1 files changed, 113 insertions, 0 deletions

diff --git a/src/WixToolset.Core.Native/Msi/Installer.cs b/src/WixToolset.Core.Native/Msi/Installer.cs
new file mode 100644
index 00000000..2bb41078
--- /dev/null
+++ b/src/WixToolset.Core.Native/Msi/Installer.cs
@@ -0,0 +1,113 @@
+// 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.Native.Msi
+{
+    using System;
+    using System.Diagnostics;
+    using System.Text;
+
+    /// <summary>
+    /// A callback function that the installer calls for progress notification and error messages.
+    /// </summary>
+    /// <param name="context">Pointer to an application context.
+    /// This parameter can be used for error checking.</param>
+    /// <param name="messageType">Specifies a combination of one message box style,
+    /// one message box icon type, one default button, and one installation message type.</param>
+    /// <param name="message">Specifies the message text.</param>
+    /// <returns>-1 for an error, 0 if no action was taken, 1 if OK, 3 to abort.</returns>
+    public delegate int InstallUIHandler(IntPtr context, uint messageType, string message);
+
+    /// <summary>
+    /// Represents the Windows Installer, provides wrappers to
+    /// create the top-level objects and access their methods.
+    /// </summary>
+    public static class Installer
+    {
+        /// <summary>
+        /// Takes the path to a file and returns a 128-bit hash of that file.
+        /// </summary>
+        /// <param name="filePath">Path to file that is to be hashed.</param>
+        /// <param name="options">The value in this column must be 0. This parameter is reserved for future use.</param>
+        /// <param name="hash">Int array that receives the returned file hash information.</param>
+        public static void GetFileHash(string filePath, int options, out int[] hash)
+        {
+            var hashInterop = new MSIFILEHASHINFO();
+            hashInterop.FileHashInfoSize = 20;
+
+            var error = MsiInterop.MsiGetFileHash(filePath, Convert.ToUInt32(options), hashInterop);
+            if (0 != error)
+            {
+                throw new MsiException(error);
+            }
+
+            Debug.Assert(20 == hashInterop.FileHashInfoSize);
+
+            hash = new int[4];
+            hash[0] = hashInterop.Data0;
+            hash[1] = hashInterop.Data1;
+            hash[2] = hashInterop.Data2;
+            hash[3] = hashInterop.Data3;
+        }
+
+        /// <summary>
+        /// Returns the version string and language string in the format that the installer 
+        /// expects to find them in the database.  If you just want version information, set 
+        /// lpLangBuf and pcchLangBuf to zero. If you just want language information, set 
+        /// lpVersionBuf and pcchVersionBuf to zero.
+        /// </summary>
+        /// <param name="filePath">Specifies the path to the file.</param>
+        /// <param name="version">Returns the file version. Set to 0 for language information only.</param>
+        /// <param name="language">Returns the file language. Set to 0 for version information only.</param>
+        public static void GetFileVersion(string filePath, out string version, out string language)
+        {
+            var versionLength = 20;
+            var languageLength = 20;
+            var versionBuffer = new StringBuilder(versionLength);
+            var languageBuffer = new StringBuilder(languageLength);
+
+            var error = MsiInterop.MsiGetFileVersion(filePath, versionBuffer, ref versionLength, languageBuffer, ref languageLength);
+            if (234 == error)
+            {
+                versionBuffer.EnsureCapacity(++versionLength);
+                languageBuffer.EnsureCapacity(++languageLength);
+                error = MsiInterop.MsiGetFileVersion(filePath, versionBuffer, ref versionLength, languageBuffer, ref languageLength);
+            }
+            else if (1006 == error)
+            {
+                // file has no version or language, so no error
+                error = 0;
+            }
+
+            if (0 != error)
+            {
+                throw new MsiException(error);
+            }
+
+            version = versionBuffer.ToString();
+            language = languageBuffer.ToString();
+        }
+
+        /// <summary>
+        /// Enables an external user-interface handler.
+        /// </summary>
+        /// <param name="installUIHandler">Specifies a callback function.</param>
+        /// <param name="messageFilter">Specifies which messages to handle using the external message handler.</param>
+        /// <param name="context">Pointer to an application context that is passed to the callback function.</param>
+        /// <returns>The return value is the previously set external handler, or null if there was no previously set handler.</returns>
+        public static InstallUIHandler SetExternalUI(InstallUIHandler installUIHandler, int messageFilter, IntPtr context)
+        {
+            return MsiInterop.MsiSetExternalUI(installUIHandler, messageFilter, context);
+        }
+
+        /// <summary>
+        /// Enables the installer's internal user interface.
+        /// </summary>
+        /// <param name="uiLevel">Specifies the level of complexity of the user interface.</param>
+        /// <param name="hwnd">Pointer to a window. This window becomes the owner of any user interface created.</param>
+        /// <returns>The previous user interface level is returned. If an invalid dwUILevel is passed, then INSTALLUILEVEL_NOCHANGE is returned.</returns>
+        public static int SetInternalUI(int uiLevel, ref IntPtr hwnd)
+        {
+            return MsiInterop.MsiSetInternalUI(uiLevel, ref hwnd);
+        }
+    }
+}