dbf-halloween2015

annotate libs/libpng/pngread.c @ 3:c37fe5d8a4ed

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windows port
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 01 Nov 2015 06:04:28 +0200
parents
children
rev   line source
nuclear@1 1
nuclear@1 2 /* pngread.c - read a PNG file
nuclear@1 3 *
nuclear@1 4 * Last changed in libpng 1.2.30 [August 15, 2008]
nuclear@1 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@1 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@1 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@1 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@1 9 *
nuclear@1 10 * This file contains routines that an application calls directly to
nuclear@1 11 * read a PNG file or stream.
nuclear@1 12 */
nuclear@1 13
nuclear@1 14 #define PNG_INTERNAL
nuclear@1 15 #include "png.h"
nuclear@1 16 #if defined(PNG_READ_SUPPORTED)
nuclear@1 17
nuclear@1 18 /* Create a PNG structure for reading, and allocate any memory needed. */
nuclear@1 19 png_structp PNGAPI
nuclear@1 20 png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@1 21 png_error_ptr error_fn, png_error_ptr warn_fn)
nuclear@1 22 {
nuclear@1 23
nuclear@1 24 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 25 return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
nuclear@1 26 warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
nuclear@1 27 }
nuclear@1 28
nuclear@1 29 /* Alternate create PNG structure for reading, and allocate any memory needed. */
nuclear@1 30 png_structp PNGAPI
nuclear@1 31 png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@1 32 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@1 33 png_malloc_ptr malloc_fn, png_free_ptr free_fn)
nuclear@1 34 {
nuclear@1 35 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@1 36
nuclear@1 37 #ifdef PNG_SETJMP_SUPPORTED
nuclear@1 38 volatile
nuclear@1 39 #endif
nuclear@1 40 png_structp png_ptr;
nuclear@1 41
nuclear@1 42 #ifdef PNG_SETJMP_SUPPORTED
nuclear@1 43 #ifdef USE_FAR_KEYWORD
nuclear@1 44 jmp_buf jmpbuf;
nuclear@1 45 #endif
nuclear@1 46 #endif
nuclear@1 47
nuclear@1 48 int i;
nuclear@1 49
nuclear@1 50 png_debug(1, "in png_create_read_struct\n");
nuclear@1 51 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 52 png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
nuclear@1 53 (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
nuclear@1 54 #else
nuclear@1 55 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@1 56 #endif
nuclear@1 57 if (png_ptr == NULL)
nuclear@1 58 return (NULL);
nuclear@1 59
nuclear@1 60 /* added at libpng-1.2.6 */
nuclear@1 61 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@1 62 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@1 63 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@1 64 #endif
nuclear@1 65
nuclear@1 66 #ifdef PNG_SETJMP_SUPPORTED
nuclear@1 67 #ifdef USE_FAR_KEYWORD
nuclear@1 68 if (setjmp(jmpbuf))
nuclear@1 69 #else
nuclear@1 70 if (setjmp(png_ptr->jmpbuf))
nuclear@1 71 #endif
nuclear@1 72 {
nuclear@1 73 png_free(png_ptr, png_ptr->zbuf);
nuclear@1 74 png_ptr->zbuf = NULL;
nuclear@1 75 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 76 png_destroy_struct_2((png_voidp)png_ptr,
nuclear@1 77 (png_free_ptr)free_fn, (png_voidp)mem_ptr);
nuclear@1 78 #else
nuclear@1 79 png_destroy_struct((png_voidp)png_ptr);
nuclear@1 80 #endif
nuclear@1 81 return (NULL);
nuclear@1 82 }
nuclear@1 83 #ifdef USE_FAR_KEYWORD
nuclear@1 84 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@1 85 #endif
nuclear@1 86 #endif
nuclear@1 87
nuclear@1 88 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 89 png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
nuclear@1 90 #endif
nuclear@1 91
nuclear@1 92 png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
nuclear@1 93
nuclear@1 94 if (user_png_ver)
nuclear@1 95 {
nuclear@1 96 i = 0;
nuclear@1 97 do
nuclear@1 98 {
nuclear@1 99 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@1 100 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@1 101 } while (png_libpng_ver[i++]);
nuclear@1 102 }
nuclear@1 103 else
nuclear@1 104 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@1 105
nuclear@1 106
nuclear@1 107 if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
nuclear@1 108 {
nuclear@1 109 /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
nuclear@1 110 * we must recompile any applications that use any older library version.
nuclear@1 111 * For versions after libpng 1.0, we will be compatible, so we need
nuclear@1 112 * only check the first digit.
nuclear@1 113 */
nuclear@1 114 if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
nuclear@1 115 (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
nuclear@1 116 (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
nuclear@1 117 {
nuclear@1 118 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@1 119 char msg[80];
nuclear@1 120 if (user_png_ver)
nuclear@1 121 {
nuclear@1 122 png_snprintf(msg, 80,
nuclear@1 123 "Application was compiled with png.h from libpng-%.20s",
nuclear@1 124 user_png_ver);
nuclear@1 125 png_warning(png_ptr, msg);
nuclear@1 126 }
nuclear@1 127 png_snprintf(msg, 80,
nuclear@1 128 "Application is running with png.c from libpng-%.20s",
nuclear@1 129 png_libpng_ver);
nuclear@1 130 png_warning(png_ptr, msg);
nuclear@1 131 #endif
nuclear@1 132 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@1 133 png_ptr->flags = 0;
nuclear@1 134 #endif
nuclear@1 135 png_error(png_ptr,
nuclear@1 136 "Incompatible libpng version in application and library");
nuclear@1 137 }
nuclear@1 138 }
nuclear@1 139
nuclear@1 140 /* initialize zbuf - compression buffer */
nuclear@1 141 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@1 142 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@1 143 (png_uint_32)png_ptr->zbuf_size);
nuclear@1 144 png_ptr->zstream.zalloc = png_zalloc;
nuclear@1 145 png_ptr->zstream.zfree = png_zfree;
nuclear@1 146 png_ptr->zstream.opaque = (voidpf)png_ptr;
nuclear@1 147
nuclear@1 148 switch (inflateInit(&png_ptr->zstream))
nuclear@1 149 {
nuclear@1 150 case Z_OK: /* Do nothing */ break;
nuclear@1 151 case Z_MEM_ERROR:
nuclear@1 152 case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;
nuclear@1 153 case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break;
nuclear@1 154 default: png_error(png_ptr, "Unknown zlib error");
nuclear@1 155 }
nuclear@1 156
nuclear@1 157 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@1 158 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@1 159
nuclear@1 160 png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
nuclear@1 161
nuclear@1 162 #ifdef PNG_SETJMP_SUPPORTED
nuclear@1 163 /* Applications that neglect to set up their own setjmp() and then encounter
nuclear@1 164 a png_error() will longjmp here. Since the jmpbuf is then meaningless we
nuclear@1 165 abort instead of returning. */
nuclear@1 166 #ifdef USE_FAR_KEYWORD
nuclear@1 167 if (setjmp(jmpbuf))
nuclear@1 168 PNG_ABORT();
nuclear@1 169 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@1 170 #else
nuclear@1 171 if (setjmp(png_ptr->jmpbuf))
nuclear@1 172 PNG_ABORT();
nuclear@1 173 #endif
nuclear@1 174 #endif
nuclear@1 175 return (png_ptr);
nuclear@1 176 }
nuclear@1 177
nuclear@1 178 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
nuclear@1 179 /* Initialize PNG structure for reading, and allocate any memory needed.
