xref: /openbmc/linux/fs/squashfs/decompressor.h (revision 4f2c0a4acffbec01079c28f839422e64ddeff004)

/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef DECOMPRESSOR_H
#define DECOMPRESSOR_H
/*
 * Squashfs - a compressed read only filesystem for Linux
 *
 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
 * Phillip Lougher <phillip@squashfs.org.uk>
 *
 * decompressor.h
 */

#include <linux/bio.h>

struct squashfs_decompressor {
	void	*(*init)(struct squashfs_sb_info *, void *);
	void	*(*comp_opts)(struct squashfs_sb_info *, void *, int);
	void	(*free)(void *);
	int	(*decompress)(struct squashfs_sb_info *, void *,
		struct bio *, int, int, struct squashfs_page_actor *);
	int	id;
	char	*name;
	int	alloc_buffer;
	int	supported;
};

static inline void *squashfs_comp_opts(struct squashfs_sb_info *msblk,
							void *buff, int length)
{
	return msblk->decompressor->comp_opts ?
		msblk->decompressor->comp_opts(msblk, buff, length) : NULL;
}

#ifdef CONFIG_SQUASHFS_XZ
extern const struct squashfs_decompressor squashfs_xz_comp_ops;
#endif

#ifdef CONFIG_SQUASHFS_LZ4
extern const struct squashfs_decompressor squashfs_lz4_comp_ops;
#endif

#ifdef CONFIG_SQUASHFS_LZO
extern const struct squashfs_decompressor squashfs_lzo_comp_ops;
#endif

#ifdef CONFIG_SQUASHFS_ZLIB
extern const struct squashfs_decompressor squashfs_zlib_comp_ops;
#endif

#ifdef CONFIG_SQUASHFS_ZSTD
extern const struct squashfs_decompressor squashfs_zstd_comp_ops;
#endif

#endif