all: refactor attributes

attribute_software.go

@@ -0,0 +1,31 @@
+package stun
+
+// Software is SOFTWARE attribute.
+type Software struct {
+	Raw []byte
+}
+
+func (s *Software) String() string {
+	return string(s.Raw)
+}
+
+// NewSoftware returns *Software from string.
+func NewSoftware(software string) *Software {
+	return &Software{Raw: []byte(software)}
+}
+
+// AddTo adds Software attribute to m.
+func (s *Software) AddTo(m *Message) error {
+	m.Add(AttrSoftware, m.Raw)
+	return nil
+}
+
+// GetFrom decodes Software from m.
+func (s *Software) GetFrom(m *Message) error {
+	v, err := m.Get(AttrSoftware)
+	if err != nil {
+		return err
+	}
+	s.Raw = v
+	return nil
+}