chedder
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text/typescript
//
// LMT migrated to ES2020/ts module format
//
// Written in 2014-2016 by Dmitry Chestnykh and Devi Mandiri.
// Public domain.
//--bto & atob base64 browser & node
const nodeBtoa = (str:string) => Buffer.from(str).toString('base64');
export const universal_btoa = nodeBtoa
const nodeAtob = (u64encoded: string) => Buffer.from(u64encoded, 'base64').toString();
export const universal_atob = nodeAtob;
//--
export function encodeUTF8(arr: Uint8Array): string {
var i, s = [];
for (i = 0; i < arr.length; i++) s.push(String.fromCharCode(arr[i]));
return decodeURIComponent(escape(s.join('')));
};
export function decodeUTF8(s: string): Uint8Array {
if (typeof s !== 'string') throw new TypeError('expected string');
var i, d = unescape(encodeURIComponent(s)), b = new Uint8Array(d.length);
for (i = 0; i < d.length; i++) b[i] = d.charCodeAt(i);
return b;
};
export function validateBase64(s:string) {
if (!(/^(?:[A-Za-z0-9+\/]{2}[A-Za-z0-9+\/]{2})*(?:[A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)?$/.test(s))) {
throw new TypeError('invalid encoding');
}
}
export function encodeBase64(arr: Uint8Array): string {
var i, s = [], len = arr.length;
for (i = 0; i < len; i++) s.push(String.fromCharCode(arr[i]));
return universal_btoa(s.join(''));
};
export function decodeBase64(s: string): Uint8Array {
validateBase64(s);
var i, d = universal_atob(s), b = new Uint8Array(d.length);
for (i = 0; i < d.length; i++) b[i] = d.charCodeAt(i);
return b;
};
/*
util.encodeUTF8 = function(arr) {
var i, s = [];
for (i = 0; i < arr.length; i++) s.push(String.fromCharCode(arr[i]));
return decodeURIComponent(escape(s.join('')));
};
if (typeof atob === 'undefined') {
// Node.js
if (typeof Buffer.from !== 'undefined') {
// Node v6 and later
util.encodeBase64 = function (arr) { // v6 and later
return Buffer.from(arr).toString('base64');
};
util.decodeBase64 = function (s) {
validateBase64(s);
return new Uint8Array(Array.prototype.slice.call(Buffer.from(s, 'base64'), 0));
};
} else {
// Node earlier than v6
util.encodeBase64 = function (arr) { // v6 and later
return (new Buffer(arr)).toString('base64');
};
util.decodeBase64 = function(s) {
validateBase64(s);
return new Uint8Array(Array.prototype.slice.call(new Buffer(s, 'base64'), 0));
};
}
} else {
// Browsers
util.encodeBase64 = function(arr) {
var i, s = [], len = arr.length;
for (i = 0; i < len; i++) s.push(String.fromCharCode(arr[i]));
return btoa(s.join(''));
};
util.decodeBase64 = function(s) {
validateBase64(s);
var i, d = atob(s), b = new Uint8Array(d.length);
for (i = 0; i < d.length; i++) b[i] = d.charCodeAt(i);
return b;
};
}
return util;
}));
*/