summaryrefslogtreecommitdiffstats
path: root/toolkit/xre/nsXREDirProvider.cpp
blob: f2d0b1b0f2640fb0ce5f6947fd38c623311a73b3 (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
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsAppRunner.h"
#include "nsToolkitCompsCID.h"
#include "nsXREDirProvider.h"

#include "jsapi.h"
#include "xpcpublic.h"

#include "nsIAddonInterposition.h"
#include "nsIAppStartup.h"
#include "nsIDirectoryEnumerator.h"
#include "nsIFile.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsISimpleEnumerator.h"
#include "nsIToolkitChromeRegistry.h"
#include "nsIToolkitProfileService.h"
#include "nsIXULRuntime.h"

#include "nsAppDirectoryServiceDefs.h"
#include "nsDirectoryServiceDefs.h"
#include "nsDirectoryServiceUtils.h"
#include "nsXULAppAPI.h"
#include "nsCategoryManagerUtils.h"

#include "nsINIParser.h"
#include "nsDependentString.h"
#include "nsCOMArray.h"
#include "nsArrayEnumerator.h"
#include "nsEnumeratorUtils.h"
#include "nsReadableUtils.h"

#include "SpecialSystemDirectory.h"

#include "mozilla/dom/ScriptSettings.h"

#include "mozilla/Services.h"
#include "mozilla/Omnijar.h"
#include "mozilla/Preferences.h"
#include "mozilla/Telemetry.h"

#include <stdlib.h>

#ifdef XP_WIN
#include <windows.h>
#include <shlobj.h>
#endif
#ifdef XP_MACOSX
#include "nsILocalFileMac.h"
// for chflags()
#include <sys/stat.h>
#include <unistd.h>
#endif
#ifdef XP_UNIX
#include <ctype.h>
#endif
#ifdef XP_IOS
#include "UIKitDirProvider.h"
#endif

#if defined(XP_MACOSX)
#define APP_REGISTRY_NAME "Application Registry"
#elif defined(XP_WIN)
#define APP_REGISTRY_NAME "registry.dat"
#else
#define APP_REGISTRY_NAME "appreg"
#endif

#define PREF_OVERRIDE_DIRNAME "preferences"

static already_AddRefed<nsIFile>
CloneAndAppend(nsIFile* aFile, const char* name)
{
  nsCOMPtr<nsIFile> file;
  aFile->Clone(getter_AddRefs(file));
  file->AppendNative(nsDependentCString(name));
  return file.forget();
}

nsXREDirProvider* gDirServiceProvider = nullptr;

nsXREDirProvider::nsXREDirProvider() :
  mProfileNotified(false)
{
  gDirServiceProvider = this;
}

nsXREDirProvider::~nsXREDirProvider()
{
  gDirServiceProvider = nullptr;
}

nsXREDirProvider*
nsXREDirProvider::GetSingleton()
{
  return gDirServiceProvider;
}

nsresult
nsXREDirProvider::Initialize(nsIFile *aXULAppDir,
                             nsIFile *aGREDir,
                             nsIDirectoryServiceProvider* aAppProvider)
{
  NS_ENSURE_ARG(aXULAppDir);
  NS_ENSURE_ARG(aGREDir);

  mAppProvider = aAppProvider;
  mXULAppDir = aXULAppDir;
  mGREDir = aGREDir;
  mGREDir->Clone(getter_AddRefs(mGREBinDir));
#ifdef XP_MACOSX
  mGREBinDir->SetNativeLeafName(NS_LITERAL_CSTRING("MacOS"));
#endif

  if (!mProfileDir) {
    nsCOMPtr<nsIDirectoryServiceProvider> app(do_QueryInterface(mAppProvider));
    if (app) {
      bool per = false;
      app->GetFile(NS_APP_USER_PROFILE_50_DIR, &per, getter_AddRefs(mProfileDir));
      NS_ASSERTION(per, "NS_APP_USER_PROFILE_50_DIR must be persistent!");
      NS_ASSERTION(mProfileDir, "NS_APP_USER_PROFILE_50_DIR not defined! This shouldn't happen!");
    }
  }

  return NS_OK;
}

nsresult
nsXREDirProvider::SetProfile(nsIFile* aDir, nsIFile* aLocalDir)
{
  NS_ASSERTION(aDir && aLocalDir, "We don't support no-profile apps yet!");

  nsresult rv;

  rv = EnsureDirectoryExists(aDir);
  if (NS_FAILED(rv))
    return rv;

  rv = EnsureDirectoryExists(aLocalDir);
  if (NS_FAILED(rv))
    return rv;

#ifdef XP_MACOSX
  bool same;
  if (NS_SUCCEEDED(aDir->Equals(aLocalDir, &same)) && !same) {
    // Ensure that the cache directory is not indexed by Spotlight
    // (bug 718910).  At least on OS X, the cache directory (under
    // ~/Library/Caches/) is always the "local" user profile
    // directory.  This is confusing, since *both* user profile
    // directories are "local" (they both exist under the user's
    // home directory).  But this usage dates back at least as far
    // as the patch for bug 291033, where "local" seems to mean
    // "suitable for temporary storage".  Don't hide the cache
    // directory if by some chance it and the "non-local" profile
    // directory are the same -- there are bad side effects from
    // hiding a profile directory under /Library/Application Support/
    // (see bug 801883).
    nsAutoCString cacheDir;
    if (NS_SUCCEEDED(aLocalDir->GetNativePath(cacheDir))) {
      if (chflags(cacheDir.get(), UF_HIDDEN)) {
        NS_WARNING("Failed to set Cache directory to HIDDEN.");
      }
    }
  }
#endif

  mProfileDir = aDir;
  mProfileLocalDir = aLocalDir;
  return NS_OK;
}

NS_IMPL_QUERY_INTERFACE(nsXREDirProvider,
                        nsIDirectoryServiceProvider,
                        nsIDirectoryServiceProvider2,
                        nsIProfileStartup)

NS_IMETHODIMP_(MozExternalRefCountType)
nsXREDirProvider::AddRef()
{
  return 1;
}

NS_IMETHODIMP_(MozExternalRefCountType)
nsXREDirProvider::Release()
{
  return 0;
}

nsresult
nsXREDirProvider::GetUserProfilesRootDir(nsIFile** aResult,
                                         const nsACString* aProfileName,
                                         const nsACString* aAppName,
                                         const nsACString* aVendorName)
{
  nsCOMPtr<nsIFile> file;
  nsresult rv = GetUserDataDirectory(getter_AddRefs(file),
                                     false,
                                     aProfileName, aAppName, aVendorName);

  if (NS_SUCCEEDED(rv)) {
#if !defined(XP_UNIX) || defined(XP_MACOSX)
    rv = file->AppendNative(NS_LITERAL_CSTRING("Profiles"));
#endif
    // We must create the profile directory here if it does not exist.
    nsresult tmp = EnsureDirectoryExists(file);
    if (NS_FAILED(tmp)) {
      rv = tmp;
    }
  }
  file.swap(*aResult);
  return rv;
}

nsresult
nsXREDirProvider::GetUserProfilesLocalDir(nsIFile** aResult,
                                          const nsACString* aProfileName,
                                          const nsACString* aAppName,
                                          const nsACString* aVendorName)
{
  nsCOMPtr<nsIFile> file;
  nsresult rv = GetUserDataDirectory(getter_AddRefs(file),
                                     true,
                                     aProfileName, aAppName, aVendorName);

  if (NS_SUCCEEDED(rv)) {
#if !defined(XP_UNIX) || defined(XP_MACOSX)
    rv = file->AppendNative(NS_LITERAL_CSTRING("Profiles"));
#endif
    // We must create the profile directory here if it does not exist.
    nsresult tmp = EnsureDirectoryExists(file);
    if (NS_FAILED(tmp)) {
      rv = tmp;
    }
  }
  file.swap(*aResult);
  return NS_OK;
}

