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