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来自「PDF417编码的算法的源程序」· 代码 · 共 31 行

  This is the appendix P preprocessor contributed by Mark Brand.
It takes a stdin stream of input data and converts it into a form
that can be used by pdf417.


  You can use this as a preprocessor.   Also, this code has been
incorporated into the pdf417 library as well in the form of
the pdf417_prep_to_raw routine.   You can use a stream and the
annex P algorith to generate the inputs to pdf417.

   first call

     pdf417_init_arrays();

  the

    pdf417_prep_to_raw( buffer, buffer_len );


 then

   pdf417_en( ...   );    // to create the symbol

  or 

  pdf417_en_new(  );   to create a symbol