btoa vs third party base64 encoder (v7)

Revision 7 of this benchmark created by Xotic750 on

Preparation HTML

<script>
/*!
 * utility v0.3.0
 * http://code.google.com/p/utility-js/
 *
 * Developed by:
 * - Xotic750
 *
 * GPL version 3 or any later version; http://www.gnu.org/copyleft/gpl.html
 */

/*jslint sub: true, maxerr: 50, maxlen: 250, indent: 4 */
/*global window,document,console,alert,jQuery,GM_getValue,GM_setValue,GM_deleteValue,GM_listValues,localStorage,sessionStorage,rison,Components */

(function utility_closure() {

    "use strict";

    ///////////////////////////
    //       Variables
    ///////////////////////////

    var core = {},
        defineProperty = Object.defineProperty,
        getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor,
        getOwnPropertyNames = Object.getOwnPropertyNames,
        hasOwnProperty = Object.prototype.hasOwnProperty,
        getPrototypeOf = Object.getPrototypeOf,
        oToString = Object.prototype.toString,
        aSlice = Array.prototype.slice,
        cNull = null,
        cUndefined;

    ///////////////////////////
    //       Utility
    ///////////////////////////

    function Utility(obj) {
        defineProperty(this, "refersTo", {
            enumerable: true,
            value: obj
        });

        return this;
    }

    ///////////////////////////
    //       utility
    ///////////////////////////

    function utility(obj) {
        switch (utility.typeOf(obj)) {
        case "object":
            if (utility.isPlainObject(obj)) {
                Utility.prototype = core.Object.prototype;
            } else {
                Utility.prototype = core.Common.prototype;
            }

            break;
        case "array":
            Utility.prototype = core.Array.prototype;
            break;
        case "function":
            Utility.prototype = core.Function.prototype;
            break;
        case "string":
            Utility.prototype = core.String.prototype;
            break;
        case "number":
            Utility.prototype = core.Number.prototype;
            break;
        case "boolean":
            Utility.prototype = core.Boolean.prototype;
            break;
        case "date":
            Utility.prototype = core.Date.prototype;
            break;
        case "regexp":
            Utility.prototype = core.RegExp.prototype;
            break;
        case "arguments":
            Utility.prototype = core.Arguments.prototype;
            break;
        case "error":
            Utility.prototype = core.Error.prototype;
            break;
        default:
            Utility.prototype = core.Common.prototype;
        }

        return new Utility(obj);
    }

    defineProperty(utility, "version", {
        value: "0.3.0"
    });

    defineProperty(utility, "inheriting", {
        value: {}
    });

    defineProperty(utility, "mixin", {
        value: function (obj, inheritFrom, keys) {
            keys.forEach(function (key) {
                defineProperty(obj, key, getOwnPropertyDescriptor(inheritFrom, key));
            });
        }
    });

    defineProperty(utility, "isUndefined", {
        value: function (obj) {
            return obj === cUndefined;
        }
    });

    defineProperty(utility, "isNull", {
        value: function (obj) {
            return obj === cNull;
        }
    });

    defineProperty(utility, "isInitialised", {
        value: function (obj) {
            return !(obj === cUndefined || obj === cNull);
        }
    });

    function generateClassIs(typeArr) {
        if (oToString.call(typeArr) !== "[object Array]" || typeArr.length < 1) {
            throw new TypeError("'typeArr' must be an array with elements");
        }

        var prop = "is" + typeArr[0];

        if (typeArr[0] === "Array") {
            defineProperty(utility, prop, {
                value: Array.isArray
            });
        } else {
            defineProperty(utility, prop, {
                value: function (obj) {
                    var matched = typeArr.some(function (type) {
                        return obj !== cUndefined && obj !== cNull && oToString.call(obj) === "[object " + type + "]";
                    });

                    return matched;
                }
            });
        }
    }

    defineProperty(utility, "classStringToType", {
        value: (function () {
            var a = ["Boolean", "Number", "String", "Function", "Array", "Date", "RegExp", "Arguments", "Error", "Object"],
                o = {};

            a.forEach(function (type) {
                o["[object " + type + "]"] = type.toLowerCase();

                generateClassIs([type]);
            });

            return o;
        }())
    });

    defineProperty(utility, "toClassString", {
        value: function (obj) {
            return oToString.call(obj);
        }
    });

    defineProperty(utility, "typeOf", {
        value: function (obj) {
            if (!utility.isInitialised(obj)) {
                return String(obj);
            }

            return utility.classStringToType[utility.toClassString(obj)] || typeof obj;
        }
    });

    defineProperty(utility, "isNumeric", {
        value: (function () {
            var rx = /^-/;

            return function (obj) {
                return (utility.isNumber(obj) || (utility.isString(obj) && obj.length > 0)) && !isNaN(parseFloat(obj)) && isFinite(obj.toString().replace(rx, ''));
            };
        }())
    });

