127 lines
4.5 KiB
C
127 lines
4.5 KiB
C
/*
|
|
|
|
File: file_pdb.c
|
|
|
|
Copyright (C) 2018 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_pdb)
|
|
#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"
|
|
|
|
/*@ requires valid_register_header_check(file_stat); */
|
|
static void register_header_check_pdb(file_stat_t *file_stat);
|
|
|
|
const file_hint_t file_hint_pdb= {
|
|
.extension="pdb",
|
|
.description="Protein Data Bank data",
|
|
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
|
|
.recover=1,
|
|
.enable_by_default=1,
|
|
.register_header_check=®ister_header_check_pdb
|
|
};
|
|
|
|
/*@
|
|
@ requires file_recovery->data_check==&data_check_pdb;
|
|
@ 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_pdb(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
|
|
{
|
|
unsigned int i;
|
|
/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
|
|
/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
|
|
/*@ loop assigns i; */
|
|
for(i=buffer_size/2; i<buffer_size; i++)
|
|
if(buffer[i]==0)
|
|
{
|
|
file_recovery->calculated_file_size+=i;
|
|
return DC_STOP;
|
|
}
|
|
file_recovery->calculated_file_size+=buffer_size/2;
|
|
return DC_CONTINUE;
|
|
}
|
|
|
|
/*@
|
|
@ requires file_recovery->file_check == &file_check_pdb;
|
|
@ 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_pdb(file_recovery_t *file_recovery)
|
|
{
|
|
char buffer[512];
|
|
if(my_fseek(file_recovery->handle, 0, SEEK_SET) < 0 ||
|
|
fread(&buffer, 1, sizeof(buffer), file_recovery->handle) < 82)
|
|
return ;
|
|
#if defined(__FRAMAC__)
|
|
Frama_C_make_unknown(buffer, sizeof(buffer));
|
|
#endif
|
|
if(buffer[80]=='\r' && buffer[81]=='\n')
|
|
file_recovery->file_size=file_recovery->calculated_file_size/82*82;
|
|
else if(buffer[80]=='\n')
|
|
file_recovery->file_size=file_recovery->calculated_file_size/81*81;
|
|
else
|
|
file_recovery->file_size=0;
|
|
}
|
|
|
|
/*@
|
|
@ requires buffer_size >= 70;
|
|
@ requires separation: \separated(&file_hint_pdb, 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_pdb(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)
|
|
{
|
|
/* Check date */
|
|
if(buffer[0x32] < '0' || buffer[0x32] > '9' || buffer[0x33] < '0' || buffer[0x33] > '9')
|
|
return 0;
|
|
if(buffer[0x34]!='-')
|
|
return 0;
|
|
if(buffer[0x35] < 'A' || buffer[0x35] > 'Z' || buffer[0x36] < 'A' || buffer[0x36] > 'Z' || buffer[0x37] < 'A' || buffer[0x37] > 'Z')
|
|
return 0;
|
|
if(buffer[0x38]!='-')
|
|
return 0;
|
|
if(buffer[0x39] < '0' || buffer[0x39] > '9' || buffer[0x3a] < '0' || buffer[0x3a] > '9')
|
|
return 0;
|
|
/* Check space */
|
|
if(buffer[59]!=' ' || buffer[60]!=' ' || buffer[61]!=' ' || buffer[66]!=' ' || buffer[67]!=' ' || buffer[68]!=' ' || buffer[69]!=' ')
|
|
return 0;
|
|
reset_file_recovery(file_recovery_new);
|
|
file_recovery_new->extension=file_hint_pdb.extension;
|
|
file_recovery_new->data_check=&data_check_pdb;
|
|
file_recovery_new->file_check=&file_check_pdb;
|
|
file_recovery_new->min_filesize=80;
|
|
return 1;
|
|
}
|
|
|
|
static void register_header_check_pdb(file_stat_t *file_stat)
|
|
{
|
|
register_header_check(0, "HEADER ", 10, &header_check_pdb, file_stat);
|
|
}
|
|
#endif
|