mcs/class/System.Runtime.Remoting/System.Runtime.Remoting.Channels.Ipc.Win32/IpcTransport.cs

   1 //
   2 // System.Runtime.Remoting.Channels.Ipc.Win32.IpcTransport.cs
   3 //
   4 // Author: Robert Jordan (robertj@gmx.net)
   5 //
   6 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
   7 //
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29
  30 using System;
  31 using System.IO;
  32 using System.Runtime.Remoting;
  33 using System.Runtime.Remoting.Channels;
  34 using System.Runtime.Remoting.Messaging;
  35 using System.Runtime.Serialization.Formatters.Binary;
  36
  37 namespace System.Runtime.Remoting.Channels.Ipc.Win32
  38 {
  39     /// <summary>
  40     /// IPC transport helper
  41     /// </summary>
  42     internal class IpcTransport
  43     {
  44         readonly NamedPipeSocket socket;
  45         readonly BinaryFormatter formatter = new BinaryFormatter();
  46
  47         /// <summary>
  48         /// Creates a new object.
  49         /// </summary>
  50         /// <param name="socket">The named pipe.</param>
  51         public IpcTransport(NamedPipeSocket socket)
  52         {
  53             this.socket = socket;
  54         }
  55
  56         /// <summary>
  57         /// Writes a request.
  58         /// </summary>
  59         /// <param name="header"></param>
  60         /// <param name="requestStream"></param>
  61         public void Write(ITransportHeaders header, Stream requestStream)
  62         {
  63             Stream bs = socket.GetStream();
  64
  65             MemoryStream m = new MemoryStream();
  66             formatter.Serialize(m, header);
  67             m.Position = 0;
  68             byte[] bytes = BitConverter.GetBytes((int)m.Length);
  69             bs.Write(bytes, 0, bytes.Length);
  70             m.WriteTo(bs);
  71
  72             try
  73             {
  74                 bytes = BitConverter.GetBytes((int)requestStream.Length);
  75                 bs.Write(bytes, 0, bytes.Length);
  76                 IpcChannelHelper.Copy(requestStream, bs);
  77             }
  78             catch
  79             {
  80                 bs.Write(bytes, 0, bytes.Length);
  81             }
  82
  83             bs.Flush();
  84         }
  85
  86         /// <summary>
  87         /// Reads a response.
  88         /// </summary>
  89         /// <param name="headers"></param>
  90         /// <param name="responseStream"></param>
  91         public void Read(out ITransportHeaders headers, out Stream responseStream)
  92         {
  93             byte[] bytes;
  94             long length;
  95
  96             bytes = BitConverter.GetBytes(int.MaxValue);
  97             socket.Receive(bytes, 0, bytes.Length);
  98             length = BitConverter.ToInt32(bytes, 0);
  99
 100             if (length != int.MaxValue && length > 0)
 101             {
 102                 bytes = new byte[length];
 103                 socket.Receive(bytes, 0, (int)length);
 104
 105                 MemoryStream m = new MemoryStream(bytes);
 106                 headers = (ITransportHeaders) formatter.Deserialize(m);
 107             }
 108             else
 109             {
 110                 headers = new TransportHeaders();
 111             }
 112
 113             bytes = BitConverter.GetBytes(int.MaxValue);
 114             socket.Receive(bytes, 0, bytes.Length);
 115             length = BitConverter.ToInt32(bytes, 0);
 116             if (length != int.MaxValue && length > 0)
 117             {
 118                 bytes = new byte[length];
 119                 socket.Receive(bytes, 0, (int)length);
 120                 responseStream = new MemoryStream(bytes);
 121             }
 122             else
 123             {
 124                 responseStream = new MemoryStream(new byte[0]);
 125             }
 126         }
 127
 128         /// <summary>
 129         /// Closes the unterlying named pipe socket.
 130         /// </summary>
 131         public void Close()
 132         {
 133             socket.Close();
 134         }
 135     }
 136 }
 137