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# coding: utf-8
# typed: strict
# frozen_string_literal: true
class PDF::Reader
# provides a wrapper around a PDF stream object that contains other objects in it.
# This is done for added compression and is described as an "Object Stream" in the spec.
#
class ObjectStream # :nodoc:
#: (PDF::Reader::Stream) -> void
def initialize(stream)
@dict = stream.hash #: Hash[Symbol, untyped]
@data = stream.unfiltered_data #: String
@offsets = nil #: Hash[Integer, Integer] | nil
@buffer = nil #: PDF::Reader::Buffer | nil
end
#: (Integer) -> (
#| PDF::Reader::Reference |
#| PDF::Reader::Token |
#| Numeric |
#| String |
#| Symbol |
#| Array[untyped] |
#| Hash[untyped, untyped] |
#| nil
#| )
def [](objid)
if offsets[objid].nil?
nil
else
buf = PDF::Reader::Buffer.new(StringIO.new(@data), :seek => offsets[objid])
parser = PDF::Reader::Parser.new(buf)
parser.parse_token
end
end
#: () -> Integer
def size
TypeCheck.cast_to_int!(@dict[:N])
end
private
#: () -> Hash[Integer, Integer]
def offsets
@offsets ||= {}
return @offsets if @offsets.keys.size > 0
size.times do
@offsets[buffer.token.to_i] = first + buffer.token.to_i
end
@offsets
end
#: () -> Integer
def first
TypeCheck.cast_to_int!(@dict[:First])
end
#: () -> PDF::Reader::Buffer
def buffer
@buffer ||= PDF::Reader::Buffer.new(StringIO.new(@data))
end
end
end
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