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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 #if defined(__CYGWIN__) || defined(__WIN32__)
  29 #       include <windows.h>
  30 #       ifdef ERROR
  31 #               undef ERROR
  32 #       endif
  33 #       include <wchar.h>
  34 #else
  35 #       include <dirent.h>
  36 #       ifdef HAVE_UTIME_H
  37 #               include <utime.h>
  38 #       endif
  39 #       include "timestamp.h"
  40 #       include <sys/time.h>
  41 #endif
  42
  43 #include <errno.h>
  44 #include <fcntl.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <sys/stat.h>
  48
  49 #include <unistd.h>
  50
  51 #include "dentry.h"
  52 #include "lookup_table.h"
  53 #include "wimlib_internal.h"
  54 #include "xml.h"
  55
  56 #ifdef WITH_NTFS_3G
  57 #include <ntfs-3g/volume.h>
  58 #endif
  59
  60 #ifdef HAVE_ALLOCA_H
  61 #include <alloca.h>
  62 #endif
  63
  64 #if defined(__CYGWIN__) || defined(__WIN32__)
  65
  66 static int win32_set_reparse_data(HANDLE h,
  67                                   u32 reparse_tag,
  68                                   const struct wim_lookup_table_entry *lte,
  69                                   const wchar_t *path)
  70 {
  71         int ret;
  72         u8 *buf;
  73         size_t len;
  74
  75         if (!lte) {
  76                 WARNING("\"%ls\" is marked as a reparse point but had no reparse data",
  77                         path);
  78                 return 0;
  79         }
  80         len = wim_resource_size(lte);
  81         if (len > 16 * 1024 - 8) {
  82                 WARNING("\"%ls\": reparse data too long!", path);
  83                 return 0;
  84         }
  85
  86         /* The WIM stream omits the ReparseTag and ReparseDataLength fields, so
  87          * leave 8 bytes of space for them at the beginning of the buffer, then
  88          * set them manually. */
  89         buf = alloca(len + 8);
  90         ret = read_full_wim_resource(lte, buf + 8, 0);
  91         if (ret)
  92                 return ret;
  93         *(u32*)(buf + 0) = reparse_tag;
  94         *(u16*)(buf + 4) = len;
  95         *(u16*)(buf + 6) = 0;
  96
  97         /* Set the reparse data on the open file using the
  98          * FSCTL_SET_REPARSE_POINT ioctl.
  99          *
 100          * There are contradictions in Microsoft's documentation for this:
 101          *
 102          * "If hDevice was opened without specifying FILE_FLAG_OVERLAPPED,
 103          * lpOverlapped is ignored."
 104          *
 105          * --- So setting lpOverlapped to NULL is okay since it's ignored.
 106          *
 107          * "If lpOverlapped is NULL, lpBytesReturned cannot be NULL. Even when an
 108          * operation returns no output data and lpOutBuffer is NULL,
 109          * DeviceIoControl makes use of lpBytesReturned. After such an
 110          * operation, the value of lpBytesReturned is meaningless."
 111          *
 112          * --- So lpOverlapped not really ignored, as it affects another
 113          *  parameter.  This is the actual behavior: lpBytesReturned must be
 114          *  specified, even though lpBytesReturned is documented as:
 115          *
 116          *  "Not used with this operation; set to NULL."
 117          */
 118         DWORD bytesReturned;
 119         if (!DeviceIoControl(h, FSCTL_SET_REPARSE_POINT, buf, len + 8,
 120                              NULL, 0,
 121                              &bytesReturned /* lpBytesReturned */,
 122                              NULL /* lpOverlapped */))
 123         {
 124                 DWORD err = GetLastError();
 125                 ERROR("Failed to set reparse data on \"%ls\"", path);
 126                 win32_error(err);
 127                 return WIMLIB_ERR_WRITE;
 128         }
 129         return 0;
 130 }
 131
 132
 133 static int win32_extract_chunk(const u8 *buf, size_t len, u64 offset, void *arg)
 134 {
 135         HANDLE hStream = arg;
 136
 137         DWORD nbytes_written;
 138         wimlib_assert(len <= 0xffffffff);
 139
 140         if (!WriteFile(hStream, buf, len, &nbytes_written, NULL) ||
 141             nbytes_written != len)
 142         {
 143                 DWORD err = GetLastError();
 144                 ERROR("WriteFile(): write error");
 145                 win32_error(err);
 146                 return WIMLIB_ERR_WRITE;
 147         }
 148         return 0;
 149 }
 150
 151 static int do_win32_extract_stream(HANDLE hStream, struct wim_lookup_table_entry *lte)
 152 {
 153         return extract_wim_resource(lte, wim_resource_size(lte),
 154                                     win32_extract_chunk, hStream);
 155 }
 156
 157 static int win32_extract_stream(const struct wim_inode *inode,
 158                                 const wchar_t *path,
 159                                 const wchar_t *stream_name_utf16,
 160                                 struct wim_lookup_table_entry *lte)
 161 {
 162         wchar_t *stream_path;
 163         HANDLE h;
 164         int ret;
 165         DWORD err;
 166         DWORD creationDisposition = CREATE_ALWAYS;
 167
 168         if (stream_name_utf16) {
 169                 /* Named stream.  Create a buffer that contains the UTF-16LE
 170                  * string [./]@path:@stream_name_utf16.  This is needed to
 171                  * create and open the stream using CreateFileW().  I'm not
 172                  * aware of any other APIs to do this.  Note: note that the
 173                  * '$DATA' suffix seems to be unneeded; Additional note: a "./"
 174                  * prefix needs to be added when the path is not absolute to
 175                  * avoid ambiguity with drive letters. */
 176                 size_t stream_path_nchars;
 177                 size_t path_nchars;
 178                 size_t stream_name_nchars;
 179                 const wchar_t *prefix;
 180
 181                 path_nchars = wcslen(path);
 182                 stream_name_nchars = wcslen(stream_name_utf16);
 183                 stream_path_nchars = path_nchars + 1 + stream_name_nchars;
 184                 if (path[0] != L'/' && path[1] != L'\\') {
 185                         prefix = L"./";
 186                         stream_path_nchars += 2;
 187                 } else {
 188                         prefix = L"";
