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- Veröffentlicht
- 28.08.2024
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InflateStream.php
01 <?php
02
03 namespace GuzzleHttp\Psr7;
04
05 use Psr\Http\Message\StreamInterface;
06
07 /**
08 * Uses PHP's zlib.inflate filter to inflate deflate or gzipped content.
09 *
10 * This stream decorator skips the first 10 bytes of the given stream to remove
11 * the gzip header, converts the provided stream to a PHP stream resource,
12 * then appends the zlib.inflate filter. The stream is then converted back
13 * to a Guzzle stream resource to be used as a Guzzle stream.
14 *
15 * @link http://tools.ietf.org/html/rfc1952
16 * @link http://php.net/manual/en/filters.compression.php
17 *
18 * @final
19 */
20 class InflateStream implements StreamInterface
21 {
22 use StreamDecoratorTrait;
23
24 public function __construct(StreamInterface $stream)
25 {
26 // read the first 10 bytes, ie. gzip header
27 $header = $stream->read(10);
28 $filenameHeaderLength = $this->getLengthOfPossibleFilenameHeader($stream, $header);
29 // Skip the header, that is 10 + length of filename + 1 (nil) bytes
30 $stream = new LimitStream($stream, -1, 10 + $filenameHeaderLength);
31 $resource = StreamWrapper::getResource($stream);
32 stream_filter_append($resource, 'zlib.inflate', STREAM_FILTER_READ);
33 $this->stream = $stream->isSeekable() ? new Stream($resource) : new NoSeekStream(new Stream($resource));
34 }
35
36 /**
37 * @param StreamInterface $stream
38 * @param $header
39 *
40 * @return int
41 */
42 private function getLengthOfPossibleFilenameHeader(StreamInterface $stream, $header)
43 {
44 $filename_header_length = 0;
45
46 if (substr(bin2hex($header), 6, 2) === '08') {
47 // we have a filename, read until nil
48 $filename_header_length = 1;
49 while ($stream->read(1) !== chr(0)) {
50 $filename_header_length++;
51 }
52 }
53
54 return $filename_header_length;
55 }
56 }
57