io.netty.handler.codec.compression

Class Crc32c

java.lang.Object

io.netty.handler.codec.compression.Crc32c

All Implemented Interfaces:

java.util.zip.Checksum

class Crc32c
extends java.lang.Object
implements java.util.zip.Checksum

Implements CRC32-C as defined in: "Optimization of Cyclic Redundancy-CHeck Codes with 24 and 32 Parity Bits", IEEE Transactions on Communications 41(6): 883-892 (1993). The implementation of this class has been sourced from the Appendix of RFC 3309, but with masking due to Java not being able to support unsigned types.

Field Summary

Fields

Modifier and Type	Field and Description
private static int	BYTE_MASK
private int	crc
private static int[]	CRC_TABLE
private static long	LONG_MASK

Constructor Summary

Constructors

Constructor and Description
Crc32c()

Method Summary

Modifier and Type	Method and Description
private static int	crc32c(int crc, int b)
long	getValue()
void	reset()
void	update(byte[] buffer, int offset, int length)
void	update(int b)

Methods inherited from class java.lang.Object

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

Field Detail

CRC_TABLE

private static final int[] CRC_TABLE

LONG_MASK

private static final long LONG_MASK

See Also:

Constant Field Values

BYTE_MASK

private static final int BYTE_MASK

See Also:

Constant Field Values

crc

private int crc

Constructor Detail

Crc32c

Crc32c()

Method Detail

update

public void update(int b)

Specified by:

update in interface java.util.zip.Checksum

update

public void update(byte[] buffer,
                   int offset,
                   int length)

Specified by:

update in interface java.util.zip.Checksum

getValue

public long getValue()

Specified by:

getValue in interface java.util.zip.Checksum

reset

public void reset()

Specified by:

reset in interface java.util.zip.Checksum

crc32c

private static int crc32c(int crc,
                          int b)