从 utf8 到 latin1

Question

我有一个像这样的 utf-8 字符串：

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

我需要将字符串解码为 latin1。预期结果是：

àèìòù

这是我尝试过但没有成功的方法：

utf8.decode(stringData.runes.toList())

Answer 1

我解决了。
感谢@lenz 评论和找到的 js 函数 here 我用这个函数解决了：

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);
      });
}

并使用此代码：

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

从 utf8 到 latin1

from utf8 to latin1

decode

utf-8

dart