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   1 /*
   2  * win32_common.c - Windows code common to applying and capturing images.
   3  */
   4
   5 /*
   6  * Copyright (C) 2013, 2014 Eric Biggers
   7  *
   8  * This file is free software; you can redistribute it and/or modify it under
   9  * the terms of the GNU Lesser General Public License as published by the Free
  10  * Software Foundation; either version 3 of the License, or (at your option) any
  11  * later version.
  12  *
  13  * This file is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  15  * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this file; if not, see http://www.gnu.org/licenses/.
  20  */
  21
  22 #ifdef __WIN32__
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include "config.h"
  26 #endif
  27
  28 #include <errno.h>
  29
  30 #include "wimlib/win32_common.h"
  31
  32 #include "wimlib/error.h"
  33 #include "wimlib/util.h"
  34
  35 static int
  36 win32_error_to_errno(DWORD err_code)
  37 {
  38         /* This mapping is that used in Cygwin.
  39          * Some of these choices are arbitrary. */
  40         switch (err_code) {
  41         case ERROR_ACCESS_DENIED:
  42                 return EACCES;
  43         case ERROR_ACTIVE_CONNECTIONS:
  44                 return EAGAIN;
  45         case ERROR_ALREADY_EXISTS:
  46                 return EEXIST;
  47         case ERROR_BAD_DEVICE:
  48                 return ENODEV;
  49         case ERROR_BAD_EXE_FORMAT:
  50                 return ENOEXEC;
  51         case ERROR_BAD_NETPATH:
  52                 return ENOENT;
  53         case ERROR_BAD_NET_NAME:
  54                 return ENOENT;
  55         case ERROR_BAD_NET_RESP:
  56                 return ENOSYS;
  57         case ERROR_BAD_PATHNAME:
  58                 return ENOENT;
  59         case ERROR_BAD_PIPE:
  60                 return EINVAL;
  61         case ERROR_BAD_UNIT:
  62                 return ENODEV;
  63         case ERROR_BAD_USERNAME:
  64                 return EINVAL;
  65         case ERROR_BEGINNING_OF_MEDIA:
  66                 return EIO;
  67         case ERROR_BROKEN_PIPE:
  68                 return EPIPE;
  69         case ERROR_BUSY:
  70                 return EBUSY;
  71         case ERROR_BUS_RESET:
  72                 return EIO;
  73         case ERROR_CALL_NOT_IMPLEMENTED:
  74                 return ENOSYS;
  75         case ERROR_CANNOT_MAKE:
  76                 return EPERM;
  77         case ERROR_CHILD_NOT_COMPLETE:
  78                 return EBUSY;
  79         case ERROR_COMMITMENT_LIMIT:
  80                 return EAGAIN;
  81         case ERROR_CRC:
  82                 return EIO;
  83         case ERROR_DEVICE_DOOR_OPEN:
  84                 return EIO;
  85         case ERROR_DEVICE_IN_USE:
  86                 return EAGAIN;
  87         case ERROR_DEVICE_REQUIRES_CLEANING:
  88                 return EIO;
  89         case ERROR_DIRECTORY:
  90                 return ENOTDIR;
  91         case ERROR_DIR_NOT_EMPTY:
  92                 return ENOTEMPTY;
  93         case ERROR_DISK_CORRUPT:
  94                 return EIO;
  95         case ERROR_DISK_FULL:
  96                 return ENOSPC;
  97 #ifdef ENOTUNIQ
  98         case ERROR_DUP_NAME:
  99                 return ENOTUNIQ;
 100 #endif
 101         case ERROR_EAS_DIDNT_FIT:
 102                 return ENOSPC;
 103 #ifdef ENOTSUP
 104         case ERROR_EAS_NOT_SUPPORTED:
 105                 return ENOTSUP;
 106 #endif
 107         case ERROR_EA_LIST_INCONSISTENT:
 108                 return EINVAL;
 109         case ERROR_EA_TABLE_FULL:
 110                 return ENOSPC;
 111         case ERROR_END_OF_MEDIA:
