DotAtomReader.cs

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using System.Net.Mime;
 
namespace System.Net.Mail;
 
internal static class DotAtomReader
{
    internal static bool TryReadReverse(string data, int index, out int outIndex, bool throwExceptionIfFail)
    {
        int num = index;
        while (0 <= index && (data[index] > '\u007f' || data[index] == '.' || MailBnfHelper.Atext[(uint)data[index]]))
        {
            index--;
        }
        if (num == index)
        {
            if (throwExceptionIfFail)
            {
                throw new FormatException(System.SR.Format(System.SR.MailHeaderFieldInvalidCharacter, data[index]));
            }
            outIndex = 0;
            return false;
        }
        if (data[index + 1] == '.')
        {
            if (throwExceptionIfFail)
            {
                throw new FormatException(System.SR.Format(System.SR.MailHeaderFieldInvalidCharacter, '.'));
            }
            outIndex = 0;
            return false;
        }
        outIndex = index;
        return true;
    }
}