Only extract files when necessary

Bloxstrap/Bootstrapper.cs

@@ -60,6 +60,7 @@ namespace Bloxstrap
 
         private string _latestVersionGuid = null!;
         private PackageManifest _versionPackageManifest = null!;
+        private FileManifest _versionFileManifest = null!;
         private string _versionFolder = null!;
 
         private bool _isInstalling = false;
@@ -262,6 +263,7 @@ namespace Bloxstrap
             _latestVersionGuid = clientVersion.VersionGuid;
             _versionFolder = Path.Combine(Paths.Versions, _latestVersionGuid);
             _versionPackageManifest = await PackageManifest.Get(_latestVersionGuid);
+            _versionFileManifest = await FileManifest.Get(_latestVersionGuid);
         }
 
         private async Task StartRoblox()
@@ -1402,6 +1404,16 @@ namespace Bloxstrap
                 if (directory is not null)
                     Directory.CreateDirectory(directory);
 
+                if (File.Exists(extractPath))
+                {
+                    var fileManifest = _versionFileManifest.FirstOrDefault(x => x.Name == Path.Combine(PackageDirectories[package.Name], entry.FullName));
+
+                    if (fileManifest is not null && MD5Hash.FromFile(extractPath) == fileManifest.Signature)
+                        continue;
+
+                    File.Delete(extractPath);
+                }
+
                 entry.ExtractToFile(extractPath, true);
             }
 

Bloxstrap/GlobalUsings.cs

@@ -18,8 +18,9 @@ global using Bloxstrap.Enums;
 global using Bloxstrap.Exceptions;
 global using Bloxstrap.Extensions;
 global using Bloxstrap.Models;
-global using Bloxstrap.Models.BloxstrapRPC;
 global using Bloxstrap.Models.Attributes;
+global using Bloxstrap.Models.BloxstrapRPC;
 global using Bloxstrap.Models.RobloxApi;
+global using Bloxstrap.Models.Manifest;
 global using Bloxstrap.UI;
 global using Bloxstrap.Utility;

Bloxstrap/Models/Manifest/FileManifest.cs

@@ -0,0 +1,33 @@
+namespace Bloxstrap.Models.Manifest
+{
+    public class FileManifest : List<ManifestFile>
+    {
+        private FileManifest(string data)
+        {
+            using StringReader reader = new StringReader(data);
+
+            while (true)
+            {
+                string? fileName = reader.ReadLine();
+                string? signature = reader.ReadLine();
+
+                if (string.IsNullOrEmpty(fileName) || string.IsNullOrEmpty(signature))
+                    break;
+
+                Add(new ManifestFile
+                {
+                    Name = fileName,
+                    Signature = signature
+                });
+            }
+        }
+
+        public static async Task<FileManifest> Get(string versionGuid)
+        {
+            string pkgManifestUrl = RobloxDeployment.GetLocation($"/{versionGuid}-rbxManifest.txt");
+            var pkgManifestData = await App.HttpClient.GetStringAsync(pkgManifestUrl);
+
+            return new FileManifest(pkgManifestData);
+        }
+    }
+}

Bloxstrap/Models/Manifest/ManifestFile.cs

@@ -0,0 +1,13 @@
+namespace Bloxstrap.Models.Manifest
+{
+    public class ManifestFile
+    {
+        public string Name { get; set; } = "";
+        public string Signature { get; set; } = "";
+
+        public override string ToString()
+        {
+            return $"[{Signature}] {Name}";
+        }
+    }
+}

Bloxstrap/Models/Manifest/Package.cs

@@ -4,7 +4,7 @@
  * Copyright (c) 2015-present MaximumADHD
 */
 
-namespace Bloxstrap.Models
+namespace Bloxstrap.Models.Manifest
 {
     public class Package
     {

Bloxstrap/Models/Manifest/PackageManifest.cs

@@ -4,7 +4,7 @@
  * Copyright (c) 2015-present MaximumADHD
 */
 
-namespace Bloxstrap.Models
+namespace Bloxstrap.Models.Manifest
 {
     public class PackageManifest : List<Package>
     {