improve:自动更新

Ink Canvas/Helpers/AutoUpdateHelper.cs

@@ -1431,7 +1431,7 @@ namespace Ink_Canvas.Helpers
                 try
                 {
                     LogHelper.WriteLogToFile($"AutoUpdate | 开始解压ZIP文件到: {extractPath}");
-                    ZipFile.ExtractToDirectory(zipFilePath, extractPath);
+                    SafeZipExtractor.ExtractZipSafely(zipFilePath, extractPath, overwrite: true);
                     LogHelper.WriteLogToFile("AutoUpdate | ZIP文件解压完成");
                 }
                 catch (Exception ex)

Ink Canvas/Helpers/HardwareAcceleratedInkProcessor.cs

@@ -186,11 +186,11 @@ namespace Ink_Canvas.Helpers
         }
 
         /// <summary>
-        /// 释放GPU资源
+        /// 释放GPU相关资源标记
         /// </summary>
         public void Dispose()
         {
-            _renderTarget?.Clear();
+
             _isInitialized = false;
         }
     }

Ink Canvas/Helpers/MultiTouchInput.cs

@@ -209,9 +209,5 @@ namespace Ink_Canvas.Helpers
 
         private readonly DrawingAttributes _drawingAttributes;
 
-        public static implicit operator Stroke(StrokeVisual v)
-        {
-            throw new NotImplementedException();
-        }
     }
 }

Ink Canvas/Helpers/SafeZipExtractor.cs

@@ -0,0 +1,75 @@
+using System;
+using System.IO;
+using System.IO.Compression;
+
+namespace Ink_Canvas.Helpers
+{
+    public static class SafeZipExtractor
+    {
+        /// <param name="zipFilePath">ZIP 文件路径</param>
+        /// <param name="extractPath">解压目标目录</param>
+        /// <param name="overwrite">是否覆盖已存在文件</param>
+        public static void ExtractZipSafely(string zipFilePath, string extractPath, bool overwrite = true)
+        {
+            if (string.IsNullOrWhiteSpace(zipFilePath))
+                throw new ArgumentNullException(nameof(zipFilePath));
+            if (string.IsNullOrWhiteSpace(extractPath))
+                throw new ArgumentNullException(nameof(extractPath));
+
+            var fullExtractPath = Path.GetFullPath(extractPath);
+            Directory.CreateDirectory(fullExtractPath);
+
+            using (var zip = ZipFile.OpenRead(zipFilePath))
+            {
+                foreach (var entry in zip.Entries)
+                {
+                    // 跳过空条目
+                    if (string.IsNullOrEmpty(entry.FullName))
+                        continue;
+
+                    // 防止绝对路径和盘符前缀
+                    if (Path.IsPathRooted(entry.FullName))
+                        continue;
+
+                    // 统一路径分隔符
+                    var normalized = entry.FullName.Replace('/', Path.DirectorySeparatorChar);
+
+                    // 拒绝包含 .. 的路径，防止目录穿越
+                    if (normalized.Contains(".." + Path.DirectorySeparatorChar) ||
+                        normalized.StartsWith(".." + Path.DirectorySeparatorChar, StringComparison.Ordinal))
+                    {
+                        continue;
+                    }
+
+                    var destinationPath = Path.GetFullPath(
+                        Path.Combine(fullExtractPath, normalized));
+
+                    // 再次确认仍然在目标目录下
+                    if (!destinationPath.StartsWith(fullExtractPath, StringComparison.OrdinalIgnoreCase))
+                        continue;
+
+                    // 目录条目
+                    if (entry.FullName.EndsWith("/", StringComparison.Ordinal) ||
+                        entry.FullName.EndsWith("\\", StringComparison.Ordinal))
+                    {
+                        Directory.CreateDirectory(destinationPath);
+                        continue;
+                    }
+
+                    Directory.CreateDirectory(Path.GetDirectoryName(destinationPath) ?? fullExtractPath);
+
+                    if (!overwrite && File.Exists(destinationPath))
+                        continue;
+
+                    using (var input = entry.Open())
+                    using (var output = File.Create(destinationPath))
+                    {
+                        input.CopyTo(output);
+                    }
+                }
+            }
+        }
+    }
+}
+
+

Ink Canvas/Helpers/TimeMachine.cs

@@ -92,6 +92,11 @@ namespace Ink_Canvas.Helpers
 
         public TimeMachineHistory Undo()
         {
+            if (_currentIndex < 0 || _currentIndex >= _currentStrokeHistory.Count)
+            {
+                return null;
+            }
+
             var item = _currentStrokeHistory[_currentIndex];
             item.StrokeHasBeenCleared = !item.StrokeHasBeenCleared;
             _currentIndex--;
@@ -102,6 +107,11 @@ namespace Ink_Canvas.Helpers
 
         public TimeMachineHistory Redo()
         {
+            if (_currentStrokeHistory.Count == 0 || _currentIndex >= _currentStrokeHistory.Count - 1)
+            {
+                return null;
+            }
+
             var item = _currentStrokeHistory[++_currentIndex];
             item.StrokeHasBeenCleared = !item.StrokeHasBeenCleared;
             NotifyUndoRedoState();