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   1 /*
   2  * win32.c
   3  *
   4  * All the library code specific to native Windows builds is in here.
   5  */
   6
   7 /*
   8  * Copyright (C) 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 #ifndef __WIN32__
  27 #  error "This file contains Windows code"
  28 #endif
  29
  30 #include "config.h"
  31 #include <windows.h>
  32 #include <ntdef.h>
  33 #include <wchar.h>
  34 #include <shlwapi.h> /* shlwapi.h for PathMatchSpecA() */
  35 #ifdef ERROR /* windows.h defines this */
  36 #  undef ERROR
  37 #endif
  38
  39 #include "win32.h"
  40 #include "dentry.h"
  41 #include "lookup_table.h"
  42 #include "security.h"
  43 #include "endianness.h"
  44
  45 #include <errno.h>
  46
  47
  48
  49 /* Pointers to functions that are not available on all targetted versions of
  50  * Windows (XP and later).  NOTE: The WINAPI annotations seem to be important; I
  51  * assume it specifies a certain calling convention. */
  52
  53 /* Vista and later */
  54 static HANDLE (WINAPI *win32func_FindFirstStreamW)(LPCWSTR lpFileName,
  55                                             STREAM_INFO_LEVELS InfoLevel,
  56                                             LPVOID lpFindStreamData,
  57                                             DWORD dwFlags) = NULL;
  58
  59 /* Vista and later */
  60 static BOOL (WINAPI *win32func_FindNextStreamW)(HANDLE hFindStream,
  61                                          LPVOID lpFindStreamData) = NULL;
  62
  63 /* Try to dynamically load some functions */
  64 void
  65 win32_global_init()
  66 {
  67         DWORD err;
  68         bool warned;
  69
  70         DEBUG("Loading Kernel32.dll");
  71
  72         HMODULE lib = LoadLibraryA("Kernel32.dll");
  73         if (lib == NULL) {
  74                 err = GetLastError();
  75                 WARNING("Can't load Kernel32.dll");
  76                 win32_error(err);
  77                 return;
  78         }
  79
  80         DEBUG("Looking for FindFirstStreamW");
  81         win32func_FindFirstStreamW = (void*)GetProcAddress(lib, "FindFirstStreamW");
  82         if (!win32func_FindFirstStreamW) {
  83                 WARNING("Could not find function FindFirstStreamW() in Kernel32.dll!");
  84                 WARNING("Capturing alternate data streams will not be supported.");
  85                 goto out_free_lib;
  86         }
  87
  88         DEBUG("Looking for FindNextStreamW");
  89         win32func_FindNextStreamW = (void*)GetProcAddress(lib, "FindNextStreamW");
  90         if (!win32func_FindNextStreamW) {
  91                 WARNING("Could not find function FindNextStreamW() in Kernel32.dll!");
  92                 WARNING("Capturing alternate data streams will not be supported.");
  93                 win32func_FindFirstStreamW = NULL;
  94         }
  95 out_free_lib:
  96         DEBUG("Closing Kernel32.dll");
  97         FreeLibrary(lib);
  98 }
  99
 100 static const char *access_denied_msg =
 101 "         If you are not running this program as the administrator, you may\n"
 102 "         need to do so, so that all data and metadata can be backed up.\n"
 103 "         Otherwise, there may be no way to access the desired data or\n"
 104 "         metadata without taking ownership of the file or directory.\n";
 105
 106 #ifdef ENABLE_ERROR_MESSAGES
 107 void
 108 win32_error(u32 err_code)
 109 {
 110         char *buffer;
 111         DWORD nchars;
 112         nchars = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
 113                                 NULL, err_code, 0,
 114                                 (char*)&buffer, 0, NULL);
 115         if (nchars == 0) {
 116                 ERROR("Error printing error message! "
 117                       "Computer will self-destruct in 3 seconds.");
 118         } else {
 119                 ERROR("Win32 error: %s", buffer);
 120                 LocalFree(buffer);
 121         }
 122 }
 123
 124 void
 125 win32_error_last()
 126 {
 127         win32_error(GetLastError());
 128 }
 129 #endif
 130
 131 static HANDLE
 132 win32_open_existing_file(const wchar_t *path, DWORD dwDesiredAccess)
 133 {
 134         return CreateFileW(path,
 135                            dwDesiredAccess,
 136                            FILE_SHARE_READ,
 137                            NULL, /* lpSecurityAttributes */
 138                            OPEN_EXISTING,
 139                            FILE_FLAG_BACKUP_SEMANTICS |
 140                                FILE_FLAG_OPEN_REPARSE_POINT,
 141                            NULL /* hTemplateFile */);
 142 }
 143
 144 HANDLE
 145 win32_open_file_data_only(const wchar_t *path)
 146 {
 147         return win32_open_existing_file(path, FILE_READ_DATA);
 148 }
 149
 150 int
 151 win32_read_file(const mbchar *filename,
 152                 void *handle, u64 offset, size_t size, void *buf)
 153 {
 154         HANDLE h = handle;
 155         DWORD err;
 156         DWORD bytesRead;
 157         LARGE_INTEGER liOffset = {.QuadPart = offset};
 158
 159         wimlib_assert(size <= 0xffffffff);
 160
 161         if (SetFilePointerEx(h, liOffset, NULL, FILE_BEGIN))
 162                 if (ReadFile(h, buf, size, &bytesRead, NULL) && bytesRead == size)
 163                         return 0;
 164         err = GetLastError();
 165         ERROR("Error reading \"%s\"", filename);
 166         win32_error(err);
 167         return WIMLIB_ERR_READ;
 168 }
 169
 170 void
 171 win32_close_file(void *handle)
 172 {
 173         CloseHandle((HANDLE)handle);
 174 }
 175
 176 static u64
 177 FILETIME_to_u64(const FILETIME *ft)
 178 {
 179         return ((u64)ft->dwHighDateTime << 32) | (u64)ft->dwLowDateTime;
 180 }
 181
 182 static int
 183 win32_get_short_name(struct wim_dentry *dentry,
 184                      const wchar_t *path_utf16)
 185 {
 186         WIN32_FIND_DATAW dat;
 187         if (FindFirstFileW(path_utf16, &dat) &&
 188             dat.cAlternateFileName[0] != L'\0')
 189         {
 190                 size_t short_name_nbytes = wcslen(dat.cAlternateFileName) * 2;
 191                 size_t n = short_name_nbytes + sizeof(wchar_t);
 192                 dentry->short_name = MALLOC(n);
 193                 if (!dentry->short_name)
 194                         return WIMLIB_ERR_NOMEM;
 195                 memcpy(dentry->short_name, dat.cAlternateFileName, n);
 196                 dentry->short_name_nbytes = short_name_nbytes;
 197         }
 198         return 0;
 199 }
 200
 201 static int
 202 win32_get_security_descriptor(struct wim_dentry *dentry,
 203                               struct sd_set *sd_set,
 204                               const wchar_t *path_utf16)
