checkpoint

Alpm/SafePackageHandle.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Runtime.ConstrainedExecution;
+using System.Runtime.InteropServices;
+
+namespace Foodsoft.Alpm
+{
+    internal class SafePackageHandle : SafeHandle
+    {
+        protected SafePackageHandle() : base(IntPtr.Zero, true) { }
+
+        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail), PrePrepareMethod]
+        protected override bool ReleaseHandle() => alpm.alpm_pkg_free(handle) == 0;
+
+        public override bool IsInvalid
+        {
+            [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success), PrePrepareMethod]
+            get => handle == IntPtr.Zero;
+        }
+    }
+}