################################################################################
#
# Copyright (C) 2006 Peter J Jones (pjones@pmade.com)
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
# 
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
################################################################################

class PDF::Reader
  ################################################################################
  # An internal PDF::Reader class that represents an indirect reference to a PDF Object 
  class Reference
    ################################################################################
    # check if the next token in the buffer is a reference, and return a PDF::Reader::Reference
    # instance. Returns nil if the next token isn't an indirect reference.
    def self.from_buffer (buffer)
      buffer.ready_token
      return nil unless m = buffer.raw.match(/^(\d+)\s+(\d+)\s+R\b/)
      buffer.head(m[0].size)
      self.new(m[1].to_i, m[2].to_i)
    end
    ################################################################################
    attr_reader :id, :gen
    ################################################################################
    # Create a new Reference to an object with the specified id and revision number
    def initialize (id, gen)
      @id, @gen = id, gen
    end
    ################################################################################
    # returns the current Reference object in an array with a single element
    def to_a
      [self]
    end
    ################################################################################
  end
  ################################################################################
end
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