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compress_test.go
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compress_test.go
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package accelerator
import (
"bytes"
"crypto/rand"
"encoding/binary"
"encoding/hex"
"errors"
"io"
"sync"
"testing"
"github.com/agiledragon/gomonkey/v2"
"github.com/stretchr/testify/require"
)
var (
testEthernet1 = "d8ba1192c572d8af159ac5d10800" // IPv4
testEthernet2 = "d8ba1192c572d8af159ac5d20800" // IPv4
testEthernet3 = "d8ba1192c572d8af159ac5d386dd" // IPv6
testEthernet4 = "d8ba1192c572d8af159ac5d486dd" // IPv6
testIPv4H1 = "450405c8574d40003706b63514983c5fc0a81f0a" // TCP
testIPv4H2 = "450405c8575d40003706b63514983c5fc0a81f0a" // TCP
testIPv4H3 = "450405c8576d40003711b63514983c5fc0a81f0a" // UDP
testIPv4H4 = "450405c8577d40003711b63514983c5fc0a81f0a" // UDP
testIPv6H1 = "6043670105a0062b24108c016c2a103d000000afb00239ab24108a2aa084b4a02127e9cada1240f1" // TCP
testIPv6H2 = "6043670205a0062b24108c016c2a103d000000afb00239ab24108a2aa084b4a02127e9cada1240f1" // TCP
testIPv6H3 = "6043670305a0112b24108c016c2a103d000000afb00239ab24108a2aa084b4a02127e9cada1240f1" // UDP
testIPv6H4 = "6043670405a0112b24108c016c2a103d000000afb00239ab24108a2aa084b4a02127e9cada1240f1" // UDP
testTCPH1 = "01bbebd71561ddfc151e1385501003d037390000"
testTCPH2 = "01bbebd81661ddfc151e1385501003d037390000"
testUDPH1 = "fb7b003500385f66"
testUDPH2 = "fb7b003600385f66"
testIPv4TCPFrameHeader1 = testMustHexDecodeString(testEthernet1 + testIPv4H1 + testTCPH1)
testIPv4TCPFrameHeader2 = testMustHexDecodeString(testEthernet1 + testIPv4H1 + testTCPH2)
testIPv4TCPFrameHeader3 = testMustHexDecodeString(testEthernet1 + testIPv4H2 + testTCPH1)
testIPv4TCPFrameHeader4 = testMustHexDecodeString(testEthernet1 + testIPv4H2 + testTCPH2)
testIPv4TCPFrameHeader5 = testMustHexDecodeString(testEthernet2 + testIPv4H1 + testTCPH1)
testIPv4TCPFrameHeader6 = testMustHexDecodeString(testEthernet2 + testIPv4H1 + testTCPH2)
testIPv4TCPFrameHeader7 = testMustHexDecodeString(testEthernet2 + testIPv4H2 + testTCPH1)
testIPv4TCPFrameHeader8 = testMustHexDecodeString(testEthernet2 + testIPv4H2 + testTCPH2)
testIPv4UDPFrameHeader1 = testMustHexDecodeString(testEthernet1 + testIPv4H3 + testUDPH1)
testIPv4UDPFrameHeader2 = testMustHexDecodeString(testEthernet1 + testIPv4H3 + testUDPH2)
testIPv4UDPFrameHeader3 = testMustHexDecodeString(testEthernet1 + testIPv4H4 + testUDPH1)
testIPv4UDPFrameHeader4 = testMustHexDecodeString(testEthernet1 + testIPv4H4 + testUDPH2)
testIPv4UDPFrameHeader5 = testMustHexDecodeString(testEthernet2 + testIPv4H3 + testUDPH1)
testIPv4UDPFrameHeader6 = testMustHexDecodeString(testEthernet2 + testIPv4H3 + testUDPH2)
testIPv4UDPFrameHeader7 = testMustHexDecodeString(testEthernet2 + testIPv4H4 + testUDPH1)
