owner-nrf52sdk/nRF5_SDK_15.3.0/components/serialization/common/cond_field_serialization.c

/**
 * Copyright (c) 2014 - 2019, Nordic Semiconductor ASA
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
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 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
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 */
#include "nrf_error.h"
#include "cond_field_serialization.h"
#include "ble_serialization.h"
#include <stddef.h>

uint32_t cond_field_enc(void const * const      p_field,
                        uint8_t * const         p_buf,
                        uint32_t                buf_len,
                        uint32_t * const        p_index,
                        field_encoder_handler_t fp_field_encoder)
{
    uint32_t err_code = NRF_SUCCESS;

    SER_ASSERT_LENGTH_LEQ(*p_index + 1, buf_len);
    p_buf[*p_index] = (p_field == NULL) ? SER_FIELD_NOT_PRESENT : SER_FIELD_PRESENT;
    *p_index       += 1;

    if (p_field && (fp_field_encoder != NULL))
    {
        err_code = fp_field_encoder(p_field, p_buf, buf_len, p_index);
    }

    return err_code;
}


uint32_t cond_field_dec(uint8_t const * const   p_buf,
                        uint32_t                buf_len,
                        uint32_t * const        p_index,
                        void * * const          pp_field,
                        field_decoder_handler_t fp_field_decoder)
{
    uint32_t err_code = NRF_SUCCESS;
    uint8_t  is_present;

    SER_ASSERT_LENGTH_LEQ(1, buf_len - *p_index);
    uint8_dec(p_buf, buf_len, p_index, &is_present);

    if (is_present == SER_FIELD_PRESENT)
    {
        SER_ASSERT_NOT_NULL(pp_field);
        SER_ASSERT_NOT_NULL(*pp_field);

        if (fp_field_decoder != NULL)
        {
            err_code = fp_field_decoder(p_buf, buf_len, p_index, *pp_field);
        }
    }
    else if (is_present == SER_FIELD_NOT_PRESENT)
    {
        if (pp_field != NULL)
        {
            *pp_field = NULL;
        }
    }
    else
    {
        err_code = NRF_ERROR_INVALID_DATA;
    }

    return err_code;
}