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   1 /*
   2  * wim.c - Stuff that doesn't fit into any other file
   3  */
   4
   5 /*
   6  * Copyright (C) 2012, 2013 Eric Biggers
   7  *
   8  * wimlib - Library for working with WIM files
   9  *
  10  * This file is part of wimlib, a library for working with WIM files.
  11  *
  12  * wimlib is free software; you can redistribute it and/or modify it under the
  13  * terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 3 of the License, or (at your option)
  15  * any later version.
  16  *
  17  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  18  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  19  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <errno.h>
  29 #include <fcntl.h>
  30 #include <limits.h>
  31 #include <stdarg.h>
  32 #include <stdlib.h>
  33 #include <unistd.h>
  34
  35 #ifdef WITH_NTFS_3G
  36 #  include <time.h>
  37 #  include <ntfs-3g/volume.h>
  38 #endif
  39
  40 #ifdef __WIN32__
  41 #  include "win32.h"
  42 #else
  43 #  include <langinfo.h>
  44 #endif
  45
  46 #include "buffer_io.h"
  47 #include "dentry.h"
  48 #include "lookup_table.h"
  49 #include "wimlib_internal.h"
  50 #include "xml.h"
  51
  52 static int
  53 image_print_metadata(WIMStruct *w)
  54 {
  55         DEBUG("Printing metadata for image %d", w->current_image);
  56         print_security_data(wim_security_data(w));
  57         return for_dentry_in_tree(wim_root_dentry(w), print_dentry,
  58                                   w->lookup_table);
  59 }
  60
  61
  62 static int
  63 image_print_files(WIMStruct *w)
  64 {
  65         return for_dentry_in_tree(wim_root_dentry(w), print_dentry_full_path,
  66                                   NULL);
  67 }
  68
  69 static WIMStruct *
  70 new_wim_struct()
  71 {
  72         WIMStruct *w = CALLOC(1, sizeof(WIMStruct));
  73 #ifdef WITH_FUSE
  74         if (pthread_mutex_init(&w->fp_tab_mutex, NULL) != 0) {
  75                 ERROR_WITH_ERRNO("Failed to initialize mutex");
  76                 FREE(w);
  77                 w = NULL;
  78         }
  79 #endif
  80         return w;
  81
  82 }
  83
  84 /*
  85  * Calls a function on images in the WIM.  If @image is WIMLIB_ALL_IMAGES, @visitor
  86  * is called on the WIM once for each image, with each image selected as the
  87  * current image in turn.  If @image is a certain image, @visitor is called on
  88  * the WIM only once, with that image selected.
  89  */
  90 int
  91 for_image(WIMStruct *w, int image, int (*visitor)(WIMStruct *))
  92 {
  93         int ret;
  94         int start;
  95         int end;
  96         int i;
  97
  98         if (image == WIMLIB_ALL_IMAGES) {
  99                 start = 1;
 100                 end = w->hdr.image_count;
 101         } else if (image >= 1 && image <= w->hdr.image_count) {
 102                 start = image;
 103                 end = image;
 104         } else {
 105                 return WIMLIB_ERR_INVALID_IMAGE;
 106         }
 107         for (i = start; i <= end; i++) {
 108                 ret = select_wim_image(w, i);
 109                 if (ret != 0)
 110                         return ret;
 111                 ret = visitor(w);
 112                 if (ret != 0)
 113                         return ret;
 114         }
 115         return 0;
 116 }
 117
 118 static int
 119 sort_image_metadata_by_position(const void *p1, const void *p2)
 120 {
 121         const struct wim_image_metadata *imd1 = p1;
 122         const struct wim_image_metadata *imd2 = p2;
 123         u64 offset1 = imd1->metadata_lte->resource_entry.offset;
 124         u64 offset2 = imd2->metadata_lte->resource_entry.offset;
 125         if (offset1 < offset2)
 126                 return -1;
 127         else if (offset1 > offset2)
 128                 return 1;
 129         else
 130                 return 0;
 131 }
 132
 133 /*
 134  * If @lte points to a metadata resource, append it to the list of metadata
 135  * resources in the WIMStruct.  Otherwise, do nothing.
