The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | |
| 2 | /* png.c - location for general purpose libpng functions |
| 3 | * |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 4 | * Last changed in libpng 1.2.34 [December 18, 2008] |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 5 | * For conditions of distribution and use, see copyright notice in png.h |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 6 | * Copyright (c) 1998-2008 Glenn Randers-Pehrson |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 7 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 8 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| 9 | */ |
| 10 | |
| 11 | #define PNG_INTERNAL |
| 12 | #define PNG_NO_EXTERN |
| 13 | #include "png.h" |
| 14 | |
| 15 | /* Generate a compiler error if there is an old png.h in the search path. */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 16 | typedef version_1_2_35 Your_png_h_is_not_version_1_2_35; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 17 | |
| 18 | /* Version information for C files. This had better match the version |
| 19 | * string defined in png.h. */ |
| 20 | |
| 21 | #ifdef PNG_USE_GLOBAL_ARRAYS |
| 22 | /* png_libpng_ver was changed to a function in version 1.0.5c */ |
| 23 | PNG_CONST char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING; |
| 24 | |
| 25 | #ifdef PNG_READ_SUPPORTED |
| 26 | |
| 27 | /* png_sig was changed to a function in version 1.0.5c */ |
| 28 | /* Place to hold the signature string for a PNG file. */ |
| 29 | PNG_CONST png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; |
| 30 | #endif /* PNG_READ_SUPPORTED */ |
| 31 | |
| 32 | /* Invoke global declarations for constant strings for known chunk types */ |
| 33 | PNG_IHDR; |
| 34 | PNG_IDAT; |
| 35 | PNG_IEND; |
| 36 | PNG_PLTE; |
| 37 | PNG_bKGD; |
| 38 | PNG_cHRM; |
| 39 | PNG_gAMA; |
| 40 | PNG_hIST; |
| 41 | PNG_iCCP; |
| 42 | PNG_iTXt; |
| 43 | PNG_oFFs; |
| 44 | PNG_pCAL; |
| 45 | PNG_sCAL; |
| 46 | PNG_pHYs; |
| 47 | PNG_sBIT; |
| 48 | PNG_sPLT; |
| 49 | PNG_sRGB; |
| 50 | PNG_tEXt; |
| 51 | PNG_tIME; |
| 52 | PNG_tRNS; |
| 53 | PNG_zTXt; |
| 54 | |
| 55 | #ifdef PNG_READ_SUPPORTED |
| 56 | /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
| 57 | |
| 58 | /* start of interlace block */ |
| 59 | PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; |
| 60 | |
| 61 | /* offset to next interlace block */ |
| 62 | PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; |
| 63 | |
| 64 | /* start of interlace block in the y direction */ |
| 65 | PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; |
| 66 | |
| 67 | /* offset to next interlace block in the y direction */ |
| 68 | PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; |
| 69 | |
| 70 | /* Height of interlace block. This is not currently used - if you need |
| 71 | * it, uncomment it here and in png.h |
| 72 | PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; |
| 73 | */ |
| 74 | |
| 75 | /* Mask to determine which pixels are valid in a pass */ |
| 76 | PNG_CONST int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; |
| 77 | |
| 78 | /* Mask to determine which pixels to overwrite while displaying */ |
| 79 | PNG_CONST int FARDATA png_pass_dsp_mask[] |
| 80 | = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; |
| 81 | |
| 82 | #endif /* PNG_READ_SUPPORTED */ |
| 83 | #endif /* PNG_USE_GLOBAL_ARRAYS */ |
| 84 | |
| 85 | /* Tells libpng that we have already handled the first "num_bytes" bytes |
| 86 | * of the PNG file signature. If the PNG data is embedded into another |
| 87 | * stream we can set num_bytes = 8 so that libpng will not attempt to read |
| 88 | * or write any of the magic bytes before it starts on the IHDR. |
| 89 | */ |
| 90 | |
| 91 | #ifdef PNG_READ_SUPPORTED |
| 92 | void PNGAPI |
| 93 | png_set_sig_bytes(png_structp png_ptr, int num_bytes) |
| 94 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 95 | if (png_ptr == NULL) return; |
| 96 | png_debug(1, "in png_set_sig_bytes"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 97 | if (num_bytes > 8) |
| 98 | png_error(png_ptr, "Too many bytes for PNG signature."); |
| 99 | |
| 100 | png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes); |
| 101 | } |
| 102 | |
| 103 | /* Checks whether the supplied bytes match the PNG signature. We allow |
| 104 | * checking less than the full 8-byte signature so that those apps that |
| 105 | * already read the first few bytes of a file to determine the file type |
