UFilename.pas + UFilename.pas added for uniform filesystem access for Windows/Mac/Unix. Very experimental.

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/branches/experimental@1639 b956fd51-792f-4845-bead-9b4dfca2ff2c

2 files changed, 959 insertions, 0 deletions

diff --git a/unicode/src/base/UFilename.pas b/unicode/src/base/UFilename.pas
new file mode 100644
index 00000000..0cf12cc0
--- /dev/null
+++ b/unicode/src/base/UFilename.pas
@@ -0,0 +1,462 @@
+{* 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 UFilename;
+
+{$IFDEF FPC}
+  {$MODE Delphi}
+{$ENDIF}
+
+interface
+
+uses
+  {$IFDEF MSWINDOWS}
+  TntClasses,
+  {$ENDIF}
+  Classes;
+
+type
+  TPathEncoding = (
+    // pencLossless,
+    pencSystemUTF8,  // use system encoding. Mac: UTF8, Linux: None, Win: UTF8
+                     // Note:
+                     // - On windows, this format is lossless but is not
+                     //   supported direclty (UTF-16 only).
+                     // - This is the best format to store filenames as there is
+                     //   no dataloss.
+                     // - Do not use with glPrint() or other display functions
+                     //   as the resulting string is neither guaranteed to be
+                     //   UTF-8 nor ANSI.
+
+    pencSystemANSI,  // use system encoding. Mac: UTF8, Linux: None, Win: ANSI
+                     // Note:
+                     // - On windows, the ANSI format may break filenames
+                     //   that are not encoded in the active codepage.
+                     // - Use only if there is no equivalent WideString
+                     //   filesystem function.
+                     // - Do not use with glPrint() or other display functions
+                     //   as the resulting string is neither guaranteed to be
+                     //   UTF-8 nor ANSI.
+
+    // pencPrintable,
+    pencUTF8         // tries to present the filename as UTF-8 encoded string
+                     // that can be used for printing etc.
+                     // Note:
+                     // - Some characters whose encodings are unknown are
+                     //   represented either by '?' or as the representative of
+                     //   a different encoding. 
+                     // - On linux not all filenames can be represented
+                     //   correclty in UTF-8 as it does not have filename
+                     //   encodings (though most filenames are stored in UTF-8).
+                     // - Never use the result to store filenames or open files
+                     //   as the filenames may break due to conversion.
+  );
+
+  IPath = interface;
+
+  {$IFDEF MSWINDOWS}
+  TUniFileStream = class(TTntFileStream)
+  {$ELSE}
+  TUniFileStream = class(TFileStream)
+  {$ENDIF}
+  public
+    constructor Create(const FileName: IPath; Mode: Word);
+  end;
+
+  TUniMemoryStream = class(TMemoryStream)
+  public
+    procedure LoadFromFile(const FileName: IPath);
+    procedure SaveToFile(const FileName: IPath);
+  end;
+  
+  IPath = interface
+    function ToString(Encoding: TPathEncoding = pencSystemUTF8): AnsiString;
+    function ToWideString(): WideString;
+
+    function Adjust(): boolean;
+
+    function Expand(): IPath;
+    {** File must be closed with FileClose(Handle) after usage }
+    function CreateFile(): integer;                    
+    function CreateDir(): boolean;
+    {** File must be closed with FileClose(Handle) after usage }
+    function Open(Mode: LongWord): integer;
+    {** Stream must be freed with TUniFileStream.Free after usage }
+    function OpenStream(Mode: Word): TUniFileStream;
+    function GetFileAge(): integer; overload;
+    function GetFileAge(out FileDateTime: TDateTime): boolean; overload;
+    function Exists(): boolean;
+    function IsFile(): boolean;
+    function IsDirectory(): boolean;
+    function GetAttr(): cardinal;
+    function SetAttr(Attr: Integer): boolean;
+    function IsReadOnly(): boolean;
+    function SetReadOnly(ReadOnly: boolean): boolean;
+    function ForceDirectories(): boolean;              //-
+    function FileSearch(const DirList: IPath): IPath;  //-
+    function Rename(const NewName: IPath): boolean;
+    function DeleteFile(): boolean;
+    function DeleteEmptyDir(): boolean;
+    function CopyFile(const Target: IPath; FailIfExists: boolean): boolean;
+  end;
+
+function Path(const Name: AnsiString; Encoding: TPathEncoding = pencSystemANSI): IPath; overload;
+function Path(const Name: WideString): IPath; overload;
+function Path(PathComponents: array of const): IPath; overload;
+
+implementation
+
+uses
+  UFilesystem,
+  SysUtils;
+
+type
+  TPathImpl = class(TInterfacedObject, IPath)
+    private
+      fName: AnsiString;
+    public
+      constructor Create(const Name: string);
+      destructor Destroy(); override;
+
+      function ToString(Encoding: TPathEncoding = pencSystemANSI): AnsiString;
+      function ToWideString(): WideString;
+
+      //function Append(const IPath): IPath;
+      function Adjust(): boolean;
+      {**
+       * Removes trailing path-delimiter and replaces path-delimiters with '/'.
