void afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
void *map, const char **buf, size_t *len);
void afh_get_header(struct afh_info *afhi, void *map, const char **buf, size_t *len);
void afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
void *map, const char **buf, size_t *len);
void afh_get_header(struct afh_info *afhi, void *map, const char **buf, size_t *len);