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/*
File: file_spf.c
Copyright (C) 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.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_spf)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include "types.h"
#include "filegen.h"
#include "common.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_spf(file_stat_t *file_stat);
const file_hint_t file_hint_spf= {
.extension="spf",
.description="ShadowProtect",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_spf
};
enum { READ_SIZE=32*512 };
/*@
@ requires file_recovery->file_check == &file_check_spf;
@ requires valid_file_check_param(file_recovery);
@ ensures valid_file_check_result(file_recovery);
@ assigns *file_recovery->handle, file_recovery->file_size, Frama_C_entropy_source, errno;
@*/
static void file_check_spf(file_recovery_t *file_recovery)
{
file_recovery->file_size=0;
if(my_fseek(file_recovery->handle, 0, SEEK_SET)<0)
{
return;
}
/*@ loop assigns *file_recovery->handle, file_recovery->file_size;
@ loop assigns Frama_C_entropy_source, errno; */
while(1)
{
int i;
char buffer[READ_SIZE];
const int taille=fread(buffer,1,READ_SIZE,file_recovery->handle);
if(taille<512 || taille%512!=0)
{
file_recovery->file_size=0;
return ;
}
#ifdef __FRAMAC__
Frama_C_make_unknown(buffer, READ_SIZE);
#endif
/*@ loop assigns i, file_recovery->file_size; */
for(i=0; i<taille; i+=512)
{
int j;
int is_valid=0;
file_recovery->file_size+=512;
if(file_recovery->file_size >= PHOTOREC_MAX_FILE_SIZE)
{
return;
}
/*@ loop assigns j, is_valid; */
for(j=0; j<8; j++)
if(buffer[i+j]!=0)
is_valid=1;
/*@ loop assigns j; */
for(j=8; j<512 && buffer[i+j]==0; j++);
if(is_valid > 0 && j==512)
{
return;
}
}
}
}
/*@
@ requires separation: \separated(&file_hint_spf, 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;
@*/
static int header_check_spf(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_spf.extension;
file_recovery_new->file_check=&file_check_spf;
return 1;
}
static void register_header_check_spf(file_stat_t *file_stat)
{
static const unsigned char spf_header[12]= {
'S', 'P', 'F', 'I', 0x00, 0x02, 0x00, 0x00, 0x41, 0x00, 0x00, 0x00
};
register_header_check(0, spf_header,sizeof(spf_header), &header_check_spf, file_stat);
}
#endif
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