linux/fs/ntfs3/bitfunc.c

// SPDX-License-Identifier: GPL-2.0
/*
 *
 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
 *
 */

#include <linux/types.h>

#include "ntfs_fs.h"

#define BITS_IN_SIZE_T …

/*
 * fill_mask[i] - first i bits are '1' , i = 0,1,2,3,4,5,6,7,8
 * fill_mask[i] = 0xFF >> (8-i)
 */
static const u8 fill_mask[] = …;

/*
 * zero_mask[i] - first i bits are '0' , i = 0,1,2,3,4,5,6,7,8
 * zero_mask[i] = 0xFF << i
 */
static const u8 zero_mask[] = …;

/*
 * are_bits_clear
 *
 * Return: True if all bits [bit, bit+nbits) are zeros "0".
 */
bool are_bits_clear(const void *lmap, size_t bit, size_t nbits)
{ … }

/*
 * are_bits_set
 *
 * Return: True if all bits [bit, bit+nbits) are ones "1".
 */
bool are_bits_set(const void *lmap, size_t bit, size_t nbits)
{ … }