1 | // Copyright (c) Microsoft. All rights reserved.
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2 | // Licensed under the MIT license. See LICENSE file in the project root for full license information.
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3 |
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4 | #include <stdlib.h>
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5 | #include <limits.h>
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6 | #include "azure_c_shared_utility/optimize_size.h"
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7 | #include "azure_c_shared_utility/gballoc.h"
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8 | #include "azure_c_shared_utility/buffer_.h"
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9 | #include "azure_c_shared_utility/strings.h"
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10 | #include "azure_c_shared_utility/macro_utils.h"
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11 | #include "azure_c_shared_utility/xlogging.h"
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12 | #include "azure_umqtt_c/mqtt_codec.h"
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13 | #include <inttypes.h>
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14 |
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15 | #define PAYLOAD_OFFSET 5
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16 | #define PACKET_TYPE_BYTE(p) (CONTROL_PACKET_TYPE)((uint8_t)(((uint8_t)(p)) & 0xf0))
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17 | #define FLAG_VALUE_BYTE(p) ((uint8_t)(((uint8_t)(p)) & 0xf))
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18 |
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19 | #define USERNAME_FLAG 0x80
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20 | #define PASSWORD_FLAG 0x40
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21 | #define WILL_RETAIN_FLAG 0x20
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22 | #define WILL_QOS_FLAG_ 0x18
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23 | #define WILL_FLAG_FLAG 0x04
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24 | #define CLEAN_SESSION_FLAG 0x02
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25 |
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26 | #define NEXT_128_CHUNK 0x80
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27 | #define PUBLISH_DUP_FLAG 0x8
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28 | #define PUBLISH_QOS_EXACTLY_ONCE 0x4
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29 | #define PUBLISH_QOS_AT_LEAST_ONCE 0x2
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30 | #define PUBLISH_QOS_RETAIN 0x1
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31 |
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32 | #define PROTOCOL_NUMBER 4
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33 | #define CONN_FLAG_BYTE_OFFSET 7
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34 |
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35 | #define CONNECT_FIXED_HEADER_SIZE 2
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36 | #define CONNECT_VARIABLE_HEADER_SIZE 10
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37 | #define SUBSCRIBE_FIXED_HEADER_FLAG 0x2
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38 | #define UNSUBSCRIBE_FIXED_HEADER_FLAG 0x2
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39 |
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40 | #define MAX_SEND_SIZE 0xFFFFFF7F
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41 |
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42 | #define CODEC_STATE_VALUES \
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43 | CODEC_STATE_FIXED_HEADER, \
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44 | CODEC_STATE_VAR_HEADER, \
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45 | CODEC_STATE_PAYLOAD
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46 |
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47 | static const char* const TRUE_CONST = "true";
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48 | static const char* const FALSE_CONST = "false";
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49 |
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50 | MU_DEFINE_ENUM(CODEC_STATE_RESULT, CODEC_STATE_VALUES);
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51 |
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52 | typedef struct MQTTCODEC_INSTANCE_TAG
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53 | {
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54 | CONTROL_PACKET_TYPE currPacket;
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55 | CODEC_STATE_RESULT codecState;
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56 | size_t bufferOffset;
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57 | int headerFlags;
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58 | BUFFER_HANDLE headerData;
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59 | ON_PACKET_COMPLETE_CALLBACK packetComplete;
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60 | void* callContext;
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61 | uint8_t storeRemainLen[4];
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62 | size_t remainLenIndex;
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63 | } MQTTCODEC_INSTANCE;
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64 |
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65 | typedef struct PUBLISH_HEADER_INFO_TAG
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66 | {
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67 | const char* topicName;
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68 | uint16_t packetId;
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69 | const char* msgBuffer;
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70 | QOS_VALUE qualityOfServiceValue;
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71 | } PUBLISH_HEADER_INFO;
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72 |
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73 | static const char* retrieve_qos_value(QOS_VALUE value)
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74 | {
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75 | switch (value)
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76 | {
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77 | case DELIVER_AT_MOST_ONCE:
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78 | return "DELIVER_AT_MOST_ONCE";
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79 | case DELIVER_AT_LEAST_ONCE:
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80 | return "DELIVER_AT_LEAST_ONCE";
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81 | case DELIVER_EXACTLY_ONCE:
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82 | default:
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83 | return "DELIVER_EXACTLY_ONCE";
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84 | }
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85 | }
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86 |
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87 | static void byteutil_writeByte(uint8_t** buffer, uint8_t value)
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88 | {
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89 | if (buffer != NULL)
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90 | {
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91 | **buffer = value;
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92 | (*buffer)++;
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93 | }
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94 | }
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95 |
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96 | static void byteutil_writeInt(uint8_t** buffer, uint16_t value)
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97 | {
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98 | if (buffer != NULL)
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99 | {
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100 | **buffer = (char)(value / 256);
