| /* |
| * Copyright (C) 1999-2001, 2008, 2011-2012, 2016, 2018 Free Software Foundation, Inc. |
| * This file is part of the GNU LIBICONV Library. |
| * |
| * The GNU LIBICONV Library is free software; you can redistribute it |
| * and/or modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either version 2.1 |
| * of the License, or (at your option) any later version. |
| * |
| * The GNU LIBICONV Library is distributed in the hope that it will be |
| * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with the GNU LIBICONV Library; see the file COPYING.LIB. |
| * If not, see <https://www.gnu.org/licenses/>. |
| */ |
| |
| /* |
| * ISO-2022-JP-MS |
| * alias CP50221 |
| * |
| * This is an extension of ISO-2022-JP-1 with larger character sets. |
| * It uses ESC $ B and ESC $ ( D to denote *extensions* of JIS X 0208 and |
| * JIS X 0212, respectively. This violates the principles of ISO 2022, |
| * where |
| * 1. character sets to be used by ISO 2022 have to be registered at the |
| * ISO IR registry <https://www.itscj.ipsj.or.jp/ISO-IR/>, |
| * 2. different character sets are designated by different escape |
| * sequences. |
| * It's a typical instance of the "embrace and extend" strategy by Microsoft |
| * <https://en.wikipedia.org/wiki/Embrace,_extend_and_extinguish>. |
| */ |
| |
| /* |
| * Windows has three encodings CP50220, CP50221, CP50222. |
| * The common parts are: |
| * - US-ASCII (0x00..0x7F) |
| * - JIS X 0208 extended by |
| * - one row (0x2D), |
| * - a private use area (rows 0x75..0x7E = U+E000..U+E3AB), |
| * enabled with ESC $ B, disabled with ESC ( B. |
| * - JIS X 0212 extended by |
| * - two rows (0x73..0x74), |
| * - a private use area (rows 0x75..0x7E = U+E3AC..U+E757), |
| * enabled with ESC $ ( D, disabled with ESC ( B. |
| * They differ in the handling of JIS X 0201 characters (halfwidth Katakana) |
| * in the conversion direction Unicode -> CP5022x: |
| * * CP50220 maps the halfwidth Katakana to fullwidth Katakana characters. |
| * * CP50221 contains the JIS X 0201 halfwidth Katakana characters, |
| * enabled with ESC ( I, disabled with ESC ( B. |
| * * CP50222 contains the JIS X 0201 halfwidth Katakana characters, |
| * enabled with ESC ( J 0x0E, disabled with ESC ( B. |
| * In the conversion direction CP5022x -> Unicode, all three operate the same: |
| * - ESC ( I is supported and understood. |
| * - ESC ( J 0x0E is not accepted. (Tested on Windows XP SP3.) |
| * Conclusion: |
| * - CP50222 should not be used, because the multibyte sequence that it |
| * produces cannot be parsed by either of the three encodings. |
| * - CP50221 is preferrable to CP50220, because it can faithfully represent |
| * the halfwidth Katakana characters. |
| * We therefore implement CP50221. As an extension, in the mbtowc conversion |
| * direction, we support also ESC ( J 0x0E, just in case. |
| */ |
| |
| #include "cp50221_0208_ext.h" |
