/// <summary>
/// Determines how large the incoming header will be by
/// inspecting the first byte, then initiates reading the header.
/// </summary>
private void ReadSizeCallback(IAsyncResult result)
{
int bytesRead = this.connection.Client.EndReceive(result);
if (bytesRead == 0 && result.IsCompleted)
{
// TODO: world server disconnect
Game.UI.LogLine("Server has closed the connection");
Game.Exit();
return;
}
Interlocked.Increment(ref transferred);
Interlocked.Increment(ref received);
AuthenticationCrypto.Decrypt(ReceiveData, 0, 1);
if ((ReceiveData[0] & 0x80) != 0)
{
// need to resize the buffer
byte temp = ReceiveData[0];
ReceiveData = new byte[5];
ReceiveData[0] = (byte)((0x7f & temp));
Remaining = 4;
}
else
{
Remaining = 3;
}
Index = 1;
BeginRead(new AsyncCallback(ReadHeaderCallback));
}
/// <summary>
/// Reads the rest of the incoming header.
/// </summary>
private void ReadHeaderCallback(IAsyncResult result)
{
//if (ReceiveData.Length != 4 && ReceiveData.Length != 5)
// throw new Exception("ReceiveData.Length not in order");
int bytesRead = this.connection.Client.EndReceive(result);
if (bytesRead == 0 && result.IsCompleted)
{
// TODO: world server disconnect
Game.UI.LogLine("Server has closed the connection");
Game.Exit();
return;
}
Interlocked.Add(ref transferred, bytesRead);
Interlocked.Add(ref received, bytesRead);
if (bytesRead == Remaining)
{
// finished reading header
// the first byte was decrypted already, so skip it
AuthenticationCrypto.Decrypt(ReceiveData, 1, ReceiveData.Length - 1);
ServerHeader header = new ServerHeader(ReceiveData);
Game.UI.LogLine(header.ToString(), LogLevel.Debug);
if (header.InputDataLength > 5 || header.InputDataLength < 4)
{
Game.UI.LogException(String.Format("Header.InputataLength invalid: {0}", header.InputDataLength));
}
if (header.Size > 0)
{
// read the packet payload
Index = 0;
Remaining = header.Size;
ReceiveData = new byte[header.Size];
BeginRead(new AsyncCallback(ReadPayloadCallback), header);
}
else
{
// the packet is just a header, start next packet
HandlePacket(new InPacket(header));
Start();
}
}
else
{
// more header to read
Index += bytesRead;
Remaining -= bytesRead;
BeginRead(new AsyncCallback(ReadHeaderCallback));
}
}