testIPv4UDPFrameHeader8 = testMustHexDecodeString(testEthernet2 + testIPv4H4 + testUDPH2)
testIPv6TCPFrameHeader1 = testMustHexDecodeString(testEthernet3 + testIPv6H1 + testTCPH1)
testIPv6TCPFrameHeader2 = testMustHexDecodeString(testEthernet3 + testIPv6H1 + testTCPH2)
testIPv6TCPFrameHeader3 = testMustHexDecodeString(testEthernet3 + testIPv6H2 + testTCPH1)
testIPv6TCPFrameHeader4 = testMustHexDecodeString(testEthernet3 + testIPv6H2 + testTCPH2)
testIPv6TCPFrameHeader5 = testMustHexDecodeString(testEthernet4 + testIPv6H1 + testTCPH1)
testIPv6TCPFrameHeader6 = testMustHexDecodeString(testEthernet4 + testIPv6H1 + testTCPH2)
testIPv6TCPFrameHeader7 = testMustHexDecodeString(testEthernet4 + testIPv6H2 + testTCPH1)
testIPv6TCPFrameHeader8 = testMustHexDecodeString(testEthernet4 + testIPv6H2 + testTCPH2)
testIPv6UDPFrameHeader1 = testMustHexDecodeString(testEthernet3 + testIPv6H3 + testUDPH1)
testIPv6UDPFrameHeader2 = testMustHexDecodeString(testEthernet3 + testIPv6H3 + testUDPH2)
testIPv6UDPFrameHeader3 = testMustHexDecodeString(testEthernet3 + testIPv6H4 + testUDPH1)
testIPv6UDPFrameHeader4 = testMustHexDecodeString(testEthernet3 + testIPv6H4 + testUDPH2)
testIPv6UDPFrameHeader5 = testMustHexDecodeString(testEthernet4 + testIPv6H3 + testUDPH1)
testIPv6UDPFrameHeader6 = testMustHexDecodeString(testEthernet4 + testIPv6H3 + testUDPH2)
testIPv6UDPFrameHeader7 = testMustHexDecodeString(testEthernet4 + testIPv6H4 + testUDPH1)
testIPv6UDPFrameHeader8 = testMustHexDecodeString(testEthernet4 + testIPv6H4 + testUDPH2)
)
var testFrameHeaders = [][]byte{
testIPv4TCPFrameHeader1, testIPv4TCPFrameHeader2, testIPv4TCPFrameHeader3, testIPv4TCPFrameHeader4,
testIPv4TCPFrameHeader5, testIPv4TCPFrameHeader6, testIPv4TCPFrameHeader7, testIPv4TCPFrameHeader8,
testIPv4UDPFrameHeader1, testIPv4UDPFrameHeader2, testIPv4UDPFrameHeader3, testIPv4UDPFrameHeader4,
testIPv4UDPFrameHeader5, testIPv4UDPFrameHeader6, testIPv4UDPFrameHeader7, testIPv4UDPFrameHeader8,
testIPv6TCPFrameHeader1, testIPv6TCPFrameHeader2, testIPv6TCPFrameHeader3, testIPv6TCPFrameHeader4,
testIPv6TCPFrameHeader5, testIPv6TCPFrameHeader6, testIPv6TCPFrameHeader7, testIPv6TCPFrameHeader8,
testIPv6UDPFrameHeader1, testIPv6UDPFrameHeader2, testIPv6UDPFrameHeader3, testIPv6UDPFrameHeader4,
testIPv6UDPFrameHeader5, testIPv6UDPFrameHeader6, testIPv6UDPFrameHeader7, testIPv6UDPFrameHeader8,
}
func testMustHexDecodeString(s string) []byte {
data, err := hex.DecodeString(s)
if err != nil {
panic(err)
}
return data
}
func testGenerateFrameHeaders(t *testing.T) [][]byte {
headers := make([][]byte, 64*1024)
typ := make([]byte, 1)
idx := make([]byte, 2)
for i := 0; i < len(headers); i++ {
// select frame header type
_, err := rand.Read(typ)
require.NoError(t, err)
