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141 lines
4.1 KiB
C
141 lines
4.1 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 "MQTTPacket.h"
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#include "StackTrace.h"
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#include <string.h>
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/**
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* Determines the length of the MQTT subscribe packet that would be produced using the supplied parameters
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* @param count the number of topic filter strings in topicFilters
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* @param topicFilters the array of topic filter strings to be used in the publish
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* @return the length of buffer needed to contain the serialized version of the packet
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*/
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int32_t MQTTSerialize_subscribeLength(int32_t count, MQTTString topicFilters[])
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{
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int32_t len = 2; /* packetid */
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for (int32_t i = 0; i < count; ++i)
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len += 2 + MQTTstrlen(topicFilters[i]) + 1; /* length + topic + req_qos */
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return len;
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}
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/**
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* Serializes the supplied subscribe 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 bufferr
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* @param dup integer - the MQTT dup flag
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* @param packetid integer - the MQTT packet identifier
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* @param count - number of members in the topicFilters and reqQos arrays
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* @param topicFilters - array of topic filter names
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* @param requestedQoSs - array of requested QoS
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* @return the length of the serialized data. <= 0 indicates error
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*/
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int32_t MQTTSerialize_subscribe(uint8_t* buf, int32_t buflen, uint8_t dup, uint16_t packetid, int32_t count,
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MQTTString topicFilters[], int32_t requestedQoSs[])
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{
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uint8_t *ptr = buf;
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MQTTHeader header = {0};
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int32_t rem_len = 0;
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int32_t rc = 0;
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FUNC_ENTRY;
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if (MQTTPacket_len(rem_len = MQTTSerialize_subscribeLength(count, topicFilters)) > buflen)
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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 = SUBSCRIBE;
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header.bits.dup = dup;
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header.bits.qos = 1;
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writeChar(&ptr, header.byte); /* write header */
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ptr += MQTTPacket_encode(ptr, rem_len); /* write remaining length */;
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writeInt(&ptr, packetid);
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for (int32_t i = 0; i < count; ++i)
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{
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writeMQTTString(&ptr, topicFilters[i]);
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writeChar(&ptr, requestedQoSs[i]);
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}
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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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/**
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* Deserializes the supplied (wire) buffer into suback data
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* @param packetid returned integer - the MQTT packet identifier
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* @param maxcount - the maximum number of members allowed in the grantedQoSs array
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* @param count returned integer - number of members in the grantedQoSs array
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* @param grantedQoSs returned array of integers - the granted qualities of service
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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_suback(uint16_t* packetid, int32_t maxcount, int32_t* count, int32_t grantedQoSs[], 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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if (header.bits.type != SUBACK)
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goto exit;
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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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*count = 0;
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while (curdata < enddata)
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{
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if (*count > maxcount)
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{
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rc = -1;
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goto exit;
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}
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grantedQoSs[(*count)++] = readChar(&curdata);
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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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