extern GRFConfig *_all_grfs;          ///< First item in list of all scanned NewGRFs

extern GRFConfig *_grfconfig;         ///< First item in list of current GRF set up

extern GRFConfig *_grfconfig_newgame; ///< First item in list of default GRF set up

extern GRFConfig *_grfconfig_static;  ///< First item in list of static GRF set up

void ScanNewGRFFiles();

const GRFConfig *FindGRFConfig(uint32 grfid, const uint8 *md5sum = NULL);

GRFConfig *GetGRFConfig(uint32 grfid, uint32 mask = 0xFFFFFFFF);

GRFConfig **CopyGRFConfigList(GRFConfig **dst, const GRFConfig *src, bool init_only);

void AppendStaticGRFConfigs(GRFConfig **dst);

void AppendToGRFConfigList(GRFConfig **dst, GRFConfig *el);

void ClearGRFConfigList(GRFConfig **config);