add led state pseudo encoding

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

encoding.go

@@ -61,6 +61,7 @@ const (
 	EncQEMUPointerMotionChangePseudo EncodingType = -257
 	EncQEMUExtendedKeyEventPseudo    EncodingType = -258
 	EncTightPng                      EncodingType = -260
+	EncLedStatePseudo                EncodingType = -261
 	EncDesktopNamePseudo             EncodingType = -307
 	EncExtendedDesktopSizePseudo     EncodingType = -308
 	EncXvpPseudo                     EncodingType = -309

encoding_ledstate.go

@@ -0,0 +1,24 @@
+package rfb
+
+import "encoding/binary"
+
+type LedStatePseudoEncoding struct {
+	State uint8
+}
+
+func (*LedStatePseudoEncoding) Supported(Conn) bool {
+	return true
+}
+
+func (*LedStatePseudoEncoding) Type() EncodingType { return EncLedStatePseudo }
+
+func (enc *LedStatePseudoEncoding) Read(c Conn, rect *Rectangle) error {
+	if err := binary.Read(c, binary.BigEndian, &enc.State); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (enc *LedStatePseudoEncoding) Write(c Conn, rect *Rectangle) error {
+	return binary.Write(c, binary.BigEndian, []byte{enc.State})
+}