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Using your S25 barcode generator I found a problem. The representation of the digit 8 was the same as 0. I fixed it. Now it is recognized correctly.
Additionally you were using different bar widths for the start and stop values. I changed this too.
One thing I did not change till now is the part where you add an leading 0 if the string is odd. Why do you do so? I can't find anything that S25 has to be even. Maybe you mixed it up with interleaved 2 of 5 bar code where you need the even number because the digits are represented from pairs of bars and whitespaces?