| #include "cp50221_0212_ext.h" |
| |
| #define ESC 0x1b |
| #define SO 0x0e |
| #define SI 0x0f |
| |
| /* |
| * The state can be one of the following values. |
| */ |
| #define STATE_ASCII 0 /* Esc ( B */ |
| #define STATE_JISX0201ROMAN 1 /* Esc ( J */ /* only in mbtowc direction */ |
| #define STATE_JISX0201KATAKANA 2 /* Esc ( I */ |
| #define STATE_JISX0208MS 3 /* Esc $ @ or Esc $ B */ |
| #define STATE_JISX0212MS 4 /* Esc $ ( D */ |
| |
| static int |
| iso2022_jpms_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n) |
| { |
| state_t state = conv->istate; |
| int count = 0; |
| unsigned char c; |
| for (;;) { |
| c = *s; |
| if (c == ESC) { |
| if (n < count+3) |
| goto none; |
| if (s[1] == '(') { |
| if (s[2] == 'B') { |
| state = STATE_ASCII; |
| s += 3; count += 3; |
| if (n < count+1) |
| goto none; |
| continue; |
| } |
| if (s[2] == 'I') { |
| state = STATE_JISX0201KATAKANA; |
| s += 3; count += 3; |
| if (n < count+1) |
| goto none; |
| continue; |
| } |
| if (s[2] == 'J') { |
| state = STATE_JISX0201ROMAN; |
| s += 3; count += 3; |
| if (n < count+1) |
| goto none; |
| continue; |
| } |
| goto ilseq; |
| } |
| if (s[1] == '$') { |
| if (s[2] == '@' || s[2] == 'B') { |
| /* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */ |
| state = STATE_JISX0208MS; |
| s += 3; count += 3; |
| if (n < count+1) |
| goto none; |
| continue; |
| } |
| if (s[2] == '(') { |
| if (n < count+4) |
| goto none; |
| if (s[3] == 'D') { |
| state = STATE_JISX0212MS; |
| s += 4; count += 4; |
| if (n < count+1) |
| goto none; |
| continue; |
| } |
| } |
| goto ilseq; |
| } |
| goto ilseq; |
| } |
| if (c == SO) { |
| if (state == STATE_JISX0201ROMAN) |
| state = STATE_JISX0201KATAKANA; |
| s += 1; count += 1; |
| if (n < count+1) |
| goto none; |
| continue; |
| } |
| if (c == SI) { |
| if (state == STATE_JISX0201KATAKANA) |
| state = STATE_JISX0201ROMAN; |
| s += 1; count += 1; |
| if (n < count+1) |
| goto none; |
| continue; |
| } |
| break; |
| } |
| switch (state) { |
| case STATE_ASCII: |
| if (c < 0x80) { |
| int ret = ascii_mbtowc(conv,pwc,s,1); |
| if (ret == RET_ILSEQ) |
| goto ilseq; |
| if (ret != 1) abort(); |
| conv->istate = state; |
| return count+1; |
| } else |
| goto ilseq; |
| case STATE_JISX0201ROMAN: |
| if (c < 0x80) { |
| int ret = jisx0201_mbtowc(conv,pwc,s,1); |
| if (ret == RET_ILSEQ) |
| goto ilseq; |
| if (ret != 1) abort(); |
| conv->istate = state; |
| return count+1; |
| } else |
| goto ilseq; |
| case STATE_JISX0201KATAKANA: |
| if (c < 0x80) { |
| unsigned char buf = c+0x80; |
| int ret = jisx0201_mbtowc(conv,pwc,&buf,1); |
| if (ret == RET_ILSEQ) |
| goto ilseq; |
| if (ret != 1) abort(); |
| conv->istate = state; |
| return count+1; |
| } else |
| goto ilseq; |
| case STATE_JISX0208MS: |
| if (n < count+2) |
| goto none; |
| if (s[0] < 0x80 && s[1] < 0x80) { |
| int ret; |
| if (s[0] < 0x75) { |
| if (s[0] == 0x2d) { |
