(function () {

    var encTable = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    var decTable = 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);

    Rakka.encodeBase64 = function (src) {
        var len = src.length;
        var i   = 0;
        var ret = "";

        while (i < len) {
            var c1 = src.charCodeAt(i++);
            
            if (i == len) {
                ret += encTable.charAt(c1 >> 2);
                ret += encTable.charAt((c1 & 0x03) << 4);
                ret += "==";
            }
            else {
                var c2 = src.charCodeAt(i++);

                if (i == len) {
                    ret += encTable.charAt(c1 >> 2);
                    ret += encTable.charAt(((c1 & 0x03) << 4) | ((c2 & 0xF0) >> 4));
                    ret += encTable.charAt((c2 & 0x0F) << 2);
                    ret += "=";
                }
                else {
                    var c3 = src.charCodeAt(i++);

                    ret += encTable.charAt(c1 >> 2);
                    ret += encTable.charAt(((c1 & 0x03) << 4) | ((c2 & 0xF0) >> 4));
                    ret += encTable.charAt(((c2 & 0x0F) << 2) | ((c3 & 0xC0) >> 6));
                    ret += encTable.charAt(c3 & 0x3F);
                }
            }
        }

        return ret;
    };

    Rakka.decodeBase64 = function (src) {
        var len = src.length;
        var i   = 0;
        var ret = "";

        while (i < len) {
            var c1;
            do {
                c1 = decTable[src.charCodeAt(i++)];
            } while (i < len && c1 == -1);
            
            if (c1 != -1) {
                var c2;
                do {
                    c2 = decTable[src.charCodeAt(i++)];
                } while (i < len && c2 == -1);
                
                if (c2 != -1) {

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

                    var c3;
                    do {
                        c3 = src.charCodeAt(i++);
                        if (c3 == 61) {
                            return ret;
                        }
                        c3 = decTable[c3];
                    } while (i < len && c3 == -1);

                    if (c3 != -1) {
                        ret += String.fromCharCode(((c2 & 0x0F) << 4) | ((c3 & 0x3C) >> 2));

                        var c4;
                        do {
                            c4 = src.charCodeAt(i++);
                            if (c4 == 61) {
                                return ret;
                            }
                            c4 = decTable[c4];
                        } while (i < len && c4 == -1);

                        if (c4 != -1) {
                            ret += String.fromCharCode(((c3 & 0x03) << 6) | c4);
                        }
                    }
                }
            }
        }

        return ret;
    };

})();