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   1 /*
   2  * extract.c
   3  *
   4  * Support for extracting WIM files.
   5  *
   6  * This code does NOT contain any filesystem-specific features.  In particular,
   7  * security information (i.e. file permissions) and alternate data streams are
   8  * ignored, except possibly to read an alternate data stream that contains
   9  * symbolic link data.
  10  */
  11
  12 /*
  13  * Copyright (C) 2010 Carl Thijssen
  14  * Copyright (C) 2012 Eric Biggers
  15  *
  16  * This file is part of wimlib, a library for working with WIM files.
  17  *
  18  * wimlib is free software; you can redistribute it and/or modify it under the
  19  * terms of the GNU General Public License as published by the Free
  20  * Software Foundation; either version 3 of the License, or (at your option)
  21  * any later version.
  22  *
  23  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  24  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  25  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  26  * details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  30  */
  31
  32
  33 #include "config.h"
  34
  35 #include <dirent.h>
  36 #include <errno.h>
  37 #include <fcntl.h>
  38 #include <string.h>
  39 #include <sys/stat.h>
  40 #include <stdlib.h>
  41 #include <sys/time.h>
  42
  43 #ifdef HAVE_UTIME_H
  44 #include <utime.h>
  45 #endif
  46
  47
  48 #include <unistd.h>
  49
  50 #include "dentry.h"
  51 #include "lookup_table.h"
  52 #include "timestamp.h"
  53 #include "wimlib_internal.h"
  54 #include "xml.h"
  55
  56 #ifdef WITH_NTFS_3G
  57 #include <ntfs-3g/volume.h>
  58 #endif
  59
  60 static int extract_regular_file_linked(struct dentry *dentry,
  61                                        const char *output_path,
  62                                        struct apply_args *args,
  63                                        struct lookup_table_entry *lte)
  64 {
  65         /* This mode overrides the normal hard-link extraction and
  66          * instead either symlinks or hardlinks *all* identical files in
  67          * the WIM, even if they are in a different image (in the case
  68          * of a multi-image extraction) */
  69
  70         if (args->extract_flags & WIMLIB_EXTRACT_FLAG_HARDLINK) {
  71                 if (link(lte->extracted_file, output_path) != 0) {
  72                         ERROR_WITH_ERRNO("Failed to hard link "
  73                                          "`%s' to `%s'",
  74                                          output_path, lte->extracted_file);
  75                         return WIMLIB_ERR_LINK;
  76                 }
  77         } else {
  78                 int num_path_components;
  79                 int num_output_dir_path_components;
  80                 size_t extracted_file_len;
  81                 char *p;
  82                 const char *p2;
  83                 size_t i;
  84
  85                 num_path_components =
  86                         get_num_path_components(dentry->full_path_utf8) - 1;
  87                 num_output_dir_path_components =
  88                         get_num_path_components(args->target);
  89
  90                 if (args->extract_flags & WIMLIB_EXTRACT_FLAG_MULTI_IMAGE) {
  91                         num_path_components++;
  92                         num_output_dir_path_components--;
  93                 }
  94                 extracted_file_len = strlen(lte->extracted_file);
  95
  96                 char buf[extracted_file_len + 3 * num_path_components + 1];
  97                 p = &buf[0];
  98
  99                 for (i = 0; i < num_path_components; i++) {
 100                         *p++ = '.';
 101                         *p++ = '.';
 102                         *p++ = '/';
 103                 }
 104                 p2 = lte->extracted_file;
 105                 while (*p2 == '/')
 106                         p2++;
 107                 while (num_output_dir_path_components--)
 108                         p2 = path_next_part(p2, NULL);
 109                 strcpy(p, p2);
 110                 if (symlink(buf, output_path) != 0) {
 111                         ERROR_WITH_ERRNO("Failed to symlink `%s' to "
 112                                          "`%s'",
 113                                          buf, lte->extracted_file);
 114                         return WIMLIB_ERR_LINK;
 115                 }
 116         }
 117         return 0;
 118 }
 119
 120 static int extract_regular_file_unlinked(struct dentry *dentry,
 121                                          struct apply_args *args,
 122                                          const char *output_path,
 123                                          struct lookup_table_entry *lte)
 124 {
 125         /* Normal mode of extraction.  Regular files and hard links are
 126          * extracted in the way that they appear in the WIM. */
 127
 128         int out_fd;
 129         int ret;
 130         struct inode *inode = dentry->d_inode;
 131
 132         if (!((args->extract_flags & WIMLIB_EXTRACT_FLAG_MULTI_IMAGE)
 133                 && (args->extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 134                                      WIMLIB_EXTRACT_FLAG_HARDLINK))))
