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https://issues.apache.org/jira/browse/XERCESJ-1668?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jan Berkel updated XERCESJ-1668:
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Attachment: surrogate.patch
> Off-by-one bug w/ surrogates in UTF8Reader
> ------------------------------------------
>
> Key: XERCESJ-1668
> URL: https://issues.apache.org/jira/browse/XERCESJ-1668
> Project: Xerces2-J
> Issue Type: Bug
> Components: Other
> Reporter: Jan Berkel
> Attachments: surrogate.patch
>
>
> There's a bug in the surrogate handling when the reader buffer is exhausted
> and only the high-part can be written. On the next run the low-part gets
> added but the buffer space calculation is off by one.
> This gets triggered when parsing the current [enwiktionary dump
> file|http://dumps.wikimedia.org/enwiktionary/20151102/enwiktionary-20151102-pages-articles.xml.bz2].
> {noformat}
> org.xml.sax.SAXParseException; lineNumber: 99849520; columnNumber: 47;
> Invalid byte 2 of 4-byte UTF-8 sequence.
> {noformat}
> In the attached patch I added a testcase for this bug. Another related issue
> is that when the low-part is written as last part of the stream -1 is
> returned instead of 1.
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