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var base64encodechars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
base64decodechars = 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),
base64encode = function(str) {
var out, i, len, c1, c2, c3;
len = str.length,
i = 0,
out = "";
while (i < len) {
c1 = str.charCodeAt(i++) & 255;
if (i == len) {
out += base64encodechars.charAt(c1 >> 2),
out += base64encodechars.charAt((c1 & 3) << 4),
out += "==";
break;
}
c2 = str.charCodeAt(i++);
if (i == len) {
out += base64encodechars.charAt(c1 >> 2),
out += base64encodechars.charAt((c1 & 3) << 4 | (c2 & 240) >> 4),
out += base64encodechars.charAt((c2 & 15) << 2),
out += "=";
break;
}
c3 = str.charCodeAt(i++),
out += base64encodechars.charAt(c1 >> 2),
out += base64encodechars.charAt((c1 & 3) << 4 | (c2 & 240) >> 4),
out += base64encodechars.charAt((c2 & 15) << 2 | (c3 & 192) >> 6),
out += base64encodechars.charAt(c3 & 63);
}
return out;
},
base64decode = function(e) {
var t, n, r, i, s, o, u;
o = e.length,
s = 0,
u = "";
while (s < o) {
do t = base64decodechars[e.charCodeAt(s++) & 255];
while (s < o && t == -1);
if (t == -1) break;
do n = base64decodechars[e.charCodeAt(s++) & 255];
while (s < o && n == -1);
if (n == -1) break;
u += String.fromCharCode(t << 2 | (n & 48) >> 4);
do {
r = e.charCodeAt(s++) & 255;
if (r == 61) return u;
r = base64decodechars[r];
} while ( s < o && r == - 1 );
if (r == -1) break;
u += String.fromCharCode((n & 15) << 4 | (r & 60) >> 2);
do {
i = e.charCodeAt(s++) & 255;
if (i == 61) return u;
i = base64decodechars[i];
} while ( s < o && i == - 1 );
if (i == -1) break;
u += String.fromCharCode((r & 3) << 6 | i);
}
return u;
},
utf16to8 = function(e) {
var t, n, r, i;
t = "",
r = e.length;
for (n = 0; n < r; n++) i = e.charCodeAt(n),
i >= 1 && i <= 127 ? t += e.charAt(n) : i > 2047 ? (t += String.fromCharCode(224 | i >> 12 & 15), t += String.fromCharCode(128 | i >> 6 & 63), t += String.fromCharCode(128 | i >> 0 & 63)) : (t += String.fromCharCode(192 | i >> 6 & 31), t += String.fromCharCode(128 | i >> 0 & 63));
return t;
},
utf8to16 = function(e) {
var t, n, r, i, s, o;
t = "",
r = e.length,
n = 0;
while (n < r) {
i = e.charCodeAt(n++);
switch (i >> 4) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
t += e.charAt(n - 1);
break;
case 12:
case 13:
s = e.charCodeAt(n++),
t += String.fromCharCode((i & 31) << 6 | s & 63);
break;
case 14:
s = e.charCodeAt(n++),
o = e.charCodeAt(n++),
t += String.fromCharCode((i & 15) << 12 | (s & 63) << 6 | (o & 63) << 0);
}
}
return t;
};
module.exports = {
"encode": function(data) {
return base64encode(utf16to8(data));
},
"decode": function(data) {
return utf8to16(base64decode(data));
}
};