aboutsummaryrefslogtreecommitdiffstats
path: root/Lua/src/base/UPath.pas
blob: 03bd82eb6172b34897646a0d6f9ce447814f52f9 (plain) (blame)
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
{* UltraStar Deluxe - Karaoke Game
 *
 * UltraStar Deluxe is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *}

unit UPath;

{$IFDEF FPC}
  {$MODE Delphi}
{$ENDIF}

{$I switches.inc}

interface

uses
  SysUtils,
  Classes,
  IniFiles,
  {$IFDEF MSWINDOWS}
  TntClasses,
  {$ENDIF}
  UConfig,
  UUnicodeUtils;

type
  IPath = interface;

  {**
   * TUnicodeMemoryStream
   *}
  TUnicodeMemoryStream = class(TMemoryStream)
  public
    procedure LoadFromFile(const FileName: IPath);
    procedure SaveToFile(const FileName: IPath);
  end;

  {**
   * Unicode capable IniFile implementation.
   * TMemIniFile and TIniFile are not able to handle INI-files with
   * an UTF-8 BOM. This implementation checks if an UTF-8 BOM exists
   * and removes it from the internal string-list.
   * UTF8Encoded is set accordingly.
   *}
  TUnicodeMemIniFile = class(TMemIniFile)
  private
    FFilename: IPath;
    FUTF8Encoded: boolean;
  public
    constructor Create(const FileName: IPath; UTF8Encoded: boolean = false); reintroduce;
    procedure UpdateFile; override;
    property UTF8Encoded: boolean READ FUTF8Encoded WRITE FUTF8Encoded;
  end;
  
  {**
   * TBinaryFileStream (inherited from THandleStream)
   *}
  {$IFDEF MSWINDOWS}
  TBinaryFileStream = class(TTntFileStream)
  {$ELSE}
  TBinaryFileStream = class(TFileStream)
  {$ENDIF}
  public
    {**
     * @seealso TFileStream.Create for valid Mode parameters
     *}
    constructor Create(const FileName: IPath; Mode: word);
  end;

  {**
   * TTextFileStream
   *}
  TTextFileStream = class(TStream)
  protected
    fLineBreak: RawByteString;
    fFilename: IPath;
    fMode: word;

    function ReadLine(var Success: boolean): RawByteString; overload; virtual; abstract;
  public
    constructor Create(Filename: IPath; Mode: word);

    function ReadString(): RawByteString; virtual; abstract;
    function ReadLine(var Line: UTF8String): boolean; overload;
    function ReadLine(var Line: AnsiString): boolean; overload;

    procedure WriteString(const Str: RawByteString); virtual;
    procedure WriteLine(const Line: RawByteString); virtual;

    property LineBreak: RawByteString read fLineBreak write fLineBreak;
    property Filename: IPath read fFilename;
  end;

  {**
   * TMemTextStream
   *}
  TMemTextFileStream = class(TTextFileStream)
  private
    fStream: TMemoryStream;
  protected
    function GetSize: int64; override;

    {**
     * Copies fStream.Memory from StartPos to EndPos-1 to the result string;
     *}
    function CopyMemString(StartPos: int64; EndPos: int64): RawByteString;
  public
    constructor Create(Filename: IPath; Mode: word);
    destructor Destroy(); override;

    function Read(var Buffer; Count: longint): longint; override;
    function Write(const Buffer; Count: longint): longint; override;
    function Seek(Offset: longint; Origin: word): longint; override;
    function Seek(const Offset: int64; Origin: TSeekOrigin): int64; override;

    function ReadLine(var Success: boolean): RawByteString; override;
    function ReadString(): RawByteString; override;
  end;

  {**
  TUnicodeIniStream = class()
  end;
  *}

  {**
   * pdKeep:   Keep path as is, neither remove or append a delimiter
   * pdAppend: Append a delimiter if path does not have a trailing one 
   * pdRemove: Remove a trailing delimiter from the path 
   *}
  TPathDelimOption = (pdKeep, pdAppend, pdRemove);

  IPathDynArray = array of IPath;

  {**
   * An IPath represents a filename, a directory or a filesystem path in general.
   * It hides some of the operating system's specifics like path delimiters
   * and encodings and provides an easy to use interface to handle them.
   * Internally all paths are stored with the same path delimiter (PathDelim)
   * and encoding (UTF-8). The transformation is already done AT THE CREATION of
   * the IPath and hence calls to e.g. IPath.Equal() will not distinguish between
   * Unix and Windows style paths.
   *
   * Create new paths with one of the Path() functions.
   * If you need a string representation use IPath.ToNative/ToUTF8/ToWide.
   * Note that due to the path-delimiter and encoding transformation the string
   * might have changed. Path('one\test/path').ToUTF8() might return 'one/test/path'.
   *
   * It is recommended to use an IPath as long as possible without a string
   * conversion (IPath.To...()). The whole Delphi (< 2009) and FPC RTL is ANSI
   * only on Windows. If you would use for example FileExists(MyPath.ToNative)
   * it would not find a file which contains characters that are not in the
   * current locale. Same applies to AssignFile(), TFileStream.Create() and
   * everything else in the RTL that expects a filename.
   * As a rule of thumb: NEVER use any of the Delphi/FPC RTL filename functions
   * if the filename parameter is not of a UTF8String or WideString type.
   *
   * If you need to open a file use TBinaryStream or TFileStream instead. Many
   * of the RTL classes offer a LoadFromStream() method so ANSI Open() methods
   * can be workaround.
   *
   * If there is only a ANSI and no IPath/UTF-8/WideString version and you cannot
   * even pass a stream instead of a filename be aware that even if you know that
   * a filename is ASCII only, subdirectories in an absolute path might contain
   * some non-ASCII characters (for example the user's name) and hence might
   * fail (if the characters are not in the current locale).
   * It is rare but it happens.
   *
   * IMPORTANT:
   *   This interface needs the cwstring unit on Unix (Max OS X / Linux) systems.
   *   Cwstring functions (WideUpperCase, ...) cannot be used by external threads
   *   as FPC uses Thread-Local-Storage for the implementation. As a result do not
   *   call IPath stuff by external threads (e.g. in C callbacks or by SDL-threads).
   *}
  IPath = interface
  ['{686BF103-CE43-4598-B85D-A2C3AF950897}']
    {**
     * Returns the path as an UTF8 encoded string.
     * If UseNativeDelim is set to true, the native path delimiter ('\' on win32)
     * is used. If it is set to false the (more) portable '/' delimiter will used.
     *}
    function ToUTF8(UseNativeDelim: boolean = true): UTF8String;

