40 lines
728 B
Ruby
40 lines
728 B
Ruby
module Zip
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class DecryptedIo #:nodoc:all
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CHUNK_SIZE = 32_768
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def initialize(io, decrypter)
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@io = io
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@decrypter = decrypter
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end
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def read(length = nil, outbuf = +'')
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return ((length.nil? || length.zero?) ? "" : nil) if eof
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while length.nil? || (buffer.bytesize < length)
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break if input_finished?
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buffer << produce_input
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end
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outbuf.replace(buffer.slice!(0...(length || output_buffer.bytesize)))
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end
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private
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def eof
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buffer.empty? && input_finished?
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end
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def buffer
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@buffer ||= +''
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end
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def input_finished?
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@io.eof
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end
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def produce_input
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@decrypter.decrypt(@io.read(CHUNK_SIZE))
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end
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end
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end
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