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_DECOMPRESSOR_H
9 #define SQFS_DECOMPRESSOR_H
10 
11 #include <stdint.h>
12 #include "sqfs_filesystem.h"
13 
14 #define SQFS_COMP_ZLIB 1
15 #define SQFS_COMP_LZMA 2
16 #define SQFS_COMP_LZO 3
17 #define SQFS_COMP_XZ 4
18 #define SQFS_COMP_LZ4 5
19 #define SQFS_COMP_ZSTD 6
20 
21 /* LZMA does not support any compression options */
22 
23 struct squashfs_gzip_opts {
24 	u32 compression_level;
25 	u16 window_size;
26 	u16 strategies;
27 };
28 
29 struct squashfs_xz_opts {
30 	u32 dictionary_size;
31 	u32 executable_filters;
32 };
33 
34 struct squashfs_lz4_opts {
35 	u32 version;
36 	u32 flags;
37 };
38 
39 struct squashfs_zstd_opts {
40 	u32 compression_level;
41 };
42 
43 struct squashfs_lzo_opts {
44 	u32 algorithm;
45 	u32 level;
46 };
47 
48 union squashfs_compression_opts {
49 	struct squashfs_gzip_opts *gzip;
50 	struct squashfs_xz_opts *xz;
51 	struct squashfs_lz4_opts *lz4;
52 	struct squashfs_zstd_opts *zstd;
53 	struct squashfs_lzo_opts *lzo;
54 };
55 
56 int sqfs_decompress(struct squashfs_ctxt *ctxt, void *dest,
57 		    unsigned long *dest_len, void *source, u32 src_len);
58 int sqfs_decompressor_init(struct squashfs_ctxt *ctxt);
59 void sqfs_decompressor_cleanup(struct squashfs_ctxt *ctxt);
60 
61 #endif /* SQFS_DECOMPRESSOR_H */
62