lib/isoir165.h

   1 /*
   2  * Copyright (C) 1999-2000 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., 59 Temple Place -
  18  * Suite 330, Boston, MA 02111-1307, 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
  83 static int
  84 isoir165_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int 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
 124 static int
 125 isoir165_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
 126 {
 127   unsigned char buf[1];
 128   int ret;
 129
 130   /* Try the Unicode -> GB2312 table table. */
 131   ret = gb2312_wctomb(conv,r,wc,n);
 132   if (ret != RET_ILSEQ) {
 133     if (ret != 2) abort();
 134     if (!(r[0] == 0x28 && r[1] >= 0x21 && r[1] <= 0x40))
 135       return ret;
 136   }
 137   /* Row 0x2A is GB_1988-80. */
 138   ret = iso646_cn_wctomb(conv,buf,wc,1);
 139   if (ret != RET_ILSEQ) {
 140     if (ret != 1) abort();
 141     if (buf[0] >= 0x21 && buf[0] < 0x7f) {
 142       if (n >= 2) {
 143         r[0] = 0x2a;
 144         r[1] = buf[0];
 145         return 2;
 146       }
 147       return RET_TOOSMALL;
 148     }
 149   }
 150   /* Try the Unicode -> ISO-IR-165 extensions table. */
 151   ret = isoir165ext_wctomb(conv,r,wc,n);
 152   return ret;
 153 }