present method added to tag

lib/ruby-nfc/tags/tag.rb

@@ -24,6 +24,21 @@ def processed?
  @target.processed?
  end
 
+ def present?
+ modulation = LibNFC::Modulation.new
+ modulation[:nmt] = :NMT_ISO14443A 
+ modulation[:nbr] = :NBR_106
+
+ ptr = FFI::MemoryPointer.new(:char, @target[:nti][:nai][:szUidLen])
+ ptr.put_bytes(0, uid)
+
+ res = LibNFC.nfc_initiator_select_passive_target(@reader.ptr, modulation, ptr,
+ @target[:nti][:nai][:szUidLen],
+ FFI::Pointer::NULL)
+
+ return res >= 1
+ end
+
  def disconnect; end
 
  def uid

ruby-nfc.gemspec

@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
  s.name = 'ruby-nfc'
- s.version = '1.1.0'
- s.date = '2014-10-01'
+ s.version = '1.2'
+ s.date = '2015-11-23'
  s.summary = "Provides NFC functionality for Ruby"
  s.description = <<-EOF
  This gem is built on top of libnfc and libfreefare using ffi and supports:
@@ -11,7 +11,7 @@ Gem::Specification.new do |s|
  EOF
 
  s.authors = ["Maxim Chechel"]
- s.email = 'maximchick@gmail.com'
+ s.email = 'hexdigest@gmail.com'
  s.files = [
  "./lib/ruby-nfc.rb",
  "./lib/ruby-nfc/nfc.rb",
@@ -28,7 +28,7 @@ Gem::Specification.new do |s|
  "./LICENSE"
  ]
 
- s.homepage = 'https://github.com/maximchick/ruby-nfc'
+ s.homepage = 'https://github.com/hexdigest/ruby-nfc'
  s.license = 'MIT'
  s.requirements << 'libnfc, v1.7.x'
  s.requirements << 'libfreefare'
@@ -39,6 +39,6 @@ Gem::Specification.new do |s|
  s.post_install_message = <<-EOS
  Don't forget to install libnfc and libfreefare
  see installation instructions here: 
- https://github.com/maximchick/ruby-nfc
+ https://github.com/hexdigest/ruby-nfc
  EOS
 end