    defineProperty(utility, "isInt", {
        value: function (obj) {
            return utility.isNumeric(obj) && parseInt(obj, 10) === parseFloat(obj);
        }
    });

    defineProperty(utility, "isCircular", {
        value: function (obj, a) {
            if (!utility.isObject(obj) && !utility.isFunction(obj)) {
                return false;
            }

            if (!utility.isArray(a)) {
                if (utility.isInitialised(a)) {
                    throw new TypeError("Expected attribute to be an array");
                }

                a = [];
            }

            a.push(obj);
            var val,
                c = Object.keys(obj).some(function (key) {
                    val = obj[key];

                    return (utility.isObject(val) || utility.isFunction(val)) && (a.indexOf(val) >= 0 || utility.isCircular(val, a));
                });

            a.pop();
            return c;
        }
    });

    defineProperty(utility, "isNativeFunction", {
        value: (function () {
            var e = "{ [native code] }",
                m = e.length;

            return function (fn) {
                return utility.isFunction(fn) && fn.toString().slice(-m) === e;
            };
        }())
    });

    defineProperty(utility, "has", {
        value: function (obj, prop) {
            return utility.isInitialised(obj) && utility.isString(prop) && prop.length > 0 && prop in obj;
        }
    });

    defineProperty(utility, "hasOwn", {
        value: function (obj, prop) {
            return utility.isInitialised(obj) && utility.isString(prop) && prop.length > 0 && hasOwnProperty.call(obj, prop);
        }
    });

    defineProperty(utility, "isDom", {
        value: (function () {
            var p = "[object HTML",
                l = p.length,
                a = ["Element", "Attr", "Text", "CDATASection", "EntityReference", "Entity", "ProcessingInstruction", "Comment", "Document", "DocumentType", "DocumentFragment", "Notation"],
                o = {};

            a.forEach(function (type) {
                o["[object " + type + "]"] = true;

                generateClassIs(["DOMType" + type]);
            });

            return function (obj) {
                var classString = utility.toClassString(obj);

                return utility.isObject(obj) && (o[classString] || classString.slice(0, l) === p);

            };
        }())
    });

    generateClassIs(["HTMLDocument"]);

    generateClassIs(["Window", "global"]);

    defineProperty(utility, "isPlainObject", {
        value: (function () {
            var o = {};

            return function (obj) {
                return utility.isObject(obj) && getPrototypeOf(obj).isPrototypeOf(o);
            };
        }())
    });

    defineProperty(utility, "isEmptyObject", {
        value: function (obj) {
            if (!utility.isPlainObject(obj)) {
                throw new TypeError("Cannot call method 'isEmptyObject' of " + utility.toClassString(obj));
            }

            return Object.keys(obj).length === 0;
        }
    });

    defineProperty(utility, "lengthOf", {
        value: function (obj) {
            if (utility.isArray(obj) || utility.isString(obj) || utility.isArguments(obj) || (utility.isObject(obj) && utility.isInitialised(obj.length))) {
                return obj.length;
            }

            if (utility.isPlainObject(obj)) {
                return Object.keys(obj).length;
            }

            throw new Error("Cannot call method 'lengthOf' of " + utility.toClassString(obj));
        }
    });

    defineProperty(utility, "hasContent", {
        value: function (obj) {
            if (!utility.isInitialised(obj)) {
                return false;
            }

            if (utility.isFunction(obj) || utility.isBoolean(obj) || utility.isWindow(obj)) {
                return true;
            }

            if (utility.isNumber(obj) || utility.isDate(obj)) {
                return isFinite(obj);
            }

            if (utility.isRegExp(obj)) {
                return utility.isString(obj.source) && obj.source.length > 0 && obj.source !== "(?:)";
            }

            if (utility.isError(obj)) {
                return utility.isString(obj.stack) && obj.stack.length > 0;
            }

            try {
                return utility.lengthOf(obj) > 0;
            } catch (e) {
                throw new Error("Cannot call method 'hasContent' of " + utility.toClassString(obj));
            }
        }
    });

    defineProperty(utility, "setContent", {
        value: function (obj, val) {
            if (utility.hasContent(obj)) {
                return obj;
            }

            return val;
        }
    });

    defineProperty(utility, "hasIndexOf", {
        value: function (obj, val) {
            return ((utility.isArray(obj) || !utility.isString(obj)) && obj.length > 0 && obj.indexOf(val) >= 0) || (utility.isPlainObject(obj) && Object.keys(obj).indexOf(val) >= 0);
        }
    });

    defineProperty(utility, "addEvent", {
        value: function addEvent(obj, type, fn) {
            if (!utility.isDom(obj) || (!utility.has(obj, "attachEvent") && !utility.has(obj, "addEventListener"))) {
                throw new TypeError("Cannot call method 'addEvent' of " + utility.toClassString(obj));
            }

            if (!utility.isString(obj) || obj.length < 1) {
                throw new TypeError("Attribute 'type' is not a valid identifier");
            }

