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| 1 /* -*- mode: C; c-file-style: "gnu" -*- */ | |
| 2 /* xdgmimemagic.: Private file. Datastructure for storing magic files. | |
| 3 * | |
| 4 * More info can be found at http://www.freedesktop.org/standards/ | |
| 5 * | |
| 6 * Copyright (C) 2003 Red Hat, Inc. | |
| 7 * Copyright (C) 2003 Jonathan Blandford <jrb@alum.mit.edu> | |
| 8 * | |
| 9 * Licensed under the Academic Free License version 2.0 | |
| 10 * Or under the following terms: | |
| 11 * | |
| 12 * This library is free software; you can redistribute it and/or | |
| 13 * modify it under the terms of the GNU Lesser General Public | |
| 14 * License as published by the Free Software Foundation; either | |
| 15 * version 2 of the License, or (at your option) any later version. | |
| 16 * | |
| 17 * This library is distributed in the hope that it will be useful, | |
| 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 20 * Lesser General Public License for more details. | |
| 21 * | |
| 22 * You should have received a copy of the GNU Lesser General Public | |
| 23 * License along with this library; if not, write to the | |
| 24 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 25 * Boston, MA 02111-1307, USA. | |
| 26 */ | |
| 27 | |
| 28 #ifdef HAVE_CONFIG_H | |
| 29 #include <config.h> | |
| 30 #endif | |
| 31 | |
| 32 #include <assert.h> | |
| 33 #include "xdgmimemagic.h" | |
| 34 #include "xdgmimeint.h" | |
| 35 #include <stdio.h> | |
| 36 #include <stdlib.h> | |
| 37 #include <string.h> | |
| 38 #include <ctype.h> | |
| 39 #include <errno.h> | |
| 40 #include <limits.h> | |
| 41 | |
| 42 #ifndef FALSE | |
| 43 #define FALSE (0) | |
| 44 #endif | |
| 45 | |
| 46 #ifndef TRUE | |
| 47 #define TRUE (!FALSE) | |
| 48 #endif | |
| 49 | |
| 50 #if !defined getc_unlocked && !defined HAVE_GETC_UNLOCKED | |
| 51 # define getc_unlocked(fp) getc (fp) | |
| 52 #endif | |
| 53 | |
| 54 typedef struct XdgMimeMagicMatch XdgMimeMagicMatch; | |
| 55 typedef struct XdgMimeMagicMatchlet XdgMimeMagicMatchlet; | |
| 56 | |
| 57 typedef enum | |
| 58 { | |
| 59 XDG_MIME_MAGIC_SECTION, | |
| 60 XDG_MIME_MAGIC_MAGIC, | |
| 61 XDG_MIME_MAGIC_ERROR, | |
| 62 XDG_MIME_MAGIC_EOF | |
| 63 } XdgMimeMagicState; | |
| 64 | |
| 65 struct XdgMimeMagicMatch | |
| 66 { | |
| 67 const char *mime_type; | |
| 68 int priority; | |
| 69 XdgMimeMagicMatchlet *matchlet; | |
| 70 XdgMimeMagicMatch *next; | |
| 71 }; | |
| 72 | |
| 73 | |
| 74 struct XdgMimeMagicMatchlet | |
| 75 { | |
| 76 int indent; | |
| 77 int offset; | |
| 78 unsigned int value_length; | |
| 79 unsigned char *value; | |
| 80 unsigned char *mask; | |
| 81 unsigned int range_length; | |
| 82 unsigned int word_size; | |
| 83 XdgMimeMagicMatchlet *next; | |
| 84 }; | |
| 85 | |
| 86 | |
| 87 struct XdgMimeMagic | |
| 88 { | |
| 89 XdgMimeMagicMatch *match_list; | |
| 90 int max_extent; | |
| 91 }; | |
| 92 | |
| 93 static XdgMimeMagicMatch * | |
| 94 _xdg_mime_magic_match_new (void) | |
| 95 { | |
| 96 return calloc (1, sizeof (XdgMimeMagicMatch)); | |