#if defined(XP_UNIX) || defined(XP_MACOSX)
/**
 * Get the directory that is the parent of the system-wide directories
 * for extensions and native-messaing manifests.
 *
 * On OSX this is /Library/Application Support/Mozilla
 * On Linux this is /usr/{lib,lib64}/mozilla
 *   (for 32- and 64-bit systems respsectively)
 */
static nsresult
GetSystemParentDirectory(nsIFile** aFile)
{
  nsresult rv;
  nsCOMPtr<nsIFile> localDir;
#if defined(XP_MACOSX)
  rv = GetOSXFolderType(kOnSystemDisk, kApplicationSupportFolderType, getter_AddRefs(localDir));
  if (NS_SUCCEEDED(rv)) {
    rv = localDir->AppendNative(NS_LITERAL_CSTRING("Mozilla"));
  }
#else
  NS_NAMED_LITERAL_CSTRING(dirname,
#ifdef HAVE_USR_LIB64_DIR
                           "/usr/lib64/mozilla"
#elif defined(__OpenBSD__) || defined(__FreeBSD__)
                           "/usr/local/lib/mozilla"
#else
                           "/usr/lib/mozilla"
#endif
                           );
  rv = NS_NewNativeLocalFile(dirname, false, getter_AddRefs(localDir));
#endif

  if (NS_SUCCEEDED(rv)) {
    localDir.forget(aFile);
  }
  return rv;
}
#endif

NS_IMETHODIMP
nsXREDirProvider::GetFile(const char* aProperty, bool* aPersistent,
                          nsIFile** aFile)
{
  nsresult rv;

  bool gettingProfile = false;

  if (!strcmp(aProperty, NS_APP_USER_PROFILE_LOCAL_50_DIR)) {
    // If XRE_NotifyProfile hasn't been called, don't fall through to
    // mAppProvider on the profile keys.
    if (!mProfileNotified)
      return NS_ERROR_FAILURE;

    if (mProfileLocalDir)
      return mProfileLocalDir->Clone(aFile);

    if (mAppProvider)
      return mAppProvider->GetFile(aProperty, aPersistent, aFile);

    // This falls through to the case below
    gettingProfile = true;
  }
  if (!strcmp(aProperty, NS_APP_USER_PROFILE_50_DIR) || gettingProfile) {
    if (!mProfileNotified)
      return NS_ERROR_FAILURE;

    if (mProfileDir)
      return mProfileDir->Clone(aFile);

    if (mAppProvider)
      return mAppProvider->GetFile(aProperty, aPersistent, aFile);

    // If we don't succeed here, bail early so that we aren't reentrant
    // through the "GetProfileDir" call below.
    return NS_ERROR_FAILURE;
  }

  if (mAppProvider) {
    rv = mAppProvider->GetFile(aProperty, aPersistent, aFile);
    if (NS_SUCCEEDED(rv) && *aFile)
      return rv;
  }

  *aPersistent = true;

  if (!strcmp(aProperty, NS_GRE_DIR)) {
    return mGREDir->Clone(aFile);
  }
  else if (!strcmp(aProperty, NS_GRE_BIN_DIR)) {
    return mGREBinDir->Clone(aFile);
  }
  else if (!strcmp(aProperty, NS_OS_CURRENT_PROCESS_DIR) ||
           !strcmp(aProperty, NS_APP_INSTALL_CLEANUP_DIR)) {
    return GetAppDir()->Clone(aFile);
  }

  rv = NS_ERROR_FAILURE;
  nsCOMPtr<nsIFile> file;

  if (!strcmp(aProperty, NS_APP_PREF_DEFAULTS_50_DIR))
  {
    // return the GRE default prefs directory here, and the app default prefs
    // directory (if applicable) in NS_APP_PREFS_DEFAULTS_DIR_LIST.
    rv = mGREDir->Clone(getter_AddRefs(file));
    if (NS_SUCCEEDED(rv)) {
      rv = file->AppendNative(NS_LITERAL_CSTRING("defaults"));
      if (NS_SUCCEEDED(rv))
        rv = file->AppendNative(NS_LITERAL_CSTRING("pref"));
    }
  }
  else if (!strcmp(aProperty, NS_APP_APPLICATION_REGISTRY_DIR) ||
           !strcmp(aProperty, XRE_USER_APP_DATA_DIR)) {
    rv = GetUserAppDataDirectory(getter_AddRefs(file));
  }
#if defined(XP_UNIX) || defined(XP_MACOSX)
  else if (!strcmp(aProperty, XRE_SYS_NATIVE_MESSAGING_MANIFESTS)) {
    nsCOMPtr<nsIFile> localDir;

    rv = ::GetSystemParentDirectory(getter_AddRefs(localDir));
    if (NS_SUCCEEDED(rv)) {
      NS_NAMED_LITERAL_CSTRING(dirname,
#if defined(XP_MACOSX)
                               "NativeMessagingHosts"
#else
                               "native-messaging-hosts"
#endif
                               );
      rv = localDir->AppendNative(dirname);
      if (NS_SUCCEEDED(rv)) {
        localDir.swap(file);
      }
    }
  }
  else if (!strcmp(aProperty, XRE_USER_NATIVE_MESSAGING_MANIFESTS)) {
    nsCOMPtr<nsIFile> localDir;
    rv = GetUserDataDirectoryHome(getter_AddRefs(localDir), false);
    if (NS_SUCCEEDED(rv)) {
#if defined(XP_MACOSX)
      rv = localDir->AppendNative(NS_LITERAL_CSTRING("Mozilla"));
      if (NS_SUCCEEDED(rv)) {
        rv = localDir->AppendNative(NS_LITERAL_CSTRING("NativeMessagingHosts"));
      }
#else
      rv = localDir->AppendNative(NS_LITERAL_CSTRING(".mozilla"));
      if (NS_SUCCEEDED(rv)) {
        rv = localDir->AppendNative(NS_LITERAL_CSTRING("native-messaging-hosts"));
      }
#endif
    }
    if (NS_SUCCEEDED(rv)) {
      localDir.swap(file);
    }
  }
#endif
  else if (!strcmp(aProperty, XRE_UPDATE_ROOT_DIR)) {
    rv = GetUpdateRootDir(getter_AddRefs(file));
  }
  else if (!strcmp(aProperty, NS_APP_APPLICATION_REGISTRY_FILE)) {
    rv = GetUserAppDataDirectory(getter_AddRefs(file));
    if (NS_SUCCEEDED(rv))
      rv = file->AppendNative(NS_LITERAL_CSTRING(APP_REGISTRY_NAME));
  }
  else if (!strcmp(aProperty, NS_APP_USER_PROFILES_ROOT_DIR)) {
    rv = GetUserProfilesRootDir(getter_AddRefs(file), nullptr, nullptr, nullptr);
  }
  else if (!strcmp(aProperty, NS_APP_USER_PROFILES_LOCAL_ROOT_DIR)) {
    rv = GetUserProfilesLocalDir(getter_AddRefs(file), nullptr, nullptr, nullptr);
  }
  else if (!strcmp(aProperty, XRE_EXECUTABLE_FILE) && gArgv[0]) {
    nsCOMPtr<nsIFile> lf;
    rv = XRE_GetBinaryPath(gArgv[0], getter_AddRefs(lf));
    if (NS_SUCCEEDED(rv))
      file = lf;
  }

  else if (!strcmp(aProperty, NS_APP_PROFILE_DIR_STARTUP) && mProfileDir) {
    return mProfileDir->Clone(aFile);
  }
  else if (!strcmp(aProperty, NS_APP_PROFILE_LOCAL_DIR_STARTUP)) {
    if (mProfileLocalDir)
      return mProfileLocalDir->Clone(aFile);

