+++ /dev/null
-// 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"
-)
-
-// EUCJP is the EUC-JP encoding.
-var EUCJP encoding.Encoding = &eucJP
-
-var eucJP = internal.Encoding{
- &internal.SimpleEncoding{eucJPDecoder{}, eucJPEncoder{}},
- "EUC-JP",
- identifier.EUCPkdFmtJapanese,
-}
-
-type eucJPDecoder struct{ transform.NopResetter }
-
-// See https://encoding.spec.whatwg.org/#euc-jp-decoder.
-func (eucJPDecoder) 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 c0 == 0x8e:
- if nSrc+1 >= len(src) {
- if !atEOF {
- err = transform.ErrShortSrc
- break loop
- }
- r, size = utf8.RuneError, 1
- break
- }
- c1 := src[nSrc+1]
- switch {
- case c1 < 0xa1:
- r, size = utf8.RuneError, 1
- case c1 > 0xdf:
- r, size = utf8.RuneError, 2
- if c1 == 0xff {
- size = 1
- }
- default:
- r, size = rune(c1)+(0xff61-0xa1), 2
- }
- case c0 == 0x8f:
- if nSrc+2 >= len(src) {
- if !atEOF {
- err = transform.ErrShortSrc
- break loop
- }
- r, size = utf8.RuneError, 1
- if p := nSrc + 1; p < len(src) && 0xa1 <= src[p] && src[p] < 0xfe {
- size = 2
- }
- break
- }
- c1 := src[nSrc+1]
- if c1 < 0xa1 || 0xfe < c1 {
- r, size = utf8.RuneError, 1
- break
- }
- c2 := src[nSrc+2]
- if c2 < 0xa1 || 0xfe < c2 {
- r, size = utf8.RuneError, 2
- break
- }
- r, size = utf8.RuneError, 3
- if i := int(c1-0xa1)*94 + int(c2-0xa1); i < len(jis0212Decode) {
- r = rune(jis0212Decode[i])
- if r == 0 {
- r = utf8.RuneError
- }
- }
-
- case 0xa1 <= c0 && c0 <= 0xfe:
- if nSrc+1 >= len(src) {
- if !atEOF {
- err = transform.ErrShortSrc
- break loop
- }
- r, size = utf8.RuneError, 1
- break
- }
- c1 := src[nSrc+1]
- if c1 < 0xa1 || 0xfe < c1 {
- r, size = utf8.RuneError, 1
- break
- }
- r, size = utf8.RuneError, 2
- if i := int(c0-0xa1)*94 + int(c1-0xa1); i < len(jis0208Decode) {
- r = rune(jis0208Decode[i])
- if r == 0 {
- r = utf8.RuneError
- }
- }
-
- default:
- r, size = utf8.RuneError, 1
- }
-
- if nDst+utf8.RuneLen(r) > len(dst) {
- err = transform.ErrShortDst
- break loop
- }
- nDst += utf8.EncodeRune(dst[nDst:], r)
- }
- return nDst, nSrc, err
-}
-
-type eucJPEncoder struct{ transform.NopResetter }
-
-func (eucJPEncoder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
- r, size := rune(0), 0
- 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
- }
- }
-
- // func init checks that the switch covers all tables.
- switch {
- case encode0Low <= r && r < encode0High:
- if r = rune(encode0[r-encode0Low]); r != 0 {
- goto write2or3
- }
- case encode1Low <= r && r < encode1High:
- if r = rune(encode1[r-encode1Low]); r != 0 {
- goto write2or3
- }
- case encode2Low <= r && r < encode2High:
- if r = rune(encode2[r-encode2Low]); r != 0 {
- goto write2or3
- }
- case encode3Low <= r && r < encode3High:
- if r = rune(encode3[r-encode3Low]); r != 0 {
- goto write2or3
- }
- case encode4Low <= r && r < encode4High:
- if r = rune(encode4[r-encode4Low]); r != 0 {
- goto write2or3
- }
- case encode5Low <= r && r < encode5High:
- if 0xff61 <= r && r < 0xffa0 {
- goto write2
- }
- if r = rune(encode5[r-encode5Low]); r != 0 {
- goto write2or3
- }
- }
- err = internal.ErrASCIIReplacement
- break
- }
-
- if nDst >= len(dst) {
- err = transform.ErrShortDst
- break
- }
- dst[nDst] = uint8(r)
- nDst++
- continue
-
- write2or3:
- if r>>tableShift == jis0208 {
- if nDst+2 > len(dst) {
- err = transform.ErrShortDst
- break
- }
- } else {
- if nDst+3 > len(dst) {
- err = transform.ErrShortDst
- break
- }
- dst[nDst] = 0x8f
- nDst++
- }
- dst[nDst+0] = 0xa1 + uint8(r>>codeShift)&codeMask
- dst[nDst+1] = 0xa1 + uint8(r)&codeMask
- nDst += 2
- continue
-
- write2:
- if nDst+2 > len(dst) {
- err = transform.ErrShortDst
- break
- }
- dst[nDst+0] = 0x8e
- dst[nDst+1] = uint8(r - (0xff61 - 0xa1))
- nDst += 2
- continue
- }
- return nDst, nSrc, err
-}
-
-func init() {
- // Check that the hard-coded encode switch covers all tables.
- if numEncodeTables != 6 {
- panic("bad numEncodeTables")
- }
-}
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