1: /*
2: * Copyright (C) 1999-2001, 2005, 2012, 2016 Free Software Foundation, Inc.
3: * This file is part of the GNU LIBICONV Library.
4: *
5: * The GNU LIBICONV Library is free software; you can redistribute it
6: * and/or modify it under the terms of the GNU Library General Public
7: * License as published by the Free Software Foundation; either version 2
8: * of the License, or (at your option) any later version.
9: *
10: * The GNU LIBICONV Library is distributed in the hope that it will be
11: * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
12: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13: * Library General Public License for more details.
14: *
15: * You should have received a copy of the GNU Library General Public
16: * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
17: * If not, see <https://www.gnu.org/licenses/>.
18: */
19:
20: /*
21: * ISO-IR-165
22: */
23:
24: /*
25: * ISO-IR-165 is an extension of GB 2312, consisting of:
26: * 1. GB 6345.1-86 corrections:
27: * Two corrections to GB 2312, at 0x2367 and 0x6F71.
28: * 2. GB 6345.1-86 additions:
29: * - 6 new full-width pinyin characters in row 0x28.
30: * - ISO646-CN in row 0x2A.
31: * - 32 half-width pinyin characters in row 0x2B.
32: * 3. GB 8565.2-88 additions:
33: * - 50 characters in row 0x2D.
34: * - 92 characters in row 0x2E.
35: * - 93 characters in row 0x2F.
36: * - 470 characters in rows 0x7A-0x7E.
37: * 4. ISO-IR-165 additions:
38: * - 22 characters in row 0x26.
39: * - 94 characters in row 0x2C.
40: * - 44 new characters in row 0x2D.
41: * - 1 new character in row 0x2F.
42: *
43: * The conversion table was created from the following sources:
44: * Ad 1. The 0x2367 correction is already integrated in the unicode.org
45: * GB2312.TXT table. The 0x6F71 mapping is the same in the unicode.org
46: * GB2312.TXT and UNIHAN.TXT table and in Koichi Yasuoka's Uni2GB table,
47: * so we assume it's correct.
48: * The unicode.org UNIHAN.TXT table about GB 8565 is not usable: it has
49: * extraneous code points at rows 0x28, 0x2C, 0x2D. Note also that it does
50: * not list the 69 non-hanzi in row 0x2F. Moreover, it has the characters
51: * 0x2F7A-0x2F7D shifted down by one to 0x2F79-0x2F7C.
52: * Therefore we take the GB8565 and ISO-IR-165 data from Koichi Yasuoka's
53: * Uni2GB table.
54: * Ad 1. Yasuoka maps 0x2367 to U+0261 (small script g) and 0x2840 to U+FF47
55: * (full-width small normal g). While coherent with ISO-IR's 165.pdf,
56: * this disagrees with Ken Lunde's book: He says that ISO-IR-165
57: * includes the GB6345 correction, i.e. maps 0x2367 to U+FF47 or U+0067
58: * and _not_ to U+0261 (small script g).
59: * To overcome the confusion, we just map both 0x2367 and 0x2840 to
60: * U+FF47.
61: * Ad 2. Row 0x28: Add a mapping from 0x283F to U+01F9.
62: * Row 0x2A: Mapping is well-known, also present in Koichi Yasuoka's
63: * table.
64: * Row 0x2B: Typed in by hand from appendix E in Ken Lunde's book.
65: * When converting from Unicode to ISO-IR-165, prefer the half-width
66: * range 0x2B{21..40} to the full-width range 0x28{21..40}.
67: * Ad 3. Rows 0x2D, 0x2E: Both Koichi Yasuoka's Uni2GB table and the UNIHAN.TXT
68: * data for GB 8565 agree here.
69: * Row 0x2F: Taken from Koichi Yasuoka's Uni2GB table.
70: * Rows 0x7A-0x7E: Koichi Yasuoka's Uni2GB table and the UNIHAN.TXT
71: * data for GB 8565 agree here mostly. Differences:
72: * 0x7C38 -> U+6F26 or U+527A ? We choose U+6F26.
73: * 0x7C5A -> U+7A40 or U+6996 ? We choose U+6996.
74: * Ad 4. Row 0x26: Mapping unknown.
75: * Rows 0x2C, 0x2D: Both Koichi Yasuoka's Uni2GB table and the UNIHAN.TXT
76: * data for GB 8565 (!) agree here.
77: * Row 0x2F: Taken from Koichi Yasuoka's Uni2GB table.
78: */
79:
80: #include "isoir165ext.h"
81:
82: static int
83: isoir165_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
84: {
85: int ret;
86:
87: /* Map full-width pinyin (row 0x28) like half-width pinyin (row 0x2B). */
88: if (s[0] == 0x28) {
89: if (n >= 2) {
90: unsigned char c2 = s[1];
91: if (c2 >= 0x21 && c2 <= 0x40) {
92: unsigned char buf[2];
93: buf[0] = 0x2b;
94: buf[1] = c2;
95: ret = isoir165ext_mbtowc(conv,pwc,buf,2);
96: if (ret != RET_ILSEQ)
97: return ret;
98: }
99: }
100: }
101: /* Try the GB2312 -> Unicode table. */
102: ret = gb2312_mbtowc(conv,pwc,s,n);
103: if (ret != RET_ILSEQ)
104: return ret;
105: /* Row 0x2A is GB_1988-80. */
106: if (s[0] == 0x2a) {
107: if (n >= 2) {
108: unsigned char c2 = s[1];
109: if (c2 >= 0x21 && c2 < 0x7f) {
110: ret = iso646_cn_mbtowc(conv,pwc,s+1,1);
111: if (ret != 1) abort();
112: return 2;
113: }
114: return RET_ILSEQ;
115: }
116: return RET_TOOFEW(0);
117: }
118: /* Try the ISO-IR-165 extensions -> Unicode table. */
119: ret = isoir165ext_mbtowc(conv,pwc,s,n);
120: return ret;
121: }
122:
123: static int
124: isoir165_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
125: {
126: unsigned char buf[2];
127: int ret;
128:
129: /* Try the Unicode -> GB2312 table. */
130: ret = gb2312_wctomb(conv,buf,wc,2);
131: if (ret != RET_ILUNI) {
132: if (ret != 2) abort();
133: if (!(buf[0] == 0x28 && buf[1] >= 0x21 && buf[1] <= 0x40)) {
134: if (n >= 2) {
135: r[0] = buf[0];
136: r[1] = buf[1];
137: return 2;
138: }
139: return RET_TOOSMALL;
140: }
141: }
142: /* Row 0x2A is GB_1988-80. */
143: ret = iso646_cn_wctomb(conv,buf,wc,1);
144: if (ret != RET_ILUNI) {
145: if (ret != 1) abort();
146: if (buf[0] >= 0x21 && buf[0] < 0x7f) {
147: if (n >= 2) {
148: r[0] = 0x2a;
149: r[1] = buf[0];
150: return 2;
151: }
152: return RET_TOOSMALL;
153: }
154: }
155: /* Try the Unicode -> ISO-IR-165 extensions table. */
156: ret = isoir165ext_wctomb(conv,r,wc,n);
157: return ret;
158: }
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