Module java.base

Package java.util.zip

Class CRC32C

java.lang.Object

java.util.zip.CRC32C

All Implemented Interfaces:

Checksum

public final class CRC32C
extends Object
implements Checksum

A class that can be used to compute the CRC-32C of a data stream.

CRC-32C is defined in RFC 3720: Internet Small Computer Systems Interface (iSCSI).

Passing a null argument to a method in this class will cause a NullPointerException to be thrown.

Since:

9

External Specifications

• RFC 3720: Internet Small Computer Systems Interface (iSCSI)

Constructor Summary

Constructors

Constructor	Description
CRC32C()	Creates a new CRC32C object.

Method Summary

Modifier and Type	Method	Description
long	getValue()	Returns CRC-32C value.
void	reset()	Resets CRC-32C to initial value.
void	update(byte[] b, int off, int len)	Updates the CRC-32C checksum with the specified array of bytes.
void	update(int b)	Updates the CRC-32C checksum with the specified byte (the low eight bits of the argument b).
void	update(ByteBuffer buffer)	Updates the CRC-32C checksum with the bytes from the specified buffer.

Methods declared in class java.lang.Object

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

Methods declared in interface java.util.zip.Checksum

update

Constructor Details

CRC32C

public CRC32C()

Creates a new CRC32C object.

Method Details

update

public void update(int b)

Updates the CRC-32C checksum with the specified byte (the low eight bits of the argument b).

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 the CRC-32C checksum with the 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

Throws:

ArrayIndexOutOfBoundsException - if off is negative, or len is negative, or off+len is negative or greater than the length of the array b.

update

public void update(ByteBuffer buffer)

Updates the CRC-32C checksum with the bytes from the specified buffer. The checksum is updated with the remaining bytes in the buffer, starting at the buffer's position. Upon return, the buffer's position will be updated to its limit; its limit will not have been changed.

Specified by:

update in interface Checksum

Parameters:

buffer - the ByteBuffer to update the checksum with

reset

public void reset()

Resets CRC-32C to initial value.

Specified by:

reset in interface Checksum

getValue

public long getValue()

Returns CRC-32C value.

Specified by:

getValue in interface Checksum

Returns:

the current checksum value