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package reedsolomon
import (
"bytes"
"testing"
)
func TestVerifyEncMatrixVand(t *testing.T) {
a, err := genEncMatrixVand(4, 4)
if err != nil {
t.Fatal(err)
}
e := []byte{1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1,
27, 28, 18, 20,
28, 27, 20, 18,
18, 20, 27, 28,
20, 18, 28, 27}
if !bytes.Equal(a, e) {
t.Fatal("mismatch")
}
}
func TestVerifyEncMatrixCauchy(t *testing.T) {
a := genEncMatrixCauchy(4, 4)
e := []byte{1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1,
71, 167, 122, 186,
167, 71, 186, 122,
122, 186, 71, 167,
186, 122, 167, 71}
if !bytes.Equal(a, e) {
t.Fatal("mismatch")
}
}
func TestMatrixInvert(t *testing.T) {
testCases := []struct {
matrixData []byte
cols int
expect []byte
ok bool
expectedErr error
}{
{
[]byte{56, 23, 98,
3, 100, 200,
45, 201, 123},
3,
[]byte{175, 133, 33,
130, 13, 245,
112, 35, 126},
true,
nil,
},
{
[]byte{0, 23, 98,
3, 100, 200,
45, 201, 123},
3,
[]byte{245, 128, 152,
188, 64, 135,
231, 81, 239},
true,
nil,
},
{
[]byte{1, 0, 0, 0, 0,
0, 1, 0, 0, 0,
0, 0, 0, 1, 0,
0, 0, 0, 0, 1,
7, 7, 6, 6, 1},
5,
[]byte{1, 0, 0, 0, 0,
0, 1, 0, 0, 0,
123, 123, 1, 122, 122,
0, 0, 1, 0, 0,
0, 0, 0, 1, 0},
true,
nil,
},
{
[]byte{4, 2,
12, 6},
2,
nil,
false,
errSingular,
},
}
for i, c := range testCases {
m := matrix(c.matrixData)
raw := make([]byte, 2*c.cols*c.cols)
actual := make([]byte, c.cols*c.cols)
actualErr := m.invert(raw, c.cols, actual)
if actualErr != nil && c.ok {
t.Errorf("case.%d, expected to pass, but failed with: <ERROR> %s", i+1, actualErr.Error())
}
if actualErr == nil && !c.ok {
t.Errorf("case.%d, expected to fail with <ERROR> \"%s\", but passed", i+1, c.expectedErr)
}
if actualErr != nil && !c.ok {
if c.expectedErr != actualErr {
t.Errorf("case.%d, expected to fail with error \"%s\", but instead failed with error \"%s\"", i+1, c.expectedErr, actualErr)
}
}
if actualErr == nil && c.ok {
if !bytes.Equal(c.expect, actual) {
t.Errorf("case.%d, mismatch", i+1)
}
}
}
}
func benchmarkInvert(b *testing.B, size int) {
m := genEncMatrixCauchy(size, 2)
m.swap(0, size, size)
m.swap(1, size+1, size)
b.ResetTimer()
buf := make([]byte, 3*size*size)
raw := buf[:2*size*size]
r := buf[2*size*size:]
for i := 0; i < b.N; i++ {
err := m.invert(raw, size, r)
if err != nil {
b.Fatal(err)
}
}
}
func BenchmarkInvert5x5(b *testing.B) {
benchmarkInvert(b, 5)
}
func BenchmarkInvert10x10(b *testing.B) {
benchmarkInvert(b, 10)
}
func BenchmarkInvert20x20(b *testing.B) {
benchmarkInvert(b, 20)
}
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