| 106 | * can simply check the remaining bytes for extra assurance. Returns |
| 107 | * an integer less than, equal to, or greater than zero if sig is found, |
| 108 | * respectively, to be less than, to match, or be greater than the correct |
| 109 | * PNG signature (this is the same behaviour as strcmp, memcmp, etc). |
| 110 | */ |
| 111 | int PNGAPI |
| 112 | png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check) |
| 113 | { |
| 114 | png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; |
| 115 | if (num_to_check > 8) |
| 116 | num_to_check = 8; |
| 117 | else if (num_to_check < 1) |
| 118 | return (-1); |
| 119 | |
| 120 | if (start > 7) |
| 121 | return (-1); |
| 122 | |
| 123 | if (start + num_to_check > 8) |
| 124 | num_to_check = 8 - start; |
| 125 | |
| 126 | return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check))); |
| 127 | } |
| 128 | |
| 129 | #if defined(PNG_1_0_X) || defined(PNG_1_2_X) |
| 130 | /* (Obsolete) function to check signature bytes. It does not allow one |
| 131 | * to check a partial signature. This function might be removed in the |
| 132 | * future - use png_sig_cmp(). Returns true (nonzero) if the file is PNG. |
| 133 | */ |
| 134 | int PNGAPI |
| 135 | png_check_sig(png_bytep sig, int num) |
| 136 | { |
| 137 | return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num)); |
| 138 | } |
| 139 | #endif |
| 140 | #endif /* PNG_READ_SUPPORTED */ |
| 141 | |
| 142 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| 143 | /* Function to allocate memory for zlib and clear it to 0. */ |
| 144 | #ifdef PNG_1_0_X |
| 145 | voidpf PNGAPI |
| 146 | #else |
| 147 | voidpf /* private */ |
| 148 | #endif |
| 149 | png_zalloc(voidpf png_ptr, uInt items, uInt size) |
| 150 | { |
| 151 | png_voidp ptr; |
| 152 | png_structp p=(png_structp)png_ptr; |
| 153 | png_uint_32 save_flags=p->flags; |
| 154 | png_uint_32 num_bytes; |
| 155 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 156 | if (png_ptr == NULL) return (NULL); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 157 | if (items > PNG_UINT_32_MAX/size) |
| 158 | { |
| 159 | png_warning (p, "Potential overflow in png_zalloc()"); |
| 160 | return (NULL); |
| 161 | } |
| 162 | num_bytes = (png_uint_32)items * size; |
| 163 | |
| 164 | p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK; |
| 165 | ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes); |
| 166 | p->flags=save_flags; |
| 167 | |
| 168 | #if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO) |
| 169 | if (ptr == NULL) |
| 170 | return ((voidpf)ptr); |
| 171 | |
| 172 | if (num_bytes > (png_uint_32)0x8000L) |
| 173 | { |
| 174 | png_memset(ptr, 0, (png_size_t)0x8000L); |
| 175 | png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0, |
| 176 | (png_size_t)(num_bytes - (png_uint_32)0x8000L)); |
| 177 | } |
| 178 | else |
| 179 | { |
| 180 | png_memset(ptr, 0, (png_size_t)num_bytes); |
| 181 | } |
| 182 | #endif |
| 183 | return ((voidpf)ptr); |
| 184 | } |
| 185 | |
| 186 | /* function to free memory for zlib */ |
| 187 | #ifdef PNG_1_0_X |
| 188 | void PNGAPI |
| 189 | #else |
| 190 | void /* private */ |
| 191 | #endif |
| 192 | png_zfree(voidpf png_ptr, voidpf ptr) |
| 193 | { |
| 194 | png_free((png_structp)png_ptr, (png_voidp)ptr); |
| 195 | } |
| 196 | |
| 197 | /* Reset the CRC variable to 32 bits of 1's. Care must be taken |
| 198 | * in case CRC is > 32 bits to leave the top bits 0. |
| 199 | */ |
| 200 | void /* PRIVATE */ |
| 201 | png_reset_crc(png_structp png_ptr) |
| 202 | { |
| 203 | png_ptr->crc = crc32(0, Z_NULL, 0); |
| 204 | } |
| 205 | |
| 206 | /* Calculate the CRC over a section of data. We can only pass as |
| 207 | * much data to this routine as the largest single buffer size. We |
| 208 | * also check that this data will actually be used before going to the |
| 209 | * trouble of calculating it. |
| 210 | */ |
| 211 | void /* PRIVATE */ |
| 212 | png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length) |
| 213 | { |
| 214 | int need_crc = 1; |
| 215 | |
| 216 | if (png_ptr->chunk_name[0] & 0x20) /* ancillary */ |
| 217 | { |
| 218 | if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) == |
| 219 | (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN)) |
| 220 | need_crc = 0; |
| 221 | } |
| 222 | else /* critical */ |
| 223 | { |
| 224 | if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) |
| 225 | need_crc = 0; |
| 226 | } |
| 227 | |
| 228 | if (need_crc) |