 112                 return ENOSPC;
 113         case ERROR_EOM_OVERFLOW:
 114                 return EIO;
 115         case ERROR_EXE_MACHINE_TYPE_MISMATCH:
 116                 return ENOEXEC;
 117         case ERROR_EXE_MARKED_INVALID:
 118                 return ENOEXEC;
 119         case ERROR_FILEMARK_DETECTED:
 120                 return EIO;
 121         case ERROR_FILENAME_EXCED_RANGE:
 122                 return ENAMETOOLONG;
 123         case ERROR_FILE_CORRUPT:
 124                 return EEXIST;
 125         case ERROR_FILE_EXISTS:
 126                 return EEXIST;
 127         case ERROR_FILE_INVALID:
 128                 return ENXIO;
 129         case ERROR_FILE_NOT_FOUND:
 130                 return ENOENT;
 131         case ERROR_HANDLE_DISK_FULL:
 132                 return ENOSPC;
 133 #ifdef ENODATA
 134         case ERROR_HANDLE_EOF:
 135                 return ENODATA;
 136 #endif
 137         case ERROR_INVALID_ADDRESS:
 138                 return EINVAL;
 139         case ERROR_INVALID_AT_INTERRUPT_TIME:
 140                 return EINTR;
 141         case ERROR_INVALID_BLOCK_LENGTH:
 142                 return EIO;
 143         case ERROR_INVALID_DATA:
 144                 return EINVAL;
 145         case ERROR_INVALID_DRIVE:
 146                 return ENODEV;
 147         case ERROR_INVALID_EA_NAME:
 148                 return EINVAL;
 149         case ERROR_INVALID_EXE_SIGNATURE:
 150                 return ENOEXEC;
 151 #ifdef EBADRQC
 152         case ERROR_INVALID_FUNCTION:
 153                 return EBADRQC;
 154 #endif
 155         case ERROR_INVALID_HANDLE:
 156                 return EBADF;
 157         case ERROR_INVALID_NAME:
 158                 return ENOENT;
 159         case ERROR_INVALID_PARAMETER:
 160                 return EINVAL;
 161         case ERROR_INVALID_SIGNAL_NUMBER:
 162                 return EINVAL;
 163         case ERROR_IOPL_NOT_ENABLED:
 164                 return ENOEXEC;
 165         case ERROR_IO_DEVICE:
 166                 return EIO;
 167         case ERROR_IO_INCOMPLETE:
 168                 return EAGAIN;
 169         case ERROR_IO_PENDING:
 170                 return EAGAIN;
 171         case ERROR_LOCK_VIOLATION:
 172                 return EBUSY;
 173         case ERROR_MAX_THRDS_REACHED:
 174                 return EAGAIN;
 175         case ERROR_META_EXPANSION_TOO_LONG:
 176                 return EINVAL;
 177         case ERROR_MOD_NOT_FOUND:
 178                 return ENOENT;
 179 #ifdef EMSGSIZE
 180         case ERROR_MORE_DATA:
 181                 return EMSGSIZE;
 182 #endif
 183         case ERROR_NEGATIVE_SEEK:
 184                 return EINVAL;
 185         case ERROR_NETNAME_DELETED:
 186                 return ENOENT;
 187         case ERROR_NOACCESS:
 188                 return EFAULT;
 189         case ERROR_NONE_MAPPED:
 190                 return EINVAL;
 191         case ERROR_NONPAGED_SYSTEM_RESOURCES:
 192                 return EAGAIN;
 193 #ifdef ENOLINK
 194         case ERROR_NOT_CONNECTED:
 195                 return ENOLINK;
 196 #endif
 197         case ERROR_NOT_ENOUGH_MEMORY:
 198                 return ENOMEM;
 199         case ERROR_NOT_OWNER:
 200                 return EPERM;
 201 #ifdef ENOMEDIUM
 202         case ERROR_NOT_READY:
 203                 return ENOMEDIUM;
 204 #endif
 205         case ERROR_NOT_SAME_DEVICE:
 206                 return EXDEV;
 207         case ERROR_NOT_SUPPORTED:
 208                 return ENOSYS;
 209         case ERROR_NO_DATA:
 210                 return EPIPE;
 211         case ERROR_NO_DATA_DETECTED:
 212                 return EIO;
 213 #ifdef ENOMEDIUM