    if (mProfileDir)
      return mProfileDir->Clone(aFile);

    if (mAppProvider)
      return mAppProvider->GetFile(NS_APP_PROFILE_DIR_STARTUP, aPersistent,
                                   aFile);
  }
#if defined(XP_UNIX) || defined(XP_MACOSX)
  else if (!strcmp(aProperty, XRE_SYS_LOCAL_EXTENSION_PARENT_DIR)) {
#ifdef ENABLE_SYSTEM_EXTENSION_DIRS
    return GetSystemExtensionsDirectory(aFile);
#else
    return NS_ERROR_FAILURE;
#endif
  }
#endif
#if defined(XP_UNIX) && !defined(XP_MACOSX)
  else if (!strcmp(aProperty, XRE_SYS_SHARE_EXTENSION_PARENT_DIR)) {
#ifdef ENABLE_SYSTEM_EXTENSION_DIRS
#if defined(__OpenBSD__) || defined(__FreeBSD__)
    static const char *const sysLExtDir = "/usr/local/share/mozilla/extensions";
#else
    static const char *const sysLExtDir = "/usr/share/mozilla/extensions";
#endif
    return NS_NewNativeLocalFile(nsDependentCString(sysLExtDir),
                                 false, aFile);
#else
    return NS_ERROR_FAILURE;
#endif
  }
#endif
  else if (!strcmp(aProperty, XRE_USER_SYS_EXTENSION_DIR)) {
#ifdef ENABLE_SYSTEM_EXTENSION_DIRS
    return GetSysUserExtensionsDirectory(aFile);
#else
    return NS_ERROR_FAILURE;
#endif
  }
  else if (!strcmp(aProperty, XRE_APP_DISTRIBUTION_DIR)) {
    bool persistent = false;
    rv = GetFile(NS_GRE_DIR, &persistent, getter_AddRefs(file));
    if (NS_SUCCEEDED(rv))
      rv = file->AppendNative(NS_LITERAL_CSTRING("distribution"));
  }
  else if (!strcmp(aProperty, XRE_APP_FEATURES_DIR)) {
    rv = GetAppDir()->Clone(getter_AddRefs(file));
    if (NS_SUCCEEDED(rv))
      rv = file->AppendNative(NS_LITERAL_CSTRING("features"));
  }
  else if (!strcmp(aProperty, XRE_ADDON_APP_DIR)) {
    nsCOMPtr<nsIDirectoryServiceProvider> dirsvc(do_GetService("@mozilla.org/file/directory_service;1", &rv));
    if (NS_FAILED(rv))
      return rv;
    bool unused;
    rv = dirsvc->GetFile("XCurProcD", &unused, getter_AddRefs(file));
  }
  else if (NS_SUCCEEDED(GetProfileStartupDir(getter_AddRefs(file)))) {
    // We need to allow component, xpt, and chrome registration to
    // occur prior to the profile-after-change notification.
    if (!strcmp(aProperty, NS_APP_USER_CHROME_DIR)) {
      rv = file->AppendNative(NS_LITERAL_CSTRING("chrome"));
    }
  }

  if (NS_SUCCEEDED(rv) && file) {
    file.forget(aFile);
    return NS_OK;
  }

  bool ensureFilePermissions = false;

  if (NS_SUCCEEDED(GetProfileDir(getter_AddRefs(file)))) {
    if (!strcmp(aProperty, NS_APP_PREFS_50_DIR)) {
      rv = NS_OK;
    }
    else if (!strcmp(aProperty, NS_APP_PREFS_50_FILE)) {
      rv = file->AppendNative(NS_LITERAL_CSTRING("prefs.js"));
    }
    else if (!strcmp(aProperty, NS_LOCALSTORE_UNSAFE_FILE)) {
      rv = file->AppendNative(NS_LITERAL_CSTRING("localstore.rdf"));
    }
    else if (!strcmp(aProperty, NS_APP_LOCALSTORE_50_FILE)) {
      if (gSafeMode) {
        rv = file->AppendNative(NS_LITERAL_CSTRING("localstore-safe.rdf"));
        file->Remove(false);
      }
      else {
        rv = file->AppendNative(NS_LITERAL_CSTRING("localstore.rdf"));
        ensureFilePermissions = true;
      }
    }
    else if (!strcmp(aProperty, NS_APP_USER_MIMETYPES_50_FILE)) {
      rv = file->AppendNative(NS_LITERAL_CSTRING("mimeTypes.rdf"));
      ensureFilePermissions = true;
    }
    else if (!strcmp(aProperty, NS_APP_DOWNLOADS_50_FILE)) {
      rv = file->AppendNative(NS_LITERAL_CSTRING("downloads.rdf"));
    }
    else if (!strcmp(aProperty, NS_APP_PREFS_OVERRIDE_DIR)) {
      rv = mProfileDir->Clone(getter_AddRefs(file));
      nsresult tmp = file->AppendNative(NS_LITERAL_CSTRING(PREF_OVERRIDE_DIRNAME));
      if (NS_FAILED(tmp)) {
        rv = tmp;
      }
      tmp = EnsureDirectoryExists(file);
      if (NS_FAILED(tmp)) {
        rv = tmp;
      }
    }
  }
  if (NS_FAILED(rv) || !file)
    return NS_ERROR_FAILURE;

  if (ensureFilePermissions) {
    bool fileToEnsureExists;
    bool isWritable;
    if (NS_SUCCEEDED(file->Exists(&fileToEnsureExists)) && fileToEnsureExists
        && NS_SUCCEEDED(file->IsWritable(&isWritable)) && !isWritable) {
      uint32_t permissions;
      if (NS_SUCCEEDED(file->GetPermissions(&permissions))) {
        rv = file->SetPermissions(permissions | 0600);
        NS_ASSERTION(NS_SUCCEEDED(rv), "failed to ensure file permissions");
      }
    }
  }

  file.forget(aFile);
  return NS_OK;
}

static void
LoadDirIntoArray(nsIFile* dir,
                 const char *const *aAppendList,
                 nsCOMArray<nsIFile>& aDirectories)
{
  if (!dir)
    return;

  nsCOMPtr<nsIFile> subdir;
  dir->Clone(getter_AddRefs(subdir));
  if (!subdir)
    return;

  for (const char *const *a = aAppendList; *a; ++a) {
    subdir->AppendNative(nsDependentCString(*a));
  }

  bool exists;
  if (NS_SUCCEEDED(subdir->Exists(&exists)) && exists) {
    aDirectories.AppendObject(subdir);
  }
}

static void
LoadDirsIntoArray(nsCOMArray<nsIFile>& aSourceDirs,
                  const char *const* aAppendList,
                  nsCOMArray<nsIFile>& aDirectories)
{
  nsCOMPtr<nsIFile> appended;
  bool exists;

  for (int32_t i = 0; i < aSourceDirs.Count(); ++i) {
    aSourceDirs[i]->Clone(getter_AddRefs(appended));
    if (!appended)
      continue;

    nsAutoCString leaf;
    appended->GetNativeLeafName(leaf);
    if (!Substring(leaf, leaf.Length() - 4).EqualsLiteral(".xpi")) {
      LoadDirIntoArray(appended,
                       aAppendList,
                       aDirectories);
    }
    else if (NS_SUCCEEDED(appended->Exists(&exists)) && exists)
      aDirectories.AppendObject(appended);
  }
}