 189                 }
 190                 stream_path = alloca((stream_path_nchars + 1) * sizeof(wchar_t));
 191                 swprintf(stream_path, stream_path_nchars + 1, L"%ls%ls:%ls",
 192                          prefix, path, stream_name_utf16);
 193         } else {
 194                 /* Unnamed stream; it's path is just the path to the file
 195                  * itself. */
 196                 stream_path = (wchar_t*)path;
 197
 198                 /* Directories must be created with CreateDirectoryW().  Then
 199                  * the call to CreateFileW() will merely open the directory that
 200                  * was already created rather than creating a new file. */
 201                 if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY) {
 202                         if (!CreateDirectoryW(stream_path, NULL)) {
 203                                 err = GetLastError();
 204                                 if (err != ERROR_ALREADY_EXISTS) {
 205                                         ERROR("Failed to create directory \"%ls\"",
 206                                               path);
 207                                         win32_error(err);
 208                                         ret = WIMLIB_ERR_MKDIR;
 209                                         goto fail;
 210                                 }
 211                         }
 212                         DEBUG("Created directory \"%ls\"", stream_path);
 213                         if (!(inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT)) {
 214                                 ret = 0;
 215                                 goto out;
 216                         }
 217                         creationDisposition = OPEN_EXISTING;
 218                 }
 219         }
 220
 221         DEBUG("Opening \"%ls\"", stream_path);
 222         h = CreateFileW(stream_path,
 223                         GENERIC_WRITE | WRITE_OWNER | WRITE_DAC,
 224                         0,
 225                         NULL,
 226                         creationDisposition,
 227                         FILE_FLAG_OPEN_REPARSE_POINT |
 228                             FILE_FLAG_BACKUP_SEMANTICS |
 229                             inode->i_attributes,
 230                         NULL);
 231         if (h == INVALID_HANDLE_VALUE) {
 232                 err = GetLastError();
 233                 ERROR("Failed to create \"%ls\"", stream_path);
 234                 win32_error(err);
 235                 ret = WIMLIB_ERR_OPEN;
 236                 goto fail;
 237         }
 238
 239         if (inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT &&
 240             stream_name_utf16 == NULL)
 241         {
 242                 DEBUG("Setting reparse data on \"%ls\"", path);
 243                 ret = win32_set_reparse_data(h, inode->i_reparse_tag, lte, path);
 244                 if (ret)
 245                         goto fail_close_handle;
 246         } else {
 247                 if (lte) {
 248                         DEBUG("Extracting \"%ls\" (len = %zu)",
 249                               stream_path, wim_resource_size(lte));
 250                         ret = do_win32_extract_stream(h, lte);
 251                         if (ret)
 252                                 goto fail_close_handle;
 253                 }
 254         }
 255
 256         DEBUG("Closing \"%ls\"", stream_path);
 257         if (!CloseHandle(h)) {
 258                 err = GetLastError();
 259                 ERROR("Failed to close \"%ls\"", stream_path);
 260                 win32_error(err);
 261                 ret = WIMLIB_ERR_WRITE;
 262                 goto fail;
 263         }
 264         ret = 0;
 265         goto out;
 266 fail_close_handle:
 267         CloseHandle(h);
 268 fail:
 269         ERROR("Error extracting %ls", stream_path);
 270 out:
 271         return ret;
 272 }
 273
 274 /*
 275  * Creates a file, directory, or reparse point and extracts all streams to it
 276  * (unnamed data stream and/or reparse point stream, plus any alternate data
 277  * streams).  This in Win32-specific code.
 278  *
 279  * @inode:      WIM inode for this file or directory.
 280  * @path:       UTF-16LE external path to extract the inode to.
 281  *
 282  * Returns 0 on success; nonzero on failure.
 283  */
 284 static int win32_extract_streams(struct wim_inode *inode,
 285                                  const wchar_t *path)
 286 {
 287         struct wim_lookup_table_entry *unnamed_lte;
 288         int ret;
 289
 290         unnamed_lte = inode_unnamed_lte_resolved(inode);
 291         ret = win32_extract_stream(inode, path, NULL, unnamed_lte);
 292         if (ret)
 293                 goto out;
 294         for (u16 i = 0; i < inode->i_num_ads; i++) {
 295                 const struct wim_ads_entry *ads_entry = &inode->i_ads_entries[i];
 296                 if (ads_entry->stream_name_len != 0) {
 297                         /* Skip special UNIX data entries (see documentation for
 298                          * WIMLIB_ADD_IMAGE_FLAG_UNIX_DATA) */
 299                         if (ads_entry->stream_name_len == WIMLIB_UNIX_DATA_TAG_LEN
 300                             && !memcmp(ads_entry->stream_name_utf8,
 301                                        WIMLIB_UNIX_DATA_TAG,
 302                                        WIMLIB_UNIX_DATA_TAG_LEN))
 303                                 continue;
 304                         ret = win32_extract_stream(inode,
 305                                                    path,
 306                                                    (const wchar_t*)ads_entry->stream_name,
 307                                                    ads_entry->lte);
 308                         if (ret)
 309                                 break;
 310                 }
 311         }
 312 out:
 313         return ret;
 314 }
 315
 316 /*
 317  * Sets the security descriptor on an extracted file.  This is Win32-specific
 318  * code.
 319  *
 320  * @inode:      The WIM inode that was extracted and has a security descriptor.
 321  * @path:       UTF-16LE external path that the inode was extracted to.
 322  * @sd:         Security data for the WIM image.
 323  * @path_utf8:  @path in UTF-8 for error messages only.
 324  *
 325  * Returns 0 on success; nonzero on failure.
