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/*
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);
@ terminates \true;
@ 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;
@ loop variant buffer_size - 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);
@ terminates \true;
@ 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
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