usbloadergx/source/libntfs/bitmap.h

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/*
* bitmap.h - Exports for bitmap handling. Originated from 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 NTFS-3G
* 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.
*/
extern void ntfs_bit_set( u8 *bitmap, const u64 bit, const u8 new_value );
extern char ntfs_bit_get( const u8 *bitmap, const u64 bit );
extern char ntfs_bit_get_and_set( u8 *bitmap, const u64 bit, const u8 new_value );
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 );
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/**
* ntfs_bitmap_set_bit - set a bit in a bitmap
* @na: attribute containing the bitmap
* @bit: bit to set
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*
* 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 );
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}
/**
* ntfs_bitmap_clear_bit - clear a bit in a bitmap
* @na: attribute containing the bitmap
* @bit: bit to clear
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*
* 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 );
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}
/*
* rol32 - rotate a 32-bit value left
*
* @word: value to rotate
* @shift: bits to roll
*/
static __inline__ u32 ntfs_rol32( u32 word, unsigned int shift )
{
return ( word << shift ) | ( word >> ( 32 - shift ) );
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}
/*
* ror32 - rotate a 32-bit value right
*
* @word: value to rotate
* @shift: bits to roll
*/
static __inline__ u32 ntfs_ror32( u32 word, unsigned int shift )
{
return ( word >> shift ) | ( word << ( 32 - shift ) );
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}
#endif /* defined _NTFS_BITMAP_H */