nuclear@1 180 This interface is deprecated in favour of the png_create_read_struct(),
nuclear@1 181 and it will disappear as of libpng-1.3.0. */
nuclear@1 182 #undef png_read_init
nuclear@1 183 void PNGAPI
nuclear@1 184 png_read_init(png_structp png_ptr)
nuclear@1 185 {
nuclear@1 186 /* We only come here via pre-1.0.7-compiled applications */
nuclear@1 187 png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
nuclear@1 188 }
nuclear@1 189
nuclear@1 190 void PNGAPI
nuclear@1 191 png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
nuclear@1 192 png_size_t png_struct_size, png_size_t png_info_size)
nuclear@1 193 {
nuclear@1 194 /* We only come here via pre-1.0.12-compiled applications */
nuclear@1 195 if (png_ptr == NULL) return;
nuclear@1 196 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@1 197 if (png_sizeof(png_struct) > png_struct_size ||
nuclear@1 198 png_sizeof(png_info) > png_info_size)
nuclear@1 199 {
nuclear@1 200 char msg[80];
nuclear@1 201 png_ptr->warning_fn = NULL;
nuclear@1 202 if (user_png_ver)
nuclear@1 203 {
nuclear@1 204 png_snprintf(msg, 80,
nuclear@1 205 "Application was compiled with png.h from libpng-%.20s",
nuclear@1 206 user_png_ver);
nuclear@1 207 png_warning(png_ptr, msg);
nuclear@1 208 }
nuclear@1 209 png_snprintf(msg, 80,
nuclear@1 210 "Application is running with png.c from libpng-%.20s",
nuclear@1 211 png_libpng_ver);
nuclear@1 212 png_warning(png_ptr, msg);
nuclear@1 213 }
nuclear@1 214 #endif
nuclear@1 215 if (png_sizeof(png_struct) > png_struct_size)
nuclear@1 216 {
nuclear@1 217 png_ptr->error_fn = NULL;
nuclear@1 218 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@1 219 png_ptr->flags = 0;
nuclear@1 220 #endif
nuclear@1 221 png_error(png_ptr,
nuclear@1 222 "The png struct allocated by the application for reading is too small.");
nuclear@1 223 }
nuclear@1 224 if (png_sizeof(png_info) > png_info_size)
nuclear@1 225 {
nuclear@1 226 png_ptr->error_fn = NULL;
nuclear@1 227 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@1 228 png_ptr->flags = 0;
nuclear@1 229 #endif
nuclear@1 230 png_error(png_ptr,
nuclear@1 231 "The info struct allocated by application for reading is too small.");
nuclear@1 232 }
nuclear@1 233 png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
nuclear@1 234 }
nuclear@1 235 #endif /* PNG_1_0_X || PNG_1_2_X */
nuclear@1 236
nuclear@1 237 void PNGAPI
nuclear@1 238 png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
nuclear@1 239 png_size_t png_struct_size)
nuclear@1 240 {
nuclear@1 241 #ifdef PNG_SETJMP_SUPPORTED
nuclear@1 242 jmp_buf tmp_jmp; /* to save current jump buffer */
nuclear@1 243 #endif
nuclear@1 244
nuclear@1 245 int i = 0;
nuclear@1 246
nuclear@1 247 png_structp png_ptr=*ptr_ptr;
nuclear@1 248
nuclear@1 249 if (png_ptr == NULL) return;
nuclear@1 250
nuclear@1 251 do
nuclear@1 252 {
nuclear@1 253 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@1 254 {
nuclear@1 255 #ifdef PNG_LEGACY_SUPPORTED
nuclear@1 256 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@1 257 #else
nuclear@1 258 png_ptr->warning_fn = NULL;
nuclear@1 259 png_warning(png_ptr,
nuclear@1 260 "Application uses deprecated png_read_init() and should be recompiled.");
nuclear@1 261 break;
nuclear@1 262 #endif
nuclear@1 263 }
nuclear@1 264 } while (png_libpng_ver[i++]);
nuclear@1 265
nuclear@1 266 png_debug(1, "in png_read_init_3\n");
nuclear@1 267
nuclear@1 268 #ifdef PNG_SETJMP_SUPPORTED
nuclear@1 269 /* save jump buffer and error functions */
nuclear@1 270 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@1 271 #endif
nuclear@1 272
nuclear@1 273 if (png_sizeof(png_struct) > png_struct_size)
nuclear@1 274 {
nuclear@1 275 png_destroy_struct(png_ptr);
nuclear@1 276 *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@1 277 png_ptr = *ptr_ptr;
nuclear@1 278 }
nuclear@1 279
nuclear@1 280 /* reset all variables to 0 */
nuclear@1 281 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@1 282
nuclear@1 283 #ifdef PNG_SETJMP_SUPPORTED
nuclear@1 284 /* restore jump buffer */
nuclear@1 285 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@1 286 #endif
nuclear@1 287
nuclear@1 288 /* added at libpng-1.2.6 */
nuclear@1 289 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@1 290 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@1 291 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@1 292 #endif
nuclear@1 293
nuclear@1 294 /* initialize zbuf - compression buffer */
nuclear@1 295 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@1 296 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@1 297 (png_uint_32)png_ptr->zbuf_size);
nuclear@1 298 png_ptr->zstream.zalloc = png_zalloc;
nuclear@1 299 png_ptr->zstream.zfree = png_zfree;
nuclear@1 300 png_ptr->zstream.opaque = (voidpf)png_ptr;
nuclear@1 301
nuclear@1 302 switch (inflateInit(&png_ptr->zstream))
nuclear@1 303 {
nuclear@1 304 case Z_OK: /* Do nothing */ break;
nuclear@1 305 case Z_MEM_ERROR:
nuclear@1 306 case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break;
nuclear@1 307 case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break;
nuclear@1 308 default: png_error(png_ptr, "Unknown zlib error");
nuclear@1 309 }
nuclear@1 310
nuclear@1 311 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@1 312 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@1 313
nuclear@1 314 png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
nuclear@1 315 }
nuclear@1 316
nuclear@1 317 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@1 318 /* Read the information before the actual image data. This has been
nuclear@1 319 * changed in v0.90 to allow reading a file that already has the magic
nuclear@1 320 * bytes read from the stream. You can tell libpng how many bytes have
nuclear@1 321 * been read from the beginning of the stream (up to the maximum of 8)
nuclear@1 322 * via png_set_sig_bytes(), and we will only check the remaining bytes
nuclear@1 323 * here. The application can then have access to the signature bytes we
nuclear@1 324 * read if it is determined that this isn't a valid PNG file.
nuclear@1 325 */
nuclear@1 326 void PNGAPI
nuclear@1 327 png_read_info(png_structp png_ptr, png_infop info_ptr)
nuclear@1 328 {
nuclear@1 329 if (png_ptr == NULL || info_ptr == NULL) return;
nuclear@1 330 png_debug(1, "in png_read_info\n");
nuclear@1 331 /* If we haven't checked all of the PNG signature bytes, do so now. */
nuclear@1 332 if (png_ptr->sig_bytes < 8)
nuclear@1 333 {
nuclear@1 334 png_size_t num_checked = png_ptr->sig_bytes,
nuclear@1 335 num_to_check = 8 - num_checked;
nuclear@1 336
nuclear@1 337 png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
nuclear@1 338 png_ptr->sig_bytes = 8;
nuclear@1 339
nuclear@1 340 if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
nuclear@1 341 {
nuclear@1 342 if (num_checked < 4 &&
nuclear@1 343 png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
nuclear@1 344 png_error(png_ptr, "Not a PNG file");
nuclear@1 345 else
nuclear@1 346 png_error(png_ptr, "PNG file corrupted by ASCII conversion");
nuclear@1 347 }
nuclear@1 348 if (num_checked < 3)
nuclear@1 349 png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
nuclear@1 350 }
nuclear@1 351
nuclear@1 352 for (;;)
nuclear@1 353 {
nuclear@1 354 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@1 355 PNG_CONST PNG_IHDR;
nuclear@1 356 PNG_CONST PNG_IDAT;
nuclear@1 357 PNG_CONST PNG_IEND;
nuclear@1 358 PNG_CONST PNG_PLTE;
nuclear@1 359 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@1 360 PNG_CONST PNG_bKGD;
nuclear@1 361 #endif
nuclear@1 362 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@1 363 PNG_CONST PNG_cHRM;
nuclear@1 364 #endif
nuclear@1 365 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@1 366 PNG_CONST PNG_gAMA;
nuclear@1 367 #endif
nuclear@1 368 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@1 369 PNG_CONST PNG_hIST;
nuclear@1 370 #endif
nuclear@1 371 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@1 372 PNG_CONST PNG_iCCP;
nuclear@1 373 #endif
nuclear@1 374 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@1 375 PNG_CONST PNG_iTXt;
nuclear@1 376 #endif
nuclear@1 377 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@1 378 PNG_CONST PNG_oFFs;
nuclear@1 379 #endif
nuclear@1 380 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@1 381 PNG_CONST PNG_pCAL;
nuclear@1 382 #endif
nuclear@1 383 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@1 384 PNG_CONST PNG_pHYs;
nuclear@1 385 #endif
nuclear@1 386 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@1 387 PNG_CONST PNG_sBIT;
nuclear@1 388 #endif
nuclear@1 389 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@1 390 PNG_CONST PNG_sCAL;
nuclear@1 391 #endif
nuclear@1 392 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@1 393 PNG_CONST PNG_sPLT;
nuclear@1 394 #endif
nuclear@1 395 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@1 396 PNG_CONST PNG_sRGB;
nuclear@1 397 #endif
nuclear@1 398 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@1 399 PNG_CONST PNG_tEXt;
nuclear@1 400 #endif
nuclear@1 401 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@1 402 PNG_CONST PNG_tIME;
nuclear@1 403 #endif
nuclear@1 404 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@1 405 PNG_CONST PNG_tRNS;
nuclear@1 406 #endif
nuclear@1 407 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@1 408 PNG_CONST PNG_zTXt;
nuclear@1 409 #endif
nuclear@1 410 #endif /* PNG_USE_LOCAL_ARRAYS */
nuclear@1 411 png_uint_32 length = png_read_chunk_header(png_ptr);
nuclear@1 412 PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
nuclear@1 413
nuclear@1 414 /* This should be a binary subdivision search or a hash for
nuclear@1 415 * matching the chunk name rather than a linear search.
