OneM2M / MQTTSNPacket

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MQTTSNUnsubscribeClient.c@0:c524a894b5e8, 2015-02-26 (annotated)

Committer:
icraggs
Date:
Thu Feb 26 15:59:36 2015 +0000
Revision:
0:c524a894b5e8
Child:
1:7fa362fa563f
First version that works nicely :-)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
icraggs 0:c524a894b5e8 1 /*******************************************************************************
icraggs 0:c524a894b5e8 2 * Copyright (c) 2014 IBM Corp.
icraggs 0:c524a894b5e8 3 *
icraggs 0:c524a894b5e8 4 * All rights reserved. This program and the accompanying materials
icraggs 0:c524a894b5e8 5 * are made available under the terms of the Eclipse Public License v1.0
icraggs 0:c524a894b5e8 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
icraggs 0:c524a894b5e8 7 *
icraggs 0:c524a894b5e8 8 * The Eclipse Public License is available at
icraggs 0:c524a894b5e8 9 * http://www.eclipse.org/legal/epl-v10.html
icraggs 0:c524a894b5e8 10 * and the Eclipse Distribution License is available at
icraggs 0:c524a894b5e8 11 * http://www.eclipse.org/org/documents/edl-v10.php.
icraggs 0:c524a894b5e8 12 *
icraggs 0:c524a894b5e8 13 * Contributors:
icraggs 0:c524a894b5e8 14 * Ian Craggs - initial API and implementation and/or initial documentation
icraggs 0:c524a894b5e8 15 *******************************************************************************/
icraggs 0:c524a894b5e8 16
icraggs 0:c524a894b5e8 17 #include "MQTTSNPacket.h"
icraggs 0:c524a894b5e8 18 #include "StackTrace.h"
icraggs 0:c524a894b5e8 19
icraggs 0:c524a894b5e8 20 #include <string.h>
icraggs 0:c524a894b5e8 21
icraggs 0:c524a894b5e8 22 /**
icraggs 0:c524a894b5e8 23 * Determines the length of the MQTTSN subscribe packet that would be produced using the supplied parameters,
icraggs 0:c524a894b5e8 24 * excluding length
icraggs 0:c524a894b5e8 25 * @param topicName the topic name to be used in the publish
icraggs 0:c524a894b5e8 26 * @return the length of buffer needed to contain the serialized version of the packet
icraggs 0:c524a894b5e8 27 */
icraggs 0:c524a894b5e8 28 int MQTTSNSerialize_unsubscribeLength(MQTTSN_topicid* topicFilter)
icraggs 0:c524a894b5e8 29 {
icraggs 0:c524a894b5e8 30 int len = 4;
icraggs 0:c524a894b5e8 31
icraggs 0:c524a894b5e8 32 if (topicFilter->type == MQTTSN_TOPIC_TYPE_NORMAL)
icraggs 0:c524a894b5e8 33 len += topicFilter->data.long_.len;
icraggs 0:c524a894b5e8 34 else if (topicFilter->type == MQTTSN_TOPIC_TYPE_SHORT || topicFilter->type == MQTTSN_TOPIC_TYPE_PREDEFINED)
icraggs 0:c524a894b5e8 35 len += 2;
icraggs 0:c524a894b5e8 36
icraggs 0:c524a894b5e8 37 return len;
icraggs 0:c524a894b5e8 38 }
icraggs 0:c524a894b5e8 39
icraggs 0:c524a894b5e8 40
icraggs 0:c524a894b5e8 41 int MQTTSNSerialize_unsubscribe(unsigned char* buf, int buflen, unsigned short packetid, MQTTSN_topicid* topicFilter)
icraggs 0:c524a894b5e8 42 {
icraggs 0:c524a894b5e8 43 unsigned char *ptr = buf;
icraggs 0:c524a894b5e8 44 MQTTSNFlags flags;
icraggs 0:c524a894b5e8 45 int len = 0;
icraggs 0:c524a894b5e8 46 int rc = 0;
icraggs 0:c524a894b5e8 47
icraggs 0:c524a894b5e8 48 FUNC_ENTRY;
icraggs 0:c524a894b5e8 49 if ((len = MQTTSNPacket_len(MQTTSNSerialize_unsubscribeLength(topicFilter))) > buflen)
icraggs 0:c524a894b5e8 50 {
icraggs 0:c524a894b5e8 51 rc = MQTTSNPACKET_BUFFER_TOO_SHORT;
icraggs 0:c524a894b5e8 52 goto exit;