    {**
     * Returns the path as an UTF-16 encoded string.
     * If UseNativeDelim is set to true, the native path delimiter ('\' on win32)
     * is used. If it is set to false the delimiter will be '/'.
     *}
    function ToWide(UseNativeDelim: boolean = true): WideString;

    {**
     * Returns the path with the system's native encoding and path delimiter.
     * Win32: ANSI (use the UTF-16 version IPath.ToWide() whenever possible)
     * Mac:   UTF8
     * Unix:  UTF8 or ANSI according to LC_CTYPE
     *}
    function ToNative(): RawByteString;

    {**
     * Note: File must be closed with FileClose(Handle) after usage
     * @seealso SysUtils.FileOpen()
     *}
    function Open(Mode: longword): THandle;

    {** @seealso SysUtils.ExtractFileDrive() *}
    function GetDrive(): IPath;

    {** @seealso SysUtils.ExtractFilePath() *}
    function GetPath(): IPath;

    {** @seealso SysUtils.ExtractFileDir() *}
    function GetDir(): IPath;

    {** @seealso SysUtils.ExtractFileName() *}
    function GetName(): IPath;

    {** @seealso SysUtils.ExtractFileExtension() *}
    function GetExtension(): IPath;

    {**
     * Returns a copy of the path with the extension changed to Extension.
     * The file itself is not changed, use Rename() for this task.
     * @seealso SysUtils.ChangeFileExt()
     *}
    function SetExtension(const Extension: IPath): IPath; overload;
    function SetExtension(const Extension: RawByteString): IPath; overload;
    function SetExtension(const Extension: WideString): IPath; overload;

    {**
     * Returns the representation of the path relative to Basename.
     * Note that the basename must be terminated with a path delimiter
     * otherwise the last path component will be ignored.
     * @seealso SysUtils.ExtractRelativePath()
     *}
    function GetRelativePath(const BaseName: IPath): IPath;

    {** @seealso SysUtils.ExpandFileName() *}
    function GetAbsolutePath(): IPath;

    {**
     * Returns the concatenation of this path with Child. If this path does not
     * end with a path delimiter one is inserted in front of the Child path.
     * Example: Path('parent').Append(Path('child')) -> Path('parent/child')
     *}
    function Append(const Child: IPath; DelimOption: TPathDelimOption = pdKeep): IPath; overload;
    function Append(const Child: RawByteString; DelimOption: TPathDelimOption = pdKeep): IPath; overload;
    function Append(const Child: WideString; DelimOption: TPathDelimOption = pdKeep): IPath; overload;

    {**
     * Splits the path into its components. Path delimiters are not removed from
     * components. 
     * Example: C:\test\my\dir -> ['C:\', 'test\', 'my\', 'dir']
     *}
    function SplitDirs(): IPathDynArray;

    {**
     * Returns the parent directory or PATH_NONE if none exists.
     *}
    function GetParent(): IPath;

    {**
     * Checks if this path is a subdir of or file inside Parent.
     * If Direct is true this path must be a direct child.
     * Example: C:\test\file is a direct child of C:\test and a child of C:\
     *}
    function IsChildOf(const Parent: IPath; Direct: boolean): boolean;

    {**
     * Adjusts the case of the path on case senstitive filesystems.
     * If the path does not exist or the filesystem is case insensitive
     * the original path will be returned. Otherwise a corrected copy.
     *}
    function AdjustCase(AdjustAllLevels: boolean): IPath;

    {** @seealso SysUtils.IncludeTrailingPathDelimiter() *}
    function AppendPathDelim(): IPath;

    {** @seealso SysUtils.ExcludeTrailingPathDelimiter() *}
    function RemovePathDelim(): IPath;

    function Exists(): boolean;
    function IsFile(): boolean;
    function IsDirectory(): boolean;
    function IsAbsolute(): boolean;
    function GetFileAge(): integer; overload;
    function GetFileAge(out FileDateTime: TDateTime): boolean; overload;
    function GetAttr(): cardinal;
    function SetAttr(Attr: Integer): boolean;
    function IsReadOnly(): boolean;
    function SetReadOnly(ReadOnly: boolean): boolean;

    {**
     * Checks if this path points to nothing, that means the path consists of
     * the empty string '' and hence equals PATH_NONE.
     * This is a shortcut for IPath.Equals('') or IPath.Equals(PATH_NONE).
     * If IsUnset() returns true this path and PATH_NONE are equal but they must
     * not be identical as the references might point to different objects.
     *
     * Example:
     *   Path('').Equals(PATH_EMPTY) -> true
     *   Path('') = PATH_EMPTY       -> false
     *}
    function IsUnset(): boolean;
    function IsSet(): boolean;

