// SortEntries sorts entries from c in memory and write to w in
// slightly over the maxSize bytes. Returns number of entries written
// and error.
func SortEntries(c sstable.Cursor, maxSize uint64, w *sstable.Writer) (n int, err error) {
es := Entries{}
size := uint64(0)
for !c.Done() && size < maxSize {
e := c.Entry()
c.Next()
size += e.Size()
es = append(es, HeapEntry{*e, nil})
}
heap.Init(&es)
for es.Len() > 0 {
e := heap.Pop(&es)
err = w.Write(e.(HeapEntry).Entry)
if err != nil {
return
}
n += 1
}
err = w.Close()
return
}