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101 | (*buffer)++;
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102 | **buffer = (char)(value % 256);
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103 | (*buffer)++;
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104 | }
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105 | }
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106 |
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107 | static void byteutil_writeUTF(uint8_t** buffer, const char* stringData, uint16_t len)
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108 | {
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109 | if (buffer != NULL)
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110 | {
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111 | byteutil_writeInt(buffer, len);
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112 | (void)memcpy(*buffer, stringData, len);
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113 | *buffer += len;
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114 | }
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115 | }
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116 |
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117 | static CONTROL_PACKET_TYPE processControlPacketType(uint8_t pktByte, int* flags)
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118 | {
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119 | CONTROL_PACKET_TYPE result;
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120 | result = PACKET_TYPE_BYTE(pktByte);
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121 | if (flags != NULL)
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122 | {
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123 | *flags = FLAG_VALUE_BYTE(pktByte);
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124 | }
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125 | return result;
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126 | }
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127 |
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128 | static int addListItemsToUnsubscribePacket(BUFFER_HANDLE ctrlPacket, const char** payloadList, size_t payloadCount, STRING_HANDLE trace_log)
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129 | {
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130 | int result = 0;
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131 | if (payloadList == NULL || ctrlPacket == NULL)
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132 | {
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133 | result = MU_FAILURE;
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134 | }
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135 | else
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136 | {
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137 | size_t index = 0;
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138 | for (index = 0; index < payloadCount && result == 0; index++)
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139 | {
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140 | // Add the Payload
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141 | size_t offsetLen = BUFFER_length(ctrlPacket);
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142 | size_t topicLen = strlen(payloadList[index]);
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143 | if (topicLen > USHRT_MAX)
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144 | {
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145 | result = MU_FAILURE;
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146 | }
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147 | else if (BUFFER_enlarge(ctrlPacket, topicLen + 2) != 0)
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148 | {
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149 | result = MU_FAILURE;
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150 | }
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151 | else
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152 | {
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153 | uint8_t* iterator = BUFFER_u_char(ctrlPacket);
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154 | iterator += offsetLen;
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155 | byteutil_writeUTF(&iterator, payloadList[index], (uint16_t)topicLen);
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156 | }
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157 | if (trace_log != NULL)
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158 | {
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159 | STRING_sprintf(trace_log, " | TOPIC_NAME: %s", payloadList[index]);
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160 | }
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161 | }
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162 | }
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163 | return result;
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164 | }
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165 |
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166 | static int addListItemsToSubscribePacket(BUFFER_HANDLE ctrlPacket, SUBSCRIBE_PAYLOAD* payloadList, size_t payloadCount, STRING_HANDLE trace_log)
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167 | {
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168 | int result = 0;
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169 | if (payloadList == NULL || ctrlPacket == NULL)
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170 | {
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171 | result = MU_FAILURE;
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172 | }
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173 | else
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174 | {
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175 | size_t index = 0;
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176 | for (index = 0; index < payloadCount && result == 0; index++)
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177 | {
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178 | // Add the Payload
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179 | size_t offsetLen = BUFFER_length(ctrlPacket);
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180 | size_t topicLen = strlen(payloadList[index].subscribeTopic);
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181 | if (topicLen > USHRT_MAX)
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182 | {
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183 | result = MU_FAILURE;
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184 | }
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185 | else if (BUFFER_enlarge(ctrlPacket, topicLen + 2 + 1) != 0)
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186 | {
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187 | result = MU_FAILURE;
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188 | }
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189 | else
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190 | {
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191 | uint8_t* iterator = BUFFER_u_char(ctrlPacket);
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192 | iterator += offsetLen;
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193 | byteutil_writeUTF(&iterator, payloadList[index].subscribeTopic, (uint16_t)topicLen);
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194 | *iterator = payloadList[index].qosReturn;
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195 |
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196 | if (trace_log != NULL)
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197 | {
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198 | STRING_sprintf(trace_log, " | TOPIC_NAME: %s | QOS: %d", payloadList[index].subscribeTopic, (int)payloadList[index].qosReturn);
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199 | }
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200 | }