| 97 } | |
| 98 | |
| 99 | |
| 100 static XdgMimeMagicMatchlet * | |
| 101 _xdg_mime_magic_matchlet_new (void) | |
| 102 { | |
| 103 XdgMimeMagicMatchlet *matchlet; | |
| 104 | |
| 105 matchlet = malloc (sizeof (XdgMimeMagicMatchlet)); | |
| 106 | |
| 107 matchlet->indent = 0; | |
| 108 matchlet->offset = 0; | |
| 109 matchlet->value_length = 0; | |
| 110 matchlet->value = NULL; | |
| 111 matchlet->mask = NULL; | |
| 112 matchlet->range_length = 1; | |
| 113 matchlet->word_size = 1; | |
| 114 matchlet->next = NULL; | |
| 115 | |
| 116 return matchlet; | |
| 117 } | |
| 118 | |
| 119 | |
| 120 static void | |
| 121 _xdg_mime_magic_matchlet_free (XdgMimeMagicMatchlet *mime_magic_matchlet) | |
| 122 { | |
| 123 if (mime_magic_matchlet) | |
| 124 { | |
| 125 if (mime_magic_matchlet->next) | |
| 126 _xdg_mime_magic_matchlet_free (mime_magic_matchlet->next); | |
| 127 if (mime_magic_matchlet->value) | |
| 128 free (mime_magic_matchlet->value); | |
| 129 if (mime_magic_matchlet->mask) | |
| 130 free (mime_magic_matchlet->mask); | |
| 131 free (mime_magic_matchlet); | |
| 132 } | |
| 133 } | |
| 134 | |
| 135 | |
| 136 /* Frees mime_magic_match and the remainder of its list | |
| 137 */ | |
| 138 static void | |
| 139 _xdg_mime_magic_match_free (XdgMimeMagicMatch *mime_magic_match) | |
| 140 { | |
| 141 XdgMimeMagicMatch *ptr, *next; | |
| 142 | |
| 143 ptr = mime_magic_match; | |
| 144 while (ptr) | |
| 145 { | |
| 146 next = ptr->next; | |
| 147 | |
| 148 if (ptr->mime_type) | |
| 149 free ((void *) ptr->mime_type); | |
| 150 if (ptr->matchlet) | |
| 151 _xdg_mime_magic_matchlet_free (ptr->matchlet); | |
| 152 free (ptr); | |
| 153 | |
| 154 ptr = next; | |
| 155 } | |
| 156 } | |
| 157 | |
| 158 /* Reads in a hunk of data until a newline character or a '\000' is hit. The | |
| 159 * returned string is null terminated, and doesn't include the newline. | |
| 160 */ | |
| 161 static unsigned char * | |
| 162 _xdg_mime_magic_read_to_newline (FILE *magic_file, | |
| 163 int *end_of_file) | |
| 164 { | |
| 165 unsigned char *retval; | |
| 166 int c; | |
| 167 int len, pos; | |
| 168 | |
| 169 len = 128; | |
| 170 pos = 0; | |
| 171 retval = malloc (len); | |
| 172 *end_of_file = FALSE; | |
| 173 | |
| 174 while (TRUE) | |
| 175 { | |
| 176 c = getc_unlocked (magic_file); | |
| 177 if (c == EOF) | |
| 178 { | |
| 179 *end_of_file = TRUE; | |
| 180 break; | |
| 181 } | |
| 182 if (c == '\n' || c == '\000') | |
| 183 break; | |
| 184 retval[pos++] = (unsigned char) c; | |
| 185 if (pos % 128 == 127) | |
| 186 { | |
| 187 len = len + 128; | |
| 188 retval = realloc (retval, len); | |
| 189 } | |
| 190 } | |
| 191 | |
| 192 retval[pos] = '\000'; | |
| 193 return retval; | |
| 194 } | |
| 195 | |
| 196 /* Returns the number read from the file, or -1 if no number could be read. | |
| 197 */ | |
| 198 static int | |
| 199 _xdg_mime_magic_read_a_number (FILE *magic_file, | |
| 200 int *end_of_file) | |
| 201 { | |
| 202 /* LONG_MAX is about 20 characters on my system */ | |
| 203 #define MAX_NUMBER_SIZE 30 | |
