Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * collate.c - NTFS kernel collation handling.  Part of the Linux-NTFS project.
 *
 * Copyright (c) 2004 Anton Altaparmakov
 */
 
#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;
}