/
digest_reader.go
70 lines (57 loc) · 1.34 KB
/
digest_reader.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
package tsm1
import (
"bufio"
"compress/gzip"
"encoding/binary"
"io"
)
type DigestReader struct {
r io.ReadCloser
gr *gzip.Reader
}
func NewDigestReader(r io.ReadCloser) (*DigestReader, error) {
gr, err := gzip.NewReader(bufio.NewReader(r))
if err != nil {
return nil, err
}
return &DigestReader{r: r, gr: gr}, nil
}
func (w *DigestReader) ReadTimeSpan() (string, *DigestTimeSpan, error) {
var n uint16
if err := binary.Read(w.gr, binary.BigEndian, &n); err != nil {
return "", nil, err
}
b := make([]byte, n)
if _, err := io.ReadFull(w.gr, b); err != nil {
return "", nil, err
}
var cnt uint32
if err := binary.Read(w.gr, binary.BigEndian, &cnt); err != nil {
return "", nil, err
}
ts := &DigestTimeSpan{}
for i := 0; i < int(cnt); i++ {
var min, max int64
var crc uint32
if err := binary.Read(w.gr, binary.BigEndian, &min); err != nil {
return "", nil, err
}
if err := binary.Read(w.gr, binary.BigEndian, &max); err != nil {
return "", nil, err
}
if err := binary.Read(w.gr, binary.BigEndian, &crc); err != nil {
return "", nil, err
}
if err := binary.Read(w.gr, binary.BigEndian, &n); err != nil {
return "", nil, err
}
ts.Add(min, max, int(n), crc)
}
return string(b), ts, nil
}
func (w *DigestReader) Close() error {
if err := w.gr.Close(); err != nil {
return err
}
return w.r.Close()
}