92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
/*-
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* Copyright (c) 2005 Stanislav Sedov
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* Copyright (c) 2014 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "fstyp.h"
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#define EXT2FS_SB_OFFSET 1024
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#define EXT2_SUPER_MAGIC 0xef53
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#define EXT2_DYNAMIC_REV 1
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typedef struct e2sb {
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uint8_t fake1[56];
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uint16_t s_magic;
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uint8_t fake2[18];
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uint32_t s_rev_level;
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uint8_t fake3[40];
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char s_volume_name[16];
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} e2sb_t;
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int
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fstyp_ext2fs(FILE *fp, char *label, size_t size)
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{
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e2sb_t *fs;
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char *s_volume_name;
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fs = (e2sb_t *)read_buf(fp, EXT2FS_SB_OFFSET, 512);
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if (fs == NULL)
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return (1);
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/* Check for magic and versio n*/
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if (fs->s_magic == EXT2_SUPER_MAGIC &&
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fs->s_rev_level == EXT2_DYNAMIC_REV) {
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//G_LABEL_DEBUG(1, "ext2fs file system detected on %s.",
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// pp->name);
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} else {
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free(fs);
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return (1);
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}
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s_volume_name = fs->s_volume_name;
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/* Terminate label */
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s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
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if (s_volume_name[0] == '/')
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s_volume_name += 1;
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/* Check for volume label */
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if (s_volume_name[0] == '\0') {
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free(fs);
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return (1);
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}
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strlcpy(label, s_volume_name, size);
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free(fs);
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return (0);
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}
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