/*

 * 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 }

  }

};