summaryrefslogtreecommitdiffstats
path: root/src/VBox/Runtime/r3/nt/pathint-nt.cpp
blob: 95281ca70e1dca58be4b317e5b42b59f5dc23ab3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
/* $Id: pathint-nt.cpp $ */
/** @file
 * IPRT - Native NT, Internal Path stuff.
 */

/*
 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
 *
 * This file is part of VirtualBox base platform packages, as
 * available from https://www.virtualbox.org.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation, in version 3 of the
 * License.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <https://www.gnu.org/licenses>.
 *
 * The contents of this file may alternatively be used under the terms
 * of the Common Development and Distribution License Version 1.0
 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
 * in the VirtualBox distribution, in which case the provisions of the
 * CDDL are applicable instead of those of the GPL.
 *
 * You may elect to license modified versions of this file under the
 * terms and conditions of either the GPL or the CDDL or both.
 *
 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
 */


/*********************************************************************************************************************************
*   Header Files                                                                                                                 *
*********************************************************************************************************************************/
#define LOG_GROUP RTLOGGROUP_FS
#include "internal-r3-nt.h"

#include <iprt/assert.h>
#include <iprt/err.h>
#include <iprt/mem.h>
#include <iprt/path.h>
#include <iprt/string.h>
#include <iprt/utf16.h>


/*********************************************************************************************************************************
*   Global Variables                                                                                                             *
*********************************************************************************************************************************/
static char const g_szPrefixUnc[]      = "\\??\\UNC\\";
static char const g_szPrefix[]         = "\\??\\";
static char const g_szPrefixNt3xUnc[]  = "\\DosDevices\\UNC\\";
static char const g_szPrefixNt3x[]     = "\\DosDevices\\";


/**
 * Handles the pass thru case for UTF-8 input.
 * Win32 path uses "\\?\" prefix which is converted to "\??\" NT prefix.
 *
 * @returns IPRT status code.
 * @param   pNtName             Where to return the NT name.
 * @param   phRootDir           Where to return the root handle, if applicable.
 * @param   pszPath             The UTF-8 path.
 */
static int rtNtPathFromWinUtf8PassThru(struct _UNICODE_STRING *pNtName, PHANDLE phRootDir, const char *pszPath)
{
    PRTUTF16 pwszPath = NULL;
    size_t   cwcLen;
    int rc = RTStrToUtf16Ex(pszPath, RTSTR_MAX, &pwszPath, 0, &cwcLen);
    if (RT_SUCCESS(rc))
    {
        if (cwcLen < _32K - 1)
        {
            *phRootDir = NULL;
            if (RT_MAKE_U64(RTNtCurrentPeb()->OSMinorVersion, RTNtCurrentPeb()->OSMajorVersion) >= RT_MAKE_U64(0, 4))
            {
                pwszPath[0] = '\\';
                pwszPath[1] = '?';
                pwszPath[2] = '?';
                pwszPath[3] = '\\';

                pNtName->Buffer = pwszPath;
                pNtName->Length = (uint16_t)(cwcLen * sizeof(RTUTF16));
                pNtName->MaximumLength = pNtName->Length + sizeof(RTUTF16);
                return VINF_SUCCESS;
            }

            rc = RTUtf16Realloc(&pwszPath, cwcLen + sizeof(g_szPrefixNt3x));
            if (RT_SUCCESS(rc))
            {
                memmove(&pwszPath[sizeof(g_szPrefixNt3x) - 1], &pwszPath[4], (cwcLen - 4 + 1) * sizeof(RTUTF16));
                for (uint32_t i = 0; i < sizeof(g_szPrefixNt3x) - 1; i++)
                    pwszPath[i] = g_szPrefixNt3x[i];

                pNtName->Buffer = pwszPath;
                pNtName->Length = (uint16_t)((cwcLen - 4 + sizeof(g_szPrefixNt3x) - 1) * sizeof(RTUTF16));
                pNtName->MaximumLength = pNtName->Length + sizeof(RTUTF16);
                return VINF_SUCCESS;
            }
        }

        RTUtf16Free(pwszPath);
        rc = VERR_FILENAME_TOO_LONG;
    }
    return rc;
}


/**
 * Handles the pass thru case for UTF-16 input.
 * Win32 path uses "\\?\" prefix which is converted to "\??\" NT prefix.
 *
 * @returns IPRT status code.
 * @param   pNtName             Where to return the NT name.
 * @param   phRootDir           Stores NULL here, as we don't use it.
 * @param   pwszWinPath         The UTF-16 windows-style path.
 * @param   cwcWinPath          The length of the windows-style input path.
 */
static int rtNtPathFromWinUtf16PassThru(struct _UNICODE_STRING *pNtName, PHANDLE phRootDir,
                                        PCRTUTF16 pwszWinPath, size_t cwcWinPath)
{
    /* Check length and allocate memory for it. */
    int rc;
    if (cwcWinPath < _32K - 1)
    {

        size_t const cwcExtraPrefix =    RT_MAKE_U64(RTNtCurrentPeb()->OSMinorVersion, RTNtCurrentPeb()->OSMajorVersion)
                                      >= RT_MAKE_U64(0, 4)
                                    ? 0 : sizeof(g_szPrefixNt3x) - 1 - 4;
        PRTUTF16 pwszNtPath = (PRTUTF16)RTUtf16Alloc((cwcExtraPrefix + cwcWinPath + 1) * sizeof(RTUTF16));
        if (pwszNtPath)
        {
            /* Intialize the path. */
            if (!cwcExtraPrefix)
            {
                pwszNtPath[0] = '\\';
                pwszNtPath[1] = '?';
                pwszNtPath[2] = '?';
                pwszNtPath[3] = '\\';
            }
            else
                for (uint32_t i = 0; i < sizeof(g_szPrefixNt3x) - 1; i++)
                    pwszNtPath[i] = g_szPrefixNt3x[i];
            memcpy(pwszNtPath + cwcExtraPrefix + 4, pwszWinPath + 4, (cwcWinPath - 4) * sizeof(RTUTF16));
            pwszNtPath[cwcExtraPrefix + cwcWinPath] = '\0';

