Provide managed CA and Embedded UI DTF libraries via NuGet

Lots of refactoring to bring the SFX tooling back into the 'dtf'
layer since they are (in the end) tightly coupled to some DTF
assemblies. Also refactored the DTF tests into their own folder
and added a couple integration tests to build using the new CA/UI
NuGet package.

Closes wixtoolset/issues#6080

4 files changed, 747 insertions, 0 deletions

diff --git a/src/dtf/WixToolset.Dtf.MakeSfxCA/MakeSfxCA.cs b/src/dtf/WixToolset.Dtf.MakeSfxCA/MakeSfxCA.cs
new file mode 100644
index 00000000..d701da20
--- /dev/null
+++ b/src/dtf/WixToolset.Dtf.MakeSfxCA/MakeSfxCA.cs
@@ -0,0 +1,710 @@
+// 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.Dtf.MakeSfxCA
+{
+    using System;
+    using System.IO;
+    using System.Collections.Generic;
+    using System.Security;
+    using System.Text;
+    using System.Reflection;
+    using WixToolset.Dtf.Compression;
+    using WixToolset.Dtf.Compression.Cab;
+    using WixToolset.Dtf.Resources;
+    using ResourceCollection = WixToolset.Dtf.Resources.ResourceCollection;
+
+    /// <summary>
+    /// Command-line tool for building self-extracting custom action packages.
+    /// Appends cabbed CA binaries to SfxCA.dll and fixes up the result's
+    /// entry-points and file version to look like the CA module.
+    /// </summary>
+    public static class MakeSfxCA
+    {
+        private const string REQUIRED_WI_ASSEMBLY = "WixToolset.Dtf.WindowsInstaller.dll";
+
+        private static TextWriter log;
+
+        /// <summary>
+        /// Prints usage text for the tool.
+        /// </summary>
+        /// <param name="w">Console text writer.</param>
+        public static void Usage(TextWriter w)
+        {
+            w.WriteLine("WiX Toolset custom action packager version {0}", Assembly.GetExecutingAssembly().GetName().Version);
+            w.WriteLine("Copyright (C) .NET Foundation and contributors. All rights reserved.");
+            w.WriteLine();
+            w.WriteLine("Usage: WixToolset.Dtf.MakeSfxCA <outputca.dll> SfxCA.dll <inputca.dll> [support files ...]");
+            w.WriteLine();
+            w.WriteLine("Makes a self-extracting managed MSI CA or UI DLL package.");
+            w.WriteLine("Support files must include " + MakeSfxCA.REQUIRED_WI_ASSEMBLY);
+            w.WriteLine("Support files optionally include CustomAction.config/EmbeddedUI.config");
+        }
+
+        /// <summary>
+        /// Runs the MakeSfxCA command-line tool.
+        /// </summary>
+        /// <param name="args">Command-line arguments.</param>
+        /// <returns>0 on success, nonzero on failure.</returns>
+        public static int Main(string[] args)
+        {
+            if (args.Length < 3)
+            {
+                Usage(Console.Out);
+                return 1;
+            }
+
+            var output = args[0];
+            var sfxDll = args[1];
+            var inputs = new string[args.Length - 2];
+            Array.Copy(args, 2, inputs, 0, inputs.Length);
+
+            try
+            {
+                Build(output, sfxDll, inputs, Console.Out);
+                return 0;
+            }
+            catch (ArgumentException ex)
+            {
+                Console.Error.WriteLine("Error: Invalid argument: " + ex.Message);
+                return 1;
+            }
+            catch (FileNotFoundException ex)
+            {
+                Console.Error.WriteLine("Error: Cannot find file: " + ex.Message);
+                return 1;
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine("Error: Unexpected error: " + ex);
+                return 1;
+            }
+        }
+
+        /// <summary>
+        /// Packages up all the inputs to the output location.
