net.anidb.checksum
Class Checksum

java.lang.Object
  net.anidb.checksum.Checksum

Direct Known Subclasses:

Crc32Checksum, Ed2kChecksum, Md4Checksum, Md5Checksum, Sha160Checksum, TigerChecksum, TigerTreeChecksum

public abstract class Checksum
extends java.lang.Object

The super class of all checksum / hash classes.

Version:

1.0, 03.01.2010

Author:

grizzlyxp (http://anidb.net/perl-bin/animedb.pl?show=userpage&uid=63935)

Constructor Summary

Checksum()
Creates a checksum object.

Method Summary

abstract byte[]	getDigest() Builds and returns the digest.
java.lang.String	getHexDigest() Calls getDigest() and returns the digest into a hex format.
abstract void	reset() Resets the checksum object.
abstract void	update(byte[] buf, int off, int len) Updates the checksum with data.
abstract void	update(int data) Updates the checksum with data.

Methods inherited from class java.lang.Object

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

Constructor Detail

Checksum

public Checksum()

Creates a checksum object.

Method Detail

getDigest

public abstract byte[] getDigest()

Builds and returns the digest.

After calling this method you have to use reset().

Returns:

The digest.

See Also:

reset(), getHexDigest()

getHexDigest

public java.lang.String getHexDigest()

Calls getDigest() and returns the digest into a hex format.

Returns:

The digest in hexdecimal presentation.

See Also:

getDigest()

reset

public abstract void reset()

Resets the checksum object.

update

public abstract void update(byte[] buf,
                            int off,
                            int len)

Updates the checksum with data.

Parameters:

buf - The data buffer.

off - The offset.

len - The length.

Throws:

java.lang.IllegalArgumentException - If the data buffer is null.

java.lang.IllegalArgumentException - If the offset is less than 0.

java.lang.IllegalArgumentException - If the length is less than 1.

java.lang.IllegalArgumentException - If the offset + the length is greater than the length of the data buffer.

update

public abstract void update(int data)

Updates the checksum with data.

Parameters:

data - The data.