/*

    File: texFAT.c

    Copyright (C) 2011 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.

 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <ctype.h>
#include "types.h"
#include "common.h"
#include "lang.h"
#include "intrf.h"
#include "intrfn.h"
#include "exfat.h"
#include "log.h"
#include "log_part.h"
#include "texfat.h"

#ifdef HAVE_NCURSES
static void exFAT_dump_ncurses(disk_t *disk, const partition_t *partition, const unsigned char *buffer_bs, const unsigned char *buffer_backup_bs)
{
  WINDOW *window=newwin(LINES, COLS, 0, 0);	/* full screen */
  keypad(window, TRUE); /* Need it to get arrow key */
  aff_copy(window);
  wmove(window,4,0);
  wprintw(window,"%s",disk->description(disk));
  wmove(window,5,0);
  aff_part(window,AFF_PART_ORDER|AFF_PART_STATUS,disk,partition);
  mvwaddstr(window,6,0, "Boot sector                       Backup boot record");
  dump2(window, buffer_bs, buffer_backup_bs, 12 * disk->sector_size);
  delwin(window);
  (void) clearok(stdscr, TRUE);
#ifdef HAVE_TOUCHWIN
  touchwin(stdscr);
#endif
}
#endif

static void exFAT_dump(disk_t *disk, const partition_t *partition, const unsigned char *buffer_bs, const unsigned char *buffer_backup_bs, char **current_cmd)
{
  log_info("Superblock                        Backup superblock\n");
  dump2_log(buffer_bs, buffer_backup_bs, 12 * disk->sector_size);
  if(*current_cmd==NULL)
  {
#ifdef HAVE_NCURSES
    exFAT_dump_ncurses(disk, partition, buffer_bs, buffer_backup_bs);
#endif
  }
}

static int exFAT_boot_sector_command(char **current_cmd, const char *options)
{
  skip_comma_in_command(current_cmd);
  if(check_command(current_cmd,"dump",4)==0)
  {
    return 'D';
  }
  else if(check_command(current_cmd,"originalexFAT",13)==0)
  {
    if(strchr(options,'O')!=NULL)
      return 'O';
  }
  else if(check_command(current_cmd,"backupexFAT",11)==0)
  {
    if(strchr(options,'B')!=NULL)
      return 'B';
  }
  return 0;
}

static const char *exFAT_boot_sector_rescan(disk_t *disk, const partition_t *partition, unsigned char *buffer_bs, unsigned char *buffer_backup_bs)
{
  const int size_bs=12 * disk->sector_size;
  int opt_B=0;
  int opt_O=0;
#ifdef HAVE_NCURSES
  aff_copy(stdscr);
  wmove(stdscr,4,0);
  wprintw(stdscr,"%s",disk->description(disk));
  mvwaddstr(stdscr,5,0,msg_PART_HEADER_LONG);
  wmove(stdscr,6,0);
  aff_part(stdscr,AFF_PART_ORDER|AFF_PART_STATUS,disk,partition);
#endif
  log_info("\nexFAT_boot_sector\n");
  log_partition(disk,partition);
  screen_buffer_add("Boot sector\n");
  if(disk->pread(disk, buffer_bs, size_bs, partition->part_offset) != size_bs)
  {
    screen_buffer_add("Bad: can't read exFAT boot record.\n");
    memset(buffer_bs,0,size_bs);
  }
  else if(test_exFAT((const struct exfat_super_block*)buffer_bs)==0)
  {
    screen_buffer_add("exFAT OK\n");
    opt_O=1;
  }
  else
    screen_buffer_add("Bad\n");
  screen_buffer_add("\nBackup boot record\n");
  if(disk->pread(disk, buffer_backup_bs, size_bs, partition->part_offset + size_bs) != size_bs)
  {
    screen_buffer_add("Bad: can't read exFAT backup boot record.\n");
    memset(buffer_backup_bs,0,size_bs);
  }
  else if(test_exFAT((const struct exfat_super_block*)buffer_backup_bs)==0)
  {
    screen_buffer_add("exFAT OK\n");
    opt_B=1;
  }
  else
    screen_buffer_add("Bad\n");
  screen_buffer_add("\n");
  if(memcmp(buffer_bs, buffer_backup_bs, size_bs)==0)
  {
    screen_buffer_add("Sectors are identical.\n");
    return "D";
  }
  else
  {
    screen_buffer_add("Sectors are not identical.\n");
  }
  if(opt_B!=0 && opt_O!=0)
    return "DOB";
  else if(opt_B!=0)
    return "DB";
  else if(opt_O!=0)
    return "DO";
  return "D";
}

int exFAT_boot_sector(disk_t *disk, partition_t *partition, char **current_cmd)
{
  unsigned char *buffer_bs;
  unsigned char *buffer_backup_bs;
  int rescan=1;
  const int size_bs=12 * disk->sector_size;
  const char *options;
#ifdef HAVE_NCURSES
  const struct MenuItem menu_exFAT[]=
  {
    { 'P', "Previous",""},
    { 'N', "Next","" },
    { 'Q', "Quit","Return to Advanced menu"},
    { 'O', "Org. BS","Copy superblock over backup sector"},
    { 'B', "Backup BS","Copy backup superblock over superblock"},
    { 'D', "Dump","Dump superblock and backup superblock"},
    { 0, NULL, NULL }
  };
#endif
  buffer_bs=(unsigned char*)MALLOC(size_bs);
  buffer_backup_bs=(unsigned char*)MALLOC(size_bs);
  while(1)
  {
    int command;
    screen_buffer_reset();
    if(rescan==1)
    {
      options=exFAT_boot_sector_rescan(disk, partition, buffer_bs, buffer_backup_bs);
      rescan=0;
    }
    screen_buffer_to_log();
    if(*current_cmd!=NULL)
    {
      command=exFAT_boot_sector_command(current_cmd, options);
    }
    else
    {
#ifdef HAVE_NCURSES
      unsigned int menu=0;
#endif
      log_flush();
#ifdef HAVE_NCURSES
      command=screen_buffer_display_ext(stdscr, options, menu_exFAT, &menu);
#else
      command=0;
#endif
    }
    switch(command)
    {
      case 0:
        free(buffer_bs);
        free(buffer_backup_bs);
	return 0;
      case 'O': /* O : copy original superblock over backup boot */
#ifdef HAVE_NCURSES
	if(ask_confirmation("Copy original exFAT boot record over backup, confirm ? (Y/N)")!=0)
#endif
	{
	  log_info("copy original superblock over backup boot\n");
	  if(disk->pwrite(disk, buffer_bs, size_bs, partition->part_offset + size_bs) != size_bs)
	  {
	    display_message("Write error: Can't overwrite exFAT backup boot record\n");
	  }
          disk->sync(disk);
	  rescan=1;
	}
	break;
      case 'B': /* B : copy backup superblock over main superblock */
#ifdef HAVE_NCURSES
	if(ask_confirmation("Copy backup exFAT boot record over main boot record, confirm ? (Y/N)")!=0)
#endif
	{
	  log_info("copy backup superblock over main superblock\n");
	  /* Reset information about backup boot record */
	  partition->sb_offset=0;
	  if(disk->pwrite(disk, buffer_backup_bs, size_bs, partition->part_offset) != size_bs)
	  {
	    display_message("Write error: Can't overwrite exFAT main boot record\n");
	  }
          disk->sync(disk);
	  rescan=1;
	}
	break;
      case 'D':
	exFAT_dump(disk, partition, buffer_bs, buffer_backup_bs, current_cmd);
	break;
    }
  }
}