surf_action_t(*close) (void *workstation, const char* storage, surf_file_t fp);
surf_action_t(*read) (void *workstation, const char* storage, void* ptr, size_t size, size_t nmemb, surf_file_t stream);
surf_action_t(*write) (void *workstation, const char* storage, const void* ptr, size_t size, size_t nmemb, surf_file_t stream);
surf_action_t(*close) (void *workstation, const char* storage, surf_file_t fp);
surf_action_t(*read) (void *workstation, const char* storage, void* ptr, size_t size, size_t nmemb, surf_file_t stream);
surf_action_t(*write) (void *workstation, const char* storage, const void* ptr, size_t size, size_t nmemb, surf_file_t stream);