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, see <https://www.gnu.org/licenses/>.
18: */
19:
20: /*
21: * BIG5-HKSCS:2008
22: */
23:
24: /*
25: * BIG5-HKSCS:2008 can be downloaded from
26: * http://www.ogcio.gov.hk/ccli/eng/hkscs/download.html
27: * http://www.ogcio.gov.hk/ccli/eng/hkscs/introduction.html
28: *
29: * It extends BIG5-HKSCS:2004 through 68 characters.
30: *
31: * It extends BIG5 (without the rows 0xC6..0xC7) through the ranges
32: *
33: * 0x{87..8D}{40..7E,A1..FE} 880 characters
34: * 0x{8E..A0}{40..7E,A1..FE} 2898 characters
35: * 0x{C6..C8}{40..7E,A1..FE} 359 characters
36: * 0xF9{D6..FE} 41 characters
37: * 0x{FA..FE}{40..7E,A1..FE} 763 characters
38: *
39: * Note that some HKSCS characters are not contained in Unicode 3.2
40: * and are therefore best represented as sequences of Unicode characters:
41: * 0x8862 U+00CA U+0304 LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND MACRON
42: * 0x8864 U+00CA U+030C LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND CARON
43: * 0x88A3 U+00EA U+0304 LATIN SMALL LETTER E WITH CIRCUMFLEX AND MACRON
44: * 0x88A5 U+00EA U+030C LATIN SMALL LETTER E WITH CIRCUMFLEX AND CARON
45: */
46:
47: #include "hkscs2008.h"
48: #include "flushwc.h"
49:
50: static int
51: big5hkscs2008_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
52: {
53: ucs4_t last_wc = conv->istate;
54: if (last_wc) {
55: /* Output the buffered character. */
56: conv->istate = 0;
57: *pwc = last_wc;
58: return 0; /* Don't advance the input pointer. */
59: } else {
60: unsigned char c = *s;
61: /* Code set 0 (ASCII) */
62: if (c < 0x80)
63: return ascii_mbtowc(conv,pwc,s,n);
64: /* Code set 1 (BIG5 extended) */
65: if (c >= 0xa1 && c < 0xff) {
66: if (n < 2)
67: return RET_TOOFEW(0);
68: {
69: unsigned char c2 = s[1];
70: if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff)) {
71: if (!((c == 0xc6 && c2 >= 0xa1) || c == 0xc7)) {
72: int ret = big5_mbtowc(conv,pwc,s,2);
73: if (ret != RET_ILSEQ)
74: return ret;
75: }
76: }
77: }
78: }
79: {
80: int ret = hkscs1999_mbtowc(conv,pwc,s,n);
81: if (ret != RET_ILSEQ)
82: return ret;
83: }
84: {
85: int ret = hkscs2001_mbtowc(conv,pwc,s,n);
86: if (ret != RET_ILSEQ)
87: return ret;
88: }
89: {
90: int ret = hkscs2004_mbtowc(conv,pwc,s,n);
91: if (ret != RET_ILSEQ)
92: return ret;
93: }
94: {
95: int ret = hkscs2008_mbtowc(conv,pwc,s,n);
96: if (ret != RET_ILSEQ)
97: return ret;
98: }
99: if (c == 0x88) {
100: if (n < 2)
101: return RET_TOOFEW(0);
102: {
103: unsigned char c2 = s[1];
104: if (c2 == 0x62 || c2 == 0x64 || c2 == 0xa3 || c2 == 0xa5) {
105: /* It's a composed character. */
106: ucs4_t wc1 = ((c2 >> 3) << 2) + 0x009a; /* = 0x00ca or 0x00ea */
107: ucs4_t wc2 = ((c2 & 6) << 2) + 0x02fc; /* = 0x0304 or 0x030c */
108: /* We cannot output two Unicode characters at once. So,
109: output the first character and buffer the second one. */
110: *pwc = wc1;
111: conv->istate = wc2;
112: return 2;
113: }
114: }
115: }
116: return RET_ILSEQ;
117: }
118: }
119:
120: #define big5hkscs2008_flushwc normal_flushwc
