byte_bpb50
const struct byte_bpb50* b50 = reinterpret_cast<const byte_bpb50*>(bootsector->bs50.bsBPB);
fix_zip(const byte_bpb50* bpb, msdosfsmount* volume)
void fix_zip(const byte_bpb50* bpb, msdosfsmount* volume);