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- export function weBtoa(string){
- var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
- b64re = /^(?:[A-Za-z\d+\/]{4})*?(?:[A-Za-z\d+\/]{2}(?:==)?|[A-Za-z\d+\/]{3}=?)?$/;
- string = String(string);
- var bitmap, a, b, c,
- result = "",
- i = 0,
- rest = string.length % 3; // To determine the final padding
-
- for (; i < string.length;) {
- if ((a = string.charCodeAt(i++)) > 255 ||
- (b = string.charCodeAt(i++)) > 255 ||
- (c = string.charCodeAt(i++)) > 255)
- throw new TypeError("Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range.");
-
- bitmap = (a << 16) | (b << 8) | c;
- result += b64.charAt(bitmap >> 18 & 63) + b64.charAt(bitmap >> 12 & 63) +
- b64.charAt(bitmap >> 6 & 63) + b64.charAt(bitmap & 63);
- }
-
- // If there's need of padding, replace the last 'A's with equal signs
- return rest ? result.slice(0, rest - 3) + "===".substring(rest) : result;
- }
-
- export function weAtob(string){
- // atob can work with strings with whitespaces, even inside the encoded part,
- // but only \t, \n, \f, \r and ' ', which can be stripped.
- var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
- b64re = /^(?:[A-Za-z\d+\/]{4})*?(?:[A-Za-z\d+\/]{2}(?:==)?|[A-Za-z\d+\/]{3}=?)?$/;
- string = String(string).replace(/[\t\n\f\r ]+/g, "");
- if (!b64re.test(string))
- throw new TypeError("Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded.");
-
- // Adding the padding if missing, for semplicity
- string += "==".slice(2 - (string.length & 3));
- var bitmap, result = "",
- r1, r2, i = 0;
- for (; i < string.length;) {
- bitmap = b64.indexOf(string.charAt(i++)) << 18 | b64.indexOf(string.charAt(i++)) << 12 |
- (r1 = b64.indexOf(string.charAt(i++))) << 6 | (r2 = b64.indexOf(string.charAt(i++)));
-
- result += r1 === 64 ? String.fromCharCode(bitmap >> 16 & 255) :
- r2 === 64 ? String.fromCharCode(bitmap >> 16 & 255, bitmap >> 8 & 255) :
- String.fromCharCode(bitmap >> 16 & 255, bitmap >> 8 & 255, bitmap & 255);
- }
- return result;
- }
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