1 files changed, 55 insertions, 0 deletions
diff --git a/vendor/github.com/pion/turn/v2/internal/proto/evenport.go b/vendor/github.com/pion/turn/v2/internal/proto/evenport.go
new file mode 100644
index 0000000..a5a3882
--- /dev/null
+++ b/vendor/github.com/pion/turn/v2/internal/proto/evenport.go
@@ -0,0 +1,55 @@
+package proto
+
+import "github.com/pion/stun"
+
+// EvenPort represents EVEN-PORT attribute.
+//
+// This attribute allows the client to request that the port in the
+// relayed transport address be even, and (optionally) that the server
+// reserve the next-higher port number.
+//
+// RFC 5766 Section 14.6
+type EvenPort struct {
+	// ReservePort means that the server is requested to reserve
+	// the next-higher port number (on the same IP address)
+	// for a subsequent allocation.
+	ReservePort bool
+}
+
+func (p EvenPort) String() string {
+	if p.ReservePort {
+		return "reserve: true"
+	}
+	return "reserve: false"
+}
+
+const (
+	evenPortSize = 1
+	firstBitSet  = (1 << 8) - 1 // 0b100000000
+)
+
+// AddTo adds EVEN-PORT to message.
+func (p EvenPort) AddTo(m *stun.Message) error {
+	v := make([]byte, evenPortSize)
+	if p.ReservePort {
+		// Set first bit to 1.
+		v[0] = firstBitSet
+	}
+	m.Add(stun.AttrEvenPort, v)
+	return nil
+}
+
+// GetFrom decodes EVEN-PORT from message.
+func (p *EvenPort) GetFrom(m *stun.Message) error {
+	v, err := m.Get(stun.AttrEvenPort)
+	if err != nil {
+		return err
+	}
+	if err = stun.CheckSize(stun.AttrEvenPort, len(v), evenPortSize); err != nil {
+		return err
+	}
+	if v[0]&firstBitSet > 0 {
+		p.ReservePort = true
+	}
+	return nil
+}