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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
23 */
24  
25 /* Specification: RFC 1468 */
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  
36 static int
37 iso2022_jp_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
38 {
39 state_t state = conv->istate;
40 int count = 0;
41 unsigned char c;
42 for (;;) {
43 c = *s;
44 if (c == ESC) {
45 if (n < count+3)
46 goto none;
47 if (s[1] == '(') {
48 if (s[2] == 'B') {
49 state = STATE_ASCII;
50 s += 3; count += 3;
51 if (n < count+1)
52 goto none;
53 continue;
54 }
55 if (s[2] == 'J') {
56 state = STATE_JISX0201ROMAN;
57 s += 3; count += 3;
58 if (n < count+1)
59 goto none;
60 continue;
61 }
62 goto ilseq;
63 }
64 if (s[1] == '$') {
65 if (s[2] == '@' || s[2] == 'B') {
66 /* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */
67 state = STATE_JISX0208;
68 s += 3; count += 3;
69 if (n < count+1)
70 goto none;
71 continue;
72 }
73 goto ilseq;
74 }
75 goto ilseq;
76 }
77 break;
78 }
79 switch (state) {
80 case STATE_ASCII:
81 if (c < 0x80) {
82 int ret = ascii_mbtowc(conv,pwc,s,1);
83 if (ret == RET_ILSEQ)
84 goto ilseq;
85 if (ret != 1) abort();
86 conv->istate = state;
87 return count+1;
88 } else
89 goto ilseq;
90 case STATE_JISX0201ROMAN:
91 if (c < 0x80) {
92 int ret = jisx0201_mbtowc(conv,pwc,s,1);
93 if (ret == RET_ILSEQ)
94 goto ilseq;
95 if (ret != 1) abort();
96 conv->istate = state;
97 return count+1;
98 } else
99 goto ilseq;
100 case STATE_JISX0208:
101 if (n < count+2)
102 goto none;
103 if (s[0] < 0x80 && s[1] < 0x80) {
104 int ret = jisx0208_mbtowc(conv,pwc,s,2);
105 if (ret == RET_ILSEQ)
106 goto ilseq;
107 if (ret != 2) abort();
108 conv->istate = state;
109 return count+2;
110 } else
111 goto ilseq;
112 default: abort();
113 }
114  
115 none:
116 conv->istate = state;
117 return RET_TOOFEW(count);
118  
119 ilseq:
120 conv->istate = state;
121 return RET_SHIFT_ILSEQ(count);
122 }
123  
124 static int
125 iso2022_jp_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
126 {
127 state_t state = conv->ostate;
128 unsigned char buf[2];
129 int ret;
130  
131 /* Try ASCII. */
132 ret = ascii_wctomb(conv,buf,wc,1);
133 if (ret != RET_ILUNI) {
134 if (ret != 1) abort();
135 if (buf[0] < 0x80) {
136 int count = (state == STATE_ASCII ? 1 : 4);
137 if (n < count)
138 return RET_TOOSMALL;
139 if (state != STATE_ASCII) {
140 r[0] = ESC;
141 r[1] = '(';
142 r[2] = 'B';
143 r += 3;
144 state = STATE_ASCII;
145 }
146 r[0] = buf[0];
147 conv->ostate = state;
148 return count;
149 }
150 }
151  
152 /* Try JIS X 0201-1976 Roman. */
153 ret = jisx0201_wctomb(conv,buf,wc,1);
154 if (ret != RET_ILUNI) {
155 if (ret != 1) abort();
156 if (buf[0] < 0x80) {
157 int count = (state == STATE_JISX0201ROMAN ? 1 : 4);
158 if (n < count)
159 return RET_TOOSMALL;
160 if (state != STATE_JISX0201ROMAN) {
161 r[0] = ESC;
162 r[1] = '(';
163 r[2] = 'J';
164 r += 3;
165 state = STATE_JISX0201ROMAN;
166 }
167 r[0] = buf[0];
168 conv->ostate = state;
169 return count;
170 }
171 }
172  
173 /* Try JIS X 0208-1990 in place of JIS X 0208-1978 and JIS X 0208-1983. */
174 ret = jisx0208_wctomb(conv,buf,wc,2);
175 if (ret != RET_ILUNI) {
176 if (ret != 2) abort();
177 if (buf[0] < 0x80 && buf[1] < 0x80) {
178 int count = (state == STATE_JISX0208 ? 2 : 5);
179 if (n < count)
180 return RET_TOOSMALL;
181 if (state != STATE_JISX0208) {
182 r[0] = ESC;
183 r[1] = '$';
184 r[2] = 'B';
185 r += 3;
186 state = STATE_JISX0208;
187 }
188 r[0] = buf[0];
189 r[1] = buf[1];
190 conv->ostate = state;
191 return count;
192 }
193 }
194  
195 return RET_ILUNI;
196 }
197  
198 static int
199 iso2022_jp_reset (conv_t conv, unsigned char *r, int n)
200 {
201 state_t state = conv->ostate;
202 if (state != STATE_ASCII) {
203 if (n < 3)
204 return RET_TOOSMALL;
205 r[0] = ESC;
206 r[1] = '(';
207 r[2] = 'B';
208 /* conv->ostate = 0; will be done by the caller */
209 return 3;
210 } else
211 return 0;
212 }
213  
214 #undef STATE_JISX0208
215 #undef STATE_JISX0201ROMAN
216 #undef STATE_ASCII