#43793 [Opn->Csd]: zlib filter is unable to auto-detect gzip/zlib file headers

ID: 43793 Updated by: cellog@php.net Reported By: cellog@php.net -Status: Open +Status: Closed Bug Type: Streams related Operating System: n/a PHP Version: 5.2.5 Assigned To: cellog New Comment: This bug has been fixed in CVS. Snapshots of the sources are packaged every three hours; this change will be in the next snapshot. You can grab the snapshot at http://snaps.php.net/. Thank you for the report, and for helping us make PHP better. Previous Comments: ------------------------------------------------------------------------ [2008-01-09 06:38:43] cellog@php.net Description: ------------ according to the zlib documentation for inflateInit2() in zlib.h (online copy at http://www.raspberryginger.com/jbailey/minix/html/zlib_8h-source.html): windowBits can also be greater than 15 for optional gzip decoding. Add 32 to windowBits to enable zlib and gzip decoding with automatic header detection, or add 16 to decode only the gzip format (the zlib format will return a Z_DATA_ERROR) zlib.inflate filter's filterparams only accepts window size of 15, but should accept up to 15+32 according to these docs. Reproduce code: --------------- <?php /* $Id: zlib_filter_inflate.phpt,v 1.1.2.1 2005/11/24 04:37:47 pollita Exp $ */ $a = gzopen(dirname(__FILE__) . '/test.txt.gz', 'w'); fwrite($a, "This is quite the thing ain't it\n"); fclose($a); $fp = fopen(dirname(__FILE__) . '/test.txt.gz', 'r'); stream_filter_append($fp, 'zlib.inflate', STREAM_FILTER_READ); echo fread($fp, 2000); fclose($fp); echo "1\n"; $fp = fopen(dirname(__FILE__) . '/test.txt.gz', 'r'); // zlib format $fp = fopen(dirname(__FILE__) . '/test.txt.gz', 'r'); stream_filter_append($fp, 'zlib.inflate', STREAM_FILTER_READ, array('window' => 15+16)); echo "2\n"; echo fread($fp, 2000); fclose($fp); // auto-detect $fp = fopen(dirname(__FILE__) . '/test.txt.gz', 'r'); stream_filter_append($fp, 'zlib.inflate', STREAM_FILTER_READ, array('window' => 15+32)); echo "3\n"; echo fread($fp, 2000); fclose($fp); ?> Expected result: ---------------- 1 2 This is quite the thing ain't it 3 This is quite the thing ain't it Actual result: -------------- 1 2 3 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=43793&edit=1