Ext.ux.Base64

Ext.ux.Base64.js

//jshint camelcase:false
Ext.define('Ext.ux.Base64', {
    singleton : true,

    _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
    encode : function(e) {
        var t = "";
        var n,
            r,
            i,
            s,
            o,
            u,
            a;
        var f = 0;
        e = Ext.ux.Base64._utf8_encode(e);
        while (f < e.length) {
            n = e.charCodeAt(f++);
            r = e.charCodeAt(f++);
            i = e.charCodeAt(f++);
            s = n >> 2;
            o = (n & 3) << 4 | r >> 4;
            u = (r & 15) << 2 | i >> 6;
            a = i & 63;
            if (isNaN(r)) {
                u = a = 64;
            } else if (isNaN(i)) {
                a = 64;
            }
            t = t + this._keyStr.charAt(s) + this._keyStr.charAt(o) + this._keyStr.charAt(u) + this._keyStr.charAt(a);
        }
        return t;
    },
    decode : function(e) {
        var t = "";
        var n,
            r,
            i;
        var s,
            o,
            u,
            a;
        var f = 0;
        e = e.replace(/[^A-Za-z0-9\+\/\=]/g, "");
        while (f < e.length) {
            s = this._keyStr.indexOf(e.charAt(f++));
            o = this._keyStr.indexOf(e.charAt(f++));
            u = this._keyStr.indexOf(e.charAt(f++));
            a = this._keyStr.indexOf(e.charAt(f++));
            n = s << 2 | o >> 4;
            r = (o & 15) << 4 | u >> 2;
            i = (u & 3) << 6 | a;
            t = t + String.fromCharCode(n);
            if (u !== 64) {
                t = t + String.fromCharCode(r);
            }
            if (a !== 64) {
                t = t + String.fromCharCode(i);
            }
        }
        t = Ext.ux.Base64._utf8_decode(t);
        return t;
    },
    _utf8_encode : function(e) {
        e = e.replace(/\r\n/g, "\n");
        var t = "";
        for (var n = 0; n < e.length; n++) {
            var r = e.charCodeAt(n);
            if (r < 128) {
                t += String.fromCharCode(r);
            } else if (r > 127 && r < 2048) {
                t += String.fromCharCode(r >> 6 | 192);
                t += String.fromCharCode(r & 63 | 128);
            } else {
                t += String.fromCharCode(r >> 12 | 224);
                t += String.fromCharCode(r >> 6 & 63 | 128);
                t += String.fromCharCode(r & 63 | 128);
            }
        }
        return t;
    },
    _utf8_decode : function(e) {
        var t = "";
        var n = 0;
        var r = 0;
        var c2 = 0;
        while (n < e.length) {
            r = e.charCodeAt(n);
            if (r < 128) {
                t += String.fromCharCode(r);
                n++;
            } else if (r > 191 && r < 224) {
                c2 = e.charCodeAt(n + 1);
                t += String.fromCharCode((r & 31) << 6 | c2 & 63);
                n += 2;
            } else {
                c2 = e.charCodeAt(n + 1);
                c3 = e.charCodeAt(n + 2);
                t += String.fromCharCode((r & 15) << 12 | (c2 & 63) << 6 | c3 & 63);
                n += 3;
            }
        }
        return t;
    }
});

Usage:

var encoded = Ext.ux.Base64.encode("my string");