143 lines
4.8 KiB
C
143 lines
4.8 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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#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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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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MQTT_CPT_RESERVED = 0, CONNECT = 1, CONNACK, PUBLISH, PUBACK, PUBREC, PUBREL,
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PUBCOMP, SUBSCRIBE, SUBACK, UNSUBSCRIBE, UNSUBACK,
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PINGREQ, PINGRESP, DISCONNECT
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};
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//add by tcq
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#define MQTT_HEADER_BIT_MASK_TYPE (0xF0)
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#define MQTT_HEADER_BIT_MASK_DUP (0x08)
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#define MQTT_HEADER_BIT_MASK_QOS (0x06)
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#define MQTT_HEADER_BIT_MASK_RETAIN (0x01)
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#define MQTT_HEADER_GET_TYPE(head) ((head & 0xF0) >> 4)
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#define MQTT_HEADER_GET_DUP(head) ((head & 0x08) >> 3)
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#define MQTT_HEADER_GET_QOS(head) ((head & 0x06) >> 1)
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#define MQTT_HEADER_GET_RETAIN(head) (head & 0x01)
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#define MQTT_HEADER_SET_TYPE(head, type) do {head |= ((type << 4) & 0xF0); } while (0)
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#define MQTT_HEADER_SET_DUP(head, dup) do {head |= ((dup << 3) & 0x08); } while (0)
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#define MQTT_HEADER_SET_QOS(head, qos) do {head |= ((qos << 1) & 0x06); } while (0)
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#define MQTT_HEADER_SET_RETAIN(head, retain) do {head |= (retain & 0x01); } while (0)
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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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unsigned char byte; /**< the whole byte */
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#if defined(REVERSED)
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struct {
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unsigned int type : 4; /**< message type nibble */
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unsigned int dup : 1; /**< DUP flag bit */
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unsigned int qos : 2; /**< QoS value, 0, 1 or 2 */
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unsigned int retain : 1; /**< retained flag bit */
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} bits;
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#else
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struct {
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unsigned int retain : 1; /**< retained flag bit */
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unsigned int qos : 2; /**< QoS value, 0, 1 or 2 */
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unsigned int dup : 1; /**< DUP flag bit */
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unsigned int 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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int len;
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char *data;
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} MQTTLenString;
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typedef struct {
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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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int 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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int MQTTSerialize_ack(unsigned char *buf, int buflen, unsigned char type, unsigned char dup, unsigned short packetid);
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int MQTTDeserialize_ack(unsigned char *packettype, unsigned char *dup, unsigned short *packetid, unsigned char *buf, int buflen);
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int MQTTPacket_len(int rem_len);
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int MQTTPacket_equals(MQTTString *a, char *b);
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int MQTTPacket_encode(unsigned char *buf, int length);
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int MQTTPacket_decode(int (*getcharfn)(unsigned char *, int), int *value);
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int MQTTPacket_decodeBuf(unsigned char *buf, int *value);
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int readInt(unsigned char **pptr);
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char readChar(unsigned char **pptr);
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void writeChar(unsigned char **pptr, char c);
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void writeInt(unsigned char **pptr, int anInt);
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int readMQTTLenString(MQTTString *mqttstring, unsigned char **pptr, unsigned char *enddata);
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void writeCString(unsigned char **pptr, const char *string);
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void writeMQTTString(unsigned char **pptr, MQTTString mqttstring);
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DLLExport int MQTTPacket_read(unsigned char *buf, int buflen, int (*getfn)(unsigned char *, int));
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typedef struct {
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int (*getfn)(void *, unsigned char *, int); /* 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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int multiplier;
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int rem_len;
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int len;
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char state;
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} MQTTTransport;
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int MQTTPacket_readnb(unsigned char *buf, int 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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