    {**
     * Compares this path with Other and returns true if both paths are
     * equal. Both paths are expanded and trailing slashes excluded before
     * comparison. If IgnoreCase is true, the case will be ignored on
     * case-sensitive filesystems.
     *}
    function Equals(const Other: IPath; IgnoreCase: boolean = false): boolean; overload;
    function Equals(const Other: RawByteString; IgnoreCase: boolean = false): boolean; overload;
    function Equals(const Other: WideString; IgnoreCase: boolean = false): boolean; overload;

    {**
     * Searches for a file in DirList. The Result is nil if the file was
     * not found. Use IFileSystem.FileFind() instead if you want to use
     * wildcards.
     * @seealso SysUtils.FileSearch()
     *}
    function FileSearch(const DirList: IPath): IPath;

    {** File must be closed with FileClose(Handle) after usage }
    function CreateFile(): THandle;
    function DeleteFile(): boolean;
    function CreateDirectory(Force: boolean = false): boolean;
    function DeleteEmptyDir(): boolean;
    function Rename(const NewName: IPath): boolean;
    function CopyFile(const Target: IPath; FailIfExists: boolean): boolean;

    // TODO: Dirwatch stuff
    // AddFileChangeListener(Listener: TFileChangeListener);

    {**
     * Internal string representation. For debugging only.
     *}
    function GetIntern: UTF8String;
    property Intern: UTF8String READ GetIntern;
  end;

{**
 * Creates a new path with the given pathname. PathName can be either in UTF8
 * or the local encoding.
 * Notes:
 * - On Apple only UTF8 is supported
 * - Same applies to Unix with LC_CTYPE set to UTF8 encoding (default on newer systems)
 *}
function Path(const PathName: RawByteString; DelimOption: TPathDelimOption = pdKeep): IPath; overload;

{**
 * Creates a new path with the given UTF-16 pathname.
 *}
function Path(const PathName: WideString; DelimOption: TPathDelimOption = pdKeep): IPath; overload;

{**
 * Returns a singleton for Path('').
 *}
function PATH_NONE(): IPath;

implementation

uses
  RTLConsts,
  UTextEncoding,
  UFilesystem;

{*
 * Due to a compiler bug in FPC <= 2.2.4 reference counting does not work
 * properly with interfaces (see http://bugs.freepascal.org/view.php?id=14019).
 *
 * There are two (probably more) scenarios causes a program to crash:
 *
 * 1. Assume we execute Path('fail').GetParent().ToUTF8(). The compiler will
 * internally create a temporary variable to hold the result of Path('fail').
 * This temporary var is then passed as Self to GetParent(). Unfortunately FPC
 * does already decrement the ref-count of the temporary var at the end of the
 * call to Path('fail') and the ref-count drops to zero and the temp object
 * is destroyed as FPC erroneously assumes that the temp is not used anymore.
 * As a result the Self variable in GetParent() will be invalid, the same
 * applies to TPathImpl.fName which reference count dropped to zero when the
 * temp was destroyed. Hence GetParent() will likely crash.
 * If it does not, ToUTF8() will either return some random string
 * (e.g. '' or stupid stuff like 'fhwkjehdk') or crash.
 * Either way the result of ToUTF8() is messed up.
 * This scenario applies whenever a function (or method) is called that returns
 * an interfaced object (e.g. an IPath) and the result is used without storing
 * a reference to it in a (temporary) variable first.
 *
 *  Tmp := Path('fail'); Tmp2 := Tmp.GetParent(); Tmp2.ToUTF8();
 *
 * will not crash but is very impractical and error-prone. Note that Tmp2 cannot
 * be replaced with Tmp (see scenario 2).
 *
 * 2. Another situation this bug will ruin our lives is when a variable to an
 * interfaced object is used at the left and right side of an assignment as in:
 *   MyPath := MyPath.GetParent()
 *
 * Although the bug is already fixed in the FPC development version 2.3.1
 * it will take quite some time till the next FPC release (> 2.2.4) in which
 * this issue is fixed.
 *
 * To workaround this bug we use some very simple and stupid kind of garbage
 * collection. New IPaths are stored in an IInterfaceList (call it GarbaegeList)
 * to artificially increase the ref-count of the newly created object.
 * This keeps the object alive when FPC's temporary variable comes to the end
 * of its lifetime and the object's ref-count is decremented
 * (and is now 1 instead of 0).
 * Later on, the object is either garbage or referenced by another variable.
 *
 * Look at
 *   MyPath := Path('SomeDir/SubDir').GetParent()
 *
 * (1) The result of Path('SomeDir/SubDir') is garbage as it is not used anymore.
 * (2) The result of GetParent() is referenced by MyPath
 * Object (1) has a reference count of 1 (as it is only referenced by the
 * GarbageList). Object (2) is referenced twice (MyPath + GarbageList).
 * When the reference to (2) is finally stored in MyPath we can safely remove
 * (1) and (2) from the GarbageList so (1) will be freed and the ref-count of
 * (2) will be decremented to 1.
 *
 * As we do not know when it is safe to remove an object from the GarbageList
 * we assume that there are max. GarbageMaxCount IPath elements created until
 * the execution of the expression is performed and a reference to the resulting
 * object is assigned to a variable so all temps can be safely deleted.
 *
 * Worst-case scenarios are recursive calls or calls with large call stacks with
 * functions that return an IPath. Also keep in mind that multiple threads might
 * be executing such functions at the same time.
 * A reasonable count might be a max. of 20.000 elements. With an average length
 * of 40 UTF8 chars (maybe 60 byte with class info, pointer etc.) per IPath
 * this will consume ~1.2MB.
 *}
{$IFDEF FPC}
{$IF FPC_VERSION_INT <= 002002004} // <= 2.2.4
  {$DEFINE HAVE_REFCNTBUG}
{$IFEND}
{$ENDIF}

