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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 #ifdef __WIN32__
  29 #       include <windows.h>
  30 #       ifdef ERROR
  31 #               undef ERROR
  32 #       endif
  33 #endif
  34
  35 #include <limits.h>
  36 #include <stdlib.h>
  37 #include <stdarg.h>
  38 #include <errno.h>
  39
  40 #include "dentry.h"
  41 #include <unistd.h>
  42 #include <fcntl.h>
  43
  44 #ifdef WITH_NTFS_3G
  45 #include <time.h>
  46 #include <ntfs-3g/volume.h>
  47 #endif
  48
  49 #include "wimlib_internal.h"
  50 #include "buffer_io.h"
  51 #include "lookup_table.h"
  52 #include "xml.h"
  53
  54 #ifdef __WIN32__
  55 static char *realpath(const char *path, char *resolved_path)
  56 {
  57         DWORD ret;
  58         wimlib_assert(resolved_path == NULL);
  59
  60         ret = GetFullPathNameA(path, 0, NULL, NULL);
  61         if (!ret)
  62                 goto fail_win32;
  63
  64         resolved_path = MALLOC(ret + 1);
  65         if (!resolved_path)
  66                 goto fail;
  67         ret = GetFullPathNameA(path, ret, resolved_path, NULL);
  68         if (!ret) {
  69                 free(resolved_path);
  70                 goto fail_win32;
  71         }
  72         return resolved_path;
  73 fail_win32:
  74         win32_error(GetLastError());
  75 fail:
  76         return NULL;
  77 }
  78 #endif
  79
  80 static int image_print_metadata(WIMStruct *w)
  81 {
  82         DEBUG("Printing metadata for image %d", w->current_image);
  83         print_security_data(wim_security_data(w));
  84         return for_dentry_in_tree(wim_root_dentry(w), print_dentry,
  85                                   w->lookup_table);
  86 }
  87
  88
  89 static int image_print_files(WIMStruct *w)
  90 {
  91         return for_dentry_in_tree(wim_root_dentry(w), print_dentry_full_path,
  92                                   NULL);
  93 }
  94
  95 static WIMStruct *new_wim_struct()
  96 {
  97         WIMStruct *w = CALLOC(1, sizeof(WIMStruct));
  98 #ifdef WITH_FUSE
  99         if (pthread_mutex_init(&w->fp_tab_mutex, NULL) != 0) {
 100                 ERROR_WITH_ERRNO("Failed to initialize mutex");
 101                 FREE(w);
 102                 w = NULL;
 103         }
 104 #endif
 105         return w;
 106
 107 }
 108
 109 /*
 110  * Calls a function on images in the WIM.  If @image is WIMLIB_ALL_IMAGES, @visitor
 111  * is called on the WIM once for each image, with each image selected as the
 112  * current image in turn.  If @image is a certain image, @visitor is called on
 113  * the WIM only once, with that image selected.
 114  */
 115 int for_image(WIMStruct *w, int image, int (*visitor)(WIMStruct *))
 116 {
 117         int ret;
 118         int start;
 119         int end;
 120         int i;
 121
 122         if (image == WIMLIB_ALL_IMAGES) {
 123                 start = 1;
 124                 end = w->hdr.image_count;
 125         } else if (image >= 1 && image <= w->hdr.image_count) {
 126                 start = image;
 127                 end = image;
 128         } else {
 129                 return WIMLIB_ERR_INVALID_IMAGE;
 130         }
 131         for (i = start; i <= end; i++) {
 132                 ret = select_wim_image(w, i);
 133                 if (ret != 0)
 134                         return ret;
 135                 ret = visitor(w);
 136                 if (ret != 0)
 137                         return ret;
 138         }
 139         return 0;
 140 }
 141
 142 static int sort_image_metadata_by_position(const void *p1, const void *p2)
 143 {
 144         const struct wim_image_metadata *imd1 = p1;
 145         const struct wim_image_metadata *imd2 = p2;
 146         u64 offset1 = imd1->metadata_lte->resource_entry.offset;
 147         u64 offset2 = imd2->metadata_lte->resource_entry.offset;
 148         if (offset1 < offset2)
 149                 return -1;
 150         else if (offset1 > offset2)
 151                 return 1;
 152         else
 153                 return 0;
 154 }
 155
 156 /*
 157  * If @lte points to a metadata resource, append it to the list of metadata
 158  * resources in the WIMStruct.  Otherwise, do nothing.
