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package murmur3
import (
"hash"
)
// Make sure interfaces are correctly implemented.
var (
_ hash.Hash = new(digest64)
_ hash.Hash64 = new(digest64)
_ bmixer = new(digest64)
)
// digest64 is half a digest128.
type digest64 digest128
func New64() hash.Hash64 {
d := (*digest64)(New128().(*digest128))
return d
}
func (d *digest64) Sum(b []byte) []byte {
h1 := d.h1
return append(b,
byte(h1>>56), byte(h1>>48), byte(h1>>40), byte(h1>>32),
byte(h1>>24), byte(h1>>16), byte(h1>>8), byte(h1))
}
func (d *digest64) Sum64() uint64 {
h1, _ := (*digest128)(d).Sum128()
return h1
}
// Sum64 returns the MurmurHash3 sum of data. It is equivalent to the
// following sequence (without the extra burden and the extra allocation):
// hasher := New64()
// hasher.Write(data)
// return hasher.Sum64()
func Sum64(data []byte) uint64 {
d := &digest128{h1: 1, h2: 1}
d.tail = d.bmix(data)
d.clen = len(data)
h1, _ := d.Sum128()
return h1
}
|