Class: CBOR::Loader

Inherits:
Object
  • Object
show all
Includes:
Consts
Defined in:
lib/cbor/loader.rb

Constant Summary collapse

@@registered_tags = 
{}

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(io, local_tags) ⇒ Loader

Returns a new instance of Loader.



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# File 'lib/cbor/loader.rb', line 10

def initialize(io, local_tags)
  @io = io
  @local_tags = local_tags
end

Class Method Details

.register_tag(tag, &block) ⇒ Object 



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# File 'lib/cbor/loader.rb', line 6

def self.register_tag(tag, &block)
  @@registered_tags[tag] = block
end

Instance Method Details

#load ⇒ Object 



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# File 'lib/cbor/loader.rb', line 15

def load
  typeInt = get_bytes(1, "C")
  major = (typeInt >> 5)

  case major
  when Major::UINT
    get_uint(typeInt)
  when Major::NEGINT
    -get_uint(typeInt)-1
  when Major::BYTESTRING
    count = get_uint(typeInt)
    get_bytes(count, "a*")
  when Major::TEXTSTRING
    count = get_uint(typeInt)
    s = get_bytes(count, "a*").force_encoding(Encoding::UTF_8)
    unless s.valid_encoding?
      raise CBOR::CborError.new("Received non-utf8 string when expecting utf8")
    end
    s
  when Major::ARRAY
    count = get_uint(typeInt)
    count.times.map { load }
  when Major::MAP
    count = get_uint(typeInt)
    Hash[count.times.map { [load, load] }]
  when Major::TAG
    tag = get_uint(typeInt)
    if block = @@registered_tags[tag]
      block.call(load)
    elsif block = @local_tags[tag]
      block.call(load)
    else
      raise CBOR::CborError.new("Unknown tag #{tag}")
    end
  when Major::SIMPLE
    case typeInt & 0x1F
    when Simple::FALSE
      false
    when Simple::TRUE
      true
    when Simple::NULL
      nil
    when Simple::FLOAT32
      get_bytes(4, "g")
    when Simple::FLOAT64
      get_bytes(8, "G")
    else
      raise CBOR::CborError.new("Unknown simple type #{simple}")
    end
  else
    raise CBOR::CborError.new("Unknown major type #{major}")
  end
end