/*

    File: file_dat.c

    Copyright (C) 2007,2012 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_dat)
#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_dat(file_stat_t *file_stat);

const file_hint_t file_hint_dat= {
  .extension="dat",
  .description="IE History, Glavna Knjiga account data",
  .max_filesize=2*1024*1024,
  .recover=1,
  .enable_by_default=1,
  .register_header_check=&register_header_check_dat
};

/*@
  @ requires separation: \separated(&file_hint_dat, 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_dat(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_dat.extension;
  file_recovery_new->min_filesize=8;
  return 1;
}

/*@
  @ requires buffer_size >= 0x20;
  @ requires separation: \separated(&file_hint_dat, 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_datIE(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 uint64_t size=(uint64_t)buffer[0x1C]+(((uint64_t)buffer[0x1D])<<8)+(((uint64_t)buffer[0x1E])<<16)+(((uint64_t)buffer[0x1F])<<24);
  if(size < 0x20)
    return 0;
  reset_file_recovery(file_recovery_new);
  file_recovery_new->extension=file_hint_dat.extension;
  file_recovery_new->min_filesize=0x20;
  file_recovery_new->calculated_file_size=size;
  file_recovery_new->data_check=&data_check_size;
  file_recovery_new->file_check=&file_check_size;
  return 1;
}

/*@
  @ requires buffer_size >= 0x30+12;
  @ requires separation: \separated(&file_hint_dat, 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_dat_history4(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)
{
  if(memcmp(&buffer[0x30], "BrowserVisit", 12)!=0)
    return 0;
  reset_file_recovery(file_recovery_new);
  file_recovery_new->extension=file_hint_dat.extension;
  file_recovery_new->min_filesize=60;
  return 1;
}

/*@
  @ requires buffer_size >= 0x36+12;
  @ requires separation: \separated(&file_hint_dat, 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_dat_history10(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)
{
  if(memcmp(&buffer[0x36], "BrowserVisit", 12)!=0)
    return 0;
  reset_file_recovery(file_recovery_new);
  file_recovery_new->extension=file_hint_dat.extension;
  file_recovery_new->min_filesize=66;
  return 1;
}

static void register_header_check_dat(file_stat_t *file_stat)
{
  static const unsigned char dat_header[8]= {0x30, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
  /* Found on Sony Ericson phone */
  static const unsigned char dat_history[8]={ 'N', 'F', 'P', 'K', 'D', 'D', 'A', 'T'};
  register_header_check(0, dat_header,sizeof(dat_header), &header_check_dat, file_stat);
  register_header_check(0, "Client UrlCache MMF Ver 5.2", 0x1c, &header_check_datIE, file_stat);
  register_header_check(4, dat_history, sizeof(dat_history), &header_check_dat_history4, file_stat);
  register_header_check(10, dat_history, sizeof(dat_history), &header_check_dat_history10, file_stat);
}
#endif