 214         case ERROR_NO_MEDIA_IN_DRIVE:
 215                 return ENOMEDIUM;
 216 #endif
 217 #ifdef ENMFILE
 218         case ERROR_NO_MORE_FILES:
 219                 return ENMFILE;
 220 #endif
 221 #ifdef ENMFILE
 222         case ERROR_NO_MORE_ITEMS:
 223                 return ENMFILE;
 224 #endif
 225         case ERROR_NO_MORE_SEARCH_HANDLES:
 226                 return ENFILE;
 227         case ERROR_NO_PROC_SLOTS:
 228                 return EAGAIN;
 229         case ERROR_NO_SIGNAL_SENT:
 230                 return EIO;
 231         case ERROR_NO_SYSTEM_RESOURCES:
 232                 return EFBIG;
 233         case ERROR_NO_TOKEN:
 234                 return EINVAL;
 235         case ERROR_OPEN_FAILED:
 236                 return EIO;
 237         case ERROR_OPEN_FILES:
 238                 return EAGAIN;
 239         case ERROR_OUTOFMEMORY:
 240                 return ENOMEM;
 241         case ERROR_PAGED_SYSTEM_RESOURCES:
 242                 return EAGAIN;
 243         case ERROR_PAGEFILE_QUOTA:
 244                 return EAGAIN;
 245         case ERROR_PATH_NOT_FOUND:
 246                 return ENOENT;
 247         case ERROR_PIPE_BUSY:
 248                 return EBUSY;
 249         case ERROR_PIPE_CONNECTED:
 250                 return EBUSY;
 251 #ifdef ECOMM
 252         case ERROR_PIPE_LISTENING:
 253                 return ECOMM;
 254         case ERROR_PIPE_NOT_CONNECTED:
 255                 return ECOMM;
 256 #endif
 257         case ERROR_POSSIBLE_DEADLOCK:
 258                 return EDEADLOCK;
 259         case ERROR_PRIVILEGE_NOT_HELD:
 260                 return EPERM;
 261         case ERROR_PROCESS_ABORTED:
 262                 return EFAULT;
 263         case ERROR_PROC_NOT_FOUND:
 264                 return ESRCH;
 265 #ifdef ENONET
 266         case ERROR_REM_NOT_LIST:
 267                 return ENONET;
 268 #endif
 269         case ERROR_SECTOR_NOT_FOUND:
 270                 return EINVAL;
 271         case ERROR_SEEK:
 272                 return EINVAL;
 273         case ERROR_SETMARK_DETECTED:
 274                 return EIO;
 275         case ERROR_SHARING_BUFFER_EXCEEDED:
 276                 return ENOLCK;
 277         case ERROR_SHARING_VIOLATION:
 278                 return EBUSY;
 279         case ERROR_SIGNAL_PENDING:
 280                 return EBUSY;
 281         case ERROR_SIGNAL_REFUSED:
 282                 return EIO;
 283 #ifdef ELIBBAD
 284         case ERROR_SXS_CANT_GEN_ACTCTX:
 285                 return ELIBBAD;
 286 #endif
 287         case ERROR_THREAD_1_INACTIVE:
 288                 return EINVAL;
 289         case ERROR_TOO_MANY_LINKS:
 290                 return EMLINK;
 291         case ERROR_TOO_MANY_OPEN_FILES:
 292                 return EMFILE;
 293         case ERROR_WAIT_NO_CHILDREN:
 294                 return ECHILD;
 295         case ERROR_WORKING_SET_QUOTA:
 296                 return EAGAIN;
 297         case ERROR_WRITE_PROTECT:
 298                 return EROFS;
 299         default:
 300                 return -1;
 301         }
 302 }
 303
 304 void
 305 set_errno_from_win32_error(DWORD err)
 306 {
 307         errno = win32_error_to_errno(err);
 308 }
 309
 310 void
 311 set_errno_from_GetLastError(void)
 312 {
 313         set_errno_from_win32_error(GetLastError());
 314 }
 315
 316 void
 317 set_errno_from_nt_status(NTSTATUS status)
 318 {
 319         set_errno_from_win32_error((*func_RtlNtStatusToDosError)(status));
 320 }
 321
 322 static bool
 323 win32_modify_privilege(const wchar_t *privilege, bool enable)
 324 {
 325         HANDLE hToken;
 326         LUID luid;
 327         TOKEN_PRIVILEGES newState;
 328         bool ret = FALSE;
 329