| 229 | png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length); |
| 230 | } |
| 231 | |
| 232 | /* Allocate the memory for an info_struct for the application. We don't |
| 233 | * really need the png_ptr, but it could potentially be useful in the |
| 234 | * future. This should be used in favour of malloc(png_sizeof(png_info)) |
| 235 | * and png_info_init() so that applications that want to use a shared |
| 236 | * libpng don't have to be recompiled if png_info changes size. |
| 237 | */ |
| 238 | png_infop PNGAPI |
| 239 | png_create_info_struct(png_structp png_ptr) |
| 240 | { |
| 241 | png_infop info_ptr; |
| 242 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 243 | png_debug(1, "in png_create_info_struct"); |
| 244 | if (png_ptr == NULL) return (NULL); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 245 | #ifdef PNG_USER_MEM_SUPPORTED |
| 246 | info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO, |
| 247 | png_ptr->malloc_fn, png_ptr->mem_ptr); |
| 248 | #else |
| 249 | info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); |
| 250 | #endif |
| 251 | if (info_ptr != NULL) |
| 252 | png_info_init_3(&info_ptr, png_sizeof(png_info)); |
| 253 | |
| 254 | return (info_ptr); |
| 255 | } |
| 256 | |
| 257 | /* This function frees the memory associated with a single info struct. |
| 258 | * Normally, one would use either png_destroy_read_struct() or |
| 259 | * png_destroy_write_struct() to free an info struct, but this may be |
| 260 | * useful for some applications. |
| 261 | */ |
| 262 | void PNGAPI |
| 263 | png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) |
| 264 | { |
| 265 | png_infop info_ptr = NULL; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 266 | if (png_ptr == NULL) return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 267 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 268 | png_debug(1, "in png_destroy_info_struct"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 269 | if (info_ptr_ptr != NULL) |
| 270 | info_ptr = *info_ptr_ptr; |
| 271 | |
| 272 | if (info_ptr != NULL) |
| 273 | { |
| 274 | png_info_destroy(png_ptr, info_ptr); |
| 275 | |
| 276 | #ifdef PNG_USER_MEM_SUPPORTED |
| 277 | png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn, |
| 278 | png_ptr->mem_ptr); |
| 279 | #else |
| 280 | png_destroy_struct((png_voidp)info_ptr); |
| 281 | #endif |
| 282 | *info_ptr_ptr = NULL; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | /* Initialize the info structure. This is now an internal function (0.89) |
| 287 | * and applications using it are urged to use png_create_info_struct() |
| 288 | * instead. |
| 289 | */ |
| 290 | #if defined(PNG_1_0_X) || defined(PNG_1_2_X) |
| 291 | #undef png_info_init |
| 292 | void PNGAPI |
| 293 | png_info_init(png_infop info_ptr) |
| 294 | { |
| 295 | /* We only come here via pre-1.0.12-compiled applications */ |
| 296 | png_info_init_3(&info_ptr, 0); |
| 297 | } |
| 298 | #endif |
| 299 | |
| 300 | void PNGAPI |
| 301 | png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size) |
| 302 | { |
| 303 | png_infop info_ptr = *ptr_ptr; |
| 304 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 305 | if (info_ptr == NULL) return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 306 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 307 | png_debug(1, "in png_info_init_3"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 308 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 309 | if (png_sizeof(png_info) > png_info_struct_size) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 310 | { |
| 311 | png_destroy_struct(info_ptr); |
| 312 | info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); |
| 313 | *ptr_ptr = info_ptr; |
| 314 | } |
| 315 | |
| 316 | /* set everything to 0 */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 317 | png_memset(info_ptr, 0, png_sizeof(png_info)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | #ifdef PNG_FREE_ME_SUPPORTED |
| 321 | void PNGAPI |
| 322 | png_data_freer(png_structp png_ptr, png_infop info_ptr, |
| 323 | int freer, png_uint_32 mask) |
| 324 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 325 | png_debug(1, "in png_data_freer"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 326 | if (png_ptr == NULL || info_ptr == NULL) |
| 327 | return; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 328 | if (freer == PNG_DESTROY_WILL_FREE_DATA) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 329 | info_ptr->free_me |= mask; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 330 | else if (freer == PNG_USER_WILL_FREE_DATA) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 331 | info_ptr->free_me &= ~mask; |
