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util_test.go
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util_test.go
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// Copyright (c) 2021 Hirotsuna Mizuno. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.
package bitarray_test
import (
"bytes"
"fmt"
"math/rand"
"strings"
"testing"
"time"
"github.com/tunabay/go-bitarray"
)
func TestCopyBitsB(t *testing.T) {
test := func(
dst, src []byte,
dstOff, srcOff, nBits int,
exp []byte,
) {
t.Helper()
org := make([]byte, len(dst))
copy(org, dst)
bitarray.CopyBitsB(dst, src, dstOff, srcOff, nBits)
if !bytes.Equal(dst, exp) {
t.Error("unexpected result:")
t.Logf("dstOff=%d, srcOff=%d, nBits=%d", dstOff, srcOff, nBits)
t.Logf(" dst: %08b", org)
t.Logf(" src: %08b", src)
t.Logf(" got: %08b", dst)
t.Logf("want: %08b", exp)
t.FailNow()
}
}
test(
[]byte{0b_0000_0000},
[]byte{0b_1110_0000},
0, 0, 3,
[]byte{0b_1110_0000},
)
test(
[]byte{0b_1111_1011},
[]byte{0b_0010_0000},
0, 0, 4,
[]byte{0b_0010_1011},
)
test(
[]byte{0b_1111_1111},
[]byte{0b_0001_0011},
0, 0, 5,
[]byte{0b_0001_0111},
)
test(
[]byte{0b_1111_1111, 0b_0000_1111},
[]byte{0b_0010_0000, 0b_1111_0000},
3, 0, 4,
[]byte{0b_1110_0101, 0b_0000_1111},
)
test(
[]byte{0b_1111_1111, 0b_1111_1111, 0b_1111_1111, 0b_1111_1111, 0b_1111_1111},
[]byte{0b_0000_0000, 0b_0000_0000, 0b_0000_0000, 0b_0000_0000, 0b_0000_0000},
10, 10, 12,
[]byte{0b_1111_1111, 0b_1100_0000, 0b_0000_0011, 0b_1111_1111, 0b_1111_1111},
)
test(
[]byte{0b_0000_0000, 0b_0000_0000, 0b_0000_0000, 0b_0000_0000, 0b_0000_0000},
[]byte{0b_1111_1111, 0b_1111_1111, 0b_1111_1111, 0b_1111_1111, 0b_1111_1111},
8, 8, 12,
[]byte{0b_0000_0000, 0b_1111_1111, 0b_1111_0000, 0b_0000_0000, 0b_0000_0000},
)
test(
[]byte{0b_1111_1010, 0b_0000_0000, 0b_0000_0000, 0b_0000_0000, 0b_0000_1111},
[]byte{0b_0000_0111, 0b_1111_1111, 0b_1111_1111, 0b_1111_1111, 0b_1111_1111},
11, 5, 22,
[]byte{0b_1111_1010, 0b_0001_1111, 0b_1111_1111, 0b_1111_1111, 0b_1000_1111},
)
}
func mkBitsStr(b []byte) string {
s := ""
for _, be := range b {
s += fmt.Sprintf("%08b", be)
}
return s
}
func mkRandBits() []byte {
b := make([]byte, 1+rand.Intn(8)) // len = 1..8
rand.Read(b)
return b
}
func dupBits(b []byte) []byte {
d := make([]byte, len(b))
copy(d, b)
return d
}
func sfmt(s string) string {
f := make([]string, (len(s)+7)>>3)
for i := 0; i < len(f); i++ {
f[i] = s[i<<3 : (i+1)<<3]
}
return fmt.Sprintf("[%s]", strings.Join(f, " "))
}
func TestCopyBitsB_rand(t *testing.T) {
const testIterations = 50000
rand.Seed(time.Now().UnixNano())
for i := 0; i < testIterations; i++ {
dstB, srcB := mkRandBits(), mkRandBits()
