1 files changed, 87 insertions, 0 deletions

diff --git a/src/WixToolset.Core/Bind/FileSystem.cs b/src/WixToolset.Core/Bind/FileSystem.cs
new file mode 100644
index 00000000..7d1b223e
--- /dev/null
+++ b/src/WixToolset.Core/Bind/FileSystem.cs
@@ -0,0 +1,87 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Core.Bind
+{
+    using System;
+    using System.Collections.Generic;
+    using System.IO;
+    using System.Runtime.InteropServices;
+    using WixToolset.Extensibility;
+
+    internal class FileSystem
+    {
+        public FileSystem(IEnumerable<IFileSystemExtension> extensions)
+        {
+            this.Extensions = extensions ?? Array.Empty<IFileSystemExtension>();
+        }
+
+        private IEnumerable<IFileSystemExtension> Extensions { get; }
+
+        /// <summary>
+        /// Copies a file.
+        /// </summary>
+        /// <param name="source">The file to copy.</param>
+        /// <param name="destination">The destination file.</param>
+        /// <param name="overwrite">true if the destination file can be overwritten; otherwise, false.</param>
+        public bool CopyFile(string source, string destination, bool overwrite)
+        {
+            foreach (var extension in this.Extensions)
+            {
+                if (extension.CopyFile(source, destination, overwrite))
+                {
+                    return true;
+                }
+            }
+
+            if (overwrite && File.Exists(destination))
+            {
+                File.Delete(destination);
+            }
+
+            if (!CreateHardLink(destination, source, IntPtr.Zero))
+            {
+#if DEBUG
+                int er = Marshal.GetLastWin32Error();
+#endif
+
+                File.Copy(source, destination, overwrite);
+            }
+
+            return true;
+        }
+
+        /// <summary>
+        /// Moves a file.
+        /// </summary>
+        /// <param name="source">The file to move.</param>
+        /// <param name="destination">The destination file.</param>
+        public bool MoveFile(string source, string destination, bool overwrite)
+        {
+            foreach (var extension in this.Extensions)
+            {
+                if (extension.MoveFile(source, destination, overwrite))
+                {
+                    return true;
+                }
+            }
+
+            if (overwrite && File.Exists(destination))
+            {
+                File.Delete(destination);
+            }
+
+            var directory = Path.GetDirectoryName(destination);
+            if (!String.IsNullOrEmpty(directory))
+            {
+                Directory.CreateDirectory(directory);
+            }
+
+            File.Move(source, destination);
+
+            return true;
+        }
+
+        [DllImport("Kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
+        private static extern bool CreateHardLink(string lpFileName, string lpExistingFileName, IntPtr lpSecurityAttributes);
+    }
+}