J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 3 | * |
| 4 | * This code is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License version 2 only, as |
| 6 | * published by the Free Software Foundation. Sun designates this |
| 7 | * particular file as subject to the "Classpath" exception as provided |
| 8 | * by Sun in the LICENSE file that accompanied this code. |
| 9 | * |
| 10 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 13 | * version 2 for more details (a copy is included in the LICENSE file that |
| 14 | * accompanied this code). |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License version |
| 17 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 18 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | * |
| 20 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 21 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 22 | * have any questions. |
| 23 | */ |
| 24 | |
| 25 | /* png.c - location for general purpose libpng functions |
| 26 | * |
| 27 | * This file is available under and governed by the GNU General Public |
| 28 | * License version 2 only, as published by the Free Software Foundation. |
| 29 | * However, the following notice accompanied the original version of this |
| 30 | * file and, per its terms, should not be removed: |
| 31 | * |
| 32 | * Last changed in libpng 1.2.17 May 15, 2007 |
| 33 | * For conditions of distribution and use, see copyright notice in png.h |
| 34 | * Copyright (c) 1998-2007 Glenn Randers-Pehrson |
| 35 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 36 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| 37 | */ |
| 38 | |
| 39 | #define PNG_INTERNAL |
| 40 | #define PNG_NO_EXTERN |
| 41 | #include "png.h" |
| 42 | |
| 43 | /* Generate a compiler error if there is an old png.h in the search path. */ |
| 44 | typedef version_1_2_18 Your_png_h_is_not_version_1_2_18; |
| 45 | |
| 46 | /* Version information for C files. This had better match the version |
| 47 | * string defined in png.h. */ |
| 48 | |
| 49 | #ifdef PNG_USE_GLOBAL_ARRAYS |
| 50 | /* png_libpng_ver was changed to a function in version 1.0.5c */ |
| 51 | const char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING; |
| 52 | |
| 53 | #ifdef PNG_READ_SUPPORTED |
| 54 | |
| 55 | /* png_sig was changed to a function in version 1.0.5c */ |
| 56 | /* Place to hold the signature string for a PNG file. */ |
| 57 | const png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; |
| 58 | #endif /* PNG_READ_SUPPORTED */ |
| 59 | |
| 60 | /* Invoke global declarations for constant strings for known chunk types */ |
| 61 | PNG_IHDR; |
| 62 | PNG_IDAT; |
| 63 | PNG_IEND; |
| 64 | PNG_PLTE; |
| 65 | PNG_bKGD; |
| 66 | PNG_cHRM; |
| 67 | PNG_gAMA; |
| 68 | PNG_hIST; |
| 69 | PNG_iCCP; |
| 70 | PNG_iTXt; |
| 71 | PNG_oFFs; |
| 72 | PNG_pCAL; |
| 73 | PNG_sCAL; |
| 74 | PNG_pHYs; |
| 75 | PNG_sBIT; |
| 76 | PNG_sPLT; |
| 77 | PNG_sRGB; |
| 78 | PNG_tEXt; |
| 79 | PNG_tIME; |
| 80 | PNG_tRNS; |
| 81 | PNG_zTXt; |
| 82 | |
| 83 | #ifdef PNG_READ_SUPPORTED |
| 84 | /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
| 85 | |
| 86 | /* start of interlace block */ |
| 87 | const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; |
| 88 | |
| 89 | /* offset to next interlace block */ |
| 90 | const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; |
| 91 | |
| 92 | /* start of interlace block in the y direction */ |
| 93 | const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; |
| 94 | |
| 95 | /* offset to next interlace block in the y direction */ |
| 96 | const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; |
| 97 | |
| 98 | /* width of interlace block (used in assembler routines only) */ |
| 99 | #ifdef PNG_HAVE_MMX_COMBINE_ROW |
| 100 | const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1}; |
| 101 | #endif |
| 102 | |
| 103 | /* Height of interlace block. This is not currently used - if you need |
| 104 | * it, uncomment it here and in png.h |
| 105 | const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; |
