libshared: Factored out driver settings class from net_server.

* The new class is called DriverSettingsMessageAdapter which can translate
  between a driver_settings file, and a BMessage.
* The net_server Settings class is now just using this class.

headers/private/shared/DriverSettingsMessageAdapter.h

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2006-2013, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Axel Dörfler, [email protected]
+ *		Michael Lotz <[email protected]>
+ */
+#ifndef DRIVER_SETTINGS_MESSAGE_ADAPTER_H
+#define DRIVER_SETTINGS_MESSAGE_ADAPTER_H
+
+
+#include <driver_settings.h>
+#include <Message.h>
+
+
+struct settings_template {
+	uint32		type;
+	const char*	name;
+	const settings_template* sub_template;
+	bool		parent_value;
+};
+
+
+class DriverSettingsMessageAdapter {
+public:
+								DriverSettingsMessageAdapter();
+								~DriverSettingsMessageAdapter();
+
+			status_t			ConvertFromDriverSettings(
+									const driver_settings& settings,
+									const settings_template* settingsTemplate,
+									BMessage& message);
+			status_t			ConvertFromDriverSettings(const char* path,
+									const settings_template* settingsTemplate,
+									BMessage& message);
+
+			status_t			ConvertToDriverSettings(
+									const settings_template* settingsTemplate,
+									BString& settings, const BMessage& message);
+			status_t			ConvertToDriverSettings(const char* path,
+									const settings_template* settingsTemplate,
+									const BMessage& message);
+
+private:
+			const settings_template* _FindSettingsTemplate(
+									const settings_template* settingsTemplate,
+									const char* name);
+			const settings_template* _FindParentValueTemplate(
+									const settings_template* settingsTemplate);
+			status_t			_AddParameter(const driver_parameter& parameter,
+									const char* name, uint32 type,
+									BMessage& message);
+
+			status_t			_ConvertFromDriverParameter(
+									const driver_parameter& parameter,
+									const settings_template* settingsTemplate,
+									BMessage& message);
+
+			status_t			_AppendSettings(
+									const settings_template* settingsTemplate,
+									BString& settings, const BMessage& message,
+									const char* name, type_code type,
+									int32 count,
+									const char* settingName = NULL);
+
+};
+
+
+#endif	// DRIVER_SETTINGS_MESSAGE_ADAPTER_H