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
|
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ianaindex
import (
"unicode"
"unicode/utf8"
"golang.org/x/text/encoding"
"golang.org/x/text/encoding/internal"
"golang.org/x/text/encoding/internal/identifier"
"golang.org/x/text/transform"
)
type asciiDecoder struct {
transform.NopResetter
}
func (d asciiDecoder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
for _, c := range src {
if c > unicode.MaxASCII {
r := unicode.ReplacementChar
if nDst+utf8.RuneLen(r) > len(dst) {
err = transform.ErrShortDst
break
}
nDst += utf8.EncodeRune(dst[nDst:], r)
nSrc++
continue
}
if nDst >= len(dst) {
err = transform.ErrShortDst
break
}
dst[nDst] = c
nDst++
nSrc++
}
return nDst, nSrc, err
}
type asciiEncoder struct {
transform.NopResetter
}
func (d asciiEncoder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
for _, c := range src {
if c > unicode.MaxASCII {
err = internal.RepertoireError(encoding.ASCIISub)
break
}
if nDst >= len(dst) {
err = transform.ErrShortDst
break
}
dst[nDst] = c
nDst++
nSrc++
}
return nDst, nSrc, err
}
var asciiEnc = &internal.Encoding{
Encoding: &internal.SimpleEncoding{
asciiDecoder{},
asciiEncoder{},
},
Name: "US-ASCII",
MIB: identifier.ASCII,
}
|
