forked from mirrors/linux
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
/*
|
|
* collate.c - NTFS kernel collation handling. Part of the Linux-NTFS project.
|
|
*
|
|
* Copyright (c) 2004 Anton Altaparmakov
|
|
*
|
|
* This program/include file is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as published
|
|
* by the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program/include file is distributed in the hope that it will be
|
|
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program (in the main directory of the Linux-NTFS
|
|
* distribution in the file COPYING); if not, write to the Free Software
|
|
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include "collate.h"
|
|
#include "debug.h"
|
|
#include "ntfs.h"
|
|
|
|
static int ntfs_collate_binary(ntfs_volume *vol,
|
|
const void *data1, const int data1_len,
|
|
const void *data2, const int data2_len)
|
|
{
|
|
int rc;
|
|
|
|
ntfs_debug("Entering.");
|
|
rc = memcmp(data1, data2, min(data1_len, data2_len));
|
|
if (!rc && (data1_len != data2_len)) {
|
|
if (data1_len < data2_len)
|
|
rc = -1;
|
|
else
|
|
rc = 1;
|
|
}
|
|
ntfs_debug("Done, returning %i", rc);
|
|
return rc;
|
|
}
|
|
|
|
static int ntfs_collate_ntofs_ulong(ntfs_volume *vol,
|
|
const void *data1, const int data1_len,
|
|
const void *data2, const int data2_len)
|
|
{
|
|
int rc;
|
|
u32 d1, d2;
|
|
|
|
ntfs_debug("Entering.");
|
|
// FIXME: We don't really want to bug here.
|
|
BUG_ON(data1_len != data2_len);
|
|
BUG_ON(data1_len != 4);
|
|
d1 = le32_to_cpup(data1);
|
|
d2 = le32_to_cpup(data2);
|
|
if (d1 < d2)
|
|
rc = -1;
|
|
else {
|
|
if (d1 == d2)
|
|
rc = 0;
|
|
else
|
|
rc = 1;
|
|
}
|
|
ntfs_debug("Done, returning %i", rc);
|
|
return rc;
|
|
}
|
|
|
|
typedef int (*ntfs_collate_func_t)(ntfs_volume *, const void *, const int,
|
|
const void *, const int);
|
|
|
|
static ntfs_collate_func_t ntfs_do_collate0x0[3] = {
|
|
ntfs_collate_binary,
|
|
NULL/*ntfs_collate_file_name*/,
|
|
NULL/*ntfs_collate_unicode_string*/,
|
|
};
|
|
|
|
static ntfs_collate_func_t ntfs_do_collate0x1[4] = {
|
|
ntfs_collate_ntofs_ulong,
|
|
NULL/*ntfs_collate_ntofs_sid*/,
|
|
NULL/*ntfs_collate_ntofs_security_hash*/,
|
|
NULL/*ntfs_collate_ntofs_ulongs*/,
|
|
};
|
|
|
|
/**
|
|
* ntfs_collate - collate two data items using a specified collation rule
|
|
* @vol: ntfs volume to which the data items belong
|
|
* @cr: collation rule to use when comparing the items
|
|
* @data1: first data item to collate
|
|
* @data1_len: length in bytes of @data1
|
|
* @data2: second data item to collate
|
|
* @data2_len: length in bytes of @data2
|
|
*
|
|
* Collate the two data items @data1 and @data2 using the collation rule @cr
|
|
* and return -1, 0, ir 1 if @data1 is found, respectively, to collate before,
|
|
* to match, or to collate after @data2.
|
|
*
|
|
* For speed we use the collation rule @cr as an index into two tables of
|
|
* function pointers to call the appropriate collation function.
|
|
*/
|
|
int ntfs_collate(ntfs_volume *vol, COLLATION_RULE cr,
|
|
const void *data1, const int data1_len,
|
|
const void *data2, const int data2_len) {
|
|
int i;
|
|
|
|
ntfs_debug("Entering.");
|
|
/*
|
|
* FIXME: At the moment we only support COLLATION_BINARY and
|
|
* COLLATION_NTOFS_ULONG, so we BUG() for everything else for now.
|
|
*/
|
|
BUG_ON(cr != COLLATION_BINARY && cr != COLLATION_NTOFS_ULONG);
|
|
i = le32_to_cpu(cr);
|
|
BUG_ON(i < 0);
|
|
if (i <= 0x02)
|
|
return ntfs_do_collate0x0[i](vol, data1, data1_len,
|
|
data2, data2_len);
|
|
BUG_ON(i < 0x10);
|
|
i -= 0x10;
|
|
if (likely(i <= 3))
|
|
return ntfs_do_collate0x1[i](vol, data1, data1_len,
|
|
data2, data2_len);
|
|
BUG();
|
|
return 0;
|
|
}
|