checkpoint

Alpm/UTF8InMarshaler.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace Foodsoft.Alpm
+{
+    internal readonly struct UTF8InMarshaler : ICustomMarshaler
+    {
+        private static readonly UTF8InMarshaler _instance = default;
+
+        public void CleanUpManagedData(object managedObj) { }
+
+        public void CleanUpNativeData(IntPtr pNativeData)
+        {
+            if (pNativeData == IntPtr.Zero)
+                return;
+            Marshal.FreeHGlobal(pNativeData);
+        }
+
+        public int GetNativeDataSize() => -1;
+
+        public unsafe IntPtr MarshalManagedToNative(object? managedObj)
+        {
+            if (managedObj is null) return IntPtr.Zero;
+
+            var s = (string) managedObj;
+
+            var nb = Encoding.UTF8.GetMaxByteCount(s.Length);
+
+            var pMem = Marshal.AllocHGlobal(nb + 1);
+            var pbMem = (byte*) pMem;
+
+            int nbWritten;
+            fixed (char* firstChar = s)
+            {
+                nbWritten = Encoding.UTF8.GetBytes(firstChar, s.Length, pbMem, nb);
+            }
+
+            pbMem[nbWritten] = 0;
+            return pMem;
+        }
+
+        public object MarshalNativeToManaged(IntPtr pNativeData)
+        {
+            return Marshal.PtrToStringUTF8(pNativeData)!;
+        }
+
+        // ReSharper disable once UnusedMember.Local
+        // ReSharper disable once UnusedParameter.Local
+        private static ICustomMarshaler GetInstance(string cookie)
+        {
+            return _instance;
+        }
+    }
+}