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
|
/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/parser.h>
#include <linux/errno.h>
#include <linux/unicode.h>
#include <linux/stringhash.h>
#include "utf8n.h"
int utf8_validate(const struct unicode_map *um, const struct qstr *str)
{
const struct utf8data *data = utf8nfdi(um->version);
if (utf8nlen(data, str->name, str->len) < 0)
return -1;
return 0;
}
EXPORT_SYMBOL(utf8_validate);
int utf8_strncmp(const struct unicode_map *um,
const struct qstr *s1, const struct qstr *s2)
{
const struct utf8data *data = utf8nfdi(um->version);
struct utf8cursor cur1, cur2;
int c1, c2;
if (utf8ncursor(&cur1, data, s1->name, s1->len) < 0)
return -EINVAL;
if (utf8ncursor(&cur2, data, s2->name, s2->len) < 0)
return -EINVAL;
do {
c1 = utf8byte(&cur1);
c2 = utf8byte(&cur2);
if (c1 < 0 || c2 < 0)
return -EINVAL;
if (c1 != c2)
return 1;
} while (c1);
return 0;
}
EXPORT_SYMBOL(utf8_strncmp);
int utf8_strncasecmp(const struct unicode_map *um,
const struct qstr *s1, const struct qstr *s2)
{
const struct utf8data *data = utf8nfdicf(um->version);
struct utf8cursor cur1, cur2;
int c1, c2;
if (utf8ncursor(&cur1, data, s1->name, s1->len) < 0)
return -EINVAL;
if (utf8ncursor(&cur2, data, s2->name, s2->len) < 0)
return -EINVAL;
do {
c1 = utf8byte(&cur1);
c2 = utf8byte(&cur2);
if (c1 < 0 || c2 < 0)
return -EINVAL;
if (c1 != c2)
return 1;
} while (c1);
return 0;
}
EXPORT_SYMBOL(utf8_strncasecmp);
/* String cf is expected to be a valid UTF-8 casefolded
* string.
*/
int utf8_strncasecmp_folded(const struct unicode_map *um,
const struct qstr *cf,
const struct qstr *s1)
{
const struct utf8data *data = utf8nfdicf(um->version);
struct utf8cursor cur1;
int c1, c2;
int i = 0;
if (utf8ncursor(&cur1, data, s1->name, s1->len) < 0)
return -EINVAL;
do {
c1 = utf8byte(&cur1);
c2 = cf->name[i++];
if (c1 < 0)
return -EINVAL;
if (c1 != c2)
return 1;
} while (c1);
return 0;
}
EXPORT_SYMBOL(utf8_strncasecmp_folded);
int utf8_casefold(const struct unicode_map *um, const struct qstr *str,
unsigned char *dest, size_t dlen)
{
const struct utf8data *data = utf8nfdicf(um->version);
struct utf8cursor cur;
size_t nlen = 0;
if (utf8ncursor(&cur, data, str->name, str->len) < 0)
return -EINVAL;
for (nlen = 0; nlen < dlen; nlen++) {
int c = utf8byte(&cur);
dest[nlen] = c;
if (!c)
return nlen;
if (c == -1)
break;
}
return -EINVAL;
}
EXPORT_SYMBOL(utf8_casefold);
int utf8_casefold_hash(const struct unicode_map *um, const void *salt,
struct qstr *str)
{
const struct utf8data *data = utf8nfdicf(um->version);
struct utf8cursor cur;
int c;
unsigned long hash = init_name_hash(salt);
if (utf8ncursor(&cur, data, str->name, str->len) < 0)
return -EINVAL;
while ((c = utf8byte(&cur))) {
if (c < 0)
return -EINVAL;
hash = partial_name_hash((unsigned char)c, hash);
}
str->hash = end_name_hash(hash);
return 0;
}
EXPORT_SYMBOL(utf8_casefold_hash);
int utf8_normalize(const struct unicode_map *um, const struct qstr *str,
unsigned char *dest, size_t dlen)
{
const struct utf8data *data = utf8nfdi(um->version);
struct utf8cursor cur;
ssize_t nlen = 0;
if (utf8ncursor(&cur, data, str->name, str->len) < 0)
return -EINVAL;
for (nlen = 0; nlen < dlen; nlen++) {
int c = utf8byte(&cur);
dest[nlen] = c;
if (!c)
return nlen;
if (c == -1)
break;
}
return -EINVAL;
}
EXPORT_SYMBOL(utf8_normalize);
struct unicode_map *utf8_load(unsigned int version)
{
struct unicode_map *um;
if (!utf8version_is_supported(version))
return ERR_PTR(-EINVAL);
um = kzalloc(sizeof(struct unicode_map), GFP_KERNEL);
if (!um)
return ERR_PTR(-ENOMEM);
um->version = version;
return um;
}
EXPORT_SYMBOL(utf8_load);
void utf8_unload(struct unicode_map *um)
{
kfree(um);
}
EXPORT_SYMBOL(utf8_unload);
MODULE_LICENSE("GPL v2");
|