            if (!utility.isFunction(obj)) {
                throw new TypeError("Attribute 'fn' is not a function");
            }

            if (utility.isFunction(obj, "attachEvent")) {
                obj['e' + type + fn] = fn;
                obj[type + fn] = function () {
                    obj['e' + type + fn](window.event);
                };

                obj.attachEvent('on' + type, obj[type + fn]);
            } else if (utility.isFunction(obj, "addEventListener")) {
                obj.addEventListener(type, fn, false);
            } else {
                throw new Error("unable to call method 'addEvent' of" + utility.toClassString(obj));
            }
        }
    });

    defineProperty(utility, "removeEvent", {
        value: function (obj, type, fn) {
            if (!utility.isDom(obj) || (!utility.has(obj, "detachEvent") && !utility.has(obj, "removeEventListener"))) {
                throw new TypeError("Cannot call method 'removeEvent' of " + utility.toClassString(obj));
            }

            if (!utility.isString(obj) || obj.length < 1) {
                throw new TypeError("Attribute 'type' is not a valid identifier");
            }

            if (!utility.isFunction(obj)) {
                throw new TypeError("Attribute 'fn' is not a function");
            }

            if (utility.isFunction(obj, "detachEvent")) {
                obj.detachEvent('on' + type, obj[type + fn]);
                obj[type + fn] = null;
            } else if (utility.isFunction(obj, "removeEventListener")) {
                obj.removeEventListener(type, fn, false);
            } else {
                throw new Error("unable to call method 'removeEvent' of" + utility.toClassString(obj));
            }
        }
    });

    defineProperty(utility, "escapeRegExpString", {
        value: (function () {
            var a = ['.', '*', '+', '?', '^', '=', '!', ':', '$', '{', '}', '(', ')', '|', '[', ']', '/', '\\'],
                rx = new RegExp("([\\" + a.join('\\') + "])", "gm");

            return function (str) {
                if (!utility.isString(str)) {
                    throw new TypeError("Attribute 'str' is not a string " + utility.toClassString(str));
                }

                if (str.length === 0) {
                    return str;
                }

                return str.replace(rx, '\\$1');
            };
        }())
    });

    defineProperty(utility, "repeatString", {
        value: function (str, num) {
            if (!utility.isString(str)) {
                throw new TypeError("Attribute 'str' is not a string " + utility.toClassString(str));
            }

            if (str.length === 0 || !utility.isNumber(num) || !utility.isNumeric(num) || num <= 1) {
                if (num === 1) {
                    return str;
                }

                return '';
            }

            var result = '',
                pattern = str;

            /*jslint bitwise: true */
            while (num > 0) {
                if (num & 1) {
                    result += pattern;
                }

                num >>= 1;
                pattern += pattern;
            }
            /*jslint bitwise: false */

            return result;
        }
    });

    defineProperty(utility, "lpadString", {
        value: function (obj, str, num) {
            if (!utility.isString(obj)) {
                throw new TypeError("Attribute 'obj' is not a string " + utility.toClassString(obj));
            }

            if (!utility.isString(str)) {
                throw new TypeError("Attribute 'str' is not a string " + utility.toClassString(str));
            }

            return utility.repeatString(str, num) + obj;
        }
    });

    defineProperty(utility, "rpadString", {
        value: function (obj, str, num) {
            if (!utility.isString(obj)) {
                throw new TypeError("Attribute 'obj' is not a string " + utility.toClassString(obj));
            }

            if (!utility.isString(str)) {
                throw new TypeError("Attribute 'str' is not a string " + utility.toClassString(str));
            }

            return utility.repeatString(str, num) + obj;
        }
    });

    defineProperty(utility, "decodeURIQueryString", {
        value: (function () {
            var rx = /\+/g;

            return function (str) {
                if (!utility.isString(str)) {
                    throw new TypeError("Attribute 'str' is not a string " + utility.toClassString(str));
                }

                return str.replace(rx, ' ');
            };
        }())
    });

    defineProperty(utility, "toQueryParams", {
        value: (function () {
            var mrx = new RegExp("([^?#]*)(#.*)?$"),
                qrx = new RegExp("(?:^|&)([^&=]*)=?([^&]*)", "g");

            return function (str) {
                if (!utility.isString(str)) {
                    throw new TypeError("Attribute 'str' is not a string " + utility.toClassString(str));
                }

                var hash = {};

                str.trim().match(mrx)[1].replace(qrx, function () {
                    var args = aSlice.call(arguments),
                        key = args[1],
                        value = args[2];

                    if (utility.isString(key) && key.length > 0) {
                        key = utility.decodeURIQueryString(decodeURIComponent(key));

                        if (utility.isString(value) && value.length > 0) {
                            value = utility.decodeURIQueryString(decodeURIComponent(value));
                        } else {
                            value = "";
                        }

