1// Copyright 2016 The Gorilla WebSocket Authors. All rights reserved.  Use of
 2// this source code is governed by a BSD-style license that can be found in the
 3// LICENSE file.
 4
 5// +build appengine
 6
 7package websocket
 8
 9func maskBytes(key [4]byte, pos int, b []byte) int {
10	for i := range b {
11		b[i] ^= key[pos&3]
12		pos++
13	}
14	return pos & 3
15}