Diff: MQTTSNDeserializePublish.c

Revision:

0:c524a894b5e8

Child:

1:7fa362fa563f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MQTTSNDeserializePublish.c	Thu Feb 26 15:59:36 2015 +0000
@@ -0,0 +1,226 @@
+/*******************************************************************************
+ * 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 "MQTTSNPacket.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 MQTTSNString - 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 MQTTSNDeserialize_publish(unsigned char* dup, int* qos, unsigned char* retained, unsigned short* packetid, MQTTSN_topicid* topic,
+		unsigned char** payload, int* payloadlen, unsigned char* buf, int buflen)
+{
+	MQTTSNFlags flags;
+	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_PUBLISH)
+		goto exit;
+
+	flags.all = readChar(&curdata);
+	*dup = flags.bits.dup;
+	*qos = flags.bits.QoS;
+	*retained = flags.bits.retain;
+
+	topic->type = flags.bits.topicIdType;
+	if (topic->type == MQTTSN_TOPIC_TYPE_NORMAL && *qos == 3)
+	{
+		/* special arrangement for long topic names in QoS -1 publishes.  The length of the topic is in the topicid field */
+		topic->data.long_.len = readInt(&curdata);
+	}
+	else if (topic->type == MQTTSN_TOPIC_TYPE_NORMAL || topic->type == MQTTSN_TOPIC_TYPE_PREDEFINED)
+		topic->data.id = readInt(&curdata);
+	else
+	{
+		topic->data.short_name[0] = readChar(&curdata);
+		topic->data.short_name[1] = readChar(&curdata);
+	}
+	*packetid = readInt(&curdata);
+
+	if (topic->type == MQTTSN_TOPIC_TYPE_NORMAL && *qos == 3)
+	{
+		topic->data.long_.name = (char*)curdata;
+		curdata += topic->data.long_.len;
+	}
+
+	*payloadlen = enddata - curdata;
+	*payload = curdata;
+	rc = 1;
+exit:
+	FUNC_EXIT_RC(rc);
+	return rc;
+}
+
+
+int MQTTSNDeserialize_puback(unsigned short* topicid, unsigned short* packetid,
+		unsigned char* returncode, 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_PUBACK)
+		goto exit;
+
+	*topicid = readInt(&curdata);
+	*packetid = readInt(&curdata);
+	*returncode = readChar(&curdata);
+
+	rc = 1;
+exit:
+	FUNC_EXIT_RC(rc);
+	return rc;
+}
+
+
+/**
+  * Deserializes the supplied (wire) buffer into an ack
+  * @param packettype returned integer - the MQTT packet type
+  * @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 MQTTSNDeserialize_ack(unsigned char* type, unsigned short* packetid, 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;
+
+	*type = readChar(&curdata);
+	if (*type != MQTTSN_PUBREL && *type != MQTTSN_PUBREC && *type != MQTTSN_PUBCOMP)
+		goto exit;
+
+	*packetid = readInt(&curdata);
+
+	rc = 1;
+exit:
+	FUNC_EXIT_RC(rc);
+	return rc;
+}
+
+
+/**
+  * Deserializes the supplied (wire) buffer into register data
+  * @param topicid returned topic id
+  * @param packetid returned integer - the MQTT packet identifier
+  * @param topicName returned MQTTSNString - the MQTT topic in the register
+  * @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_register(unsigned short* topicid, unsigned short* packetid, MQTTSNString* topicname,
+		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_REGISTER)
+		goto exit;
+
+	*topicid = readInt(&curdata);
+	*packetid = readInt(&curdata);
+
+	topicname->lenstring.data = (char*)curdata;
+	topicname->lenstring.len = enddata - curdata;
+	topicname->cstring = NULL;
+
+	rc = 1;
+exit:
+	FUNC_EXIT_RC(rc);
+	return rc;
+}
+
+
+/**
+  * Deserializes the supplied (wire) buffer into register data
+  * @param topicid returned topic id
+  * @param packetid returned integer - the MQTT packet identifier
+  * @param return_code returned integer return code
+  * @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_regack(unsigned short* topicid, unsigned short* packetid, unsigned char* return_code,
+		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_REGACK)
+		goto exit;
+
+	*topicid = readInt(&curdata);
+	*packetid = readInt(&curdata);
+	*return_code = readChar(&curdata);
+
+	rc = 1;
+exit:
+	FUNC_EXIT_RC(rc);
+	return rc;
+}
+