fs/oexfat/exfat_bitmap.c

/*
 *  Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
 *
 *  This program 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 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; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

/************************************************************************/
/*                                                                      */
/*  PROJECT : exFAT & FAT12/16/32 File System                           */
/*  FILE    : exfat_global.c                                            */
/*  PURPOSE : exFAT Miscellaneous Functions                             */
/*                                                                      */
/*----------------------------------------------------------------------*/
/*  NOTES                                                               */
/*                                                                      */
/*----------------------------------------------------------------------*/
/*  REVISION HISTORY (Ver 0.9)                                          */
/*                                                                      */
/*  - 2010.11.15 [Joosun Hahn] : first writing                          */
/*                                                                      */
/************************************************************************/

#include "exfat_config.h"
#include "exfat_bitmap.h"

/*----------------------------------------------------------------------*/
/*  Bitmap Manipulation Functions                                       */
/*----------------------------------------------------------------------*/

#define BITMAP_LOC(v)           ((v) >> 3)
#define BITMAP_SHIFT(v)         ((v) & 0x07)

s32 exfat_bitmap_test(u8 *bitmap, int i)
{
	u8 data;

	data = bitmap[BITMAP_LOC(i)];
	if ((data >> BITMAP_SHIFT(i)) & 0x01)
		return 1;
	return 0;
} /* end of Bitmap_test */

void exfat_bitmap_set(u8 *bitmap, int i)
{
	bitmap[BITMAP_LOC(i)] |= (0x01 << BITMAP_SHIFT(i));
} /* end of Bitmap_set */

void exfat_bitmap_clear(u8 *bitmap, int i)
{
	bitmap[BITMAP_LOC(i)] &= ~(0x01 << BITMAP_SHIFT(i));
} /* end of Bitmap_clear */