code: function qpdecode(callback) {
        return function(data) {
          var string = callback(data);
  
          return string
            .replace(/[\t\x20]$/gm, '')
            .replace(/=(?:\r\n?|\n|$)/g, '')
            .replace(/=([a-fA-F0-9]{2})/g, function($0, $1) {
              var codePoint = parseInt($1, 16);
              return String.fromCharCode(codePoint);
            });
        }
      }
docs: quoted-printable decode