Class: GVariantOffsetType

Inherits:
GVariantBasicType show all
Defined in:
lib/gvariant.rb

Instance Attribute Summary

Attributes inherited from GVariantBasicType

#alignment, #default_value, #fixed_size, #id

Instance Method Summary collapse

Methods inherited from GVariantBasicType

#align, #read

Constructor Details

#initialize(id, alignment, default_value) ⇒ GVariantOffsetType

Returns a new instance of GVariantOffsetType.



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# File 'lib/gvariant.rb', line 124

def initialize(id, alignment, default_value)
  @offset_size = nil
  super(id, nil, alignment, nil, default_value)
end

Instance Method Details

#read_offset(buf, n) ⇒ Object 



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# File 'lib/gvariant.rb', line 129

def read_offset(buf, n)
  l = buf.length

  if @offset_size.nil?
    if (l < 0xff)
      @offset_size = 1
      @offset_unpack = 'C'
    elsif (l <= 0xffff)
      @offset_size = 2
      @offset_unpack = 'S'
    elsif (l < 0xffffffff)
      @offset_size = 4
      @offset_unpack = 'L'
    else
      raise ArgumentError.new("Offset range too big.")
    end
  end

  buf.unpack("@#{l + @offset_size * n}#{@offset_unpack}")[0]
end