| 332 | else |
| 333 | png_warning(png_ptr, |
| 334 | "Unknown freer parameter in png_data_freer."); |
| 335 | } |
| 336 | #endif |
| 337 | |
| 338 | void PNGAPI |
| 339 | png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, |
| 340 | int num) |
| 341 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 342 | png_debug(1, "in png_free_data"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 343 | if (png_ptr == NULL || info_ptr == NULL) |
| 344 | return; |
| 345 | |
| 346 | #if defined(PNG_TEXT_SUPPORTED) |
| 347 | /* free text item num or (if num == -1) all text items */ |
| 348 | #ifdef PNG_FREE_ME_SUPPORTED |
| 349 | if ((mask & PNG_FREE_TEXT) & info_ptr->free_me) |
| 350 | #else |
| 351 | if (mask & PNG_FREE_TEXT) |
| 352 | #endif |
| 353 | { |
| 354 | if (num != -1) |
| 355 | { |
| 356 | if (info_ptr->text && info_ptr->text[num].key) |
| 357 | { |
| 358 | png_free(png_ptr, info_ptr->text[num].key); |
| 359 | info_ptr->text[num].key = NULL; |
| 360 | } |
| 361 | } |
| 362 | else |
| 363 | { |
| 364 | int i; |
| 365 | for (i = 0; i < info_ptr->num_text; i++) |
| 366 | png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i); |
| 367 | png_free(png_ptr, info_ptr->text); |
| 368 | info_ptr->text = NULL; |
| 369 | info_ptr->num_text=0; |
| 370 | } |
| 371 | } |
| 372 | #endif |
| 373 | |
| 374 | #if defined(PNG_tRNS_SUPPORTED) |
| 375 | /* free any tRNS entry */ |
| 376 | #ifdef PNG_FREE_ME_SUPPORTED |
| 377 | if ((mask & PNG_FREE_TRNS) & info_ptr->free_me) |
| 378 | #else |
| 379 | if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS)) |
| 380 | #endif |
| 381 | { |
| 382 | png_free(png_ptr, info_ptr->trans); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 383 | info_ptr->trans = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 384 | info_ptr->valid &= ~PNG_INFO_tRNS; |
| 385 | #ifndef PNG_FREE_ME_SUPPORTED |
| 386 | png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; |
| 387 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 388 | } |
| 389 | #endif |
| 390 | |
| 391 | #if defined(PNG_sCAL_SUPPORTED) |
| 392 | /* free any sCAL entry */ |
| 393 | #ifdef PNG_FREE_ME_SUPPORTED |
| 394 | if ((mask & PNG_FREE_SCAL) & info_ptr->free_me) |
| 395 | #else |
| 396 | if (mask & PNG_FREE_SCAL) |
| 397 | #endif |
| 398 | { |
| 399 | #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) |
| 400 | png_free(png_ptr, info_ptr->scal_s_width); |
| 401 | png_free(png_ptr, info_ptr->scal_s_height); |
| 402 | info_ptr->scal_s_width = NULL; |
| 403 | info_ptr->scal_s_height = NULL; |
| 404 | #endif |
| 405 | info_ptr->valid &= ~PNG_INFO_sCAL; |
| 406 | } |
| 407 | #endif |
| 408 | |
| 409 | #if defined(PNG_pCAL_SUPPORTED) |
| 410 | /* free any pCAL entry */ |
| 411 | #ifdef PNG_FREE_ME_SUPPORTED |
| 412 | if ((mask & PNG_FREE_PCAL) & info_ptr->free_me) |
| 413 | #else |
| 414 | if (mask & PNG_FREE_PCAL) |
| 415 | #endif |
| 416 | { |
| 417 | png_free(png_ptr, info_ptr->pcal_purpose); |
| 418 | png_free(png_ptr, info_ptr->pcal_units); |
| 419 | info_ptr->pcal_purpose = NULL; |
| 420 | info_ptr->pcal_units = NULL; |
| 421 | if (info_ptr->pcal_params != NULL) |
| 422 | { |
| 423 | int i; |
| 424 | for (i = 0; i < (int)info_ptr->pcal_nparams; i++) |
| 425 | { |
| 426 | png_free(png_ptr, info_ptr->pcal_params[i]); |
| 427 | info_ptr->pcal_params[i]=NULL; |
| 428 | } |
| 429 | png_free(png_ptr, info_ptr->pcal_params); |
| 430 | info_ptr->pcal_params = NULL; |
| 431 | } |
| 432 | info_ptr->valid &= ~PNG_INFO_pCAL; |
| 433 | } |
| 434 | #endif |
| 435 | |
| 436 | #if defined(PNG_iCCP_SUPPORTED) |
| 437 | /* free any iCCP entry */ |
| 438 | #ifdef PNG_FREE_ME_SUPPORTED |
| 439 | if ((mask & PNG_FREE_ICCP) & info_ptr->free_me) |
| 440 | #else |
| 441 | if (mask & PNG_FREE_ICCP) |
| 442 | #endif |
| 443 | { |
| 444 | png_free(png_ptr, info_ptr->iccp_name); |
| 445 | png_free(png_ptr, info_ptr->iccp_profile); |
| 446 | info_ptr->iccp_name = NULL; |
| 447 | info_ptr->iccp_profile = NULL; |
| 448 | info_ptr->valid &= ~PNG_INFO_iCCP; |
| 449 | } |
| 450 | #endif |
| 451 | |
| 452 | #if defined(PNG_sPLT_SUPPORTED) |
| 453 | /* free a given sPLT entry, or (if num == -1) all sPLT entries */ |
| 454 | #ifdef PNG_FREE_ME_SUPPORTED |
| 455 | if ((mask & PNG_FREE_SPLT) & info_ptr->free_me) |
| 456 | #else |
| 457 | if (mask & PNG_FREE_SPLT) |
