--- /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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