parse227(resp) private

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# File lib/net/ftp.rb, line 879
    def parse227(resp)
      if resp[0, 3] != "227"
        raise FTPReplyError, resp
      end
      left = resp.index("(")
      right = resp.index(")")
      if left == nil or right == nil
        raise FTPProtoError, resp
      end
      numbers = resp[left + 1 .. right - 1].split(",")
      if numbers.length != 6
        raise FTPProtoError, resp
      end
      host = numbers[0, 4].join(".")
      port = (numbers[4].to_i << 8) + numbers[5].to_i
      return host, port
    end
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