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+/*
+ Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+ 2011, 2012 Her Majesty the Queen in Right of Canada (Communications
+ Research Center Canada)
+
+ Copyright (C) 2016
+ Matthias P. Braendli, matthias.braendli@mpb.li
+
+ http://www.opendigitalradio.org
+ */
+/*
+ This file is part of ODR-DabMux.
+
+ ODR-DabMux 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 3 of the
+ License, or (at your option) any later version.
+
+ ODR-DabMux 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 ODR-DabMux. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* The EDI output needs TAI clock, according to ETSI TS 102 693 Annex F
+ * "EDI Timestamps". This module sets the local CLOCK_TAI clock by
+ * setting the TAI-UTC offset using adjtimex.
+ *
+ * This functionality requires Linux 3.10 (30 Jun 2013) or newer */
+
+#ifndef __CLOCK_TAI_H_
+#define __CLOCK_TAI_H_
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <sstream>
+#include <time.h>
+
+// EDI needs to know UTC-TAI, but doesn't need the CLOCK_TAI to be set
+#define SUPPORT_SETTING_CLOCK_TAI 0
+
+/* Loads, parses and represents TAI-UTC offset information from the USNO bulletin */
+class ClockTAI {
+ public:
+ ClockTAI();
+
+ // Fetch the bulletin from the USNO website and return the current
+ // TAI-UTC offset.
+ // Throws runtime_error on failure.
+ int get_offset(void);
+
+#if SUPPORT_SETTING_CLOCK_TAI
+ // Update the local TAI clock according to the TAI-UTC offset
+ // return 0 on success
+ int update_local_tai_clock(int offset);
+#endif
+
+ private:
+ // leap seconds insertion bulletin is available at
+ const char* tai_data_url1 = "http://maia.usno.navy.mil/ser7/tai-utc.dat";
+ const char* tai_data_url2 = "http://toshi.nofs.navy.mil/ser7/tai-utc.dat";
+
+ int m_offset;
+ std::stringstream m_bulletin;
+ struct timespec m_bulletin_download_time;
+
+ // Load bulletin into m_bulletin, return 0 on success
+ int download_tai_utc_bulletin(const char* url);
+
+ // read TAI offset from m_bulletin
+ int parse_tai_offset(void);
+
+ // callback that receives data from cURL
+ size_t fill_bulletin(char *ptr, size_t size, size_t nmemb);
+
+ // static callback wrapper for cURL
+ static size_t fill_bulletin_cb(
+ char *ptr, size_t size, size_t nmemb, void *ctx);
+};
+
+#endif // __CLOCK_TAI_H_
+