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
|
package blockbrotli
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"github.com/andybalholm/brotli"
"github.com/ydb-platform/ydb/library/go/blockcodecs"
)
type brotliCodec int
func (b brotliCodec) ID() blockcodecs.CodecID {
switch b {
case 1:
return 48947
case 10:
return 43475
case 11:
return 7241
case 2:
return 63895
case 3:
return 11408
case 4:
return 47136
case 5:
return 45284
case 6:
return 63219
case 7:
return 59675
case 8:
return 40233
case 9:
return 10380
default:
panic("unsupported level")
}
}
func (b brotliCodec) Name() string {
return fmt.Sprintf("brotli_%d", b)
}
func (b brotliCodec) DecodedLen(in []byte) (int, error) {
return blockcodecs.DecodedLen(in)
}
func (b brotliCodec) Encode(dst, src []byte) ([]byte, error) {
if cap(dst) < 8 {
dst = make([]byte, 8)
}
dst = dst[:8]
binary.LittleEndian.PutUint64(dst, uint64(len(src)))
wb := bytes.NewBuffer(dst)
w := brotli.NewWriterLevel(wb, int(b))
if _, err := w.Write(src); err != nil {
return nil, err
}
if err := w.Close(); err != nil {
return nil, err
}
return wb.Bytes(), nil
}
func (b brotliCodec) Decode(dst, src []byte) ([]byte, error) {
if len(src) < 8 {
return nil, fmt.Errorf("short block: %d < 8", len(src))
}
rb := bytes.NewBuffer(src[8:])
r := brotli.NewReader(rb)
_, err := io.ReadFull(r, dst)
if err != nil {
return nil, err
}
return dst, nil
}
func init() {
for i := 1; i <= 11; i++ {
blockcodecs.Register(brotliCodec(i))
}
}
|
