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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
function GetExecutionDir(): string;
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;
{**
* Returns the directory of the executable
*}
function TPlatform.GetExecutionDir(): string;
begin
Result := ExtractFilePath(ParamStr(0));
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.
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