| 106 | */ |
| 107 | |
| 108 | /* Mask to determine which pixels are valid in a pass */ |
| 109 | const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; |
| 110 | |
| 111 | /* Mask to determine which pixels to overwrite while displaying */ |
| 112 | const int FARDATA png_pass_dsp_mask[] |
| 113 | = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; |
| 114 | |
| 115 | #endif /* PNG_READ_SUPPORTED */ |
| 116 | #endif /* PNG_USE_GLOBAL_ARRAYS */ |
| 117 | |
| 118 | /* Tells libpng that we have already handled the first "num_bytes" bytes |
| 119 | * of the PNG file signature. If the PNG data is embedded into another |
| 120 | * stream we can set num_bytes = 8 so that libpng will not attempt to read |
| 121 | * or write any of the magic bytes before it starts on the IHDR. |
| 122 | */ |
| 123 | |
| 124 | #ifdef PNG_READ_SUPPORTED |
| 125 | void PNGAPI |
| 126 | png_set_sig_bytes(png_structp png_ptr, int num_bytes) |
| 127 | { |
| 128 | if(png_ptr == NULL) return; |
| 129 | png_debug(1, "in png_set_sig_bytes\n"); |
| 130 | if (num_bytes > 8) |
| 131 | png_error(png_ptr, "Too many bytes for PNG signature."); |
| 132 | |
| 133 | png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes); |
| 134 | } |
| 135 | |
| 136 | /* Checks whether the supplied bytes match the PNG signature. We allow |
| 137 | * checking less than the full 8-byte signature so that those apps that |
| 138 | * already read the first few bytes of a file to determine the file type |
| 139 | * can simply check the remaining bytes for extra assurance. Returns |
| 140 | * an integer less than, equal to, or greater than zero if sig is found, |
| 141 | * respectively, to be less than, to match, or be greater than the correct |
| 142 | * PNG signature (this is the same behaviour as strcmp, memcmp, etc). |
| 143 | */ |
| 144 | int PNGAPI |
| 145 | png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check) |
| 146 | { |
| 147 | png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; |
| 148 | if (num_to_check > 8) |
| 149 | num_to_check = 8; |
| 150 | else if (num_to_check < 1) |
| 151 | return (-1); |
| 152 | |
| 153 | if (start > 7) |
| 154 | return (-1); |
| 155 | |
| 156 | if (start + num_to_check > 8) |
| 157 | num_to_check = 8 - start; |
| 158 | |
| 159 | return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check))); |
| 160 | } |
| 161 | |
| 162 | #if defined(PNG_1_0_X) || defined(PNG_1_2_X) |
| 163 | /* (Obsolete) function to check signature bytes. It does not allow one |
| 164 | * to check a partial signature. This function might be removed in the |
| 165 | * future - use png_sig_cmp(). Returns true (nonzero) if the file is a PNG. |
| 166 | */ |
| 167 | int PNGAPI |
| 168 | png_check_sig(png_bytep sig, int num) |
| 169 | { |
| 170 | return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num)); |
| 171 | } |
| 172 | #endif |
| 173 | #endif /* PNG_READ_SUPPORTED */ |
| 174 | |
| 175 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| 176 | /* Function to allocate memory for zlib and clear it to 0. */ |
| 177 | #ifdef PNG_1_0_X |
| 178 | voidpf PNGAPI |
| 179 | #else |
| 180 | voidpf /* private */ |
| 181 | #endif |
| 182 | png_zalloc(voidpf png_ptr, uInt items, uInt size) |
| 183 | { |
| 184 | png_voidp ptr; |
| 185 | png_structp p=(png_structp)png_ptr; |
| 186 | png_uint_32 save_flags=p->flags; |
| 187 | png_uint_32 num_bytes; |
| 188 | |
| 189 | if(png_ptr == NULL) return (NULL); |
| 190 | if (items > PNG_UINT_32_MAX/size) |
| 191 | { |
| 192 | png_warning (p, "Potential overflow in png_zalloc()"); |
| 193 | return (NULL); |
| 194 | } |
| 195 | num_bytes = (png_uint_32)items * size; |
| 196 | |
| 197 | p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK; |
| 198 | ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes); |
| 199 | p->flags=save_flags; |
| 200 | |
| 201 | #if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO) |
| 202 | if (ptr == NULL) |
| 203 | return ((voidpf)ptr); |
| 204 | |
| 205 | if (num_bytes > (png_uint_32)0x8000L) |
| 206 | { |
