/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/* Copyright 2012 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/* globals PDFJS, PDFBug, FirefoxCom, Stats, Cache, ProgressBar,
           DownloadManager, getFileName, getPDFFileNameFromURL,
           PDFHistory, Preferences, SidebarView, ViewHistory, Stats,
           PDFThumbnailViewer, URL, noContextMenuHandler, SecondaryToolbar,
           PasswordPrompt, PDFPresentationMode, PDFDocumentProperties, HandTool,
           Promise, PDFLinkService, PDFOutlineView, PDFAttachmentView,
           OverlayManager, PDFFindController, PDFFindBar, getVisibleElements,
           watchScroll, PDFViewer, PDFRenderingQueue, PresentationModeState,
           parseQueryString, RenderingStates, UNKNOWN_SCALE,
           DEFAULT_SCALE_VALUE, IGNORE_CURRENT_POSITION_ON_ZOOM: true */

'use strict';

var DEFAULT_URL = 'compressed.tracemonkey-pldi-09.pdf';
var DEFAULT_SCALE_DELTA = 1.1;
var MIN_SCALE = 0.25;
var MAX_SCALE = 10.0;
var VIEW_HISTORY_MEMORY = 20;
var SCALE_SELECT_CONTAINER_PADDING = 8;
var SCALE_SELECT_PADDING = 22;
var PAGE_NUMBER_LOADING_INDICATOR = 'visiblePageIsLoading';
var DISABLE_AUTO_FETCH_LOADING_BAR_TIMEOUT = 5000;

PDFJS.imageResourcesPath = './images/';
//#if (FIREFOX || MOZCENTRAL || GENERIC || CHROME)
//PDFJS.workerSrc = '../build/pdf.worker.js';
//#endif
//#if !PRODUCTION
PDFJS.cMapUrl = '../external/bcmaps/';
PDFJS.cMapPacked = true;
//#else
//PDFJS.cMapUrl = '../web/cmaps/';
//PDFJS.cMapPacked = true;
//#endif

var mozL10n = document.mozL10n || document.webL10n;

//#include ui_utils.js
//#include preferences.js

//#if !(FIREFOX || MOZCENTRAL)
//#include mozPrintCallback_polyfill.js
//#endif

//#if GENERIC || CHROME
//#include download_manager.js
//#endif

//#if FIREFOX || MOZCENTRAL
//#include firefoxcom.js
//#endif

//#if CHROME
//#include chromecom.js
//#endif

//#include view_history.js
//#include pdf_find_bar.js
//#include pdf_find_controller.js
//#include pdf_link_service.js
//#include pdf_history.js
//#include secondary_toolbar.js
//#include pdf_presentation_mode.js
//#include hand_tool.js
//#include overlay_manager.js
//#include password_prompt.js
//#include pdf_document_properties.js
//#include pdf_viewer.js
//#include pdf_thumbnail_viewer.js
//#include pdf_outline_view.js
//#include pdf_attachment_view.js

var PDFViewerApplication = {
  initialBookmark: document.location.hash.substring(1),
  initialDestination: null,
  initialized: false,
  fellback: false,
  pdfDocument: null,
  sidebarOpen: false,
  printing: false,
  /** @type {PDFViewer} */
  pdfViewer: null,
  /** @type {PDFThumbnailViewer} */
  pdfThumbnailViewer: null,
  /** @type {PDFRenderingQueue} */
  pdfRenderingQueue: null,
  /** @type {PDFPresentationMode} */
  pdfPresentationMode: null,
  /** @type {PDFDocumentProperties} */
  pdfDocumentProperties: null,
  /** @type {PDFLinkService} */
  pdfLinkService: null,
  /** @type {PDFHistory} */
  pdfHistory: null,
  pageRotation: 0,
  updateScaleControls: true,
  isInitialViewSet: false,
  animationStartedPromise: null,
  preferenceSidebarViewOnLoad: SidebarView.NONE,
  preferencePdfBugEnabled: false,
  preferenceShowPreviousViewOnLoad: true,
  preferenceDefaultZoomValue: '',
  isViewerEmbedded: (window.parent !== window),
  url: '',

  // called once when the document is loaded
  initialize: function pdfViewInitialize() {
    var pdfRenderingQueue = new PDFRenderingQueue();
    pdfRenderingQueue.onIdle = this.cleanup.bind(this);
    this.pdfRenderingQueue = pdfRenderingQueue;

    var pdfLinkService = new PDFLinkService();
    this.pdfLinkService = pdfLinkService;

    var container = document.getElementById('viewerContainer');
    var viewer = document.getElementById('viewer');
    this.pdfViewer = new PDFViewer({
      container: container,
      viewer: viewer,
      renderingQueue: pdfRenderingQueue,
      linkService: pdfLinkService
    });
    pdfRenderingQueue.setViewer(this.pdfViewer);
    pdfLinkService.setViewer(this.pdfViewer);

    var thumbnailContainer = document.getElementById('thumbnailView');
    this.pdfThumbnailViewer = new PDFThumbnailViewer({
      container: thumbnailContainer,
      renderingQueue: pdfRenderingQueue,
      linkService: pdfLinkService
    });
    pdfRenderingQueue.setThumbnailViewer(this.pdfThumbnailViewer);

    Preferences.initialize();

    this.pdfHistory = new PDFHistory({
      linkService: pdfLinkService
    });
    pdfLinkService.setHistory(this.pdfHistory);

    this.findController = new PDFFindController({
      pdfViewer: this.pdfViewer,
      integratedFind: this.supportsIntegratedFind
    });
    this.pdfViewer.setFindController(this.findController);

    this.findBar = new PDFFindBar({
      bar: document.getElementById('findbar'),
      toggleButton: document.getElementById('viewFind'),
      findField: document.getElementById('findInput'),
      highlightAllCheckbox: document.getElementById('findHighlightAll'),
      caseSensitiveCheckbox: document.getElementById('findMatchCase'),
      findMsg: document.getElementById('findMsg'),
      findStatusIcon: document.getElementById('findStatusIcon'),
      findPreviousButton: document.getElementById('findPrevious'),
      findNextButton: document.getElementById('findNext'),
      findController: this.findController
    });

    this.findController.setFindBar(this.findBar);

    HandTool.initialize({
      container: container,
      toggleHandTool: document.getElementById('toggleHandTool')
    });

    this.pdfDocumentProperties = new PDFDocumentProperties({
      overlayName: 'documentPropertiesOverlay',
      closeButton: document.getElementById('documentPropertiesClose'),
      fields: {
        'fileName': document.getElementById('fileNameField'),
        'fileSize': document.getElementById('fileSizeField'),
        'title': document.getElementById('titleField'),
        'author': document.getElementById('authorField'),
        'subject': document.getElementById('subjectField'),
        'keywords': document.getElementById('keywordsField'),
        'creationDate': document.getElementById('creationDateField'),
        'modificationDate': document.getElementById('modificationDateField'),
        'creator': document.getElementById('creatorField'),
        'producer': document.getElementById('producerField'),
        'version': document.getElementById('versionField'),
        'pageCount': document.getElementById('pageCountField')
      }
    });

    SecondaryToolbar.initialize({
      toolbar: document.getElementById('secondaryToolbar'),
      toggleButton: document.getElementById('secondaryToolbarToggle'),
      presentationModeButton:
        document.getElementById('secondaryPresentationMode'),
      openFile: document.getElementById('secondaryOpenFile'),
      print: document.getElementById('secondaryPrint'),
      download: document.getElementById('secondaryDownload'),
      viewBookmark: document.getElementById('secondaryViewBookmark'),
      firstPage: document.getElementById('firstPage'),
      lastPage: document.getElementById('lastPage'),
      pageRotateCw: document.getElementById('pageRotateCw'),
      pageRotateCcw: document.getElementById('pageRotateCcw'),
      documentPropertiesButton: document.getElementById('documentProperties')
    });

    if (this.supportsFullscreen) {
      var toolbar = SecondaryToolbar;
      this.pdfPresentationMode = new PDFPresentationMode({
        container: container,
        viewer: viewer,
        pdfViewer: this.pdfViewer,
        pdfThumbnailViewer: this.pdfThumbnailViewer,
        contextMenuItems: [
          { element: document.getElementById('contextFirstPage'),
            handler: toolbar.firstPageClick.bind(toolbar) },
          { element: document.getElementById('contextLastPage'),
            handler: toolbar.lastPageClick.bind(toolbar) },
          { element: document.getElementById('contextPageRotateCw'),
            handler: toolbar.pageRotateCwClick.bind(toolbar) },
          { element: document.getElementById('contextPageRotateCcw'),
            handler: toolbar.pageRotateCcwClick.bind(toolbar) }
        ]
      });
    }

