Ext.util.base64 = {

    base64s: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",

    encode: function(decStr) {
        if (typeof btoa === 'function') {
            return btoa(decStr);
        }
        var base64s = this.base64s;
        var bits;
        var dual;
        var i = 0;
        var encOut = "";
        while (decStr.length >= i + 3) {
            bits = (decStr.charCodeAt(i++) & 0xff) << 16 | (decStr.charCodeAt(i++) & 0xff) << 8 | decStr.charCodeAt(i++) & 0xff;
            encOut += base64s.charAt((bits & 0x00fc0000) >> 18) + base64s.charAt((bits & 0x0003f000) >> 12) + base64s.charAt((bits & 0x00000fc0) >> 6) + base64s.charAt((bits & 0x0000003f));
        }
        if (decStr.length - i > 0 && decStr.length - i < 3) {
            dual = Boolean(decStr.length - i - 1);
            bits = ((decStr.charCodeAt(i++) & 0xff) << 16) | (dual ? (decStr.charCodeAt(i) & 0xff) << 8 : 0);
            encOut += base64s.charAt((bits & 0x00fc0000) >> 18) + base64s.charAt((bits & 0x0003f000) >> 12) + (dual ? base64s.charAt((bits & 0x00000fc0) >> 6) : '=') + '=';
        }
        return (encOut);
    },

    decode: function(encStr) {
        if (typeof atob === 'function') {
            return atob(encStr);
        }
        var base64s = this.base64s;
        var bits;
        var decOut = "";
        var i = 0;
        for (; i < encStr.length; i += 4) {
            bits = (base64s.indexOf(encStr.charAt(i)) & 0xff) << 18 | (base64s.indexOf(encStr.charAt(i + 1)) & 0xff) << 12 | (base64s.indexOf(encStr.charAt(i + 2)) & 0xff) << 6 | base64s.indexOf(encStr.charAt(i + 3)) & 0xff;
            decOut += String.fromCharCode((bits & 0xff0000) >> 16, (bits & 0xff00) >> 8, bits & 0xff);
        }
        if (encStr.charCodeAt(i - 2) == 61) {
            return (decOut.substring(0, decOut.length - 2));
        }
        else if (encStr.charCodeAt(i - 1) == 61) {
            return (decOut.substring(0, decOut.length - 1));
        }
        else {
            return (decOut);
        }
    }

};