source: MondoRescue/branches/3.2/mindi-busybox/util-linux/volume_id/romfs.c

/*
 * volume_id - reads filesystem label and uuid
 *
 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
 *
 *  This library 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 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "volume_id_internal.h"

struct romfs_super {
    uint8_t magic[8];
    uint32_t size;
    uint32_t checksum;
    uint8_t name[];
} PACKED;

int FAST_FUNC volume_id_probe_romfs(struct volume_id *id /*,uint64_t off*/)
{
#define off ((uint64_t)0)
    struct romfs_super *rfs;

    dbg("probing at offset 0x%llx", (unsigned long long) off);

    rfs = volume_id_get_buffer(id, off, 0x200);
    if (rfs == NULL)
        return -1;

    if (memcmp(rfs->magic, "-rom1fs-", 4) == 0) {
        size_t len = strlen((char *)rfs->name);

        if (len) {
//          volume_id_set_label_raw(id, rfs->name, len);
            volume_id_set_label_string(id, rfs->name, len);
        }

//      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
        IF_FEATURE_BLKID_TYPE(id->type = "romfs";)
        return 0;
    }

    return -1;
}