    PasswordPrompt.initialize({
      overlayName: 'passwordOverlay',
      passwordField: document.getElementById('password'),
      passwordText: document.getElementById('passwordText'),
      passwordSubmit: document.getElementById('passwordSubmit'),
      passwordCancel: document.getElementById('passwordCancel')
    });

    var self = this;
    var initializedPromise = Promise.all([
      Preferences.get('enableWebGL').then(function resolved(value) {
        PDFJS.disableWebGL = !value;
      }),
      Preferences.get('sidebarViewOnLoad').then(function resolved(value) {
        self.preferenceSidebarViewOnLoad = value;
      }),
      Preferences.get('pdfBugEnabled').then(function resolved(value) {
        self.preferencePdfBugEnabled = value;
      }),
      Preferences.get('showPreviousViewOnLoad').then(function resolved(value) {
        self.preferenceShowPreviousViewOnLoad = value;
      }),
      Preferences.get('defaultZoomValue').then(function resolved(value) {
        self.preferenceDefaultZoomValue = value;
      }),
      Preferences.get('disableTextLayer').then(function resolved(value) {
        if (PDFJS.disableTextLayer === true) {
          return;
        }
        PDFJS.disableTextLayer = value;
      }),
      Preferences.get('disableRange').then(function resolved(value) {
        if (PDFJS.disableRange === true) {
          return;
        }
        PDFJS.disableRange = value;
      }),
      Preferences.get('disableAutoFetch').then(function resolved(value) {
        PDFJS.disableAutoFetch = value;
      }),
      Preferences.get('disableFontFace').then(function resolved(value) {
        if (PDFJS.disableFontFace === true) {
          return;
        }
        PDFJS.disableFontFace = value;
      }),
      Preferences.get('useOnlyCssZoom').then(function resolved(value) {
        PDFJS.useOnlyCssZoom = value;
      })
      // TODO move more preferences and other async stuff here
    ]).catch(function (reason) { });

    return initializedPromise.then(function () {
      PDFViewerApplication.initialized = true;
    });
  },

  zoomIn: function pdfViewZoomIn(ticks) {
    var newScale = this.pdfViewer.currentScale;
    do {
      newScale = (newScale * DEFAULT_SCALE_DELTA).toFixed(2);
      newScale = Math.ceil(newScale * 10) / 10;
      newScale = Math.min(MAX_SCALE, newScale);
    } while (--ticks > 0 && newScale < MAX_SCALE);
    this.setScale(newScale, true);
  },

  zoomOut: function pdfViewZoomOut(ticks) {
    var newScale = this.pdfViewer.currentScale;
    do {
      newScale = (newScale / DEFAULT_SCALE_DELTA).toFixed(2);
      newScale = Math.floor(newScale * 10) / 10;
      newScale = Math.max(MIN_SCALE, newScale);
    } while (--ticks > 0 && newScale > MIN_SCALE);
    this.setScale(newScale, true);
  },

  get currentScaleValue() {
    return this.pdfViewer.currentScaleValue;
  },

  get pagesCount() {
    return this.pdfDocument.numPages;
  },

  set page(val) {
    this.pdfLinkService.page = val;
  },

  get page() { // TODO remove
    return this.pdfLinkService.page;
  },

  get supportsPrinting() {
    var canvas = document.createElement('canvas');
    var value = 'mozPrintCallback' in canvas;

    return PDFJS.shadow(this, 'supportsPrinting', value);
  },

  get supportsFullscreen() {
    var doc = document.documentElement;
    var support = !!(doc.requestFullscreen || doc.mozRequestFullScreen ||
                     doc.webkitRequestFullScreen || doc.msRequestFullscreen);

    if (document.fullscreenEnabled === false ||
        document.mozFullScreenEnabled === false ||
        document.webkitFullscreenEnabled === false ||
        document.msFullscreenEnabled === false) {
      support = false;
    }
    if (support && PDFJS.disableFullscreen === true) {
      support = false;
    }

    return PDFJS.shadow(this, 'supportsFullscreen', support);
  },

  get supportsIntegratedFind() {
    var support = false;
//#if (FIREFOX || MOZCENTRAL)
//  support = FirefoxCom.requestSync('supportsIntegratedFind');
//#endif

    return PDFJS.shadow(this, 'supportsIntegratedFind', support);
  },

  get supportsDocumentFonts() {
    var support = true;
//#if (FIREFOX || MOZCENTRAL)
//  support = FirefoxCom.requestSync('supportsDocumentFonts');
//#endif

    return PDFJS.shadow(this, 'supportsDocumentFonts', support);
  },

  get supportsDocumentColors() {
    var support = true;
//#if (FIREFOX || MOZCENTRAL)
//  support = FirefoxCom.requestSync('supportsDocumentColors');
//#endif

    return PDFJS.shadow(this, 'supportsDocumentColors', support);
  },

  get loadingBar() {
    var bar = new ProgressBar('#loadingBar', {});

    return PDFJS.shadow(this, 'loadingBar', bar);
  },

//#if (FIREFOX || MOZCENTRAL)
  initPassiveLoading: function pdfViewInitPassiveLoading() {
    function FirefoxComDataRangeTransport(length, initialData) {
      PDFJS.PDFDataRangeTransport.call(this, length, initialData);
    }
    FirefoxComDataRangeTransport.prototype =
      Object.create(PDFJS.PDFDataRangeTransport.prototype);
    FirefoxComDataRangeTransport.prototype.requestDataRange =
        function FirefoxComDataRangeTransport_requestDataRange(begin, end) {
      FirefoxCom.request('requestDataRange', { begin: begin, end: end });
    };

    var pdfDataRangeTransport;

    window.addEventListener('message', function windowMessage(e) {
      if (e.source !== null) {
        // The message MUST originate from Chrome code.
        console.warn('Rejected untrusted message from ' + e.origin);
        return;
      }
      var args = e.data;

      if (typeof args !== 'object' || !('pdfjsLoadAction' in args)) {
        return;
      }
      switch (args.pdfjsLoadAction) {
        case 'supportsRangedLoading':
          pdfDataRangeTransport =
            new FirefoxComDataRangeTransport(args.length, args.data);

          PDFViewerApplication.open(args.pdfUrl, 0, undefined,
                                    pdfDataRangeTransport);

          if (args.length) {
            PDFViewerApplication.pdfDocumentProperties
                                .setFileSize(args.length);
          }
          break;
        case 'range':
          pdfDataRangeTransport.onDataRange(args.begin, args.chunk);
          break;
        case 'rangeProgress':
          pdfDataRangeTransport.onDataProgress(args.loaded);
          break;
        case 'progressiveRead':
          pdfDataRangeTransport.onDataProgressiveRead(args.chunk);
          break;
        case 'progress':
          PDFViewerApplication.progress(args.loaded / args.total);
          break;
        case 'complete':
          if (!args.data) {
            PDFViewerApplication.error(mozL10n.get('loading_error', null,
              'An error occurred while loading the PDF.'), e);
            break;
          }
          PDFViewerApplication.open(args.data, 0);
          break;
      }
    });
    FirefoxCom.requestSync('initPassiveLoading', null);
  },
//#endif

  setTitleUsingUrl: function pdfViewSetTitleUsingUrl(url) {
    this.url = url;
    try {
      this.setTitle(decodeURIComponent(getFileName(url)) || url);
    } catch (e) {
      // decodeURIComponent may throw URIError,
      // fall back to using the unprocessed url in that case
      this.setTitle(url);
    }
  },

  setTitle: function pdfViewSetTitle(title) {
    if (this.isViewerEmbedded) {
      // Embedded PDF viewers should not be changing their parent page's title.
      return;
    }
    document.title = title;
  },

  close: function pdfViewClose() {
    var errorWrapper = document.getElementById('errorWrapper');
    errorWrapper.setAttribute('hidden', 'true');

    if (!this.pdfDocument) {
      return;
    }

    this.pdfDocument.destroy();
    this.pdfDocument = null;

    this.pdfThumbnailViewer.setDocument(null);
    this.pdfViewer.setDocument(null);
    this.pdfLinkService.setDocument(null, null);

    if (typeof PDFBug !== 'undefined') {
      PDFBug.cleanup();
    }
  },

  // TODO(mack): This function signature should really be pdfViewOpen(url, args)
  open: function pdfViewOpen(file, scale, password,
                             pdfDataRangeTransport, args) {
    if (this.pdfDocument) {
      // Reload the preferences if a document was previously opened.
      Preferences.reload();
    }
    this.close();

    var parameters = {password: password};
    if (typeof file === 'string') { // URL
      this.setTitleUsingUrl(file);
      parameters.url = file;
    } else if (file && 'byteLength' in file) { // ArrayBuffer
      parameters.data = file;
    } else if (file.url && file.originalUrl) {
      this.setTitleUsingUrl(file.originalUrl);
      parameters.url = file.url;
    }
    if (args) {
      for (var prop in args) {
        parameters[prop] = args[prop];
      }
    }

    var self = this;
    self.downloadComplete = false;

    var passwordNeeded = function passwordNeeded(updatePassword, reason) {
      PasswordPrompt.updatePassword = updatePassword;
      PasswordPrompt.reason = reason;
      PasswordPrompt.open();
    };

    function getDocumentProgress(progressData) {
      self.progress(progressData.loaded / progressData.total);
    }

