UncNameHelper.cs

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namespace System;
 
internal static class UncNameHelper
{
    public static string ParseCanonicalName(string str, int start, int end, ref bool loopback)
    {
        return DomainNameHelper.ParseCanonicalName(str, start, end, ref loopback);
    }
 
    public unsafe static bool IsValid(char* name, int start, ref int returnedEnd, bool notImplicitFile)
    {
        int num = returnedEnd;
        if (start == num)
        {
            return false;
        }
        bool flag = false;
        int i;
        for (i = start; i < num; i++)
        {
            if (name[i] == '/' || name[i] == '\\' || (notImplicitFile && (name[i] == ':' || name[i] == '?' || name[i] == '#')))
            {
                num = i;
                break;
            }
            if (name[i] == '.')
            {
                i++;
                break;
            }
            if (char.IsLetter(name[i]) || name[i] == '-' || name[i] == '_')
            {
                flag = true;
            }
            else if (name[i] < '0' || name[i] > '9')
            {
                return false;
            }
        }
        if (!flag)
        {
            return false;
        }
        for (; i < num; i++)
        {
            if (name[i] == '/' || name[i] == '\\' || (notImplicitFile && (name[i] == ':' || name[i] == '?' || name[i] == '#')))
            {
                num = i;
                break;
            }
            if (name[i] == '.')
            {
                if (!flag || (i - 1 >= start && name[i - 1] == '.'))
                {
                    return false;
                }
                flag = false;
                continue;
            }
            if (name[i] == '-' || name[i] == '_')
            {
                if (!flag)
                {
                    return false;
                }
                continue;
            }
            if (char.IsLetter(name[i]) || (name[i] >= '0' && name[i] <= '9'))
            {
                if (!flag)
                {
                    flag = true;
                }
                continue;
            }
            return false;
        }
        if (i - 1 >= start && name[i - 1] == '.')
        {
            flag = true;
        }
        if (!flag)
        {
            return false;
        }
        returnedEnd = num;
        return true;
    }
}