summaryrefslogtreecommitdiffstats
path: root/mailnews/base/src/nsMsgFolderCompactor.cpp
blob: 4b0dc3ad5c36c3d25dfaa5d810a8c15d3e36a4e6 (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
/* -*- 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 "msgCore.h"    // precompiled header...
#include "nsCOMPtr.h"
#include "nsIMsgFolder.h"
#include "nsAutoPtr.h"
#include "nsIFile.h"
#include "nsNetUtil.h"
#include "nsIMsgHdr.h"
#include "nsIStreamListener.h"
#include "nsIMsgMessageService.h"
#include "nsMsgDBCID.h"
#include "nsMsgUtils.h"
#include "nsISeekableStream.h"
#include "nsIDBFolderInfo.h"
#include "nsIDocShell.h"
#include "nsIPrompt.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIMsgLocalMailFolder.h"
#include "nsIMsgImapMailFolder.h"
#include "nsMailHeaders.h"
#include "nsMsgI18N.h"
#include "prprf.h"
#include "nsMsgLocalFolderHdrs.h"
#include "nsIMsgDatabase.h"
#include "nsArrayUtils.h"
#include "nsMsgMessageFlags.h"
#include "nsIMsgStatusFeedback.h"
#include "nsMsgBaseCID.h"
#include "nsIMsgFolderNotificationService.h"
#include "nsIMsgPluggableStore.h"
#include "nsMsgFolderCompactor.h"
#include <algorithm>
#include "nsIOutputStream.h"
#include "nsIInputStream.h"
#include "nsPrintfCString.h"


//////////////////////////////////////////////////////////////////////////////
// nsFolderCompactState
//////////////////////////////////////////////////////////////////////////////

NS_IMPL_ISUPPORTS(nsFolderCompactState, nsIMsgFolderCompactor, nsIRequestObserver, nsIStreamListener, nsICopyMessageStreamListener, nsIUrlListener)

nsFolderCompactState::nsFolderCompactState()
{
  m_fileStream = nullptr;
  m_size = 0;
  m_curIndex = 0;
  m_status = NS_OK;
  m_compactAll = false;
  m_compactOfflineAlso = false;
  m_compactingOfflineFolders = false;
  m_parsingFolder=false;
  m_folderIndex = 0;
  m_startOfMsg = true;
  m_needStatusLine = false;
  m_totalExpungedBytes = 0;
  m_alreadyWarnedDiskSpace = false;
}

nsFolderCompactState::~nsFolderCompactState()
{
  CloseOutputStream();
  if (NS_FAILED(m_status))
  {
    CleanupTempFilesAfterError();
    // if for some reason we failed remove the temp folder and database
  }
}

void nsFolderCompactState::CloseOutputStream()
{
  if (m_fileStream)
  {
    m_fileStream->Close();
    m_fileStream = nullptr;
  }

}

void nsFolderCompactState::CleanupTempFilesAfterError()
{
  CloseOutputStream();
  if (m_db)
    m_db->ForceClosed();
  nsCOMPtr <nsIFile> summaryFile;
  GetSummaryFileLocation(m_file, getter_AddRefs(summaryFile)); 
  m_file->Remove(false);
  summaryFile->Remove(false);
}

nsresult nsFolderCompactState::BuildMessageURI(const char *baseURI, nsMsgKey key, nsCString& uri)
{
  uri.Append(baseURI);
  uri.Append('#');
  uri.AppendInt(key);

  return NS_OK;
}


nsresult
nsFolderCompactState::InitDB(nsIMsgDatabase *db)
{
  nsCOMPtr<nsIMsgDatabase> mailDBFactory;
  nsresult rv = db->ListAllKeys(m_keyArray);
  NS_ENSURE_SUCCESS(rv, rv);
  m_size = m_keyArray->m_keys.Length();

  nsCOMPtr<nsIMsgDBService> msgDBService = do_GetService(NS_MSGDB_SERVICE_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = msgDBService->OpenMailDBFromFile(m_file, m_folder, true, false,
                                     getter_AddRefs(m_db));

  if (rv == NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE ||
      rv == NS_MSG_ERROR_FOLDER_SUMMARY_MISSING)
      // if it's out of date then reopen with upgrade.
    return msgDBService->OpenMailDBFromFile(m_file,
                                            m_folder, true, true,
                               getter_AddRefs(m_db));
  return rv;
}

NS_IMETHODIMP nsFolderCompactState::CompactFolders(nsIArray *aArrayOfFoldersToCompact,
                                                   nsIArray *aOfflineFolderArray,
                                                   nsIUrlListener *aUrlListener,
                                                   nsIMsgWindow *aMsgWindow)
{
  m_window = aMsgWindow;
  m_listener = aUrlListener;
  if (aArrayOfFoldersToCompact)
    m_folderArray = aArrayOfFoldersToCompact;
  else if (aOfflineFolderArray)
  {
    m_folderArray = aOfflineFolderArray;
    m_compactingOfflineFolders = true;
    aOfflineFolderArray = nullptr;
  }
  if (!m_folderArray)
    return NS_OK;
 
  m_compactAll = true;
  m_compactOfflineAlso = aOfflineFolderArray != nullptr;
  if (m_compactOfflineAlso)
    m_offlineFolderArray = aOfflineFolderArray;

  m_folderIndex = 0;
  nsresult rv = NS_OK;
  nsCOMPtr<nsIMsgFolder> firstFolder = do_QueryElementAt(m_folderArray,
                                                         m_folderIndex, &rv);

  if (NS_SUCCEEDED(rv) && firstFolder)
    Compact(firstFolder, m_compactingOfflineFolders, aUrlListener, 
            aMsgWindow);   //start with first folder from here.
  
