When the libxml2 parser is fed data with an odd combination of invalid input (triggering the parser to assume 2 or 4 byte encodings were in play), I/O errors might occur. In that case, the parser context will not have its internal error set, but the call to xmlParseChunk will return the right error. The parse() method now uses the output of xmlParseChunk directly instead of trying to obtain the error from the parser context afterwards. Encoding errors during parsing were emitted to stderr because the default error handlers were still in place. These have been replaced with custom handlers that suppress the output. Test-Information: Unit tests pass on Debian 9 Change-Id: Ie01db4be467e5197203c9d07d3356f5d44d8b9b4