java.util.zip

Class CRC32

java.lang.Object

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.

Version:

1.25, 05/03/00

Author:

David Connelly

See Also:

Checksum

Constructor Summary

Constructors

Constructor and Description
CRC32() Creates a new CRC32 object.

Method Summary

Methods

Modifier and Type	Method and Description
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