+       *}
+      procedure Unify();
+      function Expand(): IPath;
+
+      (*
+      function IncludeTrailingPathDelimiter(): IPath;
+      function ExcludeTrailingPathDelimiter(): IPath;
+      function ChangeFileExt(const Extension: IPath): IPath;
+      function ExtractFilePath(): IPath;
+      function ExtractFileDir(): IPath;
+      function ExtractFileDrive(): IPath;
+      function ExtractFileName(): IPath;
+      function ExtractFileExt(): IPath;
+      function ExtractRelativePath(const BaseName: IPath): IPath;
+      *)
+
+      function CreateFile(): integer;
+      function CreateDir(): boolean;
+      function Open(Mode: LongWord): integer;
+      function OpenStream(Mode: Word): TUniFileStream;
+      function GetFileAge(): integer; overload;
+      function GetFileAge(out FileDateTime: TDateTime): boolean; overload;
+      function Exists(): boolean;
+      function IsFile(): boolean;
+      function IsDirectory(): boolean;
+      function GetAttr(): cardinal;
+      function SetAttr(Attr: Integer): boolean;
+      function IsReadOnly(): boolean;
+      function SetReadOnly(ReadOnly: boolean): boolean;
+      function ForceDirectories(): boolean;
+      function FileSearch(const DirList: IPath): IPath;
+      function Rename(const NewName: IPath): boolean;
+      function DeleteFile(): boolean;
+      function DeleteEmptyDir(): boolean;
+      function CopyFile(const Target: IPath; FailIfExists: boolean): boolean;
+  end;
+
+  IPathIterator = interface
+    function Next(): IPath;
+  end;
+
+  TPathIteratorImpl = class(TInterfacedObject, IPathIterator)
+    private
+      fPath: IPath;
+      fPos: integer;
+    public
+      constructor Create(Path: IPath);
+      
+      function Next(): IPath;
+  end;
+
+function Path(const Name: AnsiString; Encoding: TPathEncoding): IPath;
+begin
+  {$IFDEF MSWINDOWS}
+  case Encoding of
+    pencUTF8:
+      // TODO: Check if UTF8
+      Result := TPathImpl.Create(Name);
+    pencSystemANSI:
+      Result := TPathImpl.Create(AnsiToUtf8(Name));
+    else
+      raise Exception.Create('Unhandled encoding');
+  end;
+  {$ELSE}
+  Result := TPathImpl.Create(Name);
+  {$ENDIF}
+end;
+
+function Path(const Name: WideString): IPath;
+begin
+  Result := TPathImpl.Create(UTF8Encode(Name));
+end;
+
+function Path(PathComponents: array of const): IPath;
+var
+  CompIndex: integer;
+  Name: string;
+begin
+  Name := '';
+  for CompIndex := 0 to High(PathComponents) do
+  begin
+    with PathComponents[CompIndex] do
+    begin
+      case (VType) of
+        vtString:
+          Name := Name + VString^;
+        vtAnsiString:
+          Name := Name + AnsiString(VAnsiString);
+        vtWideString:
+          Name := Name + UTF8Encode(WideString(VWideString));
+        vtObject:
+          raise Exception.Create('Unhandled Object type');
+        else
+          raise Exception.Create('Unhandled Path type');
+      end;
+    end;
+    Name := Name + PathDelim;
+  end;
+  Result := Path(Name);
+end;
+
+constructor TPathImpl.Create(const Name: string);
