include/util.js

   1 /*
   2  * noVNC: HTML5 VNC client
   3  * Copyright (C) 2010 Joel Martin
   4  * Licensed under LGPL-3 (see LICENSE.LGPL-3)
   5  *
   6  * See README.md for usage and integration instructions.
   7  */
   8
   9 "use strict";
  10 /*jslint bitwise: false, white: false */
  11 /*global window, document, navigator, ActiveXObject*/
  12
  13 // Globals defined here
  14 var Util = {}, $;
  15
  16 if ((!window.console) || (! /__debug__$/i.test(document.location.href))) {
  17     // non-debug mode, an empty function
  18     window.console = window.console || {};
  19     window.console.log = function (message) {};
  20     window.console.warn = function (message) {};
  21     window.console.error = function (message) {};
  22 }
  23
  24 // Simple DOM selector by ID
  25 if (!window.$) {
  26     $ = function (id) {
  27         if (document.getElementById) {
  28             return document.getElementById(id);
  29         } else if (document.all) {
  30             return document.all[id];
  31         } else if (document.layers) {
  32             return document.layers[id];
  33         }
  34         return undefined;
  35     };
  36 }
  37
  38 /*
  39  * Make arrays quack
  40  */
  41
  42 Array.prototype.shift8 = function () {
  43     return this.shift();
  44 };
  45 Array.prototype.push8 = function (num) {
  46     this.push(num & 0xFF);
  47 };
  48
  49 Array.prototype.shift16 = function () {
  50     return (this.shift() << 8) +
  51            (this.shift()     );
  52 };
  53 Array.prototype.push16 = function (num) {
  54     this.push((num >> 8) & 0xFF,
  55               (num     ) & 0xFF  );
  56 };
  57
  58
  59 Array.prototype.shift32 = function () {
  60     return (this.shift() << 24) +
  61            (this.shift() << 16) +
  62            (this.shift() <<  8) +
  63            (this.shift()      );
  64 };
  65 Array.prototype.get32 = function (off) {
  66     return (this[off    ] << 24) +
  67            (this[off + 1] << 16) +
  68            (this[off + 2] <<  8) +
  69            (this[off + 3]      );
  70 };
  71 Array.prototype.push32 = function (num) {
  72     this.push((num >> 24) & 0xFF,
  73               (num >> 16) & 0xFF,
  74               (num >>  8) & 0xFF,
  75               (num      ) & 0xFF  );
  76 };
  77
  78 Array.prototype.shiftStr = function (len) {
  79     var arr = this.splice(0, len);
  80     return arr.map(function (num) {
  81             return String.fromCharCode(num); } ).join('');
  82 };
  83 Array.prototype.pushStr = function (str) {
  84     var i, n = str.length;
  85     for (i=0; i < n; i+=1) {
  86         this.push(str.charCodeAt(i));
  87     }
  88 };
  89
  90 Array.prototype.shiftBytes = function (len) {
  91     return this.splice(0, len);
  92 };
  93
  94 /*
  95  * ------------------------------------------------------
  96  * Namespaced in Util
  97  * ------------------------------------------------------
  98  */
  99
 100 Util.dirObj = function (obj, depth, parent) {
 101     var i, msg = "", val = "";
 102     if (! depth) { depth=2; }
 103     if (! parent) { parent= ""; }
 104
 105     // Print the properties of the passed-in object
 106     for (i in obj) {
 107         if ((depth > 1) && (typeof obj[i] === "object")) {
 108             // Recurse attributes that are objects
 109             msg += Util.dirObj(obj[i], depth-1, parent + "." + i);
 110         } else {
 111             //val = new String(obj[i]).replace("\n", " ");
 112             val = obj[i].toString().replace("\n", " ");
 113             if (val.length > 30) {
 114                 val = val.substr(0,30) + "...";
 115             }
 116             msg += parent + "." + i + ": " + val + "\n";
 117         }
