aboutsummaryrefslogtreecommitdiffstats
path: root/src/base/UFilesystem.pas
blob: 4fd91048dd0d3b7d6e9dc9b86a49491c79faddba (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
{* 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 UFilesystem;

interface

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

{$I switches.inc}

uses
  SysUtils,
  Classes,
  {$IFDEF MSWINDOWS}
  Windows,
  TntSysUtils,
  {$ENDIF}
  UPath;

type
  TSytemSearchRec = TSearchRec;

  TFileInfo = record
    Time: integer;  // timestamp
    Size: int64;    // file size (byte)
    Attr: integer;  // file attributes
    Name: IPath;    // basename with extension
  end;

  {**
   * Iterates through the search results retrieved by FileFind().
   * Example usage:
   *   while(Iter.HasNext()) do
   *     SearchRec := Iter.Next();
   *}
  IFileIterator = interface
    function HasNext(): boolean;
    function Next(): TFileInfo;
  end;

  {**
   * Wrapper for SysUtils file functions.
   * For documentation and examples, check the SysUtils equivalent.
   *}
  IFileSystem = interface
    function ExpandFileName(const FileName: IPath): IPath;
    function FileCreate(const FileName: IPath): TFileHandle;
    function DirectoryCreate(const Dir: IPath): boolean;
    function FileOpen(const FileName: IPath; Mode: longword): TFileHandle;
    function FileAge(const FileName: IPath): integer; overload;
    function FileAge(const FileName: IPath; out FileDateTime: TDateTime): boolean; overload;

    function DirectoryExists(const Name: IPath): boolean;

    {**
     * On Windows: returns true only for files (not directories)
     * On Apple/Unix: returns true for all kind of files (even directories)
     * @seealso SysUtils.FileExists()
     *}
    function FileExists(const Name: IPath): boolean;

    function FileGetAttr(const FileName: IPath): Cardinal;
    function FileSetAttr(const FileName: IPath; Attr: integer): boolean;
    function FileIsReadOnly(const FileName: IPath): boolean;
    function FileSetReadOnly(const FileName: IPath; ReadOnly: boolean): boolean;
    function FileIsAbsolute(const FileName: IPath): boolean;
    function ForceDirectories(const Dir: IPath): boolean;
    function RenameFile(const OldName, NewName: IPath): boolean;
    function DeleteFile(const FileName: IPath): boolean;
    function RemoveDir(const Dir: IPath): boolean;

    {**
     * Copies file Source to Target. If FailIfExists is true, the file is not
     * copied if it already exists.
     * Returns true if the file was successfully copied.
     *}
    function CopyFile(const Source, Target: IPath; FailIfExists: boolean): boolean;

    function ExtractFileDrive(const FileName: IPath): IPath;
    function ExtractFilePath(const FileName: IPath): IPath;
    function ExtractFileDir(const FileName: IPath): IPath;
    function ExtractFileName(const FileName: IPath): IPath;
    function ExtractFileExt(const FileName: IPath): IPath;
    function ExtractRelativePath(const BaseName: IPath; const FileName: IPath): IPath;

    function ChangeFileExt(const FileName: IPath; const Extension: IPath): IPath;

    function IncludeTrailingPathDelimiter(const FileName: IPath): IPath;
    function ExcludeTrailingPathDelimiter(const FileName: IPath): IPath;

    {**
     * Searches for a file with filename Name in the directories given in DirList.
     *}
    function FileSearch(const Name: IPath; DirList: array of IPath): IPath;

    {**
     * More convenient version of FindFirst/Next/Close with iterator support.
     *}
    function FileFind(const FilePattern: IPath; Attr: integer): IFileIterator;

    {**
     * Old style search functions. Use FileFind() instead.
     *}
    function FindFirst(const FilePattern: IPath; Attr: integer; var F: TSytemSearchRec): integer;
    function FindNext(var F: TSytemSearchRec): integer;
    procedure FindClose(var F: TSytemSearchRec);

    function GetCurrentDir: IPath;
    function SetCurrentDir(const Dir: IPath): boolean;

