java.util.zip

Class CRC32

public class CRC32 extends Object implements 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.

See Also: InflaterInputStream

UNKNOWN: April 1, 1999.

Method Summary
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(int bval) Updates the checksum with the int bval.
void	update(byte[] buf, int off, int len) Adds the byte array to the data checksum.
void	update(byte[] buf) Adds the complete byte array to the data checksum.

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.