+begin
+  inherited Create();
+  fName := Name;
+  Unify();
+end;
+
+destructor TPathImpl.Destroy();
+begin
+  inherited;
+end;
+
+procedure TPathImpl.Unify();
+var
+  I: integer;
+begin
+  for I := 1 to Length(fName) do
+  begin
+    if (fName[I] in ['\', '/']) then
+      fName[I] := PathDelim;
+  end;
+  fName := ExcludeTrailingPathDelimiter(fName);
+end;
+
+function TPathImpl.ToString(Encoding: TPathEncoding): AnsiString;
+begin
+  {$IFDEF MSWINDOWS}
+  case Encoding of
+    pencUTF8:
+      Result := fName;
+    pencSystemANSI:
+      Result := Utf8ToAnsi(fName);
+    else
+      raise Exception.Create('Unhandled encoding');
+  end;
+  {$ELSE}
+  Result := fName;
+  {$ENDIF}
+end;
+
+function TPathImpl.ToWideString(): WideString;
+begin
+  Result := UTF8Decode(fName);
+end;
+
+function TPathImpl.Adjust(): boolean;
+begin
+  Result := false; //TODO
+end;
+
+
+
+function TPathImpl.Expand(): IPath;
+begin
+  Result := FileSystem.ExpandFileName(Self);
+end;
+
+function TPathImpl.CreateFile(): integer;
+begin
+  Result := FileSystem.FileCreate(Self);
+end;
+
+function TPathImpl.CreateDir(): boolean;
+begin
+  Result := FileSystem.DirectoryCreate(Self);
+end;
+
+function TPathImpl.Open(Mode: LongWord): integer;
+begin
+  Result := FileSystem.FileOpen(Self, Mode);
+end;
+
+function TPathImpl.OpenStream(Mode: Word): TUniFileStream;
+begin
+  Result := TUniFileStream.Create(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
+  Result := IsFile() or IsDirectory();
+end;
+
+function TPathImpl.IsFile(): boolean;
+begin
+  Result := FileSystem.FileExists(Self);
+end;
+
+function TPathImpl.IsDirectory(): boolean;
+begin
+  Result := FileSystem.DirectoryExists(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.ForceDirectories(): boolean;
+begin
+  Result := FileSystem.ForceDirectories(Self);
+end;
+
+function TPathImpl.FileSearch(const DirList: IPath): IPath;
+begin
+  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;
+
+
+
+{ TPathIteratorImpl }
+
+constructor TPathIteratorImpl.Create(Path: IPath);
+begin
+  fPath := Path;
+  fPos := -1;
+end;
+
+function TPathIteratorImpl.Next(): IPath;
+begin
+end;
+
+
+{ TUniFileStream }
+
+{$IFDEF MSWINDOWS}
+
+constructor TUniFileStream.Create(const FileName: IPath; Mode: Word);
+begin
+  inherited Create(FileName.ToWideString(), Mode);
+end;
+
+{$ELSE}
+
+constructor TUniFileStream.Create(const FileName: IPath; Mode: Word);
+begin
+  inherited Create(FileName.ToSystemString(), Mode);
+end;
+
+{$ENDIF}
+
+{ TUniMemoryStream }
+
+procedure TUniMemoryStream.LoadFromFile(const FileName: IPath);
+var
+  Stream: TStream;
+begin
+  Stream := TUniFileStream.Create(FileName, fmOpenRead or fmShareDenyWrite);
+  try
+    LoadFromStream(Stream);
+  finally
+    Stream.Free;
+  end;
+end;
+
+procedure TUniMemoryStream.SaveToFile(const FileName: IPath);
+var
+  Stream: TStream;
+begin
+  Stream := TUniFileStream.Create(FileName, fmCreate);
+  try
+    SaveToStream(Stream);
+  finally
+    Stream.Free;
+  end;
+end;
+
+end.
