1/*
2 * Copyright (C) 1999-2002, 2006, 2010 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 * BIG5-HKSCS:2008
23 */
24
25/*
26 * BIG5-HKSCS:2008 can be downloaded from
27 *   http://www.ogcio.gov.hk/ccli/eng/hkscs/download.html
28 *   http://www.ogcio.gov.hk/ccli/eng/hkscs/introduction.html
29 *
30 * It extends BIG5-HKSCS:2004 through 68 characters.
31 *
32 * It extends BIG5 (without the rows 0xC6..0xC7) through the ranges
33 *
34 *   0x{87..8D}{40..7E,A1..FE}      880 characters
35 *   0x{8E..A0}{40..7E,A1..FE}     2898 characters
36 *   0x{C6..C8}{40..7E,A1..FE}      359 characters
37 *   0xF9{D6..FE}                    41 characters
38 *   0x{FA..FE}{40..7E,A1..FE}      763 characters
39 *
40 * Note that some HKSCS characters are not contained in Unicode 3.2
41 * and are therefore best represented as sequences of Unicode characters:
42 *   0x8862  U+00CA U+0304  LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND MACRON
43 *   0x8864  U+00CA U+030C  LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND CARON
44 *   0x88A3  U+00EA U+0304  LATIN SMALL LETTER E WITH CIRCUMFLEX AND MACRON
45 *   0x88A5  U+00EA U+030C  LATIN SMALL LETTER E WITH CIRCUMFLEX AND CARON
46 */
47
48#include "hkscs2008.h"
49#include "flushwc.h"
50
51static int
52big5hkscs2008_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
53{
54  ucs4_t last_wc = conv->istate;
55  if (last_wc) {
56    /* Output the buffered character. */
57    conv->istate = 0;
58    *pwc = last_wc;
59    return 0; /* Don't advance the input pointer. */
60  } else {
61    unsigned char c = *s;
62    /* Code set 0 (ASCII) */
63    if (c < 0x80)
64      return ascii_mbtowc(conv,pwc,s,n);
65    /* Code set 1 (BIG5 extended) */
66    if (c >= 0xa1 && c < 0xff) {
67      if (n < 2)
68        return RET_TOOFEW(0);
69      {
70        unsigned char c2 = s[1];
71        if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff)) {
72          if (!((c == 0xc6 && c2 >= 0xa1) || c == 0xc7)) {
73            int ret = big5_mbtowc(conv,pwc,s,2);
74            if (ret != RET_ILSEQ)
75              return ret;
76          }
77        }
78      }
79    }
80    {
81      int ret = hkscs1999_mbtowc(conv,pwc,s,n);
82      if (ret != RET_ILSEQ)
83        return ret;
84    }
85    {
86      int ret = hkscs2001_mbtowc(conv,pwc,s,n);
87      if (ret != RET_ILSEQ)
88        return ret;
89    }
90    {
91      int ret = hkscs2004_mbtowc(conv,pwc,s,n);
92      if (ret != RET_ILSEQ)
93        return ret;
94    }
95    {
96      int ret = hkscs2008_mbtowc(conv,pwc,s,n);
97      if (ret != RET_ILSEQ)
98        return ret;
99    }
100    if (c == 0x88) {
101      if (n < 2)
102        return RET_TOOFEW(0);
103      {
104        unsigned char c2 = s[1];
105        if (c2 == 0x62 || c2 == 0x64 || c2 == 0xa3 || c2 == 0xa5) {
106          /* It's a composed character. */
107          ucs4_t wc1 = ((c2 >> 3) << 2) + 0x009a; /* = 0x00ca or 0x00ea */
108          ucs4_t wc2 = ((c2 & 6) << 2) + 0x02fc; /* = 0x0304 or 0x030c */
109          /* We cannot output two Unicode characters at once. So,
110             output the first character and buffer the second one. */
111          *pwc = wc1;
112          conv->istate = wc2;
113          return 2;
114        }
115      }
116    }
117    return RET_ILSEQ;
118  }
119}
120
121#define big5hkscs2008_flushwc normal_flushwc
122
123static int
