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diff --git a/libnitrokey-v3.4/libnitrokey/log.h b/libnitrokey-v3.4/libnitrokey/log.h
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+/*
+ * Copyright (c) 2015-2018 Nitrokey UG
+ *
+ * This file is part of libnitrokey.
+ *
+ * libnitrokey is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
+ *
+ * libnitrokey 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 Lesser General Public License
+ * along with libnitrokey. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: LGPL-3.0
+ */
+
+#ifndef LOG_H
+#define LOG_H
+
+#include <string>
+#include <functional>
+
+namespace nitrokey {
+ namespace log {
+
+//for MSVC
+#ifdef ERROR
+#undef ERROR
+#endif
+
+
+ enum class Loglevel : int {
+ ERROR,
+ WARNING,
+ INFO,
+ DEBUG_L1,
+ DEBUG,
+ DEBUG_L2
+ };
+
+ class LogHandler {
+ public:
+ virtual void print(const std::string &, Loglevel lvl) = 0;
+ protected:
+ std::string loglevel_to_str(Loglevel);
+ std::string format_message_to_string(const std::string &str, const Loglevel &lvl);
+
+ };
+
+ class StdlogHandler : public LogHandler {
+ public:
+ virtual void print(const std::string &, Loglevel lvl);
+ };
+
+ class FunctionalLogHandler : public LogHandler {
+ using log_function_type = std::function<void(std::string)>;
+ log_function_type log_function;
+ public:
+ FunctionalLogHandler(log_function_type _log_function);
+ virtual void print(const std::string &, Loglevel lvl);
+
+ };
+
+ extern StdlogHandler stdlog_handler;
+
+ class Log {
+ public:
+ Log() : mp_loghandler(&stdlog_handler), m_loglevel(Loglevel::WARNING) {}
+
+ static Log &instance() {
+ if (mp_instance == nullptr) mp_instance = new Log;
+ return *mp_instance;
+ }
+
+ void operator()(const std::string &, Loglevel);
+ void set_loglevel(Loglevel lvl) { m_loglevel = lvl; }
+ void set_handler(LogHandler *handler) { mp_loghandler = handler; }
+
+ private:
+ LogHandler *mp_loghandler;
+ Loglevel m_loglevel;
+ static std::string prefix;
+ public:
+ static void setPrefix(std::string prefix = std::string());
+
+ private:
+
+ static Log *mp_instance;
+ };
+ }
+}
+
+
+#ifdef NO_LOG
+#define LOG(string, level) while(false){}
+#define LOGD(string) while(false){}
+#else
+#define LOG(string, level) nitrokey::log::Log::instance()((string), (level))
+#define LOGD1(string) nitrokey::log::Log::instance()((string), (nitrokey::log::Loglevel::DEBUG_L1))
+#define LOGD(string) nitrokey::log::Log::instance()((string), (nitrokey::log::Loglevel::DEBUG_L2))
+#endif
+
+#endif