405 lines
7.7 KiB
C
405 lines
7.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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*/
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#include <linux/string.h>
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#include <linux/nls.h>
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#include "exfat.h"
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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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static int convert_ch_to_uni(struct nls_table *nls, u16 *uni, u8 *ch,
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bool *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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pr_info("%s: fail to use nls\n", __func__);
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if (lossy)
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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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}
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static int convert_uni_to_ch(struct nls_table *nls, u8 *ch, u16 uni,
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bool *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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pr_info("%s: fail to use nls\n", __func__);
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if (lossy)
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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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}
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u16 nls_upper(struct super_block *sb, u16 a)
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{
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struct 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 && p_fs->vol_utbl[get_col_index(a)])
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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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static 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 NULL;
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}
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int nls_dosname_cmp(struct super_block *sb, u8 *a, u8 *b)
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{
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return strncmp(a, b, DOS_NAME_LENGTH);
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}
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int 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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}
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void nls_uniname_to_dosname(struct super_block *sb,
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struct dos_name_t *p_dosname,
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struct uni_name_t *p_uniname, bool *p_lossy)
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{
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int i, j, len;
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bool 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)
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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)
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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)
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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)
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*p_lossy = lossy;
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}
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void nls_dosname_to_uniname(struct super_block *sb,
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struct uni_name_t *p_uniname,
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struct 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') &&
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(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') &&
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(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 = 0;
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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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}
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void nls_uniname_to_cstring(struct super_block *sb, u8 *p_cstring,
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struct 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) {
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len = utf16s_to_utf8s(uniname, MAX_NAME_LENGTH,
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UTF16_HOST_ENDIAN, p_cstring,
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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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}
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void nls_cstring_to_uniname(struct super_block *sb,
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struct uni_name_t *p_uniname, u8 *p_cstring,
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bool *p_lossy)
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{
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int i, j;
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bool 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(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(p_cstring, ".") && strcmp(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) {
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i = utf8s_to_utf16s(p_cstring, MAX_NAME_LENGTH,
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UTF16_HOST_ENDIAN, uniname,
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MAX_NAME_LENGTH);
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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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} else {
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i = 0;
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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,
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(u8 *)(p_cstring + i), &lossy);
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if ((*uniname < 0x0020) ||
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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(upname, j << 1, 0,
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CS_DEFAULT);
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if (p_lossy)
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*p_lossy = lossy;
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}
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