    {**
     * Returns true if the filesystem is case-sensitive.
     *}
    function IsCaseSensitive(): boolean;
  end;

  function FileSystem(): IFileSystem;

implementation

type
  TFileSystemImpl = class(TInterfacedObject, IFileSystem)
  public
    function ExpandFileName(const FileName: IPath): IPath;
    function FileCreate(const FileName: IPath): TFileHandle;
    function DirectoryCreate(const Dir: IPath): boolean;
    function FileOpen(const FileName: IPath; Mode: longword): TFileHandle;
    function FileAge(const FileName: IPath): integer; overload;
    function FileAge(const FileName: IPath; out FileDateTime: TDateTime): boolean; overload;
    function DirectoryExists(const Name: IPath): boolean;
    function FileExists(const Name: IPath): boolean;
    function FileGetAttr(const FileName: IPath): Cardinal;
    function FileSetAttr(const FileName: IPath; Attr: integer): boolean;
    function FileIsReadOnly(const FileName: IPath): boolean;
    function FileSetReadOnly(const FileName: IPath; ReadOnly: boolean): boolean;
    function FileIsAbsolute(const FileName: IPath): boolean;
    function ForceDirectories(const Dir: IPath): boolean;
    function RenameFile(const OldName, NewName: IPath): boolean;
    function DeleteFile(const FileName: IPath): boolean;
    function RemoveDir(const Dir: IPath): boolean;
    function CopyFile(const Source, Target: IPath; FailIfExists: boolean): boolean;

    function ExtractFileDrive(const FileName: IPath): IPath;
    function ExtractFilePath(const FileName: IPath): IPath;
    function ExtractFileDir(const FileName: IPath): IPath;
    function ExtractFileName(const FileName: IPath): IPath;
    function ExtractFileExt(const FileName: IPath): IPath;
    function ExtractRelativePath(const BaseName: IPath; const FileName: IPath): IPath;
    function ChangeFileExt(const FileName: IPath; const Extension: IPath): IPath;
    function IncludeTrailingPathDelimiter(const FileName: IPath): IPath;
    function ExcludeTrailingPathDelimiter(const FileName: IPath): IPath;

    function FileSearch(const Name: IPath; DirList: array of IPath): IPath;
    function FileFind(const FilePattern: IPath; Attr: integer): IFileIterator;

    function FindFirst(const FilePattern: IPath; Attr: integer; var F: TSytemSearchRec): integer;
    function FindNext(var F: TSytemSearchRec): integer;
    procedure FindClose(var F: TSytemSearchRec);

    function GetCurrentDir: IPath;
    function SetCurrentDir(const Dir: IPath): boolean;

    function IsCaseSensitive(): boolean;
  end;

  TFileIterator = class(TInterfacedObject, IFileIterator)
  private
    fHasNext: boolean;
    fSearchRec: TSytemSearchRec;
  public
    constructor Create(const FilePattern: IPath; Attr: integer);
    destructor Destroy(); override;

    function HasNext(): boolean;
    function Next(): TFileInfo;
  end;


var
  FileSystem_Singleton: IFileSystem;

function FileSystem(): IFileSystem;
begin
  Result := FileSystem_Singleton;
end;

function TFileSystemImpl.FileFind(const FilePattern: IPath; Attr: integer): IFileIterator;
begin
  Result := TFileIterator.Create(FilePattern, Attr);
end;

function TFileSystemImpl.IsCaseSensitive(): boolean;
begin
  // Windows and Mac OS X do not have case sensitive file systems
  {$IF Defined(MSWINDOWS) or Defined(DARWIN)}
    Result := false;
  {$ELSE}
    Result := true;
  {$IFEND}
end;

function TFileSystemImpl.FileIsAbsolute(const FileName: IPath): boolean;
var
  NameStr: UTF8String;
begin
  Result := true;
  NameStr := FileName.ToUTF8();

