Magento：Varien_File_Uploader中的文件大小限制

I am uploading image files using Varien_File_Uploader, i can set allowed file extensions but can i set file size limit ?

My code is

$uploader = new Varien_File_Uploader('editimg');
$uploader->setAllowedExtensions(array('jpg','jpeg','gif','png'));
$uploader->setAllowRenameFiles(false);
$uploader->setFilesDispersion(false);
$path = Mage::getBaseDir('media') . DS ;
$uploader->save($path, $imfname);

i know that i can put file size limit from php.ini, but is there any function in Varien_File_Uploader for file size ?

There aren't any related function in Varien_File_Uploader, but you can use Varien_File_Uploader::addValidateCallback($callbackName, $callbackObject, $callbackMethod) to add your own validation method based on the file size, which will be sent the value of $_FILES['editimg']['tmp_name']