1 files changed, 28 insertions, 0 deletions
diff --git a/src/Ryujinx.HLE/HOS/Services/Am/AppletAE/Storage/StorageHelper.cs b/src/Ryujinx.HLE/HOS/Services/Am/AppletAE/Storage/StorageHelper.cs
new file mode 100644
index 00000000..49e342f2
--- /dev/null
+++ b/src/Ryujinx.HLE/HOS/Services/Am/AppletAE/Storage/StorageHelper.cs
@@ -0,0 +1,28 @@
+using Ryujinx.Common.Memory;
+using Ryujinx.HLE.HOS.Services.Account.Acc;
+using System.IO;
+
+namespace Ryujinx.HLE.HOS.Services.Am.AppletAE.Storage
+{
+    class StorageHelper
+    {
+        private const uint LaunchParamsMagic = 0xc79497ca;
+
+        public static byte[] MakeLaunchParams(UserProfile userProfile)
+        {
+            // Size needs to be at least 0x88 bytes otherwise application errors.
+            using (MemoryStream ms = MemoryStreamManager.Shared.GetStream())
+            {
+                BinaryWriter writer = new BinaryWriter(ms);
+
+                ms.SetLength(0x88);
+
+                writer.Write(LaunchParamsMagic);
+                writer.Write(1);  // IsAccountSelected? Only lower 8 bits actually used.
+                userProfile.UserId.Write(writer);
+
+                return ms.ToArray();
+            }
+        }
+    }
+}