Hi all,
I'd like to load a series of concatenated XML documents (it's a stream of
sensor packets from a simulation).
Ideally, I would like to use xmlParseDocument() with a context from
xmlCreateIOParserCtxt() which then uses a set of read and close callbacks to
pull the data out of a C++ istream.
libxml doesn't like this because it pulls a chunk (4kB) of data at a time, and
unless I do something smart in the read function to cut it off at the end of
one document, when the parser sees the start of the next document it complains
"Extra content at the end of the document". Regardless of this being an error,
I then need to push the unused portion from the buffer back into the stream so
the next document parse can pick it up.
One solution is to wrap everything with a new root node and use SAX endElement
callbacks to trigger the data processing. I find this kind of ugly, I'd prefer
to be able to jump into the stream without needed a "header" just to make the
parser happy. I'd also rather use the tree interface at the end of each packet
and avoid doing much SAX.
The solution I'm considering is to have a SAX endElement which watches for the
end of a root node, then puts the extra data back into the stream and marks the
input complete, such as:
for(char* x=ctxt->input->end; x!=ctxt->input->cur; )
istream.putback(*--x);
ctxt->input->end=ctxt->input->cur;
done=true; // set a flag so next read callback returns -1 to end the parsing
Is this a horrible hack? Is there a better way, like a "load fragment" type of
function that wouldn't complain about the extra content?
Thanks,
-Ethan
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