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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * 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
 * the License. You may obtain a copy of the License at
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 *
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 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * 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
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 * Portions created by the Initial Developer are Copyright (C) 2001, 2002
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Marco Pesenti Gritti <marco@gnome.org>
 *
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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 nsIURI;

/**
 * This interface provides a way to stream data to the web browser. This allows
 * loading of data from sources which can not be accessed using URIs and
 * nsIWebNavigation.
 */
[scriptable, uuid(86d02f0e-219b-4cfc-9c88-bd98d2cce0b8)]
interface nsIWebBrowserStream : nsISupports
{
  /**
   * Prepare to load a stream of data. When this function returns successfully,
   * it must be paired by a call to closeStream.
   *
   * @param aBaseURI
   *        The base URI of the data. Must not be null. Relative
   *        URIs will be resolved relative to this URI.
   * @param aContentType
   *        ASCII string giving the content type of the data. If rendering
   *        content of this type is not supported, this method fails.
   *        This string may include a charset declaration, for example:
   *        text/html;charset=ISO-8859-1
   *
   * @throw NS_ERROR_NOT_AVAILABLE
   *        The requested content type is not supported.
   * @throw NS_ERROR_IN_PROGRESS
   *        openStream was called twice without an intermediate closeStream.
   */
  void openStream(in nsIURI aBaseURI, in ACString aContentType);

  /**
   * Append data to this stream.
   * @param aData The data to append
   * @param aLen  Length of the data to append.
   *
   * @note To append more than 4 GB of data, call this method multiple times.
   */
  void appendToStream([const, array, size_is(aLen)] in octet aData,
                      in unsigned long aLen);

  /**
   * Notifies the browser that all the data has been appended. This may notify
   * the user that the browser is "done loading" in some form.
   *
   * @throw NS_ERROR_UNEXPECTED
   *        This method was called without a preceding openStream.
   */
  void closeStream();
};
