Diff: MQTTDeserializePublish.c

Revision:

0:7734401cc1b4

Child:

12:cd99ac9cb25a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MQTTDeserializePublish.c	Tue Feb 04 22:31:32 2014 +0000
@@ -0,0 +1,105 @@
+/*******************************************************************************
+ * 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 "StackTrace.h"
+#include "MQTTPacket.h"
+#include <string.h>
+
+#define min(a, b) ((a < b) ? 1 : 0)
+
+/**
+  * Deserializes the supplied (wire) buffer into publish data
+  * @param dup returned integer - the MQTT dup flag
+  * @param qos returned integer - the MQTT QoS value
+  * @param retained returned integer - the MQTT retained flag
+  * @param packetid returned integer - the MQTT packet identifier
+  * @param topicName returned MQTTString - the MQTT topic in the publish
+  * @param payload returned byte buffer - the MQTT publish payload
+  * @param payloadlen returned integer - the length of the MQTT payload
+  * @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 MQTTDeserialize_publish(int* dup, int* qos, int* retained, int* packetid, MQTTString* topicName,
+		char** payload, int* payloadlen, char* buf, int buflen)
+{
+	MQTTHeader header;
+	char* curdata = buf;
+	char* enddata = NULL;
+	int rc = 0;
+	int mylen = 0;
+
+	FUNC_ENTRY;
+	header.byte = readChar(&curdata);
+	*dup = header.bits.dup;
+	*qos = header.bits.qos;
+	*retained = header.bits.retain;
+
+	curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
+	enddata = curdata + mylen;
+
+	if (!readMQTTLenString(topicName, &curdata, enddata) ||
+		enddata - curdata < 0) /* do we have enough data to read the protocol version byte? */
+		goto exit;
+
+	if (*qos > 0)
+		*packetid = readInt(&curdata);
+
+	*payloadlen = enddata - curdata;
+	*payload = curdata;
+	rc = 1;
+exit:
+	FUNC_EXIT_RC(rc);
+	return rc;
+}
+
+
+
+/**
+  * Deserializes the supplied (wire) buffer into an ack
+  * @param type returned integer - the MQTT packet type
+  * @param dup returned integer - the MQTT dup flag
+  * @param packetid returned integer - the MQTT packet identifier
+  * @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, 0 is failure
+  */
+int MQTTDeserialize_ack(int* type, int* dup, int* packetid, char* buf, int buflen)
+{
+	MQTTHeader header;
+	char* curdata = buf;
+	char* enddata = NULL;
+	int rc = 0;
+	int mylen;
+
+	FUNC_ENTRY;
+	header.byte = readChar(&curdata);
+	*dup = header.bits.dup;
+	*type = header.bits.type;
+
+	curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
+	enddata = curdata + mylen;
+
+	if (enddata - curdata < 2)
+		goto exit;
+	*packetid = readInt(&curdata);
+
+	rc = 1;
+exit:
+	FUNC_EXIT_RC(rc);
+	return rc;
+}
+