File indexing completed on 2024-12-29 05:27:23

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