  {$IFDEF MSWINDOWS}
    // check if drive is given 'C:...'
    if (FileName.GetDrive().ToUTF8 <> '') then
      Exit;
    // check if path starts with '\\'
    if (Length(NameStr) >= 2) and
       (NameStr[1] = PathDelim) and (NameStr[2] = PathDelim) then
      Exit;
  {$ELSE} // Unix based systems
    // check if root dir given '/...'
    if (Length(NameStr) >= 1) and (NameStr[1] = PathDelim) then
      Exit;
  {$ENDIF}

  Result := false;
end;

{$IFDEF MSWINDOWS}

function TFileSystemImpl.ExpandFileName(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExpandFileName(FileName.ToWide()));
end;

function TFileSystemImpl.FileCreate(const FileName: IPath): TFileHandle;
begin
  Result := SysUtils.FileCreate(FileName.ToWide());
end;

function TFileSystemImpl.DirectoryCreate(const Dir: IPath): boolean;
begin
  Result := SysUtils.CreateDir(Dir.ToWide());
end;

function TFileSystemImpl.FileOpen(const FileName: IPath; Mode: longword): TFileHandle;
begin
  Result := SysUtils.FileOpen(FileName.ToWide(), Mode);
end;

function TFileSystemImpl.FileAge(const FileName: IPath): integer;
begin
  Result := SysUtils.FileAge(FileName.ToWide());
end;

function TFileSystemImpl.FileAge(const FileName: IPath; out FileDateTime: TDateTime): boolean;
var
  FileDate: integer;
begin
  FileDate := SysUtils.FileAge(FileName.ToWide());
  Result := (FileDate <> -1);
  if (Result) then
    FileDateTime := FileDateToDateTime(FileDate);
end;

function TFileSystemImpl.DirectoryExists(const Name: IPath): boolean;
begin
  Result := SysUtils.DirectoryExists(Name.ToWide());
end;

function TFileSystemImpl.FileExists(const Name: IPath): boolean;
begin
  Result := SysUtils.FileExists(Name.ToWide());
end;

function TFileSystemImpl.FileGetAttr(const FileName: IPath): Cardinal;
begin
  Result := SysUtils.FileGetAttr(FileName.ToWide());
end;

function TFileSystemImpl.FileSetAttr(const FileName: IPath; Attr: integer): boolean;
begin
 Result := (SysUtils.FileSetAttr(FileName.ToWide(), Attr) = 0);
end;

function TFileSystemImpl.FileIsReadOnly(const FileName: IPath): boolean;
begin
  Result := SysUtils.FileIsReadOnly(FileName.ToWide());
end;

function TFileSystemImpl.FileSetReadOnly(const FileName: IPath; ReadOnly: boolean): boolean;
begin
  Result := (SysUtils.FileSetAttr(FileName.ToWide(), faReadOnly) = 0);
end;

function TFileSystemImpl.ForceDirectories(const Dir: IPath): boolean;
begin
  Result := SysUtils.ForceDirectories(Dir.ToWide());
end;

function TFileSystemImpl.FileSearch(const Name: IPath; DirList: array of IPath): IPath;
var
  I: integer;
  DirListStr: WideString;
begin
  DirListStr := '';
  for I := 0 to High(DirList) do
  begin
    if (I > 0) then
      DirListStr := DirListStr + PathSep;
    DirListStr := DirListStr + DirList[I].ToWide();
  end;
  Result := Path(SysUtils.FileSearch(Name.ToWide(), DirListStr));
end;

function TFileSystemImpl.RenameFile(const OldName, NewName: IPath): boolean;
begin
  Result := SysUtils.RenameFile(OldName.ToNative(), NewName.ToWide());
end;

function TFileSystemImpl.DeleteFile(const FileName: IPath): boolean;
begin
  Result := SysUtils.DeleteFile(FileName.ToWide());
end;

function TFileSystemImpl.RemoveDir(const Dir: IPath): boolean;
begin
  Result := SysUtils.RemoveDir(Dir.ToWide());
end;

