104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
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/*
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* Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/** @addtogroup lwext4
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* @{
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*/
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/**
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* @file ext4_bitmap.h
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* @brief Block/inode bitmap allocator.
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*/
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#ifndef EXT4_BITMAP_H_
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#define EXT4_BITMAP_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <ext4_config.h>
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#include <stdint.h>
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#include <stdbool.h>
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/**@brief Set bitmap bit.
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* @param bmap bitmap
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* @param bit bit to set*/
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static inline void ext4_bmap_bit_set(uint8_t *bmap, uint32_t bit)
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{
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*(bmap + (bit >> 3)) |= (1 << (bit & 7));
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}
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/**@brief Clear bitmap bit.
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* @param bmap bitmap buffer
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* @param bit bit to clear*/
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static inline void ext4_bmap_bit_clr(uint8_t *bmap, uint32_t bit)
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{
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*(bmap + (bit >> 3)) &= ~(1 << (bit & 7));
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}
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/**@brief Check if the bitmap bit is set.
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* @param bmap bitmap buffer
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* @param bit bit to check*/
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static inline bool ext4_bmap_is_bit_set(uint8_t *bmap, uint32_t bit)
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{
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return (*(bmap + (bit >> 3)) & (1 << (bit & 7)));
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}
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/**@brief Check if the bitmap bit is clear.
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* @param bmap bitmap buffer
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* @param bit bit to check*/
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static inline bool ext4_bmap_is_bit_clr(uint8_t *bmap, uint32_t bit)
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{
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return !ext4_bmap_is_bit_set(bmap, bit);
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}
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/**@brief Free range of bits in bitmap.
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* @param bmap bitmap buffer
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* @param sbit start bit
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* @param bcnt bit count*/
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void ext4_bmap_bits_free(uint8_t *bmap, uint32_t sbit, uint32_t bcnt);
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/**@brief Find first clear bit in bitmap.
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* @param sbit start bit of search
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* @param ebit end bit of search
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* @param bit_id output parameter (first free bit)
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* @return standard error code*/
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int ext4_bmap_bit_find_clr(uint8_t *bmap, uint32_t sbit, uint32_t ebit,
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uint32_t *bit_id);
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#ifdef __cplusplus
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}
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#endif
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#endif /* EXT4_BITMAP_H_ */
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/**
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* @}
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*/
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