summaryrefslogtreecommitdiff
path: root/win32/iconv/iso2022_jp.h
blob: a57b2284d357c983ed65a3b123c8bcf3eb669ce4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
/*
 * Copyright (C) 1999-2001 Free Software Foundation, Inc.
 * This file is part of the GNU LIBICONV Library.
 *
 * The GNU LIBICONV Library is free software; you can redistribute it
 * and/or modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * The GNU LIBICONV Library is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
 * If not, write to the Free Software Foundation, Inc., 59 Temple Place -
 * Suite 330, Boston, MA 02111-1307, USA.
 */

/*
 * ISO-2022-JP
 */

/* Specification: RFC 1468 */

#define ESC 0x1b

/*
 * The state can be one of the following values.
 */
#define STATE_ASCII          0
#define STATE_JISX0201ROMAN  1
#define STATE_JISX0208       2

static int
iso2022_jp_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
{
  state_t state = conv->istate;
  int count = 0;
  unsigned char c;
  for (;;) {
    c = *s;
    if (c == ESC) {
      if (n < count+3)
        goto none;
      if (s[1] == '(') {
        if (s[2] == 'B') {
          state = STATE_ASCII;
          s += 3; count += 3;
          if (n < count+1)
            goto none;
          continue;
        }
        if (s[2] == 'J') {
          state = STATE_JISX0201ROMAN;
          s += 3; count += 3;
          if (n < count+1)
            goto none;
          continue;
        }
        return RET_ILSEQ;
      }
      if (s[1] == '$') {
        if (s[2] == '@' || s[2] == 'B') {
          /* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */
          state = STATE_JISX0208;
          s += 3; count += 3;
          if (n < count+1)
            goto none;
          continue;
        }
        return RET_ILSEQ;
      }
      return RET_ILSEQ;
    }
    break;
  }
  switch (state) {
    case STATE_ASCII:
      if (c < 0x80) {
        int ret = ascii_mbtowc(conv,pwc,s,1);
        if (ret == RET_ILSEQ)
          return RET_ILSEQ;
        if (ret != 1) abort();
        conv->istate = state;
        return count+1;
      } else
        return RET_ILSEQ;
    case STATE_JISX0201ROMAN:
      if (c < 0x80) {
        int ret = jisx0201_mbtowc(conv,pwc,s,1);
        if (ret == RET_ILSEQ)
          return RET_ILSEQ;
        if (ret != 1) abort();
        conv->istate = state;
        return count+1;
      } else
        return RET_ILSEQ;
    case STATE_JISX0208:
      if (n < count+2)
        goto none;
      if (s[0] < 0x80 && s[1] < 0x80) {
        int ret = jisx0208_mbtowc(conv,pwc,s,2);
        if (ret == RET_ILSEQ)
          return RET_ILSEQ;
        if (ret != 2) abort();
        conv->istate = state;
        return count+2;
      } else
        return RET_ILSEQ;
    default: abort();
  }

none:
  conv->istate = state;
  return RET_TOOFEW(count);
}

static int
iso2022_jp_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
{
  state_t state = conv->ostate;
  unsigned char buf[2];
  int ret;

  /* Try ASCII. */
  ret = ascii_wctomb(conv,buf,wc,1);
  if (ret != RET_ILUNI) {
    if (ret != 1) abort();
    if (buf[0] < 0x80) {
      int count = (state == STATE_ASCII ? 1 : 4);
      if (n < count)
        return RET_TOOSMALL;
      if (state != STATE_ASCII) {
        r[0] = ESC;
        r[1] = '(';
        r[2] = 'B';
        r += 3;
        state = STATE_ASCII;
      }
      r[0] = buf[0];
      conv->ostate = state;
      return count;
    }
  }

  /* Try JIS X 0201-1976 Roman. */
  ret = jisx0201_wctomb(conv,buf,wc,1);
  if (ret != RET_ILUNI) {
    if (ret != 1) abort();
    if (buf[0] < 0x80) {
      int count = (state == STATE_JISX0201ROMAN ? 1 : 4);
      if (n < count)
        return RET_TOOSMALL;
      if (state != STATE_JISX0201ROMAN) {
        r[0] = ESC;
        r[1] = '(';
        r[2] = 'J';
        r += 3;
        state = STATE_JISX0201ROMAN;
      }
      r[0] = buf[0];
      conv->ostate = state;
      return count;
    }
  }

  /* Try JIS X 0208-1990 in place of JIS X 0208-1978 and JIS X 0208-1983. */
  ret = jisx0208_wctomb(conv,buf,wc,2);
  if (ret != RET_ILUNI) {
    if (ret != 2) abort();
    if (buf[0] < 0x80 && buf[1] < 0x80) {
      int count = (state == STATE_JISX0208 ? 2 : 5);
      if (n < count)
        return RET_TOOSMALL;
      if (state != STATE_JISX0208) {
        r[0] = ESC;
        r[1] = '$';
        r[2] = 'B';
        r += 3;
        state = STATE_JISX0208;
      }
      r[0] = buf[0];
      r[1] = buf[1];
      conv->ostate = state;
      return count;
    }
  }

  return RET_ILUNI;
}

static int
iso2022_jp_reset (conv_t conv, unsigned char *r, int n)
{
  state_t state = conv->ostate;
  if (state != STATE_ASCII) {
    if (n < 3)
      return RET_TOOSMALL;
    r[0] = ESC;
    r[1] = '(';
    r[2] = 'B';
    /* conv->ostate = 0; will be done by the caller */
    return 3;
  } else
    return 0;
}

#undef STATE_JISX0208
#undef STATE_JISX0201ROMAN
#undef STATE_ASCII