switch typ[0] % 5 {
case 0: // IPv4 + TCP
header := make([]byte, cfhEthernetIPv4TCPSize)
copy(header, testIPv4TCPFrameHeader1)
// random change data
for j := 0; j < 3; j++ {
_, err = rand.Read(idx)
require.NoError(t, err)
index := binary.BigEndian.Uint16(idx) % cfhEthernetIPv4TCPSize
header[index] = idx[1]
}
headers[i] = header
case 1: // IPv4 + UDP
header := make([]byte, cfhEthernetIPv4UDPSize)
copy(header, testIPv4UDPFrameHeader1)
// random change data
for j := 0; j < 2; j++ {
_, err = rand.Read(idx)
require.NoError(t, err)
index := binary.BigEndian.Uint16(idx) % cfhEthernetIPv4UDPSize
header[index] = idx[1]
}
headers[i] = header
case 2: // IPv6 + TCP
header := make([]byte, cfhEthernetIPv6TCPSize)
copy(header, testIPv6TCPFrameHeader1)
// random change data
for j := 0; j < 2; j++ {
_, err = rand.Read(idx)
require.NoError(t, err)
index := binary.BigEndian.Uint16(idx) % cfhEthernetIPv6TCPSize
header[index] = idx[1]
}
headers[i] = header
case 3: // IPv6 + UDP
header := make([]byte, cfhEthernetIPv6UDPSize)
copy(header, testIPv6UDPFrameHeader1)
// random change data
for j := 0; j < 1; j++ {
_, err = rand.Read(idx)
require.NoError(t, err)
index := binary.BigEndian.Uint16(idx) % cfhEthernetIPv6UDPSize
header[index] = idx[1]
}
headers[i] = header
case 4: // random length
sizeBuf := make([]byte, 1)
var size byte
for size < 32 {
_, err = rand.Read(sizeBuf)
require.NoError(t, err)
size = sizeBuf[0]
}
header := make([]byte, size)
_, err = rand.Read(header)
require.NoError(t, err)
// at the end of the generated headers
if i > len(headers)-10 {
headers[i] = header
continue
}
// append similar frame headers
sHeader1 := make([]byte, size)
copy(sHeader1, header)
for j := 0; j < len(header)/cfhMinDiffDiv+2; j++ {
sHeader1[j+10]++
}
sHeader2 := make([]byte, size)
copy(sHeader2, header)
for j := 0; j < len(header)/cfhMinDiffDiv+3; j++ {
sHeader2[j+10]++
}
headers[i] = header
headers[i+1] = sHeader1
headers[i+2] = sHeader2
i += 2
}
}
return headers
}
func TestNewCFHWriter(t *testing.T) {
t.Run("common", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
w := newCFHWriter(output)
require.NotNil(t, w)
})
t.Run("too small dictionary size", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
w, err := newCFHWriterWithSize(output, 0)
require.EqualError(t, err, "dictionary size cannot less than 1")
require.Nil(t, w)
})
t.Run("too large dictionary size", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
w, err := newCFHWriterWithSize(output, cfhMaxDictionarySize+1)
require.EqualError(t, err, "dictionary size cannot greater than 256")
require.Nil(t, w)
})
t.Run("panic with default parameters", func(t *testing.T) {
outputs := []interface{}{nil, errors.New("monkey error")}
patch := gomonkey.ApplyFuncReturn(newCFHWriterWithSize, outputs...)
