ssdp 0.3.1

An asynchronous abstraction for discovering devices and services on a network.
Documentation 
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use std::io::{self, Error, ErrorKind};
use std::net::{UdpSocket, SocketAddr};
use std::fmt;

/// Maximum length for packets received on a `PacketReceiver`.
pub const MAX_PCKT_LEN: usize = 600;

/// A `PacketReceiver` that abstracts over a network socket and reads full packets
/// from the connection. Packets received from this connection are assumed to
/// be no larger than what the typical MTU would be on a standard router.
///
/// See `net::packet::MAX_PCKT_LEN`.
pub struct PacketReceiver(UdpSocket);

impl PacketReceiver {
    /// Create a new PacketReceiver from the given UdpSocket.
    pub fn new(udp: UdpSocket) -> PacketReceiver {
        PacketReceiver(udp)
    }

    /// Receive a packet from the underlying connection.
    pub fn recv_pckt(&self) -> io::Result<(Vec<u8>, SocketAddr)> {
        let mut pckt_buf = vec![0u8; MAX_PCKT_LEN];

        let (size, addr) = try!(self.0.recv_from(&mut pckt_buf));

        // Check For Something That SHOULD NEVER Occur.
        if size > pckt_buf.len() {
            Err(Error::new(ErrorKind::Other, "UdpSocket Reported Receive Length Greater Than Buffer"))
        } else {
            // `truncate` does not reallocate the vec's backing storage
            pckt_buf.truncate(size);

            Ok((pckt_buf, addr))
        }
    }
}

impl fmt::Display for PacketReceiver {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self.0.local_addr() {
            Ok(addr) => write!(f, "{}", addr),
            Err(err) => write!(f, "{}", err),
        }
    }
}