Vergil Cola / Mbed OS MQTTGatewayK64

Fork of my MQTTGateway

Dependencies:   mbed-http

MQTTSManager/MQTTPacket/MQTTSubscribeServer.c@0:f1d3878b8dd9, 2017-04-08 (annotated)

Committer:
vpcola
Date:
Sat Apr 08 14:45:51 2017 +0000
Revision:
0:f1d3878b8dd9
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vpcola 0:f1d3878b8dd9 1 /*******************************************************************************
vpcola 0:f1d3878b8dd9 2 * Copyright (c) 2014 IBM Corp.
vpcola 0:f1d3878b8dd9 3 *
vpcola 0:f1d3878b8dd9 4 * All rights reserved. This program and the accompanying materials
vpcola 0:f1d3878b8dd9 5 * are made available under the terms of the Eclipse Public License v1.0
vpcola 0:f1d3878b8dd9 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
vpcola 0:f1d3878b8dd9 7 *
vpcola 0:f1d3878b8dd9 8 * The Eclipse Public License is available at
vpcola 0:f1d3878b8dd9 9 * http://www.eclipse.org/legal/epl-v10.html
vpcola 0:f1d3878b8dd9 10 * and the Eclipse Distribution License is available at
vpcola 0:f1d3878b8dd9 11 * http://www.eclipse.org/org/documents/edl-v10.php.
vpcola 0:f1d3878b8dd9 12 *
vpcola 0:f1d3878b8dd9 13 * Contributors:
vpcola 0:f1d3878b8dd9 14 * Ian Craggs - initial API and implementation and/or initial documentation
vpcola 0:f1d3878b8dd9 15 *******************************************************************************/
vpcola 0:f1d3878b8dd9 16
vpcola 0:f1d3878b8dd9 17 #include "MQTTPacket.h"
vpcola 0:f1d3878b8dd9 18 #include "StackTrace.h"
vpcola 0:f1d3878b8dd9 19
vpcola 0:f1d3878b8dd9 20 #include <string.h>
vpcola 0:f1d3878b8dd9 21
vpcola 0:f1d3878b8dd9 22
vpcola 0:f1d3878b8dd9 23 /**
vpcola 0:f1d3878b8dd9 24 * Deserializes the supplied (wire) buffer into subscribe data
vpcola 0:f1d3878b8dd9 25 * @param dup integer returned - the MQTT dup flag
vpcola 0:f1d3878b8dd9 26 * @param packetid integer returned - the MQTT packet identifier
vpcola 0:f1d3878b8dd9 27 * @param maxcount - the maximum number of members allowed in the topicFilters and requestedQoSs arrays
vpcola 0:f1d3878b8dd9 28 * @param count - number of members in the topicFilters and requestedQoSs arrays
vpcola 0:f1d3878b8dd9 29 * @param topicFilters - array of topic filter names
vpcola 0:f1d3878b8dd9 30 * @param requestedQoSs - array of requested QoS
vpcola 0:f1d3878b8dd9 31 * @param buf the raw buffer data, of the correct length determined by the remaining length field
vpcola 0:f1d3878b8dd9 32 * @param buflen the length in bytes of the data in the supplied buffer
vpcola 0:f1d3878b8dd9 33 * @return the length of the serialized data. <= 0 indicates error
vpcola 0:f1d3878b8dd9 34 */
vpcola 0:f1d3878b8dd9 35 int MQTTDeserialize_subscribe(unsigned char* dup, unsigned short* packetid, int maxcount, int* count, MQTTString topicFilters[],
vpcola 0:f1d3878b8dd9 36 int requestedQoSs[], unsigned char* buf, int buflen)
vpcola 0:f1d3878b8dd9 37 {
vpcola 0:f1d3878b8dd9 38 MQTTHeader header = {0};
vpcola 0:f1d3878b8dd9 39 unsigned char* curdata = buf;
vpcola 0:f1d3878b8dd9 40 unsigned char* enddata = NULL;
vpcola 0:f1d3878b8dd9 41 int rc = -1;
vpcola 0:f1d3878b8dd9 42 int mylen = 0;
vpcola 0:f1d3878b8dd9 43
vpcola 0:f1d3878b8dd9 44 FUNC_ENTRY;
vpcola 0:f1d3878b8dd9 45 header.byte = readChar(&curdata);
