Vergil Cola / Mbed OS MQTTGateway2

Fork of my original MQTTGateway

Dependencies:   mbed-http

MQTTSManager/MQTTPacket/MQTTSubscribeClient.c@0:a1734fe1ec4b, 2017-04-08 (annotated)

Committer:
vpcola
Date:
Sat Apr 08 14:43:14 2017 +0000
Revision:
0:a1734fe1ec4b
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vpcola 0:a1734fe1ec4b 1 /*******************************************************************************
vpcola 0:a1734fe1ec4b 2 * Copyright (c) 2014 IBM Corp.
vpcola 0:a1734fe1ec4b 3 *
vpcola 0:a1734fe1ec4b 4 * All rights reserved. This program and the accompanying materials
vpcola 0:a1734fe1ec4b 5 * are made available under the terms of the Eclipse Public License v1.0
vpcola 0:a1734fe1ec4b 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
vpcola 0:a1734fe1ec4b 7 *
vpcola 0:a1734fe1ec4b 8 * The Eclipse Public License is available at
vpcola 0:a1734fe1ec4b 9 * http://www.eclipse.org/legal/epl-v10.html
vpcola 0:a1734fe1ec4b 10 * and the Eclipse Distribution License is available at
vpcola 0:a1734fe1ec4b 11 * http://www.eclipse.org/org/documents/edl-v10.php.
vpcola 0:a1734fe1ec4b 12 *
vpcola 0:a1734fe1ec4b 13 * Contributors:
vpcola 0:a1734fe1ec4b 14 * Ian Craggs - initial API and implementation and/or initial documentation
vpcola 0:a1734fe1ec4b 15 *******************************************************************************/
vpcola 0:a1734fe1ec4b 16
vpcola 0:a1734fe1ec4b 17 #include "MQTTPacket.h"
vpcola 0:a1734fe1ec4b 18 #include "StackTrace.h"
vpcola 0:a1734fe1ec4b 19
vpcola 0:a1734fe1ec4b 20 #include <string.h>
vpcola 0:a1734fe1ec4b 21
vpcola 0:a1734fe1ec4b 22 /**
vpcola 0:a1734fe1ec4b 23 * Determines the length of the MQTT subscribe packet that would be produced using the supplied parameters
vpcola 0:a1734fe1ec4b 24 * @param count the number of topic filter strings in topicFilters
vpcola 0:a1734fe1ec4b 25 * @param topicFilters the array of topic filter strings to be used in the publish
vpcola 0:a1734fe1ec4b 26 * @return the length of buffer needed to contain the serialized version of the packet
vpcola 0:a1734fe1ec4b 27 */
vpcola 0:a1734fe1ec4b 28 int MQTTSerialize_subscribeLength(int count, MQTTString topicFilters[])
vpcola 0:a1734fe1ec4b 29 {
vpcola 0:a1734fe1ec4b 30 int i;
vpcola 0:a1734fe1ec4b 31 int len = 2; /* packetid */
vpcola 0:a1734fe1ec4b 32
vpcola 0:a1734fe1ec4b 33 for (i = 0; i < count; ++i)
vpcola 0:a1734fe1ec4b 34 len += 2 + MQTTstrlen(topicFilters[i]) + 1; /* length + topic + req_qos */
vpcola 0:a1734fe1ec4b 35 return len;
vpcola 0:a1734fe1ec4b 36 }
vpcola 0:a1734fe1ec4b 37
vpcola 0:a1734fe1ec4b 38
vpcola 0:a1734fe1ec4b 39 /**
vpcola 0:a1734fe1ec4b 40 * Serializes the supplied subscribe data into the supplied buffer, ready for sending
vpcola 0:a1734fe1ec4b 41 * @param buf the buffer into which the packet will be serialized
vpcola 0:a1734fe1ec4b 42 * @param buflen the length in bytes of the supplied bufferr
vpcola 0:a1734fe1ec4b 43 * @param dup integer - the MQTT dup flag
vpcola 0:a1734fe1ec4b 44 * @param packetid integer - the MQTT packet identifier
vpcola 0:a1734fe1ec4b 45 * @param count - number of members in the topicFilters and reqQos arrays
vpcola 0:a1734fe1ec4b 46 * @param topicFilters - array of topic filter names
vpcola 0:a1734fe1ec4b 47 * @param requestedQoSs - array of requested QoS
vpcola 0:a1734fe1ec4b 48 * @return the length of the serialized data. <= 0 indicates error
vpcola 0:a1734fe1ec4b 49 */
vpcola 0:a1734fe1ec4b 50 int MQTTSerialize_subscribe(unsigned char* buf, int buflen, unsigned char dup, unsigned short packetid, int count,
vpcola 0:a1734fe1ec4b 51 MQTTString topicFilters[], int requestedQoSs[])
vpcola 0:a1734fe1ec4b 52 {
vpcola 0:a1734fe1ec4b 53 unsigned char *ptr = buf;
vpcola 0:a1734fe1ec4b 54 MQTTHeader header = {0};
vpcola 0:a1734fe1ec4b 55 int rem_len = 0;
vpcola 0:a1734fe1ec4b 56 int rc = 0;
vpcola 0:a1734fe1ec4b 57 int i = 0;