| 204 char number_string[MAX_NUMBER_SIZE + 1]; | |
| 205 int pos = 0; | |
| 206 int c; | |
| 207 long retval = -1; | |
| 208 | |
| 209 while (TRUE) | |
| 210 { | |
| 211 c = getc_unlocked (magic_file); | |
| 212 | |
| 213 if (c == EOF) | |
| 214 { | |
| 215 *end_of_file = TRUE; | |
| 216 break; | |
| 217 } | |
| 218 if (! isdigit (c)) | |
| 219 { | |
| 220 ungetc (c, magic_file); | |
| 221 break; | |
| 222 } | |
| 223 number_string[pos] = (char) c; | |
| 224 pos++; | |
| 225 if (pos == MAX_NUMBER_SIZE) | |
| 226 break; | |
| 227 } | |
| 228 if (pos > 0) | |
| 229 { | |
| 230 number_string[pos] = '\000'; | |
| 231 errno = 0; | |
| 232 retval = strtol (number_string, NULL, 10); | |
| 233 | |
| 234 if ((retval < INT_MIN) || (retval > INT_MAX) || (errno != 0)) | |
| 235 return -1; | |
| 236 } | |
| 237 | |
| 238 return retval; | |
| 239 } | |
| 240 | |
| 241 /* Headers are of the format: | |
| 242 * [<priority>:<mime-type>] | |
| 243 */ | |
| 244 static XdgMimeMagicState | |
| 245 _xdg_mime_magic_parse_header (FILE *magic_file, XdgMimeMagicMatch *match) | |
| 246 { | |
| 247 int c; | |
| 248 char *buffer; | |
| 249 char *end_ptr; | |
| 250 int end_of_file = 0; | |
| 251 | |
| 252 assert (magic_file != NULL); | |
| 253 assert (match != NULL); | |
| 254 | |
| 255 c = getc_unlocked (magic_file); | |
| 256 if (c == EOF) | |
| 257 return XDG_MIME_MAGIC_EOF; | |
| 258 if (c != '[') | |
| 259 return XDG_MIME_MAGIC_ERROR; | |
| 260 | |
| 261 match->priority = _xdg_mime_magic_read_a_number (magic_file, &end_of_file); | |
| 262 if (end_of_file) | |
| 263 return XDG_MIME_MAGIC_EOF; | |
| 264 if (match->priority == -1) | |
| 265 return XDG_MIME_MAGIC_ERROR; | |
| 266 | |
| 267 c = getc_unlocked (magic_file); | |
| 268 if (c == EOF) | |
| 269 return XDG_MIME_MAGIC_EOF; | |
| 270 if (c != ':') | |
| 271 return XDG_MIME_MAGIC_ERROR; | |
| 272 | |
| 273 buffer = (char *)_xdg_mime_magic_read_to_newline (magic_file, &end_of_file); | |
| 274 if (end_of_file) | |
| 275 return XDG_MIME_MAGIC_EOF; | |
| 276 | |
| 277 end_ptr = buffer; | |
| 278 while (*end_ptr != ']' && *end_ptr != '\000' && *end_ptr != '\n') | |
| 279 end_ptr++; | |
| 280 if (*end_ptr != ']') | |
| 281 { | |
| 282 free (buffer); | |
| 283 return XDG_MIME_MAGIC_ERROR; | |
| 284 } | |
| 285 *end_ptr = '\000'; | |
| 286 | |
| 287 match->mime_type = strdup (buffer); | |
| 288 free (buffer); | |
| 289 | |
| 290 return XDG_MIME_MAGIC_MAGIC; | |
| 291 } | |
| 292 | |
| 293 static XdgMimeMagicState | |
| 294 _xdg_mime_magic_parse_error (FILE *magic_file) | |
| 295 { | |
| 296 int c; | |
| 297 | |
| 298 while (1) | |
| 299 { | |
| 300 c = getc_unlocked (magic_file); | |
| 301 if (c == EOF) | |
| 302 return XDG_MIME_MAGIC_EOF; | |
| 303 if (c == '\n') | |
| 304 return XDG_MIME_MAGIC_SECTION; | |
| 305 } | |
| 306 } | |
| 307 | |
| 308 /* Headers are of the format: | |
| 309 * [ indent ] ">" start-offset "=" value | |
| 310 * [ "&" mask ] [ "~" word-size ] [ "+" range-length ] "\n" | |
| 311 */ | |
| 312 static XdgMimeMagicState | |
