@wesjet/function.js
Version:
wesjet javascript library
125 lines (124 loc) • 2.48 kB
JavaScript
/**
* Copyright (c) Wesbitty, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
*
*/
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
// https://deno.land/std/encoding/base64.ts
const base64abc = [
'A',
'B',
'C',
'D',
'E',
'F',
'G',
'H',
'I',
'J',
'K',
'L',
'M',
'N',
'O',
'P',
'Q',
'R',
'S',
'T',
'U',
'V',
'W',
'X',
'Y',
'Z',
'a',
'b',
'c',
'd',
'e',
'f',
'g',
'h',
'i',
'j',
'k',
'l',
'm',
'n',
'o',
'p',
'q',
'r',
's',
't',
'u',
'v',
'w',
'x',
'y',
'z',
'0',
'1',
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
'+',
'/',
];
/**
* CREDIT: https://gist.github.com/enepomnyaschih/72c423f727d395eeaa09697058238727
* Encodes a given Uint8Array, ArrayBuffer or string into RFC4648 base64 representation
* @param data
*/
export const encode = (data) => {
const uint8 = typeof data === 'string'
? new TextEncoder().encode(data)
: data instanceof Uint8Array
? data
: new Uint8Array(data);
let result = '', i;
const l = uint8.length;
for (i = 2; i < l; i += 3) {
result += base64abc[uint8[i - 2] >> 2];
result += base64abc[((uint8[i - 2] & 0x03) << 4) | (uint8[i - 1] >> 4)];
result += base64abc[((uint8[i - 1] & 0x0f) << 2) | (uint8[i] >> 6)];
result += base64abc[uint8[i] & 0x3f];
}
if (i === l + 1) {
// 1 octet yet to write
result += base64abc[uint8[i - 2] >> 2];
result += base64abc[(uint8[i - 2] & 0x03) << 4];
result += '==';
}
if (i === l) {
// 2 octets yet to write
result += base64abc[uint8[i - 2] >> 2];
result += base64abc[((uint8[i - 2] & 0x03) << 4) | (uint8[i - 1] >> 4)];
result += base64abc[(uint8[i - 1] & 0x0f) << 2];
result += '=';
}
return result;
};
/**
* Decodes a given RFC4648 base64 encoded string
* @param b64
*/
export const decode = (b64) => {
const binString = atob(b64);
const size = binString.length;
const bytes = new Uint8Array(size);
for (let i = 0; i < size; i++) {
bytes[i] = binString.charCodeAt(i);
}
return bytes;
};