diff --git a/encoding/ucs2.go b/encoding/ucs2.go
index 9ec252f..34883fb 100644
--- a/encoding/ucs2.go
+++ b/encoding/ucs2.go
@@ -4,10 +4,16 @@ import "bytes"
 
 type UCS2Coder struct{}
 
-func (c *UCS2Coder) Encode(s string, buf *bytes.Buffer) {
+func (c *UCS2Coder) Encode(s *string, buf *bytes.Buffer) error {
+	panic("UCS2 not implemented yet")
+}
+func (c *UCS2Coder) Decode(buf *bytes.Buffer) (string, error) {
 	panic("UCS2 not implemented yet")
 }
 
-func (c *UCS2Coder) Decode(buf *bytes.Buffer) string {
-	panic("UCS2 not implemented yet")
+func (c UCS2Coder) EncodesInto(s *string) int {
+	return len(*s) * 2
+}
+func (c UCS2Coder) DecodesInto(buf *bytes.Buffer) int {
+	return buf.Len() / 2
 }