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   1 /*
   2  * extract_image.c
   3  *
   4  * Support for extracting WIM files.
   5  */
   6
   7 /*
   8  * Copyright (C) 2012, 2013 Eric Biggers
   9  *
  10  * This file is part of wimlib, a library for working with WIM files.
  11  *
  12  * wimlib is free software; you can redistribute it and/or modify it under the
  13  * terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 3 of the License, or (at your option)
  15  * any later version.
  16  *
  17  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  18  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  19  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <dirent.h>
  29
  30 #ifdef __WIN32__
  31 #  include "win32.h"
  32 #else
  33 #  ifdef HAVE_UTIME_H
  34 #    include <utime.h>
  35 #  endif
  36 #  include "timestamp.h"
  37 #  include <sys/time.h>
  38 #endif
  39
  40 #include <errno.h>
  41 #include <fcntl.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <sys/stat.h>
  45
  46 #include <unistd.h>
  47
  48 #include "dentry.h"
  49 #include "lookup_table.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 #ifdef HAVE_ALLOCA_H
  58 #  include <alloca.h>
  59 #endif
  60
  61 #ifndef __WIN32__
  62 static int extract_regular_file_linked(struct wim_dentry *dentry,
  63                                        const char *output_path,
  64                                        struct apply_args *args,
  65                                        struct wim_lookup_table_entry *lte)
  66 {
  67         /* This mode overrides the normal hard-link extraction and
  68          * instead either symlinks or hardlinks *all* identical files in
  69          * the WIM, even if they are in a different image (in the case
  70          * of a multi-image extraction) */
  71
  72         if (args->extract_flags & WIMLIB_EXTRACT_FLAG_HARDLINK) {
  73                 if (link(lte->extracted_file, output_path) != 0) {
  74                         ERROR_WITH_ERRNO("Failed to hard link "
  75                                          "`%s' to `%s'",
  76                                          output_path, lte->extracted_file);
  77                         return WIMLIB_ERR_LINK;
  78                 }
  79         } else {
  80                 int num_path_components;
  81                 int num_output_dir_path_components;
  82                 size_t extracted_file_len;
  83                 char *p;
  84                 const char *p2;
  85                 size_t i;
  86
  87                 num_path_components =
  88                         get_num_path_components(dentry->full_path_utf8) - 1;
  89                 num_output_dir_path_components =
  90                         get_num_path_components(args->target);
  91
  92                 if (args->extract_flags & WIMLIB_EXTRACT_FLAG_MULTI_IMAGE) {
  93                         num_path_components++;
  94                         num_output_dir_path_components--;
  95                 }
  96                 extracted_file_len = strlen(lte->extracted_file);
  97
  98                 char buf[extracted_file_len + 3 * num_path_components + 1];
  99                 p = &buf[0];
 100
 101                 for (i = 0; i < num_path_components; i++) {
 102                         *p++ = '.';
 103                         *p++ = '.';
 104                         *p++ = '/';
 105                 }
 106                 p2 = lte->extracted_file;
 107                 while (*p2 == '/')
 108                         p2++;
 109                 while (num_output_dir_path_components--)
 110                         p2 = path_next_part(p2, NULL);
 111                 strcpy(p, p2);
 112                 if (symlink(buf, output_path) != 0) {
 113                         ERROR_WITH_ERRNO("Failed to symlink `%s' to "
 114                                          "`%s'",
 115                                          buf, lte->extracted_file);
 116                         return WIMLIB_ERR_LINK;
 117                 }
 118         }
 119         return 0;
 120 }
 121
 122 static int symlink_apply_unix_data(const char *link,
 123                                    const struct wimlib_unix_data *unix_data)
 124 {
 125         if (lchown(link, unix_data->uid, unix_data->gid)) {
 126                 if (errno == EPERM) {
 127                         /* Ignore */
 128                         WARNING_WITH_ERRNO("failed to set symlink UNIX owner/group");
 129                 } else {
 130                         ERROR_WITH_ERRNO("failed to set symlink UNIX owner/group");
 131                         return WIMLIB_ERR_INVALID_DENTRY;
 132                 }
 133         }
 134         return 0;
 135 }
 136
 137 static int fd_apply_unix_data(int fd, const struct wimlib_unix_data *unix_data)
 138 {
 139         if (fchown(fd, unix_data->uid, unix_data->gid)) {
 140                 if (errno == EPERM) {
 141                         WARNING_WITH_ERRNO("failed to set file UNIX owner/group");
 142                         /* Ignore? */
 143                 } else {
 144                         ERROR_WITH_ERRNO("failed to set file UNIX owner/group");
 145                         return WIMLIB_ERR_INVALID_DENTRY;
 146                 }
 147         }
 148
 149         if (fchmod(fd, unix_data->mode)) {
