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diff --git a/libjava/classpath/java/util/zip/Checksum.java b/libjava/classpath/java/util/zip/Checksum.java
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+/* Checksum.java - Interface to compute a data checksum
+   Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package java.util.zip;
+
+/*
+ * Written using on-line Java Platform 1.2 API Specification, as well
+ * as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998).
+ * Status:  Believed complete and correct.
+ */
+
+/**
+ * Interface to compute a data checksum used by checked input/output streams.
+ * A data checksum can be updated by one byte or with a byte array. After each
+ * update the value of the current checksum can be returned by calling
+ * <code>getValue</code>. The complete checksum object can also be reset
+ * so it can be used again with new data.
+ *
+ * @see CheckedInputStream
+ * @see CheckedOutputStream
+ *
+ * @author Per Bothner
+ * @author Jochen Hoenicke
+ */
+public interface Checksum
+{
+  /**
+   * Returns the data checksum computed so far.
+   */
+  long getValue();
+
+  /**
+   * Resets the data checksum as if no update was ever called.
+   */
+  void reset();
+
+  /**
+   * Adds one byte to the data checksum.
+   *
+   * @param bval the data value to add. The high byte of the int is ignored.
+   */
+  void update (int bval);
+
+  /**
+   * Adds the byte array to the data checksum.
+   *
+   * @param buf the buffer which contains the data
+   * @param off the offset in the buffer where the data starts
+   * @param len the length of the data
+   */
+  void update (byte[] buf, int off, int len);
+}