NET_INT_OFFSET = 33
NET_INT_BASE = 93
NET_MAX_INT = NET_INT_BASE
NET_MIN_INT = 0

##
# Converts a integer to single character network string
#
# the base of the network is NET_INT_BASE
# so the number 93 is the last single character number represented as '~'
#
# @param [Integer, #chr] int decimal based number 
# @return [String] the int converted to base NET_INT_BASE

def net_pack_int(int)
  net_error "#{__method__}: '#{int}' is too low allowed range #{NET_MIN_INT}-#{NET_MAX_INT}" if int < NET_MIN_INT
  net_error "#{__method__}: '#{int}' is too high allowed range #{NET_MIN_INT}-#{NET_MAX_INT}" if int > NET_MAX_INT
  int = int + NET_INT_OFFSET
  int.chr
end

##
# Converts a single character network string to integer
#
# the base of the network is NET_INT_BASE
# so the number 93 is the last single character number represented as '~'
#
# @param [String, #ord] net_int network packed string
# @return [Integer] the net_int converted to decimal based number

def net_unpack_int(net_int)
  net_int.ord - NET_INT_OFFSET
end

##
# Converts a integer to multi character network string
#
# @param [Integer, #net_pack_int] int decimal based number
# @param [Integer] size max length of the network string
# @return [String] the int converted to base NET_INT_BASE

def net_pack_bigint(int, size)
  sum = ""
  div = size - 1
  (size - 1).times do
    buf = int / (NET_MAX_INT ** div)
    sum += net_pack_int(buf)
    int = int % (NET_MAX_INT ** div)
  end
  sum += net_pack_int(int)
  # TODO: check reminder and so on
  # throw and error when int is too big for size
  int = int / NET_MAX_INT
  sum
end

##
# Converts a multi character network string to integer
#
# @param [String, #net_unpack_int] net_int network packed int
# @return [Integer] the net_int converted to decimal based number

def net_unpack_bigint(net_int)
  sum = 0
  net_int.chars.reverse.each_with_index do |c, i|
    if sum.zero?
      sum = net_unpack_int(c)
    else
      sum += net_unpack_int(c) * i * NET_MAX_INT
    end
  end
  sum
end