123
MQTTSNDeserializePublish.c
- Committer:
- icraggs
- Date:
- 2016-01-06
- Revision:
- 1:7fa362fa563f
- Parent:
- 0:c524a894b5e8
File content as of revision 1:7fa362fa563f:
/******************************************************************************* * 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 (MQTTSNPacket_readChar(&curdata) != MQTTSN_PUBLISH) goto exit; flags.all = MQTTSNPacket_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 = MQTTSNPacket_readInt(&curdata); } else if (topic->type == MQTTSN_TOPIC_TYPE_NORMAL || topic->type == MQTTSN_TOPIC_TYPE_PREDEFINED) topic->data.id = MQTTSNPacket_readInt(&curdata); else { topic->data.short_name[0] = MQTTSNPacket_readChar(&curdata); topic->data.short_name[1] = MQTTSNPacket_readChar(&curdata); } *packetid = MQTTSNPacket_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 (MQTTSNPacket_readChar(&curdata) != MQTTSN_PUBACK) goto exit; *topicid = MQTTSNPacket_readInt(&curdata); *packetid = MQTTSNPacket_readInt(&curdata); *returncode = MQTTSNPacket_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 = MQTTSNPacket_readChar(&curdata); if (*type != MQTTSN_PUBREL && *type != MQTTSN_PUBREC && *type != MQTTSN_PUBCOMP) goto exit; *packetid = MQTTSNPacket_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 (MQTTSNPacket_readChar(&curdata) != MQTTSN_REGISTER) goto exit; *topicid = MQTTSNPacket_readInt(&curdata); *packetid = MQTTSNPacket_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 (MQTTSNPacket_readChar(&curdata) != MQTTSN_REGACK) goto exit; *topicid = MQTTSNPacket_readInt(&curdata); *packetid = MQTTSNPacket_readInt(&curdata); *return_code = MQTTSNPacket_readChar(&curdata); rc = 1; exit: FUNC_EXIT_RC(rc); return rc; }