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


#include "TLVEncoder.h"
#include "TLVDecoder.h"
#include "TrackingAreaUpdateRequest.h"

int decode_tracking_area_update_request(tracking_area_update_request_msg *tracking_area_update_request, 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, TRACKING_AREA_UPDATE_REQUEST_MINIMUM_LENGTH, len);

    /* Decoding mandatory fields */
    if ((decoded_result = decode_u8_eps_update_type(&tracking_area_update_request->epsupdatetype, 0, *(buffer + decoded) >> 4, len - decoded)) < 0)
        return decoded_result;

    if ((decoded_result = decode_u8_nas_key_set_identifier(&tracking_area_update_request->naskeysetidentifier, 0, *(buffer + decoded) & 0x0f, len - decoded)) < 0)
        return decoded_result;

    decoded++;
    if ((decoded_result = decode_eps_mobile_identity(&tracking_area_update_request->oldguti, 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 TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_IEI:
                if ((decoded_result =
                    decode_nas_key_set_identifier(&tracking_area_update_request->noncurrentnativenaskeysetidentifier,
                    TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_IEI,
                    buffer + decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_IEI:
                if ((decoded_result =
                    decode_ciphering_key_sequence_number(&tracking_area_update_request->gprscipheringkeysequencenumber,
                    TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_IEI,
                    buffer + decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_IEI:
                if ((decoded_result =
                    decode_p_tmsi_signature(&tracking_area_update_request->oldptmsisignature,
                    TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_IEI,
                    buffer + decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_IEI:
                if ((decoded_result =
                    decode_eps_mobile_identity(&tracking_area_update_request->additionalguti,
                    TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_IEI, buffer +
                    decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_NONCEUE_IEI:
                if ((decoded_result =
                    decode_nonce(&tracking_area_update_request->nonceue,
                    TRACKING_AREA_UPDATE_REQUEST_NONCEUE_IEI, buffer + decoded,
                    len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_NONCEUE_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_IEI:
                if ((decoded_result =
                    decode_ue_network_capability(&tracking_area_update_request->uenetworkcapability,
                    TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_IEI,
                    buffer + decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_IEI:
                if ((decoded_result =
                    decode_tracking_area_identity(&tracking_area_update_request->lastvisitedregisteredtai,
                    TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_IEI,
                    buffer + decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_IEI:
                if ((decoded_result =
                    decode_drx_parameter(&tracking_area_update_request->drxparameter,
                    TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_IEI, buffer +
                    decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_IEI:
                if ((decoded_result =
                    decode_ue_radio_capability_information_update_needed(&tracking_area_update_request->ueradiocapabilityinformationupdateneeded,
                    TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_IEI,
                    buffer + decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_IEI:
                if ((decoded_result =
                    decode_eps_bearer_context_status(&tracking_area_update_request->epsbearercontextstatus,
                    TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_IEI,
                    buffer + decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_IEI:
                if ((decoded_result =
                    decode_ms_network_capability(&tracking_area_update_request->msnetworkcapability,
                    TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_IEI,
                    buffer + decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_IEI:
                if ((decoded_result =
                    decode_location_area_identification(&tracking_area_update_request->oldlocationareaidentification,
                    TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_IEI,
                    buffer + decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_IEI:
                if ((decoded_result =
                    decode_tmsi_status(&tracking_area_update_request->tmsistatus,
                    TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_IEI, buffer +
                    decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_IEI:
                if ((decoded_result =
                    decode_mobile_station_classmark_2(&tracking_area_update_request->mobilestationclassmark2,
                    TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_IEI,
                    buffer + decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_IEI:
                if ((decoded_result =
                    decode_mobile_station_classmark_3(&tracking_area_update_request->mobilestationclassmark3,
                    TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_IEI,
                    buffer + decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_IEI:
                if ((decoded_result =
                    decode_supported_codec_list(&tracking_area_update_request->supportedcodecs,
                    TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_IEI, buffer +
                    decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_PRESENT;
                break;
            case TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_IEI:
                if ((decoded_result =
                    decode_additional_update_type(&tracking_area_update_request->additionalupdatetype,
                    TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_IEI,
                    buffer + decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_PRESENT;
                break;

	    case TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_IEI:
		if ((decoded_result = 
		     decode_guti_type(&tracking_area_update_request->oldgutitype,
				TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_IEI,
				buffer + decoded, len - decoded)) <= 0)
                    return decoded_result;
                decoded += decoded_result;
                /* Set corresponding mask to 1 in presencemask */
                tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_PRESENT;
		break;

            default:
                errorCodeDecoder = TLV_DECODE_UNEXPECTED_IEI;
                return TLV_DECODE_UNEXPECTED_IEI;
        }
    }
    return decoded;
}

int encode_tracking_area_update_request(tracking_area_update_request_msg *tracking_area_update_request, uint8_t *buffer, uint32_t len)
{
    int encoded = 0;
    int encode_result = 0;

