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

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added libimago, libjpeg and libpng
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 07 Jun 2015 17:25:49 +0300
parents
children
rev   line source
nuclear@14 1
nuclear@14 2 /* pngread.c - read a PNG file
nuclear@14 3 *
nuclear@14 4 * Last changed in libpng 1.2.30 [August 15, 2008]
nuclear@14 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@14 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@14 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@14 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@14 9 *
nuclear@14 10 * This file contains routines that an application calls directly to
nuclear@14 11 * read a PNG file or stream.
nuclear@14 12 */
nuclear@14 13
nuclear@14 14 #define PNG_INTERNAL
nuclear@14 15 #include "png.h"
nuclear@14 16 #if defined(PNG_READ_SUPPORTED)
nuclear@14 17
nuclear@14 18 /* Create a PNG structure for reading, and allocate any memory needed. */
nuclear@14 19 png_structp PNGAPI
nuclear@14 20 png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@14 21 png_error_ptr error_fn, png_error_ptr warn_fn)
nuclear@14 22 {
nuclear@14 23
nuclear@14 24 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 25 return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
nuclear@14 26 warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
nuclear@14 27 }
nuclear@14 28
nuclear@14 29 /* Alternate create PNG structure for reading, and allocate any memory needed. */
nuclear@14 30 png_structp PNGAPI
nuclear@14 31 png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@14 32 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@14 33 png_malloc_ptr malloc_fn, png_free_ptr free_fn)
nuclear@14 34 {
nuclear@14 35 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14 36
nuclear@14 37 #ifdef PNG_SETJMP_SUPPORTED
nuclear@14 38 volatile
nuclear@14 39 #endif
nuclear@14 40 png_structp png_ptr;
nuclear@14 41
nuclear@14 42 #ifdef PNG_SETJMP_SUPPORTED
nuclear@14 43 #ifdef USE_FAR_KEYWORD
nuclear@14 44 jmp_buf jmpbuf;
nuclear@14 45 #endif
nuclear@14 46 #endif
nuclear@14 47
nuclear@14 48 int i;
nuclear@14 49
nuclear@14 50 png_debug(1, "in png_create_read_struct\n");
nuclear@14 51 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 52 png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
nuclear@14 53 (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
nuclear@14 54 #else
nuclear@14 55 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@14 56 #endif
nuclear@14 57 if (png_ptr == NULL)
nuclear@14 58 return (NULL);
nuclear@14 59
nuclear@14 60 /* added at libpng-1.2.6 */
nuclear@14 61 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@14 62 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@14 63 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@14 64 #endif
nuclear@14 65
nuclear@14 66 #ifdef PNG_SETJMP_SUPPORTED
nuclear@14 67 #ifdef USE_FAR_KEYWORD
nuclear@14 68 if (setjmp(jmpbuf))
nuclear@14 69 #else
nuclear@14 70 if (setjmp(png_ptr->jmpbuf))
nuclear@14 71 #endif
nuclear@14 72 {
nuclear@14 73 png_free(png_ptr, png_ptr->zbuf);
nuclear@14 74 png_ptr->zbuf = NULL;
nuclear@14 75 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 76 png_destroy_struct_2((png_voidp)png_ptr,
nuclear@14 77 (png_free_ptr)free_fn, (png_voidp)mem_ptr);
nuclear@14 78 #else
nuclear@14 79 png_destroy_struct((png_voidp)png_ptr);
nuclear@14 80 #endif
nuclear@14 81 return (NULL);
nuclear@14 82 }
nuclear@14 83 #ifdef USE_FAR_KEYWORD
nuclear@14 84 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@14 85 #endif
nuclear@14 86 #endif
nuclear@14 87
nuclear@14 88 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 89 png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
nuclear@14 90 #endif
nuclear@14 91
nuclear@14 92 png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
nuclear@14 93
nuclear@14 94 if (user_png_ver)
nuclear@14 95 {
nuclear@14 96 i = 0;
nuclear@14 97 do
nuclear@14 98 {
nuclear@14 99 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@14 100 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@14 101 } while (png_libpng_ver[i++]);
nuclear@14 102 }
nuclear@14 103 else
nuclear@14 104 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@14 105
nuclear@14 106
nuclear@14 107 if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
nuclear@14 108 {
nuclear@14 109 /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
nuclear@14 110 * we must recompile any applications that use any older library version.
nuclear@14 111 * For versions after libpng 1.0, we will be compatible, so we need
nuclear@14 112 * only check the first digit.
nuclear@14 113 */
nuclear@14 114 if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
nuclear@14 115 (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
nuclear@14 116 (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
nuclear@14 117 {
nuclear@14 118 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@14 119 char msg[80];
nuclear@14 120 if (user_png_ver)
nuclear@14 121 {
nuclear@14 122 png_snprintf(msg, 80,
nuclear@14 123 "Application was compiled with png.h from libpng-%.20s",
nuclear@14 124 user_png_ver);
nuclear@14 125 png_warning(png_ptr, msg);
nuclear@14 126 }
nuclear@14 127 png_snprintf(msg, 80,
nuclear@14 128 "Application is running with png.c from libpng-%.20s",
nuclear@14 129 png_libpng_ver);
nuclear@14 130 png_warning(png_ptr, msg);
nuclear@14 131 #endif
nuclear@14 132 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@14 133 png_ptr->flags = 0;
nuclear@14 134 #endif
nuclear@14 135 png_error(png_ptr,
nuclear@14 136 "Incompatible libpng version in application and library");
nuclear@14 137 }
nuclear@14 138 }
nuclear@14 139
nuclear@14 140 /* initialize zbuf - compression buffer */
nuclear@14 141 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@14 142 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@14 143 (png_uint_32)png_ptr->zbuf_size);
nuclear@14 144 png_ptr->zstream.zalloc = png_zalloc;
nuclear@14 145 png_ptr->zstream.zfree = png_zfree;
nuclear@14 146 png_ptr->zstream.opaque = (voidpf)png_ptr;
nuclear@14 147
nuclear@14 148 switch (inflateInit(&png_ptr->zstream))
nuclear@14 149 {
nuclear@14 150 case Z_OK: /* Do nothing */ break;
nuclear@14 151 case Z_MEM_ERROR:
nuclear@14 152 case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;
nuclear@14 153 case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break;
nuclear@14 154 default: png_error(png_ptr, "Unknown zlib error");
nuclear@14 155 }
nuclear@14 156
nuclear@14 157 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@14 158 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@14 159
nuclear@14 160 png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
nuclear@14 161
nuclear@14 162 #ifdef PNG_SETJMP_SUPPORTED
nuclear@14 163 /* Applications that neglect to set up their own setjmp() and then encounter
nuclear@14 164 a png_error() will longjmp here. Since the jmpbuf is then meaningless we
nuclear@14 165 abort instead of returning. */
nuclear@14 166 #ifdef USE_FAR_KEYWORD
nuclear@14 167 if (setjmp(jmpbuf))
nuclear@14 168 PNG_ABORT();
nuclear@14 169 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@14 170 #else
nuclear@14 171 if (setjmp(png_ptr->jmpbuf))
nuclear@14 172 PNG_ABORT();
nuclear@14 173 #endif
nuclear@14 174 #endif
nuclear@14 175 return (png_ptr);
nuclear@14 176 }
nuclear@14 177
nuclear@14 178 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
nuclear@14 179 /* Initialize PNG structure for reading, and allocate any memory needed.