 205 {
 206         SECURITY_INFORMATION requestedInformation;
 207         DWORD lenNeeded = 0;
 208         BOOL status;
 209         DWORD err;
 210
 211         requestedInformation = DACL_SECURITY_INFORMATION |
 212                                SACL_SECURITY_INFORMATION |
 213                                OWNER_SECURITY_INFORMATION |
 214                                GROUP_SECURITY_INFORMATION;
 215         /* Request length of security descriptor */
 216         status = GetFileSecurityW(path_utf16, requestedInformation,
 217                                   NULL, 0, &lenNeeded);
 218         err = GetLastError();
 219         if (!status && err == ERROR_INSUFFICIENT_BUFFER) {
 220                 DWORD len = lenNeeded;
 221                 char buf[len];
 222                 if (GetFileSecurityW(path_utf16, requestedInformation,
 223                                      (PSECURITY_DESCRIPTOR)buf, len, &lenNeeded))
 224                 {
 225                         int security_id = sd_set_add_sd(sd_set, buf, len);
 226                         if (security_id < 0)
 227                                 return WIMLIB_ERR_NOMEM;
 228                         else {
 229                                 dentry->d_inode->i_security_id = security_id;
 230                                 return 0;
 231                         }
 232                 } else {
 233                         err = GetLastError();
 234                 }
 235         }
 236
 237         if (err == ERROR_ACCESS_DENIED) {
 238                 WARNING("Failed to read security descriptor of \"%ls\": "
 239                         "Access denied!\n%s", path_utf16, access_denied_msg);
 240                 return 0;
 241         } else {
 242                 ERROR("Win32 API: Failed to read security descriptor of \"%ls\"",
 243                       path_utf16);
 244                 win32_error(err);
 245                 return WIMLIB_ERR_READ;
 246         }
 247 }
 248
 249 /* Reads the directory entries of directory using a Win32 API and recursively
 250  * calls win32_build_dentry_tree() on them. */
 251 static int
 252 win32_recurse_directory(struct wim_dentry *root,
 253                         const mbchar *root_disk_path,
 254                         struct wim_lookup_table *lookup_table,
 255                         struct wim_security_data *sd,
 256                         const struct capture_config *config,
 257                         int add_image_flags,
 258                         wimlib_progress_func_t progress_func,
 259                         struct sd_set *sd_set,
 260                         const wchar_t *path_utf16,
 261                         size_t path_utf16_nchars)
 262 {
 263         WIN32_FIND_DATAW dat;
 264         HANDLE hFind;
 265         DWORD err;
 266         int ret;
 267
 268         {
 269                 /* Begin reading the directory by calling FindFirstFileW.
 270                  * Unlike UNIX opendir(), FindFirstFileW has file globbing built
 271                  * into it.  But this isn't what we actually want, so just add a
 272                  * dummy glob to get all entries. */
 273                 wchar_t pattern_buf[path_utf16_nchars + 3];
 274                 memcpy(pattern_buf, path_utf16,
 275                        path_utf16_nchars * sizeof(wchar_t));
 276                 pattern_buf[path_utf16_nchars] = L'/';
 277                 pattern_buf[path_utf16_nchars + 1] = L'*';
 278                 pattern_buf[path_utf16_nchars + 2] = L'\0';
 279                 hFind = FindFirstFileW(pattern_buf, &dat);
 280         }
 281         if (hFind == INVALID_HANDLE_VALUE) {
 282                 err = GetLastError();
 283                 if (err == ERROR_FILE_NOT_FOUND) {
 284                         return 0;
 285                 } else {
 286                         ERROR("Win32 API: Failed to read directory \"%s\"",
 287                               root_disk_path);
 288                         win32_error(err);
 289                         return WIMLIB_ERR_READ;
 290                 }
 291         }
 292         ret = 0;
 293         do {
 294                 /* Skip . and .. entries */
 295                 if (!(dat.cFileName[0] == cpu_to_le16(L'.') &&
 296                       (dat.cFileName[1] == cpu_to_le16(L'\0') ||
 297                        (dat.cFileName[1] == cpu_to_le16(L'.') &&
 298                         dat.cFileName[2] == cpu_to_le16(L'\0')))))
 299                 {
 300                         struct wim_dentry *child;
 301
 302                         mbchar *mbs_name;
 303                         size_t mbs_name_nbytes;
 304                         ret = utf16le_to_mbs(dat.cFileName,
 305                                              wcslen(dat.cFileName) * sizeof(wchar_t),
 306                                              &mbs_name,
 307                                              &mbs_name_nbytes);
 308                         if (ret)
 309                                 goto out_find_close;
 310
 311                         mbchar name[strlen(root_disk_path) + 1 + mbs_name_nbytes + 1];
 312                         sprintf(name, "%s/%s", root_disk_path, mbs_name);
 313                         FREE(mbs_name);
 314                         ret = win32_build_dentry_tree(&child, name, lookup_table,
 315                                                       sd, config, add_image_flags,
 316                                                       progress_func, sd_set);
 317                         if (ret)
 318                                 goto out_find_close;
 319                         if (child)
 320                                 dentry_add_child(root, child);
 321                 }
 322         } while (FindNextFileW(hFind, &dat));
 323         err = GetLastError();
 324         if (err != ERROR_NO_MORE_FILES) {
 325                 ERROR("Win32 API: Failed to read directory \"%s\"", root_disk_path);
 326                 win32_error(err);
 327                 if (ret == 0)
 328                         ret = WIMLIB_ERR_READ;
 329         }
 330 out_find_close:
 331         FindClose(hFind);
 332         return ret;
 333 }
 334
 335 /* Load a reparse point into a WIM inode.  It is just stored in memory.
 336  *
 337  * @hFile:  Open handle to a reparse point, with permission to read the reparse
 338  *          data.
 339  *
 340  * @inode:  WIM inode for the reparse point.
 341  *
 342  * @lookup_table:  Stream lookup table for the WIM; an entry will be added to it
 343  *                 for the reparse point unless an entry already exists for
 344  *                 the exact same data stream.
