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   1 /*
   2  * extract_image.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) 2012 Eric Biggers
  14  *
  15  * This file is part of wimlib, a library for working with WIM files.
  16  *
  17  * wimlib is free software; you can redistribute it and/or modify it under the
  18  * terms of the GNU General Public License as published by the Free
  19  * Software Foundation; either version 3 of the License, or (at your option)
  20  * any later version.
  21  *
  22  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  23  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  24  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  25  * details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  29  */
  30
  31 #include "config.h"
  32
  33 #include <dirent.h>
  34 #include <errno.h>
  35 #include <fcntl.h>
  36 #include <string.h>
  37 #include <sys/stat.h>
  38 #include <stdlib.h>
  39 #include <sys/time.h>
  40
  41 #ifdef HAVE_UTIME_H
  42 #include <utime.h>
  43 #endif
  44
  45 #include <unistd.h>
  46
  47 #include "dentry.h"
  48 #include "lookup_table.h"
  49 #include "timestamp.h"
  50 #include "wimlib_internal.h"
  51 #include "xml.h"
  52
  53 #ifdef WITH_NTFS_3G
  54 #include <ntfs-3g/volume.h>
  55 #endif
  56
  57 static int extract_regular_file_linked(struct dentry *dentry,
  58                                        const char *output_path,
  59                                        struct apply_args *args,
  60                                        struct lookup_table_entry *lte)
  61 {
  62         /* This mode overrides the normal hard-link extraction and
  63          * instead either symlinks or hardlinks *all* identical files in
  64          * the WIM, even if they are in a different image (in the case
  65          * of a multi-image extraction) */
  66
  67         if (args->extract_flags & WIMLIB_EXTRACT_FLAG_HARDLINK) {
  68                 if (link(lte->extracted_file, output_path) != 0) {
  69                         ERROR_WITH_ERRNO("Failed to hard link "
  70                                          "`%s' to `%s'",
  71                                          output_path, lte->extracted_file);
  72                         return WIMLIB_ERR_LINK;
  73                 }
  74         } else {
  75                 int num_path_components;
  76                 int num_output_dir_path_components;
  77                 size_t extracted_file_len;
  78                 char *p;
  79                 const char *p2;
  80                 size_t i;
  81
  82                 num_path_components =
  83                         get_num_path_components(dentry->full_path_utf8) - 1;
  84                 num_output_dir_path_components =
  85                         get_num_path_components(args->target);
  86
  87                 if (args->extract_flags & WIMLIB_EXTRACT_FLAG_MULTI_IMAGE) {
  88                         num_path_components++;
  89                         num_output_dir_path_components--;
  90                 }
  91                 extracted_file_len = strlen(lte->extracted_file);
  92
  93                 char buf[extracted_file_len + 3 * num_path_components + 1];
  94                 p = &buf[0];
  95
  96                 for (i = 0; i < num_path_components; i++) {
  97                         *p++ = '.';
  98                         *p++ = '.';
  99                         *p++ = '/';
 100                 }
 101                 p2 = lte->extracted_file;
 102                 while (*p2 == '/')
 103                         p2++;
 104                 while (num_output_dir_path_components--)
 105                         p2 = path_next_part(p2, NULL);
 106                 strcpy(p, p2);
 107                 if (symlink(buf, output_path) != 0) {
 108                         ERROR_WITH_ERRNO("Failed to symlink `%s' to "
 109                                          "`%s'",
 110                                          buf, lte->extracted_file);
 111                         return WIMLIB_ERR_LINK;
 112                 }
 113         }
 114         return 0;
 115 }
 116
 117 static int extract_regular_file_unlinked(struct dentry *dentry,
 118                                          struct apply_args *args,
 119                                          const char *output_path,
 120                                          struct lookup_table_entry *lte)
 121 {
 122         /* Normal mode of extraction.  Regular files and hard links are
 123          * extracted in the way that they appear in the WIM. */
 124
 125         int out_fd;
 126         int ret;
 127         struct inode *inode = dentry->d_inode;
 128
 129         if (!((args->extract_flags & WIMLIB_EXTRACT_FLAG_MULTI_IMAGE)
 130                 && (args->extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 131                                      WIMLIB_EXTRACT_FLAG_HARDLINK))))
 132         {
 133                 /* If the dentry is one of a hard link set of at least 2
