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///////////////////////////////
// base-64 encoding //
///////////////////////////////
function [enc]=encoding_table()
a = ascii('A')
enc = []
for i=0:25
enc(i+1) = i+a
end
for i=26:51
enc(i+1) = i+a+6
end
for i=52:61
enc(i+1) = i-52+ascii('0')
end
enc(63) = ascii('+')
enc(64) = ascii('/')
endfunction
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