| 207 | png_memset(ptr, 0, (png_size_t)0x8000L); |
| 208 | png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0, |
| 209 | (png_size_t)(num_bytes - (png_uint_32)0x8000L)); |
| 210 | } |
| 211 | else |
| 212 | { |
| 213 | png_memset(ptr, 0, (png_size_t)num_bytes); |
| 214 | } |
| 215 | #endif |
| 216 | return ((voidpf)ptr); |
| 217 | } |
| 218 | |
| 219 | /* function to free memory for zlib */ |
| 220 | #ifdef PNG_1_0_X |
| 221 | void PNGAPI |
| 222 | #else |
| 223 | void /* private */ |
| 224 | #endif |
| 225 | png_zfree(voidpf png_ptr, voidpf ptr) |
| 226 | { |
| 227 | png_free((png_structp)png_ptr, (png_voidp)ptr); |
| 228 | } |
| 229 | |
| 230 | /* Reset the CRC variable to 32 bits of 1's. Care must be taken |
| 231 | * in case CRC is > 32 bits to leave the top bits 0. |
| 232 | */ |
| 233 | void /* PRIVATE */ |
| 234 | png_reset_crc(png_structp png_ptr) |
| 235 | { |
| 236 | png_ptr->crc = crc32(0, Z_NULL, 0); |
| 237 | } |
| 238 | |
| 239 | /* Calculate the CRC over a section of data. We can only pass as |
| 240 | * much data to this routine as the largest single buffer size. We |
| 241 | * also check that this data will actually be used before going to the |
| 242 | * trouble of calculating it. |
| 243 | */ |
| 244 | void /* PRIVATE */ |
| 245 | png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length) |
| 246 | { |
| 247 | int need_crc = 1; |
| 248 | |
| 249 | if (png_ptr->chunk_name[0] & 0x20) /* ancillary */ |
| 250 | { |
| 251 | if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) == |
| 252 | (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN)) |
| 253 | need_crc = 0; |
| 254 | } |
| 255 | else /* critical */ |
| 256 | { |
| 257 | if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) |
| 258 | need_crc = 0; |
| 259 | } |
| 260 | |
| 261 | if (need_crc) |
| 262 | png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length); |
| 263 | } |
| 264 | |
| 265 | /* Allocate the memory for an info_struct for the application. We don't |
| 266 | * really need the png_ptr, but it could potentially be useful in the |
| 267 | * future. This should be used in favour of malloc(png_sizeof(png_info)) |
| 268 | * and png_info_init() so that applications that want to use a shared |
| 269 | * libpng don't have to be recompiled if png_info changes size. |
| 270 | */ |
| 271 | png_infop PNGAPI |
| 272 | png_create_info_struct(png_structp png_ptr) |
| 273 | { |
| 274 | png_infop info_ptr; |
| 275 | |
| 276 | png_debug(1, "in png_create_info_struct\n"); |
| 277 | if(png_ptr == NULL) return (NULL); |
| 278 | #ifdef PNG_USER_MEM_SUPPORTED |
| 279 | info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO, |
| 280 | png_ptr->malloc_fn, png_ptr->mem_ptr); |
| 281 | #else |
| 282 | info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); |
| 283 | #endif |
| 284 | if (info_ptr != NULL) |
| 285 | png_info_init_3(&info_ptr, png_sizeof(png_info)); |
| 286 | |
| 287 | return (info_ptr); |
| 288 | } |
| 289 | |
| 290 | /* This function frees the memory associated with a single info struct. |
| 291 | * Normally, one would use either png_destroy_read_struct() or |
| 292 | * png_destroy_write_struct() to free an info struct, but this may be |
| 293 | * useful for some applications. |
| 294 | */ |
| 295 | void PNGAPI |
| 296 | png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) |
| 297 | { |
| 298 | png_infop info_ptr = NULL; |
| 299 | if(png_ptr == NULL) return; |
| 300 | |
| 301 | png_debug(1, "in png_destroy_info_struct\n"); |
| 302 | if (info_ptr_ptr != NULL) |
| 303 | info_ptr = *info_ptr_ptr; |
| 304 | |
| 305 | if (info_ptr != NULL) |
| 306 | { |
| 307 | png_info_destroy(png_ptr, info_ptr); |
| 308 | |
| 309 | #ifdef PNG_USER_MEM_SUPPORTED |
| 310 | png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn, |
| 311 | png_ptr->mem_ptr); |
| 312 | #else |
| 313 | png_destroy_struct((png_voidp)info_ptr); |
| 314 | #endif |
| 315 | *info_ptr_ptr = NULL; |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | /* Initialize the info structure. This is now an internal function (0.89) |
