Re-introduce "decompile" to backend

1 files changed, 110 insertions, 0 deletions

diff --git a/src/WixToolset.Core.WindowsInstaller/Decompile/DecompilerCore.cs b/src/WixToolset.Core.WindowsInstaller/Decompile/DecompilerCore.cs
new file mode 100644
index 00000000..17c97e09
--- /dev/null
+++ b/src/WixToolset.Core.WindowsInstaller/Decompile/DecompilerCore.cs
@@ -0,0 +1,110 @@
+// 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
+{
+    using System;
+    using System.Collections;
+    using WixToolset.Data.WindowsInstaller;
+    using WixToolset.Extensibility;
+    using Wix = WixToolset.Data.Serialize;
+
+    /// <summary>
+    /// The base of the decompiler. Holds some variables used by the decompiler and extensions,
+    /// as well as some utility methods.
+    /// </summary>
+    internal class DecompilerCore
+    {
+        private readonly Hashtable elements;
+        private Wix.UI uiElement;
+
+        /// <summary>
+        /// Instantiate a new decompiler core.
+        /// </summary>
+        /// <param name="rootElement">The root element of the decompiled database.</param>
+        /// <param name="messageHandler">The message handler.</param>
+        internal DecompilerCore(Wix.IParentElement rootElement)
+        {
+            this.elements = new Hashtable();
+            this.RootElement = rootElement;
+        }
+
+        /// <summary>
+        /// Gets the root element of the decompiled output.
+        /// </summary>
+        /// <value>The root element of the decompiled output.</value>
+        public Wix.IParentElement RootElement { get; }
+
+        /// <summary>
+        /// Gets the UI element.
+        /// </summary>
+        /// <value>The UI element.</value>
+        public Wix.UI UIElement
+        {
+            get
+            {
+                if (null == this.uiElement)
+                {
+                    this.uiElement = new Wix.UI();
+                    this.RootElement.AddChild(this.uiElement);
+                }
+
+                return this.uiElement;
+            }
+        }
+
+        /// <summary>
+        /// Verifies if a filename is a valid short filename.
+        /// </summary>
+        /// <param name="filename">Filename to verify.</param>
+        /// <param name="allowWildcards">true if wildcards are allowed in the filename.</param>
+        /// <returns>True if the filename is a valid short filename</returns>
+        public virtual bool IsValidShortFilename(string filename, bool allowWildcards)
+        {
+            return false;
+        }
+
+        /// <summary>
+        /// Convert an Int32 into a DateTime.
+        /// </summary>
+        /// <param name="value">The Int32 value.</param>
+        /// <returns>The DateTime.</returns>
+        public DateTime ConvertIntegerToDateTime(int value)
+        {
+            var date = value / 65536;
+            var time = value % 65536;
+
+            return new DateTime(1980 + (date / 512), (date % 512) / 32, date % 32, time / 2048, (time % 2048) / 32, (time % 32) * 2);
+        }
+
+        /// <summary>
+        /// Gets the element corresponding to the row it came from.
+        /// </summary>
+        /// <param name="row">The row corresponding to the element.</param>
+        /// <returns>The indexed element.</returns>
+        public Wix.ISchemaElement GetIndexedElement(Row row)
+        {
+            return this.GetIndexedElement(row.TableDefinition.Name, row.GetPrimaryKey(DecompilerConstants.PrimaryKeyDelimiter));
+        }
+
+        /// <summary>
+        /// Gets the element corresponding to the primary key of the given table.
+        /// </summary>
+        /// <param name="table">The table corresponding to the element.</param>
+        /// <param name="primaryKey">The primary key corresponding to the element.</param>
+        /// <returns>The indexed element.</returns>
+        public Wix.ISchemaElement GetIndexedElement(string table, params string[] primaryKey)
+        {
+            return (Wix.ISchemaElement)this.elements[String.Concat(table, ':', String.Join(DecompilerConstants.PrimaryKeyDelimiterString, primaryKey))];
+        }
+
+        /// <summary>
+        /// Index an element by its corresponding row.
+        /// </summary>
+        /// <param name="row">The row corresponding to the element.</param>
+        /// <param name="element">The element to index.</param>
+        public void IndexElement(Row row, Wix.ISchemaElement element)
+        {
+            this.elements.Add(String.Concat(row.TableDefinition.Name, ':', row.GetPrimaryKey(DecompilerConstants.PrimaryKeyDelimiter)), element);
+        }
+    }
+}