nuclear@14 180 This interface is deprecated in favour of the png_create_read_struct(),
nuclear@14 181 and it will disappear as of libpng-1.3.0. */
nuclear@14 182 #undef png_read_init
nuclear@14 183 void PNGAPI
nuclear@14 184 png_read_init(png_structp png_ptr)
nuclear@14 185 {
nuclear@14 186 /* We only come here via pre-1.0.7-compiled applications */
nuclear@14 187 png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
nuclear@14 188 }
nuclear@14 189
nuclear@14 190 void PNGAPI
nuclear@14 191 png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
nuclear@14 192 png_size_t png_struct_size, png_size_t png_info_size)
nuclear@14 193 {
nuclear@14 194 /* We only come here via pre-1.0.12-compiled applications */
nuclear@14 195 if (png_ptr == NULL) return;
nuclear@14 196 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@14 197 if (png_sizeof(png_struct) > png_struct_size ||
nuclear@14 198 png_sizeof(png_info) > png_info_size)
nuclear@14 199 {
nuclear@14 200 char msg[80];
nuclear@14 201 png_ptr->warning_fn = NULL;
nuclear@14 202 if (user_png_ver)
nuclear@14 203 {
nuclear@14 204 png_snprintf(msg, 80,
nuclear@14 205 "Application was compiled with png.h from libpng-%.20s",
nuclear@14 206 user_png_ver);
nuclear@14 207 png_warning(png_ptr, msg);
nuclear@14 208 }
nuclear@14 209 png_snprintf(msg, 80,
nuclear@14 210 "Application is running with png.c from libpng-%.20s",
nuclear@14 211 png_libpng_ver);
nuclear@14 212 png_warning(png_ptr, msg);
nuclear@14 213 }
nuclear@14 214 #endif
nuclear@14 215 if (png_sizeof(png_struct) > png_struct_size)
nuclear@14 216 {
nuclear@14 217 png_ptr->error_fn = NULL;
nuclear@14 218 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@14 219 png_ptr->flags = 0;
nuclear@14 220 #endif
nuclear@14 221 png_error(png_ptr,
nuclear@14 222 "The png struct allocated by the application for reading is too small.");
nuclear@14 223 }
nuclear@14 224 if (png_sizeof(png_info) > png_info_size)
nuclear@14 225 {
nuclear@14 226 png_ptr->error_fn = NULL;
nuclear@14 227 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@14 228 png_ptr->flags = 0;
nuclear@14 229 #endif
nuclear@14 230 png_error(png_ptr,
nuclear@14 231 "The info struct allocated by application for reading is too small.");
nuclear@14 232 }
nuclear@14 233 png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
nuclear@14 234 }
nuclear@14 235 #endif /* PNG_1_0_X || PNG_1_2_X */
nuclear@14 236
nuclear@14 237 void PNGAPI
nuclear@14 238 png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
nuclear@14 239 png_size_t png_struct_size)
nuclear@14 240 {
nuclear@14 241 #ifdef PNG_SETJMP_SUPPORTED
nuclear@14 242 jmp_buf tmp_jmp; /* to save current jump buffer */
nuclear@14 243 #endif
nuclear@14 244
nuclear@14 245 int i = 0;
nuclear@14 246
nuclear@14 247 png_structp png_ptr=*ptr_ptr;
nuclear@14 248
nuclear@14 249 if (png_ptr == NULL) return;
nuclear@14 250
nuclear@14 251 do
nuclear@14 252 {
nuclear@14 253 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@14 254 {
nuclear@14 255 #ifdef PNG_LEGACY_SUPPORTED
nuclear@14 256 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@14 257 #else
nuclear@14 258 png_ptr->warning_fn = NULL;
nuclear@14 259 png_warning(png_ptr,
nuclear@14 260 "Application uses deprecated png_read_init() and should be recompiled.");
nuclear@14 261 break;
nuclear@14 262 #endif
nuclear@14 263 }
nuclear@14 264 } while (png_libpng_ver[i++]);
nuclear@14 265
nuclear@14 266 png_debug(1, "in png_read_init_3\n");
nuclear@14 267
nuclear@14 268 #ifdef PNG_SETJMP_SUPPORTED
nuclear@14 269 /* save jump buffer and error functions */
nuclear@14 270 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@14 271 #endif
nuclear@14 272
nuclear@14 273 if (png_sizeof(png_struct) > png_struct_size)
nuclear@14 274 {
nuclear@14 275 png_destroy_struct(png_ptr);
nuclear@14 276 *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@14 277 png_ptr = *ptr_ptr;
nuclear@14 278 }
nuclear@14 279
nuclear@14 280 /* reset all variables to 0 */
nuclear@14 281 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@14 282
nuclear@14 283 #ifdef PNG_SETJMP_SUPPORTED
nuclear@14 284 /* restore jump buffer */
nuclear@14 285 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@14 286 #endif
nuclear@14 287
nuclear@14 288 /* added at libpng-1.2.6 */
nuclear@14 289 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@14 290 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@14 291 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@14 292 #endif
nuclear@14 293
nuclear@14 294 /* initialize zbuf - compression buffer */
nuclear@14 295 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@14 296 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@14 297 (png_uint_32)png_ptr->zbuf_size);
nuclear@14 298 png_ptr->zstream.zalloc = png_zalloc;
nuclear@14 299 png_ptr->zstream.zfree = png_zfree;
nuclear@14 300 png_ptr->zstream.opaque = (voidpf)png_ptr;
nuclear@14 301
nuclear@14 302 switch (inflateInit(&png_ptr->zstream))
nuclear@14 303 {
nuclear@14 304 case Z_OK: /* Do nothing */ break;
nuclear@14 305 case Z_MEM_ERROR:
nuclear@14 306 case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break;
nuclear@14 307 case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break;
nuclear@14 308 default: png_error(png_ptr, "Unknown zlib error");
nuclear@14 309 }
nuclear@14 310
nuclear@14 311 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@14 312 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@14 313
nuclear@14 314 png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
nuclear@14 315 }
nuclear@14 316
nuclear@14 317 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@14 318 /* Read the information before the actual image data. This has been
nuclear@14 319 * changed in v0.90 to allow reading a file that already has the magic
nuclear@14 320 * bytes read from the stream. You can tell libpng how many bytes have
nuclear@14 321 * been read from the beginning of the stream (up to the maximum of 8)
nuclear@14 322 * via png_set_sig_bytes(), and we will only check the remaining bytes
nuclear@14 323 * here. The application can then have access to the signature bytes we
nuclear@14 324 * read if it is determined that this isn't a valid PNG file.
nuclear@14 325 */
nuclear@14 326 void PNGAPI
nuclear@14 327 png_read_info(png_structp png_ptr, png_infop info_ptr)
nuclear@14 328 {
nuclear@14 329 if (png_ptr == NULL || info_ptr == NULL) return;
nuclear@14 330 png_debug(1, "in png_read_info\n");
nuclear@14 331 /* If we haven't checked all of the PNG signature bytes, do so now. */
nuclear@14 332 if (png_ptr->sig_bytes < 8)
nuclear@14 333 {
nuclear@14 334 png_size_t num_checked = png_ptr->sig_bytes,
nuclear@14 335 num_to_check = 8 - num_checked;
nuclear@14 336
nuclear@14 337 png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
nuclear@14 338 png_ptr->sig_bytes = 8;
nuclear@14 339
nuclear@14 340 if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
nuclear@14 341 {
nuclear@14 342 if (num_checked < 4 &&
nuclear@14 343 png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
nuclear@14 344 png_error(png_ptr, "Not a PNG file");
nuclear@14 345 else
nuclear@14 346 png_error(png_ptr, "PNG file corrupted by ASCII conversion");
nuclear@14 347 }
nuclear@14 348 if (num_checked < 3)
nuclear@14 349 png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
nuclear@14 350 }
nuclear@14 351
nuclear@14 352 for (;;)
nuclear@14 353 {
nuclear@14 354 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@14 355 PNG_CONST PNG_IHDR;
nuclear@14 356 PNG_CONST PNG_IDAT;
nuclear@14 357 PNG_CONST PNG_IEND;
nuclear@14 358 PNG_CONST PNG_PLTE;
nuclear@14 359 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@14 360 PNG_CONST PNG_bKGD;
nuclear@14 361 #endif
nuclear@14 362 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@14 363 PNG_CONST PNG_cHRM;
nuclear@14 364 #endif
nuclear@14 365 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@14 366 PNG_CONST PNG_gAMA;
nuclear@14 367 #endif
nuclear@14 368 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@14 369 PNG_CONST PNG_hIST;
nuclear@14 370 #endif
nuclear@14 371 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@14 372 PNG_CONST PNG_iCCP;
nuclear@14 373 #endif
nuclear@14 374 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@14 375 PNG_CONST PNG_iTXt;
nuclear@14 376 #endif
nuclear@14 377 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@14 378 PNG_CONST PNG_oFFs;
nuclear@14 379 #endif
nuclear@14 380 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@14 381 PNG_CONST PNG_pCAL;
nuclear@14 382 #endif
nuclear@14 383 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@14 384 PNG_CONST PNG_pHYs;
nuclear@14 385 #endif
nuclear@14 386 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@14 387 PNG_CONST PNG_sBIT;
nuclear@14 388 #endif
nuclear@14 389 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@14 390 PNG_CONST PNG_sCAL;
nuclear@14 391 #endif
nuclear@14 392 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@14 393 PNG_CONST PNG_sPLT;
nuclear@14 394 #endif
nuclear@14 395 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@14 396 PNG_CONST PNG_sRGB;
nuclear@14 397 #endif
nuclear@14 398 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@14 399 PNG_CONST PNG_tEXt;
nuclear@14 400 #endif
nuclear@14 401 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@14 402 PNG_CONST PNG_tIME;
nuclear@14 403 #endif
nuclear@14 404 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@14 405 PNG_CONST PNG_tRNS;
nuclear@14 406 #endif
nuclear@14 407 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@14 408 PNG_CONST PNG_zTXt;
nuclear@14 409 #endif
nuclear@14 410 #endif /* PNG_USE_LOCAL_ARRAYS */
nuclear@14 411 png_uint_32 length = png_read_chunk_header(png_ptr);
nuclear@14 412 PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
nuclear@14 413
nuclear@14 414 /* This should be a binary subdivision search or a hash for
nuclear@14 415 * matching the chunk name rather than a linear search.
