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446 lines
12 KiB
C
446 lines
12 KiB
C
/*
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* Copyright (C) 1999-2001, 2008, 2011-2012, 2016 Free Software Foundation, Inc.
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* This file is part of the GNU LIBICONV Library.
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*
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* The GNU LIBICONV Library is free software; you can redistribute it
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* and/or modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* The GNU LIBICONV Library is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* ISO-2022-JP-MS
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* alias CP50221
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*
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* This is an extension of ISO-2022-JP-1 with larger character sets.
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* It uses ESC $ B and ESC $ ( D to denote *extensions* of JIS X 0208 and
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* JIS X 0212, respectively. This violates the principles of ISO 2022,
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* where
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* 1. character sets to be used by ISO 2022 have to be registered at the
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* ISO IR registry <http://www.itscj.ipsj.or.jp/ISO-IR/>,
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* 2. different character sets are designated by different escape
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* sequences.
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* It's a typical instance of the "embrace and extend" strategy by Microsoft
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* <http://en.wikipedia.org/wiki/Embrace,_extend_and_extinguish>.
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*/
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/*
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* Windows has three encodings CP50220, CP50221, CP50222.
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* The common parts are:
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* - US-ASCII (0x00..0x7F)
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* - JIS X 0208 extended by
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* - one row (0x2D),
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* - a private use area (rows 0x75..0x7E = U+E000..U+E3AB),
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* enabled with ESC $ B, disabled with ESC ( B.
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* - JIS X 0212 extended by
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* - two rows (0x73..0x74),
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* - a private use area (rows 0x75..0x7E = U+E3AC..U+E757),
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* enabled with ESC $ ( D, disabled with ESC ( B.
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* They differ in the handling of JIS X 0201 characters (halfwidth Katakana)
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* in the conversion direction Unicode -> CP5022x:
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* * CP50220 maps the halfwidth Katakana to fullwidth Katakana characters.
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* * CP50221 contains the JIS X 0201 halfwidth Katakana characters,
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* enabled with ESC ( I, disabled with ESC ( B.
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* * CP50222 contains the JIS X 0201 halfwidth Katakana characters,
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* enabled with ESC ( J 0x0E, disabled with ESC ( B.
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* In the conversion direction CP5022x -> Unicode, all three operate the same:
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* - ESC ( I is supported and understood.
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* - ESC ( J 0x0E is not accepted. (Tested on Windows XP SP3.)
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* Conclusion:
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* - CP50222 should not be used, because the multibyte sequence that it
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* produces cannot be parsed by either of the three encodings.
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* - CP50221 is preferrable to CP50220, because it can faithfully represent
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* the halfwidth Katakana characters.
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* We therefore implement CP50221. As an extension, in the mbtowc conversion
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* direction, we support also ESC ( J 0x0E, just in case.
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*/
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#include "cp50221_0208_ext.h"
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#include "cp50221_0212_ext.h"
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#define ESC 0x1b
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#define SO 0x0e
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#define SI 0x0f
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/*
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* The state can be one of the following values.
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*/
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#define STATE_ASCII 0 /* Esc ( B */
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#define STATE_JISX0201ROMAN 1 /* Esc ( J */ /* only in mbtowc direction */
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#define STATE_JISX0201KATAKANA 2 /* Esc ( I */
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#define STATE_JISX0208MS 3 /* Esc $ @ or Esc $ B */
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#define STATE_JISX0212MS 4 /* Esc $ ( D */
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static int
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iso2022_jpms_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
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{
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state_t state = conv->istate;
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int count = 0;
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unsigned char c;
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for (;;) {
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c = *s;
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if (c == ESC) {
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if (n < count+3)
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goto none;
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if (s[1] == '(') {
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if (s[2] == 'B') {
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state = STATE_ASCII;
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s += 3; count += 3;
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if (n < count+1)
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goto none;
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continue;
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}
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if (s[2] == 'I') {
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state = STATE_JISX0201KATAKANA;
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s += 3; count += 3;
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if (n < count+1)
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goto none;
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continue;
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}
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if (s[2] == 'J') {
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state = STATE_JISX0201ROMAN;
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s += 3; count += 3;
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if (n < count+1)
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goto none;
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continue;
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}
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goto ilseq;
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}
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if (s[1] == '$') {
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if (s[2] == '@' || s[2] == 'B') {
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/* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */
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state = STATE_JISX0208MS;
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s += 3; count += 3;
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if (n < count+1)
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goto none;
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continue;
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}