nuclear@1 416 */
nuclear@1 417 if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@1 418 if (png_ptr->mode & PNG_AFTER_IDAT)
nuclear@1 419 png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
nuclear@1 420
nuclear@1 421 if (!png_memcmp(chunk_name, png_IHDR, 4))
nuclear@1 422 png_handle_IHDR(png_ptr, info_ptr, length);
nuclear@1 423 else if (!png_memcmp(chunk_name, png_IEND, 4))
nuclear@1 424 png_handle_IEND(png_ptr, info_ptr, length);
nuclear@1 425 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@1 426 else if (png_handle_as_unknown(png_ptr, chunk_name))
nuclear@1 427 {
nuclear@1 428 if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@1 429 png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@1 430 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@1 431 if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@1 432 png_ptr->mode |= PNG_HAVE_PLTE;
nuclear@1 433 else if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@1 434 {
nuclear@1 435 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@1 436 png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@1 437 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@1 438 !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@1 439 png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@1 440 break;
nuclear@1 441 }
nuclear@1 442 }
nuclear@1 443 #endif
nuclear@1 444 else if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@1 445 png_handle_PLTE(png_ptr, info_ptr, length);
nuclear@1 446 else if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@1 447 {
nuclear@1 448 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@1 449 png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@1 450 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@1 451 !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@1 452 png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@1 453
nuclear@1 454 png_ptr->idat_size = length;
nuclear@1 455 png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@1 456 break;
nuclear@1 457 }
nuclear@1 458 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@1 459 else if (!png_memcmp(chunk_name, png_bKGD, 4))
nuclear@1 460 png_handle_bKGD(png_ptr, info_ptr, length);
nuclear@1 461 #endif
nuclear@1 462 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@1 463 else if (!png_memcmp(chunk_name, png_cHRM, 4))
nuclear@1 464 png_handle_cHRM(png_ptr, info_ptr, length);
nuclear@1 465 #endif
nuclear@1 466 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@1 467 else if (!png_memcmp(chunk_name, png_gAMA, 4))
nuclear@1 468 png_handle_gAMA(png_ptr, info_ptr, length);
nuclear@1 469 #endif
nuclear@1 470 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@1 471 else if (!png_memcmp(chunk_name, png_hIST, 4))
nuclear@1 472 png_handle_hIST(png_ptr, info_ptr, length);
nuclear@1 473 #endif
nuclear@1 474 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@1 475 else if (!png_memcmp(chunk_name, png_oFFs, 4))
nuclear@1 476 png_handle_oFFs(png_ptr, info_ptr, length);
nuclear@1 477 #endif
nuclear@1 478 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@1 479 else if (!png_memcmp(chunk_name, png_pCAL, 4))
nuclear@1 480 png_handle_pCAL(png_ptr, info_ptr, length);
nuclear@1 481 #endif
nuclear@1 482 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@1 483 else if (!png_memcmp(chunk_name, png_sCAL, 4))
nuclear@1 484 png_handle_sCAL(png_ptr, info_ptr, length);
nuclear@1 485 #endif
nuclear@1 486 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@1 487 else if (!png_memcmp(chunk_name, png_pHYs, 4))
nuclear@1 488 png_handle_pHYs(png_ptr, info_ptr, length);
nuclear@1 489 #endif
nuclear@1 490 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@1 491 else if (!png_memcmp(chunk_name, png_sBIT, 4))
nuclear@1 492 png_handle_sBIT(png_ptr, info_ptr, length);
nuclear@1 493 #endif
nuclear@1 494 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@1 495 else if (!png_memcmp(chunk_name, png_sRGB, 4))
nuclear@1 496 png_handle_sRGB(png_ptr, info_ptr, length);
nuclear@1 497 #endif
nuclear@1 498 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@1 499 else if (!png_memcmp(chunk_name, png_iCCP, 4))
nuclear@1 500 png_handle_iCCP(png_ptr, info_ptr, length);
nuclear@1 501 #endif
nuclear@1 502 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@1 503 else if (!png_memcmp(chunk_name, png_sPLT, 4))
nuclear@1 504 png_handle_sPLT(png_ptr, info_ptr, length);
nuclear@1 505 #endif
nuclear@1 506 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@1 507 else if (!png_memcmp(chunk_name, png_tEXt, 4))
nuclear@1 508 png_handle_tEXt(png_ptr, info_ptr, length);
nuclear@1 509 #endif
nuclear@1 510 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@1 511 else if (!png_memcmp(chunk_name, png_tIME, 4))
nuclear@1 512 png_handle_tIME(png_ptr, info_ptr, length);
nuclear@1 513 #endif
nuclear@1 514 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@1 515 else if (!png_memcmp(chunk_name, png_tRNS, 4))
nuclear@1 516 png_handle_tRNS(png_ptr, info_ptr, length);
nuclear@1 517 #endif
nuclear@1 518 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@1 519 else if (!png_memcmp(chunk_name, png_zTXt, 4))
nuclear@1 520 png_handle_zTXt(png_ptr, info_ptr, length);
nuclear@1 521 #endif
nuclear@1 522 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@1 523 else if (!png_memcmp(chunk_name, png_iTXt, 4))
nuclear@1 524 png_handle_iTXt(png_ptr, info_ptr, length);
nuclear@1 525 #endif
nuclear@1 526 else
nuclear@1 527 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@1 528 }
nuclear@1 529 }
nuclear@1 530 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@1 531
nuclear@1 532 /* optional call to update the users info_ptr structure */
nuclear@1 533 void PNGAPI
nuclear@1 534 png_read_update_info(png_structp png_ptr, png_infop info_ptr)
nuclear@1 535 {
nuclear@1 536 png_debug(1, "in png_read_update_info\n");
nuclear@1 537 if (png_ptr == NULL) return;
nuclear@1 538 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
nuclear@1 539 png_read_start_row(png_ptr);
nuclear@1 540 else
nuclear@1 541 png_warning(png_ptr,
nuclear@1 542 "Ignoring extra png_read_update_info() call; row buffer not reallocated");
nuclear@1 543 png_read_transform_info(png_ptr, info_ptr);
nuclear@1 544 }
nuclear@1 545
nuclear@1 546 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@1 547 /* Initialize palette, background, etc, after transformations
nuclear@1 548 * are set, but before any reading takes place. This allows
nuclear@1 549 * the user to obtain a gamma-corrected palette, for example.
nuclear@1 550 * If the user doesn't call this, we will do it ourselves.
