[xml] libxml2 SAX python interface: Bug with Python3

[René Neumann <necoro necoro eu>]

Dear all,

when using the libxml2 interface via xml.sax in Python3, I get an
exception concerning str vs bytes. Please see the following minimal example:

Python 3.2.5 (default, Aug 26 2013, 21:33:16)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
> > > import xml.sax
> > > from io import BytesIO
> > > saxparser = xml.sax.make_parser(["drv_libxml2"])
> > > source = xml.sax.xmlreader.InputSource()
> > > source.setByteStream(BytesIO(b'<rss></rss>'))
> > > saxparser.parse(source)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib64/python3.2/site-packages/drv_libxml2.py", line 223, in
parse
    eltName = _d(reader.Name())
  File "/usr/lib64/python3.2/site-packages/drv_libxml2.py", line 70, in _d
    return _decoder(s)[0]
  File "/usr/lib64/python3.2/encodings/utf_8.py", line 16, in decode
    return codecs.utf_8_decode(input, errors, True)
TypeError: 'str' does not support the buffer interface


A quick look reveals, that all(?) the reader.…()-calls already return an
encoded string and hence this _d() is moot. But I don't know which side
needs to be fixed.

Regards,
René

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