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Source file src/hash/fnv/fnv_test.go

Documentation: hash/fnv

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package fnv
     6  
     7  import (
     8  	"bytes"
     9  	"encoding"
    10  	"encoding/binary"
    11  	"hash"
    12  	"io"
    13  	"testing"
    14  )
    15  
    16  type golden struct {
    17  	out       []byte
    18  	in        string
    19  	halfState string // marshaled hash state after first half of in written, used by TestGoldenMarshal
    20  }
    21  
    22  var golden32 = []golden{
    23  	{[]byte{0x81, 0x1c, 0x9d, 0xc5}, "", "fnv\x01\x81\x1c\x9d\xc5"},
    24  	{[]byte{0x05, 0x0c, 0x5d, 0x7e}, "a", "fnv\x01\x81\x1c\x9d\xc5"},
    25  	{[]byte{0x70, 0x77, 0x2d, 0x38}, "ab", "fnv\x01\x05\f]~"},
    26  	{[]byte{0x43, 0x9c, 0x2f, 0x4b}, "abc", "fnv\x01\x05\f]~"},
    27  }
    28  
    29  var golden32a = []golden{
    30  	{[]byte{0x81, 0x1c, 0x9d, 0xc5}, "", "fnv\x02\x81\x1c\x9d\xc5"},
    31  	{[]byte{0xe4, 0x0c, 0x29, 0x2c}, "a", "fnv\x02\x81\x1c\x9d\xc5"},
    32  	{[]byte{0x4d, 0x25, 0x05, 0xca}, "ab", "fnv\x02\xe4\f),"},
    33  	{[]byte{0x1a, 0x47, 0xe9, 0x0b}, "abc", "fnv\x02\xe4\f),"},
    34  }
    35  
    36  var golden64 = []golden{
    37  	{[]byte{0xcb, 0xf2, 0x9c, 0xe4, 0x84, 0x22, 0x23, 0x25}, "", "fnv\x03\xcb\xf2\x9c\xe4\x84\"#%"},
    38  	{[]byte{0xaf, 0x63, 0xbd, 0x4c, 0x86, 0x01, 0xb7, 0xbe}, "a", "fnv\x03\xcb\xf2\x9c\xe4\x84\"#%"},
    39  	{[]byte{0x08, 0x32, 0x67, 0x07, 0xb4, 0xeb, 0x37, 0xb8}, "ab", "fnv\x03\xafc\xbdL\x86\x01\xb7\xbe"},
    40  	{[]byte{0xd8, 0xdc, 0xca, 0x18, 0x6b, 0xaf, 0xad, 0xcb}, "abc", "fnv\x03\xafc\xbdL\x86\x01\xb7\xbe"},
    41  }
    42  
    43  var golden64a = []golden{
    44  	{[]byte{0xcb, 0xf2, 0x9c, 0xe4, 0x84, 0x22, 0x23, 0x25}, "", "fnv\x04\xcb\xf2\x9c\xe4\x84\"#%"},
    45  	{[]byte{0xaf, 0x63, 0xdc, 0x4c, 0x86, 0x01, 0xec, 0x8c}, "a", "fnv\x04\xcb\xf2\x9c\xe4\x84\"#%"},
    46  	{[]byte{0x08, 0x9c, 0x44, 0x07, 0xb5, 0x45, 0x98, 0x6a}, "ab", "fnv\x04\xafc\xdcL\x86\x01\xec\x8c"},
    47  	{[]byte{0xe7, 0x1f, 0xa2, 0x19, 0x05, 0x41, 0x57, 0x4b}, "abc", "fnv\x04\xafc\xdcL\x86\x01\xec\x8c"},
    48  }
    49  
    50  var golden128 = []golden{
    51  	{[]byte{0x6c, 0x62, 0x27, 0x2e, 0x07, 0xbb, 0x01, 0x42, 0x62, 0xb8, 0x21, 0x75, 0x62, 0x95, 0xc5, 0x8d}, "", "fnv\x05lb'.\a\xbb\x01Bb\xb8!ub\x95ō"},
    52  	{[]byte{0xd2, 0x28, 0xcb, 0x69, 0x10, 0x1a, 0x8c, 0xaf, 0x78, 0x91, 0x2b, 0x70, 0x4e, 0x4a, 0x14, 0x1e}, "a", "fnv\x05lb'.\a\xbb\x01Bb\xb8!ub\x95ō"},
    53  	{[]byte{0x8, 0x80, 0x94, 0x5a, 0xee, 0xab, 0x1b, 0xe9, 0x5a, 0xa0, 0x73, 0x30, 0x55, 0x26, 0xc0, 0x88}, "ab", "fnv\x05\xd2(\xcbi\x10\x1a\x8c\xafx\x91+pNJ\x14\x1e"},
    54  	{[]byte{0xa6, 0x8b, 0xb2, 0xa4, 0x34, 0x8b, 0x58, 0x22, 0x83, 0x6d, 0xbc, 0x78, 0xc6, 0xae, 0xe7, 0x3b}, "abc", "fnv\x05\xd2(\xcbi\x10\x1a\x8c\xafx\x91+pNJ\x14\x1e"},
    55  }
    56  
    57  var golden128a = []golden{
    58  	{[]byte{0x6c, 0x62, 0x27, 0x2e, 0x07, 0xbb, 0x01, 0x42, 0x62, 0xb8, 0x21, 0x75, 0x62, 0x95, 0xc5, 0x8d}, "", "fnv\x06lb'.\a\xbb\x01Bb\xb8!ub\x95ō"},
    59  	{[]byte{0xd2, 0x28, 0xcb, 0x69, 0x6f, 0x1a, 0x8c, 0xaf, 0x78, 0x91, 0x2b, 0x70, 0x4e, 0x4a, 0x89, 0x64}, "a", "fnv\x06lb'.\a\xbb\x01Bb\xb8!ub\x95ō"},
