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barcodes-code128's Introduction

Code 128 Barcodes in Haskell

This is a Haskell library for generating Code 128 barcodes in PDF format, which is described on Wikipedia.

The width of the stripes and the height of the barcode are configurable. Two modes of operation are supported:

  • Constructing a PDF directly in a ByteString, and
  • Constructing an action in HPDF’s Draw monad, for composing the barcode with other drawings.

Simple heuristics are used to choose efficient coding schemes. However, the encoding is not presently optimal.

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