# File lib/numru/nusdas.rb, line 51
    def get_sint4(str)
      if str.length == 4
        i = str.unpack("N")[0]
        return i > @@si4_max ? -1-(i^@@ui4_max) : i
      else
        len = str.length/4
        ary = Array.new(len)
        len.times{|n| ary[n] = get_sint4(str[n*4,4]) }
        return ary
      end
    end