fs/jfs/jfs_unicode.c

   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  */
  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  */
  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  */
 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 -ENOSPC;
 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 }