 135         {
 136                 /* If the dentry is one of a hard link set of at least 2
 137                  * dentries and one of the other dentries has already been
 138                  * extracted, make a hard link to the file corresponding to this
 139                  * already-extracted directory.  Otherwise, extract the file,
 140                  * and set the inode->extracted_file field so that other
 141                  * dentries in the hard link group can link to it. */
 142                 if (inode->link_count > 1) {
 143                         if (inode->extracted_file) {
 144                                 DEBUG("Extracting hard link `%s' => `%s'",
 145                                       output_path, inode->extracted_file);
 146                                 if (link(inode->extracted_file, output_path) != 0) {
 147                                         ERROR_WITH_ERRNO("Failed to hard link "
 148                                                          "`%s' to `%s'",
 149                                                          output_path,
 150                                                          inode->extracted_file);
 151                                         return WIMLIB_ERR_LINK;
 152                                 }
 153                                 return 0;
 154                         }
 155                         FREE(inode->extracted_file);
 156                         inode->extracted_file = STRDUP(output_path);
 157                         if (!inode->extracted_file) {
 158                                 ERROR("Failed to allocate memory for filename");
 159                                 return WIMLIB_ERR_NOMEM;
 160                         }
 161                 }
 162         }
 163
 164         /* Extract the contents of the file to @output_path. */
 165
 166         out_fd = open(output_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 167         if (out_fd == -1) {
 168                 ERROR_WITH_ERRNO("Failed to open the file `%s' for writing",
 169                                  output_path);
 170                 return WIMLIB_ERR_OPEN;
 171         }
 172
 173         if (!lte) {
 174                 /* Empty file with no lookup table entry */
 175                 DEBUG("Empty file `%s'.", output_path);
 176                 ret = 0;
 177                 goto out;
 178         }
 179
 180         ret = extract_full_wim_resource_to_fd(lte, out_fd);
 181         if (ret != 0) {
 182                 ERROR("Failed to extract resource to `%s'", output_path);
 183                 goto out;
 184         }
 185         args->progress.extract.completed_bytes += wim_resource_size(lte);
 186 out:
 187         if (close(out_fd) != 0) {
 188                 ERROR_WITH_ERRNO("Failed to close file `%s'", output_path);
 189                 ret = WIMLIB_ERR_WRITE;
 190         }
 191         return ret;
 192 }
 193
 194 /*
 195  * Extracts a regular file from the WIM archive.
 196  */
 197 static int extract_regular_file(struct dentry *dentry,
 198                                 struct apply_args *args,
 199                                 const char *output_path)
 200 {
 201         struct lookup_table_entry *lte;
 202         const struct inode *inode = dentry->d_inode;
 203
 204         lte = inode_unnamed_lte_resolved(inode);
 205
 206         if (lte && (args->extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 207                                            WIMLIB_EXTRACT_FLAG_HARDLINK)))
 208         {
 209                 if (lte->extracted_file) {
 210                         return extract_regular_file_linked(dentry, output_path, args, lte);
 211                 } else {
 212                         lte->extracted_file = STRDUP(output_path);
 213                         if (!lte->extracted_file)
 214                                 return WIMLIB_ERR_NOMEM;
 215                 }
 216         }
 217         return extract_regular_file_unlinked(dentry, args, output_path, lte);
 218 }
 219
 220 static int extract_symlink(struct dentry *dentry,
 221                            struct apply_args *args,
 222                            const char *output_path)
 223 {
 224         char target[4096];
 225         ssize_t ret = inode_readlink(dentry->d_inode, target,
 226                                      sizeof(target), args->w, 0);
 227         struct lookup_table_entry *lte;
 228
 229         if (ret <= 0) {
 230                 ERROR("Could not read the symbolic link from dentry `%s'",
 231                       dentry->full_path_utf8);
 232                 return WIMLIB_ERR_INVALID_DENTRY;
 233         }
 234         ret = symlink(target, output_path);
 235         if (ret != 0) {
 236                 ERROR_WITH_ERRNO("Failed to symlink `%s' to `%s'",
 237                                  output_path, target);
 238                 return WIMLIB_ERR_LINK;
 239         }
 240         lte = inode_unnamed_lte_resolved(dentry->d_inode);
 241         args->progress.extract.completed_bytes += wim_resource_size(lte);
 242         return 0;
 243 }
 244
 245 /*
 246  * Extracts a directory from the WIM archive.