    60  	{[]byte{0x08, 0x80, 0x95, 0x44, 0xbb, 0xab, 0x1b, 0xe9, 0x5a, 0xa0, 0x73, 0x30, 0x55, 0xb6, 0x9a, 0x62}, "ab", "fnv\x06\xd2(\xcbio\x1a\x8c\xafx\x91+pNJ\x89d"},
    61  	{[]byte{0xa6, 0x8d, 0x62, 0x2c, 0xec, 0x8b, 0x58, 0x22, 0x83, 0x6d, 0xbc, 0x79, 0x77, 0xaf, 0x7f, 0x3b}, "abc", "fnv\x06\xd2(\xcbio\x1a\x8c\xafx\x91+pNJ\x89d"},
    62  }
    63  
    64  func TestGolden32(t *testing.T) {
    65  	testGolden(t, New32(), golden32)
    66  }
    67  
    68  func TestGolden32a(t *testing.T) {
    69  	testGolden(t, New32a(), golden32a)
    70  }
    71  
    72  func TestGolden64(t *testing.T) {
    73  	testGolden(t, New64(), golden64)
    74  }
    75  
    76  func TestGolden64a(t *testing.T) {
    77  	testGolden(t, New64a(), golden64a)
    78  }
    79  
    80  func TestGolden128(t *testing.T) {
    81  	testGolden(t, New128(), golden128)
    82  }
    83  
    84  func TestGolden128a(t *testing.T) {
    85  	testGolden(t, New128a(), golden128a)
    86  }
    87  
    88  func testGolden(t *testing.T, hash hash.Hash, gold []golden) {
    89  	for _, g := range gold {
    90  		hash.Reset()
    91  		done, error := hash.Write([]byte(g.in))
    92  		if error != nil {
    93  			t.Fatalf("write error: %s", error)
    94  		}
    95  		if done != len(g.in) {
    96  			t.Fatalf("wrote only %d out of %d bytes", done, len(g.in))
    97  		}
    98  		if actual := hash.Sum(nil); !bytes.Equal(g.out, actual) {
    99  			t.Errorf("hash(%q) = 0x%x want 0x%x", g.in, actual, g.out)
   100  		}
   101  	}
   102  }
   103  
   104  func TestGoldenMarshal(t *testing.T) {
   105  	tests := []struct {
   106  		name    string
   107  		newHash func() hash.Hash
   108  		gold    []golden
   109  	}{
   110  		{"32", func() hash.Hash { return New32() }, golden32},
   111  		{"32a", func() hash.Hash { return New32a() }, golden32a},
   112  		{"64", func() hash.Hash { return New64() }, golden64},
   113  		{"64a", func() hash.Hash { return New64a() }, golden64a},
   114  		{"128", func() hash.Hash { return New128() }, golden128},
   115  		{"128a", func() hash.Hash { return New128a() }, golden128a},
   116  	}
   117  	for _, tt := range tests {
   118  		t.Run(tt.name, func(t *testing.T) {
   119  			for _, g := range tt.gold {
   120  				h := tt.newHash()
   121  				h2 := tt.newHash()
   122  
   123  				io.WriteString(h, g.in[:len(g.in)/2])
   124  
   125  				state, err := h.(encoding.BinaryMarshaler).MarshalBinary()
   126  				if err != nil {
   127  					t.Errorf("could not marshal: %v", err)
   128  					continue
   129  				}
   130  
   131  				if string(state) != g.halfState {
   132  					t.Errorf("checksum(%q) state = %q, want %q", g.in, state, g.halfState)
   133  					continue
   134  				}
   135  
   136  				if err := h2.(encoding.BinaryUnmarshaler).UnmarshalBinary(state); err != nil {
   137  					t.Errorf("could not unmarshal: %v", err)
   138  					continue
   139  				}
   140  
   141  				io.WriteString(h, g.in[len(g.in)/2:])
   142  				io.WriteString(h2, g.in[len(g.in)/2:])
   143  
   144  				if actual, actual2 := h.Sum(nil), h2.Sum(nil); !bytes.Equal(actual, actual2) {
