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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*
* nls.c: exFAT NLS manager
*/
#include <linux/string.h>
#include <linux/nls.h>
#include "exfat.h"
#include "core.h"
/*
* Allow full-width illegal characters :
* "MS windows 7" supports full-width-invalid-name-characters.
* So we should check half-width-invalid-name-characters(ASCII) only
* for compatibility.
*
* " * / : < > ? \ |
*
* patch 1.2.0
*/
static u16 bad_uni_chars[] = {
0x0022, 0x002A, 0x002F, 0x003A,
0x003C, 0x003E, 0x003F, 0x005C, 0x007C,
#if 0 /* allow full-width characters */
0x201C, 0x201D, 0xFF0A, 0xFF0F, 0xFF1A,
0xFF1C, 0xFF1E, 0xFF1F, 0xFF3C, 0xFF5C,
#endif
0
};
static s32 convert_uni_to_ch(struct nls_table *nls, u16 uni, u8 *ch, s32 *lossy);
static s32 convert_ch_to_uni(struct nls_table *nls, u8 *ch, u16 *uni, s32 *lossy);
static u16 nls_upper(struct super_block *sb, u16 a)
{
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
if (EXFAT_SB(sb)->options.casesensitive)
return a;
if ((fsi->vol_utbl)[exfat_get_col_index(a)] != NULL)
return (fsi->vol_utbl)[exfat_get_col_index(a)][exfat_get_row_index(a)];
else
return a;
}
u16 *nls_wstrchr(u16 *str, u16 wchar)
{
while (*str) {
if (*(str++) == wchar)
return str;
}
return 0;
}
s32 exfat_nls_cmp_uniname(struct super_block *sb, u16 *a, u16 *b)
{
s32 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;
}
#define CASE_LOWER_BASE (0x08) /* base is lower case */
#define CASE_LOWER_EXT (0x10) /* extension is lower case */
s32 exfat_nls_sfn_to_uni16s(struct super_block *sb, DOS_NAME_T *p_dosname, UNI_NAME_T *p_uniname)
{
s32 i = 0, j, n = 0;
u8 buf[MAX_DOSNAME_BUF_SIZE];
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 & CASE_LOWER_BASE))
*(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 & CASE_LOWER_EXT))
*(buf+n) = *(dosname+i) + ('a' - 'A');
else
*(buf+n) = *(dosname+i);
}
*(buf+n) = '\0';
i = j = 0;
while (j < MAX_NAME_LENGTH) {
if (*(buf+i) == '\0')
break;
i += convert_ch_to_uni(nls, (buf+i), uniname, NULL);
uniname++;
j++;
}
*uniname = (u16) '\0';
return j;
}
static s32 __nls_utf16s_to_vfsname(struct super_block *sb, UNI_NAME_T *p_uniname, u8 *p_cstring, s32 buflen)
{
s32 len;
const u16 *uniname = p_uniname->name;
/* always len >= 0 */
len = utf16s_to_utf8s(uniname, MAX_NAME_LENGTH, UTF16_HOST_ENDIAN,
p_cstring, buflen);
p_cstring[len] = '\0';
return len;
}
static s32 __nls_vfsname_to_utf16s(struct super_block *sb, const u8 *p_cstring,
const s32 len, UNI_NAME_T *p_uniname, s32 *p_lossy)
{
s32 i, unilen, lossy = NLS_NAME_NO_LOSSY;
u16 upname[MAX_NAME_LENGTH+1];
u16 *uniname = p_uniname->name;
BUG_ON(!len);
unilen = utf8s_to_utf16s(p_cstring, len, UTF16_HOST_ENDIAN,
(wchar_t *)uniname, MAX_NAME_LENGTH+2);
if (unilen < 0) {
MMSG("%s: failed to vfsname_to_utf16(err:%d) "
"vfsnamelen:%d", __func__, unilen, len);
return unilen;
}
if (unilen > MAX_NAME_LENGTH) {
MMSG("%s: failed to vfsname_to_utf16(estr:ENAMETOOLONG) "
"vfsnamelen:%d, unilen:%d>%d",
__func__, len, unilen, MAX_NAME_LENGTH);
return -ENAMETOOLONG;
}
p_uniname->name_len = (u8)(unilen & 0xFF);
for (i = 0; i < unilen; i++) {
if ((*uniname < 0x0020) || nls_wstrchr(bad_uni_chars, *uniname))