diff --git a/unicode/src/base/UFilesystem.pas b/unicode/src/base/UFilesystem.pas
new file mode 100644
index 00000000..b9020391
--- /dev/null
+++ b/unicode/src/base/UFilesystem.pas
@@ -0,0 +1,497 @@
+{* 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
+
+uses
+  {$IFDEF MSWINDOWS}
+  Windows,
+  TntSysUtils,
+  {$ENDIF}
+  UFilename,
+  SysUtils,
+  Classes;
+
+type
+  {$IFDEF MSWINDOWSe}
+  TSytemSearchRec = TSearchRecW;
+  {$ELSE}
+  TSytemSearchRec = TSearchRec;
+  {$ENDIF}
+
+  TUniSearchRec = record
+    Time: Integer;
+    Size: Int64;
+    Attr: Integer;
+    Name: IPath;
+    ExcludeAttr: Integer;
+    //FindHandle(): THandle;
+  end;
+
+  IFileFindIterator = interface
+    function HasNext(): Boolean;
+    function Next(): TUniSearchRec;
+  end;
+
+  IFileSystem = interface
+    function ExpandFileName(const FileName: IPath): IPath;
+    function FileCreate(const FileName: IPath): Integer;
+    function DirectoryCreate(const Dir: IPath): Boolean;
+    function FileOpen(const FileName: IPath; Mode: LongWord): Integer;
+    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 ForceDirectories(const Dir: IPath): Boolean;
+    function FileSearch(const Name: IPath; DirList: array of IPath): IPath;
+    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 FileFind(const FilePattern: IPath; Attr: Integer): IFileFindIterator;
+
+    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 CreateFileStream(const FileName: IPath; Mode: Word): THandleStream;
+  end;
+
+var
+  FileSystem: IFileSystem;
+
+implementation
+
+type
+  TFileSystemImpl = class(TInterfacedObject, IFileSystem)
+  public
+    function ExpandFileName(const FileName: IPath): IPath;
+    function FileCreate(const FileName: IPath): Integer;
+    function DirectoryCreate(const Dir: IPath): Boolean;
+    function FileOpen(const FileName: IPath; Mode: LongWord): Integer;
+    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 ForceDirectories(const Dir: IPath): Boolean;
+    function FileSearch(const Name: IPath; DirList: array of IPath): IPath;
+    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 FileFind(const FilePattern: IPath; Attr: Integer): IFileFindIterator;
+
+    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 CreateFileStream(const FileName: IPath; Mode: Word): THandleStream;
+  end;
+
+  TFileFindIterator = class(TInterfacedObject, IFileFindIterator)
+  private
+    fHasNext: Boolean;
+    fSearchRec: TSytemSearchRec;
+  public
+    constructor Create(const FilePattern: IPath; Attr: Integer);
+    destructor Destroy(); override;
+
+    function HasNext(): Boolean;
+    function Next(): TUniSearchRec;
+  end;
+
+
+function TFileSystemImpl.CreateFileStream(const FileName: IPath; Mode: Word): THandleStream;
+begin
+  Result := TUniFileStream.Create(FileName, Mode);
+end;
+
+function TFileSystemImpl.FileFind(const FilePattern: IPath; Attr: Integer): IFileFindIterator;
+begin
+  Result := TFileFindIterator.Create(FilePattern, Attr);
+end;
+
+{$IFDEF MSWINDOWSs}
+
+function TFileSystemImpl.ExpandFileName(const FileName: IPath): IPath;
+begin
+  Result := Path(WideExpandFileName(FileName.ToWideString()));
+end;
+
+function TFileSystemImpl.FileCreate(const FileName: IPath): Integer;
+begin
+  Result := WideFileCreate(FileName.ToWideString());
+end;
+
+function TFileSystemImpl.DirectoryCreate(const Dir: IPath): Boolean;
+begin
+  Result := WideCreateDir(Dir.ToWideString());
+end;
+
+function TFileSystemImpl.FileOpen(const FileName: IPath; Mode: LongWord): Integer;
+begin
+  Result := WideFileOpen(FileName.ToWideString(), Mode);
+end;
+
+function TFileSystemImpl.FileAge(const FileName: IPath): Integer;
