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- // 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 korean
- import (
- "errors"
- "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"
- )
- // All is a list of all defined encodings in this package.
- var All = []encoding.Encoding{EUCKR}
- // EUCKR is the EUC-KR encoding, also known as Code Page 949.
- var EUCKR encoding.Encoding = &eucKR
- var eucKR = internal.Encoding{
- &internal.SimpleEncoding{eucKRDecoder{}, eucKREncoder{}},
- "EUC-KR",
- identifier.EUCKR,
- }
- var errInvalidEUCKR = errors.New("korean: invalid EUC-KR encoding")
- type eucKRDecoder struct{ transform.NopResetter }
- func (eucKRDecoder) 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 0x81 <= c0 && c0 < 0xff:
- if nSrc+1 >= len(src) {
- err = transform.ErrShortSrc
- break loop
- }
- c1 := src[nSrc+1]
- if c0 < 0xc7 {
- r = 178 * rune(c0-0x81)
- switch {
- case 0x41 <= c1 && c1 < 0x5b:
- r += rune(c1) - (0x41 - 0*26)
- case 0x61 <= c1 && c1 < 0x7b:
- r += rune(c1) - (0x61 - 1*26)
- case 0x81 <= c1 && c1 < 0xff:
- r += rune(c1) - (0x81 - 2*26)
- default:
- err = errInvalidEUCKR
- break loop
- }
- } else if 0xa1 <= c1 && c1 < 0xff {
- r = 178*(0xc7-0x81) + rune(c0-0xc7)*94 + rune(c1-0xa1)
- } else {
- err = errInvalidEUCKR
- break loop
- }
- if int(r) < len(decode) {
- r = rune(decode[r])
- if r == 0 {
- r = '\ufffd'
- }
- } else {
- r = '\ufffd'
- }
- size = 2
- default:
- err = errInvalidEUCKR
- break loop
- }
- if nDst+utf8.RuneLen(r) > len(dst) {
- err = transform.ErrShortDst
- break loop
- }
- nDst += utf8.EncodeRune(dst[nDst:], r)
- }
- if atEOF && err == transform.ErrShortSrc {
- err = errInvalidEUCKR
- }
- return nDst, nSrc, err
- }
- type eucKREncoder struct{ transform.NopResetter }
- func (eucKREncoder) 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
- if nDst >= len(dst) {
- err = transform.ErrShortDst
- break
- }
- dst[nDst] = uint8(r)
- nDst++
- continue
- } 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 write2
- }
- case encode1Low <= r && r < encode1High:
- if r = rune(encode1[r-encode1Low]); r != 0 {
- goto write2
- }
- case encode2Low <= r && r < encode2High:
- if r = rune(encode2[r-encode2Low]); r != 0 {
- goto write2
- }
- case encode3Low <= r && r < encode3High:
- if r = rune(encode3[r-encode3Low]); r != 0 {
- goto write2
- }
- case encode4Low <= r && r < encode4High:
- if r = rune(encode4[r-encode4Low]); r != 0 {
- goto write2
- }
- case encode5Low <= r && r < encode5High:
- if r = rune(encode5[r-encode5Low]); r != 0 {
- goto write2
- }
- case encode6Low <= r && r < encode6High:
- if r = rune(encode6[r-encode6Low]); r != 0 {
- goto write2
- }
- }
- err = internal.ErrASCIIReplacement
- break
- }
- write2:
- if nDst+2 > len(dst) {
- err = transform.ErrShortDst
- break
- }
- dst[nDst+0] = uint8(r >> 8)
- dst[nDst+1] = uint8(r)
- nDst += 2
- continue
- }
- return nDst, nSrc, err
- }
- func init() {
- // Check that the hard-coded encode switch covers all tables.
- if numEncodeTables != 7 {
- panic("bad numEncodeTables")
- }
- }
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