Package com.dalsemi.onewire.utils

Class CRC16

java.lang.Object

com.dalsemi.onewire.utils.CRC16

public class CRC16
extends java.lang.Object

CRC16 is a class containing an implementation of the Cyclic-Redundency-Check (CRC) CRC16. The CRC16 is used in iButton memory packet structure.

CRC16 is based on the polynomial = X^16 + X^15 + X^2 + 1.

Method Summary

Modifier and Type	Method	Description
static int	compute(byte[] dataToCrc)	Perform the CRC16 on an array of data elements based on a zero seed.
static int	compute(byte[] dataToCrc, int seed)	Perform the CRC16 on an array of data elements based on the provided seed.
static int	compute(byte[] dataToCrc, int off, int len)	Perform the CRC16 on an array of data elements based on a zero seed.
static int	compute(byte[] dataToCrc, int off, int len, int seed)	Perform the CRC16 on an array of data elements based on the provided seed.
static int	compute(int dataToCrc)	Perform the CRC16 on the data element based on a zero seed.
static int	compute(int dataToCrc, int seed)	Perform the CRC16 on the data element based on the provided seed.

Methods inherited from class java.lang.Object

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

Method Detail

compute

public static int compute(int dataToCrc)

Perform the CRC16 on the data element based on a zero seed.

CRC16 is based on the polynomial = X^16 + X^15 + X^2 + 1.

Parameters:

dataToCrc - data element on which to perform the CRC16

Returns:

CRC16 value

compute

public static int compute(int dataToCrc,
                          int seed)

Perform the CRC16 on the data element based on the provided seed.

CRC16 is based on the polynomial = X^16 + X^15 + X^2 + 1.

Parameters:

dataToCrc - data element on which to perform the CRC16

Returns:

CRC16 value

compute

public static int compute(byte[] dataToCrc)

Perform the CRC16 on an array of data elements based on a zero seed.

CRC16 is based on the polynomial = X^16 + X^15 + X^2 + 1.

Parameters:

dataToCrc - array of data elements on which to perform the CRC16

Returns:

CRC16 value

compute

public static int compute(byte[] dataToCrc,
                          int off,
                          int len)

Perform the CRC16 on an array of data elements based on a zero seed.

CRC16 is based on the polynomial = X^16 + X^15 + X^2 + 1.

Parameters:

dataToCrc - array of data elements on which to perform the CRC16

off - offset into the data array

len - length of data to CRC16

Returns:

CRC16 value

compute

public static int compute(byte[] dataToCrc,
                          int off,
                          int len,
                          int seed)

Perform the CRC16 on an array of data elements based on the provided seed.

CRC16 is based on the polynomial = X^16 + X^15 + X^2 + 1.

Parameters:

dataToCrc - array of data elements on which to perform the CRC16

off - offset into the data array

len - length of data to CRC16

seed - seed to use for CRC16

Returns:

CRC16 value

compute

public static int compute(byte[] dataToCrc,
                          int seed)

Perform the CRC16 on an array of data elements based on the provided seed.

CRC16 is based on the polynomial = X^16 + X^15 + X^2 + 1.

Parameters:

dataToCrc - array of data elements on which to perform the CRC16

seed - seed to use for CRC16

Returns:

CRC16 value