defer patch.Reset()
output := bytes.NewBuffer(make([]byte, 0, 64))
defer func() {
r := recover()
require.NotNil(t, r)
}()
_ = newCFHWriter(output)
})
}
func TestCFHWriter_Write(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 4096))
t.Run("write as same as the last", func(t *testing.T) {
w := newCFHWriter(output)
for i := 0; i < 100; i++ {
n, err := w.Write(testIPv4TCPFrameHeader1)
require.NoError(t, err)
require.Equal(t, len(testIPv4TCPFrameHeader1), n)
}
r := newCFHReader(output)
buf := make([]byte, len(testIPv4TCPFrameHeader1))
for i := 0; i < 100; i++ {
n, err := r.Read(buf)
require.NoError(t, err)
require.Equal(t, len(testIPv4TCPFrameHeader1), n)
require.Equal(t, testIPv4TCPFrameHeader1, buf)
}
})
t.Run("write as same as the previous", func(t *testing.T) {
w := newCFHWriter(output)
n, err := w.Write(testIPv4TCPFrameHeader1)
require.NoError(t, err)
require.Equal(t, len(testIPv4TCPFrameHeader1), n)
n, err = w.Write(testIPv4TCPFrameHeader2)
require.NoError(t, err)
require.Equal(t, len(testIPv4TCPFrameHeader2), n)
n, err = w.Write(testIPv4TCPFrameHeader1)
require.NoError(t, err)
require.Equal(t, len(testIPv4TCPFrameHeader1), n)
r := newCFHReader(output)
buf := make([]byte, len(testIPv4TCPFrameHeader1))
n, err = r.Read(buf)
require.NoError(t, err)
require.Equal(t, len(testIPv4TCPFrameHeader1), n)
require.Equal(t, testIPv4TCPFrameHeader1, buf)
buf = make([]byte, len(testIPv4TCPFrameHeader2))
n, err = r.Read(buf)
require.NoError(t, err)
require.Equal(t, len(testIPv4TCPFrameHeader2), n)
require.Equal(t, testIPv4TCPFrameHeader2, buf)
buf = make([]byte, len(testIPv4TCPFrameHeader1))
n, err = r.Read(buf)
require.NoError(t, err)
require.Equal(t, len(testIPv4TCPFrameHeader1), n)
require.Equal(t, testIPv4TCPFrameHeader1, buf)
})
t.Run("write empty data", func(t *testing.T) {
w := newCFHWriter(output)
n, err := w.Write(nil)
require.NoError(t, err)
require.Zero(t, n)
})
t.Run("write too large data", func(t *testing.T) {
w := newCFHWriter(output)
data := bytes.Repeat([]byte{0}, cfhMaxFrameHeaderSize+1)
n, err := w.Write(data)
require.EqualError(t, err, "write too large data")
require.Zero(t, n)
})
t.Run("write after appear error", func(t *testing.T) {
pr, pw := io.Pipe()
err := pr.Close()
require.NoError(t, err)
w := newCFHWriter(pw)
n, err := w.Write(testIPv4TCPFrameHeader1)
require.Equal(t, io.ErrClosedPipe, err)
require.Zero(t, n)
n, err = w.Write(testIPv4TCPFrameHeader1)
require.Equal(t, io.ErrClosedPipe, err)
require.Zero(t, n)
err = pw.Close()
require.NoError(t, err)
})
t.Run("failed to write last", func(t *testing.T) {
pr, pw := io.Pipe()
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
defer wg.Done()
buf := make([]byte, 1024)
_, err := pr.Read(buf)
require.NoError(t, err)
}()
w := newCFHWriter(pw)
n, err := w.Write(testIPv4TCPFrameHeader1)
require.NoError(t, err)
require.Equal(t, len(testIPv4TCPFrameHeader1), n)
wg.Wait()
err = pr.Close()
require.NoError(t, err)
n, err = w.Write(testIPv4TCPFrameHeader1)
require.Equal(t, io.ErrClosedPipe, err)
require.Zero(t, n)
err = pw.Close()
require.NoError(t, err)
})
t.Run("failed to write changed data", func(t *testing.T) {
pr, pw := io.Pipe()
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
defer wg.Done()
buf := make([]byte, 1024)
_, err := pr.Read(buf)
require.NoError(t, err)
_, err = pr.Read(buf)
require.NoError(t, err)
}()
w := newCFHWriter(pw)
n, err := w.Write(testIPv4TCPFrameHeader1)
require.NoError(t, err)
