Quick lesson in using stream Filters

Sara golemon posted an article in The newsgroup about how to use stream filters in PHP extensions. The reference is as follows:

If all you want to do is use an already implemented one just do this:

Php_stream * stream;
Php_stream_filter * filter;
Zval * arguments = NULL;/* populate this with value (s) appropriate to the filter */

Stream = php_stream_open_wrapper (... blah .....);
Filter = php_stream_filter_create ("filtername", arguments, php_stream_is_persistent (Stream) tsrmls_cc );
/* Or & stream-> writefilters as appropriate */
Php_stream_filter_append (& stream-> readfilters, filter );

/* Of course, in the real world you'll want to check both stream and filter for null as they may have failed to instantiate */

That said, I don't think iconv. * will be any help. It only covers
Base64 _ (EN | de) code () and quoted_printable _ (EN | de) code ().

Filter Implementation is a bit trickier. Take a look
EXT/standard/filters. C for more info on that. If you come up with a UTF
Converter, I'm sure it can be added to the standard set of filters.

-Sara

"L0t3k" <cshmoove @ xxxxxxxxxxxxx> wrote in message
News: 20040823142259.47665.qmail @ xxxxxxxxxxxxxxx
> Can anyone give a hint as to how to use stream filters from an extension?
>
> I have to parse input files which may be in a variety of encodings (mainly
> Utf8), and processing is done internally in utf16.
>
> I noticed that there is an iconv filter, but I havent a clue (even after
> Googling) of how to use it.
>
> L0t3k

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