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179 lines
4.0 KiB
Go
179 lines
4.0 KiB
Go
8 years ago
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// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package korean
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import (
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"errors"
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"unicode/utf8"
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"golang.org/x/text/encoding"
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"golang.org/x/text/encoding/internal"
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"golang.org/x/text/encoding/internal/identifier"
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"golang.org/x/text/transform"
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)
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// All is a list of all defined encodings in this package.
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var All = []encoding.Encoding{EUCKR}
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// EUCKR is the EUC-KR encoding, also known as Code Page 949.
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var EUCKR encoding.Encoding = &eucKR
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var eucKR = internal.Encoding{
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&internal.SimpleEncoding{eucKRDecoder{}, eucKREncoder{}},
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"EUC-KR",
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identifier.EUCKR,
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}
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var errInvalidEUCKR = errors.New("korean: invalid EUC-KR encoding")
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type eucKRDecoder struct{ transform.NopResetter }
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func (eucKRDecoder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
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r, size := rune(0), 0
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loop:
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for ; nSrc < len(src); nSrc += size {
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switch c0 := src[nSrc]; {
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case c0 < utf8.RuneSelf:
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r, size = rune(c0), 1
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case 0x81 <= c0 && c0 < 0xff:
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if nSrc+1 >= len(src) {
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err = transform.ErrShortSrc
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break loop
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}
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c1 := src[nSrc+1]
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if c0 < 0xc7 {
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r = 178 * rune(c0-0x81)
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switch {
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case 0x41 <= c1 && c1 < 0x5b:
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r += rune(c1) - (0x41 - 0*26)
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case 0x61 <= c1 && c1 < 0x7b:
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r += rune(c1) - (0x61 - 1*26)
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case 0x81 <= c1 && c1 < 0xff:
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r += rune(c1) - (0x81 - 2*26)
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default:
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err = errInvalidEUCKR
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break loop
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}
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} else if 0xa1 <= c1 && c1 < 0xff {
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r = 178*(0xc7-0x81) + rune(c0-0xc7)*94 + rune(c1-0xa1)
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} else {
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err = errInvalidEUCKR
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break loop
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}
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if int(r) < len(decode) {
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r = rune(decode[r])
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if r == 0 {
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r = '\ufffd'
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}
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} else {
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r = '\ufffd'
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}
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size = 2
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default:
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err = errInvalidEUCKR
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break loop
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}
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if nDst+utf8.RuneLen(r) > len(dst) {
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err = transform.ErrShortDst
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break loop
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}
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nDst += utf8.EncodeRune(dst[nDst:], r)
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}
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if atEOF && err == transform.ErrShortSrc {
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err = errInvalidEUCKR
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}
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return nDst, nSrc, err
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}
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type eucKREncoder struct{ transform.NopResetter }
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func (eucKREncoder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
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r, size := rune(0), 0
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for ; nSrc < len(src); nSrc += size {
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r = rune(src[nSrc])
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// Decode a 1-byte rune.
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if r < utf8.RuneSelf {
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size = 1
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if nDst >= len(dst) {
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err = transform.ErrShortDst
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break
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}
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dst[nDst] = uint8(r)
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nDst++
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continue
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} else {
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// Decode a multi-byte rune.
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r, size = utf8.DecodeRune(src[nSrc:])
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if size == 1 {
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// All valid runes of size 1 (those below utf8.RuneSelf) were
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// handled above. We have invalid UTF-8 or we haven't seen the
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// full character yet.
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if !atEOF && !utf8.FullRune(src[nSrc:]) {
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err = transform.ErrShortSrc
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break
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}
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}
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// func init checks that the switch covers all tables.
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switch {
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case encode0Low <= r && r < encode0High:
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if r = rune(encode0[r-encode0Low]); r != 0 {
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goto write2
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}
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case encode1Low <= r && r < encode1High:
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if r = rune(encode1[r-encode1Low]); r != 0 {
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goto write2
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}
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case encode2Low <= r && r < encode2High:
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if r = rune(encode2[r-encode2Low]); r != 0 {
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goto write2
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}
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case encode3Low <= r && r < encode3High:
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if r = rune(encode3[r-encode3Low]); r != 0 {
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goto write2
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}
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case encode4Low <= r && r < encode4High:
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if r = rune(encode4[r-encode4Low]); r != 0 {
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goto write2
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}
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case encode5Low <= r && r < encode5High:
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if r = rune(encode5[r-encode5Low]); r != 0 {
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goto write2
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}
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case encode6Low <= r && r < encode6High:
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if r = rune(encode6[r-encode6Low]); r != 0 {
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goto write2
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}
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}
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err = internal.ErrASCIIReplacement
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break
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}
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write2:
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if nDst+2 > len(dst) {
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err = transform.ErrShortDst
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break
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}
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dst[nDst+0] = uint8(r >> 8)
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dst[nDst+1] = uint8(r)
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nDst += 2
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continue
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}
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return nDst, nSrc, err
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}
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func init() {
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// Check that the hard-coded encode switch covers all tables.
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if numEncodeTables != 7 {
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panic("bad numEncodeTables")
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}
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}
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