            /* Initialize the return values. */
            pNtName->Buffer = pwszNtPath;
            pNtName->Length = (uint16_t)(cwcExtraPrefix + cwcWinPath * sizeof(RTUTF16));
            pNtName->MaximumLength = pNtName->Length + sizeof(RTUTF16);
            *phRootDir = NULL;

            rc = VINF_SUCCESS;
        }
        else
            rc = VERR_NO_UTF16_MEMORY;
    }
    else
        rc = VERR_FILENAME_TOO_LONG;
    return rc;
}





/**
 * Converts the path to UTF-16 and sets all the return values.
 *
 * @returns IPRT status code.
 * @param   pNtName             Where to return the NT name.
 * @param   phRootDir           Where to return the root handle, if applicable.
 * @param   pszPath             The UTF-8 path.
 */
static int rtNtPathUtf8ToUniStr(struct _UNICODE_STRING *pNtName, PHANDLE phRootDir, const char *pszPath)
{
    PRTUTF16 pwszPath = NULL;
    size_t   cwcLen;
    int rc = RTStrToUtf16Ex(pszPath, RTSTR_MAX, &pwszPath, 0, &cwcLen);
    if (RT_SUCCESS(rc))
    {
        if (cwcLen < _32K - 1)
        {
            pNtName->Buffer = pwszPath;
            pNtName->Length = (uint16_t)(cwcLen * sizeof(RTUTF16));
            pNtName->MaximumLength = pNtName->Length + sizeof(RTUTF16);
            *phRootDir = NULL;
            return VINF_SUCCESS;
        }

        RTUtf16Free(pwszPath);
        rc = VERR_FILENAME_TOO_LONG;
    }
    return rc;
}


/**
 * Converts a windows-style path to NT format and encoding.
 *
 * @returns IPRT status code.
 * @param   pNtName             Where to return the NT name.  Free using
 *                              rtTNtPathToNative.
 * @param   phRootDir           Where to return the root handle, if applicable.
 * @param   pszPath             The UTF-8 path.
 */
static int rtNtPathToNative(struct _UNICODE_STRING *pNtName, PHANDLE phRootDir, const char *pszPath)
{
/** @todo This code sucks a bit performance wise, esp. calling
 *        generic RTPathAbs.  Too many buffers involved, I think. */

    /*
     * Very simple conversion of a win32-like path into an NT path.
     */
    const char *pszPrefix;
    size_t      cchPrefix;
    if (RT_MAKE_U64(RTNtCurrentPeb()->OSMinorVersion, RTNtCurrentPeb()->OSMajorVersion) >= RT_MAKE_U64(0, 4))
    {
        pszPrefix = g_szPrefix;
        cchPrefix = sizeof(g_szPrefix) - 1;
    }
    else
    {
        pszPrefix = g_szPrefixNt3x;
        cchPrefix = sizeof(g_szPrefixNt3x) - 1;
    }

    size_t      cchSkip   = 0;
    if (   RTPATH_IS_SLASH(pszPath[0])
        && RTPATH_IS_SLASH(pszPath[1])
        && !RTPATH_IS_SLASH(pszPath[2])
        && pszPath[2])
    {
#ifdef IPRT_WITH_NT_PATH_PASSTHRU
        /*
         * Special trick: The path starts with RTPATH_NT_PASSTHRU_PREFIX, we will skip past the bang and pass it thru.
         */
        if (   pszPath[2] == ':'
            && pszPath[3] == 'i'
            && pszPath[4] == 'p'
            && pszPath[5] == 'r'
            && pszPath[6] == 't'
            && pszPath[7] == 'n'
            && pszPath[8] == 't'
            && pszPath[9] == ':'
            && RTPATH_IS_SLASH(pszPath[10]))
            return rtNtPathUtf8ToUniStr(pNtName, phRootDir, pszPath + 10);
#endif

        if (   pszPath[2] == '?'
            && RTPATH_IS_SLASH(pszPath[3]))
            return rtNtPathFromWinUtf8PassThru(pNtName, phRootDir, pszPath);

        if (   pszPath[2] == '.'
            && RTPATH_IS_SLASH(pszPath[3]))
        {
            /*
             * Device path.
             * Note! I suspect \\.\stuff\..\otherstuff may be handled differently by windows.
             */
            cchSkip   = 4;
        }
        else
        {
            /* UNC */
            if (RT_MAKE_U64(RTNtCurrentPeb()->OSMinorVersion, RTNtCurrentPeb()->OSMajorVersion) >= RT_MAKE_U64(0, 4))
            {
                pszPrefix = g_szPrefixUnc;
                cchPrefix = sizeof(g_szPrefixUnc) - 1;
            }
            else
            {
                pszPrefix = g_szPrefixNt3xUnc;
                cchPrefix = sizeof(g_szPrefixNt3xUnc) - 1;
            }
            cchSkip   = 2;
        }
    }

