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/*
* Copyright (C) 1999, 2001 by Andries Brouwer
* Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <stdint.h>
#include "superblocks.h"
struct romfs_super_block {
unsigned char ros_magic[8];
uint32_t ros_full_size;
uint32_t ros_checksum;
unsigned char ros_volume[16];
} __attribute__((packed));
static int romfs_verify_csum(blkid_probe pr, const struct blkid_idmag *mag,
const struct romfs_super_block *ros)
{
uint32_t csummed_size = min((uint32_t) 512,
be32_to_cpu(ros->ros_full_size));
const unsigned char *csummed;
uint32_t csum;
if (csummed_size % sizeof(uint32_t) != 0)
return 0;
csummed = blkid_probe_get_sb_buffer(pr, mag, csummed_size);
if (!csummed)
return 0;
csum = 0;
while (csummed_size) {
csum += be32_to_cpu(*(uint32_t *) csummed);
csummed_size -= sizeof(uint32_t);
csummed += sizeof(uint32_t);
}
return blkid_probe_verify_csum(pr, csum, 0);
}
static int probe_romfs(blkid_probe pr, const struct blkid_idmag *mag)
{
const struct romfs_super_block *ros;
ros = blkid_probe_get_sb(pr, mag, struct romfs_super_block);
if (!ros)
return errno ? -errno : 1;
if (!romfs_verify_csum(pr, mag, ros))
return 1;
if (*((char *) ros->ros_volume) != '\0')
blkid_probe_set_label(pr, ros->ros_volume,
sizeof(ros->ros_volume));
blkid_probe_set_fsblocksize(pr, 1024);
blkid_probe_set_fssize(pr, be32_to_cpu(ros->ros_full_size));
blkid_probe_set_block_size(pr, 1024);
return 0;
}
const struct blkid_idinfo romfs_idinfo =
{
.name = "romfs",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_romfs,
.magics =
{
{ .magic = "-rom1fs-", .len = 8 },
{ NULL }
}
};
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