 134                  * dentries and one of the other dentries has already been
 135                  * extracted, make a hard link to the file corresponding to this
 136                  * already-extracted directory.  Otherwise, extract the file,
 137                  * and set the inode->extracted_file field so that other
 138                  * dentries in the hard link group can link to it. */
 139                 if (inode->link_count > 1) {
 140                         if (inode->extracted_file) {
 141                                 DEBUG("Extracting hard link `%s' => `%s'",
 142                                       output_path, inode->extracted_file);
 143                                 if (link(inode->extracted_file, output_path) != 0) {
 144                                         ERROR_WITH_ERRNO("Failed to hard link "
 145                                                          "`%s' to `%s'",
 146                                                          output_path,
 147                                                          inode->extracted_file);
 148                                         return WIMLIB_ERR_LINK;
 149                                 }
 150                                 return 0;
 151                         }
 152                         FREE(inode->extracted_file);
 153                         inode->extracted_file = STRDUP(output_path);
 154                         if (!inode->extracted_file) {
 155                                 ERROR("Failed to allocate memory for filename");
 156                                 return WIMLIB_ERR_NOMEM;
 157                         }
 158                 }
 159         }
 160
 161         /* Extract the contents of the file to @output_path. */
 162
 163         out_fd = open(output_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 164         if (out_fd == -1) {
 165                 ERROR_WITH_ERRNO("Failed to open the file `%s' for writing",
 166                                  output_path);
 167                 return WIMLIB_ERR_OPEN;
 168         }
 169
 170         if (!lte) {
 171                 /* Empty file with no lookup table entry */
 172                 DEBUG("Empty file `%s'.", output_path);
 173                 ret = 0;
 174                 goto out;
 175         }
 176
 177         ret = extract_full_wim_resource_to_fd(lte, out_fd);
 178         if (ret != 0) {
 179                 ERROR("Failed to extract resource to `%s'", output_path);
 180                 goto out;
 181         }
 182         args->progress.extract.completed_bytes += wim_resource_size(lte);
 183 out:
 184         if (close(out_fd) != 0) {
 185                 ERROR_WITH_ERRNO("Failed to close file `%s'", output_path);
 186                 ret = WIMLIB_ERR_WRITE;
 187         }
 188         return ret;
 189 }
 190
 191 /*
 192  * Extracts a regular file from the WIM archive.
 193  */
 194 static int extract_regular_file(struct dentry *dentry,
 195                                 struct apply_args *args,
 196                                 const char *output_path)
 197 {
 198         struct lookup_table_entry *lte;
 199         const struct inode *inode = dentry->d_inode;
 200
 201         lte = inode_unnamed_lte_resolved(inode);
 202
 203         if (lte && (args->extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 204                                            WIMLIB_EXTRACT_FLAG_HARDLINK)))
 205         {
 206                 if (lte->extracted_file) {
 207                         return extract_regular_file_linked(dentry, output_path, args, lte);
 208                 } else {
 209                         lte->extracted_file = STRDUP(output_path);
 210                         if (!lte->extracted_file)
 211                                 return WIMLIB_ERR_NOMEM;
 212                 }
 213         }
 214         return extract_regular_file_unlinked(dentry, args, output_path, lte);
 215 }
 216
 217 static int extract_symlink(struct dentry *dentry,
 218                            struct apply_args *args,
 219                            const char *output_path)
 220 {
 221         char target[4096];
 222         ssize_t ret = inode_readlink(dentry->d_inode, target,
 223                                      sizeof(target), args->w, 0);
 224         struct lookup_table_entry *lte;
 225
 226         if (ret <= 0) {
 227                 ERROR("Could not read the symbolic link from dentry `%s'",
 228                       dentry->full_path_utf8);
 229                 return WIMLIB_ERR_INVALID_DENTRY;
 230         }
 231         ret = symlink(target, output_path);
 232         if (ret != 0) {
 233                 ERROR_WITH_ERRNO("Failed to symlink `%s' to `%s'",
 234                                  output_path, target);
 235                 return WIMLIB_ERR_LINK;
 236         }
 237         lte = inode_unnamed_lte_resolved(dentry->d_inode);
 238         args->progress.extract.completed_bytes += wim_resource_size(lte);
 239         return 0;
 240 }
 241
 242 /*
 243  * Extracts a directory from the WIM archive.
