Chris@0: <?php
Chris@0: namespace GuzzleHttp\Psr7;
Chris@0: 
Chris@0: use Psr\Http\Message\StreamInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Stream decorator that begins dropping data once the size of the underlying
Chris@0:  * stream becomes too full.
Chris@0:  */
Chris@0: class DroppingStream implements StreamInterface
Chris@0: {
Chris@0:     use StreamDecoratorTrait;
Chris@0: 
Chris@0:     private $maxLength;
Chris@0: 
Chris@0:     /**
Chris@0:      * @param StreamInterface $stream    Underlying stream to decorate.
Chris@0:      * @param int             $maxLength Maximum size before dropping data.
Chris@0:      */
Chris@0:     public function __construct(StreamInterface $stream, $maxLength)
Chris@0:     {
Chris@0:         $this->stream = $stream;
Chris@0:         $this->maxLength = $maxLength;
Chris@0:     }
Chris@0: 
Chris@0:     public function write($string)
Chris@0:     {
Chris@0:         $diff = $this->maxLength - $this->stream->getSize();
Chris@0: 
Chris@0:         // Begin returning 0 when the underlying stream is too large.
Chris@0:         if ($diff <= 0) {
Chris@0:             return 0;
Chris@0:         }
Chris@0: 
Chris@0:         // Write the stream or a subset of the stream if needed.
Chris@0:         if (strlen($string) < $diff) {
Chris@0:             return $this->stream->write($string);
Chris@0:         }
Chris@0: 
Chris@0:         return $this->stream->write(substr($string, 0, $diff));
Chris@0:     }
Chris@0: }