+        /// </summary>
+        /// <exception cref="Exception">Various exceptions are thrown
+        /// if things go wrong.</exception>
+        public static void Build(string output, string sfxDll, IList<string> inputs, TextWriter log)
+        {
+            MakeSfxCA.log = log;
+
+            if (String.IsNullOrEmpty(output))
+            {
+                throw new ArgumentNullException("output");
+            }
+
+            if (String.IsNullOrEmpty(sfxDll))
+            {
+                throw new ArgumentNullException("sfxDll");
+            }
+
+            if (inputs == null || inputs.Count == 0)
+            {
+                throw new ArgumentNullException("inputs");
+            }
+
+            if (!File.Exists(sfxDll))
+            {
+                throw new FileNotFoundException(sfxDll);
+            }
+
+            var customActionAssembly = inputs[0];
+            if (!File.Exists(customActionAssembly))
+            {
+                throw new FileNotFoundException(customActionAssembly);
+            }
+
+            inputs = MakeSfxCA.SplitList(inputs);
+
+            var inputsMap = MakeSfxCA.GetPackFileMap(inputs);
+
+            var foundWIAssembly = false;
+            foreach (var input in inputsMap.Keys)
+            {
+                if (String.Compare(input, MakeSfxCA.REQUIRED_WI_ASSEMBLY,
+                    StringComparison.OrdinalIgnoreCase) == 0)
+                {
+                    foundWIAssembly = true;
+                }
+            }
+
+            if (!foundWIAssembly)
+            {
+                throw new ArgumentException(MakeSfxCA.REQUIRED_WI_ASSEMBLY +
+                    " must be included in the list of support files. " +
+                    "If using the MSBuild targets, make sure the assembly reference " +
+                    "has the Private (Copy Local) flag set.");
+            }
+
+            MakeSfxCA.ResolveDependentAssemblies(inputsMap, Path.GetDirectoryName(customActionAssembly));
+
+            var entryPoints = MakeSfxCA.FindEntryPoints(customActionAssembly);
+            var uiClass = MakeSfxCA.FindEmbeddedUIClass(customActionAssembly);
+
+            if (entryPoints.Count == 0 && uiClass == null)
+            {
+                throw new ArgumentException(
+                    "No CA or UI entry points found in module: " + customActionAssembly);
+            }
+            else if (entryPoints.Count > 0 && uiClass != null)
+            {
+                throw new NotSupportedException(
+                    "CA and UI entry points cannot be in the same assembly: " + customActionAssembly);
+            }
+
+            var dir = Path.GetDirectoryName(output);
+            if (dir.Length > 0 && !Directory.Exists(dir))
+            {
+                Directory.CreateDirectory(dir);
+            }
+
+            using (Stream outputStream = File.Create(output))
+            {
+                MakeSfxCA.WriteEntryModule(sfxDll, outputStream, entryPoints, uiClass);
+            }
+
+            MakeSfxCA.CopyVersionResource(customActionAssembly, output);
+
+            MakeSfxCA.PackInputFiles(output, inputsMap);
+
+            log.WriteLine("MakeSfxCA finished: " + new FileInfo(output).FullName);
+        }
+
+        /// <summary>
+        /// Splits any list items delimited by semicolons into separate items.
+        /// </summary>
+        /// <param name="list">Read-only input list.</param>
+        /// <returns>New list with resulting split items.</returns>
+        private static IList<string> SplitList(IList<string> list)
+        {
+            var newList = new List<string>(list.Count);
+
+            foreach (var item in list)
+            {
+                if (!String.IsNullOrEmpty(item))
+                {
+                    foreach (var splitItem in item.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries))
+                    {
+                        newList.Add(splitItem);
+                    }
+                }
+            }
+
+            return newList;
+        }
+
+        /// <summary>
+        /// Sets up a reflection-only assembly-resolve-handler to handle loading dependent assemblies during reflection.
+        /// </summary>
+        /// <param name="inputFiles">List of input files which include non-GAC dependent assemblies.</param>
+        /// <param name="inputDir">Directory to auto-locate additional dependent assemblies.</param>
+        /// <remarks>
+        /// Also searches the assembly's directory for unspecified dependent assemblies, and adds them
+        /// to the list of input files if found.
+        /// </remarks>
+        private static void ResolveDependentAssemblies(IDictionary<string, string> inputFiles, string inputDir)
+        {
+            AppDomain.CurrentDomain.ReflectionOnlyAssemblyResolve += delegate(object sender, ResolveEventArgs args)
+            {
+                AssemblyName resolveName = new AssemblyName(args.Name);
+                Assembly assembly = null;
+
+                // First, try to find the assembly in the list of input files.
