449 lines
11 KiB
C
Executable File
449 lines
11 KiB
C
Executable File
/*
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/************************************************************************/
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/* */
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/* PROJECT : exFAT & FAT12/16/32 File System */
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/* FILE : exfat_nls.c */
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/* PURPOSE : exFAT NLS Manager */
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/* */
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/*----------------------------------------------------------------------*/
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/* NOTES */
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/* */
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/*----------------------------------------------------------------------*/
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/* REVISION HISTORY (Ver 0.9) */
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/* */
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/* - 2010.11.15 [Joosun Hahn] : first writing */
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/* */
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/************************************************************************/
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#include "exfat_config.h"
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#include "exfat_data.h"
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#include "exfat_nls.h"
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#include "exfat_api.h"
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#include "exfat_super.h"
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#include "exfat_core.h"
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#include <linux/nls.h>
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/*----------------------------------------------------------------------*/
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/* Global Variable Definitions */
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/*----------------------------------------------------------------------*/
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/*----------------------------------------------------------------------*/
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/* Local Variable Definitions */
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/*----------------------------------------------------------------------*/
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static u16 bad_dos_chars[] = {
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/* + , ; = [ ] */
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0x002B, 0x002C, 0x003B, 0x003D, 0x005B, 0x005D,
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0xFF0B, 0xFF0C, 0xFF1B, 0xFF1D, 0xFF3B, 0xFF3D,
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0
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};
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static u16 bad_uni_chars[] = {
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/* " * / : < > ? \ | */
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0x0022, 0x002A, 0x002F, 0x003A,
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0x003C, 0x003E, 0x003F, 0x005C, 0x007C,
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0
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};
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/*----------------------------------------------------------------------*/
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/* Local Function Declarations */
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/*----------------------------------------------------------------------*/
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static s32 convert_uni_to_ch(struct nls_table *nls, u8 *ch, u16 uni, s32 *lossy);
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static s32 convert_ch_to_uni(struct nls_table *nls, u16 *uni, u8 *ch, s32 *lossy);
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/*======================================================================*/
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/* Global Function Definitions */
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/*======================================================================*/
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u16 nls_upper(struct super_block *sb, u16 a)
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{
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FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
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if (EXFAT_SB(sb)->options.casesensitive)
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return a;
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if (p_fs->vol_utbl != NULL && (p_fs->vol_utbl)[get_col_index(a)] != NULL)
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return (p_fs->vol_utbl)[get_col_index(a)][get_row_index(a)];
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else
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return a;
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}
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u16 *nls_wstrchr(u16 *str, u16 wchar)
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{
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while (*str) {
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if (*(str++) == wchar)
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return str;
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}
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return 0;
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}
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s32 nls_dosname_cmp(struct super_block *sb, u8 *a, u8 *b)
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{
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return strncmp((void *) a, (void *) b, DOS_NAME_LENGTH);
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} /* end of nls_dosname_cmp */
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s32 nls_uniname_cmp(struct super_block *sb, u16 *a, u16 *b)
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{
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int i;
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for (i = 0; i < MAX_NAME_LENGTH; i++, a++, b++) {
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if (nls_upper(sb, *a) != nls_upper(sb, *b))
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return 1;
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if (*a == 0x0)
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return 0;
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}
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return 0;
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} /* end of nls_uniname_cmp */
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void nls_uniname_to_dosname(struct super_block *sb, DOS_NAME_T *p_dosname, UNI_NAME_T *p_uniname, s32 *p_lossy)
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{
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int i, j, len, lossy = FALSE;
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u8 buf[MAX_CHARSET_SIZE];
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u8 lower = 0, upper = 0;
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u8 *dosname = p_dosname->name;
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u16 *uniname = p_uniname->name;
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u16 *p, *last_period;
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struct nls_table *nls = EXFAT_SB(sb)->nls_disk;
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for (i = 0; i < DOS_NAME_LENGTH; i++)
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*(dosname+i) = ' ';
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if (!nls_uniname_cmp(sb, uniname, (u16 *) UNI_CUR_DIR_NAME)) {
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*(dosname) = '.';
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p_dosname->name_case = 0x0;
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if (p_lossy != NULL)
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*p_lossy = FALSE;
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return;
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}
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if (!nls_uniname_cmp(sb, uniname, (u16 *) UNI_PAR_DIR_NAME)) {
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*(dosname) = '.';
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*(dosname+1) = '.';
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p_dosname->name_case = 0x0;
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if (p_lossy != NULL)
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*p_lossy = FALSE;
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return;
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}
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/* search for the last embedded period */
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last_period = NULL;
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for (p = uniname; *p; p++) {
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if (*p == (u16) '.')
