using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;

namespace FileSocketServer
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                Console.WriteLine("Server Start and Listening...");
                IPEndPoint ipEnd = new IPEndPoint(IPAddress.Any, 5656);
                Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);
                sock.Bind(ipEnd);
                sock.Listen(100);
                Socket clientSock = sock.Accept(); //3-way handshake

                Console.WriteLine("Client Connected");
                byte[] clientData = new byte[1024 * 5000];
                string receivedPath = "c:/temp/";

                int receivedBytesLen = clientSock.Receive(clientData);
                int fileNameLen = BitConverter.ToInt32(clientData, 0);
                string fileName = Encoding.ASCII.GetString(clientData, 4, fileNameLen);

                Console.WriteLine("Client:{0}, File {1} ", clientSock.RemoteEndPoint, fileName);
                BinaryWriter bWrite = new BinaryWriter(File.Open(receivedPath + fileName, FileMode.Append));
                bWrite.Write(clientData, 4 + fileNameLen, receivedBytesLen - 4 - fileNameLen);
                Console.WriteLine("File: {0}  saved at path: {1}", fileName, receivedPath);

                bWrite.Close();
                clientSock.Close();
                Console.ReadLine();
            }
            catch (Exception ex)
            {
                Console.WriteLine("File Receiving fail." + ex.Message);
                Console.ReadLine();
            }
        }
    }
}