java.lang.Object
- org.apache.commons.codec.digest.XXHash32

All Implemented Interfaces:

java.util.zip.Checksum
```
public class XXHash32
extends java.lang.Object
implements java.util.zip.Checksum
```
Implementation of the xxhash32 hash algorithm.
Copied from Commons Compress 1.14 https://git-wip-us.apache.org/repos/asf?p=commons-compress.git;a=blob;f=src/main/java/org/apache/commons/compress/compressors/lz4/XXHash32.java;h=a406ffc197449be594d46f0d2712b2d4786a1e68;hb=HEAD

NotThreadSafe

Since:

1.11

See Also:

xxHash

Field Summary

Fields
Modifier and Type	Field	Description
`private static int`	`BUF_SIZE`
`private byte[]`	`buffer`
`private byte[]`	`oneByte`
`private int`	`pos`
`private static int`	`PRIME1`
`private static int`	`PRIME2`
`private static int`	`PRIME3`
`private static int`	`PRIME4`
`private static int`	`PRIME5`
`private static int`	`ROTATE_BITS`
`private int`	`seed`
`private int[]`	`state`
`private int`	`totalLen`

Constructor Summary

Constructors
Constructor Description

XXHash32()
Creates an XXHash32 instance with a seed of 0.

XXHash32(int seed)
Creates an XXHash32 instance.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`private static long`	`fromLittleEndian(byte[] bytes, int off, int length)`	Reads the given byte array as a little endian long.
`private static int`	`getInt(byte[] buffer, int idx)`
`long`	`getValue()`
`private void`	`initializeState()`
`private void`	`process(byte[] b, int offset)`
`void`	`reset()`
`void`	`update(byte[] b, int off, int len)`
`void`	`update(int b)`

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

Methods inherited from interface java.util.zip.Checksum
update, update

- Field Detail
  - BUF_SIZE
```
private static final int BUF_SIZE
```
    See Also:
    
    Constant Field Values
  - ROTATE_BITS
```
private static final int ROTATE_BITS
```
    See Also:
    
    Constant Field Values
  - PRIME1
```
private static final int PRIME1
```
    See Also:
    
    Constant Field Values
  - PRIME2
```
private static final int PRIME2
```
    See Also:
    
    Constant Field Values
  - PRIME3
```
private static final int PRIME3
```
    See Also:
    
    Constant Field Values
  - PRIME4
```
private static final int PRIME4
```
    See Also:
    
    Constant Field Values
  - PRIME5
```
private static final int PRIME5
```
    See Also:
    
    Constant Field Values
  - oneByte
```
private final byte[] oneByte
```
  - state
```
private final int[] state
```
  - buffer
```
private final byte[] buffer
```
  - seed
```
private final int seed
```
  - totalLen
```
private int totalLen
```
  - pos
```
private int pos
```
- Constructor Detail
  - XXHash32
```
public XXHash32()
```
    Creates an XXHash32 instance with a seed of 0.
  - XXHash32
```
public XXHash32(int seed)
```
    Creates an XXHash32 instance.
    
    Parameters:
    
    seed - the seed to use
- Method Detail
  - reset
```
public void reset()
```
    Specified by:
    
    reset in interface java.util.zip.Checksum
  - update
```
public void update(int b)
```
    Specified by:
    
    update in interface java.util.zip.Checksum
  - update
```
public void update(byte[] b,
                   int off,
                   int len)
```
    Specified by:
    
    update in interface java.util.zip.Checksum
  - getValue
```
public long getValue()
```
    Specified by:
    
    getValue in interface java.util.zip.Checksum
  - getInt
```
private static int getInt(byte[] buffer,
                          int idx)
```
  - initializeState
```
private void initializeState()
```
  - process
```
private void process(byte[] b,
                     int offset)
```
  - fromLittleEndian
```
private static long fromLittleEndian(byte[] bytes,
                                     int off,
                                     int length)
```
    Reads the given byte array as a little endian long.
    
    Parameters:
    
    bytes - the byte array to convert
    
    off - the offset into the array that starts the value
    
    length - the number of bytes representing the value
    
    Returns:
    
    the number read
    
    Throws:
    
    java.lang.IllegalArgumentException - if len is bigger than eight

Constructor	Description
`XXHash32()`	Creates an XXHash32 instance with a seed of 0.
`XXHash32(int seed)`	Creates an XXHash32 instance.

Class XXHash32

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.zip.Checksum

Field Detail

BUF_SIZE

ROTATE_BITS

PRIME1

PRIME2

PRIME3

PRIME4

PRIME5

oneByte

state

buffer

seed

totalLen

pos

Constructor Detail

XXHash32

XXHash32

Method Detail

reset

update

update

getValue

getInt

initializeState

process

fromLittleEndian