nuclear@1 551 */
nuclear@1 552 void PNGAPI
nuclear@1 553 png_start_read_image(png_structp png_ptr)
nuclear@1 554 {
nuclear@1 555 png_debug(1, "in png_start_read_image\n");
nuclear@1 556 if (png_ptr == NULL) return;
nuclear@1 557 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
nuclear@1 558 png_read_start_row(png_ptr);
nuclear@1 559 }
nuclear@1 560 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@1 561
nuclear@1 562 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@1 563 void PNGAPI
nuclear@1 564 png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
nuclear@1 565 {
nuclear@1 566 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@1 567 PNG_CONST PNG_IDAT;
nuclear@1 568 PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
nuclear@1 569 0xff};
nuclear@1 570 PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
nuclear@1 571 #endif
nuclear@1 572 int ret;
nuclear@1 573 if (png_ptr == NULL) return;
nuclear@1 574 png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
nuclear@1 575 png_ptr->row_number, png_ptr->pass);
nuclear@1 576 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
nuclear@1 577 png_read_start_row(png_ptr);
nuclear@1 578 if (png_ptr->row_number == 0 && png_ptr->pass == 0)
nuclear@1 579 {
nuclear@1 580 /* check for transforms that have been set but were defined out */
nuclear@1 581 #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
nuclear@1 582 if (png_ptr->transformations & PNG_INVERT_MONO)
nuclear@1 583 png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
nuclear@1 584 #endif
nuclear@1 585 #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
nuclear@1 586 if (png_ptr->transformations & PNG_FILLER)
nuclear@1 587 png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined.");
nuclear@1 588 #endif
nuclear@1 589 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@1 590 if (png_ptr->transformations & PNG_PACKSWAP)
nuclear@1 591 png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined.");
nuclear@1 592 #endif
nuclear@1 593 #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
nuclear@1 594 if (png_ptr->transformations & PNG_PACK)
nuclear@1 595 png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined.");
nuclear@1 596 #endif
nuclear@1 597 #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@1 598 if (png_ptr->transformations & PNG_SHIFT)
nuclear@1 599 png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined.");
nuclear@1 600 #endif
nuclear@1 601 #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
nuclear@1 602 if (png_ptr->transformations & PNG_BGR)
nuclear@1 603 png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined.");
nuclear@1 604 #endif
nuclear@1 605 #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
nuclear@1 606 if (png_ptr->transformations & PNG_SWAP_BYTES)
nuclear@1 607 png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined.");
nuclear@1 608 #endif
nuclear@1 609 }
nuclear@1 610
nuclear@1 611 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@1 612 /* if interlaced and we do not need a new row, combine row and return */
nuclear@1 613 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
nuclear@1 614 {
nuclear@1 615 switch (png_ptr->pass)
nuclear@1 616 {
nuclear@1 617 case 0:
nuclear@1 618 if (png_ptr->row_number & 0x07)
nuclear@1 619 {
nuclear@1 620 if (dsp_row != NULL)
nuclear@1 621 png_combine_row(png_ptr, dsp_row,
nuclear@1 622 png_pass_dsp_mask[png_ptr->pass]);
nuclear@1 623 png_read_finish_row(png_ptr);
nuclear@1 624 return;
nuclear@1 625 }
nuclear@1 626 break;
nuclear@1 627 case 1:
nuclear@1 628 if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
nuclear@1 629 {
nuclear@1 630 if (dsp_row != NULL)
nuclear@1 631 png_combine_row(png_ptr, dsp_row,
nuclear@1 632 png_pass_dsp_mask[png_ptr->pass]);
nuclear@1 633 png_read_finish_row(png_ptr);
nuclear@1 634 return;
nuclear@1 635 }
nuclear@1 636 break;
nuclear@1 637 case 2:
nuclear@1 638 if ((png_ptr->row_number & 0x07) != 4)
nuclear@1 639 {
nuclear@1 640 if (dsp_row != NULL && (png_ptr->row_number & 4))
nuclear@1 641 png_combine_row(png_ptr, dsp_row,
nuclear@1 642 png_pass_dsp_mask[png_ptr->pass]);
nuclear@1 643 png_read_finish_row(png_ptr);
nuclear@1 644 return;
nuclear@1 645 }
nuclear@1 646 break;
nuclear@1 647 case 3:
nuclear@1 648 if ((png_ptr->row_number & 3) || png_ptr->width < 3)
nuclear@1 649 {
nuclear@1 650 if (dsp_row != NULL)
nuclear@1 651 png_combine_row(png_ptr, dsp_row,
nuclear@1 652 png_pass_dsp_mask[png_ptr->pass]);
nuclear@1 653 png_read_finish_row(png_ptr);
nuclear@1 654 return;
nuclear@1 655 }
nuclear@1 656 break;
nuclear@1 657 case 4:
nuclear@1 658 if ((png_ptr->row_number & 3) != 2)
nuclear@1 659 {
nuclear@1 660 if (dsp_row != NULL && (png_ptr->row_number & 2))
nuclear@1 661 png_combine_row(png_ptr, dsp_row,
nuclear@1 662 png_pass_dsp_mask[png_ptr->pass]);
nuclear@1 663 png_read_finish_row(png_ptr);
nuclear@1 664 return;
nuclear@1 665 }
nuclear@1 666 break;
nuclear@1 667 case 5:
nuclear@1 668 if ((png_ptr->row_number & 1) || png_ptr->width < 2)
nuclear@1 669 {
nuclear@1 670 if (dsp_row != NULL)
nuclear@1 671 png_combine_row(png_ptr, dsp_row,
nuclear@1 672 png_pass_dsp_mask[png_ptr->pass]);
nuclear@1 673 png_read_finish_row(png_ptr);
nuclear@1 674 return;
nuclear@1 675 }
nuclear@1 676 break;
nuclear@1 677 case 6:
nuclear@1 678 if (!(png_ptr->row_number & 1))
nuclear@1 679 {
nuclear@1 680 png_read_finish_row(png_ptr);
nuclear@1 681 return;
nuclear@1 682 }
nuclear@1 683 break;
nuclear@1 684 }
nuclear@1 685 }
nuclear@1 686 #endif
nuclear@1 687
nuclear@1 688 if (!(png_ptr->mode & PNG_HAVE_IDAT))
nuclear@1 689 png_error(png_ptr, "Invalid attempt to read row data");
nuclear@1 690
nuclear@1 691 png_ptr->zstream.next_out = png_ptr->row_buf;
nuclear@1 692 png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
nuclear@1 693 do
nuclear@1 694 {
nuclear@1 695 if (!(png_ptr->zstream.avail_in))
nuclear@1 696 {
nuclear@1 697 while (!png_ptr->idat_size)
nuclear@1 698 {
nuclear@1 699 png_crc_finish(png_ptr, 0);
nuclear@1 700
nuclear@1 701 png_ptr->idat_size = png_read_chunk_header(png_ptr);
nuclear@1 702 if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@1 703 png_error(png_ptr, "Not enough image data");
nuclear@1 704 }
nuclear@1 705 png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
nuclear@1 706 png_ptr->zstream.next_in = png_ptr->zbuf;
nuclear@1 707 if (png_ptr->zbuf_size > png_ptr->idat_size)
nuclear@1 708 png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
nuclear@1 709 png_crc_read(png_ptr, png_ptr->zbuf,
nuclear@1 710 (png_size_t)png_ptr->zstream.avail_in);
nuclear@1 711 png_ptr->idat_size -= png_ptr->zstream.avail_in;
nuclear@1 712 }
nuclear@1 713 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
nuclear@1 714 if (ret == Z_STREAM_END)
nuclear@1 715 {
nuclear@1 716 if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||
nuclear@1 717 png_ptr->idat_size)
nuclear@1 718 png_error(png_ptr, "Extra compressed data");
nuclear@1 719 png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@1 720 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
nuclear@1 721 break;
nuclear@1 722 }
nuclear@1 723 if (ret != Z_OK)
nuclear@1 724 png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
nuclear@1 725 "Decompression error");
nuclear@1 726
nuclear@1 727 } while (png_ptr->zstream.avail_out);
nuclear@1 728
nuclear@1 729 png_ptr->row_info.color_type = png_ptr->color_type;
nuclear@1 730 png_ptr->row_info.width = png_ptr->iwidth;
nuclear@1 731 png_ptr->row_info.channels = png_ptr->channels;
nuclear@1 732 png_ptr->row_info.bit_depth = png_ptr->bit_depth;
nuclear@1 733 png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
nuclear@1 734 png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
nuclear@1 735 png_ptr->row_info.width);
nuclear@1 736
nuclear@1 737 if (png_ptr->row_buf[0])
nuclear@1 738 png_read_filter_row(png_ptr, &(png_ptr->row_info),
nuclear@1 739 png_ptr->row_buf + 1, png_ptr->prev_row + 1,
nuclear@1 740 (int)(png_ptr->row_buf[0]));
nuclear@1 741
nuclear@1 742 png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
nuclear@1 743 png_ptr->rowbytes + 1);
nuclear@1 744
nuclear@1 745 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@1 746 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
nuclear@1 747 (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
nuclear@1 748 {
nuclear@1 749 /* Intrapixel differencing */
nuclear@1 750 png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
nuclear@1 751 }
nuclear@1 752 #endif
nuclear@1 753
nuclear@1 754
nuclear@1 755 if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
nuclear@1 756 png_do_read_transformations(png_ptr);
nuclear@1 757
nuclear@1 758 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@1 759 /* blow up interlaced rows to full size */
nuclear@1 760 if (png_ptr->interlaced &&
nuclear@1 761 (png_ptr->transformations & PNG_INTERLACE))
nuclear@1 762 {
nuclear@1 763 if (png_ptr->pass < 6)
nuclear@1 764 /* old interface (pre-1.0.9):
nuclear@1 765 png_do_read_interlace(&(png_ptr->row_info),
nuclear@1 766 png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
nuclear@1 767 */
nuclear@1 768 png_do_read_interlace(png_ptr);
nuclear@1 769
nuclear@1 770 if (dsp_row != NULL)
nuclear@1 771 png_combine_row(png_ptr, dsp_row,
nuclear@1 772 png_pass_dsp_mask[png_ptr->pass]);
nuclear@1 773 if (row != NULL)
nuclear@1 774 png_combine_row(png_ptr, row,
nuclear@1 775 png_pass_mask[png_ptr->pass]);
nuclear@1 776 }
nuclear@1 777 else
nuclear@1 778 #endif
nuclear@1 779 {
nuclear@1 780 if (row != NULL)
nuclear@1 781 png_combine_row(png_ptr, row, 0xff);
nuclear@1 782 if (dsp_row != NULL)
nuclear@1 783 png_combine_row(png_ptr, dsp_row, 0xff);
nuclear@1 784 }
nuclear@1 785 png_read_finish_row(png_ptr);
nuclear@1 786
nuclear@1 787 if (png_ptr->read_row_fn != NULL)
nuclear@1 788 (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
nuclear@1 789 }
nuclear@1 790 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@1 791
nuclear@1 792 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@1 793 /* Read one or more rows of image data. If the image is interlaced,
nuclear@1 794 * and png_set_interlace_handling() has been called, the rows need to
nuclear@1 795 * contain the contents of the rows from the previous pass. If the
nuclear@1 796 * image has alpha or transparency, and png_handle_alpha()[*] has been
nuclear@1 797 * called, the rows contents must be initialized to the contents of the
nuclear@1 798 * screen.
