net.rim.device.api.util
Class CRC16

java.lang.Object
  |
  +--net.rim.device.api.util.CRC16

public final class CRC16

extends Object

Computes the 16-bit CRC (checksum) for a data stream.

Based on FCS-16 specified in RFC 1662 (STD 51).

Field Summary

static int

INITIAL_VALUE Initial checksum value used before updates.

Method Summary

static int	update(int crc, byte[] b) Updates the checksum with the specified array of bytes.
static int	update(int crc, byte[] b, int offset, int length) Updates the checksum with a section of provided array of bytes.
static int	update(int crc, int b) Updates the checksum with the specified byte.

Methods inherited from class java.lang.Object

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

Field Detail

INITIAL_VALUE

public static final int INITIAL_VALUE

Initial checksum value used before updates.

Method Detail

update

public static int update(int crc,
                         int b)

Updates the checksum with the specified byte.

Parameters:

crc - Checksum to update.

b - Byte with which to update the checksum.

Returns:

Resulting checksum value.

Since:

JDE 3.6

update

public static int update(int crc,
                         byte[] b)

Updates the checksum with the specified array of bytes.

Parameters:

crc - Checksum to update.

b - Byte array with which to update the checksum.

Returns:

Resulting checksum value.

Since:

JDE 3.6

update

public static int update(int crc,
                         byte[] b,
                         int offset,
                         int length)

Updates the checksum with a section of provided array of bytes.

Parameters:

crc - Checksum to update.

b - Byte array containing the section with which to update the checksum.

off - First element in the byte array used to update the checksum.

len - Number of bytes in the section used to update the checksum.

Returns:

Resulting checksum value.

Since:

JDE 3.6