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/types.h>
10 #include <linux/nls.h>
11 #include "isofs.h"
12
13 /*
14 * Convert Unicode 16 to UTF-8 or ASCII.
15 */
16 static int
uni16_to_x8(unsigned char * ascii,__be16 * uni,int len,struct nls_table * nls)17 uni16_to_x8(unsigned char *ascii, __be16 *uni, int len, struct nls_table *nls)
18 {
19 __be16 *ip, ch;
20 unsigned char *op;
21
22 ip = uni;
23 op = ascii;
24
25 while ((ch = get_unaligned(ip)) && len) {
26 int llen;
27 llen = nls->uni2char(be16_to_cpu(ch), op, NLS_MAX_CHARSET_SIZE);
28 if (llen > 0)
29 op += llen;
30 else
31 *op++ = '?';
32 ip++;
33
34 len--;
35 }
36 *op = 0;
37 return (op - ascii);
38 }
39
40 int
get_joliet_filename(struct iso_directory_record * de,unsigned char * outname,struct inode * inode)41 get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode)
42 {
43 unsigned char utf8;
44 struct nls_table *nls;
45 unsigned char len = 0;
46
47 utf8 = ISOFS_SB(inode->i_sb)->s_utf8;
48 nls = ISOFS_SB(inode->i_sb)->s_nls_iocharset;
49
50 if (utf8) {
51 len = utf16s_to_utf8s((const wchar_t *) de->name,
52 de->name_len[0] >> 1, UTF16_BIG_ENDIAN,
53 outname, PAGE_SIZE);
54 } else {
55 len = uni16_to_x8(outname, (__be16 *) de->name,
56 de->name_len[0] >> 1, nls);
57 }
58 if ((len > 2) && (outname[len-2] == ';') && (outname[len-1] == '1'))
59 len -= 2;
60
61 /*
62 * Windows doesn't like periods at the end of a name,
63 * so neither do we
64 */
65 while (len >= 2 && (outname[len-1] == '.'))
66 len--;
67
68 return len;
69 }
70