diff --git a/repository/link.go b/repository/link.go
index a99e5e4..0d4953b 100644
--- a/repository/link.go
+++ b/repository/link.go
@@ -126,6 +126,9 @@ type LinkPosition struct {
 	offset int64
 }
 
+func NewLinkPosition(link *Link, offset int64) *LinkPosition {
+	return &LinkPosition{link: link, offset: offset}
+}
 func (l *LinkPosition) Link() *Link {
 	return l.link
 }
@@ -157,6 +160,9 @@ func (l *LinkPort) Device() PortedDevice {
 func (l *LinkPort) IsPortA() bool {
 	return l.port == proto.Port_A
 }
+func (l *LinkPort) Link() *Link {
+	return l.link
+}
 
 type LinkRange struct {
 	link  *Link