forked from dvyukov/go-fuzz
/
png.go
43 lines (40 loc) · 950 Bytes
/
png.go
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// Copyright 2015 Dmitry Vyukov. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package png
import (
"bytes"
"fmt"
"image/png"
"reflect"
)
func Fuzz(data []byte) int {
cfg, err := png.DecodeConfig(bytes.NewReader(data))
if err != nil {
return 0
}
if cfg.Width*cfg.Height > 1e6 {
return 0
}
img, err := png.Decode(bytes.NewReader(data))
if err != nil {
return 0
}
for _, c := range []png.CompressionLevel{png.DefaultCompression, png.NoCompression, png.BestSpeed, png.BestCompression} {
var w bytes.Buffer
e := &png.Encoder{c}
err = e.Encode(&w, img)
if err != nil {
panic(err)
}
img1, err := png.Decode(&w)
if err != nil {
panic(err)
}
if !reflect.DeepEqual(img.Bounds(), img1.Bounds()) {
fmt.Printf("bounds0: %#v\n", img.Bounds())
fmt.Printf("bounds1: %#v\n", img1.Bounds())
panic("bounds have changed")
}
}
return 1
}