NS_IMETHODIMP
nsXREDirProvider::GetFiles(const char* aProperty, nsISimpleEnumerator** aResult)
{
  nsresult rv;

  nsCOMPtr<nsISimpleEnumerator> appEnum;
  nsCOMPtr<nsIDirectoryServiceProvider2>
    appP2(do_QueryInterface(mAppProvider));
  if (appP2) {
    rv = appP2->GetFiles(aProperty, getter_AddRefs(appEnum));
    if (NS_FAILED(rv)) {
      appEnum = nullptr;
    }
    else if (rv != NS_SUCCESS_AGGREGATE_RESULT) {
      appEnum.forget(aResult);
      return NS_OK;
    }
  }

  nsCOMPtr<nsISimpleEnumerator> xreEnum;
  rv = GetFilesInternal(aProperty, getter_AddRefs(xreEnum));
  if (NS_FAILED(rv)) {
    if (appEnum) {
      appEnum.forget(aResult);
      return NS_SUCCESS_AGGREGATE_RESULT;
    }

    return rv;
  }

  rv = NS_NewUnionEnumerator(aResult, appEnum, xreEnum);
  if (NS_FAILED(rv))
    return rv;

  return NS_SUCCESS_AGGREGATE_RESULT;
}

static void
RegisterExtensionInterpositions(nsINIParser &parser)
{
  if (!mozilla::Preferences::GetBool("extensions.interposition.enabled", false))
    return;

  nsCOMPtr<nsIAddonInterposition> interposition =
    do_GetService("@mozilla.org/addons/multiprocess-shims;1");

  nsresult rv;
  int32_t i = 0;
  do {
    nsAutoCString buf("Extension");
    buf.AppendInt(i++);

    nsAutoCString addonId;
    rv = parser.GetString("MultiprocessIncompatibleExtensions", buf.get(), addonId);
    if (NS_FAILED(rv))
      return;

    if (!xpc::SetAddonInterposition(addonId, interposition))
      continue;

    if (!xpc::AllowCPOWsInAddon(addonId, true))
      continue;
  }
  while (true);
}

static void
LoadExtensionDirectories(nsINIParser &parser,
                         const char *aSection,
                         nsCOMArray<nsIFile> &aDirectories,
                         NSLocationType aType)
{
  nsresult rv;
  int32_t i = 0;
  do {
    nsAutoCString buf("Extension");
    buf.AppendInt(i++);

    nsAutoCString path;
    rv = parser.GetString(aSection, buf.get(), path);
    if (NS_FAILED(rv))
      return;

    nsCOMPtr<nsIFile> dir = do_CreateInstance("@mozilla.org/file/local;1", &rv);
    if (NS_FAILED(rv))
      continue;

    rv = dir->SetPersistentDescriptor(path);
    if (NS_FAILED(rv))
      continue;

    aDirectories.AppendObject(dir);
    if (Substring(path, path.Length() - 4).EqualsLiteral(".xpi")) {
      XRE_AddJarManifestLocation(aType, dir);
    }
    else {
      nsCOMPtr<nsIFile> manifest =
        CloneAndAppend(dir, "chrome.manifest");
      XRE_AddManifestLocation(aType, manifest);
    }
  }
  while (true);
}

void
nsXREDirProvider::LoadExtensionBundleDirectories()
{
  if (!mozilla::Preferences::GetBool("extensions.defaultProviders.enabled", true))
    return;

  if (mProfileDir) {
    if (!gSafeMode) {
      nsCOMPtr<nsIFile> extensionsINI;
      mProfileDir->Clone(getter_AddRefs(extensionsINI));
      if (!extensionsINI)
        return;

      extensionsINI->AppendNative(NS_LITERAL_CSTRING("extensions.ini"));

      nsCOMPtr<nsIFile> extensionsINILF =
        do_QueryInterface(extensionsINI);
      if (!extensionsINILF)
        return;

      nsINIParser parser;
      nsresult rv = parser.Init(extensionsINILF);
      if (NS_FAILED(rv))
        return;

      RegisterExtensionInterpositions(parser);
      LoadExtensionDirectories(parser, "ExtensionDirs", mExtensionDirectories,
                               NS_EXTENSION_LOCATION);
      LoadExtensionDirectories(parser, "ThemeDirs", mThemeDirectories,
                               NS_SKIN_LOCATION);
/* non-Firefox applications that use overrides in their default theme should
 * define AC_DEFINE(MOZ_SEPARATE_MANIFEST_FOR_THEME_OVERRIDES) in their
 * configure.in */
#if defined(MOZ_BUILD_APP_IS_BROWSER) || defined(MOZ_SEPARATE_MANIFEST_FOR_THEME_OVERRIDES)
    } else {
      // In safe mode, still load the default theme directory:
      nsCOMPtr<nsIFile> themeManifest;
      mXULAppDir->Clone(getter_AddRefs(themeManifest));
      themeManifest->AppendNative(NS_LITERAL_CSTRING("extensions"));
      themeManifest->AppendNative(NS_LITERAL_CSTRING("{972ce4c6-7e08-4474-a285-3208198ce6fd}.xpi"));
      bool exists = false;
      if (NS_SUCCEEDED(themeManifest->Exists(&exists)) && exists) {
        XRE_AddJarManifestLocation(NS_SKIN_LOCATION, themeManifest);
      } else {
        themeManifest->SetNativeLeafName(NS_LITERAL_CSTRING("{972ce4c6-7e08-4474-a285-3208198ce6fd}"));
        themeManifest->AppendNative(NS_LITERAL_CSTRING("chrome.manifest"));
        XRE_AddManifestLocation(NS_SKIN_LOCATION, themeManifest);
      }
#endif
    }
  }
}

static const char *const kAppendPrefDir[] = { "defaults", "preferences", nullptr };

#ifdef DEBUG_bsmedberg
static void
DumpFileArray(const char *key,
              nsCOMArray<nsIFile> dirs)
{
  fprintf(stderr, "nsXREDirProvider::GetFilesInternal(%s)\n", key);

  nsAutoCString path;
  for (int32_t i = 0; i < dirs.Count(); ++i) {
    dirs[i]->GetNativePath(path);
    fprintf(stderr, "  %s\n", path.get());
  }
}
#endif // DEBUG_bsmedberg

nsresult
nsXREDirProvider::GetFilesInternal(const char* aProperty,
                                   nsISimpleEnumerator** aResult)
{
  nsresult rv = NS_OK;
  *aResult = nullptr;

  if (!strcmp(aProperty, XRE_EXTENSIONS_DIR_LIST)) {
    nsCOMArray<nsIFile> directories;

    static const char *const kAppendNothing[] = { nullptr };

    LoadDirsIntoArray(mAppBundleDirectories,
                      kAppendNothing, directories);
    LoadDirsIntoArray(mExtensionDirectories,
                      kAppendNothing, directories);

    rv = NS_NewArrayEnumerator(aResult, directories);
  }
  else if (!strcmp(aProperty, NS_APP_PREFS_DEFAULTS_DIR_LIST)) {
    nsCOMArray<nsIFile> directories;

    LoadDirIntoArray(mXULAppDir, kAppendPrefDir, directories);
    LoadDirsIntoArray(mAppBundleDirectories,
                      kAppendPrefDir, directories);

    rv = NS_NewArrayEnumerator(aResult, directories);
  }
  else if (!strcmp(aProperty, NS_EXT_PREFS_DEFAULTS_DIR_LIST)) {
    nsCOMArray<nsIFile> directories;

    LoadDirsIntoArray(mExtensionDirectories,
                      kAppendPrefDir, directories);

    if (mProfileDir) {
      nsCOMPtr<nsIFile> overrideFile;
      mProfileDir->Clone(getter_AddRefs(overrideFile));
      overrideFile->AppendNative(NS_LITERAL_CSTRING(PREF_OVERRIDE_DIRNAME));

      bool exists;
      if (NS_SUCCEEDED(overrideFile->Exists(&exists)) && exists)
        directories.AppendObject(overrideFile);
    }

    rv = NS_NewArrayEnumerator(aResult, directories);
  }
  else if (!strcmp(aProperty, NS_APP_CHROME_DIR_LIST)) {
    // NS_APP_CHROME_DIR_LIST is only used to get default (native) icons
    // for OS window decoration.