   145  					t.Errorf("hash(%q) = 0x%x != marshaled 0x%x", g.in, actual, actual2)
   146  				}
   147  			}
   148  		})
   149  	}
   150  }
   151  
   152  func TestIntegrity32(t *testing.T) {
   153  	testIntegrity(t, New32())
   154  }
   155  
   156  func TestIntegrity32a(t *testing.T) {
   157  	testIntegrity(t, New32a())
   158  }
   159  
   160  func TestIntegrity64(t *testing.T) {
   161  	testIntegrity(t, New64())
   162  }
   163  
   164  func TestIntegrity64a(t *testing.T) {
   165  	testIntegrity(t, New64a())
   166  }
   167  func TestIntegrity128(t *testing.T) {
   168  	testIntegrity(t, New128())
   169  }
   170  
   171  func TestIntegrity128a(t *testing.T) {
   172  	testIntegrity(t, New128a())
   173  }
   174  
   175  func testIntegrity(t *testing.T, h hash.Hash) {
   176  	data := []byte{'1', '2', 3, 4, 5}
   177  	h.Write(data)
   178  	sum := h.Sum(nil)
   179  
   180  	if size := h.Size(); size != len(sum) {
   181  		t.Fatalf("Size()=%d but len(Sum())=%d", size, len(sum))
   182  	}
   183  
   184  	if a := h.Sum(nil); !bytes.Equal(sum, a) {
   185  		t.Fatalf("first Sum()=0x%x, second Sum()=0x%x", sum, a)
   186  	}
   187  
   188  	h.Reset()
   189  	h.Write(data)
   190  	if a := h.Sum(nil); !bytes.Equal(sum, a) {
   191  		t.Fatalf("Sum()=0x%x, but after Reset() Sum()=0x%x", sum, a)
   192  	}
   193  
   194  	h.Reset()
   195  	h.Write(data[:2])
   196  	h.Write(data[2:])
   197  	if a := h.Sum(nil); !bytes.Equal(sum, a) {
   198  		t.Fatalf("Sum()=0x%x, but with partial writes, Sum()=0x%x", sum, a)
   199  	}
   200  
   201  	switch h.Size() {
   202  	case 4:
   203  		sum32 := h.(hash.Hash32).Sum32()
   204  		if sum32 != binary.BigEndian.Uint32(sum) {
   205  			t.Fatalf("Sum()=0x%x, but Sum32()=0x%x", sum, sum32)
   206  		}
   207  	case 8:
   208  		sum64 := h.(hash.Hash64).Sum64()
   209  		if sum64 != binary.BigEndian.Uint64(sum) {
   210  			t.Fatalf("Sum()=0x%x, but Sum64()=0x%x", sum, sum64)
   211  		}
   212  	case 16:
   213  		// There's no Sum128 function, so we don't need to test anything here.
   214  	}
   215  }
   216  
   217  func BenchmarkFnv32KB(b *testing.B) {
   218  	benchmarkKB(b, New32())
   219  }
   220  
   221  func BenchmarkFnv32aKB(b *testing.B) {
   222  	benchmarkKB(b, New32a())
   223  }
   224  
   225  func BenchmarkFnv64KB(b *testing.B) {
   226  	benchmarkKB(b, New64())
   227  }
   228  
   229  func BenchmarkFnv64aKB(b *testing.B) {
   230  	benchmarkKB(b, New64a())
   231  }
   232  
   233  func BenchmarkFnv128KB(b *testing.B) {
   234  	benchmarkKB(b, New128())
   235  }
   236  
   237  func BenchmarkFnv128aKB(b *testing.B) {
   238  	benchmarkKB(b, New128a())
   239  }
   240  
   241  func benchmarkKB(b *testing.B, h hash.Hash) {
   242  	b.SetBytes(1024)
   243  	data := make([]byte, 1024)
   244  	for i := range data {
   245  		data[i] = byte(i)
   246  	}
   247  	in := make([]byte, 0, h.Size())
   248  
   249  	b.ResetTimer()
   250  	for i := 0; i < b.N; i++ {
   251  		h.Reset()
   252  		h.Write(data)
   253  		h.Sum(in)
   254  	}
   255  }
   256  

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