/*

 * Minix partition parsing code

 *

 * Copyright (C) 2009 Karel Zak <kzak@redhat.com>

 *

 * This file may be redistributed under the terms of the

 * GNU Lesser General Public License.

 */

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <stdint.h>

#include "partitions.h"

#include "minix.h"

static int probe_minix_pt(blkid_probe pr,

    const struct blkid_idmag *mag __attribute__((__unused__)))

{

  const struct dos_partition *p;

  blkid_parttable tab = NULL;

  blkid_partition parent;

  blkid_partlist ls;

  const unsigned char *data;

  int i;

  data = blkid_probe_get_sector(pr, 0);

  if (!data) {

    if (errno)

      return -errno;

    goto nothing;

  }

  ls = blkid_probe_get_partlist(pr);

  if (!ls)

    goto nothing;

  /* Parent is required, because Minix uses the same PT as DOS and

   * difference is only in primary partition (parent) type.

   */

  parent = blkid_partlist_get_parent(ls);

  if (!parent)

    goto nothing;

  if (blkid_partition_get_type(parent) != MBR_MINIX_PARTITION)

    goto nothing;

  if (blkid_partitions_need_typeonly(pr))

    /* caller does not ask for details about partitions */

    return BLKID_PROBE_OK;

  tab = blkid_partlist_new_parttable(ls, "minix", MBR_PT_OFFSET);

  if (!tab)

    goto err;

  for (i = 0, p = mbr_get_partition(data, 0);

      i < MINIX_MAXPARTITIONS; i++, p++) {

    uint32_t start, size;

    blkid_partition par;

    if (p->sys_ind != MBR_MINIX_PARTITION)

      continue;

    start = dos_partition_get_start(p);

    size = dos_partition_get_size(p);

    if (parent && !blkid_is_nested_dimension(parent, start, size)) {

      DBG(LOWPROBE, ul_debug(

        "WARNING: minix partition (%d) overflow "

        "detected, ignore", i));

      continue;

    }

    par = blkid_partlist_add_partition(ls, tab, start, size);

    if (!par)

      goto err;

    blkid_partition_set_type(par, p->sys_ind);

    blkid_partition_set_flags(par, p->boot_ind);

  }

  return BLKID_PROBE_OK;

nothing:

  return BLKID_PROBE_NONE;

err:

  return -ENOMEM;

}

/* same as DOS */

const struct blkid_idinfo minix_pt_idinfo =

{

  .name   = "minix",

  .probefunc  = probe_minix_pt,

  .magics   =

  {

    { .magic = "\x55\xAA", .len = 2, .sboff = 510 },

    { NULL }

  }

};