                        if (utility.isString(key) && key.length > 0) {
                            if (utility.isInitialised(hash[key])) {
                                if (!utility.isArray(hash[key])) {
                                    hash[key] = [hash[key]];
                                }

                                hash[key].push(value);
                            } else {
                                hash[key] = value;
                            }
                        }
                    }
                });

                return hash;
            };
        }())
    });

    defineProperty(utility, "toUriParts", {
        value: (function () {
            var srx = new RegExp("^(?:([^:\\/?#]+):)?(?:\\/\\/((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\\/?#]*)(?::(\\d*))?))?((((?:[^?#\\/]*\\/)*)([^?#]*))(?:\\?([^#]*))?(?:#(.*))?)"),
                lrx = new RegExp("^(?:(?![^:@]+:[^:@\\/]*@)([^:\\/?#.]+):)?(?:\\/\\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\\/?#]*)(?::(\\d*))?)(((\\/(?:[^?#](?![^?#\\/]*\\.[^?#\\/.]+(?:[?#]|$)))*\\/?)?([^?#\\/]*))(?:\\?([^#]*))?(?:#(.*))?)"),
                keys = ["source", "protocol", "authority", "userInfo", "user", "password", "host", "port", "relative", "path", "directory", "file", "query", "anchor"];

            return function (str, strict) {
                if (!utility.isString(str)) {
                    throw new TypeError("Attribute 'str' is not a string " + utility.toClassString(str));
                }

                var uri = {},
                    vals;

                if (strict === true) {
                    vals = srx.exec(str);
                } else {
                    vals = lrx.exec(str);
                }

                keys.forEach(function (key, index) {
                    var val = vals[index];

                    if (utility.isString(val) && val.length > 0) {
                        uri[key] = decodeURIComponent(val);
                    } else {
                        uri[key] = "";
                    }
                });

                if (uri.query.length > 0) {
                    uri.queryKey = utility.toQueryParams(uri.query);
                } else {
                    uri.queryKey = {};
                }

                if (uri.anchor.length > 0) {
                    uri.anchorKey = utility.toQueryParams(uri.anchor);
                } else {
                    uri.anchorKey = {};
                }

                return uri;
            };
        }())
    });

    defineProperty(utility, "toNumberIfNumeric", {
        value: function (str) {
            if (utility.isNumeric(str)) {
                return parseFloat(str);
            }

            return str;
        }
    });


    defineProperty(utility, "regex", {
        value: function (str, obj, flags) {
            if (!utility.isString(str)) {
                throw new TypeError("Attribute 'str' is not a string " + utility.toClassString(str));
            }

            if (!utility.isString(obj) && !utility.isRegExp(obj)) {
                throw new TypeError("Attribute 'obj' is not a string or regexp " + utility.toClassString(obj));
            }

            if (utility.isInitialised(flags)) {
                if (!utility.isString(flags)) {
                    throw new TypeError("Attribute 'flags' is not a string " + utility.toClassString(obj));
                }

                if (!/^[gi]*$/.test(flags)) {
                    throw new TypeError("Invalid flags supplied '" + flags.match(new RegExp("[^gi]*")) + "'");
                }
            }

            var matches,
                rx,
                uflags = '',
                cflags = '',
                interim = [],
                results = [];

            if (utility.isString(obj) && utility.isString(flags)) {
                if (flags.indexOf("g") >= 0) {
                    uflags += 'g';
                }

                if (flags.indexOf("i") >= 0) {
                    uflags += 'i';
                }
            }

            if (utility.isString(obj)) {
                matches = str.match(new RegExp(utility.escapeRegExpString(obj), uflags));
            } else {
                matches = str.match(obj);
            }
            if (!utility.isArray(matches)) {
                return utility.toNumberIfNumeric(matches);
            }

            if (utility.isRegExp(obj)) {
                if (obj.global) {
                    if (obj.multiline) {
                        cflags += 'm';
                    }

                    if (obj.ignoreCase) {
                        cflags += 'i';
                    }

                    rx = new RegExp(obj.source, cflags);

                    matches.forEach(function (match) {
                        interim.push(utility.regex(match, rx));
                    });
                } else {
                    if (matches.length > 1) {
                        interim = matches.slice(1);
                    } else {
                        return matches.pop();
                    }
                }

                interim.forEach(function (element) {
                    if (utility.isArray(element)) {
                        var a = [];

                        element.forEach(function (sub) {
                            a.push(utility.toNumberIfNumeric(sub));
                        });

                        results.push(a);
                    } else {
                        results.push(utility.toNumberIfNumeric(element));
                    }
                });
            } else {
                matches.forEach(function (match) {
                    results.push(utility.toNumberIfNumeric(match));
                });
            }

            return results;
        }
    });

    defineProperty(utility, "toList", {
        value: (function () {
            var rx = /[,\n]/g;

            return function (str) {
                if (!utility.isString(str)) {
                    return [];
                }

                var a = [],
                    t = str.split(rx);

                t.forEach(function (element) {
                    var trimmed = element.trim();

                    if (trimmed.length > 0) {
                        a.push(utility.toNumberIfNumeric(trimmed));
                    }
                });

                return a;
            };
        }())
    });

