1 /*

     2  * Copyright 1996-1999 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package java.util.zip;

    27 

    28 /**

    29  * An interface representing a data checksum.

    30  *

    31  * @author      David Connelly

    32  */

    33 public

    34 interface Checksum {

    35     /**

    36      * Updates the current checksum with the specified byte.

    37      *

    38      * @param b the byte to update the checksum with

    39      */

    40     public void update(int b);

    41 

    42     /**

    43      * Updates the current checksum with the specified array of bytes.

    44      * @param b the byte array to update the checksum with

    45      * @param off the start offset of the data

    46      * @param len the number of bytes to use for the update

    47      */

    48     public void update(byte[] b, int off, int len);

    49 

    50     /**

    51      * Returns the current checksum value.

    52      * @return the current checksum value

    53      */

    54     public long getValue();

    55 

    56     /**

    57      * Resets the checksum to its initial value.

    58      */

    59     public void reset();

    60 }