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201 | }
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202 | }
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203 | return result;
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204 | }
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205 |
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206 | static int constructConnectVariableHeader(BUFFER_HANDLE ctrlPacket, const MQTT_CLIENT_OPTIONS* mqttOptions, STRING_HANDLE trace_log)
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207 | {
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208 | int result = 0;
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209 | if (BUFFER_enlarge(ctrlPacket, CONNECT_VARIABLE_HEADER_SIZE) != 0)
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210 | {
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211 | result = MU_FAILURE;
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212 | }
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213 | else
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214 | {
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215 | uint8_t* iterator = BUFFER_u_char(ctrlPacket);
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216 | if (iterator == NULL)
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217 | {
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218 | result = MU_FAILURE;
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219 | }
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220 | else
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221 | {
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222 | if (trace_log != NULL)
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223 | {
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224 | STRING_sprintf(trace_log, " | VER: %d | KEEPALIVE: %d | FLAGS:", PROTOCOL_NUMBER, mqttOptions->keepAliveInterval);
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225 | }
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226 | byteutil_writeUTF(&iterator, "MQTT", 4);
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227 | byteutil_writeByte(&iterator, PROTOCOL_NUMBER);
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228 | byteutil_writeByte(&iterator, 0); // Flags will be entered later
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229 | byteutil_writeInt(&iterator, mqttOptions->keepAliveInterval);
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230 | result = 0;
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231 | }
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232 | }
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233 | return result;
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234 | }
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235 |
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236 | static int constructPublishVariableHeader(BUFFER_HANDLE ctrlPacket, const PUBLISH_HEADER_INFO* publishHeader, STRING_HANDLE trace_log)
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237 | {
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238 | int result = 0;
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239 | size_t topicLen = 0;
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240 | size_t spaceLen = 0;
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241 | size_t idLen = 0;
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242 |
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243 | size_t currLen = BUFFER_length(ctrlPacket);
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244 |
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245 | topicLen = strlen(publishHeader->topicName);
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246 | spaceLen += 2;
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247 |
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248 | if (publishHeader->qualityOfServiceValue != DELIVER_AT_MOST_ONCE)
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249 | {
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250 | // Packet Id is only set if the QOS is not 0
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251 | idLen = 2;
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252 | }
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253 |
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254 | if (topicLen > USHRT_MAX)
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255 | {
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256 | result = MU_FAILURE;
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257 | }
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258 | else if (BUFFER_enlarge(ctrlPacket, topicLen + idLen + spaceLen) != 0)
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259 | {
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260 | result = MU_FAILURE;
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261 | }
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262 | else
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263 | {
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264 | uint8_t* iterator = BUFFER_u_char(ctrlPacket);
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265 | if (iterator == NULL)
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266 | {
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267 | result = MU_FAILURE;
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268 | }
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269 | else
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270 | {
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271 | iterator += currLen;
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272 | /* The Topic Name MUST be present as the first field in the PUBLISH Packet Variable header.It MUST be 792 a UTF-8 encoded string [MQTT-3.3.2-1] as defined in section 1.5.3.*/
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273 | byteutil_writeUTF(&iterator, publishHeader->topicName, (uint16_t)topicLen);
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274 | if (trace_log != NULL)
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275 | {
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276 | STRING_sprintf(trace_log, " | TOPIC_NAME: %s", publishHeader->topicName);
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277 | }
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278 | if (idLen > 0)
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279 | {
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280 | if (trace_log != NULL)
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281 | {
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282 | STRING_sprintf(trace_log, " | PACKET_ID: %"PRIu16, publishHeader->packetId);
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283 | }
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284 | byteutil_writeInt(&iterator, publishHeader->packetId);
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285 | }
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286 | result = 0;
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287 | }
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288 | }
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289 | return result;
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290 | }
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291 |
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292 | static int constructSubscibeTypeVariableHeader(BUFFER_HANDLE ctrlPacket, uint16_t packetId)
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293 | {
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294 | int result = 0;
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295 | if (BUFFER_enlarge(ctrlPacket, 2) != 0)
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296 | {
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297 | result = MU_FAILURE;
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298 | }
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299 | else
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300 | {
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301 | uint8_t* iterator = BUFFER_u_char(ctrlPacket);
