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 #include "mbfilter.h"
31 #include "mbfilter_hz.h"
32
33 #include "unicode_table_cp936.h"
34
35 static int mbfl_filt_ident_hz(int c, mbfl_identify_filter *filter);
36
37 const mbfl_encoding mbfl_encoding_hz = {
38 mbfl_no_encoding_hz,
39 "HZ",
40 "HZ-GB-2312",
41 NULL,
42 NULL,
43 MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_GL_UNSAFE,
44 &vtbl_hz_wchar,
45 &vtbl_wchar_hz
46 };
47
48 const struct mbfl_identify_vtbl vtbl_identify_hz = {
49 mbfl_no_encoding_hz,
50 mbfl_filt_ident_common_ctor,
51 mbfl_filt_ident_hz
52 };
53
54 const struct mbfl_convert_vtbl vtbl_hz_wchar = {
55 mbfl_no_encoding_hz,
56 mbfl_no_encoding_wchar,
57 mbfl_filt_conv_common_ctor,
58 NULL,
59 mbfl_filt_conv_hz_wchar,
60 mbfl_filt_conv_common_flush,
61 NULL,
62 };
63
64 const struct mbfl_convert_vtbl vtbl_wchar_hz = {
65 mbfl_no_encoding_wchar,
66 mbfl_no_encoding_hz,
67 mbfl_filt_conv_common_ctor,
68 NULL,
69 mbfl_filt_conv_wchar_hz,
70 mbfl_filt_conv_any_hz_flush,
71 NULL,
72 };
73
74 #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
75
76 /*
77 * HZ => wchar
78 */
79 int
mbfl_filt_conv_hz_wchar(int c,mbfl_convert_filter * filter)80 mbfl_filt_conv_hz_wchar(int c, mbfl_convert_filter *filter)
81 {
82 int c1, s, w;
83
84 switch (filter->status & 0xf) {
85 /* case 0x00: ASCII */
86 /* case 0x10: GB2312 */
87 case 0:
88 if (c == 0x7e) {
89 filter->status += 2;
90 } else if (filter->status == 0x10 && c > 0x20 && c < 0x7f) { /* DBCS first char */
91 filter->cache = c;
92 filter->status += 1;
93 } else if (c >= 0 && c < 0x80) { /* latin, CTLs */
94 CK((*filter->output_function)(c, filter->data));
95 } else {
96 w = c & MBFL_WCSGROUP_MASK;
97 w |= MBFL_WCSGROUP_THROUGH;
98 CK((*filter->output_function)(w, filter->data));
99 }
100 break;
101
102 /* case 0x11: GB2312 second char */
103 case 1:
104 filter->status &= ~0xf;
105 c1 = filter->cache;
106 if (c1 > 0x20 && c1 < 0x7f && c > 0x20 && c < 0x7f) {
107 s = (c1 - 1)*192 + c + 0x40; /* GB2312 */
108 if (s >= 0 && s < cp936_ucs_table_size) {
109 w = cp936_ucs_table[s];
110 } else {
111 w = 0;
112 }
113 if (w <= 0) {
114 w = (c1 << 8) | c;
115 w &= MBFL_WCSPLANE_MASK;
116 w |= MBFL_WCSPLANE_GB2312;
117 }
118 CK((*filter->output_function)(w, filter->data));
119 } else if ((c >= 0 && c < 0x21) || c == 0x7f) { /* CTLs */
120 CK((*filter->output_function)(c, filter->data));
121 } else {
122 w = (c1 << 8) | c;
123 w &= MBFL_WCSGROUP_MASK;
124 w |= MBFL_WCSGROUP_THROUGH;
125 CK((*filter->output_function)(w, filter->data));
126 }
127 break;
128
129 /* '~' */
130 case 2:
131 if (c == 0x7d) { /* '}' */
132 filter->status = 0x0;
133 } else if (c == 0x7b) { /* '{' */
134 filter->status = 0x10;
135 } else if (c == 0x7e) { /* '~' */
136 filter->status = 0x0;
137 CK((*filter->output_function)(0x007e, filter->data));
138 }
139 break;
140
141 default:
142 filter->status = 0;
143 break;
144 }
145
146 return c;
147 }
148
149 /*
150 * wchar => HZ
151 */
152 int
mbfl_filt_conv_wchar_hz(int c,mbfl_convert_filter * filter)153 mbfl_filt_conv_wchar_hz(int c, mbfl_convert_filter *filter)
154 {
155 int s;
156
157 s = 0;
158 if (c >= ucs_a1_cp936_table_min && c < ucs_a1_cp936_table_max) {
159 s = ucs_a1_cp936_table[c - ucs_a1_cp936_table_min];
160 } else if (c >= ucs_a2_cp936_table_min && c < ucs_a2_cp936_table_max) {
161 s = ucs_a2_cp936_table[c - ucs_a2_cp936_table_min];
162 } else if (c >= ucs_a3_cp936_table_min && c < ucs_a3_cp936_table_max) {
163 s = ucs_a3_cp936_table[c - ucs_a3_cp936_table_min];
164 } else if (c >= ucs_i_cp936_table_min && c < ucs_i_cp936_table_max) {
165 s = ucs_i_cp936_table[c - ucs_i_cp936_table_min];
166 } else if (c >= ucs_hff_cp936_table_min && c < ucs_hff_cp936_table_max) {
167 if (c == 0xff04) {
168 s = 0xa1e7;
169 } else if (c == 0xff5e) {
170 s = 0xa1ab;
171 } else if (c >= 0xff01 && c <= 0xff5d) {
172 s = c - 0xff01 + 0xa3a1;
173 } else if (c >= 0xffe0 && c <= 0xffe5) {
174 s = ucs_hff_s_cp936_table[c-0xffe0];
175 }
176 }
177 if (s & 0x8000) {
178 s -= 0x8080;
179 }
180
181 if (s <= 0) {
182 if (c == 0) {
183 s = 0;
184 } else if (s <= 0) {
185 s = -1;
186 }
187 } else if ((s >= 0x80 && s < 0x2121) || (s > 0x8080)) {
188 s = -1;
189 }
190 if (s >= 0) {
191 if (s < 0x80) { /* ASCII */
192 if ((filter->status & 0xff00) != 0) {
193 CK((*filter->output_function)(0x7e, filter->data)); /* '~' */
194 CK((*filter->output_function)(0x7d, filter->data)); /* '}' */
195 }
196 filter->status = 0;
197 if (s == 0x7e){
198 CK((*filter->output_function)(0x7e, filter->data));
199 }
200 CK((*filter->output_function)(s, filter->data));
201 } else { /* GB 2312-80 */
202 if ((filter->status & 0xff00) != 0x200) {
203 CK((*filter->output_function)(0x7e, filter->data)); /* '~' */
204 CK((*filter->output_function)(0x7b, filter->data)); /* '{' */
205 }
206 filter->status = 0x200;
207 CK((*filter->output_function)((s >> 8) & 0x7f, filter->data));
208 CK((*filter->output_function)(s & 0x7f, filter->data));
209 }
210 } else {
211 CK(mbfl_filt_conv_illegal_output(c, filter));
212 }
213
214 return c;
215 }
216
217 int
mbfl_filt_conv_any_hz_flush(mbfl_convert_filter * filter)218 mbfl_filt_conv_any_hz_flush(mbfl_convert_filter *filter)
219 {
220 /* back to latin */
221 if ((filter->status & 0xff00) != 0) {
222 CK((*filter->output_function)(0x7e, filter->data)); /* ~ */
223 CK((*filter->output_function)(0x7d, filter->data)); /* '{' */
224 }
225 filter->status &= 0xff;
226 return 0;
227 }
228
mbfl_filt_ident_hz(int c,mbfl_identify_filter * filter)229 static int mbfl_filt_ident_hz(int c, mbfl_identify_filter *filter)
230 {
231 switch (filter->status & 0xf) {
232 /* case 0x00: ASCII */
233 /* case 0x10: GB2312 */
234 case 0:
235 if (c == 0x7e) {
236 filter->status += 2;
237 } else if (filter->status == 0x10 && c > 0x20 && c < 0x7f) { /* DBCS first char */
238 filter->status += 1;
239 } else if (c >= 0 && c < 0x80) { /* latin, CTLs */
240 ;
241 } else {
242 filter->flag = 1; /* bad */
243 }
244 break;
245
246 /* case 0x11: GB2312 second char */
247 case 1:
248 filter->status &= ~0xf;
249 if (c < 0x21 || c > 0x7e) { /* bad */
250 filter->flag = 1;
251 }
252 break;
253
254 case 2:
255 if (c == 0x7d) { /* '}' */
256 filter->status = 0;
257 } else if (c == 0x7b) { /* '{' */
258 filter->status = 0x10;
259 } else if (c == 0x7e) { /* '~' */
260 filter->status = 0;
261 } else {
262 filter->flag = 1; /* bad */
263 filter->status &= ~0xf;
264 }
265 break;
266
267 default:
268 filter->status = 0;
269 break;
270 }
271
272 return c;
273 }
274
