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

namespace DllEapFileUpload
{
    class TransferFiles
    {
        public static int SendData(Socket s, byte[] data)
        {
            int total = 0;
            int size = data.Length;
            int dataleft = size;
            int sent;

            while (total < size)
            {
                sent = s.Send(data, total, dataleft, SocketFlags.None);
                total += sent;
                dataleft -= sent;
            }

            return total;
        }

        public static int SendVarData(Socket s, byte[] data)
        {
            int total = 0;
            int size = data.Length;
            int dataleft = size;
            int sent;
            byte[] datasize = new byte[4];

            try
            {
                datasize = BitConverter.GetBytes(size);
                sent = s.Send(datasize);

                while (total < size)
                {
                    sent = s.Send(data, total, dataleft, SocketFlags.None);
                    total += sent;
                    dataleft -= sent;
                }

                return total;
            }
            catch
            {
                return 3;

            }
        }


        public static byte[] ReceiveData(Socket s, int size)
        {
            int total = 0;
            int dataleft = size;
            byte[] data = new byte[size];
            int recv;
            while (total < size)
            {
                recv = s.Receive(data, total, dataleft, SocketFlags.None);
                if (recv == 0)
                {
                    data = null;
                    break;
                }

                total += recv;
                dataleft -= recv;
            }
            return data;
        }

      

        public static byte[] ReceiveVarData(Socket s)
        {
            int total = 0;
            int recv;
            byte[] datasize = new byte[4];
            recv = s.Receive(datasize, 0, 4, SocketFlags.None);
            int size = BitConverter.ToInt32(datasize, 0);
            int dataleft = size;
            byte[] data = new byte[size];
            while (total < size)
            {
                recv = s.Receive(data, total, dataleft, SocketFlags.None);
                if (recv == 0)
                {
                    data = null;
                    break;
                }
                total += recv;
                dataleft -= recv;
            }
            return data;
        }
    }
}