1/*
2 * Copyright (C) 1999-2001 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 * CP950 extensions
23 */
24
25static const unsigned short cp950ext_2uni_pagef9[157-116] = {
26  /* 0xf9 */
27                                  0x7881, 0x92b9, 0x88cf, 0x58bb,
28  0x6052, 0x7ca7, 0x5afa, 0x2554, 0x2566, 0x2557, 0x2560, 0x256c,
29  0x2563, 0x255a, 0x2569, 0x255d, 0x2552, 0x2564, 0x2555, 0x255e,
30  0x256a, 0x2561, 0x2558, 0x2567, 0x255b, 0x2553, 0x2565, 0x2556,
31  0x255f, 0x256b, 0x2562, 0x2559, 0x2568, 0x255c, 0x2551, 0x2550,
32  0x256d, 0x256e, 0x2570, 0x256f, 0x2593,
33};
34
35static int
36cp950ext_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
37{
38  unsigned char c1 = s[0];
39  if ((c1 == 0xf9)) {
40    if (n >= 2) {
41      unsigned char c2 = s[1];
42      if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff)) {
43        unsigned int i = 157 * (c1 - 0xa1) + (c2 - (c2 >= 0xa1 ? 0x62 : 0x40));
44        unsigned short wc = 0xfffd;
45        {
46          if (i >= 13932 && i < 13973)
47            wc = cp950ext_2uni_pagef9[i-13932];
48        }
49        if (wc != 0xfffd) {
50          *pwc = (ucs4_t) wc;
51          return 2;
52        }
53      }
54      return RET_ILSEQ;
55    }
56    return RET_TOOFEW(0);
57  }
58  return RET_ILSEQ;
59}
60
61static const unsigned short cp950ext_2charset[41] = {
62  0xf9f9, 0xf9f8, 0xf9e6, 0xf9ef, 0xf9dd, 0xf9e8, 0xf9f1, 0xf9df,
63  0xf9ec, 0xf9f5, 0xf9e3, 0xf9ee, 0xf9f7, 0xf9e5, 0xf9e9, 0xf9f2,
64  0xf9e0, 0xf9eb, 0xf9f4, 0xf9e2, 0xf9e7, 0xf9f0, 0xf9de, 0xf9ed,
65  0xf9f6, 0xf9e4, 0xf9ea, 0xf9f3, 0xf9e1, 0xf9fa, 0xf9fb, 0xf9fd,
66  0xf9fc, 0xf9fe, 0xf9d9, 0xf9dc, 0xf9da, 0xf9d6, 0xf9db, 0xf9d8,
67  0xf9d7,
68};
69
70static const Summary16 cp950ext_uni2indx_page25[10] = {
71  /* 0x2500 */
72  {    0, 0x0000 }, {    0, 0x0000 }, {    0, 0x0000 }, {    0, 0x0000 },
73  {    0, 0x0000 }, {    0, 0xffff }, {   16, 0xffff }, {   32, 0x0001 },
74  {   33, 0x0000 }, {   33, 0x0008 },
75};
76static const Summary16 cp950ext_uni2indx_page58[12] = {
77  /* 0x5800 */
78  {   34, 0x0000 }, {   34, 0x0000 }, {   34, 0x0000 }, {   34, 0x0000 },
79  {   34, 0x0000 }, {   34, 0x0000 }, {   34, 0x0000 }, {   34, 0x0000 },
80  {   34, 0x0000 }, {   34, 0x0000 }, {   34, 0x0000 }, {   34, 0x0800 },
81};
82static const Summary16 cp950ext_uni2indx_page5a[16] = {
83  /* 0x5a00 */
84  {   35, 0x0000 }, {   35, 0x0000 }, {   35, 0x0000 }, {   35, 0x0000 },
85  {   35, 0x0000 }, {   35, 0x0000 }, {   35, 0x0000 }, {   35, 0x0000 },
86  {   35, 0x0000 }, {   35, 0x0000 }, {   35, 0x0000 }, {   35, 0x0000 },
87  {   35, 0x0000 }, {   35, 0x0000 }, {   35, 0x0000 }, {   35, 0x0400 },
88};
89static const Summary16 cp950ext_uni2indx_page60[6] = {
90  /* 0x6000 */
91  {   36, 0x0000 }, {   36, 0x0000 }, {   36, 0x0000 }, {   36, 0x0000 },
92  {   36, 0x0000 }, {   36, 0x0004 },
93};
94static const Summary16 cp950ext_uni2indx_page78[9] = {
95  /* 0x7800 */
