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   1 /*
   2  * extract.c
   3  *
   4  * Support for extracting WIM images, or files or directories contained in a WIM
   5  * image.
   6  */
   7
   8 /*
   9  * Copyright (C) 2012, 2013 Eric Biggers
  10  *
  11  * This file is part of wimlib, a library for working with WIM files.
  12  *
  13  * wimlib is free software; you can redistribute it and/or modify it under the
  14  * terms of the GNU General Public License as published by the Free
  15  * Software Foundation; either version 3 of the License, or (at your option)
  16  * any later version.
  17  *
  18  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  19  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  20  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  21  * details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  25  */
  26
  27 #ifdef HAVE_CONFIG_H
  28 #  include "config.h"
  29 #endif
  30
  31 #ifdef __WIN32__
  32 #  include "wimlib/win32_common.h" /* For GetFullPathName() */
  33 #endif
  34
  35 #include "wimlib/apply.h"
  36 #include "wimlib/dentry.h"
  37 #include "wimlib/encoding.h"
  38 #include "wimlib/endianness.h"
  39 #include "wimlib/error.h"
  40 #include "wimlib/lookup_table.h"
  41 #include "wimlib/paths.h"
  42 #include "wimlib/resource.h"
  43 #include "wimlib/swm.h"
  44 #ifdef __WIN32__
  45 #  include "wimlib/win32.h" /* for realpath() equivalent */
  46 #endif
  47 #include "wimlib/xml.h"
  48
  49 #include <errno.h>
  50 #include <limits.h>
  51 #ifdef WITH_NTFS_3G
  52 #  include <ntfs-3g/volume.h> /* for ntfs_mount(), ntfs_umount() */
  53 #endif
  54 #include <stdlib.h>
  55 #include <sys/stat.h>
  56 #include <unistd.h>
  57
  58 #define MAX_LONG_PATH_WARNINGS 5
  59
  60 static int
  61 do_apply_op(struct wim_dentry *dentry, struct apply_args *args,
  62             int (*apply_dentry_func)(const tchar *, size_t,
  63                                      struct wim_dentry *, struct apply_args *))
  64 {
  65         tchar *p;
  66         size_t extraction_path_nchars;
  67         struct wim_dentry *d;
  68         LIST_HEAD(ancestor_list);
  69         const tchar *target;
  70         size_t target_nchars;
  71
  72 #ifdef __WIN32__
  73         if (args->target_lowlevel_path) {
  74                 target = args->target_lowlevel_path;
  75                 target_nchars = args->target_lowlevel_path_nchars;
  76         } else
  77 #endif
  78         {
  79                 target = args->target;
  80                 target_nchars = args->target_nchars;
  81         }
  82
  83         extraction_path_nchars = target_nchars;
  84
  85         for (d = dentry; d != args->extract_root; d = d->parent) {
  86                 if (d->not_extracted)
  87                         return 0;
  88                 extraction_path_nchars += d->extraction_name_nchars + 1;
  89                 list_add(&d->tmp_list, &ancestor_list);
  90         }
  91
  92         tchar extraction_path[extraction_path_nchars + 1];
  93         p = tmempcpy(extraction_path, target, target_nchars);
  94
  95
  96         list_for_each_entry(d, &ancestor_list, tmp_list) {
  97                 *p++ = OS_PREFERRED_PATH_SEPARATOR;
  98                 p = tmempcpy(p, d->extraction_name, d->extraction_name_nchars);
  99         }
 100         *p = T('\0');
 101
 102 #ifdef __WIN32__
 103         /* Warn the user if the path exceeds MAX_PATH */
 104
 105         /* + 1 for '\0', -4 for \\?\.  */
 106         if (extraction_path_nchars + 1 - 4 > MAX_PATH) {
 107                 if (dentry->needs_extraction &&
 108                     args->num_long_paths < MAX_LONG_PATH_WARNINGS)
 109                 {
 110                         WARNING("Path \"%ls\" exceeds MAX_PATH and will not be accessible "
 111                                 "to most Windows software", extraction_path);
 112                         if (++args->num_long_paths == MAX_LONG_PATH_WARNINGS)
 113                                 WARNING("Suppressing further warnings about long paths");
 114                 }
 115         }
 116 #endif
 117         return (*apply_dentry_func)(extraction_path, extraction_path_nchars,
 118                                     dentry, args);
 119 }
 120
 121
 122 /* Extracts a file, directory, or symbolic link from the WIM archive. */
 123 static int
 124 apply_dentry_normal(struct wim_dentry *dentry, void *arg)
 125 {
 126 #ifdef __WIN32__
 127         return do_apply_op(dentry, arg, win32_do_apply_dentry);
 128 #else
 129         return do_apply_op(dentry, arg, unix_do_apply_dentry);
 130 #endif
 131 }
 132
 133
 134 /* Apply timestamps to an extracted file or directory */
 135 static int
 136 apply_dentry_timestamps_normal(struct wim_dentry *dentry, void *arg)
 137 {
 138 #ifdef __WIN32__
 139         return do_apply_op(dentry, arg, win32_do_apply_dentry_timestamps);
 140 #else
 141         return do_apply_op(dentry, arg, unix_do_apply_dentry_timestamps);
 142 #endif
 143 }
 144
 145 static bool
 146 dentry_is_dot_or_dotdot(const struct wim_dentry *dentry)
 147 {
 148         const utf16lechar *file_name = dentry->file_name;
 149         return file_name != NULL &&
 150                 file_name[0] == cpu_to_le16('.') &&
 151                 (file_name[1] == cpu_to_le16('\0') ||
 152                  (file_name[1] == cpu_to_le16('.') &&
 153                   file_name[2] == cpu_to_le16('\0')));
 154 }
 155
 156 /* Extract a dentry if it hasn't already been extracted and either
 157  * WIMLIB_EXTRACT_FLAG_NO_STREAMS is not specified, or the dentry is a directory
 158  * and/or has no unnamed stream. */
 159 static int
 160 maybe_apply_dentry(struct wim_dentry *dentry, void *arg)
 161 {
 162         struct apply_args *args = arg;
 163         int ret;
 164
 165         if (!dentry->needs_extraction)
 166                 return 0;
 167
 168         if (args->extract_flags & WIMLIB_EXTRACT_FLAG_NO_STREAMS &&
 169             !dentry_is_directory(dentry) &&
 170             inode_unnamed_lte_resolved(dentry->d_inode) != NULL)
 171                 return 0;
 172
 173         if ((args->extract_flags & WIMLIB_EXTRACT_FLAG_VERBOSE) &&
 174              args->progress_func) {
 175                 ret = calculate_dentry_full_path(dentry);
 176                 if (ret)
 177                         return ret;
 178                 args->progress.extract.cur_path = dentry->_full_path;
 179                 args->progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DENTRY,
 180                                     &args->progress);
 181         }
 182         ret = args->apply_dentry(dentry, args);
 183         if (ret == 0)
 184                 dentry->needs_extraction = 0;
 185         return ret;
 186 }
 187
 188 static void
 189 calculate_bytes_to_extract(struct list_head *stream_list,
 190                            int extract_flags,
 191                            union wimlib_progress_info *progress)
 192 {
 193         struct wim_lookup_table_entry *lte;
