package storage import ( "fmt" "crypto/md5" "github.com/klauspost/crc32" "github.com/chrislusf/seaweedfs/weed/util" ) var table = crc32.MakeTable(crc32.Castagnoli) type CRC uint32 func NewCRC(b []byte) CRC { return CRC(0).Update(b) } func (c CRC) Update(b []byte) CRC { return CRC(crc32.Update(uint32(c), table, b)) } func (c CRC) Value() uint32 { return uint32(c>>15|c<<17) + 0xa282ead8 } func (n *Needle) Etag() string { bits := make([]byte, 4) util.Uint32toBytes(bits, uint32(n.Checksum)) return fmt.Sprintf("%x", bits) } func (n *Needle) MD5() string { hash := md5.New() hash.Write(n.Data) return fmt.Sprintf("%x", hash.Sum(nil)) }