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 * CP949 is EUC-KR, extended with UHC (Unified Hangul Code).
23 *
24 * Some variants of CP949 (in JDK, Windows-2000, ICU) also add:
25 *
26 * 2. Private area mappings:
27 *
28 *        code           Unicode
29 *    0xC9{A1..FE}   U+E000..U+E05D
30 *    0xFE{A1..FE}   U+E05E..U+E0BB
31 *
32 * We add them too because, although there are backward compatibility problems
33 * when a character from a private area is moved to an official Unicode code
34 * point, they are useful for some people in practice.
35 */
36
37#include "uhc_1.h"
38#include "uhc_2.h"
39
40static int
41cp949_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
42{
43  unsigned char c = *s;
44  /* Code set 0 (ASCII) */
45  if (c < 0x80)
46    return ascii_mbtowc(conv,pwc,s,n);
47  /* UHC part 1 */
48  if (c >= 0x81 && c <= 0xa0)
49    return uhc_1_mbtowc(conv,pwc,s,n);
50  if (c >= 0xa1 && c < 0xff) {
51    if (n < 2)
52      return RET_TOOFEW(0);
53    {
54      unsigned char c2 = s[1];
55      if (c2 < 0xa1)
56        /* UHC part 2 */
57        return uhc_2_mbtowc(conv,pwc,s,n);
58      else if (c2 < 0xff) {
59        /* Code set 1 (KS C 5601-1992) */
60        unsigned char buf[2];
61        int ret;
62        buf[0] = c-0x80; buf[1] = c2-0x80;
63        ret = ksc5601_mbtowc(conv,pwc,buf,2);
64        if (ret != RET_ILSEQ)
65          return ret;
66        /* User-defined characters */
67        if (c == 0xc9) {
68          *pwc = 0xe000 + (c2 - 0xa1);
69          return 2;
70        }
71        if (c == 0xfe) {
72          *pwc = 0xe05e + (c2 - 0xa1);
73          return 2;
74        }
75      }
76    }
77  }
78  return RET_ILSEQ;
79}
80
81static int
82cp949_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
83{
84  unsigned char buf[2];
85  int ret;
86
87  /* Code set 0 (ASCII) */
88  ret = ascii_wctomb(conv,r,wc,n);
89  if (ret != RET_ILUNI)
90    return ret;
91
92  /* Code set 1 (KS C 5601-1992) */
93  ret = ksc5601_wctomb(conv,buf,wc,2);
94  if (ret != RET_ILUNI) {
95    if (ret != 2) abort();
96    if (n < 2)
97      return RET_TOOSMALL;
98    r[0] = buf[0]+0x80;
99    r[1] = buf[1]+0x80;
100    return 2;
101  }
102
103  /* UHC */
104  if (wc >= 0xac00 && wc < 0xd7a4) {
105    if (wc < 0xc8a5)
106      return uhc_1_wctomb(conv,r,wc,n);
107    else
108      return uhc_2_wctomb(conv,r,wc,n);
109  }
110
111  /* User-defined characters */
112  if (wc >= 0xe000 && wc < 0xe0bc) {
113    if (n < 2)
114      return RET_TOOSMALL;
115    if (wc < 0xe05e) {
116      r[0] = 0xc9;
117      r[1] = wc - 0xe000 + 0xa1;
118    } else {
119      r[0] = 0xfe;
120      r[1] = wc - 0xe05e + 0xa1;
121    }
122    return 2;
123  }
124
125  return RET_ILUNI;
126}
127