/*

    File: file_vmdk.c

    Copyright (C) 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"

static void register_header_check_vmdk(file_stat_t *file_stat);
static int header_check_vmdk(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_vmdk= {
  .extension="vmdk",
  .description="VMWare",
  .min_header_distance=0,
  .max_filesize=(uint64_t)2048*1024*1024*1024,
  .recover=1,
  .enable_by_default=1,
  .register_header_check=&register_header_check_vmdk
};

static const unsigned char vmdk_header4[4]= { 'K','D','M','V'};
static const unsigned char vmdk_header3[4]= { 'C','O','W','D'};

typedef struct {
    uint32_t version;
    uint32_t flags;
    uint32_t disk_sectors;
    uint32_t granularity;
    uint32_t l1dir_offset;
    uint32_t l1dir_size;
    uint32_t file_sectors;
    uint32_t cylinders;
    uint32_t heads;
    uint32_t sectors_per_track;
} VMDK3Header;

typedef struct {
    uint32_t version;
    uint32_t flags;
    int64_t capacity;
    int64_t granularity;
    int64_t desc_offset;
    int64_t desc_size;
    int32_t num_gtes_per_gte;
    int64_t rgd_offset;
    int64_t gd_offset;
    int64_t grain_offset;
    char filler[1];
    char check_bytes[4];
} __attribute__((packed)) VMDK4Header;

static void register_header_check_vmdk(file_stat_t *file_stat)
{
  register_header_check(0, vmdk_header3,sizeof(vmdk_header3), &header_check_vmdk, file_stat);
  register_header_check(0, vmdk_header4,sizeof(vmdk_header4), &header_check_vmdk, file_stat);
}

static int header_check_vmdk(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,vmdk_header3, sizeof(vmdk_header3))==0 ||
      memcmp(buffer,vmdk_header4, sizeof(vmdk_header4))==0)
  {
    reset_file_recovery(file_recovery_new);
#ifdef DJGPP
    file_recovery_new->extension="vmd";
#else
    file_recovery_new->extension=file_hint_vmdk.extension;
#endif
    return 1;
  }
  return 0;
}