64 lines
2.7 KiB
C
64 lines
2.7 KiB
C
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/*
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* 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; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/************************************************************************/
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/* */
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/* PROJECT : exFAT & FAT12/16/32 File System */
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/* FILE : exfat_global.c */
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/* PURPOSE : exFAT Miscellaneous Functions */
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/* */
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/*----------------------------------------------------------------------*/
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/* NOTES */
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/* */
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/*----------------------------------------------------------------------*/
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/* REVISION HISTORY (Ver 0.9) */
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/* */
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/* - 2010.11.15 [Joosun Hahn] : first writing */
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/* */
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/************************************************************************/
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#include "exfat_config.h"
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#include "exfat_bitmap.h"
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/*----------------------------------------------------------------------*/
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/* Bitmap Manipulation Functions */
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/*----------------------------------------------------------------------*/
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#define BITMAP_LOC(v) ((v) >> 3)
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#define BITMAP_SHIFT(v) ((v) & 0x07)
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s32 exfat_bitmap_test(u8 *bitmap, int i)
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{
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u8 data;
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data = bitmap[BITMAP_LOC(i)];
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if ((data >> BITMAP_SHIFT(i)) & 0x01)
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return 1;
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return 0;
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} /* end of Bitmap_test */
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void exfat_bitmap_set(u8 *bitmap, int i)
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{
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bitmap[BITMAP_LOC(i)] |= (0x01 << BITMAP_SHIFT(i));
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} /* end of Bitmap_set */
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void exfat_bitmap_clear(u8 *bitmap, int i)
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{
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bitmap[BITMAP_LOC(i)] &= ~(0x01 << BITMAP_SHIFT(i)); /* [false alarm]:native code*/
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} /* end of Bitmap_clear */
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