java.util.zip

Class CRC32

java.lang.Object

java.util.zip.CRC32

All Implemented Interfaces:

Checksum

public class CRC32
extends Object
implements Checksum

The CRC32 class is used to compute a CRC32 checksum from data provided as input value. See also Adler32 which is almost as good, but cheaper.

Constructor Summary

Constructors

Constructor and Description
CRC32()

Method Summary

Modifier and Type	Method and Description
long	getValue() Returns the CRC32 checksum for all input received.
void	reset() Resets the CRC32 checksum to it initial state.
void	update(byte[] buf) Updates this checksum with the bytes contained in buffer buf.
void	update(byte[] buf, int offset, int byteCount) Update this CRC32 checksum with the contents of buf, starting from offset and reading byteCount bytes of data.
void	update(int val) Updates this checksum with the byte value provided as integer.

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 checksum for all input received.

Specified by:

getValue in interface Checksum

Returns:

The checksum for this instance.

reset

public void reset()

Resets the CRC32 checksum to it initial state.

Specified by:

reset in interface Checksum

update

public void update(int val)

Updates this checksum with the byte value provided as integer.

Specified by:

update in interface Checksum

Parameters:

val - represents the byte to update the checksum.

update

public void update(byte[] buf)

Updates this checksum with the bytes contained in buffer buf.

Parameters:

buf - the buffer holding the data to update the checksum with.

update

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

Update this CRC32 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.