dstS, srcS := mkBitsStr(dstB), mkBitsStr(srcB)
orgB := dupBits(dstB)
orgS := mkBitsStr(orgB)
wid := len(dstS)
if len(srcS) < wid {
wid = len(srcS)
}
nBits := rand.Intn(wid) + 1
dst0 := rand.Intn(len(dstS) - nBits + 1)
src0 := rand.Intn(len(srcS) - nBits + 1)
subpS := srcS[src0 : src0+nBits]
wantS := orgS[:dst0] + subpS + orgS[dst0+nBits:]
gotZF := bitarray.CopyBitsB(dstB, srcB, dst0, src0, nBits)
dstS = mkBitsStr(dstB)
if gotZF && strings.Contains(subpS, "1") {
t.Errorf("unexpected ZF: true for %q", subpS)
}
if dstS != wantS {
t.Errorf("unexpected result: dstOff=%d, srcOff=%d, nBits=%d", dst0, src0, nBits)
}
if t.Failed() {
t.Logf(" dst: %08b", orgB)
t.Logf(" src: %08b", srcB)
t.Logf(" got: %08b", dstB)
t.Logf("want: %s", sfmt(wantS))
t.FailNow()
}
// if i < 30 {
// t.Logf("pass: dstOff=%d, srcOff=%d, nBits=%d", dst0, src0, nBits)
// t.Logf(" dst: %08b", orgB)
// t.Logf(" src: %08b", srcB)
// t.Logf(" got: %08b", dstB)
// }
}
}
func TestClearBits(t *testing.T) {
test := func(
dst []byte,
off, nBits int,
exp []byte,
) {
t.Helper()
org := make([]byte, len(dst))
copy(org, dst)
bitarray.ClearBits(dst, off, nBits)
if !bytes.Equal(dst, exp) {
t.Error("unexpected result:")
t.Logf("off=%d, nBits=%d", off, nBits)
t.Logf(" dst: %08b", org)
t.Logf(" got: %08b", dst)
t.Logf("want: %08b", exp)
t.FailNow()
}
}
test(
[]byte{0b_1111_1111},
0, 1,
[]byte{0b_0111_1111},
)
test(
[]byte{0b_1111_1111},
0, 3,
[]byte{0b_0001_1111},
)
test(
[]byte{0b_1111_1111},
5, 2,
[]byte{0b_1111_1001},
)
test(
[]byte{0b_1111_1111},
7, 1,
[]byte{0b_1111_1110},
)
test(
[]byte{0b_1111_1111, 0b_1111_1111},
4, 3,
[]byte{0b_1111_0001, 0b_1111_1111},
)
test(
[]byte{0b_1111_1111, 0b_1111_1111},
5, 3,
[]byte{0b_1111_1000, 0b_1111_1111},
)
test(
[]byte{0b_1111_1111, 0b_1111_1111},
5, 4,
[]byte{0b_1111_1000, 0b_0111_1111},
)
test(
[]byte{0b_1111_1111, 0b_1111_1111},
7, 1,
[]byte{0b_1111_1110, 0b_1111_1111},
)
test(
[]byte{0b_1111_1111, 0b_1111_1111, 0b_1111_1111, 0b_1111_1111, 0b_1111_1111},
8, 8,
[]byte{0b_1111_1111, 0b_0000_0000, 0b_1111_1111, 0b_1111_1111, 0b_1111_1111},
)
test(
[]byte{0b_1111_1111, 0b_1111_1111, 0b_1111_1111, 0b_1111_1111, 0b_1111_1111},
6, 21,
[]byte{0b_1111_1100, 0b_0000_0000, 0b_0000_0000, 0b_0001_1111, 0b_1111_1111},
)
}
func TestClearBits_rand(t *testing.T) {
const testIterations = 50000
rand.Seed(time.Now().UnixNano())
for i := 0; i < testIterations; i++ {
dstB := mkRandBits()
dstS := mkBitsStr(dstB)
orgB := dupBits(dstB)
orgS := mkBitsStr(orgB)
nBits := rand.Intn(len(dstS)) + 1
dst0 := rand.Intn(len(dstS) - nBits + 1)
wantS := orgS[:dst0] + strings.Repeat("0", nBits) + orgS[dst0+nBits:]
bitarray.ClearBits(dstB, dst0, nBits)
