1 /*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19 #include <linux/fs.h>
20 #include <linux/slab.h>
21 #include "jfs_incore.h"
22 #include "jfs_filsys.h"
23 #include "jfs_unicode.h"
24 #include "jfs_debug.h"
25
26 /*
27 * NAME: jfs_strfromUCS()
28 *
29 * FUNCTION: Convert little-endian unicode string to character string
30 *
31 */
jfs_strfromUCS_le(char * to,const __le16 * from,int len,struct nls_table * codepage)32 int jfs_strfromUCS_le(char *to, const __le16 * from,
33 int len, struct nls_table *codepage)
34 {
35 int i;
36 int outlen = 0;
37 static int warn_again = 5; /* Only warn up to 5 times total */
38 int warn = !!warn_again; /* once per string */
39
40 if (codepage) {
41 for (i = 0; (i < len) && from[i]; i++) {
42 int charlen;
43 charlen =
44 codepage->uni2char(le16_to_cpu(from[i]),
45 &to[outlen],
46 NLS_MAX_CHARSET_SIZE);
47 if (charlen > 0)
48 outlen += charlen;
49 else
50 to[outlen++] = '?';
51 }
52 } else {
53 for (i = 0; (i < len) && from[i]; i++) {
54 if (unlikely(le16_to_cpu(from[i]) & 0xff00)) {
55 to[i] = '?';
56 if (unlikely(warn)) {
57 warn--;
58 warn_again--;
59 printk(KERN_ERR
60 "non-latin1 character 0x%x found in JFS file name\n",
61 le16_to_cpu(from[i]));
62 printk(KERN_ERR
63 "mount with iocharset=utf8 to access\n");
64 }
65
66 }
67 else
68 to[i] = (char) (le16_to_cpu(from[i]));
69 }
70 outlen = i;
71 }
72 to[outlen] = 0;
73 return outlen;
74 }
75
76 /*
77 * NAME: jfs_strtoUCS()
78 *
79 * FUNCTION: Convert character string to unicode string
80 *
81 */
jfs_strtoUCS(wchar_t * to,const unsigned char * from,int len,struct nls_table * codepage)82 static int jfs_strtoUCS(wchar_t * to, const unsigned char *from, int len,
83 struct nls_table *codepage)
84 {
85 int charlen;
86 int i;
87
88 if (codepage) {
89 for (i = 0; len && *from; i++, from += charlen, len -= charlen)
90 {
91 charlen = codepage->char2uni(from, len, &to[i]);
92 if (charlen < 1) {
93 jfs_err("jfs_strtoUCS: char2uni returned %d.",
94 charlen);
95 jfs_err("charset = %s, char = 0x%x",
96 codepage->charset, *from);
97 return charlen;
98 }
99 }
100 } else {
101 for (i = 0; (i < len) && from[i]; i++)
102 to[i] = (wchar_t) from[i];
103 }
104
105 to[i] = 0;
106 return i;
107 }
108
109 /*
110 * NAME: get_UCSname()
111 *
112 * FUNCTION: Allocate and translate to unicode string
113 *
114 */
get_UCSname(struct component_name * uniName,struct dentry * dentry)115 int get_UCSname(struct component_name * uniName, struct dentry *dentry)
116 {
117 struct nls_table *nls_tab = JFS_SBI(dentry->d_sb)->nls_tab;
118 int length = dentry->d_name.len;
119
120 if (length > JFS_NAME_MAX)
121 return -ENAMETOOLONG;
122
123 uniName->name =
124 kmalloc((length + 1) * sizeof(wchar_t), GFP_NOFS);
125
126 if (uniName->name == NULL)
127 return -ENOMEM;
128
129 uniName->namlen = jfs_strtoUCS(uniName->name, dentry->d_name.name,
130 length, nls_tab);
131
132 if (uniName->namlen < 0) {
133 kfree(uniName->name);
134 return uniName->namlen;
135 }
136
137 return 0;
138 }
139