idstreamrandomaccess.pas

来自「网络控件适用于Delphi6」· PAS 代码 · 共 54 行

{ $HDR$}
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{ $Log:  88162: IdStreamRandomAccess.pas 
{
{   Rev 1.1    2004.05.20 1:40:30 PM  czhower
{ Last of the IdStream updates
}
unit IdStreamRandomAccess;

interface

uses
  IdStream;

type
  TIdStreamRandomAccess = class(TIdStream)
  protected
    function GetPosition: Integer; virtual; abstract;
    function GetSize: Integer; virtual; abstract;
    procedure SetPosition(const AValue: Integer); virtual; abstract;
  public
    function BOF: Boolean; virtual;
    function EOF: Boolean; virtual;
    procedure Skip(
      ASize: Integer
      ); virtual; abstract;
    //
    property Position: Integer read GetPosition write SetPosition;
    property Size: Integer read GetSize;
  end;

implementation

{ TIdStreamRandomAccess }

function TIdStreamRandomAccess.BOF: Boolean;
begin
  Result := Position = 0;
end;

function TIdStreamRandomAccess.EOF: Boolean;
begin
  Result := Position >= Size - 1;
end;

end.