1/*
2 * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup lwext4
30 * @{
31 */
32/**
33 * @file ext4_bitmap.h
34 * @brief Block/inode bitmap allocator.
35 */
36
37#ifndef EXT4_BITMAP_H_
38#define EXT4_BITMAP_H_
39
40#ifdef __cplusplus
41extern "C" {
42#endif
43
44#include <ext4_config.h>
45
46#include <stdint.h>
47#include <stdbool.h>
48
49/**@brief Set bitmap bit.
50 * @param bmap bitmap
51 * @param bit bit to set*/
52static inline void ext4_bmap_bit_set(uint8_t *bmap, uint32_t bit)
53{
54 *(bmap + (bit >> 3)) |= (1 << (bit & 7));
55}
56
57/**@brief Clear bitmap bit.
58 * @param bmap bitmap buffer
59 * @param bit bit to clear*/
60static inline void ext4_bmap_bit_clr(uint8_t *bmap, uint32_t bit)
61{
62 *(bmap + (bit >> 3)) &= ~(1 << (bit & 7));
63}
64
65/**@brief Check if the bitmap bit is set.
66 * @param bmap bitmap buffer
67 * @param bit bit to check*/
68static inline bool ext4_bmap_is_bit_set(uint8_t *bmap, uint32_t bit)
69{
70 return (*(bmap + (bit >> 3)) & (1 << (bit & 7)));
71}
72
73/**@brief Check if the bitmap bit is clear.
74 * @param bmap bitmap buffer
75 * @param bit bit to check*/
76static inline bool ext4_bmap_is_bit_clr(uint8_t *bmap, uint32_t bit)
77{
78 return !ext4_bmap_is_bit_set(bmap, bit);
79}
80
81/**@brief Free range of bits in bitmap.
82 * @param bmap bitmap buffer
83 * @param sbit start bit
84 * @param bcnt bit count*/
85void ext4_bmap_bits_free(uint8_t *bmap, uint32_t sbit, uint32_t bcnt);
86
87/**@brief Find first clear bit in bitmap.
88 * @param sbit start bit of search
89 * @param ebit end bit of search
90 * @param bit_id output parameter (first free bit)
91 * @return standard error code*/
92int ext4_bmap_bit_find_clr(uint8_t *bmap, uint32_t sbit, uint32_t ebit,
93 uint32_t *bit_id);
94
95#ifdef __cplusplus
96}
97#endif
98
99#endif /* EXT4_BITMAP_H_ */
100
101/**
102 * @}
103 */
104