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asfs.c

/*
    asfs.c -- parted asfs filesystem support
    Copyright (C) 1998-2000 Free Software Foundation, Inc.
  
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "config.h"

#include <stdlib.h>
#include <string.h>
#include <parted/parted.h>
#include <parted/debug.h>
#include <parted/endian.h>

#include "amiga.h"
#include "asfs.h"

#if ENABLE_NLS
#  include <libintl.h>
#  define _(String) dgettext (PACKAGE, String)
#else
#  define _(String) (String)
#endif /* ENABLE_NLS */

static int
_asfs_probe_root (PedGeometry *geom, uint32_t *block, int blocksize, PedSector root) {
      int i, sum;
      PedSector start, end;

      if (PED_BE32_TO_CPU (block[0]) != 0x53465300) return 0;
      for (i = 0, sum = 1; i < 128*blocksize; i++) sum += PED_BE32_TO_CPU (block[i]);
      if (sum != 0) return 0;
      if (PED_BE32_TO_CPU (block[2]) * blocksize + geom->start != root) {
            return 0;
      }
      start = ((((PedSector) PED_BE32_TO_CPU (block[8])) << 32)
            + (PedSector) PED_BE32_TO_CPU (block[9])) / 512;
      end = (((((PedSector) PED_BE32_TO_CPU (block[10])) << 32)
            + (PedSector) PED_BE32_TO_CPU (block[11])) / 512) - 1;
      if (start != geom->start || end != geom->end) return 0;
      return 1;
}

static PedGeometry*
_asfs_probe (PedGeometry* geom)
{
      uint32_t *block;
      struct PartitionBlock * part;
      int blocksize = 1, reserved = 1, prealloc = 1;
      PedSector root, root2;
      int found = 0;

      PED_ASSERT (geom != NULL, return NULL);
      PED_ASSERT (geom->dev != NULL, return NULL);

      /* Finds the blocksize, prealloc and reserved values of the partition block */
      if (!(part = ped_malloc (PED_SECTOR_SIZE*blocksize))) {
            ped_exception_throw(PED_EXCEPTION_ERROR, PED_EXCEPTION_CANCEL,
                  _("%s : Failed to allocate partition block\n"), __func__);
            goto error_part;
      }
      if (amiga_find_part(geom, part) != NULL) {
            prealloc = PED_BE32_TO_CPU (part->de_PreAlloc) == 0 ?
                  1 : PED_BE32_TO_CPU (part->de_PreAlloc);
            reserved = PED_BE32_TO_CPU (part->de_Reserved) == 0 ?
                  1 : PED_BE32_TO_CPU (part->de_Reserved);
            blocksize = PED_BE32_TO_CPU (part->de_SizeBlock)
                  * PED_BE32_TO_CPU (part->de_SectorPerBlock) / 128;
      }
      ped_free (part);

      /* Test boot block */
      if (!(block = ped_malloc (PED_SECTOR_SIZE*blocksize))) {
            ped_exception_throw(PED_EXCEPTION_ERROR, PED_EXCEPTION_CANCEL,
                  _("%s : Failed to allocate block\n"), __func__);
            goto error_block;
      }
      root = geom->start;
      if (!ped_device_read (geom->dev, block, root, blocksize)) {
            ped_exception_throw(PED_EXCEPTION_ERROR, PED_EXCEPTION_CANCEL,
                  _("%s : Couldn't read root block %llu\n"), __func__, root);
            goto error;
      }
      if (PED_BE32_TO_CPU (block[0]) != 0x53465300) {
            goto error;
      }

      /* Find and test the root blocks */
      if (_asfs_probe_root(geom, block, blocksize, root)) {
            found++;
      }
      root = geom->end - blocksize - (geom->length % blocksize) + 1;
      if (!ped_device_read (geom->dev, block, root, 1)) {
            ped_exception_throw(PED_EXCEPTION_ERROR, PED_EXCEPTION_CANCEL,
                  _("%s : Couldn't read root block %llu\n"), __func__, root);
            goto error;
      }
      if (_asfs_probe_root(geom, block, blocksize, root)) {
            found++;
      }
      if (found != 0) {
            ped_free (block);
            return ped_geometry_duplicate (geom);
      }

error:
      ped_free (block);
error_block:
error_part:
      return NULL;
}

static PedFileSystemOps _asfs_ops = {
      probe:            _asfs_probe,
      clobber:    NULL,
      open:       NULL,
      create:         NULL,
      close:            NULL,
      check:          NULL,
      resize:           NULL,
      copy:           NULL,
      get_create_constraint:  NULL,
      get_copy_constraint:    NULL,
      get_resize_constraint:  NULL
};

PedFileSystemType _asfs_type = {
       next:             NULL,
       ops:        &_asfs_ops,
       name:             "asfs"
};

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