1 : /*
2 : * "streamable kanji code filter and converter"
3 : * Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
4 : *
5 : * LICENSE NOTICES
6 : *
7 : * This file is part of "streamable kanji code filter and converter",
8 : * which is distributed under the terms of GNU Lesser General Public
9 : * License (version 2) as published by the Free Software Foundation.
10 : *
11 : * This software is distributed in the hope that it will be useful,
12 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 : * GNU Lesser General Public License for more details.
15 : *
16 : * You should have received a copy of the GNU Lesser General Public
17 : * License along with "streamable kanji code filter and converter";
18 : * if not, write to the Free Software Foundation, Inc., 59 Temple Place,
19 : * Suite 330, Boston, MA 02111-1307 USA
20 : *
21 : * The author of this file:
22 : *
23 : */
24 : /*
25 : * The source code included in this files was separated from mbfilter_cn.c
26 : * by Moriyoshi Koizumi <moriyoshi@php.net> on 4 Dec 2002.
27 : *
28 : */
29 :
30 : #ifdef HAVE_CONFIG_H
31 : #include "config.h"
32 : #endif
33 :
34 : #include "mbfilter.h"
35 : #include "mbfilter_euc_cn.h"
36 :
37 : #include "unicode_table_cp936.h"
38 :
39 : static int mbfl_filt_ident_euccn(int c, mbfl_identify_filter *filter);
40 :
41 : static const unsigned char mblen_table_euccn[] = { /* 0xA1-0xFE */
42 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
43 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
44 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
45 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
46 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
47 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
48 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
49 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
50 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
51 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
52 : 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
53 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
54 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
55 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
56 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
57 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1
58 : };
59 :
60 : static const char *mbfl_encoding_euc_cn_aliases[] = {"CN-GB", "EUC_CN", "eucCN", "x-euc-cn", "gb2312", NULL};
61 :
62 : const mbfl_encoding mbfl_encoding_euc_cn = {
63 : mbfl_no_encoding_euc_cn,
64 : "EUC-CN",
65 : "CN-GB",
66 : (const char *(*)[])&mbfl_encoding_euc_cn_aliases,
67 : mblen_table_euccn,
68 : MBFL_ENCTYPE_MBCS
69 : };
70 :
71 : const struct mbfl_identify_vtbl vtbl_identify_euccn = {
72 : mbfl_no_encoding_euc_cn,
73 : mbfl_filt_ident_common_ctor,
74 : mbfl_filt_ident_common_dtor,
75 : mbfl_filt_ident_euccn
76 : };
77 :
78 : const struct mbfl_convert_vtbl vtbl_euccn_wchar = {
79 : mbfl_no_encoding_euc_cn,
80 : mbfl_no_encoding_wchar,
81 : mbfl_filt_conv_common_ctor,
82 : mbfl_filt_conv_common_dtor,
83 : mbfl_filt_conv_euccn_wchar,
84 : mbfl_filt_conv_common_flush
85 : };
86 :
87 : const struct mbfl_convert_vtbl vtbl_wchar_euccn = {
88 : mbfl_no_encoding_wchar,
89 : mbfl_no_encoding_euc_cn,
90 : mbfl_filt_conv_common_ctor,
91 : mbfl_filt_conv_common_dtor,
92 : mbfl_filt_conv_wchar_euccn,
93 : mbfl_filt_conv_common_flush
94 : };
95 :
96 : #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
97 :
98 : /*
99 : * EUC-CN => wchar
100 : */
101 : int
102 : mbfl_filt_conv_euccn_wchar(int c, mbfl_convert_filter *filter)
103 27 : {
104 : int c1, w;
105 :
106 27 : switch (filter->status) {
107 : case 0:
108 42 : if (c >= 0 && c < 0x80) { /* latin */