 326  */
 327 static int win32_set_security_data(const struct wim_inode *inode,
 328                                    const wchar_t *path,
 329                                    const struct wim_security_data *sd)
 330 {
 331         SECURITY_INFORMATION securityInformation = DACL_SECURITY_INFORMATION |
 332                                                    SACL_SECURITY_INFORMATION |
 333                                                    OWNER_SECURITY_INFORMATION |
 334                                                    GROUP_SECURITY_INFORMATION;
 335         if (!SetFileSecurityW(path, securityInformation,
 336                               (PSECURITY_DESCRIPTOR)sd->descriptors[inode->i_security_id]))
 337         {
 338                 DWORD err = GetLastError();
 339                 ERROR("Can't set security descriptor on \"%ls\"", path);
 340                 win32_error(err);
 341                 return WIMLIB_ERR_WRITE;
 342         }
 343         return 0;
 344 }
 345
 346 #else /* __CYGWIN__ || __WIN32__ */
 347 static int extract_regular_file_linked(struct wim_dentry *dentry,
 348                                        const char *output_path,
 349                                        struct apply_args *args,
 350                                        struct wim_lookup_table_entry *lte)
 351 {
 352         /* This mode overrides the normal hard-link extraction and
 353          * instead either symlinks or hardlinks *all* identical files in
 354          * the WIM, even if they are in a different image (in the case
 355          * of a multi-image extraction) */
 356
 357         if (args->extract_flags & WIMLIB_EXTRACT_FLAG_HARDLINK) {
 358                 if (link(lte->extracted_file, output_path) != 0) {
 359                         ERROR_WITH_ERRNO("Failed to hard link "
 360                                          "`%s' to `%s'",
 361                                          output_path, lte->extracted_file);
 362                         return WIMLIB_ERR_LINK;
 363                 }
 364         } else {
 365                 int num_path_components;
 366                 int num_output_dir_path_components;
 367                 size_t extracted_file_len;
 368                 char *p;
 369                 const char *p2;
 370                 size_t i;
 371
 372                 num_path_components =
 373                         get_num_path_components(dentry->full_path_utf8) - 1;
 374                 num_output_dir_path_components =
 375                         get_num_path_components(args->target);
 376
 377                 if (args->extract_flags & WIMLIB_EXTRACT_FLAG_MULTI_IMAGE) {
 378                         num_path_components++;
 379                         num_output_dir_path_components--;
 380                 }
 381                 extracted_file_len = strlen(lte->extracted_file);
 382
 383                 char buf[extracted_file_len + 3 * num_path_components + 1];
 384                 p = &buf[0];
 385
 386                 for (i = 0; i < num_path_components; i++) {
 387                         *p++ = '.';
 388                         *p++ = '.';
 389                         *p++ = '/';
 390                 }
 391                 p2 = lte->extracted_file;
 392                 while (*p2 == '/')
 393                         p2++;
 394                 while (num_output_dir_path_components--)
 395                         p2 = path_next_part(p2, NULL);
 396                 strcpy(p, p2);
 397                 if (symlink(buf, output_path) != 0) {
 398                         ERROR_WITH_ERRNO("Failed to symlink `%s' to "
 399                                          "`%s'",
 400                                          buf, lte->extracted_file);
 401                         return WIMLIB_ERR_LINK;
 402                 }
 403         }
 404         return 0;
 405 }
 406
 407 static int symlink_apply_unix_data(const char *link,
 408                                    const struct wimlib_unix_data *unix_data)
 409 {
 410         if (lchown(link, unix_data->uid, unix_data->gid)) {
 411                 if (errno == EPERM) {
 412                         /* Ignore */
 413                         WARNING_WITH_ERRNO("failed to set symlink UNIX owner/group");
 414                 } else {
 415                         ERROR_WITH_ERRNO("failed to set symlink UNIX owner/group");
 416                         return WIMLIB_ERR_INVALID_DENTRY;
 417                 }
 418         }
 419         return 0;
 420 }
 421
 422 static int fd_apply_unix_data(int fd, const struct wimlib_unix_data *unix_data)
 423 {
 424         if (fchown(fd, unix_data->uid, unix_data->gid)) {
 425                 if (errno == EPERM) {
 426                         WARNING_WITH_ERRNO("failed to set file UNIX owner/group");
 427                         /* Ignore? */
 428                 } else {
 429                         ERROR_WITH_ERRNO("failed to set file UNIX owner/group");
 430                         return WIMLIB_ERR_INVALID_DENTRY;
 431                 }
 432         }
 433
 434         if (fchmod(fd, unix_data->mode)) {
 435                 if (errno == EPERM) {
 436                         WARNING_WITH_ERRNO("failed to set UNIX file mode");
 437                         /* Ignore? */
 438                 } else {
 439                         ERROR_WITH_ERRNO("failed to set UNIX file mode");
 440                         return WIMLIB_ERR_INVALID_DENTRY;
 441                 }
 442         }
 443         return 0;
 444 }
 445
 446 static int dir_apply_unix_data(const char *dir,
 447                                const struct wimlib_unix_data *unix_data)
 448 {
 449         int dfd = open(dir, O_RDONLY);
 450         int ret;
 451         if (dfd >= 0) {
 452                 ret = fd_apply_unix_data(dfd, unix_data);
 453                 if (close(dfd)) {
 454                         ERROR_WITH_ERRNO("can't close directory `%s'", dir);
 455                         ret = WIMLIB_ERR_MKDIR;
 456                 }
 457         } else {
 458                 ERROR_WITH_ERRNO("can't open directory `%s'", dir);
 459                 ret = WIMLIB_ERR_MKDIR;
 460         }
 461         return ret;
 462 }
 463
 464 static int extract_regular_file_unlinked(struct wim_dentry *dentry,
 465                                          struct apply_args *args,
 466                                          const char *output_path,
 467                                          struct wim_lookup_table_entry *lte)
 468 {
 469         /* Normal mode of extraction.  Regular files and hard links are
 470          * extracted in the way that they appear in the WIM. */
 471
 472         int out_fd;
 473         int ret;
 474         struct wim_inode *inode = dentry->d_inode;
 475
 476         if (!((args->extract_flags & WIMLIB_EXTRACT_FLAG_MULTI_IMAGE)
 477                 && (args->extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 478                                      WIMLIB_EXTRACT_FLAG_HARDLINK))))
 479         {
 480                 /* If the dentry is part of a hard link set of at least 2
 481                  * dentries and one of the other dentries has already been
 482                  * extracted, make a hard link to the file corresponding to this
 483                  * already-extracted directory.  Otherwise, extract the file and
 484                  * set the inode->i_extracted_file field so that other dentries
 485                  * in the hard link group can link to it. */
 486                 if (inode->i_nlink > 1) {
 487                         if (inode->i_extracted_file) {
 488                                 DEBUG("Extracting hard link `%s' => `%s'",
 489                                       output_path, inode->i_extracted_file);
 490                                 if (link(inode->i_extracted_file, output_path) != 0) {
 491                                         ERROR_WITH_ERRNO("Failed to hard link "
 492                                                          "`%s' to `%s'",
 493                                                          output_path,
 494                                                          inode->i_extracted_file);
 495                                         return WIMLIB_ERR_LINK;
 496                                 }
 497                                 return 0;
 498                         }
 499                         FREE(inode->i_extracted_file);
 500                         inode->i_extracted_file = STRDUP(output_path);
 501                         if (!inode->i_extracted_file) {
 502                                 ERROR("Failed to allocate memory for filename");
 503                                 return WIMLIB_ERR_NOMEM;
 504                         }
 505                 }
 506         }
 507
 508         /* Extract the contents of the file to @output_path. */
 509
 510         out_fd = open(output_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 511         if (out_fd == -1) {
 512                 ERROR_WITH_ERRNO("Failed to open the file `%s' for writing",
 513                                  output_path);
 514                 return WIMLIB_ERR_OPEN;
 515         }
 516
 517         if (!lte) {
 518                 /* Empty file with no lookup table entry */
