Module: Ber

Defined in:
lib/ber.rb,
lib/ber/array.rb,
lib/ber/bignum.rb,
lib/ber/fixnum.rb,
lib/ber/string.rb,
lib/ber/boolean.rb,
lib/ber/version.rb

Defined Under Namespace

Modules: Array, Bignum, Boolean, Fixnum, String

Constant Summary collapse

Zero = 
[0].pack('C')
Identifiers = 
{
  end_of_content: 0x0,
  boolean: 0x1,
  fixnum: 0x2,
  bit_string: 0x3,
  ocet_string: 0x4,
  null: 0x5,
  array: 0x30,
  
  # Quick shorthands
  string: 4
}
VERSION = 
"0.0.1"

Class Method Summary collapse

Class Method Details

.decode(input) ⇒ Object 



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# File 'lib/ber.rb', line 24

def self.decode(input)
  idents = Identifiers.select { |key, value| value == input.getbyte(0) }
  identifier = idents.first.first
  length = input.getbyte(1)
  if length >= 127
    length = input.length - (length - 126)
  end
  value = input[(input.length - length)..input.length]
  if identifier == :fixnum
    if length == 1
      value = value.unpack('C').first
    else
      if value.length < 4
        padded_value = "#{Zero * (4 - value.length)}#{value}"
        value = padded_value.unpack('N').first
      else
        hex_total = ""
        value.split("").each do |char|
          hex = char.ord.to_s(16)
          hex_total << "0" if hex.length == 1
          hex_total << hex
        end
        value = hex_total.to_i(16)
      end
    end
  elsif identifier == :boolean
    value = (value == Zero ? false : true)
  elsif identifier == :array 
    values = []
    found = value.scan(/(..[A-z]*)/) # This WILL NOT work for Bignums or strings of over 127 in length TODO: Fix this
    found.each do |v|
      values << Ber.decode(v.first)[:value]
    end
    value = values
  end
  {identifier: identifier, length: length, value: value}
end