mirror of
https://github.com/octoleo/restic.git
synced 2024-12-05 11:23:14 +00:00
190 lines
4.2 KiB
Go
190 lines
4.2 KiB
Go
|
// Copyright 2013 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 japanese
|
||
|
|
||
|
import (
|
||
|
"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"
|
||
|
)
|
||
|
|
||
|
// ShiftJIS is the Shift JIS encoding, also known as Code Page 932 and
|
||
|
// Windows-31J.
|
||
|
var ShiftJIS encoding.Encoding = &shiftJIS
|
||
|
|
||
|
var shiftJIS = internal.Encoding{
|
||
|
&internal.SimpleEncoding{shiftJISDecoder{}, shiftJISEncoder{}},
|
||
|
"Shift JIS",
|
||
|
identifier.ShiftJIS,
|
||
|
}
|
||
|
|
||
|
type shiftJISDecoder struct{ transform.NopResetter }
|
||
|
|
||
|
func (shiftJISDecoder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
|
||
|
r, size := rune(0), 0
|
||
|
loop:
|
||
|
for ; nSrc < len(src); nSrc += size {
|
||
|
switch c0 := src[nSrc]; {
|
||
|
case c0 < utf8.RuneSelf:
|
||
|
r, size = rune(c0), 1
|
||
|
|
||
|
case 0xa1 <= c0 && c0 < 0xe0:
|
||
|
r, size = rune(c0)+(0xff61-0xa1), 1
|
||
|
|
||
|
case (0x81 <= c0 && c0 < 0xa0) || (0xe0 <= c0 && c0 < 0xfd):
|
||
|
if c0 <= 0x9f {
|
||
|
c0 -= 0x70
|
||
|
} else {
|
||
|
c0 -= 0xb0
|
||
|
}
|
||
|
c0 = 2*c0 - 0x21
|
||
|
|
||
|
if nSrc+1 >= len(src) {
|
||
|
if !atEOF {
|
||
|
err = transform.ErrShortSrc
|
||
|
break loop
|
||
|
}
|
||
|
r, size = '\ufffd', 1
|
||
|
goto write
|
||
|
}
|
||
|
c1 := src[nSrc+1]
|
||
|
switch {
|
||
|
case c1 < 0x40:
|
||
|
r, size = '\ufffd', 1 // c1 is ASCII so output on next round
|
||
|
goto write
|
||
|
case c1 < 0x7f:
|
||
|
c0--
|
||
|
c1 -= 0x40
|
||
|
case c1 == 0x7f:
|
||
|
r, size = '\ufffd', 1 // c1 is ASCII so output on next round
|
||
|
goto write
|
||
|
case c1 < 0x9f:
|
||
|
c0--
|
||
|
c1 -= 0x41
|
||
|
case c1 < 0xfd:
|
||
|
c1 -= 0x9f
|
||
|
default:
|
||
|
r, size = '\ufffd', 2
|
||
|
goto write
|
||
|
}
|
||
|
r, size = '\ufffd', 2
|
||
|
if i := int(c0)*94 + int(c1); i < len(jis0208Decode) {
|
||
|
r = rune(jis0208Decode[i])
|
||
|
if r == 0 {
|
||
|
r = '\ufffd'
|
||
|
}
|
||
|
}
|
||
|
|
||
|
case c0 == 0x80:
|
||
|
r, size = 0x80, 1
|
||
|
|
||
|
default:
|
||
|
r, size = '\ufffd', 1
|
||
|
}
|
||
|
write:
|
||
|
if nDst+utf8.RuneLen(r) > len(dst) {
|
||
|
err = transform.ErrShortDst
|
||
|
break loop
|
||
|
}
|
||
|
nDst += utf8.EncodeRune(dst[nDst:], r)
|
||
|
}
|
||
|
return nDst, nSrc, err
|
||
|
}
|
||
|
|
||
|
type shiftJISEncoder struct{ transform.NopResetter }
|
||
|
|
||
|
func (shiftJISEncoder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
|
||
|
r, size := rune(0), 0
|
||
|
loop:
|
||
|
for ; nSrc < len(src); nSrc += size {
|
||
|
r = rune(src[nSrc])
|
||
|
|
||
|
// Decode a 1-byte rune.
|
||
|
if r < utf8.RuneSelf {
|
||
|
size = 1
|
||
|
|
||
|
} else {
|
||
|
// Decode a multi-byte rune.
|
||
|
r, size = utf8.DecodeRune(src[nSrc:])
|
||
|
if size == 1 {
|
||
|
// All valid runes of size 1 (those below utf8.RuneSelf) were
|
||
|
// handled above. We have invalid UTF-8 or we haven't seen the
|
||
|
// full character yet.
|
||
|
if !atEOF && !utf8.FullRune(src[nSrc:]) {
|
||
|
err = transform.ErrShortSrc
|
||
|
break loop
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// func init checks that the switch covers all tables.
|
||
|
switch {
|
||
|
case encode0Low <= r && r < encode0High:
|
||
|
if r = rune(encode0[r-encode0Low]); r>>tableShift == jis0208 {
|
||
|
goto write2
|
||
|
}
|
||
|
case encode1Low <= r && r < encode1High:
|
||
|
if r = rune(encode1[r-encode1Low]); r>>tableShift == jis0208 {
|
||
|
goto write2
|
||
|
}
|
||
|
case encode2Low <= r && r < encode2High:
|
||
|
if r = rune(encode2[r-encode2Low]); r>>tableShift == jis0208 {
|
||
|
goto write2
|
||
|
}
|
||
|
case encode3Low <= r && r < encode3High:
|
||
|
if r = rune(encode3[r-encode3Low]); r>>tableShift == jis0208 {
|
||
|
goto write2
|
||
|
}
|
||
|
case encode4Low <= r && r < encode4High:
|
||
|
if r = rune(encode4[r-encode4Low]); r>>tableShift == jis0208 {
|
||
|
goto write2
|
||
|
}
|
||
|
case encode5Low <= r && r < encode5High:
|
||
|
if 0xff61 <= r && r < 0xffa0 {
|
||
|
r -= 0xff61 - 0xa1
|
||
|
goto write1
|
||
|
}
|
||
|
if r = rune(encode5[r-encode5Low]); r>>tableShift == jis0208 {
|
||
|
goto write2
|
||
|
}
|
||
|
}
|
||
|
err = internal.ErrASCIIReplacement
|
||
|
break
|
||
|
}
|
||
|
|
||
|
write1:
|
||
|
if nDst >= len(dst) {
|
||
|
err = transform.ErrShortDst
|
||
|
break
|
||
|
}
|
||
|
dst[nDst] = uint8(r)
|
||
|
nDst++
|
||
|
continue
|
||
|
|
||
|
write2:
|
||
|
j1 := uint8(r>>codeShift) & codeMask
|
||
|
j2 := uint8(r) & codeMask
|
||
|
if nDst+2 > len(dst) {
|
||
|
err = transform.ErrShortDst
|
||
|
break loop
|
||
|
}
|
||
|
if j1 <= 61 {
|
||
|
dst[nDst+0] = 129 + j1/2
|
||
|
} else {
|
||
|
dst[nDst+0] = 193 + j1/2
|
||
|
}
|
||
|
if j1&1 == 0 {
|
||
|
dst[nDst+1] = j2 + j2/63 + 64
|
||
|
} else {
|
||
|
dst[nDst+1] = j2 + 159
|
||
|
}
|
||
|
nDst += 2
|
||
|
continue
|
||
|
}
|
||
|
return nDst, nSrc, err
|
||
|
}
|