org.rdfhdt.hdt.util.crc

Class CRC32

java.lang.Object

org.rdfhdt.hdt.util.crc.CRC32

All Implemented Interfaces:

Comparable<CRC>, CRC

public class CRC32
extends Object
implements CRC

Implementation of CRC32-C Algorithm. Width = 32 Poly = 0x1edc6f41 XorIn = 0xffffffff ReflectIn = True XorOut = 0xffffffff ReflectOut = True

Author:

mario.arias

Constructor Summary

Constructors

Constructor and Description
CRC32()

Method Summary

Modifier and Type	Method and Description
int	compareTo(CRC o)
long	getValue() Get checksum value.
boolean	readAndCheck(InputStream in) Read CRC from InputStream and compare it to this.
void	reset() Reset the checksum to the initial value.
String	toString()
void	update(byte data) Update the CRC with the specified byte
void	update(byte[] buffer, int offset, int length) Update this CRC with the content of the buffer, from offset, using length bytes.
void	writeCRC(OutputStream out) Write this CRC to an Output Stream

Methods inherited from class java.lang.Object

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

Constructor Detail

CRC32

public CRC32()

Method Detail

update

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

Description copied from interface: CRC

Update this CRC with the content of the buffer, from offset, using length bytes.

Specified by:

update in interface CRC

update

public void update(byte data)

Description copied from interface: CRC

Update the CRC with the specified byte

Specified by:

update in interface CRC

writeCRC

public void writeCRC(OutputStream out)
              throws IOException

Description copied from interface: CRC

Write this CRC to an Output Stream

Specified by:

writeCRC in interface CRC

Throws:

IOException

readAndCheck

public boolean readAndCheck(InputStream in)
                     throws IOException

Description copied from interface: CRC

Read CRC from InputStream and compare it to this.

Specified by:

readAndCheck in interface CRC

Parameters:

in - InputStream

Returns:

true if the checksum is the same, false if checksum error.

Throws:

IOException

getValue

public long getValue()

Description copied from interface: CRC

Get checksum value.

Specified by:

getValue in interface CRC

Returns:

reset

public void reset()

Description copied from interface: CRC

Reset the checksum to the initial value.

Specified by:

reset in interface CRC

compareTo

public int compareTo(CRC o)

Specified by:

compareTo in interface Comparable<CRC>

toString

public String toString()

Overrides:

toString in class Object