44 lines
2.1 KiB
JavaScript
44 lines
2.1 KiB
JavaScript
|
function base64_encode(r) {
|
||
|
|
for (var e, a, t, o = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/", c = 0, h = r.length, d = ""; c < h; ) {
|
||
|
|
if (e = 255 & r.charCodeAt(c++), c == h) {
|
||
|
|
d += o.charAt(e >> 2), d += o.charAt((3 & e) << 4), d += "==";
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (a = r.charCodeAt(c++), c == h) {
|
||
|
|
d += o.charAt(e >> 2), d += o.charAt((3 & e) << 4 | (240 & a) >> 4), d += o.charAt((15 & a) << 2),
|
||
|
|
d += "=";
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
t = r.charCodeAt(c++), d += o.charAt(e >> 2), d += o.charAt((3 & e) << 4 | (240 & a) >> 4),
|
||
|
|
d += o.charAt((15 & a) << 2 | (192 & t) >> 6), d += o.charAt(63 & t);
|
||
|
|
}
|
||
|
|
return d;
|
||
|
|
}
|
||
|
|
|
||
|
|
function base64_decode(r) {
|
||
|
|
for (var e, a, t, o, c = 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), h = 0, d = r.length, f = ""; h < d; ) {
|
||
|
|
for (;e = c[255 & r.charCodeAt(h++)], h < d && -1 == e; ) ;
|
||
|
|
if (-1 == e) break;
|
||
|
|
for (;a = c[255 & r.charCodeAt(h++)], h < d && -1 == a; ) ;
|
||
|
|
if (-1 == a) break;
|
||
|
|
f += String.fromCharCode(e << 2 | (48 & a) >> 4);
|
||
|
|
do {
|
||
|
|
if (61 == (t = 255 & r.charCodeAt(h++))) return f;
|
||
|
|
t = c[t];
|
||
|
|
} while (h < d && -1 == t);
|
||
|
|
if (-1 == t) break;
|
||
|
|
f += String.fromCharCode((15 & a) << 4 | (60 & t) >> 2);
|
||
|
|
do {
|
||
|
|
if (61 == (o = 255 & r.charCodeAt(h++))) return f;
|
||
|
|
o = c[o];
|
||
|
|
} while (h < d && -1 == o);
|
||
|
|
if (-1 == o) break;
|
||
|
|
f += String.fromCharCode((3 & t) << 6 | o);
|
||
|
|
}
|
||
|
|
return f;
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
base64_encode: base64_encode,
|
||
|
|
base64_decode: base64_decode
|
||
|
|
};
|