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java.lang.Objectorg.apache.cassandra.utils.PureJavaCrc32
public class PureJavaCrc32
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
This class is copied from hadoop-commons project.
(The initial patch added PureJavaCrc32 was HADOOP-6148)| Constructor Summary | |
|---|---|
PureJavaCrc32()
Create a new PureJavaCrc32 object. |
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| Method Summary | |
|---|---|
long |
getValue()
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void |
reset()
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void |
update(byte[] b,
int off,
int len)
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void |
update(int b)
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| Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
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public PureJavaCrc32()
| Method Detail |
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public long getValue()
getValue in interface java.util.zip.Checksumpublic void reset()
reset in interface java.util.zip.Checksum
public void update(byte[] b,
int off,
int len)
update in interface java.util.zip.Checksumpublic final void update(int b)
update in interface java.util.zip.Checksum
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