 png_handle_tIME(png_ptr, info_ptr, length);
nuclear@0 513 #endif
nuclear@0 514 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@0 515 else if (!png_memcmp(chunk_name, png_tRNS, 4))
nuclear@0 516 png_handle_tRNS(png_ptr, info_ptr, length);
nuclear@0 517 #endif
nuclear@0 518 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@0 519 else if (!png_memcmp(chunk_name, png_zTXt, 4))
nuclear@0 520 png_handle_zTXt(png_ptr, info_ptr, length);
nuclear@0 521 #endif
nuclear@0 522 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@0 523 else if (!png_memcmp(chunk_name, png_iTXt, 4))
nuclear@0 524 png_handle_iTXt(png_ptr, info_ptr, length);
nuclear@0 525 #endif
nuclear@0 526 else
nuclear@0 527 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@0 528 }
nuclear@0 529 }
nuclear@0 530 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@0 531
nuclear@0 532 /* optional call to update the users info_ptr structure */
nuclear@0 533 void PNGAPI
nuclear@0 534 png_read_update_info(png_structp png_ptr, png_infop info_ptr)
nuclear@0 535 {
nuclear@0 536 png_debug(1, "in png_read_update_info\n");
nuclear@0 537 if (png_ptr == NULL) return;
nuclear@0 538 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
nuclear@0 539 png_read_start_row(png_ptr);
nuclear@0 540 else
nuclear@0 541 png_warning(png_ptr,
nuclear@0 542 "Ignoring extra png_read_update_info() call; row buffer not reallocated");
nuclear@0 543 png_read_transform_info(png_ptr, info_ptr);
nuclear@0 544 }
nuclear@0 545
nuclear@0 546 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@0 547 /* Initialize palette, background, etc, after transformations
nuclear@0 548 * are set, but before any reading takes place. This allows
nuclear@0 549 * the user to obtain a gamma-corrected palette, for example.
nuclear@0 550 * If the user doesn't call this, we will do it ourselves.
nuclear@0 551 */
nuclear@0 552 void PNGAPI
nuclear@0 553 png_start_read_image(png_structp png_ptr)
nuclear@0 554 {
nuclear@0 555 png_debug(1, "in png_start_read_image\n");
nuclear@0 556 if (png_ptr == NULL) return;
nuclear@0 557 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
nuclear@0 558 png_read_start_row(png_ptr);
nuclear@0 559 }
nuclear@0 560 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@0 561
nuclear@0 562 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@0 563 void PNGAPI
nuclear@0 564 png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
nuclear@0 565 {
nuclear@0 566 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@0 567 PNG_CONST PNG_IDAT;
nuclear@0 568 PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
nuclear@0 569 0xff};
nuclear@0 570 PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
nuclear@0 571 #endif
nuclear@0 572 int ret;
nuclear@0 573 if (png_ptr == NULL) return;
nuclear@0 574 png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
nuclear@0 575 png_ptr->row_number, png_ptr->pass);
nuclear@0 576 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
nuclear@0 577 png_read_start_row(png_ptr);
nuclear@0 578 if (png_ptr->row_number == 0 && png_ptr->pass == 0)
nuclear@0 579 {
nuclear@0 580 /* check for transforms that have been set but were defined out */
nuclear@0 581 #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
nuclear@0 582 if (png_ptr->transformations & PNG_INVERT_MONO)
nuclear@0 583 png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
nuclear@0 584 #endif
nuclear@0 585 #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
nuclear@0 586 if (png_ptr->transformations & PNG_FILLER)
nuclear@0 587 png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined.");
nuclear@0 588 #endif
nuclear@0 589 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@0 590 if (png_ptr->transformations & PNG_PACKSWAP)
nuclear@0 591 png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined.");
nuclear@0 592 #endif
nuclear@0 593 #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
nuclear@0 594 if (png_ptr->transformations & PNG_PACK)
nuclear@0 595 png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined.");
nuclear@0 596 #endif
nuclear@0 597 #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@0 598 if (png_ptr->transformations & PNG_SHIFT)
nuclear@0 599 png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined.");
nuclear@0 600 #endif
nuclear@0 601 #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
nuclear@0 602 if (png_ptr->transformations & PNG_BGR)
nuclear@0 603 png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined.");
nuclear@0 604 #endif
nuclear@0 605 #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
nuclear@0 606 if (png_ptr->transformations & PNG_SWAP_BYTES)
nuclear@0 607 png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined.");
nuclear@0 608 #endif
nuclear@0 609 }
nuclear@0 610
nuclear@0 611 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@0 612 /* if interlaced and we do not need a new row, combine row and return */
nuclear@0 613 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
nuclear@0 614 {
nuclear@0 615 switch (png_ptr->pass)
nuclear@0 616 {
nuclear@0 617 case 0:
nuclear@0 618 if (png_ptr->row_number & 0x07)
nuclear@0 619 {
nuclear@0 620 if (dsp_row != NULL)