| 458 | #endif |
| 459 | { |
| 460 | if (num != -1) |
| 461 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 462 | if (info_ptr->splt_palettes) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 463 | { |
| 464 | png_free(png_ptr, info_ptr->splt_palettes[num].name); |
| 465 | png_free(png_ptr, info_ptr->splt_palettes[num].entries); |
| 466 | info_ptr->splt_palettes[num].name = NULL; |
| 467 | info_ptr->splt_palettes[num].entries = NULL; |
| 468 | } |
| 469 | } |
| 470 | else |
| 471 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 472 | if (info_ptr->splt_palettes_num) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 473 | { |
| 474 | int i; |
| 475 | for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) |
| 476 | png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i); |
| 477 | |
| 478 | png_free(png_ptr, info_ptr->splt_palettes); |
| 479 | info_ptr->splt_palettes = NULL; |
| 480 | info_ptr->splt_palettes_num = 0; |
| 481 | } |
| 482 | info_ptr->valid &= ~PNG_INFO_sPLT; |
| 483 | } |
| 484 | } |
| 485 | #endif |
| 486 | |
| 487 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 488 | if (png_ptr->unknown_chunk.data) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 489 | { |
| 490 | png_free(png_ptr, png_ptr->unknown_chunk.data); |
| 491 | png_ptr->unknown_chunk.data = NULL; |
| 492 | } |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 493 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 494 | #ifdef PNG_FREE_ME_SUPPORTED |
| 495 | if ((mask & PNG_FREE_UNKN) & info_ptr->free_me) |
| 496 | #else |
| 497 | if (mask & PNG_FREE_UNKN) |
| 498 | #endif |
| 499 | { |
| 500 | if (num != -1) |
| 501 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 502 | if (info_ptr->unknown_chunks) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 503 | { |
| 504 | png_free(png_ptr, info_ptr->unknown_chunks[num].data); |
| 505 | info_ptr->unknown_chunks[num].data = NULL; |
| 506 | } |
| 507 | } |
| 508 | else |
| 509 | { |
| 510 | int i; |
| 511 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 512 | if (info_ptr->unknown_chunks_num) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 513 | { |
| 514 | for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++) |
| 515 | png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i); |
| 516 | |
| 517 | png_free(png_ptr, info_ptr->unknown_chunks); |
| 518 | info_ptr->unknown_chunks = NULL; |
| 519 | info_ptr->unknown_chunks_num = 0; |
| 520 | } |
| 521 | } |
| 522 | } |
| 523 | #endif |
| 524 | |
| 525 | #if defined(PNG_hIST_SUPPORTED) |
| 526 | /* free any hIST entry */ |
| 527 | #ifdef PNG_FREE_ME_SUPPORTED |
| 528 | if ((mask & PNG_FREE_HIST) & info_ptr->free_me) |
| 529 | #else |
| 530 | if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST)) |
| 531 | #endif |
| 532 | { |
| 533 | png_free(png_ptr, info_ptr->hist); |
| 534 | info_ptr->hist = NULL; |
| 535 | info_ptr->valid &= ~PNG_INFO_hIST; |
| 536 | #ifndef PNG_FREE_ME_SUPPORTED |
| 537 | png_ptr->flags &= ~PNG_FLAG_FREE_HIST; |
| 538 | #endif |
| 539 | } |
| 540 | #endif |
| 541 | |
| 542 | /* free any PLTE entry that was internally allocated */ |
| 543 | #ifdef PNG_FREE_ME_SUPPORTED |
| 544 | if ((mask & PNG_FREE_PLTE) & info_ptr->free_me) |
| 545 | #else |
| 546 | if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE)) |
| 547 | #endif |
| 548 | { |
| 549 | png_zfree(png_ptr, info_ptr->palette); |
| 550 | info_ptr->palette = NULL; |
| 551 | info_ptr->valid &= ~PNG_INFO_PLTE; |
| 552 | #ifndef PNG_FREE_ME_SUPPORTED |
| 553 | png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; |
| 554 | #endif |
| 555 | info_ptr->num_palette = 0; |
| 556 | } |
| 557 | |
| 558 | #if defined(PNG_INFO_IMAGE_SUPPORTED) |
| 559 | /* free any image bits attached to the info structure */ |
| 560 | #ifdef PNG_FREE_ME_SUPPORTED |
| 561 | if ((mask & PNG_FREE_ROWS) & info_ptr->free_me) |
| 562 | #else |
| 563 | if (mask & PNG_FREE_ROWS) |
| 564 | #endif |
| 565 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 566 | if (info_ptr->row_pointers) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 567 | { |
| 568 | int row; |
| 569 | for (row = 0; row < (int)info_ptr->height; row++) |
| 570 | { |
| 571 | png_free(png_ptr, info_ptr->row_pointers[row]); |
| 572 | info_ptr->row_pointers[row]=NULL; |
| 573 | } |
| 574 | png_free(png_ptr, info_ptr->row_pointers); |
| 575 | info_ptr->row_pointers=NULL; |
| 576 | } |
| 577 | info_ptr->valid &= ~PNG_INFO_IDAT; |
| 578 | } |
| 579 | #endif |
| 580 | |
