1 /*
2 * linux/fs/isofs/joliet.c
3 *
4 * (C) 1996 Gordon Chaffee
5 *
6 * Joliet: Microsoft's Unicode extensions to iso9660
7 */
8
9 #include <linux/string.h>
10 #include <linux/nls.h>
11 #include <linux/malloc.h>
12 #include <linux/iso_fs.h>
13
14 /*
15 * Convert Unicode 16 to UTF8 or ASCII.
16 */
17 static int
18 uni16_to_x8(unsigned char *ascii, u16 *uni, int len, struct nls_table *nls)
19 {
20 wchar_t *ip;
21 unsigned char *op;
22
23 ip = uni;
24 op = ascii;
25
26 while (*ip && len) {
27 int llen;
28 wchar_t ch = be16_to_cpu(*ip);
29 if ((llen = nls->uni2char(ch, op, NLS_MAX_CHARSET_SIZE)) > 0)
30 op += llen;
31 else
32 *op++ = '?';
33 ip++;
34
35 len--;
36 }
37 *op = 0;
38 return (op - ascii);
39 }
40
41 /* Convert big endian wide character string to utf8 */
42 static int
43 wcsntombs_be(__u8 *s, const __u8 *pwcs, int inlen, int maxlen)
44 {
45 const __u8 *ip;
46 __u8 *op;
47 int size;
48 __u16 c;
49
50 op = s;
51 ip = pwcs;
52 while ((*ip || ip[1]) && (maxlen > 0) && (inlen > 0)) {
53 c = (*ip << 8) | ip[1];
54 if (c > 0x7f) {
55 size = utf8_wctomb(op, c, maxlen);
56 if (size == -1) {
57 /* Ignore character and move on */
58 maxlen--;
59 } else {
60 op += size;
61 maxlen -= size;
62 }
63 } else {
64 *op++ = (__u8) c;
65 }
66 ip += 2;
67 inlen--;
68 }
69 return (op - s);
70 }
71
72 int
73 get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode)
74 {
75 unsigned char utf8;
76 struct nls_table *nls;
77 unsigned char len = 0;
78
79 utf8 = inode->i_sb->u.isofs_sb.s_utf8;
80 nls = inode->i_sb->u.isofs_sb.s_nls_iocharset;
81
82 if (utf8) {
83 len = wcsntombs_be(outname, de->name,
84 de->name_len[0] >> 1, PAGE_SIZE);
85 } else {
86 len = uni16_to_x8(outname, (u16 *) de->name,
87 de->name_len[0] >> 1, nls);
88 }
89 if ((len > 2) && (outname[len-2] == ';') && (outname[len-1] == '1')) {
90 len -= 2;
91 }
92
93 /*
94 * Windows doesn't like periods at the end of a name,
95 * so neither do we
96 */
97 while (len >= 2 && (outname[len-1] == '.')) {
98 len--;
99 }
100
101 return len;
102 }
103
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