TPlatform.CopyFile added

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/trunk@1281 b956fd51-792f-4845-bead-9b4dfca2ff2c

1 files changed, 54 insertions, 9 deletions

diff --git a/Game/Code/Classes/UPlatform.pas b/Game/Code/Classes/UPlatform.pas
index 5d197937..b71ac1b8 100644
--- a/Game/Code/Classes/UPlatform.pas
+++ b/Game/Code/Classes/UPlatform.pas
@@ -26,13 +26,14 @@ type
 
   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;
+    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 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;
@@ -42,14 +43,15 @@ implementation
 uses
   SysUtils,
   {$IFDEF MSWINDOWS}
-  UPlatformWindows;
+  UPlatformWindows,
   {$ENDIF}
   {$IFDEF LINUX}
-  UPlatformLinux;
+  UPlatformLinux,
   {$ENDIF}
   {$IFDEF DARWIN}
-  UPlatformMacOSX;
+  UPlatformMacOSX,
   {$ENDIF}
+  ULog;
 
 
 // I have modified it to use the Platform_singleton in this location ( in the implementaiton )
@@ -102,6 +104,49 @@ begin
   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}