 244  *
 245  * @dentry:             The directory entry for the directory.
 246  * @output_path:        The path to which the directory is to be extracted to.
 247  * @return:             True on success, false on failure.
 248  */
 249 static int extract_directory(const char *output_path, bool is_root)
 250 {
 251         int ret;
 252         struct stat stbuf;
 253         ret = stat(output_path, &stbuf);
 254         if (ret == 0) {
 255                 if (S_ISDIR(stbuf.st_mode)) {
 256                         /*if (!is_root)*/
 257                                 /*WARNING("`%s' already exists", output_path);*/
 258                         return 0;
 259                 } else {
 260                         ERROR("`%s' is not a directory", output_path);
 261                         return WIMLIB_ERR_MKDIR;
 262                 }
 263         } else {
 264                 if (errno != ENOENT) {
 265                         ERROR_WITH_ERRNO("Failed to stat `%s'", output_path);
 266                         return WIMLIB_ERR_STAT;
 267                 }
 268         }
 269         /* Compute the output path directory to the directory. */
 270         if (mkdir(output_path, S_IRWXU | S_IRGRP | S_IXGRP |
 271                                S_IROTH | S_IXOTH) != 0) {
 272                 ERROR_WITH_ERRNO("Cannot create directory `%s'",
 273                                  output_path);
 274                 return WIMLIB_ERR_MKDIR;
 275         }
 276         return 0;
 277 }
 278
 279 /*
 280  * Extracts a file, directory, or symbolic link from the WIM archive.  For use
 281  * in for_dentry_in_tree().
 282  */
 283 static int apply_dentry_normal(struct dentry *dentry, void *arg)
 284 {
 285         struct apply_args *args = arg;
 286         int extract_flags = args->extract_flags;
 287         struct inode *inode = dentry->d_inode;
 288         size_t len;
 289         int ret;
 290
 291         if (dentry->is_extracted)
 292                 return 0;
 293
 294         if (extract_flags & WIMLIB_EXTRACT_FLAG_NO_STREAMS)
 295                 if (inode_unnamed_lte_resolved(inode))
 296                         return 0;
 297
 298         if ((extract_flags & WIMLIB_EXTRACT_FLAG_VERBOSE) &&
 299              args->progress_func)
 300         {
 301                 args->progress.extract.cur_path = dentry->full_path_utf8;
 302                 args->progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DENTRY,
 303                                     &args->progress);
 304         }
 305
 306         len = strlen(args->target);
 307         char output_path[len + dentry->full_path_utf8_len + 1];
 308         memcpy(output_path, args->target, len);
 309         memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len);
 310         output_path[len + dentry->full_path_utf8_len] = '\0';
 311
 312         if (inode_is_symlink(inode))
 313                 ret = extract_symlink(dentry, args, output_path);
 314         else if (inode_is_directory(inode))
 315                 ret = extract_directory(output_path, false);
 316         else
 317                 ret = extract_regular_file(dentry, args, output_path);
 318         if (ret == 0)
 319                 dentry->is_extracted = 1;
 320         return ret;
 321 }
 322
 323 /* Apply timestamp to extracted file */
 324 static int apply_dentry_timestamps_normal(struct dentry *dentry, void *arg)
 325 {
 326         struct apply_args *args = arg;
 327         size_t len = strlen(args->target);
 328         char output_path[len + dentry->full_path_utf8_len + 1];
 329         const struct inode *inode = dentry->d_inode;
 330         int ret;
 331
 332         memcpy(output_path, args->target, len);
 333         memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len);
 334         output_path[len + dentry->full_path_utf8_len] = '\0';
 335
 336         struct timeval tv[2];
 337         wim_timestamp_to_timeval(inode->last_access_time, &tv[0]);
 338         wim_timestamp_to_timeval(inode->last_write_time, &tv[1]);
 339         #ifdef HAVE_LUTIMES
 340         ret = lutimes(output_path, tv);
 341         #else
 342         ret = -1;
 343         errno = ENOSYS;
 344         #endif
 345         if (ret != 0) {
 346                 #ifdef HAVE_UTIME
 347                 if (errno == ENOSYS) {
 348                         struct utimbuf buf;
 349                         buf.actime = wim_timestamp_to_unix(inode->last_access_time);
 350                         buf.modtime = wim_timestamp_to_unix(inode->last_write_time);
 351                         if (utime(output_path, &buf) == 0)
 352                                 return 0;
 353                 }
 354                 #endif
 355                 if (errno != ENOSYS || args->num_lutimes_warnings < 10) {
