oh dear

mscorlib/System/Runtime/InteropServices/ICustomMarshaler.cs

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+using System;
+using Cpp2IlInjected;
+
+namespace System.Runtime.InteropServices
+{
+	/// <summary>Provides custom wrappers for handling method calls.</summary>
+	// Token: 0x02000580 RID: 1408
+	[Token(Token = "0x2000580")]
+	[ComVisible(true)]
+	public interface ICustomMarshaler
+	{
+		/// <summary>Converts the unmanaged data to managed data.</summary>
+		/// <param name="pNativeData">A pointer to the unmanaged data to be wrapped.</param>
+		/// <returns>An object that represents the managed view of the COM data.</returns>
+		// Token: 0x06002AB7 RID: 10935
+		[Token(Token = "0x6002AB7")]
+		[Address(Slot = "0")]
+		object MarshalNativeToManaged(IntPtr pNativeData);
+
+		/// <summary>Converts the managed data to unmanaged data.</summary>
+		/// <param name="ManagedObj">The managed object to be converted.</param>
+		/// <returns>A pointer to the COM view of the managed object.</returns>
+		// Token: 0x06002AB8 RID: 10936
+		[Token(Token = "0x6002AB8")]
+		[Address(Slot = "1")]
+		IntPtr MarshalManagedToNative(object ManagedObj);
+
+		/// <summary>Performs necessary cleanup of the unmanaged data when it is no longer needed.</summary>
+		/// <param name="pNativeData">A pointer to the unmanaged data to be destroyed.</param>
+		// Token: 0x06002AB9 RID: 10937
+		[Token(Token = "0x6002AB9")]
+		[Address(Slot = "2")]
+		void CleanUpNativeData(IntPtr pNativeData);
+
+		/// <summary>Performs necessary cleanup of the managed data when it is no longer needed.</summary>
+		/// <param name="ManagedObj">The managed object to be destroyed.</param>
+		// Token: 0x06002ABA RID: 10938
+		[Token(Token = "0x6002ABA")]
+		[Address(Slot = "3")]
+		void CleanUpManagedData(object ManagedObj);
+
+		/// <summary>Returns the size of the native data to be marshaled.</summary>
+		/// <returns>The size, in bytes, of the native data.</returns>
+		// Token: 0x06002ABB RID: 10939
+		[Token(Token = "0x6002ABB")]
+		[Address(Slot = "4")]
+		int GetNativeDataSize();
+	}
+}