Package totalcross.util.zip

Class CRC32

java.lang.Object

totalcross.util.zip.Checksum

totalcross.util.zip.CRC32

public class CRC32
extends Checksum

Computes CRC32 data checksum of a data stream. The actual CRC32 algorithm is described in RFC 1952 (GZIP file format specification version 4.3). Can be used to get the CRC32 over a stream if used with checked input/output streams. Changes for TotalCross:
Extends the abstract class Checksum (which was originally an interface).

Constructor Summary

Constructors

Constructor	Description
CRC32()

Method Summary

Modifier and Type	Method	Description
long	getValue()	Returns the CRC32 data checksum computed so far.
void	reset()	Resets the CRC32 data checksum as if no update was ever called.
void	update(byte[] buf)	Adds the complete byte array to the data checksum.
void	update(byte[] buf, int off, int len)	Adds the byte array to the data checksum.
void	update(int bval)	Updates the checksum with the int bval.

Methods inherited from class java.lang.Object

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

Constructor Detail

CRC32

public CRC32()

Method Detail

getValue

public long getValue()

Returns the CRC32 data checksum computed so far.

reset

public void reset()

Resets the CRC32 data checksum as if no update was ever called.

update

public void update(int bval)

Updates the checksum with the int bval.

Parameters:

bval - (the byte is taken as the lower 8 bits of bval)

update

public void update(byte[] buf,
                   int off,
                   int len)

Adds the byte array to the data checksum.

Parameters:

buf - the buffer which contains the data

off - the offset in the buffer where the data starts

len - the length of the data

update

public void update(byte[] buf)

Adds the complete byte array to the data checksum.