Consecutive control characters in Quoted Printable not decoding correctly

Question

I have a mail processing engine that reads in emails (usually UTF-8 encrypted) and processes them. I found a neat solution here for how to interpret the control characters. Bu

Answer 1

Here is a piece of code I found on SO looking for quoted printable :

private static string Decode(string input, string bodycharset)
{
    var i = 0;
    var output = new List<byte>();
    while (i < input.Length)
    {
        if (input[i] == '=' && input[i + 1] == '\r' && input[i + 2] == '\n')
        {
            //Skip
            i += 3;
        }
        else if (input[i] == '=')
        {
            string sHex = input;
            sHex = sHex.Substring(i + 1, 2);
            int hex = Convert.ToInt32(sHex, 16);
            byte b = Convert.ToByte(hex);
            output.Add(b);
            i += 3;
        }
        else
        {
            output.Add((byte)input[i]);
            i++;
        }
    }
    if (String.IsNullOrEmpty(bodycharset))
        return Encoding.UTF8.GetString(output.ToArray());
    else
        return Encoding.GetEncoding(bodycharset).GetString(output.ToArray());
}

Source : Decoding Quoted printable message

Decode("Elke=E2=80=99s motto", "utf-8") -> Elke’s motto