function TFileSystemImpl.CopyFile(const Source, Target: IPath; FailIfExists: boolean): boolean;
const
  COPY_BUFFER_SIZE = 4096; // a good tradeoff between speed and memory consumption
var
  SourceFile, TargetFile: TFileStream;
  FileCopyBuffer: array [0..COPY_BUFFER_SIZE-1] of byte; // temporary copy-buffer.
  NumberOfBytes: integer; // number of bytes read from SourceFile
begin
  Result := false;
  SourceFile := nil;
  TargetFile := nil;

  // if overwrite is disabled return if the target file already exists
  if (FailIfExists and FileExists(Target)) then
    Exit;

  try
    try
      // open source and target file (might throw an exception on error)
      SourceFile := TFileStream.Create(Source.ToWide(), fmOpenRead);
      TargetFile := TFileStream.Create(Target.ToWide(), fmCreate or fmOpenWrite);

      while true do
      begin
        // read a block from the source file and check for errors or EOF
        NumberOfBytes := SourceFile.Read(FileCopyBuffer, SizeOf(FileCopyBuffer));
        if (NumberOfBytes <= 0) then
          Break;
        // write block to target file and check if everything was written
        if (TargetFile.Write(FileCopyBuffer, NumberOfBytes) <> NumberOfBytes) then
          Exit;
      end;
    except
      Exit;
    end;
  finally
    SourceFile.Free;
    TargetFile.Free;
  end;

  Result := true;
end;

function TFileSystemImpl.ExtractFileDrive(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExtractFileDrive(FileName.ToWide()));
end;

function TFileSystemImpl.ExtractFilePath(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExtractFilePath(FileName.ToWide()));
end;

function TFileSystemImpl.ExtractFileDir(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExtractFileDir(FileName.ToWide()));
end;

function TFileSystemImpl.ExtractFileName(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExtractFileName(FileName.ToWide()));
end;

function TFileSystemImpl.ExtractFileExt(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExtractFileExt(FileName.ToWide()));
end;

function TFileSystemImpl.ExtractRelativePath(const BaseName: IPath; const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExtractRelativePath(BaseName.ToWide(), FileName.ToWide()));
end;

function TFileSystemImpl.ChangeFileExt(const FileName: IPath; const Extension: IPath): IPath;
begin
  Result := Path(SysUtils.ChangeFileExt(FileName.ToWide(), Extension.ToWide()));
end;

function TFileSystemImpl.IncludeTrailingPathDelimiter(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.IncludeTrailingPathDelimiter(FileName.ToWide()));
end;

function TFileSystemImpl.ExcludeTrailingPathDelimiter(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExcludeTrailingPathDelimiter(FileName.ToWide()));
end;

function TFileSystemImpl.FindFirst(const FilePattern: IPath; Attr: integer; var F: TSytemSearchRec): integer;
begin
  Result := SysUtils.FindFirst(FilePattern.ToWide(), Attr, F);
end;

function TFileSystemImpl.FindNext(var F: TSytemSearchRec): integer;
begin
  Result := SysUtils.FindNext(F);;
end;

procedure TFileSystemImpl.FindClose(var F: TSytemSearchRec);
begin
  SysUtils.FindClose(F);
end;

function TFileSystemImpl.GetCurrentDir: IPath;
begin
  Result := Path(SysUtils.GetCurrentDir());
end;

function TFileSystemImpl.SetCurrentDir(const Dir: IPath): boolean;
begin
  Result := SysUtils.SetCurrentDir(Dir.ToWide());
end;

