Re: [xml] Possible xmlTextReaderRead() bug with improper XML

[Daniel Veillard <veillard redhat com>]

On Tue, Jan 02, 2007 at 03:44:19PM -0500, jwert ilstechnology com wrote:
> Hello,
>
> We are using the xmlreader in our application, and when parsing a char 
> buffer we get an error that says:
>
> Entity: line 1: parser error : Document is empty
>   <logquery />
> ^
>
> The problem is that the <logquery/> element has a leading 0x0C character 
> (I know that's a bad thing) but what surprised me is that 
> xmlTextReaderRead() threw the Document is empty error, but it still 
> returned ok, and we never exit our "while(xmlTextReaderRead(reader)" loop. 
>  I would have expected that to throw an error and dump me out.  If someone 
> gives me a pointer where to look in the xmlreader code, I'm happy to 
> investigate it, but I'm not too familiar with the inner workings of 
> libxml2.

  Best is to provide a copy of the document leading to the problem. 
0x0C is forbidden, I don't see how this could not result in a fatal error,
and the xmlTextReaderRead() will return -1 . Note that -1 is non zero
so your loop will continue but you should only get -1 and no data will
be available from that point. xmllint --stream parses with the reader.

Daniel


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