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https://git.code.sf.net/p/ntfs-3g/ntfs-3g.git
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271 lines
6.8 KiB
C
271 lines
6.8 KiB
C
/**
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* collate.c - NTFS collation handling. Originated from the Linux-NTFS project.
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*
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* Copyright (c) 2004 Anton Altaparmakov
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* Copyright (c) 2005 Yura Pakhuchiy
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the NTFS-3G
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "collate.h"
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#include "debug.h"
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#include "unistr.h"
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#include "logging.h"
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BOOL ntfs_is_collation_rule_supported(COLLATION_RULES cr)
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{
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/*
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* FIXME: At the moment we only support COLLATION_BINARY,
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* COLLATION_NTOFS_ULONG and COLLATION_FILE_NAME so we return false
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* for everything else.
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* JPA added COLLATION_NTOFS_SECURITY_HASH
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*/
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if (cr != COLLATION_BINARY && cr != COLLATION_NTOFS_ULONG
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&& cr != COLLATION_FILE_NAME
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&& cr != COLLATION_NTOFS_SECURITY_HASH)
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return FALSE;
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return TRUE;
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}
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/**
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* ntfs_collate_binary - Which of two binary objects should be listed first
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* @vol: unused
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* @data1:
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* @data1_len:
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* @data2:
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* @data2_len:
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*
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* Description...
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*
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* Returns:
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*/
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static int ntfs_collate_binary(ntfs_volume *vol __attribute__((unused)),
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const void *data1, const int data1_len,
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const void *data2, const int data2_len)
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{
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int rc;
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ntfs_log_trace("Entering.\n");
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rc = memcmp(data1, data2, min(data1_len, data2_len));
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if (!rc && (data1_len != data2_len)) {
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if (data1_len < data2_len)
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rc = -1;
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else
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rc = 1;
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}
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ntfs_log_trace("Done, returning %i.\n", rc);
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return rc;
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}
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/**
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* ntfs_collate_ntofs_ulong - Which of two long ints should be listed first
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* @vol: unused
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* @data1:
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* @data1_len:
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* @data2:
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* @data2_len:
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*
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* Description...
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*
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* Returns:
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*/
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static int ntfs_collate_ntofs_ulong(ntfs_volume *vol __attribute__((unused)),
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const void *data1, const int data1_len,
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const void *data2, const int data2_len)
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{
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int rc;
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u32 d1, d2;
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ntfs_log_trace("Entering.\n");
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if (data1_len != data2_len || data1_len != 4) {
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ntfs_log_error("data1_len or/and data2_len not equal to 4.\n");
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return NTFS_COLLATION_ERROR;
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}
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d1 = le32_to_cpup(data1);
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d2 = le32_to_cpup(data2);
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if (d1 < d2)
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rc = -1;
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else {
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if (d1 == d2)
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rc = 0;
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else
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rc = 1;
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}
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ntfs_log_trace("Done, returning %i.\n", rc);
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return rc;
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}
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/**
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* ntfs_collate_ntofs_security_hash - Which of two security descriptors
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* should be listed first
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* @vol: unused
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* @data1:
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* @data1_len:
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* @data2:
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* @data2_len:
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*
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* JPA compare two security hash keys made of two unsigned le32
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*
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* Returns: -1, 0 or 1 depending of how the keys compare
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*/
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static int ntfs_collate_ntofs_security_hash(ntfs_volume *vol __attribute__((unused)),
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const void *data1, const int data1_len,
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const void *data2, const int data2_len)
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{
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int rc;
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u32 d1, d2;
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const u32 *p1, *p2;
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ntfs_log_trace("Entering.\n");
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if (data1_len != data2_len || data1_len != 8) {
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ntfs_log_error("data1_len or/and data2_len not equal to 8.\n");
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return NTFS_COLLATION_ERROR;
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}
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p1 = (const u32*)data1;
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p2 = (const u32*)data2;
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d1 = le32_to_cpup(p1);
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d2 = le32_to_cpup(p2);
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if (d1 < d2)
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rc = -1;
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else {
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if (d1 > d2)
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rc = 1;
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else {
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d1 = le32_to_cpup(++p1);
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d2 = le32_to_cpup(++p2);
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if (d1 < d2)
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rc = -1;
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else {
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if (d1 > d2)
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rc = 1;
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else
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rc = 0;
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}
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}
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}
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ntfs_log_trace("Done, returning %i.\n", rc);
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return rc;
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}
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/**
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* ntfs_collate_file_name - Which of two filenames should be listed first
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* @vol:
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* @data1:
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* @data1_len: unused
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* @data2:
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* @data2_len: unused
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*
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* Description...
