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local convert
arg = arg or {}
local mode = arg and arg[1] or "-et"
if mode == "-et" then
local normalize = mime.normalize()
local qp = mime.encode("quoted-printable")
local wrap = mime.wrap("quoted-printable")
convert = ltn12.filter.chain(normalize, qp, wrap)
elseif mode == "-eb" then
local qp = mime.encode("quoted-printable", "binary")
local wrap = mime.wrap("quoted-printable")
convert = ltn12.filter.chain(qp, wrap)
else convert = mime.decode("quoted-printable") end
local source = ltn12.source.chain(ltn12.source.file(io.stdin), convert)
local sink = ltn12.sink.file(io.stdout)
ltn12.pump(source, sink)
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