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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 /* Returns the compression type given in the flags of a WIM header. */
 119 static int
 120 wim_hdr_flags_compression_type(int wim_hdr_flags)
 121 {
 122         if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESSION) {
 123                 if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_LZX)
 124                         return WIMLIB_COMPRESSION_TYPE_LZX;
 125                 else if (wim_hdr_flags & WIM_HDR_FLAG_COMPRESS_XPRESS)
 126                         return WIMLIB_COMPRESSION_TYPE_XPRESS;
 127                 else
 128                         return WIMLIB_COMPRESSION_TYPE_INVALID;
 129         } else {
 130                 return WIMLIB_COMPRESSION_TYPE_NONE;
 131         }
 132 }
 133
 134 /*
 135  * Creates a WIMStruct for a new WIM file.
 136  */
 137 WIMLIBAPI int
 138 wimlib_create_new_wim(int ctype, WIMStruct **w_ret)
 139 {
 140         WIMStruct *w;
 141         struct wim_lookup_table *table;
 142         int ret;
 143
 144         DEBUG("Creating new WIM with %"TS" compression.",
 145               wimlib_get_compression_type_string(ctype));
 146
 147         /* Allocate the WIMStruct. */
 148         w = new_wim_struct();
 149         if (!w)
 150                 return WIMLIB_ERR_NOMEM;
 151
 152         ret = init_header(&w->hdr, ctype);
 153         if (ret != 0)
 154                 goto out_free;
 155
 156         table = new_lookup_table(9001);
 157         if (!table) {
 158                 ret = WIMLIB_ERR_NOMEM;
 159                 goto out_free;
 160         }
 161         w->lookup_table = table;
 162         *w_ret = w;
 163         return 0;
 164 out_free:
 165         FREE(w);
 166         return ret;
 167 }
 168
 169 WIMLIBAPI int
 170 wimlib_get_num_images(const WIMStruct *w)
 171 {
 172         return w->hdr.image_count;
 173 }
 174
 175 int
 176 select_wim_image(WIMStruct *w, int image)
 177 {
 178         struct wim_image_metadata *imd;
 179         int ret;
 180
 181         DEBUG("Selecting image %d", image);
 182
 183         if (image == WIMLIB_NO_IMAGE) {
 184                 ERROR("Invalid image: %d", WIMLIB_NO_IMAGE);
 185                 return WIMLIB_ERR_INVALID_IMAGE;
 186         }
 187
 188         if (image == w->current_image)
 189                 return 0;
 190
 191         if (image < 1 || image > w->hdr.image_count) {
 192                 ERROR("Cannot select image %d: There are only %u images",
 193                       image, w->hdr.image_count);
 194                 return WIMLIB_ERR_INVALID_IMAGE;
 195         }
 196
 197         /* If a valid image is currently selected, it can be freed if it is not
 198          * modified.  */
 199         if (w->current_image != WIMLIB_NO_IMAGE) {
 200                 imd = wim_get_current_image_metadata(w);
 201                 if (!imd->modified) {
 202                         wimlib_assert(list_empty(&imd->unhashed_streams));
 203                         DEBUG("Freeing image %u", w->current_image);
 204                         destroy_image_metadata(imd, NULL, false);
 205                 }
 206         }
 207         w->current_image = image;
 208         imd = wim_get_current_image_metadata(w);
 209         if (imd->root_dentry) {
 210                 ret = 0;
 211         } else {
 212                 #ifdef ENABLE_DEBUG
 213                 DEBUG("Reading metadata resource specified by the following "
 214                       "lookup table entry:");
 215                 print_lookup_table_entry(imd->metadata_lte, stderr);
 216                 #endif
 217                 ret = read_metadata_resource(w, imd);
 218                 if (ret)
 219                         w->current_image = WIMLIB_NO_IMAGE;
 220         }
 221         return ret;
 222 }
 223
 224
 225 /* Returns the compression type of the WIM file. */
 226 WIMLIBAPI int
 227 wimlib_get_compression_type(const WIMStruct *w)
 228 {
 229         return wim_hdr_flags_compression_type(w->hdr.flags);
 230 }
 231
 232 WIMLIBAPI const tchar *
 233 wimlib_get_compression_type_string(int ctype)
 234 {
 235         switch (ctype) {
 236                 case WIMLIB_COMPRESSION_TYPE_NONE:
 237                         return T("None");
 238                 case WIMLIB_COMPRESSION_TYPE_LZX:
 239                         return T("LZX");
 240                 case WIMLIB_COMPRESSION_TYPE_XPRESS:
 241                         return T("XPRESS");
 242                 default:
 243                         return T("Invalid");
 244         }
 245 }
 246
 247 /*
 248  * Returns the number of an image in the WIM file, given a string that is either
 249  * the number of the image, or the name of the image.  The images are numbered
 250  * starting at 1.