| 581 | #ifdef PNG_FREE_ME_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 582 | if (num == -1) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 583 | info_ptr->free_me &= ~mask; |
| 584 | else |
| 585 | info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL); |
| 586 | #endif |
| 587 | } |
| 588 | |
| 589 | /* This is an internal routine to free any memory that the info struct is |
| 590 | * pointing to before re-using it or freeing the struct itself. Recall |
| 591 | * that png_free() checks for NULL pointers for us. |
| 592 | */ |
| 593 | void /* PRIVATE */ |
| 594 | png_info_destroy(png_structp png_ptr, png_infop info_ptr) |
| 595 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 596 | png_debug(1, "in png_info_destroy"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 597 | |
| 598 | png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); |
| 599 | |
| 600 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 601 | if (png_ptr->num_chunk_list) |
| 602 | { |
| 603 | png_free(png_ptr, png_ptr->chunk_list); |
| 604 | png_ptr->chunk_list=NULL; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 605 | png_ptr->num_chunk_list = 0; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 606 | } |
| 607 | #endif |
| 608 | |
| 609 | png_info_init_3(&info_ptr, png_sizeof(png_info)); |
| 610 | } |
| 611 | #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |
| 612 | |
| 613 | /* This function returns a pointer to the io_ptr associated with the user |
| 614 | * functions. The application should free any memory associated with this |
| 615 | * pointer before png_write_destroy() or png_read_destroy() are called. |
| 616 | */ |
| 617 | png_voidp PNGAPI |
| 618 | png_get_io_ptr(png_structp png_ptr) |
| 619 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 620 | if (png_ptr == NULL) return (NULL); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 621 | return (png_ptr->io_ptr); |
| 622 | } |
| 623 | |
| 624 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| 625 | #if !defined(PNG_NO_STDIO) |
| 626 | /* Initialize the default input/output functions for the PNG file. If you |
| 627 | * use your own read or write routines, you can call either png_set_read_fn() |
| 628 | * or png_set_write_fn() instead of png_init_io(). If you have defined |
| 629 | * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't |
| 630 | * necessarily available. |
| 631 | */ |
| 632 | void PNGAPI |
| 633 | png_init_io(png_structp png_ptr, png_FILE_p fp) |
| 634 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 635 | png_debug(1, "in png_init_io"); |
| 636 | if (png_ptr == NULL) return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 637 | png_ptr->io_ptr = (png_voidp)fp; |
| 638 | } |
| 639 | #endif |
| 640 | |
| 641 | #if defined(PNG_TIME_RFC1123_SUPPORTED) |
| 642 | /* Convert the supplied time into an RFC 1123 string suitable for use in |
| 643 | * a "Creation Time" or other text-based time string. |
| 644 | */ |
| 645 | png_charp PNGAPI |
| 646 | png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime) |
| 647 | { |
| 648 | static PNG_CONST char short_months[12][4] = |
| 649 | {"Jan", "Feb", "Mar", "Apr", "May", "Jun", |
| 650 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; |
| 651 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 652 | if (png_ptr == NULL) return (NULL); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 653 | if (png_ptr->time_buffer == NULL) |
| 654 | { |
| 655 | png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29* |
| 656 | png_sizeof(char))); |
| 657 | } |
| 658 | |
| 659 | #if defined(_WIN32_WCE) |
| 660 | { |
| 661 | wchar_t time_buf[29]; |
| 662 | wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"), |
| 663 | ptime->day % 32, short_months[(ptime->month - 1) % 12], |
| 664 | ptime->year, ptime->hour % 24, ptime->minute % 60, |
| 665 | ptime->second % 61); |
| 666 | WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29, |
| 667 | NULL, NULL); |
| 668 | } |
| 669 | #else |
| 670 | #ifdef USE_FAR_KEYWORD |
| 671 | { |
| 672 | char near_time_buf[29]; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 673 | png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000", |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 674 | ptime->day % 32, short_months[(ptime->month - 1) % 12], |
| 675 | ptime->year, ptime->hour % 24, ptime->minute % 60, |
| 676 | ptime->second % 61); |
| 677 | png_memcpy(png_ptr->time_buffer, near_time_buf, |
| 678 | 29*png_sizeof(char)); |
