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eazy_test.go
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eazy_test.go
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package eazy
import (
"bytes"
"encoding/hex"
"flag"
"fmt"
"io"
"math/rand"
"os"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
type (
ByteCounter int64
Buf []byte
BufReader struct {
Buf
R int
}
)
var (
fileFlag = flag.String("tlog-file", "log.tlog", "file with tlog logs")
ratioEstimator = flag.Int("ratio-estimator", 0, "ratio estimator iterations to run")
)
var (
testData []byte
testOff []int
testsCount int
)
func TestMagic(t *testing.T) {
var buf Buf
w := NewWriter(&buf, MiB, 512)
err := w.WriteHeader()
assert.NoError(t, err)
if assert.True(t, len(buf) >= len(Magic)) {
assert.Equal(t, Magic, string(buf[:len(Magic)]))
}
l := len(buf)
err = w.WriteHeader()
assert.NoError(t, err)
assert.Len(t, buf, l)
_, err = w.Write([]byte{0})
assert.NoError(t, err)
assert.Len(t, buf, l+2)
t.Logf("file header:\n%s", hex.Dump(buf))
}
func TestLiteral(t *testing.T) {
testAllVersions(t, testLiteral)
}
func testLiteral(t *testing.T, ver int) {
const B = 32
var buf Buf
w := NewWriter(&buf, B, B>>1)
w.e.Ver = ver
w.AppendMagic = false
n, err := w.Write([]byte("very_first_message"))
assert.Equal(t, 18, n)
assert.NoError(t, err)
t.Logf("buf pos %x ht %x block\n%v", w.pos, w.ht, hex.Dump(w.block))
t.Logf("res\n%v", hex.Dump(buf))
t.Logf("res\n%v", Dump(buf))
r := NewReaderBytes(buf)
p := make([]byte, 100)
t.Logf("*** read back ***")
n, err = r.Read(p[:10])
assert.NoError(t, err)
assert.Equal(t, 10, n)
assert.Equal(t, []byte("very_first"), p[:n])
copy(p[:10], zeros)
n, err = r.Read(p[:10])
assert.Equal(t, io.EOF, err)
assert.Equal(t, 8, n)
assert.Equal(t, []byte("_message"), p[:n])
}
func TestCopy(t *testing.T) {
testAllVersions(t, testCopy)
}
func testCopy(t *testing.T, ver int) {
const B = 32
var buf Buf
w := NewWriter(&buf, B, B>>1)
w.e.Ver = ver
w.AppendMagic = false
st := 0
n, err := w.Write([]byte("prefix_1234_suffix"))
assert.Equal(t, 18, n)
assert.NoError(t, err)
t.Logf("buf pos %x ht %x\n%v", w.pos, w.ht, hex.Dump(w.block))
t.Logf("res\n%v", hex.Dump(buf[st:]))
st = len(buf)
n, err = w.Write([]byte("prefix_567_suffix"))
assert.Equal(t, 17, n)
assert.NoError(t, err)
t.Logf("buf pos %x ht %x\n%v", w.pos, w.ht, hex.Dump(w.block))
t.Logf("res\n%v", hex.Dump(buf[st:]))
t.Logf("res\n%v", Dump(buf))
r := NewReaderBytes(buf)
p := make([]byte, 100)
t.Logf("*** read back ***")
n, err = r.Read(p[:10])
assert.Equal(t, 10, n)
assert.NoError(t, err)
assert.Equal(t, []byte("prefix_123"), p[:n])
t.Logf("buf pos %x\n%v", r.pos, hex.Dump(r.block))
n, err = r.Read(p[:10])
assert.Equal(t, 10, n)
assert.NoError(t, err)
assert.Equal(t, []byte("4_suffixpr"), p[:n])
t.Logf("buf pos %x\n%v", r.pos, hex.Dump(r.block))
n, err = r.Read(p[:30])
assert.Equal(t, 15, n)
assert.Equal(t, io.EOF, err)
assert.Equal(t, []byte("efix_567_suffix"), p[:n])
t.Logf("buf pos %x\n%v", r.pos, hex.Dump(r.block))
var exp Buf
wexp := NewWriter(&exp, B, B>>1)
wexp.e.Ver = ver
wexp.AppendMagic = false
