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97 lines
2.9 KiB
C
97 lines
2.9 KiB
C
/*
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* bitmap.h - Exports for bitmap handling. Originated from the Linux-NTFS project.
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*
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* Copyright (c) 2000-2004 Anton Altaparmakov
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* Copyright (c) 2004-2005 Richard Russon
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the NTFS-3G
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _NTFS_BITMAP_H
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#define _NTFS_BITMAP_H
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#include "types.h"
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#include "attrib.h"
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/*
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* NOTES:
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*
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* - Operations are 8-bit only to ensure the functions work both on little
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* and big endian machines! So don't make them 32-bit ops!
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* - bitmap starts at bit = 0 and ends at bit = bitmap size - 1.
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* - _Caller_ has to make sure that the bit to operate on is less than the
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* size of the bitmap.
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*/
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extern void ntfs_bit_set(u8 *bitmap, const u64 bit, const u8 new_value);
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extern char ntfs_bit_get(const u8 *bitmap, const u64 bit);
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extern char ntfs_bit_get_and_set(u8 *bitmap, const u64 bit, const u8 new_value);
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extern int ntfs_bitmap_set_run(ntfs_attr *na, s64 start_bit, s64 count);
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extern int ntfs_bitmap_clear_run(ntfs_attr *na, s64 start_bit, s64 count);
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/**
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* ntfs_bitmap_set_bit - set a bit in a bitmap
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* @na: attribute containing the bitmap
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* @bit: bit to set
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*
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* Set the @bit in the bitmap described by the attribute @na.
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*
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* On success return 0 and on error return -1 with errno set to the error code.
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*/
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static __inline__ int ntfs_bitmap_set_bit(ntfs_attr *na, s64 bit)
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{
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return ntfs_bitmap_set_run(na, bit, 1);
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}
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/**
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* ntfs_bitmap_clear_bit - clear a bit in a bitmap
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* @na: attribute containing the bitmap
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* @bit: bit to clear
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*
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* Clear @bit in the bitmap described by the attribute @na.
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*
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* On success return 0 and on error return -1 with errno set to the error code.
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*/
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static __inline__ int ntfs_bitmap_clear_bit(ntfs_attr *na, s64 bit)
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{
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return ntfs_bitmap_clear_run(na, bit, 1);
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}
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/*
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* rol32 - rotate a 32-bit value left
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*
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* @word: value to rotate
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* @shift: bits to roll
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*/
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static __inline__ u32 ntfs_rol32(u32 word, unsigned int shift)
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{
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return (word << shift) | (word >> (32 - shift));
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}
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/*
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* ror32 - rotate a 32-bit value right
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*
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* @word: value to rotate
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* @shift: bits to roll
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*/
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static __inline__ u32 ntfs_ror32(u32 word, unsigned int shift)
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{
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return (word >> shift) | (word << (32 - shift));
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}
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#endif /* defined _NTFS_BITMAP_H */
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