1. /*

  2.  * @(#)Checksum.java	1.15 03/01/23

  3.  *

  4.  * Copyright 2003 Sun Microsystems, Inc. All rights reserved.

  5.  * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.

  6.  */

  7. 

  8. package java.util.zip;

  9. 

  10. /**

  11.  * An interface representing a data checksum.

  12.  *

  13.  * @version 	1.15, 01/23/03

  14.  * @author 	David Connelly

  15.  */

  16. public

  17. interface Checksum {

  18.     /**

  19.      * Updates the current checksum with the specified byte.

  20.      *

  21.      * @param b the byte to update the checksum with

  22.      */

  23.     public void update(int b);

  24. 

  25.     /**

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

  27.      * @param b the byte array to update the checksum with

  28.      * @param off the start offset of the data

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

  30.      */

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

  32. 

  33.     /**

  34.      * Returns the current checksum value.

  35.      * @return the current checksum value

  36.      */

  37.     public long getValue();

  38. 

  39.     /**

  40.      * Resets the checksum to its initial value.

  41.      */

  42.     public void reset();

  43. }