1
2#include <linux/module.h>
3#include <linux/kernel.h>
4#include <linux/string.h>
5#include <linux/slab.h>
6#include <linux/parser.h>
7#include <linux/errno.h>
8#include <linux/unicode.h>
9#include <linux/stringhash.h>
10
11#include "utf8n.h"
12
13int utf8_validate(const struct unicode_map *um, const struct qstr *str)
14{
15 const struct utf8data *data = utf8nfdi(um->version);
16
17 if (utf8nlen(data, str->name, str->len) < 0)
18 return -1;
19 return 0;
20}
21EXPORT_SYMBOL(utf8_validate);
22
23int utf8_strncmp(const struct unicode_map *um,
24 const struct qstr *s1, const struct qstr *s2)
25{
26 const struct utf8data *data = utf8nfdi(um->version);
27 struct utf8cursor cur1, cur2;
28 int c1, c2;
29
30 if (utf8ncursor(&cur1, data, s1->name, s1->len) < 0)
31 return -EINVAL;
32
33 if (utf8ncursor(&cur2, data, s2->name, s2->len) < 0)
34 return -EINVAL;
35
36 do {
37 c1 = utf8byte(&cur1);
38 c2 = utf8byte(&cur2);
39
40 if (c1 < 0 || c2 < 0)
41 return -EINVAL;
42 if (c1 != c2)
43 return 1;
44 } while (c1);
45
46 return 0;
47}
48EXPORT_SYMBOL(utf8_strncmp);
49
50int utf8_strncasecmp(const struct unicode_map *um,
51 const struct qstr *s1, const struct qstr *s2)
52{
53 const struct utf8data *data = utf8nfdicf(um->version);
54 struct utf8cursor cur1, cur2;
55 int c1, c2;
56
57 if (utf8ncursor(&cur1, data, s1->name, s1->len) < 0)
58 return -EINVAL;
59
60 if (utf8ncursor(&cur2, data, s2->name, s2->len) < 0)
61 return -EINVAL;
62
63 do {
64 c1 = utf8byte(&cur1);
65 c2 = utf8byte(&cur2);
66
67 if (c1 < 0 || c2 < 0)
68 return -EINVAL;
69 if (c1 != c2)
70 return 1;
71 } while (c1);
72
73 return 0;
74}
75EXPORT_SYMBOL(utf8_strncasecmp);
76
77
78
79
80int utf8_strncasecmp_folded(const struct unicode_map *um,
81 const struct qstr *cf,
82 const struct qstr *s1)
83{
84 const struct utf8data *data = utf8nfdicf(um->version);
85 struct utf8cursor cur1;
86 int c1, c2;
87 int i = 0;
88
89 if (utf8ncursor(&cur1, data, s1->name, s1->len) < 0)
90 return -EINVAL;
91
92 do {
93 c1 = utf8byte(&cur1);
94 c2 = cf->name[i++];
95 if (c1 < 0)
96 return -EINVAL;
97 if (c1 != c2)
98 return 1;
99 } while (c1);
100
101 return 0;
102}
103EXPORT_SYMBOL(utf8_strncasecmp_folded);
104
105int utf8_casefold(const struct unicode_map *um, const struct qstr *str,
106 unsigned char *dest, size_t dlen)
107{
108 const struct utf8data *data = utf8nfdicf(um->version);
109 struct utf8cursor cur;
110 size_t nlen = 0;
111
112 if (utf8ncursor(&cur, data, str->name, str->len) < 0)
113 return -EINVAL;
114
115 for (nlen = 0; nlen < dlen; nlen++) {
116 int c = utf8byte(&cur);
117
118 dest[nlen] = c;
119 if (!c)
120 return nlen;
121 if (c == -1)
122 break;
123 }
124 return -EINVAL;
125}
126EXPORT_SYMBOL(utf8_casefold);
127
128int utf8_casefold_hash(const struct unicode_map *um, const void *salt,
129 struct qstr *str)
130{
131 const struct utf8data *data = utf8nfdicf(um->version);
132 struct utf8cursor cur;
133 int c;
134 unsigned long hash = init_name_hash(salt);
135
136 if (utf8ncursor(&cur, data, str->name, str->len) < 0)
137 return -EINVAL;
138
139 while ((c = utf8byte(&cur))) {
140 if (c < 0)
141 return -EINVAL;
142 hash = partial_name_hash((unsigned char)c, hash);
143 }
144 str->hash = end_name_hash(hash);
145 return 0;
146}
147EXPORT_SYMBOL(utf8_casefold_hash);
148
149int utf8_normalize(const struct unicode_map *um, const struct qstr *str,
150 unsigned char *dest, size_t dlen)
151{
152 const struct utf8data *data = utf8nfdi(um->version);
153 struct utf8cursor cur;
154 ssize_t nlen = 0;
155
156 if (utf8ncursor(&cur, data, str->name, str->len) < 0)
157 return -EINVAL;
158
159 for (nlen = 0; nlen < dlen; nlen++) {
160 int c = utf8byte(&cur);
161
162 dest[nlen] = c;
163 if (!c)
164 return nlen;
165 if (c == -1)
166 break;
167 }
168 return -EINVAL;
169}
170
171EXPORT_SYMBOL(utf8_normalize);
172
173static int utf8_parse_version(const char *version, unsigned int *maj,
174 unsigned int *min, unsigned int *rev)
175{
176 substring_t args[3];
177 char version_string[12];
178 static const struct match_token token[] = {
179 {1, "%d.%d.%d"},
180 {0, NULL}
181 };
182
183 strncpy(version_string, version, sizeof(version_string));
184
185 if (match_token(version_string, token, args) != 1)
186 return -EINVAL;
187
188 if (match_int(&args[0], maj) || match_int(&args[1], min) ||
189 match_int(&args[2], rev))
190 return -EINVAL;
191
192 return 0;
193}
194
195struct unicode_map *utf8_load(const char *version)
196{
197 struct unicode_map *um = NULL;
198 int unicode_version;
199
200 if (version) {
201 unsigned int maj, min, rev;
202
203 if (utf8_parse_version(version, &maj, &min, &rev) < 0)
204 return ERR_PTR(-EINVAL);
205
206 if (!utf8version_is_supported(maj, min, rev))
207 return ERR_PTR(-EINVAL);
208
209 unicode_version = UNICODE_AGE(maj, min, rev);
210 } else {
211 unicode_version = utf8version_latest();
212 printk(KERN_WARNING"UTF-8 version not specified. "
213 "Assuming latest supported version (%d.%d.%d).",
214 (unicode_version >> 16) & 0xff,
215 (unicode_version >> 8) & 0xff,
216 (unicode_version & 0xff));
217 }
218
219 um = kzalloc(sizeof(struct unicode_map), GFP_KERNEL);
220 if (!um)
221 return ERR_PTR(-ENOMEM);
222
223 um->charset = "UTF-8";
224 um->version = unicode_version;
225
226 return um;
227}
228EXPORT_SYMBOL(utf8_load);
229
230void utf8_unload(struct unicode_map *um)
231{
232 kfree(um);
233}
234EXPORT_SYMBOL(utf8_unload);
235
236MODULE_LICENSE("GPL v2");
237
