--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/util/zip/Adler32.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,93 @@
+/*
+ * Copyright 1996-2005 Sun Microsystems, Inc. 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. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package java.util.zip;
+
+/**
+ * A class that can be used to compute the Adler-32 checksum of a data
+ * stream. An Adler-32 checksum is almost as reliable as a CRC-32 but
+ * can be computed much faster.
+ *
+ * @see Checksum
+ * @author David Connelly
+ */
+public
+class Adler32 implements Checksum {
+ private int adler = 1;
+
+ /**
+ * Creates a new Adler32 object.
+ */
+ public Adler32() {
+ }
+
+
+ /**
+ * Updates checksum with specified byte.
+ *
+ * @param b an array of bytes
+ */
+ public void update(int b) {
+ adler = update(adler, b);
+ }
+
+ /**
+ * Updates checksum with specified array of bytes.
+ */
+ 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();
+ }
+ adler = updateBytes(adler, b, off, len);
+ }
+
+ /**
+ * Updates checksum with specified array of bytes.
+ */
+ public void update(byte[] b) {
+ adler = updateBytes(adler, b, 0, b.length);
+ }
+
+ /**
+ * Resets checksum to initial value.
+ */
+ public void reset() {
+ adler = 1;
+ }
+
+ /**
+ * Returns checksum value.
+ */
+ public long getValue() {
+ return (long)adler & 0xffffffffL;
+ }
+
+ private native static int update(int adler, int b);
+ private native static int updateBytes(int adler, byte[] b, int off,
+ int len);
+}