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From Greg Stein <gst...@lyra.org>
Subject Re: ap_get_brigade question
Date Wed, 19 Mar 2003 01:02:33 GMT
On Tue, Mar 18, 2003 at 04:45:09PM -0800, Justin Erenkrantz wrote:
> --On Friday, March 14, 2003 12:50 AM -0800 Jim Carlson <jcarlson@jnous.com> 
> wrote:
> 
> > Howdy,
> >    I have a question in the same vein as my last post.  Can I rely on
> > ap_get_brigade(mode=AP_MODE_READBYTES, len=X) to return a brigade of length
> > no greater than X?  It would appear not, which means I need to be prepared
> > to set aside extra bytes...  But I thought this was exactly what the
> > supplying filter was supposed to do!  Confirmation requested.
> 
> A filter could hypothetically ignore AP_MODE_READBYTES's len parameter and 
> return more.  But, none of the current filters in our core do this - they will 
> return at most X bytes.  I believe we take the position if a filter returns 
> more than X in this case, it is broken.  So, it should be a good assumption to 
> make.  -- justin

Yes, it would be considered broken. The higher-level filter knows the
boundaries, and how much to ask for (or not). The lower-level filters do not
and cannot have the knowledge that the higher/application filters have.

Thus, the rule is that a filter never returns more than asked.

[ there are ways to change that, but it isn't in the architecture now ]

Cheers,
-g

-- 
Greg Stein, http://www.lyra.org/

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