diff options
Diffstat (limited to 'vendor/golang.org/x/text/encoding/japanese/eucjp.go')
| -rw-r--r-- | vendor/golang.org/x/text/encoding/japanese/eucjp.go | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/vendor/golang.org/x/text/encoding/japanese/eucjp.go b/vendor/golang.org/x/text/encoding/japanese/eucjp.go new file mode 100644 index 000000000..79313fa58 --- /dev/null +++ b/vendor/golang.org/x/text/encoding/japanese/eucjp.go @@ -0,0 +1,225 @@ +// 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") + } +} |