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_kr.c
26 * by moriyoshi koizumi <moriyoshi@php.net> on 4 dec 2002.
27 *
28 */
29
30 /* ISO-2022-KR is defined in RFC 1557
31 * The RFC says that _each_ line which uses KS X 1001 characters must start
32 * with an escape sequence of ESC $ ) C
33 * We don't enforce that for ISO-2022-KR input */
34
35 #include "mbfilter.h"
36 #include "mbfilter_iso2022_kr.h"
37 #include "unicode_table_uhc.h"
38
39 static int mbfl_filt_conv_2022kr_wchar_flush(mbfl_convert_filter *filter);
40 static int mbfl_filt_conv_any_2022kr_flush(mbfl_convert_filter *filter);
41
42 const mbfl_encoding mbfl_encoding_2022kr = {
43 mbfl_no_encoding_2022kr,
44 "ISO-2022-KR",
45 "ISO-2022-KR",
46 NULL,
47 NULL,
48 MBFL_ENCTYPE_GL_UNSAFE,
49 &vtbl_2022kr_wchar,
50 &vtbl_wchar_2022kr,
51 NULL
52 };
53
54 const struct mbfl_convert_vtbl vtbl_wchar_2022kr = {
55 mbfl_no_encoding_wchar,
56 mbfl_no_encoding_2022kr,
57 mbfl_filt_conv_common_ctor,
58 NULL,
59 mbfl_filt_conv_wchar_2022kr,
60 mbfl_filt_conv_any_2022kr_flush,
61 NULL,
62 };
63
64 const struct mbfl_convert_vtbl vtbl_2022kr_wchar = {
65 mbfl_no_encoding_2022kr,
66 mbfl_no_encoding_wchar,
67 mbfl_filt_conv_common_ctor,
68 NULL,
69 mbfl_filt_conv_2022kr_wchar,
70 mbfl_filt_conv_2022kr_wchar_flush,
71 NULL,
72 };
73
74 #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
75
mbfl_filt_conv_2022kr_wchar(int c,mbfl_convert_filter * filter)76 int mbfl_filt_conv_2022kr_wchar(int c, mbfl_convert_filter *filter)
77 {
78 int w = 0;
79
80 switch (filter->status & 0xf) {
81 /* case 0x00: ASCII */
82 /* case 0x10: KSC5601 */
83 case 0:
84 if (c == 0x1b) { /* ESC */
85 filter->status += 2;
86 } else if (c == 0x0f) { /* shift in (ASCII) */
87 filter->status = 0;
88 } else if (c == 0x0e) { /* shift out (KSC5601) */
89 filter->status = 0x10;
90 } else if ((filter->status & 0x10) && c > 0x20 && c < 0x7f) {
91 /* KSC5601 lead byte */
92 filter->cache = c;
93 filter->status = 0x11;
94 } else if ((filter->status & 0x10) == 0 && c >= 0 && c < 0x80) {
95 /* latin, CTLs */
96 CK((*filter->output_function)(c, filter->data));
97 } else {
98 CK((*filter->output_function)(MBFL_BAD_INPUT, filter->data));
99 }
100 break;
101
102 case 1: /* dbcs second byte */
103 filter->status = 0x10;
104 int c1 = filter->cache;
105 int flag = 0;
106
107 if (c1 > 0x20 && c1 < 0x47) {
108 flag = 1;
109 } else if (c1 >= 0x47 && c1 <= 0x7e && c1 != 0x49) {
110 flag = 2;
111 }
112
113 if (flag > 0 && c > 0x20 && c < 0x7f) {
114 if (flag == 1) {
115 if (c1 != 0x22 || c <= 0x65) {
116 w = (c1 - 0x21)*190 + (c - 0x41) + 0x80;
117 if (w >= 0 && w < uhc2_ucs_table_size) {
118 w = uhc2_ucs_table[w];
119 } else {
120 w = 0;
121 }
122 }
123 } else {
124 w = (c1 - 0x47)*94 + (c - 0x21);
125 if (w >= 0 && w < uhc3_ucs_table_size) {
126 w = uhc3_ucs_table[w];
127 } else {
128 w = 0;
129 }
130 }
131
132 if (w <= 0) {
133 w = MBFL_BAD_INPUT;
134 }
135 CK((*filter->output_function)(w, filter->data));
136 } else {
137 CK((*filter->output_function)(MBFL_BAD_INPUT, filter->data));
138 }
139 break;
140
141 case 2: /* ESC */
142 if (c == '$') {
143 filter->status++;
144 } else {
145 filter->status = 0;
146 CK((*filter->output_function)(MBFL_BAD_INPUT, filter->data));
147 }
148 break;
149
150 case 3: /* ESC $ */
151 if (c == ')') {
152 filter->status++;
153 } else {
154 filter->status = 0;
155 CK((*filter->output_function)(MBFL_BAD_INPUT, filter->data));
156 }
157 break;
158
159 case 4: /* ESC $ ) */
160 filter->status = 0;
161 if (c != 'C') {
162 CK((*filter->output_function)(MBFL_BAD_INPUT, filter->data));
163 }
164 break;
165
166 default:
167 filter->status = 0;
168 break;
169 }
170
171 return 0;
172 }
173
mbfl_filt_conv_2022kr_wchar_flush(mbfl_convert_filter * filter)174 static int mbfl_filt_conv_2022kr_wchar_flush(mbfl_convert_filter *filter)
175 {
176 if (filter->status & 0xF) {
177 /* 2-byte character was truncated */
178 CK((*filter->output_function)(MBFL_BAD_INPUT, filter->data));
179 }
180 filter->status = 0;
181
182 if (filter->flush_function) {
183 (*filter->flush_function)(filter->data);
184 }
185
186 return 0;
187 }
188
mbfl_filt_conv_wchar_2022kr(int c,mbfl_convert_filter * filter)189 int mbfl_filt_conv_wchar_2022kr(int c, mbfl_convert_filter *filter)
190 {
191 int c1, c2, s = 0;
192
193 if (c >= ucs_a1_uhc_table_min && c < ucs_a1_uhc_table_max) {
194 s = ucs_a1_uhc_table[c - ucs_a1_uhc_table_min];
195 } else if (c >= ucs_a2_uhc_table_min && c < ucs_a2_uhc_table_max) {
196 s = ucs_a2_uhc_table[c - ucs_a2_uhc_table_min];
197 } else if (c >= ucs_a3_uhc_table_min && c < ucs_a3_uhc_table_max) {
198 s = ucs_a3_uhc_table[c - ucs_a3_uhc_table_min];
199 } else if (c >= ucs_i_uhc_table_min && c < ucs_i_uhc_table_max) {
200 s = ucs_i_uhc_table[c - ucs_i_uhc_table_min];
201 } else if (c >= ucs_s_uhc_table_min && c < ucs_s_uhc_table_max) {
202 s = ucs_s_uhc_table[c - ucs_s_uhc_table_min];
203 } else if (c >= ucs_r1_uhc_table_min && c < ucs_r1_uhc_table_max) {
204 s = ucs_r1_uhc_table[c - ucs_r1_uhc_table_min];
205 } else if (c >= ucs_r2_uhc_table_min && c < ucs_r2_uhc_table_max) {
206 s = ucs_r2_uhc_table[c - ucs_r2_uhc_table_min];
207 }
208
209 c1 = (s >> 8) & 0xff;
210 c2 = s & 0xff;
211 /* exclude UHC extension area */
212 if (c1 < 0xa1 || c2 < 0xa1) {
213 s = c;
214 }
215
216 if (s & 0x8000) {
217 s -= 0x8080;
218 }
219
220 if (s <= 0) {
221 if (c == 0) {
222 s = 0;
223 } else {
224 s = -1;
225 }
226 } else if ((s >= 0x80 && s < 0x2121) || (s > 0x8080)) {
227 s = -1;
228 }
229
230 if (s >= 0) {
231 if (s < 0x80 && s >= 0) { /* ASCII */
232 if (filter->status & 0x10) {
233 CK((*filter->output_function)(0x0f, filter->data)); /* shift in */
234 filter->status &= ~0x10;
235 }
236 CK((*filter->output_function)(s, filter->data));
237 } else {
238 if ((filter->status & 0x100) == 0) {
239 CK((*filter->output_function)(0x1b, filter->data)); /* ESC */
240 CK((*filter->output_function)('$', filter->data));
241 CK((*filter->output_function)(')', filter->data));
242 CK((*filter->output_function)('C', filter->data));
243 filter->status |= 0x100;
244 }
245 if ((filter->status & 0x10) == 0) {
246 CK((*filter->output_function)(0x0e, filter->data)); /* shift out */
247 filter->status |= 0x10;
248 }
249 CK((*filter->output_function)((s >> 8) & 0xff, filter->data));
250 CK((*filter->output_function)(s & 0xff, filter->data));
251 }
252 } else {
253 CK(mbfl_filt_conv_illegal_output(c, filter));
254 }
255
256 return 0;
257 }
258
mbfl_filt_conv_any_2022kr_flush(mbfl_convert_filter * filter)259 static int mbfl_filt_conv_any_2022kr_flush(mbfl_convert_filter *filter)
260 {
261 /* back to ascii */
262 if (filter->status & 0xff00) {
263 CK((*filter->output_function)(0x0f, filter->data)); /* shift in */
264 }
265
266 filter->status = filter->cache = 0;
267
268 if (filter->flush_function) {
269 return (*filter->flush_function)(filter->data);
270 }
271
272 return 0;
273 }
274