 150                 if (errno == EPERM) {
 151                         WARNING_WITH_ERRNO("failed to set UNIX file mode");
 152                         /* Ignore? */
 153                 } else {
 154                         ERROR_WITH_ERRNO("failed to set UNIX file mode");
 155                         return WIMLIB_ERR_INVALID_DENTRY;
 156                 }
 157         }
 158         return 0;
 159 }
 160
 161 static int dir_apply_unix_data(const char *dir,
 162                                const struct wimlib_unix_data *unix_data)
 163 {
 164         int dfd = open(dir, O_RDONLY);
 165         int ret;
 166         if (dfd >= 0) {
 167                 ret = fd_apply_unix_data(dfd, unix_data);
 168                 if (close(dfd)) {
 169                         ERROR_WITH_ERRNO("can't close directory `%s'", dir);
 170                         ret = WIMLIB_ERR_MKDIR;
 171                 }
 172         } else {
 173                 ERROR_WITH_ERRNO("can't open directory `%s'", dir);
 174                 ret = WIMLIB_ERR_MKDIR;
 175         }
 176         return ret;
 177 }
 178
 179 static int extract_regular_file_unlinked(struct wim_dentry *dentry,
 180                                          struct apply_args *args,
 181                                          const char *output_path,
 182                                          struct wim_lookup_table_entry *lte)
 183 {
 184         /* Normal mode of extraction.  Regular files and hard links are
 185          * extracted in the way that they appear in the WIM. */
 186
 187         int out_fd;
 188         int ret;
 189         struct wim_inode *inode = dentry->d_inode;
 190
 191         if (!((args->extract_flags & WIMLIB_EXTRACT_FLAG_MULTI_IMAGE)
 192                 && (args->extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 193                                      WIMLIB_EXTRACT_FLAG_HARDLINK))))
 194         {
 195                 /* If the dentry is part of a hard link set of at least 2
 196                  * dentries and one of the other dentries has already been
 197                  * extracted, make a hard link to the file corresponding to this
 198                  * already-extracted directory.  Otherwise, extract the file and
 199                  * set the inode->i_extracted_file field so that other dentries
 200                  * in the hard link group can link to it. */
 201                 if (inode->i_nlink > 1) {
 202                         if (inode->i_extracted_file) {
 203                                 DEBUG("Extracting hard link `%s' => `%s'",
 204                                       output_path, inode->i_extracted_file);
 205                                 if (link(inode->i_extracted_file, output_path) != 0) {
 206                                         ERROR_WITH_ERRNO("Failed to hard link "
 207                                                          "`%s' to `%s'",
 208                                                          output_path,
 209                                                          inode->i_extracted_file);
 210                                         return WIMLIB_ERR_LINK;
 211                                 }
 212                                 return 0;
 213                         }
 214                         FREE(inode->i_extracted_file);
 215                         inode->i_extracted_file = STRDUP(output_path);
 216                         if (!inode->i_extracted_file) {
 217                                 ERROR("Failed to allocate memory for filename");
 218                                 return WIMLIB_ERR_NOMEM;
 219                         }
 220                 }
 221         }
 222
 223         /* Extract the contents of the file to @output_path. */
 224
 225         out_fd = open(output_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 226         if (out_fd == -1) {
 227                 ERROR_WITH_ERRNO("Failed to open the file `%s' for writing",
 228                                  output_path);
 229                 return WIMLIB_ERR_OPEN;
 230         }
 231
 232         if (!lte) {
 233                 /* Empty file with no lookup table entry */
 234                 DEBUG("Empty file `%s'.", output_path);
 235                 ret = 0;
 236                 goto out_extract_unix_data;
 237         }
 238
 239         ret = extract_wim_resource_to_fd(lte, out_fd, wim_resource_size(lte));
 240         if (ret != 0) {
 241                 ERROR("Failed to extract resource to `%s'", output_path);
 242                 goto out;
 243         }
 244
 245 out_extract_unix_data:
 246         if (args->extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) {
 247                 struct wimlib_unix_data unix_data;
 248                 ret = inode_get_unix_data(inode, &unix_data, NULL);
 249                 if (ret > 0)
 250                         ;
 251                 else if (ret < 0)
 252                         ret = 0;
 253                 else
 254                         ret = fd_apply_unix_data(out_fd, &unix_data);
 255                 if (ret != 0)
 256                         goto out;
 257         }
 258         if (lte)
 259                 args->progress.extract.completed_bytes += wim_resource_size(lte);
 260 out:
 261         if (close(out_fd) != 0) {