+begin
+  Result := WideFileAge(FileName.ToWideString());
+end;
+
+function TFileSystemImpl.FileAge(const FileName: IPath; out FileDateTime: TDateTime): Boolean;
+begin
+  Result := WideFileAge(FileName.ToWideString(), FileDateTime);
+end;
+
+function TFileSystemImpl.DirectoryExists(const Name: IPath): Boolean;
+begin
+  Result := WideDirectoryExists(Name.ToWideString());
+end;
+
+function TFileSystemImpl.FileExists(const Name: IPath): Boolean;
+begin
+  Result := WideFileExists(Name.ToWideString());
+end;
+
+function TFileSystemImpl.FileGetAttr(const FileName: IPath): Cardinal;
+begin
+  Result := WideFileGetAttr(FileName.ToWideString());
+end;
+
+function TFileSystemImpl.FileSetAttr(const FileName: IPath; Attr: Integer): Boolean;
+begin
+  Result := WideFileSetAttr(FileName.ToWideString(), Attr);
+end;
+
+function TFileSystemImpl.FileIsReadOnly(const FileName: IPath): Boolean;
+begin
+  Result := WideFileIsReadOnly(FileName.ToWideString());
+end;
+
+function TFileSystemImpl.FileSetReadOnly(const FileName: IPath; ReadOnly: Boolean): Boolean;
+begin
+  Result := WideFileSetReadOnly(FileName.ToWideString(), ReadOnly);
+end;
+
+function TFileSystemImpl.ForceDirectories(const Dir: IPath): Boolean;
+begin
+  Result := WideForceDirectories(Dir.ToWideString());
+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].ToWideString();
+  end;
+  Result := Path(WideFileSearch(Name.ToWideString(), DirListStr));
+end;
+
+function TFileSystemImpl.RenameFile(const OldName, NewName: IPath): Boolean;
+begin
+  Result := WideRenameFile(OldName.ToWideString(), NewName.ToWideString());
+end;
+
+function TFileSystemImpl.DeleteFile(const FileName: IPath): Boolean;
+begin
+  Result := WideDeleteFile(FileName.ToWideString());
+end;
+
+function TFileSystemImpl.RemoveDir(const Dir: IPath): Boolean;
+begin
+  Result := WideRemoveDir(Dir.ToWideString());
+end;
+
+function TFileSystemImpl.CopyFile(const Source, Target: IPath; FailIfExists: Boolean): Boolean;
+begin
+  Result := WideCopyFile(Source.ToWideString(), Target.ToWideString(), FailIfExists);
+end;
+
+function TFileSystemImpl.FindFirst(const FilePattern: IPath; Attr: Integer; var F: TSytemSearchRec): Integer;
+begin
+  Result := WideFindFirst(FilePattern.ToWideString(), Attr, F);
+end;
+
+function TFileSystemImpl.FindNext(var F: TSytemSearchRec): Integer;
+begin
+  Result := WideFindNext(F);
+end;
+
+procedure TFileSystemImpl.FindClose(var F: TSytemSearchRec);
+begin
+  WideFindClose(F);
+end;
+
+function TFileSystemImpl.GetCurrentDir: IPath;
+begin
+  Result := Path(WideGetCurrentDir());
+end;
+
+function TFileSystemImpl.SetCurrentDir(const Dir: IPath): Boolean;
+begin
+  Result := WideSetCurrentDir(Dir.ToWideString());
+end;
+
+{$ELSE} // UNIX
+
+function TFileSystemImpl.ExpandFileName(const FileName: IPath): IPath;
+begin
+  Result := Path(SysUtils.ExpandFileName(FileName.ToString(pencSystemANSI)), pencSystemANSI);
+end;
+
+function TFileSystemImpl.FileCreate(const FileName: IPath): Integer;
+begin
+  Result := SysUtils.FileCreate(FileName.ToString(pencSystemANSI));
+end;
+
+function TFileSystemImpl.DirectoryCreate(const Dir: IPath): Boolean;
+begin
+  Result := SysUtils.CreateDir(Dir.ToString(pencSystemANSI));
+end;
+
+function TFileSystemImpl.FileOpen(const FileName: IPath; Mode: LongWord): Integer;
+begin
+  Result := SysUtils.FileOpen(FileName.ToString(pencSystemANSI), Mode);
+end;
+
+function TFileSystemImpl.FileAge(const FileName: IPath): Integer;
+begin
+  Result := SysUtils.FileAge(FileName.ToString(pencSystemANSI));
+end;
+
+function TFileSystemImpl.FileAge(const FileName: IPath; out FileDateTime: TDateTime): Boolean;