{$IFDEF HAVE_REFCNTBUG}
const
  // when GarbageList.Count reaches GarbageMaxCount the oldest references in
  // GarbageList will be deleted until GarbageList.Count equals GarbageAfterCleanCount.
  GarbageMaxCount = 20000;
  GarbageAfterCleanCount = GarbageMaxCount-1000;

var
  GarbageList: IInterfaceList;
{$ENDIF}

type
  TPathImpl = class(TInterfacedObject, IPath)
    private
      fName: UTF8String; //<** internal filename string, always UTF8 with PathDelim

      {**
       * Unifies the filename. Path-delimiters are replaced by '/'.
       *}
      procedure Unify(DelimOption: TPathDelimOption);

      {**
       * Returns a copy of fName with path delimiters changed to '/'.
       *}
      function GetPortableString(): UTF8String;

      procedure AssertRefCount; {$IFDEF HasInline}inline;{$ENDIF}

    public
      constructor Create(const Name: UTF8String; DelimOption: TPathDelimOption);
      destructor Destroy(); override;

      function ToUTF8(UseNativeDelim: boolean): UTF8String;
      function ToWide(UseNativeDelim: boolean): WideString;
      function ToNative(): RawByteString;

      function Open(Mode: longword): THandle;

      function GetDrive(): IPath;
      function GetPath(): IPath;
      function GetDir(): IPath;
      function GetName(): IPath;
      function GetExtension(): IPath;

      function SetExtension(const Extension: IPath): IPath; overload;
      function SetExtension(const Extension: RawByteString): IPath; overload;
      function SetExtension(const Extension: WideString): IPath; overload;

      function GetRelativePath(const BaseName: IPath): IPath;
      function GetAbsolutePath(): IPath;
      function GetParent(): IPath;
      function SplitDirs(): IPathDynArray;

      function Append(const Child: IPath; DelimOption: TPathDelimOption): IPath; overload;
      function Append(const Child: RawByteString; DelimOption: TPathDelimOption): IPath; overload;
      function Append(const Child: WideString; DelimOption: TPathDelimOption): IPath; overload;

      function Equals(const Other: IPath; IgnoreCase: boolean): boolean; overload;
      function Equals(const Other: RawByteString; IgnoreCase: boolean): boolean; overload;
      function Equals(const Other: WideString; IgnoreCase: boolean): boolean; overload;

      function IsChildOf(const Parent: IPath; Direct: boolean): boolean;

      function AdjustCase(AdjustAllLevels: boolean): IPath;

      function AppendPathDelim(): IPath;
      function RemovePathDelim(): IPath;

      function GetFileAge(): integer; overload;
      function GetFileAge(out FileDateTime: TDateTime): boolean; overload;
      function Exists(): boolean;
      function IsFile(): boolean;
      function IsDirectory(): boolean;
      function IsAbsolute(): boolean;
      function GetAttr(): cardinal;
      function SetAttr(Attr: Integer): boolean;
      function IsReadOnly(): boolean;
      function SetReadOnly(ReadOnly: boolean): boolean;

      function IsUnset(): boolean;
      function IsSet(): boolean;

      function FileSearch(const DirList: IPath): IPath;

      function CreateFile(): THandle;
      function DeleteFile(): boolean;
      function CreateDirectory(Force: boolean): boolean;
      function DeleteEmptyDir(): boolean;
      function Rename(const NewName: IPath): boolean;
      function CopyFile(const Target: IPath; FailIfExists: boolean): boolean;

      function GetIntern(): UTF8String;
  end;

function Path(const PathName: RawByteString; DelimOption: TPathDelimOption): IPath;
begin
  if (IsUTF8String(PathName)) then
    Result := TPathImpl.Create(PathName, DelimOption)
  else if (IsNativeUTF8()) then
    Result := PATH_NONE
  else
    Result := TPathImpl.Create(AnsiToUtf8(PathName), DelimOption);
end;

function Path(const PathName: WideString; DelimOption: TPathDelimOption): IPath;
begin
  Result := TPathImpl.Create(UTF8Encode(PathName), DelimOption);
end;



procedure TPathImpl.AssertRefCount;
begin
  {$IFDEF HAVE_REFCNTBUG}
  if (FRefCount <= 0) then
    raise Exception.Create('RefCount error: ' + IntToStr(FRefCount));
  {$ENDIF}
end;

constructor TPathImpl.Create(const Name: UTF8String; DelimOption: TPathDelimOption);
begin
  inherited Create();
  fName := Name;
  Unify(DelimOption);
  {$IFDEF HAVE_REFCNTBUG}
  GarbageList.Lock;
  if (GarbageList.Count >= GarbageMaxCount) then
  begin
    while (GarbageList.Count > GarbageAfterCleanCount) do
      GarbageList.Delete(0);
  end;
  GarbageList.Add(Self);
  GarbageList.Unlock;
  {$ENDIF}
end;

destructor TPathImpl.Destroy();
begin
  inherited;
end;

procedure TPathImpl.Unify(DelimOption: TPathDelimOption);
var
  I: integer;
begin
  // convert all path delimiters to native ones
  for I := 1 to Length(fName) do
  begin
    if (fName[I] in ['\', '/']) and (fName[I] <> PathDelim) then
      fName[I] := PathDelim;
  end;

