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    1 // Copyright 2009 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 adler32
    6 
    7 import (
    8     "encoding"
    9     "io"
   10     "strings"
   11     "testing"
   12 )
   13 
   14 var golden = []struct {
   15     out       uint32
   16     in        string
   17     halfState string // marshaled hash state after first half of in written, used by TestGoldenMarshal
   18 }{
   19     {0x00000001, "", "adl\x01\x00\x00\x00\x01"},
   20     {0x00620062, "a", "adl\x01\x00\x00\x00\x01"},
   21     {0x012600c4, "ab", "adl\x01\x00b\x00b"},
   22     {0x024d0127, "abc", "adl\x01\x00b\x00b"},
   23     {0x03d8018b, "abcd", "adl\x01\x01&\x00\xc4"},
   24     {0x05c801f0, "abcde", "adl\x01\x01&\x00\xc4"},
   25     {0x081e0256, "abcdef", "adl\x01\x02M\x01'"},
   26     {0x0adb02bd, "abcdefg", "adl\x01\x02M\x01'"},
   27     {0x0e000325, "abcdefgh", "adl\x01\x03\xd8\x01\x8b"},
   28     {0x118e038e, "abcdefghi", "adl\x01\x03\xd8\x01\x8b"},
   29     {0x158603f8, "abcdefghij", "adl\x01\x05\xc8\x01\xf0"},
   30     {0x3f090f02, "Discard medicine more than two years old.", "adl\x01NU\a\x87"},
   31     {0x46d81477, "He who has a shady past knows that nice guys finish last.", "adl\x01\x89\x8e\t\xe9"},
   32     {0x40ee0ee1, "I wouldn't marry him with a ten foot pole.", "adl\x01R\t\ag"},
   33     {0x16661315, "Free! Free!/A trip/to Mars/for 900/empty jars/Burma Shave", "adl\x01\u007f\xbb\t\x10"},
   34     {0x5b2e1480, "The days of the digital watch are numbered.  -Tom Stoppard", "adl\x01\x99:\n~"},
   35     {0x8c3c09ea, "Nepal premier won't resign.", "adl\x01\"\x05\x05\x05"},
   36     {0x45ac18fd, "For every action there is an equal and opposite government program.", "adl\x01\xcc\xfa\f\x00"},
   37     {0x53c61462, "His money is twice tainted: 'taint yours and 'taint mine.", "adl\x01\x93\xa9\n\b"},
   38     {0x7e511e63, "There is no reason for any individual to have a computer in their home. -Ken Olsen, 1977", "adl\x01e\xf5\x10\x14"},
   39     {0xe4801a6a, "It's a tiny change to the code and not completely disgusting. - Bob Manchek", "adl\x01\xee\x00\f\xb2"},
   40     {0x61b507df, "size:  a.out:  bad magic", "adl\x01\x1a\xfc\x04\x1d"},
   41     {0xb8631171, "The major problem is with sendmail.  -Mark Horton", "adl\x01mi\b\xdc"},
   42     {0x8b5e1904, "Give me a rock, paper and scissors and I will move the world.  CCFestoon", "adl\x01\xe3\n\f\x9f"},
   43     {0x7cc6102b, "If the enemy is within range, then so are you.", "adl\x01_\xe0\b\x1e"},
   44     {0x700318e7, "It's well we cannot hear the screams/That we create in others' dreams.", "adl\x01ۘ\f\x87"},
   45     {0x1e601747, "You remind me of a TV show, but that's all right: I watch it anyway.", "adl\x01\xcc}\v\x83"},
   46     {0xb55b0b09, "C is as portable as Stonehedge!!", "adl\x01,^\x05\xad"},
   47     {0x39111dd0, "Even if I could be Shakespeare, I think I should still choose to be Faraday. - A. Huxley", "adl\x01M\xd1\x0e\xc8"},
   48     {0x91dd304f, "The fugacity of a constituent in a mixture of gases at a given temperature is proportional to its mole fraction.  Lewis-Randall Rule", "adl\x01#\xd8\x17\xd7"},
   49     {0x2e5d1316, "How can you write a big system without C++?  -Paul Glick", "adl\x01\x8fU\n\x0f"},
   50     {0xd0201df6, "'Invariant assertions' is the most elegant programming technique!  -Tom Szymanski", "adl\x01/\x98\x0e\xc4"},
