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 */
17static int
18uni16_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
41int
42get_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