    PDFJS.getDocument(parameters, pdfDataRangeTransport, passwordNeeded,
                      getDocumentProgress).then(
      function getDocumentCallback(pdfDocument) {
        self.load(pdfDocument, scale);
      },
      function getDocumentError(exception) {
        var message = exception && exception.message;
        var loadingErrorMessage = mozL10n.get('loading_error', null,
          'An error occurred while loading the PDF.');

        if (exception instanceof PDFJS.InvalidPDFException) {
          // change error message also for other builds
          loadingErrorMessage = mozL10n.get('invalid_file_error', null,
                                            'Invalid or corrupted PDF file.');
        } else if (exception instanceof PDFJS.MissingPDFException) {
          // special message for missing PDF's
          loadingErrorMessage = mozL10n.get('missing_file_error', null,
                                            'Missing PDF file.');
        } else if (exception instanceof PDFJS.UnexpectedResponseException) {
          loadingErrorMessage = mozL10n.get('unexpected_response_error', null,
                                            'Unexpected server response.');
        }

        var moreInfo = {
          message: message
        };
        self.error(loadingErrorMessage, moreInfo);
      }
    );

    if (args && args.length) {
      PDFViewerApplication.pdfDocumentProperties.setFileSize(args.length);
    }
  },

  download: function pdfViewDownload() {
    function downloadByUrl() {
      downloadManager.downloadUrl(url, filename);
    }

    var url = this.url.split('#')[0];
    var filename = getPDFFileNameFromURL(url);
    var downloadManager = new DownloadManager();
    downloadManager.onerror = function (err) {
      // This error won't really be helpful because it's likely the
      // fallback won't work either (or is already open).
      PDFViewerApplication.error('PDF failed to download.');
    };

    if (!this.pdfDocument) { // the PDF is not ready yet
      downloadByUrl();
      return;
    }

    if (!this.downloadComplete) { // the PDF is still downloading
      downloadByUrl();
      return;
    }

    this.pdfDocument.getData().then(
      function getDataSuccess(data) {
        var blob = PDFJS.createBlob(data, 'application/pdf');
        downloadManager.download(blob, url, filename);
      },
      downloadByUrl // Error occurred try downloading with just the url.
    ).then(null, downloadByUrl);
  },

  fallback: function pdfViewFallback(featureId) {
//#if !PRODUCTION
    if (true) {
      return;
    }
//#endif
//#if (FIREFOX || MOZCENTRAL)
    // Only trigger the fallback once so we don't spam the user with messages
    // for one PDF.
    if (this.fellback) {
      return;
    }
    this.fellback = true;
    var url = this.url.split('#')[0];
    FirefoxCom.request('fallback', { featureId: featureId, url: url },
      function response(download) {
        if (!download) {
          return;
        }
        PDFViewerApplication.download();
      });
//#endif
  },

  /**
   * Show the error box.
   * @param {String} message A message that is human readable.
   * @param {Object} moreInfo (optional) Further information about the error
   *                            that is more technical.  Should have a 'message'
   *                            and optionally a 'stack' property.
   */
  error: function pdfViewError(message, moreInfo) {
    var moreInfoText = mozL10n.get('error_version_info',
      {version: PDFJS.version || '?', build: PDFJS.build || '?'},
      'PDF.js v{{version}} (build: {{build}})') + '\n';
    if (moreInfo) {
      moreInfoText +=
        mozL10n.get('error_message', {message: moreInfo.message},
        'Message: {{message}}');
      if (moreInfo.stack) {
        moreInfoText += '\n' +
          mozL10n.get('error_stack', {stack: moreInfo.stack},
          'Stack: {{stack}}');
      } else {
        if (moreInfo.filename) {
          moreInfoText += '\n' +
            mozL10n.get('error_file', {file: moreInfo.filename},
            'File: {{file}}');
        }
        if (moreInfo.lineNumber) {
          moreInfoText += '\n' +
            mozL10n.get('error_line', {line: moreInfo.lineNumber},
            'Line: {{line}}');
        }
      }
    }

//#if !(FIREFOX || MOZCENTRAL)
    var errorWrapper = document.getElementById('errorWrapper');
    errorWrapper.removeAttribute('hidden');

    var errorMessage = document.getElementById('errorMessage');
    errorMessage.textContent = message;

    var closeButton = document.getElementById('errorClose');
    closeButton.onclick = function() {
      errorWrapper.setAttribute('hidden', 'true');
    };

    var errorMoreInfo = document.getElementById('errorMoreInfo');
    var moreInfoButton = document.getElementById('errorShowMore');
    var lessInfoButton = document.getElementById('errorShowLess');
    moreInfoButton.onclick = function() {
      errorMoreInfo.removeAttribute('hidden');
      moreInfoButton.setAttribute('hidden', 'true');
      lessInfoButton.removeAttribute('hidden');
      errorMoreInfo.style.height = errorMoreInfo.scrollHeight + 'px';
    };
    lessInfoButton.onclick = function() {
      errorMoreInfo.setAttribute('hidden', 'true');
      moreInfoButton.removeAttribute('hidden');
      lessInfoButton.setAttribute('hidden', 'true');
    };
    moreInfoButton.oncontextmenu = noContextMenuHandler;
    lessInfoButton.oncontextmenu = noContextMenuHandler;
    closeButton.oncontextmenu = noContextMenuHandler;
    moreInfoButton.removeAttribute('hidden');
    lessInfoButton.setAttribute('hidden', 'true');
    errorMoreInfo.value = moreInfoText;
//#else
//  console.error(message + '\n' + moreInfoText);
//  this.fallback();
//#endif
  },

  progress: function pdfViewProgress(level) {
    var percent = Math.round(level * 100);
    // When we transition from full request to range requests, it's possible
    // that we discard some of the loaded data. This can cause the loading
    // bar to move backwards. So prevent this by only updating the bar if it
    // increases.
    if (percent > this.loadingBar.percent || isNaN(percent)) {
      this.loadingBar.percent = percent;

      // When disableAutoFetch is enabled, it's not uncommon for the entire file
      // to never be fetched (depends on e.g. the file structure). In this case
      // the loading bar will not be completely filled, nor will it be hidden.
      // To prevent displaying a partially filled loading bar permanently, we
      // hide it when no data has been loaded during a certain amount of time.
      if (PDFJS.disableAutoFetch && percent) {
        if (this.disableAutoFetchLoadingBarTimeout) {
          clearTimeout(this.disableAutoFetchLoadingBarTimeout);
          this.disableAutoFetchLoadingBarTimeout = null;
        }
        this.loadingBar.show();

        this.disableAutoFetchLoadingBarTimeout = setTimeout(function () {
          this.loadingBar.hide();
          this.disableAutoFetchLoadingBarTimeout = null;
        }.bind(this), DISABLE_AUTO_FETCH_LOADING_BAR_TIMEOUT);
      }
    }
  },

  load: function pdfViewLoad(pdfDocument, scale) {
    var self = this;
    scale = scale || UNKNOWN_SCALE;

    this.findController.reset();

    this.pdfDocument = pdfDocument;

    this.pdfDocumentProperties.setDocumentAndUrl(pdfDocument, this.url);

    var downloadedPromise = pdfDocument.getDownloadInfo().then(function() {
      self.downloadComplete = true;
      self.loadingBar.hide();
    });

    var pagesCount = pdfDocument.numPages;
    document.getElementById('numPages').textContent =
      mozL10n.get('page_of', {pageCount: pagesCount}, '/ {{pageCount}}');
    document.getElementById('pageNumber').max = pagesCount;

    var id = this.documentFingerprint = pdfDocument.fingerprint;
    var store = this.store = new ViewHistory(id);

//#if GENERIC
    var baseDocumentUrl = null;
//#endif
//#if (FIREFOX || MOZCENTRAL)
//  var baseDocumentUrl = this.url.split('#')[0];
//#endif
//#if CHROME
//  var baseDocumentUrl = location.href.split('#')[0];
//#endif
    this.pdfLinkService.setDocument(pdfDocument, baseDocumentUrl);

    var pdfViewer = this.pdfViewer;
    pdfViewer.currentScale = scale;
    pdfViewer.setDocument(pdfDocument);
    var firstPagePromise = pdfViewer.firstPagePromise;
    var pagesPromise = pdfViewer.pagesPromise;
    var onePageRendered = pdfViewer.onePageRendered;

    this.pageRotation = 0;
    this.isInitialViewSet = false;

    this.pdfThumbnailViewer.setDocument(pdfDocument);

    firstPagePromise.then(function(pdfPage) {
      downloadedPromise.then(function () {
        var event = document.createEvent('CustomEvent');
        event.initCustomEvent('documentload', true, true, {});
        window.dispatchEvent(event);
      });

      self.loadingBar.setWidth(document.getElementById('viewer'));

      if (!PDFJS.disableHistory && !self.isViewerEmbedded) {
        // The browsing history is only enabled when the viewer is standalone,
        // i.e. not when it is embedded in a web page.
        if (!self.preferenceShowPreviousViewOnLoad) {
          self.pdfHistory.clearHistoryState();
        }
        self.pdfHistory.initialize(self.documentFingerprint);

        if (self.pdfHistory.initialDestination) {
          self.initialDestination = self.pdfHistory.initialDestination;
        } else if (self.pdfHistory.initialBookmark) {
          self.initialBookmark = self.pdfHistory.initialBookmark;
        }
      }

      store.initializedPromise.then(function resolved() {
        var storedHash = null;
        if (self.preferenceShowPreviousViewOnLoad &&
            store.get('exists', false)) {
          var pageNum = store.get('page', '1');
          var zoom = self.preferenceDefaultZoomValue ||
                     store.get('zoom', self.pdfViewer.currentScale);
          var left = store.get('scrollLeft', '0');
          var top = store.get('scrollTop', '0');

          storedHash = 'page=' + pageNum + '&zoom=' + zoom + ',' +
                       left + ',' + top;
        } else if (self.preferenceDefaultZoomValue) {
          storedHash = 'page=1&zoom=' + self.preferenceDefaultZoomValue;
        }
        self.setInitialView(storedHash, scale);