  return rv;
}

NS_IMETHODIMP
nsFolderCompactState::Compact(nsIMsgFolder *folder, bool aOfflineStore,
                              nsIUrlListener *aListener, nsIMsgWindow *aMsgWindow)
{
  NS_ENSURE_ARG_POINTER(folder);
  m_listener = aListener;
  if (!m_compactingOfflineFolders && !aOfflineStore)
  {
    nsCOMPtr <nsIMsgImapMailFolder> imapFolder = do_QueryInterface(folder);
    if (imapFolder)
      return imapFolder->Expunge(this, aMsgWindow);
  }

   m_window = aMsgWindow;
   nsresult rv;
   nsCOMPtr<nsIMsgDatabase> db;
   nsCOMPtr<nsIFile> path;
   nsCString baseMessageURI;

   nsCOMPtr <nsIMsgLocalMailFolder> localFolder = do_QueryInterface(folder, &rv);
   if (NS_SUCCEEDED(rv) && localFolder)
   {
     rv=localFolder->GetDatabaseWOReparse(getter_AddRefs(db));
     if (NS_FAILED(rv) || !db)
     {
       if (rv == NS_MSG_ERROR_FOLDER_SUMMARY_MISSING ||
           rv == NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE)
       {
         m_folder = folder;  //will be used to compact
         m_parsingFolder = true;
         rv = localFolder->ParseFolder(m_window, this);
       }
       return rv;
     }
     else
     {
       bool valid;
       rv = db->GetSummaryValid(&valid);
       if (!valid) //we are probably parsing the folder because we selected it.
       {
         folder->NotifyCompactCompleted();
         if (m_compactAll)
           return CompactNextFolder();
         else
           return NS_OK;
       }
     }
   }
   else
   {
     rv = folder->GetMsgDatabase(getter_AddRefs(db));
     NS_ENSURE_SUCCESS(rv, rv);
   }

  rv = folder->GetFilePath(getter_AddRefs(path));
  NS_ENSURE_SUCCESS(rv, rv);

  do {
    bool exists = false;
    rv = path->Exists(&exists);
    if (!exists) {
      // No need to compact if the local file does not exist.
      // Can happen e.g. on IMAP when the folder is not marked for offline use.
      break;
    }

    int64_t expunged = 0;
    folder->GetExpungedBytes(&expunged);
    if (expunged == 0) {
      // No need to compact if nothing would be expunged.
      break;
    }

    int64_t diskSize;
    rv = folder->GetSizeOnDisk(&diskSize);
    NS_ENSURE_SUCCESS(rv, rv);

    int64_t diskFree;
    rv = path->GetDiskSpaceAvailable(&diskFree);
    if (NS_FAILED(rv)) {
      // If GetDiskSpaceAvailable() failed, better bail out fast.
      if (rv != NS_ERROR_NOT_IMPLEMENTED)
        return rv;
      // Some platforms do not have GetDiskSpaceAvailable implemented.
      // In that case skip the preventive free space analysis and let it
      // fail in compact later if space actually wasn't available.
    } else {
      // Let's try to not even start compact if there is really low free space.
      // It may still fail later as we do not know how big exactly the folder DB will
      // end up being.
      // The DB already doesn't contain references to messages that are already deleted.
      // So theoretically it shouldn't shrink with compact. But in practice,
      // the automatic shrinking of the DB may still have not yet happened.
      // So we cap the final size at 1KB per message.
      db->Commit(nsMsgDBCommitType::kCompressCommit);

      int64_t dbSize;
      rv = db->GetDatabaseSize(&dbSize);
      NS_ENSURE_SUCCESS(rv, rv);

      int32_t totalMsgs;
      rv = folder->GetTotalMessages(false, &totalMsgs);
      NS_ENSURE_SUCCESS(rv, rv);
      int64_t expectedDBSize = std::min<int64_t>(dbSize, ((int64_t)totalMsgs) * 1024);
      if (diskFree < diskSize - expunged + expectedDBSize)
      {
        if (!m_alreadyWarnedDiskSpace)
        {
          folder->ThrowAlertMsg("compactFolderInsufficientSpace", m_window);
          m_alreadyWarnedDiskSpace = true;
        }
        break;
      }
    }

    rv = folder->GetBaseMessageURI(baseMessageURI);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = Init(folder, baseMessageURI.get(), db, path, m_window);
    NS_ENSURE_SUCCESS(rv, rv);

    bool isLocked = true;
    m_folder->GetLocked(&isLocked);
    if (isLocked)
    {
      CleanupTempFilesAfterError();
      m_folder->ThrowAlertMsg("compactFolderDeniedLock", m_window);
      break;
    }

    // If we got here start the real compacting.
    nsCOMPtr<nsISupports> supports = do_QueryInterface(static_cast<nsIMsgFolderCompactor*>(this));
    m_folder->AcquireSemaphore(supports);
    m_totalExpungedBytes += expunged;
    return StartCompacting();

  } while(false); // block for easy skipping the compaction using 'break'

  folder->NotifyCompactCompleted();
  if (m_compactAll)
    return CompactNextFolder();
  else
    return NS_OK;
}

nsresult nsFolderCompactState::ShowStatusMsg(const nsString& aMsg)
{
  nsCOMPtr <nsIMsgStatusFeedback> statusFeedback;
  if (m_window)
  {
    m_window->GetStatusFeedback(getter_AddRefs(statusFeedback));
    if (statusFeedback && !aMsg.IsEmpty())
      return statusFeedback->SetStatusString(aMsg);
  }
  return NS_OK;
}

nsresult
nsFolderCompactState::Init(nsIMsgFolder *folder, const char *baseMsgUri, nsIMsgDatabase *db,
                           nsIFile *path, nsIMsgWindow *aMsgWindow)
{
  nsresult rv;

  m_folder = folder;
  m_baseMessageUri = baseMsgUri;
  m_file = do_CreateInstance(NS_LOCAL_FILE_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);
  m_file->InitWithFile(path);
  // need to make sure the temp file goes in the same real directory
  // as the original file, so resolve sym links.
  m_file->SetFollowLinks(true);

  m_file->SetNativeLeafName(NS_LITERAL_CSTRING("nstmp"));
  rv = m_file->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 00600);   //make sure we are not crunching existing nstmp file
  NS_ENSURE_SUCCESS(rv, rv);

  m_window = aMsgWindow;
  m_keyArray = new nsMsgKeyArray;
  m_size = 0;
  m_totalMsgSize = 0;
  rv = InitDB(db);
  if (NS_FAILED(rv))
  {
    CleanupTempFilesAfterError();
    return rv;
  }

  m_curIndex = 0;

  rv = MsgNewBufferedFileOutputStream(getter_AddRefs(m_fileStream), m_file, -1, 00600);
  if (NS_FAILED(rv)) 
    m_folder->ThrowAlertMsg("compactFolderWriteFailed", m_window);
  else
    rv = GetMessageServiceFromURI(nsDependentCString(baseMsgUri),
                                getter_AddRefs(m_messageService));
  if (NS_FAILED(rv))
  {
    m_status = rv;
  }
  return rv;
}

void nsFolderCompactState::ShowCompactingStatusMsg()
{
  nsString statusString;
  nsresult rv = m_folder->GetStringWithFolderNameFromBundle("compactingFolder", statusString);
  if (!statusString.IsEmpty() && NS_SUCCEEDED(rv))
    ShowStatusMsg(statusString);
}