    static const char *const kAppendChromeDir[] = { "chrome", nullptr };
    nsCOMArray<nsIFile> directories;
    LoadDirIntoArray(mXULAppDir,
                     kAppendChromeDir,
                     directories);
    LoadDirsIntoArray(mAppBundleDirectories,
                      kAppendChromeDir,
                      directories);
    LoadDirsIntoArray(mExtensionDirectories,
                      kAppendChromeDir,
                      directories);

    rv = NS_NewArrayEnumerator(aResult, directories);
  }
  else if (!strcmp(aProperty, NS_APP_PLUGINS_DIR_LIST)) {
    nsCOMArray<nsIFile> directories;

    if (mozilla::Preferences::GetBool("plugins.load_appdir_plugins", false)) {
      nsCOMPtr<nsIFile> appdir;
      rv = XRE_GetBinaryPath(gArgv[0], getter_AddRefs(appdir));
      if (NS_SUCCEEDED(rv)) {
        appdir->SetNativeLeafName(NS_LITERAL_CSTRING("plugins"));
        directories.AppendObject(appdir);
      }
    }

    static const char *const kAppendPlugins[] = { "plugins", nullptr };

    // The root dirserviceprovider does quite a bit for us: we're mainly
    // interested in xulapp and extension-provided plugins.
    LoadDirsIntoArray(mAppBundleDirectories,
                      kAppendPlugins,
                      directories);
    LoadDirsIntoArray(mExtensionDirectories,
                      kAppendPlugins,
                      directories);

    if (mProfileDir) {
      nsCOMArray<nsIFile> profileDir;
      profileDir.AppendObject(mProfileDir);
      LoadDirsIntoArray(profileDir,
                        kAppendPlugins,
                        directories);
    }

    rv = NS_NewArrayEnumerator(aResult, directories);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = NS_SUCCESS_AGGREGATE_RESULT;
  }
  else
    rv = NS_ERROR_FAILURE;

  return rv;
}

NS_IMETHODIMP
nsXREDirProvider::GetDirectory(nsIFile* *aResult)
{
  NS_ENSURE_TRUE(mProfileDir, NS_ERROR_NOT_INITIALIZED);

  return mProfileDir->Clone(aResult);
}

NS_IMETHODIMP
nsXREDirProvider::DoStartup()
{
  if (!mProfileNotified) {
    nsCOMPtr<nsIObserverService> obsSvc =
      mozilla::services::GetObserverService();
    if (!obsSvc) return NS_ERROR_FAILURE;

    mProfileNotified = true;

    /*
       Setup prefs before profile-do-change to be able to use them to track
       crashes and because we want to begin crash tracking before other code run
       from this notification since they may cause crashes.
    */
    nsresult rv = mozilla::Preferences::ResetAndReadUserPrefs();
    if (NS_FAILED(rv)) NS_WARNING("Failed to setup pref service.");

    bool safeModeNecessary = false;
    nsCOMPtr<nsIAppStartup> appStartup (do_GetService(NS_APPSTARTUP_CONTRACTID));
    if (appStartup) {
      rv = appStartup->TrackStartupCrashBegin(&safeModeNecessary);
      if (NS_FAILED(rv) && rv != NS_ERROR_NOT_AVAILABLE)
        NS_WARNING("Error while beginning startup crash tracking");

      if (!gSafeMode && safeModeNecessary) {
        appStartup->RestartInSafeMode(nsIAppStartup::eForceQuit);
        return NS_OK;
      }
    }

    static const char16_t kStartup[] = {'s','t','a','r','t','u','p','\0'};
    obsSvc->NotifyObservers(nullptr, "profile-do-change", kStartup);

    // Init the Extension Manager
    nsCOMPtr<nsIObserver> em = do_GetService("@mozilla.org/addons/integration;1");
    if (em) {
      em->Observe(nullptr, "addons-startup", nullptr);
    } else {
      NS_WARNING("Failed to create Addons Manager.");
    }

    LoadExtensionBundleDirectories();

    obsSvc->NotifyObservers(nullptr, "load-extension-defaults", nullptr);
    obsSvc->NotifyObservers(nullptr, "profile-after-change", kStartup);

    // Any component that has registered for the profile-after-change category
    // should also be created at this time.
    (void)NS_CreateServicesFromCategory("profile-after-change", nullptr,
                                        "profile-after-change");

    if (gSafeMode && safeModeNecessary) {
      static const char16_t kCrashed[] = {'c','r','a','s','h','e','d','\0'};
      obsSvc->NotifyObservers(nullptr, "safemode-forced", kCrashed);
    }

    // 1 = Regular mode, 2 = Safe mode, 3 = Safe mode forced
    int mode = 1;
    if (gSafeMode) {
      if (safeModeNecessary)
        mode = 3;
      else
        mode = 2;
    }
    mozilla::Telemetry::Accumulate(mozilla::Telemetry::SAFE_MODE_USAGE, mode);

    // Telemetry about number of profiles.
    nsCOMPtr<nsIToolkitProfileService> profileService =
      do_GetService("@mozilla.org/toolkit/profile-service;1");
    if (profileService) {
      nsCOMPtr<nsISimpleEnumerator> profiles;
      rv = profileService->GetProfiles(getter_AddRefs(profiles));
      if (NS_WARN_IF(NS_FAILED(rv))) {
        return rv;
      }

      uint32_t count = 0;
      nsCOMPtr<nsISupports> profile;
      while (NS_SUCCEEDED(profiles->GetNext(getter_AddRefs(profile)))) {
        ++count;
      }

      mozilla::Telemetry::Accumulate(mozilla::Telemetry::NUMBER_OF_PROFILES,
                                     count);
    }

    obsSvc->NotifyObservers(nullptr, "profile-initial-state", nullptr);
  }
  return NS_OK;
}

void
nsXREDirProvider::DoShutdown()
{
  PROFILER_LABEL_FUNC(js::ProfileEntry::Category::OTHER);

  if (mProfileNotified) {
    nsCOMPtr<nsIObserverService> obsSvc =
      mozilla::services::GetObserverService();
    NS_ASSERTION(obsSvc, "No observer service?");
    if (obsSvc) {
      static const char16_t kShutdownPersist[] = u"shutdown-persist";
      obsSvc->NotifyObservers(nullptr, "profile-change-net-teardown", kShutdownPersist);
      obsSvc->NotifyObservers(nullptr, "profile-change-teardown", kShutdownPersist);

      // Phase 2c: Now that things are torn down, force JS GC so that things which depend on
      // resources which are about to go away in "profile-before-change" are destroyed first.

      if (JSContext* cx = dom::danger::GetJSContext()) {
        JS_GC(cx);
      }

      // Phase 3: Notify observers of a profile change
      obsSvc->NotifyObservers(nullptr, "profile-before-change", kShutdownPersist);
      obsSvc->NotifyObservers(nullptr, "profile-before-change-qm", kShutdownPersist);
      obsSvc->NotifyObservers(nullptr, "profile-before-change-telemetry", kShutdownPersist);
    }
    mProfileNotified = false;
  }
}

#ifdef XP_WIN
static nsresult
GetShellFolderPath(int folder, nsAString& _retval)
{
  wchar_t* buf;
  uint32_t bufLength = _retval.GetMutableData(&buf, MAXPATHLEN + 3);
  NS_ENSURE_TRUE(bufLength >= (MAXPATHLEN + 3), NS_ERROR_OUT_OF_MEMORY);

  nsresult rv = NS_OK;

