1 files changed, 165 insertions, 0 deletions
diff --git a/src/Classes/UPlatform.pas b/src/Classes/UPlatform.pas
new file mode 100644
index 00000000..b71ac1b8
--- /dev/null
+++ b/src/Classes/UPlatform.pas
@@ -0,0 +1,165 @@
+unit UPlatform;
+
+// Comment by Eddie:
+// This unit defines an interface for platform specific utility functions.
+// The Interface is implemented in separate files for each platform:
+// UPlatformWindows, UPlatformLinux and UPlatformMacOSX.
+
+interface
+
+{$IFDEF FPC}
+  {$MODE Delphi}
+{$ENDIF}
+
+{$I switches.inc}
+
+uses Classes;
+
+type
+  TDirectoryEntry = record
+    Name        : WideString;
+    IsDirectory : boolean;
+    IsFile      : boolean;
+  end;
+
+  TDirectoryEntryArray = array of TDirectoryEntry;
+
+  TPlatform = class
+    procedure Init; virtual;
+    function DirectoryFindFiles(Dir, Filter: WideString; ReturnAllSubDirs: boolean): TDirectoryEntryArray; virtual; abstract;
+    function TerminateIfAlreadyRunning(var WndTitle : string): boolean; virtual;
+    function FindSongFile(Dir, Mask: WideString): WideString; virtual;
+    procedure Halt; virtual;
+    function GetLogPath        : WideString; virtual; abstract;
+    function GetGameSharedPath : WideString; virtual; abstract;
+    function GetGameUserPath   : WideString; virtual; abstract;
+    function CopyFile(const Source, Target: WideString; FailIfExists: boolean): boolean; virtual;
+  end;
+
+  function Platform(): TPlatform;
+
+implementation
+
+uses
+  SysUtils,
+  {$IFDEF MSWINDOWS}
+  UPlatformWindows,
+  {$ENDIF}
+  {$IFDEF LINUX}
+  UPlatformLinux,
+  {$ENDIF}
+  {$IFDEF DARWIN}
+  UPlatformMacOSX,
+  {$ENDIF}
+  ULog;
+
+
+// I have modified it to use the Platform_singleton in this location ( in the implementaiton )
+// so that this variable can NOT be overwritten from anywhere else in the application.
+// the accessor function platform, emulates all previous calls to work the same way.  
+var
+  Platform_singleton : TPlatform;
+
+function Platform : TPlatform;
+begin
+  Result := Platform_singleton;
+end;
+
+(**
+ * Default Init() implementation
+ *)
+procedure TPlatform.Init;
+begin
+end;
+
+(**
+ * Default Halt() implementation
+ *)
+procedure TPlatform.Halt;
+begin
+  // Note: Application.terminate is NOT the same
+  System.Halt;
+end;
+
+(**
+ * Default TerminateIfAlreadyRunning() implementation
+ *)
+function TPlatform.TerminateIfAlreadyRunning(var WndTitle : string): Boolean;
+begin
+  Result := false;
+end;
+
+(**
+ * Default FindSongFile() implementation
+ *)
+function TPlatform.FindSongFile(Dir, Mask: WideString): WideString;
+var
+  SR: TSearchRec;   // for parsing song directory
+begin
+  Result := '';
+  if SysUtils.FindFirst(Dir + Mask, faDirectory, SR) = 0 then
+  begin
+    Result := SR.Name;
+  end;
+  SysUtils.FindClose(SR);
+end;
+
+function TPlatform.CopyFile(const Source, Target: WideString; 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, fmOpenRead);
+      TargetFile := TFileStream.Create(Target, 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;
+
+
+initialization
+{$IFDEF MSWINDOWS}
+  Platform_singleton := TPlatformWindows.Create;
+{$ENDIF}
+{$IFDEF LINUX}
+  Platform_singleton := TPlatformLinux.Create;
+{$ENDIF}
+{$IFDEF DARWIN}
+  Platform_singleton := TPlatformMacOSX.Create;
+{$ENDIF}
+
+finalization
+  Platform_singleton.Free;
+
+end.