Vergil Cola / Mbed OS MQTTGateway2

Fork of my original MQTTGateway

Dependencies:   mbed-http

MQTTSManager/MQTTPacket/MQTTUnsubscribeServer.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 /**
vpcola 0:a1734fe1ec4b 24 * Deserializes the supplied (wire) buffer into unsubscribe data
vpcola 0:a1734fe1ec4b 25 * @param dup integer returned - the MQTT dup flag
vpcola 0:a1734fe1ec4b 26 * @param packetid integer returned - the MQTT packet identifier
vpcola 0:a1734fe1ec4b 27 * @param maxcount - the maximum number of members allowed in the topicFilters and requestedQoSs arrays
vpcola 0:a1734fe1ec4b 28 * @param count - number of members in the topicFilters and requestedQoSs arrays
vpcola 0:a1734fe1ec4b 29 * @param topicFilters - array of topic filter names
vpcola 0:a1734fe1ec4b 30 * @param buf the raw buffer data, of the correct length determined by the remaining length field
vpcola 0:a1734fe1ec4b 31 * @param buflen the length in bytes of the data in the supplied buffer
vpcola 0:a1734fe1ec4b 32 * @return the length of the serialized data. <= 0 indicates error
vpcola 0:a1734fe1ec4b 33 */
vpcola 0:a1734fe1ec4b 34 int MQTTDeserialize_unsubscribe(unsigned char* dup, unsigned short* packetid, int maxcount, int* count, MQTTString topicFilters[],
vpcola 0:a1734fe1ec4b 35 unsigned char* buf, int len)
vpcola 0:a1734fe1ec4b 36 {
vpcola 0:a1734fe1ec4b 37 MQTTHeader header = {0};
vpcola 0:a1734fe1ec4b 38 unsigned char* curdata = buf;
vpcola 0:a1734fe1ec4b 39 unsigned char* enddata = NULL;
vpcola 0:a1734fe1ec4b 40 int rc = 0;
vpcola 0:a1734fe1ec4b 41 int mylen = 0;
vpcola 0:a1734fe1ec4b 42
vpcola 0:a1734fe1ec4b 43 FUNC_ENTRY;
vpcola 0:a1734fe1ec4b 44 header.byte = readChar(&curdata);
vpcola 0:a1734fe1ec4b 45 if (header.bits.type != UNSUBSCRIBE)
vpcola 0:a1734fe1ec4b 46 goto exit;
vpcola 0:a1734fe1ec4b 47 *dup = header.bits.dup;
vpcola 0:a1734fe1ec4b 48
vpcola 0:a1734fe1ec4b 49 curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
vpcola 0:a1734fe1ec4b 50 enddata = curdata + mylen;
vpcola 0:a1734fe1ec4b 51
vpcola 0:a1734fe1ec4b 52 *packetid = readInt(&curdata);
vpcola 0:a1734fe1ec4b 53
vpcola 0:a1734fe1ec4b 54 *count = 0;
vpcola 0:a1734fe1ec4b 55 while (curdata < enddata)
vpcola 0:a1734fe1ec4b 56 {
vpcola 0:a1734fe1ec4b 57 if (!readMQTTLenString(&topicFilters[*count], &curdata, enddata))
vpcola 0:a1734fe1ec4b 58 goto exit;
vpcola 0:a1734fe1ec4b 59 (*count)++;
vpcola 0:a1734fe1ec4b 60 }
vpcola 0:a1734fe1ec4b 61
vpcola 0:a1734fe1ec4b 62 rc = 1;
vpcola 0:a1734fe1ec4b 63 exit:
vpcola 0:a1734fe1ec4b 64 FUNC_EXIT_RC(rc);
vpcola 0:a1734fe1ec4b 65 return rc;
vpcola 0:a1734fe1ec4b 66 }
vpcola 0:a1734fe1ec4b 67
vpcola 0:a1734fe1ec4b 68
vpcola 0:a1734fe1ec4b 69 /**
vpcola 0:a1734fe1ec4b 70 * Serializes the supplied unsuback data into the supplied buffer, ready for sending
vpcola 0:a1734fe1ec4b 71 * @param buf the buffer into which the packet will be serialized
vpcola 0:a1734fe1ec4b 72 * @param buflen the length in bytes of the supplied buffer
vpcola 0:a1734fe1ec4b 73 * @param packetid integer - the MQTT packet identifier
vpcola 0:a1734fe1ec4b 74 * @return the length of the serialized data. <= 0 indicates error
vpcola 0:a1734fe1ec4b 75 */
vpcola 0:a1734fe1ec4b 76 int MQTTSerialize_unsuback(unsigned char* buf, int buflen, unsigned short packetid)
vpcola 0:a1734fe1ec4b 77 {
vpcola 0:a1734fe1ec4b 78 MQTTHeader header = {0};
vpcola 0:a1734fe1ec4b 79 int rc = 0;
vpcola 0:a1734fe1ec4b 80 unsigned char *ptr = buf;
vpcola 0:a1734fe1ec4b 81
vpcola 0:a1734fe1ec4b 82 FUNC_ENTRY;
vpcola 0:a1734fe1ec4b 83 if (buflen < 2)
vpcola 0:a1734fe1ec4b 84 {
vpcola 0:a1734fe1ec4b 85 rc = MQTTPACKET_BUFFER_TOO_SHORT;
vpcola 0:a1734fe1ec4b 86 goto exit;
vpcola 0:a1734fe1ec4b 87 }
vpcola 0:a1734fe1ec4b 88 header.byte = 0;
vpcola 0:a1734fe1ec4b 89 header.bits.type = UNSUBACK;
vpcola 0:a1734fe1ec4b 90 writeChar(&ptr, header.byte); /* write header */
vpcola 0:a1734fe1ec4b 91
vpcola 0:a1734fe1ec4b 92 ptr += MQTTPacket_encode(ptr, 2); /* write remaining length */
vpcola 0:a1734fe1ec4b 93
vpcola 0:a1734fe1ec4b 94 writeInt(&ptr, packetid);
vpcola 0:a1734fe1ec4b 95
vpcola 0:a1734fe1ec4b 96 rc = ptr - buf;
vpcola 0:a1734fe1ec4b 97 exit:
vpcola 0:a1734fe1ec4b 98 FUNC_EXIT_RC(rc);
vpcola 0:a1734fe1ec4b 99 return rc;
vpcola 0:a1734fe1ec4b 100 }
vpcola 0:a1734fe1ec4b 101
vpcola 0:a1734fe1ec4b 102