 247  *
 248  * @dentry:             The directory entry for the directory.
 249  * @output_path:        The path to which the directory is to be extracted to.
 250  * @return:             True on success, false on failure.
 251  */
 252 static int extract_directory(const char *output_path, bool is_root)
 253 {
 254         int ret;
 255         struct stat stbuf;
 256         ret = stat(output_path, &stbuf);
 257         if (ret == 0) {
 258                 if (S_ISDIR(stbuf.st_mode)) {
 259                         /*if (!is_root)*/
 260                                 /*WARNING("`%s' already exists", output_path);*/
 261                         return 0;
 262                 } else {
 263                         ERROR("`%s' is not a directory", output_path);
 264                         return WIMLIB_ERR_MKDIR;
 265                 }
 266         } else {
 267                 if (errno != ENOENT) {
 268                         ERROR_WITH_ERRNO("Failed to stat `%s'", output_path);
 269                         return WIMLIB_ERR_STAT;
 270                 }
 271         }
 272         /* Compute the output path directory to the directory. */
 273         if (mkdir(output_path, S_IRWXU | S_IRGRP | S_IXGRP |
 274                                S_IROTH | S_IXOTH) != 0) {
 275                 ERROR_WITH_ERRNO("Cannot create directory `%s'",
 276                                  output_path);
 277                 return WIMLIB_ERR_MKDIR;
 278         }
 279         return 0;
 280 }
 281
 282 /*
 283  * Extracts a file, directory, or symbolic link from the WIM archive.  For use
 284  * in for_dentry_in_tree().
 285  */
 286 static int apply_dentry_normal(struct dentry *dentry, void *arg)
 287 {
 288         struct apply_args *args = arg;
 289         int extract_flags = args->extract_flags;
 290         struct inode *inode = dentry->d_inode;
 291         size_t len;
 292         int ret;
 293
 294         if (dentry->is_extracted)
 295                 return 0;
 296
 297         if (extract_flags & WIMLIB_EXTRACT_FLAG_NO_STREAMS)
 298                 if (inode_unnamed_lte_resolved(inode))
 299                         return 0;
 300
 301         if (extract_flags & WIMLIB_EXTRACT_FLAG_VERBOSE)
 302                 puts(dentry->full_path_utf8);
 303
 304         len = strlen(args->target);
 305         char output_path[len + dentry->full_path_utf8_len + 1];
 306         memcpy(output_path, args->target, len);
 307         memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len);
 308         output_path[len + dentry->full_path_utf8_len] = '\0';
 309
 310         if (inode_is_symlink(inode))
 311                 ret = extract_symlink(dentry, args, output_path);
 312         else if (inode_is_directory(inode))
 313                 ret = extract_directory(output_path, false);
 314         else
 315                 ret = extract_regular_file(dentry, args, output_path);
 316         if (ret == 0)
 317                 dentry->is_extracted = 1;
 318         return ret;
 319 }
 320
 321 /* Apply timestamp to extracted file */
 322 static int apply_dentry_timestamps_normal(struct dentry *dentry, void *arg)
 323 {
 324         struct apply_args *args = arg;
 325         size_t len = strlen(args->target);
 326         char output_path[len + dentry->full_path_utf8_len + 1];
 327         const struct inode *inode = dentry->d_inode;
 328         int ret;
 329
 330         memcpy(output_path, args->target, len);
 331         memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len);
 332         output_path[len + dentry->full_path_utf8_len] = '\0';
 333
 334         struct timeval tv[2];
 335         wim_timestamp_to_timeval(inode->last_access_time, &tv[0]);
 336         wim_timestamp_to_timeval(inode->last_write_time, &tv[1]);
 337         #ifdef HAVE_LUTIMES
 338         ret = lutimes(output_path, tv);
 339         #else
 340         ret = -1;
 341         errno = ENOSYS;
 342         #endif
 343         if (ret != 0) {
 344                 #ifdef HAVE_UTIME
 345                 if (errno == ENOSYS) {
 346                         struct utimbuf buf;
 347                         buf.actime = wim_timestamp_to_unix(inode->last_access_time);
 348                         buf.modtime = wim_timestamp_to_unix(inode->last_write_time);
 349                         if (utime(output_path, &buf) == 0)
 350                                 return 0;
 351                 }
 352                 #endif
 353                 if (errno != ENOSYS || args->num_lutimes_warnings < 10) {
 354                         /*WARNING("Failed to set timestamp on file `%s': %s",*/
