mirror of
https://github.com/eclipse/paho.mqtt-sn.embedded-c.git
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5c278f1aec
error occurs. Do not store the length of packet into rc. If the packet is incorrect, skip the processing that follows. Bugfix: Print out the value of TopicId in SUBACK and UNSUBACK. Signed-off-by: tomoaki <tomoaki@tomy-tech.com>
118 lines
3.3 KiB
C
118 lines
3.3 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 "MQTTSNPacket.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 MQTTSN subscribe packet that would be produced using the supplied parameters,
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* excluding length
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* @param topicName the topic name 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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int MQTTSNSerialize_unsubscribeLength(MQTTSN_topicid* topicFilter)
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{
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int len = 4;
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if (topicFilter->type == MQTTSN_TOPIC_TYPE_NORMAL)
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len += topicFilter->data.long_.len;
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else if (topicFilter->type == MQTTSN_TOPIC_TYPE_SHORT || topicFilter->type == MQTTSN_TOPIC_TYPE_PREDEFINED)
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len += 2;
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return len;
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}
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int MQTTSNSerialize_unsubscribe(unsigned char* buf, int buflen, unsigned short packetid, MQTTSN_topicid* topicFilter)
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{
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unsigned char *ptr = buf;
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MQTTSNFlags flags;
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int len = 0;
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int rc = 0;
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FUNC_ENTRY;
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if ((len = MQTTSNPacket_len(MQTTSNSerialize_unsubscribeLength(topicFilter))) > buflen)
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{
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rc = MQTTSNPACKET_BUFFER_TOO_SHORT;
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goto exit;
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}
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ptr += MQTTSNPacket_encode(ptr, len); /* write length */
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writeChar(&ptr, MQTTSN_UNSUBSCRIBE); /* write message type */
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flags.all = 0;
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flags.bits.topicIdType = topicFilter->type;
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writeChar(&ptr, flags.all);
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writeInt(&ptr, packetid);
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/* now the topic id or name */
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if (topicFilter->type == MQTTSN_TOPIC_TYPE_NORMAL) /* means long topic name */
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{
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memcpy(ptr, topicFilter->data.long_.name, topicFilter->data.long_.len);
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ptr += topicFilter->data.long_.len;
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}
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else if (topicFilter->type == MQTTSN_TOPIC_TYPE_PREDEFINED)
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writeInt(&ptr, topicFilter->data.id);
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else if (topicFilter->type == MQTTSN_TOPIC_TYPE_SHORT)
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{
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writeChar(&ptr, topicFilter->data.short_name[0]);
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writeChar(&ptr, topicFilter->data.short_name[1]);
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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 unsuback data
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* @param packetid returned - the same value as the one contained in the corresponding SUBSCRIBE
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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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int MQTTSNDeserialize_unsuback(unsigned short* packetid, unsigned char* buf, int buflen)
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{
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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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curdata += MQTTSNPacket_decode(curdata, buflen, &mylen); /* read length */
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enddata = buf + mylen;
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if (enddata - curdata > buflen)
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goto exit;
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if (readChar(&curdata) != MQTTSN_UNSUBACK)
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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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