 194         u64 total_bytes = 0;
 195         u64 num_streams = 0;
 196
 197         /* For each stream to be extracted... */
 198         list_for_each_entry(lte, stream_list, extraction_list) {
 199                 if (extract_flags &
 200                     (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
 201                 {
 202                         /* In the symlink or hard link extraction mode, each
 203                          * stream will be extracted one time regardless of how
 204                          * many dentries share the stream. */
 205                         wimlib_assert(!(extract_flags & WIMLIB_EXTRACT_FLAG_NTFS));
 206                         if (!lte->extracted_file) {
 207                                 num_streams++;
 208                                 total_bytes += wim_resource_size(lte);
 209                         }
 210                 } else {
 211                         num_streams += lte->out_refcnt;
 212                         total_bytes += lte->out_refcnt * wim_resource_size(lte);
 213                 }
 214         }
 215         progress->extract.num_streams = num_streams;
 216         progress->extract.total_bytes = total_bytes;
 217         progress->extract.completed_bytes = 0;
 218 }
 219
 220 static void
 221 maybe_add_stream_for_extraction(struct wim_lookup_table_entry *lte,
 222                                 struct list_head *stream_list)
 223 {
 224         if (++lte->out_refcnt == 1) {
 225                 INIT_LIST_HEAD(&lte->lte_dentry_list);
 226                 list_add_tail(&lte->extraction_list, stream_list);
 227         }
 228 }
 229
 230 struct find_streams_ctx {
 231         struct list_head stream_list;
 232         int extract_flags;
 233 };
 234
 235 static int
 236 dentry_find_streams_to_extract(struct wim_dentry *dentry, void *_ctx)
 237 {
 238         struct find_streams_ctx *ctx = _ctx;
 239         struct wim_inode *inode = dentry->d_inode;
 240         struct wim_lookup_table_entry *lte;
 241         bool dentry_added = false;
 242         struct list_head *stream_list = &ctx->stream_list;
 243         int extract_flags = ctx->extract_flags;
 244
 245         if (!dentry->needs_extraction)
 246                 return 0;
 247
 248         lte = inode_unnamed_lte_resolved(inode);
 249         if (lte) {
 250                 if (!inode->i_visited)
 251                         maybe_add_stream_for_extraction(lte, stream_list);
 252                 list_add_tail(&dentry->extraction_stream_list, &lte->lte_dentry_list);
 253                 dentry_added = true;
 254         }
 255
 256         /* Determine whether to include alternate data stream entries or not.
 257          *
 258          * UNIX:  Include them if extracting using NTFS-3g.
 259          *
 260          * Windows: Include them undconditionally, although if the filesystem is
 261          * not NTFS we won't actually be able to extract them. */
 262 #if defined(WITH_NTFS_3G)
 263         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS)
 264 #elif defined(__WIN32__)
 265         if (1)
 266 #else
 267         if (0)
 268 #endif
 269         {
 270                 for (unsigned i = 0; i < inode->i_num_ads; i++) {
 271                         if (inode->i_ads_entries[i].stream_name_nbytes != 0) {
 272                                 lte = inode->i_ads_entries[i].lte;
 273                                 if (lte) {
 274                                         if (!inode->i_visited) {
 275                                                 maybe_add_stream_for_extraction(lte,
 276                                                                                 stream_list);
 277                                         }
 278                                         if (!dentry_added) {
 279                                                 list_add_tail(&dentry->extraction_stream_list,
 280                                                               &lte->lte_dentry_list);
 281                                                 dentry_added = true;
 282                                         }
 283                                 }
 284                         }
 285                 }
 286         }
 287         inode->i_visited = 1;
 288         return 0;
 289 }
 290
 291 static int
 292 dentry_resolve_and_zero_lte_refcnt(struct wim_dentry *dentry, void *_lookup_table)
 293 {
 294         struct wim_inode *inode = dentry->d_inode;
 295         struct wim_lookup_table *lookup_table = _lookup_table;
 296         struct wim_lookup_table_entry *lte;
 297
 298         inode_resolve_ltes(inode, lookup_table);
 299         for (unsigned i = 0; i <= inode->i_num_ads; i++) {
 300                 lte = inode_stream_lte_resolved(inode, i);
 301                 if (lte)
 302                         lte->out_refcnt = 0;
 303         }
 304         return 0;
 305 }
 306
 307 static void
 308 find_streams_for_extraction(struct wim_dentry *root,
 309                             struct list_head *stream_list,
 310                             struct wim_lookup_table *lookup_table,
 311                             int extract_flags)
 312 {
 313         struct find_streams_ctx ctx;
 314
 315         INIT_LIST_HEAD(&ctx.stream_list);
 316         ctx.extract_flags = extract_flags;
 317         for_dentry_in_tree(root, dentry_resolve_and_zero_lte_refcnt, lookup_table);
 318         for_dentry_in_tree(root, dentry_find_streams_to_extract, &ctx);
 319         list_transfer(&ctx.stream_list, stream_list);
 320 }
 321
 322 struct apply_operations {
 323         int (*apply_dentry)(struct wim_dentry *dentry, void *arg);
 324         int (*apply_dentry_timestamps)(struct wim_dentry *dentry, void *arg);
 325 };
 326
 327 static const struct apply_operations normal_apply_operations = {
 328         .apply_dentry = apply_dentry_normal,
 329         .apply_dentry_timestamps = apply_dentry_timestamps_normal,
 330 };
 331
 332 #ifdef WITH_NTFS_3G
 333 static const struct apply_operations ntfs_apply_operations = {
 334         .apply_dentry = apply_dentry_ntfs,
 335         .apply_dentry_timestamps = apply_dentry_timestamps_ntfs,
 336 };
 337 #endif
 338
 339 static int
 340 apply_stream_list(struct list_head *stream_list,
 341                   struct apply_args *args,
 342                   const struct apply_operations *ops,
 343                   wimlib_progress_func_t progress_func)
 344 {
 345         uint64_t bytes_per_progress = args->progress.extract.total_bytes / 100;
 346         uint64_t next_progress = bytes_per_progress;
 347         struct wim_lookup_table_entry *lte;
 348         struct wim_dentry *dentry;
 349         int ret;
 350
 351         /* This complicated loop is essentially looping through the dentries,
 352          * although dentries may be visited more than once (if a dentry contains
 353          * two different nonempty streams) or not at all (if a dentry contains
 354          * no non-empty streams).
