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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*/
#include <linux/string.h>
#include <linux/nls.h>
#include "exfat.h"
static u16 bad_uni_chars[] = {
/* " * / : < > ? \ | */
0x0022, 0x002A, 0x002F, 0x003A,
0x003C, 0x003E, 0x003F, 0x005C, 0x007C,
0
};
static int convert_ch_to_uni(struct nls_table *nls, u16 *uni, u8 *ch,
bool *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 */
pr_info("%s: fail to use nls\n", __func__);
if (lossy)
*lossy = true;
*uni = (u16)'_';
if (!strcmp(nls->charset, "utf8"))
return 1;
else
return 2;
}
return len;
}
static int convert_uni_to_ch(struct nls_table *nls, u8 *ch, u16 uni,
bool *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 */
pr_info("%s: fail to use nls\n", __func__);
if (lossy)
*lossy = true;
ch[0] = '_';
return 1;
}
return len;
}
u16 nls_upper(struct super_block *sb, u16 a)
{
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
if (EXFAT_SB(sb)->options.casesensitive)
return a;
if (p_fs->vol_utbl && p_fs->vol_utbl[get_col_index(a)])
return p_fs->vol_utbl[get_col_index(a)][get_row_index(a)];
else
return a;
}
static u16 *nls_wstrchr(u16 *str, u16 wchar)
{
while (*str) {
if (*(str++) == wchar)
return str;
}
return NULL;
}
int 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;
}
void nls_uniname_to_cstring(struct super_block *sb, u8 *p_cstring,
struct 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) {
len = utf16s_to_utf8s(uniname, MAX_NAME_LENGTH,
UTF16_HOST_ENDIAN, p_cstring,
MAX_NAME_LENGTH);
p_cstring[len] = 0;
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';
}
void nls_cstring_to_uniname(struct super_block *sb,
struct uni_name_t *p_uniname, u8 *p_cstring,
bool *p_lossy)
{
int i, j;
bool 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(p_cstring);
while (*(--end_of_name) == ' ') {
if (end_of_name < p_cstring)
break;
}
*(++end_of_name) = '\0';
if (strcmp(p_cstring, ".") && strcmp(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) {
i = utf8s_to_utf16s(p_cstring, MAX_NAME_LENGTH,
UTF16_HOST_ENDIAN, uniname,
MAX_NAME_LENGTH);
for (j = 0; j < i; j++)
SET16_A(upname + j * 2, nls_upper(sb, uniname[j]));
uniname[i] = '\0';
} else {
i = 0;
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(upname, j << 1, 0,
CS_DEFAULT);
if (p_lossy)
*p_lossy = lossy;
}
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