 355                                 /*output_path, strerror(errno));*/
 356                         args->num_lutimes_warnings++;
 357                 }
 358         }
 359         return 0;
 360 }
 361
 362 static int cmp_streams_by_wim_position(const void *p1, const void *p2)
 363 {
 364         const struct lookup_table_entry *lte1, *lte2;
 365         lte1 = *(const struct lookup_table_entry**)p1;
 366         lte2 = *(const struct lookup_table_entry**)p2;
 367         if (lte1->resource_entry.offset < lte2->resource_entry.offset)
 368                 return -1;
 369         else if (lte1->resource_entry.offset > lte2->resource_entry.offset)
 370                 return 1;
 371         else
 372                 return 0;
 373 }
 374
 375 static int sort_stream_list_by_wim_position(struct list_head *stream_list)
 376 {
 377         struct list_head *cur;
 378         size_t num_streams;
 379         struct lookup_table_entry **array;
 380         size_t i;
 381         size_t array_size;
 382
 383         num_streams = 0;
 384         list_for_each(cur, stream_list)
 385                 num_streams++;
 386         array_size = num_streams * sizeof(array[0]);
 387         array = MALLOC(array_size);
 388         if (!array) {
 389                 ERROR("Failed to allocate %zu bytes to sort stream entries",
 390                       array_size);
 391                 return WIMLIB_ERR_NOMEM;
 392         }
 393         cur = stream_list->next;
 394         for (i = 0; i < num_streams; i++) {
 395                 array[i] = container_of(cur, struct lookup_table_entry, staging_list);
 396                 cur = cur->next;
 397         }
 398
 399         qsort(array, num_streams, sizeof(array[0]), cmp_streams_by_wim_position);
 400
 401         INIT_LIST_HEAD(stream_list);
 402         for (i = 0; i < num_streams; i++)
 403                 list_add_tail(&array[i]->staging_list, stream_list);
 404         FREE(array);
 405         return 0;
 406 }
 407
 408 static void calculate_bytes_to_extract(struct list_head *stream_list,
 409                                        int extract_flags,
 410                                        union wimlib_progress_info *progress)
 411 {
 412         struct lookup_table_entry *lte;
 413         struct inode *inode;
 414         u64 total_bytes = 0;
 415         u64 num_streams = 0;
 416
 417         /* For each stream to be extracted... */
 418         list_for_each_entry(lte, stream_list, staging_list) {
 419                 if (extract_flags &
 420                     (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
 421                 {
 422                         /* In the symlink or hard link extraction mode, each
 423                          * stream will be extracted one time regardless of how
 424                          * many dentries share the stream. */
 425                         wimlib_assert(!(extract_flags & WIMLIB_EXTRACT_FLAG_NTFS));
 426                         if (!lte->extracted_file) {
 427                                 num_streams++;
 428                                 total_bytes += wim_resource_size(lte);
 429                         }
 430                 } else {
 431                         list_for_each_entry(inode, &lte->inode_list,
 432                                             lte_inode_list)
 433                         {
 434                                 num_streams++;
 435                                 total_bytes += wim_resource_size(lte);
 436                         }
 437                 }
 438         }
 439         progress->extract.num_streams = num_streams;
 440         progress->extract.total_bytes = total_bytes;
 441         progress->extract.completed_bytes = 0;
 442 }
 443
 444 static void maybe_add_stream_for_extraction(struct lookup_table_entry *lte,
 445                                             struct list_head *stream_list)
 446 {
 447         if (lte->out_refcnt == 0) {
 448                 lte->out_refcnt = 1;
 449                 INIT_LIST_HEAD(&lte->inode_list);
 450                 list_add_tail(&lte->staging_list, stream_list);
 451         }
 452 }
 453
 454 static void inode_find_streams_for_extraction(struct inode *inode,
 455                                               struct list_head *stream_list,
 456                                               int extract_flags)
 457 {
 458         struct lookup_table_entry *lte;
 459         bool inode_added = false;
 460
 461         lte = inode_unnamed_lte_resolved(inode);
 462
 463         if (lte) {
 464                 maybe_add_stream_for_extraction(lte, stream_list);
