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/*
* AWS IoT Shadow V2.1.0
* 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.
*/
/**
* @file aws_iot_shadow_static_memory.c
* @brief Implementation of Shadow 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 "iot_static_memory.h"
/* Shadow internal include. */
#include "private/aws_iot_shadow_internal.h"
/*-----------------------------------------------------------*/
/**
* @cond DOXYGEN_IGNORE
* Doxygen should ignore this section.
*
* Provide default values for undefined configuration constants.
*/
#ifndef AWS_IOT_SHADOW_MAX_IN_PROGRESS_OPERATIONS
#define AWS_IOT_SHADOW_MAX_IN_PROGRESS_OPERATIONS ( 10 )
#endif
#ifndef AWS_IOT_SHADOW_SUBSCRIPTIONS
#define AWS_IOT_SHADOW_SUBSCRIPTIONS ( 2 )
#endif
/** @endcond */
/* Validate static memory configuration settings. */
#if AWS_IOT_SHADOW_MAX_IN_PROGRESS_OPERATIONS <= 0
#error "AWS_IOT_SHADOW_MAX_IN_PROGRESS_OPERATIONS cannot be 0 or negative."
#endif
#if AWS_IOT_SHADOW_SUBSCRIPTIONS <= 0
#error "AWS_IOT_SHADOW_SUBSCRIPTIONS cannot be 0 or negative."
#endif
/**
* @brief The size of a static memory Shadow subscription.
*
* Since the pThingName member of #_shadowSubscription_t is variable-length,
* the constant `AWS_IOT_MAX_THING_NAME_LENGTH` is used for the length of
* #_shadowSubscription_t.pThingName.
*/
#define SHADOW_SUBSCRIPTION_SIZE ( sizeof( _shadowSubscription_t ) + AWS_IOT_MAX_THING_NAME_LENGTH )
/*-----------------------------------------------------------*/
/*
* Static memory buffers and flags, allocated and zeroed at compile-time.
*/
static uint32_t _pInUseShadowOperations[ AWS_IOT_SHADOW_MAX_IN_PROGRESS_OPERATIONS ] = { 0U }; /**< @brief Shadow operation in-use flags. */
static _shadowOperation_t _pShadowOperations[ AWS_IOT_SHADOW_MAX_IN_PROGRESS_OPERATIONS ] = { { .link = { 0 } } }; /**< @brief Shadow operations. */
static uint32_t _pInUseShadowSubscriptions[ AWS_IOT_SHADOW_SUBSCRIPTIONS ] = { 0U }; /**< @brief Shadow subscription in-use flags. */
static char _pShadowSubscriptions[ AWS_IOT_SHADOW_SUBSCRIPTIONS ][ SHADOW_SUBSCRIPTION_SIZE ] = { { 0 } }; /**< @brief Shadow subscriptions. */
/*-----------------------------------------------------------*/
void * AwsIotShadow_MallocOperation( size_t size )
{
int32_t freeIndex = -1;
void * pNewOperation = NULL;
/* Check size argument. */
if( size == sizeof( _shadowOperation_t ) )
{
/* Find a free Shadow operation. */
freeIndex = IotStaticMemory_FindFree( _pInUseShadowOperations,
AWS_IOT_SHADOW_MAX_IN_PROGRESS_OPERATIONS );
if( freeIndex != -1 )
{
pNewOperation = &( _pShadowOperations[ freeIndex ] );
}
}
return pNewOperation;
}
/*-----------------------------------------------------------*/
void AwsIotShadow_FreeOperation( void * ptr )
{
/* Return the in-use Shadow operation. */
IotStaticMemory_ReturnInUse( ptr,
_pShadowOperations,
_pInUseShadowOperations,
AWS_IOT_SHADOW_MAX_IN_PROGRESS_OPERATIONS,
sizeof( _shadowOperation_t ) );
}
/*-----------------------------------------------------------*/
void * AwsIotShadow_MallocSubscription( size_t size )
{
int32_t freeIndex = -1;
void * pNewSubscription = NULL;
if( size <= SHADOW_SUBSCRIPTION_SIZE )
{
/* Get the index of a free Shadow subscription. */
freeIndex = IotStaticMemory_FindFree( _pInUseShadowSubscriptions,
AWS_IOT_SHADOW_SUBSCRIPTIONS );
if( freeIndex != -1 )
{
pNewSubscription = &( _pShadowSubscriptions[ freeIndex ][ 0 ] );
}
}
return pNewSubscription;
}
/*-----------------------------------------------------------*/
void AwsIotShadow_FreeSubscription( void * ptr )
{
/* Return the in-use Shadow subscription. */
IotStaticMemory_ReturnInUse( ptr,
_pShadowSubscriptions,
_pInUseShadowSubscriptions,
AWS_IOT_SHADOW_SUBSCRIPTIONS,
SHADOW_SUBSCRIPTION_SIZE );
}
/*-----------------------------------------------------------*/
#endif
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