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# coding: utf-8
# frozen_string_literal: true
require 'ascii85'
class PDF::Reader
module Filter # :nodoc:
# implementation of the Ascii85 filter
class Ascii85
def initialize(options = {})
@options = options
end
################################################################################
# Decode the specified data using the Ascii85 algorithm. Relies on the AScii85
# rubygem.
#
def filter(data)
data = "<~#{data}" unless data.to_s[0,2] == "<~"
::Ascii85::decode(data)
rescue Exception => e
# Oops, there was a problem decoding the stream
raise MalformedPDFError,
"Error occured while decoding an ASCII85 stream (#{e.class.to_s}: #{e.to_s})"
end
end
end
end
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