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ClassLib.Common.java.util.zip
Class CRC32  

java.lang.Object
  ClassLib.Common.java.util.zip.CRC32

All Implemented Interfaces:

java.util.zip.Checksum

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public abstract class CRC32

extends java.lang.Object

implements java.util.zip.Checksum

CRC32

Version:

$Id: CRC32.java,v 1.4 2003/05/12 10:04:53 joewhaley Exp $

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Field Summary
private  int	crc           The crc data checksum so far.
private static int[]	crc_table           The fast CRC table.

 

Constructor Summary

CRC32()

 

Method Summary
long	getValue()           Returns the CRC32 data checksum computed so far.
private static int[]	make_crc_table()           Make the table for a fast CRC.
void	reset()           Resets the CRC32 data checksum as if no update was ever called.
void	update(byte[] buf)           Adds the complete byte array to the data checksum.
void	update(byte[] buf, int off, int len)           Adds the byte array to the data checksum.
void	update(int bval)           Updates the checksum with the int bval.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

crc

private int crc

The crc data checksum so far.

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crc_table

private static int[] crc_table

The fast CRC table. Computed once when the CRC32 class is loaded.

Constructor Detail

CRC32

public CRC32()

Method Detail

make_crc_table

private static int[] make_crc_table()

Make the table for a fast CRC.

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getValue

public long getValue()

Returns the CRC32 data checksum computed so far.

Specified by:

getValue in interface java.util.zip.Checksum

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reset

public void reset()

Resets the CRC32 data checksum as if no update was ever called.

Specified by:

reset in interface java.util.zip.Checksum

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update

public void update(int bval)

Updates the checksum with the int bval.

Specified by:

update in interface java.util.zip.Checksum

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update

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

Adds the byte array to the data checksum.

Specified by:

update in interface java.util.zip.Checksum

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update

public void update(byte[] buf)

Adds the complete byte array to the data checksum.

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