nuclear@14 416 */
nuclear@14 417 if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@14 418 if (png_ptr->mode & PNG_AFTER_IDAT)
nuclear@14 419 png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
nuclear@14 420
nuclear@14 421 if (!png_memcmp(chunk_name, png_IHDR, 4))
nuclear@14 422 png_handle_IHDR(png_ptr, info_ptr, length);
nuclear@14 423 else if (!png_memcmp(chunk_name, png_IEND, 4))
nuclear@14 424 png_handle_IEND(png_ptr, info_ptr, length);
nuclear@14 425 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@14 426 else if (png_handle_as_unknown(png_ptr, chunk_name))
nuclear@14 427 {
nuclear@14 428 if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@14 429 png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@14 430 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@14 431 if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@14 432 png_ptr->mode |= PNG_HAVE_PLTE;
nuclear@14 433 else if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@14 434 {
nuclear@14 435 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@14 436 png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@14 437 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@14 438 !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@14 439 png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@14 440 break;
nuclear@14 441 }
nuclear@14 442 }
nuclear@14 443 #endif
nuclear@14 444 else if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@14 445 png_handle_PLTE(png_ptr, info_ptr, length);
nuclear@14 446 else if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@14 447 {
nuclear@14 448 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@14 449 png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@14 450 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@14 451 !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@14 452 png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@14 453
nuclear@14 454 png_ptr->idat_size = length;
nuclear@14 455 png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@14 456 break;
nuclear@14 457 }
nuclear@14 458 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@14 459 else if (!png_memcmp(chunk_name, png_bKGD, 4))
nuclear@14 460 png_handle_bKGD(png_ptr, info_ptr, length);
nuclear@14 461 #endif
nuclear@14 462 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@14 463 else if (!png_memcmp(chunk_name, png_cHRM, 4))
nuclear@14 464 png_handle_cHRM(png_ptr, info_ptr, length);
nuclear@14 465 #endif
nuclear@14 466 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@14 467 else if (!png_memcmp(chunk_name, png_gAMA, 4))
nuclear@14 468 png_handle_gAMA(png_ptr, info_ptr, length);
nuclear@14 469 #endif
nuclear@14 470 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@14 471 else if (!png_memcmp(chunk_name, png_hIST, 4))
nuclear@14 472 png_handle_hIST(png_ptr, info_ptr, length);
nuclear@14 473 #endif
nuclear@14 474 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@14 475 else if (!png_memcmp(chunk_name, png_oFFs, 4))
nuclear@14 476 png_handle_oFFs(png_ptr, info_ptr, length);
nuclear@14 477 #endif
nuclear@14 478 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@14 479 else if (!png_memcmp(chunk_name, png_pCAL, 4))
nuclear@14 480 png_handle_pCAL(png_ptr, info_ptr, length);
nuclear@14 481 #endif
nuclear@14 482 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@14 483 else if (!png_memcmp(chunk_name, png_sCAL, 4))
nuclear@14 484 png_handle_sCAL(png_ptr, info_ptr, length);
nuclear@14 485 #endif
nuclear@14 486 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@14 487 else if (!png_memcmp(chunk_name, png_pHYs, 4))
nuclear@14 488 png_handle_pHYs(png_ptr, info_ptr, length);
nuclear@14 489 #endif
nuclear@14 490 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@14 491 else if (!png_memcmp(chunk_name, png_sBIT, 4))
nuclear@14 492 png_handle_sBIT(png_ptr, info_ptr, length);
nuclear@14 493 #endif
nuclear@14 494 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@14 495 else if (!png_memcmp(chunk_name, png_sRGB, 4))
nuclear@14 496 png_handle_sRGB(png_ptr, info_ptr, length);
nuclear@14 497 #endif
nuclear@14 498 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@14 499 else if (!png_memcmp(chunk_name, png_iCCP, 4))
nuclear@14 500 png_handle_iCCP(png_ptr, info_ptr, length);
nuclear@14 501 #endif
nuclear@14 502 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@14 503 else if (!png_memcmp(chunk_name, png_sPLT, 4))
nuclear@14 504 png_handle_sPLT(png_ptr, info_ptr, length);
nuclear@14 505 #endif
nuclear@14 506 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@14 507 else if (!png_memcmp(chunk_name, png_tEXt, 4))
nuclear@14 508 png_handle_tEXt(png_ptr, info_ptr, length);
nuclear@14 509 #endif
nuclear@14 510 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@14 511 else if (!png_memcmp(chunk_name, png_tIME, 4))
nuclear@14 512 png_handle_tIME(png_ptr, info_ptr, length);
nuclear@14 513 #endif
nuclear@14 514 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@14 515 else if (!png_memcmp(chunk_name, png_tRNS, 4))
nuclear@14 516 png_handle_tRNS(png_ptr, info_ptr, length);
nuclear@14 517 #endif
nuclear@14 518 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@14 519 else if (!png_memcmp(chunk_name, png_zTXt, 4))
nuclear@14 520 png_handle_zTXt(png_ptr, info_ptr, length);
nuclear@14 521 #endif
nuclear@14 522 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@14 523 else if (!png_memcmp(chunk_name, png_iTXt, 4))
nuclear@14 524 png_handle_iTXt(png_ptr, info_ptr, length);
nuclear@14 525 #endif
nuclear@14 526 else
nuclear@14 527 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@14 528 }
nuclear@14 529 }
nuclear@14 530 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@14 531
nuclear@14 532 /* optional call to update the users info_ptr structure */
nuclear@14 533 void PNGAPI
nuclear@14 534 png_read_update_info(png_structp png_ptr, png_infop info_ptr)
nuclear@14 535 {
nuclear@14 536 png_debug(1, "in png_read_update_info\n");
nuclear@14 537 if (png_ptr == NULL) return;
nuclear@14 538 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
nuclear@14 539 png_read_start_row(png_ptr);
nuclear@14 540 else
nuclear@14 541 png_warning(png_ptr,
nuclear@14 542 "Ignoring extra png_read_update_info() call; row buffer not reallocated");
nuclear@14 543 png_read_transform_info(png_ptr, info_ptr);
nuclear@14 544 }
nuclear@14 545
nuclear@14 546 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@14 547 /* Initialize palette, background, etc, after transformations
nuclear@14 548 * are set, but before any reading takes place. This allows
nuclear@14 549 * the user to obtain a gamma-corrected palette, for example.
nuclear@14 550 * If the user doesn't call this, we will do it ourselves.
