/// <summary>
/// Encode the HandshakePacket to a byte array. Encode the Header then the payload with all the frames.
/// </summary>
/// <returns>The raw packet</returns>
public override byte[] Encode()
{
List <byte> lpack = new List <byte>(base.Encode());
Length.Value = (ulong)PacketNumberLength + (ulong)Payload.Length;
lpack.AddRange(Length.Encode());
int packetNumberBitsIndex_ = lpack.Count * 8;
lpack.AddRange(new byte[PacketNumberLength]);
lpack.AddRange(Payload);
// Set packet type to "Handshake Packet"
lpack[0] &= 0b11001111; // clear
lpack[0] += 0b00100000;
// Set packet number length
lpack[0] &= 0b11111100; // clear
lpack[0] += Convert.ToByte(PacketNumberLength - 1);
// Set packet number
byte[] packet = lpack.ToArray();
BitUtils.WriteNByteFromInt(packetNumberBitsIndex_, packet, PacketNumber, (int)PacketNumberLength);
return(packet);
}
/// <summary>
/// Encode the packet to a byte array. Encode the Header then the payload with all the frames.
/// </summary>
/// <returns>The raw packet</returns>
public override byte[] Encode()
{
List <byte> lpack = new List <byte>(base.Encode());
if (TokenLength.Value != (UInt64)Token.Length)
{
throw new CorruptedPacketException("mismatch between Token.Length and TokenLength");
}
lpack.AddRange(TokenLength.Encode());
lpack.AddRange(Token);
// Append padding frames so that the UDP datagram is at least 1200 bytes, per the spec
// TODO: make this more efficient by computing the minimum number of padding frames needed
byte[] padding = Enumerable.Repeat(new PaddingFrame().Type, 1200).ToArray();
// TODO: use List<> everywhere instead of arrays?
List <byte> PayloadList = new List <byte>(EncodeFrames());
PayloadList.AddRange(padding);
Payload = PayloadList.ToArray();
Length.Value = (ulong)PacketNumberLength + (ulong)Payload.Length;
lpack.AddRange(Length.Encode());
int packetNumberBitsIndex_ = lpack.Count * 8;
lpack.AddRange(new byte[PacketNumberLength]);
lpack.AddRange(Payload);
// Set packet type to "Initial Packet"
lpack[0] &= 0b11001111;
// Set packet number length
lpack[0] &= 0b11111100; // clear
lpack[0] += Convert.ToByte(PacketNumberLength - 1);
// Set packet number
byte[] packet = lpack.ToArray();
BitUtils.WriteNByteFromInt(packetNumberBitsIndex_, packet, PacketNumber, (int)PacketNumberLength);
return(packet);
}