From 4c0e7f5896adba719aebbb696c80eaa420c21fe0 Mon Sep 17 00:00:00 2001
From: pizzaboxer <41478239+pizzaboxer@users.noreply.github.com>
Date: Tue, 23 Aug 2022 20:15:04 +0100
Subject: [PATCH] Fix mod presets being deleted when changed

---
 Bloxstrap/Bootstrapper.cs      | 5 +++--
 Bloxstrap/Helpers/Utilities.cs | 9 +++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/Bloxstrap/Bootstrapper.cs b/Bloxstrap/Bootstrapper.cs
index 350956b..2042ad7 100644
--- a/Bloxstrap/Bootstrapper.cs
+++ b/Bloxstrap/Bootstrapper.cs
@@ -563,6 +563,7 @@ namespace Bloxstrap
         private static void CheckModPreset(bool condition, string location, string base64Contents)
         {
             string modFolderLocation = Path.Combine(Directories.Modifications, location);
+            byte[] binaryData = Convert.FromBase64String(base64Contents);
 
             if (condition)
             {
@@ -575,10 +576,10 @@ namespace Bloxstrap
 
                     Directory.CreateDirectory(directory);
 
-                    File.WriteAllBytes(modFolderLocation, Convert.FromBase64String(base64Contents));
+                    File.WriteAllBytes(modFolderLocation, binaryData);
                 }
             }
-            else if (File.Exists(modFolderLocation))
+            else if (File.Exists(modFolderLocation) && Utilities.MD5File(modFolderLocation) == Utilities.MD5Data(binaryData))
             {
                 File.Delete(modFolderLocation);
             }
diff --git a/Bloxstrap/Helpers/Utilities.cs b/Bloxstrap/Helpers/Utilities.cs
index 022136f..22a60d4 100644
--- a/Bloxstrap/Helpers/Utilities.cs
+++ b/Bloxstrap/Helpers/Utilities.cs
@@ -36,6 +36,15 @@ namespace Bloxstrap.Helpers
             }
         }
 
+        public static string MD5Data(byte[] data)
+        {
+            using (MD5 md5 = MD5.Create())
+            {
+                byte[] hash = md5.ComputeHash(data);
+                return BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();
+            }
+        }
+
         // quick and hacky way of getting a value from any key/value pair formatted list
         // (command line args, uri params, etc)
         public static string? GetKeyValue(string subject, string key, char delimiter)