Package org.apache.hadoop.util

Class PureJavaCrc32C

java.lang.Object

org.apache.hadoop.util.PureJavaCrc32C

All Implemented Interfaces:

Checksum

@Public
@Stable
public class PureJavaCrc32C
extends Object
implements Checksum

A pure-java implementation of the CRC32 checksum that uses the CRC32-C polynomial, the same polynomial used by iSCSI and implemented on many Intel chipsets supporting SSE4.2.

Constructor Summary

Constructors

Constructor	Description
PureJavaCrc32C()	Create a new PureJavaCrc32 object.

Method Summary

Modifier and Type	Method	Description
long	getValue()
static int	mod(long x)	Compute x mod p, where p is the CRC32C polynomial.
void	reset()
void	update(byte[] b, int off, int len)
final void	update(int b)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.zip.Checksum

update, update

Constructor Details

PureJavaCrc32C

public PureJavaCrc32C()

Create a new PureJavaCrc32 object.

Method Details

getValue

public long getValue()

Specified by:

getValue in interface Checksum

reset

public void reset()

Specified by:

reset in interface Checksum

update

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

Specified by:

update in interface Checksum

mod

public static int mod(long x)

Compute x mod p, where p is the CRC32C polynomial.

Parameters:

x - the input value

Returns:

x mod p

update

public final void update(int b)

Specified by:

update in interface Checksum