/* $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 <kusumi.tomohiro@gmail.com>. * * 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; }