        // Make all navigation keys work on document load,
        // unless the viewer is embedded in a web page.
        if (!self.isViewerEmbedded) {
          self.pdfViewer.focus();
        }
      }, function rejected(reason) {
        console.error(reason);
        self.setInitialView(null, scale);
      });
    });

    pagesPromise.then(function() {
      if (self.supportsPrinting) {
        pdfDocument.getJavaScript().then(function(javaScript) {
          if (javaScript.length) {
            console.warn('Warning: JavaScript is not supported');
            self.fallback(PDFJS.UNSUPPORTED_FEATURES.javaScript);
          }
          // Hack to support auto printing.
          var regex = /\bprint\s*\(/g;
          for (var i = 0, ii = javaScript.length; i < ii; i++) {
            var js = javaScript[i];
            if (js && regex.test(js)) {
              setTimeout(function() {
                window.print();
              });
              return;
            }
          }
        });
      }
    });

    // outline depends on pagesRefMap
    var promises = [pagesPromise, this.animationStartedPromise];
    Promise.all(promises).then(function() {
      pdfDocument.getOutline().then(function(outline) {
        var container = document.getElementById('outlineView');
        self.outline = new PDFOutlineView({
          container: container,
          outline: outline,
          linkService: self.pdfLinkService
        });
        self.outline.render();
        document.getElementById('viewOutline').disabled = !outline;

        if (!outline && !container.classList.contains('hidden')) {
          self.switchSidebarView('thumbs');
        }
        if (outline &&
            self.preferenceSidebarViewOnLoad === SidebarView.OUTLINE) {
          self.switchSidebarView('outline', true);
        }
      });
      pdfDocument.getAttachments().then(function(attachments) {
        var container = document.getElementById('attachmentsView');
        self.attachments = new PDFAttachmentView({
          container: container,
          attachments: attachments,
          downloadManager: new DownloadManager()
        });
        self.attachments.render();
        document.getElementById('viewAttachments').disabled = !attachments;

        if (!attachments && !container.classList.contains('hidden')) {
          self.switchSidebarView('thumbs');
        }
        if (attachments &&
            self.preferenceSidebarViewOnLoad === SidebarView.ATTACHMENTS) {
          self.switchSidebarView('attachments', true);
        }
      });
    });

    if (self.preferenceSidebarViewOnLoad === SidebarView.THUMBS) {
      Promise.all([firstPagePromise, onePageRendered]).then(function () {
        self.switchSidebarView('thumbs', true);
      });
    }

    pdfDocument.getMetadata().then(function(data) {
      var info = data.info, metadata = data.metadata;
      self.documentInfo = info;
      self.metadata = metadata;

      // Provides some basic debug information
      console.log('PDF ' + pdfDocument.fingerprint + ' [' +
                  info.PDFFormatVersion + ' ' + (info.Producer || '-').trim() +
                  ' / ' + (info.Creator || '-').trim() + ']' +
                  ' (PDF.js: ' + (PDFJS.version || '-') +
                  (!PDFJS.disableWebGL ? ' [WebGL]' : '') + ')');

      var pdfTitle;
      if (metadata && metadata.has('dc:title')) {
        var title = metadata.get('dc:title');
        // Ghostscript sometimes return 'Untitled', sets the title to 'Untitled'
        if (title !== 'Untitled') {
          pdfTitle = title;
        }
      }

      if (!pdfTitle && info && info['Title']) {
        pdfTitle = info['Title'];
      }

      if (pdfTitle) {
        self.setTitle(pdfTitle + ' - ' + document.title);
      }

      if (info.IsAcroFormPresent) {
        console.warn('Warning: AcroForm/XFA is not supported');
        self.fallback(PDFJS.UNSUPPORTED_FEATURES.forms);
      }

//#if !PRODUCTION
      if (true) {
        return;
      }
//#endif
//#if (FIREFOX || MOZCENTRAL)
      var versionId = String(info.PDFFormatVersion).slice(-1) | 0;
      var generatorId = 0;
      var KNOWN_GENERATORS = [
        'acrobat distiller', 'acrobat pdfwriter', 'adobe livecycle',
        'adobe pdf library', 'adobe photoshop', 'ghostscript', 'tcpdf',
        'cairo', 'dvipdfm', 'dvips', 'pdftex', 'pdfkit', 'itext', 'prince',
        'quarkxpress', 'mac os x', 'microsoft', 'openoffice', 'oracle',
        'luradocument', 'pdf-xchange', 'antenna house', 'aspose.cells', 'fpdf'
      ];
      if (info.Producer) {
        KNOWN_GENERATORS.some(function (generator, s, i) {
          if (generator.indexOf(s) < 0) {
            return false;
          }
          generatorId = i + 1;
          return true;
        }.bind(null, info.Producer.toLowerCase()));
      }
      var formType = !info.IsAcroFormPresent ? null : info.IsXFAPresent ?
                     'xfa' : 'acroform';
      FirefoxCom.request('reportTelemetry', JSON.stringify({
        type: 'documentInfo',
        version: versionId,
        generator: generatorId,
        formType: formType
      }));
//#endif
    });
  },

  setInitialView: function pdfViewSetInitialView(storedHash, scale) {
    this.isInitialViewSet = true;

    // When opening a new file (when one is already loaded in the viewer):
    // Reset 'currentPageNumber', since otherwise the page's scale will be wrong
    // if 'currentPageNumber' is larger than the number of pages in the file.
    document.getElementById('pageNumber').value =
      this.pdfViewer.currentPageNumber = 1;

    if (this.initialDestination) {
      this.pdfLinkService.navigateTo(this.initialDestination);
      this.initialDestination = null;
    } else if (this.initialBookmark) {
      this.pdfLinkService.setHash(this.initialBookmark);
      this.pdfHistory.push({ hash: this.initialBookmark }, true);
      this.initialBookmark = null;
    } else if (storedHash) {
      this.pdfLinkService.setHash(storedHash);
    } else if (scale) {
      this.setScale(scale, true);
      this.page = 1;
    }

    if (!this.pdfViewer.currentScaleValue) {
      // Scale was not initialized: invalid bookmark or scale was not specified.
      // Setting the default one.
      this.setScale(DEFAULT_SCALE_VALUE, true);
    }
  },

  cleanup: function pdfViewCleanup() {
    this.pdfViewer.cleanup();
    this.pdfThumbnailViewer.cleanup();
    this.pdfDocument.cleanup();
  },

  forceRendering: function pdfViewForceRendering() {
    this.pdfRenderingQueue.printing = this.printing;
    this.pdfRenderingQueue.isThumbnailViewEnabled = this.sidebarOpen;
    this.pdfRenderingQueue.renderHighestPriority();
  },

  refreshThumbnailViewer: function pdfViewRefreshThumbnailViewer() {
    var pdfViewer = this.pdfViewer;
    var thumbnailViewer = this.pdfThumbnailViewer;

    // set thumbnail images of rendered pages
    var pagesCount = pdfViewer.pagesCount;
    for (var pageIndex = 0; pageIndex < pagesCount; pageIndex++) {
      var pageView = pdfViewer.getPageView(pageIndex);
      if (pageView && pageView.renderingState === RenderingStates.FINISHED) {
        var thumbnailView = thumbnailViewer.getThumbnail(pageIndex);
        thumbnailView.setImage(pageView);
      }
    }

    thumbnailViewer.scrollThumbnailIntoView(this.page);
  },

  switchSidebarView: function pdfViewSwitchSidebarView(view, openSidebar) {
    if (openSidebar && !this.sidebarOpen) {
      document.getElementById('sidebarToggle').click();
    }
    var thumbsView = document.getElementById('thumbnailView');
    var outlineView = document.getElementById('outlineView');
    var attachmentsView = document.getElementById('attachmentsView');

    var thumbsButton = document.getElementById('viewThumbnail');
    var outlineButton = document.getElementById('viewOutline');
    var attachmentsButton = document.getElementById('viewAttachments');

    switch (view) {
      case 'thumbs':
        var wasAnotherViewVisible = thumbsView.classList.contains('hidden');

        thumbsButton.classList.add('toggled');
        outlineButton.classList.remove('toggled');
        attachmentsButton.classList.remove('toggled');
        thumbsView.classList.remove('hidden');
        outlineView.classList.add('hidden');
        attachmentsView.classList.add('hidden');

        this.forceRendering();

        if (wasAnotherViewVisible) {
          this.pdfThumbnailViewer.ensureThumbnailVisible(this.page);
        }
        break;

      case 'outline':
        thumbsButton.classList.remove('toggled');
        outlineButton.classList.add('toggled');
        attachmentsButton.classList.remove('toggled');
        thumbsView.classList.add('hidden');
        outlineView.classList.remove('hidden');
        attachmentsView.classList.add('hidden');

        if (outlineButton.getAttribute('disabled')) {
          return;
        }
        break;

      case 'attachments':
        thumbsButton.classList.remove('toggled');
        outlineButton.classList.remove('toggled');
        attachmentsButton.classList.add('toggled');
        thumbsView.classList.add('hidden');
        outlineView.classList.add('hidden');
        attachmentsView.classList.remove('hidden');

        if (attachmentsButton.getAttribute('disabled')) {
          return;
        }
        break;
    }
  },

  beforePrint: function pdfViewSetupBeforePrint() {
    if (!this.supportsPrinting) {
      var printMessage = mozL10n.get('printing_not_supported', null,
          'Warning: Printing is not fully supported by this browser.');
      this.error(printMessage);
      return;
    }

    var alertNotReady = false;
    var i, ii;
    if (!this.pdfDocument || !this.pagesCount) {
      alertNotReady = true;
    } else {
      for (i = 0, ii = this.pagesCount; i < ii; ++i) {
        if (!this.pdfViewer.getPageView(i).pdfPage) {
          alertNotReady = true;
          break;
        }
      }
    }
    if (alertNotReady) {
      var notReadyMessage = mozL10n.get('printing_not_ready', null,
          'Warning: The PDF is not fully loaded for printing.');
      window.alert(notReadyMessage);
      return;
    }

    this.printing = true;
    this.forceRendering();

    var body = document.querySelector('body');
    body.setAttribute('data-mozPrintCallback', true);

    if (!this.hasEqualPageSizes) {
      console.warn('Not all pages have the same size. The printed result ' +
          'may be incorrect!');
    }

