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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIRequest;
+
+/**
+ * Content sniffer interface. Components implementing this interface can
+ * determine a MIME type from a chunk of bytes.
+ */
+[scriptable, uuid(a5772d1b-fc63-495e-a169-96e8d3311af0)]
+interface nsIContentSniffer : nsISupports
+{
+ /**
+ * 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);
+};