nuclear@0 621 png_combine_row(png_ptr, dsp_row,
nuclear@0 622 png_pass_dsp_mask[png_ptr->pass]);
nuclear@0 623 png_read_finish_row(png_ptr);
nuclear@0 624 return;
nuclear@0 625 }
nuclear@0 626 break;
nuclear@0 627 case 1:
nuclear@0 628 if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
nuclear@0 629 {
nuclear@0 630 if (dsp_row != NULL)
nuclear@0 631 png_combine_row(png_ptr, dsp_row,
nuclear@0 632 png_pass_dsp_mask[png_ptr->pass]);
nuclear@0 633 png_read_finish_row(png_ptr);
nuclear@0 634 return;
nuclear@0 635 }
nuclear@0 636 break;
nuclear@0 637 case 2:
nuclear@0 638 if ((png_ptr->row_number & 0x07) != 4)
nuclear@0 639 {
nuclear@0 640 if (dsp_row != NULL && (png_ptr->row_number & 4))
nuclear@0 641 png_combine_row(png_ptr, dsp_row,
nuclear@0 642 png_pass_dsp_mask[png_ptr->pass]);
nuclear@0 643 png_read_finish_row(png_ptr);
nuclear@0 644 return;
nuclear@0 645 }
nuclear@0 646 break;
nuclear@0 647 case 3:
nuclear@0 648 if ((png_ptr->row_number & 3) || png_ptr->width < 3)
nuclear@0 649 {
nuclear@0 650 if (dsp_row != NULL)
nuclear@0 651 png_combine_row(png_ptr, dsp_row,
nuclear@0 652 png_pass_dsp_mask[png_ptr->pass]);
nuclear@0 653 png_read_finish_row(png_ptr);
nuclear@0 654 return;
nuclear@0 655 }
nuclear@0 656 break;
nuclear@0 657 case 4:
nuclear@0 658 if ((png_ptr->row_number & 3) != 2)
nuclear@0 659 {
nuclear@0 660 if (dsp_row != NULL && (png_ptr->row_number & 2))
nuclear@0 661 png_combine_row(png_ptr, dsp_row,
nuclear@0 662 png_pass_dsp_mask[png_ptr->pass]);
nuclear@0 663 png_read_finish_row(png_ptr);
nuclear@0 664 return;
nuclear@0 665 }
nuclear@0 666 break;
nuclear@0 667 case 5:
nuclear@0 668 if ((png_ptr->row_number & 1) || png_ptr->width < 2)
nuclear@0 669 {
nuclear@0 670 if (dsp_row != NULL)
nuclear@0 671 png_combine_row(png_ptr, dsp_row,
nuclear@0 672 png_pass_dsp_mask[png_ptr->pass]);
nuclear@0 673 png_read_finish_row(png_ptr);
nuclear@0 674 return;
nuclear@0 675 }
nuclear@0 676 break;
nuclear@0 677 case 6:
nuclear@0 678 if (!(png_ptr->row_number & 1))
nuclear@0 679 {
nuclear@0 680 png_read_finish_row(png_ptr);
nuclear@0 681 return;
nuclear@0 682 }
nuclear@0 683 break;
nuclear@0 684 }
nuclear@0 685 }
nuclear@0 686 #endif
nuclear@0 687
nuclear@0 688 if (!(png_ptr->mode & PNG_HAVE_IDAT))
nuclear@0 689 png_error(png_ptr, "Invalid attempt to read row data");
nuclear@0 690
nuclear@0 691 png_ptr->zstream.next_out = png_ptr->row_buf;
nuclear@0 692 png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
nuclear@0 693 do
nuclear@0 694 {
nuclear@0 695 if (!(png_ptr->zstream.avail_in))
nuclear@0 696 {
nuclear@0 697 while (!png_ptr->idat_size)
nuclear@0 698 {
nuclear@0 699 png_crc_finish(png_ptr, 0);
nuclear@0 700
nuclear@0 701 png_ptr->idat_size = png_read_chunk_header(png_ptr);
nuclear@0 702 if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@0 703 png_error(png_ptr, "Not enough image data");
nuclear@0 704 }
nuclear@0 705 png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
nuclear@0 706 png_ptr->zstream.next_in = png_ptr->zbuf;
nuclear@0 707 if (png_ptr->zbuf_size > png_ptr->idat_size)
nuclear@0 708 png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
nuclear@0 709 png_crc_read(png_ptr, png_ptr->zbuf,
nuclear@0 710 (png_size_t)png_ptr->zstream.avail_in);
nuclear@0 711 png_ptr->idat_size -= png_ptr->zstream.avail_in;
nuclear@0 712 }
nuclear@0 713 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
nuclear@0 714 if (ret == Z_STREAM_END)
nuclear@0 715 {
nuclear@0 716 if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||
nuclear@0 717 png_ptr->idat_size)
nuclear@0 718 png_error(png_ptr, "Extra compressed data");
nuclear@0 719 png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@0 720 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
nuclear@0 721 break;
nuclear@0 722 }
nuclear@0 723 if (ret != Z_OK)
nuclear@0 724 png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
nuclear@0 725 "Decompression error");
nuclear@0 726
nuclear@0 727 } while (png_ptr->zstream.avail_out);
nuclear@0 728
nuclear@0 729 png_ptr->row_info.color_type = png_ptr->color_type;
nuclear@0 730 png_ptr->row_info.width = png_ptr->iwidth;
nuclear@0 731 png_ptr->row_info.channels = png_ptr->channels;
nuclear@0 732 png_ptr->row_info.bit_depth = png_ptr->bit_depth;
nuclear@0 733 png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
nuclear@0 734 png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
nuclear@0 735 png_ptr->row_info.width);
nuclear@0 736
nuclear@0 737 if (png_ptr->row_buf[0])
nuclear@0 738 png_read_filter_row(png_ptr, &(png_ptr->row_info),
nuclear@0 739 png_ptr->row_buf + 1, png_ptr->prev_row + 1,
nuclear@0 740 (int)(png_ptr->row_buf[0]));
nuclear@0 741
nuclear@0 742 png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
nuclear@0 743 png_ptr->rowbytes + 1);
nuclear@0 744
nuclear@0 745 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@0 746 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
nuclear@0 747 (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
nuclear@0 748 {
nuclear@0 749 /* Intrapixel differencing */
nuclear@0 750 png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
nuclear@0 751 }
nuclear@0 752 #endif
nuclear@0 753