n, err = wexp.Write([]byte("prefix_1234_suffix"))
assert.NoError(t, err)
assert.Equal(t, 18, n)
_, _ = exp.Write([]byte{Copy | 7, 0x12 - 7})
_, _ = exp.Write([]byte{Literal | 3, '5', '6', '7'})
_, _ = exp.Write([]byte{Copy | 7, 0x11 - 7})
assert.Equal(t, Dump(exp), Dump(buf))
// t.Logf("compression ratio: %.3f", float64(18+17)/float64(len(buf)))
}
func TestBug1(t *testing.T) {
var b bytes.Buffer
p := make([]byte, 1000)
r := NewReader(&b)
// tl.Printw("first")
_, _ = b.Write([]byte{Meta, MetaReset | 0, 14}) //nolint:staticcheck
_, _ = b.Write([]byte{Literal | 3, 0x94, 0xa8, 0xfb, Copy | 9})
n, err := r.Read(p)
assert.ErrorIs(t, err, io.ErrUnexpectedEOF)
assert.Equal(t, 3, n)
// tl.Printw("second")
_, _ = b.Write([]byte{0xfd, 0x03, 0x65}) // offset
n, err = r.Read(p)
assert.ErrorIs(t, err, ErrOverflow)
assert.Equal(t, 0, n)
}
func TestPadding(t *testing.T) {
const B = 32
var buf Buf
w := NewWriter(&buf, B, B>>1)
st := 0
n, err := w.Write([]byte("prefix_1234_suffix"))
assert.Equal(t, 18, n)
assert.NoError(t, err)
t.Logf("buf pos %x ht %x\n%v", w.pos, w.ht, hex.Dump(w.block))
t.Logf("res\n%v", hex.Dump(buf[st:]))
st = len(buf)
buf = append(buf, make([]byte, B-len(buf)%B)...)
n, err = w.Write([]byte("prefix_567_suffix"))
assert.Equal(t, 17, n)
assert.NoError(t, err)
t.Logf("buf pos %x ht %x\n%v", w.pos, w.ht, hex.Dump(w.block))
t.Logf("res\n%v", hex.Dump(buf[st:]))
t.Logf("res\n%v", Dump(buf))
r := &Reader{
b: buf,
}
p := make([]byte, 100)
t.Logf("*** read back ***")
n, err = r.Read(p[:10])
assert.Equal(t, 10, n)
assert.NoError(t, err)
assert.Equal(t, []byte("prefix_123"), p[:n])
t.Logf("buf pos %x\n%v", r.pos, hex.Dump(r.block))
n, err = r.Read(p[:10])
assert.Equal(t, 10, n)
assert.NoError(t, err)
assert.Equal(t, []byte("4_suffixpr"), p[:n])
t.Logf("buf pos %x\n%v", r.pos, hex.Dump(r.block))
n, err = r.Read(p[:30])
assert.Equal(t, 15, n)
assert.Equal(t, io.EOF, err)
assert.Equal(t, []byte("efix_567_suffix"), p[:n])
t.Logf("buf pos %x\n%v", r.pos, hex.Dump(r.block))
// t.Logf("compression ratio: %.3f", float64(18+17)/float64(len(buf)))
}
func TestZeroRegion(t *testing.T) {
b := []byte{Meta, MetaReset, 2, Meta, MetaVer, 0, Copy | 10, OffLong, 0}
r := NewReaderBytes(b)
p := make([]byte, 16)
copy(p, "some garbage")
n, err := r.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, zeros[:10], p[:n])
}
func TestReset(t *testing.T) {
var b [5]BufReader
w := NewWriter(&b[0], 1024, 32)
_, err := w.Write([]byte("some_message"))
assert.NoError(t, err)
w.Reset(&b[1])
_, err = w.Write([]byte("another_message"))
assert.NoError(t, err)
w.ResetSize(&b[2], 2048, 64)
_, err = w.Write([]byte("third_message"))
assert.NoError(t, err)
w.ResetSize(&b[3], 512, 16)
_, err = w.Write([]byte("fourth_message"))
assert.NoError(t, err)
w.ResetSize(&b[4], 1024, 32)
_, err = w.Write([]byte("fifth_message"))
assert.NoError(t, err)
r := NewReader(&b[0])
p := make([]byte, 0x20)
n, err := r.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, "some_message", string(p[:n]))
r.Reset(&b[1])
n, err = r.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, "another_message", string(p[:n]))