 136  */
 137 static int
 138 append_metadata_resource_entry(struct wim_lookup_table_entry *lte, void *wim_p)
 139 {
 140         WIMStruct *w = wim_p;
 141         int ret = 0;
 142
 143         if (lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA) {
 144                 if (w->current_image == w->hdr.image_count) {
 145                         ERROR("The WIM header says there are %u images in the WIM,\n"
 146                               "        but we found more metadata resources than this",
 147                               w->hdr.image_count);
 148                         ret = WIMLIB_ERR_IMAGE_COUNT;
 149                 } else {
 150                         DEBUG("Found metadata resource for image %u at "
 151                               "offset %"PRIu64".",
 152                               w->current_image + 1,
 153                               lte->resource_entry.offset);
 154                         w->image_metadata[
 155                                 w->current_image++].metadata_lte = lte;
 156                 }
 157         }
 158         return ret;
 159 }
 160
 161 /* Returns the compression type given in the flags of a WIM header. */
 162 static int
 163 wim_hdr_flags_compression_type(int wim_hdr_flags)
 164 {
 165         if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESSION) {
 166                 if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_LZX)
 167                         return WIMLIB_COMPRESSION_TYPE_LZX;
 168                 else if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_XPRESS)
 169                         return WIMLIB_COMPRESSION_TYPE_XPRESS;
 170                 else
 171                         return WIMLIB_COMPRESSION_TYPE_INVALID;
 172         } else {
 173                 return WIMLIB_COMPRESSION_TYPE_NONE;
 174         }
 175 }
 176
 177 /*
 178  * Creates a WIMStruct for a new WIM file.
 179  */
 180 WIMLIBAPI int
 181 wimlib_create_new_wim(int ctype, WIMStruct **w_ret)
 182 {
 183         WIMStruct *w;
 184         struct wim_lookup_table *table;
 185         int ret;
 186
 187         DEBUG("Creating new WIM with %s compression.",
 188               wimlib_get_compression_type_string(ctype));
 189
 190         /* Allocate the WIMStruct. */
 191         w = new_wim_struct();
 192         if (!w)
 193                 return WIMLIB_ERR_NOMEM;
 194
 195         ret = init_header(&w->hdr, ctype);
 196         if (ret != 0)
 197                 goto out_free;
 198
 199         table = new_lookup_table(9001);
 200         if (!table) {
 201                 ret = WIMLIB_ERR_NOMEM;
 202                 goto out_free;
 203         }
 204         w->lookup_table = table;
 205         *w_ret = w;
 206         return 0;
 207 out_free:
 208         FREE(w);
 209         return ret;
 210 }
 211
 212 WIMLIBAPI int
 213 wimlib_get_num_images(const WIMStruct *w)
 214 {
 215         return w->hdr.image_count;
 216 }
 217
 218 int
 219 select_wim_image(WIMStruct *w, int image)
 220 {
 221         struct wim_image_metadata *imd;
 222         int ret;
 223
 224         DEBUG("Selecting image %d", image);
 225
 226         if (image == WIMLIB_NO_IMAGE) {
 227                 ERROR("Invalid image: %d", WIMLIB_NO_IMAGE);
 228                 return WIMLIB_ERR_INVALID_IMAGE;
 229         }
 230
 231         if (image == w->current_image)
 232                 return 0;
 233
 234         if (image < 1 || image > w->hdr.image_count) {
 235                 ERROR("Cannot select image %d: There are only %u images",
 236                       image, w->hdr.image_count);
 237                 return WIMLIB_ERR_INVALID_IMAGE;
 238         }
 239
 240         /* If a valid image is currently selected, it can be freed if it is not
 241          * modified.  */
 242         if (w->current_image != WIMLIB_NO_IMAGE) {
 243                 imd = wim_get_current_image_metadata(w);
 244                 if (!imd->modified) {
 245                         DEBUG("Freeing image %u", w->current_image);
 246                         destroy_image_metadata(imd, NULL);
 247                         imd->root_dentry = NULL;
 248                         imd->security_data = NULL;
 249                         INIT_HLIST_HEAD(&imd->inode_list);
 250                 }
 251         }
 252         w->current_image = image;
 253         imd = &w->image_metadata[image - 1];
 254         if (imd->root_dentry) {
 255                 ret = 0;
 256         } else {
 257                 #ifdef ENABLE_DEBUG
 258                 DEBUG("Reading metadata resource specified by the following "
 259                       "lookup table entry:");
 260                 print_lookup_table_entry(imd->metadata_lte, stdout);
 261                 #endif
 262                 ret = read_metadata_resource(w, imd);
 263                 if (ret)
 264                         w->current_image = WIMLIB_NO_IMAGE;
 265         }
 266         return ret;
 267 }
 268
 269
 270 /* Returns the compression type of the WIM file. */
 271 WIMLIBAPI int
 272 wimlib_get_compression_type(const WIMStruct *w)
 273 {
 274         return wim_hdr_flags_compression_type(w->hdr.flags);
 275 }
 276
 277 WIMLIBAPI const char *
 278 wimlib_get_compression_type_string(int ctype)
 279 {
 280         switch (ctype) {
 281                 case WIMLIB_COMPRESSION_TYPE_NONE:
 282                         return "None";
 283                 case WIMLIB_COMPRESSION_TYPE_LZX:
 284                         return "LZX";
 285                 case WIMLIB_COMPRESSION_TYPE_XPRESS:
 286                         return "XPRESS";
 287                 default:
 288                         return "Invalid";
 289         }
 290 }
 291
 292 /*
 293  * Returns the number of an image in the WIM file, given a string that is either
 294  * the number of the image, or the name of the image.  The images are numbered
 295  * starting at 1.
