2 * linux/fs/hfsplus/unicode.c
5 * Brad Boyer (flar@allandria.com)
6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
8 * Handler routines for unicode strings
11 #include <linux/types.h>
12 #include <linux/nls.h>
13 #include "hfsplus_fs.h"
14 #include "hfsplus_raw.h"
16 /* Fold the case of a unicode char, given the 16 bit value */
17 /* Returns folded char, or 0 if ignorable */
18 static inline u16 case_fold(u16 c)
22 tmp = case_fold_table[(c>>8)];
24 tmp = case_fold_table[tmp + (c & 0xFF)];
30 /* Compare unicode strings, return values like normal strcmp */
31 int hfsplus_unistrcmp(const struct hfsplus_unistr *s1, const struct hfsplus_unistr *s2)
33 u16 len1, len2, c1, c2;
34 const hfsplus_unichr *p1, *p2;
36 len1 = be16_to_cpu(s1->length);
37 len2 = be16_to_cpu(s2->length);
45 c1 = case_fold(be16_to_cpu(*p1));
50 c2 = case_fold(be16_to_cpu(*p2));
56 return (c1 < c2) ? -1 : 1;
62 int hfsplus_uni2asc(const struct hfsplus_unistr *ustr, char *astr, int *len)
64 const hfsplus_unichr *ip;
71 ustrlen = be16_to_cpu(ustr->length);
73 while (ustrlen > 0 && tmp > 0) {
74 cc = be16_to_cpu(*ip);
84 size = utf8_wctomb(op, cc, tmp);
98 *len = (char *)op - astr;
100 return -ENAMETOOLONG;
104 int hfsplus_asc2uni(struct hfsplus_unistr *ustr, const char *astr, int len)
110 while (outlen <= HFSPLUS_MAX_STRLEN && len > 0) {
112 tmp = utf8_mbtowc(&c, astr, len);
133 ustr->unicode[outlen] = cpu_to_be16(c);
136 ustr->length = cpu_to_be16(outlen);
138 return -ENAMETOOLONG;