protected function listArchiveContent(PhingFile $zipfile)
    {
        $zip = new ZipArchive();
        $zip->open($zipfile->getAbsolutePath());

        $content = [];
        for ($i = 0; $i < $zip->numFiles; $i++) {
            $content[] = [
                'filename' => $zip->getNameIndex($i)
            ];
        }

        return $content;
    }