 159  */
 160 static int append_metadata_resource_entry(struct wim_lookup_table_entry *lte,
 161                                           void *wim_p)
 162 {
 163         WIMStruct *w = wim_p;
 164         int ret = 0;
 165
 166         if (lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA) {
 167                 if (w->current_image == w->hdr.image_count) {
 168                         ERROR("The WIM header says there are %u images in the WIM,\n"
 169                               "        but we found more metadata resources than this",
 170                               w->hdr.image_count);
 171                         ret = WIMLIB_ERR_IMAGE_COUNT;
 172                 } else {
 173                         DEBUG("Found metadata resource for image %u at "
 174                               "offset %"PRIu64".",
 175                               w->current_image + 1,
 176                               lte->resource_entry.offset);
 177                         w->image_metadata[
 178                                 w->current_image++].metadata_lte = lte;
 179                 }
 180         }
 181         return ret;
 182 }
 183
 184 /* Returns the compression type given in the flags of a WIM header. */
 185 static int wim_hdr_flags_compression_type(int wim_hdr_flags)
 186 {
 187         if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESSION) {
 188                 if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_LZX)
 189                         return WIMLIB_COMPRESSION_TYPE_LZX;
 190                 else if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_XPRESS)
 191                         return WIMLIB_COMPRESSION_TYPE_XPRESS;
 192                 else
 193                         return WIMLIB_COMPRESSION_TYPE_INVALID;
 194         } else {
 195                 return WIMLIB_COMPRESSION_TYPE_NONE;
 196         }
 197 }
 198
 199 /*
 200  * Creates a WIMStruct for a new WIM file.
 201  */
 202 WIMLIBAPI int wimlib_create_new_wim(int ctype, WIMStruct **w_ret)
 203 {
 204         WIMStruct *w;
 205         struct wim_lookup_table *table;
 206         int ret;
 207
 208         DEBUG("Creating new WIM with %s compression.",
 209               wimlib_get_compression_type_string(ctype));
 210
 211         /* Allocate the WIMStruct. */
 212         w = new_wim_struct();
 213         if (!w)
 214                 return WIMLIB_ERR_NOMEM;
 215
 216         ret = init_header(&w->hdr, ctype);
 217         if (ret != 0)
 218                 goto out_free;
 219
 220         table = new_lookup_table(9001);
 221         if (!table) {
 222                 ret = WIMLIB_ERR_NOMEM;
 223                 goto out_free;
 224         }
 225         w->lookup_table = table;
 226         *w_ret = w;
 227         return 0;
 228 out_free:
 229         FREE(w);
 230         return ret;
 231 }
 232
 233 WIMLIBAPI int wimlib_get_num_images(const WIMStruct *w)
 234 {
 235         return w->hdr.image_count;
 236 }
 237
 238 int select_wim_image(WIMStruct *w, int image)
 239 {
 240         struct wim_image_metadata *imd;
 241         int ret;
 242
 243         DEBUG("Selecting image %d", image);
 244
 245         if (image == WIMLIB_NO_IMAGE) {
 246                 ERROR("Invalid image: %d", WIMLIB_NO_IMAGE);
 247                 return WIMLIB_ERR_INVALID_IMAGE;
 248         }
 249
 250         if (image == w->current_image)
 251                 return 0;
 252
 253         if (image < 1 || image > w->hdr.image_count) {
 254                 ERROR("Cannot select image %d: There are only %u images",
 255                       image, w->hdr.image_count);
 256                 return WIMLIB_ERR_INVALID_IMAGE;
 257         }
 258
 259         /* If a valid image is currently selected, it can be freed if it is not
 260          * modified.  */
 261         if (w->current_image != WIMLIB_NO_IMAGE) {
 262                 imd = wim_get_current_image_metadata(w);
 263                 if (!imd->modified) {
 264                         DEBUG("Freeing image %u", w->current_image);
 265                         destroy_image_metadata(imd, NULL);
 266                         imd->root_dentry = NULL;
 267                         imd->security_data = NULL;