 345  *
 346  * @path:  External path to the reparse point.  Used for error messages only.
 347  *
 348  * Returns 0 on success; nonzero on failure. */
 349 static int
 350 win32_capture_reparse_point(HANDLE hFile,
 351                             struct wim_inode *inode,
 352                             struct wim_lookup_table *lookup_table,
 353                             const mbchar *path)
 354 {
 355         /* "Reparse point data, including the tag and optional GUID,
 356          * cannot exceed 16 kilobytes." - MSDN  */
 357         char reparse_point_buf[16 * 1024];
 358         DWORD bytesReturned;
 359
 360         if (!DeviceIoControl(hFile, FSCTL_GET_REPARSE_POINT,
 361                              NULL, /* "Not used with this operation; set to NULL" */
 362                              0, /* "Not used with this operation; set to 0" */
 363                              reparse_point_buf, /* "A pointer to a buffer that
 364                                                    receives the reparse point data */
 365                              sizeof(reparse_point_buf), /* "The size of the output
 366                                                            buffer, in bytes */
 367                              &bytesReturned,
 368                              NULL))
 369         {
 370                 DWORD err = GetLastError();
 371                 ERROR("Win32 API: Failed to get reparse data of \"%s\"", path);
 372                 win32_error(err);
 373                 return WIMLIB_ERR_READ;
 374         }
 375         if (bytesReturned < 8) {
 376                 ERROR("Reparse data on \"%s\" is invalid", path);
 377                 return WIMLIB_ERR_READ;
 378         }
 379         inode->i_reparse_tag = le32_to_cpu(*(u32*)reparse_point_buf);
 380         return inode_add_ads_with_data(inode, "",
 381                                        reparse_point_buf + 8,
 382                                        bytesReturned - 8, lookup_table);
 383 }
 384
 385 /* Calculate the SHA1 message digest of a Win32 data stream, which may be either
 386  * an unnamed or named data stream.
 387  *
 388  * @path:       Path to the file, with the stream noted at the end for named
 389  *              streams.  UTF-16LE encoding.
 390  *
 391  * @hash:       On success, the SHA1 message digest of the stream is written to
 392  *              this location.
 393  *
 394  * Returns 0 on success; nonzero on failure.
 395  */
 396 static int
 397 win32_sha1sum(const wchar_t *path, u8 hash[SHA1_HASH_SIZE])
 398 {
 399         HANDLE hFile;
 400         SHA_CTX ctx;
 401         u8 buf[32768];
 402         DWORD bytesRead;
 403         int ret;
 404
 405         hFile = win32_open_file_data_only(path);
 406         if (hFile == INVALID_HANDLE_VALUE)
 407                 return WIMLIB_ERR_OPEN;
 408
 409         sha1_init(&ctx);
 410         for (;;) {
 411                 if (!ReadFile(hFile, buf, sizeof(buf), &bytesRead, NULL)) {
 412                         ret = WIMLIB_ERR_READ;
 413                         goto out_close_handle;
 414                 }
 415                 if (bytesRead == 0)
 416                         break;
 417                 sha1_update(&ctx, buf, bytesRead);
 418         }
 419         ret = 0;
 420         sha1_final(hash, &ctx);
 421 out_close_handle:
 422         CloseHandle(hFile);
 423         return ret;
 424 }
 425
 426 /* Scans an unnamed or named stream of a Win32 file (not a reparse point
 427  * stream); calculates its SHA1 message digest and either creates a `struct
 428  * wim_lookup_table_entry' in memory for it, or uses an existing 'struct
 429  * wim_lookup_table_entry' for an identical stream.
 430  *
 431  * @path_utf16:         Path to the file (UTF-16LE).
 432  *
 433  * @path_utf16_nchars:  Number of 2-byte characters in @path_utf16.
 434  *
 435  * @inode:              WIM inode to save the stream into.
 436  *
 437  * @lookup_table:       Stream lookup table for the WIM.
 438  *
 439  * @dat:                A `WIN32_FIND_STREAM_DATA' structure that specifies the
 440  *                      stream name.
 441  *
 442  * Returns 0 on success; nonzero on failure.
 443  */
 444 static int
 445 win32_capture_stream(const wchar_t *path_utf16,
 446                      size_t path_utf16_nchars,
 447                      struct wim_inode *inode,
 448                      struct wim_lookup_table *lookup_table,
 449                      WIN32_FIND_STREAM_DATA *dat)
 450 {
 451         struct wim_ads_entry *ads_entry;
 452         u8 hash[SHA1_HASH_SIZE];
 453         struct wim_lookup_table_entry *lte;
 454         int ret;
 455         wchar_t *stream_name, *colon;
 456         size_t stream_name_nchars;
 457         bool is_named_stream;
 458         wchar_t *spath;
 459         size_t spath_nchars;
 460         DWORD err;
 461         size_t spath_buf_nbytes;
 462         const wchar_t *relpath_prefix;
 463         const wchar_t *colonchar;
 464
 465         /* The stream name should be returned as :NAME:TYPE */
 466         stream_name = dat->cStreamName;
 467         if (*stream_name != L':')
 468                 goto out_invalid_stream_name;
 469         stream_name += 1;
 470         colon = wcschr(stream_name, L':');
 471         if (colon == NULL)
 472                 goto out_invalid_stream_name;
 473
 474         if (wcscmp(colon + 1, L"$DATA")) {
 475                 /* Not a DATA stream */
 476                 ret = 0;
 477                 goto out;
 478         }
 479
 480         *colon = '\0';
 481
 482         stream_name_nchars = colon - stream_name;
 483         is_named_stream = (stream_name_nchars != 0);
 484
 485         if (is_named_stream) {
 486                 /* Allocate an ADS entry for the named stream. */
 487                 ads_entry = inode_add_ads_utf16le(inode, stream_name,
 488                                                   stream_name_nchars * 2);
 489                 if (!ads_entry) {
 490                         ret = WIMLIB_ERR_NOMEM;
 491                         goto out;
 492                 }
 493         }
 494
 495         /* Create a UTF-16LE string @spath that gives the filename, then a
 496          * colon, then the stream name.  Or, if it's an unnamed stream, just the
 497          * filename.  It is MALLOC()'ed so that it can be saved in the
 498          * wim_lookup_table_entry if needed.
