24 lines
500 B
Matlab
24 lines
500 B
Matlab
|
function ret = crc32(bits)
|
||
|
|
poly = [1 de2bi(hex2dec('EDB88320'), 32)]';
|
||
|
|
bits = bits(:);
|
||
|
|
|
||
|
|
% Flip first 32 bits
|
||
|
|
bits(1:32) = 1 - bits(1:32);
|
||
|
|
% Add 32 zeros at the back
|
||
|
|
bits = [bits; zeros(32,1)];
|
||
|
|
|
||
|
|
% Initialize remainder to 0
|
||
|
|
rem = zeros(32,1);
|
||
|
|
% Main compution loop for the CRC32
|
||
|
|
for i = 1:length(bits)
|
||
|
|
rem = [rem; bits(i)]; %#ok<AGROW>
|
||
|
|
if rem(1) == 1
|
||
|
|
rem = xor(rem,poly);%mod(rem + poly, 2);
|
||
|
|
end
|
||
|
|
rem = rem(2:33);
|
||
|
|
end
|
||
|
|
|
||
|
|
% Flip the remainder before returning it
|
||
|
|
ret = 1 - rem;
|
||
|
|
end
|