lossy |= NLS_NAME_LOSSY;
*(upname+i) = nls_upper(sb, *uniname);
uniname++;
}
*uniname = (u16)'\0';
p_uniname->name_len = unilen;
p_uniname->name_hash = exfat_calc_chksum_2byte((void *) upname,
unilen << 1, 0, CS_DEFAULT);
if (p_lossy)
*p_lossy = lossy;
return unilen;
}
static s32 __exfat_nls_uni16s_to_vfsname(struct super_block *sb, UNI_NAME_T *p_uniname, u8 *p_cstring, s32 buflen)
{
s32 i, j, len, out_len = 0;
u8 buf[MAX_CHARSET_SIZE];
const u16 *uniname = p_uniname->name;
struct nls_table *nls = EXFAT_SB(sb)->nls_io;
i = 0;
while ((i < MAX_NAME_LENGTH) && (out_len < (buflen-1))) {
if (*uniname == (u16)'\0')
break;
len = convert_uni_to_ch(nls, *uniname, buf, NULL);
if (out_len + len >= buflen)
len = (buflen - 1) - out_len;
out_len += len;
if (len > 1) {
for (j = 0; j < len; j++)
*p_cstring++ = (s8) *(buf+j);
} else { /* len == 1 */
*p_cstring++ = (s8) *buf;
}
uniname++;
i++;
}
*p_cstring = '\0';
return out_len;
}
static s32 __exfat_nls_vfsname_to_uni16s(struct super_block *sb, const u8 *p_cstring,
const s32 len, UNI_NAME_T *p_uniname, s32 *p_lossy)
{
s32 i, unilen, lossy = NLS_NAME_NO_LOSSY;
u16 upname[MAX_NAME_LENGTH+1];
u16 *uniname = p_uniname->name;
struct nls_table *nls = EXFAT_SB(sb)->nls_io;
BUG_ON(!len);
i = unilen = 0;
while ((unilen < MAX_NAME_LENGTH) && (i < len)) {
i += convert_ch_to_uni(nls, (u8 *)(p_cstring+i), uniname, &lossy);
if ((*uniname < 0x0020) || nls_wstrchr(bad_uni_chars, *uniname))
lossy |= NLS_NAME_LOSSY;
*(upname+unilen) = nls_upper(sb, *uniname);
uniname++;
unilen++;
}
if (*(p_cstring+i) != '\0')
lossy |= NLS_NAME_OVERLEN;
*uniname = (u16)'\0';
p_uniname->name_len = unilen;
p_uniname->name_hash =
exfat_calc_chksum_2byte((void *) upname, unilen<<1, 0, CS_DEFAULT);
if (p_lossy)
*p_lossy = lossy;
return unilen;
}
s32 exfat_nls_uni16s_to_vfsname(struct super_block *sb, UNI_NAME_T *uniname, u8 *p_cstring, s32 buflen)
{
if (EXFAT_SB(sb)->options.utf8)
return __nls_utf16s_to_vfsname(sb, uniname, p_cstring, buflen);
return __exfat_nls_uni16s_to_vfsname(sb, uniname, p_cstring, buflen);
}
s32 exfat_nls_vfsname_to_uni16s(struct super_block *sb, const u8 *p_cstring, const s32 len, UNI_NAME_T *uniname, s32 *p_lossy)
{
if (EXFAT_SB(sb)->options.utf8)
return __nls_vfsname_to_utf16s(sb, p_cstring, len, uniname, p_lossy);
return __exfat_nls_vfsname_to_uni16s(sb, p_cstring, len, uniname, p_lossy);
}
static s32 convert_ch_to_uni(struct nls_table *nls, u8 *ch, u16 *uni, s32 *lossy)
{
int len;
*uni = 0x0;
if (ch[0] < 0x80) {
*uni = (u16) ch[0];
return 1;
}
len = nls->char2uni(ch, MAX_CHARSET_SIZE, uni);
if (len < 0) {
/* conversion failed */
DMSG("%s: fail to use nls\n", __func__);
if (lossy != NULL)
*lossy |= NLS_NAME_LOSSY;
*uni = (u16) '_';
if (!strcmp(nls->charset, "utf8"))
return 1;
return 2;
}
return len;
}
static s32 convert_uni_to_ch(struct nls_table *nls, u16 uni, u8 *ch, s32 *lossy)
{
int len;
ch[0] = 0x0;
if (uni < 0x0080) {
ch[0] = (u8) uni;
return 1;
}
len = nls->uni2char(uni, ch, MAX_CHARSET_SIZE);
if (len < 0) {
/* conversion failed */
DMSG("%s: fail to use nls\n", __func__);
if (lossy != NULL)
*lossy |= NLS_NAME_LOSSY;
ch[0] = '_';
return 1;
}
return len;
}
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