 262                 ERROR_WITH_ERRNO("Failed to close file `%s'", output_path);
 263                 if (ret == 0)
 264                         ret = WIMLIB_ERR_WRITE;
 265         }
 266         return ret;
 267 }
 268
 269 static int extract_regular_file(struct wim_dentry *dentry,
 270                                 struct apply_args *args,
 271                                 const char *output_path)
 272 {
 273         struct wim_lookup_table_entry *lte;
 274         const struct wim_inode *inode = dentry->d_inode;
 275
 276         lte = inode_unnamed_lte_resolved(inode);
 277
 278         if (lte && (args->extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 279                                            WIMLIB_EXTRACT_FLAG_HARDLINK)))
 280         {
 281                 if (lte->extracted_file) {
 282                         return extract_regular_file_linked(dentry, output_path, args, lte);
 283                 } else {
 284                         lte->extracted_file = STRDUP(output_path);
 285                         if (!lte->extracted_file)
 286                                 return WIMLIB_ERR_NOMEM;
 287                 }
 288         }
 289         return extract_regular_file_unlinked(dentry, args, output_path, lte);
 290 }
 291
 292 static int extract_symlink(struct wim_dentry *dentry,
 293                            struct apply_args *args,
 294                            const char *output_path)
 295 {
 296         char target[4096];
 297         ssize_t ret = inode_readlink(dentry->d_inode, target,
 298                                      sizeof(target), args->w, 0);
 299         struct wim_lookup_table_entry *lte;
 300
 301         if (ret <= 0) {
 302                 ERROR("Could not read the symbolic link from dentry `%s'",
 303                       dentry->full_path_utf8);
 304                 return WIMLIB_ERR_INVALID_DENTRY;
 305         }
 306         ret = symlink(target, output_path);
 307         if (ret != 0) {
 308                 ERROR_WITH_ERRNO("Failed to symlink `%s' to `%s'",
 309                                  output_path, target);
 310                 return WIMLIB_ERR_LINK;
 311         }
 312         lte = inode_unnamed_lte_resolved(dentry->d_inode);
 313         wimlib_assert(lte != NULL);
 314         if (args->extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) {
 315                 struct wimlib_unix_data unix_data;
 316                 ret = inode_get_unix_data(dentry->d_inode, &unix_data, NULL);
 317                 if (ret > 0)
 318                         ;
 319                 else if (ret < 0)
 320                         ret = 0;
 321                 else
 322                         ret = symlink_apply_unix_data(output_path, &unix_data);
 323                 if (ret != 0)
 324                         return ret;
 325         }
 326         args->progress.extract.completed_bytes += wim_resource_size(lte);
 327         return 0;
 328 }
 329
 330 #endif /* !__WIN32__ */
 331
 332 static int extract_directory(struct wim_dentry *dentry,
 333                              const char *output_path, bool is_root)
 334 {
 335         int ret;
 336         struct stat stbuf;
 337
 338         ret = stat(output_path, &stbuf);
 339         if (ret == 0) {
 340                 if (S_ISDIR(stbuf.st_mode)) {
 341                         /*if (!is_root)*/
 342                                 /*WARNING("`%s' already exists", output_path);*/
 343                         goto dir_exists;
 344                 } else {
 345                         ERROR("`%s' is not a directory", output_path);
 346                         return WIMLIB_ERR_MKDIR;
 347                 }
 348         } else {
 349                 if (errno != ENOENT) {
 350                         ERROR_WITH_ERRNO("Failed to stat `%s'", output_path);
 351                         return WIMLIB_ERR_STAT;
 352                 }
 353         }
 354         if (mkdir(output_path, S_IRWXU | S_IRGRP | S_IXGRP |
 355                                S_IROTH | S_IXOTH) != 0) {
 356                 ERROR_WITH_ERRNO("Cannot create directory `%s'",
 357                                  output_path);
 358                 return WIMLIB_ERR_MKDIR;
 359         }
 360 dir_exists:
 361         ret = 0;
 362 #ifndef __WIN32__
 363         if (dentry) {
 364                 struct wimlib_unix_data unix_data;
 365                 ret = inode_get_unix_data(dentry->d_inode, &unix_data, NULL);
 366                 if (ret > 0)
 367                         ;
 368                 else if (ret < 0)
 369                         ret = 0;
 370                 else
 371                         ret = dir_apply_unix_data(output_path, &unix_data);
 372         }
 373 #endif
 374         return ret;
 375 }
 376
 377 #ifndef __WIN32__
 378 static int unix_apply_dentry(const char *output_path,
 379                              size_t output_path_len,
 380                              const struct wim_dentry *dentry,
 381                              const struct apply_args *args)
 382 {
 383         const struct wim_inode *inode = dentry->d_inode;
 384
 385         if (inode_is_symlink(inode))
 386                 return extract_symlink(dentry, args, output_path);
 387         else if (inode_is_directory(inode))
 388                 return extract_directory((args->extract_flags &
