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using System;
using System.Reflection;
namespace Ryujinx.Graphics.Device
{
public static class SizeCalculator
{
public static int SizeOf(Type type)
{
// Is type a enum type?
if (type.IsEnum)
{
type = type.GetEnumUnderlyingType();
}
// Is type a pointer type?
if (type.IsPointer || type == typeof(IntPtr) || type == typeof(UIntPtr))
{
return IntPtr.Size;
}
// Is type a struct type?
if (type.IsValueType && !type.IsPrimitive)
{
// Check if the struct has a explicit size, if so, return that.
if (type.StructLayoutAttribute.Size != 0)
{
return type.StructLayoutAttribute.Size;
}
// Otherwise we calculate the sum of the sizes of all fields.
int size = 0;
var fields = type.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
for (int fieldIndex = 0; fieldIndex < fields.Length; fieldIndex++)
{
size += SizeOf(fields[fieldIndex].FieldType);
}
return size;
}
// Primitive types.
return (Type.GetTypeCode(type)) switch
{
TypeCode.SByte => sizeof(sbyte),
TypeCode.Byte => sizeof(byte),
TypeCode.Int16 => sizeof(short),
TypeCode.UInt16 => sizeof(ushort),
TypeCode.Int32 => sizeof(int),
TypeCode.UInt32 => sizeof(uint),
TypeCode.Int64 => sizeof(long),
TypeCode.UInt64 => sizeof(ulong),
TypeCode.Char => sizeof(char),
TypeCode.Single => sizeof(float),
TypeCode.Double => sizeof(double),
TypeCode.Decimal => sizeof(decimal),
TypeCode.Boolean => sizeof(bool),
_ => throw new ArgumentException($"Length for type \"{type.Name}\" is unknown."),
};
}
}
}
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