Package org.biojava.nbio.core.util

Class CRC64Checksum

java.lang.Object

org.biojava.nbio.core.util.CRC64Checksum

All Implemented Interfaces:

Checksum

public class CRC64Checksum
extends Object
implements Checksum

Utility class that calculates a CRC64 checksum on a stream of bytes. Code was based on some from BioPerl. Note that we use longs then cast them to avoid the lack of an unsigned int in Java. Longs are 64-bit but we are only using the bottom 32 bits. An int is 32-bit but encodes sign so we can get amusing results if we don't allow for this.

Author:

Unknown. Copied from Expasy4J for convenience. See http://dev.isb-sib.ch/projects/expasy4j/

Constructor Summary

Constructors

Constructor	Description
CRC64Checksum()

Method Summary

Modifier and Type	Method	Description
long	getValue()
void	reset()
String	toString()	Returns a zero-padded 16 character wide string containing the current value of this checksum in uppercase hexadecimal format.
void	update(byte[] b, int offset, int length)	Updates the CRC-64 checksum with the specified array of bytes.
void	update(int b)
void	update(String s)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.zip.Checksum

update, update

Constructor Details

CRC64Checksum

public CRC64Checksum()

Method Details

update

public void update(int b)

Specified by:

update in interface Checksum

update

public void update(byte[] b,
 int offset,
 int length)

Updates the CRC-64 checksum with the specified array of bytes.
Note that BioJava before version 6.0 implemented this method incorrectly, using length as an index.

Specified by:

update in interface Checksum

Throws:

IllegalArgumentException - if offset is negative, or length is negative, or offset+length is negative or greater than the length of the array b.

update

public void update(String s)

getValue

public long getValue()

Specified by:

getValue in interface Checksum

toString

public String toString()

Returns a zero-padded 16 character wide string containing the current value of this checksum in uppercase hexadecimal format.

Overrides:

toString in class Object

reset

public void reset()

Specified by:

reset in interface Checksum