1/*
2 * Copyright (C) 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 * DEC-HANYU
23 */
24
25static int
26dec_hanyu_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
27{
28  unsigned char c = *s;
29  /* Code set 0 (ASCII) */
30  if (c < 0x80)
31    return ascii_mbtowc(conv,pwc,s,n);
32  /* Code set 1 (CNS 11643-1992 Plane 1),
33     Code set 2 (CNS 11643-1992 Plane 2),
34     Code set 3 (CNS 11643-1992 Plane 3) */
35  if (c >= 0xa1 && c < 0xff) {
36    if (n < 2)
37      return RET_TOOFEW(0);
38    {
39      unsigned char c2 = s[1];
40      if (c == 0xc2 && c2 == 0xcb) {
41        if (n < 4)
42          return RET_TOOFEW(0);
43        if (s[2] >= 0xa1 && s[2] < 0xff && s[3] >= 0xa1 && s[3] < 0xff) {
44          unsigned char buf[2];
45          int ret;
46          buf[0] = s[2]-0x80; buf[1] = s[3]-0x80;
47          ret = cns11643_3_mbtowc(conv,pwc,buf,2);
48          if (ret != RET_ILSEQ) {
49            if (ret != 2) abort();
50            return 4;
51          }
52        }
53      } else if (c2 >= 0xa1 && c2 < 0xff) {
54        if (c != 0xc2 || c2 < 0xc2) {
55          unsigned char buf[2];
56          buf[0] = c-0x80; buf[1] = c2-0x80;
57          return cns11643_1_mbtowc(conv,pwc,buf,2);
58        }
59      } else if (c2 >= 0x21 && c2 < 0x7f) {
60        unsigned char buf[2];
61        buf[0] = c-0x80; buf[1] = c2;
62        return cns11643_2_mbtowc(conv,pwc,buf,2);
63      }
64    }
65  }
66  return RET_ILSEQ;
67}
68
69static int
70dec_hanyu_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
71{
72  unsigned char buf[3];
73  int ret;
74
75  /* Code set 0 (ASCII) */
76  ret = ascii_wctomb(conv,r,wc,n);
77  if (ret != RET_ILUNI)
78    return ret;
79
80  ret = cns11643_wctomb(conv,buf,wc,3);
81  if (ret != RET_ILUNI) {
82    if (ret != 3) abort();
83
84    /* Code set 1 (CNS 11643-1992 Plane 1) */
85    if (buf[0] == 1 && (buf[1] != 0x42 || buf[2] < 0x42)) {
86      if (n < 2)
87        return RET_TOOSMALL;
88      r[0] = buf[1]+0x80;
89      r[1] = buf[2]+0x80;
90      return 2;
91    }
92
93    /* Code set 2 (CNS 11643-1992 Plane 2) */
94    if (buf[0] == 2) {
95      if (n < 2)
96        return RET_TOOSMALL;
97      r[0] = buf[1]+0x80;
98      r[1] = buf[2];
99      return 2;
100    }
101
102    /* Code set 3 (CNS 11643-1992 Plane 3) */
103    if (buf[0] == 3) {
104      if (n < 4)
105        return RET_TOOSMALL;
106      r[0] = 0xc2;
107      r[1] = 0xcb;
108      r[2] = buf[1]+0x80;
109      r[3] = buf[2]+0x80;
110      return 4;
111    }
112  }
113
114  return RET_ILUNI;
115}
116