nuclear@1 799 *
nuclear@1 800 * "row" holds the actual image, and pixels are placed in it
nuclear@1 801 * as they arrive. If the image is displayed after each pass, it will
nuclear@1 802 * appear to "sparkle" in. "display_row" can be used to display a
nuclear@1 803 * "chunky" progressive image, with finer detail added as it becomes
nuclear@1 804 * available. If you do not want this "chunky" display, you may pass
nuclear@1 805 * NULL for display_row. If you do not want the sparkle display, and
nuclear@1 806 * you have not called png_handle_alpha(), you may pass NULL for rows.
nuclear@1 807 * If you have called png_handle_alpha(), and the image has either an
nuclear@1 808 * alpha channel or a transparency chunk, you must provide a buffer for
nuclear@1 809 * rows. In this case, you do not have to provide a display_row buffer
nuclear@1 810 * also, but you may. If the image is not interlaced, or if you have
nuclear@1 811 * not called png_set_interlace_handling(), the display_row buffer will
nuclear@1 812 * be ignored, so pass NULL to it.
nuclear@1 813 *
nuclear@1 814 * [*] png_handle_alpha() does not exist yet, as of this version of libpng
nuclear@1 815 */
nuclear@1 816
nuclear@1 817 void PNGAPI
nuclear@1 818 png_read_rows(png_structp png_ptr, png_bytepp row,
nuclear@1 819 png_bytepp display_row, png_uint_32 num_rows)
nuclear@1 820 {
nuclear@1 821 png_uint_32 i;
nuclear@1 822 png_bytepp rp;
nuclear@1 823 png_bytepp dp;
nuclear@1 824
nuclear@1 825 png_debug(1, "in png_read_rows\n");
nuclear@1 826 if (png_ptr == NULL) return;
nuclear@1 827 rp = row;
nuclear@1 828 dp = display_row;
nuclear@1 829 if (rp != NULL && dp != NULL)
nuclear@1 830 for (i = 0; i < num_rows; i++)
nuclear@1 831 {
nuclear@1 832 png_bytep rptr = *rp++;
nuclear@1 833 png_bytep dptr = *dp++;
nuclear@1 834
nuclear@1 835 png_read_row(png_ptr, rptr, dptr);
nuclear@1 836 }
nuclear@1 837 else if (rp != NULL)
nuclear@1 838 for (i = 0; i < num_rows; i++)
nuclear@1 839 {
nuclear@1 840 png_bytep rptr = *rp;
nuclear@1 841 png_read_row(png_ptr, rptr, png_bytep_NULL);
nuclear@1 842 rp++;
nuclear@1 843 }
nuclear@1 844 else if (dp != NULL)
nuclear@1 845 for (i = 0; i < num_rows; i++)
nuclear@1 846 {
nuclear@1 847 png_bytep dptr = *dp;
nuclear@1 848 png_read_row(png_ptr, png_bytep_NULL, dptr);
nuclear@1 849 dp++;
nuclear@1 850 }
nuclear@1 851 }
nuclear@1 852 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@1 853
nuclear@1 854 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@1 855 /* Read the entire image. If the image has an alpha channel or a tRNS
nuclear@1 856 * chunk, and you have called png_handle_alpha()[*], you will need to
nuclear@1 857 * initialize the image to the current image that PNG will be overlaying.
nuclear@1 858 * We set the num_rows again here, in case it was incorrectly set in
nuclear@1 859 * png_read_start_row() by a call to png_read_update_info() or
nuclear@1 860 * png_start_read_image() if png_set_interlace_handling() wasn't called
nuclear@1 861 * prior to either of these functions like it should have been. You can
nuclear@1 862 * only call this function once. If you desire to have an image for
nuclear@1 863 * each pass of a interlaced image, use png_read_rows() instead.
nuclear@1 864 *
nuclear@1 865 * [*] png_handle_alpha() does not exist yet, as of this version of libpng
nuclear@1 866 */
nuclear@1 867 void PNGAPI
nuclear@1 868 png_read_image(png_structp png_ptr, png_bytepp image)
nuclear@1 869 {
nuclear@1 870 png_uint_32 i, image_height;
nuclear@1 871 int pass, j;
nuclear@1 872 png_bytepp rp;
nuclear@1 873
nuclear@1 874 png_debug(1, "in png_read_image\n");
nuclear@1 875 if (png_ptr == NULL) return;
nuclear@1 876
nuclear@1 877 #ifdef PNG_READ_INTERLACING_SUPPORTED
nuclear@1 878 pass = png_set_interlace_handling(png_ptr);
nuclear@1 879 #else
nuclear@1 880 if (png_ptr->interlaced)
nuclear@1 881 png_error(png_ptr,
nuclear@1 882 "Cannot read interlaced image -- interlace handler disabled.");
nuclear@1 883 pass = 1;
nuclear@1 884 #endif
nuclear@1 885
nuclear@1 886
nuclear@1 887 image_height=png_ptr->height;
nuclear@1 888 png_ptr->num_rows = image_height; /* Make sure this is set correctly */
nuclear@1 889
nuclear@1 890 for (j = 0; j < pass; j++)
nuclear@1 891 {
nuclear@1 892 rp = image;
nuclear@1 893 for (i = 0; i < image_height; i++)
nuclear@1 894 {
nuclear@1 895 png_read_row(png_ptr, *rp, png_bytep_NULL);
nuclear@1 896 rp++;
nuclear@1 897 }
nuclear@1 898 }
nuclear@1 899 }
nuclear@1 900 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@1 901
nuclear@1 902 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@1 903 /* Read the end of the PNG file. Will not read past the end of the
nuclear@1 904 * file, will verify the end is accurate, and will read any comments
nuclear@1 905 * or time information at the end of the file, if info is not NULL.
