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 */
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 */
31 int hfsplus_unistrcmp(const struct hfsplus_unistr *s1, const struct 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
62 int hfsplus_uni2asc(const struct 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 switch (cc) {
76 case 0:
77 cc = 0x2400;
78 break;
79 case '/':
80 cc = ':';
81 break;
82 }
83 if (cc > 0x7f) {
84 size = utf8_wctomb(op, cc, tmp);
85 if (size == -1) {
86 /* ignore */
87 } else {
88 op += size;
89 tmp -= size;
90 }
91 } else {
92 *op++ = (u8) cc;
93 tmp--;
94 }
95 ip++;
96 ustrlen--;
97 }
98 *len = (char *)op - astr;
99 if (ustrlen)
100 return -ENAMETOOLONG;
101 return 0;
102 }
103
104 int hfsplus_asc2uni(struct hfsplus_unistr *ustr, const char *astr, int len)
105 {
106 int tmp;
107 wchar_t c;
108 u16 outlen = 0;
109
110 while (outlen <= HFSPLUS_MAX_STRLEN && len > 0) {
111 if (*astr & 0x80) {
112 tmp = utf8_mbtowc(&c, astr, len);
113 if (tmp < 0) {
114 astr++;
115 len--;
116 continue;
117 } else {
118 astr += tmp;
119 len -= tmp;
120 }
121 } else {
122 c = *astr++;
123 len--;
124 }
125 switch (c) {
126 case 0x2400:
127 c = 0;
128 break;
129 case ':':
130 c = '/';
131 break;
132 }
133 ustr->unicode[outlen] = cpu_to_be16(c);
134 outlen++;
135 }
136 ustr->length = cpu_to_be16(outlen);
137 if (len > 0)
138 return -ENAMETOOLONG;
139 return 0;
140 }
141
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