1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (C) 2020 Bootlin
4  *
5  * Author: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
6  */
7 
8 #ifndef SQFS_UTILS_H
9 #define SQFS_UTILS_H
10 
11 #include <linux/bitops.h>
12 #include <linux/kernel.h>
13 #include <stdbool.h>
14 
15 #define SQFS_FRAGMENT_INDEX_OFFSET(A) ((A) % SQFS_MAX_ENTRIES)
16 #define SQFS_FRAGMENT_INDEX(A) ((A) / SQFS_MAX_ENTRIES)
17 #define SQFS_BLOCK_SIZE(A) ((A) & GENMASK(23, 0))
18 /* Useful for both fragment and data blocks */
19 #define SQFS_COMPRESSED_BLOCK(A) (!((A) & BIT(24)))
20 #define SQFS_IS_FRAGMENTED(A) ((A) != 0xFFFFFFFF)
21 /*
22  * These two macros work as getters for a metada block header, retrieving the
23  * data size and if it is compressed/uncompressed
24  */
25 #define SQFS_COMPRESSED_METADATA(A) (!((A) & BIT(15)))
26 #define SQFS_METADATA_SIZE(A) ((A) & GENMASK(14, 0))
27 
28 #endif /* SQFS_UTILS_H  */
29