 389                                            WIMLIB_EXTRACT_FLAG_UNIX_DATA) ? dentry : NULL,
 390                                          output_path, false);
 391         else
 392                 return extract_regular_file(dentry, args, output_path);
 393 }
 394
 395 static int unix_apply_dentry_timestamps(const char *output_path,
 396                                         size_t output_path_len,
 397                                         const struct wim_dentry *dentry,
 398                                         struct apply_args *args)
 399 {
 400         int ret;
 401         /* Convert the WIM timestamps, which are accurate to 100 nanoseconds,
 402          * into struct timeval's. */
 403         struct timeval tv[2];
 404         wim_timestamp_to_timeval(inode->i_last_access_time, &tv[0]);
 405         wim_timestamp_to_timeval(inode->i_last_write_time, &tv[1]);
 406         #ifdef HAVE_LUTIMES
 407         ret = lutimes(output_path, tv);
 408         #else
 409         ret = -1;
 410         errno = ENOSYS;
 411         #endif
 412         if (ret != 0) {
 413                 #ifdef HAVE_UTIME
 414                 if (errno == ENOSYS) {
 415                         struct utimbuf buf;
 416                         buf.actime = wim_timestamp_to_unix(inode->i_last_access_time);
 417                         buf.modtime = wim_timestamp_to_unix(inode->i_last_write_time);
 418                         if (utime(output_path, &buf) == 0)
 419                                 return 0;
 420                 }
 421                 #endif
 422                 if (errno != ENOSYS || args->num_lutimes_warnings < 10) {
 423                         /*WARNING_WITH_ERRNO("Failed to set timestamp on file `%s',*/
 424                                             /*output_path");*/
 425                         args->num_lutimes_warnings++;
 426                 }
 427         }
 428         return 0;
 429 }
 430 #endif /* !__WIN32__ */
 431
 432 /* Extracts a file, directory, or symbolic link from the WIM archive. */
 433 static int apply_dentry_normal(struct wim_dentry *dentry, void *arg)
 434 {
 435         struct apply_args *args = arg;
 436         struct wim_inode *inode = dentry->d_inode;
 437         size_t len;
 438         char *output_path;
 439
 440         len = strlen(args->target);
 441         if (dentry_is_root(dentry)) {
 442                 output_path = (char*)args->target;
 443         } else {
 444                 output_path = alloca(len + dentry->full_path_utf8_len + 1);
 445                 memcpy(output_path, args->target, len);
 446                 memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len);
 447                 output_path[len + dentry->full_path_utf8_len] = '\0';
 448                 len += dentry->full_path_utf8_len;
 449         }
 450 #ifdef __WIN32__
 451         return win32_apply_dentry(output_path, len, dentry, args);
 452 #else
 453         return unix_apply_dentry(output_path, len, dentry, args);
 454 #endif
 455 }
 456
 457
 458 /* Apply timestamps to an extracted file or directory */
 459 static int apply_dentry_timestamps_normal(struct wim_dentry *dentry, void *arg)
 460 {
 461         struct apply_args *args = arg;
 462         size_t len;
 463         char *output_path;
 464
 465         len = strlen(args->target);
 466         if (dentry_is_root(dentry)) {
 467                 output_path = (char*)args->target;
 468         } else {
 469                 output_path = alloca(len + dentry->full_path_utf8_len + 1);
 470                 memcpy(output_path, args->target, len);
 471                 memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len);
 472                 output_path[len + dentry->full_path_utf8_len] = '\0';
 473                 len += dentry->full_path_utf8_len;
 474         }
 475 #ifdef __WIN32__
 476         return win32_apply_dentry_timestamps(output_path, len, dentry, args);
 477 #else
 478         return unix_apply_dentry_timestamps(output_path, len, dentry, args);
 479 #endif
 480 }
 481
 482 /* Extract a dentry if it hasn't already been extracted, and either the dentry
 483  * has no streams or WIMLIB_EXTRACT_FLAG_NO_STREAMS is not specified. */
 484 static int maybe_apply_dentry(struct wim_dentry *dentry, void *arg)
 485 {
 486         struct apply_args *args = arg;
 487         int ret;
 488
 489         if (dentry->is_extracted)
 490                 return 0;
 491
 492         if (args->extract_flags & WIMLIB_EXTRACT_FLAG_NO_STREAMS)
 493                 if (inode_unnamed_lte_resolved(dentry->d_inode))
 494                         return 0;
 495
 496         if ((args->extract_flags & WIMLIB_EXTRACT_FLAG_VERBOSE) &&
 497              args->progress_func) {
 498                 args->progress.extract.cur_path = dentry->full_path_utf8;
 499                 args->progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DENTRY,
 500                                     &args->progress);
 501         }
 502         ret = args->apply_dentry(dentry, args);
 503         if (ret == 0)
 504                 dentry->is_extracted = 1;
 505         return ret;
 506 }
 507
 508 static int cmp_streams_by_wim_position(const void *p1, const void *p2)
 509 {
 510         const struct wim_lookup_table_entry *lte1, *lte2;
 511         lte1 = *(const struct wim_lookup_table_entry**)p1;
