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 * CP936 extensions
23 */
24
25static const unsigned short cp936ext_2uni_pagea6[181-159] = {
26  /* 0xa6 */
27                                                          0xfe35,
28  0xfe36, 0xfe39, 0xfe3a, 0xfe3f, 0xfe40, 0xfe3d, 0xfe3e, 0xfe41,
29  0xfe42, 0xfe43, 0xfe44, 0xfffd, 0xfffd, 0xfe3b, 0xfe3c, 0xfe37,
30  0xfe38, 0xfe31, 0xfffd, 0xfe33, 0xfe34,
31};
32static const unsigned short cp936ext_2uni_pagea8[128-122] = {
33  /* 0xa8 */
34                  0x0251, 0xfffd, 0x0144, 0x0148, 0xfffd, 0x0261,
35};
36
37static int
38cp936ext_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
39{
40  unsigned char c1 = s[0];
41  if ((c1 == 0xa6) || (c1 == 0xa8)) {
42    if (n >= 2) {
43      unsigned char c2 = s[1];
44      if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0x80 && c2 < 0xff)) {
45        unsigned int i = 190 * (c1 - 0x81) + (c2 - (c2 >= 0x80 ? 0x41 : 0x40));
46        unsigned short wc = 0xfffd;
47        if (i < 7410) {
48          if (i >= 7189 && i < 7211)
49            wc = cp936ext_2uni_pagea6[i-7189];
50        } else {
51          if (i >= 7532 && i < 7538)
52            wc = cp936ext_2uni_pagea8[i-7532];
53        }
54        if (wc != 0xfffd) {
55          *pwc = (ucs4_t) wc;
56          return 2;
57        }
58      }
59      return RET_ILSEQ;
60    }
61    return RET_TOOFEW(0);
62  }
63  return RET_ILSEQ;
64}
65
66static const unsigned short cp936ext_page01[16] = {
67  0x0000, 0x0000, 0x0000, 0x0000, 0xa8bd, 0x0000, 0x0000, 0x0000, /*0x40-0x47*/
68  0xa8be, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /*0x48-0x4f*/
69};
70static const unsigned short cp936ext_page02[24] = {
71  0x0000, 0xa8bb, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /*0x50-0x57*/
72  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /*0x58-0x5f*/
73  0x0000, 0xa8c0, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /*0x60-0x67*/
74};
75static const unsigned short cp936ext_pagefe[24] = {
76  0x0000, 0xa6f2, 0x0000, 0xa6f4, 0xa6f5, 0xa6e0, 0xa6e1, 0xa6f0, /*0x30-0x37*/
77  0xa6f1, 0xa6e2, 0xa6e3, 0xa6ee, 0xa6ef, 0xa6e6, 0xa6e7, 0xa6e4, /*0x38-0x3f*/
78  0xa6e5, 0xa6e8, 0xa6e9, 0xa6ea, 0xa6eb, 0x0000, 0x0000, 0x0000, /*0x40-0x47*/
79};
80
81static int
82cp936ext_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
83{
84  if (n >= 2) {
85    unsigned short c = 0;
86    if (wc >= 0x0140 && wc < 0x0150)
87      c = cp936ext_page01[wc-0x0140];
88    else if (wc >= 0x0250 && wc < 0x0268)
89      c = cp936ext_page02[wc-0x0250];
90    else if (wc >= 0xfe30 && wc < 0xfe48)
91      c = cp936ext_pagefe[wc-0xfe30];
92    if (c != 0) {
93      r[0] = (c >> 8); r[1] = (c & 0xff);
94      return 2;
95    }
96    return RET_ILUNI;
97  }
98  return RET_TOOSMALL;
99}
100