Jan Berkel created XERCESJ-1668:
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Summary: 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
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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