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302 | if (iterator == NULL)
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303 | {
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304 | result = MU_FAILURE;
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305 | }
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306 | else
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307 | {
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308 | byteutil_writeInt(&iterator, packetId);
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309 | result = 0;
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310 | }
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311 | }
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312 | return result;
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313 | }
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314 |
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315 | static BUFFER_HANDLE constructPublishReply(CONTROL_PACKET_TYPE type, uint8_t flags, uint16_t packetId)
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316 | {
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317 | BUFFER_HANDLE result = BUFFER_new();
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318 | if (result != NULL)
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319 | {
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320 | if (BUFFER_pre_build(result, 4) != 0)
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321 | {
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322 | BUFFER_delete(result);
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323 | result = NULL;
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324 | }
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325 | else
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326 | {
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327 | uint8_t* iterator = BUFFER_u_char(result);
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328 | if (iterator == NULL)
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329 | {
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330 | BUFFER_delete(result);
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331 | result = NULL;
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332 | }
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333 | else
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334 | {
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335 | *iterator = (uint8_t)type | flags;
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336 | iterator++;
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337 | *iterator = 0x2;
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338 | iterator++;
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339 | byteutil_writeInt(&iterator, packetId);
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340 | }
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341 | }
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342 | }
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343 | return result;
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344 | }
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345 |
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346 | static int constructFixedHeader(BUFFER_HANDLE ctrlPacket, CONTROL_PACKET_TYPE packetType, uint8_t flags)
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347 | {
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348 | int result;
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349 | if (ctrlPacket == NULL)
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350 | {
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351 | return MU_FAILURE;
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352 | }
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353 | else
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354 | {
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355 | size_t packetLen = BUFFER_length(ctrlPacket);
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356 | uint8_t remainSize[4] ={ 0 };
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357 | size_t index = 0;
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358 |
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359 | // Calculate the length of packet
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360 | do
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361 | {
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362 | uint8_t encode = packetLen % 128;
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363 | packetLen /= 128;
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364 | // if there are more data to encode, set the top bit of this byte
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365 | if (packetLen > 0)
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366 | {
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367 | encode |= NEXT_128_CHUNK;
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368 | }
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369 | remainSize[index++] = encode;
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370 | } while (packetLen > 0);
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371 |
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372 | BUFFER_HANDLE fixedHeader = BUFFER_new();
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373 | if (fixedHeader == NULL)
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374 | {
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375 | result = MU_FAILURE;
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376 | }
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377 | else if (BUFFER_pre_build(fixedHeader, index + 1) != 0)
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378 | {
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379 | BUFFER_delete(fixedHeader);
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380 | result = MU_FAILURE;
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381 | }
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382 | else
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383 | {
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384 | uint8_t* iterator = BUFFER_u_char(fixedHeader);
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385 | *iterator = (uint8_t)packetType | flags;
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386 | iterator++;
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387 | (void)memcpy(iterator, remainSize, index);
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388 |
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389 | result = BUFFER_prepend(ctrlPacket, fixedHeader);
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390 | BUFFER_delete(fixedHeader);
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391 | }
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392 | }
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393 | return result;
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394 | }
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395 |
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396 | static int constructConnPayload(BUFFER_HANDLE ctrlPacket, const MQTT_CLIENT_OPTIONS* mqttOptions, STRING_HANDLE trace_log)
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397 | {
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398 | int result = 0;
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399 | if (mqttOptions == NULL || ctrlPacket == NULL)
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400 | {
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401 | result = MU_FAILURE;
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402 | }
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403 | else
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404 | {
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405 | size_t clientLen = 0;
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406 | size_t usernameLen = 0;
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407 | size_t passwordLen = 0;
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408 | size_t willMessageLen = 0;
