1. /*

  2.  * @(#)Checksum.java	1.13 00/02/02

  3.  *

  4.  * Copyright 1996-2000 Sun Microsystems, Inc. All Rights Reserved.

  5.  * 

  6.  * This software is the proprietary information of Sun Microsystems, Inc.  

  7.  * Use is subject to license terms.

  8.  * 

  9.  */

  10. 

  11. package java.util.zip;

  12. 

  13. /**

  14.  * An interface representing a data checksum.

  15.  *

  16.  * @version 	1.13, 02/02/00

  17.  * @author 	David Connelly

  18.  */

  19. public

  20. interface Checksum {

  21.     /**

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

  23.      *

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

  25.      */

  26.     public void update(int b);

  27. 

  28.     /**

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

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

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

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

  33.      */

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

  35. 

  36.     /**

  37.      * Returns the current checksum value.

  38.      * @return the current checksum value

  39.      */

  40.     public long getValue();

  41. 

  42.     /**

  43.      * Resets the checksum to its initial value.

  44.      */

  45.     public void reset();

  46. }