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137 lines
3.8 KiB
C
137 lines
3.8 KiB
C
/*
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* Copyright (c) 2014 IBM Corp.
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*
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* and Eclipse Distribution License v1.0 which accompany this distribution.
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*
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* The Eclipse Public License is available at
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* http://www.eclipse.org/legal/epl-v10.html
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* and the Eclipse Distribution License is available at
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* http://www.eclipse.org/org/documents/edl-v10.php.
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*
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* Contributors:
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* Ian Craggs - initial API and implementation and/or initial documentation
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* Xiang Rong - 442039 Add makefile to Embedded C client
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*******************************************************************************/
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#ifndef MQTTPACKET_H_
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#define MQTTPACKET_H_
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#include <stdint.h>
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#if defined(__cplusplus) /* If this is a C++ compiler, use C linkage */
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extern "C" {
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#endif
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#if defined(WIN32_DLL) || defined(WIN64_DLL)
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#define DLLImport __declspec(dllimport)
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#define DLLExport __declspec(dllexport)
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#elif defined(LINUX_SO)
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#define DLLImport extern
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#define DLLExport __attribute__ ((visibility ("default")))
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#else
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#define DLLImport
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#define DLLExport
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#endif
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enum errors
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{
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MQTTPACKET_BUFFER_TOO_SHORT = -2,
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MQTTPACKET_READ_ERROR = -1,
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MQTTPACKET_READ_COMPLETE
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};
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enum msgTypes
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{
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CONNECT = 1, CONNACK, PUBLISH, PUBACK, PUBREC, PUBREL, PUBCOMP, SUBSCRIBE,
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SUBACK, UNSUBSCRIBE, UNSUBACK, PINGREQ, PINGRESP, DISCONNECT
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};
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/**
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* Bitfields for the MQTT header byte.
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*/
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typedef union
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{
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uint8_t byte; /**< the whole byte */
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#if defined(REVERSED)
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struct
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{
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uint8_t type : 4; /**< message type nibble */
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uint8_t dup : 1; /**< DUP flag bit */
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uint8_t qos : 2; /**< QoS value, 0, 1 or 2 */
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uint8_t retain : 1; /**< retained flag bit */
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} bits;
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#else
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struct
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{
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uint8_t retain : 1; /**< retained flag bit */
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uint8_t qos : 2; /**< QoS value, 0, 1 or 2 */
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uint8_t dup : 1; /**< DUP flag bit */
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uint8_t type : 4; /**< message type nibble */
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} bits;
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#endif
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} MQTTHeader;
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typedef struct
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{
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int32_t len;
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char* data;
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} MQTTLenString;
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typedef struct
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{
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char* cstring;
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MQTTLenString lenstring;
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} MQTTString;
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#define MQTTString_initializer {NULL, {0, NULL}}
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int32_t MQTTstrlen(MQTTString mqttstring);
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#include "MQTTConnect.h"
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#include "MQTTPublish.h"
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#include "MQTTSubscribe.h"
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#include "MQTTUnsubscribe.h"
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#include "MQTTFormat.h"
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int32_t MQTTSerialize_ack(uint8_t* buf, int32_t buflen, uint8_t type, uint8_t dup, uint16_t packetid);
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int32_t MQTTDeserialize_ack(uint8_t* packettype, uint8_t* dup, uint16_t* packetid, uint8_t* buf, int32_t buflen);
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int32_t MQTTPacket_len(int32_t rem_len);
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int32_t MQTTPacket_equals(MQTTString* a, char* b);
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int32_t MQTTPacket_encode(uint8_t* buf, int32_t length);
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int32_t MQTTPacket_decode(int32_t (*getcharfn)(uint8_t*, int32_t), int32_t* value);
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int32_t MQTTPacket_decodeBuf(uint8_t* buf, int32_t* value);
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int32_t readInt(uint8_t** pptr);
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char readChar(uint8_t** pptr);
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void writeChar(uint8_t** pptr, char c);
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void writeInt(uint8_t** pptr, int32_t anInt);
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int32_t readMQTTLenString(MQTTString* mqttstring, uint8_t** pptr, uint8_t* enddata);
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void writeCString(uint8_t** pptr, const char* string);
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void writeMQTTString(uint8_t** pptr, MQTTString mqttstring);
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DLLExport int32_t MQTTPacket_read(uint8_t* buf, int32_t buflen, int32_t (*getfn)(uint8_t*, int32_t));
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typedef struct
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{
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int32_t (*getfn)(void *, uint8_t*, int32_t); /* must return -1 for error, 0 for call again, or the number of bytes read */
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void *sck; /* pointer to whatever the system may use to identify the transport */
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int32_t multiplier;
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int32_t rem_len;
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int32_t len;
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char state;
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}MQTTTransport;
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int32_t MQTTPacket_readnb(uint8_t* buf, int32_t buflen, MQTTTransport *trp);
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#ifdef __cplusplus /* If this is a C++ compiler, use C linkage */
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}
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#endif
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#endif /* MQTTPACKET_H_ */
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