hfs_header_record_t
hfs_header_record_t hr;
header_rec_size[0] = sizeof(hfs_header_record_t);
hfs_header_record_t* out_hr,
hfs_header_record_t chr; /* catalog file header node record*/
hfs_header_record_t ehr; /* extent overflow file header node record*/
hfs_header_record_t*, void*, void*);