public Result AppendByte(byte b)
{
switch (state)
{
case State.NoPacket:
switch (b)
{
case InterruptSymbol:
return(new Result(interrupt: true));
case PacketStartSymbol:
state = State.Data;
packetData = new PacketData();
break;
}
break;
case State.Data:
if (!escape && b == PacketStopSymbol)
{
state = State.Checksum1;
break;
}
escape = !packetData.AddByte(b);
break;
case State.Checksum1:
checksum[0] = b;
state = State.Checksum2;
break;
case State.Checksum2:
checksum[1] = b;
state = State.NoPacket;
var checksumValue = (byte)Convert.ToUInt32(Encoding.ASCII.GetString(checksum), 16);
Packet packet;
if (!Packet.TryCreate(packetData, checksumValue, out packet))
{
return(new Result(packet, corruptedPacket: true));
}
return(new Result(packet));
}
return(null);
}
public Result AppendByte(byte b)
{
switch (state)
{
case State.NoPacket:
switch (b)
{
case InterruptSymbol:
return(new Result(interrupt: true));
case PacketStartSymbol:
state = State.Data;
buffer.Clear();
break;
}
break;
case State.Data:
if (escape)
{
b = (byte)(b ^ EscapeOffset);
buffer.Enqueue(b);
escape = false;
break;
}
switch (b)
{
case EscapeSymbol:
escape = true;
break;
case PacketStopSymbol:
state = State.Checksum1;
break;
default:
buffer.Enqueue(b);
break;
}
break;
case State.Checksum1:
checksum[0] = b;
state = State.Checksum2;
break;
case State.Checksum2:
checksum[1] = b;
state = State.NoPacket;
var checksumValue = (byte)Convert.ToUInt32(Encoding.ASCII.GetString(checksum), 16);
Packet packet;
if (!Packet.TryCreate(buffer.ToArray(), checksumValue, out packet))
{
return(new Result(packet, corruptedPacket: true));
}
return(new Result(packet));
}
return(null);
}