nuclear@0 754
nuclear@0 755 if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
nuclear@0 756 png_do_read_transformations(png_ptr);
nuclear@0 757
nuclear@0 758 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@0 759 /* blow up interlaced rows to full size */
nuclear@0 760 if (png_ptr->interlaced &&
nuclear@0 761 (png_ptr->transformations & PNG_INTERLACE))
nuclear@0 762 {
nuclear@0 763 if (png_ptr->pass < 6)
nuclear@0 764 /* old interface (pre-1.0.9):
nuclear@0 765 png_do_read_interlace(&(png_ptr->row_info),
nuclear@0 766 png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
nuclear@0 767 */
nuclear@0 768 png_do_read_interlace(png_ptr);
nuclear@0 769
nuclear@0 770 if (dsp_row != NULL)
nuclear@0 771 png_combine_row(png_ptr, dsp_row,
nuclear@0 772 png_pass_dsp_mask[png_ptr->pass]);
nuclear@0 773 if (row != NULL)
nuclear@0 774 png_combine_row(png_ptr, row,
nuclear@0 775 png_pass_mask[png_ptr->pass]);
nuclear@0 776 }
nuclear@0 777 else
nuclear@0 778 #endif
nuclear@0 779 {
nuclear@0 780 if (row != NULL)
nuclear@0 781 png_combine_row(png_ptr, row, 0xff);
nuclear@0 782 if (dsp_row != NULL)
nuclear@0 783 png_combine_row(png_ptr, dsp_row, 0xff);
nuclear@0 784 }
nuclear@0 785 png_read_finish_row(png_ptr);
nuclear@0 786
nuclear@0 787 if (png_ptr->read_row_fn != NULL)
nuclear@0 788 (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
nuclear@0 789 }
nuclear@0 790 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@0 791
nuclear@0 792 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@0 793 /* Read one or more rows of image data. If the image is interlaced,
nuclear@0 794 * and png_set_interlace_handling() has been called, the rows need to
nuclear@0 795 * contain the contents of the rows from the previous pass. If the
nuclear@0 796 * image has alpha or transparency, and png_handle_alpha()[*] has been
nuclear@0 797 * called, the rows contents must be initialized to the contents of the
nuclear@0 798 * screen.
nuclear@0 799 *
nuclear@0 800 * "row" holds the actual image, and pixels are placed in it
nuclear@0 801 * as they arrive. If the image is displayed after each pass, it will
nuclear@0 802 * appear to "sparkle" in. "display_row" can be used to display a
nuclear@0 803 * "chunky" progressive image, with finer detail added as it becomes
nuclear@0 804 * available. If you do not want this "chunky" display, you may pass
nuclear@0 805 * NULL for display_row. If you do not want the sparkle display, and
nuclear@0 806 * you have not called png_handle_alpha(), you may pass NULL for rows.
nuclear@0 807 * If you have called png_handle_alpha(), and the image has either an
nuclear@0 808 * alpha channel or a transparency chunk, you must provide a buffer for
nuclear@0 809 * rows. In this case, you do not have to provide a display_row buffer
nuclear@0 810 * also, but you may. If the image is not interlaced, or if you have
nuclear@0 811 * not called png_set_interlace_handling(), the display_row buffer will
nuclear@0 812 * be ignored, so pass NULL to it.
nuclear@0 813 *
nuclear@0 814 * [*] png_handle_alpha() does not exist yet, as of this version of libpng
nuclear@0 815 */
nuclear@0 816
nuclear@0 817 void PNGAPI
nuclear@0 818 png_read_rows(png_structp png_ptr, png_bytepp row,
nuclear@0 819 png_bytepp display_row, png_uint_32 num_rows)
nuclear@0 820 {
nuclear@0 821 png_uint_32 i;
nuclear@0 822 png_bytepp rp;
nuclear@0 823 png_bytepp dp;
nuclear@0 824
nuclear@0 825 png_debug(1, "in png_read_rows\n");
nuclear@0 826 if (png_ptr == NULL) return;
nuclear@0 827 rp = row;
nuclear@0 828 dp = display_row;
nuclear@0 829 if (rp != NULL && dp != NULL)
nuclear@0 830 for (i = 0; i < num_rows; i++)
nuclear@0 831 {
nuclear@0 832 png_bytep rptr = *rp++;
nuclear@0 833 png_bytep dptr = *dp++;
nuclear@0 834
nuclear@0 835 png_read_row(png_ptr, rptr, dptr);
nuclear@0 836 }
nuclear@0 837 else if (rp != NULL)
nuclear@0 838 for (i = 0; i < num_rows; i++)
nuclear@0 839 {
nuclear@0 840 png_bytep rptr = *rp;
nuclear@0 841 png_read_row(png_ptr, rptr, png_bytep_NULL);
nuclear@0 842 rp++;
nuclear@0 843 }
nuclear@0 844 else if (dp != NULL)
nuclear@0 845 for (i = 0; i < num_rows; i++)
nuclear@0 846 {
nuclear@0 847 png_bytep dptr = *dp;
nuclear@0 848 png_read_row(png_ptr, png_bytep_NULL, dptr);
nuclear@0 849 dp++;
nuclear@0 850 }
nuclear@0 851 }
nuclear@0 852 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@0 853
nuclear@0 854 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@0 855 /* Read the entire image. If the image has an alpha channel or a tRNS
nuclear@0 856 * chunk, and you have called png_handle_alpha()[*], you will need to
nuclear@0 857 * initialize the image to the current image that PNG will be overlaying.
nuclear@0 858 * We set the num_rows again here, in case it was incorrectly set in
nuclear@0 859 * png_read_start_row() by a call to png_read_update_info() or
nuclear@0 860 * png_start_read_image() if png_set_interlace_handling() wasn't called
nuclear@0 861 * prior to either of these functions like it should have been. You can
nuclear@0 862 * only call this function once. If you desire to have an image for
nuclear@0 863 * each pass of a interlaced image, use png_read_rows() instead.