    /*
     * Straighten out all .. and uncessary . references and convert slashes.
     */
    char    szAbsPathBuf[RTPATH_MAX];
    size_t  cbAbsPath      = sizeof(szAbsPathBuf) - (cchPrefix - cchSkip);
    char   *pszAbsPath     = szAbsPathBuf;
    char   *pszAbsPathFree = NULL;
    int rc = RTPathAbsEx(NULL, pszPath, RTPATH_STR_F_STYLE_DOS, &pszAbsPath[cchPrefix - cchSkip], &cbAbsPath);
    if (RT_SUCCESS(rc))
    { /* likely */ }
    else if (rc == VERR_BUFFER_OVERFLOW)
    {
        unsigned cTries       = 8;
        size_t   cbAbsPathBuf = RTPATH_MAX;
        for (;;)
        {
            cbAbsPathBuf = RT_MAX(RT_ALIGN_Z((cchPrefix - cchSkip) + cbAbsPath + 32, 64), cbAbsPathBuf + 256);
            if (cTries == 1)
                cbAbsPathBuf = RT_MAX(cbAbsPathBuf, RTPATH_BIG_MAX * 2);
            pszAbsPathFree = pszAbsPath = (char *)RTMemTmpAlloc(cbAbsPathBuf);
            if (!pszAbsPath)
                return VERR_NO_TMP_MEMORY;

            cbAbsPath = cbAbsPathBuf - (cchPrefix - cchSkip);
            rc = RTPathAbsEx(NULL, pszPath, RTPATH_STR_F_STYLE_DOS, &pszAbsPath[cchPrefix - cchSkip], &cbAbsPath);
            if (RT_SUCCESS(rc))
                break;
            RTMemTmpFree(pszAbsPathFree);
            pszAbsPathFree = NULL;
            if (rc != VERR_BUFFER_OVERFLOW)
                return rc;
            if (--cTries == 0)
                return VERR_FILENAME_TOO_LONG;
        }
    }
    else
        return rc;

    /*
     * Add prefix and convert it to UTF16.
     */
    memcpy(pszAbsPath, pszPrefix, cchPrefix);
    rc = rtNtPathUtf8ToUniStr(pNtName, phRootDir, pszAbsPath);

    if (pszAbsPathFree)
        RTMemTmpFree(pszAbsPathFree);
    return rc;
}


/**
 * Converts a windows-style path to NT format and encoding.
 *
 * @returns IPRT status code.
 * @param   pNtName             Where to return the NT name.  Free using
 *                              RTNtPathToNative.
 * @param   phRootDir           Where to return the root handle, if applicable.
 * @param   pszPath             The UTF-8 path.
 */
RTDECL(int) RTNtPathFromWinUtf8(struct _UNICODE_STRING *pNtName, PHANDLE phRootDir, const char *pszPath)
{
    return rtNtPathToNative(pNtName, phRootDir, pszPath);
}


/**
 * Converts a UTF-16 windows-style path to NT format.
 *
 * @returns IPRT status code.
 * @param   pNtName             Where to return the NT name.  Free using
 *                              RTNtPathFree.
 * @param   phRootDir           Where to return the root handle, if applicable.
 * @param   pwszWinPath         The UTF-16 windows-style path.
 * @param   cwcWinPath          The max length of the windows-style path in
 *                              RTUTF16 units.  Use RTSTR_MAX if unknown and @a
 *                              pwszWinPath is correctly terminated.
 */
RTDECL(int) RTNtPathFromWinUtf16Ex(struct _UNICODE_STRING *pNtName, HANDLE *phRootDir, PCRTUTF16 pwszWinPath, size_t cwcWinPath)
{
    /*
     * Validate the input, calculating the correct length.
     */
    if (cwcWinPath == 0 || *pwszWinPath == '\0')
        return VERR_INVALID_NAME;

    RTUtf16NLenEx(pwszWinPath, cwcWinPath, &cwcWinPath);
    int rc = RTUtf16ValidateEncodingEx(pwszWinPath, cwcWinPath, 0);
    if (RT_FAILURE(rc))
        return rc;

    /*
     * Very simple conversion of a win32-like path into an NT path.
     */
    const char *pszPrefix = g_szPrefix;
    size_t      cchPrefix = sizeof(g_szPrefix) - 1;
    size_t      cchSkip   = 0;

    if (   RTPATH_IS_SLASH(pwszWinPath[0])
        && cwcWinPath >= 3
        && RTPATH_IS_SLASH(pwszWinPath[1])
        && !RTPATH_IS_SLASH(pwszWinPath[2]) )
    {
#ifdef IPRT_WITH_NT_PATH_PASSTHRU
        /*
         * Special trick: The path starts with RTPATH_NT_PASSTHRU_PREFIX, we will skip past the bang and pass it thru.
         */
        if (   cwcWinPath >= sizeof(RTPATH_NT_PASSTHRU_PREFIX) - 1U
            && pwszWinPath[2] == ':'
            && pwszWinPath[3] == 'i'
            && pwszWinPath[4] == 'p'
            && pwszWinPath[5] == 'r'
            && pwszWinPath[6] == 't'
            && pwszWinPath[7] == 'n'
            && pwszWinPath[8] == 't'
            && pwszWinPath[9] == ':'
            && RTPATH_IS_SLASH(pwszWinPath[10]) )
        {
            pwszWinPath += 10;
            cwcWinPath  -= 10;
            if (cwcWinPath < _32K - 1)
            {
                PRTUTF16 pwszNtPath = RTUtf16Alloc((cwcWinPath + 1) * sizeof(RTUTF16));
                if (pwszNtPath)
                {
                    memcpy(pwszNtPath, pwszWinPath, cwcWinPath * sizeof(RTUTF16));
                    pwszNtPath[cwcWinPath] = '\0';
                    pNtName->Buffer = pwszNtPath;
                    pNtName->Length = (uint16_t)(cwcWinPath * sizeof(RTUTF16));
                    pNtName->MaximumLength = pNtName->Length + sizeof(RTUTF16);
                    *phRootDir = NULL;
                    return VINF_SUCCESS;
                }
                rc = VERR_NO_UTF16_MEMORY;
            }
            else
                rc = VERR_FILENAME_TOO_LONG;
            return rc;
        }
#endif

        if (   pwszWinPath[2] == '?'
            && cwcWinPath >= 4
            && RTPATH_IS_SLASH(pwszWinPath[3]))
            return rtNtPathFromWinUtf16PassThru(pNtName, phRootDir, pwszWinPath, cwcWinPath);

        if (   pwszWinPath[2] == '.'
            && cwcWinPath >= 4
            && RTPATH_IS_SLASH(pwszWinPath[3]))
        {
            /*
             * Device path.
             * Note! I suspect \\.\stuff\..\otherstuff may be handled differently by windows.
             */
            cchSkip   = 4;
        }
        else
        {
            /* UNC */
            pszPrefix = g_szPrefixUnc;
            cchPrefix = sizeof(g_szPrefixUnc) - 1;
            cchSkip   = 2;
        }
    }