  // Include/ExcludeTrailingPathDelimiter need PathDelim as path delimiter 
  case DelimOption of
    pdAppend: fName := IncludeTrailingPathDelimiter(fName);
    pdRemove: fName := ExcludeTrailingPathDelimiter(fName);
  end;
end;

function TPathImpl.GetPortableString(): UTF8String;
var
  I: integer;
begin
  Result := fName;
  if (PathDelim = '/') then
    Exit;

  for I := 1 to Length(Result) do
  begin
    if (Result[I] = PathDelim) then
      Result[I] := '/';
  end;
end;

function TPathImpl.ToUTF8(UseNativeDelim: boolean): UTF8String;
begin
  AssertRefCount;

  if (UseNativeDelim) then
    Result := fName
  else
    Result := GetPortableString();
end;

function TPathImpl.ToWide(UseNativeDelim: boolean): WideString;
begin
  if (UseNativeDelim) then
    Result := UTF8Decode(fName)
  else
    Result := UTF8Decode(GetPortableString());
end;

function TPathImpl.ToNative(): RawByteString;
begin
  if (IsNativeUTF8()) then
    Result := fName
  else
    Result := Utf8ToAnsi(fName);
end;

function TPathImpl.GetDrive(): IPath;
begin
  AssertRefCount;
  Result := FileSystem.ExtractFileDrive(Self);
end;

function TPathImpl.GetPath(): IPath;
begin
  AssertRefCount;
  Result := FileSystem.ExtractFilePath(Self);
end;

function TPathImpl.GetDir(): IPath;
begin
  AssertRefCount;
  Result := FileSystem.ExtractFileDir(Self);
end;

function TPathImpl.GetName(): IPath;
begin
  AssertRefCount;
  Result := FileSystem.ExtractFileName(Self);
end;

function TPathImpl.GetExtension(): IPath;
begin
  AssertRefCount;
  Result := FileSystem.ExtractFileExt(Self);
end;

function TPathImpl.SetExtension(const Extension: IPath): IPath;
begin
  AssertRefCount;
  Result := FileSystem.ChangeFileExt(Self, Extension);
end;

function TPathImpl.SetExtension(const Extension: RawByteString): IPath;
begin
  Result := SetExtension(Path(Extension));
end;

function TPathImpl.SetExtension(const Extension: WideString): IPath;
begin
  Result := SetExtension(Path(Extension));
end;

function TPathImpl.GetRelativePath(const BaseName: IPath): IPath;
begin
  AssertRefCount;
  Result := FileSystem.ExtractRelativePath(BaseName, Self);
end;

function TPathImpl.GetAbsolutePath(): IPath;
begin
  AssertRefCount;
  Result := FileSystem.ExpandFileName(Self);
end;

function TPathImpl.GetParent(): IPath;
var
  CurPath, ParentPath: IPath;
begin
  AssertRefCount;

  Result := PATH_NONE;

  CurPath := Self.RemovePathDelim();
  // check if current path has a parent (no further '/')
  if (Pos(PathDelim, CurPath.ToUTF8()) = 0) then
    Exit;

  // set new path and check if it has changed to avoid endless loops
  // e.g. with invalid paths like '/C:' (GetPath() uses ':' as delimiter too)
  // on delphi/win32
  ParentPath := CurPath.GetPath();
  if (ParentPath.ToUTF8 = CurPath.ToUTF8)  then
    Exit;

  Result := ParentPath;
end;

function TPathImpl.SplitDirs(): IPathDynArray;
var
  CurPath: IPath;
  Components: array of IPath;
  CurPathStr: UTF8String;
  DelimPos: integer;
  I: integer;
begin
  SetLength(Result, 0);

  if (Length(Self.ToUTF8(true)) = 0) then
    Exit;

  CurPath := Self;
  SetLength(Components, 0);
  repeat
    SetLength(Components, Length(Components)+1);

    CurPathStr := CurPath.ToUTF8();
    DelimPos := LastDelimiter(PathDelim, SysUtils.ExcludeTrailingPathDelimiter(CurPathStr));
    Components[High(Components)] := Path(Copy(CurPathStr, DelimPos+1, Length(CurPathStr)));

    CurPath := CurPath.GetParent();
  until (CurPath = PATH_NONE);

  // reverse list
  SetLength(Result, Length(Components));
  for I := 0 to High(Components) do
    Result[I] := Components[High(Components)-I];
end;

function TPathImpl.Append(const Child: IPath; DelimOption: TPathDelimOption): IPath;
var
  TmpResult: IPath;
begin
  AssertRefCount;

  if (fName = '') then
    TmpResult := Child
  else
    TmpResult := Path(Self.AppendPathDelim().ToUTF8() + Child.ToUTF8());

  case DelimOption of
    pdKeep: Result := TmpResult;
    pdAppend: Result := TmpResult.AppendPathDelim;
    pdRemove: Result := TmpResult.RemovePathDelim;
  end;
end;

function TPathImpl.Append(const Child: RawByteString; DelimOption: TPathDelimOption): IPath;
begin
  AssertRefCount;
  Result := Append(Path(Child), DelimOption);
end;

function TPathImpl.Append(const Child: WideString; DelimOption: TPathDelimOption): IPath;
begin
  AssertRefCount;
  Result := Append(Path(Child), DelimOption);
end;

function TPathImpl.Equals(const Other: IPath; IgnoreCase: boolean): boolean;
var
  SelfPath, OtherPath: UTF8String;
begin
  SelfPath := Self.GetAbsolutePath().RemovePathDelim().ToUTF8();
  OtherPath := Other.GetAbsolutePath().RemovePathDelim().ToUTF8();
  if (FileSystem.IsCaseSensitive() and not IgnoreCase) then
    Result := (CompareStr(SelfPath, OtherPath) = 0)
  else
    Result := (CompareText(SelfPath, OtherPath) = 0);
end;

