mirror of
https://github.com/FreeRTOS/coreMQTT
synced 2025-10-21 06:03:12 +08:00
a4fad60fce
MQTTv5 Library preview Description ----------- - This change adds the client implementation of MQTT version 5 CONNECT, CONNACK, Outgoing PUBLISH, PUBLISH ACKS, Incoming PUBLISH, SUBSCRIBE, SUBACK, UNSUBSCRIBE, UNSUBACK, DISCONNECT. - Existing data structures and functions are modified, and some new functions are added to serialize and deserialize the packets. - Plaintext Demo for reference ( https://github.com/adituc/FreeRTOS/blob/pooja-main-branch/FreeRTOS-Plus/Demo/coreMQTT_Windows_Simulator/MQTTV5_Plain_Text/DemoTasks/PlaintextMQTTExampleV5.c ) Test Steps ----------- - Unit Tests are added for all new and modified features. - Unit Tests for MQTTv5 functions are added in a separate folder in test.
67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
/*
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* coreMQTT <DEVELOPMENT BRANCH>
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* Copyright (C) 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* @file core_mqtt_utils.c
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* @brief Implements the utility functions in core_mqtt_utils.h.
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*/
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#include <string.h>
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#include <assert.h>
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#include <stdint.h>
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/* Include config defaults header to get default values of configs. */
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#include "core_mqtt_config_defaults.h"
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#include "core_mqtt_utils.h"
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uint8_t * encodeVariableLength( uint8_t * pDestination,
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size_t length )
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{
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uint8_t lengthByte;
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uint8_t * pLengthEnd = NULL;
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size_t remainingLength = length;
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assert( pDestination != NULL );
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pLengthEnd = pDestination;
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/* This algorithm is copied from the MQTT 5.0 spec. */
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do
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{
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lengthByte = ( uint8_t ) ( remainingLength % 128U );
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remainingLength = remainingLength / 128U;
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/* Set the high bit of this byte, indicating that there's more data. */
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if( remainingLength > 0U )
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{
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UINT8_SET_BIT( lengthByte, 7 );
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}
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/* Output a single encoded byte. */
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*pLengthEnd = lengthByte;
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pLengthEnd++;
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} while( remainingLength > 0U );
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return pLengthEnd;
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}
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