class ImageLoader
{
private:
- IO::Base *source;
+ 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;
+ };
+
protected:
+ template<typename T>
+ class Register: 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 T *create(IO::Seekable &io) const { return new T(io); }
+ };
+
+private:
+ IO::Base *source;
+ static std::list<RegisterBase *> &get_registered_loaders();
+ static bool registered_loaders_changed;
+ static bool signature_size_compare(RegisterBase *, RegisterBase *);
+
+protected:
ImageLoader();
public:
virtual ~ImageLoader();