    /*
     * Straighten out all .. and unnecessary . references and convert slashes.
     */
    /* UTF-16 -> UTF-8 (relative path) */
    char   szRelPath[RTPATH_MAX];
    char  *pszRelPathFree = NULL;
    char  *pszRelPath = szRelPath;
    size_t cchRelPath;
    rc = RTUtf16ToUtf8Ex(pwszWinPath, cwcWinPath, &pszRelPath, sizeof(szRelPath), &cchRelPath);
    if (RT_SUCCESS(rc))
    { /* likely */ }
    else if (rc == VERR_BUFFER_OVERFLOW)
    {
        pszRelPath = NULL;
        rc = RTUtf16ToUtf8Ex(pwszWinPath, cwcWinPath, &pszRelPath, 0, &cchRelPath);
        if (RT_SUCCESS(rc))
            pszRelPathFree = pszRelPath;
    }
    if (RT_SUCCESS(rc))
    {
        /* Relative -> Absolute. */
        char   szAbsPathBuf[RTPATH_MAX];
        char  *pszAbsPathFree = NULL;
        char  *pszAbsPath     = szAbsPathBuf;
        size_t cbAbsPath      = sizeof(szAbsPathBuf) - (cchPrefix - cchSkip);
        rc = RTPathAbsEx(NULL, szRelPath, RTPATH_STR_F_STYLE_DOS, &pszAbsPath[cchPrefix - cchSkip], &cbAbsPath);
        if (RT_SUCCESS(rc))
        { /* likely */ }
        else if (rc == VERR_BUFFER_OVERFLOW)
        {
            unsigned cTries = 8;
            size_t   cbAbsPathBuf = RTPATH_MAX;
            for (;;)
            {
                cbAbsPathBuf = RT_MAX(RT_ALIGN_Z((cchPrefix - cchSkip) + cbAbsPath + 32, 64), cbAbsPathBuf + 256);
                if (cTries == 1)
                    cbAbsPathBuf = RT_MAX(cbAbsPathBuf, RTPATH_BIG_MAX * 2);
                pszAbsPathFree = pszAbsPath = (char *)RTMemTmpAlloc(cbAbsPathBuf);
                if (!pszAbsPath)
                {
                    rc = VERR_NO_TMP_MEMORY;
                    break;
                }

                cbAbsPath = cbAbsPathBuf - (cchPrefix - cchSkip);
                rc = RTPathAbsEx(NULL, szRelPath, RTPATH_STR_F_STYLE_DOS, &pszAbsPath[cchPrefix - cchSkip], &cbAbsPath);
                if (RT_SUCCESS(rc))
                    break;

                RTMemTmpFree(pszAbsPathFree);
                pszAbsPathFree = NULL;
                if (rc != VERR_BUFFER_OVERFLOW)
                    break;
                if (--cTries == 0)
                {
                    rc = VERR_FILENAME_TOO_LONG;
                    break;
                }
            }

        }
        if (pszRelPathFree)
            RTStrFree(pszRelPathFree);

        if (RT_SUCCESS(rc))
        {
            /*
             * Add prefix
             */
            memcpy(pszAbsPath, pszPrefix, cchPrefix);

            /*
             * Remove trailing '.' that is used to specify no extension in the Win32/DOS world.
             */
            size_t cchAbsPath = strlen(pszAbsPath);
            if (   cchAbsPath > 2
                && pszAbsPath[cchAbsPath - 1] == '.')
            {
                char const ch = pszAbsPath[cchAbsPath - 2];
                if (   ch != '/'
                    && ch != '\\'
                    && ch != ':'
                    && ch != '.')
                    pszAbsPath[--cchAbsPath] = '\0';
            }

            /*
             * Finally convert to UNICODE_STRING.
             */
            rc = rtNtPathUtf8ToUniStr(pNtName, phRootDir, pszAbsPath);

            if (pszAbsPathFree)
                RTMemTmpFree(pszAbsPathFree);
        }
    }
    return rc;
}


/**
 * Ensures that the NT string has sufficient storage to hold @a cwcMin RTUTF16
 * chars plus a terminator.
 *
 * The NT string must have been returned by RTNtPathFromWinUtf8 or
 * RTNtPathFromWinUtf16Ex.
 *
 * @returns IPRT status code.
 * @param   pNtName             The NT path string.
 * @param   cwcMin              The minimum number of RTUTF16 chars. Max 32767.
 * @sa      RTNtPathFree
 */
RTDECL(int) RTNtPathEnsureSpace(struct _UNICODE_STRING *pNtName, size_t cwcMin)
{
    if (pNtName->MaximumLength / sizeof(RTUTF16) > cwcMin)
        return VINF_SUCCESS;

    AssertReturn(cwcMin < _64K / sizeof(RTUTF16), VERR_OUT_OF_RANGE);

    size_t const cbMin = (cwcMin + 1) * sizeof(RTUTF16);
    int rc = RTUtf16Realloc(&pNtName->Buffer, cbMin);
    if (RT_SUCCESS(rc))
        pNtName->MaximumLength = (uint16_t)cbMin;
    return rc;
}


/**
 * Gets the NT path to the object represented by the given handle.
 *
 * @returns IPRT status code.
 * @param   pNtName             Where to return the NT path.  Free using
 *                              RTNtPathFree.
 * @param   hHandle             The handle.
 * @param   cwcExtra            How much extra space is needed.
 */
RTDECL(int) RTNtPathFromHandle(struct _UNICODE_STRING *pNtName, HANDLE hHandle, size_t cwcExtra)
{
    /*
     * Query the name into a buffer.
     */
    ULONG cbBuf = _2K;
    PUNICODE_STRING pUniStrBuf = (PUNICODE_STRING)RTMemTmpAllocZ(cbBuf);
    if (!pUniStrBuf)
        return VERR_NO_TMP_MEMORY;

