// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// 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 "imagefile_impl_talon.h"
#include <mobius/io/file.h>
#include <mobius/regex_impl.h>
#include <mobius/string_functions.h>
#include <mobius/exception.inc>
#include <mobius/charset.h>
#include <stdexcept>

namespace mobius
{
namespace imagefile
{
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief get URL for first segment file
//! \param url imagefile URL
//! \return first segment file URL
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static const std::string
get_first_segment_url (const std::string& url)
{
  return url.substr (0, url.length () - 4) + ".001";
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief check if URL is an instance of imagefile talon
//! \return true/false
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
bool
imagefile_impl_talon::is_instance (const std::string& url)
{
  bool instance = false;

  mobius::io::file f (url);

  if (f && f.exists ())
    {
      auto reader = f.new_reader ();
      mobius::bytearray data = reader.read (128);
      const std::string text = conv_charset_to_utf8 (data, "ASCII");

      instance = text.find ("FORENSIC TALON") != std::string::npos ||
                 text.find ("LOGICUBE TALON") != std::string::npos;
    }

  return instance;
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief construct object
//! \param url imagefile URL
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
imagefile_impl_talon::imagefile_impl_talon (const std::string& url)
  : url_ (url),
    split_imagefile_ (get_first_segment_url (url))
{
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief create new reader for imagefile
//! \return reader
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
mobius::io::reader
imagefile_impl_talon::new_reader () const
{
  return split_imagefile_.new_reader ();
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief create new writer for imagefile
//! \return writer
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
mobius::io::writer
imagefile_impl_talon::new_writer () const
{
  throw std::runtime_error (MOBIUS_EXCEPTION_MSG ("writer not implemented"));
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief get metadata
//! \return imagefile metadata
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
mobius::metadata
imagefile_impl_talon::get_metadata () const
{
  return mobius::metadata
  {
    {
      "url",
      "URL",
      "std::string",
      get_url ()
    },
    {
      "type",
      "type",
      "std::string",
      get_type ()
    },
    {
      "size",
      "size",
      "size_type",
      std::to_string (get_size ()) + " bytes"
    },
    {
      "sectors",
      "number of sectors",
      "size_type",
      std::to_string (get_sectors ())
    },
    {
      "sector_size",
      "sector size",
      "size_type",
      std::to_string (get_sector_size ()) + " bytes"
    },
    {
      "segments",
      "segments",
      "size_type",
      std::to_string (get_segments ())
    },
    {
      "segment_size",
      "segment_size",
      "size_type",
      std::to_string (get_segment_size ()) + " bytes"
    },
    {
      "drive_vendor",
      "drive vendor",
      "std::string",
      get_drive_vendor ()
    },
    {
      "drive_model",
      "drive model",
      "std::string",
      get_drive_model ()
    },
    {
      "drive_serial_number",
      "drive serial number",
      "std::string",
      get_drive_serial_number ()
    },
    {
      "acquisition_user",
      "acquisition user name",
      "std::string",
      get_acquisition_user ()
    },
    {
      "acquisition_time",
      "acquisition date/time",
      "mobius::datetime::datetime",
      to_string (get_acquisition_time ())
    },
    {
      "acquisition_tool",
      "acquisition tool",
      "std::string",
      get_acquisition_tool ()
    },
    {
      "acquisition_platform",
      "acquisition platform",
      "std::string",
      get_acquisition_platform ()
    },
  };
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief load metadata on demand
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
void
imagefile_impl_talon::_load_metadata () const
{
  if (metadata_loaded_)
    return;

  // load metadata
  mobius::io::file f (url_);
  constexpr mobius::io::file::size_type LOG_MAX_SIZE = 65536;

  if (f.exists () && f.get_size () < LOG_MAX_SIZE)
    {
      mobius::regex REGEX_TALON_SERIAL ("Serial No.: ?([0-9]+)");
      mobius::regex REGEX_TALON_SOFTWARE ("Software: ([A-Z0-9.]+)");
      mobius::regex REGEX_DRIVE_MODEL ("Drive Model: ([^*]+?) *\\*");
      mobius::regex REGEX_DRIVE_SERIAL ("Serial: ([0-9A-Z-]+) *\\*");
      mobius::regex REGEX_TOTAL_SECTORS ("Drive Size *\\*\r\n\\* *[0-9]+ *[0-9]+ *[0-9]+ *([0-9]+)");

      // parse .log file
      auto reader = f.new_reader ();
      mobius::bytearray data = reader.read (f.get_size ());
      const std::string text = conv_charset_to_utf8 (data, "ASCII");

      if (REGEX_TALON_SERIAL.match (text))
        acquisition_platform_ = "Logicube Talon (s/n: " + REGEX_TALON_SERIAL[1] + ')';

      if (REGEX_TALON_SOFTWARE.match (text))
        acquisition_tool_ = "Talon software " + REGEX_TALON_SOFTWARE[1];

      if (REGEX_DRIVE_MODEL.match (text))
        drive_model_ = mobius::string::strip (REGEX_DRIVE_MODEL[1]);

      if (REGEX_DRIVE_SERIAL.match (text))
        drive_serial_number_ = REGEX_DRIVE_SERIAL[1];

      if (REGEX_TOTAL_SECTORS.match (text))
        {
          sectors_ = stoll (REGEX_TOTAL_SECTORS[1]);
          size_ = sectors_ * sector_size_;
        }

      segments_ = split_imagefile_.get_segments ();
      segment_size_ = split_imagefile_.get_segment_size ();
      acquisition_user_ = f.get_user_name ();
      acquisition_time_ = f.get_last_modification_time ();
      
      normalize_drive_info (drive_vendor_, drive_model_, drive_serial_number_);
    }

  // set metadata loaded
  metadata_loaded_ = true;
}

} // namespace imagefile
} // namespace mobius