vpcola 0:a1734fe1ec4b 58
vpcola 0:a1734fe1ec4b 59 FUNC_ENTRY;
vpcola 0:a1734fe1ec4b 60 if (MQTTPacket_len(rem_len = MQTTSerialize_subscribeLength(count, topicFilters)) > buflen)
vpcola 0:a1734fe1ec4b 61 {
vpcola 0:a1734fe1ec4b 62 rc = MQTTPACKET_BUFFER_TOO_SHORT;
vpcola 0:a1734fe1ec4b 63 goto exit;
vpcola 0:a1734fe1ec4b 64 }
vpcola 0:a1734fe1ec4b 65
vpcola 0:a1734fe1ec4b 66 header.byte = 0;
vpcola 0:a1734fe1ec4b 67 header.bits.type = SUBSCRIBE;
vpcola 0:a1734fe1ec4b 68 header.bits.dup = dup;
vpcola 0:a1734fe1ec4b 69 header.bits.qos = 1;
vpcola 0:a1734fe1ec4b 70 writeChar(&ptr, header.byte); /* write header */
vpcola 0:a1734fe1ec4b 71
vpcola 0:a1734fe1ec4b 72 ptr += MQTTPacket_encode(ptr, rem_len); /* write remaining length */;
vpcola 0:a1734fe1ec4b 73
vpcola 0:a1734fe1ec4b 74 writeInt(&ptr, packetid);
vpcola 0:a1734fe1ec4b 75
vpcola 0:a1734fe1ec4b 76 for (i = 0; i < count; ++i)
vpcola 0:a1734fe1ec4b 77 {
vpcola 0:a1734fe1ec4b 78 writeMQTTString(&ptr, topicFilters[i]);
vpcola 0:a1734fe1ec4b 79 writeChar(&ptr, requestedQoSs[i]);
vpcola 0:a1734fe1ec4b 80 }
vpcola 0:a1734fe1ec4b 81
vpcola 0:a1734fe1ec4b 82 rc = ptr - buf;
vpcola 0:a1734fe1ec4b 83 exit:
vpcola 0:a1734fe1ec4b 84 FUNC_EXIT_RC(rc);
vpcola 0:a1734fe1ec4b 85 return rc;
vpcola 0:a1734fe1ec4b 86 }
vpcola 0:a1734fe1ec4b 87
vpcola 0:a1734fe1ec4b 88
vpcola 0:a1734fe1ec4b 89
vpcola 0:a1734fe1ec4b 90 /**
vpcola 0:a1734fe1ec4b 91 * Deserializes the supplied (wire) buffer into suback data
vpcola 0:a1734fe1ec4b 92 * @param packetid returned integer - the MQTT packet identifier
vpcola 0:a1734fe1ec4b 93 * @param maxcount - the maximum number of members allowed in the grantedQoSs array
vpcola 0:a1734fe1ec4b 94 * @param count returned integer - number of members in the grantedQoSs array
vpcola 0:a1734fe1ec4b 95 * @param grantedQoSs returned array of integers - the granted qualities of service
vpcola 0:a1734fe1ec4b 96 * @param buf the raw buffer data, of the correct length determined by the remaining length field
vpcola 0:a1734fe1ec4b 97 * @param buflen the length in bytes of the data in the supplied buffer
vpcola 0:a1734fe1ec4b 98 * @return error code. 1 is success, 0 is failure
vpcola 0:a1734fe1ec4b 99 */
vpcola 0:a1734fe1ec4b 100 int MQTTDeserialize_suback(unsigned short* packetid, int maxcount, int* count, int grantedQoSs[], unsigned char* buf, int buflen)
vpcola 0:a1734fe1ec4b 101 {
vpcola 0:a1734fe1ec4b 102 MQTTHeader header = {0};
vpcola 0:a1734fe1ec4b 103 unsigned char* curdata = buf;
vpcola 0:a1734fe1ec4b 104 unsigned char* enddata = NULL;
vpcola 0:a1734fe1ec4b 105 int rc = 0;
vpcola 0:a1734fe1ec4b 106 int mylen;
vpcola 0:a1734fe1ec4b 107
vpcola 0:a1734fe1ec4b 108 FUNC_ENTRY;
vpcola 0:a1734fe1ec4b 109 header.byte = readChar(&curdata);
vpcola 0:a1734fe1ec4b 110 if (header.bits.type != SUBACK)
vpcola 0:a1734fe1ec4b 111 goto exit;
vpcola 0:a1734fe1ec4b 112
vpcola 0:a1734fe1ec4b 113 curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
vpcola 0:a1734fe1ec4b 114 enddata = curdata + mylen;
vpcola 0:a1734fe1ec4b 115 if (enddata - curdata < 2)
vpcola 0:a1734fe1ec4b 116 goto exit;
vpcola 0:a1734fe1ec4b 117
vpcola 0:a1734fe1ec4b 118 *packetid = readInt(&curdata);
vpcola 0:a1734fe1ec4b 119
vpcola 0:a1734fe1ec4b 120 *count = 0;
vpcola 0:a1734fe1ec4b 121 while (curdata < enddata)
vpcola 0:a1734fe1ec4b 122 {
vpcola 0:a1734fe1ec4b 123 if (*count > maxcount)
vpcola 0:a1734fe1ec4b 124 {
vpcola 0:a1734fe1ec4b 125 rc = -1;
vpcola 0:a1734fe1ec4b 126 goto exit;
vpcola 0:a1734fe1ec4b 127 }
vpcola 0:a1734fe1ec4b 128 grantedQoSs[(*count)++] = readChar(&curdata);
vpcola 0:a1734fe1ec4b 129 }
vpcola 0:a1734fe1ec4b 130
vpcola 0:a1734fe1ec4b 131 rc = 1;
vpcola 0:a1734fe1ec4b 132 exit:
vpcola 0:a1734fe1ec4b 133 FUNC_EXIT_RC(rc);
vpcola 0:a1734fe1ec4b 134 return rc;
vpcola 0:a1734fe1ec4b 135 }
vpcola 0:a1734fe1ec4b 136
vpcola 0:a1734fe1ec4b 137