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;
+}
+
+