 512         lte2 = *(const struct wim_lookup_table_entry**)p2;
 513         if (lte1->resource_entry.offset < lte2->resource_entry.offset)
 514                 return -1;
 515         else if (lte1->resource_entry.offset > lte2->resource_entry.offset)
 516                 return 1;
 517         else
 518                 return 0;
 519 }
 520
 521 static int sort_stream_list_by_wim_position(struct list_head *stream_list)
 522 {
 523         struct list_head *cur;
 524         size_t num_streams;
 525         struct wim_lookup_table_entry **array;
 526         size_t i;
 527         size_t array_size;
 528
 529         num_streams = 0;
 530         list_for_each(cur, stream_list)
 531                 num_streams++;
 532         array_size = num_streams * sizeof(array[0]);
 533         array = MALLOC(array_size);
 534         if (!array) {
 535                 ERROR("Failed to allocate %zu bytes to sort stream entries",
 536                       array_size);
 537                 return WIMLIB_ERR_NOMEM;
 538         }
 539         cur = stream_list->next;
 540         for (i = 0; i < num_streams; i++) {
 541                 array[i] = container_of(cur, struct wim_lookup_table_entry, staging_list);
 542                 cur = cur->next;
 543         }
 544
 545         qsort(array, num_streams, sizeof(array[0]), cmp_streams_by_wim_position);
 546
 547         INIT_LIST_HEAD(stream_list);
 548         for (i = 0; i < num_streams; i++)
 549                 list_add_tail(&array[i]->staging_list, stream_list);
 550         FREE(array);
 551         return 0;
 552 }
 553
 554 static void calculate_bytes_to_extract(struct list_head *stream_list,
 555                                        int extract_flags,
 556                                        union wimlib_progress_info *progress)
 557 {
 558         struct wim_lookup_table_entry *lte;
 559         u64 total_bytes = 0;
 560         u64 num_streams = 0;
 561
 562         /* For each stream to be extracted... */
 563         list_for_each_entry(lte, stream_list, staging_list) {
 564                 if (extract_flags &
 565                     (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
 566                 {
 567                         /* In the symlink or hard link extraction mode, each
 568                          * stream will be extracted one time regardless of how
 569                          * many dentries share the stream. */
 570                         wimlib_assert(!(extract_flags & WIMLIB_EXTRACT_FLAG_NTFS));
 571                         if (!lte->extracted_file) {
 572                                 num_streams++;
 573                                 total_bytes += wim_resource_size(lte);
 574                         }
 575                 } else {
 576                         num_streams += lte->out_refcnt;
 577                         total_bytes += lte->out_refcnt * wim_resource_size(lte);
 578                 }
 579         }
 580         progress->extract.num_streams = num_streams;
 581         progress->extract.total_bytes = total_bytes;
 582         progress->extract.completed_bytes = 0;
 583 }
 584
 585 static void maybe_add_stream_for_extraction(struct wim_lookup_table_entry *lte,
 586                                             struct list_head *stream_list)
 587 {
 588         if (++lte->out_refcnt == 1) {
 589                 INIT_LIST_HEAD(&lte->inode_list);
 590                 list_add_tail(&lte->staging_list, stream_list);
 591         }
 592 }
 593
 594 static void inode_find_streams_for_extraction(struct wim_inode *inode,
 595                                               struct list_head *stream_list,
 596                                               int extract_flags)
 597 {
 598         struct wim_lookup_table_entry *lte;
 599         bool inode_added = false;
 600
 601         lte = inode_unnamed_lte_resolved(inode);
 602         if (lte) {
 603                 maybe_add_stream_for_extraction(lte, stream_list);
 604                 list_add_tail(&inode->i_lte_inode_list, &lte->inode_list);
 605                 inode_added = true;
 606         }
 607 #ifdef WITH_NTFS_3G
 608         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 609                 for (unsigned i = 0; i < inode->i_num_ads; i++) {
 610                         if (inode->i_ads_entries[i].stream_name_len != 0) {
 611                                 lte = inode->i_ads_entries[i].lte;
 612                                 if (lte) {
 613                                         maybe_add_stream_for_extraction(lte,
 614                                                                         stream_list);
 615                                         if (!inode_added) {
 616                                                 list_add_tail(&inode->i_lte_inode_list,
 617                                                               &lte->inode_list);
 618                                                 inode_added = true;
 619                                         }
 620                                 }
 621                         }
 622                 }
 623         }
 624 #endif
 625 }
 626
 627 static void find_streams_for_extraction(struct hlist_head *inode_list,
 628                                         struct list_head *stream_list,
