//
// System.Net.IPEndPoint.cs
//
// Author:
//   Miguel de Icaza (miguel@ximian.com)
//
// (C) Ximian, Inc.  http://www.ximian.com
//

using System.Net.Sockets;

namespace System.Net {
	[Serializable]
	public class IPEndPoint : EndPoint {

		public const int MaxPort = 65535;
		public const int MinPort = 0;
		
		public IPEndPoint (IPAddress address, int port)
		{
			if(port<MinPort || port>MaxPort) {
				throw new ArgumentException("Invalid port");
			}
			
			Address = address;
			Port = port;
		}
		
		public IPEndPoint (long iaddr, int port)
		{
			if(port<MinPort || port>MaxPort) {
				throw new ArgumentException("Invalid port");
			}
			
			IPAddress address = new IPAddress (iaddr);
			
			Address = address;
			Port = port;
		}

		private IPAddress address;
		public IPAddress Address {
			get {
				return(address);
			}
			set {
				address=value;
			}
		}

		public override AddressFamily AddressFamily {
			get {
				return AddressFamily.InterNetwork;
			}
		}

		private int port;
		public int Port {
			get {
				return port;
			}
			set {
				// LAMESPEC: no mention of sanity checking
				port = value;
			}
		}

		// bytes 2 and 3 store the port, the rest
		// stores the address
		public override EndPoint Create(SocketAddress sockaddr) {
			int size=sockaddr.Size;
			
			// LAMESPEC: no mention of what to do if
			// sockaddr is bogus
			if(size<8) {
				// absolute minimum amount needed for
				// an address family, buffer size,
				// port and address
				return(null);
			}
			AddressFamily family=(AddressFamily)sockaddr[0];
			if(family!=AddressFamily.InterNetwork) {
				return(null);
			}
			
			int port=(((int)sockaddr[2])<<8) + (int)sockaddr[3];
			long address=(((long)sockaddr[4])<<24) +
				(((long)sockaddr[5])<<16) +
				(((long)sockaddr[6])<<8) +
				(long)sockaddr[7];

			IPEndPoint ipe = new IPEndPoint(address, port);
			
			return(ipe);
		}

		public override SocketAddress Serialize() {
			// .net produces a 16 byte buffer, even though
			// only 8 bytes are used. I guess its just a
			// holdover from struct sockaddr padding.
			SocketAddress sockaddr = new SocketAddress(AddressFamily.InterNetwork, 16);

			// bytes 2 and 3 store the port, the rest
			// stores the address
			sockaddr[2]=(byte)((port>>8) & 0xff);
			sockaddr[3]=(byte)(port & 0xff);

			sockaddr[4]=(byte)((address.Address >> 24) & 0xff);
			sockaddr[5]=(byte)((address.Address >> 16) & 0xff);
			sockaddr[6]=(byte)((address.Address >> 8) & 0xff);
			sockaddr[7]=(byte)(address.Address & 0xff);
			
			return(sockaddr);
		}

		public override string ToString() {
			return(address.ToString() + ":" + port);
		}

		public override string Equals (Object obj)
		{
			if (obj is System.Net.IPEndPoint) {
				return ( ((IPEndPoint) obj).port == port &&
					 ((IPEndPoint) obj).address == address);
			}

			return false;
		}

		public override string GetHashcode ()
		{
			return address.GetHashCode () + port;
		}
	}
}