| 320 | * and applications using it are urged to use png_create_info_struct() |
| 321 | * instead. |
| 322 | */ |
| 323 | #if defined(PNG_1_0_X) || defined(PNG_1_2_X) |
| 324 | #undef png_info_init |
| 325 | void PNGAPI |
| 326 | png_info_init(png_infop info_ptr) |
| 327 | { |
| 328 | /* We only come here via pre-1.0.12-compiled applications */ |
| 329 | png_info_init_3(&info_ptr, 0); |
| 330 | } |
| 331 | #endif |
| 332 | |
| 333 | void PNGAPI |
| 334 | png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size) |
| 335 | { |
| 336 | png_infop info_ptr = *ptr_ptr; |
| 337 | |
| 338 | if(info_ptr == NULL) return; |
| 339 | |
| 340 | png_debug(1, "in png_info_init_3\n"); |
| 341 | |
| 342 | if(png_sizeof(png_info) > png_info_struct_size) |
| 343 | { |
| 344 | png_destroy_struct(info_ptr); |
| 345 | info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); |
| 346 | *ptr_ptr = info_ptr; |
| 347 | } |
| 348 | |
| 349 | /* set everything to 0 */ |
| 350 | png_memset(info_ptr, 0, png_sizeof (png_info)); |
| 351 | } |
| 352 | |
| 353 | #ifdef PNG_FREE_ME_SUPPORTED |
| 354 | void PNGAPI |
| 355 | png_data_freer(png_structp png_ptr, png_infop info_ptr, |
| 356 | int freer, png_uint_32 mask) |
| 357 | { |
| 358 | png_debug(1, "in png_data_freer\n"); |
| 359 | if (png_ptr == NULL || info_ptr == NULL) |
| 360 | return; |
| 361 | if(freer == PNG_DESTROY_WILL_FREE_DATA) |
| 362 | info_ptr->free_me |= mask; |
| 363 | else if(freer == PNG_USER_WILL_FREE_DATA) |
| 364 | info_ptr->free_me &= ~mask; |
| 365 | else |
| 366 | png_warning(png_ptr, |
| 367 | "Unknown freer parameter in png_data_freer."); |
| 368 | } |
| 369 | #endif |
| 370 | |
| 371 | void PNGAPI |
| 372 | png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, |
| 373 | int num) |
| 374 | { |
| 375 | png_debug(1, "in png_free_data\n"); |
| 376 | if (png_ptr == NULL || info_ptr == NULL) |
| 377 | return; |
| 378 | |
| 379 | #if defined(PNG_TEXT_SUPPORTED) |
| 380 | /* free text item num or (if num == -1) all text items */ |
| 381 | #ifdef PNG_FREE_ME_SUPPORTED |
| 382 | if ((mask & PNG_FREE_TEXT) & info_ptr->free_me) |
| 383 | #else |
| 384 | if (mask & PNG_FREE_TEXT) |
| 385 | #endif |
| 386 | { |
| 387 | if (num != -1) |
| 388 | { |
| 389 | if (info_ptr->text && info_ptr->text[num].key) |
| 390 | { |
| 391 | png_free(png_ptr, info_ptr->text[num].key); |
| 392 | info_ptr->text[num].key = NULL; |
| 393 | } |
| 394 | } |
| 395 | else |
| 396 | { |
| 397 | int i; |
| 398 | for (i = 0; i < info_ptr->num_text; i++) |
| 399 | png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i); |
| 400 | png_free(png_ptr, info_ptr->text); |
| 401 | info_ptr->text = NULL; |
| 402 | info_ptr->num_text=0; |
| 403 | } |
| 404 | } |
| 405 | #endif |
| 406 | |
| 407 | #if defined(PNG_tRNS_SUPPORTED) |
| 408 | /* free any tRNS entry */ |
| 409 | #ifdef PNG_FREE_ME_SUPPORTED |
| 410 | if ((mask & PNG_FREE_TRNS) & info_ptr->free_me) |
| 411 | #else |
| 412 | if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS)) |
| 413 | #endif |
| 414 | { |
| 415 | png_free(png_ptr, info_ptr->trans); |
| 416 | info_ptr->valid &= ~PNG_INFO_tRNS; |
| 417 | #ifndef PNG_FREE_ME_SUPPORTED |
| 418 | png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; |
| 419 | #endif |
| 420 | info_ptr->trans = NULL; |
| 421 | } |
| 422 | #endif |
| 423 | |
| 424 | #if defined(PNG_sCAL_SUPPORTED) |
| 425 | /* free any sCAL entry */ |
| 426 | #ifdef PNG_FREE_ME_SUPPORTED |
| 427 | if ((mask & PNG_FREE_SCAL) & info_ptr->free_me) |
| 428 | #else |
| 429 | if (mask & PNG_FREE_SCAL) |
| 430 | #endif |
| 431 | { |
| 432 | #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) |
| 433 | png_free(png_ptr, info_ptr->scal_s_width); |
| 434 | png_free(png_ptr, info_ptr->scal_s_height); |
| 435 | info_ptr->scal_s_width = NULL; |
| 436 | info_ptr->scal_s_height = NULL; |
| 437 | #endif |
| 438 | info_ptr->valid &= ~PNG_INFO_sCAL; |
| 439 | } |
| 440 | #endif |
| 441 | |
| 442 | #if defined(PNG_pCAL_SUPPORTED) |
| 443 | /* free any pCAL entry */ |
| 444 | #ifdef PNG_FREE_ME_SUPPORTED |
