/usr/share/gocode/src/github.com/influxdata/influxdb/tsdb/engine/tsm1/bit_reader_test.go is in golang-github-influxdb-influxdb-dev 1.1.1+dfsg1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 | package tsm1_test
import (
"bytes"
"io"
"math"
"math/rand"
"reflect"
"testing"
"testing/quick"
"github.com/dgryski/go-bitstream"
"github.com/influxdata/influxdb/tsdb/engine/tsm1"
)
func TestBitStreamEOF(t *testing.T) {
br := tsm1.NewBitReader([]byte("0"))
b, err := br.ReadBits(8)
if b != '0' {
t.Error("ReadBits(8) didn't return first byte")
}
if _, err := br.ReadBits(8); err != io.EOF {
t.Error("ReadBits(8) on empty string didn't return EOF")
}
// 0 = 0b00110000
br = tsm1.NewBitReader([]byte("0"))
buf := bytes.NewBuffer(nil)
bw := bitstream.NewWriter(buf)
for i := 0; i < 4; i++ {
bit, err := br.ReadBit()
if err == io.EOF {
break
}
if err != nil {
t.Error("GetBit returned error err=", err.Error())
return
}
bw.WriteBit(bitstream.Bit(bit))
}
bw.Flush(bitstream.One)
err = bw.WriteByte(0xAA)
if err != nil {
t.Error("unable to WriteByte")
}
c := buf.Bytes()
if len(c) != 2 || c[1] != 0xAA || c[0] != 0x3f {
t.Error("bad return from 4 read bytes")
}
_, err = tsm1.NewBitReader([]byte("")).ReadBit()
if err != io.EOF {
t.Error("ReadBit on empty string didn't return EOF")
}
}
func TestBitStream(t *testing.T) {
buf := bytes.NewBuffer(nil)
br := tsm1.NewBitReader([]byte("hello"))
bw := bitstream.NewWriter(buf)
for {
bit, err := br.ReadBit()
if err == io.EOF {
break
}
if err != nil {
t.Error("GetBit returned error err=", err.Error())
return
}
bw.WriteBit(bitstream.Bit(bit))
}
s := buf.String()
if s != "hello" {
t.Error("expected 'hello', got=", []byte(s))
}
}
func TestByteStream(t *testing.T) {
buf := bytes.NewBuffer(nil)
br := tsm1.NewBitReader([]byte("hello"))
bw := bitstream.NewWriter(buf)
for i := 0; i < 3; i++ {
bit, err := br.ReadBit()
if err == io.EOF {
break
}
if err != nil {
t.Error("GetBit returned error err=", err.Error())
return
}
bw.WriteBit(bitstream.Bit(bit))
}
for i := 0; i < 3; i++ {
byt, err := br.ReadBits(8)
if err == io.EOF {
break
}
if err != nil {
t.Error("ReadBits(8) returned error err=", err.Error())
return
}
bw.WriteByte(byte(byt))
}
u, err := br.ReadBits(13)
if err != nil {
t.Error("ReadBits returned error err=", err.Error())
return
}
bw.WriteBits(u, 13)
bw.WriteBits(('!'<<12)|('.'<<4)|0x02, 20)
// 0x2f == '/'
bw.Flush(bitstream.One)
s := buf.String()
if s != "hello!./" {
t.Errorf("expected 'hello!./', got=%x", []byte(s))
}
}
// Ensure bit reader can read random bits written to a stream.
func TestBitReader_Quick(t *testing.T) {
if err := quick.Check(func(values []uint64, nbits []uint) bool {
// Limit nbits to 64.
for i := 0; i < len(values) && i < len(nbits); i++ {
nbits[i] = (nbits[i] % 64) + 1
values[i] = values[i] & (math.MaxUint64 >> (64 - nbits[i]))
}
// Write bits to a buffer.
var buf bytes.Buffer
w := bitstream.NewWriter(&buf)
for i := 0; i < len(values) && i < len(nbits); i++ {
w.WriteBits(values[i], int(nbits[i]))
}
w.Flush(bitstream.Zero)
// Read bits from the buffer.
r := tsm1.NewBitReader(buf.Bytes())
for i := 0; i < len(values) && i < len(nbits); i++ {
v, err := r.ReadBits(nbits[i])
if err != nil {
t.Errorf("unexpected error(%d): %s", i, err)
return false
} else if v != values[i] {
t.Errorf("value mismatch(%d): got=%d, exp=%d (nbits=%d)", i, v, values[i], nbits[i])
return false
}
}
return true
}, &quick.Config{
Values: func(a []reflect.Value, rand *rand.Rand) {
a[0], _ = quick.Value(reflect.TypeOf([]uint64{}), rand)
a[1], _ = quick.Value(reflect.TypeOf([]uint{}), rand)
},
}); err != nil {
t.Fatal(err)
}
}
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