+extern size_t utf8_strlen (std::string s);
+extern std::string day_of_week_to_string (boost::gregorian::greg_weekday d);
+extern void emit_subtitle_image (dcpomatic::ContentTimePeriod period, dcp::SubtitleImage sub, dcp::Size size, std::shared_ptr<TextDecoder> decoder);
+extern bool show_jobs_on_console (bool progress);
+extern void copy_in_bits (boost::filesystem::path from, boost::filesystem::path to, boost::function<void (float)>);
+extern dcp::Size scale_for_display (dcp::Size s, dcp::Size display_container, dcp::Size film_container);
+extern dcp::DecryptedKDM decrypt_kdm_with_helpful_error (dcp::EncryptedKDM kdm);
+extern boost::filesystem::path default_font_file ();
+
+template <class T>
+std::list<T>
+vector_to_list (std::vector<T> v)
+{
+ std::list<T> l;
+ for (auto& i: v) {
+ l.push_back (i);
+ }
+ return l;
+}
+
+template <class T>
+std::vector<T>
+list_to_vector (std::list<T> v)
+{
+ std::vector<T> l;
+ for (auto& i: v) {
+ l.push_back (i);
+ }
+ return l;
+}
+
+extern double db_to_linear (double db);
+extern double linear_to_db (double linear);