mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
a3a956c78e
This commit adds mount option and additional functions. Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
116 lines
2.3 KiB
C
116 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
*
|
|
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
|
|
#include "ntfs_fs.h"
|
|
|
|
static inline u16 upcase_unicode_char(const u16 *upcase, u16 chr)
|
|
{
|
|
if (chr < 'a')
|
|
return chr;
|
|
|
|
if (chr <= 'z')
|
|
return chr - ('a' - 'A');
|
|
|
|
return upcase[chr];
|
|
}
|
|
|
|
/*
|
|
* ntfs_cmp_names
|
|
*
|
|
* Thanks Kari Argillander <kari.argillander@gmail.com> for idea and implementation 'bothcase'
|
|
*
|
|
* Straight way to compare names:
|
|
* - Case insensitive
|
|
* - If name equals and 'bothcases' then
|
|
* - Case sensitive
|
|
* 'Straight way' code scans input names twice in worst case.
|
|
* Optimized code scans input names only once.
|
|
*/
|
|
int ntfs_cmp_names(const __le16 *s1, size_t l1, const __le16 *s2, size_t l2,
|
|
const u16 *upcase, bool bothcase)
|
|
{
|
|
int diff1 = 0;
|
|
int diff2;
|
|
size_t len = min(l1, l2);
|
|
|
|
if (!bothcase && upcase)
|
|
goto case_insentive;
|
|
|
|
for (; len; s1++, s2++, len--) {
|
|
diff1 = le16_to_cpu(*s1) - le16_to_cpu(*s2);
|
|
if (diff1) {
|
|
if (bothcase && upcase)
|
|
goto case_insentive;
|
|
|
|
return diff1;
|
|
}
|
|
}
|
|
return l1 - l2;
|
|
|
|
case_insentive:
|
|
for (; len; s1++, s2++, len--) {
|
|
diff2 = upcase_unicode_char(upcase, le16_to_cpu(*s1)) -
|
|
upcase_unicode_char(upcase, le16_to_cpu(*s2));
|
|
if (diff2)
|
|
return diff2;
|
|
}
|
|
|
|
diff2 = l1 - l2;
|
|
return diff2 ? diff2 : diff1;
|
|
}
|
|
|
|
int ntfs_cmp_names_cpu(const struct cpu_str *uni1, const struct le_str *uni2,
|
|
const u16 *upcase, bool bothcase)
|
|
{
|
|
const u16 *s1 = uni1->name;
|
|
const __le16 *s2 = uni2->name;
|
|
size_t l1 = uni1->len;
|
|
size_t l2 = uni2->len;
|
|
size_t len = min(l1, l2);
|
|
int diff1 = 0;
|
|
int diff2;
|
|
|
|
if (!bothcase && upcase)
|
|
goto case_insentive;
|
|
|
|
for (; len; s1++, s2++, len--) {
|
|
diff1 = *s1 - le16_to_cpu(*s2);
|
|
if (diff1) {
|
|
if (bothcase && upcase)
|
|
goto case_insentive;
|
|
|
|
return diff1;
|
|
}
|
|
}
|
|
return l1 - l2;
|
|
|
|
case_insentive:
|
|
for (; len; s1++, s2++, len--) {
|
|
diff2 = upcase_unicode_char(upcase, *s1) -
|
|
upcase_unicode_char(upcase, le16_to_cpu(*s2));
|
|
if (diff2)
|
|
return diff2;
|
|
}
|
|
|
|
diff2 = l1 - l2;
|
|
return diff2 ? diff2 : diff1;
|
|
}
|
|
|
|
/* Helper function for ntfs_d_hash. */
|
|
unsigned long ntfs_names_hash(const u16 *name, size_t len, const u16 *upcase,
|
|
unsigned long hash)
|
|
{
|
|
while (len--) {
|
|
unsigned int c = upcase_unicode_char(upcase, *name++);
|
|
hash = partial_name_hash(c, hash);
|
|
}
|
|
|
|
return hash;
|
|
}
|