 519                 DEBUG("Empty file `%s'.", output_path);
 520                 ret = 0;
 521                 goto out_extract_unix_data;
 522         }
 523
 524         ret = extract_wim_resource_to_fd(lte, out_fd, wim_resource_size(lte));
 525         if (ret != 0) {
 526                 ERROR("Failed to extract resource to `%s'", output_path);
 527                 goto out;
 528         }
 529
 530 out_extract_unix_data:
 531         if (args->extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) {
 532                 struct wimlib_unix_data unix_data;
 533                 ret = inode_get_unix_data(inode, &unix_data, NULL);
 534                 if (ret > 0)
 535                         ;
 536                 else if (ret < 0)
 537                         ret = 0;
 538                 else
 539                         ret = fd_apply_unix_data(out_fd, &unix_data);
 540                 if (ret != 0)
 541                         goto out;
 542         }
 543         if (lte)
 544                 args->progress.extract.completed_bytes += wim_resource_size(lte);
 545 out:
 546         if (close(out_fd) != 0) {
 547                 ERROR_WITH_ERRNO("Failed to close file `%s'", output_path);
 548                 if (ret == 0)
 549                         ret = WIMLIB_ERR_WRITE;
 550         }
 551         return ret;
 552 }
 553
 554 static int extract_regular_file(struct wim_dentry *dentry,
 555                                 struct apply_args *args,
 556                                 const char *output_path)
 557 {
 558         struct wim_lookup_table_entry *lte;
 559         const struct wim_inode *inode = dentry->d_inode;
 560
 561         lte = inode_unnamed_lte_resolved(inode);
 562
 563         if (lte && (args->extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
 564                                            WIMLIB_EXTRACT_FLAG_HARDLINK)))
 565         {
 566                 if (lte->extracted_file) {
 567                         return extract_regular_file_linked(dentry, output_path, args, lte);
 568                 } else {
 569                         lte->extracted_file = STRDUP(output_path);
 570                         if (!lte->extracted_file)
 571                                 return WIMLIB_ERR_NOMEM;
 572                 }
 573         }
 574         return extract_regular_file_unlinked(dentry, args, output_path, lte);
 575 }
 576
 577 static int extract_symlink(struct wim_dentry *dentry,
 578                            struct apply_args *args,
 579                            const char *output_path)
 580 {
 581         char target[4096];
 582         ssize_t ret = inode_readlink(dentry->d_inode, target,
 583                                      sizeof(target), args->w, 0);
 584         struct wim_lookup_table_entry *lte;
 585
 586         if (ret <= 0) {
 587                 ERROR("Could not read the symbolic link from dentry `%s'",
 588                       dentry->full_path_utf8);
 589                 return WIMLIB_ERR_INVALID_DENTRY;
 590         }
 591         ret = symlink(target, output_path);
 592         if (ret != 0) {
 593                 ERROR_WITH_ERRNO("Failed to symlink `%s' to `%s'",
 594                                  output_path, target);
 595                 return WIMLIB_ERR_LINK;
 596         }
 597         lte = inode_unnamed_lte_resolved(dentry->d_inode);
 598         wimlib_assert(lte != NULL);
 599         if (args->extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) {
 600                 struct wimlib_unix_data unix_data;
 601                 ret = inode_get_unix_data(dentry->d_inode, &unix_data, NULL);
 602                 if (ret > 0)
 603                         ;
 604                 else if (ret < 0)
 605                         ret = 0;
 606                 else
 607                         ret = symlink_apply_unix_data(output_path, &unix_data);
 608                 if (ret != 0)
 609                         return ret;
 610         }
 611         args->progress.extract.completed_bytes += wim_resource_size(lte);
 612         return 0;
 613 }
 614
 615 #endif /* !(__CYGWIN__ || __WIN32__) */
 616
 617 static int extract_directory(struct wim_dentry *dentry,
 618                              const char *output_path, bool is_root)
 619 {
 620         int ret;
 621         struct stat stbuf;
 622
 623         ret = stat(output_path, &stbuf);
 624         if (ret == 0) {
 625                 if (S_ISDIR(stbuf.st_mode)) {
 626                         /*if (!is_root)*/
 627                                 /*WARNING("`%s' already exists", output_path);*/
 628                         goto dir_exists;
 629                 } else {
 630                         ERROR("`%s' is not a directory", output_path);
 631                         return WIMLIB_ERR_MKDIR;
 632                 }
 633         } else {
 634                 if (errno != ENOENT) {
 635                         ERROR_WITH_ERRNO("Failed to stat `%s'", output_path);
 636                         return WIMLIB_ERR_STAT;
 637                 }
 638         }
 639         if (mkdir(output_path, S_IRWXU | S_IRGRP | S_IXGRP |
 640                                S_IROTH | S_IXOTH) != 0) {
 641                 ERROR_WITH_ERRNO("Cannot create directory `%s'",
 642                                  output_path);
 643                 return WIMLIB_ERR_MKDIR;
 644         }
 645 dir_exists:
 646         ret = 0;
 647 #if !defined(__CYGWIN__) && !defined(__WIN32__)
 648         if (dentry) {
 649                 struct wimlib_unix_data unix_data;
 650                 ret = inode_get_unix_data(dentry->d_inode, &unix_data, NULL);
 651                 if (ret > 0)
 652                         ;
 653                 else if (ret < 0)
 654                         ret = 0;
 655                 else
 656                         ret = dir_apply_unix_data(output_path, &unix_data);
 657         }
 658 #endif
 659         return ret;
 660 }
 661
 662 /* Extracts a file, directory, or symbolic link from the WIM archive. */
 663 static int apply_dentry_normal(struct wim_dentry *dentry, void *arg)
 664 {
 665         struct apply_args *args = arg;
 666         struct wim_inode *inode = dentry->d_inode;
 667         size_t len;
 668         char *output_path;
 669
 670         len = strlen(args->target);
 671         if (dentry_is_root(dentry)) {
 672                 output_path = (char*)args->target;
 673         } else {
 674                 output_path = alloca(len + dentry->full_path_utf8_len + 1);
 675                 memcpy(output_path, args->target, len);
 676                 memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len);
 677                 output_path[len + dentry->full_path_utf8_len] = '\0';
 678                 len += dentry->full_path_utf8_len;
 679         }
 680
 681 #if defined(__CYGWIN__) || defined(__WIN32__)
 682         char *utf16_path;
 683         size_t utf16_path_len;
 684         DWORD err;
 685         int ret;
 686         ret = utf8_to_utf16(output_path, len, &utf16_path, &utf16_path_len);
 687         if (ret)
 688                 return ret;
 689
 690         if (inode->i_nlink > 1 && inode->i_extracted_file != NULL) {
 691                 /* Linked file, with another name already extracted.  Create a
 692                  * hard link. */
 693                 DEBUG("Creating hard link \"%ls => %ls\"",
 694                       (const wchar_t*)utf16_path,
 695                       (const wchar_t*)inode->i_extracted_file);
 696                 if (!CreateHardLinkW((const wchar_t*)utf16_path,
 697                                      (const wchar_t*)inode->i_extracted_file,
 698                                      NULL))
 699                 {
 700                         err = GetLastError();
 701                         ERROR("Can't create hard link \"%ls => %ls\"",
 702                               (const wchar_t*)utf16_path,
 703                               (const wchar_t*)inode->i_extracted_file);
 704                         ret = WIMLIB_ERR_LINK;
 705                         win32_error(err);
 706                 }
 707         } else {
 708                 /* Create the file, directory, or reparse point, and extract the
 709                  * data streams. */
 710                 ret = win32_extract_streams(inode, (const wchar_t*)utf16_path);
 711                 if (ret)
 712                         goto out_free_utf16_path;
 713
 714                 /* Set security descriptor if present */
 715                 if (inode->i_security_id != -1) {
 716                         DEBUG("Setting security descriptor %d on %s",
 717                               inode->i_security_id, output_path);
 718                         ret = win32_set_security_data(inode,
 719                                                       (const wchar_t*)utf16_path,
 720                                                       wim_const_security_data(args->w));
 721                         if (ret)
 722                                 goto out_free_utf16_path;
 723                 }
 724                 if (inode->i_nlink > 1) {
 725                         /* Save extracted path for a later call to
 726                          * CreateHardLinkW() if this inode has multiple links.
