/// <summary>
/// Get <see cref="IntPtr"/> address from <typeparamref name="T"/> <paramref name="obj"/>
/// with type <paramref name="pointerType"/>
/// </summary>
/// <typeparam name="T">Type of object</typeparam>
/// <param name="obj">source object</param>
/// <param name="pointerType">type of address</param>
/// <returns><see cref="IntPtr"/> address with requested type</returns>
public static IntPtr GetAddress <T>(this T obj, ObjectPointerTo pointerType) where T : class
{
if (obj == null)
{
return(IntPtr.Zero);
}
var finder = new FindAddressHelper <T> {
Object = obj
};
var addr = &finder.Address;
IntPtr ptr = *(IntPtr *)&addr[-1];
switch (pointerType)
{
case ObjectPointerTo.MethodTablePointer:
break;
case ObjectPointerTo.Header:
ptr = IntPtr.Add(ptr, -IntPtr.Size);
break;
case ObjectPointerTo.Data:
ptr = IntPtr.Add(ptr, IntPtr.Size);
break;
default:
throw new ArgumentException("Unknown type of requested address", nameof(pointerType));
}
return(ptr);
}
/// <summary>
/// Cast <see cref="IntPtr"/> to <typeparamref name="TResult"/>
/// </summary>
/// <typeparam name="TResult">result type</typeparam>
/// <param name="address">pointer to object</param>
/// <param name="pointerType">address type</param>
/// <returns>casted object</returns>
public static TResult ToObject <TResult>(this IntPtr address, ObjectPointerTo pointerType) where TResult : class
{
var finder = new FindAddressHelper <TResult>();
var addr = &finder.Address;
var ptr = address;
if (ptr != IntPtr.Zero)
{
switch (pointerType)
{
case ObjectPointerTo.MethodTablePointer:
break;
case ObjectPointerTo.Header:
ptr = IntPtr.Add(ptr, IntPtr.Size);
break;
case ObjectPointerTo.Data:
ptr = IntPtr.Add(ptr, -IntPtr.Size);
break;
default:
throw new ArgumentException("Unknown type of address", nameof(pointerType));
}
}
*(IntPtr *)&addr[-1] = ptr;
return(finder.Object);
}