 330         if (!OpenProcessToken(GetCurrentProcess(),
 331                               TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY,
 332                               &hToken))
 333                 goto out;
 334
 335         if (!LookupPrivilegeValue(NULL, privilege, &luid))
 336                 goto out_close_handle;
 337
 338         newState.PrivilegeCount = 1;
 339         newState.Privileges[0].Luid = luid;
 340         newState.Privileges[0].Attributes = (enable ? SE_PRIVILEGE_ENABLED : 0);
 341         SetLastError(ERROR_SUCCESS);
 342         ret = AdjustTokenPrivileges(hToken, FALSE, &newState, 0, NULL, NULL);
 343         if (ret && GetLastError() == ERROR_NOT_ALL_ASSIGNED)
 344                 ret = FALSE;
 345 out_close_handle:
 346         CloseHandle(hToken);
 347 out:
 348         return ret;
 349 }
 350
 351 static bool
 352 win32_modify_capture_privileges(bool enable)
 353 {
 354         return win32_modify_privilege(SE_BACKUP_NAME, enable)
 355             && win32_modify_privilege(SE_SECURITY_NAME, enable);
 356 }
 357
 358 static bool
 359 win32_modify_apply_privileges(bool enable)
 360 {
 361         return win32_modify_privilege(SE_RESTORE_NAME, enable)
 362             && win32_modify_privilege(SE_SECURITY_NAME, enable)
 363             && win32_modify_privilege(SE_TAKE_OWNERSHIP_NAME, enable);
 364 }
 365
 366 static void
 367 win32_release_capture_and_apply_privileges(void)
 368 {
 369         win32_modify_capture_privileges(false);
 370         win32_modify_apply_privileges(false);
 371 }
 372
 373 /* Pointers to dynamically loaded functions  */
 374
 375 /* ntdll.dll  */
 376
 377 NTSTATUS (WINAPI *func_NtCreateFile)(PHANDLE FileHandle,
 378                                      ACCESS_MASK DesiredAccess,
 379                                      POBJECT_ATTRIBUTES ObjectAttributes,
 380                                      PIO_STATUS_BLOCK IoStatusBlock,
 381                                      PLARGE_INTEGER AllocationSize,
 382                                      ULONG FileAttributes,
 383                                      ULONG ShareAccess,
 384                                      ULONG CreateDisposition,
 385                                      ULONG CreateOptions,
 386                                      PVOID EaBuffer,
 387                                      ULONG EaLength);
 388
 389 NTSTATUS (WINAPI *func_NtOpenFile) (PHANDLE FileHandle,
 390                                     ACCESS_MASK DesiredAccess,
 391                                     POBJECT_ATTRIBUTES ObjectAttributes,
 392                                     PIO_STATUS_BLOCK IoStatusBlock,
 393                                     ULONG ShareAccess,
 394                                     ULONG OpenOptions);
 395
 396 NTSTATUS (WINAPI *func_NtReadFile) (HANDLE FileHandle,
 397                                     HANDLE Event,
 398                                     PIO_APC_ROUTINE ApcRoutine,
 399                                     PVOID ApcContext,
 400                                     PIO_STATUS_BLOCK IoStatusBlock,
 401                                     PVOID Buffer,
 402                                     ULONG Length,
 403                                     PLARGE_INTEGER ByteOffset,
 404                                     PULONG Key);
 405
 406 NTSTATUS (WINAPI *func_NtWriteFile) (HANDLE FileHandle,
 407                                      HANDLE Event,
 408                                      PIO_APC_ROUTINE ApcRoutine,
 409                                      PVOID ApcContext,
 410                                      PIO_STATUS_BLOCK IoStatusBlock,
 411                                      PVOID Buffer,