 727                          * */
 728                         inode->i_extracted_file = utf16_path;
 729                         goto out;
 730                 }
 731         }
 732 out_free_utf16_path:
 733         FREE(utf16_path);
 734 out:
 735         return ret;
 736 #else
 737         if (inode_is_symlink(inode))
 738                 return extract_symlink(dentry, args, output_path);
 739         else if (inode_is_directory(inode))
 740                 return extract_directory((args->extract_flags &
 741                                            WIMLIB_EXTRACT_FLAG_UNIX_DATA) ? dentry : NULL,
 742                                          output_path, false);
 743         else
 744                 return extract_regular_file(dentry, args, output_path);
 745 #endif
 746 }
 747
 748 /* Apply timestamps to an extracted file or directory */
 749 static int apply_dentry_timestamps_normal(struct wim_dentry *dentry, void *arg)
 750 {
 751         struct apply_args *args = arg;
 752         size_t len;
 753         char *output_path;
 754         int ret;
 755         const struct wim_inode *inode = dentry->d_inode;
 756
 757         len = strlen(args->target);
 758         if (dentry_is_root(dentry)) {
 759                 output_path = (char*)args->target;
 760         } else {
 761                 output_path = alloca(len + dentry->full_path_utf8_len + 1);
 762                 memcpy(output_path, args->target, len);
 763                 memcpy(output_path + len, dentry->full_path_utf8, dentry->full_path_utf8_len);
 764                 output_path[len + dentry->full_path_utf8_len] = '\0';
 765                 len += dentry->full_path_utf8_len;
 766         }
 767
 768 #if defined(__CYGWIN__) || defined(__WIN32__)
 769         /* Win32 */
 770         char *utf16_path;
 771         size_t utf16_path_len;
 772         DWORD err;
 773         HANDLE h;
 774         BOOL bret1, bret2;
 775
 776         ret = utf8_to_utf16(output_path, len, &utf16_path, &utf16_path_len);
 777         if (ret)
 778                 return ret;
 779
 780         DEBUG("Opening \"%ls\" to set timestamps", utf16_path);
 781         h = CreateFileW((const wchar_t*)utf16_path,
 782                         GENERIC_WRITE,
 783                         FILE_SHARE_READ,
 784                         NULL,
 785                         OPEN_EXISTING,
 786                         FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT,
 787                         NULL);
 788
 789         if (h == INVALID_HANDLE_VALUE)
 790                 err = GetLastError();
 791         FREE(utf16_path);
 792         if (h == INVALID_HANDLE_VALUE)
 793                 goto fail;
 794
 795         FILETIME creationTime = {.dwLowDateTime = dentry->d_inode->i_creation_time & 0xffffffff,
 796                                  .dwHighDateTime = dentry->d_inode->i_creation_time >> 32};
 797         FILETIME lastAccessTime = {.dwLowDateTime = dentry->d_inode->i_last_access_time & 0xffffffff,
 798                                   .dwHighDateTime = dentry->d_inode->i_last_access_time >> 32};
 799         FILETIME lastWriteTime = {.dwLowDateTime = dentry->d_inode->i_last_write_time & 0xffffffff,
 800                                   .dwHighDateTime = dentry->d_inode->i_last_write_time >> 32};
 801
 802         DEBUG("Calling SetFileTime() on \"%s\"", output_path);
 803         if (!SetFileTime(h, &creationTime, &lastAccessTime, &lastWriteTime)) {
 804                 err = GetLastError();
 805                 CloseHandle(h);
 806                 goto fail;
 807         }
 808         DEBUG("Closing \"%s\"", output_path);
 809         if (!CloseHandle(h)) {
 810                 err = GetLastError();
 811                 goto fail;
 812         }
 813         return 0;
 814 fail:
 815         ERROR("Can't set timestamps on \"%s\"", output_path);
 816         win32_error(err);
 817         return WIMLIB_ERR_WRITE;
 818 #else
 819         /* UNIX */
 820
 821         /* Convert the WIM timestamps, which are accurate to 100 nanoseconds,
 822          * into struct timeval's. */
 823         struct timeval tv[2];
 824         wim_timestamp_to_timeval(inode->i_last_access_time, &tv[0]);
 825         wim_timestamp_to_timeval(inode->i_last_write_time, &tv[1]);
 826         #ifdef HAVE_LUTIMES
 827         ret = lutimes(output_path, tv);
 828         #else
 829         ret = -1;
 830         errno = ENOSYS;
 831         #endif
 832         if (ret != 0) {
 833                 #ifdef HAVE_UTIME
 834                 if (errno == ENOSYS) {
 835                         struct utimbuf buf;
 836                         buf.actime = wim_timestamp_to_unix(inode->i_last_access_time);
 837                         buf.modtime = wim_timestamp_to_unix(inode->i_last_write_time);
 838                         if (utime(output_path, &buf) == 0)
 839                                 return 0;
 840                 }
 841                 #endif
 842                 if (errno != ENOSYS || args->num_lutimes_warnings < 10) {
 843                         /*WARNING_WITH_ERRNO("Failed to set timestamp on file `%s',*/
 844                                             /*output_path");*/
 845                         args->num_lutimes_warnings++;
 846                 }
 847         }
 848         return 0;
 849 #endif
 850 }
 851
 852 /* Extract a dentry if it hasn't already been extracted, and either the dentry
 853  * has no streams or WIMLIB_EXTRACT_FLAG_NO_STREAMS is not specified. */
 854 static int maybe_apply_dentry(struct wim_dentry *dentry, void *arg)
 855 {
 856         struct apply_args *args = arg;
 857         int ret;
 858
 859         if (dentry->is_extracted)
 860                 return 0;
 861
 862         if (args->extract_flags & WIMLIB_EXTRACT_FLAG_NO_STREAMS)
 863                 if (inode_unnamed_lte_resolved(dentry->d_inode))
 864                         return 0;
 865
 866         if ((args->extract_flags & WIMLIB_EXTRACT_FLAG_VERBOSE) &&
 867              args->progress_func) {
 868                 args->progress.extract.cur_path = dentry->full_path_utf8;
 869                 args->progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DENTRY,
 870                                     &args->progress);
 871         }
 872         ret = args->apply_dentry(dentry, args);
 873         if (ret == 0)
 874                 dentry->is_extracted = 1;
 875         return ret;
 876 }
 877
 878 static int cmp_streams_by_wim_position(const void *p1, const void *p2)
 879 {
 880         const struct wim_lookup_table_entry *lte1, *lte2;
 881         lte1 = *(const struct wim_lookup_table_entry**)p1;
 882         lte2 = *(const struct wim_lookup_table_entry**)p2;
 883         if (lte1->resource_entry.offset < lte2->resource_entry.offset)
 884                 return -1;
 885         else if (lte1->resource_entry.offset > lte2->resource_entry.offset)
 886                 return 1;
 887         else
 888                 return 0;
 889 }
 890
 891 static int sort_stream_list_by_wim_position(struct list_head *stream_list)
 892 {
 893         struct list_head *cur;
 894         size_t num_streams;