nuclear@14 551 */
nuclear@14 552 void PNGAPI
nuclear@14 553 png_start_read_image(png_structp png_ptr)
nuclear@14 554 {
nuclear@14 555 png_debug(1, "in png_start_read_image\n");
nuclear@14 556 if (png_ptr == NULL) return;
nuclear@14 557 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
nuclear@14 558 png_read_start_row(png_ptr);
nuclear@14 559 }
nuclear@14 560 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@14 561
nuclear@14 562 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@14 563 void PNGAPI
nuclear@14 564 png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
nuclear@14 565 {
nuclear@14 566 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@14 567 PNG_CONST PNG_IDAT;
nuclear@14 568 PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
nuclear@14 569 0xff};
nuclear@14 570 PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
nuclear@14 571 #endif
nuclear@14 572 int ret;
nuclear@14 573 if (png_ptr == NULL) return;
nuclear@14 574 png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
nuclear@14 575 png_ptr->row_number, png_ptr->pass);
nuclear@14 576 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
nuclear@14 577 png_read_start_row(png_ptr);
nuclear@14 578 if (png_ptr->row_number == 0 && png_ptr->pass == 0)
nuclear@14 579 {
nuclear@14 580 /* check for transforms that have been set but were defined out */
nuclear@14 581 #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
nuclear@14 582 if (png_ptr->transformations & PNG_INVERT_MONO)
nuclear@14 583 png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
nuclear@14 584 #endif
nuclear@14 585 #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
nuclear@14 586 if (png_ptr->transformations & PNG_FILLER)
nuclear@14 587 png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined.");
nuclear@14 588 #endif
nuclear@14 589 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@14 590 if (png_ptr->transformations & PNG_PACKSWAP)
nuclear@14 591 png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined.");
nuclear@14 592 #endif
nuclear@14 593 #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
nuclear@14 594 if (png_ptr->transformations & PNG_PACK)
nuclear@14 595 png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined.");
nuclear@14 596 #endif
nuclear@14 597 #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@14 598 if (png_ptr->transformations & PNG_SHIFT)
nuclear@14 599 png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined.");
nuclear@14 600 #endif
nuclear@14 601 #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
nuclear@14 602 if (png_ptr->transformations & PNG_BGR)
nuclear@14 603 png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined.");
nuclear@14 604 #endif
nuclear@14 605 #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
nuclear@14 606 if (png_ptr->transformations & PNG_SWAP_BYTES)
nuclear@14 607 png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined.");
nuclear@14 608 #endif
nuclear@14 609 }
nuclear@14 610
nuclear@14 611 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@14 612 /* if interlaced and we do not need a new row, combine row and return */
nuclear@14 613 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
nuclear@14 614 {
nuclear@14 615 switch (png_ptr->pass)
nuclear@14 616 {
nuclear@14 617 case 0:
nuclear@14 618 if (png_ptr->row_number & 0x07)
nuclear@14 619 {
nuclear@14 620 if (dsp_row != NULL)
nuclear@14 621 png_combine_row(png_ptr, dsp_row,
nuclear@14 622 png_pass_dsp_mask[png_ptr->pass]);
nuclear@14 623 png_read_finish_row(png_ptr);
nuclear@14 624 return;
nuclear@14 625 }
nuclear@14 626 break;
nuclear@14 627 case 1:
nuclear@14 628 if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
nuclear@14 629 {
nuclear@14 630 if (dsp_row != NULL)
nuclear@14 631 png_combine_row(png_ptr, dsp_row,
nuclear@14 632 png_pass_dsp_mask[png_ptr->pass]);
nuclear@14 633 png_read_finish_row(png_ptr);
nuclear@14 634 return;
nuclear@14 635 }
nuclear@14 636 break;
nuclear@14 637 case 2:
nuclear@14 638 if ((png_ptr->row_number & 0x07) != 4)
nuclear@14 639 {
nuclear@14 640 if (dsp_row != NULL && (png_ptr->row_number & 4))
nuclear@14 641 png_combine_row(png_ptr, dsp_row,
nuclear@14 642 png_pass_dsp_mask[png_ptr->pass]);
nuclear@14 643 png_read_finish_row(png_ptr);
nuclear@14 644 return;
nuclear@14 645 }
nuclear@14 646 break;
nuclear@14 647 case 3:
nuclear@14 648 if ((png_ptr->row_number & 3) || png_ptr->width < 3)
nuclear@14 649 {
nuclear@14 650 if (dsp_row != NULL)
nuclear@14 651 png_combine_row(png_ptr, dsp_row,
nuclear@14 652 png_pass_dsp_mask[png_ptr->pass]);
nuclear@14 653 png_read_finish_row(png_ptr);
nuclear@14 654 return;
nuclear@14 655 }
nuclear@14 656 break;
nuclear@14 657 case 4:
nuclear@14 658 if ((png_ptr->row_number & 3) != 2)
nuclear@14 659 {
nuclear@14 660 if (dsp_row != NULL && (png_ptr->row_number & 2))
nuclear@14 661 png_combine_row(png_ptr, dsp_row,
nuclear@14 662 png_pass_dsp_mask[png_ptr->pass]);
nuclear@14 663 png_read_finish_row(png_ptr);
nuclear@14 664 return;
nuclear@14 665 }
nuclear@14 666 break;
nuclear@14 667 case 5:
nuclear@14 668 if ((png_ptr->row_number & 1) || png_ptr->width < 2)
nuclear@14 669 {
nuclear@14 670 if (dsp_row != NULL)
nuclear@14 671 png_combine_row(png_ptr, dsp_row,
nuclear@14 672 png_pass_dsp_mask[png_ptr->pass]);
nuclear@14 673 png_read_finish_row(png_ptr);
nuclear@14 674 return;
nuclear@14 675 }
nuclear@14 676 break;
nuclear@14 677 case 6:
nuclear@14 678 if (!(png_ptr->row_number & 1))
nuclear@14 679 {
nuclear@14 680 png_read_finish_row(png_ptr);
nuclear@14 681 return;
nuclear@14 682 }
nuclear@14 683 break;
nuclear@14 684 }
nuclear@14 685 }
nuclear@14 686 #endif
nuclear@14 687
nuclear@14 688 if (!(png_ptr->mode & PNG_HAVE_IDAT))
nuclear@14 689 png_error(png_ptr, "Invalid attempt to read row data");
nuclear@14 690
nuclear@14 691 png_ptr->zstream.next_out = png_ptr->row_buf;
nuclear@14 692 png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
nuclear@14 693 do
nuclear@14 694 {
nuclear@14 695 if (!(png_ptr->zstream.avail_in))
nuclear@14 696 {
nuclear@14 697 while (!png_ptr->idat_size)
nuclear@14 698 {
nuclear@14 699 png_crc_finish(png_ptr, 0);
nuclear@14 700
nuclear@14 701 png_ptr->idat_size = png_read_chunk_header(png_ptr);
nuclear@14 702 if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@14 703 png_error(png_ptr, "Not enough image data");
nuclear@14 704 }
nuclear@14 705 png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
nuclear@14 706 png_ptr->zstream.next_in = png_ptr->zbuf;
nuclear@14 707 if (png_ptr->zbuf_size > png_ptr->idat_size)
nuclear@14 708 png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
nuclear@14 709 png_crc_read(png_ptr, png_ptr->zbuf,
nuclear@14 710 (png_size_t)png_ptr->zstream.avail_in);
nuclear@14 711 png_ptr->idat_size -= png_ptr->zstream.avail_in;
nuclear@14 712 }
nuclear@14 713 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
nuclear@14 714 if (ret == Z_STREAM_END)
nuclear@14 715 {
nuclear@14 716 if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||
nuclear@14 717 png_ptr->idat_size)
nuclear@14 718 png_error(png_ptr, "Extra compressed data");
nuclear@14 719 png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@14 720 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
nuclear@14 721 break;
nuclear@14 722 }
nuclear@14 723 if (ret != Z_OK)
nuclear@14 724 png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
nuclear@14 725 "Decompression error");
nuclear@14 726
nuclear@14 727 } while (png_ptr->zstream.avail_out);
nuclear@14 728
nuclear@14 729 png_ptr->row_info.color_type = png_ptr->color_type;
nuclear@14 730 png_ptr->row_info.width = png_ptr->iwidth;
nuclear@14 731 png_ptr->row_info.channels = png_ptr->channels;
nuclear@14 732 png_ptr->row_info.bit_depth = png_ptr->bit_depth;
nuclear@14 733 png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
nuclear@14 734 png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
nuclear@14 735 png_ptr->row_info.width);
nuclear@14 736
nuclear@14 737 if (png_ptr->row_buf[0])
nuclear@14 738 png_read_filter_row(png_ptr, &(png_ptr->row_info),
nuclear@14 739 png_ptr->row_buf + 1, png_ptr->prev_row + 1,
nuclear@14 740 (int)(png_ptr->row_buf[0]));
nuclear@14 741
nuclear@14 742 png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
nuclear@14 743 png_ptr->rowbytes + 1);
nuclear@14 744
nuclear@14 745 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@14 746 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
nuclear@14 747 (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
nuclear@14 748 {
nuclear@14 749 /* Intrapixel differencing */
nuclear@14 750 png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
nuclear@14 751 }
nuclear@14 752 #endif
nuclear@14 753
nuclear@14 754
nuclear@14 755 if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
nuclear@14 756 png_do_read_transformations(png_ptr);
nuclear@14 757
nuclear@14 758 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@14 759 /* blow up interlaced rows to full size */
nuclear@14 760 if (png_ptr->interlaced &&
nuclear@14 761 (png_ptr->transformations & PNG_INTERLACE))
nuclear@14 762 {
nuclear@14 763 if (png_ptr->pass < 6)
nuclear@14 764 /* old interface (pre-1.0.9):
nuclear@14 765 png_do_read_interlace(&(png_ptr->row_info),
nuclear@14 766 png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
nuclear@14 767 */
nuclear@14 768 png_do_read_interlace(png_ptr);
nuclear@14 769
nuclear@14 770 if (dsp_row != NULL)
nuclear@14 771 png_combine_row(png_ptr, dsp_row,
nuclear@14 772 png_pass_dsp_mask[png_ptr->pass]);
nuclear@14 773 if (row != NULL)
nuclear@14 774 png_combine_row(png_ptr, row,
nuclear@14 775 png_pass_mask[png_ptr->pass]);
nuclear@14 776 }
nuclear@14 777 else
nuclear@14 778 #endif
nuclear@14 779 {
nuclear@14 780 if (row != NULL)
nuclear@14 781 png_combine_row(png_ptr, row, 0xff);
nuclear@14 782 if (dsp_row != NULL)
nuclear@14 783 png_combine_row(png_ptr, dsp_row, 0xff);
nuclear@14 784 }
nuclear@14 785 png_read_finish_row(png_ptr);
nuclear@14 786
nuclear@14 787 if (png_ptr->read_row_fn != NULL)
nuclear@14 788 (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
nuclear@14 789 }
nuclear@14 790 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@14 791
nuclear@14 792 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@14 793 /* Read one or more rows of image data. If the image is interlaced,
nuclear@14 794 * and png_set_interlace_handling() has been called, the rows need to
nuclear@14 795 * contain the contents of the rows from the previous pass. If the
nuclear@14 796 * image has alpha or transparency, and png_handle_alpha()[*] has been
nuclear@14 797 * called, the rows contents must be initialized to the contents of the
nuclear@14 798 * screen.
