luasocket/etc/b64.lua

-----------------------------------------------------------------------------
-- Little program to convert to and from Base64
-- LuaSocket sample files
-- Author: Diego Nehab
-----------------------------------------------------------------------------
local ltn12 = require("ltn12")
local mime = 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)