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<?php |
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namespace GuzzleHttp\Psr7; |
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|
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use Psr\Http\Message\StreamInterface; |
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|
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/** |
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* Uses PHP's zlib.inflate filter to inflate deflate or gzipped content. |
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* |
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* This stream decorator skips the first 10 bytes of the given stream to remove |
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* the gzip header, 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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* @link http://tools.ietf.org/html/rfc1952 |
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* @link http://php.net/manual/en/filters.compression.php |
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*/ |
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class InflateStream implements StreamInterface |
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{ |
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use StreamDecoratorTrait; |
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|
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public function __construct(StreamInterface $stream) |
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{ |
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// read the first 10 bytes, ie. gzip header |
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$header = $stream->read(10); |
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$filenameHeaderLength = $this->getLengthOfPossibleFilenameHeader($stream, $header); |
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// Skip the header, that is 10 + length of filename + 1 (nil) bytes |
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$stream = new LimitStream($stream, -1, 10 + $filenameHeaderLength); |
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$resource = StreamWrapper::getResource($stream); |
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stream_filter_append($resource, 'zlib.inflate', STREAM_FILTER_READ); |
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$this->stream = $stream->isSeekable() ? new Stream($resource) : new NoSeekStream(new Stream($resource)); |
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} |
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|
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/** |
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* @param StreamInterface $stream |
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* @param $header |
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* @return int |
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*/ |
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private function getLengthOfPossibleFilenameHeader(StreamInterface $stream, $header) |
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{ |
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$filename_header_length = 0; |
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|
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if (substr(bin2hex($header), 6, 2) === '08') { |
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// we have a filename, read until nil |
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$filename_header_length = 1; |
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while ($stream->read(1) !== chr(0)) { |
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$filename_header_length++; |
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} |
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} |
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|
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return $filename_header_length; |
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} |
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} |
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|
