private void OnNotInterested()
{
NotInterested?.Invoke(this);
}
public static ParsedMessage?TryParseMessage(ReadOnlySequence <byte> buf)
{
var be = Binary.BigEndian;
if (buf.Length < 4)
{
return(null);
}
var off = 4;
var len = be.GetUInt32(buf.Slice(0, 4).ToArray());
if (len == 0)
{
return new ParsedMessage {
Message = new KeepAlive(),
Position = buf.GetPosition(off)
}
}
;
if (len + off > buf.Length)
{
return(null);
}
var type = buf.Slice(off++, 1).FirstSpan[0];
IProtocolMessage?parsed = null;
switch (type)
{
case 0:
parsed = new Choke();
break;
case 1:
parsed = new Unchoke();
break;
case 2:
parsed = new Interested();
break;
case 3:
parsed = new NotInterested();
break;
case 4: {
var idx = be.GetUInt32(buf.Slice(off, 4).ToArray());
off += 4;
parsed = new Have {
PieceIndex = idx
};
break;
}
case 5: {
var bitfieldLen = (int)(len - 1);
var bits = buf.Slice(off, bitfieldLen).ToArray();
off += bitfieldLen;
parsed = new Bitfield {
Bits = bits
};
break;
}
case 6:
throw new NotImplementedException("Request");
case 7:
throw new NotImplementedException("Piece");
case 8:
throw new NotImplementedException("Cancel");
case 20:
throw new NotImplementedException("Extension Message");
default:
throw new ArgumentOutOfRangeException(nameof(type), $"Invalid Peer Message type {type}");
}
if (parsed != null)
{
return new ParsedMessage {
Message = parsed,
Position = buf.GetPosition(off)
}
}
;
return(null);
}
}
}