 629                                         struct wim_lookup_table *lookup_table,
 630                                         int extract_flags)
 631 {
 632         struct wim_inode *inode;
 633         struct hlist_node *cur;
 634         struct wim_dentry *dentry;
 635
 636         for_lookup_table_entry(lookup_table, lte_zero_out_refcnt, NULL);
 637         INIT_LIST_HEAD(stream_list);
 638         hlist_for_each_entry(inode, cur, inode_list, i_hlist) {
 639                 if (!inode->i_resolved)
 640                         inode_resolve_ltes(inode, lookup_table);
 641                 inode_for_each_dentry(dentry, inode)
 642                         dentry->is_extracted = 0;
 643                 inode_find_streams_for_extraction(inode, stream_list,
 644                                                   extract_flags);
 645         }
 646 }
 647
 648 struct apply_operations {
 649         int (*apply_dentry)(struct wim_dentry *dentry, void *arg);
 650         int (*apply_dentry_timestamps)(struct wim_dentry *dentry, void *arg);
 651 };
 652
 653 static const struct apply_operations normal_apply_operations = {
 654         .apply_dentry = apply_dentry_normal,
 655         .apply_dentry_timestamps = apply_dentry_timestamps_normal,
 656 };
 657
 658 #ifdef WITH_NTFS_3G
 659 static const struct apply_operations ntfs_apply_operations = {
 660         .apply_dentry = apply_dentry_ntfs,
 661         .apply_dentry_timestamps = apply_dentry_timestamps_ntfs,
 662 };
 663 #endif
 664
 665 static int apply_stream_list(struct list_head *stream_list,
 666                              struct apply_args *args,
 667                              const struct apply_operations *ops,
 668                              wimlib_progress_func_t progress_func)
 669 {
 670         uint64_t bytes_per_progress = args->progress.extract.total_bytes / 100;
 671         uint64_t next_progress = bytes_per_progress;
 672         struct wim_lookup_table_entry *lte;
 673         struct wim_inode *inode;
 674         struct wim_dentry *dentry;
 675         int ret;
 676
 677         /* This complicated loop is essentially looping through the dentries,
 678          * although dentries may be visited more than once (if a dentry contains
 679          * two different nonempty streams) or not at all (if a dentry contains
 680          * no non-empty streams).
 681          *
 682          * The outer loop is over the distinct streams to be extracted so that
 683          * sequential reading of the WIM can be implemented. */
 684
 685         /* For each distinct stream to be extracted */
 686         list_for_each_entry(lte, stream_list, staging_list) {
 687                 /* For each inode that contains the stream */
 688                 list_for_each_entry(inode, &lte->inode_list, i_lte_inode_list) {
 689                         /* For each dentry that points to the inode */
 690                         inode_for_each_dentry(dentry, inode) {
 691                                 /* Extract the dentry if it was not already
 692                                  * extracted */
 693                                 ret = maybe_apply_dentry(dentry, args);
 694                                 if (ret != 0)
 695                                         return ret;
 696                                 if (progress_func &&
 697                                     args->progress.extract.completed_bytes >= next_progress)
 698                                 {
 699                                         progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS,
 700                                                       &args->progress);
 701                                         if (args->progress.extract.completed_bytes >=
 702                                             args->progress.extract.total_bytes)
 703                                         {
 704                                                 next_progress = ~0ULL;
 705                                         } else {
 706                                                 next_progress =
 707                                                         min (args->progress.extract.completed_bytes +
 708                                                              bytes_per_progress,
 709                                                              args->progress.extract.total_bytes);
 710                                         }
 711                                 }
 712                         }
 713                 }
 714         }
 715         return 0;
 716 }
 717
 718 /* Extracts the image @image from the WIM @w to the directory or NTFS volume
 719  * @target. */
 720 static int extract_single_image(WIMStruct *w, int image,
 721                                 const char *target, int extract_flags,
 722                                 wimlib_progress_func_t progress_func)
 723 {
 724         int ret;
 725         struct list_head stream_list;
 726         struct hlist_head *inode_list;
 727
 728         struct apply_args args;
 729         const struct apply_operations *ops;
 730
 731         args.w                    = w;
 732         args.target               = target;
 733         args.extract_flags        = extract_flags;
 734         args.num_lutimes_warnings = 0;
 735         args.stream_list          = &stream_list;
