Edit
kc3-lang/libiconv/lib/iso2022_jpms.h
Bruno Haible
- lib/iso2022_jpms.h
-
/* * 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