1 files changed, 516 insertions, 0 deletions

diff --git a/src/WixToolset.Mba.Core/Engine.cs b/src/WixToolset.Mba.Core/Engine.cs
new file mode 100644
index 00000000..ad62134f
--- /dev/null
+++ b/src/WixToolset.Mba.Core/Engine.cs
@@ -0,0 +1,516 @@
+// 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.BootstrapperCore
+{
+    using System;
+    using System.ComponentModel;
+    using System.Runtime.InteropServices;
+    using System.Security;
+    using System.Text;
+
+    /// <summary>
+    /// Container class for the <see cref="IBootstrapperEngine"/> interface.
+    /// </summary>
+    public sealed class Engine : IEngine
+    {
+        // Burn errs on empty strings, so declare initial buffer size.
+        private const int InitialBufferSize = 80;
+        private static readonly string normalizeVersionFormatString = "{0} must be less than or equal to " + UInt16.MaxValue;
+
+        private IBootstrapperEngine engine;
+        private Variables<long> numericVariables;
+        private Variables<SecureString> secureStringVariables;
+        private Variables<string> stringVariables;
+        private Variables<Version> versionVariables;
+
+        /// <summary>
+        /// Creates a new instance of the <see cref="Engine"/> container class.
+        /// </summary>
+        /// <param name="engine">The <see cref="IBootstrapperEngine"/> to contain.</param>
+        internal Engine(IBootstrapperEngine engine)
+        {
+            this.engine = engine;
+
+            // Wrap the calls to get and set numeric variables.
+            this.numericVariables = new Variables<long>(
+                delegate(string name)
+                {
+                    long value;
+                    int ret = this.engine.GetVariableNumeric(name, out value);
+                    if (NativeMethods.S_OK != ret)
+                    {
+                        throw new Win32Exception(ret);
+                    }
+
+                    return value;
+                },
+                delegate(string name, long value)
+                {
+                    this.engine.SetVariableNumeric(name, value);
+                },
+                delegate(string name)
+                {
+                    long value;
+                    int ret = this.engine.GetVariableNumeric(name, out value);
+
+                    return NativeMethods.E_NOTFOUND != ret;
+                }
+            );
+
+            // Wrap the calls to get and set string variables using SecureStrings.
+            this.secureStringVariables = new Variables<SecureString>(
+                delegate(string name)
+                {
+                    var pUniString = this.getStringVariable(name, out var length);
+                    try
+                    {
+                        return this.convertToSecureString(pUniString, length);
+                    }
+                    finally
+                    {
+                        if (IntPtr.Zero != pUniString)
+                        {
+                            Marshal.FreeCoTaskMem(pUniString);
+                        }
+                    }
+                },
+                delegate(string name, SecureString value)
+                {
+                    IntPtr pValue = Marshal.SecureStringToCoTaskMemUnicode(value);
+                    try
+                    {
+                        this.engine.SetVariableString(name, pValue);
+                    }
+                    finally
+                    {
+                        Marshal.FreeCoTaskMem(pValue);
+                    }
+                },
+                delegate(string name)
+                {
+                    return this.containsVariable(name);
+                }
+            );
+
+            // Wrap the calls to get and set string variables.
+            this.stringVariables = new Variables<string>(
+                delegate(string name)
+                {
+                    int length;
+                    IntPtr pUniString = this.getStringVariable(name, out length);
+                    try
+                    {
+                        return Marshal.PtrToStringUni(pUniString, length);
+                    }
+                    finally
+                    {
+                        if (IntPtr.Zero != pUniString)
+                        {
+                            Marshal.FreeCoTaskMem(pUniString);
+                        }
+                    }
+                },
+                delegate(string name, string value)
+                {
+                    IntPtr pValue = Marshal.StringToCoTaskMemUni(value);
+                    try
+                    {
+                        this.engine.SetVariableString(name, pValue);
+                    }
+                    finally
+                    {
+                        Marshal.FreeCoTaskMem(pValue);
+                    }
+                },
+                delegate(string name)
+                {
+                    return this.containsVariable(name);
+                }
+            );
+
+            // Wrap the calls to get and set version variables.