121:
122: static int
123: big5hkscs2008_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
124: {
125: int count = 0;
126: unsigned char last = conv->ostate;
127:
128: if (last) {
129: /* last is = 0x66 or = 0xa7. */
130: if (wc == 0x0304 || wc == 0x030c) {
131: /* Output the combined character. */
132: if (n >= 2) {
133: r[0] = 0x88;
134: r[1] = last + ((wc & 24) >> 2) - 4; /* = 0x62 or 0x64 or 0xa3 or 0xa5 */
135: conv->ostate = 0;
136: return 2;
137: } else
138: return RET_TOOSMALL;
139: }
140:
141: /* Output the buffered character. */
142: if (n < 2)
143: return RET_TOOSMALL;
144: r[0] = 0x88;
145: r[1] = last;
146: r += 2;
147: count = 2;
148: }
149:
150: /* Code set 0 (ASCII) */
151: if (wc < 0x0080) {
152: /* Plain ASCII character. */
153: if (n > count) {
154: r[0] = (unsigned char) wc;
155: conv->ostate = 0;
156: return count+1;
157: } else
158: return RET_TOOSMALL;
159: } else {
160: unsigned char buf[2];
161: int ret;
162:
163: /* Code set 1 (BIG5 extended) */
164: ret = big5_wctomb(conv,buf,wc,2);
165: if (ret != RET_ILUNI) {
166: if (ret != 2) abort();
167: if (!((buf[0] == 0xc6 && buf[1] >= 0xa1) || buf[0] == 0xc7)) {
168: if (n >= count+2) {
169: r[0] = buf[0];
170: r[1] = buf[1];
171: conv->ostate = 0;
172: return count+2;
173: } else
174: return RET_TOOSMALL;
175: }
176: }
177: ret = hkscs1999_wctomb(conv,buf,wc,2);
178: if (ret != RET_ILUNI) {
179: if (ret != 2) abort();
180: if ((wc & ~0x0020) == 0x00ca) {
181: /* A possible first character of a multi-character sequence. We have to
182: buffer it. */
183: if (!(buf[0] == 0x88 && (buf[1] == 0x66 || buf[1] == 0xa7))) abort();
184: conv->ostate = buf[1]; /* = 0x66 or = 0xa7 */
185: return count+0;
186: }
187: if (n >= count+2) {
188: r[0] = buf[0];
189: r[1] = buf[1];
190: conv->ostate = 0;
191: return count+2;
192: } else
193: return RET_TOOSMALL;
194: }
195: ret = hkscs2001_wctomb(conv,buf,wc,2);
196: if (ret != RET_ILUNI) {
197: if (ret != 2) abort();
198: if (n >= count+2) {
199: r[0] = buf[0];
200: r[1] = buf[1];
201: conv->ostate = 0;
202: return count+2;
203: } else
204: return RET_TOOSMALL;
205: }
206: ret = hkscs2004_wctomb(conv,buf,wc,2);
207: if (ret != RET_ILUNI) {
208: if (ret != 2) abort();
209: if (n >= count+2) {
210: r[0] = buf[0];
211: r[1] = buf[1];
212: conv->ostate = 0;
213: return count+2;
214: } else
215: return RET_TOOSMALL;
216: }
217: ret = hkscs2008_wctomb(conv,buf,wc,2);
218: if (ret != RET_ILUNI) {
219: if (ret != 2) abort();
220: if (n >= count+2) {
221: r[0] = buf[0];
222: r[1] = buf[1];
223: conv->ostate = 0;
224: return count+2;
225: } else
226: return RET_TOOSMALL;
227: }
228: return RET_ILUNI;
229: }
230: }
231:
232: static int
233: big5hkscs2008_reset (conv_t conv, unsigned char *r, size_t n)
234: {
235: unsigned char last = conv->ostate;
236:
237: if (last) {
238: if (n < 2)
239: return RET_TOOSMALL;
240: r[0] = 0x88;
241: r[1] = last;
242: /* conv->ostate = 0; will be done by the caller */
243: return 2;
244: } else
245: return 0;
246: }
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