mirror of
https://github.com/eclipse/paho.mqtt-sn.embedded-c.git
synced 2025-12-14 07:56:52 +01:00
Move MQTTSNPacket into subdirectory
This commit is contained in:
Ian Craggs
225
MQTTSNPacket/src/MQTTSNDeserializePublish.c
Normal file
225
MQTTSNPacket/src/MQTTSNDeserializePublish.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 "StackTrace.h"
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#include "MQTTSNPacket.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 MQTTSNString - 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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int MQTTSNDeserialize_publish(unsigned char* dup, int* qos, unsigned char* retained, unsigned short* packetid, MQTTSN_topicid* topic,
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unsigned char** payload, int* payloadlen, unsigned char* buf, int buflen)
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{
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MQTTSNFlags flags;
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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 += (rc = 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_PUBLISH)
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goto exit;
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flags.all = readChar(&curdata);
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*dup = flags.bits.dup;
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*qos = flags.bits.QoS;
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*retained = flags.bits.retain;
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topic->type = flags.bits.topicIdType;
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if (topic->type == MQTTSN_TOPIC_TYPE_NORMAL && *qos == 3)
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{
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/* special arrangement for long topic names in QoS -1 publishes. The length of the topic is in the topicid field */
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topic->data.long_.len = readInt(&curdata);
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}
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else if (topic->type == MQTTSN_TOPIC_TYPE_NORMAL || topic->type == MQTTSN_TOPIC_TYPE_PREDEFINED)
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topic->data.id = readInt(&curdata);
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else
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{
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topic->data.short_name[0] = readChar(&curdata);
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topic->data.short_name[1] = readChar(&curdata);
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}
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*packetid = readInt(&curdata);
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if (topic->type == MQTTSN_TOPIC_TYPE_NORMAL && *qos == 3)
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{
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topic->data.long_.name = (char*)curdata;
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curdata += topic->data.long_.len;
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}
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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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int MQTTSNDeserialize_puback(unsigned short* topicid, unsigned short* packetid,
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unsigned char* returncode, 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 += (rc = 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_PUBACK)
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goto exit;
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*topicid = readInt(&curdata);
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*packetid = readInt(&curdata);
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*returncode = readChar(&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 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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int MQTTSNDeserialize_ack(unsigned char* type, 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 += (rc = 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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*type = readChar(&curdata);
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if (*type != MQTTSN_PUBREL && *type != MQTTSN_PUBREC && *type != MQTTSN_PUBCOMP)
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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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/**
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* Deserializes the supplied (wire) buffer into register data
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* @param topicid returned topic id
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* @param packetid returned integer - the MQTT packet identifier
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* @param topicName returned MQTTSNString - the MQTT topic in the register
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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_register(unsigned short* topicid, unsigned short* packetid, MQTTSNString* topicname,
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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 += (rc = 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_REGISTER)
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goto exit;
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*topicid = readInt(&curdata);
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*packetid = readInt(&curdata);
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topicname->lenstring.data = (char*)curdata;
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topicname->lenstring.len = enddata - curdata;
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topicname->cstring = NULL;
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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 register data
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* @param topicid returned topic id
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* @param packetid returned integer - the MQTT packet identifier
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* @param return_code returned integer return code
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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_regack(unsigned short* topicid, unsigned short* packetid, unsigned char* return_code,
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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 += (rc = 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_REGACK)
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goto exit;
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*topicid = readInt(&curdata);
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*packetid = readInt(&curdata);
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*return_code = readChar(&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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