-
Notifications
You must be signed in to change notification settings - Fork 0
/
header.go
64 lines (61 loc) · 1.37 KB
/
header.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
package util
import (
"encoding/binary"
)
func AddIntHeader(data []byte, headerSize int, header uint64, littleEndian bool) []byte {
pack := make([]byte, headerSize+len(data))
switch headerSize {
case 1:
pack[0] = byte(header)
case 2:
if littleEndian {
binary.LittleEndian.PutUint16(pack, uint16(header))
} else {
binary.BigEndian.PutUint16(pack, uint16(header))
}
case 4:
if littleEndian {
binary.LittleEndian.PutUint32(pack, uint32(header))
} else {
binary.BigEndian.PutUint32(pack, uint32(header))
}
case 8:
if littleEndian {
binary.LittleEndian.PutUint64(pack, header)
} else {
binary.BigEndian.PutUint64(pack, header)
}
default:
panic("wrong header size")
}
copy(pack[headerSize:], data)
return pack
}
func GetIntHeader(data []byte, headerSize int, littleEndian bool) int64 {
var header int64
switch headerSize {
case 1:
header = int64(data[0])
case 2:
if littleEndian {
header = int64(binary.LittleEndian.Uint16(data))
} else {
header = int64(binary.BigEndian.Uint16(data))
}
case 4:
if littleEndian {
header = int64(binary.LittleEndian.Uint32(data))
} else {
header = int64(binary.BigEndian.Uint32(data))
}
case 8:
if littleEndian {
header = int64(binary.LittleEndian.Uint64(data))
} else {
header = int64(binary.BigEndian.Uint64(data))
}
default:
panic("wrong header length")
}
return header
}