# =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
# Mobius Forensic Toolkit
# Copyright (C) 2008,2009,2010,2011,2012,2013,2014,2015,2016,2017,2018,2019,2020,2021,2022,2023 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/>.
# =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
import traceback
import mobius
import pymobius

# =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
# @brief Decode file
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def decode (f):
  try:
    return decode_file (f)

  except Exception as e:
    mobius.core.logf ('WRN %s %s' % (str (e), traceback.format_exc ()))

# =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
# @brief Decode data from dht.dat file
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def decode_file (f):

  # check file
  if not f or f.is_reallocated ():
    return

  # try to open file
  reader = f.new_reader ()

  if not reader:
    return

  # decode BTEncode data
  metadata = mobius.decoder.btencode (reader)

  # create data object
  data = pymobius.Data ()
  data.metadata = metadata
  data.ip = None
  data.timestamp = None
  data.guid = None

  # IP address
  if 'ip' in metadata:
    decoder = mobius.decoder.data_decoder (metadata.get ('ip'))
    data.ip = decoder.get_ipv4_be ()

  # Age
  data.timestamp = mobius.datetime.new_datetime_from_unix_timestamp (metadata.get ('age'))

  # Client GUID
  if 'id' in metadata:
    data.guid = mobius.encoder.hexstring (metadata.get ('id')).upper ()

  return data

# =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
# @brief Decode version
# =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
def get_version (v):
  if v:
    build = v & 0xffff
    v = v >> 16
    return '%s.%s.%s build %d' % (v >> 9, (v >> 5) & 0xf, (v >> 1) & 0xf, build)

  return None