+            this.versionVariables = new Variables<Version>(
+                delegate(string name)
+                {
+                    long value;
+                    int ret = this.engine.GetVariableVersion(name, out value);
+                    if (NativeMethods.S_OK != ret)
+                    {
+                        throw new Win32Exception(ret);
+                    }
+
+                    return LongToVersion(value);
+                },
+                delegate(string name, Version value)
+                {
+                    long version = VersionToLong(value);
+                    this.engine.SetVariableVersion(name, version);
+                },
+                delegate(string name)
+                {
+                    long value;
+                    int ret = this.engine.GetVariableVersion(name, out value);
+
+                    return NativeMethods.E_NOTFOUND != ret;
+                }
+            );
+        }
+
+        public IVariables<long> NumericVariables
+        {
+            get { return this.numericVariables; }
+        }
+
+        public int PackageCount
+        {
+            get
+            {
+                int count;
+                this.engine.GetPackageCount(out count);
+
+                return count;
+            }
+        }
+
+        public IVariables<SecureString> SecureStringVariables
+        {
+            get { return this.secureStringVariables; }
+        }
+
+        public IVariables<string> StringVariables
+        {
+            get { return this.stringVariables; }
+        }
+
+        public IVariables<Version> VersionVariables
+        {
+            get { return this.versionVariables; }
+        }
+
+        public void Apply(IntPtr hwndParent)
+        {
+            this.engine.Apply(hwndParent);
+        }
+
+        public void CloseSplashScreen()
+        {
+            this.engine.CloseSplashScreen();
+        }
+
+        public void Detect()
+        {
+            this.Detect(IntPtr.Zero);
+        }
+
+        public void Detect(IntPtr hwndParent)
+        {
+            this.engine.Detect(hwndParent);
+        }
+
+        public bool Elevate(IntPtr hwndParent)
+        {
+            int ret = this.engine.Elevate(hwndParent);
+
+            if (NativeMethods.S_OK == ret || NativeMethods.E_ALREADYINITIALIZED == ret)
+            {
+                return true;
+            }
+            else if (NativeMethods.E_CANCELLED == ret)
+            {
+                return false;
+            }
+            else
+            {
+                throw new Win32Exception(ret);
+            }
+        }
+
+        public string EscapeString(string input)
+        {
+            int capacity = InitialBufferSize;
+            StringBuilder sb = new StringBuilder(capacity);
+
+            // Get the size of the buffer.
+            int ret = this.engine.EscapeString(input, sb, ref capacity);
+            if (NativeMethods.E_INSUFFICIENT_BUFFER == ret || NativeMethods.E_MOREDATA == ret)
+            {
+                sb.Capacity = ++capacity; // Add one for the null terminator.
+                ret = this.engine.EscapeString(input, sb, ref capacity);
+            }
+
+            if (NativeMethods.S_OK != ret)
+            {
+                throw new Win32Exception(ret);
+            }
+
+            return sb.ToString();
+        }
+
+        public bool EvaluateCondition(string condition)
+        {
+            bool value;
+            this.engine.EvaluateCondition(condition, out value);
+
+            return value;
+        }
+
+        public string FormatString(string format)
+        {
+            int capacity = InitialBufferSize;
+            StringBuilder sb = new StringBuilder(capacity);
+
+            // Get the size of the buffer.
+            int ret = this.engine.FormatString(format, sb, ref capacity);
+            if (NativeMethods.E_INSUFFICIENT_BUFFER == ret || NativeMethods.E_MOREDATA == ret)
+            {
+                sb.Capacity = ++capacity; // Add one for the null terminator.
