Vergil Cola / Mbed OS MQTTGateway2

Fork of my original MQTTGateway

Dependencies:   mbed-http

MQTTSManager/MQTTPacket/MQTTDeserializePublish.c@0:a1734fe1ec4b, 2017-04-08 (annotated)

Committer:
vpcola
Date:
Sat Apr 08 14:43:14 2017 +0000
Revision:
0:a1734fe1ec4b
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vpcola 0:a1734fe1ec4b 1 /*******************************************************************************
vpcola 0:a1734fe1ec4b 2 * Copyright (c) 2014 IBM Corp.
vpcola 0:a1734fe1ec4b 3 *
vpcola 0:a1734fe1ec4b 4 * All rights reserved. This program and the accompanying materials
vpcola 0:a1734fe1ec4b 5 * are made available under the terms of the Eclipse Public License v1.0
vpcola 0:a1734fe1ec4b 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
vpcola 0:a1734fe1ec4b 7 *
vpcola 0:a1734fe1ec4b 8 * The Eclipse Public License is available at
vpcola 0:a1734fe1ec4b 9 * http://www.eclipse.org/legal/epl-v10.html
vpcola 0:a1734fe1ec4b 10 * and the Eclipse Distribution License is available at
vpcola 0:a1734fe1ec4b 11 * http://www.eclipse.org/org/documents/edl-v10.php.
vpcola 0:a1734fe1ec4b 12 *
vpcola 0:a1734fe1ec4b 13 * Contributors:
vpcola 0:a1734fe1ec4b 14 * Ian Craggs - initial API and implementation and/or initial documentation
vpcola 0:a1734fe1ec4b 15 *******************************************************************************/
vpcola 0:a1734fe1ec4b 16
vpcola 0:a1734fe1ec4b 17 #include "StackTrace.h"
vpcola 0:a1734fe1ec4b 18 #include "MQTTPacket.h"
vpcola 0:a1734fe1ec4b 19 #include <string.h>
vpcola 0:a1734fe1ec4b 20
vpcola 0:a1734fe1ec4b 21 #define min(a, b) ((a < b) ? 1 : 0)
vpcola 0:a1734fe1ec4b 22
vpcola 0:a1734fe1ec4b 23 /**
vpcola 0:a1734fe1ec4b 24 * Deserializes the supplied (wire) buffer into publish data
vpcola 0:a1734fe1ec4b 25 * @param dup returned integer - the MQTT dup flag
vpcola 0:a1734fe1ec4b 26 * @param qos returned integer - the MQTT QoS value
vpcola 0:a1734fe1ec4b 27 * @param retained returned integer - the MQTT retained flag
vpcola 0:a1734fe1ec4b 28 * @param packetid returned integer - the MQTT packet identifier
vpcola 0:a1734fe1ec4b 29 * @param topicName returned MQTTString - the MQTT topic in the publish
vpcola 0:a1734fe1ec4b 30 * @param payload returned byte buffer - the MQTT publish payload
vpcola 0:a1734fe1ec4b 31 * @param payloadlen returned integer - the length of the MQTT payload
vpcola 0:a1734fe1ec4b 32 * @param buf the raw buffer data, of the correct length determined by the remaining length field
vpcola 0:a1734fe1ec4b 33 * @param buflen the length in bytes of the data in the supplied buffer
vpcola 0:a1734fe1ec4b 34 * @return error code. 1 is success
vpcola 0:a1734fe1ec4b 35 */
vpcola 0:a1734fe1ec4b 36 int MQTTDeserialize_publish(unsigned char* dup, int* qos, unsigned char* retained, unsigned short* packetid, MQTTString* topicName,
vpcola 0:a1734fe1ec4b 37 unsigned char** payload, int* payloadlen, unsigned char* buf, int buflen)
vpcola 0:a1734fe1ec4b 38 {
vpcola 0:a1734fe1ec4b 39 MQTTHeader header = {0};
vpcola 0:a1734fe1ec4b 40 unsigned char* curdata = buf;
vpcola 0:a1734fe1ec4b 41 unsigned char* enddata = NULL;
vpcola 0:a1734fe1ec4b 42 int rc = 0;
vpcola 0:a1734fe1ec4b 43 int mylen = 0;
