diff options
Diffstat (limited to 'fs/unicode/utf8-core.c')
| -rw-r--r-- | fs/unicode/utf8-core.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/fs/unicode/utf8-core.c b/fs/unicode/utf8-core.c new file mode 100644 index 000000000..dc25823bf --- /dev/null +++ b/fs/unicode/utf8-core.c @@ -0,0 +1,236 @@ +/* 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); + +static int utf8_parse_version(const char *version, unsigned int *maj, + unsigned int *min, unsigned int *rev) +{ + substring_t args[3]; + char version_string[12]; + static const struct match_token token[] = { + {1, "%d.%d.%d"}, + {0, NULL} + }; + + strncpy(version_string, version, sizeof(version_string)); + + if (match_token(version_string, token, args) != 1) + return -EINVAL; + + if (match_int(&args[0], maj) || match_int(&args[1], min) || + match_int(&args[2], rev)) + return -EINVAL; + + return 0; +} + +struct unicode_map *utf8_load(const char *version) +{ + struct unicode_map *um = NULL; + int unicode_version; + + if (version) { + unsigned int maj, min, rev; + + if (utf8_parse_version(version, &maj, &min, &rev) < 0) + return ERR_PTR(-EINVAL); + + if (!utf8version_is_supported(maj, min, rev)) + return ERR_PTR(-EINVAL); + + unicode_version = UNICODE_AGE(maj, min, rev); + } else { + unicode_version = utf8version_latest(); + printk(KERN_WARNING"UTF-8 version not specified. " + "Assuming latest supported version (%d.%d.%d).", + (unicode_version >> 16) & 0xff, + (unicode_version >> 8) & 0xff, + (unicode_version & 0xff)); + } + + um = kzalloc(sizeof(struct unicode_map), GFP_KERNEL); + if (!um) + return ERR_PTR(-ENOMEM); + + um->charset = "UTF-8"; + um->version = unicode_version; + + return um; +} +EXPORT_SYMBOL(utf8_load); + +void utf8_unload(struct unicode_map *um) +{ + kfree(um); +} +EXPORT_SYMBOL(utf8_unload); + +MODULE_LICENSE("GPL v2"); |