    // Insert a @page + size rule to make sure that the page size is correctly
    // set. Note that we assume that all pages have the same size, because
    // variable-size pages are not supported yet (at least in Chrome & Firefox).
    // TODO(robwu): Use named pages when size calculation bugs get resolved
    // (e.g. https://crbug.com/355116) AND when support for named pages is
    // added (http://www.w3.org/TR/css3-page/#using-named-pages).
    // In browsers where @page + size is not supported (such as Firefox,
    // https://bugzil.la/851441), the next stylesheet will be ignored and the
    // user has to select the correct paper size in the UI if wanted.
    this.pageStyleSheet = document.createElement('style');
    var pageSize = this.pdfViewer.getPageView(0).pdfPage.getViewport(1);
    this.pageStyleSheet.textContent =
      // "size:<width> <height>" is what we need. But also add "A4" because
      // Firefox incorrectly reports support for the other value.
      '@supports ((size:A4) and (size:1pt 1pt)) {' +
      '@page { size: ' + pageSize.width + 'pt ' + pageSize.height + 'pt;}' +
      // The canvas and each ancestor node must have a height of 100% to make
      // sure that each canvas is printed on exactly one page.
      '#printContainer {height:100%}' +
      '#printContainer > div {width:100% !important;height:100% !important;}' +
      '}';
    body.appendChild(this.pageStyleSheet);

    for (i = 0, ii = this.pagesCount; i < ii; ++i) {
      this.pdfViewer.getPageView(i).beforePrint();
    }

//#if !PRODUCTION
    if (true) {
      return;
    }
//#endif
//#if (FIREFOX || MOZCENTRAL)
    FirefoxCom.request('reportTelemetry', JSON.stringify({
      type: 'print'
    }));
//#endif
  },

  // Whether all pages of the PDF have the same width and height.
  get hasEqualPageSizes() {
    var firstPage = this.pdfViewer.getPageView(0);
    for (var i = 1, ii = this.pagesCount; i < ii; ++i) {
      var pageView = this.pdfViewer.getPageView(i);
      if (pageView.width !== firstPage.width ||
          pageView.height !== firstPage.height) {
        return false;
      }
    }
    return true;
  },

  afterPrint: function pdfViewSetupAfterPrint() {
    var div = document.getElementById('printContainer');
    while (div.hasChildNodes()) {
      div.removeChild(div.lastChild);
    }

    if (this.pageStyleSheet && this.pageStyleSheet.parentNode) {
      this.pageStyleSheet.parentNode.removeChild(this.pageStyleSheet);
      this.pageStyleSheet = null;
    }

    this.printing = false;
    this.forceRendering();
  },

  setScale: function (value, resetAutoSettings) {
    this.updateScaleControls = !!resetAutoSettings;
    this.pdfViewer.currentScaleValue = value;
    this.updateScaleControls = true;
  },

  rotatePages: function pdfViewRotatePages(delta) {
    var pageNumber = this.page;
    this.pageRotation = (this.pageRotation + 360 + delta) % 360;
    this.pdfViewer.pagesRotation = this.pageRotation;
    this.pdfThumbnailViewer.pagesRotation = this.pageRotation;

    this.forceRendering();

    this.pdfViewer.scrollPageIntoView(pageNumber);
  },

  requestPresentationMode: function pdfViewRequestPresentationMode() {
    if (!this.pdfPresentationMode) {
      return;
    }
    this.pdfPresentationMode.request();
  },

  /**
   * @param {number} delta - The delta value from the mouse event.
   */
  scrollPresentationMode: function pdfViewScrollPresentationMode(delta) {
    if (!this.pdfPresentationMode) {
      return;
    }
    this.pdfPresentationMode.mouseScroll(delta);
  }
};
//#if GENERIC
window.PDFView = PDFViewerApplication; // obsolete name, using it as an alias
//#endif

//#if CHROME
//(function rewriteUrlClosure() {
//  // Run this code outside DOMContentLoaded to make sure that the URL
//  // is rewritten as soon as possible.
//  var queryString = document.location.search.slice(1);
//  var params = parseQueryString(queryString);
//  DEFAULT_URL = params.file || '';
//
//  // Example: chrome-extension://.../http://example.com/file.pdf
//  var humanReadableUrl = '/' + DEFAULT_URL + location.hash;
//  history.replaceState(history.state, '', humanReadableUrl);
//  if (top === window) {
//    chrome.runtime.sendMessage('showPageAction');
//  }
//})();
//#endif

function webViewerLoad(evt) {
  PDFViewerApplication.initialize().then(webViewerInitialized);
}

function webViewerInitialized() {
//#if GENERIC
  var queryString = document.location.search.substring(1);
  var params = parseQueryString(queryString);

  var file = 'file' in params ? base64decode(params.file) : DEFAULT_URL;

//#endif
//#if (FIREFOX || MOZCENTRAL)
//var file = window.location.href.split('#')[0];
//#endif
//#if CHROME
//var file = DEFAULT_URL;
//#endif

//#if GENERIC
  var fileInput = document.createElement('input');
  fileInput.id = 'fileInput';
  fileInput.className = 'fileInput';
  fileInput.setAttribute('type', 'file');
  fileInput.oncontextmenu = noContextMenuHandler;
  document.body.appendChild(fileInput);

  if (!window.File || !window.FileReader || !window.FileList || !window.Blob) {
    document.getElementById('openFile').setAttribute('hidden', 'true');
    document.getElementById('secondaryOpenFile').setAttribute('hidden', 'true');
  } else {
    document.getElementById('fileInput').value = null;
  }
//#else
//document.getElementById('openFile').setAttribute('hidden', 'true');
//document.getElementById('secondaryOpenFile').setAttribute('hidden', 'true');
//#endif

//#if !(FIREFOX || MOZCENTRAL)
  var locale = PDFJS.locale || navigator.language;
//#endif

//#if !PRODUCTION
  if (true) {
//#else
//if (PDFViewerApplication.preferencePdfBugEnabled) {
//#endif
    // Special debugging flags in the hash section of the URL.
    var hash = document.location.hash.substring(1);
    var hashParams = parseQueryString(hash);

    if ('disableworker' in hashParams) {
      PDFJS.disableWorker = (hashParams['disableworker'] === 'true');
    }
    if ('disablerange' in hashParams) {
      PDFJS.disableRange = (hashParams['disablerange'] === 'true');
    }
    if ('disablestream' in hashParams) {
      PDFJS.disableStream = (hashParams['disablestream'] === 'true');
    }
    if ('disableautofetch' in hashParams) {
      PDFJS.disableAutoFetch = (hashParams['disableautofetch'] === 'true');
    }
    if ('disablefontface' in hashParams) {
      PDFJS.disableFontFace = (hashParams['disablefontface'] === 'true');
    }
    if ('disablehistory' in hashParams) {
      PDFJS.disableHistory = (hashParams['disablehistory'] === 'true');
    }
    if ('webgl' in hashParams) {
      PDFJS.disableWebGL = (hashParams['webgl'] !== 'true');
    }
    if ('useonlycsszoom' in hashParams) {
      PDFJS.useOnlyCssZoom = (hashParams['useonlycsszoom'] === 'true');
    }
    if ('verbosity' in hashParams) {
      PDFJS.verbosity = hashParams['verbosity'] | 0;
    }
    if ('ignorecurrentpositiononzoom' in hashParams) {
      IGNORE_CURRENT_POSITION_ON_ZOOM =
        (hashParams['ignorecurrentpositiononzoom'] === 'true');
    }
//#if !PRODUCTION
    if ('disablebcmaps' in hashParams && hashParams['disablebcmaps']) {
      PDFJS.cMapUrl = '../external/cmaps/';
      PDFJS.cMapPacked = false;
    }
//#endif
//#if !(FIREFOX || MOZCENTRAL)
    if ('locale' in hashParams) {
      locale = hashParams['locale'];
    }
//#endif
    if ('textlayer' in hashParams) {
      switch (hashParams['textlayer']) {
        case 'off':
          PDFJS.disableTextLayer = true;
          break;
        case 'visible':
        case 'shadow':
        case 'hover':
          var viewer = document.getElementById('viewer');
          viewer.classList.add('textLayer-' + hashParams['textlayer']);
          break;
      }
    }
    if ('pdfbug' in hashParams) {
      PDFJS.pdfBug = true;
      var pdfBug = hashParams['pdfbug'];
      var enabled = pdfBug.split(',');
      PDFBug.enable(enabled);
      PDFBug.init();
    }
  }

