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package storage
import (
"crypto/md5"
"fmt"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/klauspost/crc32"
)
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))
}
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