 268                         INIT_HLIST_HEAD(&imd->inode_list);
 269                 }
 270         }
 271         w->current_image = image;
 272         imd = &w->image_metadata[image - 1];
 273         if (imd->root_dentry) {
 274                 ret = 0;
 275         } else {
 276                 #ifdef ENABLE_DEBUG
 277                 DEBUG("Reading metadata resource specified by the following "
 278                       "lookup table entry:");
 279                 print_lookup_table_entry(imd->metadata_lte, stdout);
 280                 #endif
 281                 ret = read_metadata_resource(w, imd);
 282                 if (ret)
 283                         w->current_image = WIMLIB_NO_IMAGE;
 284         }
 285         return ret;
 286 }
 287
 288
 289 /* Returns the compression type of the WIM file. */
 290 WIMLIBAPI int wimlib_get_compression_type(const WIMStruct *w)
 291 {
 292         return wim_hdr_flags_compression_type(w->hdr.flags);
 293 }
 294
 295 WIMLIBAPI const char *wimlib_get_compression_type_string(int ctype)
 296 {
 297         switch (ctype) {
 298                 case WIMLIB_COMPRESSION_TYPE_NONE:
 299                         return "None";
 300                 case WIMLIB_COMPRESSION_TYPE_LZX:
 301                         return "LZX";
 302                 case WIMLIB_COMPRESSION_TYPE_XPRESS:
 303                         return "XPRESS";
 304                 default:
 305                         return "Invalid";
 306         }
 307 }
 308
 309 /*
 310  * Returns the number of an image in the WIM file, given a string that is either
 311  * the number of the image, or the name of the image.  The images are numbered
 312  * starting at 1.
 313  */
 314 WIMLIBAPI int wimlib_resolve_image(WIMStruct *w, const char *image_name_or_num)
 315 {
 316         char *p;
 317         int image;
 318         int i;
 319
 320         if (!image_name_or_num || !*image_name_or_num)
 321                 return WIMLIB_NO_IMAGE;
 322
 323         if (strcmp(image_name_or_num, "all") == 0
 324             || strcmp(image_name_or_num, "*") == 0)
 325                 return WIMLIB_ALL_IMAGES;
 326         image = strtol(image_name_or_num, &p, 10);
 327         if (p != image_name_or_num && *p == '\0' && image > 0) {
 328                 if (image > w->hdr.image_count)
 329                         return WIMLIB_NO_IMAGE;
 330                 return image;
 331         } else {
 332                 for (i = 1; i <= w->hdr.image_count; i++) {
 333                         if (strcmp(image_name_or_num,
 334                                    wimlib_get_image_name(w, i)) == 0)
 335                                 return i;
 336                 }
 337                 return WIMLIB_NO_IMAGE;
 338         }
 339 }
 340
 341
 342 /* Prints some basic information about a WIM file. */
 343 WIMLIBAPI void wimlib_print_wim_information(const WIMStruct *w)
 344 {
 345         const struct wim_header *hdr;
 346
 347         hdr = &w->hdr;
 348         puts("WIM Information:");
 349         puts("----------------");
 350         printf("Path:           %s\n", w->filename);
 351         fputs ("GUID:           0x", stdout);
 352         print_byte_field(hdr->guid, WIM_GID_LEN);
 353         putchar('\n');
 354         printf("Image Count:    %d\n", hdr->image_count);
 355         printf("Compression:    %s\n", wimlib_get_compression_type_string(
 356                                                 wimlib_get_compression_type(w)));
 357         printf("Part Number:    %d/%d\n", hdr->part_number, hdr->total_parts);
 358         printf("Boot Index:     %d\n", hdr->boot_idx);
 359         printf("Size:           %"PRIu64" bytes\n",
 360                                 wim_info_get_total_bytes(w->wim_info));
 361         printf("Integrity Info: %s\n", (w->hdr.integrity.offset != 0) ? "yes" : "no");
 362         putchar('\n');
 363 }
 364
 365 WIMLIBAPI bool wimlib_has_integrity_table(const WIMStruct *w)
 366 {
 367         return w->hdr.integrity.size != 0;
 368 }
 369
 370 WIMLIBAPI void wimlib_print_available_images(const WIMStruct *w, int image)
 371 {
 372         int first;
 373         int last;
 374         int i;
 375         int n;
 376         if (image == WIMLIB_ALL_IMAGES) {
