ByteHelpers.cs

using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;

namespace Dat.FileParsing;

public static class ByteHelpers
{
	public static int GetObjectSize([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)] Type type)
	{
		var size = 0;
		if (type == typeof(byte) || type == typeof(sbyte))
		{
			size = 1;
		}
		else if (type == typeof(uint16_t) || type == typeof(int16_t))
		{
			size = 2;
		}
		else if (type == typeof(uint32_t) || type == typeof(int32_t))
		{
			size = 4;
		}
		else if (type.IsEnum)
		{
			size = Marshal.SizeOf(type.GetEnumUnderlyingType());
		}
		else
		{
			var sizeAttr = AttributeHelper.Get<LocoStructSizeAttribute>(type) ?? throw new ArgumentOutOfRangeException(nameof(LocoStructSizeAttribute), $"type {type} didn't have LocoStructSizeAttribute");
			size = sizeAttr.Size;
		}

		ArgumentOutOfRangeException.ThrowIfNegativeOrZero(size, nameof(size));

		return size;
	}
}