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/*
File: file_tib.c
Copyright (C) 2007-2010 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_tib)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.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_tib(file_stat_t *file_stat);
const file_hint_t file_hint_tib= {
.extension="tib",
.description="Acronis True Image",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_tib
};
static const unsigned char tib2_footer[7]= {0x00, 0x00, 0x20, 0xa2, 0xb9, 0x24, 0xce};
/*@
@ requires file_recovery->data_check==&data_check_tib2;
@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
@ ensures valid_data_check_result(\result, file_recovery);
@ assigns file_recovery->calculated_file_size;
@*/
static data_check_t data_check_tib2(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@
@ loop assigns file_recovery->calculated_file_size;
@ loop variant file_recovery->file_size + buffer_size/2 - (file_recovery->calculated_file_size + 512);
@*/
while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
file_recovery->calculated_file_size + 512 <= file_recovery->file_size + buffer_size/2)
{
const unsigned int i=file_recovery->calculated_file_size + buffer_size/2 - file_recovery->file_size;
/*@ assert 0 <= i <= buffer_size - 512; */
file_recovery->calculated_file_size+=512;
if(memcmp(&buffer[i + 512 - sizeof(tib2_footer)], tib2_footer, sizeof(tib2_footer))==0)
return DC_STOP;
}
return DC_CONTINUE;
}
/*@
@ requires file_recovery->file_check == &file_check_tib2;
@ 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_tib2(file_recovery_t *file_recovery)
{
int64_t file_size;
if(file_recovery->calculated_file_size < 512)
{
file_recovery->file_size=0;
return ;
}
file_size=file_recovery->calculated_file_size-512;
file_recovery->file_size = file_recovery->calculated_file_size;
{
char buffer[512];
if(my_fseek(file_recovery->handle, file_size, SEEK_SET) < 0 ||
fread(buffer, 1, 512, file_recovery->handle) != 512)
{
file_recovery->file_size=0;
return;
}
#ifdef __FRAMAC__
Frama_C_make_unknown(buffer, 512);
#endif
if(memcmp(&buffer[512 - sizeof(tib2_footer)], tib2_footer, sizeof(tib2_footer))==0)
{
return;
}
}
/*@
@ loop assigns *file_recovery->handle, errno, file_size;
@ loop assigns Frama_C_entropy_source;
@ loop variant file_size;
@*/
for(; file_size>0; file_size-=512)
{
unsigned int i;
char buffer[512];
if(my_fseek(file_recovery->handle, file_size, SEEK_SET) < 0 ||
fread(buffer, 1, 512, file_recovery->handle) != 512)
{
file_recovery->file_size=0;
return;
}
/*@
@ loop assigns i;
@ loop variant 512 - i;
@*/
for(i=0; i<512 && buffer[i]==0; i++);
if(i!=512)
{
file_recovery->file_size=file_size + 512;
return ;
}
}
}
/*@
@ requires separation: \separated(&file_hint_tib, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ terminates \true;
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_tib(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)
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_tib.extension;
return 1;
}
/*@
@ requires separation: \separated(&file_hint_tib, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ terminates \true;
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_tib2(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)
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_tib.extension;
if(file_recovery_new->blocksize < 512)
return 1;
file_recovery_new->file_check=&file_check_tib2;
file_recovery_new->data_check=&data_check_tib2;
return 1;
}
static void register_header_check_tib(file_stat_t *file_stat)
{
static const unsigned char tib_header[4]= { 0xb4, 0x6e, 0x68, 0x44};
static const unsigned char tib2_header[7]= { 0xce, 0x24, 0xb9, 0xa2, 0x20, 0x00, 0x00};
register_header_check(0, tib_header,sizeof(tib_header), &header_check_tib, file_stat);
register_header_check(0, tib2_header,sizeof(tib2_header), &header_check_tib2, file_stat);
}
#endif
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