{$ELSE} // UNIX

function TFileSystemImpl.ExpandFileName(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExpandFileName(FileName.ToNative()));
end;

function TFileSystemImpl.FileCreate(const FileName: IPath): TFileHandle;
begin
  Result := SysUtils.FileCreate(FileName.ToNative());
end;

function TFileSystemImpl.DirectoryCreate(const Dir: IPath): boolean;
begin
  Result := SysUtils.CreateDir(Dir.ToNative());
end;

function TFileSystemImpl.FileOpen(const FileName: IPath; Mode: longword): TFileHandle;
begin
  Result := SysUtils.FileOpen(FileName.ToNative(), Mode);
end;

function TFileSystemImpl.FileAge(const FileName: IPath): integer;
begin
  Result := SysUtils.FileAge(FileName.ToNative());
end;

function TFileSystemImpl.FileAge(const FileName: IPath; out FileDateTime: TDateTime): boolean;
var
  FileDate: integer;
begin
  FileDate := SysUtils.FileAge(FileName.ToNative());
  Result := (FileDate <> -1);
  if (Result) then
    FileDateTime := FileDateToDateTime(FileDate);
end;

function TFileSystemImpl.DirectoryExists(const Name: IPath): boolean;
begin
  Result := SysUtils.DirectoryExists(Name.ToNative());
end;

function TFileSystemImpl.FileExists(const Name: IPath): boolean;
begin
  Result := SysUtils.FileExists(Name.ToNative());
end;

function TFileSystemImpl.FileGetAttr(const FileName: IPath): Cardinal;
begin
  Result := SysUtils.FileGetAttr(FileName.ToNative());
end;

function TFileSystemImpl.FileSetAttr(const FileName: IPath; Attr: integer): boolean;
begin
  Result := (SysUtils.FileSetAttr(FileName.ToNative(), Attr) = 0);
end;

function TFileSystemImpl.FileIsReadOnly(const FileName: IPath): boolean;
begin
  Result := SysUtils.FileIsReadOnly(FileName.ToNative());
end;

function TFileSystemImpl.FileSetReadOnly(const FileName: IPath; ReadOnly: boolean): boolean;
begin
  Result := (SysUtils.FileSetAttr(FileName.ToNative(), faReadOnly) = 0);
end;

function TFileSystemImpl.ForceDirectories(const Dir: IPath): boolean;
begin
  Result := SysUtils.ForceDirectories(Dir.ToNative());
end;

function TFileSystemImpl.FileSearch(const Name: IPath; DirList: array of IPath): IPath;
var
  I: integer;
  DirListStr: AnsiString;
begin
  DirListStr := '';
  for I := 0 to High(DirList) do
  begin
    if (I > 0) then
      DirListStr := DirListStr + PathSep;
    DirListStr := DirListStr + DirList[I].ToNative();
  end;
  Result := Path(SysUtils.FileSearch(Name.ToNative(), DirListStr));
end;

function TFileSystemImpl.RenameFile(const OldName, NewName: IPath): boolean;
begin
  Result := SysUtils.RenameFile(OldName.ToNative(), NewName.ToNative());
end;

function TFileSystemImpl.DeleteFile(const FileName: IPath): boolean;
begin
  Result := SysUtils.DeleteFile(FileName.ToNative());
end;

function TFileSystemImpl.RemoveDir(const Dir: IPath): boolean;
begin
  Result := SysUtils.RemoveDir(Dir.ToNative());
end;

function TFileSystemImpl.CopyFile(const Source, Target: IPath; FailIfExists: boolean): boolean;
const
  COPY_BUFFER_SIZE = 4096; // a good tradeoff between speed and memory consumption
var
  SourceFile, TargetFile: TFileStream;
  FileCopyBuffer: array [0..COPY_BUFFER_SIZE-1] of byte; // temporary copy-buffer.
  NumberOfBytes: integer; // number of bytes read from SourceFile
begin
  Result := false;
  SourceFile := nil;
  TargetFile := nil;

