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