 251  */
 252 WIMLIBAPI int
 253 wimlib_resolve_image(WIMStruct *w, const tchar *image_name_or_num)
 254 {
 255         tchar *p;
 256         long image;
 257         int i;
 258
 259         if (!image_name_or_num || !*image_name_or_num)
 260                 return WIMLIB_NO_IMAGE;
 261
 262         if (!tstrcasecmp(image_name_or_num, T("all"))
 263             || !tstrcasecmp(image_name_or_num, T("*")))
 264                 return WIMLIB_ALL_IMAGES;
 265         image = tstrtol(image_name_or_num, &p, 10);
 266         if (p != image_name_or_num && *p == T('\0') && image > 0) {
 267                 if (image > w->hdr.image_count)
 268                         return WIMLIB_NO_IMAGE;
 269                 return image;
 270         } else {
 271                 for (i = 1; i <= w->hdr.image_count; i++) {
 272                         if (!tstrcmp(image_name_or_num,
 273                                      wimlib_get_image_name(w, i)))
 274                                 return i;
 275                 }
 276                 return WIMLIB_NO_IMAGE;
 277         }
 278 }
 279
 280 /* Prints some basic information about a WIM file. */
 281 WIMLIBAPI void
 282 wimlib_print_wim_information(const WIMStruct *w)
 283 {
 284         const struct wim_header *hdr;
 285
 286         hdr = &w->hdr;
 287         tputs(T("WIM Information:"));
 288         tputs(T("----------------"));
 289         tprintf(T("Path:           %"TS"\n"), w->filename);
 290         tfputs(T("GUID:           0x"), stdout);
 291         print_byte_field(hdr->guid, WIM_GID_LEN, stdout);
 292         tputchar(T('\n'));
 293         tprintf(T("Image Count:    %d\n"), hdr->image_count);
 294         tprintf(T("Compression:    %"TS"\n"),
 295                 wimlib_get_compression_type_string(wimlib_get_compression_type(w)));
 296         tprintf(T("Part Number:    %d/%d\n"), hdr->part_number, hdr->total_parts);
 297         tprintf(T("Boot Index:     %d\n"), hdr->boot_idx);
 298         tprintf(T("Size:           %"PRIu64" bytes\n"),
 299                 wim_info_get_total_bytes(w->wim_info));
 300         tprintf(T("Integrity Info: %"TS"\n"),
 301                 (w->hdr.integrity.offset != 0) ? T("yes") : T("no"));
 302         tputchar(T('\n'));
 303 }
 304
 305 WIMLIBAPI bool
 306 wimlib_has_integrity_table(const WIMStruct *w)
 307 {
 308         return w->hdr.integrity.size != 0;
 309 }
 310
 311 WIMLIBAPI void
 312 wimlib_print_available_images(const WIMStruct *w, int image)
 313 {
 314         int first;
 315         int last;
 316         int i;
 317         int n;
 318         if (image == WIMLIB_ALL_IMAGES) {
 319                 n = tprintf(T("Available Images:\n"));
 320                 first = 1;
 321                 last = w->hdr.image_count;
 322         } else if (image >= 1 && image <= w->hdr.image_count) {
 323                 n = tprintf(T("Information for Image %d\n"), image);
 324                 first = image;
 325                 last = image;
 326         } else {
 327                 tprintf(T("wimlib_print_available_images(): Invalid image %d"),
 328                         image);
 329                 return;
 330         }
 331         for (i = 0; i < n - 1; i++)
 332                 tputchar(T('-'));
 333         tputchar(T('\n'));
 334         for (i = first; i <= last; i++)
 335                 print_image_info(w->wim_info, i);
 336 }
 337
 338
 339 /* Prints the metadata for the specified image, which may be WIMLIB_ALL_IMAGES, but
 340  * not WIMLIB_NO_IMAGE. */
 341 WIMLIBAPI int
 342 wimlib_print_metadata(WIMStruct *w, int image)
 343 {
 344         if (w->hdr.part_number != 1) {
 345                 ERROR("Cannot show the metadata from part %hu of a %hu-part split WIM!",
 346                        w->hdr.part_number, w->hdr.total_parts);
 347                 ERROR("Select the first part of the split WIM to see the metadata.");
 348                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 349         }
 350         return for_image(w, image, image_print_metadata);
 351 }
 352
 353 WIMLIBAPI int
 354 wimlib_print_files(WIMStruct *w, int image)
 355 {
 356         if (w->hdr.part_number != 1) {
 357                 ERROR("Cannot list the files from part %hu of a %hu-part split WIM!",
