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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package png
import (
"bytes"
"image"
"os"
"path/filepath"
"strings"
"testing"
)
func FuzzDecode(f *testing.F) {
if testing.Short() {
f.Skip("Skipping in short mode")
}
testdata, err := os.ReadDir("../testdata")
if err != nil {
f.Fatalf("failed to read testdata directory: %s", err)
}
for _, de := range testdata {
if de.IsDir() || !strings.HasSuffix(de.Name(), ".png") {
continue
}
b, err := os.ReadFile(filepath.Join("../testdata", de.Name()))
if err != nil {
f.Fatalf("failed to read testdata: %s", err)
}
f.Add(b)
}
f.Fuzz(func(t *testing.T, b []byte) {
cfg, _, err := image.DecodeConfig(bytes.NewReader(b))
if err != nil {
return
}
if cfg.Width*cfg.Height > 1e6 {
return
}
img, typ, err := image.Decode(bytes.NewReader(b))
if err != nil || typ != "png" {
return
}
levels := []CompressionLevel{
DefaultCompression,
NoCompression,
BestSpeed,
BestCompression,
}
for _, l := range levels {
var w bytes.Buffer
e := &Encoder{CompressionLevel: l}
err = e.Encode(&w, img)
if err != nil {
t.Errorf("failed to encode valid image: %s", err)
continue
}
img1, err := Decode(&w)
if err != nil {
t.Errorf("failed to decode roundtripped image: %s", err)
continue
}
got := img1.Bounds()
want := img.Bounds()
if !got.Eq(want) {
t.Errorf("roundtripped image bounds have changed, got: %s, want: %s", got, want)
}
}
})
}
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