  LPITEMIDLIST pItemIDList = nullptr;

  if (SUCCEEDED(SHGetSpecialFolderLocation(nullptr, folder, &pItemIDList)) &&
      SHGetPathFromIDListW(pItemIDList, buf)) {
    // We're going to use wcslen (wcsnlen not available in msvc7.1) so make
    // sure to null terminate.
    buf[bufLength - 1] = L'\0';
    _retval.SetLength(wcslen(buf));
  } else {
    _retval.SetLength(0);
    rv = NS_ERROR_NOT_AVAILABLE;
  }

  CoTaskMemFree(pItemIDList);

  return rv;
}

/**
 * Provides a fallback for getting the path to APPDATA or LOCALAPPDATA by
 * querying the registry when the call to SHGetSpecialFolderLocation or
 * SHGetPathFromIDListW is unable to provide these paths (Bug 513958).
 */
static nsresult
GetRegWindowsAppDataFolder(bool aLocal, nsAString& _retval)
{
  HKEY key;
  NS_NAMED_LITERAL_STRING(keyName,
  "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Shell Folders");
  DWORD res = ::RegOpenKeyExW(HKEY_CURRENT_USER, keyName.get(), 0, KEY_READ,
                              &key);
  if (res != ERROR_SUCCESS) {
    _retval.SetLength(0);
    return NS_ERROR_NOT_AVAILABLE;
  }

  DWORD type, size;
  res = RegQueryValueExW(key, (aLocal ? L"Local AppData" : L"AppData"),
                         nullptr, &type, nullptr, &size);
  // The call to RegQueryValueExW must succeed, the type must be REG_SZ, the
  // buffer size must not equal 0, and the buffer size be a multiple of 2.
  if (res != ERROR_SUCCESS || type != REG_SZ || size == 0 || size % 2 != 0) {
    ::RegCloseKey(key);
    _retval.SetLength(0);
    return NS_ERROR_NOT_AVAILABLE;
  }

  // |size| may or may not include room for the terminating null character
  DWORD resultLen = size / 2;

  if (!_retval.SetLength(resultLen, mozilla::fallible)) {
    ::RegCloseKey(key);
    _retval.SetLength(0);
    return NS_ERROR_NOT_AVAILABLE;
  }

  nsAString::iterator begin;
  _retval.BeginWriting(begin);

  res = RegQueryValueExW(key, (aLocal ? L"Local AppData" : L"AppData"),
                         nullptr, nullptr, (LPBYTE) begin.get(), &size);
  ::RegCloseKey(key);
  if (res != ERROR_SUCCESS) {
    _retval.SetLength(0);
    return NS_ERROR_NOT_AVAILABLE;
  }

  if (!_retval.CharAt(resultLen - 1)) {
    // It was already null terminated.
    _retval.Truncate(resultLen - 1);
  }

  return NS_OK;
}

static bool
GetCachedHash(HKEY rootKey, const nsAString &regPath, const nsAString &path,
              nsAString &cachedHash)
{
  HKEY baseKey;
  if (RegOpenKeyExW(rootKey, reinterpret_cast<const wchar_t*>(regPath.BeginReading()), 0, KEY_READ, &baseKey) !=
      ERROR_SUCCESS) {
    return false;
  }

  wchar_t cachedHashRaw[512];
  DWORD bufferSize = sizeof(cachedHashRaw);
  LONG result = RegQueryValueExW(baseKey, reinterpret_cast<const wchar_t*>(path.BeginReading()), 0, nullptr,
                                 (LPBYTE)cachedHashRaw, &bufferSize);
  RegCloseKey(baseKey);
  if (result == ERROR_SUCCESS) {
    cachedHash.Assign(cachedHashRaw);
  }
  return ERROR_SUCCESS == result;
}

#endif

nsresult
nsXREDirProvider::GetUpdateRootDir(nsIFile* *aResult)
{
  nsCOMPtr<nsIFile> updRoot;
#if defined(MOZ_WIDGET_GONK)

  nsresult rv = NS_NewNativeLocalFile(nsDependentCString("/data/local"),
                                      true,
                                      getter_AddRefs(updRoot));
  NS_ENSURE_SUCCESS(rv, rv);

#else
  nsCOMPtr<nsIFile> appFile;
  bool per = false;
  nsresult rv = GetFile(XRE_EXECUTABLE_FILE, &per, getter_AddRefs(appFile));
  NS_ENSURE_SUCCESS(rv, rv);
  rv = appFile->GetParent(getter_AddRefs(updRoot));
  NS_ENSURE_SUCCESS(rv, rv);

#ifdef XP_MACOSX
  nsCOMPtr<nsIFile> appRootDirFile;
  nsCOMPtr<nsIFile> localDir;
  nsAutoString appDirPath;
  if (NS_FAILED(appFile->GetParent(getter_AddRefs(appRootDirFile))) ||
      NS_FAILED(appRootDirFile->GetPath(appDirPath)) ||
      NS_FAILED(GetUserDataDirectoryHome(getter_AddRefs(localDir), true))) {
    return NS_ERROR_FAILURE;
  }

  int32_t dotIndex = appDirPath.RFind(".app");
  if (dotIndex == kNotFound) {
    dotIndex = appDirPath.Length();
  }
  appDirPath = Substring(appDirPath, 1, dotIndex - 1);

  bool hasVendor = gAppData->vendor && strlen(gAppData->vendor) != 0;
  if (hasVendor || gAppData->name) {
    if (NS_FAILED(localDir->AppendNative(nsDependentCString(hasVendor ?
                                           gAppData->vendor :
                                           gAppData->name)))) {
      return NS_ERROR_FAILURE;
    }
  } else if (NS_FAILED(localDir->AppendNative(NS_LITERAL_CSTRING("Mozilla")))) {
    return NS_ERROR_FAILURE;
  }

  if (NS_FAILED(localDir->Append(NS_LITERAL_STRING("updates"))) ||
      NS_FAILED(localDir->AppendRelativePath(appDirPath))) {
    return NS_ERROR_FAILURE;
  }

  localDir.forget(aResult);
  return NS_OK;

#elif XP_WIN
  nsAutoString pathHash;
  bool pathHashResult = false;
  bool hasVendor = gAppData->vendor && strlen(gAppData->vendor) != 0;

  nsAutoString appDirPath;
  if (SUCCEEDED(updRoot->GetPath(appDirPath))) {

    // Figure out where we should check for a cached hash value. If the
    // application doesn't have the nsXREAppData vendor value defined check
    // under SOFTWARE\Mozilla.
    wchar_t regPath[1024] = { L'\0' };
    swprintf_s(regPath, mozilla::ArrayLength(regPath), L"SOFTWARE\\%S\\%S\\TaskBarIDs",
               (hasVendor ? gAppData->vendor : "Mozilla"), MOZ_APP_BASENAME);

    // If we pre-computed the hash, grab it from the registry.
    pathHashResult = GetCachedHash(HKEY_LOCAL_MACHINE,
                                   nsDependentString(regPath), appDirPath,
                                   pathHash);
    if (!pathHashResult) {
      pathHashResult = GetCachedHash(HKEY_CURRENT_USER,
                                     nsDependentString(regPath), appDirPath,
                                     pathHash);
    }
  }