| /* Extension of JIS X 0208. */ |
| if (s[1] >= 0x21 && s[1] <= 0x79) { |
| unsigned char i = (s[1] - 0x21) + 1; |
| ret = cp50221_0208_ext_mbtowc(conv,pwc,&i,1); |
| if (ret == 1) |
| ret = 2; |
| } else |
| ret = RET_ILSEQ; |
| } else { |
| /* JIS X 0208. */ |
| ret = jisx0208_mbtowc(conv,pwc,s,2); |
| } |
| } else { |
| /* Extension of JIS X 0208. |
| 0x{75..7E}{21..8E} maps to U+E000..U+E3AB. |
| But some rows maps to characters present in CP932. */ |
| if (s[0] <= 0x7e && (s[1] >= 0x21 && s[1] <= 0x7e)) { |
| unsigned short wc = 0xfffd; |
| if (s[0] >= 0x79 && s[0] <= 0x7c) |
| wc = cp932ext_2uni_pageed[(s[0] - 0x79) * 94 + (s[1] - 0x21)]; |
| if (wc == 0xfffd) |
| wc = (s[0] - 0x75) * 94 + (s[1] - 0x21) + 0xe000; |
| *pwc = wc; |
| ret = 2; |
| } else |
| ret = RET_ILSEQ; |
| } |
| if (ret == RET_ILSEQ) |
| goto ilseq; |
| if (ret != 2) abort(); |
| conv->istate = state; |
| return count+2; |
| } else |
| goto ilseq; |
| case STATE_JISX0212MS: |
| if (n < count+2) |
| goto none; |
| if (s[0] < 0x80 && s[1] < 0x80) { |
| int ret; |
| if (s[0] < 0x73) { |
| /* JIS X 0212. */ |
| ret = jisx0212_mbtowc(conv,pwc,s,2); |
| } else { |
| if (s[0] < 0x75) { |
| /* Extension of JIS X 0212. */ |
| if (s[1] >= 0x21 && s[1] <= 0x7e) { |
| unsigned char i = (s[0] - 0x73) * 94 + (s[1] - 0x21) + 1; |
| ret = cp50221_0212_ext_mbtowc(conv,pwc,&i,1); |
| if (ret == 1) |
| ret = 2; |
| } else |
| ret = RET_ILSEQ; |
| } else { |
| /* Extension of JIS X 0208. |
| 0x{75..7E}{21..8E} maps to U+E3AC..U+E757. */ |
| if (s[0] <= 0x7e && (s[1] >= 0x21 && s[1] <= 0x7e)) { |
| *pwc = (s[0] - 0x75) * 94 + (s[1] - 0x21) + 0xe3ac; |
| ret = 2; |
| } else |
| ret = RET_ILSEQ; |
| } |
| } |
| if (ret == RET_ILSEQ) |
| goto ilseq; |
| if (ret != 2) abort(); |
| conv->istate = state; |
| return count+2; |
| } else |
| goto ilseq; |
| default: abort(); |
| } |
| |
| none: |
| conv->istate = state; |
| return RET_TOOFEW(count); |
| |
| ilseq: |
| conv->istate = state; |
| return RET_SHIFT_ILSEQ(count); |
| } |
| |
| static int |
| iso2022_jpms_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n) |
| { |
| state_t state = conv->ostate; |
| unsigned char buf[2]; |
| int ret; |
| |
| /* Try ASCII. */ |
| ret = ascii_wctomb(conv,buf,wc,1); |
| if (ret != RET_ILUNI) { |
| if (ret != 1) abort(); |
| if (buf[0] < 0x80) { |
| int count = (state == STATE_ASCII ? 1 : 4); |
| if (n < count) |
| return RET_TOOSMALL; |
| if (state != STATE_ASCII) { |
| r[0] = ESC; |
| r[1] = '('; |
| r[2] = 'B'; |
| r += 3; |
| state = STATE_ASCII; |
| } |
| r[0] = buf[0]; |
| conv->ostate = state; |
| return count; |
| } |
| } |
| |
| /* Try JIS X 0201-1976 Katakana. */ |
| ret = jisx0201_wctomb(conv,buf,wc,1); |
| if (ret != RET_ILUNI) { |
| if (ret != 1) abort(); |
| if (buf[0] >= 0x80) { |
| int count = (state == STATE_JISX0201KATAKANA ? 1 : 4); |
| if (n < count) |
| return RET_TOOSMALL; |
| if (state != STATE_JISX0201KATAKANA) { |
