1 files changed, 63 insertions, 0 deletions
diff --git a/MediaBrowser.Common/Extensions/BaseExtensions.cs b/MediaBrowser.Common/Extensions/BaseExtensions.cs
new file mode 100644
index 000000000..77eb9fbb4
--- /dev/null
+++ b/MediaBrowser.Common/Extensions/BaseExtensions.cs
@@ -0,0 +1,63 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Security.Cryptography;
+
+namespace MediaBrowser.Common.Extensions
+{
+    public static class BaseExtensions
+    {
+        static MD5CryptoServiceProvider md5Provider = new MD5CryptoServiceProvider();
+
+        public static Guid GetMD5(this string str)
+        {
+            lock (md5Provider)
+            {
+                return new Guid(md5Provider.ComputeHash(Encoding.Unicode.GetBytes(str)));
+            }
+        }
+
+        /// <summary>
+        /// Examine a list of strings assumed to be file paths to see if it contains a parent of 
+        /// the provided path.
+        /// </summary>
+        /// <param name="lst"></param>
+        /// <param name="path"></param>
+        /// <returns></returns>
+        public static bool ContainsParentFolder(this List<string> lst, string path)
+        {
+            path = path.TrimEnd('\\');
+            foreach (var str in lst)
+            {
+                //this should be a little quicker than examining each actual parent folder...
+                var compare = str.TrimEnd('\\');
+                if (path.Equals(compare,StringComparison.OrdinalIgnoreCase) 
+                    || (path.StartsWith(compare, StringComparison.OrdinalIgnoreCase) && path[compare.Length] == '\\')) return true;
+            }
+            return false;
+        }
+
+        /// <summary>
+        /// Helper method for Dictionaries since they throw on not-found keys
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <typeparam name="U"></typeparam>
+        /// <param name="dictionary"></param>
+        /// <param name="key"></param>
+        /// <param name="defaultValue"></param>
+        /// <returns></returns>
+        public static U GetValueOrDefault<T, U>(this Dictionary<T, U> dictionary, T key, U defaultValue)
+        {
+            U val;
+            if (!dictionary.TryGetValue(key, out val))
+            {
+                val = defaultValue;
+            }
+            return val;
+
+        }
+
+    }
+}