Coverage Report

Created: 2025-01-28 06:58

/src/libidn2/lib/context.c
Line
Count
Source (jump to first uncovered line)
1
/* context.c - check contextual rule on label
2
   Copyright (C) 2011-2024 Simon Josefsson
3
4
   Libidn2 is free software: you can redistribute it and/or modify it
5
   under the terms of either:
6
7
     * the GNU Lesser General Public License as published by the Free
8
       Software Foundation; either version 3 of the License, or (at
9
       your option) any later version.
10
11
   or
12
13
     * the GNU General Public License as published by the Free
14
       Software Foundation; either version 2 of the License, or (at
15
       your option) any later version.
16
17
   or both in parallel, as here.
18
19
   This program is distributed in the hope that it will be useful,
20
   but WITHOUT ANY WARRANTY; without even the implied warranty of
21
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22
   GNU General Public License for more details.
23
24
   You should have received copies of the GNU General Public License and
25
   the GNU Lesser General Public License along with this program.  If
26
   not, see <http://www.gnu.org/licenses/>.
27
*/
28
29
#include <config.h>
30
31
#include "idn2.h"
32
#include "tables.h"
33
#include <unictype.h>   /* uc_combining_class, UC_CCC_VR */
34
#include "context.h"
35
36
int
37
_idn2_contextj_rule (const uint32_t *label, size_t llen, size_t pos)
38
167k
{
39
167k
  uint32_t cp;
40
41
167k
  if (llen == 0)
42
0
    return IDN2_OK;
43
44
167k
  cp = label[pos];
45
46
167k
  if (!_idn2_contextj_p (cp))
47
161k
    return IDN2_OK;
48
49
6.68k
  switch (cp)
50
6.68k
    {
51
5.00k
    case 0x200C:    /* ZERO WIDTH NON-JOINER */
52
5.00k
      if (pos > 0)
53
4.55k
  {
54
    /* If Canonical_Combining_Class(Before(cp)) .eq.  Virama Then True; */
55
4.55k
    uint32_t before_cp = label[pos - 1];
56
4.55k
    int cc = uc_combining_class (before_cp);
57
4.55k
    if (cc == UC_CCC_VR)
58
621
      return IDN2_OK;
59
4.55k
  }
60
61
      /* See http://permalink.gmane.org/gmane.ietf.idnabis/6980 for
62
         clarified rule. */
63
64
4.37k
      if (pos == 0 || pos == llen - 1)
65
986
  return IDN2_CONTEXTJ;
66
67
3.39k
      {
68
3.39k
  int jt;
69
3.39k
  size_t tmp;
70
71
  /* Search backwards. */
72
3.39k
  for (tmp = pos - 1;; tmp--)
73
4.91k
    {
74
4.91k
      jt = uc_joining_type (label[tmp]);
75
4.91k
      if (jt == UC_JOINING_TYPE_L || jt == UC_JOINING_TYPE_D)
76
1.97k
        break;
77
2.94k
      if (tmp == 0)
78
971
        return IDN2_CONTEXTJ;
79
1.97k
      if (jt == UC_JOINING_TYPE_T)
80
1.52k
        continue;
81
447
      return IDN2_CONTEXTJ;
82
1.97k
    }
83
84
  /* Search forward. */
85
2.97k
  for (tmp = pos + 1; tmp < llen; tmp++)
86
2.97k
    {
87
2.97k
      jt = uc_joining_type (label[tmp]);
88
2.97k
      if (jt == UC_JOINING_TYPE_R || jt == UC_JOINING_TYPE_D)
89
1.36k
        break;
90
1.61k
      if (tmp == llen - 1)
91
594
        return IDN2_CONTEXTJ;
92
1.02k
      if (jt == UC_JOINING_TYPE_T)
93
1.00k
        continue;
94
20
      return IDN2_CONTEXTJ;
95
1.02k
    }
96
1.97k
      }
97
98
1.36k
      return IDN2_OK;
99
0
      break;
100
101
1.68k
    case 0x200D:    /* ZERO WIDTH JOINER */
102
1.68k
      if (pos > 0)
103
1.13k
  {
104
1.13k
    uint32_t before_cp = label[pos - 1];
105
1.13k
    int cc = uc_combining_class (before_cp);
106
1.13k
    if (cc == UC_CCC_VR)
107
647
      return IDN2_OK;
108
1.13k
  }
109
1.03k
      return IDN2_CONTEXTJ;
110
6.68k
    }
111
112
0
  return IDN2_CONTEXTJ_NO_RULE;
113
6.68k
}
114
115
static const char *
116
_uc_script_name (ucs4_t uc)
117
0
{
118
0
  const uc_script_t *ucs = uc_script (uc);
119
120
0
  if (!ucs)
121
0
    return "";
122
123
0
  return ucs->name;
124
0
}
125
126
int
127
_idn2_contexto_rule (const uint32_t *label, size_t llen, size_t pos)
