Method encodeAttr

encoder.go:70–117

Encode attribute

(attr Attribute, checkTag bool)

// Encode attribute
func (me *messageEncoder) encodeAttr(attr Attribute, checkTag bool) error {
	// Wire format
	//     1 byte:   Tag
	//     2 bytes:  len(Name)
	//     variable: name
	//     2 bytes:  len(Value)
	//     variable  Value
	//
	// And each additional value comes as attribute
	// without name
	if len(attr.Values) == 0 {
		return errors.New("Attribute without value")
	}

	name := attr.Name
	for _, val := range attr.Values {
		tag := val.T

		if checkTag {
			if tag.IsDelimiter() || tag == TagMemberName || tag == TagEndCollection {
				return fmt.Errorf("Tag %s cannot be used with value", tag)
			}

			if uint(tag) >= 0x100 {
				return fmt.Errorf("Tag %s out of range", tag)
			}
		}

		err := me.encodeTag(tag)
		if err != nil {
			return err
		}

		err = me.encodeName(name)
		if err != nil {
			return err
		}

		err = me.encodeValue(val.T, val.V)
		if err != nil {
			return err
		}

		name = "" // Each additional value comes without name
	}

	return nil
}

// Encode 8-bit integer
func (me *messageEncoder) encodeU8(v uint8) error {