private void ManipulateBuffer()
{
if (m_encrypted)
{
const int HeaderSize = 4;
while (m_cursor > HeaderSize && m_connected) //header room + still connected
{
int packetSize = MapleCipher.GetPacketLength(m_packetBuffer);
if (m_cursor < packetSize + HeaderSize) //header + packet room
{
break;
}
byte[] buffer = new byte[packetSize];
Buffer.BlockCopy(m_packetBuffer, HeaderSize, buffer, 0, packetSize); //copy packet
m_serverCipher.Transform(buffer); //decrypt
m_cursor -= packetSize + HeaderSize; //fix len
if (m_cursor > 0) //move reamining bytes
{
Buffer.BlockCopy(m_packetBuffer, packetSize + HeaderSize, m_packetBuffer, 0, m_cursor);
}
if (OnPacket != null)
{
OnPacket(this, buffer);
}
buffer = null; //get rid of buffer
}
}
else if (m_cursor >= 2)
{
const int HeaderSize = 2;
short packetSize = BitConverter.ToInt16(m_packetBuffer, 0);
if (m_cursor >= packetSize + HeaderSize)
{
byte[] buffer = new byte[packetSize];
Buffer.BlockCopy(m_packetBuffer, HeaderSize, buffer, 0, packetSize);
PacketReader packet = new PacketReader(buffer);
short major = packet.ReadShort();
string minor = packet.ReadMapleString();
byte[] riv = packet.ReadBytes(4);
byte[] siv = packet.ReadBytes(4);
m_clientCipher = new MapleCipher(major, riv, m_aesCipher, CipherType.Encrypt);
m_serverCipher = new MapleCipher(major, siv, m_aesCipher, CipherType.Decrypt);
byte locale = packet.ReadByte();
m_encrypted = true; //start waiting for encrypted packets
if (OnHandshake != null)
{
var info = new ServerInfo()
{
Version = major,
Subversion = minor,
Riv = riv,
Siv = siv,
Locale = locale
};
OnHandshake(this, info);
}
buffer = null; //get rid of buffer
m_cursor = 0; //reset stream
}
}
}
