checkpoint

Alpm/SafeFilePackageHandle.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.ConstrainedExecution;
+using System.Runtime.InteropServices;
+
+namespace Foodsoft.Alpm
+{
+    internal class SafeFilePackageHandle : SafePackageHandle
+    {
+        internal SafeAlpmHandle SafeAlpmHandle { get; } = null!;
+            
+        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
+        [PrePrepareMethod]
+        internal SafeFilePackageHandle(IntPtr ptr, SafeAlpmHandle parentHandle)
+        {
+            var success = false;
+
+            RuntimeHelpers.PrepareConstrainedRegions();
+            try { }
+            finally
+            {
+                parentHandle.DangerousAddRef(ref success);
+                if (success)
+                {
+                    SafeAlpmHandle = parentHandle;
+                    handle = ptr;
+                }
+            }
+
+            if (!success) throw new ObjectDisposedException(GetType().FullName);
+        }
+
+        protected override bool ReleaseHandle()
+        {
+            SafeAlpmHandle.DangerousRelease();
+            return true;
+        }
+    }
+}