124big5hkscs2008_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
125{
126  int count = 0;
127  unsigned char last = conv->ostate;
128
129  if (last) {
130    /* last is = 0x66 or = 0xa7. */
131    if (wc == 0x0304 || wc == 0x030c) {
132      /* Output the combined character. */
133      if (n >= 2) {
134        r[0] = 0x88;
135        r[1] = last + ((wc & 24) >> 2) - 4; /* = 0x62 or 0x64 or 0xa3 or 0xa5 */
136        conv->ostate = 0;
137        return 2;
138      } else
139        return RET_TOOSMALL;
140    }
141
142    /* Output the buffered character. */
143    if (n < 2)
144      return RET_TOOSMALL;
145    r[0] = 0x88;
146    r[1] = last;
147    r += 2;
148    count = 2;
149  }
150
151  /* Code set 0 (ASCII) */
152  if (wc < 0x0080) {
153    /* Plain ASCII character. */
154    if (n > count) {
155      r[0] = (unsigned char) wc;
156      conv->ostate = 0;
157      return count+1;
158    } else
159      return RET_TOOSMALL;
160  } else {
161    unsigned char buf[2];
162    int ret;
163
164    /* Code set 1 (BIG5 extended) */
165    ret = big5_wctomb(conv,buf,wc,2);
166    if (ret != RET_ILUNI) {
167      if (ret != 2) abort();
168      if (!((buf[0] == 0xc6 && buf[1] >= 0xa1) || buf[0] == 0xc7)) {
169        if (n >= count+2) {
170          r[0] = buf[0];
171          r[1] = buf[1];
172          conv->ostate = 0;
173          return count+2;
174        } else
175          return RET_TOOSMALL;
176      }
177    }
178    ret = hkscs1999_wctomb(conv,buf,wc,2);
179    if (ret != RET_ILUNI) {
180      if (ret != 2) abort();
181      if ((wc & ~0x0020) == 0x00ca) {
182        /* A possible first character of a multi-character sequence. We have to
183           buffer it. */
184        if (!(buf[0] == 0x88 && (buf[1] == 0x66 || buf[1] == 0xa7))) abort();
185        conv->ostate = buf[1]; /* = 0x66 or = 0xa7 */
186        return count+0;
187      }
188      if (n >= count+2) {
189        r[0] = buf[0];
190        r[1] = buf[1];
191        conv->ostate = 0;
192        return count+2;
193      } else
194        return RET_TOOSMALL;
195    }
196    ret = hkscs2001_wctomb(conv,buf,wc,2);
197    if (ret != RET_ILUNI) {
198      if (ret != 2) abort();
199      if (n >= count+2) {
200        r[0] = buf[0];
201        r[1] = buf[1];
202        conv->ostate = 0;
203        return count+2;
204      } else
205        return RET_TOOSMALL;
206    }
207    ret = hkscs2004_wctomb(conv,buf,wc,2);
208    if (ret != RET_ILUNI) {
209      if (ret != 2) abort();
210      if (n >= count+2) {
211        r[0] = buf[0];
212        r[1] = buf[1];
213        conv->ostate = 0;
214        return count+2;
215      } else
216        return RET_TOOSMALL;
217    }
218    ret = hkscs2008_wctomb(conv,buf,wc,2);
219    if (ret != RET_ILUNI) {
220      if (ret != 2) abort();
221      if (n >= count+2) {
222        r[0] = buf[0];
223        r[1] = buf[1];
224        conv->ostate = 0;
225        return count+2;
226      } else
227        return RET_TOOSMALL;
228    }
229    return RET_ILUNI;
230  }
231}
232
233static int
234big5hkscs2008_reset (conv_t conv, unsigned char *r, int n)
235{
236  unsigned char last = conv->ostate;
237
238  if (last) {
239    if (n < 2)
240      return RET_TOOSMALL;
241    r[0] = 0x88;
242    r[1] = last;
243    /* conv->ostate = 0; will be done by the caller */
244    return 2;
245  } else
246    return 0;
247}
248