checkpoint

Alpm/PackageList.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+
+namespace Foodsoft.Alpm
+{
+    public struct PackageList : IEnumerable<Package>, IDisposable
+    {
+        private SafeListHandle<SafeDatabaseHandle> _handle;
+        private Database _db;
+
+        internal PackageList(SafeListHandle<SafeDatabaseHandle> handle, Database db)
+        {
+            _handle = handle;
+            _db = db;
+        }
+
+        public IEnumerator<Package> GetEnumerator()
+        {
+            var release = false;
+
+            RuntimeHelpers.PrepareConstrainedRegions();
+            try
+            {
+                _handle.DangerousAddRef(ref release);
+                if (!release) throw new ObjectDisposedException(_handle.GetType().FullName);
+                for (var list = _handle.DangerousGetHandle(); list != IntPtr.Zero; list = Wrapper.ListNext(list))
+                {
+                    yield return new CachePackage(
+                        new SafeCachePackageHandle(Wrapper.ListData(list), _handle.ParentHandle), _db);
+                }
+            }
+            finally
+            {
+                if (release)
+                    _handle.DangerousRelease();
+            }
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return GetEnumerator();
+        }
+
+        public void Dispose()
+        {
+            _handle.Dispose();
+        }
+    }
+}