| 313 _xdg_mime_magic_parse_magic_line (FILE *magic_file, | |
| 314 XdgMimeMagicMatch *match) | |
| 315 { | |
| 316 XdgMimeMagicMatchlet *matchlet; | |
| 317 int c; | |
| 318 int end_of_file; | |
| 319 int indent = 0; | |
| 320 int bytes_read; | |
| 321 | |
| 322 assert (magic_file != NULL); | |
| 323 | |
| 324 /* Sniff the buffer to make sure it's a valid line */ | |
| 325 c = getc_unlocked (magic_file); | |
| 326 if (c == EOF) | |
| 327 return XDG_MIME_MAGIC_EOF; | |
| 328 else if (c == '[') | |
| 329 { | |
| 330 ungetc (c, magic_file); | |
| 331 return XDG_MIME_MAGIC_SECTION; | |
| 332 } | |
| 333 else if (c == '\n') | |
| 334 return XDG_MIME_MAGIC_MAGIC; | |
| 335 | |
| 336 /* At this point, it must be a digit or a '>' */ | |
| 337 end_of_file = FALSE; | |
| 338 if (isdigit (c)) | |
| 339 { | |
| 340 ungetc (c, magic_file); | |
| 341 indent = _xdg_mime_magic_read_a_number (magic_file, &end_of_file); | |
| 342 if (end_of_file) | |
| 343 return XDG_MIME_MAGIC_EOF; | |
| 344 if (indent == -1) | |
| 345 return XDG_MIME_MAGIC_ERROR; | |
| 346 c = getc_unlocked (magic_file); | |
| 347 if (c == EOF) | |
| 348 return XDG_MIME_MAGIC_EOF; | |
| 349 } | |
| 350 | |
| 351 if (c != '>') | |
| 352 return XDG_MIME_MAGIC_ERROR; | |
| 353 | |
| 354 matchlet = _xdg_mime_magic_matchlet_new (); | |
| 355 matchlet->indent = indent; | |
| 356 matchlet->offset = _xdg_mime_magic_read_a_number (magic_file, &end_of_file); | |
| 357 if (end_of_file) | |
| 358 { | |
| 359 _xdg_mime_magic_matchlet_free (matchlet); | |
| 360 return XDG_MIME_MAGIC_EOF; | |
| 361 } | |
| 362 if (matchlet->offset == -1) | |
| 363 { | |
| 364 _xdg_mime_magic_matchlet_free (matchlet); | |
| 365 return XDG_MIME_MAGIC_ERROR; | |
| 366 } | |
| 367 c = getc_unlocked (magic_file); | |
| 368 if (c == EOF) | |
| 369 { | |
| 370 _xdg_mime_magic_matchlet_free (matchlet); | |
| 371 return XDG_MIME_MAGIC_EOF; | |
| 372 } | |
| 373 else if (c != '=') | |
| 374 { | |
| 375 _xdg_mime_magic_matchlet_free (matchlet); | |
| 376 return XDG_MIME_MAGIC_ERROR; | |
| 377 } | |
| 378 | |
| 379 /* Next two bytes determine how long the value is */ | |
| 380 matchlet->value_length = 0; | |
| 381 c = getc_unlocked (magic_file); | |
| 382 if (c == EOF) | |
| 383 { | |
| 384 _xdg_mime_magic_matchlet_free (matchlet); | |
| 385 return XDG_MIME_MAGIC_EOF; | |
| 386 } | |
| 387 matchlet->value_length = c & 0xFF; | |
| 388 matchlet->value_length = matchlet->value_length << 8; | |
| 389 | |
| 390 c = getc_unlocked (magic_file); | |
| 391 if (c == EOF) | |
| 392 { | |
| 393 _xdg_mime_magic_matchlet_free (matchlet); | |
| 394 return XDG_MIME_MAGIC_EOF; | |
| 395 } | |
| 396 matchlet->value_length = matchlet->value_length + (c & 0xFF); | |
| 397 | |
| 398 matchlet->value = malloc (matchlet->value_length); | |
| 399 | |
| 400 /* OOM */ | |
| 401 if (matchlet->value == NULL) | |
| 402 { | |
| 403 _xdg_mime_magic_matchlet_free (matchlet); | |
| 404 return XDG_MIME_MAGIC_ERROR; | |
| 405 } | |
| 406 bytes_read = fread (matchlet->value, 1, matchlet->value_length, magic_file); | |
| 407 if (bytes_read != matchlet->value_length) | |