require.Equal(t, len(testIPv4TCPFrameHeader1), n)
n, err = w.Write(testIPv4TCPFrameHeader2)
require.NoError(t, err)
require.Equal(t, len(testIPv4TCPFrameHeader2), n)
wg.Wait()
err = pr.Close()
require.NoError(t, err)
n, err = w.Write(testIPv4TCPFrameHeader1)
require.Equal(t, io.ErrClosedPipe, err)
require.Zero(t, n)
err = pw.Close()
require.NoError(t, err)
})
}
func TestCFHWriter_searchDictionary(t *testing.T) {
t.Run("fast", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 4096))
w := newCFHWriter(output)
for _, header := range testFrameHeaders {
n, err := w.Write(header)
require.NoError(t, err)
require.Equal(t, len(header), n)
}
r := newCFHReader(output)
for _, header := range testFrameHeaders {
buf := make([]byte, len(header))
n, err := r.Read(buf)
require.NoError(t, err)
require.Equal(t, len(header), n)
require.Equal(t, header, buf)
}
})
t.Run("slow", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 4096))
headers := testFrameHeaders
for i := 0; i < 16; i++ {
noise := make([]byte, 64)
_, err := rand.Read(noise)
require.NoError(t, err)
headers = append(headers, noise)
}
// append similar frame headers
header := make([]byte, 64)
_, err := rand.Read(header)
require.NoError(t, err)
sHeader1 := make([]byte, 64)
copy(sHeader1, header)
for i := 0; i < len(header)/cfhMinDiffDiv+2; i++ {
sHeader1[i+10]++
}
sHeader2 := make([]byte, 64)
copy(sHeader2, header)
for i := 0; i < len(header)/cfhMinDiffDiv+3; i++ {
sHeader2[i+10]++
}
headers = append(headers, header, sHeader1, sHeader2)
w := newCFHWriter(output)
for _, h := range headers {
nh := append(h, 0)
n, err := w.Write(nh)
require.NoError(t, err)
require.Equal(t, len(nh), n)
}
r := newCFHReader(output)
for _, h := range headers {
nh := append(h, 0)
buf := make([]byte, len(nh))
n, err := r.Read(buf)
require.NoError(t, err)
require.Equal(t, len(nh), n)
require.Equal(t, nh, buf)
}
})
}
func TestNewCFHReader(t *testing.T) {
t.Run("common", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
r := newCFHReader(output)
require.NotNil(t, r)
})
t.Run("too small dictionary size", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
r, err := newCFHReaderWithSize(output, 0)
require.EqualError(t, err, "dictionary size cannot less than 1")
require.Nil(t, r)
})
t.Run("too large dictionary size", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
r, err := newCFHReaderWithSize(output, cfhMaxDictionarySize+1)
require.EqualError(t, err, "dictionary size cannot greater than 256")
require.Nil(t, r)
})
t.Run("panic with default parameters", func(t *testing.T) {
outputs := []interface{}{nil, errors.New("monkey error")}
patch := gomonkey.ApplyFuncReturn(newCFHReaderWithSize, outputs...)
defer patch.Reset()
output := bytes.NewBuffer(make([]byte, 0, 64))
defer func() {
r := recover()
require.NotNil(t, r)
}()
_ = newCFHReader(output)
})
}
func TestCFHReader_Read(t *testing.T) {
t.Run("read remaining data", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 128))
w := newCFHWriter(output)
n, err := w.Write(testIPv4TCPFrameHeader1)
require.NoError(t, err)
require.Equal(t, len(testIPv4TCPFrameHeader1), n)
r := newCFHReader(output)
buf1 := make([]byte, len(testIPv4TCPFrameHeader1)-16)
n, err = r.Read(buf1)
require.NoError(t, err)
require.Equal(t, len(buf1), n)
buf2 := make([]byte, 16)
n, err = r.Read(buf2)
require.NoError(t, err)
require.Equal(t, len(buf2), n)
require.Equal(t, testIPv4TCPFrameHeader1, append(buf1, buf2...))