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if (s[2] == '(') {
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if (n < count+4)
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goto none;
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if (s[3] == 'D') {
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state = STATE_JISX0212MS;
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s += 4; count += 4;
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if (n < count+1)
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goto none;
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continue;
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}
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}
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goto ilseq;
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}
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goto ilseq;
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}
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if (c == SO) {
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if (state == STATE_JISX0201ROMAN)
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state = STATE_JISX0201KATAKANA;
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s += 1; count += 1;
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if (n < count+1)
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goto none;
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continue;
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}
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if (c == SI) {
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if (state == STATE_JISX0201KATAKANA)
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state = STATE_JISX0201ROMAN;
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s += 1; count += 1;
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if (n < count+1)
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goto none;
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continue;
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}
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break;
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}
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switch (state) {
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case STATE_ASCII:
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if (c < 0x80) {
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int ret = ascii_mbtowc(conv,pwc,s,1);
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if (ret == RET_ILSEQ)
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goto ilseq;
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if (ret != 1) abort();
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conv->istate = state;
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return count+1;
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} else
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goto ilseq;
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case STATE_JISX0201ROMAN:
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if (c < 0x80) {
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int ret = jisx0201_mbtowc(conv,pwc,s,1);
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if (ret == RET_ILSEQ)
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goto ilseq;
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if (ret != 1) abort();
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conv->istate = state;
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return count+1;
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} else
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goto ilseq;
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case STATE_JISX0201KATAKANA:
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if (c < 0x80) {
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unsigned char buf = c+0x80;
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int ret = jisx0201_mbtowc(conv,pwc,&buf,1);
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if (ret == RET_ILSEQ)
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goto ilseq;
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if (ret != 1) abort();
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conv->istate = state;
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return count+1;
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} else
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goto ilseq;
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case STATE_JISX0208MS:
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if (n < count+2)
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goto none;
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if (s[0] < 0x80 && s[1] < 0x80) {
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int ret;
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if (s[0] < 0x75) {
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if (s[0] == 0x2d) {
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/* Extension of JIS X 0208. */
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if (s[1] >= 0x21 && s[1] <= 0x79) {
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unsigned char i = (s[1] - 0x21) + 1;
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ret = cp50221_0208_ext_mbtowc(conv,pwc,&i,1);
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if (ret == 1)
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ret = 2;
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} else
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ret = RET_ILSEQ;
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} else {
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/* JIS X 0208. */
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ret = jisx0208_mbtowc(conv,pwc,s,2);
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}
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} else {
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/* Extension of JIS X 0208.
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0x{75..7E}{21..8E} maps to U+E000..U+E3AB.
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But some rows maps to characters present in CP932. */
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if (s[0] <= 0x7e && (s[1] >= 0x21 && s[1] <= 0x7e)) {
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unsigned short wc = 0xfffd;
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if (s[0] >= 0x79 && s[0] <= 0x7c)
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wc = cp932ext_2uni_pageed[(s[0] - 0x79) * 94 + (s[1] - 0x21)];
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if (wc == 0xfffd)
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wc = (s[0] - 0x75) * 94 + (s[1] - 0x21) + 0xe000;
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*pwc = wc;
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ret = 2;
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} else
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ret = RET_ILSEQ;
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}
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if (ret == RET_ILSEQ)
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goto ilseq;
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if (ret != 2) abort();
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conv->istate = state;
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return count+2;
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} else
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goto ilseq;
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case STATE_JISX0212MS:
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if (n < count+2)
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goto none;
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if (s[0] < 0x80 && s[1] < 0x80) {
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int ret;
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if (s[0] < 0x73) {
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/* JIS X 0212. */
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ret = jisx0212_mbtowc(conv,pwc,s,2);
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} else {
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if (s[0] < 0x75) {
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/* Extension of JIS X 0212. */
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if (s[1] >= 0x21 && s[1] <= 0x7e) {
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unsigned char i = (s[0] - 0x73) * 94 + (s[1] - 0x21) + 1;
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ret = cp50221_0212_ext_mbtowc(conv,pwc,&i,1);
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if (ret == 1)
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ret = 2;
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} else
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ret = RET_ILSEQ;
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} else {
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/* Extension of JIS X 0208.
