1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
package compression
import (
"bytes"
"errors"
"io"
"os"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestDetectCompression(t *testing.T) {
cases := []string{
"fixtures/Hello.uncompressed",
"fixtures/Hello.gz",
"fixtures/Hello.bz2",
"fixtures/Hello.xz",
"fixtures/Hello.zst",
}
// The original stream is preserved.
for _, c := range cases {
originalContents, err := os.ReadFile(c)
require.NoError(t, err, c)
stream, err := os.Open(c)
require.NoError(t, err, c)
defer stream.Close()
_, updatedStream, err := DetectCompression(stream)
require.NoError(t, err, c)
updatedContents, err := io.ReadAll(updatedStream)
require.NoError(t, err, c)
assert.Equal(t, originalContents, updatedContents, c)
}
// The correct decompressor is chosen, and the result is as expected.
for _, c := range cases {
stream, err := os.Open(c)
require.NoError(t, err, c)
defer stream.Close()
decompressor, updatedStream, err := DetectCompression(stream)
require.NoError(t, err, c)
var uncompressedStream io.Reader
if decompressor == nil {
uncompressedStream = updatedStream
} else {
s, err := decompressor(updatedStream)
require.NoError(t, err)
defer s.Close()
uncompressedStream = s
}
uncompressedContents, err := io.ReadAll(uncompressedStream)
require.NoError(t, err, c)
assert.Equal(t, []byte("Hello"), uncompressedContents, c)
}
// Empty input is handled reasonably.
decompressor, updatedStream, err := DetectCompression(bytes.NewReader([]byte{}))
require.NoError(t, err)
assert.Nil(t, decompressor)
updatedContents, err := io.ReadAll(updatedStream)
require.NoError(t, err)
assert.Equal(t, []byte{}, updatedContents)
// Error reading input
reader, writer := io.Pipe()
defer reader.Close()
err = writer.CloseWithError(errors.New("Expected error reading input in DetectCompression"))
assert.NoError(t, err)
_, _, err = DetectCompression(reader)
assert.Error(t, err)
}
func TestAutoDecompress(t *testing.T) {
cases := []struct {
filename string
isCompressed bool
}{
{"fixtures/Hello.uncompressed", false},
{"fixtures/Hello.gz", true},
{"fixtures/Hello.bz2", true},
{"fixtures/Hello.xz", true},
}
// The correct decompressor is chosen, and the result is as expected.
for _, c := range cases {
stream, err := os.Open(c.filename)
require.NoError(t, err, c.filename)
defer stream.Close()
uncompressedStream, isCompressed, err := AutoDecompress(stream)
require.NoError(t, err, c.filename)
defer uncompressedStream.Close()
assert.Equal(t, c.isCompressed, isCompressed)
uncompressedContents, err := io.ReadAll(uncompressedStream)
require.NoError(t, err, c.filename)
assert.Equal(t, []byte("Hello"), uncompressedContents, c.filename)
}
// Empty input is handled reasonably.
uncompressedStream, isCompressed, err := AutoDecompress(bytes.NewReader([]byte{}))
require.NoError(t, err)
assert.False(t, isCompressed)
uncompressedContents, err := io.ReadAll(uncompressedStream)
require.NoError(t, err)
assert.Equal(t, []byte{}, uncompressedContents)
// Error initializing a decompressor (for a detected format)
_, _, err = AutoDecompress(bytes.NewReader([]byte{0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00}))
assert.Error(t, err)
// Error reading input
reader, writer := io.Pipe()
defer reader.Close()
err = writer.CloseWithError(errors.New("Expected error reading input in AutoDecompress"))
require.NoError(t, err)
_, _, err = AutoDecompress(reader)
assert.Error(t, err)
}
|