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

    *(buffer + encoded) = ((encode_u8_eps_update_type(&tracking_area_update_request->epsupdatetype) & 0x0f) << 4) | (encode_u8_nas_key_set_identifier(&tracking_area_update_request->naskeysetidentifier) & 0x0f);
    encoded++;
    if ((encode_result =
         encode_eps_mobile_identity(&tracking_area_update_request->oldguti, 0,
         buffer + encoded, len - encoded)) < 0)        //Return in case of error
        return encode_result;
    else
        encoded += encode_result;

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_PRESENT)
    {
        if ((encode_result =
             encode_nas_key_set_identifier(&tracking_area_update_request->noncurrentnativenaskeysetidentifier,
             TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_IEI,
             buffer + encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_PRESENT)
    {
        if ((encode_result =
             encode_ciphering_key_sequence_number(&tracking_area_update_request->gprscipheringkeysequencenumber,
             TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_IEI,
             buffer + encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_PRESENT)
    {
        if ((encode_result =
             encode_p_tmsi_signature(&tracking_area_update_request->oldptmsisignature,
             TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_IEI, buffer +
             encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_PRESENT)
    {
        if ((encode_result =
             encode_eps_mobile_identity(&tracking_area_update_request->additionalguti,
             TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_IEI, buffer +
             encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_NONCEUE_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_NONCEUE_PRESENT)
    {
        if ((encode_result =
             encode_nonce(&tracking_area_update_request->nonceue,
             TRACKING_AREA_UPDATE_REQUEST_NONCEUE_IEI, buffer + encoded, len -
             encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_PRESENT)
    {
        if ((encode_result =
             encode_ue_network_capability(&tracking_area_update_request->uenetworkcapability,
             TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_IEI, buffer +
             encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_PRESENT)
    {
        if ((encode_result =
             encode_tracking_area_identity(&tracking_area_update_request->lastvisitedregisteredtai,
             TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_IEI,
             buffer + encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_PRESENT)
    {
        if ((encode_result =
             encode_drx_parameter(&tracking_area_update_request->drxparameter,
             TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_IEI, buffer + encoded,
             len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_PRESENT)
    {
        if ((encode_result =
             encode_ue_radio_capability_information_update_needed(&tracking_area_update_request->ueradiocapabilityinformationupdateneeded,
             TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_IEI,
             buffer + encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_PRESENT)
    {
        if ((encode_result =
             encode_eps_bearer_context_status(&tracking_area_update_request->epsbearercontextstatus,
             TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_IEI, buffer
             + encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_PRESENT)
    {
        if ((encode_result =
             encode_ms_network_capability(&tracking_area_update_request->msnetworkcapability,
             TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_IEI, buffer +
             encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_PRESENT)
    {
        if ((encode_result =
             encode_location_area_identification(&tracking_area_update_request->oldlocationareaidentification,
             TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_IEI,
             buffer + encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_PRESENT)
    {
        if ((encode_result =
             encode_tmsi_status(&tracking_area_update_request->tmsistatus,
             TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_IEI, buffer + encoded,
             len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_PRESENT)
    {
        if ((encode_result =
             encode_mobile_station_classmark_2(&tracking_area_update_request->mobilestationclassmark2,
             TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_IEI,
             buffer + encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_PRESENT)
    {
        if ((encode_result =
             encode_mobile_station_classmark_3(&tracking_area_update_request->mobilestationclassmark3,
             TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_IEI,
             buffer + encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_PRESENT)
    {
        if ((encode_result =
             encode_supported_codec_list(&tracking_area_update_request->supportedcodecs,
             TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_IEI, buffer +
             encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

    if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_PRESENT)
    {
        if ((encode_result =
             encode_additional_update_type(&tracking_area_update_request->additionalupdatetype,
             TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_IEI, buffer +
             encoded, len - encoded)) < 0)
            // Return in case of error
            return encode_result;
        else
            encoded += encode_result;
    }

     if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_PRESENT)
        == TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_PRESENT)
     {
	 if ((encode_result =
	      encode_guti_type(&tracking_area_update_request->oldgutitype,
			       TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_IEI,
			       buffer + encoded, len - encoded)) < 0)
	     // Return in case of error
	     return encode_result;
	 else
	     encoded += encode_result;
     }

    return encoded;
}

