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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package crc32

import (
        "io"
        "testing"
)

type test struct {
        ieee, castagnoli uint32
        in               string
}

var golden = []test{
        {0x0, 0x0, ""},
        {0xe8b7be43, 0xc1d04330, "a"},
        {0x9e83486d, 0xe2a22936, "ab"},
        {0x352441c2, 0x364b3fb7, "abc"},
        {0xed82cd11, 0x92c80a31, "abcd"},
        {0x8587d865, 0xc450d697, "abcde"},
        {0x4b8e39ef, 0x53bceff1, "abcdef"},
        {0x312a6aa6, 0xe627f441, "abcdefg"},
        {0xaeef2a50, 0xa9421b7, "abcdefgh"},
        {0x8da988af, 0x2ddc99fc, "abcdefghi"},
        {0x3981703a, 0xe6599437, "abcdefghij"},
        {0x6b9cdfe7, 0xb2cc01fe, "Discard medicine more than two years old."},
        {0xc90ef73f, 0xe28207f, "He who has a shady past knows that nice guys finish last."},
        {0xb902341f, 0xbe93f964, "I wouldn't marry him with a ten foot pole."},
        {0x42080e8, 0x9e3be0c3, "Free! Free!/A trip/to Mars/for 900/empty jars/Burma Shave"},
        {0x154c6d11, 0xf505ef04, "The days of the digital watch are numbered.  -Tom Stoppard"},
        {0x4c418325, 0x85d3dc82, "Nepal premier won't resign."},
        {0x33955150, 0xc5142380, "For every action there is an equal and opposite government program."},
        {0x26216a4b, 0x75eb77dd, "His money is twice tainted: 'taint yours and 'taint mine."},
        {0x1abbe45e, 0x91ebe9f7, "There is no reason for any individual to have a computer in their home. -Ken Olsen, 1977"},
        {0xc89a94f7, 0xf0b1168e, "It's a tiny change to the code and not completely disgusting. - Bob Manchek"},
        {0xab3abe14, 0x572b74e2, "size:  a.out:  bad magic"},
        {0xbab102b6, 0x8a58a6d5, "The major problem is with sendmail.  -Mark Horton"},
        {0x999149d7, 0x9c426c50, "Give me a rock, paper and scissors and I will move the world.  CCFestoon"},
        {0x6d52a33c, 0x735400a4, "If the enemy is within range, then so are you."},
        {0x90631e8d, 0xbec49c95, "It's well we cannot hear the screams/That we create in others' dreams."},
        {0x78309130, 0xa95a2079, "You remind me of a TV show, but that's all right: I watch it anyway."},
        {0x7d0a377f, 0xde2e65c5, "C is as portable as Stonehedge!!"},
        {0x8c79fd79, 0x297a88ed, "Even if I could be Shakespeare, I think I should still choose to be Faraday. - A. Huxley"},
        {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"},
        {0x8e0bb443, 0xdcded527, "How can you write a big system without C++?  -Paul Glick"},
}

func TestGolden(t *testing.T) {
        castagnoliTab := MakeTable(Castagnoli)

        for _, g := range golden {
                ieee := NewIEEE()
                io.WriteString(ieee, g.in)
                s := ieee.Sum32()
                if s != g.ieee {
                        t.Errorf("IEEE(%s) = 0x%x want 0x%x", g.in, s, g.ieee)
                }

                castagnoli := New(castagnoliTab)
                io.WriteString(castagnoli, g.in)
                s = castagnoli.Sum32()
                if s != g.castagnoli {
                        t.Errorf("Castagnoli(%s) = 0x%x want 0x%x", g.in, s, g.castagnoli)
                }

                if len(g.in) > 0 {
                        // The SSE4.2 implementation of this has code to deal
                        // with misaligned data so we ensure that we test that
                        // too.
                        castagnoli = New(castagnoliTab)
                        io.WriteString(castagnoli, g.in[:1])
                        io.WriteString(castagnoli, g.in[1:])
                        s = castagnoli.Sum32()
                        if s != g.castagnoli {
                                t.Errorf("Castagnoli[misaligned](%s) = 0x%x want 0x%x", g.in, s, g.castagnoli)
                        }
                }
        }
}

func BenchmarkCrc32KB(b *testing.B) {
        b.StopTimer()
        data := make([]uint8, 1024)
        for i := 0; i < 1024; i++ {
                data[i] = uint8(i)
        }
        c := NewIEEE()
        b.StartTimer()
        b.SetBytes(int64(len(data)))

        for i := 0; i < b.N; i++ {
                c.Write(data)
        }
}