Add VFS

pkNX.Containers/VFS/FileSystems/IFileSystem.cs

@@ -0,0 +1,44 @@
+using System.IO;
+using System.Collections.Generic;
+using System;
+
+namespace pkNX.Containers.VFS;
+
+public interface IFileSystem : IDisposable
+{
+    IEnumerable<FileSystemPath> GetEntities(FileSystemPath path);
+    bool Exists(FileSystemPath path);
+    Stream CreateFile(FileSystemPath path);
+    Stream OpenFile(FileSystemPath path, FileAccess access);
+    void CreateDirectory(FileSystemPath path);
+    void Delete(FileSystemPath path);
+
+    bool IsReadOnly => false;
+
+    public string ReadAllText(FileSystemPath path)
+    {
+        if (!Exists(path))
+            return string.Empty;
+
+        using var stream = OpenFile(path, FileAccess.Read);
+        using var reader = new StreamReader(stream);
+        return reader.ReadToEnd();
+    }
+
+    public void WriteAllText(FileSystemPath path, string content)
+    {
+        if (!Exists(path))
+        {
+            CreateFile(path);
+        }
+
+        using var stream = OpenFile(path, FileAccess.Write);
+        using var writer = new StreamWriter(stream);
+        writer.Write(content);
+    }
+}
+
+public static class IFileSystemExtensions
+{
+    public static ReadOnlyFileSystem AsReadOnlyFileSystem(this IFileSystem self) => new(self);
+}