class ArchiverZip

class ArchiverZip implements ArchiverInterface {
    
    /**
     * The underlying ZipArchive instance that does the heavy lifting.
     *
     * @var ZipArchive
     */
    protected $zip;
    public function __construct($file_path) {
        $this->zip = new ZipArchive();
        if ($this->zip
            ->open($file_path) !== TRUE) {
            // @todo: This should be an interface-specific exception some day.
            throw new Exception(t('Cannot open %file_path', array(
                '%file_path' => $file_path,
            )));
        }
    }
    public function add($file_path) {
        $this->zip
            ->addFile($file_path);
        return $this;
    }
    public function remove($file_path) {
        $this->zip
            ->deleteName($file_path);
        return $this;
    }
    public function extract($path, array $files = array()) {
        if ($files) {
            $this->zip
                ->extractTo($path, $files);
        }
        else {
            $this->zip
                ->extractTo($path);
        }
        return $this;
    }
    public function listContents() {
        $files = array();
        for ($i = 0; $i < $this->zip->numFiles; $i++) {
            $files[] = $this->zip
                ->getNameIndex($i);
        }
        return $files;
    }
    
    /**
     * Retrieve the zip engine itself.
     *
     * In some cases it may be necessary to directly access the underlying
     * ZipArchive object for implementation-specific logic. This is for advanced
     * use only as it is not shared by other implementations of ArchiveInterface.
     *
     * @return
     *   The ZipArchive object used by this object.
     */
    public function getArchive() {
        return $this->zip;
    }

}