move save and load buffer to file in to buffer class

Password_manager/include/Buffer.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <cstdint>
+#include <string>
 
 class Buffer
 {
@@ -7,6 +8,7 @@ public:
 	uint8_t* buffer = nullptr;
 	size_t taken = 0;
 	size_t size = 0;
+	std::string file_path;
 
 	Buffer(size_t size);
 	Buffer();
@@ -26,4 +28,10 @@ public:
 
 	void clear() { taken = 0; }
 
+	bool save_to_file();
+	bool save_to_file(std::string file_path);
+
+	bool load_from_file();
+	bool load_from_file(std::string file_path);
+
 };

Password_manager/include/func.h

@@ -1,5 +1,5 @@
 #pragma once
-#include <fstream>
+#include <string>
 
 class Buffer;
 
@@ -31,7 +31,3 @@ LoginInfoPointer get_logininfo_pointer_from_buffer(Buffer& buffer, int index_of_
 
 void generate_password(std::string& password, int len);
 
-bool save_buffer_to_file(Buffer& buffer);
-
-bool load_buffer_from_file(Buffer& buffer);
-