272 lines
6.1 KiB
C
272 lines
6.1 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_STDLIB_H
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#include <stdlib.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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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include "attrib.h"
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#include "index.h"
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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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/**
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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_ulongs - Which of two le32 arrays should be listed first
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*
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* Returns: -1, 0 or 1 depending of how the arrays compare
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*/
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static int ntfs_collate_ntofs_ulongs(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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int len;
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const le32 *p1, *p2;
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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 <= 0) || (data1_len & 3)) {
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ntfs_log_error("data1_len or data2_len not valid\n");
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return NTFS_COLLATION_ERROR;
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}
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p1 = (const le32*)data1;
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p2 = (const le32*)data2;
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len = data1_len;
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do {
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d1 = le32_to_cpup(p1);
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p1++;
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d2 = le32_to_cpup(p2);
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p2++;
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} while ((d1 == d2) && ((len -= 4) > 0));
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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 le32 *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 le32*)data1;
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p2 = (const le32*)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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p1++;
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p2++;
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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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const FILE_NAME_ATTR *file_name_attr1;
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const FILE_NAME_ATTR *file_name_attr2;
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int rc;
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ntfs_log_trace("Entering.\n");
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file_name_attr1 = (const FILE_NAME_ATTR*)data1;
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file_name_attr2 = (const FILE_NAME_ATTR*)data2;
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rc = ntfs_names_full_collate(
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(ntfschar*)&file_name_attr1->file_name,
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file_name_attr1->file_name_length,
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(ntfschar*)&file_name_attr2->file_name,
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file_name_attr2->file_name_length,
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CASE_SENSITIVE, 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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/*
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* Get a pointer to appropriate collation function.
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*
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* Returns NULL if the needed function is not implemented
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*/
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COLLATE ntfs_get_collate_function(COLLATION_RULES cr)
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{
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COLLATE collate;
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switch (cr) {
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case COLLATION_BINARY :
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collate = ntfs_collate_binary;
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break;
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case COLLATION_FILE_NAME :
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collate = ntfs_collate_file_name;
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break;
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case COLLATION_NTOFS_SECURITY_HASH :
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collate = ntfs_collate_ntofs_security_hash;
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break;
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case COLLATION_NTOFS_ULONG :
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collate = ntfs_collate_ntofs_ulong;
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break;
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case COLLATION_NTOFS_ULONGS :
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collate = ntfs_collate_ntofs_ulongs;
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break;
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default :
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errno = EOPNOTSUPP;
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collate = (COLLATE)NULL;
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break;
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}
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return (collate);
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}
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