locutus/php/network/inet_ntop.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.inet_ntop = inet_ntop;
function inet_ntop(a) {
    //  discuss at: https://locutus.io/php/inet_ntop/
    // original by: Theriault (https://github.com/Theriault)
    //   example 1: inet_ntop('\x7F\x00\x00\x01')
    //   returns 1: '127.0.0.1'
    //   _example 2: inet_ntop('\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1')
    //   _returns 2: '::1'
    let i = 0;
    let m = '';
    const c = [];
    const address = String(a);
    if (address.length === 4) {
        // IPv4
        return [address.charCodeAt(0), address.charCodeAt(1), address.charCodeAt(2), address.charCodeAt(3)].join('.');
    }
    else if (address.length === 16) {
        // IPv6
        for (i = 0; i < 16; i++) {
            c.push(((address.charCodeAt(i++) << 8) + address.charCodeAt(i)).toString(16));
        }
        return c
            .join(':')
            .replace(/((^|:)0(?=:|$))+:?/g, function (t) {
            m = t.length > m.length ? t : m;
            return t;
        })
            .replace(m || ' ', '::');
    }
    else {
        // Invalid length
        return false;
    }
}