SplashError SplashBitmap::writePNMFile(char *fileName) {
  FILE *f;
  SplashError e;

  if (!(f = fopen(fileName, "wb"))) {
    return splashErrOpenFile;
  }

  e = this->writePNMFile(f);
  
  fclose(f);
  return e;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.