 296  */
 297 WIMLIBAPI int
 298 wimlib_resolve_image(WIMStruct *w, const utf8char *image_name_or_num)
 299 {
 300         char *p;
 301         int image;
 302         int i;
 303
 304         if (!image_name_or_num || !*image_name_or_num)
 305                 return WIMLIB_NO_IMAGE;
 306
 307         if (strcmp(image_name_or_num, "all") == 0
 308             || strcmp(image_name_or_num, "*") == 0)
 309                 return WIMLIB_ALL_IMAGES;
 310         image = strtol(image_name_or_num, &p, 10);
 311         if (p != image_name_or_num && *p == '\0' && image > 0) {
 312                 if (image > w->hdr.image_count)
 313                         return WIMLIB_NO_IMAGE;
 314                 return image;
 315         } else {
 316                 for (i = 1; i <= w->hdr.image_count; i++) {
 317                         if (strcmp(image_name_or_num,
 318                                    wimlib_get_image_name(w, i)) == 0)
 319                                 return i;
 320                 }
 321                 return WIMLIB_NO_IMAGE;
 322         }
 323 }
 324
 325
 326 /* Prints some basic information about a WIM file. */
 327 WIMLIBAPI void
 328 wimlib_print_wim_information(const WIMStruct *w)
 329 {
 330         const struct wim_header *hdr;
 331
 332         hdr = &w->hdr;
 333         puts("WIM Information:");
 334         puts("----------------");
 335         printf("Path:           %s\n", w->filename);
 336         fputs ("GUID:           0x", stdout);
 337         print_byte_field(hdr->guid, WIM_GID_LEN);
 338         putchar('\n');
 339         printf("Image Count:    %d\n", hdr->image_count);
 340         printf("Compression:    %s\n", wimlib_get_compression_type_string(
 341                                                 wimlib_get_compression_type(w)));
 342         printf("Part Number:    %d/%d\n", hdr->part_number, hdr->total_parts);
 343         printf("Boot Index:     %d\n", hdr->boot_idx);
 344         printf("Size:           %"PRIu64" bytes\n",
 345                                 wim_info_get_total_bytes(w->wim_info));
 346         printf("Integrity Info: %s\n", (w->hdr.integrity.offset != 0) ? "yes" : "no");
 347         putchar('\n');
 348 }
 349
 350 WIMLIBAPI bool
 351 wimlib_has_integrity_table(const WIMStruct *w)
 352 {
 353         return w->hdr.integrity.size != 0;
 354 }
 355
 356 WIMLIBAPI void
 357 wimlib_print_available_images(const WIMStruct *w, int image)
 358 {
 359         int first;
 360         int last;
 361         int i;
 362         int n;
 363         if (image == WIMLIB_ALL_IMAGES) {
 364                 n = printf("Available Images:\n");
 365                 first = 1;
 366                 last = w->hdr.image_count;
 367         } else if (image >= 1 && image <= w->hdr.image_count) {
 368                 n = printf("Information for Image %d\n", image);
 369                 first = image;
 370                 last = image;
 371         } else {
 372                 printf("wimlib_print_available_images(): Invalid image %d",
 373                        image);
 374                 return;
 375         }
 376         for (i = 0; i < n - 1; i++)
 377                 putchar('-');
 378         putchar('\n');
 379         for (i = first; i <= last; i++)
 380                 print_image_info(w->wim_info, i);
 381 }
 382
 383
 384 /* Prints the metadata for the specified image, which may be WIMLIB_ALL_IMAGES, but
 385  * not WIMLIB_NO_IMAGE. */
 386 WIMLIBAPI int
 387 wimlib_print_metadata(WIMStruct *w, int image)
 388 {
 389         if (w->hdr.part_number != 1) {
