PHP's convert_uuencode in JavaScript

How to use

You you can install via yarn add locutus and require this function via const convert_uuencode = require('locutus/php/strings/convert_uuencode').

It is important to use a bundler that supports tree-shaking so that you only ship the functions that you actually use to your browser, instead of all of Locutus, which is massive. Examples are: Parcel, webpack, or rollup.js. For server-side use this is typically less of a concern.

Examples

Please note that these examples are distilled from test cases that automatically verify our functions still work correctly. This could explain some quirky ones.

#	code	expected result
1	convert_uuencode("test\ntext text\r\n")	"0=&5S=`IT97AT('1E>'0-\"@\n`\n"

Here’s what our current JavaScript equivalent to PHP's convert_uuencode looks like.

module.exports = 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 isScalar = require('../var/is_scalar')

  const chr = function (c) {
    return String.fromCharCode(c)
  }

  if (!str || str === '') {
    return chr(0)
  } else if (!isScalar(str)) {
    return false
  }

  let c = 0
  let u = 0
  let i = 0
  let a = 0
  let encoded = ''
  let tmp1 = ''
  let tmp2 = ''
  let bytes = {}

  // divide string into chunks of 45 characters
  const chunk = function () {
    bytes = str.substr(u, 45).split('')
    for (i in bytes) {
      bytes[i] = bytes[i].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 (i in bytes) {
      tmp1 = bytes[i].toString(2)
      while (tmp1.length < 8) {
        tmp1 = '0' + tmp1
      }
      tmp2 += tmp1
    }

    while (tmp2.length % 6) {
      tmp2 = tmp2 + '0'
    }

    for (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
}

A community effort

Not unlike Wikipedia, Locutus is an ongoing community effort. Our philosophy follows The McDonald’s Theory. This means that we assimilate first iterations with imperfections, hoping for others to take issue with-and improve them. This unorthodox approach has worked very well to foster fun and fruitful collaboration, but please be reminded to use our creations at your own risk. THE SOFTWARE IS PROVIDED "AS IS" has never been more true than for Locutus.

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