def get_cnams
      recl = 6

      begin
        cnams = (0..399).map do |i|
          File.binread(@bin_path, recl, @pos + recl * i).unpack("A*")[0]
        end
        @pos += recl * 400
        return cnams
      rescue => e
        raise
      end
    end
def get_cnams
      recl = 6

      begin
        cnams = (0..399).map do |i|
          File.binread(@bin_path, recl, @pos + recl * i).unpack("A*")[0]
        end
        @pos += recl * 400
        return cnams
      rescue => e
        raise
      end
    end
=========================================================================
 CNAM

 @param:  <none>
 @return: Array of CNAM
=========================================================================