+                foreach (var inputFile in inputFiles.Values)
+                {
+                    var inputName = Path.GetFileNameWithoutExtension(inputFile);
+                    var inputExtension = Path.GetExtension(inputFile);
+                    if (String.Equals(inputName, resolveName.Name, StringComparison.OrdinalIgnoreCase) &&
+                        (String.Equals(inputExtension, ".dll", StringComparison.OrdinalIgnoreCase) ||
+                         String.Equals(inputExtension, ".exe", StringComparison.OrdinalIgnoreCase)))
+                    {
+                        assembly = MakeSfxCA.TryLoadDependentAssembly(inputFile);
+
+                        if (assembly != null)
+                        {
+                            break;
+                        }
+                    }
+                }
+
+                // Second, try to find the assembly in the input directory.
+                if (assembly == null && inputDir != null)
+                {
+                    string assemblyPath = null;
+                    if (File.Exists(Path.Combine(inputDir, resolveName.Name) + ".dll"))
+                    {
+                        assemblyPath = Path.Combine(inputDir, resolveName.Name) + ".dll";
+                    }
+                    else if (File.Exists(Path.Combine(inputDir, resolveName.Name) + ".exe"))
+                    {
+                        assemblyPath = Path.Combine(inputDir, resolveName.Name) + ".exe";
+                    }
+
+                    if (assemblyPath != null)
+                    {
+                        assembly = MakeSfxCA.TryLoadDependentAssembly(assemblyPath);
+
+                        if (assembly != null)
+                        {
+                            // Add this detected dependency to the list of files to be packed.
+                            inputFiles.Add(Path.GetFileName(assemblyPath), assemblyPath);
+                        }
+                    }
+                }
+
+                // Third, try to load the assembly from the GAC.
+                if (assembly == null)
+                {
+                    try
+                    {
+                        assembly = Assembly.ReflectionOnlyLoad(args.Name);
+                    }
+                    catch (FileNotFoundException)
+                    {
+                    }
+                }
+
+                if (assembly != null)
+                {
+                    if (String.Equals(assembly.GetName().ToString(), resolveName.ToString()))
+                    {
+                        log.WriteLine("    Loaded dependent assembly: " + assembly.Location);
+                        return assembly;
+                    }
+
+                    log.WriteLine("    Warning: Loaded mismatched dependent assembly: " + assembly.Location);
+                    log.WriteLine("      Loaded assembly   : " + assembly.GetName());
+                    log.WriteLine("      Reference assembly: " + resolveName);
+                }
+                else
+                {
+                    log.WriteLine("    Error: Dependent assembly not supplied: " + resolveName);
+                }
+
+                return null;
+            };
+        }
+
+        /// <summary>
+        /// Attempts a reflection-only load of a dependent assembly, logging the error if the load fails.
+        /// </summary>
+        /// <param name="assemblyPath">Path of the assembly file to laod.</param>
+        /// <returns>Loaded assembly, or null if the load failed.</returns>
+        private static Assembly TryLoadDependentAssembly(string assemblyPath)
+        {
+            Assembly assembly = null;
+            try
+            {
+                assembly = Assembly.ReflectionOnlyLoadFrom(assemblyPath);
+            }
+            catch (IOException ex)
+            {
+                log.WriteLine("    Error: Failed to load dependent assembly: {0}. {1}", assemblyPath, ex.Message);
+            }
+            catch (BadImageFormatException ex)
+            {
+                log.WriteLine("    Error: Failed to load dependent assembly: {0}. {1}", assemblyPath, ex.Message);
+            }
+            catch (SecurityException ex)
+            {
+                log.WriteLine("    Error: Failed to load dependent assembly: {0}. {1}", assemblyPath, ex.Message);
+            }
+
+            return assembly;
+        }
+
+        /// <summary>
+        /// Searches the types in the input assembly for a type that implements IEmbeddedUI.
