XDR incorrect encoding of uint16; tests and benchmarks

xdr/writer.go

@@ -79,10 +79,10 @@ func (w *Writer) WriteUint16(v uint16) (int, error) {
 		dl.Debugf("wr uint16=%d", v)
 	}
 
-	w.b[0] = byte(v >> 8)
-	w.b[1] = byte(v)
-	w.b[2] = 0
-	w.b[3] = 0
+	w.b[0] = 0
+	w.b[1] = 0
+	w.b[2] = byte(v >> 8)
+	w.b[3] = byte(v)
 
 	var l int
 	l, w.err = w.w.Write(w.b[:4])