PureJavaCrc32C (Apache Hadoop Main 3.5.0 API)
Description: declaration: package: org.apache.hadoop.util, class: PureJavaCrc32C

Package org.apache.hadoop.util

# Class PureJavaCrc32C

java.lang.Object
org.apache.hadoop.util.PureJavaCrc32C

All Implemented Interfaces:
  `Checksum`

@Public @Stable public class PureJavaCrc32C extends Object implements Checksum
A pure-java implementation of the CRC32 checksum that uses the CRC32-C polynomial, the same polynomial used by iSCSI and implemented on many Intel chipsets supporting SSE4.2.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `PureJavaCrc32C()`
  Create a new PureJavaCrc32 object.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `long`
  `getValue()`
  `static int`
  `mod(long x)`
  Compute x mod p, where p is the CRC32C polynomial.
  `void`
  `reset()`
  `void`
  `update(byte[] b, int off, int len)`
  `final 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`

- ## Constructor Details

  - ### PureJavaCrc32C

    public PureJavaCrc32C()
    Create a new PureJavaCrc32 object.

- ## Method Details

  - ### getValue

    public long getValue()
    Specified by:
      `getValue` in interface `Checksum`

  - ### reset

    public void reset()
    Specified by:
      `reset` in interface `Checksum`

  - ### update

    public void update(byte[] b, int off, int len)
    Specified by:
      `update` in interface `Checksum`

  - ### mod

    public static int mod(long x)
    Compute x mod p, where p is the CRC32C polynomial.
    Parameters:
      `x` - the input value
    Returns:
      x mod p

  - ### update

    public final void update(int b)
    Specified by:
      `update` in interface `Checksum`