Annotation of embedaddon/libiconv/lib/gbk.h, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (C) 1999-2001, 2005, 2008 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: * GBK
23: */
24:
25: /*
26: * GBK, as described in Ken Lunde's book, is an extension of GB 2312-1980
27: * (shifted by adding 0x8080 to the range 0xA1A1..0xFEFE, as used in EUC-CN).
28: * It adds the following ranges:
29: *
30: * (part of GBK/1) 0xA2A1-0xA2AA Small Roman numerals
31: * GBK/3 0x{81-A0}{40-7E,80-FE} 6080 new characters, all in Unicode
32: * GBK/4 0x{AA-FE}{40-7E,80-A0} 8160 new characters, 8080 in Unicode
33: * GBK/5 0x{A8-A9}{40-7E,80-A0} 166 new characters, 153 in Unicode
34: *
35: * Furthermore, all four tables I have looked at
36: * - the CP936 table by Microsoft, found on ftp.unicode.org in 1999,
37: * - the GBK table by Sun, investigated on a Solaris 2.7 machine,
38: * - the GBK tables by CWEX, found in the Big5+ package,
39: * - the GB18030 standard (second printing),
40: * agree in the following extensions. (Ken Lunde must have overlooked these
41: * differences between GB2312 and GBK. Also, the CWEX tables have additional
42: * differences.)
43: *
44: * 1. Some characters in the GB2312 range are defined differently:
45: *
46: * code GB2312 GBK
47: * 0xA1A4 0x30FB # KATAKANA MIDDLE DOT 0x00B7 # MIDDLE DOT
48: * 0xA1AA 0x2015 # HORIZONTAL BAR 0x2014 # EM DASH
49: *
50: * 2. 19 characters added in the range 0xA6E0-0xA6F5.
51: *
52: * 3. 4 characters added in the range 0xA8BB-0xA8C0.
53: *
54: * CP936 as of 1999 was identical to GBK. However, since 1999, Microsoft has
55: * added new mappings to CP936...
56: */
57:
58: #include "gbkext1.h"
59: #include "gbkext2.h"
60: #include "gbkext_inv.h"
61: #include "cp936ext.h"
62:
63: static int
64: gbk_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
65: {
66: unsigned char c = *s;
67:
68: if (c >= 0x81 && c < 0xff) {
69: if (n < 2)
70: return RET_TOOFEW(0);
71: if (c >= 0xa1 && c <= 0xf7) {
72: unsigned char c2 = s[1];
73: if (c == 0xa1) {
74: if (c2 == 0xa4) {
75: *pwc = 0x00b7;
76: return 2;
77: }
78: if (c2 == 0xaa) {
79: *pwc = 0x2014;
80: return 2;
81: }
82: }
83: if (c2 >= 0xa1 && c2 < 0xff) {
84: unsigned char buf[2];
85: int ret;
86: buf[0] = c-0x80; buf[1] = c2-0x80;
87: ret = gb2312_mbtowc(conv,pwc,buf,2);
88: if (ret != RET_ILSEQ)
89: return ret;
90: buf[0] = c; buf[1] = c2;
91: ret = cp936ext_mbtowc(conv,pwc,buf,2);
92: if (ret != RET_ILSEQ)
93: return ret;
94: }
95: }
96: if (c >= 0x81 && c <= 0xa0)
97: return gbkext1_mbtowc(conv,pwc,s,2);
98: if (c >= 0xa8 && c <= 0xfe)
99: return gbkext2_mbtowc(conv,pwc,s,2);
100: if (c == 0xa2) {
101: unsigned char c2 = s[1];
102: if (c2 >= 0xa1 && c2 <= 0xaa) {
103: *pwc = 0x2170+(c2-0xa1);
104: return 2;
105: }
106: }
107: }
108: return RET_ILSEQ;
109: }
110:
111: static int
112: gbk_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
113: {
114: unsigned char buf[2];
115: int ret;
116:
117: if (wc != 0x30fb && wc != 0x2015) {
118: ret = gb2312_wctomb(conv,buf,wc,2);
119: if (ret != RET_ILUNI) {
120: if (ret != 2) abort();
121: if (n < 2)
122: return RET_TOOSMALL;
123: r[0] = buf[0]+0x80;
124: r[1] = buf[1]+0x80;
125: return 2;
126: }
127: }
128: ret = gbkext_inv_wctomb(conv,buf,wc,2);
129: if (ret != RET_ILUNI) {
130: if (ret != 2) abort();
131: if (n < 2)
132: return RET_TOOSMALL;
133: r[0] = buf[0];
134: r[1] = buf[1];
135: return 2;
136: }
137: if (wc >= 0x2170 && wc <= 0x2179) {
138: if (n < 2)
139: return RET_TOOSMALL;
140: r[0] = 0xa2;
141: r[1] = 0xa1 + (wc-0x2170);
142: return 2;
143: }
144: ret = cp936ext_wctomb(conv,buf,wc,2);
145: if (ret != RET_ILUNI) {
146: if (ret != 2) abort();
147: if (n < 2)
148: return RET_TOOSMALL;
149: r[0] = buf[0];
150: r[1] = buf[1];
151: return 2;
152: }
153: if (wc == 0x00b7) {
154: if (n < 2)
155: return RET_TOOSMALL;
156: r[0] = 0xa1;
157: r[1] = 0xa4;
158: return 2;
159: }
160: if (wc == 0x2014) {
161: if (n < 2)
162: return RET_TOOSMALL;
163: r[0] = 0xa1;
164: r[1] = 0xaa;
165: return 2;
166: }
167:
168: return RET_ILUNI;
169: }
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