 390                 ERROR("Cannot show the metadata from part %hu of a %hu-part split WIM!",
 391                        w->hdr.part_number, w->hdr.total_parts);
 392                 ERROR("Select the first part of the split WIM to see the metadata.");
 393                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 394         }
 395         return for_image(w, image, image_print_metadata);
 396 }
 397
 398 WIMLIBAPI int
 399 wimlib_print_files(WIMStruct *w, int image)
 400 {
 401         if (w->hdr.part_number != 1) {
 402                 ERROR("Cannot list the files from part %hu of a %hu-part split WIM!",
 403                        w->hdr.part_number, w->hdr.total_parts);
 404                 ERROR("Select the first part of the split WIM if you'd like to list the files.");
 405                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 406         }
 407         return for_image(w, image, image_print_files);
 408 }
 409
 410 /* Sets the index of the bootable image. */
 411 WIMLIBAPI int
 412 wimlib_set_boot_idx(WIMStruct *w, int boot_idx)
 413 {
 414         if (w->hdr.total_parts != 1) {
 415                 ERROR("Cannot modify the boot index of a split WIM!");
 416                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 417         }
 418         if (boot_idx < 0 || boot_idx > w->hdr.image_count)
 419                 return WIMLIB_ERR_INVALID_IMAGE;
 420         w->hdr.boot_idx = boot_idx;
 421
 422         if (boot_idx == 0) {
 423                 memset(&w->hdr.boot_metadata_res_entry, 0,
 424                        sizeof(struct resource_entry));
 425         } else {
 426                 memcpy(&w->hdr.boot_metadata_res_entry,
 427                        &w->image_metadata[
 428                           boot_idx - 1].metadata_lte->resource_entry,
 429                        sizeof(struct resource_entry));
 430         }
 431
 432         return 0;
 433 }
 434
 435 WIMLIBAPI int
 436 wimlib_get_part_number(const WIMStruct *w, int *total_parts_ret)
 437 {
 438         if (total_parts_ret)
 439                 *total_parts_ret = w->hdr.total_parts;
 440         return w->hdr.part_number;
 441 }
 442
 443
 444 WIMLIBAPI int
 445 wimlib_get_boot_idx(const WIMStruct *w)
 446 {
 447         return w->hdr.boot_idx;
 448 }
 449
 450 /*
 451  * Begins the reading of a WIM file; opens the file and reads its header and
 452  * lookup table, and optionally checks the integrity.
 453  */
 454 static int
 455 begin_read(WIMStruct *w, const mbchar *in_wim_path, int open_flags,
 456            wimlib_progress_func_t progress_func)
 457 {
 458         int ret;
 459         int xml_num_images;
 460
 461         DEBUG("Reading the WIM file `%s'", in_wim_path);
 462
 463         w->fp = fopen(in_wim_path, "rb");
 464         if (!w->fp) {
 465                 ERROR_WITH_ERRNO("Failed to open `%s' for reading",
 466                                  in_wim_path);
 467                 return WIMLIB_ERR_OPEN;
 468         }
 469
 470         /* The absolute path to the WIM is requested so that wimlib_overwrite()
 471          * still works even if the process changes its working directory.  This
 472          * actually happens if a WIM is mounted read-write, since the FUSE
 473          * thread changes directory to "/", and it needs to be able to find the
 474          * WIM file again.
 475          *
 476          * This will break if the full path to the WIM changes in the
 477          * intervening time...
 478          *
 479          * Warning: in Windows native builds, realpath() calls the replacement
 480          * function in win32.c.
