Dump Windows ProductPolicy Structure in C#

dump_windows_productpolicy.cs

// dump ProductPolicy data structure from Windows
// ref: https://www.geoffchappell.com/studies/windows/km/ntoskrnl/api/ex/slmem/productpolicy.htm

using (var pok = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SYSTEM\ControlSet001\Control\ProductOptions", false))
{
	byte[] policy = (byte[])pok.GetValue(@"ProductPolicy");
	using (var ms = new MemoryStream(policy))
	using (var br = new BinaryReader(ms))
	{
		Console.WriteLine("total license data size (including header): {0}", br.ReadUInt32());
		Console.WriteLine("size of all entries: {0}", br.ReadUInt32());
		Console.WriteLine("size of of ending marker: {0}", br.ReadUInt32());
		Console.WriteLine("unknown: {0}", br.ReadUInt32());
		Console.WriteLine("license data version: {0}", br.ReadUInt32());
		Console.WriteLine();
		while (ms.Position < ms.Length)
		{
			var entryPos = ms.Position;
			var entrySize = br.ReadUInt16();
			Console.WriteLine("entry offset: 0x{0:X8}", ms.Position);
			Console.WriteLine("total size of entry: {0}", entrySize);
			ushort sizeOfName = br.ReadUInt16();
			if (entrySize == 69 /* nice */ && sizeOfName == 0)
			{
				Console.WriteLine();
				Console.WriteLine("No more entries.");
				break;
			}
			Console.WriteLine("size of name: {0}", sizeOfName);
			var dataType = br.ReadUInt16();
			Console.WriteLine("type of data: {0}", dataType);
			ushort sizeOfData = br.ReadUInt16();
			Console.WriteLine("size of data: {0}", sizeOfData);
			Console.WriteLine("flags: {0}", br.ReadUInt32());
			Console.WriteLine("unknown: {0}", br.ReadUInt32());
			Console.WriteLine("name offset: 0x{0:X8}", ms.Position);
			var nameBytes = br.ReadBytes(sizeOfName);
			Console.WriteLine("name: {0}", Encoding.Unicode.GetString(nameBytes, 0, nameBytes.Length));
			Console.WriteLine("data offset: 0x{0:X8}", ms.Position);
			var dataBytes = br.ReadBytes(sizeOfData);
			if (dataType == 4)
			{
				Console.WriteLine("value: {0}", BitConverter.ToUInt32(dataBytes, 0));
			}
			
			
			ms.Seek(entryPos + entrySize, SeekOrigin.Begin);
			Console.WriteLine();
		}
	}
}