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typedef unsigned long sample;

struct pam

{

  sample maxval;

};

typedef sample *tuple;

enum function

  {

    FN_MULTIPLY, FN_DIVIDE, FN_ADD, FN_SUBTRACT, FN_MIN, FN_MAX, FN_AND, FN_OR,

    FN_XOR, FN_NOT, FN_SHIFTLEFT, FN_SHIFTRIGHT

  };

struct cmdlineInfo

{

  enum function function;

  union

  {

    float divisor;

    unsigned int shiftCount;

  }

    u;

};

applyFunction (struct cmdlineInfo const cmdline, struct pam const inpam,

               struct pam const outpam, tuple * const inputRow,

               tuple * const outputRow)

{

  float const oneOverDivisor = 1 / cmdline.u.divisor;

  int col;

  {

    int plane;

    {

      sample const inSample = inputRow[col][plane];

      sample outSample;

      switch (cmdline.function)

        {

        case FN_DIVIDE:

          outSample = ((unsigned int) ((inSample * oneOverDivisor) + 0.5));

          break;

        case FN_SHIFTLEFT:

          outSample = (inSample << cmdline.u.shiftCount) & outpam.maxval;

        }

      outputRow[col][plane] =

        ((outpam.maxval) < (outSample) ? (outpam.maxval) : (outSample));

    }

  }

}