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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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interface nsIRequest;
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/**
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* Content sniffer interface. Components implementing this interface can
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* determine a MIME type from a chunk of bytes.
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*/
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[scriptable, uuid(a5772d1b-fc63-495e-a169-96e8d3311af0)]
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interface nsIContentSniffer : nsISupports
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{
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/**
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* Given a chunk of data, determines a MIME type. Information from the given
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* request may be used in order to make a better decision.
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*
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* @param aRequest The request where this data came from. May be null.
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* @param aData Data to check
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* @param aLength Length of the data
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*
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* @return The content type
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*
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* @throw NS_ERROR_NOT_AVAILABLE if no MIME type could be determined.
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*
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* @note Implementations should consider the request read-only. Especially,
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* they should not attempt to set the content type property that subclasses of
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* nsIRequest might offer.
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*/
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ACString getMIMETypeFromContent(in nsIRequest aRequest,
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[const,array,size_is(aLength)] in octet aData,
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in unsigned long aLength);
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};