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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 IvyUDPStreamV3 : IvyUDPStream
{
StreamReader input;
StreamWriter output;
/// the protocol version number
internal const int PROCOCOLVERSION = 3;
public IvyUDPStreamV3(Socket _socket) : base( _socket , PROCOCOLVERSION )
{
input = new StreamReader(in_stream, Encoding.ASCII);
output = new StreamWriter(out_stream, Encoding.ASCII);
}
/*
* message Syntax:
* this is a text formated message
*
* message Format:
protocol_version, TCP server port , appId, appName
*/
private ushort DeserializeShort()
{
int read;
ushort ret = 0;
char digit;
// this will eat next non digit car ie space
do
{
read = input.Read();
if (read < 0)
throw new EndOfStreamException();
digit = (char)read;
if ( Char.IsDigit(digit) )
ret = (ushort)(ret * 10 + (digit-0x30));
} while (Char.IsDigit(digit));
return ret;
}
private string DeserializeString(char sep)
{
int read;
char car;
StringBuilder str = new StringBuilder();
// this will eat next non digit car ie space
do
{
read = input.Read();
if (read < 0)
throw new EndOfStreamException();
if (read == 0) break;
car = (char)read;
if (car != sep)
str.Append(car);
} while (car != sep);
return str.ToString();
}
internal override void Deserialize(out ushort version, out ushort port, out string appId, out string appName)
{
version = 0;
port = 0;
appId = "";
appName = "";
try {
version = DeserializeShort();
port = DeserializeShort();
//Optionel in V3 protocol depend on client version
appId = DeserializeString(' ');
appName = DeserializeString('\n');
}
catch( EndOfStreamException )
{
// Bad protocol message receive or without appId and appName
}
input.DiscardBufferedData();
}
private void Serialize(ushort arg, char sep)
{
output.Write(arg);
output.Write(sep);
}
private void Serialize(string arg, char sep)
{
output.Write(arg);
output.Write(sep);
}
internal override void Serialize(ushort port, string appId, string appName)
{
Serialize(PROCOCOLVERSION, ' ');
Serialize(port,' ');
Serialize(appId,' '); //No AppId in V3
Serialize(appName, '\n'); //No Appname in V3
output.Flush();
}
}
}
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