1 <?php
 2 
 3 namespace Http\Message\Encoding;
 4 
 5 use Psr\Http\Message\StreamInterface;
 6 
 7 /**
 8  * Stream compress (RFC 1950).
 9  *
10  * @author Joel Wurtz <joel.wurtz@gmail.com>
11  */
12 class CompressStream extends FilteredStream
13 {
14     /**
15      * @param StreamInterface $stream
16      * @param int             $level
17      */
18     public function __construct(StreamInterface $stream, $level = -1)
19     {
20         if (!extension_loaded('zlib')) {
21             throw new \RuntimeException('The zlib extension must be enabled to use this stream');
22         }
23 
24         parent::__construct($stream, ['window' => 15, 'level' => $level], ['window' => 15]);
25     }
26 
27     /**
28      * {@inheritdoc}
29      */
30     public function getReadFilter()
31     {
32         return 'zlib.deflate';
33     }
34 
35     /**
36      * {@inheritdoc}
37      */
38     public function getWriteFilter()
39     {
40         return 'zlib.inflate';
41     }
42 }
43 

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