nuclear@0 864 *
nuclear@0 865 * [*] png_handle_alpha() does not exist yet, as of this version of libpng
nuclear@0 866 */
nuclear@0 867 void PNGAPI
nuclear@0 868 png_read_image(png_structp png_ptr, png_bytepp image)
nuclear@0 869 {
nuclear@0 870 png_uint_32 i, image_height;
nuclear@0 871 int pass, j;
nuclear@0 872 png_bytepp rp;
nuclear@0 873
nuclear@0 874 png_debug(1, "in png_read_image\n");
nuclear@0 875 if (png_ptr == NULL) return;
nuclear@0 876
nuclear@0 877 #ifdef PNG_READ_INTERLACING_SUPPORTED
nuclear@0 878 pass = png_set_interlace_handling(png_ptr);
nuclear@0 879 #else
nuclear@0 880 if (png_ptr->interlaced)
nuclear@0 881 png_error(png_ptr,
nuclear@0 882 "Cannot read interlaced image -- interlace handler disabled.");
nuclear@0 883 pass = 1;
nuclear@0 884 #endif
nuclear@0 885
nuclear@0 886
nuclear@0 887 image_height=png_ptr->height;
nuclear@0 888 png_ptr->num_rows = image_height; /* Make sure this is set correctly */
nuclear@0 889
nuclear@0 890 for (j = 0; j < pass; j++)
nuclear@0 891 {
nuclear@0 892 rp = image;
nuclear@0 893 for (i = 0; i < image_height; i++)
nuclear@0 894 {
nuclear@0 895 png_read_row(png_ptr, *rp, png_bytep_NULL);
nuclear@0 896 rp++;
nuclear@0 897 }
nuclear@0 898 }
nuclear@0 899 }
nuclear@0 900 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@0 901
nuclear@0 902 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@0 903 /* Read the end of the PNG file. Will not read past the end of the
nuclear@0 904 * file, will verify the end is accurate, and will read any comments
nuclear@0 905 * or time information at the end of the file, if info is not NULL.
nuclear@0 906 */
nuclear@0 907 void PNGAPI
nuclear@0 908 png_read_end(png_structp png_ptr, png_infop info_ptr)
nuclear@0 909 {
nuclear@0 910 png_debug(1, "in png_read_end\n");
nuclear@0 911 if (png_ptr == NULL) return;
nuclear@0 912 png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
nuclear@0 913
nuclear@0 914 do
nuclear@0 915 {
nuclear@0 916 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@0 917 PNG_CONST PNG_IHDR;
nuclear@0 918 PNG_CONST PNG_IDAT;
nuclear@0 919 PNG_CONST PNG_IEND;
nuclear@0 920 PNG_CONST PNG_PLTE;
nuclear@0 921 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@0 922 PNG_CONST PNG_bKGD;
nuclear@0 923 #endif
nuclear@0 924 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@0 925 PNG_CONST PNG_cHRM;
nuclear@0 926 #endif
nuclear@0 927 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@0 928 PNG_CONST PNG_gAMA;
nuclear@0 929 #endif
nuclear@0 930 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@0 931 PNG_CONST PNG_hIST;
nuclear@0 932 #endif
nuclear@0 933 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@0 934 PNG_CONST PNG_iCCP;
nuclear@0 935 #endif
nuclear@0 936 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@0 937 PNG_CONST PNG_iTXt;
nuclear@0 938 #endif
nuclear@0 939 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@0 940 PNG_CONST PNG_oFFs;
nuclear@0 941 #endif
nuclear@0 942 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@0 943 PNG_CONST PNG_pCAL;
nuclear@0 944 #endif
nuclear@0 945 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@0 946 PNG_CONST PNG_pHYs;
nuclear@0 947 #endif
nuclear@0 948 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@0 949 PNG_CONST PNG_sBIT;
nuclear@0 950 #endif
nuclear@0 951 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@0 952 PNG_CONST PNG_sCAL;
nuclear@0 953 #endif
nuclear@0 954 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@0 955 PNG_CONST PNG_sPLT;
nuclear@0 956 #endif
nuclear@0 957 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@0 958 PNG_CONST PNG_sRGB;
nuclear@0 959 #endif
nuclear@0 960 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@0 961 PNG_CONST PNG_tEXt;
nuclear@0 962 #endif
nuclear@0 963 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@0 964 PNG_CONST PNG_tIME;
nuclear@0 965 #endif
nuclear@0 966 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@0 967 PNG_CONST PNG_tRNS;
nuclear@0 968 #endif
nuclear@0 969 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@0 970 PNG_CONST PNG_zTXt;
nuclear@0 971 #endif
nuclear@0 972 #endif /* PNG_USE_LOCAL_ARRAYS */
nuclear@0 973 png_uint_32 length = png_read_chunk_header(png_ptr);
nuclear@0 974 PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
nuclear@0 975
nuclear@0 976 if (!png_memcmp(chunk_name, png_IHDR, 4))
nuclear@0 977 png_handle_IHDR(png_ptr, info_ptr, length);
nuclear@0 978 else if (!png_memcmp(chunk_name, png_IEND, 4))
nuclear@0 979 png_handle_IEND(png_ptr, info_ptr, length);
nuclear@0 980 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@0 981 else if (png_handle_as_unknown(png_ptr, chunk_name))
nuclear@0 982 {
nuclear@0 983 if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@0 984 {
nuclear@0 985 if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
nuclear@0 986 png_error(png_ptr, "Too many IDAT's found");
nuclear@0 987 }
nuclear@0 988 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@0 989 if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@0 990 png_ptr->mode |= PNG_HAVE_PLTE;
nuclear@0 991 }
nuclear@0 992 #endif
nuclear@0 993 else if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@0 994 {
nuclear@0 995 /* Zero length IDATs are legal after the last IDAT has been
nuclear@0 996 * read, but not after other chunks have been read.