  // Get the local app data directory and if a vendor name exists append it.
  // If only a product name exists, append it.  If neither exist fallback to
  // old handling.  We don't use the product name on purpose because we want a
  // shared update directory for different apps run from the same path.
  nsCOMPtr<nsIFile> localDir;
  if (pathHashResult && (hasVendor || gAppData->name) &&
      NS_SUCCEEDED(GetUserDataDirectoryHome(getter_AddRefs(localDir), true)) &&
      NS_SUCCEEDED(localDir->AppendNative(nsDependentCString(hasVendor ?
                                          gAppData->vendor : gAppData->name))) &&
      NS_SUCCEEDED(localDir->Append(NS_LITERAL_STRING("updates"))) &&
      NS_SUCCEEDED(localDir->Append(pathHash))) {
    localDir.forget(aResult);
    return NS_OK;
  }

  nsAutoString appPath;
  rv = updRoot->GetPath(appPath);
  NS_ENSURE_SUCCESS(rv, rv);

  // AppDir may be a short path. Convert to long path to make sure
  // the consistency of the update folder location
  nsString longPath;
  wchar_t* buf;

  uint32_t bufLength = longPath.GetMutableData(&buf, MAXPATHLEN);
  NS_ENSURE_TRUE(bufLength >= MAXPATHLEN, NS_ERROR_OUT_OF_MEMORY);

  DWORD len = GetLongPathNameW(appPath.get(), buf, bufLength);

  // Failing GetLongPathName() is not fatal.
  if (len <= 0 || len >= bufLength)
    longPath.Assign(appPath);
  else
    longPath.SetLength(len);

  // Use <UserLocalDataDir>\updates\<relative path to app dir from
  // Program Files> if app dir is under Program Files to avoid the
  // folder virtualization mess on Windows Vista
  nsAutoString programFiles;
  rv = GetShellFolderPath(CSIDL_PROGRAM_FILES, programFiles);
  NS_ENSURE_SUCCESS(rv, rv);

  programFiles.Append('\\');
  uint32_t programFilesLen = programFiles.Length();

  nsAutoString programName;
  if (_wcsnicmp(programFiles.get(), longPath.get(), programFilesLen) == 0) {
    programName = Substring(longPath, programFilesLen);
  } else {
    // We need the update root directory to live outside of the installation
    // directory, because otherwise the updater writing the log file can cause
    // the directory to be locked, which prevents it from being replaced after
    // background updates.
    programName.AssignASCII(MOZ_APP_NAME);
  }

  rv = GetUserLocalDataDirectory(getter_AddRefs(updRoot));
  NS_ENSURE_SUCCESS(rv, rv);

  rv = updRoot->AppendRelativePath(programName);
  NS_ENSURE_SUCCESS(rv, rv);

#endif // XP_WIN
#endif
  updRoot.forget(aResult);
  return NS_OK;
}

nsresult
nsXREDirProvider::GetProfileStartupDir(nsIFile* *aResult)
{
  if (mProfileDir)
    return mProfileDir->Clone(aResult);

  if (mAppProvider) {
    nsCOMPtr<nsIFile> needsclone;
    bool dummy;
    nsresult rv = mAppProvider->GetFile(NS_APP_PROFILE_DIR_STARTUP,
                                        &dummy,
                                        getter_AddRefs(needsclone));
    if (NS_SUCCEEDED(rv))
      return needsclone->Clone(aResult);
  }

  return NS_ERROR_FAILURE;
}

nsresult
nsXREDirProvider::GetProfileDir(nsIFile* *aResult)
{
  if (mProfileDir) {
    if (!mProfileNotified)
      return NS_ERROR_FAILURE;

    return mProfileDir->Clone(aResult);
  }

  if (mAppProvider) {
    nsCOMPtr<nsIFile> needsclone;
    bool dummy;
    nsresult rv = mAppProvider->GetFile(NS_APP_USER_PROFILE_50_DIR,
                                        &dummy,
                                        getter_AddRefs(needsclone));
    if (NS_SUCCEEDED(rv))
      return needsclone->Clone(aResult);
  }

  return NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR, aResult);
}

nsresult
nsXREDirProvider::GetUserDataDirectoryHome(nsIFile** aFile, bool aLocal)
{
  // Copied from nsAppFileLocationProvider (more or less)
  nsresult rv;
  nsCOMPtr<nsIFile> localDir;

#if defined(XP_MACOSX)
  FSRef fsRef;
  OSType folderType;
  if (aLocal) {
    folderType = kCachedDataFolderType;
  } else {
#ifdef MOZ_THUNDERBIRD
    folderType = kDomainLibraryFolderType;
#else
    folderType = kApplicationSupportFolderType;
#endif
  }
  OSErr err = ::FSFindFolder(kUserDomain, folderType, kCreateFolder, &fsRef);
  NS_ENSURE_FALSE(err, NS_ERROR_FAILURE);

  rv = NS_NewNativeLocalFile(EmptyCString(), true, getter_AddRefs(localDir));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsILocalFileMac> dirFileMac = do_QueryInterface(localDir);
  NS_ENSURE_TRUE(dirFileMac, NS_ERROR_UNEXPECTED);

  rv = dirFileMac->InitWithFSRef(&fsRef);
  NS_ENSURE_SUCCESS(rv, rv);

  localDir = do_QueryInterface(dirFileMac, &rv);
#elif defined(XP_IOS)
  nsAutoCString userDir;
  if (GetUIKitDirectory(aLocal, userDir)) {
    rv = NS_NewNativeLocalFile(userDir, true, getter_AddRefs(localDir));
  } else {
    rv = NS_ERROR_FAILURE;
  }
  NS_ENSURE_SUCCESS(rv, rv);
#elif defined(XP_WIN)
  nsString path;
  if (aLocal) {
    rv = GetShellFolderPath(CSIDL_LOCAL_APPDATA, path);
    if (NS_FAILED(rv))
      rv = GetRegWindowsAppDataFolder(aLocal, path);
  }
  if (!aLocal || NS_FAILED(rv)) {
    rv = GetShellFolderPath(CSIDL_APPDATA, path);
    if (NS_FAILED(rv)) {
      if (!aLocal)
        rv = GetRegWindowsAppDataFolder(aLocal, path);
    }
  }
  NS_ENSURE_SUCCESS(rv, rv);

  rv = NS_NewLocalFile(path, true, getter_AddRefs(localDir));
#elif defined(MOZ_WIDGET_GONK)
  rv = NS_NewNativeLocalFile(NS_LITERAL_CSTRING("/data/b2g"), true,
                             getter_AddRefs(localDir));
#elif defined(XP_UNIX)
  const char* homeDir = getenv("HOME");
  if (!homeDir || !*homeDir)
    return NS_ERROR_FAILURE;

#ifdef ANDROID /* We want (ProfD == ProfLD) on Android. */
  aLocal = false;
#endif

  if (aLocal) {
    // If $XDG_CACHE_HOME is defined use it, otherwise use $HOME/.cache.
    const char* cacheHome = getenv("XDG_CACHE_HOME");
    if (cacheHome && *cacheHome) {
      rv = NS_NewNativeLocalFile(nsDependentCString(cacheHome), true,
                                 getter_AddRefs(localDir));
    } else {
      rv = NS_NewNativeLocalFile(nsDependentCString(homeDir), true,
                                 getter_AddRefs(localDir));
      if (NS_SUCCEEDED(rv))
        rv = localDir->AppendNative(NS_LITERAL_CSTRING(".cache"));
    }
  } else {
    rv = NS_NewNativeLocalFile(nsDependentCString(homeDir), true,
                               getter_AddRefs(localDir));
  }
#else
#error "Don't know how to get product dir on your platform"
#endif

