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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
package snappy
import (
"bytes"
"crypto/rand"
"io"
"testing"
"github.com/klauspost/compress/snappy"
goxerialsnappy "github.com/segmentio/kafka-go/compress/snappy/go-xerial-snappy"
)
// Wrap an io.Reader or io.Writer to disable all copy optimizations like
// io.WriterTo or io.ReaderFrom.
// We use this to ensure writes are chunked by io.Copy's internal buffer
// in the tests.
type simpleReader struct{ io.Reader }
type simpleWriter struct{ io.Writer }
func TestXerialReaderSnappy(t *testing.T) {
rawData := new(bytes.Buffer)
rawData.Grow(1024 * 1024)
io.CopyN(rawData, rand.Reader, 1024*1024)
compressedRawData := bytes.NewReader(snappy.Encode(nil, rawData.Bytes()))
decompressedData := new(bytes.Buffer)
io.Copy(decompressedData,
&xerialReader{reader: compressedRawData, decode: snappy.Decode})
b0 := rawData.Bytes()
b1 := decompressedData.Bytes()
if !bytes.Equal(b0, b1) {
t.Error("data mismatch")
}
}
func TestXerialReaderWriter(t *testing.T) {
rawData := new(bytes.Buffer)
rawData.Grow(1024 * 1024)
io.CopyN(rawData, rand.Reader, 1024*1024)
framedData := new(bytes.Buffer)
framedData.Grow(rawData.Len() + 1024)
w := simpleWriter{&xerialWriter{writer: framedData}}
r := simpleReader{bytes.NewReader(rawData.Bytes())}
io.Copy(w, r)
w.Writer.(*xerialWriter).Flush()
unframedData := new(bytes.Buffer)
unframedData.Grow(rawData.Len())
io.Copy(unframedData, &xerialReader{reader: framedData})
b0 := rawData.Bytes()
b1 := unframedData.Bytes()
if !bytes.Equal(b0, b1) {
t.Error("data mismatch")
}
}
func TestXerialFramedCompression(t *testing.T) {
rawData := new(bytes.Buffer)
rawData.Grow(1024 * 1024)
io.CopyN(rawData, rand.Reader, 1024*1024)
framedAndCompressedData := new(bytes.Buffer)
framedAndCompressedData.Grow(rawData.Len())
w := simpleWriter{&xerialWriter{writer: framedAndCompressedData, framed: true, encode: snappy.Encode}}
r := simpleReader{bytes.NewReader(rawData.Bytes())}
io.Copy(w, r)
w.Writer.(*xerialWriter).Flush()
unframedAndDecompressedData := new(bytes.Buffer)
unframedAndDecompressedData.Grow(rawData.Len())
io.Copy(unframedAndDecompressedData,
simpleReader{&xerialReader{reader: framedAndCompressedData, decode: snappy.Decode}})
b0 := rawData.Bytes()
b1 := unframedAndDecompressedData.Bytes()
if !bytes.Equal(b0, b1) {
t.Error("data mismatch")
}
}
func TestXerialFramedCompressionOptimized(t *testing.T) {
rawData := new(bytes.Buffer)
rawData.Grow(1024 * 1024)
io.CopyN(rawData, rand.Reader, 1024*1024)
framedAndCompressedData := new(bytes.Buffer)
framedAndCompressedData.Grow(rawData.Len())
w := &xerialWriter{writer: framedAndCompressedData, framed: true, encode: snappy.Encode}
r := simpleReader{bytes.NewReader(rawData.Bytes())}
io.Copy(w, r)
w.Flush()
unframedAndDecompressedData := new(bytes.Buffer)
unframedAndDecompressedData.Grow(rawData.Len())
io.Copy(unframedAndDecompressedData,
&xerialReader{reader: framedAndCompressedData, decode: snappy.Decode})
b0 := rawData.Bytes()
b1 := unframedAndDecompressedData.Bytes()
if !bytes.Equal(b0, b1) {
t.Error("data mismatch")
}
}
func TestXerialReaderAgainstGoXerialSnappy(t *testing.T) {
rawData := new(bytes.Buffer)
rawData.Grow(1024 * 1024)
io.CopyN(rawData, rand.Reader, 1024*1024)
rawBytes := rawData.Bytes()
framedAndCompressedData := []byte{}
const chunkSize = 999
for i := 0; i < len(rawBytes); i += chunkSize {
j := i + chunkSize
if j > len(rawBytes) {
j = len(rawBytes)
}
framedAndCompressedData = goxerialsnappy.EncodeStream(framedAndCompressedData, rawBytes[i:j])
}
unframedAndDecompressedData := new(bytes.Buffer)
unframedAndDecompressedData.Grow(rawData.Len())
io.Copy(unframedAndDecompressedData,
&xerialReader{reader: bytes.NewReader(framedAndCompressedData), decode: snappy.Decode})
b0 := rawBytes
b1 := unframedAndDecompressedData.Bytes()
if !bytes.Equal(b0, b1) {
t.Error("data mismatch")
}
}
func TestXerialWriterAgainstGoXerialSnappy(t *testing.T) {
rawData := new(bytes.Buffer)
rawData.Grow(1024 * 1024)
io.CopyN(rawData, rand.Reader, 1024*1024)
framedAndCompressedData := new(bytes.Buffer)
framedAndCompressedData.Grow(rawData.Len())
w := &xerialWriter{writer: framedAndCompressedData, framed: true, encode: snappy.Encode}
r := simpleReader{bytes.NewReader(rawData.Bytes())}
io.Copy(w, r)
w.Flush()
unframedAndDecompressedData, err := goxerialsnappy.Decode(framedAndCompressedData.Bytes())
if err != nil {
t.Error(err)
}
b0 := rawData.Bytes()
b1 := unframedAndDecompressedData
if !bytes.Equal(b0, b1) {
t.Error("data mismatch")
}
}
|
