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