Example #1
0
func LoadNeedleMap(file *os.File) *NeedleMap {
	nm := NewNeedleMap(file)
	bytes := make([]byte, 16*RowsToRead)
	count, e := nm.indexFile.Read(bytes)
	if count > 0 {
		fstat, _ := file.Stat()
		log.Println("Loading index file", fstat.Name(), "size", fstat.Size())
	}
	for count > 0 && e == nil {
		for i := 0; i < count; i += 16 {
			key := util.BytesToUint64(bytes[i : i+8])
			offset := util.BytesToUint32(bytes[i+8 : i+12])
			size := util.BytesToUint32(bytes[i+12 : i+16])
			if offset > 0 {
				nm.m.Set(Key(key), offset, size)
				//log.Println("reading key", key, "offset", offset, "size", size)
				nm.fileCounter++
			} else {
				nm.m.Delete(Key(key))
				//log.Println("removing key", key)
				nm.deletionCounter++
			}
		}

		count, e = nm.indexFile.Read(bytes)
	}
	return nm
}
Example #2
0
func ParseKeyHash(key_hash_string string) (uint64, uint32) {
	key_hash_bytes, khe := hex.DecodeString(key_hash_string)
	key_hash_len := len(key_hash_bytes)
	if khe != nil || key_hash_len <= 4 {
		println("Invalid key_hash", key_hash_string, "length:", key_hash_len, "error", khe)
		return 0, 0
	}
	key := util.BytesToUint64(key_hash_bytes[0 : key_hash_len-4])
	hash := util.BytesToUint32(key_hash_bytes[key_hash_len-4 : key_hash_len])
	return key, hash
}
Example #3
0
func (n *Needle) Read(r io.Reader, size uint32) (int, error) {
	bytes := make([]byte, size+16+4)
	ret, e := r.Read(bytes)
	n.Cookie = util.BytesToUint32(bytes[0:4])
	n.Id = util.BytesToUint64(bytes[4:12])
	n.Size = util.BytesToUint32(bytes[12:16])
	n.Data = bytes[16 : 16+size]
	checksum := util.BytesToUint32(bytes[16+size : 16+size+4])
	if checksum != NewCRC(n.Data).Value() {
		return 0, errors.New("CRC error! Data On Disk Corrupted!")
	}
	return ret, e
}
Example #4
0
func ReadNeedle(r *os.File) (*Needle, uint32) {
	n := new(Needle)
	bytes := make([]byte, 16)
	count, e := r.Read(bytes)
	if count <= 0 || e != nil {
		return nil, 0
	}
	n.Cookie = util.BytesToUint32(bytes[0:4])
	n.Id = util.BytesToUint64(bytes[4:12])
	n.Size = util.BytesToUint32(bytes[12:16])
	rest := 8 - ((n.Size + 16 + 4) % 8)
	return n, n.Size + 4 + rest
}