text: /*
   * 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 terms found in the LICENSE file in the root of this source tree.
   *
   * 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 <stdbool.h>
  #include <stdint.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include "EsmCause.h"
  #include "bstrlib.h"
  
  #include "3gpp_24.007.h"
  #include "3gpp_24.301.h"
  #include "PdnDisconnectReject.h"
  #include "TLVDecoder.h"
  #include "TLVEncoder.h"
  #include "log.h"
  
  int decode_pdn_disconnect_reject(
      pdn_disconnect_reject_msg* pdn_disconnect_reject, uint8_t* buffer,
      uint32_t len) {
    uint32_t decoded = 0;
    int decoded_result = 0;
  
    // 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, PDN_DISCONNECT_REJECT_MINIMUM_LENGTH, len);
  
    /*
     * Decoding mandatory fields
     */
    if ((decoded_result = decode_esm_cause(&pdn_disconnect_reject->esmcause, 0,
                                           buffer + decoded, len - decoded)) < 0)
      return decoded_result;
    else
      decoded += decoded_result;
  
    /*
     * Decoding optional fields
     */
    while (len - decoded > 0) {
      uint8_t ieiDecoded = *(buffer + decoded);
  
      /*
       * Type | value iei are below 0x80 so just return the first 4 bits
       */
      if (ieiDecoded >= 0x80) ieiDecoded = ieiDecoded & 0xf0;
  
      switch (ieiDecoded) {
        case PDN_DISCONNECT_REJECT_PROTOCOL_CONFIGURATION_OPTIONS_IEI:
          if ((decoded_result = decode_protocol_configuration_options_ie(
                   &pdn_disconnect_reject->protocolconfigurationoptions, true,
                   buffer + decoded, len - decoded)) <= 0)
            return decoded_result;
  
          decoded += decoded_result;
          /*
           * Set corresponding mask to 1 in presencemask
           */
          pdn_disconnect_reject->presencemask |=
              PDN_DISCONNECT_REJECT_PROTOCOL_CONFIGURATION_OPTIONS_PRESENT;
          break;
  
        default:
          errorCodeDecoder = TLV_UNEXPECTED_IEI;
          return TLV_UNEXPECTED_IEI;
      }
    }
  
    return decoded;
  }
  
  int encode_pdn_disconnect_reject(
      pdn_disconnect_reject_msg* pdn_disconnect_reject, uint8_t* buffer,
      uint32_t len) {
    int encoded = 0;
    int encode_result = 0;
  
    /*
     * Checking IEI and pointer
     */
    CHECK_PDU_POINTER_AND_LENGTH_ENCODER(
        buffer, PDN_DISCONNECT_REJECT_MINIMUM_LENGTH, len);
  
    if ((encode_result = encode_esm_cause(&pdn_disconnect_reject->esmcause, 0,
                                          buffer + encoded, len - encoded)) <
        0)  // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  
    if ((pdn_disconnect_reject->presencemask &
         PDN_DISCONNECT_REJECT_PROTOCOL_CONFIGURATION_OPTIONS_PRESENT) ==
        PDN_DISCONNECT_REJECT_PROTOCOL_CONFIGURATION_OPTIONS_PRESENT) {
      if ((encode_result = encode_protocol_configuration_options_ie(
               &pdn_disconnect_reject->protocolconfigurationoptions, true,
               buffer + encoded, len - encoded)) < 0)
        // Return in case of error
        return encode_result;
      else
        encoded += encode_result;
    }
  
    return encoded;
  }
  