feat: Add support for Windows Installer Patch (.msp) files

Closes #1

src/LessMsi.Cli/ListTableCommand.cs

@@ -31,7 +31,7 @@ public override void Run(List<string> args)
 
 			var csv = new StringBuilder();
 			Debug.Print("Opening msi file '{0}'.", extra[0]);
-			using (var msidb = new Database(extra[0], OpenDatabase.ReadOnly))
+			using (var msidb = MsiDatabase.Create(new LessIO.Path(extra[0])))
 			{
 				Debug.Print("Opening table '{0}'.", tableName);
 				var query = string.Format(CultureInfo.InvariantCulture, "SELECT * FROM `{0}`", tableName);

src/LessMsi.Core/LessMsi.Core.csproj

@@ -56,6 +56,7 @@
   <ItemGroup>
     <Compile Include="Msi\ColumnInfo.cs" />
     <Compile Include="Msi\ExternalCabNotFoundException.cs" />
+    <Compile Include="Msi\MsiDatabase.cs" />
     <Compile Include="Msi\MsiDirectory.cs" />
     <Compile Include="Msi\MsiFile.cs" />
     <Compile Include="Msi\TableWrapper.cs" />

src/LessMsi.Core/Msi/MsiDatabase.cs

@@ -0,0 +1,57 @@
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+// Copyright (c) 2021 Scott Willeke (http://scott.willeke.com)
+//
+// Authors:
+//	Scott Willeke (scott@willeke.com)
+//
+using Microsoft.Tools.WindowsInstallerXml.Msi;
+
+namespace LessMsi.Msi
+{
+	/// <summary>
+	/// Helper class for opening an MSI Database or MSI Patch file
+	/// </summary>
+	public static class MsiDatabase
+	{
+		/// <summary>
+		/// Documented flag, unlisted in Microsoft.Tools.WindowsInstallerXml.Msi.OpenDatabase
+		/// </summary>
+		const uint MSIDBOPEN_PATCHFILE = 32;
+
+		/// <summary>
+		/// Create a Database object from either an .msi or .mso file
+		/// </summary>
+		/// <param name="msiDatabaseFilePath">The path to the database or patch file</param>
+		/// <returns></returns>
+		public static Database Create(LessIO.Path msiDatabaseFilePath)
+		{
+			try
+			{
+				return new Database(msiDatabaseFilePath.PathString, OpenDatabase.ReadOnly);
+			}
+			catch (System.IO.IOException)
+			{
+				// retry as patchfile (.msp)
+				return new Database(msiDatabaseFilePath.PathString, OpenDatabase.ReadOnly | (OpenDatabase)MSIDBOPEN_PATCHFILE);
+			}
+		}
+	}
+}

src/LessMsi.Core/Msi/TableWrapper.cs

@@ -48,7 +48,7 @@ public static TableRow[] GetRowsFromTable(Database msidb, string tableName)
         {
             if (!msidb.TableExists(tableName))
             {
-                Trace.WriteLine(string.Format("Table name does {0} not exist Found.", tableName));
+                Trace.WriteLine(string.Format("Table name '{0}' does not exist.", tableName));
                 return new TableRow[0];
             }
 

src/LessMsi.Gui/MainForm.cs

@@ -48,6 +48,8 @@ internal class MainForm : Form, IMainFormView
 		private Panel pnlStreamsBottom;
 		private Button btnExtractStreamFiles;
 		private ToolStripMenuItem searchFileToolStripMenuItem;
+		readonly static string[] AllowedDragDropExtensions = new[] { ".msi", ".msp" };
+
 