//#if !(FIREFOX || MOZCENTRAL)
  mozL10n.setLanguage(locale);
//#endif
//#if (FIREFOX || MOZCENTRAL)
  if (!PDFViewerApplication.supportsDocumentFonts) {
    PDFJS.disableFontFace = true;
    console.warn(mozL10n.get('web_fonts_disabled', null,
      'Web fonts are disabled: unable to use embedded PDF fonts.'));
  }
//#endif

  if (!PDFViewerApplication.supportsPrinting) {
    document.getElementById('print').classList.add('hidden');
    document.getElementById('secondaryPrint').classList.add('hidden');
  }

  if (!PDFViewerApplication.supportsFullscreen) {
    document.getElementById('presentationMode').classList.add('hidden');
    document.getElementById('secondaryPresentationMode').
      classList.add('hidden');
  }

  if (PDFViewerApplication.supportsIntegratedFind) {
    document.getElementById('viewFind').classList.add('hidden');
  }

  // Listen for unsupported features to trigger the fallback UI.
  PDFJS.UnsupportedManager.listen(
    PDFViewerApplication.fallback.bind(PDFViewerApplication));

  // Suppress context menus for some controls
  document.getElementById('scaleSelect').oncontextmenu = noContextMenuHandler;

  var mainContainer = document.getElementById('mainContainer');
  var outerContainer = document.getElementById('outerContainer');
  mainContainer.addEventListener('transitionend', function(e) {
    if (e.target === mainContainer) {
      var event = document.createEvent('UIEvents');
      event.initUIEvent('resize', false, false, window, 0);
      window.dispatchEvent(event);
      outerContainer.classList.remove('sidebarMoving');
    }
  }, true);

  document.getElementById('sidebarToggle').addEventListener('click',
    function() {
      this.classList.toggle('toggled');
      outerContainer.classList.add('sidebarMoving');
      outerContainer.classList.toggle('sidebarOpen');
      PDFViewerApplication.sidebarOpen =
        outerContainer.classList.contains('sidebarOpen');
      if (PDFViewerApplication.sidebarOpen) {
        PDFViewerApplication.refreshThumbnailViewer();
      }
      PDFViewerApplication.forceRendering();
    });

  document.getElementById('viewThumbnail').addEventListener('click',
    function() {
      PDFViewerApplication.switchSidebarView('thumbs');
    });

  document.getElementById('viewOutline').addEventListener('click',
    function() {
      PDFViewerApplication.switchSidebarView('outline');
    });

  document.getElementById('viewAttachments').addEventListener('click',
    function() {
      PDFViewerApplication.switchSidebarView('attachments');
    });

  document.getElementById('previous').addEventListener('click',
    function() {
      PDFViewerApplication.page--;
    });

  document.getElementById('next').addEventListener('click',
    function() {
      PDFViewerApplication.page++;
    });

  document.getElementById('zoomIn').addEventListener('click',
    function() {
      PDFViewerApplication.zoomIn();
    });

  document.getElementById('zoomOut').addEventListener('click',
    function() {
      PDFViewerApplication.zoomOut();
    });

  document.getElementById('pageNumber').addEventListener('click', function() {
    this.select();
  });

  document.getElementById('pageNumber').addEventListener('change', function() {
    // Handle the user inputting a floating point number.
    PDFViewerApplication.page = (this.value | 0);

    if (this.value !== (this.value | 0).toString()) {
      this.value = PDFViewerApplication.page;
    }
  });

  document.getElementById('scaleSelect').addEventListener('change',
    function() {
      PDFViewerApplication.setScale(this.value, false);
    });

  document.getElementById('presentationMode').addEventListener('click',
    SecondaryToolbar.presentationModeClick.bind(SecondaryToolbar));

  document.getElementById('openFile').addEventListener('click',
    SecondaryToolbar.openFileClick.bind(SecondaryToolbar));

  document.getElementById('print').addEventListener('click',
    SecondaryToolbar.printClick.bind(SecondaryToolbar));

  document.getElementById('download').addEventListener('click',
    SecondaryToolbar.downloadClick.bind(SecondaryToolbar));

//#if (FIREFOX || MOZCENTRAL)
//PDFViewerApplication.setTitleUsingUrl(file);
//PDFViewerApplication.initPassiveLoading();
//return;
//#endif

//#if GENERIC
  if (file && file.lastIndexOf('file:', 0) === 0) {
    // file:-scheme. Load the contents in the main thread because QtWebKit
    // cannot load file:-URLs in a Web Worker. file:-URLs are usually loaded
    // very quickly, so there is no need to set up progress event listeners.
    PDFViewerApplication.setTitleUsingUrl(file);
    var xhr = new XMLHttpRequest();
    xhr.onload = function() {
      PDFViewerApplication.open(new Uint8Array(xhr.response), 0);
    };
    try {
      xhr.open('GET', file);
      xhr.responseType = 'arraybuffer';
      xhr.send();
    } catch (e) {
      PDFViewerApplication.error(mozL10n.get('loading_error', null,
        'An error occurred while loading the PDF.'), e);
    }
    return;
  }

  if (file) {
    PDFViewerApplication.open(file, 0);
  }
//#endif
//#if CHROME
//if (file) {
//  ChromeCom.openPDFFile(file);
//}
//#endif
}

document.addEventListener('DOMContentLoaded', webViewerLoad, true);

document.addEventListener('pagerendered', function (e) {
  var pageNumber = e.detail.pageNumber;
  var pageIndex = pageNumber - 1;
  var pageView = PDFViewerApplication.pdfViewer.getPageView(pageIndex);

  if (PDFViewerApplication.sidebarOpen) {
    var thumbnailView = PDFViewerApplication.pdfThumbnailViewer.
                        getThumbnail(pageIndex);
    thumbnailView.setImage(pageView);
  }

  if (PDFJS.pdfBug && Stats.enabled && pageView.stats) {
    Stats.add(pageNumber, pageView.stats);
  }

  if (pageView.error) {
    PDFViewerApplication.error(mozL10n.get('rendering_error', null,
      'An error occurred while rendering the page.'), pageView.error);
  }

  // If the page is still visible when it has finished rendering,
  // ensure that the page number input loading indicator is hidden.
  if (pageNumber === PDFViewerApplication.page) {
    var pageNumberInput = document.getElementById('pageNumber');
    pageNumberInput.classList.remove(PAGE_NUMBER_LOADING_INDICATOR);
  }

//#if !PRODUCTION
  if (true) {
    return;
  }
//#endif
//#if (FIREFOX || MOZCENTRAL)
  FirefoxCom.request('reportTelemetry', JSON.stringify({
    type: 'pageInfo'
  }));
  // It is a good time to report stream and font types.
  PDFViewerApplication.pdfDocument.getStats().then(function (stats) {
    FirefoxCom.request('reportTelemetry', JSON.stringify({
      type: 'documentStats',
      stats: stats
    }));
  });
//#endif
}, true);

document.addEventListener('textlayerrendered', function (e) {
  var pageIndex = e.detail.pageNumber - 1;
  var pageView = PDFViewerApplication.pdfViewer.getPageView(pageIndex);

//#if !PRODUCTION
  if (true) {
    return;
  }
//#endif
//#if (FIREFOX || MOZCENTRAL)
  if (pageView.textLayer && pageView.textLayer.textDivs &&
      pageView.textLayer.textDivs.length > 0 &&
      !PDFViewerApplication.supportsDocumentColors) {
    console.error(mozL10n.get('document_colors_disabled', null,
      'PDF documents are not allowed to use their own colors: ' +
      '\'Allow pages to choose their own colors\' ' +
      'is deactivated in the browser.'));
    PDFViewerApplication.fallback();
  }
//#endif
}, true);

document.addEventListener('namedaction', function (e) {
  // Processing couple of named actions that might be useful.
  // See also PDFLinkService.executeNamedAction
  var action = e.action;
  switch (action) {
    case 'GoToPage':
      document.getElementById('pageNumber').focus();
      break;

    case 'Find':
      if (!this.supportsIntegratedFind) {
        this.findBar.toggle();
      }
      break;
  }
}, true);

window.addEventListener('presentationmodechanged', function (e) {
  var active = e.detail.active;
  var switchInProgress = e.detail.switchInProgress;
  PDFViewerApplication.pdfViewer.presentationModeState =
    switchInProgress ? PresentationModeState.CHANGING :
    active ? PresentationModeState.FULLSCREEN : PresentationModeState.NORMAL;
});

function updateViewarea() {
  if (!PDFViewerApplication.initialized) {
    return;
  }
  PDFViewerApplication.pdfViewer.update();
}

window.addEventListener('updateviewarea', function (evt) {
  if (!PDFViewerApplication.initialized) {
    return;
  }
  var location = evt.location;

