Ian Craggs / MQTTSNPacket

Low level MQTTSN packet library, part of the Eclipse Paho project: http://eclipse.org/paho

Dependents:   MQTTSN sara-n200-hello-mqtt-sn MQTTSN_2

The master source for this project is held at: https://github.com/eclipse/paho.mqtt-sn.embedded-c

MQTTSNUnsubscribeServer.c@1:7fa362fa563f, 2016-01-06 (annotated)

Committer:
icraggs
Date:
Wed Jan 06 14:19:27 2016 +0000
Revision:
1:7fa362fa563f
Parent:
0:c524a894b5e8 
Internal function name changes to avoid name clashes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
icraggs 1:7fa362fa563f 1 /*******************************************************************************
icraggs 1:7fa362fa563f 2 * Copyright (c) 2014 IBM Corp.
icraggs 1:7fa362fa563f 3 *
icraggs 1:7fa362fa563f 4 * All rights reserved. This program and the accompanying materials
icraggs 1:7fa362fa563f 5 * are made available under the terms of the Eclipse Public License v1.0
icraggs 1:7fa362fa563f 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
icraggs 1:7fa362fa563f 7 *
icraggs 1:7fa362fa563f 8 * The Eclipse Public License is available at
icraggs 1:7fa362fa563f 9 * http://www.eclipse.org/legal/epl-v10.html
icraggs 1:7fa362fa563f 10 * and the Eclipse Distribution License is available at
icraggs 1:7fa362fa563f 11 * http://www.eclipse.org/org/documents/edl-v10.php.
icraggs 1:7fa362fa563f 12 *
icraggs 1:7fa362fa563f 13 * Contributors:
icraggs 1:7fa362fa563f 14 * Ian Craggs - initial API and implementation and/or initial documentation
icraggs 1:7fa362fa563f 15 *******************************************************************************/
icraggs 1:7fa362fa563f 16
icraggs 1:7fa362fa563f 17 #include "StackTrace.h"
icraggs 1:7fa362fa563f 18 #include "MQTTSNPacket.h"
icraggs 1:7fa362fa563f 19
icraggs 1:7fa362fa563f 20 int MQTTSNDeserialize_unsubscribe(unsigned short* packetid, MQTTSN_topicid* topicFilter,
icraggs 1:7fa362fa563f 21 unsigned char* buf, int buflen)
icraggs 1:7fa362fa563f 22 {
icraggs 1:7fa362fa563f 23 MQTTSNFlags flags;
icraggs 1:7fa362fa563f 24 unsigned char* curdata = buf;
icraggs 1:7fa362fa563f 25 unsigned char* enddata = NULL;
icraggs 1:7fa362fa563f 26 int rc = 0;
icraggs 1:7fa362fa563f 27 int mylen = 0;
icraggs 1:7fa362fa563f 28
icraggs 1:7fa362fa563f 29 FUNC_ENTRY;
icraggs 1:7fa362fa563f 30 curdata += (rc = MQTTSNPacket_decode(curdata, buflen, &mylen)); /* read length */
icraggs 1:7fa362fa563f 31 enddata = buf + mylen;
icraggs 1:7fa362fa563f 32 if (enddata - curdata > buflen)
icraggs 1:7fa362fa563f 33 goto exit;
icraggs 1:7fa362fa563f 34
icraggs 1:7fa362fa563f 35 if (MQTTSNPacket_readChar(&curdata) != MQTTSN_UNSUBSCRIBE)
icraggs 1:7fa362fa563f 36 goto exit;
icraggs 1:7fa362fa563f 37
icraggs 1:7fa362fa563f 38 flags.all = MQTTSNPacket_readChar(&curdata);
icraggs 1:7fa362fa563f 39 *packetid = MQTTSNPacket_readInt(&curdata);
icraggs 0:c524a894b5e8 40
icraggs 1:7fa362fa563f 41 topicFilter->type = flags.bits.topicIdType;
icraggs 1:7fa362fa563f 42 if (topicFilter->type == MQTTSN_TOPIC_TYPE_NORMAL)
icraggs 1:7fa362fa563f 43 {
icraggs 1:7fa362fa563f 44 topicFilter->data.long_.len = enddata - curdata;
icraggs 1:7fa362fa563f 45 topicFilter->data.long_.name = (char*)curdata;
icraggs 1:7fa362fa563f 46 }
icraggs 1:7fa362fa563f 47 else if (topicFilter->type == MQTTSN_TOPIC_TYPE_PREDEFINED)
icraggs 1:7fa362fa563f 48 topicFilter->data.id = MQTTSNPacket_readInt(&curdata);
icraggs 1:7fa362fa563f 49 else if (topicFilter->type == MQTTSN_TOPIC_TYPE_SHORT)
icraggs 1:7fa362fa563f 50 {
icraggs 1:7fa362fa563f 51 topicFilter->data.short_name[0] = MQTTSNPacket_readChar(&curdata);
icraggs 1:7fa362fa563f 52 topicFilter->data.short_name[1] = MQTTSNPacket_readChar(&curdata);
icraggs 1:7fa362fa563f 53 }
icraggs 1:7fa362fa563f 54
icraggs 1:7fa362fa563f 55 rc = 1;
icraggs 1:7fa362fa563f 56 exit:
icraggs 1:7fa362fa563f 57 FUNC_EXIT_RC(rc);
icraggs 1:7fa362fa563f 58 return rc;
icraggs 1:7fa362fa563f 59 }
icraggs 1:7fa362fa563f 60
icraggs 1:7fa362fa563f 61
icraggs 1:7fa362fa563f 62 int MQTTSNSerialize_unsuback(unsigned char* buf, int buflen, unsigned short packetid)
icraggs 1:7fa362fa563f 63 {
icraggs 1:7fa362fa563f 64 unsigned char *ptr = buf;
icraggs 1:7fa362fa563f 65 int len = 0;
icraggs 1:7fa362fa563f 66 int rc = 0;
icraggs 1:7fa362fa563f 67
icraggs 1:7fa362fa563f 68 FUNC_ENTRY;
icraggs 1:7fa362fa563f 69 if ((len = MQTTSNPacket_len(7)) > buflen)
icraggs 1:7fa362fa563f 70 {
icraggs 1:7fa362fa563f 71 rc = MQTTSNPACKET_BUFFER_TOO_SHORT;
icraggs 1:7fa362fa563f 72 goto exit;
icraggs 1:7fa362fa563f 73 }
icraggs 1:7fa362fa563f 74 ptr += MQTTSNPacket_encode(ptr, len); /* write length */
icraggs 1:7fa362fa563f 75 MQTTSNPacket_writeChar(&ptr, MQTTSN_UNSUBACK); /* write message type */
icraggs 1:7fa362fa563f 76
icraggs 1:7fa362fa563f 77 MQTTSNPacket_writeInt(&ptr, packetid);
icraggs 1:7fa362fa563f 78
icraggs 1:7fa362fa563f 79 rc = ptr - buf;
icraggs 1:7fa362fa563f 80 exit:
icraggs 1:7fa362fa563f 81 FUNC_EXIT_RC(rc);
icraggs 1:7fa362fa563f 82 return rc;
icraggs 1:7fa362fa563f 83 }
icraggs 1:7fa362fa563f 84
icraggs 1:7fa362fa563f 85
icraggs 1:7fa362fa563f 86