add user database storage

simply added UserDB* source code and modified Makefile.
others are untouched.

UserDB.h

@@ -0,0 +1,43 @@
+/*
+ *   Copyright (C) 2020 by SASANO Takayoshi JG1UAA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(USERDB_H)
+#define USERDB_H
+
+#include "UserDBentry.h"
+#include "Mutex.h"
+
+class CUserDB {
+public:
+	CUserDB();
+	~CUserDB();
+
+	bool lookup(unsigned int id, class CUserDBentry *entry);
+	bool load(std::string const& filename);
+
+private:
+	bool makeindex(char* buf, std::unordered_map<std::string, int>& index);
+	void parse(char* buf, std::unordered_map<std::string, int>& index);
+	void toupper_string(char* str);
+	char* tokenize(char* str, char** next);
+
+	std::unordered_map<unsigned int, class CUserDBentry>    m_table;
+	CMutex                                                  m_mutex;
+};
+	
+#endif