+                ret = this.engine.FormatString(format, sb, ref capacity);
+            }
+
+            if (NativeMethods.S_OK != ret)
+            {
+                throw new Win32Exception(ret);
+            }
+
+            return sb.ToString();
+        }
+
+        public void LaunchApprovedExe(IntPtr hwndParent, string approvedExeForElevationId, string arguments)
+        {
+            this.LaunchApprovedExe(hwndParent, approvedExeForElevationId, arguments, 0);
+        }
+
+        public void LaunchApprovedExe(IntPtr hwndParent, string approvedExeForElevationId, string arguments, int waitForInputIdleTimeout)
+        {
+            this.engine.LaunchApprovedExe(hwndParent, approvedExeForElevationId, arguments, waitForInputIdleTimeout);
+        }
+
+        public void Log(LogLevel level, string message)
+        {
+            this.engine.Log(level, message);
+        }
+
+        public void Plan(LaunchAction action)
+        {
+            this.engine.Plan(action);
+        }
+
+        public void SetUpdate(string localSource, string downloadSource, long size, UpdateHashType hashType, byte[] hash)
+        {
+            this.engine.SetUpdate(localSource, downloadSource, size, hashType, hash, null == hash ? 0 : hash.Length);
+        }
+
+        public void SetLocalSource(string packageOrContainerId, string payloadId, string path)
+        {
+            this.engine.SetLocalSource(packageOrContainerId, payloadId, path);
+        }
+
+        public void SetDownloadSource(string packageOrContainerId, string payloadId, string url, string user, string password)
+        {
+            this.engine.SetDownloadSource(packageOrContainerId, payloadId, url, user, password);
+        }
+
+        public int SendEmbeddedError(int errorCode, string message, int uiHint)
+        {
+            int result = 0;
+            this.engine.SendEmbeddedError(errorCode, message, uiHint, out result);
+            return result;
+        }
+
+        public int SendEmbeddedProgress(int progressPercentage, int overallPercentage)
+        {
+            int result = 0;
+            this.engine.SendEmbeddedProgress(progressPercentage, overallPercentage, out result);
+            return result;
+        }
+
+        public void Quit(int exitCode)
+        {
+            this.engine.Quit(exitCode);
+        }
+
+        internal sealed class Variables<T> : IVariables<T>
+        {
+            // .NET 2.0 does not support Func<T, TResult> or Action<T1, T2>.
+            internal delegate T Getter<T>(string name);
+            internal delegate void Setter<T>(string name, T value);
+
+            private Getter<T> getter;
+            private Setter<T> setter;
+            private Predicate<string> contains;
+
+            internal Variables(Getter<T> getter, Setter<T> setter, Predicate<string> contains)
+            {
+                this.getter = getter;
+                this.setter = setter;
+                this.contains = contains;
+            }
+
+            public T this[string name]
+            {
+                get { return this.getter(name); }
+                set { this.setter(name, value); }
+            }
+
+            public bool Contains(string name)
+            {
+                return this.contains(name);
+            }
+        }
+
+        /// <summary>
+        /// Gets whether the variable given by <paramref name="name"/> exists.
+        /// </summary>
+        /// <param name="name">The name of the variable to check.</param>
+        /// <returns>True if the variable given by <paramref name="name"/> exists; otherwise, false.</returns>
+        internal bool containsVariable(string name)
+        {
+            int capacity = 0;
+            IntPtr pValue = IntPtr.Zero;
+            int ret = this.engine.GetVariableString(name, pValue, ref capacity);
+
+            return NativeMethods.E_NOTFOUND != ret;
+        }
+
+        /// <summary>
+        /// Gets the variable given by <paramref name="name"/> as a string.
+        /// </summary>
+        /// <param name="name">The name of the variable to get.</param>
+        /// <param name="length">The length of the Unicode string.</param>
+        /// <returns>The value by a pointer to a Unicode string.  Must be freed by Marshal.FreeCoTaskMem.</returns>
+        /// <exception cref="Exception">An error occurred getting the variable.</exception>
+        internal IntPtr getStringVariable(string name, out int length)
+        {
+            int capacity = InitialBufferSize;
+            bool success = false;
+            IntPtr pValue = Marshal.AllocCoTaskMem(capacity * UnicodeEncoding.CharSize);
+            try
+            {
+                // Get the size of the buffer.
