net.rim.device.api.util
Class CRC24

java.lang.Object
  extended by net.rim.device.api.util.CRC24

public final class CRC24
extends Object

A class that can be used to compute a 24-bit CRC of a data stream.

Based on CRC-24 specified in RFC 2440.

Note: The byte ordering of the resulting checksum value depends on the protocol in which the CRC is used. The ordering used in a specified protocol might be different from the ordering used in this implementation. The output of this implementation can be reversed when used with such a protocol.


Field Summary
static int INITIAL_VALUE
          
 
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 current checksum with the specified 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

See Also:
Constant Field Values


Method Detail

update

public static int update(int crc,
                         int b)
Updates the checksum with the specified byte.

Parameters:
crc - The checksum to update.
b - The byte to update the checksum with.
Returns:
The current checksum value.

update

public static int update(int crc,
                         byte[] b)
Updates the checksum with the specified array of bytes.

Parameters:
crc - The checksum to update.
b - The byte array to update the checksum with.
Returns:
The current checksum value.

update

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

Parameters:
crc - The checksum to update.
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.
Returns:
The current checksum value.





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