 895         struct wim_lookup_table_entry **array;
 896         size_t i;
 897         size_t array_size;
 898
 899         num_streams = 0;
 900         list_for_each(cur, stream_list)
 901                 num_streams++;
 902         array_size = num_streams * sizeof(array[0]);
 903         array = MALLOC(array_size);
 904         if (!array) {
 905                 ERROR("Failed to allocate %zu bytes to sort stream entries",
 906                       array_size);
 907                 return WIMLIB_ERR_NOMEM;
 908         }
 909         cur = stream_list->next;
 910         for (i = 0; i < num_streams; i++) {
 911                 array[i] = container_of(cur, struct wim_lookup_table_entry, staging_list);
 912                 cur = cur->next;
 913         }
 914
 915         qsort(array, num_streams, sizeof(array[0]), cmp_streams_by_wim_position);
 916
 917         INIT_LIST_HEAD(stream_list);
 918         for (i = 0; i < num_streams; i++)
 919                 list_add_tail(&array[i]->staging_list, stream_list);
 920         FREE(array);
 921         return 0;
 922 }
 923
 924 static void calculate_bytes_to_extract(struct list_head *stream_list,
 925                                        int extract_flags,
 926                                        union wimlib_progress_info *progress)
 927 {
 928         struct wim_lookup_table_entry *lte;
 929         u64 total_bytes = 0;
 930         u64 num_streams = 0;
 931
 932         /* For each stream to be extracted... */
 933         list_for_each_entry(lte, stream_list, staging_list) {
 934                 if (extract_flags &
 935                     (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
 936                 {
 937                         /* In the symlink or hard link extraction mode, each
 938                          * stream will be extracted one time regardless of how
 939                          * many dentries share the stream. */
 940                         wimlib_assert(!(extract_flags & WIMLIB_EXTRACT_FLAG_NTFS));
 941                         if (!lte->extracted_file) {
 942                                 num_streams++;
 943                                 total_bytes += wim_resource_size(lte);
 944                         }
 945                 } else {
 946                         num_streams += lte->out_refcnt;
 947                         total_bytes += lte->out_refcnt * wim_resource_size(lte);
 948                 }
 949         }
 950         progress->extract.num_streams = num_streams;
 951         progress->extract.total_bytes = total_bytes;
 952         progress->extract.completed_bytes = 0;
 953 }
 954
 955 static void maybe_add_stream_for_extraction(struct wim_lookup_table_entry *lte,
 956                                             struct list_head *stream_list)
 957 {
 958         if (++lte->out_refcnt == 1) {
 959                 INIT_LIST_HEAD(&lte->inode_list);
 960                 list_add_tail(&lte->staging_list, stream_list);
 961         }
 962 }
 963
 964 static void inode_find_streams_for_extraction(struct wim_inode *inode,
 965                                               struct list_head *stream_list,
 966                                               int extract_flags)
 967 {
 968         struct wim_lookup_table_entry *lte;
 969         bool inode_added = false;
 970
 971         lte = inode_unnamed_lte_resolved(inode);
 972         if (lte) {
 973                 maybe_add_stream_for_extraction(lte, stream_list);
 974                 list_add_tail(&inode->i_lte_inode_list, &lte->inode_list);
 975                 inode_added = true;
 976         }
 977 #ifdef WITH_NTFS_3G
 978         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
 979                 for (unsigned i = 0; i < inode->i_num_ads; i++) {
 980                         if (inode->i_ads_entries[i].stream_name_len != 0) {
 981                                 lte = inode->i_ads_entries[i].lte;
 982                                 if (lte) {
 983                                         maybe_add_stream_for_extraction(lte,
 984                                                                         stream_list);
 985                                         if (!inode_added) {
 986                                                 list_add_tail(&inode->i_lte_inode_list,
 987                                                               &lte->inode_list);
 988                                                 inode_added = true;
 989                                         }
 990                                 }
 991                         }
 992                 }
 993         }
 994 #endif
 995 }
 996
 997 static void find_streams_for_extraction(struct hlist_head *inode_list,
 998                                         struct list_head *stream_list,
 999                                         struct wim_lookup_table *lookup_table,
1000                                         int extract_flags)
1001 {
1002         struct wim_inode *inode;
1003         struct hlist_node *cur;
1004         struct wim_dentry *dentry;
1005
1006         for_lookup_table_entry(lookup_table, lte_zero_out_refcnt, NULL);
1007         INIT_LIST_HEAD(stream_list);
1008         hlist_for_each_entry(inode, cur, inode_list, i_hlist) {
1009                 if (!inode->i_resolved)
1010                         inode_resolve_ltes(inode, lookup_table);
1011                 inode_for_each_dentry(dentry, inode)
1012                         dentry->is_extracted = 0;
1013                 inode_find_streams_for_extraction(inode, stream_list,
1014                                                   extract_flags);
1015         }
1016 }
1017
1018 struct apply_operations {
1019         int (*apply_dentry)(struct wim_dentry *dentry, void *arg);
1020         int (*apply_dentry_timestamps)(struct wim_dentry *dentry, void *arg);
1021 };
1022
1023 static const struct apply_operations normal_apply_operations = {
1024         .apply_dentry = apply_dentry_normal,
1025         .apply_dentry_timestamps = apply_dentry_timestamps_normal,
1026 };
1027
1028 #ifdef WITH_NTFS_3G
1029 static const struct apply_operations ntfs_apply_operations = {
1030         .apply_dentry = apply_dentry_ntfs,
1031         .apply_dentry_timestamps = apply_dentry_timestamps_ntfs,
1032 };
1033 #endif
1034
1035 static int apply_stream_list(struct list_head *stream_list,
1036                              struct apply_args *args,
1037                              const struct apply_operations *ops,
1038                              wimlib_progress_func_t progress_func)
1039 {
1040         uint64_t bytes_per_progress = args->progress.extract.total_bytes / 100;
1041         uint64_t next_progress = bytes_per_progress;
1042         struct wim_lookup_table_entry *lte;
1043         struct wim_inode *inode;
1044         struct wim_dentry *dentry;
1045         int ret;
1046
1047         /* This complicated loop is essentially looping through the dentries,
1048          * although dentries may be visited more than once (if a dentry contains
1049          * two different nonempty streams) or not at all (if a dentry contains
1050          * no non-empty streams).
