/*      $NetBSD: ext2fs.c,v 1.1 2018/01/09 03:31:15 christos Exp $      */

/*-
* Copyright (c) 2017 The NetBSD Foundation, Inc.
* Copyright (c) 2016 The DragonFly Project
* Copyright (c) 2005 Stanislav Sedov
* Copyright (c) 2014 The FreeBSD Foundation
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Tomohiro Kusumi <[email protected]>.
*
* This software was developed by Edward Tomasz Napierala under sponsorship
* from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: ext2fs.c,v 1.1 2018/01/09 03:31:15 christos Exp $");

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include "fstyp.h"

#define EXT2FS_SB_OFFSET        1024
#define EXT2_SUPER_MAGIC        0xef53
#define EXT2_DYNAMIC_REV        1

typedef struct e2sb {
       uint8_t         fake1[56];
       uint16_t        s_magic;
       uint8_t         fake2[18];
       uint32_t        s_rev_level;
       uint8_t         fake3[40];
       char            s_volume_name[16];
} e2sb_t;

int
fstyp_ext2fs(FILE *fp, char *label, size_t size)
{
       e2sb_t *fs;
       char *s_volume_name;

       fs = read_buf(fp, EXT2FS_SB_OFFSET, 512);
       if (fs == NULL)
               return 1;

       /* Check for magic and versio n*/
       if (fs->s_magic == EXT2_SUPER_MAGIC &&
           fs->s_rev_level == EXT2_DYNAMIC_REV) {
               //G_LABEL_DEBUG(1, "ext2fs file system detected on %s.",
               //    pp->name);
       } else {
               free(fs);
               return 1;
       }

       s_volume_name = fs->s_volume_name;
       /* Terminate label */
       s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';

       if (s_volume_name[0] == '/')
               s_volume_name += 1;

       strlcpy(label, s_volume_name, size);
       free(fs);

       return 0;
}