 499          *
 500          * As yet another special case, relative paths need to be changed to
 501          * begin with an explicit "./" so that, for example, a file t:ads, where
 502          * :ads is the part we added, is not interpreted as a file on the t:
 503          * drive. */
 504         spath_nchars = path_utf16_nchars;
 505         relpath_prefix = L"";
 506         colonchar = L"";
 507         if (is_named_stream) {
 508                 spath_nchars += 1 + stream_name_nchars;
 509                 colonchar = L":";
 510                 if (path_utf16_nchars == 1 &&
 511                     path_utf16[0] != cpu_to_le16('/') &&
 512                     path_utf16[0] != cpu_to_le16('\\'))
 513                 {
 514                         spath_nchars += 2;
 515                         relpath_prefix = L"./";
 516                 }
 517         }
 518
 519         spath_buf_nbytes = (spath_nchars + 1) * sizeof(wchar_t);
 520         spath = MALLOC(spath_buf_nbytes);
 521
 522         swprintf(spath, spath_buf_nbytes, L"%ls%ls%ls%ls",
 523                  relpath_prefix, path_utf16, colonchar, stream_name);
 524
 525         ret = win32_sha1sum(spath, hash);
 526         if (ret) {
 527                 err = GetLastError();
 528                 ERROR("Win32 API: Failed to read \"%ls\" to calculate SHA1sum",
 529                       spath);
 530                 win32_error(err);
 531                 goto out_free_spath;
 532         }
 533
 534         lte = __lookup_resource(lookup_table, hash);
 535         if (lte) {
 536                 /* Use existing wim_lookup_table_entry that has the same SHA1
 537                  * message digest */
 538                 lte->refcnt++;
 539         } else {
 540                 /* Make a new wim_lookup_table_entry */
 541                 lte = new_lookup_table_entry();
 542                 if (!lte) {
 543                         ret = WIMLIB_ERR_NOMEM;
 544                         goto out_free_spath;
 545                 }
 546                 lte->win32_file_on_disk = spath;
 547                 lte->file_on_disk_fp = INVALID_HANDLE_VALUE;
 548                 spath = NULL;
 549                 lte->resource_location = RESOURCE_WIN32;
 550                 lte->resource_entry.original_size = (uint64_t)dat->StreamSize.QuadPart;
 551                 lte->resource_entry.size = (uint64_t)dat->StreamSize.QuadPart;
 552                 copy_hash(lte->hash, hash);
 553                 lookup_table_insert(lookup_table, lte);
 554         }
 555         if (is_named_stream)
 556                 ads_entry->lte = lte;
 557         else
 558                 inode->i_lte = lte;
 559 out_free_spath:
 560         FREE(spath);
 561 out:
 562         return ret;
 563 out_invalid_stream_name:
 564         ERROR("Invalid stream name: \"%ls:%ls\"", path_utf16, dat->cStreamName);
 565         ret = WIMLIB_ERR_READ;
 566         goto out;
 567 }
 568
 569 /* Scans a Win32 file for unnamed and named data streams (not reparse point
 570  * streams).
 571  *
 572  * @path_utf16:         Path to the file (UTF-16LE).
 573  *
 574  * @path_utf16_nchars:  Number of 2-byte characters in @path_utf16.
 575  *
 576  * @inode:              WIM inode to save the stream into.
 577  *
 578  * @lookup_table:       Stream lookup table for the WIM.
 579  *
 580  * @file_size:          Size of unnamed data stream.  (Used only if alternate
 581  *                      data streams API appears to be unavailable.)
 582  *
 583  * Returns 0 on success; nonzero on failure.
 584  */
 585 static int
 586 win32_capture_streams(const wchar_t *path_utf16,
 587                       size_t path_utf16_nchars,
 588                       struct wim_inode *inode,
 589                       struct wim_lookup_table *lookup_table,
 590                       u64 file_size)
 591 {
 592         WIN32_FIND_STREAM_DATA dat;
 593         int ret;
 594         HANDLE hFind;
 595         DWORD err;
 596
 597         if (win32func_FindFirstStreamW == NULL)
 598                 goto unnamed_only;
 599
 600         hFind = win32func_FindFirstStreamW(path_utf16, FindStreamInfoStandard, &dat, 0);
 601         if (hFind == INVALID_HANDLE_VALUE) {
 602                 err = GetLastError();
 603
 604                 if (err == ERROR_CALL_NOT_IMPLEMENTED)
 605                         goto unnamed_only;
 606
 607                 /* Seems legal for this to return ERROR_HANDLE_EOF on reparse
 608                  * points and directories */
 609                 if ((inode->i_attributes &
 610                     (FILE_ATTRIBUTE_REPARSE_POINT | FILE_ATTRIBUTE_DIRECTORY))
 611                     && err == ERROR_HANDLE_EOF)
 612                 {
 613                         return 0;
 614                 } else {
 615                         if (err == ERROR_ACCESS_DENIED) {
 616                                 WARNING("Failed to look up data streams of \"%ls\": "
 617                                         "Access denied!\n%s", path_utf16,
 618                                         access_denied_msg);
 619                                 return 0;
 620                         } else {
 621                                 ERROR("Win32 API: Failed to look up data streams of \"%ls\"",
 622                                       path_utf16);
 623                                 win32_error(err);
 624                                 return WIMLIB_ERR_READ;
 625                         }
 626                 }
 627         }
 628         do {
 629                 ret = win32_capture_stream(path_utf16,
 630                                            path_utf16_nchars,
 631                                            inode, lookup_table,
 632                                            &dat);
 633                 if (ret)
 634                         goto out_find_close;
 635         } while (win32func_FindNextStreamW(hFind, &dat));
 636         err = GetLastError();
 637         if (err != ERROR_HANDLE_EOF) {
 638                 ERROR("Win32 API: Error reading data streams from \"%ls\"", path_utf16);
 639                 win32_error(err);
 640                 ret = WIMLIB_ERR_READ;
 641         }
 642 out_find_close:
 643         FindClose(hFind);
 644         return ret;
 645 unnamed_only:
 646         if (inode->i_attributes &
 647              (FILE_ATTRIBUTE_REPARSE_POINT | FILE_ATTRIBUTE_DIRECTORY))
 648         {
 649                 ret = 0;
 650         } else {
 651                 wcscpy(dat.cStreamName, L"::$DATA");
 652                 dat.StreamSize.QuadPart = file_size;
 653                 ret = win32_capture_stream(path_utf16,
 654                                            path_utf16_nchars,
 655                                            inode, lookup_table,
 656                                            &dat);
 657         }
 658         return ret;
 659 }
 660
 661 /* Win32 version of capturing a directory tree */
 662 int
 663 win32_build_dentry_tree(struct wim_dentry **root_ret,
 664                         const mbchar *root_disk_path,
 665                         struct wim_lookup_table *lookup_table,
 666                         struct wim_security_data *sd,
 667                         const struct capture_config *config,
 668                         int add_image_flags,
 669                         wimlib_progress_func_t progress_func,
 670                         void *extra_arg)
 671 {
 672         struct wim_dentry *root = NULL;
 673         int ret = 0;
 674         struct wim_inode *inode;
 675
 676         wchar_t *path_utf16;
 677         size_t path_utf16_nbytes;
 678         size_t path_utf16_nchars;
 679         struct sd_set *sd_set;
 680         DWORD err;
 681         u64 file_size;
 682
 683         if (exclude_path(root_disk_path, config, true)) {
 684                 if (add_image_flags & WIMLIB_ADD_IMAGE_FLAG_ROOT) {
 685                         ERROR("Cannot exclude the root directory from capture");
 686                         ret = WIMLIB_ERR_INVALID_CAPTURE_CONFIG;
 687                         goto out;