nuclear@1 906 */
nuclear@1 907 void PNGAPI
nuclear@1 908 png_read_end(png_structp png_ptr, png_infop info_ptr)
nuclear@1 909 {
nuclear@1 910 png_debug(1, "in png_read_end\n");
nuclear@1 911 if (png_ptr == NULL) return;
nuclear@1 912 png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
nuclear@1 913
nuclear@1 914 do
nuclear@1 915 {
nuclear@1 916 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@1 917 PNG_CONST PNG_IHDR;
nuclear@1 918 PNG_CONST PNG_IDAT;
nuclear@1 919 PNG_CONST PNG_IEND;
nuclear@1 920 PNG_CONST PNG_PLTE;
nuclear@1 921 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@1 922 PNG_CONST PNG_bKGD;
nuclear@1 923 #endif
nuclear@1 924 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@1 925 PNG_CONST PNG_cHRM;
nuclear@1 926 #endif
nuclear@1 927 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@1 928 PNG_CONST PNG_gAMA;
nuclear@1 929 #endif
nuclear@1 930 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@1 931 PNG_CONST PNG_hIST;
nuclear@1 932 #endif
nuclear@1 933 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@1 934 PNG_CONST PNG_iCCP;
nuclear@1 935 #endif
nuclear@1 936 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@1 937 PNG_CONST PNG_iTXt;
nuclear@1 938 #endif
nuclear@1 939 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@1 940 PNG_CONST PNG_oFFs;
nuclear@1 941 #endif
nuclear@1 942 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@1 943 PNG_CONST PNG_pCAL;
nuclear@1 944 #endif
nuclear@1 945 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@1 946 PNG_CONST PNG_pHYs;
nuclear@1 947 #endif
nuclear@1 948 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@1 949 PNG_CONST PNG_sBIT;
nuclear@1 950 #endif
nuclear@1 951 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@1 952 PNG_CONST PNG_sCAL;
nuclear@1 953 #endif
nuclear@1 954 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@1 955 PNG_CONST PNG_sPLT;
nuclear@1 956 #endif
nuclear@1 957 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@1 958 PNG_CONST PNG_sRGB;
nuclear@1 959 #endif
nuclear@1 960 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@1 961 PNG_CONST PNG_tEXt;
nuclear@1 962 #endif
nuclear@1 963 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@1 964 PNG_CONST PNG_tIME;
nuclear@1 965 #endif
nuclear@1 966 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@1 967 PNG_CONST PNG_tRNS;
nuclear@1 968 #endif
nuclear@1 969 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@1 970 PNG_CONST PNG_zTXt;
nuclear@1 971 #endif
nuclear@1 972 #endif /* PNG_USE_LOCAL_ARRAYS */
nuclear@1 973 png_uint_32 length = png_read_chunk_header(png_ptr);
nuclear@1 974 PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
nuclear@1 975
nuclear@1 976 if (!png_memcmp(chunk_name, png_IHDR, 4))
nuclear@1 977 png_handle_IHDR(png_ptr, info_ptr, length);
nuclear@1 978 else if (!png_memcmp(chunk_name, png_IEND, 4))
nuclear@1 979 png_handle_IEND(png_ptr, info_ptr, length);
nuclear@1 980 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@1 981 else if (png_handle_as_unknown(png_ptr, chunk_name))
nuclear@1 982 {
nuclear@1 983 if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@1 984 {
nuclear@1 985 if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
nuclear@1 986 png_error(png_ptr, "Too many IDAT's found");
nuclear@1 987 }
nuclear@1 988 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@1 989 if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@1 990 png_ptr->mode |= PNG_HAVE_PLTE;
nuclear@1 991 }
nuclear@1 992 #endif
nuclear@1 993 else if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@1 994 {
nuclear@1 995 /* Zero length IDATs are legal after the last IDAT has been
nuclear@1 996 * read, but not after other chunks have been read.
nuclear@1 997 */
nuclear@1 998 if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
nuclear@1 999 png_error(png_ptr, "Too many IDAT's found");
nuclear@1 1000 png_crc_finish(png_ptr, length);
nuclear@1 1001 }
nuclear@1 1002 else if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@1 1003 png_handle_PLTE(png_ptr, info_ptr, length);
nuclear@1 1004 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@1 1005 else if (!png_memcmp(chunk_name, png_bKGD, 4))
nuclear@1 1006 png_handle_bKGD(png_ptr, info_ptr, length);
nuclear@1 1007 #endif
nuclear@1 1008 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@1 1009 else if (!png_memcmp(chunk_name, png_cHRM, 4))
nuclear@1 1010 png_handle_cHRM(png_ptr, info_ptr, length);
nuclear@1 1011 #endif
nuclear@1 1012 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@1 1013 else if (!png_memcmp(chunk_name, png_gAMA, 4))
nuclear@1 1014 png_handle_gAMA(png_ptr, info_ptr, length);
nuclear@1 1015 #endif
nuclear@1 1016 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@1 1017 else if (!png_memcmp(chunk_name, png_hIST, 4))
nuclear@1 1018 png_handle_hIST(png_ptr, info_ptr, length);
nuclear@1 1019 #endif
nuclear@1 1020 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@1 1021 else if (!png_memcmp(chunk_name, png_oFFs, 4))
nuclear@1 1022 png_handle_oFFs(png_ptr, info_ptr, length);
nuclear@1 1023 #endif
nuclear@1 1024 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@1 1025 else if (!png_memcmp(chunk_name, png_pCAL, 4))
nuclear@1 1026 png_handle_pCAL(png_ptr, info_ptr, length);
nuclear@1 1027 #endif
nuclear@1 1028 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@1 1029 else if (!png_memcmp(chunk_name, png_sCAL, 4))
nuclear@1 1030 png_handle_sCAL(png_ptr, info_ptr, length);
nuclear@1 1031 #endif
nuclear@1 1032 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@1 1033 else if (!png_memcmp(chunk_name, png_pHYs, 4))
nuclear@1 1034 png_handle_pHYs(png_ptr, info_ptr, length);
nuclear@1 1035 #endif
nuclear@1 1036 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@1 1037 else if (!png_memcmp(chunk_name, png_sBIT, 4))
nuclear@1 1038 png_handle_sBIT(png_ptr, info_ptr, length);
nuclear@1 1039 #endif
nuclear@1 1040 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@1 1041 else if (!png_memcmp(chunk_name, png_sRGB, 4))
nuclear@1 1042 png_handle_sRGB(png_ptr, info_ptr, length);
nuclear@1 1043 #endif
nuclear@1 1044 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@1 1045 else if (!png_memcmp(chunk_name, png_iCCP, 4))
nuclear@1 1046 png_handle_iCCP(png_ptr, info_ptr, length);
nuclear@1 1047 #endif
nuclear@1 1048 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@1 1049 else if (!png_memcmp(chunk_name, png_sPLT, 4))
nuclear@1 1050 png_handle_sPLT(png_ptr, info_ptr, length);
nuclear@1 1051 #endif
nuclear@1 1052 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@1 1053 else if (!png_memcmp(chunk_name, png_tEXt, 4))
nuclear@1 1054 png_handle_tEXt(png_ptr, info_ptr, length);
nuclear@1 1055 #endif
nuclear@1 1056 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@1 1057 else if (!png_memcmp(chunk_name, png_tIME, 4))
nuclear@1 1058 png_handle_tIME(png_ptr, info_ptr, length);
nuclear@1 1059 #endif
nuclear@1 1060 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@1 1061 else if (!png_memcmp(chunk_name, png_tRNS, 4))
nuclear@1 1062 png_handle_tRNS(png_ptr, info_ptr, length);
nuclear@1 1063 #endif
nuclear@1 1064 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@1 1065 else if (!png_memcmp(chunk_name, png_zTXt, 4))
nuclear@1 1066 png_handle_zTXt(png_ptr, info_ptr, length);
nuclear@1 1067 #endif
nuclear@1 1068 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@1 1069 else if (!png_memcmp(chunk_name, png_iTXt, 4))
nuclear@1 1070 png_handle_iTXt(png_ptr, info_ptr, length);
nuclear@1 1071 #endif
nuclear@1 1072 else
nuclear@1 1073 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@1 1074 } while (!(png_ptr->mode & PNG_HAVE_IEND));
nuclear@1 1075 }
nuclear@1 1076 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@1 1077
nuclear@1 1078 /* free all memory used by the read */
