java.util.zip

Class Adler32

java.lang.Object

java.util.zip.Adler32

All Implemented Interfaces:

Checksum

public class Adler32
extends Object
implements Checksum

The Adler-32 class is used to compute the Adler32 checksum from a set of data. Compared to CRC32 it trades reliability for speed. Refer to RFC 1950 for the specification.

Constructor Summary

Constructors

Constructor and Description
Adler32()

Method Summary

Modifier and Type	Method and Description
long	getValue() Returns the Adler32 checksum for all input received.
void	reset() Reset this instance to its initial checksum.
void	update(byte[] buf) Update this Adler32 checksum using the contents of buf.
void	update(byte[] buf, int offset, int byteCount) Update this Adler32 checksum with the contents of buf, starting from offset and reading byteCount bytes of data.
void	update(int i) Update this Adler32 checksum with the single byte provided as argument.

Methods inherited from class java.lang.Object

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

Constructor Detail

Adler32

public Adler32()

Method Detail

getValue

public long getValue()

Returns the Adler32 checksum for all input received.

Specified by:

getValue in interface Checksum

Returns:

The checksum for this instance.

reset

public void reset()

Reset this instance to its initial checksum.

Specified by:

reset in interface Checksum

update

public void update(int i)

Update this Adler32 checksum with the single byte provided as argument.

Specified by:

update in interface Checksum

Parameters:

i - the byte to update checksum with.

update

public void update(byte[] buf)

Update this Adler32 checksum using the contents of buf.

Parameters:

buf - bytes to update checksum with.

update

public void update(byte[] buf,
                   int offset,
                   int byteCount)

Update this Adler32 checksum with the contents of buf, starting from offset and reading byteCount bytes of data.

Specified by:

update in interface Checksum

Parameters:

buf - the byte array from which to read the bytes.

offset - the initial position in buf to read the bytes from.

byteCount - the number of bytes to read from buf.