InflateStream.php — SureCart – Ecommerce Made Easy For Selling Physical Products, Digital Downloads, Subscriptions, Donations, & Payments 4.6.4

surecart / vendor / guzzlehttp / psr7 / src / InflateStream.php

surecart / vendor / guzzlehttp / psr7 / src Last commit date

InflateStream.php

38 lines

1	<?php
2
3	declare(strict_types=1);
4
5	namespace SureCartVendors\GuzzleHttp\Psr7;
6
7	use SureCartVendors\Psr\Http\Message\StreamInterface;
8
9	/**
10	* Uses PHP's zlib.inflate filter to inflate zlib (HTTP deflate, RFC1950) or gzipped (RFC1952) content.
11	*
12	* This stream decorator converts the provided stream to a PHP stream resource,
13	* then appends the zlib.inflate filter. The stream is then converted back
14	* to a Guzzle stream resource to be used as a Guzzle stream.
15	*
16	* @see https://datatracker.ietf.org/doc/html/rfc1950
17	* @see https://datatracker.ietf.org/doc/html/rfc1952
18	* @see https://www.php.net/manual/en/filters.compression.php
19	*/
20	final class InflateStream implements StreamInterface
21	{
22	use StreamDecoratorTrait;
23
24	/** @var StreamInterface */
25	private $stream;
26
27	public function __construct(StreamInterface $stream)
28	{
29	$resource = StreamWrapper::getResource($stream);
30	// Specify window=15+32, so zlib will use header detection to both gzip (with header) and zlib data
31	// See https://www.zlib.net/manual.html#Advanced definition of inflateInit2
32	// "Add 32 to windowBits to enable zlib and gzip decoding with automatic header detection"
33	// Default window size is 15.
34	stream_filter_append($resource, 'zlib.inflate', STREAM_FILTER_READ, ['window' => 15 + 32]);
35	$this->stream = $stream->isSeekable() ? new Stream($resource) : new NoSeekStream(new Stream($resource));
36	}
37	}
38