Class Adler32
- java.lang.Object
-
- java.util.zip.Adler32
- All Implemented Interfaces:
Checksum
public class Adler32 extends Object implements Checksum
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.
- Since:
- 1.1
Constructor Summary
Constructor | Description |
---|---|
Adler32() | Creates a new Adler32 object. |
Method Summary
Modifier and Type | Method | Description |
---|---|---|
long | getValue() | Returns the checksum value. |
void | reset() | Resets the checksum to initial value. |
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). |
void | update(ByteBuffer buffer) | Updates the checksum with the bytes from the specified buffer. |
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods declared in interface java.util.zip.Checksum
update
Constructor Detail
Adler32
public Adler32()
Creates a new Adler32 object.
Method Detail
update
public void update(int b)
Updates the checksum with the specified byte (the low eight bits of the argument b).
update
public void update(byte[] b, int off, int len)
Updates the checksum with the specified array of bytes.
- Specified by:
-
update
in interfaceChecksum
- Parameters:
-
b
- the byte array to update the checksum with -
off
- the start offset of the data -
len
- the number of bytes to use for the update - Throws:
-
ArrayIndexOutOfBoundsException
- ifoff
is negative, orlen
is negative, oroff+len
is negative or greater than the length of the arrayb
.
update
public void update(ByteBuffer buffer)
Updates the checksum with the bytes from the specified buffer. The checksum is updated with the remaining bytes in the buffer, starting at the buffer's position. Upon return, the buffer's position will be updated to its limit; its limit will not have been changed.
- Specified by:
-
update
in interfaceChecksum
- Parameters:
-
buffer
- the ByteBuffer to update the checksum with - Since:
- 1.8
reset
public void reset()
Resets the checksum to initial value.
getValue
public long getValue()
Returns the checksum value.