BASE64 ENCODING WIKIPEDIA CODE
The following code is not as fast as the mime C-Module - yet on smaller values the loading time can make a program slower, too. I want to apologize if somebody encountered a serious error with the former version of base64 - Not all logical functions can be easily replaced with mathematical ones, so I had to find a way around.
BASE64 ENCODING WIKIPEDIA HOW TO
If (#x ~= 8) then return '' end local c=0įor i=1,8 do c=c+(x:sub(i,i)= '1' and 2^(8-i) or 0) end return string.char(c)Įnd - command line if not called as library if (arg ~= nil) then local func = 'enc' for n,v in ipairs(arg) do if (n > 0) then if (v = "-h") then print "a text/data" break elseif (v = "-e") then func = 'enc' elseif (v = "-d") then func = 'dec' else print( _G(v)) end end end else module( 'base64', eall)īase64 is also implemented in the b64/ unb64 methods in LuaSocket ? ( ), but you may still want to use this snippet for its few requirements - and it is a nice example with educational value for how to perform logical operations without actual bit-shift or OR operators. Lua 5.1+ base64 v3.0 (c) 2009 by Alex Kloss - licensed under the terms of the LGPL2 - character table string local b= 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/' - encoding function enc(data)įor i=8,1,-1 do r=r.(b%2^i-b%2^(i-1)>0 and '1' or '0') end return r Įnd). Since the last implementation, I had a small competition for the smallest Base64 codec in JavaScript ? - converting the new results to lua gave the following, very small as fast codec: The following implementation provides some samples of Base64 encoder/decoder functions (for background see ). Lua-users wiki: Base Sixty Four Base Sixty Four
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