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huawei-mrd-kernel/fs/exfat/exfat_nls.c

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/*
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/************************************************************************/
/* */
/* PROJECT : exFAT & FAT12/16/32 File System */
/* FILE : exfat_nls.c */
/* PURPOSE : exFAT NLS Manager */
/* */
/*----------------------------------------------------------------------*/
/* NOTES */
/* */
/*----------------------------------------------------------------------*/
/* REVISION HISTORY (Ver 0.9) */
/* */
/* - 2010.11.15 [Joosun Hahn] : first writing */
/* */
/************************************************************************/
#include "exfat_config.h"
#include "exfat_data.h"
#include "exfat_nls.h"
#include "exfat_api.h"
#include "exfat_super.h"
#include "exfat_core.h"
#include <linux/nls.h>
/*----------------------------------------------------------------------*/
/* Global Variable Definitions */
/*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*/
/* Local Variable Definitions */
/*----------------------------------------------------------------------*/
static u16 bad_dos_chars[] = {
/* + , ; = [ ] */
0x002B, 0x002C, 0x003B, 0x003D, 0x005B, 0x005D,
0xFF0B, 0xFF0C, 0xFF1B, 0xFF1D, 0xFF3B, 0xFF3D,
0
};
static u16 bad_uni_chars[] = {
/* " * / : < > ? \ | */
0x0022, 0x002A, 0x002F, 0x003A,
0x003C, 0x003E, 0x003F, 0x005C, 0x007C,
0
};
/*----------------------------------------------------------------------*/
/* Local Function Declarations */
/*----------------------------------------------------------------------*/
static s32 convert_uni_to_ch(struct nls_table *nls, u8 *ch, u16 uni, s32 *lossy);
static s32 convert_ch_to_uni(struct nls_table *nls, u16 *uni, u8 *ch, s32 *lossy);
/*======================================================================*/
/* Global Function Definitions */
/*======================================================================*/
u16 nls_upper(struct super_block *sb, u16 a)
{
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
if (EXFAT_SB(sb)->options.casesensitive)
return a;
if (p_fs->vol_utbl != NULL && (p_fs->vol_utbl)[get_col_index(a)] != NULL)
return (p_fs->vol_utbl)[get_col_index(a)][get_row_index(a)];
else
return a;
}
u16 *nls_wstrchr(u16 *str, u16 wchar)
{
while (*str) {
if (*(str++) == wchar)
return str;
}
return 0;
}
s32 nls_dosname_cmp(struct super_block *sb, u8 *a, u8 *b)
{
return strncmp((void *) a, (void *) b, DOS_NAME_LENGTH);
} /* end of nls_dosname_cmp */
s32 nls_uniname_cmp(struct super_block *sb, u16 *a, u16 *b)
{
int i;
for (i = 0; i < MAX_NAME_LENGTH; i++, a++, b++) {
if (nls_upper(sb, *a) != nls_upper(sb, *b))
return 1;
if (*a == 0x0)
return 0;
}
return 0;
} /* end of nls_uniname_cmp */
void nls_uniname_to_dosname(struct super_block *sb, DOS_NAME_T *p_dosname, UNI_NAME_T *p_uniname, s32 *p_lossy)
{
int i, j, len, lossy = FALSE;
u8 buf[MAX_CHARSET_SIZE];
u8 lower = 0, upper = 0;
u8 *dosname = p_dosname->name;
u16 *uniname = p_uniname->name;
u16 *p, *last_period;
struct nls_table *nls = EXFAT_SB(sb)->nls_disk;
for (i = 0; i < DOS_NAME_LENGTH; i++)
*(dosname+i) = ' ';
if (!nls_uniname_cmp(sb, uniname, (u16 *) UNI_CUR_DIR_NAME)) {
*(dosname) = '.';
p_dosname->name_case = 0x0;
if (p_lossy != NULL)
*p_lossy = FALSE;
return;
}
if (!nls_uniname_cmp(sb, uniname, (u16 *) UNI_PAR_DIR_NAME)) {
*(dosname) = '.';
*(dosname+1) = '.';
p_dosname->name_case = 0x0;
if (p_lossy != NULL)
*p_lossy = FALSE;
return;
}
/* search for the last embedded period */
last_period = NULL;
for (p = uniname; *p; p++) {
if (*p == (u16) '.')
