--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.base/share/classes/java/util/zip/CheckedInputStream.java	Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 1996, 2006, 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.io.FilterInputStream;
+import java.io.InputStream;
+import java.io.IOException;
+
+/**
+ * An input stream that also maintains a checksum of the data being read.
+ * The checksum can then be used to verify the integrity of the input data.
+ *
+ * @see         Checksum
+ * @author      David Connelly
+ */
+public
+class CheckedInputStream extends FilterInputStream {
+    private Checksum cksum;
+
+    /**
+     * Creates an input stream using the specified Checksum.
+     * @param in the input stream
+     * @param cksum the Checksum
+     */
+    public CheckedInputStream(InputStream in, Checksum cksum) {
+        super(in);
+        this.cksum = cksum;
+    }
+
+    /**
+     * Reads a byte. Will block if no input is available.
+     * @return the byte read, or -1 if the end of the stream is reached.
+     * @exception IOException if an I/O error has occurred
+     */
+    public int read() throws IOException {
+        int b = in.read();
+        if (b != -1) {
+            cksum.update(b);
+        }
+        return b;
+    }
+
+    /**
+     * Reads into an array of bytes. If <code>len</code> is not zero, the method
+     * blocks until some input is available; otherwise, no
+     * bytes are read and <code>0</code> is returned.
+     * @param buf the buffer into which the data is read
+     * @param off the start offset in the destination array <code>b</code>
+     * @param len the maximum number of bytes read
+     * @return    the actual number of bytes read, or -1 if the end
+     *            of the stream is reached.
+     * @exception  NullPointerException If <code>buf</code> is <code>null</code>.
+     * @exception  IndexOutOfBoundsException If <code>off</code> is negative,
+     * <code>len</code> is negative, or <code>len</code> is greater than
+     * <code>buf.length - off</code>
+     * @exception IOException if an I/O error has occurred
+     */
+    public int read(byte[] buf, int off, int len) throws IOException {
+        len = in.read(buf, off, len);
+        if (len != -1) {
+            cksum.update(buf, off, len);
+        }
+        return len;
+    }
+
+    /**
+     * Skips specified number of bytes of input.
+     * @param n the number of bytes to skip
+     * @return the actual number of bytes skipped
+     * @exception IOException if an I/O error has occurred
+     */
+    public long skip(long n) throws IOException {
+        byte[] buf = new byte[512];
+        long total = 0;
+        while (total < n) {
+            long len = n - total;
+            len = read(buf, 0, len < buf.length ? (int)len : buf.length);
+            if (len == -1) {
+                return total;
+            }
+            total += len;
+        }
+        return total;
+    }
+
+    /**
+     * Returns the Checksum for this input stream.
+     * @return the Checksum value
+     */
+    public Checksum getChecksum() {
+        return cksum;
+    }
+}