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// Copyright 2009 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 tar
 
import (
        "bytes"
        "fmt"
        "io"
        "io/ioutil"
        "testing"
        "testing/iotest"
        "time"
)
 
type writerTestEntry struct {
        header   *Header
        contents string
}
 
type writerTest struct {
        file    string // filename of expected output
        entries []*writerTestEntry
}
 
var writerTests = []*writerTest{
        // The writer test file was produced with this command:
        // tar (GNU tar) 1.26
        //   ln -s small.txt link.txt
        //   tar -b 1 --format=ustar -c -f writer.tar small.txt small2.txt link.txt
        {
                file: "testdata/writer.tar",
                entries: []*writerTestEntry{
                        {
                                header: &Header{
                                        Name:     "small.txt",
                                        Mode:     0640,
                                        Uid:      73025,
                                        Gid:      5000,
                                        Size:     5,
                                        ModTime:  time.Unix(1246508266, 0),
                                        Typeflag: '0',
                                        Uname:    "dsymonds",
                                        Gname:    "eng",
                                },
                                contents: "Kilts",
                        },
                        {
                                header: &Header{
                                        Name:     "small2.txt",
                                        Mode:     0640,
                                        Uid:      73025,
                                        Gid:      5000,
                                        Size:     11,
                                        ModTime:  time.Unix(1245217492, 0),
                                        Typeflag: '0',
                                        Uname:    "dsymonds",
                                        Gname:    "eng",
                                },
                                contents: "Google.com\n",
                        },
                        {
                                header: &Header{
                                        Name:     "link.txt",
                                        Mode:     0777,
                                        Uid:      1000,
                                        Gid:      1000,
                                        Size:     0,
                                        ModTime:  time.Unix(1314603082, 0),
                                        Typeflag: '2',
                                        Linkname: "small.txt",
                                        Uname:    "strings",
                                        Gname:    "strings",
                                },
                                // no contents
                        },
                },
        },
        // The truncated test file was produced using these commands:
        //   dd if=/dev/zero bs=1048576 count=16384 > /tmp/16gig.txt
        //   tar -b 1 -c -f- /tmp/16gig.txt | dd bs=512 count=8 > writer-big.tar
        {
                file: "testdata/writer-big.tar",
                entries: []*writerTestEntry{
                        {
                                header: &Header{
                                        Name:     "tmp/16gig.txt",
                                        Mode:     0640,
                                        Uid:      73025,
                                        Gid:      5000,
                                        Size:     16 << 30,
                                        ModTime:  time.Unix(1254699560, 0),
                                        Typeflag: '0',
                                        Uname:    "dsymonds",
                                        Gname:    "eng",
                                },
                                // no contents
                        },
                },
        },
}
 
// Render byte array in a two-character hexadecimal string, spaced for easy visual inspection.
func bytestr(offset int, b []byte) string {
        const rowLen = 32
        s := fmt.Sprintf("%04x ", offset)
        for _, ch := range b {
                switch {
                case '0' <= ch && ch <= '9', 'A' <= ch && ch <= 'Z', 'a' <= ch && ch <= 'z':
                        s += fmt.Sprintf("  %c", ch)
                default:
                        s += fmt.Sprintf(" %02x", ch)
                }
        }
        return s
}
 
// Render a pseudo-diff between two blocks of bytes.
func bytediff(a []byte, b []byte) string {
        const rowLen = 32
        s := fmt.Sprintf("(%d bytes vs. %d bytes)\n", len(a), len(b))
        for offset := 0; len(a)+len(b) > 0; offset += rowLen {
                na, nb := rowLen, rowLen
                if na > len(a) {
                        na = len(a)
                }
                if nb > len(b) {
                        nb = len(b)
                }
                sa := bytestr(offset, a[0:na])
                sb := bytestr(offset, b[0:nb])
                if sa != sb {
                        s += fmt.Sprintf("-%v\n+%v\n", sa, sb)
                }
                a = a[na:]
                b = b[nb:]
        }
        return s
}
 
func TestWriter(t *testing.T) {
testLoop:
        for i, test := range writerTests {
                expected, err := ioutil.ReadFile(test.file)
                if err != nil {
                        t.Errorf("test %d: Unexpected error: %v", i, err)
                        continue
                }
 
                buf := new(bytes.Buffer)
                tw := NewWriter(iotest.TruncateWriter(buf, 4<<10)) // only catch the first 4 KB
                for j, entry := range test.entries {
                        if err := tw.WriteHeader(entry.header); err != nil {
                                t.Errorf("test %d, entry %d: Failed writing header: %v", i, j, err)
                                continue testLoop
                        }
                        if _, err := io.WriteString(tw, entry.contents); err != nil {
                                t.Errorf("test %d, entry %d: Failed writing contents: %v", i, j, err)
                                continue testLoop
                        }
                }
                if err := tw.Close(); err != nil {
                        t.Errorf("test %d: Failed closing archive: %v", i, err)
                        continue testLoop
                }
 
                actual := buf.Bytes()
                if !bytes.Equal(expected, actual) {
                        t.Errorf("test %d: Incorrect result: (-=expected, +=actual)\n%v",
                                i, bytediff(expected, actual))
                }
                if testing.Short() { // The second test is expensive.
                        break
                }
        }
}

Line No.	Rev	Author	Line
1	747	jeremybenn	`// Copyright 2009 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			`package tar`
6
7			`import (`
8			`"bytes"`
9			`"fmt"`
10			`"io"`
11			`"io/ioutil"`
12			`"testing"`
13			`"testing/iotest"`
14			`"time"`
15			`)`
16
17			`type writerTestEntry struct {`
18			`header *Header`
19			`contents string`
20			`}`
21
22			`type writerTest struct {`
23			`file string // filename of expected output`
24			`entries []*writerTestEntry`
25			`}`
26
27			`var writerTests = []*writerTest{`
28			`// The writer test file was produced with this command:`
29			`// tar (GNU tar) 1.26`
30			`// ln -s small.txt link.txt`
31			`// tar -b 1 --format=ustar -c -f writer.tar small.txt small2.txt link.txt`
32			`{`
33			`file: "testdata/writer.tar",`
34			`entries: []*writerTestEntry{`
35			`{`
36			`header: &Header{`
37			`Name: "small.txt",`
38			`Mode: 0640,`
39			`Uid: 73025,`
40			`Gid: 5000,`
41			`Size: 5,`
42			`ModTime: time.Unix(1246508266, 0),`
43			`Typeflag: '0',`
44			`Uname: "dsymonds",`
45			`Gname: "eng",`
46			`},`
47			`contents: "Kilts",`
48			`},`
49			`{`
50			`header: &Header{`
51			`Name: "small2.txt",`
52			`Mode: 0640,`
53			`Uid: 73025,`
54			`Gid: 5000,`
55			`Size: 11,`
56			`ModTime: time.Unix(1245217492, 0),`
57			`Typeflag: '0',`
58			`Uname: "dsymonds",`
59			`Gname: "eng",`
60			`},`
61			`contents: "Google.com\n",`
62			`},`
63			`{`
64			`header: &Header{`
65			`Name: "link.txt",`
66			`Mode: 0777,`
67			`Uid: 1000,`
68			`Gid: 1000,`
69			`Size: 0,`
70			`ModTime: time.Unix(1314603082, 0),`
71			`Typeflag: '2',`
72			`Linkname: "small.txt",`
73			`Uname: "strings",`
74			`Gname: "strings",`
75			`},`
76			`// no contents`
77			`},`
78			`},`
79			`},`
80			`// The truncated test file was produced using these commands:`
81			`// dd if=/dev/zero bs=1048576 count=16384 > /tmp/16gig.txt`
82			`// tar -b 1 -c -f- /tmp/16gig.txt \| dd bs=512 count=8 > writer-big.tar`
83			`{`
84			`file: "testdata/writer-big.tar",`
85			`entries: []*writerTestEntry{`
86			`{`
87			`header: &Header{`
88			`Name: "tmp/16gig.txt",`
89			`Mode: 0640,`
90			`Uid: 73025,`
91			`Gid: 5000,`
92			`Size: 16 << 30,`
93			`ModTime: time.Unix(1254699560, 0),`
94			`Typeflag: '0',`
95			`Uname: "dsymonds",`
96			`Gname: "eng",`
97			`},`
98			`// no contents`
99			`},`
100			`},`
101			`},`
102			`}`
103
104			`// Render byte array in a two-character hexadecimal string, spaced for easy visual inspection.`
105			`func bytestr(offset int, b []byte) string {`
106			`const rowLen = 32`
107			`s := fmt.Sprintf("%04x ", offset)`
108			`for _, ch := range b {`
109			`switch {`
110			`case '0' <= ch && ch <= '9', 'A' <= ch && ch <= 'Z', 'a' <= ch && ch <= 'z':`
111			`s += fmt.Sprintf(" %c", ch)`
112			`default:`
113			`s += fmt.Sprintf(" %02x", ch)`
114			`}`
115			`}`
116			`return s`
117			`}`
118
119			`// Render a pseudo-diff between two blocks of bytes.`
120			`func bytediff(a []byte, b []byte) string {`
121			`const rowLen = 32`
122			`s := fmt.Sprintf("(%d bytes vs. %d bytes)\n", len(a), len(b))`
123			`for offset := 0; len(a)+len(b) > 0; offset += rowLen {`
124			`na, nb := rowLen, rowLen`
125			`if na > len(a) {`
126			`na = len(a)`
127			`}`
128			`if nb > len(b) {`
129			`nb = len(b)`
130			`}`
131			`sa := bytestr(offset, a[0:na])`
132			`sb := bytestr(offset, b[0:nb])`
133			`if sa != sb {`
134			`s += fmt.Sprintf("-%v\n+%v\n", sa, sb)`
135			`}`
136			`a = a[na:]`
137			`b = b[nb:]`
138			`}`
139			`return s`
140			`}`
141
142			`func TestWriter(t *testing.T) {`
143			`testLoop:`
144			`for i, test := range writerTests {`
145			`expected, err := ioutil.ReadFile(test.file)`
146			`if err != nil {`
147			`t.Errorf("test %d: Unexpected error: %v", i, err)`
148			`continue`
149			`}`
150
151			`buf := new(bytes.Buffer)`
152			`tw := NewWriter(iotest.TruncateWriter(buf, 4<<10)) // only catch the first 4 KB`
153			`for j, entry := range test.entries {`
154			`if err := tw.WriteHeader(entry.header); err != nil {`
155			`t.Errorf("test %d, entry %d: Failed writing header: %v", i, j, err)`
156			`continue testLoop`
157			`}`
158			`if _, err := io.WriteString(tw, entry.contents); err != nil {`
159			`t.Errorf("test %d, entry %d: Failed writing contents: %v", i, j, err)`
160			`continue testLoop`
161			`}`
162			`}`
163			`if err := tw.Close(); err != nil {`
164			`t.Errorf("test %d: Failed closing archive: %v", i, err)`
165			`continue testLoop`
166			`}`
167
168			`actual := buf.Bytes()`
169			`if !bytes.Equal(expected, actual) {`
170			`t.Errorf("test %d: Incorrect result: (-=expected, +=actual)\n%v",`
171			`i, bytediff(expected, actual))`
172			`}`
173			`if testing.Short() { // The second test is expensive.`
174			`break`
175			`}`
176			`}`
177			`}`

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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [archive/] [tar/] [writer_test.go] - Blame information for rev 774