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