  PDFViewerApplication.store.initializedPromise.then(function() {
    PDFViewerApplication.store.setMultiple({
      'exists': true,
      'page': location.pageNumber,
      'zoom': location.scale,
      'scrollLeft': location.left,
      'scrollTop': location.top
    }).catch(function() {
      // unable to write to storage
    });
  });
  var href =
    PDFViewerApplication.pdfLinkService.getAnchorUrl(location.pdfOpenParams);
  document.getElementById('viewBookmark').href = href;
  document.getElementById('secondaryViewBookmark').href = href;

  // Update the current bookmark in the browsing history.
  PDFViewerApplication.pdfHistory.updateCurrentBookmark(location.pdfOpenParams,
                                                        location.pageNumber);

  // Show/hide the loading indicator in the page number input element.
  var pageNumberInput = document.getElementById('pageNumber');
  var currentPage =
    PDFViewerApplication.pdfViewer.getPageView(PDFViewerApplication.page - 1);

  if (currentPage.renderingState === RenderingStates.FINISHED) {
    pageNumberInput.classList.remove(PAGE_NUMBER_LOADING_INDICATOR);
  } else {
    pageNumberInput.classList.add(PAGE_NUMBER_LOADING_INDICATOR);
  }
}, true);

window.addEventListener('resize', function webViewerResize(evt) {
  if (PDFViewerApplication.initialized &&
      (document.getElementById('pageAutoOption').selected ||
       /* Note: the scale is constant for |pageActualOption|. */
       document.getElementById('pageFitOption').selected ||
       document.getElementById('pageWidthOption').selected)) {
    var selectedScale = document.getElementById('scaleSelect').value;
    PDFViewerApplication.setScale(selectedScale, false);
  }
  updateViewarea();

  // Set the 'max-height' CSS property of the secondary toolbar.
  SecondaryToolbar.setMaxHeight(document.getElementById('viewerContainer'));
});

window.addEventListener('hashchange', function webViewerHashchange(evt) {
  if (PDFViewerApplication.pdfHistory.isHashChangeUnlocked) {
    var hash = document.location.hash.substring(1);
    if (!hash) {
      return;
    }
    if (!PDFViewerApplication.isInitialViewSet) {
      PDFViewerApplication.initialBookmark = hash;
    } else {
      PDFViewerApplication.pdfLinkService.setHash(hash);
    }
  }
});

//#if GENERIC
window.addEventListener('change', function webViewerChange(evt) {
  var files = evt.target.files;
  if (!files || files.length === 0) {
    return;
  }
  var file = files[0];

  if (!PDFJS.disableCreateObjectURL &&
      typeof URL !== 'undefined' && URL.createObjectURL) {
    PDFViewerApplication.open(URL.createObjectURL(file), 0);
  } else {
    // Read the local file into a Uint8Array.
    var fileReader = new FileReader();
    fileReader.onload = function webViewerChangeFileReaderOnload(evt) {
      var buffer = evt.target.result;
      var uint8Array = new Uint8Array(buffer);
      PDFViewerApplication.open(uint8Array, 0);
    };
    fileReader.readAsArrayBuffer(file);
  }

  PDFViewerApplication.setTitleUsingUrl(file.name);

  // URL does not reflect proper document location - hiding some icons.
  document.getElementById('viewBookmark').setAttribute('hidden', 'true');
  document.getElementById('secondaryViewBookmark').
    setAttribute('hidden', 'true');
  document.getElementById('download').setAttribute('hidden', 'true');
  document.getElementById('secondaryDownload').setAttribute('hidden', 'true');
}, true);
//#endif

function selectScaleOption(value) {
  var options = document.getElementById('scaleSelect').options;
  var predefinedValueFound = false;
  for (var i = 0; i < options.length; i++) {
    var option = options[i];
    if (option.value !== value) {
      option.selected = false;
      continue;
    }
    option.selected = true;
    predefinedValueFound = true;
  }
  return predefinedValueFound;
}

window.addEventListener('localized', function localized(evt) {
  document.getElementsByTagName('html')[0].dir = mozL10n.getDirection();

  PDFViewerApplication.animationStartedPromise.then(function() {
    // Adjust the width of the zoom box to fit the content.
    // Note: If the window is narrow enough that the zoom box is not visible,
    //       we temporarily show it to be able to adjust its width.
    var container = document.getElementById('scaleSelectContainer');
    if (container.clientWidth === 0) {
      container.setAttribute('style', 'display: inherit;');
    }
    if (container.clientWidth > 0) {
      var select = document.getElementById('scaleSelect');
      select.setAttribute('style', 'min-width: inherit;');
      var width = select.clientWidth + SCALE_SELECT_CONTAINER_PADDING;
      select.setAttribute('style', 'min-width: ' +
                                   (width + SCALE_SELECT_PADDING) + 'px;');
      container.setAttribute('style', 'min-width: ' + width + 'px; ' +
                                      'max-width: ' + width + 'px;');
    }

    // Set the 'max-height' CSS property of the secondary toolbar.
    SecondaryToolbar.setMaxHeight(document.getElementById('viewerContainer'));
  });
}, true);

window.addEventListener('scalechange', function scalechange(evt) {
  document.getElementById('zoomOut').disabled = (evt.scale === MIN_SCALE);
  document.getElementById('zoomIn').disabled = (evt.scale === MAX_SCALE);

  var customScaleOption = document.getElementById('customScaleOption');
  customScaleOption.selected = false;

  if (!PDFViewerApplication.updateScaleControls &&
      (document.getElementById('pageAutoOption').selected ||
       document.getElementById('pageActualOption').selected ||
       document.getElementById('pageFitOption').selected ||
       document.getElementById('pageWidthOption').selected)) {
    updateViewarea();
    return;
  }

  if (evt.presetValue) {
    selectScaleOption(evt.presetValue);
    updateViewarea();
    return;
  }

  var predefinedValueFound = selectScaleOption('' + evt.scale);
  if (!predefinedValueFound) {
    var customScale = Math.round(evt.scale * 10000) / 100;
    customScaleOption.textContent =
      mozL10n.get('page_scale_percent', { scale: customScale }, '{{scale}}%');
    customScaleOption.selected = true;
  }
  updateViewarea();
}, true);

window.addEventListener('pagechange', function pagechange(evt) {
  var page = evt.pageNumber;
  if (evt.previousPageNumber !== page) {
    document.getElementById('pageNumber').value = page;
    if (PDFViewerApplication.sidebarOpen) {
      PDFViewerApplication.pdfThumbnailViewer.scrollThumbnailIntoView(page);
    }
  }
  var numPages = PDFViewerApplication.pagesCount;

  document.getElementById('previous').disabled = (page <= 1);
  document.getElementById('next').disabled = (page >= numPages);

  document.getElementById('firstPage').disabled = (page <= 1);
  document.getElementById('lastPage').disabled = (page >= numPages);

  // we need to update stats
  if (PDFJS.pdfBug && Stats.enabled) {
    var pageView = PDFViewerApplication.pdfViewer.getPageView(page - 1);
    if (pageView.stats) {
      Stats.add(page, pageView.stats);
    }
  }
}, true);

function handleMouseWheel(evt) {
  var MOUSE_WHEEL_DELTA_FACTOR = 40;
  var ticks = (evt.type === 'DOMMouseScroll') ? -evt.detail :
              evt.wheelDelta / MOUSE_WHEEL_DELTA_FACTOR;
  var direction = (ticks < 0) ? 'zoomOut' : 'zoomIn';

  var pdfViewer = PDFViewerApplication.pdfViewer;
  if (pdfViewer.isInPresentationMode) {
    evt.preventDefault();
    PDFViewerApplication.scrollPresentationMode(ticks *
                                                MOUSE_WHEEL_DELTA_FACTOR);
  } else if (evt.ctrlKey || evt.metaKey) {
    // Only zoom the pages, not the entire viewer.
    evt.preventDefault();

    var previousScale = pdfViewer.currentScale;

    PDFViewerApplication[direction](Math.abs(ticks));

    var currentScale = pdfViewer.currentScale;
    if (previousScale !== currentScale) {
      // After scaling the page via zoomIn/zoomOut, the position of the upper-
      // left corner is restored. When the mouse wheel is used, the position
      // under the cursor should be restored instead.
      var scaleCorrectionFactor = currentScale / previousScale - 1;
      var rect = pdfViewer.container.getBoundingClientRect();
      var dx = evt.clientX - rect.left;
      var dy = evt.clientY - rect.top;
      pdfViewer.container.scrollLeft += dx * scaleCorrectionFactor;
      pdfViewer.container.scrollTop += dy * scaleCorrectionFactor;
    }
  }
}

window.addEventListener('DOMMouseScroll', handleMouseWheel);
window.addEventListener('mousewheel', handleMouseWheel);

window.addEventListener('click', function click(evt) {
  if (SecondaryToolbar.opened &&
      PDFViewerApplication.pdfViewer.containsElement(evt.target)) {
    SecondaryToolbar.close();
  }
}, false);

window.addEventListener('keydown', function keydown(evt) {
  if (OverlayManager.active) {
    return;
  }

  var handled = false;
  var cmd = (evt.ctrlKey ? 1 : 0) |
            (evt.altKey ? 2 : 0) |
            (evt.shiftKey ? 4 : 0) |
            (evt.metaKey ? 8 : 0);

  var pdfViewer = PDFViewerApplication.pdfViewer;
  var isViewerInPresentationMode = pdfViewer && pdfViewer.isInPresentationMode;

