Implement NGC service (#5681)

* Implement NGC service

* Use raw byte arrays instead of string for _wordSeparators

* Silence IDE0230 for _wordSeparators

* Try to silence warning about _rangeValuesCount not being read on SparseSet

* Make AcType enum private

* Add abstract methods and one TODO that I forgot

* PR feedback

* More PR feedback

* More PR feedback

3 files changed, 136 insertions, 0 deletions

diff --git a/src/Ryujinx.Horizon/Ngc/Ipc/Service.cs b/src/Ryujinx.Horizon/Ngc/Ipc/Service.cs
new file mode 100644
index 00000000..828c0919
--- /dev/null
+++ b/src/Ryujinx.Horizon/Ngc/Ipc/Service.cs
@@ -0,0 +1,64 @@
+using Ryujinx.Horizon.Common;
+using Ryujinx.Horizon.Sdk.Ngc;
+using Ryujinx.Horizon.Sdk.Ngc.Detail;
+using Ryujinx.Horizon.Sdk.Sf;
+using Ryujinx.Horizon.Sdk.Sf.Hipc;
+using System;
+
+namespace Ryujinx.Horizon.Ngc.Ipc
+{
+    partial class Service : INgcService
+    {
+        private readonly ProfanityFilter _profanityFilter;
+
+        public Service(ProfanityFilter profanityFilter)
+        {
+            _profanityFilter = profanityFilter;
+        }
+
+        [CmifCommand(0)]
+        public Result GetContentVersion(out uint version)
+        {
+            lock (_profanityFilter)
+            {
+                return _profanityFilter.GetContentVersion(out version);
+            }
+        }
+
+        [CmifCommand(1)]
+        public Result Check(out uint checkMask, ReadOnlySpan<byte> text, uint regionMask, ProfanityFilterOption option)
+        {
+            lock (_profanityFilter)
+            {
+                return _profanityFilter.CheckProfanityWords(out checkMask, text, regionMask, option);
+            }
+        }
+
+        [CmifCommand(2)]
+        public Result Mask(
+            out int maskedWordsCount,
+            [Buffer(HipcBufferFlags.Out | HipcBufferFlags.MapAlias)] Span<byte> filteredText,
+            [Buffer(HipcBufferFlags.In | HipcBufferFlags.MapAlias)] ReadOnlySpan<byte> text,
+            uint regionMask,
+            ProfanityFilterOption option)
+        {
+            lock (_profanityFilter)
+            {
+                int length = Math.Min(filteredText.Length, text.Length);
+
+                text[..length].CopyTo(filteredText[..length]);
+
+                return _profanityFilter.MaskProfanityWordsInText(out maskedWordsCount, filteredText, regionMask, option);
+            }
+        }
+
+        [CmifCommand(3)]
+        public Result Reload()
+        {
+            lock (_profanityFilter)
+            {
+                return _profanityFilter.Reload();
+            }
+        }
+    }
+}
diff --git a/src/Ryujinx.Horizon/Ngc/NgcIpcServer.cs b/src/Ryujinx.Horizon/Ngc/NgcIpcServer.cs
new file mode 100644
index 00000000..b2a74fb2
--- /dev/null
+++ b/src/Ryujinx.Horizon/Ngc/NgcIpcServer.cs
@@ -0,0 +1,51 @@
+using Ryujinx.Horizon.Ngc.Ipc;
+using Ryujinx.Horizon.Sdk.Fs;
+using Ryujinx.Horizon.Sdk.Ngc.Detail;
+using Ryujinx.Horizon.Sdk.Sf.Hipc;
+using Ryujinx.Horizon.Sdk.Sm;
+using System;
+
+namespace Ryujinx.Horizon.Ngc
+{
+    class NgcIpcServer
+    {
+        private const int MaxSessionsCount = 4;
+
+        private const int PointerBufferSize = 0;
+        private const int MaxDomains = 0;
+        private const int MaxDomainObjects = 0;
+        private const int MaxPortsCount = 1;
+
+        private static readonly ManagerOptions _options = new(PointerBufferSize, MaxDomains, MaxDomainObjects, false);
+
+        private SmApi _sm;
+        private ServerManager _serverManager;
+        private ProfanityFilter _profanityFilter;
+
+        public void Initialize(IFsClient fsClient)
+        {
+            HeapAllocator allocator = new();
+
+            _sm = new SmApi();
+            _sm.Initialize().AbortOnFailure();
+
+            _profanityFilter = new(fsClient);
+            _profanityFilter.Initialize().AbortOnFailure();
+
+            _serverManager = new ServerManager(allocator, _sm, MaxPortsCount, _options, MaxSessionsCount);
+
+            _serverManager.RegisterObjectForServer(new Service(_profanityFilter), ServiceName.Encode("ngc:u"), MaxSessionsCount);
+        }
+
+        public void ServiceRequests()
+        {
+            _serverManager.ServiceRequests();
+        }
+
+        public void Shutdown()
+        {
+            _serverManager.Dispose();
+            _profanityFilter.Dispose();
+        }
+    }
+}
diff --git a/src/Ryujinx.Horizon/Ngc/NgcMain.cs b/src/Ryujinx.Horizon/Ngc/NgcMain.cs
new file mode 100644
index 00000000..1a584d66
--- /dev/null
+++ b/src/Ryujinx.Horizon/Ngc/NgcMain.cs
@@ -0,0 +1,21 @@
+namespace Ryujinx.Horizon.Ngc
+{
+    class NgcMain : IService
+    {
+        public static void Main(ServiceTable serviceTable)
+        {
+            NgcIpcServer ipcServer = new();
+
+            ipcServer.Initialize(HorizonStatic.Options.FsClient);
+
+            // TODO: Notification thread, requires implementing OpenSystemDataUpdateEventNotifier on FS.
+            // The notification thread seems to wait until the event returned by OpenSystemDataUpdateEventNotifier is signalled
+            // in a loop. When it receives the signal, it calls ContentsReader.Reload and then waits for the next signal.
+
+            serviceTable.SignalServiceReady();
+
+            ipcServer.ServiceRequests();
+            ipcServer.Shutdown();
+        }
+    }
+}