| 679 | } |
| 680 | #else |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 681 | png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000", |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 682 | ptime->day % 32, short_months[(ptime->month - 1) % 12], |
| 683 | ptime->year, ptime->hour % 24, ptime->minute % 60, |
| 684 | ptime->second % 61); |
| 685 | #endif |
| 686 | #endif /* _WIN32_WCE */ |
| 687 | return ((png_charp)png_ptr->time_buffer); |
| 688 | } |
| 689 | #endif /* PNG_TIME_RFC1123_SUPPORTED */ |
| 690 | |
| 691 | #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |
| 692 | |
| 693 | png_charp PNGAPI |
| 694 | png_get_copyright(png_structp png_ptr) |
| 695 | { |
| 696 | png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 697 | return ((png_charp) "\n libpng version 1.2.35 - February 14, 2009\n\ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 698 | Copyright (c) 1998-2008 Glenn Randers-Pehrson\n\ |
| 699 | Copyright (c) 1996-1997 Andreas Dilger\n\ |
| 700 | Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n"); |
| 701 | } |
| 702 | |
| 703 | /* The following return the library version as a short string in the |
| 704 | * format 1.0.0 through 99.99.99zz. To get the version of *.h files |
| 705 | * used with your application, print out PNG_LIBPNG_VER_STRING, which |
| 706 | * is defined in png.h. |
| 707 | * Note: now there is no difference between png_get_libpng_ver() and |
| 708 | * png_get_header_ver(). Due to the version_nn_nn_nn typedef guard, |
| 709 | * it is guaranteed that png.c uses the correct version of png.h. |
| 710 | */ |
| 711 | png_charp PNGAPI |
| 712 | png_get_libpng_ver(png_structp png_ptr) |
| 713 | { |
| 714 | /* Version of *.c files used when building libpng */ |
| 715 | png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */ |
| 716 | return ((png_charp) PNG_LIBPNG_VER_STRING); |
| 717 | } |
| 718 | |
| 719 | png_charp PNGAPI |
| 720 | png_get_header_ver(png_structp png_ptr) |
| 721 | { |
| 722 | /* Version of *.h files used when building libpng */ |
| 723 | png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */ |
| 724 | return ((png_charp) PNG_LIBPNG_VER_STRING); |
| 725 | } |
| 726 | |
| 727 | png_charp PNGAPI |
| 728 | png_get_header_version(png_structp png_ptr) |
| 729 | { |
| 730 | /* Returns longer string containing both version and date */ |
| 731 | png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */ |
| 732 | return ((png_charp) PNG_HEADER_VERSION_STRING |
| 733 | #ifndef PNG_READ_SUPPORTED |
| 734 | " (NO READ SUPPORT)" |
| 735 | #endif |
| 736 | "\n"); |
| 737 | } |
| 738 | |
| 739 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| 740 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| 741 | int PNGAPI |
| 742 | png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name) |
| 743 | { |
| 744 | /* check chunk_name and return "keep" value if it's on the list, else 0 */ |
| 745 | int i; |
| 746 | png_bytep p; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 747 | if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 748 | return 0; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 749 | p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5; |
| 750 | for (i = png_ptr->num_chunk_list; i; i--, p -= 5) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 751 | if (!png_memcmp(chunk_name, p, 4)) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 752 | return ((int)*(p + 4)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 753 | return 0; |
| 754 | } |
| 755 | #endif |
| 756 | |
| 757 | /* This function, added to libpng-1.0.6g, is untested. */ |
| 758 | int PNGAPI |
| 759 | png_reset_zstream(png_structp png_ptr) |
| 760 | { |
| 761 | if (png_ptr == NULL) return Z_STREAM_ERROR; |
| 762 | return (inflateReset(&png_ptr->zstream)); |
| 763 | } |
| 764 | #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |
| 765 | |
| 766 | /* This function was added to libpng-1.0.7 */ |
| 767 | png_uint_32 PNGAPI |
| 768 | png_access_version_number(void) |
| 769 | { |
| 770 | /* Version of *.c files used when building libpng */ |
| 771 | return((png_uint_32) PNG_LIBPNG_VER); |
| 772 | } |
| 773 | |
| 774 | |
| 775 | #if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
| 776 | #if !defined(PNG_1_0_X) |
| 777 | /* this function was added to libpng 1.2.0 */ |
| 778 | int PNGAPI |
| 779 | png_mmx_support(void) |
| 780 | { |
| 781 | /* obsolete, to be removed from libpng-1.4.0 */ |
| 782 | return -1; |
| 783 | } |
