mqtt_unsubscribe.hpp

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#pragma once

#include "mqtt_message.hpp"

namespace acl {

/**
 * mqtt message object for MQTT_UNSUBSCRIBE type.
 */
class ACL_CPP_API mqtt_unsubscribe : public mqtt_message {
public:
        /**
         * constructor for creating MQTT_PUBACK mqtt message object.
         * @see mqtt_message
         */
        mqtt_unsubscribe(void);

        /**
         * constructor for creating MQTT_PUBACK mqtt message object.
         * @see mqtt_message
         */
        mqtt_unsubscribe(const mqtt_header& header);

        ~mqtt_unsubscribe(void);

        /**
         * set the message id.
         * @param id {unsigned short} should > 0 && <= 65535.
         * @return {mqtt_unsubscribe&}
         */
        mqtt_unsubscribe& set_pkt_id(unsigned short id);

        /**
         * set the message's topic.
         * @param topic {const char*}
         * @return {mqtt_unsubscribe&}
         */
        mqtt_unsubscribe& add_topic(const char* topic);

protected:
        // @override
        bool to_string(string& out);

        // @override
        int update(const char* data, int dlen);

        // @override
        bool finished(void) const {
                return finished_;
        }

public:
        // used internal to parse unsubscribe message in streaming mode.

        int update_header_var(const char* data, int dlen);
        int update_topic_len(const char* data, int dlen);
        int update_topic_val(const char* data, int dlen);

private:
        unsigned status_;
        bool finished_;
        char buff_[2];
        unsigned dlen_;

        unsigned short  pkt_id_;
        std::vector<string> topics_;

        unsigned body_len_;
        unsigned nread_;

        string topic_;
};

} // namespace acl