})
t.Run("read empty buffer", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 128))
r := newCFHReader(output)
n, err := r.Read(nil)
require.NoError(t, err)
require.Zero(t, n)
})
t.Run("read with too large buffer", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
r := newCFHReader(output)
buf := make([]byte, 1024)
n, err := r.Read(buf)
require.EqualError(t, err, "read with too large buffer")
require.Zero(t, n)
})
t.Run("read after appear error", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
r := newCFHReader(output)
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "failed to read decompress command: EOF")
require.Zero(t, n)
n, err = r.Read(buf)
require.EqualError(t, err, "failed to read decompress command: EOF")
require.Zero(t, n)
})
t.Run("failed to read decompress command", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
r := newCFHReader(output)
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "failed to read decompress command: EOF")
require.Zero(t, n)
})
t.Run("invalid decompress command", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
output.WriteByte(0)
r := newCFHReader(output)
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "invalid decompress command: 0")
require.Zero(t, n)
})
t.Run("add dictionary", func(t *testing.T) {
t.Run("failed to read dictionary size", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
output.WriteByte(cfhCMDAddDict)
r := newCFHReader(output)
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "failed to read dictionary size: EOF")
require.Zero(t, n)
})
t.Run("read empty dictionary", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
output.WriteByte(cfhCMDAddDict)
output.WriteByte(0) // dictionary size
r := newCFHReader(output)
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "read empty dictionary")
require.Zero(t, n)
})
t.Run("failed to read dictionary data", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
output.WriteByte(cfhCMDAddDict)
output.WriteByte(1) // dictionary size
r := newCFHReader(output)
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "failed to read dictionary data: EOF")
require.Zero(t, n)
})
})
t.Run("read changed data", func(t *testing.T) {
t.Run("failed to read dictionary index", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
output.WriteByte(cfhCMDData)
r := newCFHReader(output)
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "failed to read dictionary index: EOF")
require.Zero(t, n)
})
t.Run("read invalid dictionary index", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
output.WriteByte(cfhCMDData)
output.WriteByte(0) // dictionary index
r := newCFHReader(output)
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "read invalid dictionary index: 0")
require.Zero(t, n)
})
t.Run("failed to read the number of changed data", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
output.WriteByte(cfhCMDData)
output.WriteByte(0) // dictionary index
r := newCFHReader(output)
r.(*cfhReader).dict[0] = []byte{1, 2, 3, 4}
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "failed to read the number of changed data: EOF")
require.Zero(t, n)
})
t.Run("read invalid changed data", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
output.WriteByte(cfhCMDData)
output.WriteByte(0) // dictionary index
output.WriteByte(5) // the number of changed data
r := newCFHReader(output)
r.(*cfhReader).dict[0] = []byte{1, 2, 3, 4}
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "read invalid changed data size: 5")
require.Zero(t, n)
})
t.Run("failed to read changed data", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
output.WriteByte(cfhCMDData)
output.WriteByte(0) // dictionary index
output.WriteByte(2) // the number of changed data
r := newCFHReader(output)
r.(*cfhReader).dict[0] = []byte{1, 2, 3, 4}
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "failed to read changed data: EOF")
require.Zero(t, n)
})
t.Run("invalid changed data index", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
