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Diff: MQTTSNSearchClient.c
- Revision:
- 0:c524a894b5e8
- Child:
- 1:7fa362fa563f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MQTTSNSearchClient.c Thu Feb 26 15:59:36 2015 +0000 @@ -0,0 +1,127 @@ +/******************************************************************************* + * Copyright (c) 2014 IBM Corp. + * + * All rights reserved. This program and the accompanying materials + * are made available under the terms of the Eclipse Public License v1.0 + * and Eclipse Distribution License v1.0 which accompany this distribution. + * + * The Eclipse Public License is available at + * http://www.eclipse.org/legal/epl-v10.html + * and the Eclipse Distribution License is available at + * http://www.eclipse.org/org/documents/edl-v10.php. + * + * Contributors: + * Ian Craggs - initial API and implementation and/or initial documentation + *******************************************************************************/ + +#include "MQTTSNPacket.h" +#include "StackTrace.h" + +#include <string.h> + + +/** + * Deserializes the supplied (wire) buffer into advertise data + * @param gatewayid the returned gateway id + * @param duration the returned duration - the time interval until the next advertise will be sent + * @param buf the raw buffer data, of the correct length determined by the remaining length field + * @param buflen the length in bytes of the data in the supplied buffer + * @return error code. 1 is success + */ +int MQTTSNDeserialize_advertise(unsigned char* gatewayid, unsigned short* duration, unsigned char* buf, int buflen) +{ + unsigned char* curdata = buf; + unsigned char* enddata = NULL; + int rc = 0; + int mylen = 0; + + FUNC_ENTRY; + curdata += (rc = MQTTSNPacket_decode(curdata, buflen, &mylen)); /* read length */ + enddata = buf + mylen; + if (enddata - curdata > buflen) + goto exit; + + if (readChar(&curdata) != MQTTSN_ADVERTISE) + goto exit; + + *gatewayid = readChar(&curdata); + *duration = readInt(&curdata); + + rc = 1; +exit: + FUNC_EXIT_RC(rc); + return rc; +} + + + +/** + * Serializes the supplied searchgw data into the supplied buffer, ready for sending + * @param buf the buffer into which the packet will be serialized + * @param buflen the length in bytes of the supplied buffer + * @param radius the broadcast radius of this message + * @return the length of the serialized data. <= 0 indicates error + */ +int MQTTSNSerialize_searchgw(unsigned char* buf, int buflen, unsigned char radius) +{ + unsigned char *ptr = buf; + int len = 0; + int rc = 0; + + FUNC_ENTRY; + if ((len = MQTTSNPacket_len(2)) > buflen) + { + rc = MQTTSNPACKET_BUFFER_TOO_SHORT; + goto exit; + } + ptr += MQTTSNPacket_encode(ptr, len); /* write length */ + writeChar(&ptr, MQTTSN_SEARCHGW); /* write message type */ + + writeChar(&ptr, radius); + + rc = ptr - buf; +exit: + FUNC_EXIT_RC(rc); + return rc; + +} + + +/** + * Deserializes the supplied (wire) buffer into gwinfo data + * @param gatewayid the returned gateway id + * @param gatewayaddress_len the optional returned length of the gateway address (0 if none) + * @param gatewayaddress the optional returned gateway address (set to NULL if none) + * @param buf the raw buffer data, of the correct length determined by the remaining length field + * @param buflen the length in bytes of the data in the supplied buffer + * @return error code. 1 is success + */ +int MQTTSNDeserialize_gwinfo(unsigned char* gatewayid, unsigned short* gatewayaddress_len, + unsigned char** gatewayaddress, unsigned char* buf, int buflen) +{ + unsigned char* curdata = buf; + unsigned char* enddata = NULL; + int rc = 0; + int mylen = 0; + + FUNC_ENTRY; + curdata += (rc = MQTTSNPacket_decode(curdata, buflen, &mylen)); /* read length */ + enddata = buf + mylen; + if (enddata - curdata > buflen) + goto exit; + + if (readChar(&curdata) != MQTTSN_GWINFO) + goto exit; + + *gatewayid = readChar(&curdata); + + *gatewayaddress_len = enddata - curdata; + *gatewayaddress = (gatewayaddress_len > 0) ? curdata : NULL; + + rc = 1; +exit: + FUNC_EXIT_RC(rc); + return rc; +} + +