I have huge lack of understanding source/filters/sink concept. I want
to parse xml file from crypto filters.
libxml2 has a function to parse an input from callback-based stream. It
looks like:
int callbackFunc(void *context, const char *buffer, int len)
{
// function must read a data, put it in the buffer (not more than len
bytes) and return real amount of read bytes.
// at the end of the stream it must return 0
// -1 for error indication.
}
then I call library function:
xmlDocPtr = xmlReadIO(..., callbackFunc, context, ...);
The library invokes the callback as it wants.
I want to feed a data from crypto++.
If I use just FileSource as source object, it work fine. Something like
this:
int callbackFunc(void *context, const char *buffer, int len)
{
FileSource * source = (FileSource *)context;
source->Pump(len);
return source->Get(buffer, len);
}
...
FileSource source("a file");
xmlDocPtr = xmlReadIO(..., callbackFunc, &source, ...);
But if I try to use filters (e.g. encryption+compression) this method
doesn't work, because I don't know how much I have to Pump, without
pumping Get doesn't give any data.
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