r.ResetBytes(b[2].Buf)
n, err = r.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, "third_message", string(p[:n]))
r.ResetBytes(b[3].Buf)
n, err = r.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, "fourth_message", string(p[:n]))
r.Reset(&b[4])
n, err = r.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, "fifth_message", string(p[:n]))
}
func TestBreak(t *testing.T) {
const B = 32
var buf Buf
w := NewWriter(&buf, B, B>>1)
// w.e.Ver = ver
w.AppendMagic = false
_, err := w.Write([]byte("message1"))
assert.NoError(t, err)
err = w.WriteBreak()
assert.NoError(t, err)
_, err = w.Write([]byte("qwessage2"))
assert.NoError(t, err)
r := NewReaderBytes(buf)
p := make([]byte, 20)
n, err := r.Read(p)
assert.ErrorIs(t, err, ErrBreak)
assert.Equal(t, []byte("message1"), p[:n])
n, err = r.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, []byte("qwessage2"), p[:n])
//
buf = buf[:0]
w.Reset(&buf)
err = w.WriteBreak()
assert.NoError(t, err)
r.ResetBytes(buf)
n, err = r.Read(p)
assert.ErrorIs(t, err, ErrBreak)
assert.Equal(t, 0, n)
n, err = r.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, 0, n)
//
buf = buf[:0]
w.Reset(&buf)
_, err = w.Write([]byte("123"))
assert.NoError(t, err)
err = w.WriteBreak()
assert.NoError(t, err)
r.ResetBytes(buf)
n, err = r.Read(p[:3])
assert.NoError(t, err)
assert.Equal(t, []byte("123"), p[:n])
n, err = r.Read(p)
assert.ErrorIs(t, err, ErrBreak)
assert.Equal(t, 0, n)
n, err = r.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, 0, n)
}
func TestReaderRequireMagic(t *testing.T) {
var b BufReader
w := NewWriter(&b, 1024, 32)
w.AppendMagic = false
_, err := w.Write([]byte{0})
assert.NoError(t, err)
r := NewReader(&b)
r.RequireMagic = true
_, err = r.Read([]byte{0})
assert.ErrorIs(t, err, ErrNoMagic)
}
func TestFlush(t *testing.T) {
var b BufReader
w := NewWriter(&b, 1024, 32)
w.AppendMagic = false
w.FlushThreshold = -1
err := w.WriteHeader()
assert.NoError(t, err)
n, err := w.Write([]byte("aaabbb"))
assert.NoError(t, err)
assert.Equal(t, 6, n)
err = w.WriteBreak()
assert.NoError(t, err)
n, err = w.Write([]byte("ccc"))
assert.NoError(t, err)
assert.Equal(t, 3, n)
assert.Equal(t, 0, b.Len())
err = w.Flush()
assert.NoError(t, err)
assert.Equal(t, 16, b.Len())
err = w.WriteBreak()
assert.NoError(t, err)
assert.Equal(t, 16, b.Len())
err = w.Flush()
assert.NoError(t, err)
assert.Equal(t, Buf{
Meta, MetaReset, 10,
Literal | 6, 'a', 'a', 'a', 'b', 'b', 'b',
Meta, MetaBreak | MetaLen0,
Literal | 3, 'c', 'c', 'c',
Meta, MetaBreak | MetaLen0,
}, b.Buf)
r := NewReader(&b)
p := make([]byte, 10)
n, err = r.Read(p)
assert.ErrorIs(t, err, ErrBreak)
assert.Equal(t, []byte("aaabbb"), p[:n])
n, err = r.Read(p)
assert.ErrorIs(t, err, ErrBreak)
assert.Equal(t, []byte("ccc"), p[:n])
n, err = r.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, 0, n)
}
func TestFlushReset(t *testing.T) {
var b BufReader
w := NewWriter(&b, 1024, 32)
w.AppendMagic = false
w.FlushThreshold = -1
_, err := w.Write([]byte("123"))
assert.NoError(t, err)
assert.Equal(t, 0, b.Len())
w.Reset(w.Writer)
w.FlushThreshold = 0