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409 | size_t willTopicLen = 0;
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410 | size_t spaceLen = 0;
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411 |
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412 | if (mqttOptions->clientId != NULL)
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413 | {
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414 | spaceLen += 2;
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415 | clientLen = strlen(mqttOptions->clientId);
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416 | }
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417 | if (mqttOptions->username != NULL)
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418 | {
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419 | spaceLen += 2;
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420 | usernameLen = strlen(mqttOptions->username);
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421 | }
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422 | if (mqttOptions->password != NULL)
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423 | {
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424 | spaceLen += 2;
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425 | passwordLen = strlen(mqttOptions->password);
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426 | }
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427 | if (mqttOptions->willMessage != NULL)
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428 | {
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429 | spaceLen += 2;
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430 | willMessageLen = strlen(mqttOptions->willMessage);
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431 | }
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432 | if (mqttOptions->willTopic != NULL)
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433 | {
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434 | spaceLen += 2;
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435 | willTopicLen = strlen(mqttOptions->willTopic);
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436 | }
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437 |
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438 | size_t currLen = BUFFER_length(ctrlPacket);
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439 | size_t totalLen = clientLen + usernameLen + passwordLen + willMessageLen + willTopicLen + spaceLen;
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440 |
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441 | // Validate the Username & Password
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442 | if (clientLen > USHRT_MAX)
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443 | {
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444 | result = MU_FAILURE;
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445 | }
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446 | else if (usernameLen == 0 && passwordLen > 0)
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447 | {
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448 | result = MU_FAILURE;
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449 | }
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450 | else if ((willMessageLen > 0 && willTopicLen == 0) || (willTopicLen > 0 && willMessageLen == 0))
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451 | {
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452 | result = MU_FAILURE;
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453 | }
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454 | else if (BUFFER_enlarge(ctrlPacket, totalLen) != 0)
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455 | {
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456 | result = MU_FAILURE;
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457 | }
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458 | else
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459 | {
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460 | uint8_t* packet = BUFFER_u_char(ctrlPacket);
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461 | uint8_t* iterator = packet;
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462 |
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463 | iterator += currLen;
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464 | byteutil_writeUTF(&iterator, mqttOptions->clientId, (uint16_t)clientLen);
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465 |
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466 | // TODO: Read on the Will Topic
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467 | if (willMessageLen > USHRT_MAX || willTopicLen > USHRT_MAX || usernameLen > USHRT_MAX || passwordLen > USHRT_MAX)
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468 | {
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469 | result = MU_FAILURE;
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470 | }
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471 | else
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472 | {
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473 | STRING_HANDLE connect_payload_trace = NULL;
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474 | if (trace_log != NULL)
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475 | {
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476 | connect_payload_trace = STRING_new();
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477 | }
|
---|
478 | if (willMessageLen > 0 && willTopicLen > 0)
|
---|
479 | {
|
---|
480 | if (trace_log != NULL)
|
---|
481 | {
|
---|
482 | (void)STRING_sprintf(connect_payload_trace, " | WILL_TOPIC: %s", mqttOptions->willTopic);
|
---|
483 | }
|
---|
484 | packet[CONN_FLAG_BYTE_OFFSET] |= WILL_FLAG_FLAG;
|
---|
485 | byteutil_writeUTF(&iterator, mqttOptions->willTopic, (uint16_t)willTopicLen);
|
---|
486 | packet[CONN_FLAG_BYTE_OFFSET] |= (mqttOptions->qualityOfServiceValue << 3);
|
---|
487 | if (mqttOptions->messageRetain)
|
---|
488 | {
|
---|
489 | packet[CONN_FLAG_BYTE_OFFSET] |= WILL_RETAIN_FLAG;
|
---|
490 | }
|
---|
491 | byteutil_writeUTF(&iterator, mqttOptions->willMessage, (uint16_t)willMessageLen);
|
---|
492 | }
|
---|
493 | if (usernameLen > 0)
|
---|
494 | {
|
---|
495 | packet[CONN_FLAG_BYTE_OFFSET] |= USERNAME_FLAG;
|
---|
496 | byteutil_writeUTF(&iterator, mqttOptions->username, (uint16_t)usernameLen);
|
---|
497 | if (trace_log != NULL)
|
---|
498 | {
|
---|
499 | (void)STRING_sprintf(connect_payload_trace, " | USERNAME: %s", mqttOptions->username);
|
---|
500 | }
|
---|
501 | }
|
---|
502 | if (passwordLen > 0)
|
---|
503 | {
|
---|
504 | packet[CONN_FLAG_BYTE_OFFSET] |= PASSWORD_FLAG;
|
---|
505 | byteutil_writeUTF(&iterator, mqttOptions->password, (uint16_t)passwordLen);
|
---|
506 | if (trace_log != NULL)
|
---|
507 | {
|
---|
508 | (void)STRING_sprintf(connect_payload_trace, " | PWD: XXXX");
|
---|
509 | }
|
---|
510 | }
|
---|
511 | // TODO: Get the rest of the flags
|
---|
512 | if (trace_log != NULL)
|
---|
513 | {
|
---|
514 | (void)STRING_sprintf(connect_payload_trace, " | CLEAN: %s", mqttOptions->useCleanSession ? "1" : "0");
|
---|
515 | }
|
---|
516 | if (mqttOptions->useCleanSession)
|
---|
517 | {
|
---|
518 | packet[CONN_FLAG_BYTE_OFFSET] |= CLEAN_SESSION_FLAG;
|
---|
519 | }
|
---|
520 | if (trace_log != NULL)
|
---|
521 | {
|
---|
522 | (void)STRING_sprintf(trace_log, " %lu", packet[CONN_FLAG_BYTE_OFFSET]);
|
---|
523 | (void)STRING_concat_with_STRING(trace_log, connect_payload_trace);
|
---|
524 | STRING_delete(connect_payload_trace);
|
---|
525 | }
|
---|
526 | result = 0;
|
---|
527 | }
|
---|
528 | }
|
---|
529 | }
|
---|
530 | return result;
|
---|
531 | }
|
---|
532 |
|
---|
533 | static int prepareheaderDataInfo(MQTTCODEC_INSTANCE* codecData, uint8_t remainLen)
|
---|
534 | {
|
---|
535 | int result;
|
---|
536 | if (codecData == NULL)
|
---|
537 | {
|
---|
538 | result = MU_FAILURE;
|
---|
539 | }
|
---|
540 | else
|
---|
541 | {
|
---|
542 | result = 0;
|
---|
543 | codecData->storeRemainLen[codecData->remainLenIndex++] = remainLen;