+        /// </summary>
+        /// <param name="module"></param>
+        /// <returns></returns>
+        private static string FindEmbeddedUIClass(string module)
+        {
+            log.WriteLine("Searching for an embedded UI class in {0}", Path.GetFileName(module));
+
+            string uiClass = null;
+
+            var assembly = Assembly.ReflectionOnlyLoadFrom(module);
+
+            foreach (var type in assembly.GetExportedTypes())
+            {
+                if (!type.IsAbstract)
+                {
+                    foreach (var interfaceType in type.GetInterfaces())
+                    {
+                        if (interfaceType.FullName == "WixToolset.Dtf.WindowsInstaller.IEmbeddedUI")
+                        {
+                            if (uiClass == null)
+                            {
+                                uiClass = assembly.GetName().Name + "!" + type.FullName;
+                            }
+                            else
+                            {
+                                throw new ArgumentException("Multiple IEmbeddedUI implementations found.");
+                            }
+                        }
+                    }
+                }
+            }
+
+            return uiClass;
+        }
+
+        /// <summary>
+        /// Reflects on an input CA module to locate custom action entry-points.
+        /// </summary>
+        /// <param name="module">Assembly module with CA entry-points.</param>
+        /// <returns>Mapping from entry-point names to assembly!class.method paths.</returns>
+        private static IDictionary<string, string> FindEntryPoints(string module)
+        {
+            log.WriteLine("Searching for custom action entry points " +
+                "in {0}", Path.GetFileName(module));
+
+            var entryPoints = new Dictionary<string, string>();
+
+            var assembly = Assembly.ReflectionOnlyLoadFrom(module);
+
+            foreach (var type in assembly.GetExportedTypes())
+            {
+                foreach (var method in type.GetMethods(BindingFlags.Public | BindingFlags.Static))
+                {
+                    var entryPointName = MakeSfxCA.GetEntryPoint(method);
+                    if (entryPointName != null)
+                    {
+                        var entryPointPath = String.Format(
+                            "{0}!{1}.{2}",
+                            Path.GetFileNameWithoutExtension(module),
+                            type.FullName,
+                            method.Name);
+                        entryPoints.Add(entryPointName, entryPointPath);
+
+                        log.WriteLine("    {0}={1}", entryPointName, entryPointPath);
+                    }
+                }
+            }
+
+            return entryPoints;
+        }
+
+        /// <summary>
+        /// Check for a CustomActionAttribute and return the entrypoint name for the method if it is a CA method.
+        /// </summary>
+        /// <param name="method">A public static method.</param>
+        /// <returns>Entrypoint name for the method as specified by the custom action attribute or just the method name,
+        /// or null if the method is not a custom action method.</returns>
+        private static string GetEntryPoint(MethodInfo method)
+        {
+            IList<CustomAttributeData> attributes;
+            try
+            {
+                attributes = CustomAttributeData.GetCustomAttributes(method);
+            }
+            catch (FileLoadException)
+            {
+                // Already logged load failures in the assembly-resolve-handler.
+                return null;
+            }
+
+            foreach (CustomAttributeData attribute in attributes)
+            {
+                if (attribute.ToString().StartsWith(
+                    "[WixToolset.Dtf.WindowsInstaller.CustomActionAttribute(",
+                    StringComparison.Ordinal))
+                {
+                    string entryPointName = null;
+                    foreach (var argument in attribute.ConstructorArguments)
+                    {
+                        // The entry point name is the first positional argument, if specified.
+                        entryPointName = (string) argument.Value;
+                        break;
+                    }
+
+                    if (String.IsNullOrEmpty(entryPointName))
+                    {
+                        entryPointName = method.Name;
+                    }
+
+                    return entryPointName;
+                }
+            }
+
+            return null;
+        }
+
+        /// <summary>
+        /// Counts the number of template entrypoints in SfxCA.dll.
+        /// </summary>
+        /// <remarks>
+        /// Depending on the requirements, SfxCA.dll might be built with
+        /// more entrypoints than the default.
+        /// </remarks>
+        private static int GetEntryPointSlotCount(byte[] fileBytes, string entryPointFormat)
+        {
+            for (var count = 0; ; count++)
+            {
+                var templateName = String.Format(entryPointFormat, count);
+                var templateAsciiBytes = Encoding.ASCII.GetBytes(templateName);
+
+                var nameOffset = FindBytes(fileBytes, templateAsciiBytes);
+                if (nameOffset < 0)
+                {
+                    return count;
+                }
+            }
+        }
+
+        /// <summary>
+        /// Writes a modified version of SfxCA.dll to the output stream,
+        /// with the template entry-points mapped to the CA entry-points.
