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using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.IO;
namespace IvyBus
{
class IvyUDPStream
{
Socket socket;
BinaryReader input;
BinaryWriter output;
byte[] buffer;
MemoryStream out_stream;
MemoryStream in_stream;
/// the protocol version number
internal const int PROCOCOLVERSION = 4;
public IvyUDPStream(Socket _socket)
{
socket = _socket;
buffer = new byte[4096];
in_stream = new MemoryStream(buffer);
input = new BinaryReader( in_stream,Encoding.ASCII);
out_stream = new MemoryStream();
output = new BinaryWriter(out_stream, Encoding.ASCII);
}
/*
* message Syntax:
* this is a binary formated message use of network representation
*
* message Format:
protocol_version, TCP server port , lenAppId, appId, lenAppNameId, appName
*/
internal void receiveMsg(out IPEndPoint remote, out int version, out int port, out string appId, out string appName)
{
int len;
IPEndPoint remoteEP = new IPEndPoint(IPAddress.Any, 0);
EndPoint tempRemoteEP = (EndPoint)remoteEP;
remoteEP = null;
len = socket.ReceiveFrom(buffer, ref tempRemoteEP);
remote = (IPEndPoint)tempRemoteEP;
in_stream.Position = 0;
version = (ushort)IPAddress.NetworkToHostOrder((short)input.ReadUInt16());
port = (ushort)IPAddress.NetworkToHostOrder((short)input.ReadUInt16());
int lenAppId = (ushort)IPAddress.NetworkToHostOrder((short)input.ReadUInt16());
appId = new String(input.ReadChars(lenAppId));
int lenAppName = (ushort)IPAddress.NetworkToHostOrder((short)input.ReadUInt16());
appName = new String(input.ReadChars(lenAppName));
}
internal void sendMsg(IPEndPoint EPhost, int port, string appId, string appName)
{
output.Write((ushort)IPAddress.HostToNetworkOrder((short)(PROCOCOLVERSION)));
output.Write((ushort)IPAddress.HostToNetworkOrder((short)port));
output.Write((ushort)IPAddress.HostToNetworkOrder((short)appId.Length));
output.Write(appId.ToCharArray());
output.Write((ushort)IPAddress.HostToNetworkOrder((short)appName.Length));
output.Write(appName.ToCharArray());
output.Flush();
byte[] hellob = out_stream.GetBuffer();
socket.SendTo(hellob, (int)out_stream.Length, 0, EPhost);
}
internal void Close()
{
socket.Close();
}
}
}
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