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From "Claude Warren (Jira)" <j...@apache.org>
Subject [jira] [Updated] (CODEC-264) murmur3.hash64() does not account for unsigned in arguments
Date Sat, 02 Nov 2019 08:50:00 GMT

     [ https://issues.apache.org/jira/browse/CODEC-264?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Claude Warren updated CODEC-264:
--------------------------------
    Attachment: YonikMurmur3Tests.java

> murmur3.hash64() does not account for unsigned in arguments
> -----------------------------------------------------------
>
>                 Key: CODEC-264
>                 URL: https://issues.apache.org/jira/browse/CODEC-264
>             Project: Commons Codec
>          Issue Type: Bug
>    Affects Versions: 1.13
>            Reporter: Claude Warren
>            Priority: Major
>         Attachments: YonikMurmur3Tests.java
>
>
> The original murmur3_x64_128 code used unsigned int for seed arguments.  Using the equivalent
bit patterns in the commons codec version does not yield the same results.
> I believe this is because the commons version does not account for sign extension etc.
> Yonic Seeley [~yonik] has explains the issue in his implementation https://github.com/yonik/java_util/blob/master/src/util/hash/MurmurHash3.java
> He provides a test case to show that his code returns the same answers as the original
C/C++ code.  I modified that test to call the codec version to show the error.
> I have attached that test case.
> Given that the original code is in the wild I am uncertain how to fix this issue.



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