anchor.diff:  
       3: // list of topics containing word
       begin
  +      ClearUInt32Array( Results, _TopicCount );
         while pData < pDataEnd do
         begin
           TopicIndex:= pUInt16( pData )^;
  
positive.code:     end;
  
      5, // compressed by truncating bit stream at last byte containing a set bit.
      6: // same as above but starting at non-zero byte
      begin
        if CompressionCode = 5 then
          TopicIndex:= 0
        else
        begin
          TopicIndex:= pUInt16( pData )^ * 8;
  
negative.code:         inc( pData );
        end;
      end;
  
      else  { unmatched case items }
      begin
  //      writeln('Unknown search method: Found no topic text match');
        // unknown method
        ClearUInt32Array( Results, _TopicCount );
      end;
    end;
  end;
  
  