func rZipBytes() []byte {
	s := `
0000000 50 4b 03 04 14 00 00 00 08 00 08 03 64 3c f9 f4
0000010 89 64 48 01 00 00 b8 01 00 00 07 00 00 00 72 2f
0000020 72 2e 7a 69 70 00 25 00 da ff 50 4b 03 04 14 00
0000030 00 00 08 00 08 03 64 3c f9 f4 89 64 48 01 00 00
0000040 b8 01 00 00 07 00 00 00 72 2f 72 2e 7a 69 70 00
0000050 2f 00 d0 ff 00 25 00 da ff 50 4b 03 04 14 00 00
0000060 00 08 00 08 03 64 3c f9 f4 89 64 48 01 00 00 b8
0000070 01 00 00 07 00 00 00 72 2f 72 2e 7a 69 70 00 2f
0000080 00 d0 ff c2 54 8e 57 39 00 05 00 fa ff c2 54 8e
0000090 57 39 00 05 00 fa ff 00 05 00 fa ff 00 14 00 eb
00000a0 ff c2 54 8e 57 39 00 05 00 fa ff 00 05 00 fa ff
00000b0 00 14 00 eb ff 42 88 21 c4 00 00 14 00 eb ff 42
00000c0 88 21 c4 00 00 14 00 eb ff 42 88 21 c4 00 00 14
00000d0 00 eb ff 42 88 21 c4 00 00 14 00 eb ff 42 88 21
00000e0 c4 00 00 00 00 ff ff 00 00 00 ff ff 00 34 00 cb
00000f0 ff 42 88 21 c4 00 00 00 00 ff ff 00 00 00 ff ff
0000100 00 34 00 cb ff 42 e8 21 5e 0f 00 00 00 ff ff 0a
0000110 f0 66 64 12 61 c0 15 dc e8 a0 48 bf 48 af 2a b3
0000120 20 c0 9b 95 0d c4 67 04 42 53 06 06 06 40 00 06
0000130 00 f9 ff 6d 01 00 00 00 00 42 e8 21 5e 0f 00 00
0000140 00 ff ff 0a f0 66 64 12 61 c0 15 dc e8 a0 48 bf
0000150 48 af 2a b3 20 c0 9b 95 0d c4 67 04 42 53 06 06
0000160 06 40 00 06 00 f9 ff 6d 01 00 00 00 00 50 4b 01
0000170 02 14 00 14 00 00 00 08 00 08 03 64 3c f9 f4 89
0000180 64 48 01 00 00 b8 01 00 00 07 00 00 00 00 00 00
0000190 00 00 00 00 00 00 00 00 00 00 00 72 2f 72 2e 7a
00001a0 69 70 50 4b 05 06 00 00 00 00 01 00 01 00 35 00
00001b0 00 00 6d 01 00 00 00 00`
	s = regexp.MustCompile(`[0-9a-f]{7}`).ReplaceAllString(s, "")
	s = regexp.MustCompile(`\s+`).ReplaceAllString(s, "")
	b, err := hex.DecodeString(s)
	if err != nil {
		panic(err)
	}
	return b
}
rZipBytes returns the bytes of a recursive zip file, without
putting it on disk and triggering certain virus scanners.
package zip
import (
	"bytes"
	"encoding/binary"
	"encoding/hex"
	"io"
	"io/ioutil"
	"os"
	"path/filepath"
	"regexp"
	"strings"
	"testing"
	"time"
)
type ZipTest struct {
	Name    string
	Source  func() (r io.ReaderAt, size int64)  
	Comment string
	File    []ZipTestFile
	Error   error  
}
type ZipTestFile struct {
	Name       string
	Content    []byte  
	ContentErr error
	File       string  
	Mtime      string  
	Mode       os.FileMode
}
var tests = []ZipTest{
	{
		Name:    "test.zip",
		Comment: "This is a zipfile comment.",
		File: []ZipTestFile{
			{
				Name:    "test.txt",
				Content: []byte("This is a test text file.\n"),
				Mtime:   "09-05-10 12:12:02",
				Mode:    0644,
			},
			{
				Name:  "gophercolor16x16.png",
				File:  "gophercolor16x16.png",
				Mtime: "09-05-10 15:52:58",
				Mode:  0644,
			},
		},
	},
	{
		Name:    "test-trailing-junk.zip",
		Comment: "This is a zipfile comment.",
		File: []ZipTestFile{
			{
				Name:    "test.txt",
				Content: []byte("This is a test text file.\n"),
				Mtime:   "09-05-10 12:12:02",
				Mode:    0644,
			},
			{
				Name:  "gophercolor16x16.png",
				File:  "gophercolor16x16.png",
				Mtime: "09-05-10 15:52:58",
				Mode:  0644,
			},
		},
	},
	{
		Name:   "r.zip",
		Source: returnRecursiveZip,
		File: []ZipTestFile{
			{
				Name:    "r/r.zip",
				Content: rZipBytes(),
				Mtime:   "03-04-10 00:24:16",
				Mode:    0666,
			},
		},
	},
