Content sniffer interface. Components implementing this interface can
 determine a MIME type from a chunk of bytes.
[scriptable, uuid(a5710331-74ec-45fb-aa85-ed3bc7c36924)]
interface nsIContentSniffer : nsISupports

Methods

 Given a chunk of data, determines a MIME type.

 @param aData Data to check
 @param aLength Length of the data

 @throw NS_ERROR_NOT_AVAILABLE if no MIME type could be determined.
ACString getMIMETypeFromContent([const, array, size_is(aLength)] in octet aData, in unsigned long aLength)