Diff: MQTT/MQTTPacket/MQTTUnsubscribeServer.c

Revision:

6:37b6d0d56190

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MQTT/MQTTPacket/MQTTUnsubscribeServer.c	Wed Aug 20 12:45:14 2014 +0000
@@ -0,0 +1,102 @@
+/*******************************************************************************
+ * 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 "MQTTPacket.h"
+#include "StackTrace.h"
+
+#include <string.h>
+
+
+/**
+  * Deserializes the supplied (wire) buffer into unsubscribe data
+  * @param dup integer returned - the MQTT dup flag
+  * @param packetid integer returned - the MQTT packet identifier
+  * @param maxcount - the maximum number of members allowed in the topicFilters and requestedQoSs arrays
+  * @param count - number of members in the topicFilters and requestedQoSs arrays
+  * @param topicFilters - array of topic filter names
+  * @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 the length of the serialized data.  <= 0 indicates error
+  */
+int MQTTDeserialize_unsubscribe(unsigned char* dup, unsigned short* packetid, int maxcount, int* count, MQTTString topicFilters[],
+		unsigned char* buf, int len)
+{
+	MQTTHeader header = {0};
+	unsigned char* curdata = buf;
+	unsigned char* enddata = NULL;
+	int rc = 0;
+	int mylen = 0;
+
+	FUNC_ENTRY;
+	header.byte = readChar(&curdata);
+	if (header.bits.type != UNSUBSCRIBE)
+		goto exit;
+	*dup = header.bits.dup;
+
+	curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
+	enddata = curdata + mylen;
+
+	*packetid = readInt(&curdata);
+
+	*count = 0;
+	while (curdata < enddata)
+	{
+		if (!readMQTTLenString(&topicFilters[*count], &curdata, enddata))
+			goto exit;
+		(*count)++;
+	}
+
+	rc = 1;
+exit:
+	FUNC_EXIT_RC(rc);
+	return rc;
+}
+
+
+/**
+  * Serializes the supplied unsuback 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 packetid integer - the MQTT packet identifier
+  * @return the length of the serialized data.  <= 0 indicates error
+  */
+int MQTTSerialize_unsuback(unsigned char* buf, int buflen, unsigned short packetid)
+{
+	MQTTHeader header = {0};
+	int rc = 0;
+	unsigned char *ptr = buf;
+
+	FUNC_ENTRY;
+	if (buflen < 2)
+	{
+		rc = MQTTPACKET_BUFFER_TOO_SHORT;
+		goto exit;
+	}
+	header.byte = 0;
+	header.bits.type = UNSUBACK;
+	writeChar(&ptr, header.byte); /* write header */
+
+	ptr += MQTTPacket_encode(ptr, 2); /* write remaining length */
+
+	writeInt(&ptr, packetid);
+
+	rc = ptr - buf;
+exit:
+	FUNC_EXIT_RC(rc);
+	return rc;
+}
+
+