mirror of
https://github.com/Ylianst/MeshCentral.git
synced 2024-12-26 15:15:53 -05:00
105 lines
4.1 KiB
JavaScript
105 lines
4.1 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
// From: http://hg.mozilla.org/mozilla-central/raw-file/ec10630b1a54/js/src/devtools/jint/sunspider/string-base64.js
|
|
|
|
import * as Log from './util/logging.js';
|
|
|
|
export default {
|
|
/* Convert data (an array of integers) to a Base64 string. */
|
|
toBase64Table: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='.split(''),
|
|
base64Pad: '=',
|
|
|
|
encode(data) {
|
|
"use strict";
|
|
let result = '';
|
|
const length = data.length;
|
|
const lengthpad = (length % 3);
|
|
// Convert every three bytes to 4 ascii characters.
|
|
|
|
for (let i = 0; i < (length - 2); i += 3) {
|
|
result += this.toBase64Table[data[i] >> 2];
|
|
result += this.toBase64Table[((data[i] & 0x03) << 4) + (data[i + 1] >> 4)];
|
|
result += this.toBase64Table[((data[i + 1] & 0x0f) << 2) + (data[i + 2] >> 6)];
|
|
result += this.toBase64Table[data[i + 2] & 0x3f];
|
|
}
|
|
|
|
// Convert the remaining 1 or 2 bytes, pad out to 4 characters.
|
|
const j = length - lengthpad;
|
|
if (lengthpad === 2) {
|
|
result += this.toBase64Table[data[j] >> 2];
|
|
result += this.toBase64Table[((data[j] & 0x03) << 4) + (data[j + 1] >> 4)];
|
|
result += this.toBase64Table[(data[j + 1] & 0x0f) << 2];
|
|
result += this.toBase64Table[64];
|
|
} else if (lengthpad === 1) {
|
|
result += this.toBase64Table[data[j] >> 2];
|
|
result += this.toBase64Table[(data[j] & 0x03) << 4];
|
|
result += this.toBase64Table[64];
|
|
result += this.toBase64Table[64];
|
|
}
|
|
|
|
return result;
|
|
},
|
|
|
|
/* Convert Base64 data to a string */
|
|
/* eslint-disable comma-spacing */
|
|
toBinaryTable: [
|
|
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
|
|
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
|
|
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
|
|
52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1,
|
|
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
|
|
15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
|
|
-1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
|
|
41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
|
|
],
|
|
/* eslint-enable comma-spacing */
|
|
|
|
decode(data, offset = 0) {
|
|
let data_length = data.indexOf('=') - offset;
|
|
if (data_length < 0) { data_length = data.length - offset; }
|
|
|
|
/* Every four characters is 3 resulting numbers */
|
|
const result_length = (data_length >> 2) * 3 + Math.floor((data_length % 4) / 1.5);
|
|
const result = new Array(result_length);
|
|
|
|
// Convert one by one.
|
|
|
|
let leftbits = 0; // number of bits decoded, but yet to be appended
|
|
let leftdata = 0; // bits decoded, but yet to be appended
|
|
for (let idx = 0, i = offset; i < data.length; i++) {
|
|
const c = this.toBinaryTable[data.charCodeAt(i) & 0x7f];
|
|
const padding = (data.charAt(i) === this.base64Pad);
|
|
// Skip illegal characters and whitespace
|
|
if (c === -1) {
|
|
Log.Error("Illegal character code " + data.charCodeAt(i) + " at position " + i);
|
|
continue;
|
|
}
|
|
|
|
// Collect data into leftdata, update bitcount
|
|
leftdata = (leftdata << 6) | c;
|
|
leftbits += 6;
|
|
|
|
// If we have 8 or more bits, append 8 bits to the result
|
|
if (leftbits >= 8) {
|
|
leftbits -= 8;
|
|
// Append if not padding.
|
|
if (!padding) {
|
|
result[idx++] = (leftdata >> leftbits) & 0xff;
|
|
}
|
|
leftdata &= (1 << leftbits) - 1;
|
|
}
|
|
}
|
|
|
|
// If there are any bits left, the base64 string was corrupted
|
|
if (leftbits) {
|
|
const err = new Error('Corrupted base64 string');
|
|
err.name = 'Base64-Error';
|
|
throw err;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
}; /* End of Base64 namespace */
|