last_period = p;
}
i = 0;
while (i < DOS_NAME_LENGTH) {
if (i == 8) {
if (last_period == NULL)
break;
if (uniname <= last_period) {
if (uniname < last_period)
lossy = TRUE;
uniname = last_period + 1;
}
}
if (*uniname == (u16) '\0') {
break;
} else if (*uniname == (u16) ' ') {
lossy = TRUE;
} else if (*uniname == (u16) '.') {
if (uniname < last_period)
lossy = TRUE;
else
i = 8;
} else if (nls_wstrchr(bad_dos_chars, *uniname)) {
lossy = TRUE;
*(dosname+i) = '_';
i++;
} else {
len = convert_uni_to_ch(nls, buf, *uniname, &lossy);
if (len > 1) {
if ((i >= 8) && ((i+len) > DOS_NAME_LENGTH))
break;
if ((i < 8) && ((i+len) > 8)) {
i = 8;
continue;
}
lower = 0xFF;
for (j = 0; j < len; j++, i++)
*(dosname+i) = *(buf+j);
} else { /* len == 1 */
if ((*buf >= 'a') && (*buf <= 'z')) {
*(dosname+i) = *buf - ('a' - 'A');
if (i < 8)
lower |= 0x08;
else
lower |= 0x10;
} else if ((*buf >= 'A') && (*buf <= 'Z')) {
*(dosname+i) = *buf;
if (i < 8)
upper |= 0x08;
else
upper |= 0x10;
} else {
*(dosname+i) = *buf;
}
i++;
}
}
uniname++;
}
if (*dosname == 0xE5)
*dosname = 0x05;
if (*uniname != 0x0)
lossy = TRUE;
if (upper & lower)
p_dosname->name_case = 0xFF;
else
p_dosname->name_case = lower;
if (p_lossy != NULL)
*p_lossy = lossy;
} /* end of nls_uniname_to_dosname */
void nls_dosname_to_uniname(struct super_block *sb, UNI_NAME_T *p_uniname, DOS_NAME_T *p_dosname)
{
int i = 0, j, n = 0;
u8 buf[DOS_NAME_LENGTH+2];
u8 *dosname = p_dosname->name;
u16 *uniname = p_uniname->name;
struct nls_table *nls = EXFAT_SB(sb)->nls_disk;
if (*dosname == 0x05) {
*buf = 0xE5;
i++;
n++;
}
for (; i < 8; i++, n++) {
if (*(dosname+i) == ' ')
break;
if ((*(dosname+i) >= 'A') && (*(dosname+i) <= 'Z') && (p_dosname->name_case & 0x08))
*(buf+n) = *(dosname+i) + ('a' - 'A');
else
*(buf+n) = *(dosname+i);
}
if (*(dosname+8) != ' ') {
*(buf+n) = '.';
n++;
}
for (i = 8; i < DOS_NAME_LENGTH; i++, n++) {
if (*(dosname+i) == ' ')
break;
if ((*(dosname+i) >= 'A') && (*(dosname+i) <= 'Z') && (p_dosname->name_case & 0x10))
*(buf+n) = *(dosname+i) + ('a' - 'A');
else
*(buf+n) = *(dosname+i);
}
*(buf+n) = '\0';
i = j = 0;
while (j < (MAX_NAME_LENGTH-1)) {
if (*(buf+i) == '\0')
break;
i += convert_ch_to_uni(nls, uniname, (buf+i), NULL);
uniname++;
j++;
}
*uniname = (u16) '\0';
} /* end of nls_dosname_to_uniname */
void nls_uniname_to_cstring(struct super_block *sb, u8 *p_cstring, UNI_NAME_T *p_uniname)
{
int i, j, len;
u8 buf[MAX_CHARSET_SIZE];
u16 *uniname = p_uniname->name;
struct nls_table *nls = EXFAT_SB(sb)->nls_io;
if (nls == NULL) {
len = utf16s_to_utf8s(uniname, MAX_NAME_LENGTH, UTF16_HOST_ENDIAN, p_cstring, MAX_NAME_LENGTH);
p_cstring[len] = 0;/* [false alarm]:native code*/
return;
}
i = 0;
while (i < (MAX_NAME_LENGTH-1)) {
if (*uniname == (u16) '\0')
break;
len = convert_uni_to_ch(nls, buf, *uniname, NULL);
if (len > 1) {
