create

# File lib/resolv.rb, line 1843
    def self.create(arg)
      case arg
      when IPv6
        return arg
      when String
        address = ''
        if Regex_8Hex =~ arg
          arg.scan(/[0-9A-Fa-f]+/) {|hex| address << [hex.hex].pack('n')}
        elsif Regex_CompressedHex =~ arg
          prefix = $1
          suffix = $2
          a1 = ''
          a2 = ''
          prefix.scan(/[0-9A-Fa-f]+/) {|hex| a1 << [hex.hex].pack('n')}
          suffix.scan(/[0-9A-Fa-f]+/) {|hex| a2 << [hex.hex].pack('n')}
          omitlen = 16 - a1.length - a2.length
          address << a1 << "\0" * omitlen << a2
        elsif Regex_6Hex4Dec =~ arg
          prefix, a, b, c, d = $1, $2.to_i, $3.to_i, $4.to_i, $5.to_i
          if (0..255) === a && (0..255) === b && (0..255) === c && (0..255) === d
            prefix.scan(/[0-9A-Fa-f]+/) {|hex| address << [hex.hex].pack('n')}
            address << [a, b, c, d].pack('CCCC')
          else
            raise ArgumentError.new("not numeric IPv6 address: " + arg)
          end
        elsif Regex_CompressedHex4Dec =~ arg
          prefix, suffix, a, b, c, d = $1, $2, $3.to_i, $4.to_i, $5.to_i, $6.to_i
          if (0..255) === a && (0..255) === b && (0..255) === c && (0..255) === d
            a1 = ''
            a2 = ''
            prefix.scan(/[0-9A-Fa-f]+/) {|hex| a1 << [hex.hex].pack('n')}
            suffix.scan(/[0-9A-Fa-f]+/) {|hex| a2 << [hex.hex].pack('n')}
            omitlen = 12 - a1.length - a2.length
            address << a1 << "\0" * omitlen << a2 << [a, b, c, d].pack('CCCC')
          else
            raise ArgumentError.new("not numeric IPv6 address: " + arg)
          end
        else
          raise ArgumentError.new("not numeric IPv6 address: " + arg)
        end
        return IPv6.new(address)
      else
        raise ArgumentError.new("cannot interpret as IPv6 address: #{arg.inspect}")
      end
    end