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fuzz_test.go
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fuzz_test.go
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// +build gofuzzbeta
package zstd_test
import (
"archive/tar"
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"runtime"
"testing"
"github.com/klauspost/compress/zstd"
)
func FuzzCompress(f *testing.F) {
var dec *zstd.Decoder
var encs [zstd.SpeedBestCompression + 1]*zstd.Encoder
var encsD [zstd.SpeedBestCompression + 1]*zstd.Encoder
runtime.GOMAXPROCS(2)
// Also tests with dictionaries...
const testDicts = false
initEnc := func() func() {
dict, err := ioutil.ReadFile("testdata/d0.dict")
if err != nil {
panic(err)
}
dec, err = zstd.NewReader(nil, zstd.WithDecoderConcurrency(1), zstd.WithDecoderDicts(dict))
if err != nil {
panic(err)
}
for level := zstd.SpeedFastest; level <= zstd.SpeedBestCompression; level++ {
encs[level], err = zstd.NewWriter(nil, zstd.WithEncoderCRC(true), zstd.WithEncoderLevel(level), zstd.WithEncoderConcurrency(2), zstd.WithWindowSize(128<<10), zstd.WithZeroFrames(true), zstd.WithLowerEncoderMem(true))
if testDicts {
encsD[level], err = zstd.NewWriter(nil, zstd.WithEncoderCRC(true), zstd.WithEncoderLevel(level), zstd.WithEncoderConcurrency(2), zstd.WithWindowSize(128<<10), zstd.WithZeroFrames(true), zstd.WithEncoderDict(dict), zstd.WithLowerEncoderMem(true), zstd.WithLowerEncoderMem(true))
}
}
return func() {
dec.Close()
for _, enc := range encs {
if enc != nil {
enc.Close()
}
}
if testDicts {
for _, enc := range encsD {
if enc != nil {
enc.Close()
}
}
}
}
}
f.Cleanup(initEnc())
// Run test against out decoder
var dst bytes.Buffer
// Create a buffer that will usually be too small.
corpus, err := os.Open("testdata/corpus.tar.zst")
if err != nil {
f.Fatal(err)
}
err = dec.Reset(corpus)
if err != nil {
f.Fatal(err)
}
tr := tar.NewReader(dec)
load_corpus:
for {
header, err := tr.Next()
switch err {
case io.EOF:
break load_corpus
default:
f.Fatal(err)
case nil:
}
if header.Typeflag != tar.TypeReg {
continue
}
tmp := make([]byte, header.Size)
_, err = io.ReadFull(tr, tmp)
if err != nil {
f.Fatal(err)
}
if header.Size > 100<<10 {
continue
}
f.Add(tmp)
}
corpus.Close()
dec.Reset(nil)
f.Fuzz(func(t *testing.T, data []byte) {
if len(data) > 1<<20 {
return
}
var bufSize = len(data)
if bufSize > 2 {
// Make deterministic size
bufSize = int(data[0]) | int(data[1])<<8
if bufSize >= len(data) {
bufSize = len(data) / 2
}
}
for level := zstd.SpeedFastest; level <= zstd.SpeedBestCompression; level++ {
enc := encs[level]
dst.Reset()
enc.Reset(&dst)
n, err := enc.Write(data)
if err != nil {
t.Fatal(err)
}
if n != len(data) {
t.Fatal(fmt.Sprintln("Level", level, "Short write, got:", n, "want:", len(data)))
}
encoded := enc.EncodeAll(data, make([]byte, 0, bufSize))
got, err := dec.DecodeAll(encoded, make([]byte, 0, bufSize))
if err != nil {
t.Fatal(fmt.Sprintln("Level", level, "DecodeAll error:", err, "\norg:", len(data), "\nencoded", len(encoded)))
}
if !bytes.Equal(got, data) {
t.Fatal(fmt.Sprintln("Level", level, "DecodeAll output mismatch\n", len(got), "org: \n", len(data), "(want)", "\nencoded:", len(encoded)))
}
err = enc.Close()
if err != nil {
t.Fatal(fmt.Sprintln("Level", level, "Close (buffer) error:", err))
}
encoded2 := dst.Bytes()
if !bytes.Equal(encoded, encoded2) {
got, err = dec.DecodeAll(encoded2, got[:0])
if err != nil {
t.Fatal(fmt.Sprintln("Level", level, "DecodeAll (buffer) error:", err, "\norg:", len(data), "\nencoded", len(encoded2)))
}
if !bytes.Equal(got, data) {
t.Fatal(fmt.Sprintln("Level", level, "DecodeAll (buffer) output mismatch\n", len(got), "org: \n", len(data), "(want)", "\nencoded:", len(encoded2)))
}
}
if !testDicts {
continue
}
enc = encsD[level]
dst.Reset()
enc.Reset(&dst)
n, err = enc.Write(data)
if err != nil {
t.Fatal(err)
}
if n != len(data) {
t.Fatal(fmt.Sprintln("Dict Level", level, "Short write, got:", n, "want:", len(data)))
}
encoded = enc.EncodeAll(data, encoded[:0])
got, err = dec.DecodeAll(encoded, got[:0])
if err != nil {
t.Fatal(fmt.Sprintln("Dict Level", level, "DecodeAll error:", err, "\norg:", len(data), "\nencoded", len(encoded)))
}
if !bytes.Equal(got, data) {
t.Fatal(fmt.Sprintln("Dict Level", level, "DecodeAll output mismatch\n", len(got), "org: \n", len(data), "(want)", "\nencoded:", len(encoded)))
}
err = enc.Close()
if err != nil {
t.Fatal(fmt.Sprintln("Dict Level", level, "Close (buffer) error:", err))
}
encoded2 = dst.Bytes()
if !bytes.Equal(encoded, encoded2) {
got, err = dec.DecodeAll(encoded2, got[:0])
if err != nil {
t.Fatal(fmt.Sprintln("Dict Level", level, "DecodeAll (buffer) error:", err, "\norg:", len(data), "\nencoded", len(encoded2)))
}
if !bytes.Equal(got, data) {
t.Fatal(fmt.Sprintln("Dict Level", level, "DecodeAll (buffer) output mismatch\n", len(got), "org: \n", len(data), "(want)", "\nencoded:", len(encoded2)))
}
}
}
})
}