   51     {0x211297c8, strings.Repeat("\xff", 5548) + "8", "adl\x01\x9a\xa6\xcb\xc1"},
   52     {0xbaa198c8, strings.Repeat("\xff", 5549) + "9", "adl\x01gu\xcc\xc0"},
   53     {0x553499be, strings.Repeat("\xff", 5550) + "0", "adl\x01gu\xcc\xc0"},
   54     {0xf0c19abe, strings.Repeat("\xff", 5551) + "1", "adl\x015CͿ"},
   55     {0x8d5c9bbe, strings.Repeat("\xff", 5552) + "2", "adl\x015CͿ"},
   56     {0x2af69cbe, strings.Repeat("\xff", 5553) + "3", "adl\x01\x04\x10ξ"},
   57     {0xc9809dbe, strings.Repeat("\xff", 5554) + "4", "adl\x01\x04\x10ξ"},
   58     {0x69189ebe, strings.Repeat("\xff", 5555) + "5", "adl\x01\xd3\xcdϽ"},
   59     {0x86af0001, strings.Repeat("\x00", 1e5), "adl\x01\xc3P\x00\x01"},
   60     {0x79660b4d, strings.Repeat("a", 1e5), "adl\x01\x81k\x05\xa7"},
   61     {0x110588ee, strings.Repeat("ABCDEFGHIJKLMNOPQRSTUVWXYZ", 1e4), "adl\x01e\xd2\xc4p"},
   62 }
   63 
   64 // checksum is a slow but simple implementation of the Adler-32 checksum.
   65 // It is a straight port of the sample code in RFC 1950 section 9.
   66 func checksum(p []byte) uint32 {
   67     s1, s2 := uint32(1), uint32(0)
   68     for _, x := range p {
   69         s1 = (s1 + uint32(x)) % mod
   70         s2 = (s2 + s1) % mod
   71     }
   72     return s2<<16 | s1
   73 }
   74 
   75 func TestGolden(t *testing.T) {
   76     for _, g := range golden {
   77         in := g.in
   78         if len(in) > 220 {
   79             in = in[:100] + "..." + in[len(in)-100:]
   80         }
   81         p := []byte(g.in)
   82         if got := checksum(p); got != g.out {
   83             t.Errorf("simple implementation: checksum(%q) = 0x%x want 0x%x", in, got, g.out)
   84             continue
   85         }
   86         if got := Checksum(p); got != g.out {
   87             t.Errorf("optimized implementation: Checksum(%q) = 0x%x want 0x%x", in, got, g.out)
   88             continue
   89         }
   90     }
   91 }
   92 
   93 func TestGoldenMarshal(t *testing.T) {
   94     for _, g := range golden {
   95         h := New()
   96         h2 := New()
   97 
   98         io.WriteString(h, g.in[:len(g.in)/2])
   99 
  100         state, err := h.(encoding.BinaryMarshaler).MarshalBinary()
  101         if err != nil {
  102             t.Errorf("could not marshal: %v", err)
  103             continue
  104         }
  105 
  106         if string(state) != g.halfState {
  107             t.Errorf("checksum(%q) state = %q, want %q", g.in, state, g.halfState)
  108             continue
  109         }
  110 
  111         if err := h2.(encoding.BinaryUnmarshaler).UnmarshalBinary(state); err != nil {
  112             t.Errorf("could not unmarshal: %v", err)
  113             continue
  114         }
  115 
  116         io.WriteString(h, g.in[len(g.in)/2:])
  117         io.WriteString(h2, g.in[len(g.in)/2:])
  118 
  119         if h.Sum32() != h2.Sum32() {
  120             t.Errorf("checksum(%q) = 0x%x != marshaled (0x%x)", g.in, h.Sum32(), h2.Sum32())
  121         }
  122     }
  123 }
  124 
  125 func BenchmarkAdler32KB(b *testing.B) {
  126     b.SetBytes(1024)
  127     data := make([]byte, 1024)
  128     for i := range data {
  129         data[i] = byte(i)
  130     }
  131     h := New()
  132     in := make([]byte, 0, h.Size())
  133 
  134     b.ResetTimer()
  135     for i := 0; i < b.N; i++ {
  136         h.Reset()
  137         h.Write(data)
  138         h.Sum(in)
  139     }
  140 }