mirror of
https://github.com/mozilla/gecko-dev.git
synced 2025-11-04 18:29:29 +02:00
30 lines
1.1 KiB
JavaScript
30 lines
1.1 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/. */
|
|
|
|
export const BYTES_IN_KILOBYTE = 1000;
|
|
export const BYTES_IN_MEGABYTE = 1000000;
|
|
|
|
export const BYTES_IN_KIBIBYTE = 1024;
|
|
export const BYTES_IN_MEBIBYTE = 1048576;
|
|
|
|
export const MeasurementUtils = {
|
|
/**
|
|
* Rounds byte sizes of user files in order to provide protection
|
|
* against fingerprinting.
|
|
*
|
|
* @param {number} bytes Number of bytes to fuzz
|
|
* @param {number} nearest Nearest number of bytes to round to
|
|
* @returns {number} Number of bytes rounded to the `nearest` granularity
|
|
*
|
|
* @example fuzzByteSize(1500, 1000) === 2000
|
|
* @example fuzzByteSize(1001, 1000) === 1000
|
|
* @example fuzzByteSize(1024, 10) === 1020
|
|
* @example fuzzByteSize(512, 1000) === 1000
|
|
* @example fuzzByteSize(256, 1000) === 1000
|
|
*/
|
|
fuzzByteSize(bytes, nearest) {
|
|
const fuzzed = Math.round(bytes / nearest) * nearest;
|
|
return Math.max(fuzzed, nearest);
|
|
},
|
|
};
|