Further Integer Overflows due to missing ASCII check
Related to Issue #217 (closed)
Please fix at the root of the problem to avoid issues in further locations.
https://github.com/GNOME/libxml2/blob/master/parserInternals.c#L852 https://github.com/GNOME/libxml2/blob/master/tree.c#L1313 https://github.com/GNOME/libxml2/blob/master/tree.c#L1341