You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: address.rs
    path of file: ./repos/turn-rs/stun/src/attribute
    
    the code of the file until where you have to start completion: use bytes::{BufMut, BytesMut};

use std::convert::TryInto;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};

use crate::StunError;

pub const FAMILY_IPV4: u8 = 0x01;
pub const FAMILY_IPV6: u8 = 0x02;

/// [RFC3489]: https://
    
pub fn xor(addr: &SocketAddr, token: &[u8]) -> SocketAddr {
    let port = addr.port() ^ (0x2112A442 >> 16) as u16;
    let ip_addr = match addr.ip() {
        IpAddr::V4(x) => xor_v4(x),
        IpAddr::V6(x) => xor_v6(x, token),
    };

    SocketAddr::new(ip_addr, port)
}