//
// Mono.Unix.UnixEndPoint: EndPoint derived class for AF_UNIX family sockets.
//
// Authors:
//	Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (C) 2003 Ximian, Inc (http://www.ximian.com)
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

namespace Mono.Unix
{
    [Serializable]
    public class UnixEndPoint : EndPoint
    {
        string filename;

        public UnixEndPoint(string filename)
        {
            if (filename == null)
                throw new ArgumentNullException("filename");

            if (filename.Length == 0)
                throw new ArgumentException("Cannot be empty.", "filename");
            this.filename = filename;
        }

        public string Filename
        {
            get
            {
                return (filename);
            }
            set
            {
                filename = value;
            }
        }

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

        public override EndPoint Create(SocketAddress socketAddress)
        {
            /*
			 * Should also check this
			 *
			int addr = (int) AddressFamily.Unix;
			if (socketAddress [0] != (addr & 0xFF))
				throw new ArgumentException ("socketAddress is not a unix socket address.");

			if (socketAddress [1] != ((addr & 0xFF00) >> 8))
				throw new ArgumentException ("socketAddress is not a unix socket address.");
			 */

            if (socketAddress.Size == 2)
            {
                // Empty filename.
                // Probably from RemoteEndPoint which on linux does not return the file name.
                UnixEndPoint uep = new UnixEndPoint("a");
                uep.filename = "";
                return uep;
            }
            int size = socketAddress.Size - 2;
            byte[] bytes = new byte[size];
            for (int i = 0; i < bytes.Length; i++)
            {
                bytes[i] = socketAddress[i + 2];
                // There may be junk after the null terminator, so ignore it all.
                if (bytes[i] == 0)
                {
                    size = i;
                    break;
                }
            }

            string name = Encoding.Default.GetString(bytes, 0, size);
            return new UnixEndPoint(name);
        }

        public override SocketAddress Serialize()
        {
            byte[] bytes = Encoding.Default.GetBytes(filename);
            SocketAddress sa = new SocketAddress(AddressFamily, 2 + bytes.Length + 1);
            // sa [0] -> family low byte, sa [1] -> family high byte
            for (int i = 0; i < bytes.Length; i++)
                sa[2 + i] = bytes[i];

            //NULL suffix for non-abstract path
            sa[2 + bytes.Length] = 0;

            return sa;
        }

        public override string ToString()
        {
            return (filename);
        }

        public override int GetHashCode()
        {
            return filename.GetHashCode(StringComparison.Ordinal);
        }

        public override bool Equals(object o)
        {
            UnixEndPoint other = o as UnixEndPoint;
            if (other == null)
                return false;

            return (other.filename == filename);
        }
    }
}
