int PageDirectory::nextRecord(FileHandle &fh, RID &rid){
char buffer[PAGE_SIZE];
int pgid = rid.pageNum, slotid = -1;
RecordPage rp;
if (rid.pageNum != 0) {
fh.readPage(rid.pageNum, buffer);
rp = RecordPage(buffer);
if ((slotid = rp.nextRecord(rid.slotNum)) != -1) { // - 1 is current. + 0 is next
rid.slotNum = slotid;
return 0;
}
}
while (1) {
if ((pgid = nextRecordPageID(fh, pgid)) == -1)
return -1;
fh.readPage(pgid, buffer);
rp= RecordPage(buffer);
if ((slotid = rp.nextRecord(0)) != -1) {
rid.pageNum = pgid;
rid.slotNum = slotid;
return 0;
}
}
return -1;
}
int PageDirectory::moveToNext(FileHandle &fh){
assert(get_next() != 0);
assert(get_pgnum() == PageDirectory::MaximunEntryNum());
fh.writePage(in_the_page, data);
in_the_page = get_next();
fh.readPage(in_the_page, data);
return in_the_page;
}