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0x{75..7E}{21..8E} maps to U+E3AC..U+E757. */
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if (s[0] <= 0x7e && (s[1] >= 0x21 && s[1] <= 0x7e)) {
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*pwc = (s[0] - 0x75) * 94 + (s[1] - 0x21) + 0xe3ac;
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ret = 2;
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} else
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ret = RET_ILSEQ;
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}
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}
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if (ret == RET_ILSEQ)
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goto ilseq;
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if (ret != 2) abort();
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conv->istate = state;
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return count+2;
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} else
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goto ilseq;
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default: abort();
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}
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none:
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conv->istate = state;
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return RET_TOOFEW(count);
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ilseq:
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conv->istate = state;
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return RET_SHIFT_ILSEQ(count);
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}
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static int
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iso2022_jpms_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
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{
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state_t state = conv->ostate;
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unsigned char buf[2];
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int ret;
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/* Try ASCII. */
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ret = ascii_wctomb(conv,buf,wc,1);
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if (ret != RET_ILUNI) {
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if (ret != 1) abort();
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if (buf[0] < 0x80) {
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int count = (state == STATE_ASCII ? 1 : 4);
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if (n < count)
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return RET_TOOSMALL;
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if (state != STATE_ASCII) {
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r[0] = ESC;
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r[1] = '(';
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r[2] = 'B';
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r += 3;
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state = STATE_ASCII;
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}
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r[0] = buf[0];
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conv->ostate = state;
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return count;
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}
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}
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/* Try JIS X 0201-1976 Katakana. */
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ret = jisx0201_wctomb(conv,buf,wc,1);
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if (ret != RET_ILUNI) {
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if (ret != 1) abort();
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if (buf[0] >= 0x80) {
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int count = (state == STATE_JISX0201KATAKANA ? 1 : 4);
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if (n < count)
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return RET_TOOSMALL;
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if (state != STATE_JISX0201KATAKANA) {
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r[0] = ESC;
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r[1] = '(';
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r[2] = 'I';
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r += 3;
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state = STATE_JISX0201KATAKANA;
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}
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r[0] = buf[0]-0x80;
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conv->ostate = state;
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return count;
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}
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}
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/* Try JIS X 0208-1990, in place of JIS X 0208-1978 and JIS X 0208-1983,
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and the extensions mentioned above. */
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if (wc >= 0xe000 && wc < 0xe3ac) {
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unsigned short i = wc - 0xe000;
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buf[0] = (i / 94) + 0x75;
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buf[1] = (i % 94) + 0x21;
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ret = 2;
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} else {
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ret = jisx0208_wctomb(conv,buf,wc,2);
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if (ret == RET_ILUNI) {
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/* Extension of JIS X 0208. */
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unsigned char i;
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ret = cp50221_0208_ext_wctomb(conv,&i,wc,1);
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if (ret == 1) {
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buf[0] = 0x2d;
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buf[1] = i-1 + 0x21;
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ret = 2;
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} else if (wc == 0x663B) {
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buf[0] = 0x7a;
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buf[1] = 0x36;
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ret = 2;
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} else if (wc == 0xffe2) {
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buf[0] = 0x7c;
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buf[1] = 0x7b;
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ret = 2;
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} else if (wc == 0xffe4) {
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buf[0] = 0x7c;
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buf[1] = 0x7c;
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ret = 2;
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}
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}
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}
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if (ret != RET_ILUNI) {
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if (ret != 2) abort();
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if (buf[0] < 0x80 && buf[1] < 0x80) {
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int count = (state == STATE_JISX0208MS ? 2 : 5);
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if (n < count)
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return RET_TOOSMALL;
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if (state != STATE_JISX0208MS) {
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r[0] = ESC;
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r[1] = '$';
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r[2] = 'B';
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r += 3;
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state = STATE_JISX0208MS;
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}
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r[0] = buf[0];
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r[1] = buf[1];
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conv->ostate = state;
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return count;
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}
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}
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/* Try JIS X 0212-1990 and the extensions mentioned above. */
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if (wc >= 0xe3ac && wc < 0xe758) {
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unsigned short i = wc - 0xe3ac;
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buf[0] = (i / 94) + 0x75;
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buf[1] = (i % 94) + 0x21;
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ret = 2;
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} else {
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ret = jisx0212_wctomb(conv,buf,wc,2);
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if (ret == RET_ILUNI) {
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/* Extension of JIS X 0212. */
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unsigned char i;
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ret = cp50221_0212_ext_wctomb(conv,&i,wc,1);
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if (ret == 1) {
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i -= 1;
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buf[0] = (i / 94) + 0x73;
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buf[1] = (i % 94) + 0x21;
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ret = 2;
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}
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}
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}
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if (ret != RET_ILUNI) {
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if (ret != 2) abort();
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if (buf[0] < 0x80 && buf[1] < 0x80) {
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int count = (state == STATE_JISX0212MS ? 2 : 6);
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if (n < count)
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return RET_TOOSMALL;
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if (state != STATE_JISX0212MS) {
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r[0] = ESC;
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r[1] = '$';
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r[2] = '(';
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r[3] = 'D';
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r += 4;
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state = STATE_JISX0212MS;
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}
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r[0] = buf[0];
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r[1] = buf[1];
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conv->ostate = state;
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return count;
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}
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}
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return RET_ILUNI;
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}
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static int
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iso2022_jpms_reset (conv_t conv, unsigned char *r, size_t n)
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{
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state_t state = conv->ostate;
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if (state != STATE_ASCII) {
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if (n < 3)
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return RET_TOOSMALL;
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r[0] = ESC;
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r[1] = '(';
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r[2] = 'B';
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/* conv->ostate = 0; will be done by the caller */
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return 3;
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} else
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return 0;
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}
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#undef STATE_JISX0212MS
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#undef STATE_JISX0208MS
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#undef STATE_JISX0201KATAKANA
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#undef STATE_JISX0201ROMAN
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#undef STATE_ASCII
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