1 /*
2 * linux/fs/hfsplus/unicode.c
3 *
4 * Copyright (C) 2001
5 * Brad Boyer (flar@allandria.com)
6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
7 *
8 * Handler routines for unicode strings
9 */
10
11 #include <linux/types.h>
12 #include <linux/nls.h>
13 #include "hfsplus_fs.h"
14 #include "hfsplus_raw.h"
15
16 /* Fold the case of a unicode char, given the 16 bit value */
17 /* Returns folded char, or 0 if ignorable */
case_fold(u16 c)18 static inline u16 case_fold(u16 c)
19 {
20 u16 tmp;
21
22 tmp = case_fold_table[(c>>8)];
23 if (tmp)
24 tmp = case_fold_table[tmp + (c & 0xFF)];
25 else
26 tmp = c;
27 return tmp;
28 }
29
30 /* Compare unicode strings, return values like normal strcmp */
hfsplus_unistrcmp(const hfsplus_unistr * s1,const hfsplus_unistr * s2)31 int hfsplus_unistrcmp(const hfsplus_unistr *s1, const hfsplus_unistr *s2)
32 {
33 u16 len1, len2, c1, c2;
34 const hfsplus_unichr *p1, *p2;
35
36 len1 = be16_to_cpu(s1->length);
37 len2 = be16_to_cpu(s2->length);
38 p1 = s1->unicode;
39 p2 = s2->unicode;
40
41 while (1) {
42 c1 = c2 = 0;
43
44 while (len1 && !c1) {
45 c1 = case_fold(be16_to_cpu(*p1));
46 p1++;
47 len1--;
48 }
49 while (len2 && !c2) {
50 c2 = case_fold(be16_to_cpu(*p2));
51 p2++;
52 len2--;
53 }
54
55 if (c1 != c2)
56 return (c1 < c2) ? -1 : 1;
57 if (!c1 && !c2)
58 return 0;
59 }
60 }
61
hfsplus_uni2asc(const hfsplus_unistr * ustr,char * astr,int * len)62 int hfsplus_uni2asc(const hfsplus_unistr *ustr, char *astr, int *len)
63 {
64 const hfsplus_unichr *ip;
65 u8 *op;
66 u16 ustrlen, cc;
67 int size, tmp;
68
69 op = astr;
70 ip = ustr->unicode;
71 ustrlen = be16_to_cpu(ustr->length);
72 tmp = *len;
73 while (ustrlen > 0 && tmp > 0) {
74 cc = be16_to_cpu(*ip);
75 if (!cc || cc > 0x7f) {
76 size = utf8_wctomb(op, cc ? cc : 0x2400, tmp);
77 if (size == -1) {
78 /* ignore */
79 } else {
80 op += size;
81 tmp -= size;
82 }
83 } else {
84 *op++ = (u8) cc;
85 tmp--;
86 }
87 ip++;
88 ustrlen--;
89 }
90 *len = (char *)op - astr;
91 if (ustrlen)
92 return -ENAMETOOLONG;
93 return 0;
94 }
95
hfsplus_asc2uni(hfsplus_unistr * ustr,const char * astr,int len)96 int hfsplus_asc2uni(hfsplus_unistr *ustr, const char *astr, int len)
97 {
98 int tmp;
99 wchar_t c;
100 u16 outlen = 0;
101
102 while (outlen <= HFSPLUS_MAX_STRLEN && len > 0) {
103 if (*astr & 0x80) {
104 tmp = utf8_mbtowc(&c, astr, len);
105 if (tmp < 0) {
106 astr++;
107 len--;
108 continue;
109 } else {
110 astr += tmp;
111 len -= tmp;
112 }
113 if (c == 0x2400)
114 c = 0;
115 } else {
116 c = *astr++;
117 len--;
118 }
119 ustr->unicode[outlen] = cpu_to_be16(c);
120 outlen++;
121 }
122 ustr->length = cpu_to_be16(outlen);
123 if (len > 0)
124 return -ENAMETOOLONG;
125 return 0;
126 }
127