    /*jslint bitwise: true */
    defineProperty(utility, "Utf8encode", {
        value: (function () {
            var rx1 = /[\u0080-\u07ff]/g,
                rx2 = /[\u0800-\uffff]/g,
                b64mask = 0x3f,
                msbmask = 0x80;

            return function (obj) {
                var s;

                if (!utility.isString(obj)) {
                    if (!utility.isInitialised(obj)) {
                        return String(obj);
                    }

                    s = obj.toString();
                } else {
                    s = obj;
                }

                return s.replace(rx1, function (c1) {
                    var cc1 = c1.charCodeAt(0);

                    return String.fromCharCode(0xc0 | cc1 >> 6, msbmask | cc1 & b64mask).replace(rx2, function (c2) {
                        var cc2 = c2.charCodeAt(0);

                        return String.fromCharCode(0xe0 | cc2 >> 12, msbmask | cc2 >> 6 & b64mask, msbmask | cc2 & b64mask);
                    });
                });
            };
        }())
    });
    /*jslint bitwise: false */

    /*jslint bitwise: true */
    defineProperty(utility, "Utf8decode", {
        value: (function () {
            var rx1 = /[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g,
                rx2 = /[\u00c0-\u00df][\u0080-\u00bf]/g,
                b16mask = 0x0f,
                b32mask = 0x1f,
                b64mask = 0x3f;

            return function (obj) {
                if (!utility.isString(obj)) {
                    if (!utility.isInitialised(obj)) {
                        return String(obj);
                    }

                    return obj.toString();
                }

                return obj.replace(rx1, function (c1) {
                    return String.fromCharCode(((c1.charCodeAt(0) & b16mask) << 12) | ((c1.charCodeAt(1) & b64mask) << 6) | (c1.charCodeAt(2) & b64mask)).replace(rx2, function (c2) {
                        return String.fromCharCode((c2.charCodeAt(0) & b32mask) << 6 | c2.charCodeAt(1) & b64mask);
                    });
                });
            };
        }())
    });
    /*jslint bitwise: false */

    defineProperty(utility, "b64CharSet", {
        value: (function () {
            var c = [[65, 90], [97, 122], [48, 57], [43, 43], [47, 47]],
                a = [];

            c.forEach(function (range) {
                var i;

                for (i = range[0]; i <= range[1]; i += 1) {
                    a.push(String.fromCharCode(i));
                }
            });

            return a;
        }())
    });

    /*jslint bitwise: true */
    defineProperty(utility, "btoa", {
        value: (function () {
            var pad = [[/(?:)/, ''], [/(\w\w)$/, "=="], [/(\w)$/, "="]],
                b2aCodex = utility.b64CharSet.slice(),
                b64mask = 0x3f;

            utility.b64CharSet.forEach(function (character, index) {
                b2aCodex[index] = character;
            });

            return function (str) {
                var l = str.length,
                    p = pad[l % 3],
                    e = [],
                    i = 0,
                    bits;

                while (i < l) {
                    bits = str.charCodeAt(i) << 16 | str.charCodeAt(i += 1) << 8 | str.charCodeAt(i += 1);
                    e.push(b2aCodex[bits >> 18 & b64mask] + b2aCodex[bits >> 12 & b64mask] + b2aCodex[bits >> 6 & b64mask] + b2aCodex[bits & b64mask]);
                    i += 1;
                }

                return e.join('').replace(p[0], p[1]);
            };
        }())
    });
    /*jslint bitwise: false */

    defineProperty(utility, "utf8_to_b64", {
        value: function (str) {
            return utility.btoa(utility.Utf8encode(str));
        }
    });

    /*jslint bitwise: true */
    defineProperty(utility, "atob", {
        value: (function () {
            var a2bCodex = {},
                b256mask = 0xff,
                equals = 0x40;

            utility.b64CharSet.forEach(function (character, index) {
                a2bCodex[character] = index;
            });

            a2bCodex["="] = equals;

            return function (str) {
                var l = str.length,
                    d = [],
                    i = 0,
                    h3,
                    h4,
                    bits,
                    o1,
                    o2;

                while (i < l) {
                    bits = a2bCodex[str.charAt(i)] << 18 | a2bCodex[str.charAt(i += 1)] << 12;
                    h3 = a2bCodex[str.charAt(i += 1)];
                    h4 = a2bCodex[str.charAt(i += 1)];
                    bits |= h3 << 6 | h4;
                    o1 = bits >>> 16 & b256mask;
                    if (h3 === equals) {
                        d.push(String.fromCharCode(o1));
                    } else {
                        o2 = bits >>> 8 & b256mask;
                        if (h4 === equals) {
                            d.push(String.fromCharCode(o1, o2));
                        } else {
                            d.push(String.fromCharCode(o1, o2, bits & b256mask));
                        }
                    }

                    i += 1;
                }

                return d.join('');
            };
        }())
    });

    defineProperty(utility, "b64_to_utf8", {
        value: function (str) {
            return utility.Utf8decode(utility.atob(str));
        }
    });

