<?php

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declare (strict_types=1);

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namespace YoastSEO_Vendor\GuzzleHttp\Psr7;

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use YoastSEO_Vendor\Psr\Http\Message\StreamInterface;

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/**

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* Uses PHP's zlib.inflate filter to inflate zlib (HTTP deflate, RFC1950) or gzipped (RFC1952) content.

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*

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* This stream decorator converts the provided stream to a PHP stream resource,

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* then appends the zlib.inflate filter. The stream is then converted back

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* to a Guzzle stream resource to be used as a Guzzle stream.

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*

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* @see https://datatracker.ietf.org/doc/html/rfc1950

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* @see https://datatracker.ietf.org/doc/html/rfc1952

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* @see https://www.php.net/manual/en/filters.compression.php

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*/

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final class InflateStream implements \YoastSEO_Vendor\Psr\Http\Message\StreamInterface

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{

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use StreamDecoratorTrait;

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/** @var StreamInterface */

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private $stream;

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public function __construct(\YoastSEO_Vendor\Psr\Http\Message\StreamInterface $stream)

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{

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$resource = \YoastSEO_Vendor\GuzzleHttp\Psr7\StreamWrapper::getResource($stream);

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// Specify window=15+32, so zlib will use header detection to both gzip (with header) and zlib data

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// See https://www.zlib.net/manual.html#Advanced definition of inflateInit2

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// "Add 32 to windowBits to enable zlib and gzip decoding with automatic header detection"

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// Default window size is 15.

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\stream_filter_append($resource, 'zlib.inflate', \STREAM_FILTER_READ, ['window' => 15 + 32]);

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$this->stream = $stream->isSeekable() ? new \YoastSEO_Vendor\GuzzleHttp\Psr7\Stream($resource) : new \YoastSEO_Vendor\GuzzleHttp\Psr7\NoSeekStream(new \YoastSEO_Vendor\GuzzleHttp\Psr7\Stream($resource));

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}

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}

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