 736         args.progress_func        = progress_func;
 737
 738         if (progress_func) {
 739                 args.progress.extract.wimfile_name = w->filename;
 740                 args.progress.extract.image = image;
 741                 args.progress.extract.extract_flags = (extract_flags &
 742                                                        WIMLIB_EXTRACT_MASK_PUBLIC);
 743                 args.progress.extract.image_name = wimlib_get_image_name(w, image);
 744                 args.progress.extract.target = target;
 745         }
 746
 747 #ifdef WITH_NTFS_3G
 748         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 749                 args.vol = ntfs_mount(target, 0);
 750                 if (!args.vol) {
 751                         ERROR_WITH_ERRNO("Failed to mount NTFS volume `%s'", target);
 752                         return WIMLIB_ERR_NTFS_3G;
 753                 }
 754                 ops = &ntfs_apply_operations;
 755         } else
 756 #endif
 757                 ops = &normal_apply_operations;
 758
 759         ret = select_wim_image(w, image);
 760         if (ret != 0)
 761                 goto out;
 762
 763         inode_list = &w->image_metadata[image - 1].inode_list;
 764
 765         /* Build a list of the streams that need to be extracted */
 766         find_streams_for_extraction(inode_list, &stream_list,
 767                                     w->lookup_table, extract_flags);
 768
 769         /* Calculate the number of bytes of data that will be extracted */
 770         calculate_bytes_to_extract(&stream_list, extract_flags,
 771                                    &args.progress);
 772
 773         if (progress_func) {
 774                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN,
 775                               &args.progress);
 776         }
 777
 778         /* If a sequential extraction was specified, sort the streams to be
 779          * extracted by their position in the WIM file, so that the WIM file can
 780          * be read sequentially. */
 781         if (extract_flags & WIMLIB_EXTRACT_FLAG_SEQUENTIAL) {
 782                 ret = sort_stream_list_by_wim_position(&stream_list);
 783                 if (ret != 0) {
 784                         WARNING("Falling back to non-sequential extraction");
 785                         extract_flags &= ~WIMLIB_EXTRACT_FLAG_SEQUENTIAL;
 786                 }
 787         }
 788
 789         if (progress_func) {
 790                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_BEGIN,
 791                               &args.progress);
 792         }
 793
 794         /* Make the directory structure and extract empty files */
 795         args.extract_flags |= WIMLIB_EXTRACT_FLAG_NO_STREAMS;
 796         args.apply_dentry = ops->apply_dentry;
 797         ret = for_dentry_in_tree(wim_root_dentry(w), maybe_apply_dentry, &args);
 798         args.extract_flags &= ~WIMLIB_EXTRACT_FLAG_NO_STREAMS;
 799         if (ret != 0)
 800                 goto out;
 801
 802         if (progress_func) {
 803                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_END,
 804                               &args.progress);
 805         }
 806
 807         /* Extract non-empty files */
 808         ret = apply_stream_list(&stream_list, &args, ops, progress_func);
 809         if (ret != 0)
 810                 goto out;
 811
 812         if (progress_func) {
 813                 progress_func(WIMLIB_PROGRESS_MSG_APPLY_TIMESTAMPS,
 814                               &args.progress);
 815         }
 816
 817         /* Apply timestamps */
 818         ret = for_dentry_in_tree_depth(wim_root_dentry(w),
 819                                        ops->apply_dentry_timestamps, &args);
 820         if (ret != 0)
 821                 goto out;
 822
 823         if (progress_func) {
 824                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_END,
 825                               &args.progress);
 826         }
 827 out:
 828 #ifdef WITH_NTFS_3G
 829         /* Unmount the NTFS volume */
 830         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 831                 if (ntfs_umount(args.vol, FALSE) != 0) {
 832                         ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%s'", args.target);
 833                         if (ret == 0)
 834                                 ret = WIMLIB_ERR_NTFS_3G;
 835                 }
 836         }
 837 #endif
 838         return ret;
 839 }
 840
 841
 842 /* Extracts all images from the WIM to the directory @target, with the images
 843  * placed in subdirectories named by their image names. */
 844 static int extract_all_images(WIMStruct *w, const char *target,
 845                               int extract_flags,
 846                               wimlib_progress_func_t progress_func)
 847 {
 848         size_t image_name_max_len = max(xml_get_max_image_name_len(w), 20);
 849         size_t output_path_len = strlen(target);
 850         char buf[output_path_len + 1 + image_name_max_len + 1];
 851         int ret;
 852         int image;
 853         const char *image_name;
 854
 855         ret = extract_directory(NULL, target, true);
 856         if (ret != 0)
 857                 return ret;
 858
