mirror of
https://github.com/chrislusf/seaweedfs
synced 2024-06-01 16:22:43 +02:00
42 lines
661 B
Go
42 lines
661 B
Go
package needle
|
|
|
|
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))
|
|
|
|
}
|