mirror of
https://github.com/cwyark/sdk-ameba-v4.0b_without_nda_gcc.git
synced 2024-11-25 23:44:21 +00:00
100 lines
3 KiB
C
100 lines
3 KiB
C
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/*******************************************************************************
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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 "MQTTPacket.h"
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#include "StackTrace.h"
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#include <string.h>
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/**
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* Deserializes the supplied (wire) buffer into unsubscribe data
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* @param dup integer returned - the MQTT dup flag
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* @param packetid integer returned - the MQTT packet identifier
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* @param maxcount - the maximum number of members allowed in the topicFilters and requestedQoSs arrays
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* @param count - number of members in the topicFilters and requestedQoSs arrays
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* @param topicFilters - array of topic filter names
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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 the length of the serialized data. <= 0 indicates error
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*/
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int MQTTDeserialize_unsubscribe(unsigned char* dup, unsigned short* packetid, int maxcount, int* count, MQTTString topicFilters[],
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unsigned char* buf, int len)
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{
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MQTTHeader header = {0};
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unsigned char* curdata = buf;
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unsigned char* enddata = NULL;
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int rc = 0;
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int mylen = 0;
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FUNC_ENTRY;
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header.byte = readChar(&curdata);
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if (header.bits.type != UNSUBSCRIBE)
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goto exit;
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*dup = header.bits.dup;
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curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
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enddata = curdata + mylen;
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*packetid = readInt(&curdata);
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*count = 0;
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while (curdata < enddata)
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{
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if (!readMQTTLenString(&topicFilters[*count], &curdata, enddata))
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goto exit;
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(*count)++;
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}
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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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* Serializes the supplied unsuback data into the supplied buffer, ready for sending
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* @param buf the buffer into which the packet will be serialized
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* @param buflen the length in bytes of the supplied buffer
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* @param packetid integer - the MQTT packet identifier
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* @return the length of the serialized data. <= 0 indicates error
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*/
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int MQTTSerialize_unsuback(unsigned char* buf, int buflen, unsigned short packetid)
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{
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MQTTHeader header = {0};
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int rc = 0;
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unsigned char *ptr = buf;
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FUNC_ENTRY;
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if (buflen < 2)
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{
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rc = MQTTPACKET_BUFFER_TOO_SHORT;
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goto exit;
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}
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header.byte = 0;
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header.bits.type = UNSUBACK;
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writeChar(&ptr, header.byte); /* write header */
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ptr += MQTTPacket_encode(ptr, 2); /* write remaining length */
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writeInt(&ptr, packetid);
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rc = ptr - buf;
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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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