class PDF::Core::Stream

Attributes

filters[R]

Public Class Methods

new(io = nil) click to toggle source
# File lib/pdf/core/stream.rb, line 14
def initialize(io = nil)
  @filtered_stream = ''
  @stream = io
  @filters = FilterList.new
end

Public Instance Methods

<<(io) click to toggle source
# File lib/pdf/core/stream.rb, line 20
def <<(io)
  (@stream ||= +'') << io
  @filtered_stream = nil
  self
end
compress!() click to toggle source
# File lib/pdf/core/stream.rb, line 26
def compress!
  unless @filters.names.include? :FlateDecode
    @filtered_stream = nil
    @filters << :FlateDecode
  end
end
compressed?() click to toggle source
# File lib/pdf/core/stream.rb, line 33
def compressed?
  @filters.names.include? :FlateDecode
end
data() click to toggle source
# File lib/pdf/core/stream.rb, line 71
def data
  if @stream
    filter_names = @filters.names
    filter_params = @filters.decode_params

    d = {
      Length: filtered_stream.length
    }
    if filter_names.any?
      d[:Filter] = filter_names
    end
    if filter_params.any? { |f| !f.nil? }
      d[:DecodeParms] = filter_params
    end

    d
  else
    {}
  end
end
empty?() click to toggle source
# File lib/pdf/core/stream.rb, line 37
def empty?
  @stream.nil?
end
filtered_stream() click to toggle source
# File lib/pdf/core/stream.rb, line 41
def filtered_stream
  if @stream
    if @filtered_stream.nil?
      @filtered_stream = @stream.dup

      @filters.each do |(filter_name, params)|
        filter = PDF::Core::Filters.const_get(filter_name)
        if filter
          @filtered_stream = filter.encode @filtered_stream, params
        end
      end
    end

    @filtered_stream
    # XXX Fillter stream
  end
end
inspect() click to toggle source
# File lib/pdf/core/stream.rb, line 92
def inspect
  format(
    '#<%<class>s:0x%<object_id>014x '\
      '@stream=%<stream>s, @filters=%<filters>s>',
    class: self.class.name,
    object_id: object_id,
    stream: @stream.inspect,
    filters: @filters.inspect
  )
end
length() click to toggle source
# File lib/pdf/core/stream.rb, line 59
def length
  @stream.length
end
object() click to toggle source
# File lib/pdf/core/stream.rb, line 63
def object
  if filtered_stream
    "stream\n#{filtered_stream}\nendstream\n"
  else
    ''
  end
end