typedef void (*VikLayerFuncCopyItem) (VikLayer *, gint, gpointer, guint8 **, guint *);
/* layer, subtype, pointer to sub-item, return pointer, return len */
typedef gboolean (*VikLayerFuncPasteItem) (VikLayer *, gint, guint8 *, guint);
typedef void (*VikLayerFuncCopyItem) (VikLayer *, gint, gpointer, guint8 **, guint *);
/* layer, subtype, pointer to sub-item, return pointer, return len */
typedef gboolean (*VikLayerFuncPasteItem) (VikLayer *, gint, guint8 *, guint);