// serialize serializes a message. It returns an error if serialization
// failed, or if the message was too big to serialize based on the current
// msgSize. The config lock is held during serialize.
func (fs *FileServer) serialize(m qp.Message) ([]byte, error) {
var (
mt qp.MessageType
err error
)
if mt, err = fs.proto.MessageType(m); err != nil {
return nil, err
}
l := m.EncodedSize() + qp.HeaderSize
if l > int(fs.msgSize) {
return nil, errMsgTooBig
}
b := make([]byte, l)
if err = m.Marshal(b[qp.HeaderSize:]); err != nil {
return nil, err
}
binary.LittleEndian.PutUint32(b[0:4], uint32(l))
b[4] = byte(mt)
return b, nil
}
