1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * linux/fs/isofs/joliet.c |
4 | * |
5 | * (C) 1996 Gordon Chaffee |
6 | * |
7 | * Joliet: Microsoft's Unicode extensions to iso9660 |
8 | */ |
9 | |
10 | #include <linux/types.h> |
11 | #include <linux/nls.h> |
12 | #include "isofs.h" |
13 | |
14 | /* |
15 | * Convert Unicode 16 to UTF-8 or ASCII. |
16 | */ |
17 | static int |
18 | uni16_to_x8(unsigned char *ascii, __be16 *uni, int len, struct nls_table *nls) |
19 | { |
20 | __be16 *ip, ch; |
21 | unsigned char *op; |
22 | |
23 | ip = uni; |
24 | op = ascii; |
25 | |
26 | while ((ch = get_unaligned(ip)) && len) { |
27 | int llen; |
28 | llen = nls->uni2char(be16_to_cpu(ch), op, NLS_MAX_CHARSET_SIZE); |
29 | if (llen > 0) |
30 | op += llen; |
31 | else |
32 | *op++ = '?'; |
33 | ip++; |
34 | |
35 | len--; |
36 | } |
37 | *op = 0; |
38 | return (op - ascii); |
39 | } |
40 | |
41 | int |
42 | get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode) |
43 | { |
44 | struct nls_table *nls; |
45 | unsigned char len = 0; |
46 | |
47 | nls = ISOFS_SB(sb: inode->i_sb)->s_nls_iocharset; |
48 | |
49 | if (!nls) { |
50 | len = utf16s_to_utf8s(pwcs: (const wchar_t *) de->name, |
51 | len: de->name_len[0] >> 1, endian: UTF16_BIG_ENDIAN, |
52 | s: outname, PAGE_SIZE); |
53 | } else { |
54 | len = uni16_to_x8(ascii: outname, uni: (__be16 *) de->name, |
55 | len: de->name_len[0] >> 1, nls); |
56 | } |
57 | if ((len > 2) && (outname[len-2] == ';') && (outname[len-1] == '1')) |
58 | len -= 2; |
59 | |
60 | /* |
61 | * Windows doesn't like periods at the end of a name, |
62 | * so neither do we |
63 | */ |
64 | while (len >= 2 && (outname[len-1] == '.')) |
65 | len--; |
66 | |
67 | return len; |
68 | } |
69 | |