 688                 }
 689                 if ((add_image_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 690                     && progress_func)
 691                 {
 692                         union wimlib_progress_info info;
 693                         info.scan.cur_path = root_disk_path;
 694                         info.scan.excluded = true;
 695                         progress_func(WIMLIB_PROGRESS_MSG_SCAN_DENTRY, &info);
 696                 }
 697                 goto out;
 698         }
 699
 700         if ((add_image_flags & WIMLIB_ADD_IMAGE_FLAG_VERBOSE)
 701             && progress_func)
 702         {
 703                 union wimlib_progress_info info;
 704                 info.scan.cur_path = root_disk_path;
 705                 info.scan.excluded = false;
 706                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_DENTRY, &info);
 707         }
 708
 709         if (extra_arg == NULL) {
 710                 sd_set = alloca(sizeof(struct sd_set));
 711                 sd_set->rb_root.rb_node = NULL,
 712                 sd_set->sd = sd;
 713         } else {
 714                 sd_set = extra_arg;
 715         }
 716
 717         ret = mbs_to_utf16le(root_disk_path, strlen(root_disk_path),
 718                              &path_utf16, &path_utf16_nbytes);
 719         if (ret)
 720                 goto out_destroy_sd_set;
 721         path_utf16_nchars = path_utf16_nbytes / sizeof(wchar_t);
 722
 723         HANDLE hFile = win32_open_existing_file(path_utf16,
 724                                                 FILE_READ_DATA | FILE_READ_ATTRIBUTES);
 725         if (hFile == INVALID_HANDLE_VALUE) {
 726                 err = GetLastError();
 727                 ERROR("Win32 API: Failed to open \"%s\"", root_disk_path);
 728                 win32_error(err);
 729                 ret = WIMLIB_ERR_OPEN;
 730                 goto out_free_path_utf16;
 731         }
 732
 733         BY_HANDLE_FILE_INFORMATION file_info;
 734         if (!GetFileInformationByHandle(hFile, &file_info)) {
 735                 err = GetLastError();
 736                 ERROR("Win32 API: Failed to get file information for \"%s\"",
 737                       root_disk_path);
 738                 win32_error(err);
 739                 ret = WIMLIB_ERR_STAT;
 740                 goto out_close_handle;
 741         }
 742
 743         /* Create a WIM dentry */
 744         ret = new_dentry_with_timeless_inode(path_basename(root_disk_path), &root);
 745         if (ret)
 746                 goto out_close_handle;
 747
 748         /* Start preparing the associated WIM inode */
 749         inode = root->d_inode;
 750
 751         inode->i_attributes = file_info.dwFileAttributes;
 752         inode->i_creation_time = FILETIME_to_u64(&file_info.ftCreationTime);
 753         inode->i_last_write_time = FILETIME_to_u64(&file_info.ftLastWriteTime);
 754         inode->i_last_access_time = FILETIME_to_u64(&file_info.ftLastAccessTime);
 755         inode->i_ino = ((u64)file_info.nFileIndexHigh << 32) |
 756                         (u64)file_info.nFileIndexLow;
 757
 758         inode->i_resolved = 1;
 759         add_image_flags &= ~(WIMLIB_ADD_IMAGE_FLAG_ROOT | WIMLIB_ADD_IMAGE_FLAG_SOURCE);
 760
 761         /* Get DOS name and security descriptor (if any). */
 762         ret = win32_get_short_name(root, path_utf16);
 763         if (ret)
 764                 goto out_close_handle;
 765
 766         if (!(add_image_flags & WIMLIB_ADD_IMAGE_FLAG_NO_ACLS)) {
 767                 ret = win32_get_security_descriptor(root, sd_set, path_utf16);
 768                 if (ret)
 769                         goto out_close_handle;
 770         }
 771
 772         file_size = ((u64)file_info.nFileSizeHigh << 32) |
 773                      (u64)file_info.nFileSizeLow;
 774
 775         if (inode_is_directory(inode)) {
 776                 /* Directory (not a reparse point) --- recurse to children */
 777
 778                 /* But first... directories may have alternate data streams that
 779                  * need to be captured. */
 780                 ret = win32_capture_streams(path_utf16,
 781                                             path_utf16_nchars,
 782                                             inode,
 783                                             lookup_table,
 784                                             file_size);
 785                 if (ret)
 786                         goto out_close_handle;
 787                 ret = win32_recurse_directory(root,
 788                                               root_disk_path,
 789                                               lookup_table,
 790                                               sd,
 791                                               config,
 792                                               add_image_flags,
 793                                               progress_func,
 794                                               sd_set,
 795                                               path_utf16,
 796                                               path_utf16_nchars);
 797         } else if (inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 798                 /* Reparse point: save the reparse tag and data */
 799                 ret = win32_capture_reparse_point(hFile,
 800                                                   inode,
 801                                                   lookup_table,
 802                                                   root_disk_path);
 803         } else {
 804                 /* Not a directory, not a reparse point; capture the default
 805                  * file contents and any alternate data streams. */
 806                 ret = win32_capture_streams(path_utf16,
 807                                             path_utf16_nchars,
 808                                             inode,
 809                                             lookup_table,
 810                                             file_size);
 811         }
 812 out_close_handle:
 813         CloseHandle(hFile);
 814 out_free_path_utf16:
 815         FREE(path_utf16);
 816 out_destroy_sd_set:
 817         if (extra_arg == NULL)
 818                 destroy_sd_set(sd_set);
 819 out:
 820         if (ret == 0)
 821                 *root_ret = root;
 822         else
 823                 free_dentry_tree(root, lookup_table);
 824         return ret;
 825 }
 826
 827 /* Replacement for POSIX fnmatch() (partial functionality only) */
 828 int
 829 fnmatch(const char *pattern, const char *string, int flags)
 830 {
 831         if (PathMatchSpecA(string, pattern))
 832                 return 0;
 833         else
 834                 return FNM_NOMATCH;
 835 }
 836
 837 static int
 838 win32_set_reparse_data(HANDLE h,
 839                        u32 reparse_tag,
 840                        const struct wim_lookup_table_entry *lte,
 841                        const wchar_t *path)
 842 {
 843         int ret;
 844         u8 *buf;
 845         size_t len;
 846
 847         if (!lte) {
 848                 WARNING("\"%ls\" is marked as a reparse point but had no reparse data",
 849                         path);
 850                 return 0;
 851         }
 852         len = wim_resource_size(lte);
 853         if (len > 16 * 1024 - 8) {
 854                 WARNING("\"%ls\": reparse data too long!", path);
 855                 return 0;
 856         }
 857
 858         /* The WIM stream omits the ReparseTag and ReparseDataLength fields, so
 859          * leave 8 bytes of space for them at the beginning of the buffer, then
 860          * set them manually. */
 861         buf = alloca(len + 8);
 862         ret = read_full_wim_resource(lte, buf + 8, 0);
 863         if (ret)
 864                 return ret;
 865         *(u32*)(buf + 0) = cpu_to_le32(reparse_tag);
 866         *(u16*)(buf + 4) = cpu_to_le16(len);
 867         *(u16*)(buf + 6) = 0;
 868
 869         /* Set the reparse data on the open file using the
 870          * FSCTL_SET_REPARSE_POINT ioctl.
