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https://issues.apache.org/jira/browse/XALANJ-2725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17811737#comment-17811737
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Joe Kesselman commented on XALANJ-2725:
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Certainly if there is to be a behavior change that isn't a necessary bug fix,
making it configurable is a good idea.
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> Possible buffer-boundry issue when serializing surrogate pairs
> --------------------------------------------------------------
>
> Key: XALANJ-2725
> URL: https://issues.apache.org/jira/browse/XALANJ-2725
> Project: XalanJ2
> Issue Type: Improvement
> Security Level: No security risk; visible to anyone(Ordinary problems in
> Xalan projects. Anybody can view the issue.)
> Components: Serialization
> Reporter: Joe Kesselman
> Assignee: Joe Kesselman
> Priority: Major
> Labels: Surrogates, escaping, unicode, utf
> Attachments: astral-chars-split-buffer.patch
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> XALANJ-2419 addressed a case where "astral" Unicode characters, requiring a
> surrogate pair (two UTF-16 units), were not being serialized correctly. We
> have a proposed fix for that.
> There is reported to still be an edge case when a surrogate pair which
> crosses buffer boundaries might not be handled correctly. [~maxfortun]
> offered what looks like a reasonable proposed fix
> (https://github.com/maxfortun/xalan-j/blob/a9bd5591d9f8a523548aeec091e886b64c691628/src/org/apache/xml/serializer/ToStream.java#L1607),
> but in my testing this was not serializing the surrogate pairs correctly,
> causing regression on the tests XALANJ-2419 introduced. I don't know whether
> that's because we're taking multiple paths through
> But the edge case does appear to be real, and if so we will need some such
> solution.
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