|
---|
544 | if (remainLen <= 0x7f)
|
---|
545 | {
|
---|
546 | int multiplier = 1;
|
---|
547 | int totalLen = 0;
|
---|
548 | size_t index = 0;
|
---|
549 | uint8_t encodeByte = 0;
|
---|
550 | do
|
---|
551 | {
|
---|
552 | encodeByte = codecData->storeRemainLen[index++];
|
---|
553 | totalLen += (encodeByte & 127) * multiplier;
|
---|
554 | multiplier *= NEXT_128_CHUNK;
|
---|
555 |
|
---|
556 | if (multiplier > 128 * 128 * 128)
|
---|
557 | {
|
---|
558 | result = MU_FAILURE;
|
---|
559 | break;
|
---|
560 | }
|
---|
561 | } while ((encodeByte & NEXT_128_CHUNK) != 0);
|
---|
562 |
|
---|
563 | codecData->codecState = CODEC_STATE_VAR_HEADER;
|
---|
564 |
|
---|
565 | // Reset remainLen Index
|
---|
566 | codecData->remainLenIndex = 0;
|
---|
567 | memset(codecData->storeRemainLen, 0, 4 * sizeof(uint8_t));
|
---|
568 |
|
---|
569 | if (totalLen > 0)
|
---|
570 | {
|
---|
571 | codecData->bufferOffset = 0;
|
---|
572 | codecData->headerData = BUFFER_new();
|
---|
573 | if (codecData->headerData == NULL)
|
---|
574 | {
|
---|
575 | /* Codes_SRS_MQTT_CODEC_07_035: [ If any error is encountered then the packet state will be marked as error and mqtt_codec_bytesReceived shall return a non-zero value. ] */
|
---|
576 | LogError("Failed BUFFER_new");
|
---|
577 | result = MU_FAILURE;
|
---|
578 | }
|
---|
579 | else
|
---|
580 | {
|
---|
581 | if (BUFFER_pre_build(codecData->headerData, totalLen) != 0)
|
---|
582 | {
|
---|
583 | /* Codes_SRS_MQTT_CODEC_07_035: [ If any error is encountered then the packet state will be marked as error and mqtt_codec_bytesReceived shall return a non-zero value. ] */
|
---|
584 | LogError("Failed BUFFER_pre_build");
|
---|
585 | result = MU_FAILURE;
|
---|
586 | }
|
---|
587 |
|
---|
588 | }
|
---|
589 | }
|
---|
590 | }
|
---|
591 | }
|
---|
592 | return result;
|
---|
593 | }
|
---|
594 |
|
---|
595 | static void completePacketData(MQTTCODEC_INSTANCE* codecData)
|
---|
596 | {
|
---|
597 | if (codecData)
|
---|
598 | {
|
---|
599 | if (codecData->packetComplete != NULL)
|
---|
600 | {
|
---|
601 | codecData->packetComplete(codecData->callContext, codecData->currPacket, codecData->headerFlags, codecData->headerData);
|
---|
602 | }
|
---|
603 |
|
---|
604 | // Clean up data
|
---|
605 | codecData->currPacket = UNKNOWN_TYPE;
|
---|
606 | codecData->codecState = CODEC_STATE_FIXED_HEADER;
|
---|
607 | codecData->headerFlags = 0;
|
---|
608 | BUFFER_delete(codecData->headerData);
|
---|
609 | codecData->headerData = NULL;
|
---|
610 | }
|
---|
611 | }
|
---|
612 |
|
---|
613 | MQTTCODEC_HANDLE mqtt_codec_create(ON_PACKET_COMPLETE_CALLBACK packetComplete, void* callbackCtx)
|
---|
614 | {
|
---|
615 | MQTTCODEC_HANDLE result;
|
---|
616 | result = malloc(sizeof(MQTTCODEC_INSTANCE));
|
---|
617 | /* Codes_SRS_MQTT_CODEC_07_001: [If a failure is encountered then mqtt_codec_create shall return NULL.] */
|
---|
618 | if (result != NULL)
|
---|
619 | {
|
---|
620 | /* Codes_SRS_MQTT_CODEC_07_002: [On success mqtt_codec_create shall return a MQTTCODEC_HANDLE value.] */
|
---|
621 | result->currPacket = UNKNOWN_TYPE;
|
---|
622 | result->codecState = CODEC_STATE_FIXED_HEADER;
|
---|
623 | result->headerFlags = 0;
|
---|
624 | result->bufferOffset = 0;
|
---|
625 | result->packetComplete = packetComplete;
|
---|
626 | result->callContext = callbackCtx;
|
---|
627 | result->headerData = NULL;
|
---|
628 | memset(result->storeRemainLen, 0, 4 * sizeof(uint8_t));
|
---|
629 | result->remainLenIndex = 0;
|
---|
630 | }
|
---|
631 | return result;
|
---|
632 | }
|
---|
633 |
|
---|
634 | void mqtt_codec_destroy(MQTTCODEC_HANDLE handle)
|
---|
635 | {
|
---|
636 | /* Codes_SRS_MQTT_CODEC_07_003: [If the handle parameter is NULL then mqtt_codec_destroy shall do nothing.] */
|
---|
637 | if (handle != NULL)
|
---|
638 | {
|
---|
639 | MQTTCODEC_INSTANCE* codecData = (MQTTCODEC_INSTANCE*)handle;
|
---|
640 | /* Codes_SRS_MQTT_CODEC_07_004: [mqtt_codec_destroy shall deallocate all memory that has been allocated by this object.] */
|
---|
641 | BUFFER_delete(codecData->headerData);
|
---|
642 | free(codecData);
|
---|
643 | }
|
---|
644 | }
|
---|
645 |
|
---|
646 | BUFFER_HANDLE mqtt_codec_connect(const MQTT_CLIENT_OPTIONS* mqttOptions, STRING_HANDLE trace_log)
|
---|
647 | {
|
---|
648 | BUFFER_HANDLE result;
|
---|
649 | /* Codes_SRS_MQTT_CODEC_07_008: [If the parameters mqttOptions is NULL then mqtt_codec_connect shall return a null value.] */
|
---|
650 | if (mqttOptions == NULL)
|
---|
651 | {
|
---|
652 | result = NULL;
|
---|
653 | }
|
---|
654 | else
|
---|
655 | {
|
---|
656 | /* Codes_SRS_MQTT_CODEC_07_009: [mqtt_codec_connect shall construct a BUFFER_HANDLE that represents a MQTT CONNECT packet.] */
|
---|
657 | result = BUFFER_new();
|
---|
658 | if (result != NULL)
|
---|
659 | {
|
---|
660 | STRING_HANDLE varible_header_log = NULL;
|
---|
661 | if (trace_log != NULL)
|
---|
662 | {
|
---|
663 | varible_header_log = STRING_new();
|
---|
664 | }
|
---|
665 | // Add Variable Header Information
|
---|
666 | if (constructConnectVariableHeader(result, mqttOptions, varible_header_log) != 0)
|
---|
667 | {
|
---|
668 | /* Codes_SRS_MQTT_CODEC_07_010: [If any error is encountered then mqtt_codec_connect shall return NULL.] */
|
---|
669 | BUFFER_delete(result);
|
---|
670 | result = NULL;
|
---|
671 | }
|
---|
672 | else
|
---|
673 | {
|
---|
674 | if (constructConnPayload(result, mqttOptions, varible_header_log) != 0)
|
---|
675 | {
|
---|
676 | /* Codes_SRS_MQTT_CODEC_07_010: [If any error is encountered then mqtt_codec_connect shall return NULL.] */
|
---|
677 | BUFFER_delete(result);
|
---|
678 | result = NULL;
|
---|
679 | }
|
---|
680 | else
|
---|
681 | {
|
---|
682 | if (trace_log != NULL)
|
---|
683 | {
|
---|
684 | (void)STRING_copy(trace_log, "CONNECT");
|
---|
685 | }
|
---|
686 | if (constructFixedHeader(result, CONNECT_TYPE, 0) != 0)
|
---|
687 | {
|
---|
688 | /* Codes_SRS_MQTT_CODEC_07_010: [If any error is encountered then mqtt_codec_connect shall return NULL.] */
|
---|
689 | BUFFER_delete(result);
|
---|
690 | result = NULL;
|
---|
691 | }
|
---|
692 | else
|
---|
693 | {
|
---|
694 | if (trace_log != NULL)
|
---|
695 | {
|
---|
696 | (void)STRING_concat_with_STRING(trace_log, varible_header_log);
|
---|
697 | }
|
---|
698 | }
|
---|
699 | }
|
---|
700 | if (varible_header_log != NULL)
|
---|
701 | {
|
---|
702 | STRING_delete(varible_header_log);
|
---|
703 | }
|
---|
704 | }
|
---|
705 | }
|
---|
706 | }
|
---|
707 | return result;
|
---|
708 | }
|
---|
709 |
|
---|
710 | BUFFER_HANDLE mqtt_codec_disconnect()
|
---|
711 | {
|
---|
712 | /* Codes_SRS_MQTT_CODEC_07_011: [On success mqtt_codec_disconnect shall construct a BUFFER_HANDLE that represents a MQTT DISCONNECT packet.] */
|
---|
713 | BUFFER_HANDLE result = BUFFER_new();
|
---|
714 | if (result != NULL)
|
---|
715 | {
|
---|
716 | if (BUFFER_enlarge(result, 2) != 0)
|
---|
717 | {
|
---|
718 | /* Codes_SRS_MQTT_CODEC_07_012: [If any error is encountered mqtt_codec_disconnect shall return NULL.] */
|
---|
719 | BUFFER_delete(result);
|
---|
720 | result = NULL;
|
---|
721 | }
|
---|
722 | else
|
---|
723 | {
|
---|
724 | uint8_t* iterator = BUFFER_u_char(result);
|
---|
725 | if (iterator == NULL)
|
---|
726 | {
|
---|
727 | /* Codes_SRS_MQTT_CODEC_07_012: [If any error is encountered mqtt_codec_disconnect shall return NULL.] */
|
---|
728 | BUFFER_delete(result);
|
---|
729 | result = NULL;
|
---|
730 | }
|
---|
731 | else
|
---|
732 | {
|
---|
733 | iterator[0] = DISCONNECT_TYPE;
|
---|
734 | iterator[1] = 0;
|
---|
735 | }
|
---|
736 | }
|
---|
737 | }
|
---|
738 | return result;
|
---|
739 | }
|
---|
740 |
|
---|
741 | BUFFER_HANDLE mqtt_codec_publish(QOS_VALUE qosValue, bool duplicateMsg, bool serverRetain, uint16_t packetId, const char* topicName, const uint8_t* msgBuffer, size_t buffLen, STRING_HANDLE trace_log)
|
---|
742 | {
|
---|
743 | BUFFER_HANDLE result;
|
---|
744 | /* Codes_SRS_MQTT_CODEC_07_005: [If the parameters topicName is NULL then mqtt_codec_publish shall return NULL.] */
|
---|
745 | if (topicName == NULL)
|
---|
746 | {
|
---|
747 | result = NULL;
|
---|
748 | }
|
---|