| 784 | #endif /* PNG_1_0_X */ |
| 785 | #endif /* PNG_READ_SUPPORTED && PNG_ASSEMBLER_CODE_SUPPORTED */ |
| 786 | |
| 787 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| 788 | #ifdef PNG_SIZE_T |
| 789 | /* Added at libpng version 1.2.6 */ |
| 790 | PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); |
| 791 | png_size_t PNGAPI |
| 792 | png_convert_size(size_t size) |
| 793 | { |
| 794 | if (size > (png_size_t)-1) |
| 795 | PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */ |
| 796 | return ((png_size_t)size); |
| 797 | } |
| 798 | #endif /* PNG_SIZE_T */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame^] | 799 | |
| 800 | /* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */ |
| 801 | #if defined(PNG_cHRM_SUPPORTED) |
| 802 | #if !defined(PNG_NO_CHECK_cHRM) |
| 803 | /* |
| 804 | Multiply two 32-bit numbers, V1 and V2, using 32-bit |
| 805 | arithmetic, to produce a 64 bit result in the HI/LO words. |
| 806 | |
| 807 | A B |
| 808 | x C D |
| 809 | ------ |
| 810 | AD || BD |
| 811 | AC || CB || 0 |
| 812 | |
| 813 | where A and B are the high and low 16-bit words of V1, |
| 814 | C and D are the 16-bit words of V2, AD is the product of |
| 815 | A and D, and X || Y is (X << 16) + Y. |
| 816 | */ |
| 817 | |
| 818 | void png_64bit_product (long v1, long v2, unsigned long *hi_product, |
| 819 | unsigned long *lo_product) |
| 820 | { |
| 821 | int a, b, c, d; |
| 822 | long lo, hi, x, y; |
| 823 | |
| 824 | a = (v1 >> 16) & 0xffff; |
| 825 | b = v1 & 0xffff; |
| 826 | c = (v2 >> 16) & 0xffff; |
| 827 | d = v2 & 0xffff; |
| 828 | |
| 829 | lo = b * d; /* BD */ |
| 830 | x = a * d + c * b; /* AD + CB */ |
| 831 | y = ((lo >> 16) & 0xffff) + x; |
| 832 | |
| 833 | lo = (lo & 0xffff) | ((y & 0xffff) << 16); |
| 834 | hi = (y >> 16) & 0xffff; |
| 835 | |
| 836 | hi += a * c; /* AC */ |
| 837 | |
| 838 | *hi_product = (unsigned long)hi; |
| 839 | *lo_product = (unsigned long)lo; |
| 840 | } |
| 841 | int /* private */ |
| 842 | png_check_cHRM_fixed(png_structp png_ptr, |
| 843 | png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, |
| 844 | png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, |
| 845 | png_fixed_point blue_x, png_fixed_point blue_y) |
| 846 | { |
| 847 | int ret = 1; |
| 848 | unsigned long xy_hi,xy_lo,yx_hi,yx_lo; |
| 849 | |
| 850 | png_debug(1, "in function png_check_cHRM_fixed"); |
| 851 | if (png_ptr == NULL) |
| 852 | return 0; |
| 853 | |
| 854 | if (white_x < 0 || white_y <= 0 || |
| 855 | red_x < 0 || red_y < 0 || |
| 856 | green_x < 0 || green_y < 0 || |
| 857 | blue_x < 0 || blue_y < 0) |
| 858 | { |
| 859 | png_warning(png_ptr, |
| 860 | "Ignoring attempt to set negative chromaticity value"); |
| 861 | ret = 0; |
| 862 | } |
| 863 | if (white_x > (png_fixed_point) PNG_UINT_31_MAX || |
| 864 | white_y > (png_fixed_point) PNG_UINT_31_MAX || |
| 865 | red_x > (png_fixed_point) PNG_UINT_31_MAX || |
| 866 | red_y > (png_fixed_point) PNG_UINT_31_MAX || |
| 867 | green_x > (png_fixed_point) PNG_UINT_31_MAX || |
| 868 | green_y > (png_fixed_point) PNG_UINT_31_MAX || |
| 869 | blue_x > (png_fixed_point) PNG_UINT_31_MAX || |
| 870 | blue_y > (png_fixed_point) PNG_UINT_31_MAX ) |
| 871 | { |
| 872 | png_warning(png_ptr, |
| 873 | "Ignoring attempt to set chromaticity value exceeding 21474.83"); |
| 874 | ret = 0; |
| 875 | } |
| 876 | if (white_x > 100000L - white_y) |
| 877 | { |
| 878 | png_warning(png_ptr, "Invalid cHRM white point"); |
| 879 | ret = 0; |
| 880 | } |
| 881 | if (red_x > 100000L - red_y) |
| 882 | { |
| 883 | png_warning(png_ptr, "Invalid cHRM red point"); |
| 884 | ret = 0; |
| 885 | } |
| 886 | if (green_x > 100000L - green_y) |
| 887 | { |
| 888 | png_warning(png_ptr, "Invalid cHRM green point"); |
| 889 | ret = 0; |
| 890 | } |
| 891 | if (blue_x > 100000L - blue_y) |
| 892 | { |
| 893 | png_warning(png_ptr, "Invalid cHRM blue point"); |
| 894 | ret = 0; |
| 895 | } |
| 896 | |
| 897 | png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo); |
| 898 | png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo); |
| 899 | |
| 900 | if (xy_hi == yx_hi && xy_lo == yx_lo) |
| 901 | { |
| 902 | png_warning(png_ptr, |
| 903 | "Ignoring attempt to set cHRM RGB triangle with zero area"); |
| 904 | ret = 0; |
| 905 | } |
| 906 | |
| 907 | return ret; |
| 908 | } |
| 909 | #endif /* NO_PNG_CHECK_cHRM */ |
| 910 | #endif /* PNG_cHRM_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 911 | #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |