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main.go
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main.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 zip
import (
"archive/zip"
"bytes"
"fmt"
"io/ioutil"
"github.com/dvyukov/go-fuzz/examples/fuzz"
)
func Fuzz(data []byte) int {
// Read in the archive.
z, err := zip.NewReader(bytes.NewReader(data), int64(len(data)))
if err != nil {
if z != nil {
panic("non nil z")
}
return 0
}
var headers []*zip.FileHeader
var contents [][]byte
for _, f := range z.File {
r, err := f.Open()
if err != nil {
continue
}
if f.UncompressedSize64 < 1e6 {
c, err := ioutil.ReadAll(r)
if err != nil {
continue
}
if uint64(len(c)) != f.UncompressedSize64 {
println("bad size:", len(c), f.UncompressedSize64)
panic("bad size")
}
hdr := f.FileHeader
headers = append(headers, &hdr)
contents = append(contents, c)
}
r.Close()
}
if len(headers) == 0 {
return 1
}
// Write a new archive with the same files.
buf := new(bytes.Buffer)
w := zip.NewWriter(buf)
for i, h := range headers {
w1, err := w.CreateHeader(h)
if err != nil {
panic(err)
}
n, err := w1.Write(contents[i])
if err != nil {
panic(err)
}
if n != len(contents[i]) {
panic("short write")
}
}
err = w.Close()
if err != nil {
panic(err)
}
// Read in the new archive.
z1, err := zip.NewReader(bytes.NewReader(buf.Bytes()), int64(len(buf.Bytes())))
if err != nil {
panic(err)
}
var headers1 []*zip.FileHeader
var contents1 [][]byte
for _, f := range z1.File {
r, err := f.Open()
if err != nil {
panic(err)
}
if f.UncompressedSize64 >= 1e6 {
panic("corrupted length")
}
c, err := ioutil.ReadAll(r)
if err != nil {
panic(err)
}
if uint64(len(c)) != f.UncompressedSize64 {
println("bad size:", len(c), f.UncompressedSize64)
panic("bad size")
}
hdr := f.FileHeader
headers1 = append(headers1, &hdr)
contents1 = append(contents1, c)
r.Close()
}
// Compare that we have the same data after compress/decompress.
for i, h := range headers {
// These fields are set by archive/zip package.
h.Flags |= 0x8
h.CreatorVersion = headers1[i].CreatorVersion
h.ReaderVersion = headers1[i].ReaderVersion
// These are not set correctly initially.
//h.CompressedSize = headers1[i].CompressedSize
//h.CompressedSize64 = headers1[i].CompressedSize64
if !fuzz.DeepEqual(h, headers1[i]) {
fmt.Printf("hdr0: %#v\n", h)
fmt.Printf("hdr1: %#v\n", headers1[i])
panic("corrupted header")
}
if !fuzz.DeepEqual(contents[i], contents1[i]) {
panic("corrupted data")
}
}
return 1
}