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445 lines
12 KiB
445 lines
12 KiB
/* |
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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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/* |
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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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