 465                 list_add_tail(&inode->lte_inode_list, &lte->inode_list);
 466                 inode_added = true;
 467         }
 468 #ifdef WITH_NTFS_3G
 469         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 470                 for (unsigned i = 0; i < inode->num_ads; i++) {
 471                         if (inode->ads_entries[i].stream_name_len != 0) {
 472                                 lte = inode_stream_lte_resolved(inode, i + 1);
 473                                 if (lte) {
 474                                         maybe_add_stream_for_extraction(lte,
 475                                                                         stream_list);
 476                                         if (!inode_added) {
 477                                                 list_add_tail(&inode->lte_inode_list,
 478                                                               &lte->inode_list);
 479                                                 inode_added = true;
 480                                         }
 481                                 }
 482                         }
 483                 }
 484         }
 485 #endif
 486 }
 487
 488 static void find_streams_for_extraction(struct hlist_head *inode_list,
 489                                         struct list_head *stream_list,
 490                                         struct lookup_table *lookup_table,
 491                                         int extract_flags)
 492 {
 493         struct inode *inode;
 494         struct hlist_node *cur;
 495         struct dentry *dentry;
 496
 497         for_lookup_table_entry(lookup_table, lte_zero_out_refcnt, NULL);
 498         INIT_LIST_HEAD(stream_list);
 499         hlist_for_each_entry(inode, cur, inode_list, hlist) {
 500                 if (!inode->resolved)
 501                         inode_resolve_ltes(inode, lookup_table);
 502                 inode_for_each_dentry(dentry, inode)
 503                         dentry->is_extracted = 0;
 504                 inode_find_streams_for_extraction(inode, stream_list,
 505                                                   extract_flags);
 506         }
 507 }
 508
 509 struct apply_operations {
 510         int (*apply_dentry)(struct dentry *dentry, void *arg);
 511         int (*apply_dentry_timestamps)(struct dentry *dentry, void *arg);
 512 };
 513
 514 static const struct apply_operations normal_apply_operations = {
 515         .apply_dentry = apply_dentry_normal,
 516         .apply_dentry_timestamps = apply_dentry_timestamps_normal,
 517 };
 518
 519 #ifdef WITH_NTFS_3G
 520 static const struct apply_operations ntfs_apply_operations = {
 521         .apply_dentry = wim_apply_dentry_ntfs,
 522         .apply_dentry_timestamps = wim_apply_dentry_timestamps,
 523 };
 524 #endif
 525
 526 static int apply_stream_list(struct list_head *stream_list,
 527                              struct apply_args *args,
 528                              const struct apply_operations *ops,
 529                              wimlib_progress_func_t progress_func)
 530 {
 531         uint64_t bytes_per_progress = args->progress.extract.total_bytes / 100;
 532         uint64_t next_progress = bytes_per_progress;
 533         struct lookup_table_entry *lte;
 534         struct inode *inode;
 535         struct dentry *dentry;
 536         int ret = 0;
 537         list_for_each_entry(lte, stream_list, staging_list) {
 538                 list_for_each_entry(inode, &lte->inode_list, lte_inode_list) {
 539                         inode_for_each_dentry(dentry, inode) {
 540                                 ret = ops->apply_dentry(dentry, args);
 541                                 if (ret != 0)
 542                                         goto out;
 543                                 if (args->progress.extract.completed_bytes >= next_progress) {
 544                                         progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS,
 545                                                       &args->progress);
 546                                         next_progress += bytes_per_progress;
 547                                 }
 548                         }
 549                 }
 550         }
 551 out:
 552         return ret;
 553 }
 554
 555 static int extract_single_image(WIMStruct *w, int image,
 556                                 const char *target, int extract_flags,
 557                                 wimlib_progress_func_t progress_func)
 558 {
 559         int ret;
 560         struct list_head stream_list;
 561         struct hlist_head *inode_list;
 562