 358                        w->hdr.part_number, w->hdr.total_parts);
 359                 ERROR("Select the first part of the split WIM if you'd like to list the files.");
 360                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 361         }
 362         return for_image(w, image, image_print_files);
 363 }
 364
 365 /* Sets the index of the bootable image. */
 366 WIMLIBAPI int
 367 wimlib_set_boot_idx(WIMStruct *w, int boot_idx)
 368 {
 369         if (w->hdr.total_parts != 1) {
 370                 ERROR("Cannot modify the boot index of a split WIM!");
 371                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 372         }
 373         if (boot_idx < 0 || boot_idx > w->hdr.image_count)
 374                 return WIMLIB_ERR_INVALID_IMAGE;
 375         w->hdr.boot_idx = boot_idx;
 376         return 0;
 377 }
 378
 379 WIMLIBAPI int
 380 wimlib_get_part_number(const WIMStruct *w, int *total_parts_ret)
 381 {
 382         if (total_parts_ret)
 383                 *total_parts_ret = w->hdr.total_parts;
 384         return w->hdr.part_number;
 385 }
 386
 387
 388 WIMLIBAPI int
 389 wimlib_get_boot_idx(const WIMStruct *w)
 390 {
 391         return w->hdr.boot_idx;
 392 }
 393
 394 /*
 395  * Begins the reading of a WIM file; opens the file and reads its header and
 396  * lookup table, and optionally checks the integrity.
 397  */
 398 static int
 399 begin_read(WIMStruct *w, const tchar *in_wim_path, int open_flags,
 400            wimlib_progress_func_t progress_func)
 401 {
 402         int ret;
 403         int xml_num_images;
 404
 405         DEBUG("Reading the WIM file `%"TS"'", in_wim_path);
 406
 407         w->fp = tfopen(in_wim_path, T("rb"));
 408         if (!w->fp) {
 409                 ERROR_WITH_ERRNO("Failed to open `%"TS"' for reading",
 410                                  in_wim_path);
 411                 return WIMLIB_ERR_OPEN;
 412         }
 413
 414         /* The absolute path to the WIM is requested so that wimlib_overwrite()
 415          * still works even if the process changes its working directory.  This
 416          * actually happens if a WIM is mounted read-write, since the FUSE
 417          * thread changes directory to "/", and it needs to be able to find the
 418          * WIM file again.
 419          *
 420          * This will break if the full path to the WIM changes in the
 421          * intervening time...
 422          *
 423          * Warning: in Windows native builds, realpath() calls the replacement
 424          * function in win32.c.
 425          */
 426         w->filename = realpath(in_wim_path, NULL);
 427         if (!w->filename) {
 428                 ERROR_WITH_ERRNO("Failed to resolve WIM filename");
 429                 if (errno == ENOMEM)
 430                         return WIMLIB_ERR_NOMEM;
 431                 else
 432                         return WIMLIB_ERR_OPEN;
 433         }
 434
 435         ret = read_header(w->fp, &w->hdr, open_flags);
 436         if (ret)
 437                 return ret;
 438
 439         DEBUG("According to header, WIM contains %u images", w->hdr.image_count);
 440
 441         /* If the boot index is invalid, print a warning and set it to 0 */
 442         if (w->hdr.boot_idx > w->hdr.image_count) {
 443                 WARNING("In `%"TS"', image %u is marked as bootable, "
 444                         "but there are only %u images in the WIM",
 445                         in_wim_path, w->hdr.boot_idx, w->hdr.image_count);
 446                 w->hdr.boot_idx = 0;
 447         }
 448
 449         if (wimlib_get_compression_type(w) == WIMLIB_COMPRESSION_TYPE_INVALID) {
 450                 ERROR("Invalid compression type (WIM header flags = 0x%x)",
 451                       w->hdr.flags);
 452                 return WIMLIB_ERR_INVALID_COMPRESSION_TYPE;
 453         }
 454
 455         if (open_flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY) {
 456                 ret = check_wim_integrity(w, progress_func);
 457                 if (ret == WIM_INTEGRITY_NONEXISTENT) {
 458                         WARNING("No integrity information for `%"TS"'; skipping "
 459                                 "integrity check.", in_wim_path);