749 | /* Codes_SRS_MQTT_CODEC_07_036: [mqtt_codec_publish shall return NULL if the buffLen variable is greater than the MAX_SEND_SIZE (0xFFFFFF7F).] */
|
---|
750 | else if (buffLen > MAX_SEND_SIZE)
|
---|
751 | {
|
---|
752 | /* Codes_SRS_MQTT_CODEC_07_006: [If any error is encountered then mqtt_codec_publish shall return NULL.] */
|
---|
753 | result = NULL;
|
---|
754 | }
|
---|
755 | else
|
---|
756 | {
|
---|
757 | PUBLISH_HEADER_INFO publishInfo ={ 0 };
|
---|
758 | publishInfo.topicName = topicName;
|
---|
759 | publishInfo.packetId = packetId;
|
---|
760 | publishInfo.qualityOfServiceValue = qosValue;
|
---|
761 |
|
---|
762 | uint8_t headerFlags = 0;
|
---|
763 | if (duplicateMsg) headerFlags |= PUBLISH_DUP_FLAG;
|
---|
764 | if (serverRetain) headerFlags |= PUBLISH_QOS_RETAIN;
|
---|
765 | if (qosValue != DELIVER_AT_MOST_ONCE)
|
---|
766 | {
|
---|
767 | if (qosValue == DELIVER_AT_LEAST_ONCE)
|
---|
768 | {
|
---|
769 | headerFlags |= PUBLISH_QOS_AT_LEAST_ONCE;
|
---|
770 | }
|
---|
771 | else
|
---|
772 | {
|
---|
773 | headerFlags |= PUBLISH_QOS_EXACTLY_ONCE;
|
---|
774 | }
|
---|
775 | }
|
---|
776 |
|
---|
777 | /* Codes_SRS_MQTT_CODEC_07_007: [mqtt_codec_publish shall return a BUFFER_HANDLE that represents a MQTT PUBLISH message.] */
|
---|
778 | result = BUFFER_new();
|
---|
779 | if (result != NULL)
|
---|
780 | {
|
---|
781 | STRING_HANDLE varible_header_log = NULL;
|
---|
782 | if (trace_log != NULL)
|
---|
783 | {
|
---|
784 | varible_header_log = STRING_construct_sprintf(" | IS_DUP: %s | RETAIN: %d | QOS: %s", duplicateMsg ? TRUE_CONST : FALSE_CONST,
|
---|
785 | serverRetain ? 1 : 0,
|
---|
786 | retrieve_qos_value(publishInfo.qualityOfServiceValue) );
|
---|
787 | }
|
---|
788 |
|
---|
789 | if (constructPublishVariableHeader(result, &publishInfo, varible_header_log) != 0)
|
---|
790 | {
|
---|
791 | /* Codes_SRS_MQTT_CODEC_07_006: [If any error is encountered then mqtt_codec_publish shall return NULL.] */
|
---|
792 | BUFFER_delete(result);
|
---|
793 | result = NULL;
|
---|
794 | }
|
---|
795 | else
|
---|
796 | {
|
---|
797 | size_t payloadOffset = BUFFER_length(result);
|
---|
798 | if (buffLen > 0)
|
---|
799 | {
|
---|
800 | if (BUFFER_enlarge(result, buffLen) != 0)
|
---|
801 | {
|
---|
802 | /* Codes_SRS_MQTT_CODEC_07_006: [If any error is encountered then mqtt_codec_publish shall return NULL.] */
|
---|
803 | BUFFER_delete(result);
|
---|
804 | result = NULL;
|
---|
805 | }
|
---|
806 | else
|
---|
807 | {
|
---|
808 | uint8_t* iterator = BUFFER_u_char(result);
|
---|
809 | if (iterator == NULL)
|
---|
810 | {
|
---|
811 | /* Codes_SRS_MQTT_CODEC_07_006: [If any error is encountered then mqtt_codec_publish shall return NULL.] */
|
---|
812 | BUFFER_delete(result);
|
---|
813 | result = NULL;
|
---|
814 | }
|
---|
815 | else
|
---|
816 | {
|
---|
817 | iterator += payloadOffset;
|
---|
818 | // Write Message
|
---|
819 | (void)memcpy(iterator, msgBuffer, buffLen);
|
---|
820 | if (trace_log)
|
---|
821 | {
|
---|
822 | STRING_sprintf(varible_header_log, " | PAYLOAD_LEN: %lu", (unsigned long)buffLen);
|
---|
823 | }
|
---|
824 | }
|
---|
825 | }
|
---|
826 | }
|
---|
827 |
|
---|
828 | if (result != NULL)
|
---|
829 | {
|
---|
830 | if (trace_log != NULL)
|
---|
831 | {
|
---|
832 | (void)STRING_copy(trace_log, "PUBLISH");
|
---|
833 | }
|
---|
834 | if (constructFixedHeader(result, PUBLISH_TYPE, headerFlags) != 0)
|
---|
835 | {
|
---|
836 | /* Codes_SRS_MQTT_CODEC_07_006: [If any error is encountered then mqtt_codec_publish shall return NULL.] */
|
---|
837 | BUFFER_delete(result);
|
---|
838 | result = NULL;
|
---|
839 | }
|
---|
840 | else
|
---|
841 | {
|
---|
842 | if (trace_log != NULL)
|
---|
843 | {
|
---|
844 | (void)STRING_concat_with_STRING(trace_log, varible_header_log);
|
---|
845 | }
|
---|
846 | }
|
---|
847 | }
|
---|
848 | }
|
---|
849 | if (varible_header_log != NULL)
|
---|
850 | {
|
---|
851 | STRING_delete(varible_header_log);
|
---|
852 | }
|
---|
853 | }
|
---|
854 | }
|
---|
855 | return result;
|
---|
856 | }
|
---|
857 |
|
---|
858 | BUFFER_HANDLE mqtt_codec_publishAck(uint16_t packetId)
|
---|
859 | {
|
---|
860 | /* Codes_SRS_MQTT_CODEC_07_013: [On success mqtt_codec_publishAck shall return a BUFFER_HANDLE representation of a MQTT PUBACK packet.] */
|
---|
861 | /* Codes_SRS_MQTT_CODEC_07_014 : [If any error is encountered then mqtt_codec_publishAck shall return NULL.] */
|
---|
862 | BUFFER_HANDLE result = constructPublishReply(PUBACK_TYPE, 0, packetId);
|
---|
863 | return result;
|
---|
864 | }
|
---|
865 |
|
---|
866 | BUFFER_HANDLE mqtt_codec_publishReceived(uint16_t packetId)
|
---|
867 | {
|
---|
868 | /* Codes_SRS_MQTT_CODEC_07_015: [On success mqtt_codec_publishRecieved shall return a BUFFER_HANDLE representation of a MQTT PUBREC packet.] */
|
---|
869 | /* Codes_SRS_MQTT_CODEC_07_016 : [If any error is encountered then mqtt_codec_publishRecieved shall return NULL.] */
|
---|
870 | BUFFER_HANDLE result = constructPublishReply(PUBREC_TYPE, 0, packetId);
|
---|
871 | return result;
|
---|
872 | }
|
---|
873 |
|
---|
874 | BUFFER_HANDLE mqtt_codec_publishRelease(uint16_t packetId)
|
---|
875 | {
|
---|
876 | /* Codes_SRS_MQTT_CODEC_07_017: [On success mqtt_codec_publishRelease shall return a BUFFER_HANDLE representation of a MQTT PUBREL packet.] */
|
---|
877 | /* Codes_SRS_MQTT_CODEC_07_018 : [If any error is encountered then mqtt_codec_publishRelease shall return NULL.] */
|
---|
878 | BUFFER_HANDLE result = constructPublishReply(PUBREL_TYPE, 2, packetId);
|
---|
879 | return result;
|
---|
880 | }
|
---|
881 |
|
---|
882 | BUFFER_HANDLE mqtt_codec_publishComplete(uint16_t packetId)
|
---|
883 | {
|
---|
884 | /* Codes_SRS_MQTT_CODEC_07_019: [On success mqtt_codec_publishComplete shall return a BUFFER_HANDLE representation of a MQTT PUBCOMP packet.] */
|
---|
885 | /* Codes_SRS_MQTT_CODEC_07_020 : [If any error is encountered then mqtt_codec_publishComplete shall return NULL.] */
|
---|
886 | BUFFER_HANDLE result = constructPublishReply(PUBCOMP_TYPE, 0, packetId);
|
---|
887 | return result;
|
---|
888 | }
|
---|
889 |
|
---|
890 | BUFFER_HANDLE mqtt_codec_ping()
|
---|
891 | {
|
---|
892 | /* Codes_SRS_MQTT_CODEC_07_021: [On success mqtt_codec_ping shall construct a BUFFER_HANDLE that represents a MQTT PINGREQ packet.] */
|
---|
893 | BUFFER_HANDLE result = BUFFER_new();
|
---|
894 | if (result != NULL)
|
---|
895 | {
|
---|
896 | if (BUFFER_enlarge(result, 2) != 0)
|
---|
897 | {
|
---|
898 | /* Codes_SRS_MQTT_CODEC_07_022: [If any error is encountered mqtt_codec_ping shall return NULL.] */
|
---|
899 | BUFFER_delete(result);
|
---|
900 | result = NULL;
|
---|
901 | }
|
---|
902 | else
|
---|
903 | {
|
---|
904 | uint8_t* iterator = BUFFER_u_char(result);
|
---|
905 | if (iterator == NULL)
|
---|
906 | {
|
---|
907 | /* Codes_SRS_MQTT_CODEC_07_022: [If any error is encountered mqtt_codec_ping shall return NULL.] */
|
---|
908 | BUFFER_delete(result);
|
---|
909 | result = NULL;
|
---|
910 | }
|
---|
911 | else
|
---|
912 | {
|
---|
913 | iterator[0] = PINGREQ_TYPE;
|
---|
914 | iterator[1] = 0;
|
---|
915 | }
|
---|
916 | }
|
---|
917 | }
|
---|
918 | return result;
|
---|
919 | }
|
---|
920 |
|
---|
921 | BUFFER_HANDLE mqtt_codec_subscribe(uint16_t packetId, SUBSCRIBE_PAYLOAD* subscribeList, size_t count, STRING_HANDLE trace_log)
|
---|
922 | {
|
---|
923 | BUFFER_HANDLE result;
|
---|
924 | /* Codes_SRS_MQTT_CODEC_07_023: [If the parameters subscribeList is NULL or if count is 0 then mqtt_codec_subscribe shall return NULL.] */
|
---|
925 | if (subscribeList == NULL || count == 0)
|
---|
926 | {
|
---|
927 | result = NULL;
|
---|
928 | }
|
---|
929 | else
|
---|
930 | {
|
---|
931 | /* Codes_SRS_MQTT_CODEC_07_026: [mqtt_codec_subscribe shall return a BUFFER_HANDLE that represents a MQTT SUBSCRIBE message.]*/
|
---|
932 | result = BUFFER_new();
|
---|
933 | if (result != NULL)
|
---|
934 | {
|
---|
935 | if (constructSubscibeTypeVariableHeader(result, packetId) != 0)
|
---|
936 | {
|
---|
937 | /* Codes_SRS_MQTT_CODEC_07_025: [If any error is encountered then mqtt_codec_subscribe shall return NULL.] */
|
---|
938 | BUFFER_delete(result);
|
---|
939 | result = NULL;
|
---|
940 | }
|
---|
941 | else
|
---|
942 | {
|
---|
943 | STRING_HANDLE sub_trace = NULL;