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last_period = p;
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}
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i = 0;
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while (i < DOS_NAME_LENGTH) {
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if (i == 8) {
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if (last_period == NULL)
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break;
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if (uniname <= last_period) {
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if (uniname < last_period)
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lossy = TRUE;
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uniname = last_period + 1;
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}
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}
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if (*uniname == (u16) '\0') {
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break;
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} else if (*uniname == (u16) ' ') {
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lossy = TRUE;
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} else if (*uniname == (u16) '.') {
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if (uniname < last_period)
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lossy = TRUE;
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else
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i = 8;
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} else if (nls_wstrchr(bad_dos_chars, *uniname)) {
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lossy = TRUE;
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*(dosname+i) = '_';
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i++;
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} else {
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len = convert_uni_to_ch(nls, buf, *uniname, &lossy);
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if (len > 1) {
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if ((i >= 8) && ((i+len) > DOS_NAME_LENGTH))
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break;
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if ((i < 8) && ((i+len) > 8)) {
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i = 8;
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continue;
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}
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lower = 0xFF;
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for (j = 0; j < len; j++, i++)
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*(dosname+i) = *(buf+j);
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} else { /* len == 1 */
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if ((*buf >= 'a') && (*buf <= 'z')) {
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*(dosname+i) = *buf - ('a' - 'A');
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if (i < 8)
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lower |= 0x08;
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else
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lower |= 0x10;
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} else if ((*buf >= 'A') && (*buf <= 'Z')) {
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*(dosname+i) = *buf;
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if (i < 8)
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upper |= 0x08;
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else
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upper |= 0x10;
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} else {
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*(dosname+i) = *buf;
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}
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i++;
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}
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}
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uniname++;
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}
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if (*dosname == 0xE5)
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*dosname = 0x05;
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if (*uniname != 0x0)
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lossy = TRUE;
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if (upper & lower)
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p_dosname->name_case = 0xFF;
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else
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p_dosname->name_case = lower;
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if (p_lossy != NULL)
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*p_lossy = lossy;
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} /* end of nls_uniname_to_dosname */
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void nls_dosname_to_uniname(struct super_block *sb, UNI_NAME_T *p_uniname, DOS_NAME_T *p_dosname)
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{
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int i = 0, j, n = 0;
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u8 buf[DOS_NAME_LENGTH+2];
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u8 *dosname = p_dosname->name;
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u16 *uniname = p_uniname->name;
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struct nls_table *nls = EXFAT_SB(sb)->nls_disk;
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if (*dosname == 0x05) {
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*buf = 0xE5;
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i++;
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n++;
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}
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for (; i < 8; i++, n++) {
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if (*(dosname+i) == ' ')
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break;
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if ((*(dosname+i) >= 'A') && (*(dosname+i) <= 'Z') && (p_dosname->name_case & 0x08))
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*(buf+n) = *(dosname+i) + ('a' - 'A');
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else
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*(buf+n) = *(dosname+i);
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}
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if (*(dosname+8) != ' ') {
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*(buf+n) = '.';
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n++;
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}
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for (i = 8; i < DOS_NAME_LENGTH; i++, n++) {
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if (*(dosname+i) == ' ')
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break;
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if ((*(dosname+i) >= 'A') && (*(dosname+i) <= 'Z') && (p_dosname->name_case & 0x10))
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*(buf+n) = *(dosname+i) + ('a' - 'A');
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else
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*(buf+n) = *(dosname+i);
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}
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*(buf+n) = '\0';
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i = j = 0;
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while (j < (MAX_NAME_LENGTH-1)) {
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if (*(buf+i) == '\0')
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break;
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i += convert_ch_to_uni(nls, uniname, (buf+i), NULL);
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uniname++;
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j++;
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}
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*uniname = (u16) '\0';
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} /* end of nls_dosname_to_uniname */
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void nls_uniname_to_cstring(struct super_block *sb, u8 *p_cstring, UNI_NAME_T *p_uniname)
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{
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int i, j, len;
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u8 buf[MAX_CHARSET_SIZE];
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u16 *uniname = p_uniname->name;
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struct nls_table *nls = EXFAT_SB(sb)->nls_io;
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if (nls == NULL) {
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len = utf16s_to_utf8s(uniname, MAX_NAME_LENGTH, UTF16_HOST_ENDIAN, p_cstring, MAX_NAME_LENGTH);
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p_cstring[len] = 0;
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return;