109 19 : CK((*filter->output_function)(c, filter->data));
110 8 : } else if (c > 0xa0 && c < 0xff) { /* dbcs lead byte */
111 4 : filter->status = 1;
112 4 : filter->cache = c;
113 : } else {
114 0 : w = c & MBFL_WCSGROUP_MASK;
115 0 : w |= MBFL_WCSGROUP_THROUGH;
116 0 : CK((*filter->output_function)(w, filter->data));
117 : }
118 23 : break;
119 :
120 : case 1: /* dbcs second byte */
121 4 : filter->status = 0;
122 4 : c1 = filter->cache;
123 8 : if (c1 > 0xa0 && c1 < 0xff && c > 0xa0 && c < 0xff) {
124 4 : w = (c1 - 0x81)*192 + (c - 0x40);
125 8 : if (w >= 0 && w < cp936_ucs_table_size) {
126 4 : w = cp936_ucs_table[w];
127 : } else {
128 0 : w = 0;
129 : }
130 4 : if (w <= 0) {
131 0 : w = (c1 << 8) | c;
132 0 : w &= MBFL_WCSPLANE_MASK;
133 0 : w |= MBFL_WCSPLANE_GB2312;
134 : }
135 4 : CK((*filter->output_function)(w, filter->data));
136 0 : } else if ((c >= 0 && c < 0x21) || c == 0x7f) { /* CTLs */
137 0 : CK((*filter->output_function)(c, filter->data));
138 : } else {
139 0 : w = (c1 << 8) | c;
140 0 : w &= MBFL_WCSGROUP_MASK;
141 0 : w |= MBFL_WCSGROUP_THROUGH;
142 0 : CK((*filter->output_function)(w, filter->data));
143 : }
144 4 : break;
145 :
146 : default:
147 0 : filter->status = 0;
148 : break;
149 : }
150 :
151 27 : return c;
152 : }
153 :
154 : /*
155 : * wchar => EUC-CN
156 : */
157 : int
158 : mbfl_filt_conv_wchar_euccn(int c, mbfl_convert_filter *filter)
159 0 : {
160 : int c1, c2, s;
161 :
162 0 : s = 0;
163 0 : if (c >= ucs_a1_cp936_table_min && c < ucs_a1_cp936_table_max) {
164 0 : s = ucs_a1_cp936_table[c - ucs_a1_cp936_table_min];
165 0 : } else if (c >= ucs_a2_cp936_table_min && c < ucs_a2_cp936_table_max) {
166 0 : s = ucs_a2_cp936_table[c - ucs_a2_cp936_table_min];
167 0 : } else if (c >= ucs_a3_cp936_table_min && c < ucs_a3_cp936_table_max) {
168 0 : s = ucs_a3_cp936_table[c - ucs_a3_cp936_table_min];
169 0 : } else if (c >= ucs_i_cp936_table_min && c < ucs_i_cp936_table_max) {
170 0 : s = ucs_i_cp936_table[c - ucs_i_cp936_table_min];
171 0 : } else if (c >= ucs_hff_cp936_table_min && c < ucs_hff_cp936_table_max) {
172 0 : s = ucs_hff_cp936_table[c - ucs_hff_cp936_table_min];
173 : }
174 0 : c1 = (s >> 8) & 0xff;
175 0 : c2 = s & 0xff;
176 :
177 0 : if (c1 < 0xa1 || c2 < 0xa1) { /* exclude CP936 extension */
178 0 : s = c;
179 : }
180 :
181 0 : if (s <= 0) {
182 0 : c1 = c & ~MBFL_WCSPLANE_MASK;
183 0 : if (c1 == MBFL_WCSPLANE_GB2312) {
184 0 : s = c & MBFL_WCSPLANE_MASK;
185 : }
186 0 : if (c == 0) {
187 0 : s = 0;
188 0 : } else if (s <= 0) {
189 0 : s = -1;
190 : }
191 : }
192 0 : if (s >= 0) {
193 0 : if (s < 0x80) { /* latin */
194 0 : CK((*filter->output_function)(s, filter->data));
195 : } else {
196 0 : CK((*filter->output_function)((s >> 8) & 0xff, filter->data));
197 0 : CK((*filter->output_function)(s & 0xff, filter->data));
198 : }
199 : } else {
200 0 : if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
201 0 : CK(mbfl_filt_conv_illegal_output(c, filter));
202 : }
203 : }
204 :
205 0 : return c;
206 : }
207 :
208 : static int mbfl_filt_ident_euccn(int c, mbfl_identify_filter *filter)
209 0 : {
210 0 : switch (filter->status) {
211 : case 0: /* latin */
212 0 : if (c >= 0 && c < 0x80) { /* ok */
213 : ;
214 0 : } else if (c > 0xa0 && c < 0xff) { /* DBCS lead byte */
215 0 : filter->status = 1;
216 : } else { /* bad */
217 0 : filter->flag = 1;
218 : }
219 0 : break;
220 :
221 : case 1: /* got lead byte */
222 0 : if (c < 0xa1 || c > 0xfe) { /* bad */
223 0 : filter->flag = 1;
224 : }
225 0 : filter->status = 0;
226 0 : break;
227 :
228 : default:
229 0 : filter->status = 0;
230 : break;
231 : }
232 :
233 0 : return c;
234 : }
235 :
236 :
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