143 lines
2.5 KiB
JavaScript
143 lines
2.5 KiB
JavaScript
/*!
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* util.js - utils for hsk
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* Copyright (c) 2017-2018, Christopher Jeffrey (MIT License).
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* https://github.com/handshakecompany/hsk
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*/
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'use strict';
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const assert = require('assert');
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/**
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* @exports utils/util
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*/
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const util = exports;
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/**
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* Return hrtime (shim for browser).
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* @param {Array} time
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* @returns {Array} [seconds, nanoseconds]
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*/
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util.bench = function bench(time) {
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if (!process.hrtime) {
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const now = Date.now();
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if (time) {
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const [hi, lo] = time;
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const start = hi * 1000 + lo / 1e6;
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return now - start;
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}
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const ms = now % 1000;
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// Seconds
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const hi = (now - ms) / 1000;
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// Nanoseconds
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const lo = ms * 1e6;
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return [hi, lo];
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}
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if (time) {
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const [hi, lo] = process.hrtime(time);
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return hi * 1000 + lo / 1e6;
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}
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return process.hrtime();
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};
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/**
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* Get current time in unix time (seconds).
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* @returns {Number}
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*/
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util.now = function now() {
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return Math.floor(Date.now() / 1000);
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};
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/**
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* Get current time in unix time (milliseconds).
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* @returns {Number}
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*/
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util.ms = function ms() {
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return Date.now();
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};
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/**
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* Create a Date ISO string from time in unix time (seconds).
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* @param {Number?} time - Seconds in unix time.
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* @returns {String}
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*/
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util.date = function date(time) {
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if (time == null)
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time = util.now();
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return new Date(time * 1000).toISOString().slice(0, -5) + 'Z';
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};
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/**
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* Get unix seconds from a Date string.
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* @param {String?} date - Date ISO String.
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* @returns {Number}
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*/
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util.time = function time(date) {
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if (date == null)
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return util.now();
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return new Date(date) / 1000 | 0;
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};
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/**
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* Reverse a hex-string.
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* @param {String} str - Hex string.
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* @returns {String} Reversed hex string.
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*/
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util.revHex = function revHex(str) {
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assert(typeof str === 'string');
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assert((str.length & 1) === 0);
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let out = '';
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for (let i = str.length - 2; i >= 0; i -= 2)
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out += str[i] + str[i + 1];
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return out;
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};
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/**
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* Convert u32 to padded hex.
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* @param {Number} num
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* @returns {String}
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*/
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util.hex32 = function hex32(num) {
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assert((num >>> 0) === num);
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num = num.toString(16);
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switch (num.length) {
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case 1:
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return `0000000${num}`;
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case 2:
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return `000000${num}`;
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case 3:
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return `00000${num}`;
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case 4:
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return `0000${num}`;
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case 5:
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return `000${num}`;
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case 6:
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return `00${num}`;
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case 7:
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return `0${num}`;
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case 8:
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return `${num}`;
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default:
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throw new Error();
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}
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};
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