nuclear@14 799 *
nuclear@14 800 * "row" holds the actual image, and pixels are placed in it
nuclear@14 801 * as they arrive. If the image is displayed after each pass, it will
nuclear@14 802 * appear to "sparkle" in. "display_row" can be used to display a
nuclear@14 803 * "chunky" progressive image, with finer detail added as it becomes
nuclear@14 804 * available. If you do not want this "chunky" display, you may pass
nuclear@14 805 * NULL for display_row. If you do not want the sparkle display, and
nuclear@14 806 * you have not called png_handle_alpha(), you may pass NULL for rows.
nuclear@14 807 * If you have called png_handle_alpha(), and the image has either an
nuclear@14 808 * alpha channel or a transparency chunk, you must provide a buffer for
nuclear@14 809 * rows. In this case, you do not have to provide a display_row buffer
nuclear@14 810 * also, but you may. If the image is not interlaced, or if you have
nuclear@14 811 * not called png_set_interlace_handling(), the display_row buffer will
nuclear@14 812 * be ignored, so pass NULL to it.
nuclear@14 813 *
nuclear@14 814 * [*] png_handle_alpha() does not exist yet, as of this version of libpng
nuclear@14 815 */
nuclear@14 816
nuclear@14 817 void PNGAPI
nuclear@14 818 png_read_rows(png_structp png_ptr, png_bytepp row,
nuclear@14 819 png_bytepp display_row, png_uint_32 num_rows)
nuclear@14 820 {
nuclear@14 821 png_uint_32 i;
nuclear@14 822 png_bytepp rp;
nuclear@14 823 png_bytepp dp;
nuclear@14 824
nuclear@14 825 png_debug(1, "in png_read_rows\n");
nuclear@14 826 if (png_ptr == NULL) return;
nuclear@14 827 rp = row;
nuclear@14 828 dp = display_row;
nuclear@14 829 if (rp != NULL && dp != NULL)
nuclear@14 830 for (i = 0; i < num_rows; i++)
nuclear@14 831 {
nuclear@14 832 png_bytep rptr = *rp++;
nuclear@14 833 png_bytep dptr = *dp++;
nuclear@14 834
nuclear@14 835 png_read_row(png_ptr, rptr, dptr);
nuclear@14 836 }
nuclear@14 837 else if (rp != NULL)
nuclear@14 838 for (i = 0; i < num_rows; i++)
nuclear@14 839 {
nuclear@14 840 png_bytep rptr = *rp;
nuclear@14 841 png_read_row(png_ptr, rptr, png_bytep_NULL);
nuclear@14 842 rp++;
nuclear@14 843 }
nuclear@14 844 else if (dp != NULL)
nuclear@14 845 for (i = 0; i < num_rows; i++)
nuclear@14 846 {
nuclear@14 847 png_bytep dptr = *dp;
nuclear@14 848 png_read_row(png_ptr, png_bytep_NULL, dptr);
nuclear@14 849 dp++;
nuclear@14 850 }
nuclear@14 851 }
nuclear@14 852 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@14 853
nuclear@14 854 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@14 855 /* Read the entire image. If the image has an alpha channel or a tRNS
nuclear@14 856 * chunk, and you have called png_handle_alpha()[*], you will need to
nuclear@14 857 * initialize the image to the current image that PNG will be overlaying.
nuclear@14 858 * We set the num_rows again here, in case it was incorrectly set in
nuclear@14 859 * png_read_start_row() by a call to png_read_update_info() or
nuclear@14 860 * png_start_read_image() if png_set_interlace_handling() wasn't called
nuclear@14 861 * prior to either of these functions like it should have been. You can
nuclear@14 862 * only call this function once. If you desire to have an image for
nuclear@14 863 * each pass of a interlaced image, use png_read_rows() instead.
nuclear@14 864 *
nuclear@14 865 * [*] png_handle_alpha() does not exist yet, as of this version of libpng
nuclear@14 866 */
nuclear@14 867 void PNGAPI
nuclear@14 868 png_read_image(png_structp png_ptr, png_bytepp image)
nuclear@14 869 {
nuclear@14 870 png_uint_32 i, image_height;
nuclear@14 871 int pass, j;
nuclear@14 872 png_bytepp rp;
nuclear@14 873
nuclear@14 874 png_debug(1, "in png_read_image\n");
nuclear@14 875 if (png_ptr == NULL) return;
nuclear@14 876
nuclear@14 877 #ifdef PNG_READ_INTERLACING_SUPPORTED
nuclear@14 878 pass = png_set_interlace_handling(png_ptr);
nuclear@14 879 #else
nuclear@14 880 if (png_ptr->interlaced)
nuclear@14 881 png_error(png_ptr,
nuclear@14 882 "Cannot read interlaced image -- interlace handler disabled.");
nuclear@14 883 pass = 1;
nuclear@14 884 #endif
nuclear@14 885
nuclear@14 886
nuclear@14 887 image_height=png_ptr->height;
nuclear@14 888 png_ptr->num_rows = image_height; /* Make sure this is set correctly */
nuclear@14 889
nuclear@14 890 for (j = 0; j < pass; j++)
nuclear@14 891 {
nuclear@14 892 rp = image;
nuclear@14 893 for (i = 0; i < image_height; i++)
nuclear@14 894 {
nuclear@14 895 png_read_row(png_ptr, *rp, png_bytep_NULL);
nuclear@14 896 rp++;
nuclear@14 897 }
nuclear@14 898 }
nuclear@14 899 }
nuclear@14 900 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@14 901
nuclear@14 902 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@14 903 /* Read the end of the PNG file. Will not read past the end of the
nuclear@14 904 * file, will verify the end is accurate, and will read any comments
nuclear@14 905 * or time information at the end of the file, if info is not NULL.
