+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 (ContentTimePeriod period, dcp::SubtitleImage sub, dcp::Size size, boost::shared_ptr<TextDecoder> decoder);
+#ifdef DCPOMATIC_VARIANT_SWAROOP
+extern boost::shared_ptr<dcp::CertificateChain> read_swaroop_chain (boost::filesystem::path path);
+extern void write_swaroop_chain (boost::shared_ptr<const dcp::CertificateChain> chain, boost::filesystem::path output);
+#endif
+
+template <class T>
+std::list<T>
+vector_to_list (std::vector<T> v)
+{
+ std::list<T> l;
+ BOOST_FOREACH (T& i, v) {
+ l.push_back (i);
+ }
+ return l;
+}