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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
// SeedNew64 returns a hash.Hash64 for streaming 64 bit sums. As the canonical
// implementation does not support Sum64, this uses SeedNew128(seed, seed)
func SeedNew64(seed uint64) hash.Hash64 {
return (*digest64)(SeedNew128(seed, seed).(*digest128))
}
// New64 returns a hash.Hash64 for streaming 64 bit sums.
func New64() hash.Hash64 {
return SeedNew64(0)
}
func (d *digest64) Sum(b []byte) []byte {
h1 := d.Sum64()
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 murmur3 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 {
h1, _ := Sum128(data)
return h1
}
// SeedSum64 returns the murmur3 sum of data with the digest initialized to
// seed.
//
// Because the canonical implementation does not support SeedSum64, this uses
// SeedSum128(seed, seed, data).
func SeedSum64(seed uint64, data []byte) uint64 {
h1, _ := SeedSum128(seed, seed, data)
return h1
}
// StringSum64 is the string version of Sum64.
func StringSum64(data string) uint64 {
h1, _ := StringSum128(data)
return h1
}
// SeedStringSum64 is the string version of SeedSum64.
func SeedStringSum64(seed uint64, data string) uint64 {
h1, _ := SeedStringSum128(seed, seed, data)
return h1
}
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