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:1999
23: */
24:
25: /*
26: * BIG5-HKSCS:1999 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 (without the rows 0xC6..0xC7) through the ranges
31: *
32: * 0x{88..8D}{40..7E,A1..FE} 641 characters
33: * 0x{8E..A0}{40..7E,A1..FE} 2898 characters
34: * 0x{C6..C8}{40..7E,A1..FE} 359 characters
35: * 0xF9{D6..FE} 41 characters
36: * 0x{FA..FE}{40..7E,A1..FE} 763 characters
37: *
38: * Note that some HKSCS characters are not contained in Unicode 3.2
39: * and are therefore best represented as sequences of Unicode characters:
40: * 0x8862 U+00CA U+0304 LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND MACRON
41: * 0x8864 U+00CA U+030C LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND CARON
42: * 0x88A3 U+00EA U+0304 LATIN SMALL LETTER E WITH CIRCUMFLEX AND MACRON
43: * 0x88A5 U+00EA U+030C LATIN SMALL LETTER E WITH CIRCUMFLEX AND CARON
44: */
45:
46: #include "hkscs1999.h"
47: #include "flushwc.h"
48:
49: static int
50: big5hkscs1999_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
51: {
52: ucs4_t last_wc = conv->istate;
53: if (last_wc) {
54: /* Output the buffered character. */
55: conv->istate = 0;
56: *pwc = last_wc;
57: return 0; /* Don't advance the input pointer. */
58: } else {
59: unsigned char c = *s;
60: /* Code set 0 (ASCII) */
61: if (c < 0x80)
62: return ascii_mbtowc(conv,pwc,s,n);
63: /* Code set 1 (BIG5 extended) */
64: if (c >= 0xa1 && c < 0xff) {
65: if (n < 2)
66: return RET_TOOFEW(0);
67: {
68: unsigned char c2 = s[1];
69: if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff)) {
70: if (!((c == 0xc6 && c2 >= 0xa1) || c == 0xc7)) {
71: int ret = big5_mbtowc(conv,pwc,s,2);
72: if (ret != RET_ILSEQ)
73: return ret;
74: }
75: }
76: }
77: }
78: {
79: int ret = hkscs1999_mbtowc(conv,pwc,s,n);
80: if (ret != RET_ILSEQ)
81: return ret;
82: }
83: if (c == 0x88) {
84: if (n < 2)
85: return RET_TOOFEW(0);
86: {
87: unsigned char c2 = s[1];
88: if (c2 == 0x62 || c2 == 0x64 || c2 == 0xa3 || c2 == 0xa5) {
89: /* It's a composed character. */
90: ucs4_t wc1 = ((c2 >> 3) << 2) + 0x009a; /* = 0x00ca or 0x00ea */
91: ucs4_t wc2 = ((c2 & 6) << 2) + 0x02fc; /* = 0x0304 or 0x030c */
92: /* We cannot output two Unicode characters at once. So,
93: output the first character and buffer the second one. */
94: *pwc = wc1;
95: conv->istate = wc2;
96: return 2;
97: }
98: }
99: }
100: return RET_ILSEQ;
101: }
102: }
103:
104: #define big5hkscs1999_flushwc normal_flushwc
105:
106: static int
107: big5hkscs1999_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
108: {
109: int count = 0;
110: unsigned char last = conv->ostate;
111:
112: if (last) {
113: /* last is = 0x66 or = 0xa7. */
114: if (wc == 0x0304 || wc == 0x030c) {
115: /* Output the combined character. */
116: if (n >= 2) {
117: r[0] = 0x88;
118: r[1] = last + ((wc & 24) >> 2) - 4; /* = 0x62 or 0x64 or 0xa3 or 0xa5 */
119: conv->ostate = 0;
120: return 2;
121: } else
122: return RET_TOOSMALL;
123: }
124:
125: /* Output the buffered character. */
126: if (n < 2)
127: return RET_TOOSMALL;
128: r[0] = 0x88;
129: r[1] = last;
130: r += 2;
131: count = 2;
132: }
133:
134: /* Code set 0 (ASCII) */
135: if (wc < 0x0080) {
136: /* Plain ASCII character. */
137: if (n > count) {
138: r[0] = (unsigned char) wc;
139: conv->ostate = 0;
140: return count+1;
141: } else
142: return RET_TOOSMALL;
143: } else {
144: unsigned char buf[2];
145: int ret;
146:
147: /* Code set 1 (BIG5 extended) */
148: ret = big5_wctomb(conv,buf,wc,2);
149: if (ret != RET_ILUNI) {
150: if (ret != 2) abort();
151: if (!((buf[0] == 0xc6 && buf[1] >= 0xa1) || buf[0] == 0xc7)) {
152: if (n >= count+2) {
153: r[0] = buf[0];
154: r[1] = buf[1];
155: conv->ostate = 0;
156: return count+2;
157: } else
158: return RET_TOOSMALL;
159: }
160: }
161: ret = hkscs1999_wctomb(conv,buf,wc,2);
162: if (ret != RET_ILUNI) {
163: if (ret != 2) abort();
164: if ((wc & ~0x0020) == 0x00ca) {
165: /* A possible first character of a multi-character sequence. We have to
166: buffer it. */
167: if (!(buf[0] == 0x88 && (buf[1] == 0x66 || buf[1] == 0xa7))) abort();
168: conv->ostate = buf[1]; /* = 0x66 or = 0xa7 */
169: return count+0;
170: }
171: if (n >= count+2) {
172: r[0] = buf[0];
173: r[1] = buf[1];
174: conv->ostate = 0;
175: return count+2;
176: } else
177: return RET_TOOSMALL;
178: }
179: return RET_ILUNI;
180: }
181: }
182:
183: static int
184: big5hkscs1999_reset (conv_t conv, unsigned char *r, int n)
185: {
186: unsigned char last = conv->ostate;
187:
188: if (last) {
189: if (n < 2)
190: return RET_TOOSMALL;
191: r[0] = 0x88;
192: r[1] = last;
193: /* conv->ostate = 0; will be done by the caller */
194: return 2;
195: } else
196: return 0;
197: }
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