Jim Flynn / MQTT

Version to make it easier to reuse without source modifications

MQTTPacket/MQTTSubscribeServer.c@0:5cd4781e0c88, 2018-03-27 (annotated)

Committer:
JMF
Date:
Tue Mar 27 17:26:35 2018 +0000
Revision:
0:5cd4781e0c88
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JMF 0:5cd4781e0c88 1 /*******************************************************************************
JMF 0:5cd4781e0c88 2 * Copyright (c) 2014 IBM Corp.
JMF 0:5cd4781e0c88 3 *
JMF 0:5cd4781e0c88 4 * All rights reserved. This program and the accompanying materials
JMF 0:5cd4781e0c88 5 * are made available under the terms of the Eclipse Public License v1.0
JMF 0:5cd4781e0c88 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
JMF 0:5cd4781e0c88 7 *
JMF 0:5cd4781e0c88 8 * The Eclipse Public License is available at
JMF 0:5cd4781e0c88 9 * http://www.eclipse.org/legal/epl-v10.html
JMF 0:5cd4781e0c88 10 * and the Eclipse Distribution License is available at
JMF 0:5cd4781e0c88 11 * http://www.eclipse.org/org/documents/edl-v10.php.
JMF 0:5cd4781e0c88 12 *
JMF 0:5cd4781e0c88 13 * Contributors:
JMF 0:5cd4781e0c88 14 * Ian Craggs - initial API and implementation and/or initial documentation
JMF 0:5cd4781e0c88 15 *******************************************************************************/
JMF 0:5cd4781e0c88 16
JMF 0:5cd4781e0c88 17 #include "MQTTPacket.h"
JMF 0:5cd4781e0c88 18 #include "StackTrace.h"
JMF 0:5cd4781e0c88 19
JMF 0:5cd4781e0c88 20 #include <string.h>
JMF 0:5cd4781e0c88 21
JMF 0:5cd4781e0c88 22
JMF 0:5cd4781e0c88 23 /**
JMF 0:5cd4781e0c88 24 * Deserializes the supplied (wire) buffer into subscribe data
JMF 0:5cd4781e0c88 25 * @param dup integer returned - the MQTT dup flag
JMF 0:5cd4781e0c88 26 * @param packetid integer returned - the MQTT packet identifier
JMF 0:5cd4781e0c88 27 * @param maxcount - the maximum number of members allowed in the topicFilters and requestedQoSs arrays
JMF 0:5cd4781e0c88 28 * @param count - number of members in the topicFilters and requestedQoSs arrays
JMF 0:5cd4781e0c88 29 * @param topicFilters - array of topic filter names
JMF 0:5cd4781e0c88 30 * @param requestedQoSs - array of requested QoS
JMF 0:5cd4781e0c88 31 * @param buf the raw buffer data, of the correct length determined by the remaining length field
JMF 0:5cd4781e0c88 32 * @param buflen the length in bytes of the data in the supplied buffer
JMF 0:5cd4781e0c88 33 * @return the length of the serialized data. <= 0 indicates error
JMF 0:5cd4781e0c88 34 */
JMF 0:5cd4781e0c88 35 int MQTTDeserialize_subscribe(unsigned char* dup, unsigned short* packetid, int maxcount, int* count, MQTTString topicFilters[],
JMF 0:5cd4781e0c88 36 int requestedQoSs[], unsigned char* buf, int buflen)
JMF 0:5cd4781e0c88 37 {
JMF 0:5cd4781e0c88 38 MQTTHeader header = {0};
JMF 0:5cd4781e0c88 39 unsigned char* curdata = buf;
JMF 0:5cd4781e0c88 40 unsigned char* enddata = NULL;
JMF 0:5cd4781e0c88 41 int rc = -1;
JMF 0:5cd4781e0c88 42 int mylen = 0;
JMF 0:5cd4781e0c88 43
JMF 0:5cd4781e0c88 44 FUNC_ENTRY;
