Class: IsoDep::Tag

Inherits:
NFC::Tag show all
Defined in:
lib/ruby-nfc/tags/isodep.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from NFC::Tag

#initialize, #processed!, #processed?, #to_s, #uid, #uid_hex

Constructor Details

This class inherits a constructor from NFC::Tag

Class Method Details

.match?(target) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ruby-nfc/tags/isodep.rb', line 11

def self.match?(target)
  target[:nti][:nai][:btSak] & IsoDep::ISO_14443_4_COMPATIBLE > 0
end

Instance Method Details

#deselect ⇒ Object 



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# File 'lib/ruby-nfc/tags/isodep.rb', line 48

def deselect
      0 == LibNFC.nfc_initiator_deselect_target(@reader.ptr)
end

#select(aid = nil, &block) ⇒ Object 



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# File 'lib/ruby-nfc/tags/isodep.rb', line 15

def select(aid = nil, &block)
  @reader.set_flag(:NP_AUTO_ISO14443_4, true)

      modulation = LibNFC::Modulation.new
      modulation[:nmt] = :NMT_ISO14443A
      modulation[:nbr] = :NBR_106

      nai_ptr = @target[:nti][:nai].pointer

      # abt + sak + szUidLen offset
      uid_ptr = nai_ptr + FFI.type_size(:uint8) * 3 + FFI.type_size(:size_t)

      res = LibNFC.nfc_initiator_select_passive_target(
@reader.ptr,
modulation,
uid_ptr,
uid.length,
@target.pointer
      )

      if res > 0
# trying to select applet if applet identifier was given
if aid
  sw = send_apdu("\x00\xA4\x04\x00#{aid.size.chr}#{aid}")
  raise IsoDep::Error, "Application not found: #{aid.unpack('H*').pop}" unless "\x90\x00" == sw
end

super(&block)
      else
raise IsoDep::Error, "Can't select tag: #{res}"
      end
end

#send_apdu(apdu) ⇒ Object Also known as: <<

Raises:



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# File 'lib/ruby-nfc/tags/isodep.rb', line 52

def send_apdu(apdu)
  cmd = apdu
  cmd.force_encoding('ASCII-8BIT')
      command_buffer = FFI::MemoryPointer.new(:uint8, cmd.length)
      command_buffer.write_string_length(cmd, cmd.length)

      response_buffer = FFI::MemoryPointer.new(:uint8, 254)

      res_len = LibNFC.nfc_initiator_transceive_bytes(@reader.ptr,
command_buffer, cmd.length, response_buffer, 254, 0)

      raise IsoDep::Error, "APDU sending failed: #{res_len}" if res_len < 0

      response_buffer.get_bytes(0, res_len).to_s
end