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require("ltn12")
require("mime")
local source = ltn12.source.file(io.stdin)
local sink = ltn12.sink.file(io.stdout)
local convert
if arg and arg[1] == '-d' then
convert = mime.decode("base64")
else
local base64 = mime.encode("base64")
local wrap = mime.wrap()
convert = ltn12.filter.chain(base64, wrap)
end
sink = ltn12.sink.chain(convert, sink)
ltn12.pump.all(source, sink)
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