100 lines
3.5 KiB
Go
100 lines
3.5 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package crc32
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import (
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"io"
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"testing"
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)
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type test struct {
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ieee, castagnoli uint32
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in string
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}
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var golden = []test{
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{0x0, 0x0, ""},
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{0xe8b7be43, 0xc1d04330, "a"},
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{0x9e83486d, 0xe2a22936, "ab"},
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{0x352441c2, 0x364b3fb7, "abc"},
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{0xed82cd11, 0x92c80a31, "abcd"},
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{0x8587d865, 0xc450d697, "abcde"},
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{0x4b8e39ef, 0x53bceff1, "abcdef"},
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{0x312a6aa6, 0xe627f441, "abcdefg"},
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{0xaeef2a50, 0xa9421b7, "abcdefgh"},
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{0x8da988af, 0x2ddc99fc, "abcdefghi"},
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{0x3981703a, 0xe6599437, "abcdefghij"},
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{0x6b9cdfe7, 0xb2cc01fe, "Discard medicine more than two years old."},
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{0xc90ef73f, 0xe28207f, "He who has a shady past knows that nice guys finish last."},
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{0xb902341f, 0xbe93f964, "I wouldn't marry him with a ten foot pole."},
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{0x42080e8, 0x9e3be0c3, "Free! Free!/A trip/to Mars/for 900/empty jars/Burma Shave"},
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{0x154c6d11, 0xf505ef04, "The days of the digital watch are numbered. -Tom Stoppard"},
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{0x4c418325, 0x85d3dc82, "Nepal premier won't resign."},
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{0x33955150, 0xc5142380, "For every action there is an equal and opposite government program."},
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{0x26216a4b, 0x75eb77dd, "His money is twice tainted: 'taint yours and 'taint mine."},
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{0x1abbe45e, 0x91ebe9f7, "There is no reason for any individual to have a computer in their home. -Ken Olsen, 1977"},
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{0xc89a94f7, 0xf0b1168e, "It's a tiny change to the code and not completely disgusting. - Bob Manchek"},
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{0xab3abe14, 0x572b74e2, "size: a.out: bad magic"},
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{0xbab102b6, 0x8a58a6d5, "The major problem is with sendmail. -Mark Horton"},
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{0x999149d7, 0x9c426c50, "Give me a rock, paper and scissors and I will move the world. CCFestoon"},
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{0x6d52a33c, 0x735400a4, "If the enemy is within range, then so are you."},
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{0x90631e8d, 0xbec49c95, "It's well we cannot hear the screams/That we create in others' dreams."},
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{0x78309130, 0xa95a2079, "You remind me of a TV show, but that's all right: I watch it anyway."},
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{0x7d0a377f, 0xde2e65c5, "C is as portable as Stonehedge!!"},
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{0x8c79fd79, 0x297a88ed, "Even if I could be Shakespeare, I think I should still choose to be Faraday. - A. Huxley"},
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{0xa20b7167, 0x66ed1d8b, "The fugacity of a constituent in a mixture of gases at a given temperature is proportional to its mole fraction. Lewis-Randall Rule"},
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{0x8e0bb443, 0xdcded527, "How can you write a big system without C++? -Paul Glick"},
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}
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func TestGolden(t *testing.T) {
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castagnoliTab := MakeTable(Castagnoli)
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for _, g := range golden {
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ieee := NewIEEE()
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io.WriteString(ieee, g.in)
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s := ieee.Sum32()
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if s != g.ieee {
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t.Errorf("IEEE(%s) = 0x%x want 0x%x", g.in, s, g.ieee)
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}
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castagnoli := New(castagnoliTab)
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io.WriteString(castagnoli, g.in)
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s = castagnoli.Sum32()
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if s != g.castagnoli {
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t.Errorf("Castagnoli(%s) = 0x%x want 0x%x", g.in, s, g.castagnoli)
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}
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if len(g.in) > 0 {
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// The SSE4.2 implementation of this has code to deal
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// with misaligned data so we ensure that we test that
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// too.
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castagnoli = New(castagnoliTab)
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io.WriteString(castagnoli, g.in[:1])
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io.WriteString(castagnoli, g.in[1:])
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s = castagnoli.Sum32()
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if s != g.castagnoli {
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t.Errorf("Castagnoli[misaligned](%s) = 0x%x want 0x%x", g.in, s, g.castagnoli)
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}
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}
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}
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}
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func BenchmarkCrc32KB(b *testing.B) {
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b.SetBytes(1024)
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data := make([]byte, 1024)
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for i := range data {
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data[i] = byte(i)
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}
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h := NewIEEE()
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in := make([]byte, 0, h.Size())
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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h.Reset()
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h.Write(data)
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h.Sum(in)
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}
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}
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