alpha

2025-08-23 21:39:21 +08:00
parent 7bac32e3c4
commit f67b4db4ba
562 changed files with 37981 additions and 38280 deletions
@@ -0,0 +1,68 @@
+using Microsoft.Win32.SafeHandles;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Ink_Canvas.Helpers {
+    public static class DirectoryUtils
+    {
+        [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
+        private static extern SafeFileHandle CreateFile(
+            string fileName,
+            uint dwDesiredAccess,
+            FileShare dwShareMode,
+            IntPtr securityAttrs_MustBeZero,
+            FileMode dwCreationDisposition,
+            uint dwFlagsAndAttributes,
+            IntPtr hTemplateFile_MustBeZero);
+
+        [DllImport("kernel32.dll", SetLastError = true, EntryPoint = "SetFileTime", ExactSpelling = true)]
+        private static extern bool SetFileTime(
+            SafeFileHandle hFile,
+            IntPtr lpCreationTimeUnused,
+            IntPtr lpLastAccessTimeUnused,
+            ref long lpLastWriteTime);
+
+        private const uint FILE_ACCESS_GENERIC_READ = 0x80000000;
+        private const uint FILE_ACCESS_GENERIC_WRITE = 0x40000000;
+
+        private const int FILE_FLAG_BACKUP_SEMANTICS = 0x02000000;
+        private const int OPEN_EXISTING = 3;
+
+        public static bool SetDirectoryLastWriteUtc(string dirPath, DateTime lastWriteDate) {
+            using (var hDir = CreateFile(dirPath, FILE_ACCESS_GENERIC_READ | FILE_ACCESS_GENERIC_WRITE,
+                FileShare.ReadWrite, IntPtr.Zero, (FileMode) OPEN_EXISTING,
+                FILE_FLAG_BACKUP_SEMANTICS, IntPtr.Zero)) {
+                var lastWriteTime = lastWriteDate.ToFileTime();
+                if (!SetFileTime(hDir, IntPtr.Zero, IntPtr.Zero, ref lastWriteTime)) {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        public static bool IsWritable(string dirPath) {
+            try {
+                var lastWriteDate = Directory.GetLastWriteTimeUtc(dirPath);
+                using (File.Create(Path.Combine(dirPath, Path.GetRandomFileName()), 1, FileOptions.DeleteOnClose)) { }
+
+                try {
+                    SetDirectoryLastWriteUtc(dirPath, lastWriteDate);
+                } catch { }
+
+                return true;
+            } catch (UnauthorizedAccessException) { } catch (Exception) { }
+            return false;
+        }
+
+        public static async Task<bool> IsWritableAsync(string dirPath) {
+            var fn = new DirectoryInfo(dirPath).FullName;
+            var result = await Task.Run(() => IsWritable(dirPath));
+            return result;
+        }
+    }
+}