NS_IMETHODIMP nsFolderCompactState::OnStartRunningUrl(nsIURI *url)
{
  return NS_OK;
}

NS_IMETHODIMP nsFolderCompactState::OnStopRunningUrl(nsIURI *url, nsresult status)
{
  if (m_parsingFolder)
  {
    m_parsingFolder = false;
    if (NS_SUCCEEDED(status))
      status = Compact(m_folder, m_compactingOfflineFolders, m_listener, m_window);
    else if (m_compactAll)
      CompactNextFolder();
  }
  else if (m_compactAll) // this should be the imap case only
  {
    nsCOMPtr <nsIMsgFolder> prevFolder = do_QueryElementAt(m_folderArray,
                                                           m_folderIndex);
    if (prevFolder)
      prevFolder->SetMsgDatabase(nullptr);
    CompactNextFolder();
  }
  else if (m_listener)
  {
    CompactCompleted(status);
  }
  return NS_OK;
}

nsresult nsFolderCompactState::StartCompacting()
{
  nsCOMPtr<nsIMsgPluggableStore> msgStore;
  nsCOMPtr<nsIMsgIncomingServer> server;
  
  nsresult rv = m_folder->GetServer(getter_AddRefs(server));
  NS_ENSURE_SUCCESS(rv, rv);
  rv = server->GetMsgStore(getter_AddRefs(msgStore));
  NS_ENSURE_SUCCESS(rv, rv);
  
  // Notify that compaction is beginning.  We do this even if there are no
  // messages to be copied because the summary database still gets blown away
  // which is still pretty interesting.  (And we like consistency.)
  nsCOMPtr<nsIMsgFolderNotificationService>
    notifier(do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
  if (notifier)
    notifier->NotifyItemEvent(m_folder,
                              NS_LITERAL_CSTRING("FolderCompactStart"),
                              nullptr);

  // TODO: test whether sorting the messages (m_keyArray) by messageOffset
  // would improve performance on large files (less seeks).
  // The m_keyArray is in the order as stored in DB and on IMAP or News
  // the messages stored on the mbox file are not necessarily in the same order.
  if (m_size > 0)
  {
    nsCOMPtr<nsIURI> notUsed;
    ShowCompactingStatusMsg();
    AddRef();
    rv = m_messageService->CopyMessages(m_size, m_keyArray->m_keys.Elements(),
                                        m_folder, this,
                                        false, nullptr, m_window,
                                        getter_AddRefs(notUsed));
  }
  else
  { // no messages to copy with
    FinishCompact();
//    Release(); // we don't "own" ourselves yet.
  }
  return rv;
}

nsresult
nsFolderCompactState::FinishCompact()
{
  NS_ENSURE_TRUE(m_folder, NS_ERROR_NOT_INITIALIZED);
  NS_ENSURE_TRUE(m_file, NS_ERROR_NOT_INITIALIZED);

  // All okay time to finish up the compact process
  nsCOMPtr<nsIFile> path;
  nsCOMPtr<nsIDBFolderInfo> folderInfo;

  // get leaf name and database name of the folder
  nsresult rv = m_folder->GetFilePath(getter_AddRefs(path));
  nsCOMPtr <nsIFile> folderPath = do_CreateInstance(NS_LOCAL_FILE_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = folderPath->InitWithFile(path);
  NS_ENSURE_SUCCESS(rv, rv);
  // need to make sure we put the .msf file in the same directory
  // as the original mailbox, so resolve symlinks.
  folderPath->SetFollowLinks(true);

  nsCOMPtr <nsIFile> oldSummaryFile;
  rv = GetSummaryFileLocation(folderPath, getter_AddRefs(oldSummaryFile));
  NS_ENSURE_SUCCESS(rv, rv);
  nsAutoCString dbName;
  oldSummaryFile->GetNativeLeafName(dbName);
  nsAutoCString folderName;
  path->GetNativeLeafName(folderName);

  // close down the temp file stream; preparing for deleting the old folder
  // and its database; then rename the temp folder and database
  if (m_fileStream)
  {
    m_fileStream->Flush();
    m_fileStream->Close();
    m_fileStream = nullptr;
  }

  // make sure the new database is valid.
  // Close it so we can rename the .msf file.
  if (m_db)
  {
    m_db->ForceClosed();
    m_db = nullptr;
  }

  nsCOMPtr <nsIFile> newSummaryFile;
  rv = GetSummaryFileLocation(m_file, getter_AddRefs(newSummaryFile));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr <nsIDBFolderInfo> transferInfo;
  m_folder->GetDBTransferInfo(getter_AddRefs(transferInfo));

  // close down database of the original folder
  m_folder->ForceDBClosed();

  nsCOMPtr<nsIFile> cloneFile;
  int64_t fileSize = 0;
  rv = m_file->Clone(getter_AddRefs(cloneFile));
  if (NS_SUCCEEDED(rv))
    rv = cloneFile->GetFileSize(&fileSize);
  bool tempFileRightSize = ((uint64_t)fileSize == m_totalMsgSize);
  NS_WARNING_ASSERTION(tempFileRightSize, "temp file not of expected size in compact");

  bool folderRenameSucceeded = false;
  bool msfRenameSucceeded = false;
  if (NS_SUCCEEDED(rv) && tempFileRightSize)
  {
    // First we're going to try and move the old summary file out the way.
    // We don't delete it yet, as we want to keep the files in sync.
    nsCOMPtr<nsIFile> tempSummaryFile;
    rv = oldSummaryFile->Clone(getter_AddRefs(tempSummaryFile));
    if (NS_SUCCEEDED(rv))
      rv = tempSummaryFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);

    nsAutoCString tempSummaryFileName;
    if (NS_SUCCEEDED(rv))
      rv = tempSummaryFile->GetNativeLeafName(tempSummaryFileName);

    if (NS_SUCCEEDED(rv))
      rv = oldSummaryFile->MoveToNative((nsIFile*) nullptr, tempSummaryFileName);