 377                 n = printf("Available Images:\n");
 378                 first = 1;
 379                 last = w->hdr.image_count;
 380         } else if (image >= 1 && image <= w->hdr.image_count) {
 381                 n = printf("Information for Image %d\n", image);
 382                 first = image;
 383                 last = image;
 384         } else {
 385                 printf("wimlib_print_available_images(): Invalid image %d",
 386                        image);
 387                 return;
 388         }
 389         for (i = 0; i < n - 1; i++)
 390                 putchar('-');
 391         putchar('\n');
 392         for (i = first; i <= last; i++)
 393                 print_image_info(w->wim_info, i);
 394 }
 395
 396
 397 /* Prints the metadata for the specified image, which may be WIMLIB_ALL_IMAGES, but
 398  * not WIMLIB_NO_IMAGE. */
 399 WIMLIBAPI int wimlib_print_metadata(WIMStruct *w, int image)
 400 {
 401         if (w->hdr.part_number != 1) {
 402                 ERROR("Cannot show the metadata 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 to see the metadata.");
 405                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 406         }
 407         return for_image(w, image, image_print_metadata);
 408 }
 409
 410 WIMLIBAPI int wimlib_print_files(WIMStruct *w, int image)
 411 {
 412         if (w->hdr.part_number != 1) {
 413                 ERROR("Cannot list the files from part %hu of a %hu-part split WIM!",
 414                        w->hdr.part_number, w->hdr.total_parts);
 415                 ERROR("Select the first part of the split WIM if you'd like to list the files.");
 416                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 417         }
 418         return for_image(w, image, image_print_files);
 419 }
 420
 421 /* Sets the index of the bootable image. */
 422 WIMLIBAPI int wimlib_set_boot_idx(WIMStruct *w, int boot_idx)
 423 {
 424         if (w->hdr.total_parts != 1) {
 425                 ERROR("Cannot modify the boot index of a split WIM!");
 426                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 427         }
 428         if (boot_idx < 0 || boot_idx > w->hdr.image_count)
 429                 return WIMLIB_ERR_INVALID_IMAGE;
 430         w->hdr.boot_idx = boot_idx;
 431
 432         if (boot_idx == 0) {
 433                 memset(&w->hdr.boot_metadata_res_entry, 0,
 434                        sizeof(struct resource_entry));
 435         } else {
 436                 memcpy(&w->hdr.boot_metadata_res_entry,
 437                        &w->image_metadata[
 438                           boot_idx - 1].metadata_lte->resource_entry,
 439                        sizeof(struct resource_entry));
 440         }
 441
 442         return 0;
 443 }
 444
 445 WIMLIBAPI int wimlib_get_part_number(const WIMStruct *w, int *total_parts_ret)
 446 {
 447         if (total_parts_ret)
 448                 *total_parts_ret = w->hdr.total_parts;
 449         return w->hdr.part_number;
 450 }
 451
 452
 453 WIMLIBAPI int wimlib_get_boot_idx(const WIMStruct *w)
 454 {
 455         return w->hdr.boot_idx;
 456 }
 457
 458 /*
 459  * Begins the reading of a WIM file; opens the file and reads its header and
 460  * lookup table, and optionally checks the integrity.
 461  */
 462 static int begin_read(WIMStruct *w, const char *in_wim_path, int open_flags,
 463                       wimlib_progress_func_t progress_func)
 464 {
 465         int ret;
 466         int xml_num_images;
 467
 468         DEBUG("Reading the WIM file `%s'", in_wim_path);
 469
 470         w->fp = fopen(in_wim_path, "rb");
 471         if (!w->fp) {
 472                 ERROR_WITH_ERRNO("Failed to open `%s' for reading",
 473                                  in_wim_path);
 474                 return WIMLIB_ERR_OPEN;
 475         }
 476
 477         /* The absolute path to the WIM is requested so that wimlib_overwrite()
 478          * still works even if the process changes its working directory.  This
 479          * actually happens if a WIM is mounted read-write, since the FUSE
 480          * thread changes directory to "/", and it needs to be able to find the
 481          * WIM file again.
