Add all the files

src/config/PermanentConfig.cpp

@@ -0,0 +1,65 @@
+#include "PermanentConfig.h"
+
+#include "pugixml.hpp"
+
+#include "PermanentStorage.h"
+
+struct xml_string_writer : pugi::xml_writer
+{
+	std::string result;
+
+	void write(const void* data, size_t size) override
+	{
+		result.append(static_cast<const char*>(data), size);
+	}
+};
+
+std::string PermanentConfig::ToXMLString() const noexcept
+{
+	pugi::xml_document doc;
+	doc.append_child(pugi::node_declaration).append_attribute("encoding") = "UTF-8";
+	auto root = doc.append_child("config");
+	root.append_child("MlcPath").text().set(this->custom_mlc_path.c_str());
+
+	xml_string_writer writer;
+	doc.save(writer);
+	return writer.result;
+}
+
+PermanentConfig PermanentConfig::FromXMLString(std::string_view str) noexcept
+{
+	PermanentConfig result{};
+
+	pugi::xml_document doc;
+	if(doc.load_buffer(str.data(), str.size()))
+	{
+		result.custom_mlc_path = doc.select_node("/config/MlcPath").node().text().as_string();
+	}
+
+	return result;
+}
+
+PermanentConfig PermanentConfig::Load()
+{
+	PermanentStorage storage;
+
+	const auto str = storage.ReadFile(kFileName);
+	if (!str.empty())
+		return FromXMLString(str);
+
+	return {};
+}
+
+bool PermanentConfig::Store() noexcept
+{
+	try
+	{
+		PermanentStorage storage;
+		storage.WriteStringToFile(kFileName, ToXMLString());
+	}
+	catch (...)
+	{
+		return false;
+	}
+	return true;
+}