src/lib/kdm_util.cc

   1 /*
   2     Copyright (C) 2023 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21
  22 #include "kdm_util.h"
  23 #include "screen.h"
  24 #include <dcp/certificate.h>
  25 #include <boost/optional.hpp>
  26
  27 #include "i18n.h"
  28
  29
  30 using std::list;
  31 using std::pair;
  32 using std::shared_ptr;
  33 using std::string;
  34 using boost::optional;
  35
  36
  37 KDMCertificatePeriod
  38 check_kdm_and_certificate_validity_periods(dcp::Certificate const& recipient, dcp::LocalTime kdm_from, dcp::LocalTime kdm_to)
  39 {
  40         auto overlaps = [](dcp::LocalTime from_a, dcp::LocalTime to_a, dcp::LocalTime from_b, dcp::LocalTime to_b) {
  41                 return std::max(from_a, from_b) < std::min(to_a, to_b);
  42         };
  43
  44         auto contains = [](dcp::LocalTime bigger_from, dcp::LocalTime bigger_to, dcp::LocalTime smaller_from, dcp::LocalTime smaller_to) {
  45                 return bigger_from <= smaller_from && bigger_to >= smaller_to;
  46         };
  47
  48         if (contains(recipient.not_before(), recipient.not_after(), kdm_from, kdm_to)) {
  49                 return KDMCertificatePeriod::KDM_WITHIN_CERTIFICATE;
  50         }
  51
  52         if (overlaps(recipient.not_before(), recipient.not_after(), kdm_from, kdm_to)) {
  53                 /* The KDM overlaps the certificate validity: maybe not the end of the world */
  54                 return KDMCertificatePeriod::KDM_OVERLAPS_CERTIFICATE;
  55         } else {
  56                 /* The KDM validity is totally outside the certificate validity: bad news */
  57                 return KDMCertificatePeriod::KDM_OUTSIDE_CERTIFICATE;
  58         }
  59 }
  60