+begin
+  Result := SysUtils.FileAge(FileName.ToString(pencSystemANSI), FileDateTime);
+end;
+
+function TFileSystemImpl.DirectoryExists(const Name: IPath): Boolean;
+begin
+  Result := SysUtils.DirectoryExists(Name.ToString(pencSystemANSI));
+end;
+
+function TFileSystemImpl.FileExists(const Name: IPath): Boolean;
+begin
+  Result := SysUtils.FileExists(Name.ToString(pencSystemANSI));
+end;
+
+function TFileSystemImpl.FileGetAttr(const FileName: IPath): Cardinal;
+begin
+  Result := SysUtils.FileGetAttr(FileName.ToString(pencSystemANSI));
+end;
+
+function TFileSystemImpl.FileSetAttr(const FileName: IPath; Attr: Integer): Boolean;
+begin
+  Result := (SysUtils.FileSetAttr(FileName.ToString(pencSystemANSI), Attr) = 0);
+end;
+
+function TFileSystemImpl.FileIsReadOnly(const FileName: IPath): Boolean;
+begin
+  Result := SysUtils.FileIsReadOnly(FileName.ToString(pencSystemANSI));
+end;
+
+function TFileSystemImpl.FileSetReadOnly(const FileName: IPath; ReadOnly: Boolean): Boolean;
+begin
+  Result := SysUtils.FileSetReadOnly(FileName.ToString(pencSystemANSI), ReadOnly);
+end;
+
+function TFileSystemImpl.ForceDirectories(const Dir: IPath): Boolean;
+begin
+  Result := SysUtils.ForceDirectories(Dir.ToString(pencSystemANSI));
+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].ToString(pencSystemANSI);
+  end;
+  Result := Path(SysUtils.FileSearch(Name.ToString(pencSystemANSI), DirListStr), pencSystemANSI);
+end;
+
+function TFileSystemImpl.RenameFile(const OldName, NewName: IPath): Boolean;
+begin
+  Result := SysUtils.RenameFile(OldName.ToString(pencSystemANSI), NewName.ToString(pencSystemANSI));
+end;
+
+function TFileSystemImpl.DeleteFile(const FileName: IPath): Boolean;
+begin
+  Result := SysUtils.DeleteFile(FileName.ToString(pencSystemANSI));
+end;
+
+function TFileSystemImpl.RemoveDir(const Dir: IPath): Boolean;
+begin
+  Result := SysUtils.RemoveDir(Dir.ToString(pencSystemANSI));
+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.ToString(pencSystemANSI), fmOpenRead);
+      TargetFile := TFileStream.Create(Target.ToString(pencSystemANSI), 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.FindFirst(const FilePattern: IPath; Attr: Integer; var F: TSytemSearchRec): Integer;
+begin
+  Result := SysUtils.FindFirst(FilePattern.ToString(pencSystemANSI), 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(), pencSystemANSI);
+end;
+
+function TFileSystemImpl.SetCurrentDir(const Dir: IPath): Boolean;
+begin
+  Result := SysUtils.SetCurrentDir(Dir.ToString(pencSystemANSI));
+end;
+
+{$ENDIF}
+
+
+{ TFileFindIterator }
+
+constructor TFileFindIterator.Create(const FilePattern: IPath; Attr: Integer);
+begin
+  inherited Create();
+  fHasNext := (FileSystem.FindFirst(FilePattern, Attr, fSearchRec) = 0);
+end;
+
+destructor TFileFindIterator.Destroy();
+begin
+  FileSystem.FindClose(fSearchRec);
+  inherited;
+end;
+
+function TFileFindIterator.HasNext(): Boolean;
+begin
+  Result := fHasNext;
+end;
+
+function TFileFindIterator.Next(): TUniSearchRec;
+begin
+  if (not fHasNext) then
+  begin
+    FillChar(Result, SizeOf(Result), 0);
+    Exit;
+  end;
+
+  Result.Time := fSearchRec.Time;
+  Result.Size := fSearchRec.Size;
+  Result.Attr := fSearchRec.Attr;
+  {$IFDEF MSWINDOWS}
+  Result.Name := Path(fSearchRec.Name);
+  {$ELSE}
+  Result.Name := Path(fSearchRec.Name, pencSystem);
+  {$ENDIF}
+  Result.ExcludeAttr := fSearchRec.ExcludeAttr;
+
+  // fetch next entry
+  fHasNext := (FileSystem.FindNext(fSearchRec) = 0);
+end;
+
+
+initialization
+  FileSystem := TFileSystemImpl.Create;
+
+finalization
+  FileSystem := nil;
+
+end.