 356                         /*WARNING("Failed to set timestamp on file `%s': %s",*/
 357                                 /*output_path, strerror(errno));*/
 358                         args->num_lutimes_warnings++;
 359                 }
 360         }
 361         return 0;
 362 }
 363
 364 static int cmp_streams_by_wim_position(const void *p1, const void *p2)
 365 {
 366         const struct lookup_table_entry *lte1, *lte2;
 367         lte1 = *(const struct lookup_table_entry**)p1;
 368         lte2 = *(const struct lookup_table_entry**)p2;
 369         if (lte1->resource_entry.offset < lte2->resource_entry.offset)
 370                 return -1;
 371         else if (lte1->resource_entry.offset > lte2->resource_entry.offset)
 372                 return 1;
 373         else
 374                 return 0;
 375 }
 376
 377 static int sort_stream_list_by_wim_position(struct list_head *stream_list)
 378 {
 379         struct list_head *cur;
 380         size_t num_streams;
 381         struct lookup_table_entry **array;
 382         size_t i;
 383         size_t array_size;
 384
 385         num_streams = 0;
 386         list_for_each(cur, stream_list)
 387                 num_streams++;
 388         array_size = num_streams * sizeof(array[0]);
 389         array = MALLOC(array_size);
 390         if (!array) {
 391                 ERROR("Failed to allocate %zu bytes to sort stream entries",
 392                       array_size);
 393                 return WIMLIB_ERR_NOMEM;
 394         }
 395         cur = stream_list->next;
 396         for (i = 0; i < num_streams; i++) {
 397                 array[i] = container_of(cur, struct lookup_table_entry, staging_list);
 398                 cur = cur->next;
 399         }
 400
 401         qsort(array, num_streams, sizeof(array[0]), cmp_streams_by_wim_position);
 402
 403         INIT_LIST_HEAD(stream_list);
 404         for (i = 0; i < num_streams; i++)
 405                 list_add_tail(&array[i]->staging_list, stream_list);
 406         FREE(array);
 407         return 0;
 408 }
 409
 410 static void calculate_bytes_to_extract(struct list_head *stream_list,
 411                                        int extract_flags,
 412                                        union wimlib_progress_info *progress)
 413 {
 414         struct lookup_table_entry *lte;
 415         u64 total_bytes = 0;
 416         u64 num_streams = 0;
 417
 418         /* For each stream to be extracted... */
 419         list_for_each_entry(lte, stream_list, staging_list) {
 420                 if (extract_flags &
 421                     (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
 422                 {
 423                         /* In the symlink or hard link extraction mode, each
 424                          * stream will be extracted one time regardless of how
 425                          * many dentries share the stream. */
 426                         wimlib_assert(!(extract_flags & WIMLIB_EXTRACT_FLAG_NTFS));
 427                         if (!lte->extracted_file) {
 428                                 num_streams++;
 429                                 total_bytes += wim_resource_size(lte);
 430                         }
 431                 } else {
 432                         num_streams += lte->out_refcnt;
 433                         total_bytes += lte->out_refcnt * wim_resource_size(lte);
 434                 }
 435         }
 436         progress->extract.num_streams = num_streams;
 437         progress->extract.total_bytes = total_bytes;
 438         progress->extract.completed_bytes = 0;
 439 }
 440
 441 static void maybe_add_stream_for_extraction(struct lookup_table_entry *lte,
 442                                             struct list_head *stream_list)
 443 {
 444         if (++lte->out_refcnt == 1) {
 445                 INIT_LIST_HEAD(&lte->inode_list);
 446                 list_add_tail(&lte->staging_list, stream_list);
 447         }
 448 }
 449
 450 static void inode_find_streams_for_extraction(struct inode *inode,
 451                                               struct list_head *stream_list,
 452                                               int extract_flags)
 453 {
 454         struct lookup_table_entry *lte;
 455         bool inode_added = false;
 456
 457         lte = inode_unnamed_lte_resolved(inode);
 458
 459         if (lte) {
 460                 maybe_add_stream_for_extraction(lte, stream_list);
 461                 list_add_tail(&inode->lte_inode_list, &lte->inode_list);
 462                 inode_added = true;
 463         }
 464 #ifdef WITH_NTFS_3G
 465         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 466                 for (unsigned i = 0; i < inode->num_ads; i++) {
