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