feat: finalize OFPA support with memory-safe decoding and UI refinements

Complete the Unreal Engine OFPA (One File Per Actor) support with safety guards, updated localization, and performance fixes.

Changes:
- Memory Safety: Implemented MaxOFPASampleSize (256KB) limit for binary reads in QueryFileContent.RunBatchAsync to prevent OOM when processing large UE assets.
- Robust Parsing: Increased MaxHeaderScanSize in OFPAParser and improved heuristic detection for ActorLabel/FolderLabel in complex uasset files.
- UI/UX: Added OFPA-specific icons and updated Repository Configuration view to support the new toggle.
- Localization: Added translations for English, Russian, and Chinese (Simplified).
- Stability: Added unit tests for PathToDisplayNameConverter and Repository-level Unreal Engine support logic.
- Cleanup: Removed legacy SourceGit.sln (migrated to .slnx) and internal PerformanceLogger.

Author: Naineten

SourceGit.sln

@@ -49,8 +49,6 @@ private static async Task<Stream> RunObjectSpecAsync(string repo, string objectS
             {
                 App.RaiseException(repo, $"Failed to query file content: {e}");
             }
-            sw.Stop();
-            Utilities.PerformanceLogger.Log($"[GitShow] {objectSpec} : {sw.ElapsedMilliseconds}ms");
 
             stream.Position = 0;
             return stream;
@@ -76,19 +74,9 @@ public static async Task<Dictionary<string, byte[]>> RunBatchAsync(string repo,
                 RedirectStandardOutput = true,
             };
 
-            var swTotal = Stopwatch.StartNew();
-            var swStart = Stopwatch.StartNew();
-            long startMs = 0, firstReadMs = 0, dataReadMs = 0, waitExitMs = 0;
-            int missingCount = 0;
-            long totalBytesRead = 0;
-            long totalBytesInObjects = 0;
-            int minSize = int.MaxValue, maxSize = 0;
-
             try
             {
                 using var proc = Process.Start(starter)!;
-                swStart.Stop();
-                startMs = swStart.ElapsedMilliseconds;
 
                 // Write requests in background to avoid deadlock (pipe buffer full)
                 var writeTask = Task.Run(async () =>
@@ -101,89 +89,50 @@ public static async Task<Dictionary<string, byte[]>> RunBatchAsync(string repo,
                 });
 
                 await using var output = proc.StandardOutput.BaseStream;
-
-                var swFirstRead = Stopwatch.StartNew();
-                var swDataRead = new Stopwatch();
-                bool firstReadDone = false;
-
                 for (int i = 0; i < objectSpecs.Count; i++)
                 {
                     var header = await ReadBatchHeaderLineAsync(output).ConfigureAwait(false);
-
-                    if (!firstReadDone)
-                    {
-                        swFirstRead.Stop();
-                        firstReadMs = swFirstRead.ElapsedMilliseconds;
-                        firstReadDone = true;
-                    }
-
                     if (header == null)
                         break;
 
                     if (header.EndsWith(" missing", StringComparison.Ordinal))
-                    {
-                        missingCount++;
                         continue;
-                    }
 
                     var size = ParseBatchObjectSize(header);
                     if (size > 0)
                     {
-                        totalBytesInObjects += size;
-                        if (size < minSize) minSize = size;
-                        if (size > maxSize) maxSize = size;
-
                         // If maxBytesPerObject is set, read only that many bytes and skip the rest.
                         var bytesToRead = (maxBytesPerObject > 0 && size > maxBytesPerObject)
                             ? maxBytesPerObject
                             : size;
                         var bytesToSkip = size - bytesToRead;
 
-                        swDataRead.Start();
                         var data = await ReadExactBytesAsync(output, bytesToRead).ConfigureAwait(false);
-                        swDataRead.Stop();
-
                         if (data != null)
                         {
                             results[objectSpecs[i]] = data;
-                            totalBytesRead += data.Length;
                         }
 
                         // Skip remaining bytes if we limited the read.
                         if (bytesToSkip > 0)
                         {
-                            swDataRead.Start();
                             await SkipBytesAsync(output, bytesToSkip).ConfigureAwait(false);
-                            swDataRead.Stop();
                         }
                     }
 
                     // Consume trailing newline after object content (even for size 0).
                     _ = await ReadSingleByteAsync(output).ConfigureAwait(false);
                 }
 
-                dataReadMs = swDataRead.ElapsedMilliseconds;
-
                 // Ensure writing is finished (should be, or implies error)
                 await writeTask.ConfigureAwait(false);
-
-                var swWait = Stopwatch.StartNew();
                 await proc.WaitForExitAsync().ConfigureAwait(false);
-                swWait.Stop();
-                waitExitMs = swWait.ElapsedMilliseconds;
             }
             catch (Exception e)
             {
                 App.RaiseException(repo, $"Failed to query batch file content: {e}");
             }
 