icraggs 0:c524a894b5e8 53 }
icraggs 0:c524a894b5e8 54 ptr += MQTTSNPacket_encode(ptr, len); /* write length */
icraggs 0:c524a894b5e8 55 writeChar(&ptr, MQTTSN_UNSUBSCRIBE); /* write message type */
icraggs 0:c524a894b5e8 56
icraggs 0:c524a894b5e8 57 flags.all = 0;
icraggs 0:c524a894b5e8 58 flags.bits.topicIdType = topicFilter->type;
icraggs 0:c524a894b5e8 59 writeChar(&ptr, flags.all);
icraggs 0:c524a894b5e8 60
icraggs 0:c524a894b5e8 61 writeInt(&ptr, packetid);
icraggs 0:c524a894b5e8 62
icraggs 0:c524a894b5e8 63 /* now the topic id or name */
icraggs 0:c524a894b5e8 64 if (topicFilter->type == MQTTSN_TOPIC_TYPE_NORMAL) /* means long topic name */
icraggs 0:c524a894b5e8 65 {
icraggs 0:c524a894b5e8 66 memcpy(ptr, topicFilter->data.long_.name, topicFilter->data.long_.len);
icraggs 0:c524a894b5e8 67 ptr += topicFilter->data.long_.len;
icraggs 0:c524a894b5e8 68 }
icraggs 0:c524a894b5e8 69 else if (topicFilter->type == MQTTSN_TOPIC_TYPE_PREDEFINED)
icraggs 0:c524a894b5e8 70 writeInt(&ptr, topicFilter->data.id);
icraggs 0:c524a894b5e8 71 else if (topicFilter->type == MQTTSN_TOPIC_TYPE_SHORT)
icraggs 0:c524a894b5e8 72 {
icraggs 0:c524a894b5e8 73 writeChar(&ptr, topicFilter->data.short_name[0]);
icraggs 0:c524a894b5e8 74 writeChar(&ptr, topicFilter->data.short_name[1]);
icraggs 0:c524a894b5e8 75 }
icraggs 0:c524a894b5e8 76
icraggs 0:c524a894b5e8 77 rc = ptr - buf;
icraggs 0:c524a894b5e8 78 exit:
icraggs 0:c524a894b5e8 79 FUNC_EXIT_RC(rc);
icraggs 0:c524a894b5e8 80 return rc;
icraggs 0:c524a894b5e8 81
icraggs 0:c524a894b5e8 82 }
icraggs 0:c524a894b5e8 83
icraggs 0:c524a894b5e8 84
icraggs 0:c524a894b5e8 85 /**
icraggs 0:c524a894b5e8 86 * Deserializes the supplied (wire) buffer into unsuback data
icraggs 0:c524a894b5e8 87 * @param packetid returned - the same value as the one contained in the corresponding SUBSCRIBE
icraggs 0:c524a894b5e8 88 * @param buf the raw buffer data, of the correct length determined by the remaining length field
icraggs 0:c524a894b5e8 89 * @param buflen the length in bytes of the data in the supplied buffer
icraggs 0:c524a894b5e8 90 * @return error code. 1 is success
icraggs 0:c524a894b5e8 91 */
icraggs 0:c524a894b5e8 92 int MQTTSNDeserialize_unsuback(unsigned short* packetid, unsigned char* buf, int buflen)
icraggs 0:c524a894b5e8 93 {
icraggs 0:c524a894b5e8 94 unsigned char* curdata = buf;
icraggs 0:c524a894b5e8 95 unsigned char* enddata = NULL;
icraggs 0:c524a894b5e8 96 int rc = 0;
icraggs 0:c524a894b5e8 97 int mylen = 0;
icraggs 0:c524a894b5e8 98
icraggs 0:c524a894b5e8 99 FUNC_ENTRY;
icraggs 0:c524a894b5e8 100 curdata += (rc = MQTTSNPacket_decode(curdata, buflen, &mylen)); /* read length */
icraggs 0:c524a894b5e8 101 enddata = buf + mylen;
icraggs 0:c524a894b5e8 102 if (enddata - curdata > buflen)
icraggs 0:c524a894b5e8 103 goto exit;
icraggs 0:c524a894b5e8 104
icraggs 0:c524a894b5e8 105 if (readChar(&curdata) != MQTTSN_UNSUBACK)
icraggs 0:c524a894b5e8 106 goto exit;
icraggs 0:c524a894b5e8 107
icraggs 0:c524a894b5e8 108 *packetid = readInt(&curdata);
icraggs 0:c524a894b5e8 109
icraggs 0:c524a894b5e8 110 rc = 1;
icraggs 0:c524a894b5e8 111 exit:
icraggs 0:c524a894b5e8 112 FUNC_EXIT_RC(rc);
icraggs 0:c524a894b5e8 113 return rc;
icraggs 0:c524a894b5e8 114 }
icraggs 0:c524a894b5e8 115
icraggs 0:c524a894b5e8 116
icraggs 0:c524a894b5e8 117
icraggs 0:c524a894b5e8 118