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favicon-helpers.js 
/* 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/. */

const { Cc, Ci, Cu } = require('chrome');
const { Loader } = require('sdk/test/loader');
const loader = Loader(module);
const file = require('sdk/io/file');
const httpd = loader.require('sdk/test/httpd');
const { pathFor } = require('sdk/system');
const { startServerAsync } = httpd;
const basePath = pathFor('ProfD');
const { atob } = Cu.import("resource://gre/modules/Services.jsm", {});
const historyService = Cc["@mozilla.org/browser/nav-history-service;1"]
                       .getService(Ci.nsINavHistoryService);
Cu.import('resource://gre/modules/XPCOMUtils.jsm');
const ObserverShimMethods = ['onBeginUpdateBatch', 'onEndUpdateBatch',
  'onVisit', 'onTitleChanged', 'onDeleteURI', 'onClearHistory',
  'onPageChanged', 'onDeleteVisits'];

/*
 * Shims NavHistoryObserver
 */

let noop = function () {}
let NavHistoryObserver = function () {};
ObserverShimMethods.forEach(function (method) {
  NavHistoryObserver.prototype[method] = noop;
});
NavHistoryObserver.prototype.QueryInterface = XPCOMUtils.generateQI([
  Ci.nsINavHistoryObserver
]);

/*
 * Uses history observer to watch for an onPageChanged event,
 * which detects when a favicon is updated in the registry.
 */
function onFaviconChange (uri, callback) {
  let observer = Object.create(NavHistoryObserver.prototype, {
    onPageChanged: {
      value: function onPageChanged(aURI, aWhat, aValue, aGUID) {
        if (aWhat !== Ci.nsINavHistoryObserver.ATTRIBUTE_FAVICON)
          return;
        if (aURI.spec !== uri)
          return;
        historyService.removeObserver(this);
        callback(aValue);
      }
    }
  });
  historyService.addObserver(observer, false);
}
exports.onFaviconChange = onFaviconChange;

/*
 * Takes page content, a page path, and favicon binary data
 */
function serve ({name, favicon, port, host}) {
  let faviconTag = '<link rel="icon" type="image/x-icon" href="/'+ name +'.ico"/>';
  let content = '<html><head>' + faviconTag + '<title>'+name+'</title></head><body></body></html>';
  let srv = startServerAsync(port, basePath);
  let pagePath = file.join(basePath, name + '.html');
  let iconPath = file.join(basePath, name + '.ico');
  let pageStream = file.open(pagePath, 'w');
  let iconStream = file.open(iconPath, 'wb');
  iconStream.write(favicon);
  iconStream.close();
  pageStream.write(content);
  pageStream.close();
  return srv;
}
exports.serve = serve;

let binFavicon = exports.binFavicon = atob('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');
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