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// System.Runtime.Remoting.Channels.CORBA.IIOPMessage.cs
//
// Author:
// DietmarMaurer (dietmar@ximian.com)
//
// (C) 2002 Ximian, Inc. http://www.ximian.com
using System.Runtime.Serialization.Formatters;
using System.Runtime.Serialization;
using System.Reflection;
using System.Collections;
using System.IO;
using System.Runtime.Remoting.Messaging;
namespace System.Runtime.Remoting.Channels.CORBA {
public sealed class IIOPMessage
{
public enum MessageType : byte {
Request = 0,
Response = 1,
Exception = 2,
Unknown = 3
}
public IIOPMessage ()
{
}
public static void SendExceptionMessage (Stream network_stream, string message)
{
// we use the uri field to encode the message text
SendMessageStream (network_stream, null, MessageType.Exception, message);
}
public static void SendMessageStream (Stream network_stream, MemoryStream data,
MessageType msg_type, string uri)
{
int data_len = 0;
if (data != null)
data_len = (int)data.Length;
int uri_len = 0;
if (uri != null)
uri_len = uri.Length;
int header_len = 12 + uri_len * 2;
int msg_len = data_len + header_len;
byte [] buffer = new byte [msg_len];
// magic header signature
buffer [0] = 255;
buffer [1] = 0;
buffer [2] = 255;
buffer [3] = (byte) msg_type;
// data length
buffer [4] = (byte) data_len;
buffer [5] = (byte) (data_len >> 8);
buffer [6] = (byte) (data_len >> 16);
buffer [7] = (byte) (data_len >> 24);
// uri length
buffer [8] = (byte) uri_len;
buffer [9] = (byte) (uri_len >> 8);
buffer [10] = (byte) (uri_len >> 16);
buffer [11] = (byte) (uri_len >> 24);
// uri
for (int i = 0; i < uri_len; i++) {
buffer [12 + i*2] = (byte) uri [i];
buffer [13 + i*2] = (byte) (uri [i] >> 8);
}
if (data_len > 0) {
byte [] data_buffer = data.GetBuffer ();
for (int i = 0; i < data_len; i++)
buffer [i + header_len] = data_buffer [i];
}
network_stream.Write (buffer, 0, msg_len);
}
public static MemoryStream ReceiveMessageStream (Stream network_stream,
out MessageType msg_type,
out string uri)
{
int data_len = 0;
int uri_len = 0;
msg_type = MessageType.Unknown;
uri = null;
// search for message header (255, 0, 255, msg_type, msg_len)
while (true) {
while (true) {
int x = network_stream.ReadByte ();
if (x != 255)
continue;
x = network_stream.ReadByte ();
if (x != 0)
continue;
x = network_stream.ReadByte ();
if (x != 255)
continue;
break;
}
msg_type = (MessageType)network_stream.ReadByte ();
byte [] buffer = new byte [8];
int bytes_read = network_stream.Read (buffer, 0, 8);
if (bytes_read != 8)
continue;
data_len = (buffer [0] | (buffer [1] << 8) |
(buffer [2] << 16) | (buffer [3] << 24));
uri_len = (buffer [4] | (buffer [5] << 8) |
(buffer [6] << 16) | (buffer [7] << 24));
if (uri_len > 0) {
byte [] uri_buffer = new byte [uri_len * 2];
bytes_read = network_stream.Read (uri_buffer, 0, uri_len * 2);
if (bytes_read != (uri_len * 2))
continue;
char [] uri_array = new char [uri_len];
for (int i = 0; i < uri_len; i++) {
uri_array [i] = (char) (uri_buffer [i * 2] | (uri_buffer [(i * 2) + 1] << 8));
}
uri = new string (uri_array);
}
break;
}
if (msg_type == MessageType.Exception)
throw new RemotingException ("\n" + uri + "\n" + "Rethrown at:\n");
byte [] stream_buffer = new byte [data_len];
if ((network_stream.Read (stream_buffer, 0, data_len)) != data_len)
throw new Exception ("packet size error");
return new MemoryStream (stream_buffer, false);
}
}
}
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