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