from utf8 to latin1

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I have an utf-8 string like this:

=C3=A0=C3=A8=C3=AC=C3=B2=C3=B9

I need to decode the string to latin1. The expected result is:

àèìòù

This is what I tried without success:

utf8.decode(stringData.runes.toList())
dart decode utf-8
1 Answers

I solved.
Thanks to @lenz comment and the js function found here I solved with this function:

String decodeQuotedPrintable(String input) {
  return input
      // https://tools.ietf.org/html/rfc2045#section-6.7, rule 3:
      // “Therefore, when decoding a `Quoted-Printable` body, any trailing white
      // space on a line must be deleted, as it will necessarily have been added
      // by intermediate transport agents.”
      .replaceAll(RegExp(r'[\t\x20]$', multiLine: true), '')
      // Remove hard line breaks preceded by `=`. Proper `Quoted-Printable`-
      // encoded data only contains CRLF line endings, but for compatibility
      // reasons we support separate CR and LF too.
      .replaceAll(RegExp(r'=(?:\r\n?|\n|$)', multiLine: true), '')
      // Decode escape sequences of the form `=XX` where `XX` is any
      // combination of two hexidecimal digits. For optimal compatibility,
      // lowercase hexadecimal digits are supported as well. See
      // https://tools.ietf.org/html/rfc2045#section-6.7, note 1.
      .replaceAllMapped(RegExp(r'=([a-fA-F\d]{2})'), (match) {
        var codePoint = int.parse(match[1], radix: 16);
        return String.fromCharCode(codePoint);
      });
}

and with this code:

var output = decodeQuotedPrintable(input);
output = utf8.decode(latin1.encode(input));
user_46410730
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