1: /*
2: * Copyright (C) 1999-2002, 2006, 2016 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:1999
22: */
23:
24: /*
25: * BIG5-HKSCS:1999 can be downloaded from
26: * http://www.info.gov.hk/digital21/eng/hkscs/download.html
27: * http://www.info.gov.hk/digital21/eng/hkscs/index.html
28: *
29: * It extends BIG5 (without the rows 0xC6..0xC7) through the ranges
30: *
31: * 0x{88..8D}{40..7E,A1..FE} 641 characters
32: * 0x{8E..A0}{40..7E,A1..FE} 2898 characters
33: * 0x{C6..C8}{40..7E,A1..FE} 359 characters
34: * 0xF9{D6..FE} 41 characters
35: * 0x{FA..FE}{40..7E,A1..FE} 763 characters
36: *
37: * Note that some HKSCS characters are not contained in Unicode 3.2
38: * and are therefore best represented as sequences of Unicode characters:
39: * 0x8862 U+00CA U+0304 LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND MACRON
40: * 0x8864 U+00CA U+030C LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND CARON
41: * 0x88A3 U+00EA U+0304 LATIN SMALL LETTER E WITH CIRCUMFLEX AND MACRON
42: * 0x88A5 U+00EA U+030C LATIN SMALL LETTER E WITH CIRCUMFLEX AND CARON
43: */
44:
45: #include "hkscs1999.h"
46: #include "flushwc.h"
47:
48: static int
49: big5hkscs1999_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
50: {
51: ucs4_t last_wc = conv->istate;
52: if (last_wc) {
53: /* Output the buffered character. */
54: conv->istate = 0;
55: *pwc = last_wc;
56: return 0; /* Don't advance the input pointer. */
57: } else {
58: unsigned char c = *s;
59: /* Code set 0 (ASCII) */
60: if (c < 0x80)
61: return ascii_mbtowc(conv,pwc,s,n);
62: /* Code set 1 (BIG5 extended) */
63: if (c >= 0xa1 && c < 0xff) {
64: if (n < 2)
65: return RET_TOOFEW(0);
66: {
67: unsigned char c2 = s[1];
68: if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff)) {
69: if (!((c == 0xc6 && c2 >= 0xa1) || c == 0xc7)) {
70: int ret = big5_mbtowc(conv,pwc,s,2);
71: if (ret != RET_ILSEQ)
72: return ret;
73: }
74: }
75: }
76: }
77: {
78: int ret = hkscs1999_mbtowc(conv,pwc,s,n);
79: if (ret != RET_ILSEQ)
80: return ret;
81: }
82: if (c == 0x88) {
83: if (n < 2)
84: return RET_TOOFEW(0);
85: {
86: unsigned char c2 = s[1];
87: if (c2 == 0x62 || c2 == 0x64 || c2 == 0xa3 || c2 == 0xa5) {
88: /* It's a composed character. */
89: ucs4_t wc1 = ((c2 >> 3) << 2) + 0x009a; /* = 0x00ca or 0x00ea */
90: ucs4_t wc2 = ((c2 & 6) << 2) + 0x02fc; /* = 0x0304 or 0x030c */
91: /* We cannot output two Unicode characters at once. So,
92: output the first character and buffer the second one. */
93: *pwc = wc1;
94: conv->istate = wc2;
95: return 2;
96: }
97: }
98: }
99: return RET_ILSEQ;
100: }
101: }
102:
103: #define big5hkscs1999_flushwc normal_flushwc
104:
105: static int
106: big5hkscs1999_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
107: {
108: int count = 0;
109: unsigned char last = conv->ostate;
110:
111: if (last) {
112: /* last is = 0x66 or = 0xa7. */
113: if (wc == 0x0304 || wc == 0x030c) {
114: /* Output the combined character. */
115: if (n >= 2) {
116: r[0] = 0x88;
117: r[1] = last + ((wc & 24) >> 2) - 4; /* = 0x62 or 0x64 or 0xa3 or 0xa5 */
118: conv->ostate = 0;
119: return 2;
120: } else
121: return RET_TOOSMALL;
122: }
123:
124: /* Output the buffered character. */
125: if (n < 2)
126: return RET_TOOSMALL;
127: r[0] = 0x88;
128: r[1] = last;
129: r += 2;
130: count = 2;
131: }
132:
133: /* Code set 0 (ASCII) */
134: if (wc < 0x0080) {
135: /* Plain ASCII character. */
136: if (n > count) {
137: r[0] = (unsigned char) wc;
138: conv->ostate = 0;
139: return count+1;
140: } else
141: return RET_TOOSMALL;
142: } else {
143: unsigned char buf[2];
144: int ret;
145:
146: /* Code set 1 (BIG5 extended) */
147: ret = big5_wctomb(conv,buf,wc,2);
148: if (ret != RET_ILUNI) {
149: if (ret != 2) abort();
150: if (!((buf[0] == 0xc6 && buf[1] >= 0xa1) || buf[0] == 0xc7)) {
151: if (n >= count+2) {
152: r[0] = buf[0];
153: r[1] = buf[1];
154: conv->ostate = 0;
155: return count+2;
156: } else
157: return RET_TOOSMALL;
158: }
159: }
160: ret = hkscs1999_wctomb(conv,buf,wc,2);
161: if (ret != RET_ILUNI) {
162: if (ret != 2) abort();
163: if ((wc & ~0x0020) == 0x00ca) {
164: /* A possible first character of a multi-character sequence. We have to
165: buffer it. */
166: if (!(buf[0] == 0x88 && (buf[1] == 0x66 || buf[1] == 0xa7))) abort();
167: conv->ostate = buf[1]; /* = 0x66 or = 0xa7 */
168: return count+0;
169: }
170: if (n >= count+2) {
171: r[0] = buf[0];
172: r[1] = buf[1];
173: conv->ostate = 0;
174: return count+2;
175: } else
176: return RET_TOOSMALL;
177: }
178: return RET_ILUNI;
179: }
180: }
181:
182: static int
183: big5hkscs1999_reset (conv_t conv, unsigned char *r, size_t n)
184: {
185: unsigned char last = conv->ostate;
186:
187: if (last) {
188: if (n < 2)
189: return RET_TOOSMALL;
190: r[0] = 0x88;
191: r[1] = last;
192: /* conv->ostate = 0; will be done by the caller */
193: return 2;
194: } else
195: return 0;
196: }
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