xref: /linux/fs/isofs/joliet.c (revision 005438a8eef063495ac059d128eea71b58de50e5)
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
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
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