 412                                      ULONG Length,
 413                                      PLARGE_INTEGER ByteOffset,
 414                                      PULONG Key);
 415
 416 NTSTATUS (WINAPI *func_NtQueryInformationFile)(HANDLE FileHandle,
 417                                                PIO_STATUS_BLOCK IoStatusBlock,
 418                                                PVOID FileInformation,
 419                                                ULONG Length,
 420                                                FILE_INFORMATION_CLASS FileInformationClass);
 421
 422 NTSTATUS (WINAPI *func_NtQuerySecurityObject)(HANDLE handle,
 423                                               SECURITY_INFORMATION SecurityInformation,
 424                                               PSECURITY_DESCRIPTOR SecurityDescriptor,
 425                                               ULONG Length,
 426                                               PULONG LengthNeeded);
 427
 428 NTSTATUS (WINAPI *func_NtQueryDirectoryFile) (HANDLE FileHandle,
 429                                               HANDLE Event,
 430                                               PIO_APC_ROUTINE ApcRoutine,
 431                                               PVOID ApcContext,
 432                                               PIO_STATUS_BLOCK IoStatusBlock,
 433                                               PVOID FileInformation,
 434                                               ULONG Length,
 435                                               FILE_INFORMATION_CLASS FileInformationClass,
 436                                               BOOLEAN ReturnSingleEntry,
 437                                               PUNICODE_STRING FileName,
 438                                               BOOLEAN RestartScan);
 439
 440 NTSTATUS (WINAPI *func_NtQueryVolumeInformationFile) (HANDLE FileHandle,
 441                                                       PIO_STATUS_BLOCK IoStatusBlock,
 442                                                       PVOID FsInformation,
 443                                                       ULONG Length,
 444                                                       FS_INFORMATION_CLASS FsInformationClass);
 445
 446 NTSTATUS (WINAPI *func_NtSetInformationFile)(HANDLE FileHandle,
 447                                              PIO_STATUS_BLOCK IoStatusBlock,
 448                                              PVOID FileInformation,
 449                                              ULONG Length,
 450                                              FILE_INFORMATION_CLASS FileInformationClass);
 451
 452 NTSTATUS (WINAPI *func_NtSetSecurityObject)(HANDLE Handle,
 453                                             SECURITY_INFORMATION SecurityInformation,
 454                                             PSECURITY_DESCRIPTOR SecurityDescriptor);
 455
 456 NTSTATUS (WINAPI *func_NtFsControlFile) (HANDLE FileHandle,
 457                                          HANDLE Event,
 458                                          PIO_APC_ROUTINE ApcRoutine,
 459                                          PVOID ApcContext,
 460                                          PIO_STATUS_BLOCK IoStatusBlock,
 461                                          ULONG FsControlCode,
 462                                          PVOID InputBuffer,
 463                                          ULONG InputBufferLength,
 464                                          PVOID OutputBuffer,
 465                                          ULONG OutputBufferLength);
 466
 467 NTSTATUS (WINAPI *func_NtClose) (HANDLE Handle);
 468
 469 DWORD (WINAPI *func_RtlNtStatusToDosError)(NTSTATUS status);