 355          *
 356          * The outer loop is over the distinct streams to be extracted so that
 357          * sequential reading of the WIM can be implemented. */
 358
 359         /* For each distinct stream to be extracted */
 360         list_for_each_entry(lte, stream_list, extraction_list) {
 361                 /* For each dentry to be extracted that is a name for an inode
 362                  * containing the stream */
 363                 list_for_each_entry(dentry, &lte->lte_dentry_list, extraction_stream_list) {
 364                         /* Extract the dentry if it was not already
 365                          * extracted */
 366                         ret = maybe_apply_dentry(dentry, args);
 367                         if (ret)
 368                                 return ret;
 369                         if (progress_func &&
 370                             args->progress.extract.completed_bytes >= next_progress)
 371                         {
 372                                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS,
 373                                               &args->progress);
 374                                 if (args->progress.extract.completed_bytes >=
 375                                     args->progress.extract.total_bytes)
 376                                 {
 377                                         next_progress = ~0ULL;
 378                                 } else {
 379                                         next_progress =
 380                                                 min (args->progress.extract.completed_bytes +
 381                                                      bytes_per_progress,
 382                                                      args->progress.extract.total_bytes);
 383                                 }
 384                         }
 385                 }
 386         }
 387         return 0;
 388 }
 389
 390 static int
 391 sort_stream_list_by_wim_position(struct list_head *stream_list)
 392 {
 393         struct list_head *cur;
 394         size_t num_streams;
 395         struct wim_lookup_table_entry **array;
 396         size_t i;
 397         size_t array_size;
 398
 399         num_streams = 0;
 400         list_for_each(cur, stream_list)
 401                 num_streams++;
 402         array_size = num_streams * sizeof(array[0]);
 403         array = MALLOC(array_size);
 404         if (!array) {
 405                 ERROR("Failed to allocate %zu bytes to sort stream entries",
 406                       array_size);
 407                 return WIMLIB_ERR_NOMEM;
 408         }
 409         cur = stream_list->next;
 410         for (i = 0; i < num_streams; i++) {
 411                 array[i] = container_of(cur, struct wim_lookup_table_entry, extraction_list);
 412                 cur = cur->next;
 413         }
 414
 415         qsort(array, num_streams, sizeof(array[0]), cmp_streams_by_wim_position);
 416
 417         INIT_LIST_HEAD(stream_list);
 418         for (i = 0; i < num_streams; i++)
 419                 list_add_tail(&array[i]->extraction_list, stream_list);
 420         FREE(array);
 421         return 0;
 422 }
 423
 424 /*
 425  * Extract a dentry to standard output.
 426  *
 427  * This obviously doesn't make sense in all cases.  We return an error if the
 428  * dentry does not correspond to a regular file.  Otherwise we extract the
 429  * unnamed data stream only.
 430  */
 431 static int
 432 extract_dentry_to_stdout(struct wim_dentry *dentry)
 433 {
 434         int ret = 0;
 435         if (!dentry_is_regular_file(dentry)) {
 436                 ERROR("\"%"TS"\" is not a regular file and therefore cannot be "
 437                       "extracted to standard output", dentry->_full_path);
 438                 ret = WIMLIB_ERR_NOT_A_REGULAR_FILE;
 439         } else {
 440                 struct wim_lookup_table_entry *lte;
 441
 442                 lte = inode_unnamed_lte_resolved(dentry->d_inode);
 443                 if (lte) {
 444                         ret = extract_wim_resource_to_fd(lte, STDOUT_FILENO,
 445                                                          wim_resource_size(lte));
 446                 }
 447         }
 448         return ret;
 449 }
 450
 451 #ifdef __WIN32__
 452 static const utf16lechar replacement_char = cpu_to_le16(0xfffd);
 453 #else
 454 static const utf16lechar replacement_char = cpu_to_le16('?');
 455 #endif
 456
 457 static bool
 458 file_name_valid(utf16lechar *name, size_t num_chars, bool fix)
 459 {
 460         size_t i;
 461
 462         if (num_chars == 0)
 463                 return true;
 464         for (i = 0; i < num_chars; i++) {
 465                 switch (name[i]) {
 466         #ifdef __WIN32__
 467                 case cpu_to_le16('\\'):
 468                 case cpu_to_le16(':'):
 469                 case cpu_to_le16('*'):
 470                 case cpu_to_le16('?'):
 471                 case cpu_to_le16('"'):
 472                 case cpu_to_le16('<'):
 473                 case cpu_to_le16('>'):
 474                 case cpu_to_le16('|'):
 475         #endif
 476                 case cpu_to_le16('/'):
 477                 case cpu_to_le16('\0'):
 478                         if (fix)
 479                                 name[i] = replacement_char;
 480                         else
 481                                 return false;
 482                 }
 483         }
 484
 485 #ifdef __WIN32__
 486         if (name[num_chars - 1] == cpu_to_le16(' ') ||
 487             name[num_chars - 1] == cpu_to_le16('.'))
