Exemplo n.º 1
0
func testIncremental(t *testing.T, h hash.Hash32, result uint32, which string) {

	h.Reset()

	var parts = []string{
		"h",
		"ell",
		"o",
		"he",
		"llo",
		"hellohello",
	}

	for _, p := range parts {
		l, _ := h.Write([]byte(p))
		if l != len(p) {
			t.Errorf("Write(%d bytes) = %d, want %d\n", len(p), l, len(p))
		}
	}

	h32 := h.Sum32()

	if h32 != result {
		t.Errorf("%s: incremental failed: got %08x", which, h32)
	}

	h.Reset()
	h.Write([]byte("hellohellohellohello"))

	h32 = h.Sum32()

	if h32 != result {
		t.Errorf("%s: failed: got %08x", which, h32)
	}
}
Exemplo n.º 2
0
func testIncremental(t *testing.T, h hash.Hash32, result uint32, which string) {

	h.Reset()

	h.Write([]byte("hello"))
	h.Write([]byte("h"))
	h.Write([]byte("e"))
	h.Write([]byte("l"))
	h.Write([]byte("l"))
	h.Write([]byte("o"))
	h.Write([]byte("hellohello"))

	h32 := h.Sum32()

	if h32 != result {
		t.Errorf("%s: incremental failed: got %08x", which, h32)
	}

	h.Reset()
	h.Write([]byte("hellohellohellohello"))

	h32 = h.Sum32()

	if h32 != result {
		t.Errorf("%s: failed: got %08x", which, h32)
	}
}
Exemplo n.º 3
0
func TestRef(t *testing.T) {
	for _, elem := range data {

		var h32 hash.Hash32 = New32()
		h32.Write([]byte(elem.s))
		if v := h32.Sum32(); v != elem.h32 {
			t.Errorf("'%s': 0x%x (want 0x%x)", elem.s, v, elem.h32)
		}

		if v := Sum32([]byte(elem.s)); v != elem.h32 {
			t.Errorf("'%s': 0x%x (want 0x%x)", elem.s, v, elem.h32)
		}

		var h64 hash.Hash64 = New64()
		h64.Write([]byte(elem.s))
		if v := h64.Sum64(); v != elem.h64_1 {
			t.Errorf("'%s': 0x%x (want 0x%x)", elem.s, v, elem.h64_1)
		}

		var h128 Hash128 = New128()
		h128.Write([]byte(elem.s))
		if v1, v2 := h128.Sum128(); v1 != elem.h64_1 || v2 != elem.h64_2 {
			t.Errorf("'%s': 0x%x-0x%x (want 0x%x-0x%x)", elem.s, v1, v2, elem.h64_1, elem.h64_2)
		}

		if v1, v2 := Sum128([]byte(elem.s)); v1 != elem.h64_1 || v2 != elem.h64_2 {
			t.Errorf("'%s': 0x%x-0x%x (want 0x%x-0x%x)", elem.s, v1, v2, elem.h64_1, elem.h64_2)
		}
	}
}
Exemplo n.º 4
0
func commonBench(b *testing.B, h hash.Hash32, golden []_Golden) {
	for i := 0; i < b.N; i++ {
		for _, g := range golden {
			h.Reset()
			h.Write([]byte(g.in))
			h.Sum32()
		}
	}
}
Exemplo n.º 5
0
func imageHash(h hash.Hash32, dir *Directory, img *Image) int {
	h.Reset()
	h.Write([]byte(dir.RelPat()))
	h.Write([]byte(img.Name()))
	bytes, err := img.FileTime().MarshalBinary()
	if err == nil {
		h.Write(bytes)
	}
	return int(h.Sum32())
}
Exemplo n.º 6
0
func TestRef(t *testing.T) {
	for _, elem := range data {

		var h32 hash.Hash32 = New32()
		h32.Write([]byte(elem.s))
		if v := h32.Sum32(); v != elem.h32 {
			t.Errorf("'%s': 0x%x (want 0x%x)", elem.s, v, elem.h32)
		}

		var h32_byte hash.Hash32 = New32()
		h32_byte.Write([]byte(elem.s))
		target := fmt.Sprintf("%08x", elem.h32)
		if p := fmt.Sprintf("%x", h32_byte.Sum(nil)); p != target {
			t.Errorf("'%s': %s (want %s)", elem.s, p, target)
		}

		if v := Sum32([]byte(elem.s)); v != elem.h32 {
			t.Errorf("'%s': 0x%x (want 0x%x)", elem.s, v, elem.h32)
		}

		var h64 hash.Hash64 = New64()
		h64.Write([]byte(elem.s))
		if v := h64.Sum64(); v != elem.h64_1 {
			t.Errorf("'%s': 0x%x (want 0x%x)", elem.s, v, elem.h64_1)
		}

		var h64_byte hash.Hash64 = New64()
		h64_byte.Write([]byte(elem.s))
		target = fmt.Sprintf("%016x", elem.h64_1)
		if p := fmt.Sprintf("%x", h64_byte.Sum(nil)); p != target {
			t.Errorf("Sum64: '%s': %s (want %s)", elem.s, p, target)
		}