  // if overwrite is disabled return if the target file already exists
  if (FailIfExists and FileExists(Target)) then
    Exit;

  try
    try
      // open source and target file (might throw an exception on error)
      SourceFile := TFileStream.Create(Source.ToNative(), fmOpenRead);
      TargetFile := TFileStream.Create(Target.ToNative(), fmCreate or fmOpenWrite);

      while true do
      begin
        // read a block from the source file and check for errors or EOF
        NumberOfBytes := SourceFile.Read(FileCopyBuffer, SizeOf(FileCopyBuffer));
        if (NumberOfBytes <= 0) then
          Break;
        // write block to target file and check if everything was written
        if (TargetFile.Write(FileCopyBuffer, NumberOfBytes) <> NumberOfBytes) then
          Exit;
      end;
    except
      Exit;
    end;
  finally
    SourceFile.Free;
    TargetFile.Free;
  end;

  Result := true;
end;

function TFileSystemImpl.ExtractFileDrive(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExtractFileDrive(FileName.ToNative()));
end;

function TFileSystemImpl.ExtractFilePath(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExtractFilePath(FileName.ToNative()));
end;

function TFileSystemImpl.ExtractFileDir(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExtractFileDir(FileName.ToNative()));
end;

function TFileSystemImpl.ExtractFileName(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExtractFileName(FileName.ToNative()));
end;

function TFileSystemImpl.ExtractFileExt(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExtractFileExt(FileName.ToNative()));
end;

function TFileSystemImpl.ExtractRelativePath(const BaseName: IPath; const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExtractRelativePath(BaseName.ToNative(), FileName.ToNative()));
end;

function TFileSystemImpl.ChangeFileExt(const FileName: IPath; const Extension: IPath): IPath;
begin
  Result := Path(SysUtils.ChangeFileExt(FileName.ToNative(), Extension.ToNative()));
end;

function TFileSystemImpl.IncludeTrailingPathDelimiter(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.IncludeTrailingPathDelimiter(FileName.ToNative()));
end;

function TFileSystemImpl.ExcludeTrailingPathDelimiter(const FileName: IPath): IPath;
begin
  Result := Path(SysUtils.ExcludeTrailingPathDelimiter(FileName.ToNative()));
end;

function TFileSystemImpl.FindFirst(const FilePattern: IPath; Attr: integer; var F: TSytemSearchRec): integer;
begin
  Result := SysUtils.FindFirst(FilePattern.ToNative(), Attr, F);
end;

function TFileSystemImpl.FindNext(var F: TSytemSearchRec): integer;
begin
  Result := SysUtils.FindNext(F);
end;

procedure TFileSystemImpl.FindClose(var F: TSytemSearchRec);
begin
  SysUtils.FindClose(F);
end;

function TFileSystemImpl.GetCurrentDir: IPath;
begin
  Result := Path(SysUtils.GetCurrentDir());
end;

function TFileSystemImpl.SetCurrentDir(const Dir: IPath): boolean;
begin
  Result := SysUtils.SetCurrentDir(Dir.ToNative());
end;

{$ENDIF}


{ TFileIterator }

constructor TFileIterator.Create(const FilePattern: IPath; Attr: integer);
begin
  inherited Create();
  fHasNext := (FileSystem.FindFirst(FilePattern, Attr, fSearchRec) = 0);
end;

destructor TFileIterator.Destroy();
begin
  FileSystem.FindClose(fSearchRec);
  inherited;
end;

function TFileIterator.HasNext(): boolean;
begin
  Result := fHasNext;
end;

function TFileIterator.Next(): TFileInfo;
begin
  if (not fHasNext) then
  begin
    // Note: do not use FillChar() on records with ref-counted fields
    Result.Time := 0;
    Result.Size := 0;
    Result.Attr := 0;
    Result.Name := nil;
    Exit;
  end;

  Result.Time := fSearchRec.Time;
  Result.Size := fSearchRec.Size;
  Result.Attr := fSearchRec.Attr;
  Result.Name := Path(fSearchRec.Name);

  // fetch next entry
  fHasNext := (FileSystem.FindNext(fSearchRec) = 0);
end;


initialization
  FileSystem_Singleton := TFileSystemImpl.Create;

finalization
  FileSystem_Singleton := nil;

end.