gistfile1.txt

pub fn parse_ip(payload: &[u8]) -> Result<IpAddr, DecodeError> {
    match payload.len() {
        4 => Ok(Ipv4Addr::new(payload[0], payload[1], payload[2], payload[3]).into()),
        16 => Ok(Ipv6Addr::from([
            payload[0],
            payload[1],
            payload[2],
            payload[3],
            payload[4],
            payload[5],
            payload[6],
            payload[7],
            payload[8],
            payload[9],
            payload[10],
            payload[11],
            payload[12],
            payload[13],
            payload[14],
            payload[15],
        ])
        .into()),
        _ => Err(format!("invalid IPv6 address: {:?}", payload).into()),
    }
}