 488         {
 489                 if (fix)
 490                         name[num_chars - 1] = replacement_char;
 491                 else
 492                         return false;
 493         }
 494 #endif
 495         return true;
 496 }
 497
 498 /*
 499  * dentry_calculate_extraction_path-
 500  *
 501  * Calculate the actual filename component at which a WIM dentry will be
 502  * extracted, handling invalid filenames "properly".
 503  *
 504  * dentry->extraction_name usually will be set the same as dentry->file_name (on
 505  * UNIX, converted into the platform's multibyte encoding).  However, if the
 506  * file name contains characters that are not valid on the current platform or
 507  * has some other format that is not valid, leave dentry->extraction_name as
 508  * NULL and clear dentry->needs_extraction to indicate that this dentry should
 509  * not be extracted, unless the appropriate flag
 510  * WIMLIB_EXTRACT_FLAG_REPLACE_INVALID_FILENAMES is set in the extract flags, in
 511  * which case a substitute filename will be created and set instead.
 512  *
 513  * Conflicts with case-insensitive names on Windows are handled similarly; see
 514  * below.
 515  */
 516 static int
 517 dentry_calculate_extraction_path(struct wim_dentry *dentry, void *_args)
 518 {
 519         struct apply_args *args = _args;
 520         int ret;
 521
 522         dentry->needs_extraction = 1;
 523
 524         if (dentry == args->extract_root)
 525                 return 0;
 526
 527         if (dentry_is_dot_or_dotdot(dentry)) {
 528                 /* WIM files shouldn't contain . or .. entries.  But if they are
 529                  * there, don't attempt to extract them. */
 530                 WARNING("Skipping extraction of unexpected . or .. file \"%"TS"\"",
 531                         dentry_full_path(dentry));
 532                 goto skip_dentry;
 533         }
 534
 535 #ifdef __WIN32__
 536         struct wim_dentry *other;
 537         list_for_each_entry(other, &dentry->case_insensitive_conflict_list,
 538                             case_insensitive_conflict_list)
 539         {
 540                 if (other->needs_extraction) {
 541                         if (args->extract_flags & WIMLIB_EXTRACT_FLAG_ALL_CASE_CONFLICTS)
 542                         {
 543                                 WARNING("\"%"TS"\" has the same case-insensitive "
 544                                         "name as \"%"TS"\"; extracting dummy name instead",
 545                                         dentry_full_path(dentry),
 546                                         dentry_full_path(other));
 547                                 goto out_replace;
 548                         } else {
 549                                 WARNING("Not extracting \"%"TS"\": has same case-insensitive "
 550                                         "name as \"%"TS"\"",
 551                                         dentry_full_path(dentry),
 552                                         dentry_full_path(other));
 553                                 goto skip_dentry;
 554                         }
 555                 }
 556         }
 557 #endif
 558
 559         if (file_name_valid(dentry->file_name, dentry->file_name_nbytes / 2, false)) {
 560 #ifdef __WIN32__
 561                 dentry->extraction_name = dentry->file_name;
 562                 dentry->extraction_name_nchars = dentry->file_name_nbytes / 2;
 563                 return 0;
 564 #else
 565                 return utf16le_to_tstr(dentry->file_name,
 566                                        dentry->file_name_nbytes,
 567                                        &dentry->extraction_name,
 568                                        &dentry->extraction_name_nchars);
 569 #endif
 570         } else {
 571                 if (args->extract_flags & WIMLIB_EXTRACT_FLAG_REPLACE_INVALID_FILENAMES)
 572                 {
 573                         WARNING("\"%"TS"\" has an invalid filename "
 574                                 "that is not supported on this platform; "
 575                                 "extracting dummy name instead",
 576                                 dentry_full_path(dentry));
 577                         goto out_replace;
 578                 } else {
 579                         WARNING("Not extracting \"%"TS"\": has an invalid filename "
 580                                 "that is not supported on this platform",
 581                                 dentry_full_path(dentry));
 582                         goto skip_dentry;
 583                 }
 584         }
 585
 586 out_replace:
 587         {
 588                 utf16lechar utf16_name_copy[dentry->file_name_nbytes / 2];
 589
 590                 memcpy(utf16_name_copy, dentry->file_name, dentry->file_name_nbytes);
 591                 file_name_valid(utf16_name_copy, dentry->file_name_nbytes / 2, true);
 592
 593                 tchar *tchar_name;
 594                 size_t tchar_nchars;
 595         #ifdef __WIN32__
 596                 tchar_name = utf16_name_copy;
 597                 tchar_nchars = dentry->file_name_nbytes / 2;
 598         #else
 599                 ret = utf16le_to_tstr(utf16_name_copy,
 600                                       dentry->file_name_nbytes,
 601                                       &tchar_name, &tchar_nchars);
 602                 if (ret)
 603                         return ret;
 604         #endif
 605                 size_t fixed_name_num_chars = tchar_nchars;
 606                 tchar fixed_name[tchar_nchars + 50];
 607
 608                 tmemcpy(fixed_name, tchar_name, tchar_nchars);
 609                 fixed_name_num_chars += tsprintf(fixed_name + tchar_nchars,
 610                                                  T(" (invalid filename #%lu)"),
 611                                                  ++args->invalid_sequence);
 612         #ifndef __WIN32__
 613                 FREE(tchar_name);
 614         #endif
 615                 dentry->extraction_name = memdup(fixed_name, 2 * fixed_name_num_chars + 2);
 616                 if (!dentry->extraction_name)
 617                         return WIMLIB_ERR_NOMEM;
 618                 dentry->extraction_name_nchars = fixed_name_num_chars;
 619         }
 620         return 0;
 621 skip_dentry:
 622         dentry->needs_extraction = 0;
 623         dentry->not_extracted = 1;
 624         return 0;
 625 }
 626
 627 static int
 628 dentry_reset_needs_extraction(struct wim_dentry *dentry, void *_ignore)
 629 {
 630         dentry->needs_extraction = 0;
 631         dentry->not_extracted = 0;
 632         dentry->is_win32_name = 0;
 633         dentry->d_inode->i_visited = 0;
 634         dentry->d_inode->i_dos_name_extracted = 0;
 635         FREE(dentry->d_inode->i_extracted_file);
 636         dentry->d_inode->i_extracted_file = NULL;
 637         if ((void*)dentry->extraction_name != (void*)dentry->file_name)
 638                 FREE(dentry->extraction_name);
 639         dentry->extraction_name = NULL;
 640         return 0;
 641 }
 642
 643 /*
 644  * extract_tree - Extract a file or directory tree from the currently selected
 645  *                WIM image.
