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