nuclear@14 906 */
nuclear@14 907 void PNGAPI
nuclear@14 908 png_read_end(png_structp png_ptr, png_infop info_ptr)
nuclear@14 909 {
nuclear@14 910 png_debug(1, "in png_read_end\n");
nuclear@14 911 if (png_ptr == NULL) return;
nuclear@14 912 png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
nuclear@14 913
nuclear@14 914 do
nuclear@14 915 {
nuclear@14 916 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@14 917 PNG_CONST PNG_IHDR;
nuclear@14 918 PNG_CONST PNG_IDAT;
nuclear@14 919 PNG_CONST PNG_IEND;
nuclear@14 920 PNG_CONST PNG_PLTE;
nuclear@14 921 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@14 922 PNG_CONST PNG_bKGD;
nuclear@14 923 #endif
nuclear@14 924 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@14 925 PNG_CONST PNG_cHRM;
nuclear@14 926 #endif
nuclear@14 927 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@14 928 PNG_CONST PNG_gAMA;
nuclear@14 929 #endif
nuclear@14 930 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@14 931 PNG_CONST PNG_hIST;
nuclear@14 932 #endif
nuclear@14 933 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@14 934 PNG_CONST PNG_iCCP;
nuclear@14 935 #endif
nuclear@14 936 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@14 937 PNG_CONST PNG_iTXt;
nuclear@14 938 #endif
nuclear@14 939 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@14 940 PNG_CONST PNG_oFFs;
nuclear@14 941 #endif
nuclear@14 942 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@14 943 PNG_CONST PNG_pCAL;
nuclear@14 944 #endif
nuclear@14 945 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@14 946 PNG_CONST PNG_pHYs;
nuclear@14 947 #endif
nuclear@14 948 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@14 949 PNG_CONST PNG_sBIT;
nuclear@14 950 #endif
nuclear@14 951 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@14 952 PNG_CONST PNG_sCAL;
nuclear@14 953 #endif
nuclear@14 954 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@14 955 PNG_CONST PNG_sPLT;
nuclear@14 956 #endif
nuclear@14 957 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@14 958 PNG_CONST PNG_sRGB;
nuclear@14 959 #endif
nuclear@14 960 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@14 961 PNG_CONST PNG_tEXt;
nuclear@14 962 #endif
nuclear@14 963 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@14 964 PNG_CONST PNG_tIME;
nuclear@14 965 #endif
nuclear@14 966 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@14 967 PNG_CONST PNG_tRNS;
nuclear@14 968 #endif
nuclear@14 969 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@14 970 PNG_CONST PNG_zTXt;
nuclear@14 971 #endif
nuclear@14 972 #endif /* PNG_USE_LOCAL_ARRAYS */
nuclear@14 973 png_uint_32 length = png_read_chunk_header(png_ptr);
nuclear@14 974 PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
nuclear@14 975
nuclear@14 976 if (!png_memcmp(chunk_name, png_IHDR, 4))
nuclear@14 977 png_handle_IHDR(png_ptr, info_ptr, length);
nuclear@14 978 else if (!png_memcmp(chunk_name, png_IEND, 4))
nuclear@14 979 png_handle_IEND(png_ptr, info_ptr, length);
nuclear@14 980 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@14 981 else if (png_handle_as_unknown(png_ptr, chunk_name))
nuclear@14 982 {
nuclear@14 983 if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@14 984 {
nuclear@14 985 if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
nuclear@14 986 png_error(png_ptr, "Too many IDAT's found");
nuclear@14 987 }
nuclear@14 988 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@14 989 if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@14 990 png_ptr->mode |= PNG_HAVE_PLTE;
nuclear@14 991 }
nuclear@14 992 #endif
nuclear@14 993 else if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@14 994 {
nuclear@14 995 /* Zero length IDATs are legal after the last IDAT has been
nuclear@14 996 * read, but not after other chunks have been read.
nuclear@14 997 */
nuclear@14 998 if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
nuclear@14 999 png_error(png_ptr, "Too many IDAT's found");
nuclear@14 1000 png_crc_finish(png_ptr, length);
nuclear@14 1001 }
nuclear@14 1002 else if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@14 1003 png_handle_PLTE(png_ptr, info_ptr, length);
nuclear@14 1004 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@14 1005 else if (!png_memcmp(chunk_name, png_bKGD, 4))
nuclear@14 1006 png_handle_bKGD(png_ptr, info_ptr, length);
nuclear@14 1007 #endif
nuclear@14 1008 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@14 1009 else if (!png_memcmp(chunk_name, png_cHRM, 4))
nuclear@14 1010 png_handle_cHRM(png_ptr, info_ptr, length);
nuclear@14 1011 #endif
nuclear@14 1012 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@14 1013 else if (!png_memcmp(chunk_name, png_gAMA, 4))
nuclear@14 1014 png_handle_gAMA(png_ptr, info_ptr, length);
nuclear@14 1015 #endif
nuclear@14 1016 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@14 1017 else if (!png_memcmp(chunk_name, png_hIST, 4))
nuclear@14 1018 png_handle_hIST(png_ptr, info_ptr, length);
nuclear@14 1019 #endif
nuclear@14 1020 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@14 1021 else if (!png_memcmp(chunk_name, png_oFFs, 4))
nuclear@14 1022 png_handle_oFFs(png_ptr, info_ptr, length);
nuclear@14 1023 #endif
nuclear@14 1024 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@14 1025 else if (!png_memcmp(chunk_name, png_pCAL, 4))
nuclear@14 1026 png_handle_pCAL(png_ptr, info_ptr, length);
nuclear@14 1027 #endif
nuclear@14 1028 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@14 1029 else if (!png_memcmp(chunk_name, png_sCAL, 4))
nuclear@14 1030 png_handle_sCAL(png_ptr, info_ptr, length);
nuclear@14 1031 #endif
nuclear@14 1032 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@14 1033 else if (!png_memcmp(chunk_name, png_pHYs, 4))
nuclear@14 1034 png_handle_pHYs(png_ptr, info_ptr, length);
nuclear@14 1035 #endif
nuclear@14 1036 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@14 1037 else if (!png_memcmp(chunk_name, png_sBIT, 4))
nuclear@14 1038 png_handle_sBIT(png_ptr, info_ptr, length);
nuclear@14 1039 #endif
nuclear@14 1040 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@14 1041 else if (!png_memcmp(chunk_name, png_sRGB, 4))
nuclear@14 1042 png_handle_sRGB(png_ptr, info_ptr, length);
nuclear@14 1043 #endif
nuclear@14 1044 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@14 1045 else if (!png_memcmp(chunk_name, png_iCCP, 4))
nuclear@14 1046 png_handle_iCCP(png_ptr, info_ptr, length);
nuclear@14 1047 #endif
nuclear@14 1048 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@14 1049 else if (!png_memcmp(chunk_name, png_sPLT, 4))
nuclear@14 1050 png_handle_sPLT(png_ptr, info_ptr, length);
nuclear@14 1051 #endif
nuclear@14 1052 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@14 1053 else if (!png_memcmp(chunk_name, png_tEXt, 4))
nuclear@14 1054 png_handle_tEXt(png_ptr, info_ptr, length);
nuclear@14 1055 #endif
nuclear@14 1056 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@14 1057 else if (!png_memcmp(chunk_name, png_tIME, 4))
nuclear@14 1058 png_handle_tIME(png_ptr, info_ptr, length);
nuclear@14 1059 #endif
nuclear@14 1060 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@14 1061 else if (!png_memcmp(chunk_name, png_tRNS, 4))
nuclear@14 1062 png_handle_tRNS(png_ptr, info_ptr, length);
nuclear@14 1063 #endif
nuclear@14 1064 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@14 1065 else if (!png_memcmp(chunk_name, png_zTXt, 4))
nuclear@14 1066 png_handle_zTXt(png_ptr, info_ptr, length);
nuclear@14 1067 #endif
nuclear@14 1068 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@14 1069 else if (!png_memcmp(chunk_name, png_iTXt, 4))
nuclear@14 1070 png_handle_iTXt(png_ptr, info_ptr, length);
nuclear@14 1071 #endif
nuclear@14 1072 else
nuclear@14 1073 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@14 1074 } while (!(png_ptr->mode & PNG_HAVE_IEND));
nuclear@14 1075 }
nuclear@14 1076 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@14 1077
nuclear@14 1078 /* free all memory used by the read */