 467                         if (inode->ads_entries[i].stream_name_len != 0) {
 468                                 lte = inode->ads_entries[i].lte;
 469                                 if (lte) {
 470                                         maybe_add_stream_for_extraction(lte,
 471                                                                         stream_list);
 472                                         if (!inode_added) {
 473                                                 list_add_tail(&inode->lte_inode_list,
 474                                                               &lte->inode_list);
 475                                                 inode_added = true;
 476                                         }
 477                                 }
 478                         }
 479                 }
 480         }
 481 #endif
 482 }
 483
 484 static void find_streams_for_extraction(struct hlist_head *inode_list,
 485                                         struct list_head *stream_list,
 486                                         struct lookup_table *lookup_table,
 487                                         int extract_flags)
 488 {
 489         struct inode *inode;
 490         struct hlist_node *cur;
 491         struct dentry *dentry;
 492
 493         for_lookup_table_entry(lookup_table, lte_zero_out_refcnt, NULL);
 494         INIT_LIST_HEAD(stream_list);
 495         hlist_for_each_entry(inode, cur, inode_list, hlist) {
 496                 if (!inode->resolved)
 497                         inode_resolve_ltes(inode, lookup_table);
 498                 inode_for_each_dentry(dentry, inode)
 499                         dentry->is_extracted = 0;
 500                 inode_find_streams_for_extraction(inode, stream_list,
 501                                                   extract_flags);
 502         }
 503 }
 504
 505 struct apply_operations {
 506         int (*apply_dentry)(struct dentry *dentry, void *arg);
 507         int (*apply_dentry_timestamps)(struct dentry *dentry, void *arg);
 508 };
 509
 510 static const struct apply_operations normal_apply_operations = {
 511         .apply_dentry = apply_dentry_normal,
 512         .apply_dentry_timestamps = apply_dentry_timestamps_normal,
 513 };
 514
 515 #ifdef WITH_NTFS_3G
 516 static const struct apply_operations ntfs_apply_operations = {
 517         .apply_dentry = apply_dentry_ntfs,
 518         .apply_dentry_timestamps = apply_dentry_timestamps_ntfs,
 519 };
 520 #endif
 521
 522 static int apply_stream_list(struct list_head *stream_list,
 523                              struct apply_args *args,
 524                              const struct apply_operations *ops,
 525                              wimlib_progress_func_t progress_func)
 526 {
 527         uint64_t bytes_per_progress = args->progress.extract.total_bytes / 100;
 528         uint64_t next_progress = bytes_per_progress;
 529         struct lookup_table_entry *lte;
 530         struct inode *inode;
 531         struct dentry *dentry;
 532         int ret = 0;
 533
 534         /* This complicated loop is actually just looping through the dentries
 535          * (as for_dentry_in_tree() does), but the outer loop is actually over
 536          * the distinct streams to be extracted so that sequential reading of
 537          * the WIM can be implemented. */
 538
 539         /* For each distinct stream to be extracted */
 540         list_for_each_entry(lte, stream_list, staging_list) {
 541                 /* For each inode that contains the stream */
 542                 list_for_each_entry(inode, &lte->inode_list, lte_inode_list) {
 543                         /* For each dentry that points to the inode */
 544                         inode_for_each_dentry(dentry, inode) {
 545                                 ret = ops->apply_dentry(dentry, args);
 546                                 if (ret != 0)
 547                                         goto out;
 548                                 if (progress_func &&
 549                                     args->progress.extract.completed_bytes >= next_progress &&
 550                                     args->progress.extract.total_bytes != 0)
 551                                 {
 552                                         progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS,
 553                                                       &args->progress);
 554                                         next_progress += bytes_per_progress;
 555                                 }
 556                         }
 557                 }
 558         }
 559 out:
 560         return ret;
 561 }
 562
 563 static int extract_single_image(WIMStruct *w, int image,
 564                                 const char *target, int extract_flags,
