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110 lines
3.5 KiB
C
110 lines
3.5 KiB
C
/*******************************************************************************
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* Copyright (c) 2014 IBM Corp.
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*
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* and Eclipse Distribution License v1.0 which accompany this distribution.
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*
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* The Eclipse Public License is available at
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* http://www.eclipse.org/legal/epl-v10.html
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* and the Eclipse Distribution License is available at
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* http://www.eclipse.org/org/documents/edl-v10.php.
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*
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* Contributors:
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* Ian Craggs - initial API and implementation and/or initial documentation
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*******************************************************************************/
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#include "StackTrace.h"
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#include "MQTTPacket.h"
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#include <string.h>
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#define min(a, b) ((a < b) ? 1 : 0)
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/**
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* Deserializes the supplied (wire) buffer into publish data
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* @param dup returned integer - the MQTT dup flag
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* @param qos returned integer - the MQTT QoS value
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* @param retained returned integer - the MQTT retained flag
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* @param packetid returned integer - the MQTT packet identifier
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* @param topicName returned MQTTString - the MQTT topic in the publish
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* @param payload returned byte buffer - the MQTT publish payload
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* @param payloadlen returned integer - the length of the MQTT payload
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* @param buf the raw buffer data, of the correct length determined by the remaining length field
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* @param buflen the length in bytes of the data in the supplied buffer
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* @return error code. 1 is success
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*/
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int32_t MQTTDeserialize_publish(uint8_t* dup, uint8_t* qos, uint8_t* retained, uint16_t* packetid, MQTTString* topicName,
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uint8_t** payload, int32_t* payloadlen, uint8_t* buf, int32_t buflen)
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{
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MQTTHeader header = {0};
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uint8_t* curdata = buf;
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uint8_t* enddata = NULL;
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int32_t rc = 0;
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int32_t mylen = 0;
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FUNC_ENTRY;
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header.byte = readChar(&curdata);
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if (header.bits.type != PUBLISH)
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goto exit;
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*dup = header.bits.dup;
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*qos = header.bits.qos;
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*retained = header.bits.retain;
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curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
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enddata = curdata + mylen;
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/* do we have enough data to read the protocol version byte? */
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if (!readMQTTLenString(topicName, &curdata, enddata) || enddata - curdata < 0)
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goto exit;
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if (*qos > 0)
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*packetid = readInt(&curdata);
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*payloadlen = enddata - curdata;
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*payload = curdata;
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rc = 1;
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exit:
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FUNC_EXIT_RC(rc);
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return rc;
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}
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/**
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* Deserializes the supplied (wire) buffer into an ack
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* @param packettype returned integer - the MQTT packet type
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* @param dup returned integer - the MQTT dup flag
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* @param packetid returned integer - the MQTT packet identifier
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* @param buf the raw buffer data, of the correct length determined by the remaining length field
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* @param buflen the length in bytes of the data in the supplied buffer
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* @return error code. 1 is success, 0 is failure
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*/
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int32_t MQTTDeserialize_ack(uint8_t* packettype, uint8_t* dup, uint16_t* packetid, uint8_t* buf, int32_t buflen)
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{
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MQTTHeader header = {0};
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uint8_t* curdata = buf;
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uint8_t* enddata = NULL;
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int32_t rc = 0;
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int32_t mylen;
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FUNC_ENTRY;
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header.byte = readChar(&curdata);
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*dup = header.bits.dup;
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*packettype = header.bits.type;
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curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
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enddata = curdata + mylen;
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if (enddata - curdata < 2)
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goto exit;
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*packetid = readInt(&curdata);
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rc = 1;
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exit:
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FUNC_EXIT_RC(rc);
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return rc;
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}
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