This class can be used to check the presence of files in file hosting services. It takes a URL and checks whether it is the download page of a file available in a file hosting service. If the download page URL is value, the class retrieves the download page and parses it to obtain the file size. Currently the class supports the following file hosting services: rapidshare.com, rapidshare.de, megaupload.com, megarotic.com, depositfiles.com, megashares.com, etc..