Class CRC32
- java.lang.Object
-
- java.util.zip.CRC32
- All Implemented Interfaces:
Checksum
public class CRC32 extends Object implements Checksum
A class that can be used to compute the CRC-32 of a data stream.
Passing a null
argument to a method in this class will cause a NullPointerException
to be thrown.
- Since:
- 1.1
Constructor Summary
Constructor | Description |
---|---|
CRC32() | Creates a new CRC32 object. |
Method Summary
Modifier and Type | Method | Description |
---|---|---|
long | getValue() | Returns CRC-32 value. |
void | reset() | Resets CRC-32 to initial value. |
void | update(byte[] b,
int off,
int len) | Updates the CRC-32 checksum with the specified array of bytes. |
void | update(int b) | Updates the CRC-32 checksum with the specified byte (the low eight bits of the argument b). |
void | update(ByteBuffer buffer) | Updates the CRC-32 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
CRC32
public CRC32()
Creates a new CRC32 object.
Method Detail
update
public void update(int b)
Updates the CRC-32 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 CRC-32 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 CRC-32 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 CRC-32 to initial value.
getValue
public long getValue()
Returns CRC-32 value.