nsIContentSniffer in Firefox 3.0

Implemented by

@mozilla.org/network/binary-detector;1
@mozilla.org/image/loader;1
@mozilla.org/browser/feeds/sniffer;1
@mozilla.org/streamconv;1?from=application/x-unknown-content-type&to=*/*
@mozilla.org/network/content-sniffer;1

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

[scriptable, uuid(a5772d1b-fc63-495e-a169-96e8d3311af0)]

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)