JMF 0:5cd4781e0c88 45 header.byte = readChar(&curdata);
JMF 0:5cd4781e0c88 46 if (header.bits.type != SUBSCRIBE)
JMF 0:5cd4781e0c88 47 goto exit;
JMF 0:5cd4781e0c88 48 *dup = header.bits.dup;
JMF 0:5cd4781e0c88 49
JMF 0:5cd4781e0c88 50 curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
JMF 0:5cd4781e0c88 51 enddata = curdata + mylen;
JMF 0:5cd4781e0c88 52
JMF 0:5cd4781e0c88 53 *packetid = readInt(&curdata);
JMF 0:5cd4781e0c88 54
JMF 0:5cd4781e0c88 55 *count = 0;
JMF 0:5cd4781e0c88 56 while (curdata < enddata)
JMF 0:5cd4781e0c88 57 {
JMF 0:5cd4781e0c88 58 if (!readMQTTLenString(&topicFilters[*count], &curdata, enddata))
JMF 0:5cd4781e0c88 59 goto exit;
JMF 0:5cd4781e0c88 60 if (curdata >= enddata) /* do we have enough data to read the req_qos version byte? */
JMF 0:5cd4781e0c88 61 goto exit;
JMF 0:5cd4781e0c88 62 requestedQoSs[*count] = readChar(&curdata);
JMF 0:5cd4781e0c88 63 (*count)++;
JMF 0:5cd4781e0c88 64 }
JMF 0:5cd4781e0c88 65
JMF 0:5cd4781e0c88 66 rc = 1;
JMF 0:5cd4781e0c88 67 exit:
JMF 0:5cd4781e0c88 68 FUNC_EXIT_RC(rc);
JMF 0:5cd4781e0c88 69 return rc;
JMF 0:5cd4781e0c88 70 }
JMF 0:5cd4781e0c88 71
JMF 0:5cd4781e0c88 72
JMF 0:5cd4781e0c88 73 /**
JMF 0:5cd4781e0c88 74 * Serializes the supplied suback data into the supplied buffer, ready for sending
JMF 0:5cd4781e0c88 75 * @param buf the buffer into which the packet will be serialized
JMF 0:5cd4781e0c88 76 * @param buflen the length in bytes of the supplied buffer
JMF 0:5cd4781e0c88 77 * @param packetid integer - the MQTT packet identifier
JMF 0:5cd4781e0c88 78 * @param count - number of members in the grantedQoSs array
JMF 0:5cd4781e0c88 79 * @param grantedQoSs - array of granted QoS
JMF 0:5cd4781e0c88 80 * @return the length of the serialized data. <= 0 indicates error
JMF 0:5cd4781e0c88 81 */
JMF 0:5cd4781e0c88 82 int MQTTSerialize_suback(unsigned char* buf, int buflen, unsigned short packetid, int count, int* grantedQoSs)
JMF 0:5cd4781e0c88 83 {
JMF 0:5cd4781e0c88 84 MQTTHeader header = {0};
JMF 0:5cd4781e0c88 85 int rc = -1;
JMF 0:5cd4781e0c88 86 unsigned char *ptr = buf;
JMF 0:5cd4781e0c88 87 int i;
JMF 0:5cd4781e0c88 88
JMF 0:5cd4781e0c88 89 FUNC_ENTRY;
JMF 0:5cd4781e0c88 90 if (buflen < 2 + count)
JMF 0:5cd4781e0c88 91 {
JMF 0:5cd4781e0c88 92 rc = MQTTPACKET_BUFFER_TOO_SHORT;
JMF 0:5cd4781e0c88 93 goto exit;
JMF 0:5cd4781e0c88 94 }
JMF 0:5cd4781e0c88 95 header.byte = 0;
JMF 0:5cd4781e0c88 96 header.bits.type = SUBACK;
JMF 0:5cd4781e0c88 97 writeChar(&ptr, header.byte); /* write header */
JMF 0:5cd4781e0c88 98
JMF 0:5cd4781e0c88 99 ptr += MQTTPacket_encode(ptr, 2 + count); /* write remaining length */
JMF 0:5cd4781e0c88 100
JMF 0:5cd4781e0c88 101 writeInt(&ptr, packetid);
JMF 0:5cd4781e0c88 102
JMF 0:5cd4781e0c88 103 for (i = 0; i < count; ++i)
JMF 0:5cd4781e0c88 104 writeChar(&ptr, grantedQoSs[i]);
JMF 0:5cd4781e0c88 105
JMF 0:5cd4781e0c88 106 rc = ptr - buf;
JMF 0:5cd4781e0c88 107 exit:
JMF 0:5cd4781e0c88 108 FUNC_EXIT_RC(rc);
JMF 0:5cd4781e0c88 109 return rc;
JMF 0:5cd4781e0c88 110 }
JMF 0:5cd4781e0c88 111
JMF 0:5cd4781e0c88 112