openairinterface5g/openair3/NAS/COMMON/EMM/MSG/EmmInformation.c

/*
 * SPDX-License-Identifier: LicenseRef-CSSL-1.0
 */

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


#include "TLVEncoder.h"
#include "TLVDecoder.h"
#include "EmmInformation.h"

int decode_emm_information(emm_information_msg *emm_information, 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, EMM_INFORMATION_MINIMUM_LENGTH, len);

  /* Decoding mandatory fields */
  /* 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 EMM_INFORMATION_FULL_NAME_FOR_NETWORK_IEI:
      if ((decoded_result =
             decode_network_name(&emm_information->fullnamefornetwork,
                                 EMM_INFORMATION_FULL_NAME_FOR_NETWORK_IEI, buffer +
                                 decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      emm_information->presencemask |= EMM_INFORMATION_FULL_NAME_FOR_NETWORK_PRESENT;
      break;

    case EMM_INFORMATION_SHORT_NAME_FOR_NETWORK_IEI:
      if ((decoded_result =
             decode_network_name(&emm_information->shortnamefornetwork,
                                 EMM_INFORMATION_SHORT_NAME_FOR_NETWORK_IEI, buffer +
                                 decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      emm_information->presencemask |= EMM_INFORMATION_SHORT_NAME_FOR_NETWORK_PRESENT;
      break;

    case EMM_INFORMATION_LOCAL_TIME_ZONE_IEI:
      if ((decoded_result =
             decode_time_zone(&emm_information->localtimezone,
                              EMM_INFORMATION_LOCAL_TIME_ZONE_IEI, buffer + decoded, len
                              - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      emm_information->presencemask |= EMM_INFORMATION_LOCAL_TIME_ZONE_PRESENT;
      break;

    case EMM_INFORMATION_UNIVERSAL_TIME_AND_LOCAL_TIME_ZONE_IEI:
      if ((decoded_result =
             decode_time_zone_and_time(&emm_information->universaltimeandlocaltimezone,
                                       EMM_INFORMATION_UNIVERSAL_TIME_AND_LOCAL_TIME_ZONE_IEI,
                                       buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      emm_information->presencemask |= EMM_INFORMATION_UNIVERSAL_TIME_AND_LOCAL_TIME_ZONE_PRESENT;
      break;

    case EMM_INFORMATION_NETWORK_DAYLIGHT_SAVING_TIME_IEI:
      if ((decoded_result =
             decode_daylight_saving_time(&emm_information->networkdaylightsavingtime,
                                         EMM_INFORMATION_NETWORK_DAYLIGHT_SAVING_TIME_IEI, buffer +
                                         decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      emm_information->presencemask |= EMM_INFORMATION_NETWORK_DAYLIGHT_SAVING_TIME_PRESENT;
      break;

    default:
      errorCodeDecoder = TLV_DECODE_UNEXPECTED_IEI;
      return TLV_DECODE_UNEXPECTED_IEI;
    }
  }

  return decoded;
}

int encode_emm_information(emm_information_msg *emm_information, uint8_t *buffer, uint32_t len)
{
  int encoded = 0;
  int encode_result = 0;

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

  if ((emm_information->presencemask & EMM_INFORMATION_FULL_NAME_FOR_NETWORK_PRESENT)
      == EMM_INFORMATION_FULL_NAME_FOR_NETWORK_PRESENT) {
    if ((encode_result =
           encode_network_name(&emm_information->fullnamefornetwork,
                               EMM_INFORMATION_FULL_NAME_FOR_NETWORK_IEI, buffer + encoded, len -
                               encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((emm_information->presencemask & EMM_INFORMATION_SHORT_NAME_FOR_NETWORK_PRESENT)
      == EMM_INFORMATION_SHORT_NAME_FOR_NETWORK_PRESENT) {
    if ((encode_result =
           encode_network_name(&emm_information->shortnamefornetwork,
                               EMM_INFORMATION_SHORT_NAME_FOR_NETWORK_IEI, buffer + encoded, len
                               - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((emm_information->presencemask & EMM_INFORMATION_LOCAL_TIME_ZONE_PRESENT)
      == EMM_INFORMATION_LOCAL_TIME_ZONE_PRESENT) {
    if ((encode_result = encode_time_zone(&emm_information->localtimezone,
                                          EMM_INFORMATION_LOCAL_TIME_ZONE_IEI, buffer + encoded, len -
                                          encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((emm_information->presencemask & EMM_INFORMATION_UNIVERSAL_TIME_AND_LOCAL_TIME_ZONE_PRESENT)
      == EMM_INFORMATION_UNIVERSAL_TIME_AND_LOCAL_TIME_ZONE_PRESENT) {
    if ((encode_result =
           encode_time_zone_and_time(&emm_information->universaltimeandlocaltimezone,
                                     EMM_INFORMATION_UNIVERSAL_TIME_AND_LOCAL_TIME_ZONE_IEI, buffer +
                                     encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((emm_information->presencemask & EMM_INFORMATION_NETWORK_DAYLIGHT_SAVING_TIME_PRESENT)
      == EMM_INFORMATION_NETWORK_DAYLIGHT_SAVING_TIME_PRESENT) {
    if ((encode_result =
           encode_daylight_saving_time(&emm_information->networkdaylightsavingtime,
                                       EMM_INFORMATION_NETWORK_DAYLIGHT_SAVING_TIME_IEI, buffer +
                                       encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  return encoded;
}