77 lines
2.8 KiB
C
77 lines
2.8 KiB
C
/*
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File: file_ext2_fs.c
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Copyright (C) 1998-2005,2007 Christophe GRENIER <grenier@cgsecurity.org>
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This software is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write the Free Software Foundation, Inc., 51
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Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_ext2_fs)
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include <stdio.h>
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#include "types.h"
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#include "common.h"
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#include "ext2.h"
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#include "ext2_common.h"
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#include "filegen.h"
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static void register_header_check_ext2_fs(file_stat_t *file_stat);
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static int header_check_ext2_fs(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new);
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const file_hint_t file_hint_ext2_fs= {
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.extension="ext2",
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.description="ext2/ext3/ext4 Filesystem",
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.max_filesize=0,
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.recover=1,
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.enable_by_default=0,
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.register_header_check=®ister_header_check_ext2_fs
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};
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static const unsigned char ext2_fs_header[2]= {0x53, 0xEF};
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static void register_header_check_ext2_fs(file_stat_t *file_stat)
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{
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register_header_check(0x438, ext2_fs_header,sizeof(ext2_fs_header), &header_check_ext2_fs, file_stat);
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}
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static int header_check_ext2_fs(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
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{
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const struct ext2_super_block *sb=(const struct ext2_super_block *)&buffer[0x400];
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if(test_EXT2(sb, NULL)!=0)
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return 0;
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if(le16(sb->s_block_group_nr)!=0)
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return 0;
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if(file_recovery->file_stat!=NULL &&
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file_recovery->file_stat->file_hint==&file_hint_ext2_fs &&
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file_recovery->calculated_file_size==(uint64_t)le32(sb->s_blocks_count)*(EXT2_MIN_BLOCK_SIZE<<le32(sb->s_log_block_size)))
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{
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if(header_ignored_adv(file_recovery, file_recovery_new)==0)
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return 0;
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}
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension=file_hint_ext2_fs.extension;
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file_recovery_new->calculated_file_size=(uint64_t)le32(sb->s_blocks_count)*(EXT2_MIN_BLOCK_SIZE<<le32(sb->s_log_block_size));
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file_recovery_new->data_check=&data_check_size;
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file_recovery_new->file_check=&file_check_size;
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return 1;
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}
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#endif
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