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Add Digest.Copy() method #84

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Add Digest.Copy() method #84

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7 changes: 7 additions & 0 deletions xxhash.go
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Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,13 @@ func (d *Digest) ResetWithSeed(seed uint64) {
d.n = 0
}

// Copy returns a copy of the Digest.
func (d *Digest) Copy() *Digest {
digest := *d
copy(digest.mem[:], d.mem[:])
return &digest
}

// Size always returns 8 bytes.
func (d *Digest) Size() int { return 8 }

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17 changes: 17 additions & 0 deletions xxhash_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -190,6 +190,23 @@ func TestAllocs(t *testing.T) {
})
}

func TestCopy(t *testing.T) {
want := Sum64String("abcdef")

d0 := New()
d0.WriteString("abc")
d1 := d0.Copy()
d0.WriteString("def")
d1.WriteString("def")

if got := d0.Sum64(); got != want {
t.Fatalf("hashing with original Digest, got 0x%x; want 0x%x", got, want)
}
if got := d1.Sum64(); got != want {
t.Fatalf("hashing with copied Digest, got 0x%x; want 0x%x", got, want)
}
}

func testAllocs(t *testing.T, fn func()) {
t.Helper()
if allocs := int(testing.AllocsPerRun(10, fn)); allocs > 0 {
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