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
|
package objfile
import (
"errors"
"io"
"strconv"
"gopkg.in/src-d/go-git.v3/core"
)
var (
// ErrClosed is returned when the objfile Reader or Writer is already closed.
ErrClosed = errors.New("objfile: already closed")
// ErrHeader is returned when the objfile has an invalid header.
ErrHeader = errors.New("objfile: invalid header")
)
type header struct {
t core.ObjectType
size int64
}
func (h *header) Read(r io.Reader) error {
t, err := h.readSlice(r, ' ')
if err != nil {
return err
}
h.t, err = core.ParseObjectType(string(t))
if err != nil {
return err
}
size, err := h.readSlice(r, 0)
if err != nil {
return err
}
h.size, err = strconv.ParseInt(string(size), 10, 64)
if err != nil {
return err
}
return nil
}
func (h *header) Write(w io.Writer) error {
b := h.t.Bytes()
b = append(b, ' ')
b = append(b, []byte(strconv.FormatInt(h.size, 10))...)
b = append(b, 0)
_, err := w.Write(b)
return err
}
// readSlice reads one byte at a time from r until it encounters delim or an
// error.
func (h *header) readSlice(r io.Reader, delim byte) ([]byte, error) {
var buf [1]byte
value := make([]byte, 0, 16)
for {
if n, err := r.Read(buf[:]); err != nil && (err != io.EOF || n == 0) {
if err == io.EOF {
return nil, ErrHeader
}
return nil, err
}
if buf[0] == delim {
return value, nil
}
value = append(value, buf[0])
}
}
|