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*
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* Returns:
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*/
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static int ntfs_collate_file_name(ntfs_volume *vol,
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const void *data1, const int data1_len __attribute__((unused)),
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const void *data2, const int data2_len __attribute__((unused)))
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{
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int rc;
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ntfs_log_trace("Entering.\n");
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rc = ntfs_file_values_compare(data1, data2, NTFS_COLLATION_ERROR,
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IGNORE_CASE, vol->upcase, vol->upcase_len);
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if (!rc)
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rc = ntfs_file_values_compare(data1, data2,
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NTFS_COLLATION_ERROR, CASE_SENSITIVE,
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vol->upcase, vol->upcase_len);
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ntfs_log_trace("Done, returning %i.\n", rc);
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return rc;
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}
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typedef int (*ntfs_collate_func_t)(ntfs_volume *, const void *, const int,
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const void *, const int);
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static ntfs_collate_func_t ntfs_do_collate0x0[3] = {
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ntfs_collate_binary,
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ntfs_collate_file_name,
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NULL/*ntfs_collate_unicode_string*/,
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};
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static ntfs_collate_func_t ntfs_do_collate0x1[4] = {
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ntfs_collate_ntofs_ulong,
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NULL/*ntfs_collate_ntofs_sid*/,
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ntfs_collate_ntofs_security_hash,
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NULL/*ntfs_collate_ntofs_ulongs*/,
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};
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/**
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* ntfs_collate - collate two data items using a specified collation rule
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* @vol: ntfs volume to which the data items belong
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* @cr: collation rule to use when comparing the items
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* @data1: first data item to collate
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* @data1_len: length in bytes of @data1
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* @data2: second data item to collate
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* @data2_len: length in bytes of @data2
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*
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* Collate the two data items @data1 and @data2 using the collation rule @cr
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* and return -1, 0, or 1 if @data1 is found, respectively, to collate before,
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* to match, or to collate after @data2.
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*
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* For speed we use the collation rule @cr as an index into two tables of
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* function pointers to call the appropriate collation function.
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*
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* Return NTFS_COLLATION_ERROR if error occurred.
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*/
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int ntfs_collate(ntfs_volume *vol, COLLATION_RULES cr,
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const void *data1, const int data1_len,
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const void *data2, const int data2_len)
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{
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int i;
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ntfs_log_trace("Entering.\n");
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if (!vol || !data1 || !data2 || data1_len < 0 || data2_len < 0) {
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ntfs_log_error("Invalid arguments passed.\n");
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return NTFS_COLLATION_ERROR;
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}
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/*
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* FIXME: At the moment we only support COLLATION_BINARY,
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* COLLATION_NTOFS_ULONG and COLLATION_FILE_NAME so we return error
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* for everything else.
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* JPA added COLLATION_NTOFS_SECURITY_HASH
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*/
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if (cr != COLLATION_BINARY && cr != COLLATION_NTOFS_ULONG
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&& cr != COLLATION_FILE_NAME
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&& cr != COLLATION_NTOFS_SECURITY_HASH)
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goto err;
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i = le32_to_cpu(cr);
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if (i < 0)
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goto err;
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if (i <= 0x02)
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return ntfs_do_collate0x0[i](vol, data1, data1_len,
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data2, data2_len);
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if (i < 0x10)
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goto err;
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i -= 0x10;
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if (i <= 3)
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return ntfs_do_collate0x1[i](vol, data1, data1_len,
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data2, data2_len);
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err:
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ntfs_log_debug("Unknown collation rule.\n");
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return NTFS_COLLATION_ERROR;
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}
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