namespace System.Net.NetworkInformation {
 
    using System.Net;
    using System.Net.Sockets;
    using System.Security.Permissions;
    using System;
    using System.Runtime.InteropServices;
    using System.Collections;
    using System.ComponentModel;
    using System.Threading;
 
   
 
 
    /// <summary>
    /// Represents an active Tcp connection.</summary>
    internal class SystemTcpConnectionInformation:TcpConnectionInformation {
        IPEndPoint localEndPoint;
        IPEndPoint remoteEndPoint;
        TcpState state;
 
        internal SystemTcpConnectionInformation(MibTcpRow row) {
            state = row.state;
 
            //port is returned in Big-Endian - most significant bit on left
            //unfortunately, its done at the word level and not the dword level.
 
            int localPort = row.localPort1<<8|row.localPort2;
            int remotePort = ((state == TcpState.Listen)?0:row.remotePort1<<8|row.remotePort2);
 
            localEndPoint = new IPEndPoint(row.localAddr,(int)localPort);
            remoteEndPoint= new IPEndPoint(row.remoteAddr,(int)remotePort);
        }
 
        // IPV6 version of the Tcp row 
        internal SystemTcpConnectionInformation(MibTcp6RowOwnerPid row) {
            state = row.state;
 
            //port is returned in Big-Endian - most significant bit on left
            //unfortunately, its done at the word level and not the dword level.
            
            int localPort = row.localPort1 << 8 | row.localPort2;
            int remotePort = ((state == TcpState.Listen) ? 0 : row.remotePort1 << 8 | row.remotePort2);
 
            localEndPoint = new IPEndPoint(new IPAddress(row.localAddr, row.localScopeId), (int)localPort);
            remoteEndPoint = new IPEndPoint(new IPAddress(row.remoteAddr, row.remoteScopeId), (int)remotePort);
        }
 
 
        public override TcpState State{get {return state;}}
        public override IPEndPoint LocalEndPoint{get {return localEndPoint;}}
        public override IPEndPoint RemoteEndPoint{get {return remoteEndPoint;}}
    }
 }