nuclear@14 1079 void PNGAPI
nuclear@14 1080 png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
nuclear@14 1081 png_infopp end_info_ptr_ptr)
nuclear@14 1082 {
nuclear@14 1083 png_structp png_ptr = NULL;
nuclear@14 1084 png_infop info_ptr = NULL, end_info_ptr = NULL;
nuclear@14 1085 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 1086 png_free_ptr free_fn = NULL;
nuclear@14 1087 png_voidp mem_ptr = NULL;
nuclear@14 1088 #endif
nuclear@14 1089
nuclear@14 1090 png_debug(1, "in png_destroy_read_struct\n");
nuclear@14 1091 if (png_ptr_ptr != NULL)
nuclear@14 1092 png_ptr = *png_ptr_ptr;
nuclear@14 1093 if (png_ptr == NULL)
nuclear@14 1094 return;
nuclear@14 1095
nuclear@14 1096 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 1097 free_fn = png_ptr->free_fn;
nuclear@14 1098 mem_ptr = png_ptr->mem_ptr;
nuclear@14 1099 #endif
nuclear@14 1100
nuclear@14 1101 if (info_ptr_ptr != NULL)
nuclear@14 1102 info_ptr = *info_ptr_ptr;
nuclear@14 1103
nuclear@14 1104 if (end_info_ptr_ptr != NULL)
nuclear@14 1105 end_info_ptr = *end_info_ptr_ptr;
nuclear@14 1106
nuclear@14 1107 png_read_destroy(png_ptr, info_ptr, end_info_ptr);
nuclear@14 1108
nuclear@14 1109 if (info_ptr != NULL)
nuclear@14 1110 {
nuclear@14 1111 #if defined(PNG_TEXT_SUPPORTED)
nuclear@14 1112 png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
nuclear@14 1113 #endif
nuclear@14 1114
nuclear@14 1115 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 1116 png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
nuclear@14 1117 (png_voidp)mem_ptr);
nuclear@14 1118 #else
nuclear@14 1119 png_destroy_struct((png_voidp)info_ptr);
nuclear@14 1120 #endif
nuclear@14 1121 *info_ptr_ptr = NULL;
nuclear@14 1122 }
nuclear@14 1123
nuclear@14 1124 if (end_info_ptr != NULL)
nuclear@14 1125 {
nuclear@14 1126 #if defined(PNG_READ_TEXT_SUPPORTED)
nuclear@14 1127 png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
nuclear@14 1128 #endif
nuclear@14 1129 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 1130 png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn,
nuclear@14 1131 (png_voidp)mem_ptr);
nuclear@14 1132 #else
nuclear@14 1133 png_destroy_struct((png_voidp)end_info_ptr);
nuclear@14 1134 #endif
nuclear@14 1135 *end_info_ptr_ptr = NULL;
nuclear@14 1136 }
nuclear@14 1137
nuclear@14 1138 if (png_ptr != NULL)
nuclear@14 1139 {
nuclear@14 1140 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 1141 png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
nuclear@14 1142 (png_voidp)mem_ptr);
nuclear@14 1143 #else
nuclear@14 1144 png_destroy_struct((png_voidp)png_ptr);
nuclear@14 1145 #endif
nuclear@14 1146 *png_ptr_ptr = NULL;
nuclear@14 1147 }
nuclear@14 1148 }
nuclear@14 1149
nuclear@14 1150 /* free all memory used by the read (old method) */
nuclear@14 1151 void /* PRIVATE */
nuclear@14 1152 png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
nuclear@14 1153 {
nuclear@14 1154 #ifdef PNG_SETJMP_SUPPORTED
nuclear@14 1155 jmp_buf tmp_jmp;
nuclear@14 1156 #endif
nuclear@14 1157 png_error_ptr error_fn;
nuclear@14 1158 png_error_ptr warning_fn;
nuclear@14 1159 png_voidp error_ptr;
nuclear@14 1160 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 1161 png_free_ptr free_fn;
nuclear@14 1162 #endif
nuclear@14 1163
nuclear@14 1164 png_debug(1, "in png_read_destroy\n");
nuclear@14 1165 if (info_ptr != NULL)
nuclear@14 1166 png_info_destroy(png_ptr, info_ptr);
nuclear@14 1167
nuclear@14 1168 if (end_info_ptr != NULL)
nuclear@14 1169 png_info_destroy(png_ptr, end_info_ptr);
nuclear@14 1170
nuclear@14 1171 png_free(png_ptr, png_ptr->zbuf);
nuclear@14 1172 png_free(png_ptr, png_ptr->big_row_buf);
nuclear@14 1173 png_free(png_ptr, png_ptr->prev_row);
nuclear@14 1174 png_free(png_ptr, png_ptr->chunkdata);
nuclear@14 1175 #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@14 1176 png_free(png_ptr, png_ptr->palette_lookup);
nuclear@14 1177 png_free(png_ptr, png_ptr->dither_index);
nuclear@14 1178 #endif
nuclear@14 1179 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@14 1180 png_free(png_ptr, png_ptr->gamma_table);
nuclear@14 1181 #endif
nuclear@14 1182 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@14 1183 png_free(png_ptr, png_ptr->gamma_from_1);
nuclear@14 1184 png_free(png_ptr, png_ptr->gamma_to_1);
nuclear@14 1185 #endif
nuclear@14 1186 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@14 1187 if (png_ptr->free_me & PNG_FREE_PLTE)
nuclear@14 1188 png_zfree(png_ptr, png_ptr->palette);
nuclear@14 1189 png_ptr->free_me &= ~PNG_FREE_PLTE;
nuclear@14 1190 #else
nuclear@14 1191 if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
nuclear@14 1192 png_zfree(png_ptr, png_ptr->palette);
nuclear@14 1193 png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
nuclear@14 1194 #endif
nuclear@14 1195 #if defined(PNG_tRNS_SUPPORTED) || \
nuclear@14 1196 defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@14 1197 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@14 1198 if (png_ptr->free_me & PNG_FREE_TRNS)
nuclear@14 1199 png_free(png_ptr, png_ptr->trans);
nuclear@14 1200 png_ptr->free_me &= ~PNG_FREE_TRNS;
nuclear@14 1201 #else
nuclear@14 1202 if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
nuclear@14 1203 png_free(png_ptr, png_ptr->trans);
nuclear@14 1204 png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
nuclear@14 1205 #endif
nuclear@14 1206 #endif
nuclear@14 1207 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@14 1208 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@14 1209 if (png_ptr->free_me & PNG_FREE_HIST)
nuclear@14 1210 png_free(png_ptr, png_ptr->hist);
nuclear@14 1211 png_ptr->free_me &= ~PNG_FREE_HIST;
nuclear@14 1212 #else
nuclear@14 1213 if (png_ptr->flags & PNG_FLAG_FREE_HIST)
nuclear@14 1214 png_free(png_ptr, png_ptr->hist);
nuclear@14 1215 png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
nuclear@14 1216 #endif
nuclear@14 1217 #endif
nuclear@14 1218 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@14 1219 if (png_ptr->gamma_16_table != NULL)
nuclear@14 1220 {
nuclear@14 1221 int i;
nuclear@14 1222 int istop = (1 << (8 - png_ptr->gamma_shift));
nuclear@14 1223 for (i = 0; i < istop; i++)
nuclear@14 1224 {
nuclear@14 1225 png_free(png_ptr, png_ptr->gamma_16_table[i]);
nuclear@14 1226 }
nuclear@14 1227 png_free(png_ptr, png_ptr->gamma_16_table);
nuclear@14 1228 }
nuclear@14 1229 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@14 1230 if (png_ptr->gamma_16_from_1 != NULL)
nuclear@14 1231 {
nuclear@14 1232 int i;
nuclear@14 1233 int istop = (1 << (8 - png_ptr->gamma_shift));
nuclear@14 1234 for (i = 0; i < istop; i++)
nuclear@14 1235 {
nuclear@14 1236 png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
nuclear@14 1237 }
nuclear@14 1238 png_free(png_ptr, png_ptr->gamma_16_from_1);
nuclear@14 1239 }
nuclear@14 1240 if (png_ptr->gamma_16_to_1 != NULL)
nuclear@14 1241 {
nuclear@14 1242 int i;
nuclear@14 1243 int istop = (1 << (8 - png_ptr->gamma_shift));
nuclear@14 1244 for (i = 0; i < istop; i++)
nuclear@14 1245 {
nuclear@14 1246 png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
nuclear@14 1247 }
nuclear@14 1248 png_free(png_ptr, png_ptr->gamma_16_to_1);
nuclear@14 1249 }
nuclear@14 1250 #endif
nuclear@14 1251 #endif
nuclear@14 1252 #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@14 1253 png_free(png_ptr, png_ptr->time_buffer);
nuclear@14 1254 #endif
nuclear@14 1255
nuclear@14 1256 inflateEnd(&png_ptr->zstream);
nuclear@14 1257 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@14 1258 png_free(png_ptr, png_ptr->save_buffer);
nuclear@14 1259 #endif
nuclear@14 1260
nuclear@14 1261 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@14 1262 #ifdef PNG_TEXT_SUPPORTED
nuclear@14 1263 png_free(png_ptr, png_ptr->current_text);
nuclear@14 1264 #endif /* PNG_TEXT_SUPPORTED */
nuclear@14 1265 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
nuclear@14 1266
nuclear@14 1267 /* Save the important info out of the png_struct, in case it is
nuclear@14 1268 * being used again.