dstS = mkBitsStr(dstB)
if dstS != wantS {
t.Errorf("unexpected result: off=%d, nBits=%d", dst0, nBits)
t.Logf(" dst: %08b", orgB)
t.Logf(" got: %08b", dstB)
t.Logf("want: %s", sfmt(wantS))
t.FailNow()
}
// if i < 30 {
// t.Logf("pass: off=%d, nBits=%d", dst0, nBits)
// t.Logf(" dst: %08b", orgB)
// t.Logf(" got: %08b", dstB)
// }
}
}
func TestSetBits_rand(t *testing.T) {
const testIterations = 50000
rand.Seed(time.Now().UnixNano())
for i := 0; i < testIterations; i++ {
dstB := mkRandBits()
dstS := mkBitsStr(dstB)
orgB := dupBits(dstB)
orgS := mkBitsStr(orgB)
nBits := rand.Intn(len(dstS)) + 1
dst0 := rand.Intn(len(dstS) - nBits + 1)
wantS := orgS[:dst0] + strings.Repeat("1", nBits) + orgS[dst0+nBits:]
bitarray.SetBits(dstB, dst0, nBits)
dstS = mkBitsStr(dstB)
if dstS != wantS {
t.Errorf("unexpected result: off=%d, nBits=%d", dst0, nBits)
t.Logf(" dst: %08b", orgB)
t.Logf(" got: %08b", dstB)
t.Logf("want: %s", sfmt(wantS))
t.FailNow()
}
// if i < 30 {
// t.Logf("pass: off=%d, nBits=%d", dst0, nBits)
// t.Logf(" dst: %08b", orgB)
// t.Logf(" got: %08b", dstB)
// }
}
}
func TestToggleBits_rand(t *testing.T) {
const testIterations = 50000
rand.Seed(time.Now().UnixNano())
for i := 0; i < testIterations; i++ {
dstB := mkRandBits()
dstS := mkBitsStr(dstB)
orgB := dupBits(dstB)
orgS := mkBitsStr(orgB)
nBits := rand.Intn(len(dstS)) + 1
dst0 := rand.Intn(len(dstS) - nBits + 1)
mapfn := func(r rune) rune {
switch r {
case '0':
return '1'
case '1':
return '0'
}
return r
}
subpS := strings.Map(mapfn, dstS[dst0:dst0+nBits])
wantS := orgS[:dst0] + subpS + orgS[dst0+nBits:]
bitarray.ToggleBits(dstB, dst0, nBits)
dstS = mkBitsStr(dstB)
if dstS != wantS {
t.Errorf("unexpected result: off=%d, nBits=%d", dst0, nBits)
t.Logf(" dst: %08b", orgB)
t.Logf(" got: %08b", dstB)
t.Logf("want: %s", sfmt(wantS))
t.FailNow()
}
// if i < 30 {
// t.Logf("pass: off=%d, nBits=%d", dst0, nBits)
// t.Logf(" dst: %08b", orgB)
// t.Logf(" got: %08b", dstB)
// }
}
}
func TestAndBits_rand(t *testing.T) {
const testIterations = 50000
rand.Seed(time.Now().UnixNano())
for i := 0; i < testIterations; i++ {
dstB, srcB := mkRandBits(), mkRandBits()
dstS, srcS := mkBitsStr(dstB), mkBitsStr(srcB)
orgB := dupBits(dstB)
orgS := mkBitsStr(orgB)
wid := len(dstS)
if len(srcS) < wid {
wid = len(srcS)
}
nBits := rand.Intn(wid) + 1
dst0 := rand.Intn(len(dstS) - nBits + 1)
src0 := rand.Intn(len(srcS) - nBits + 1)
subpS := ""
for i := 0; i < nBits; i++ {
switch dstS[dst0+i:dst0+i+1] + srcS[src0+i:src0+i+1] {
case "11":
subpS += "1"
default:
subpS += "0"
}
}
wantS := orgS[:dst0] + subpS + orgS[dst0+nBits:]
bitarray.AndBits(dstB, srcB, dst0, src0, nBits)
dstS = mkBitsStr(dstB)
