From d3d3649a68cb1fa589fdd987a6690dbd5d671f0d Mon Sep 17 00:00:00 2001
From: Rob Mensching <rob@firegiant.com>
Date: Sun, 17 Sep 2017 15:35:20 -0700
Subject: Initial code commit

---
 src/WixToolset.Core/Bind/ExtractEmbeddedFiles.cs | 83 ++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 src/WixToolset.Core/Bind/ExtractEmbeddedFiles.cs

(limited to 'src/WixToolset.Core/Bind/ExtractEmbeddedFiles.cs')

diff --git a/src/WixToolset.Core/Bind/ExtractEmbeddedFiles.cs b/src/WixToolset.Core/Bind/ExtractEmbeddedFiles.cs
new file mode 100644
index 00000000..0ecd0096
--- /dev/null
+++ b/src/WixToolset.Core/Bind/ExtractEmbeddedFiles.cs
@@ -0,0 +1,83 @@
+// 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.Bind
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Globalization;
+    using System.IO;
+    using System.Linq;
+    using System.Security.Cryptography;
+    using System.Text;
+
+    /// <summary>
+    /// Internal helper class used to extract embedded files.
+    /// </summary>
+    internal sealed class ExtractEmbeddedFiles
+    {
+        private Dictionary<Uri, SortedList<int, string>> filesWithEmbeddedFiles = new Dictionary<Uri, SortedList<int, string>>();
+
+        public IEnumerable<Uri> Uris { get { return this.filesWithEmbeddedFiles.Keys; } }
+
+        /// <summary>
+        /// Adds an embedded file index to track and returns the path where the embedded file will be extracted. Duplicates will return the same extract path.
+        /// </summary>
+        /// <param name="uri">Uri to file containing the embedded files.</param>
+        /// <param name="embeddedFileIndex">Index of the embedded file to extract.</param>
+        /// <param name="tempPath">Path where temporary files should be placed.</param>
+        /// <returns>The extract path for the embedded file.</returns>
+        public string AddEmbeddedFileIndex(Uri uri, int embeddedFileIndex, string tempPath)
+        {
+            string extractPath;
+            SortedList<int, string> extracts;
+
+            // If the uri to the file that contains the embedded file does not already have embedded files
+            // being extracted, create the dictionary to track that.
+            if (!filesWithEmbeddedFiles.TryGetValue(uri, out extracts))
+            {
+                extracts = new SortedList<int, string>();
+                filesWithEmbeddedFiles.Add(uri, extracts);
+            }
+
+            // If the embedded file is not already tracked in the dictionary of extracts, add it.
+            if (!extracts.TryGetValue(embeddedFileIndex, out extractPath))
+            {
+                string localFileNameWithoutExtension = Path.GetFileNameWithoutExtension(uri.LocalPath);
+                string unique = this.HashUri(uri.AbsoluteUri);
+                string extractedName = String.Format(CultureInfo.InvariantCulture, @"{0}_{1}\{2}", localFileNameWithoutExtension, unique, embeddedFileIndex);
+
+                extractPath = Path.Combine(tempPath, extractedName);
+                extracts.Add(embeddedFileIndex, extractPath);
+            }
+
+            return extractPath;
+        }
+
+        public IEnumerable<ExtractFile> GetExtractFilesForUri(Uri uri)
+        {
+            SortedList<int, string> extracts;
+            if (!filesWithEmbeddedFiles.TryGetValue(uri, out extracts))
+            {
+                extracts = new SortedList<int, string>();
+            }
+
+            return extracts.Select(e => new ExtractFile() { EmbeddedFileIndex = e.Key, OutputPath = e.Value });
+        }
+
+        private string HashUri(string uri)
+        {
+            using (SHA1 sha1 = new SHA1CryptoServiceProvider())
+            {
+                byte[] hash = sha1.ComputeHash(Encoding.UTF8.GetBytes(uri));
+                return Convert.ToBase64String(hash).TrimEnd('=').Replace('+', '-').Replace('/', '_');
+            }
+        }
+
+        internal struct ExtractFile
+        {
+            public int EmbeddedFileIndex { get; set; }
+
+            public string OutputPath { get; set; }
+        }
+    }
+}
-- 
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