added wpath overload for torrent_info constructor

docs/manual.rst

@@ -1222,6 +1222,7 @@ The ``torrent_info`` has the following synopsis::
 		torrent_info(lazy_entry const& torrent_file);
 		torrent_info(char const* buffer, int size);
 		torrent_info(boost::filesystem::path const& filename);
+		torrent_info(boost::filesystem::wpath const& filename);
 
 		void add_tracker(std::string const& url, int tier = 0);
 		std::vector<announce_entry> const& trackers() const;
@@ -1280,6 +1281,7 @@ torrent_info()
 		torrent_info(lazy_entry const& torrent_file);
 		torrent_info(char const* buffer, int size);
 		torrent_info(boost::filesystem::path const& filename);
+		torrent_info(boost::filesystem::wpath const& filename);
 
 The constructor that takes an info-hash  will initialize the info-hash to the given value,
 but leave all other fields empty. This is used internally when downloading torrents without

include/libtorrent/torrent_info.hpp

@@ -171,6 +171,7 @@ namespace libtorrent
 		torrent_info(lazy_entry const& torrent_file);
 		torrent_info(char const* buffer, int size);
 		torrent_info(fs::path const& filename);
+		torrent_info(fs::wpath const& filename);
 		~torrent_info();
 
 		file_storage const& files() const { return m_files; }

src/torrent_info.cpp

@@ -58,6 +58,7 @@ POSSIBILITY OF SUCH DAMAGE.
 #include "libtorrent/hasher.hpp"
 #include "libtorrent/entry.hpp"
 #include "libtorrent/file.hpp"
+#include "libtorrent/utf8.hpp"
 
 namespace gr = boost::gregorian;
 
@@ -359,6 +360,35 @@ namespace libtorrent
 #endif
 	}
 
+	torrent_info::torrent_info(fs::wpath const& filename)
+		: m_creation_date(pt::ptime(pt::not_a_date_time))
+		, m_multifile(false)
+		, m_private(false)
+	{
+		std::vector<char> buf;
+		std::string utf8;
+		wchar_utf8(filename.string(), utf8);
+		int ret = load_file(utf8, buf);
+		if (ret < 0) return;
+
+		if (buf.empty())
+#ifndef BOOST_NO_EXCEPTIONS
+			throw invalid_torrent_file();
+#else
+			return;
+#endif
+
+		lazy_entry e;
+		lazy_bdecode(&buf[0], &buf[0] + buf.size(), e);
+		std::string error;
+#ifndef BOOST_NO_EXCEPTIONS
+		if (!parse_torrent_file(e, error))
+			throw invalid_torrent_file();
+#else
+		parse_torrent_file(e, error);
+#endif
+	}
+
 	torrent_info::~torrent_info()
 	{}