 481          */
 482         w->filename = realpath(in_wim_path, NULL);
 483         if (!w->filename) {
 484                 ERROR_WITH_ERRNO("Failed to resolve WIM filename");
 485                 if (errno == ENOMEM)
 486                         return WIMLIB_ERR_NOMEM;
 487                 else
 488                         return WIMLIB_ERR_OPEN;
 489         }
 490
 491         ret = read_header(w->fp, &w->hdr, open_flags);
 492         if (ret != 0)
 493                 return ret;
 494
 495         DEBUG("According to header, WIM contains %u images", w->hdr.image_count);
 496
 497         /* If the boot index is invalid, print a warning and set it to 0 */
 498         if (w->hdr.boot_idx > w->hdr.image_count) {
 499                 WARNING("In `%s', image %u is marked as bootable, "
 500                         "but there are only %u images in the WIM",
 501                         in_wim_path, w->hdr.boot_idx, w->hdr.image_count);
 502                 w->hdr.boot_idx = 0;
 503         }
 504
 505         if (wimlib_get_compression_type(w) == WIMLIB_COMPRESSION_TYPE_INVALID) {
 506                 ERROR("Invalid compression type (WIM header flags = 0x%x)",
 507                       w->hdr.flags);
 508                 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
 509         }
 510
 511         if (open_flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY) {
 512                 ret = check_wim_integrity(w, progress_func);
 513                 if (ret == WIM_INTEGRITY_NONEXISTENT) {
 514                         WARNING("No integrity information for `%s'; skipping "
 515                                 "integrity check.", in_wim_path);
 516                 } else if (ret == WIM_INTEGRITY_NOT_OK) {
 517                         ERROR("WIM is not intact! (Failed integrity check)");
 518                         return WIMLIB_ERR_INTEGRITY;
 519                 } else if (ret != WIM_INTEGRITY_OK) {
 520                         return ret;
 521                 }
 522         }
 523
 524         ret = read_lookup_table(w);
 525         if (ret != 0)
 526                 return ret;
 527
 528         if (w->hdr.image_count != 0) {
 529                 w->image_metadata = CALLOC(w->hdr.image_count,
 530                                            sizeof(struct wim_image_metadata));
 531
 532                 if (!w->image_metadata) {
 533                         ERROR("Failed to allocate memory for %u image metadata structures",
 534                               w->hdr.image_count);
 535                         return WIMLIB_ERR_NOMEM;
 536                 }
 537         }
 538         w->current_image = 0;
 539
 540         DEBUG("Looking for metadata resources in the lookup table.");
 541
 542         /* Find the images in the WIM by searching the lookup table. */
 543         ret = for_lookup_table_entry(w->lookup_table,
 544                                      append_metadata_resource_entry, w);
 545
 546         if (ret != 0)
 547                 return ret;
 548
 549         /* Make sure all the expected images were found.  (We already have
 550          * returned WIMLIB_ERR_IMAGE_COUNT if *extra* images were found) */
 551         if (w->current_image != w->hdr.image_count &&
 552             w->hdr.part_number == 1)
 553         {
 554                 ERROR("Only found %d images in WIM, but expected %u",
 555                       w->current_image, w->hdr.image_count);
 556                 return WIMLIB_ERR_IMAGE_COUNT;
 557         }
 558
 559         /* Sort images by the position of their metadata resources.  I'm
 560          * assuming that is what determines the other of the images in the WIM
 561          * file, rather than their order in the lookup table, which is random
 562          * because of hashing. */
 563         qsort(w->image_metadata, w->current_image,
 564               sizeof(struct wim_image_metadata), sort_image_metadata_by_position);
 565
 566         w->current_image = WIMLIB_NO_IMAGE;
 567
 568         /* Read the XML data. */
 569         ret = read_xml_data(w->fp, &w->hdr.xml_res_entry,
 570                             &w->xml_data, &w->wim_info);
 571
 572         if (ret != 0)
 573                 return ret;
 574
 575         xml_num_images = wim_info_get_num_images(w->wim_info);
 576         if (xml_num_images != w->hdr.image_count) {
 577                 ERROR("In the file `%s', there are %u <IMAGE> elements "
 578                       "in the XML data,", in_wim_path, xml_num_images);
 579                 ERROR("but %u images in the WIM!  There must be exactly one "
 580                       "<IMAGE> element per image.", w->hdr.image_count);
 581                 return WIMLIB_ERR_IMAGE_COUNT;
 582         }
 583
 584         DEBUG("Done beginning read of WIM file `%s'.", in_wim_path);
 585         return 0;
 586 }
 587
 588 /*
 589  * Opens a WIM file and creates a WIMStruct for it.