 470
 471 BOOLEAN (WINAPI *func_RtlDosPathNameToNtPathName_U)
 472                   (IN PCWSTR DosName,
 473                    OUT PUNICODE_STRING NtName,
 474                    OUT PCWSTR *PartName,
 475                    OUT PRTL_RELATIVE_NAME_U RelativeName);
 476
 477 NTSTATUS (WINAPI *func_RtlDosPathNameToNtPathName_U_WithStatus)
 478                 (IN PCWSTR DosName,
 479                  OUT PUNICODE_STRING NtName,
 480                  OUT PCWSTR *PartName,
 481                  OUT PRTL_RELATIVE_NAME_U RelativeName);
 482
 483 NTSTATUS (WINAPI *func_RtlCreateSystemVolumeInformationFolder)
 484                 (PCUNICODE_STRING VolumeRootPath);
 485
 486 static bool acquired_privileges = false;
 487
 488 struct dll_sym {
 489         void **func_ptr;
 490         const char *name;
 491         bool required;
 492 };
 493
 494 #define DLL_SYM(name, required) { (void **)&func_##name, #name, required }
 495
 496 #define for_each_sym(sym, spec) \
 497         for ((sym) = (spec)->syms; (sym)->name; (sym)++)
 498
 499 struct dll_spec {
 500         const wchar_t *name;
 501         HMODULE handle;
 502         const struct dll_sym syms[];
 503 };
 504
 505 struct dll_spec ntdll_spec = {
 506         .name = L"ntdll.dll",
 507         .syms = {
 508                 DLL_SYM(NtCreateFile, true),
 509                 DLL_SYM(NtOpenFile, true),
 510                 DLL_SYM(NtReadFile, true),
 511                 DLL_SYM(NtWriteFile, true),
 512                 DLL_SYM(NtQueryInformationFile, true),
 513                 DLL_SYM(NtQuerySecurityObject, true),
 514                 DLL_SYM(NtQueryDirectoryFile, true),
 515                 DLL_SYM(NtQueryVolumeInformationFile, true),
 516                 DLL_SYM(NtSetInformationFile, true),
 517                 DLL_SYM(NtSetSecurityObject, true),
 518                 DLL_SYM(NtFsControlFile, true),
 519                 DLL_SYM(NtClose, true),
 520                 DLL_SYM(RtlNtStatusToDosError, true),
 521                 DLL_SYM(RtlCreateSystemVolumeInformationFolder, false),
 522                 DLL_SYM(RtlDosPathNameToNtPathName_U, true),
 523                 DLL_SYM(RtlDosPathNameToNtPathName_U_WithStatus, false), /* Not present on XP  */
 524                 {NULL, NULL},
 525         },
 526 };
 527
 528 static int
 529 init_dll(struct dll_spec *spec)
 530 {
 531         const struct dll_sym *sym;
 532         void *addr;
 533
 534         if (!spec->handle)
 535                 spec->handle = LoadLibrary(spec->name);
 536         if (!spec->handle) {
 537                 for_each_sym(sym, spec) {
 538                         if (sym->required) {
 539                                 ERROR("%ls could not be loaded!", spec->name);
 540                                 return WIMLIB_ERR_UNSUPPORTED;
 541                         }
 542                 }
 543                 return 0;
 544         }
 545         for_each_sym(sym, spec) {
 546                 addr = (void *)GetProcAddress(spec->handle, sym->name);
 547                 if (addr) {
 548                         *(sym->func_ptr) = addr;
 549                 } else if (sym->required) {
 550                         ERROR("Can't find %s in %ls", sym->name, spec->name);
 551                         return WIMLIB_ERR_UNSUPPORTED;
 552                 }
 553         }
 554         return 0;
 555 }
 556
 557 static void
 558 cleanup_dll(struct dll_spec *spec)
 559 {
 560         const struct dll_sym *sym;
 561
 562         if (spec->handle) {
 563                 FreeLibrary(spec->handle);
 564                 spec->handle = NULL;
 565
 566                 for_each_sym(sym, spec)
