Continue C++ rewrite.

file_io.h

@@ -0,0 +1,29 @@
+#ifndef FILE_IO_HPP
+#define FILE_IO_HPP
+
+// Forward declaration
+struct editor_t;
+
+namespace ke {
+
+/**
+ * File I/O class for reading and writing files.
+ */
+class FileIO {
+public:
+    FileIO() = default;
+    ~FileIO() = default;
+    
+    // Deleted copy constructor and assignment
+    FileIO(const FileIO&) = delete;
+    FileIO& operator=(const FileIO&) = delete;
+    
+    // File operations
+    static void open_file(editor_t* editor, const char* filename);
+    static int save_file(editor_t* editor);
+    static char* rows_to_buffer(editor_t* editor, int* buflen);
+};
+
+} // namespace ke
+
+#endif // FILE_IO_HPP