    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "error moving compacted folder's db out of the way");
    if (NS_SUCCEEDED(rv))
    {
      // Now we've successfully moved the summary file out the way, try moving
      // the newly compacted message file over the old one.
      rv = m_file->MoveToNative((nsIFile *) nullptr, folderName);
      folderRenameSucceeded = NS_SUCCEEDED(rv);
      NS_WARNING_ASSERTION(folderRenameSucceeded, "error renaming compacted folder");
      if (folderRenameSucceeded)
      {
        // That worked, so land the new summary file in the right place.
        nsCOMPtr<nsIFile> renamedCompactedSummaryFile;
        newSummaryFile->Clone(getter_AddRefs(renamedCompactedSummaryFile));
        if (renamedCompactedSummaryFile)
        {
          rv = renamedCompactedSummaryFile->MoveToNative((nsIFile *) nullptr, dbName);
          msfRenameSucceeded = NS_SUCCEEDED(rv);
        }
        NS_WARNING_ASSERTION(msfRenameSucceeded, "error renaming compacted folder's db");
      }

      if (!msfRenameSucceeded)
      {
        // Do our best to put the summary file back to where it was
        rv = tempSummaryFile->MoveToNative((nsIFile*) nullptr, dbName);
        if (NS_SUCCEEDED(rv))
          tempSummaryFile = nullptr; // flagging that a renamed db no longer exists
        else
          NS_WARNING("error restoring uncompacted folder's db");
      }
    }
    // We don't want any temporarily renamed summary file to lie around
    if (tempSummaryFile)
      tempSummaryFile->Remove(false);
  }

  NS_WARNING_ASSERTION(msfRenameSucceeded, "compact failed");
  nsresult rvReleaseFolderLock = ReleaseFolderLock();
  NS_WARNING_ASSERTION(NS_SUCCEEDED(rvReleaseFolderLock),"folder lock not released successfully");
  rv = NS_FAILED(rv) ? rv : rvReleaseFolderLock;

  // Cleanup of nstmp-named compacted files if failure
  if (!folderRenameSucceeded)
  {
    // remove the abandoned compacted version with the wrong name
    m_file->Remove(false);
  }
  if (!msfRenameSucceeded)
  {
    // remove the abandoned compacted summary file
    newSummaryFile->Remove(false);
  }

  if (msfRenameSucceeded)
  {
    // Transfer local db information from transferInfo
    nsCOMPtr<nsIMsgDBService> msgDBService =
      do_GetService(NS_MSGDB_SERVICE_CONTRACTID, &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = msgDBService->OpenFolderDB(m_folder, true, getter_AddRefs(m_db));
    NS_ENSURE_TRUE(m_db, NS_FAILED(rv) ? rv : NS_ERROR_FAILURE);
    // These errors are expected.
    rv = (rv == NS_MSG_ERROR_FOLDER_SUMMARY_MISSING ||
          rv == NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE) ? NS_OK : rv;
    m_db->SetSummaryValid(true);
    m_folder->SetDBTransferInfo(transferInfo);

    // since we're transferring info from the old db, we need to reset the expunged bytes
    nsCOMPtr<nsIDBFolderInfo> dbFolderInfo;
    m_db->GetDBFolderInfo(getter_AddRefs(dbFolderInfo));
    if(dbFolderInfo)
      dbFolderInfo->SetExpungedBytes(0);
  }
  if (m_db)
    m_db->Close(true);
  m_db = nullptr;

  // Notify that compaction of the folder is completed.
  nsCOMPtr<nsIMsgFolderNotificationService>
    notifier(do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
  if (notifier)
    notifier->NotifyItemEvent(m_folder,
                              NS_LITERAL_CSTRING("FolderCompactFinish"),
                              nullptr);
  m_folder->NotifyCompactCompleted();

  if (m_compactAll)
    rv = CompactNextFolder();
  else
    CompactCompleted(rv);
      
  return rv;
}

nsresult
GetBaseStringBundle(nsIStringBundle **aBundle)
{
  NS_ENSURE_ARG_POINTER(aBundle);
  nsCOMPtr<nsIStringBundleService> bundleService =
    mozilla::services::GetStringBundleService();
  NS_ENSURE_TRUE(bundleService, NS_ERROR_UNEXPECTED);
  nsCOMPtr<nsIStringBundle> bundle;
  return bundleService->CreateBundle(
    "chrome://messenger/locale/messenger.properties", aBundle);
}

void nsFolderCompactState::CompactCompleted(nsresult exitCode)
{
  NS_WARNING_ASSERTION(NS_SUCCEEDED(exitCode),
                       "nsFolderCompactState::CompactCompleted failed");
  if (m_listener)
    m_listener->OnStopRunningUrl(nullptr, exitCode);
  ShowDoneStatus();
}

nsresult
nsFolderCompactState::ReleaseFolderLock()
{
  nsresult result = NS_OK;
  if (!m_folder) return result;
  bool haveSemaphore;
  nsCOMPtr <nsISupports> supports = do_QueryInterface(static_cast<nsIMsgFolderCompactor*>(this));
  result = m_folder->TestSemaphore(supports, &haveSemaphore);
  if(NS_SUCCEEDED(result) && haveSemaphore)
    result = m_folder->ReleaseSemaphore(supports);
  return result;
}

void nsFolderCompactState::ShowDoneStatus()
{
  if (m_folder)
  {
    nsString statusString;
    nsCOMPtr <nsIStringBundle> bundle;
    nsresult rv = GetBaseStringBundle(getter_AddRefs(bundle));
    NS_ENSURE_SUCCESS_VOID(rv);
    nsAutoString expungedAmount;
    FormatFileSize(m_totalExpungedBytes, true, expungedAmount);
    const char16_t* params[] = { expungedAmount.get() };
    rv = bundle->FormatStringFromName(u"compactingDone",
                                      params, 1, getter_Copies(statusString));

    if (!statusString.IsEmpty() && NS_SUCCEEDED(rv))
      ShowStatusMsg(statusString);
  }
}

nsresult
nsFolderCompactState::CompactNextFolder()
{
  m_folderIndex++;
  uint32_t cnt = 0;
  nsresult rv = m_folderArray->GetLength(&cnt);
  NS_ENSURE_SUCCESS(rv, rv);
  // m_folderIndex might be > cnt if we compact offline stores,
  // and get back here from OnStopRunningUrl.
  if (m_folderIndex >= cnt)
  {
    if (!m_compactOfflineAlso || m_compactingOfflineFolders)
    {
      CompactCompleted(NS_OK);
      return rv;
    }
    m_compactingOfflineFolders = true;
    nsCOMPtr<nsIMsgFolder> folder = do_QueryElementAt(m_folderArray,
                                                      m_folderIndex-1, &rv);
    if (NS_SUCCEEDED(rv) && folder)
      return folder->CompactAllOfflineStores(this, m_window, m_offlineFolderArray);
    else
      NS_WARNING("couldn't get folder to compact offline stores");

