1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) International Business Machines Corp., 2000-2004
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/fs.h>
7*4882a593Smuzhiyun #include <linux/slab.h>
8*4882a593Smuzhiyun #include "jfs_incore.h"
9*4882a593Smuzhiyun #include "jfs_filsys.h"
10*4882a593Smuzhiyun #include "jfs_unicode.h"
11*4882a593Smuzhiyun #include "jfs_debug.h"
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun /*
14*4882a593Smuzhiyun * NAME: jfs_strfromUCS()
15*4882a593Smuzhiyun *
16*4882a593Smuzhiyun * FUNCTION: Convert little-endian unicode string to character string
17*4882a593Smuzhiyun *
18*4882a593Smuzhiyun */
jfs_strfromUCS_le(char * to,const __le16 * from,int len,struct nls_table * codepage)19*4882a593Smuzhiyun int jfs_strfromUCS_le(char *to, const __le16 * from,
20*4882a593Smuzhiyun int len, struct nls_table *codepage)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun int i;
23*4882a593Smuzhiyun int outlen = 0;
24*4882a593Smuzhiyun static int warn_again = 5; /* Only warn up to 5 times total */
25*4882a593Smuzhiyun int warn = !!warn_again; /* once per string */
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun if (codepage) {
28*4882a593Smuzhiyun for (i = 0; (i < len) && from[i]; i++) {
29*4882a593Smuzhiyun int charlen;
30*4882a593Smuzhiyun charlen =
31*4882a593Smuzhiyun codepage->uni2char(le16_to_cpu(from[i]),
32*4882a593Smuzhiyun &to[outlen],
33*4882a593Smuzhiyun NLS_MAX_CHARSET_SIZE);
34*4882a593Smuzhiyun if (charlen > 0)
35*4882a593Smuzhiyun outlen += charlen;
36*4882a593Smuzhiyun else
37*4882a593Smuzhiyun to[outlen++] = '?';
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun } else {
40*4882a593Smuzhiyun for (i = 0; (i < len) && from[i]; i++) {
41*4882a593Smuzhiyun if (unlikely(le16_to_cpu(from[i]) & 0xff00)) {
42*4882a593Smuzhiyun to[i] = '?';
43*4882a593Smuzhiyun if (unlikely(warn)) {
44*4882a593Smuzhiyun warn--;
45*4882a593Smuzhiyun warn_again--;
46*4882a593Smuzhiyun printk(KERN_ERR
47*4882a593Smuzhiyun "non-latin1 character 0x%x found in JFS file name\n",
48*4882a593Smuzhiyun le16_to_cpu(from[i]));
49*4882a593Smuzhiyun printk(KERN_ERR
50*4882a593Smuzhiyun "mount with iocharset=utf8 to access\n");
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun else
55*4882a593Smuzhiyun to[i] = (char) (le16_to_cpu(from[i]));
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun outlen = i;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun to[outlen] = 0;
60*4882a593Smuzhiyun return outlen;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun /*
64*4882a593Smuzhiyun * NAME: jfs_strtoUCS()
65*4882a593Smuzhiyun *
66*4882a593Smuzhiyun * FUNCTION: Convert character string to unicode string
67*4882a593Smuzhiyun *
68*4882a593Smuzhiyun */
jfs_strtoUCS(wchar_t * to,const unsigned char * from,int len,struct nls_table * codepage)69*4882a593Smuzhiyun static int jfs_strtoUCS(wchar_t * to, const unsigned char *from, int len,
70*4882a593Smuzhiyun struct nls_table *codepage)
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun int charlen;
73*4882a593Smuzhiyun int i;
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun if (codepage) {
76*4882a593Smuzhiyun for (i = 0; len && *from; i++, from += charlen, len -= charlen)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun charlen = codepage->char2uni(from, len, &to[i]);
79*4882a593Smuzhiyun if (charlen < 1) {
80*4882a593Smuzhiyun jfs_err("jfs_strtoUCS: char2uni returned %d.",
81*4882a593Smuzhiyun charlen);
82*4882a593Smuzhiyun jfs_err("charset = %s, char = 0x%x",
83*4882a593Smuzhiyun codepage->charset, *from);
84*4882a593Smuzhiyun return charlen;
85*4882a593Smuzhiyun }
86*4882a593Smuzhiyun }
87*4882a593Smuzhiyun } else {
88*4882a593Smuzhiyun for (i = 0; (i < len) && from[i]; i++)
89*4882a593Smuzhiyun to[i] = (wchar_t) from[i];
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun to[i] = 0;
93*4882a593Smuzhiyun return i;
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun /*
97*4882a593Smuzhiyun * NAME: get_UCSname()
98*4882a593Smuzhiyun *
99*4882a593Smuzhiyun * FUNCTION: Allocate and translate to unicode string
100*4882a593Smuzhiyun *
101*4882a593Smuzhiyun */
get_UCSname(struct component_name * uniName,struct dentry * dentry)102*4882a593Smuzhiyun int get_UCSname(struct component_name * uniName, struct dentry *dentry)
103*4882a593Smuzhiyun {
104*4882a593Smuzhiyun struct nls_table *nls_tab = JFS_SBI(dentry->d_sb)->nls_tab;
105*4882a593Smuzhiyun int length = dentry->d_name.len;
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun if (length > JFS_NAME_MAX)
108*4882a593Smuzhiyun return -ENAMETOOLONG;
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun uniName->name =
111*4882a593Smuzhiyun kmalloc_array(length + 1, sizeof(wchar_t), GFP_NOFS);
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun if (uniName->name == NULL)
114*4882a593Smuzhiyun return -ENOMEM;
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun uniName->namlen = jfs_strtoUCS(uniName->name, dentry->d_name.name,
117*4882a593Smuzhiyun length, nls_tab);
118*4882a593Smuzhiyun
119*4882a593Smuzhiyun if (uniName->namlen < 0) {
120*4882a593Smuzhiyun kfree(uniName->name);
121*4882a593Smuzhiyun return uniName->namlen;
122*4882a593Smuzhiyun }
123*4882a593Smuzhiyun
124*4882a593Smuzhiyun return 0;
125*4882a593Smuzhiyun }
126