sheetjs-clone/bits/04_base64.js
SheetJS a8736580a5 version bump 0.10.0: cleanup
- updated SSF to 0.9.2
- XLSB style records and number format writing
- CSV avoid parseFloat (fixes #646 h/t @jabbermarky)
- CSV recognize mac line ending (fixes #648 h/t @charlesread)
- BIFF2 format table refactored to align with SSF
- BIFF5 image data exposure
- SSF custom format auto table update (fixes #267 h/t @Fangmingdu)
- eslint more checks
- browser test timeout extended to 10 seconds
2017-05-09 14:07:57 -04:00

42 lines
1.2 KiB
JavaScript

var Base64 = (function make_b64(){
var map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
return {
encode: function(input/*:string*/)/*:string*/ {
var o = "";
var c1, c2, c3, e1, e2, e3, e4;
for(var i = 0; i < input.length; ) {
c1 = input.charCodeAt(i++);
c2 = input.charCodeAt(i++);
c3 = input.charCodeAt(i++);
e1 = c1 >> 2;
e2 = (c1 & 3) << 4 | c2 >> 4;
e3 = (c2 & 15) << 2 | c3 >> 6;
e4 = c3 & 63;
if (isNaN(c2)) { e3 = e4 = 64; }
else if (isNaN(c3)) { e4 = 64; }
o += map.charAt(e1) + map.charAt(e2) + map.charAt(e3) + map.charAt(e4);
}
return o;
},
decode: function b64_decode(input/*:string*/)/*:string*/ {
var o = "";
var c1, c2, c3;
var e1, e2, e3, e4;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
for(var i = 0; i < input.length;) {
e1 = map.indexOf(input.charAt(i++));
e2 = map.indexOf(input.charAt(i++));
e3 = map.indexOf(input.charAt(i++));
e4 = map.indexOf(input.charAt(i++));
c1 = e1 << 2 | e2 >> 4;
c2 = (e2 & 15) << 4 | e3 >> 2;
c3 = (e3 & 3) << 6 | e4;
o += String.fromCharCode(c1);
if (e3 != 64) { o += String.fromCharCode(c2); }
if (e4 != 64) { o += String.fromCharCode(c3); }
}
return o;
}
};
})();