 460                 } else if (ret == WIM_INTEGRITY_NOT_OK) {
 461                         ERROR("WIM is not intact! (Failed integrity check)");
 462                         return WIMLIB_ERR_INTEGRITY;
 463                 } else if (ret != WIM_INTEGRITY_OK) {
 464                         return ret;
 465                 }
 466         }
 467
 468         if (w->hdr.image_count != 0 && w->hdr.part_number == 1) {
 469                 w->image_metadata = new_image_metadata_array(w->hdr.image_count);
 470                 if (!w->image_metadata)
 471                         return WIMLIB_ERR_NOMEM;
 472         }
 473
 474         ret = read_lookup_table(w);
 475         if (ret)
 476                 return ret;
 477
 478         ret = read_xml_data(w->fp, &w->hdr.xml_res_entry,
 479                             &w->xml_data, &w->wim_info);
 480         if (ret)
 481                 return ret;
 482
 483         xml_num_images = wim_info_get_num_images(w->wim_info);
 484         if (xml_num_images != w->hdr.image_count) {
 485                 ERROR("In the file `%"TS"', there are %u <IMAGE> elements "
 486                       "in the XML data,", in_wim_path, xml_num_images);
 487                 ERROR("but %u images in the WIM!  There must be exactly one "
 488                       "<IMAGE> element per image.", w->hdr.image_count);
 489                 return WIMLIB_ERR_IMAGE_COUNT;
 490         }
 491
 492         DEBUG("Done beginning read of WIM file `%"TS"'.", in_wim_path);
 493         return 0;
 494 }
 495
 496 /*
 497  * Opens a WIM file and creates a WIMStruct for it.
 498  */
 499 WIMLIBAPI int
 500 wimlib_open_wim(const tchar *wim_file, int open_flags,
 501                 WIMStruct **w_ret,
 502                 wimlib_progress_func_t progress_func)
 503 {
 504         WIMStruct *w;
 505         int ret;
 506
 507         if (!wim_file || !w_ret)
 508                 return WIMLIB_ERR_INVALID_PARAM;
 509
 510         w = new_wim_struct();
 511         if (!w)
 512                 return WIMLIB_ERR_NOMEM;
 513
 514         ret = begin_read(w, wim_file, open_flags, progress_func);
 515         if (ret == 0)
 516                 *w_ret = w;
 517         else
 518                 wimlib_free(w);
 519         return ret;
 520 }
 521
 522 void
 523 destroy_image_metadata(struct wim_image_metadata *imd,
 524                        struct wim_lookup_table *table,
 525                        bool free_metadata_lte)
 526 {
 527         free_dentry_tree(imd->root_dentry, table);
 528         imd->root_dentry = NULL;
 529         free_security_data(imd->security_data);
 530         imd->security_data = NULL;
 531
 532         if (free_metadata_lte) {
 533                 free_lookup_table_entry(imd->metadata_lte);
 534                 imd->metadata_lte = NULL;
 535         }
 536         if (!table) {
 537                 struct wim_lookup_table_entry *lte, *tmp;
 538                 list_for_each_entry_safe(lte, tmp, &imd->unhashed_streams, unhashed_list)
 539                         free_lookup_table_entry(lte);
 540         }
 541         INIT_LIST_HEAD(&imd->unhashed_streams);
 542         INIT_LIST_HEAD(&imd->inode_list);
 543 }
 544
 545 void
 546 put_image_metadata(struct wim_image_metadata *imd,
 547                    struct wim_lookup_table *table)
 548 {
 549         if (imd && --imd->refcnt == 0) {
 550                 destroy_image_metadata(imd, table, true);
 551                 FREE(imd);
 552         }
 553 }
 554
 555 /* Appends the specified image metadata structure to the array of image metadata
 556  * for a WIM, and increments the image count. */
 557 int
 558 append_image_metadata(WIMStruct *w, struct wim_image_metadata *imd)
 559 {
 560         struct wim_image_metadata **imd_array;
 561
 562         DEBUG("Reallocating image metadata array for image_count = %u",
 563               w->hdr.image_count + 1);
 564         imd_array = REALLOC(w->image_metadata,
 565                             sizeof(w->image_metadata[0]) * (w->hdr.image_count + 1));
 566
 567         if (!imd_array)
 568                 return WIMLIB_ERR_NOMEM;
 569         w->image_metadata = imd_array;
 570         imd_array[w->hdr.image_count++] = imd;
