/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
 * io.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_IO_H
#define SQFS_IO_H

#include "sqfs/predef.h"

typedef enum {
	SQFS_FILE_OPEN_READ_ONLY = 0x01,

	SQFS_FILE_OPEN_OVERWRITE = 0x02,

	SQFS_FILE_OPEN_ALL_FLAGS = 0x03,
} E_SQFS_FILE_OPEN_FLAGS;

struct sqfs_file_t {
	void (*destroy)(sqfs_file_t *file);

	int (*read_at)(sqfs_file_t *file, uint64_t offset,
		       void *buffer, size_t size);

	int (*write_at)(sqfs_file_t *file, uint64_t offset,
			const void *buffer, size_t size);

	uint64_t (*get_size)(sqfs_file_t *file);

	int (*truncate)(sqfs_file_t *file, uint64_t size);
};

#ifdef __cplusplus
extern "C" {
#endif

SQFS_API sqfs_file_t *sqfs_open_file(const char *filename, int flags);

#ifdef __cplusplus
}
#endif

#endif /* SQFS_IO_H */