+        /// </summary>
+        /// <remarks>
+        /// To avoid having to recompile SfxCA.dll for every different set of CAs,
+        /// this method looks for a preset number of template entry-points in the
+        /// binary file and overwrites their entrypoint name and string data with
+        /// CA-specific values.
+        /// </remarks>
+        private static void WriteEntryModule(
+            string sfxDll, Stream outputStream, IDictionary<string, string> entryPoints, string uiClass)
+        {
+            log.WriteLine("Modifying SfxCA.dll stub");
+
+            byte[] fileBytes;
+            using (var readStream = File.OpenRead(sfxDll))
+            {
+                fileBytes = new byte[(int) readStream.Length];
+                readStream.Read(fileBytes, 0, fileBytes.Length);
+            }
+
+            const string ENTRYPOINT_FORMAT = "CustomActionEntryPoint{0:d03}";
+            const int MAX_ENTRYPOINT_NAME = 72;
+            const int MAX_ENTRYPOINT_PATH = 160;
+            //var emptyBytes = new byte[0];
+
+            var slotCount = MakeSfxCA.GetEntryPointSlotCount(fileBytes, ENTRYPOINT_FORMAT);
+
+            if (slotCount == 0)
+            {
+                throw new ArgumentException("Invalid SfxCA.dll file.");
+            }
+
+            if (entryPoints.Count > slotCount)
+            {
+                throw new ArgumentException(String.Format(
+                    "The custom action assembly has {0} entrypoints, which is more than the maximum ({1}). " +
+                    "Refactor the custom actions or add more entrypoint slots in SfxCA\\EntryPoints.h.",
+                    entryPoints.Count, slotCount));
+            }
+
+            var slotSort = new string[slotCount];
+            for (var i = 0; i < slotCount - entryPoints.Count; i++)
+            {
+                slotSort[i] = String.Empty;
+            }
+
+            entryPoints.Keys.CopyTo(slotSort, slotCount - entryPoints.Count);
+            Array.Sort<string>(slotSort, slotCount - entryPoints.Count, entryPoints.Count, StringComparer.Ordinal);
+
+            for (var i = 0; ; i++)
+            {
+                var templateName = String.Format(ENTRYPOINT_FORMAT, i);
+                var templateAsciiBytes = Encoding.ASCII.GetBytes(templateName);
+                var templateUniBytes = Encoding.Unicode.GetBytes(templateName);
+
+                var nameOffset = MakeSfxCA.FindBytes(fileBytes, templateAsciiBytes);
+                if (nameOffset < 0)
+                {
+                    break;
+                }
+
+                var pathOffset = MakeSfxCA.FindBytes(fileBytes, templateUniBytes);
+                if (pathOffset < 0)
+                {
+                    break;
+                }
+
+                var entryPointName = slotSort[i];
+                var entryPointPath = entryPointName.Length > 0 ?
+                    entryPoints[entryPointName] : String.Empty;
+
+                if (entryPointName.Length > MAX_ENTRYPOINT_NAME)
+                {
+                    throw new ArgumentException(String.Format(
+                        "Entry point name exceeds limit of {0} characters: {1}",
+                        MAX_ENTRYPOINT_NAME,
+                        entryPointName));
+                }
+
+                if (entryPointPath.Length > MAX_ENTRYPOINT_PATH)
+                {
+                    throw new ArgumentException(String.Format(
+                        "Entry point path exceeds limit of {0} characters: {1}",
+                        MAX_ENTRYPOINT_PATH,
+                        entryPointPath));
+                }
+
+                var replaceNameBytes = Encoding.ASCII.GetBytes(entryPointName);
+                var replacePathBytes = Encoding.Unicode.GetBytes(entryPointPath);
+
+                MakeSfxCA.ReplaceBytes(fileBytes, nameOffset, MAX_ENTRYPOINT_NAME, replaceNameBytes);
+                MakeSfxCA.ReplaceBytes(fileBytes, pathOffset, MAX_ENTRYPOINT_PATH * 2, replacePathBytes);
+            }
+
+            if (entryPoints.Count == 0 && uiClass != null)
+            {
+                // Remove the zzz prefix from exported EmbeddedUI entry-points.