    ULONG cbNameBuf = cbBuf;
    NTSTATUS rcNt = NtQueryObject(hHandle, ObjectNameInformation, pUniStrBuf, cbBuf, &cbNameBuf);
    while (   rcNt == STATUS_BUFFER_OVERFLOW
           || rcNt == STATUS_BUFFER_TOO_SMALL)
    {
        do
            cbBuf *= 2;
        while (cbBuf <= cbNameBuf);
        RTMemTmpFree(pUniStrBuf);
        pUniStrBuf = (PUNICODE_STRING)RTMemTmpAllocZ(cbBuf);
        if (!pUniStrBuf)
            return VERR_NO_TMP_MEMORY;

        cbNameBuf = cbBuf;
        rcNt = NtQueryObject(hHandle, ObjectNameInformation, pUniStrBuf, cbBuf, &cbNameBuf);
    }
    int rc;
    if (NT_SUCCESS(rcNt))
    {
        /*
         * Copy the result into the return string.
         */
        size_t cbNeeded = cwcExtra * sizeof(RTUTF16) + pUniStrBuf->Length + sizeof(RTUTF16);
        if (cbNeeded < _64K)
        {
            pNtName->Length        = pUniStrBuf->Length;
            pNtName->MaximumLength = (uint16_t)cbNeeded;
            pNtName->Buffer        = RTUtf16Alloc(cbNeeded);
            if (pNtName->Buffer)
            {
                memcpy(pNtName->Buffer, pUniStrBuf->Buffer, pUniStrBuf->Length);
                pNtName->Buffer[pUniStrBuf->Length / sizeof(RTUTF16)] = '\0';
                rc = VINF_SUCCESS;
            }
            else
                rc = VERR_NO_UTF16_MEMORY;
        }
        else
            rc = VERR_FILENAME_TOO_LONG;
    }
    else
        rc = RTErrConvertFromNtStatus(rcNt);
    RTMemTmpFree(pUniStrBuf);
    return rc;
}

static int rtNtPathRelativeToAbs(struct _UNICODE_STRING *pNtName, HANDLE *phRootDir)
{
    int rc;
    if (pNtName->Length == 0)
    {
        RTUtf16Free(pNtName->Buffer);
        rc = RTNtPathFromHandle(pNtName, *phRootDir, pNtName->Length / sizeof(RTUTF16) + 2);
        if (RT_SUCCESS(rc))
        {
            *phRootDir = NULL;
            return VINF_SUCCESS;
        }
    }
    else
    {

        UNICODE_STRING RootDir;
        size_t const   cwcAppend = pNtName->Length / sizeof(RTUTF16);
        rc = RTNtPathFromHandle(&RootDir, *phRootDir, cwcAppend + 2);
        if (RT_SUCCESS(rc))
        {
            size_t cwcRoot = RootDir.Length / sizeof(RTUTF16);
            if (RootDir.Buffer[cwcRoot - 1] != '\\')
                RootDir.Buffer[cwcRoot++] = '\\';
            memcpy(&RootDir.Buffer[cwcRoot], pNtName->Buffer, cwcAppend * sizeof(RTUTF16));
            RTUtf16Free(pNtName->Buffer);
            pNtName->Length        = (uint16_t)((cwcRoot + cwcAppend) * sizeof(RTUTF16));
            pNtName->MaximumLength = RootDir.MaximumLength;
            pNtName->Buffer        = RootDir.Buffer;

            *phRootDir = NULL;
            return VINF_SUCCESS;
        }
        RTUtf16Free(pNtName->Buffer);
    }
    pNtName->Length        = 0;
    pNtName->MaximumLength = 0;
    pNtName->Buffer        = NULL;
    return rc;
}


/**
 * Rewinds the path back to the start of the previous component.
 *
 * Will preserve root slash.
 *
 * @returns Pointer to character after the start-of-component slash, or
 *          pwszStart.
 * @param   pwcEnd              The current end of the path.
 * @param   pwszStart           The start of the path.
 */
static PRTUTF16 rtNtPathGetPrevComponent(PRTUTF16 pwcEnd, PRTUTF16 pwszStart)
{
    if ((uintptr_t)pwcEnd > (uintptr_t)pwszStart)
    {
        RTUTF16 wc = pwcEnd[-1];
        if (   (wc == '\\' || wc == '/')
            && (uintptr_t)(pwcEnd - pwszStart) != 1)
            pwcEnd--;

        while (   (uintptr_t)pwcEnd > (uintptr_t)pwszStart
               && (wc = pwcEnd[-1]) != '\\'
               && (wc = pwcEnd[-1]) != '/')
            pwcEnd--;
    }
    return pwcEnd;
}


/**
 * Converts a relative windows-style path to relative NT format and encoding.
 *
 * @returns IPRT status code.
 * @param   pNtName             Where to return the NT name.  Free using
 *                              rtTNtPathToNative with phRootDir set to NULL.
 * @param   phRootDir           On input, the handle to the directory the path
 *                              is relative to.  On output, the handle to
 *                              specify as root directory in the object
 *                              attributes when accessing the path.  If
 *                              enmAscent is kRTNtPathRelativeAscent_Allow, it
 *                              may have been set to NULL.
 * @param   pszPath             The relative UTF-8 path.
 * @param   enmAscent           How to handle ascent.
 * @param   fMustReturnAbsolute Must convert to an absolute path.  This
 *                              is necessary if the root dir is a NT directory
 *                              object (e.g. /Devices) since they cannot parse
 *                              relative paths it seems.
 */
RTDECL(int) RTNtPathRelativeFromUtf8(struct _UNICODE_STRING *pNtName, PHANDLE phRootDir, const char *pszPath,
                                     RTNTPATHRELATIVEASCENT enmAscent, bool fMustReturnAbsolute)
{
    size_t cwcMax;
    int rc = RTStrCalcUtf16LenEx(pszPath, RTSTR_MAX, &cwcMax);
    if (RT_FAILURE(rc))
        return rc;
    if (cwcMax + 2 >= _32K)
        return VERR_FILENAME_TOO_LONG;