 646  *
 647  * @wim:        WIMStruct for the WIM file, with the desired image selected
 648  *              (as wim->current_image).
 649  * @wim_source_path:
 650  *              "Canonical" (i.e. no leading or trailing slashes, path
 651  *              separators forwald slashes) path inside the WIM image to
 652  *              extract.  An empty string means the full image.
 653  * @target:
 654  *              Filesystem path to extract the file or directory tree to.
 655  *
 656  * @extract_flags:
 657  *              WIMLIB_EXTRACT_FLAG_*.  Also, the private flag
 658  *              WIMLIB_EXTRACT_FLAG_MULTI_IMAGE will be set if this is being
 659  *              called through wimlib_extract_image() with WIMLIB_ALL_IMAGES as
 660  *              the image.
 661  *
 662  * @progress_func:
 663  *              If non-NULL, progress function for the extraction.  The messages
 664  *              we may in this function are:
 665  *
 666  *              WIMLIB_PROGRESS_MSG_EXTRACT_TREE_BEGIN or
 667  *                      WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN;
 668  *              WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_BEGIN;
 669  *              WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_END;
 670  *              WIMLIB_PROGRESS_MSG_EXTRACT_DENTRY;
 671  *              WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS;
 672  *              WIMLIB_PROGRESS_MSG_APPLY_TIMESTAMPS;
 673  *              WIMLIB_PROGRESS_MSG_EXTRACT_TREE_END or
 674  *                      WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_END.
 675  *
 676  * Returns 0 on success; nonzero on failure.
 677  */
 678 static int
 679 extract_tree(WIMStruct *wim, const tchar *wim_source_path, const tchar *target,
 680              int extract_flags, wimlib_progress_func_t progress_func)
 681 {
 682         int ret;
 683         struct list_head stream_list;
 684         struct apply_args args;
 685         const struct apply_operations *ops;
 686         struct wim_dentry *root;
 687
 688         memset(&args, 0, sizeof(args));
 689
 690
 691         args.w                      = wim;
 692         args.target                 = target;
 693         args.target_nchars          = tstrlen(target);
 694         args.extract_flags          = extract_flags;
 695         args.progress_func          = progress_func;
 696
 697 #ifdef __WIN32__
 698         /* Work around defective behavior in Windows where paths longer than 260
 699          * characters are not supported by default; instead they need to be
 700          * turned into absolute paths and prefixed with "\\?\".  */
 701         args.target_lowlevel_path = MALLOC(32768 * sizeof(wchar_t));
 702         if (!args.target_lowlevel_path)
 703         {
 704                 ret = WIMLIB_ERR_NOMEM;
 705                 goto out;
 706         }
 707         args.target_lowlevel_path[0] = L'\\';
 708         args.target_lowlevel_path[1] = L'\\';
 709         args.target_lowlevel_path[2] = L'?';
 710         args.target_lowlevel_path[3] = L'\\';
 711         args.target_lowlevel_path_nchars =
 712                 GetFullPathName(args.target, 32768 - 4,
 713                                 &args.target_lowlevel_path[4], NULL);
 714
 715         if (args.target_lowlevel_path_nchars == 0 ||
 716             args.target_lowlevel_path_nchars >= 32768 - 4)
 717         {
 718                 WARNING("Can't get full path name for \"%ls\"", args.target);
 719                 FREE(args.target_lowlevel_path);
 720                 args.target_lowlevel_path = NULL;
 721         } else {
 722                 args.target_lowlevel_path_nchars += 4;
 723         }
 724 #endif
 725
 726         if (progress_func) {
 727                 args.progress.extract.wimfile_name = wim->filename;
 728                 args.progress.extract.image = wim->current_image;
 729                 args.progress.extract.extract_flags = (extract_flags &
 730                                                        WIMLIB_EXTRACT_MASK_PUBLIC);
 731                 args.progress.extract.image_name = wimlib_get_image_name(wim,
 732                                                                          wim->current_image);
 733                 args.progress.extract.extract_root_wim_source_path = wim_source_path;
 734                 args.progress.extract.target = target;
 735         }
 736
 737 #ifdef WITH_NTFS_3G
 738         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 739                 args.vol = ntfs_mount(target, 0);
 740                 if (!args.vol) {
 741                         ERROR_WITH_ERRNO("Failed to mount NTFS volume `%"TS"'",
 742                                          target);
 743                         ret = WIMLIB_ERR_NTFS_3G;
 744                         goto out_free_target_lowlevel_path;
 745                 }
 746                 ops = &ntfs_apply_operations;
 747         } else
 748 #endif
 749                 ops = &normal_apply_operations;
 750
 751         root = get_dentry(wim, wim_source_path);
 752         if (!root) {
 753                 ERROR("Path \"%"TS"\" does not exist in WIM image %d",
 754                       wim_source_path, wim->current_image);
 755                 ret = WIMLIB_ERR_PATH_DOES_NOT_EXIST;
 756                 goto out_ntfs_umount;
 757         }
 758         args.extract_root = root;
 759
 760         /* Calculate the actual filename component of each extracted dentry, and
 761          * in the process set the dentry->needs_extraction flag on dentries that
 762          * will be extracted. */
 763         ret = for_dentry_in_tree(root, dentry_calculate_extraction_path, &args);
 764         if (ret)
 765                 goto out_dentry_reset_needs_extraction;
 766
 767         /* Build a list of the streams that need to be extracted */
 768         find_streams_for_extraction(root,
 769                                     &stream_list,
 770                                     wim->lookup_table, extract_flags);
 771
 772         /* Calculate the number of bytes of data that will be extracted */
 773         calculate_bytes_to_extract(&stream_list, extract_flags,
 774                                    &args.progress);
 775
 776         if (extract_flags & WIMLIB_EXTRACT_FLAG_TO_STDOUT) {
 777                 ret = extract_dentry_to_stdout(root);
 778                 goto out_dentry_reset_needs_extraction;
 779         }
 780
 781         if (progress_func) {
 782                 progress_func(*wim_source_path ? WIMLIB_PROGRESS_MSG_EXTRACT_TREE_BEGIN :
 783                               WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN,
 784                               &args.progress);
