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Support for different positions of special characters when decoding #8

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Support for different positions of special characters when decoding #8

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8 changes: 5 additions & 3 deletions base64.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -109,14 +109,16 @@ function base64.encode( str, encoder, usecaching )
return concat( t )
end

function base64.decode( b64, decoder, usecaching )
function base64.decode( b64, decoder, usecaching, schar1pos, schar2pos )
decoder = decoder or DEFAULT_DECODER
schar1pos = schar1pos or 62
schar2pos = schar2pos or 63
local pattern = '[^%w%+%/%=]'
if decoder then
local s62, s63
for charcode, b64code in pairs( decoder ) do
if b64code == 62 then s62 = charcode
elseif b64code == 63 then s63 = charcode
if b64code == schar1pos then s62 = charcode
elseif b64code == schar2pos then s63 = charcode
end
end
pattern = ('[^%%w%%%s%%%s%%=]'):format( char(s62), char(s63) )
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