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

The legacy PureJavaCrc32C implemented in HADOOP-7443 is much slower than JDK native implementation in modern JDKs, HADOOP-19839 rewrites it to delegate to JDK native CRC32C.

See Also:

• CRC32C

Constructor Summary

Constructors

Constructor	Description
PureJavaCrc32C()

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

Methods inherited from class java.lang.Object

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

Constructor Details

PureJavaCrc32C

public PureJavaCrc32C()

Method Details

update

public void update(int b)

Specified by:

update in interface Checksum

update

public void update(byte[] b)

Specified by:

update in interface Checksum

update

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

Specified by:

update in interface Checksum

update

public void update(ByteBuffer buffer)

Specified by:

update in interface Checksum

getValue

public long getValue()

Specified by:

getValue in interface Checksum

reset

public void reset()

Specified by:

reset 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