| 445 | if ((mask & PNG_FREE_PCAL) & info_ptr->free_me) |
| 446 | #else |
| 447 | if (mask & PNG_FREE_PCAL) |
| 448 | #endif |
| 449 | { |
| 450 | png_free(png_ptr, info_ptr->pcal_purpose); |
| 451 | png_free(png_ptr, info_ptr->pcal_units); |
| 452 | info_ptr->pcal_purpose = NULL; |
| 453 | info_ptr->pcal_units = NULL; |
| 454 | if (info_ptr->pcal_params != NULL) |
| 455 | { |
| 456 | int i; |
| 457 | for (i = 0; i < (int)info_ptr->pcal_nparams; i++) |
| 458 | { |
| 459 | png_free(png_ptr, info_ptr->pcal_params[i]); |
| 460 | info_ptr->pcal_params[i]=NULL; |
| 461 | } |
| 462 | png_free(png_ptr, info_ptr->pcal_params); |
| 463 | info_ptr->pcal_params = NULL; |
| 464 | } |
| 465 | info_ptr->valid &= ~PNG_INFO_pCAL; |
| 466 | } |
| 467 | #endif |
| 468 | |
| 469 | #if defined(PNG_iCCP_SUPPORTED) |
| 470 | /* free any iCCP entry */ |
| 471 | #ifdef PNG_FREE_ME_SUPPORTED |
| 472 | if ((mask & PNG_FREE_ICCP) & info_ptr->free_me) |
| 473 | #else |
| 474 | if (mask & PNG_FREE_ICCP) |
| 475 | #endif |
| 476 | { |
| 477 | png_free(png_ptr, info_ptr->iccp_name); |
| 478 | png_free(png_ptr, info_ptr->iccp_profile); |
| 479 | info_ptr->iccp_name = NULL; |
| 480 | info_ptr->iccp_profile = NULL; |
| 481 | info_ptr->valid &= ~PNG_INFO_iCCP; |
| 482 | } |
| 483 | #endif |
| 484 | |
| 485 | #if defined(PNG_sPLT_SUPPORTED) |
| 486 | /* free a given sPLT entry, or (if num == -1) all sPLT entries */ |
| 487 | #ifdef PNG_FREE_ME_SUPPORTED |
| 488 | if ((mask & PNG_FREE_SPLT) & info_ptr->free_me) |
| 489 | #else |
| 490 | if (mask & PNG_FREE_SPLT) |
| 491 | #endif |
| 492 | { |
| 493 | if (num != -1) |
| 494 | { |
| 495 | if(info_ptr->splt_palettes) |
| 496 | { |
| 497 | png_free(png_ptr, info_ptr->splt_palettes[num].name); |
| 498 | png_free(png_ptr, info_ptr->splt_palettes[num].entries); |
| 499 | info_ptr->splt_palettes[num].name = NULL; |
| 500 | info_ptr->splt_palettes[num].entries = NULL; |
| 501 | } |
| 502 | } |
| 503 | else |
| 504 | { |
| 505 | if(info_ptr->splt_palettes_num) |
| 506 | { |
| 507 | int i; |
| 508 | for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) |
| 509 | png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i); |
| 510 | |
| 511 | png_free(png_ptr, info_ptr->splt_palettes); |
| 512 | info_ptr->splt_palettes = NULL; |
| 513 | info_ptr->splt_palettes_num = 0; |
| 514 | } |
| 515 | info_ptr->valid &= ~PNG_INFO_sPLT; |
| 516 | } |
| 517 | } |
| 518 | #endif |
| 519 | |
| 520 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 521 | if(png_ptr->unknown_chunk.data) |
| 522 | { |
| 523 | png_free(png_ptr, png_ptr->unknown_chunk.data); |
| 524 | png_ptr->unknown_chunk.data = NULL; |
| 525 | } |
| 526 | #ifdef PNG_FREE_ME_SUPPORTED |
| 527 | if ((mask & PNG_FREE_UNKN) & info_ptr->free_me) |
| 528 | #else |
| 529 | if (mask & PNG_FREE_UNKN) |
| 530 | #endif |
| 531 | { |
| 532 | if (num != -1) |
| 533 | { |
| 534 | if(info_ptr->unknown_chunks) |
| 535 | { |
| 536 | png_free(png_ptr, info_ptr->unknown_chunks[num].data); |
| 537 | info_ptr->unknown_chunks[num].data = NULL; |
| 538 | } |
| 539 | } |
| 540 | else |
| 541 | { |
| 542 | int i; |
| 543 | |
| 544 | if(info_ptr->unknown_chunks_num) |
| 545 | { |
| 546 | for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++) |
| 547 | png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i); |
| 548 | |
| 549 | png_free(png_ptr, info_ptr->unknown_chunks); |
| 550 | info_ptr->unknown_chunks = NULL; |
| 551 | info_ptr->unknown_chunks_num = 0; |
| 552 | } |
| 553 | } |
| 554 | } |
| 555 | #endif |
| 556 | |
| 557 | #if defined(PNG_hIST_SUPPORTED) |
| 558 | /* free any hIST entry */ |
| 559 | #ifdef PNG_FREE_ME_SUPPORTED |
| 560 | if ((mask & PNG_FREE_HIST) & info_ptr->free_me) |
| 561 | #else |
| 562 | if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST)) |
| 563 | #endif |
| 564 | { |
| 565 | png_free(png_ptr, info_ptr->hist); |
| 566 | info_ptr->hist = NULL; |
| 567 | info_ptr->valid &= ~PNG_INFO_hIST; |
| 568 | #ifndef PNG_FREE_ME_SUPPORTED |
| 569 | png_ptr->flags &= ~PNG_FLAG_FREE_HIST; |
| 570 | #endif |