 871          *
 872          * There are contradictions in Microsoft's documentation for this:
 873          *
 874          * "If hDevice was opened without specifying FILE_FLAG_OVERLAPPED,
 875          * lpOverlapped is ignored."
 876          *
 877          * --- So setting lpOverlapped to NULL is okay since it's ignored.
 878          *
 879          * "If lpOverlapped is NULL, lpBytesReturned cannot be NULL. Even when an
 880          * operation returns no output data and lpOutBuffer is NULL,
 881          * DeviceIoControl makes use of lpBytesReturned. After such an
 882          * operation, the value of lpBytesReturned is meaningless."
 883          *
 884          * --- So lpOverlapped not really ignored, as it affects another
 885          *  parameter.  This is the actual behavior: lpBytesReturned must be
 886          *  specified, even though lpBytesReturned is documented as:
 887          *
 888          *  "Not used with this operation; set to NULL."
 889          */
 890         DWORD bytesReturned;
 891         if (!DeviceIoControl(h, FSCTL_SET_REPARSE_POINT, buf, len + 8,
 892                              NULL, 0,
 893                              &bytesReturned /* lpBytesReturned */,
 894                              NULL /* lpOverlapped */))
 895         {
 896                 DWORD err = GetLastError();
 897                 ERROR("Failed to set reparse data on \"%ls\"", path);
 898                 win32_error(err);
 899                 return WIMLIB_ERR_WRITE;
 900         }
 901         return 0;
 902 }
 903
 904
 905 static int
 906 win32_extract_chunk(const void *buf, size_t len, u64 offset, void *arg)
 907 {
 908         HANDLE hStream = arg;
 909
 910         DWORD nbytes_written;
 911         wimlib_assert(len <= 0xffffffff);
 912
 913         if (!WriteFile(hStream, buf, len, &nbytes_written, NULL) ||
 914             nbytes_written != len)
 915         {
 916                 DWORD err = GetLastError();
 917                 ERROR("WriteFile(): write error");
 918                 win32_error(err);
 919                 return WIMLIB_ERR_WRITE;
 920         }
 921         return 0;
 922 }
 923
 924 static int
 925 do_win32_extract_stream(HANDLE hStream, struct wim_lookup_table_entry *lte)
 926 {
 927         return extract_wim_resource(lte, wim_resource_size(lte),
 928                                     win32_extract_chunk, hStream);
 929 }
 930
 931 static int
 932 win32_extract_stream(const struct wim_inode *inode,
 933                      const wchar_t *path,
 934                      const wchar_t *stream_name_utf16,
 935                      struct wim_lookup_table_entry *lte,
 936                      const struct wim_security_data *security_data)
 937 {
 938         wchar_t *stream_path;
 939         HANDLE h;
 940         int ret;
 941         DWORD err;
 942         DWORD creationDisposition = CREATE_ALWAYS;
 943
 944         SECURITY_ATTRIBUTES *secattr;
 945
 946         if (security_data && inode->i_security_id != -1) {
 947                 secattr = alloca(sizeof(*secattr));
 948                 secattr->nLength = sizeof(*secattr);
 949                 secattr->lpSecurityDescriptor = security_data->descriptors[inode->i_security_id];
 950                 secattr->bInheritHandle = FALSE;
 951         } else {
 952                 secattr = NULL;
 953         }
 954
 955         if (stream_name_utf16) {
 956                 /* Named stream.  Create a buffer that contains the UTF-16LE
 957                  * string [.\]@path:@stream_name_utf16.  This is needed to
 958                  * create and open the stream using CreateFileW().  I'm not
 959                  * aware of any other APIs to do this.  Note: the '$DATA' suffix
 960                  * seems to be unneeded.  Additional note: a "./" prefix needs
 961                  * to be added when the path is not absolute to avoid ambiguity
 962                  * with drive letters. */
 963                 size_t stream_path_nchars;
 964                 size_t path_nchars;
 965                 size_t stream_name_nchars;
 966                 const wchar_t *prefix;
 967
 968                 path_nchars = wcslen(path);
 969                 stream_name_nchars = wcslen(stream_name_utf16);
 970                 stream_path_nchars = path_nchars + 1 + stream_name_nchars;
 971                 if (path[0] != cpu_to_le16(L'\0') &&
 972                     path[0] != cpu_to_le16(L'/') &&
 973                     path[0] != cpu_to_le16(L'\\') &&
 974                     path[1] != cpu_to_le16(L':'))
 975                 {
 976                         prefix = L"./";
 977                         stream_path_nchars += 2;
 978                 } else {
 979                         prefix = L"";
 980                 }
 981                 stream_path = alloca((stream_path_nchars + 1) * sizeof(wchar_t));
 982                 swprintf(stream_path, stream_path_nchars + 1, L"%ls%ls:%ls",
 983                          prefix, path, stream_name_utf16);
 984         } else {
 985                 /* Unnamed stream; its path is just the path to the file itself.
