func query(db storage.Engine, s int64, yield func(storage.Iterator)) {
sb := bytes.NewBuffer(nil)
binary.Write(sb, binary.BigEndian, s)
binary.Write(sb, binary.BigEndian, int64(0))
binary.Write(sb, binary.BigEndian, int64(0))
eb := bytes.NewBuffer(nil)
binary.Write(eb, binary.BigEndian, s)
binary.Write(eb, binary.BigEndian, int64(-1))
binary.Write(eb, binary.BigEndian, int64(-1))
itr := db.Iterator()
defer itr.Close()
count := 0
for itr.Seek(sb.Bytes()); itr.Valid(); itr.Next() {
key := itr.Key()
if bytes.Compare(key, eb.Bytes()) > 0 {
break
}
count++
yield(itr)
}
}