 565                                 wimlib_progress_func_t progress_func)
 566 {
 567         int ret;
 568         struct list_head stream_list;
 569         struct hlist_head *inode_list;
 570
 571         struct apply_args args;
 572         const struct apply_operations *ops;
 573
 574         args.w                    = w;
 575         args.target               = target;
 576         args.extract_flags        = extract_flags;
 577         args.num_lutimes_warnings = 0;
 578         args.target               = target;
 579         args.stream_list          = &stream_list;
 580         args.progress_func        = progress_func;
 581
 582         if (progress_func) {
 583                 args.progress.extract.wimfile_name = w->filename;
 584                 args.progress.extract.image = image;
 585                 args.progress.extract.extract_flags = (extract_flags &
 586                                                        WIMLIB_EXTRACT_MASK_PUBLIC);
 587                 args.progress.extract.image_name = wimlib_get_image_name(w, image);
 588                 args.progress.extract.target = target;
 589         }
 590
 591 #ifdef WITH_NTFS_3G
 592         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 593                 args.vol = ntfs_mount(target, 0);
 594                 if (!args.vol) {
 595                         ERROR_WITH_ERRNO("Failed to mount NTFS volume `%s'", target);
 596                         return WIMLIB_ERR_NTFS_3G;
 597                 }
 598                 ops = &ntfs_apply_operations;
 599         } else
 600 #endif
 601                 ops = &normal_apply_operations;
 602
 603         ret = select_wim_image(w, image);
 604         if (ret != 0)
 605                 goto out;
 606
 607         inode_list = &w->image_metadata[image - 1].inode_list;
 608
 609         find_streams_for_extraction(inode_list, &stream_list,
 610                                     w->lookup_table, extract_flags);
 611
 612         calculate_bytes_to_extract(&stream_list, extract_flags,
 613                                    &args.progress);
 614
 615         if (progress_func) {
 616                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN,
 617                               &args.progress);
 618         }
 619
 620         if (extract_flags & WIMLIB_EXTRACT_FLAG_SEQUENTIAL) {
 621                 ret = sort_stream_list_by_wim_position(&stream_list);
 622                 if (ret != 0) {
 623                         WARNING("Falling back to non-sequential extraction");
 624                         extract_flags &= ~WIMLIB_EXTRACT_FLAG_SEQUENTIAL;
 625                 }
 626         }
 627
 628         if (progress_func) {
 629                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_BEGIN,
 630                               &args.progress);
 631         }
 632
 633         args.extract_flags |= WIMLIB_EXTRACT_FLAG_NO_STREAMS;
 634         ret = for_dentry_in_tree(wim_root_dentry(w), ops->apply_dentry, &args);
 635         args.extract_flags &= ~WIMLIB_EXTRACT_FLAG_NO_STREAMS;
 636         if (ret != 0)
 637                 goto out;
 638
 639         if (progress_func) {
 640                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_END,
 641                               &args.progress);
 642         }
 643
 644         ret = apply_stream_list(&stream_list, &args, ops, progress_func);
 645         if (ret != 0)
 646                 goto out;
 647
 648         if (progress_func)
 649                 progress_func(WIMLIB_PROGRESS_MSG_APPLY_TIMESTAMPS, NULL);
 650
 651         ret = for_dentry_in_tree_depth(wim_root_dentry(w),
 652                                        ops->apply_dentry_timestamps, &args);
 653         if (ret != 0)
 654                 goto out;
 655
 656         if (progress_func) {
 657                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_END,
 658                               &args.progress);
 659         }
 660 out:
 661 #ifdef WITH_NTFS_3G
 662         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 663                 if (ntfs_umount(args.vol, FALSE) != 0) {
 664                         ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%s'", args.target);
 665                         if (ret == 0)
 666                                 ret = WIMLIB_ERR_NTFS_3G;
 667                 }
 668         }
 669 #endif
 670         return ret;
 671 }
 672
 673
 674 /* Extracts all images from the WIM to @output_dir, with the images placed in
 675  * subdirectories named by their image names. */
 676 static int extract_all_images(WIMStruct *w, const char *target,
 677                               int extract_flags,
 678                               wimlib_progress_func_t progress_func)
