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/*
libparted - a library for manipulating disk partitions
Copyright (C) 2004-2005, 2007, 2009-2014, 2019-2022 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <parted/parted.h>
#include <parted/endian.h>
#include <parted/debug.h>
#include <stdint.h>
#if ENABLE_NLS
# include <libintl.h>
# define _(String) dgettext (PACKAGE, String)
#else
# define _(String) (String)
#endif /* ENABLE_NLS */
#include "hfs.h"
#include "probe.h"
int
hfsc_can_use_geom (PedGeometry* geom)
{
PedDevice* dev;
dev = geom->dev;
PED_ASSERT (geom != NULL);
PED_ASSERT (dev != NULL);
if (dev->sector_size != PED_SECTOR_SIZE_DEFAULT) {
ped_exception_throw (
PED_EXCEPTION_ERROR,
PED_EXCEPTION_CANCEL,
_("Parted can't use HFS file systems on disks "
"with a sector size not equal to %d bytes."),
(int)PED_SECTOR_SIZE_DEFAULT );
return 0;
}
return 1;
}
/* Probe an HFS volume, detecting it even if
it is in fact a wrapper to an HFS+ volume */
/* Used by hfsplus_probe and hfs_probe */
PedGeometry*
hfs_and_wrapper_probe (PedGeometry* geom)
{
HfsMasterDirectoryBlock *mdb;
PedGeometry* geom_ret;
PedSector search, max;
PED_ASSERT (geom != NULL);
PED_ASSERT (hfsc_can_use_geom (geom));
const int sectors = ((3 * 512) + geom->dev->sector_size - 1) /
geom->dev->sector_size;
char * buf = alloca (sectors * geom->dev->sector_size);
mdb = (HfsMasterDirectoryBlock *)(buf+1024);
/* is 5 an intelligent value ? */
if ((geom->length < 5)
|| (!ped_geometry_read (geom, buf, 0, sectors))
|| (mdb->signature != PED_CPU_TO_BE16 (HFS_SIGNATURE)) )
return NULL;
search = ((PedSector) PED_BE16_TO_CPU (mdb->start_block)
+ ((PedSector) PED_BE16_TO_CPU (mdb->total_blocks)
* (PED_BE32_TO_CPU (mdb->block_size) / geom->dev->sector_size)));
max = search + (PED_BE32_TO_CPU (mdb->block_size) / geom->dev->sector_size);
if ((search < 0)
|| !(geom_ret = ped_geometry_new (geom->dev, geom->start, search + 2)))
return NULL;
for (; search < max; search++) {
if (!ped_geometry_set (geom_ret, geom_ret->start, search + 2)
|| !ped_geometry_read (geom_ret, buf, search, 1))
break;
if (mdb->signature == PED_CPU_TO_BE16 (HFS_SIGNATURE))
return geom_ret;
}
ped_geometry_destroy (geom_ret);
return NULL;
}
PedGeometry*
hfsplus_probe (PedGeometry* geom)
{
PedGeometry* geom_ret;
uint8_t buf[PED_SECTOR_SIZE_DEFAULT];
PED_ASSERT (geom != NULL);
if (!hfsc_can_use_geom (geom))
return NULL;
if ((geom_ret = hfs_and_wrapper_probe(geom))) {
/* HFS+ is embedded in an HFS volume ? */
HfsMasterDirectoryBlock *mdb;
mdb = (HfsMasterDirectoryBlock *) buf;
if (!ped_geometry_read (geom, buf, 2, 1)
|| (mdb->old_new.embedded.signature
!= PED_CPU_TO_BE16 (HFSP_SIGNATURE))) {
ped_geometry_destroy (geom_ret);
return NULL;
} else
return geom_ret;
} else {
/* This is a standalone HFS+ volume ? */
PedSector search, max;
HfsPVolumeHeader *vh;
vh = (HfsPVolumeHeader *) buf;
if ((geom->length < 5)