96  {   37, 0x0000 }, {   37, 0x0000 }, {   37, 0x0000 }, {   37, 0x0000 },
97  {   37, 0x0000 }, {   37, 0x0000 }, {   37, 0x0000 }, {   37, 0x0000 },
98  {   37, 0x0002 },
99};
100static const Summary16 cp950ext_uni2indx_page7c[11] = {
101  /* 0x7c00 */
102  {   38, 0x0000 }, {   38, 0x0000 }, {   38, 0x0000 }, {   38, 0x0000 },
103  {   38, 0x0000 }, {   38, 0x0000 }, {   38, 0x0000 }, {   38, 0x0000 },
104  {   38, 0x0000 }, {   38, 0x0000 }, {   38, 0x0080 },
105};
106static const Summary16 cp950ext_uni2indx_page88[13] = {
107  /* 0x8800 */
108  {   39, 0x0000 }, {   39, 0x0000 }, {   39, 0x0000 }, {   39, 0x0000 },
109  {   39, 0x0000 }, {   39, 0x0000 }, {   39, 0x0000 }, {   39, 0x0000 },
110  {   39, 0x0000 }, {   39, 0x0000 }, {   39, 0x0000 }, {   39, 0x0000 },
111  {   39, 0x8000 },
112};
113static const Summary16 cp950ext_uni2indx_page92[12] = {
114  /* 0x9200 */
115  {   40, 0x0000 }, {   40, 0x0000 }, {   40, 0x0000 }, {   40, 0x0000 },
116  {   40, 0x0000 }, {   40, 0x0000 }, {   40, 0x0000 }, {   40, 0x0000 },
117  {   40, 0x0000 }, {   40, 0x0000 }, {   40, 0x0000 }, {   40, 0x0200 },
118};
119
120static int
121cp950ext_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
122{
123  if (n >= 2) {
124    const Summary16 *summary = NULL;
125    if (wc >= 0x2500 && wc < 0x25a0)
126      summary = &cp950ext_uni2indx_page25[(wc>>4)-0x250];
127    else if (wc >= 0x5800 && wc < 0x58c0)
128      summary = &cp950ext_uni2indx_page58[(wc>>4)-0x580];
129    else if (wc >= 0x5a00 && wc < 0x5b00)
130      summary = &cp950ext_uni2indx_page5a[(wc>>4)-0x5a0];
131    else if (wc >= 0x6000 && wc < 0x6060)
132      summary = &cp950ext_uni2indx_page60[(wc>>4)-0x600];
133    else if (wc >= 0x7800 && wc < 0x7890)
134      summary = &cp950ext_uni2indx_page78[(wc>>4)-0x780];
135    else if (wc >= 0x7c00 && wc < 0x7cb0)
136      summary = &cp950ext_uni2indx_page7c[(wc>>4)-0x7c0];
137    else if (wc >= 0x8800 && wc < 0x88d0)
138      summary = &cp950ext_uni2indx_page88[(wc>>4)-0x880];
139    else if (wc >= 0x9200 && wc < 0x92c0)
140      summary = &cp950ext_uni2indx_page92[(wc>>4)-0x920];
141    if (summary) {
142      unsigned short used = summary->used;
143      unsigned int i = wc & 0x0f;
144      if (used & ((unsigned short) 1 << i)) {
145        unsigned short c;
146        /* Keep in `used' only the bits 0..i-1. */
147        used &= ((unsigned short) 1 << i) - 1;
148        /* Add `summary->indx' and the number of bits set in `used'. */
149        used = (used & 0x5555) + ((used & 0xaaaa) >> 1);
150        used = (used & 0x3333) + ((used & 0xcccc) >> 2);
151        used = (used & 0x0f0f) + ((used & 0xf0f0) >> 4);
152        used = (used & 0x00ff) + (used >> 8);
153        c = cp950ext_2charset[summary->indx + used];
154        r[0] = (c >> 8); r[1] = (c & 0xff);
155        return 2;
156      }
157    }
158    return RET_ILUNI;
159  }
160  return RET_TOOSMALL;
161}
162