initial commit

third_party/libhv/mqtt/mqtt_protocol.h

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+#ifndef HV_MQTT_PROTOCOL_H_
+#define HV_MQTT_PROTOCOL_H_
+
+#include "hexport.h"
+
+#define DEFAULT_MQTT_PORT   1883
+
+#define MQTT_PROTOCOL_V31   3
+#define MQTT_PROTOCOL_V311  4
+#define MQTT_PROTOCOL_V5    5 // Not yet supproted
+
+#define MQTT_PROTOCOL_NAME      "MQTT"
+#define MQTT_PROTOCOL_NAME_v31  "MQIsdp"
+
+/*
+ * connect flags
+ * 0        1               2       3-4         5           6           7
+ * reserved clean_session has_will will_qos will_retain has_password has_username
+ */
+#define MQTT_CONN_CLEAN_SESSION 0x02
+#define MQTT_CONN_HAS_WILL      0x04
+#define MQTT_CONN_WILL_RETAIN   0x20
+#define MQTT_CONN_HAS_PASSWORD  0x40
+#define MQTT_CONN_HAS_USERNAME  0x80
+
+typedef enum {
+    MQTT_TYPE_CONNECT       = 1,
+    MQTT_TYPE_CONNACK       = 2,
+    MQTT_TYPE_PUBLISH       = 3,
+    MQTT_TYPE_PUBACK        = 4,
+    MQTT_TYPE_PUBREC        = 5,
+    MQTT_TYPE_PUBREL        = 6,
+    MQTT_TYPE_PUBCOMP       = 7,
+    MQTT_TYPE_SUBSCRIBE     = 8,
+    MQTT_TYPE_SUBACK        = 9,
+    MQTT_TYPE_UNSUBSCRIBE   = 10,
+    MQTT_TYPE_UNSUBACK      = 11,
+    MQTT_TYPE_PINGREQ       = 12,
+    MQTT_TYPE_PINGRESP      = 13,
+    MQTT_TYPE_DISCONNECT    = 14,
+} mqtt_type_e;
+
+typedef enum {
+    MQTT_CONNACK_ACCEPTED                       = 0,
+    MQTT_CONNACK_REFUSED_PROTOCOL_VERSION       = 1,
+    MQTT_CONNACK_REFUSED_IDENTIFIER_REJECTED    = 2,
+    MQTT_CONNACK_REFUSED_SERVER_UNAVAILABLE     = 3,
+    MQTT_CONNACK_REFUSED_BAD_USERNAME_PASSWORD  = 4,
+    MQTT_CONNACK_REFUSED_NOT_AUTHORIZED         = 5,
+} mqtt_connack_e;
+
+typedef struct mqtt_head_s {
+    unsigned char type:     4;
+    unsigned char dup:      1;
+    unsigned char qos:      2;
+    unsigned char retain:   1;
+    unsigned int  length;
+} mqtt_head_t;
+
+typedef struct mqtt_message_s {
+    unsigned int    topic_len;
+    const char*     topic;
+    unsigned int    payload_len;
+    const char*     payload;
+    unsigned char   qos;
+    unsigned char   retain;
+} mqtt_message_t;
+
+BEGIN_EXTERN_C
+
+#define DEFAULT_MQTT_PACKAGE_MAX_LENGTH (1 << 28)   // 256M
+HV_INLINE int mqtt_estimate_length(mqtt_head_t* head) {
+    // 28 bits => 4*7 bits varint
+    return 1 + 4 + head->length;
+}
+
+HV_EXPORT int mqtt_head_pack(mqtt_head_t* head, unsigned char buf[]);
+HV_EXPORT int mqtt_head_unpack(mqtt_head_t* head, const unsigned char* buf, int len);
+
+END_EXTERN_C
+
+#endif // HV_MQTT_PROTOCOL_H_