 571         return 0;
 572 }
 573
 574
 575 struct wim_image_metadata *
 576 new_image_metadata()
 577 {
 578         struct wim_image_metadata *imd;
 579
 580         imd = CALLOC(1, sizeof(*imd));
 581         if (imd) {
 582                 imd->refcnt = 1;
 583                 INIT_LIST_HEAD(&imd->inode_list);
 584                 INIT_LIST_HEAD(&imd->unhashed_streams);
 585                 DEBUG("Created new image metadata (refcnt=1)");
 586         } else {
 587                 ERROR_WITH_ERRNO("Failed to allocate new image metadata structure");
 588         }
 589         return imd;
 590 }
 591
 592 struct wim_image_metadata **
 593 new_image_metadata_array(unsigned num_images)
 594 {
 595         struct wim_image_metadata **imd_array;
 596
 597         DEBUG("Creating new image metadata array for %u images",
 598               num_images);
 599
 600         imd_array = CALLOC(num_images, sizeof(imd_array[0]));
 601
 602         if (!imd_array) {
 603                 ERROR("Failed to allocate memory for %u image metadata structures",
 604                       num_images);
 605                 return NULL;
 606         }
 607         for (unsigned i = 0; i < num_images; i++) {
 608                 imd_array[i] = new_image_metadata();
 609                 if (!imd_array[i]) {
 610                         for (unsigned j = 0; j < i; j++)
 611                                 put_image_metadata(imd_array[j], NULL);
 612                         FREE(imd_array);
 613                         return NULL;
 614                 }
 615         }
 616         return imd_array;
 617 }
 618
 619 /* Frees the memory for the WIMStruct, including all internal memory; also
 620  * closes all files associated with the WIMStruct.  */
 621 WIMLIBAPI void
 622 wimlib_free(WIMStruct *w)
 623 {
 624         DEBUG("Freeing WIMStruct");
 625
 626         if (!w)
 627                 return;
 628         if (w->fp)
 629                 fclose(w->fp);
 630         if (w->out_fp)
 631                 fclose(w->out_fp);
 632
 633 #ifdef WITH_FUSE
 634         if (w->fp_tab) {
 635                 for (size_t i = 0; i < w->num_allocated_fps; i++)
 636                         if (w->fp_tab[i])
 637                                 fclose(w->fp_tab[i]);
 638                 FREE(w->fp_tab);
 639         }
 640         pthread_mutex_destroy(&w->fp_tab_mutex);
 641 #endif
 642
 643         free_lookup_table(w->lookup_table);
 644
 645         FREE(w->filename);
 646         FREE(w->xml_data);
 647         free_wim_info(w->wim_info);
 648         if (w->image_metadata) {
 649                 for (unsigned i = 0; i < w->hdr.image_count; i++)
 650                         put_image_metadata(w->image_metadata[i], NULL);
 651                 FREE(w->image_metadata);
 652         }
 653 #ifdef WITH_NTFS_3G
 654         if (w->ntfs_vol) {
 655                 DEBUG("Unmounting NTFS volume");
 656                 ntfs_umount(w->ntfs_vol, FALSE);
 657         }
 658 #endif
 659         FREE(w);
 660         DEBUG("Freed WIMStruct");
 661 }
 662
 663 static bool
 664 test_locale_ctype_utf8()
 665 {
 666 #ifdef __WIN32__
 667         return false;
 668 #else
 669         char *ctype = nl_langinfo(CODESET);
 670
 671         return (!strstr(ctype, "UTF-8") ||
 672                 !strstr(ctype, "UTF8") ||
 673                 !strstr(ctype, "utf8") ||
 674                 !strstr(ctype, "utf-8"));
 675 #endif
 676 }
 677
 678 /* Get global memory allocations out of the way,
 679  * single-threaded programs like 'imagex'. */
 680 WIMLIBAPI int
 681 wimlib_global_init()
 682 {
 683         libxml_global_init();
 684 #ifdef WITH_NTFS_3G
 685         libntfs3g_global_init();
 686 #endif
 687         wimlib_mbs_is_utf8 = test_locale_ctype_utf8();
 688 #ifdef __WIN32__
 689         win32_global_init();
 690 #endif
 691         return 0;
 692 }
 693
 694 /* Free global memory allocations.  Not strictly necessary if the process using
 695  * wimlib is just about to exit (as is the case for 'imagex'). */
 696 WIMLIBAPI void
 697 wimlib_global_cleanup()
 698 {
 699         libxml_global_cleanup();
 700         iconv_global_cleanup();
 701 #ifdef __WIN32__
 702         win32_global_cleanup();
 703 #endif
 704 }