org.apache.commons.codec.digest

Class MurmurHash3.IncrementalHash32

java.lang.Object

org.apache.commons.codec.digest.MurmurHash3.IncrementalHash32x86

org.apache.commons.codec.digest.MurmurHash3.IncrementalHash32

Enclosing class:

MurmurHash3

Deprecated.

Use IncrementalHash32x86. This corrects the processing of trailing bytes.

@Deprecated
public static class MurmurHash3.IncrementalHash32
extends MurmurHash3.IncrementalHash32x86

Generates 32-bit hash from input bytes. Bytes can be added incrementally and the new hash computed.

This is an implementation of the 32-bit hash function MurmurHash3_x86_32 from from Austin Applyby's original MurmurHash3 c++ code in SMHasher.

This implementation contains a sign-extension bug in the finalization step of any bytes left over from dividing the length by 4. This manifests if any of these bytes are negative.

Constructor Summary

Constructors

Constructor and Description
IncrementalHash32() Deprecated.

Method Summary

Modifier and Type	Method and Description
(package private) int	finalise(int hash, int unprocessedLength, byte[] unprocessed, int totalLen) Deprecated. Use IncrementalHash32x86. This corrects the processing of trailing bytes.

Methods inherited from class org.apache.commons.codec.digest.MurmurHash3.IncrementalHash32x86

add, end, start

Methods inherited from class java.lang.Object

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

Constructor Detail

IncrementalHash32

public IncrementalHash32()

Deprecated.

Method Detail

finalise

@Deprecated
int finalise(int hash,
                         int unprocessedLength,
                         byte[] unprocessed,
                         int totalLen)

Deprecated. Use IncrementalHash32x86. This corrects the processing of trailing bytes.

Finalize the running hash to the output 32-bit hash by processing remaining bytes and performing final mixing.

This implementation contains a sign-extension bug in the finalization step of any bytes left over from dividing the length by 4. This manifests if any of these bytes are negative.

Overrides:

finalise in class MurmurHash3.IncrementalHash32x86

Parameters:

hash - The running hash

unprocessedLength - The number of unprocessed bytes in the tail data.

unprocessed - Up to 3 unprocessed bytes from input data.

totalLen - The total number of input bytes added since the start.

Returns:

The 32-bit hash