/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
 * data.h - This file is part of libsquashfs
 *
 * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#ifndef SQFS_DATA_H
#define SQFS_DATA_H

#include "sqfs/predef.h"

/**
 * @file data.h
 *
 * @brief Contains on-disk data structures for data block management
 *        and helper macros.
 */

#define SQFS_META_BLOCK_SIZE 8192

#define SQFS_IS_BLOCK_COMPRESSED(size) (((size) & (1 << 24)) == 0)
#define SQFS_ON_DISK_BLOCK_SIZE(size) ((size) & ((1 << 24) - 1))
#define SQFS_IS_SPARSE_BLOCK(size) (SQFS_ON_DISK_BLOCK_SIZE(size) == 0)

/**
 * @struct sqfs_fragment_t
 *
 * @brief Data structure that makes up the fragment table entries.
 */
struct sqfs_fragment_t {
	/**
	 * @brief Location of the fragment block on-disk.
	 */
	uint64_t start_offset;

	/**
	 * @brief Size of the fragment block in bytes.
	 */
	uint32_t size;

	/**
	 * @brief Unused. Always initialize this to 0.
	 */
	uint32_t pad0;
};

#endif /* SQFS_DATA_H */