| 408 { | |
| 409 _xdg_mime_magic_matchlet_free (matchlet); | |
| 410 if (feof (magic_file)) | |
| 411 return XDG_MIME_MAGIC_EOF; | |
| 412 else | |
| 413 return XDG_MIME_MAGIC_ERROR; | |
| 414 } | |
| 415 | |
| 416 c = getc_unlocked (magic_file); | |
| 417 if (c == '&') | |
| 418 { | |
| 419 matchlet->mask = malloc (matchlet->value_length); | |
| 420 /* OOM */ | |
| 421 if (matchlet->mask == NULL) | |
| 422 { | |
| 423 _xdg_mime_magic_matchlet_free (matchlet); | |
| 424 return XDG_MIME_MAGIC_ERROR; | |
| 425 } | |
| 426 bytes_read = fread (matchlet->mask, 1, matchlet->value_length, magic_file)
; | |
| 427 if (bytes_read != matchlet->value_length) | |
| 428 { | |
| 429 _xdg_mime_magic_matchlet_free (matchlet); | |
| 430 if (feof (magic_file)) | |
| 431 return XDG_MIME_MAGIC_EOF; | |
| 432 else | |
| 433 return XDG_MIME_MAGIC_ERROR; | |
| 434 } | |
| 435 c = getc_unlocked (magic_file); | |
| 436 } | |
| 437 | |
| 438 if (c == '~') | |
| 439 { | |
| 440 matchlet->word_size = _xdg_mime_magic_read_a_number (magic_file, &end_of_f
ile); | |
| 441 if (end_of_file) | |
| 442 { | |
| 443 _xdg_mime_magic_matchlet_free (matchlet); | |
| 444 return XDG_MIME_MAGIC_EOF; | |
| 445 } | |
| 446 if (matchlet->word_size != 0 && | |
| 447 matchlet->word_size != 1 && | |
| 448 matchlet->word_size != 2 && | |
| 449 matchlet->word_size != 4) | |
| 450 { | |
| 451 _xdg_mime_magic_matchlet_free (matchlet); | |
| 452 return XDG_MIME_MAGIC_ERROR; | |
| 453 } | |
| 454 c = getc_unlocked (magic_file); | |
| 455 } | |
| 456 | |
| 457 if (c == '+') | |
| 458 { | |
| 459 matchlet->range_length = _xdg_mime_magic_read_a_number (magic_file, &end_o
f_file); | |
| 460 if (end_of_file) | |
| 461 { | |
| 462 _xdg_mime_magic_matchlet_free (matchlet); | |
| 463 return XDG_MIME_MAGIC_EOF; | |
| 464 } | |
| 465 if (matchlet->range_length == -1) | |
| 466 { | |
| 467 _xdg_mime_magic_matchlet_free (matchlet); | |
| 468 return XDG_MIME_MAGIC_ERROR; | |
| 469 } | |
| 470 c = getc_unlocked (magic_file); | |
| 471 } | |
| 472 | |
| 473 | |
| 474 if (c == '\n') | |
| 475 { | |
| 476 /* We clean up the matchlet, byte swapping if needed */ | |
| 477 if (matchlet->word_size > 1) | |
| 478 { | |
| 479 int i; | |
| 480 if (matchlet->value_length % matchlet->word_size != 0) | |
| 481 { | |
| 482 _xdg_mime_magic_matchlet_free (matchlet); | |
| 483 return XDG_MIME_MAGIC_ERROR; | |
| 484 } | |
| 485 /* FIXME: need to get this defined in a <config.h> style file */ | |
| 486 #if LITTLE_ENDIAN | |
| 487 for (i = 0; i < matchlet->value_length; i = i + matchlet->word_size) | |
| 488 { | |
| 489 if (matchlet->word_size == 2) | |
| 490 *((xdg_uint16_t *) matchlet->value + i) = SWAP_BE16_TO_LE16 (*((
xdg_uint16_t *) (matchlet->value + i))); | |
| 491 else if (matchlet->word_size == 4) | |
| 492 *((xdg_uint32_t *) matchlet->value + i) = SWAP_BE32_TO_LE32 (*((
xdg_uint32_t *) (matchlet->value + i))); | |
| 493 if (matchlet->mask) | |
| 494 { | |
| 495 if (matchlet->word_size == 2) | |
| 496 *((xdg_uint16_t *) matchlet->mask + i) = SWAP_BE16_TO_LE16 (
