Function AddLabelHeaderToPacket

label.go:24–33

AddLabelHeaderToPacket prefixes outgoing packets with the correct header if the label is not empty.

(buf []byte, label string)

// AddLabelHeaderToPacket prefixes outgoing packets with the correct header if
// the label is not empty.
func AddLabelHeaderToPacket(buf []byte, label string) ([]byte, error) {
	if label == "" {
		return buf, nil
	}
	if len(label) > LabelMaxSize {
		return nil, fmt.Errorf("label %q is too long", label)
	}

	return makeLabelHeader(label, buf), nil
}

// RemoveLabelHeaderFromPacket removes any label header from the provided
// packet and returns it along with the remaining packet contents.