Added hex to Object and string_utf8.

src/utils/base64.h

@@ -1,12 +1,18 @@
 #ifndef RTORRENT_UTILS_BASE64_H
 #define RTORRENT_UTILS_BASE64_H
 
+#include <optional>
 #include <string>
-
+#include <vector>
 #include <torrent/exceptions.h>
 
 namespace utils {
 
+// TODO: Refactor and move to torrent/string_manip.h.
+std::optional<std::vector<uint8_t>> base64_to_vector_unsafe(const std::string& src);
+std::string                         openssl_base64_encode(const std::string& src);
+
+// TODO: Deprecate.
 std::string remove_newlines(const std::string& str);
 std::string decode_base64(const std::string& input);