104 lines
2.7 KiB
Plaintext
104 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 URadarProvider;
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{$mode objfpc}{$H+}
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interface
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uses
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SysUtils, Classes, UBufferedStreams;
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type
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TRadarProvider = class(TObject)
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constructor Create; overload; virtual;
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constructor Create(AData: TStream; AReadOnly: Boolean = False); overload; virtual;
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constructor Create(AData: string; AReadOnly: Boolean = False); overload; virtual;
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destructor Destroy; override;
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protected
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FData: TBufferedReader;
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FReadOnly: Boolean;
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public
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function GetColor(AID: Integer): Word;
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procedure SetColor(AID: Integer; AColor: Word);
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end;
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implementation
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{ TRaderProvider }
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constructor TRadarProvider.Create;
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begin
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inherited Create;
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end;
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constructor TRadarProvider.Create(AData: TStream; AReadOnly: Boolean);
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begin
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Create;
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FData := TBufferedReader.Create(AData, False);
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FReadOnly := AReadOnly;
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end;
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constructor TRadarProvider.Create(AData: string; AReadOnly: Boolean);
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var
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mode: Word;
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begin
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Create;
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if AReadOnly then
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mode := fmOpenRead or fmShareDenyWrite
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else
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mode := fmOpenReadWrite or fmShareDenyWrite;
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FData := TBufferedReader.Create(TFileStream.Create(AData, mode), True);
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FReadOnly := AReadOnly;
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end;
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destructor TRadarProvider.Destroy;
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begin
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if Assigned(FData) then FreeAndNil(FData);
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inherited Destroy;
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end;
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function TRadarProvider.GetColor(AID: Integer): Word;
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begin
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if (AID >= 0) and (AID < $10000) then
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begin
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FData.Position := SizeOf(Word) * AID;
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FData.Read(Result, SizeOf(Word));
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end else
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Result := 0;
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end;
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procedure TRadarProvider.SetColor(AID: Integer; AColor: Word);
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begin
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if (not FReadOnly) and (AID >= 0) and (AID < $10000) then
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begin
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FData.Position := SizeOf(Word) * AID;
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FData.Write(AColor, SizeOf(Word));
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end;
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end;
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end.
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