ns/nim: Stub eShop related calls (#1420)

* ns/nim: Stub eShop related calls

As we aren't able to process purchase on the eShop throught the emulator, I have:
- Stub IPurchaseEventManager::SetDefaultDeliveryTarget (with RE check).
- Implement IPurchaseEventManager::GetPurchasedEventReadableHandle (with RE check).

As we can't do any eShop async call throught the emulator, I have:
- Stub IShopServiceAccessServerInterface::CreateServerInterface
- Stub IShopServiceAccessServer::CreateAccessorInterface
- Stub IShopServiceAccessor::IShopServiceAsync

Close #1084 and #1322

* fix handle copy

* Fix align

* Fix readonly event

Ryujinx.HLE/HOS/Services/Ns/IPurchaseEventManager.cs

@@ -1,8 +1,52 @@
+using Ryujinx.Common;
+using Ryujinx.Common.Logging;
+using Ryujinx.HLE.HOS.Ipc;
+using Ryujinx.HLE.HOS.Kernel.Common;
+using Ryujinx.HLE.HOS.Kernel.Threading;
+using System;
+
 namespace Ryujinx.HLE.HOS.Services.Ns
 {
     class IPurchaseEventManager : IpcService
     {
-        // TODO: Implement this
-        // Size seems to be atleast 0x7a8
+        private readonly KEvent _purchasedEvent;
+
+        public IPurchaseEventManager(Horizon system)
+        {
+            _purchasedEvent = new KEvent(system.KernelContext);
+        }
+
+        [Command(0)]
+        // SetDefaultDeliveryTarget(pid, buffer<bytes, 5> unknown)
+        public ResultCode SetDefaultDeliveryTarget(ServiceCtx context)
+        {
+            long   inBufferPosition = context.Request.SendBuff[0].Position;
+            long   inBufferSize     = context.Request.SendBuff[0].Size;
+            byte[] buffer           = new byte[inBufferSize];
+
+            context.Memory.Read((ulong)inBufferPosition, buffer);
+
+            // NOTE: Service use the pid to call arp:r GetApplicationLaunchProperty and store it in internal field.
+            //       Then it seems to use the buffer content and compare it with a stored linked instrusive list.
+            //       Since we don't support purchase from eShop, we can stub it.
+
+            Logger.PrintStub(LogClass.ServiceNs);
+
+            return ResultCode.Success;
+        }
+
+        [Command(2)]
+        // GetPurchasedEventReadableHandle() -> handle<copy, event>
+        public ResultCode GetPurchasedEventReadableHandle(ServiceCtx context)
+        {
+            if (context.Process.HandleTable.GenerateHandle(_purchasedEvent.ReadableEvent, out int handle) != KernelResult.Success)
+            {
+                throw new InvalidOperationException("Out of handles!");
+            }
+
+            context.Response.HandleDesc = IpcHandleDesc.MakeCopy(handle);
+
+            return ResultCode.Success;
+        }
     }
 }