index.js
function pton(af, addr, dest, index) {
  switch (af) {
    case IPV4_OCTETS:
      return pton4(addr, dest, index)
    case IPV6_OCTETS:
      return pton6(addr, dest, index)
    default:
      throw new Error('Unsupported ip address.')
  }
}
function pton(af, addr, dest, index) {
  switch (af) {
    case IPV4_OCTETS:
      return pton4(addr, dest, index)
    case IPV6_OCTETS:
      return pton6(addr, dest, index)
    default:
      throw new Error('Unsupported ip address.')
  }
}
function pton ( af , addr , dest , index ) { switch ( af ) { case IPV4_OCTETS : return pton4 ( addr , dest , index ) case IPV6_OCTETS : return pton6 ( addr , dest , index ) default : throw new Error ( 'Unsupported ip address.' ) } }
Convert ip address to the Buffer.

@param {number} af - type of an address.
@param {string} addr - source address.
@param {Buffer} [dest] - target buffer.
@param {number} [index] - start position in the target buffer.
Convert ip address to the Buffer .