public static SubscribePacket DecodeSubscribe(byte[] data)
{
var r = new Reader(data);
var type = r.ReadByte();
Guard.Assert((byte)PacketType.Subscribe, type);
var length = r.ReadInt32Vlq(out var _);
if (length + 2 > data.Length)
{
throw new InvalidOperationException("Packet too short");
}
var topicLength = r.ReadInt16BigEndian();
var topic = Encoding.GetString(r.ReadBytes(topicLength));
var qos = r.ReadByte();
var result = new SubscribePacket(topic)
{
QoS = qos
};
ProcessTTR(r, result);
Guard.Assert(r.Position, data.Length);
return(result);
}
public static Span <byte> EncodeSubscribe(SubscribePacket packet)
{
var w = new Writer();
w.Write((byte)PacketType.Subscribe);
var topicBytes = Encoding.GetBytes(packet.Topic);
var length = topicBytes.Length + 2;
w.WriteVlq(length);
//Topic
w.WriteBigEndian((short)topicBytes.Length);
w.Write(topicBytes);
w.Write((byte)packet.QoS);
return(w.Buffer.AsSpan(0, w.Position));
}