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}
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i = 0;
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while (i < (MAX_NAME_LENGTH-1)) {
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if (*uniname == (u16) '\0')
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break;
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len = convert_uni_to_ch(nls, buf, *uniname, NULL);
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if (len > 1) {
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for (j = 0; j < len; j++)
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*p_cstring++ = (char) *(buf+j);
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} else { /* len == 1 */
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*p_cstring++ = (char) *buf;
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}
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uniname++;
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i++;
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}
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*p_cstring = '\0';
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} /* end of nls_uniname_to_cstring */
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void nls_cstring_to_uniname(struct super_block *sb, UNI_NAME_T *p_uniname, u8 *p_cstring, s32 *p_lossy)
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{
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int i, j, lossy = FALSE;
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u8 *end_of_name;
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u8 upname[MAX_NAME_LENGTH * 2];
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u16 *uniname = p_uniname->name;
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struct nls_table *nls = EXFAT_SB(sb)->nls_io;
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/* strip all trailing spaces */
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end_of_name = p_cstring + strlen((char *) p_cstring);
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while (*(--end_of_name) == ' ') {
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if (end_of_name < p_cstring)
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break;
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}
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*(++end_of_name) = '\0';
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if (strcmp((char *) p_cstring, ".") && strcmp((char *) p_cstring, "..")) {
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/* strip all trailing periods */
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while (*(--end_of_name) == '.') {
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if (end_of_name < p_cstring)
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break;
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}
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*(++end_of_name) = '\0';
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}
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if (*p_cstring == '\0')
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lossy = TRUE;
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if (nls == NULL) {
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#if LINUX_VERSION_CODE < KERNEL_VERSION(3,0,101)
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i = utf8s_to_utf16s(p_cstring, MAX_NAME_LENGTH, uniname);
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#else
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i = utf8s_to_utf16s(p_cstring, MAX_NAME_LENGTH, UTF16_HOST_ENDIAN, uniname, MAX_NAME_LENGTH);
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#endif
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for (j = 0; j < i; j++)
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SET16_A(upname + j * 2, nls_upper(sb, uniname[j]));
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uniname[i] = '\0';
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}
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else {
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i = j = 0;
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while (j < (MAX_NAME_LENGTH-1)) {
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if (*(p_cstring+i) == '\0')
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break;
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i += convert_ch_to_uni(nls, uniname, (u8 *)(p_cstring+i), &lossy);
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if ((*uniname < 0x0020) || nls_wstrchr(bad_uni_chars, *uniname))
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lossy = TRUE;
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SET16_A(upname + j * 2, nls_upper(sb, *uniname));
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uniname++;
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j++;
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}
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if (*(p_cstring+i) != '\0')
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lossy = TRUE;
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*uniname = (u16) '\0';
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}
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p_uniname->name_len = j;
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p_uniname->name_hash = calc_checksum_2byte((void *) upname, j<<1, 0, CS_DEFAULT);
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if (p_lossy != NULL)
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*p_lossy = lossy;
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} /* end of nls_cstring_to_uniname */
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/*======================================================================*/
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/* Local Function Definitions */
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/*======================================================================*/
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static s32 convert_ch_to_uni(struct nls_table *nls, u16 *uni, u8 *ch, s32 *lossy)
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{
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int len;
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*uni = 0x0;
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if (ch[0] < 0x80) {
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*uni = (u16) ch[0];
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return 1;
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}
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len = nls->char2uni(ch, NLS_MAX_CHARSET_SIZE, uni);
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if (len < 0) {
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/* conversion failed */
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printk("%s: fail to use nls\n", __func__);
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if (lossy != NULL)
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*lossy = TRUE;
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*uni = (u16) '_';
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if (!strcmp(nls->charset, "utf8"))
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return 1;
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else
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return 2;
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}
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return len;
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} /* end of convert_ch_to_uni */
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static s32 convert_uni_to_ch(struct nls_table *nls, u8 *ch, u16 uni, s32 *lossy)
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{
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int len;
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ch[0] = 0x0;
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if (uni < 0x0080) {
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ch[0] = (u8) uni;
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return 1;
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}
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len = nls->uni2char(uni, ch, NLS_MAX_CHARSET_SIZE);
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if (len < 0) {
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/* conversion failed */
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printk("%s: fail to use nls\n", __func__);
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if (lossy != NULL)
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*lossy = TRUE;
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ch[0] = '_';
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return 1;
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}
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return len;
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} /* end of convert_uni_to_ch */
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