Add bus encryption enabled method

CHANGELIST.md

@@ -20,6 +20,7 @@
 - Futureproof GD-ROM LD in Redumper
 - Make GD-ROM LD code nicer to read
 - Rename 2 XGD helper methods
+- Add bus encryption enabled method
 
 ### 3.2.1 (2024-08-05)
 

MPF.Frontend/Tools/ProtectionTool.cs

@@ -128,6 +128,54 @@ namespace MPF.Frontend.Tools
             return protectionString;
         }
 
+        /// <summary>
+        /// Get if the Bus Encryption Enabled (BEE) flag is set in a path
+        /// </summary>
+        /// <param name="path">Path to scan for bus encryption enabled</param>
+        /// <returns>Bus encryption enabled status if possible, false otherwise</returns>
+        public static bool GetBusEncryptionEnabled(string? path)
+        {
+            // If there is no valid path
+            if (string.IsNullOrEmpty(path))
+                return false;
+            else if (!Directory.Exists(path))
+                return false;
+
+            // Get the two possible file paths
+#if NET20 || NET35
+            string content000 = Path.Combine(Path.Combine(path, "AACS"), "Content000.cer");
+            string content001 = Path.Combine(Path.Combine(path, "AACS"), "Content001.cer");
+#else
+            string content000 = Path.Combine(path, "AACS", "Content000.cer");
+            string content001 = Path.Combine(path, "AACS", "Content001.cer");
+#endif
+
+            try
+            {
+                // Check the required files
+                if (File.Exists(content000) && new FileInfo(content000).Length > 1)
+                {
+                    using var fs = File.OpenRead(content000);
+                    _ = fs.ReadByte(); // Skip the first byte
+                    return fs.ReadByte() > 127;
+                }
+                else if (File.Exists(content001) && new FileInfo(content001).Length > 1)
+                {
+                    using var fs = File.OpenRead(content001);
+                    _ = fs.ReadByte(); // Skip the first byte
+                    return fs.ReadByte() > 127;
+                }
+
+                // False if neither file fits the criteria
+                return false;
+            }
+            catch
+            {
+                // We don't care what the error is right now
+                return false;
+            }
+        }
+
         /// <summary>
         /// Get the existence of an anti-modchip string from a PlayStation disc, if possible
         /// </summary>