--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.base/share/classes/java/util/zip/CRC32.java	Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 1996, 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 java.util.zip;
+
+import java.nio.ByteBuffer;
+import sun.nio.ch.DirectBuffer;
+
+/**
+ * A class that can be used to compute the CRC-32 of a data stream.
+ *
+ * <p> Passing a {@code null} argument to a method in this class will cause
+ * a {@link NullPointerException} to be thrown.
+ *
+ * @see         Checksum
+ * @author      David Connelly
+ */
+public
+class CRC32 implements Checksum {
+    private int crc;
+
+    /**
+     * Creates a new CRC32 object.
+     */
+    public CRC32() {
+    }
+
+
+    /**
+     * Updates the CRC-32 checksum with the specified byte (the low
+     * eight bits of the argument b).
+     *
+     * @param b the byte to update the checksum with
+     */
+    public void update(int b) {
+        crc = update(crc, b);
+    }
+
+    /**
+     * Updates the CRC-32 checksum with the specified array of bytes.
+     *
+     * @throws  ArrayIndexOutOfBoundsException
+     *          if {@code off} is negative, or {@code len} is negative,
+     *          or {@code off+len} is greater than the length of the
+     *          array {@code b}
+     */
+    public void update(byte[] b, int off, int len) {
+        if (b == null) {
+            throw new NullPointerException();
+        }
+        if (off < 0 || len < 0 || off > b.length - len) {
+            throw new ArrayIndexOutOfBoundsException();
+        }
+        crc = updateBytes(crc, b, off, len);
+    }
+
+    /**
+     * Updates the CRC-32 checksum with the specified array of bytes.
+     *
+     * @param b the array of bytes to update the checksum with
+     */
+    public void update(byte[] b) {
+        crc = updateBytes(crc, b, 0, b.length);
+    }
+
+    /**
+     * Updates the checksum with the bytes from the specified buffer.
+     *
+     * The checksum is updated using
+     * buffer.{@link java.nio.Buffer#remaining() remaining()}
+     * bytes starting at
+     * buffer.{@link java.nio.Buffer#position() position()}
+     * Upon return, the buffer's position will
+     * be updated to its limit; its limit will not have been changed.
+     *
+     * @param buffer the ByteBuffer to update the checksum with
+     * @since 1.8
+     */
+    public void update(ByteBuffer buffer) {
+        int pos = buffer.position();
+        int limit = buffer.limit();
+        assert (pos <= limit);
+        int rem = limit - pos;
+        if (rem <= 0)
+            return;
+        if (buffer instanceof DirectBuffer) {
+            crc = updateByteBuffer(crc, ((DirectBuffer)buffer).address(), pos, rem);
+        } else if (buffer.hasArray()) {
+            crc = updateBytes(crc, buffer.array(), pos + buffer.arrayOffset(), rem);
+        } else {
+            byte[] b = new byte[rem];
+            buffer.get(b);
+            crc = updateBytes(crc, b, 0, b.length);
+        }
+        buffer.position(limit);
+    }
+
+    /**
+     * Resets CRC-32 to initial value.
+     */
+    public void reset() {
+        crc = 0;
+    }
+
+    /**
+     * Returns CRC-32 value.
+     */
+    public long getValue() {
+        return (long)crc & 0xffffffffL;
+    }
+
+    private native static int update(int crc, int b);
+    private native static int updateBytes(int crc, byte[] b, int off, int len);
+
+    private native static int updateByteBuffer(int adler, long addr,
+                                               int off, int len);
+}