module RLP::Utils

def big_endian_to_int(v)
  v.unpack('H*').first.to_i(16)
end

def bytes?(s)
  s && s.instance_of?(String) && s.encoding.name == BINARY_ENCODING
end

def bytes_to_str(v)
  v.unpack('U*').pack('U*')
end

def decode_hex(s)
  raise TypeError, "Value must be an instance of string" unless s.instance_of?(String)
  raise TypeError, 'Non-hexadecimal digit found' unless s =~ /\A[0-9a-fA-F]*\z/
  [s].pack("H*")
end

def encode_hex(b)
  raise TypeError, "Value must be an instance of String" unless b.instance_of?(String)
  b.unpack("H*").first
end

def int_to_big_endian(v)
  hex = v.to_s(16)
  hex = "0#{hex}" if hex.size.odd?
  [hex].pack('H*')
end

def list?(item)
  !primitive?(item) && item.respond_to?(:each)
end

def make_immutable!(obj)
  if obj.is_a?(Sedes::Serializable)
    obj.make_immutable!
  elsif list?(obj)
    obj.map {|e| make_immutable!(e) }
  else
    obj
  end
end

def primitive?(item)
  item.instance_of?(String)
end

def str_to_bytes(v)
  bytes?(v) ? v : v.b
end