unsigned chunk_used; /* Status of the chunk: used or unused */
unsigned obj_id; /* If 0 this is not used */
unsigned chunk_id; /* If 0 this is a header, else a data chunk */
unsigned chunk_used; /* Status of the chunk: used or unused */
unsigned obj_id; /* If 0 this is not used */
unsigned chunk_id; /* If 0 this is a header, else a data chunk */