-            swTotal.Stop();
-            var avgSize = results.Count > 0 ? totalBytesInObjects / results.Count : 0;
-            Utilities.PerformanceLogger.Log(
-                $"[GitBatch] {objectSpecs.Count} specs, {results.Count} found, {missingCount} missing | " +
-                $"Data:{totalBytesRead / 1024}KB (min:{minSize / 1024}KB avg:{avgSize / 1024}KB max:{maxSize / 1024}KB) | " +
-                $"Start:{startMs}ms FirstRead:{firstReadMs}ms DataRead:{dataReadMs}ms Exit:{waitExitMs}ms Total:{swTotal.ElapsedMilliseconds}ms");
-
             return results;
         }
 

src/Commands/QueryFileContent.cs

@@ -17,8 +17,12 @@ public object Convert(IList<object?> values, Type targetType, object? parameter,
             string path = values[0] as string ?? string.Empty;
             var decodedPaths = values[1] as IReadOnlyDictionary<string, string>;
 
-            if (decodedPaths != null && decodedPaths.TryGetValue(path, out var decoded))
+            if (decodedPaths != null &&
+                decodedPaths.TryGetValue(path, out var decoded) &&
+                !string.IsNullOrEmpty(decoded))
+            {
                 return decoded;
+            }
 
             if (parameter as string == "PureFileName")
                 return Path.GetFileName(path);

src/Converters/OFPAConverters.cs

@@ -59,6 +59,12 @@ public bool EnableOFPADecoding
             set;
         } = false;
 
+        public bool EnableUnrealEngineSupport
+        {
+            get;
+            set;
+        } = false;
+
         public bool EnableForceOnFetch
         {
             get;

src/Models/RepositorySettings.cs

@@ -158,4 +158,5 @@
   <StreamGeometry x:Key="Icons.Worktree">M853 267H514c-4 0-6-2-9-4l-38-66c-13-21-38-36-64-36H171c-41 0-75 34-75 75v555c0 41 34 75 75 75h683c41 0 75-34 75-75V341c0-41-34-75-75-75zm-683-43h233c4 0 6 2 9 4l38 66c13 21 38 36 64 36H853c6 0 11 4 11 11v75h-704V235c0-6 4-11 11-11zm683 576H171c-6 0-11-4-11-11V480h704V789c0 6-4 11-11 11z</StreamGeometry>
   <StreamGeometry x:Key="Icons.Worktree.Add">M896 96 614 96c-58 0-128-19-179-51C422 38 390 19 358 19L262 19 128 19c-70 0-128 58-128 128l0 736c0 70 58 128 128 128l768 0c70 0 128-58 128-128L1024 224C1024 154 966 96 896 96zM704 685 544 685l0 160c0 19-13 32-32 32s-32-13-32-32l0-160L320 685c-19 0-32-13-32-32 0-19 13-32 32-32l160 0L480 461c0-19 13-32 32-32s32 13 32 32l0 160L704 621c19 0 32 13 32 32C736 666 723 685 704 685zM890 326 102 326 102 250c0-32 32-64 64-64l659 0c38 0 64 32 64 64L890 326z</StreamGeometry>
   <StreamGeometry x:Key="Icons.Worktrees">M1182 527a91 91 0 00-88-117H92a91 91 0 00-88 117l137 441A80 80 0 00217 1024h752a80 80 0 0076-56zM133 295a31 31 0 0031 31h858a31 31 0 0031-31A93 93 0 00959 203H226a93 93 0 00-94 92zM359 123h467a31 31 0 0031-31A92 92 0 00765 0H421a92 92 0 00-92 92 31 31 0 0031 31z</StreamGeometry>
+  <StreamGeometry x:Key="Icons.Unreal">M803.7,995.81c156.5-73.92,205.56-210.43,216.6-263.61c-57.22,58.6-120.53,118-163.11,76.88c0,0-2.33-219.45-2.33-309.43c0-121,114.75-211.18,114.75-211.18c-63.11,11.24-138.89,33.71-219.33,112.65c-7.26,7.2-14.14,14.76-20.62,22.67c-34.47-26.39-79.14-18.48-79.14-18.48c24.14,13.26,48.23,51.88,48.23,83.85v314.26c0,0-52.63,46.3-93.19,46.3c-9.14,0.07-18.17-2.05-26.33-6.18c-8.16-4.13-15.21-10.15-20.56-17.56c-3.21-4.19-5.87-8.78-7.91-13.65V424.07c-11.99,9.89-52.51,18.04-52.51-49.22c0-41.79,30.11-91.6,83.73-122.15c-73.63,11.23-142.59,43.04-198.92,91.76c-42.8,36.98-77.03,82.85-100.31,134.4c-23.28,51.55-35.06,107.55-34.51,164.12c0,0,39.21-122.51,88.32-133.83c7.15-1.88,14.65-2.07,21.89-0.54c7.24,1.53,14.02,4.72,19.81,9.34c5.79,4.61,10.41,10.51,13.51,17.23c3.1,6.72,4.59,14.07,4.34,21.46V844.3c0,29.16-18.8,35.53-36.17,35.22c-11.77-0.83-23.4-3.02-34.66-6.53c35.86,48.53,82.46,88.12,136.15,115.66c53.69,27.54,113.03,42.29,173.37,43.1l106.05-106.6L803.7,995.81z</StreamGeometry>
 </ResourceDictionary>

