/usr/share/octave/site/m/octave-epstk/evec2b64.m is in octave-epstk 2.4-3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | % evec2b64(vector)
% converts binary vector to base64 vector
% written by stefan.mueller@fhr.fraunhofer.de (C) 2010
function [b64code,nTuples]=evec2b64(bincode)
if (nargin~=1)
eusage('[b64Vector nTuples]=evec2b64(binVector)');
end
[n m]=size(bincode);
if n==1
bincode=bincode';
trans=1;
n=m;
else
trans=0;
end
nTuples=ceil(n/3);
nTail=nTuples*3-n;
if nTail>0
bincode=[bincode;zeros(nTail,1)];
end
b64code=[reshape(bincode,3,nTuples);zeros(1,nTuples)];
tupSum=b64code(3,:)+bitshift(b64code(2,:),8)+...
bitshift(b64code(1,:),16);
b64code(1,:)=bitshift(tupSum,-18);
tupSum=tupSum-bitshift(b64code(1,:),18);
b64code(2,:)=bitshift(tupSum,-12);
tupSum=tupSum-bitshift(b64code(2,:),12);
b64code(3,:)=bitshift(tupSum,-6);
b64code(4,:)=tupSum-bitshift(b64code(3,:),6);
b64code=reshape(b64code,4*nTuples,1);
if trans
b64code=b64code';
end
% trans='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
% b64code=trans(b64code(:)+1);
if nTail>0
e=nTuples*4;
b64code(e-nTail+1:e)=64;
end
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