CRC32

java.lang.Object
- net.sf.jazzlib.CRC32

All Implemented Interfaces:

Checksum
```
public class CRC32
extends java.lang.Object
implements Checksum
```
Computes CRC32 data checksum of a data stream. The actual CRC32 algorithm is described in RFC 1952 (GZIP file format specification version 4.3). Can be used to get the CRC32 over a stream if used with checked input/output streams.

See Also:

InflaterInputStream, DeflaterOutputStream

Field Summary

Fields
Modifier and Type Field Description

private int crc
The crc data checksum so far.

private static int[] crc_table
The fast CRC table.

Constructor Summary

Constructors
Constructor Description

CRC32()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`long`	`getValue()`	Returns the CRC32 data checksum computed so far.
`private static int[]`	`make_crc_table()`	Make the table for a fast CRC.
`void`	`reset()`	Resets the CRC32 data checksum as if no update was ever called.
`void`	`update(byte[] buf)`	Adds the complete byte array to the data checksum.
`void`	`update(byte[] buf, int off, int len)`	Adds the byte array to the data checksum.
`void`	`update(int bval)`	Updates the checksum with the int bval.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - crc
```
private int crc
```
    The crc data checksum so far.
  - crc_table
```
private static int[] crc_table
```
    The fast CRC table. Computed once when the CRC32 class is loaded.
- Constructor Detail
  - CRC32
```
public CRC32()
```
- Method Detail
  - make_crc_table
```
private static int[] make_crc_table()
```
    Make the table for a fast CRC.
  - getValue
```
public long getValue()
```
    Returns the CRC32 data checksum computed so far.
    
    Specified by:
    
    getValue in interface Checksum
  - reset
```
public void reset()
```
    Resets the CRC32 data checksum as if no update was ever called.
    
    Specified by:
    
    reset in interface Checksum
  - update
```
public void update(int bval)
```
    Updates the checksum with the int bval.
    
    Specified by:
    
    update in interface Checksum
    
    Parameters:
    
    bval - (the byte is taken as the lower 8 bits of bval)
  - update
```
public void update(byte[] buf,
                   int off,
                   int len)
```
    Adds the byte array to the data checksum.
    
    Specified by:
    
    update in interface Checksum
    
    Parameters:
    
    buf - the buffer which contains the data
    
    off - the offset in the buffer where the data starts
    
    len - the length of the data
  - update
```
public void update(byte[] buf)
```
    Adds the complete byte array to the data checksum.