for (j = 0; j < len; j++)
*p_cstring++ = (char) *(buf+j);
} else { /* len == 1 */
*p_cstring++ = (char) *buf;
}
uniname++;
i++;
}
*p_cstring = '\0';
} /* end of nls_uniname_to_cstring */
void nls_cstring_to_uniname(struct super_block *sb, UNI_NAME_T *p_uniname, u8 *p_cstring, s32 *p_lossy)
{
int i, j, lossy = FALSE;
u8 *end_of_name;
u8 upname[MAX_NAME_LENGTH * 2];
u16 *uniname = p_uniname->name;
struct nls_table *nls = EXFAT_SB(sb)->nls_io;
/* strip all trailing spaces */
end_of_name = p_cstring + strlen((char *) p_cstring);
while (*(--end_of_name) == ' ') {
if (end_of_name < p_cstring)
break;
}
*(++end_of_name) = '\0';
if (strcmp((char *) p_cstring, ".") && strcmp((char *) p_cstring, "..")) {
/* strip all trailing periods */
while (*(--end_of_name) == '.') {
if (end_of_name < p_cstring)
break;
}
*(++end_of_name) = '\0';
}
if (*p_cstring == '\0')
lossy = TRUE;
if (nls == NULL) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,0,101)
i = utf8s_to_utf16s(p_cstring, MAX_NAME_LENGTH, uniname);
#else
i = utf8s_to_utf16s(p_cstring, MAX_NAME_LENGTH, UTF16_HOST_ENDIAN, uniname, MAX_NAME_LENGTH);
#endif
for (j = 0; j < i; j++)
SET16_A(upname + j * 2, nls_upper(sb, uniname[j]));
uniname[i] = '\0';
}
else {
i = j = 0;
while (j < (MAX_NAME_LENGTH-1)) {
if (*(p_cstring+i) == '\0')
break;
i += convert_ch_to_uni(nls, uniname, (u8 *)(p_cstring+i), &lossy);
if ((*uniname < 0x0020) || nls_wstrchr(bad_uni_chars, *uniname))
lossy = TRUE;
SET16_A(upname + j * 2, nls_upper(sb, *uniname));
uniname++;
j++;
}
if (*(p_cstring+i) != '\0')
lossy = TRUE;
*uniname = (u16) '\0';
}
p_uniname->name_len = j;
p_uniname->name_hash = calc_checksum_2byte((void *) upname, j<<1, 0, CS_DEFAULT);
if (p_lossy != NULL)
*p_lossy = lossy;
} /* end of nls_cstring_to_uniname */
/*======================================================================*/
/* Local Function Definitions */
/*======================================================================*/
static s32 convert_ch_to_uni(struct nls_table *nls, u16 *uni, u8 *ch, s32 *lossy)
{
int len;
*uni = 0x0;
if (ch[0] < 0x80) {
*uni = (u16) ch[0];
return 1;
}
len = nls->char2uni(ch, NLS_MAX_CHARSET_SIZE, uni);
if (len < 0) {
/* conversion failed */
printk("%s: fail to use nls\n", __func__);
if (lossy != NULL)
*lossy = TRUE;
*uni = (u16) '_';
if (!strcmp(nls->charset, "utf8"))
return 1;
else
return 2;
}
return len;
} /* end of convert_ch_to_uni */
static s32 convert_uni_to_ch(struct nls_table *nls, u8 *ch, u16 uni, s32 *lossy)
{
int len;
ch[0] = 0x0;
if (uni < 0x0080) {
ch[0] = (u8) uni;
return 1;
}
len = nls->uni2char(uni, ch, NLS_MAX_CHARSET_SIZE);
if (len < 0) {
/* conversion failed */
printk("%s: fail to use nls\n", __func__);
if (lossy != NULL)
*lossy = TRUE;
ch[0] = '_';
return 1;
}
return len;
} /* end of convert_uni_to_ch */
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