nuclear@14 1269 */
nuclear@14 1270 #ifdef PNG_SETJMP_SUPPORTED
nuclear@14 1271 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@14 1272 #endif
nuclear@14 1273
nuclear@14 1274 error_fn = png_ptr->error_fn;
nuclear@14 1275 warning_fn = png_ptr->warning_fn;
nuclear@14 1276 error_ptr = png_ptr->error_ptr;
nuclear@14 1277 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 1278 free_fn = png_ptr->free_fn;
nuclear@14 1279 #endif
nuclear@14 1280
nuclear@14 1281 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@14 1282
nuclear@14 1283 png_ptr->error_fn = error_fn;
nuclear@14 1284 png_ptr->warning_fn = warning_fn;
nuclear@14 1285 png_ptr->error_ptr = error_ptr;
nuclear@14 1286 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 1287 png_ptr->free_fn = free_fn;
nuclear@14 1288 #endif
nuclear@14 1289
nuclear@14 1290 #ifdef PNG_SETJMP_SUPPORTED
nuclear@14 1291 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@14 1292 #endif
nuclear@14 1293
nuclear@14 1294 }
nuclear@14 1295
nuclear@14 1296 void PNGAPI
nuclear@14 1297 png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
nuclear@14 1298 {
nuclear@14 1299 if (png_ptr == NULL) return;
nuclear@14 1300 png_ptr->read_row_fn = read_row_fn;
nuclear@14 1301 }
nuclear@14 1302
nuclear@14 1303
nuclear@14 1304 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@14 1305 #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@14 1306 void PNGAPI
nuclear@14 1307 png_read_png(png_structp png_ptr, png_infop info_ptr,
nuclear@14 1308 int transforms,
nuclear@14 1309 voidp params)
nuclear@14 1310 {
nuclear@14 1311 int row;
nuclear@14 1312
nuclear@14 1313 if (png_ptr == NULL) return;
nuclear@14 1314 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
nuclear@14 1315 /* invert the alpha channel from opacity to transparency
nuclear@14 1316 */
nuclear@14 1317 if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
nuclear@14 1318 png_set_invert_alpha(png_ptr);
nuclear@14 1319 #endif
nuclear@14 1320
nuclear@14 1321 /* png_read_info() gives us all of the information from the
nuclear@14 1322 * PNG file before the first IDAT (image data chunk).
nuclear@14 1323 */
nuclear@14 1324 png_read_info(png_ptr, info_ptr);
nuclear@14 1325 if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
nuclear@14 1326 png_error(png_ptr, "Image is too high to process with png_read_png()");
nuclear@14 1327
nuclear@14 1328 /* -------------- image transformations start here ------------------- */
nuclear@14 1329
nuclear@14 1330 #if defined(PNG_READ_16_TO_8_SUPPORTED)
nuclear@14 1331 /* tell libpng to strip 16 bit/color files down to 8 bits per color
nuclear@14 1332 */
nuclear@14 1333 if (transforms & PNG_TRANSFORM_STRIP_16)
nuclear@14 1334 png_set_strip_16(png_ptr);
nuclear@14 1335 #endif
nuclear@14 1336
nuclear@14 1337 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
nuclear@14 1338 /* Strip alpha bytes from the input data without combining with
nuclear@14 1339 * the background (not recommended).
nuclear@14 1340 */
nuclear@14 1341 if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
nuclear@14 1342 png_set_strip_alpha(png_ptr);
nuclear@14 1343 #endif
nuclear@14 1344
nuclear@14 1345 #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@14 1346 /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single
nuclear@14 1347 * byte into separate bytes (useful for paletted and grayscale images).
nuclear@14 1348 */
nuclear@14 1349 if (transforms & PNG_TRANSFORM_PACKING)
nuclear@14 1350 png_set_packing(png_ptr);
nuclear@14 1351 #endif
nuclear@14 1352
nuclear@14 1353 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@14 1354 /* Change the order of packed pixels to least significant bit first
nuclear@14 1355 * (not useful if you are using png_set_packing).
nuclear@14 1356 */
nuclear@14 1357 if (transforms & PNG_TRANSFORM_PACKSWAP)
nuclear@14 1358 png_set_packswap(png_ptr);
nuclear@14 1359 #endif
nuclear@14 1360
nuclear@14 1361 #if defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@14 1362 /* Expand paletted colors into true RGB triplets
nuclear@14 1363 * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
nuclear@14 1364 * Expand paletted or RGB images with transparency to full alpha
nuclear@14 1365 * channels so the data will be available as RGBA quartets.
nuclear@14 1366 */
nuclear@14 1367 if (transforms & PNG_TRANSFORM_EXPAND)
nuclear@14 1368 if ((png_ptr->bit_depth < 8) ||
nuclear@14 1369 (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
nuclear@14 1370 (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
nuclear@14 1371 png_set_expand(png_ptr);
nuclear@14 1372 #endif
nuclear@14 1373
nuclear@14 1374 /* We don't handle background color or gamma transformation or dithering.
nuclear@14 1375 */
nuclear@14 1376
nuclear@14 1377 #if defined(PNG_READ_INVERT_SUPPORTED)
nuclear@14 1378 /* invert monochrome files to have 0 as white and 1 as black
nuclear@14 1379 */
nuclear@14 1380 if (transforms & PNG_TRANSFORM_INVERT_MONO)
nuclear@14 1381 png_set_invert_mono(png_ptr);
nuclear@14 1382 #endif
nuclear@14 1383
nuclear@14 1384 #if defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@14 1385 /* If you want to shift the pixel values from the range [0,255] or
nuclear@14 1386 * [0,65535] to the original [0,7] or [0,31], or whatever range the
nuclear@14 1387 * colors were originally in:
nuclear@14 1388 */
nuclear@14 1389 if ((transforms & PNG_TRANSFORM_SHIFT)
nuclear@14 1390 && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
nuclear@14 1391 {
nuclear@14 1392 png_color_8p sig_bit;
nuclear@14 1393
nuclear@14 1394 png_get_sBIT(png_ptr, info_ptr, &sig_bit);
nuclear@14 1395 png_set_shift(png_ptr, sig_bit);
nuclear@14 1396 }
nuclear@14 1397 #endif
nuclear@14 1398
nuclear@14 1399 #if defined(PNG_READ_BGR_SUPPORTED)
nuclear@14 1400 /* flip the RGB pixels to BGR (or RGBA to BGRA)
nuclear@14 1401 */
nuclear@14 1402 if (transforms & PNG_TRANSFORM_BGR)
nuclear@14 1403 png_set_bgr(png_ptr);
nuclear@14 1404 #endif
nuclear@14 1405
nuclear@14 1406 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
nuclear@14 1407 /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
nuclear@14 1408 */
nuclear@14 1409 if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
nuclear@14 1410 png_set_swap_alpha(png_ptr);
nuclear@14 1411 #endif
nuclear@14 1412
nuclear@14 1413 #if defined(PNG_READ_SWAP_SUPPORTED)
nuclear@14 1414 /* swap bytes of 16 bit files to least significant byte first
nuclear@14 1415 */
nuclear@14 1416 if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
nuclear@14 1417 png_set_swap(png_ptr);
nuclear@14 1418 #endif
nuclear@14 1419
nuclear@14 1420 /* We don't handle adding filler bytes */
nuclear@14 1421
nuclear@14 1422 /* Optional call to gamma correct and add the background to the palette
nuclear@14 1423 * and update info structure. REQUIRED if you are expecting libpng to
nuclear@14 1424 * update the palette for you (i.e., you selected such a transform above).
nuclear@14 1425 */
nuclear@14 1426 png_read_update_info(png_ptr, info_ptr);
nuclear@14 1427
nuclear@14 1428 /* -------------- image transformations end here ------------------- */
nuclear@14 1429
nuclear@14 1430 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@14 1431 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
nuclear@14 1432 #endif
nuclear@14 1433 if (info_ptr->row_pointers == NULL)
nuclear@14 1434 {
nuclear@14 1435 info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
nuclear@14 1436 info_ptr->height * png_sizeof(png_bytep));
nuclear@14 1437 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@14 1438 info_ptr->free_me |= PNG_FREE_ROWS;
nuclear@14 1439 #endif
nuclear@14 1440 for (row = 0; row < (int)info_ptr->height; row++)
nuclear@14 1441 {
nuclear@14 1442 info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
nuclear@14 1443 png_get_rowbytes(png_ptr, info_ptr));
nuclear@14 1444 }
nuclear@14 1445 }
nuclear@14 1446
nuclear@14 1447 png_read_image(png_ptr, info_ptr->row_pointers);
nuclear@14 1448 info_ptr->valid |= PNG_INFO_IDAT;
nuclear@14 1449
nuclear@14 1450 /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
nuclear@14 1451 png_read_end(png_ptr, info_ptr);
nuclear@14 1452
nuclear@14 1453 transforms = transforms; /* quiet compiler warnings */
nuclear@14 1454 params = params;
nuclear@14 1455
nuclear@14 1456 }
nuclear@14 1457 #endif /* PNG_INFO_IMAGE_SUPPORTED */
nuclear@14 1458 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@14 1459 #endif /* PNG_READ_SUPPORTED */