function TPathImpl.Equals(const Other: RawByteString; IgnoreCase: boolean): boolean;
begin
  Result := Equals(Path(Other), IgnoreCase);
end;

function TPathImpl.Equals(const Other: WideString; IgnoreCase: boolean): boolean;
begin
  Result := Equals(Path(Other), IgnoreCase);
end;

function TPathImpl.IsChildOf(const Parent: IPath; Direct: boolean): boolean;
var
  SelfPath, ParentPath: UTF8String;
begin
  Result := false;

  if (Direct) then
  begin
    SelfPath := Self.GetParent().GetAbsolutePath().AppendPathDelim().ToUTF8();
    ParentPath := Parent.GetAbsolutePath().AppendPathDelim().ToUTF8();

    // simply check if this paths parent path (SelfPath) equals ParentPath
    Result := (SelfPath = ParentPath);
  end
  else
  begin
    SelfPath := Self.GetAbsolutePath().AppendPathDelim().ToUTF8();
    ParentPath := Parent.GetAbsolutePath().AppendPathDelim().ToUTF8();

    if (Length(SelfPath) <= Length(ParentPath)) then
      Exit;

    // check if ParentPath is a substring of SelfPath
    if (FileSystem.IsCaseSensitive()) then
      Result := (StrLComp(PAnsiChar(SelfPath), PAnsiChar(ParentPath), Length(ParentPath)) = 0)
    else
      Result := (StrLIComp(PAnsiChar(SelfPath), PAnsiChar(ParentPath), Length(ParentPath)) = 0)
  end;
end;

function AdjustCaseRecursive(CurPath: IPath; AdjustAllLevels: boolean): IPath;
var
  OldParent, AdjustedParent: IPath;
  LocalName: IPath;
  PathFound: IPath;
  PathWithAdjParent: IPath;
  SearchInfo: TFileInfo;
  FileIter: IFileIterator;
  Pattern: IPath;
begin
  // if case-sensitive path exists there is no need to adjust case
  if (CurPath.Exists()) then
  begin
    Result := CurPath;
    Exit;
  end;

  LocalName := CurPath.RemovePathDelim().GetName();

  // try to adjust parent
  OldParent := CurPath.GetParent();
  if (OldParent <> PATH_NONE) then
  begin
    if (not AdjustAllLevels) then
    begin
      AdjustedParent := OldParent;
    end
    else
    begin
      AdjustedParent := AdjustCaseRecursive(OldParent, AdjustAllLevels);
      if (AdjustedParent = nil) then
      begin
        // parent path was not found case-insensitive
        Result := nil;
        Exit;
      end;

      // check if the path with adjusted parent can be found now
      PathWithAdjParent := AdjustedParent.Append(LocalName);
      if (PathWithAdjParent.Exists()) then
      begin
        Result := PathWithAdjParent;
        Exit;
      end;
    end;
    Pattern := AdjustedParent.Append(Path('*'));
  end
  else // path has no parent
  begin
    // the top path can either be absolute or relative
    if (CurPath.IsAbsolute) then
    begin
      // the only absolute directory at Unix without a parent is root ('/')
      // and hence does not need to be adjusted
      Result := CurPath;
      Exit;
    end;
    // this is a relative path, search in the current working dir
    AdjustedParent := nil;
    Pattern := Path('*');
  end;

  // compare name with all files in the current directory case-insensitive
  FileIter := FileSystem.FileFind(Pattern, faAnyFile);
  while (FileIter.HasNext()) do
  begin
    SearchInfo := FileIter.Next();
    PathFound := SearchInfo.Name;
    if (CompareText(LocalName.ToUTF8, PathFound.ToUTF8) = 0) then
    begin
      if (AdjustedParent <> nil) then
        Result := AdjustedParent.Append(PathFound)
      else
        Result := PathFound;
      Exit;
    end;
  end;

  // no matching file found
  Result := nil;
end;

function TPathImpl.AdjustCase(AdjustAllLevels: boolean): IPath;
begin
  AssertRefCount;

  Result := Self;

  if (FileSystem.IsCaseSensitive) then
  begin
    Result := AdjustCaseRecursive(Self, AdjustAllLevels);
    if (Result = nil) then
      Result := Self;
  end;
end;

function TPathImpl.AppendPathDelim(): IPath;
begin
  AssertRefCount;
  Result := FileSystem.IncludeTrailingPathDelimiter(Self);
end;

function TPathImpl.RemovePathDelim(): IPath;
begin
  AssertRefCount;
  Result := FileSystem.ExcludeTrailingPathDelimiter(Self);
end;

function TPathImpl.CreateFile(): THandle;
begin
  Result := FileSystem.FileCreate(Self);
end;

function TPathImpl.CreateDirectory(Force: boolean): boolean;
begin
  if (Force) then
    Result := FileSystem.ForceDirectories(Self)
  else
    Result := FileSystem.DirectoryCreate(Self);
end;

function TPathImpl.Open(Mode: longword): THandle;
begin
  Result := FileSystem.FileOpen(Self, Mode);
end;

function TPathImpl.GetFileAge(): integer;
begin
  Result := FileSystem.FileAge(Self);
end;

function TPathImpl.GetFileAge(out FileDateTime: TDateTime): boolean;
begin
  Result := FileSystem.FileAge(Self, FileDateTime);
end;

