Java™ Platform
Standard Ed. 6

java.util.zip
Class CRC32

java.lang.Object
  extended by java.util.zip.CRC32
All Implemented Interfaces:
Checksum

public class CRC32
extends Object
implements Checksum

A class that can be used to compute the CRC-32 of a data stream.

See Also:
Checksum

Constructor Summary
CRC32()
          Creates a new CRC32 object.
 
Method Summary
 long getValue()
          Returns CRC-32 value.
 void reset()
          Resets CRC-32 to initial value.
 void update(byte[] b)
          Updates checksum with specified array of bytes.
 void update(byte[] b, int off, int len)
          Updates CRC-32 with specified array of bytes.
 void update(int b)
          Updates CRC-32 with specified byte.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

CRC32

public CRC32()
Creates a new CRC32 object.

Method Detail

update

public void update(int b)
Updates CRC-32 with specified byte.

Specified by:
update in interface Checksum
Parameters:
b - the byte to update the checksum with

update

public void update(byte[] b,
                   int off,
                   int len)
Updates CRC-32 with specified array of bytes.

Specified by:
update in interface Checksum
Parameters:
b - the byte array to update the checksum with
off - the start offset of the data
len - the number of bytes to use for the update

update

public void update(byte[] b)
Updates checksum with specified array of bytes.

Parameters:
b - the array of bytes to update the checksum with

reset

public void reset()
Resets CRC-32 to initial value.

Specified by:
reset in interface Checksum

getValue

public long getValue()
Returns CRC-32 value.

Specified by:
getValue in interface Checksum
Returns:
the current checksum value

Java™ Platform
Standard Ed. 6

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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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