    ///////////////////////////
    //       Mixin functions
    ///////////////////////////

    function mixinCommon(obj) {
        var a = ["ref", "toString", "toLocaleString", "valueOf"];

        utility.mixin(obj.prototype, core.Common.prototype, a);
    }

    function mixinRelavant(obj, inheritFrom) {
        var a = ["constructor", "prototype", "hasOwnProperty", "propertyIsEnum", "isPrototypeOf", "valueOf", "toString", "toLocaleString", "callee", "caller", "__defineGetter__", "__lookupGetter__", "__defineSetter__", "__lookupSetter__"];

        getOwnPropertyNames(inheritFrom).forEach(function (key) {
            var src = getOwnPropertyDescriptor(inheritFrom, key);

            if (a.indexOf(key) < 0) {
                if (utility.isFunction(src.value)) {
                    defineProperty(obj, key, {
                        value: function () {
                            return inheritFrom[key].apply(this.refersTo, arguments);
                        }
                    });
                } else if (utility.isUndefined(src.value) || (utility.isUndefined(src.get) && !utility.isUndefined(src.set))) {
                    defineProperty(obj, key, {
                        get: function () {
                            return this.refersTo[key];
                        }
                    });
                } else if (utility.isUndefined(src.get) && utility.isUndefined(src.set)) {
                    defineProperty(obj, key, {
                        get: function () {
                            return this.refersTo[key];
                        },
                        set: function (val) {
                            this.refersTo[key] = val;
                        }
                    });
                } else if (!utility.isUndefined(src.get) && utility.isUndefined(src.set)) {
                    defineProperty(obj, key, {
                        set: function (val) {
                            this.refersTo[key] = val;
                        }
                    });
                } else {
                    throw new Error("Did not find any expected property descripter elements in " + key);
                }
            }
        });
    }

    ///////////////////////////
    //       Common
    ///////////////////////////

    defineProperty(core, "Common", {
        value: function UCommon() {}
    });

    defineProperty(core.Common.prototype, "ref", {
        get: function () {
            return this.refersTo;
        }
    });

    defineProperty(core.Common.prototype, "valueOf", {
        value: function () {
            if (!utility.isInitialised(this.refersTo)) {
                return this.refersTo;
            }

            return this.refersTo.valueOf();
        }
    });

    defineProperty(core.Common.prototype, "toString", {
        value: function () {
            if (!utility.isInitialised(this.refersTo)) {
                return String(this.refersTo);
            }

            return this.refersTo.toString();
        }
    });

    defineProperty(core.Common.prototype, "toLocaleString", {
        value: function () {
            if (!utility.isInitialised(this.refersTo)) {
                return String(this.refersTo);
            }

            return this.refersTo.toLocaleString();
        }
    });

    ///////////////////////////
    //       Object
    ///////////////////////////

    defineProperty(core, "Object", {
        value: function UObject() {}
    });

    mixinCommon(core.Object);
    mixinRelavant(core.Object.prototype, Object.prototype);

    ///////////////////////////
    //       Array
    ///////////////////////////


    defineProperty(core, "Array", {
        value: function UArray() {}
    });

    mixinCommon(core.Array);
    mixinRelavant(core.Array.prototype, Array.prototype);

    ///////////////////////////
    //       function
    ///////////////////////////

    defineProperty(core, "Function", {
        value: function UFunction() {}
    });

    mixinCommon(core.Function);
    mixinRelavant(core.Function.prototype, Function.prototype);

    ///////////////////////////
    //       String
    ///////////////////////////

    defineProperty(core, "String", {
        value: function UString() {}
    });

    mixinCommon(core.String);
    mixinRelavant(core.String.prototype, String.prototype);

    ///////////////////////////
    //       Number
    ///////////////////////////

    defineProperty(core, "Number", {
        value: function UNumber() {}
    });

    mixinCommon(core.Number);
    mixinRelavant(core.Number.prototype, Number.prototype);

    ///////////////////////////
    //       Date
    ///////////////////////////

    defineProperty(core, "Date", {
        value: function UDate() {}
    });

    mixinCommon(core.Date);
    mixinRelavant(core.Date.prototype, Date.prototype);

    ///////////////////////////
    //       RegExp
    ///////////////////////////

    defineProperty(core, "RegExp", {
        value: function URegExp() {}
    });

    mixinCommon(core.RegExp);
    mixinRelavant(core.RegExp.prototype, RegExp.prototype);

