Add soundbox.fromHardwareAddr()

This splits the soundbox.NewSoundbox() function into two smaller
functions.

1 files changed, 7 insertions, 5 deletions

diff --git a/soundbox.go b/soundbox.go
index 389d1da..d6a0a34 100644
--- a/soundbox.go
+++ b/soundbox.go
@@ -18,12 +18,14 @@ func NewSoundbox(mac string) (Soundbox, error) {
 	if err != nil {
 		return Soundbox{}, err
 	}
-	
-	if len(hardwareAddr) != 6 {
+
+	return fromHardwareAddr(hardwareAddr)
+}
+
+func fromHardwareAddr(addr net.HardwareAddr) (Soundbox, error) {
+	if len(addr) != 6 {
 		return Soundbox{}, fmt.Errorf("Only IEEE 802 MAC-48 addresses supported")
 	}
 
-	return Soundbox{
-		HardwareAddr: hardwareAddr,
-	}, nil
+	return Soundbox{HardwareAddr: addr}, nil
 }