From 456db46065524846156b4b3257a88e422aedd630 Mon Sep 17 00:00:00 2001
From: Coxxs <58-coxxs@users.noreply.git.ryujinx.app>
Date: Sun, 16 Nov 2025 18:24:41 -0600
Subject: [PATCH] Stub IWriterForApplication: 0 (CreateContextRegistrar)
 (ryubing/ryujinx!183)

See merge request ryubing/ryujinx!183
---
 src/Ryujinx.Common/Logging/LogClass.cs        |  1 +
 .../HOS/Services/Ectx/IContextRegistrar.cs    | 32 +++++++++++++++++++
 .../Services/Ectx/IWriterForApplication.cs    |  9 ++++++
 3 files changed, 42 insertions(+)
 create mode 100644 src/Ryujinx.HLE/HOS/Services/Ectx/IContextRegistrar.cs

diff --git a/src/Ryujinx.Common/Logging/LogClass.cs b/src/Ryujinx.Common/Logging/LogClass.cs
index 89f0336dc..eb0821db6 100644
--- a/src/Ryujinx.Common/Logging/LogClass.cs
+++ b/src/Ryujinx.Common/Logging/LogClass.cs
@@ -35,6 +35,7 @@ namespace Ryujinx.Common.Logging
         ServiceBsd,
         ServiceBtm,
         ServiceCaps,
+        ServiceEctx,
         ServiceFatal,
         ServiceFriend,
         ServiceFs,
diff --git a/src/Ryujinx.HLE/HOS/Services/Ectx/IContextRegistrar.cs b/src/Ryujinx.HLE/HOS/Services/Ectx/IContextRegistrar.cs
new file mode 100644
index 000000000..34adfe9be
--- /dev/null
+++ b/src/Ryujinx.HLE/HOS/Services/Ectx/IContextRegistrar.cs
@@ -0,0 +1,32 @@
+using System;
+using Ryujinx.Common.Logging;
+using Ryujinx.Horizon.Common;
+
+namespace Ryujinx.HLE.HOS.Services.Ectx
+{
+    class IContextRegistrar : DisposableIpcService
+    {
+        public IContextRegistrar(ServiceCtx context) { }
+
+        [CommandCmif(0)] // 11.0.0+
+        // Complete(nn::Result result, buffer<bytes, 5> raw_context) -> (i32 context_descriptor)
+        public ResultCode Complete(ServiceCtx context)
+        {
+            Result result = new(context.RequestData.ReadInt32());
+            ulong rawContextPosition = context.Request.SendBuff[0].Position;
+            ulong rawContextSize = context.Request.SendBuff[0].Size;
+
+            byte[] rawContext = new byte[rawContextSize];
+
+            context.Memory.Read(rawContextPosition, rawContext);
+
+            context.ResponseData.Write(0); // TODO: return context_descriptor
+
+            Logger.Stub?.PrintStub(LogClass.ServiceEctx, $"Result: {result}, rawContext: {Convert.ToHexString(rawContext)}" );
+
+            return ResultCode.Success;
+        }
+
+        protected override void Dispose(bool isDisposing) { }
+    }
+}
diff --git a/src/Ryujinx.HLE/HOS/Services/Ectx/IWriterForApplication.cs b/src/Ryujinx.HLE/HOS/Services/Ectx/IWriterForApplication.cs
index cf2cdddc2..c8ef155e3 100644
--- a/src/Ryujinx.HLE/HOS/Services/Ectx/IWriterForApplication.cs
+++ b/src/Ryujinx.HLE/HOS/Services/Ectx/IWriterForApplication.cs
@@ -4,5 +4,14 @@ namespace Ryujinx.HLE.HOS.Services.Ectx
     class IWriterForApplication : IpcService
     {
         public IWriterForApplication(ServiceCtx context) { }
+
+        [CommandCmif(0)]
+        // CreateContextRegistrar() -> object<nn::err::context::IContextRegistrar>
+        public ResultCode CreateContextRegistrar(ServiceCtx context)
+        {
+            MakeObject(context, new IContextRegistrar(context));
+
+            return ResultCode.Success;
+        }
     }
 }