#ifndef __MOBIUS_IMAGEFILE_EWF_SEGMENT_DECODER_H__
#define __MOBIUS_IMAGEFILE_EWF_SEGMENT_DECODER_H__

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Mobius Forensic Toolkit
// Copyright (C) 2008,2009,2010,2011,2012,2013,2014,2015,2016,2017,2018 Eduardo Aguiar
//
// This program 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, 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, see <http://www.gnu.org/licenses/>.
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
#include <mobius/imagefile/ewf/section.h>
#include <mobius/imagefile/ewf/header_section.h>
#include <mobius/imagefile/ewf/volume_section.h>
#include <mobius/imagefile/ewf/table_section.h>
#include <mobius/imagefile/ewf/hash_section.h>
#include <mobius/io/reader.h>

namespace mobius
{
namespace imagefile
{
namespace ewf
{
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief EWF segment file decoder
//! \author Eduardo Aguiar
//! \see https://github.com/libyal/libewf/blob/master/documentation/Expert%20
//       Witness%20Compression%20Format%20(EWF).asciidoc
//       (version 0.0.80, visited in 2016-08-25)
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
class segment_decoder
{
public:
  using offset_type = mobius::io::reader::offset_type;

    // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  //! \brief iterator for EWF sections
  // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  class const_iterator
  {
  public:
    using self_type = const_iterator;
    using value_type = section;
    using reference = section&;
    using pointer = section *;
    using difference_type = int;
    using iterator_category = std::forward_iterator_tag;

    // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
    // constructors
    // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
    const_iterator () = default;
    const_iterator (const_iterator&&) = default;
    const_iterator (const const_iterator&) = default;
    const_iterator (const segment_decoder *, offset_type);

    // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
    // operators' prototypes
    // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
    const_iterator& operator= (const const_iterator&) = default;
    const_iterator& operator= (const_iterator&&) = default;
    const_iterator& operator++ ();
    bool operator== (const const_iterator&);
    
    // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
    //! \brief check if two iterators are different
    //! \param i iterator
    //! \return true/false
    // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
    bool
    operator!= (const_iterator& i)
    {
      return !(*this == i);
    }

    // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
    //! \brief get current section
    //! \return section object
    // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
    const section&
    operator* ()
    {
      return section_;
    }

  private:
    const segment_decoder *decoder_ = nullptr;
    section section_;
  };

  // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  //! \brief check whether segment file is valid
  //! \return true/false
  // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  operator bool () const
  {
    return is_valid_;
  }

  // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  //! \brief get segment number
  //! \return segment number, starting from 1
  // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  std::uint32_t
  get_segment_number () const
  {
    return segment_number_;
  }

  // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  // prototypes
  // =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  explicit segment_decoder (mobius::io::reader reader);
  const_iterator begin () const;
  const_iterator end () const;

  const section decode_section (offset_type) const;
  const header_section decode_header_section (const section&) const;
  const volume_section decode_volume_section (const section&) const;
  const table_section decode_table_section (const section&) const;
  const hash_section decode_hash_section (const section&) const;

private:
  mobius::io::reader reader_;
  bool is_valid_ = false;
  std::uint32_t segment_number_ = 0;
};

} // namespace ewf
} // namespace imagefile
} // namespace mobius

#endif