  }
  nsCOMPtr<nsIMsgFolder> folder = do_QueryElementAt(m_folderArray,
                                                    m_folderIndex, &rv);

  if (NS_SUCCEEDED(rv) && folder)
    rv = Compact(folder, m_compactingOfflineFolders, m_listener, m_window);
  else
    CompactCompleted(rv);
  return rv;
}

nsresult
nsFolderCompactState::GetMessage(nsIMsgDBHdr **message)
{
  return GetMsgDBHdrFromURI(m_messageUri.get(), message);
}


NS_IMETHODIMP
nsFolderCompactState::OnStartRequest(nsIRequest *request, nsISupports *ctxt)
{
  return StartMessage();
}

NS_IMETHODIMP
nsFolderCompactState::OnStopRequest(nsIRequest *request, nsISupports *ctxt,
                                    nsresult status)
{
  nsCOMPtr<nsIMsgDBHdr> msgHdr;
  if (NS_FAILED(status))
  {
    m_status = status; // set the m_status to status so the destructor can remove the
                       // temp folder and database
    CleanupTempFilesAfterError();
    m_folder->NotifyCompactCompleted();
    ReleaseFolderLock();
    m_folder->ThrowAlertMsg("compactFolderWriteFailed", m_window);
  }
  else
  {
    EndCopy(nullptr, status);
    if (m_curIndex >= m_size)
    {
      msgHdr = nullptr;
      // no more to copy finish it up
      FinishCompact();
    }
    else
    {
      // in case we're not getting an error, we still need to pretend we did get an error,
      // because the compact did not successfully complete.
      m_folder->NotifyCompactCompleted();
      CleanupTempFilesAfterError();
      ReleaseFolderLock();
    }
  }
  Release(); // kill self
  return status;
}

NS_IMETHODIMP
nsFolderCompactState::OnDataAvailable(nsIRequest *request, nsISupports *ctxt,
                                      nsIInputStream *inStr,
                                      uint64_t sourceOffset, uint32_t count)
{
  if (!m_fileStream || !inStr) 
    return NS_ERROR_FAILURE;

  nsresult rv = NS_OK;
  uint32_t msgFlags;
  bool checkForKeyword = m_startOfMsg;
  bool addKeywordHdr = false;
  uint32_t needToGrowKeywords = 0;
  uint32_t statusOffset;
  nsCString msgHdrKeywords;

  if (m_startOfMsg)
  {
    m_statusOffset = 0;
    m_addedHeaderSize = 0;
    m_messageUri.Truncate(); // clear the previous message uri
    if (NS_SUCCEEDED(BuildMessageURI(m_baseMessageUri.get(), m_keyArray->m_keys[m_curIndex],
                                m_messageUri)))
    {
      rv = GetMessage(getter_AddRefs(m_curSrcHdr));
      NS_ENSURE_SUCCESS(rv, rv);
      if (m_curSrcHdr)
      {
        (void) m_curSrcHdr->GetFlags(&msgFlags);
        (void) m_curSrcHdr->GetStatusOffset(&statusOffset);
        
        if (statusOffset == 0)
          m_needStatusLine = true;
        // x-mozilla-status lines should be at the start of the headers, and the code
        // below assumes everything will fit in m_dataBuffer - if there's not
        // room, skip the keyword stuff.
        if (statusOffset > sizeof(m_dataBuffer) - 1024)
        {
          checkForKeyword = false;
          NS_ASSERTION(false, "status offset past end of read buffer size");
          
        }
      }
    }
    m_startOfMsg = false;
  }
  uint32_t maxReadCount, readCount, writeCount;
  uint32_t bytesWritten;
  
  while (NS_SUCCEEDED(rv) && (int32_t) count > 0)
  {
    maxReadCount = count > sizeof(m_dataBuffer) - 1 ? sizeof(m_dataBuffer) - 1 : count;
    writeCount = 0;
    rv = inStr->Read(m_dataBuffer, maxReadCount, &readCount);
    
    // if status offset is past the number of bytes we read, it's probably bogus,
    // and we shouldn't do any of the keyword stuff.
    if (statusOffset + X_MOZILLA_STATUS_LEN > readCount)
      checkForKeyword = false;
    
    if (NS_SUCCEEDED(rv))
    {
      if (checkForKeyword)
      {
        // make sure that status offset really points to x-mozilla-status line
        if  (!strncmp(m_dataBuffer + statusOffset, X_MOZILLA_STATUS, X_MOZILLA_STATUS_LEN))
        {
          const char *keywordHdr = PL_strnrstr(m_dataBuffer, HEADER_X_MOZILLA_KEYWORDS, readCount);
          if (keywordHdr)
            m_curSrcHdr->GetUint32Property("growKeywords", &needToGrowKeywords);
          else
            addKeywordHdr = true;
          m_curSrcHdr->GetStringProperty("keywords", getter_Copies(msgHdrKeywords));
        }
        checkForKeyword = false;
      }
      uint32_t blockOffset = 0;
      if (m_needStatusLine)
      {
        m_needStatusLine = false;
        // we need to parse out the "From " header, write it out, then 
        // write out the x-mozilla-status headers, and set the 
        // status offset of the dest hdr for later use 
        // in OnEndCopy).
        if (!strncmp(m_dataBuffer, "From ", 5))
        {
          blockOffset = 5;
          // skip from line
          MsgAdvanceToNextLine(m_dataBuffer, blockOffset, readCount);
          char statusLine[50];
          m_fileStream->Write(m_dataBuffer, blockOffset, &writeCount);
          m_statusOffset = blockOffset;
          PR_snprintf(statusLine, sizeof(statusLine), X_MOZILLA_STATUS_FORMAT MSG_LINEBREAK, msgFlags & 0xFFFF);
          m_fileStream->Write(statusLine, strlen(statusLine), &m_addedHeaderSize);
          PR_snprintf(statusLine, sizeof(statusLine), X_MOZILLA_STATUS2_FORMAT MSG_LINEBREAK, msgFlags & 0xFFFF0000);
          m_fileStream->Write(statusLine, strlen(statusLine), &bytesWritten);
          m_addedHeaderSize += bytesWritten;
        }
        else
        {
          NS_ASSERTION(false, "not an envelope");
          // try to mark the db as invalid so it will be reparsed.
          nsCOMPtr <nsIMsgDatabase> srcDB;
          m_folder->GetMsgDatabase(getter_AddRefs(srcDB));
          if (srcDB)
          {
            srcDB->SetSummaryValid(false);
            srcDB->ForceClosed();
          }
        }
      }
#define EXTRA_KEYWORD_HDR "                                                                                 " MSG_LINEBREAK

