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/*
File: ntfsp.c
Copyright (C) 2007-2008 Christophe GRENIER <grenier@cgsecurity.org>
This software 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 the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#if defined(DISABLED_FOR_FRAMAC)
#undef HAVE_LIBNTFS
#undef HAVE_LIBNTFS3G
#endif
#if defined(HAVE_LIBNTFS) || defined(HAVE_LIBNTFS3G)
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_ICONV_H
#include <iconv.h>
#endif
#include "types.h"
#include "common.h"
#include "list.h"
#include "filegen.h"
#include "photorec.h"
#ifdef HAVE_LIBNTFS
#include <ntfs/attrib.h>
#endif
#ifdef HAVE_LIBNTFS3G
#include <ntfs-3g/attrib.h>
#endif
#include "ntfsp.h"
#include "intrf.h"
#include "dir.h"
#include "ntfs.h"
#include "ntfs_dir.h"
#include "ntfs_inc.h"
#include "log.h"
#include "log_part.h"
#define SIZEOF_BUFFER ((const unsigned int)512)
unsigned int ntfs_remove_used_space(disk_t *disk_car,const partition_t *partition, alloc_data_t *list_search_space)
{
dir_data_t dir_data;
switch(dir_partition_ntfs_init(disk_car, partition, &dir_data, 0, 0))
{
case DIR_PART_ENOIMP:
case DIR_PART_ENOSYS:
return 0;
case DIR_PART_EIO:
log_partition(disk_car,partition);
log_error("Can't open filesystem. Filesystem seems damaged.\n");
return 0;
case DIR_PART_OK:
break;
}
{
struct ntfs_dir_struct *ls=(struct ntfs_dir_struct *)dir_data.private_dir_data;
unsigned char *buffer;
uint64_t start_free=0;
uint64_t end_free=0;
unsigned long int lcn;
unsigned long int no_of_cluster;
unsigned int cluster_size; /* size in bytes */
/* Which bit of $Bitmap is in the buffer */
long long int bmplcn = - (SIZEOF_BUFFER << 3);
log_trace("ntfs_remove_used_space\n");
buffer=(unsigned char *)MALLOC(SIZEOF_BUFFER);
{
const struct ntfs_boot_sector*ntfs_header=(const struct ntfs_boot_sector*)buffer;
if(disk_car->pread(disk_car, buffer, 512, partition->part_offset) != 512)
{
free(buffer);
dir_data.close(&dir_data);
return 0;
}
cluster_size=ntfs_header->sectors_per_cluster*ntfs_sector_size(ntfs_header);
if(cluster_size==0)
{
free(buffer);
dir_data.close(&dir_data);
return 0;
}
no_of_cluster=(le64(ntfs_header->sectors_nbr) < partition->part_size ? le64(ntfs_header->sectors_nbr) : partition->part_size);
no_of_cluster/=ntfs_header->sectors_per_cluster;
}
for(lcn=0;lcn<no_of_cluster;lcn++)
{
int byte, bit;
if ((bmplcn < 0) || (lcn < (unsigned)bmplcn) || (lcn >= ((unsigned)bmplcn + (SIZEOF_BUFFER << 3))))
{
ntfs_attr *attr;
/* Mark the buffer as not in use, in case the read is shorter. */
memset(buffer, 0x00, SIZEOF_BUFFER);
bmplcn = lcn & (~((SIZEOF_BUFFER << 3) - 1));
attr = ntfs_attr_open(ls->vol->lcnbmp_ni, AT_DATA, AT_UNNAMED, 0);
if(attr==NULL)
{
log_error("Couldn't open $Bitmap\n");
free(buffer);
dir_data.close(&dir_data);
return 0;
}
if (ntfs_attr_pread(attr, (bmplcn>>3), SIZEOF_BUFFER, buffer) < 0)
{
log_error("Couldn't read $Bitmap\n");
ntfs_attr_close(attr);
free(buffer);
dir_data.close(&dir_data);
return 0;
}
ntfs_attr_close(attr);
}
bit = 1 << (lcn & 7);
byte = (lcn >> 3) & (SIZEOF_BUFFER - 1);
if((buffer[byte] & bit)!=0)
{
/* Not free */
if(end_free+1==partition->part_offset+(uint64_t)lcn*cluster_size)
end_free+=cluster_size;
else
{
if(start_free < end_free)
del_search_space(list_search_space, start_free, end_free);
start_free=partition->part_offset+(uint64_t)lcn*cluster_size;
end_free=start_free+(uint64_t)cluster_size-1;
}
}
}
free(buffer);
if(start_free < end_free)
del_search_space(list_search_space, start_free, end_free);
dir_data.close(&dir_data);
return cluster_size;
}
}
#endif
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