 567                         *(sym->func_ptr) = NULL;
 568         }
 569 }
 570
 571 /* One-time initialization for Windows capture/apply code.  */
 572 int
 573 win32_global_init(int init_flags)
 574 {
 575         int ret;
 576
 577         /* Try to acquire useful privileges.  */
 578         if (!(init_flags & WIMLIB_INIT_FLAG_DONT_ACQUIRE_PRIVILEGES)) {
 579                 ret = WIMLIB_ERR_INSUFFICIENT_PRIVILEGES;
 580                 if (!win32_modify_capture_privileges(true))
 581                         if (init_flags & WIMLIB_INIT_FLAG_STRICT_CAPTURE_PRIVILEGES)
 582                                 goto out_drop_privs;
 583                 if (!win32_modify_apply_privileges(true))
 584                         if (init_flags & WIMLIB_INIT_FLAG_STRICT_APPLY_PRIVILEGES)
 585                                 goto out_drop_privs;
 586                 acquired_privileges = true;
 587         }
 588
 589         ret = init_dll(&ntdll_spec);
 590         if (ret)
 591                 goto out_drop_privs;
 592
 593         return 0;
 594
 595 out_drop_privs:
 596         win32_release_capture_and_apply_privileges();
 597         return ret;
 598 }
 599
 600 void
 601 win32_global_cleanup(void)
 602 {
 603         if (acquired_privileges)
 604                 win32_release_capture_and_apply_privileges();
 605
 606         cleanup_dll(&ntdll_spec);
 607 }
 608
 609 /*
 610  * Translates a Win32-namespace path into an NT-namespace path.
 611  *
 612  * On success, returns 0.  The NT-namespace path will be stored in the
 613  * UNICODE_STRING structure pointed to by nt_path.  nt_path->Buffer will be set
 614  * to a new buffer that must later be freed with HeapFree().  (Really
 615  * RtlHeapFree(), but HeapFree() seems to be the same thing.)
 616  *
 617  * On failure, returns WIMLIB_ERR_NOMEM or WIMLIB_ERR_INVALID_PARAM.
 618  */
 619 int
 620 win32_path_to_nt_path(const wchar_t *win32_path, UNICODE_STRING *nt_path)
 621 {
 622         NTSTATUS status;
 623
 624         if (func_RtlDosPathNameToNtPathName_U_WithStatus) {
 625                 status = (*func_RtlDosPathNameToNtPathName_U_WithStatus)(win32_path,
 626                                                                          nt_path,
 627                                                                          NULL, NULL);
 628         } else {
 629                 if ((*func_RtlDosPathNameToNtPathName_U)(win32_path, nt_path,
 630                                                          NULL, NULL))
 631                         status = STATUS_SUCCESS;
 632                 else
 633                         status = STATUS_NO_MEMORY;
 634         }
 635
 636         if (likely(NT_SUCCESS(status)))
 637                 return 0;
 638
 639         if (status == STATUS_NO_MEMORY)
 640                 return WIMLIB_ERR_NOMEM;
 641
 642         ERROR("\"%ls\": invalid path name (status=0x%08"PRIx32")",
 643               win32_path, (u32)status);
 644         return WIMLIB_ERR_INVALID_PARAM;
 645 }
 646
 647 int
 648 win32_get_drive_path(const wchar_t *file_path, wchar_t drive_path[7])
 649 {
 650         tchar *file_abspath;
 651
 652         file_abspath = realpath(file_path, NULL);
 653         if (!file_abspath)
 654                 return WIMLIB_ERR_NOMEM;
 655
 656         if (file_abspath[0] == L'\0' || file_abspath[1] != L':') {
 657                 ERROR("\"%ls\": Path format not recognized", file_abspath);
 658                 FREE(file_abspath);
 659                 return WIMLIB_ERR_UNSUPPORTED;
 660         }
 661
 662         wsprintf(drive_path, L"\\\\.\\%lc:", file_abspath[0]);
 663         FREE(file_abspath);
 664         return 0;
 665 }
 666
 667
 668 #endif /* __WIN32__ */