a1d312de77
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 43 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520075212.517001706@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
111 lines
2.8 KiB
C
111 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* collate.c - NTFS kernel collation handling. Part of the Linux-NTFS project.
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*
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* Copyright (c) 2004 Anton Altaparmakov
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*/
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#include "collate.h"
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#include "debug.h"
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#include "ntfs.h"
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static int ntfs_collate_binary(ntfs_volume *vol,
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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_debug("Entering.");
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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_debug("Done, returning %i", rc);
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return rc;
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}
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static int ntfs_collate_ntofs_ulong(ntfs_volume *vol,
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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_debug("Entering.");
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// FIXME: We don't really want to bug here.
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BUG_ON(data1_len != data2_len);
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BUG_ON(data1_len != 4);
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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_debug("Done, returning %i", 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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NULL/*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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NULL/*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, ir 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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int ntfs_collate(ntfs_volume *vol, COLLATION_RULE 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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int i;
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ntfs_debug("Entering.");
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/*
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* FIXME: At the moment we only support COLLATION_BINARY and
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* COLLATION_NTOFS_ULONG, so we BUG() for everything else for now.
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*/
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BUG_ON(cr != COLLATION_BINARY && cr != COLLATION_NTOFS_ULONG);
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i = le32_to_cpu(cr);
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BUG_ON(i < 0);
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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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BUG_ON(i < 0x10);
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i -= 0x10;
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if (likely(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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BUG();
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return 0;
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}
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