|| !ped_geometry_read (geom, buf, 2, 1)
|| (vh->signature != PED_CPU_TO_BE16 (HFSP_SIGNATURE)))
return NULL;
/* Correct range is indeed [ blocks*sz-2;(blocs+1)*sz-2 ( */
/* But previous versions of my implementation used to */
/* assume range is [(blocks-1)*sz-1;(blocks*sz) ( */
/* (blocks-1)*sz-1 has to be scanned last, because */
/* it can belong to a regular file */
max = ((PedSector) PED_BE32_TO_CPU (vh->total_blocks) + 1)
* ( PED_BE32_TO_CPU (vh->block_size) / PED_SECTOR_SIZE_DEFAULT )
- 2;
search = max - 2 * ( PED_BE32_TO_CPU (vh->block_size)
/ PED_SECTOR_SIZE_DEFAULT ) + 2;
if ((search < 0)
|| !(geom_ret = ped_geometry_new (geom->dev, geom->start,
search + 2)))
return NULL;
for (; search < max; search++) {
if (!ped_geometry_set (geom_ret, geom_ret->start,
search + 2)
|| !ped_geometry_read (geom_ret, buf, search, 1))
break;
if (vh->signature == PED_CPU_TO_BE16 (HFSP_SIGNATURE))
return geom_ret;
}
search = ((PedSector) PED_BE32_TO_CPU (vh->total_blocks) - 1)
* ( PED_BE32_TO_CPU (vh->block_size) / PED_SECTOR_SIZE_DEFAULT )
- 1;
if ((search < 0)
|| !ped_geometry_set (geom_ret, geom_ret->start,
search + 2)
|| !ped_geometry_read (geom_ret, buf, search, 1)
|| vh->signature != PED_CPU_TO_BE16 (HFSP_SIGNATURE)) {
ped_geometry_destroy (geom_ret);
return NULL;
} else
return geom_ret;
}
}
PedGeometry*
hfs_probe (PedGeometry* geom)
{
PedGeometry* geom_base;
PedGeometry* geom_plus = NULL;
PED_ASSERT (geom != NULL);
if (!hfsc_can_use_geom (geom))
return NULL;
if ((geom_base = hfs_and_wrapper_probe(geom))
&& (!(geom_plus = hfsplus_probe(geom_base))))
return geom_base;
else {
if (geom_base) ped_geometry_destroy (geom_base);
if (geom_plus) ped_geometry_destroy (geom_plus);
return NULL;
}
}
PedGeometry*
hfsx_probe (PedGeometry* geom)
{
PedGeometry* geom_ret;
uint8_t buf[PED_SECTOR_SIZE_DEFAULT];
PedSector search, max;
HfsPVolumeHeader *vh = (HfsPVolumeHeader *) buf;
PED_ASSERT (geom != NULL);
if (!hfsc_can_use_geom (geom))
return NULL;
if ((geom->length < 5)
|| !ped_geometry_read (geom, buf, 2, 1)
|| (vh->signature != PED_CPU_TO_BE16 (HFSX_SIGNATURE)))
return NULL;
/* unlike the hfs+ code, which should be kept compatible
with my old previous implementations, we only care here
about legal alternate VH positions, like TN1150 describes them */
max = ((PedSector) PED_BE32_TO_CPU (vh->total_blocks) + 1)
* ( PED_BE32_TO_CPU (vh->block_size) / PED_SECTOR_SIZE_DEFAULT )
- 2;
search = max - ( PED_BE32_TO_CPU (vh->block_size) / PED_SECTOR_SIZE_DEFAULT );
if ((search < 0)
|| !(geom_ret = ped_geometry_new (geom->dev, geom->start,
search + 2)))
return NULL;
for (; search < max; search++) {
if (!ped_geometry_set (geom_ret, geom_ret->start,
search + 2)
|| !ped_geometry_read (geom_ret, buf, search, 1))
break;
if (vh->signature == PED_CPU_TO_BE16 (HFSX_SIGNATURE))
return geom_ret;
}
ped_geometry_destroy (geom_ret);
return NULL;
}
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