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/*
File: file_dss.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_dss)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#include <stdio.h>
#include <ctype.h>
#include "types.h"
#include "filegen.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_dss(file_stat_t *file_stat);
const file_hint_t file_hint_dss = {
.extension = "dss",
.description = "Digital Speech Standard",
.max_filesize = PHOTOREC_MAX_FILE_SIZE,
.recover = 1,
.enable_by_default = 1,
.register_header_check = ®ister_header_check_dss
};
/*
Digital Speech Standard (.dss) is a digital speech recording standard
which was jointly developed and introduced by Olympus, Grundig and
Phillips in 1994.
0x00 char magic[4];
0x26 char create_date[12];
0x32 char complete_date[12];
0x3e char length[6];
0x31e char comments[100];
Filesize is always a multiple of 512
*/
/*@
@ requires buffer_size >= 0x26+24;
@ requires separation: \separated(&file_hint_dss, 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_dss(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 unsigned char *udate_asc = (const unsigned char *)&buffer[0x26];
const char *date_asc = (const char *)&buffer[0x26];
unsigned int i;
/*@
@ loop assigns i;
@ loop variant 24 - i;
@*/
for(i = 0; i < 24; i++)
if(!isdigit(udate_asc[i]))
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension = file_hint_dss.extension;
/* File should be big enough to hold the comments */
file_recovery_new->min_filesize = 1024;
file_recovery_new->time = get_time_from_YYMMDDHHMMSS(date_asc);
return 1;
}
static void register_header_check_dss(file_stat_t *file_stat)
{
static const unsigned char dss_header[4] = { 0x02, 'd', 's', 's' };
register_header_check(0, dss_header, sizeof(dss_header), &header_check_dss, file_stat);
}
#endif
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