 785         }
 786
 787         /* If a sequential extraction was specified, sort the streams to be
 788          * extracted by their position in the WIM file, so that the WIM file can
 789          * be read sequentially. */
 790         if (extract_flags & WIMLIB_EXTRACT_FLAG_SEQUENTIAL) {
 791                 ret = sort_stream_list_by_wim_position(&stream_list);
 792                 if (ret != 0) {
 793                         WARNING("Falling back to non-sequential extraction");
 794                         extract_flags &= ~WIMLIB_EXTRACT_FLAG_SEQUENTIAL;
 795                 }
 796         }
 797
 798         if (progress_func) {
 799                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_BEGIN,
 800                               &args.progress);
 801         }
 802
 803         /* Make the directory structure and extract empty files */
 804         args.extract_flags |= WIMLIB_EXTRACT_FLAG_NO_STREAMS;
 805         args.apply_dentry = ops->apply_dentry;
 806         ret = for_dentry_in_tree(root, maybe_apply_dentry, &args);
 807         args.extract_flags &= ~WIMLIB_EXTRACT_FLAG_NO_STREAMS;
 808         if (ret)
 809                 goto out_dentry_reset_needs_extraction;
 810
 811         if (progress_func) {
 812                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_END,
 813                               &args.progress);
 814         }
 815
 816         if (extract_flags & WIMLIB_EXTRACT_FLAG_RPFIX) {
 817                 args.target_realpath = realpath(target, NULL);
 818                 if (!args.target_realpath) {
 819                         ret = WIMLIB_ERR_NOMEM;
 820                         goto out_dentry_reset_needs_extraction;
 821                 }
 822                 args.target_realpath_len = tstrlen(args.target_realpath);
 823         }
 824
 825         /* Extract non-empty files */
 826         ret = apply_stream_list(&stream_list, &args, ops, progress_func);
 827         if (ret)
 828                 goto out_free_target_realpath;
 829
 830         if (progress_func) {
 831                 progress_func(WIMLIB_PROGRESS_MSG_APPLY_TIMESTAMPS,
 832                               &args.progress);
 833         }
 834
 835         /* Apply timestamps */
 836         ret = for_dentry_in_tree_depth(root,
 837                                        ops->apply_dentry_timestamps, &args);
 838         if (ret)
 839                 goto out_free_target_realpath;
 840
 841         if (progress_func) {
 842                 progress_func(*wim_source_path ? WIMLIB_PROGRESS_MSG_EXTRACT_TREE_END :
 843                               WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_END,
 844                               &args.progress);
 845         }
 846 out_free_target_realpath:
 847         FREE(args.target_realpath);
 848 out_dentry_reset_needs_extraction:
 849         for_dentry_in_tree(root, dentry_reset_needs_extraction, NULL);
 850 out_ntfs_umount:
 851 #ifdef WITH_NTFS_3G
 852         /* Unmount the NTFS volume */
 853         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 854                 if (ntfs_umount(args.vol, FALSE) != 0) {
 855                         ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%"TS"'",
 856                                          args.target);
 857                         if (ret == 0)
 858                                 ret = WIMLIB_ERR_NTFS_3G;
 859                 }
 860         }
 861 #endif
 862 out_free_target_lowlevel_path:
 863 #ifdef __WIN32__
 864         FREE(args.target_lowlevel_path);
 865 #endif
 866 out:
 867         return ret;
 868 }
 869
 870 /* Validates a single wimlib_extract_command, mostly checking to make sure the
 871  * extract flags make sense. */
 872 static int
 873 check_extract_command(struct wimlib_extract_command *cmd, int wim_header_flags)
 874 {
 875         int extract_flags;
 876         bool is_entire_image = (cmd->wim_source_path[0] == T('\0'));
 877
 878         /* Empty destination path? */
 879         if (cmd->fs_dest_path[0] == T('\0'))
 880                 return WIMLIB_ERR_INVALID_PARAM;
 881
 882         extract_flags = cmd->extract_flags;
 883
 884         /* Specified both symlink and hardlink modes? */
 885         if ((extract_flags &
 886              (WIMLIB_EXTRACT_FLAG_SYMLINK |
 887               WIMLIB_EXTRACT_FLAG_HARDLINK)) == (WIMLIB_EXTRACT_FLAG_SYMLINK |
 888                                                  WIMLIB_EXTRACT_FLAG_HARDLINK))
 889                 return WIMLIB_ERR_INVALID_PARAM;
 890
 891 #ifdef __WIN32__
 892         /* Wanted UNIX data on Windows? */
 893         if (extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) {
 894                 ERROR("Extracting UNIX data is not supported on Windows");
 895                 return WIMLIB_ERR_INVALID_PARAM;
 896         }
 897         /* Wanted linked extraction on Windows?  (XXX This is possible, just not
 898          * implemented yet.) */
 899         if (extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 900                              WIMLIB_EXTRACT_FLAG_HARDLINK))
 901         {
 902                 ERROR("Linked extraction modes are not supported on Windows");
 903                 return WIMLIB_ERR_INVALID_PARAM;
 904         }
 905 #endif
 906
 907         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 908                 /* NTFS-3g extraction mode requested */
 909 #ifdef WITH_NTFS_3G
 910                 if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 911                                       WIMLIB_EXTRACT_FLAG_HARDLINK))) {
 912                         ERROR("Cannot specify symlink or hardlink flags when applying\n"
 913                               "        directly to a NTFS volume");
 914                         return WIMLIB_ERR_INVALID_PARAM;
 915                 }
 916                 if (!is_entire_image &&
 917                     (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS))
 918                 {
 919                         ERROR("When applying directly to a NTFS volume you can "
 920                               "only extract a full image, not part of one");
 921                         return WIMLIB_ERR_INVALID_PARAM;
 922                 }
 923                 if (extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) {
 924                         ERROR("Cannot restore UNIX-specific data in "
 925                               "the NTFS extraction mode");
 926                         return WIMLIB_ERR_INVALID_PARAM;
 927                 }
 928 #else
 929                 ERROR("wimlib was compiled without support for NTFS-3g, so");
 930                 ERROR("we cannot apply a WIM image directly to a NTFS volume");