_, err = w.Write([]byte("456"))
assert.NoError(t, err)
assert.Equal(t, Buf{Meta, MetaReset, 10, Literal | 3, '4', '5', '6'}, b.Buf)
}
func TestIntersectionLong(t *testing.T) {
testIntersection(t, func(rnd *rand.Rand, msg []byte) []byte {
msg2 := make([]byte, 0x20)
for i := range msg2[:0x10] {
msg2[i] = ' ' + byte(rnd.Intn(0x78-0x20))
}
copy(msg2[0x10:], msg[:0x10])
return msg2
})
}
func TestIntersectionShort(t *testing.T) {
testIntersection(t, func(rnd *rand.Rand, msg []byte) []byte {
msg2 := make([]byte, 0x20)
copy(msg2[:0x10], msg[len(msg)-0x10:])
copy(msg2[0x10:], msg[:0x10])
return msg2
})
}
func testIntersection(t *testing.T, msg2f func(rnd *rand.Rand, msg []byte) []byte) {
rnd := rand.New(rand.NewSource(0))
var enc Buf
w := NewWriter(&enc, 1024, 512)
msg := make([]byte, len(w.block))
for i := range msg {
msg[i] = ' ' + byte(rnd.Intn(0x78-0x20))
}
n, err := w.Write(msg)
assert.NoError(t, err)
assert.Equal(t, len(msg), n)
require.Equal(t, msg, w.block)
msg2 := msg2f(rnd, msg)
n, err = w.Write(msg2)
assert.NoError(t, err)
assert.Equal(t, len(msg2), n)
// read
r := NewReaderBytes(enc)
ll := len(msg) + len(msg2)
res := make([]byte, ll+10)
n, err = r.Read(res)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, ll, n)
assert.Equal(t, msg, res[:len(msg)])
assert.Equal(t, msg2, res[len(msg):ll])
t.Logf("dump\n%s", Dump(enc))
}
func TestRunlenDecoder(t *testing.T) {
var b BufReader
p := make([]byte, 1000)
d := NewReader(&b)
_, _ = b.Write([]byte{Meta, MetaReset | 0, 4}) //nolint:staticcheck
_, _ = b.Write([]byte{Meta, MetaVer | 0, 0}) //nolint:staticcheck
_, _ = b.Write([]byte{Literal | 1, 'a', Copy | 5, OffLong, 1})
_, _ = b.Write([]byte{Literal | 2, 'b', 'c', Copy | 5, OffLong, 2})
_, _ = b.Write([]byte{Literal | 2, 'x', 'x'})
n, err := d.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, 15, n)
assert.Equal(t, []byte("aaaaaabcbcbcbxx"), p[:n])
}
func TestRunlenEncoder(t *testing.T) {
var b Buf
w := NewWriter(&b, 128, 16)
n, err := w.Write([]byte{0})
assert.NoError(t, err)
assert.Equal(t, 1, n)
n, err = w.Write([]byte("aaaaaaabcbcbcbcbxx"))
assert.NoError(t, err)
assert.Equal(t, 18, n)
var exp Buf
n, err = NewWriter(&exp, 128, 16).Write([]byte{0})
assert.NoError(t, err)
assert.Equal(t, 1, n)
off := len(exp)
_, _ = exp.Write([]byte{Literal | 1, 'a', Copy | 6, OffLong, 1})
_, _ = exp.Write([]byte{Literal | 2, 'b', 'c', Copy | 7, OffLong, 2})
_, _ = exp.Write([]byte{Literal | 2, 'x', 'x'})
if !assert.Equal(t, Dump(exp[off:]), Dump(b[off:])) {
t.Logf("dump\n%s", Dump(b))
return
}
//
data := make([]byte, 0x1005)
for i := 0; i < len(data); {
i += copy(data[i:], "00000000000000000000000000000000")
}
n, err = w.Write(data)
assert.NoError(t, err)
assert.Equal(t, 0x1005, n)
off = len(exp)
enclen := 0x1005 - 1 - Len1 - 0x100
_, _ = exp.Write([]byte{Literal | 1, '0', Copy | Len2, byte(enclen), byte(enclen >> 8), OffLong, 1})
if !assert.Equal(t, Dump(exp[off:]), Dump(b[off:])) {
t.Logf("dump\n%s", Dump(b))
return
}
//
for i := 3; i < len(data); {
i += copy(data[i:], zeros)
}
n, err = w.Write(data)
assert.NoError(t, err)
assert.Equal(t, 0x1005, n)