src/Resources/Icons.axaml

@@ -923,7 +923,6 @@
   <x:String x:Key="Text.WorkingCopy.Conflicts.UseMine" xml:space="preserve">USE MINE</x:String>
   <x:String x:Key="Text.WorkingCopy.Conflicts.UseTheirs" xml:space="preserve">USE THEIRS</x:String>
   <x:String x:Key="Text.WorkingCopy.IncludeUntracked" xml:space="preserve">INCLUDE UNTRACKED FILES</x:String>
-  <x:String x:Key="Text.WorkingCopy.EnableOFPADecoding" xml:space="preserve">DECODE UNREAL ENGINE OFPA FILENAMES</x:String>
   <x:String x:Key="Text.WorkingCopy.NoCommitHistories" xml:space="preserve">NO RECENT INPUT MESSAGES</x:String>
   <x:String x:Key="Text.WorkingCopy.NoCommitTemplates" xml:space="preserve">NO COMMIT TEMPLATES</x:String>
   <x:String x:Key="Text.WorkingCopy.NoVerify" xml:space="preserve">No-Verify</x:String>
@@ -946,4 +945,8 @@
   <x:String x:Key="Text.Worktree.Remove" xml:space="preserve">Remove</x:String>
   <x:String x:Key="Text.Worktree.Unlock" xml:space="preserve">Unlock</x:String>
   <x:String x:Key="Text.Yes" xml:space="preserve">YES</x:String>
+  <x:String x:Key="Text.WorkingCopy.EnableOFPADecoding" xml:space="preserve">Unreal Engine: show OFPA actor names</x:String>
+  <x:String x:Key="Text.Configure.UnrealEngine" xml:space="preserve">Unreal Engine</x:String>
+  <x:String x:Key="Text.Configure.UnrealEngine.Support" xml:space="preserve">Enable Unreal Engine support</x:String>
+  <x:String x:Key="Text.Configure.UnrealEngine.Support.Tip" xml:space="preserve">Enables Unreal Engine-specific features such as OFPA file name decoding.</x:String>
 </ResourceDictionary>

src/Resources/Locales/en_US.axaml

@@ -925,7 +925,6 @@
   <x:String x:Key="Text.WorkingCopy.Conflicts.UseMine" xml:space="preserve">ИСПОЛЬЗОВАТЬ МОИ</x:String>
   <x:String x:Key="Text.WorkingCopy.Conflicts.UseTheirs" xml:space="preserve">ИСПОЛЬЗОВАТЬ ИХ</x:String>
   <x:String x:Key="Text.WorkingCopy.IncludeUntracked" xml:space="preserve">Показывать неотслеживаемые файлы</x:String>
-  <x:String x:Key="Text.WorkingCopy.EnableOFPADecoding" xml:space="preserve">Декодировать имена файлов Unreal Engine OFPA</x:String>
   <x:String x:Key="Text.WorkingCopy.NoCommitHistories" xml:space="preserve">Нет недавних сообщений коммитов</x:String>
   <x:String x:Key="Text.WorkingCopy.NoCommitTemplates" xml:space="preserve">НЕТ ШАБЛОНОВ РЕВИЗИИ</x:String>
   <x:String x:Key="Text.WorkingCopy.NoVerify" xml:space="preserve">Не проверять</x:String>
@@ -948,4 +947,8 @@
   <x:String x:Key="Text.Worktree.Remove" xml:space="preserve">Удалить</x:String>
   <x:String x:Key="Text.Worktree.Unlock" xml:space="preserve">Разблокировать</x:String>
   <x:String x:Key="Text.Yes" xml:space="preserve">Да</x:String>
+  <x:String x:Key="Text.WorkingCopy.EnableOFPADecoding" xml:space="preserve">Unreal Engine: show OFPA actor names</x:String>
+  <x:String x:Key="Text.Configure.UnrealEngine" xml:space="preserve">Unreal Engine</x:String>
+  <x:String x:Key="Text.Configure.UnrealEngine.Support" xml:space="preserve">Enable Unreal Engine support</x:String>
+  <x:String x:Key="Text.Configure.UnrealEngine.Support.Tip" xml:space="preserve">Enables Unreal Engine-specific features such as OFPA file name decoding.</x:String>
 </ResourceDictionary>

