/// <summary>
/// Receive a message from the server
/// </summary>
/// <param name="inMessage">the place where the message is going to be stored</param>
public void Receive(out HeaderPacketComm header, out string inMessage)
{
// Create a buffer to store the header
byte[] buffer = new byte[HeaderPacketComm.SIZE_HEADER_PACKET];
//Get the header from the socket
m_commSocket.Receive(buffer, HeaderPacketComm.SIZE_HEADER_PACKET, 0);
// Create a header with the received buffer
header = new HeaderPacketComm(buffer);
// If the header contains no message, return
if (header.m_size == 0)
{
inMessage = "";
return;
}
// Creates a buffer to store the message
byte[] infoBuffer = new byte[header.m_size];
//Get the actual message from the socket
m_commSocket.Receive(infoBuffer, (int)header.m_size, 0);
// Create a stream to store the buffer in a int type array
uint[] stream = new uint[(int)header.m_size / 4];
// copy the buffer to the array
Buffer.BlockCopy(infoBuffer, 0, stream, 0, infoBuffer.Length);
// Decrypt the message
Cryptography.decrypt(ref stream, m_key);
//Get the bytes of the decrypted message
byte[] decodedbyteArray = stream.SelectMany(BitConverter.GetBytes).ToArray();
//obtain the string message from the byte array
inMessage = System.Text.Encoding.ASCII.GetString(decodedbyteArray).Trim();
}
/// <summary>
/// Send a message to the server using the communication protocol
/// </summary>
/// <param name="messsage">The string representation of the message</param>
public uint SendMessage(string messsage, HeaderPacketComm.Command command)
{
// Creation of the header
HeaderPacketComm a = new HeaderPacketComm();
a.m_command = command;
lock (syncRoot)
{
a.m_idResponse = ++m_id_response;
}
uint lenght = (uint)messsage.Length + 1;
uint rest = lenght % 4;
a.m_size = rest == 0 ? lenght : lenght + 4 - rest;
// Get a byte array of the message
byte[] bytes = Encoding.ASCII.GetBytes(messsage);
///Create the stream block to encrypt
uint[] stream = new uint[a.m_size / 4];
Buffer.BlockCopy(bytes, 0, stream, 0, bytes.Length);
// Encrypt the message with the key of this class
Cryptography.encrypt(ref stream, m_key);
// Create the final buffer to be sent
byte[] buffer = new byte[HeaderPacketComm.SIZE_HEADER_PACKET + a.m_size];
// Copy the header in the buffer
Buffer.BlockCopy(a.getByteArray(), 0, buffer, 0, HeaderPacketComm.SIZE_HEADER_PACKET);
// Copy the encrypted stream into the buffer
Buffer.BlockCopy(stream, 0, buffer, HeaderPacketComm.SIZE_HEADER_PACKET, stream.Length * 4);
// Send the buffer to the server
m_commSocket.Send(buffer);
return(m_id_response);
}
