protected function getResourceLength(): int
    {
        if (null === $this->fileName) {
            return parent::getResourceLength();
        }

        if (substr($this->fileName, 0, 16) === 'compress.zlib://') {
            return filesize(substr($this->fileName, 16));
        } elseif (substr($this->fileName, 0, 17) === 'compress.bzip2://') {
            return filesize(substr($this->fileName, 17));
        }

        return parent::getResourceLength();
    }