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This is the size and encoding that Royal Mail wants on all mail from October 1st 2015.
see https://bitbucket.org/rptlab/reportlab/issues/69/implementations-of-code-128-auto-and-data
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This method is basically verbatim from "huBarcode" which is BSD licensed
https://github.com/hudora/huBarcode/blob/master/hubarcode/datamatrix/reedsolomon.py
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This method is heavily influenced by "huBarcode" which is BSD licensed
https://github.com/hudora/huBarcode/blob/master/hubarcode/datamatrix/placement.py
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