function TPathImpl.Exists(): boolean;
begin
  // note the different specifications of FileExists() on Win32 <> Unix
  {$IFDEF MSWINDOWS}
  Result := IsFile() or IsDirectory();
  {$ELSE}
  Result := FileSystem.FileExists(Self);
  {$ENDIF}
end;

function TPathImpl.IsFile(): boolean;
begin
  // note the different specifications of FileExists() on Win32 <> Unix
  {$IFDEF MSWINDOWS}
  Result := FileSystem.FileExists(Self);
  {$ELSE}
  Result := Exists() and not IsDirectory();
  {$ENDIF}
end;

function TPathImpl.IsDirectory(): boolean;
begin
  Result := FileSystem.DirectoryExists(Self);
end;

function TPathImpl.IsAbsolute(): boolean;
begin
  AssertRefCount;
  Result := FileSystem.FileIsReadOnly(Self);
end;

function TPathImpl.GetAttr(): cardinal;
begin
  Result := FileSystem.FileGetAttr(Self);
end;

function TPathImpl.SetAttr(Attr: Integer): boolean;
begin
  Result := FileSystem.FileSetAttr(Self, Attr);
end;

function TPathImpl.IsReadOnly(): boolean;
begin
  Result := FileSystem.FileIsReadOnly(Self);
end;

function TPathImpl.SetReadOnly(ReadOnly: boolean): boolean;
begin
  Result := FileSystem.FileSetReadOnly(Self, ReadOnly);
end;

function TPathImpl.IsUnset(): boolean;
begin
  Result := (fName = '');
end;

function TPathImpl.IsSet(): boolean;
begin
  Result := (fName <> '');
end;

function TPathImpl.FileSearch(const DirList: IPath): IPath;
begin
  AssertRefCount;
  Result := FileSystem.FileSearch(Self, DirList);
end;

function TPathImpl.Rename(const NewName: IPath): boolean;
begin
  Result := FileSystem.RenameFile(Self, NewName);
end;

function TPathImpl.DeleteFile(): boolean;
begin
  Result := FileSystem.DeleteFile(Self);
end;

function TPathImpl.DeleteEmptyDir(): boolean;
begin
  Result := FileSystem.RemoveDir(Self);
end;

function TPathImpl.CopyFile(const Target: IPath; FailIfExists: boolean): boolean;
begin
  Result := FileSystem.CopyFile(Self, Target, FailIfExists);
end;

function TPathImpl.GetIntern(): UTF8String;
begin
  Result := fName;
end;


{ TBinaryFileStream }

constructor TBinaryFileStream.Create(const FileName: IPath; Mode: word);
begin
{$IFDEF MSWINDOWS}
  inherited Create(FileName.ToWide(), Mode);
{$ELSE}
  inherited Create(FileName.ToNative(), Mode);
{$ENDIF}
end;

{ TTextStream }

constructor TTextFileStream.Create(Filename: IPath; Mode: word);
begin
  inherited Create();
  fMode := Mode;
  fFilename := Filename;
  fLineBreak := sLineBreak;
end;

function TTextFileStream.ReadLine(var Line: UTF8String): boolean;
begin
  Line := ReadLine(Result);
end;

function TTextFileStream.ReadLine(var Line: AnsiString): boolean;
begin
  Line := ReadLine(Result);
end;

procedure TTextFileStream.WriteString(const Str: RawByteString);
begin
  WriteBuffer(Str[1], Length(Str));
end;

procedure TTextFileStream.WriteLine(const Line: RawByteString);
begin
  WriteBuffer(Line[1], Length(Line));
  WriteBuffer(fLineBreak[1], Length(fLineBreak));
end;

{ TMemTextStream }

constructor TMemTextFileStream.Create(Filename: IPath; Mode: word);
var
  FileStream: TBinaryFileStream;
begin
  inherited Create(Filename, Mode);

  fStream := TMemoryStream.Create();

  // load data to memory in read mode
  if ((Mode and 3) in [fmOpenRead, fmOpenReadWrite]) then
  begin
    FileStream := TBinaryFileStream.Create(Filename, fmOpenRead);
    try
      fStream.LoadFromStream(FileStream);
    finally
      FileStream.Free;
    end;
  end
  // check if file exists for write-mode
  else if ((Mode and 3) = fmOpenWrite) and (not Filename.IsFile) then
  begin
    raise EFOpenError.CreateResFmt(@SFOpenError,
          [FileName.GetAbsolutePath.ToNative]);
  end;
end;

destructor TMemTextFileStream.Destroy();
var
  FileStream: TBinaryFileStream;
  SaveMode: word;
begin
  // save changes in write mode (= not read-only mode)
  if ((fMode and 3) <> fmOpenRead) then
  begin
    if (fMode = fmCreate) then
      SaveMode := fmCreate
    else
      SaveMode := fmOpenWrite;
    FileStream := TBinaryFileStream.Create(fFilename, SaveMode);
    try
      fStream.SaveToStream(FileStream);
    finally
      FileStream.Free;
    end;
  end;

  fStream.Free;
  inherited;
end;

function TMemTextFileStream.GetSize: int64;
begin
  Result := fStream.Size;
end;

function TMemTextFileStream.Read(var Buffer; Count: longint): longint;
begin
  Result := fStream.Read(Buffer, Count);
end;

function TMemTextFileStream.Write(const Buffer; Count: longint): longint;
begin
  Result := fStream.Write(Buffer, Count);
end;

function TMemTextFileStream.Seek(Offset: longint; Origin: word): longint;
begin
  Result := fStream.Seek(Offset, Origin);
end;

