#49781 [Opn->Fbk]: stream_get_meta_data seeks past http headers

ID: 49781 Updated by: jani@php.net Reported By: marques at displague dot com -Status: Open +Status: Feedback Bug Type: Streams related Operating System: linux PHP Version: 5.2.11 New Comment: Please try using this snapshot: http://snaps.php.net/php5.3-latest.tar.gz For Windows: http://windows.php.net/snapshots/ "bad dechunker" ? IIRC, something related was fixed already. Previous Comments: ------------------------------------------------------------------------ [2009-10-06 13:13:11] marques at displague dot com I missed this in stream_filter_prepend(), which explains the problem: Note: Stream data is read from resources (both local and remote) in chunks, with any unconsumed data kept in internal buffers. When a new filter is prepended to a stream, data in the internal buffers, which has already been processed through other filters will not be reprocessed through the new filter at that time. This differs from the behavior of stream_filter_append(). This behavior and the non-existence of a stream_filter_unregister() function, means that I can't code a replacement for the bad dechunker in PHP 5.3.0. ------------------------------------------------------------------------ [2009-10-06 11:20:07] sjoerd@php.net Thank you for this bug report. To properly diagnose the problem, we need a short but complete example script to be able to reproduce this bug ourselves. A proper reproducing script starts with <?php and ends with ?>, is max. 10-20 lines long and does not require any external resources such as databases, etc. If the script requires a database to demonstrate the issue, please make sure it creates all necessary tables, stored procedures etc. Please avoid embedding huge scripts into the report. ------------------------------------------------------------------------ [2009-10-05 19:59:08] marques at displague dot com Description: ------------ stream_get_meta_data will set the seek pointer in the buffer to some point past the headers. The result is that if you want to use stream_filter_prepend or stream_filter_append (after examining the meta data) your first bucket will contain data after the meta data (HTTP headers) and some of the initial content. While trying to implement a chunked stream filter for PHP < 5.3.1 I experienced this. The first bucket begins just after the hex chunklen of the second chunk. Switching to an fgets() loop on the headers (and stopping at the first empty line) corrects this. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=49781&edit=1