 931                 return WIMLIB_ERR_UNSUPPORTED;
 932 #endif
 933         }
 934
 935         if ((extract_flags & (WIMLIB_EXTRACT_FLAG_RPFIX |
 936                               WIMLIB_EXTRACT_FLAG_NORPFIX)) ==
 937                 (WIMLIB_EXTRACT_FLAG_RPFIX | WIMLIB_EXTRACT_FLAG_NORPFIX))
 938         {
 939                 ERROR("Cannot specify RPFIX and NORPFIX flags at the same time!");
 940                 return WIMLIB_ERR_INVALID_PARAM;
 941         }
 942
 943         if ((extract_flags & (WIMLIB_EXTRACT_FLAG_RPFIX |
 944                               WIMLIB_EXTRACT_FLAG_NORPFIX)) == 0)
 945         {
 946                 /* Do reparse point fixups by default if the WIM header says
 947                  * they are enabled and we are extracting a full image. */
 948                 if ((wim_header_flags & WIM_HDR_FLAG_RP_FIX) && is_entire_image)
 949                         extract_flags |= WIMLIB_EXTRACT_FLAG_RPFIX;
 950         }
 951
 952         if (!is_entire_image && (extract_flags & WIMLIB_EXTRACT_FLAG_RPFIX)) {
 953                 ERROR("Cannot specify --rpfix when not extracting entire image");
 954                 return WIMLIB_ERR_INVALID_PARAM;
 955         }
 956
 957         cmd->extract_flags = extract_flags;
 958         return 0;
 959 }
 960
 961
 962 /* Internal function to execute extraction commands for a WIM image. */
 963 static int
 964 do_wimlib_extract_files(WIMStruct *wim,
 965                         int image,
 966                         struct wimlib_extract_command *cmds,
 967                         size_t num_cmds,
 968                         wimlib_progress_func_t progress_func)
 969 {
 970         int ret;
 971         bool found_link_cmd = false;
 972         bool found_nolink_cmd = false;
 973
 974         /* Select the image from which we are extracting files */
 975         ret = select_wim_image(wim, image);
 976         if (ret)
 977                 return ret;
 978
 979         /* Make sure there are no streams in the WIM that have not been
 980          * checksummed yet. */
 981         ret = wim_checksum_unhashed_streams(wim);
 982         if (ret)
 983                 return ret;
 984
 985         /* Check for problems with the extraction commands */
 986         for (size_t i = 0; i < num_cmds; i++) {
 987                 ret = check_extract_command(&cmds[i], wim->hdr.flags);
 988                 if (ret)
 989                         return ret;
 990                 if (cmds[i].extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 991                                              WIMLIB_EXTRACT_FLAG_HARDLINK)) {
 992                         found_link_cmd = true;
 993                 } else {
 994                         found_nolink_cmd = true;
 995                 }
 996                 if (found_link_cmd && found_nolink_cmd) {
 997                         ERROR("Symlink or hardlink extraction mode must "
 998                               "be set on all extraction commands");
 999                         return WIMLIB_ERR_INVALID_PARAM;
1000                 }
1001         }
1002
1003         /* Execute the extraction commands */
1004         for (size_t i = 0; i < num_cmds; i++) {
1005                 ret = extract_tree(wim,
1006                                    cmds[i].wim_source_path,
1007                                    cmds[i].fs_dest_path,
1008                                    cmds[i].extract_flags,
1009                                    progress_func);
1010                 if (ret)
1011                         return ret;
1012         }
1013         return 0;
1014 }
1015
1016 /* Extract files or directories from a WIM image. */
1017 WIMLIBAPI int
1018 wimlib_extract_files(WIMStruct *wim,
1019                      int image,
1020                      const struct wimlib_extract_command *cmds,
1021                      size_t num_cmds,
1022                      int default_extract_flags,
1023                      WIMStruct **additional_swms,
1024                      unsigned num_additional_swms,
1025                      wimlib_progress_func_t progress_func)
1026 {
1027         int ret;
1028         struct wimlib_extract_command *cmds_copy;
1029         int all_flags = 0;
1030
1031         default_extract_flags &= WIMLIB_EXTRACT_MASK_PUBLIC;
1032
1033         ret = verify_swm_set(wim, additional_swms, num_additional_swms);
1034         if (ret)
1035                 goto out;
1036
1037         if (num_cmds == 0)
1038                 goto out;
1039
1040         if (num_additional_swms)
1041                 merge_lookup_tables(wim, additional_swms, num_additional_swms);
1042
1043         cmds_copy = CALLOC(num_cmds, sizeof(cmds[0]));
1044         if (!cmds_copy) {
1045                 ret = WIMLIB_ERR_NOMEM;
1046                 goto out_restore_lookup_table;
1047         }
1048
1049         for (size_t i = 0; i < num_cmds; i++) {
1050                 cmds_copy[i].extract_flags = (default_extract_flags |
1051                                                  cmds[i].extract_flags)
1052                                                 & WIMLIB_EXTRACT_MASK_PUBLIC;
1053                 all_flags |= cmds_copy[i].extract_flags;
1054
1055                 cmds_copy[i].wim_source_path = canonicalize_wim_path(cmds[i].wim_source_path);
1056                 if (!cmds_copy[i].wim_source_path) {
1057                         ret = WIMLIB_ERR_NOMEM;
1058                         goto out_free_cmds_copy;
1059                 }
1060
1061                 cmds_copy[i].fs_dest_path = canonicalize_fs_path(cmds[i].fs_dest_path);
1062                 if (!cmds_copy[i].fs_dest_path) {
1063                         ret = WIMLIB_ERR_NOMEM;
1064                         goto out_free_cmds_copy;
1065                 }
1066
1067         }
1068         ret = do_wimlib_extract_files(wim, image,
1069                                       cmds_copy, num_cmds,
1070                                       progress_func);
1071
1072         if (all_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
1073                          WIMLIB_EXTRACT_FLAG_HARDLINK))
1074         {
1075                 for_lookup_table_entry(wim->lookup_table,
1076                                        lte_free_extracted_file, NULL);
1077         }
1078 out_free_cmds_copy:
1079         for (size_t i = 0; i < num_cmds; i++) {
1080                 FREE(cmds_copy[i].wim_source_path);
1081                 FREE(cmds_copy[i].fs_dest_path);
1082         }
1083         FREE(cmds_copy);
1084 out_restore_lookup_table:
1085         if (num_additional_swms)
1086                 unmerge_lookup_table(wim);
1087 out:
1088         return ret;
1089 }
1090
1091 /*
1092  * Extracts an image from a WIM file.
