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https://issues.apache.org/jira/browse/CODEC-91?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874333#action_12874333
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Sebb commented on CODEC-91:
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The buffer output code when PAD is detected is the same as for the final "if
(eof && modulus != 0)".
This does nothing if modulus == 1; I wonder if this is the cause of the
behaviour reported above by Raphael, which should probably be a new JIRA.
Seems to me there need to be tests which exercise all possible moduli.
> Handling of embedded padding in base64 encoded data changed in 1.4
> ------------------------------------------------------------------
>
> Key: CODEC-91
> URL: https://issues.apache.org/jira/browse/CODEC-91
> Project: Commons Codec
> Issue Type: Bug
> Affects Versions: 1.4
> Reporter: Chris Pimlott
> Attachments: codec-91-actually-works-and-tests-yay.patch
>
>
> 1.4 changed the way that embedded padding characters (i.e. "=") were handled
> when decoding base64 data. Previously, the decoder ignored them and decoded
> all the data. Now it stops upon encountering the first padding byte. This
> breaks compatibility with previous versions.
> For example, in 1.4,
> b64.decode("Y29tbW9ucwo=".getBytes());
> gives the same result as
> b64.decode("Y29tbW9ucwo=Y29tbW9ucwo=".getBytes());
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