1/*
2 * Copyright (C) 1999-2001, 2005 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, write to the Free Software Foundation, Inc., 51 Franklin Street,
18 * Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20
21/*
22 * ISO-IR-165
23 */
24
25/*
26 * ISO-IR-165 is an extension of GB 2312, consisting of:
27 * 1. GB 6345.1-86 corrections:
28 *    Two corrections to GB 2312, at 0x2367 and 0x6F71.
29 * 2. GB 6345.1-86 additions:
30 *    - 6 new full-width pinyin characters in row 0x28.
31 *    - ISO646-CN in row 0x2A.
32 *    - 32 half-width pinyin characters in row 0x2B.
33 * 3. GB 8565.2-88 additions:
34 *    - 50 characters in row 0x2D.
35 *    - 92 characters in row 0x2E.
36 *    - 93 characters in row 0x2F.
37 *    - 470 characters in rows 0x7A-0x7E.
38 * 4. ISO-IR-165 additions:
39 *    - 22 characters in row 0x26.
40 *    - 94 characters in row 0x2C.
41 *    - 44 new characters in row 0x2D.
42 *    - 1 new character in row 0x2F.
43 *
44 * The conversion table was created from the following sources:
45 * Ad 1. The 0x2367 correction is already integrated in the unicode.org
46 *       GB2312.TXT table. The 0x6F71 mapping is the same in the unicode.org
47 *       GB2312.TXT and UNIHAN.TXT table and in Koichi Yasuoka's Uni2GB table,
48 *       so we assume it's correct.
49 * The unicode.org UNIHAN.TXT table about GB 8565 is not usable: it has
50 * extraneous code points at rows 0x28, 0x2C, 0x2D. Note also that it does
51 * not list the 69 non-hanzi in row 0x2F. Moreover, it has the characters
52 * 0x2F7A-0x2F7D shifted down by one to 0x2F79-0x2F7C.
53 * Therefore we take the GB8565 and ISO-IR-165 data from Koichi Yasuoka's
54 * Uni2GB table.
55 * Ad 1. Yasuoka maps 0x2367 to U+0261 (small script g) and 0x2840 to U+FF47
56 *       (full-width small normal g). While coherent with ISO-IR's 165.pdf,
57 *       this disagrees with Ken Lunde's book: He says that ISO-IR-165
58 *       includes the GB6345 correction, i.e. maps 0x2367 to U+FF47 or U+0067
59 *       and _not_ to U+0261 (small script g).
60 *       To overcome the confusion, we just map both 0x2367 and 0x2840 to
61 *       U+FF47.
62 * Ad 2. Row 0x28: Add a mapping from 0x283F to U+01F9.
63 *       Row 0x2A: Mapping is well-known, also present in Koichi Yasuoka's
64 *                 table.
65 *       Row 0x2B: Typed in by hand from appendix E in Ken Lunde's book.
66 *       When converting from Unicode to ISO-IR-165, prefer the half-width
67 *       range 0x2B{21..40} to the full-width range 0x28{21..40}.
68 * Ad 3. Rows 0x2D, 0x2E: Both Koichi Yasuoka's Uni2GB table and the UNIHAN.TXT
69 *                 data for GB 8565 agree here.
70 *       Row 0x2F: Taken from Koichi Yasuoka's Uni2GB table.
71 *       Rows 0x7A-0x7E: Koichi Yasuoka's Uni2GB table and the UNIHAN.TXT
72 *                 data for GB 8565 agree here mostly. Differences:
73 *                 0x7C38 -> U+6F26 or U+527A ? We choose U+6F26.
74 *                 0x7C5A -> U+7A40 or U+6996 ? We choose U+6996.
75 * Ad 4. Row 0x26: Mapping unknown.
76 *       Rows 0x2C, 0x2D: Both Koichi Yasuoka's Uni2GB table and the UNIHAN.TXT
77 *                 data for GB 8565 (!) agree here.
78 *       Row 0x2F: Taken from Koichi Yasuoka's Uni2GB table.
79 */
80
81#include "isoir165ext.h"
82
83static int
84isoir165_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
85{
86  int ret;
87
88  /* Map full-width pinyin (row 0x28) like half-width pinyin (row 0x2B). */
89  if (s[0] == 0x28) {
90    if (n >= 2) {
91      unsigned char c2 = s[1];
92      if (c2 >= 0x21 && c2 <= 0x40) {
93        unsigned char buf[2];
94        buf[0] = 0x2b;
95        buf[1] = c2;
96        ret = isoir165ext_mbtowc(conv,pwc,buf,2);
97        if (ret != RET_ILSEQ)
98          return ret;
99      }
100    }
101  }
102  /* Try the GB2312 -> Unicode table. */
103  ret = gb2312_mbtowc(conv,pwc,s,n);
104  if (ret != RET_ILSEQ)
105    return ret;
106  /* Row 0x2A is GB_1988-80. */
107  if (s[0] == 0x2a) {
108    if (n >= 2) {
109      unsigned char c2 = s[1];
110      if (c2 >= 0x21 && c2 < 0x7f) {
111        int ret = iso646_cn_mbtowc(conv,pwc,s+1,1);
112        if (ret != 1) abort();
113        return 2;
114      }
115      return RET_ILSEQ;
116    }
117    return RET_TOOFEW(0);
118  }
119  /* Try the ISO-IR-165 extensions -> Unicode table. */
120  ret = isoir165ext_mbtowc(conv,pwc,s,n);
121  return ret;
122}
123
124static int
125isoir165_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
126{
127  unsigned char buf[2];
128  int ret;
129
130  /* Try the Unicode -> GB2312 table. */
131  ret = gb2312_wctomb(conv,buf,wc,2);
132  if (ret != RET_ILUNI) {
133    if (ret != 2) abort();
134    if (!(buf[0] == 0x28 && buf[1] >= 0x21 && buf[1] <= 0x40)) {
135      if (n >= 2) {
136        r[0] = buf[0];
137        r[1] = buf[1];
138        return 2;
139      }
140      return RET_TOOSMALL;
141    }
142  }
143  /* Row 0x2A is GB_1988-80. */
144  ret = iso646_cn_wctomb(conv,buf,wc,1);
145  if (ret != RET_ILUNI) {
146    if (ret != 1) abort();
147    if (buf[0] >= 0x21 && buf[0] < 0x7f) {
148      if (n >= 2) {
149        r[0] = 0x2a;
150        r[1] = buf[0];
151        return 2;
152      }
153      return RET_TOOSMALL;
154    }
155  }
156  /* Try the Unicode -> ISO-IR-165 extensions table. */
157  ret = isoir165ext_wctomb(conv,r,wc,n);
158  return ret;
159}
160