  // First, handle the key bindings that are independent whether an input
  // control is selected or not.
  if (cmd === 1 || cmd === 8 || cmd === 5 || cmd === 12) {
    // either CTRL or META key with optional SHIFT.
    switch (evt.keyCode) {
      case 70: // f
        if (!PDFViewerApplication.supportsIntegratedFind) {
          PDFViewerApplication.findBar.open();
          handled = true;
        }
        break;
      case 71: // g
        if (!PDFViewerApplication.supportsIntegratedFind) {
          PDFViewerApplication.findBar.dispatchEvent('again',
                                                     cmd === 5 || cmd === 12);
          handled = true;
        }
        break;
      case 61: // FF/Mac '='
      case 107: // FF '+' and '='
      case 187: // Chrome '+'
      case 171: // FF with German keyboard
        if (!isViewerInPresentationMode) {
          PDFViewerApplication.zoomIn();
        }
        handled = true;
        break;
      case 173: // FF/Mac '-'
      case 109: // FF '-'
      case 189: // Chrome '-'
        if (!isViewerInPresentationMode) {
          PDFViewerApplication.zoomOut();
        }
        handled = true;
        break;
      case 48: // '0'
      case 96: // '0' on Numpad of Swedish keyboard
        if (!isViewerInPresentationMode) {
          // keeping it unhandled (to restore page zoom to 100%)
          setTimeout(function () {
            // ... and resetting the scale after browser adjusts its scale
            PDFViewerApplication.setScale(DEFAULT_SCALE_VALUE, true);
          });
          handled = false;
        }
        break;
    }
  }

//#if !(FIREFOX || MOZCENTRAL)
  // CTRL or META without shift
  if (cmd === 1 || cmd === 8) {
    switch (evt.keyCode) {
      case 83: // s
        PDFViewerApplication.download();
        handled = true;
        break;
    }
  }
//#endif

  // CTRL+ALT or Option+Command
  if (cmd === 3 || cmd === 10) {
    switch (evt.keyCode) {
      case 80: // p
        PDFViewerApplication.requestPresentationMode();
        handled = true;
        break;
      case 71: // g
        // focuses input#pageNumber field
        document.getElementById('pageNumber').select();
        handled = true;
        break;
    }
  }

  if (handled) {
    evt.preventDefault();
    return;
  }

  // Some shortcuts should not get handled if a control/input element
  // is selected.
  var curElement = document.activeElement || document.querySelector(':focus');
  var curElementTagName = curElement && curElement.tagName.toUpperCase();
  if (curElementTagName === 'INPUT' ||
      curElementTagName === 'TEXTAREA' ||
      curElementTagName === 'SELECT') {
    // Make sure that the secondary toolbar is closed when Escape is pressed.
    if (evt.keyCode !== 27) { // 'Esc'
      return;
    }
  }

  if (cmd === 0) { // no control key pressed at all.
    switch (evt.keyCode) {
      case 38: // up arrow
      case 33: // pg up
      case 8: // backspace
        if (!isViewerInPresentationMode &&
            PDFViewerApplication.currentScaleValue !== 'page-fit') {
          break;
        }
        /* in presentation mode */
        /* falls through */
      case 37: // left arrow
        // horizontal scrolling using arrow keys
        if (pdfViewer.isHorizontalScrollbarEnabled) {
          break;
        }
        /* falls through */
      case 75: // 'k'
      case 80: // 'p'
        PDFViewerApplication.page--;
        handled = true;
        break;
      case 27: // esc key
        if (SecondaryToolbar.opened) {
          SecondaryToolbar.close();
          handled = true;
        }
        if (!PDFViewerApplication.supportsIntegratedFind &&
            PDFViewerApplication.findBar.opened) {
          PDFViewerApplication.findBar.close();
          handled = true;
        }
        break;
      case 40: // down arrow
      case 34: // pg down
      case 32: // spacebar
        if (!isViewerInPresentationMode &&
            PDFViewerApplication.currentScaleValue !== 'page-fit') {
          break;
        }
        /* falls through */
      case 39: // right arrow
        // horizontal scrolling using arrow keys
        if (pdfViewer.isHorizontalScrollbarEnabled) {
          break;
        }
        /* falls through */
      case 74: // 'j'
      case 78: // 'n'
        PDFViewerApplication.page++;
        handled = true;
        break;

      case 36: // home
        if (isViewerInPresentationMode || PDFViewerApplication.page > 1) {
          PDFViewerApplication.page = 1;
          handled = true;
        }
        break;
      case 35: // end
        if (isViewerInPresentationMode || (PDFViewerApplication.pdfDocument &&
            PDFViewerApplication.page < PDFViewerApplication.pagesCount)) {
          PDFViewerApplication.page = PDFViewerApplication.pagesCount;
          handled = true;
        }
        break;

      case 72: // 'h'
        if (!isViewerInPresentationMode) {
          HandTool.toggle();
        }
        break;
      case 82: // 'r'
        PDFViewerApplication.rotatePages(90);
        break;
    }
  }

  if (cmd === 4) { // shift-key
    switch (evt.keyCode) {
      case 32: // spacebar
        if (!isViewerInPresentationMode &&
            PDFViewerApplication.currentScaleValue !== 'page-fit') {
          break;
        }
        PDFViewerApplication.page--;
        handled = true;
        break;

      case 82: // 'r'
        PDFViewerApplication.rotatePages(-90);
        break;
    }
  }

  if (!handled && !isViewerInPresentationMode) {
    // 33=Page Up  34=Page Down  35=End    36=Home
    // 37=Left     38=Up         39=Right  40=Down
    if (evt.keyCode >= 33 && evt.keyCode <= 40 &&
        !pdfViewer.containsElement(curElement)) {
      // The page container is not focused, but a page navigation key has been
      // pressed. Change the focus to the viewer container to make sure that
      // navigation by keyboard works as expected.
      pdfViewer.focus();
    }
    // 32=Spacebar
    if (evt.keyCode === 32 && curElementTagName !== 'BUTTON' &&
        !pdfViewer.containsElement(curElement)) {
      pdfViewer.focus();
    }
  }

  if (cmd === 2) { // alt-key
    switch (evt.keyCode) {
      case 37: // left arrow
        if (isViewerInPresentationMode) {
          PDFViewerApplication.pdfHistory.back();
          handled = true;
        }
        break;
      case 39: // right arrow
        if (isViewerInPresentationMode) {
          PDFViewerApplication.pdfHistory.forward();
          handled = true;
        }
        break;
    }
  }

  if (handled) {
    evt.preventDefault();
  }
});

window.addEventListener('beforeprint', function beforePrint(evt) {
  PDFViewerApplication.beforePrint();
});

window.addEventListener('afterprint', function afterPrint(evt) {
  PDFViewerApplication.afterPrint();
});

(function animationStartedClosure() {
  // The offsetParent is not set until the pdf.js iframe or object is visible.
  // Waiting for first animation.
  PDFViewerApplication.animationStartedPromise = new Promise(
      function (resolve) {
    window.requestAnimationFrame(resolve);
  });
})();








var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64DecodeChars = new Array(-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
                                              -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
                                              -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57,
                                              58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6,
                                              7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
                                              25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
                                              37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1,
                                              -1, -1);

function base64encode(str) {
    var out, i, len;
    var c1, c2, c3;
    len = str.length;
    i = 0;
    out = "";

    while (i < len) {
        c1 = str.charCodeAt(i++) & 0xff;

        if (i == len) {
            out += base64EncodeChars.charAt(c1 >> 2);
            out += base64EncodeChars.charAt((c1 & 0x3) << 4);
            out += "==";
            break
        }

        c2 = str.charCodeAt(i++);

        if (i == len) {
            out += base64EncodeChars.charAt(c1 >> 2);
            out += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
            out += base64EncodeChars.charAt((c2 & 0xF) << 2);
            out += "=";
            break
        }

        c3 = str.charCodeAt(i++);
        out += base64EncodeChars.charAt(c1 >> 2);
        out += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
        out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6));
        out += base64EncodeChars.charAt(c3 & 0x3F)
    }

    return out
}

function base64decode(str) {
    var c1, c2, c3, c4;
    var i, len, out;
    len = str.length;
    i = 0;
    out = "";

    while (i < len) {
        do {
            c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff]
        } while (i < len && c1 == -1);

        if (c1 == -1)
            break;

        do {
            c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff]
        } while (i < len && c2 == -1);

        if (c2 == -1)
            break;

        out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));

        do {
            c3 = str.charCodeAt(i++) & 0xff;

            if (c3 == 61)
                return out;

            c3 = base64DecodeChars[c3]
        } while (i < len && c3 == -1);

        if (c3 == -1)
            break;

        out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));

        do {
            c4 = str.charCodeAt(i++) & 0xff;

            if (c4 == 61)
                return out;

            c4 = base64DecodeChars[c4]
        } while (i < len && c4 == -1);

        if (c4 == -1)
            break;

        out += String.fromCharCode(((c3 & 0x03) << 6) | c4)
    }

    return out
}