Protobuf\Stream::readStream PHP Метод

    public function readStream($length)
    {
        $stream = self::fromString();
        $target = $stream->stream;
        $source = $this->stream;
        if ($length < 1) {
            return $stream;
        }
        $written = stream_copy_to_stream($source, $target, $length);
        if ($written !== $length) {
            throw new RuntimeException('Failed to read stream with ' . $length . ' bytes');
        }
        $stream->seek(0);
        return $stream;
    }