java.util.zip
Class CRC32

java.lang.Object
  java.util.zip.CRC32

All Implemented Interfaces:

Checksum

public class CRC32
extends Object
implements Checksum

The CRC32 class is used to compute a CRC32 Checksum from a set of data.

Field Summary

(package private) long

tbytes

Constructor Summary

CRC32()

Method Summary

long	getValue() Returns the CRC32 Checksum for all input received.
void	reset() Returns the CRC32 checksum to it initial state.
void	update(byte[] buf) Updates this Checksum with the bytes contained in buffer buf.
void	update(byte[] buf, int off, int nbytes) Updates this Checksum with nbytes of data from buffer buf, starting at offset off.
void	update(int val) Updates this Checksum with value val

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

tbytes

long tbytes

Constructor Detail

CRC32

public CRC32()

Method Detail

getValue

public long getValue()

Returns the CRC32 Checksum for all input received.

Specified by:

getValue in interface Checksum

Returns:

The checksum for this instance

reset

public void reset()

Returns the CRC32 checksum to it initial state.

Specified by:

reset in interface Checksum

update

public void update(int val)

Updates this Checksum with value val

Specified by:

update in interface Checksum

update

public void update(byte[] buf)

Updates this Checksum with the bytes contained in buffer buf.

Parameters:

buf - Buffer to update Checksum

update

public void update(byte[] buf,
                   int off,
                   int nbytes)

Updates this Checksum with nbytes of data from buffer buf, starting at offset off.

Specified by:

update in interface Checksum

Parameters:

buf - Buffer to update Checksum

off - Offset in buf to obtain data from

nbytes - Number of bytes to read from buf