nuclear@1 1079 void PNGAPI
nuclear@1 1080 png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
nuclear@1 1081 png_infopp end_info_ptr_ptr)
nuclear@1 1082 {
nuclear@1 1083 png_structp png_ptr = NULL;
nuclear@1 1084 png_infop info_ptr = NULL, end_info_ptr = NULL;
nuclear@1 1085 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 1086 png_free_ptr free_fn = NULL;
nuclear@1 1087 png_voidp mem_ptr = NULL;
nuclear@1 1088 #endif
nuclear@1 1089
nuclear@1 1090 png_debug(1, "in png_destroy_read_struct\n");
nuclear@1 1091 if (png_ptr_ptr != NULL)
nuclear@1 1092 png_ptr = *png_ptr_ptr;
nuclear@1 1093 if (png_ptr == NULL)
nuclear@1 1094 return;
nuclear@1 1095
nuclear@1 1096 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 1097 free_fn = png_ptr->free_fn;
nuclear@1 1098 mem_ptr = png_ptr->mem_ptr;
nuclear@1 1099 #endif
nuclear@1 1100
nuclear@1 1101 if (info_ptr_ptr != NULL)
nuclear@1 1102 info_ptr = *info_ptr_ptr;
nuclear@1 1103
nuclear@1 1104 if (end_info_ptr_ptr != NULL)
nuclear@1 1105 end_info_ptr = *end_info_ptr_ptr;
nuclear@1 1106
nuclear@1 1107 png_read_destroy(png_ptr, info_ptr, end_info_ptr);
nuclear@1 1108
nuclear@1 1109 if (info_ptr != NULL)
nuclear@1 1110 {
nuclear@1 1111 #if defined(PNG_TEXT_SUPPORTED)
nuclear@1 1112 png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
nuclear@1 1113 #endif
nuclear@1 1114
nuclear@1 1115 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 1116 png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
nuclear@1 1117 (png_voidp)mem_ptr);
nuclear@1 1118 #else
nuclear@1 1119 png_destroy_struct((png_voidp)info_ptr);
nuclear@1 1120 #endif
nuclear@1 1121 *info_ptr_ptr = NULL;
nuclear@1 1122 }
nuclear@1 1123
nuclear@1 1124 if (end_info_ptr != NULL)
nuclear@1 1125 {
nuclear@1 1126 #if defined(PNG_READ_TEXT_SUPPORTED)
nuclear@1 1127 png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
nuclear@1 1128 #endif
nuclear@1 1129 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 1130 png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn,
nuclear@1 1131 (png_voidp)mem_ptr);
nuclear@1 1132 #else
nuclear@1 1133 png_destroy_struct((png_voidp)end_info_ptr);
nuclear@1 1134 #endif
nuclear@1 1135 *end_info_ptr_ptr = NULL;
nuclear@1 1136 }
nuclear@1 1137
nuclear@1 1138 if (png_ptr != NULL)
nuclear@1 1139 {
nuclear@1 1140 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 1141 png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
nuclear@1 1142 (png_voidp)mem_ptr);
nuclear@1 1143 #else
nuclear@1 1144 png_destroy_struct((png_voidp)png_ptr);
nuclear@1 1145 #endif
nuclear@1 1146 *png_ptr_ptr = NULL;
nuclear@1 1147 }
nuclear@1 1148 }
nuclear@1 1149
nuclear@1 1150 /* free all memory used by the read (old method) */
nuclear@1 1151 void /* PRIVATE */
nuclear@1 1152 png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
nuclear@1 1153 {
nuclear@1 1154 #ifdef PNG_SETJMP_SUPPORTED
nuclear@1 1155 jmp_buf tmp_jmp;
nuclear@1 1156 #endif
nuclear@1 1157 png_error_ptr error_fn;
nuclear@1 1158 png_error_ptr warning_fn;
nuclear@1 1159 png_voidp error_ptr;
nuclear@1 1160 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 1161 png_free_ptr free_fn;
nuclear@1 1162 #endif
nuclear@1 1163
nuclear@1 1164 png_debug(1, "in png_read_destroy\n");
nuclear@1 1165 if (info_ptr != NULL)
nuclear@1 1166 png_info_destroy(png_ptr, info_ptr);
nuclear@1 1167
nuclear@1 1168 if (end_info_ptr != NULL)
nuclear@1 1169 png_info_destroy(png_ptr, end_info_ptr);
nuclear@1 1170
nuclear@1 1171 png_free(png_ptr, png_ptr->zbuf);
nuclear@1 1172 png_free(png_ptr, png_ptr->big_row_buf);
nuclear@1 1173 png_free(png_ptr, png_ptr->prev_row);
nuclear@1 1174 png_free(png_ptr, png_ptr->chunkdata);
nuclear@1 1175 #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@1 1176 png_free(png_ptr, png_ptr->palette_lookup);
nuclear@1 1177 png_free(png_ptr, png_ptr->dither_index);
nuclear@1 1178 #endif
nuclear@1 1179 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@1 1180 png_free(png_ptr, png_ptr->gamma_table);
nuclear@1 1181 #endif
nuclear@1 1182 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@1 1183 png_free(png_ptr, png_ptr->gamma_from_1);
nuclear@1 1184 png_free(png_ptr, png_ptr->gamma_to_1);
nuclear@1 1185 #endif
nuclear@1 1186 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@1 1187 if (png_ptr->free_me & PNG_FREE_PLTE)
nuclear@1 1188 png_zfree(png_ptr, png_ptr->palette);
nuclear@1 1189 png_ptr->free_me &= ~PNG_FREE_PLTE;
nuclear@1 1190 #else
nuclear@1 1191 if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
nuclear@1 1192 png_zfree(png_ptr, png_ptr->palette);
nuclear@1 1193 png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
nuclear@1 1194 #endif
nuclear@1 1195 #if defined(PNG_tRNS_SUPPORTED) || \
nuclear@1 1196 defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@1 1197 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@1 1198 if (png_ptr->free_me & PNG_FREE_TRNS)
nuclear@1 1199 png_free(png_ptr, png_ptr->trans);
nuclear@1 1200 png_ptr->free_me &= ~PNG_FREE_TRNS;
nuclear@1 1201 #else
nuclear@1 1202 if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
nuclear@1 1203 png_free(png_ptr, png_ptr->trans);
nuclear@1 1204 png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
nuclear@1 1205 #endif
nuclear@1 1206 #endif
nuclear@1 1207 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@1 1208 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@1 1209 if (png_ptr->free_me & PNG_FREE_HIST)
nuclear@1 1210 png_free(png_ptr, png_ptr->hist);
nuclear@1 1211 png_ptr->free_me &= ~PNG_FREE_HIST;
nuclear@1 1212 #else
nuclear@1 1213 if (png_ptr->flags & PNG_FLAG_FREE_HIST)
nuclear@1 1214 png_free(png_ptr, png_ptr->hist);
nuclear@1 1215 png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
nuclear@1 1216 #endif
nuclear@1 1217 #endif
nuclear@1 1218 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@1 1219 if (png_ptr->gamma_16_table != NULL)
nuclear@1 1220 {
nuclear@1 1221 int i;
nuclear@1 1222 int istop = (1 << (8 - png_ptr->gamma_shift));
nuclear@1 1223 for (i = 0; i < istop; i++)
nuclear@1 1224 {
nuclear@1 1225 png_free(png_ptr, png_ptr->gamma_16_table[i]);
nuclear@1 1226 }
nuclear@1 1227 png_free(png_ptr, png_ptr->gamma_16_table);
nuclear@1 1228 }
nuclear@1 1229 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@1 1230 if (png_ptr->gamma_16_from_1 != NULL)
nuclear@1 1231 {
nuclear@1 1232 int i;
nuclear@1 1233 int istop = (1 << (8 - png_ptr->gamma_shift));
nuclear@1 1234 for (i = 0; i < istop; i++)
nuclear@1 1235 {
nuclear@1 1236 png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
nuclear@1 1237 }
nuclear@1 1238 png_free(png_ptr, png_ptr->gamma_16_from_1);
nuclear@1 1239 }
nuclear@1 1240 if (png_ptr->gamma_16_to_1 != NULL)
nuclear@1 1241 {
nuclear@1 1242 int i;
nuclear@1 1243 int istop = (1 << (8 - png_ptr->gamma_shift));
nuclear@1 1244 for (i = 0; i < istop; i++)
nuclear@1 1245 {
nuclear@1 1246 png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
nuclear@1 1247 }
nuclear@1 1248 png_free(png_ptr, png_ptr->gamma_16_to_1);
nuclear@1 1249 }
nuclear@1 1250 #endif
nuclear@1 1251 #endif
nuclear@1 1252 #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@1 1253 png_free(png_ptr, png_ptr->time_buffer);
nuclear@1 1254 #endif
nuclear@1 1255
nuclear@1 1256 inflateEnd(&png_ptr->zstream);
nuclear@1 1257 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@1 1258 png_free(png_ptr, png_ptr->save_buffer);
nuclear@1 1259 #endif
nuclear@1 1260
nuclear@1 1261 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@1 1262 #ifdef PNG_TEXT_SUPPORTED
nuclear@1 1263 png_free(png_ptr, png_ptr->current_text);
nuclear@1 1264 #endif /* PNG_TEXT_SUPPORTED */
nuclear@1 1265 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
nuclear@1 1266
nuclear@1 1267 /* Save the important info out of the png_struct, in case it is
nuclear@1 1268 * being used again.