1051          *
1052          * The outer loop is over the distinct streams to be extracted so that
1053          * sequential reading of the WIM can be implemented. */
1054
1055         /* For each distinct stream to be extracted */
1056         list_for_each_entry(lte, stream_list, staging_list) {
1057                 /* For each inode that contains the stream */
1058                 list_for_each_entry(inode, &lte->inode_list, i_lte_inode_list) {
1059                         /* For each dentry that points to the inode */
1060                         inode_for_each_dentry(dentry, inode) {
1061                                 /* Extract the dentry if it was not already
1062                                  * extracted */
1063                                 ret = maybe_apply_dentry(dentry, args);
1064                                 if (ret != 0)
1065                                         return ret;
1066                                 if (progress_func &&
1067                                     args->progress.extract.completed_bytes >= next_progress)
1068                                 {
1069                                         progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_STREAMS,
1070                                                       &args->progress);
1071                                         if (args->progress.extract.completed_bytes >=
1072                                             args->progress.extract.total_bytes)
1073                                         {
1074                                                 next_progress = ~0ULL;
1075                                         } else {
1076                                                 next_progress =
1077                                                         min (args->progress.extract.completed_bytes +
1078                                                              bytes_per_progress,
1079                                                              args->progress.extract.total_bytes);
1080                                         }
1081                                 }
1082                         }
1083                 }
1084         }
1085         return 0;
1086 }
1087
1088 /* Extracts the image @image from the WIM @w to the directory or NTFS volume
1089  * @target. */
1090 static int extract_single_image(WIMStruct *w, int image,
1091                                 const char *target, int extract_flags,
1092                                 wimlib_progress_func_t progress_func)
1093 {
1094         int ret;
1095         struct list_head stream_list;
1096         struct hlist_head *inode_list;
1097
1098         struct apply_args args;
1099         const struct apply_operations *ops;
1100
1101         args.w                    = w;
1102         args.target               = target;
1103         args.extract_flags        = extract_flags;
1104         args.num_lutimes_warnings = 0;
1105         args.stream_list          = &stream_list;
1106         args.progress_func        = progress_func;
1107
1108         if (progress_func) {
1109                 args.progress.extract.wimfile_name = w->filename;
1110                 args.progress.extract.image = image;
1111                 args.progress.extract.extract_flags = (extract_flags &
1112                                                        WIMLIB_EXTRACT_MASK_PUBLIC);
1113                 args.progress.extract.image_name = wimlib_get_image_name(w, image);
1114                 args.progress.extract.target = target;
1115         }
1116
1117 #ifdef WITH_NTFS_3G
1118         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
1119                 args.vol = ntfs_mount(target, 0);
1120                 if (!args.vol) {
1121                         ERROR_WITH_ERRNO("Failed to mount NTFS volume `%s'", target);
1122                         return WIMLIB_ERR_NTFS_3G;
1123                 }
1124                 ops = &ntfs_apply_operations;
1125         } else
1126 #endif
1127                 ops = &normal_apply_operations;
1128
1129         ret = select_wim_image(w, image);
1130         if (ret != 0)
1131                 goto out;
1132
1133         inode_list = &w->image_metadata[image - 1].inode_list;
1134
1135         /* Build a list of the streams that need to be extracted */
1136         find_streams_for_extraction(inode_list, &stream_list,
1137                                     w->lookup_table, extract_flags);
1138
1139         /* Calculate the number of bytes of data that will be extracted */
1140         calculate_bytes_to_extract(&stream_list, extract_flags,
1141                                    &args.progress);
1142
1143         if (progress_func) {
1144                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_BEGIN,
1145                               &args.progress);
1146         }
1147
1148         /* If a sequential extraction was specified, sort the streams to be
1149          * extracted by their position in the WIM file, so that the WIM file can
1150          * be read sequentially. */
1151         if (extract_flags & WIMLIB_EXTRACT_FLAG_SEQUENTIAL) {
1152                 ret = sort_stream_list_by_wim_position(&stream_list);
1153                 if (ret != 0) {
1154                         WARNING("Falling back to non-sequential extraction");
1155                         extract_flags &= ~WIMLIB_EXTRACT_FLAG_SEQUENTIAL;
1156                 }
1157         }
1158
1159         if (progress_func) {
1160                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_BEGIN,
1161                               &args.progress);
1162         }
1163
1164         /* Make the directory structure and extract empty files */
1165         args.extract_flags |= WIMLIB_EXTRACT_FLAG_NO_STREAMS;
1166         args.apply_dentry = ops->apply_dentry;
1167         ret = for_dentry_in_tree(wim_root_dentry(w), maybe_apply_dentry, &args);
1168         args.extract_flags &= ~WIMLIB_EXTRACT_FLAG_NO_STREAMS;
1169         if (ret != 0)
1170                 goto out;
1171
1172         if (progress_func) {
1173                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_DIR_STRUCTURE_END,
1174                               &args.progress);
1175         }
1176
1177         /* Extract non-empty files */
1178         ret = apply_stream_list(&stream_list, &args, ops, progress_func);
1179         if (ret != 0)
1180                 goto out;
1181
1182         if (progress_func) {
1183                 progress_func(WIMLIB_PROGRESS_MSG_APPLY_TIMESTAMPS,
1184                               &args.progress);
1185         }
1186
1187         /* Apply timestamps */
1188         ret = for_dentry_in_tree_depth(wim_root_dentry(w),
1189                                        ops->apply_dentry_timestamps, &args);