off = len(exp)
enclen = 0x1005 - 3 - Len1 - 0x100
_, _ = exp.Write([]byte{Literal | 3, '0', '0', '0', Copy | Len2, byte(enclen), byte(enclen >> 8), OffLong, 0})
if !assert.Equal(t, Dump(exp[off:]), Dump(b[off:])) {
t.Logf("dump\n%s", Dump(b))
return
}
}
func TestGiantLiteral(t *testing.T) {
t.Run("NoCopies", func(t *testing.T) {
testGiantLiteral(t, func(rnd *rand.Rand, bs int) []byte {
msg := make([]byte, 2*bs)
for i := range msg {
msg[i] = ' ' + byte(rnd.Intn(0x78-0x20))
}
return msg
})
})
t.Run("LongCopy", func(t *testing.T) {
testGiantLiteral(t, func(rnd *rand.Rand, bs int) []byte {
msg := make([]byte, 2*bs)
for i := range msg {
msg[i] = ' ' + byte(rnd.Intn(0x78-0x20))
}
cp := "0123456789abcdefgh"
copy(msg, cp)
copy(msg[len(msg)-len(cp):], cp)
return msg
})
})
t.Run("ShortCopy", func(t *testing.T) {
testGiantLiteral(t, func(rnd *rand.Rand, bs int) []byte {
msg := make([]byte, 2*bs)
for i := range msg {
msg[i] = ' ' + byte(rnd.Intn(0x78-0x20))
}
cp := "0123456789abcdefgh"
copy(msg, cp)
copy(msg[len(msg)-len(cp):], cp)
copy(msg[len(msg)-bs+3:], cp)
return msg
})
})
}
func testGiantLiteral(t *testing.T, f func(rnd *rand.Rand, bs int) []byte) {
var b Buf
rnd := rand.New(rand.NewSource(0))
w := NewWriter(&b, 1024, 512)
msg := f(rnd, len(w.block))
n, err := w.Write(msg)
assert.NoError(t, err)
assert.Equal(t, len(msg), n)
t.Logf("dump\n%s", Dump(b))
r := NewReaderBytes(b)
p := make([]byte, len(msg))
n, err = r.Read(p)
assert.NoError(t, err)
assert.Equal(t, len(p), n)
if !assert.True(t, bytes.Equal(msg, p)) {
assert.Equal(t, msg, p)
}
}
func TestUnsupportedVersion(t *testing.T) {
var b Buf
w := NewWriter(&b, 1024, 32)
w.e.Ver = Version + 1
_, _ = w.Write([]byte{1, 2})
r := NewReaderBytes(b)
n, err := r.Read([]byte{1})
assert.ErrorIs(t, err, ErrUnsupportedVersion)
assert.Zero(t, n)
}
func TestMeta(t *testing.T) {
const someMeta = MetaTagMask
var b Buf
w := NewWriter(&b, 1024, 32)
w.AppendMagic = false
_, err := w.Write([]byte{1})
assert.NoError(t, err)
b = w.e.Meta(b, someMeta, 0)
b = w.e.Meta(b, someMeta, 4)
b = append(b, 1, 2, 3, 4)
b = w.e.Meta(b, someMeta, 128)
st := len(b)
b = append(b, make([]byte, 128)...)
copy(b[st:], "0123456789")
copy(b[len(b)-10:], "9876543210")
b = w.e.Meta(b, someMeta, 256)
st = len(b)
b = append(b, make([]byte, 256)...)
copy(b[st:], "abcdef")
copy(b[len(b)-10:], "fedcba")
_, err = w.Write([]byte{2})
assert.NoError(t, err)
r := NewReaderBytes(b)
r.SkipUnsupportedMeta = true
p := make([]byte, 3)
n, err := r.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, []byte{1, 2}, p[:n])
t.Logf("dump\n%s", Dump(b))
if t.Failed() {
t.Logf("dump\n%s", hex.Dump(b))
}
assert.Panics(t, func() { w.e.Meta(nil, 1024, 4) })
}
func TestLongLenOff(t *testing.T) {
testAllVersions(t, testLongLenOff)
}
func testLongLenOff(t *testing.T, ver int) {
var b BufReader
w := NewWriter(&b, 1<<18, 1<<16)
w.e.Ver = ver
rnd := rand.New(rand.NewSource(0))
msg := make([]byte, 1<<17)
for i := range msg {
msg[i] = ' ' + byte(rnd.Intn(0x78-0x20))
}
_, err := w.Write(msg)
assert.NoError(t, err)
r := NewReader(&b)
p := make([]byte, len(msg)+1)