 563         struct apply_args args;
 564         const struct apply_operations *ops;
 565
 566         args.w                    = w;
 567         args.target               = target;
 568         args.extract_flags        = extract_flags;
 569         args.num_lutimes_warnings = 0;
 570         args.target               = target;
 571         args.stream_list          = &stream_list;
 572
 573         if (progress_func) {
 574                 args.progress.extract.image      = image;
 575                 args.progress.extract.image_name = wimlib_get_image_name(w, image);
 576                 args.progress.extract.target     = target;
 577         }
 578
 579 #ifdef WITH_NTFS_3G
 580         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 581                 args.vol = ntfs_mount(target, 0);
 582                 if (!args.vol) {
 583                         ERROR_WITH_ERRNO("Failed to mount NTFS volume `%s'", target);
 584                         return WIMLIB_ERR_NTFS_3G;
 585                 }
 586         }
 587 #endif
 588
 589 #ifdef WITH_NTFS_3G
 590         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS)
 591                 ops = &ntfs_apply_operations;
 592         else
 593 #endif
 594                 ops = &normal_apply_operations;
 595
 596         ret = select_wim_image(w, image);
 597         if (ret != 0)
 598                 goto out;
 599
 600         inode_list = &w->image_metadata[image - 1].inode_list;
 601         find_streams_for_extraction(inode_list,
 602                                     &stream_list,
 603                                     w->lookup_table,
 604                                     extract_flags);
 605
 606         calculate_bytes_to_extract(&stream_list, extract_flags,
 607                                    &args.progress);
 608
 609         if (progress_func) {
 610                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN,
 611                               &args.progress);
 612         }
 613
 614         if (extract_flags & WIMLIB_EXTRACT_FLAG_SEQUENTIAL) {
 615                 ret = sort_stream_list_by_wim_position(&stream_list);
 616                 if (ret != 0) {
 617                         WARNING("Falling back to non-sequential extraction");
 618                         extract_flags &= ~WIMLIB_EXTRACT_FLAG_SEQUENTIAL;
 619                 }
 620         }
 621
 622         if (progress_func) {
 623                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_BEGIN,
 624                               &args.progress);
 625         }
 626
 627
 628         args.extract_flags |= WIMLIB_EXTRACT_FLAG_NO_STREAMS;
 629         ret = for_dentry_in_tree(wim_root_dentry(w), ops->apply_dentry, &args);
 630         args.extract_flags &= ~WIMLIB_EXTRACT_FLAG_NO_STREAMS;
 631         if (ret != 0)
 632                 goto out;
 633
 634         if (progress_func) {
 635                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_END,
 636                               &args.progress);
 637         }
 638
 639         ret = apply_stream_list(&stream_list, &args, ops, progress_func);
 640         if (ret != 0)
 641                 goto out;
 642
 643         if (progress_func)
 644                 progress_func(WIMLIB_PROGRESS_MSG_APPLY_TIMESTAMPS, NULL);
 645
 646         ret = for_dentry_in_tree_depth(wim_root_dentry(w),
 647                                        ops->apply_dentry_timestamps, &args);
 648         if (ret != 0)
 649                 goto out;
 650
 651         if (progress_func) {
 652                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_END,
 653                               &args.progress);
 654         }
 655 out:
 656 #ifdef WITH_NTFS_3G
 657         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 658                 if (ntfs_umount(args.vol, FALSE) != 0) {
 659                         ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%s'", args.target);
 660                         if (ret == 0)
 661                                 ret = WIMLIB_ERR_NTFS_3G;
 662                 }
 663         }
 664 #endif
 665         return ret;
 666 }
 667
 668
 669 /* Extracts all images from the WIM to @output_dir, with the images placed in
 670  * subdirectories named by their image names. */
 671 static int extract_all_images(WIMStruct *w, const char *target,
 672                               int extract_flags,
 673                               wimlib_progress_func_t progress_func)
 674 {
 675         size_t image_name_max_len = max(xml_get_max_image_name_len(w), 20);
 676         size_t output_path_len = strlen(target);
