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 subscribe 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 requestedQoSs - array of requested QoS
31 * @param buf the raw buffer data, of the correct length determined by the remaining length field
32 * @param buflen the length in bytes of the data in the supplied buffer
33 * @return the length of the serialized data. <= 0 indicates error
34 */
MQTTDeserialize_subscribe(unsigned char * dup,unsigned short * packetid,int maxcount,int * count,MQTTString topicFilters[],int requestedQoSs[],unsigned char * buf,int buflen)35 int MQTTDeserialize_subscribe(unsigned char* dup, unsigned short* packetid, int maxcount, int* count, MQTTString topicFilters[],
36 int requestedQoSs[], unsigned char* buf, int buflen)
37 {
38 MQTTHeader header = {0};
39 unsigned char* curdata = buf;
40 unsigned char* enddata = NULL;
41 int rc = -1;
42 int mylen = 0;
43
44 FUNC_ENTRY;
45 header.byte = readChar(&curdata);
46 if (header.bits.type != SUBSCRIBE)
47 goto exit;
48 *dup = header.bits.dup;
49
50 curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
51 enddata = curdata + mylen;
52
53 *packetid = readInt(&curdata);
54
55 *count = 0;
56 while (curdata < enddata)
57 {
58 if (!readMQTTLenString(&topicFilters[*count], &curdata, enddata))
59 goto exit;
60 if (curdata >= enddata) /* do we have enough data to read the req_qos version byte? */
61 goto exit;
62 requestedQoSs[*count] = readChar(&curdata);
63 (*count)++;
64 }
65
66 rc = 1;
67 exit:
68 FUNC_EXIT_RC(rc);
69 return rc;
70 }
71
72
73 /**
74 * Serializes the supplied suback data into the supplied buffer, ready for sending
75 * @param buf the buffer into which the packet will be serialized
76 * @param buflen the length in bytes of the supplied buffer
77 * @param packetid integer - the MQTT packet identifier
78 * @param count - number of members in the grantedQoSs array
79 * @param grantedQoSs - array of granted QoS
80 * @return the length of the serialized data. <= 0 indicates error
81 */
MQTTSerialize_suback(unsigned char * buf,int buflen,unsigned short packetid,int count,int * grantedQoSs)82 int MQTTSerialize_suback(unsigned char* buf, int buflen, unsigned short packetid, int count, int* grantedQoSs)
83 {
84 MQTTHeader header = {0};
85 int rc = -1;
86 unsigned char *ptr = buf;
87 int i;
88
89 FUNC_ENTRY;
90 if (buflen < 2 + count)
91 {
92 rc = MQTTPACKET_BUFFER_TOO_SHORT;
93 goto exit;
94 }
95 header.byte = 0;
96 header.bits.type = SUBACK;
97 writeChar(&ptr, header.byte); /* write header */
98
99 ptr += MQTTPacket_encode(ptr, 2 + count); /* write remaining length */
100
101 writeInt(&ptr, packetid);
102
103 for (i = 0; i < count; ++i)
104 writeChar(&ptr, grantedQoSs[i]);
105
106 rc = ptr - buf;
107 exit:
108 FUNC_EXIT_RC(rc);
109 return rc;
110 }
111
112
113