		if v := Sum64([]byte(elem.s)); v != elem.h64_1 {
			t.Errorf("Sum64: '%s': 0x%x (want 0x%x)", elem.s, v, elem.h64_1)
		}

		var h128 Hash128 = New128()
		h128.Write([]byte(elem.s))
		if v1, v2 := h128.Sum128(); v1 != elem.h64_1 || v2 != elem.h64_2 {
			t.Errorf("New128: '%s': 0x%x-0x%x (want 0x%x-0x%x)", elem.s, v1, v2, elem.h64_1, elem.h64_2)
		}

		var h128_byte Hash128 = New128()
		h128_byte.Write([]byte(elem.s))
		target = fmt.Sprintf("%016x%016x", elem.h64_1, elem.h64_2)
		if p := fmt.Sprintf("%x", h128_byte.Sum(nil)); p != target {
			t.Errorf("New128: '%s': %s (want %s)", elem.s, p, target)
		}

		if v1, v2 := Sum128([]byte(elem.s)); v1 != elem.h64_1 || v2 != elem.h64_2 {
			t.Errorf("Sum128: '%s': 0x%x-0x%x (want 0x%x-0x%x)", elem.s, v1, v2, elem.h64_1, elem.h64_2)
		}
	}
}
Exemplo n.º 7
0
// FilesPathToPartition hashes a file path to a partition.
func FilesPathToPartition(h hash.Hash32,
	partitions []string, path string) string {
	if len(partitions) <= 0 {
		return ""
	}

	h.Reset()
	io.WriteString(h, path)
	i := h.Sum32() % uint32(len(partitions))
	return partitions[i]
}
Exemplo n.º 8
0
// Returns shard under given key
func (m ConcurrentMap) GetShard(key string) *ConcurrentMapShared {
	hasherAsInterface := hashPool.Get()
	var hasher hash.Hash32
	if hasherAsInterface == nil {
		hasher = fnv.New32()
	} else {
		hasher = hasherAsInterface.(hash.Hash32)
		hasher.Reset()
	}
	hasher.Write([]byte(key))
	sum := hasher.Sum32()
	hashPool.Put(hasher)
	return m[uint(sum)%uint(SHARD_COUNT)]
}
Exemplo n.º 9
0
func testGolden(t *testing.T, h hash.Hash32, golden []_Golden, which string) {

	for _, g := range golden {
		h.Reset()
		h.Write([]byte(g.in))

		sum := h.Sum32()

		if sum != g.out {
			t.Errorf("%s(%s) = 0x%x want 0x%x", which, g.in, sum, g.out)
		}

		bsum := h.Sum(nil)

		if len(bsum) != 4 {
			t.Errorf("%s Sum(nil) returned %d bytes, wanted 4: %s\n", which, len(bsum), bsum)
		}

		s := binary.BigEndian.Uint32(bsum)

		if s != sum {
			t.Errorf("%s(%s).Sum(nil) = 0x%x want 0x%x", which, g.in, sum, g.out)
		}

		bsum = h.Sum([]byte{0x01, 0x02, 0x03, 0x04})

		if len(bsum) != 8 {
			t.Errorf("%s Sum(bsum) returned %d bytes, wanted 8: %x\n", which, len(bsum), bsum)
		}

		s = binary.BigEndian.Uint32(bsum[0:])
		s2 := binary.BigEndian.Uint32(bsum[4:])

		if s != 0x01020304 || s2 != sum {
			t.Errorf("%s(%s).Sum(bsum) = %x (expected 0x01020304 %x )", which, g.in, bsum, sum)
		}

	}
}
Exemplo n.º 10
0
// SeriesHash returns a hash of the metric, tags pair. The hash falls in uint16
// range.
func (c cmd) SeriesHash(hash hash.Hash32) int {
	hash.Reset()
	buf := c.Point()
	// include Metric
	i := bytes.IndexByte(buf, ' ')
	hash.Write(buf[:i])
	buf = buf[i+1:]
	// exclude Time
	i = bytes.IndexByte(buf, ' ')
	buf = buf[i+1:]
	// exclude Value
	i = bytes.IndexByte(buf, ' ')
	// include Tags
	hash.Write(buf[i:])
	// Sum
	sum := hash.Sum32()
	return int(uint16(sum))
}
Exemplo n.º 11
0
// Hash32 is a convenience method for hashing a string against a hash.Hash32
func Hash32(s string, h hash.Hash32) uint32 {
	h.Reset()
	h.Write([]byte(s))
	return h.Sum32()
}
Exemplo n.º 12
0
	var key []byte

	BeforeEach(func() {
		jhash = New()
		key = []byte("Apple")
	})

	Describe("New", func() {

		It("returns jenkhash", func() {
			var h *jenkhash
			Expect(jhash).To(BeAssignableToTypeOf(h))
		})

		It("initializes offset to 0", func() {
			Expect(jhash.Sum32()).To(Equal(uint32(0)))
		})
	})

	Describe("Write", func() {

		It("returns key length", func() {
			length, _ := jhash.Write(key)
			Expect(length).To(Equal(5))
		})

		It("has no error", func() {
			_, err := jhash.Write(key)
			Expect(err).To(BeNil())
		})