Minecraft.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;

namespace Minecraft_Client
{
    class Minecraft
    {
        public void Update(TcpClient c)
        {
            byte[] data = new byte[5];
            data[0] = (byte)0;
            byte[] id = new byte[1];
            c.Client.Receive(id, 0, 1, SocketFlags.None);
            if (id[0] == (byte)0)
            {
                //Ping/alive package (send back!)
                Console.WriteLine("Client receiver keep-alive-package.");
                c.Client.Receive(data, 1, 4, SocketFlags.None);
                int kai = BitConverter.ToInt16(data, 1);
                Console.WriteLine("Sending keep-alive-package back server (KAI:" + kai.ToString() + ")");
                c.Client.Send(data);
            }
            else if (id[0] == (byte)3)
            {
                short len;
                byte[] buffer = new byte[2];
                c.Client.Receive(buffer, 1, 3, SocketFlags.None);
                len = (short)BitConverter.ToInt16(buffer, 0);
                Console.WriteLine("Received chatmsg (len:" + len.ToString());
            }
        }

        public bool Handshake(string username,TcpClient c)
        {
            //array
            byte[] data = new byte[3 + (username.Length *2)];

            //packet id
            data[0] = (byte)2;

            //short len
            byte[] sh = new byte[2];
            sh = BitConverter.GetBytes((short)username.Length);
            Array.Reverse(sh);
            sh.CopyTo(data, 1);

            //username
            byte[] name = Encoding.Unicode.GetBytes(username);
            name.CopyTo(data, 3);

            c.Client.Send(data);

            byte[] pid = new byte[1];
            c.Client.Receive(pid, 0, 1, SocketFlags.None);
            if (pid[0] == (byte)2)
            {
                return true;
            }
            else return false;
        }

        public bool RequestLogin(string username,TcpClient c)
        {
            //array
            byte id = (byte)1;
            byte[] protecol = new byte[4]; protecol = BitConverter.GetBytes((int)22); Array.Reverse(protecol);//v1.0
            byte[] len = new byte[2]; len = BitConverter.GetBytes((username.Length * 2)); Array.Reverse(len);
            byte[] usrname = new byte[username.Length * 2]; usrname = Encoding.Unicode.GetBytes(username);
            byte[] lon = new byte[8]; lon = BitConverter.GetBytes((long)0); Array.Reverse(lon);
            byte[] intt = new byte[4]; intt = BitConverter.GetBytes((int)0); Array.Reverse(intt);
            byte empty = (byte)0;



            //Creating byte array
            byte[] data = new byte[23 + (username.Length * 2)];
            //adding id
            data[0] = id;
            //adding protecol
            protecol.CopyTo(data, 1);
            //adding username length short
            len.CopyTo(data, 5);
            //adding username
            usrname.CopyTo(data, 7);

            //new index calculation
            int index = (7 + (username.Length * 2));

            //adding long
            lon.CopyTo(data, index);
            index = index + 8;
            //adding int
            intt.CopyTo(data, index);
            index = index + 4;
            //adding bytes
            data[index] = empty;
            data[index +1] = empty;
            data[index +2] = empty;
            data[index +3] = empty;

            c.Client.Send(data);
            try
            {
                byte[] pid = new byte[1];
                try
                {
                    if (c.Connected)
                    {
                        c.Client.Receive(pid, 0, 1, SocketFlags.None);
                    }
                    else return false; //kick
                }
                catch
                {
                    //server disconnected
                    return false;
                }
                //Got package back ?
                return true;
            }
            catch
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("Server closed connection.");
                while (true) { }
            }
        }

        public void SendChatMessage(string message, TcpClient c)
        {
            byte[] chat = new byte[3 + (message.Length * 2)];
            chat[0] = (byte)3;

            byte[] msglen = new byte[2];
            msglen = BitConverter.GetBytes(message.Length);
            Array.Reverse(msglen);
            msglen.CopyTo(chat, 1);

            Encoding.Unicode.GetBytes(message).CopyTo(chat, 3);
            c.Client.Send(chat);
        }
    }
}