fuzz.go

     1  // Copyright 2019 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build gofuzz
     6  
     7  package png
     8  
     9  import (
    10  	"bytes"
    11  	"fmt"
    12  )
    13  
    14  func Fuzz(data []byte) int {
    15  	cfg, err := DecodeConfig(bytes.NewReader(data))
    16  	if err != nil {
    17  		return 0
    18  	}
    19  	if cfg.Width*cfg.Height > 1e6 {
    20  		return 0
    21  	}
    22  	img, err := Decode(bytes.NewReader(data))
    23  	if err != nil {
    24  		return 0
    25  	}
    26  	levels := []CompressionLevel{
    27  		DefaultCompression,
    28  		NoCompression,
    29  		BestSpeed,
    30  		BestCompression,
    31  	}
    32  	for _, l := range levels {
    33  		var w bytes.Buffer
    34  		e := &Encoder{CompressionLevel: l}
    35  		err = e.Encode(&w, img)
    36  		if err != nil {
    37  			panic(err)
    38  		}
    39  		img1, err := Decode(&w)
    40  		if err != nil {
    41  			panic(err)
    42  		}
    43  		got := img1.Bounds()
    44  		want := img.Bounds()
    45  		if !got.Eq(want) {
    46  			fmt.Printf("bounds0: %#v\n", want)
    47  			fmt.Printf("bounds1: %#v\n", got)
    48  			panic("bounds have changed")
    49  		}
    50  	}
    51  	return 1
    52  }
    53
View as plain text