jfs_unicode.c
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上传日期:2013-04-10
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文件大小:3k
- /*
- * Copyright (c) International Business Machines Corp., 2000-2002
- *
- * 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_types.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 wchar_t * from, /* LITTLE ENDIAN */
- int len, struct nls_table *codepage)
- {
- int i;
- int outlen = 0;
- 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++] = '?';
- }
- }
- to[outlen] = 0;
- jEVENT(0, ("jfs_strfromUCS returning %d - '%s'n", outlen, to));
- return outlen;
- }
- /*
- * NAME: jfs_strtoUCS()
- *
- * FUNCTION: Convert character string to unicode string
- *
- */
- int jfs_strtoUCS(wchar_t * to,
- const char *from, int len, struct nls_table *codepage)
- {
- int charlen;
- int i;
- jEVENT(0, ("jfs_strtoUCS - '%s'n", from));
- for (i = 0; len && *from; i++, from += charlen, len -= charlen) {
- charlen = codepage->char2uni(from, len, &to[i]);
- if (charlen < 1) {
- jERROR(1, ("jfs_strtoUCS: char2uni returned %d.n",
- charlen));
- jERROR(1, ("charset = %s, char = 0x%xn",
- codepage->charset, (unsigned char) *from));
- to[i] = 0x003f; /* a question mark */
- charlen = 1;
- }
- }
- jEVENT(0, (" returning %dn", 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)
- {
- 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 ENOSPC;
- uniName->namlen = jfs_strtoUCS(uniName->name, dentry->d_name.name,
- length, nls_tab);
- return 0;
- }