-
Notifications
You must be signed in to change notification settings - Fork 74
/
gzip.go
88 lines (73 loc) · 1.91 KB
/
gzip.go
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
//
// Copyright (C) 2019-2020 Vdaas.org Vald team ( kpango, rinx, kmrmt )
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Package compress provides compress functions
package compress
import (
"bytes"
"io"
"reflect"
"github.com/klauspost/compress/gzip"
"github.com/vdaas/vald/internal/errors"
)
type gzipCompressor struct {
gobc Compressor
compressionLevel int
}
func NewGzip(opts ...GzipOption) (Compressor, error) {
c := new(gzipCompressor)
for _, opt := range append(defaultGzipOpts, opts...) {
if err := opt(c); err != nil {
return nil, errors.ErrOptionFailed(err, reflect.ValueOf(opt))
}
}
return c, nil
}
func (g *gzipCompressor) CompressVector(vector []float32) ([]byte, error) {
buf := new(bytes.Buffer)
gw, err := gzip.NewWriterLevel(buf, g.compressionLevel)
if err != nil {
return nil, err
}
gob, err := g.gobc.CompressVector(vector)
if err != nil {
return nil, err
}
_, err = gw.Write(gob)
if err != nil {
return nil, err
}
err = gw.Close()
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (g *gzipCompressor) DecompressVector(bs []byte) ([]float32, error) {
buf := new(bytes.Buffer)
gr, err := gzip.NewReader(bytes.NewBuffer(bs))
if err != nil {
return nil, err
}
_, err = io.Copy(buf, gr)
if err != nil {
return nil, err
}
vec, err := g.gobc.DecompressVector(buf.Bytes())
if err != nil {
return nil, err
}
return vec, nil
}