	{
		Name: "symlink.zip",
		File: []ZipTestFile{
			{
				Name:    "symlink",
				Content: []byte("../target"),
				Mode:    0777 | os.ModeSymlink,
			},
		},
	},
	{
		Name: "readme.zip",
	},
	{
		Name:  "readme.notzip",
		Error: ErrFormat,
	},
	{
		Name: "dd.zip",
		File: []ZipTestFile{
			{
				Name:    "filename",
				Content: []byte("This is a test textfile.\n"),
				Mtime:   "02-02-11 13:06:20",
				Mode:    0666,
			},
		},
	},
	{
		Name: "winxp.zip",
		File: crossPlatform,
	},
	{
		Name: "unix.zip",
		File: crossPlatform,
	},
	{
		Name: "go-no-datadesc-sig.zip",
		File: []ZipTestFile{
			{
				Name:    "foo.txt",
				Content: []byte("foo\n"),
				Mtime:   "03-08-12 16:59:10",
				Mode:    0644,
			},
			{
				Name:    "bar.txt",
				Content: []byte("bar\n"),
				Mtime:   "03-08-12 16:59:12",
				Mode:    0644,
			},
		},
	},
	{
		Name: "go-with-datadesc-sig.zip",
		File: []ZipTestFile{
			{
				Name:    "foo.txt",
				Content: []byte("foo\n"),
				Mode:    0666,
			},
			{
				Name:    "bar.txt",
				Content: []byte("bar\n"),
				Mode:    0666,
			},
		},
	},
	{
		Name:   "Bad-CRC32-in-data-descriptor",
		Source: returnCorruptCRC32Zip,
		File: []ZipTestFile{
			{
				Name:       "foo.txt",
				Content:    []byte("foo\n"),
				Mode:       0666,
				ContentErr: ErrChecksum,
			},
			{
				Name:    "bar.txt",
				Content: []byte("bar\n"),
				Mode:    0666,
			},
		},
	},
	{
		Name: "crc32-not-streamed.zip",
		File: []ZipTestFile{
			{
				Name:    "foo.txt",
				Content: []byte("foo\n"),
				Mtime:   "03-08-12 16:59:10",
				Mode:    0644,
			},
			{
				Name:    "bar.txt",
				Content: []byte("bar\n"),
				Mtime:   "03-08-12 16:59:12",
				Mode:    0644,
			},
		},
	},
	{
		Name:   "crc32-not-streamed.zip",
		Source: returnCorruptNotStreamedZip,
		File: []ZipTestFile{
			{
				Name:       "foo.txt",
				Content:    []byte("foo\n"),
				Mtime:      "03-08-12 16:59:10",
				Mode:       0644,
				ContentErr: ErrChecksum,
			},
			{
				Name:    "bar.txt",
				Content: []byte("bar\n"),
				Mtime:   "03-08-12 16:59:12",
				Mode:    0644,
			},
		},
	},
	{
		Name: "zip64.zip",
		File: []ZipTestFile{
			{
				Name:    "README",
				Content: []byte("This small file is in ZIP64 format.\n"),
				Mtime:   "08-10-12 14:33:32",
				Mode:    0644,
			},
		},
	},
	{
		Name: "zip64-2.zip",
		File: []ZipTestFile{
			{
				Name:    "README",
				Content: []byte("This small file is in ZIP64 format.\n"),
				Mtime:   "08-10-12 14:33:32",
				Mode:    0644,
			},
		},
	},
}
var crossPlatform = []ZipTestFile{
	{
		Name:    "hello",
		Content: []byte("world \r\n"),
		Mode:    0666,
	},
	{
		Name:    "dir/bar",
		Content: []byte("foo \r\n"),
		Mode:    0666,
	},
	{
		Name:    "dir/empty/",
		Content: []byte{},
		Mode:    os.ModeDir | 0777,
	},
	{
		Name:    "readonly",
		Content: []byte("important \r\n"),
		Mode:    0444,
	},
}
func TestReader(t *testing.T) {
	for _, zt := range tests {
		readTestZip(t, zt)
	}
}
func readTestZip(t *testing.T, zt ZipTest) {
	var z *Reader
	var err error
	if zt.Source != nil {
		rat, size := zt.Source()
		z, err = NewReader(rat, size)
	} else {
		var rc *ReadCloser
		rc, err = OpenReader(filepath.Join("testdata", zt.Name))
		if err == nil {
			defer rc.Close()
			z = &rc.Reader
		}
	}
	if err != zt.Error {
		t.Errorf("%s: error=%v, want %v", zt.Name, err, zt.Error)
