It would be nice to have a functions like getFileMimeType() and getFileSize in Zend_Form_Element_File class.

public function getFileMimeType() {

$content = $this->getTransferAdapter()->getFileInfo($this->getName());
$mimetype = $content['type'];

if (!isset($mimetype)) {
        return null;
    }        

    return $mimetype;

}

public function getFileSize() { $content = $this->getTransferAdapter()->getFileInfo($this->getName()); $bytes = $content['type'];

if (!isset($bytes)) {
        return null;
    }   
/* this method might return formated size in specific unit like kB,mB,gB ... */

return $bytes;

}