1: /*
2: * Copyright (C) 1999-2002, 2006 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:2004
23: */
24:
25: /*
26: * BIG5-HKSCS:2004 can be downloaded from
27: * http://www.info.gov.hk/digital21/eng/hkscs/download.html
28: * http://www.info.gov.hk/digital21/eng/hkscs/index.html
29: *
30: * It extends BIG5-HKSCS:2001 through 123 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 "hkscs2004.h"
49: #include "flushwc.h"
50:
51: static int
52: big5hkscs2004_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: if (c == 0x88) {
96: if (n < 2)
97: return RET_TOOFEW(0);
98: {
99: unsigned char c2 = s[1];
100: if (c2 == 0x62 || c2 == 0x64 || c2 == 0xa3 || c2 == 0xa5) {
101: /* It's a composed character. */
102: ucs4_t wc1 = ((c2 >> 3) << 2) + 0x009a; /* = 0x00ca or 0x00ea */
103: ucs4_t wc2 = ((c2 & 6) << 2) + 0x02fc; /* = 0x0304 or 0x030c */
104: /* We cannot output two Unicode characters at once. So,
105: output the first character and buffer the second one. */
106: *pwc = wc1;
107: conv->istate = wc2;
108: return 2;
109: }
110: }
111: }
112: return RET_ILSEQ;
113: }
114: }
115:
116: #define big5hkscs2004_flushwc normal_flushwc
117:
118: static int
119: big5hkscs2004_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
120: {
121: int count = 0;
122: unsigned char last = conv->ostate;
123:
124: if (last) {
125: /* last is = 0x66 or = 0xa7. */
126: if (wc == 0x0304 || wc == 0x030c) {
127: /* Output the combined character. */
128: if (n >= 2) {
129: r[0] = 0x88;
130: r[1] = last + ((wc & 24) >> 2) - 4; /* = 0x62 or 0x64 or 0xa3 or 0xa5 */
131: conv->ostate = 0;
132: return 2;
133: } else
134: return RET_TOOSMALL;
135: }
136:
137: /* Output the buffered character. */
138: if (n < 2)
139: return RET_TOOSMALL;
140: r[0] = 0x88;
141: r[1] = last;
142: r += 2;
143: count = 2;
144: }
145:
146: /* Code set 0 (ASCII) */
147: if (wc < 0x0080) {
148: /* Plain ASCII character. */
149: if (n > count) {
150: r[0] = (unsigned char) wc;
151: conv->ostate = 0;
152: return count+1;
153: } else
154: return RET_TOOSMALL;
155: } else {
156: unsigned char buf[2];
157: int ret;
158:
159: /* Code set 1 (BIG5 extended) */
160: ret = big5_wctomb(conv,buf,wc,2);
161: if (ret != RET_ILUNI) {
162: if (ret != 2) abort();
163: if (!((buf[0] == 0xc6 && buf[1] >= 0xa1) || buf[0] == 0xc7)) {
164: if (n >= count+2) {
165: r[0] = buf[0];
166: r[1] = buf[1];
167: conv->ostate = 0;
168: return count+2;
169: } else
170: return RET_TOOSMALL;
171: }
172: }
173: ret = hkscs1999_wctomb(conv,buf,wc,2);
174: if (ret != RET_ILUNI) {
175: if (ret != 2) abort();
176: if ((wc & ~0x0020) == 0x00ca) {
177: /* A possible first character of a multi-character sequence. We have to
178: buffer it. */
179: if (!(buf[0] == 0x88 && (buf[1] == 0x66 || buf[1] == 0xa7))) abort();
180: conv->ostate = buf[1]; /* = 0x66 or = 0xa7 */
181: return count+0;
182: }
183: if (n >= count+2) {
184: r[0] = buf[0];
185: r[1] = buf[1];
186: conv->ostate = 0;
187: return count+2;
188: } else
189: return RET_TOOSMALL;
190: }
191: ret = hkscs2001_wctomb(conv,buf,wc,2);
192: if (ret != RET_ILUNI) {
193: if (ret != 2) abort();
194: if (n >= count+2) {
195: r[0] = buf[0];
196: r[1] = buf[1];
197: conv->ostate = 0;
198: return count+2;
199: } else
200: return RET_TOOSMALL;
201: }
202: ret = hkscs2004_wctomb(conv,buf,wc,2);
203: if (ret != RET_ILUNI) {
204: if (ret != 2) abort();
205: if (n >= count+2) {
206: r[0] = buf[0];
207: r[1] = buf[1];
208: conv->ostate = 0;
209: return count+2;
210: } else
211: return RET_TOOSMALL;
212: }
213: return RET_ILUNI;
214: }
215: }
216:
217: static int
218: big5hkscs2004_reset (conv_t conv, unsigned char *r, int n)
219: {
220: unsigned char last = conv->ostate;
221:
222: if (last) {
223: if (n < 2)
224: return RET_TOOSMALL;
225: r[0] = 0x88;
226: r[1] = last;
227: /* conv->ostate = 0; will be done by the caller */
228: return 2;
229: } else
230: return 0;
231: }
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