mirror of
https://github.com/taigrr/colorhash.git
synced 2026-04-01 18:58:45 -07:00
37 lines
609 B
Go
37 lines
609 B
Go
package go_colorhash
|
|
|
|
import (
|
|
"crypto/md5"
|
|
"encoding/binary"
|
|
"hash/fnv"
|
|
"io"
|
|
)
|
|
|
|
const MaxUint = ^uint(0)
|
|
const MaxInt = int(MaxUint >> 1)
|
|
|
|
func HashString(s string) int {
|
|
h := fnv.New64()
|
|
io.WriteString(h, s)
|
|
hashb := h.Sum(nil)
|
|
hashb = hashb[len(hashb)-8:]
|
|
lsb := binary.BigEndian.Uint64(hashb)
|
|
sint := int(lsb)
|
|
if sint < 0 {
|
|
sint = sint + MaxInt
|
|
}
|
|
return sint
|
|
}
|
|
func HashBytes(r io.Reader) int {
|
|
h := md5.New()
|
|
io.Copy(h, r)
|
|
hashb := h.Sum(nil)
|
|
hashb = hashb[len(hashb)-8:]
|
|
lsb := binary.BigEndian.Uint64(hashb)
|
|
sint := int(lsb)
|
|
if sint < 0 {
|
|
sint = sint + MaxInt
|
|
}
|
|
return sint
|
|
}
|