| 571 | } |
| 572 | #endif |
| 573 | |
| 574 | /* free any PLTE entry that was internally allocated */ |
| 575 | #ifdef PNG_FREE_ME_SUPPORTED |
| 576 | if ((mask & PNG_FREE_PLTE) & info_ptr->free_me) |
| 577 | #else |
| 578 | if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE)) |
| 579 | #endif |
| 580 | { |
| 581 | png_zfree(png_ptr, info_ptr->palette); |
| 582 | info_ptr->palette = NULL; |
| 583 | info_ptr->valid &= ~PNG_INFO_PLTE; |
| 584 | #ifndef PNG_FREE_ME_SUPPORTED |
| 585 | png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; |
| 586 | #endif |
| 587 | info_ptr->num_palette = 0; |
| 588 | } |
| 589 | |
| 590 | #if defined(PNG_INFO_IMAGE_SUPPORTED) |
| 591 | /* free any image bits attached to the info structure */ |
| 592 | #ifdef PNG_FREE_ME_SUPPORTED |
| 593 | if ((mask & PNG_FREE_ROWS) & info_ptr->free_me) |
| 594 | #else |
| 595 | if (mask & PNG_FREE_ROWS) |
| 596 | #endif |
| 597 | { |
| 598 | if(info_ptr->row_pointers) |
| 599 | { |
| 600 | int row; |
| 601 | for (row = 0; row < (int)info_ptr->height; row++) |
| 602 | { |
| 603 | png_free(png_ptr, info_ptr->row_pointers[row]); |
| 604 | info_ptr->row_pointers[row]=NULL; |
| 605 | } |
| 606 | png_free(png_ptr, info_ptr->row_pointers); |
| 607 | info_ptr->row_pointers=NULL; |
| 608 | } |
| 609 | info_ptr->valid &= ~PNG_INFO_IDAT; |
| 610 | } |
| 611 | #endif |
| 612 | |
| 613 | #ifdef PNG_FREE_ME_SUPPORTED |
| 614 | if(num == -1) |
| 615 | info_ptr->free_me &= ~mask; |
| 616 | else |
| 617 | info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL); |
| 618 | #endif |
| 619 | } |
| 620 | |
| 621 | /* This is an internal routine to free any memory that the info struct is |
| 622 | * pointing to before re-using it or freeing the struct itself. Recall |
| 623 | * that png_free() checks for NULL pointers for us. |
| 624 | */ |
| 625 | void /* PRIVATE */ |
| 626 | png_info_destroy(png_structp png_ptr, png_infop info_ptr) |
| 627 | { |
| 628 | png_debug(1, "in png_info_destroy\n"); |
| 629 | |
| 630 | png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); |
| 631 | |
| 632 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 633 | if (png_ptr->num_chunk_list) |
| 634 | { |
| 635 | png_free(png_ptr, png_ptr->chunk_list); |
| 636 | png_ptr->chunk_list=NULL; |
| 637 | png_ptr->num_chunk_list=0; |
| 638 | } |
| 639 | #endif |
| 640 | |
| 641 | png_info_init_3(&info_ptr, png_sizeof(png_info)); |
| 642 | } |
| 643 | #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |
| 644 | |
| 645 | /* This function returns a pointer to the io_ptr associated with the user |
| 646 | * functions. The application should free any memory associated with this |
| 647 | * pointer before png_write_destroy() or png_read_destroy() are called. |
| 648 | */ |
| 649 | png_voidp PNGAPI |
| 650 | png_get_io_ptr(png_structp png_ptr) |
| 651 | { |
| 652 | if(png_ptr == NULL) return (NULL); |
| 653 | return (png_ptr->io_ptr); |
| 654 | } |
| 655 | |
| 656 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| 657 | #if !defined(PNG_NO_STDIO) |
| 658 | /* Initialize the default input/output functions for the PNG file. If you |
| 659 | * use your own read or write routines, you can call either png_set_read_fn() |
| 660 | * or png_set_write_fn() instead of png_init_io(). If you have defined |
| 661 | * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't |
| 662 | * necessarily available. |
| 663 | */ |
| 664 | void PNGAPI |
| 665 | png_init_io(png_structp png_ptr, png_FILE_p fp) |
| 666 | { |
| 667 | png_debug(1, "in png_init_io\n"); |
| 668 | if(png_ptr == NULL) return; |
| 669 | png_ptr->io_ptr = (png_voidp)fp; |
| 670 | } |
| 671 | #endif |
| 672 | |
| 673 | #if defined(PNG_TIME_RFC1123_SUPPORTED) |
| 674 | /* Convert the supplied time into an RFC 1123 string suitable for use in |
| 675 | * a "Creation Time" or other text-based time string. |
| 676 | */ |
| 677 | png_charp PNGAPI |
| 678 | png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime) |
| 679 | { |
| 680 | static PNG_CONST char short_months[12][4] = |