 859         memcpy(buf, target, output_path_len);
 860         buf[output_path_len] = '/';
 861         for (image = 1; image <= w->hdr.image_count; image++) {
 862                 image_name = wimlib_get_image_name(w, image);
 863                 if (image_name && *image_name) {
 864                         strcpy(buf + output_path_len + 1, image_name);
 865                 } else {
 866                         /* Image name is empty. Use image number instead */
 867                         sprintf(buf + output_path_len + 1, "%d", image);
 868                 }
 869                 ret = extract_single_image(w, image, buf, extract_flags,
 870                                            progress_func);
 871                 if (ret != 0)
 872                         return ret;
 873         }
 874         return 0;
 875 }
 876
 877 /* Extracts a single image or all images from a WIM file to a directory or NTFS
 878  * volume. */
 879 WIMLIBAPI int wimlib_extract_image(WIMStruct *w,
 880                                    int image,
 881                                    const char *target,
 882                                    int extract_flags,
 883                                    WIMStruct **additional_swms,
 884                                    unsigned num_additional_swms,
 885                                    wimlib_progress_func_t progress_func)
 886 {
 887         struct wim_lookup_table *joined_tab, *w_tab_save;
 888         int ret;
 889
 890         if (!target)
 891                 return WIMLIB_ERR_INVALID_PARAM;
 892
 893         extract_flags &= WIMLIB_EXTRACT_MASK_PUBLIC;
 894
 895         if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
 896                         == (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
 897                 return WIMLIB_ERR_INVALID_PARAM;
 898
 899 #ifdef __WIN32__
 900         if (extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) {
 901                 ERROR("Extracting UNIX data is not supported on Windows");
 902                 return WIMLIB_ERR_INVALID_PARAM;
 903         }
 904         if (extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK)) {
 905                 ERROR("Linked extraction modes are not supported on Windows");
 906                 return WIMLIB_ERR_INVALID_PARAM;
 907         }
 908 #endif
 909
 910         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 911 #ifdef WITH_NTFS_3G
 912                 if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))) {
 913                         ERROR("Cannot specify symlink or hardlink flags when applying\n"
 914                               "        directly to a NTFS volume");
 915                         return WIMLIB_ERR_INVALID_PARAM;
 916                 }
 917                 if (image == WIMLIB_ALL_IMAGES) {
 918                         ERROR("Can only apply a single image when applying "
 919                               "directly to a NTFS volume");
 920                         return WIMLIB_ERR_INVALID_PARAM;
 921                 }
 922                 if (extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) {
 923                         ERROR("Cannot restore UNIX-specific data in the NTFS extraction mode");
 924                         return WIMLIB_ERR_INVALID_PARAM;
 925                 }
 926 #else
 927                 ERROR("wimlib was compiled without support for NTFS-3g, so");
 928                 ERROR("we cannot apply a WIM image directly to a NTFS volume");
 929                 return WIMLIB_ERR_UNSUPPORTED;
 930 #endif
 931         }
 932
 933         ret = verify_swm_set(w, additional_swms, num_additional_swms);
 934         if (ret != 0)
 935                 return ret;
 936
 937         if (num_additional_swms) {
 938                 ret = new_joined_lookup_table(w, additional_swms,
 939                                               num_additional_swms, &joined_tab);
 940                 if (ret != 0)
 941                         return ret;
 942                 w_tab_save = w->lookup_table;
 943                 w->lookup_table = joined_tab;
 944         }
 945
 946 #ifdef __WIN32__
 947         win32_acquire_restore_privileges();
 948 #endif
 949         if (image == WIMLIB_ALL_IMAGES) {
 950                 extract_flags |= WIMLIB_EXTRACT_FLAG_MULTI_IMAGE;
 951                 ret = extract_all_images(w, target, extract_flags,
 952                                          progress_func);
 953         } else {
 954                 extract_flags &= ~WIMLIB_EXTRACT_FLAG_MULTI_IMAGE;
 955                 ret = extract_single_image(w, image, target, extract_flags,
 956                                            progress_func);
 957         }
 958 #ifdef __WIN32__
 959         win32_release_restore_privileges();
 960 #endif
 961
 962         if (extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 963                              WIMLIB_EXTRACT_FLAG_HARDLINK))
 964         {
 965                 for_lookup_table_entry(w->lookup_table,
 966                                        lte_free_extracted_file,
 967                                        NULL);
 968         }
 969
 970         if (num_additional_swms) {
 971                 free_lookup_table(w->lookup_table);
 972                 w->lookup_table = w_tab_save;
 973         }
 974         return ret;
 975 }