*((xdg_uint16_t *) (matchlet->mask + i))); | |
| 497 else if (matchlet->word_size == 4) | |
| 498 *((xdg_uint32_t *) matchlet->mask + i) = SWAP_BE32_TO_LE32 (
*((xdg_uint32_t *) (matchlet->mask + i))); | |
| 499 | |
| 500 } | |
| 501 } | |
| 502 #endif | |
| 503 } | |
| 504 | |
| 505 matchlet->next = match->matchlet; | |
| 506 match->matchlet = matchlet; | |
| 507 | |
| 508 | |
| 509 return XDG_MIME_MAGIC_MAGIC; | |
| 510 } | |
| 511 | |
| 512 _xdg_mime_magic_matchlet_free (matchlet); | |
| 513 if (c == EOF) | |
| 514 return XDG_MIME_MAGIC_EOF; | |
| 515 | |
| 516 return XDG_MIME_MAGIC_ERROR; | |
| 517 } | |
| 518 | |
| 519 static int | |
| 520 _xdg_mime_magic_matchlet_compare_to_data (XdgMimeMagicMatchlet *matchlet, | |
| 521 const void *data, | |
| 522 size_t len) | |
| 523 { | |
| 524 int i, j; | |
| 525 for (i = matchlet->offset; i < matchlet->offset + matchlet->range_length; i++) | |
| 526 { | |
| 527 int valid_matchlet = TRUE; | |
| 528 | |
| 529 if (i + matchlet->value_length > len) | |
| 530 return FALSE; | |
| 531 | |
| 532 if (matchlet->mask) | |
| 533 { | |
| 534 for (j = 0; j < matchlet->value_length; j++) | |
| 535 { | |
| 536 if ((matchlet->value[j] & matchlet->mask[j]) != | |
| 537 ((((unsigned char *) data)[j + i]) & matchlet->mask[j])) | |
| 538 { | |
| 539 valid_matchlet = FALSE; | |
| 540 break; | |
| 541 } | |
| 542 } | |
| 543 } | |
| 544 else | |
| 545 { | |
| 546 for (j = 0; j < matchlet->value_length; j++) | |
| 547 { | |
| 548 if (matchlet->value[j] != ((unsigned char *) data)[j + i]) | |
| 549 { | |
| 550 valid_matchlet = FALSE; | |
| 551 break; | |
| 552 } | |
| 553 } | |
| 554 } | |
| 555 if (valid_matchlet) | |
| 556 return TRUE; | |
| 557 } | |
| 558 return FALSE; | |
| 559 } | |
| 560 | |
| 561 static int | |
| 562 _xdg_mime_magic_matchlet_compare_level (XdgMimeMagicMatchlet *matchlet, | |
| 563 const void *data, | |
| 564 size_t len, | |
| 565 int indent) | |
| 566 { | |
| 567 while ((matchlet != NULL) && (matchlet->indent == indent)) | |
| 568 { | |
| 569 if (_xdg_mime_magic_matchlet_compare_to_data (matchlet, data, len)) | |
| 570 { | |
| 571 if ((matchlet->next == NULL) || | |
| 572 (matchlet->next->indent <= indent)) | |
| 573 return TRUE; | |
| 574 | |
| 575 if (_xdg_mime_magic_matchlet_compare_level (matchlet->next, | |
| 576 data, | |
| 577 len, | |
| 578 indent + 1)) | |
| 579 return TRUE; | |
| 580 } | |
| 581 | |
| 582 do | |
| 583 { | |
| 584 matchlet = matchlet->next; | |
| 585 } | |
| 586 while (matchlet && matchlet->indent > indent); | |
| 587 } | |
| 588 | |
| 589 return FALSE; | |
| 590 } | |
| 591 | |
| 592 static int | |
| 593 _xdg_mime_magic_match_compare_to_data (XdgMimeMagicMatch *match, | |
| 594 const void *data, | |
| 595 size_t len) | |
| 596 { | |
| 597 return _xdg_mime_magic_matchlet_compare_level (match->matchlet, data, len, 0); | |
| 598 } | |
| 599 | |
| 600 static void | |
| 601 _xdg_mime_magic_insert_match (XdgMimeMagic *mime_magic, | |
| 602 XdgMimeMagicMatch *match) | |
| 603 { | |
| 604 XdgMimeMagicMatch *list; | |
| 605 | |
