protected override IEnumerable <FtpCommand> DataReceived(ReadOnlySpan <byte> data)
 {
     return(_collector.InternalCollect(data));
 }
 protected override IEnumerable <FtpCommand> DataReceived(IFtpConnection connection, byte[] data, int offset, int length)
 {
     return(_collector.InternalCollect(connection, data, offset, length));
 }