+++ /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 simplifiedchinese
-
-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"
-)
-
-var (
- // GB18030 is the GB18030 encoding.
- GB18030 encoding.Encoding = &gbk18030
- // GBK is the GBK encoding. It encodes an extension of the GB2312 character set
- // and is also known as Code Page 936.
- GBK encoding.Encoding = &gbk
-)
-
-var gbk = internal.Encoding{
- &internal.SimpleEncoding{
- gbkDecoder{gb18030: false},
- gbkEncoder{gb18030: false},
- },
- "GBK",
- identifier.GBK,
-}
-
-var gbk18030 = internal.Encoding{
- &internal.SimpleEncoding{
- gbkDecoder{gb18030: true},
- gbkEncoder{gb18030: true},
- },
- "GB18030",
- identifier.GB18030,
-}
-
-type gbkDecoder struct {
- transform.NopResetter
- gb18030 bool
-}
-
-func (d gbkDecoder) 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
-
- // Microsoft's Code Page 936 extends GBK 1.0 to encode the euro sign U+20AC
- // as 0x80. The HTML5 specification at http://encoding.spec.whatwg.org/#gbk
- // says to treat "gbk" as Code Page 936.
- case c0 == 0x80:
- r, size = '€', 1
-
- case c0 < 0xff:
- if nSrc+1 >= len(src) {
- if !atEOF {
- err = transform.ErrShortSrc
- break loop
- }
- r, size = utf8.RuneError, 1
- goto write
- }
- c1 := src[nSrc+1]
- switch {
- case 0x40 <= c1 && c1 < 0x7f:
- c1 -= 0x40
- case 0x80 <= c1 && c1 < 0xff:
- c1 -= 0x41
- case d.gb18030 && 0x30 <= c1 && c1 < 0x40:
- if nSrc+3 >= len(src) {
- if !atEOF {
- err = transform.ErrShortSrc
- break loop
- }
- // The second byte here is always ASCII, so we can set size
- // to 1 in all cases.
- r, size = utf8.RuneError, 1
- goto write
- }
- c2 := src[nSrc+2]
- if c2 < 0x81 || 0xff <= c2 {
- r, size = utf8.RuneError, 1
- goto write
- }
- c3 := src[nSrc+3]
- if c3 < 0x30 || 0x3a <= c3 {
- r, size = utf8.RuneError, 1
- goto write
- }
- size = 4
- r = ((rune(c0-0x81)*10+rune(c1-0x30))*126+rune(c2-0x81))*10 + rune(c3-0x30)
- if r < 39420 {
- i, j := 0, len(gb18030)
- for i < j {
- h := i + (j-i)/2
- if r >= rune(gb18030[h][0]) {
- i = h + 1
- } else {
- j = h
- }
- }
- dec := &gb18030[i-1]
- r += rune(dec[1]) - rune(dec[0])
- goto write
- }
- r -= 189000
- if 0 <= r && r < 0x100000 {
- r += 0x10000
- } else {
- r, size = utf8.RuneError, 1
- }
- goto write
- default:
- r, size = utf8.RuneError, 1
- goto write
- }
- r, size = '\ufffd', 2
- if i := int(c0-0x81)*190 + int(c1); i < len(decode) {
- r = rune(decode[i])
- if r == 0 {
- r = '\ufffd'
- }
- }
-
- default:
- r, size = utf8.RuneError, 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 gbkEncoder struct {
- transform.NopResetter
- gb18030 bool
-}
-
-func (e gbkEncoder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
- r, r2, size := rune(0), 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 r2 = rune(encode0[r-encode0Low]); r2 != 0 {
- goto write2
- }
- case encode1Low <= r && r < encode1High:
- // Microsoft's Code Page 936 extends GBK 1.0 to encode the euro sign U+20AC
- // as 0x80. The HTML5 specification at http://encoding.spec.whatwg.org/#gbk
- // says to treat "gbk" as Code Page 936.
- if r == '€' {
- r = 0x80
- goto write1
- }
- if r2 = rune(encode1[r-encode1Low]); r2 != 0 {
- goto write2
- }
- case encode2Low <= r && r < encode2High:
- if r2 = rune(encode2[r-encode2Low]); r2 != 0 {
- goto write2
- }
- case encode3Low <= r && r < encode3High:
- if r2 = rune(encode3[r-encode3Low]); r2 != 0 {
- goto write2
- }
- case encode4Low <= r && r < encode4High:
- if r2 = rune(encode4[r-encode4Low]); r2 != 0 {
- goto write2
- }
- }
-
- if e.gb18030 {
- if r < 0x10000 {
- i, j := 0, len(gb18030)
- for i < j {
- h := i + (j-i)/2
- if r >= rune(gb18030[h][1]) {
- i = h + 1
- } else {
- j = h
- }
- }
- dec := &gb18030[i-1]
- r += rune(dec[0]) - rune(dec[1])
- goto write4
- } else if r < 0x110000 {
- r += 189000 - 0x10000
- goto write4
- }
- }
- err = internal.ErrASCIIReplacement
- break
- }
-
- write1:
- if nDst >= len(dst) {
- err = transform.ErrShortDst
- break
- }
- dst[nDst] = uint8(r)
- nDst++
- continue
-
- write2:
- if nDst+2 > len(dst) {
- err = transform.ErrShortDst
- break
- }
- dst[nDst+0] = uint8(r2 >> 8)
- dst[nDst+1] = uint8(r2)
- nDst += 2
- continue
-
- write4:
- if nDst+4 > len(dst) {
- err = transform.ErrShortDst
- break
- }
- dst[nDst+3] = uint8(r%10 + 0x30)
- r /= 10
- dst[nDst+2] = uint8(r%126 + 0x81)
- r /= 126
- dst[nDst+1] = uint8(r%10 + 0x30)
- r /= 10
- dst[nDst+0] = uint8(r + 0x81)
- nDst += 4
- continue
- }
- return nDst, nSrc, err
-}
-
-func init() {
- // Check that the hard-coded encode switch covers all tables.
- if numEncodeTables != 5 {
- panic("bad numEncodeTables")
- }
-}
OSDN Git Service
