CentrED/Client/UResourceManager.pas

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(*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at
* http://www.opensource.org/licenses/cddl1.php.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at
* http://www.opensource.org/licenses/cddl1.php. If applicable,
* add the following below this CDDL HEADER, with the fields enclosed
* by brackets "[]" replaced with your own identifying * information:
* Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
*
* Portions Copyright 2007 Andreas Schneider
*)
unit UResourceManager;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils;
type
{ TResourceManager }
TResourceManager = class(TObject)
constructor Create(AFileName: string);
destructor Destroy; override;
protected
FFileStream: TFileStream;
FCount: Integer;
FLookupTable: array of Cardinal;
FCurrentResource: Integer;
FResourceStream: TMemoryStream;
public
function GetResource(AIndex: Integer): TStream;
end;
var
ResourceManager: TResourceManager;
implementation
{ TResourceManager }
constructor TResourceManager.Create(AFileName: string);
begin
inherited Create;
FFileStream := TFileStream.Create(AFileName, fmOpenRead or fmShareDenyWrite);
FFileStream.Position := 0;
FFileStream.Read(FCount, SizeOf(Integer));
SetLength(FLookupTable, FCount);
FFileStream.Read(FLookupTable[0], FCount * SizeOf(Cardinal));
FCurrentResource := -1;
end;
destructor TResourceManager.Destroy;
begin
if FFileStream <> nil then FreeAndNil(FFileStream);
if FResourceStream <> nil then FreeAndNil(FResourceStream);
inherited Destroy;
end;
function TResourceManager.GetResource(AIndex: Integer): TStream;
var
size: Cardinal;
begin
if AIndex <> FCurrentResource then
begin
FFileStream.Position := FLookupTable[AIndex];
if FResourceStream <> nil then
FResourceStream.Free;
FResourceStream := TMemoryStream.Create;
FFileStream.Read(size, SizeOf(Cardinal));
FResourceStream.CopyFrom(FFileStream, size);
FCurrentResource := AIndex;
end;
FResourceStream.Position := 0;
Result := FResourceStream;
end;
initialization
begin
ResourceManager := TResourceManager.Create(ChangeFileExt(ParamStr(0), '.dat'));
end;
finalization
begin
if ResourceManager <> nil then FreeAndNil(ResourceManager);
end;
end.