On Sun, 28 Apr 2002, Miguel A Paraz wrote:
> On Fri, Apr 26, 2002 at 06:20:00PM +0100, Nick Kew wrote:
> > On Sat, 27 Apr 2002, Miguel A Paraz wrote:
> >
> > > I'm just going through the stream and calling the content handler in the
> > > same way the blocking parse() method does.
> >
> > This is normal with SAX in those libraries I've used (expat, Xerces,
> > libxml2). You just need to select a parse mode that gets its input
> > via a callback, and then provide a non-blocking callback. Indeed,
> > you can do the same with DOM, though there's less to gain by it.
>
> I couldn't find a SAX parse mode that gets input via a callback.
> The variations of SAXParser.parse() vary on their input (File, InputSource,
> InputStream or URI). What did I miss?
OK, I've now uploaded an update to mod_xml to do exactly this.
Your language looks like the Xerces SAX implementation, so why
don't I just cut & paste from mod_xml:
class APInputSource : public InputSource {
class APInputStream : public BinInputStream {
request_rec* r ;
unsigned int pos ;
APInputStream(request_rec* rec) : r(rec), pos(0) {}
unsigned int readBytes( XMLByte* const toFill,
const unsigned int maxsz) {
unsigned int bytes = ap_get_client_block(r, (char*)toFill, maxsz) ;
pos += bytes ;
return bytes ;
}
unsigned int curPos() const { return pos ; }
friend APInputSource ;
} ;
request_rec* r ;
public:
APInputSource(request_rec* rec) : r(rec) {}
BinInputStream* makeStream() const {
if ( ap_setup_client_block(r, REQUEST_CHUNKED_ERROR) != 0 )
throw exception() ; /* this should be relaxed but I
still need to RTFM */
ap_should_client_block( r ) ;
return new APInputStream ( r ) ;
}
} ;
So a parser - either SAX or DOM - just needs:
APInputSource mbuf(r) ;
parser->parse(mbuf) ;
and it works with exactly the data Apache feeds it, as the data arrive.
The libxml2 implementation is very similar, while expat makes it even
easier.
--
Nick Kew
Available for contract work - Programming, Unix, Networking, Markup, etc.
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