|
---|
944 | if (trace_log != NULL)
|
---|
945 | {
|
---|
946 | sub_trace = STRING_construct_sprintf(" | PACKET_ID: %"PRIu16, packetId);
|
---|
947 | }
|
---|
948 | /* Codes_SRS_MQTT_CODEC_07_024: [mqtt_codec_subscribe shall iterate through count items in the subscribeList.] */
|
---|
949 | if (addListItemsToSubscribePacket(result, subscribeList, count, sub_trace) != 0)
|
---|
950 | {
|
---|
951 | /* Codes_SRS_MQTT_CODEC_07_025: [If any error is encountered then mqtt_codec_subscribe shall return NULL.] */
|
---|
952 | BUFFER_delete(result);
|
---|
953 | result = NULL;
|
---|
954 | }
|
---|
955 | else
|
---|
956 | {
|
---|
957 |
|
---|
958 | if (trace_log != NULL)
|
---|
959 | {
|
---|
960 | STRING_concat(trace_log, "SUBSCRIBE");
|
---|
961 | }
|
---|
962 | if (constructFixedHeader(result, SUBSCRIBE_TYPE, SUBSCRIBE_FIXED_HEADER_FLAG) != 0)
|
---|
963 | {
|
---|
964 | /* Codes_SRS_MQTT_CODEC_07_025: [If any error is encountered then mqtt_codec_subscribe shall return NULL.] */
|
---|
965 | BUFFER_delete(result);
|
---|
966 | result = NULL;
|
---|
967 | }
|
---|
968 | else
|
---|
969 | {
|
---|
970 | if (trace_log != NULL)
|
---|
971 | {
|
---|
972 | (void)STRING_concat_with_STRING(trace_log, sub_trace);
|
---|
973 | }
|
---|
974 | }
|
---|
975 | }
|
---|
976 | if (sub_trace != NULL)
|
---|
977 | {
|
---|
978 | STRING_delete(sub_trace);
|
---|
979 | }
|
---|
980 | }
|
---|
981 | }
|
---|
982 | }
|
---|
983 | return result;
|
---|
984 | }
|
---|
985 |
|
---|
986 | BUFFER_HANDLE mqtt_codec_unsubscribe(uint16_t packetId, const char** unsubscribeList, size_t count, STRING_HANDLE trace_log)
|
---|
987 | {
|
---|
988 | BUFFER_HANDLE result;
|
---|
989 | /* Codes_SRS_MQTT_CODEC_07_027: [If the parameters unsubscribeList is NULL or if count is 0 then mqtt_codec_unsubscribe shall return NULL.] */
|
---|
990 | if (unsubscribeList == NULL || count == 0)
|
---|
991 | {
|
---|
992 | result = NULL;
|
---|
993 | }
|
---|
994 | else
|
---|
995 | {
|
---|
996 | /* Codes_SRS_MQTT_CODEC_07_030: [mqtt_codec_unsubscribe shall return a BUFFER_HANDLE that represents a MQTT SUBSCRIBE message.] */
|
---|
997 | result = BUFFER_new();
|
---|
998 | if (result != NULL)
|
---|
999 | {
|
---|
1000 | if (constructSubscibeTypeVariableHeader(result, packetId) != 0)
|
---|
1001 | {
|
---|
1002 | /* Codes_SRS_MQTT_CODEC_07_029: [If any error is encountered then mqtt_codec_unsubscribe shall return NULL.] */
|
---|
1003 | BUFFER_delete(result);
|
---|
1004 | result = NULL;
|
---|
1005 | }
|
---|
1006 | else
|
---|
1007 | {
|
---|
1008 | STRING_HANDLE unsub_trace = NULL;
|
---|
1009 | if (trace_log != NULL)
|
---|
1010 | {
|
---|
1011 | unsub_trace = STRING_construct_sprintf(" | PACKET_ID: %"PRIu16, packetId);
|
---|
1012 | }
|
---|
1013 | /* Codes_SRS_MQTT_CODEC_07_028: [mqtt_codec_unsubscribe shall iterate through count items in the unsubscribeList.] */
|
---|
1014 | if (addListItemsToUnsubscribePacket(result, unsubscribeList, count, unsub_trace) != 0)
|
---|
1015 | {
|
---|
1016 | /* Codes_SRS_MQTT_CODEC_07_029: [If any error is encountered then mqtt_codec_unsubscribe shall return NULL.] */
|
---|
1017 | BUFFER_delete(result);
|
---|
1018 | result = NULL;
|
---|
1019 | }
|
---|
1020 | else
|
---|
1021 | {
|
---|
1022 | if (trace_log != NULL)
|
---|
1023 | {
|
---|
1024 | (void)STRING_copy(trace_log, "UNSUBSCRIBE");
|
---|
1025 | }
|
---|
1026 | if (constructFixedHeader(result, UNSUBSCRIBE_TYPE, UNSUBSCRIBE_FIXED_HEADER_FLAG) != 0)
|
---|
1027 | {
|
---|
1028 | /* Codes_SRS_MQTT_CODEC_07_029: [If any error is encountered then mqtt_codec_unsubscribe shall return NULL.] */
|
---|
1029 | BUFFER_delete(result);
|
---|
1030 | result = NULL;
|
---|
1031 | }
|
---|
1032 | else
|
---|
1033 | {
|
---|
1034 | if (trace_log != NULL)
|
---|
1035 | {
|
---|
1036 | (void)STRING_concat_with_STRING(trace_log, unsub_trace);
|
---|
1037 | }
|
---|
1038 | }
|
---|
1039 | }
|
---|
1040 | if (unsub_trace != NULL)
|
---|
1041 | {
|
---|
1042 | STRING_delete(unsub_trace);
|
---|
1043 | }
|
---|
1044 | }
|
---|
1045 | }
|
---|
1046 | }
|
---|
1047 | return result;
|
---|
1048 | }
|
---|
1049 |
|
---|
1050 | int mqtt_codec_bytesReceived(MQTTCODEC_HANDLE handle, const unsigned char* buffer, size_t size)
|
---|
1051 | {
|
---|
1052 | int result;
|
---|
1053 | MQTTCODEC_INSTANCE* codec_Data = (MQTTCODEC_INSTANCE*)handle;
|
---|
1054 | /* Codes_SRS_MQTT_CODEC_07_031: [If the parameters handle or buffer is NULL then mqtt_codec_bytesReceived shall return a non-zero value.] */
|
---|
1055 | if (codec_Data == NULL)
|
---|
1056 | {
|
---|
1057 | result = MU_FAILURE;
|
---|
1058 | }
|
---|
1059 | /* Codes_SRS_MQTT_CODEC_07_031: [If the parameters handle or buffer is NULL then mqtt_codec_bytesReceived shall return a non-zero value.] */
|
---|
1060 | /* Codes_SRS_MQTT_CODEC_07_032: [If the parameters size is zero then mqtt_codec_bytesReceived shall return a non-zero value.] */
|
---|
1061 | else if (buffer == NULL || size == 0)
|
---|
1062 | {
|
---|
1063 | codec_Data->currPacket = PACKET_TYPE_ERROR;
|
---|
1064 | result = MU_FAILURE;
|
---|
1065 | }
|
---|
1066 | else
|
---|
1067 | {
|
---|
1068 | /* Codes_SRS_MQTT_CODEC_07_033: [mqtt_codec_bytesReceived constructs a sequence of bytes into the corresponding MQTT packets and on success returns zero.] */
|
---|
1069 | result = 0;
|
---|
1070 | size_t index = 0;
|
---|
1071 | for (index = 0; index < size && result == 0; index++)
|
---|
1072 | {
|
---|
1073 | uint8_t iterator = ((int8_t*)buffer)[index];
|
---|
1074 | if (codec_Data->codecState == CODEC_STATE_FIXED_HEADER)
|
---|
1075 | {
|
---|
1076 | if (codec_Data->currPacket == UNKNOWN_TYPE)
|
---|
1077 | {
|
---|
1078 | codec_Data->currPacket = processControlPacketType(iterator, &codec_Data->headerFlags);
|
---|
1079 | }
|
---|
1080 | else
|
---|
1081 | {
|
---|
1082 | if (prepareheaderDataInfo(codec_Data, iterator) != 0)
|
---|
1083 | {
|
---|
1084 | /* Codes_SRS_MQTT_CODEC_07_035: [If any error is encountered then the packet state will be marked as error and mqtt_codec_bytesReceived shall return a non-zero value.] */
|
---|
1085 | codec_Data->currPacket = PACKET_TYPE_ERROR;
|
---|
1086 | result = MU_FAILURE;
|
---|
1087 | }
|
---|
1088 | if (codec_Data->currPacket == PINGRESP_TYPE)
|
---|
1089 | {
|
---|
1090 | /* Codes_SRS_MQTT_CODEC_07_034: [Upon a constructing a complete MQTT packet mqtt_codec_bytesReceived shall call the ON_PACKET_COMPLETE_CALLBACK function.] */
|
---|
1091 | completePacketData(codec_Data);
|
---|
1092 | }
|
---|
1093 | }
|
---|
1094 | }
|
---|
1095 | else if (codec_Data->codecState == CODEC_STATE_VAR_HEADER)
|
---|
1096 | {
|
---|
1097 | if (codec_Data->headerData == NULL)
|
---|
1098 | {
|
---|
1099 | codec_Data->codecState = CODEC_STATE_PAYLOAD;
|
---|
1100 | }
|
---|
1101 | else
|
---|
1102 | {
|
---|
1103 | uint8_t* dataBytes = BUFFER_u_char(codec_Data->headerData);
|
---|
1104 | if (dataBytes == NULL)
|
---|
1105 | {
|
---|
1106 | /* Codes_SRS_MQTT_CODEC_07_035: [If any error is encountered then the packet state will be marked as error and mqtt_codec_bytesReceived shall return a non-zero value.] */
|
---|
1107 | codec_Data->currPacket = PACKET_TYPE_ERROR;
|
---|
1108 | result = MU_FAILURE;
|
---|
1109 | }
|
---|
1110 | else
|
---|
1111 | {
|
---|
1112 | // Increment the data
|
---|
1113 | dataBytes += codec_Data->bufferOffset++;
|
---|
1114 | *dataBytes = iterator;
|
---|
1115 |
|
---|
1116 | size_t totalLen = BUFFER_length(codec_Data->headerData);
|
---|
1117 | if (codec_Data->bufferOffset >= totalLen)
|
---|
1118 | {
|
---|
1119 | /* Codes_SRS_MQTT_CODEC_07_034: [Upon a constructing a complete MQTT packet mqtt_codec_bytesReceived shall call the ON_PACKET_COMPLETE_CALLBACK function.] */
|
---|
1120 | completePacketData(codec_Data);
|
---|
1121 | }
|
---|
1122 | }
|
---|
1123 | }
|
---|
1124 | }
|
---|
1125 | else
|
---|
1126 | {
|
---|
1127 | /* Codes_SRS_MQTT_CODEC_07_035: [If any error is encountered then the packet state will be marked as error and mqtt_codec_bytesReceived shall return a non-zero value.] */
|
---|
1128 | codec_Data->currPacket = PACKET_TYPE_ERROR;
|
---|
1129 | result = MU_FAILURE;
|
---|
1130 | }
|
---|
1131 | }
|
---|
1132 | }
|
---|
1133 | return result;
|
---|
1134 | }
|
---|