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Posted to dev@xalan.apache.org by "Joe Kesselman (Jira)" <ji...@apache.org> on 2024/02/24 01:57:00 UTC

[jira] [Closed] (XALANJ-2725) Possible buffer-boundry issue when serializing surrogate pairs

     [ https://issues.apache.org/jira/browse/XALANJ-2725?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joe Kesselman closed XALANJ-2725.
---------------------------------
    Fix Version/s: The Latest Development Code
       Resolution: Fixed

Merged to master; this task can now be closed, though I've recorded the technical debt to consider the other issues that it implied.

> 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
>             Fix For: The Latest Development Code
>
>         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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