| 681 | {"Jan", "Feb", "Mar", "Apr", "May", "Jun", |
| 682 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; |
| 683 | |
| 684 | if(png_ptr == NULL) return (NULL); |
| 685 | if (png_ptr->time_buffer == NULL) |
| 686 | { |
| 687 | png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29* |
| 688 | png_sizeof(char))); |
| 689 | } |
| 690 | |
| 691 | #if defined(_WIN32_WCE) |
| 692 | { |
| 693 | wchar_t time_buf[29]; |
| 694 | wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"), |
| 695 | ptime->day % 32, short_months[(ptime->month - 1) % 12], |
| 696 | ptime->year, ptime->hour % 24, ptime->minute % 60, |
| 697 | ptime->second % 61); |
| 698 | WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29, |
| 699 | NULL, NULL); |
| 700 | } |
| 701 | #else |
| 702 | #ifdef USE_FAR_KEYWORD |
| 703 | { |
| 704 | char near_time_buf[29]; |
| 705 | sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000", |
| 706 | ptime->day % 32, short_months[(ptime->month - 1) % 12], |
| 707 | ptime->year, ptime->hour % 24, ptime->minute % 60, |
| 708 | ptime->second % 61); |
| 709 | png_memcpy(png_ptr->time_buffer, near_time_buf, |
| 710 | 29*png_sizeof(char)); |
| 711 | } |
| 712 | #else |
| 713 | sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000", |
| 714 | ptime->day % 32, short_months[(ptime->month - 1) % 12], |
| 715 | ptime->year, ptime->hour % 24, ptime->minute % 60, |
| 716 | ptime->second % 61); |
| 717 | #endif |
| 718 | #endif /* _WIN32_WCE */ |
| 719 | return ((png_charp)png_ptr->time_buffer); |
| 720 | } |
| 721 | #endif /* PNG_TIME_RFC1123_SUPPORTED */ |
| 722 | |
| 723 | #if 0 |
| 724 | /* Signature string for a PNG file. */ |
| 725 | png_bytep PNGAPI |
| 726 | png_sig_bytes(void) |
| 727 | { |
| 728 | return ((png_bytep)"\211\120\116\107\015\012\032\012"); |
| 729 | } |
| 730 | #endif |
| 731 | #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |
| 732 | |
| 733 | png_charp PNGAPI |
| 734 | png_get_copyright(png_structp png_ptr) |
| 735 | { |
| 736 | if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */ |
| 737 | return ((png_charp) "\n libpng version 1.2.18 - May 15, 2007\n\ |
| 738 | Copyright (c) 1998-2007 Glenn Randers-Pehrson\n\ |
| 739 | Copyright (c) 1996-1997 Andreas Dilger\n\ |
| 740 | Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n"); |
| 741 | return ((png_charp) ""); |
| 742 | } |
| 743 | |
| 744 | /* The following return the library version as a short string in the |
| 745 | * format 1.0.0 through 99.99.99zz. To get the version of *.h files |
| 746 | * used with your application, print out PNG_LIBPNG_VER_STRING, which |
| 747 | * is defined in png.h. |
| 748 | * Note: now there is no difference between png_get_libpng_ver() and |
| 749 | * png_get_header_ver(). Due to the version_nn_nn_nn typedef guard, |
| 750 | * it is guaranteed that png.c uses the correct version of png.h. |
| 751 | */ |
| 752 | png_charp PNGAPI |
| 753 | png_get_libpng_ver(png_structp png_ptr) |
| 754 | { |
| 755 | /* Version of *.c files used when building libpng */ |
| 756 | if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */ |
| 757 | return ((png_charp) PNG_LIBPNG_VER_STRING); |
| 758 | return ((png_charp) ""); |
| 759 | } |
| 760 | |
| 761 | png_charp PNGAPI |
| 762 | png_get_header_ver(png_structp png_ptr) |
| 763 | { |
| 764 | /* Version of *.h files used when building libpng */ |
| 765 | if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */ |
| 766 | return ((png_charp) PNG_LIBPNG_VER_STRING); |
| 767 | return ((png_charp) ""); |
| 768 | } |
| 769 | |
| 770 | png_charp PNGAPI |
| 771 | png_get_header_version(png_structp png_ptr) |
| 772 | { |
| 773 | /* Returns longer string containing both version and date */ |
| 774 | if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */ |
| 775 | return ((png_charp) PNG_HEADER_VERSION_STRING); |
| 776 | return ((png_charp) ""); |
| 777 | } |
| 778 | |
| 779 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| 780 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| 781 | int PNGAPI |
| 782 | png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name) |