nuclear@0 997 */
nuclear@0 998 if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
nuclear@0 999 png_error(png_ptr, "Too many IDAT's found");
nuclear@0 1000 png_crc_finish(png_ptr, length);
nuclear@0 1001 }
nuclear@0 1002 else if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@0 1003 png_handle_PLTE(png_ptr, info_ptr, length);
nuclear@0 1004 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@0 1005 else if (!png_memcmp(chunk_name, png_bKGD, 4))
nuclear@0 1006 png_handle_bKGD(png_ptr, info_ptr, length);
nuclear@0 1007 #endif
nuclear@0 1008 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@0 1009 else if (!png_memcmp(chunk_name, png_cHRM, 4))
nuclear@0 1010 png_handle_cHRM(png_ptr, info_ptr, length);
nuclear@0 1011 #endif
nuclear@0 1012 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@0 1013 else if (!png_memcmp(chunk_name, png_gAMA, 4))
nuclear@0 1014 png_handle_gAMA(png_ptr, info_ptr, length);
nuclear@0 1015 #endif
nuclear@0 1016 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@0 1017 else if (!png_memcmp(chunk_name, png_hIST, 4))
nuclear@0 1018 png_handle_hIST(png_ptr, info_ptr, length);
nuclear@0 1019 #endif
nuclear@0 1020 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@0 1021 else if (!png_memcmp(chunk_name, png_oFFs, 4))
nuclear@0 1022 png_handle_oFFs(png_ptr, info_ptr, length);
nuclear@0 1023 #endif
nuclear@0 1024 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@0 1025 else if (!png_memcmp(chunk_name, png_pCAL, 4))
nuclear@0 1026 png_handle_pCAL(png_ptr, info_ptr, length);
nuclear@0 1027 #endif
nuclear@0 1028 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@0 1029 else if (!png_memcmp(chunk_name, png_sCAL, 4))
nuclear@0 1030 png_handle_sCAL(png_ptr, info_ptr, length);
nuclear@0 1031 #endif
nuclear@0 1032 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@0 1033 else if (!png_memcmp(chunk_name, png_pHYs, 4))
nuclear@0 1034 png_handle_pHYs(png_ptr, info_ptr, length);
nuclear@0 1035 #endif
nuclear@0 1036 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@0 1037 else if (!png_memcmp(chunk_name, png_sBIT, 4))
nuclear@0 1038 png_handle_sBIT(png_ptr, info_ptr, length);
nuclear@0 1039 #endif
nuclear@0 1040 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@0 1041 else if (!png_memcmp(chunk_name, png_sRGB, 4))
nuclear@0 1042 png_handle_sRGB(png_ptr, info_ptr, length);
nuclear@0 1043 #endif
nuclear@0 1044 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@0 1045 else if (!png_memcmp(chunk_name, png_iCCP, 4))
nuclear@0 1046 png_handle_iCCP(png_ptr, info_ptr, length);
nuclear@0 1047 #endif
nuclear@0 1048 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@0 1049 else if (!png_memcmp(chunk_name, png_sPLT, 4))
nuclear@0 1050 png_handle_sPLT(png_ptr, info_ptr, length);
nuclear@0 1051 #endif
nuclear@0 1052 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@0 1053 else if (!png_memcmp(chunk_name, png_tEXt, 4))
nuclear@0 1054 png_handle_tEXt(png_ptr, info_ptr, length);
nuclear@0 1055 #endif
nuclear@0 1056 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@0 1057 else if (!png_memcmp(chunk_name, png_tIME, 4))
nuclear@0 1058 png_handle_tIME(png_ptr, info_ptr, length);
nuclear@0 1059 #endif
nuclear@0 1060 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@0 1061 else if (!png_memcmp(chunk_name, png_tRNS, 4))
nuclear@0 1062 png_handle_tRNS(png_ptr, info_ptr, length);
nuclear@0 1063 #endif
nuclear@0 1064 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@0 1065 else if (!png_memcmp(chunk_name, png_zTXt, 4))
nuclear@0 1066 png_handle_zTXt(png_ptr, info_ptr, length);
nuclear@0 1067 #endif
nuclear@0 1068 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@0 1069 else if (!png_memcmp(chunk_name, png_iTXt, 4))
nuclear@0 1070 png_handle_iTXt(png_ptr, info_ptr, length);
nuclear@0 1071 #endif
nuclear@0 1072 else
nuclear@0 1073 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@0 1074 } while (!(png_ptr->mode & PNG_HAVE_IEND));
nuclear@0 1075 }
nuclear@0 1076 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@0 1077
nuclear@0 1078 /* free all memory used by the read */
nuclear@0 1079 void PNGAPI
nuclear@0 1080 png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
nuclear@0 1081 png_infopp end_info_ptr_ptr)
nuclear@0 1082 {
nuclear@0 1083 png_structp png_ptr = NULL;
nuclear@0 1084 png_infop info_ptr = NULL, end_info_ptr = NULL;
nuclear@0 1085 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1086 png_free_ptr free_fn = NULL;
nuclear@0 1087 png_voidp mem_ptr = NULL;
nuclear@0 1088 #endif
nuclear@0 1089
nuclear@0 1090 png_debug(1, "in png_destroy_read_struct\n");
nuclear@0 1091 if (png_ptr_ptr != NULL)
nuclear@0 1092 png_ptr = *png_ptr_ptr;
nuclear@0 1093 if (png_ptr == NULL)
nuclear@0 1094 return;
nuclear@0 1095
nuclear@0 1096 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1097 free_fn = png_ptr->free_fn;
nuclear@0 1098 mem_ptr = png_ptr->mem_ptr;
nuclear@0 1099 #endif
nuclear@0 1100
nuclear@0 1101 if (info_ptr_ptr != NULL)
nuclear@0 1102 info_ptr = *info_ptr_ptr;
nuclear@0 1103
nuclear@0 1104 if (end_info_ptr_ptr != NULL)
nuclear@0 1105 end_info_ptr = *end_info_ptr_ptr;
nuclear@0 1106
nuclear@0 1107 png_read_destroy(png_ptr, info_ptr, end_info_ptr);
nuclear@0 1108
nuclear@0 1109 if (info_ptr != NULL)
nuclear@0 1110 {
nuclear@0 1111 #if defined(PNG_TEXT_SUPPORTED)
nuclear@0 1112 png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
nuclear@0 1113 #endif
nuclear@0 1114
nuclear@0 1115 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1116 png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
nuclear@0 1117 (png_voidp)mem_ptr);
nuclear@0 1118 #else
nuclear@0 1119 png_destroy_struct((png_voidp)info_ptr);
nuclear@0 1120 #endif
nuclear@0 1121 *info_ptr_ptr = NULL;
nuclear@0 1122 }
nuclear@0 1123
nuclear@0 1124 if (end_info_ptr != NULL)
nuclear@0 1125 {
nuclear@0 1126 #if defined(PNG_READ_TEXT_SUPPORTED)
nuclear@0 1127 png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
nuclear@0 1128 #endif
nuclear@0 1129 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1130 png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn,
nuclear@0 1131 (png_voidp)mem_ptr);
nuclear@0 1132 #else
nuclear@0 1133 png_destroy_struct((png_voidp)end_info_ptr);
nuclear@0 1134 #endif
nuclear@0 1135 *end_info_ptr_ptr = NULL;
nuclear@0 1136 }
nuclear@0 1137
nuclear@0 1138 if (png_ptr != NULL)
nuclear@0 1139 {
nuclear@0 1140 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1141 png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
nuclear@0 1142 (png_voidp)mem_ptr);
nuclear@0 1143 #else
nuclear@0 1144 png_destroy_struct((png_voidp)png_ptr);
nuclear@0 1145 #endif
nuclear@0 1146 *png_ptr_ptr = NULL;
nuclear@0 1147 }
nuclear@0 1148 }
nuclear@0 1149
nuclear@0 1150 /* free all memory used by the read (old method) */
nuclear@0 1151 void /* PRIVATE */
nuclear@0 1152 png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
nuclear@0 1153 {
nuclear@0 1154 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 1155 jmp_buf tmp_jmp;
nuclear@0 1156 #endif
nuclear@0 1157 png_error_ptr error_fn;
nuclear@0 1158 png_error_ptr warning_fn;
nuclear@0 1159 png_voidp error_ptr;
nuclear@0 1160 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1161 png_free_ptr free_fn;
nuclear@0 1162 #endif
nuclear@0 1163
nuclear@0 1164 png_debug(1, "in png_read_destroy\n");
nuclear@0 1165 if (info_ptr != NULL)
nuclear@0 1166 png_info_destroy(png_ptr, info_ptr);
nuclear@0 1167
nuclear@0 1168 if (end_info_ptr != NULL)
nuclear@0 1169 png_info_destroy(png_ptr, end_info_ptr);
nuclear@0 1170
nuclear@0 1171 png_free(png_ptr, png_ptr->zbuf);
nuclear@0 1172 png_free(png_ptr, png_ptr->big_row_buf);
nuclear@0 1173 png_free(png_ptr, png_ptr->prev_row);
nuclear@0 1174 png_free(png_ptr, png_ptr->chunkdata);
nuclear@0 1175 #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@0 1176 png_free(png_ptr, png_ptr->palette_lookup);
nuclear@0 1177 png_free(png_ptr, png_ptr->dither_index);
nuclear@0 1178 #endif
nuclear@0 1179 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@0 1180 png_free(png_ptr, png_ptr->gamma_table);
nuclear@0 1181 #endif
nuclear@0 1182 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@0 1183 png_free(png_ptr, png_ptr->gamma_from_1);
nuclear@0 1184 png_free(png_ptr, png_ptr->gamma_to_1);
nuclear@0 1185 #endif
nuclear@0 1186 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@0 1187 if (png_ptr->free_me & PNG_FREE_PLTE)
nuclear@0 1188 png_zfree(png_ptr, png_ptr->palette);
nuclear@0 1189 png_ptr->free_me &= ~PNG_FREE_PLTE;
nuclear@0 1190 #else
nuclear@0 1191 if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
nuclear@0 1192 png_zfree(png_ptr, png_ptr->palette);
nuclear@0 1193 png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
nuclear@0 1194 #endif
nuclear@0 1195 #if defined(PNG_tRNS_SUPPORTED) || \
nuclear@0 1196 defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@0 1197 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@0 1198 if (png_ptr->free_me & PNG_FREE_TRNS)
nuclear@0 1199 png_free(png_ptr, png_ptr->trans);
nuclear@0 1200 png_ptr->free_me &= ~PNG_FREE_TRNS;
nuclear@0 1201 #else
nuclear@0 1202 if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
nuclear@0 1203 png_free(png_ptr, png_ptr->trans);
nuclear@0 1204 png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
nuclear@0 1205 #endif
nuclear@0 1206 #endif
nuclear@0 1207 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@0 1208 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@0 1209 if (png_ptr->free_me & PNG_FREE_HIST)
nuclear@0 1210 png_free(png_ptr, png_ptr->hist);
nuclear@0 1211 png_ptr->free_me &= ~PNG_FREE_HIST;
nuclear@0 1212 #else
nuclear@0 1213 if (png_ptr->flags & PNG_FLAG_FREE_HIST)
nuclear@0 1214 png_free(png_ptr, png_ptr->hist);
nuclear@0 1215 png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
nuclear@0 1216 #endif
nuclear@0 1217 #endif
nuclear@0 1218 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@0 1219 if (png_ptr->gamma_16_table != NULL)
nuclear@0 1220 {
nuclear@0 1221 int i;
nuclear@0 1222 int istop = (1 << (8 - png_ptr->gamma_shift));
nuclear@0 1223 for (i = 0; i < istop; i++)
nuclear@0 1224 {
