public ArraySegment <byte> Encode(MqttBasePacket packet)
{
if (packet == null)
{
throw new ArgumentNullException(nameof(packet));
}
// Leave enough head space for max header size (fixed + 4 variable remaining length = 5 bytes)
_packetWriter.Reset(5);
_packetWriter.Seek(5);
var fixedHeader = EncodePacket(packet, _packetWriter);
var remainingLength = (uint)(_packetWriter.Length - 5);
var remainingLengthSize = MqttPacketWriter.GetLengthOfVariableInteger(remainingLength);
var headerSize = FixedHeaderSize + remainingLengthSize;
var headerOffset = 5 - headerSize;
// Position cursor on correct offset on beginning of array (has leading 0x0)
_packetWriter.Seek(headerOffset);
_packetWriter.Write(fixedHeader);
_packetWriter.WriteVariableLengthInteger(remainingLength);
var buffer = _packetWriter.GetBuffer();
return(new ArraySegment <byte>(buffer, headerOffset, _packetWriter.Length - headerOffset));
}
public static byte[] AddMqttHeader(this IMqttPacketWriter writer, MqttControlPacketType header, byte[] body)
{
writer.Write(MqttPacketWriter.BuildFixedHeader(header));
writer.WriteVariableLengthInteger((uint)body.Length);
writer.Write(body, 0, body.Length);
return(writer.GetBuffer());
}
public void WriteTo(IMqttPacketWriter packetWriter)
{
if (packetWriter == null)
{
throw new ArgumentNullException(nameof(packetWriter));
}
packetWriter.WriteVariableLengthInteger((uint)_packetWriter.Length);
packetWriter.Write(_packetWriter);
}
