private static void EncodeToBuffer(string value, StringBuilder builder, bool allowUnicode)
{
Encoding?encoding = MimeBasePart.DecodeEncoding(value);
if (encoding != null) // Manually encoded elsewhere, pass through
{
builder.Append('\"').Append(value).Append('"');
}
else if ((allowUnicode && !MailBnfHelper.HasCROrLF(value)) || // Unicode without CL or LF's
MimeBasePart.IsAscii(value, false)) // Ascii
{
MailBnfHelper.GetTokenOrQuotedString(value, builder, allowUnicode);
}
else
{
// MIME Encoding required
encoding = Encoding.GetEncoding(MimeBasePart.DefaultCharSet);
builder.Append('"').Append(MimeBasePart.EncodeHeaderValue(value, encoding, MimeBasePart.ShouldUseBase64Encoding(encoding))).Append('"');
}
}