nuclear@0 1225 png_free(png_ptr, png_ptr->gamma_16_table[i]);
nuclear@0 1226 }
nuclear@0 1227 png_free(png_ptr, png_ptr->gamma_16_table);
nuclear@0 1228 }
nuclear@0 1229 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@0 1230 if (png_ptr->gamma_16_from_1 != NULL)
nuclear@0 1231 {
nuclear@0 1232 int i;
nuclear@0 1233 int istop = (1 << (8 - png_ptr->gamma_shift));
nuclear@0 1234 for (i = 0; i < istop; i++)
nuclear@0 1235 {
nuclear@0 1236 png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
nuclear@0 1237 }
nuclear@0 1238 png_free(png_ptr, png_ptr->gamma_16_from_1);
nuclear@0 1239 }
nuclear@0 1240 if (png_ptr->gamma_16_to_1 != NULL)
nuclear@0 1241 {
nuclear@0 1242 int i;
nuclear@0 1243 int istop = (1 << (8 - png_ptr->gamma_shift));
nuclear@0 1244 for (i = 0; i < istop; i++)
nuclear@0 1245 {
nuclear@0 1246 png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
nuclear@0 1247 }
nuclear@0 1248 png_free(png_ptr, png_ptr->gamma_16_to_1);
nuclear@0 1249 }
nuclear@0 1250 #endif
nuclear@0 1251 #endif
nuclear@0 1252 #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@0 1253 png_free(png_ptr, png_ptr->time_buffer);
nuclear@0 1254 #endif
nuclear@0 1255
nuclear@0 1256 inflateEnd(&png_ptr->zstream);
nuclear@0 1257 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@0 1258 png_free(png_ptr, png_ptr->save_buffer);
nuclear@0 1259 #endif
nuclear@0 1260
nuclear@0 1261 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@0 1262 #ifdef PNG_TEXT_SUPPORTED
nuclear@0 1263 png_free(png_ptr, png_ptr->current_text);
nuclear@0 1264 #endif /* PNG_TEXT_SUPPORTED */
nuclear@0 1265 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
nuclear@0 1266
nuclear@0 1267 /* Save the important info out of the png_struct, in case it is
nuclear@0 1268 * being used again.
nuclear@0 1269 */
nuclear@0 1270 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 1271 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@0 1272 #endif
nuclear@0 1273
nuclear@0 1274 error_fn = png_ptr->error_fn;
nuclear@0 1275 warning_fn = png_ptr->warning_fn;
nuclear@0 1276 error_ptr = png_ptr->error_ptr;
nuclear@0 1277 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1278 free_fn = png_ptr->free_fn;
nuclear@0 1279 #endif
nuclear@0 1280
nuclear@0 1281 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@0 1282
nuclear@0 1283 png_ptr->error_fn = error_fn;
nuclear@0 1284 png_ptr->warning_fn = warning_fn;
nuclear@0 1285 png_ptr->error_ptr = error_ptr;
nuclear@0 1286 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1287 png_ptr->free_fn = free_fn;
nuclear@0 1288 #endif
nuclear@0 1289
nuclear@0 1290 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 1291 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@0 1292 #endif
nuclear@0 1293
nuclear@0 1294 }
nuclear@0 1295
nuclear@0 1296 void PNGAPI
nuclear@0 1297 png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
nuclear@0 1298 {
nuclear@0 1299 if (png_ptr == NULL) return;
nuclear@0 1300 png_ptr->read_row_fn = read_row_fn;
nuclear@0 1301 }
nuclear@0 1302
nuclear@0 1303
nuclear@0 1304 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@0 1305 #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@0 1306 void PNGAPI
nuclear@0 1307 png_read_png(png_structp png_ptr, png_infop info_ptr,
nuclear@0 1308 int transforms,
nuclear@0 1309 voidp params)
nuclear@0 1310 {
nuclear@0 1311 int row;
nuclear@0 1312
nuclear@0 1313 if (png_ptr == NULL) return;
nuclear@0 1314 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
nuclear@0 1315 /* invert the alpha channel from opacity to transparency
nuclear@0 1316 */
nuclear@0 1317 if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
nuclear@0 1318 png_set_invert_alpha(png_ptr);
nuclear@0 1319 #endif
nuclear@0 1320
nuclear@0 1321 /* png_read_info() gives us all of the information from the
nuclear@0 1322 * PNG file before the first IDAT (image data chunk).
nuclear@0 1323 */
nuclear@0 1324 png_read_info(png_ptr, info_ptr);
nuclear@0 1325 if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
nuclear@0 1326 png_error(png_ptr, "Image is too high to process with png_read_png()");
nuclear@0 1327
nuclear@0 1328 /* -------------- image transformations start here ------------------- */
nuclear@0 1329
nuclear@0 1330 #if defined(PNG_READ_16_TO_8_SUPPORTED)
nuclear@0 1331 /* tell libpng to strip 16 bit/color files down to 8 bits per color
nuclear@0 1332 */
nuclear@0 1333 if (transforms & PNG_TRANSFORM_STRIP_16)
nuclear@0 1334 png_set_strip_16(png_ptr);
nuclear@0 1335 #endif
nuclear@0 1336
nuclear@0 1337 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
nuclear@0 1338 /* Strip alpha bytes from the input data without combining with
nuclear@0 1339 * the background (not recommended).
nuclear@0 1340 */
nuclear@0 1341 if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
nuclear@0 1342 png_set_strip_alpha(png_ptr);
nuclear@0 1343 #endif
nuclear@0 1344
nuclear@0 1345 #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@0 1346 /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single
nuclear@0 1347 * byte into separate bytes (useful for paletted and grayscale images).