    PRTUTF16 pwszDst;
    pNtName->Length        = 0;
    pNtName->MaximumLength = (uint16_t)((cwcMax + 2) * sizeof(RTUTF16));
    pNtName->Buffer        = pwszDst = RTUtf16Alloc((cwcMax + 2) * sizeof(RTUTF16));
    if (!pwszDst)
        return VERR_NO_UTF16_MEMORY;

    PRTUTF16 pwszDstCur  = pwszDst;
    PRTUTF16 pwszDstComp = pwszDst;
    for (;;)
    {
        RTUNICP uc;
        rc = RTStrGetCpEx(&pszPath, &uc);
        if (RT_SUCCESS(rc))
        {
            switch (uc)
            {
                default:
                    pwszDstCur = RTUtf16PutCp(pwszDstCur, uc);
                    break;

                case '\\':
                case '/':
                    if (pwszDstCur != pwszDstComp)
                        pwszDstComp = pwszDstCur = RTUtf16PutCp(pwszDstCur, '\\');
                    /* else: only one slash between components. */
                    break;

                case '.':
                    if (pwszDstCur == pwszDstComp)
                    {
                        /*
                         * Single dot changes nothing.
                         */
                        char ch2 = *pszPath;
                        if (ch2 == '\0')
                        {
                            /* Trailing single dot means we need to drop trailing slash. */
                            if (pwszDstCur != pwszDst)
                                pwszDstCur--;
                            *pwszDstCur = '\0';
                            pNtName->Length = (uint16_t)((uintptr_t)pwszDstCur - (uintptr_t)pwszDst);
                            if (!fMustReturnAbsolute || *phRootDir == NULL)
                                return VINF_SUCCESS;
                            return rtNtPathRelativeToAbs(pNtName, phRootDir);
                        }

                        if (ch2 == '\\' || ch2 == '/')
                        {
                            pszPath++; /* Ignore lone dot followed but another component. */
                            break;
                        }

                        /*
                         * Two dots drops off the last directory component.  This gets complicated
                         * when we start out without any path and we need to consult enmAscent.
                         */
                        if (ch2 == '.')
                        {
                            char ch3 = pszPath[1];
                            if (   ch3 == '\\'
                                || ch3 == '/'
                                || ch3 == '\0')
                            {
                                /* Drop a path component. */
                                if (pwszDstComp != pwszDst)
                                    pwszDstComp = pwszDstCur = rtNtPathGetPrevComponent(pwszDstCur, pwszDst);
                                /* Hit the start, which is a bit complicated. */
                                else
                                    switch (enmAscent)
                                    {
                                        case kRTNtPathRelativeAscent_Allow:
                                            if (*phRootDir != NULL)
                                            {
                                                RTUtf16Free(pwszDst);
                                                rc = RTNtPathFromHandle(pNtName, *phRootDir, cwcMax + 2);
                                                if (RT_FAILURE(rc))
                                                    return rc;

                                                *phRootDir = NULL;
                                                pwszDst    = pNtName->Buffer;
                                                pwszDstCur = &pwszDst[pNtName->Length / sizeof(RTUTF16)];
                                                if (   pwszDst != pwszDstCur
                                                    && pwszDstCur[-1] != '\\'
                                                    && pwszDstCur[-1] != '/')
                                                    *pwszDstCur++ = '\\';
                                                pwszDstComp = pwszDstCur = rtNtPathGetPrevComponent(pwszDstCur, pwszDst);
                                            }
                                            /* else: ignore attempt to ascend beyond the NT root (won't get here). */
                                            break;

                                        case kRTNtPathRelativeAscent_Ignore:
                                            /* nothing to do here */
                                            break;

                                        default:
                                        case kRTNtPathRelativeAscent_Fail:
                                            RTUtf16Free(pwszDst);
                                            return VERR_PATH_NOT_FOUND;
                                    }

                                if (ch3 == '\0')
                                {
                                    *pwszDstCur = '\0';
                                    pNtName->Length = (uint16_t)((uintptr_t)pwszDstCur - (uintptr_t)pwszDst);
                                    if (!fMustReturnAbsolute || *phRootDir == NULL)
                                        return VINF_SUCCESS;
                                    return rtNtPathRelativeToAbs(pNtName, phRootDir);
                                }
                                pszPath += 2;
                                break;
                            }
                        }
                    }

                    /* Neither '.' nor '..'. */
                    pwszDstCur = RTUtf16PutCp(pwszDstCur, '.');
                    break;

                case '\0':
                    *pwszDstCur = '\0';
                    pNtName->Length = (uint16_t)((uintptr_t)pwszDstCur - (uintptr_t)pwszDst);
                    if (!fMustReturnAbsolute || *phRootDir == NULL)
                        return VINF_SUCCESS;
                    return rtNtPathRelativeToAbs(pNtName, phRootDir);
            }
        }
    }
}


/**
 * Frees the native path and root handle.
 *
 * @param   pNtName             The NT path after a successful rtNtPathToNative
 *                              call or RTNtPathRelativeFromUtf8.
 * @param   phRootDir           The root handle variable from rtNtPathToNative,
 *                              but NOT RTNtPathRelativeFromUtf8.
 */
static void rtNtPathFreeNative(struct _UNICODE_STRING *pNtName, PHANDLE phRootDir)
{
    RTUtf16Free(pNtName->Buffer);
    pNtName->Buffer = NULL;

