org.bolet.jgz
Class Adler32

java.lang.Object
  org.bolet.jgz.Adler32

public final class Adler32
extends java.lang.Object

This class can be used to compute Adler-32 checksums (specified in RFC 1950 and used in zlib streams).

Constructor Summary

Adler32()
Create the checksum engine with the standard initial state.

Method Summary

int	getSum() Get the current checksum value.
void	init() Reset the engine to the standard initial state.
void	init(int val) Set the current checksum value.
void	update(byte[] buf) Update the cheksum with the provided input bytes.
void	update(byte[] buf, int off, int len) Update the cheksum with the provided input bytes.
void	update(int v) Update the cheksum with the provided input byte.

Methods inherited from class java.lang.Object

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

Constructor Detail

Adler32

public Adler32()

Create the checksum engine with the standard initial state.

Method Detail

init

public void init()

Reset the engine to the standard initial state.

init

public void init(int val)

Set the current checksum value.

Parameters:

val - the new checksum state

update

public void update(int v)

Update the cheksum with the provided input byte.

Parameters:

v - the input byte (between 0 and 255)

update

public void update(byte[] buf)

Update the cheksum with the provided input bytes.

Parameters:

buf - the data buffer

update

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

Update the cheksum with the provided input bytes.

Parameters:

buf - the data buffer

off - the data offset

len - the data length (in bytes)

getSum

public int getSum()

Get the current checksum value. This does not invalidate the state.

Returns:

the current checksum