       // if status offset isn't in the first block, this code won't work. There's no good reason
      // for the status offset not to be at the beginning of the message anyway.
      if (addKeywordHdr)
      {
        // if blockOffset is set, we added x-mozilla-status headers so
        // file pointer is already past them.
        if (!blockOffset)
        {
          blockOffset = statusOffset;
          // skip x-mozilla-status and status2 lines.
          MsgAdvanceToNextLine(m_dataBuffer, blockOffset, readCount);
          MsgAdvanceToNextLine(m_dataBuffer, blockOffset, readCount);
          // need to rewrite the headers up to and including the x-mozilla-status2 header
          m_fileStream->Write(m_dataBuffer, blockOffset, &writeCount);
        }
        // we should write out the existing keywords from the msg hdr, if any.
        if (msgHdrKeywords.IsEmpty())
        { // no keywords, so write blank header
          m_fileStream->Write(X_MOZILLA_KEYWORDS, sizeof(X_MOZILLA_KEYWORDS) - 1, &bytesWritten);
          m_addedHeaderSize += bytesWritten;
        }
        else
        {
          if (msgHdrKeywords.Length() < sizeof(X_MOZILLA_KEYWORDS) - sizeof(HEADER_X_MOZILLA_KEYWORDS) + 10 /* allow some slop */)
          { // keywords fit in normal blank header, so replace blanks in keyword hdr with keywords
            nsAutoCString keywordsHdr(X_MOZILLA_KEYWORDS);
            keywordsHdr.Replace(sizeof(HEADER_X_MOZILLA_KEYWORDS) + 1, msgHdrKeywords.Length(), msgHdrKeywords);
            m_fileStream->Write(keywordsHdr.get(), keywordsHdr.Length(), &bytesWritten);
            m_addedHeaderSize += bytesWritten;
          }
          else
          { // keywords don't fit, so write out keywords on one line and an extra blank line
            nsCString newKeywordHeader(HEADER_X_MOZILLA_KEYWORDS ": ");
            newKeywordHeader.Append(msgHdrKeywords);
            newKeywordHeader.Append(MSG_LINEBREAK EXTRA_KEYWORD_HDR);
            m_fileStream->Write(newKeywordHeader.get(), newKeywordHeader.Length(), &bytesWritten);
            m_addedHeaderSize += bytesWritten;
          }
        }
        addKeywordHdr = false;
      }
      else if (needToGrowKeywords)
      {
        blockOffset = statusOffset;
        if (!strncmp(m_dataBuffer + blockOffset, X_MOZILLA_STATUS, X_MOZILLA_STATUS_LEN))
          MsgAdvanceToNextLine(m_dataBuffer, blockOffset, readCount); // skip x-mozilla-status hdr
        if (!strncmp(m_dataBuffer + blockOffset, X_MOZILLA_STATUS2, X_MOZILLA_STATUS2_LEN))
          MsgAdvanceToNextLine(m_dataBuffer, blockOffset, readCount); // skip x-mozilla-status2 hdr
        uint32_t preKeywordBlockOffset = blockOffset;
        if (!strncmp(m_dataBuffer + blockOffset, HEADER_X_MOZILLA_KEYWORDS, sizeof(HEADER_X_MOZILLA_KEYWORDS) - 1))
        {
          do
          {
            // skip x-mozilla-keywords hdr and any existing continuation headers
            MsgAdvanceToNextLine(m_dataBuffer, blockOffset, readCount);
          }
          while (m_dataBuffer[blockOffset] == ' ');
        }
        int32_t oldKeywordSize = blockOffset - preKeywordBlockOffset;

        // rewrite the headers up to and including the x-mozilla-status2 header
        m_fileStream->Write(m_dataBuffer, preKeywordBlockOffset, &writeCount);
        // let's just rewrite all the keywords on several lines and add a blank line,
        // instead of worrying about which are missing.
        bool done = false;
        nsAutoCString keywordHdr(HEADER_X_MOZILLA_KEYWORDS ": ");
        int32_t nextBlankOffset = 0;
        int32_t curHdrLineStart = 0;
        int32_t newKeywordSize = 0;
        while (!done)
        {
          nextBlankOffset = msgHdrKeywords.FindChar(' ', nextBlankOffset);
          if (nextBlankOffset == kNotFound)
          {
            nextBlankOffset = msgHdrKeywords.Length();
            done = true;
          }
          if (nextBlankOffset - curHdrLineStart > 90 || done)
          {
            keywordHdr.Append(nsDependentCSubstring(msgHdrKeywords, curHdrLineStart, msgHdrKeywords.Length() - curHdrLineStart));
            keywordHdr.Append(MSG_LINEBREAK);
            m_fileStream->Write(keywordHdr.get(), keywordHdr.Length(), &bytesWritten);
            newKeywordSize += bytesWritten;
            curHdrLineStart = nextBlankOffset;
            keywordHdr.Assign(' ');
          }
          nextBlankOffset++;
        }
        m_fileStream->Write(EXTRA_KEYWORD_HDR, sizeof(EXTRA_KEYWORD_HDR) - 1, &bytesWritten);
        newKeywordSize += bytesWritten;
        m_addedHeaderSize += newKeywordSize - oldKeywordSize;
        m_curSrcHdr->SetUint32Property("growKeywords", 0);
        needToGrowKeywords = false;
        writeCount += blockOffset - preKeywordBlockOffset; // fudge writeCount

      }
      if (readCount <= blockOffset)
      {
        NS_ASSERTION(false, "bad block offset");
        // not sure what to do to handle this.
      
