de.uniks.networkparser.bytes

Class CRC

java.lang.Object

de.uniks.networkparser.bytes.Checksum

de.uniks.networkparser.bytes.CRC

public class CRC
extends Checksum

Field Summary

Fields

Modifier and Type	Field and Description
static int	CCITT16
protected int[]	crc_table The fast CRC table.
static int	CRC16
static int	CRC32
static int	CRC8

Fields inherited from class de.uniks.networkparser.bytes.Checksum

length, value

Constructor Summary

Constructors

Constructor and Description
CRC()
CRC(int bitMask)

Method Summary

Modifier and Type	Method and Description
int[]	getGenTable(boolean isReflect, int polynom) Make the table for a fast CRC.
int	getOrder()
boolean	update(int data) Update the CRC value with a byte data.
CRC	withCRC(int bitMask)

Methods inherited from class de.uniks.networkparser.bytes.Checksum

getByteArray, getLength, getValue, reset, update, update, update

Methods inherited from class java.lang.Object

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

Field Detail

CRC8

public static final int CRC8

See Also:

Constant Field Values

CRC16

public static final int CRC16

See Also:

Constant Field Values

CRC32

public static final int CRC32

See Also:

Constant Field Values

CCITT16

public static final int CCITT16

See Also:

Constant Field Values

crc_table

protected int[] crc_table

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

Constructor Detail

CRC

public CRC()

CRC

public CRC(int bitMask)

Method Detail

withCRC

public CRC withCRC(int bitMask)

update

public boolean update(int data)

Update the CRC value with a byte data.

Overrides:

update in class Checksum

Parameters:

data - The byte data

Returns:

success to add the new Value

getOrder

public int getOrder()

Specified by:

getOrder in class Checksum

Returns:

the Orderindex

getGenTable

public int[] getGenTable(boolean isReflect,
                         int polynom)

Make the table for a fast CRC.

Parameters:

isReflect - is Reflects the lower bits of the value provided

polynom - the generator polynom

Returns:

the GenTable