1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * linux/fs/isofs/joliet.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * (C) 1996 Gordon Chaffee
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Joliet: Microsoft's Unicode extensions to iso9660
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/types.h>
11*4882a593Smuzhiyun #include <linux/nls.h>
12*4882a593Smuzhiyun #include "isofs.h"
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun /*
15*4882a593Smuzhiyun * Convert Unicode 16 to UTF-8 or ASCII.
16*4882a593Smuzhiyun */
17*4882a593Smuzhiyun static int
uni16_to_x8(unsigned char * ascii,__be16 * uni,int len,struct nls_table * nls)18*4882a593Smuzhiyun uni16_to_x8(unsigned char *ascii, __be16 *uni, int len, struct nls_table *nls)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun __be16 *ip, ch;
21*4882a593Smuzhiyun unsigned char *op;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun ip = uni;
24*4882a593Smuzhiyun op = ascii;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun while ((ch = get_unaligned(ip)) && len) {
27*4882a593Smuzhiyun int llen;
28*4882a593Smuzhiyun llen = nls->uni2char(be16_to_cpu(ch), op, NLS_MAX_CHARSET_SIZE);
29*4882a593Smuzhiyun if (llen > 0)
30*4882a593Smuzhiyun op += llen;
31*4882a593Smuzhiyun else
32*4882a593Smuzhiyun *op++ = '?';
33*4882a593Smuzhiyun ip++;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun len--;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun *op = 0;
38*4882a593Smuzhiyun return (op - ascii);
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun int
get_joliet_filename(struct iso_directory_record * de,unsigned char * outname,struct inode * inode)42*4882a593Smuzhiyun get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun struct nls_table *nls;
45*4882a593Smuzhiyun unsigned char len = 0;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun nls = ISOFS_SB(inode->i_sb)->s_nls_iocharset;
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun if (!nls) {
50*4882a593Smuzhiyun len = utf16s_to_utf8s((const wchar_t *) de->name,
51*4882a593Smuzhiyun de->name_len[0] >> 1, UTF16_BIG_ENDIAN,
52*4882a593Smuzhiyun outname, PAGE_SIZE);
53*4882a593Smuzhiyun } else {
54*4882a593Smuzhiyun len = uni16_to_x8(outname, (__be16 *) de->name,
55*4882a593Smuzhiyun de->name_len[0] >> 1, nls);
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun if ((len > 2) && (outname[len-2] == ';') && (outname[len-1] == '1'))
58*4882a593Smuzhiyun len -= 2;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun /*
61*4882a593Smuzhiyun * Windows doesn't like periods at the end of a name,
62*4882a593Smuzhiyun * so neither do we
63*4882a593Smuzhiyun */
64*4882a593Smuzhiyun while (len >= 2 && (outname[len-1] == '.'))
65*4882a593Smuzhiyun len--;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun return len;
68*4882a593Smuzhiyun }
69