function TMemTextFileStream.Seek(const Offset: int64; Origin: TSeekOrigin): int64;
begin
  Result := fStream.Seek(Offset, Origin);
end;

function TMemTextFileStream.CopyMemString(StartPos: int64; EndPos: int64): RawByteString;
var
  LineLength: cardinal;
  Temp: RawByteString;
begin
  LineLength := EndPos - StartPos;
  if (LineLength > 0) then
  begin
    // set string length to line-length (+ zero-terminator)
    SetLength(Temp, LineLength);
    StrLCopy(PAnsiChar(Temp),
             @PAnsiChar(fStream.Memory)[StartPos],
             LineLength);
    Result := Temp;
  end
  else
  begin
    Result := '';
  end;
end;

function TMemTextFileStream.ReadString(): RawByteString;
var
  TextPtr: PAnsiChar;
  CurPos, StartPos, FileSize: int64;
begin
  TextPtr := PAnsiChar(fStream.Memory);
  CurPos := Position;
  FileSize := Size;
  StartPos := -1;

  while (CurPos < FileSize) do
  begin
    // check for whitespace (tab, lf, cr, space)
    if (TextPtr[CurPos] in [#9, #10, #13, ' ']) then
    begin
      // check if we are at the end of a string
      if (StartPos > -1) then
        Break;
    end
    else if (StartPos = -1) then // start of string found
    begin
      StartPos := CurPos;
    end;
    Inc(CurPos);
  end;

  if (StartPos = -1) then
    Result := ''
  else
  begin
    Result := CopyMemString(StartPos, CurPos);
    fStream.Position := CurPos;
  end;
end;

{*
 * Implementation of ReadLine(). We need separate versions for UTF8String
 * and AnsiString as "var" parameter types have to fit exactly.
 * To avoid a var-parameter here, the internal version the Line parameter is
 * used as return value.
 *}
function TMemTextFileStream.ReadLine(var Success: boolean): RawByteString;
var
  TextPtr: PAnsiChar;
  CurPos, FileSize: int64;
begin
  TextPtr := PAnsiChar(fStream.Memory);
  CurPos := fStream.Position;
  FileSize := Size;

  // check for EOF
  if (CurPos >= FileSize) then
  begin
    Result := '';
    Success := false;
    Exit;
  end;

  Success := true;

  while (CurPos < FileSize) do
  begin
    if (TextPtr[CurPos] in [#10, #13]) then
    begin
      // copy text line
      Result := CopyMemString(fStream.Position, CurPos);

      // handle windows style #13#10 (\r\n) newlines
      if (TextPtr[CurPos] = #13) and
         (CurPos+1 < FileSize) and
         (TextPtr[CurPos+1] = #10) then
      begin
        Inc(CurPos);
      end;

      // update stream pos
      fStream.Position := CurPos+1;

      Exit;
    end;
    Inc(CurPos);
  end;

  Result := CopyMemString(fStream.Position, CurPos);
  fStream.Position := FileSize;
end;

{ TUnicodeMemoryStream }

procedure TUnicodeMemoryStream.LoadFromFile(const FileName: IPath);
var
  Stream: TStream;
begin
  Stream := TBinaryFileStream.Create(FileName, fmOpenRead or fmShareDenyWrite);
  try
    LoadFromStream(Stream);
  finally
    Stream.Free;
  end;
end;

procedure TUnicodeMemoryStream.SaveToFile(const FileName: IPath);
var
  Stream: TStream;
begin
  Stream := TBinaryFileStream.Create(FileName, fmCreate);
  try
    SaveToStream(Stream);
  finally
    Stream.Free;
  end;
end;

{ TUnicodeMemIniFile }

constructor TUnicodeMemIniFile.Create(const FileName: IPath; UTF8Encoded: boolean);
var
  List: TStringList;
  Stream: TBinaryFileStream;
  BOMBuf: array[0..2] of AnsiChar;
begin
  inherited Create('');
  FFilename := FileName;
  FUTF8Encoded := UTF8Encoded;

  if FileName.Exists() then
  begin
    List := nil;
    Stream := nil;
    try
      List := TStringList.Create;
      Stream := TBinaryFileStream.Create(FileName, fmOpenRead);
      if (Stream.Read(BOMBuf[0], SizeOf(BOMBuf)) = 3) and
         (CompareMem(PChar(UTF8_BOM), @BomBuf, Length(UTF8_BOM))) then
      begin
        // truncate BOM
        FUTF8Encoded := true;
      end
      else
      begin
        // rewind file
        Stream.Seek(0, soBeginning);
      end;
      List.LoadFromStream(Stream);
      SetStrings(List);
    finally
      Stream.Free;
      List.Free;
    end;
  end;
end;

procedure TUnicodeMemIniFile.UpdateFile;
var
  List: TStringList;
  Stream: TBinaryFileStream;
begin
  List := nil;
  Stream := nil;
  try
    List := TStringList.Create;
    GetStrings(List);
    Stream := TBinaryFileStream.Create(FFileName, fmCreate);
    if UTF8Encoded then
      Stream.Write(UTF8_BOM, Length(UTF8_BOM));
    List.SaveToStream(Stream);
  finally
    List.Free;
    Stream.Free;
  end;
end;


var
  PATH_NONE_Singelton: IPath;

function PATH_NONE(): IPath;
begin
  Result := PATH_NONE_Singelton;
end;

initialization
  {$IFDEF HAVE_REFCNTBUG}
  GarbageList := TInterfaceList.Create();
  GarbageList.Capacity := GarbageMaxCount;
  {$ENDIF}
  PATH_NONE_Singelton := Path('');

finalization
  PATH_NONE_Singelton := nil;

end.