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Implemented by

 Content sniffer interface. Components implementing this interface can
 determine a MIME type from a chunk of bytes.

 NOTE: This interface is equivalent to nsIContentSniffer, but its method has
 an additional paramter. It exists only on the 1.8 branch of Mozilla; use
 nsIContentSniffer on newer branches.

 @status TEMPORARY
[scriptable, uuid(a5772d1b-fc63-495e-a169-96e8d3311af0)]
interface nsIContentSniffer_MOZILLA_1_8_BRANCH : nsISupports

Methods

 Given a chunk of data, determines a MIME type. Information from the given
 request may be used in order to make a better decision.

 @param aRequest The request where this data came from. May be null.
 @param aData Data to check
 @param aLength Length of the data

 @return The content type

 @throw NS_ERROR_NOT_AVAILABLE if no MIME type could be determined.

 @note Implementations should consider the request read-only. Especially,
 they should not attempt to set the content type property that subclasses of
 nsIRequest might offer.
ACString getMIMETypeFromContent(in nsIRequest aRequest, [const, array, size_is(aLength)] in octet aData, in unsigned long aLength)