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/slab.h>
12 #include <linux/iso_fs.h>
13 #include <asm/unaligned.h>
14
15 /*
16 * Convert Unicode 16 to UTF8 or ASCII.
17 */
18 static int
uni16_to_x8(unsigned char * ascii,u16 * uni,int len,struct nls_table * nls)19 uni16_to_x8(unsigned char *ascii, u16 *uni, int len, struct nls_table *nls)
20 {
21 wchar_t *ip, ch;
22 unsigned char *op;
23
24 ip = uni;
25 op = ascii;
26
27 while ((ch = get_unaligned(ip)) && len) {
28 int llen;
29 ch = be16_to_cpu(ch);
30 if ((llen = nls->uni2char(ch, op, NLS_MAX_CHARSET_SIZE)) > 0)
31 op += llen;
32 else
33 *op++ = '?';
34 ip++;
35
36 len--;
37 }
38 *op = 0;
39 return (op - ascii);
40 }
41
42 /* Convert big endian wide character string to utf8 */
43 static int
wcsntombs_be(__u8 * s,const __u8 * pwcs,int inlen,int maxlen)44 wcsntombs_be(__u8 *s, const __u8 *pwcs, int inlen, int maxlen)
45 {
46 const __u8 *ip;
47 __u8 *op;
48 int size;
49 __u16 c;
50
51 op = s;
52 ip = pwcs;
53 while ((*ip || ip[1]) && (maxlen > 0) && (inlen > 0)) {
54 c = (*ip << 8) | ip[1];
55 if (c > 0x7f) {
56 size = utf8_wctomb(op, c, maxlen);
57 if (size == -1) {
58 /* Ignore character and move on */
59 maxlen--;
60 } else {
61 op += size;
62 maxlen -= size;
63 }
64 } else {
65 *op++ = (__u8) c;
66 }
67 ip += 2;
68 inlen--;
69 }
70 return (op - s);
71 }
72
73 int
get_joliet_filename(struct iso_directory_record * de,unsigned char * outname,struct inode * inode)74 get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode)
75 {
76 unsigned char utf8;
77 struct nls_table *nls;
78 unsigned char len = 0;
79
80 utf8 = inode->i_sb->u.isofs_sb.s_utf8;
81 nls = inode->i_sb->u.isofs_sb.s_nls_iocharset;
82
83 if (utf8) {
84 len = wcsntombs_be(outname, de->name,
85 de->name_len[0] >> 1, PAGE_SIZE);
86 } else {
87 len = uni16_to_x8(outname, (u16 *) de->name,
88 de->name_len[0] >> 1, nls);
89 }
90 if ((len > 2) && (outname[len-2] == ';') && (outname[len-1] == '1')) {
91 len -= 2;
92 }
93
94 /*
95 * Windows doesn't like periods at the end of a name,
96 * so neither do we
97 */
98 while (len >= 2 && (outname[len-1] == '.')) {
99 len--;
100 }
101
102 return len;
103 }
104