      }
      m_fileStream->Write(m_dataBuffer + blockOffset, readCount - blockOffset, &bytesWritten);
      writeCount += bytesWritten;
      count -= readCount;
      if (writeCount != readCount)
        return NS_MSG_ERROR_WRITING_MAIL_FOLDER;
    }
  }
  return rv;
}

nsOfflineStoreCompactState::nsOfflineStoreCompactState()
{
}

nsOfflineStoreCompactState::~nsOfflineStoreCompactState()
{
}


nsresult
nsOfflineStoreCompactState::InitDB(nsIMsgDatabase *db)
{
  // Start with the list of messages we have offline as the possible
  // message to keep when compacting the offline store.
  db->ListAllOfflineMsgs(m_keyArray);
  m_size = m_keyArray->m_keys.Length();
  m_db = db;
  return NS_OK;
}

/**
 * This will copy one message to the offline store, but if it fails to
 * copy the next message, it will keep trying messages until it finds one
 * it can copy, or it runs out of messages.
 */
nsresult nsOfflineStoreCompactState::CopyNextMessage(bool &done)
{
  while (m_curIndex < m_size)
  {
    // Filter out msgs that have the "pendingRemoval" attribute set.
    nsCOMPtr<nsIMsgDBHdr> hdr;
    nsString pendingRemoval;
    nsresult rv = m_db->GetMsgHdrForKey(m_keyArray->m_keys[m_curIndex], getter_AddRefs(hdr));
    NS_ENSURE_SUCCESS(rv, rv);
    hdr->GetProperty("pendingRemoval", pendingRemoval);
    if (!pendingRemoval.IsEmpty())
    {
      m_curIndex++;
      // Turn off offline flag for message, since after the compact is completed;
      // we won't have the message in the offline store.
      uint32_t resultFlags;
      hdr->AndFlags(~nsMsgMessageFlags::Offline, &resultFlags);
      // We need to clear this in case the user changes the offline retention
      // settings.
      hdr->SetStringProperty("pendingRemoval", "");
      continue;
    }
    m_messageUri.Truncate(); // clear the previous message uri
    rv = BuildMessageURI(m_baseMessageUri.get(), m_keyArray->m_keys[m_curIndex],
                                  m_messageUri);
    NS_ENSURE_SUCCESS(rv, rv);
    m_startOfMsg = true;
    nsCOMPtr<nsISupports> thisSupports;
    QueryInterface(NS_GET_IID(nsISupports), getter_AddRefs(thisSupports));
    nsCOMPtr<nsIURI> dummyNull;
    rv = m_messageService->StreamMessage(m_messageUri.get(), thisSupports, m_window, nullptr,
                                    false, EmptyCString(), true, getter_AddRefs(dummyNull));
    // if copy fails, we clear the offline flag on the source message.
    if (NS_FAILED(rv))
    {
      nsCOMPtr<nsIMsgDBHdr> hdr;
      GetMessage(getter_AddRefs(hdr));
      if (hdr)
      {
        uint32_t resultFlags;
        hdr->AndFlags(~nsMsgMessageFlags::Offline, &resultFlags);
      }
      m_curIndex++;
      continue;
    }
    else
      break;
  }
  done = m_curIndex >= m_size;
  // In theory, we might be able to stream the next message, so
  // return NS_OK, not rv.
  return NS_OK;
}

NS_IMETHODIMP
nsOfflineStoreCompactState::OnStopRequest(nsIRequest *request, nsISupports *ctxt,
                                          nsresult status)
{
  nsresult rv = status;
  nsCOMPtr<nsIURI> uri;
  nsCOMPtr<nsIMsgDBHdr> msgHdr;
  nsCOMPtr <nsIMsgStatusFeedback> statusFeedback;
  bool done = false;

  // The NS_MSG_ERROR_MSG_NOT_OFFLINE error should allow us to continue, so we
  // check for it specifically and don't terminate the compaction.
  if (NS_FAILED(rv) && rv != NS_MSG_ERROR_MSG_NOT_OFFLINE)
    goto done;
  uri = do_QueryInterface(ctxt, &rv);
  if (NS_FAILED(rv)) goto done;
  rv = GetMessage(getter_AddRefs(msgHdr));
  if (NS_FAILED(rv)) goto done;

  // This is however an unexpected condition, so let's print a warning.
  if (rv == NS_MSG_ERROR_MSG_NOT_OFFLINE) {
    nsAutoCString spec;
    uri->GetSpec(spec);
    nsPrintfCString msg("Message expectedly not available offline: %s", spec.get());
    NS_WARNING(msg.get());
  }

  if (msgHdr)
  {
    if (NS_SUCCEEDED(status))
    {
      msgHdr->SetMessageOffset(m_startOfNewMsg);
      char storeToken[100];
      PR_snprintf(storeToken, sizeof(storeToken), "%lld", m_startOfNewMsg);
      msgHdr->SetStringProperty("storeToken", storeToken);
      msgHdr->SetOfflineMessageSize(m_offlineMsgSize);
    }
    else
    {
      uint32_t resultFlags;
      msgHdr->AndFlags(~nsMsgMessageFlags::Offline, &resultFlags);
    }
  }

  if (m_window)
  {
    m_window->GetStatusFeedback(getter_AddRefs(statusFeedback));
    if (statusFeedback)
      statusFeedback->ShowProgress(100 * m_curIndex / m_size);
  }
  // advance to next message
  m_curIndex++;
  rv = CopyNextMessage(done);
  if (done)
  {
    m_db->Commit(nsMsgDBCommitType::kCompressCommit);
    msgHdr = nullptr;
    // no more to copy finish it up
    ReleaseFolderLock();
    FinishCompact();
    Release(); // kill self
  }

done:
  if (NS_FAILED(rv)) {
    m_status = rv; // set the status to rv so the destructor can remove the
                   // temp folder and database
    ReleaseFolderLock();
    Release(); // kill self
    return rv;
  }
  return rv;
}
 

nsresult
nsOfflineStoreCompactState::FinishCompact()
{
  // All okay time to finish up the compact process
  nsCOMPtr<nsIFile> path;
  uint32_t flags;

    // get leaf name and database name of the folder
  m_folder->GetFlags(&flags);
  nsresult rv = m_folder->GetFilePath(getter_AddRefs(path));

  nsCString leafName;
  path->GetNativeLeafName(leafName);

  if (m_fileStream)
  {
    // close down the temp file stream; preparing for deleting the old folder
    // and its database; then rename the temp folder and database
    m_fileStream->Flush();
    m_fileStream->Close();
    m_fileStream = nullptr;
  }

