aboutsummaryrefslogtreecommitdiff
path: root/fs/jfs/jfs_unicode.c
blob: 0543f7fd436486d489875ee56bbd661539b31dd9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
/*
 *   Copyright (C) International Business Machines Corp., 2000-2004
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or 
 *   (at your option) any later version.
 * 
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software 
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/fs.h>
#include <linux/slab.h>
#include "jfs_incore.h"
#include "jfs_filsys.h"
#include "jfs_unicode.h"
#include "jfs_debug.h"

/*
 * NAME:	jfs_strfromUCS()
 *
 * FUNCTION:	Convert little-endian unicode string to character string
 *
 */
int jfs_strfromUCS_le(char *to, const __le16 * from,
		      int len, struct nls_table *codepage)
{
	int i;
	int outlen = 0;
	static int warn_again = 5;	/* Only warn up to 5 times total */
	int warn = !!warn_again;	/* once per string */

	if (codepage) {
		for (i = 0; (i < len) && from[i]; i++) {
			int charlen;
			charlen =
			    codepage->uni2char(le16_to_cpu(from[i]),
					       &to[outlen],
					       NLS_MAX_CHARSET_SIZE);
			if (charlen > 0)
				outlen += charlen;
			else
				to[outlen++] = '?';
		}
	} else {
		for (i = 0; (i < len) && from[i]; i++) {
			if (unlikely(le16_to_cpu(from[i]) & 0xff00)) {
				to[i] = '?';
				if (unlikely(warn)) {
					warn--;
					warn_again--;
					printk(KERN_ERR
			"non-latin1 character 0x%x found in JFS file name\n", 
		       			       le16_to_cpu(from[i]));
					printk(KERN_ERR
				"mount with iocharset=utf8 to access\n");
				}

			}
			else
				to[i] = (char) (le16_to_cpu(from[i]));
		}
		outlen = i;
	}
	to[outlen] = 0;
	return outlen;
}

/*
 * NAME:	jfs_strtoUCS()
 *
 * FUNCTION:	Convert character string to unicode string
 *
 */
static int jfs_strtoUCS(wchar_t * to, const unsigned char *from, int len,
		struct nls_table *codepage)
{
	int charlen;
	int i;

	if (codepage) {
		for (i = 0; len && *from; i++, from += charlen, len -= charlen)
		{
			charlen = codepage->char2uni(from, len, &to[i]);
			if (charlen < 1) {
				jfs_err("jfs_strtoUCS: char2uni returned %d.",
					charlen);
				jfs_err("charset = %s, char = 0x%x",
					codepage->charset, *from);
				return charlen;
			}
		}
	} else {
		for (i = 0; (i < len) && from[i]; i++)
			to[i] = (wchar_t) from[i];
	}

	to[i] = 0;
	return i;
}

/*
 * NAME:	get_UCSname()
 *
 * FUNCTION:	Allocate and translate to unicode string
 *
 */
int get_UCSname(struct component_name * uniName, struct dentry *dentry)
{
	struct nls_table *nls_tab = JFS_SBI(dentry->d_sb)->nls_tab;
	int length = dentry->d_name.len;

	if (length > JFS_NAME_MAX)
		return -ENAMETOOLONG;

	uniName->name =
	    kmalloc((length + 1) * sizeof(wchar_t), GFP_NOFS);

	if (uniName->name == NULL)
		return -ENOMEM;

	uniName->namlen = jfs_strtoUCS(uniName->name, dentry->d_name.name,
				       length, nls_tab);

	if (uniName->namlen < 0) {
		kfree(uniName->name);
		return uniName->namlen;
	}

	return 0;
}