 679 {
 680         size_t image_name_max_len = max(xml_get_max_image_name_len(w), 20);
 681         size_t output_path_len = strlen(target);
 682         char buf[output_path_len + 1 + image_name_max_len + 1];
 683         int ret;
 684         int image;
 685         const char *image_name;
 686
 687         ret = extract_directory(target, true);
 688         if (ret != 0)
 689                 return ret;
 690
 691         memcpy(buf, target, output_path_len);
 692         buf[output_path_len] = '/';
 693         for (image = 1; image <= w->hdr.image_count; image++) {
 694                 image_name = wimlib_get_image_name(w, image);
 695                 if (image_name && *image_name) {
 696                         strcpy(buf + output_path_len + 1, image_name);
 697                 } else {
 698                         /* Image name is empty. Use image number instead */
 699                         sprintf(buf + output_path_len + 1, "%d", image);
 700                 }
 701                 ret = extract_single_image(w, image, buf, extract_flags,
 702                                            progress_func);
 703                 if (ret != 0)
 704                         return ret;
 705         }
 706         return 0;
 707 }
 708
 709 /* Extracts a single image or all images from a WIM file. */
 710 WIMLIBAPI int wimlib_extract_image(WIMStruct *w, int image,
 711                                    const char *target,
 712                                    int extract_flags,
 713                                    WIMStruct **additional_swms,
 714                                    unsigned num_additional_swms,
 715                                    wimlib_progress_func_t progress_func)
 716 {
 717         struct lookup_table *joined_tab, *w_tab_save;
 718         int ret;
 719
 720         if (!target)
 721                 return WIMLIB_ERR_INVALID_PARAM;
 722
 723         extract_flags &= WIMLIB_EXTRACT_MASK_PUBLIC;
 724
 725         if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
 726                         == (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
 727                 return WIMLIB_ERR_INVALID_PARAM;
 728
 729         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 730 #ifdef WITH_NTFS_3G
 731                 if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))) {
 732                         ERROR("Cannot specify symlink or hardlink flags when applying\n"
 733                               "        directly to a NTFS volume");
 734                         return WIMLIB_ERR_INVALID_PARAM;
 735                 }
 736                 if (image == WIMLIB_ALL_IMAGES) {
 737                         ERROR("Can only apply a single image when applying "
 738                               "directly to a NTFS volume");
 739                         return WIMLIB_ERR_INVALID_PARAM;
 740                 }
 741 #else
 742                 ERROR("wimlib was compiled without support for NTFS-3g, so");
 743                 ERROR("we cannot apply a WIM image directly to a NTFS volume");
 744                 return WIMLIB_ERR_UNSUPPORTED;
 745 #endif
 746         }
 747
 748         ret = verify_swm_set(w, additional_swms, num_additional_swms);
 749         if (ret != 0)
 750                 return ret;
 751
 752         if (num_additional_swms) {
 753                 ret = new_joined_lookup_table(w, additional_swms,
 754                                               num_additional_swms, &joined_tab);
 755                 if (ret != 0)
 756                         return ret;
 757                 w_tab_save = w->lookup_table;
 758                 w->lookup_table = joined_tab;
 759         }
 760
 761         if (image == WIMLIB_ALL_IMAGES) {
 762                 extract_flags |= WIMLIB_EXTRACT_FLAG_MULTI_IMAGE;
 763                 ret = extract_all_images(w, target, extract_flags,
 764                                          progress_func);
 765         } else {
 766                 extract_flags &= ~WIMLIB_EXTRACT_FLAG_MULTI_IMAGE;
 767                 ret = extract_single_image(w, image, target, extract_flags,
 768                                            progress_func);
 769         }
 770
 771         if (extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 772                              WIMLIB_EXTRACT_FLAG_HARDLINK))
 773         {
 774                 for_lookup_table_entry(w->lookup_table,
 775                                        lte_free_extracted_file,
 776                                        NULL);
 777         }
 778
 779         if (num_additional_swms) {
 780                 free_lookup_table(w->lookup_table);
 781                 w->lookup_table = w_tab_save;
 782         }
 783         return ret;
 784 }