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: Rui Hirokawa <hirokawa@php.net>
22 : *
23 : */
24 : /*
25 : * The source code included in this files was separated from mbfilter_tw.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_big5.h"
36 :
37 : #include "unicode_table_big5.h"
38 :
39 : static int mbfl_filt_ident_big5(int c, mbfl_identify_filter *filter);
40 :
41 : static const unsigned char mblen_table_big5[] = { /* 0x81-0xFE */
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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
51 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
52 : 2, 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_big5_aliases[] = {"CN-BIG5", "BIG-FIVE", "BIGFIVE", "CP950", NULL};
61 :
62 : const mbfl_encoding mbfl_encoding_big5 = {
63 : mbfl_no_encoding_big5,
64 : "BIG-5",
65 : "BIG5",
66 : (const char *(*)[])&mbfl_encoding_big5_aliases,
67 : mblen_table_big5,
68 : MBFL_ENCTYPE_MBCS
69 : };
70 :
71 : const struct mbfl_identify_vtbl vtbl_identify_big5 = {
72 : mbfl_no_encoding_big5,
73 : mbfl_filt_ident_common_ctor,
74 : mbfl_filt_ident_common_dtor,
75 : mbfl_filt_ident_big5
76 : };
77 :
78 : const struct mbfl_convert_vtbl vtbl_big5_wchar = {
79 : mbfl_no_encoding_big5,
80 : mbfl_no_encoding_wchar,
81 : mbfl_filt_conv_common_ctor,
82 : mbfl_filt_conv_common_dtor,
83 : mbfl_filt_conv_big5_wchar,
84 : mbfl_filt_conv_common_flush
85 : };
86 :
87 : const struct mbfl_convert_vtbl vtbl_wchar_big5 = {
88 : mbfl_no_encoding_wchar,
89 : mbfl_no_encoding_big5,
90 : mbfl_filt_conv_common_ctor,
91 : mbfl_filt_conv_common_dtor,
92 : mbfl_filt_conv_wchar_big5,
93 : mbfl_filt_conv_common_flush
94 : };
95 :
96 : #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
97 :
98 : /*
99 : * Big5 => wchar
100 : */
101 : int
102 : mbfl_filt_conv_big5_wchar(int c, mbfl_convert_filter *filter)
103 28 : {
104 : int c1, w;
105 :
106 28 : switch (filter->status) {
107 : case 0:
108 44 : if (c >= 0 && c < 0x80) { /* latin */
109 20 : 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 24 : break;
119 :
120 : case 1: /* dbcs second byte */
121 4 : filter->status = 0;
122 4 : c1 = filter->cache;
123 4 : if ((c > 0x39 && c < 0x7f) | (c > 0xa0 && c < 0xff)) {
124 4 : if (c < 0x7f){
125 0 : w = (c1 - 0xa1)*157 + (c - 0x40);
126 : } else {
127 4 : w = (c1 - 0xa1)*157 + (c - 0xa1) + 0x3f;
128 : }
129 8 : if (w >= 0 && w < big5_ucs_table_size) {
130 4 : w = big5_ucs_table[w];
131 : } else {
132 0 : w = 0;
133 : }
134 4 : if (w <= 0) {
135 0 : w = (c1 << 8) | c;
136 0 : w &= MBFL_WCSPLANE_MASK;
137 0 : w |= MBFL_WCSPLANE_BIG5;
138 : }
139 4 : CK((*filter->output_function)(w, filter->data));
140 0 : } else if ((c >= 0 && c < 0x21) || c == 0x7f) { /* CTLs */
141 0 : CK((*filter->output_function)(c, filter->data));
142 : } else {
143 0 : w = (c1 << 8) | c;
144 0 : w &= MBFL_WCSGROUP_MASK;
145 0 : w |= MBFL_WCSGROUP_THROUGH;
146 0 : CK((*filter->output_function)(w, filter->data));
147 : }
148 4 : break;
149 :
150 : default:
151 0 : filter->status = 0;
152 : break;
153 : }
154 :
155 28 : return c;
156 : }
157 :
158 : /*
159 : * wchar => Big5
160 : */
161 : int
162 : mbfl_filt_conv_wchar_big5(int c, mbfl_convert_filter *filter)
163 45 : {
164 : int c1, s;
165 :
166 45 : s = 0;
167 85 : if (c >= ucs_a1_big5_table_min && c < ucs_a1_big5_table_max) {
168 40 : s = ucs_a1_big5_table[c - ucs_a1_big5_table_min];
169 5 : } else if (c >= ucs_a2_big5_table_min && c < ucs_a2_big5_table_max) {
170 0 : s = ucs_a2_big5_table[c - ucs_a2_big5_table_min];
171 5 : } else if (c >= ucs_a3_big5_table_min && c < ucs_a3_big5_table_max) {
172 0 : s = ucs_a3_big5_table[c - ucs_a3_big5_table_min];
173 10 : } else if (c >= ucs_i_big5_table_min && c < ucs_i_big5_table_max) {
174 5 : s = ucs_i_big5_table[c - ucs_i_big5_table_min];
175 0 : } else if (c >= ucs_pua_big5_table_min && c < ucs_pua_big5_table_max) {
176 0 : s = ucs_pua_big5_table[c - ucs_pua_big5_table_min];
177 0 : } else if (c >= ucs_r1_big5_table_min && c < ucs_r1_big5_table_max) {
178 0 : s = ucs_r1_big5_table[c - ucs_r1_big5_table_min];
179 0 : } else if (c >= ucs_r2_big5_table_min && c < ucs_r2_big5_table_max) {
180 0 : s = ucs_r2_big5_table[c - ucs_r2_big5_table_min];
181 : }
182 45 : if (s <= 0) {
183 0 : c1 = c & ~MBFL_WCSPLANE_MASK;
184 0 : if (c1 == MBFL_WCSPLANE_BIG5) {
185 0 : s = c & MBFL_WCSPLANE_MASK;
186 : }
187 0 : if (c == 0) {
188 0 : s = 0;
189 0 : } else if (s <= 0) {
190 0 : s = -1;
191 : }
192 : }
193 45 : if (s >= 0) {
194 45 : if (s < 0x80) { /* latin */
195 40 : CK((*filter->output_function)(s, filter->data));
196 : } else {
197 5 : CK((*filter->output_function)((s >> 8) & 0xff, filter->data));
198 5 : CK((*filter->output_function)(s & 0xff, filter->data));
199 : }
200 : } else {
201 0 : if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
202 0 : CK(mbfl_filt_conv_illegal_output(c, filter));
203 : }
204 : }
205 :
206 45 : return c;
207 : }
208 :
209 : static int mbfl_filt_ident_big5(int c, mbfl_identify_filter *filter)
210 0 : {
211 0 : if (filter->status) { /* kanji second char */
212 0 : if (c < 0x40 || (c > 0x7e && c < 0xa1) ||c > 0xfe) { /* bad */
213 0 : filter->flag = 1;
214 : }
215 0 : filter->status = 0;
216 0 : } else if (c >= 0 && c < 0x80) { /* latin ok */
217 : ;
218 0 : } else if (c > 0xa0 && c < 0xff) { /* DBCS lead byte */
219 0 : filter->status = 1;
220 : } else { /* bad */
221 0 : filter->flag = 1;
222 : }
223 :
224 0 : return c;
225 : }
226 :
227 :
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