+                int ret = this.engine.GetVariableString(name, pValue, ref capacity);
+                if (NativeMethods.E_INSUFFICIENT_BUFFER == ret || NativeMethods.E_MOREDATA == ret)
+                {
+                    // Don't need to add 1 for the null terminator, the engine already includes that.
+                    pValue = Marshal.ReAllocCoTaskMem(pValue, capacity * UnicodeEncoding.CharSize);
+                    ret = this.engine.GetVariableString(name, pValue, ref capacity);
+                }
+
+                if (NativeMethods.S_OK != ret)
+                {
+                    throw Marshal.GetExceptionForHR(ret);
+                }
+
+                // The engine only returns the exact length of the string if the buffer was too small, so calculate it ourselves.
+                for (length = 0; length < capacity; ++length)
+                {
+                    if(0 == Marshal.ReadInt16(pValue, length * UnicodeEncoding.CharSize))
+                    {
+                        break;
+                    }
+                }
+
+                success = true;
+                return pValue;
+            }
+            finally
+            {
+                if (!success && IntPtr.Zero != pValue)
+                {
+                    Marshal.FreeCoTaskMem(pValue);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Initialize a SecureString with the given Unicode string.
+        /// </summary>
+        /// <param name="pUniString">Pointer to Unicode string.</param>
+        /// <param name="length">The string's length.</param>
+        internal SecureString convertToSecureString(IntPtr pUniString, int length)
+        {
+            if (IntPtr.Zero == pUniString)
+            {
+                return null;
+            }
+
+            SecureString value = new SecureString();
+            short s;
+            char c;
+            for (int charIndex = 0; charIndex < length; charIndex++)
+            {
+                s = Marshal.ReadInt16(pUniString, charIndex * UnicodeEncoding.CharSize);
+                c = (char)s;
+                value.AppendChar(c);
+                s = 0;
+                c = (char)0;
+            }
+            return value;
+        }
+
+        public static long VersionToLong(Version version)
+        {
+            // In Windows, each version component has a max value of 65535,
+            // so we truncate the version before shifting it, which will overflow if invalid.
+            long major = (long)(ushort)version.Major << 48;
+            long minor = (long)(ushort)version.Minor << 32;
+            long build = (long)(ushort)version.Build << 16;
+            long revision = (long)(ushort)version.Revision;
+
+            return major | minor | build | revision;
+        }
+
+        public static Version LongToVersion(long version)
+        {
+            int major = (int)((version & ((long)0xffff << 48)) >> 48);
+            int minor = (int)((version & ((long)0xffff << 32)) >> 32);
+            int build = (int)((version & ((long)0xffff << 16)) >> 16);
+            int revision = (int)(version & 0xffff);
+
+            return new Version(major, minor, build, revision);
+        }
+
+        /// <summary>
+        /// Verifies that VersionVariables can pass on the given Version to the engine.
+        /// If the Build or Revision fields are undefined, they are set to zero.
+        /// </summary>
+        public static Version NormalizeVersion(Version version)
+        {
+            if (version == null)
+            {
+                throw new ArgumentNullException("version");
+            }
+
+            int major = version.Major;
+            int minor = version.Minor;
+            int build = version.Build;
+            int revision = version.Revision;
+
+            if (major > UInt16.MaxValue)
+            {
+                throw new ArgumentOutOfRangeException("version", String.Format(normalizeVersionFormatString, "Major"));
+            }
+            if (minor > UInt16.MaxValue)
+            {
+                throw new ArgumentOutOfRangeException("version", String.Format(normalizeVersionFormatString, "Minor"));
+            }
+            if (build > UInt16.MaxValue)
+            {
+                throw new ArgumentOutOfRangeException("version", String.Format(normalizeVersionFormatString, "Build"));
+            }
+            if (build == -1)
+            {
+                build = 0;
+            }
+            if (revision > UInt16.MaxValue)
+            {
+                throw new ArgumentOutOfRangeException("version", String.Format(normalizeVersionFormatString, "Revision"));
+            }
+            if (revision == -1)
+            {
+                revision = 0;
+            }
+
+            return new Version(major, minor, build, revision);
+        }
+    }
+}