 482          *
 483          * This will break if the full path to the WIM changes in the
 484          * intervening time...
 485          */
 486         w->filename = realpath(in_wim_path, NULL);
 487         if (!w->filename) {
 488                 ERROR_WITH_ERRNO("Failed to resolve WIM filename");
 489                 if (errno == ENOMEM)
 490                         return WIMLIB_ERR_NOMEM;
 491                 else
 492                         return WIMLIB_ERR_OPEN;
 493         }
 494
 495         ret = read_header(w->fp, &w->hdr, open_flags);
 496         if (ret != 0)
 497                 return ret;
 498
 499         DEBUG("According to header, WIM contains %u images", w->hdr.image_count);
 500
 501         /* If the boot index is invalid, print a warning and set it to 0 */
 502         if (w->hdr.boot_idx > w->hdr.image_count) {
 503                 WARNING("In `%s', image %u is marked as bootable, "
 504                         "but there are only %u images in the WIM",
 505                         in_wim_path, w->hdr.boot_idx, w->hdr.image_count);
 506                 w->hdr.boot_idx = 0;
 507         }
 508
 509         if (wimlib_get_compression_type(w) == WIMLIB_COMPRESSION_TYPE_INVALID) {
 510                 ERROR("Invalid compression type (WIM header flags = 0x%x)",
 511                       w->hdr.flags);
 512                 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
 513         }
 514
 515         if (open_flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY) {
 516                 ret = check_wim_integrity(w, progress_func);
 517                 if (ret == WIM_INTEGRITY_NONEXISTENT) {
 518                         WARNING("No integrity information for `%s'; skipping "
 519                                 "integrity check.", in_wim_path);
 520                 } else if (ret == WIM_INTEGRITY_NOT_OK) {
 521                         ERROR("WIM is not intact! (Failed integrity check)");
 522                         return WIMLIB_ERR_INTEGRITY;
 523                 } else if (ret != WIM_INTEGRITY_OK) {
 524                         return ret;
 525                 }
 526         }
 527
 528         ret = read_lookup_table(w);
 529         if (ret != 0)
 530                 return ret;
 531
 532         if (w->hdr.image_count != 0) {
 533                 w->image_metadata = CALLOC(w->hdr.image_count,
 534                                            sizeof(struct wim_image_metadata));
 535
 536                 if (!w->image_metadata) {
 537                         ERROR("Failed to allocate memory for %u image metadata structures",
 538                               w->hdr.image_count);
 539                         return WIMLIB_ERR_NOMEM;
 540                 }
 541         }
 542         w->current_image = 0;
 543
 544         DEBUG("Looking for metadata resources in the lookup table.");
 545
 546         /* Find the images in the WIM by searching the lookup table. */
 547         ret = for_lookup_table_entry(w->lookup_table,
 548                                      append_metadata_resource_entry, w);
 549
 550         if (ret != 0)
 551                 return ret;
 552
 553         /* Make sure all the expected images were found.  (We already have
 554          * returned WIMLIB_ERR_IMAGE_COUNT if *extra* images were found) */
 555         if (w->current_image != w->hdr.image_count &&
 556             w->hdr.part_number == 1)
 557         {
 558                 ERROR("Only found %d images in WIM, but expected %u",
 559                       w->current_image, w->hdr.image_count);
 560                 return WIMLIB_ERR_IMAGE_COUNT;
 561         }
 562
 563         /* Sort images by the position of their metadata resources.  I'm
 564          * assuming that is what determines the other of the images in the WIM
 565          * file, rather than their order in the lookup table, which is random
 566          * because of hashing. */
 567         qsort(w->image_metadata, w->current_image,
 568               sizeof(struct wim_image_metadata), sort_image_metadata_by_position);
 569
 570         w->current_image = WIMLIB_NO_IMAGE;
 571
 572         /* Read the XML data. */
 573         ret = read_xml_data(w->fp, &w->hdr.xml_res_entry,
 574                             &w->xml_data, &w->wim_info);
 575
 576         if (ret != 0)
 577                 return ret;
 578
 579         xml_num_images = wim_info_get_num_images(w->wim_info);
 580         if (xml_num_images != w->hdr.image_count) {
 581                 ERROR("In the file `%s', there are %u <IMAGE> elements "
 582                       "in the XML data,", in_wim_path, xml_num_images);
 583                 ERROR("but %u images in the WIM!  There must be exactly one "
 584                       "<IMAGE> element per image.", w->hdr.image_count);
 585                 return WIMLIB_ERR_IMAGE_COUNT;
 586         }
 587
 588         DEBUG("Done beginning read of WIM file `%s'.", in_wim_path);
 589         return 0;
 590 }
 591
 592
 593 /*
 594  * Opens a WIM file and creates a WIMStruct for it.