| 606 if (mime_magic->match_list == NULL) | |
| 607 { | |
| 608 mime_magic->match_list = match; | |
| 609 return; | |
| 610 } | |
| 611 | |
| 612 if (match->priority > mime_magic->match_list->priority) | |
| 613 { | |
| 614 match->next = mime_magic->match_list; | |
| 615 mime_magic->match_list = match; | |
| 616 return; | |
| 617 } | |
| 618 | |
| 619 list = mime_magic->match_list; | |
| 620 while (list->next != NULL) | |
| 621 { | |
| 622 if (list->next->priority < match->priority) | |
| 623 { | |
| 624 match->next = list->next; | |
| 625 list->next = match; | |
| 626 return; | |
| 627 } | |
| 628 list = list->next; | |
| 629 } | |
| 630 list->next = match; | |
| 631 match->next = NULL; | |
| 632 } | |
| 633 | |
| 634 XdgMimeMagic * | |
| 635 _xdg_mime_magic_new (void) | |
| 636 { | |
| 637 return calloc (1, sizeof (XdgMimeMagic)); | |
| 638 } | |
| 639 | |
| 640 void | |
| 641 _xdg_mime_magic_free (XdgMimeMagic *mime_magic) | |
| 642 { | |
| 643 if (mime_magic) { | |
| 644 _xdg_mime_magic_match_free (mime_magic->match_list); | |
| 645 free (mime_magic); | |
| 646 } | |
| 647 } | |
| 648 | |
| 649 int | |
| 650 _xdg_mime_magic_get_buffer_extents (XdgMimeMagic *mime_magic) | |
| 651 { | |
| 652 return mime_magic->max_extent; | |
| 653 } | |
| 654 | |
| 655 const char * | |
| 656 _xdg_mime_magic_lookup_data (XdgMimeMagic *mime_magic, | |
| 657 const void *data, | |
| 658 size_t len, | |
| 659 int *result_prio, | |
| 660 const char *mime_types[], | |
| 661 int n_mime_types) | |
| 662 { | |
| 663 XdgMimeMagicMatch *match; | |
| 664 const char *mime_type; | |
| 665 int n; | |
| 666 int prio; | |
| 667 | |
| 668 prio = 0; | |
| 669 mime_type = NULL; | |
| 670 for (match = mime_magic->match_list; match; match = match->next) | |
| 671 { | |
| 672 if (_xdg_mime_magic_match_compare_to_data (match, data, len)) | |
| 673 { | |
| 674 prio = match->priority; | |
| 675 mime_type = match->mime_type; | |
| 676 break; | |
| 677 } | |
| 678 else | |
| 679 { | |
| 680 for (n = 0; n < n_mime_types; n++) | |
| 681 { | |
| 682 if (mime_types[n] && | |
| 683 _xdg_mime_mime_type_equal (mime_types[n], match->mime_type)) | |
| 684 mime_types[n] = NULL; | |
| 685 } | |
| 686 } | |
| 687 } | |
| 688 | |
| 689 if (mime_type == NULL) | |
| 690 { | |
| 691 for (n = 0; n < n_mime_types; n++) | |
| 692 { | |
| 693 if (mime_types[n]) | |
| 694 mime_type = mime_types[n]; | |
| 695 } | |
| 696 } | |
| 697 | |
| 698 if (result_prio) | |
| 699 *result_prio = prio; | |
| 700 | |
| 701 return mime_type; | |
| 702 } | |
| 703 | |
| 704 static void | |
| 705 _xdg_mime_update_mime_magic_extents (XdgMimeMagic *mime_magic) | |
| 706 { | |
| 707 XdgMimeMagicMatch *match; | |
| 708 int max_extent = 0; | |
| 709 | |
| 710 for (match = mime_magic->match_list; match; match = match->next) | |
| 711 { | |
| 712 XdgMimeMagicMatchlet *matchlet; | |
| 713 | |
| 714 for (matchlet = match->matchlet; matchlet; matchlet = matchlet->next) | |
| 715 { | |
| 716 int extent; | |
| 717 | |
| 718 extent = matchlet->value_length + matchlet->offset + matchlet->range_l