 677         char buf[output_path_len + 1 + image_name_max_len + 1];
 678         int ret;
 679         int image;
 680         const char *image_name;
 681
 682         ret = extract_directory(target, true);
 683         if (ret != 0)
 684                 return ret;
 685
 686         memcpy(buf, target, output_path_len);
 687         buf[output_path_len] = '/';
 688         for (image = 1; image <= w->hdr.image_count; image++) {
 689                 image_name = wimlib_get_image_name(w, image);
 690                 if (image_name && *image_name) {
 691                         strcpy(buf + output_path_len + 1, image_name);
 692                 } else {
 693                         /* Image name is empty. Use image number instead */
 694                         sprintf(buf + output_path_len + 1, "%d", image);
 695                 }
 696                 ret = extract_single_image(w, image, buf, extract_flags,
 697                                            progress_func);
 698                 if (ret != 0)
 699                         return ret;
 700         }
 701         return 0;
 702 }
 703
 704 /* Extracts a single image or all images from a WIM file. */
 705 WIMLIBAPI int wimlib_extract_image(WIMStruct *w, int image,
 706                                    const char *target,
 707                                    int extract_flags,
 708                                    WIMStruct **additional_swms,
 709                                    unsigned num_additional_swms,
 710                                    wimlib_progress_func_t progress_func)
 711 {
 712         struct lookup_table *joined_tab, *w_tab_save;
 713         int ret;
 714
 715         if (!w || !target)
 716                 return WIMLIB_ERR_INVALID_PARAM;
 717
 718         extract_flags &= WIMLIB_EXTRACT_MASK_PUBLIC;
 719
 720         if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
 721                         == (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
 722                 return WIMLIB_ERR_INVALID_PARAM;
 723
 724         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 725 #ifdef WITH_NTFS_3G
 726                 if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))) {
 727                         ERROR("Cannot specify symlink or hardlink flags when applying ");
 728                         ERROR("directly to a NTFS volume");
 729                         return WIMLIB_ERR_INVALID_PARAM;
 730                 }
 731                 if (image == WIMLIB_ALL_IMAGES) {
 732                         ERROR("Can only apply a single image when applying "
 733                               "directly to a NTFS volume");
 734                         return WIMLIB_ERR_INVALID_PARAM;
 735                 }
 736 #else
 737                 ERROR("wimlib was compiled without support for NTFS-3g, so");
 738                 ERROR("we cannot apply a WIM image directly to a NTFS volume");
 739                 return WIMLIB_ERR_UNSUPPORTED;
 740 #endif
 741         }
 742
 743         ret = verify_swm_set(w, additional_swms, num_additional_swms);
 744         if (ret != 0)
 745                 return ret;
 746
 747         if (num_additional_swms) {
 748                 ret = new_joined_lookup_table(w, additional_swms,
 749                                               num_additional_swms, &joined_tab);
 750                 if (ret != 0)
 751                         return ret;
 752                 w_tab_save = w->lookup_table;
 753                 w->lookup_table = joined_tab;
 754         }
 755
 756         if (image == WIMLIB_ALL_IMAGES) {
 757                 extract_flags |= WIMLIB_EXTRACT_FLAG_MULTI_IMAGE;
 758                 ret = extract_all_images(w, target, extract_flags,
 759                                          progress_func);
 760         } else {
 761                 extract_flags &= ~WIMLIB_EXTRACT_FLAG_MULTI_IMAGE;
 762                 ret = extract_single_image(w, image, target, extract_flags,
 763                                            progress_func);
 764         }
 765
 766         if (extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 767                              WIMLIB_EXTRACT_FLAG_HARDLINK))
 768         {
 769                 for_lookup_table_entry(w->lookup_table,
 770                                        lte_free_extracted_file,
 771                                        NULL);
 772         }
 773
 774         if (num_additional_swms) {
 775                 free_lookup_table(w->lookup_table);
 776                 w->lookup_table = w_tab_save;
 777         }
 778         return ret;
 779 }