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/*
File: file_e01.c
Copyright (C) 2009 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.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_e01)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "common.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_e01(file_stat_t *file_stat);
static char ext[10];
const file_hint_t file_hint_e01= {
.extension="e01",
.description="Encase",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_e01
};
struct ewf_file_header
{
/* The EWF file signature (magic header)
* consists of 8 bytes containing
* EVF 0x09 0x0d 0x0a 0xff 0x00
*/
uint8_t signature[ 8 ];
/* The fields start
* consists of 1 byte (8 bit) containing
* 0x01
*/
uint8_t fields_start;
/* The fields segment number
* consists of 2 bytes (16 bits) containing
*/
uint16_t fields_segment;
/* The fields end
* consists of 2 bytes (16 bits) containing
* 0x00 0x00
*/
uint16_t fields_end;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires file_recovery->file_check == &file_check_e01;
@ requires valid_file_check_param(file_recovery);
@ ensures valid_file_check_result(file_recovery);
@ assigns *file_recovery->handle, errno, file_recovery->file_size;
@ assigns Frama_C_entropy_source;
@*/
static void file_check_e01(file_recovery_t *file_recovery)
{
const uint64_t tmp=file_recovery->file_size;
const unsigned char sig_done[16]={
'd', 'o', 'n', 'e', 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
const unsigned char sig_next[16]={
'n', 'e', 'x', 't', 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
file_search_footer(file_recovery, sig_next, sizeof(sig_next), 60);
if(file_recovery->file_size!=0)
return ;
file_recovery->file_size=tmp;
file_search_footer(file_recovery, sig_done, sizeof(sig_done), 60);
}
/*@
@ requires buffer_size >= sizeof(struct ewf_file_header);
@ requires separation: \separated(&file_hint_e01, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new, *(ext + (0 .. sizeof(ext)-1));
@*/
static int header_check_e01(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)
{
const struct ewf_file_header *ewf=(const struct ewf_file_header *)buffer;
uint16_t fields_segment=le16(ewf->fields_segment);
reset_file_recovery(file_recovery_new);
if(fields_segment > ('Z'-'E') * 100 + 99)
{
ext[0]='E';
ext[1]='0';
ext[2]='1';
ext[3]='_';
ext[4]='0'+(fields_segment/10000)%10;
ext[5]='0'+(fields_segment/1000)%10;
ext[6]='0'+(fields_segment/100)%10;
ext[7]='0'+(fields_segment/10)%10;
ext[8]='0'+fields_segment%10;
ext[9]='\0';
}
else
{
ext[0]='E'+fields_segment/100;
ext[1]='0'+(fields_segment/10)%10;
ext[2]='0'+(fields_segment%10);
ext[3]='\0';
}
file_recovery_new->extension=(const char*)&ext;
file_recovery_new->file_check=&file_check_e01;
return 1;
}
static void register_header_check_e01(file_stat_t *file_stat)
{
static const unsigned char e01_header[9]= {
'E' , 'V' , 'F' , 0x09, 0x0d, 0x0a, 0xff, 0x00,
0x01
};
register_header_check(0, e01_header, sizeof(e01_header), &header_check_e01, file_stat);
}
#endif
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