 595  */
 596 WIMLIBAPI int wimlib_open_wim(const char *wim_file, int open_flags,
 597                               WIMStruct **w_ret,
 598                               wimlib_progress_func_t progress_func)
 599 {
 600         WIMStruct *w;
 601         int ret;
 602
 603         if (!wim_file || !w_ret)
 604                 return WIMLIB_ERR_INVALID_PARAM;
 605
 606         w = new_wim_struct();
 607         if (!w)
 608                 return WIMLIB_ERR_NOMEM;
 609
 610         ret = begin_read(w, wim_file, open_flags, progress_func);
 611         if (ret == 0)
 612                 *w_ret = w;
 613         else
 614                 wimlib_free(w);
 615         return ret;
 616 }
 617
 618 void destroy_image_metadata(struct wim_image_metadata *imd,
 619                             struct wim_lookup_table *table)
 620 {
 621         free_dentry_tree(imd->root_dentry, table);
 622         free_security_data(imd->security_data);
 623
 624         /* Get rid of the lookup table entry for this image's metadata resource
 625          * */
 626         if (table) {
 627                 lookup_table_unlink(table, imd->metadata_lte);
 628                 free_lookup_table_entry(imd->metadata_lte);
 629         }
 630 }
 631
 632 /* Frees the memory for the WIMStruct, including all internal memory; also
 633  * closes all files associated with the WIMStruct.  */
 634 WIMLIBAPI void wimlib_free(WIMStruct *w)
 635 {
 636         DEBUG("Freeing WIMStruct");
 637
 638         if (!w)
 639                 return;
 640         if (w->fp)
 641                 fclose(w->fp);
 642         if (w->out_fp)
 643                 fclose(w->out_fp);
 644
 645 #ifdef WITH_FUSE
 646         if (w->fp_tab) {
 647                 for (size_t i = 0; i < w->num_allocated_fps; i++)
 648                         if (w->fp_tab[i])
 649                                 fclose(w->fp_tab[i]);
 650                 FREE(w->fp_tab);
 651         }
 652         pthread_mutex_destroy(&w->fp_tab_mutex);
 653 #endif
 654
 655         free_lookup_table(w->lookup_table);
 656
 657         FREE(w->filename);
 658         FREE(w->xml_data);
 659         free_wim_info(w->wim_info);
 660         if (w->image_metadata) {
 661                 for (unsigned i = 0; i < w->hdr.image_count; i++)
 662                         destroy_image_metadata(&w->image_metadata[i], NULL);
 663                 FREE(w->image_metadata);
 664         }
 665 #ifdef WITH_NTFS_3G
 666         if (w->ntfs_vol) {
 667                 DEBUG("Unmounting NTFS volume");
 668                 ntfs_umount(w->ntfs_vol, FALSE);
 669         }
 670 #endif
 671         FREE(w);
 672         DEBUG("Freed WIMStruct");
 673 }
 674
 675 /* Get global memory allocations out of the way.  Not strictly necessary in
 676  * single-threaded programs like 'imagex'. */
 677 WIMLIBAPI int wimlib_global_init()
 678 {
 679         libxml_global_init();
 680         return iconv_global_init();
 681 }
 682
 683 /* Free global memory allocations.  Not strictly necessary if the process using
 684  * wimlib is just about to exit (as is the case for 'imagex'). */
 685 WIMLIBAPI void wimlib_global_cleanup()
 686 {
 687         libxml_global_cleanup();
 688         iconv_global_cleanup();
 689 }