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1 office 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 }