@hamstudy/flamp/dist/base64.js

JavaScript Amateur Multicast Protocol AMP-2 Version 3 Implemented from specification document http://www.w1hkj.com/files/flamp/Amp-2.V3.0.Protocol.pdf • Version 1.0.0 - W5ALT, Walt Fair, Jr. (Derived From) • Version 2.0.0 - W1HKJ, Dave Freese, w

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.encode = encode64;
exports.decode = decode64;
// Adapted from http://ntt.cc/2008/01/19/base64-encoder-decoder-with-javascript.html
//
// There was no clear license specified; if you are the copyright holder and would
// prefer we not use (or can tell us who to attribute the code to) this please let us know
// so we can update things!
//
const keyStr = "ABCDEFGHIJKLMNOP" +
    "QRSTUVWXYZabcdef" +
    "ghijklmnopqrstuv" +
    "wxyz0123456789+/" +
    "=";
function encode64(input) {
    var output = "";
    var chr1, chr2, chr3;
    var enc1, enc2, enc3, enc4;
    var i = 0;
    do {
        chr1 = input.charCodeAt(i++);
        chr2 = input.charCodeAt(i++);
        chr3 = input.charCodeAt(i++);
        enc1 = chr1 >> 2;
        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
        enc4 = chr3 & 63;
        if (isNaN(chr2)) {
            enc3 = enc4 = 64;
        }
        else if (isNaN(chr3)) {
            enc4 = 64;
        }
        output = output +
            keyStr.charAt(enc1) +
            keyStr.charAt(enc2) +
            keyStr.charAt(enc3) +
            keyStr.charAt(enc4);
        chr1 = chr2 = chr3 = 0;
        enc1 = enc2 = enc3 = enc4 = 0;
    } while (i < input.length);
    return output;
}
function decode64(input) {
    var output = "";
    var chr1, chr2, chr3;
    var enc1, enc2, enc3, enc4;
    var i = 0;
    // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
    var base64test = /[^A-Za-z0-9\+\/\=]/g;
    if (base64test.exec(input)) {
        throw new Error("Invalid base64 characters");
    }
    input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
    do {
        enc1 = keyStr.indexOf(input.charAt(i++));
        enc2 = keyStr.indexOf(input.charAt(i++));
        enc3 = keyStr.indexOf(input.charAt(i++));
        enc4 = keyStr.indexOf(input.charAt(i++));
        chr1 = (enc1 << 2) | (enc2 >> 4);
        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
        chr3 = ((enc3 & 3) << 6) | enc4;
        output = output + String.fromCharCode(chr1);
        if (enc3 != 64) {
            output = output + String.fromCharCode(chr2);
        }
        if (enc4 != 64) {
            output = output + String.fromCharCode(chr3);
        }
        chr1 = chr2 = chr3 = 0;
        enc1 = enc2 = enc3 = enc4 = 0;
    } while (i < input.length);
    return unescape(output);
}