1093  *
1094  * @wim:                WIMStruct for the WIM file.
1095  *
1096  * @image:              Number of the single image to extract.
1097  *
1098  * @target:             Directory or NTFS volume to extract the image to.
1099  *
1100  * @extract_flags:      Bitwise or of WIMLIB_EXTRACT_FLAG_*.
1101  *
1102  * @progress_func:      If non-NULL, a progress function to be called
1103  *                      periodically.
1104  *
1105  * Returns 0 on success; nonzero on failure.
1106  */
1107 static int
1108 extract_single_image(WIMStruct *wim, int image,
1109                      const tchar *target, int extract_flags,
1110                      wimlib_progress_func_t progress_func)
1111 {
1112         int ret;
1113         tchar *target_copy = canonicalize_fs_path(target);
1114         if (!target_copy)
1115                 return WIMLIB_ERR_NOMEM;
1116         struct wimlib_extract_command cmd = {
1117                 .wim_source_path = T(""),
1118                 .fs_dest_path = target_copy,
1119                 .extract_flags = extract_flags,
1120         };
1121         ret = do_wimlib_extract_files(wim, image, &cmd, 1, progress_func);
1122         FREE(target_copy);
1123         return ret;
1124 }
1125
1126 static const tchar * const filename_forbidden_chars =
1127 T(
1128 #ifdef __WIN32__
1129 "<>:\"/\\|?*"
1130 #else
1131 "/"
1132 #endif
1133 );
1134
1135 /* This function checks if it is okay to use a WIM image's name as a directory
1136  * name.  */
1137 static bool
1138 image_name_ok_as_dir(const tchar *image_name)
1139 {
1140         return image_name && *image_name &&
1141                 !tstrpbrk(image_name, filename_forbidden_chars) &&
1142                 tstrcmp(image_name, T(".")) &&
1143                 tstrcmp(image_name, T(".."));
1144 }
1145
1146 /* Extracts all images from the WIM to the directory @target, with the images
1147  * placed in subdirectories named by their image names. */
1148 static int
1149 extract_all_images(WIMStruct *wim,
1150                    const tchar *target,
1151                    int extract_flags,
1152                    wimlib_progress_func_t progress_func)
1153 {
1154         size_t image_name_max_len = max(xml_get_max_image_name_len(wim), 20);
1155         size_t output_path_len = tstrlen(target);
1156         tchar buf[output_path_len + 1 + image_name_max_len + 1];
1157         int ret;
1158         int image;
1159         const tchar *image_name;
1160         struct stat stbuf;
1161
1162         if (tstat(target, &stbuf)) {
1163                 if (errno == ENOENT)
1164                 {
1165                         if (tmkdir(target, S_IRWXU | S_IRGRP | S_IXGRP |
1166                                            S_IROTH | S_IXOTH))
1167                         {
1168                                 ERROR_WITH_ERRNO("Failed to create directory \"%"TS"\"", target);
1169                                 return WIMLIB_ERR_MKDIR;
1170                         }
1171                 } else {
1172                         ERROR_WITH_ERRNO("Failed to stat \"%"TS"\"", target);
1173                         return WIMLIB_ERR_STAT;
1174                 }
1175         } else if (!S_ISDIR(stbuf.st_mode)) {
1176                 ERROR("\"%"TS"\" is not a directory", target);
1177                 return WIMLIB_ERR_NOTDIR;
1178         }
1179
1180         tmemcpy(buf, target, output_path_len);
1181         buf[output_path_len] = T('/');
1182         for (image = 1; image <= wim->hdr.image_count; image++) {
1183                 image_name = wimlib_get_image_name(wim, image);
1184                 if (image_name_ok_as_dir(image_name)) {
1185                         tstrcpy(buf + output_path_len + 1, image_name);
1186                 } else {
1187                         /* Image name is empty or contains forbidden characters.
1188                          * Use image number instead. */
1189                         tsprintf(buf + output_path_len + 1, T("%d"), image);
1190                 }
1191                 ret = extract_single_image(wim, image, buf, extract_flags,
1192                                            progress_func);
1193                 if (ret)
1194                         return ret;
1195         }
1196         return 0;
1197 }
1198
1199 /* Extracts a single image or all images from a WIM file to a directory or NTFS
1200  * volume. */
1201 WIMLIBAPI int
1202 wimlib_extract_image(WIMStruct *wim,
1203                      int image,
1204                      const tchar *target,
1205                      int extract_flags,
1206                      WIMStruct **additional_swms,
1207                      unsigned num_additional_swms,
1208                      wimlib_progress_func_t progress_func)
1209 {
1210         int ret;
1211
1212         extract_flags &= WIMLIB_EXTRACT_MASK_PUBLIC;
1213
1214         ret = verify_swm_set(wim, additional_swms, num_additional_swms);
1215         if (ret)
1216                 return ret;
1217
1218         if (num_additional_swms)
1219                 merge_lookup_tables(wim, additional_swms, num_additional_swms);
1220
1221         if (image == WIMLIB_ALL_IMAGES) {
1222                 ret = extract_all_images(wim, target,
1223                                          extract_flags | WIMLIB_EXTRACT_FLAG_MULTI_IMAGE,
1224                                          progress_func);
1225         } else {
1226                 ret = extract_single_image(wim, image, target, extract_flags,
1227                                            progress_func);
1228         }
1229
1230         if (extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
1231                              WIMLIB_EXTRACT_FLAG_HARDLINK))
1232         {
1233                 for_lookup_table_entry(wim->lookup_table,
1234                                        lte_free_extracted_file,
1235                                        NULL);
1236         }
1237         if (num_additional_swms)
1238                 unmerge_lookup_table(wim);
1239         return ret;
1240 }