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:
51: static int
52: big5hkscs2008_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:
123: static int
124: big5hkscs2008_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:
233: static int
234: big5hkscs2008_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: }
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