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Commit | Line | Data |
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1da177e4 LT |
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/string.h> | |
10 | #include <linux/nls.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/iso_fs.h> | |
13 | #include <asm/unaligned.h> | |
14 | ||
15 | /* | |
16 | * Convert Unicode 16 to UTF8 or ASCII. | |
17 | */ | |
18 | static int | |
19 | uni16_to_x8(unsigned char *ascii, u16 *uni, int len, struct nls_table *nls) | |
20 | { | |
21 | wchar_t *ip, ch; | |
22 | unsigned char *op; | |
23 | ||
24 | ip = uni; | |
25 | op = ascii; | |
26 | ||
27 | while ((ch = get_unaligned(ip)) && len) { | |
28 | int llen; | |
29 | ch = be16_to_cpu(ch); | |
30 | if ((llen = nls->uni2char(ch, op, NLS_MAX_CHARSET_SIZE)) > 0) | |
31 | op += llen; | |
32 | else | |
33 | *op++ = '?'; | |
34 | ip++; | |
35 | ||
36 | len--; | |
37 | } | |
38 | *op = 0; | |
39 | return (op - ascii); | |
40 | } | |
41 | ||
42 | /* Convert big endian wide character string to utf8 */ | |
43 | static int | |
44 | wcsntombs_be(__u8 *s, const __u8 *pwcs, int inlen, int maxlen) | |
45 | { | |
46 | const __u8 *ip; | |
47 | __u8 *op; | |
48 | int size; | |
49 | __u16 c; | |
50 | ||
51 | op = s; | |
52 | ip = pwcs; | |
53 | while ((*ip || ip[1]) && (maxlen > 0) && (inlen > 0)) { | |
54 | c = (*ip << 8) | ip[1]; | |
55 | if (c > 0x7f) { | |
56 | size = utf8_wctomb(op, c, maxlen); | |
57 | if (size == -1) { | |
58 | /* Ignore character and move on */ | |
59 | maxlen--; | |
60 | } else { | |
61 | op += size; | |
62 | maxlen -= size; | |
63 | } | |
64 | } else { | |
65 | *op++ = (__u8) c; | |
66 | } | |
67 | ip += 2; | |
68 | inlen--; | |
69 | } | |
70 | return (op - s); | |
71 | } | |
72 | ||
73 | int | |
74 | get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode) | |
75 | { | |
76 | unsigned char utf8; | |
77 | struct nls_table *nls; | |
78 | unsigned char len = 0; | |
79 | ||
80 | utf8 = ISOFS_SB(inode->i_sb)->s_utf8; | |
81 | nls = ISOFS_SB(inode->i_sb)->s_nls_iocharset; | |
82 | ||
83 | if (utf8) { | |
84 | len = wcsntombs_be(outname, de->name, | |
85 | de->name_len[0] >> 1, PAGE_SIZE); | |
86 | } else { | |
87 | len = uni16_to_x8(outname, (u16 *) de->name, | |
88 | de->name_len[0] >> 1, nls); | |
89 | } | |
90 | if ((len > 2) && (outname[len-2] == ';') && (outname[len-1] == '1')) { | |
91 | len -= 2; | |
92 | } | |
93 | ||
94 | /* | |
95 | * Windows doesn't like periods at the end of a name, | |
96 | * so neither do we | |
97 | */ | |
98 | while (len >= 2 && (outname[len-1] == '.')) { | |
99 | len--; | |
100 | } | |
101 | ||
102 | return len; | |
103 | } |