anchor.diff:    iwReadFromStream;
   end;
   {--------}
  -function TAbDfInputWindow.Position : longint;
  +function TAbDfInputWindow.Position : Int64;
   begin
     Result := (FCurrent - FStart) + FStartOffset;
   end;
  
positive.code:                           const aPrevMatch   : TAbDfMatch) : boolean;
        function GetNextChar : AnsiChar;
        function GetNextKeyLength : integer;
        function Position : longint;
        procedure ReadBuffer(var aBuffer; aCount  : longint;
                                          aOffset : Int64);
  
  
negative.code:       FOnProgress   : TAbProgressStep;
        FSlidePoint   : PAnsiChar;
        FStart        : PAnsiChar;
        FStartOffset  : Int64;
        FStream       : TStream;
        FStreamSize   : Int64;
        FUseCRC32     : boolean;
  