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/*
File: ext2p.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_LIBEXT2FS
#endif
#if defined(HAVE_LIBEXT2FS)
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "types.h"
#include "common.h"
#include "list.h"
#include "filegen.h"
#include "photorec.h"
#include "intrf.h"
#include "dir.h"
#ifdef HAVE_EXT2FS_EXT2_FS_H
#include "ext2fs/ext2_fs.h"
#endif
#ifdef HAVE_EXT2FS_EXT2FS_H
#include "ext2fs/ext2fs.h"
#endif
#include "ext2p.h"
#include "ext2_inc.h"
#include "ext2_dir.h"
#include "log.h"
#include "log_part.h"
unsigned int ext2_remove_used_space(disk_t *disk, const partition_t *partition, alloc_data_t *list_search_space)
{
dir_data_t dir_data;
switch(dir_partition_ext2_init(disk, partition, &dir_data, 0))
{
case DIR_PART_ENOIMP:
case DIR_PART_ENOSYS:
return 0;
case DIR_PART_EIO:
log_partition(disk, partition);
log_error("Can't open filesystem. Filesystem seems damaged.\n");
return 0;
case DIR_PART_OK:
break;
}
{
struct ext2_dir_struct *ls=(struct ext2_dir_struct *)dir_data.private_dir_data;
uint64_t start_free=0;
uint64_t end_free=0;
unsigned long int block;
unsigned long int start,end;
const unsigned int blocksize=ls->current_fs->blocksize;
ext2fs_block_bitmap bitmap;
if(ext2fs_read_block_bitmap(ls->current_fs))
{
log_error("ext2fs_read_block_bitmap failed\n");
return 0;
}
bitmap=ls->current_fs->block_map;
if(bitmap==NULL)
return 0;
#ifdef HAVE_EXT2FS_GET_GENERIC_BITMAP_START
start=ext2fs_get_generic_bitmap_start(bitmap);
end=ext2fs_get_generic_bitmap_end(bitmap);
#else
start=bitmap->start;
end=bitmap->end;
#endif
log_trace("ext2_remove_used_space %lu-%lu\n", start, end);
for(block=start;block<=end;block++)
{
#ifdef HAVE_EXT2FS_GET_GENERIC_BITMAP_START
if(ext2fs_test_generic_bitmap(bitmap,block)!=0)
#else
if(ext2fs_test_bit(block - bitmap->start, bitmap->bitmap)!=0)
#endif
{
/* Not free */
if(end_free+1==partition->part_offset+(uint64_t)block*blocksize)
end_free+=blocksize;
else
{
if(start_free != end_free)
del_search_space(list_search_space, start_free, end_free);
start_free=partition->part_offset+(uint64_t)block*blocksize;
end_free=start_free+(uint64_t)blocksize-1;
}
}
}
if(start_free != end_free)
del_search_space(list_search_space, start_free, end_free);
dir_data.close(&dir_data);
return blocksize;
}
}
#endif
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