jfs_unicode.c

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/*
 *   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;
}