/*

    File: file_wpd.c

    Copyright (C) 1998-2007 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
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "common.h"

static void register_header_check_wpd(file_stat_t *file_stat);
static int header_check_wpd(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 file_hint_t file_hint_wpd= {
  .extension="wpd",
  .description="Corel Documents",
  .min_header_distance=0,
  .max_filesize=PHOTOREC_MAX_FILE_SIZE,
  .recover=1,
  .enable_by_default=1,
  .register_header_check=&register_header_check_wpd
};

struct wpd_hdr
{
  unsigned char magic[4];
  uint32_t	documentOffset;
  uint8_t	productType;
  uint8_t	fileType;
  uint8_t	majorVersion;
  uint8_t	minorVersion;
  uint16_t	documentEncryption;
  uint16_t	indexHeaderOffset;	/* 14 */
  uint32_t	unk;
  uint32_t	documentSize;		/* 20: WP 6.1 or later ? */
} __attribute__ ((gcc_struct, __packed__));

static int header_check_wpd(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 struct wpd_hdr *hdr=(const struct wpd_hdr *)buffer;
  if(hdr->fileType==0x0a && hdr->majorVersion==0x02)
  {
    /* WP 6 */
    if(hdr->minorVersion == 0)
    {
      if(le32(hdr->documentOffset) < 20)
	return 0;
      reset_file_recovery(file_recovery_new);
      file_recovery_new->extension=file_hint_wpd.extension;
      file_recovery_new->min_filesize=le32(hdr->documentOffset);
      return 1;
    }
    if( le32(hdr->documentOffset) < sizeof(struct wpd_hdr) ||
	le32(hdr->documentSize) < le32(hdr->documentOffset))
      return 0;
    reset_file_recovery(file_recovery_new);
    file_recovery_new->extension=file_hint_wpd.extension;
    file_recovery_new->calculated_file_size=le32(hdr->documentSize);
    file_recovery_new->data_check=&data_check_size;
    file_recovery_new->file_check=&file_check_size;
    return 1;
  }
  if( /* WP5 */
      (hdr->fileType==0x0a && hdr->majorVersion==0x00) ||
      /* WP MAC 2.x, 3.0-3.5, 3.5e */
      (hdr->fileType==0x2c && (hdr->majorVersion>=0x02 && hdr->majorVersion<=0x04))
    )
  {
    if(le32(hdr->documentOffset) < 20)
      return 0;
    reset_file_recovery(file_recovery_new);
    file_recovery_new->extension=file_hint_wpd.extension;
    file_recovery_new->min_filesize=le32(hdr->documentOffset);
    return 1;
  }
  return 0;
}

static void register_header_check_wpd(file_stat_t *file_stat)
{
  static const unsigned char wpd_header[4]= {0xff, 'W','P','C'};
  register_header_check(0, wpd_header,sizeof(wpd_header), &header_check_wpd, file_stat);
}