1190         if (ret != 0)
1191                 goto out;
1192
1193         if (progress_func) {
1194                 progress_func(WIMLIB_PROGRESS_MSG_EXTRACT_IMAGE_END,
1195                               &args.progress);
1196         }
1197 out:
1198 #ifdef WITH_NTFS_3G
1199         /* Unmount the NTFS volume */
1200         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
1201                 if (ntfs_umount(args.vol, FALSE) != 0) {
1202                         ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%s'", args.target);
1203                         if (ret == 0)
1204                                 ret = WIMLIB_ERR_NTFS_3G;
1205                 }
1206         }
1207 #endif
1208         return ret;
1209 }
1210
1211
1212 /* Extracts all images from the WIM to the directory @target, with the images
1213  * placed in subdirectories named by their image names. */
1214 static int extract_all_images(WIMStruct *w, const char *target,
1215                               int extract_flags,
1216                               wimlib_progress_func_t progress_func)
1217 {
1218         size_t image_name_max_len = max(xml_get_max_image_name_len(w), 20);
1219         size_t output_path_len = strlen(target);
1220         char buf[output_path_len + 1 + image_name_max_len + 1];
1221         int ret;
1222         int image;
1223         const char *image_name;
1224
1225         ret = extract_directory(NULL, target, true);
1226         if (ret != 0)
1227                 return ret;
1228
1229         memcpy(buf, target, output_path_len);
1230         buf[output_path_len] = '/';
1231         for (image = 1; image <= w->hdr.image_count; image++) {
1232                 image_name = wimlib_get_image_name(w, image);
1233                 if (image_name && *image_name) {
1234                         strcpy(buf + output_path_len + 1, image_name);
1235                 } else {
1236                         /* Image name is empty. Use image number instead */
1237                         sprintf(buf + output_path_len + 1, "%d", image);
1238                 }
1239                 ret = extract_single_image(w, image, buf, extract_flags,
1240                                            progress_func);
1241                 if (ret != 0)
1242                         return ret;
1243         }
1244         return 0;
1245 }
1246
1247 /* Extracts a single image or all images from a WIM file to a directory or NTFS
1248  * volume. */
1249 WIMLIBAPI int wimlib_extract_image(WIMStruct *w,
1250                                    int image,
1251                                    const char *target,
1252                                    int extract_flags,
1253                                    WIMStruct **additional_swms,
1254                                    unsigned num_additional_swms,
1255                                    wimlib_progress_func_t progress_func)
1256 {
1257         struct wim_lookup_table *joined_tab, *w_tab_save;
1258         int ret;
1259
1260         if (!target)
1261                 return WIMLIB_ERR_INVALID_PARAM;
1262
1263         extract_flags &= WIMLIB_EXTRACT_MASK_PUBLIC;
1264
1265         if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
1266                         == (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))
1267                 return WIMLIB_ERR_INVALID_PARAM;
1268
1269 #if defined(__CYGWIN__) || defined(__WIN32__)
1270         if (extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) {
1271                 ERROR("Extracting UNIX data is not supported on Windows");
1272                 return WIMLIB_ERR_INVALID_PARAM;
1273         }
1274         if (extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK)) {
1275                 ERROR("Linked extraction modes are not supported on Windows");
1276                 return WIMLIB_ERR_INVALID_PARAM;
1277         }
1278 #endif
1279
1280         if (extract_flags & WIMLIB_EXTRACT_FLAG_NTFS) {
1281 #ifdef WITH_NTFS_3G
1282                 if ((extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK | WIMLIB_EXTRACT_FLAG_HARDLINK))) {
1283                         ERROR("Cannot specify symlink or hardlink flags when applying\n"
1284                               "        directly to a NTFS volume");
1285                         return WIMLIB_ERR_INVALID_PARAM;
1286                 }
1287                 if (image == WIMLIB_ALL_IMAGES) {
1288                         ERROR("Can only apply a single image when applying "
1289                               "directly to a NTFS volume");
1290                         return WIMLIB_ERR_INVALID_PARAM;
1291                 }
1292                 if (extract_flags & WIMLIB_EXTRACT_FLAG_UNIX_DATA) {
1293                         ERROR("Cannot restore UNIX-specific data in the NTFS extraction mode");
1294                         return WIMLIB_ERR_INVALID_PARAM;
1295                 }
1296 #else
1297                 ERROR("wimlib was compiled without support for NTFS-3g, so");
1298                 ERROR("we cannot apply a WIM image directly to a NTFS volume");
1299                 return WIMLIB_ERR_UNSUPPORTED;
1300 #endif
1301         }
1302
1303         ret = verify_swm_set(w, additional_swms, num_additional_swms);
1304         if (ret != 0)
1305                 return ret;
1306
1307         if (num_additional_swms) {
1308                 ret = new_joined_lookup_table(w, additional_swms,
1309                                               num_additional_swms, &joined_tab);
1310                 if (ret != 0)
1311                         return ret;
1312                 w_tab_save = w->lookup_table;
1313                 w->lookup_table = joined_tab;
1314         }
1315
1316         if (image == WIMLIB_ALL_IMAGES) {
1317                 extract_flags |= WIMLIB_EXTRACT_FLAG_MULTI_IMAGE;
1318                 ret = extract_all_images(w, target, extract_flags,
1319                                          progress_func);
1320         } else {
1321                 extract_flags &= ~WIMLIB_EXTRACT_FLAG_MULTI_IMAGE;
1322                 ret = extract_single_image(w, image, target, extract_flags,
1323                                            progress_func);
1324         }
1325
1326         if (extract_flags & (WIMLIB_EXTRACT_FLAG_SYMLINK |
1327                              WIMLIB_EXTRACT_FLAG_HARDLINK))
1328         {
1329                 for_lookup_table_entry(w->lookup_table,
1330                                        lte_free_extracted_file,
1331                                        NULL);
1332         }
1333
1334         if (num_additional_swms) {
1335                 free_lookup_table(w->lookup_table);
1336                 w->lookup_table = w_tab_save;
1337         }
1338         return ret;
1339 }