author Norisz Fay <>
Tue, 07 Dec 2021 17:32:45 +0200
changeset 601199 cd413a8401785169b480b8643b6e3880043c5093
parent 224853 4ec37503ea6a752baf92e053ede5f0ff7750ff36
permissions -rw-r--r--
Merge autoland to mozilla-central. a=merge

/* 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 */

#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);