+                foreach (var export in new string[] { "InitializeEmbeddedUI", "EmbeddedUIHandler", "ShutdownEmbeddedUI" })
+                {
+                    var exportNameBytes = Encoding.ASCII.GetBytes("zzz" + export);
+
+                    var exportOffset = MakeSfxCA.FindBytes(fileBytes, exportNameBytes);
+                    if (exportOffset < 0)
+                    {
+                        throw new ArgumentException("Input SfxCA.dll does not contain exported entry-point: " + export);
+                    }
+
+                    var replaceNameBytes = Encoding.ASCII.GetBytes(export);
+                    MakeSfxCA.ReplaceBytes(fileBytes, exportOffset, exportNameBytes.Length, replaceNameBytes);
+                }
+
+                if (uiClass.Length > MAX_ENTRYPOINT_PATH)
+                {
+                    throw new ArgumentException(String.Format(
+                        "UI class full name exceeds limit of {0} characters: {1}",
+                        MAX_ENTRYPOINT_PATH,
+                        uiClass));
+                }
+
+                var templateBytes = Encoding.Unicode.GetBytes("InitializeEmbeddedUI_FullClassName");
+                var replaceBytes = Encoding.Unicode.GetBytes(uiClass);
+
+                // Fill in the embedded UI implementor class so the proxy knows which one to load.
+                var replaceOffset = MakeSfxCA.FindBytes(fileBytes, templateBytes);
+                if (replaceOffset >= 0)
+                {
+                    MakeSfxCA.ReplaceBytes(fileBytes, replaceOffset, MAX_ENTRYPOINT_PATH * 2, replaceBytes);
+                }
+            }
+
+            outputStream.Write(fileBytes, 0, fileBytes.Length);
+        }
+
+        /// <summary>
+        /// Searches for a sub-array of bytes within a larger array of bytes.
+        /// </summary>
+        private static int FindBytes(byte[] source, byte[] find)
+        {
+            for (var i = 0; i < source.Length; i++)
+            {
+                int j;
+                for (j = 0; j < find.Length; j++)
+                {
+                    if (source[i + j] != find[j])
+                    {
+                        break;
+                    }
+                }
+
+                if (j == find.Length)
+                {
+                    return i;
+                }
+            }
+
+            return -1;
+        }
+
+        /// <summary>
+        /// Replaces a range of bytes with new bytes, padding any extra part
+        /// of the range with zeroes.
+        /// </summary>
+        private static void ReplaceBytes(
+            byte[] source, int offset, int length, byte[] replace)
+        {
+            for (var i = 0; i < length; i++)
+            {
+                if (i < replace.Length)
+                {
+                    source[offset + i] = replace[i];
+                }
+                else
+                {
+                    source[offset + i] = 0;
+                }
+            }
+        }
+
+        /// <summary>
+        /// Print the name of one file as it is being packed into the cab.
+        /// </summary>
+        private static void PackProgress(object source, ArchiveProgressEventArgs e)
+        {
+            if (e.ProgressType == ArchiveProgressType.StartFile && log != null)
+            {
+                log.WriteLine("    {0}", e.CurrentFileName);
+            }
+        }
+
+        /// <summary>
+        /// Gets a mapping from filenames as they will be in the cab to filenames
+        /// as they are currently on disk.
+        /// </summary>
+        /// <remarks>
+        /// By default, all files will be placed in the root of the cab. But inputs may
+        /// optionally include an alternate inside-cab file path before an equals sign.
+        /// </remarks>
+        private static IDictionary<string, string> GetPackFileMap(IList<string> inputs)
+        {
+            var fileMap = new Dictionary<string, string>();
+            foreach (var inputFile in inputs)
+            {
+                if (inputFile.IndexOf('=') > 0)
+                {
+                    var parse = inputFile.Split('=');
+                    if (!fileMap.ContainsKey(parse[0]))
+                    {
+                        fileMap.Add(parse[0], parse[1]);
+                    }
+                }
+                else
+                {
+                    var fileName = Path.GetFileName(inputFile);
+                    if (!fileMap.ContainsKey(fileName))
+                    {
+                        fileMap.Add(fileName, inputFile);
+                    }
+                }
+            }
+            return fileMap;
+        }
+
+        /// <summary>
+        /// Packs the input files into a cab that is appended to the
+        /// output SfxCA.dll.