    ///////////////////////////
    //       Arguments
    ///////////////////////////

    defineProperty(core, "Arguments", {
        value: function UArguments() {}
    });

    mixinCommon(core.Arguments);
    mixinRelavant(core.Arguments.prototype, arguments);

    ///////////////////////////
    //       Error
    ///////////////////////////

    defineProperty(core, "Error", {
        value: function UError() {}
    });

    mixinCommon(core.Error);
    mixinRelavant(core.Error.prototype, Error.prototype);

    ///////////////////////////
    //       Boolean
    ///////////////////////////

    defineProperty(core, "Boolean", {
        value: function UBoolean() {}
    });

    mixinCommon(core.Boolean);
    mixinRelavant(core.Boolean.prototype, Boolean.prototype);

    ///////////////////////////
    //       Expose
    ///////////////////////////

    window.$u = utility;
}());
</script>

Setup

/**
   *
   *  Base64 encode / decode
   *  http://www.webtoolkit.info/
   *
   **/
  
  Base64 = {
  
    // private property
    _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
  
    // public method for encoding
    encode: function(input) {
      var output = "";
      var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
      var i = 0;
  
      input = Base64._utf8_encode(input);
  
      while (i < input.length) {
  
        chr1 = input.charCodeAt(i++);
        chr2 = input.charCodeAt(i++);
        chr3 = input.charCodeAt(i++);
  
        enc1 = chr1 >> 2;
        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
        enc4 = chr3 & 63;
  
        if (isNaN(chr2)) {
          enc3 = enc4 = 64;
        } else if (isNaN(chr3)) {
          enc4 = 64;
        }
  
        output = output + this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) + this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
  
      }
  
      return output;
    },
  
    // public method for decoding
    decode: function(input) {
      var output = "";
      var chr1, chr2, chr3;
      var enc1, enc2, enc3, enc4;
      var i = 0;
  
      input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
  
      while (i < input.length) {
  
        enc1 = this._keyStr.indexOf(input.charAt(i++));
        enc2 = this._keyStr.indexOf(input.charAt(i++));
        enc3 = this._keyStr.indexOf(input.charAt(i++));
        enc4 = this._keyStr.indexOf(input.charAt(i++));
  
        chr1 = (enc1 << 2) | (enc2 >> 4);
        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
        chr3 = ((enc3 & 3) << 6) | enc4;
  
        output = output + String.fromCharCode(chr1);
  
        if (enc3 != 64) {
          output = output + String.fromCharCode(chr2);
        }
        if (enc4 != 64) {
          output = output + String.fromCharCode(chr3);
        }
  
      }
  
      output = Base64._utf8_decode(output);
  
      return output;
  
    },
  
    // private method for UTF-8 encoding
    _utf8_encode: function(string) {
      string = string.replace(/\r\n/g, "\n");
      var utftext = "";
  
      for (var n = 0; n < string.length; n++) {
  
        var c = string.charCodeAt(n);
  
        if (c < 128) {
          utftext += String.fromCharCode(c);
        } else if ((c > 127) && (c < 2048)) {
          utftext += String.fromCharCode((c >> 6) | 192);
          utftext += String.fromCharCode((c & 63) | 128);
        } else {
          utftext += String.fromCharCode((c >> 12) | 224);
          utftext += String.fromCharCode(((c >> 6) & 63) | 128);
          utftext += String.fromCharCode((c & 63) | 128);
        }
  
      }
  
      return utftext;
    },
  
    // private method for UTF-8 decoding
    _utf8_decode: function(utftext) {
      var string = "";
      var i = 0;
      var c = c1 = c2 = 0;
  
      while (i < utftext.length) {
  
        c = utftext.charCodeAt(i);
  
        if (c < 128) {
          string += String.fromCharCode(c);
          i++;
        } else if ((c > 191) && (c < 224)) {
          c2 = utftext.charCodeAt(i + 1);
          string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
          i += 2;
        } else {
          c2 = utftext.charCodeAt(i + 1);
          c3 = utftext.charCodeAt(i + 2);
          string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
          i += 3;
        }
  
      }
  
      return string;
    }
  
  }
  
  chr = function(code) {
    return String.fromCharCode(code);
  };
  
  //returns utf8 encoded charachter of a unicode value.
  //code must be a number indicating the Unicode value.
  //returned value is a string between 1 and 4 charachters.
  code2utf = function(code) {
    if (code < 128) return chr(code);
    if (code < 2048) return chr(192 + (code >> 6)) + chr(128 + (code & 63));
    if (code < 65536) return chr(224 + (code >> 12)) + chr(128 + ((code >> 6) & 63)) + chr(128 + (code & 63));
    if (code < 2097152) return chr(240 + (code >> 18)) + chr(128 + ((code >> 12) & 63)) + chr(128 + ((code >> 6) & 63)) + chr(128 + (code & 63));
  };
  
  //it is a private function for internal use in utf8Encode function 
  _utf8Encode = function(str) {
    var utf8str = new Array();
    for (var i = 0; i < str.length; i++) {
      utf8str[i] = code2utf(str.charCodeAt(i));
    }
    return utf8str.join('');
  };
  