    RT_NOREF_PV(phRootDir); /* never returned by rtNtPathToNative, shouldn't be freed in connection with RTNtPathRelativeFromUtf8 */
}


/**
 * Frees the native path and root handle.
 *
 * @param   pNtName             The NT path after a successful rtNtPathToNative
 *                              call or RTNtPathRelativeFromUtf8.
 * @param   phRootDir           The root handle variable from rtNtPathToNative,
 */
RTDECL(void) RTNtPathFree(struct _UNICODE_STRING *pNtName, HANDLE *phRootDir)
{
    rtNtPathFreeNative(pNtName, phRootDir);
}


/**
 * Wrapper around NtCreateFile.
 *
 * @returns IPRT status code.
 * @param   pszPath             The UTF-8 path.
 * @param   fDesiredAccess      See NtCreateFile.
 * @param   fFileAttribs        See NtCreateFile.
 * @param   fShareAccess        See NtCreateFile.
 * @param   fCreateDisposition  See NtCreateFile.
 * @param   fCreateOptions      See NtCreateFile.
 * @param   fObjAttribs         The OBJECT_ATTRIBUTES::Attributes value, see
 *                              NtCreateFile and InitializeObjectAttributes.
 * @param   phHandle            Where to return the handle.
 * @param   puAction            Where to return the action taken. Optional.
 */
RTDECL(int) RTNtPathOpen(const char *pszPath, ACCESS_MASK fDesiredAccess, ULONG fFileAttribs, ULONG fShareAccess,
                         ULONG fCreateDisposition, ULONG fCreateOptions, ULONG fObjAttribs,
                         PHANDLE phHandle, PULONG_PTR puAction)
{
    *phHandle = RTNT_INVALID_HANDLE_VALUE;

    HANDLE         hRootDir;
    UNICODE_STRING NtName;
    int rc = rtNtPathToNative(&NtName, &hRootDir, pszPath);
    if (RT_SUCCESS(rc))
    {
        HANDLE              hFile = RTNT_INVALID_HANDLE_VALUE;
        IO_STATUS_BLOCK     Ios   = RTNT_IO_STATUS_BLOCK_INITIALIZER;
        OBJECT_ATTRIBUTES   ObjAttr;
        InitializeObjectAttributes(&ObjAttr, &NtName, fObjAttribs, hRootDir, NULL);

        NTSTATUS rcNt = NtCreateFile(&hFile,
                                     fDesiredAccess,
                                     &ObjAttr,
                                     &Ios,
                                     NULL /* AllocationSize*/,
                                     fFileAttribs,
                                     fShareAccess,
                                     fCreateDisposition,
                                     fCreateOptions,
                                     NULL /*EaBuffer*/,
                                     0 /*EaLength*/);
        if (NT_SUCCESS(rcNt))
        {
            if (puAction)
                *puAction = Ios.Information;
            *phHandle = hFile;
            rc = VINF_SUCCESS;
        }
        else
            rc = RTErrConvertFromNtStatus(rcNt);
        rtNtPathFreeNative(&NtName, &hRootDir);
    }
    return rc;
}


/**
 * Wrapper around NtCreateFile.
 *
 * @returns IPRT status code.
 * @param   pszPath             The UTF-8 path.
 * @param   fDesiredAccess      See NtCreateFile.
 * @param   fShareAccess        See NtCreateFile.
 * @param   fCreateOptions      See NtCreateFile.
 * @param   fObjAttribs         The OBJECT_ATTRIBUTES::Attributes value, see
 *                              NtCreateFile and InitializeObjectAttributes.
 * @param   phHandle            Where to return the handle.
 * @param   pfObjDir            If not NULL, the variable pointed to will be set
 *                              to @c true if we opened an object directory and
 *                              @c false if we opened an directory file (normal
 *                              directory).
 */
RTDECL(int) RTNtPathOpenDir(const char *pszPath, ACCESS_MASK fDesiredAccess, ULONG fShareAccess, ULONG fCreateOptions,
                            ULONG fObjAttribs, PHANDLE phHandle, bool *pfObjDir)
{
    *phHandle = RTNT_INVALID_HANDLE_VALUE;

    HANDLE         hRootDir;
    UNICODE_STRING NtName;
    int rc = rtNtPathToNative(&NtName, &hRootDir, pszPath);
    if (RT_SUCCESS(rc))
    {
        if (pfObjDir)
        {
            *pfObjDir = false;
#ifdef IPRT_WITH_NT_PATH_PASSTHRU
            if (   !RTPATH_IS_SLASH(pszPath[0])
                || !RTPATH_IS_SLASH(pszPath[1])
                || pszPath[2] != ':'
                || pszPath[3] != 'i'
                || pszPath[4] != 'p'
                || pszPath[5] != 'r'
                || pszPath[6] != 't'
                || pszPath[7] != 'n'
                || pszPath[8] != 't'
                || pszPath[9] != ':'
                || !RTPATH_IS_SLASH(pszPath[10]) )
#endif
                pfObjDir = NULL;
        }
        rc = RTNtPathOpenDirEx(hRootDir, &NtName, fDesiredAccess, fShareAccess, fCreateOptions, fObjAttribs, phHandle, pfObjDir);
        rtNtPathFreeNative(&NtName, &hRootDir);
    }
    return rc;
}