nuclear@0 1348 */
nuclear@0 1349 if (transforms & PNG_TRANSFORM_PACKING)
nuclear@0 1350 png_set_packing(png_ptr);
nuclear@0 1351 #endif
nuclear@0 1352
nuclear@0 1353 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@0 1354 /* Change the order of packed pixels to least significant bit first
nuclear@0 1355 * (not useful if you are using png_set_packing).
nuclear@0 1356 */
nuclear@0 1357 if (transforms & PNG_TRANSFORM_PACKSWAP)
nuclear@0 1358 png_set_packswap(png_ptr);
nuclear@0 1359 #endif
nuclear@0 1360
nuclear@0 1361 #if defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@0 1362 /* Expand paletted colors into true RGB triplets
nuclear@0 1363 * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
nuclear@0 1364 * Expand paletted or RGB images with transparency to full alpha
nuclear@0 1365 * channels so the data will be available as RGBA quartets.
nuclear@0 1366 */
nuclear@0 1367 if (transforms & PNG_TRANSFORM_EXPAND)
nuclear@0 1368 if ((png_ptr->bit_depth < 8) ||
nuclear@0 1369 (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
nuclear@0 1370 (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
nuclear@0 1371 png_set_expand(png_ptr);
nuclear@0 1372 #endif
nuclear@0 1373
nuclear@0 1374 /* We don't handle background color or gamma transformation or dithering.
nuclear@0 1375 */
nuclear@0 1376
nuclear@0 1377 #if defined(PNG_READ_INVERT_SUPPORTED)
nuclear@0 1378 /* invert monochrome files to have 0 as white and 1 as black
nuclear@0 1379 */
nuclear@0 1380 if (transforms & PNG_TRANSFORM_INVERT_MONO)
nuclear@0 1381 png_set_invert_mono(png_ptr);
nuclear@0 1382 #endif
nuclear@0 1383
nuclear@0 1384 #if defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@0 1385 /* If you want to shift the pixel values from the range [0,255] or
nuclear@0 1386 * [0,65535] to the original [0,7] or [0,31], or whatever range the
nuclear@0 1387 * colors were originally in:
nuclear@0 1388 */
nuclear@0 1389 if ((transforms & PNG_TRANSFORM_SHIFT)
nuclear@0 1390 && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
nuclear@0 1391 {
nuclear@0 1392 png_color_8p sig_bit;
nuclear@0 1393
nuclear@0 1394 png_get_sBIT(png_ptr, info_ptr, &sig_bit);
nuclear@0 1395 png_set_shift(png_ptr, sig_bit);
nuclear@0 1396 }
nuclear@0 1397 #endif
nuclear@0 1398
nuclear@0 1399 #if defined(PNG_READ_BGR_SUPPORTED)
nuclear@0 1400 /* flip the RGB pixels to BGR (or RGBA to BGRA)
nuclear@0 1401 */
nuclear@0 1402 if (transforms & PNG_TRANSFORM_BGR)
nuclear@0 1403 png_set_bgr(png_ptr);
nuclear@0 1404 #endif
nuclear@0 1405
nuclear@0 1406 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
nuclear@0 1407 /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
nuclear@0 1408 */
nuclear@0 1409 if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
nuclear@0 1410 png_set_swap_alpha(png_ptr);
nuclear@0 1411 #endif
nuclear@0 1412
nuclear@0 1413 #if defined(PNG_READ_SWAP_SUPPORTED)
nuclear@0 1414 /* swap bytes of 16 bit files to least significant byte first
nuclear@0 1415 */
nuclear@0 1416 if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
nuclear@0 1417 png_set_swap(png_ptr);
nuclear@0 1418 #endif
nuclear@0 1419
nuclear@0 1420 /* We don't handle adding filler bytes */
nuclear@0 1421
nuclear@0 1422 /* Optional call to gamma correct and add the background to the palette
nuclear@0 1423 * and update info structure. REQUIRED if you are expecting libpng to
nuclear@0 1424 * update the palette for you (i.e., you selected such a transform above).
nuclear@0 1425 */
nuclear@0 1426 png_read_update_info(png_ptr, info_ptr);
nuclear@0 1427
nuclear@0 1428 /* -------------- image transformations end here ------------------- */
nuclear@0 1429
nuclear@0 1430 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@0 1431 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
nuclear@0 1432 #endif
nuclear@0 1433 if (info_ptr->row_pointers == NULL)
nuclear@0 1434 {
nuclear@0 1435 info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
nuclear@0 1436 info_ptr->height * png_sizeof(png_bytep));
nuclear@0 1437 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@0 1438 info_ptr->free_me |= PNG_FREE_ROWS;
nuclear@0 1439 #endif
nuclear@0 1440 for (row = 0; row < (int)info_ptr->height; row++)
nuclear@0 1441 {
nuclear@0 1442 info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
nuclear@0 1443 png_get_rowbytes(png_ptr, info_ptr));
nuclear@0 1444 }
nuclear@0 1445 }
nuclear@0 1446
nuclear@0 1447 png_read_image(png_ptr, info_ptr->row_pointers);
nuclear@0 1448 info_ptr->valid |= PNG_INFO_IDAT;
nuclear@0 1449
nuclear@0 1450 /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
nuclear@0 1451 png_read_end(png_ptr, info_ptr);
nuclear@0 1452
nuclear@0 1453 transforms = transforms; /* quiet compiler warnings */
nuclear@0 1454 params = params;
nuclear@0 1455
nuclear@0 1456 }
nuclear@0 1457 #endif /* PNG_INFO_IMAGE_SUPPORTED */
nuclear@0 1458 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@0 1459 #endif /* PNG_READ_SUPPORTED */