Hello.
Just learning about stream filtering and have 2 questions I hope
someone can give me some pointers on.
1 - Bucketing.
In reading a bit about how this works, the data is passed in chunks
through the filter - known as a bucket brigade.
How does this work if, for example, the search string is chopped by
the bucketing system? It would seem that you would end up with 2 parts
of the search element, neither would be matched for replacing and then
the whole element would be reconstituted in the output.
My filter method is ...
function filter($r_In, $r_Out, &$i_Consumed, $b_Closing)
{
while ($o_Bucket = stream_bucket_make_writeable($r_In))
{
$o_Bucket->data = preg_replace('`<(/?)(\d+)`', '<$1fixed_$2',
$o_Bucket->data);
$i_Consumed += $o_Bucket->datalen;
stream_bucket_append($r_Out, $o_Bucket);
}
return PSFS_PASS_ON;
}
This is working fine (so far as I can tell as SimpleXMLIterator is now
happy to read the XML file), but I'm guessing I'm missing something
here if my understanding is correct.
2 - Stream wrapping.
At the moment, we download a .gz file and decompress it into the .xml
file. I know I can use a zlib:// stream wrapper to save me having to
decode the .gz file first. This means smaller downloads and less
storage. We can even use the zlib:// filter on the URL, but we cache
the .gz file locally, so that isn't important.
But for a small set of files (their origin is known, so I can create a
rule for this issue), I have to expand the .gz file first and then fix
the file using the filter above. I then have two paths to load the xml
- either a zlib:// decompress stream or a straight local file.
I'd like to work out how to create a stream wrapper to allow me to say
SOMETHING like ...
$o_MySXI = new SimpleXMLIterator('xml.NoNumericTags://compress.zlib:///development/BadlyFormed.gz');
If this was possible, I'd be a LOT happier and could simply stream
from the .gz files without needing to hold onto anything.
Ideas/suggestions/examples/code gratefully received.
Regards,
Richard.
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Richard Quadling
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