File: python-typemaps.txt

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/* Typemap definitions to allow SWIG to properly handle some data types */

// typemap for an incoming buffer
%typemap(in) (void *buf, size_t size) {
   if (PyInt_Check($input)) {
      $2 = PyInt_AsLong($input);
   } else if (PyLong_Check($input)) {
      $2 = PyLong_AsLong($input);
   } else {
      PyErr_SetString(PyExc_ValueError, "Expecting an integer or long object");
      return NULL;
   }
   if ($2 <= 0) {
       PyErr_SetString(PyExc_ValueError, "Positive integer expected");
       return NULL;
   }
   $1 = (void *) malloc($2);
}

// Return the buffer. Discarding any previous return result
%typemap(argout) (void *buf, size_t size) {
   Py_XDECREF($result);   /* Blow away any previous result */
   if (result == 0) {
      $result = Py_None;
      Py_INCREF($result);
   } else {
      PyObject *py_bytes = PyBytes_FromStringAndSize(reinterpret_cast<const char*>($1), result);
      $result = py_bytes;
   }
   free($1);
}