PHP's quoted_printable_decode in JavaScript

How to use

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

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	quoted_printable_decode('a=3Db=3Dc')	'a=b=c'
2	quoted_printable_decode('abc =20\r\n123 =20\r\n')	'abc \r\n123 \r\n'
3	quoted_printable_decode('012345678901234567890123456789012345678901234567890123456789012345678901234=\r\n56789')	'01234567890123456789012345678901234567890123456789012345678901234567890123456789'
4	quoted_printable_decode("Lorem ipsum dolor sit amet=23, consectetur adipisicing elit")	'Lorem ipsum dolor sit amet#, consectetur adipisicing elit'

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

module.exports = function quoted_printable_decode(str) {
  //       discuss at: https://locutus.io/php/quoted_printable_decode/
  //      original by: Ole Vrijenhoek
  //      bugfixed by: Brett Zamir (https://brett-zamir.me)
  //      bugfixed by: Theriault (https://github.com/Theriault)
  // reimplemented by: Theriault (https://github.com/Theriault)
  //      improved by: Brett Zamir (https://brett-zamir.me)
  //        example 1: quoted_printable_decode('a=3Db=3Dc')
  //        returns 1: 'a=b=c'
  //        example 2: quoted_printable_decode('abc  =20\r\n123  =20\r\n')
  //        returns 2: 'abc   \r\n123   \r\n'
  //        example 3: quoted_printable_decode('012345678901234567890123456789012345678901234567890123456789012345678901234=\r\n56789')
  //        returns 3: '01234567890123456789012345678901234567890123456789012345678901234567890123456789'
  //        example 4: quoted_printable_decode("Lorem ipsum dolor sit amet=23, consectetur adipisicing elit")
  //        returns 4: 'Lorem ipsum dolor sit amet#, consectetur adipisicing elit'

  // Decodes all equal signs followed by two hex digits
  const RFC2045Decode1 = /=\r\n/gm

  // the RFC states against decoding lower case encodings, but following apparent PHP behavior
  const RFC2045Decode2IN = /=([0-9A-F]{2})/gim
  // RFC2045Decode2IN = /=([0-9A-F]{2})/gm,

  const RFC2045Decode2OUT = function (sMatch, sHex) {
    return String.fromCharCode(parseInt(sHex, 16))
  }

  return str.replace(RFC2045Decode1, '').replace(RFC2045Decode2IN, RFC2045Decode2OUT)
}

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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