locutus/esm/php/strings/convert_uuencode.js

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

import { is_scalar as isScalar } from "../var/is_scalar.js";
export function convert_uuencode(str) {
    //       discuss at: https://locutus.io/php/convert_uuencode/
    //      original by: Ole Vrijenhoek
    //      bugfixed by: Kevin van Zonneveld (https://kvz.io)
    //      bugfixed by: Brett Zamir (https://brett-zamir.me)
    // reimplemented by: Ole Vrijenhoek
    //        example 1: convert_uuencode("test\ntext text\r\n")
    //        returns 1: "0=&5S=`IT97AT('1E>'0-\"@\n`\n"
    const chr = function (c) {
        return String.fromCharCode(c);
    };
    if (!str || str === '') {
        return chr(0);
    }
    else if (!isScalar(str)) {
        return false;
    }
    const source = String(str);
    let c = 0;
    let u = 0;
    let a = 0;
    let encoded = '';
    let tmp1 = '';
    let tmp2 = '';
    let bytes = [];
    // divide string into chunks of 45 characters
    const chunk = function () {
        bytes = source
            .substr(u, 45)
            .split('')
            .map((char) => char.charCodeAt(0));
        return bytes.length || 0;
    };
    while ((c = chunk()) !== 0) {
        u += 45;
        // New line encoded data starts with number of bytes encoded.
        encoded += chr(c + 32);
        // Convert each char in bytes[] to a byte
        for (const byte of bytes) {
            tmp1 = byte.toString(2);
            while (tmp1.length < 8) {
                tmp1 = '0' + tmp1;
            }
            tmp2 += tmp1;
        }
        while (tmp2.length % 6) {
            tmp2 = tmp2 + '0';
        }
        for (let i = 0; i <= tmp2.length / 6 - 1; i++) {
            tmp1 = tmp2.substr(a, 6);
            if (tmp1 === '000000') {
                encoded += chr(96);
            }
            else {
                encoded += chr(parseInt(tmp1, 2) + 32);
            }
            a += 6;
        }
        a = 0;
        tmp2 = '';
        encoded += '\n';
    }
    // Add termination characters
    encoded += chr(96) + '\n';
    return encoded;
}