| r[0] = ESC; |
| r[1] = '('; |
| r[2] = 'I'; |
| r += 3; |
| state = STATE_JISX0201KATAKANA; |
| } |
| r[0] = buf[0]-0x80; |
| conv->ostate = state; |
| return count; |
| } |
| } |
| |
| /* Try JIS X 0208-1990, in place of JIS X 0208-1978 and JIS X 0208-1983, |
| and the extensions mentioned above. */ |
| if (wc >= 0xe000 && wc < 0xe3ac) { |
| unsigned short i = wc - 0xe000; |
| buf[0] = (i / 94) + 0x75; |
| buf[1] = (i % 94) + 0x21; |
| ret = 2; |
| } else { |
| ret = jisx0208_wctomb(conv,buf,wc,2); |
| if (ret == RET_ILUNI) { |
| /* Extension of JIS X 0208. */ |
| unsigned char i; |
| ret = cp50221_0208_ext_wctomb(conv,&i,wc,1); |
| if (ret == 1) { |
| buf[0] = 0x2d; |
| buf[1] = i-1 + 0x21; |
| ret = 2; |
| } else if (wc == 0x663B) { |
| buf[0] = 0x7a; |
| buf[1] = 0x36; |
| ret = 2; |
| } else if (wc == 0xffe2) { |
| buf[0] = 0x7c; |
| buf[1] = 0x7b; |
| ret = 2; |
| } else if (wc == 0xffe4) { |
| buf[0] = 0x7c; |
| buf[1] = 0x7c; |
| ret = 2; |
| } |
| } |
| } |
| if (ret != RET_ILUNI) { |
| if (ret != 2) abort(); |
| if (buf[0] < 0x80 && buf[1] < 0x80) { |
| int count = (state == STATE_JISX0208MS ? 2 : 5); |
| if (n < count) |
| return RET_TOOSMALL; |
| if (state != STATE_JISX0208MS) { |
| r[0] = ESC; |
| r[1] = '$'; |
| r[2] = 'B'; |
| r += 3; |
| state = STATE_JISX0208MS; |
| } |
| r[0] = buf[0]; |
| r[1] = buf[1]; |
| conv->ostate = state; |
| return count; |
| } |
| } |
| |
| /* Try JIS X 0212-1990 and the extensions mentioned above. */ |
| if (wc >= 0xe3ac && wc < 0xe758) { |
| unsigned short i = wc - 0xe3ac; |
| buf[0] = (i / 94) + 0x75; |
| buf[1] = (i % 94) + 0x21; |
| ret = 2; |
| } else { |
| ret = jisx0212_wctomb(conv,buf,wc,2); |
| if (ret == RET_ILUNI) { |
| /* Extension of JIS X 0212. */ |
| unsigned char i; |
| ret = cp50221_0212_ext_wctomb(conv,&i,wc,1); |
| if (ret == 1) { |
| i -= 1; |
| buf[0] = (i / 94) + 0x73; |
| buf[1] = (i % 94) + 0x21; |
| ret = 2; |
| } |
| } |
| } |
| if (ret != RET_ILUNI) { |
| if (ret != 2) abort(); |
| if (buf[0] < 0x80 && buf[1] < 0x80) { |
| int count = (state == STATE_JISX0212MS ? 2 : 6); |
| if (n < count) |
| return RET_TOOSMALL; |
| if (state != STATE_JISX0212MS) { |
| r[0] = ESC; |
| r[1] = '$'; |
| r[2] = '('; |
| r[3] = 'D'; |
| r += 4; |
| state = STATE_JISX0212MS; |
| } |
| r[0] = buf[0]; |
| r[1] = buf[1]; |
| conv->ostate = state; |
| return count; |
| } |
| } |
| |
| return RET_ILUNI; |
| } |
| |
| static int |
| iso2022_jpms_reset (conv_t conv, unsigned char *r, size_t n) |
| { |
| state_t state = conv->ostate; |
| if (state != STATE_ASCII) { |
| if (n < 3) |
| return RET_TOOSMALL; |
| r[0] = ESC; |
| r[1] = '('; |
| r[2] = 'B'; |
| /* conv->ostate = 0; will be done by the caller */ |
| return 3; |
| } else |
| return 0; |
| } |
| |
| #undef STATE_JISX0212MS |
| #undef STATE_JISX0208MS |
| #undef STATE_JISX0201KATAKANA |
| #undef STATE_JISX0201ROMAN |
| #undef STATE_ASCII |
