owner-nrf52sdk/nRF5_SDK_15.2.0/components/iot/coap/coap_queue.c

/**
 * Copyright (c) 2014 - 2018, 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.
 *
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 *
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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 */
#include <string.h>

#include "coap_queue.h"
#include "iot_common.h"
#include "sdk_config.h"

#if (COAP_DISABLE_API_PARAM_CHECK == 0)

/**@brief Verify NULL parameters are not passed to API by application. */
#define NULL_PARAM_CHECK(PARAM)                                                                    \
    if ((PARAM) == NULL)                                                                           \
    {                                                                                              \
        return (NRF_ERROR_NULL | IOT_COAP_ERR_BASE);                                               \
    }
#else

#define NULL_PARAM_CHECK(PARAM)

#endif // COAP_DISABLE_API_PARAM_CHECK

static coap_queue_item_t m_queue[COAP_MESSAGE_QUEUE_SIZE];
static uint8_t           m_message_queue_count = 0;

uint32_t coap_queue_init(void)
{
    for (uint8_t i = 0; i < COAP_MESSAGE_QUEUE_SIZE; i++)
    {
        memset(&m_queue[i], 0, sizeof(coap_queue_item_t));
        m_queue[i].handle = i;
    }
    m_message_queue_count = 0;

    return NRF_SUCCESS;
}

uint32_t coap_queue_add(coap_queue_item_t * item)
{
    NULL_PARAM_CHECK(item);

    if (m_message_queue_count >= COAP_MESSAGE_QUEUE_SIZE)
    {
       return (NRF_ERROR_NO_MEM | IOT_COAP_ERR_BASE);
    }
    else
    {
        for (uint8_t i = 0; i < COAP_MESSAGE_QUEUE_SIZE; i++)
        {
            if (m_queue[i].p_buffer == NULL)
            {
                // Free spot in message queue. Add message here...
                memcpy(&m_queue[i], item, sizeof(coap_queue_item_t));

                m_message_queue_count++;

                return NRF_SUCCESS;
            }
        }

    }
    return (NRF_ERROR_DATA_SIZE | IOT_COAP_ERR_BASE);
}

uint32_t coap_queue_remove(coap_queue_item_t * p_item)
{
    for (uint8_t i = 0; i < COAP_MESSAGE_QUEUE_SIZE; i++)
    {
        if (p_item == (coap_queue_item_t *)&m_queue[i])
        {
            memset(&m_queue[i], 0, sizeof(coap_queue_item_t));
            m_message_queue_count--;
            return NRF_SUCCESS;
        }
    }

    return (NRF_ERROR_NOT_FOUND | IOT_COAP_ERR_BASE);
}

uint32_t coap_queue_item_by_token_get(coap_queue_item_t ** pp_item, uint8_t * p_token, uint8_t token_len)
{
    for (uint8_t i = 0; i < COAP_MESSAGE_QUEUE_SIZE; i++)
    {
        if (m_queue[i].token_len == token_len)
        {
            if ((0 != m_queue[i].token_len) &&
                (memcmp(m_queue[i].token, p_token, m_queue[i].token_len) == 0))
            {
                    *pp_item = &m_queue[i];
                    return NRF_SUCCESS;
            }
        }
    }

    return (NRF_ERROR_NOT_FOUND | IOT_COAP_ERR_BASE);
}


uint32_t coap_queue_item_by_mid_get(coap_queue_item_t ** pp_item, uint16_t message_id)
{


    for (uint8_t i = 0; i < COAP_MESSAGE_QUEUE_SIZE; i++)
    {
        if (m_queue[i].mid == message_id)
        {
            *pp_item = &m_queue[i];
            return NRF_SUCCESS;
        }
    }

    return (NRF_ERROR_NOT_FOUND | IOT_COAP_ERR_BASE);
}


uint32_t coap_queue_item_next_get(coap_queue_item_t ** pp_item, coap_queue_item_t * p_item)
{
    if (p_item == NULL)
    {
        for (uint8_t i = 0; i < COAP_MESSAGE_QUEUE_SIZE; i++)
        {
            if (m_queue[i].p_buffer != NULL)
            {
                (*pp_item) = &m_queue[i];
                return NRF_SUCCESS;
            }
        }
    }
    else
    {
        uint8_t index_to_previous = (uint8_t)(((uint32_t)p_item - (uint32_t)m_queue) / (uint32_t)sizeof(coap_queue_item_t));

        for (uint8_t i = index_to_previous + 1; i < COAP_MESSAGE_QUEUE_SIZE; i++)
        {
            if (m_queue[i].p_buffer != NULL)
            {
                (*pp_item) = &m_queue[i];
                return NRF_SUCCESS;
            }
        }
    }
    (*pp_item) = NULL;

    return (NRF_ERROR_NOT_FOUND | IOT_COAP_ERR_BASE);
}