vpcola 0:f1d3878b8dd9 46 if (header.bits.type != SUBSCRIBE)
vpcola 0:f1d3878b8dd9 47 goto exit;
vpcola 0:f1d3878b8dd9 48 *dup = header.bits.dup;
vpcola 0:f1d3878b8dd9 49
vpcola 0:f1d3878b8dd9 50 curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
vpcola 0:f1d3878b8dd9 51 enddata = curdata + mylen;
vpcola 0:f1d3878b8dd9 52
vpcola 0:f1d3878b8dd9 53 *packetid = readInt(&curdata);
vpcola 0:f1d3878b8dd9 54
vpcola 0:f1d3878b8dd9 55 *count = 0;
vpcola 0:f1d3878b8dd9 56 while (curdata < enddata)
vpcola 0:f1d3878b8dd9 57 {
vpcola 0:f1d3878b8dd9 58 if (!readMQTTLenString(&topicFilters[*count], &curdata, enddata))
vpcola 0:f1d3878b8dd9 59 goto exit;
vpcola 0:f1d3878b8dd9 60 if (curdata >= enddata) /* do we have enough data to read the req_qos version byte? */
vpcola 0:f1d3878b8dd9 61 goto exit;
vpcola 0:f1d3878b8dd9 62 requestedQoSs[*count] = readChar(&curdata);
vpcola 0:f1d3878b8dd9 63 (*count)++;
vpcola 0:f1d3878b8dd9 64 }
vpcola 0:f1d3878b8dd9 65
vpcola 0:f1d3878b8dd9 66 rc = 1;
vpcola 0:f1d3878b8dd9 67 exit:
vpcola 0:f1d3878b8dd9 68 FUNC_EXIT_RC(rc);
vpcola 0:f1d3878b8dd9 69 return rc;
vpcola 0:f1d3878b8dd9 70 }
vpcola 0:f1d3878b8dd9 71
vpcola 0:f1d3878b8dd9 72
vpcola 0:f1d3878b8dd9 73 /**
vpcola 0:f1d3878b8dd9 74 * Serializes the supplied suback data into the supplied buffer, ready for sending
vpcola 0:f1d3878b8dd9 75 * @param buf the buffer into which the packet will be serialized
vpcola 0:f1d3878b8dd9 76 * @param buflen the length in bytes of the supplied buffer
vpcola 0:f1d3878b8dd9 77 * @param packetid integer - the MQTT packet identifier
vpcola 0:f1d3878b8dd9 78 * @param count - number of members in the grantedQoSs array
vpcola 0:f1d3878b8dd9 79 * @param grantedQoSs - array of granted QoS
vpcola 0:f1d3878b8dd9 80 * @return the length of the serialized data. <= 0 indicates error
vpcola 0:f1d3878b8dd9 81 */
vpcola 0:f1d3878b8dd9 82 int MQTTSerialize_suback(unsigned char* buf, int buflen, unsigned short packetid, int count, int* grantedQoSs)
vpcola 0:f1d3878b8dd9 83 {
vpcola 0:f1d3878b8dd9 84 MQTTHeader header = {0};
vpcola 0:f1d3878b8dd9 85 int rc = -1;
vpcola 0:f1d3878b8dd9 86 unsigned char *ptr = buf;
vpcola 0:f1d3878b8dd9 87 int i;
vpcola 0:f1d3878b8dd9 88
vpcola 0:f1d3878b8dd9 89 FUNC_ENTRY;
vpcola 0:f1d3878b8dd9 90 if (buflen < 2 + count)
vpcola 0:f1d3878b8dd9 91 {
vpcola 0:f1d3878b8dd9 92 rc = MQTTPACKET_BUFFER_TOO_SHORT;
vpcola 0:f1d3878b8dd9 93 goto exit;
vpcola 0:f1d3878b8dd9 94 }
vpcola 0:f1d3878b8dd9 95 header.byte = 0;
vpcola 0:f1d3878b8dd9 96 header.bits.type = SUBACK;
vpcola 0:f1d3878b8dd9 97 writeChar(&ptr, header.byte); /* write header */
vpcola 0:f1d3878b8dd9 98
vpcola 0:f1d3878b8dd9 99 ptr += MQTTPacket_encode(ptr, 2 + count); /* write remaining length */
vpcola 0:f1d3878b8dd9 100
vpcola 0:f1d3878b8dd9 101 writeInt(&ptr, packetid);
vpcola 0:f1d3878b8dd9 102
vpcola 0:f1d3878b8dd9 103 for (i = 0; i < count; ++i)
vpcola 0:f1d3878b8dd9 104 writeChar(&ptr, grantedQoSs[i]);
vpcola 0:f1d3878b8dd9 105
vpcola 0:f1d3878b8dd9 106 rc = ptr - buf;
vpcola 0:f1d3878b8dd9 107 exit:
vpcola 0:f1d3878b8dd9 108 FUNC_EXIT_RC(rc);
vpcola 0:f1d3878b8dd9 109 return rc;
vpcola 0:f1d3878b8dd9 110 }
vpcola 0:f1d3878b8dd9 111
vpcola 0:f1d3878b8dd9 112