How do I free up the decoder's output buffer?

If you did not pre-allocate your own output buffer for the decoder, you can simply call the ossFreePDU() function to free it up. The code for this looks like:

MyASN1DataType *DecodedDataPtr = NULL; /* address of decoded data */
  . . . .
  rc = ossDecode(world, &myPduNum, &encodedData, (void **)&DecodedDataPtr);
  . . . .
  ossFreePDU(world, myPduNum, DecodedDataPtr); /* free up PDU */

On the other hand, if you allocated your own output buffer using malloc() or calloc(), you should not use ossFreePDU() to free it. Instead, you should use another deallocating function (e.g., free()) to free this allocated memory. The code for this procedure typically looks like:

MyASN1DataType *DecodedDataPtr = NULL; /* address of decoded data */;
  . . . .
  DecodedDataPtr = (MyASN1DataType*)malloc(1024*sizeof(char));
  ossSetDecodingLength(world, 1024);
  rc = ossDecode(world, &myPduNum, &encodedData, (void **)&DecodedDataPtr);
  . . . .
  free(DecodedDataPtr);

The samples included with some of the Knowledge Center answers are meant for your general understanding of the OSS products. Different versions of the products might produce slightly different outputs. Consult the products documentation and samples for the most up-to-date products information and code examples.