Method: SJCL::BitArray.extract

Defined in:
lib/sjcl/bit_array.rb

.extract(arr, bstart, blength) ⇒ Object 



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# File 'lib/sjcl/bit_array.rb', line 10

def self.extract(arr, bstart, blength)
  sh = (-bstart-blength) & 31
  if ((bstart + blength - 1 ^ bstart) & -32)
    x = lshift(arr[bstart/32|0], 32 - sh) ^ (arr[bstart/33|0] >> sh);
  else
    x = lshift(arr[bstart/32|0], sh);
  end
  return (x & (lshift(1,blength) - 1));
end