SocketStream.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / ManagedLibraries / Remoting / Channels / CORE / SocketStream.cs / 1305376 / SocketStream.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
//==========================================================================
//  File:       SocketStream.cs 
// 
//  Summary:    Stream used for reading from a socket by remoting channels.
// 
//=========================================================================

using System;
using System.IO; 
using System.Runtime.Remoting;
using System.Net; 
using System.Net.Sockets; 

 
namespace System.Runtime.Remoting.Channels
{

    // Basically the same as NetworkStream, but adds support for timeouts. 
    internal sealed class SocketStream : Stream
    { 
        private Socket _socket; 
        private int    _timeout = 0; // throw timout exception if a read takes longer than this many milliseconds
        // as per http://support.microsoft.com/default.aspx?scid=kb%3ben-us%3b201213 
        // we shouldn't write more than 64K synchronously to a socket
        const int maxSocketWrite = 64 * 1024;   // 64k
        const int maxSocketRead =  4 * 1024 * 1024;  // 4 MB
 

        public SocketStream(Socket socket) 
        { 
            if (socket == null)
                throw new ArgumentNullException("socket"); 

            _socket = socket;
        } // SocketStream
 

        // Stream implementation 
 
        public override bool CanRead { get { return true; } }
        public override bool CanSeek { get { return false; } } 
        public override bool CanWrite { get { return true; } }

        public override long Length { get { throw new NotSupportedException(); } }
 
        public override long Position
        { 
            get { throw new NotSupportedException(); } 
            set { throw new NotSupportedException(); }
        } // Position 

        public override long Seek(long offset, SeekOrigin origin)
        {
            throw new NotSupportedException(); 
        }
 
        public override int Read(byte[] buffer, int offset, int size) 
        {
 
            if (_timeout <= 0)
            {
                    return _socket.Receive(buffer, offset, Math.Min(size, maxSocketRead), SocketFlags.None);
            } 
            else
            { 
                IAsyncResult ar = _socket.BeginReceive(buffer, offset, Math.Min(size, maxSocketRead), SocketFlags.None, null, null); 
                if (_timeout>0 && !ar.IsCompleted)
                { 
                    ar.AsyncWaitHandle.WaitOne(_timeout, false);
                    if (!ar.IsCompleted)
                        throw new RemotingTimeoutException();
 
                }
                return _socket.EndReceive(ar); 
            } 
        } // Read
 
        public override void Write(byte[] buffer, int offset, int count)
        {
            int bytesToWrite = count;
 
            while (bytesToWrite > 0)
            { 
                count = Math.Min(bytesToWrite, maxSocketWrite); 
                _socket.Send(buffer, offset, count, SocketFlags.None);
                bytesToWrite -= count; 
                offset += count;
            }
        } // Write
 
        protected override void Dispose(bool disposing)
        { 
            try { 
                if (disposing)
                    _socket.Close(); 
            }
            finally {
                base.Dispose(disposing);
            } 
        }
 
        public override void Flush() {} 

 
        public override IAsyncResult BeginRead(
            byte[] buffer,
            int offset,
            int size, 
            AsyncCallback callback,
            Object state) 
        { 
            IAsyncResult asyncResult =
                _socket.BeginReceive( 
                    buffer,
                    offset,
                    Math.Min(size, maxSocketRead),
                    SocketFlags.None, 
                    callback,
                    state); 
 
            return asyncResult;
        } // BeginRead 


        public override int EndRead(IAsyncResult asyncResult)
        { 
            return _socket.EndReceive(asyncResult);
        } // EndRead 
 

        public override IAsyncResult BeginWrite( 
            byte[] buffer,
            int offset,
            int size,
            AsyncCallback callback, 
            Object state)
        { 
            IAsyncResult asyncResult = 
                _socket.BeginSend(
                    buffer, 
                    offset,
                    size,
                    SocketFlags.None,
                    callback, 
                    state);
 
                return asyncResult; 
        } // BeginWrite
 

        public override void EndWrite(IAsyncResult asyncResult)
        {
            _socket.EndSend(asyncResult); 
        } // EndWrite
 
 
        public override void SetLength(long value) { throw new NotSupportedException(); }
 
    } // class SocketStream

} // namespace System.Runtime.Remoting.Channels

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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SocketStream.cs source code in C# .NET

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