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:2001
23: */
24:
25: /*
26: * BIG5-HKSCS:2001 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:1999 through 116 characters.
31: *
32: * It extends BIG5 (without the rows 0xC6..0xC7) through the ranges
33: *
34: * 0x{88..8D}{40..7E,A1..FE} 757 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 "hkscs2001.h"
49: #include "flushwc.h"
50:
51: static int
52: big5hkscs2001_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: if (c == 0x88) {
91: if (n < 2)
92: return RET_TOOFEW(0);
93: {
94: unsigned char c2 = s[1];
95: if (c2 == 0x62 || c2 == 0x64 || c2 == 0xa3 || c2 == 0xa5) {
96: /* It's a composed character. */
97: ucs4_t wc1 = ((c2 >> 3) << 2) + 0x009a; /* = 0x00ca or 0x00ea */
98: ucs4_t wc2 = ((c2 & 6) << 2) + 0x02fc; /* = 0x0304 or 0x030c */
99: /* We cannot output two Unicode characters at once. So,
100: output the first character and buffer the second one. */
101: *pwc = wc1;
102: conv->istate = wc2;
103: return 2;
104: }
105: }
106: }
107: return RET_ILSEQ;
108: }
109: }
110:
111: #define big5hkscs2001_flushwc normal_flushwc
112:
113: static int
114: big5hkscs2001_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
115: {
116: int count = 0;
117: unsigned char last = conv->ostate;
118:
119: if (last) {
120: /* last is = 0x66 or = 0xa7. */
121: if (wc == 0x0304 || wc == 0x030c) {
122: /* Output the combined character. */
123: if (n >= 2) {
124: r[0] = 0x88;
125: r[1] = last + ((wc & 24) >> 2) - 4; /* = 0x62 or 0x64 or 0xa3 or 0xa5 */
126: conv->ostate = 0;
127: return 2;
128: } else
129: return RET_TOOSMALL;
130: }
131:
132: /* Output the buffered character. */
133: if (n < 2)
134: return RET_TOOSMALL;
135: r[0] = 0x88;
136: r[1] = last;
137: r += 2;
138: count = 2;
139: }
140:
141: /* Code set 0 (ASCII) */
142: if (wc < 0x0080) {
143: /* Plain ASCII character. */
144: if (n > count) {
145: r[0] = (unsigned char) wc;
146: conv->ostate = 0;
147: return count+1;
148: } else
149: return RET_TOOSMALL;
150: } else {
151: unsigned char buf[2];
152: int ret;
153:
154: /* Code set 1 (BIG5 extended) */
155: ret = big5_wctomb(conv,buf,wc,2);
156: if (ret != RET_ILUNI) {
157: if (ret != 2) abort();
158: if (!((buf[0] == 0xc6 && buf[1] >= 0xa1) || buf[0] == 0xc7)) {
159: if (n >= count+2) {
160: r[0] = buf[0];
161: r[1] = buf[1];
162: conv->ostate = 0;
163: return count+2;
164: } else
165: return RET_TOOSMALL;
166: }
167: }
168: ret = hkscs1999_wctomb(conv,buf,wc,2);
169: if (ret != RET_ILUNI) {
170: if (ret != 2) abort();
171: if ((wc & ~0x0020) == 0x00ca) {
172: /* A possible first character of a multi-character sequence. We have to
173: buffer it. */
174: if (!(buf[0] == 0x88 && (buf[1] == 0x66 || buf[1] == 0xa7))) abort();
175: conv->ostate = buf[1]; /* = 0x66 or = 0xa7 */
176: return count+0;
177: }
178: if (n >= count+2) {
179: r[0] = buf[0];
180: r[1] = buf[1];
181: conv->ostate = 0;
182: return count+2;
183: } else
184: return RET_TOOSMALL;
185: }
186: ret = hkscs2001_wctomb(conv,buf,wc,2);
187: if (ret != RET_ILUNI) {
188: if (ret != 2) abort();
189: if (n >= count+2) {
190: r[0] = buf[0];
191: r[1] = buf[1];
192: conv->ostate = 0;
193: return count+2;
194: } else
195: return RET_TOOSMALL;
196: }
197: return RET_ILUNI;
198: }
199: }
200:
201: static int
202: big5hkscs2001_reset (conv_t conv, unsigned char *r, int n)
203: {
204: unsigned char last = conv->ostate;
205:
206: if (last) {
207: if (n < 2)
208: return RET_TOOSMALL;
209: r[0] = 0x88;
210: r[1] = last;
211: /* conv->ostate = 0; will be done by the caller */
212: return 2;
213: } else
214: return 0;
215: }
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