output.WriteByte(cfhCMDData)
output.WriteByte(0) // dictionary index
output.WriteByte(1) // the number of changed data
output.WriteByte(4) // changed data index
output.WriteByte(123) // changed data
r := newCFHReader(output)
r.(*cfhReader).dict[0] = []byte{1, 2, 3, 4}
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "invalid changed data index: 4")
require.Zero(t, n)
})
})
t.Run("reuse previous data", func(t *testing.T) {
t.Run("failed to read dictionary index", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
output.WriteByte(cfhCMDPrev)
r := newCFHReader(output)
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "failed to read dictionary index: EOF")
require.Zero(t, n)
})
t.Run("read invalid dictionary index", func(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 64))
output.WriteByte(cfhCMDPrev)
output.WriteByte(0) // dictionary index
r := newCFHReader(output)
buf := make([]byte, cfhMaxFrameHeaderSize)
n, err := r.Read(buf)
require.EqualError(t, err, "read invalid dictionary index: 0")
require.Zero(t, n)
})
})
}
func TestIsFrameHeaderPreferBeCompressed(t *testing.T) {
t.Run("Ethernet IPv4 TCP", func(t *testing.T) {
for _, header := range [][]byte{
testIPv4TCPFrameHeader1,
testIPv4TCPFrameHeader2,
testIPv4TCPFrameHeader3,
testIPv4TCPFrameHeader4,
testIPv4TCPFrameHeader5,
testIPv4TCPFrameHeader6,
testIPv4TCPFrameHeader7,
testIPv4TCPFrameHeader8,
} {
size, prefer := isFrameHeaderPreferBeCompressed(header)
require.True(t, prefer)
require.Equal(t, cfhEthernetIPv4TCPSize, size)
}
})
t.Run("Ethernet IPv4 UDP", func(t *testing.T) {
for _, header := range [][]byte{
testIPv4UDPFrameHeader1,
testIPv4UDPFrameHeader2,
testIPv4UDPFrameHeader3,
testIPv4UDPFrameHeader4,
testIPv4UDPFrameHeader5,
testIPv4UDPFrameHeader6,
testIPv4UDPFrameHeader7,
testIPv4UDPFrameHeader8,
} {
size, prefer := isFrameHeaderPreferBeCompressed(header)
require.True(t, prefer)
require.Equal(t, cfhEthernetIPv4UDPSize, size)
}
})
t.Run("Ethernet IPv6 TCP", func(t *testing.T) {
for _, header := range [][]byte{
testIPv6TCPFrameHeader1,
testIPv6TCPFrameHeader2,
testIPv6TCPFrameHeader3,
testIPv6TCPFrameHeader4,
testIPv6TCPFrameHeader5,
testIPv6TCPFrameHeader6,
testIPv6TCPFrameHeader7,
testIPv6TCPFrameHeader8,
} {
size, prefer := isFrameHeaderPreferBeCompressed(header)
require.True(t, prefer)
require.Equal(t, cfhEthernetIPv6TCPSize, size)
}
})
t.Run("Ethernet IPv6 UDP", func(t *testing.T) {
for _, header := range [][]byte{
testIPv6UDPFrameHeader1,
testIPv6UDPFrameHeader2,
testIPv6UDPFrameHeader3,
testIPv6UDPFrameHeader4,
testIPv6UDPFrameHeader5,
testIPv6UDPFrameHeader6,
testIPv6UDPFrameHeader7,
testIPv6UDPFrameHeader8,
} {
size, prefer := isFrameHeaderPreferBeCompressed(header)
require.True(t, prefer)
require.Equal(t, cfhEthernetIPv6UDPSize, size)
}
})
t.Run("too small frame", func(t *testing.T) {
size, prefer := isFrameHeaderPreferBeCompressed([]byte{})
require.False(t, prefer)
require.Zero(t, size)
})
t.Run("other network layer", func(t *testing.T) {
header := make([]byte, len(testIPv4TCPFrameHeader1))
copy(header, testIPv4TCPFrameHeader1)
header[12] = 0xFF // next layer type
header[13] = 0xFF // next layer type
size, prefer := isFrameHeaderPreferBeCompressed(header)
require.False(t, prefer)
require.Zero(t, size)
})
t.Run("IPv4", func(t *testing.T) {
t.Run("with options", func(t *testing.T) {
header := make([]byte, len(testIPv4TCPFrameHeader1))
copy(header, testIPv4TCPFrameHeader1)
header[14] = 0x46 // header length is not 20
size, prefer := isFrameHeaderPreferBeCompressed(header)
require.False(t, prefer)
require.Zero(t, size)
})
t.Run("other transport layer", func(t *testing.T) {
header := make([]byte, len(testIPv4TCPFrameHeader1))
copy(header, testIPv4TCPFrameHeader1)
header[23] = 0xFF
size, prefer := isFrameHeaderPreferBeCompressed(header)
require.False(t, prefer)
require.Zero(t, size)
})
t.Run("TCP", func(t *testing.T) {
t.Run("invalid frame size", func(t *testing.T) {
header := make([]byte, len(testIPv4TCPFrameHeader1)-1)
