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
|
//go:build arm64 && !purego
// +build arm64,!purego
package base64
import (
"encoding/base64"
)
const (
encLutSize = 16
decLutSize = 2
minEncodeLen = 16 * 3
minDecodeLen = 8 * 4
)
func newEncoding(encoder string) *Encoding {
e := &Encoding{base: base64.NewEncoding(encoder)}
e.enableEncodeARM64(encoder)
e.enableDecodeARM64(encoder)
return e
}
func (e *Encoding) enableEncodeARM64(encoder string) {
c62, c63 := int8(encoder[62]), int8(encoder[63])
tab := [encLutSize]int8{
'a' - 26, '0' - 52, '0' - 52, '0' - 52, '0' - 52, '0' - 52, '0' - 52, '0' - 52,
'0' - 52, '0' - 52, '0' - 52, c62 - 62, c63 - 63, 'A', 0, 0,
}
e.enc = encodeARM64
e.enclut = tab
}
func (e *Encoding) enableDecodeARM64(encoder string) {
if encoder == encodeStd {
e.dec = decodeStdARM64
} else {
e.dec = decodeARM64
}
e.declut = [decLutSize]int8{int8(encoder[62]), int8(encoder[63])}
}
|
