/*
 * Traditional DNS header RCODEs (4-bits) defined by IANA in
 * https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml
 */

exports.toString = function (rcode) {
  switch (rcode) {
    case 0: return 'NOERROR'
    case 1: return 'FORMERR'
    case 2: return 'SERVFAIL'
    case 3: return 'NXDOMAIN'
    case 4: return 'NOTIMP'
    case 5: return 'REFUSED'
    case 6: return 'YXDOMAIN'
    case 7: return 'YXRRSET'
    case 8: return 'NXRRSET'
    case 9: return 'NOTAUTH'
    case 10: return 'NOTZONE'
    case 11: return 'RCODE_11'
    case 12: return 'RCODE_12'
    case 13: return 'RCODE_13'
    case 14: return 'RCODE_14'
    case 15: return 'RCODE_15'
  }
  return 'RCODE_' + rcode
}

exports.toRcode = function (code) {
  switch (code.toUpperCase()) {
    case 'NOERROR': return 0
    case 'FORMERR': return 1
    case 'SERVFAIL': return 2
    case 'NXDOMAIN': return 3
    case 'NOTIMP': return 4
    case 'REFUSED': return 5
    case 'YXDOMAIN': return 6
    case 'YXRRSET': return 7
    case 'NXRRSET': return 8
    case 'NOTAUTH': return 9
    case 'NOTZONE': return 10
    case 'RCODE_11': return 11
    case 'RCODE_12': return 12
    case 'RCODE_13': return 13
    case 'RCODE_14': return 14
    case 'RCODE_15': return 15
  }
  return 0
}