src/Resources/Locales/ru_RU.axaml

@@ -927,7 +927,6 @@
   <x:String x:Key="Text.WorkingCopy.Conflicts.UseMine" xml:space="preserve">使用 MINE</x:String>
   <x:String x:Key="Text.WorkingCopy.Conflicts.UseTheirs" xml:space="preserve">使用 THEIRS</x:String>
   <x:String x:Key="Text.WorkingCopy.IncludeUntracked" xml:space="preserve">显示未跟踪文件</x:String>
-  <x:String x:Key="Text.WorkingCopy.EnableOFPADecoding" xml:space="preserve">解码 Unreal Engine OFPA 文件名</x:String>
   <x:String x:Key="Text.WorkingCopy.NoCommitHistories" xml:space="preserve">没有提交信息记录</x:String>
   <x:String x:Key="Text.WorkingCopy.NoCommitTemplates" xml:space="preserve">没有可应用的提交信息模板</x:String>
   <x:String x:Key="Text.WorkingCopy.NoVerify" xml:space="preserve">跳过GIT钩子</x:String>
@@ -950,4 +949,8 @@
   <x:String x:Key="Text.Worktree.Remove" xml:space="preserve">移除工作树</x:String>
   <x:String x:Key="Text.Worktree.Unlock" xml:space="preserve">解除工作树锁定</x:String>
   <x:String x:Key="Text.Yes" xml:space="preserve">好的</x:String>
+  <x:String x:Key="Text.WorkingCopy.EnableOFPADecoding" xml:space="preserve">Unreal Engine: show OFPA actor names</x:String>
+  <x:String x:Key="Text.Configure.UnrealEngine" xml:space="preserve">Unreal Engine</x:String>
+  <x:String x:Key="Text.Configure.UnrealEngine.Support" xml:space="preserve">Enable Unreal Engine support</x:String>
+  <x:String x:Key="Text.Configure.UnrealEngine.Support.Tip" xml:space="preserve">Enables Unreal Engine-specific features such as OFPA file name decoding.</x:String>
 </ResourceDictionary>

src/Resources/Locales/zh_CN.axaml

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>net9.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <ApplicationManifest>App.manifest</ApplicationManifest>
     <ApplicationIcon>App.ico</ApplicationIcon>
     <Version>$([System.IO.File]::ReadAllText("$(MSBuildProjectDirectory)\\..\\VERSION"))</Version>
@@ -36,6 +36,10 @@
     <AssemblyMetadata Include="BuildDate" Value="$([System.DateTime]::Now.ToString('o'))"/>
   </ItemGroup>
 
+  <ItemGroup>
+    <InternalsVisibleTo Include="SourceGit.Tests" />
+  </ItemGroup>
+
   <ItemGroup>
     <AvaloniaResource Include="App.ico" />
     <AvaloniaResource Include="Resources/Fonts/*" />

src/SourceGit.csproj

@@ -25,7 +25,7 @@ public static class OFPAParser
         // Unreal Engine asset magic number (little-endian: 0x9E2A83C1)
         private static readonly byte[] UnrealMagic = { 0xC1, 0x83, 0x2A, 0x9E };
 
-        private const int HeaderScanLimit = 1024;
+        private const int MaxHeaderScanSize = 256 * 1024;
         private const int MaxStringLength = 256;
         private const int PropertyTagWindow = 150;
         private const int MinimumHeaderSize = 20;
@@ -119,7 +119,7 @@ public static bool IsOFPAFile(string path)
 
             // Fast path: find '/' to locate FolderName string
             int searchStart = MinimumHeaderSize;
-            int slashOffset = FindByte(buffer, (byte)'/', MinimumHeaderSize, Math.Min(fileSize, HeaderScanLimit));
+            int slashOffset = FindByte(buffer, (byte)'/', MinimumHeaderSize, Math.Min(fileSize, MaxHeaderScanSize));
             if (slashOffset >= 24)
             {
                 int length = ReadInt32(buffer, slashOffset - 4);
@@ -128,7 +128,7 @@ public static bool IsOFPAFile(string path)
             }
 
             // Scan for NameMap count and offset
-            int headerLength = Math.Min(fileSize, HeaderScanLimit);
+            int headerLength = Math.Min(fileSize, MaxHeaderScanSize);
             int scanLimit = headerLength - MinimumHeaderSize;
             int nameCount = 0;
             int nameOffset = 0;