code: @VisibleForTesting
  	static byte[] ascii8To6bitBin(byte[] toDecBytes) {
  
  		byte[] convertedBytes = new byte[toDecBytes.length];
  		int sum = 0;
  		int _6bitBin = 0;
  
  		for (int i = 0; i < toDecBytes.length; i++) {
  			sum = 0;
  			_6bitBin = 0;
  
  			if (toDecBytes[i] < 48) {
  				throw new AisParseException(AisParseException.INVALID_CHARACTER + " "
  				        + (char) toDecBytes[i]);
  			} else {
  				if (toDecBytes[i] > 119) {
  					throw new AisParseException(AisParseException.INVALID_CHARACTER + " "
  					        + (char) toDecBytes[i]);
  				} else {
  					if (toDecBytes[i] > 87) {
  						if (toDecBytes[i] < 96) {
  							throw new AisParseException(AisParseException.INVALID_CHARACTER + " "
  							        + (char) toDecBytes[i]);
  						} else {
  							sum = toDecBytes[i] + 40;
  						}
  					} else {
  						sum = toDecBytes[i] + 40;
  					}
  					if (sum != 0) {
  						if (sum > 128) {
  							sum += 32;
  						} else {
  							sum += 40;
  						}
  						_6bitBin = sum & 0x3F;
  						convertedBytes[i] = (byte) _6bitBin;
  					}
  				}
  			}
  		}
  
  		return convertedBytes;
  	}
docs: Returns conversion of ASCII-coded character to 6-bit binary byte array.
  
  @param toDecBytes
  @return decodedBytes