https://jf-beira.pt/modules/mod_bt_googlemaps/tmpl/js/btbase64.min.js

1var BT = BT || {};
2(function() {
3	BT.Base64 = 
4			{
5				keyString : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
6				UTF8Encode : function(b) {
7					b = b.replace(/\x0d\x0a/g, "\x0a");
8					var a = "";
9					for ( var e = 0; e < b.length; e++) {
10						var d = b.charCodeAt(e);
11						if (d < 128) {
12							a += String.fromCharCode(d)
13						} else {
14							if ((d > 127) && (d < 2048)) {
15								a += String.fromCharCode((d >> 6) | 192);
16								a += String.fromCharCode((d & 63) | 128)
17							} else {
18								a += String.fromCharCode((d >> 12) | 224);
19								a += String.fromCharCode(((d >> 6) & 63) | 128);
20								a += String.fromCharCode((d & 63) | 128)
21							}
22						}
23					}
24					return a
25				},
26				UTF8Decode : function(a) {
27					var b = "";
28					var d = 0;
29					var e = c1 = c2 = 0;
30					while (d < a.length) {
31						e = a.charCodeAt(d);
32						if (e < 128) {
33							b += String.fromCharCode(e);
34							d++
35						} else {
36							if ((e > 191) && (e < 224)) {
37								c2 = a.charCodeAt(d + 1);
38								b += String.fromCharCode(((e & 31) << 6)
39										| (c2 & 63));
40								d += 2
41							} else {
42								c2 = a.charCodeAt(d + 1);
43								c3 = a.charCodeAt(d + 2);
44								b += String.fromCharCode(((e & 15) << 12)
45										| ((c2 & 63) << 6) | (c3 & 63));
46								d += 3
47							}
48						}
49					}
50					return b
51				},
52				base64Encode : function(c) {
53					var a = "";
54					var k, h, f, j, g, e, d;
55					var b = 0;
56					c = this.UTF8Encode(c);
57					while (b < c.length) {
58						k = c.charCodeAt(b++);
59						h = c.charCodeAt(b++);
60						f = c.charCodeAt(b++);
61						j = k >> 2;
62						g = ((k & 3) << 4) | (h >> 4);
63						e = ((h & 15) << 2) | (f >> 6);
64						d = f & 63;
65						if (isNaN(h)) {
66							e = d = 64
67						} else {
68							if (isNaN(f)) {
69								d = 64
70							}
71						}
72						a = a + this.keyString.charAt(j)
73								+ this.keyString.charAt(g)
74								+ this.keyString.charAt(e)
75								+ this.keyString.charAt(d)
76					}
77					return a
78				},
79				base64Decode : function(c) {
80					var a = "";
81					var k, h, f;
82					var j, g, e, d;
83					var b = 0;
84					c = c.replace(/[^A-Za-z0-9\+\/\=]/g, "");
85					while (b < c.length) {
86						j = this.keyString.indexOf(c.charAt(b++));
87						g = this.keyString.indexOf(c.charAt(b++));
88						e = this.keyString.indexOf(c.charAt(b++));
89						d = this.keyString.indexOf(c.charAt(b++));
90						k = (j << 2) | (g >> 4);
91						h = ((g & 15) << 4) | (e >> 2);
92						f = ((e & 3) << 6) | d;
93						a = a + String.fromCharCode(k);
94						if (e != 64) {
95							a = a + String.fromCharCode(h)
96						}
97						if (d != 64) {
98							a = a + String.fromCharCode(f)
99						}
100					}
101					a = this.UTF8Decode(a);
102					return a
103				}
104			}
105})();