+        /// </summary>
+        private static void PackInputFiles(string outputFile, IDictionary<string, string> fileMap)
+        {
+            log.WriteLine("Packaging files");
+
+            var cabInfo = new CabInfo(outputFile);
+            cabInfo.PackFileSet(null, fileMap, CompressionLevel.Max, PackProgress);
+        }
+
+        /// <summary>
+        /// Copies the version resource information from the CA module to
+        /// the CA package. This gives the package the file version and
+        /// description of the CA module, instead of the version and
+        /// description of SfxCA.dll.
+        /// </summary>
+        private static void CopyVersionResource(string sourceFile, string destFile)
+        {
+            log.WriteLine("Copying file version info from {0} to {1}",
+                sourceFile, destFile);
+
+            var rc = new ResourceCollection();
+            rc.Find(sourceFile, ResourceType.Version);
+            rc.Load(sourceFile);
+            rc.Save(destFile);
+        }
+    }
+}
diff --git a/src/dtf/WixToolset.Dtf.MakeSfxCA/MakeSfxCA.exe.manifest b/src/dtf/WixToolset.Dtf.MakeSfxCA/MakeSfxCA.exe.manifest
new file mode 100644
index 00000000..5224db50
--- /dev/null
+++ b/src/dtf/WixToolset.Dtf.MakeSfxCA/MakeSfxCA.exe.manifest
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+ <assemblyIdentity name="WixToolset.Dtf.MakeSfxCA" version="4.0.0.0" processorArchitecture="x86" type="win32"/>
+ <description>WiX Toolset Compiler</description> 
+ <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
+  <security><requestedPrivileges><requestedExecutionLevel level="asInvoker" uiAccess="false"/></requestedPrivileges></security>
+ </trustInfo>
+ <application xmlns="urn:schemas-microsoft-com:asm.v3">
+  <windowsSettings xmlns:ws2="http://schemas.microsoft.com/SMI/2016/WindowsSettings"><ws2:longPathAware>true</ws2:longPathAware></windowsSettings>
+ </application>
+</assembly>
diff --git a/src/dtf/WixToolset.Dtf.MakeSfxCA/WixToolset.Dtf.MakeSfxCA.csproj b/src/dtf/WixToolset.Dtf.MakeSfxCA/WixToolset.Dtf.MakeSfxCA.csproj
new file mode 100644
index 00000000..e62aaed3
--- /dev/null
+++ b/src/dtf/WixToolset.Dtf.MakeSfxCA/WixToolset.Dtf.MakeSfxCA.csproj
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 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. -->
+
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>net472</TargetFrameworks>
+    <IsPackable>false</IsPackable>
+    <DebugType>embedded</DebugType>
+    <AppConfig>app.config</AppConfig>
+    <ApplicationManifest>MakeSfxCA.exe.manifest</ApplicationManifest>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\WixToolset.Dtf.Compression.Cab\WixToolset.Dtf.Compression.Cab.csproj" />
+    <ProjectReference Include="..\WixToolset.Dtf.Compression\WixToolset.Dtf.Compression.csproj" />
+    <ProjectReference Include="..\WixToolset.Dtf.Resources\WixToolset.Dtf.Resources.csproj" />
+  </ItemGroup>
+</Project>
diff --git a/src/dtf/WixToolset.Dtf.MakeSfxCA/app.config b/src/dtf/WixToolset.Dtf.MakeSfxCA/app.config
new file mode 100644
index 00000000..29bbc006
--- /dev/null
+++ b/src/dtf/WixToolset.Dtf.MakeSfxCA/app.config
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <runtime>
+    <loadFromRemoteSources enabled="true"/>
+    <AppContextSwitchOverrides value="Switch.System.IO.UseLegacyPathHandling=false;Switch.System.IO.BlockLongPaths=false" />
+  </runtime>
+</configuration>