    // make sure the new database is valid
  nsCOMPtr <nsIDBFolderInfo> dbFolderInfo;
  m_db->GetDBFolderInfo(getter_AddRefs(dbFolderInfo));
  if (dbFolderInfo)
    dbFolderInfo->SetExpungedBytes(0);
  // this forces the m_folder to update mExpungedBytes from the db folder info.
  int64_t expungedBytes;
  m_folder->GetExpungedBytes(&expungedBytes);
  m_folder->UpdateSummaryTotals(true);
  m_db->SetSummaryValid(true);

    // remove the old folder 
  path->Remove(false);

    // rename the copied folder to be the original folder 
  m_file->MoveToNative((nsIFile *) nullptr, leafName);

  ShowStatusMsg(EmptyString());
  m_folder->NotifyCompactCompleted();
  if (m_compactAll)
    rv = CompactNextFolder();
  return rv;
}


NS_IMETHODIMP
nsFolderCompactState::Init(nsIMsgFolder *srcFolder, nsICopyMessageListener *destination, nsISupports *listenerData)
{
  return NS_OK;
}

NS_IMETHODIMP
nsFolderCompactState::StartMessage()
{
  nsresult rv = NS_ERROR_FAILURE;
  NS_ASSERTION(m_fileStream, "Fatal, null m_fileStream...\n");
  if (m_fileStream)
  {
    nsCOMPtr <nsISeekableStream> seekableStream = do_QueryInterface(m_fileStream, &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    // this will force an internal flush, but not a sync. Tell should really do an internal flush,
    // but it doesn't, and I'm afraid to change that nsIFileStream.cpp code anymore.
    seekableStream->Seek(nsISeekableStream::NS_SEEK_CUR, 0);
    // record the new message key for the message
    int64_t curStreamPos;
    seekableStream->Tell(&curStreamPos);
    m_startOfNewMsg = curStreamPos;
    rv = NS_OK;
  }
  return rv;
}

NS_IMETHODIMP
nsFolderCompactState::EndMessage(nsMsgKey key)
{
  return NS_OK;
}

NS_IMETHODIMP
nsFolderCompactState::EndCopy(nsISupports *url, nsresult aStatus)
{
  nsCOMPtr<nsIMsgDBHdr> msgHdr;
  nsCOMPtr<nsIMsgDBHdr> newMsgHdr;

  if (m_curIndex >= m_size)
  {
    NS_ASSERTION(false, "m_curIndex out of bounds");
    return NS_OK;
  }

  /**
   * Done with the current message; copying the existing message header
   * to the new database.
   */
  if (m_curSrcHdr)
  {
    nsMsgKey key;
    m_curSrcHdr->GetMessageKey(&key);
    m_db->CopyHdrFromExistingHdr(key, m_curSrcHdr, true,
                                 getter_AddRefs(newMsgHdr));
  }
  m_curSrcHdr = nullptr;
  if (newMsgHdr)
  {
    if (m_statusOffset != 0)
      newMsgHdr->SetStatusOffset(m_statusOffset);

    char storeToken[100];
    PR_snprintf(storeToken, sizeof(storeToken), "%lld", m_startOfNewMsg);
    newMsgHdr->SetStringProperty("storeToken", storeToken);
    newMsgHdr->SetMessageOffset(m_startOfNewMsg);

    uint32_t msgSize;
    (void) newMsgHdr->GetMessageSize(&msgSize);
    if (m_addedHeaderSize)
    {
      msgSize += m_addedHeaderSize;
      newMsgHdr->SetMessageSize(msgSize);
    }
    m_totalMsgSize += msgSize;
  }

//  m_db->Commit(nsMsgDBCommitType::kLargeCommit);  // no sense commiting until the end
  // advance to next message
  m_curIndex ++;
  m_startOfMsg = true;
  nsCOMPtr <nsIMsgStatusFeedback> statusFeedback;
  if (m_window)
  {
    m_window->GetStatusFeedback(getter_AddRefs(statusFeedback));
    if (statusFeedback)
      statusFeedback->ShowProgress(100 * m_curIndex / m_size);
  }
  return NS_OK;
}

nsresult nsOfflineStoreCompactState::StartCompacting()
{
  nsresult rv = NS_OK;
  if (m_size > 0 && m_curIndex == 0)
  {
    AddRef(); // we own ourselves, until we're done, anyway.
    ShowCompactingStatusMsg();
    bool done = false;
    rv = CopyNextMessage(done);
    if (!done)
      return rv;
  }
  ReleaseFolderLock();
  FinishCompact();
  return rv;
}

NS_IMETHODIMP
nsOfflineStoreCompactState::OnDataAvailable(nsIRequest *request, nsISupports *ctxt,
                                            nsIInputStream *inStr,
                                            uint64_t sourceOffset, uint32_t count)
{
  if (!m_fileStream || !inStr) 
    return NS_ERROR_FAILURE;

  nsresult rv = NS_OK;

  if (m_startOfMsg)
  {
    m_statusOffset = 0;
    m_offlineMsgSize = 0;
    m_messageUri.Truncate(); // clear the previous message uri
    if (NS_SUCCEEDED(BuildMessageURI(m_baseMessageUri.get(), m_keyArray->m_keys[m_curIndex],
                                m_messageUri)))
    {
      rv = GetMessage(getter_AddRefs(m_curSrcHdr));
      NS_ENSURE_SUCCESS(rv, rv);
    }
  }
  uint32_t maxReadCount, readCount, writeCount;
  uint32_t bytesWritten;

  while (NS_SUCCEEDED(rv) && (int32_t) count > 0)
  {
    maxReadCount = count > sizeof(m_dataBuffer) - 1 ? sizeof(m_dataBuffer) - 1 : count;
    writeCount = 0;
    rv = inStr->Read(m_dataBuffer, maxReadCount, &readCount);

    if (NS_SUCCEEDED(rv))
    {
      if (m_startOfMsg)
      {
        m_startOfMsg = false;
        // check if there's an envelope header; if not, write one.
        if (strncmp(m_dataBuffer, "From ", 5))
        {
          m_fileStream->Write("From " CRLF, 7, &bytesWritten);
          m_offlineMsgSize += bytesWritten;
        }
      }
      m_fileStream->Write(m_dataBuffer, readCount, &bytesWritten);
      m_offlineMsgSize += bytesWritten;
      writeCount += bytesWritten;
      count -= readCount;
      if (writeCount != readCount)
      {
        m_folder->ThrowAlertMsg("compactFolderWriteFailed", m_window);
        return NS_MSG_ERROR_WRITING_MAIL_FOLDER;
      }
    }
  }
  return rv;
}