RetroZilla/netwerk/base/public/nsIUnicharStreamLoader.idl

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
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 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2002
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *    Darin Fisher <darin@netscape.com>  (original author)
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
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#include "nsISupports.idl"

interface nsIUnicharInputStream;
interface nsIUnicharStreamLoader;
interface nsIChannel;

[scriptable, uuid(e06e8b08-8cdd-4503-a0a0-6f3b943602af)]
interface nsIUnicharStreamLoaderObserver : nsISupports
{
  /**
   * Called when the first full segment of data if available.
   *
   * @param aLoader the unichar stream loader
   * @param aContext the aContext parameter passed to the loader's init method
   * @param aFirstSegment the raw bytes of the first full data segment
   * @param aLength the length of aFirstSegment
   *
   * @return charset corresponding to this stream
   */
  ACString onDetermineCharset(in nsIUnicharStreamLoader aLoader,
                              in nsISupports aContext,
                              [size_is(aLength)] in string aFirstSegment,
                              in unsigned long aLength);

  /**
   * Called when the entire stream has been loaded.
   *
   * @param aLoader the unichar stream loader
   * @param aContext the aContext parameter passed to the loader's init method
   * @param aStatus the status of the underlying channel
   * @param aUnicharData the unichar input stream containing the data.  This
   *        can be null in some failure conditions.
   */
  void onStreamComplete(in nsIUnicharStreamLoader aLoader,
                        in nsISupports aContext,
                        in nsresult aStatus,
                        in nsIUnicharInputStream aUnicharData);
};

[scriptable, uuid(8a3eca16-167e-443d-9485-7e84ed822e95)]
interface nsIUnicharStreamLoader : nsISupports
{
  const unsigned long DEFAULT_SEGMENT_SIZE = 4096;

  /**
   * Initializes the unichar stream loader
   *
   * @param aChannel the channel to read data from.  This should _not_ be
   *        opened; the loader will open the channel itself.
   * @param aObserver the observer to notify when a charset is needed and when
   *        the load is complete
   * @param aContext an opaque context pointer
   * @param aSegmentSize the size of the segments to use for the data, in bytes
   */
  
  void init(in nsIChannel aChannel,
            in nsIUnicharStreamLoaderObserver aObserver,
            in nsISupports aContext,
            in unsigned long aSegmentSize);

  /**
   * The channel attribute is only valid inside the onDetermineCharset
   * and onStreamComplete callbacks.  Otherwise it will be null.
   */
  readonly attribute nsIChannel channel;

  /**
   * The charset that onDetermineCharset returned, if that's been
   * called.
   */
  readonly attribute ACString charset;
};