		return
	}
	if err == ErrFormat {
		return
	}
	if zt.File == nil {
		return
	}
	if z.Comment != zt.Comment {
		t.Errorf("%s: comment=%q, want %q", zt.Name, z.Comment, zt.Comment)
	}
	if len(z.File) != len(zt.File) {
		t.Fatalf("%s: file count=%d, want %d", zt.Name, len(z.File), len(zt.File))
	}
	for i, ft := range zt.File {
		readTestFile(t, zt, ft, z.File[i])
	}
	n := 0
	done := make(chan bool)
	for i := 0; i < 5; i++ {
		for j, ft := range zt.File {
			go func(j int, ft ZipTestFile) {
				readTestFile(t, zt, ft, z.File[j])
				done <- true
			}(j, ft)
			n++
		}
	}
	for ; n > 0; n-- {
		<-done
	}
}
func readTestFile(t *testing.T, zt ZipTest, ft ZipTestFile, f *File) {
	if f.Name != ft.Name {
		t.Errorf("%s: name=%q, want %q", zt.Name, f.Name, ft.Name)
	}
	if ft.Mtime != "" {
		mtime, err := time.Parse("01-02-06 15:04:05", ft.Mtime)
		if err != nil {
			t.Error(err)
			return
		}
		if ft := f.ModTime(); !ft.Equal(mtime) {
			t.Errorf("%s: %s: mtime=%s, want %s", zt.Name, f.Name, ft, mtime)
		}
	}
	testFileMode(t, zt.Name, f, ft.Mode)
	var b bytes.Buffer
	r, err := f.Open()
	if err != nil {
		t.Errorf("%s: %v", zt.Name, err)
		return
	}
	_, err = io.Copy(&b, r)
	if err != ft.ContentErr {
		t.Errorf("%s: copying contents: %v (want %v)", zt.Name, err, ft.ContentErr)
	}
	if err != nil {
		return
	}
	r.Close()
	size := uint64(f.UncompressedSize)
	if size == uint32max {
		size = f.UncompressedSize64
	}
	if g := uint64(b.Len()); g != size {
		t.Errorf("%v: read %v bytes but f.UncompressedSize == %v", f.Name, g, size)
	}
	var c []byte
	if ft.Content != nil {
		c = ft.Content
	} else if c, err = ioutil.ReadFile("testdata/" + ft.File); err != nil {
		t.Error(err)
		return
	}
	if b.Len() != len(c) {
		t.Errorf("%s: len=%d, want %d", f.Name, b.Len(), len(c))
		return
	}
	for i, b := range b.Bytes() {
		if b != c[i] {
			t.Errorf("%s: content[%d]=%q want %q", f.Name, i, b, c[i])
			return
		}
	}
}
func testFileMode(t *testing.T, zipName string, f *File, want os.FileMode) {
	mode := f.Mode()
	if want == 0 {
		t.Errorf("%s: %s mode: got %v, want none", zipName, f.Name, mode)
	} else if mode != want {
		t.Errorf("%s: %s mode: want %v, got %v", zipName, f.Name, want, mode)
	}
}
func TestInvalidFiles(t *testing.T) {
	const size = 1024 * 70  
	b := make([]byte, size)
	_, err := NewReader(bytes.NewReader(b), size)
	if err != ErrFormat {
		t.Errorf("zeroes: error=%v, want %v", err, ErrFormat)
	}
	sig := make([]byte, 4)
	binary.LittleEndian.PutUint32(sig, directoryEndSignature)
	for i := 0; i < size-4; i += 4 {
		copy(b[i:i+4], sig)
	}
	_, err = NewReader(bytes.NewReader(b), size)
	if err != ErrFormat {
		t.Errorf("sigs: error=%v, want %v", err, ErrFormat)
	}
}
func messWith(fileName string, corrupter func(b []byte)) (r io.ReaderAt, size int64) {
	data, err := ioutil.ReadFile(filepath.Join("testdata", fileName))
	if err != nil {
		panic("Error reading " + fileName + ": " + err.Error())
	}
	corrupter(data)
	return bytes.NewReader(data), int64(len(data))
}
func returnCorruptCRC32Zip() (r io.ReaderAt, size int64) {
	return messWith("go-with-datadesc-sig.zip", func(b []byte) {
		b[0x2d]++
	})
}
func returnCorruptNotStreamedZip() (r io.ReaderAt, size int64) {
	return messWith("crc32-not-streamed.zip", func(b []byte) {
		b[0x11]++
		b[0x9d]++
	})
}