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/*
* Amazon FreeRTOS MQTT V2.0.0
* Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* http://aws.amazon.com/freertos
* http://www.FreeRTOS.org
*/
/**
* @file iot_mqtt_static_memory.c
* @brief Implementation of MQTT static memory functions.
*/
/* The config header is always included first. */
#include "iot_config.h"
/* This file should only be compiled if dynamic memory allocation is forbidden. */
#if IOT_STATIC_MEMORY_ONLY == 1
/* Standard includes. */
#include <stdbool.h>
#include <stddef.h>
#include <string.h>
/* Static memory include. */
#include "private/iot_static_memory.h"
/* MQTT internal include. */
#include "private/iot_mqtt_internal.h"
/*-----------------------------------------------------------*/
/**
* @cond DOXYGEN_IGNORE
* Doxygen should ignore this section.
*
* Provide default values for undefined configuration constants.
*/
#ifndef IOT_MQTT_CONNECTIONS
#define IOT_MQTT_CONNECTIONS ( 1 )
#endif
#ifndef IOT_MQTT_MAX_IN_PROGRESS_OPERATIONS
#define IOT_MQTT_MAX_IN_PROGRESS_OPERATIONS ( 10 )
#endif
#ifndef IOT_MQTT_SUBSCRIPTIONS
#define IOT_MQTT_SUBSCRIPTIONS ( 8 )
#endif
/** @endcond */
/* Validate static memory configuration settings. */
#if IOT_MQTT_CONNECTIONS <= 0
#error "IOT_MQTT_CONNECTIONS cannot be 0 or negative."
#endif
#if IOT_MQTT_MAX_IN_PROGRESS_OPERATIONS <= 0
#error "IOT_MQTT_MAX_IN_PROGRESS_OPERATIONS cannot be 0 or negative."
#endif
#if IOT_MQTT_SUBSCRIPTIONS <= 0
#error "IOT_MQTT_SUBSCRIPTIONS cannot be 0 or negative."
#endif
/**
* @brief The size of a static memory MQTT subscription.
*
* Since the pTopic member of #_mqttSubscription_t is variable-length, the constant
* #AWS_IOT_MQTT_SERVER_MAX_TOPIC_LENGTH is used for the length of
* #_mqttSubscription_t.pTopicFilter.
*/
#define MQTT_SUBSCRIPTION_SIZE ( sizeof( _mqttSubscription_t ) + AWS_IOT_MQTT_SERVER_MAX_TOPIC_LENGTH )
/*-----------------------------------------------------------*/
/*
* Static memory buffers and flags, allocated and zeroed at compile-time.
*/
static bool _pInUseMqttConnections[ IOT_MQTT_CONNECTIONS ] = { 0 }; /**< @brief MQTT connection in-use flags. */
static _mqttConnection_t _pMqttConnections[ IOT_MQTT_CONNECTIONS ] = { { 0 } }; /**< @brief MQTT connections. */
static bool _pInUseMqttOperations[ IOT_MQTT_MAX_IN_PROGRESS_OPERATIONS ] = { 0 }; /**< @brief MQTT operation in-use flags. */
static _mqttOperation_t _pMqttOperations[ IOT_MQTT_MAX_IN_PROGRESS_OPERATIONS ] = { { .link = { 0 } } }; /**< @brief MQTT operations. */
static bool _pInUseMqttSubscriptions[ IOT_MQTT_SUBSCRIPTIONS ] = { 0 }; /**< @brief MQTT subscription in-use flags. */
static char _pMqttSubscriptions[ IOT_MQTT_SUBSCRIPTIONS ][ MQTT_SUBSCRIPTION_SIZE ] = { { 0 } }; /**< @brief MQTT subscriptions. */
/*-----------------------------------------------------------*/
void * IotMqtt_MallocConnection( size_t size )
{
int32_t freeIndex = -1;
void * pNewConnection = NULL;
/* Check size argument. */
if( size == sizeof( _mqttConnection_t ) )
{
/* Find a free MQTT connection. */
freeIndex = IotStaticMemory_FindFree( _pInUseMqttConnections,
IOT_MQTT_CONNECTIONS );
if( freeIndex != -1 )
{
pNewConnection = &( _pMqttConnections[ freeIndex ] );
}
}
return pNewConnection;
}
/*-----------------------------------------------------------*/
void IotMqtt_FreeConnection( void * ptr )
{
/* Return the in-use MQTT connection. */
IotStaticMemory_ReturnInUse( ptr,
_pMqttConnections,
_pInUseMqttConnections,
IOT_MQTT_CONNECTIONS,
sizeof( _mqttConnection_t ) );
}
/*-----------------------------------------------------------*/
void * IotMqtt_MallocOperation( size_t size )
{
int32_t freeIndex = -1;
void * pNewOperation = NULL;
/* Check size argument. */
if( size == sizeof( _mqttOperation_t ) )
{
/* Find a free MQTT operation. */
freeIndex = IotStaticMemory_FindFree( _pInUseMqttOperations,
IOT_MQTT_MAX_IN_PROGRESS_OPERATIONS );
if( freeIndex != -1 )
{
pNewOperation = &( _pMqttOperations[ freeIndex ] );
}
}
return pNewOperation;
}
/*-----------------------------------------------------------*/
void IotMqtt_FreeOperation( void * ptr )
{
/* Return the in-use MQTT operation. */
IotStaticMemory_ReturnInUse( ptr,
_pMqttOperations,
_pInUseMqttOperations,
IOT_MQTT_MAX_IN_PROGRESS_OPERATIONS,
sizeof( _mqttOperation_t ) );
}
/*-----------------------------------------------------------*/
void * IotMqtt_MallocSubscription( size_t size )
{
int32_t freeIndex = -1;
void * pNewSubscription = NULL;
if( size <= MQTT_SUBSCRIPTION_SIZE )
{
/* Get the index of a free MQTT subscription. */
freeIndex = IotStaticMemory_FindFree( _pInUseMqttSubscriptions,
IOT_MQTT_SUBSCRIPTIONS );
if( freeIndex != -1 )
{
pNewSubscription = &( _pMqttSubscriptions[ freeIndex ][ 0 ] );
}
}
return pNewSubscription;
}
/*-----------------------------------------------------------*/
void IotMqtt_FreeSubscription( void * ptr )
{
/* Return the in-use MQTT subscription. */
IotStaticMemory_ReturnInUse( ptr,
_pMqttSubscriptions,
_pInUseMqttSubscriptions,
IOT_MQTT_SUBSCRIPTIONS,
MQTT_SUBSCRIPTION_SIZE );
}
/*-----------------------------------------------------------*/
#endif
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