vpcola 0:a1734fe1ec4b 44
vpcola 0:a1734fe1ec4b 45 FUNC_ENTRY;
vpcola 0:a1734fe1ec4b 46 header.byte = readChar(&curdata);
vpcola 0:a1734fe1ec4b 47 if (header.bits.type != PUBLISH)
vpcola 0:a1734fe1ec4b 48 goto exit;
vpcola 0:a1734fe1ec4b 49 *dup = header.bits.dup;
vpcola 0:a1734fe1ec4b 50 *qos = header.bits.qos;
vpcola 0:a1734fe1ec4b 51 *retained = header.bits.retain;
vpcola 0:a1734fe1ec4b 52
vpcola 0:a1734fe1ec4b 53 curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
vpcola 0:a1734fe1ec4b 54 enddata = curdata + mylen;
vpcola 0:a1734fe1ec4b 55
vpcola 0:a1734fe1ec4b 56 if (!readMQTTLenString(topicName, &curdata, enddata) ||
vpcola 0:a1734fe1ec4b 57 enddata - curdata < 0) /* do we have enough data to read the protocol version byte? */
vpcola 0:a1734fe1ec4b 58 goto exit;
vpcola 0:a1734fe1ec4b 59
vpcola 0:a1734fe1ec4b 60 if (*qos > 0)
vpcola 0:a1734fe1ec4b 61 *packetid = readInt(&curdata);
vpcola 0:a1734fe1ec4b 62
vpcola 0:a1734fe1ec4b 63 *payloadlen = enddata - curdata;
vpcola 0:a1734fe1ec4b 64 *payload = curdata;
vpcola 0:a1734fe1ec4b 65 rc = 1;
vpcola 0:a1734fe1ec4b 66 exit:
vpcola 0:a1734fe1ec4b 67 FUNC_EXIT_RC(rc);
vpcola 0:a1734fe1ec4b 68 return rc;
vpcola 0:a1734fe1ec4b 69 }
vpcola 0:a1734fe1ec4b 70
vpcola 0:a1734fe1ec4b 71
vpcola 0:a1734fe1ec4b 72
vpcola 0:a1734fe1ec4b 73 /**
vpcola 0:a1734fe1ec4b 74 * Deserializes the supplied (wire) buffer into an ack
vpcola 0:a1734fe1ec4b 75 * @param packettype returned integer - the MQTT packet type
vpcola 0:a1734fe1ec4b 76 * @param dup returned integer - the MQTT dup flag
vpcola 0:a1734fe1ec4b 77 * @param packetid returned integer - the MQTT packet identifier
vpcola 0:a1734fe1ec4b 78 * @param buf the raw buffer data, of the correct length determined by the remaining length field
vpcola 0:a1734fe1ec4b 79 * @param buflen the length in bytes of the data in the supplied buffer
vpcola 0:a1734fe1ec4b 80 * @return error code. 1 is success, 0 is failure
vpcola 0:a1734fe1ec4b 81 */
vpcola 0:a1734fe1ec4b 82 int MQTTDeserialize_ack(unsigned char* packettype, unsigned char* dup, unsigned short* packetid, unsigned char* buf, int buflen)
vpcola 0:a1734fe1ec4b 83 {
vpcola 0:a1734fe1ec4b 84 MQTTHeader header = {0};
vpcola 0:a1734fe1ec4b 85 unsigned char* curdata = buf;
vpcola 0:a1734fe1ec4b 86 unsigned char* enddata = NULL;
vpcola 0:a1734fe1ec4b 87 int rc = 0;
vpcola 0:a1734fe1ec4b 88 int mylen;
vpcola 0:a1734fe1ec4b 89
vpcola 0:a1734fe1ec4b 90 FUNC_ENTRY;
vpcola 0:a1734fe1ec4b 91 header.byte = readChar(&curdata);
vpcola 0:a1734fe1ec4b 92 *dup = header.bits.dup;
vpcola 0:a1734fe1ec4b 93 *packettype = header.bits.type;
vpcola 0:a1734fe1ec4b 94
vpcola 0:a1734fe1ec4b 95 curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
vpcola 0:a1734fe1ec4b 96 enddata = curdata + mylen;
vpcola 0:a1734fe1ec4b 97
vpcola 0:a1734fe1ec4b 98 if (enddata - curdata < 2)
vpcola 0:a1734fe1ec4b 99 goto exit;
vpcola 0:a1734fe1ec4b 100 *packetid = readInt(&curdata);
vpcola 0:a1734fe1ec4b 101
vpcola 0:a1734fe1ec4b 102 rc = 1;
vpcola 0:a1734fe1ec4b 103 exit:
vpcola 0:a1734fe1ec4b 104 FUNC_EXIT_RC(rc);
vpcola 0:a1734fe1ec4b 105 return rc;
vpcola 0:a1734fe1ec4b 106 }
vpcola 0:a1734fe1ec4b 107