ength; | |
| 719 if (max_extent < extent) | |
| 720 max_extent = extent; | |
| 721 } | |
| 722 } | |
| 723 | |
| 724 mime_magic->max_extent = max_extent; | |
| 725 } | |
| 726 | |
| 727 static XdgMimeMagicMatchlet * | |
| 728 _xdg_mime_magic_matchlet_mirror (XdgMimeMagicMatchlet *matchlets) | |
| 729 { | |
| 730 XdgMimeMagicMatchlet *new_list; | |
| 731 XdgMimeMagicMatchlet *tmp; | |
| 732 | |
| 733 if ((matchlets == NULL) || (matchlets->next == NULL)) | |
| 734 return matchlets; | |
| 735 | |
| 736 new_list = NULL; | |
| 737 tmp = matchlets; | |
| 738 while (tmp != NULL) | |
| 739 { | |
| 740 XdgMimeMagicMatchlet *matchlet; | |
| 741 | |
| 742 matchlet = tmp; | |
| 743 tmp = tmp->next; | |
| 744 matchlet->next = new_list; | |
| 745 new_list = matchlet; | |
| 746 } | |
| 747 | |
| 748 return new_list; | |
| 749 | |
| 750 } | |
| 751 | |
| 752 static void | |
| 753 _xdg_mime_magic_read_magic_file (XdgMimeMagic *mime_magic, | |
| 754 FILE *magic_file) | |
| 755 { | |
| 756 XdgMimeMagicState state; | |
| 757 XdgMimeMagicMatch *match = NULL; /* Quiet compiler */ | |
| 758 | |
| 759 state = XDG_MIME_MAGIC_SECTION; | |
| 760 | |
| 761 while (state != XDG_MIME_MAGIC_EOF) | |
| 762 { | |
| 763 switch (state) | |
| 764 { | |
| 765 case XDG_MIME_MAGIC_SECTION: | |
| 766 match = _xdg_mime_magic_match_new (); | |
| 767 state = _xdg_mime_magic_parse_header (magic_file, match); | |
| 768 if (state == XDG_MIME_MAGIC_EOF || state == XDG_MIME_MAGIC_ERROR) | |
| 769 _xdg_mime_magic_match_free (match); | |
| 770 break; | |
| 771 case XDG_MIME_MAGIC_MAGIC: | |
| 772 state = _xdg_mime_magic_parse_magic_line (magic_file, match); | |
| 773 if (state == XDG_MIME_MAGIC_SECTION || | |
| 774 (state == XDG_MIME_MAGIC_EOF && match->mime_type)) | |
| 775 { | |
| 776 match->matchlet = _xdg_mime_magic_matchlet_mirror (match->matchlet
); | |
| 777 _xdg_mime_magic_insert_match (mime_magic, match); | |
| 778 } | |
| 779 else if (state == XDG_MIME_MAGIC_EOF || state == XDG_MIME_MAGIC_ERROR) | |
| 780 _xdg_mime_magic_match_free (match); | |
| 781 break; | |
| 782 case XDG_MIME_MAGIC_ERROR: | |
| 783 state = _xdg_mime_magic_parse_error (magic_file); | |
| 784 break; | |
| 785 case XDG_MIME_MAGIC_EOF: | |
| 786 default: | |
| 787 /* Make the compiler happy */ | |
| 788 assert (0); | |
| 789 } | |
| 790 } | |
| 791 _xdg_mime_update_mime_magic_extents (mime_magic); | |
| 792 } | |
| 793 | |
| 794 void | |
| 795 _xdg_mime_magic_read_from_file (XdgMimeMagic *mime_magic, | |
| 796 const char *file_name) | |
| 797 { | |
| 798 FILE *magic_file; | |
| 799 char header[12]; | |
| 800 | |
| 801 magic_file = fopen (file_name, "r"); | |
| 802 | |
| 803 if (magic_file == NULL) | |
| 804 return; | |
| 805 | |
| 806 if (fread (header, 1, 12, magic_file) == 12) | |
| 807 { | |
| 808 if (memcmp ("MIME-Magic\0\n", header, 12) == 0) | |
| 809 _xdg_mime_magic_read_magic_file (mime_magic, magic_file); | |
| 810 } | |
| 811 | |
| 812 fclose (magic_file); | |
| 813 } | |
| OLD | NEW |
|---|
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