 590  */
 591 WIMLIBAPI int
 592 wimlib_open_wim(const mbchar *wim_file, int open_flags,
 593                 WIMStruct **w_ret,
 594                 wimlib_progress_func_t progress_func)
 595 {
 596         WIMStruct *w;
 597         int ret;
 598
 599         if (!wim_file || !w_ret)
 600                 return WIMLIB_ERR_INVALID_PARAM;
 601
 602         w = new_wim_struct();
 603         if (!w)
 604                 return WIMLIB_ERR_NOMEM;
 605
 606         ret = begin_read(w, wim_file, open_flags, progress_func);
 607         if (ret == 0)
 608                 *w_ret = w;
 609         else
 610                 wimlib_free(w);
 611         return ret;
 612 }
 613
 614 void
 615 destroy_image_metadata(struct wim_image_metadata *imd,
 616                        struct wim_lookup_table *table)
 617 {
 618         free_dentry_tree(imd->root_dentry, table);
 619         free_security_data(imd->security_data);
 620
 621         /* Get rid of the lookup table entry for this image's metadata resource
 622          * */
 623         if (table) {
 624                 lookup_table_unlink(table, imd->metadata_lte);
 625                 free_lookup_table_entry(imd->metadata_lte);
 626         }
 627 }
 628
 629 /* Frees the memory for the WIMStruct, including all internal memory; also
 630  * closes all files associated with the WIMStruct.  */
 631 WIMLIBAPI void
 632 wimlib_free(WIMStruct *w)
 633 {
 634         DEBUG("Freeing WIMStruct");
 635
 636         if (!w)
 637                 return;
 638         if (w->fp)
 639                 fclose(w->fp);
 640         if (w->out_fp)
 641                 fclose(w->out_fp);
 642
 643 #ifdef WITH_FUSE
 644         if (w->fp_tab) {
 645                 for (size_t i = 0; i < w->num_allocated_fps; i++)
 646                         if (w->fp_tab[i])
 647                                 fclose(w->fp_tab[i]);
 648                 FREE(w->fp_tab);
 649         }
 650         pthread_mutex_destroy(&w->fp_tab_mutex);
 651 #endif
 652
 653         free_lookup_table(w->lookup_table);
 654
 655         FREE(w->filename);
 656         FREE(w->xml_data);
 657         free_wim_info(w->wim_info);
 658         if (w->image_metadata) {
 659                 for (unsigned i = 0; i < w->hdr.image_count; i++)
 660                         destroy_image_metadata(&w->image_metadata[i], NULL);
 661                 FREE(w->image_metadata);
 662         }
 663 #ifdef WITH_NTFS_3G
 664         if (w->ntfs_vol) {
 665                 DEBUG("Unmounting NTFS volume");
 666                 ntfs_umount(w->ntfs_vol, FALSE);
 667         }
 668 #endif
 669         FREE(w);
 670         DEBUG("Freed WIMStruct");
 671 }
 672
 673 static bool
 674 test_locale_ctype_utf8()
 675 {
 676         char *ctype = nl_langinfo(CODESET);
 677
 678         return (strstr(ctype, "UTF-8") == 0 ||
 679                 strstr(ctype, "UTF8") == 0 ||
 680                 strstr(ctype, "utf8") == 0 ||
 681                 strstr(ctype, "utf-8") == 0);
 682 }
 683
 684 /* Get global memory allocations out of the way.  Not strictly necessary in
 685  * single-threaded programs like 'imagex'. */
 686 WIMLIBAPI int
 687 wimlib_global_init()
 688 {
 689         libxml_global_init();
 690 #ifdef WITH_NTFS_3G
 691         libntfs3g_global_init();
 692 #endif
 693         wimlib_mbs_is_utf8 = test_locale_ctype_utf8();
 694         return 0;
 695 }
 696
 697 /* Free global memory allocations.  Not strictly necessary if the process using
 698  * wimlib is just about to exit (as is the case for 'imagex'). */
 699 WIMLIBAPI void
 700 wimlib_global_cleanup()
 701 {
 702         libxml_global_cleanup();
 703         iconv_global_cleanup();
 704 }