copy(header, testIPv4TCPFrameHeader1)
size, prefer := isFrameHeaderPreferBeCompressed(header)
require.False(t, prefer)
require.Zero(t, size)
})
t.Run("with options", func(t *testing.T) {
header := make([]byte, len(testIPv4TCPFrameHeader1))
copy(header, testIPv4TCPFrameHeader1)
header[46] = 0xFF
size, prefer := isFrameHeaderPreferBeCompressed(header)
require.False(t, prefer)
require.Zero(t, size)
})
})
})
t.Run("IPv6", func(t *testing.T) {
t.Run("other transport layer", func(t *testing.T) {
header := make([]byte, len(testIPv6TCPFrameHeader1))
copy(header, testIPv6TCPFrameHeader1)
header[20] = 0xFF
size, prefer := isFrameHeaderPreferBeCompressed(header)
require.False(t, prefer)
require.Zero(t, size)
})
t.Run("TCP", func(t *testing.T) {
t.Run("invalid frame size", func(t *testing.T) {
header := make([]byte, len(testIPv6TCPFrameHeader1)-1)
copy(header, testIPv6TCPFrameHeader1)
size, prefer := isFrameHeaderPreferBeCompressed(header)
require.False(t, prefer)
require.Zero(t, size)
})
t.Run("with options", func(t *testing.T) {
header := make([]byte, len(testIPv6TCPFrameHeader1))
copy(header, testIPv6TCPFrameHeader1)
header[66] = 0xFF
size, prefer := isFrameHeaderPreferBeCompressed(header)
require.False(t, prefer)
require.Zero(t, size)
})
})
t.Run("UDP", func(t *testing.T) {
t.Run("invalid frame size", func(t *testing.T) {
header := make([]byte, len(testIPv6UDPFrameHeader1)-1)
copy(header, testIPv6UDPFrameHeader1)
size, prefer := isFrameHeaderPreferBeCompressed(header)
require.False(t, prefer)
require.Zero(t, size)
})
})
})
}
func TestCFHWriter_Fuzz(t *testing.T) {
output := bytes.NewBuffer(make([]byte, 0, 4*1024*1024))
headers := testGenerateFrameHeaders(t)
w := newCFHWriter(output)
for _, header := range headers {
n, err := w.Write(header)
require.NoError(t, err)
require.Equal(t, len(header), n)
}
r := newCFHReader(output)
for _, header := range headers {
buf := make([]byte, len(header))
n, err := r.Read(buf)
require.NoError(t, err)
require.Equal(t, len(header), n)
require.Equal(t, header, buf)
}
}
func TestCFHReader_Fuzz(t *testing.T) {
data := make([]byte, 128)
reader := bytes.NewReader(data)
buf := make([]byte, cfhMaxFrameHeaderSize)
for i := 0; i < 128*1024; i++ {
_, err := rand.Read(data)
require.NoError(t, err)
_, err = reader.Seek(0, io.SeekStart)
require.NoError(t, err)
r := newCFHReader(reader)
_, _ = r.Read(buf)
}
}
func TestIsFrameHeaderPreferBeCompressed_Fuzz(t *testing.T) {
headers := testGenerateFrameHeaders(t)
for _, header := range headers {
f := append(header, 0)
size, prefer := isFrameHeaderPreferBeCompressed(f)
if !prefer {
continue
}
switch size {
case cfhEthernetIPv4TCPSize:
case cfhEthernetIPv4UDPSize:
case cfhEthernetIPv6TCPSize:
case cfhEthernetIPv6UDPSize:
default:
t.Fatalf("invalid size: %d", size)
}
}
}
func BenchmarkCFHWriter_Write(b *testing.B) {
b.Run("Ethernet IPv4 TCP", benchmarkCFHWriterWriteEthernetIPv4TCP)
b.Run("Ethernet IPv4 UDP", benchmarkCFHWriterWriteEthernetIPv4UDP)
b.Run("Ethernet IPv6 TCP", benchmarkCFHWriterWriteEthernetIPv6TCP)
b.Run("Ethernet IPv6 UDP", benchmarkCFHWriterWriteEthernetIPv6UDP)
b.Run("Custom Frame Header", benchmarkCFHWriterWriteCustomFrameHeader)
}
func benchmarkCFHWriterWriteEthernetIPv4TCP(b *testing.B) {
b.Run("single dictionary", func(b *testing.B) {
output := bytes.NewBuffer(make([]byte, 0, 64*1024*1024))
w := newCFHWriter(output)
header := make([]byte, len(testIPv4TCPFrameHeader1))
copy(header, testIPv4TCPFrameHeader1)
b.ReportAllocs()
b.ResetTimer()
var err error
for i := 0; i < b.N; i++ {
_, err = w.Write(header)
if err != nil {
b.Fatal(err)
}
// data that change frequently
header[17] = byte(i) + 1 // IPv4 Total Length [byte 2]
header[19] = byte(i) + 2 // IPv4 ID [byte 2]
header[25] = byte(i) + 3 // IPv4 checksum [byte 2]
header[41] = byte(i) + 4 // TCP Sequence [byte 4]
header[45] = byte(i) + 5 // TCP acknowledgment [byte 4]
header[50] = byte(i) + 6 // TCP checksum [byte 1]
header[51] = byte(i) + 7 // TCP checksum [byte 2]
}
b.StopTimer()
})