66 lines
1.5 KiB
JavaScript
66 lines
1.5 KiB
JavaScript
angular.module("webui.services.base64", []).factory("$base64", [
|
|
function() {
|
|
var obj = {};
|
|
var a64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
|
|
a256 = {
|
|
indexOf: function(c) {
|
|
return c.charCodeAt(0);
|
|
},
|
|
charAt: String.fromCharCode
|
|
};
|
|
|
|
function code(s, discard, alpha, beta, w1, w2) {
|
|
s = String(s);
|
|
var b = 0,
|
|
x = "",
|
|
i,
|
|
c,
|
|
bs = 1,
|
|
sb = 1,
|
|
length = s.length,
|
|
tmp;
|
|
for (i = 0; i < length || (!discard && sb > 1); i += 1) {
|
|
b *= w1;
|
|
bs *= w1;
|
|
if (i < length) {
|
|
c = alpha.indexOf(s.charAt(i));
|
|
if (c <= -1 || c >= w1) {
|
|
throw new RangeError();
|
|
}
|
|
sb *= w1;
|
|
b += c;
|
|
}
|
|
while (bs >= w2) {
|
|
bs /= w2;
|
|
if (sb > 1) {
|
|
tmp = b;
|
|
b %= bs;
|
|
x += beta.charAt((tmp - b) / bs);
|
|
sb /= w2;
|
|
}
|
|
}
|
|
}
|
|
return x;
|
|
}
|
|
|
|
obj.btoa = function(s) {
|
|
s = code(s, false, a256, a64, 256, 64);
|
|
return s + "====".slice(s.length % 4 || 4);
|
|
};
|
|
|
|
obj.atob = function(s) {
|
|
var i;
|
|
s = String(s).split("=");
|
|
for (i = s.length - 1; i >= 0; i -= 1) {
|
|
if (s[i].length % 4 === 1) {
|
|
throw new RangeError();
|
|
}
|
|
s[i] = code(s[i], true, a64, a256, 64, 256);
|
|
}
|
|
return s.join("");
|
|
};
|
|
|
|
return obj;
|
|
}
|
|
]);
|