nuclear@1 1269 */
nuclear@1 1270 #ifdef PNG_SETJMP_SUPPORTED
nuclear@1 1271 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@1 1272 #endif
nuclear@1 1273
nuclear@1 1274 error_fn = png_ptr->error_fn;
nuclear@1 1275 warning_fn = png_ptr->warning_fn;
nuclear@1 1276 error_ptr = png_ptr->error_ptr;
nuclear@1 1277 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 1278 free_fn = png_ptr->free_fn;
nuclear@1 1279 #endif
nuclear@1 1280
nuclear@1 1281 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@1 1282
nuclear@1 1283 png_ptr->error_fn = error_fn;
nuclear@1 1284 png_ptr->warning_fn = warning_fn;
nuclear@1 1285 png_ptr->error_ptr = error_ptr;
nuclear@1 1286 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 1287 png_ptr->free_fn = free_fn;
nuclear@1 1288 #endif
nuclear@1 1289
nuclear@1 1290 #ifdef PNG_SETJMP_SUPPORTED
nuclear@1 1291 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@1 1292 #endif
nuclear@1 1293
nuclear@1 1294 }
nuclear@1 1295
nuclear@1 1296 void PNGAPI
nuclear@1 1297 png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
nuclear@1 1298 {
nuclear@1 1299 if (png_ptr == NULL) return;
nuclear@1 1300 png_ptr->read_row_fn = read_row_fn;
nuclear@1 1301 }
nuclear@1 1302
nuclear@1 1303
nuclear@1 1304 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@1 1305 #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@1 1306 void PNGAPI
nuclear@1 1307 png_read_png(png_structp png_ptr, png_infop info_ptr,
nuclear@1 1308 int transforms,
nuclear@1 1309 voidp params)
nuclear@1 1310 {
nuclear@1 1311 int row;
nuclear@1 1312
nuclear@1 1313 if (png_ptr == NULL) return;
nuclear@1 1314 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
nuclear@1 1315 /* invert the alpha channel from opacity to transparency
nuclear@1 1316 */
nuclear@1 1317 if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
nuclear@1 1318 png_set_invert_alpha(png_ptr);
nuclear@1 1319 #endif
nuclear@1 1320
nuclear@1 1321 /* png_read_info() gives us all of the information from the
nuclear@1 1322 * PNG file before the first IDAT (image data chunk).
nuclear@1 1323 */
nuclear@1 1324 png_read_info(png_ptr, info_ptr);
nuclear@1 1325 if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
nuclear@1 1326 png_error(png_ptr, "Image is too high to process with png_read_png()");
nuclear@1 1327
nuclear@1 1328 /* -------------- image transformations start here ------------------- */
nuclear@1 1329
nuclear@1 1330 #if defined(PNG_READ_16_TO_8_SUPPORTED)
nuclear@1 1331 /* tell libpng to strip 16 bit/color files down to 8 bits per color
nuclear@1 1332 */
nuclear@1 1333 if (transforms & PNG_TRANSFORM_STRIP_16)
nuclear@1 1334 png_set_strip_16(png_ptr);
nuclear@1 1335 #endif
nuclear@1 1336
nuclear@1 1337 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
nuclear@1 1338 /* Strip alpha bytes from the input data without combining with
nuclear@1 1339 * the background (not recommended).
nuclear@1 1340 */
nuclear@1 1341 if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
nuclear@1 1342 png_set_strip_alpha(png_ptr);
nuclear@1 1343 #endif
nuclear@1 1344
nuclear@1 1345 #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@1 1346 /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single
nuclear@1 1347 * byte into separate bytes (useful for paletted and grayscale images).
nuclear@1 1348 */
nuclear@1 1349 if (transforms & PNG_TRANSFORM_PACKING)
nuclear@1 1350 png_set_packing(png_ptr);
nuclear@1 1351 #endif
nuclear@1 1352
nuclear@1 1353 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@1 1354 /* Change the order of packed pixels to least significant bit first
nuclear@1 1355 * (not useful if you are using png_set_packing).
nuclear@1 1356 */
nuclear@1 1357 if (transforms & PNG_TRANSFORM_PACKSWAP)
nuclear@1 1358 png_set_packswap(png_ptr);
nuclear@1 1359 #endif
nuclear@1 1360
nuclear@1 1361 #if defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@1 1362 /* Expand paletted colors into true RGB triplets
nuclear@1 1363 * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
nuclear@1 1364 * Expand paletted or RGB images with transparency to full alpha
nuclear@1 1365 * channels so the data will be available as RGBA quartets.
nuclear@1 1366 */
nuclear@1 1367 if (transforms & PNG_TRANSFORM_EXPAND)
nuclear@1 1368 if ((png_ptr->bit_depth < 8) ||
nuclear@1 1369 (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
nuclear@1 1370 (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
nuclear@1 1371 png_set_expand(png_ptr);
nuclear@1 1372 #endif
nuclear@1 1373
nuclear@1 1374 /* We don't handle background color or gamma transformation or dithering.
nuclear@1 1375 */
nuclear@1 1376
nuclear@1 1377 #if defined(PNG_READ_INVERT_SUPPORTED)
nuclear@1 1378 /* invert monochrome files to have 0 as white and 1 as black
nuclear@1 1379 */
nuclear@1 1380 if (transforms & PNG_TRANSFORM_INVERT_MONO)
nuclear@1 1381 png_set_invert_mono(png_ptr);
nuclear@1 1382 #endif
nuclear@1 1383
nuclear@1 1384 #if defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@1 1385 /* If you want to shift the pixel values from the range [0,255] or
nuclear@1 1386 * [0,65535] to the original [0,7] or [0,31], or whatever range the
nuclear@1 1387 * colors were originally in:
nuclear@1 1388 */
nuclear@1 1389 if ((transforms & PNG_TRANSFORM_SHIFT)
nuclear@1 1390 && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
nuclear@1 1391 {
nuclear@1 1392 png_color_8p sig_bit;
nuclear@1 1393
nuclear@1 1394 png_get_sBIT(png_ptr, info_ptr, &sig_bit);
nuclear@1 1395 png_set_shift(png_ptr, sig_bit);
nuclear@1 1396 }
nuclear@1 1397 #endif
nuclear@1 1398
nuclear@1 1399 #if defined(PNG_READ_BGR_SUPPORTED)
nuclear@1 1400 /* flip the RGB pixels to BGR (or RGBA to BGRA)
nuclear@1 1401 */
nuclear@1 1402 if (transforms & PNG_TRANSFORM_BGR)
nuclear@1 1403 png_set_bgr(png_ptr);
nuclear@1 1404 #endif
nuclear@1 1405
nuclear@1 1406 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
nuclear@1 1407 /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
nuclear@1 1408 */
nuclear@1 1409 if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
nuclear@1 1410 png_set_swap_alpha(png_ptr);
nuclear@1 1411 #endif
nuclear@1 1412
nuclear@1 1413 #if defined(PNG_READ_SWAP_SUPPORTED)
nuclear@1 1414 /* swap bytes of 16 bit files to least significant byte first
nuclear@1 1415 */
nuclear@1 1416 if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
nuclear@1 1417 png_set_swap(png_ptr);
nuclear@1 1418 #endif
nuclear@1 1419
nuclear@1 1420 /* We don't handle adding filler bytes */
nuclear@1 1421
nuclear@1 1422 /* Optional call to gamma correct and add the background to the palette
nuclear@1 1423 * and update info structure. REQUIRED if you are expecting libpng to
nuclear@1 1424 * update the palette for you (i.e., you selected such a transform above).
nuclear@1 1425 */
nuclear@1 1426 png_read_update_info(png_ptr, info_ptr);
nuclear@1 1427
nuclear@1 1428 /* -------------- image transformations end here ------------------- */
nuclear@1 1429
nuclear@1 1430 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@1 1431 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
nuclear@1 1432 #endif
nuclear@1 1433 if (info_ptr->row_pointers == NULL)
nuclear@1 1434 {
nuclear@1 1435 info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
nuclear@1 1436 info_ptr->height * png_sizeof(png_bytep));
nuclear@1 1437 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@1 1438 info_ptr->free_me |= PNG_FREE_ROWS;
nuclear@1 1439 #endif
nuclear@1 1440 for (row = 0; row < (int)info_ptr->height; row++)
nuclear@1 1441 {
nuclear@1 1442 info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
nuclear@1 1443 png_get_rowbytes(png_ptr, info_ptr));
nuclear@1 1444 }
nuclear@1 1445 }
nuclear@1 1446
nuclear@1 1447 png_read_image(png_ptr, info_ptr->row_pointers);
nuclear@1 1448 info_ptr->valid |= PNG_INFO_IDAT;
nuclear@1 1449
nuclear@1 1450 /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
nuclear@1 1451 png_read_end(png_ptr, info_ptr);
nuclear@1 1452
nuclear@1 1453 transforms = transforms; /* quiet compiler warnings */
nuclear@1 1454 params = params;
nuclear@1 1455
nuclear@1 1456 }
nuclear@1 1457 #endif /* PNG_INFO_IMAGE_SUPPORTED */
nuclear@1 1458 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@1 1459 #endif /* PNG_READ_SUPPORTED */