 		public MainForm(string defaultInputFile)
 		{
@@ -671,7 +673,7 @@ private void InitializeComponent()
             // openMsiDialog
             // 
             this.openMsiDialog.DefaultExt = "msi";
-            this.openMsiDialog.Filter = "msierablefiles|*.msi|All Files|*.*";
+            this.openMsiDialog.Filter = "msierablefiles|*.msi;*.msp|All Files|*.*";
             // 
             // statusBar1
             // 
@@ -1016,7 +1018,7 @@ private static IEnumerable<string> GetDraggedFiles(DragEventArgs e)
 		{
 			var files = (string[]) e.Data.GetData(DataFormats.FileDrop);
 			var query = from file in files
-			            where file != null && Path.GetExtension(file).ToLowerInvariant() == ".msi"
+			            where file != null && AllowedDragDropExtensions.Contains(Path.GetExtension(file).ToLowerInvariant())
 			            select file;
 			return query;
 		}

src/LessMsi.Gui/MainFormPresenter.cs

@@ -98,7 +98,7 @@ public MainForm ViewLeakedAbstraction
 		/// </summary>
 		public void ViewFiles()
 		{
-			using (var msidb = new Database(this.SelectedMsiFile.FullName, OpenDatabase.ReadOnly))
+			using (var msidb = MsiDatabase.Create(new LessIO.Path(this.SelectedMsiFile.FullName)))
 			{
 				ViewFiles(msidb);
 				ToggleSelectAllFiles(true);
@@ -120,14 +120,23 @@ private void ViewFiles(Database msidb)
 				{
 					Status();
 
-					MsiFile[] dataItems = MsiFile.CreateMsiFilesFromMSI(msidb);
-					MsiFileItemView[] viewItems = Array.ConvertAll<MsiFile, MsiFileItemView>(dataItems,
-						inItem => new MsiFileItemView(inItem)
-						);
-					fileDataSource = new SortableBindingList<MsiFileItemView>(viewItems);
-					ViewLeakedAbstraction.fileGrid.DataSource = fileDataSource;
-					View.AutoSizeFileGridColumns();
-					Status(fileDataSource.Count + " files found.");
+					ViewLeakedAbstraction.fileGrid.DataSource = null;
+
+					if (msidb.TableExists("File"))
+					{
+						MsiFile[] dataItems = MsiFile.CreateMsiFilesFromMSI(msidb);
+						MsiFileItemView[] viewItems = Array.ConvertAll<MsiFile, MsiFileItemView>(dataItems,
+							inItem => new MsiFileItemView(inItem)
+							);
+						fileDataSource = new SortableBindingList<MsiFileItemView>(viewItems);
+						ViewLeakedAbstraction.fileGrid.DataSource = fileDataSource;
+						View.AutoSizeFileGridColumns();
+						Status(fileDataSource.Count + " files found.");
+					}
+					else
+					{
+						Status("No files present.");
+					}
 				}
 				catch (Exception eUnexpected)
 				{
@@ -144,7 +153,7 @@ public void UpdatePropertyTabView()
 			try
 			{
 				MsiPropertyInfo[] props;
-				using (var msidb = new Database(this.SelectedMsiFile.FullName, OpenDatabase.ReadOnly))
+				using (var msidb = MsiDatabase.Create(new LessIO.Path(this.SelectedMsiFile.FullName)))
 				{
 					props = MsiPropertyInfo.GetPropertiesFromDatabase(msidb);
 				}
@@ -315,7 +324,7 @@ public void LoadTables()
 
 			IEnumerable<string> msiTableNames = allTableNames;
 
-			using (var msidb = new Database(this.SelectedMsiFile.FullName, OpenDatabase.ReadOnly))
+			using (var msidb = MsiDatabase.Create(new LessIO.Path(this.SelectedMsiFile.FullName)))
 			{
 				using (View.StartWaitCursor())
 				{
@@ -407,7 +416,7 @@ public void OnSelectedStreamChanged()
 		/// </summary>
 		public void UpdateMSiTableGrid()
 		{
-			using (var msidb = new Database(this.SelectedMsiFile.FullName, OpenDatabase.ReadOnly))
+			using (var msidb = MsiDatabase.Create(new LessIO.Path(this.SelectedMsiFile.FullName)))
 			{
 				string tableName = View.SelectedTableName;
 				UpdateMSiTableGrid(msidb, tableName);