 986                  * */
 987                 stream_path = (wchar_t*)path;
 988
 989                 /* Directories must be created with CreateDirectoryW().  Then
 990                  * the call to CreateFileW() will merely open the directory that
 991                  * was already created rather than creating a new file. */
 992                 if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY) {
 993                         if (!CreateDirectoryW(stream_path, secattr)) {
 994                                 err = GetLastError();
 995                                 if (err != ERROR_ALREADY_EXISTS) {
 996                                         ERROR("Failed to create directory \"%ls\"",
 997                                               stream_path);
 998                                         win32_error(err);
 999                                         ret = WIMLIB_ERR_MKDIR;
1000                                         goto fail;
1001                                 }
1002                         }
1003                         DEBUG("Created directory \"%ls\"", stream_path);
1004                         if (!(inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT)) {
1005                                 ret = 0;
1006                                 goto out;
1007                         }
1008                         creationDisposition = OPEN_EXISTING;
1009                 }
1010         }
1011
1012         DEBUG("Opening \"%ls\"", stream_path);
1013         h = CreateFileW(stream_path,
1014                         GENERIC_WRITE,
1015                         0,
1016                         secattr,
1017                         creationDisposition,
1018                         FILE_FLAG_OPEN_REPARSE_POINT |
1019                             FILE_FLAG_BACKUP_SEMANTICS |
1020                             inode->i_attributes,
1021                         NULL);
1022         if (h == INVALID_HANDLE_VALUE) {
1023                 err = GetLastError();
1024                 ERROR("Failed to create \"%ls\"", stream_path);
1025                 win32_error(err);
1026                 ret = WIMLIB_ERR_OPEN;
1027                 goto fail;
1028         }
1029
1030         if (inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT &&
1031             stream_name_utf16 == NULL)
1032         {
1033                 DEBUG("Setting reparse data on \"%ls\"", path);
1034                 ret = win32_set_reparse_data(h, inode->i_reparse_tag, lte, path);
1035                 if (ret)
1036                         goto fail_close_handle;
1037         } else {
1038                 if (lte) {
1039                         DEBUG("Extracting \"%ls\" (len = %"PRIu64")",
1040                               stream_path, wim_resource_size(lte));
1041                         ret = do_win32_extract_stream(h, lte);
1042                         if (ret)
1043                                 goto fail_close_handle;
1044                 }
1045         }
1046
1047         DEBUG("Closing \"%ls\"", stream_path);
1048         if (!CloseHandle(h)) {
1049                 err = GetLastError();
1050                 ERROR("Failed to close \"%ls\"", stream_path);
1051                 win32_error(err);
1052                 ret = WIMLIB_ERR_WRITE;
1053                 goto fail;
1054         }
1055         ret = 0;
1056         goto out;
1057 fail_close_handle:
1058         CloseHandle(h);
1059 fail:
1060         ERROR("Error extracting %ls", stream_path);
1061 out:
1062         return ret;
1063 }
1064
1065 /*
1066  * Creates a file, directory, or reparse point and extracts all streams to it
1067  * (unnamed data stream and/or reparse point stream, plus any alternate data
1068  * streams).  This in Win32-specific code.
1069  *
1070  * @inode:      WIM inode for this file or directory.
1071  * @path:       UTF-16LE external path to extract the inode to.
1072  *
1073  * Returns 0 on success; nonzero on failure.
1074  */
1075 static int
1076 win32_extract_streams(const struct wim_inode *inode,
1077                       const wchar_t *path, u64 *completed_bytes_p,
1078                       const struct wim_security_data *security_data)
1079 {
1080         struct wim_lookup_table_entry *unnamed_lte;
1081         int ret;
1082
1083         unnamed_lte = inode_unnamed_lte_resolved(inode);
1084         ret = win32_extract_stream(inode, path, NULL, unnamed_lte,
1085                                    security_data);
1086         if (ret)
1087                 goto out;
1088         if (unnamed_lte)
1089                 *completed_bytes_p += wim_resource_size(unnamed_lte);
1090         for (u16 i = 0; i < inode->i_num_ads; i++) {
1091                 const struct wim_ads_entry *ads_entry = &inode->i_ads_entries[i];
1092                 if (ads_entry->stream_name_nbytes != 0) {
1093                         /* Skip special UNIX data entries (see documentation for
1094                          * WIMLIB_ADD_IMAGE_FLAG_UNIX_DATA) */
1095                         if (ads_entry->stream_name_nbytes == WIMLIB_UNIX_DATA_TAG_UTF16LE_NBYTES
1096                             && !memcmp(ads_entry->stream_name,
1097                                        WIMLIB_UNIX_DATA_TAG_UTF16LE,
1098                                        WIMLIB_UNIX_DATA_TAG_UTF16LE_NBYTES))
1099                                 continue;
1100                         ret = win32_extract_stream(inode,
1101                                                    path,
1102                                                    ads_entry->stream_name,
1103                                                    ads_entry->lte,
1104                                                    NULL);
1105                         if (ret)
1106                                 break;
1107                         if (ads_entry->lte)
1108                                 *completed_bytes_p += wim_resource_size(ads_entry->lte);
1109                 }
1110         }
1111 out:
1112         return ret;
1113 }
1114
1115 /* Extract a file, directory, reparse point, or hard link to an
1116  * already-extracted file using the Win32 API */
1117 int win32_do_apply_dentry(const mbchar *output_path,
1118                           size_t output_path_nbytes,
1119                           struct wim_dentry *dentry,
1120                           struct apply_args *args)
1121 {
1122         wchar_t *utf16le_path;
1123         size_t utf16le_path_nbytes;
1124         DWORD err;
1125         int ret;
1126         struct wim_inode *inode = dentry->d_inode;
1127
1128         ret = mbs_to_utf16le(output_path, output_path_nbytes,
1129                              &utf16le_path, &utf16le_path_nbytes);
1130         if (ret)
1131                 return ret;
1132
1133         if (inode->i_nlink > 1 && inode->i_extracted_file != NULL) {
1134                 /* Linked file, with another name already extracted.  Create a
1135                  * hard link. */
1136                 DEBUG("Creating hard link \"%ls => %ls\"",
1137                       utf16le_path, inode->i_extracted_file);
1138                 if (!CreateHardLinkW(utf16le_path, inode->i_extracted_file, NULL))
1139                 {
1140                         err = GetLastError();
1141                         ERROR("Can't create hard link \"%ls => %ls\"",
1142                               utf16le_path, inode->i_extracted_file);
1143                         ret = WIMLIB_ERR_LINK;
1144                         win32_error(err);
1145                 }
1146         } else {
1147                 /* Create the file, directory, or reparse point, and extract the
1148                  * data streams. */
1149                 const struct wim_security_data *security_data;
1150                 if (args->extract_flags & WIMLIB_EXTRACT_FLAG_NOACLS)
1151                         security_data = NULL;
1152                 else
1153                         security_data = wim_const_security_data(args->w);
1154
1155                 ret = win32_extract_streams(inode, utf16le_path,
1156                                             &args->progress.extract.completed_bytes,
1157                                             security_data);
1158                 if (ret)
1159                         goto out_free_utf16_path;
1160
1161                 if (inode->i_nlink > 1) {
1162                         /* Save extracted path for a later call to
1163                          * CreateHardLinkW() if this inode has multiple links.