 118     }
 119     return msg;
 120 };
 121
 122 /*
 123  * Cross-browser routines
 124  */
 125
 126 // Get DOM element position on page
 127 Util.getPosition = function (obj) {
 128     var x = 0, y = 0;
 129     if (obj.offsetParent) {
 130         do {
 131             x += obj.offsetLeft;
 132             y += obj.offsetTop;
 133             obj = obj.offsetParent;
 134         } while (obj);
 135     }
 136     return {'x': x, 'y': y};
 137 };
 138
 139 // Get mouse event position in DOM element
 140 Util.getEventPosition = function (e, obj) {
 141     var evt, docX, docY, pos;
 142     //if (!e) evt = window.event;
 143     evt = (e ? e : window.event);
 144     if (evt.pageX || evt.pageY) {
 145         docX = evt.pageX;
 146         docY = evt.pageY;
 147     } else if (evt.clientX || evt.clientY) {
 148         docX = evt.clientX + document.body.scrollLeft +
 149             document.documentElement.scrollLeft;
 150         docY = evt.clientY + document.body.scrollTop +
 151             document.documentElement.scrollTop;
 152     }
 153     pos = Util.getPosition(obj);
 154     return {'x': docX - pos.x, 'y': docY - pos.y};
 155 };
 156
 157
 158 // Event registration. Based on: http://www.scottandrew.com/weblog/articles/cbs-events
 159 Util.addEvent = function (obj, evType, fn){
 160     if (obj.addEventListener){
 161         obj.addEventListener(evType, fn, false);
 162         return true;
 163     } else if (obj.attachEvent){
 164         var r = obj.attachEvent("on"+evType, fn);
 165         return r;
 166     } else {
 167         throw("Handler could not be attached");
 168     }
 169 };
 170
 171 Util.removeEvent = function(obj, evType, fn){
 172     if (obj.removeEventListener){
 173         obj.removeEventListener(evType, fn, false);
 174         return true;
 175     } else if (obj.detachEvent){
 176         var r = obj.detachEvent("on"+evType, fn);
 177         return r;
 178     } else {
 179         throw("Handler could not be removed");
 180     }
 181 };
 182
 183 Util.stopEvent = function(e) {
 184     if (e.stopPropagation) { e.stopPropagation(); }
 185     else                   { e.cancelBubble = true; }
 186
 187     if (e.preventDefault)  { e.preventDefault(); }
 188     else                   { e.returnValue = false; }
 189 };
 190
 191
 192 // Set browser engine versions. Based on mootools.
 193 Util.Features = {xpath: !!(document.evaluate), air: !!(window.runtime), query: !!(document.querySelector)};
 194
 195 Util.Engine = {
 196     'presto': (function() {
 197             return (!window.opera) ? false : ((arguments.callee.caller) ? 960 : ((document.getElementsByClassName) ? 950 : 925)); }()),
 198     'trident': (function() {
 199             return (!window.ActiveXObject) ? false : ((window.XMLHttpRequest) ? ((document.querySelectorAll) ? 6 : 5) : 4); }()),
 200     'webkit': (function() {
 201             return (navigator.taintEnabled) ? false : ((Util.Features.xpath) ? ((Util.Features.query) ? 525 : 420) : 419); }()),
 202     'gecko': (function() {
 203             return (!document.getBoxObjectFor && !window.mozInnerScreenX) ? false : ((document.getElementsByClassName) ? 19 : 18); }())
 204 };
 205
 206 Util.Flash = (function(){
 207     var v, version;
 208     try {
 209         v = navigator.plugins['Shockwave Flash'].description;
 210     } catch(err1) {
 211         try {
 212             v = new ActiveXObject('ShockwaveFlash.ShockwaveFlash').GetVariable('$version');
 213         } catch(err2) {
 214             v = '0 r0';
 215         }
 216     }
 217     version = v.match(/\d+/g);
 218     return {version: parseInt(version[0] || 0 + '.' + version[1], 10) || 0, build: parseInt(version[2], 10) || 0};
 219 }());
 220
 221