Call RtlIsNameInExpression from .Net code

Because of a lot of intricacies in filename patternmatching in Windows (and former DOS) I'd like to call RtlIsNameInExpression from my .Net code to make sure my (console) application will behave identical to Windows applications. However, I don't seem to be able to find how to PInvoke this function; I have no idea what the DllImport should look like and I am unable to find any examples nor anything useful on pinvoke.net.

Any help would be appreciated!

EDIT: I was blind. I was googling FsRtlIsNameInExpression where I should've been googling RtlIsNameInExpression (explanation here).

Anyway; found something here and that seems to work.

Solution 1:

Found the below code here. Posting / answering my own question to make sure it doesn't get lost. All credit to David Růžička

// UNICODE_STRING for Rtl... method
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct UNICODE_STRING
{
    public ushort Length;
    public ushort MaximumLength;
    [MarshalAs(UnmanagedType.LPWStr)]
    string Buffer;

    public UNICODE_STRING(string buffer)
    {
        if (buffer == null)
            Length = MaximumLength = 0;
        else
            Length = MaximumLength = unchecked((ushort)(buffer.Length * 2));
        Buffer = buffer;
    }
}

// RtlIsNameInExpression method from NtDll.dll system library
public static class NtDll
{
    [DllImport("NtDll.dll", CharSet=CharSet.Unicode, ExactSpelling=true)]
    [return: MarshalAs(UnmanagedType.U1)]
    public extern static bool RtlIsNameInExpression(
        ref UNICODE_STRING Expression,
        ref UNICODE_STRING Name,
        [MarshalAs(UnmanagedType.U1)]
        bool IgnoreCase,
        IntPtr Zero
        );
}

public bool MatchMask(string mask, string fileName)
{
    // Expression must be uppercase for IgnoreCase == true (see MSDN for RtlIsNameInExpression)
    UNICODE_STRING expr = new UNICODE_STRING(mask.ToUpper());
    UNICODE_STRING name = new UNICODE_STRING(fileName);

    if (NtDll.RtlIsNameInExpression(ref expr, ref name, true, IntPtr.Zero))
    {
        // MATCHES !!!
    }
}