1164                          * */
1165                         inode->i_extracted_file = utf16le_path;
1166                         goto out;
1167                 }
1168         }
1169 out_free_utf16_path:
1170         FREE(utf16le_path);
1171 out:
1172         return ret;
1173 }
1174
1175 /* Set timestamps on an extracted file using the Win32 API */
1176 int
1177 win32_do_apply_dentry_timestamps(const mbchar *output_path,
1178                                  size_t output_path_nbytes,
1179                                  const struct wim_dentry *dentry,
1180                                  const struct apply_args *args)
1181 {
1182         /* Win32 */
1183         wchar_t *utf16le_path;
1184         size_t utf16le_path_nbytes;
1185         DWORD err;
1186         HANDLE h;
1187         int ret;
1188         const struct wim_inode *inode = dentry->d_inode;
1189
1190         ret = mbs_to_utf16le(output_path, output_path_nbytes,
1191                             &utf16le_path, &utf16le_path_nbytes);
1192         if (ret)
1193                 return ret;
1194
1195         DEBUG("Opening \"%s\" to set timestamps", output_path);
1196         h = win32_open_existing_file(utf16le_path, FILE_WRITE_ATTRIBUTES);
1197
1198         if (h == INVALID_HANDLE_VALUE)
1199                 err = GetLastError();
1200         FREE(utf16le_path);
1201         if (h == INVALID_HANDLE_VALUE)
1202                 goto fail;
1203
1204         FILETIME creationTime = {.dwLowDateTime = inode->i_creation_time & 0xffffffff,
1205                                  .dwHighDateTime = inode->i_creation_time >> 32};
1206         FILETIME lastAccessTime = {.dwLowDateTime = inode->i_last_access_time & 0xffffffff,
1207                                   .dwHighDateTime = inode->i_last_access_time >> 32};
1208         FILETIME lastWriteTime = {.dwLowDateTime = inode->i_last_write_time & 0xffffffff,
1209                                   .dwHighDateTime = inode->i_last_write_time >> 32};
1210
1211         DEBUG("Calling SetFileTime() on \"%s\"", output_path);
1212         if (!SetFileTime(h, &creationTime, &lastAccessTime, &lastWriteTime)) {
1213                 err = GetLastError();
1214                 CloseHandle(h);
1215                 goto fail;
1216         }
1217         DEBUG("Closing \"%s\"", output_path);
1218         if (!CloseHandle(h)) {
1219                 err = GetLastError();
1220                 goto fail;
1221         }
1222         goto out;
1223 fail:
1224         /* Only warn if setting timestamps failed. */
1225         WARNING("Can't set timestamps on \"%s\"", output_path);
1226         win32_error(err);
1227 out:
1228         return 0;
1229 }
1230
1231 /* Replacement for POSIX fsync() */
1232 int
1233 fsync(int fd)
1234 {
1235         HANDLE h = (HANDLE)_get_osfhandle(fd);
1236         if (h == INVALID_HANDLE_VALUE) {
1237                 ERROR("Could not get Windows handle for file descriptor");
1238                 win32_error(GetLastError());
1239                 errno = EBADF;
1240                 return -1;
1241         }
1242         if (!FlushFileBuffers(h)) {
1243                 ERROR("Could not flush file buffers to disk");
1244                 win32_error(GetLastError());
1245                 errno = EIO;
1246                 return -1;
1247         }
1248         return 0;
1249 }
1250
1251 /* Use the Win32 API to get the number of processors */
1252 unsigned
1253 win32_get_number_of_processors()
1254 {
1255         SYSTEM_INFO sysinfo;
1256         GetSystemInfo(&sysinfo);
1257         return sysinfo.dwNumberOfProcessors;
1258 }
1259
1260 /* Replacement for POSIX-2008 realpath().  Warning: partial functionality only
1261  * (resolved_path must be NULL).   Also I highly doubt that GetFullPathName
1262  * really does the right thing under all circumstances. */
1263 mbchar *
1264 realpath(const mbchar *path, mbchar *resolved_path)
1265 {
1266         DWORD ret;
1267         wimlib_assert(resolved_path == NULL);
1268
1269         ret = GetFullPathNameA(path, 0, NULL, NULL);
1270         if (!ret)
1271                 goto fail_win32;
1272
1273         resolved_path = MALLOC(ret);
1274         if (!resolved_path)
1275                 goto fail;
1276         ret = GetFullPathNameA(path, ret, resolved_path, NULL);
1277         if (!ret) {
1278                 free(resolved_path);
1279                 goto fail_win32;
1280         }
1281         return resolved_path;
1282 fail_win32:
1283         win32_error(GetLastError());
1284 fail:
1285         return NULL;
1286 }
1287
1288 char *
1289 nl_langinfo(nl_item item)
1290 {
1291         wimlib_assert(item == CODESET);
1292         static char buf[64];
1293         strcpy(buf, "Unknown");
1294         return buf;
1295 }
1296
1297 /* rename() on Windows fails if the destination file exists.  Fix it. */
1298 int
1299 rename_replacement(const char *oldpath, const char *newpath)
1300 {
1301         if (MoveFileExA(oldpath, newpath, MOVEFILE_REPLACE_EXISTING)) {
1302                 return 0;
1303         } else {
1304                 /* As usual, the possible error values are not documented */
1305                 DWORD err = GetLastError();
1306                 ERROR("MoveFileExA(): Can't rename \"%s\" to \"%s\"",
1307                       oldpath, newpath);
1308                 win32_error(err);
1309                 errno = 0;
1310                 return -1;
1311         }
1312 }