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https://issues.apache.org/jira/browse/CODEC-172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13672022#comment-13672022
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Sebb commented on CODEC-172:
----------------------------
0x2f is '/' which is indeed 63 in Base 64 - and is not valid in Base 32.
The code was originally copied from Base64.java, so you are correct; good catch.
> Base32 decode table has spurious value
> --------------------------------------
>
> Key: CODEC-172
> URL: https://issues.apache.org/jira/browse/CODEC-172
> Project: Commons Codec
> Issue Type: Bug
> Affects Versions: 1.8
> Environment: Any
> Reporter: Matt Bishop
> Assignee: Sebb
> Priority: Trivial
>
> The Base32.DECODE_TABLE array contains the value 63 at pos 41:
> ...
> -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 63, // 20-2f
> ...
> I think this is a mistake because this value is not found in RFC-4648? It
> looks like a copy-paste error from Base64.
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