if dstS != wantS {
t.Errorf("unexpected result: dstOff=%d, srcOff=%d, nBits=%d", dst0, src0, nBits)
t.Logf(" dst: %08b", orgB)
t.Logf(" src: %08b", srcB)
t.Logf(" got: %08b", dstB)
t.Logf("want: %s", sfmt(wantS))
t.FailNow()
}
// if i < 30 {
// t.Logf("pass: dstOff=%d, srcOff=%d, nBits=%d", dst0, src0, nBits)
// t.Logf(" dst: %08b", orgB)
// t.Logf(" src: %08b", srcB)
// t.Logf(" got: %08b", dstB)
// }
}
}
func TestOrBits_rand(t *testing.T) {
const testIterations = 50000
rand.Seed(time.Now().UnixNano())
for i := 0; i < testIterations; i++ {
dstB, srcB := mkRandBits(), mkRandBits()
dstS, srcS := mkBitsStr(dstB), mkBitsStr(srcB)
orgB := dupBits(dstB)
orgS := mkBitsStr(orgB)
wid := len(dstS)
if len(srcS) < wid {
wid = len(srcS)
}
nBits := rand.Intn(wid) + 1
dst0 := rand.Intn(len(dstS) - nBits + 1)
src0 := rand.Intn(len(srcS) - nBits + 1)
subpS := ""
for i := 0; i < nBits; i++ {
switch dstS[dst0+i:dst0+i+1] + srcS[src0+i:src0+i+1] {
case "00":
subpS += "0"
default:
subpS += "1"
}
}
wantS := orgS[:dst0] + subpS + orgS[dst0+nBits:]
bitarray.OrBits(dstB, srcB, dst0, src0, nBits)
dstS = mkBitsStr(dstB)
if dstS != wantS {
t.Errorf("unexpected result: dstOff=%d, srcOff=%d, nBits=%d", dst0, src0, nBits)
t.Logf(" dst: %08b", orgB)
t.Logf(" src: %08b", srcB)
t.Logf(" got: %08b", dstB)
t.Logf("want: %s", sfmt(wantS))
t.FailNow()
}
// if i < 30 {
// t.Logf("pass: dstOff=%d, srcOff=%d, nBits=%d", dst0, src0, nBits)
// t.Logf(" dst: %08b", orgB)
// t.Logf(" src: %08b", srcB)
// t.Logf(" got: %08b", dstB)
// }
}
}
func TestXorBits_rand(t *testing.T) {
const testIterations = 50000
rand.Seed(time.Now().UnixNano())
for i := 0; i < testIterations; i++ {
dstB, srcB := mkRandBits(), mkRandBits()
dstS, srcS := mkBitsStr(dstB), mkBitsStr(srcB)
orgB := dupBits(dstB)
orgS := mkBitsStr(orgB)
wid := len(dstS)
if len(srcS) < wid {
wid = len(srcS)
}
nBits := rand.Intn(wid) + 1
dst0 := rand.Intn(len(dstS) - nBits + 1)
src0 := rand.Intn(len(srcS) - nBits + 1)
subpS := ""
for i := 0; i < nBits; i++ {
switch dstS[dst0+i:dst0+i+1] + srcS[src0+i:src0+i+1] {
case "01", "10":
subpS += "1"
default:
subpS += "0"
}
}
wantS := orgS[:dst0] + subpS + orgS[dst0+nBits:]
bitarray.XorBits(dstB, srcB, dst0, src0, nBits)
dstS = mkBitsStr(dstB)
if dstS != wantS {
t.Errorf("unexpected result: dstOff=%d, srcOff=%d, nBits=%d", dst0, src0, nBits)
t.Logf(" dst: %08b", orgB)
t.Logf(" src: %08b", srcB)
t.Logf(" got: %08b", dstB)
t.Logf("want: %s", sfmt(wantS))
t.FailNow()
}
// if i < 30 {
// t.Logf("pass: dstOff=%d, srcOff=%d, nBits=%d", dst0, src0, nBits)
// t.Logf(" dst: %08b", orgB)
// t.Logf(" src: %08b", srcB)
// t.Logf(" got: %08b", dstB)
// }
}
}