/usr/include/ntfs/bitmap.h is in libntfs-dev 2.0.0-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* bitmap.h - Exports for bitmap handling. Part of the Linux-NTFS project.
*
* Copyright (c) 2000-2004 Anton Altaparmakov
* Copyright (c) 2004-2005 Richard Russon
*
* 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
*/
#ifndef _NTFS_BITMAP_H
#define _NTFS_BITMAP_H
#include "types.h"
#include "attrib.h"
/*
* NOTES:
*
* - Operations are 8-bit only to ensure the functions work both on little
* and big endian machines! So don't make them 32-bit ops!
* - bitmap starts at bit = 0 and ends at bit = bitmap size - 1.
* - _Caller_ has to make sure that the bit to operate on is less than the
* size of the bitmap.
*/
/**
* ntfs_bit_set - set a bit in a field of bits
* @bitmap: field of bits
* @bit: bit to set
* @new_value: value to set bit to (0 or 1)
*
* Set the bit @bit in the @bitmap to @new_value. Ignore all errors.
*/
static __inline__ void ntfs_bit_set(u8 *bitmap, const u64 bit,
const u8 new_value)
{
if (!bitmap || new_value > 1)
return;
if (!new_value)
bitmap[bit >> 3] &= ~(1 << (bit & 7));
else
bitmap[bit >> 3] |= (1 << (bit & 7));
}
/**
* ntfs_bit_get - get value of a bit in a field of bits
* @bitmap: field of bits
* @bit: bit to get
*
* Get and return the value of the bit @bit in @bitmap (0 or 1).
* Return -1 on error.
*/
static __inline__ char ntfs_bit_get(const u8 *bitmap, const u64 bit)
{
if (!bitmap)
return -1;
return (bitmap[bit >> 3] >> (bit & 7)) & 1;
}
static __inline__ void ntfs_bit_change(u8 *bitmap, const u64 bit)
{
if (!bitmap)
return;
bitmap[bit >> 3] ^= 1 << (bit & 7);
}
/**
* ntfs_bit_get_and_set - get value of a bit in a field of bits and set it
* @bitmap: field of bits
* @bit: bit to get/set
* @new_value: value to set bit to (0 or 1)
*
* Return the value of the bit @bit and set it to @new_value (0 or 1).
* Return -1 on error.
*/
static __inline__ char ntfs_bit_get_and_set(u8 *bitmap, const u64 bit,
const u8 new_value)
{
register u8 old_bit, shift;
if (!bitmap || new_value > 1)
return -1;
shift = bit & 7;
old_bit = (bitmap[bit >> 3] >> shift) & 1;
if (new_value != old_bit)
bitmap[bit >> 3] ^= 1 << shift;
return old_bit;
}
extern int ntfs_bitmap_set_run(ntfs_attr *na, s64 start_bit, s64 count);
extern int ntfs_bitmap_clear_run(ntfs_attr *na, s64 start_bit, s64 count);
/**
* ntfs_bitmap_set_bit - set a bit in a bitmap
* @na: attribute containing the bitmap
* @bit: bit to set
*
* Set the @bit in the bitmap described by the attribute @na.
*
* On success return 0 and on error return -1 with errno set to the error code.
*/
static __inline__ int ntfs_bitmap_set_bit(ntfs_attr *na, s64 bit)
{
return ntfs_bitmap_set_run(na, bit, 1);
}
/**
* ntfs_bitmap_clear_bit - clear a bit in a bitmap
* @na: attribute containing the bitmap
* @bit: bit to clear
*
* Clear @bit in the bitmap described by the attribute @na.
*
* On success return 0 and on error return -1 with errno set to the error code.
*/
static __inline__ int ntfs_bitmap_clear_bit(ntfs_attr *na, s64 bit)
{
return ntfs_bitmap_clear_run(na, bit, 1);
}
#endif /* defined _NTFS_BITMAP_H */
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