n, err := r.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, msg, p[:n])
for i := range msg[128:] {
msg[128+i] = ' ' + byte(rnd.Intn(0x78-0x20))
}
_, err = w.Write(msg)
assert.NoError(t, err)
n, err = r.Read(p)
assert.ErrorIs(t, err, io.EOF)
assert.Equal(t, msg, p[:n])
}
func TestReaderShortBuffer(t *testing.T) {
var b []byte
var e Encoder
var d Decoder
t.Run("Tag", func(t *testing.T) {
for _, tlen := range []int{20, 0x100, 0x200, 0x5000_0000} {
b = e.Tag(b[:0], Copy, tlen)
t.Logf("len %#10x encoded as % #x", tlen, b)
for i := 0; i < len(b); i++ {
tag, _, j, err := d.Tag(b[:i], 0)
assert.ErrorIs(t, err, ErrShortBuffer)
assert.Equal(t, 0, j)
if i > 0 {
assert.Equal(t, Copy, tag)
}
}
tag, l, j, err := d.Tag(b, 0)
assert.NoError(t, err)
assert.Equal(t, len(b), j)
assert.Equal(t, Copy, tag)
assert.Equal(t, tlen, l)
if t.Failed() {
return
}
}
assert.Panics(t, func() {
b = e.Tag(b[:0], Literal, 0x1_1000_0000)
})
b = append(b[:0], Literal|LenAlt)
tag, _, j, err := d.Tag(b, 0)
assert.ErrorIs(t, err, ErrOverflow)
assert.Equal(t, 0, j)
assert.Equal(t, Literal, tag)
})
t.Run("Offset", func(t *testing.T) {
const tlen = 10
for _, toff := range []int{20, 0x100, 0x200, 0x500, 0x5000_0000} {
b = e.Offset(b[:0], toff, tlen)
t.Logf("off %#10x encoded as % #x", toff, b)
for i := 0; i < len(b); i++ {
_, j, err := d.Offset(b[:i], 0, tlen)
assert.ErrorIs(t, err, ErrShortBuffer)
assert.Equal(t, 0, j)
}
off, j, err := d.Offset(b, 0, tlen)
assert.NoError(t, err)
assert.Equal(t, len(b), j)
assert.Equal(t, toff, off)
if t.Failed() {
return
}
}
for _, toff := range []int{20, 0x100, 0x200, 0x500, 0x5000_0000} {
b = e.Offset(b[:0], toff, toff+tlen)
t.Logf("long off %#10x encoded as % #x", toff, b)
for i := 0; i < len(b); i++ {
_, j, err := d.Offset(b[:i], 0, toff+tlen)
assert.ErrorIs(t, err, ErrShortBuffer)
assert.Equal(t, 0, j)
}
off, j, err := d.Offset(b, 0, toff+tlen)
assert.NoError(t, err)
assert.Equal(t, len(b), j)
assert.Equal(t, toff, off)
if t.Failed() {
return
}
}
assert.Panics(t, func() {
b = e.Offset(b[:0], 0x1_1000_0000, tlen)
})
})
t.Run("Meta", func(t *testing.T) {
const meta = 10 << 3
for _, tlen := range []int{0, 4, 0x80, 0x100, 0x200, 0x500, 0x5000_0000} {
b = e.Meta(b[:0], meta, tlen)
t.Logf("meta len %#10x encoded as % #x", tlen, b)
for i := 1; i < len(b); i++ {
tag, _, j, err := d.Meta(b[:i], 1)
assert.ErrorIs(t, err, ErrShortBuffer)
assert.Equal(t, 1, j)
if i > 1 {
assert.Equal(t, meta, tag)
}
}
tag, l, j, err := d.Meta(b, 1)
assert.NoError(t, err)
assert.Equal(t, len(b), j)
assert.Equal(t, meta, tag)
assert.Equal(t, tlen, l)
if t.Failed() {
return
}
}
})
}
func TestDumper(t *testing.T) {
var b BufReader
w := NewWriter(&b, 1024, 32)
_, _ = w.Write([]byte("some message"))
_ = w.WriteBreak()
b.Buf = append(b.Buf, 0, 0, 0)
_, _ = w.Write([]byte("again some message"))
var b2, b3 Buf
d := NewDumper(&b2)
d.Debug = func(ipos, iend, opos int64, tag byte, l, x int) {
dl := 0
if tag == 'l' || tag == 'm' {
dl = l
}
b3 = fmt.Appendf(b3, "%4x %4x %q %3x %3x %2v %v\n", ipos, opos, tag, l, x>>3, fmtbuf(b.Buf[ipos:iend]), fmtbuf(b.Buf[iend:int(iend)+dl]))