  NS_IF_ADDREF(*aFile = localDir);
  return rv;
}

nsresult
nsXREDirProvider::GetSysUserExtensionsDirectory(nsIFile** aFile)
{
  nsCOMPtr<nsIFile> localDir;
  nsresult rv = GetUserDataDirectoryHome(getter_AddRefs(localDir), false);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = AppendSysUserExtensionPath(localDir);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = EnsureDirectoryExists(localDir);
  NS_ENSURE_SUCCESS(rv, rv);

  localDir.forget(aFile);
  return NS_OK;
}

#if defined(XP_UNIX) || defined(XP_MACOSX)
nsresult
nsXREDirProvider::GetSystemExtensionsDirectory(nsIFile** aFile)
{
  nsresult rv;
  nsCOMPtr<nsIFile> localDir;

  rv = GetSystemParentDirectory(getter_AddRefs(localDir));
  if (NS_SUCCEEDED(rv)) {
    NS_NAMED_LITERAL_CSTRING(sExtensions,
#if defined(XP_MACOSX)
                             "Extensions"
#else
                             "extensions"
#endif
                             );

    rv = localDir->AppendNative(sExtensions);
    if (NS_SUCCEEDED(rv)) {
      localDir.forget(aFile);
    }
  }
  return rv;
}
#endif

nsresult
nsXREDirProvider::GetUserDataDirectory(nsIFile** aFile, bool aLocal,
                                       const nsACString* aProfileName,
                                       const nsACString* aAppName,
                                       const nsACString* aVendorName)
{
  nsCOMPtr<nsIFile> localDir;
  nsresult rv = GetUserDataDirectoryHome(getter_AddRefs(localDir), aLocal);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = AppendProfilePath(localDir, aProfileName, aAppName, aVendorName, aLocal);
  NS_ENSURE_SUCCESS(rv, rv);

#ifdef DEBUG_jungshik
  nsAutoCString cwd;
  localDir->GetNativePath(cwd);
  printf("nsXREDirProvider::GetUserDataDirectory: %s\n", cwd.get());
#endif
  rv = EnsureDirectoryExists(localDir);
  NS_ENSURE_SUCCESS(rv, rv);

  localDir.forget(aFile);
  return NS_OK;
}

nsresult
nsXREDirProvider::EnsureDirectoryExists(nsIFile* aDirectory)
{
  bool exists;
  nsresult rv = aDirectory->Exists(&exists);
  NS_ENSURE_SUCCESS(rv, rv);
#ifdef DEBUG_jungshik
  if (!exists) {
    nsAutoCString cwd;
    aDirectory->GetNativePath(cwd);
    printf("nsXREDirProvider::EnsureDirectoryExists: %s does not\n", cwd.get());
  }
#endif
  if (!exists)
    rv = aDirectory->Create(nsIFile::DIRECTORY_TYPE, 0700);
#ifdef DEBUG_jungshik
  if (NS_FAILED(rv))
    NS_WARNING("nsXREDirProvider::EnsureDirectoryExists: create failed");
#endif

  return rv;
}

nsresult
nsXREDirProvider::AppendSysUserExtensionPath(nsIFile* aFile)
{
  NS_ASSERTION(aFile, "Null pointer!");

  nsresult rv;

#if defined (XP_MACOSX) || defined(XP_WIN)

  static const char* const sXR = "Mozilla";
  rv = aFile->AppendNative(nsDependentCString(sXR));
  NS_ENSURE_SUCCESS(rv, rv);

  static const char* const sExtensions = "Extensions";
  rv = aFile->AppendNative(nsDependentCString(sExtensions));
  NS_ENSURE_SUCCESS(rv, rv);

#elif defined(XP_UNIX)

  static const char* const sXR = ".mozilla";
  rv = aFile->AppendNative(nsDependentCString(sXR));
  NS_ENSURE_SUCCESS(rv, rv);

  static const char* const sExtensions = "extensions";
  rv = aFile->AppendNative(nsDependentCString(sExtensions));
  NS_ENSURE_SUCCESS(rv, rv);

#else
#error "Don't know how to get XRE user extension path on your platform"
#endif
  return NS_OK;
}


nsresult
nsXREDirProvider::AppendProfilePath(nsIFile* aFile,
                                    const nsACString* aProfileName,
                                    const nsACString* aAppName,
                                    const nsACString* aVendorName,
                                    bool aLocal)
{
  NS_ASSERTION(aFile, "Null pointer!");
  
  if (!gAppData) {
    return NS_ERROR_FAILURE;
  }

  nsAutoCString profile;
  nsAutoCString appName;
  nsAutoCString vendor;
  if (aProfileName && !aProfileName->IsEmpty()) {
    profile = *aProfileName;
  } else if (aAppName) {
    appName = *aAppName;
    if (aVendorName) {
      vendor = *aVendorName;
    }
  } else if (gAppData->profile) {
    profile = gAppData->profile;
  } else {
    appName = gAppData->name;
    vendor = gAppData->vendor;
  }

  nsresult rv;

#if defined (XP_MACOSX)
  if (!profile.IsEmpty()) {
    rv = AppendProfileString(aFile, profile.get());
  }
  else {
    // Note that MacOS ignores the vendor when creating the profile hierarchy -
    // all application preferences directories live alongside one another in
    // ~/Library/Application Support/
    rv = aFile->AppendNative(appName);
  }
  NS_ENSURE_SUCCESS(rv, rv);

#elif defined(XP_WIN)
  if (!profile.IsEmpty()) {
    rv = AppendProfileString(aFile, profile.get());
  }
  else {
    if (!vendor.IsEmpty()) {
      rv = aFile->AppendNative(vendor);
      NS_ENSURE_SUCCESS(rv, rv);
    }
    rv = aFile->AppendNative(appName);
  }
  NS_ENSURE_SUCCESS(rv, rv);

#elif defined(ANDROID)
  // The directory used for storing profiles
  // The parent of this directory is set in GetUserDataDirectoryHome
  // XXX: handle gAppData->profile properly
  // XXXsmaug ...and the rest of the profile creation!
  MOZ_ASSERT(!aAppName,
             "Profile creation for external applications is not implemented!");
  rv = aFile->AppendNative(nsDependentCString("mozilla"));
  NS_ENSURE_SUCCESS(rv, rv);
#elif defined(XP_UNIX)
  nsAutoCString folder;
  // Make it hidden (by starting with "."), except when local (the
  // profile is already under ~/.cache or XDG_CACHE_HOME).
  if (!aLocal)
    folder.Assign('.');

  if (!profile.IsEmpty()) {
    // Skip any leading path characters
    const char* profileStart = profile.get();
    while (*profileStart == '/' || *profileStart == '\\')
      profileStart++;

    // On the off chance that someone wanted their folder to be hidden don't
    // let it become ".."
    if (*profileStart == '.' && !aLocal)
      profileStart++;

    folder.Append(profileStart);
    ToLowerCase(folder);

    rv = AppendProfileString(aFile, folder.BeginReading());
  }
  else {
    if (!vendor.IsEmpty()) {
      folder.Append(vendor);
      ToLowerCase(folder);

      rv = aFile->AppendNative(folder);
      NS_ENSURE_SUCCESS(rv, rv);

      folder.Truncate();
    }

    folder.Append(appName);
    ToLowerCase(folder);

    rv = aFile->AppendNative(folder);
  }
  NS_ENSURE_SUCCESS(rv, rv);

#else
#error "Don't know how to get profile path on your platform"
#endif
  return NS_OK;
}

nsresult
nsXREDirProvider::AppendProfileString(nsIFile* aFile, const char* aPath)
{
  NS_ASSERTION(aFile, "Null file!");
  NS_ASSERTION(aPath, "Null path!");

  nsAutoCString pathDup(aPath);

  char* path = pathDup.BeginWriting();

  nsresult rv;
  char* subdir;
  while ((subdir = NS_strtok("/\\", &path))) {
    rv = aFile->AppendNative(nsDependentCString(subdir));
    NS_ENSURE_SUCCESS(rv, rv);
  }

  return NS_OK;
}