/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under
 * the OAI Public License, Version 1.1  (the "License"); you may not use this file
 * except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.openairinterface.org/?page_id=698
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *-------------------------------------------------------------------------------
 * For more information about the OpenAirInterface (OAI) Software Alliance:
 *      contact@openairinterface.org
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>


#include "TLVEncoder.h"
#include "TLVDecoder.h"
#include "ServiceRequest.h"

int decode_service_request(service_request_msg *service_request, uint8_t *buffer, uint32_t len)
{
  uint32_t decoded = 0;
  int decoded_result = 0;

  LOG_FUNC_IN;
  // Check if we got a NULL pointer and if buffer length is >= minimum length expected for the message.
  CHECK_PDU_POINTER_AND_LENGTH_DECODER(buffer, SERVICE_REQUEST_MINIMUM_LENGTH, len);

  /* Decoding mandatory fields */
  if ((decoded_result = decode_ksi_and_sequence_number(&service_request->ksiandsequencenumber, 0, buffer + decoded, len - decoded)) < 0)
    LOG_FUNC_RETURN(decoded_result);
  else
    decoded += decoded_result;

  if ((decoded_result = decode_short_mac(&service_request->messageauthenticationcode, 0, buffer + decoded, len - decoded)) < 0)
    LOG_FUNC_RETURN(decoded_result);
  else
    decoded += decoded_result;

  LOG_FUNC_RETURN(decoded);
}

int encode_service_request(service_request_msg *service_request, uint8_t *buffer, uint32_t len)
{
  int encoded = 0;
  int encode_result = 0;

  LOG_FUNC_IN;
  /* Checking IEI and pointer */
  CHECK_PDU_POINTER_AND_LENGTH_ENCODER(buffer, SERVICE_REQUEST_MINIMUM_LENGTH, len);

  if ((encode_result =
         encode_ksi_and_sequence_number(&service_request->ksiandsequencenumber,
                                        0, buffer + encoded, len - encoded)) < 0)        //Return in case of error
    LOG_FUNC_RETURN(encode_result);
  else
    encoded += encode_result;

  if ((encode_result =
         encode_short_mac(&service_request->messageauthenticationcode, 0,
                          buffer + encoded, len - encoded)) < 0)        //Return in case of error
    LOG_FUNC_RETURN(encode_result);
  else
    encoded += encode_result;

  LOG_FUNC_RETURN(encoded);
}