/**
 * Wrapper around NtCreateFile, extended version.
 *
 * @returns IPRT status code.
 * @param   hRootDir            The root director the path is relative to.  NULL
 *                              if none.
 * @param   pNtName             The NT path.
 * @param   fDesiredAccess      See NtCreateFile.
 * @param   fShareAccess        See NtCreateFile.
 * @param   fCreateOptions      See NtCreateFile.
 * @param   fObjAttribs         The OBJECT_ATTRIBUTES::Attributes value, see
 *                              NtCreateFile and InitializeObjectAttributes.
 * @param   phHandle            Where to return the handle.
 * @param   pfObjDir            If not NULL, the variable pointed to will be set
 *                              to @c true if we opened an object directory and
 *                              @c false if we opened an directory file (normal
 *                              directory).
 */
RTDECL(int) RTNtPathOpenDirEx(HANDLE hRootDir, struct _UNICODE_STRING *pNtName, ACCESS_MASK fDesiredAccess, ULONG fShareAccess,
                              ULONG fCreateOptions, ULONG fObjAttribs, PHANDLE phHandle, bool *pfObjDir)
{
    *phHandle = RTNT_INVALID_HANDLE_VALUE;

    HANDLE              hFile = RTNT_INVALID_HANDLE_VALUE;
    IO_STATUS_BLOCK     Ios   = RTNT_IO_STATUS_BLOCK_INITIALIZER;
    OBJECT_ATTRIBUTES   ObjAttr;
    InitializeObjectAttributes(&ObjAttr, pNtName, fObjAttribs, hRootDir, NULL);

    NTSTATUS rcNt = NtCreateFile(&hFile,
                                 fDesiredAccess,
                                 &ObjAttr,
                                 &Ios,
                                 NULL /* AllocationSize*/,
                                 FILE_ATTRIBUTE_NORMAL,
                                 fShareAccess,
                                 FILE_OPEN,
                                 fCreateOptions,
                                 NULL /*EaBuffer*/,
                                 0 /*EaLength*/);
    if (NT_SUCCESS(rcNt))
    {
        if (pfObjDir)
            *pfObjDir = false;
        *phHandle = hFile;
        return VINF_SUCCESS;
    }

    /*
     * Try add a slash in case this is a device object with a file system attached.
     */
    if (   rcNt == STATUS_INVALID_PARAMETER
        && pNtName->Length < _64K - 4
        && (   pNtName->Length == 0
            || pNtName->Buffer[pNtName->Length / sizeof(RTUTF16)] != '\\') )
    {
        UNICODE_STRING NtTmp;
        NtTmp.Length        = pNtName->Length + 2;
        NtTmp.MaximumLength = NtTmp.Length + 2;
        NtTmp.Buffer        = (PRTUTF16)RTMemTmpAlloc(NtTmp.MaximumLength);
        if (NtTmp.Buffer)
        {
            memcpy(NtTmp.Buffer, pNtName->Buffer, pNtName->Length);
            NtTmp.Buffer[pNtName->Length / sizeof(RTUTF16)] = '\\';
            NtTmp.Buffer[pNtName->Length / sizeof(RTUTF16) + 1] = '\0';

            hFile = RTNT_INVALID_HANDLE_VALUE;
            Ios.Status = -1;
            Ios.Information = 0;
            ObjAttr.ObjectName = &NtTmp;

            rcNt = NtCreateFile(&hFile,
                                fDesiredAccess,
                                &ObjAttr,
                                &Ios,
                                NULL /* AllocationSize*/,
                                FILE_ATTRIBUTE_NORMAL,
                                fShareAccess,
                                FILE_OPEN,
                                fCreateOptions,
                                NULL /*EaBuffer*/,
                                0 /*EaLength*/);
            RTMemTmpFree(NtTmp.Buffer);
            if (NT_SUCCESS(rcNt))
            {
                if (pfObjDir)
                    *pfObjDir = false;
                *phHandle = hFile;
                return VINF_SUCCESS;
            }
            ObjAttr.ObjectName = pNtName;
        }
    }

    /*
     * Try open it as a directory object if it makes sense.
     */
    if (   pfObjDir
        && (   rcNt == STATUS_OBJECT_NAME_INVALID
            || rcNt == STATUS_OBJECT_TYPE_MISMATCH ))
    {
        /* Strip trailing slash. */
        struct _UNICODE_STRING NtName2 = *pNtName;
        if (   NtName2.Length > 2
            && RTPATH_IS_SLASH(NtName2.Buffer[(NtName2.Length / 2) - 1]))
            NtName2.Length -= 2;
        ObjAttr.ObjectName = &NtName2;

        /* Rought conversion of the access flags. */
        ULONG fObjDesiredAccess = 0;
        if (   (fDesiredAccess & GENERIC_ALL)
            || (fDesiredAccess & STANDARD_RIGHTS_ALL) == STANDARD_RIGHTS_ALL)
            fObjDesiredAccess = DIRECTORY_ALL_ACCESS;
        else
        {
            if (fDesiredAccess & (GENERIC_WRITE | STANDARD_RIGHTS_WRITE | FILE_WRITE_DATA))
                fObjDesiredAccess |= DIRECTORY_CREATE_OBJECT | DIRECTORY_CREATE_OBJECT | DIRECTORY_CREATE_SUBDIRECTORY;

            if (   (fDesiredAccess & (GENERIC_READ | STANDARD_RIGHTS_READ | FILE_LIST_DIRECTORY))
                || !fObjDesiredAccess)
                fObjDesiredAccess |= DIRECTORY_QUERY;

            if (fDesiredAccess & FILE_TRAVERSE)
                fObjDesiredAccess |= DIRECTORY_TRAVERSE;
        }

        rcNt = NtOpenDirectoryObject(&hFile, fObjDesiredAccess, &ObjAttr);
        if (NT_SUCCESS(rcNt))
        {
            *pfObjDir = true;
            *phHandle = hFile;
            return VINF_SUCCESS;
        }
    }

    return RTErrConvertFromNtStatus(rcNt);
}



/**
 * Closes an handled open by rtNtPathOpen.
 *
 * @returns IPRT status code
 * @param   hHandle             The handle value.
 */
RTDECL(int) RTNtPathClose(HANDLE hHandle)
{
    NTSTATUS rcNt = NtClose(hHandle);
    if (NT_SUCCESS(rcNt))
        return VINF_SUCCESS;
    return RTErrConvertFromNtStatus(rcNt);
}