org.apache.hadoop.util

类 PureJavaCrc32

java.lang.Object

org.apache.hadoop.util.PureJavaCrc32

所有已实现的接口:

Checksum

public class PureJavaCrc32
extends Object
implements Checksum

A pure-java implementation of the CRC32 checksum that uses the same polynomial as the built-in native CRC32. This is to avoid the JNI overhead for certain uses of Checksumming where many small pieces of data are checksummed in succession. The current version is ~10x to 1.8x as fast as Sun's native java.util.zip.CRC32 in Java 1.6

另请参阅:

CRC32

构造器概要

构造器

构造器和说明
PureJavaCrc32()

方法概要

方法

限定符和类型	方法和说明
long	getValue()
void	reset()
void	update(byte[] b, int off, int len)
void	update(int b)

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

PureJavaCrc32

public PureJavaCrc32()

方法详细资料

getValue

public long getValue()

指定者:

getValue 在接口中 Checksum

reset

public void reset()

指定者:

reset 在接口中 Checksum

update

public void update(byte[] b,
          int off,
          int len)

指定者:

update 在接口中 Checksum

update

public final void update(int b)

指定者:

update 在接口中 Checksum