  //Encodes a unicode string to UTF8 format.
  utf8Encode = function(str) {
    var utf8str = new Array();
    var pos, j = 0;
    var tmpStr = '';
  
    while ((pos = str.search(/[^\x00-\x7F]/)) != -1) {
      tmpStr = str.match(/([^\x00-\x7F]+[\x00-\x7F]{0,10})+/)[0];
      utf8str[j++] = str.substr(0, pos);
      utf8str[j++] = _utf8Encode(tmpStr);
      str = str.substr(pos + tmpStr.length);
    }
  
    utf8str[j++] = str;
    return utf8str.join('');
  };
  
  function encodeBase64(str) {
    var chr1, chr2, chr3, rez = '',
        arr = [],
        i = 0,
        j = 0,
        code = 0;
    var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='.split('');
  
    while (code = str.charCodeAt(j++)) {
      if (code < 128) {
        arr[arr.length] = code;
      } else if (code < 2048) {
        arr[arr.length] = 192 | (code >> 6);
        arr[arr.length] = 128 | (code & 63);
      } else if (code < 65536) {
        arr[arr.length] = 224 | (code >> 12);
        arr[arr.length] = 128 | ((code >> 6) & 63);
        arr[arr.length] = 128 | (code & 63);
      } else {
        arr[arr.length] = 240 | (code >> 18);
        arr[arr.length] = 128 | ((code >> 12) & 63);
        arr[arr.length] = 128 | ((code >> 6) & 63);
        arr[arr.length] = 128 | (code & 63);
      }
    };
  
    while (i < arr.length) {
      chr1 = arr[i++];
      chr2 = arr[i++];
      chr3 = arr[i++];
  
      rez += chars[chr1 >> 2];
      rez += chars[((chr1 & 3) << 4) | (chr2 >> 4)];
      rez += chars[chr2 === undefined ? 64 : ((chr2 & 15) << 2) | (chr3 >> 6)];
      rez += chars[chr3 === undefined ? 64 : chr3 & 63];
    };
    return rez;
  };
  
  // based on Kevin van Zonneveld (http://kevin.vanzonneveld.net), original by Webtoolkit.info (http://www.webtoolkit.info/)
  // improved by: sowberry, Yves Sucaet, kirilloid
  // bugfixed by: Onno Marsman, Onno Marsman, Ulrich, Rafal Kukawski
  // tweaked by: Jack
  
  function utf8_encode(a) {
    var d = 0,
        b = 0,
        c = "",
        f, e;
    if (null === a || "undefined" === typeof a) {
      return ""
    }
    a += "";
    f = a.length;
    for (var g = 0; g < f; g++) {
      e = a.charCodeAt(g), crt_encode = null, 128 > e ? d++ : crt_encode = 127 < e && 2048 > e ? String.fromCharCode(e >> 6 | 192, e & 63 | 128) : String.fromCharCode(e >> 12 | 224, e >> 6 & 63 | 128, e & 63 | 128), null !== crt_encode && (d > b && (c += a.slice(b, d)), c += crt_encode, b = d = g + 1)
    }
    d > b && (c += a.slice(b, f));
    return c
  }
  // based on http://www.webtoolkit.info/
  
  function base64_encode(a) {
    var d = "",
        b, c, f, e, g, h, j = 0,
        k;
    a = utf8_encode(a);
    for (k = a.length; j < k;) {
      b = a.charCodeAt(j++), c = a.charCodeAt(j++), f = a.charCodeAt(j++), e = b >> 2, b = (b & 3) << 4 | c >> 4, g = (c & 15) << 2 | f >> 6, h = f & 63, isNaN(c) ? g = h = 64 : isNaN(f) && (h = 64), d += "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".charAt(e) + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".charAt(b) + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".charAt(g) + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".charAt(h)
    }
    return d
  }
  
  a = "";
  for (var i = 0; i < 100; i++)
  a += "teststring ";

Test runner

Ready to run.

Testing in
TestOps/sec
native btoa with javascript utf-8 #2
b = btoa(utf8Encode(a));
ready
Native btoa function
b = btoa(a);
ready
javascript btoa
b = Base64.encode(a);
ready
native btoa with javscript utf-8 encode
b = btoa(Base64._utf8_encode(a));
ready
native btoa with native utf-8 encoding
b = btoa(unescape(encodeURIComponent(a)));
ready
Javascript btoa #2 (encodeBase64)
b = encodeBase64(a);
ready
native btoa with javascript utf8_encode
b = btoa(utf8_encode(a));
ready
base64_encode with javascript utf8_encode
b = base64_encode(utf8_encode(a));
ready
$u.btoa
b = $u.btoa(a);
ready
$u.btoa with $u.Utf8encode
b = $u.btoa($u.Utf8encode(a));
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.