2 namespace GuzzleHttp\Psr7;
4 use Psr\Http\Message\StreamInterface;
7 * Uses PHP's zlib.inflate filter to inflate deflate or gzipped content.
9 * This stream decorator skips the first 10 bytes of the given stream to remove
10 * the gzip header, converts the provided stream to a PHP stream resource,
11 * then appends the zlib.inflate filter. The stream is then converted back
12 * to a Guzzle stream resource to be used as a Guzzle stream.
14 * @link http://tools.ietf.org/html/rfc1952
15 * @link http://php.net/manual/en/filters.compression.php
17 class InflateStream implements StreamInterface
19 use StreamDecoratorTrait;
21 public function __construct(StreamInterface $stream)
23 // read the first 10 bytes, ie. gzip header
24 $header = $stream->read(10);
25 $filenameHeaderLength = $this->getLengthOfPossibleFilenameHeader($stream, $header);
26 // Skip the header, that is 10 + length of filename + 1 (nil) bytes
27 $stream = new LimitStream($stream, -1, 10 + $filenameHeaderLength);
28 $resource = StreamWrapper::getResource($stream);
29 stream_filter_append($resource, 'zlib.inflate', STREAM_FILTER_READ);
30 $this->stream = new Stream($resource);
34 * @param StreamInterface $stream
38 private function getLengthOfPossibleFilenameHeader(StreamInterface $stream, $header)
40 $filename_header_length = 0;
42 if (substr(bin2hex($header), 6, 2) === '08') {
43 // we have a filename, read until nil
44 $filename_header_length = 1;
45 while ($stream->read(1) !== chr(0)) {
46 $filename_header_length++;
50 return $filename_header_length;