Add read_url_list() functions

src/ducktorrent/c_api_torrent_read.cpp

@@ -48,6 +48,27 @@ struct dt_torrent* dt_make_reader_from_path (dt_string path) {
 	}
 }
 
+namespace {
+//Just a convenience wrapper because I found I was copy-pasting code to fetch
+//arrays from TorrentRead just because each C function would call into a
+//different method. So here I take the method as a template parameter and no
+//more copy-paste
+dt_string_list read_string_list (struct dt_torrent* t, auto method, auto&&... args) {
+	try {
+		auto vec = (t->reader.*method)(std::forward<decltype(args)>(args)...);
+		t->vec_buff.clear();
+		t->vec_buff.reserve(vec.size());
+		for (std::string_view s : vec) {
+			t->vec_buff.emplace_back(s.data(), s.size());
+		}
+		return {t->vec_buff.data(), t->vec_buff.size()};
+	}
+	catch (...) {
+		return {nullptr, 0};
+	}
+}
+} //unnamed namespace
+
 extern "C"
 void dt_free_torrent_read (struct dt_torrent* t) {
 	delete t;
@@ -84,18 +105,12 @@ int_fast32_t dt_read_file_count(struct dt_torrent* t) {
 
 extern "C"
 dt_string_list dt_read_file_path(struct dt_torrent* t, size_t index) {
-	try {
-		auto vec = t->reader.read_file_path(index);
-		t->vec_buff.clear();
-		t->vec_buff.reserve(vec.size());
-		for (std::string_view s : vec) {
-			t->vec_buff.emplace_back(s.data(), s.size());
-		}
-		return {t->vec_buff.data(), t->vec_buff.size()};
-	}
-	catch (...) {
-		return {nullptr, 0};
-	}
+	return read_string_list(t, &duck::TorrentRead::read_file_path, index);
+}
+
+extern "C"
+dt_string_list dt_read_url_list(struct dt_torrent* t) {
+	return read_string_list(t, &duck::TorrentRead::read_url_list);
 }
 
 extern "C"

src/ducktorrent/include/ducktorrent/torrent_read.h

@@ -69,6 +69,7 @@ void dt_print_to_stdout(struct dt_torrent*);
 size_t dt_read_piece_length(struct dt_torrent*);
 int_fast32_t dt_read_file_count(struct dt_torrent*);
 dt_string_list dt_read_file_path(struct dt_torrent*, size_t index);
+dt_string_list dt_read_url_list(struct dt_torrent*);
 dt_string dt_read_joint_file_path(struct dt_torrent*, size_t index, char sep);
 size_t dt_read_file_size(struct dt_torrent*, size_t index);
 int dt_read_is_private(struct dt_torrent*);

src/ducktorrent/include/ducktorrent/torrent_read.hpp

@@ -48,6 +48,7 @@ public:
 	std::size_t read_piece_length() const;
 	std::int_fast32_t read_file_count() const;
 	std::vector<std::string_view> read_file_path(std::size_t index) const;
+	std::vector<std::string_view> read_url_list() const;
 	std::string read_joint_file_path(std::size_t index, char sep) const;
 	std::size_t read_file_size(std::size_t index) const;
 	bool read_is_private() const;

src/ducktorrent/torrent_read.cpp

@@ -179,6 +179,14 @@ std::vector<std::string_view> TorrentRead::read_file_path(std::size_t index) con
 	return grab_all_strings_in_list(*path_variant);
 }
 
+std::vector<std::string_view> TorrentRead::read_url_list() const {
+	auto found = find_variant("/url-list", m_parsed_values);
+	if (not found)
+		return {};
+
+	return grab_all_strings_in_list(*found);
+}
+
 std::string TorrentRead::read_joint_file_path(std::size_t index, char sep) const {
 	auto pieces = this->read_file_path(index);
 	const std::size_t out_size = std::accumulate(pieces.cbegin(), pieces.cend(), 0u,