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Adler32

public class Adler32
extends Object implements Checksum

java.lang.Object
   ↳ java.util.zip.Adler32


A class that can be used to compute the Adler-32 checksum of a data stream. An Adler-32 checksum is almost as reliable as a CRC-32 but can be computed much faster.

Passing a null argument to a method in this class will cause a NullPointerException to be thrown.

See also:

Summary

Public constructors

Adler32()

Creates a new Adler32 object.

Public methods

long getValue()

Returns the checksum value.

void reset()

Resets the checksum to initial value.

void update(byte[] b)

Updates the checksum with the specified array of bytes.

void update(ByteBuffer buffer)

Updates the checksum with the bytes from the specified buffer.

void update(byte[] b, int off, int len)

Updates the checksum with the specified array of bytes.

void update(int b)

Updates the checksum with the specified byte (the low eight bits of the argument b).

Inherited methods

From class java.lang.Object
From interface java.util.zip.Checksum

Public constructors

Adler32

added in API level 1
Adler32 ()

Creates a new Adler32 object.

Public methods

getValue

added in API level 1
long getValue ()

Returns the checksum value.

Returns
long the current checksum value

reset

added in API level 1
void reset ()

Resets the checksum to initial value.

update

added in API level 1
void update (byte[] b)

Updates the checksum with the specified array of bytes.

Parameters
b byte: the byte array to update the checksum with

update

void update (ByteBuffer buffer)

Updates the checksum with the bytes from the specified buffer. The checksum is updated using buffer.remaining() bytes starting at buffer.position() Upon return, the buffer's position will be updated to its limit; its limit will not have been changed.

Parameters
buffer ByteBuffer: the ByteBuffer to update the checksum with

update

added in API level 1
void update (byte[] b, 
                int off, 
                int len)

Updates the checksum with the specified array of bytes.

Parameters
b byte: the byte array to update the checksum with
off int: the start offset of the data
len int: the number of bytes to use for the update
Throws
ArrayIndexOutOfBoundsException if off is negative, or len is negative, or off+len is greater than the length of the array b

update

added in API level 1
void update (int b)

Updates the checksum with the specified byte (the low eight bits of the argument b).

Parameters
b int: the byte to update the checksum with
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