-void transferputdata(struct transfer *transfer, void *buf, size_t size);
-size_t transferdatasize(struct transfer *transfer);
-void transferendofdata(struct transfer *transfer);
-void transferprepul(struct transfer *transfer, size_t size, size_t start, size_t end, struct socket *lesk);
+void transferprepul(struct transfer *transfer, off_t size, off_t start, off_t end, struct socket *lesk);