128
0
{
129
0
  uint32_t cp = label[pos];
130
131
0
  if (!_idn2_contexto_p (cp))
132
0
    return IDN2_OK;
133
134
0
  switch (cp)
135
0
    {
136
0
    case 0x00B7:
137
      /* MIDDLE DOT */
138
0
      if (llen < 3)
139
0
  return IDN2_CONTEXTO;
140
0
      if (pos == 0 || pos == llen - 1)
141
0
  return IDN2_CONTEXTO;
142
0
      if (label[pos - 1] == 0x006C && label[pos + 1] == 0x006C)
143
0
  return IDN2_OK;
144
0
      return IDN2_CONTEXTO;
145
0
      break;
146
147
0
    case 0x0375:
148
      /* GREEK LOWER NUMERAL SIGN (KERAIA) */
149
0
      if (pos == llen - 1)
150
0
  return IDN2_CONTEXTO;
151
0
      if (strcmp (_uc_script_name (label[pos + 1]), "Greek") == 0)
152
0
  return IDN2_OK;
153
0
      return IDN2_CONTEXTO;
154
0
      break;
155
156
0
    case 0x05F3:
157
      /* HEBREW PUNCTUATION GERESH */
158
0
    case 0x05F4:
159
      /* HEBREW PUNCTUATION GERSHAYIM */
160
0
      if (pos == 0)
161
0
  return IDN2_CONTEXTO;
162
0
      if (strcmp (_uc_script_name (label[pos - 1]), "Hebrew") == 0)
163
0
  return IDN2_OK;
164
0
      return IDN2_CONTEXTO;
165
0
      break;
166
167
0
    case 0x0660:
168
0
    case 0x0661:
169
0
    case 0x0662:
170
0
    case 0x0663:
171
0
    case 0x0664:
172
0
    case 0x0665:
173
0
    case 0x0666:
174
0
    case 0x0667:
175
0
    case 0x0668:
176
0
    case 0x0669:
177
0
      {
178
  /* ARABIC-INDIC DIGITS */
179
0
  size_t i;
180
0
  for (i = 0; i < llen; i++)
181
0
    if (label[i] >= 0x6F0 && label[i] <= 0x06F9)
182
0
      return IDN2_CONTEXTO;
183
0
  return IDN2_OK;
184
0
  break;
185
0
      }
186
187
0
    case 0x06F0:
188
0
    case 0x06F1:
189
0
    case 0x06F2:
190
0
    case 0x06F3:
191
0
    case 0x06F4:
192
0
    case 0x06F5:
193
0
    case 0x06F6:
194
0
    case 0x06F7:
195
0
    case 0x06F8:
196
0
    case 0x06F9:
197
0
      {
198
  /* EXTENDED ARABIC-INDIC DIGITS */
199
0
  size_t i;
200
0
  for (i = 0; i < llen; i++)
201
0
    if (label[i] >= 0x660 && label[i] <= 0x0669)
202
0
      return IDN2_CONTEXTO;
203
0
  return IDN2_OK;
204
0
  break;
205
0
      }
206
0
    case 0x30FB:
207
0
      {
208
  /* KATAKANA MIDDLE DOT */
209
0
  size_t i;
210
0
  bool script_ok = false;
211
212
0
  for (i = 0; !script_ok && i < llen; i++)
213
0
    if (strcmp (_uc_script_name (label[i]), "Hiragana") == 0
214
0
        || strcmp (_uc_script_name (label[i]), "Katakana") == 0
215
0
        || strcmp (_uc_script_name (label[i]), "Han") == 0)
216
0
      script_ok = true;
217
218
0
  if (script_ok)
219
0
    return IDN2_OK;
220
0
  return IDN2_CONTEXTO;
221
0
  break;
222
0
      }
223
0
    }
224
225
0
  return IDN2_CONTEXTO_NO_RULE;
226
0
}
227
228
bool
229
_idn2_contexto_with_rule (uint32_t cp)
230
21.5k
{
231
21.5k
  switch (cp)
232
21.5k
    {
233
2.05k
    case 0x00B7:
234
      /* MIDDLE DOT */
235
2.93k
    case 0x0375:
236
      /* GREEK LOWER NUMERAL SIGN (KERAIA) */
237
3.77k
    case 0x05F3:
238
      /* HEBREW PUNCTUATION GERESH */
239
4.39k
    case 0x05F4:
240
      /* HEBREW PUNCTUATION GERSHAYIM */
241
5.23k
    case 0x0660:
242
5.85k
    case 0x0661:
243
6.78k
    case 0x0662:
244
7.49k
    case 0x0663:
245
8.21k
    case 0x0664:
246
8.90k
    case 0x0665:
247
10.4k
    case 0x0666:
248
11.3k
    case 0x0667:
249
12.0k
    case 0x0668:
250
12.6k
    case 0x0669:
251
      /* ARABIC-INDIC DIGITS */
252
13.4k
    case 0x06F0:
253
14.1k
    case 0x06F1:
254
15.0k
    case 0x06F2:
255
15.9k
    case 0x06F3:
256
16.7k
    case 0x06F4:
257
17.5k
    case 0x06F5:
258
18.2k
    case 0x06F6:
259
18.9k
    case 0x06F7:
260
19.6k
    case 0x06F8:
261
20.3k
    case 0x06F9:
262
      /* EXTENDED ARABIC-INDIC DIGITS */
263
21.5k
    case 0x30FB:
264
      /* KATAKANA MIDDLE DOT */
265
21.5k
      return true;
266
0
      break;
267
21.5k
    }
268
269
0
  return false;
270
21.5k
}