| 783 | { |
| 784 | /* check chunk_name and return "keep" value if it's on the list, else 0 */ |
| 785 | int i; |
| 786 | png_bytep p; |
| 787 | if((png_ptr == NULL && chunk_name == NULL) || png_ptr->num_chunk_list<=0) |
| 788 | return 0; |
| 789 | p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5; |
| 790 | for (i = png_ptr->num_chunk_list; i; i--, p-=5) |
| 791 | if (!png_memcmp(chunk_name, p, 4)) |
| 792 | return ((int)*(p+4)); |
| 793 | return 0; |
| 794 | } |
| 795 | #endif |
| 796 | |
| 797 | /* This function, added to libpng-1.0.6g, is untested. */ |
| 798 | int PNGAPI |
| 799 | png_reset_zstream(png_structp png_ptr) |
| 800 | { |
| 801 | if (png_ptr == NULL) return Z_STREAM_ERROR; |
| 802 | return (inflateReset(&png_ptr->zstream)); |
| 803 | } |
| 804 | #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |
| 805 | |
| 806 | /* This function was added to libpng-1.0.7 */ |
| 807 | png_uint_32 PNGAPI |
| 808 | png_access_version_number(void) |
| 809 | { |
| 810 | /* Version of *.c files used when building libpng */ |
| 811 | return((png_uint_32) PNG_LIBPNG_VER); |
| 812 | } |
| 813 | |
| 814 | |
| 815 | #if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
| 816 | #if !defined(PNG_1_0_X) |
| 817 | #if defined(PNG_MMX_CODE_SUPPORTED) |
| 818 | /* this INTERNAL function was added to libpng 1.2.0 */ |
| 819 | void /* PRIVATE */ |
| 820 | png_init_mmx_flags (png_structp png_ptr) |
| 821 | { |
| 822 | if(png_ptr == NULL) return; |
| 823 | png_ptr->mmx_rowbytes_threshold = 0; |
| 824 | png_ptr->mmx_bitdepth_threshold = 0; |
| 825 | |
| 826 | # if (defined(PNG_USE_PNGVCRD) || defined(PNG_USE_PNGGCCRD)) |
| 827 | |
| 828 | png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_COMPILED; |
| 829 | |
| 830 | if (png_mmx_support() > 0) { |
| 831 | png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU |
| 832 | # ifdef PNG_HAVE_MMX_COMBINE_ROW |
| 833 | | PNG_ASM_FLAG_MMX_READ_COMBINE_ROW |
| 834 | # endif |
| 835 | # ifdef PNG_HAVE_MMX_READ_INTERLACE |
| 836 | | PNG_ASM_FLAG_MMX_READ_INTERLACE |
| 837 | # endif |
| 838 | # ifndef PNG_HAVE_MMX_READ_FILTER_ROW |
| 839 | ; |
| 840 | # else |
| 841 | | PNG_ASM_FLAG_MMX_READ_FILTER_SUB |
| 842 | | PNG_ASM_FLAG_MMX_READ_FILTER_UP |
| 843 | | PNG_ASM_FLAG_MMX_READ_FILTER_AVG |
| 844 | | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ; |
| 845 | |
| 846 | png_ptr->mmx_rowbytes_threshold = PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT; |
| 847 | png_ptr->mmx_bitdepth_threshold = PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT; |
| 848 | # endif |
| 849 | } else { |
| 850 | png_ptr->asm_flags &= ~( PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU |
| 851 | | PNG_MMX_READ_FLAGS |
| 852 | | PNG_MMX_WRITE_FLAGS ); |
| 853 | } |
| 854 | |
| 855 | # else /* !(PNGVCRD || PNGGCCRD) */ |
| 856 | |
| 857 | /* clear all MMX flags; no support is compiled in */ |
| 858 | png_ptr->asm_flags &= ~( PNG_MMX_FLAGS ); |
| 859 | |
| 860 | # endif /* ?(PNGVCRD || PNGGCCRD) */ |
| 861 | } |
| 862 | |
| 863 | #endif /* !(PNG_MMX_CODE_SUPPORTED) */ |
| 864 | |
| 865 | /* this function was added to libpng 1.2.0 */ |
| 866 | #if !defined(PNG_USE_PNGGCCRD) && \ |
| 867 | !(defined(PNG_MMX_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD)) |
| 868 | int PNGAPI |
| 869 | png_mmx_support(void) |
| 870 | { |
| 871 | return -1; |
| 872 | } |
| 873 | #endif |
| 874 | #endif /* PNG_1_0_X && PNG_ASSEMBLER_CODE_SUPPORTED */ |
| 875 | #endif /* PNG_READ_SUPPORTED */ |
| 876 | |
| 877 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| 878 | #ifdef PNG_SIZE_T |
| 879 | /* Added at libpng version 1.2.6 */ |
| 880 | PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); |
| 881 | png_size_t PNGAPI |
| 882 | png_convert_size(size_t size) |
| 883 | { |
| 884 | if (size > (png_size_t)-1) |
| 885 | PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */ |
| 886 | return ((png_size_t)size); |
| 887 | } |
| 888 | #endif /* PNG_SIZE_T */ |
| 889 | #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |