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1 office 1 /*
2 * Copyright (C) 1999-2001, 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 * ISO-2022-JP-1
23 */
24  
25 /* Specification: RFC 2237 */
26  
27 #define ESC 0x1b
28  
29 /*
30 * The state can be one of the following values.
31 */
32 #define STATE_ASCII 0
33 #define STATE_JISX0201ROMAN 1
34 #define STATE_JISX0208 2
35 #define STATE_JISX0212 3
36  
37 static int
38 iso2022_jp1_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
39 {
40 state_t state = conv->istate;
41 int count = 0;
42 unsigned char c;
43 for (;;) {
44 c = *s;
45 if (c == ESC) {
46 if (n < count+3)
47 goto none;
48 if (s[1] == '(') {
49 if (s[2] == 'B') {
50 state = STATE_ASCII;
51 s += 3; count += 3;
52 if (n < count+1)
53 goto none;
54 continue;
55 }
56 if (s[2] == 'J') {
57 state = STATE_JISX0201ROMAN;
58 s += 3; count += 3;
59 if (n < count+1)
60 goto none;
61 continue;
62 }
63 goto ilseq;
64 }
65 if (s[1] == '$') {
66 if (s[2] == '@' || s[2] == 'B') {
67 /* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */
68 state = STATE_JISX0208;
69 s += 3; count += 3;
70 if (n < count+1)
71 goto none;
72 continue;
73 }
74 if (s[2] == '(') {
75 if (n < count+4)
76 goto none;
77 if (s[3] == 'D') {
78 state = STATE_JISX0212;
79 s += 4; count += 4;
80 if (n < count+1)
81 goto none;
82 continue;
83 }
84 }
85 goto ilseq;
86 }
87 goto ilseq;
88 }
89 break;
90 }
91 switch (state) {
92 case STATE_ASCII:
93 if (c < 0x80) {
94 int ret = ascii_mbtowc(conv,pwc,s,1);
95 if (ret == RET_ILSEQ)
96 goto ilseq;
97 if (ret != 1) abort();
98 conv->istate = state;
99 return count+1;
100 } else
101 goto ilseq;
102 case STATE_JISX0201ROMAN:
103 if (c < 0x80) {
104 int ret = jisx0201_mbtowc(conv,pwc,s,1);
105 if (ret == RET_ILSEQ)
106 goto ilseq;
107 if (ret != 1) abort();
108 conv->istate = state;
109 return count+1;
110 } else
111 goto ilseq;
112 case STATE_JISX0208:
113 if (n < count+2)
114 goto none;
115 if (s[0] < 0x80 && s[1] < 0x80) {
116 int ret = jisx0208_mbtowc(conv,pwc,s,2);
117 if (ret == RET_ILSEQ)
118 goto ilseq;
119 if (ret != 2) abort();
120 conv->istate = state;
121 return count+2;
122 } else
123 goto ilseq;
124 case STATE_JISX0212:
125 if (n < count+2)
126 goto none;
127 if (s[0] < 0x80 && s[1] < 0x80) {
128 int ret = jisx0212_mbtowc(conv,pwc,s,2);
129 if (ret == RET_ILSEQ)
130 goto ilseq;
131 if (ret != 2) abort();
132 conv->istate = state;
133 return count+2;
134 } else
135 goto ilseq;
136 default: abort();
137 }
138  
139 none:
140 conv->istate = state;
141 return RET_TOOFEW(count);
142  
143 ilseq:
144 conv->istate = state;
145 return RET_SHIFT_ILSEQ(count);
146 }
147  
148 static int
149 iso2022_jp1_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
150 {
151 state_t state = conv->ostate;
152 unsigned char buf[2];
153 int ret;
154  
155 /* Try ASCII. */
156 ret = ascii_wctomb(conv,buf,wc,1);
157 if (ret != RET_ILUNI) {
158 if (ret != 1) abort();
159 if (buf[0] < 0x80) {
160 int count = (state == STATE_ASCII ? 1 : 4);
161 if (n < count)
162 return RET_TOOSMALL;
163 if (state != STATE_ASCII) {
164 r[0] = ESC;
165 r[1] = '(';
166 r[2] = 'B';
167 r += 3;
168 state = STATE_ASCII;
169 }
170 r[0] = buf[0];
171 conv->ostate = state;
172 return count;
173 }
174 }
175  
176 /* Try JIS X 0201-1976 Roman. */
177 ret = jisx0201_wctomb(conv,buf,wc,1);
178 if (ret != RET_ILUNI) {
179 if (ret != 1) abort();
180 if (buf[0] < 0x80) {
181 int count = (state == STATE_JISX0201ROMAN ? 1 : 4);
182 if (n < count)
183 return RET_TOOSMALL;
184 if (state != STATE_JISX0201ROMAN) {
185 r[0] = ESC;
186 r[1] = '(';
187 r[2] = 'J';
188 r += 3;
189 state = STATE_JISX0201ROMAN;
190 }
191 r[0] = buf[0];
192 conv->ostate = state;
193 return count;
194 }
195 }
196  
197 /* Try JIS X 0208-1990 in place of JIS X 0208-1978 and JIS X 0208-1983. */
198 ret = jisx0208_wctomb(conv,buf,wc,2);
199 if (ret != RET_ILUNI) {
200 if (ret != 2) abort();
201 if (buf[0] < 0x80 && buf[1] < 0x80) {
202 int count = (state == STATE_JISX0208 ? 2 : 5);
203 if (n < count)
204 return RET_TOOSMALL;
205 if (state != STATE_JISX0208) {
206 r[0] = ESC;
207 r[1] = '$';
208 r[2] = 'B';
209 r += 3;
210 state = STATE_JISX0208;
211 }
212 r[0] = buf[0];
213 r[1] = buf[1];
214 conv->ostate = state;
215 return count;
216 }
217 }
218  
219 /* Try JIS X 0212-1990. */
220 ret = jisx0212_wctomb(conv,buf,wc,2);
221 if (ret != RET_ILUNI) {
222 if (ret != 2) abort();
223 if (buf[0] < 0x80 && buf[1] < 0x80) {
224 int count = (state == STATE_JISX0212 ? 2 : 6);
225 if (n < count)
226 return RET_TOOSMALL;
227 if (state != STATE_JISX0212) {
228 r[0] = ESC;
229 r[1] = '$';
230 r[2] = '(';
231 r[3] = 'D';
232 r += 4;
233 state = STATE_JISX0212;
234 }
235 r[0] = buf[0];
236 r[1] = buf[1];
237 conv->ostate = state;
238 return count;
239 }
240 }
241  
242 return RET_ILUNI;
243 }
244  
245 static int
246 iso2022_jp1_reset (conv_t conv, unsigned char *r, int n)
247 {
248 state_t state = conv->ostate;
249 if (state != STATE_ASCII) {
250 if (n < 3)
251 return RET_TOOSMALL;
252 r[0] = ESC;
253 r[1] = '(';
254 r[2] = 'B';
255 /* conv->ostate = 0; will be done by the caller */
256 return 3;
257 } else
258 return 0;
259 }
260  
261 #undef STATE_JISX0212
262 #undef STATE_JISX0208
263 #undef STATE_JISX0201ROMAN
264 #undef STATE_ASCII