src/Lessmsi.Tests/LessMsi.Tests.csproj

@@ -53,6 +53,7 @@
     <Reference Include="System" />
     <Reference Include="System.Runtime.Serialization" />
     <Reference Include="System.XML" />
+    <Reference Include="WindowsBase" />
     <Reference Include="wix, Version=2.0.2110.0, Culture=neutral">
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\..\lib\wix.dll</HintPath>
@@ -83,6 +84,7 @@
     <Compile Include="FileEntryGraph.cs" />
     <Compile Include="MiscTests.cs" />
     <Compile Include="MiscTestsNUnit.cs" />
+    <Compile Include="MspTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="TestBase.cs" />
   </ItemGroup>

src/Lessmsi.Tests/MspTests.cs

@@ -0,0 +1,30 @@
+using Xunit;
+
+namespace LessMsi.Tests
+{
+	public class MspTests: TestBase
+	{
+		[Fact]
+		public void MsXml5()
+		{
+			ExpectTables("msxml5.msp", new[] { "MsiPatchMetadata", "MsiPatchSequence" });
+			// Cannot test properties yet, since they are internal in LessMsi.Gui!
+			ExpectStreamCabFiles("msxml5.msp", true);
+		}
+
+		[Fact]
+		public void WPF2_32()
+		{
+			ExpectTables("WPF2_32.msp", new[] { "MsiPatchMetadata", "MsiPatchSequence" });
+			ExpectStreamCabFiles("WPF2_32.msp", true);
+		}
+
+		[Fact]
+		public void SQL2008_AS()
+		{
+			ExpectTables("SQL2008_AS.msp", new[] { "MsiPatchSequence" });
+			ExpectStreamCabFiles("SQL2008_AS.msp", true);
+		}
+
+	}
+}

src/Lessmsi.Tests/TestBase.cs

@@ -4,7 +4,8 @@
 using System.Threading;
 using Xunit;
 using LessIO;
-
+using System.Linq;
+
 namespace LessMsi.Tests
 {
     public class TestBase
@@ -242,6 +243,45 @@ protected Path AppPath
                 var local = new Path(codeBase.LocalPath);
                 return local.Parent;
             }
-        }
-    }
-}
+        }
+
+		[DebuggerHidden]
+		protected void ExpectTables(string sourceFileName, string[] expectedTableNames)
+		{
+			using (var msidb = Msi.MsiDatabase.Create(GetMsiTestFile(sourceFileName)))
+			{
+				Assert.NotNull(msidb);
+				var query = "SELECT * FROM `_Tables`";
+				using (var msiTable = new Msi.ViewWrapper(msidb.OpenExecuteView(query)))
+				{
+					Assert.NotNull(msiTable);
+
+					var tableNames = from record in msiTable.Records
+									 select record[0] as string;
+					// Since we don't care about the order, we sort the lists
+					Assert.Equal(expectedTableNames.OrderBy(s => s), tableNames.OrderBy(s => s));
+				}
+			}
+		}
+
+		[DebuggerHidden]
+		protected void ExpectStreamCabFiles(string sourceFileName, bool hasCab)
+		{
+			using (var stg = new OleStorage.OleStorageFile(GetMsiTestFile(sourceFileName)))
+			{
+				var strm = stg.GetStreams().Where(elem => OleStorage.OleStorageFile.IsCabStream(elem));
+				if (strm != null)
+				{
+					// Rest of the CAB parsing logic is in the UI, can't extract filenames without duplicating code that we want to test..
+					Assert.True(hasCab);
+				}
+				else
+				{
+					// Not expecting to find a cab here
+					Assert.False(hasCab);
+				}
+			}
+		}
+
+	}
+}