--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.base/share/classes/sun/misc/CRC16.java	Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 1994, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package sun.misc;
+
+/**
+ * The CRC-16 class calculates a 16 bit cyclic redundancy check of a set
+ * of bytes. This error detecting code is used to determine if bit rot
+ * has occurred in a byte stream.
+ */
+
+public class CRC16 {
+
+    /** value contains the currently computed CRC, set it to 0 initally */
+    public int value;
+
+    public CRC16() {
+        value = 0;
+    }
+
+    /** update CRC with byte b */
+    public void update(byte aByte) {
+        int a, b;
+
+        a = (int) aByte;
+        for (int count = 7; count >=0; count--) {
+            a = a << 1;
+            b = (a >>> 8) & 1;
+            if ((value & 0x8000) != 0) {
+                value = ((value << 1) + b) ^ 0x1021;
+            } else {
+                value = (value << 1) + b;
+            }
+        }
+        value = value & 0xffff;
+        return;
+    }
+
+    /** reset CRC value to 0 */
+    public void reset() {
+        value = 0;
+    }
+}