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//go:build go1.18
// +build go1.18
package flate
import (
"bytes"
"io"
"strconv"
"testing"
"github.com/klauspost/compress/internal/fuzz"
)
func FuzzEncoding(f *testing.F) {
fuzz.AddFromZip(f, "testdata/regression.zip", true, false)
fuzz.AddFromZip(f, "testdata/fuzz/encode-raw-corpus.zip", true, testing.Short())
fuzz.AddFromZip(f, "testdata/fuzz/FuzzEncoding.zip", false, testing.Short())
// Fuzzing tweaks:
const (
// Test a subset of encoders.
startFuzz = HuffmanOnly
endFuzz = BestCompression
// Also tests with dictionaries...
testDicts = true
// Max input size:
maxSize = 1 << 20
)
decoder := NewReader(nil)
buf := new(bytes.Buffer)
f.Fuzz(func(t *testing.T, data []byte) {
if len(data) > maxSize {
return
}
for level := startFuzz; level <= endFuzz; level++ {
msg := "level " + strconv.Itoa(level) + ":"
buf.Reset()
fw, err := NewWriter(buf, level)
if err != nil {
t.Fatal(msg + err.Error())
}
n, err := fw.Write(data)
if n != len(data) {
t.Fatal(msg + "short write")
}
if err != nil {
t.Fatal(msg + err.Error())
}
err = fw.Close()
if err != nil {
t.Fatal(msg + err.Error())
}
decoder.(Resetter).Reset(buf, nil)
data2, err := io.ReadAll(decoder)
if err != nil {
t.Fatal(msg + err.Error())
}
if !bytes.Equal(data, data2) {
t.Fatal(msg + "not equal")
}
// Do it again...
msg = "level " + strconv.Itoa(level) + " (reset):"
buf.Reset()
fw.Reset(buf)
n, err = fw.Write(data)
if n != len(data) {
t.Fatal(msg + "short write")
}
if err != nil {
t.Fatal(msg + err.Error())
}
err = fw.Close()
if err != nil {
t.Fatal(msg + err.Error())
}
decoder.(Resetter).Reset(buf, nil)
data2, err = io.ReadAll(decoder)
if err != nil {
t.Fatal(msg + err.Error())
}
if !bytes.Equal(data, data2) {
t.Fatal(msg + "not equal")
}
}
// Split into two and use history...
buf.Reset()
err := StatelessDeflate(buf, data[:len(data)/2], false, nil)
if err != nil {
t.Error(err)
}
// Use top half as dictionary...
dict := data[:len(data)/2]
err = StatelessDeflate(buf, data[len(data)/2:], true, dict)
if err != nil {
t.Error(err)
}
decoder.(Resetter).Reset(buf, nil)
data2, err := io.ReadAll(decoder)
if err != nil {
t.Error(err)
}
if !bytes.Equal(data, data2) {
//fmt.Printf("want:%x\ngot: %x\n", data1, data2)
t.Error("not equal")
}
})
}
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