+public:
+ enum State
+ {
+ INITIAL,
+ HEADERS_LOADED,
+ FINISHED
+ };
+
+protected:
+ class RegisterBase
+ {
+ protected:
+ RegisterBase() { }
+ public:
+ virtual ~RegisterBase() { }
+
+ virtual unsigned get_signature_size() const = 0;
+ virtual bool detect(const std::string &) const = 0;
+ virtual ImageLoader *create(IO::Seekable &) const = 0;
+ };
+
+ template<typename T>
+ class RegisteredLoader: public RegisterBase
+ {
+ public:
+ virtual unsigned get_signature_size() const { return T::get_signature_size(); }
+ virtual bool detect(const std::string &s) const { return T::detect(s); }
+ virtual ImageLoader *create(IO::Seekable &io) const { return new T(io); }
+ };
+
+ struct Registry
+ {
+ std::list<RegisterBase *> loaders;
+ bool changed;
+
+ Registry();
+ ~Registry();
+ };
+